diff options
| -rw-r--r-- | .gitignore | 3 | ||||
| -rw-r--r-- | CMakeLists.txt | 1 | ||||
| -rw-r--r-- | jsapi/js-hello.js | 28 | ||||
| -rw-r--r-- | src/CMakeLists.txt | 2 | ||||
| -rw-r--r-- | src/afb-api-js.c | 388 | ||||
| -rw-r--r-- | src/afb-api-js.h | 26 | ||||
| -rw-r--r-- | src/afb-args.c | 4 | ||||
| -rw-r--r-- | src/duk_config.h | 3662 | ||||
| -rw-r--r-- | src/duktape.c | 96801 | ||||
| -rw-r--r-- | src/duktape.h | 1419 | ||||
| -rw-r--r-- | src/main-afb-daemon.c | 2 |
11 files changed, 102334 insertions, 2 deletions
@@ -7,12 +7,11 @@ dist/* .dep.inc CMakeFiles/ CMakeCache.txt -nbproject/private/* cmake_install.cmake .vscode stress-out* node_modules/ _book/ *.kdev4 -nbproject/* +nbproject/ doxygen-output diff --git a/CMakeLists.txt b/CMakeLists.txt index 75a50dcf..299487cd 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -155,6 +155,7 @@ SET(link_libraries ${LIBMAGIC_LDFLAGS} -ldl -lrt + -lm ) ADD_SUBDIRECTORY(src/devtools) diff --git a/jsapi/js-hello.js b/jsapi/js-hello.js new file mode 100644 index 00000000..c6c41dfc --- /dev/null +++ b/jsapi/js-hello.js @@ -0,0 +1,28 @@ +var counter = 0; + +exports.ping = function(req, args) { + + afb_req_success(req, args, String(++counter)); +}; + +exports.fail = function(req, args) { + + afb_req_fail(req, "fail", String(++counter)); +}; + +exports.subcall = function(req, args) { + + if (!args.api || !args.verb) + afb_req_fail(req, "bad-args", String(++counter)); + else { + var x = afb_req_subcall_sync(req, args.api, args.verb, args.args); + if (!x) + afb_req_fail(req, "null-answer", String(++counter)); + else if (x.request.status == "success") + afb_req_success(req, x.response, String(++counter)); + else + afb_req_fail(req, x.request.status, String(++counter)); + } +}; + + diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt index 0d5e7122..afc7031f 100644 --- a/src/CMakeLists.txt +++ b/src/CMakeLists.txt @@ -72,6 +72,7 @@ add_definitions( SET(AFB_LIB_SOURCES afb-api.c afb-api-dbus.c + afb-api-js.c afb-api-so.c afb-api-so-v1.c afb-api-so-v2.c @@ -129,6 +130,7 @@ SET(AFB_LIB_SOURCES watchdog.c websock.c wrap-json.c + duktape.c ) ADD_LIBRARY(afb-lib STATIC ${AFB_LIB_SOURCES}) diff --git a/src/afb-api-js.c b/src/afb-api-js.c new file mode 100644 index 00000000..67532aa0 --- /dev/null +++ b/src/afb-api-js.c @@ -0,0 +1,388 @@ +/* + * Copyright (C) 2016, 2017 "IoT.bzh" + * Author José Bollo <jose.bollo@iot.bzh> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define _GNU_SOURCE + +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <json-c/json.h> +#include "duktape.h" + +#include "afb-common.h" +#include "afb-api.h" +#include "afb-apiset.h" +#include "afb-api-js.h" +#include "afb-xreq.h" +#include "jobs.h" +#include "verbose.h" + +/********************************************************************/ +struct jsapi +{ + int logmask; + duk_context *context; + char api[1]; +}; + +/********************************************************************/ +static void jsapi_call(void *closure, struct afb_xreq *xreq); +static int jsapi_service_start(void *closure); +static int jsapi_get_logmask(void *closure); +static void jsapi_set_logmask(void *closure, int level); +static struct json_object *jsapi_describe(void *closure); + +static struct afb_api_itf jsapi_itf = +{ + .call = jsapi_call, + .service_start = jsapi_service_start, + .set_logmask = jsapi_set_logmask, + .get_logmask = jsapi_get_logmask, + .describe = jsapi_describe +}; + +/********************************************************************/ +static duk_ret_t do_success(duk_context *ctx); +static duk_ret_t do_fail(duk_context *ctx); +static duk_ret_t do_subcall_sync(duk_context *ctx); +static duk_ret_t do_error(duk_context *ctx); +static duk_ret_t do_require(duk_context *ctx); + +static const duk_function_list_entry funcs[] = +{ + { "afb_req_success", do_success, 3 }, + { "afb_req_fail", do_fail, 3 }, + { "afb_req_subcall_sync", do_subcall_sync, 4 }, + { "afb_error", do_error, 1 }, + { "require", do_require, 1 }, + { NULL, NULL, 0 } +}; + +/********************************************************************/ + +static void on_heap_fatal(void *udata, const char *msg) +{ + ERROR("Got fatal from duktape: %s", msg); + abort(); +} + +static int jsapi_load(duk_context *ctx, const char *path) +{ + static const char prefix[] = "function(exports){"; + static const char suffix[] = "}"; + + int fd, rc; + struct stat st; + char *buffer; + ssize_t s; + + fd = afb_common_rootdir_open_locale(path, O_RDONLY, NULL); + if (fd < 0) { + fd = open(path, O_RDONLY); + if (fd < 0) { + ERROR("Can't open %s: %m", path); + duk_push_error_object(ctx, DUK_ERR_ERROR, "Can't open file %s: %m", path); + goto error; + } + } + + rc = fstat(fd, &st); + if (rc < 0) { + goto error2; + } + + buffer = alloca(st.st_size + sizeof prefix + sizeof suffix); + s = read(fd, &buffer[sizeof prefix - 1], st.st_size); + if (s < 0) + goto error2; + if (s != st.st_size) + goto error2; + + memcpy(buffer, prefix, sizeof prefix - 1); + memcpy(&buffer[sizeof prefix - 1 + st.st_size], suffix, sizeof suffix); + close(fd); + + duk_push_object(ctx); /* exports */ + duk_push_string(ctx, path); /* exports path */ + rc = duk_pcompile_string_filename(ctx, DUK_COMPILE_FUNCTION|DUK_COMPILE_STRICT, buffer); /* exports func */ + if (rc) { + duk_dup_top(ctx); /* exports error error */ + ERROR("compiling of %s failed: %s", path, duk_safe_to_string(ctx, -1)); /* exports error error */ + duk_pop(ctx); /* exports error */ + duk_replace(ctx, -2); /* error */ + goto error; + } + duk_dup(ctx, -2); /* exports func exports */ + rc = duk_pcall(ctx, 1); /* exports ret */ + if (rc) { + duk_dup_top(ctx); /* exports error error */ + if (!duk_is_error(ctx, -1)) { + duk_push_error_object(ctx, DUK_ERR_ERROR, "%s", duk_safe_to_string(ctx, -1)); /* exports error error error */ + duk_replace(ctx, -3); /* exports error error */ + } + ERROR("initialisation of %s failed: %s", path, duk_safe_to_string(ctx, -1)); /* exports error */ + duk_pop(ctx); /* exports error */ + duk_replace(ctx, -2); /* error */ + goto error; + } + duk_pop(ctx); /* exports */ + return 1; +error2: + ERROR("can't process file %s: %m", path); + duk_push_error_object(ctx, DUK_ERR_ERROR, "Can't process file %s: %m", path); + close(fd); +error: + return duk_throw(ctx); +} + +static duk_ret_t do_require(duk_context *ctx) +{ + int rc; + const char *path; + + path = duk_require_string(ctx, -1); /* path */ + duk_push_global_stash(ctx); /* path gstash */ + duk_dup(ctx, -2); /* path gstash path */ + rc = duk_get_prop(ctx, -2); /* path gstash ? */ + if (!rc) { + /* path gstash error (ELSE: path gstash exports) */ + duk_pop(ctx); /* path gstash */ + rc = jsapi_load(ctx, path); /* path gstash ? */ + if (rc > 0) { + /* path gstash exports (ELSE: path gstash error) */ + duk_dup_top(ctx); /* path gstash exports exports */ + duk_swap(ctx, -2, -4); /* exports gstash path exports */ + duk_put_prop(ctx, -3); /* exports gstash */ + duk_pop(ctx); /* exports */ + } + } + return 1; +} + +static void jsapi_destroy(struct jsapi *jsapi) +{ + duk_destroy_heap(jsapi->context); + free(jsapi); +} + +static struct jsapi *jsapi_create(const char *path) +{ + struct jsapi *jsapi; + duk_context *ctx; + const char *api, *ext; + + /* allocate and initialise names */ + api = strrchr(path, '/'); + api = api ? api + 1 : path; + ext = strrchr(api, '.') ?: &api[strlen(api)]; + jsapi = malloc(sizeof *jsapi + 1 + (ext - api)); + if (!jsapi) + goto error; + memcpy(jsapi->api, api, ext - api); + jsapi->api[ext - api] = 0; + jsapi->logmask = logmask; + + /* create the duktape context */ + ctx = duk_create_heap(NULL, NULL, NULL, NULL, on_heap_fatal); + if (!ctx) + goto error; + + jsapi->context = ctx; + + /* populate global with functions */ + duk_push_global_object(ctx); + duk_put_function_list(ctx, -1, funcs); + duk_pop(ctx); + + /* call the require path */ + ctx = jsapi->context; + duk_get_global_string(ctx, "require"); + duk_push_string(ctx, path); + duk_pcall(ctx, 1); + if (duk_is_error(ctx, -1)) { + const char *message, *file, *stack; + int line; + duk_get_prop_string(ctx, -1, "message"); + message = duk_get_string(ctx, -1); + duk_get_prop_string(ctx, -2, "fileName"); + file = duk_get_string(ctx, -1); + duk_get_prop_string(ctx, -3, "lineNumber"); + line = (int)duk_get_int(ctx, -1); + duk_get_prop_string(ctx, -4, "stack"); + stack = duk_get_string(ctx, -1); + ERROR("Initialisation of API %s from jsapi %s failed file %s (file %s, line %d) stack:\n%s\n", jsapi->api, path, message, file, line, stack); + jsapi_destroy(jsapi); + return NULL; + } + duk_put_global_string(ctx, "exports"); + return jsapi; + +error: + ERROR("out of memory"); + free(jsapi); + errno = ENOMEM; + return NULL; +} + +int afb_api_js_add(const char *path, struct afb_apiset *declare_set, struct afb_apiset* call_set) +{ + int rc; + struct jsapi *jsapi; + struct afb_api_item api; + + jsapi = jsapi_create(path); + if (!jsapi) + goto error; + + api.closure = jsapi; + api.itf = &jsapi_itf; + api.group = jsapi; + rc = afb_apiset_add(declare_set, jsapi->api, api); + if (!rc) + return 0; + + duk_destroy_heap(jsapi->context); + free(jsapi); +error: + return -1; +} + +/********************************************************************/ + +static duk_ret_t do_success(duk_context *ctx) +{ + struct afb_xreq *xreq; + const char *json, *info; + + xreq = duk_get_pointer(ctx, -3); + duk_json_encode(ctx, -2); + json = duk_get_string(ctx, -2); + info = duk_get_string(ctx, -1); + + afb_xreq_reply(xreq, json ? json_tokener_parse(json) : NULL, NULL, info); + return 0; +} + +static duk_ret_t do_fail(duk_context *ctx) +{ + struct afb_xreq *xreq; + const char *status, *info; + + xreq = duk_get_pointer(ctx, -3); + status = duk_get_string(ctx, -2); + info = duk_get_string(ctx, -1); + + afb_xreq_reply(xreq, NULL, status ?: "error", info); + return 0; +} + +static duk_ret_t do_subcall_sync(duk_context *ctx) +{ + int rc; + struct afb_xreq *xreq; + const char *api, *verb, *json; + struct json_object *resu; + + xreq = duk_get_pointer(ctx, -4); + api = duk_get_string(ctx, -3); + verb = duk_get_string(ctx, -2); + duk_json_decode(ctx, -1); + json = duk_get_string(ctx, -1); + + resu = NULL; + rc = afb_xreq_legacy_subcall_sync(xreq, api, verb, json ? json_tokener_parse(json) : NULL, &resu); + if (rc) + duk_push_null(ctx); + else { + duk_push_string(ctx, json_object_to_json_string(resu)); + duk_json_decode(ctx, -1); + } + json_object_put(resu); + return 1; +} + +static duk_ret_t do_error(duk_context *ctx) +{ + const char *message; + + message = duk_get_string(ctx, -1); + + ERROR("%s", message ? : "null"); + return 0; +} + +/********************************************************************/ + +static void jsapi_call(void *closure, struct afb_xreq *xreq) +{ + duk_idx_t top; + duk_context *ctx; + json_object *args; + const char *json; + struct jsapi *jsapi = closure; + + ctx = jsapi->context; + top = duk_get_top(ctx); + duk_get_global_string(ctx, "exports"); + if (!duk_is_object(ctx, -1)) { + afb_xreq_reply(xreq, NULL, "internal-error", "no exports!?"); + goto end; + } + duk_get_prop_string(ctx, -1, xreq->request.called_verb); + if (!duk_is_function(ctx, -1)) { + afb_xreq_reply_unknown_verb(xreq); + goto end; + } + duk_push_pointer(ctx, xreq); + args = afb_xreq_json(xreq); + json = json_object_to_json_string(args); + duk_push_string(ctx, json); + duk_json_decode(ctx, -1); + duk_pcall(ctx, 2); +end: + duk_pop_n(ctx, duk_get_top(ctx) - top); +} + +static int jsapi_service_start(void *closure) +{ + struct jsapi *jsapi = closure; + return 0; +} + +static int jsapi_get_logmask(void *closure) +{ + struct jsapi *jsapi = closure; + return jsapi->logmask; +} + +static void jsapi_set_logmask(void *closure, int level) +{ + struct jsapi *jsapi = closure; + jsapi->logmask = level; +} + +static struct json_object *jsapi_describe(void *closure) +{ + struct jsapi *jsapi = closure; + return NULL; +} + diff --git a/src/afb-api-js.h b/src/afb-api-js.h new file mode 100644 index 00000000..8ea450d5 --- /dev/null +++ b/src/afb-api-js.h @@ -0,0 +1,26 @@ +/* + * Copyright (C) 2016, 2017 "IoT.bzh" + * Author: José Bollo <jose.bollo@iot.bzh> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + + +#pragma once + +struct afb_apiset; + +extern int afb_api_js_add(const char *path, struct afb_apiset *declare_set, struct afb_apiset* call_set); + + + diff --git a/src/afb-args.c b/src/afb-args.c index 50bdc979..8f9e42cb 100644 --- a/src/afb-args.c +++ b/src/afb-args.c @@ -126,6 +126,7 @@ #define SET_NAME 'n' #define SET_OUTPUT 'o' #define SET_PORT 'p' +#define JS_API 'j' #define SET_QUIET 'q' #define SET_RANDOM_TOKEN 'r' #define ADD_SET 's' @@ -183,6 +184,8 @@ static struct option_desc optdefs[] = { {ADD_WEAK_LDPATH, 1, "weak-ldpaths","Same as --ldpaths but ignore errors"}, {SET_NO_LDPATH, 0, "no-ldpaths", "Discard default ldpaths loading"}, #endif + {JS_API, 1, "jsapi", "Load the javascript api of path"}, + {SET_TOKEN, 1, "token", "Initial Secret [default=random, use --token="" to allow any token]"}, {SET_RANDOM_TOKEN, 0, "random-token","Enforce a random token"}, @@ -841,6 +844,7 @@ static void parse_arguments_inner(int argc, char **argv, struct json_object *con case ADD_WS_CLIENT: case ADD_WS_SERVICE: case ADD_AUTO_API: + case JS_API: config_add_optstr(config, optid); break; diff --git a/src/duk_config.h b/src/duk_config.h new file mode 100644 index 00000000..141414ab --- /dev/null +++ b/src/duk_config.h @@ -0,0 +1,3662 @@ +/* + * duk_config.h configuration header generated by genconfig.py. + * + * Git commit: d7fdb67f18561a50e06bafd196c6b423af9ad6fe + * Git describe: v2.3.0 + * Git branch: master + * + * Supported platforms: + * - Mac OSX, iPhone, Darwin + * - Orbis + * - OpenBSD + * - Generic BSD + * - Atari ST TOS + * - AmigaOS + * - Durango (XboxOne) + * - Windows + * - Flashplayer (Crossbridge) + * - QNX + * - TI-Nspire + * - Emscripten + * - Linux + * - Solaris + * - AIX + * - HPUX + * - Generic POSIX + * - Cygwin + * - Generic UNIX + * - Generic fallback + * + * Supported architectures: + * - x86 + * - x64 + * - x32 + * - ARM 32-bit + * - ARM 64-bit + * - MIPS 32-bit + * - MIPS 64-bit + * - PowerPC 32-bit + * - PowerPC 64-bit + * - SPARC 32-bit + * - SPARC 64-bit + * - SuperH + * - Motorola 68k + * - Emscripten + * - Generic + * + * Supported compilers: + * - Clang + * - GCC + * - MSVC + * - Emscripten + * - TinyC + * - VBCC + * - Bruce's C compiler + * - Generic + * + */ + +#if !defined(DUK_CONFIG_H_INCLUDED) +#define DUK_CONFIG_H_INCLUDED + +/* + * Intermediate helper defines + */ + +/* DLL build detection */ +/* not configured for DLL build */ +#undef DUK_F_DLL_BUILD + +/* Apple OSX, iOS */ +#if defined(__APPLE__) +#define DUK_F_APPLE +#endif + +/* FreeBSD */ +#if defined(__FreeBSD__) || defined(__FreeBSD) +#define DUK_F_FREEBSD +#endif + +/* Orbis (PS4) variant */ +#if defined(DUK_F_FREEBSD) && defined(__ORBIS__) +#define DUK_F_ORBIS +#endif + +/* OpenBSD */ +#if defined(__OpenBSD__) || defined(__OpenBSD) +#define DUK_F_OPENBSD +#endif + +/* NetBSD */ +#if defined(__NetBSD__) || defined(__NetBSD) +#define DUK_F_NETBSD +#endif + +/* BSD variant */ +#if defined(DUK_F_FREEBSD) || defined(DUK_F_NETBSD) || defined(DUK_F_OPENBSD) || \ + defined(__bsdi__) || defined(__DragonFly__) +#define DUK_F_BSD +#endif + +/* Atari ST TOS. __TOS__ defined by PureC. No platform define in VBCC + * apparently, so to use with VBCC user must define __TOS__ manually. + */ +#if defined(__TOS__) +#define DUK_F_TOS +#endif + +/* Motorola 68K. Not defined by VBCC, so user must define one of these + * manually when using VBCC. + */ +#if defined(__m68k__) || defined(M68000) || defined(__MC68K__) +#define DUK_F_M68K +#endif + +/* AmigaOS. Neither AMIGA nor __amigaos__ is defined on VBCC, so user must + * define 'AMIGA' manually when using VBCC. + */ +#if defined(AMIGA) || defined(__amigaos__) +#define DUK_F_AMIGAOS +#endif + +/* PowerPC */ +#if defined(__powerpc) || defined(__powerpc__) || defined(__PPC__) +#define DUK_F_PPC +#if defined(__PPC64__) || defined(__LP64__) || defined(_LP64) +#define DUK_F_PPC64 +#else +#define DUK_F_PPC32 +#endif +#endif + +/* Durango (Xbox One) */ +#if defined(_DURANGO) || defined(_XBOX_ONE) +#define DUK_F_DURANGO +#endif + +/* Windows, both 32-bit and 64-bit */ +#if defined(_WIN32) || defined(WIN32) || defined(_WIN64) || defined(WIN64) || \ + defined(__WIN32__) || defined(__TOS_WIN__) || defined(__WINDOWS__) +#define DUK_F_WINDOWS +#if defined(_WIN64) || defined(WIN64) +#define DUK_F_WIN64 +#else +#define DUK_F_WIN32 +#endif +#endif + +/* Flash player (e.g. Crossbridge) */ +#if defined(__FLASHPLAYER__) +#define DUK_F_FLASHPLAYER +#endif + +/* QNX */ +#if defined(__QNX__) +#define DUK_F_QNX +#endif + +/* TI-Nspire (using Ndless) */ +#if defined(_TINSPIRE) +#define DUK_F_TINSPIRE +#endif + +/* Emscripten (provided explicitly by user), improve if possible */ +#if defined(EMSCRIPTEN) +#define DUK_F_EMSCRIPTEN +#endif + +/* BCC (Bruce's C compiler): this is a "torture target" for compilation */ +#if defined(__BCC__) || defined(__BCC_VERSION__) +#define DUK_F_BCC +#endif + +/* Linux */ +#if defined(__linux) || defined(__linux__) || defined(linux) +#define DUK_F_LINUX +#endif + +/* illumos / Solaris */ +#if defined(__sun) && defined(__SVR4) +#define DUK_F_SUN +#if defined(__SUNPRO_C) && (__SUNPRO_C < 0x550) +#define DUK_F_OLD_SOLARIS +/* Defines _ILP32 / _LP64 required by DUK_F_X86/DUK_F_X64. Platforms + * are processed before architectures, so this happens before the + * DUK_F_X86/DUK_F_X64 detection is emitted. + */ +#include <sys/isa_defs.h> +#endif +#endif + +/* AIX */ +#if defined(_AIX) +/* defined(__xlc__) || defined(__IBMC__): works but too wide */ +#define DUK_F_AIX +#endif + +/* HPUX */ +#if defined(__hpux) +#define DUK_F_HPUX +#if defined(__ia64) +#define DUK_F_HPUX_ITANIUM +#endif +#endif + +/* POSIX */ +#if defined(__posix) +#define DUK_F_POSIX +#endif + +/* Cygwin */ +#if defined(__CYGWIN__) +#define DUK_F_CYGWIN +#endif + +/* Generic Unix (includes Cygwin) */ +#if defined(__unix) || defined(__unix__) || defined(unix) || \ + defined(DUK_F_LINUX) || defined(DUK_F_BSD) +#define DUK_F_UNIX +#endif + +/* Intel x86 (32-bit), x64 (64-bit) or x32 (64-bit but 32-bit pointers), + * define only one of DUK_F_X86, DUK_F_X64, DUK_F_X32. + * https://sites.google.com/site/x32abi/ + * + * With DUK_F_OLD_SOLARIS the <sys/isa_defs.h> header must be included + * before this. + */ +#if defined(__amd64__) || defined(__amd64) || \ + defined(__x86_64__) || defined(__x86_64) || \ + defined(_M_X64) || defined(_M_AMD64) +#if defined(__ILP32__) || defined(_ILP32) +#define DUK_F_X32 +#else +#define DUK_F_X64 +#endif +#elif defined(i386) || defined(__i386) || defined(__i386__) || \ + defined(__i486__) || defined(__i586__) || defined(__i686__) || \ + defined(__IA32__) || defined(_M_IX86) || defined(__X86__) || \ + defined(_X86_) || defined(__THW_INTEL__) || defined(__I86__) +#if defined(__LP64__) || defined(_LP64) +/* This should not really happen, but would indicate x64. */ +#define DUK_F_X64 +#else +#define DUK_F_X86 +#endif +#endif + +/* ARM */ +#if defined(__arm__) || defined(__thumb__) || defined(_ARM) || defined(_M_ARM) || defined(__aarch64__) +#define DUK_F_ARM +#if defined(__LP64__) || defined(_LP64) || defined(__arm64) || defined(__arm64__) || defined(__aarch64__) +#define DUK_F_ARM64 +#else +#define DUK_F_ARM32 +#endif +#endif + +/* MIPS. Related defines: __MIPSEB__, __MIPSEL__, __mips_isa_rev, __LP64__ */ +#if defined(__mips__) || defined(mips) || defined(_MIPS_ISA) || \ + defined(_R3000) || defined(_R4000) || defined(_R5900) || \ + defined(_MIPS_ISA_MIPS1) || defined(_MIPS_ISA_MIPS2) || \ + defined(_MIPS_ISA_MIPS3) || defined(_MIPS_ISA_MIPS4) || \ + defined(__mips) || defined(__MIPS__) +#define DUK_F_MIPS +#if defined(__LP64__) || defined(_LP64) || defined(__mips64) || \ + defined(__mips64__) || defined(__mips_n64) +#define DUK_F_MIPS64 +#else +#define DUK_F_MIPS32 +#endif +#endif + +/* SPARC */ +#if defined(sparc) || defined(__sparc) || defined(__sparc__) +#define DUK_F_SPARC +#if defined(__LP64__) || defined(_LP64) +#define DUK_F_SPARC64 +#else +#define DUK_F_SPARC32 +#endif +#endif + +/* SuperH */ +#if defined(__sh__) || \ + defined(__sh1__) || defined(__SH1__) || \ + defined(__sh2__) || defined(__SH2__) || \ + defined(__sh3__) || defined(__SH3__) || \ + defined(__sh4__) || defined(__SH4__) || \ + defined(__sh5__) || defined(__SH5__) +#define DUK_F_SUPERH +#endif + +/* Clang */ +#if defined(__clang__) +#define DUK_F_CLANG +#endif + +/* C++ */ +#undef DUK_F_CPP +#if defined(__cplusplus) +#define DUK_F_CPP +#endif + +/* C99 or above */ +#undef DUK_F_C99 +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) +#define DUK_F_C99 +#endif + +/* C++11 or above */ +#undef DUK_F_CPP11 +#if defined(__cplusplus) && (__cplusplus >= 201103L) +#define DUK_F_CPP11 +#endif + +/* GCC. Clang also defines __GNUC__ so don't detect GCC if using Clang. */ +#if defined(__GNUC__) && !defined(__clang__) && !defined(DUK_F_CLANG) +#define DUK_F_GCC +#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) +/* Convenience, e.g. gcc 4.5.1 == 40501; http://stackoverflow.com/questions/6031819/emulating-gccs-builtin-unreachable */ +#define DUK_F_GCC_VERSION (__GNUC__ * 10000L + __GNUC_MINOR__ * 100L + __GNUC_PATCHLEVEL__) +#else +#error cannot figure out gcc version +#endif +#endif + +/* MinGW. Also GCC flags (DUK_F_GCC) are enabled now. */ +#if defined(__MINGW32__) || defined(__MINGW64__) +#define DUK_F_MINGW +#endif + +/* MSVC */ +#if defined(_MSC_VER) +/* MSVC preprocessor defines: http://msdn.microsoft.com/en-us/library/b0084kay.aspx + * _MSC_FULL_VER includes the build number, but it has at least two formats, see e.g. + * BOOST_MSVC_FULL_VER in http://www.boost.org/doc/libs/1_52_0/boost/config/compiler/visualc.hpp + */ +#define DUK_F_MSVC +#if defined(_MSC_FULL_VER) +#if (_MSC_FULL_VER > 100000000) +#define DUK_F_MSVC_FULL_VER _MSC_FULL_VER +#else +#define DUK_F_MSCV_FULL_VER (_MSC_FULL_VER * 10) +#endif +#endif +#endif /* _MSC_VER */ + +/* TinyC */ +#if defined(__TINYC__) +/* http://bellard.org/tcc/tcc-doc.html#SEC9 */ +#define DUK_F_TINYC +#endif + +/* VBCC */ +#if defined(__VBCC__) +#define DUK_F_VBCC +#endif + +#if defined(ANDROID) || defined(__ANDROID__) +#define DUK_F_ANDROID +#endif + +/* Atari Mint */ +#if defined(__MINT__) +#define DUK_F_MINT +#endif + +/* + * Platform autodetection + */ + +/* Workaround for older C++ compilers before including <inttypes.h>, + * see e.g.: https://sourceware.org/bugzilla/show_bug.cgi?id=15366 + */ +#if defined(__cplusplus) && !defined(__STDC_LIMIT_MACROS) +#define __STDC_LIMIT_MACROS +#endif +#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) +#define __STDC_CONSTANT_MACROS +#endif + +#if defined(DUK_F_APPLE) +/* --- Mac OSX, iPhone, Darwin --- */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <TargetConditionals.h> +#include <architecture/byte_order.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +/* http://stackoverflow.com/questions/5919996/how-to-detect-reliably-mac-os-x-ios-linux-windows-in-c-preprocessor */ +#if TARGET_IPHONE_SIMULATOR +#define DUK_USE_OS_STRING "iphone-sim" +#elif TARGET_OS_IPHONE +#define DUK_USE_OS_STRING "iphone" +#elif TARGET_OS_MAC +#define DUK_USE_OS_STRING "osx" +#else +#define DUK_USE_OS_STRING "osx-unknown" +#endif + +/* Use _setjmp() on Apple by default, see GH-55. */ +#define DUK_JMPBUF_TYPE jmp_buf +#define DUK_SETJMP(jb) _setjmp((jb)) +#define DUK_LONGJMP(jb) _longjmp((jb), 1) +#elif defined(DUK_F_ORBIS) +/* --- Orbis --- */ +/* Orbis = PS4 */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_S +/* no parsing (not an error) */ +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <machine/endian.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "orbis" +#elif defined(DUK_F_OPENBSD) +/* --- OpenBSD --- */ +/* http://www.monkey.org/openbsd/archive/ports/0401/msg00089.html */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <sys/endian.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "openbsd" +#elif defined(DUK_F_BSD) +/* --- Generic BSD --- */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <sys/endian.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "bsd" +#elif defined(DUK_F_TOS) +/* --- Atari ST TOS --- */ +#define DUK_USE_DATE_NOW_TIME +#define DUK_USE_DATE_TZO_GMTIME +/* no parsing (not an error) */ +#define DUK_USE_DATE_FMT_STRFTIME +#include <time.h> + +#define DUK_USE_OS_STRING "tos" + +/* TOS on M68K is always big endian. */ +#if !defined(DUK_USE_BYTEORDER) && defined(DUK_F_M68K) +#define DUK_USE_BYTEORDER 3 +#endif +#elif defined(DUK_F_AMIGAOS) +/* --- AmigaOS --- */ +#if defined(DUK_F_M68K) +/* AmigaOS on M68k */ +#define DUK_USE_DATE_NOW_TIME +#define DUK_USE_DATE_TZO_GMTIME +/* no parsing (not an error) */ +#define DUK_USE_DATE_FMT_STRFTIME +#include <time.h> +#elif defined(DUK_F_PPC) +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <time.h> +#if !defined(UINTPTR_MAX) +#define UINTPTR_MAX UINT_MAX +#endif +#else +#error AmigaOS but not M68K/PPC, not supported now +#endif + +#define DUK_USE_OS_STRING "amigaos" + +/* AmigaOS on M68K or PPC is always big endian. */ +#if !defined(DUK_USE_BYTEORDER) && (defined(DUK_F_M68K) || defined(DUK_F_PPC)) +#define DUK_USE_BYTEORDER 3 +#endif +#elif defined(DUK_F_DURANGO) +/* --- Durango (XboxOne) --- */ +/* Durango = XboxOne + * Configuration is nearly identical to Windows, except for + * DUK_USE_DATE_TZO_WINDOWS. + */ + +/* Initial fix: disable secure CRT related warnings when compiling Duktape + * itself (must be defined before including Windows headers). Don't define + * for user code including duktape.h. + */ +#if defined(DUK_COMPILING_DUKTAPE) && !defined(_CRT_SECURE_NO_WARNINGS) +#define _CRT_SECURE_NO_WARNINGS +#endif + +/* MSVC does not have sys/param.h */ +#define DUK_USE_DATE_NOW_WINDOWS +#define DUK_USE_DATE_TZO_WINDOWS_NO_DST +/* Note: PRS and FMT are intentionally left undefined for now. This means + * there is no platform specific date parsing/formatting but there is still + * the ISO 8601 standard format. + */ +#if defined(DUK_COMPILING_DUKTAPE) +/* Only include when compiling Duktape to avoid polluting application build + * with a lot of unnecessary defines. + */ +#include <windows.h> +#endif + +#define DUK_USE_OS_STRING "durango" + +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif +#elif defined(DUK_F_WINDOWS) +/* --- Windows --- */ +/* Windows version can't obviously be determined at compile time, + * but _WIN32_WINNT indicates the minimum version targeted: + * - https://msdn.microsoft.com/en-us/library/6sehtctf.aspx + */ + +/* Initial fix: disable secure CRT related warnings when compiling Duktape + * itself (must be defined before including Windows headers). Don't define + * for user code including duktape.h. + */ +#if defined(DUK_COMPILING_DUKTAPE) && !defined(_CRT_SECURE_NO_WARNINGS) +#define _CRT_SECURE_NO_WARNINGS +#endif + +/* Windows 32-bit and 64-bit are currently the same. */ +/* MSVC does not have sys/param.h */ + +#if defined(DUK_COMPILING_DUKTAPE) +/* Only include when compiling Duktape to avoid polluting application build + * with a lot of unnecessary defines. + */ +#include <windows.h> +#endif + +/* GetSystemTimePreciseAsFileTime() available from Windows 8: + * https://msdn.microsoft.com/en-us/library/windows/desktop/hh706895(v=vs.85).aspx + */ +#if defined(DUK_USE_DATE_NOW_WINDOWS_SUBMS) || defined(DUK_USE_DATE_NOW_WINDOWS) +/* User forced provider. */ +#else +#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0602) +#define DUK_USE_DATE_NOW_WINDOWS_SUBMS +#else +#define DUK_USE_DATE_NOW_WINDOWS +#endif +#endif + +#define DUK_USE_DATE_TZO_WINDOWS + +/* Note: PRS and FMT are intentionally left undefined for now. This means + * there is no platform specific date parsing/formatting but there is still + * the ISO 8601 standard format. + */ + +/* QueryPerformanceCounter() may go backwards in Windows XP, so enable for + * Vista and later: https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx#qpc_support_in_windows_versions + */ +#if !defined(DUK_USE_GET_MONOTONIC_TIME_WINDOWS_QPC) && \ + defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) +#define DUK_USE_GET_MONOTONIC_TIME_WINDOWS_QPC +#endif + +#define DUK_USE_OS_STRING "windows" + +/* On Windows, assume we're little endian. Even Itanium which has a + * configurable endianness runs little endian in Windows. + */ +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif +#elif defined(DUK_F_FLASHPLAYER) +/* --- Flashplayer (Crossbridge) --- */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <endian.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "flashplayer" + +#if !defined(DUK_USE_BYTEORDER) && defined(DUK_F_FLASHPLAYER) +#define DUK_USE_BYTEORDER 1 +#endif +#elif defined(DUK_F_QNX) +/* --- QNX --- */ +#if defined(DUK_F_QNX) && defined(DUK_COMPILING_DUKTAPE) +/* See: /opt/qnx650/target/qnx6/usr/include/sys/platform.h */ +#define _XOPEN_SOURCE 600 +#define _POSIX_C_SOURCE 200112L +#endif + +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "qnx" +#elif defined(DUK_F_TINSPIRE) +/* --- TI-Nspire --- */ +#if defined(DUK_COMPILING_DUKTAPE) && !defined(_XOPEN_SOURCE) +#define _XOPEN_SOURCE /* e.g. strptime */ +#endif + +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "tinspire" +#elif defined(DUK_F_EMSCRIPTEN) +/* --- Emscripten --- */ +#if defined(DUK_COMPILING_DUKTAPE) +#if !defined(_POSIX_C_SOURCE) +#define _POSIX_C_SOURCE 200809L +#endif +#if !defined(_GNU_SOURCE) +#define _GNU_SOURCE /* e.g. getdate_r */ +#endif +#if !defined(_XOPEN_SOURCE) +#define _XOPEN_SOURCE /* e.g. strptime */ +#endif +#endif /* DUK_COMPILING_DUKTAPE */ + +#include <sys/types.h> +#if defined(DUK_F_BCC) +/* no endian.h */ +#else +#include <endian.h> +#endif /* DUK_F_BCC */ +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> +#include <stdint.h> + +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME + +#define DUK_USE_OS_STRING "emscripten" +#elif defined(DUK_F_LINUX) +/* --- Linux --- */ +#if defined(DUK_COMPILING_DUKTAPE) +#if !defined(_POSIX_C_SOURCE) +#define _POSIX_C_SOURCE 200809L +#endif +#if !defined(_GNU_SOURCE) +#define _GNU_SOURCE /* e.g. getdate_r */ +#endif +#if !defined(_XOPEN_SOURCE) +#define _XOPEN_SOURCE /* e.g. strptime */ +#endif +#endif /* DUK_COMPILING_DUKTAPE */ + +#include <sys/types.h> +#if defined(DUK_F_BCC) +/* no endian.h or stdint.h */ +#else +#include <endian.h> +#include <stdint.h> +#endif /* DUK_F_BCC */ +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME + +#if 0 /* XXX: safe condition? */ +#define DUK_USE_GET_MONOTONIC_TIME_CLOCK_GETTIME +#endif + +#define DUK_USE_OS_STRING "linux" +#elif defined(DUK_F_SUN) +/* --- Solaris --- */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME + +#include <sys/types.h> +#if defined(DUK_F_OLD_SOLARIS) +/* Old Solaris with no endian.h, stdint.h */ +#define DUK_F_NO_STDINT_H +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 3 +#endif +#else /* DUK_F_OLD_SOLARIS */ +#include <ast/endian.h> +#endif /* DUK_F_OLD_SOLARIS */ + +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "solaris" +#elif defined(DUK_F_AIX) +/* --- AIX --- */ +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 3 +#endif +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "aix" +#elif defined(DUK_F_HPUX) +/* --- HPUX --- */ +#define DUK_F_NO_STDINT_H +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 3 +#endif +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "hpux" +#elif defined(DUK_F_POSIX) +/* --- Generic POSIX --- */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <endian.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_USE_OS_STRING "posix" +#elif defined(DUK_F_CYGWIN) +/* --- Cygwin --- */ +/* don't use strptime() for now */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_FMT_STRFTIME +#include <sys/types.h> +#include <endian.h> +#include <sys/param.h> +#include <sys/time.h> +#include <time.h> + +#define DUK_JMPBUF_TYPE jmp_buf +#define DUK_SETJMP(jb) _setjmp((jb)) +#define DUK_LONGJMP(jb) _longjmp((jb), 1) + +#define DUK_USE_OS_STRING "windows" +#elif defined(DUK_F_UNIX) +/* --- Generic UNIX --- */ +#define DUK_USE_DATE_NOW_GETTIMEOFDAY +#define DUK_USE_DATE_TZO_GMTIME_R +#define DUK_USE_DATE_PRS_STRPTIME +#define DUK_USE_DATE_FMT_STRFTIME +#include <time.h> +#include <sys/time.h> +#define DUK_USE_OS_STRING "unknown" +#else +/* --- Generic fallback --- */ +/* The most portable current time provider is time(), but it only has a + * one second resolution. + */ +#define DUK_USE_DATE_NOW_TIME + +/* The most portable way to figure out local time offset is gmtime(), + * but it's not thread safe so use with caution. + */ +#define DUK_USE_DATE_TZO_GMTIME + +/* Avoid custom date parsing and formatting for portability. */ +#undef DUK_USE_DATE_PRS_STRPTIME +#undef DUK_USE_DATE_FMT_STRFTIME + +/* Rely on C89 headers only; time.h must be here. */ +#include <time.h> + +#define DUK_USE_OS_STRING "unknown" +#endif /* autodetect platform */ + +/* Shared includes: C89 */ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdarg.h> /* varargs */ +#include <setjmp.h> +#include <stddef.h> /* e.g. ptrdiff_t */ +#include <math.h> +#include <limits.h> + +/* date.h is omitted, and included per platform */ + +/* Shared includes: stdint.h is C99 */ +#if defined(DUK_F_NO_STDINT_H) +/* stdint.h not available */ +#else +/* Technically C99 (C++11) but found in many systems. On some systems + * __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS must be defined before + * including stdint.h (see above). + */ +#include <stdint.h> +#endif + +/* <exception> is only included if needed, based on DUK_USE_xxx flags. */ + +/* + * Architecture autodetection + */ + +#if defined(DUK_F_X86) +/* --- x86 --- */ +#define DUK_USE_ARCH_STRING "x86" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif + +#define DUK_USE_PACKED_TVAL + +/* FreeBSD, -m32, and clang prior to 5.0 has union aliasing issues which + * break duk_tval copying. Disable packed duk_tval automatically. + */ +#if defined(DUK_F_FREEBSD) && defined(DUK_F_X86) && \ + defined(__clang__) && defined(__clang_major__) && (__clang_major__ < 5) +#undef DUK_USE_PACKED_TVAL +#endif +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_X64) +/* --- x64 --- */ +#define DUK_USE_ARCH_STRING "x64" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif +#undef DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_X32) +/* --- x32 --- */ +#define DUK_USE_ARCH_STRING "x32" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_ARM32) +/* --- ARM 32-bit --- */ +#define DUK_USE_ARCH_STRING "arm32" +/* Byte order varies, so rely on autodetect. */ +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_ARM64) +/* --- ARM 64-bit --- */ +#define DUK_USE_ARCH_STRING "arm64" +/* Byte order varies, so rely on autodetect. */ +#undef DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_MIPS32) +/* --- MIPS 32-bit --- */ +#define DUK_USE_ARCH_STRING "mips32" +/* MIPS byte order varies so rely on autodetection. */ +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_MIPS64) +/* --- MIPS 64-bit --- */ +#define DUK_USE_ARCH_STRING "mips64" +/* MIPS byte order varies so rely on autodetection. */ +#undef DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_PPC32) +/* --- PowerPC 32-bit --- */ +#define DUK_USE_ARCH_STRING "ppc32" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 3 +#endif +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_PPC64) +/* --- PowerPC 64-bit --- */ +#define DUK_USE_ARCH_STRING "ppc64" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 3 +#endif +#undef DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_SPARC32) +/* --- SPARC 32-bit --- */ +#define DUK_USE_ARCH_STRING "sparc32" +/* SPARC byte order varies so rely on autodetection. */ +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_SPARC64) +/* --- SPARC 64-bit --- */ +#define DUK_USE_ARCH_STRING "sparc64" +/* SPARC byte order varies so rely on autodetection. */ +#undef DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_SUPERH) +/* --- SuperH --- */ +#define DUK_USE_ARCH_STRING "sh" +/* Byte order varies, rely on autodetection. */ +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_M68K) +/* --- Motorola 68k --- */ +#define DUK_USE_ARCH_STRING "m68k" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 3 +#endif +#define DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#elif defined(DUK_F_EMSCRIPTEN) +/* --- Emscripten --- */ +#define DUK_USE_ARCH_STRING "emscripten" +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif +#undef DUK_USE_PACKED_TVAL +#define DUK_F_PACKED_TVAL_PROVIDED +#else +/* --- Generic --- */ +/* These are necessary wild guesses. */ +#define DUK_USE_ARCH_STRING "generic" +/* Rely on autodetection for byte order, alignment, and packed tval. */ +#endif /* autodetect architecture */ + +/* + * Compiler autodetection + */ + +#if defined(DUK_F_CLANG) +/* --- Clang --- */ +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +/* C99 / C++11 and above: rely on va_copy() which is required. */ +#define DUK_VA_COPY(dest,src) va_copy(dest,src) +#else +/* Clang: assume we have __va_copy() in non-C99 mode. */ +#define DUK_VA_COPY(dest,src) __va_copy(dest,src) +#endif + +#define DUK_NORETURN(decl) decl __attribute__((noreturn)) + +#if defined(__clang__) && defined(__has_builtin) +#if __has_builtin(__builtin_unreachable) +#define DUK_UNREACHABLE() do { __builtin_unreachable(); } while (0) +#endif +#endif + +#define DUK_USE_BRANCH_HINTS +#define DUK_LIKELY(x) __builtin_expect((x), 1) +#define DUK_UNLIKELY(x) __builtin_expect((x), 0) +#if defined(__clang__) && defined(__has_builtin) +#if __has_builtin(__builtin_unpredictable) +#define DUK_UNPREDICTABLE(x) __builtin_unpredictable((x)) +#endif +#endif + +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_NOINLINE __attribute__((noinline)) +#define DUK_INLINE inline +#define DUK_ALWAYS_INLINE inline __attribute__((always_inline)) +#endif + +/* DUK_HOT */ +/* DUK_COLD */ + +#if defined(DUK_F_DLL_BUILD) && defined(DUK_F_WINDOWS) +/* MSVC dllexport/dllimport: appropriate __declspec depends on whether we're + * compiling Duktape or the application. + */ +#if defined(DUK_COMPILING_DUKTAPE) +#define DUK_EXTERNAL_DECL extern __declspec(dllexport) +#define DUK_EXTERNAL __declspec(dllexport) +#else +#define DUK_EXTERNAL_DECL extern __declspec(dllimport) +#define DUK_EXTERNAL should_not_happen +#endif +#if defined(DUK_SINGLE_FILE) +#define DUK_INTERNAL_DECL static +#define DUK_INTERNAL static +#else +#define DUK_INTERNAL_DECL extern +#define DUK_INTERNAL /*empty*/ +#endif +#define DUK_LOCAL_DECL static +#define DUK_LOCAL static +#else +#define DUK_EXTERNAL_DECL __attribute__ ((visibility("default"))) extern +#define DUK_EXTERNAL __attribute__ ((visibility("default"))) +#if defined(DUK_SINGLE_FILE) +#if (defined(DUK_F_GCC_VERSION) && DUK_F_GCC_VERSION >= 30101) || defined(DUK_F_CLANG) +/* Minimize warnings for unused internal functions with GCC >= 3.1.1 and + * Clang. Based on documentation it should suffice to have the attribute + * in the declaration only, but in practice some warnings are generated unless + * the attribute is also applied to the definition. + */ +#define DUK_INTERNAL_DECL static __attribute__ ((unused)) +#define DUK_INTERNAL static __attribute__ ((unused)) +#else +#define DUK_INTERNAL_DECL static +#define DUK_INTERNAL static +#endif +#else +#if (defined(DUK_F_GCC_VERSION) && DUK_F_GCC_VERSION >= 30101) || defined(DUK_F_CLANG) +#define DUK_INTERNAL_DECL __attribute__ ((visibility("hidden"))) __attribute__ ((unused)) extern +#define DUK_INTERNAL __attribute__ ((visibility("hidden"))) __attribute__ ((unused)) +#else +#define DUK_INTERNAL_DECL __attribute__ ((visibility("hidden"))) extern +#define DUK_INTERNAL __attribute__ ((visibility("hidden"))) +#endif +#endif +#define DUK_LOCAL_DECL static +#define DUK_LOCAL static +#endif + +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "clang" +#else +#define DUK_USE_COMPILER_STRING "clang" +#endif + +#undef DUK_USE_VARIADIC_MACROS +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_USE_VARIADIC_MACROS +#endif + +#define DUK_USE_UNION_INITIALIZERS + +#undef DUK_USE_FLEX_C99 +#undef DUK_USE_FLEX_ZEROSIZE +#undef DUK_USE_FLEX_ONESIZE +#if defined(DUK_F_C99) +#define DUK_USE_FLEX_C99 +#else +#define DUK_USE_FLEX_ZEROSIZE +#endif + +#undef DUK_USE_GCC_PRAGMAS +#define DUK_USE_PACK_CLANG_ATTR +#elif defined(DUK_F_GCC) +/* --- GCC --- */ +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +/* C99 / C++11 and above: rely on va_copy() which is required. */ +#define DUK_VA_COPY(dest,src) va_copy(dest,src) +#else +/* GCC: assume we have __va_copy() in non-C99 mode. */ +#define DUK_VA_COPY(dest,src) __va_copy(dest,src) +#endif + +#if defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 20500L) +/* since gcc-2.5 */ +#define DUK_NORETURN(decl) decl __attribute__((noreturn)) +#endif + +#if defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 40500L) +/* since gcc-4.5 */ +#define DUK_UNREACHABLE() do { __builtin_unreachable(); } while (0) +#endif + +#define DUK_USE_BRANCH_HINTS +#if defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 40500L) +/* GCC: test not very accurate; enable only in relatively recent builds + * because of bugs in gcc-4.4 (http://lists.debian.org/debian-gcc/2010/04/msg00000.html) + */ +#define DUK_LIKELY(x) __builtin_expect((x), 1) +#define DUK_UNLIKELY(x) __builtin_expect((x), 0) +#endif +/* XXX: equivalent of clang __builtin_unpredictable? */ + +#if (defined(DUK_F_C99) || defined(DUK_F_CPP11)) && \ + defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 30101) +#define DUK_NOINLINE __attribute__((noinline)) +#define DUK_INLINE inline +#define DUK_ALWAYS_INLINE inline __attribute__((always_inline)) +#endif + +#if (defined(DUK_F_C99) || defined(DUK_F_CPP11)) && \ + defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 40300) +#define DUK_HOT __attribute__((hot)) +#define DUK_COLD __attribute__((cold)) +#endif + +#if defined(DUK_F_DLL_BUILD) && defined(DUK_F_WINDOWS) +/* MSVC dllexport/dllimport: appropriate __declspec depends on whether we're + * compiling Duktape or the application. + */ +#if defined(DUK_COMPILING_DUKTAPE) +#define DUK_EXTERNAL_DECL extern __declspec(dllexport) +#define DUK_EXTERNAL __declspec(dllexport) +#else +#define DUK_EXTERNAL_DECL extern __declspec(dllimport) +#define DUK_EXTERNAL should_not_happen +#endif +#if defined(DUK_SINGLE_FILE) +#define DUK_INTERNAL_DECL static +#define DUK_INTERNAL static +#else +#define DUK_INTERNAL_DECL extern +#define DUK_INTERNAL /*empty*/ +#endif +#define DUK_LOCAL_DECL static +#define DUK_LOCAL static +#elif defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 40000) +#define DUK_EXTERNAL_DECL __attribute__ ((visibility("default"))) extern +#define DUK_EXTERNAL __attribute__ ((visibility("default"))) +#if defined(DUK_SINGLE_FILE) +#if (defined(DUK_F_GCC_VERSION) && DUK_F_GCC_VERSION >= 30101) || defined(DUK_F_CLANG) +/* Minimize warnings for unused internal functions with GCC >= 3.1.1 and + * Clang. Based on documentation it should suffice to have the attribute + * in the declaration only, but in practice some warnings are generated unless + * the attribute is also applied to the definition. + */ +#define DUK_INTERNAL_DECL static __attribute__ ((unused)) +#define DUK_INTERNAL static __attribute__ ((unused)) +#else +#define DUK_INTERNAL_DECL static +#define DUK_INTERNAL static +#endif +#else +#if (defined(DUK_F_GCC_VERSION) && DUK_F_GCC_VERSION >= 30101) || defined(DUK_F_CLANG) +#define DUK_INTERNAL_DECL __attribute__ ((visibility("hidden"))) __attribute__ ((unused)) extern +#define DUK_INTERNAL __attribute__ ((visibility("hidden"))) __attribute__ ((unused)) +#else +#define DUK_INTERNAL_DECL __attribute__ ((visibility("hidden"))) extern +#define DUK_INTERNAL __attribute__ ((visibility("hidden"))) +#endif +#endif +#define DUK_LOCAL_DECL static +#define DUK_LOCAL static +#endif + +#if defined(DUK_F_MINGW) +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "mingw++" +#else +#define DUK_USE_COMPILER_STRING "mingw" +#endif +#else +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "g++" +#else +#define DUK_USE_COMPILER_STRING "gcc" +#endif +#endif + +#undef DUK_USE_VARIADIC_MACROS +#if defined(DUK_F_C99) || (defined(DUK_F_CPP11) && defined(__GNUC__)) +#define DUK_USE_VARIADIC_MACROS +#endif + +#define DUK_USE_UNION_INITIALIZERS + +#undef DUK_USE_FLEX_C99 +#undef DUK_USE_FLEX_ZEROSIZE +#undef DUK_USE_FLEX_ONESIZE +#if defined(DUK_F_C99) +#define DUK_USE_FLEX_C99 +#else +#define DUK_USE_FLEX_ZEROSIZE +#endif + +#if defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION >= 40600) +#define DUK_USE_GCC_PRAGMAS +#else +#undef DUK_USE_GCC_PRAGMAS +#endif + +#define DUK_USE_PACK_GCC_ATTR +#elif defined(DUK_F_MSVC) +/* --- MSVC --- */ +/* http://msdn.microsoft.com/en-us/library/aa235362(VS.60).aspx */ +#define DUK_NORETURN(decl) __declspec(noreturn) decl + +/* XXX: DUK_UNREACHABLE for msvc? */ + +#undef DUK_USE_BRANCH_HINTS + +/* XXX: DUK_LIKELY, DUK_UNLIKELY for msvc? */ +/* XXX: DUK_NOINLINE, DUK_INLINE, DUK_ALWAYS_INLINE for msvc? */ + +#if defined(DUK_F_DLL_BUILD) && defined(DUK_F_WINDOWS) +/* MSVC dllexport/dllimport: appropriate __declspec depends on whether we're + * compiling Duktape or the application. + */ +#if defined(DUK_COMPILING_DUKTAPE) +#define DUK_EXTERNAL_DECL extern __declspec(dllexport) +#define DUK_EXTERNAL __declspec(dllexport) +#else +#define DUK_EXTERNAL_DECL extern __declspec(dllimport) +#define DUK_EXTERNAL should_not_happen +#endif +#if defined(DUK_SINGLE_FILE) +#define DUK_INTERNAL_DECL static +#define DUK_INTERNAL static +#else +#define DUK_INTERNAL_DECL extern +#define DUK_INTERNAL /*empty*/ +#endif +#define DUK_LOCAL_DECL static +#define DUK_LOCAL static +#endif + +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "msvc++" +#else +#define DUK_USE_COMPILER_STRING "msvc" +#endif + +#undef DUK_USE_VARIADIC_MACROS +#if defined(DUK_F_C99) +#define DUK_USE_VARIADIC_MACROS +#elif defined(_MSC_VER) && (_MSC_VER >= 1400) +/* VS2005+ should have variadic macros even when they're not C99. */ +#define DUK_USE_VARIADIC_MACROS +#endif + +#undef DUK_USE_UNION_INITIALIZERS +#if defined(_MSC_VER) && (_MSC_VER >= 1800) +/* VS2013+ supports union initializers but there's a bug involving union-inside-struct: + * https://connect.microsoft.com/VisualStudio/feedback/details/805981 + * The bug was fixed (at least) in VS2015 so check for VS2015 for now: + * https://blogs.msdn.microsoft.com/vcblog/2015/07/01/c-compiler-front-end-fixes-in-vs2015/ + * Manually tested using VS2013, CL reports 18.00.31101, so enable for VS2013 too. + */ +#define DUK_USE_UNION_INITIALIZERS +#endif + +#undef DUK_USE_FLEX_C99 +#undef DUK_USE_FLEX_ZEROSIZE +#undef DUK_USE_FLEX_ONESIZE +#if defined(DUK_F_C99) +#define DUK_USE_FLEX_C99 +#else +#define DUK_USE_FLEX_ZEROSIZE +#endif + +#undef DUK_USE_GCC_PRAGMAS + +#define DUK_USE_PACK_MSVC_PRAGMA + +/* These have been tested from VS2008 onwards; may work in older VS versions + * too but not enabled by default. + */ +#if defined(_MSC_VER) && (_MSC_VER >= 1500) +#define DUK_NOINLINE __declspec(noinline) +#define DUK_INLINE __inline +#define DUK_ALWAYS_INLINE __forceinline +#endif + +#if defined(_MSC_VER) && (_MSC_VER >= 1900) +#define DUK_SNPRINTF snprintf +#define DUK_VSNPRINTF vsnprintf +#else +/* (v)snprintf() is missing before MSVC 2015. Note that _(v)snprintf() does + * NOT NUL terminate on truncation, but Duktape code never assumes that. + * http://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010 + */ +#define DUK_SNPRINTF _snprintf +#define DUK_VSNPRINTF _vsnprintf +#endif + +/* Avoid warning when doing DUK_UNREF(some_function). */ +#if defined(_MSC_VER) && (_MSC_VER < 1500) +#pragma warning(disable: 4100 4101 4550 4551) +#define DUK_UNREF(x) +#else +#define DUK_UNREF(x) do { __pragma(warning(suppress:4100 4101 4550 4551)) (x); } while (0) +#endif + +/* Older versions of MSVC don't support the LL/ULL suffix. */ +#define DUK_U64_CONSTANT(x) x##ui64 +#define DUK_I64_CONSTANT(x) x##i64 +#elif defined(DUK_F_EMSCRIPTEN) +/* --- Emscripten --- */ +#define DUK_NORETURN(decl) decl __attribute__((noreturn)) + +#if defined(__clang__) && defined(__has_builtin) +#if __has_builtin(__builtin_unreachable) +#define DUK_UNREACHABLE() do { __builtin_unreachable(); } while (0) +#endif +#endif + +#define DUK_USE_BRANCH_HINTS +#define DUK_LIKELY(x) __builtin_expect((x), 1) +#define DUK_UNLIKELY(x) __builtin_expect((x), 0) +#if defined(__clang__) && defined(__has_builtin) +#if __has_builtin(__builtin_unpredictable) +#define DUK_UNPREDICTABLE(x) __builtin_unpredictable((x)) +#endif +#endif + +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_NOINLINE __attribute__((noinline)) +#define DUK_INLINE inline +#define DUK_ALWAYS_INLINE inline __attribute__((always_inline)) +#endif + +#define DUK_EXTERNAL_DECL __attribute__ ((visibility("default"))) extern +#define DUK_EXTERNAL __attribute__ ((visibility("default"))) +#if defined(DUK_SINGLE_FILE) +#if (defined(DUK_F_GCC_VERSION) && DUK_F_GCC_VERSION >= 30101) || defined(DUK_F_CLANG) +/* Minimize warnings for unused internal functions with GCC >= 3.1.1 and + * Clang. Based on documentation it should suffice to have the attribute + * in the declaration only, but in practice some warnings are generated unless + * the attribute is also applied to the definition. + */ +#define DUK_INTERNAL_DECL static __attribute__ ((unused)) +#define DUK_INTERNAL static __attribute__ ((unused)) +#else +#define DUK_INTERNAL_DECL static +#define DUK_INTERNAL static +#endif +#else +#if (defined(DUK_F_GCC_VERSION) && DUK_F_GCC_VERSION >= 30101) || defined(DUK_F_CLANG) +#define DUK_INTERNAL_DECL __attribute__ ((visibility("hidden"))) __attribute__ ((unused)) extern +#define DUK_INTERNAL __attribute__ ((visibility("hidden"))) __attribute__ ((unused)) +#else +#define DUK_INTERNAL_DECL __attribute__ ((visibility("hidden"))) extern +#define DUK_INTERNAL __attribute__ ((visibility("hidden"))) +#endif +#endif +#define DUK_LOCAL_DECL static +#define DUK_LOCAL static + +#define DUK_USE_COMPILER_STRING "emscripten" + +#undef DUK_USE_VARIADIC_MACROS +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_USE_VARIADIC_MACROS +#endif + +#define DUK_USE_UNION_INITIALIZERS + +#undef DUK_USE_FLEX_C99 +#undef DUK_USE_FLEX_ZEROSIZE +#undef DUK_USE_FLEX_ONESIZE +#if defined(DUK_F_C99) +#define DUK_USE_FLEX_C99 +#else +#define DUK_USE_FLEX_ZEROSIZE +#endif + +#undef DUK_USE_GCC_PRAGMAS +#define DUK_USE_PACK_CLANG_ATTR +#elif defined(DUK_F_TINYC) +/* --- TinyC --- */ +#undef DUK_USE_BRANCH_HINTS + +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "tinyc++" +#else +#define DUK_USE_COMPILER_STRING "tinyc" +#endif + +/* http://bellard.org/tcc/tcc-doc.html#SEC7 */ +#define DUK_USE_VARIADIC_MACROS + +#define DUK_USE_UNION_INITIALIZERS + +/* Most portable, wastes space */ +#define DUK_USE_FLEX_ONESIZE + +/* Most portable, potentially wastes space */ +#define DUK_USE_PACK_DUMMY_MEMBER +#elif defined(DUK_F_VBCC) +/* --- VBCC --- */ +#undef DUK_USE_BRANCH_HINTS + +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "vbcc-c++" +#else +#define DUK_USE_COMPILER_STRING "vbcc" +#endif + +#undef DUK_USE_VARIADIC_MACROS +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_USE_VARIADIC_MACROS +#endif + +/* VBCC supports C99 so check only for C99 for union initializer support. + * Designated union initializers would possibly work even without a C99 check. + */ +#undef DUK_USE_UNION_INITIALIZERS +#if defined(DUK_F_C99) +#define DUK_USE_UNION_INITIALIZERS +#endif + +#define DUK_USE_FLEX_ZEROSIZE +#define DUK_USE_PACK_DUMMY_MEMBER +#elif defined(DUK_F_BCC) +/* --- Bruce's C compiler --- */ +#undef DUK_USE_BRANCH_HINTS + +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "bcc++" +#else +#define DUK_USE_COMPILER_STRING "bcc" +#endif + +/* Most portable */ +#undef DUK_USE_VARIADIC_MACROS + +/* Most portable, wastes space */ +#undef DUK_USE_UNION_INITIALIZERS + +/* Most portable, wastes space */ +#define DUK_USE_FLEX_ONESIZE + +/* Most portable, potentially wastes space */ +#define DUK_USE_PACK_DUMMY_MEMBER + +/* BCC, assume we're on x86. */ +#if !defined(DUK_USE_BYTEORDER) +#define DUK_USE_BYTEORDER 1 +#endif +#else +/* --- Generic --- */ +#undef DUK_USE_BRANCH_HINTS + +#if defined(DUK_F_CPP) +#define DUK_USE_COMPILER_STRING "generic-c++" +#else +#define DUK_USE_COMPILER_STRING "generic" +#endif + +#undef DUK_USE_VARIADIC_MACROS +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_USE_VARIADIC_MACROS +#endif + +/* C++ doesn't have standard designated union initializers ({ .foo = 1 }). */ +#undef DUK_USE_UNION_INITIALIZERS +#if defined(DUK_F_C99) +#define DUK_USE_UNION_INITIALIZERS +#endif + +/* Most portable, wastes space */ +#define DUK_USE_FLEX_ONESIZE + +/* Most portable, potentially wastes space */ +#define DUK_USE_PACK_DUMMY_MEMBER +#endif /* autodetect compiler */ + +/* uclibc */ +#if defined(__UCLIBC__) +#define DUK_F_UCLIBC +#endif + +/* + * Wrapper typedefs and constants for integer types, also sanity check types. + * + * C99 typedefs are quite good but not always available, and we want to avoid + * forcibly redefining the C99 typedefs. So, there are Duktape wrappers for + * all C99 typedefs and Duktape code should only use these typedefs. Type + * detection when C99 is not supported is best effort and may end up detecting + * some types incorrectly. + * + * Pointer sizes are a portability problem: pointers to different types may + * have a different size and function pointers are very difficult to manage + * portably. + * + * http://en.wikipedia.org/wiki/C_data_types#Fixed-width_integer_types + * + * Note: there's an interesting corner case when trying to define minimum + * signed integer value constants which leads to the current workaround of + * defining e.g. -0x80000000 as (-0x7fffffffL - 1L). See doc/code-issues.txt + * for a longer discussion. + * + * Note: avoid typecasts and computations in macro integer constants as they + * can then no longer be used in macro relational expressions (such as + * #if DUK_SIZE_MAX < 0xffffffffUL). There is internal code which relies on + * being able to compare DUK_SIZE_MAX against a limit. + */ + +/* XXX: add feature options to force basic types from outside? */ + +#if !defined(INT_MAX) +#error INT_MAX not defined +#endif + +/* Check that architecture is two's complement, standard C allows e.g. + * INT_MIN to be -2**31+1 (instead of -2**31). + */ +#if defined(INT_MAX) && defined(INT_MIN) +#if INT_MAX != -(INT_MIN + 1) +#error platform does not seem complement of two +#endif +#else +#error cannot check complement of two +#endif + +/* Pointer size determination based on __WORDSIZE or architecture when + * that's not available. + */ +#if defined(DUK_F_X86) || defined(DUK_F_X32) || \ + defined(DUK_F_M68K) || defined(DUK_F_PPC32) || \ + defined(DUK_F_BCC) || \ + (defined(__WORDSIZE) && (__WORDSIZE == 32)) || \ + ((defined(DUK_F_OLD_SOLARIS) || defined(DUK_F_AIX) || \ + defined(DUK_F_HPUX)) && defined(_ILP32)) || \ + defined(DUK_F_ARM32) +#define DUK_F_32BIT_PTRS +#elif defined(DUK_F_X64) || \ + (defined(__WORDSIZE) && (__WORDSIZE == 64)) || \ + ((defined(DUK_F_OLD_SOLARIS) || defined(DUK_F_AIX) || \ + defined(DUK_F_HPUX)) && defined(_LP64)) || \ + defined(DUK_F_ARM64) +#define DUK_F_64BIT_PTRS +#else +/* not sure, not needed with C99 anyway */ +#endif + +/* Intermediate define for 'have inttypes.h' */ +#undef DUK_F_HAVE_INTTYPES +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \ + !(defined(DUK_F_AMIGAOS) && defined(DUK_F_VBCC)) +/* vbcc + AmigaOS has C99 but no inttypes.h */ +#define DUK_F_HAVE_INTTYPES +#elif defined(__cplusplus) && (__cplusplus >= 201103L) +/* C++11 apparently ratified stdint.h */ +#define DUK_F_HAVE_INTTYPES +#endif + +/* Basic integer typedefs and limits, preferably from inttypes.h, otherwise + * through automatic detection. + */ +#if defined(DUK_F_HAVE_INTTYPES) +/* C99 or compatible */ + +#define DUK_F_HAVE_64BIT +#include <inttypes.h> + +typedef uint8_t duk_uint8_t; +typedef int8_t duk_int8_t; +typedef uint16_t duk_uint16_t; +typedef int16_t duk_int16_t; +typedef uint32_t duk_uint32_t; +typedef int32_t duk_int32_t; +typedef uint64_t duk_uint64_t; +typedef int64_t duk_int64_t; +typedef uint_least8_t duk_uint_least8_t; +typedef int_least8_t duk_int_least8_t; +typedef uint_least16_t duk_uint_least16_t; +typedef int_least16_t duk_int_least16_t; +typedef uint_least32_t duk_uint_least32_t; +typedef int_least32_t duk_int_least32_t; +typedef uint_least64_t duk_uint_least64_t; +typedef int_least64_t duk_int_least64_t; +typedef uint_fast8_t duk_uint_fast8_t; +typedef int_fast8_t duk_int_fast8_t; +typedef uint_fast16_t duk_uint_fast16_t; +typedef int_fast16_t duk_int_fast16_t; +typedef uint_fast32_t duk_uint_fast32_t; +typedef int_fast32_t duk_int_fast32_t; +typedef uint_fast64_t duk_uint_fast64_t; +typedef int_fast64_t duk_int_fast64_t; +typedef uintptr_t duk_uintptr_t; +typedef intptr_t duk_intptr_t; +typedef uintmax_t duk_uintmax_t; +typedef intmax_t duk_intmax_t; + +#define DUK_UINT8_MIN 0 +#define DUK_UINT8_MAX UINT8_MAX +#define DUK_INT8_MIN INT8_MIN +#define DUK_INT8_MAX INT8_MAX +#define DUK_UINT_LEAST8_MIN 0 +#define DUK_UINT_LEAST8_MAX UINT_LEAST8_MAX +#define DUK_INT_LEAST8_MIN INT_LEAST8_MIN +#define DUK_INT_LEAST8_MAX INT_LEAST8_MAX +#define DUK_UINT_FAST8_MIN 0 +#define DUK_UINT_FAST8_MAX UINT_FAST8_MAX +#define DUK_INT_FAST8_MIN INT_FAST8_MIN +#define DUK_INT_FAST8_MAX INT_FAST8_MAX +#define DUK_UINT16_MIN 0 +#define DUK_UINT16_MAX UINT16_MAX +#define DUK_INT16_MIN INT16_MIN +#define DUK_INT16_MAX INT16_MAX +#define DUK_UINT_LEAST16_MIN 0 +#define DUK_UINT_LEAST16_MAX UINT_LEAST16_MAX +#define DUK_INT_LEAST16_MIN INT_LEAST16_MIN +#define DUK_INT_LEAST16_MAX INT_LEAST16_MAX +#define DUK_UINT_FAST16_MIN 0 +#define DUK_UINT_FAST16_MAX UINT_FAST16_MAX +#define DUK_INT_FAST16_MIN INT_FAST16_MIN +#define DUK_INT_FAST16_MAX INT_FAST16_MAX +#define DUK_UINT32_MIN 0 +#define DUK_UINT32_MAX UINT32_MAX +#define DUK_INT32_MIN INT32_MIN +#define DUK_INT32_MAX INT32_MAX +#define DUK_UINT_LEAST32_MIN 0 +#define DUK_UINT_LEAST32_MAX UINT_LEAST32_MAX +#define DUK_INT_LEAST32_MIN INT_LEAST32_MIN +#define DUK_INT_LEAST32_MAX INT_LEAST32_MAX +#define DUK_UINT_FAST32_MIN 0 +#define DUK_UINT_FAST32_MAX UINT_FAST32_MAX +#define DUK_INT_FAST32_MIN INT_FAST32_MIN +#define DUK_INT_FAST32_MAX INT_FAST32_MAX +#define DUK_UINT64_MIN 0 +#define DUK_UINT64_MAX UINT64_MAX +#define DUK_INT64_MIN INT64_MIN +#define DUK_INT64_MAX INT64_MAX +#define DUK_UINT_LEAST64_MIN 0 +#define DUK_UINT_LEAST64_MAX UINT_LEAST64_MAX +#define DUK_INT_LEAST64_MIN INT_LEAST64_MIN +#define DUK_INT_LEAST64_MAX INT_LEAST64_MAX +#define DUK_UINT_FAST64_MIN 0 +#define DUK_UINT_FAST64_MAX UINT_FAST64_MAX +#define DUK_INT_FAST64_MIN INT_FAST64_MIN +#define DUK_INT_FAST64_MAX INT_FAST64_MAX + +#define DUK_UINTPTR_MIN 0 +#define DUK_UINTPTR_MAX UINTPTR_MAX +#define DUK_INTPTR_MIN INTPTR_MIN +#define DUK_INTPTR_MAX INTPTR_MAX + +#define DUK_UINTMAX_MIN 0 +#define DUK_UINTMAX_MAX UINTMAX_MAX +#define DUK_INTMAX_MIN INTMAX_MIN +#define DUK_INTMAX_MAX INTMAX_MAX + +#define DUK_SIZE_MIN 0 +#define DUK_SIZE_MAX SIZE_MAX +#undef DUK_SIZE_MAX_COMPUTED + +#else /* C99 types */ + +/* When C99 types are not available, we use heuristic detection to get + * the basic 8, 16, 32, and (possibly) 64 bit types. The fast/least + * types are then assumed to be exactly the same for now: these could + * be improved per platform but C99 types are very often now available. + * 64-bit types are not available on all platforms; this is OK at least + * on 32-bit platforms. + * + * This detection code is necessarily a bit hacky and can provide typedefs + * and defines that won't work correctly on some exotic platform. + */ + +#if (defined(CHAR_BIT) && (CHAR_BIT == 8)) || \ + (defined(UCHAR_MAX) && (UCHAR_MAX == 255)) +typedef unsigned char duk_uint8_t; +typedef signed char duk_int8_t; +#else +#error cannot detect 8-bit type +#endif + +#if defined(USHRT_MAX) && (USHRT_MAX == 65535UL) +typedef unsigned short duk_uint16_t; +typedef signed short duk_int16_t; +#elif defined(UINT_MAX) && (UINT_MAX == 65535UL) +/* On some platforms int is 16-bit but long is 32-bit (e.g. PureC) */ +typedef unsigned int duk_uint16_t; +typedef signed int duk_int16_t; +#else +#error cannot detect 16-bit type +#endif + +#if defined(UINT_MAX) && (UINT_MAX == 4294967295UL) +typedef unsigned int duk_uint32_t; +typedef signed int duk_int32_t; +#elif defined(ULONG_MAX) && (ULONG_MAX == 4294967295UL) +/* On some platforms int is 16-bit but long is 32-bit (e.g. PureC) */ +typedef unsigned long duk_uint32_t; +typedef signed long duk_int32_t; +#else +#error cannot detect 32-bit type +#endif + +/* 64-bit type detection is a bit tricky. + * + * ULLONG_MAX is a standard define. __LONG_LONG_MAX__ and __ULONG_LONG_MAX__ + * are used by at least GCC (even if system headers don't provide ULLONG_MAX). + * Some GCC variants may provide __LONG_LONG_MAX__ but not __ULONG_LONG_MAX__. + * + * ULL / LL constants are rejected / warned about by some compilers, even if + * the compiler has a 64-bit type and the compiler/system headers provide an + * unsupported constant (ULL/LL)! Try to avoid using ULL / LL constants. + * As a side effect we can only check that e.g. ULONG_MAX is larger than 32 + * bits but can't be sure it is exactly 64 bits. Self tests will catch such + * cases. + */ +#undef DUK_F_HAVE_64BIT +#if !defined(DUK_F_HAVE_64BIT) && defined(ULONG_MAX) +#if (ULONG_MAX > 4294967295UL) +#define DUK_F_HAVE_64BIT +typedef unsigned long duk_uint64_t; +typedef signed long duk_int64_t; +#endif +#endif +#if !defined(DUK_F_HAVE_64BIT) && defined(ULLONG_MAX) +#if (ULLONG_MAX > 4294967295UL) +#define DUK_F_HAVE_64BIT +typedef unsigned long long duk_uint64_t; +typedef signed long long duk_int64_t; +#endif +#endif +#if !defined(DUK_F_HAVE_64BIT) && defined(__ULONG_LONG_MAX__) +#if (__ULONG_LONG_MAX__ > 4294967295UL) +#define DUK_F_HAVE_64BIT +typedef unsigned long long duk_uint64_t; +typedef signed long long duk_int64_t; +#endif +#endif +#if !defined(DUK_F_HAVE_64BIT) && defined(__LONG_LONG_MAX__) +#if (__LONG_LONG_MAX__ > 2147483647L) +#define DUK_F_HAVE_64BIT +typedef unsigned long long duk_uint64_t; +typedef signed long long duk_int64_t; +#endif +#endif +#if !defined(DUK_F_HAVE_64BIT) && defined(DUK_F_MINGW) +#define DUK_F_HAVE_64BIT +typedef unsigned long duk_uint64_t; +typedef signed long duk_int64_t; +#endif +#if !defined(DUK_F_HAVE_64BIT) && defined(DUK_F_MSVC) +#define DUK_F_HAVE_64BIT +typedef unsigned __int64 duk_uint64_t; +typedef signed __int64 duk_int64_t; +#endif +#if !defined(DUK_F_HAVE_64BIT) +/* cannot detect 64-bit type, not always needed so don't error */ +#endif + +typedef duk_uint8_t duk_uint_least8_t; +typedef duk_int8_t duk_int_least8_t; +typedef duk_uint16_t duk_uint_least16_t; +typedef duk_int16_t duk_int_least16_t; +typedef duk_uint32_t duk_uint_least32_t; +typedef duk_int32_t duk_int_least32_t; +typedef duk_uint8_t duk_uint_fast8_t; +typedef duk_int8_t duk_int_fast8_t; +typedef duk_uint16_t duk_uint_fast16_t; +typedef duk_int16_t duk_int_fast16_t; +typedef duk_uint32_t duk_uint_fast32_t; +typedef duk_int32_t duk_int_fast32_t; +#if defined(DUK_F_HAVE_64BIT) +typedef duk_uint64_t duk_uint_least64_t; +typedef duk_int64_t duk_int_least64_t; +typedef duk_uint64_t duk_uint_fast64_t; +typedef duk_int64_t duk_int_fast64_t; +#endif +#if defined(DUK_F_HAVE_64BIT) +typedef duk_uint64_t duk_uintmax_t; +typedef duk_int64_t duk_intmax_t; +#else +typedef duk_uint32_t duk_uintmax_t; +typedef duk_int32_t duk_intmax_t; +#endif + +/* Note: the funny looking computations for signed minimum 16-bit, 32-bit, and + * 64-bit values are intentional as the obvious forms (e.g. -0x80000000L) are + * -not- portable. See code-issues.txt for a detailed discussion. + */ +#define DUK_UINT8_MIN 0UL +#define DUK_UINT8_MAX 0xffUL +#define DUK_INT8_MIN (-0x80L) +#define DUK_INT8_MAX 0x7fL +#define DUK_UINT_LEAST8_MIN 0UL +#define DUK_UINT_LEAST8_MAX 0xffUL +#define DUK_INT_LEAST8_MIN (-0x80L) +#define DUK_INT_LEAST8_MAX 0x7fL +#define DUK_UINT_FAST8_MIN 0UL +#define DUK_UINT_FAST8_MAX 0xffUL +#define DUK_INT_FAST8_MIN (-0x80L) +#define DUK_INT_FAST8_MAX 0x7fL +#define DUK_UINT16_MIN 0UL +#define DUK_UINT16_MAX 0xffffUL +#define DUK_INT16_MIN (-0x7fffL - 1L) +#define DUK_INT16_MAX 0x7fffL +#define DUK_UINT_LEAST16_MIN 0UL +#define DUK_UINT_LEAST16_MAX 0xffffUL +#define DUK_INT_LEAST16_MIN (-0x7fffL - 1L) +#define DUK_INT_LEAST16_MAX 0x7fffL +#define DUK_UINT_FAST16_MIN 0UL +#define DUK_UINT_FAST16_MAX 0xffffUL +#define DUK_INT_FAST16_MIN (-0x7fffL - 1L) +#define DUK_INT_FAST16_MAX 0x7fffL +#define DUK_UINT32_MIN 0UL +#define DUK_UINT32_MAX 0xffffffffUL +#define DUK_INT32_MIN (-0x7fffffffL - 1L) +#define DUK_INT32_MAX 0x7fffffffL +#define DUK_UINT_LEAST32_MIN 0UL +#define DUK_UINT_LEAST32_MAX 0xffffffffUL +#define DUK_INT_LEAST32_MIN (-0x7fffffffL - 1L) +#define DUK_INT_LEAST32_MAX 0x7fffffffL +#define DUK_UINT_FAST32_MIN 0UL +#define DUK_UINT_FAST32_MAX 0xffffffffUL +#define DUK_INT_FAST32_MIN (-0x7fffffffL - 1L) +#define DUK_INT_FAST32_MAX 0x7fffffffL + +/* 64-bit constants. Since LL / ULL constants are not always available, + * use computed values. These values can't be used in preprocessor + * comparisons; flag them as such. + */ +#if defined(DUK_F_HAVE_64BIT) +#define DUK_UINT64_MIN ((duk_uint64_t) 0) +#define DUK_UINT64_MAX ((duk_uint64_t) -1) +#define DUK_INT64_MIN ((duk_int64_t) (~(DUK_UINT64_MAX >> 1))) +#define DUK_INT64_MAX ((duk_int64_t) (DUK_UINT64_MAX >> 1)) +#define DUK_UINT_LEAST64_MIN DUK_UINT64_MIN +#define DUK_UINT_LEAST64_MAX DUK_UINT64_MAX +#define DUK_INT_LEAST64_MIN DUK_INT64_MIN +#define DUK_INT_LEAST64_MAX DUK_INT64_MAX +#define DUK_UINT_FAST64_MIN DUK_UINT64_MIN +#define DUK_UINT_FAST64_MAX DUK_UINT64_MAX +#define DUK_INT_FAST64_MIN DUK_INT64_MIN +#define DUK_INT_FAST64_MAX DUK_INT64_MAX +#define DUK_UINT64_MIN_COMPUTED +#define DUK_UINT64_MAX_COMPUTED +#define DUK_INT64_MIN_COMPUTED +#define DUK_INT64_MAX_COMPUTED +#define DUK_UINT_LEAST64_MIN_COMPUTED +#define DUK_UINT_LEAST64_MAX_COMPUTED +#define DUK_INT_LEAST64_MIN_COMPUTED +#define DUK_INT_LEAST64_MAX_COMPUTED +#define DUK_UINT_FAST64_MIN_COMPUTED +#define DUK_UINT_FAST64_MAX_COMPUTED +#define DUK_INT_FAST64_MIN_COMPUTED +#define DUK_INT_FAST64_MAX_COMPUTED +#endif + +#if defined(DUK_F_HAVE_64BIT) +#define DUK_UINTMAX_MIN DUK_UINT64_MIN +#define DUK_UINTMAX_MAX DUK_UINT64_MAX +#define DUK_INTMAX_MIN DUK_INT64_MIN +#define DUK_INTMAX_MAX DUK_INT64_MAX +#define DUK_UINTMAX_MIN_COMPUTED +#define DUK_UINTMAX_MAX_COMPUTED +#define DUK_INTMAX_MIN_COMPUTED +#define DUK_INTMAX_MAX_COMPUTED +#else +#define DUK_UINTMAX_MIN 0UL +#define DUK_UINTMAX_MAX 0xffffffffUL +#define DUK_INTMAX_MIN (-0x7fffffffL - 1L) +#define DUK_INTMAX_MAX 0x7fffffffL +#endif + +/* This detection is not very reliable. */ +#if defined(DUK_F_32BIT_PTRS) +typedef duk_int32_t duk_intptr_t; +typedef duk_uint32_t duk_uintptr_t; +#define DUK_UINTPTR_MIN DUK_UINT32_MIN +#define DUK_UINTPTR_MAX DUK_UINT32_MAX +#define DUK_INTPTR_MIN DUK_INT32_MIN +#define DUK_INTPTR_MAX DUK_INT32_MAX +#elif defined(DUK_F_64BIT_PTRS) && defined(DUK_F_HAVE_64BIT) +typedef duk_int64_t duk_intptr_t; +typedef duk_uint64_t duk_uintptr_t; +#define DUK_UINTPTR_MIN DUK_UINT64_MIN +#define DUK_UINTPTR_MAX DUK_UINT64_MAX +#define DUK_INTPTR_MIN DUK_INT64_MIN +#define DUK_INTPTR_MAX DUK_INT64_MAX +#define DUK_UINTPTR_MIN_COMPUTED +#define DUK_UINTPTR_MAX_COMPUTED +#define DUK_INTPTR_MIN_COMPUTED +#define DUK_INTPTR_MAX_COMPUTED +#else +#error cannot determine intptr type +#endif + +/* SIZE_MAX may be missing so use an approximate value for it. */ +#undef DUK_SIZE_MAX_COMPUTED +#if !defined(SIZE_MAX) +#define DUK_SIZE_MAX_COMPUTED +#define SIZE_MAX ((size_t) (-1)) +#endif +#define DUK_SIZE_MIN 0 +#define DUK_SIZE_MAX SIZE_MAX + +#endif /* C99 types */ + +/* A few types are assumed to always exist. */ +typedef size_t duk_size_t; +typedef ptrdiff_t duk_ptrdiff_t; + +/* The best type for an "all around int" in Duktape internals is "at least + * 32 bit signed integer" which is most convenient. Same for unsigned type. + * Prefer 'int' when large enough, as it is almost always a convenient type. + */ +#if defined(UINT_MAX) && (UINT_MAX >= 0xffffffffUL) +typedef int duk_int_t; +typedef unsigned int duk_uint_t; +#define DUK_INT_MIN INT_MIN +#define DUK_INT_MAX INT_MAX +#define DUK_UINT_MIN 0 +#define DUK_UINT_MAX UINT_MAX +#else +typedef duk_int_fast32_t duk_int_t; +typedef duk_uint_fast32_t duk_uint_t; +#define DUK_INT_MIN DUK_INT_FAST32_MIN +#define DUK_INT_MAX DUK_INT_FAST32_MAX +#define DUK_UINT_MIN DUK_UINT_FAST32_MIN +#define DUK_UINT_MAX DUK_UINT_FAST32_MAX +#endif + +/* Same as 'duk_int_t' but guaranteed to be a 'fast' variant if this + * distinction matters for the CPU. These types are used mainly in the + * executor where it might really matter. + */ +typedef duk_int_fast32_t duk_int_fast_t; +typedef duk_uint_fast32_t duk_uint_fast_t; +#define DUK_INT_FAST_MIN DUK_INT_FAST32_MIN +#define DUK_INT_FAST_MAX DUK_INT_FAST32_MAX +#define DUK_UINT_FAST_MIN DUK_UINT_FAST32_MIN +#define DUK_UINT_FAST_MAX DUK_UINT_FAST32_MAX + +/* Small integers (16 bits or more) can fall back to the 'int' type, but + * have a typedef so they are marked "small" explicitly. + */ +typedef int duk_small_int_t; +typedef unsigned int duk_small_uint_t; +#define DUK_SMALL_INT_MIN INT_MIN +#define DUK_SMALL_INT_MAX INT_MAX +#define DUK_SMALL_UINT_MIN 0 +#define DUK_SMALL_UINT_MAX UINT_MAX + +/* Fast variants of small integers, again for really fast paths like the + * executor. + */ +typedef duk_int_fast16_t duk_small_int_fast_t; +typedef duk_uint_fast16_t duk_small_uint_fast_t; +#define DUK_SMALL_INT_FAST_MIN DUK_INT_FAST16_MIN +#define DUK_SMALL_INT_FAST_MAX DUK_INT_FAST16_MAX +#define DUK_SMALL_UINT_FAST_MIN DUK_UINT_FAST16_MIN +#define DUK_SMALL_UINT_FAST_MAX DUK_UINT_FAST16_MAX + +/* Boolean values are represented with the platform 'unsigned int'. */ +typedef duk_small_uint_t duk_bool_t; +#define DUK_BOOL_MIN DUK_SMALL_UINT_MIN +#define DUK_BOOL_MAX DUK_SMALL_UINT_MAX + +/* Index values must have at least 32-bit signed range. */ +typedef duk_int_t duk_idx_t; +#define DUK_IDX_MIN DUK_INT_MIN +#define DUK_IDX_MAX DUK_INT_MAX + +/* Unsigned index variant. */ +typedef duk_uint_t duk_uidx_t; +#define DUK_UIDX_MIN DUK_UINT_MIN +#define DUK_UIDX_MAX DUK_UINT_MAX + +/* Array index values, could be exact 32 bits. + * Currently no need for signed duk_arridx_t. + */ +typedef duk_uint_t duk_uarridx_t; +#define DUK_UARRIDX_MIN DUK_UINT_MIN +#define DUK_UARRIDX_MAX DUK_UINT_MAX + +/* Duktape/C function return value, platform int is enough for now to + * represent 0, 1, or negative error code. Must be compatible with + * assigning truth values (e.g. duk_ret_t rc = (foo == bar);). + */ +typedef duk_small_int_t duk_ret_t; +#define DUK_RET_MIN DUK_SMALL_INT_MIN +#define DUK_RET_MAX DUK_SMALL_INT_MAX + +/* Error codes are represented with platform int. High bits are used + * for flags and such, so 32 bits are needed. + */ +typedef duk_int_t duk_errcode_t; +#define DUK_ERRCODE_MIN DUK_INT_MIN +#define DUK_ERRCODE_MAX DUK_INT_MAX + +/* Codepoint type. Must be 32 bits or more because it is used also for + * internal codepoints. The type is signed because negative codepoints + * are used as internal markers (e.g. to mark EOF or missing argument). + * (X)UTF-8/CESU-8 encode/decode take and return an unsigned variant to + * ensure duk_uint32_t casts back and forth nicely. Almost everything + * else uses the signed one. + */ +typedef duk_int_t duk_codepoint_t; +typedef duk_uint_t duk_ucodepoint_t; +#define DUK_CODEPOINT_MIN DUK_INT_MIN +#define DUK_CODEPOINT_MAX DUK_INT_MAX +#define DUK_UCODEPOINT_MIN DUK_UINT_MIN +#define DUK_UCODEPOINT_MAX DUK_UINT_MAX + +/* IEEE float/double typedef. */ +typedef float duk_float_t; +typedef double duk_double_t; + +/* We're generally assuming that we're working on a platform with a 32-bit + * address space. If DUK_SIZE_MAX is a typecast value (which is necessary + * if SIZE_MAX is missing), the check must be avoided because the + * preprocessor can't do a comparison. + */ +#if !defined(DUK_SIZE_MAX) +#error DUK_SIZE_MAX is undefined, probably missing SIZE_MAX +#elif !defined(DUK_SIZE_MAX_COMPUTED) +#if DUK_SIZE_MAX < 0xffffffffUL +/* On some systems SIZE_MAX can be smaller than max unsigned 32-bit value + * which seems incorrect if size_t is (at least) an unsigned 32-bit type. + * However, it doesn't seem useful to error out compilation if this is the + * case. + */ +#endif +#endif + +/* Type used in public API declarations and user code. Typedef maps to + * 'struct duk_hthread' like the 'duk_hthread' typedef which is used + * exclusively in internals. + */ +typedef struct duk_hthread duk_context; + +/* Check whether we should use 64-bit integers or not. + * + * Quite incomplete now. Use 64-bit types if detected (C99 or other detection) + * unless they are known to be unreliable. For instance, 64-bit types are + * available on VBCC but seem to misbehave. + */ +#if defined(DUK_F_HAVE_64BIT) && !defined(DUK_F_VBCC) +#define DUK_USE_64BIT_OPS +#else +#undef DUK_USE_64BIT_OPS +#endif + +/* + * Fill-ins for platform, architecture, and compiler + */ + +/* An abort()-like primitive is needed by the default fatal error handler. */ +#if !defined(DUK_ABORT) +#define DUK_ABORT abort +#endif + +#if !defined(DUK_SETJMP) +#define DUK_JMPBUF_TYPE jmp_buf +#define DUK_SETJMP(jb) setjmp((jb)) +#define DUK_LONGJMP(jb) longjmp((jb), 1) +#endif + +#if 0 +/* sigsetjmp() alternative */ +#define DUK_JMPBUF_TYPE sigjmp_buf +#define DUK_SETJMP(jb) sigsetjmp((jb)) +#define DUK_LONGJMP(jb) siglongjmp((jb), 1) +#endif + +/* Special naming to avoid conflict with e.g. DUK_FREE() in duk_heap.h + * (which is unfortunately named). May sometimes need replacement, e.g. + * some compilers don't handle zero length or NULL correctly in realloc(). + */ +#if !defined(DUK_ANSI_MALLOC) +#define DUK_ANSI_MALLOC malloc +#endif +#if !defined(DUK_ANSI_REALLOC) +#define DUK_ANSI_REALLOC realloc +#endif +#if !defined(DUK_ANSI_CALLOC) +#define DUK_ANSI_CALLOC calloc +#endif +#if !defined(DUK_ANSI_FREE) +#define DUK_ANSI_FREE free +#endif + +/* ANSI C (various versions) and some implementations require that the + * pointer arguments to memset(), memcpy(), and memmove() be valid values + * even when byte size is 0 (even a NULL pointer is considered invalid in + * this context). Zero-size operations as such are allowed, as long as their + * pointer arguments point to a valid memory area. The DUK_MEMSET(), + * DUK_MEMCPY(), and DUK_MEMMOVE() macros require this same behavior, i.e.: + * (1) pointers must be valid and non-NULL, (2) zero size must otherwise be + * allowed. If these are not fulfilled, a macro wrapper is needed. + * + * http://stackoverflow.com/questions/5243012/is-it-guaranteed-to-be-safe-to-perform-memcpy0-0-0 + * http://lists.cs.uiuc.edu/pipermail/llvmdev/2007-October/011065.html + * + * Not sure what's the required behavior when a pointer points just past the + * end of a buffer, which often happens in practice (e.g. zero size memmoves). + * For example, if allocation size is 3, the following pointer would not + * technically point to a valid memory byte: + * + * <-- alloc --> + * | 0 | 1 | 2 | ..... + * ^-- p=3, points after last valid byte (2) + */ +#if !defined(DUK_MEMCPY) +#if defined(DUK_F_UCLIBC) +/* Old uclibcs have a broken memcpy so use memmove instead (this is overly wide + * now on purpose): http://lists.uclibc.org/pipermail/uclibc-cvs/2008-October/025511.html + */ +#define DUK_MEMCPY memmove +#else +#define DUK_MEMCPY memcpy +#endif +#endif +#if !defined(DUK_MEMMOVE) +#define DUK_MEMMOVE memmove +#endif +#if !defined(DUK_MEMCMP) +#define DUK_MEMCMP memcmp +#endif +#if !defined(DUK_MEMSET) +#define DUK_MEMSET memset +#endif +#if !defined(DUK_STRLEN) +#define DUK_STRLEN strlen +#endif +#if !defined(DUK_STRCMP) +#define DUK_STRCMP strcmp +#endif +#if !defined(DUK_STRNCMP) +#define DUK_STRNCMP strncmp +#endif +#if !defined(DUK_SPRINTF) +#define DUK_SPRINTF sprintf +#endif +#if !defined(DUK_SNPRINTF) +/* snprintf() is technically not part of C89 but usually available. */ +#define DUK_SNPRINTF snprintf +#endif +#if !defined(DUK_VSPRINTF) +#define DUK_VSPRINTF vsprintf +#endif +#if !defined(DUK_VSNPRINTF) +/* vsnprintf() is technically not part of C89 but usually available. */ +#define DUK_VSNPRINTF vsnprintf +#endif +#if !defined(DUK_SSCANF) +#define DUK_SSCANF sscanf +#endif +#if !defined(DUK_VSSCANF) +#define DUK_VSSCANF vsscanf +#endif +#if !defined(DUK_MEMZERO) +#define DUK_MEMZERO(p,n) DUK_MEMSET((p), 0, (n)) +#endif + +#if !defined(DUK_DOUBLE_INFINITY) +#undef DUK_USE_COMPUTED_INFINITY +#if defined(DUK_F_GCC_VERSION) && (DUK_F_GCC_VERSION < 40600) +/* GCC older than 4.6: avoid overflow warnings related to using INFINITY */ +#define DUK_DOUBLE_INFINITY (__builtin_inf()) +#elif defined(INFINITY) +#define DUK_DOUBLE_INFINITY ((double) INFINITY) +#elif !defined(DUK_F_VBCC) && !defined(DUK_F_MSVC) && !defined(DUK_F_BCC) && \ + !defined(DUK_F_OLD_SOLARIS) && !defined(DUK_F_AIX) +#define DUK_DOUBLE_INFINITY (1.0 / 0.0) +#else +/* In VBCC (1.0 / 0.0) results in a warning and 0.0 instead of infinity. + * Use a computed infinity (initialized when a heap is created at the + * latest). + */ +#define DUK_USE_COMPUTED_INFINITY +#define DUK_DOUBLE_INFINITY duk_computed_infinity +#endif +#endif + +#if !defined(DUK_DOUBLE_NAN) +#undef DUK_USE_COMPUTED_NAN +#if defined(NAN) +#define DUK_DOUBLE_NAN NAN +#elif !defined(DUK_F_VBCC) && !defined(DUK_F_MSVC) && !defined(DUK_F_BCC) && \ + !defined(DUK_F_OLD_SOLARIS) && !defined(DUK_F_AIX) +#define DUK_DOUBLE_NAN (0.0 / 0.0) +#else +/* In VBCC (0.0 / 0.0) results in a warning and 0.0 instead of NaN. + * In MSVC (VS2010 Express) (0.0 / 0.0) results in a compile error. + * Use a computed NaN (initialized when a heap is created at the + * latest). + */ +#define DUK_USE_COMPUTED_NAN +#define DUK_DOUBLE_NAN duk_computed_nan +#endif +#endif + +/* Many platforms are missing fpclassify() and friends, so use replacements + * if necessary. The replacement constants (FP_NAN etc) can be anything but + * match Linux constants now. + */ +#undef DUK_USE_REPL_FPCLASSIFY +#undef DUK_USE_REPL_SIGNBIT +#undef DUK_USE_REPL_ISFINITE +#undef DUK_USE_REPL_ISNAN +#undef DUK_USE_REPL_ISINF + +/* Complex condition broken into separate parts. */ +#undef DUK_F_USE_REPL_ALL +#if !(defined(FP_NAN) && defined(FP_INFINITE) && defined(FP_ZERO) && \ + defined(FP_SUBNORMAL) && defined(FP_NORMAL)) +/* Missing some obvious constants. */ +#define DUK_F_USE_REPL_ALL +#elif defined(DUK_F_AMIGAOS) && defined(DUK_F_VBCC) +/* VBCC is missing the built-ins even in C99 mode (perhaps a header issue). */ +#define DUK_F_USE_REPL_ALL +#elif defined(DUK_F_AMIGAOS) && defined(DUK_F_M68K) +/* AmigaOS + M68K seems to have math issues even when using GCC cross + * compilation. Use replacements for all AmigaOS versions on M68K + * regardless of compiler. + */ +#define DUK_F_USE_REPL_ALL +#elif defined(DUK_F_FREEBSD) && defined(DUK_F_CLANG) +/* Placeholder fix for (detection is wider than necessary): + * http://llvm.org/bugs/show_bug.cgi?id=17788 + */ +#define DUK_F_USE_REPL_ALL +#elif defined(DUK_F_UCLIBC) +/* At least some uclibc versions have broken floating point math. For + * example, fpclassify() can incorrectly classify certain NaN formats. + * To be safe, use replacements. + */ +#define DUK_F_USE_REPL_ALL +#elif defined(DUK_F_AIX) +/* Older versions may be missing isnan(), etc. */ +#define DUK_F_USE_REPL_ALL +#endif + +#if defined(DUK_F_USE_REPL_ALL) +#define DUK_USE_REPL_FPCLASSIFY +#define DUK_USE_REPL_SIGNBIT +#define DUK_USE_REPL_ISFINITE +#define DUK_USE_REPL_ISNAN +#define DUK_USE_REPL_ISINF +#define DUK_FPCLASSIFY duk_repl_fpclassify +#define DUK_SIGNBIT duk_repl_signbit +#define DUK_ISFINITE duk_repl_isfinite +#define DUK_ISNAN duk_repl_isnan +#define DUK_ISINF duk_repl_isinf +#define DUK_FP_NAN 0 +#define DUK_FP_INFINITE 1 +#define DUK_FP_ZERO 2 +#define DUK_FP_SUBNORMAL 3 +#define DUK_FP_NORMAL 4 +#else +#define DUK_FPCLASSIFY fpclassify +#define DUK_SIGNBIT signbit +#define DUK_ISFINITE isfinite +#define DUK_ISNAN isnan +#define DUK_ISINF isinf +#define DUK_FP_NAN FP_NAN +#define DUK_FP_INFINITE FP_INFINITE +#define DUK_FP_ZERO FP_ZERO +#define DUK_FP_SUBNORMAL FP_SUBNORMAL +#define DUK_FP_NORMAL FP_NORMAL +#endif + +#if defined(DUK_F_USE_REPL_ALL) +#undef DUK_F_USE_REPL_ALL +#endif + +/* These functions don't currently need replacement but are wrapped for + * completeness. Because these are used as function pointers, they need + * to be defined as concrete C functions (not macros). + */ +#if !defined(DUK_FABS) +#define DUK_FABS fabs +#endif +#if !defined(DUK_FLOOR) +#define DUK_FLOOR floor +#endif +#if !defined(DUK_CEIL) +#define DUK_CEIL ceil +#endif +#if !defined(DUK_FMOD) +#define DUK_FMOD fmod +#endif +#if !defined(DUK_POW) +#define DUK_POW pow +#endif +#if !defined(DUK_ACOS) +#define DUK_ACOS acos +#endif +#if !defined(DUK_ASIN) +#define DUK_ASIN asin +#endif +#if !defined(DUK_ATAN) +#define DUK_ATAN atan +#endif +#if !defined(DUK_ATAN2) +#define DUK_ATAN2 atan2 +#endif +#if !defined(DUK_SIN) +#define DUK_SIN sin +#endif +#if !defined(DUK_COS) +#define DUK_COS cos +#endif +#if !defined(DUK_TAN) +#define DUK_TAN tan +#endif +#if !defined(DUK_EXP) +#define DUK_EXP exp +#endif +#if !defined(DUK_LOG) +#define DUK_LOG log +#endif +#if !defined(DUK_SQRT) +#define DUK_SQRT sqrt +#endif + +/* The functions below exist only in C99/C++11 or later and need a workaround + * for platforms that don't include them. MSVC isn't detected as C99, but + * these functions also exist in MSVC 2013 and later so include a clause for + * that too. Android doesn't have log2; disable all of these for Android. + */ +#if (defined(DUK_F_C99) || defined(DUK_F_CPP11) || (defined(_MSC_VER) && (_MSC_VER >= 1800))) && \ + !defined(DUK_F_ANDROID) && !defined(DUK_F_MINT) +#if !defined(DUK_CBRT) +#define DUK_CBRT cbrt +#endif +#if !defined(DUK_LOG2) +#define DUK_LOG2 log2 +#endif +#if !defined(DUK_LOG10) +#define DUK_LOG10 log10 +#endif +#if !defined(DUK_TRUNC) +#define DUK_TRUNC trunc +#endif +#endif /* DUK_F_C99 etc */ + +/* NetBSD 6.0 x86 (at least) has a few problems with pow() semantics, + * see test-bug-netbsd-math-pow.js. MinGW has similar (but different) + * issues, see test-bug-mingw-math-issues.js. Enable pow() workarounds + * for these targets. + */ +#undef DUK_USE_POW_WORKAROUNDS +#if defined(DUK_F_NETBSD) || defined(DUK_F_MINGW) +#define DUK_USE_POW_WORKAROUNDS +#endif + +/* Similar workarounds for atan2() semantics issues. MinGW issues are + * documented in test-bug-mingw-math-issues.js. + */ +#undef DUK_USE_ATAN2_WORKAROUNDS +#if defined(DUK_F_MINGW) +#define DUK_USE_ATAN2_WORKAROUNDS +#endif + +/* Rely as little as possible on compiler behavior for NaN comparison, + * signed zero handling, etc. Currently never activated but may be needed + * for broken compilers. + */ +#undef DUK_USE_PARANOID_MATH + +/* There was a curious bug where test-bi-date-canceling.js would fail e.g. + * on 64-bit Ubuntu, gcc-4.8.1, -m32, and no -std=c99. Some date computations + * using doubles would be optimized which then broke some corner case tests. + * The problem goes away by adding 'volatile' to the datetime computations. + * Not sure what the actual triggering conditions are, but using this on + * non-C99 systems solves the known issues and has relatively little cost + * on other platforms. + */ +#undef DUK_USE_PARANOID_DATE_COMPUTATION +#if !defined(DUK_F_C99) +#define DUK_USE_PARANOID_DATE_COMPUTATION +#endif + +/* + * Byte order and double memory layout detection + * + * Endianness detection is a major portability hassle because the macros + * and headers are not standardized. There's even variance across UNIX + * platforms. Even with "standard" headers, details like underscore count + * varies between platforms, e.g. both __BYTE_ORDER and _BYTE_ORDER are used + * (Crossbridge has a single underscore, for instance). + * + * The checks below are structured with this in mind: several approaches are + * used, and at the end we check if any of them worked. This allows generic + * approaches to be tried first, and platform/compiler specific hacks tried + * last. As a last resort, the user can force a specific endianness, as it's + * not likely that automatic detection will work on the most exotic platforms. + * + * Duktape supports little and big endian machines. There's also support + * for a hybrid used by some ARM machines where integers are little endian + * but IEEE double values use a mixed order (12345678 -> 43218765). This + * byte order for doubles is referred to as "mixed endian". + */ + +/* GCC and Clang provide endianness defines as built-in predefines, with + * leading and trailing double underscores (e.g. __BYTE_ORDER__). See + * output of "make gccpredefs" and "make clangpredefs". Clang doesn't + * seem to provide __FLOAT_WORD_ORDER__; assume not mixed endian for clang. + * http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html + */ +#if !defined(DUK_USE_BYTEORDER) && defined(__BYTE_ORDER__) +#if defined(__ORDER_LITTLE_ENDIAN__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) +#if defined(__FLOAT_WORD_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && (__FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__) +#define DUK_USE_BYTEORDER 1 +#elif defined(__FLOAT_WORD_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && (__FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__) +#define DUK_USE_BYTEORDER 2 +#elif !defined(__FLOAT_WORD_ORDER__) +/* Float word order not known, assume not a hybrid. */ +#define DUK_USE_BYTEORDER 1 +#else +/* Byte order is little endian but cannot determine IEEE double word order. */ +#endif /* float word order */ +#elif defined(__ORDER_BIG_ENDIAN__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) +#if defined(__FLOAT_WORD_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && (__FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__) +#define DUK_USE_BYTEORDER 3 +#elif !defined(__FLOAT_WORD_ORDER__) +/* Float word order not known, assume not a hybrid. */ +#define DUK_USE_BYTEORDER 3 +#else +/* Byte order is big endian but cannot determine IEEE double word order. */ +#endif /* float word order */ +#else +/* Cannot determine byte order; __ORDER_PDP_ENDIAN__ is related to 32-bit + * integer ordering and is not relevant. + */ +#endif /* integer byte order */ +#endif /* !defined(DUK_USE_BYTEORDER) && defined(__BYTE_ORDER__) */ + +/* More or less standard endianness predefines provided by header files. + * The ARM hybrid case is detected by assuming that __FLOAT_WORD_ORDER + * will be big endian, see: http://lists.mysql.com/internals/443. + * On some platforms some defines may be present with an empty value which + * causes comparisons to fail: https://github.com/svaarala/duktape/issues/453. + */ +#if !defined(DUK_USE_BYTEORDER) +#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && (__BYTE_ORDER == __LITTLE_ENDIAN) || \ + defined(_BYTE_ORDER) && defined(_LITTLE_ENDIAN) && (_BYTE_ORDER == _LITTLE_ENDIAN) || \ + defined(__LITTLE_ENDIAN__) +#if defined(__FLOAT_WORD_ORDER) && defined(__LITTLE_ENDIAN) && (__FLOAT_WORD_ORDER == __LITTLE_ENDIAN) || \ + defined(_FLOAT_WORD_ORDER) && defined(_LITTLE_ENDIAN) && (_FLOAT_WORD_ORDER == _LITTLE_ENDIAN) +#define DUK_USE_BYTEORDER 1 +#elif defined(__FLOAT_WORD_ORDER) && defined(__BIG_ENDIAN) && (__FLOAT_WORD_ORDER == __BIG_ENDIAN) || \ + defined(_FLOAT_WORD_ORDER) && defined(_BIG_ENDIAN) && (_FLOAT_WORD_ORDER == _BIG_ENDIAN) +#define DUK_USE_BYTEORDER 2 +#elif !defined(__FLOAT_WORD_ORDER) && !defined(_FLOAT_WORD_ORDER) +/* Float word order not known, assume not a hybrid. */ +#define DUK_USE_BYTEORDER 1 +#else +/* Byte order is little endian but cannot determine IEEE double word order. */ +#endif /* float word order */ +#elif defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && (__BYTE_ORDER == __BIG_ENDIAN) || \ + defined(_BYTE_ORDER) && defined(_BIG_ENDIAN) && (_BYTE_ORDER == _BIG_ENDIAN) || \ + defined(__BIG_ENDIAN__) +#if defined(__FLOAT_WORD_ORDER) && defined(__BIG_ENDIAN) && (__FLOAT_WORD_ORDER == __BIG_ENDIAN) || \ + defined(_FLOAT_WORD_ORDER) && defined(_BIG_ENDIAN) && (_FLOAT_WORD_ORDER == _BIG_ENDIAN) +#define DUK_USE_BYTEORDER 3 +#elif !defined(__FLOAT_WORD_ORDER) && !defined(_FLOAT_WORD_ORDER) +/* Float word order not known, assume not a hybrid. */ +#define DUK_USE_BYTEORDER 3 +#else +/* Byte order is big endian but cannot determine IEEE double word order. */ +#endif /* float word order */ +#else +/* Cannot determine byte order. */ +#endif /* integer byte order */ +#endif /* !defined(DUK_USE_BYTEORDER) */ + +/* QNX gcc cross compiler seems to define e.g. __LITTLEENDIAN__ or __BIGENDIAN__: + * $ /opt/qnx650/host/linux/x86/usr/bin/i486-pc-nto-qnx6.5.0-gcc -dM -E - </dev/null | grep -ni endian + * 67:#define __LITTLEENDIAN__ 1 + * $ /opt/qnx650/host/linux/x86/usr/bin/mips-unknown-nto-qnx6.5.0-gcc -dM -E - </dev/null | grep -ni endian + * 81:#define __BIGENDIAN__ 1 + * $ /opt/qnx650/host/linux/x86/usr/bin/arm-unknown-nto-qnx6.5.0-gcc -dM -E - </dev/null | grep -ni endian + * 70:#define __LITTLEENDIAN__ 1 + */ +#if !defined(DUK_USE_BYTEORDER) +#if defined(__LITTLEENDIAN__) +#define DUK_USE_BYTEORDER 1 +#elif defined(__BIGENDIAN__) +#define DUK_USE_BYTEORDER 3 +#endif +#endif + +/* + * Alignment requirement and support for unaligned accesses + * + * Assume unaligned accesses are not supported unless specifically allowed + * in the target platform. Some platforms may support unaligned accesses + * but alignment to 4 or 8 may still be desirable. Note that unaligned + * accesses (and even pointers) relative to natural alignment (regardless + * of target alignment) are technically undefined behavior and thus + * compiler/architecture specific. + */ + +/* If not forced, use safe default for alignment. */ +#if !defined(DUK_USE_ALIGN_BY) +#define DUK_USE_ALIGN_BY 8 +#endif + +/* Compiler specific hackery needed to force struct size to match aligment, + * see e.g. duk_hbuffer.h. + * + * http://stackoverflow.com/questions/11130109/c-struct-size-alignment + * http://stackoverflow.com/questions/10951039/specifying-64-bit-alignment + */ +#if !(defined(DUK_USE_PACK_MSVC_PRAGMA) || defined(DUK_USE_PACK_GCC_ATTR) || \ + defined(DUK_USE_PACK_CLANG_ATTR) || defined(DUK_USE_PACK_DUMMY_MEMBER)) +#define DUK_USE_PACK_DUMMY_MEMBER +#endif + +#if !defined(DUK_VA_COPY) +/* We need va_copy() which is defined in C99 / C++11, so an awkward + * replacement is needed for pre-C99 / pre-C++11 environments. This + * will quite likely need portability hacks for some non-C99 + * environments. + */ +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +/* C99 / C++11 and above: rely on va_copy() which is required. + * Omit parenthesis on macro right side on purpose to minimize differences + * to direct use. + */ +#define DUK_VA_COPY(dest,src) va_copy(dest,src) +#else +/* Pre-C99: va_list type is implementation dependent. This replacement + * assumes it is a plain value so that a simple assignment will work. + * This is not the case on all platforms (it may be a single-array element, + * for instance). + */ +#define DUK_VA_COPY(dest,src) do { (dest) = (src); } while (0) +#endif +#endif + +#if !defined(DUK_MACRO_STRINGIFY) +/* Macro hackery to convert e.g. __LINE__ to a string without formatting, + * see: http://stackoverflow.com/questions/240353/convert-a-preprocessor-token-to-a-string + */ +#define DUK_MACRO_STRINGIFY_HELPER(x) #x +#define DUK_MACRO_STRINGIFY(x) DUK_MACRO_STRINGIFY_HELPER(x) +#endif + +#if !defined(DUK_CAUSE_SEGFAULT) +/* This can be used for testing; valgrind will then indicate the C call stack + * leading to the call site. + */ +#define DUK_CAUSE_SEGFAULT() do { *((volatile duk_uint32_t *) NULL) = (duk_uint32_t) 0xdeadbeefUL; } while (0) +#endif + +#if !defined(DUK_UNREF) +/* Macro for suppressing warnings for potentially unreferenced variables. + * The variables can be actually unreferenced or unreferenced in some + * specific cases only; for instance, if a variable is only debug printed, + * it is unreferenced when debug printing is disabled. May cause warnings + * for volatile arguments. + */ +#define DUK_UNREF(x) do { (void) (x); } while (0) +#endif + +/* Fillin for DUK_NORETURN; DUK_WO_NORETURN() is used to insert dummy + * dummy statements after noreturn calls to silence harmless compiler + * warnings, e.g.: + * + * DUK_ERROR_TYPE(thr, "aiee"); + * DUK_WO_NORETURN(return 0;); + * + * Statements inside DUK_WO_NORETURN() must NEVER be actually reachable, + * and they're only included to satisfy the compiler. + */ +#if defined(DUK_NORETURN) +#define DUK_WO_NORETURN(stmt) do { } while (0) +#else +#define DUK_NORETURN(decl) decl +#define DUK_WO_NORETURN(stmt) do { stmt } while (0) +#endif + +#if !defined(DUK_UNREACHABLE) +/* Don't know how to declare unreachable point, so don't do it; this + * may cause some spurious compilation warnings (e.g. "variable used + * uninitialized"). + */ +#define DUK_UNREACHABLE() do { } while (0) +#endif + +#if !defined(DUK_LOSE_CONST) +/* Convert any input pointer into a "void *", losing a const qualifier. + * This is not fully portable because casting through duk_uintptr_t may + * not work on all architectures (e.g. those with long, segmented pointers). + */ +#define DUK_LOSE_CONST(src) ((void *) (duk_uintptr_t) (src)) +#endif + +#if !defined(DUK_LIKELY) +#define DUK_LIKELY(x) (x) +#endif +#if !defined(DUK_UNLIKELY) +#define DUK_UNLIKELY(x) (x) +#endif +#if !defined(DUK_UNPREDICTABLE) +#define DUK_UNPREDICTABLE(x) (x) +#endif + +#if !defined(DUK_NOINLINE) +#define DUK_NOINLINE /*nop*/ +#endif +#if !defined(DUK_INLINE) +#define DUK_INLINE /*nop*/ +#endif +#if !defined(DUK_ALWAYS_INLINE) +#define DUK_ALWAYS_INLINE /*nop*/ +#endif + +#if !defined(DUK_HOT) +#define DUK_HOT /*nop*/ +#endif +#if !defined(DUK_COLD) +#define DUK_COLD /*nop*/ +#endif + +#if !defined(DUK_EXTERNAL_DECL) +#define DUK_EXTERNAL_DECL extern +#endif +#if !defined(DUK_EXTERNAL) +#define DUK_EXTERNAL /*empty*/ +#endif +#if !defined(DUK_INTERNAL_DECL) +#if defined(DUK_SINGLE_FILE) +#define DUK_INTERNAL_DECL static +#else +#define DUK_INTERNAL_DECL extern +#endif +#endif +#if !defined(DUK_INTERNAL) +#if defined(DUK_SINGLE_FILE) +#define DUK_INTERNAL static +#else +#define DUK_INTERNAL /*empty*/ +#endif +#endif +#if !defined(DUK_LOCAL_DECL) +#define DUK_LOCAL_DECL static +#endif +#if !defined(DUK_LOCAL) +#define DUK_LOCAL static +#endif + +#if !defined(DUK_FILE_MACRO) +#define DUK_FILE_MACRO __FILE__ +#endif +#if !defined(DUK_LINE_MACRO) +#define DUK_LINE_MACRO __LINE__ +#endif +#if !defined(DUK_FUNC_MACRO) +#if defined(DUK_F_C99) || defined(DUK_F_CPP11) +#define DUK_FUNC_MACRO __func__ +#elif defined(__FUNCTION__) +#define DUK_FUNC_MACRO __FUNCTION__ +#else +#define DUK_FUNC_MACRO "unknown" +#endif +#endif + +#if !defined(DUK_BSWAP32) +#define DUK_BSWAP32(x) \ + ((((duk_uint32_t) (x)) >> 24) | \ + ((((duk_uint32_t) (x)) >> 8) & 0xff00UL) | \ + ((((duk_uint32_t) (x)) << 8) & 0xff0000UL) | \ + (((duk_uint32_t) (x)) << 24)) +#endif +#if !defined(DUK_BSWAP16) +#define DUK_BSWAP16(x) \ + ((duk_uint16_t) (x) >> 8) | \ + ((duk_uint16_t) (x) << 8) +#endif + +/* DUK_USE_VARIADIC_MACROS: required from compilers, so no fill-in. */ +/* DUK_USE_UNION_INITIALIZERS: required from compilers, so no fill-in. */ + +#if !(defined(DUK_USE_FLEX_C99) || defined(DUK_USE_FLEX_ZEROSIZE) || defined(DUK_USE_FLEX_ONESIZE)) +#if defined(DUK_F_C99) +#define DUK_USE_FLEX_C99 +#else +#define DUK_USE_FLEX_ZEROSIZE /* Not standard but common enough */ +#endif +#endif + +#if !(defined(DUK_USE_PACK_GCC_ATTR) || defined(DUK_USE_PACK_CLANG_ATTR) || \ + defined(DUK_USE_PACK_MSVC_PRAGMA) || defined(DUK_USE_PACK_DUMMY_MEMBER)) +#define DUK_USE_PACK_DUMMY_MEMBER +#endif + +#if 0 /* not defined by default */ +#undef DUK_USE_GCC_PRAGMAS +#endif + +#if !defined(DUK_U64_CONSTANT) +#define DUK_U64_CONSTANT(x) x##ULL +#endif +#if !defined(DUK_I64_CONSTANT) +#define DUK_I64_CONSTANT(x) x##LL +#endif + +/* Workaround for GH-323: avoid inlining control when compiling from + * multiple sources, as it causes compiler portability trouble. + */ +#if !defined(DUK_SINGLE_FILE) +#undef DUK_NOINLINE +#undef DUK_INLINE +#undef DUK_ALWAYS_INLINE +#define DUK_NOINLINE /*nop*/ +#define DUK_INLINE /*nop*/ +#define DUK_ALWAYS_INLINE /*nop*/ +#endif + +/* + * Check whether or not a packed duk_tval representation is possible. + * What's basically required is that pointers are 32-bit values + * (sizeof(void *) == 4). Best effort check, not always accurate. + * If guess goes wrong, crashes may result; self tests also verify + * the guess. + */ + +/* Explicit marker needed; may be 'defined', 'undefined, 'or 'not provided'. */ +#if !defined(DUK_F_PACKED_TVAL_PROVIDED) +#undef DUK_F_PACKED_TVAL_POSSIBLE + +/* Strict C99 case: DUK_UINTPTR_MAX (= UINTPTR_MAX) should be very reliable */ +#if !defined(DUK_F_PACKED_TVAL_POSSIBLE) && defined(DUK_UINTPTR_MAX) +#if (DUK_UINTPTR_MAX <= 0xffffffffUL) +#define DUK_F_PACKED_TVAL_POSSIBLE +#endif +#endif + +/* Non-C99 case, still relying on DUK_UINTPTR_MAX, as long as it is not a computed value */ +#if !defined(DUK_F_PACKED_TVAL_POSSIBLE) && defined(DUK_UINTPTR_MAX) && !defined(DUK_UINTPTR_MAX_COMPUTED) +#if (DUK_UINTPTR_MAX <= 0xffffffffUL) +#define DUK_F_PACKED_TVAL_POSSIBLE +#endif +#endif + +/* DUK_SIZE_MAX (= SIZE_MAX) is often reliable */ +#if !defined(DUK_F_PACKED_TVAL_POSSIBLE) && defined(DUK_SIZE_MAX) && !defined(DUK_SIZE_MAX_COMPUTED) +#if (DUK_SIZE_MAX <= 0xffffffffUL) +#define DUK_F_PACKED_TVAL_POSSIBLE +#endif +#endif + +#undef DUK_USE_PACKED_TVAL +#if defined(DUK_F_PACKED_TVAL_POSSIBLE) +#define DUK_USE_PACKED_TVAL +#endif +#undef DUK_F_PACKED_TVAL_POSSIBLE + +#endif /* DUK_F_PACKED_TVAL_PROVIDED */ +/* Object property allocation layout has implications for memory and code + * footprint and generated code size/speed. The best layout also depends + * on whether the platform has alignment requirements or benefits from + * having mostly aligned accesses. + */ +#undef DUK_USE_HOBJECT_LAYOUT_1 +#undef DUK_USE_HOBJECT_LAYOUT_2 +#undef DUK_USE_HOBJECT_LAYOUT_3 +#if (DUK_USE_ALIGN_BY == 1) +/* On platforms without any alignment issues, layout 1 is preferable + * because it compiles to slightly less code and provides direct access + * to property keys. + */ +#define DUK_USE_HOBJECT_LAYOUT_1 +#else +/* On other platforms use layout 2, which requires some padding but + * is a bit more natural than layout 3 in ordering the entries. Layout + * 3 is currently not used. + */ +#define DUK_USE_HOBJECT_LAYOUT_2 +#endif + +/* GCC/clang inaccurate math would break compliance and probably duk_tval, + * so refuse to compile. Relax this if -ffast-math is tested to work. + */ +#if defined(__FAST_MATH__) +#error __FAST_MATH__ defined, refusing to compile +#endif + +/* + * Autogenerated defaults + */ + +#undef DUK_USE_ALLOW_UNDEFINED_BEHAVIOR +#define DUK_USE_ARRAY_BUILTIN +#define DUK_USE_ARRAY_FASTPATH +#define DUK_USE_ARRAY_PROP_FASTPATH +#undef DUK_USE_ASSERTIONS +#define DUK_USE_AUGMENT_ERROR_CREATE +#define DUK_USE_AUGMENT_ERROR_THROW +#define DUK_USE_AVOID_PLATFORM_FUNCPTRS +#define DUK_USE_BASE64_FASTPATH +#define DUK_USE_BASE64_SUPPORT +#define DUK_USE_BOOLEAN_BUILTIN +#define DUK_USE_BUFFEROBJECT_SUPPORT +#undef DUK_USE_BUFLEN16 +#define DUK_USE_BYTECODE_DUMP_SUPPORT +#define DUK_USE_CACHE_ACTIVATION +#define DUK_USE_CACHE_CATCHER +#define DUK_USE_CALLSTACK_LIMIT 10000 +#define DUK_USE_COMMONJS_MODULES +#define DUK_USE_COMPILER_RECLIMIT 2500 +#define DUK_USE_COROUTINE_SUPPORT +#undef DUK_USE_CPP_EXCEPTIONS +#undef DUK_USE_DATAPTR16 +#undef DUK_USE_DATAPTR_DEC16 +#undef DUK_USE_DATAPTR_ENC16 +#define DUK_USE_DATE_BUILTIN +#undef DUK_USE_DATE_FORMAT_STRING +#undef DUK_USE_DATE_GET_LOCAL_TZOFFSET +#undef DUK_USE_DATE_GET_NOW +#undef DUK_USE_DATE_PARSE_STRING +#undef DUK_USE_DATE_PRS_GETDATE +#undef DUK_USE_DEBUG +#undef DUK_USE_DEBUGGER_DUMPHEAP +#undef DUK_USE_DEBUGGER_INSPECT +#undef DUK_USE_DEBUGGER_PAUSE_UNCAUGHT +#undef DUK_USE_DEBUGGER_SUPPORT +#define DUK_USE_DEBUGGER_THROW_NOTIFY +#undef DUK_USE_DEBUGGER_TRANSPORT_TORTURE +#define DUK_USE_DEBUG_BUFSIZE 65536L +#define DUK_USE_DEBUG_LEVEL 0 +#undef DUK_USE_DEBUG_WRITE +#define DUK_USE_DOUBLE_LINKED_HEAP +#define DUK_USE_DUKTAPE_BUILTIN +#define DUK_USE_ENCODING_BUILTINS +#define DUK_USE_ERRCREATE +#define DUK_USE_ERRTHROW +#define DUK_USE_ES6 +#define DUK_USE_ES6_OBJECT_PROTO_PROPERTY +#define DUK_USE_ES6_OBJECT_SETPROTOTYPEOF +#define DUK_USE_ES6_PROXY +#define DUK_USE_ES6_REGEXP_SYNTAX +#define DUK_USE_ES6_UNICODE_ESCAPE +#define DUK_USE_ES7 +#define DUK_USE_ES7_EXP_OPERATOR +#define DUK_USE_ES8 +#define DUK_USE_ES9 +#define DUK_USE_ESBC_LIMITS +#define DUK_USE_ESBC_MAX_BYTES 2147418112L +#define DUK_USE_ESBC_MAX_LINENUMBER 2147418112L +#undef DUK_USE_EXEC_FUN_LOCAL +#undef DUK_USE_EXEC_INDIRECT_BOUND_CHECK +#undef DUK_USE_EXEC_PREFER_SIZE +#define DUK_USE_EXEC_REGCONST_OPTIMIZE +#undef DUK_USE_EXEC_TIMEOUT_CHECK +#undef DUK_USE_EXPLICIT_NULL_INIT +#undef DUK_USE_EXTSTR_FREE +#undef DUK_USE_EXTSTR_INTERN_CHECK +#undef DUK_USE_FASTINT +#define DUK_USE_FAST_REFCOUNT_DEFAULT +#undef DUK_USE_FATAL_HANDLER +#define DUK_USE_FATAL_MAXLEN 128 +#define DUK_USE_FINALIZER_SUPPORT +#undef DUK_USE_FINALIZER_TORTURE +#undef DUK_USE_FUNCPTR16 +#undef DUK_USE_FUNCPTR_DEC16 +#undef DUK_USE_FUNCPTR_ENC16 +#define DUK_USE_FUNCTION_BUILTIN +#define DUK_USE_FUNC_FILENAME_PROPERTY +#define DUK_USE_FUNC_NAME_PROPERTY +#undef DUK_USE_GC_TORTURE +#undef DUK_USE_GET_MONOTONIC_TIME +#undef DUK_USE_GET_RANDOM_DOUBLE +#undef DUK_USE_GLOBAL_BINDING +#define DUK_USE_GLOBAL_BUILTIN +#undef DUK_USE_HEAPPTR16 +#undef DUK_USE_HEAPPTR_DEC16 +#undef DUK_USE_HEAPPTR_ENC16 +#define DUK_USE_HEX_FASTPATH +#define DUK_USE_HEX_SUPPORT +#define DUK_USE_HOBJECT_ARRAY_ABANDON_LIMIT 2 +#define DUK_USE_HOBJECT_ARRAY_FAST_RESIZE_LIMIT 9 +#define DUK_USE_HOBJECT_ARRAY_MINGROW_ADD 16 +#define DUK_USE_HOBJECT_ARRAY_MINGROW_DIVISOR 8 +#define DUK_USE_HOBJECT_ENTRY_MINGROW_ADD 16 +#define DUK_USE_HOBJECT_ENTRY_MINGROW_DIVISOR 8 +#define DUK_USE_HOBJECT_HASH_PART +#define DUK_USE_HOBJECT_HASH_PROP_LIMIT 8 +#define DUK_USE_HSTRING_ARRIDX +#define DUK_USE_HSTRING_CLEN +#undef DUK_USE_HSTRING_EXTDATA +#define DUK_USE_HSTRING_LAZY_CLEN +#define DUK_USE_HTML_COMMENTS +#define DUK_USE_IDCHAR_FASTPATH +#undef DUK_USE_INJECT_HEAP_ALLOC_ERROR +#undef DUK_USE_INTERRUPT_COUNTER +#undef DUK_USE_INTERRUPT_DEBUG_FIXUP +#define DUK_USE_JC +#define DUK_USE_JSON_BUILTIN +#define DUK_USE_JSON_DECNUMBER_FASTPATH +#define DUK_USE_JSON_DECSTRING_FASTPATH +#define DUK_USE_JSON_DEC_RECLIMIT 1000 +#define DUK_USE_JSON_EATWHITE_FASTPATH +#define DUK_USE_JSON_ENC_RECLIMIT 1000 +#define DUK_USE_JSON_QUOTESTRING_FASTPATH +#undef DUK_USE_JSON_STRINGIFY_FASTPATH +#define DUK_USE_JSON_SUPPORT +#define DUK_USE_JX +#define DUK_USE_LEXER_SLIDING_WINDOW +#undef DUK_USE_LIGHTFUNC_BUILTINS +#define DUK_USE_LITCACHE_SIZE 256 +#define DUK_USE_MARK_AND_SWEEP_RECLIMIT 256 +#define DUK_USE_MATH_BUILTIN +#define DUK_USE_NATIVE_CALL_RECLIMIT 1000 +#define DUK_USE_NONSTD_ARRAY_SPLICE_DELCOUNT +#undef DUK_USE_NONSTD_FUNC_CALLER_PROPERTY +#undef DUK_USE_NONSTD_FUNC_SOURCE_PROPERTY +#define DUK_USE_NONSTD_FUNC_STMT +#define DUK_USE_NONSTD_GETTER_KEY_ARGUMENT +#define DUK_USE_NONSTD_JSON_ESC_U2028_U2029 +#define DUK_USE_NONSTD_SETTER_KEY_ARGUMENT +#define DUK_USE_NONSTD_STRING_FROMCHARCODE_32BIT +#define DUK_USE_NUMBER_BUILTIN +#define DUK_USE_OBJECT_BUILTIN +#undef DUK_USE_OBJSIZES16 +#undef DUK_USE_PARANOID_ERRORS +#define DUK_USE_PC2LINE +#define DUK_USE_PERFORMANCE_BUILTIN +#undef DUK_USE_PREFER_SIZE +#undef DUK_USE_PROMISE_BUILTIN +#define DUK_USE_PROVIDE_DEFAULT_ALLOC_FUNCTIONS +#undef DUK_USE_REFCOUNT16 +#define DUK_USE_REFCOUNT32 +#define DUK_USE_REFERENCE_COUNTING +#define DUK_USE_REFLECT_BUILTIN +#define DUK_USE_REGEXP_CANON_BITMAP +#undef DUK_USE_REGEXP_CANON_WORKAROUND +#define DUK_USE_REGEXP_COMPILER_RECLIMIT 10000 +#define DUK_USE_REGEXP_EXECUTOR_RECLIMIT 10000 +#define DUK_USE_REGEXP_SUPPORT +#undef DUK_USE_ROM_GLOBAL_CLONE +#undef DUK_USE_ROM_GLOBAL_INHERIT +#undef DUK_USE_ROM_OBJECTS +#define DUK_USE_ROM_PTRCOMP_FIRST 63488L +#undef DUK_USE_ROM_STRINGS +#define DUK_USE_SECTION_B +#undef DUK_USE_SELF_TESTS +#define DUK_USE_SHEBANG_COMMENTS +#undef DUK_USE_SHUFFLE_TORTURE +#define DUK_USE_SOURCE_NONBMP +#undef DUK_USE_STRHASH16 +#undef DUK_USE_STRHASH_DENSE +#define DUK_USE_STRHASH_SKIP_SHIFT 5 +#define DUK_USE_STRICT_DECL +#undef DUK_USE_STRICT_UTF8_SOURCE +#define DUK_USE_STRING_BUILTIN +#undef DUK_USE_STRLEN16 +#define DUK_USE_STRTAB_GROW_LIMIT 17 +#define DUK_USE_STRTAB_MAXSIZE 268435456L +#define DUK_USE_STRTAB_MINSIZE 1024 +#undef DUK_USE_STRTAB_PTRCOMP +#define DUK_USE_STRTAB_RESIZE_CHECK_MASK 255 +#define DUK_USE_STRTAB_SHRINK_LIMIT 6 +#undef DUK_USE_STRTAB_TORTURE +#undef DUK_USE_SYMBOL_BUILTIN +#define DUK_USE_TAILCALL +#define DUK_USE_TARGET_INFO "unknown" +#define DUK_USE_TRACEBACKS +#define DUK_USE_TRACEBACK_DEPTH 10 +#define DUK_USE_USER_DECLARE() /* no user declarations */ +#define DUK_USE_VALSTACK_GROW_SHIFT 2 +#define DUK_USE_VALSTACK_LIMIT 1000000L +#define DUK_USE_VALSTACK_SHRINK_CHECK_SHIFT 2 +#define DUK_USE_VALSTACK_SHRINK_SLACK_SHIFT 4 +#undef DUK_USE_VALSTACK_UNSAFE +#define DUK_USE_VERBOSE_ERRORS +#define DUK_USE_VERBOSE_EXECUTOR_ERRORS +#define DUK_USE_VOLUNTARY_GC +#define DUK_USE_ZERO_BUFFER_DATA + +/* + * You may add overriding #define/#undef directives below for + * customization. You of course cannot un-#include or un-typedef + * anything; these require direct changes above. + */ + +/* __OVERRIDE_DEFINES__ */ + +/* + * Conditional includes + */ + +#if defined(DUK_F_CPP) && defined(DUK_USE_CPP_EXCEPTIONS) +#include <exception> /* std::exception */ +#include <stdexcept> /* std::runtime_error */ +#endif + +/* + * Date provider selection + * + * User may define DUK_USE_DATE_GET_NOW() etc directly, in which case we'll + * rely on an external provider. If this is not done, revert to previous + * behavior and use Unix/Windows built-in provider. + */ + +#if defined(DUK_COMPILING_DUKTAPE) + +#if defined(DUK_USE_DATE_GET_NOW) +/* External provider already defined. */ +#elif defined(DUK_USE_DATE_NOW_GETTIMEOFDAY) +#define DUK_USE_DATE_GET_NOW(ctx) duk_bi_date_get_now_gettimeofday() +#elif defined(DUK_USE_DATE_NOW_TIME) +#define DUK_USE_DATE_GET_NOW(ctx) duk_bi_date_get_now_time() +#elif defined(DUK_USE_DATE_NOW_WINDOWS) +#define DUK_USE_DATE_GET_NOW(ctx) duk_bi_date_get_now_windows() +#elif defined(DUK_USE_DATE_NOW_WINDOWS_SUBMS) +#define DUK_USE_DATE_GET_NOW(ctx) duk_bi_date_get_now_windows_subms() +#else +#error no provider for DUK_USE_DATE_GET_NOW() +#endif + +#if defined(DUK_USE_DATE_GET_LOCAL_TZOFFSET) +/* External provider already defined. */ +#elif defined(DUK_USE_DATE_TZO_GMTIME_R) || defined(DUK_USE_DATE_TZO_GMTIME_S) || defined(DUK_USE_DATE_TZO_GMTIME) +#define DUK_USE_DATE_GET_LOCAL_TZOFFSET(d) duk_bi_date_get_local_tzoffset_gmtime((d)) +#elif defined(DUK_USE_DATE_TZO_WINDOWS) +#define DUK_USE_DATE_GET_LOCAL_TZOFFSET(d) duk_bi_date_get_local_tzoffset_windows((d)) +#elif defined(DUK_USE_DATE_TZO_WINDOWS_NO_DST) +#define DUK_USE_DATE_GET_LOCAL_TZOFFSET(d) duk_bi_date_get_local_tzoffset_windows_no_dst((d)) +#else +#error no provider for DUK_USE_DATE_GET_LOCAL_TZOFFSET() +#endif + +#if defined(DUK_USE_DATE_PARSE_STRING) +/* External provider already defined. */ +#elif defined(DUK_USE_DATE_PRS_STRPTIME) +#define DUK_USE_DATE_PARSE_STRING(ctx,str) duk_bi_date_parse_string_strptime((ctx), (str)) +#elif defined(DUK_USE_DATE_PRS_GETDATE) +#define DUK_USE_DATE_PARSE_STRING(ctx,str) duk_bi_date_parse_string_getdate((ctx), (str)) +#else +/* No provider for DUK_USE_DATE_PARSE_STRING(), fall back to ISO 8601 only. */ +#endif + +#if defined(DUK_USE_DATE_FORMAT_STRING) +/* External provider already defined. */ +#elif defined(DUK_USE_DATE_FMT_STRFTIME) +#define DUK_USE_DATE_FORMAT_STRING(ctx,parts,tzoffset,flags) \ + duk_bi_date_format_parts_strftime((ctx), (parts), (tzoffset), (flags)) +#else +/* No provider for DUK_USE_DATE_FORMAT_STRING(), fall back to ISO 8601 only. */ +#endif + +#if defined(DUK_USE_GET_MONOTONIC_TIME) +/* External provider already defined. */ +#elif defined(DUK_USE_GET_MONOTONIC_TIME_CLOCK_GETTIME) +#define DUK_USE_GET_MONOTONIC_TIME(ctx) duk_bi_date_get_monotonic_time_clock_gettime() +#elif defined(DUK_USE_GET_MONOTONIC_TIME_WINDOWS_QPC) +#define DUK_USE_GET_MONOTONIC_TIME(ctx) duk_bi_date_get_monotonic_time_windows_qpc() +#else +/* No provider for DUK_USE_GET_MONOTONIC_TIME(), fall back to DUK_USE_DATE_GET_NOW(). */ +#endif + +#endif /* DUK_COMPILING_DUKTAPE */ + +/* + * Checks for legacy feature options (DUK_OPT_xxx) + */ + +#if defined(DUK_OPT_ASSERTIONS) +#error unsupported legacy feature option DUK_OPT_ASSERTIONS used +#endif +#if defined(DUK_OPT_BUFFEROBJECT_SUPPORT) +#error unsupported legacy feature option DUK_OPT_BUFFEROBJECT_SUPPORT used +#endif +#if defined(DUK_OPT_BUFLEN16) +#error unsupported legacy feature option DUK_OPT_BUFLEN16 used +#endif +#if defined(DUK_OPT_DATAPTR16) +#error unsupported legacy feature option DUK_OPT_DATAPTR16 used +#endif +#if defined(DUK_OPT_DATAPTR_DEC16) +#error unsupported legacy feature option DUK_OPT_DATAPTR_DEC16 used +#endif +#if defined(DUK_OPT_DATAPTR_ENC16) +#error unsupported legacy feature option DUK_OPT_DATAPTR_ENC16 used +#endif +#if defined(DUK_OPT_DDDPRINT) +#error unsupported legacy feature option DUK_OPT_DDDPRINT used +#endif +#if defined(DUK_OPT_DDPRINT) +#error unsupported legacy feature option DUK_OPT_DDPRINT used +#endif +#if defined(DUK_OPT_DEBUG) +#error unsupported legacy feature option DUK_OPT_DEBUG used +#endif +#if defined(DUK_OPT_DEBUGGER_DUMPHEAP) +#error unsupported legacy feature option DUK_OPT_DEBUGGER_DUMPHEAP used +#endif +#if defined(DUK_OPT_DEBUGGER_FWD_LOGGING) +#error unsupported legacy feature option DUK_OPT_DEBUGGER_FWD_LOGGING used +#endif +#if defined(DUK_OPT_DEBUGGER_FWD_PRINTALERT) +#error unsupported legacy feature option DUK_OPT_DEBUGGER_FWD_PRINTALERT used +#endif +#if defined(DUK_OPT_DEBUGGER_SUPPORT) +#error unsupported legacy feature option DUK_OPT_DEBUGGER_SUPPORT used +#endif +#if defined(DUK_OPT_DEBUGGER_TRANSPORT_TORTURE) +#error unsupported legacy feature option DUK_OPT_DEBUGGER_TRANSPORT_TORTURE used +#endif +#if defined(DUK_OPT_DEBUG_BUFSIZE) +#error unsupported legacy feature option DUK_OPT_DEBUG_BUFSIZE used +#endif +#if defined(DUK_OPT_DECLARE) +#error unsupported legacy feature option DUK_OPT_DECLARE used +#endif +#if defined(DUK_OPT_DEEP_C_STACK) +#error unsupported legacy feature option DUK_OPT_DEEP_C_STACK used +#endif +#if defined(DUK_OPT_DLL_BUILD) +#error unsupported legacy feature option DUK_OPT_DLL_BUILD used +#endif +#if defined(DUK_OPT_DPRINT) +#error unsupported legacy feature option DUK_OPT_DPRINT used +#endif +#if defined(DUK_OPT_DPRINT_COLORS) +#error unsupported legacy feature option DUK_OPT_DPRINT_COLORS used +#endif +#if defined(DUK_OPT_DPRINT_RDTSC) +#error unsupported legacy feature option DUK_OPT_DPRINT_RDTSC used +#endif +#if defined(DUK_OPT_EXEC_TIMEOUT_CHECK) +#error unsupported legacy feature option DUK_OPT_EXEC_TIMEOUT_CHECK used +#endif +#if defined(DUK_OPT_EXTERNAL_STRINGS) +#error unsupported legacy feature option DUK_OPT_EXTERNAL_STRINGS used +#endif +#if defined(DUK_OPT_EXTSTR_FREE) +#error unsupported legacy feature option DUK_OPT_EXTSTR_FREE used +#endif +#if defined(DUK_OPT_EXTSTR_INTERN_CHECK) +#error unsupported legacy feature option DUK_OPT_EXTSTR_INTERN_CHECK used +#endif +#if defined(DUK_OPT_FASTINT) +#error unsupported legacy feature option DUK_OPT_FASTINT used +#endif +#if defined(DUK_OPT_FORCE_ALIGN) +#error unsupported legacy feature option DUK_OPT_FORCE_ALIGN used +#endif +#if defined(DUK_OPT_FORCE_BYTEORDER) +#error unsupported legacy feature option DUK_OPT_FORCE_BYTEORDER used +#endif +#if defined(DUK_OPT_FUNCPTR16) +#error unsupported legacy feature option DUK_OPT_FUNCPTR16 used +#endif +#if defined(DUK_OPT_FUNCPTR_DEC16) +#error unsupported legacy feature option DUK_OPT_FUNCPTR_DEC16 used +#endif +#if defined(DUK_OPT_FUNCPTR_ENC16) +#error unsupported legacy feature option DUK_OPT_FUNCPTR_ENC16 used +#endif +#if defined(DUK_OPT_FUNC_NONSTD_CALLER_PROPERTY) +#error unsupported legacy feature option DUK_OPT_FUNC_NONSTD_CALLER_PROPERTY used +#endif +#if defined(DUK_OPT_FUNC_NONSTD_SOURCE_PROPERTY) +#error unsupported legacy feature option DUK_OPT_FUNC_NONSTD_SOURCE_PROPERTY used +#endif +#if defined(DUK_OPT_GC_TORTURE) +#error unsupported legacy feature option DUK_OPT_GC_TORTURE used +#endif +#if defined(DUK_OPT_HAVE_CUSTOM_H) +#error unsupported legacy feature option DUK_OPT_HAVE_CUSTOM_H used +#endif +#if defined(DUK_OPT_HEAPPTR16) +#error unsupported legacy feature option DUK_OPT_HEAPPTR16 used +#endif +#if defined(DUK_OPT_HEAPPTR_DEC16) +#error unsupported legacy feature option DUK_OPT_HEAPPTR_DEC16 used +#endif +#if defined(DUK_OPT_HEAPPTR_ENC16) +#error unsupported legacy feature option DUK_OPT_HEAPPTR_ENC16 used +#endif +#if defined(DUK_OPT_INTERRUPT_COUNTER) +#error unsupported legacy feature option DUK_OPT_INTERRUPT_COUNTER used +#endif +#if defined(DUK_OPT_JSON_STRINGIFY_FASTPATH) +#error unsupported legacy feature option DUK_OPT_JSON_STRINGIFY_FASTPATH used +#endif +#if defined(DUK_OPT_LIGHTFUNC_BUILTINS) +#error unsupported legacy feature option DUK_OPT_LIGHTFUNC_BUILTINS used +#endif +#if defined(DUK_OPT_NONSTD_FUNC_CALLER_PROPERTY) +#error unsupported legacy feature option DUK_OPT_NONSTD_FUNC_CALLER_PROPERTY used +#endif +#if defined(DUK_OPT_NONSTD_FUNC_SOURCE_PROPERTY) +#error unsupported legacy feature option DUK_OPT_NONSTD_FUNC_SOURCE_PROPERTY used +#endif +#if defined(DUK_OPT_NO_ARRAY_SPLICE_NONSTD_DELCOUNT) +#error unsupported legacy feature option DUK_OPT_NO_ARRAY_SPLICE_NONSTD_DELCOUNT used +#endif +#if defined(DUK_OPT_NO_AUGMENT_ERRORS) +#error unsupported legacy feature option DUK_OPT_NO_AUGMENT_ERRORS used +#endif +#if defined(DUK_OPT_NO_BROWSER_LIKE) +#error unsupported legacy feature option DUK_OPT_NO_BROWSER_LIKE used +#endif +#if defined(DUK_OPT_NO_BUFFEROBJECT_SUPPORT) +#error unsupported legacy feature option DUK_OPT_NO_BUFFEROBJECT_SUPPORT used +#endif +#if defined(DUK_OPT_NO_BYTECODE_DUMP_SUPPORT) +#error unsupported legacy feature option DUK_OPT_NO_BYTECODE_DUMP_SUPPORT used +#endif +#if defined(DUK_OPT_NO_COMMONJS_MODULES) +#error unsupported legacy feature option DUK_OPT_NO_COMMONJS_MODULES used +#endif +#if defined(DUK_OPT_NO_ES6_OBJECT_PROTO_PROPERTY) +#error unsupported legacy feature option DUK_OPT_NO_ES6_OBJECT_PROTO_PROPERTY used +#endif +#if defined(DUK_OPT_NO_ES6_OBJECT_SETPROTOTYPEOF) +#error unsupported legacy feature option DUK_OPT_NO_ES6_OBJECT_SETPROTOTYPEOF used +#endif +#if defined(DUK_OPT_NO_ES6_PROXY) +#error unsupported legacy feature option DUK_OPT_NO_ES6_PROXY used +#endif +#if defined(DUK_OPT_NO_FILE_IO) +#error unsupported legacy feature option DUK_OPT_NO_FILE_IO used +#endif +#if defined(DUK_OPT_NO_FUNC_STMT) +#error unsupported legacy feature option DUK_OPT_NO_FUNC_STMT used +#endif +#if defined(DUK_OPT_NO_JC) +#error unsupported legacy feature option DUK_OPT_NO_JC used +#endif +#if defined(DUK_OPT_NO_JSONC) +#error unsupported legacy feature option DUK_OPT_NO_JSONC used +#endif +#if defined(DUK_OPT_NO_JSONX) +#error unsupported legacy feature option DUK_OPT_NO_JSONX used +#endif +#if defined(DUK_OPT_NO_JX) +#error unsupported legacy feature option DUK_OPT_NO_JX used +#endif +#if defined(DUK_OPT_NO_MARK_AND_SWEEP) +#error unsupported legacy feature option DUK_OPT_NO_MARK_AND_SWEEP used +#endif +#if defined(DUK_OPT_NO_MS_STRINGTABLE_RESIZE) +#error unsupported legacy feature option DUK_OPT_NO_MS_STRINGTABLE_RESIZE used +#endif +#if defined(DUK_OPT_NO_NONSTD_ACCESSOR_KEY_ARGUMENT) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_ACCESSOR_KEY_ARGUMENT used +#endif +#if defined(DUK_OPT_NO_NONSTD_ARRAY_CONCAT_TRAILER) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_ARRAY_CONCAT_TRAILER used +#endif +#if defined(DUK_OPT_NO_NONSTD_ARRAY_MAP_TRAILER) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_ARRAY_MAP_TRAILER used +#endif +#if defined(DUK_OPT_NO_NONSTD_ARRAY_SPLICE_DELCOUNT) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_ARRAY_SPLICE_DELCOUNT used +#endif +#if defined(DUK_OPT_NO_NONSTD_FUNC_STMT) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_FUNC_STMT used +#endif +#if defined(DUK_OPT_NO_NONSTD_JSON_ESC_U2028_U2029) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_JSON_ESC_U2028_U2029 used +#endif +#if defined(DUK_OPT_NO_NONSTD_STRING_FROMCHARCODE_32BIT) +#error unsupported legacy feature option DUK_OPT_NO_NONSTD_STRING_FROMCHARCODE_32BIT used +#endif +#if defined(DUK_OPT_NO_OBJECT_ES6_PROTO_PROPERTY) +#error unsupported legacy feature option DUK_OPT_NO_OBJECT_ES6_PROTO_PROPERTY used +#endif +#if defined(DUK_OPT_NO_OBJECT_ES6_SETPROTOTYPEOF) +#error unsupported legacy feature option DUK_OPT_NO_OBJECT_ES6_SETPROTOTYPEOF used +#endif +#if defined(DUK_OPT_NO_OCTAL_SUPPORT) +#error unsupported legacy feature option DUK_OPT_NO_OCTAL_SUPPORT used +#endif +#if defined(DUK_OPT_NO_PACKED_TVAL) +#error unsupported legacy feature option DUK_OPT_NO_PACKED_TVAL used +#endif +#if defined(DUK_OPT_NO_PC2LINE) +#error unsupported legacy feature option DUK_OPT_NO_PC2LINE used +#endif +#if defined(DUK_OPT_NO_REFERENCE_COUNTING) +#error unsupported legacy feature option DUK_OPT_NO_REFERENCE_COUNTING used +#endif +#if defined(DUK_OPT_NO_REGEXP_SUPPORT) +#error unsupported legacy feature option DUK_OPT_NO_REGEXP_SUPPORT used +#endif +#if defined(DUK_OPT_NO_SECTION_B) +#error unsupported legacy feature option DUK_OPT_NO_SECTION_B used +#endif +#if defined(DUK_OPT_NO_SOURCE_NONBMP) +#error unsupported legacy feature option DUK_OPT_NO_SOURCE_NONBMP used +#endif +#if defined(DUK_OPT_NO_STRICT_DECL) +#error unsupported legacy feature option DUK_OPT_NO_STRICT_DECL used +#endif +#if defined(DUK_OPT_NO_TRACEBACKS) +#error unsupported legacy feature option DUK_OPT_NO_TRACEBACKS used +#endif +#if defined(DUK_OPT_NO_VERBOSE_ERRORS) +#error unsupported legacy feature option DUK_OPT_NO_VERBOSE_ERRORS used +#endif +#if defined(DUK_OPT_NO_VOLUNTARY_GC) +#error unsupported legacy feature option DUK_OPT_NO_VOLUNTARY_GC used +#endif +#if defined(DUK_OPT_NO_ZERO_BUFFER_DATA) +#error unsupported legacy feature option DUK_OPT_NO_ZERO_BUFFER_DATA used +#endif +#if defined(DUK_OPT_OBJSIZES16) +#error unsupported legacy feature option DUK_OPT_OBJSIZES16 used +#endif +#if defined(DUK_OPT_PANIC_HANDLER) +#error unsupported legacy feature option DUK_OPT_PANIC_HANDLER used +#endif +#if defined(DUK_OPT_REFCOUNT16) +#error unsupported legacy feature option DUK_OPT_REFCOUNT16 used +#endif +#if defined(DUK_OPT_SEGFAULT_ON_PANIC) +#error unsupported legacy feature option DUK_OPT_SEGFAULT_ON_PANIC used +#endif +#if defined(DUK_OPT_SELF_TESTS) +#error unsupported legacy feature option DUK_OPT_SELF_TESTS used +#endif +#if defined(DUK_OPT_SETJMP) +#error unsupported legacy feature option DUK_OPT_SETJMP used +#endif +#if defined(DUK_OPT_SHUFFLE_TORTURE) +#error unsupported legacy feature option DUK_OPT_SHUFFLE_TORTURE used +#endif +#if defined(DUK_OPT_SIGSETJMP) +#error unsupported legacy feature option DUK_OPT_SIGSETJMP used +#endif +#if defined(DUK_OPT_STRHASH16) +#error unsupported legacy feature option DUK_OPT_STRHASH16 used +#endif +#if defined(DUK_OPT_STRICT_UTF8_SOURCE) +#error unsupported legacy feature option DUK_OPT_STRICT_UTF8_SOURCE used +#endif +#if defined(DUK_OPT_STRLEN16) +#error unsupported legacy feature option DUK_OPT_STRLEN16 used +#endif +#if defined(DUK_OPT_STRTAB_CHAIN) +#error unsupported legacy feature option DUK_OPT_STRTAB_CHAIN used +#endif +#if defined(DUK_OPT_STRTAB_CHAIN_SIZE) +#error unsupported legacy feature option DUK_OPT_STRTAB_CHAIN_SIZE used +#endif +#if defined(DUK_OPT_TARGET_INFO) +#error unsupported legacy feature option DUK_OPT_TARGET_INFO used +#endif +#if defined(DUK_OPT_TRACEBACK_DEPTH) +#error unsupported legacy feature option DUK_OPT_TRACEBACK_DEPTH used +#endif +#if defined(DUK_OPT_UNDERSCORE_SETJMP) +#error unsupported legacy feature option DUK_OPT_UNDERSCORE_SETJMP used +#endif +#if defined(DUK_OPT_USER_INITJS) +#error unsupported legacy feature option DUK_OPT_USER_INITJS used +#endif + +/* + * Checks for config option consistency (DUK_USE_xxx) + */ + +#if defined(DUK_USE_32BIT_PTRS) +#error unsupported config option used (option has been removed): DUK_USE_32BIT_PTRS +#endif +#if defined(DUK_USE_ALIGN_4) +#error unsupported config option used (option has been removed): DUK_USE_ALIGN_4 +#endif +#if defined(DUK_USE_ALIGN_8) +#error unsupported config option used (option has been removed): DUK_USE_ALIGN_8 +#endif +#if defined(DUK_USE_BROWSER_LIKE) +#error unsupported config option used (option has been removed): DUK_USE_BROWSER_LIKE +#endif +#if defined(DUK_USE_BUILTIN_INITJS) +#error unsupported config option used (option has been removed): DUK_USE_BUILTIN_INITJS +#endif +#if defined(DUK_USE_BYTEORDER_FORCED) +#error unsupported config option used (option has been removed): DUK_USE_BYTEORDER_FORCED +#endif +#if defined(DUK_USE_DATAPTR_DEC16) && !defined(DUK_USE_DATAPTR16) +#error config option DUK_USE_DATAPTR_DEC16 requires option DUK_USE_DATAPTR16 (which is missing) +#endif +#if defined(DUK_USE_DATAPTR_ENC16) && !defined(DUK_USE_DATAPTR16) +#error config option DUK_USE_DATAPTR_ENC16 requires option DUK_USE_DATAPTR16 (which is missing) +#endif +#if defined(DUK_USE_DDDPRINT) +#error unsupported config option used (option has been removed): DUK_USE_DDDPRINT +#endif +#if defined(DUK_USE_DDPRINT) +#error unsupported config option used (option has been removed): DUK_USE_DDPRINT +#endif +#if defined(DUK_USE_DEBUGGER_FWD_LOGGING) +#error unsupported config option used (option has been removed): DUK_USE_DEBUGGER_FWD_LOGGING +#endif +#if defined(DUK_USE_DEBUGGER_FWD_PRINTALERT) +#error unsupported config option used (option has been removed): DUK_USE_DEBUGGER_FWD_PRINTALERT +#endif +#if defined(DUK_USE_DEBUGGER_SUPPORT) && !defined(DUK_USE_INTERRUPT_COUNTER) +#error config option DUK_USE_DEBUGGER_SUPPORT requires option DUK_USE_INTERRUPT_COUNTER (which is missing) +#endif +#if defined(DUK_USE_DEEP_C_STACK) +#error unsupported config option used (option has been removed): DUK_USE_DEEP_C_STACK +#endif +#if defined(DUK_USE_DOUBLE_BE) +#error unsupported config option used (option has been removed): DUK_USE_DOUBLE_BE +#endif +#if defined(DUK_USE_DOUBLE_BE) && defined(DUK_USE_DOUBLE_LE) +#error config option DUK_USE_DOUBLE_BE conflicts with option DUK_USE_DOUBLE_LE (which is also defined) +#endif +#if defined(DUK_USE_DOUBLE_BE) && defined(DUK_USE_DOUBLE_ME) +#error config option DUK_USE_DOUBLE_BE conflicts with option DUK_USE_DOUBLE_ME (which is also defined) +#endif +#if defined(DUK_USE_DOUBLE_LE) +#error unsupported config option used (option has been removed): DUK_USE_DOUBLE_LE +#endif +#if defined(DUK_USE_DOUBLE_LE) && defined(DUK_USE_DOUBLE_BE) +#error config option DUK_USE_DOUBLE_LE conflicts with option DUK_USE_DOUBLE_BE (which is also defined) +#endif +#if defined(DUK_USE_DOUBLE_LE) && defined(DUK_USE_DOUBLE_ME) +#error config option DUK_USE_DOUBLE_LE conflicts with option DUK_USE_DOUBLE_ME (which is also defined) +#endif +#if defined(DUK_USE_DOUBLE_ME) +#error unsupported config option used (option has been removed): DUK_USE_DOUBLE_ME +#endif +#if defined(DUK_USE_DOUBLE_ME) && defined(DUK_USE_DOUBLE_LE) +#error config option DUK_USE_DOUBLE_ME conflicts with option DUK_USE_DOUBLE_LE (which is also defined) +#endif +#if defined(DUK_USE_DOUBLE_ME) && defined(DUK_USE_DOUBLE_BE) +#error config option DUK_USE_DOUBLE_ME conflicts with option DUK_USE_DOUBLE_BE (which is also defined) +#endif +#if defined(DUK_USE_DPRINT) +#error unsupported config option used (option has been removed): DUK_USE_DPRINT +#endif +#if defined(DUK_USE_DPRINT) && !defined(DUK_USE_DEBUG) +#error config option DUK_USE_DPRINT requires option DUK_USE_DEBUG (which is missing) +#endif +#if defined(DUK_USE_DPRINT_COLORS) +#error unsupported config option used (option has been removed): DUK_USE_DPRINT_COLORS +#endif +#if defined(DUK_USE_DPRINT_RDTSC) +#error unsupported config option used (option has been removed): DUK_USE_DPRINT_RDTSC +#endif +#if defined(DUK_USE_ES6_REGEXP_BRACES) +#error unsupported config option used (option has been removed): DUK_USE_ES6_REGEXP_BRACES +#endif +#if defined(DUK_USE_ESBC_MAX_BYTES) && !defined(DUK_USE_ESBC_LIMITS) +#error config option DUK_USE_ESBC_MAX_BYTES requires option DUK_USE_ESBC_LIMITS (which is missing) +#endif +#if defined(DUK_USE_ESBC_MAX_LINENUMBER) && !defined(DUK_USE_ESBC_LIMITS) +#error config option DUK_USE_ESBC_MAX_LINENUMBER requires option DUK_USE_ESBC_LIMITS (which is missing) +#endif +#if defined(DUK_USE_EXEC_TIMEOUT_CHECK) && !defined(DUK_USE_INTERRUPT_COUNTER) +#error config option DUK_USE_EXEC_TIMEOUT_CHECK requires option DUK_USE_INTERRUPT_COUNTER (which is missing) +#endif +#if defined(DUK_USE_EXTSTR_FREE) && !defined(DUK_USE_HSTRING_EXTDATA) +#error config option DUK_USE_EXTSTR_FREE requires option DUK_USE_HSTRING_EXTDATA (which is missing) +#endif +#if defined(DUK_USE_EXTSTR_INTERN_CHECK) && !defined(DUK_USE_HSTRING_EXTDATA) +#error config option DUK_USE_EXTSTR_INTERN_CHECK requires option DUK_USE_HSTRING_EXTDATA (which is missing) +#endif +#if defined(DUK_USE_FASTINT) && !defined(DUK_USE_64BIT_OPS) +#error config option DUK_USE_FASTINT requires option DUK_USE_64BIT_OPS (which is missing) +#endif +#if defined(DUK_USE_FILE_IO) +#error unsupported config option used (option has been removed): DUK_USE_FILE_IO +#endif +#if defined(DUK_USE_FULL_TVAL) +#error unsupported config option used (option has been removed): DUK_USE_FULL_TVAL +#endif +#if defined(DUK_USE_FUNCPTR_DEC16) && !defined(DUK_USE_FUNCPTR16) +#error config option DUK_USE_FUNCPTR_DEC16 requires option DUK_USE_FUNCPTR16 (which is missing) +#endif +#if defined(DUK_USE_FUNCPTR_ENC16) && !defined(DUK_USE_FUNCPTR16) +#error config option DUK_USE_FUNCPTR_ENC16 requires option DUK_USE_FUNCPTR16 (which is missing) +#endif +#if defined(DUK_USE_HASHBYTES_UNALIGNED_U32_ACCESS) +#error unsupported config option used (option has been removed): DUK_USE_HASHBYTES_UNALIGNED_U32_ACCESS +#endif +#if defined(DUK_USE_HEAPPTR16) && defined(DUK_USE_DEBUG) +#error config option DUK_USE_HEAPPTR16 conflicts with option DUK_USE_DEBUG (which is also defined) +#endif +#if defined(DUK_USE_HEAPPTR_DEC16) && !defined(DUK_USE_HEAPPTR16) +#error config option DUK_USE_HEAPPTR_DEC16 requires option DUK_USE_HEAPPTR16 (which is missing) +#endif +#if defined(DUK_USE_HEAPPTR_ENC16) && !defined(DUK_USE_HEAPPTR16) +#error config option DUK_USE_HEAPPTR_ENC16 requires option DUK_USE_HEAPPTR16 (which is missing) +#endif +#if defined(DUK_USE_INTEGER_BE) +#error unsupported config option used (option has been removed): DUK_USE_INTEGER_BE +#endif +#if defined(DUK_USE_INTEGER_BE) && defined(DUK_USE_INTEGER_LE) +#error config option DUK_USE_INTEGER_BE conflicts with option DUK_USE_INTEGER_LE (which is also defined) +#endif +#if defined(DUK_USE_INTEGER_BE) && defined(DUK_USE_INTEGER_ME) +#error config option DUK_USE_INTEGER_BE conflicts with option DUK_USE_INTEGER_ME (which is also defined) +#endif +#if defined(DUK_USE_INTEGER_LE) +#error unsupported config option used (option has been removed): DUK_USE_INTEGER_LE +#endif +#if defined(DUK_USE_INTEGER_LE) && defined(DUK_USE_INTEGER_BE) +#error config option DUK_USE_INTEGER_LE conflicts with option DUK_USE_INTEGER_BE (which is also defined) +#endif +#if defined(DUK_USE_INTEGER_LE) && defined(DUK_USE_INTEGER_ME) +#error config option DUK_USE_INTEGER_LE conflicts with option DUK_USE_INTEGER_ME (which is also defined) +#endif +#if defined(DUK_USE_INTEGER_ME) +#error unsupported config option used (option has been removed): DUK_USE_INTEGER_ME +#endif +#if defined(DUK_USE_INTEGER_ME) && defined(DUK_USE_INTEGER_LE) +#error config option DUK_USE_INTEGER_ME conflicts with option DUK_USE_INTEGER_LE (which is also defined) +#endif +#if defined(DUK_USE_INTEGER_ME) && defined(DUK_USE_INTEGER_BE) +#error config option DUK_USE_INTEGER_ME conflicts with option DUK_USE_INTEGER_BE (which is also defined) +#endif +#if defined(DUK_USE_MARKANDSWEEP_FINALIZER_TORTURE) +#error unsupported config option used (option has been removed): DUK_USE_MARKANDSWEEP_FINALIZER_TORTURE +#endif +#if defined(DUK_USE_MARK_AND_SWEEP) +#error unsupported config option used (option has been removed): DUK_USE_MARK_AND_SWEEP +#endif +#if defined(DUK_USE_MATH_FMAX) +#error unsupported config option used (option has been removed): DUK_USE_MATH_FMAX +#endif +#if defined(DUK_USE_MATH_FMIN) +#error unsupported config option used (option has been removed): DUK_USE_MATH_FMIN +#endif +#if defined(DUK_USE_MATH_ROUND) +#error unsupported config option used (option has been removed): DUK_USE_MATH_ROUND +#endif +#if defined(DUK_USE_MS_STRINGTABLE_RESIZE) +#error unsupported config option used (option has been removed): DUK_USE_MS_STRINGTABLE_RESIZE +#endif +#if defined(DUK_USE_NONSTD_ARRAY_CONCAT_TRAILER) +#error unsupported config option used (option has been removed): DUK_USE_NONSTD_ARRAY_CONCAT_TRAILER +#endif +#if defined(DUK_USE_NONSTD_ARRAY_MAP_TRAILER) +#error unsupported config option used (option has been removed): DUK_USE_NONSTD_ARRAY_MAP_TRAILER +#endif +#if defined(DUK_USE_NONSTD_REGEXP_DOLLAR_ESCAPE) +#error unsupported config option used (option has been removed): DUK_USE_NONSTD_REGEXP_DOLLAR_ESCAPE +#endif +#if defined(DUK_USE_NO_DOUBLE_ALIASING_SELFTEST) +#error unsupported config option used (option has been removed): DUK_USE_NO_DOUBLE_ALIASING_SELFTEST +#endif +#if defined(DUK_USE_OCTAL_SUPPORT) +#error unsupported config option used (option has been removed): DUK_USE_OCTAL_SUPPORT +#endif +#if defined(DUK_USE_PACKED_TVAL_POSSIBLE) +#error unsupported config option used (option has been removed): DUK_USE_PACKED_TVAL_POSSIBLE +#endif +#if defined(DUK_USE_PANIC_ABORT) +#error unsupported config option used (option has been removed): DUK_USE_PANIC_ABORT +#endif +#if defined(DUK_USE_PANIC_EXIT) +#error unsupported config option used (option has been removed): DUK_USE_PANIC_EXIT +#endif +#if defined(DUK_USE_PANIC_HANDLER) +#error unsupported config option used (option has been removed): DUK_USE_PANIC_HANDLER +#endif +#if defined(DUK_USE_PANIC_SEGFAULT) +#error unsupported config option used (option has been removed): DUK_USE_PANIC_SEGFAULT +#endif +#if defined(DUK_USE_POW_NETBSD_WORKAROUND) +#error unsupported config option used (option has been removed): DUK_USE_POW_NETBSD_WORKAROUND +#endif +#if defined(DUK_USE_RDTSC) +#error unsupported config option used (option has been removed): DUK_USE_RDTSC +#endif +#if defined(DUK_USE_REFZERO_FINALIZER_TORTURE) +#error unsupported config option used (option has been removed): DUK_USE_REFZERO_FINALIZER_TORTURE +#endif +#if defined(DUK_USE_ROM_GLOBAL_CLONE) && !defined(DUK_USE_ROM_STRINGS) +#error config option DUK_USE_ROM_GLOBAL_CLONE requires option DUK_USE_ROM_STRINGS (which is missing) +#endif +#if defined(DUK_USE_ROM_GLOBAL_CLONE) && !defined(DUK_USE_ROM_OBJECTS) +#error config option DUK_USE_ROM_GLOBAL_CLONE requires option DUK_USE_ROM_OBJECTS (which is missing) +#endif +#if defined(DUK_USE_ROM_GLOBAL_CLONE) && defined(DUK_USE_ROM_GLOBAL_INHERIT) +#error config option DUK_USE_ROM_GLOBAL_CLONE conflicts with option DUK_USE_ROM_GLOBAL_INHERIT (which is also defined) +#endif +#if defined(DUK_USE_ROM_GLOBAL_INHERIT) && !defined(DUK_USE_ROM_STRINGS) +#error config option DUK_USE_ROM_GLOBAL_INHERIT requires option DUK_USE_ROM_STRINGS (which is missing) +#endif +#if defined(DUK_USE_ROM_GLOBAL_INHERIT) && !defined(DUK_USE_ROM_OBJECTS) +#error config option DUK_USE_ROM_GLOBAL_INHERIT requires option DUK_USE_ROM_OBJECTS (which is missing) +#endif +#if defined(DUK_USE_ROM_GLOBAL_INHERIT) && defined(DUK_USE_ROM_GLOBAL_CLONE) +#error config option DUK_USE_ROM_GLOBAL_INHERIT conflicts with option DUK_USE_ROM_GLOBAL_CLONE (which is also defined) +#endif +#if defined(DUK_USE_ROM_OBJECTS) && !defined(DUK_USE_ROM_STRINGS) +#error config option DUK_USE_ROM_OBJECTS requires option DUK_USE_ROM_STRINGS (which is missing) +#endif +#if defined(DUK_USE_ROM_STRINGS) && !defined(DUK_USE_ROM_OBJECTS) +#error config option DUK_USE_ROM_STRINGS requires option DUK_USE_ROM_OBJECTS (which is missing) +#endif +#if defined(DUK_USE_SETJMP) +#error unsupported config option used (option has been removed): DUK_USE_SETJMP +#endif +#if defined(DUK_USE_SIGSETJMP) +#error unsupported config option used (option has been removed): DUK_USE_SIGSETJMP +#endif +#if defined(DUK_USE_STRTAB_CHAIN) +#error unsupported config option used (option has been removed): DUK_USE_STRTAB_CHAIN +#endif +#if defined(DUK_USE_STRTAB_CHAIN_SIZE) +#error unsupported config option used (option has been removed): DUK_USE_STRTAB_CHAIN_SIZE +#endif +#if defined(DUK_USE_STRTAB_CHAIN_SIZE) && !defined(DUK_USE_STRTAB_CHAIN) +#error config option DUK_USE_STRTAB_CHAIN_SIZE requires option DUK_USE_STRTAB_CHAIN (which is missing) +#endif +#if defined(DUK_USE_STRTAB_PROBE) +#error unsupported config option used (option has been removed): DUK_USE_STRTAB_PROBE +#endif +#if defined(DUK_USE_STRTAB_PTRCOMP) && !defined(DUK_USE_HEAPPTR16) +#error config option DUK_USE_STRTAB_PTRCOMP requires option DUK_USE_HEAPPTR16 (which is missing) +#endif +#if defined(DUK_USE_TAILCALL) && defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) +#error config option DUK_USE_TAILCALL conflicts with option DUK_USE_NONSTD_FUNC_CALLER_PROPERTY (which is also defined) +#endif +#if defined(DUK_USE_UNALIGNED_ACCESSES_POSSIBLE) +#error unsupported config option used (option has been removed): DUK_USE_UNALIGNED_ACCESSES_POSSIBLE +#endif +#if defined(DUK_USE_UNDERSCORE_SETJMP) +#error unsupported config option used (option has been removed): DUK_USE_UNDERSCORE_SETJMP +#endif +#if defined(DUK_USE_USER_INITJS) +#error unsupported config option used (option has been removed): DUK_USE_USER_INITJS +#endif + +#if defined(DUK_USE_CPP_EXCEPTIONS) && !defined(__cplusplus) +#error DUK_USE_CPP_EXCEPTIONS enabled but not compiling with a C++ compiler +#endif + +/* + * Convert DUK_USE_BYTEORDER, from whatever source, into currently used + * internal defines. If detection failed, #error out. + */ + +#if defined(DUK_USE_BYTEORDER) +#if (DUK_USE_BYTEORDER == 1) +#define DUK_USE_INTEGER_LE +#define DUK_USE_DOUBLE_LE +#elif (DUK_USE_BYTEORDER == 2) +#define DUK_USE_INTEGER_LE /* integer endianness is little on purpose */ +#define DUK_USE_DOUBLE_ME +#elif (DUK_USE_BYTEORDER == 3) +#define DUK_USE_INTEGER_BE +#define DUK_USE_DOUBLE_BE +#else +#error unsupported: byte order invalid +#endif /* byte order */ +#else +#error unsupported: byte order detection failed +#endif /* defined(DUK_USE_BYTEORDER) */ + +#endif /* DUK_CONFIG_H_INCLUDED */ diff --git a/src/duktape.c b/src/duktape.c new file mode 100644 index 00000000..c3781f76 --- /dev/null +++ b/src/duktape.c @@ -0,0 +1,96801 @@ +/* + * Single source autogenerated distributable for Duktape 2.3.0. + * + * Git commit d7fdb67f18561a50e06bafd196c6b423af9ad6fe (v2.3.0). + * Git branch master. + * + * See Duktape AUTHORS.rst and LICENSE.txt for copyright and + * licensing information. + */ + +/* LICENSE.txt */ +/* +* =============== +* Duktape license +* =============== +* +* (http://opensource.org/licenses/MIT) +* +* Copyright (c) 2013-2018 by Duktape authors (see AUTHORS.rst) +* +* Permission is hereby granted, free of charge, to any person obtaining a copy +* of this software and associated documentation files (the "Software"), to deal +* in the Software without restriction, including without limitation the rights +* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +* copies of the Software, and to permit persons to whom the Software is +* furnished to do so, subject to the following conditions: +* +* The above copyright notice and this permission notice shall be included in +* all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +* THE SOFTWARE. +*/ + +/* AUTHORS.rst */ +/* +* =============== +* Duktape authors +* =============== +* +* Copyright +* ========= +* +* Duktape copyrights are held by its authors. Each author has a copyright +* to their contribution, and agrees to irrevocably license the contribution +* under the Duktape ``LICENSE.txt``. +* +* Authors +* ======= +* +* Please include an e-mail address, a link to your GitHub profile, or something +* similar to allow your contribution to be identified accurately. +* +* The following people have contributed code, website contents, or Wiki contents, +* and agreed to irrevocably license their contributions under the Duktape +* ``LICENSE.txt`` (in order of appearance): +* +* * Sami Vaarala <sami.vaarala@iki.fi> +* * Niki Dobrev +* * Andreas \u00d6man <andreas@lonelycoder.com> +* * L\u00e1szl\u00f3 Lang\u00f3 <llango.u-szeged@partner.samsung.com> +* * Legimet <legimet.calc@gmail.com> +* * Karl Skomski <karl@skomski.com> +* * Bruce Pascoe <fatcerberus1@gmail.com> +* * Ren\u00e9 Hollander <rene@rene8888.at> +* * Julien Hamaide (https://github.com/crazyjul) +* * Sebastian G\u00f6tte (https://github.com/jaseg) +* * Tomasz Magulski (https://github.com/magul) +* * \D. Bohdan (https://github.com/dbohdan) +* * Ond\u0159ej Jirman (https://github.com/megous) +* * Sa\u00fal Ibarra Corretg\u00e9 <saghul@gmail.com> +* * Jeremy HU <huxingyi@msn.com> +* * Ole Andr\u00e9 Vadla Ravn\u00e5s (https://github.com/oleavr) +* * Harold Brenes (https://github.com/harold-b) +* * Oliver Crow (https://github.com/ocrow) +* * Jakub Ch\u0142api\u0144ski (https://github.com/jchlapinski) +* * Brett Vickers (https://github.com/beevik) +* * Dominik Okwieka (https://github.com/okitec) +* * Remko Tron\u00e7on (https://el-tramo.be) +* * Romero Malaquias (rbsm@ic.ufal.br) +* * Michael Drake <michael.drake@codethink.co.uk> +* * Steven Don (https://github.com/shdon) +* * Simon Stone (https://github.com/sstone1) +* * \J. McC. (https://github.com/jmhmccr) +* * Jakub Nowakowski (https://github.com/jimvonmoon) +* * Tommy Nguyen (https://github.com/tn0502) +* * Fabrice Fontaine (https://github.com/ffontaine) +* * Christopher Hiller (https://github.com/boneskull) +* * Gonzalo Diethelm (https://github.com/gonzus) +* * Michal Kasperek (https://github.com/michalkas) +* * Andrew Janke (https://github.com/apjanke) +* * Steve Fan (https://github.com/stevefan1999) +* +* Other contributions +* =================== +* +* The following people have contributed something other than code (e.g. reported +* bugs, provided ideas, etc; roughly in order of appearance): +* +* * Greg Burns +* * Anthony Rabine +* * Carlos Costa +* * Aur\u00e9lien Bouilland +* * Preet Desai (Pris Matic) +* * judofyr (http://www.reddit.com/user/judofyr) +* * Jason Woofenden +* * Micha\u0142 Przyby\u015b +* * Anthony Howe +* * Conrad Pankoff +* * Jim Schimpf +* * Rajaran Gaunker (https://github.com/zimbabao) +* * Andreas \u00d6man +* * Doug Sanden +* * Josh Engebretson (https://github.com/JoshEngebretson) +* * Remo Eichenberger (https://github.com/remoe) +* * Mamod Mehyar (https://github.com/mamod) +* * David Demelier (https://github.com/markand) +* * Tim Caswell (https://github.com/creationix) +* * Mitchell Blank Jr (https://github.com/mitchblank) +* * https://github.com/yushli +* * Seo Sanghyeon (https://github.com/sanxiyn) +* * Han ChoongWoo (https://github.com/tunz) +* * Joshua Peek (https://github.com/josh) +* * Bruce E. Pascoe (https://github.com/fatcerberus) +* * https://github.com/Kelledin +* * https://github.com/sstruchtrup +* * Michael Drake (https://github.com/tlsa) +* * https://github.com/chris-y +* * Laurent Zubiaur (https://github.com/lzubiaur) +* * Neil Kolban (https://github.com/nkolban) +* * Wilhelm Wanecek (https://github.com/wanecek) +* * Andrew Janke (https://github.com/apjanke) +* +* If you are accidentally missing from this list, send me an e-mail +* (``sami.vaarala@iki.fi``) and I'll fix the omission. +*/ + +#line 1 "duk_replacements.c" +/* + * Replacements for missing platform functions. + * + * Unlike the originals, fpclassify() and signbit() replacements don't + * work on any floating point types, only doubles. The C typing here + * mimics the standard prototypes. + */ + +/* #include duk_internal.h */ +#line 1 "duk_internal.h" +/* + * Top-level include file to be used for all (internal) source files. + * + * Source files should not include individual header files, as they + * have not been designed to be individually included. + */ + +#if !defined(DUK_INTERNAL_H_INCLUDED) +#define DUK_INTERNAL_H_INCLUDED + +/* + * The 'duktape.h' header provides the public API, but also handles all + * compiler and platform specific feature detection, Duktape feature + * resolution, inclusion of system headers, etc. These have been merged + * because the public API is also dependent on e.g. detecting appropriate + * C types which is quite platform/compiler specific especially for a non-C99 + * build. The public API is also dependent on the resolved feature set. + * + * Some actions taken by the merged header (such as including system headers) + * are not appropriate for building a user application. The define + * DUK_COMPILING_DUKTAPE allows the merged header to skip/include some + * sections depending on what is being built. + */ + +#define DUK_COMPILING_DUKTAPE +#include "duktape.h" + +/* + * User declarations, e.g. prototypes for user functions used by Duktape + * macros. + */ + +DUK_USE_USER_DECLARE() + +/* + * Duktape includes (other than duk_features.h) + * + * The header files expect to be included in an order which satisfies header + * dependencies correctly (the headers themselves don't include any other + * includes). Forward declarations are used to break circular struct/typedef + * dependencies. + */ + +/* #include duk_dblunion.h */ +#line 1 "duk_dblunion.h" +/* + * Union to access IEEE double memory representation, indexes for double + * memory representation, and some macros for double manipulation. + * + * Also used by packed duk_tval. Use a union for bit manipulation to + * minimize aliasing issues in practice. The C99 standard does not + * guarantee that this should work, but it's a very widely supported + * practice for low level manipulation. + * + * IEEE double format summary: + * + * seeeeeee eeeeffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff + * A B C D E F G H + * + * s sign bit + * eee... exponent field + * fff... fraction + * + * See http://en.wikipedia.org/wiki/Double_precision_floating-point_format. + * + * NaNs are represented as exponent 0x7ff and mantissa != 0. The NaN is a + * signaling NaN when the highest bit of the mantissa is zero, and a quiet + * NaN when the highest bit is set. + * + * At least three memory layouts are relevant here: + * + * A B C D E F G H Big endian (e.g. 68k) DUK_USE_DOUBLE_BE + * H G F E D C B A Little endian (e.g. x86) DUK_USE_DOUBLE_LE + * D C B A H G F E Mixed/cross endian (e.g. ARM) DUK_USE_DOUBLE_ME + * + * ARM is a special case: ARM double values are in mixed/cross endian + * format while ARM duk_uint64_t values are in standard little endian + * format (H G F E D C B A). When a double is read as a duk_uint64_t + * from memory, the register will contain the (logical) value + * E F G H A B C D. This requires some special handling below. + * + * Indexes of various types (8-bit, 16-bit, 32-bit) in memory relative to + * the logical (big endian) order: + * + * byte order duk_uint8_t duk_uint16_t duk_uint32_t + * BE 01234567 0123 01 + * LE 76543210 3210 10 + * ME (ARM) 32107654 1032 01 + * + * Some processors may alter NaN values in a floating point load+store. + * For instance, on X86 a FLD + FSTP may convert a signaling NaN to a + * quiet one. This is catastrophic when NaN space is used in packed + * duk_tval values. See: misc/clang_aliasing.c. + */ + +#if !defined(DUK_DBLUNION_H_INCLUDED) +#define DUK_DBLUNION_H_INCLUDED + +/* + * Union for accessing double parts, also serves as packed duk_tval + */ + +union duk_double_union { + double d; + float f[2]; +#if defined(DUK_USE_64BIT_OPS) + duk_uint64_t ull[1]; +#endif + duk_uint32_t ui[2]; + duk_uint16_t us[4]; + duk_uint8_t uc[8]; +#if defined(DUK_USE_PACKED_TVAL) + void *vp[2]; /* used by packed duk_tval, assumes sizeof(void *) == 4 */ +#endif +}; + +typedef union duk_double_union duk_double_union; + +/* + * Indexes of various types with respect to big endian (logical) layout + */ + +#if defined(DUK_USE_DOUBLE_LE) +#if defined(DUK_USE_64BIT_OPS) +#define DUK_DBL_IDX_ULL0 0 +#endif +#define DUK_DBL_IDX_UI0 1 +#define DUK_DBL_IDX_UI1 0 +#define DUK_DBL_IDX_US0 3 +#define DUK_DBL_IDX_US1 2 +#define DUK_DBL_IDX_US2 1 +#define DUK_DBL_IDX_US3 0 +#define DUK_DBL_IDX_UC0 7 +#define DUK_DBL_IDX_UC1 6 +#define DUK_DBL_IDX_UC2 5 +#define DUK_DBL_IDX_UC3 4 +#define DUK_DBL_IDX_UC4 3 +#define DUK_DBL_IDX_UC5 2 +#define DUK_DBL_IDX_UC6 1 +#define DUK_DBL_IDX_UC7 0 +#define DUK_DBL_IDX_VP0 DUK_DBL_IDX_UI0 /* packed tval */ +#define DUK_DBL_IDX_VP1 DUK_DBL_IDX_UI1 /* packed tval */ +#elif defined(DUK_USE_DOUBLE_BE) +#if defined(DUK_USE_64BIT_OPS) +#define DUK_DBL_IDX_ULL0 0 +#endif +#define DUK_DBL_IDX_UI0 0 +#define DUK_DBL_IDX_UI1 1 +#define DUK_DBL_IDX_US0 0 +#define DUK_DBL_IDX_US1 1 +#define DUK_DBL_IDX_US2 2 +#define DUK_DBL_IDX_US3 3 +#define DUK_DBL_IDX_UC0 0 +#define DUK_DBL_IDX_UC1 1 +#define DUK_DBL_IDX_UC2 2 +#define DUK_DBL_IDX_UC3 3 +#define DUK_DBL_IDX_UC4 4 +#define DUK_DBL_IDX_UC5 5 +#define DUK_DBL_IDX_UC6 6 +#define DUK_DBL_IDX_UC7 7 +#define DUK_DBL_IDX_VP0 DUK_DBL_IDX_UI0 /* packed tval */ +#define DUK_DBL_IDX_VP1 DUK_DBL_IDX_UI1 /* packed tval */ +#elif defined(DUK_USE_DOUBLE_ME) +#if defined(DUK_USE_64BIT_OPS) +#define DUK_DBL_IDX_ULL0 0 /* not directly applicable, byte order differs from a double */ +#endif +#define DUK_DBL_IDX_UI0 0 +#define DUK_DBL_IDX_UI1 1 +#define DUK_DBL_IDX_US0 1 +#define DUK_DBL_IDX_US1 0 +#define DUK_DBL_IDX_US2 3 +#define DUK_DBL_IDX_US3 2 +#define DUK_DBL_IDX_UC0 3 +#define DUK_DBL_IDX_UC1 2 +#define DUK_DBL_IDX_UC2 1 +#define DUK_DBL_IDX_UC3 0 +#define DUK_DBL_IDX_UC4 7 +#define DUK_DBL_IDX_UC5 6 +#define DUK_DBL_IDX_UC6 5 +#define DUK_DBL_IDX_UC7 4 +#define DUK_DBL_IDX_VP0 DUK_DBL_IDX_UI0 /* packed tval */ +#define DUK_DBL_IDX_VP1 DUK_DBL_IDX_UI1 /* packed tval */ +#else +#error internal error +#endif + +/* + * Helper macros for reading/writing memory representation parts, used + * by duk_numconv.c and duk_tval.h. + */ + +#define DUK_DBLUNION_SET_DOUBLE(u,v) do { \ + (u)->d = (v); \ + } while (0) + +#define DUK_DBLUNION_SET_HIGH32(u,v) do { \ + (u)->ui[DUK_DBL_IDX_UI0] = (duk_uint32_t) (v); \ + } while (0) + +#if defined(DUK_USE_64BIT_OPS) +#if defined(DUK_USE_DOUBLE_ME) +#define DUK_DBLUNION_SET_HIGH32_ZERO_LOW32(u,v) do { \ + (u)->ull[DUK_DBL_IDX_ULL0] = (duk_uint64_t) (v); \ + } while (0) +#else +#define DUK_DBLUNION_SET_HIGH32_ZERO_LOW32(u,v) do { \ + (u)->ull[DUK_DBL_IDX_ULL0] = ((duk_uint64_t) (v)) << 32; \ + } while (0) +#endif +#else /* DUK_USE_64BIT_OPS */ +#define DUK_DBLUNION_SET_HIGH32_ZERO_LOW32(u,v) do { \ + (u)->ui[DUK_DBL_IDX_UI0] = (duk_uint32_t) (v); \ + (u)->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) 0; \ + } while (0) +#endif /* DUK_USE_64BIT_OPS */ + +#define DUK_DBLUNION_SET_LOW32(u,v) do { \ + (u)->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) (v); \ + } while (0) + +#define DUK_DBLUNION_GET_DOUBLE(u) ((u)->d) +#define DUK_DBLUNION_GET_HIGH32(u) ((u)->ui[DUK_DBL_IDX_UI0]) +#define DUK_DBLUNION_GET_LOW32(u) ((u)->ui[DUK_DBL_IDX_UI1]) + +#if defined(DUK_USE_64BIT_OPS) +#if defined(DUK_USE_DOUBLE_ME) +#define DUK_DBLUNION_SET_UINT64(u,v) do { \ + (u)->ui[DUK_DBL_IDX_UI0] = (duk_uint32_t) ((v) >> 32); \ + (u)->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) (v); \ + } while (0) +#define DUK_DBLUNION_GET_UINT64(u) \ + ((((duk_uint64_t) (u)->ui[DUK_DBL_IDX_UI0]) << 32) | \ + ((duk_uint64_t) (u)->ui[DUK_DBL_IDX_UI1])) +#else +#define DUK_DBLUNION_SET_UINT64(u,v) do { \ + (u)->ull[DUK_DBL_IDX_ULL0] = (duk_uint64_t) (v); \ + } while (0) +#define DUK_DBLUNION_GET_UINT64(u) ((u)->ull[DUK_DBL_IDX_ULL0]) +#endif +#define DUK_DBLUNION_SET_INT64(u,v) DUK_DBLUNION_SET_UINT64((u), (duk_uint64_t) (v)) +#define DUK_DBLUNION_GET_INT64(u) ((duk_int64_t) DUK_DBLUNION_GET_UINT64((u))) +#endif /* DUK_USE_64BIT_OPS */ + +/* + * Double NaN manipulation macros related to NaN normalization needed when + * using the packed duk_tval representation. NaN normalization is necessary + * to keep double values compatible with the duk_tval format. + * + * When packed duk_tval is used, the NaN space is used to store pointers + * and other tagged values in addition to NaNs. Actual NaNs are normalized + * to a specific quiet NaN. The macros below are used by the implementation + * to check and normalize NaN values when they might be created. The macros + * are essentially NOPs when the non-packed duk_tval representation is used. + * + * A FULL check is exact and checks all bits. A NOTFULL check is used by + * the packed duk_tval and works correctly for all NaNs except those that + * begin with 0x7ff0. Since the 'normalized NaN' values used with packed + * duk_tval begin with 0x7ff8, the partial check is reliable when packed + * duk_tval is used. The 0x7ff8 prefix means the normalized NaN will be a + * quiet NaN regardless of its remaining lower bits. + * + * The ME variant below is specifically for ARM byte order, which has the + * feature that while doubles have a mixed byte order (32107654), unsigned + * long long values has a little endian byte order (76543210). When writing + * a logical double value through a ULL pointer, the 32-bit words need to be + * swapped; hence the #if defined()s below for ULL writes with DUK_USE_DOUBLE_ME. + * This is not full ARM support but suffices for some environments. + */ + +#if defined(DUK_USE_64BIT_OPS) +#if defined(DUK_USE_DOUBLE_ME) +/* Macros for 64-bit ops + mixed endian doubles. */ +#define DUK__DBLUNION_SET_NAN_FULL(u) do { \ + (u)->ull[DUK_DBL_IDX_ULL0] = DUK_U64_CONSTANT(0x000000007ff80000); \ + } while (0) +#define DUK__DBLUNION_IS_NAN_FULL(u) \ + ((((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x000000007ff00000)) == DUK_U64_CONSTANT(0x000000007ff00000)) && \ + ((((u)->ull[DUK_DBL_IDX_ULL0]) & DUK_U64_CONSTANT(0xffffffff000fffff)) != 0)) +#define DUK__DBLUNION_IS_NORMALIZED_NAN_FULL(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x000000007ff80000)) +#define DUK__DBLUNION_IS_ANYINF(u) \ + (((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0xffffffff7fffffff)) == DUK_U64_CONSTANT(0x000000007ff00000)) +#define DUK__DBLUNION_IS_POSINF(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x000000007ff00000)) +#define DUK__DBLUNION_IS_NEGINF(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x00000000fff00000)) +#define DUK__DBLUNION_IS_ANYZERO(u) \ + (((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0xffffffff7fffffff)) == DUK_U64_CONSTANT(0x0000000000000000)) +#define DUK__DBLUNION_IS_POSZERO(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x0000000000000000)) +#define DUK__DBLUNION_IS_NEGZERO(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x0000000080000000)) +#else +/* Macros for 64-bit ops + big/little endian doubles. */ +#define DUK__DBLUNION_SET_NAN_FULL(u) do { \ + (u)->ull[DUK_DBL_IDX_ULL0] = DUK_U64_CONSTANT(0x7ff8000000000000); \ + } while (0) +#define DUK__DBLUNION_IS_NAN_FULL(u) \ + ((((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x7ff0000000000000)) == DUK_U64_CONSTANT(0x7ff0000000000000)) && \ + ((((u)->ull[DUK_DBL_IDX_ULL0]) & DUK_U64_CONSTANT(0x000fffffffffffff)) != 0)) +#define DUK__DBLUNION_IS_NORMALIZED_NAN_FULL(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x7ff8000000000000)) +#define DUK__DBLUNION_IS_ANYINF(u) \ + (((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x7fffffffffffffff)) == DUK_U64_CONSTANT(0x7ff0000000000000)) +#define DUK__DBLUNION_IS_POSINF(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x7ff0000000000000)) +#define DUK__DBLUNION_IS_NEGINF(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0xfff0000000000000)) +#define DUK__DBLUNION_IS_ANYZERO(u) \ + (((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x7fffffffffffffff)) == DUK_U64_CONSTANT(0x0000000000000000)) +#define DUK__DBLUNION_IS_POSZERO(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x0000000000000000)) +#define DUK__DBLUNION_IS_NEGZERO(u) \ + ((u)->ull[DUK_DBL_IDX_ULL0] == DUK_U64_CONSTANT(0x8000000000000000)) +#endif +#else /* DUK_USE_64BIT_OPS */ +/* Macros for no 64-bit ops, any endianness. */ +#define DUK__DBLUNION_SET_NAN_FULL(u) do { \ + (u)->ui[DUK_DBL_IDX_UI0] = (duk_uint32_t) 0x7ff80000UL; \ + (u)->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) 0x00000000UL; \ + } while (0) +#define DUK__DBLUNION_IS_NAN_FULL(u) \ + ((((u)->ui[DUK_DBL_IDX_UI0] & 0x7ff00000UL) == 0x7ff00000UL) && \ + (((u)->ui[DUK_DBL_IDX_UI0] & 0x000fffffUL) != 0 || \ + (u)->ui[DUK_DBL_IDX_UI1] != 0)) +#define DUK__DBLUNION_IS_NORMALIZED_NAN_FULL(u) \ + (((u)->ui[DUK_DBL_IDX_UI0] == 0x7ff80000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#define DUK__DBLUNION_IS_ANYINF(u) \ + ((((u)->ui[DUK_DBL_IDX_UI0] & 0x7fffffffUL) == 0x7ff00000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#define DUK__DBLUNION_IS_POSINF(u) \ + (((u)->ui[DUK_DBL_IDX_UI0] == 0x7ff00000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#define DUK__DBLUNION_IS_NEGINF(u) \ + (((u)->ui[DUK_DBL_IDX_UI0] == 0xfff00000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#define DUK__DBLUNION_IS_ANYZERO(u) \ + ((((u)->ui[DUK_DBL_IDX_UI0] & 0x7fffffffUL) == 0x00000000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#define DUK__DBLUNION_IS_POSZERO(u) \ + (((u)->ui[DUK_DBL_IDX_UI0] == 0x00000000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#define DUK__DBLUNION_IS_NEGZERO(u) \ + (((u)->ui[DUK_DBL_IDX_UI0] == 0x80000000UL) && \ + ((u)->ui[DUK_DBL_IDX_UI1] == 0x00000000UL)) +#endif /* DUK_USE_64BIT_OPS */ + +#define DUK__DBLUNION_SET_NAN_NOTFULL(u) do { \ + (u)->us[DUK_DBL_IDX_US0] = 0x7ff8UL; \ + } while (0) + +#define DUK__DBLUNION_IS_NAN_NOTFULL(u) \ + /* E == 0x7ff, topmost four bits of F != 0 => assume NaN */ \ + ((((u)->us[DUK_DBL_IDX_US0] & 0x7ff0UL) == 0x7ff0UL) && \ + (((u)->us[DUK_DBL_IDX_US0] & 0x000fUL) != 0x0000UL)) + +#define DUK__DBLUNION_IS_NORMALIZED_NAN_NOTFULL(u) \ + /* E == 0x7ff, F == 8 => normalized NaN */ \ + ((u)->us[DUK_DBL_IDX_US0] == 0x7ff8UL) + +#define DUK__DBLUNION_NORMALIZE_NAN_CHECK_FULL(u) do { \ + if (DUK__DBLUNION_IS_NAN_FULL((u))) { \ + DUK__DBLUNION_SET_NAN_FULL((u)); \ + } \ + } while (0) + +#define DUK__DBLUNION_NORMALIZE_NAN_CHECK_NOTFULL(u) do { \ + if (DUK__DBLUNION_IS_NAN_NOTFULL((u))) { \ + DUK__DBLUNION_SET_NAN_NOTFULL((u)); \ + } \ + } while (0) + +/* Concrete macros for NaN handling used by the implementation internals. + * Chosen so that they match the duk_tval representation: with a packed + * duk_tval, ensure NaNs are properly normalized; with a non-packed duk_tval + * these are essentially NOPs. + */ + +#if defined(DUK_USE_PACKED_TVAL) +#if defined(DUK_USE_FULL_TVAL) +#define DUK_DBLUNION_NORMALIZE_NAN_CHECK(u) DUK__DBLUNION_NORMALIZE_NAN_CHECK_FULL((u)) +#define DUK_DBLUNION_IS_NAN(u) DUK__DBLUNION_IS_NAN_FULL((u)) +#define DUK_DBLUNION_IS_NORMALIZED_NAN(u) DUK__DBLUNION_IS_NORMALIZED_NAN_FULL((u)) +#define DUK_DBLUNION_SET_NAN(d) DUK__DBLUNION_SET_NAN_FULL((d)) +#else +#define DUK_DBLUNION_NORMALIZE_NAN_CHECK(u) DUK__DBLUNION_NORMALIZE_NAN_CHECK_NOTFULL((u)) +#define DUK_DBLUNION_IS_NAN(u) DUK__DBLUNION_IS_NAN_NOTFULL((u)) +#define DUK_DBLUNION_IS_NORMALIZED_NAN(u) DUK__DBLUNION_IS_NORMALIZED_NAN_NOTFULL((u)) +#define DUK_DBLUNION_SET_NAN(d) DUK__DBLUNION_SET_NAN_NOTFULL((d)) +#endif +#define DUK_DBLUNION_IS_NORMALIZED(u) \ + (!DUK_DBLUNION_IS_NAN((u)) || /* either not a NaN */ \ + DUK_DBLUNION_IS_NORMALIZED_NAN((u))) /* or is a normalized NaN */ +#else /* DUK_USE_PACKED_TVAL */ +#define DUK_DBLUNION_NORMALIZE_NAN_CHECK(u) /* nop: no need to normalize */ +#define DUK_DBLUNION_IS_NAN(u) DUK__DBLUNION_IS_NAN_FULL((u)) /* (DUK_ISNAN((u)->d)) */ +#define DUK_DBLUNION_IS_NORMALIZED_NAN(u) DUK__DBLUNION_IS_NAN_FULL((u)) /* (DUK_ISNAN((u)->d)) */ +#define DUK_DBLUNION_IS_NORMALIZED(u) 1 /* all doubles are considered normalized */ +#define DUK_DBLUNION_SET_NAN(u) do { \ + /* in non-packed representation we don't care about which NaN is used */ \ + (u)->d = DUK_DOUBLE_NAN; \ + } while (0) +#endif /* DUK_USE_PACKED_TVAL */ + +#define DUK_DBLUNION_IS_ANYINF(u) DUK__DBLUNION_IS_ANYINF((u)) +#define DUK_DBLUNION_IS_POSINF(u) DUK__DBLUNION_IS_POSINF((u)) +#define DUK_DBLUNION_IS_NEGINF(u) DUK__DBLUNION_IS_NEGINF((u)) + +#define DUK_DBLUNION_IS_ANYZERO(u) DUK__DBLUNION_IS_ANYZERO((u)) +#define DUK_DBLUNION_IS_POSZERO(u) DUK__DBLUNION_IS_POSZERO((u)) +#define DUK_DBLUNION_IS_NEGZERO(u) DUK__DBLUNION_IS_NEGZERO((u)) + +/* XXX: native 64-bit byteswaps when available */ + +/* 64-bit byteswap, same operation independent of target endianness. */ +#define DUK_DBLUNION_BSWAP64(u) do { \ + duk_uint32_t duk__bswaptmp1, duk__bswaptmp2; \ + duk__bswaptmp1 = (u)->ui[0]; \ + duk__bswaptmp2 = (u)->ui[1]; \ + duk__bswaptmp1 = DUK_BSWAP32(duk__bswaptmp1); \ + duk__bswaptmp2 = DUK_BSWAP32(duk__bswaptmp2); \ + (u)->ui[0] = duk__bswaptmp2; \ + (u)->ui[1] = duk__bswaptmp1; \ + } while (0) + +/* Byteswap an IEEE double in the duk_double_union from host to network + * order. For a big endian target this is a no-op. + */ +#if defined(DUK_USE_DOUBLE_LE) +#define DUK_DBLUNION_DOUBLE_HTON(u) do { \ + duk_uint32_t duk__bswaptmp1, duk__bswaptmp2; \ + duk__bswaptmp1 = (u)->ui[0]; \ + duk__bswaptmp2 = (u)->ui[1]; \ + duk__bswaptmp1 = DUK_BSWAP32(duk__bswaptmp1); \ + duk__bswaptmp2 = DUK_BSWAP32(duk__bswaptmp2); \ + (u)->ui[0] = duk__bswaptmp2; \ + (u)->ui[1] = duk__bswaptmp1; \ + } while (0) +#elif defined(DUK_USE_DOUBLE_ME) +#define DUK_DBLUNION_DOUBLE_HTON(u) do { \ + duk_uint32_t duk__bswaptmp1, duk__bswaptmp2; \ + duk__bswaptmp1 = (u)->ui[0]; \ + duk__bswaptmp2 = (u)->ui[1]; \ + duk__bswaptmp1 = DUK_BSWAP32(duk__bswaptmp1); \ + duk__bswaptmp2 = DUK_BSWAP32(duk__bswaptmp2); \ + (u)->ui[0] = duk__bswaptmp1; \ + (u)->ui[1] = duk__bswaptmp2; \ + } while (0) +#elif defined(DUK_USE_DOUBLE_BE) +#define DUK_DBLUNION_DOUBLE_HTON(u) do { } while (0) +#else +#error internal error, double endianness insane +#endif + +/* Reverse operation is the same. */ +#define DUK_DBLUNION_DOUBLE_NTOH(u) DUK_DBLUNION_DOUBLE_HTON((u)) + +/* Some sign bit helpers. */ +#if defined(DUK_USE_64BIT_OPS) +#define DUK_DBLUNION_HAS_SIGNBIT(u) (((u)->ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x8000000000000000)) != 0) +#define DUK_DBLUNION_GET_SIGNBIT(u) (((u)->ull[DUK_DBL_IDX_ULL0] >> 63U)) +#else +#define DUK_DBLUNION_HAS_SIGNBIT(u) (((u)->ui[DUK_DBL_IDX_UI0] & 0x80000000UL) != 0) +#define DUK_DBLUNION_GET_SIGNBIT(u) (((u)->ui[DUK_DBL_IDX_UI0] >> 31U)) +#endif + +#endif /* DUK_DBLUNION_H_INCLUDED */ +/* #include duk_replacements.h */ +#line 1 "duk_replacements.h" +#if !defined(DUK_REPLACEMENTS_H_INCLUDED) +#define DUK_REPLACEMENTS_H_INCLUDED + +#if !defined(DUK_SINGLE_FILE) +#if defined(DUK_USE_COMPUTED_INFINITY) +DUK_INTERNAL_DECL double duk_computed_infinity; +#endif +#if defined(DUK_USE_COMPUTED_NAN) +DUK_INTERNAL_DECL double duk_computed_nan; +#endif +#endif /* !DUK_SINGLE_FILE */ + +#if defined(DUK_USE_REPL_FPCLASSIFY) +DUK_INTERNAL_DECL int duk_repl_fpclassify(double x); +#endif +#if defined(DUK_USE_REPL_SIGNBIT) +DUK_INTERNAL_DECL int duk_repl_signbit(double x); +#endif +#if defined(DUK_USE_REPL_ISFINITE) +DUK_INTERNAL_DECL int duk_repl_isfinite(double x); +#endif +#if defined(DUK_USE_REPL_ISNAN) +DUK_INTERNAL_DECL int duk_repl_isnan(double x); +#endif +#if defined(DUK_USE_REPL_ISINF) +DUK_INTERNAL_DECL int duk_repl_isinf(double x); +#endif + +#endif /* DUK_REPLACEMENTS_H_INCLUDED */ +/* #include duk_jmpbuf.h */ +#line 1 "duk_jmpbuf.h" +/* + * Wrapper for jmp_buf. + * + * This is used because jmp_buf is an array type for backward compatibility. + * Wrapping jmp_buf in a struct makes pointer references, sizeof, etc, + * behave more intuitively. + * + * http://en.wikipedia.org/wiki/Setjmp.h#Member_types + */ + +#if !defined(DUK_JMPBUF_H_INCLUDED) +#define DUK_JMPBUF_H_INCLUDED + +#if defined(DUK_USE_CPP_EXCEPTIONS) +struct duk_jmpbuf { + duk_small_int_t dummy; /* unused */ +}; +#else +struct duk_jmpbuf { + DUK_JMPBUF_TYPE jb; +}; +#endif + +#endif /* DUK_JMPBUF_H_INCLUDED */ +/* #include duk_exception.h */ +#line 1 "duk_exception.h" +/* + * Exceptions for Duktape internal throws when C++ exceptions are used + * for long control transfers. + */ + +#if !defined(DUK_EXCEPTION_H_INCLUDED) +#define DUK_EXCEPTION_H_INCLUDED + +#if defined(DUK_USE_CPP_EXCEPTIONS) +/* Internal exception used as a setjmp-longjmp replacement. User code should + * NEVER see or catch this exception, so it doesn't inherit from any base + * class which should minimize the chance of user code accidentally catching + * the exception. + */ +class duk_internal_exception { + /* intentionally empty */ +}; + +/* Fatal error, thrown as a specific C++ exception with C++ exceptions + * enabled. It is unsafe to continue; doing so may cause crashes or memory + * leaks. This is intended to be either uncaught, or caught by user code + * aware of the "unsafe to continue" semantics. + */ +class duk_fatal_exception : public virtual std::runtime_error { + public: + duk_fatal_exception(const char *message) : std::runtime_error(message) {} +}; +#endif + +#endif /* DUK_EXCEPTION_H_INCLUDED */ +/* #include duk_forwdecl.h */ +#line 1 "duk_forwdecl.h" +/* + * Forward declarations for all Duktape structures. + */ + +#if !defined(DUK_FORWDECL_H_INCLUDED) +#define DUK_FORWDECL_H_INCLUDED + +/* + * Forward declarations + */ + +#if defined(DUK_USE_CPP_EXCEPTIONS) +class duk_internal_exception; +#else +struct duk_jmpbuf; +#endif + +/* duk_tval intentionally skipped */ +struct duk_heaphdr; +struct duk_heaphdr_string; +struct duk_harray; +struct duk_hstring; +struct duk_hstring_external; +struct duk_hobject; +struct duk_hcompfunc; +struct duk_hnatfunc; +struct duk_hboundfunc; +struct duk_hthread; +struct duk_hbufobj; +struct duk_hdecenv; +struct duk_hobjenv; +struct duk_hproxy; +struct duk_hbuffer; +struct duk_hbuffer_fixed; +struct duk_hbuffer_dynamic; +struct duk_hbuffer_external; + +struct duk_propaccessor; +union duk_propvalue; +struct duk_propdesc; + +struct duk_heap; +struct duk_breakpoint; + +struct duk_activation; +struct duk_catcher; +struct duk_ljstate; +struct duk_strcache_entry; +struct duk_litcache_entry; +struct duk_strtab_entry; + +#if defined(DUK_USE_DEBUG) +struct duk_fixedbuffer; +#endif + +struct duk_bitdecoder_ctx; +struct duk_bitencoder_ctx; +struct duk_bufwriter_ctx; + +struct duk_token; +struct duk_re_token; +struct duk_lexer_point; +struct duk_lexer_ctx; +struct duk_lexer_codepoint; + +struct duk_compiler_instr; +struct duk_compiler_func; +struct duk_compiler_ctx; + +struct duk_re_matcher_ctx; +struct duk_re_compiler_ctx; + +#if defined(DUK_USE_CPP_EXCEPTIONS) +/* no typedef */ +#else +typedef struct duk_jmpbuf duk_jmpbuf; +#endif + +/* duk_tval intentionally skipped */ +typedef struct duk_heaphdr duk_heaphdr; +typedef struct duk_heaphdr_string duk_heaphdr_string; +typedef struct duk_harray duk_harray; +typedef struct duk_hstring duk_hstring; +typedef struct duk_hstring_external duk_hstring_external; +typedef struct duk_hobject duk_hobject; +typedef struct duk_hcompfunc duk_hcompfunc; +typedef struct duk_hnatfunc duk_hnatfunc; +typedef struct duk_hboundfunc duk_hboundfunc; +typedef struct duk_hthread duk_hthread; +typedef struct duk_hbufobj duk_hbufobj; +typedef struct duk_hdecenv duk_hdecenv; +typedef struct duk_hobjenv duk_hobjenv; +typedef struct duk_hproxy duk_hproxy; +typedef struct duk_hbuffer duk_hbuffer; +typedef struct duk_hbuffer_fixed duk_hbuffer_fixed; +typedef struct duk_hbuffer_dynamic duk_hbuffer_dynamic; +typedef struct duk_hbuffer_external duk_hbuffer_external; + +typedef struct duk_propaccessor duk_propaccessor; +typedef union duk_propvalue duk_propvalue; +typedef struct duk_propdesc duk_propdesc; + +typedef struct duk_heap duk_heap; +typedef struct duk_breakpoint duk_breakpoint; + +typedef struct duk_activation duk_activation; +typedef struct duk_catcher duk_catcher; +typedef struct duk_ljstate duk_ljstate; +typedef struct duk_strcache_entry duk_strcache_entry; +typedef struct duk_litcache_entry duk_litcache_entry; +typedef struct duk_strtab_entry duk_strtab_entry; + +#if defined(DUK_USE_DEBUG) +typedef struct duk_fixedbuffer duk_fixedbuffer; +#endif + +typedef struct duk_bitdecoder_ctx duk_bitdecoder_ctx; +typedef struct duk_bitencoder_ctx duk_bitencoder_ctx; +typedef struct duk_bufwriter_ctx duk_bufwriter_ctx; + +typedef struct duk_token duk_token; +typedef struct duk_re_token duk_re_token; +typedef struct duk_lexer_point duk_lexer_point; +typedef struct duk_lexer_ctx duk_lexer_ctx; +typedef struct duk_lexer_codepoint duk_lexer_codepoint; + +typedef struct duk_compiler_instr duk_compiler_instr; +typedef struct duk_compiler_func duk_compiler_func; +typedef struct duk_compiler_ctx duk_compiler_ctx; + +typedef struct duk_re_matcher_ctx duk_re_matcher_ctx; +typedef struct duk_re_compiler_ctx duk_re_compiler_ctx; + +#endif /* DUK_FORWDECL_H_INCLUDED */ +/* #include duk_tval.h */ +#line 1 "duk_tval.h" +/* + * Tagged type definition (duk_tval) and accessor macros. + * + * Access all fields through the accessor macros, as the representation + * is quite tricky. + * + * There are two packed type alternatives: an 8-byte representation + * based on an IEEE double (preferred for compactness), and a 12-byte + * representation (portability). The latter is needed also in e.g. + * 64-bit environments (it usually pads to 16 bytes per value). + * + * Selecting the tagged type format involves many trade-offs (memory + * use, size and performance of generated code, portability, etc). + * + * NB: because macro arguments are often expressions, macros should + * avoid evaluating their argument more than once. + */ + +#if !defined(DUK_TVAL_H_INCLUDED) +#define DUK_TVAL_H_INCLUDED + +/* sanity */ +#if !defined(DUK_USE_DOUBLE_LE) && !defined(DUK_USE_DOUBLE_ME) && !defined(DUK_USE_DOUBLE_BE) +#error unsupported: cannot determine byte order variant +#endif + +#if defined(DUK_USE_PACKED_TVAL) +/* ======================================================================== */ + +/* + * Packed 8-byte representation + */ + +/* use duk_double_union as duk_tval directly */ +typedef union duk_double_union duk_tval; +typedef struct { + duk_uint16_t a; + duk_uint16_t b; + duk_uint16_t c; + duk_uint16_t d; +} duk_tval_unused; + +/* tags */ +#define DUK_TAG_NORMALIZED_NAN 0x7ff8UL /* the NaN variant we use */ +/* avoid tag 0xfff0, no risk of confusion with negative infinity */ +#define DUK_TAG_MIN 0xfff1UL +#if defined(DUK_USE_FASTINT) +#define DUK_TAG_FASTINT 0xfff1UL /* embed: integer value */ +#endif +#define DUK_TAG_UNUSED 0xfff2UL /* marker; not actual tagged value */ +#define DUK_TAG_UNDEFINED 0xfff3UL /* embed: nothing */ +#define DUK_TAG_NULL 0xfff4UL /* embed: nothing */ +#define DUK_TAG_BOOLEAN 0xfff5UL /* embed: 0 or 1 (false or true) */ +/* DUK_TAG_NUMBER would logically go here, but it has multiple 'tags' */ +#define DUK_TAG_POINTER 0xfff6UL /* embed: void ptr */ +#define DUK_TAG_LIGHTFUNC 0xfff7UL /* embed: func ptr */ +#define DUK_TAG_STRING 0xfff8UL /* embed: duk_hstring ptr */ +#define DUK_TAG_OBJECT 0xfff9UL /* embed: duk_hobject ptr */ +#define DUK_TAG_BUFFER 0xfffaUL /* embed: duk_hbuffer ptr */ +#define DUK_TAG_MAX 0xfffaUL + +/* for convenience */ +#define DUK_XTAG_BOOLEAN_FALSE 0xfff50000UL +#define DUK_XTAG_BOOLEAN_TRUE 0xfff50001UL + +#define DUK_TVAL_IS_VALID_TAG(tv) \ + (DUK_TVAL_GET_TAG((tv)) - DUK_TAG_MIN <= DUK_TAG_MAX - DUK_TAG_MIN) + +/* DUK_TVAL_UNUSED initializer for duk_tval_unused, works for any endianness. */ +#define DUK_TVAL_UNUSED_INITIALIZER() \ + { DUK_TAG_UNUSED, DUK_TAG_UNUSED, DUK_TAG_UNUSED, DUK_TAG_UNUSED } + +/* two casts to avoid gcc warning: "warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]" */ +#if defined(DUK_USE_64BIT_OPS) +#if defined(DUK_USE_DOUBLE_ME) +#define DUK__TVAL_SET_TAGGEDPOINTER(tv,h,tag) do { \ + (tv)->ull[DUK_DBL_IDX_ULL0] = (((duk_uint64_t) (tag)) << 16) | (((duk_uint64_t) (duk_uint32_t) (h)) << 32); \ + } while (0) +#else +#define DUK__TVAL_SET_TAGGEDPOINTER(tv,h,tag) do { \ + (tv)->ull[DUK_DBL_IDX_ULL0] = (((duk_uint64_t) (tag)) << 48) | ((duk_uint64_t) (duk_uint32_t) (h)); \ + } while (0) +#endif +#else /* DUK_USE_64BIT_OPS */ +#define DUK__TVAL_SET_TAGGEDPOINTER(tv,h,tag) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->ui[DUK_DBL_IDX_UI0] = ((duk_uint32_t) (tag)) << 16; \ + duk__tv->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) (h); \ + } while (0) +#endif /* DUK_USE_64BIT_OPS */ + +#if defined(DUK_USE_64BIT_OPS) +/* Double casting for pointer to avoid gcc warning (cast from pointer to integer of different size) */ +#if defined(DUK_USE_DOUBLE_ME) +#define DUK__TVAL_SET_LIGHTFUNC(tv,fp,flags) do { \ + (tv)->ull[DUK_DBL_IDX_ULL0] = (((duk_uint64_t) DUK_TAG_LIGHTFUNC) << 16) | \ + ((duk_uint64_t) (flags)) | \ + (((duk_uint64_t) (duk_uint32_t) (fp)) << 32); \ + } while (0) +#else +#define DUK__TVAL_SET_LIGHTFUNC(tv,fp,flags) do { \ + (tv)->ull[DUK_DBL_IDX_ULL0] = (((duk_uint64_t) DUK_TAG_LIGHTFUNC) << 48) | \ + (((duk_uint64_t) (flags)) << 32) | \ + ((duk_uint64_t) (duk_uint32_t) (fp)); \ + } while (0) +#endif +#else /* DUK_USE_64BIT_OPS */ +#define DUK__TVAL_SET_LIGHTFUNC(tv,fp,flags) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->ui[DUK_DBL_IDX_UI0] = (((duk_uint32_t) DUK_TAG_LIGHTFUNC) << 16) | ((duk_uint32_t) (flags)); \ + duk__tv->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) (fp); \ + } while (0) +#endif /* DUK_USE_64BIT_OPS */ + +#if defined(DUK_USE_FASTINT) +/* Note: masking is done for 'i' to deal with negative numbers correctly */ +#if defined(DUK_USE_DOUBLE_ME) +#define DUK__TVAL_SET_I48(tv,i) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->ui[DUK_DBL_IDX_UI0] = ((duk_uint32_t) DUK_TAG_FASTINT) << 16 | (((duk_uint32_t) ((i) >> 32)) & 0x0000ffffUL); \ + duk__tv->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) (i); \ + } while (0) +#define DUK__TVAL_SET_U32(tv,i) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->ui[DUK_DBL_IDX_UI0] = ((duk_uint32_t) DUK_TAG_FASTINT) << 16; \ + duk__tv->ui[DUK_DBL_IDX_UI1] = (duk_uint32_t) (i); \ + } while (0) +#else +#define DUK__TVAL_SET_I48(tv,i) do { \ + (tv)->ull[DUK_DBL_IDX_ULL0] = (((duk_uint64_t) DUK_TAG_FASTINT) << 48) | (((duk_uint64_t) (i)) & DUK_U64_CONSTANT(0x0000ffffffffffff)); \ + } while (0) +#define DUK__TVAL_SET_U32(tv,i) do { \ + (tv)->ull[DUK_DBL_IDX_ULL0] = (((duk_uint64_t) DUK_TAG_FASTINT) << 48) | (duk_uint64_t) (i); \ + } while (0) +#endif + +/* This needs to go through a cast because sign extension is needed. */ +#define DUK__TVAL_SET_I32(tv,i) do { \ + duk_int64_t duk__tmp = (duk_int64_t) (i); \ + DUK_TVAL_SET_I48((tv), duk__tmp); \ + } while (0) + +/* XXX: Clumsy sign extend and masking of 16 topmost bits. */ +#if defined(DUK_USE_DOUBLE_ME) +#define DUK__TVAL_GET_FASTINT(tv) (((duk_int64_t) ((((duk_uint64_t) (tv)->ui[DUK_DBL_IDX_UI0]) << 32) | ((duk_uint64_t) (tv)->ui[DUK_DBL_IDX_UI1]))) << 16 >> 16) +#else +#define DUK__TVAL_GET_FASTINT(tv) ((((duk_int64_t) (tv)->ull[DUK_DBL_IDX_ULL0]) << 16) >> 16) +#endif +#define DUK__TVAL_GET_FASTINT_U32(tv) ((tv)->ui[DUK_DBL_IDX_UI1]) +#define DUK__TVAL_GET_FASTINT_I32(tv) ((duk_int32_t) (tv)->ui[DUK_DBL_IDX_UI1]) +#endif /* DUK_USE_FASTINT */ + +#define DUK_TVAL_SET_UNDEFINED(tv) do { \ + (tv)->us[DUK_DBL_IDX_US0] = (duk_uint16_t) DUK_TAG_UNDEFINED; \ + } while (0) +#define DUK_TVAL_SET_UNUSED(tv) do { \ + (tv)->us[DUK_DBL_IDX_US0] = (duk_uint16_t) DUK_TAG_UNUSED; \ + } while (0) +#define DUK_TVAL_SET_NULL(tv) do { \ + (tv)->us[DUK_DBL_IDX_US0] = (duk_uint16_t) DUK_TAG_NULL; \ + } while (0) + +#define DUK_TVAL_SET_BOOLEAN(tv,val) DUK_DBLUNION_SET_HIGH32((tv), (((duk_uint32_t) DUK_TAG_BOOLEAN) << 16) | ((duk_uint32_t) (val))) + +#define DUK_TVAL_SET_NAN(tv) DUK_DBLUNION_SET_NAN_FULL((tv)) + +/* Assumes that caller has normalized NaNs, otherwise trouble ahead. */ +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_SET_DOUBLE(tv,d) do { \ + duk_double_t duk__dblval; \ + duk__dblval = (d); \ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(duk__dblval); \ + DUK_DBLUNION_SET_DOUBLE((tv), duk__dblval); \ + } while (0) +#define DUK_TVAL_SET_I48(tv,i) DUK__TVAL_SET_I48((tv), (i)) +#define DUK_TVAL_SET_I32(tv,i) DUK__TVAL_SET_I32((tv), (i)) +#define DUK_TVAL_SET_U32(tv,i) DUK__TVAL_SET_U32((tv), (i)) +#define DUK_TVAL_SET_NUMBER_CHKFAST_FAST(tv,d) duk_tval_set_number_chkfast_fast((tv), (d)) +#define DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(tv,d) duk_tval_set_number_chkfast_slow((tv), (d)) +#define DUK_TVAL_SET_NUMBER(tv,d) DUK_TVAL_SET_DOUBLE((tv), (d)) +#define DUK_TVAL_CHKFAST_INPLACE_FAST(tv) do { \ + duk_tval *duk__tv; \ + duk_double_t duk__d; \ + duk__tv = (tv); \ + if (DUK_TVAL_IS_DOUBLE(duk__tv)) { \ + duk__d = DUK_TVAL_GET_DOUBLE(duk__tv); \ + DUK_TVAL_SET_NUMBER_CHKFAST_FAST(duk__tv, duk__d); \ + } \ + } while (0) +#define DUK_TVAL_CHKFAST_INPLACE_SLOW(tv) do { \ + duk_tval *duk__tv; \ + duk_double_t duk__d; \ + duk__tv = (tv); \ + if (DUK_TVAL_IS_DOUBLE(duk__tv)) { \ + duk__d = DUK_TVAL_GET_DOUBLE(duk__tv); \ + DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(duk__tv, duk__d); \ + } \ + } while (0) +#else /* DUK_USE_FASTINT */ +#define DUK_TVAL_SET_DOUBLE(tv,d) do { \ + duk_double_t duk__dblval; \ + duk__dblval = (d); \ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(duk__dblval); \ + DUK_DBLUNION_SET_DOUBLE((tv), duk__dblval); \ + } while (0) +#define DUK_TVAL_SET_I48(tv,i) DUK_TVAL_SET_DOUBLE((tv), (duk_double_t) (i)) /* XXX: fast int-to-double */ +#define DUK_TVAL_SET_I32(tv,i) DUK_TVAL_SET_DOUBLE((tv), (duk_double_t) (i)) +#define DUK_TVAL_SET_U32(tv,i) DUK_TVAL_SET_DOUBLE((tv), (duk_double_t) (i)) +#define DUK_TVAL_SET_NUMBER_CHKFAST_FAST(tv,d) DUK_TVAL_SET_DOUBLE((tv), (d)) +#define DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(tv,d) DUK_TVAL_SET_DOUBLE((tv), (d)) +#define DUK_TVAL_SET_NUMBER(tv,d) DUK_TVAL_SET_DOUBLE((tv), (d)) +#define DUK_TVAL_CHKFAST_INPLACE_FAST(tv) do { } while (0) +#define DUK_TVAL_CHKFAST_INPLACE_SLOW(tv) do { } while (0) +#endif /* DUK_USE_FASTINT */ + +#define DUK_TVAL_SET_FASTINT(tv,i) DUK_TVAL_SET_I48((tv), (i)) /* alias */ + +#define DUK_TVAL_SET_LIGHTFUNC(tv,fp,flags) DUK__TVAL_SET_LIGHTFUNC((tv), (fp), (flags)) +#define DUK_TVAL_SET_STRING(tv,h) DUK__TVAL_SET_TAGGEDPOINTER((tv), (h), DUK_TAG_STRING) +#define DUK_TVAL_SET_OBJECT(tv,h) DUK__TVAL_SET_TAGGEDPOINTER((tv), (h), DUK_TAG_OBJECT) +#define DUK_TVAL_SET_BUFFER(tv,h) DUK__TVAL_SET_TAGGEDPOINTER((tv), (h), DUK_TAG_BUFFER) +#define DUK_TVAL_SET_POINTER(tv,p) DUK__TVAL_SET_TAGGEDPOINTER((tv), (p), DUK_TAG_POINTER) + +#define DUK_TVAL_SET_TVAL(tv,x) do { *(tv) = *(x); } while (0) + +/* getters */ +#define DUK_TVAL_GET_BOOLEAN(tv) ((duk_small_uint_t) (tv)->us[DUK_DBL_IDX_US1]) +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_GET_DOUBLE(tv) ((tv)->d) +#define DUK_TVAL_GET_FASTINT(tv) DUK__TVAL_GET_FASTINT((tv)) +#define DUK_TVAL_GET_FASTINT_U32(tv) DUK__TVAL_GET_FASTINT_U32((tv)) +#define DUK_TVAL_GET_FASTINT_I32(tv) DUK__TVAL_GET_FASTINT_I32((tv)) +#define DUK_TVAL_GET_NUMBER(tv) duk_tval_get_number_packed((tv)) +#else +#define DUK_TVAL_GET_NUMBER(tv) ((tv)->d) +#define DUK_TVAL_GET_DOUBLE(tv) ((tv)->d) +#endif +#define DUK_TVAL_GET_LIGHTFUNC(tv,out_fp,out_flags) do { \ + (out_flags) = (tv)->ui[DUK_DBL_IDX_UI0] & 0xffffUL; \ + (out_fp) = (duk_c_function) (tv)->ui[DUK_DBL_IDX_UI1]; \ + } while (0) +#define DUK_TVAL_GET_LIGHTFUNC_FUNCPTR(tv) ((duk_c_function) ((tv)->ui[DUK_DBL_IDX_UI1])) +#define DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv) (((duk_small_uint_t) (tv)->ui[DUK_DBL_IDX_UI0]) & 0xffffUL) +#define DUK_TVAL_GET_STRING(tv) ((duk_hstring *) (tv)->vp[DUK_DBL_IDX_VP1]) +#define DUK_TVAL_GET_OBJECT(tv) ((duk_hobject *) (tv)->vp[DUK_DBL_IDX_VP1]) +#define DUK_TVAL_GET_BUFFER(tv) ((duk_hbuffer *) (tv)->vp[DUK_DBL_IDX_VP1]) +#define DUK_TVAL_GET_POINTER(tv) ((void *) (tv)->vp[DUK_DBL_IDX_VP1]) +#define DUK_TVAL_GET_HEAPHDR(tv) ((duk_heaphdr *) (tv)->vp[DUK_DBL_IDX_VP1]) + +/* decoding */ +#define DUK_TVAL_GET_TAG(tv) ((duk_small_uint_t) (tv)->us[DUK_DBL_IDX_US0]) + +#define DUK_TVAL_IS_UNDEFINED(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_UNDEFINED) +#define DUK_TVAL_IS_UNUSED(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_UNUSED) +#define DUK_TVAL_IS_NULL(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_NULL) +#define DUK_TVAL_IS_BOOLEAN(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_BOOLEAN) +#define DUK_TVAL_IS_BOOLEAN_TRUE(tv) ((tv)->ui[DUK_DBL_IDX_UI0] == DUK_XTAG_BOOLEAN_TRUE) +#define DUK_TVAL_IS_BOOLEAN_FALSE(tv) ((tv)->ui[DUK_DBL_IDX_UI0] == DUK_XTAG_BOOLEAN_FALSE) +#define DUK_TVAL_IS_LIGHTFUNC(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_LIGHTFUNC) +#define DUK_TVAL_IS_STRING(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_STRING) +#define DUK_TVAL_IS_OBJECT(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_OBJECT) +#define DUK_TVAL_IS_BUFFER(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_BUFFER) +#define DUK_TVAL_IS_POINTER(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_POINTER) +#if defined(DUK_USE_FASTINT) +/* 0xfff0 is -Infinity */ +#define DUK_TVAL_IS_DOUBLE(tv) (DUK_TVAL_GET_TAG((tv)) <= 0xfff0UL) +#define DUK_TVAL_IS_FASTINT(tv) (DUK_TVAL_GET_TAG((tv)) == DUK_TAG_FASTINT) +#define DUK_TVAL_IS_NUMBER(tv) (DUK_TVAL_GET_TAG((tv)) <= 0xfff1UL) +#else +#define DUK_TVAL_IS_NUMBER(tv) (DUK_TVAL_GET_TAG((tv)) <= 0xfff0UL) +#define DUK_TVAL_IS_DOUBLE(tv) DUK_TVAL_IS_NUMBER((tv)) +#endif + +/* This is performance critical because it appears in every DECREF. */ +#define DUK_TVAL_IS_HEAP_ALLOCATED(tv) (DUK_TVAL_GET_TAG((tv)) >= DUK_TAG_STRING) + +#if defined(DUK_USE_FASTINT) +DUK_INTERNAL_DECL duk_double_t duk_tval_get_number_packed(duk_tval *tv); +#endif + +#else /* DUK_USE_PACKED_TVAL */ +/* ======================================================================== */ + +/* + * Portable 12-byte representation + */ + +/* Note: not initializing all bytes is normally not an issue: Duktape won't + * read or use the uninitialized bytes so valgrind won't issue warnings. + * In some special cases a harmless valgrind warning may be issued though. + * For example, the DumpHeap debugger command writes out a compiled function's + * 'data' area as is, including any uninitialized bytes, which causes a + * valgrind warning. + */ + +typedef struct duk_tval_struct duk_tval; + +struct duk_tval_struct { + duk_small_uint_t t; + duk_small_uint_t v_extra; + union { + duk_double_t d; + duk_small_int_t i; +#if defined(DUK_USE_FASTINT) + duk_int64_t fi; /* if present, forces 16-byte duk_tval */ +#endif + void *voidptr; + duk_hstring *hstring; + duk_hobject *hobject; + duk_hcompfunc *hcompfunc; + duk_hnatfunc *hnatfunc; + duk_hthread *hthread; + duk_hbuffer *hbuffer; + duk_heaphdr *heaphdr; + duk_c_function lightfunc; + } v; +}; + +typedef struct { + duk_small_uint_t t; + duk_small_uint_t v_extra; + /* The rest of the fields don't matter except for debug dumps and such + * for which a partial initializer may trigger out-ot-bounds memory + * reads. Include a double field which is usually as large or larger + * than pointers (not always however). + */ + duk_double_t d; +} duk_tval_unused; + +#define DUK_TVAL_UNUSED_INITIALIZER() \ + { DUK_TAG_UNUSED, 0, 0.0 } + +#define DUK_TAG_MIN 0 +#define DUK_TAG_NUMBER 0 /* DUK_TAG_NUMBER only defined for non-packed duk_tval */ +#if defined(DUK_USE_FASTINT) +#define DUK_TAG_FASTINT 1 +#endif +#define DUK_TAG_UNDEFINED 2 +#define DUK_TAG_NULL 3 +#define DUK_TAG_BOOLEAN 4 +#define DUK_TAG_POINTER 5 +#define DUK_TAG_LIGHTFUNC 6 +#define DUK_TAG_UNUSED 7 /* marker; not actual tagged type */ +#define DUK_TAG_STRING 8 /* first heap allocated, match bit boundary */ +#define DUK_TAG_OBJECT 9 +#define DUK_TAG_BUFFER 10 +#define DUK_TAG_MAX 10 + +#define DUK_TVAL_IS_VALID_TAG(tv) \ + (DUK_TVAL_GET_TAG((tv)) - DUK_TAG_MIN <= DUK_TAG_MAX - DUK_TAG_MIN) + +/* DUK_TAG_NUMBER is intentionally first, as it is the default clause in code + * to support the 8-byte representation. Further, it is a non-heap-allocated + * type so it should come before DUK_TAG_STRING. Finally, it should not break + * the tag value ranges covered by case-clauses in a switch-case. + */ + +/* setters */ +#define DUK_TVAL_SET_UNDEFINED(tv) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_UNDEFINED; \ + } while (0) + +#define DUK_TVAL_SET_UNUSED(tv) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_UNUSED; \ + } while (0) + +#define DUK_TVAL_SET_NULL(tv) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_NULL; \ + } while (0) + +#define DUK_TVAL_SET_BOOLEAN(tv,val) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_BOOLEAN; \ + duk__tv->v.i = (duk_small_int_t) (val); \ + } while (0) + +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_SET_DOUBLE(tv,val) do { \ + duk_tval *duk__tv; \ + duk_double_t duk__dblval; \ + duk__dblval = (val); \ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(duk__dblval); /* nop for unpacked duk_tval */ \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_NUMBER; \ + duk__tv->v.d = duk__dblval; \ + } while (0) +#define DUK_TVAL_SET_I48(tv,val) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_FASTINT; \ + duk__tv->v.fi = (val); \ + } while (0) +#define DUK_TVAL_SET_U32(tv,val) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_FASTINT; \ + duk__tv->v.fi = (duk_int64_t) (val); \ + } while (0) +#define DUK_TVAL_SET_I32(tv,val) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_FASTINT; \ + duk__tv->v.fi = (duk_int64_t) (val); \ + } while (0) +#define DUK_TVAL_SET_NUMBER_CHKFAST_FAST(tv,d) \ + duk_tval_set_number_chkfast_fast((tv), (d)) +#define DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(tv,d) \ + duk_tval_set_number_chkfast_slow((tv), (d)) +#define DUK_TVAL_SET_NUMBER(tv,val) \ + DUK_TVAL_SET_DOUBLE((tv), (val)) +#define DUK_TVAL_CHKFAST_INPLACE_FAST(tv) do { \ + duk_tval *duk__tv; \ + duk_double_t duk__d; \ + duk__tv = (tv); \ + if (DUK_TVAL_IS_DOUBLE(duk__tv)) { \ + duk__d = DUK_TVAL_GET_DOUBLE(duk__tv); \ + DUK_TVAL_SET_NUMBER_CHKFAST_FAST(duk__tv, duk__d); \ + } \ + } while (0) +#define DUK_TVAL_CHKFAST_INPLACE_SLOW(tv) do { \ + duk_tval *duk__tv; \ + duk_double_t duk__d; \ + duk__tv = (tv); \ + if (DUK_TVAL_IS_DOUBLE(duk__tv)) { \ + duk__d = DUK_TVAL_GET_DOUBLE(duk__tv); \ + DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(duk__tv, duk__d); \ + } \ + } while (0) +#else /* DUK_USE_FASTINT */ +#define DUK_TVAL_SET_DOUBLE(tv,d) \ + DUK_TVAL_SET_NUMBER((tv), (d)) +#define DUK_TVAL_SET_I48(tv,val) \ + DUK_TVAL_SET_NUMBER((tv), (duk_double_t) (val)) /* XXX: fast int-to-double */ +#define DUK_TVAL_SET_U32(tv,val) \ + DUK_TVAL_SET_NUMBER((tv), (duk_double_t) (val)) +#define DUK_TVAL_SET_I32(tv,val) \ + DUK_TVAL_SET_NUMBER((tv), (duk_double_t) (val)) +#define DUK_TVAL_SET_NUMBER(tv,val) do { \ + duk_tval *duk__tv; \ + duk_double_t duk__dblval; \ + duk__dblval = (val); \ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(duk__dblval); /* nop for unpacked duk_tval */ \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_NUMBER; \ + duk__tv->v.d = duk__dblval; \ + } while (0) +#define DUK_TVAL_SET_NUMBER_CHKFAST_FAST(tv,d) \ + DUK_TVAL_SET_NUMBER((tv), (d)) +#define DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(tv,d) \ + DUK_TVAL_SET_NUMBER((tv), (d)) +#define DUK_TVAL_CHKFAST_INPLACE_FAST(tv) do { } while (0) +#define DUK_TVAL_CHKFAST_INPLACE_SLOW(tv) do { } while (0) +#endif /* DUK_USE_FASTINT */ + +#define DUK_TVAL_SET_FASTINT(tv,i) \ + DUK_TVAL_SET_I48((tv), (i)) /* alias */ + +#define DUK_TVAL_SET_POINTER(tv,hptr) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_POINTER; \ + duk__tv->v.voidptr = (hptr); \ + } while (0) + +#define DUK_TVAL_SET_LIGHTFUNC(tv,fp,flags) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_LIGHTFUNC; \ + duk__tv->v_extra = (flags); \ + duk__tv->v.lightfunc = (duk_c_function) (fp); \ + } while (0) + +#define DUK_TVAL_SET_STRING(tv,hptr) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_STRING; \ + duk__tv->v.hstring = (hptr); \ + } while (0) + +#define DUK_TVAL_SET_OBJECT(tv,hptr) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_OBJECT; \ + duk__tv->v.hobject = (hptr); \ + } while (0) + +#define DUK_TVAL_SET_BUFFER(tv,hptr) do { \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_BUFFER; \ + duk__tv->v.hbuffer = (hptr); \ + } while (0) + +#define DUK_TVAL_SET_NAN(tv) do { \ + /* in non-packed representation we don't care about which NaN is used */ \ + duk_tval *duk__tv; \ + duk__tv = (tv); \ + duk__tv->t = DUK_TAG_NUMBER; \ + duk__tv->v.d = DUK_DOUBLE_NAN; \ + } while (0) + +#define DUK_TVAL_SET_TVAL(tv,x) do { *(tv) = *(x); } while (0) + +/* getters */ +#define DUK_TVAL_GET_BOOLEAN(tv) ((duk_small_uint_t) (tv)->v.i) +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_GET_DOUBLE(tv) ((tv)->v.d) +#define DUK_TVAL_GET_FASTINT(tv) ((tv)->v.fi) +#define DUK_TVAL_GET_FASTINT_U32(tv) ((duk_uint32_t) ((tv)->v.fi)) +#define DUK_TVAL_GET_FASTINT_I32(tv) ((duk_int32_t) ((tv)->v.fi)) +#if 0 +#define DUK_TVAL_GET_NUMBER(tv) (DUK_TVAL_IS_FASTINT((tv)) ? \ + (duk_double_t) DUK_TVAL_GET_FASTINT((tv)) : \ + DUK_TVAL_GET_DOUBLE((tv))) +#define DUK_TVAL_GET_NUMBER(tv) duk_tval_get_number_unpacked((tv)) +#else +/* This seems reasonable overall. */ +#define DUK_TVAL_GET_NUMBER(tv) (DUK_TVAL_IS_FASTINT((tv)) ? \ + duk_tval_get_number_unpacked_fastint((tv)) : \ + DUK_TVAL_GET_DOUBLE((tv))) +#endif +#else +#define DUK_TVAL_GET_NUMBER(tv) ((tv)->v.d) +#define DUK_TVAL_GET_DOUBLE(tv) ((tv)->v.d) +#endif /* DUK_USE_FASTINT */ +#define DUK_TVAL_GET_POINTER(tv) ((tv)->v.voidptr) +#define DUK_TVAL_GET_LIGHTFUNC(tv,out_fp,out_flags) do { \ + (out_flags) = (duk_uint32_t) (tv)->v_extra; \ + (out_fp) = (tv)->v.lightfunc; \ + } while (0) +#define DUK_TVAL_GET_LIGHTFUNC_FUNCPTR(tv) ((tv)->v.lightfunc) +#define DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv) ((duk_small_uint_t) ((tv)->v_extra)) +#define DUK_TVAL_GET_STRING(tv) ((tv)->v.hstring) +#define DUK_TVAL_GET_OBJECT(tv) ((tv)->v.hobject) +#define DUK_TVAL_GET_BUFFER(tv) ((tv)->v.hbuffer) +#define DUK_TVAL_GET_HEAPHDR(tv) ((tv)->v.heaphdr) + +/* decoding */ +#define DUK_TVAL_GET_TAG(tv) ((tv)->t) +#define DUK_TVAL_IS_UNDEFINED(tv) ((tv)->t == DUK_TAG_UNDEFINED) +#define DUK_TVAL_IS_UNUSED(tv) ((tv)->t == DUK_TAG_UNUSED) +#define DUK_TVAL_IS_NULL(tv) ((tv)->t == DUK_TAG_NULL) +#define DUK_TVAL_IS_BOOLEAN(tv) ((tv)->t == DUK_TAG_BOOLEAN) +#define DUK_TVAL_IS_BOOLEAN_TRUE(tv) (((tv)->t == DUK_TAG_BOOLEAN) && ((tv)->v.i != 0)) +#define DUK_TVAL_IS_BOOLEAN_FALSE(tv) (((tv)->t == DUK_TAG_BOOLEAN) && ((tv)->v.i == 0)) +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_IS_DOUBLE(tv) ((tv)->t == DUK_TAG_NUMBER) +#define DUK_TVAL_IS_FASTINT(tv) ((tv)->t == DUK_TAG_FASTINT) +#define DUK_TVAL_IS_NUMBER(tv) ((tv)->t == DUK_TAG_NUMBER || \ + (tv)->t == DUK_TAG_FASTINT) +#else +#define DUK_TVAL_IS_NUMBER(tv) ((tv)->t == DUK_TAG_NUMBER) +#define DUK_TVAL_IS_DOUBLE(tv) DUK_TVAL_IS_NUMBER((tv)) +#endif /* DUK_USE_FASTINT */ +#define DUK_TVAL_IS_POINTER(tv) ((tv)->t == DUK_TAG_POINTER) +#define DUK_TVAL_IS_LIGHTFUNC(tv) ((tv)->t == DUK_TAG_LIGHTFUNC) +#define DUK_TVAL_IS_STRING(tv) ((tv)->t == DUK_TAG_STRING) +#define DUK_TVAL_IS_OBJECT(tv) ((tv)->t == DUK_TAG_OBJECT) +#define DUK_TVAL_IS_BUFFER(tv) ((tv)->t == DUK_TAG_BUFFER) + +/* This is performance critical because it's needed for every DECREF. + * Take advantage of the fact that the first heap allocated tag is 8, + * so that bit 3 is set for all heap allocated tags (and never set for + * non-heap-allocated tags). + */ +#if 0 +#define DUK_TVAL_IS_HEAP_ALLOCATED(tv) ((tv)->t >= DUK_TAG_STRING) +#endif +#define DUK_TVAL_IS_HEAP_ALLOCATED(tv) ((tv)->t & 0x08) + +#if defined(DUK_USE_FASTINT) +#if 0 +DUK_INTERNAL_DECL duk_double_t duk_tval_get_number_unpacked(duk_tval *tv); +#endif +DUK_INTERNAL_DECL duk_double_t duk_tval_get_number_unpacked_fastint(duk_tval *tv); +#endif + +#endif /* DUK_USE_PACKED_TVAL */ + +/* + * Convenience (independent of representation) + */ + +#define DUK_TVAL_SET_BOOLEAN_TRUE(tv) DUK_TVAL_SET_BOOLEAN((tv), 1) +#define DUK_TVAL_SET_BOOLEAN_FALSE(tv) DUK_TVAL_SET_BOOLEAN((tv), 0) + +#define DUK_TVAL_STRING_IS_SYMBOL(tv) \ + DUK_HSTRING_HAS_SYMBOL(DUK_TVAL_GET_STRING((tv))) + +/* Lightfunc flags packing and unpacking. */ +/* Sign extend: 0x0000##00 -> 0x##000000 -> sign extend to 0xssssss##. + * Avoid signed shifts due to portability limitations. + */ +#define DUK_LFUNC_FLAGS_GET_MAGIC(lf_flags) \ + ((duk_int32_t) (duk_int8_t) (((duk_uint16_t) (lf_flags)) >> 8)) +#define DUK_LFUNC_FLAGS_GET_LENGTH(lf_flags) \ + (((lf_flags) >> 4) & 0x0fU) +#define DUK_LFUNC_FLAGS_GET_NARGS(lf_flags) \ + ((lf_flags) & 0x0fU) +#define DUK_LFUNC_FLAGS_PACK(magic,length,nargs) \ + ((((duk_small_uint_t) (magic)) & 0xffU) << 8) | ((length) << 4) | (nargs) + +#define DUK_LFUNC_NARGS_VARARGS 0x0f /* varargs marker */ +#define DUK_LFUNC_NARGS_MIN 0x00 +#define DUK_LFUNC_NARGS_MAX 0x0e /* max, excl. varargs marker */ +#define DUK_LFUNC_LENGTH_MIN 0x00 +#define DUK_LFUNC_LENGTH_MAX 0x0f +#define DUK_LFUNC_MAGIC_MIN (-0x80) +#define DUK_LFUNC_MAGIC_MAX 0x7f + +/* fastint constants etc */ +#if defined(DUK_USE_FASTINT) +#define DUK_FASTINT_MIN (DUK_I64_CONSTANT(-0x800000000000)) +#define DUK_FASTINT_MAX (DUK_I64_CONSTANT(0x7fffffffffff)) +#define DUK_FASTINT_BITS 48 + +DUK_INTERNAL_DECL void duk_tval_set_number_chkfast_fast(duk_tval *tv, duk_double_t x); +DUK_INTERNAL_DECL void duk_tval_set_number_chkfast_slow(duk_tval *tv, duk_double_t x); +#endif + +#endif /* DUK_TVAL_H_INCLUDED */ +/* #include duk_builtins.h */ +#line 1 "duk_builtins.h" +/* + * Automatically generated by genbuiltins.py, do not edit! + */ + +#if !defined(DUK_BUILTINS_H_INCLUDED) +#define DUK_BUILTINS_H_INCLUDED + +#if defined(DUK_USE_ROM_STRINGS) +#error ROM support not enabled, rerun configure.py with --rom-support +#else /* DUK_USE_ROM_STRINGS */ +#define DUK_STRIDX_UC_UNDEFINED 0 /* 'Undefined' */ +#define DUK_HEAP_STRING_UC_UNDEFINED(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_UNDEFINED) +#define DUK_HTHREAD_STRING_UC_UNDEFINED(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_UNDEFINED) +#define DUK_STRIDX_UC_NULL 1 /* 'Null' */ +#define DUK_HEAP_STRING_UC_NULL(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_NULL) +#define DUK_HTHREAD_STRING_UC_NULL(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_NULL) +#define DUK_STRIDX_UC_SYMBOL 2 /* 'Symbol' */ +#define DUK_HEAP_STRING_UC_SYMBOL(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_SYMBOL) +#define DUK_HTHREAD_STRING_UC_SYMBOL(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_SYMBOL) +#define DUK_STRIDX_UC_ARGUMENTS 3 /* 'Arguments' */ +#define DUK_HEAP_STRING_UC_ARGUMENTS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_ARGUMENTS) +#define DUK_HTHREAD_STRING_UC_ARGUMENTS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_ARGUMENTS) +#define DUK_STRIDX_UC_OBJECT 4 /* 'Object' */ +#define DUK_HEAP_STRING_UC_OBJECT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_OBJECT) +#define DUK_HTHREAD_STRING_UC_OBJECT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_OBJECT) +#define DUK_STRIDX_UC_FUNCTION 5 /* 'Function' */ +#define DUK_HEAP_STRING_UC_FUNCTION(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_FUNCTION) +#define DUK_HTHREAD_STRING_UC_FUNCTION(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_FUNCTION) +#define DUK_STRIDX_ARRAY 6 /* 'Array' */ +#define DUK_HEAP_STRING_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ARRAY) +#define DUK_HTHREAD_STRING_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ARRAY) +#define DUK_STRIDX_UC_STRING 7 /* 'String' */ +#define DUK_HEAP_STRING_UC_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_STRING) +#define DUK_HTHREAD_STRING_UC_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_STRING) +#define DUK_STRIDX_UC_BOOLEAN 8 /* 'Boolean' */ +#define DUK_HEAP_STRING_UC_BOOLEAN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_BOOLEAN) +#define DUK_HTHREAD_STRING_UC_BOOLEAN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_BOOLEAN) +#define DUK_STRIDX_UC_NUMBER 9 /* 'Number' */ +#define DUK_HEAP_STRING_UC_NUMBER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_NUMBER) +#define DUK_HTHREAD_STRING_UC_NUMBER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_NUMBER) +#define DUK_STRIDX_DATE 10 /* 'Date' */ +#define DUK_HEAP_STRING_DATE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DATE) +#define DUK_HTHREAD_STRING_DATE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DATE) +#define DUK_STRIDX_REG_EXP 11 /* 'RegExp' */ +#define DUK_HEAP_STRING_REG_EXP(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_REG_EXP) +#define DUK_HTHREAD_STRING_REG_EXP(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_REG_EXP) +#define DUK_STRIDX_UC_ERROR 12 /* 'Error' */ +#define DUK_HEAP_STRING_UC_ERROR(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_ERROR) +#define DUK_HTHREAD_STRING_UC_ERROR(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_ERROR) +#define DUK_STRIDX_MATH 13 /* 'Math' */ +#define DUK_HEAP_STRING_MATH(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_MATH) +#define DUK_HTHREAD_STRING_MATH(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_MATH) +#define DUK_STRIDX_JSON 14 /* 'JSON' */ +#define DUK_HEAP_STRING_JSON(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON) +#define DUK_HTHREAD_STRING_JSON(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON) +#define DUK_STRIDX_EMPTY_STRING 15 /* '' */ +#define DUK_HEAP_STRING_EMPTY_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_EMPTY_STRING) +#define DUK_HTHREAD_STRING_EMPTY_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_EMPTY_STRING) +#define DUK_STRIDX_ARRAY_BUFFER 16 /* 'ArrayBuffer' */ +#define DUK_HEAP_STRING_ARRAY_BUFFER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ARRAY_BUFFER) +#define DUK_HTHREAD_STRING_ARRAY_BUFFER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ARRAY_BUFFER) +#define DUK_STRIDX_DATA_VIEW 17 /* 'DataView' */ +#define DUK_HEAP_STRING_DATA_VIEW(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DATA_VIEW) +#define DUK_HTHREAD_STRING_DATA_VIEW(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DATA_VIEW) +#define DUK_STRIDX_INT8_ARRAY 18 /* 'Int8Array' */ +#define DUK_HEAP_STRING_INT8_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT8_ARRAY) +#define DUK_HTHREAD_STRING_INT8_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT8_ARRAY) +#define DUK_STRIDX_UINT8_ARRAY 19 /* 'Uint8Array' */ +#define DUK_HEAP_STRING_UINT8_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UINT8_ARRAY) +#define DUK_HTHREAD_STRING_UINT8_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UINT8_ARRAY) +#define DUK_STRIDX_UINT8_CLAMPED_ARRAY 20 /* 'Uint8ClampedArray' */ +#define DUK_HEAP_STRING_UINT8_CLAMPED_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UINT8_CLAMPED_ARRAY) +#define DUK_HTHREAD_STRING_UINT8_CLAMPED_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UINT8_CLAMPED_ARRAY) +#define DUK_STRIDX_INT16_ARRAY 21 /* 'Int16Array' */ +#define DUK_HEAP_STRING_INT16_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT16_ARRAY) +#define DUK_HTHREAD_STRING_INT16_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT16_ARRAY) +#define DUK_STRIDX_UINT16_ARRAY 22 /* 'Uint16Array' */ +#define DUK_HEAP_STRING_UINT16_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UINT16_ARRAY) +#define DUK_HTHREAD_STRING_UINT16_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UINT16_ARRAY) +#define DUK_STRIDX_INT32_ARRAY 23 /* 'Int32Array' */ +#define DUK_HEAP_STRING_INT32_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT32_ARRAY) +#define DUK_HTHREAD_STRING_INT32_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT32_ARRAY) +#define DUK_STRIDX_UINT32_ARRAY 24 /* 'Uint32Array' */ +#define DUK_HEAP_STRING_UINT32_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UINT32_ARRAY) +#define DUK_HTHREAD_STRING_UINT32_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UINT32_ARRAY) +#define DUK_STRIDX_FLOAT32_ARRAY 25 /* 'Float32Array' */ +#define DUK_HEAP_STRING_FLOAT32_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FLOAT32_ARRAY) +#define DUK_HTHREAD_STRING_FLOAT32_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FLOAT32_ARRAY) +#define DUK_STRIDX_FLOAT64_ARRAY 26 /* 'Float64Array' */ +#define DUK_HEAP_STRING_FLOAT64_ARRAY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FLOAT64_ARRAY) +#define DUK_HTHREAD_STRING_FLOAT64_ARRAY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FLOAT64_ARRAY) +#define DUK_STRIDX_GLOBAL 27 /* 'global' */ +#define DUK_HEAP_STRING_GLOBAL(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_GLOBAL) +#define DUK_HTHREAD_STRING_GLOBAL(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_GLOBAL) +#define DUK_STRIDX_OBJ_ENV 28 /* 'ObjEnv' */ +#define DUK_HEAP_STRING_OBJ_ENV(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_OBJ_ENV) +#define DUK_HTHREAD_STRING_OBJ_ENV(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_OBJ_ENV) +#define DUK_STRIDX_DEC_ENV 29 /* 'DecEnv' */ +#define DUK_HEAP_STRING_DEC_ENV(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DEC_ENV) +#define DUK_HTHREAD_STRING_DEC_ENV(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DEC_ENV) +#define DUK_STRIDX_UC_BUFFER 30 /* 'Buffer' */ +#define DUK_HEAP_STRING_UC_BUFFER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_BUFFER) +#define DUK_HTHREAD_STRING_UC_BUFFER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_BUFFER) +#define DUK_STRIDX_UC_POINTER 31 /* 'Pointer' */ +#define DUK_HEAP_STRING_UC_POINTER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_POINTER) +#define DUK_HTHREAD_STRING_UC_POINTER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_POINTER) +#define DUK_STRIDX_UC_THREAD 32 /* 'Thread' */ +#define DUK_HEAP_STRING_UC_THREAD(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_UC_THREAD) +#define DUK_HTHREAD_STRING_UC_THREAD(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_UC_THREAD) +#define DUK_STRIDX_EVAL 33 /* 'eval' */ +#define DUK_HEAP_STRING_EVAL(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_EVAL) +#define DUK_HTHREAD_STRING_EVAL(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_EVAL) +#define DUK_STRIDX_VALUE 34 /* 'value' */ +#define DUK_HEAP_STRING_VALUE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_VALUE) +#define DUK_HTHREAD_STRING_VALUE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_VALUE) +#define DUK_STRIDX_WRITABLE 35 /* 'writable' */ +#define DUK_HEAP_STRING_WRITABLE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WRITABLE) +#define DUK_HTHREAD_STRING_WRITABLE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WRITABLE) +#define DUK_STRIDX_CONFIGURABLE 36 /* 'configurable' */ +#define DUK_HEAP_STRING_CONFIGURABLE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CONFIGURABLE) +#define DUK_HTHREAD_STRING_CONFIGURABLE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CONFIGURABLE) +#define DUK_STRIDX_ENUMERABLE 37 /* 'enumerable' */ +#define DUK_HEAP_STRING_ENUMERABLE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ENUMERABLE) +#define DUK_HTHREAD_STRING_ENUMERABLE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ENUMERABLE) +#define DUK_STRIDX_JOIN 38 /* 'join' */ +#define DUK_HEAP_STRING_JOIN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JOIN) +#define DUK_HTHREAD_STRING_JOIN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JOIN) +#define DUK_STRIDX_TO_LOCALE_STRING 39 /* 'toLocaleString' */ +#define DUK_HEAP_STRING_TO_LOCALE_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TO_LOCALE_STRING) +#define DUK_HTHREAD_STRING_TO_LOCALE_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TO_LOCALE_STRING) +#define DUK_STRIDX_VALUE_OF 40 /* 'valueOf' */ +#define DUK_HEAP_STRING_VALUE_OF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_VALUE_OF) +#define DUK_HTHREAD_STRING_VALUE_OF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_VALUE_OF) +#define DUK_STRIDX_TO_UTC_STRING 41 /* 'toUTCString' */ +#define DUK_HEAP_STRING_TO_UTC_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TO_UTC_STRING) +#define DUK_HTHREAD_STRING_TO_UTC_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TO_UTC_STRING) +#define DUK_STRIDX_TO_ISO_STRING 42 /* 'toISOString' */ +#define DUK_HEAP_STRING_TO_ISO_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TO_ISO_STRING) +#define DUK_HTHREAD_STRING_TO_ISO_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TO_ISO_STRING) +#define DUK_STRIDX_TO_GMT_STRING 43 /* 'toGMTString' */ +#define DUK_HEAP_STRING_TO_GMT_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TO_GMT_STRING) +#define DUK_HTHREAD_STRING_TO_GMT_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TO_GMT_STRING) +#define DUK_STRIDX_SOURCE 44 /* 'source' */ +#define DUK_HEAP_STRING_SOURCE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_SOURCE) +#define DUK_HTHREAD_STRING_SOURCE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_SOURCE) +#define DUK_STRIDX_IGNORE_CASE 45 /* 'ignoreCase' */ +#define DUK_HEAP_STRING_IGNORE_CASE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_IGNORE_CASE) +#define DUK_HTHREAD_STRING_IGNORE_CASE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_IGNORE_CASE) +#define DUK_STRIDX_MULTILINE 46 /* 'multiline' */ +#define DUK_HEAP_STRING_MULTILINE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_MULTILINE) +#define DUK_HTHREAD_STRING_MULTILINE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_MULTILINE) +#define DUK_STRIDX_LAST_INDEX 47 /* 'lastIndex' */ +#define DUK_HEAP_STRING_LAST_INDEX(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LAST_INDEX) +#define DUK_HTHREAD_STRING_LAST_INDEX(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LAST_INDEX) +#define DUK_STRIDX_FLAGS 48 /* 'flags' */ +#define DUK_HEAP_STRING_FLAGS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FLAGS) +#define DUK_HTHREAD_STRING_FLAGS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FLAGS) +#define DUK_STRIDX_INDEX 49 /* 'index' */ +#define DUK_HEAP_STRING_INDEX(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INDEX) +#define DUK_HTHREAD_STRING_INDEX(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INDEX) +#define DUK_STRIDX_PROTOTYPE 50 /* 'prototype' */ +#define DUK_HEAP_STRING_PROTOTYPE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_PROTOTYPE) +#define DUK_HTHREAD_STRING_PROTOTYPE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_PROTOTYPE) +#define DUK_STRIDX_CONSTRUCTOR 51 /* 'constructor' */ +#define DUK_HEAP_STRING_CONSTRUCTOR(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CONSTRUCTOR) +#define DUK_HTHREAD_STRING_CONSTRUCTOR(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CONSTRUCTOR) +#define DUK_STRIDX_MESSAGE 52 /* 'message' */ +#define DUK_HEAP_STRING_MESSAGE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_MESSAGE) +#define DUK_HTHREAD_STRING_MESSAGE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_MESSAGE) +#define DUK_STRIDX_LC_BOOLEAN 53 /* 'boolean' */ +#define DUK_HEAP_STRING_LC_BOOLEAN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_BOOLEAN) +#define DUK_HTHREAD_STRING_LC_BOOLEAN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_BOOLEAN) +#define DUK_STRIDX_LC_NUMBER 54 /* 'number' */ +#define DUK_HEAP_STRING_LC_NUMBER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_NUMBER) +#define DUK_HTHREAD_STRING_LC_NUMBER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_NUMBER) +#define DUK_STRIDX_LC_STRING 55 /* 'string' */ +#define DUK_HEAP_STRING_LC_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_STRING) +#define DUK_HTHREAD_STRING_LC_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_STRING) +#define DUK_STRIDX_LC_SYMBOL 56 /* 'symbol' */ +#define DUK_HEAP_STRING_LC_SYMBOL(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_SYMBOL) +#define DUK_HTHREAD_STRING_LC_SYMBOL(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_SYMBOL) +#define DUK_STRIDX_LC_OBJECT 57 /* 'object' */ +#define DUK_HEAP_STRING_LC_OBJECT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_OBJECT) +#define DUK_HTHREAD_STRING_LC_OBJECT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_OBJECT) +#define DUK_STRIDX_LC_UNDEFINED 58 /* 'undefined' */ +#define DUK_HEAP_STRING_LC_UNDEFINED(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_UNDEFINED) +#define DUK_HTHREAD_STRING_LC_UNDEFINED(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_UNDEFINED) +#define DUK_STRIDX_NAN 59 /* 'NaN' */ +#define DUK_HEAP_STRING_NAN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_NAN) +#define DUK_HTHREAD_STRING_NAN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_NAN) +#define DUK_STRIDX_INFINITY 60 /* 'Infinity' */ +#define DUK_HEAP_STRING_INFINITY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INFINITY) +#define DUK_HTHREAD_STRING_INFINITY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INFINITY) +#define DUK_STRIDX_MINUS_INFINITY 61 /* '-Infinity' */ +#define DUK_HEAP_STRING_MINUS_INFINITY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_MINUS_INFINITY) +#define DUK_HTHREAD_STRING_MINUS_INFINITY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_MINUS_INFINITY) +#define DUK_STRIDX_MINUS_ZERO 62 /* '-0' */ +#define DUK_HEAP_STRING_MINUS_ZERO(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_MINUS_ZERO) +#define DUK_HTHREAD_STRING_MINUS_ZERO(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_MINUS_ZERO) +#define DUK_STRIDX_COMMA 63 /* ',' */ +#define DUK_HEAP_STRING_COMMA(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_COMMA) +#define DUK_HTHREAD_STRING_COMMA(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_COMMA) +#define DUK_STRIDX_NEWLINE_4SPACE 64 /* '\n ' */ +#define DUK_HEAP_STRING_NEWLINE_4SPACE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_NEWLINE_4SPACE) +#define DUK_HTHREAD_STRING_NEWLINE_4SPACE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_NEWLINE_4SPACE) +#define DUK_STRIDX_BRACKETED_ELLIPSIS 65 /* '[...]' */ +#define DUK_HEAP_STRING_BRACKETED_ELLIPSIS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_BRACKETED_ELLIPSIS) +#define DUK_HTHREAD_STRING_BRACKETED_ELLIPSIS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_BRACKETED_ELLIPSIS) +#define DUK_STRIDX_INVALID_DATE 66 /* 'Invalid Date' */ +#define DUK_HEAP_STRING_INVALID_DATE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INVALID_DATE) +#define DUK_HTHREAD_STRING_INVALID_DATE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INVALID_DATE) +#define DUK_STRIDX_LC_ARGUMENTS 67 /* 'arguments' */ +#define DUK_HEAP_STRING_LC_ARGUMENTS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_ARGUMENTS) +#define DUK_HTHREAD_STRING_LC_ARGUMENTS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_ARGUMENTS) +#define DUK_STRIDX_CALLEE 68 /* 'callee' */ +#define DUK_HEAP_STRING_CALLEE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CALLEE) +#define DUK_HTHREAD_STRING_CALLEE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CALLEE) +#define DUK_STRIDX_CALLER 69 /* 'caller' */ +#define DUK_HEAP_STRING_CALLER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CALLER) +#define DUK_HTHREAD_STRING_CALLER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CALLER) +#define DUK_STRIDX_APPLY 70 /* 'apply' */ +#define DUK_HEAP_STRING_APPLY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_APPLY) +#define DUK_HTHREAD_STRING_APPLY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_APPLY) +#define DUK_STRIDX_CONSTRUCT 71 /* 'construct' */ +#define DUK_HEAP_STRING_CONSTRUCT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CONSTRUCT) +#define DUK_HTHREAD_STRING_CONSTRUCT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CONSTRUCT) +#define DUK_STRIDX_DELETE_PROPERTY 72 /* 'deleteProperty' */ +#define DUK_HEAP_STRING_DELETE_PROPERTY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DELETE_PROPERTY) +#define DUK_HTHREAD_STRING_DELETE_PROPERTY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DELETE_PROPERTY) +#define DUK_STRIDX_GET 73 /* 'get' */ +#define DUK_HEAP_STRING_GET(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_GET) +#define DUK_HTHREAD_STRING_GET(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_GET) +#define DUK_STRIDX_HAS 74 /* 'has' */ +#define DUK_HEAP_STRING_HAS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_HAS) +#define DUK_HTHREAD_STRING_HAS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_HAS) +#define DUK_STRIDX_OWN_KEYS 75 /* 'ownKeys' */ +#define DUK_HEAP_STRING_OWN_KEYS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_OWN_KEYS) +#define DUK_HTHREAD_STRING_OWN_KEYS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_OWN_KEYS) +#define DUK_STRIDX_WELLKNOWN_SYMBOL_TO_PRIMITIVE 76 /* '\x81Symbol.toPrimitive\xff' */ +#define DUK_HEAP_STRING_WELLKNOWN_SYMBOL_TO_PRIMITIVE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WELLKNOWN_SYMBOL_TO_PRIMITIVE) +#define DUK_HTHREAD_STRING_WELLKNOWN_SYMBOL_TO_PRIMITIVE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WELLKNOWN_SYMBOL_TO_PRIMITIVE) +#define DUK_STRIDX_WELLKNOWN_SYMBOL_HAS_INSTANCE 77 /* '\x81Symbol.hasInstance\xff' */ +#define DUK_HEAP_STRING_WELLKNOWN_SYMBOL_HAS_INSTANCE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WELLKNOWN_SYMBOL_HAS_INSTANCE) +#define DUK_HTHREAD_STRING_WELLKNOWN_SYMBOL_HAS_INSTANCE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WELLKNOWN_SYMBOL_HAS_INSTANCE) +#define DUK_STRIDX_WELLKNOWN_SYMBOL_TO_STRING_TAG 78 /* '\x81Symbol.toStringTag\xff' */ +#define DUK_HEAP_STRING_WELLKNOWN_SYMBOL_TO_STRING_TAG(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WELLKNOWN_SYMBOL_TO_STRING_TAG) +#define DUK_HTHREAD_STRING_WELLKNOWN_SYMBOL_TO_STRING_TAG(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WELLKNOWN_SYMBOL_TO_STRING_TAG) +#define DUK_STRIDX_WELLKNOWN_SYMBOL_IS_CONCAT_SPREADABLE 79 /* '\x81Symbol.isConcatSpreadable\xff' */ +#define DUK_HEAP_STRING_WELLKNOWN_SYMBOL_IS_CONCAT_SPREADABLE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WELLKNOWN_SYMBOL_IS_CONCAT_SPREADABLE) +#define DUK_HTHREAD_STRING_WELLKNOWN_SYMBOL_IS_CONCAT_SPREADABLE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WELLKNOWN_SYMBOL_IS_CONCAT_SPREADABLE) +#define DUK_STRIDX_SET_PROTOTYPE_OF 80 /* 'setPrototypeOf' */ +#define DUK_HEAP_STRING_SET_PROTOTYPE_OF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_SET_PROTOTYPE_OF) +#define DUK_HTHREAD_STRING_SET_PROTOTYPE_OF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_SET_PROTOTYPE_OF) +#define DUK_STRIDX___PROTO__ 81 /* '__proto__' */ +#define DUK_HEAP_STRING___PROTO__(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX___PROTO__) +#define DUK_HTHREAD_STRING___PROTO__(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX___PROTO__) +#define DUK_STRIDX_TO_STRING 82 /* 'toString' */ +#define DUK_HEAP_STRING_TO_STRING(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TO_STRING) +#define DUK_HTHREAD_STRING_TO_STRING(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TO_STRING) +#define DUK_STRIDX_TO_JSON 83 /* 'toJSON' */ +#define DUK_HEAP_STRING_TO_JSON(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TO_JSON) +#define DUK_HTHREAD_STRING_TO_JSON(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TO_JSON) +#define DUK_STRIDX_TYPE 84 /* 'type' */ +#define DUK_HEAP_STRING_TYPE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TYPE) +#define DUK_HTHREAD_STRING_TYPE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TYPE) +#define DUK_STRIDX_DATA 85 /* 'data' */ +#define DUK_HEAP_STRING_DATA(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DATA) +#define DUK_HTHREAD_STRING_DATA(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DATA) +#define DUK_STRIDX_LENGTH 86 /* 'length' */ +#define DUK_HEAP_STRING_LENGTH(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LENGTH) +#define DUK_HTHREAD_STRING_LENGTH(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LENGTH) +#define DUK_STRIDX_SET 87 /* 'set' */ +#define DUK_HEAP_STRING_SET(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_SET) +#define DUK_HTHREAD_STRING_SET(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_SET) +#define DUK_STRIDX_STACK 88 /* 'stack' */ +#define DUK_HEAP_STRING_STACK(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_STACK) +#define DUK_HTHREAD_STRING_STACK(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_STACK) +#define DUK_STRIDX_PC 89 /* 'pc' */ +#define DUK_HEAP_STRING_PC(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_PC) +#define DUK_HTHREAD_STRING_PC(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_PC) +#define DUK_STRIDX_LINE_NUMBER 90 /* 'lineNumber' */ +#define DUK_HEAP_STRING_LINE_NUMBER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LINE_NUMBER) +#define DUK_HTHREAD_STRING_LINE_NUMBER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LINE_NUMBER) +#define DUK_STRIDX_INT_TRACEDATA 91 /* '\x82Tracedata' */ +#define DUK_HEAP_STRING_INT_TRACEDATA(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_TRACEDATA) +#define DUK_HTHREAD_STRING_INT_TRACEDATA(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_TRACEDATA) +#define DUK_STRIDX_NAME 92 /* 'name' */ +#define DUK_HEAP_STRING_NAME(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_NAME) +#define DUK_HTHREAD_STRING_NAME(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_NAME) +#define DUK_STRIDX_FILE_NAME 93 /* 'fileName' */ +#define DUK_HEAP_STRING_FILE_NAME(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FILE_NAME) +#define DUK_HTHREAD_STRING_FILE_NAME(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FILE_NAME) +#define DUK_STRIDX_LC_POINTER 94 /* 'pointer' */ +#define DUK_HEAP_STRING_LC_POINTER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_POINTER) +#define DUK_HTHREAD_STRING_LC_POINTER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_POINTER) +#define DUK_STRIDX_INT_TARGET 95 /* '\x82Target' */ +#define DUK_HEAP_STRING_INT_TARGET(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_TARGET) +#define DUK_HTHREAD_STRING_INT_TARGET(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_TARGET) +#define DUK_STRIDX_INT_NEXT 96 /* '\x82Next' */ +#define DUK_HEAP_STRING_INT_NEXT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_NEXT) +#define DUK_HTHREAD_STRING_INT_NEXT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_NEXT) +#define DUK_STRIDX_INT_BYTECODE 97 /* '\x82Bytecode' */ +#define DUK_HEAP_STRING_INT_BYTECODE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_BYTECODE) +#define DUK_HTHREAD_STRING_INT_BYTECODE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_BYTECODE) +#define DUK_STRIDX_INT_FORMALS 98 /* '\x82Formals' */ +#define DUK_HEAP_STRING_INT_FORMALS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_FORMALS) +#define DUK_HTHREAD_STRING_INT_FORMALS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_FORMALS) +#define DUK_STRIDX_INT_VARMAP 99 /* '\x82Varmap' */ +#define DUK_HEAP_STRING_INT_VARMAP(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_VARMAP) +#define DUK_HTHREAD_STRING_INT_VARMAP(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_VARMAP) +#define DUK_STRIDX_INT_SOURCE 100 /* '\x82Source' */ +#define DUK_HEAP_STRING_INT_SOURCE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_SOURCE) +#define DUK_HTHREAD_STRING_INT_SOURCE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_SOURCE) +#define DUK_STRIDX_INT_PC2LINE 101 /* '\x82Pc2line' */ +#define DUK_HEAP_STRING_INT_PC2LINE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_PC2LINE) +#define DUK_HTHREAD_STRING_INT_PC2LINE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_PC2LINE) +#define DUK_STRIDX_INT_MAP 102 /* '\x82Map' */ +#define DUK_HEAP_STRING_INT_MAP(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_MAP) +#define DUK_HTHREAD_STRING_INT_MAP(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_MAP) +#define DUK_STRIDX_INT_VARENV 103 /* '\x82Varenv' */ +#define DUK_HEAP_STRING_INT_VARENV(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_VARENV) +#define DUK_HTHREAD_STRING_INT_VARENV(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_VARENV) +#define DUK_STRIDX_INT_FINALIZER 104 /* '\x82Finalizer' */ +#define DUK_HEAP_STRING_INT_FINALIZER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_FINALIZER) +#define DUK_HTHREAD_STRING_INT_FINALIZER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_FINALIZER) +#define DUK_STRIDX_INT_VALUE 105 /* '\x82Value' */ +#define DUK_HEAP_STRING_INT_VALUE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INT_VALUE) +#define DUK_HTHREAD_STRING_INT_VALUE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INT_VALUE) +#define DUK_STRIDX_COMPILE 106 /* 'compile' */ +#define DUK_HEAP_STRING_COMPILE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_COMPILE) +#define DUK_HTHREAD_STRING_COMPILE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_COMPILE) +#define DUK_STRIDX_INPUT 107 /* 'input' */ +#define DUK_HEAP_STRING_INPUT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INPUT) +#define DUK_HTHREAD_STRING_INPUT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INPUT) +#define DUK_STRIDX_ERR_CREATE 108 /* 'errCreate' */ +#define DUK_HEAP_STRING_ERR_CREATE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ERR_CREATE) +#define DUK_HTHREAD_STRING_ERR_CREATE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ERR_CREATE) +#define DUK_STRIDX_ERR_THROW 109 /* 'errThrow' */ +#define DUK_HEAP_STRING_ERR_THROW(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ERR_THROW) +#define DUK_HTHREAD_STRING_ERR_THROW(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ERR_THROW) +#define DUK_STRIDX_ENV 110 /* 'env' */ +#define DUK_HEAP_STRING_ENV(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ENV) +#define DUK_HTHREAD_STRING_ENV(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ENV) +#define DUK_STRIDX_HEX 111 /* 'hex' */ +#define DUK_HEAP_STRING_HEX(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_HEX) +#define DUK_HTHREAD_STRING_HEX(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_HEX) +#define DUK_STRIDX_BASE64 112 /* 'base64' */ +#define DUK_HEAP_STRING_BASE64(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_BASE64) +#define DUK_HTHREAD_STRING_BASE64(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_BASE64) +#define DUK_STRIDX_JX 113 /* 'jx' */ +#define DUK_HEAP_STRING_JX(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JX) +#define DUK_HTHREAD_STRING_JX(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JX) +#define DUK_STRIDX_JC 114 /* 'jc' */ +#define DUK_HEAP_STRING_JC(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JC) +#define DUK_HTHREAD_STRING_JC(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JC) +#define DUK_STRIDX_JSON_EXT_UNDEFINED 115 /* '{"_undef":true}' */ +#define DUK_HEAP_STRING_JSON_EXT_UNDEFINED(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON_EXT_UNDEFINED) +#define DUK_HTHREAD_STRING_JSON_EXT_UNDEFINED(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON_EXT_UNDEFINED) +#define DUK_STRIDX_JSON_EXT_NAN 116 /* '{"_nan":true}' */ +#define DUK_HEAP_STRING_JSON_EXT_NAN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON_EXT_NAN) +#define DUK_HTHREAD_STRING_JSON_EXT_NAN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON_EXT_NAN) +#define DUK_STRIDX_JSON_EXT_POSINF 117 /* '{"_inf":true}' */ +#define DUK_HEAP_STRING_JSON_EXT_POSINF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON_EXT_POSINF) +#define DUK_HTHREAD_STRING_JSON_EXT_POSINF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON_EXT_POSINF) +#define DUK_STRIDX_JSON_EXT_NEGINF 118 /* '{"_ninf":true}' */ +#define DUK_HEAP_STRING_JSON_EXT_NEGINF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON_EXT_NEGINF) +#define DUK_HTHREAD_STRING_JSON_EXT_NEGINF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON_EXT_NEGINF) +#define DUK_STRIDX_JSON_EXT_FUNCTION1 119 /* '{"_func":true}' */ +#define DUK_HEAP_STRING_JSON_EXT_FUNCTION1(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON_EXT_FUNCTION1) +#define DUK_HTHREAD_STRING_JSON_EXT_FUNCTION1(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON_EXT_FUNCTION1) +#define DUK_STRIDX_JSON_EXT_FUNCTION2 120 /* '{_func:true}' */ +#define DUK_HEAP_STRING_JSON_EXT_FUNCTION2(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_JSON_EXT_FUNCTION2) +#define DUK_HTHREAD_STRING_JSON_EXT_FUNCTION2(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_JSON_EXT_FUNCTION2) +#define DUK_STRIDX_BREAK 121 /* 'break' */ +#define DUK_HEAP_STRING_BREAK(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_BREAK) +#define DUK_HTHREAD_STRING_BREAK(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_BREAK) +#define DUK_STRIDX_CASE 122 /* 'case' */ +#define DUK_HEAP_STRING_CASE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CASE) +#define DUK_HTHREAD_STRING_CASE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CASE) +#define DUK_STRIDX_CATCH 123 /* 'catch' */ +#define DUK_HEAP_STRING_CATCH(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CATCH) +#define DUK_HTHREAD_STRING_CATCH(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CATCH) +#define DUK_STRIDX_CONTINUE 124 /* 'continue' */ +#define DUK_HEAP_STRING_CONTINUE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CONTINUE) +#define DUK_HTHREAD_STRING_CONTINUE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CONTINUE) +#define DUK_STRIDX_DEBUGGER 125 /* 'debugger' */ +#define DUK_HEAP_STRING_DEBUGGER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DEBUGGER) +#define DUK_HTHREAD_STRING_DEBUGGER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DEBUGGER) +#define DUK_STRIDX_DEFAULT 126 /* 'default' */ +#define DUK_HEAP_STRING_DEFAULT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DEFAULT) +#define DUK_HTHREAD_STRING_DEFAULT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DEFAULT) +#define DUK_STRIDX_DELETE 127 /* 'delete' */ +#define DUK_HEAP_STRING_DELETE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DELETE) +#define DUK_HTHREAD_STRING_DELETE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DELETE) +#define DUK_STRIDX_DO 128 /* 'do' */ +#define DUK_HEAP_STRING_DO(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_DO) +#define DUK_HTHREAD_STRING_DO(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_DO) +#define DUK_STRIDX_ELSE 129 /* 'else' */ +#define DUK_HEAP_STRING_ELSE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ELSE) +#define DUK_HTHREAD_STRING_ELSE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ELSE) +#define DUK_STRIDX_FINALLY 130 /* 'finally' */ +#define DUK_HEAP_STRING_FINALLY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FINALLY) +#define DUK_HTHREAD_STRING_FINALLY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FINALLY) +#define DUK_STRIDX_FOR 131 /* 'for' */ +#define DUK_HEAP_STRING_FOR(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FOR) +#define DUK_HTHREAD_STRING_FOR(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FOR) +#define DUK_STRIDX_LC_FUNCTION 132 /* 'function' */ +#define DUK_HEAP_STRING_LC_FUNCTION(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_FUNCTION) +#define DUK_HTHREAD_STRING_LC_FUNCTION(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_FUNCTION) +#define DUK_STRIDX_IF 133 /* 'if' */ +#define DUK_HEAP_STRING_IF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_IF) +#define DUK_HTHREAD_STRING_IF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_IF) +#define DUK_STRIDX_IN 134 /* 'in' */ +#define DUK_HEAP_STRING_IN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_IN) +#define DUK_HTHREAD_STRING_IN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_IN) +#define DUK_STRIDX_INSTANCEOF 135 /* 'instanceof' */ +#define DUK_HEAP_STRING_INSTANCEOF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INSTANCEOF) +#define DUK_HTHREAD_STRING_INSTANCEOF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INSTANCEOF) +#define DUK_STRIDX_NEW 136 /* 'new' */ +#define DUK_HEAP_STRING_NEW(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_NEW) +#define DUK_HTHREAD_STRING_NEW(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_NEW) +#define DUK_STRIDX_RETURN 137 /* 'return' */ +#define DUK_HEAP_STRING_RETURN(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_RETURN) +#define DUK_HTHREAD_STRING_RETURN(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_RETURN) +#define DUK_STRIDX_SWITCH 138 /* 'switch' */ +#define DUK_HEAP_STRING_SWITCH(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_SWITCH) +#define DUK_HTHREAD_STRING_SWITCH(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_SWITCH) +#define DUK_STRIDX_THIS 139 /* 'this' */ +#define DUK_HEAP_STRING_THIS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_THIS) +#define DUK_HTHREAD_STRING_THIS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_THIS) +#define DUK_STRIDX_THROW 140 /* 'throw' */ +#define DUK_HEAP_STRING_THROW(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_THROW) +#define DUK_HTHREAD_STRING_THROW(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_THROW) +#define DUK_STRIDX_TRY 141 /* 'try' */ +#define DUK_HEAP_STRING_TRY(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TRY) +#define DUK_HTHREAD_STRING_TRY(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TRY) +#define DUK_STRIDX_TYPEOF 142 /* 'typeof' */ +#define DUK_HEAP_STRING_TYPEOF(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TYPEOF) +#define DUK_HTHREAD_STRING_TYPEOF(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TYPEOF) +#define DUK_STRIDX_VAR 143 /* 'var' */ +#define DUK_HEAP_STRING_VAR(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_VAR) +#define DUK_HTHREAD_STRING_VAR(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_VAR) +#define DUK_STRIDX_CONST 144 /* 'const' */ +#define DUK_HEAP_STRING_CONST(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CONST) +#define DUK_HTHREAD_STRING_CONST(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CONST) +#define DUK_STRIDX_VOID 145 /* 'void' */ +#define DUK_HEAP_STRING_VOID(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_VOID) +#define DUK_HTHREAD_STRING_VOID(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_VOID) +#define DUK_STRIDX_WHILE 146 /* 'while' */ +#define DUK_HEAP_STRING_WHILE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WHILE) +#define DUK_HTHREAD_STRING_WHILE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WHILE) +#define DUK_STRIDX_WITH 147 /* 'with' */ +#define DUK_HEAP_STRING_WITH(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_WITH) +#define DUK_HTHREAD_STRING_WITH(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_WITH) +#define DUK_STRIDX_CLASS 148 /* 'class' */ +#define DUK_HEAP_STRING_CLASS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_CLASS) +#define DUK_HTHREAD_STRING_CLASS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_CLASS) +#define DUK_STRIDX_ENUM 149 /* 'enum' */ +#define DUK_HEAP_STRING_ENUM(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_ENUM) +#define DUK_HTHREAD_STRING_ENUM(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_ENUM) +#define DUK_STRIDX_EXPORT 150 /* 'export' */ +#define DUK_HEAP_STRING_EXPORT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_EXPORT) +#define DUK_HTHREAD_STRING_EXPORT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_EXPORT) +#define DUK_STRIDX_EXTENDS 151 /* 'extends' */ +#define DUK_HEAP_STRING_EXTENDS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_EXTENDS) +#define DUK_HTHREAD_STRING_EXTENDS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_EXTENDS) +#define DUK_STRIDX_IMPORT 152 /* 'import' */ +#define DUK_HEAP_STRING_IMPORT(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_IMPORT) +#define DUK_HTHREAD_STRING_IMPORT(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_IMPORT) +#define DUK_STRIDX_SUPER 153 /* 'super' */ +#define DUK_HEAP_STRING_SUPER(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_SUPER) +#define DUK_HTHREAD_STRING_SUPER(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_SUPER) +#define DUK_STRIDX_LC_NULL 154 /* 'null' */ +#define DUK_HEAP_STRING_LC_NULL(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LC_NULL) +#define DUK_HTHREAD_STRING_LC_NULL(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LC_NULL) +#define DUK_STRIDX_TRUE 155 /* 'true' */ +#define DUK_HEAP_STRING_TRUE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_TRUE) +#define DUK_HTHREAD_STRING_TRUE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_TRUE) +#define DUK_STRIDX_FALSE 156 /* 'false' */ +#define DUK_HEAP_STRING_FALSE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_FALSE) +#define DUK_HTHREAD_STRING_FALSE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_FALSE) +#define DUK_STRIDX_IMPLEMENTS 157 /* 'implements' */ +#define DUK_HEAP_STRING_IMPLEMENTS(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_IMPLEMENTS) +#define DUK_HTHREAD_STRING_IMPLEMENTS(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_IMPLEMENTS) +#define DUK_STRIDX_INTERFACE 158 /* 'interface' */ +#define DUK_HEAP_STRING_INTERFACE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_INTERFACE) +#define DUK_HTHREAD_STRING_INTERFACE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_INTERFACE) +#define DUK_STRIDX_LET 159 /* 'let' */ +#define DUK_HEAP_STRING_LET(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_LET) +#define DUK_HTHREAD_STRING_LET(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_LET) +#define DUK_STRIDX_PACKAGE 160 /* 'package' */ +#define DUK_HEAP_STRING_PACKAGE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_PACKAGE) +#define DUK_HTHREAD_STRING_PACKAGE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_PACKAGE) +#define DUK_STRIDX_PRIVATE 161 /* 'private' */ +#define DUK_HEAP_STRING_PRIVATE(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_PRIVATE) +#define DUK_HTHREAD_STRING_PRIVATE(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_PRIVATE) +#define DUK_STRIDX_PROTECTED 162 /* 'protected' */ +#define DUK_HEAP_STRING_PROTECTED(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_PROTECTED) +#define DUK_HTHREAD_STRING_PROTECTED(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_PROTECTED) +#define DUK_STRIDX_PUBLIC 163 /* 'public' */ +#define DUK_HEAP_STRING_PUBLIC(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_PUBLIC) +#define DUK_HTHREAD_STRING_PUBLIC(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_PUBLIC) +#define DUK_STRIDX_STATIC 164 /* 'static' */ +#define DUK_HEAP_STRING_STATIC(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_STATIC) +#define DUK_HTHREAD_STRING_STATIC(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_STATIC) +#define DUK_STRIDX_YIELD 165 /* 'yield' */ +#define DUK_HEAP_STRING_YIELD(heap) DUK_HEAP_GET_STRING((heap),DUK_STRIDX_YIELD) +#define DUK_HTHREAD_STRING_YIELD(thr) DUK_HTHREAD_GET_STRING((thr),DUK_STRIDX_YIELD) + +#define DUK_HEAP_NUM_STRINGS 166 +#define DUK_STRIDX_START_RESERVED 121 +#define DUK_STRIDX_START_STRICT_RESERVED 157 +#define DUK_STRIDX_END_RESERVED 166 /* exclusive endpoint */ + +/* To convert a heap stridx to a token number, subtract + * DUK_STRIDX_START_RESERVED and add DUK_TOK_START_RESERVED. + */ +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_uint8_t duk_strings_data[967]; +#endif /* !DUK_SINGLE_FILE */ +#define DUK_STRDATA_MAX_STRLEN 27 +#define DUK_STRDATA_DATA_LENGTH 967 +#endif /* DUK_USE_ROM_STRINGS */ + +#if defined(DUK_USE_ROM_OBJECTS) +#error RAM support not enabled, rerun configure.py with --ram-support +#else /* DUK_USE_ROM_OBJECTS */ +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_prototype(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_boolean_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_regexp_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_constructor_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_type_error_thrower(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_parse_int(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_parse_float(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_thread_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_pointer_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_proxy_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_arraybuffer_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_dataview_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_typedarray_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_textencoder_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_textdecoder_constructor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_eval(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_is_nan(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_is_finite(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_decode_uri(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_decode_uri_component(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_encode_uri(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_encode_uri_component(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_escape(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_global_object_unescape(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_getprototype_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_setprototype_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_get_own_property_descriptor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_keys_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_assign(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_create(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_define_property(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_define_properties(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_seal_freeze_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_prevent_extensions(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_is_sealed_frozen_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_is_extensible(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_constructor_is(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_to_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_to_locale_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_value_of(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_has_own_property(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_is_prototype_of(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_property_is_enumerable(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_defineaccessor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_lookupaccessor(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_prototype_to_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_prototype_apply(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_prototype_call(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_prototype_bind(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_native_function_length(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_native_function_name(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_constructor_is_array(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_to_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_join_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_concat(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_pop(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_push(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_reverse(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_shift(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_slice(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_sort(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_splice(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_unshift(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_indexof_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_iter_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_array_prototype_reduce_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_constructor_from_char_code(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_constructor_from_code_point(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_to_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_char_at(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_char_code_at(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_concat(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_indexof_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_locale_compare(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_match(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_replace(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_search(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_slice(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_split(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_substring(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_caseconv_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_trim(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_repeat(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_startswith_endswith(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_includes(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_string_prototype_substr(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_boolean_prototype_tostring_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_check_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_prototype_to_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_prototype_to_locale_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_prototype_value_of(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_prototype_to_fixed(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_prototype_to_exponential(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_number_prototype_to_precision(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_constructor_parse(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_constructor_utc(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_constructor_now(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_tostring_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_to_json(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_value_of(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_get_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_get_timezone_offset(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_set_time(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_date_prototype_set_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_regexp_prototype_exec(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_regexp_prototype_test(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_regexp_prototype_tostring(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_regexp_prototype_flags(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_regexp_prototype_shared_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_stack_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_stack_setter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_filename_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_filename_setter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_linenumber_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_linenumber_setter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_error_prototype_to_string(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_onearg_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_twoarg_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_clz32(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_hypot(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_imul(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_max(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_min(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_random(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_math_object_sign(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_json_object_parse(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_json_object_stringify(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_info(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_act(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_gc(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_fin(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_enc(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_dec(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_duktape_object_compact(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_thread_yield(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_thread_resume(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_thread_current(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_pointer_prototype_tostring_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_reflect_apply(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_reflect_construct(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_reflect_object_delete_property(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_reflect_object_get(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_reflect_object_has(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_reflect_object_set(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_arraybuffer_isview(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_typedarray_bytelength_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_buffer_slice_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_typedarray_byteoffset_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_typedarray_buffer_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_buffer_readfield(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_buffer_writefield(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_typedarray_set(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_uint8array_allocplain(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_uint8array_plainof(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_concat(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_is_encoding(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_is_buffer(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_byte_length(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_buffer_compare_shared(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_tostring(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_tojson(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_fill(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_copy(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_nodejs_buffer_write(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_textencoder_prototype_encoding_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_textencoder_prototype_encode(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_textdecoder_prototype_shared_getter(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_textdecoder_prototype_decode(duk_context *ctx); +DUK_INTERNAL_DECL duk_ret_t duk_bi_performance_now(duk_context *ctx); +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_c_function duk_bi_native_functions[177]; +#endif /* !DUK_SINGLE_FILE */ +#define DUK_BIDX_GLOBAL 0 +#define DUK_BIDX_GLOBAL_ENV 1 +#define DUK_BIDX_OBJECT_CONSTRUCTOR 2 +#define DUK_BIDX_OBJECT_PROTOTYPE 3 +#define DUK_BIDX_FUNCTION_CONSTRUCTOR 4 +#define DUK_BIDX_FUNCTION_PROTOTYPE 5 +#define DUK_BIDX_NATIVE_FUNCTION_PROTOTYPE 6 +#define DUK_BIDX_ARRAY_CONSTRUCTOR 7 +#define DUK_BIDX_ARRAY_PROTOTYPE 8 +#define DUK_BIDX_STRING_CONSTRUCTOR 9 +#define DUK_BIDX_STRING_PROTOTYPE 10 +#define DUK_BIDX_BOOLEAN_CONSTRUCTOR 11 +#define DUK_BIDX_BOOLEAN_PROTOTYPE 12 +#define DUK_BIDX_NUMBER_CONSTRUCTOR 13 +#define DUK_BIDX_NUMBER_PROTOTYPE 14 +#define DUK_BIDX_DATE_CONSTRUCTOR 15 +#define DUK_BIDX_DATE_PROTOTYPE 16 +#define DUK_BIDX_REGEXP_CONSTRUCTOR 17 +#define DUK_BIDX_REGEXP_PROTOTYPE 18 +#define DUK_BIDX_ERROR_CONSTRUCTOR 19 +#define DUK_BIDX_ERROR_PROTOTYPE 20 +#define DUK_BIDX_EVAL_ERROR_CONSTRUCTOR 21 +#define DUK_BIDX_EVAL_ERROR_PROTOTYPE 22 +#define DUK_BIDX_RANGE_ERROR_CONSTRUCTOR 23 +#define DUK_BIDX_RANGE_ERROR_PROTOTYPE 24 +#define DUK_BIDX_REFERENCE_ERROR_CONSTRUCTOR 25 +#define DUK_BIDX_REFERENCE_ERROR_PROTOTYPE 26 +#define DUK_BIDX_SYNTAX_ERROR_CONSTRUCTOR 27 +#define DUK_BIDX_SYNTAX_ERROR_PROTOTYPE 28 +#define DUK_BIDX_TYPE_ERROR_CONSTRUCTOR 29 +#define DUK_BIDX_TYPE_ERROR_PROTOTYPE 30 +#define DUK_BIDX_URI_ERROR_CONSTRUCTOR 31 +#define DUK_BIDX_URI_ERROR_PROTOTYPE 32 +#define DUK_BIDX_TYPE_ERROR_THROWER 33 +#define DUK_BIDX_DUKTAPE 34 +#define DUK_BIDX_THREAD_PROTOTYPE 35 +#define DUK_BIDX_POINTER_PROTOTYPE 36 +#define DUK_BIDX_DOUBLE_ERROR 37 +#define DUK_BIDX_SYMBOL_PROTOTYPE 38 +#define DUK_BIDX_ARRAYBUFFER_PROTOTYPE 39 +#define DUK_BIDX_DATAVIEW_PROTOTYPE 40 +#define DUK_BIDX_INT8ARRAY_PROTOTYPE 41 +#define DUK_BIDX_UINT8ARRAY_PROTOTYPE 42 +#define DUK_BIDX_UINT8CLAMPEDARRAY_PROTOTYPE 43 +#define DUK_BIDX_INT16ARRAY_PROTOTYPE 44 +#define DUK_BIDX_UINT16ARRAY_PROTOTYPE 45 +#define DUK_BIDX_INT32ARRAY_PROTOTYPE 46 +#define DUK_BIDX_UINT32ARRAY_PROTOTYPE 47 +#define DUK_BIDX_FLOAT32ARRAY_PROTOTYPE 48 +#define DUK_BIDX_FLOAT64ARRAY_PROTOTYPE 49 +#define DUK_BIDX_NODEJS_BUFFER_PROTOTYPE 50 +#define DUK_NUM_BUILTINS 51 +#define DUK_NUM_BIDX_BUILTINS 51 +#define DUK_NUM_ALL_BUILTINS 78 +#if defined(DUK_USE_DOUBLE_LE) +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_uint8_t duk_builtins_data[4116]; +#endif /* !DUK_SINGLE_FILE */ +#define DUK_BUILTINS_DATA_LENGTH 4116 +#elif defined(DUK_USE_DOUBLE_BE) +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_uint8_t duk_builtins_data[4116]; +#endif /* !DUK_SINGLE_FILE */ +#define DUK_BUILTINS_DATA_LENGTH 4116 +#elif defined(DUK_USE_DOUBLE_ME) +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_uint8_t duk_builtins_data[4116]; +#endif /* !DUK_SINGLE_FILE */ +#define DUK_BUILTINS_DATA_LENGTH 4116 +#else +#error invalid endianness defines +#endif +#endif /* DUK_USE_ROM_OBJECTS */ +#endif /* DUK_BUILTINS_H_INCLUDED */ +#line 51 "duk_internal.h" + +/* #include duk_util.h */ +#line 1 "duk_util.h" +/* + * Utilities + */ + +#if !defined(DUK_UTIL_H_INCLUDED) +#define DUK_UTIL_H_INCLUDED + +#if defined(DUK_USE_GET_RANDOM_DOUBLE) +#define DUK_UTIL_GET_RANDOM_DOUBLE(thr) DUK_USE_GET_RANDOM_DOUBLE((thr)->heap_udata) +#else +#define DUK_UTIL_GET_RANDOM_DOUBLE(thr) duk_util_tinyrandom_get_double(thr) +#endif + +/* + * Some useful constants + */ + +#define DUK_DOUBLE_2TO32 4294967296.0 +#define DUK_DOUBLE_2TO31 2147483648.0 +#define DUK_DOUBLE_LOG2E 1.4426950408889634 +#define DUK_DOUBLE_LOG10E 0.4342944819032518 + +/* + * Endian conversion + */ + +#if defined(DUK_USE_INTEGER_LE) +#define DUK_HTON32(x) DUK_BSWAP32((x)) +#define DUK_NTOH32(x) DUK_BSWAP32((x)) +#define DUK_HTON16(x) DUK_BSWAP16((x)) +#define DUK_NTOH16(x) DUK_BSWAP16((x)) +#elif defined(DUK_USE_INTEGER_BE) +#define DUK_HTON32(x) (x) +#define DUK_NTOH32(x) (x) +#define DUK_HTON16(x) (x) +#define DUK_NTOH16(x) (x) +#else +#error internal error, endianness defines broken +#endif + +/* + * Bitstream decoder + */ + +struct duk_bitdecoder_ctx { + const duk_uint8_t *data; + duk_size_t offset; + duk_size_t length; + duk_uint32_t currval; + duk_small_int_t currbits; +}; + +#define DUK_BD_BITPACKED_STRING_MAXLEN 256 + +/* + * Bitstream encoder + */ + +struct duk_bitencoder_ctx { + duk_uint8_t *data; + duk_size_t offset; + duk_size_t length; + duk_uint32_t currval; + duk_small_int_t currbits; + duk_small_int_t truncated; +}; + +/* + * Raw write/read macros for big endian, unaligned basic values. + * Caller ensures there's enough space. The macros update the pointer + * argument automatically on resizes. The idiom seems a bit odd, but + * leads to compact code. + */ + +#define DUK_RAW_WRITE_U8(ptr,val) do { \ + *(ptr)++ = (duk_uint8_t) (val); \ + } while (0) +#define DUK_RAW_WRITE_U16_BE(ptr,val) duk_raw_write_u16_be(&(ptr), (duk_uint16_t) (val)) +#define DUK_RAW_WRITE_U32_BE(ptr,val) duk_raw_write_u32_be(&(ptr), (duk_uint32_t) (val)) +#define DUK_RAW_WRITE_DOUBLE_BE(ptr,val) duk_raw_write_double_be(&(ptr), (duk_double_t) (val)) +#define DUK_RAW_WRITE_XUTF8(ptr,val) do { \ + /* 'ptr' is evaluated both as LHS and RHS. */ \ + duk_uint8_t *duk__ptr; \ + duk_small_int_t duk__len; \ + duk__ptr = (duk_uint8_t *) (ptr); \ + duk__len = duk_unicode_encode_xutf8((duk_ucodepoint_t) (val), duk__ptr); \ + duk__ptr += duk__len; \ + (ptr) = duk__ptr; \ + } while (0) +#define DUK_RAW_WRITE_CESU8(ptr,val) do { \ + /* 'ptr' is evaluated both as LHS and RHS. */ \ + duk_uint8_t *duk__ptr; \ + duk_small_int_t duk__len; \ + duk__ptr = (duk_uint8_t *) (ptr); \ + duk__len = duk_unicode_encode_cesu8((duk_ucodepoint_t) (val), duk__ptr); \ + duk__ptr += duk__len; \ + (ptr) = duk__ptr; \ + } while (0) + +#define DUK_RAW_READ_U8(ptr) ((duk_uint8_t) (*(ptr)++)) +#define DUK_RAW_READ_U16_BE(ptr) duk_raw_read_u16_be(&(ptr)); +#define DUK_RAW_READ_U32_BE(ptr) duk_raw_read_u32_be(&(ptr)); +#define DUK_RAW_READ_DOUBLE_BE(ptr) duk_raw_read_double_be(&(ptr)); + +/* + * Buffer writer (dynamic buffer only) + * + * Helper for writing to a dynamic buffer with a concept of a "slack" area + * to reduce resizes. You can ensure there is enough space beforehand and + * then write for a while without further checks, relying on a stable data + * pointer. Slack handling is automatic so call sites only indicate how + * much data they need right now. + * + * There are several ways to write using bufwriter. The best approach + * depends mainly on how much performance matters over code footprint. + * The key issues are (1) ensuring there is space and (2) keeping the + * pointers consistent. Fast code should ensure space for multiple writes + * with one ensure call. Fastest inner loop code can temporarily borrow + * the 'p' pointer but must write it back eventually. + * + * Be careful to ensure all macro arguments (other than static pointers like + * 'thr' and 'bw_ctx') are evaluated exactly once, using temporaries if + * necessary (if that's not possible, there should be a note near the macro). + * Buffer write arguments often contain arithmetic etc so this is + * particularly important here. + */ + +/* XXX: Migrate bufwriter and other read/write helpers to its own header? */ + +struct duk_bufwriter_ctx { + duk_uint8_t *p; + duk_uint8_t *p_base; + duk_uint8_t *p_limit; + duk_hbuffer_dynamic *buf; +}; + +#if defined(DUK_USE_PREFER_SIZE) +#define DUK_BW_SLACK_ADD 64 +#define DUK_BW_SLACK_SHIFT 4 /* 2^4 -> 1/16 = 6.25% slack */ +#else +#define DUK_BW_SLACK_ADD 64 +#define DUK_BW_SLACK_SHIFT 2 /* 2^2 -> 1/4 = 25% slack */ +#endif + +/* Initialization and finalization (compaction), converting to other types. */ + +#define DUK_BW_INIT_PUSHBUF(thr,bw_ctx,sz) do { \ + duk_bw_init_pushbuf((thr), (bw_ctx), (sz)); \ + } while (0) +#define DUK_BW_INIT_WITHBUF(thr,bw_ctx,buf) do { \ + duk_bw_init((thr), (bw_ctx), (buf)); \ + } while (0) +#define DUK_BW_COMPACT(thr,bw_ctx) do { \ + /* Make underlying buffer compact to match DUK_BW_GET_SIZE(). */ \ + duk_bw_compact((thr), (bw_ctx)); \ + } while (0) +#define DUK_BW_PUSH_AS_STRING(thr,bw_ctx) do { \ + duk_push_lstring((thr), \ + (const char *) (bw_ctx)->p_base, \ + (duk_size_t) ((bw_ctx)->p - (bw_ctx)->p_base)); \ + } while (0) +/* Pointers may be NULL for a while when 'buf' size is zero and before any + * ENSURE calls have been made. Once an ENSURE has been made, the pointers + * are required to be non-NULL so that it's always valid to use memcpy() and + * memmove(), even for zero size. + */ +#define DUK_BW_ASSERT_VALID_EXPR(thr,bw_ctx) \ + DUK_ASSERT_EXPR((bw_ctx) != NULL && \ + (bw_ctx)->buf != NULL && \ + ((DUK_HBUFFER_DYNAMIC_GET_SIZE((bw_ctx)->buf) == 0) || \ + ((bw_ctx)->p != NULL && \ + (bw_ctx)->p_base != NULL && \ + (bw_ctx)->p_limit != NULL && \ + (bw_ctx)->p_limit >= (bw_ctx)->p_base && \ + (bw_ctx)->p >= (bw_ctx)->p_base && \ + (bw_ctx)->p <= (bw_ctx)->p_limit))) +#define DUK_BW_ASSERT_VALID(thr,bw_ctx) do { \ + DUK_BW_ASSERT_VALID_EXPR((thr), (bw_ctx)); \ + } while (0) + +/* Working with the pointer and current size. */ + +#define DUK_BW_GET_PTR(thr,bw_ctx) \ + ((bw_ctx)->p) +#define DUK_BW_SET_PTR(thr,bw_ctx,ptr) do { \ + (bw_ctx)->p = (ptr); \ + } while (0) +#define DUK_BW_ADD_PTR(thr,bw_ctx,delta) do { \ + (bw_ctx)->p += (delta); \ + } while (0) +#define DUK_BW_GET_BASEPTR(thr,bw_ctx) \ + ((bw_ctx)->p_base) +#define DUK_BW_GET_LIMITPTR(thr,bw_ctx) \ + ((bw_ctx)->p_limit) +#define DUK_BW_GET_SIZE(thr,bw_ctx) \ + ((duk_size_t) ((bw_ctx)->p - (bw_ctx)->p_base)) +#define DUK_BW_SET_SIZE(thr,bw_ctx,sz) do { \ + DUK_ASSERT((duk_size_t) (sz) <= (duk_size_t) ((bw_ctx)->p - (bw_ctx)->p_base)); \ + (bw_ctx)->p = (bw_ctx)->p_base + (sz); \ + } while (0) +#define DUK_BW_RESET_SIZE(thr,bw_ctx) do { \ + /* Reset to zero size, keep current limit. */ \ + (bw_ctx)->p = (bw_ctx)->p_base; \ + } while (0) +#define DUK_BW_GET_BUFFER(thr,bw_ctx) \ + ((bw_ctx)->buf) + +/* Ensuring (reserving) space. */ + +#define DUK_BW_ENSURE(thr,bw_ctx,sz) do { \ + duk_size_t duk__sz, duk__space; \ + DUK_BW_ASSERT_VALID((thr), (bw_ctx)); \ + duk__sz = (sz); \ + duk__space = (duk_size_t) ((bw_ctx)->p_limit - (bw_ctx)->p); \ + if (duk__space < duk__sz) { \ + (void) duk_bw_resize((thr), (bw_ctx), duk__sz); \ + } \ + } while (0) +/* NOTE: Multiple evaluation of 'ptr' in this macro. */ +/* XXX: Rework to use an always-inline function? */ +#define DUK_BW_ENSURE_RAW(thr,bw_ctx,sz,ptr) \ + (((duk_size_t) ((bw_ctx)->p_limit - (ptr)) >= (sz)) ? \ + (ptr) : \ + ((bw_ctx)->p = (ptr), duk_bw_resize((thr),(bw_ctx),(sz)))) +#define DUK_BW_ENSURE_GETPTR(thr,bw_ctx,sz) \ + DUK_BW_ENSURE_RAW((thr), (bw_ctx), (sz), (bw_ctx)->p) +#define DUK_BW_ASSERT_SPACE_EXPR(thr,bw_ctx,sz) \ + (DUK_BW_ASSERT_VALID_EXPR((thr), (bw_ctx)), \ + DUK_ASSERT_EXPR((duk_size_t) ((bw_ctx)->p_limit - (bw_ctx)->p) >= (duk_size_t) (sz))) +#define DUK_BW_ASSERT_SPACE(thr,bw_ctx,sz) do { \ + DUK_BW_ASSERT_SPACE_EXPR((thr), (bw_ctx), (sz)); \ + } while (0) + +/* Miscellaneous. */ + +#define DUK_BW_SETPTR_AND_COMPACT(thr,bw_ctx,ptr) do { \ + (bw_ctx)->p = (ptr); \ + duk_bw_compact((thr), (bw_ctx)); \ + } while (0) + +/* Fast write calls which assume you control the slack beforehand. + * Multibyte write variants exist and use a temporary write pointer + * because byte writes alias with anything: with a stored pointer + * explicit pointer load/stores get generated (e.g. gcc -Os). + */ + +#define DUK_BW_WRITE_RAW_U8(thr,bw_ctx,val) do { \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), 1); \ + *(bw_ctx)->p++ = (duk_uint8_t) (val); \ + } while (0) +#define DUK_BW_WRITE_RAW_U8_2(thr,bw_ctx,val1,val2) do { \ + duk_uint8_t *duk__p; \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), 2); \ + duk__p = (bw_ctx)->p; \ + *duk__p++ = (duk_uint8_t) (val1); \ + *duk__p++ = (duk_uint8_t) (val2); \ + (bw_ctx)->p = duk__p; \ + } while (0) +#define DUK_BW_WRITE_RAW_U8_3(thr,bw_ctx,val1,val2,val3) do { \ + duk_uint8_t *duk__p; \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), 3); \ + duk__p = (bw_ctx)->p; \ + *duk__p++ = (duk_uint8_t) (val1); \ + *duk__p++ = (duk_uint8_t) (val2); \ + *duk__p++ = (duk_uint8_t) (val3); \ + (bw_ctx)->p = duk__p; \ + } while (0) +#define DUK_BW_WRITE_RAW_U8_4(thr,bw_ctx,val1,val2,val3,val4) do { \ + duk_uint8_t *duk__p; \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), 4); \ + duk__p = (bw_ctx)->p; \ + *duk__p++ = (duk_uint8_t) (val1); \ + *duk__p++ = (duk_uint8_t) (val2); \ + *duk__p++ = (duk_uint8_t) (val3); \ + *duk__p++ = (duk_uint8_t) (val4); \ + (bw_ctx)->p = duk__p; \ + } while (0) +#define DUK_BW_WRITE_RAW_U8_5(thr,bw_ctx,val1,val2,val3,val4,val5) do { \ + duk_uint8_t *duk__p; \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), 5); \ + duk__p = (bw_ctx)->p; \ + *duk__p++ = (duk_uint8_t) (val1); \ + *duk__p++ = (duk_uint8_t) (val2); \ + *duk__p++ = (duk_uint8_t) (val3); \ + *duk__p++ = (duk_uint8_t) (val4); \ + *duk__p++ = (duk_uint8_t) (val5); \ + (bw_ctx)->p = duk__p; \ + } while (0) +#define DUK_BW_WRITE_RAW_U8_6(thr,bw_ctx,val1,val2,val3,val4,val5,val6) do { \ + duk_uint8_t *duk__p; \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), 6); \ + duk__p = (bw_ctx)->p; \ + *duk__p++ = (duk_uint8_t) (val1); \ + *duk__p++ = (duk_uint8_t) (val2); \ + *duk__p++ = (duk_uint8_t) (val3); \ + *duk__p++ = (duk_uint8_t) (val4); \ + *duk__p++ = (duk_uint8_t) (val5); \ + *duk__p++ = (duk_uint8_t) (val6); \ + (bw_ctx)->p = duk__p; \ + } while (0) +#define DUK_BW_WRITE_RAW_XUTF8(thr,bw_ctx,cp) do { \ + duk_ucodepoint_t duk__cp; \ + duk_small_int_t duk__enc_len; \ + duk__cp = (duk_ucodepoint_t) (cp); \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), duk_unicode_get_xutf8_length(duk__cp)); \ + duk__enc_len = duk_unicode_encode_xutf8(duk__cp, (bw_ctx)->p); \ + (bw_ctx)->p += duk__enc_len; \ + } while (0) +#define DUK_BW_WRITE_RAW_CESU8(thr,bw_ctx,cp) do { \ + duk_ucodepoint_t duk__cp; \ + duk_small_int_t duk__enc_len; \ + duk__cp = (duk_ucodepoint_t) (cp); \ + DUK_BW_ASSERT_SPACE((thr), (bw_ctx), duk_unicode_get_cesu8_length(duk__cp)); \ + duk__enc_len = duk_unicode_encode_cesu8(duk__cp, (bw_ctx)->p); \ + (bw_ctx)->p += duk__enc_len; \ + } while (0) +/* XXX: add temporary duk__p pointer here too; sharing */ +/* XXX: avoid unsafe variants */ +#define DUK_BW_WRITE_RAW_BYTES(thr,bw_ctx,valptr,valsz) do { \ + const void *duk__valptr; \ + duk_size_t duk__valsz; \ + duk__valptr = (const void *) (valptr); \ + duk__valsz = (duk_size_t) (valsz); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), duk__valptr, duk__valsz); \ + (bw_ctx)->p += duk__valsz; \ + } while (0) +#define DUK_BW_WRITE_RAW_CSTRING(thr,bw_ctx,val) do { \ + const duk_uint8_t *duk__val; \ + duk_size_t duk__val_len; \ + duk__val = (const duk_uint8_t *) (val); \ + duk__val_len = DUK_STRLEN((const char *) duk__val); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) duk__val, duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_RAW_HSTRING(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HSTRING_GET_BYTELEN((val)); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HSTRING_GET_DATA((val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_RAW_HBUFFER(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HBUFFER_GET_SIZE((val)); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HBUFFER_GET_DATA_PTR((thr)->heap, (val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_RAW_HBUFFER_FIXED(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HBUFFER_FIXED_GET_SIZE((val)); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HBUFFER_FIXED_GET_DATA_PTR((thr)->heap, (val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_RAW_HBUFFER_DYNAMIC(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HBUFFER_DYNAMIC_GET_SIZE((val)); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR((thr)->heap, (val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) + +/* Append bytes from a slice already in the buffer. */ +#define DUK_BW_WRITE_RAW_SLICE(thr,bw,dst_off,dst_len) \ + duk_bw_write_raw_slice((thr), (bw), (dst_off), (dst_len)) + +/* Insert bytes in the middle of the buffer from an external buffer. */ +#define DUK_BW_INSERT_RAW_BYTES(thr,bw,dst_off,buf,len) \ + duk_bw_insert_raw_bytes((thr), (bw), (dst_off), (buf), (len)) + +/* Insert bytes in the middle of the buffer from a slice already + * in the buffer. Source offset is interpreted "before" the operation. + */ +#define DUK_BW_INSERT_RAW_SLICE(thr,bw,dst_off,src_off,len) \ + duk_bw_insert_raw_slice((thr), (bw), (dst_off), (src_off), (len)) + +/* Insert a reserved area somewhere in the buffer; caller fills it. + * Evaluates to a (duk_uint_t *) pointing to the start of the reserved + * area for convenience. + */ +#define DUK_BW_INSERT_RAW_AREA(thr,bw,off,len) \ + duk_bw_insert_raw_area((thr), (bw), (off), (len)) + +/* Remove a slice from inside buffer. */ +#define DUK_BW_REMOVE_RAW_SLICE(thr,bw,off,len) \ + duk_bw_remove_raw_slice((thr), (bw), (off), (len)) + +/* Safe write calls which will ensure space first. */ + +#define DUK_BW_WRITE_ENSURE_U8(thr,bw_ctx,val) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), 1); \ + DUK_BW_WRITE_RAW_U8((thr), (bw_ctx), (val)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_U8_2(thr,bw_ctx,val1,val2) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), 2); \ + DUK_BW_WRITE_RAW_U8_2((thr), (bw_ctx), (val1), (val2)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_U8_3(thr,bw_ctx,val1,val2,val3) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), 3); \ + DUK_BW_WRITE_RAW_U8_3((thr), (bw_ctx), (val1), (val2), (val3)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_U8_4(thr,bw_ctx,val1,val2,val3,val4) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), 4); \ + DUK_BW_WRITE_RAW_U8_4((thr), (bw_ctx), (val1), (val2), (val3), (val4)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_U8_5(thr,bw_ctx,val1,val2,val3,val4,val5) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), 5); \ + DUK_BW_WRITE_RAW_U8_5((thr), (bw_ctx), (val1), (val2), (val3), (val4), (val5)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_U8_6(thr,bw_ctx,val1,val2,val3,val4,val5,val6) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), 6); \ + DUK_BW_WRITE_RAW_U8_6((thr), (bw_ctx), (val1), (val2), (val3), (val4), (val5), (val6)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_XUTF8(thr,bw_ctx,cp) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), DUK_UNICODE_MAX_XUTF8_LENGTH); \ + DUK_BW_WRITE_RAW_XUTF8((thr), (bw_ctx), (cp)); \ + } while (0) +#define DUK_BW_WRITE_ENSURE_CESU8(thr,bw_ctx,cp) do { \ + DUK_BW_ENSURE((thr), (bw_ctx), DUK_UNICODE_MAX_CESU8_LENGTH); \ + DUK_BW_WRITE_RAW_CESU8((thr), (bw_ctx), (cp)); \ + } while (0) +/* XXX: add temporary duk__p pointer here too; sharing */ +/* XXX: avoid unsafe */ +#define DUK_BW_WRITE_ENSURE_BYTES(thr,bw_ctx,valptr,valsz) do { \ + const void *duk__valptr; \ + duk_size_t duk__valsz; \ + duk__valptr = (const void *) (valptr); \ + duk__valsz = (duk_size_t) (valsz); \ + DUK_BW_ENSURE((thr), (bw_ctx), duk__valsz); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), duk__valptr, duk__valsz); \ + (bw_ctx)->p += duk__valsz; \ + } while (0) +#define DUK_BW_WRITE_ENSURE_CSTRING(thr,bw_ctx,val) do { \ + const duk_uint8_t *duk__val; \ + duk_size_t duk__val_len; \ + duk__val = (const duk_uint8_t *) (val); \ + duk__val_len = DUK_STRLEN((const char *) duk__val); \ + DUK_BW_ENSURE((thr), (bw_ctx), duk__val_len); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) duk__val, duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_ENSURE_HSTRING(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HSTRING_GET_BYTELEN((val)); \ + DUK_BW_ENSURE((thr), (bw_ctx), duk__val_len); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HSTRING_GET_DATA((val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_ENSURE_HBUFFER(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HBUFFER_GET_SIZE((val)); \ + DUK_BW_ENSURE((thr), (bw_ctx), duk__val_len); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HBUFFER_GET_DATA_PTR((thr)->heap, (val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_ENSURE_HBUFFER_FIXED(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HBUFFER_FIXED_GET_SIZE((val)); \ + DUK_BW_ENSURE((thr), (bw_ctx), duk__val_len); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HBUFFER_FIXED_GET_DATA_PTR((thr)->heap, (val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) +#define DUK_BW_WRITE_ENSURE_HBUFFER_DYNAMIC(thr,bw_ctx,val) do { \ + duk_size_t duk__val_len; \ + duk__val_len = DUK_HBUFFER_DYNAMIC_GET_SIZE((val)); \ + DUK_BW_ENSURE((thr), (bw_ctx), duk__val_len); \ + duk_memcpy_unsafe((void *) ((bw_ctx)->p), (const void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR((thr)->heap, (val)), duk__val_len); \ + (bw_ctx)->p += duk__val_len; \ + } while (0) + +#define DUK_BW_WRITE_ENSURE_SLICE(thr,bw,dst_off,dst_len) \ + duk_bw_write_ensure_slice((thr), (bw), (dst_off), (dst_len)) +#define DUK_BW_INSERT_ENSURE_BYTES(thr,bw,dst_off,buf,len) \ + duk_bw_insert_ensure_bytes((thr), (bw), (dst_off), (buf), (len)) +#define DUK_BW_INSERT_ENSURE_SLICE(thr,bw,dst_off,src_off,len) \ + duk_bw_insert_ensure_slice((thr), (bw), (dst_off), (src_off), (len)) +#define DUK_BW_INSERT_ENSURE_AREA(thr,bw,off,len) \ + /* Evaluates to (duk_uint8_t *) pointing to start of area. */ \ + duk_bw_insert_ensure_area((thr), (bw), (off), (len)) +#define DUK_BW_REMOVE_ENSURE_SLICE(thr,bw,off,len) \ + /* No difference between raw/ensure because the buffer shrinks. */ \ + DUK_BW_REMOVE_RAW_SLICE((thr), (bw), (off), (len)) + +/* + * Externs and prototypes + */ + +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_uint8_t duk_lc_digits[36]; +DUK_INTERNAL_DECL const duk_uint8_t duk_uc_nybbles[16]; +DUK_INTERNAL_DECL const duk_int8_t duk_hex_dectab[256]; +#if defined(DUK_USE_HEX_FASTPATH) +DUK_INTERNAL_DECL const duk_int16_t duk_hex_dectab_shift4[256]; +DUK_INTERNAL_DECL const duk_uint16_t duk_hex_enctab[256]; +#endif +#endif /* !DUK_SINGLE_FILE */ + +/* Note: assumes that duk_util_probe_steps size is 32 */ +#if defined(DUK_USE_HOBJECT_HASH_PART) +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL duk_uint8_t duk_util_probe_steps[32]; +#endif /* !DUK_SINGLE_FILE */ +#endif + +#if defined(DUK_USE_STRHASH_DENSE) +DUK_INTERNAL_DECL duk_uint32_t duk_util_hashbytes(const duk_uint8_t *data, duk_size_t len, duk_uint32_t seed); +#endif + +DUK_INTERNAL_DECL duk_uint32_t duk_bd_decode(duk_bitdecoder_ctx *ctx, duk_small_int_t bits); +DUK_INTERNAL_DECL duk_small_uint_t duk_bd_decode_flag(duk_bitdecoder_ctx *ctx); +DUK_INTERNAL_DECL duk_uint32_t duk_bd_decode_flagged(duk_bitdecoder_ctx *ctx, duk_small_int_t bits, duk_uint32_t def_value); +DUK_INTERNAL_DECL duk_int32_t duk_bd_decode_flagged_signed(duk_bitdecoder_ctx *ctx, duk_small_int_t bits, duk_int32_t def_value); +DUK_INTERNAL_DECL duk_uint32_t duk_bd_decode_varuint(duk_bitdecoder_ctx *ctx); +DUK_INTERNAL_DECL duk_small_uint_t duk_bd_decode_bitpacked_string(duk_bitdecoder_ctx *bd, duk_uint8_t *out); + +DUK_INTERNAL_DECL void duk_be_encode(duk_bitencoder_ctx *ctx, duk_uint32_t data, duk_small_int_t bits); +DUK_INTERNAL_DECL void duk_be_finish(duk_bitencoder_ctx *ctx); + +#if !defined(DUK_USE_GET_RANDOM_DOUBLE) +DUK_INTERNAL_DECL duk_double_t duk_util_tinyrandom_get_double(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_util_tinyrandom_prepare_seed(duk_hthread *thr); +#endif + +DUK_INTERNAL_DECL void duk_bw_init(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_hbuffer_dynamic *h_buf); +DUK_INTERNAL_DECL void duk_bw_init_pushbuf(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_size_t buf_size); +DUK_INTERNAL_DECL duk_uint8_t *duk_bw_resize(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_size_t sz); +DUK_INTERNAL_DECL void duk_bw_compact(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx); +DUK_INTERNAL_DECL void duk_bw_write_raw_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t src_off, duk_size_t len); +DUK_INTERNAL_DECL void duk_bw_write_ensure_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t src_off, duk_size_t len); +DUK_INTERNAL_DECL void duk_bw_insert_raw_bytes(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, const duk_uint8_t *buf, duk_size_t len); +DUK_INTERNAL_DECL void duk_bw_insert_ensure_bytes(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, const duk_uint8_t *buf, duk_size_t len); +DUK_INTERNAL_DECL void duk_bw_insert_raw_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, duk_size_t src_off, duk_size_t len); +DUK_INTERNAL_DECL void duk_bw_insert_ensure_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, duk_size_t src_off, duk_size_t len); +DUK_INTERNAL_DECL duk_uint8_t *duk_bw_insert_raw_area(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t off, duk_size_t len); +DUK_INTERNAL_DECL duk_uint8_t *duk_bw_insert_ensure_area(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t off, duk_size_t len); +DUK_INTERNAL_DECL void duk_bw_remove_raw_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t off, duk_size_t len); +/* No duk_bw_remove_ensure_slice(), functionality would be identical. */ + +DUK_INTERNAL_DECL duk_uint16_t duk_raw_read_u16_be(duk_uint8_t **p); +DUK_INTERNAL_DECL duk_uint32_t duk_raw_read_u32_be(duk_uint8_t **p); +DUK_INTERNAL_DECL duk_double_t duk_raw_read_double_be(duk_uint8_t **p); +DUK_INTERNAL_DECL void duk_raw_write_u16_be(duk_uint8_t **p, duk_uint16_t val); +DUK_INTERNAL_DECL void duk_raw_write_u32_be(duk_uint8_t **p, duk_uint32_t val); +DUK_INTERNAL_DECL void duk_raw_write_double_be(duk_uint8_t **p, duk_double_t val); + +#if defined(DUK_USE_DEBUGGER_SUPPORT) /* For now only needed by the debugger. */ +DUK_INTERNAL_DECL void duk_byteswap_bytes(duk_uint8_t *p, duk_small_uint_t len); +#endif + +/* memcpy(), memmove() etc wrappers. The plain variants like duk_memcpy() + * assume C99+ and 'src' and 'dst' pointers must be non-NULL even when the + * operation size is zero. The unsafe variants like duk_memcpy_safe() deal + * with the zero size case explicitly, and allow NULL pointers in that case + * (which is undefined behavior in C99+). For the majority of actual targets + * a NULL pointer with a zero length is fine in practice. These wrappers are + * macros to force inlining; because there are hundreds of call sites, even a + * few extra bytes per call site adds up to ~1kB footprint. + */ +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) +#define duk_memcpy(dst,src,len) do { \ + void *duk__dst = (dst); \ + const void *duk__src = (src); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + DUK_ASSERT(duk__src != NULL || duk__len == 0U); \ + (void) DUK_MEMCPY(duk__dst, duk__src, (size_t) duk__len); \ + } while (0) +#define duk_memcpy_unsafe(dst,src,len) duk_memcpy((dst), (src), (len)) +#define duk_memmove(dst,src,len) do { \ + void *duk__dst = (dst); \ + const void *duk__src = (src); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + DUK_ASSERT(duk__src != NULL || duk__len == 0U); \ + (void) DUK_MEMMOVE(duk__dst, duk__src, (size_t) duk__len); \ + } while (0) +#define duk_memmove_unsafe(dst,src,len) duk_memmove((dst), (src), (len)) +#define duk_memset(dst,val,len) do { \ + void *duk__dst = (dst); \ + duk_small_int_t duk__val = (val); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + (void) DUK_MEMSET(duk__dst, duk__val, (size_t) duk__len); \ + } while (0) +#define duk_memset_unsafe(dst,val,len) duk_memset((dst), (val), (len)) +#define duk_memzero(dst,len) do { \ + void *duk__dst = (dst); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + (void) DUK_MEMZERO(duk__dst, (size_t) duk__len); \ + } while (0) +#define duk_memzero_unsafe(dst,len) duk_memzero((dst), (len)) +#else /* DUK_USE_ALLOW_UNDEFINED_BEHAVIOR */ +#define duk_memcpy(dst,src,len) do { \ + void *duk__dst = (dst); \ + const void *duk__src = (src); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL); \ + DUK_ASSERT(duk__src != NULL); \ + (void) DUK_MEMCPY(duk__dst, duk__src, (size_t) duk__len); \ + } while (0) +#define duk_memcpy_unsafe(dst,src,len) do { \ + void *duk__dst = (dst); \ + const void *duk__src = (src); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + DUK_ASSERT(duk__src != NULL || duk__len == 0U); \ + if (DUK_LIKELY(duk__len > 0U)) { \ + DUK_ASSERT(duk__dst != NULL); \ + DUK_ASSERT(duk__src != NULL); \ + (void) DUK_MEMCPY(duk__dst, duk__src, (size_t) duk__len); \ + } \ + } while (0) +#define duk_memmove(dst,src,len) do { \ + void *duk__dst = (dst); \ + const void *duk__src = (src); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL); \ + DUK_ASSERT(duk__src != NULL); \ + (void) DUK_MEMMOVE(duk__dst, duk__src, (size_t) duk__len); \ + } while (0) +#define duk_memmove_unsafe(dst,src,len) do { \ + void *duk__dst = (dst); \ + const void *duk__src = (src); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + DUK_ASSERT(duk__src != NULL || duk__len == 0U); \ + if (DUK_LIKELY(duk__len > 0U)) { \ + DUK_ASSERT(duk__dst != NULL); \ + DUK_ASSERT(duk__src != NULL); \ + (void) DUK_MEMMOVE(duk__dst, duk__src, (size_t) duk__len); \ + } \ + } while (0) +#define duk_memset(dst,val,len) do { \ + void *duk__dst = (dst); \ + duk_small_int_t duk__val = (val); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL); \ + (void) DUK_MEMSET(duk__dst, duk__val, (size_t) duk__len); \ + } while (0) +#define duk_memset_unsafe(dst,val,len) do { \ + void *duk__dst = (dst); \ + duk_small_int_t duk__val = (val); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + if (DUK_LIKELY(duk__len > 0U)) { \ + DUK_ASSERT(duk__dst != NULL); \ + (void) DUK_MEMSET(duk__dst, duk__val, (size_t) duk__len); \ + } \ + } while (0) +#define duk_memzero(dst,len) do { \ + void *duk__dst = (dst); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL); \ + (void) DUK_MEMZERO(duk__dst, (size_t) duk__len); \ + } while (0) +#define duk_memzero_unsafe(dst,len) do { \ + void *duk__dst = (dst); \ + duk_size_t duk__len = (len); \ + DUK_ASSERT(duk__dst != NULL || duk__len == 0U); \ + if (DUK_LIKELY(duk__len > 0U)) { \ + DUK_ASSERT(duk__dst != NULL); \ + (void) DUK_MEMZERO(duk__dst, (size_t) duk__len); \ + } \ + } while (0) +#endif /* DUK_USE_ALLOW_UNDEFINED_BEHAVIOR */ + +DUK_INTERNAL_DECL duk_small_int_t duk_memcmp(const void *s1, const void *s2, duk_size_t len); +DUK_INTERNAL_DECL duk_small_int_t duk_memcmp_unsafe(const void *s1, const void *s2, duk_size_t len); + +DUK_INTERNAL_DECL duk_bool_t duk_is_whole_get_int32_nonegzero(duk_double_t x, duk_int32_t *ival); +DUK_INTERNAL_DECL duk_bool_t duk_is_whole_get_int32(duk_double_t x, duk_int32_t *ival); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_anyinf(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_posinf(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_neginf(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_nan(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_nan_or_zero(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_nan_or_inf(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_nan_zero_inf(duk_double_t x); +DUK_INTERNAL_DECL duk_small_uint_t duk_double_signbit(duk_double_t x); +DUK_INTERNAL_DECL duk_double_t duk_double_trunc_towards_zero(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_same_sign(duk_double_t x, duk_double_t y); +DUK_INTERNAL_DECL duk_double_t duk_double_fmin(duk_double_t x, duk_double_t y); +DUK_INTERNAL_DECL duk_double_t duk_double_fmax(duk_double_t x, duk_double_t y); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_finite(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_integer(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_double_is_safe_integer(duk_double_t x); + +DUK_INTERNAL_DECL duk_double_t duk_double_div(duk_double_t x, duk_double_t y); +DUK_INTERNAL_DECL duk_int_t duk_double_to_int_t(duk_double_t x); +DUK_INTERNAL_DECL duk_uint_t duk_double_to_uint_t(duk_double_t x); +DUK_INTERNAL_DECL duk_int32_t duk_double_to_int32_t(duk_double_t x); +DUK_INTERNAL_DECL duk_uint32_t duk_double_to_uint32_t(duk_double_t x); +DUK_INTERNAL_DECL duk_float_t duk_double_to_float_t(duk_double_t x); + +/* + * Miscellaneous + */ + +/* Example: x = 0x10 = 0b00010000 + * x - 1 = 0x0f = 0b00001111 + * x & (x - 1) == 0 + * + * x = 0x07 = 0b00000111 + * x - 1 = 0x06 = 0b00000110 + * x & (x - 1) != 0 + * + * However, incorrectly true for x == 0 so check for that explicitly. + */ +#define DUK_IS_POWER_OF_TWO(x) \ + ((x) != 0U && ((x) & ((x) - 1U)) == 0U) + +#endif /* DUK_UTIL_H_INCLUDED */ +/* #include duk_strings.h */ +#line 1 "duk_strings.h" +/* + * Shared string macros. + * + * Using shared macros helps minimize strings data size because it's easy + * to check if an existing string could be used. String constants don't + * need to be all defined here; defining a string here makes sense if there's + * a high chance the string could be reused. Also, using macros allows + * a call site express the exact string needed, but the macro may map to an + * approximate string to reduce unique string count. Macros can also be + * more easily tuned for low memory targets than #if defined()s throughout + * the code base. + * + * Because format strings behave differently in the call site (they need to + * be followed by format arguments), they use a special prefix DUK_STR_FMT_. + * + * On some compilers using explicit shared strings is preferable; on others + * it may be better to use straight literals because the compiler will combine + * them anyway, and such strings won't end up unnecessarily in a symbol table. + */ + +#if !defined(DUK_ERRMSG_H_INCLUDED) +#define DUK_ERRMSG_H_INCLUDED + +/* Mostly API and built-in method related */ +#define DUK_STR_INTERNAL_ERROR "internal error" +#define DUK_STR_UNSUPPORTED "unsupported" +#define DUK_STR_INVALID_COUNT "invalid count" +#define DUK_STR_INVALID_ARGS "invalid args" +#define DUK_STR_INVALID_STATE "invalid state" +#define DUK_STR_INVALID_INPUT "invalid input" +#define DUK_STR_INVALID_LENGTH "invalid length" +#define DUK_STR_NOT_CONSTRUCTABLE "not constructable" +#define DUK_STR_CONSTRUCT_ONLY "constructor requires 'new'" +#define DUK_STR_NOT_CALLABLE "not callable" +#define DUK_STR_NOT_EXTENSIBLE "not extensible" +#define DUK_STR_NOT_WRITABLE "not writable" +#define DUK_STR_NOT_CONFIGURABLE "not configurable" +#define DUK_STR_INVALID_CONTEXT "invalid context" +#define DUK_STR_INVALID_INDEX "invalid args" +#define DUK_STR_PUSH_BEYOND_ALLOC_STACK "cannot push beyond allocated stack" +#define DUK_STR_NOT_UNDEFINED "unexpected type" +#define DUK_STR_NOT_NULL "unexpected type" +#define DUK_STR_NOT_BOOLEAN "unexpected type" +#define DUK_STR_NOT_NUMBER "unexpected type" +#define DUK_STR_NOT_STRING "unexpected type" +#define DUK_STR_NOT_OBJECT "unexpected type" +#define DUK_STR_NOT_POINTER "unexpected type" +#define DUK_STR_NOT_BUFFER "not buffer" /* still in use with verbose messages */ +#define DUK_STR_UNEXPECTED_TYPE "unexpected type" +#define DUK_STR_NOT_THREAD "unexpected type" +#define DUK_STR_NOT_COMPFUNC "unexpected type" +#define DUK_STR_NOT_NATFUNC "unexpected type" +#define DUK_STR_NOT_C_FUNCTION "unexpected type" +#define DUK_STR_NOT_FUNCTION "unexpected type" +#define DUK_STR_NOT_REGEXP "unexpected type" +#define DUK_STR_TOPRIMITIVE_FAILED "coercion to primitive failed" +#define DUK_STR_NUMBER_OUTSIDE_RANGE "number outside range" +#define DUK_STR_NOT_OBJECT_COERCIBLE "not object coercible" +#define DUK_STR_CANNOT_NUMBER_COERCE_SYMBOL "cannot number coerce Symbol" +#define DUK_STR_CANNOT_STRING_COERCE_SYMBOL "cannot string coerce Symbol" +#define DUK_STR_STRING_TOO_LONG "string too long" +#define DUK_STR_BUFFER_TOO_LONG "buffer too long" +#define DUK_STR_ALLOC_FAILED "alloc failed" +#define DUK_STR_WRONG_BUFFER_TYPE "wrong buffer type" +#define DUK_STR_BASE64_ENCODE_FAILED "base64 encode failed" +#define DUK_STR_SOURCE_DECODE_FAILED "source decode failed" +#define DUK_STR_UTF8_DECODE_FAILED "utf-8 decode failed" +#define DUK_STR_BASE64_DECODE_FAILED "base64 decode failed" +#define DUK_STR_HEX_DECODE_FAILED "hex decode failed" +#define DUK_STR_INVALID_BYTECODE "invalid bytecode" +#define DUK_STR_NO_SOURCECODE "no sourcecode" +#define DUK_STR_RESULT_TOO_LONG "result too long" +#define DUK_STR_INVALID_CFUNC_RC "invalid C function rc" +#define DUK_STR_INVALID_INSTANCEOF_RVAL "invalid instanceof rval" +#define DUK_STR_INVALID_INSTANCEOF_RVAL_NOPROTO "instanceof rval has no .prototype" + +/* JSON */ +#define DUK_STR_FMT_PTR "%p" +#define DUK_STR_FMT_INVALID_JSON "invalid json (at offset %ld)" +#define DUK_STR_JSONDEC_RECLIMIT "json decode recursion limit" +#define DUK_STR_JSONENC_RECLIMIT "json encode recursion limit" +#define DUK_STR_CYCLIC_INPUT "cyclic input" + +/* Object property access */ +#define DUK_STR_INVALID_BASE "invalid base value" +#define DUK_STR_STRICT_CALLER_READ "cannot read strict 'caller'" +#define DUK_STR_PROXY_REJECTED "proxy rejected" +#define DUK_STR_INVALID_ARRAY_LENGTH "invalid array length" +#define DUK_STR_SETTER_UNDEFINED "setter undefined" +#define DUK_STR_INVALID_DESCRIPTOR "invalid descriptor" + +/* Proxy */ +#define DUK_STR_PROXY_REVOKED "proxy revoked" +#define DUK_STR_INVALID_TRAP_RESULT "invalid trap result" + +/* Variables */ + +/* Lexer */ +#define DUK_STR_INVALID_ESCAPE "invalid escape" +#define DUK_STR_UNTERMINATED_STRING "unterminated string" +#define DUK_STR_UNTERMINATED_COMMENT "unterminated comment" +#define DUK_STR_UNTERMINATED_REGEXP "unterminated regexp" +#define DUK_STR_TOKEN_LIMIT "token limit" +#define DUK_STR_REGEXP_SUPPORT_DISABLED "regexp support disabled" +#define DUK_STR_INVALID_NUMBER_LITERAL "invalid number literal" +#define DUK_STR_INVALID_TOKEN "invalid token" + +/* Compiler */ +#define DUK_STR_PARSE_ERROR "parse error" +#define DUK_STR_DUPLICATE_LABEL "duplicate label" +#define DUK_STR_INVALID_LABEL "invalid label" +#define DUK_STR_INVALID_ARRAY_LITERAL "invalid array literal" +#define DUK_STR_INVALID_OBJECT_LITERAL "invalid object literal" +#define DUK_STR_INVALID_VAR_DECLARATION "invalid variable declaration" +#define DUK_STR_CANNOT_DELETE_IDENTIFIER "cannot delete identifier" +#define DUK_STR_INVALID_EXPRESSION "invalid expression" +#define DUK_STR_INVALID_LVALUE "invalid lvalue" +#define DUK_STR_INVALID_NEWTARGET "invalid new.target" +#define DUK_STR_EXPECTED_IDENTIFIER "expected identifier" +#define DUK_STR_EMPTY_EXPR_NOT_ALLOWED "empty expression not allowed" +#define DUK_STR_INVALID_FOR "invalid for statement" +#define DUK_STR_INVALID_SWITCH "invalid switch statement" +#define DUK_STR_INVALID_BREAK_CONT_LABEL "invalid break/continue label" +#define DUK_STR_INVALID_RETURN "invalid return" +#define DUK_STR_INVALID_TRY "invalid try" +#define DUK_STR_INVALID_THROW "invalid throw" +#define DUK_STR_WITH_IN_STRICT_MODE "with in strict mode" +#define DUK_STR_FUNC_STMT_NOT_ALLOWED "function statement not allowed" +#define DUK_STR_UNTERMINATED_STMT "unterminated statement" +#define DUK_STR_INVALID_ARG_NAME "invalid argument name" +#define DUK_STR_INVALID_FUNC_NAME "invalid function name" +#define DUK_STR_INVALID_GETSET_NAME "invalid getter/setter name" +#define DUK_STR_FUNC_NAME_REQUIRED "function name required" + +/* RegExp */ +#define DUK_STR_INVALID_QUANTIFIER "invalid regexp quantifier" +#define DUK_STR_INVALID_QUANTIFIER_NO_ATOM "quantifier without preceding atom" +#define DUK_STR_INVALID_QUANTIFIER_VALUES "quantifier values invalid (qmin > qmax)" +#define DUK_STR_QUANTIFIER_TOO_MANY_COPIES "quantifier requires too many atom copies" +#define DUK_STR_UNEXPECTED_CLOSING_PAREN "unexpected closing parenthesis" +#define DUK_STR_UNEXPECTED_END_OF_PATTERN "unexpected end of pattern" +#define DUK_STR_UNEXPECTED_REGEXP_TOKEN "unexpected token in regexp" +#define DUK_STR_INVALID_REGEXP_FLAGS "invalid regexp flags" +#define DUK_STR_INVALID_REGEXP_ESCAPE "invalid regexp escape" +#define DUK_STR_INVALID_BACKREFS "invalid backreference(s)" +#define DUK_STR_INVALID_REGEXP_CHARACTER "invalid regexp character" +#define DUK_STR_INVALID_REGEXP_GROUP "invalid regexp group" +#define DUK_STR_UNTERMINATED_CHARCLASS "unterminated character class" +#define DUK_STR_INVALID_RANGE "invalid range" + +/* Limits */ +#define DUK_STR_VALSTACK_LIMIT "valstack limit" +#define DUK_STR_CALLSTACK_LIMIT "callstack limit" +#define DUK_STR_PROTOTYPE_CHAIN_LIMIT "prototype chain limit" +#define DUK_STR_BOUND_CHAIN_LIMIT "function call bound chain limit" +#define DUK_STR_C_CALLSTACK_LIMIT "C call stack depth limit" +#define DUK_STR_COMPILER_RECURSION_LIMIT "compiler recursion limit" +#define DUK_STR_BYTECODE_LIMIT "bytecode limit" +#define DUK_STR_REG_LIMIT "register limit" +#define DUK_STR_TEMP_LIMIT "temp limit" +#define DUK_STR_CONST_LIMIT "const limit" +#define DUK_STR_FUNC_LIMIT "function limit" +#define DUK_STR_REGEXP_COMPILER_RECURSION_LIMIT "regexp compiler recursion limit" +#define DUK_STR_REGEXP_EXECUTOR_RECURSION_LIMIT "regexp executor recursion limit" +#define DUK_STR_REGEXP_EXECUTOR_STEP_LIMIT "regexp step limit" + +#endif /* DUK_ERRMSG_H_INCLUDED */ +/* #include duk_js_bytecode.h */ +#line 1 "duk_js_bytecode.h" +/* + * ECMAScript bytecode + */ + +#if !defined(DUK_JS_BYTECODE_H_INCLUDED) +#define DUK_JS_BYTECODE_H_INCLUDED + +/* + * Bytecode instruction layout + * =========================== + * + * Instructions are unsigned 32-bit integers divided as follows: + * + * !3!3!2!2!2!2!2!2!2!2!2!2!1!1!1!1!1!1!1!1!1!1! ! ! ! ! ! ! ! ! ! ! + * !1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0! + * +-----------------------------------------------+---------------+ + * ! C ! B ! A ! OP ! + * +-----------------------------------------------+---------------+ + * + * OP (8 bits): opcode (DUK_OP_*), access should be fastest + * consecutive opcodes allocated when opcode needs flags + * A (8 bits): typically a target register number + * B (8 bits): typically first source register/constant number + * C (8 bits): typically second source register/constant number + * + * Some instructions combine BC or ABC together for larger parameter values. + * Signed integers (e.g. jump offsets) are encoded as unsigned, with an + * opcode specific bias. + * + * Some opcodes have flags which are handled by allocating consecutive + * opcodes to make space for 1-N flags. Flags can also be e.g. in the 'A' + * field when there's room for the specific opcode. + * + * For example, if three flags were needed, they could be allocated from + * the opcode field as follows: + * + * !3!3!2!2!2!2!2!2!2!2!2!2!1!1!1!1!1!1!1!1!1!1! ! ! ! ! ! ! ! ! ! ! + * !1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0! + * +-----------------------------------------------+---------------+ + * ! C ! B ! A ! OP !Z!Y!X! + * +-----------------------------------------------+---------------+ + * + * Some opcodes accept a reg/const argument which is handled by allocating + * flags in the OP field, see DUK_BC_ISREG() and DUK_BC_ISCONST(). The + * following convention is shared by most opcodes, so that the compiler + * can handle reg/const flagging without opcode specific code paths: + * + * !3!3!2!2!2!2!2!2!2!2!2!2!1!1!1!1!1!1!1!1!1!1! ! ! ! ! ! ! ! ! ! ! + * !1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0!9!8!7!6!5!4!3!2!1!0! + * +-----------------------------------------------+---------------+ + * ! C ! B ! A ! OP !Y!X! + * +-----------------------------------------------+---------------+ + * + * X 1=B is const, 0=B is reg + * Y 1=C is const, 0=C is reg + * + * In effect OP, OP + 1, OP + 2, and OP + 3 are allocated from the + * 8-bit opcode space for a single logical opcode. The base opcode + * number should be divisible by 4. If the opcode is called 'FOO' + * the following opcode constants would be defined: + * + * DUK_OP_FOO 100 // base opcode number + * DUK_OP_FOO_RR 100 // FOO, B=reg, C=reg + * DUK_OP_FOO_CR 101 // FOO, B=const, C=reg + * DUK_OP_FOO_RC 102 // FOO, B=reg, C=const + * DUK_OP_FOO_CC 103 // FOO, B=const, C=const + * + * If only B or C is a reg/const, the unused opcode combinations can be + * used for other opcodes (which take no reg/const argument). However, + * such opcode values are initially reserved, at least while opcode space + * is available. For example, if 'BAR' uses B for a register field and + * C is a reg/const: + * + * DUK_OP_BAR 116 // base opcode number + * DUK_OP_BAR_RR 116 // BAR, B=reg, C=reg + * DUK_OP_BAR_CR_UNUSED 117 // unused, could be repurposed + * DUK_OP_BAR_RC 118 // BAR, B=reg, C=const + * DUK_OP_BAR_CC_UNUSED 119 // unused, could be repurposed + * + * Macro naming is a bit misleading, e.g. "ABC" in macro name but the + * field layout is concretely "CBA" in the register. + */ + +typedef duk_uint32_t duk_instr_t; + +#define DUK_BC_SHIFT_OP 0 +#define DUK_BC_SHIFT_A 8 +#define DUK_BC_SHIFT_B 16 +#define DUK_BC_SHIFT_C 24 +#define DUK_BC_SHIFT_BC DUK_BC_SHIFT_B +#define DUK_BC_SHIFT_ABC DUK_BC_SHIFT_A + +#define DUK_BC_UNSHIFTED_MASK_OP 0xffUL +#define DUK_BC_UNSHIFTED_MASK_A 0xffUL +#define DUK_BC_UNSHIFTED_MASK_B 0xffUL +#define DUK_BC_UNSHIFTED_MASK_C 0xffUL +#define DUK_BC_UNSHIFTED_MASK_BC 0xffffUL +#define DUK_BC_UNSHIFTED_MASK_ABC 0xffffffUL + +#define DUK_BC_SHIFTED_MASK_OP (DUK_BC_UNSHIFTED_MASK_OP << DUK_BC_SHIFT_OP) +#define DUK_BC_SHIFTED_MASK_A (DUK_BC_UNSHIFTED_MASK_A << DUK_BC_SHIFT_A) +#define DUK_BC_SHIFTED_MASK_B (DUK_BC_UNSHIFTED_MASK_B << DUK_BC_SHIFT_B) +#define DUK_BC_SHIFTED_MASK_C (DUK_BC_UNSHIFTED_MASK_C << DUK_BC_SHIFT_C) +#define DUK_BC_SHIFTED_MASK_BC (DUK_BC_UNSHIFTED_MASK_BC << DUK_BC_SHIFT_BC) +#define DUK_BC_SHIFTED_MASK_ABC (DUK_BC_UNSHIFTED_MASK_ABC << DUK_BC_SHIFT_ABC) + +#define DUK_DEC_OP(x) ((x) & 0xffUL) +#define DUK_DEC_A(x) (((x) >> 8) & 0xffUL) +#define DUK_DEC_B(x) (((x) >> 16) & 0xffUL) +#define DUK_DEC_C(x) (((x) >> 24) & 0xffUL) +#define DUK_DEC_BC(x) (((x) >> 16) & 0xffffUL) +#define DUK_DEC_ABC(x) (((x) >> 8) & 0xffffffUL) + +#define DUK_ENC_OP(op) ((duk_instr_t) (op)) +#define DUK_ENC_OP_ABC(op,abc) ((duk_instr_t) ( \ + (((duk_instr_t) (abc)) << 8) | \ + ((duk_instr_t) (op)) \ + )) +#define DUK_ENC_OP_A_BC(op,a,bc) ((duk_instr_t) ( \ + (((duk_instr_t) (bc)) << 16) | \ + (((duk_instr_t) (a)) << 8) | \ + ((duk_instr_t) (op)) \ + )) +#define DUK_ENC_OP_A_B_C(op,a,b,c) ((duk_instr_t) ( \ + (((duk_instr_t) (c)) << 24) | \ + (((duk_instr_t) (b)) << 16) | \ + (((duk_instr_t) (a)) << 8) | \ + ((duk_instr_t) (op)) \ + )) +#define DUK_ENC_OP_A_B(op,a,b) DUK_ENC_OP_A_B_C((op),(a),(b),0) +#define DUK_ENC_OP_A(op,a) DUK_ENC_OP_A_B_C((op),(a),0,0) +#define DUK_ENC_OP_BC(op,bc) DUK_ENC_OP_A_BC((op),0,(bc)) + +/* Get opcode base value with B/C reg/const flags cleared. */ +#define DUK_BC_NOREGCONST_OP(op) ((op) & 0xfc) + +/* Constants should be signed so that signed arithmetic involving them + * won't cause values to be coerced accidentally to unsigned. + */ +#define DUK_BC_OP_MIN 0 +#define DUK_BC_OP_MAX 0xffL +#define DUK_BC_A_MIN 0 +#define DUK_BC_A_MAX 0xffL +#define DUK_BC_B_MIN 0 +#define DUK_BC_B_MAX 0xffL +#define DUK_BC_C_MIN 0 +#define DUK_BC_C_MAX 0xffL +#define DUK_BC_BC_MIN 0 +#define DUK_BC_BC_MAX 0xffffL +#define DUK_BC_ABC_MIN 0 +#define DUK_BC_ABC_MAX 0xffffffL + +/* Masks for B/C reg/const indicator in opcode field. */ +#define DUK_BC_REGCONST_B (0x01UL) +#define DUK_BC_REGCONST_C (0x02UL) + +/* Misc. masks for opcode field. */ +#define DUK_BC_INCDECP_FLAG_DEC (0x04UL) +#define DUK_BC_INCDECP_FLAG_POST (0x08UL) + +/* Opcodes. */ +#define DUK_OP_LDREG 0 +#define DUK_OP_STREG 1 +#define DUK_OP_JUMP 2 +#define DUK_OP_LDCONST 3 +#define DUK_OP_LDINT 4 +#define DUK_OP_LDINTX 5 +#define DUK_OP_LDTHIS 6 +#define DUK_OP_LDUNDEF 7 +#define DUK_OP_LDNULL 8 +#define DUK_OP_LDTRUE 9 +#define DUK_OP_LDFALSE 10 +#define DUK_OP_GETVAR 11 +#define DUK_OP_BNOT 12 +#define DUK_OP_LNOT 13 +#define DUK_OP_UNM 14 +#define DUK_OP_UNP 15 +#define DUK_OP_EQ 16 +#define DUK_OP_EQ_RR 16 +#define DUK_OP_EQ_CR 17 +#define DUK_OP_EQ_RC 18 +#define DUK_OP_EQ_CC 19 +#define DUK_OP_NEQ 20 +#define DUK_OP_NEQ_RR 20 +#define DUK_OP_NEQ_CR 21 +#define DUK_OP_NEQ_RC 22 +#define DUK_OP_NEQ_CC 23 +#define DUK_OP_SEQ 24 +#define DUK_OP_SEQ_RR 24 +#define DUK_OP_SEQ_CR 25 +#define DUK_OP_SEQ_RC 26 +#define DUK_OP_SEQ_CC 27 +#define DUK_OP_SNEQ 28 +#define DUK_OP_SNEQ_RR 28 +#define DUK_OP_SNEQ_CR 29 +#define DUK_OP_SNEQ_RC 30 +#define DUK_OP_SNEQ_CC 31 +#define DUK_OP_GT 32 +#define DUK_OP_GT_RR 32 +#define DUK_OP_GT_CR 33 +#define DUK_OP_GT_RC 34 +#define DUK_OP_GT_CC 35 +#define DUK_OP_GE 36 +#define DUK_OP_GE_RR 36 +#define DUK_OP_GE_CR 37 +#define DUK_OP_GE_RC 38 +#define DUK_OP_GE_CC 39 +#define DUK_OP_LT 40 +#define DUK_OP_LT_RR 40 +#define DUK_OP_LT_CR 41 +#define DUK_OP_LT_RC 42 +#define DUK_OP_LT_CC 43 +#define DUK_OP_LE 44 +#define DUK_OP_LE_RR 44 +#define DUK_OP_LE_CR 45 +#define DUK_OP_LE_RC 46 +#define DUK_OP_LE_CC 47 +#define DUK_OP_IFTRUE 48 +#define DUK_OP_IFTRUE_R 48 +#define DUK_OP_IFTRUE_C 49 +#define DUK_OP_IFFALSE 50 +#define DUK_OP_IFFALSE_R 50 +#define DUK_OP_IFFALSE_C 51 +#define DUK_OP_ADD 52 +#define DUK_OP_ADD_RR 52 +#define DUK_OP_ADD_CR 53 +#define DUK_OP_ADD_RC 54 +#define DUK_OP_ADD_CC 55 +#define DUK_OP_SUB 56 +#define DUK_OP_SUB_RR 56 +#define DUK_OP_SUB_CR 57 +#define DUK_OP_SUB_RC 58 +#define DUK_OP_SUB_CC 59 +#define DUK_OP_MUL 60 +#define DUK_OP_MUL_RR 60 +#define DUK_OP_MUL_CR 61 +#define DUK_OP_MUL_RC 62 +#define DUK_OP_MUL_CC 63 +#define DUK_OP_DIV 64 +#define DUK_OP_DIV_RR 64 +#define DUK_OP_DIV_CR 65 +#define DUK_OP_DIV_RC 66 +#define DUK_OP_DIV_CC 67 +#define DUK_OP_MOD 68 +#define DUK_OP_MOD_RR 68 +#define DUK_OP_MOD_CR 69 +#define DUK_OP_MOD_RC 70 +#define DUK_OP_MOD_CC 71 +#define DUK_OP_EXP 72 +#define DUK_OP_EXP_RR 72 +#define DUK_OP_EXP_CR 73 +#define DUK_OP_EXP_RC 74 +#define DUK_OP_EXP_CC 75 +#define DUK_OP_BAND 76 +#define DUK_OP_BAND_RR 76 +#define DUK_OP_BAND_CR 77 +#define DUK_OP_BAND_RC 78 +#define DUK_OP_BAND_CC 79 +#define DUK_OP_BOR 80 +#define DUK_OP_BOR_RR 80 +#define DUK_OP_BOR_CR 81 +#define DUK_OP_BOR_RC 82 +#define DUK_OP_BOR_CC 83 +#define DUK_OP_BXOR 84 +#define DUK_OP_BXOR_RR 84 +#define DUK_OP_BXOR_CR 85 +#define DUK_OP_BXOR_RC 86 +#define DUK_OP_BXOR_CC 87 +#define DUK_OP_BASL 88 +#define DUK_OP_BASL_RR 88 +#define DUK_OP_BASL_CR 89 +#define DUK_OP_BASL_RC 90 +#define DUK_OP_BASL_CC 91 +#define DUK_OP_BLSR 92 +#define DUK_OP_BLSR_RR 92 +#define DUK_OP_BLSR_CR 93 +#define DUK_OP_BLSR_RC 94 +#define DUK_OP_BLSR_CC 95 +#define DUK_OP_BASR 96 +#define DUK_OP_BASR_RR 96 +#define DUK_OP_BASR_CR 97 +#define DUK_OP_BASR_RC 98 +#define DUK_OP_BASR_CC 99 +#define DUK_OP_INSTOF 100 +#define DUK_OP_INSTOF_RR 100 +#define DUK_OP_INSTOF_CR 101 +#define DUK_OP_INSTOF_RC 102 +#define DUK_OP_INSTOF_CC 103 +#define DUK_OP_IN 104 +#define DUK_OP_IN_RR 104 +#define DUK_OP_IN_CR 105 +#define DUK_OP_IN_RC 106 +#define DUK_OP_IN_CC 107 +#define DUK_OP_GETPROP 108 +#define DUK_OP_GETPROP_RR 108 +#define DUK_OP_GETPROP_CR 109 +#define DUK_OP_GETPROP_RC 110 +#define DUK_OP_GETPROP_CC 111 +#define DUK_OP_PUTPROP 112 +#define DUK_OP_PUTPROP_RR 112 +#define DUK_OP_PUTPROP_CR 113 +#define DUK_OP_PUTPROP_RC 114 +#define DUK_OP_PUTPROP_CC 115 +#define DUK_OP_DELPROP 116 +#define DUK_OP_DELPROP_RR 116 +#define DUK_OP_DELPROP_CR_UNUSED 117 /* unused now */ +#define DUK_OP_DELPROP_RC 118 +#define DUK_OP_DELPROP_CC_UNUSED 119 /* unused now */ +#define DUK_OP_PREINCR 120 /* pre/post opcode values have constraints, */ +#define DUK_OP_PREDECR 121 /* see duk_js_executor.c and duk_js_compiler.c. */ +#define DUK_OP_POSTINCR 122 +#define DUK_OP_POSTDECR 123 +#define DUK_OP_PREINCV 124 +#define DUK_OP_PREDECV 125 +#define DUK_OP_POSTINCV 126 +#define DUK_OP_POSTDECV 127 +#define DUK_OP_PREINCP 128 /* pre/post inc/dec prop opcodes have constraints */ +#define DUK_OP_PREINCP_RR 128 +#define DUK_OP_PREINCP_CR 129 +#define DUK_OP_PREINCP_RC 130 +#define DUK_OP_PREINCP_CC 131 +#define DUK_OP_PREDECP 132 +#define DUK_OP_PREDECP_RR 132 +#define DUK_OP_PREDECP_CR 133 +#define DUK_OP_PREDECP_RC 134 +#define DUK_OP_PREDECP_CC 135 +#define DUK_OP_POSTINCP 136 +#define DUK_OP_POSTINCP_RR 136 +#define DUK_OP_POSTINCP_CR 137 +#define DUK_OP_POSTINCP_RC 138 +#define DUK_OP_POSTINCP_CC 139 +#define DUK_OP_POSTDECP 140 +#define DUK_OP_POSTDECP_RR 140 +#define DUK_OP_POSTDECP_CR 141 +#define DUK_OP_POSTDECP_RC 142 +#define DUK_OP_POSTDECP_CC 143 +#define DUK_OP_DECLVAR 144 +#define DUK_OP_DECLVAR_RR 144 +#define DUK_OP_DECLVAR_CR 145 +#define DUK_OP_DECLVAR_RC 146 +#define DUK_OP_DECLVAR_CC 147 +#define DUK_OP_REGEXP 148 +#define DUK_OP_REGEXP_RR 148 +#define DUK_OP_REGEXP_CR 149 +#define DUK_OP_REGEXP_RC 150 +#define DUK_OP_REGEXP_CC 151 +#define DUK_OP_CLOSURE 152 +#define DUK_OP_TYPEOF 153 +#define DUK_OP_TYPEOFID 154 +#define DUK_OP_PUTVAR 155 +#define DUK_OP_DELVAR 156 +#define DUK_OP_RETREG 157 +#define DUK_OP_RETUNDEF 158 +#define DUK_OP_RETCONST 159 +#define DUK_OP_RETCONSTN 160 /* return const without incref (e.g. number) */ +#define DUK_OP_LABEL 161 +#define DUK_OP_ENDLABEL 162 +#define DUK_OP_BREAK 163 +#define DUK_OP_CONTINUE 164 +#define DUK_OP_TRYCATCH 165 +#define DUK_OP_ENDTRY 166 +#define DUK_OP_ENDCATCH 167 +#define DUK_OP_ENDFIN 168 +#define DUK_OP_THROW 169 +#define DUK_OP_INVLHS 170 +#define DUK_OP_CSREG 171 +#define DUK_OP_CSVAR 172 +#define DUK_OP_CSVAR_RR 172 +#define DUK_OP_CSVAR_CR 173 +#define DUK_OP_CSVAR_RC 174 +#define DUK_OP_CSVAR_CC 175 +#define DUK_OP_CALL0 176 /* DUK_OP_CALL0 & 0x0F must be zero. */ +#define DUK_OP_CALL1 177 +#define DUK_OP_CALL2 178 +#define DUK_OP_CALL3 179 +#define DUK_OP_CALL4 180 +#define DUK_OP_CALL5 181 +#define DUK_OP_CALL6 182 +#define DUK_OP_CALL7 183 +#define DUK_OP_CALL8 184 +#define DUK_OP_CALL9 185 +#define DUK_OP_CALL10 186 +#define DUK_OP_CALL11 187 +#define DUK_OP_CALL12 188 +#define DUK_OP_CALL13 189 +#define DUK_OP_CALL14 190 +#define DUK_OP_CALL15 191 +#define DUK_OP_NEWOBJ 192 +#define DUK_OP_NEWARR 193 +#define DUK_OP_MPUTOBJ 194 +#define DUK_OP_MPUTOBJI 195 +#define DUK_OP_INITSET 196 +#define DUK_OP_INITGET 197 +#define DUK_OP_MPUTARR 198 +#define DUK_OP_MPUTARRI 199 +#define DUK_OP_SETALEN 200 +#define DUK_OP_INITENUM 201 +#define DUK_OP_NEXTENUM 202 +#define DUK_OP_NEWTARGET 203 +#define DUK_OP_DEBUGGER 204 +#define DUK_OP_NOP 205 +#define DUK_OP_INVALID 206 +#define DUK_OP_UNUSED207 207 +#define DUK_OP_GETPROPC 208 +#define DUK_OP_GETPROPC_RR 208 +#define DUK_OP_GETPROPC_CR 209 +#define DUK_OP_GETPROPC_RC 210 +#define DUK_OP_GETPROPC_CC 211 +#define DUK_OP_UNUSED212 212 +#define DUK_OP_UNUSED213 213 +#define DUK_OP_UNUSED214 214 +#define DUK_OP_UNUSED215 215 +#define DUK_OP_UNUSED216 216 +#define DUK_OP_UNUSED217 217 +#define DUK_OP_UNUSED218 218 +#define DUK_OP_UNUSED219 219 +#define DUK_OP_UNUSED220 220 +#define DUK_OP_UNUSED221 221 +#define DUK_OP_UNUSED222 222 +#define DUK_OP_UNUSED223 223 +#define DUK_OP_UNUSED224 224 +#define DUK_OP_UNUSED225 225 +#define DUK_OP_UNUSED226 226 +#define DUK_OP_UNUSED227 227 +#define DUK_OP_UNUSED228 228 +#define DUK_OP_UNUSED229 229 +#define DUK_OP_UNUSED230 230 +#define DUK_OP_UNUSED231 231 +#define DUK_OP_UNUSED232 232 +#define DUK_OP_UNUSED233 233 +#define DUK_OP_UNUSED234 234 +#define DUK_OP_UNUSED235 235 +#define DUK_OP_UNUSED236 236 +#define DUK_OP_UNUSED237 237 +#define DUK_OP_UNUSED238 238 +#define DUK_OP_UNUSED239 239 +#define DUK_OP_UNUSED240 240 +#define DUK_OP_UNUSED241 241 +#define DUK_OP_UNUSED242 242 +#define DUK_OP_UNUSED243 243 +#define DUK_OP_UNUSED244 244 +#define DUK_OP_UNUSED245 245 +#define DUK_OP_UNUSED246 246 +#define DUK_OP_UNUSED247 247 +#define DUK_OP_UNUSED248 248 +#define DUK_OP_UNUSED249 249 +#define DUK_OP_UNUSED250 250 +#define DUK_OP_UNUSED251 251 +#define DUK_OP_UNUSED252 252 +#define DUK_OP_UNUSED253 253 +#define DUK_OP_UNUSED254 254 +#define DUK_OP_UNUSED255 255 +#define DUK_OP_NONE 256 /* dummy value used as marker (doesn't fit in 8-bit field) */ + +/* XXX: Allocate flags from opcode field? Would take 16 opcode slots + * but avoids shuffling in more cases. Maybe not worth it. + */ +/* DUK_OP_TRYCATCH flags in A. */ +#define DUK_BC_TRYCATCH_FLAG_HAVE_CATCH (1U << 0) +#define DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY (1U << 1) +#define DUK_BC_TRYCATCH_FLAG_CATCH_BINDING (1U << 2) +#define DUK_BC_TRYCATCH_FLAG_WITH_BINDING (1U << 3) + +/* DUK_OP_DECLVAR flags in A; bottom bits are reserved for propdesc flags + * (DUK_PROPDESC_FLAG_XXX). + */ +#define DUK_BC_DECLVAR_FLAG_FUNC_DECL (1U << 4) /* function declaration */ + +/* DUK_OP_CALLn flags, part of opcode field. Three lowest bits must match + * DUK_CALL_FLAG_xxx directly. + */ +#define DUK_BC_CALL_FLAG_TAILCALL (1U << 0) +#define DUK_BC_CALL_FLAG_CONSTRUCT (1U << 1) +#define DUK_BC_CALL_FLAG_CALLED_AS_EVAL (1U << 2) +#define DUK_BC_CALL_FLAG_INDIRECT (1U << 3) + +/* Misc constants and helper macros. */ +#define DUK_BC_LDINT_BIAS (1L << 15) +#define DUK_BC_LDINTX_SHIFT 16 +#define DUK_BC_JUMP_BIAS (1L << 23) + +#endif /* DUK_JS_BYTECODE_H_INCLUDED */ +/* #include duk_lexer.h */ +#line 1 "duk_lexer.h" +/* + * Lexer defines. + */ + +#if !defined(DUK_LEXER_H_INCLUDED) +#define DUK_LEXER_H_INCLUDED + +typedef void (*duk_re_range_callback)(void *user, duk_codepoint_t r1, duk_codepoint_t r2, duk_bool_t direct); + +/* + * A token is interpreted as any possible production of InputElementDiv + * and InputElementRegExp, see E5 Section 7 in its entirety. Note that + * the E5 "Token" production does not cover all actual tokens of the + * language (which is explicitly stated in the specification, Section 7.5). + * Null and boolean literals are defined as part of both ReservedWord + * (E5 Section 7.6.1) and Literal (E5 Section 7.8) productions. Here, + * null and boolean values have literal tokens, and are not reserved + * words. + * + * Decimal literal negative/positive sign is -not- part of DUK_TOK_NUMBER. + * The number tokens always have a non-negative value. The unary minus + * operator in "-1.0" is optimized during compilation to yield a single + * negative constant. + * + * Token numbering is free except that reserved words are required to be + * in a continuous range and in a particular order. See genstrings.py. + */ + +#define DUK_LEXER_INITCTX(ctx) duk_lexer_initctx((ctx)) + +#define DUK_LEXER_SETPOINT(ctx,pt) duk_lexer_setpoint((ctx), (pt)) + +#define DUK_LEXER_GETPOINT(ctx,pt) duk_lexer_getpoint((ctx), (pt)) + +/* Currently 6 characters of lookup are actually needed (duk_lexer.c). */ +#define DUK_LEXER_WINDOW_SIZE 6 +#if defined(DUK_USE_LEXER_SLIDING_WINDOW) +#define DUK_LEXER_BUFFER_SIZE 64 +#endif + +#define DUK_TOK_MINVAL 0 + +/* returned after EOF (infinite amount) */ +#define DUK_TOK_EOF 0 + +/* identifier names (E5 Section 7.6) */ +#define DUK_TOK_IDENTIFIER 1 + +/* reserved words: keywords */ +#define DUK_TOK_START_RESERVED 2 +#define DUK_TOK_BREAK 2 +#define DUK_TOK_CASE 3 +#define DUK_TOK_CATCH 4 +#define DUK_TOK_CONTINUE 5 +#define DUK_TOK_DEBUGGER 6 +#define DUK_TOK_DEFAULT 7 +#define DUK_TOK_DELETE 8 +#define DUK_TOK_DO 9 +#define DUK_TOK_ELSE 10 +#define DUK_TOK_FINALLY 11 +#define DUK_TOK_FOR 12 +#define DUK_TOK_FUNCTION 13 +#define DUK_TOK_IF 14 +#define DUK_TOK_IN 15 +#define DUK_TOK_INSTANCEOF 16 +#define DUK_TOK_NEW 17 +#define DUK_TOK_RETURN 18 +#define DUK_TOK_SWITCH 19 +#define DUK_TOK_THIS 20 +#define DUK_TOK_THROW 21 +#define DUK_TOK_TRY 22 +#define DUK_TOK_TYPEOF 23 +#define DUK_TOK_VAR 24 +#define DUK_TOK_CONST 25 +#define DUK_TOK_VOID 26 +#define DUK_TOK_WHILE 27 +#define DUK_TOK_WITH 28 + +/* reserved words: future reserved words */ +#define DUK_TOK_CLASS 29 +#define DUK_TOK_ENUM 30 +#define DUK_TOK_EXPORT 31 +#define DUK_TOK_EXTENDS 32 +#define DUK_TOK_IMPORT 33 +#define DUK_TOK_SUPER 34 + +/* "null", "true", and "false" are always reserved words. + * Note that "get" and "set" are not! + */ +#define DUK_TOK_NULL 35 +#define DUK_TOK_TRUE 36 +#define DUK_TOK_FALSE 37 + +/* reserved words: additional future reserved words in strict mode */ +#define DUK_TOK_START_STRICT_RESERVED 38 /* inclusive */ +#define DUK_TOK_IMPLEMENTS 38 +#define DUK_TOK_INTERFACE 39 +#define DUK_TOK_LET 40 +#define DUK_TOK_PACKAGE 41 +#define DUK_TOK_PRIVATE 42 +#define DUK_TOK_PROTECTED 43 +#define DUK_TOK_PUBLIC 44 +#define DUK_TOK_STATIC 45 +#define DUK_TOK_YIELD 46 + +#define DUK_TOK_END_RESERVED 47 /* exclusive */ + +/* "get" and "set" are tokens but NOT ReservedWords. They are currently + * parsed and identifiers and these defines are actually now unused. + */ +#define DUK_TOK_GET 47 +#define DUK_TOK_SET 48 + +/* punctuators (unlike the spec, also includes "/" and "/=") */ +#define DUK_TOK_LCURLY 49 +#define DUK_TOK_RCURLY 50 +#define DUK_TOK_LBRACKET 51 +#define DUK_TOK_RBRACKET 52 +#define DUK_TOK_LPAREN 53 +#define DUK_TOK_RPAREN 54 +#define DUK_TOK_PERIOD 55 +#define DUK_TOK_SEMICOLON 56 +#define DUK_TOK_COMMA 57 +#define DUK_TOK_LT 58 +#define DUK_TOK_GT 59 +#define DUK_TOK_LE 60 +#define DUK_TOK_GE 61 +#define DUK_TOK_EQ 62 +#define DUK_TOK_NEQ 63 +#define DUK_TOK_SEQ 64 +#define DUK_TOK_SNEQ 65 +#define DUK_TOK_ADD 66 +#define DUK_TOK_SUB 67 +#define DUK_TOK_MUL 68 +#define DUK_TOK_DIV 69 +#define DUK_TOK_MOD 70 +#define DUK_TOK_EXP 71 +#define DUK_TOK_INCREMENT 72 +#define DUK_TOK_DECREMENT 73 +#define DUK_TOK_ALSHIFT 74 /* named "arithmetic" because result is signed */ +#define DUK_TOK_ARSHIFT 75 +#define DUK_TOK_RSHIFT 76 +#define DUK_TOK_BAND 77 +#define DUK_TOK_BOR 78 +#define DUK_TOK_BXOR 79 +#define DUK_TOK_LNOT 80 +#define DUK_TOK_BNOT 81 +#define DUK_TOK_LAND 82 +#define DUK_TOK_LOR 83 +#define DUK_TOK_QUESTION 84 +#define DUK_TOK_COLON 85 +#define DUK_TOK_EQUALSIGN 86 +#define DUK_TOK_ADD_EQ 87 +#define DUK_TOK_SUB_EQ 88 +#define DUK_TOK_MUL_EQ 89 +#define DUK_TOK_DIV_EQ 90 +#define DUK_TOK_MOD_EQ 91 +#define DUK_TOK_EXP_EQ 92 +#define DUK_TOK_ALSHIFT_EQ 93 +#define DUK_TOK_ARSHIFT_EQ 94 +#define DUK_TOK_RSHIFT_EQ 95 +#define DUK_TOK_BAND_EQ 96 +#define DUK_TOK_BOR_EQ 97 +#define DUK_TOK_BXOR_EQ 98 + +/* literals (E5 Section 7.8), except null, true, false, which are treated + * like reserved words (above). + */ +#define DUK_TOK_NUMBER 99 +#define DUK_TOK_STRING 100 +#define DUK_TOK_REGEXP 101 + +#define DUK_TOK_MAXVAL 101 /* inclusive */ + +#define DUK_TOK_INVALID DUK_SMALL_UINT_MAX + +/* Convert heap string index to a token (reserved words) */ +#define DUK_STRIDX_TO_TOK(x) ((x) - DUK_STRIDX_START_RESERVED + DUK_TOK_START_RESERVED) + +/* Sanity check */ +#if (DUK_TOK_MAXVAL > 255) +#error DUK_TOK_MAXVAL too large, code assumes it fits into 8 bits +#endif + +/* Sanity checks for string and token defines */ +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_BREAK) != DUK_TOK_BREAK) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_CASE) != DUK_TOK_CASE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_CATCH) != DUK_TOK_CATCH) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_CONTINUE) != DUK_TOK_CONTINUE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_DEBUGGER) != DUK_TOK_DEBUGGER) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_DEFAULT) != DUK_TOK_DEFAULT) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_DELETE) != DUK_TOK_DELETE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_DO) != DUK_TOK_DO) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_ELSE) != DUK_TOK_ELSE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_FINALLY) != DUK_TOK_FINALLY) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_FOR) != DUK_TOK_FOR) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_LC_FUNCTION) != DUK_TOK_FUNCTION) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_IF) != DUK_TOK_IF) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_IN) != DUK_TOK_IN) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_INSTANCEOF) != DUK_TOK_INSTANCEOF) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_NEW) != DUK_TOK_NEW) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_RETURN) != DUK_TOK_RETURN) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_SWITCH) != DUK_TOK_SWITCH) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_THIS) != DUK_TOK_THIS) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_THROW) != DUK_TOK_THROW) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_TRY) != DUK_TOK_TRY) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_TYPEOF) != DUK_TOK_TYPEOF) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_VAR) != DUK_TOK_VAR) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_VOID) != DUK_TOK_VOID) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_WHILE) != DUK_TOK_WHILE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_WITH) != DUK_TOK_WITH) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_CLASS) != DUK_TOK_CLASS) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_CONST) != DUK_TOK_CONST) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_ENUM) != DUK_TOK_ENUM) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_EXPORT) != DUK_TOK_EXPORT) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_EXTENDS) != DUK_TOK_EXTENDS) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_IMPORT) != DUK_TOK_IMPORT) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_SUPER) != DUK_TOK_SUPER) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_LC_NULL) != DUK_TOK_NULL) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_TRUE) != DUK_TOK_TRUE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_FALSE) != DUK_TOK_FALSE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_IMPLEMENTS) != DUK_TOK_IMPLEMENTS) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_INTERFACE) != DUK_TOK_INTERFACE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_LET) != DUK_TOK_LET) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_PACKAGE) != DUK_TOK_PACKAGE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_PRIVATE) != DUK_TOK_PRIVATE) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_PROTECTED) != DUK_TOK_PROTECTED) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_PUBLIC) != DUK_TOK_PUBLIC) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_STATIC) != DUK_TOK_STATIC) +#error mismatch in token defines +#endif +#if (DUK_STRIDX_TO_TOK(DUK_STRIDX_YIELD) != DUK_TOK_YIELD) +#error mismatch in token defines +#endif + +/* Regexp tokens */ +#define DUK_RETOK_EOF 0 +#define DUK_RETOK_DISJUNCTION 1 +#define DUK_RETOK_QUANTIFIER 2 +#define DUK_RETOK_ASSERT_START 3 +#define DUK_RETOK_ASSERT_END 4 +#define DUK_RETOK_ASSERT_WORD_BOUNDARY 5 +#define DUK_RETOK_ASSERT_NOT_WORD_BOUNDARY 6 +#define DUK_RETOK_ASSERT_START_POS_LOOKAHEAD 7 +#define DUK_RETOK_ASSERT_START_NEG_LOOKAHEAD 8 +#define DUK_RETOK_ATOM_PERIOD 9 +#define DUK_RETOK_ATOM_CHAR 10 +#define DUK_RETOK_ATOM_DIGIT 11 /* assumptions in regexp compiler */ +#define DUK_RETOK_ATOM_NOT_DIGIT 12 /* -""- */ +#define DUK_RETOK_ATOM_WHITE 13 /* -""- */ +#define DUK_RETOK_ATOM_NOT_WHITE 14 /* -""- */ +#define DUK_RETOK_ATOM_WORD_CHAR 15 /* -""- */ +#define DUK_RETOK_ATOM_NOT_WORD_CHAR 16 /* -""- */ +#define DUK_RETOK_ATOM_BACKREFERENCE 17 +#define DUK_RETOK_ATOM_START_CAPTURE_GROUP 18 +#define DUK_RETOK_ATOM_START_NONCAPTURE_GROUP 19 +#define DUK_RETOK_ATOM_START_CHARCLASS 20 +#define DUK_RETOK_ATOM_START_CHARCLASS_INVERTED 21 +#define DUK_RETOK_ATOM_END_GROUP 22 + +/* Constants for duk_lexer_ctx.buf. */ +#define DUK_LEXER_TEMP_BUF_LIMIT 256 + +/* A token value. Can be memcpy()'d, but note that slot1/slot2 values are on the valstack. + * Some fields (like num, str1, str2) are only valid for specific token types and may have + * stale values otherwise. + */ +struct duk_token { + duk_small_uint_t t; /* token type (with reserved word identification) */ + duk_small_uint_t t_nores; /* token type (with reserved words as DUK_TOK_IDENTIFER) */ + duk_double_t num; /* numeric value of token */ + duk_hstring *str1; /* string 1 of token (borrowed, stored to ctx->slot1_idx) */ + duk_hstring *str2; /* string 2 of token (borrowed, stored to ctx->slot2_idx) */ + duk_size_t start_offset; /* start byte offset of token in lexer input */ + duk_int_t start_line; /* start line of token (first char) */ + duk_int_t num_escapes; /* number of escapes and line continuations (for directive prologue) */ + duk_bool_t lineterm; /* token was preceded by a lineterm */ + duk_bool_t allow_auto_semi; /* token allows automatic semicolon insertion (eof or preceded by newline) */ +}; + +#define DUK_RE_QUANTIFIER_INFINITE ((duk_uint32_t) 0xffffffffUL) + +/* A regexp token value. */ +struct duk_re_token { + duk_small_uint_t t; /* token type */ + duk_small_uint_t greedy; + duk_uint32_t num; /* numeric value (character, count) */ + duk_uint32_t qmin; + duk_uint32_t qmax; +}; + +/* A structure for 'snapshotting' a point for rewinding */ +struct duk_lexer_point { + duk_size_t offset; + duk_int_t line; +}; + +/* Lexer codepoint with additional info like offset/line number */ +struct duk_lexer_codepoint { + duk_codepoint_t codepoint; + duk_size_t offset; + duk_int_t line; +}; + +/* Lexer context. Same context is used for ECMAScript and Regexp parsing. */ +struct duk_lexer_ctx { +#if defined(DUK_USE_LEXER_SLIDING_WINDOW) + duk_lexer_codepoint *window; /* unicode code points, window[0] is always next, points to 'buffer' */ + duk_lexer_codepoint buffer[DUK_LEXER_BUFFER_SIZE]; +#else + duk_lexer_codepoint window[DUK_LEXER_WINDOW_SIZE]; /* unicode code points, window[0] is always next */ +#endif + + duk_hthread *thr; /* thread; minimizes argument passing */ + + const duk_uint8_t *input; /* input string (may be a user pointer) */ + duk_size_t input_length; /* input byte length */ + duk_size_t input_offset; /* input offset for window leading edge (not window[0]) */ + duk_int_t input_line; /* input linenumber at input_offset (not window[0]), init to 1 */ + + duk_idx_t slot1_idx; /* valstack slot for 1st token value */ + duk_idx_t slot2_idx; /* valstack slot for 2nd token value */ + duk_idx_t buf_idx; /* valstack slot for temp buffer */ + duk_hbuffer_dynamic *buf; /* temp accumulation buffer */ + duk_bufwriter_ctx bw; /* bufwriter for temp accumulation */ + + duk_int_t token_count; /* number of tokens parsed */ + duk_int_t token_limit; /* maximum token count before error (sanity backstop) */ + + duk_small_uint_t flags; /* lexer flags, use compiler flag defines for now */ +}; + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL void duk_lexer_initctx(duk_lexer_ctx *lex_ctx); + +DUK_INTERNAL_DECL void duk_lexer_getpoint(duk_lexer_ctx *lex_ctx, duk_lexer_point *pt); +DUK_INTERNAL_DECL void duk_lexer_setpoint(duk_lexer_ctx *lex_ctx, duk_lexer_point *pt); + +DUK_INTERNAL_DECL +void duk_lexer_parse_js_input_element(duk_lexer_ctx *lex_ctx, + duk_token *out_token, + duk_bool_t strict_mode, + duk_bool_t regexp_mode); +#if defined(DUK_USE_REGEXP_SUPPORT) +DUK_INTERNAL_DECL void duk_lexer_parse_re_token(duk_lexer_ctx *lex_ctx, duk_re_token *out_token); +DUK_INTERNAL_DECL void duk_lexer_parse_re_ranges(duk_lexer_ctx *lex_ctx, duk_re_range_callback gen_range, void *userdata); +#endif /* DUK_USE_REGEXP_SUPPORT */ + +#endif /* DUK_LEXER_H_INCLUDED */ +/* #include duk_js_compiler.h */ +#line 1 "duk_js_compiler.h" +/* + * ECMAScript compiler. + */ + +#if !defined(DUK_JS_COMPILER_H_INCLUDED) +#define DUK_JS_COMPILER_H_INCLUDED + +/* ECMAScript compiler limits */ +#define DUK_COMPILER_TOKEN_LIMIT 100000000L /* 1e8: protects against deeply nested inner functions */ + +/* maximum loopcount for peephole optimization */ +#define DUK_COMPILER_PEEPHOLE_MAXITER 3 + +/* maximum bytecode length in instructions */ +#define DUK_COMPILER_MAX_BYTECODE_LENGTH (256L * 1024L * 1024L) /* 1 GB */ + +/* + * Compiler intermediate values + * + * Intermediate values describe either plain values (e.g. strings or + * numbers) or binary operations which have not yet been coerced into + * either a left-hand-side or right-hand-side role (e.g. object property). + */ + +#define DUK_IVAL_NONE 0 /* no value */ +#define DUK_IVAL_PLAIN 1 /* register, constant, or value */ +#define DUK_IVAL_ARITH 2 /* binary arithmetic; DUK_OP_ADD, DUK_OP_EQ, other binary ops */ +#define DUK_IVAL_PROP 3 /* property access */ +#define DUK_IVAL_VAR 4 /* variable access */ + +#define DUK_ISPEC_NONE 0 /* no value */ +#define DUK_ISPEC_VALUE 1 /* value resides in 'valstack_idx' */ +#define DUK_ISPEC_REGCONST 2 /* value resides in a register or constant */ + +/* Bit mask which indicates that a regconst is a constant instead of a register. + * Chosen so that when a regconst is cast to duk_int32_t, all consts are + * negative values. + */ +#define DUK_REGCONST_CONST_MARKER DUK_INT32_MIN /* = -0x80000000 */ + +/* Type to represent a reg/const reference during compilation, with <0 + * indicating a constant. Some call sites also use -1 to indicate 'none'. + */ +typedef duk_int32_t duk_regconst_t; + +typedef struct { + duk_small_uint_t t; /* DUK_ISPEC_XXX */ + duk_regconst_t regconst; + duk_idx_t valstack_idx; /* always set; points to a reserved valstack slot */ +} duk_ispec; + +typedef struct { + /* + * PLAIN: x1 + * ARITH: x1 <op> x2 + * PROP: x1.x2 + * VAR: x1 (name) + */ + + /* XXX: can be optimized for smaller footprint esp. on 32-bit environments */ + duk_small_uint_t t; /* DUK_IVAL_XXX */ + duk_small_uint_t op; /* bytecode opcode for binary ops */ + duk_ispec x1; + duk_ispec x2; +} duk_ivalue; + +/* + * Bytecode instruction representation during compilation + * + * Contains the actual instruction and (optionally) debug info. + */ + +struct duk_compiler_instr { + duk_instr_t ins; +#if defined(DUK_USE_PC2LINE) + duk_uint32_t line; +#endif +}; + +/* + * Compiler state + */ + +#define DUK_LABEL_FLAG_ALLOW_BREAK (1U << 0) +#define DUK_LABEL_FLAG_ALLOW_CONTINUE (1U << 1) + +#define DUK_DECL_TYPE_VAR 0 +#define DUK_DECL_TYPE_FUNC 1 + +/* XXX: optimize to 16 bytes */ +typedef struct { + duk_small_uint_t flags; + duk_int_t label_id; /* numeric label_id (-1 reserved as marker) */ + duk_hstring *h_label; /* borrowed label name */ + duk_int_t catch_depth; /* catch depth at point of definition */ + duk_int_t pc_label; /* pc of label statement: + * pc+1: break jump site + * pc+2: continue jump site + */ + + /* Fast jumps (which avoid longjmp) jump directly to the jump sites + * which are always known even while the iteration/switch statement + * is still being parsed. A final peephole pass "straightens out" + * the jumps. + */ +} duk_labelinfo; + +/* Compiling state of one function, eventually converted to duk_hcompfunc */ +struct duk_compiler_func { + /* These pointers are at the start of the struct so that they pack + * nicely. Mixing pointers and integer values is bad on some + * platforms (e.g. if int is 32 bits and pointers are 64 bits). + */ + + duk_bufwriter_ctx bw_code; /* bufwriter for code */ + + duk_hstring *h_name; /* function name (borrowed reference), ends up in _name */ + /* h_code: held in bw_code */ + duk_hobject *h_consts; /* array */ + duk_hobject *h_funcs; /* array of function templates: [func1, offset1, line1, func2, offset2, line2] + * offset/line points to closing brace to allow skipping on pass 2 + */ + duk_hobject *h_decls; /* array of declarations: [ name1, val1, name2, val2, ... ] + * valN = (typeN) | (fnum << 8), where fnum is inner func number (0 for vars) + * record function and variable declarations in pass 1 + */ + duk_hobject *h_labelnames; /* array of active label names */ + duk_hbuffer_dynamic *h_labelinfos; /* C array of duk_labelinfo */ + duk_hobject *h_argnames; /* array of formal argument names (-> _Formals) */ + duk_hobject *h_varmap; /* variable map for pass 2 (identifier -> register number or null (unmapped)) */ + + /* Value stack indices for tracking objects. */ + /* code_idx: not needed */ + duk_idx_t consts_idx; + duk_idx_t funcs_idx; + duk_idx_t decls_idx; + duk_idx_t labelnames_idx; + duk_idx_t labelinfos_idx; + duk_idx_t argnames_idx; + duk_idx_t varmap_idx; + + /* Temp reg handling. */ + duk_regconst_t temp_first; /* first register that is a temporary (below: variables) */ + duk_regconst_t temp_next; /* next temporary register to allocate */ + duk_regconst_t temp_max; /* highest value of temp_reg (temp_max - 1 is highest used reg) */ + + /* Shuffle registers if large number of regs/consts. */ + duk_regconst_t shuffle1; + duk_regconst_t shuffle2; + duk_regconst_t shuffle3; + + /* Stats for current expression being parsed. */ + duk_int_t nud_count; + duk_int_t led_count; + duk_int_t paren_level; /* parenthesis count, 0 = top level */ + duk_bool_t expr_lhs; /* expression is left-hand-side compatible */ + duk_bool_t allow_in; /* current paren level allows 'in' token */ + + /* Misc. */ + duk_int_t stmt_next; /* statement id allocation (running counter) */ + duk_int_t label_next; /* label id allocation (running counter) */ + duk_int_t catch_depth; /* catch stack depth */ + duk_int_t with_depth; /* with stack depth (affects identifier lookups) */ + duk_int_t fnum_next; /* inner function numbering */ + duk_int_t num_formals; /* number of formal arguments */ + duk_regconst_t reg_stmt_value; /* register for writing value of 'non-empty' statements (global or eval code), -1 is marker */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_int_t min_line; /* XXX: typing (duk_hcompfunc has duk_uint32_t) */ + duk_int_t max_line; +#endif + + /* Status booleans. */ + duk_uint8_t is_function; /* is an actual function (not global/eval code) */ + duk_uint8_t is_eval; /* is eval code */ + duk_uint8_t is_global; /* is global code */ + duk_uint8_t is_namebinding; /* needs a name binding */ + duk_uint8_t is_constructable; /* result is constructable */ + duk_uint8_t is_setget; /* is a setter/getter */ + duk_uint8_t is_strict; /* function is strict */ + duk_uint8_t is_notail; /* function must not be tail called */ + duk_uint8_t in_directive_prologue; /* parsing in "directive prologue", recognize directives */ + duk_uint8_t in_scanning; /* parsing in "scanning" phase (first pass) */ + duk_uint8_t may_direct_eval; /* function may call direct eval */ + duk_uint8_t id_access_arguments; /* function refers to 'arguments' identifier */ + duk_uint8_t id_access_slow; /* function makes one or more slow path accesses that won't match own static variables */ + duk_uint8_t id_access_slow_own; /* function makes one or more slow path accesses that may match own static variables */ + duk_uint8_t is_arguments_shadowed; /* argument/function declaration shadows 'arguments' */ + duk_uint8_t needs_shuffle; /* function needs shuffle registers */ + duk_uint8_t reject_regexp_in_adv; /* reject RegExp literal on next advance() call; needed for handling IdentifierName productions */ + duk_uint8_t allow_regexp_in_adv; /* allow RegExp literal on next advance() call */ +}; + +struct duk_compiler_ctx { + duk_hthread *thr; + + /* filename being compiled (ends up in functions' '_filename' property) */ + duk_hstring *h_filename; /* borrowed reference */ + + /* lexing (tokenization) state (contains two valstack slot indices) */ + duk_lexer_ctx lex; + + /* current and previous token for parsing */ + duk_token prev_token; + duk_token curr_token; + duk_idx_t tok11_idx; /* curr_token slot1 (matches 'lex' slot1_idx) */ + duk_idx_t tok12_idx; /* curr_token slot2 (matches 'lex' slot2_idx) */ + duk_idx_t tok21_idx; /* prev_token slot1 */ + duk_idx_t tok22_idx; /* prev_token slot2 */ + + /* recursion limit */ + duk_int_t recursion_depth; + duk_int_t recursion_limit; + + /* code emission temporary */ + duk_int_t emit_jumpslot_pc; + + /* current function being compiled (embedded instead of pointer for more compact access) */ + duk_compiler_func curr_func; +}; + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL void duk_js_compile(duk_hthread *thr, const duk_uint8_t *src_buffer, duk_size_t src_length, duk_small_uint_t flags); + +#endif /* DUK_JS_COMPILER_H_INCLUDED */ +/* #include duk_regexp.h */ +#line 1 "duk_regexp.h" +/* + * Regular expression structs, constants, and bytecode defines. + */ + +#if !defined(DUK_REGEXP_H_INCLUDED) +#define DUK_REGEXP_H_INCLUDED + +/* maximum bytecode copies for {n,m} quantifiers */ +#define DUK_RE_MAX_ATOM_COPIES 1000 + +/* regexp compilation limits */ +#define DUK_RE_COMPILE_TOKEN_LIMIT 100000000L /* 1e8 */ + +/* regexp execution limits */ +#define DUK_RE_EXECUTE_STEPS_LIMIT 1000000000L /* 1e9 */ + +/* regexp opcodes */ +#define DUK_REOP_MATCH 1 +#define DUK_REOP_CHAR 2 +#define DUK_REOP_PERIOD 3 +#define DUK_REOP_RANGES 4 +#define DUK_REOP_INVRANGES 5 +#define DUK_REOP_JUMP 6 +#define DUK_REOP_SPLIT1 7 +#define DUK_REOP_SPLIT2 8 +#define DUK_REOP_SQMINIMAL 9 +#define DUK_REOP_SQGREEDY 10 +#define DUK_REOP_SAVE 11 +#define DUK_REOP_WIPERANGE 12 +#define DUK_REOP_LOOKPOS 13 +#define DUK_REOP_LOOKNEG 14 +#define DUK_REOP_BACKREFERENCE 15 +#define DUK_REOP_ASSERT_START 16 +#define DUK_REOP_ASSERT_END 17 +#define DUK_REOP_ASSERT_WORD_BOUNDARY 18 +#define DUK_REOP_ASSERT_NOT_WORD_BOUNDARY 19 + +/* flags */ +#define DUK_RE_FLAG_GLOBAL (1U << 0) +#define DUK_RE_FLAG_IGNORE_CASE (1U << 1) +#define DUK_RE_FLAG_MULTILINE (1U << 2) + +struct duk_re_matcher_ctx { + duk_hthread *thr; + + duk_uint32_t re_flags; + const duk_uint8_t *input; + const duk_uint8_t *input_end; + const duk_uint8_t *bytecode; + const duk_uint8_t *bytecode_end; + const duk_uint8_t **saved; /* allocated from valstack (fixed buffer) */ + duk_uint32_t nsaved; + duk_uint32_t recursion_depth; + duk_uint32_t recursion_limit; + duk_uint32_t steps_count; + duk_uint32_t steps_limit; +}; + +struct duk_re_compiler_ctx { + duk_hthread *thr; + + duk_uint32_t re_flags; + duk_lexer_ctx lex; + duk_re_token curr_token; + duk_bufwriter_ctx bw; + duk_uint32_t captures; /* highest capture number emitted so far (used as: ++captures) */ + duk_uint32_t highest_backref; + duk_uint32_t recursion_depth; + duk_uint32_t recursion_limit; + duk_uint32_t nranges; /* internal temporary value, used for char classes */ +}; + +/* + * Prototypes + */ + +#if defined(DUK_USE_REGEXP_SUPPORT) +DUK_INTERNAL_DECL void duk_regexp_compile(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_regexp_create_instance(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_regexp_match(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_regexp_match_force_global(duk_hthread *thr); /* hacky helper for String.prototype.split() */ +#endif + +#endif /* DUK_REGEXP_H_INCLUDED */ +/* #include duk_heaphdr.h */ +#line 1 "duk_heaphdr.h" +/* + * Heap header definition and assorted macros, including ref counting. + * Access all fields through the accessor macros. + */ + +#if !defined(DUK_HEAPHDR_H_INCLUDED) +#define DUK_HEAPHDR_H_INCLUDED + +/* + * Common heap header + * + * All heap objects share the same flags and refcount fields. Objects other + * than strings also need to have a single or double linked list pointers + * for insertion into the "heap allocated" list. Strings have single linked + * list pointers for string table chaining. + * + * Technically, 'h_refcount' must be wide enough to guarantee that it cannot + * wrap; otherwise objects might be freed incorrectly after wrapping. The + * default refcount field is 32 bits even on 64-bit systems: while that's in + * theory incorrect, the Duktape heap needs to be larger than 64GB for the + * count to actually wrap (assuming 16-byte duk_tvals). This is very unlikely + * to ever be an issue, but if it is, disabling DUK_USE_REFCOUNT32 causes + * Duktape to use size_t for refcounts which should always be safe. + * + * Heap header size on 32-bit platforms: 8 bytes without reference counting, + * 16 bytes with reference counting. + * + * Note that 'raw' macros such as DUK_HEAPHDR_GET_REFCOUNT() are not + * defined without DUK_USE_REFERENCE_COUNTING, so caller must #if defined() + * around them. + */ + +/* XXX: macro for shared header fields (avoids some padding issues) */ + +struct duk_heaphdr { + duk_uint32_t h_flags; + +#if defined(DUK_USE_REFERENCE_COUNTING) +#if defined(DUK_USE_ASSERTIONS) + /* When assertions enabled, used by mark-and-sweep for refcount + * validation. Largest reasonable type; also detects overflows. + */ + duk_size_t h_assert_refcount; +#endif +#if defined(DUK_USE_REFCOUNT16) + duk_uint16_t h_refcount; +#elif defined(DUK_USE_REFCOUNT32) + duk_uint32_t h_refcount; +#else + duk_size_t h_refcount; +#endif +#endif /* DUK_USE_REFERENCE_COUNTING */ + +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t h_next16; +#else + duk_heaphdr *h_next; +#endif + +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) + /* refcounting requires direct heap frees, which in turn requires a dual linked heap */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t h_prev16; +#else + duk_heaphdr *h_prev; +#endif +#endif + + /* When DUK_USE_HEAPPTR16 (and DUK_USE_REFCOUNT16) is in use, the + * struct won't align nicely to 4 bytes. This 16-bit extra field + * is added to make the alignment clean; the field can be used by + * heap objects when 16-bit packing is used. This field is now + * conditional to DUK_USE_HEAPPTR16 only, but it is intended to be + * used with DUK_USE_REFCOUNT16 and DUK_USE_DOUBLE_LINKED_HEAP; + * this only matter to low memory environments anyway. + */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t h_extra16; +#endif +}; + +struct duk_heaphdr_string { + /* 16 bits would be enough for shared heaphdr flags and duk_hstring + * flags. The initial parts of duk_heaphdr_string and duk_heaphdr + * must match so changing the flags field size here would be quite + * awkward. However, to minimize struct size, we can pack at least + * 16 bits of duk_hstring data into the flags field. + */ + duk_uint32_t h_flags; + +#if defined(DUK_USE_REFERENCE_COUNTING) +#if defined(DUK_USE_ASSERTIONS) + /* When assertions enabled, used by mark-and-sweep for refcount + * validation. Largest reasonable type; also detects overflows. + */ + duk_size_t h_assert_refcount; +#endif +#if defined(DUK_USE_REFCOUNT16) + duk_uint16_t h_refcount; + duk_uint16_t h_strextra16; /* round out to 8 bytes */ +#elif defined(DUK_USE_REFCOUNT32) + duk_uint32_t h_refcount; +#else + duk_size_t h_refcount; +#endif +#else + duk_uint16_t h_strextra16; +#endif /* DUK_USE_REFERENCE_COUNTING */ + + duk_hstring *h_next; + /* No 'h_prev' pointer for strings. */ +}; + +#define DUK_HEAPHDR_FLAGS_TYPE_MASK 0x00000003UL +#define DUK_HEAPHDR_FLAGS_FLAG_MASK (~DUK_HEAPHDR_FLAGS_TYPE_MASK) + + /* 2 bits for heap type */ +#define DUK_HEAPHDR_FLAGS_HEAP_START 2 /* 5 heap flags */ +#define DUK_HEAPHDR_FLAGS_USER_START 7 /* 25 user flags */ + +#define DUK_HEAPHDR_HEAP_FLAG_NUMBER(n) (DUK_HEAPHDR_FLAGS_HEAP_START + (n)) +#define DUK_HEAPHDR_USER_FLAG_NUMBER(n) (DUK_HEAPHDR_FLAGS_USER_START + (n)) +#define DUK_HEAPHDR_HEAP_FLAG(n) (1UL << (DUK_HEAPHDR_FLAGS_HEAP_START + (n))) +#define DUK_HEAPHDR_USER_FLAG(n) (1UL << (DUK_HEAPHDR_FLAGS_USER_START + (n))) + +#define DUK_HEAPHDR_FLAG_REACHABLE DUK_HEAPHDR_HEAP_FLAG(0) /* mark-and-sweep: reachable */ +#define DUK_HEAPHDR_FLAG_TEMPROOT DUK_HEAPHDR_HEAP_FLAG(1) /* mark-and-sweep: children not processed */ +#define DUK_HEAPHDR_FLAG_FINALIZABLE DUK_HEAPHDR_HEAP_FLAG(2) /* mark-and-sweep: finalizable (on current pass) */ +#define DUK_HEAPHDR_FLAG_FINALIZED DUK_HEAPHDR_HEAP_FLAG(3) /* mark-and-sweep: finalized (on previous pass) */ +#define DUK_HEAPHDR_FLAG_READONLY DUK_HEAPHDR_HEAP_FLAG(4) /* read-only object, in code section */ + +#define DUK_HTYPE_MIN 0 +#define DUK_HTYPE_STRING 0 +#define DUK_HTYPE_OBJECT 1 +#define DUK_HTYPE_BUFFER 2 +#define DUK_HTYPE_MAX 2 + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HEAPHDR_GET_NEXT(heap,h) \ + ((duk_heaphdr *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->h_next16)) +#define DUK_HEAPHDR_SET_NEXT(heap,h,val) do { \ + (h)->h_next16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) val); \ + } while (0) +#else +#define DUK_HEAPHDR_GET_NEXT(heap,h) ((h)->h_next) +#define DUK_HEAPHDR_SET_NEXT(heap,h,val) do { \ + (h)->h_next = (val); \ + } while (0) +#endif + +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HEAPHDR_GET_PREV(heap,h) \ + ((duk_heaphdr *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->h_prev16)) +#define DUK_HEAPHDR_SET_PREV(heap,h,val) do { \ + (h)->h_prev16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (val)); \ + } while (0) +#else +#define DUK_HEAPHDR_GET_PREV(heap,h) ((h)->h_prev) +#define DUK_HEAPHDR_SET_PREV(heap,h,val) do { \ + (h)->h_prev = (val); \ + } while (0) +#endif +#endif + +#if defined(DUK_USE_REFERENCE_COUNTING) +#define DUK_HEAPHDR_GET_REFCOUNT(h) ((h)->h_refcount) +#define DUK_HEAPHDR_SET_REFCOUNT(h,val) do { \ + (h)->h_refcount = (val); \ + DUK_ASSERT((h)->h_refcount == (val)); /* No truncation. */ \ + } while (0) +#define DUK_HEAPHDR_PREINC_REFCOUNT(h) (++(h)->h_refcount) /* result: updated refcount */ +#define DUK_HEAPHDR_PREDEC_REFCOUNT(h) (--(h)->h_refcount) /* result: updated refcount */ +#else +/* refcount macros not defined without refcounting, caller must #if defined() now */ +#endif /* DUK_USE_REFERENCE_COUNTING */ + +/* + * Note: type is treated as a field separate from flags, so some masking is + * involved in the macros below. + */ + +#define DUK_HEAPHDR_GET_FLAGS_RAW(h) ((h)->h_flags) +#define DUK_HEAPHDR_SET_FLAGS_RAW(h,val) do { \ + (h)->h_flags = (val); } \ + } +#define DUK_HEAPHDR_GET_FLAGS(h) ((h)->h_flags & DUK_HEAPHDR_FLAGS_FLAG_MASK) +#define DUK_HEAPHDR_SET_FLAGS(h,val) do { \ + (h)->h_flags = ((h)->h_flags & ~(DUK_HEAPHDR_FLAGS_FLAG_MASK)) | (val); \ + } while (0) +#define DUK_HEAPHDR_GET_TYPE(h) ((h)->h_flags & DUK_HEAPHDR_FLAGS_TYPE_MASK) +#define DUK_HEAPHDR_SET_TYPE(h,val) do { \ + (h)->h_flags = ((h)->h_flags & ~(DUK_HEAPHDR_FLAGS_TYPE_MASK)) | (val); \ + } while (0) + +/* Comparison for type >= DUK_HTYPE_MIN skipped; because DUK_HTYPE_MIN is zero + * and the comparison is unsigned, it's always true and generates warnings. + */ +#define DUK_HEAPHDR_HTYPE_VALID(h) ( \ + DUK_HEAPHDR_GET_TYPE((h)) <= DUK_HTYPE_MAX \ + ) + +#define DUK_HEAPHDR_SET_TYPE_AND_FLAGS(h,tval,fval) do { \ + (h)->h_flags = ((tval) & DUK_HEAPHDR_FLAGS_TYPE_MASK) | \ + ((fval) & DUK_HEAPHDR_FLAGS_FLAG_MASK); \ + } while (0) + +#define DUK_HEAPHDR_SET_FLAG_BITS(h,bits) do { \ + DUK_ASSERT(((bits) & ~(DUK_HEAPHDR_FLAGS_FLAG_MASK)) == 0); \ + (h)->h_flags |= (bits); \ + } while (0) + +#define DUK_HEAPHDR_CLEAR_FLAG_BITS(h,bits) do { \ + DUK_ASSERT(((bits) & ~(DUK_HEAPHDR_FLAGS_FLAG_MASK)) == 0); \ + (h)->h_flags &= ~((bits)); \ + } while (0) + +#define DUK_HEAPHDR_CHECK_FLAG_BITS(h,bits) (((h)->h_flags & (bits)) != 0) + +#define DUK_HEAPHDR_SET_REACHABLE(h) DUK_HEAPHDR_SET_FLAG_BITS((h),DUK_HEAPHDR_FLAG_REACHABLE) +#define DUK_HEAPHDR_CLEAR_REACHABLE(h) DUK_HEAPHDR_CLEAR_FLAG_BITS((h),DUK_HEAPHDR_FLAG_REACHABLE) +#define DUK_HEAPHDR_HAS_REACHABLE(h) DUK_HEAPHDR_CHECK_FLAG_BITS((h),DUK_HEAPHDR_FLAG_REACHABLE) + +#define DUK_HEAPHDR_SET_TEMPROOT(h) DUK_HEAPHDR_SET_FLAG_BITS((h),DUK_HEAPHDR_FLAG_TEMPROOT) +#define DUK_HEAPHDR_CLEAR_TEMPROOT(h) DUK_HEAPHDR_CLEAR_FLAG_BITS((h),DUK_HEAPHDR_FLAG_TEMPROOT) +#define DUK_HEAPHDR_HAS_TEMPROOT(h) DUK_HEAPHDR_CHECK_FLAG_BITS((h),DUK_HEAPHDR_FLAG_TEMPROOT) + +#define DUK_HEAPHDR_SET_FINALIZABLE(h) DUK_HEAPHDR_SET_FLAG_BITS((h),DUK_HEAPHDR_FLAG_FINALIZABLE) +#define DUK_HEAPHDR_CLEAR_FINALIZABLE(h) DUK_HEAPHDR_CLEAR_FLAG_BITS((h),DUK_HEAPHDR_FLAG_FINALIZABLE) +#define DUK_HEAPHDR_HAS_FINALIZABLE(h) DUK_HEAPHDR_CHECK_FLAG_BITS((h),DUK_HEAPHDR_FLAG_FINALIZABLE) + +#define DUK_HEAPHDR_SET_FINALIZED(h) DUK_HEAPHDR_SET_FLAG_BITS((h),DUK_HEAPHDR_FLAG_FINALIZED) +#define DUK_HEAPHDR_CLEAR_FINALIZED(h) DUK_HEAPHDR_CLEAR_FLAG_BITS((h),DUK_HEAPHDR_FLAG_FINALIZED) +#define DUK_HEAPHDR_HAS_FINALIZED(h) DUK_HEAPHDR_CHECK_FLAG_BITS((h),DUK_HEAPHDR_FLAG_FINALIZED) + +#define DUK_HEAPHDR_SET_READONLY(h) DUK_HEAPHDR_SET_FLAG_BITS((h),DUK_HEAPHDR_FLAG_READONLY) +#define DUK_HEAPHDR_CLEAR_READONLY(h) DUK_HEAPHDR_CLEAR_FLAG_BITS((h),DUK_HEAPHDR_FLAG_READONLY) +#define DUK_HEAPHDR_HAS_READONLY(h) DUK_HEAPHDR_CHECK_FLAG_BITS((h),DUK_HEAPHDR_FLAG_READONLY) + +/* get or set a range of flags; m=first bit number, n=number of bits */ +#define DUK_HEAPHDR_GET_FLAG_RANGE(h,m,n) (((h)->h_flags >> (m)) & ((1UL << (n)) - 1UL)) + +#define DUK_HEAPHDR_SET_FLAG_RANGE(h,m,n,v) do { \ + (h)->h_flags = \ + ((h)->h_flags & (~(((1UL << (n)) - 1UL) << (m)))) \ + | ((v) << (m)); \ + } while (0) + +/* init pointer fields to null */ +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) +#define DUK_HEAPHDR_INIT_NULLS(h) do { \ + DUK_HEAPHDR_SET_NEXT((h), (void *) NULL); \ + DUK_HEAPHDR_SET_PREV((h), (void *) NULL); \ + } while (0) +#else +#define DUK_HEAPHDR_INIT_NULLS(h) do { \ + DUK_HEAPHDR_SET_NEXT((h), (void *) NULL); \ + } while (0) +#endif + +#define DUK_HEAPHDR_STRING_INIT_NULLS(h) do { \ + (h)->h_next = NULL; \ + } while (0) + +/* + * Type tests + */ + +/* Take advantage of the fact that for DUK_HTYPE_xxx numbers the lowest bit + * is only set for DUK_HTYPE_OBJECT (= 1). + */ +#if 0 +#define DUK_HEAPHDR_IS_OBJECT(h) (DUK_HEAPHDR_GET_TYPE((h)) == DUK_HTYPE_OBJECT) +#endif +#define DUK_HEAPHDR_IS_OBJECT(h) ((h)->h_flags & 0x01UL) +#define DUK_HEAPHDR_IS_STRING(h) (DUK_HEAPHDR_GET_TYPE((h)) == DUK_HTYPE_STRING) +#define DUK_HEAPHDR_IS_BUFFER(h) (DUK_HEAPHDR_GET_TYPE((h)) == DUK_HTYPE_BUFFER) + +/* + * Assert helpers + */ + +/* Check that prev/next links are consistent: if e.g. h->prev is != NULL, + * h->prev->next should point back to h. + */ +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) && defined(DUK_USE_ASSERTIONS) +#define DUK_ASSERT_HEAPHDR_LINKS(heap,h) do { \ + if ((h) != NULL) { \ + duk_heaphdr *h__prev, *h__next; \ + h__prev = DUK_HEAPHDR_GET_PREV((heap), (h)); \ + h__next = DUK_HEAPHDR_GET_NEXT((heap), (h)); \ + DUK_ASSERT(h__prev == NULL || (DUK_HEAPHDR_GET_NEXT((heap), h__prev) == (h))); \ + DUK_ASSERT(h__next == NULL || (DUK_HEAPHDR_GET_PREV((heap), h__next) == (h))); \ + } \ + } while (0) +#else +#define DUK_ASSERT_HEAPHDR_LINKS(heap,h) do {} while (0) +#endif + +#define DUK_ASSERT_HEAPHDR_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID((h))); \ + } while (0) + +#endif /* DUK_HEAPHDR_H_INCLUDED */ +/* #include duk_refcount.h */ +#line 1 "duk_refcount.h" +/* + * Reference counting helper macros. The macros take a thread argument + * and must thus always be executed in a specific thread context. The + * thread argument is not really needed anymore: DECREF can operate with + * a heap pointer only, and INCREF needs neither. + */ + +#if !defined(DUK_REFCOUNT_H_INCLUDED) +#define DUK_REFCOUNT_H_INCLUDED + +#if defined(DUK_USE_REFERENCE_COUNTING) + +#if defined(DUK_USE_ROM_OBJECTS) +/* With ROM objects "needs refcount update" is true when the value is + * heap allocated and is not a ROM object. + */ +/* XXX: double evaluation for 'tv' argument. */ +#define DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv) \ + (DUK_TVAL_IS_HEAP_ALLOCATED((tv)) && !DUK_HEAPHDR_HAS_READONLY(DUK_TVAL_GET_HEAPHDR((tv)))) +#define DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE(h) (!DUK_HEAPHDR_HAS_READONLY((h))) +#else /* DUK_USE_ROM_OBJECTS */ +/* Without ROM objects "needs refcount update" == is heap allocated. */ +#define DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv) DUK_TVAL_IS_HEAP_ALLOCATED((tv)) +#define DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE(h) 1 +#endif /* DUK_USE_ROM_OBJECTS */ + +/* Fast variants, inline refcount operations except for refzero handling. + * Can be used explicitly when speed is always more important than size. + * For a good compiler and a single file build, these are basically the + * same as a forced inline. + */ +#define DUK_TVAL_INCREF_FAST(thr,tv) do { \ + duk_tval *duk__tv = (tv); \ + DUK_ASSERT(duk__tv != NULL); \ + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(duk__tv)) { \ + duk_heaphdr *duk__h = DUK_TVAL_GET_HEAPHDR(duk__tv); \ + DUK_ASSERT(duk__h != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(duk__h)); \ + DUK_HEAPHDR_PREINC_REFCOUNT(duk__h); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(duk__h) != 0); /* No wrapping. */ \ + } \ + } while (0) +#define DUK_TVAL_DECREF_FAST(thr,tv) do { \ + duk_tval *duk__tv = (tv); \ + DUK_ASSERT(duk__tv != NULL); \ + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(duk__tv)) { \ + duk_heaphdr *duk__h = DUK_TVAL_GET_HEAPHDR(duk__tv); \ + DUK_ASSERT(duk__h != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(duk__h)); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(duk__h) > 0); \ + if (DUK_HEAPHDR_PREDEC_REFCOUNT(duk__h) == 0) { \ + duk_heaphdr_refzero((thr), duk__h); \ + } \ + } \ + } while (0) +#define DUK_TVAL_DECREF_NORZ_FAST(thr,tv) do { \ + duk_tval *duk__tv = (tv); \ + DUK_ASSERT(duk__tv != NULL); \ + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(duk__tv)) { \ + duk_heaphdr *duk__h = DUK_TVAL_GET_HEAPHDR(duk__tv); \ + DUK_ASSERT(duk__h != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(duk__h)); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(duk__h) > 0); \ + if (DUK_HEAPHDR_PREDEC_REFCOUNT(duk__h) == 0) { \ + duk_heaphdr_refzero_norz((thr), duk__h); \ + } \ + } \ + } while (0) +#define DUK_HEAPHDR_INCREF_FAST(thr,h) do { \ + duk_heaphdr *duk__h = (duk_heaphdr *) (h); \ + DUK_ASSERT(duk__h != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(duk__h)); \ + if (DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE(duk__h)) { \ + DUK_HEAPHDR_PREINC_REFCOUNT(duk__h); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(duk__h) != 0); /* No wrapping. */ \ + } \ + } while (0) +#define DUK_HEAPHDR_DECREF_FAST_RAW(thr,h,rzcall,rzcast) do { \ + duk_heaphdr *duk__h = (duk_heaphdr *) (h); \ + DUK_ASSERT(duk__h != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(duk__h)); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(duk__h) > 0); \ + if (DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE(duk__h)) { \ + if (DUK_HEAPHDR_PREDEC_REFCOUNT(duk__h) == 0) { \ + (rzcall)((thr), (rzcast) duk__h); \ + } \ + } \ + } while (0) +#define DUK_HEAPHDR_DECREF_FAST(thr,h) \ + DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_heaphdr_refzero,duk_heaphdr *) +#define DUK_HEAPHDR_DECREF_NORZ_FAST(thr,h) \ + DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_heaphdr_refzero_norz,duk_heaphdr *) + +/* Slow variants, call to a helper to reduce code size. + * Can be used explicitly when size is always more important than speed. + */ +#define DUK_TVAL_INCREF_SLOW(thr,tv) do { duk_tval_incref((tv)); } while (0) +#define DUK_TVAL_DECREF_SLOW(thr,tv) do { duk_tval_decref((thr), (tv)); } while (0) +#define DUK_TVAL_DECREF_NORZ_SLOW(thr,tv) do { duk_tval_decref_norz((thr), (tv)); } while (0) +#define DUK_HEAPHDR_INCREF_SLOW(thr,h) do { duk_heaphdr_incref((duk_heaphdr *) (h)); } while (0) +#define DUK_HEAPHDR_DECREF_SLOW(thr,h) do { duk_heaphdr_decref((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HEAPHDR_DECREF_NORZ_SLOW(thr,h) do { duk_heaphdr_decref_norz((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HSTRING_INCREF_SLOW(thr,h) do { duk_heaphdr_incref((duk_heaphdr *) (h)); } while (0) +#define DUK_HSTRING_DECREF_SLOW(thr,h) do { duk_heaphdr_decref((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HSTRING_DECREF_NORZ_SLOW(thr,h) do { duk_heaphdr_decref_norz((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HBUFFER_INCREF_SLOW(thr,h) do { duk_heaphdr_incref((duk_heaphdr *) (h)); } while (0) +#define DUK_HBUFFER_DECREF_SLOW(thr,h) do { duk_heaphdr_decref((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HBUFFER_DECREF_NORZ_SLOW(thr,h) do { duk_heaphdr_decref_norz((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HOBJECT_INCREF_SLOW(thr,h) do { duk_heaphdr_incref((duk_heaphdr *) (h)); } while (0) +#define DUK_HOBJECT_DECREF_SLOW(thr,h) do { duk_heaphdr_decref((thr), (duk_heaphdr *) (h)); } while (0) +#define DUK_HOBJECT_DECREF_NORZ_SLOW(thr,h) do { duk_heaphdr_decref_norz((thr), (duk_heaphdr *) (h)); } while (0) + +/* Default variants. Selection depends on speed/size preference. + * Concretely: with gcc 4.8.1 -Os x64 the difference in final binary + * is about +1kB for _FAST variants. + */ +#if defined(DUK_USE_FAST_REFCOUNT_DEFAULT) +/* XXX: It would be nice to specialize for specific duk_hobject subtypes + * but current refzero queue handling prevents that. + */ +#define DUK_TVAL_INCREF(thr,tv) DUK_TVAL_INCREF_FAST((thr),(tv)) +#define DUK_TVAL_DECREF(thr,tv) DUK_TVAL_DECREF_FAST((thr),(tv)) +#define DUK_TVAL_DECREF_NORZ(thr,tv) DUK_TVAL_DECREF_NORZ_FAST((thr),(tv)) +#define DUK_HEAPHDR_INCREF(thr,h) DUK_HEAPHDR_INCREF_FAST((thr),(h)) +#define DUK_HEAPHDR_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_heaphdr_refzero,duk_heaphdr *) +#define DUK_HEAPHDR_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_heaphdr_refzero_norz,duk_heaphdr *) +#define DUK_HSTRING_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) (h)) +#define DUK_HSTRING_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hstring_refzero,duk_hstring *) +#define DUK_HSTRING_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hstring_refzero,duk_hstring *) /* no 'norz' variant */ +#define DUK_HOBJECT_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) (h)) +#define DUK_HOBJECT_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero,duk_hobject *) +#define DUK_HOBJECT_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero_norz,duk_hobject *) +#define DUK_HBUFFER_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) (h)) +#define DUK_HBUFFER_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hbuffer_refzero,duk_hbuffer *) +#define DUK_HBUFFER_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hbuffer_refzero,duk_hbuffer *) /* no 'norz' variant */ +#define DUK_HCOMPFUNC_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HCOMPFUNC_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero,duk_hobject *) +#define DUK_HCOMPFUNC_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero_norz,duk_hobject *) +#define DUK_HNATFUNC_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HNATFUNC_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero,duk_hobject *) +#define DUK_HNATFUNC_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero_norz,duk_hobject *) +#define DUK_HBUFOBJ_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HBUFOBJ_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero,duk_hobject *) +#define DUK_HBUFOBJ_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero_norz,duk_hobject *) +#define DUK_HTHREAD_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HTHREAD_DECREF(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero,duk_hobject *) +#define DUK_HTHREAD_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_FAST_RAW((thr),(h),duk_hobject_refzero_norz,duk_hobject *) +#else +#define DUK_TVAL_INCREF(thr,tv) DUK_TVAL_INCREF_SLOW((thr),(tv)) +#define DUK_TVAL_DECREF(thr,tv) DUK_TVAL_DECREF_SLOW((thr),(tv)) +#define DUK_TVAL_DECREF_NORZ(thr,tv) DUK_TVAL_DECREF_NORZ_SLOW((thr),(tv)) +#define DUK_HEAPHDR_INCREF(thr,h) DUK_HEAPHDR_INCREF_SLOW((thr),(h)) +#define DUK_HEAPHDR_DECREF(thr,h) DUK_HEAPHDR_DECREF_SLOW((thr),(h)) +#define DUK_HEAPHDR_DECREF_NORZ(thr,h) DUK_HEAPHDR_DECREF_NORZ_SLOW((thr),(h)) +#define DUK_HSTRING_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) (h)) +#define DUK_HSTRING_DECREF(thr,h) DUK_HSTRING_DECREF_SLOW((thr),(h)) +#define DUK_HSTRING_DECREF_NORZ(thr,h) DUK_HSTRING_DECREF_NORZ_SLOW((thr),(h)) +#define DUK_HOBJECT_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) (h)) +#define DUK_HOBJECT_DECREF(thr,h) DUK_HOBJECT_DECREF_SLOW((thr),(h)) +#define DUK_HOBJECT_DECREF_NORZ(thr,h) DUK_HOBJECT_DECREF_NORZ_SLOW((thr),(h)) +#define DUK_HBUFFER_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) (h)) +#define DUK_HBUFFER_DECREF(thr,h) DUK_HBUFFER_DECREF_SLOW((thr),(h)) +#define DUK_HBUFFER_DECREF_NORZ(thr,h) DUK_HBUFFER_DECREF_NORZ_SLOW((thr),(h)) +#define DUK_HCOMPFUNC_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HCOMPFUNC_DECREF(thr,h) DUK_HOBJECT_DECREF_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HCOMPFUNC_DECREF_NORZ(thr,h) DUK_HOBJECT_DECREF_NORZ_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HNATFUNC_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HNATFUNC_DECREF(thr,h) DUK_HOBJECT_DECREF_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HNATFUNC_DECREF_NORZ(thr,h) DUK_HOBJECT_DECREF_NORZ_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HBUFOBJ_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HBUFOBJ_DECREF(thr,h) DUK_HOBJECT_DECREF_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HBUFOB_DECREF_NORZ(thr,h) DUK_HOBJECT_DECREF_NORZ_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HTHREAD_INCREF(thr,h) DUK_HEAPHDR_INCREF((thr),(duk_heaphdr *) &(h)->obj) +#define DUK_HTHREAD_DECREF(thr,h) DUK_HOBJECT_DECREF_SLOW((thr),(duk_hobject *) &(h)->obj) +#define DUK_HTHREAD_DECREF_NORZ(thr,h) DUK_HOBJECT_DECREF_NORZ_SLOW((thr),(duk_hobject *) &(h)->obj) +#endif + +/* Convenience for some situations; the above macros don't allow NULLs + * for performance reasons. Macros cover only actually needed cases. + */ +#define DUK_HEAPHDR_INCREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HEAPHDR_INCREF((thr), (duk_heaphdr *) (h)); \ + } \ + } while (0) +#define DUK_HEAPHDR_DECREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HEAPHDR_DECREF((thr), (duk_heaphdr *) (h)); \ + } \ + } while (0) +#define DUK_HEAPHDR_DECREF_NORZ_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HEAPHDR_DECREF_NORZ((thr), (duk_heaphdr *) (h)); \ + } \ + } while (0) +#define DUK_HOBJECT_INCREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HOBJECT_INCREF((thr), (h)); \ + } \ + } while (0) +#define DUK_HOBJECT_DECREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HOBJECT_DECREF((thr), (h)); \ + } \ + } while (0) +#define DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HOBJECT_DECREF_NORZ((thr), (h)); \ + } \ + } while (0) +#define DUK_HBUFFER_INCREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HBUFFER_INCREF((thr), (h)); \ + } \ + } while (0) +#define DUK_HBUFFER_DECREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HBUFFER_DECREF((thr), (h)); \ + } \ + } while (0) +#define DUK_HBUFFER_DECREF_NORZ_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HBUFFER_DECREF_NORZ((thr), (h)); \ + } \ + } while (0) +#define DUK_HTHREAD_INCREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HTHREAD_INCREF((thr), (h)); \ + } \ + } while (0) +#define DUK_HTHREAD_DECREF_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HTHREAD_DECREF((thr), (h)); \ + } \ + } while (0) +#define DUK_HTHREAD_DECREF_NORZ_ALLOWNULL(thr,h) do { \ + if ((h) != NULL) { \ + DUK_HTHREAD_DECREF_NORZ((thr), (h)); \ + } \ + } while (0) + +/* Called after one or more DECREF NORZ calls to handle pending side effects. + * At present DECREF NORZ does freeing inline but doesn't execute finalizers, + * so these macros check for pending finalizers and execute them. The FAST + * variant is performance critical. + */ +#if defined(DUK_USE_FINALIZER_SUPPORT) +#define DUK_REFZERO_CHECK_FAST(thr) do { \ + duk_refzero_check_fast((thr)); \ + } while (0) +#define DUK_REFZERO_CHECK_SLOW(thr) do { \ + duk_refzero_check_slow((thr)); \ + } while (0) +#else /* DUK_USE_FINALIZER_SUPPORT */ +#define DUK_REFZERO_CHECK_FAST(thr) do { } while (0) +#define DUK_REFZERO_CHECK_SLOW(thr) do { } while (0) +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +/* + * Macros to set a duk_tval and update refcount of the target (decref the + * old value and incref the new value if necessary). This is both performance + * and footprint critical; any changes made should be measured for size/speed. + */ + +#define DUK_TVAL_SET_UNDEFINED_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_UNDEFINED(tv__dst); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_UNDEFINED(tv__dst); \ + DUK_TVAL_DECREF_NORZ((thr), &tv__tmp); \ + } while (0) + +#define DUK_TVAL_SET_UNUSED_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_UNUSED(tv__dst); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_NULL_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_NULL(tv__dst); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_BOOLEAN_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_BOOLEAN(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_NUMBER_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_NUMBER(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#define DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_NUMBER_CHKFAST_FAST(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#define DUK_TVAL_SET_DOUBLE_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_DOUBLE(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#define DUK_TVAL_SET_NAN_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_NAN(tv__dst); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_SET_I48_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_I48(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#define DUK_TVAL_SET_I32_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_I32(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#define DUK_TVAL_SET_U32_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_U32(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) +#else +#define DUK_TVAL_SET_DOUBLE_CAST_UPDREF(thr,tvptr_dst,newval) \ + DUK_TVAL_SET_DOUBLE_UPDREF((thr), (tvptr_dst), (duk_double_t) (newval)) +#endif /* DUK_USE_FASTINT */ + +#define DUK_TVAL_SET_LIGHTFUNC_UPDREF_ALT0(thr,tvptr_dst,lf_v,lf_fp,lf_flags) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_LIGHTFUNC(tv__dst, (lf_v), (lf_fp), (lf_flags)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_STRING_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_STRING(tv__dst, (newval)); \ + DUK_HSTRING_INCREF((thr), (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_OBJECT_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_OBJECT(tv__dst, (newval)); \ + DUK_HOBJECT_INCREF((thr), (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_BUFFER_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_BUFFER(tv__dst, (newval)); \ + DUK_HBUFFER_INCREF((thr), (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +#define DUK_TVAL_SET_POINTER_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; duk_tval tv__tmp; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_POINTER(tv__dst, (newval)); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +/* DUK_TVAL_SET_TVAL_UPDREF() is used a lot in executor, property lookups, + * etc, so it's very important for performance. Measure when changing. + * + * NOTE: the source and destination duk_tval pointers may be the same, and + * the macros MUST deal with that correctly. + */ + +/* Original idiom used, minimal code size. */ +#define DUK_TVAL_SET_TVAL_UPDREF_ALT0(thr,tvptr_dst,tvptr_src) do { \ + duk_tval *tv__dst, *tv__src; duk_tval tv__tmp; \ + tv__dst = (tvptr_dst); tv__src = (tvptr_src); \ + DUK_TVAL_SET_TVAL(&tv__tmp, tv__dst); \ + DUK_TVAL_SET_TVAL(tv__dst, tv__src); \ + DUK_TVAL_INCREF((thr), tv__src); \ + DUK_TVAL_DECREF((thr), &tv__tmp); /* side effects */ \ + } while (0) + +/* Faster alternative: avoid making a temporary copy of tvptr_dst and use + * fast incref/decref macros. + */ +#define DUK_TVAL_SET_TVAL_UPDREF_ALT1(thr,tvptr_dst,tvptr_src) do { \ + duk_tval *tv__dst, *tv__src; duk_heaphdr *h__obj; \ + tv__dst = (tvptr_dst); tv__src = (tvptr_src); \ + DUK_TVAL_INCREF_FAST((thr), tv__src); \ + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv__dst)) { \ + h__obj = DUK_TVAL_GET_HEAPHDR(tv__dst); \ + DUK_ASSERT(h__obj != NULL); \ + DUK_TVAL_SET_TVAL(tv__dst, tv__src); \ + DUK_HEAPHDR_DECREF_FAST((thr), h__obj); /* side effects */ \ + } else { \ + DUK_TVAL_SET_TVAL(tv__dst, tv__src); \ + } \ + } while (0) + +/* XXX: no optimized variants yet */ +#define DUK_TVAL_SET_UNDEFINED_UPDREF DUK_TVAL_SET_UNDEFINED_UPDREF_ALT0 +#define DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ_ALT0 +#define DUK_TVAL_SET_UNUSED_UPDREF DUK_TVAL_SET_UNUSED_UPDREF_ALT0 +#define DUK_TVAL_SET_NULL_UPDREF DUK_TVAL_SET_NULL_UPDREF_ALT0 +#define DUK_TVAL_SET_BOOLEAN_UPDREF DUK_TVAL_SET_BOOLEAN_UPDREF_ALT0 +#define DUK_TVAL_SET_NUMBER_UPDREF DUK_TVAL_SET_NUMBER_UPDREF_ALT0 +#define DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF_ALT0 +#define DUK_TVAL_SET_DOUBLE_UPDREF DUK_TVAL_SET_DOUBLE_UPDREF_ALT0 +#define DUK_TVAL_SET_NAN_UPDREF DUK_TVAL_SET_NAN_UPDREF_ALT0 +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_SET_I48_UPDREF DUK_TVAL_SET_I48_UPDREF_ALT0 +#define DUK_TVAL_SET_I32_UPDREF DUK_TVAL_SET_I32_UPDREF_ALT0 +#define DUK_TVAL_SET_U32_UPDREF DUK_TVAL_SET_U32_UPDREF_ALT0 +#else +#define DUK_TVAL_SET_I48_UPDREF DUK_TVAL_SET_DOUBLE_CAST_UPDREF /* XXX: fast int-to-double */ +#define DUK_TVAL_SET_I32_UPDREF DUK_TVAL_SET_DOUBLE_CAST_UPDREF +#define DUK_TVAL_SET_U32_UPDREF DUK_TVAL_SET_DOUBLE_CAST_UPDREF +#endif /* DUK_USE_FASTINT */ +#define DUK_TVAL_SET_FASTINT_UPDREF DUK_TVAL_SET_I48_UPDREF /* convenience */ +#define DUK_TVAL_SET_LIGHTFUNC_UPDREF DUK_TVAL_SET_LIGHTFUNC_UPDREF_ALT0 +#define DUK_TVAL_SET_STRING_UPDREF DUK_TVAL_SET_STRING_UPDREF_ALT0 +#define DUK_TVAL_SET_OBJECT_UPDREF DUK_TVAL_SET_OBJECT_UPDREF_ALT0 +#define DUK_TVAL_SET_BUFFER_UPDREF DUK_TVAL_SET_BUFFER_UPDREF_ALT0 +#define DUK_TVAL_SET_POINTER_UPDREF DUK_TVAL_SET_POINTER_UPDREF_ALT0 + +#if defined(DUK_USE_FAST_REFCOUNT_DEFAULT) +/* Optimized for speed. */ +#define DUK_TVAL_SET_TVAL_UPDREF DUK_TVAL_SET_TVAL_UPDREF_ALT1 +#define DUK_TVAL_SET_TVAL_UPDREF_FAST DUK_TVAL_SET_TVAL_UPDREF_ALT1 +#define DUK_TVAL_SET_TVAL_UPDREF_SLOW DUK_TVAL_SET_TVAL_UPDREF_ALT0 +#else +/* Optimized for size. */ +#define DUK_TVAL_SET_TVAL_UPDREF DUK_TVAL_SET_TVAL_UPDREF_ALT0 +#define DUK_TVAL_SET_TVAL_UPDREF_FAST DUK_TVAL_SET_TVAL_UPDREF_ALT0 +#define DUK_TVAL_SET_TVAL_UPDREF_SLOW DUK_TVAL_SET_TVAL_UPDREF_ALT0 +#endif + +#else /* DUK_USE_REFERENCE_COUNTING */ + +#define DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv) 0 +#define DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE(h) 0 + +#define DUK_TVAL_INCREF_FAST(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_DECREF_FAST(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_DECREF_NORZ_FAST(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_INCREF_SLOW(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_DECREF_SLOW(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_DECREF_NORZ_SLOW(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_INCREF(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_DECREF(thr,v) do {} while (0) /* nop */ +#define DUK_TVAL_DECREF_NORZ(thr,v) do {} while (0) /* nop */ +#define DUK_HEAPHDR_INCREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_DECREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_DECREF_NORZ_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_INCREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_DECREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_DECREF_NORZ_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HEAPHDR_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_INCREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_DECREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_DECREF_NORZ_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_INCREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_DECREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_DECREF_NORZ_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HSTRING_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_INCREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_NORZ_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_INCREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_NORZ_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_INCREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_NORZ_FAST(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_INCREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_NORZ_SLOW(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_NORZ(thr,h) do {} while (0) /* nop */ + +#define DUK_HCOMPFUNC_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HCOMPFUNC_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HCOMPFUNC_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HNATFUNC_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HNATFUNC_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HNATFUNC_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFOBJ_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFOBJ_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFOBJ_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HTHREAD_INCREF(thr,h) do {} while (0) /* nop */ +#define DUK_HTHREAD_DECREF(thr,h) do {} while (0) /* nop */ +#define DUK_HTHREAD_DECREF_NORZ(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_INCREF_ALLOWNULL(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_ALLOWNULL(thr,h) do {} while (0) /* nop */ +#define DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_INCREF_ALLOWNULL(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_ALLOWNULL(thr,h) do {} while (0) /* nop */ +#define DUK_HBUFFER_DECREF_NORZ_ALLOWNULL(thr,h) do {} while (0) /* nop */ + +#define DUK_REFZERO_CHECK_FAST(thr) do {} while (0) /* nop */ +#define DUK_REFZERO_CHECK_SLOW(thr) do {} while (0) /* nop */ + +#define DUK_TVAL_SET_UNDEFINED_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_UNDEFINED(tv__dst); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_UNUSED_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_UNUSED(tv__dst); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_NULL_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_NULL(tv__dst); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_BOOLEAN_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_BOOLEAN(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_NUMBER_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_NUMBER(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) +#define DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_NUMBER_CHKFAST_FAST(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) +#define DUK_TVAL_SET_DOUBLE_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_DOUBLE(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) +#define DUK_TVAL_SET_NAN_UPDREF_ALT0(thr,tvptr_dst) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_NAN(tv__dst); \ + DUK_UNREF((thr)); \ + } while (0) +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_SET_I48_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_I48(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) +#define DUK_TVAL_SET_I32_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_I32(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) +#define DUK_TVAL_SET_U32_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_U32(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) +#else +#define DUK_TVAL_SET_DOUBLE_CAST_UPDREF(thr,tvptr_dst,newval) \ + DUK_TVAL_SET_DOUBLE_UPDREF((thr), (tvptr_dst), (duk_double_t) (newval)) +#endif /* DUK_USE_FASTINT */ + +#define DUK_TVAL_SET_LIGHTFUNC_UPDREF_ALT0(thr,tvptr_dst,lf_v,lf_fp,lf_flags) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_LIGHTFUNC(tv__dst, (lf_v), (lf_fp), (lf_flags)); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_STRING_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_STRING(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_OBJECT_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_OBJECT(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_BUFFER_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_BUFFER(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_POINTER_UPDREF_ALT0(thr,tvptr_dst,newval) do { \ + duk_tval *tv__dst; tv__dst = (tvptr_dst); \ + DUK_TVAL_SET_POINTER(tv__dst, (newval)); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_TVAL_UPDREF_ALT0(thr,tvptr_dst,tvptr_src) do { \ + duk_tval *tv__dst, *tv__src; \ + tv__dst = (tvptr_dst); tv__src = (tvptr_src); \ + DUK_TVAL_SET_TVAL(tv__dst, tv__src); \ + DUK_UNREF((thr)); \ + } while (0) + +#define DUK_TVAL_SET_UNDEFINED_UPDREF DUK_TVAL_SET_UNDEFINED_UPDREF_ALT0 +#define DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ DUK_TVAL_SET_UNDEFINED_UPDREF_ALT0 +#define DUK_TVAL_SET_UNUSED_UPDREF DUK_TVAL_SET_UNUSED_UPDREF_ALT0 +#define DUK_TVAL_SET_NULL_UPDREF DUK_TVAL_SET_NULL_UPDREF_ALT0 +#define DUK_TVAL_SET_BOOLEAN_UPDREF DUK_TVAL_SET_BOOLEAN_UPDREF_ALT0 +#define DUK_TVAL_SET_NUMBER_UPDREF DUK_TVAL_SET_NUMBER_UPDREF_ALT0 +#define DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF_ALT0 +#define DUK_TVAL_SET_DOUBLE_UPDREF DUK_TVAL_SET_DOUBLE_UPDREF_ALT0 +#define DUK_TVAL_SET_NAN_UPDREF DUK_TVAL_SET_NAN_UPDREF_ALT0 +#if defined(DUK_USE_FASTINT) +#define DUK_TVAL_SET_I48_UPDREF DUK_TVAL_SET_I48_UPDREF_ALT0 +#define DUK_TVAL_SET_I32_UPDREF DUK_TVAL_SET_I32_UPDREF_ALT0 +#define DUK_TVAL_SET_U32_UPDREF DUK_TVAL_SET_U32_UPDREF_ALT0 +#else +#define DUK_TVAL_SET_I48_UPDREF DUK_TVAL_SET_DOUBLE_CAST_UPDREF /* XXX: fast-int-to-double */ +#define DUK_TVAL_SET_I32_UPDREF DUK_TVAL_SET_DOUBLE_CAST_UPDREF +#define DUK_TVAL_SET_U32_UPDREF DUK_TVAL_SET_DOUBLE_CAST_UPDREF +#endif /* DUK_USE_FASTINT */ +#define DUK_TVAL_SET_FASTINT_UPDREF DUK_TVAL_SET_I48_UPDREF /* convenience */ +#define DUK_TVAL_SET_LIGHTFUNC_UPDREF DUK_TVAL_SET_LIGHTFUNC_UPDREF_ALT0 +#define DUK_TVAL_SET_STRING_UPDREF DUK_TVAL_SET_STRING_UPDREF_ALT0 +#define DUK_TVAL_SET_OBJECT_UPDREF DUK_TVAL_SET_OBJECT_UPDREF_ALT0 +#define DUK_TVAL_SET_BUFFER_UPDREF DUK_TVAL_SET_BUFFER_UPDREF_ALT0 +#define DUK_TVAL_SET_POINTER_UPDREF DUK_TVAL_SET_POINTER_UPDREF_ALT0 + +#define DUK_TVAL_SET_TVAL_UPDREF DUK_TVAL_SET_TVAL_UPDREF_ALT0 +#define DUK_TVAL_SET_TVAL_UPDREF_FAST DUK_TVAL_SET_TVAL_UPDREF_ALT0 +#define DUK_TVAL_SET_TVAL_UPDREF_SLOW DUK_TVAL_SET_TVAL_UPDREF_ALT0 + +#endif /* DUK_USE_REFERENCE_COUNTING */ + +/* + * Some convenience macros that don't have optimized implementations now. + */ + +#define DUK_TVAL_SET_TVAL_UPDREF_NORZ(thr,tv_dst,tv_src) do { \ + duk_hthread *duk__thr = (thr); \ + duk_tval *duk__dst = (tv_dst); \ + duk_tval *duk__src = (tv_src); \ + DUK_UNREF(duk__thr); \ + DUK_TVAL_DECREF_NORZ(thr, duk__dst); \ + DUK_TVAL_SET_TVAL(duk__dst, duk__src); \ + DUK_TVAL_INCREF(thr, duk__dst); \ + } while (0) + +#define DUK_TVAL_SET_U32_UPDREF_NORZ(thr,tv_dst,val) do { \ + duk_hthread *duk__thr = (thr); \ + duk_tval *duk__dst = (tv_dst); \ + duk_uint32_t duk__val = (duk_uint32_t) (val); \ + DUK_UNREF(duk__thr); \ + DUK_TVAL_DECREF_NORZ(thr, duk__dst); \ + DUK_TVAL_SET_U32(duk__dst, duk__val); \ + } while (0) + +/* + * Prototypes + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL_DECL void duk_refzero_check_slow(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_refzero_check_fast(duk_hthread *thr); +#endif +DUK_INTERNAL_DECL void duk_heaphdr_refcount_finalize_norz(duk_heap *heap, duk_heaphdr *hdr); +DUK_INTERNAL_DECL void duk_hobject_refcount_finalize_norz(duk_heap *heap, duk_hobject *h); +#if 0 /* Not needed: fast path handles inline; slow path uses duk_heaphdr_decref() which is needed anyway. */ +DUK_INTERNAL_DECL void duk_hstring_decref(duk_hthread *thr, duk_hstring *h); +DUK_INTERNAL_DECL void duk_hstring_decref_norz(duk_hthread *thr, duk_hstring *h); +DUK_INTERNAL_DECL void duk_hbuffer_decref(duk_hthread *thr, duk_hbuffer *h); +DUK_INTERNAL_DECL void duk_hbuffer_decref_norz(duk_hthread *thr, duk_hbuffer *h); +DUK_INTERNAL_DECL void duk_hobject_decref(duk_hthread *thr, duk_hobject *h); +DUK_INTERNAL_DECL void duk_hobject_decref_norz(duk_hthread *thr, duk_hobject *h); +#endif +DUK_INTERNAL_DECL void duk_heaphdr_refzero(duk_hthread *thr, duk_heaphdr *h); +DUK_INTERNAL_DECL void duk_heaphdr_refzero_norz(duk_hthread *thr, duk_heaphdr *h); +#if defined(DUK_USE_FAST_REFCOUNT_DEFAULT) +DUK_INTERNAL_DECL void duk_hstring_refzero(duk_hthread *thr, duk_hstring *h); /* no 'norz' variant */ +DUK_INTERNAL_DECL void duk_hbuffer_refzero(duk_hthread *thr, duk_hbuffer *h); /* no 'norz' variant */ +DUK_INTERNAL_DECL void duk_hobject_refzero(duk_hthread *thr, duk_hobject *h); +DUK_INTERNAL_DECL void duk_hobject_refzero_norz(duk_hthread *thr, duk_hobject *h); +#else +DUK_INTERNAL_DECL void duk_tval_incref(duk_tval *tv); +DUK_INTERNAL_DECL void duk_tval_decref(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL void duk_tval_decref_norz(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL void duk_heaphdr_incref(duk_heaphdr *h); +DUK_INTERNAL_DECL void duk_heaphdr_decref(duk_hthread *thr, duk_heaphdr *h); +DUK_INTERNAL_DECL void duk_heaphdr_decref_norz(duk_hthread *thr, duk_heaphdr *h); +#endif +#else /* DUK_USE_REFERENCE_COUNTING */ +/* no refcounting */ +#endif /* DUK_USE_REFERENCE_COUNTING */ + +#endif /* DUK_REFCOUNT_H_INCLUDED */ +/* #include duk_api_internal.h */ +#line 1 "duk_api_internal.h" +/* + * Internal API calls which have (stack and other) semantics similar + * to the public API. + */ + +#if !defined(DUK_API_INTERNAL_H_INCLUDED) +#define DUK_API_INTERNAL_H_INCLUDED + +#define DUK_INTERNAL_SYMBOL(x) ("\x82" x) + +/* duk_push_sprintf constants */ +#define DUK_PUSH_SPRINTF_INITIAL_SIZE 256L +#define DUK_PUSH_SPRINTF_SANITY_LIMIT (1L * 1024L * 1024L * 1024L) + +/* Flag ORed to err_code to indicate __FILE__ / __LINE__ is not + * blamed as source of error for error fileName / lineNumber. + */ +#define DUK_ERRCODE_FLAG_NOBLAME_FILELINE (1L << 24) + +/* Current convention is to use duk_size_t for value stack sizes and global indices, + * and duk_idx_t for local frame indices. + */ +DUK_INTERNAL_DECL void duk_valstack_grow_check_throw(duk_hthread *thr, duk_size_t min_bytes); +DUK_INTERNAL_DECL duk_bool_t duk_valstack_grow_check_nothrow(duk_hthread *thr, duk_size_t min_bytes); +DUK_INTERNAL_DECL void duk_valstack_shrink_check_nothrow(duk_hthread *thr, duk_bool_t snug); + +DUK_INTERNAL_DECL void duk_copy_tvals_incref(duk_hthread *thr, duk_tval *tv_dst, duk_tval *tv_src, duk_size_t count); + +DUK_INTERNAL_DECL duk_tval *duk_reserve_gap(duk_hthread *thr, duk_idx_t idx_base, duk_idx_t count); + +DUK_INTERNAL_DECL void duk_set_top_unsafe(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL void duk_set_top_and_wipe(duk_hthread *thr, duk_idx_t top, duk_idx_t idx_wipe_start); + +DUK_INTERNAL_DECL void duk_dup_0(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_dup_1(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_dup_2(duk_hthread *thr); +/* duk_dup_m1() would be same as duk_dup_top() */ +DUK_INTERNAL_DECL void duk_dup_m2(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_dup_m3(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_dup_m4(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_remove_unsafe(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL void duk_remove_m2(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_remove_n(duk_hthread *thr, duk_idx_t idx, duk_idx_t count); +DUK_INTERNAL_DECL void duk_remove_n_unsafe(duk_hthread *thr, duk_idx_t idx, duk_idx_t count); + +DUK_INTERNAL_DECL duk_int_t duk_get_type_tval(duk_tval *tv); +DUK_INTERNAL_DECL duk_uint_t duk_get_type_mask_tval(duk_tval *tv); + +#if defined(DUK_USE_VERBOSE_ERRORS) && defined(DUK_USE_PARANOID_ERRORS) +DUK_INTERNAL_DECL const char *duk_get_type_name(duk_hthread *thr, duk_idx_t idx); +#endif +DUK_INTERNAL_DECL duk_small_uint_t duk_get_class_number(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_tval *duk_get_tval(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_tval *duk_get_tval_or_unused(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_tval *duk_require_tval(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL void duk_push_tval(duk_hthread *thr, duk_tval *tv); + +/* Push the current 'this' binding; throw TypeError if binding is not object + * coercible (CheckObjectCoercible). + */ +DUK_INTERNAL_DECL void duk_push_this_check_object_coercible(duk_hthread *thr); + +/* duk_push_this() + CheckObjectCoercible() + duk_to_object() */ +DUK_INTERNAL_DECL duk_hobject *duk_push_this_coercible_to_object(duk_hthread *thr); + +/* duk_push_this() + CheckObjectCoercible() + duk_to_string() */ +DUK_INTERNAL_DECL duk_hstring *duk_push_this_coercible_to_string(duk_hthread *thr); + +DUK_INTERNAL_DECL duk_hstring *duk_push_uint_to_hstring(duk_hthread *thr, duk_uint_t i); + +/* Get a borrowed duk_tval pointer to the current 'this' binding. Caller must + * make sure there's an active callstack entry. Note that the returned pointer + * is unstable with regards to side effects. + */ +DUK_INTERNAL_DECL duk_tval *duk_get_borrowed_this_tval(duk_hthread *thr); + +/* XXX: add fastint support? */ +#define duk_push_u64(thr,val) \ + duk_push_number((thr), (duk_double_t) (val)) +#define duk_push_i64(thr,val) \ + duk_push_number((thr), (duk_double_t) (val)) + +/* duk_push_(u)int() is guaranteed to support at least (un)signed 32-bit range */ +#define duk_push_u32(thr,val) \ + duk_push_uint((thr), (duk_uint_t) (val)) +#define duk_push_i32(thr,val) \ + duk_push_int((thr), (duk_int_t) (val)) + +/* sometimes stack and array indices need to go on the stack */ +#define duk_push_idx(thr,val) \ + duk_push_int((thr), (duk_int_t) (val)) +#define duk_push_uarridx(thr,val) \ + duk_push_uint((thr), (duk_uint_t) (val)) +#define duk_push_size_t(thr,val) \ + duk_push_uint((thr), (duk_uint_t) (val)) /* XXX: assumed to fit for now */ + +DUK_INTERNAL_DECL duk_bool_t duk_is_string_notsymbol(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_bool_t duk_is_callable_tval(duk_hthread *thr, duk_tval *tv); + +DUK_INTERNAL_DECL duk_hstring *duk_get_hstring(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hstring *duk_get_hstring_notsymbol(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL const char *duk_get_string_notsymbol(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hobject *duk_get_hobject(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hbuffer *duk_get_hbuffer(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hthread *duk_get_hthread(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hcompfunc *duk_get_hcompfunc(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hnatfunc *duk_get_hnatfunc(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL void *duk_get_buffer_data_raw(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_len, duk_bool_t throw_flag, duk_bool_t *out_isbuffer); + +DUK_INTERNAL_DECL duk_hobject *duk_get_hobject_with_class(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t classnum); + +DUK_INTERNAL_DECL duk_hobject *duk_get_hobject_promote_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask); +DUK_INTERNAL_DECL duk_hobject *duk_require_hobject_promote_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask); +DUK_INTERNAL_DECL duk_hobject *duk_require_hobject_accept_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask); +#define duk_require_hobject_promote_lfunc(thr,idx) \ + duk_require_hobject_promote_mask((thr), (idx), DUK_TYPE_MASK_LIGHTFUNC) +#define duk_get_hobject_promote_lfunc(thr,idx) \ + duk_get_hobject_promote_mask((thr), (idx), DUK_TYPE_MASK_LIGHTFUNC) + +#if 0 /*unused*/ +DUK_INTERNAL_DECL void *duk_get_voidptr(duk_hthread *thr, duk_idx_t idx); +#endif + +DUK_INTERNAL_DECL duk_hstring *duk_known_hstring(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hobject *duk_known_hobject(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hbuffer *duk_known_hbuffer(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hcompfunc *duk_known_hcompfunc(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hnatfunc *duk_known_hnatfunc(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_double_t duk_to_number_tval(duk_hthread *thr, duk_tval *tv); + +DUK_INTERNAL_DECL duk_hstring *duk_to_hstring(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hstring *duk_to_hstring_m1(duk_hthread *thr); +DUK_INTERNAL_DECL duk_hstring *duk_to_hstring_acceptsymbol(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_hobject *duk_to_hobject(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_double_t duk_to_number_m1(duk_hthread *thr); +DUK_INTERNAL_DECL duk_double_t duk_to_number_m2(duk_hthread *thr); + +DUK_INTERNAL_DECL duk_bool_t duk_to_boolean_top_pop(duk_hthread *thr); + +#if defined(DUK_USE_DEBUGGER_SUPPORT) /* only needed by debugger for now */ +DUK_INTERNAL_DECL duk_hstring *duk_safe_to_hstring(duk_hthread *thr, duk_idx_t idx); +#endif +DUK_INTERNAL_DECL void duk_push_class_string_tval(duk_hthread *thr, duk_tval *tv, duk_bool_t avoid_side_effects); + +DUK_INTERNAL_DECL duk_int_t duk_to_int_clamped_raw(duk_hthread *thr, duk_idx_t idx, duk_int_t minval, duk_int_t maxval, duk_bool_t *out_clamped); /* out_clamped=NULL, RangeError if outside range */ +DUK_INTERNAL_DECL duk_int_t duk_to_int_clamped(duk_hthread *thr, duk_idx_t idx, duk_int_t minval, duk_int_t maxval); +DUK_INTERNAL_DECL duk_int_t duk_to_int_check_range(duk_hthread *thr, duk_idx_t idx, duk_int_t minval, duk_int_t maxval); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL_DECL duk_uint8_t duk_to_uint8clamped(duk_hthread *thr, duk_idx_t idx); +#endif +DUK_INTERNAL_DECL duk_hstring *duk_to_property_key_hstring(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_hstring *duk_require_hstring(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hstring *duk_require_hstring_notsymbol(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL const char *duk_require_lstring_notsymbol(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len); +DUK_INTERNAL_DECL const char *duk_require_string_notsymbol(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hobject *duk_require_hobject(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hbuffer *duk_require_hbuffer(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hthread *duk_require_hthread(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hcompfunc *duk_require_hcompfunc(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL duk_hnatfunc *duk_require_hnatfunc(duk_hthread *thr, duk_idx_t idx); + +DUK_INTERNAL_DECL duk_hobject *duk_require_hobject_with_class(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t classnum); + +DUK_INTERNAL_DECL void duk_push_hstring(duk_hthread *thr, duk_hstring *h); +DUK_INTERNAL_DECL void duk_push_hstring_stridx(duk_hthread *thr, duk_small_uint_t stridx); +DUK_INTERNAL_DECL void duk_push_hstring_empty(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_push_hobject(duk_hthread *thr, duk_hobject *h); +DUK_INTERNAL_DECL void duk_push_hbuffer(duk_hthread *thr, duk_hbuffer *h); +#define duk_push_hthread(thr,h) \ + duk_push_hobject((thr), (duk_hobject *) (h)) +#define duk_push_hnatfunc(thr,h) \ + duk_push_hobject((thr), (duk_hobject *) (h)) +DUK_INTERNAL_DECL void duk_push_hobject_bidx(duk_hthread *thr, duk_small_int_t builtin_idx); +DUK_INTERNAL_DECL duk_hobject *duk_push_object_helper(duk_hthread *thr, duk_uint_t hobject_flags_and_class, duk_small_int_t prototype_bidx); +DUK_INTERNAL_DECL duk_hobject *duk_push_object_helper_proto(duk_hthread *thr, duk_uint_t hobject_flags_and_class, duk_hobject *proto); +DUK_INTERNAL_DECL duk_hcompfunc *duk_push_hcompfunc(duk_hthread *thr); +DUK_INTERNAL_DECL duk_hboundfunc *duk_push_hboundfunc(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_push_c_function_builtin(duk_hthread *thr, duk_c_function func, duk_int_t nargs); +DUK_INTERNAL_DECL void duk_push_c_function_builtin_noconstruct(duk_hthread *thr, duk_c_function func, duk_int_t nargs); + +/* XXX: duk_push_harray() and duk_push_hcompfunc() are inconsistent with + * duk_push_hobject() etc which don't create a new value. + */ +DUK_INTERNAL_DECL duk_harray *duk_push_harray(duk_hthread *thr); +DUK_INTERNAL_DECL duk_harray *duk_push_harray_with_size(duk_hthread *thr, duk_uint32_t size); +DUK_INTERNAL_DECL duk_tval *duk_push_harray_with_size_outptr(duk_hthread *thr, duk_uint32_t size); + +DUK_INTERNAL_DECL void duk_push_string_funcptr(duk_hthread *thr, duk_uint8_t *ptr, duk_size_t sz); +DUK_INTERNAL_DECL void duk_push_lightfunc_name_raw(duk_hthread *thr, duk_c_function func, duk_small_uint_t lf_flags); +DUK_INTERNAL_DECL void duk_push_lightfunc_name(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL void duk_push_lightfunc_tostring(duk_hthread *thr, duk_tval *tv); +#if 0 /* not used yet */ +DUK_INTERNAL_DECL void duk_push_hnatfunc_name(duk_hthread *thr, duk_hnatfunc *h); +#endif +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL_DECL duk_hbufobj *duk_push_bufobj_raw(duk_hthread *thr, duk_uint_t hobject_flags_and_class, duk_small_int_t prototype_bidx); +#endif + +DUK_INTERNAL_DECL void *duk_push_fixed_buffer_nozero(duk_hthread *thr, duk_size_t len); +DUK_INTERNAL_DECL void *duk_push_fixed_buffer_zero(duk_hthread *thr, duk_size_t len); + +DUK_INTERNAL_DECL const char *duk_push_string_readable(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL const char *duk_push_string_tval_readable(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL const char *duk_push_string_tval_readable_error(duk_hthread *thr, duk_tval *tv); + +/* The duk_xxx_prop_stridx_short() variants expect their arguments to be short + * enough to be packed into a single 32-bit integer argument. Argument limits + * vary per call; typically 16 bits are assigned to the signed value stack index + * and the stridx. In practice these work well for footprint with constant + * arguments and such call sites are also easiest to verify to be correct. + */ + +DUK_INTERNAL_DECL duk_bool_t duk_get_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx); /* [] -> [val] */ +DUK_INTERNAL_DECL duk_bool_t duk_get_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args); +#define duk_get_prop_stridx_short(thr,obj_idx,stridx) \ + (DUK_ASSERT_EXPR((duk_int_t) (obj_idx) >= -0x8000L && (duk_int_t) (obj_idx) <= 0x7fffL), \ + DUK_ASSERT_EXPR((duk_int_t) (stridx) >= 0 && (duk_int_t) (stridx) <= 0xffffL), \ + duk_get_prop_stridx_short_raw((thr), (((duk_uint_t) (obj_idx)) << 16) + ((duk_uint_t) (stridx)))) +DUK_INTERNAL_DECL duk_bool_t duk_get_prop_stridx_boolean(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_bool_t *out_has_prop); /* [] -> [] */ + +DUK_INTERNAL_DECL duk_bool_t duk_put_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx); /* [val] -> [] */ +DUK_INTERNAL_DECL duk_bool_t duk_put_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args); +#define duk_put_prop_stridx_short(thr,obj_idx,stridx) \ + (DUK_ASSERT_EXPR((duk_int_t) (obj_idx) >= -0x8000L && (duk_int_t) (obj_idx) <= 0x7fffL), \ + DUK_ASSERT_EXPR((duk_int_t) (stridx) >= 0 && (duk_int_t) (stridx) <= 0xffffL), \ + duk_put_prop_stridx_short_raw((thr), (((duk_uint_t) (obj_idx)) << 16) + ((duk_uint_t) (stridx)))) + +DUK_INTERNAL_DECL duk_bool_t duk_del_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx); /* [] -> [] */ +#if 0 /* Too few call sites to be useful. */ +DUK_INTERNAL_DECL duk_bool_t duk_del_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args); +#define duk_del_prop_stridx_short(thr,obj_idx,stridx) \ + (DUK_ASSERT_EXPR((obj_idx) >= -0x8000L && (obj_idx) <= 0x7fffL), \ + DUK_ASSERT_EXPR((stridx) >= 0 && (stridx) <= 0xffffL), \ + duk_del_prop_stridx_short_raw((thr), (((duk_uint_t) (obj_idx)) << 16) + ((duk_uint_t) (stridx)))) +#endif +#define duk_del_prop_stridx_short(thr,obj_idx,stridx) \ + duk_del_prop_stridx((thr), (obj_idx), (stridx)) + +DUK_INTERNAL_DECL duk_bool_t duk_has_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx); /* [] -> [] */ +#if 0 /* Too few call sites to be useful. */ +DUK_INTERNAL_DECL duk_bool_t duk_has_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args); +#define duk_has_prop_stridx_short(thr,obj_idx,stridx) \ + (DUK_ASSERT_EXPR((obj_idx) >= -0x8000L && (obj_idx) <= 0x7fffL), \ + DUK_ASSERT_EXPR((stridx) >= 0 && (stridx) <= 0xffffL), \ + duk_has_prop_stridx_short_raw((thr), (((duk_uint_t) (obj_idx)) << 16) + ((duk_uint_t) (stridx)))) +#endif +#define duk_has_prop_stridx_short(thr,obj_idx,stridx) \ + duk_has_prop_stridx((thr), (obj_idx), (stridx)) + +DUK_INTERNAL_DECL void duk_xdef_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t desc_flags); /* [key val] -> [] */ + +DUK_INTERNAL_DECL void duk_xdef_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx, duk_small_uint_t desc_flags); /* [val] -> [] */ + +/* XXX: Because stridx and desc_flags have a limited range, this call could + * always pack stridx and desc_flags into a single argument. + */ +DUK_INTERNAL_DECL void duk_xdef_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_small_uint_t desc_flags); /* [val] -> [] */ +DUK_INTERNAL_DECL void duk_xdef_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args); +#define duk_xdef_prop_stridx_short(thr,obj_idx,stridx,desc_flags) \ + (DUK_ASSERT_EXPR((duk_int_t) (obj_idx) >= -0x80L && (duk_int_t) (obj_idx) <= 0x7fL), \ + DUK_ASSERT_EXPR((duk_int_t) (stridx) >= 0 && (duk_int_t) (stridx) <= 0xffffL), \ + DUK_ASSERT_EXPR((duk_int_t) (desc_flags) >= 0 && (duk_int_t) (desc_flags) <= 0xffL), \ + duk_xdef_prop_stridx_short_raw((thr), (((duk_uint_t) (obj_idx)) << 24) + (((duk_uint_t) (stridx)) << 8) + (duk_uint_t) (desc_flags))) + +#define duk_xdef_prop_wec(thr,obj_idx) \ + duk_xdef_prop((thr), (obj_idx), DUK_PROPDESC_FLAGS_WEC) +#define duk_xdef_prop_index_wec(thr,obj_idx,arr_idx) \ + duk_xdef_prop_index((thr), (obj_idx), (arr_idx), DUK_PROPDESC_FLAGS_WEC) +#define duk_xdef_prop_stridx_wec(thr,obj_idx,stridx) \ + duk_xdef_prop_stridx((thr), (obj_idx), (stridx), DUK_PROPDESC_FLAGS_WEC) +#define duk_xdef_prop_stridx_short_wec(thr,obj_idx,stridx) \ + duk_xdef_prop_stridx_short((thr), (obj_idx), (stridx), DUK_PROPDESC_FLAGS_WEC) + +#if 0 /*unused*/ +DUK_INTERNAL_DECL void duk_xdef_prop_stridx_builtin(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_small_int_t builtin_idx, duk_small_uint_t desc_flags); /* [] -> [] */ +#endif + +DUK_INTERNAL_DECL void duk_xdef_prop_stridx_thrower(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx); /* [] -> [] */ + +DUK_INTERNAL_DECL duk_bool_t duk_get_method_stridx(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t stridx); + +DUK_INTERNAL_DECL void duk_pack(duk_hthread *thr, duk_idx_t count); +DUK_INTERNAL_DECL duk_idx_t duk_unpack_array_like(duk_hthread *thr, duk_idx_t idx); +#if 0 +DUK_INTERNAL_DECL void duk_unpack(duk_hthread *thr); +#endif + +DUK_INTERNAL_DECL void duk_require_constructor_call(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_require_constructable(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL void duk_push_symbol_descriptive_string(duk_hthread *thr, duk_hstring *h); + +DUK_INTERNAL_DECL void duk_resolve_nonbound_function(duk_hthread *thr); + +DUK_INTERNAL_DECL duk_idx_t duk_get_top_require_min(duk_hthread *thr, duk_idx_t min_top); +DUK_INTERNAL_DECL duk_idx_t duk_get_top_index_unsafe(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_pop_n_unsafe(duk_hthread *thr, duk_idx_t count); +DUK_INTERNAL_DECL void duk_pop_unsafe(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_pop_2_unsafe(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_pop_3_unsafe(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_pop_n_nodecref_unsafe(duk_hthread *thr, duk_idx_t count); +DUK_INTERNAL_DECL void duk_pop_nodecref_unsafe(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_pop_2_nodecref_unsafe(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_pop_3_nodecref_unsafe(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_pop_undefined(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_compact_m1(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_seal_freeze_raw(duk_hthread *thr, duk_idx_t obj_idx, duk_bool_t is_freeze); + +DUK_INTERNAL_DECL void duk_insert_undefined(duk_hthread *thr, duk_idx_t idx); +DUK_INTERNAL_DECL void duk_insert_undefined_n(duk_hthread *thr, duk_idx_t idx, duk_idx_t count); + +DUK_INTERNAL_DECL void duk_concat_2(duk_hthread *thr); + +DUK_INTERNAL_DECL duk_int_t duk_pcall_method_flags(duk_hthread *thr, duk_idx_t nargs, duk_small_uint_t call_flags); + +#if defined(DUK_USE_SYMBOL_BUILTIN) +DUK_INTERNAL_DECL void duk_to_primitive_ordinary(duk_hthread *thr, duk_idx_t idx, duk_int_t hint); +#endif + +/* Raw internal valstack access macros: access is unsafe so call site + * must have a guarantee that the index is valid. When that is the case, + * using these macro results in faster and smaller code than duk_get_tval(). + * Both 'ctx' and 'idx' are evaluted multiple times, but only for asserts. + */ +#define DUK_ASSERT_VALID_NEGIDX(thr,idx) \ + (DUK_ASSERT_EXPR((duk_int_t) (idx) < 0), DUK_ASSERT_EXPR(duk_is_valid_index((thr), (idx)))) +#define DUK_ASSERT_VALID_POSIDX(thr,idx) \ + (DUK_ASSERT_EXPR((duk_int_t) (idx) >= 0), DUK_ASSERT_EXPR(duk_is_valid_index((thr), (idx)))) +#define DUK_GET_TVAL_NEGIDX(thr,idx) \ + (DUK_ASSERT_VALID_NEGIDX((thr),(idx)), ((duk_hthread *) (thr))->valstack_top + (idx)) +#define DUK_GET_TVAL_POSIDX(thr,idx) \ + (DUK_ASSERT_VALID_POSIDX((thr),(idx)), ((duk_hthread *) (thr))->valstack_bottom + (idx)) +#define DUK_GET_HOBJECT_NEGIDX(thr,idx) \ + (DUK_ASSERT_VALID_NEGIDX((thr),(idx)), DUK_TVAL_GET_OBJECT(((duk_hthread *) (thr))->valstack_top + (idx))) +#define DUK_GET_HOBJECT_POSIDX(thr,idx) \ + (DUK_ASSERT_VALID_POSIDX((thr),(idx)), DUK_TVAL_GET_OBJECT(((duk_hthread *) (thr))->valstack_bottom + (idx))) + +#define DUK_GET_THIS_TVAL_PTR(thr) \ + (DUK_ASSERT_EXPR((thr)->valstack_bottom > (thr)->valstack), \ + (thr)->valstack_bottom - 1) + +DUK_INTERNAL_DECL duk_double_t duk_time_get_ecmascript_time(duk_hthread *thr); +DUK_INTERNAL_DECL duk_double_t duk_time_get_ecmascript_time_nofrac(duk_hthread *thr); +DUK_INTERNAL_DECL duk_double_t duk_time_get_monotonic_time(duk_hthread *thr); + +#endif /* DUK_API_INTERNAL_H_INCLUDED */ +/* #include duk_hstring.h */ +#line 1 "duk_hstring.h" +/* + * Heap string representation. + * + * Strings are byte sequences ordinarily stored in extended UTF-8 format, + * allowing values larger than the official UTF-8 range (used internally) + * and also allowing UTF-8 encoding of surrogate pairs (CESU-8 format). + * Strings may also be invalid UTF-8 altogether which is the case e.g. with + * strings used as internal property names and raw buffers converted to + * strings. In such cases the 'clen' field contains an inaccurate value. + * + * ECMAScript requires support for 32-bit long strings. However, since each + * 16-bit codepoint can take 3 bytes in CESU-8, this representation can only + * support about 1.4G codepoint long strings in extreme cases. This is not + * really a practical issue. + */ + +#if !defined(DUK_HSTRING_H_INCLUDED) +#define DUK_HSTRING_H_INCLUDED + +/* Impose a maximum string length for now. Restricted artificially to + * ensure adding a heap header length won't overflow size_t. The limit + * should be synchronized with DUK_HBUFFER_MAX_BYTELEN. + * + * E5.1 makes provisions to support strings longer than 4G characters. + * This limit should be eliminated on 64-bit platforms (and increased + * closer to maximum support on 32-bit platforms). + */ + +#if defined(DUK_USE_STRLEN16) +#define DUK_HSTRING_MAX_BYTELEN (0x0000ffffUL) +#else +#define DUK_HSTRING_MAX_BYTELEN (0x7fffffffUL) +#endif + +/* XXX: could add flags for "is valid CESU-8" (ECMAScript compatible strings), + * "is valid UTF-8", "is valid extended UTF-8" (internal strings are not, + * regexp bytecode is), and "contains non-BMP characters". These are not + * needed right now. + */ + +/* With lowmem builds the high 16 bits of duk_heaphdr are used for other + * purposes, so this leaves 7 duk_heaphdr flags and 9 duk_hstring flags. + */ +#define DUK_HSTRING_FLAG_ASCII DUK_HEAPHDR_USER_FLAG(0) /* string is ASCII, clen == blen */ +#define DUK_HSTRING_FLAG_ARRIDX DUK_HEAPHDR_USER_FLAG(1) /* string is a valid array index */ +#define DUK_HSTRING_FLAG_SYMBOL DUK_HEAPHDR_USER_FLAG(2) /* string is a symbol (invalid utf-8) */ +#define DUK_HSTRING_FLAG_HIDDEN DUK_HEAPHDR_USER_FLAG(3) /* string is a hidden symbol (implies symbol, Duktape 1.x internal string) */ +#define DUK_HSTRING_FLAG_RESERVED_WORD DUK_HEAPHDR_USER_FLAG(4) /* string is a reserved word (non-strict) */ +#define DUK_HSTRING_FLAG_STRICT_RESERVED_WORD DUK_HEAPHDR_USER_FLAG(5) /* string is a reserved word (strict) */ +#define DUK_HSTRING_FLAG_EVAL_OR_ARGUMENTS DUK_HEAPHDR_USER_FLAG(6) /* string is 'eval' or 'arguments' */ +#define DUK_HSTRING_FLAG_EXTDATA DUK_HEAPHDR_USER_FLAG(7) /* string data is external (duk_hstring_external) */ +#define DUK_HSTRING_FLAG_PINNED_LITERAL DUK_HEAPHDR_USER_FLAG(8) /* string is a literal, and pinned */ + +#define DUK_HSTRING_HAS_ASCII(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_ASCII) +#define DUK_HSTRING_HAS_ARRIDX(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_ARRIDX) +#define DUK_HSTRING_HAS_SYMBOL(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_SYMBOL) +#define DUK_HSTRING_HAS_HIDDEN(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_HIDDEN) +#define DUK_HSTRING_HAS_RESERVED_WORD(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_RESERVED_WORD) +#define DUK_HSTRING_HAS_STRICT_RESERVED_WORD(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_STRICT_RESERVED_WORD) +#define DUK_HSTRING_HAS_EVAL_OR_ARGUMENTS(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_EVAL_OR_ARGUMENTS) +#define DUK_HSTRING_HAS_EXTDATA(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_EXTDATA) +#define DUK_HSTRING_HAS_PINNED_LITERAL(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_PINNED_LITERAL) + +#define DUK_HSTRING_SET_ASCII(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_ASCII) +#define DUK_HSTRING_SET_ARRIDX(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_ARRIDX) +#define DUK_HSTRING_SET_SYMBOL(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_SYMBOL) +#define DUK_HSTRING_SET_HIDDEN(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_HIDDEN) +#define DUK_HSTRING_SET_RESERVED_WORD(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_RESERVED_WORD) +#define DUK_HSTRING_SET_STRICT_RESERVED_WORD(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_STRICT_RESERVED_WORD) +#define DUK_HSTRING_SET_EVAL_OR_ARGUMENTS(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_EVAL_OR_ARGUMENTS) +#define DUK_HSTRING_SET_EXTDATA(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_EXTDATA) +#define DUK_HSTRING_SET_PINNED_LITERAL(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_PINNED_LITERAL) + +#define DUK_HSTRING_CLEAR_ASCII(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_ASCII) +#define DUK_HSTRING_CLEAR_ARRIDX(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_ARRIDX) +#define DUK_HSTRING_CLEAR_SYMBOL(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_SYMBOL) +#define DUK_HSTRING_CLEAR_HIDDEN(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_HIDDEN) +#define DUK_HSTRING_CLEAR_RESERVED_WORD(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_RESERVED_WORD) +#define DUK_HSTRING_CLEAR_STRICT_RESERVED_WORD(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_STRICT_RESERVED_WORD) +#define DUK_HSTRING_CLEAR_EVAL_OR_ARGUMENTS(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_EVAL_OR_ARGUMENTS) +#define DUK_HSTRING_CLEAR_EXTDATA(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_EXTDATA) +#define DUK_HSTRING_CLEAR_PINNED_LITERAL(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HSTRING_FLAG_PINNED_LITERAL) + +#if 0 /* Slightly smaller code without explicit flag, but explicit flag + * is very useful when 'clen' is dropped. + */ +#define DUK_HSTRING_IS_ASCII(x) (DUK_HSTRING_GET_BYTELEN((x)) == DUK_HSTRING_GET_CHARLEN((x))) +#endif +#define DUK_HSTRING_IS_ASCII(x) DUK_HSTRING_HAS_ASCII((x)) /* lazily set! */ +#define DUK_HSTRING_IS_EMPTY(x) (DUK_HSTRING_GET_BYTELEN((x)) == 0) + +#if defined(DUK_USE_STRHASH16) +#define DUK_HSTRING_GET_HASH(x) ((x)->hdr.h_flags >> 16) +#define DUK_HSTRING_SET_HASH(x,v) do { \ + (x)->hdr.h_flags = ((x)->hdr.h_flags & 0x0000ffffUL) | ((v) << 16); \ + } while (0) +#else +#define DUK_HSTRING_GET_HASH(x) ((x)->hash) +#define DUK_HSTRING_SET_HASH(x,v) do { \ + (x)->hash = (v); \ + } while (0) +#endif + +#if defined(DUK_USE_STRLEN16) +#define DUK_HSTRING_GET_BYTELEN(x) ((x)->hdr.h_strextra16) +#define DUK_HSTRING_SET_BYTELEN(x,v) do { \ + (x)->hdr.h_strextra16 = (v); \ + } while (0) +#if defined(DUK_USE_HSTRING_CLEN) +#define DUK_HSTRING_GET_CHARLEN(x) duk_hstring_get_charlen((x)) +#define DUK_HSTRING_SET_CHARLEN(x,v) do { \ + (x)->clen16 = (v); \ + } while (0) +#else +#define DUK_HSTRING_GET_CHARLEN(x) duk_hstring_get_charlen((x)) +#define DUK_HSTRING_SET_CHARLEN(x,v) do { \ + DUK_ASSERT(0); /* should never be called */ \ + } while (0) +#endif +#else +#define DUK_HSTRING_GET_BYTELEN(x) ((x)->blen) +#define DUK_HSTRING_SET_BYTELEN(x,v) do { \ + (x)->blen = (v); \ + } while (0) +#define DUK_HSTRING_GET_CHARLEN(x) duk_hstring_get_charlen((x)) +#define DUK_HSTRING_SET_CHARLEN(x,v) do { \ + (x)->clen = (v); \ + } while (0) +#endif + +#if defined(DUK_USE_HSTRING_EXTDATA) +#define DUK_HSTRING_GET_EXTDATA(x) \ + ((x)->extdata) +#define DUK_HSTRING_GET_DATA(x) \ + (DUK_HSTRING_HAS_EXTDATA((x)) ? \ + DUK_HSTRING_GET_EXTDATA((const duk_hstring_external *) (x)) : ((const duk_uint8_t *) ((x) + 1))) +#else +#define DUK_HSTRING_GET_DATA(x) \ + ((const duk_uint8_t *) ((x) + 1)) +#endif + +#define DUK_HSTRING_GET_DATA_END(x) \ + (DUK_HSTRING_GET_DATA((x)) + (x)->blen) + +/* Marker value; in E5 2^32-1 is not a valid array index (2^32-2 is highest + * valid). + */ +#define DUK_HSTRING_NO_ARRAY_INDEX (0xffffffffUL) + +#if defined(DUK_USE_HSTRING_ARRIDX) +#define DUK_HSTRING_GET_ARRIDX_FAST(h) ((h)->arridx) +#define DUK_HSTRING_GET_ARRIDX_SLOW(h) ((h)->arridx) +#else +/* Get array index related to string (or return DUK_HSTRING_NO_ARRAY_INDEX); + * avoids helper call if string has no array index value. + */ +#define DUK_HSTRING_GET_ARRIDX_FAST(h) \ + (DUK_HSTRING_HAS_ARRIDX((h)) ? duk_js_to_arrayindex_hstring_fast_known((h)) : DUK_HSTRING_NO_ARRAY_INDEX) + +/* Slower but more compact variant. */ +#define DUK_HSTRING_GET_ARRIDX_SLOW(h) \ + (duk_js_to_arrayindex_hstring_fast((h))) +#endif + +/* XXX: these actually fit into duk_hstring */ +#define DUK_SYMBOL_TYPE_HIDDEN 0 +#define DUK_SYMBOL_TYPE_GLOBAL 1 +#define DUK_SYMBOL_TYPE_LOCAL 2 +#define DUK_SYMBOL_TYPE_WELLKNOWN 3 + +/* + * Misc + */ + +struct duk_hstring { + /* Smaller heaphdr than for other objects, because strings are held + * in string intern table which requires no link pointers. Much of + * the 32-bit flags field is unused by flags, so we can stuff a 16-bit + * field in there. + */ + duk_heaphdr_string hdr; + + /* String hash. */ +#if defined(DUK_USE_STRHASH16) + /* If 16-bit hash is in use, stuff it into duk_heaphdr_string flags. */ +#else + duk_uint32_t hash; +#endif + + /* Precomputed array index (or DUK_HSTRING_NO_ARRAY_INDEX). */ +#if defined(DUK_USE_HSTRING_ARRIDX) + duk_uarridx_t arridx; +#endif + + /* Length in bytes (not counting NUL term). */ +#if defined(DUK_USE_STRLEN16) + /* placed in duk_heaphdr_string */ +#else + duk_uint32_t blen; +#endif + + /* Length in codepoints (must be E5 compatible). */ +#if defined(DUK_USE_STRLEN16) +#if defined(DUK_USE_HSTRING_CLEN) + duk_uint16_t clen16; +#else + /* computed live */ +#endif +#else + duk_uint32_t clen; +#endif + + /* + * String data of 'blen+1' bytes follows (+1 for NUL termination + * convenience for C API). No alignment needs to be guaranteed + * for strings, but fields above should guarantee alignment-by-4 + * (but not alignment-by-8). + */ +}; + +/* The external string struct is defined even when the feature is inactive. */ +struct duk_hstring_external { + duk_hstring str; + + /* + * For an external string, the NUL-terminated string data is stored + * externally. The user must guarantee that data behind this pointer + * doesn't change while it's used. + */ + + const duk_uint8_t *extdata; +}; + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL duk_ucodepoint_t duk_hstring_char_code_at_raw(duk_hthread *thr, duk_hstring *h, duk_uint_t pos, duk_bool_t surrogate_aware); +DUK_INTERNAL_DECL duk_bool_t duk_hstring_equals_ascii_cstring(duk_hstring *h, const char *cstr); +DUK_INTERNAL_DECL duk_size_t duk_hstring_get_charlen(duk_hstring *h); +#if !defined(DUK_USE_HSTRING_LAZY_CLEN) +DUK_INTERNAL_DECL void duk_hstring_init_charlen(duk_hstring *h); +#endif + +#endif /* DUK_HSTRING_H_INCLUDED */ +/* #include duk_hobject.h */ +#line 1 "duk_hobject.h" +/* + * Heap object representation. + * + * Heap objects are used for ECMAScript objects, arrays, and functions, + * but also for internal control like declarative and object environment + * records. Compiled functions, native functions, and threads are also + * objects but with an extended C struct. + * + * Objects provide the required ECMAScript semantics and exotic behaviors + * especially for property access. + * + * Properties are stored in three conceptual parts: + * + * 1. A linear 'entry part' contains ordered key-value-attributes triples + * and is the main method of string properties. + * + * 2. An optional linear 'array part' is used for array objects to store a + * (dense) range of [0,N[ array indexed entries with default attributes + * (writable, enumerable, configurable). If the array part would become + * sparse or non-default attributes are required, the array part is + * abandoned and moved to the 'entry part'. + * + * 3. An optional 'hash part' is used to optimize lookups of the entry + * part; it is used only for objects with sufficiently many properties + * and can be abandoned without loss of information. + * + * These three conceptual parts are stored in a single memory allocated area. + * This minimizes memory allocation overhead but also means that all three + * parts are resized together, and makes property access a bit complicated. + */ + +#if !defined(DUK_HOBJECT_H_INCLUDED) +#define DUK_HOBJECT_H_INCLUDED + +/* Object flags. Make sure this stays in sync with debugger object + * inspection code. + */ + +/* XXX: some flags are object subtype specific (e.g. common to all function + * subtypes, duk_harray, etc) and could be reused for different subtypes. + */ +#define DUK_HOBJECT_FLAG_EXTENSIBLE DUK_HEAPHDR_USER_FLAG(0) /* object is extensible */ +#define DUK_HOBJECT_FLAG_CONSTRUCTABLE DUK_HEAPHDR_USER_FLAG(1) /* object is constructable */ +#define DUK_HOBJECT_FLAG_CALLABLE DUK_HEAPHDR_USER_FLAG(2) /* object is callable */ +#define DUK_HOBJECT_FLAG_BOUNDFUNC DUK_HEAPHDR_USER_FLAG(3) /* object established using Function.prototype.bind() */ +#define DUK_HOBJECT_FLAG_COMPFUNC DUK_HEAPHDR_USER_FLAG(4) /* object is a compiled function (duk_hcompfunc) */ +#define DUK_HOBJECT_FLAG_NATFUNC DUK_HEAPHDR_USER_FLAG(5) /* object is a native function (duk_hnatfunc) */ +#define DUK_HOBJECT_FLAG_BUFOBJ DUK_HEAPHDR_USER_FLAG(6) /* object is a buffer object (duk_hbufobj) (always exotic) */ +#define DUK_HOBJECT_FLAG_FASTREFS DUK_HEAPHDR_USER_FLAG(7) /* object has no fields needing DECREF/marking beyond base duk_hobject header */ +#define DUK_HOBJECT_FLAG_ARRAY_PART DUK_HEAPHDR_USER_FLAG(8) /* object has an array part (a_size may still be 0) */ +#define DUK_HOBJECT_FLAG_STRICT DUK_HEAPHDR_USER_FLAG(9) /* function: function object is strict */ +#define DUK_HOBJECT_FLAG_NOTAIL DUK_HEAPHDR_USER_FLAG(10) /* function: function must not be tail called */ +#define DUK_HOBJECT_FLAG_NEWENV DUK_HEAPHDR_USER_FLAG(11) /* function: create new environment when called (see duk_hcompfunc) */ +#define DUK_HOBJECT_FLAG_NAMEBINDING DUK_HEAPHDR_USER_FLAG(12) /* function: create binding for func name (function templates only, used for named function expressions) */ +#define DUK_HOBJECT_FLAG_CREATEARGS DUK_HEAPHDR_USER_FLAG(13) /* function: create an arguments object on function call */ +#define DUK_HOBJECT_FLAG_HAVE_FINALIZER DUK_HEAPHDR_USER_FLAG(14) /* object has a callable (own) finalizer property */ +#define DUK_HOBJECT_FLAG_EXOTIC_ARRAY DUK_HEAPHDR_USER_FLAG(15) /* 'Array' object, array length and index exotic behavior */ +#define DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ DUK_HEAPHDR_USER_FLAG(16) /* 'String' object, array index exotic behavior */ +#define DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS DUK_HEAPHDR_USER_FLAG(17) /* 'Arguments' object and has arguments exotic behavior (non-strict callee) */ +#define DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ DUK_HEAPHDR_USER_FLAG(18) /* 'Proxy' object */ +#define DUK_HOBJECT_FLAG_SPECIAL_CALL DUK_HEAPHDR_USER_FLAG(19) /* special casing in call behavior, for .call(), .apply(), etc. */ + +#define DUK_HOBJECT_FLAG_CLASS_BASE DUK_HEAPHDR_USER_FLAG_NUMBER(20) +#define DUK_HOBJECT_FLAG_CLASS_BITS 5 + +#define DUK_HOBJECT_GET_CLASS_NUMBER(h) \ + DUK_HEAPHDR_GET_FLAG_RANGE(&(h)->hdr, DUK_HOBJECT_FLAG_CLASS_BASE, DUK_HOBJECT_FLAG_CLASS_BITS) +#define DUK_HOBJECT_SET_CLASS_NUMBER(h,v) \ + DUK_HEAPHDR_SET_FLAG_RANGE(&(h)->hdr, DUK_HOBJECT_FLAG_CLASS_BASE, DUK_HOBJECT_FLAG_CLASS_BITS, (v)) + +#define DUK_HOBJECT_GET_CLASS_MASK(h) \ + (1UL << DUK_HEAPHDR_GET_FLAG_RANGE(&(h)->hdr, DUK_HOBJECT_FLAG_CLASS_BASE, DUK_HOBJECT_FLAG_CLASS_BITS)) + +/* Macro for creating flag initializer from a class number. + * Unsigned type cast is needed to avoid warnings about coercing + * a signed integer to an unsigned one; the largest class values + * have the highest bit (bit 31) set which causes this. + */ +#define DUK_HOBJECT_CLASS_AS_FLAGS(v) (((duk_uint_t) (v)) << DUK_HOBJECT_FLAG_CLASS_BASE) + +/* E5 Section 8.6.2 + custom classes */ +#define DUK_HOBJECT_CLASS_NONE 0 +#define DUK_HOBJECT_CLASS_OBJECT 1 +#define DUK_HOBJECT_CLASS_ARRAY 2 +#define DUK_HOBJECT_CLASS_FUNCTION 3 +#define DUK_HOBJECT_CLASS_ARGUMENTS 4 +#define DUK_HOBJECT_CLASS_BOOLEAN 5 +#define DUK_HOBJECT_CLASS_DATE 6 +#define DUK_HOBJECT_CLASS_ERROR 7 +#define DUK_HOBJECT_CLASS_JSON 8 +#define DUK_HOBJECT_CLASS_MATH 9 +#define DUK_HOBJECT_CLASS_NUMBER 10 +#define DUK_HOBJECT_CLASS_REGEXP 11 +#define DUK_HOBJECT_CLASS_STRING 12 +#define DUK_HOBJECT_CLASS_GLOBAL 13 +#define DUK_HOBJECT_CLASS_SYMBOL 14 +#define DUK_HOBJECT_CLASS_OBJENV 15 /* custom */ +#define DUK_HOBJECT_CLASS_DECENV 16 /* custom */ +#define DUK_HOBJECT_CLASS_POINTER 17 /* custom */ +#define DUK_HOBJECT_CLASS_THREAD 18 /* custom; implies DUK_HOBJECT_IS_THREAD */ +#define DUK_HOBJECT_CLASS_BUFOBJ_MIN 19 +#define DUK_HOBJECT_CLASS_ARRAYBUFFER 19 /* implies DUK_HOBJECT_IS_BUFOBJ */ +#define DUK_HOBJECT_CLASS_DATAVIEW 20 +#define DUK_HOBJECT_CLASS_INT8ARRAY 21 +#define DUK_HOBJECT_CLASS_UINT8ARRAY 22 +#define DUK_HOBJECT_CLASS_UINT8CLAMPEDARRAY 23 +#define DUK_HOBJECT_CLASS_INT16ARRAY 24 +#define DUK_HOBJECT_CLASS_UINT16ARRAY 25 +#define DUK_HOBJECT_CLASS_INT32ARRAY 26 +#define DUK_HOBJECT_CLASS_UINT32ARRAY 27 +#define DUK_HOBJECT_CLASS_FLOAT32ARRAY 28 +#define DUK_HOBJECT_CLASS_FLOAT64ARRAY 29 +#define DUK_HOBJECT_CLASS_BUFOBJ_MAX 29 +#define DUK_HOBJECT_CLASS_MAX 29 + +/* Class masks. */ +#define DUK_HOBJECT_CMASK_ALL ((1UL << (DUK_HOBJECT_CLASS_MAX + 1)) - 1UL) +#define DUK_HOBJECT_CMASK_NONE (1UL << DUK_HOBJECT_CLASS_NONE) +#define DUK_HOBJECT_CMASK_ARGUMENTS (1UL << DUK_HOBJECT_CLASS_ARGUMENTS) +#define DUK_HOBJECT_CMASK_ARRAY (1UL << DUK_HOBJECT_CLASS_ARRAY) +#define DUK_HOBJECT_CMASK_BOOLEAN (1UL << DUK_HOBJECT_CLASS_BOOLEAN) +#define DUK_HOBJECT_CMASK_DATE (1UL << DUK_HOBJECT_CLASS_DATE) +#define DUK_HOBJECT_CMASK_ERROR (1UL << DUK_HOBJECT_CLASS_ERROR) +#define DUK_HOBJECT_CMASK_FUNCTION (1UL << DUK_HOBJECT_CLASS_FUNCTION) +#define DUK_HOBJECT_CMASK_JSON (1UL << DUK_HOBJECT_CLASS_JSON) +#define DUK_HOBJECT_CMASK_MATH (1UL << DUK_HOBJECT_CLASS_MATH) +#define DUK_HOBJECT_CMASK_NUMBER (1UL << DUK_HOBJECT_CLASS_NUMBER) +#define DUK_HOBJECT_CMASK_OBJECT (1UL << DUK_HOBJECT_CLASS_OBJECT) +#define DUK_HOBJECT_CMASK_REGEXP (1UL << DUK_HOBJECT_CLASS_REGEXP) +#define DUK_HOBJECT_CMASK_STRING (1UL << DUK_HOBJECT_CLASS_STRING) +#define DUK_HOBJECT_CMASK_GLOBAL (1UL << DUK_HOBJECT_CLASS_GLOBAL) +#define DUK_HOBJECT_CMASK_SYMBOL (1UL << DUK_HOBJECT_CLASS_SYMBOL) +#define DUK_HOBJECT_CMASK_OBJENV (1UL << DUK_HOBJECT_CLASS_OBJENV) +#define DUK_HOBJECT_CMASK_DECENV (1UL << DUK_HOBJECT_CLASS_DECENV) +#define DUK_HOBJECT_CMASK_POINTER (1UL << DUK_HOBJECT_CLASS_POINTER) +#define DUK_HOBJECT_CMASK_ARRAYBUFFER (1UL << DUK_HOBJECT_CLASS_ARRAYBUFFER) +#define DUK_HOBJECT_CMASK_DATAVIEW (1UL << DUK_HOBJECT_CLASS_DATAVIEW) +#define DUK_HOBJECT_CMASK_INT8ARRAY (1UL << DUK_HOBJECT_CLASS_INT8ARRAY) +#define DUK_HOBJECT_CMASK_UINT8ARRAY (1UL << DUK_HOBJECT_CLASS_UINT8ARRAY) +#define DUK_HOBJECT_CMASK_UINT8CLAMPEDARRAY (1UL << DUK_HOBJECT_CLASS_UINT8CLAMPEDARRAY) +#define DUK_HOBJECT_CMASK_INT16ARRAY (1UL << DUK_HOBJECT_CLASS_INT16ARRAY) +#define DUK_HOBJECT_CMASK_UINT16ARRAY (1UL << DUK_HOBJECT_CLASS_UINT16ARRAY) +#define DUK_HOBJECT_CMASK_INT32ARRAY (1UL << DUK_HOBJECT_CLASS_INT32ARRAY) +#define DUK_HOBJECT_CMASK_UINT32ARRAY (1UL << DUK_HOBJECT_CLASS_UINT32ARRAY) +#define DUK_HOBJECT_CMASK_FLOAT32ARRAY (1UL << DUK_HOBJECT_CLASS_FLOAT32ARRAY) +#define DUK_HOBJECT_CMASK_FLOAT64ARRAY (1UL << DUK_HOBJECT_CLASS_FLOAT64ARRAY) + +#define DUK_HOBJECT_CMASK_ALL_BUFOBJS \ + (DUK_HOBJECT_CMASK_ARRAYBUFFER | \ + DUK_HOBJECT_CMASK_DATAVIEW | \ + DUK_HOBJECT_CMASK_INT8ARRAY | \ + DUK_HOBJECT_CMASK_UINT8ARRAY | \ + DUK_HOBJECT_CMASK_UINT8CLAMPEDARRAY | \ + DUK_HOBJECT_CMASK_INT16ARRAY | \ + DUK_HOBJECT_CMASK_UINT16ARRAY | \ + DUK_HOBJECT_CMASK_INT32ARRAY | \ + DUK_HOBJECT_CMASK_UINT32ARRAY | \ + DUK_HOBJECT_CMASK_FLOAT32ARRAY | \ + DUK_HOBJECT_CMASK_FLOAT64ARRAY) + +#define DUK_HOBJECT_IS_OBJENV(h) (DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_OBJENV) +#define DUK_HOBJECT_IS_DECENV(h) (DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_DECENV) +#define DUK_HOBJECT_IS_ENV(h) (DUK_HOBJECT_IS_OBJENV((h)) || DUK_HOBJECT_IS_DECENV((h))) +#define DUK_HOBJECT_IS_ARRAY(h) DUK_HOBJECT_HAS_EXOTIC_ARRAY((h)) /* Rely on class Array <=> exotic Array */ +#define DUK_HOBJECT_IS_BOUNDFUNC(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BOUNDFUNC) +#define DUK_HOBJECT_IS_COMPFUNC(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_COMPFUNC) +#define DUK_HOBJECT_IS_NATFUNC(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NATFUNC) +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#define DUK_HOBJECT_IS_BUFOBJ(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BUFOBJ) +#else +#define DUK_HOBJECT_IS_BUFOBJ(h) 0 +#endif +#define DUK_HOBJECT_IS_THREAD(h) (DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_THREAD) +#if defined(DUK_USE_ES6_PROXY) +#define DUK_HOBJECT_IS_PROXY(h) DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ((h)) +#else +#define DUK_HOBJECT_IS_PROXY(h) 0 +#endif + +#define DUK_HOBJECT_IS_NONBOUND_FUNCTION(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, \ + DUK_HOBJECT_FLAG_COMPFUNC | \ + DUK_HOBJECT_FLAG_NATFUNC) + +#define DUK_HOBJECT_IS_FUNCTION(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, \ + DUK_HOBJECT_FLAG_BOUNDFUNC | \ + DUK_HOBJECT_FLAG_COMPFUNC | \ + DUK_HOBJECT_FLAG_NATFUNC) + +#define DUK_HOBJECT_IS_CALLABLE(h) DUK_HOBJECT_HAS_CALLABLE((h)) + +/* Object has any exotic behavior(s). */ +#define DUK_HOBJECT_EXOTIC_BEHAVIOR_FLAGS (DUK_HOBJECT_FLAG_EXOTIC_ARRAY | \ + DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS | \ + DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ | \ + DUK_HOBJECT_FLAG_BUFOBJ | \ + DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ) +#define DUK_HOBJECT_HAS_EXOTIC_BEHAVIOR(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_EXOTIC_BEHAVIOR_FLAGS) + +/* Object has any virtual properties (not counting Proxy behavior). */ +#define DUK_HOBJECT_VIRTUAL_PROPERTY_FLAGS (DUK_HOBJECT_FLAG_EXOTIC_ARRAY | \ + DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ | \ + DUK_HOBJECT_FLAG_BUFOBJ) +#define DUK_HOBJECT_HAS_VIRTUAL_PROPERTIES(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_VIRTUAL_PROPERTY_FLAGS) + +#define DUK_HOBJECT_HAS_EXTENSIBLE(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXTENSIBLE) +#define DUK_HOBJECT_HAS_CONSTRUCTABLE(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CONSTRUCTABLE) +#define DUK_HOBJECT_HAS_CALLABLE(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CALLABLE) +#define DUK_HOBJECT_HAS_BOUNDFUNC(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BOUNDFUNC) +#define DUK_HOBJECT_HAS_COMPFUNC(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_COMPFUNC) +#define DUK_HOBJECT_HAS_NATFUNC(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NATFUNC) +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#define DUK_HOBJECT_HAS_BUFOBJ(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BUFOBJ) +#else +#define DUK_HOBJECT_HAS_BUFOBJ(h) 0 +#endif +#define DUK_HOBJECT_HAS_FASTREFS(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_FASTREFS) +#define DUK_HOBJECT_HAS_ARRAY_PART(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_ARRAY_PART) +#define DUK_HOBJECT_HAS_STRICT(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_STRICT) +#define DUK_HOBJECT_HAS_NOTAIL(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NOTAIL) +#define DUK_HOBJECT_HAS_NEWENV(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NEWENV) +#define DUK_HOBJECT_HAS_NAMEBINDING(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NAMEBINDING) +#define DUK_HOBJECT_HAS_CREATEARGS(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CREATEARGS) +#define DUK_HOBJECT_HAS_HAVE_FINALIZER(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_HAVE_FINALIZER) +#define DUK_HOBJECT_HAS_EXOTIC_ARRAY(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_ARRAY) +#define DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ) +#define DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS) +#if defined(DUK_USE_ES6_PROXY) +#define DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ) +#else +#define DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h) 0 +#endif +#define DUK_HOBJECT_HAS_SPECIAL_CALL(h) DUK_HEAPHDR_CHECK_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_SPECIAL_CALL) + +#define DUK_HOBJECT_SET_EXTENSIBLE(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXTENSIBLE) +#define DUK_HOBJECT_SET_CONSTRUCTABLE(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CONSTRUCTABLE) +#define DUK_HOBJECT_SET_CALLABLE(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CALLABLE) +#define DUK_HOBJECT_SET_BOUNDFUNC(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BOUNDFUNC) +#define DUK_HOBJECT_SET_COMPFUNC(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_COMPFUNC) +#define DUK_HOBJECT_SET_NATFUNC(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NATFUNC) +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#define DUK_HOBJECT_SET_BUFOBJ(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BUFOBJ) +#endif +#define DUK_HOBJECT_SET_FASTREFS(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_FASTREFS) +#define DUK_HOBJECT_SET_ARRAY_PART(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_ARRAY_PART) +#define DUK_HOBJECT_SET_STRICT(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_STRICT) +#define DUK_HOBJECT_SET_NOTAIL(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NOTAIL) +#define DUK_HOBJECT_SET_NEWENV(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NEWENV) +#define DUK_HOBJECT_SET_NAMEBINDING(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NAMEBINDING) +#define DUK_HOBJECT_SET_CREATEARGS(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CREATEARGS) +#define DUK_HOBJECT_SET_HAVE_FINALIZER(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_HAVE_FINALIZER) +#define DUK_HOBJECT_SET_EXOTIC_ARRAY(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_ARRAY) +#define DUK_HOBJECT_SET_EXOTIC_STRINGOBJ(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ) +#define DUK_HOBJECT_SET_EXOTIC_ARGUMENTS(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS) +#if defined(DUK_USE_ES6_PROXY) +#define DUK_HOBJECT_SET_EXOTIC_PROXYOBJ(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ) +#endif +#define DUK_HOBJECT_SET_SPECIAL_CALL(h) DUK_HEAPHDR_SET_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_SPECIAL_CALL) + +#define DUK_HOBJECT_CLEAR_EXTENSIBLE(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXTENSIBLE) +#define DUK_HOBJECT_CLEAR_CONSTRUCTABLE(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CONSTRUCTABLE) +#define DUK_HOBJECT_CLEAR_CALLABLE(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CALLABLE) +#define DUK_HOBJECT_CLEAR_BOUNDFUNC(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BOUNDFUNC) +#define DUK_HOBJECT_CLEAR_COMPFUNC(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_COMPFUNC) +#define DUK_HOBJECT_CLEAR_NATFUNC(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NATFUNC) +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#define DUK_HOBJECT_CLEAR_BUFOBJ(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_BUFOBJ) +#endif +#define DUK_HOBJECT_CLEAR_FASTREFS(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_FASTREFS) +#define DUK_HOBJECT_CLEAR_ARRAY_PART(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_ARRAY_PART) +#define DUK_HOBJECT_CLEAR_STRICT(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_STRICT) +#define DUK_HOBJECT_CLEAR_NOTAIL(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NOTAIL) +#define DUK_HOBJECT_CLEAR_NEWENV(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NEWENV) +#define DUK_HOBJECT_CLEAR_NAMEBINDING(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_NAMEBINDING) +#define DUK_HOBJECT_CLEAR_CREATEARGS(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_CREATEARGS) +#define DUK_HOBJECT_CLEAR_HAVE_FINALIZER(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_HAVE_FINALIZER) +#define DUK_HOBJECT_CLEAR_EXOTIC_ARRAY(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_ARRAY) +#define DUK_HOBJECT_CLEAR_EXOTIC_STRINGOBJ(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ) +#define DUK_HOBJECT_CLEAR_EXOTIC_ARGUMENTS(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS) +#if defined(DUK_USE_ES6_PROXY) +#define DUK_HOBJECT_CLEAR_EXOTIC_PROXYOBJ(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ) +#endif +#define DUK_HOBJECT_CLEAR_SPECIAL_CALL(h) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(h)->hdr, DUK_HOBJECT_FLAG_SPECIAL_CALL) + +/* Object can/cannot use FASTREFS, i.e. has no strong reference fields beyond + * duk_hobject base header. This is used just for asserts so doesn't need to + * be optimized. + */ +#define DUK_HOBJECT_PROHIBITS_FASTREFS(h) \ + (DUK_HOBJECT_IS_COMPFUNC((h)) || DUK_HOBJECT_IS_DECENV((h)) || DUK_HOBJECT_IS_OBJENV((h)) || \ + DUK_HOBJECT_IS_BUFOBJ((h)) || DUK_HOBJECT_IS_THREAD((h)) || DUK_HOBJECT_IS_PROXY((h)) || \ + DUK_HOBJECT_IS_BOUNDFUNC((h))) +#define DUK_HOBJECT_ALLOWS_FASTREFS(h) (!DUK_HOBJECT_PROHIBITS_FASTREFS((h))) + +/* Flags used for property attributes in duk_propdesc and packed flags. + * Must fit into 8 bits. + */ +#define DUK_PROPDESC_FLAG_WRITABLE (1U << 0) /* E5 Section 8.6.1 */ +#define DUK_PROPDESC_FLAG_ENUMERABLE (1U << 1) /* E5 Section 8.6.1 */ +#define DUK_PROPDESC_FLAG_CONFIGURABLE (1U << 2) /* E5 Section 8.6.1 */ +#define DUK_PROPDESC_FLAG_ACCESSOR (1U << 3) /* accessor */ +#define DUK_PROPDESC_FLAG_VIRTUAL (1U << 4) /* property is virtual: used in duk_propdesc, never stored + * (used by e.g. buffer virtual properties) + */ +#define DUK_PROPDESC_FLAGS_MASK (DUK_PROPDESC_FLAG_WRITABLE | \ + DUK_PROPDESC_FLAG_ENUMERABLE | \ + DUK_PROPDESC_FLAG_CONFIGURABLE | \ + DUK_PROPDESC_FLAG_ACCESSOR) + +/* Additional flags which are passed in the same flags argument as property + * flags but are not stored in object properties. + */ +#define DUK_PROPDESC_FLAG_NO_OVERWRITE (1U << 4) /* internal define property: skip write silently if exists */ + +/* Convenience defines for property attributes. */ +#define DUK_PROPDESC_FLAGS_NONE 0 +#define DUK_PROPDESC_FLAGS_W (DUK_PROPDESC_FLAG_WRITABLE) +#define DUK_PROPDESC_FLAGS_E (DUK_PROPDESC_FLAG_ENUMERABLE) +#define DUK_PROPDESC_FLAGS_C (DUK_PROPDESC_FLAG_CONFIGURABLE) +#define DUK_PROPDESC_FLAGS_WE (DUK_PROPDESC_FLAG_WRITABLE | DUK_PROPDESC_FLAG_ENUMERABLE) +#define DUK_PROPDESC_FLAGS_WC (DUK_PROPDESC_FLAG_WRITABLE | DUK_PROPDESC_FLAG_CONFIGURABLE) +#define DUK_PROPDESC_FLAGS_EC (DUK_PROPDESC_FLAG_ENUMERABLE | DUK_PROPDESC_FLAG_CONFIGURABLE) +#define DUK_PROPDESC_FLAGS_WEC (DUK_PROPDESC_FLAG_WRITABLE | \ + DUK_PROPDESC_FLAG_ENUMERABLE | \ + DUK_PROPDESC_FLAG_CONFIGURABLE) + +/* Flags for duk_hobject_get_own_propdesc() and variants. */ +#define DUK_GETDESC_FLAG_PUSH_VALUE (1U << 0) /* push value to stack */ +#define DUK_GETDESC_FLAG_IGNORE_PROTOLOOP (1U << 1) /* don't throw for prototype loop */ + +/* + * Macro for object validity check + * + * Assert for currently guaranteed relations between flags, for instance. + */ + +#define DUK_ASSERT_HOBJECT_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT(!DUK_HOBJECT_IS_CALLABLE((h)) || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_FUNCTION); \ + DUK_ASSERT(!DUK_HOBJECT_IS_BUFOBJ((h)) || \ + (DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_ARRAYBUFFER || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_DATAVIEW || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_INT8ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_UINT8ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_UINT8CLAMPEDARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_INT16ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_UINT16ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_INT32ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_UINT32ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_FLOAT32ARRAY || \ + DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_FLOAT64ARRAY)); \ + /* Object is an Array <=> object has exotic array behavior */ \ + DUK_ASSERT((DUK_HOBJECT_GET_CLASS_NUMBER((h)) == DUK_HOBJECT_CLASS_ARRAY && DUK_HOBJECT_HAS_EXOTIC_ARRAY((h))) || \ + (DUK_HOBJECT_GET_CLASS_NUMBER((h)) != DUK_HOBJECT_CLASS_ARRAY && !DUK_HOBJECT_HAS_EXOTIC_ARRAY((h)))); \ + } while (0) + +/* + * Macros to access the 'props' allocation. + */ + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HOBJECT_GET_PROPS(heap,h) \ + ((duk_uint8_t *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, ((duk_heaphdr *) (h))->h_extra16)) +#define DUK_HOBJECT_SET_PROPS(heap,h,x) do { \ + ((duk_heaphdr *) (h))->h_extra16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (x)); \ + } while (0) +#else +#define DUK_HOBJECT_GET_PROPS(heap,h) \ + ((h)->props) +#define DUK_HOBJECT_SET_PROPS(heap,h,x) do { \ + (h)->props = (duk_uint8_t *) (x); \ + } while (0) +#endif + +#if defined(DUK_USE_HOBJECT_LAYOUT_1) +/* LAYOUT 1 */ +#define DUK_HOBJECT_E_GET_KEY_BASE(heap,h) \ + ((duk_hstring **) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) \ + )) +#define DUK_HOBJECT_E_GET_VALUE_BASE(heap,h) \ + ((duk_propvalue *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * sizeof(duk_hstring *) \ + )) +#define DUK_HOBJECT_E_GET_FLAGS_BASE(heap,h) \ + ((duk_uint8_t *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_hstring *) + sizeof(duk_propvalue)) \ + )) +#define DUK_HOBJECT_A_GET_BASE(heap,h) \ + ((duk_tval *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_hstring *) + sizeof(duk_propvalue) + sizeof(duk_uint8_t)) \ + )) +#define DUK_HOBJECT_H_GET_BASE(heap,h) \ + ((duk_uint32_t *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_hstring *) + sizeof(duk_propvalue) + sizeof(duk_uint8_t)) + \ + DUK_HOBJECT_GET_ASIZE((h)) * sizeof(duk_tval) \ + )) +#define DUK_HOBJECT_P_COMPUTE_SIZE(n_ent,n_arr,n_hash) \ + ( \ + (n_ent) * (sizeof(duk_hstring *) + sizeof(duk_propvalue) + sizeof(duk_uint8_t)) + \ + (n_arr) * sizeof(duk_tval) + \ + (n_hash) * sizeof(duk_uint32_t) \ + ) +#define DUK_HOBJECT_P_SET_REALLOC_PTRS(p_base,set_e_k,set_e_pv,set_e_f,set_a,set_h,n_ent,n_arr,n_hash) do { \ + (set_e_k) = (duk_hstring **) (void *) (p_base); \ + (set_e_pv) = (duk_propvalue *) (void *) ((set_e_k) + (n_ent)); \ + (set_e_f) = (duk_uint8_t *) (void *) ((set_e_pv) + (n_ent)); \ + (set_a) = (duk_tval *) (void *) ((set_e_f) + (n_ent)); \ + (set_h) = (duk_uint32_t *) (void *) ((set_a) + (n_arr)); \ + } while (0) +#elif defined(DUK_USE_HOBJECT_LAYOUT_2) +/* LAYOUT 2 */ +#if (DUK_USE_ALIGN_BY == 4) +#define DUK_HOBJECT_E_FLAG_PADDING(e_sz) ((4 - (e_sz)) & 0x03) +#elif (DUK_USE_ALIGN_BY == 8) +#define DUK_HOBJECT_E_FLAG_PADDING(e_sz) ((8 - (e_sz)) & 0x07) +#elif (DUK_USE_ALIGN_BY == 1) +#define DUK_HOBJECT_E_FLAG_PADDING(e_sz) 0 +#else +#error invalid DUK_USE_ALIGN_BY +#endif +#define DUK_HOBJECT_E_GET_KEY_BASE(heap,h) \ + ((duk_hstring **) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * sizeof(duk_propvalue) \ + )) +#define DUK_HOBJECT_E_GET_VALUE_BASE(heap,h) \ + ((duk_propvalue *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) \ + )) +#define DUK_HOBJECT_E_GET_FLAGS_BASE(heap,h) \ + ((duk_uint8_t *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_hstring *) + sizeof(duk_propvalue)) \ + )) +#define DUK_HOBJECT_A_GET_BASE(heap,h) \ + ((duk_tval *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_hstring *) + sizeof(duk_propvalue) + sizeof(duk_uint8_t)) + \ + DUK_HOBJECT_E_FLAG_PADDING(DUK_HOBJECT_GET_ESIZE((h))) \ + )) +#define DUK_HOBJECT_H_GET_BASE(heap,h) \ + ((duk_uint32_t *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_hstring *) + sizeof(duk_propvalue) + sizeof(duk_uint8_t)) + \ + DUK_HOBJECT_E_FLAG_PADDING(DUK_HOBJECT_GET_ESIZE((h))) + \ + DUK_HOBJECT_GET_ASIZE((h)) * sizeof(duk_tval) \ + )) +#define DUK_HOBJECT_P_COMPUTE_SIZE(n_ent,n_arr,n_hash) \ + ( \ + (n_ent) * (sizeof(duk_hstring *) + sizeof(duk_propvalue) + sizeof(duk_uint8_t)) + \ + DUK_HOBJECT_E_FLAG_PADDING((n_ent)) + \ + (n_arr) * sizeof(duk_tval) + \ + (n_hash) * sizeof(duk_uint32_t) \ + ) +#define DUK_HOBJECT_P_SET_REALLOC_PTRS(p_base,set_e_k,set_e_pv,set_e_f,set_a,set_h,n_ent,n_arr,n_hash) do { \ + (set_e_pv) = (duk_propvalue *) (void *) (p_base); \ + (set_e_k) = (duk_hstring **) (void *) ((set_e_pv) + (n_ent)); \ + (set_e_f) = (duk_uint8_t *) (void *) ((set_e_k) + (n_ent)); \ + (set_a) = (duk_tval *) (void *) (((duk_uint8_t *) (set_e_f)) + \ + sizeof(duk_uint8_t) * (n_ent) + \ + DUK_HOBJECT_E_FLAG_PADDING((n_ent))); \ + (set_h) = (duk_uint32_t *) (void *) ((set_a) + (n_arr)); \ + } while (0) +#elif defined(DUK_USE_HOBJECT_LAYOUT_3) +/* LAYOUT 3 */ +#define DUK_HOBJECT_E_GET_KEY_BASE(heap,h) \ + ((duk_hstring **) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * sizeof(duk_propvalue) + \ + DUK_HOBJECT_GET_ASIZE((h)) * sizeof(duk_tval) \ + )) +#define DUK_HOBJECT_E_GET_VALUE_BASE(heap,h) \ + ((duk_propvalue *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) \ + )) +#define DUK_HOBJECT_E_GET_FLAGS_BASE(heap,h) \ + ((duk_uint8_t *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_propvalue) + sizeof(duk_hstring *)) + \ + DUK_HOBJECT_GET_ASIZE((h)) * sizeof(duk_tval) + \ + DUK_HOBJECT_GET_HSIZE((h)) * sizeof(duk_uint32_t) \ + )) +#define DUK_HOBJECT_A_GET_BASE(heap,h) \ + ((duk_tval *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * sizeof(duk_propvalue) \ + )) +#define DUK_HOBJECT_H_GET_BASE(heap,h) \ + ((duk_uint32_t *) (void *) ( \ + DUK_HOBJECT_GET_PROPS((heap), (h)) + \ + DUK_HOBJECT_GET_ESIZE((h)) * (sizeof(duk_propvalue) + sizeof(duk_hstring *)) + \ + DUK_HOBJECT_GET_ASIZE((h)) * sizeof(duk_tval) \ + )) +#define DUK_HOBJECT_P_COMPUTE_SIZE(n_ent,n_arr,n_hash) \ + ( \ + (n_ent) * (sizeof(duk_propvalue) + sizeof(duk_hstring *) + sizeof(duk_uint8_t)) + \ + (n_arr) * sizeof(duk_tval) + \ + (n_hash) * sizeof(duk_uint32_t) \ + ) +#define DUK_HOBJECT_P_SET_REALLOC_PTRS(p_base,set_e_k,set_e_pv,set_e_f,set_a,set_h,n_ent,n_arr,n_hash) do { \ + (set_e_pv) = (duk_propvalue *) (void *) (p_base); \ + (set_a) = (duk_tval *) (void *) ((set_e_pv) + (n_ent)); \ + (set_e_k) = (duk_hstring **) (void *) ((set_a) + (n_arr)); \ + (set_h) = (duk_uint32_t *) (void *) ((set_e_k) + (n_ent)); \ + (set_e_f) = (duk_uint8_t *) (void *) ((set_h) + (n_hash)); \ + } while (0) +#else +#error invalid hobject layout defines +#endif /* hobject property layout */ + +#define DUK_HOBJECT_P_ALLOC_SIZE(h) \ + DUK_HOBJECT_P_COMPUTE_SIZE(DUK_HOBJECT_GET_ESIZE((h)), DUK_HOBJECT_GET_ASIZE((h)), DUK_HOBJECT_GET_HSIZE((h))) + +#define DUK_HOBJECT_E_GET_KEY(heap,h,i) (DUK_HOBJECT_E_GET_KEY_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_E_GET_KEY_PTR(heap,h,i) (&DUK_HOBJECT_E_GET_KEY_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_E_GET_VALUE(heap,h,i) (DUK_HOBJECT_E_GET_VALUE_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_E_GET_VALUE_PTR(heap,h,i) (&DUK_HOBJECT_E_GET_VALUE_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_E_GET_VALUE_TVAL(heap,h,i) (DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).v) +#define DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(heap,h,i) (&DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).v) +#define DUK_HOBJECT_E_GET_VALUE_GETTER(heap,h,i) (DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).a.get) +#define DUK_HOBJECT_E_GET_VALUE_GETTER_PTR(heap,h,i) (&DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).a.get) +#define DUK_HOBJECT_E_GET_VALUE_SETTER(heap,h,i) (DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).a.set) +#define DUK_HOBJECT_E_GET_VALUE_SETTER_PTR(heap,h,i) (&DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).a.set) +#define DUK_HOBJECT_E_GET_FLAGS(heap,h,i) (DUK_HOBJECT_E_GET_FLAGS_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_E_GET_FLAGS_PTR(heap,h,i) (&DUK_HOBJECT_E_GET_FLAGS_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_A_GET_VALUE(heap,h,i) (DUK_HOBJECT_A_GET_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_A_GET_VALUE_PTR(heap,h,i) (&DUK_HOBJECT_A_GET_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_H_GET_INDEX(heap,h,i) (DUK_HOBJECT_H_GET_BASE((heap), (h))[(i)]) +#define DUK_HOBJECT_H_GET_INDEX_PTR(heap,h,i) (&DUK_HOBJECT_H_GET_BASE((heap), (h))[(i)]) + +#define DUK_HOBJECT_E_SET_KEY(heap,h,i,k) do { \ + DUK_HOBJECT_E_GET_KEY((heap), (h), (i)) = (k); \ + } while (0) +#define DUK_HOBJECT_E_SET_VALUE(heap,h,i,v) do { \ + DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)) = (v); \ + } while (0) +#define DUK_HOBJECT_E_SET_VALUE_TVAL(heap,h,i,v) do { \ + DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).v = (v); \ + } while (0) +#define DUK_HOBJECT_E_SET_VALUE_GETTER(heap,h,i,v) do { \ + DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).a.get = (v); \ + } while (0) +#define DUK_HOBJECT_E_SET_VALUE_SETTER(heap,h,i,v) do { \ + DUK_HOBJECT_E_GET_VALUE((heap), (h), (i)).a.set = (v); \ + } while (0) +#define DUK_HOBJECT_E_SET_FLAGS(heap,h,i,f) do { \ + DUK_HOBJECT_E_GET_FLAGS((heap), (h), (i)) = (duk_uint8_t) (f); \ + } while (0) +#define DUK_HOBJECT_A_SET_VALUE(heap,h,i,v) do { \ + DUK_HOBJECT_A_GET_VALUE((heap), (h), (i)) = (v); \ + } while (0) +#define DUK_HOBJECT_A_SET_VALUE_TVAL(heap,h,i,v) \ + DUK_HOBJECT_A_SET_VALUE((heap), (h), (i), (v)) /* alias for above */ +#define DUK_HOBJECT_H_SET_INDEX(heap,h,i,v) do { \ + DUK_HOBJECT_H_GET_INDEX((heap), (h), (i)) = (v); \ + } while (0) + +#define DUK_HOBJECT_E_SET_FLAG_BITS(heap,h,i,mask) do { \ + DUK_HOBJECT_E_GET_FLAGS_BASE((heap), (h))[(i)] |= (mask); \ + } while (0) + +#define DUK_HOBJECT_E_CLEAR_FLAG_BITS(heap,h,i,mask) do { \ + DUK_HOBJECT_E_GET_FLAGS_BASE((heap), (h))[(i)] &= ~(mask); \ + } while (0) + +#define DUK_HOBJECT_E_SLOT_IS_WRITABLE(heap,h,i) ((DUK_HOBJECT_E_GET_FLAGS((heap), (h), (i)) & DUK_PROPDESC_FLAG_WRITABLE) != 0) +#define DUK_HOBJECT_E_SLOT_IS_ENUMERABLE(heap,h,i) ((DUK_HOBJECT_E_GET_FLAGS((heap), (h), (i)) & DUK_PROPDESC_FLAG_ENUMERABLE) != 0) +#define DUK_HOBJECT_E_SLOT_IS_CONFIGURABLE(heap,h,i) ((DUK_HOBJECT_E_GET_FLAGS((heap), (h), (i)) & DUK_PROPDESC_FLAG_CONFIGURABLE) != 0) +#define DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap,h,i) ((DUK_HOBJECT_E_GET_FLAGS((heap), (h), (i)) & DUK_PROPDESC_FLAG_ACCESSOR) != 0) + +#define DUK_HOBJECT_E_SLOT_SET_WRITABLE(heap,h,i) DUK_HOBJECT_E_SET_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_WRITABLE) +#define DUK_HOBJECT_E_SLOT_SET_ENUMERABLE(heap,h,i) DUK_HOBJECT_E_SET_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_ENUMERABLE) +#define DUK_HOBJECT_E_SLOT_SET_CONFIGURABLE(heap,h,i) DUK_HOBJECT_E_SET_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_CONFIGURABLE) +#define DUK_HOBJECT_E_SLOT_SET_ACCESSOR(heap,h,i) DUK_HOBJECT_E_SET_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_ACCESSOR) + +#define DUK_HOBJECT_E_SLOT_CLEAR_WRITABLE(heap,h,i) DUK_HOBJECT_E_CLEAR_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_WRITABLE) +#define DUK_HOBJECT_E_SLOT_CLEAR_ENUMERABLE(heap,h,i) DUK_HOBJECT_E_CLEAR_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_ENUMERABLE) +#define DUK_HOBJECT_E_SLOT_CLEAR_CONFIGURABLE(heap,h,i) DUK_HOBJECT_E_CLEAR_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_CONFIGURABLE) +#define DUK_HOBJECT_E_SLOT_CLEAR_ACCESSOR(heap,h,i) DUK_HOBJECT_E_CLEAR_FLAG_BITS((heap), (h), (i),DUK_PROPDESC_FLAG_ACCESSOR) + +#define DUK_PROPDESC_IS_WRITABLE(p) (((p)->flags & DUK_PROPDESC_FLAG_WRITABLE) != 0) +#define DUK_PROPDESC_IS_ENUMERABLE(p) (((p)->flags & DUK_PROPDESC_FLAG_ENUMERABLE) != 0) +#define DUK_PROPDESC_IS_CONFIGURABLE(p) (((p)->flags & DUK_PROPDESC_FLAG_CONFIGURABLE) != 0) +#define DUK_PROPDESC_IS_ACCESSOR(p) (((p)->flags & DUK_PROPDESC_FLAG_ACCESSOR) != 0) + +#define DUK_HOBJECT_HASHIDX_UNUSED 0xffffffffUL +#define DUK_HOBJECT_HASHIDX_DELETED 0xfffffffeUL + +/* + * Macros for accessing size fields + */ + +#if defined(DUK_USE_OBJSIZES16) +#define DUK_HOBJECT_GET_ESIZE(h) ((h)->e_size16) +#define DUK_HOBJECT_SET_ESIZE(h,v) do { (h)->e_size16 = (v); } while (0) +#define DUK_HOBJECT_GET_ENEXT(h) ((h)->e_next16) +#define DUK_HOBJECT_SET_ENEXT(h,v) do { (h)->e_next16 = (v); } while (0) +#define DUK_HOBJECT_POSTINC_ENEXT(h) ((h)->e_next16++) +#define DUK_HOBJECT_GET_ASIZE(h) ((h)->a_size16) +#define DUK_HOBJECT_SET_ASIZE(h,v) do { (h)->a_size16 = (v); } while (0) +#if defined(DUK_USE_HOBJECT_HASH_PART) +#define DUK_HOBJECT_GET_HSIZE(h) ((h)->h_size16) +#define DUK_HOBJECT_SET_HSIZE(h,v) do { (h)->h_size16 = (v); } while (0) +#else +#define DUK_HOBJECT_GET_HSIZE(h) 0 +#define DUK_HOBJECT_SET_HSIZE(h,v) do { DUK_ASSERT((v) == 0); } while (0) +#endif +#else +#define DUK_HOBJECT_GET_ESIZE(h) ((h)->e_size) +#define DUK_HOBJECT_SET_ESIZE(h,v) do { (h)->e_size = (v); } while (0) +#define DUK_HOBJECT_GET_ENEXT(h) ((h)->e_next) +#define DUK_HOBJECT_SET_ENEXT(h,v) do { (h)->e_next = (v); } while (0) +#define DUK_HOBJECT_POSTINC_ENEXT(h) ((h)->e_next++) +#define DUK_HOBJECT_GET_ASIZE(h) ((h)->a_size) +#define DUK_HOBJECT_SET_ASIZE(h,v) do { (h)->a_size = (v); } while (0) +#if defined(DUK_USE_HOBJECT_HASH_PART) +#define DUK_HOBJECT_GET_HSIZE(h) ((h)->h_size) +#define DUK_HOBJECT_SET_HSIZE(h,v) do { (h)->h_size = (v); } while (0) +#else +#define DUK_HOBJECT_GET_HSIZE(h) 0 +#define DUK_HOBJECT_SET_HSIZE(h,v) do { DUK_ASSERT((v) == 0); } while (0) +#endif +#endif + +/* + * Misc + */ + +/* Maximum prototype traversal depth. Sanity limit which handles e.g. + * prototype loops (even complex ones like 1->2->3->4->2->3->4->2->3->4). + */ +#define DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY 10000L + +/* + * ECMAScript [[Class]] + */ + +/* range check not necessary because all 4-bit values are mapped */ +#define DUK_HOBJECT_CLASS_NUMBER_TO_STRIDX(n) duk_class_number_to_stridx[(n)] + +#define DUK_HOBJECT_GET_CLASS_STRING(heap,h) \ + DUK_HEAP_GET_STRING( \ + (heap), \ + DUK_HOBJECT_CLASS_NUMBER_TO_STRIDX(DUK_HOBJECT_GET_CLASS_NUMBER((h))) \ + ) + +/* + * Macros for property handling + */ + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HOBJECT_GET_PROTOTYPE(heap,h) \ + ((duk_hobject *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->prototype16)) +#define DUK_HOBJECT_SET_PROTOTYPE(heap,h,x) do { \ + (h)->prototype16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (x)); \ + } while (0) +#else +#define DUK_HOBJECT_GET_PROTOTYPE(heap,h) \ + ((h)->prototype) +#define DUK_HOBJECT_SET_PROTOTYPE(heap,h,x) do { \ + (h)->prototype = (x); \ + } while (0) +#endif + +/* Set prototype, DECREF earlier value, INCREF new value (tolerating NULLs). */ +#define DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr,h,p) duk_hobject_set_prototype_updref((thr), (h), (p)) + +/* Set initial prototype, assume NULL previous prototype, INCREF new value, + * tolerate NULL. + */ +#define DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr,h,proto) do { \ + duk_hthread *duk__thr = (thr); \ + duk_hobject *duk__obj = (h); \ + duk_hobject *duk__proto = (proto); \ + DUK_UNREF(duk__thr); \ + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(duk__thr->heap, duk__obj) == NULL); \ + DUK_HOBJECT_SET_PROTOTYPE(duk__thr->heap, duk__obj, duk__proto); \ + DUK_HOBJECT_INCREF_ALLOWNULL(duk__thr, duk__proto); \ + } while (0) + +/* + * Finalizer check + */ + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HOBJECT_HAS_FINALIZER_FAST(heap,h) duk_hobject_has_finalizer_fast_raw((heap), (h)) +#else +#define DUK_HOBJECT_HAS_FINALIZER_FAST(heap,h) duk_hobject_has_finalizer_fast_raw((h)) +#endif + +/* + * Resizing and hash behavior + */ + +/* Sanity limit on max number of properties (allocated, not necessarily used). + * This is somewhat arbitrary, but if we're close to 2**32 properties some + * algorithms will fail (e.g. hash size selection, next prime selection). + * Also, we use negative array/entry table indices to indicate 'not found', + * so anything above 0x80000000 will cause trouble now. + */ +#if defined(DUK_USE_OBJSIZES16) +#define DUK_HOBJECT_MAX_PROPERTIES 0x0000ffffUL +#else +#define DUK_HOBJECT_MAX_PROPERTIES 0x3fffffffUL /* 2**30-1 ~= 1G properties */ +#endif + +/* internal align target for props allocation, must be 2*n for some n */ +#if (DUK_USE_ALIGN_BY == 4) +#define DUK_HOBJECT_ALIGN_TARGET 4 +#elif (DUK_USE_ALIGN_BY == 8) +#define DUK_HOBJECT_ALIGN_TARGET 8 +#elif (DUK_USE_ALIGN_BY == 1) +#define DUK_HOBJECT_ALIGN_TARGET 1 +#else +#error invalid DUK_USE_ALIGN_BY +#endif + +/* + * PC-to-line constants + */ + +#define DUK_PC2LINE_SKIP 64 + +/* maximum length for a SKIP-1 diffstream: 35 bits per entry, rounded up to bytes */ +#define DUK_PC2LINE_MAX_DIFF_LENGTH (((DUK_PC2LINE_SKIP - 1) * 35 + 7) / 8) + +/* + * Struct defs + */ + +struct duk_propaccessor { + duk_hobject *get; + duk_hobject *set; +}; + +union duk_propvalue { + /* The get/set pointers could be 16-bit pointer compressed but it + * would make no difference on 32-bit platforms because duk_tval is + * 8 bytes or more anyway. + */ + duk_tval v; + duk_propaccessor a; +}; + +struct duk_propdesc { + /* read-only values 'lifted' for ease of use */ + duk_small_uint_t flags; + duk_hobject *get; + duk_hobject *set; + + /* for updating (all are set to < 0 for virtual properties) */ + duk_int_t e_idx; /* prop index in 'entry part', < 0 if not there */ + duk_int_t h_idx; /* prop index in 'hash part', < 0 if not there */ + duk_int_t a_idx; /* prop index in 'array part', < 0 if not there */ +}; + +struct duk_hobject { + duk_heaphdr hdr; + + /* + * 'props' contains {key,value,flags} entries, optional array entries, and + * an optional hash lookup table for non-array entries in a single 'sliced' + * allocation. There are several layout options, which differ slightly in + * generated code size/speed and alignment/padding; duk_features.h selects + * the layout used. + * + * Layout 1 (DUK_USE_HOBJECT_LAYOUT_1): + * + * e_size * sizeof(duk_hstring *) bytes of entry keys (e_next gc reachable) + * e_size * sizeof(duk_propvalue) bytes of entry values (e_next gc reachable) + * e_size * sizeof(duk_uint8_t) bytes of entry flags (e_next gc reachable) + * a_size * sizeof(duk_tval) bytes of (opt) array values (plain only) (all gc reachable) + * h_size * sizeof(duk_uint32_t) bytes of (opt) hash indexes to entries (e_size), + * 0xffffffffUL = unused, 0xfffffffeUL = deleted + * + * Layout 2 (DUK_USE_HOBJECT_LAYOUT_2): + * + * e_size * sizeof(duk_propvalue) bytes of entry values (e_next gc reachable) + * e_size * sizeof(duk_hstring *) bytes of entry keys (e_next gc reachable) + * e_size * sizeof(duk_uint8_t) + pad bytes of entry flags (e_next gc reachable) + * a_size * sizeof(duk_tval) bytes of (opt) array values (plain only) (all gc reachable) + * h_size * sizeof(duk_uint32_t) bytes of (opt) hash indexes to entries (e_size), + * 0xffffffffUL = unused, 0xfffffffeUL = deleted + * + * Layout 3 (DUK_USE_HOBJECT_LAYOUT_3): + * + * e_size * sizeof(duk_propvalue) bytes of entry values (e_next gc reachable) + * a_size * sizeof(duk_tval) bytes of (opt) array values (plain only) (all gc reachable) + * e_size * sizeof(duk_hstring *) bytes of entry keys (e_next gc reachable) + * h_size * sizeof(duk_uint32_t) bytes of (opt) hash indexes to entries (e_size), + * 0xffffffffUL = unused, 0xfffffffeUL = deleted + * e_size * sizeof(duk_uint8_t) bytes of entry flags (e_next gc reachable) + * + * In layout 1, the 'e_next' count is rounded to 4 or 8 on platforms + * requiring 4 or 8 byte alignment. This ensures proper alignment + * for the entries, at the cost of memory footprint. However, it's + * probably preferable to use another layout on such platforms instead. + * + * In layout 2, the key and value parts are swapped to avoid padding + * the key array on platforms requiring alignment by 8. The flags part + * is padded to get alignment for array entries. The 'e_next' count does + * not need to be rounded as in layout 1. + * + * In layout 3, entry values and array values are always aligned properly, + * and assuming pointers are at most 8 bytes, so are the entry keys. Hash + * indices will be properly aligned (assuming pointers are at least 4 bytes). + * Finally, flags don't need additional alignment. This layout provides + * compact allocations without padding (even on platforms with alignment + * requirements) at the cost of a bit slower lookups. + * + * Objects with few keys don't have a hash index; keys are looked up linearly, + * which is cache efficient because the keys are consecutive. Larger objects + * have a hash index part which contains integer indexes to the entries part. + * + * A single allocation reduces memory allocation overhead but requires more + * work when any part needs to be resized. A sliced allocation for entries + * makes linear key matching faster on most platforms (more locality) and + * skimps on flags size (which would be followed by 3 bytes of padding in + * most architectures if entries were placed in a struct). + * + * 'props' also contains internal properties distinguished with a non-BMP + * prefix. Often used properties should be placed early in 'props' whenever + * possible to make accessing them as fast a possible. + */ + +#if defined(DUK_USE_HEAPPTR16) + /* Located in duk_heaphdr h_extra16. Subclasses of duk_hobject (like + * duk_hcompfunc) are not free to use h_extra16 for this reason. + */ +#else + duk_uint8_t *props; +#endif + + /* prototype: the only internal property lifted outside 'e' as it is so central */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t prototype16; +#else + duk_hobject *prototype; +#endif + +#if defined(DUK_USE_OBJSIZES16) + duk_uint16_t e_size16; + duk_uint16_t e_next16; + duk_uint16_t a_size16; +#if defined(DUK_USE_HOBJECT_HASH_PART) + duk_uint16_t h_size16; +#endif +#else + duk_uint32_t e_size; /* entry part size */ + duk_uint32_t e_next; /* index for next new key ([0,e_next[ are gc reachable) */ + duk_uint32_t a_size; /* array part size (entirely gc reachable) */ +#if defined(DUK_USE_HOBJECT_HASH_PART) + duk_uint32_t h_size; /* hash part size or 0 if unused */ +#endif +#endif +}; + +/* + * Exposed data + */ + +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL duk_uint8_t duk_class_number_to_stridx[32]; +#endif /* !DUK_SINGLE_FILE */ + +/* + * Prototypes + */ + +/* alloc and init */ +DUK_INTERNAL_DECL duk_hobject *duk_hobject_alloc_unchecked(duk_heap *heap, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hobject *duk_hobject_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_harray *duk_harray_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hcompfunc *duk_hcompfunc_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hnatfunc *duk_hnatfunc_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hboundfunc *duk_hboundfunc_alloc(duk_heap *heap, duk_uint_t hobject_flags); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL_DECL duk_hbufobj *duk_hbufobj_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +#endif +DUK_INTERNAL_DECL duk_hthread *duk_hthread_alloc_unchecked(duk_heap *heap, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hthread *duk_hthread_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hdecenv *duk_hdecenv_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hobjenv *duk_hobjenv_alloc(duk_hthread *thr, duk_uint_t hobject_flags); +DUK_INTERNAL_DECL duk_hproxy *duk_hproxy_alloc(duk_hthread *thr, duk_uint_t hobject_flags); + +/* resize */ +DUK_INTERNAL_DECL void duk_hobject_realloc_props(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t new_e_size, + duk_uint32_t new_a_size, + duk_uint32_t new_h_size, + duk_bool_t abandon_array); +DUK_INTERNAL_DECL void duk_hobject_resize_entrypart(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t new_e_size); +#if 0 /*unused*/ +DUK_INTERNAL_DECL void duk_hobject_resize_arraypart(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t new_a_size); +#endif + +/* low-level property functions */ +DUK_INTERNAL_DECL duk_bool_t duk_hobject_find_existing_entry(duk_heap *heap, duk_hobject *obj, duk_hstring *key, duk_int_t *e_idx, duk_int_t *h_idx); +DUK_INTERNAL_DECL duk_tval *duk_hobject_find_existing_entry_tval_ptr(duk_heap *heap, duk_hobject *obj, duk_hstring *key); +DUK_INTERNAL_DECL duk_tval *duk_hobject_find_existing_entry_tval_ptr_and_attrs(duk_heap *heap, duk_hobject *obj, duk_hstring *key, duk_uint_t *out_attrs); +DUK_INTERNAL_DECL duk_tval *duk_hobject_find_existing_array_entry_tval_ptr(duk_heap *heap, duk_hobject *obj, duk_uarridx_t i); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_get_own_propdesc(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *out_desc, duk_small_uint_t flags); + +/* XXX: when optimizing for guaranteed property slots, use a guaranteed + * slot for internal value; this call can then access it directly. + */ +#define duk_hobject_get_internal_value_tval_ptr(heap,obj) \ + duk_hobject_find_existing_entry_tval_ptr((heap), (obj), DUK_HEAP_STRING_INT_VALUE((heap))) + +/* core property functions */ +DUK_INTERNAL_DECL duk_bool_t duk_hobject_getprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_putprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key, duk_tval *tv_val, duk_bool_t throw_flag); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_delprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key, duk_bool_t throw_flag); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_hasprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key); + +/* internal property functions */ +#define DUK_DELPROP_FLAG_THROW (1U << 0) +#define DUK_DELPROP_FLAG_FORCE (1U << 1) +DUK_INTERNAL_DECL duk_bool_t duk_hobject_delprop_raw(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_small_uint_t flags); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_hasprop_raw(duk_hthread *thr, duk_hobject *obj, duk_hstring *key); +DUK_INTERNAL_DECL void duk_hobject_define_property_internal(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_small_uint_t flags); +DUK_INTERNAL_DECL void duk_hobject_define_property_internal_arridx(duk_hthread *thr, duk_hobject *obj, duk_uarridx_t arr_idx, duk_small_uint_t flags); +DUK_INTERNAL_DECL duk_size_t duk_hobject_get_length(duk_hthread *thr, duk_hobject *obj); +#if defined(DUK_USE_HEAPPTR16) +DUK_INTERNAL_DECL duk_bool_t duk_hobject_has_finalizer_fast_raw(duk_heap *heap, duk_hobject *obj); +#else +DUK_INTERNAL_DECL duk_bool_t duk_hobject_has_finalizer_fast_raw(duk_hobject *obj); +#endif + +/* helpers for defineProperty() and defineProperties() */ +DUK_INTERNAL_DECL void duk_hobject_prepare_property_descriptor(duk_hthread *thr, + duk_idx_t idx_in, + duk_uint_t *out_defprop_flags, + duk_idx_t *out_idx_value, + duk_hobject **out_getter, + duk_hobject **out_setter); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_define_property_helper(duk_hthread *thr, + duk_uint_t defprop_flags, + duk_hobject *obj, + duk_hstring *key, + duk_idx_t idx_value, + duk_hobject *get, + duk_hobject *set, + duk_bool_t throw_flag); + +/* Object built-in methods */ +DUK_INTERNAL_DECL void duk_hobject_object_get_own_property_descriptor(duk_hthread *thr, duk_idx_t obj_idx); +DUK_INTERNAL_DECL void duk_hobject_object_seal_freeze_helper(duk_hthread *thr, duk_hobject *obj, duk_bool_t is_freeze); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_object_is_sealed_frozen_helper(duk_hthread *thr, duk_hobject *obj, duk_bool_t is_frozen); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_object_ownprop_helper(duk_hthread *thr, duk_small_uint_t required_desc_flags); + +/* internal properties */ +DUK_INTERNAL_DECL duk_bool_t duk_hobject_get_internal_value(duk_heap *heap, duk_hobject *obj, duk_tval *tv); +DUK_INTERNAL_DECL duk_hstring *duk_hobject_get_internal_value_string(duk_heap *heap, duk_hobject *obj); + +/* hobject management functions */ +DUK_INTERNAL_DECL void duk_hobject_compact_props(duk_hthread *thr, duk_hobject *obj); + +/* ES2015 proxy */ +#if defined(DUK_USE_ES6_PROXY) +DUK_INTERNAL_DECL duk_bool_t duk_hobject_proxy_check(duk_hobject *obj, duk_hobject **out_target, duk_hobject **out_handler); +DUK_INTERNAL_DECL duk_hobject *duk_hobject_resolve_proxy_target(duk_hobject *obj); +#endif + +/* enumeration */ +DUK_INTERNAL_DECL void duk_hobject_enumerator_create(duk_hthread *thr, duk_small_uint_t enum_flags); +DUK_INTERNAL_DECL duk_ret_t duk_hobject_get_enumerated_keys(duk_hthread *thr, duk_small_uint_t enum_flags); +DUK_INTERNAL_DECL duk_bool_t duk_hobject_enumerator_next(duk_hthread *thr, duk_bool_t get_value); + +/* macros */ +DUK_INTERNAL_DECL void duk_hobject_set_prototype_updref(duk_hthread *thr, duk_hobject *h, duk_hobject *p); + +/* pc2line */ +#if defined(DUK_USE_PC2LINE) +DUK_INTERNAL_DECL void duk_hobject_pc2line_pack(duk_hthread *thr, duk_compiler_instr *instrs, duk_uint_fast32_t length); +DUK_INTERNAL_DECL duk_uint_fast32_t duk_hobject_pc2line_query(duk_hthread *thr, duk_idx_t idx_func, duk_uint_fast32_t pc); +#endif + +/* misc */ +DUK_INTERNAL_DECL duk_bool_t duk_hobject_prototype_chain_contains(duk_hthread *thr, duk_hobject *h, duk_hobject *p, duk_bool_t ignore_loop); + +#if !defined(DUK_USE_OBJECT_BUILTIN) +/* These declarations are needed when related built-in is disabled and + * genbuiltins.py won't automatically emit the declerations. + */ +DUK_INTERNAL_DECL duk_ret_t duk_bi_object_prototype_to_string(duk_hthread *thr); +DUK_INTERNAL_DECL duk_ret_t duk_bi_function_prototype(duk_hthread *thr); +#endif + +#endif /* DUK_HOBJECT_H_INCLUDED */ +/* #include duk_hcompfunc.h */ +#line 1 "duk_hcompfunc.h" +/* + * Heap compiled function (ECMAScript function) representation. + * + * There is a single data buffer containing the ECMAScript function's + * bytecode, constants, and inner functions. + */ + +#if !defined(DUK_HCOMPFUNC_H_INCLUDED) +#define DUK_HCOMPFUNC_H_INCLUDED + +/* + * Field accessor macros + */ + +/* XXX: casts could be improved, especially for GET/SET DATA */ + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HCOMPFUNC_GET_DATA(heap,h) \ + ((duk_hbuffer_fixed *) (void *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->data16)) +#define DUK_HCOMPFUNC_SET_DATA(heap,h,v) do { \ + (h)->data16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HCOMPFUNC_GET_FUNCS(heap,h) \ + ((duk_hobject **) (void *) (DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->funcs16))) +#define DUK_HCOMPFUNC_SET_FUNCS(heap,h,v) do { \ + (h)->funcs16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HCOMPFUNC_GET_BYTECODE(heap,h) \ + ((duk_instr_t *) (void *) (DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->bytecode16))) +#define DUK_HCOMPFUNC_SET_BYTECODE(heap,h,v) do { \ + (h)->bytecode16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HCOMPFUNC_GET_LEXENV(heap,h) \ + ((duk_hobject *) (void *) (DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->lex_env16))) +#define DUK_HCOMPFUNC_SET_LEXENV(heap,h,v) do { \ + (h)->lex_env16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HCOMPFUNC_GET_VARENV(heap,h) \ + ((duk_hobject *) (void *) (DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->var_env16))) +#define DUK_HCOMPFUNC_SET_VARENV(heap,h,v) do { \ + (h)->var_env16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#else +#define DUK_HCOMPFUNC_GET_DATA(heap,h) ((duk_hbuffer_fixed *) (void *) (h)->data) +#define DUK_HCOMPFUNC_SET_DATA(heap,h,v) do { \ + (h)->data = (duk_hbuffer *) (v); \ + } while (0) +#define DUK_HCOMPFUNC_GET_FUNCS(heap,h) ((h)->funcs) +#define DUK_HCOMPFUNC_SET_FUNCS(heap,h,v) do { \ + (h)->funcs = (v); \ + } while (0) +#define DUK_HCOMPFUNC_GET_BYTECODE(heap,h) ((h)->bytecode) +#define DUK_HCOMPFUNC_SET_BYTECODE(heap,h,v) do { \ + (h)->bytecode = (v); \ + } while (0) +#define DUK_HCOMPFUNC_GET_LEXENV(heap,h) ((h)->lex_env) +#define DUK_HCOMPFUNC_SET_LEXENV(heap,h,v) do { \ + (h)->lex_env = (v); \ + } while (0) +#define DUK_HCOMPFUNC_GET_VARENV(heap,h) ((h)->var_env) +#define DUK_HCOMPFUNC_SET_VARENV(heap,h,v) do { \ + (h)->var_env = (v); \ + } while (0) +#endif + +/* + * Accessor macros for function specific data areas + */ + +/* Note: assumes 'data' is always a fixed buffer */ +#define DUK_HCOMPFUNC_GET_BUFFER_BASE(heap,h) \ + DUK_HBUFFER_FIXED_GET_DATA_PTR((heap), DUK_HCOMPFUNC_GET_DATA((heap), (h))) + +#define DUK_HCOMPFUNC_GET_CONSTS_BASE(heap,h) \ + ((duk_tval *) (void *) DUK_HCOMPFUNC_GET_BUFFER_BASE((heap), (h))) + +#define DUK_HCOMPFUNC_GET_FUNCS_BASE(heap,h) \ + DUK_HCOMPFUNC_GET_FUNCS((heap), (h)) + +#define DUK_HCOMPFUNC_GET_CODE_BASE(heap,h) \ + DUK_HCOMPFUNC_GET_BYTECODE((heap), (h)) + +#define DUK_HCOMPFUNC_GET_CONSTS_END(heap,h) \ + ((duk_tval *) (void *) DUK_HCOMPFUNC_GET_FUNCS((heap), (h))) + +#define DUK_HCOMPFUNC_GET_FUNCS_END(heap,h) \ + ((duk_hobject **) (void *) DUK_HCOMPFUNC_GET_BYTECODE((heap), (h))) + +/* XXX: double evaluation of DUK_HCOMPFUNC_GET_DATA() */ +#define DUK_HCOMPFUNC_GET_CODE_END(heap,h) \ + ((duk_instr_t *) (void *) (DUK_HBUFFER_FIXED_GET_DATA_PTR((heap), DUK_HCOMPFUNC_GET_DATA((heap), (h))) + \ + DUK_HBUFFER_GET_SIZE((duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA((heap), h)))) + +#define DUK_HCOMPFUNC_GET_CONSTS_SIZE(heap,h) \ + ( \ + (duk_size_t) \ + ( \ + ((const duk_uint8_t *) DUK_HCOMPFUNC_GET_CONSTS_END((heap), (h))) - \ + ((const duk_uint8_t *) DUK_HCOMPFUNC_GET_CONSTS_BASE((heap), (h))) \ + ) \ + ) + +#define DUK_HCOMPFUNC_GET_FUNCS_SIZE(heap,h) \ + ( \ + (duk_size_t) \ + ( \ + ((const duk_uint8_t *) DUK_HCOMPFUNC_GET_FUNCS_END((heap), (h))) - \ + ((const duk_uint8_t *) DUK_HCOMPFUNC_GET_FUNCS_BASE((heap), (h))) \ + ) \ + ) + +#define DUK_HCOMPFUNC_GET_CODE_SIZE(heap,h) \ + ( \ + (duk_size_t) \ + ( \ + ((const duk_uint8_t *) DUK_HCOMPFUNC_GET_CODE_END((heap),(h))) - \ + ((const duk_uint8_t *) DUK_HCOMPFUNC_GET_CODE_BASE((heap),(h))) \ + ) \ + ) + +#define DUK_HCOMPFUNC_GET_CONSTS_COUNT(heap,h) \ + ((duk_size_t) (DUK_HCOMPFUNC_GET_CONSTS_SIZE((heap), (h)) / sizeof(duk_tval))) + +#define DUK_HCOMPFUNC_GET_FUNCS_COUNT(heap,h) \ + ((duk_size_t) (DUK_HCOMPFUNC_GET_FUNCS_SIZE((heap), (h)) / sizeof(duk_hobject *))) + +#define DUK_HCOMPFUNC_GET_CODE_COUNT(heap,h) \ + ((duk_size_t) (DUK_HCOMPFUNC_GET_CODE_SIZE((heap), (h)) / sizeof(duk_instr_t))) + +/* + * Validity assert + */ + +#define DUK_ASSERT_HCOMPFUNC_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + } while (0) + +/* + * Main struct + */ + +struct duk_hcompfunc { + /* shared object part */ + duk_hobject obj; + + /* + * Pointers to function data area for faster access. Function + * data is a buffer shared between all closures of the same + * "template" function. The data buffer is always fixed (non- + * dynamic, hence stable), with a layout as follows: + * + * constants (duk_tval) + * inner functions (duk_hobject *) + * bytecode (duk_instr_t) + * + * Note: bytecode end address can be computed from 'data' buffer + * size. It is not strictly necessary functionally, assuming + * bytecode never jumps outside its allocated area. However, + * it's a safety/robustness feature for avoiding the chance of + * executing random data as bytecode due to a compiler error. + * + * Note: values in the data buffer must be incref'd (they will + * be decref'd on release) for every compiledfunction referring + * to the 'data' element. + */ + + /* Data area, fixed allocation, stable data ptrs. */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t data16; +#else + duk_hbuffer *data; +#endif + + /* No need for constants pointer (= same as data). + * + * When using 16-bit packing alignment to 4 is nice. 'funcs' will be + * 4-byte aligned because 'constants' are duk_tvals. For now the + * inner function pointers are not compressed, so that 'bytecode' will + * also be 4-byte aligned. + */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t funcs16; + duk_uint16_t bytecode16; +#else + duk_hobject **funcs; + duk_instr_t *bytecode; +#endif + + /* Lexenv: lexical environment of closure, NULL for templates. + * Varenv: variable environment of closure, NULL for templates. + */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t lex_env16; + duk_uint16_t var_env16; +#else + duk_hobject *lex_env; + duk_hobject *var_env; +#endif + + /* + * 'nregs' registers are allocated on function entry, at most 'nargs' + * are initialized to arguments, and the rest to undefined. Arguments + * above 'nregs' are not mapped to registers. All registers in the + * active stack range must be initialized because they are GC reachable. + * 'nargs' is needed so that if the function is given more than 'nargs' + * arguments, the additional arguments do not 'clobber' registers + * beyond 'nregs' which must be consistently initialized to undefined. + * + * Usually there is no need to know which registers are mapped to + * local variables. Registers may be allocated to variable in any + * way (even including gaps). However, a register-variable mapping + * must be the same for the duration of the function execution and + * the register cannot be used for anything else. + * + * When looking up variables by name, the '_Varmap' map is used. + * When an activation closes, registers mapped to arguments are + * copied into the environment record based on the same map. The + * reverse map (from register to variable) is not currently needed + * at run time, except for debugging, so it is not maintained. + */ + + duk_uint16_t nregs; /* regs to allocate */ + duk_uint16_t nargs; /* number of arguments allocated to regs */ + + /* + * Additional control information is placed into the object itself + * as internal properties to avoid unnecessary fields for the + * majority of functions. The compiler tries to omit internal + * control fields when possible. + * + * Function templates: + * + * { + * name: "func", // declaration, named function expressions + * fileName: <debug info for creating nice errors> + * _Varmap: { "arg1": 0, "arg2": 1, "varname": 2 }, + * _Formals: [ "arg1", "arg2" ], + * _Source: "function func(arg1, arg2) { ... }", + * _Pc2line: <debug info for pc-to-line mapping>, + * } + * + * Function instances: + * + * { + * length: 2, + * prototype: { constructor: <func> }, + * caller: <thrower>, + * arguments: <thrower>, + * name: "func", // declaration, named function expressions + * fileName: <debug info for creating nice errors> + * _Varmap: { "arg1": 0, "arg2": 1, "varname": 2 }, + * _Formals: [ "arg1", "arg2" ], + * _Source: "function func(arg1, arg2) { ... }", + * _Pc2line: <debug info for pc-to-line mapping>, + * } + * + * More detailed description of these properties can be found + * in the documentation. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + /* Line number range for function. Needed during debugging to + * determine active breakpoints. + */ + duk_uint32_t start_line; + duk_uint32_t end_line; +#endif +}; + +#endif /* DUK_HCOMPFUNC_H_INCLUDED */ +/* #include duk_hnatfunc.h */ +#line 1 "duk_hnatfunc.h" +/* + * Heap native function representation. + */ + +#if !defined(DUK_HNATFUNC_H_INCLUDED) +#define DUK_HNATFUNC_H_INCLUDED + +#define DUK_HNATFUNC_NARGS_VARARGS ((duk_int16_t) -1) +#define DUK_HNATFUNC_NARGS_MAX ((duk_int16_t) 0x7fff) + +struct duk_hnatfunc { + /* shared object part */ + duk_hobject obj; + + duk_c_function func; + duk_int16_t nargs; + duk_int16_t magic; + + /* The 'magic' field allows an opaque 16-bit field to be accessed by the + * Duktape/C function. This allows, for instance, the same native function + * to be used for a set of very similar functions, with the 'magic' field + * providing the necessary non-argument flags / values to guide the behavior + * of the native function. The value is signed on purpose: it is easier to + * convert a signed value to unsigned (simply AND with 0xffff) than vice + * versa. + * + * Note: cannot place nargs/magic into the heaphdr flags, because + * duk_hobject takes almost all flags already. + */ +}; + +#endif /* DUK_HNATFUNC_H_INCLUDED */ +/* #include duk_hboundfunc.h */ +#line 1 "duk_hboundfunc.h" +/* + * Bound function representation. + */ + +#if !defined(DUK_HBOUNDFUNC_H_INCLUDED) +#define DUK_HBOUNDFUNC_H_INCLUDED + +/* Artificial limit for args length. Ensures arithmetic won't overflow + * 32 bits when combining bound functions. + */ +#define DUK_HBOUNDFUNC_MAX_ARGS 0x20000000UL + +#define DUK_ASSERT_HBOUNDFUNC_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT(DUK_HOBJECT_IS_BOUNDFUNC((duk_hobject *) (h))); \ + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(&(h)->target) || \ + (DUK_TVAL_IS_OBJECT(&(h)->target) && \ + DUK_HOBJECT_IS_CALLABLE(DUK_TVAL_GET_OBJECT(&(h)->target)))); \ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(&(h)->this_binding)); \ + DUK_ASSERT((h)->nargs == 0 || (h)->args != NULL); \ + } while (0) + +struct duk_hboundfunc { + /* Shared object part. */ + duk_hobject obj; + + /* Final target function, stored as duk_tval so that lightfunc can be + * represented too. + */ + duk_tval target; + + /* This binding. */ + duk_tval this_binding; + + /* Arguments to prepend. */ + duk_tval *args; /* Separate allocation. */ + duk_idx_t nargs; +}; + +#endif /* DUK_HBOUNDFUNC_H_INCLUDED */ +/* #include duk_hbufobj.h */ +#line 1 "duk_hbufobj.h" +/* + * Heap Buffer object representation. Used for all Buffer variants. + */ + +#if !defined(DUK_HBUFOBJ_H_INCLUDED) +#define DUK_HBUFOBJ_H_INCLUDED + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + +/* All element accessors are host endian now (driven by TypedArray spec). */ +#define DUK_HBUFOBJ_ELEM_UINT8 0 +#define DUK_HBUFOBJ_ELEM_UINT8CLAMPED 1 +#define DUK_HBUFOBJ_ELEM_INT8 2 +#define DUK_HBUFOBJ_ELEM_UINT16 3 +#define DUK_HBUFOBJ_ELEM_INT16 4 +#define DUK_HBUFOBJ_ELEM_UINT32 5 +#define DUK_HBUFOBJ_ELEM_INT32 6 +#define DUK_HBUFOBJ_ELEM_FLOAT32 7 +#define DUK_HBUFOBJ_ELEM_FLOAT64 8 +#define DUK_HBUFOBJ_ELEM_MAX 8 + +#define DUK_ASSERT_HBUFOBJ_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT((h)->shift <= 3); \ + DUK_ASSERT((h)->elem_type <= DUK_HBUFOBJ_ELEM_MAX); \ + DUK_ASSERT(((h)->shift == 0 && (h)->elem_type == DUK_HBUFOBJ_ELEM_UINT8) || \ + ((h)->shift == 0 && (h)->elem_type == DUK_HBUFOBJ_ELEM_UINT8CLAMPED) || \ + ((h)->shift == 0 && (h)->elem_type == DUK_HBUFOBJ_ELEM_INT8) || \ + ((h)->shift == 1 && (h)->elem_type == DUK_HBUFOBJ_ELEM_UINT16) || \ + ((h)->shift == 1 && (h)->elem_type == DUK_HBUFOBJ_ELEM_INT16) || \ + ((h)->shift == 2 && (h)->elem_type == DUK_HBUFOBJ_ELEM_UINT32) || \ + ((h)->shift == 2 && (h)->elem_type == DUK_HBUFOBJ_ELEM_INT32) || \ + ((h)->shift == 2 && (h)->elem_type == DUK_HBUFOBJ_ELEM_FLOAT32) || \ + ((h)->shift == 3 && (h)->elem_type == DUK_HBUFOBJ_ELEM_FLOAT64)); \ + DUK_ASSERT((h)->is_typedarray == 0 || (h)->is_typedarray == 1); \ + DUK_ASSERT(DUK_HOBJECT_IS_BUFOBJ((duk_hobject *) (h))); \ + if ((h)->buf == NULL) { \ + DUK_ASSERT((h)->offset == 0); \ + DUK_ASSERT((h)->length == 0); \ + } else { \ + /* No assertions for offset or length; in particular, \ + * it's OK for length to be longer than underlying \ + * buffer. Just ensure they don't wrap when added. \ + */ \ + DUK_ASSERT((h)->offset + (h)->length >= (h)->offset); \ + } \ + } while (0) + +/* Get the current data pointer (caller must ensure buf != NULL) as a + * duk_uint8_t ptr. Note that the result may be NULL if the underlying + * buffer has zero size and is not a fixed buffer. + */ +#define DUK_HBUFOBJ_GET_SLICE_BASE(heap,h) \ + (DUK_ASSERT_EXPR((h) != NULL), DUK_ASSERT_EXPR((h)->buf != NULL), \ + (((duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR((heap), (h)->buf)) + (h)->offset)) + +/* True if slice is full, i.e. offset is zero and length covers the entire + * buffer. This status may change independently of the duk_hbufobj if + * the underlying buffer is dynamic and changes without the hbufobj + * being changed. + */ +#define DUK_HBUFOBJ_FULL_SLICE(h) \ + (DUK_ASSERT_EXPR((h) != NULL), DUK_ASSERT_EXPR((h)->buf != NULL), \ + ((h)->offset == 0 && (h)->length == DUK_HBUFFER_GET_SIZE((h)->buf))) + +/* Validate that the whole slice [0,length[ is contained in the underlying + * buffer. Caller must ensure 'buf' != NULL. + */ +#define DUK_HBUFOBJ_VALID_SLICE(h) \ + (DUK_ASSERT_EXPR((h) != NULL), DUK_ASSERT_EXPR((h)->buf != NULL), \ + ((h)->offset + (h)->length <= DUK_HBUFFER_GET_SIZE((h)->buf))) + +/* Validate byte read/write for virtual 'offset', i.e. check that the + * offset, taking into account h->offset, is within the underlying + * buffer size. This is a safety check which is needed to ensure + * that even a misconfigured duk_hbufobj never causes memory unsafe + * behavior (e.g. if an underlying dynamic buffer changes after being + * setup). Caller must ensure 'buf' != NULL. + */ +#define DUK_HBUFOBJ_VALID_BYTEOFFSET_INCL(h,off) \ + (DUK_ASSERT_EXPR((h) != NULL), DUK_ASSERT_EXPR((h)->buf != NULL), \ + ((h)->offset + (off) < DUK_HBUFFER_GET_SIZE((h)->buf))) + +#define DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h,off) \ + (DUK_ASSERT_EXPR((h) != NULL), DUK_ASSERT_EXPR((h)->buf != NULL), \ + ((h)->offset + (off) <= DUK_HBUFFER_GET_SIZE((h)->buf))) + +/* Clamp an input byte length (already assumed to be within the nominal + * duk_hbufobj 'length') to the current dynamic buffer limits to yield + * a byte length limit that's safe for memory accesses. This value can + * be invalidated by any side effect because it may trigger a user + * callback that resizes the underlying buffer. + */ +#define DUK_HBUFOBJ_CLAMP_BYTELENGTH(h,len) \ + (DUK_ASSERT_EXPR((h) != NULL), \ + duk_hbufobj_clamp_bytelength((h), (len))) + +/* Typed arrays have virtual indices, ArrayBuffer and DataView do not. */ +#define DUK_HBUFOBJ_HAS_VIRTUAL_INDICES(h) ((h)->is_typedarray) + +struct duk_hbufobj { + /* Shared object part. */ + duk_hobject obj; + + /* Underlying buffer (refcounted), may be NULL. */ + duk_hbuffer *buf; + + /* .buffer reference to an ArrayBuffer, may be NULL. */ + duk_hobject *buf_prop; + + /* Slice and accessor information. + * + * Because the underlying buffer may be dynamic, these may be + * invalidated by the buffer being modified so that both offset + * and length should be validated before every access. Behavior + * when the underlying buffer has changed doesn't need to be clean: + * virtual 'length' doesn't need to be affected, reads can return + * zero/NaN, and writes can be ignored. + * + * Note that a data pointer cannot be precomputed because 'buf' may + * be dynamic and its pointer unstable. + */ + + duk_uint_t offset; /* byte offset to buf */ + duk_uint_t length; /* byte index limit for element access, exclusive */ + duk_uint8_t shift; /* element size shift: + * 0 = u8/i8 + * 1 = u16/i16 + * 2 = u32/i32/float + * 3 = double + */ + duk_uint8_t elem_type; /* element type */ + duk_uint8_t is_typedarray; +}; + +DUK_INTERNAL_DECL duk_uint_t duk_hbufobj_clamp_bytelength(duk_hbufobj *h_bufobj, duk_uint_t len); +DUK_INTERNAL_DECL void duk_hbufobj_push_uint8array_from_plain(duk_hthread *thr, duk_hbuffer *h_buf); +DUK_INTERNAL_DECL void duk_hbufobj_push_validated_read(duk_hthread *thr, duk_hbufobj *h_bufobj, duk_uint8_t *p, duk_small_uint_t elem_size); +DUK_INTERNAL_DECL void duk_hbufobj_validated_write(duk_hthread *thr, duk_hbufobj *h_bufobj, duk_uint8_t *p, duk_small_uint_t elem_size); +DUK_INTERNAL_DECL void duk_hbufobj_promote_plain(duk_hthread *thr, duk_idx_t idx); + +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ +#endif /* DUK_HBUFOBJ_H_INCLUDED */ +/* #include duk_hthread.h */ +#line 1 "duk_hthread.h" +/* + * Heap thread object representation. + * + * duk_hthread is also the 'context' for public API functions via a + * different typedef. Most API calls operate on the topmost frame + * of the value stack only. + */ + +#if !defined(DUK_HTHREAD_H_INCLUDED) +#define DUK_HTHREAD_H_INCLUDED + +/* + * Stack constants + */ + +/* Initial valstack size, roughly 0.7kiB. */ +#define DUK_VALSTACK_INITIAL_SIZE 96U + +/* Internal extra elements assumed on function entry, always added to + * user-defined 'extra' for e.g. the duk_check_stack() call. + */ +#define DUK_VALSTACK_INTERNAL_EXTRA 32U + +/* Number of elements guaranteed to be user accessible (in addition to call + * arguments) on Duktape/C function entry. This is the major public API + * commitment. + */ +#define DUK_VALSTACK_API_ENTRY_MINIMUM DUK_API_ENTRY_STACK + +/* + * Activation defines + */ + +#define DUK_ACT_FLAG_STRICT (1U << 0) /* function executes in strict mode */ +#define DUK_ACT_FLAG_TAILCALLED (1U << 1) /* activation has tail called one or more times */ +#define DUK_ACT_FLAG_CONSTRUCT (1U << 2) /* function executes as a constructor (called via "new") */ +#define DUK_ACT_FLAG_PREVENT_YIELD (1U << 3) /* activation prevents yield (native call or "new") */ +#define DUK_ACT_FLAG_DIRECT_EVAL (1U << 4) /* activation is a direct eval call */ +#define DUK_ACT_FLAG_CONSTRUCT_PROXY (1U << 5) /* activation is for Proxy 'construct' call, special return value handling */ +#define DUK_ACT_FLAG_BREAKPOINT_ACTIVE (1U << 6) /* activation has active breakpoint(s) */ + +#define DUK_ACT_GET_FUNC(act) ((act)->func) + +/* + * Flags for __FILE__ / __LINE__ registered into tracedata + */ + +#define DUK_TB_FLAG_NOBLAME_FILELINE (1U << 0) /* don't report __FILE__ / __LINE__ as fileName/lineNumber */ + +/* + * Catcher defines + */ + +/* XXX: remove catcher type entirely */ + +/* flags field: LLLLLLFT, L = label (24 bits), F = flags (4 bits), T = type (4 bits) */ +#define DUK_CAT_TYPE_MASK 0x0000000fUL +#define DUK_CAT_TYPE_BITS 4 +#define DUK_CAT_LABEL_MASK 0xffffff00UL +#define DUK_CAT_LABEL_BITS 24 +#define DUK_CAT_LABEL_SHIFT 8 + +#define DUK_CAT_FLAG_CATCH_ENABLED (1U << 4) /* catch part will catch */ +#define DUK_CAT_FLAG_FINALLY_ENABLED (1U << 5) /* finally part will catch */ +#define DUK_CAT_FLAG_CATCH_BINDING_ENABLED (1U << 6) /* request to create catch binding */ +#define DUK_CAT_FLAG_LEXENV_ACTIVE (1U << 7) /* catch or with binding is currently active */ + +#define DUK_CAT_TYPE_UNKNOWN 0 +#define DUK_CAT_TYPE_TCF 1 +#define DUK_CAT_TYPE_LABEL 2 + +#define DUK_CAT_GET_TYPE(c) ((c)->flags & DUK_CAT_TYPE_MASK) +#define DUK_CAT_GET_LABEL(c) (((c)->flags & DUK_CAT_LABEL_MASK) >> DUK_CAT_LABEL_SHIFT) + +#define DUK_CAT_HAS_CATCH_ENABLED(c) ((c)->flags & DUK_CAT_FLAG_CATCH_ENABLED) +#define DUK_CAT_HAS_FINALLY_ENABLED(c) ((c)->flags & DUK_CAT_FLAG_FINALLY_ENABLED) +#define DUK_CAT_HAS_CATCH_BINDING_ENABLED(c) ((c)->flags & DUK_CAT_FLAG_CATCH_BINDING_ENABLED) +#define DUK_CAT_HAS_LEXENV_ACTIVE(c) ((c)->flags & DUK_CAT_FLAG_LEXENV_ACTIVE) + +#define DUK_CAT_SET_CATCH_ENABLED(c) do { \ + (c)->flags |= DUK_CAT_FLAG_CATCH_ENABLED; \ + } while (0) +#define DUK_CAT_SET_FINALLY_ENABLED(c) do { \ + (c)->flags |= DUK_CAT_FLAG_FINALLY_ENABLED; \ + } while (0) +#define DUK_CAT_SET_CATCH_BINDING_ENABLED(c) do { \ + (c)->flags |= DUK_CAT_FLAG_CATCH_BINDING_ENABLED; \ + } while (0) +#define DUK_CAT_SET_LEXENV_ACTIVE(c) do { \ + (c)->flags |= DUK_CAT_FLAG_LEXENV_ACTIVE; \ + } while (0) + +#define DUK_CAT_CLEAR_CATCH_ENABLED(c) do { \ + (c)->flags &= ~DUK_CAT_FLAG_CATCH_ENABLED; \ + } while (0) +#define DUK_CAT_CLEAR_FINALLY_ENABLED(c) do { \ + (c)->flags &= ~DUK_CAT_FLAG_FINALLY_ENABLED; \ + } while (0) +#define DUK_CAT_CLEAR_CATCH_BINDING_ENABLED(c) do { \ + (c)->flags &= ~DUK_CAT_FLAG_CATCH_BINDING_ENABLED; \ + } while (0) +#define DUK_CAT_CLEAR_LEXENV_ACTIVE(c) do { \ + (c)->flags &= ~DUK_CAT_FLAG_LEXENV_ACTIVE; \ + } while (0) + +/* + * Thread defines + */ + +#if defined(DUK_USE_ROM_STRINGS) +#define DUK_HTHREAD_GET_STRING(thr,idx) \ + ((duk_hstring *) DUK_LOSE_CONST(duk_rom_strings_stridx[(idx)])) +#else /* DUK_USE_ROM_STRINGS */ +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HTHREAD_GET_STRING(thr,idx) \ + ((duk_hstring *) DUK_USE_HEAPPTR_DEC16((thr)->heap->heap_udata, (thr)->strs16[(idx)])) +#else +#define DUK_HTHREAD_GET_STRING(thr,idx) \ + ((thr)->strs[(idx)]) +#endif +#endif /* DUK_USE_ROM_STRINGS */ + +/* values for the state field */ +#define DUK_HTHREAD_STATE_INACTIVE 1 /* thread not currently running */ +#define DUK_HTHREAD_STATE_RUNNING 2 /* thread currently running (only one at a time) */ +#define DUK_HTHREAD_STATE_RESUMED 3 /* thread resumed another thread (active but not running) */ +#define DUK_HTHREAD_STATE_YIELDED 4 /* thread has yielded */ +#define DUK_HTHREAD_STATE_TERMINATED 5 /* thread has terminated */ + +/* Executor interrupt default interval when nothing else requires a + * smaller value. The default interval must be small enough to allow + * for reasonable execution timeout checking but large enough to keep + * impact on execution performance low. + */ +#if defined(DUK_USE_INTERRUPT_COUNTER) +#define DUK_HTHREAD_INTCTR_DEFAULT (256L * 1024L) +#endif + +/* + * Assert context is valid: non-NULL pointer, fields look sane. + * + * This is used by public API call entrypoints to catch invalid 'ctx' pointers + * as early as possible; invalid 'ctx' pointers cause very odd and difficult to + * diagnose behavior so it's worth checking even when the check is not 100%. + */ + +/* Assertions for internals. */ +#define DUK_ASSERT_HTHREAD_VALID(thr) do { \ + DUK_ASSERT((thr) != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) (thr)) == DUK_HTYPE_OBJECT); \ + DUK_ASSERT(DUK_HOBJECT_IS_THREAD((duk_hobject *) (thr))); \ + DUK_ASSERT((thr)->unused1 == 0); \ + DUK_ASSERT((thr)->unused2 == 0); \ + } while (0) + +/* Assertions for public API calls; a bit stronger. */ +#define DUK_ASSERT_CTX_VALID(thr) do { \ + DUK_ASSERT((thr) != NULL); \ + DUK_ASSERT_HTHREAD_VALID((thr)); \ + DUK_ASSERT((thr)->valstack != NULL); \ + DUK_ASSERT((thr)->valstack_bottom != NULL); \ + DUK_ASSERT((thr)->valstack_top != NULL); \ + DUK_ASSERT((thr)->valstack_end != NULL); \ + DUK_ASSERT((thr)->valstack_alloc_end != NULL); \ + DUK_ASSERT((thr)->valstack_alloc_end >= (thr)->valstack); \ + DUK_ASSERT((thr)->valstack_end >= (thr)->valstack); \ + DUK_ASSERT((thr)->valstack_top >= (thr)->valstack); \ + DUK_ASSERT((thr)->valstack_top >= (thr)->valstack_bottom); \ + DUK_ASSERT((thr)->valstack_end >= (thr)->valstack_top); \ + DUK_ASSERT((thr)->valstack_alloc_end >= (thr)->valstack_end); \ + } while (0) + +/* Assertions for API call entry specifically. Checks 'ctx' but also may + * check internal state (e.g. not in a debugger transport callback). + */ +#define DUK_ASSERT_API_ENTRY(thr) do { \ + DUK_ASSERT_CTX_VALID((thr)); \ + DUK_ASSERT((thr)->heap != NULL); \ + DUK_ASSERT((thr)->heap->dbg_calling_transport == 0); \ + } while (0) + +/* + * Assertion helpers. + */ + +#define DUK_ASSERT_STRIDX_VALID(val) \ + DUK_ASSERT((duk_uint_t) (val) < DUK_HEAP_NUM_STRINGS) + +#define DUK_ASSERT_BIDX_VALID(val) \ + DUK_ASSERT((duk_uint_t) (val) < DUK_NUM_BUILTINS) + +/* + * Misc + */ + +/* Fast access to 'this' binding. Assumes there's a call in progress. */ +#define DUK_HTHREAD_THIS_PTR(thr) \ + (DUK_ASSERT_EXPR((thr) != NULL), \ + DUK_ASSERT_EXPR((thr)->valstack_bottom > (thr)->valstack), \ + (thr)->valstack_bottom - 1) + +/* + * Struct defines + */ + +/* Fields are ordered for alignment/packing. */ +struct duk_activation { + duk_tval tv_func; /* borrowed: full duk_tval for function being executed; for lightfuncs */ + duk_hobject *func; /* borrowed: function being executed; for bound function calls, this is the final, real function, NULL for lightfuncs */ + duk_activation *parent; /* previous (parent) activation (or NULL if none) */ + duk_hobject *var_env; /* current variable environment (may be NULL if delayed) */ + duk_hobject *lex_env; /* current lexical environment (may be NULL if delayed) */ + duk_catcher *cat; /* current catcher (or NULL) */ + +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + /* Previous value of 'func' caller, restored when unwound. Only in use + * when 'func' is non-strict. + */ + duk_hobject *prev_caller; +#endif + + duk_instr_t *curr_pc; /* next instruction to execute (points to 'func' bytecode, stable pointer), NULL for native calls */ + + /* bottom_byteoff and retval_byteoff are only used for book-keeping + * of ECMAScript-initiated calls, to allow returning to an ECMAScript + * function properly. + */ + + /* Bottom of valstack for this activation, used to reset + * valstack_bottom on return; offset is absolute. There's + * no need to track 'top' because native call handling deals + * with that using locals, and for ECMAScript returns 'nregs' + * indicates the necessary top. + */ + duk_size_t bottom_byteoff; + + /* Return value when returning to this activation (points to caller + * reg, not callee reg); offset is absolute (only set if activation is + * not topmost). + * + * Note: bottom_byteoff is always set, while retval_byteoff is only + * applicable for activations below the topmost one. Currently + * retval_byteoff for the topmost activation is considered garbage + * (and it not initialized on entry or cleared on return; may contain + * previous or garbage values). + */ + duk_size_t retval_byteoff; + + /* Current 'this' binding is the value just below bottom. + * Previously, 'this' binding was handled with an index to the + * (calling) valstack. This works for everything except tail + * calls, which must not "accumulate" valstack temps. + */ + + /* Value stack reserve (valstack_end) byte offset to be restored + * when returning to this activation. Only used by the bytecode + * executor. + */ + duk_size_t reserve_byteoff; + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_uint32_t prev_line; /* needed for stepping */ +#endif + + duk_small_uint_t flags; +}; + +struct duk_catcher { + duk_catcher *parent; /* previous (parent) catcher (or NULL if none) */ + duk_hstring *h_varname; /* borrowed reference to catch variable name (or NULL if none) */ + /* (reference is valid as long activation exists) */ + duk_instr_t *pc_base; /* resume execution from pc_base or pc_base+1 (points to 'func' bytecode, stable pointer) */ + duk_size_t idx_base; /* idx_base and idx_base+1 get completion value and type */ + duk_uint32_t flags; /* type and control flags, label number */ + /* XXX: could pack 'flags' and 'idx_base' to same value in practice, + * on 32-bit targets this would make duk_catcher 16 bytes. + */ +}; + +struct duk_hthread { + /* Shared object part */ + duk_hobject obj; + + /* Pointer to bytecode executor's 'curr_pc' variable. Used to copy + * the current PC back into the topmost activation when activation + * state is about to change (or "syncing" is otherwise needed). This + * is rather awkward but important for performance, see execution.rst. + */ + duk_instr_t **ptr_curr_pc; + + /* Backpointers. */ + duk_heap *heap; + + /* Current strictness flag: affects API calls. */ + duk_uint8_t strict; + + /* Thread state. */ + duk_uint8_t state; + duk_uint8_t unused1; + duk_uint8_t unused2; + + /* XXX: Valstack and callstack are currently assumed to have non-NULL + * pointers. Relaxing this would not lead to big benefits (except + * perhaps for terminated threads). + */ + + /* Value stack: these are expressed as pointers for faster stack + * manipulation. [valstack,valstack_top[ is GC-reachable, + * [valstack_top,valstack_alloc_end[ is not GC-reachable but kept + * initialized as 'undefined'. [valstack,valstack_end[ is the + * guaranteed/reserved space and the valstack cannot be resized to + * a smaller size. [valstack_end,valstack_alloc_end[ is currently + * allocated slack that can be used to grow the current guaranteed + * space but may be shrunk away without notice. + * + * + * <----------------------- guaranteed ---> + * <---- slack ---> + * <--- frame ---> + * .-------------+=============+----------+--------------. + * |xxxxxxxxxxxxx|yyyyyyyyyyyyy|uuuuuuuuuu|uuuuuuuuuuuuuu| + * `-------------+=============+----------+--------------' + * + * ^ ^ ^ ^ ^ + * | | | | | + * valstack bottom top end alloc_end + * + * xxx = arbitrary values, below current frame + * yyy = arbitrary values, inside current frame + * uuu = outside active value stack, initialized to 'undefined' + */ + duk_tval *valstack; /* start of valstack allocation */ + duk_tval *valstack_end; /* end of valstack reservation/guarantee (exclusive) */ + duk_tval *valstack_alloc_end; /* end of valstack allocation */ + duk_tval *valstack_bottom; /* bottom of current frame */ + duk_tval *valstack_top; /* top of current frame (exclusive) */ + + /* Call stack, represented as a linked list starting from the current + * activation (or NULL if nothing is active). + */ + duk_activation *callstack_curr; /* current activation (or NULL if none) */ + duk_size_t callstack_top; /* number of activation records in callstack (0 if none) */ + duk_size_t callstack_preventcount; /* number of activation records in callstack preventing a yield */ + + /* Yield/resume book-keeping. */ + duk_hthread *resumer; /* who resumed us (if any) */ + + /* Current compiler state (if any), used for augmenting SyntaxErrors. */ + duk_compiler_ctx *compile_ctx; + +#if defined(DUK_USE_INTERRUPT_COUNTER) + /* Interrupt counter for triggering a slow path check for execution + * timeout, debugger interaction such as breakpoints, etc. The value + * is valid for the current running thread, and both the init and + * counter values are copied whenever a thread switch occurs. It's + * important for the counter to be conveniently accessible for the + * bytecode executor inner loop for performance reasons. + */ + duk_int_t interrupt_counter; /* countdown state */ + duk_int_t interrupt_init; /* start value for current countdown */ +#endif + + /* Builtin-objects; may or may not be shared with other threads, + * threads existing in different "compartments" will have different + * built-ins. Must be stored on a per-thread basis because there + * is no intermediate structure for a thread group / compartment. + * This takes quite a lot of space, currently 43x4 = 172 bytes on + * 32-bit platforms. + * + * In some cases the builtins array could be ROM based, but it's + * sometimes edited (e.g. for sandboxing) so it's better to keep + * this array in RAM. + */ + duk_hobject *builtins[DUK_NUM_BUILTINS]; + + /* Convenience copies from heap/vm for faster access. */ +#if defined(DUK_USE_ROM_STRINGS) + /* No field needed when strings are in ROM. */ +#else +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t *strs16; +#else + duk_hstring **strs; +#endif +#endif +}; + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL void duk_hthread_copy_builtin_objects(duk_hthread *thr_from, duk_hthread *thr_to); +DUK_INTERNAL_DECL void duk_hthread_create_builtin_objects(duk_hthread *thr); +DUK_INTERNAL_DECL duk_bool_t duk_hthread_init_stacks(duk_heap *heap, duk_hthread *thr); +DUK_INTERNAL_DECL void duk_hthread_terminate(duk_hthread *thr); + +DUK_INTERNAL_DECL duk_activation *duk_hthread_activation_alloc(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_hthread_activation_free(duk_hthread *thr, duk_activation *act); +DUK_INTERNAL_DECL void duk_hthread_activation_unwind_norz(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_hthread_activation_unwind_reuse_norz(duk_hthread *thr); +DUK_INTERNAL_DECL duk_activation *duk_hthread_get_activation_for_level(duk_hthread *thr, duk_int_t level); + +DUK_INTERNAL_DECL duk_catcher *duk_hthread_catcher_alloc(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_hthread_catcher_free(duk_hthread *thr, duk_catcher *cat); +DUK_INTERNAL_DECL void duk_hthread_catcher_unwind_norz(duk_hthread *thr, duk_activation *act); +DUK_INTERNAL_DECL void duk_hthread_catcher_unwind_nolexenv_norz(duk_hthread *thr, duk_activation *act); + +#if defined(DUK_USE_FINALIZER_TORTURE) +DUK_INTERNAL_DECL void duk_hthread_valstack_torture_realloc(duk_hthread *thr); +#endif + +DUK_INTERNAL_DECL void *duk_hthread_get_valstack_ptr(duk_heap *heap, void *ud); /* indirect allocs */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_INTERNAL_DECL duk_uint_fast32_t duk_hthread_get_act_curr_pc(duk_hthread *thr, duk_activation *act); +#endif +DUK_INTERNAL_DECL duk_uint_fast32_t duk_hthread_get_act_prev_pc(duk_hthread *thr, duk_activation *act); +DUK_INTERNAL_DECL void duk_hthread_sync_currpc(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_hthread_sync_and_null_currpc(duk_hthread *thr); + +#endif /* DUK_HTHREAD_H_INCLUDED */ +/* #include duk_harray.h */ +#line 1 "duk_harray.h" +/* + * Array object representation, used for actual Array instances. + * + * All objects with the exotic array behavior (which must coincide with having + * internal class array) MUST be duk_harrays. No other object can be a + * duk_harray. However, duk_harrays may not always have an array part. + */ + +#if !defined(DUK_HARRAY_H_INCLUDED) +#define DUK_HARRAY_H_INCLUDED + +#define DUK_ASSERT_HARRAY_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT(DUK_HOBJECT_IS_ARRAY((duk_hobject *) (h))); \ + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY((duk_hobject *) (h))); \ + } while (0) + +#define DUK_HARRAY_LENGTH_WRITABLE(h) (!(h)->length_nonwritable) +#define DUK_HARRAY_LENGTH_NONWRITABLE(h) ((h)->length_nonwritable) +#define DUK_HARRAY_SET_LENGTH_WRITABLE(h) do { (h)->length_nonwritable = 0; } while (0) +#define DUK_HARRAY_SET_LENGTH_NONWRITABLE(h) do { (h)->length_nonwritable = 1; } while (0) + +struct duk_harray { + /* Shared object part. */ + duk_hobject obj; + + /* Array .length. + * + * At present Array .length may be smaller, equal, or even larger + * than the allocated underlying array part. Fast path code must + * always take this into account carefully. + */ + duk_uint32_t length; + + /* Array .length property attributes. The property is always + * non-enumerable and non-configurable. It's initially writable + * but per Object.defineProperty() rules it can be made non-writable + * even if it is non-configurable. Thus we need to track the + * writability explicitly. + * + * XXX: this field to be eliminated and moved into duk_hobject + * flags field to save space. + */ + duk_bool_t length_nonwritable; +}; + +#endif /* DUK_HARRAY_H_INCLUDED */ +/* #include duk_henv.h */ +#line 1 "duk_henv.h" +/* + * Environment object representation. + */ + +#if !defined(DUK_HENV_H_INCLUDED) +#define DUK_HENV_H_INCLUDED + +#define DUK_ASSERT_HDECENV_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT(DUK_HOBJECT_IS_DECENV((duk_hobject *) (h))); \ + DUK_ASSERT((h)->thread == NULL || (h)->varmap != NULL); \ + } while (0) + +#define DUK_ASSERT_HOBJENV_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT(DUK_HOBJECT_IS_OBJENV((duk_hobject *) (h))); \ + DUK_ASSERT((h)->target != NULL); \ + DUK_ASSERT((h)->has_this == 0 || (h)->has_this == 1); \ + } while (0) + +struct duk_hdecenv { + /* Shared object part. */ + duk_hobject obj; + + /* These control variables provide enough information to access live + * variables for a closure that is still open. If thread == NULL, + * the record is closed and the identifiers are in the property table. + */ + duk_hthread *thread; + duk_hobject *varmap; + duk_size_t regbase_byteoff; +}; + +struct duk_hobjenv { + /* Shared object part. */ + duk_hobject obj; + + /* Target object and 'this' binding for object binding. */ + duk_hobject *target; + + /* The 'target' object is used as a this binding in only some object + * environments. For example, the global environment does not provide + * a this binding, but a with statement does. + */ + duk_bool_t has_this; +}; + +#endif /* DUK_HENV_H_INCLUDED */ +/* #include duk_hbuffer.h */ +#line 1 "duk_hbuffer.h" +/* + * Heap buffer representation. + * + * Heap allocated user data buffer which is either: + * + * 1. A fixed size buffer (data follows header statically) + * 2. A dynamic size buffer (data pointer follows header) + * + * The data pointer for a variable size buffer of zero size may be NULL. + */ + +#if !defined(DUK_HBUFFER_H_INCLUDED) +#define DUK_HBUFFER_H_INCLUDED + +/* + * Flags + * + * Fixed buffer: 0 + * Dynamic buffer: DUK_HBUFFER_FLAG_DYNAMIC + * External buffer: DUK_HBUFFER_FLAG_DYNAMIC | DUK_HBUFFER_FLAG_EXTERNAL + */ + +#define DUK_HBUFFER_FLAG_DYNAMIC DUK_HEAPHDR_USER_FLAG(0) /* buffer is behind a pointer, dynamic or external */ +#define DUK_HBUFFER_FLAG_EXTERNAL DUK_HEAPHDR_USER_FLAG(1) /* buffer pointer is to an externally allocated buffer */ + +#define DUK_HBUFFER_HAS_DYNAMIC(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HBUFFER_FLAG_DYNAMIC) +#define DUK_HBUFFER_HAS_EXTERNAL(x) DUK_HEAPHDR_CHECK_FLAG_BITS(&(x)->hdr, DUK_HBUFFER_FLAG_EXTERNAL) + +#define DUK_HBUFFER_SET_DYNAMIC(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HBUFFER_FLAG_DYNAMIC) +#define DUK_HBUFFER_SET_EXTERNAL(x) DUK_HEAPHDR_SET_FLAG_BITS(&(x)->hdr, DUK_HBUFFER_FLAG_EXTERNAL) + +#define DUK_HBUFFER_CLEAR_DYNAMIC(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HBUFFER_FLAG_DYNAMIC) +#define DUK_HBUFFER_CLEAR_EXTERNAL(x) DUK_HEAPHDR_CLEAR_FLAG_BITS(&(x)->hdr, DUK_HBUFFER_FLAG_EXTERNAL) + +/* + * Misc defines + */ + +/* Impose a maximum buffer length for now. Restricted artificially to + * ensure resize computations or adding a heap header length won't + * overflow size_t and that a signed duk_int_t can hold a buffer + * length. The limit should be synchronized with DUK_HSTRING_MAX_BYTELEN. + */ + +#if defined(DUK_USE_BUFLEN16) +#define DUK_HBUFFER_MAX_BYTELEN (0x0000ffffUL) +#else +/* Intentionally not 0x7fffffffUL; at least JSON code expects that + * 2*len + 2 fits in 32 bits. + */ +#define DUK_HBUFFER_MAX_BYTELEN (0x7ffffffeUL) +#endif + +/* + * Field access + */ + +#if defined(DUK_USE_BUFLEN16) +/* size stored in duk_heaphdr unused flag bits */ +#define DUK_HBUFFER_GET_SIZE(x) ((x)->hdr.h_flags >> 16) +#define DUK_HBUFFER_SET_SIZE(x,v) do { \ + duk_size_t duk__v; \ + duk__v = (v); \ + DUK_ASSERT(duk__v <= 0xffffUL); \ + (x)->hdr.h_flags = ((x)->hdr.h_flags & 0x0000ffffUL) | (((duk_uint32_t) duk__v) << 16); \ + } while (0) +#define DUK_HBUFFER_ADD_SIZE(x,dv) do { \ + (x)->hdr.h_flags += ((dv) << 16); \ + } while (0) +#define DUK_HBUFFER_SUB_SIZE(x,dv) do { \ + (x)->hdr.h_flags -= ((dv) << 16); \ + } while (0) +#else +#define DUK_HBUFFER_GET_SIZE(x) (((duk_hbuffer *) (x))->size) +#define DUK_HBUFFER_SET_SIZE(x,v) do { \ + ((duk_hbuffer *) (x))->size = (v); \ + } while (0) +#define DUK_HBUFFER_ADD_SIZE(x,dv) do { \ + (x)->size += (dv); \ + } while (0) +#define DUK_HBUFFER_SUB_SIZE(x,dv) do { \ + (x)->size -= (dv); \ + } while (0) +#endif + +#define DUK_HBUFFER_FIXED_GET_SIZE(x) DUK_HBUFFER_GET_SIZE((duk_hbuffer *) (x)) +#define DUK_HBUFFER_FIXED_SET_SIZE(x,v) DUK_HBUFFER_SET_SIZE((duk_hbuffer *) (x)) + +#define DUK_HBUFFER_DYNAMIC_GET_SIZE(x) DUK_HBUFFER_GET_SIZE((duk_hbuffer *) (x)) +#define DUK_HBUFFER_DYNAMIC_SET_SIZE(x,v) DUK_HBUFFER_SET_SIZE((duk_hbuffer *) (x), (v)) +#define DUK_HBUFFER_DYNAMIC_ADD_SIZE(x,dv) DUK_HBUFFER_ADD_SIZE((duk_hbuffer *) (x), (dv)) +#define DUK_HBUFFER_DYNAMIC_SUB_SIZE(x,dv) DUK_HBUFFER_SUB_SIZE((duk_hbuffer *) (x), (dv)) + +#define DUK_HBUFFER_EXTERNAL_GET_SIZE(x) DUK_HBUFFER_GET_SIZE((duk_hbuffer *) (x)) +#define DUK_HBUFFER_EXTERNAL_SET_SIZE(x,v) DUK_HBUFFER_SET_SIZE((duk_hbuffer *) (x), (v)) + +#define DUK_HBUFFER_FIXED_GET_DATA_PTR(heap,x) ((duk_uint8_t *) (((duk_hbuffer_fixed *) (void *) (x)) + 1)) + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(heap,x) \ + ((void *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, ((duk_heaphdr *) (x))->h_extra16)) +#define DUK_HBUFFER_DYNAMIC_SET_DATA_PTR(heap,x,v) do { \ + ((duk_heaphdr *) (x))->h_extra16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HBUFFER_DYNAMIC_SET_DATA_PTR_NULL(heap,x) do { \ + ((duk_heaphdr *) (x))->h_extra16 = 0; /* assume 0 <=> NULL */ \ + } while (0) +#else +#define DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(heap,x) ((x)->curr_alloc) +#define DUK_HBUFFER_DYNAMIC_SET_DATA_PTR(heap,x,v) do { \ + (x)->curr_alloc = (void *) (v); \ + } while (0) +#define DUK_HBUFFER_DYNAMIC_SET_DATA_PTR_NULL(heap,x) do { \ + (x)->curr_alloc = (void *) NULL; \ + } while (0) +#endif + +/* No pointer compression because pointer is potentially outside of + * Duktape heap. + */ +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HBUFFER_EXTERNAL_GET_DATA_PTR(heap,x) \ + ((void *) (x)->curr_alloc) +#define DUK_HBUFFER_EXTERNAL_SET_DATA_PTR(heap,x,v) do { \ + (x)->curr_alloc = (void *) (v); \ + } while (0) +#define DUK_HBUFFER_EXTERNAL_SET_DATA_PTR_NULL(heap,x) do { \ + (x)->curr_alloc = (void *) NULL; \ + } while (0) +#else +#define DUK_HBUFFER_EXTERNAL_GET_DATA_PTR(heap,x) \ + ((void *) (x)->curr_alloc) +#define DUK_HBUFFER_EXTERNAL_SET_DATA_PTR(heap,x,v) do { \ + (x)->curr_alloc = (void *) (v); \ + } while (0) +#define DUK_HBUFFER_EXTERNAL_SET_DATA_PTR_NULL(heap,x) do { \ + (x)->curr_alloc = (void *) NULL; \ + } while (0) +#endif + +/* Get a pointer to the current buffer contents (matching current allocation + * size). May be NULL for zero size dynamic/external buffer. + */ +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HBUFFER_GET_DATA_PTR(heap,x) ( \ + DUK_HBUFFER_HAS_DYNAMIC((x)) ? \ + ( \ + DUK_HBUFFER_HAS_EXTERNAL((x)) ? \ + DUK_HBUFFER_EXTERNAL_GET_DATA_PTR((heap), (duk_hbuffer_external *) (x)) : \ + DUK_HBUFFER_DYNAMIC_GET_DATA_PTR((heap), (duk_hbuffer_dynamic *) (x)) \ + ) : \ + DUK_HBUFFER_FIXED_GET_DATA_PTR((heap), (duk_hbuffer_fixed *) (void *) (x)) \ + ) +#else +/* Without heap pointer compression duk_hbuffer_dynamic and duk_hbuffer_external + * have the same layout so checking for fixed vs. dynamic (or external) is enough. + */ +#define DUK_HBUFFER_GET_DATA_PTR(heap,x) ( \ + DUK_HBUFFER_HAS_DYNAMIC((x)) ? \ + DUK_HBUFFER_DYNAMIC_GET_DATA_PTR((heap), (duk_hbuffer_dynamic *) (x)) : \ + DUK_HBUFFER_FIXED_GET_DATA_PTR((heap), (duk_hbuffer_fixed *) (void *) (x)) \ + ) +#endif + +/* + * Structs + */ + +/* Shared prefix for all buffer types. */ +struct duk_hbuffer { + duk_heaphdr hdr; + + /* It's not strictly necessary to track the current size, but + * it is useful for writing robust native code. + */ + + /* Current size. */ +#if defined(DUK_USE_BUFLEN16) + /* Stored in duk_heaphdr unused flags. */ +#else + duk_size_t size; +#endif + + /* + * Data following the header depends on the DUK_HBUFFER_FLAG_DYNAMIC + * flag. + * + * If the flag is clear (the buffer is a fixed size one), the buffer + * data follows the header directly, consisting of 'size' bytes. + * + * If the flag is set, the actual buffer is allocated separately, and + * a few control fields follow the header. Specifically: + * + * - a "void *" pointing to the current allocation + * - a duk_size_t indicating the full allocated size (always >= 'size') + * + * If DUK_HBUFFER_FLAG_EXTERNAL is set, the buffer has been allocated + * by user code, so that Duktape won't be able to resize it and won't + * free it. This allows buffers to point to e.g. an externally + * allocated structure such as a frame buffer. + * + * Unlike strings, no terminator byte (NUL) is guaranteed after the + * data. This would be convenient, but would pad aligned user buffers + * unnecessarily upwards in size. For instance, if user code requested + * a 64-byte dynamic buffer, 65 bytes would actually be allocated which + * would then potentially round upwards to perhaps 68 or 72 bytes. + */ +}; + +/* Fixed buffer; data follows struct, with proper alignment guaranteed by + * struct size. + */ +#if (DUK_USE_ALIGN_BY == 8) && defined(DUK_USE_PACK_MSVC_PRAGMA) +#pragma pack(push, 8) +#endif +struct duk_hbuffer_fixed { + /* A union is used here as a portable struct size / alignment trick: + * by adding a 32-bit or a 64-bit (unused) union member, the size of + * the struct is effectively forced to be a multiple of 4 or 8 bytes + * (respectively) without increasing the size of the struct unless + * necessary. + */ + union { + struct { + duk_heaphdr hdr; +#if defined(DUK_USE_BUFLEN16) + /* Stored in duk_heaphdr unused flags. */ +#else + duk_size_t size; +#endif + } s; +#if (DUK_USE_ALIGN_BY == 4) + duk_uint32_t dummy_for_align4; +#elif (DUK_USE_ALIGN_BY == 8) + duk_double_t dummy_for_align8_1; +#if defined(DUK_USE_64BIT_OPS) + duk_uint64_t dummy_for_align8_2; +#endif +#elif (DUK_USE_ALIGN_BY == 1) + /* no extra padding */ +#else +#error invalid DUK_USE_ALIGN_BY +#endif + } u; + + /* + * Data follows the struct header. The struct size is padded by the + * compiler based on the struct members. This guarantees that the + * buffer data will be aligned-by-4 but not necessarily aligned-by-8. + * + * On platforms where alignment does not matter, the struct padding + * could be removed (if there is any). On platforms where alignment + * by 8 is required, the struct size must be forced to be a multiple + * of 8 by some means. Without it, some user code may break, and also + * Duktape itself breaks (e.g. the compiler stores duk_tvals in a + * dynamic buffer). + */ +} +#if (DUK_USE_ALIGN_BY == 8) && defined(DUK_USE_PACK_GCC_ATTR) +__attribute__ ((aligned (8))) +#elif (DUK_USE_ALIGN_BY == 8) && defined(DUK_USE_PACK_CLANG_ATTR) +__attribute__ ((aligned (8))) +#endif +; +#if (DUK_USE_ALIGN_BY == 8) && defined(DUK_USE_PACK_MSVC_PRAGMA) +#pragma pack(pop) +#endif + +/* Dynamic buffer with 'curr_alloc' pointing to a dynamic area allocated using + * heap allocation primitives. Also used for external buffers when low memory + * options are not used. + */ +struct duk_hbuffer_dynamic { + duk_heaphdr hdr; + +#if defined(DUK_USE_BUFLEN16) + /* Stored in duk_heaphdr unused flags. */ +#else + duk_size_t size; +#endif + +#if defined(DUK_USE_HEAPPTR16) + /* Stored in duk_heaphdr h_extra16. */ +#else + void *curr_alloc; /* may be NULL if alloc_size == 0 */ +#endif + + /* + * Allocation size for 'curr_alloc' is alloc_size. There is no + * automatic NUL terminator for buffers (see above for rationale). + * + * 'curr_alloc' is explicitly allocated with heap allocation + * primitives and will thus always have alignment suitable for + * e.g. duk_tval and an IEEE double. + */ +}; + +/* External buffer with 'curr_alloc' managed by user code and pointing to an + * arbitrary address. When heap pointer compression is not used, this struct + * has the same layout as duk_hbuffer_dynamic. + */ +struct duk_hbuffer_external { + duk_heaphdr hdr; + +#if defined(DUK_USE_BUFLEN16) + /* Stored in duk_heaphdr unused flags. */ +#else + duk_size_t size; +#endif + + /* Cannot be compressed as a heap pointer because may point to + * an arbitrary address. + */ + void *curr_alloc; /* may be NULL if alloc_size == 0 */ +}; + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL duk_hbuffer *duk_hbuffer_alloc(duk_heap *heap, duk_size_t size, duk_small_uint_t flags, void **out_bufdata); +DUK_INTERNAL_DECL void *duk_hbuffer_get_dynalloc_ptr(duk_heap *heap, void *ud); /* indirect allocs */ + +/* dynamic buffer ops */ +DUK_INTERNAL_DECL void duk_hbuffer_resize(duk_hthread *thr, duk_hbuffer_dynamic *buf, duk_size_t new_size); +DUK_INTERNAL_DECL void duk_hbuffer_reset(duk_hthread *thr, duk_hbuffer_dynamic *buf); + +#endif /* DUK_HBUFFER_H_INCLUDED */ +/* #include duk_hproxy.h */ +#line 1 "duk_hproxy.h" +/* + * Proxy object representation. + */ + +#if !defined(DUK_HPROXY_H_INCLUDED) +#define DUK_HPROXY_H_INCLUDED + +#define DUK_ASSERT_HPROXY_VALID(h) do { \ + DUK_ASSERT((h) != NULL); \ + DUK_ASSERT((h)->target != NULL); \ + DUK_ASSERT((h)->handler != NULL); \ + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ((duk_hobject *) (h))); \ + } while (0) + +struct duk_hproxy { + /* Shared object part. */ + duk_hobject obj; + + /* Proxy target object. */ + duk_hobject *target; + + /* Proxy handlers (traps). */ + duk_hobject *handler; +}; + +#endif /* DUK_HPROXY_H_INCLUDED */ +/* #include duk_heap.h */ +#line 1 "duk_heap.h" +/* + * Heap structure. + * + * Heap contains allocated heap objects, interned strings, and built-in + * strings for one or more threads. + */ + +#if !defined(DUK_HEAP_H_INCLUDED) +#define DUK_HEAP_H_INCLUDED + +/* alloc function typedefs in duktape.h */ + +/* + * Heap flags + */ + +#define DUK_HEAP_FLAG_MARKANDSWEEP_RECLIMIT_REACHED (1U << 0) /* mark-and-sweep marking reached a recursion limit and must use multi-pass marking */ +#define DUK_HEAP_FLAG_INTERRUPT_RUNNING (1U << 1) /* executor interrupt running (used to avoid nested interrupts) */ +#define DUK_HEAP_FLAG_FINALIZER_NORESCUE (1U << 2) /* heap destruction ongoing, finalizer rescue no longer possible */ +#define DUK_HEAP_FLAG_DEBUGGER_PAUSED (1U << 3) /* debugger is paused: talk with debug client until step/resume */ + +#define DUK__HEAP_HAS_FLAGS(heap,bits) ((heap)->flags & (bits)) +#define DUK__HEAP_SET_FLAGS(heap,bits) do { \ + (heap)->flags |= (bits); \ + } while (0) +#define DUK__HEAP_CLEAR_FLAGS(heap,bits) do { \ + (heap)->flags &= ~(bits); \ + } while (0) + +#define DUK_HEAP_HAS_MARKANDSWEEP_RECLIMIT_REACHED(heap) DUK__HEAP_HAS_FLAGS((heap), DUK_HEAP_FLAG_MARKANDSWEEP_RECLIMIT_REACHED) +#define DUK_HEAP_HAS_INTERRUPT_RUNNING(heap) DUK__HEAP_HAS_FLAGS((heap), DUK_HEAP_FLAG_INTERRUPT_RUNNING) +#define DUK_HEAP_HAS_FINALIZER_NORESCUE(heap) DUK__HEAP_HAS_FLAGS((heap), DUK_HEAP_FLAG_FINALIZER_NORESCUE) +#define DUK_HEAP_HAS_DEBUGGER_PAUSED(heap) DUK__HEAP_HAS_FLAGS((heap), DUK_HEAP_FLAG_DEBUGGER_PAUSED) + +#define DUK_HEAP_SET_MARKANDSWEEP_RECLIMIT_REACHED(heap) DUK__HEAP_SET_FLAGS((heap), DUK_HEAP_FLAG_MARKANDSWEEP_RECLIMIT_REACHED) +#define DUK_HEAP_SET_INTERRUPT_RUNNING(heap) DUK__HEAP_SET_FLAGS((heap), DUK_HEAP_FLAG_INTERRUPT_RUNNING) +#define DUK_HEAP_SET_FINALIZER_NORESCUE(heap) DUK__HEAP_SET_FLAGS((heap), DUK_HEAP_FLAG_FINALIZER_NORESCUE) +#define DUK_HEAP_SET_DEBUGGER_PAUSED(heap) DUK__HEAP_SET_FLAGS((heap), DUK_HEAP_FLAG_DEBUGGER_PAUSED) + +#define DUK_HEAP_CLEAR_MARKANDSWEEP_RECLIMIT_REACHED(heap) DUK__HEAP_CLEAR_FLAGS((heap), DUK_HEAP_FLAG_MARKANDSWEEP_RECLIMIT_REACHED) +#define DUK_HEAP_CLEAR_INTERRUPT_RUNNING(heap) DUK__HEAP_CLEAR_FLAGS((heap), DUK_HEAP_FLAG_INTERRUPT_RUNNING) +#define DUK_HEAP_CLEAR_FINALIZER_NORESCUE(heap) DUK__HEAP_CLEAR_FLAGS((heap), DUK_HEAP_FLAG_FINALIZER_NORESCUE) +#define DUK_HEAP_CLEAR_DEBUGGER_PAUSED(heap) DUK__HEAP_CLEAR_FLAGS((heap), DUK_HEAP_FLAG_DEBUGGER_PAUSED) + +/* + * Longjmp types, also double as identifying continuation type for a rethrow (in 'finally') + */ + +#define DUK_LJ_TYPE_UNKNOWN 0 /* unused */ +#define DUK_LJ_TYPE_THROW 1 /* value1 -> error object */ +#define DUK_LJ_TYPE_YIELD 2 /* value1 -> yield value, iserror -> error / normal */ +#define DUK_LJ_TYPE_RESUME 3 /* value1 -> resume value, value2 -> resumee thread, iserror -> error/normal */ +#define DUK_LJ_TYPE_BREAK 4 /* value1 -> label number, pseudo-type to indicate a break continuation (for ENDFIN) */ +#define DUK_LJ_TYPE_CONTINUE 5 /* value1 -> label number, pseudo-type to indicate a continue continuation (for ENDFIN) */ +#define DUK_LJ_TYPE_RETURN 6 /* value1 -> return value, pseudo-type to indicate a return continuation (for ENDFIN) */ +#define DUK_LJ_TYPE_NORMAL 7 /* no value, pseudo-type to indicate a normal continuation (for ENDFIN) */ + +/* + * Mark-and-sweep flags + * + * These are separate from heap level flags now but could be merged. + * The heap structure only contains a 'base mark-and-sweep flags' + * field and the GC caller can impose further flags. + */ + +/* Emergency mark-and-sweep: try extra hard, even at the cost of + * performance. + */ +#define DUK_MS_FLAG_EMERGENCY (1U << 0) + +/* Voluntary mark-and-sweep: triggered periodically. */ +#define DUK_MS_FLAG_VOLUNTARY (1U << 1) + +/* Postpone rescue decisions for reachable objects with FINALIZED set. + * Used during finalize_list processing to avoid incorrect rescue + * decisions due to finalize_list being a reachability root. + */ +#define DUK_MS_FLAG_POSTPONE_RESCUE (1U << 2) + +/* Don't compact objects; needed during object property table resize + * to prevent a recursive resize. It would suffice to protect only the + * current object being resized, but this is not yet implemented. + */ +#define DUK_MS_FLAG_NO_OBJECT_COMPACTION (1U << 3) + +/* + * Thread switching + * + * To switch heap->curr_thread, use the macro below so that interrupt counters + * get updated correctly. The macro allows a NULL target thread because that + * happens e.g. in call handling. + */ + +#if defined(DUK_USE_INTERRUPT_COUNTER) +#define DUK_HEAP_SWITCH_THREAD(heap,newthr) duk_heap_switch_thread((heap), (newthr)) +#else +#define DUK_HEAP_SWITCH_THREAD(heap,newthr) do { \ + (heap)->curr_thread = (newthr); \ + } while (0) +#endif + +/* + * Stats + */ + +#if defined(DUK_USE_DEBUG) +#define DUK_STATS_INC(heap,fieldname) do { \ + (heap)->fieldname += 1; \ + } while (0) +#else +#define DUK_STATS_INC(heap,fieldname) do {} while (0) +#endif + +/* + * Other heap related defines + */ + +/* Mark-and-sweep interval is relative to combined count of objects and + * strings kept in the heap during the latest mark-and-sweep pass. + * Fixed point .8 multiplier and .0 adder. Trigger count (interval) is + * decreased by each (re)allocation attempt (regardless of size), and each + * refzero processed object. + * + * 'SKIP' indicates how many (re)allocations to wait until a retry if + * GC is skipped because there is no thread do it with yet (happens + * only during init phases). + */ +#if defined(DUK_USE_REFERENCE_COUNTING) +#define DUK_HEAP_MARK_AND_SWEEP_TRIGGER_MULT 12800L /* 50x heap size */ +#define DUK_HEAP_MARK_AND_SWEEP_TRIGGER_ADD 1024L +#define DUK_HEAP_MARK_AND_SWEEP_TRIGGER_SKIP 256L +#else +#define DUK_HEAP_MARK_AND_SWEEP_TRIGGER_MULT 256L /* 1x heap size */ +#define DUK_HEAP_MARK_AND_SWEEP_TRIGGER_ADD 1024L +#define DUK_HEAP_MARK_AND_SWEEP_TRIGGER_SKIP 256L +#endif + +/* GC torture. */ +#if defined(DUK_USE_GC_TORTURE) +#define DUK_GC_TORTURE(heap) do { duk_heap_mark_and_sweep((heap), 0); } while (0) +#else +#define DUK_GC_TORTURE(heap) do { } while (0) +#endif + +/* Stringcache is used for speeding up char-offset-to-byte-offset + * translations for non-ASCII strings. + */ +#define DUK_HEAP_STRCACHE_SIZE 4 +#define DUK_HEAP_STRINGCACHE_NOCACHE_LIMIT 16 /* strings up to the this length are not cached */ + +/* Some list management macros. */ +#define DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(heap,hdr) duk_heap_insert_into_heap_allocated((heap), (hdr)) +#if defined(DUK_USE_REFERENCE_COUNTING) +#define DUK_HEAP_REMOVE_FROM_HEAP_ALLOCATED(heap,hdr) duk_heap_remove_from_heap_allocated((heap), (hdr)) +#endif +#if defined(DUK_USE_FINALIZER_SUPPORT) +#define DUK_HEAP_INSERT_INTO_FINALIZE_LIST(heap,hdr) duk_heap_insert_into_finalize_list((heap), (hdr)) +#define DUK_HEAP_REMOVE_FROM_FINALIZE_LIST(heap,hdr) duk_heap_remove_from_finalize_list((heap), (hdr)) +#endif + +/* + * Built-in strings + */ + +/* heap string indices are autogenerated in duk_strings.h */ +#if defined(DUK_USE_ROM_STRINGS) +#define DUK_HEAP_GET_STRING(heap,idx) \ + ((duk_hstring *) DUK_LOSE_CONST(duk_rom_strings_stridx[(idx)])) +#else /* DUK_USE_ROM_STRINGS */ +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HEAP_GET_STRING(heap,idx) \ + ((duk_hstring *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (heap)->strs16[(idx)])) +#else +#define DUK_HEAP_GET_STRING(heap,idx) \ + ((heap)->strs[(idx)]) +#endif +#endif /* DUK_USE_ROM_STRINGS */ + +/* + * Raw memory calls: relative to heap, but no GC interaction + */ + +#define DUK_ALLOC_RAW(heap,size) \ + ((heap)->alloc_func((heap)->heap_udata, (size))) + +#define DUK_REALLOC_RAW(heap,ptr,newsize) \ + ((heap)->realloc_func((heap)->heap_udata, (void *) (ptr), (newsize))) + +#define DUK_FREE_RAW(heap,ptr) \ + ((heap)->free_func((heap)->heap_udata, (void *) (ptr))) + +/* + * Memory calls: relative to heap, GC interaction, but no error throwing. + * + * XXX: Currently a mark-and-sweep triggered by memory allocation will run + * using the heap->heap_thread. This thread is also used for running + * mark-and-sweep finalization; this is not ideal because it breaks the + * isolation between multiple global environments. + * + * Notes: + * + * - DUK_FREE() is required to ignore NULL and any other possible return + * value of a zero-sized alloc/realloc (same as ANSI C free()). + * + * - There is no DUK_REALLOC_ZEROED because we don't assume to know the + * old size. Caller must zero the reallocated memory. + * + * - DUK_REALLOC_INDIRECT() must be used when a mark-and-sweep triggered + * by an allocation failure might invalidate the original 'ptr', thus + * causing a realloc retry to use an invalid pointer. Example: we're + * reallocating the value stack and a finalizer resizes the same value + * stack during mark-and-sweep. The indirect variant requests for the + * current location of the pointer being reallocated using a callback + * right before every realloc attempt; this circuitous approach is used + * to avoid strict aliasing issues in a more straightforward indirect + * pointer (void **) approach. Note: the pointer in the storage + * location is read but is NOT updated; the caller must do that. + */ + +/* callback for indirect reallocs, request for current pointer */ +typedef void *(*duk_mem_getptr)(duk_heap *heap, void *ud); + +#define DUK_ALLOC(heap,size) duk_heap_mem_alloc((heap), (size)) +#define DUK_ALLOC_ZEROED(heap,size) duk_heap_mem_alloc_zeroed((heap), (size)) +#define DUK_REALLOC(heap,ptr,newsize) duk_heap_mem_realloc((heap), (ptr), (newsize)) +#define DUK_REALLOC_INDIRECT(heap,cb,ud,newsize) duk_heap_mem_realloc_indirect((heap), (cb), (ud), (newsize)) +#define DUK_FREE(heap,ptr) duk_heap_mem_free((heap), (ptr)) + +/* + * Checked allocation, relative to a thread + * + * DUK_FREE_CHECKED() doesn't actually throw, but accepts a 'thr' argument + * for convenience. + */ + +#define DUK_ALLOC_CHECKED(thr,size) duk_heap_mem_alloc_checked((thr), (size)) +#define DUK_ALLOC_CHECKED_ZEROED(thr,size) duk_heap_mem_alloc_checked_zeroed((thr), (size)) +#define DUK_FREE_CHECKED(thr,ptr) duk_heap_mem_free((thr)->heap, (ptr)) + +/* + * Memory constants + */ + +#define DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT 10 /* Retry allocation after mark-and-sweep for this + * many times. A single mark-and-sweep round is + * not guaranteed to free all unreferenced memory + * because of finalization (in fact, ANY number of + * rounds is strictly not enough). + */ + +#define DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT 3 /* Starting from this round, use emergency mode + * for mark-and-sweep. + */ + +/* + * Debugger support + */ + +/* Maximum number of breakpoints. Only breakpoints that are set are + * consulted so increasing this has no performance impact. + */ +#define DUK_HEAP_MAX_BREAKPOINTS 16 + +/* Opcode interval for a Date-based status/peek rate limit check. Only + * relevant when debugger is attached. Requesting a timestamp may be a + * slow operation on some platforms so this shouldn't be too low. On the + * other hand a high value makes Duktape react to a pause request slowly. + */ +#define DUK_HEAP_DBG_RATELIMIT_OPCODES 4000 + +/* Milliseconds between status notify and transport peeks. */ +#define DUK_HEAP_DBG_RATELIMIT_MILLISECS 200 + +/* Debugger pause flags. */ +#define DUK_PAUSE_FLAG_ONE_OPCODE (1U << 0) /* pause when a single opcode has been executed */ +#define DUK_PAUSE_FLAG_ONE_OPCODE_ACTIVE (1U << 1) /* one opcode pause actually active; artifact of current implementation */ +#define DUK_PAUSE_FLAG_LINE_CHANGE (1U << 2) /* pause when current line number changes */ +#define DUK_PAUSE_FLAG_FUNC_ENTRY (1U << 3) /* pause when entering a function */ +#define DUK_PAUSE_FLAG_FUNC_EXIT (1U << 4) /* pause when exiting current function */ +#define DUK_PAUSE_FLAG_CAUGHT_ERROR (1U << 5) /* pause when about to throw an error that is caught */ +#define DUK_PAUSE_FLAG_UNCAUGHT_ERROR (1U << 6) /* pause when about to throw an error that won't be caught */ + +struct duk_breakpoint { + duk_hstring *filename; + duk_uint32_t line; +}; + +/* + * String cache should ideally be at duk_hthread level, but that would + * cause string finalization to slow down relative to the number of + * threads; string finalization must check the string cache for "weak" + * references to the string being finalized to avoid dead pointers. + * + * Thus, string caches are now at the heap level now. + */ + +struct duk_strcache_entry { + duk_hstring *h; + duk_uint32_t bidx; + duk_uint32_t cidx; +}; + +/* + * Longjmp state, contains the information needed to perform a longjmp. + * Longjmp related values are written to value1, value2, and iserror. + */ + +struct duk_ljstate { + duk_jmpbuf *jmpbuf_ptr; /* current setjmp() catchpoint */ + duk_small_uint_t type; /* longjmp type */ + duk_bool_t iserror; /* isError flag for yield */ + duk_tval value1; /* 1st related value (type specific) */ + duk_tval value2; /* 2nd related value (type specific) */ +}; + +#define DUK_ASSERT_LJSTATE_UNSET(heap) do { \ + DUK_ASSERT(heap != NULL); \ + DUK_ASSERT(heap->lj.type == DUK_LJ_TYPE_UNKNOWN); \ + DUK_ASSERT(heap->lj.iserror == 0); \ + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&heap->lj.value1)); \ + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&heap->lj.value2)); \ + } while (0) +#define DUK_ASSERT_LJSTATE_SET(heap) do { \ + DUK_ASSERT(heap != NULL); \ + DUK_ASSERT(heap->lj.type != DUK_LJ_TYPE_UNKNOWN); \ + } while (0) + +/* + * Literal intern cache + */ + +struct duk_litcache_entry { + const duk_uint8_t *addr; + duk_hstring *h; +}; + +/* + * Main heap structure + */ + +struct duk_heap { + duk_small_uint_t flags; + + /* Allocator functions. */ + duk_alloc_function alloc_func; + duk_realloc_function realloc_func; + duk_free_function free_func; + + /* Heap udata, used for allocator functions but also for other heap + * level callbacks like fatal function, pointer compression, etc. + */ + void *heap_udata; + + /* Fatal error handling, called e.g. when a longjmp() is needed but + * lj.jmpbuf_ptr is NULL. fatal_func must never return; it's not + * declared as "noreturn" because doing that for typedefs is a bit + * challenging portability-wise. + */ + duk_fatal_function fatal_func; + + /* Main list of allocated heap objects. Objects are either here, + * in finalize_list waiting for processing, or in refzero_list + * temporarily while a DECREF refzero cascade finishes. + */ + duk_heaphdr *heap_allocated; + + /* Temporary work list for freeing a cascade of objects when a DECREF + * (or DECREF_NORZ) encounters a zero refcount. Using a work list + * allows fixed C stack size when refcounts go to zero for a chain of + * objects. Outside of DECREF this is always a NULL because DECREF is + * processed without side effects (only memory free calls). + */ +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_heaphdr *refzero_list; +#endif + +#if defined(DUK_USE_FINALIZER_SUPPORT) + /* Work list for objects to be finalized. */ + duk_heaphdr *finalize_list; +#if defined(DUK_USE_ASSERTIONS) + /* Object whose finalizer is executing right now (no nesting). */ + duk_heaphdr *currently_finalizing; +#endif +#endif + + /* Freelist for duk_activations and duk_catchers. */ +#if defined(DUK_USE_CACHE_ACTIVATION) + duk_activation *activation_free; +#endif +#if defined(DUK_USE_CACHE_CATCHER) + duk_catcher *catcher_free; +#endif + + /* Voluntary mark-and-sweep trigger counter. Intentionally signed + * because we continue decreasing the value when voluntary GC cannot + * run. + */ +#if defined(DUK_USE_VOLUNTARY_GC) + duk_int_t ms_trigger_counter; +#endif + + /* Mark-and-sweep recursion control: too deep recursion causes + * multi-pass processing to avoid growing C stack without bound. + */ + duk_uint_t ms_recursion_depth; + + /* Mark-and-sweep flags automatically active (used for critical sections). */ + duk_small_uint_t ms_base_flags; + + /* Mark-and-sweep running flag. Prevents re-entry, and also causes + * refzero events to be ignored (= objects won't be queued to refzero_list). + */ + duk_uint_t ms_running; + + /* Mark-and-sweep prevent count, stacking. Used to avoid M&S side + * effects (besides finalizers which are controlled separately) such + * as compacting the string table or object property tables. This + * is also bumped when ms_running is set to prevent recursive re-entry. + * Can also be bumped when mark-and-sweep is not running. + */ + duk_uint_t ms_prevent_count; + + /* Finalizer processing prevent count, stacking. Bumped when finalizers + * are processed to prevent recursive finalizer processing (first call site + * processing finalizers handles all finalizers until the list is empty). + * Can also be bumped explicitly to prevent finalizer execution. + */ + duk_uint_t pf_prevent_count; + + /* When processing finalize_list, don't actually run finalizers but + * queue finalizable objects back to heap_allocated as is. This is + * used during heap destruction to deal with finalizers that keep + * on creating more finalizable garbage. + */ + duk_uint_t pf_skip_finalizers; + +#if defined(DUK_USE_ASSERTIONS) + /* Set when we're in a critical path where an error throw would cause + * e.g. sandboxing/protected call violations or state corruption. This + * is just used for asserts. + */ + duk_bool_t error_not_allowed; +#endif + +#if defined(DUK_USE_ASSERTIONS) + /* Set when heap is still being initialized, helps with writing + * some assertions. + */ + duk_bool_t heap_initializing; +#endif + + /* Marker for detecting internal "double faults", errors thrown when + * we're trying to create an error object, see duk_error_throw.c. + */ + duk_bool_t creating_error; + + /* Marker for indicating we're calling a user error augmentation + * (errCreate/errThrow) function. Errors created/thrown during + * such a call are not augmented. + */ +#if defined(DUK_USE_AUGMENT_ERROR_THROW) || defined(DUK_USE_AUGMENT_ERROR_CREATE) + duk_bool_t augmenting_error; +#endif + + /* Longjmp state. */ + duk_ljstate lj; + + /* Heap thread, used internally and for finalization. */ + duk_hthread *heap_thread; + + /* Current running thread. */ + duk_hthread *curr_thread; + + /* Heap level "stash" object (e.g., various reachability roots). */ + duk_hobject *heap_object; + + /* duk_handle_call / duk_handle_safe_call recursion depth limiting */ + duk_int_t call_recursion_depth; + duk_int_t call_recursion_limit; + + /* Mix-in value for computing string hashes; should be reasonably unpredictable. */ + duk_uint32_t hash_seed; + + /* Random number state for duk_util_tinyrandom.c. */ +#if !defined(DUK_USE_GET_RANDOM_DOUBLE) +#if defined(DUK_USE_PREFER_SIZE) || !defined(DUK_USE_64BIT_OPS) + duk_uint32_t rnd_state; /* State for Shamir's three-op algorithm */ +#else + duk_uint64_t rnd_state[2]; /* State for xoroshiro128+ */ +#endif +#endif + + /* Counter for unique local symbol creation. */ + /* XXX: When 64-bit types are available, it would be more efficient to + * use a duk_uint64_t at least for incrementing but maybe also for + * string formatting in the Symbol constructor. + */ + duk_uint32_t sym_counter[2]; + + /* For manual debugging: instruction count based on executor and + * interrupt counter book-keeping. Inspect debug logs to see how + * they match up. + */ +#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) + duk_int_t inst_count_exec; + duk_int_t inst_count_interrupt; +#endif + + /* Debugger state. */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + /* Callbacks and udata; dbg_read_cb != NULL is used to indicate attached state. */ + duk_debug_read_function dbg_read_cb; /* required, NULL implies detached */ + duk_debug_write_function dbg_write_cb; /* required */ + duk_debug_peek_function dbg_peek_cb; + duk_debug_read_flush_function dbg_read_flush_cb; + duk_debug_write_flush_function dbg_write_flush_cb; + duk_debug_request_function dbg_request_cb; + duk_debug_detached_function dbg_detached_cb; + void *dbg_udata; + + /* The following are only relevant when debugger is attached. */ + duk_bool_t dbg_processing; /* currently processing messages or breakpoints: don't enter message processing recursively (e.g. no breakpoints when processing debugger eval) */ + duk_bool_t dbg_state_dirty; /* resend state next time executor is about to run */ + duk_bool_t dbg_force_restart; /* force executor restart to recheck breakpoints; used to handle function returns (see GH-303) */ + duk_bool_t dbg_detaching; /* debugger detaching; used to avoid calling detach handler recursively */ + duk_small_uint_t dbg_pause_flags; /* flags for automatic pause behavior */ + duk_activation *dbg_pause_act; /* activation related to pause behavior (pause on line change, function entry/exit) */ + duk_uint32_t dbg_pause_startline; /* starting line number for line change related pause behavior */ + duk_breakpoint dbg_breakpoints[DUK_HEAP_MAX_BREAKPOINTS]; /* breakpoints: [0,breakpoint_count[ gc reachable */ + duk_small_uint_t dbg_breakpoint_count; + duk_breakpoint *dbg_breakpoints_active[DUK_HEAP_MAX_BREAKPOINTS + 1]; /* currently active breakpoints: NULL term, borrowed pointers */ + /* XXX: make active breakpoints actual copies instead of pointers? */ + + /* These are for rate limiting Status notifications and transport peeking. */ + duk_uint_t dbg_exec_counter; /* cumulative opcode execution count (overflows are OK) */ + duk_uint_t dbg_last_counter; /* value of dbg_exec_counter when we last did a Date-based check */ + duk_double_t dbg_last_time; /* time when status/peek was last done (Date-based rate limit) */ + + /* Used to support single-byte stream lookahead. */ + duk_bool_t dbg_have_next_byte; + duk_uint8_t dbg_next_byte; +#endif /* DUK_USE_DEBUGGER_SUPPORT */ +#if defined(DUK_USE_ASSERTIONS) + duk_bool_t dbg_calling_transport; /* transport call in progress, calling into Duktape forbidden */ +#endif + + /* String intern table (weak refs). */ +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *strtable16; +#else + duk_hstring **strtable; +#endif + duk_uint32_t st_mask; /* mask for lookup, st_size - 1 */ + duk_uint32_t st_size; /* stringtable size */ +#if (DUK_USE_STRTAB_MINSIZE != DUK_USE_STRTAB_MAXSIZE) + duk_uint32_t st_count; /* string count for resize load factor checks */ +#endif + duk_bool_t st_resizing; /* string table is being resized; avoid recursive resize */ + + /* String access cache (codepoint offset -> byte offset) for fast string + * character looping; 'weak' reference which needs special handling in GC. + */ + duk_strcache_entry strcache[DUK_HEAP_STRCACHE_SIZE]; + +#if defined(DUK_USE_LITCACHE_SIZE) + /* Literal intern cache. When enabled, strings interned as literals + * (e.g. duk_push_literal()) will be pinned and cached for the lifetime + * of the heap. + */ + duk_litcache_entry litcache[DUK_USE_LITCACHE_SIZE]; +#endif + + /* Built-in strings. */ +#if defined(DUK_USE_ROM_STRINGS) + /* No field needed when strings are in ROM. */ +#else +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t strs16[DUK_HEAP_NUM_STRINGS]; +#else + duk_hstring *strs[DUK_HEAP_NUM_STRINGS]; +#endif +#endif + + /* Stats. */ +#if defined(DUK_USE_DEBUG) + duk_int_t stats_exec_opcodes; + duk_int_t stats_exec_interrupt; + duk_int_t stats_exec_throw; + duk_int_t stats_call_all; + duk_int_t stats_call_tailcall; + duk_int_t stats_call_ecmatoecma; + duk_int_t stats_safecall_all; + duk_int_t stats_safecall_nothrow; + duk_int_t stats_safecall_throw; + duk_int_t stats_ms_try_count; + duk_int_t stats_ms_skip_count; + duk_int_t stats_ms_emergency_count; + duk_int_t stats_strtab_intern_hit; + duk_int_t stats_strtab_intern_miss; + duk_int_t stats_strtab_resize_check; + duk_int_t stats_strtab_resize_grow; + duk_int_t stats_strtab_resize_shrink; + duk_int_t stats_strtab_litcache_hit; + duk_int_t stats_strtab_litcache_miss; + duk_int_t stats_strtab_litcache_pin; + duk_int_t stats_object_realloc_props; + duk_int_t stats_object_abandon_array; + duk_int_t stats_getownpropdesc_count; + duk_int_t stats_getownpropdesc_hit; + duk_int_t stats_getownpropdesc_miss; + duk_int_t stats_getpropdesc_count; + duk_int_t stats_getpropdesc_hit; + duk_int_t stats_getpropdesc_miss; + duk_int_t stats_getprop_all; + duk_int_t stats_getprop_arrayidx; + duk_int_t stats_getprop_bufobjidx; + duk_int_t stats_getprop_bufferidx; + duk_int_t stats_getprop_bufferlen; + duk_int_t stats_getprop_stringidx; + duk_int_t stats_getprop_stringlen; + duk_int_t stats_getprop_proxy; + duk_int_t stats_getprop_arguments; + duk_int_t stats_putprop_all; + duk_int_t stats_putprop_arrayidx; + duk_int_t stats_putprop_bufobjidx; + duk_int_t stats_putprop_bufferidx; + duk_int_t stats_putprop_proxy; + duk_int_t stats_getvar_all; + duk_int_t stats_putvar_all; +#endif +}; + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL +duk_heap *duk_heap_alloc(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *heap_udata, + duk_fatal_function fatal_func); +DUK_INTERNAL_DECL void duk_heap_free(duk_heap *heap); +DUK_INTERNAL_DECL void duk_free_hobject(duk_heap *heap, duk_hobject *h); +DUK_INTERNAL_DECL void duk_free_hbuffer(duk_heap *heap, duk_hbuffer *h); +DUK_INTERNAL_DECL void duk_free_hstring(duk_heap *heap, duk_hstring *h); +DUK_INTERNAL_DECL void duk_heap_free_heaphdr_raw(duk_heap *heap, duk_heaphdr *hdr); + +DUK_INTERNAL_DECL void duk_heap_insert_into_heap_allocated(duk_heap *heap, duk_heaphdr *hdr); +#if defined(DUK_USE_REFERENCE_COUNTING) +DUK_INTERNAL_DECL void duk_heap_remove_from_heap_allocated(duk_heap *heap, duk_heaphdr *hdr); +#endif +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL_DECL void duk_heap_insert_into_finalize_list(duk_heap *heap, duk_heaphdr *hdr); +DUK_INTERNAL_DECL void duk_heap_remove_from_finalize_list(duk_heap *heap, duk_heaphdr *hdr); +#endif +#if defined(DUK_USE_ASSERTIONS) +DUK_INTERNAL_DECL duk_bool_t duk_heap_in_heap_allocated(duk_heap *heap, duk_heaphdr *ptr); +#endif +#if defined(DUK_USE_INTERRUPT_COUNTER) +DUK_INTERNAL_DECL void duk_heap_switch_thread(duk_heap *heap, duk_hthread *new_thr); +#endif + +DUK_INTERNAL_DECL duk_hstring *duk_heap_strtable_intern(duk_heap *heap, const duk_uint8_t *str, duk_uint32_t blen); +DUK_INTERNAL_DECL duk_hstring *duk_heap_strtable_intern_checked(duk_hthread *thr, const duk_uint8_t *str, duk_uint32_t len); +#if defined(DUK_USE_LITCACHE_SIZE) +DUK_INTERNAL_DECL duk_hstring *duk_heap_strtable_intern_literal_checked(duk_hthread *thr, const duk_uint8_t *str, duk_uint32_t blen); +#endif +DUK_INTERNAL_DECL duk_hstring *duk_heap_strtable_intern_u32(duk_heap *heap, duk_uint32_t val); +DUK_INTERNAL_DECL duk_hstring *duk_heap_strtable_intern_u32_checked(duk_hthread *thr, duk_uint32_t val); +#if defined(DUK_USE_REFERENCE_COUNTING) +DUK_INTERNAL_DECL void duk_heap_strtable_unlink(duk_heap *heap, duk_hstring *h); +#endif +DUK_INTERNAL_DECL void duk_heap_strtable_unlink_prev(duk_heap *heap, duk_hstring *h, duk_hstring *prev); +DUK_INTERNAL_DECL void duk_heap_strtable_force_resize(duk_heap *heap); +DUK_INTERNAL void duk_heap_strtable_free(duk_heap *heap); +#if defined(DUK_USE_DEBUG) +DUK_INTERNAL void duk_heap_strtable_dump(duk_heap *heap); +#endif + +DUK_INTERNAL_DECL void duk_heap_strcache_string_remove(duk_heap *heap, duk_hstring *h); +DUK_INTERNAL_DECL duk_uint_fast32_t duk_heap_strcache_offset_char2byte(duk_hthread *thr, duk_hstring *h, duk_uint_fast32_t char_offset); + +#if defined(DUK_USE_PROVIDE_DEFAULT_ALLOC_FUNCTIONS) +DUK_INTERNAL_DECL void *duk_default_alloc_function(void *udata, duk_size_t size); +DUK_INTERNAL_DECL void *duk_default_realloc_function(void *udata, void *ptr, duk_size_t newsize); +DUK_INTERNAL_DECL void duk_default_free_function(void *udata, void *ptr); +#endif + +DUK_INTERNAL_DECL void *duk_heap_mem_alloc(duk_heap *heap, duk_size_t size); +DUK_INTERNAL_DECL void *duk_heap_mem_alloc_zeroed(duk_heap *heap, duk_size_t size); +DUK_INTERNAL_DECL void *duk_heap_mem_alloc_checked(duk_hthread *thr, duk_size_t size); +DUK_INTERNAL_DECL void *duk_heap_mem_alloc_checked_zeroed(duk_hthread *thr, duk_size_t size); +DUK_INTERNAL_DECL void *duk_heap_mem_realloc(duk_heap *heap, void *ptr, duk_size_t newsize); +DUK_INTERNAL_DECL void *duk_heap_mem_realloc_indirect(duk_heap *heap, duk_mem_getptr cb, void *ud, duk_size_t newsize); +DUK_INTERNAL_DECL void duk_heap_mem_free(duk_heap *heap, void *ptr); + +DUK_INTERNAL_DECL void duk_heap_free_freelists(duk_heap *heap); + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL_DECL void duk_heap_run_finalizer(duk_heap *heap, duk_hobject *obj); +DUK_INTERNAL_DECL void duk_heap_process_finalize_list(duk_heap *heap); +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +DUK_INTERNAL_DECL void duk_heap_mark_and_sweep(duk_heap *heap, duk_small_uint_t flags); + +DUK_INTERNAL_DECL duk_uint32_t duk_heap_hashstring(duk_heap *heap, const duk_uint8_t *str, duk_size_t len); + +#endif /* DUK_HEAP_H_INCLUDED */ +/* #include duk_debugger.h */ +#line 1 "duk_debugger.h" +#if !defined(DUK_DEBUGGER_H_INCLUDED) +#define DUK_DEBUGGER_H_INCLUDED + +/* Debugger protocol version is defined in the public API header. */ + +/* Initial bytes for markers. */ +#define DUK_DBG_IB_EOM 0x00 +#define DUK_DBG_IB_REQUEST 0x01 +#define DUK_DBG_IB_REPLY 0x02 +#define DUK_DBG_IB_ERROR 0x03 +#define DUK_DBG_IB_NOTIFY 0x04 + +/* Other initial bytes. */ +#define DUK_DBG_IB_INT4 0x10 +#define DUK_DBG_IB_STR4 0x11 +#define DUK_DBG_IB_STR2 0x12 +#define DUK_DBG_IB_BUF4 0x13 +#define DUK_DBG_IB_BUF2 0x14 +#define DUK_DBG_IB_UNUSED 0x15 +#define DUK_DBG_IB_UNDEFINED 0x16 +#define DUK_DBG_IB_NULL 0x17 +#define DUK_DBG_IB_TRUE 0x18 +#define DUK_DBG_IB_FALSE 0x19 +#define DUK_DBG_IB_NUMBER 0x1a +#define DUK_DBG_IB_OBJECT 0x1b +#define DUK_DBG_IB_POINTER 0x1c +#define DUK_DBG_IB_LIGHTFUNC 0x1d +#define DUK_DBG_IB_HEAPPTR 0x1e +/* The short string/integer initial bytes starting from 0x60 don't have + * defines now. + */ + +/* Error codes. */ +#define DUK_DBG_ERR_UNKNOWN 0x00 +#define DUK_DBG_ERR_UNSUPPORTED 0x01 +#define DUK_DBG_ERR_TOOMANY 0x02 +#define DUK_DBG_ERR_NOTFOUND 0x03 +#define DUK_DBG_ERR_APPLICATION 0x04 + +/* Commands and notifys initiated by Duktape. */ +#define DUK_DBG_CMD_STATUS 0x01 +#define DUK_DBG_CMD_UNUSED_2 0x02 /* Duktape 1.x: print notify */ +#define DUK_DBG_CMD_UNUSED_3 0x03 /* Duktape 1.x: alert notify */ +#define DUK_DBG_CMD_UNUSED_4 0x04 /* Duktape 1.x: log notify */ +#define DUK_DBG_CMD_THROW 0x05 +#define DUK_DBG_CMD_DETACHING 0x06 +#define DUK_DBG_CMD_APPNOTIFY 0x07 + +/* Commands initiated by debug client. */ +#define DUK_DBG_CMD_BASICINFO 0x10 +#define DUK_DBG_CMD_TRIGGERSTATUS 0x11 +#define DUK_DBG_CMD_PAUSE 0x12 +#define DUK_DBG_CMD_RESUME 0x13 +#define DUK_DBG_CMD_STEPINTO 0x14 +#define DUK_DBG_CMD_STEPOVER 0x15 +#define DUK_DBG_CMD_STEPOUT 0x16 +#define DUK_DBG_CMD_LISTBREAK 0x17 +#define DUK_DBG_CMD_ADDBREAK 0x18 +#define DUK_DBG_CMD_DELBREAK 0x19 +#define DUK_DBG_CMD_GETVAR 0x1a +#define DUK_DBG_CMD_PUTVAR 0x1b +#define DUK_DBG_CMD_GETCALLSTACK 0x1c +#define DUK_DBG_CMD_GETLOCALS 0x1d +#define DUK_DBG_CMD_EVAL 0x1e +#define DUK_DBG_CMD_DETACH 0x1f +#define DUK_DBG_CMD_DUMPHEAP 0x20 +#define DUK_DBG_CMD_GETBYTECODE 0x21 +#define DUK_DBG_CMD_APPREQUEST 0x22 +#define DUK_DBG_CMD_GETHEAPOBJINFO 0x23 +#define DUK_DBG_CMD_GETOBJPROPDESC 0x24 +#define DUK_DBG_CMD_GETOBJPROPDESCRANGE 0x25 + +/* The low 8 bits map directly to duk_hobject.h DUK_PROPDESC_FLAG_xxx. + * The remaining flags are specific to the debugger. + */ +#define DUK_DBG_PROPFLAG_SYMBOL (1U << 8) +#define DUK_DBG_PROPFLAG_HIDDEN (1U << 9) + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_INTERNAL_DECL void duk_debug_do_detach(duk_heap *heap); + +DUK_INTERNAL_DECL duk_bool_t duk_debug_read_peek(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_debug_write_flush(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_debug_skip_bytes(duk_hthread *thr, duk_size_t length); +DUK_INTERNAL_DECL void duk_debug_skip_byte(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_debug_read_bytes(duk_hthread *thr, duk_uint8_t *data, duk_size_t length); +DUK_INTERNAL_DECL duk_uint8_t duk_debug_read_byte(duk_hthread *thr); +DUK_INTERNAL_DECL duk_int32_t duk_debug_read_int(duk_hthread *thr); +DUK_INTERNAL_DECL duk_hstring *duk_debug_read_hstring(duk_hthread *thr); +/* XXX: exposed duk_debug_read_pointer */ +/* XXX: exposed duk_debug_read_buffer */ +/* XXX: exposed duk_debug_read_hbuffer */ +#if 0 +DUK_INTERNAL_DECL duk_heaphdr *duk_debug_read_heapptr(duk_hthread *thr); +#endif +#if defined(DUK_USE_DEBUGGER_INSPECT) +DUK_INTERNAL_DECL duk_heaphdr *duk_debug_read_any_ptr(duk_hthread *thr); +#endif +DUK_INTERNAL_DECL duk_tval *duk_debug_read_tval(duk_hthread *thr); + +DUK_INTERNAL_DECL void duk_debug_write_bytes(duk_hthread *thr, const duk_uint8_t *data, duk_size_t length); +DUK_INTERNAL_DECL void duk_debug_write_byte(duk_hthread *thr, duk_uint8_t x); +DUK_INTERNAL_DECL void duk_debug_write_unused(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_debug_write_undefined(duk_hthread *thr); +#if defined(DUK_USE_DEBUGGER_INSPECT) +DUK_INTERNAL_DECL void duk_debug_write_null(duk_hthread *thr); +#endif +DUK_INTERNAL_DECL void duk_debug_write_boolean(duk_hthread *thr, duk_uint_t val); +DUK_INTERNAL_DECL void duk_debug_write_int(duk_hthread *thr, duk_int32_t x); +DUK_INTERNAL_DECL void duk_debug_write_uint(duk_hthread *thr, duk_uint32_t x); +DUK_INTERNAL_DECL void duk_debug_write_string(duk_hthread *thr, const char *data, duk_size_t length); +DUK_INTERNAL_DECL void duk_debug_write_cstring(duk_hthread *thr, const char *data); +DUK_INTERNAL_DECL void duk_debug_write_hstring(duk_hthread *thr, duk_hstring *h); +DUK_INTERNAL_DECL void duk_debug_write_buffer(duk_hthread *thr, const char *data, duk_size_t length); +DUK_INTERNAL_DECL void duk_debug_write_hbuffer(duk_hthread *thr, duk_hbuffer *h); +DUK_INTERNAL_DECL void duk_debug_write_pointer(duk_hthread *thr, void *ptr); +#if defined(DUK_USE_DEBUGGER_DUMPHEAP) || defined(DUK_USE_DEBUGGER_INSPECT) +DUK_INTERNAL_DECL void duk_debug_write_heapptr(duk_hthread *thr, duk_heaphdr *h); +#endif +DUK_INTERNAL_DECL void duk_debug_write_hobject(duk_hthread *thr, duk_hobject *obj); +DUK_INTERNAL_DECL void duk_debug_write_tval(duk_hthread *thr, duk_tval *tv); +#if 0 /* unused */ +DUK_INTERNAL_DECL void duk_debug_write_request(duk_hthread *thr, duk_small_uint_t command); +#endif +DUK_INTERNAL_DECL void duk_debug_write_reply(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_debug_write_error_eom(duk_hthread *thr, duk_small_uint_t err_code, const char *msg); +DUK_INTERNAL_DECL void duk_debug_write_notify(duk_hthread *thr, duk_small_uint_t command); +DUK_INTERNAL_DECL void duk_debug_write_eom(duk_hthread *thr); + +DUK_INTERNAL_DECL duk_uint_fast32_t duk_debug_curr_line(duk_hthread *thr); +DUK_INTERNAL_DECL void duk_debug_send_status(duk_hthread *thr); +#if defined(DUK_USE_DEBUGGER_THROW_NOTIFY) +DUK_INTERNAL_DECL void duk_debug_send_throw(duk_hthread *thr, duk_bool_t fatal); +#endif + +DUK_INTERNAL_DECL void duk_debug_halt_execution(duk_hthread *thr, duk_bool_t use_prev_pc); +DUK_INTERNAL_DECL duk_bool_t duk_debug_process_messages(duk_hthread *thr, duk_bool_t no_block); + +DUK_INTERNAL_DECL duk_small_int_t duk_debug_add_breakpoint(duk_hthread *thr, duk_hstring *filename, duk_uint32_t line); +DUK_INTERNAL_DECL duk_bool_t duk_debug_remove_breakpoint(duk_hthread *thr, duk_small_uint_t breakpoint_index); + +DUK_INTERNAL_DECL duk_bool_t duk_debug_is_attached(duk_heap *heap); +DUK_INTERNAL_DECL duk_bool_t duk_debug_is_paused(duk_heap *heap); +DUK_INTERNAL_DECL void duk_debug_set_paused(duk_heap *heap); +DUK_INTERNAL_DECL void duk_debug_clear_paused(duk_heap *heap); +DUK_INTERNAL_DECL void duk_debug_clear_pause_state(duk_heap *heap); +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +#endif /* DUK_DEBUGGER_H_INCLUDED */ +/* #include duk_debug.h */ +#line 1 "duk_debug.h" +/* + * Debugging macros, DUK_DPRINT() and its variants in particular. + * + * DUK_DPRINT() allows formatted debug prints, and supports standard + * and Duktape specific formatters. See duk_debug_vsnprintf.c for details. + * + * DUK_D(x), DUK_DD(x), and DUK_DDD(x) are used together with log macros + * for technical reasons. They are concretely used to hide 'x' from the + * compiler when the corresponding log level is disabled. This allows + * clean builds on non-C99 compilers, at the cost of more verbose code. + * Examples: + * + * DUK_D(DUK_DPRINT("foo")); + * DUK_DD(DUK_DDPRINT("foo")); + * DUK_DDD(DUK_DDDPRINT("foo")); + * + * This approach is preferable to the old "double parentheses" hack because + * double parentheses make the C99 solution worse: __FILE__ and __LINE__ can + * no longer be added transparently without going through globals, which + * works poorly with threading. + */ + +#if !defined(DUK_DEBUG_H_INCLUDED) +#define DUK_DEBUG_H_INCLUDED + +#if defined(DUK_USE_DEBUG) + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 0) +#define DUK_D(x) x +#else +#define DUK_D(x) do { } while (0) /* omit */ +#endif + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 1) +#define DUK_DD(x) x +#else +#define DUK_DD(x) do { } while (0) /* omit */ +#endif + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) +#define DUK_DDD(x) x +#else +#define DUK_DDD(x) do { } while (0) /* omit */ +#endif + +/* + * Exposed debug macros: debugging enabled + */ + +#if defined(DUK_USE_VARIADIC_MACROS) + +/* Note: combining __FILE__, __LINE__, and __func__ into fmt would be + * possible compile time, but waste some space with shared function names. + */ +#define DUK__DEBUG_LOG(lev,...) duk_debug_log((duk_int_t) (lev), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, DUK_FUNC_MACRO, __VA_ARGS__); + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 0) +#define DUK_DPRINT(...) DUK__DEBUG_LOG(DUK_LEVEL_DEBUG, __VA_ARGS__) +#else +#define DUK_DPRINT(...) +#endif + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 1) +#define DUK_DDPRINT(...) DUK__DEBUG_LOG(DUK_LEVEL_DDEBUG, __VA_ARGS__) +#else +#define DUK_DDPRINT(...) +#endif + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) +#define DUK_DDDPRINT(...) DUK__DEBUG_LOG(DUK_LEVEL_DDDEBUG, __VA_ARGS__) +#else +#define DUK_DDDPRINT(...) +#endif + +#else /* DUK_USE_VARIADIC_MACROS */ + +#define DUK__DEBUG_STASH(lev) \ + (void) DUK_SNPRINTF(duk_debug_file_stash, DUK_DEBUG_STASH_SIZE, "%s", (const char *) DUK_FILE_MACRO), \ + (void) (duk_debug_file_stash[DUK_DEBUG_STASH_SIZE - 1] = (char) 0), \ + (void) (duk_debug_line_stash = (duk_int_t) DUK_LINE_MACRO), \ + (void) DUK_SNPRINTF(duk_debug_func_stash, DUK_DEBUG_STASH_SIZE, "%s", (const char *) DUK_FUNC_MACRO), \ + (void) (duk_debug_func_stash[DUK_DEBUG_STASH_SIZE - 1] = (char) 0), \ + (void) (duk_debug_level_stash = (lev)) + +/* Without variadic macros resort to comma expression trickery to handle debug + * prints. This generates a lot of harmless warnings. These hacks are not + * needed normally because DUK_D() and friends will hide the entire debug log + * statement from the compiler. + */ + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 0) +#define DUK_DPRINT DUK__DEBUG_STASH(DUK_LEVEL_DEBUG), (void) duk_debug_log /* args go here in parens */ +#else +#define DUK_DPRINT 0 && /* args go here as a comma expression in parens */ +#endif + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 1) +#define DUK_DDPRINT DUK__DEBUG_STASH(DUK_LEVEL_DDEBUG), (void) duk_debug_log /* args go here in parens */ +#else +#define DUK_DDPRINT 0 && /* args */ +#endif + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) +#define DUK_DDDPRINT DUK__DEBUG_STASH(DUK_LEVEL_DDDEBUG), (void) duk_debug_log /* args go here in parens */ +#else +#define DUK_DDDPRINT 0 && /* args */ +#endif + +#endif /* DUK_USE_VARIADIC_MACROS */ + +#else /* DUK_USE_DEBUG */ + +/* + * Exposed debug macros: debugging disabled + */ + +#define DUK_D(x) do { } while (0) /* omit */ +#define DUK_DD(x) do { } while (0) /* omit */ +#define DUK_DDD(x) do { } while (0) /* omit */ + +#if defined(DUK_USE_VARIADIC_MACROS) + +#define DUK_DPRINT(...) +#define DUK_DDPRINT(...) +#define DUK_DDDPRINT(...) + +#else /* DUK_USE_VARIADIC_MACROS */ + +#define DUK_DPRINT 0 && /* args go here as a comma expression in parens */ +#define DUK_DDPRINT 0 && /* args */ +#define DUK_DDDPRINT 0 && /* args */ + +#endif /* DUK_USE_VARIADIC_MACROS */ + +#endif /* DUK_USE_DEBUG */ + +/* + * Structs + */ + +#if defined(DUK_USE_DEBUG) +struct duk_fixedbuffer { + duk_uint8_t *buffer; + duk_size_t length; + duk_size_t offset; + duk_bool_t truncated; +}; +#endif + +/* + * Prototypes + */ + +#if defined(DUK_USE_DEBUG) +DUK_INTERNAL_DECL duk_int_t duk_debug_vsnprintf(char *str, duk_size_t size, const char *format, va_list ap); +#if 0 /*unused*/ +DUK_INTERNAL_DECL duk_int_t duk_debug_snprintf(char *str, duk_size_t size, const char *format, ...); +#endif +DUK_INTERNAL_DECL void duk_debug_format_funcptr(char *buf, duk_size_t buf_size, duk_uint8_t *fptr, duk_size_t fptr_size); + +#if defined(DUK_USE_VARIADIC_MACROS) +DUK_INTERNAL_DECL void duk_debug_log(duk_int_t level, const char *file, duk_int_t line, const char *func, const char *fmt, ...); +#else /* DUK_USE_VARIADIC_MACROS */ +/* parameter passing, not thread safe */ +#define DUK_DEBUG_STASH_SIZE 128 +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL char duk_debug_file_stash[DUK_DEBUG_STASH_SIZE]; +DUK_INTERNAL_DECL duk_int_t duk_debug_line_stash; +DUK_INTERNAL_DECL char duk_debug_func_stash[DUK_DEBUG_STASH_SIZE]; +DUK_INTERNAL_DECL duk_int_t duk_debug_level_stash; +#endif +DUK_INTERNAL_DECL void duk_debug_log(const char *fmt, ...); +#endif /* DUK_USE_VARIADIC_MACROS */ + +DUK_INTERNAL_DECL void duk_fb_put_bytes(duk_fixedbuffer *fb, const duk_uint8_t *buffer, duk_size_t length); +DUK_INTERNAL_DECL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x); +DUK_INTERNAL_DECL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x); +DUK_INTERNAL_DECL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...); +DUK_INTERNAL_DECL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size); +DUK_INTERNAL_DECL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb); + +#endif /* DUK_USE_DEBUG */ + +#endif /* DUK_DEBUG_H_INCLUDED */ +/* #include duk_error.h */ +#line 1 "duk_error.h" +/* + * Error handling macros, assertion macro, error codes. + * + * There are three types of 'errors': + * + * 1. Ordinary errors relative to a thread, cause a longjmp, catchable. + * 2. Fatal errors relative to a heap, cause fatal handler to be called. + * 3. Fatal errors without context, cause the default (not heap specific) + * fatal handler to be called. + * + * Fatal errors without context are used by debug code such as assertions. + * By providing a fatal error handler for a Duktape heap, user code can + * avoid fatal errors without context in non-debug builds. + */ + +#if !defined(DUK_ERROR_H_INCLUDED) +#define DUK_ERROR_H_INCLUDED + +/* + * Error codes: defined in duktape.h + * + * Error codes are used as a shorthand to throw exceptions from inside + * the implementation. The appropriate ECMAScript object is constructed + * based on the code. ECMAScript code throws objects directly. The error + * codes are defined in the public API header because they are also used + * by calling code. + */ + +/* + * Normal error + * + * Normal error is thrown with a longjmp() through the current setjmp() + * catchpoint record in the duk_heap. The 'curr_thread' of the duk_heap + * identifies the throwing thread. + * + * Error formatting is usually unnecessary. The error macros provide a + * zero argument version (no formatting) and separate macros for small + * argument counts. Variadic macros are not used to avoid portability + * issues and avoid the need for stash-based workarounds when they're not + * available. Vararg calls are avoided for non-formatted error calls + * because vararg call sites are larger than normal, and there are a lot + * of call sites with no formatting. + * + * Note that special formatting provided by debug macros is NOT available. + * + * The _RAW variants allow the caller to specify file and line. This makes + * it easier to write checked calls which want to use the call site of the + * checked function, not the error macro call inside the checked function. + */ + +#if defined(DUK_USE_VERBOSE_ERRORS) + +/* Because there are quite many call sites, pack error code (require at most + * 8-bit) into a single argument. + */ +#define DUK_ERROR(thr,err,msg) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) DUK_LINE_MACRO; \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error((thr), DUK_FILE_MACRO, (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (msg)); \ + } while (0) +#define DUK_ERROR_RAW(thr,file,line,err,msg) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) (line); \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error((thr), (file), (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (msg)); \ + } while (0) + +#define DUK_ERROR_FMT1(thr,err,fmt,arg1) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) DUK_LINE_MACRO; \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), DUK_FILE_MACRO, (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1)); \ + } while (0) +#define DUK_ERROR_RAW_FMT1(thr,file,line,err,fmt,arg1) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) (line); \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), (file), (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1)); \ + } while (0) + +#define DUK_ERROR_FMT2(thr,err,fmt,arg1,arg2) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) DUK_LINE_MACRO; \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), DUK_FILE_MACRO, (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1), (arg2)); \ + } while (0) +#define DUK_ERROR_RAW_FMT2(thr,file,line,err,fmt,arg1,arg2) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) (line); \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), (file), (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1), (arg2)); \ + } while (0) + +#define DUK_ERROR_FMT3(thr,err,fmt,arg1,arg2,arg3) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) DUK_LINE_MACRO; \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), DUK_FILE_MACRO, (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1), (arg2), (arg3)); \ + } while (0) +#define DUK_ERROR_RAW_FMT3(thr,file,line,err,fmt,arg1,arg2,arg3) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) (line); \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), (file), (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1), (arg2), (arg3)); \ + } while (0) + +#define DUK_ERROR_FMT4(thr,err,fmt,arg1,arg2,arg3,arg4) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) DUK_LINE_MACRO; \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), DUK_FILE_MACRO, (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1), (arg2), (arg3), (arg4)); \ + } while (0) +#define DUK_ERROR_RAW_FMT4(thr,file,line,err,fmt,arg1,arg2,arg3,arg4) do { \ + duk_errcode_t duk__err = (err); duk_int_t duk__line = (duk_int_t) (line); \ + DUK_ASSERT(duk__err >= 0 && duk__err <= 0xff); DUK_ASSERT(duk__line >= 0 && duk__line <= 0x00ffffffL); \ + duk_err_handle_error_fmt((thr), (file), (((duk_uint_t) duk__err) << 24) | ((duk_uint_t) duk__line), (fmt), (arg1), (arg2), (arg3), (arg4)); \ + } while (0) + +#else /* DUK_USE_VERBOSE_ERRORS */ + +#define DUK_ERROR(thr,err,msg) duk_err_handle_error((thr), (err)) +#define DUK_ERROR_RAW(thr,file,line,err,msg) duk_err_handle_error((thr), (err)) + +#define DUK_ERROR_FMT1(thr,err,fmt,arg1) DUK_ERROR((thr),(err),(fmt)) +#define DUK_ERROR_RAW_FMT1(thr,file,line,err,fmt,arg1) DUK_ERROR_RAW((thr),(file),(line),(err),(fmt)) + +#define DUK_ERROR_FMT2(thr,err,fmt,arg1,arg2) DUK_ERROR((thr),(err),(fmt)) +#define DUK_ERROR_RAW_FMT2(thr,file,line,err,fmt,arg1,arg2) DUK_ERROR_RAW((thr),(file),(line),(err),(fmt)) + +#define DUK_ERROR_FMT3(thr,err,fmt,arg1,arg2,arg3) DUK_ERROR((thr),(err),(fmt)) +#define DUK_ERROR_RAW_FMT3(thr,file,line,err,fmt,arg1,arg2,arg3) DUK_ERROR_RAW((thr),(file),(line),(err),(fmt)) + +#define DUK_ERROR_FMT4(thr,err,fmt,arg1,arg2,arg3,arg4) DUK_ERROR((thr),(err),(fmt)) +#define DUK_ERROR_RAW_FMT4(thr,file,line,err,fmt,arg1,arg2,arg3,arg4) DUK_ERROR_RAW((thr),(file),(line),(err),(fmt)) + +#endif /* DUK_USE_VERBOSE_ERRORS */ + +/* + * Fatal error without context + * + * The macro is an expression to make it compatible with DUK_ASSERT_EXPR(). + */ + +#define DUK_FATAL_WITHOUT_CONTEXT(msg) \ + duk_default_fatal_handler(NULL, (msg)) + +/* + * Error throwing helpers + * + * The goal is to provide verbose and configurable error messages. Call + * sites should be clean in source code and compile to a small footprint. + * Small footprint is also useful for performance because small cold paths + * reduce code cache pressure. Adding macros here only makes sense if there + * are enough call sites to get concrete benefits. + * + * DUK_ERROR_xxx() macros are generic and can be used anywhere. + * + * DUK_DCERROR_xxx() macros can only be used in Duktape/C functions where + * the "return DUK_RET_xxx;" shorthand is available for low memory targets. + * The DUK_DCERROR_xxx() macros always either throw or perform a + * 'return DUK_RET_xxx' from the calling function. + */ + +#if defined(DUK_USE_VERBOSE_ERRORS) +/* Verbose errors with key/value summaries (non-paranoid) or without key/value + * summaries (paranoid, for some security sensitive environments), the paranoid + * vs. non-paranoid distinction affects only a few specific errors. + */ +#if defined(DUK_USE_PARANOID_ERRORS) +#define DUK_ERROR_REQUIRE_TYPE_INDEX(thr,idx,expectname,lowmemstr) do { \ + duk_err_require_type_index((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, (idx), (expectname)); \ + } while (0) +#else /* DUK_USE_PARANOID_ERRORS */ +#define DUK_ERROR_REQUIRE_TYPE_INDEX(thr,idx,expectname,lowmemstr) do { \ + duk_err_require_type_index((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, (idx), (expectname)); \ + } while (0) +#endif /* DUK_USE_PARANOID_ERRORS */ + +#define DUK_ERROR_INTERNAL(thr) do { \ + duk_err_error_internal((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO); \ + } while (0) +#define DUK_DCERROR_INTERNAL(thr) do { \ + DUK_ERROR_INTERNAL((thr)); \ + return 0; \ + } while (0) +#define DUK_ERROR_ALLOC_FAILED(thr) do { \ + duk_err_error_alloc_failed((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO); \ + } while (0) +#define DUK_ERROR_UNSUPPORTED(thr) do { \ + DUK_ERROR((thr), DUK_ERR_ERROR, DUK_STR_UNSUPPORTED); \ + } while (0) +#define DUK_ERROR_ERROR(thr,msg) do { \ + duk_err_error((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, (msg)); \ + } while (0) +#define DUK_ERROR_RANGE_INDEX(thr,idx) do { \ + duk_err_range_index((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, (idx)); \ + } while (0) +#define DUK_ERROR_RANGE_PUSH_BEYOND(thr) do { \ + duk_err_range_push_beyond((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO); \ + } while (0) +#define DUK_ERROR_RANGE_INVALID_ARGS(thr) do { \ + DUK_ERROR_RANGE((thr), DUK_STR_INVALID_ARGS); \ + } while (0) +#define DUK_DCERROR_RANGE_INVALID_ARGS(thr) do { \ + DUK_ERROR_RANGE_INVALID_ARGS((thr)); \ + return 0; \ + } while (0) +#define DUK_ERROR_RANGE_INVALID_COUNT(thr) do { \ + DUK_ERROR_RANGE((thr), DUK_STR_INVALID_COUNT); \ + } while (0) +#define DUK_DCERROR_RANGE_INVALID_COUNT(thr) do { \ + DUK_ERROR_RANGE_INVALID_COUNT((thr)); \ + return 0; \ + } while (0) +#define DUK_ERROR_RANGE_INVALID_LENGTH(thr) do { \ + DUK_ERROR_RANGE((thr), DUK_STR_INVALID_LENGTH); \ + } while (0) +#define DUK_DCERROR_RANGE_INVALID_LENGTH(thr) do { \ + DUK_ERROR_RANGE_INVALID_LENGTH((thr)); \ + return 0; \ + } while (0) +#define DUK_ERROR_RANGE(thr,msg) do { \ + duk_err_range((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO, (msg)); \ + } while (0) +#define DUK_ERROR_EVAL(thr,msg) do { \ + DUK_ERROR((thr), DUK_ERR_EVAL_ERROR, (msg)); \ + } while (0) +#define DUK_ERROR_REFERENCE(thr,msg) do { \ + DUK_ERROR((thr), DUK_ERR_REFERENCE_ERROR, (msg)); \ + } while (0) +#define DUK_ERROR_SYNTAX(thr,msg) do { \ + DUK_ERROR((thr), DUK_ERR_SYNTAX_ERROR, (msg)); \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_ARGS(thr) do { \ + duk_err_type_invalid_args((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO); \ + } while (0) +#define DUK_DCERROR_TYPE_INVALID_ARGS(thr) do { \ + DUK_ERROR_TYPE_INVALID_ARGS((thr)); \ + return 0; \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_STATE(thr) do { \ + duk_err_type_invalid_state((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO); \ + } while (0) +#define DUK_DCERROR_TYPE_INVALID_STATE(thr) do { \ + DUK_ERROR_TYPE_INVALID_STATE((thr)); \ + return 0; \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_TRAP_RESULT(thr) do { \ + duk_err_type_invalid_trap_result((thr), DUK_FILE_MACRO, (duk_int_t) DUK_LINE_MACRO); \ + } while (0) +#define DUK_DCERROR_TYPE_INVALID_TRAP_RESULT(thr) do { \ + DUK_ERROR_TYPE((thr), DUK_STR_INVALID_TRAP_RESULT); \ + } while (0) +#define DUK_ERROR_TYPE(thr,msg) do { \ + DUK_ERROR((thr), DUK_ERR_TYPE_ERROR, (msg)); \ + } while (0) +#define DUK_ERROR_URI(thr,msg) do { \ + DUK_ERROR((thr), DUK_ERR_URI_ERROR, (msg)); \ + } while (0) +#else /* DUK_USE_VERBOSE_ERRORS */ +/* Non-verbose errors for low memory targets: no file, line, or message. */ + +#define DUK_ERROR_REQUIRE_TYPE_INDEX(thr,idx,expectname,lowmemstr) do { \ + duk_err_type((thr)); \ + } while (0) + +#define DUK_ERROR_INTERNAL(thr) do { \ + duk_err_error((thr)); \ + } while (0) +#define DUK_DCERROR_INTERNAL(thr) do { \ + DUK_UNREF((thr)); \ + return DUK_RET_ERROR; \ + } while (0) +#define DUK_ERROR_ALLOC_FAILED(thr) do { \ + duk_err_error((thr)); \ + } while (0) +#define DUK_ERROR_UNSUPPORTED(thr) do { \ + duk_err_error((thr)); \ + } while (0) +#define DUK_ERROR_ERROR(thr,msg) do { \ + duk_err_error((thr)); \ + } while (0) +#define DUK_ERROR_RANGE_INDEX(thr,idx) do { \ + duk_err_range((thr)); \ + } while (0) +#define DUK_ERROR_RANGE_PUSH_BEYOND(thr) do { \ + duk_err_range((thr)); \ + } while (0) +#define DUK_ERROR_RANGE_INVALID_ARGS(thr) do { \ + duk_err_range((thr)); \ + } while (0) +#define DUK_DCERROR_RANGE_INVALID_ARGS(thr) do { \ + DUK_UNREF((thr)); \ + return DUK_RET_RANGE_ERROR; \ + } while (0) +#define DUK_ERROR_RANGE_INVALID_COUNT(thr) do { \ + duk_err_range((thr)); \ + } while (0) +#define DUK_DCERROR_RANGE_INVALID_COUNT(thr) do { \ + DUK_UNREF((thr)); \ + return DUK_RET_RANGE_ERROR; \ + } while (0) +#define DUK_ERROR_RANGE_INVALID_LENGTH(thr) do { \ + duk_err_range((thr)); \ + } while (0) +#define DUK_DCERROR_RANGE_INVALID_LENGTH(thr) do { \ + DUK_UNREF((thr)); \ + return DUK_RET_RANGE_ERROR; \ + } while (0) +#define DUK_ERROR_RANGE(thr,msg) do { \ + duk_err_range((thr)); \ + } while (0) +#define DUK_ERROR_EVAL(thr,msg) do { \ + duk_err_eval((thr)); \ + } while (0) +#define DUK_ERROR_REFERENCE(thr,msg) do { \ + duk_err_reference((thr)); \ + } while (0) +#define DUK_ERROR_SYNTAX(thr,msg) do { \ + duk_err_syntax((thr)); \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_ARGS(thr) do { \ + duk_err_type((thr)); \ + } while (0) +#define DUK_DCERROR_TYPE_INVALID_ARGS(thr) do { \ + DUK_UNREF((thr)); \ + return DUK_RET_TYPE_ERROR; \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_STATE(thr) do { \ + duk_err_type((thr)); \ + } while (0) +#define DUK_DCERROR_TYPE_INVALID_STATE(thr) do { \ + duk_err_type((thr)); \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_TRAP_RESULT(thr) do { \ + duk_err_type((thr)); \ + } while (0) +#define DUK_DCERROR_TYPE_INVALID_TRAP_RESULT(thr) do { \ + DUK_UNREF((thr)); \ + return DUK_RET_TYPE_ERROR; \ + } while (0) +#define DUK_ERROR_TYPE_INVALID_TRAP_RESULT(thr) do { \ + duk_err_type((thr)); \ + } while (0) +#define DUK_ERROR_TYPE(thr,msg) do { \ + duk_err_type((thr)); \ + } while (0) +#define DUK_ERROR_URI(thr,msg) do { \ + duk_err_uri((thr)); \ + } while (0) +#endif /* DUK_USE_VERBOSE_ERRORS */ + +/* + * Assert macro: failure causes a fatal error. + * + * NOTE: since the assert macro doesn't take a heap/context argument, there's + * no way to look up a heap/context specific fatal error handler which may have + * been given by the application. Instead, assertion failures always use the + * internal default fatal error handler; it can be replaced via duk_config.h + * and then applies to all Duktape heaps. + */ + +#if defined(DUK_USE_ASSERTIONS) + +/* The message should be a compile time constant without formatting (less risk); + * we don't care about assertion text size because they're not used in production + * builds. + */ +#define DUK_ASSERT(x) do { \ + if (!(x)) { \ + DUK_FATAL_WITHOUT_CONTEXT("assertion failed: " #x \ + " (" DUK_FILE_MACRO ":" DUK_MACRO_STRINGIFY(DUK_LINE_MACRO) ")"); \ + } \ + } while (0) + +/* Assertion compatible inside a comma expression, evaluates to void. */ +#define DUK_ASSERT_EXPR(x) \ + ((void) ((x) ? 0 : (DUK_FATAL_WITHOUT_CONTEXT("assertion failed: " #x \ + " (" DUK_FILE_MACRO ":" DUK_MACRO_STRINGIFY(DUK_LINE_MACRO) ")"), 0))) + +#else /* DUK_USE_ASSERTIONS */ + +#define DUK_ASSERT(x) do { /* assertion omitted */ } while (0) + +#define DUK_ASSERT_EXPR(x) ((void) 0) + +#endif /* DUK_USE_ASSERTIONS */ + +/* this variant is used when an assert would generate a compile warning by + * being always true (e.g. >= 0 comparison for an unsigned value + */ +#define DUK_ASSERT_DISABLE(x) do { /* assertion disabled */ } while (0) + +/* + * Assertion helpers + */ + +#if defined(DUK_USE_ASSERTIONS) && defined(DUK_USE_REFERENCE_COUNTING) +#define DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(h) do { \ + DUK_ASSERT((h) == NULL || DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) (h)) > 0); \ + } while (0) +#define DUK_ASSERT_REFCOUNT_NONZERO_TVAL(tv) do { \ + if ((tv) != NULL && DUK_TVAL_IS_HEAP_ALLOCATED((tv))) { \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(DUK_TVAL_GET_HEAPHDR((tv))) > 0); \ + } \ + } while (0) +#else +#define DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(h) /* no refcount check */ +#define DUK_ASSERT_REFCOUNT_NONZERO_TVAL(tv) /* no refcount check */ +#endif + +#define DUK_ASSERT_TOP(ctx,n) DUK_ASSERT((duk_idx_t) duk_get_top((ctx)) == (duk_idx_t) (n)) + +#if defined(DUK_USE_ASSERTIONS) && defined(DUK_USE_PACKED_TVAL) +#define DUK_ASSERT_DOUBLE_IS_NORMALIZED(dval) do { \ + duk_double_union duk__assert_tmp_du; \ + duk__assert_tmp_du.d = (dval); \ + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&duk__assert_tmp_du)); \ + } while (0) +#else +#define DUK_ASSERT_DOUBLE_IS_NORMALIZED(dval) /* nop */ +#endif + +#define DUK_ASSERT_VS_SPACE(thr) \ + DUK_ASSERT(thr->valstack_top < thr->valstack_end) + +/* + * Helper to initialize a memory area (e.g. struct) with garbage when + * assertions enabled. + */ + +#if defined(DUK_USE_ASSERTIONS) +#define DUK_ASSERT_SET_GARBAGE(ptr,size) do { \ + duk_memset_unsafe((void *) (ptr), 0x5a, size); \ + } while (0) +#else +#define DUK_ASSERT_SET_GARBAGE(ptr,size) do {} while (0) +#endif + +/* + * Helper for valstack space + * + * Caller of DUK_ASSERT_VALSTACK_SPACE() estimates the number of free stack entries + * required for its own use, and any child calls which are not (a) Duktape API calls + * or (b) Duktape calls which involve extending the valstack (e.g. getter call). + */ + +#define DUK_VALSTACK_ASSERT_EXTRA 5 /* this is added to checks to allow for Duktape + * API calls in addition to function's own use + */ +#if defined(DUK_USE_ASSERTIONS) +#define DUK_ASSERT_VALSTACK_SPACE(thr,n) do { \ + DUK_ASSERT((thr) != NULL); \ + DUK_ASSERT((thr)->valstack_end - (thr)->valstack_top >= (n) + DUK_VALSTACK_ASSERT_EXTRA); \ + } while (0) +#else +#define DUK_ASSERT_VALSTACK_SPACE(thr,n) /* no valstack space check */ +#endif + +/* + * Prototypes + */ + +#if defined(DUK_USE_VERBOSE_ERRORS) +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_handle_error(duk_hthread *thr, const char *filename, duk_uint_t line_and_code, const char *msg)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_handle_error_fmt(duk_hthread *thr, const char *filename, duk_uint_t line_and_code, const char *fmt, ...)); +#else /* DUK_USE_VERBOSE_ERRORS */ +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_handle_error(duk_hthread *thr, duk_errcode_t code)); +#endif /* DUK_USE_VERBOSE_ERRORS */ + +#if defined(DUK_USE_VERBOSE_ERRORS) +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_create_and_throw(duk_hthread *thr, duk_errcode_t code, const char *msg, const char *filename, duk_int_t line)); +#else +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_create_and_throw(duk_hthread *thr, duk_errcode_t code)); +#endif + +DUK_NORETURN(DUK_INTERNAL_DECL void duk_error_throw_from_negative_rc(duk_hthread *thr, duk_ret_t rc)); + +#define DUK_AUGMENT_FLAG_NOBLAME_FILELINE (1U << 0) /* if set, don't blame C file/line for .fileName and .lineNumber */ +#define DUK_AUGMENT_FLAG_SKIP_ONE (1U << 1) /* if set, skip topmost activation in traceback construction */ + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) +DUK_INTERNAL_DECL void duk_err_augment_error_create(duk_hthread *thr, duk_hthread *thr_callstack, const char *filename, duk_int_t line, duk_small_uint_t flags); +#endif +#if defined(DUK_USE_AUGMENT_ERROR_THROW) +DUK_INTERNAL_DECL void duk_err_augment_error_throw(duk_hthread *thr); +#endif + +#if defined(DUK_USE_VERBOSE_ERRORS) +#if defined(DUK_USE_PARANOID_ERRORS) +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_require_type_index(duk_hthread *thr, const char *filename, duk_int_t linenumber, duk_idx_t idx, const char *expect_name)); +#else +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_require_type_index(duk_hthread *thr, const char *filename, duk_int_t linenumber, duk_idx_t idx, const char *expect_name)); +#endif +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_error_internal(duk_hthread *thr, const char *filename, duk_int_t linenumber)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_error_alloc_failed(duk_hthread *thr, const char *filename, duk_int_t linenumber)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_error(duk_hthread *thr, const char *filename, duk_int_t linenumber, const char *message)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_range_index(duk_hthread *thr, const char *filename, duk_int_t linenumber, duk_idx_t idx)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_range_push_beyond(duk_hthread *thr, const char *filename, duk_int_t linenumber)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_range(duk_hthread *thr, const char *filename, duk_int_t linenumber, const char *message)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_type_invalid_args(duk_hthread *thr, const char *filename, duk_int_t linenumber)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_type_invalid_state(duk_hthread *thr, const char *filename, duk_int_t linenumber)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_type_invalid_trap_result(duk_hthread *thr, const char *filename, duk_int_t linenumber)); +#else /* DUK_VERBOSE_ERRORS */ +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_error(duk_hthread *thr)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_range(duk_hthread *thr)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_eval(duk_hthread *thr)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_reference(duk_hthread *thr)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_syntax(duk_hthread *thr)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_type(duk_hthread *thr)); +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_uri(duk_hthread *thr)); +#endif /* DUK_VERBOSE_ERRORS */ + +DUK_NORETURN(DUK_INTERNAL_DECL void duk_err_longjmp(duk_hthread *thr)); + +DUK_NORETURN(DUK_INTERNAL_DECL void duk_default_fatal_handler(void *udata, const char *msg)); + +DUK_INTERNAL_DECL void duk_err_setup_ljstate1(duk_hthread *thr, duk_small_uint_t lj_type, duk_tval *tv_val); +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_INTERNAL_DECL void duk_err_check_debugger_integration(duk_hthread *thr); +#endif + +DUK_INTERNAL_DECL duk_hobject *duk_error_prototype_from_code(duk_hthread *thr, duk_errcode_t err_code); + +#endif /* DUK_ERROR_H_INCLUDED */ +/* #include duk_unicode.h */ +#line 1 "duk_unicode.h" +/* + * Unicode helpers + */ + +#if !defined(DUK_UNICODE_H_INCLUDED) +#define DUK_UNICODE_H_INCLUDED + +/* + * UTF-8 / XUTF-8 / CESU-8 constants + */ + +#define DUK_UNICODE_MAX_XUTF8_LENGTH 7 /* up to 36 bit codepoints */ +#define DUK_UNICODE_MAX_XUTF8_BMP_LENGTH 3 /* all codepoints up to U+FFFF */ +#define DUK_UNICODE_MAX_CESU8_LENGTH 6 /* all codepoints up to U+10FFFF */ +#define DUK_UNICODE_MAX_CESU8_BMP_LENGTH 3 /* all codepoints up to U+FFFF */ + +/* + * Useful Unicode codepoints + * + * Integer constants must be signed to avoid unexpected coercions + * in comparisons. + */ + +#define DUK_UNICODE_CP_ZWNJ 0x200cL /* zero-width non-joiner */ +#define DUK_UNICODE_CP_ZWJ 0x200dL /* zero-width joiner */ +#define DUK_UNICODE_CP_REPLACEMENT_CHARACTER 0xfffdL /* http://en.wikipedia.org/wiki/Replacement_character#Replacement_character */ + +/* + * ASCII character constants + * + * C character literals like 'x' have a platform specific value and do + * not match ASCII (UTF-8) values on e.g. EBCDIC platforms. So, use + * these (admittedly awkward) constants instead. These constants must + * also have signed values to avoid unexpected coercions in comparisons. + * + * http://en.wikipedia.org/wiki/ASCII + */ + +#define DUK_ASC_NUL 0x00 +#define DUK_ASC_SOH 0x01 +#define DUK_ASC_STX 0x02 +#define DUK_ASC_ETX 0x03 +#define DUK_ASC_EOT 0x04 +#define DUK_ASC_ENQ 0x05 +#define DUK_ASC_ACK 0x06 +#define DUK_ASC_BEL 0x07 +#define DUK_ASC_BS 0x08 +#define DUK_ASC_HT 0x09 +#define DUK_ASC_LF 0x0a +#define DUK_ASC_VT 0x0b +#define DUK_ASC_FF 0x0c +#define DUK_ASC_CR 0x0d +#define DUK_ASC_SO 0x0e +#define DUK_ASC_SI 0x0f +#define DUK_ASC_DLE 0x10 +#define DUK_ASC_DC1 0x11 +#define DUK_ASC_DC2 0x12 +#define DUK_ASC_DC3 0x13 +#define DUK_ASC_DC4 0x14 +#define DUK_ASC_NAK 0x15 +#define DUK_ASC_SYN 0x16 +#define DUK_ASC_ETB 0x17 +#define DUK_ASC_CAN 0x18 +#define DUK_ASC_EM 0x19 +#define DUK_ASC_SUB 0x1a +#define DUK_ASC_ESC 0x1b +#define DUK_ASC_FS 0x1c +#define DUK_ASC_GS 0x1d +#define DUK_ASC_RS 0x1e +#define DUK_ASC_US 0x1f +#define DUK_ASC_SPACE 0x20 +#define DUK_ASC_EXCLAMATION 0x21 +#define DUK_ASC_DOUBLEQUOTE 0x22 +#define DUK_ASC_HASH 0x23 +#define DUK_ASC_DOLLAR 0x24 +#define DUK_ASC_PERCENT 0x25 +#define DUK_ASC_AMP 0x26 +#define DUK_ASC_SINGLEQUOTE 0x27 +#define DUK_ASC_LPAREN 0x28 +#define DUK_ASC_RPAREN 0x29 +#define DUK_ASC_STAR 0x2a +#define DUK_ASC_PLUS 0x2b +#define DUK_ASC_COMMA 0x2c +#define DUK_ASC_MINUS 0x2d +#define DUK_ASC_PERIOD 0x2e +#define DUK_ASC_SLASH 0x2f +#define DUK_ASC_0 0x30 +#define DUK_ASC_1 0x31 +#define DUK_ASC_2 0x32 +#define DUK_ASC_3 0x33 +#define DUK_ASC_4 0x34 +#define DUK_ASC_5 0x35 +#define DUK_ASC_6 0x36 +#define DUK_ASC_7 0x37 +#define DUK_ASC_8 0x38 +#define DUK_ASC_9 0x39 +#define DUK_ASC_COLON 0x3a +#define DUK_ASC_SEMICOLON 0x3b +#define DUK_ASC_LANGLE 0x3c +#define DUK_ASC_EQUALS 0x3d +#define DUK_ASC_RANGLE 0x3e +#define DUK_ASC_QUESTION 0x3f +#define DUK_ASC_ATSIGN 0x40 +#define DUK_ASC_UC_A 0x41 +#define DUK_ASC_UC_B 0x42 +#define DUK_ASC_UC_C 0x43 +#define DUK_ASC_UC_D 0x44 +#define DUK_ASC_UC_E 0x45 +#define DUK_ASC_UC_F 0x46 +#define DUK_ASC_UC_G 0x47 +#define DUK_ASC_UC_H 0x48 +#define DUK_ASC_UC_I 0x49 +#define DUK_ASC_UC_J 0x4a +#define DUK_ASC_UC_K 0x4b +#define DUK_ASC_UC_L 0x4c +#define DUK_ASC_UC_M 0x4d +#define DUK_ASC_UC_N 0x4e +#define DUK_ASC_UC_O 0x4f +#define DUK_ASC_UC_P 0x50 +#define DUK_ASC_UC_Q 0x51 +#define DUK_ASC_UC_R 0x52 +#define DUK_ASC_UC_S 0x53 +#define DUK_ASC_UC_T 0x54 +#define DUK_ASC_UC_U 0x55 +#define DUK_ASC_UC_V 0x56 +#define DUK_ASC_UC_W 0x57 +#define DUK_ASC_UC_X 0x58 +#define DUK_ASC_UC_Y 0x59 +#define DUK_ASC_UC_Z 0x5a +#define DUK_ASC_LBRACKET 0x5b +#define DUK_ASC_BACKSLASH 0x5c +#define DUK_ASC_RBRACKET 0x5d +#define DUK_ASC_CARET 0x5e +#define DUK_ASC_UNDERSCORE 0x5f +#define DUK_ASC_GRAVE 0x60 +#define DUK_ASC_LC_A 0x61 +#define DUK_ASC_LC_B 0x62 +#define DUK_ASC_LC_C 0x63 +#define DUK_ASC_LC_D 0x64 +#define DUK_ASC_LC_E 0x65 +#define DUK_ASC_LC_F 0x66 +#define DUK_ASC_LC_G 0x67 +#define DUK_ASC_LC_H 0x68 +#define DUK_ASC_LC_I 0x69 +#define DUK_ASC_LC_J 0x6a +#define DUK_ASC_LC_K 0x6b +#define DUK_ASC_LC_L 0x6c +#define DUK_ASC_LC_M 0x6d +#define DUK_ASC_LC_N 0x6e +#define DUK_ASC_LC_O 0x6f +#define DUK_ASC_LC_P 0x70 +#define DUK_ASC_LC_Q 0x71 +#define DUK_ASC_LC_R 0x72 +#define DUK_ASC_LC_S 0x73 +#define DUK_ASC_LC_T 0x74 +#define DUK_ASC_LC_U 0x75 +#define DUK_ASC_LC_V 0x76 +#define DUK_ASC_LC_W 0x77 +#define DUK_ASC_LC_X 0x78 +#define DUK_ASC_LC_Y 0x79 +#define DUK_ASC_LC_Z 0x7a +#define DUK_ASC_LCURLY 0x7b +#define DUK_ASC_PIPE 0x7c +#define DUK_ASC_RCURLY 0x7d +#define DUK_ASC_TILDE 0x7e +#define DUK_ASC_DEL 0x7f + +/* + * Miscellaneous + */ + +/* Uppercase A is 0x41, lowercase a is 0x61; OR 0x20 to convert uppercase + * to lowercase. + */ +#define DUK_LOWERCASE_CHAR_ASCII(x) ((x) | 0x20) + +/* + * Unicode tables + */ + +#if defined(DUK_USE_SOURCE_NONBMP) +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_ids_noa[1063]; +#else +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_ids_noabmp[626]; +#endif + +#if defined(DUK_USE_SOURCE_NONBMP) +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_ids_m_let_noa[42]; +#else +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_ids_m_let_noabmp[24]; +#endif + +#if defined(DUK_USE_SOURCE_NONBMP) +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_idp_m_ids_noa[549]; +#else +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_idp_m_ids_noabmp[358]; +#endif + +/* + * Automatically generated by extract_caseconv.py, do not edit! + */ + +extern const duk_uint8_t duk_unicode_caseconv_uc[1386]; +extern const duk_uint8_t duk_unicode_caseconv_lc[680]; + +#if defined(DUK_USE_REGEXP_CANON_WORKAROUND) +/* + * Automatically generated by extract_caseconv.py, do not edit! + */ + +extern const duk_uint16_t duk_unicode_re_canon_lookup[65536]; +#endif + +#if defined(DUK_USE_REGEXP_CANON_BITMAP) +/* + * Automatically generated by extract_caseconv.py, do not edit! + */ + +#define DUK_CANON_BITMAP_BLKSIZE 32 +#define DUK_CANON_BITMAP_BLKSHIFT 5 +#define DUK_CANON_BITMAP_BLKMASK 31 +extern const duk_uint8_t duk_unicode_re_canon_bitmap[256]; +#endif + +/* + * Extern + */ + +/* duk_unicode_support.c */ +#if !defined(DUK_SINGLE_FILE) +DUK_INTERNAL_DECL const duk_uint8_t duk_unicode_xutf8_markers[7]; +DUK_INTERNAL_DECL const duk_uint16_t duk_unicode_re_ranges_digit[2]; +DUK_INTERNAL_DECL const duk_uint16_t duk_unicode_re_ranges_white[22]; +DUK_INTERNAL_DECL const duk_uint16_t duk_unicode_re_ranges_wordchar[8]; +DUK_INTERNAL_DECL const duk_uint16_t duk_unicode_re_ranges_not_digit[4]; +DUK_INTERNAL_DECL const duk_uint16_t duk_unicode_re_ranges_not_white[24]; +DUK_INTERNAL_DECL const duk_uint16_t duk_unicode_re_ranges_not_wordchar[10]; +DUK_INTERNAL_DECL const duk_int8_t duk_is_idchar_tab[128]; +#endif /* !DUK_SINGLE_FILE */ + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_get_xutf8_length(duk_ucodepoint_t cp); +#if defined(DUK_USE_ASSERTIONS) +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_get_cesu8_length(duk_ucodepoint_t cp); +#endif +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_encode_xutf8(duk_ucodepoint_t cp, duk_uint8_t *out); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_encode_cesu8(duk_ucodepoint_t cp, duk_uint8_t *out); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_decode_xutf8(duk_hthread *thr, const duk_uint8_t **ptr, const duk_uint8_t *ptr_start, const duk_uint8_t *ptr_end, duk_ucodepoint_t *out_cp); +DUK_INTERNAL_DECL duk_ucodepoint_t duk_unicode_decode_xutf8_checked(duk_hthread *thr, const duk_uint8_t **ptr, const duk_uint8_t *ptr_start, const duk_uint8_t *ptr_end); +DUK_INTERNAL_DECL duk_size_t duk_unicode_unvalidated_utf8_length(const duk_uint8_t *data, duk_size_t blen); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_is_whitespace(duk_codepoint_t cp); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_is_line_terminator(duk_codepoint_t cp); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_is_identifier_start(duk_codepoint_t cp); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_is_identifier_part(duk_codepoint_t cp); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_is_letter(duk_codepoint_t cp); +DUK_INTERNAL_DECL void duk_unicode_case_convert_string(duk_hthread *thr, duk_bool_t uppercase); +#if defined(DUK_USE_REGEXP_SUPPORT) +DUK_INTERNAL_DECL duk_codepoint_t duk_unicode_re_canonicalize_char(duk_hthread *thr, duk_codepoint_t cp); +DUK_INTERNAL_DECL duk_small_int_t duk_unicode_re_is_wordchar(duk_codepoint_t cp); +#endif + +#endif /* DUK_UNICODE_H_INCLUDED */ +/* #include duk_json.h */ +#line 1 "duk_json.h" +/* + * Defines for JSON, especially duk_bi_json.c. + */ + +#if !defined(DUK_JSON_H_INCLUDED) +#define DUK_JSON_H_INCLUDED + +/* Encoding/decoding flags */ +#define DUK_JSON_FLAG_ASCII_ONLY (1U << 0) /* escape any non-ASCII characters */ +#define DUK_JSON_FLAG_AVOID_KEY_QUOTES (1U << 1) /* avoid key quotes when key is an ASCII Identifier */ +#define DUK_JSON_FLAG_EXT_CUSTOM (1U << 2) /* extended types: custom encoding */ +#define DUK_JSON_FLAG_EXT_COMPATIBLE (1U << 3) /* extended types: compatible encoding */ + +/* How much stack to require on entry to object/array encode */ +#define DUK_JSON_ENC_REQSTACK 32 + +/* How much stack to require on entry to object/array decode */ +#define DUK_JSON_DEC_REQSTACK 32 + +/* How large a loop detection stack to use */ +#define DUK_JSON_ENC_LOOPARRAY 64 + +/* Encoding state. Heap object references are all borrowed. */ +typedef struct { + duk_hthread *thr; + duk_bufwriter_ctx bw; /* output bufwriter */ + duk_hobject *h_replacer; /* replacer function */ + duk_hstring *h_gap; /* gap (if empty string, NULL) */ + duk_idx_t idx_proplist; /* explicit PropertyList */ + duk_idx_t idx_loop; /* valstack index of loop detection object */ + duk_small_uint_t flags; + duk_small_uint_t flag_ascii_only; + duk_small_uint_t flag_avoid_key_quotes; +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + duk_small_uint_t flag_ext_custom; + duk_small_uint_t flag_ext_compatible; + duk_small_uint_t flag_ext_custom_or_compatible; +#endif + duk_uint_t recursion_depth; + duk_uint_t recursion_limit; + duk_uint_t mask_for_undefined; /* type bit mask: types which certainly produce 'undefined' */ +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + duk_small_uint_t stridx_custom_undefined; + duk_small_uint_t stridx_custom_nan; + duk_small_uint_t stridx_custom_neginf; + duk_small_uint_t stridx_custom_posinf; + duk_small_uint_t stridx_custom_function; +#endif + duk_hobject *visiting[DUK_JSON_ENC_LOOPARRAY]; /* indexed by recursion_depth */ +} duk_json_enc_ctx; + +typedef struct { + duk_hthread *thr; + const duk_uint8_t *p; + const duk_uint8_t *p_start; + const duk_uint8_t *p_end; + duk_idx_t idx_reviver; + duk_small_uint_t flags; +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + duk_small_uint_t flag_ext_custom; + duk_small_uint_t flag_ext_compatible; + duk_small_uint_t flag_ext_custom_or_compatible; +#endif + duk_int_t recursion_depth; + duk_int_t recursion_limit; +} duk_json_dec_ctx; + +#endif /* DUK_JSON_H_INCLUDED */ +/* #include duk_js.h */ +#line 1 "duk_js.h" +/* + * ECMAScript execution, support primitives. + */ + +#if !defined(DUK_JS_H_INCLUDED) +#define DUK_JS_H_INCLUDED + +/* Flags for call handling. Lowest flags must match bytecode DUK_BC_CALL_FLAG_xxx 1:1. */ +#define DUK_CALL_FLAG_TAILCALL (1U << 0) /* setup for a tail call */ +#define DUK_CALL_FLAG_CONSTRUCT (1U << 1) /* constructor call (i.e. called as 'new Foo()') */ +#define DUK_CALL_FLAG_CALLED_AS_EVAL (1U << 2) /* call was made using the identifier 'eval' */ +#define DUK_CALL_FLAG_ALLOW_ECMATOECMA (1U << 3) /* ecma-to-ecma call with executor reuse is possible */ +#define DUK_CALL_FLAG_DIRECT_EVAL (1U << 4) /* call is a direct eval call */ +#define DUK_CALL_FLAG_CONSTRUCT_PROXY (1U << 5) /* handled via 'construct' proxy trap, check return value invariant(s) */ +#define DUK_CALL_FLAG_DEFAULT_INSTANCE_UPDATED (1U << 6) /* prototype of 'default instance' updated, temporary flag in call handling */ + +/* Flags for duk_js_equals_helper(). */ +#define DUK_EQUALS_FLAG_SAMEVALUE (1U << 0) /* use SameValue instead of non-strict equality */ +#define DUK_EQUALS_FLAG_STRICT (1U << 1) /* use strict equality instead of non-strict equality */ + +/* Flags for duk_js_compare_helper(). */ +#define DUK_COMPARE_FLAG_NEGATE (1U << 0) /* negate result */ +#define DUK_COMPARE_FLAG_EVAL_LEFT_FIRST (1U << 1) /* eval left argument first */ + +/* conversions, coercions, comparison, etc */ +DUK_INTERNAL_DECL duk_bool_t duk_js_toboolean(duk_tval *tv); +DUK_INTERNAL_DECL duk_double_t duk_js_tonumber(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL duk_double_t duk_js_tointeger_number(duk_double_t x); +DUK_INTERNAL_DECL duk_double_t duk_js_tointeger(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL duk_uint32_t duk_js_touint32(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL duk_int32_t duk_js_toint32(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL duk_uint16_t duk_js_touint16(duk_hthread *thr, duk_tval *tv); +DUK_INTERNAL_DECL duk_uarridx_t duk_js_to_arrayindex_string(const duk_uint8_t *str, duk_uint32_t blen); +#if !defined(DUK_USE_HSTRING_ARRIDX) +DUK_INTERNAL_DECL duk_uarridx_t duk_js_to_arrayindex_hstring_fast_known(duk_hstring *h); +DUK_INTERNAL_DECL duk_uarridx_t duk_js_to_arrayindex_hstring_fast(duk_hstring *h); +#endif +DUK_INTERNAL_DECL duk_bool_t duk_js_equals_helper(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_t flags); +DUK_INTERNAL_DECL duk_small_int_t duk_js_data_compare(const duk_uint8_t *buf1, const duk_uint8_t *buf2, duk_size_t len1, duk_size_t len2); +DUK_INTERNAL_DECL duk_small_int_t duk_js_string_compare(duk_hstring *h1, duk_hstring *h2); +#if 0 /* unused */ +DUK_INTERNAL_DECL duk_small_int_t duk_js_buffer_compare(duk_heap *heap, duk_hbuffer *h1, duk_hbuffer *h2); +#endif +DUK_INTERNAL_DECL duk_bool_t duk_js_compare_helper(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_t flags); +DUK_INTERNAL_DECL duk_bool_t duk_js_instanceof(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y); +#if defined(DUK_USE_SYMBOL_BUILTIN) +DUK_INTERNAL_DECL duk_bool_t duk_js_instanceof_ordinary(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y); +#endif +DUK_INTERNAL_DECL duk_bool_t duk_js_in(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y); +DUK_INTERNAL_DECL duk_small_uint_t duk_js_typeof_stridx(duk_tval *tv_x); + +/* arithmetic */ +DUK_INTERNAL_DECL double duk_js_arith_pow(double x, double y); +DUK_INTERNAL_DECL double duk_js_arith_mod(double x, double y); + +#define duk_js_equals(thr,tv_x,tv_y) \ + duk_js_equals_helper((thr), (tv_x), (tv_y), 0) +#define duk_js_strict_equals(tv_x,tv_y) \ + duk_js_equals_helper(NULL, (tv_x), (tv_y), DUK_EQUALS_FLAG_STRICT) +#define duk_js_samevalue(tv_x,tv_y) \ + duk_js_equals_helper(NULL, (tv_x), (tv_y), DUK_EQUALS_FLAG_SAMEVALUE) + +/* E5 Sections 11.8.1, 11.8.5; x < y */ +#define duk_js_lessthan(thr,tv_x,tv_y) \ + duk_js_compare_helper((thr), (tv_x), (tv_Y), DUK_COMPARE_FLAG_EVAL_LEFT_FIRST) + +/* E5 Sections 11.8.2, 11.8.5; x > y --> y < x */ +#define duk_js_greaterthan(thr,tv_x,tv_y) \ + duk_js_compare_helper((thr), (tv_y), (tv_x), 0) + +/* E5 Sections 11.8.3, 11.8.5; x <= y --> not (x > y) --> not (y < x) */ +#define duk_js_lessthanorequal(thr,tv_x,tv_y) \ + duk_js_compare_helper((thr), (tv_y), (tv_x), DUK_COMPARE_FLAG_NEGATE) + +/* E5 Sections 11.8.4, 11.8.5; x >= y --> not (x < y) */ +#define duk_js_greaterthanorequal(thr,tv_x,tv_y) \ + duk_js_compare_helper((thr), (tv_x), (tv_y), DUK_COMPARE_FLAG_EVAL_LEFT_FIRST | DUK_COMPARE_FLAG_NEGATE) + +/* identifiers and environment handling */ +#if 0 /*unused*/ +DUK_INTERNAL duk_bool_t duk_js_hasvar_envrec(duk_hthread *thr, duk_hobject *env, duk_hstring *name); +#endif +DUK_INTERNAL_DECL duk_bool_t duk_js_getvar_envrec(duk_hthread *thr, duk_hobject *env, duk_hstring *name, duk_bool_t throw_flag); +DUK_INTERNAL_DECL duk_bool_t duk_js_getvar_activation(duk_hthread *thr, duk_activation *act, duk_hstring *name, duk_bool_t throw_flag); +DUK_INTERNAL_DECL void duk_js_putvar_envrec(duk_hthread *thr, duk_hobject *env, duk_hstring *name, duk_tval *val, duk_bool_t strict); +DUK_INTERNAL_DECL void duk_js_putvar_activation(duk_hthread *thr, duk_activation *act, duk_hstring *name, duk_tval *val, duk_bool_t strict); +#if 0 /*unused*/ +DUK_INTERNAL_DECL duk_bool_t duk_js_delvar_envrec(duk_hthread *thr, duk_hobject *env, duk_hstring *name); +#endif +DUK_INTERNAL_DECL duk_bool_t duk_js_delvar_activation(duk_hthread *thr, duk_activation *act, duk_hstring *name); +DUK_INTERNAL_DECL duk_bool_t duk_js_declvar_activation(duk_hthread *thr, duk_activation *act, duk_hstring *name, duk_tval *val, duk_small_uint_t prop_flags, duk_bool_t is_func_decl); +DUK_INTERNAL_DECL void duk_js_init_activation_environment_records_delayed(duk_hthread *thr, duk_activation *act); +DUK_INTERNAL_DECL void duk_js_close_environment_record(duk_hthread *thr, duk_hobject *env); +DUK_INTERNAL_DECL duk_hobject *duk_create_activation_environment_record(duk_hthread *thr, duk_hobject *func, duk_size_t bottom_byteoff); +DUK_INTERNAL_DECL void duk_js_push_closure(duk_hthread *thr, + duk_hcompfunc *fun_temp, + duk_hobject *outer_var_env, + duk_hobject *outer_lex_env, + duk_bool_t add_auto_proto); + +/* call handling */ +DUK_INTERNAL_DECL duk_int_t duk_handle_call_unprotected(duk_hthread *thr, duk_idx_t idx_func, duk_small_uint_t call_flags); +DUK_INTERNAL_DECL duk_int_t duk_handle_call_unprotected_nargs(duk_hthread *thr, duk_idx_t nargs, duk_small_uint_t call_flags); +DUK_INTERNAL_DECL duk_int_t duk_handle_safe_call(duk_hthread *thr, duk_safe_call_function func, void *udata, duk_idx_t num_stack_args, duk_idx_t num_stack_res); +DUK_INTERNAL_DECL void duk_call_construct_postprocess(duk_hthread *thr, duk_small_uint_t proxy_invariant); +#if defined(DUK_USE_VERBOSE_ERRORS) +DUK_INTERNAL_DECL void duk_call_setup_propcall_error(duk_hthread *thr, duk_tval *tv_targ, duk_tval *tv_base, duk_tval *tv_key); +#endif + +/* bytecode execution */ +DUK_INTERNAL_DECL void duk_js_execute_bytecode(duk_hthread *exec_thr); + +#endif /* DUK_JS_H_INCLUDED */ +/* #include duk_numconv.h */ +#line 1 "duk_numconv.h" +/* + * Number-to-string conversion. The semantics of these is very tightly + * bound with the ECMAScript semantics required for call sites. + */ + +#if !defined(DUK_NUMCONV_H_INCLUDED) +#define DUK_NUMCONV_H_INCLUDED + +/* Output a specified number of digits instead of using the shortest + * form. Used for toPrecision() and toFixed(). + */ +#define DUK_N2S_FLAG_FIXED_FORMAT (1U << 0) + +/* Force exponential format. Used for toExponential(). */ +#define DUK_N2S_FLAG_FORCE_EXP (1U << 1) + +/* If number would need zero padding (for whole number part), use + * exponential format instead. E.g. if input number is 12300, 3 + * digits are generated ("123"), output "1.23e+4" instead of "12300". + * Used for toPrecision(). + */ +#define DUK_N2S_FLAG_NO_ZERO_PAD (1U << 2) + +/* Digit count indicates number of fractions (i.e. an absolute + * digit index instead of a relative one). Used together with + * DUK_N2S_FLAG_FIXED_FORMAT for toFixed(). + */ +#define DUK_N2S_FLAG_FRACTION_DIGITS (1U << 3) + +/* + * String-to-number conversion + */ + +/* Maximum exponent value when parsing numbers. This is not strictly + * compliant as there should be no upper limit, but as we parse the + * exponent without a bigint, impose some limit. The limit should be + * small enough that multiplying it (or limit-1 to be precise) won't + * overflow signed 32-bit integer range. Exponent is only parsed with + * radix 10, but with maximum radix (36) a safe limit is: + * (10000000*36).toString(16) -> '15752a00' + */ +#define DUK_S2N_MAX_EXPONENT 10000000L + +/* Trim white space (= allow leading and trailing whitespace) */ +#define DUK_S2N_FLAG_TRIM_WHITE (1U << 0) + +/* Allow exponent */ +#define DUK_S2N_FLAG_ALLOW_EXP (1U << 1) + +/* Allow trailing garbage (e.g. treat "123foo" as "123) */ +#define DUK_S2N_FLAG_ALLOW_GARBAGE (1U << 2) + +/* Allow leading plus sign */ +#define DUK_S2N_FLAG_ALLOW_PLUS (1U << 3) + +/* Allow leading minus sign */ +#define DUK_S2N_FLAG_ALLOW_MINUS (1U << 4) + +/* Allow 'Infinity' */ +#define DUK_S2N_FLAG_ALLOW_INF (1U << 5) + +/* Allow fraction part */ +#define DUK_S2N_FLAG_ALLOW_FRAC (1U << 6) + +/* Allow naked fraction (e.g. ".123") */ +#define DUK_S2N_FLAG_ALLOW_NAKED_FRAC (1U << 7) + +/* Allow empty fraction (e.g. "123.") */ +#define DUK_S2N_FLAG_ALLOW_EMPTY_FRAC (1U << 8) + +/* Allow empty string to be interpreted as 0 */ +#define DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO (1U << 9) + +/* Allow leading zeroes (e.g. "0123" -> "123") */ +#define DUK_S2N_FLAG_ALLOW_LEADING_ZERO (1U << 10) + +/* Allow automatic detection of hex base ("0x" or "0X" prefix), + * overrides radix argument and forces integer mode. + */ +#define DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT (1U << 11) + +/* Allow automatic detection of legacy octal base ("0n"), + * overrides radix argument and forces integer mode. + */ +#define DUK_S2N_FLAG_ALLOW_AUTO_LEGACY_OCT_INT (1U << 12) + +/* Allow automatic detection of ES2015 octal base ("0o123"), + * overrides radix argument and forces integer mode. + */ +#define DUK_S2N_FLAG_ALLOW_AUTO_OCT_INT (1U << 13) + +/* Allow automatic detection of ES2015 binary base ("0b10001"), + * overrides radix argument and forces integer mode. + */ +#define DUK_S2N_FLAG_ALLOW_AUTO_BIN_INT (1U << 14) + +/* + * Prototypes + */ + +DUK_INTERNAL_DECL void duk_numconv_stringify(duk_hthread *thr, duk_small_int_t radix, duk_small_int_t digits, duk_small_uint_t flags); +DUK_INTERNAL_DECL void duk_numconv_parse(duk_hthread *thr, duk_small_int_t radix, duk_small_uint_t flags); + +#endif /* DUK_NUMCONV_H_INCLUDED */ +/* #include duk_bi_protos.h */ +#line 1 "duk_bi_protos.h" +/* + * Prototypes for built-in functions not automatically covered by the + * header declarations emitted by genbuiltins.py. + */ + +#if !defined(DUK_BUILTIN_PROTOS_H_INCLUDED) +#define DUK_BUILTIN_PROTOS_H_INCLUDED + +/* Buffer size needed for ISO 8601 formatting. + * Accurate value is 32 + 1 for NUL termination: + * >>> len('+123456-01-23T12:34:56.123+12:34') + * 32 + * Include additional space to be safe. + */ +#define DUK_BI_DATE_ISO8601_BUFSIZE 40 + +/* Helpers exposed for internal use */ +DUK_INTERNAL_DECL void duk_bi_date_timeval_to_parts(duk_double_t d, duk_int_t *parts, duk_double_t *dparts, duk_small_uint_t flags); +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_timeval_from_dparts(duk_double_t *dparts, duk_small_uint_t flags); +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_is_leap_year(duk_int_t year); +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_timeval_in_valid_range(duk_double_t x); +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_year_in_valid_range(duk_double_t year); +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_timeval_in_leeway_range(duk_double_t x); +/* Built-in providers */ +#if defined(DUK_USE_DATE_NOW_GETTIMEOFDAY) +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_now_gettimeofday(void); +#endif +#if defined(DUK_USE_DATE_NOW_TIME) +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_now_time(void); +#endif +#if defined(DUK_USE_DATE_NOW_WINDOWS) +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_now_windows(void); +#endif +#if defined(DUK_USE_DATE_NOW_WINDOWS_SUBMS) +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_now_windows_subms(void); +#endif +#if defined(DUK_USE_DATE_TZO_GMTIME_R) || defined(DUK_USE_DATE_TZO_GMTIME_S) || defined(DUK_USE_DATE_TZO_GMTIME) +DUK_INTERNAL_DECL duk_int_t duk_bi_date_get_local_tzoffset_gmtime(duk_double_t d); +#endif +#if defined(DUK_USE_DATE_TZO_WINDOWS) +DUK_INTERNAL_DECL duk_int_t duk_bi_date_get_local_tzoffset_windows(duk_double_t d); +#endif +#if defined(DUK_USE_DATE_TZO_WINDOWS_NO_DST) +DUK_INTERNAL_DECL duk_int_t duk_bi_date_get_local_tzoffset_windows_no_dst(duk_double_t d); +#endif +#if defined(DUK_USE_DATE_PRS_STRPTIME) +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_parse_string_strptime(duk_hthread *thr, const char *str); +#endif +#if defined(DUK_USE_DATE_PRS_GETDATE) +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_parse_string_getdate(duk_hthread *thr, const char *str); +#endif +#if defined(DUK_USE_DATE_FMT_STRFTIME) +DUK_INTERNAL_DECL duk_bool_t duk_bi_date_format_parts_strftime(duk_hthread *thr, duk_int_t *parts, duk_int_t tzoffset, duk_small_uint_t flags); +#endif + +#if defined(DUK_USE_GET_MONOTONIC_TIME_CLOCK_GETTIME) +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_monotonic_time_clock_gettime(void); +#endif +#if defined(DUK_USE_GET_MONOTONIC_TIME_WINDOWS_QPC) +DUK_INTERNAL_DECL duk_double_t duk_bi_date_get_monotonic_time_windows_qpc(void); +#endif + +DUK_INTERNAL_DECL +void duk_bi_json_parse_helper(duk_hthread *thr, + duk_idx_t idx_value, + duk_idx_t idx_reviver, + duk_small_uint_t flags); +DUK_INTERNAL_DECL +void duk_bi_json_stringify_helper(duk_hthread *thr, + duk_idx_t idx_value, + duk_idx_t idx_replacer, + duk_idx_t idx_space, + duk_small_uint_t flags); + +DUK_INTERNAL_DECL duk_ret_t duk_textdecoder_decode_utf8_nodejs(duk_hthread *thr); + +#if defined(DUK_USE_ES6_PROXY) +DUK_INTERNAL_DECL void duk_proxy_ownkeys_postprocess(duk_hthread *thr, duk_hobject *h_proxy_target, duk_uint_t flags); +#endif + +#endif /* DUK_BUILTIN_PROTOS_H_INCLUDED */ +/* #include duk_selftest.h */ +#line 1 "duk_selftest.h" +/* + * Selftest code + */ + +#if !defined(DUK_SELFTEST_H_INCLUDED) +#define DUK_SELFTEST_H_INCLUDED + +#if defined(DUK_USE_SELF_TESTS) +DUK_INTERNAL_DECL duk_uint_t duk_selftest_run_tests(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *udata); +#endif + +#endif /* DUK_SELFTEST_H_INCLUDED */ +#line 82 "duk_internal.h" + +#endif /* DUK_INTERNAL_H_INCLUDED */ +#line 10 "duk_replacements.c" + +#if defined(DUK_USE_COMPUTED_NAN) +DUK_INTERNAL double duk_computed_nan; +#endif + +#if defined(DUK_USE_COMPUTED_INFINITY) +DUK_INTERNAL double duk_computed_infinity; +#endif + +#if defined(DUK_USE_REPL_FPCLASSIFY) +DUK_INTERNAL int duk_repl_fpclassify(double x) { + duk_double_union u; + duk_uint_fast16_t expt; + duk_small_int_t mzero; + + u.d = x; + expt = (duk_uint_fast16_t) (u.us[DUK_DBL_IDX_US0] & 0x7ff0UL); + if (expt > 0x0000UL && expt < 0x7ff0UL) { + /* expt values [0x001,0x7fe] = normal */ + return DUK_FP_NORMAL; + } + + mzero = (u.ui[DUK_DBL_IDX_UI1] == 0 && (u.ui[DUK_DBL_IDX_UI0] & 0x000fffffUL) == 0); + if (expt == 0x0000UL) { + /* expt 0x000 is zero/subnormal */ + if (mzero) { + return DUK_FP_ZERO; + } else { + return DUK_FP_SUBNORMAL; + } + } else { + /* expt 0xfff is infinite/nan */ + if (mzero) { + return DUK_FP_INFINITE; + } else { + return DUK_FP_NAN; + } + } +} +#endif + +#if defined(DUK_USE_REPL_SIGNBIT) +DUK_INTERNAL int duk_repl_signbit(double x) { + duk_double_union u; + u.d = x; + return (int) (u.uc[DUK_DBL_IDX_UC0] & 0x80UL); +} +#endif + +#if defined(DUK_USE_REPL_ISFINITE) +DUK_INTERNAL int duk_repl_isfinite(double x) { + int c = DUK_FPCLASSIFY(x); + if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) { + return 0; + } else { + return 1; + } +} +#endif + +#if defined(DUK_USE_REPL_ISNAN) +DUK_INTERNAL int duk_repl_isnan(double x) { + int c = DUK_FPCLASSIFY(x); + return (c == DUK_FP_NAN); +} +#endif + +#if defined(DUK_USE_REPL_ISINF) +DUK_INTERNAL int duk_repl_isinf(double x) { + int c = DUK_FPCLASSIFY(x); + return (c == DUK_FP_INFINITE); +} +#endif +#line 1 "duk_debug_macros.c" +/* + * Debugging macro calls. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_DEBUG) + +/* + * Debugging enabled + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> + +#if !defined(DUK_USE_DEBUG_WRITE) +#error debugging enabled (DUK_USE_DEBUG) but DUK_USE_DEBUG_WRITE not defined +#endif + +#define DUK__DEBUG_BUFSIZE DUK_USE_DEBUG_BUFSIZE + +#if defined(DUK_USE_VARIADIC_MACROS) + +DUK_INTERNAL void duk_debug_log(duk_int_t level, const char *file, duk_int_t line, const char *func, const char *fmt, ...) { + va_list ap; + long arg_level; + const char *arg_file; + long arg_line; + const char *arg_func; + const char *arg_msg; + char buf[DUK__DEBUG_BUFSIZE]; + + va_start(ap, fmt); + + duk_memzero((void *) buf, (size_t) DUK__DEBUG_BUFSIZE); + duk_debug_vsnprintf(buf, DUK__DEBUG_BUFSIZE - 1, fmt, ap); + + arg_level = (long) level; + arg_file = (const char *) file; + arg_line = (long) line; + arg_func = (const char *) func; + arg_msg = (const char *) buf; + DUK_USE_DEBUG_WRITE(arg_level, arg_file, arg_line, arg_func, arg_msg); + + va_end(ap); +} + +#else /* DUK_USE_VARIADIC_MACROS */ + +DUK_INTERNAL char duk_debug_file_stash[DUK_DEBUG_STASH_SIZE]; +DUK_INTERNAL duk_int_t duk_debug_line_stash; +DUK_INTERNAL char duk_debug_func_stash[DUK_DEBUG_STASH_SIZE]; +DUK_INTERNAL duk_int_t duk_debug_level_stash; + +DUK_INTERNAL void duk_debug_log(const char *fmt, ...) { + va_list ap; + long arg_level; + const char *arg_file; + long arg_line; + const char *arg_func; + const char *arg_msg; + char buf[DUK__DEBUG_BUFSIZE]; + + va_start(ap, fmt); + + duk_memzero((void *) buf, (size_t) DUK__DEBUG_BUFSIZE); + duk_debug_vsnprintf(buf, DUK__DEBUG_BUFSIZE - 1, fmt, ap); + + arg_level = (long) duk_debug_level_stash; + arg_file = (const char *) duk_debug_file_stash; + arg_line = (long) duk_debug_line_stash; + arg_func = (const char *) duk_debug_func_stash; + arg_msg = (const char *) buf; + DUK_USE_DEBUG_WRITE(arg_level, arg_file, arg_line, arg_func, arg_msg); + + va_end(ap); +} + +#endif /* DUK_USE_VARIADIC_MACROS */ + +#else /* DUK_USE_DEBUG */ + +/* + * Debugging disabled + */ + +#endif /* DUK_USE_DEBUG */ + +/* automatic undefs */ +#undef DUK__DEBUG_BUFSIZE +#line 1 "duk_builtins.c" +/* + * Automatically generated by genbuiltins.py, do not edit! + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_ASSERTIONS) +#define DUK__REFCINIT(refc) 0 /*h_assert_refcount*/, (refc) /*actual*/ +#else +#define DUK__REFCINIT(refc) (refc) /*actual*/ +#endif + +#if defined(DUK_USE_ROM_STRINGS) +#error ROM support not enabled, rerun configure.py with --rom-support +#else /* DUK_USE_ROM_STRINGS */ +DUK_INTERNAL const duk_uint8_t duk_strings_data[967] = { +79,40,209,144,168,105,6,78,54,139,89,185,44,48,46,90,120,8,154,140,35,103, +35,113,193,73,5,52,112,180,104,166,135,52,188,4,98,12,27,146,156,80,211,31, +129,115,150,64,52,220,109,24,18,68,156,24,38,67,114,36,55,9,119,151,132, +140,93,18,113,128,153,201,212,201,205,2,248,8,196,24,224,104,82,146,40,224, +193,48,114,168,37,147,196,54,123,28,4,98,12,43,148,67,103,177,192,70,32, +196,121,68,54,123,28,18,192,199,144,124,4,98,12,43,136,108,244,117,184,8, +196,24,95,40,134,207,71,91,128,140,65,133,113,13,158,158,151,1,24,131,11, +229,16,217,233,233,112,17,136,48,206,21,110,4,244,244,184,8,196,24,103,10, +183,2,122,218,156,4,98,12,24,203,112,64,179,113,193,79,8,218,155,131,32, +184,70,212,220,13,10,82,68,252,123,144,217,146,38,228,207,18,0,100,37,64, +178,212,11,161,17,104,162,96,10,200,193,57,165,65,169,16,5,100,81,27,70,18, +32,10,200,68,185,13,116,221,197,184,64,89,57,41,197,13,49,234,5,208,156, +113,87,55,118,147,20,187,56,161,166,92,221,212,73,210,236,226,134,153,115, +119,76,201,203,179,138,26,99,73,212,136,136,164,25,174,137,56,32,72,137, +101,23,52,45,13,34,86,9,79,136,104,201,114,149,96,52,138,134,140,151,75, +226,233,186,120,121,22,39,54,83,141,5,55,68,236,36,164,3,16,225,115,150,64, +52,205,163,2,72,154,83,138,26,99,75,12,11,150,103,5,36,20,211,70,140,133, +67,72,49,241,160,227,81,196,52,168,106,39,132,252,183,136,105,80,212,79,2, +249,110,128,126,88,95,133,109,237,237,237,151,235,127,46,249,119,203,190, +186,206,33,181,2,208,61,190,12,19,34,65,19,81,132,108,228,97,1,107,33,12, +32,45,100,137,64,247,175,9,19,155,41,198,130,155,134,69,146,100,227,226, +231,146,51,192,204,73,140,224,145,221,102,241,68,196,169,248,30,75,12,11, +151,242,233,187,143,138,24,137,162,164,255,253,63,3,201,97,129,114,254,92, +112,75,136,108,166,6,136,159,255,167,224,121,44,48,46,95,203,166,238,74, +113,67,77,201,128,223,255,223,224,121,44,48,46,95,203,145,46,9,205,16,39, +201,62,36,0,192,21,147,255,238,145,39,199,197,211,116,240,242,113,197,78, +214,211,226,233,187,107,105,19,119,37,56,161,166,52,221,212,201,205,36,240, +242,16,96,152,12,178,52,211,56,228,73,150,83,0,148,39,137,75,67,73,198,209, +129,36,85,185,201,196,2,32,193,48,17,160,97,16,84,44,156,104,24,67,189,200, +108,201,19,238,114,96,137,137,50,238,113,164,188,211,185,192,226,100,19, +134,68,110,112,174,139,0,185,31,115,149,4,88,7,159,115,146,117,34,34,35, +115,143,22,146,208,210,19,115,140,3,207,185,202,130,36,109,85,185,194,161, +160,90,50,72,155,115,149,2,232,67,137,204,122,22,66,161,175,164,210,72,199, +130,137,1,50,32,145,143,38,120,186,195,35,106,51,146,230,8,36,77,109,65,38, +226,72,159,191,189,181,70,140,133,222,249,212,227,66,125,245,187,251,219, +77,3,119,190,117,56,208,159,125,110,254,246,210,26,93,239,157,78,52,39,223, +93,191,189,180,212,52,187,223,58,156,104,79,190,187,127,123,104,180,104, +183,190,117,56,208,159,125,102,254,209,104,209,124,234,113,161,62,250,80, +196,128,81,4,9,16,162,4,196,116,9,205,154,27,66,32,100,13,12,98,68,227,33, +65,69,204,195,34,201,50,8,110,33,23,34,28,168,104,22,188,12,174,138,11,70, +138,104,115,68,130,137,13,82,27,41,129,162,35,138,54,146,198,137,39,72,180, +210,178,38,35,146,103,68,139,51,197,214,28,227,131,79,15,35,138,58,130,37, +19,155,41,146,174,64,203,99,161,100,37,145,51,148,75,4,164,66,54,140,49,46, +247,70,103,37,230,70,142,70,67,30,232,204,178,163,201,18,54,139,89,39,26, +16,165,2,228,69,33,143,89,24,70,206,73,67,102,72,148,2,32,214,73,157,224, +18,128,98,29,241,69,65,50,37,241,116,200,41,144,102,125,2,180,8,210,152,38, +129,23,8,34,198, +}; +#endif /* DUK_USE_ROM_STRINGS */ + +#if defined(DUK_USE_ROM_OBJECTS) +#error ROM support not enabled, rerun configure.py with --rom-support +#else /* DUK_USE_ROM_OBJECTS */ +/* native functions: 177 */ +DUK_INTERNAL const duk_c_function duk_bi_native_functions[177] = { + NULL, + duk_bi_array_constructor, + duk_bi_array_constructor_is_array, + duk_bi_array_prototype_concat, + duk_bi_array_prototype_indexof_shared, + duk_bi_array_prototype_iter_shared, + duk_bi_array_prototype_join_shared, + duk_bi_array_prototype_pop, + duk_bi_array_prototype_push, + duk_bi_array_prototype_reduce_shared, + duk_bi_array_prototype_reverse, + duk_bi_array_prototype_shift, + duk_bi_array_prototype_slice, + duk_bi_array_prototype_sort, + duk_bi_array_prototype_splice, + duk_bi_array_prototype_to_string, + duk_bi_array_prototype_unshift, + duk_bi_arraybuffer_constructor, + duk_bi_arraybuffer_isview, + duk_bi_boolean_constructor, + duk_bi_boolean_prototype_tostring_shared, + duk_bi_buffer_compare_shared, + duk_bi_buffer_readfield, + duk_bi_buffer_slice_shared, + duk_bi_buffer_writefield, + duk_bi_dataview_constructor, + duk_bi_date_constructor, + duk_bi_date_constructor_now, + duk_bi_date_constructor_parse, + duk_bi_date_constructor_utc, + duk_bi_date_prototype_get_shared, + duk_bi_date_prototype_get_timezone_offset, + duk_bi_date_prototype_set_shared, + duk_bi_date_prototype_set_time, + duk_bi_date_prototype_to_json, + duk_bi_date_prototype_tostring_shared, + duk_bi_date_prototype_value_of, + duk_bi_duktape_object_act, + duk_bi_duktape_object_compact, + duk_bi_duktape_object_dec, + duk_bi_duktape_object_enc, + duk_bi_duktape_object_fin, + duk_bi_duktape_object_gc, + duk_bi_duktape_object_info, + duk_bi_error_constructor_shared, + duk_bi_error_prototype_filename_getter, + duk_bi_error_prototype_filename_setter, + duk_bi_error_prototype_linenumber_getter, + duk_bi_error_prototype_linenumber_setter, + duk_bi_error_prototype_stack_getter, + duk_bi_error_prototype_stack_setter, + duk_bi_error_prototype_to_string, + duk_bi_function_constructor, + duk_bi_function_prototype, + duk_bi_function_prototype_apply, + duk_bi_function_prototype_bind, + duk_bi_function_prototype_call, + duk_bi_function_prototype_to_string, + duk_bi_global_object_decode_uri, + duk_bi_global_object_decode_uri_component, + duk_bi_global_object_encode_uri, + duk_bi_global_object_encode_uri_component, + duk_bi_global_object_escape, + duk_bi_global_object_eval, + duk_bi_global_object_is_finite, + duk_bi_global_object_is_nan, + duk_bi_global_object_parse_float, + duk_bi_global_object_parse_int, + duk_bi_global_object_unescape, + duk_bi_json_object_parse, + duk_bi_json_object_stringify, + duk_bi_math_object_clz32, + duk_bi_math_object_hypot, + duk_bi_math_object_imul, + duk_bi_math_object_max, + duk_bi_math_object_min, + duk_bi_math_object_onearg_shared, + duk_bi_math_object_random, + duk_bi_math_object_sign, + duk_bi_math_object_twoarg_shared, + duk_bi_native_function_length, + duk_bi_native_function_name, + duk_bi_nodejs_buffer_byte_length, + duk_bi_nodejs_buffer_concat, + duk_bi_nodejs_buffer_constructor, + duk_bi_nodejs_buffer_copy, + duk_bi_nodejs_buffer_fill, + duk_bi_nodejs_buffer_is_buffer, + duk_bi_nodejs_buffer_is_encoding, + duk_bi_nodejs_buffer_tojson, + duk_bi_nodejs_buffer_tostring, + duk_bi_nodejs_buffer_write, + duk_bi_number_check_shared, + duk_bi_number_constructor, + duk_bi_number_prototype_to_exponential, + duk_bi_number_prototype_to_fixed, + duk_bi_number_prototype_to_locale_string, + duk_bi_number_prototype_to_precision, + duk_bi_number_prototype_to_string, + duk_bi_number_prototype_value_of, + duk_bi_object_constructor, + duk_bi_object_constructor_assign, + duk_bi_object_constructor_create, + duk_bi_object_constructor_define_properties, + duk_bi_object_constructor_define_property, + duk_bi_object_constructor_get_own_property_descriptor, + duk_bi_object_constructor_is, + duk_bi_object_constructor_is_extensible, + duk_bi_object_constructor_is_sealed_frozen_shared, + duk_bi_object_constructor_keys_shared, + duk_bi_object_constructor_prevent_extensions, + duk_bi_object_constructor_seal_freeze_shared, + duk_bi_object_getprototype_shared, + duk_bi_object_prototype_defineaccessor, + duk_bi_object_prototype_has_own_property, + duk_bi_object_prototype_is_prototype_of, + duk_bi_object_prototype_lookupaccessor, + duk_bi_object_prototype_property_is_enumerable, + duk_bi_object_prototype_to_locale_string, + duk_bi_object_prototype_to_string, + duk_bi_object_prototype_value_of, + duk_bi_object_setprototype_shared, + duk_bi_performance_now, + duk_bi_pointer_constructor, + duk_bi_pointer_prototype_tostring_shared, + duk_bi_proxy_constructor, + duk_bi_reflect_apply, + duk_bi_reflect_construct, + duk_bi_reflect_object_delete_property, + duk_bi_reflect_object_get, + duk_bi_reflect_object_has, + duk_bi_reflect_object_set, + duk_bi_regexp_constructor, + duk_bi_regexp_prototype_exec, + duk_bi_regexp_prototype_flags, + duk_bi_regexp_prototype_shared_getter, + duk_bi_regexp_prototype_test, + duk_bi_regexp_prototype_tostring, + duk_bi_string_constructor, + duk_bi_string_constructor_from_char_code, + duk_bi_string_constructor_from_code_point, + duk_bi_string_prototype_caseconv_shared, + duk_bi_string_prototype_char_at, + duk_bi_string_prototype_char_code_at, + duk_bi_string_prototype_concat, + duk_bi_string_prototype_includes, + duk_bi_string_prototype_indexof_shared, + duk_bi_string_prototype_locale_compare, + duk_bi_string_prototype_match, + duk_bi_string_prototype_repeat, + duk_bi_string_prototype_replace, + duk_bi_string_prototype_search, + duk_bi_string_prototype_slice, + duk_bi_string_prototype_split, + duk_bi_string_prototype_startswith_endswith, + duk_bi_string_prototype_substr, + duk_bi_string_prototype_substring, + duk_bi_string_prototype_to_string, + duk_bi_string_prototype_trim, + duk_bi_textdecoder_constructor, + duk_bi_textdecoder_prototype_decode, + duk_bi_textdecoder_prototype_shared_getter, + duk_bi_textencoder_constructor, + duk_bi_textencoder_prototype_encode, + duk_bi_textencoder_prototype_encoding_getter, + duk_bi_thread_constructor, + duk_bi_thread_current, + duk_bi_thread_resume, + duk_bi_thread_yield, + duk_bi_type_error_thrower, + duk_bi_typedarray_buffer_getter, + duk_bi_typedarray_bytelength_getter, + duk_bi_typedarray_byteoffset_getter, + duk_bi_typedarray_constructor, + duk_bi_typedarray_set, + duk_bi_uint8array_allocplain, + duk_bi_uint8array_plainof, +}; +#if defined(DUK_USE_DOUBLE_LE) +DUK_INTERNAL const duk_uint8_t duk_builtins_data[4116] = { +144,148,105,224,32,68,52,228,62,12,104,200,165,132,52,167,194,138,105,243, +124,57,28,211,57,18,64,52,238,126,44,138,111,171,241,164,19,87,129,30,33, +167,16,145,159,8,211,136,9,225,42,5,240,145,139,163,163,8,211,136,10,228, +64,211,19,132,140,93,29,56,70,156,64,119,34,66,146,36,104,137,194,70,46, +142,172,35,78,32,47,146,195,102,11,240,145,139,163,175,8,211,136,9,228,240, +242,112,145,139,163,179,8,211,136,8,237,34,130,118,49,116,118,225,26,48,0, +1,82,29,201,158,46,183,39,135,147,132,140,93,16,132,76,66,33,8,66,16,132, +33,8,66,26,179,233,97,167,60,150,34,33,154,112,0,1,75,247,35,79,95,237,198, +174,200,47,31,23,95,17,13,51,19,35,93,68,216,209,128,0,10,208,174,79,15,32, +248,8,196,24,8,107,192,0,5,106,118,27,94,0,0,43,83,227,94,0,0,43,84,46,215, +128,0,10,213,28,198,188,0,0,86,169,100,53,224,0,2,181,79,85,175,0,0,21,170, +154,45,120,0,0,173,85,217,107,192,0,5,106,182,243,86,193,106,52,127,130, +249,50,94,124,35,68,225,146,49,13,31,186,23,201,146,243,224,200,39,12,145, +136,67,134,19,49,0,0,0,0,0,0,3,225,255,51,0,0,0,0,0,0,3,193,255,47,18,1, +172,19,120,71,10,25,196,136,113,162,156,136,199,42,57,204,144,115,132,240, +149,2,248,72,197,209,58,2,185,16,52,196,225,35,23,68,233,14,228,72,82,68, +141,17,56,72,197,209,58,130,249,44,54,96,191,9,24,186,39,88,79,39,135,147, +132,140,93,19,176,35,180,138,9,216,197,209,59,82,79,35,40,242,65,248,58,42, +96,121,14,232,94,62,46,190,15,42,31,145,33,86,65,76,242,214,143,73,48,242, +243,79,49,56,243,115,207,57,64,243,180,79,61,72,243,244,207,65,80,244,53, +79,69,88,244,98,30,8,200,156,67,102,120,241,79,4,100,78,21,110,4,207,32,47, +147,37,231,194,52,78,25,34,122,81,124,153,47,62,12,130,112,201,19,211,139, +121,34,87,69,128,104,137,239,83,18,238,108,165,2,162,92,104,56,220,233,1,8, +151,10,134,162,100,206,16,18,50,9,195,39,105,20,101,136,18,25,4,225,147, +180,138,5,215,49,238,105,27,60,185,1,36,104,156,50,118,145,70,96,129,34,52, +78,25,59,72,160,93,115,30,230,145,179,204,144,12,73,8,15,38,104,128,138,52, +146,16,30,77,1,0,2,11,132,193,198,36,248,248,186,110,158,30,78,56,188,194, +70,183,170,136,48,98,79,142,179,120,248,185,228,140,241,193,146,66,138,31, +55,71,138,128,153,137,62,58,205,227,226,231,146,51,199,26,6,18,92,146,64, +96,74,72,51,120,43,192,97,68,128,153,56,72,7,12,133,67,73,199,197,207,36, +103,142,35,2,3,33,80,210,113,241,115,201,25,160,146,225,160,9,34,1,124,178, +1,139,18,19,36,229,146,8,190,36,169,27,62,18,243,35,100,135,54,92,162,2,17, +46,72,128,89,7,200,32,33,18,225,98,236,145,188,130,64,196,75,132,188,200, +217,32,43,39,28,128,69,19,18,228,144,42,98,79,142,179,120,248,185,228,140, +241,201,97,129,114,229,201,37,2,68,184,200,1,147,93,159,153,213,34,235,250, +96,48,157,32,24,94,160,1,199,4,184,235,55,143,139,158,72,207,28,226,3,81, +46,62,46,155,167,135,147,142,47,60,129,71,197,207,36,103,142,34,92,35,104, +194,68,1,89,58,36,8,109,109,12,133,67,73,195,18,115,36,118,182,185,168,8, +109,109,12,133,67,73,201,18,115,36,118,182,185,168,130,27,91,75,115,149,71, +240,196,156,201,29,173,174,129,2,27,91,75,115,149,71,242,68,156,201,29,173, 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+128,65,17,11,212,19,130,137,121,211,210,209,144,6,39,75,80,80,0,201,119, +234,10,8,41,86,231,71,80,80,129,79,135,186,122,69,224,34,25,69,233,80,3,91, +141,168,40,96,139,113,180,181,5,36,21,110,54,142,134,160,165,1,176,23,211, +47,0,216,134,233,215,128,111,117,181,104,128,209,3,70,230,106,64,5,139,168, +209,234,10,32,36,144,102,234,136,3,146,27,168,40,160,146,132,103,168,40, +192,115,3,117,5,28,22,113,163,69,168,41,103,1,66,188,17,145,52,40,4,202, +113,67,76,130,227,68,194,13,240,108,0,0,83,96,0,2,161,0,104,146,84,97,48,0, +1,78,192,56,169,24,145,179,192,0,5,48,8,56,16,32,128,56,18,52,125,166,86, +147,182,140,28,50,21,13,39,31,23,60,145,158,56,140,141,47,113,6,155,186, +188,24,49,39,199,89,188,124,92,242,70,120,224,201,33,69,15,155,163,197,68, +14,49,39,199,197,211,116,240,242,113,197,230,18,180,253,228,3,17,46,18,243, +35,100,128,172,156,114,70,163,146,76,34,248,146,164,108,248,75,204,141,146, +28,217,114,137,27,78,251,241,173,234,162,160,225,1,3,34,92,170,9,105,164, +32,225,64,131,155,1,193,133,7,19,39,22,70,154,103,143,128,0,10,176,20,28, +76,156,113,75,34,78,62,0,0,43,0,48,104,82,146,49,240,0,1,84,11,180,192,0,5, +114,1,18,160,65,24,131,20,145,25,172,48,132,122,28,76,146,218,121,35,180, +69,145,132,108,224,0,0,120,31,128,0,0,0,25,172,56,132,122,28,76,146,218, +121,35,180,69,145,132,108,224,0,0,120,31,128,0,0,0,40,160,45,110,23,30,176, +33,184,0,0,175,32,29,235,2,27,199,23,0,0,22,4,51,88,129,8,244,56,153,37, +180,242,71,104,139,35,8,217,192,0,0,240,63,0,0,0,0,51,88,145,8,244,56,153, +37,180,242,71,104,139,35,8,217,192,0,0,0,64,0,0,0,0,51,88,161,8,244,56,153, +37,180,242,71,104,139,35,8,217,192,0,0,0,64,0,0,0,0,51,88,177,8,244,56,153, +37,180,242,71,104,139,35,8,217,192,0,0,16,64,0,0,0,0,51,88,193,8,244,56, +153,37,180,242,71,104,139,35,8,217,192,0,0,16,64,0,0,0,0,51,88,209,8,244, +56,153,37,180,242,71,104,139,35,8,217,192,0,0,16,64,0,0,0,0,51,88,225,8, +244,56,153,37,180,242,71,104,139,35,8,217,192,0,0,32,64,0,0,0,0,32,227,194, +0,97,57,162,4,245,232,5,34,92,35,68,225,161,166,218,16,16,137,112,52,41,73, +29,153,1,65,196,201,197,145,166,153,245,200,3,137,204,120,34,74,8,200,58, +112,28,211,32,130,52,78,26,26,110,248,0,0,164,4,12,70,137,195,39,252,73, +240,117,32,57,168,97,4,104,156,52,52,221,255,160,20,160,152,23,223,250,32, +148,25,174,137,58,23,51,191,244,84,12,50,9,195,39,240,81,238,2,3,107,173, +214,3,192, +}; +#else +#error invalid endianness defines +#endif +#endif /* DUK_USE_ROM_OBJECTS */ + +/* automatic undefs */ +#undef DUK__REFCINIT +#line 1 "duk_error_macros.c" +/* + * Error and fatal handling. + */ + +/* #include duk_internal.h -> already included */ + +#define DUK__ERRFMT_BUFSIZE 256 /* size for formatting buffers */ + +#if defined(DUK_USE_VERBOSE_ERRORS) + +DUK_INTERNAL DUK_COLD void duk_err_handle_error_fmt(duk_hthread *thr, const char *filename, duk_uint_t line_and_code, const char *fmt, ...) { + va_list ap; + char msg[DUK__ERRFMT_BUFSIZE]; + va_start(ap, fmt); + (void) DUK_VSNPRINTF(msg, sizeof(msg), fmt, ap); + msg[sizeof(msg) - 1] = (char) 0; + duk_err_create_and_throw(thr, (duk_errcode_t) (line_and_code >> 24), msg, filename, (duk_int_t) (line_and_code & 0x00ffffffL)); + va_end(ap); /* dead code, but ensures portability (see Linux man page notes) */ +} + +DUK_INTERNAL DUK_COLD void duk_err_handle_error(duk_hthread *thr, const char *filename, duk_uint_t line_and_code, const char *msg) { + duk_err_create_and_throw(thr, (duk_errcode_t) (line_and_code >> 24), msg, filename, (duk_int_t) (line_and_code & 0x00ffffffL)); +} + +#else /* DUK_USE_VERBOSE_ERRORS */ + +DUK_INTERNAL DUK_COLD void duk_err_handle_error(duk_hthread *thr, duk_errcode_t code) { + duk_err_create_and_throw(thr, code); +} + +#endif /* DUK_USE_VERBOSE_ERRORS */ + +/* + * Error throwing helpers + */ + +#if defined(DUK_USE_VERBOSE_ERRORS) +#if defined(DUK_USE_PARANOID_ERRORS) +DUK_INTERNAL DUK_COLD void duk_err_require_type_index(duk_hthread *thr, const char *filename, duk_int_t linenumber, duk_idx_t idx, const char *expect_name) { + DUK_ERROR_RAW_FMT3(thr, filename, linenumber, DUK_ERR_TYPE_ERROR, "%s required, found %s (stack index %ld)", + expect_name, duk_get_type_name(thr, idx), (long) idx); +} +#else +DUK_INTERNAL DUK_COLD void duk_err_require_type_index(duk_hthread *thr, const char *filename, duk_int_t linenumber, duk_idx_t idx, const char *expect_name) { + DUK_ERROR_RAW_FMT3(thr, filename, linenumber, DUK_ERR_TYPE_ERROR, "%s required, found %s (stack index %ld)", + expect_name, duk_push_string_readable(thr, idx), (long) idx); +} +#endif +DUK_INTERNAL DUK_COLD void duk_err_error_internal(duk_hthread *thr, const char *filename, duk_int_t linenumber) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_ERROR, DUK_STR_INTERNAL_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_error_alloc_failed(duk_hthread *thr, const char *filename, duk_int_t linenumber) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_ERROR, DUK_STR_ALLOC_FAILED); +} +DUK_INTERNAL DUK_COLD void duk_err_error(duk_hthread *thr, const char *filename, duk_int_t linenumber, const char *message) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_ERROR, message); +} +DUK_INTERNAL DUK_COLD void duk_err_range(duk_hthread *thr, const char *filename, duk_int_t linenumber, const char *message) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_RANGE_ERROR, message); +} +DUK_INTERNAL DUK_COLD void duk_err_range_index(duk_hthread *thr, const char *filename, duk_int_t linenumber, duk_idx_t idx) { + DUK_ERROR_RAW_FMT1(thr, filename, linenumber, DUK_ERR_RANGE_ERROR, "invalid stack index %ld", (long) (idx)); +} +DUK_INTERNAL DUK_COLD void duk_err_range_push_beyond(duk_hthread *thr, const char *filename, duk_int_t linenumber) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_RANGE_ERROR, DUK_STR_PUSH_BEYOND_ALLOC_STACK); +} +DUK_INTERNAL DUK_COLD void duk_err_type_invalid_args(duk_hthread *thr, const char *filename, duk_int_t linenumber) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_TYPE_ERROR, DUK_STR_INVALID_ARGS); +} +DUK_INTERNAL DUK_COLD void duk_err_type_invalid_state(duk_hthread *thr, const char *filename, duk_int_t linenumber) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_TYPE_ERROR, DUK_STR_INVALID_STATE); +} +DUK_INTERNAL DUK_COLD void duk_err_type_invalid_trap_result(duk_hthread *thr, const char *filename, duk_int_t linenumber) { + DUK_ERROR_RAW(thr, filename, linenumber, DUK_ERR_TYPE_ERROR, DUK_STR_INVALID_TRAP_RESULT); +} +#else +/* The file/line arguments are NULL and 0, they're ignored by DUK_ERROR_RAW() + * when non-verbose errors are used. + */ + +DUK_NORETURN(DUK_LOCAL_DECL void duk__err_shared(duk_hthread *thr, duk_errcode_t code)); +DUK_LOCAL void duk__err_shared(duk_hthread *thr, duk_errcode_t code) { + DUK_ERROR_RAW(thr, NULL, 0, code, NULL); +} +DUK_INTERNAL DUK_COLD void duk_err_error(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_range(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_RANGE_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_eval(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_EVAL_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_reference(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_REFERENCE_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_syntax(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_SYNTAX_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_type(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_TYPE_ERROR); +} +DUK_INTERNAL DUK_COLD void duk_err_uri(duk_hthread *thr) { + duk__err_shared(thr, DUK_ERR_URI_ERROR); +} +#endif + +/* + * Default fatal error handler + */ + +DUK_INTERNAL DUK_COLD void duk_default_fatal_handler(void *udata, const char *msg) { + DUK_UNREF(udata); + DUK_UNREF(msg); + + msg = msg ? msg : "NULL"; + +#if defined(DUK_USE_FATAL_HANDLER) + /* duk_config.h provided a custom default fatal handler. */ + DUK_D(DUK_DPRINT("custom default fatal error handler called: %s", msg)); + DUK_USE_FATAL_HANDLER(udata, msg); +#elif defined(DUK_USE_CPP_EXCEPTIONS) + /* With C++ use a duk_fatal_exception which user code can catch in + * a natural way. + */ + DUK_D(DUK_DPRINT("built-in default C++ fatal error handler called: %s", msg)); + throw duk_fatal_exception(msg); +#else + /* Default behavior is to abort() on error. There's no printout + * which makes this awkward, so it's always recommended to use an + * explicit fatal error handler. + * + * ==================================================================== + * NOTE: If you are seeing this, you are most likely dealing with an + * uncaught error. You should provide a fatal error handler in Duktape + * heap creation, and should consider using a protected call as your + * first call into an empty Duktape context to properly handle errors. + * See: + * - http://duktape.org/guide.html#error-handling + * - http://wiki.duktape.org/HowtoFatalErrors.html + * - http://duktape.org/api.html#taglist-protected + * ==================================================================== + */ + DUK_D(DUK_DPRINT("built-in default fatal error handler called: %s", msg)); + DUK_ABORT(); +#endif + + DUK_D(DUK_DPRINT("fatal error handler returned, enter forever loop")); + for (;;) { + /* Loop forever to ensure we don't return. */ + } +} + +/* automatic undefs */ +#undef DUK__ERRFMT_BUFSIZE +#line 1 "duk_unicode_support.c" +/* + * Various Unicode help functions for character classification predicates, + * case conversion, decoding, etc. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Fast path tables + */ + +#if defined(DUK_USE_IDCHAR_FASTPATH) +DUK_INTERNAL const duk_int8_t duk_is_idchar_tab[128] = { + /* 0: not IdentifierStart or IdentifierPart + * 1: IdentifierStart and IdentifierPart + * -1: IdentifierPart only + */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00...0x0f */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10...0x1f */ + 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20...0x2f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, /* 0x30...0x3f */ + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40...0x4f */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, /* 0x50...0x5f */ + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60...0x6f */ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 /* 0x70...0x7f */ +}; +#endif + +/* + * XUTF-8 and CESU-8 encoding/decoding + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_get_xutf8_length(duk_ucodepoint_t cp) { + duk_uint_fast32_t x = (duk_uint_fast32_t) cp; + if (x < 0x80UL) { + /* 7 bits */ + return 1; + } else if (x < 0x800UL) { + /* 11 bits */ + return 2; + } else if (x < 0x10000UL) { + /* 16 bits */ + return 3; + } else if (x < 0x200000UL) { + /* 21 bits */ + return 4; + } else if (x < 0x4000000UL) { + /* 26 bits */ + return 5; + } else if (x < (duk_ucodepoint_t) 0x80000000UL) { + /* 31 bits */ + return 6; + } else { + /* 36 bits */ + return 7; + } +} + +#if defined(DUK_USE_ASSERTIONS) +DUK_INTERNAL duk_small_int_t duk_unicode_get_cesu8_length(duk_ucodepoint_t cp) { + duk_uint_fast32_t x = (duk_uint_fast32_t) cp; + if (x < 0x80UL) { + /* 7 bits */ + return 1; + } else if (x < 0x800UL) { + /* 11 bits */ + return 2; + } else if (x < 0x10000UL) { + /* 16 bits */ + return 3; + } else { + /* Encoded as surrogate pair, each encoding to 3 bytes for + * 6 bytes total. Codepoints above U+10FFFF encode as 6 bytes + * too, see duk_unicode_encode_cesu8(). + */ + return 3 + 3; + } +} +#endif /* DUK_USE_ASSERTIONS */ + +DUK_INTERNAL const duk_uint8_t duk_unicode_xutf8_markers[7] = { + 0x00, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe +}; + +/* Encode to extended UTF-8; 'out' must have space for at least + * DUK_UNICODE_MAX_XUTF8_LENGTH bytes. Allows encoding of any + * 32-bit (unsigned) codepoint. + */ +DUK_INTERNAL duk_small_int_t duk_unicode_encode_xutf8(duk_ucodepoint_t cp, duk_uint8_t *out) { + duk_uint_fast32_t x = (duk_uint_fast32_t) cp; + duk_small_int_t len; + duk_uint8_t marker; + duk_small_int_t i; + + len = duk_unicode_get_xutf8_length(cp); + DUK_ASSERT(len > 0); + + marker = duk_unicode_xutf8_markers[len - 1]; /* 64-bit OK because always >= 0 */ + + i = len; + DUK_ASSERT(i > 0); + do { + i--; + if (i > 0) { + out[i] = (duk_uint8_t) (0x80 + (x & 0x3f)); + x >>= 6; + } else { + /* Note: masking of 'x' is not necessary because of + * range check and shifting -> no bits overlapping + * the marker should be set. + */ + out[0] = (duk_uint8_t) (marker + x); + } + } while (i > 0); + + return len; +} + +/* Encode to CESU-8; 'out' must have space for at least + * DUK_UNICODE_MAX_CESU8_LENGTH bytes; codepoints above U+10FFFF + * will encode to garbage but won't overwrite the output buffer. + */ +DUK_INTERNAL duk_small_int_t duk_unicode_encode_cesu8(duk_ucodepoint_t cp, duk_uint8_t *out) { + duk_uint_fast32_t x = (duk_uint_fast32_t) cp; + duk_small_int_t len; + + if (x < 0x80UL) { + out[0] = (duk_uint8_t) x; + len = 1; + } else if (x < 0x800UL) { + out[0] = (duk_uint8_t) (0xc0 + ((x >> 6) & 0x1f)); + out[1] = (duk_uint8_t) (0x80 + (x & 0x3f)); + len = 2; + } else if (x < 0x10000UL) { + /* surrogate pairs get encoded here */ + out[0] = (duk_uint8_t) (0xe0 + ((x >> 12) & 0x0f)); + out[1] = (duk_uint8_t) (0x80 + ((x >> 6) & 0x3f)); + out[2] = (duk_uint8_t) (0x80 + (x & 0x3f)); + len = 3; + } else { + /* + * Unicode codepoints above U+FFFF are encoded as surrogate + * pairs here. This ensures that all CESU-8 codepoints are + * 16-bit values as expected in ECMAScript. The surrogate + * pairs always get a 3-byte encoding (each) in CESU-8. + * See: http://en.wikipedia.org/wiki/Surrogate_pair + * + * 20-bit codepoint, 10 bits (A and B) per surrogate pair: + * + * x = 0b00000000 0000AAAA AAAAAABB BBBBBBBB + * sp1 = 0b110110AA AAAAAAAA (0xd800 + ((x >> 10) & 0x3ff)) + * sp2 = 0b110111BB BBBBBBBB (0xdc00 + (x & 0x3ff)) + * + * Encoded into CESU-8: + * + * sp1 -> 0b11101101 (0xe0 + ((sp1 >> 12) & 0x0f)) + * -> 0b1010AAAA (0x80 + ((sp1 >> 6) & 0x3f)) + * -> 0b10AAAAAA (0x80 + (sp1 & 0x3f)) + * sp2 -> 0b11101101 (0xe0 + ((sp2 >> 12) & 0x0f)) + * -> 0b1011BBBB (0x80 + ((sp2 >> 6) & 0x3f)) + * -> 0b10BBBBBB (0x80 + (sp2 & 0x3f)) + * + * Note that 0x10000 must be subtracted first. The code below + * avoids the sp1, sp2 temporaries which saves around 20 bytes + * of code. + */ + + x -= 0x10000UL; + + out[0] = (duk_uint8_t) (0xed); + out[1] = (duk_uint8_t) (0xa0 + ((x >> 16) & 0x0f)); + out[2] = (duk_uint8_t) (0x80 + ((x >> 10) & 0x3f)); + out[3] = (duk_uint8_t) (0xed); + out[4] = (duk_uint8_t) (0xb0 + ((x >> 6) & 0x0f)); + out[5] = (duk_uint8_t) (0x80 + (x & 0x3f)); + len = 6; + } + + return len; +} + +/* Decode helper. Return zero on error. */ +DUK_INTERNAL duk_small_int_t duk_unicode_decode_xutf8(duk_hthread *thr, const duk_uint8_t **ptr, const duk_uint8_t *ptr_start, const duk_uint8_t *ptr_end, duk_ucodepoint_t *out_cp) { + const duk_uint8_t *p; + duk_uint32_t res; + duk_uint_fast8_t ch; + duk_small_int_t n; + + DUK_UNREF(thr); + + p = *ptr; + if (p < ptr_start || p >= ptr_end) { + goto fail; + } + + /* + * UTF-8 decoder which accepts longer than standard byte sequences. + * This allows full 32-bit code points to be used. + */ + + ch = (duk_uint_fast8_t) (*p++); + if (ch < 0x80) { + /* 0xxx xxxx [7 bits] */ + res = (duk_uint32_t) (ch & 0x7f); + n = 0; + } else if (ch < 0xc0) { + /* 10xx xxxx -> invalid */ + goto fail; + } else if (ch < 0xe0) { + /* 110x xxxx 10xx xxxx [11 bits] */ + res = (duk_uint32_t) (ch & 0x1f); + n = 1; + } else if (ch < 0xf0) { + /* 1110 xxxx 10xx xxxx 10xx xxxx [16 bits] */ + res = (duk_uint32_t) (ch & 0x0f); + n = 2; + } else if (ch < 0xf8) { + /* 1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx [21 bits] */ + res = (duk_uint32_t) (ch & 0x07); + n = 3; + } else if (ch < 0xfc) { + /* 1111 10xx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx [26 bits] */ + res = (duk_uint32_t) (ch & 0x03); + n = 4; + } else if (ch < 0xfe) { + /* 1111 110x 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx [31 bits] */ + res = (duk_uint32_t) (ch & 0x01); + n = 5; + } else if (ch < 0xff) { + /* 1111 1110 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx [36 bits] */ + res = (duk_uint32_t) (0); + n = 6; + } else { + /* 8-byte format could be: + * 1111 1111 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx [41 bits] + * + * However, this format would not have a zero bit following the + * leading one bits and would not allow 0xFF to be used as an + * "invalid xutf-8" marker for internal keys. Further, 8-byte + * encodings (up to 41 bit code points) are not currently needed. + */ + goto fail; + } + + DUK_ASSERT(p >= ptr_start); /* verified at beginning */ + if (p + n > ptr_end) { + /* check pointer at end */ + goto fail; + } + + while (n > 0) { + DUK_ASSERT(p >= ptr_start && p < ptr_end); + ch = (duk_uint_fast8_t) (*p++); +#if 0 + if (ch & 0xc0 != 0x80) { + /* not a continuation byte */ + p--; + *ptr = p; + *out_cp = DUK_UNICODE_CP_REPLACEMENT_CHARACTER; + return 1; + } +#endif + res = (res << 6) + (duk_uint32_t) (ch & 0x3f); + n--; + } + + *ptr = p; + *out_cp = res; + return 1; + + fail: + return 0; +} + +/* used by e.g. duk_regexp_executor.c, string built-ins */ +DUK_INTERNAL duk_ucodepoint_t duk_unicode_decode_xutf8_checked(duk_hthread *thr, const duk_uint8_t **ptr, const duk_uint8_t *ptr_start, const duk_uint8_t *ptr_end) { + duk_ucodepoint_t cp; + + if (duk_unicode_decode_xutf8(thr, ptr, ptr_start, ptr_end, &cp)) { + return cp; + } + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); +} + +/* Compute (extended) utf-8 length without codepoint encoding validation, + * used for string interning. + * + * NOTE: This algorithm is performance critical, more so than string hashing + * in some cases. It is needed when interning a string and needs to scan + * every byte of the string with no skipping. Having an ASCII fast path + * is useful if possible in the algorithm. The current algorithms were + * chosen from several variants, based on x64 gcc -O2 testing. See: + * https://github.com/svaarala/duktape/pull/422 + * + * NOTE: must match tools/dukutil.py:duk_unicode_unvalidated_utf8_length(). + */ + +#if defined(DUK_USE_PREFER_SIZE) +/* Small variant; roughly 150 bytes smaller than the fast variant. */ +DUK_INTERNAL duk_size_t duk_unicode_unvalidated_utf8_length(const duk_uint8_t *data, duk_size_t blen) { + const duk_uint8_t *p; + const duk_uint8_t *p_end; + duk_size_t ncont; + duk_size_t clen; + + p = data; + p_end = data + blen; + ncont = 0; + while (p != p_end) { + duk_uint8_t x; + x = *p++; + if (DUK_UNLIKELY(x >= 0x80 && x <= 0xbf)) { + ncont++; + } + } + + DUK_ASSERT(ncont <= blen); + clen = blen - ncont; + DUK_ASSERT(clen <= blen); + return clen; +} +#else /* DUK_USE_PREFER_SIZE */ +/* This seems like a good overall approach. Fast path for ASCII in 4 byte + * blocks. + */ +DUK_INTERNAL duk_size_t duk_unicode_unvalidated_utf8_length(const duk_uint8_t *data, duk_size_t blen) { + const duk_uint8_t *p; + const duk_uint8_t *p_end; + const duk_uint32_t *p32_end; + const duk_uint32_t *p32; + duk_size_t ncont; + duk_size_t clen; + + ncont = 0; /* number of continuation (non-initial) bytes in [0x80,0xbf] */ + p = data; + p_end = data + blen; + if (blen < 16) { + goto skip_fastpath; + } + + /* Align 'p' to 4; the input data may have arbitrary alignment. + * End of string check not needed because blen >= 16. + */ + while (((duk_size_t) (const void *) p) & 0x03U) { + duk_uint8_t x; + x = *p++; + if (DUK_UNLIKELY(x >= 0x80 && x <= 0xbf)) { + ncont++; + } + } + + /* Full, aligned 4-byte reads. */ + p32_end = (const duk_uint32_t *) (const void *) (p + ((duk_size_t) (p_end - p) & (duk_size_t) (~0x03))); + p32 = (const duk_uint32_t *) (const void *) p; + while (p32 != (const duk_uint32_t *) p32_end) { + duk_uint32_t x; + x = *p32++; + if (DUK_LIKELY((x & 0x80808080UL) == 0)) { + ; /* ASCII fast path */ + } else { + /* Flip highest bit of each byte which changes + * the bit pattern 10xxxxxx into 00xxxxxx which + * allows an easy bit mask test. + */ + x ^= 0x80808080UL; + if (DUK_UNLIKELY(!(x & 0xc0000000UL))) { + ncont++; + } + if (DUK_UNLIKELY(!(x & 0x00c00000UL))) { + ncont++; + } + if (DUK_UNLIKELY(!(x & 0x0000c000UL))) { + ncont++; + } + if (DUK_UNLIKELY(!(x & 0x000000c0UL))) { + ncont++; + } + } + } + p = (const duk_uint8_t *) p32; + /* Fall through to handle the rest. */ + + skip_fastpath: + while (p != p_end) { + duk_uint8_t x; + x = *p++; + if (DUK_UNLIKELY(x >= 0x80 && x <= 0xbf)) { + ncont++; + } + } + + DUK_ASSERT(ncont <= blen); + clen = blen - ncont; + DUK_ASSERT(clen <= blen); + return clen; +} +#endif /* DUK_USE_PREFER_SIZE */ + +/* + * Unicode range matcher + * + * Matches a codepoint against a packed bitstream of character ranges. + * Used for slow path Unicode matching. + */ + +/* Must match tools/extract_chars.py, generate_match_table3(). */ +DUK_LOCAL duk_uint32_t duk__uni_decode_value(duk_bitdecoder_ctx *bd_ctx) { + duk_uint32_t t; + + t = (duk_uint32_t) duk_bd_decode(bd_ctx, 4); + if (t <= 0x0eU) { + return t; + } + t = (duk_uint32_t) duk_bd_decode(bd_ctx, 8); + if (t <= 0xfdU) { + return t + 0x0f; + } + if (t == 0xfeU) { + t = (duk_uint32_t) duk_bd_decode(bd_ctx, 12); + return t + 0x0fU + 0xfeU; + } else { + t = (duk_uint32_t) duk_bd_decode(bd_ctx, 24); + return t + 0x0fU + 0xfeU + 0x1000UL; + } +} + +DUK_LOCAL duk_small_int_t duk__uni_range_match(const duk_uint8_t *unitab, duk_size_t unilen, duk_codepoint_t cp) { + duk_bitdecoder_ctx bd_ctx; + duk_codepoint_t prev_re; + + duk_memzero(&bd_ctx, sizeof(bd_ctx)); + bd_ctx.data = (const duk_uint8_t *) unitab; + bd_ctx.length = (duk_size_t) unilen; + + prev_re = 0; + for (;;) { + duk_codepoint_t r1, r2; + r1 = (duk_codepoint_t) duk__uni_decode_value(&bd_ctx); + if (r1 == 0) { + break; + } + r2 = (duk_codepoint_t) duk__uni_decode_value(&bd_ctx); + + r1 = prev_re + r1; + r2 = r1 + r2; + prev_re = r2; + + /* [r1,r2] is the range */ + + DUK_DDD(DUK_DDDPRINT("duk__uni_range_match: cp=%06lx range=[0x%06lx,0x%06lx]", + (unsigned long) cp, (unsigned long) r1, (unsigned long) r2)); + if (cp >= r1 && cp <= r2) { + return 1; + } + } + + return 0; +} + +/* + * "WhiteSpace" production check. + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_is_whitespace(duk_codepoint_t cp) { + /* + * E5 Section 7.2 specifies six characters specifically as + * white space: + * + * 0009;<control>;Cc;0;S;;;;;N;CHARACTER TABULATION;;;; + * 000B;<control>;Cc;0;S;;;;;N;LINE TABULATION;;;; + * 000C;<control>;Cc;0;WS;;;;;N;FORM FEED (FF);;;; + * 0020;SPACE;Zs;0;WS;;;;;N;;;;; + * 00A0;NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;NON-BREAKING SPACE;;;; + * FEFF;ZERO WIDTH NO-BREAK SPACE;Cf;0;BN;;;;;N;BYTE ORDER MARK;;;; + * + * It also specifies any Unicode category 'Zs' characters as white + * space. These can be extracted with the "tools/extract_chars.py" script. + * Current result: + * + * RAW OUTPUT: + * =========== + * 0020;SPACE;Zs;0;WS;;;;;N;;;;; + * 00A0;NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;NON-BREAKING SPACE;;;; + * 1680;OGHAM SPACE MARK;Zs;0;WS;;;;;N;;;;; + * 180E;MONGOLIAN VOWEL SEPARATOR;Zs;0;WS;;;;;N;;;;; + * 2000;EN QUAD;Zs;0;WS;2002;;;;N;;;;; + * 2001;EM QUAD;Zs;0;WS;2003;;;;N;;;;; + * 2002;EN SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 2003;EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 2004;THREE-PER-EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 2005;FOUR-PER-EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 2006;SIX-PER-EM SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 2007;FIGURE SPACE;Zs;0;WS;<noBreak> 0020;;;;N;;;;; + * 2008;PUNCTUATION SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 2009;THIN SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 200A;HAIR SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 202F;NARROW NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;;;;; + * 205F;MEDIUM MATHEMATICAL SPACE;Zs;0;WS;<compat> 0020;;;;N;;;;; + * 3000;IDEOGRAPHIC SPACE;Zs;0;WS;<wide> 0020;;;;N;;;;; + * + * RANGES: + * ======= + * 0x0020 + * 0x00a0 + * 0x1680 + * 0x180e + * 0x2000 ... 0x200a + * 0x202f + * 0x205f + * 0x3000 + * + * A manual decoder (below) is probably most compact for this. + */ + + duk_uint_fast8_t lo; + duk_uint_fast32_t hi; + + /* cp == -1 (EOF) never matches and causes return value 0 */ + + lo = (duk_uint_fast8_t) (cp & 0xff); + hi = (duk_uint_fast32_t) (cp >> 8); /* does not fit into an uchar */ + + if (hi == 0x0000UL) { + if (lo == 0x09U || lo == 0x0bU || lo == 0x0cU || + lo == 0x20U || lo == 0xa0U) { + return 1; + } + } else if (hi == 0x0020UL) { + if (lo <= 0x0aU || lo == 0x2fU || lo == 0x5fU) { + return 1; + } + } else if (cp == 0x1680L || cp == 0x180eL || cp == 0x3000L || + cp == 0xfeffL) { + return 1; + } + + return 0; +} + +/* + * "LineTerminator" production check. + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_is_line_terminator(duk_codepoint_t cp) { + /* + * E5 Section 7.3 + * + * A LineTerminatorSequence essentially merges <CR> <LF> sequences + * into a single line terminator. This must be handled by the caller. + */ + + if (cp == 0x000aL || cp == 0x000dL || cp == 0x2028L || + cp == 0x2029L) { + return 1; + } + + return 0; +} + +/* + * "IdentifierStart" production check. + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_is_identifier_start(duk_codepoint_t cp) { + /* + * E5 Section 7.6: + * + * IdentifierStart: + * UnicodeLetter + * $ + * _ + * \ UnicodeEscapeSequence + * + * IdentifierStart production has one multi-character production: + * + * \ UnicodeEscapeSequence + * + * The '\' character is -not- matched by this function. Rather, the caller + * should decode the escape and then call this function to check whether the + * decoded character is acceptable (see discussion in E5 Section 7.6). + * + * The "UnicodeLetter" alternative of the production allows letters + * from various Unicode categories. These can be extracted with the + * "tools/extract_chars.py" script. + * + * Because the result has hundreds of Unicode codepoint ranges, matching + * for any values >= 0x80 are done using a very slow range-by-range scan + * and a packed range format. + * + * The ASCII portion (codepoints 0x00 ... 0x7f) is fast-pathed below because + * it matters the most. The ASCII related ranges of IdentifierStart are: + * + * 0x0041 ... 0x005a ['A' ... 'Z'] + * 0x0061 ... 0x007a ['a' ... 'z'] + * 0x0024 ['$'] + * 0x005f ['_'] + */ + + /* ASCII (and EOF) fast path -- quick accept and reject */ + if (cp <= 0x7fL) { +#if defined(DUK_USE_IDCHAR_FASTPATH) + return (cp >= 0) && (duk_is_idchar_tab[cp] > 0); +#else + if ((cp >= 'a' && cp <= 'z') || + (cp >= 'A' && cp <= 'Z') || + cp == '_' || cp == '$') { + return 1; + } + return 0; +#endif + } + + /* Non-ASCII slow path (range-by-range linear comparison), very slow */ + +#if defined(DUK_USE_SOURCE_NONBMP) + if (duk__uni_range_match(duk_unicode_ids_noa, + (duk_size_t) sizeof(duk_unicode_ids_noa), + (duk_codepoint_t) cp)) { + return 1; + } + return 0; +#else + if (cp < 0x10000L) { + if (duk__uni_range_match(duk_unicode_ids_noabmp, + sizeof(duk_unicode_ids_noabmp), + (duk_codepoint_t) cp)) { + return 1; + } + return 0; + } else { + /* without explicit non-BMP support, assume non-BMP characters + * are always accepted as identifier characters. + */ + return 1; + } +#endif +} + +/* + * "IdentifierPart" production check. + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_is_identifier_part(duk_codepoint_t cp) { + /* + * E5 Section 7.6: + * + * IdentifierPart: + * IdentifierStart + * UnicodeCombiningMark + * UnicodeDigit + * UnicodeConnectorPunctuation + * <ZWNJ> [U+200C] + * <ZWJ> [U+200D] + * + * IdentifierPart production has one multi-character production + * as part of its IdentifierStart alternative. The '\' character + * of an escape sequence is not matched here, see discussion in + * duk_unicode_is_identifier_start(). + * + * To match non-ASCII characters (codepoints >= 0x80), a very slow + * linear range-by-range scan is used. The codepoint is first compared + * to the IdentifierStart ranges, and if it doesn't match, then to a + * set consisting of code points in IdentifierPart but not in + * IdentifierStart. This is done to keep the unicode range data small, + * at the expense of speed. + * + * The ASCII fast path consists of: + * + * 0x0030 ... 0x0039 ['0' ... '9', UnicodeDigit] + * 0x0041 ... 0x005a ['A' ... 'Z', IdentifierStart] + * 0x0061 ... 0x007a ['a' ... 'z', IdentifierStart] + * 0x0024 ['$', IdentifierStart] + * 0x005f ['_', IdentifierStart and + * UnicodeConnectorPunctuation] + * + * UnicodeCombiningMark has no code points <= 0x7f. + * + * The matching code reuses the "identifier start" tables, and then + * consults a separate range set for characters in "identifier part" + * but not in "identifier start". These can be extracted with the + * "tools/extract_chars.py" script. + * + * UnicodeCombiningMark -> categories Mn, Mc + * UnicodeDigit -> categories Nd + * UnicodeConnectorPunctuation -> categories Pc + */ + + /* ASCII (and EOF) fast path -- quick accept and reject */ + if (cp <= 0x7fL) { +#if defined(DUK_USE_IDCHAR_FASTPATH) + return (cp >= 0) && (duk_is_idchar_tab[cp] != 0); +#else + if ((cp >= 'a' && cp <= 'z') || + (cp >= 'A' && cp <= 'Z') || + (cp >= '0' && cp <= '9') || + cp == '_' || cp == '$') { + return 1; + } + return 0; +#endif + } + + /* Non-ASCII slow path (range-by-range linear comparison), very slow */ + +#if defined(DUK_USE_SOURCE_NONBMP) + if (duk__uni_range_match(duk_unicode_ids_noa, + sizeof(duk_unicode_ids_noa), + (duk_codepoint_t) cp) || + duk__uni_range_match(duk_unicode_idp_m_ids_noa, + sizeof(duk_unicode_idp_m_ids_noa), + (duk_codepoint_t) cp)) { + return 1; + } + return 0; +#else + if (cp < 0x10000L) { + if (duk__uni_range_match(duk_unicode_ids_noabmp, + sizeof(duk_unicode_ids_noabmp), + (duk_codepoint_t) cp) || + duk__uni_range_match(duk_unicode_idp_m_ids_noabmp, + sizeof(duk_unicode_idp_m_ids_noabmp), + (duk_codepoint_t) cp)) { + return 1; + } + return 0; + } else { + /* without explicit non-BMP support, assume non-BMP characters + * are always accepted as identifier characters. + */ + return 1; + } +#endif +} + +/* + * Unicode letter check. + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_is_letter(duk_codepoint_t cp) { + /* + * Unicode letter is now taken to be the categories: + * + * Lu, Ll, Lt, Lm, Lo + * + * (Not sure if this is exactly correct.) + * + * The ASCII fast path consists of: + * + * 0x0041 ... 0x005a ['A' ... 'Z'] + * 0x0061 ... 0x007a ['a' ... 'z'] + */ + + /* ASCII (and EOF) fast path -- quick accept and reject */ + if (cp <= 0x7fL) { + if ((cp >= 'a' && cp <= 'z') || + (cp >= 'A' && cp <= 'Z')) { + return 1; + } + return 0; + } + + /* Non-ASCII slow path (range-by-range linear comparison), very slow */ + +#if defined(DUK_USE_SOURCE_NONBMP) + if (duk__uni_range_match(duk_unicode_ids_noa, + sizeof(duk_unicode_ids_noa), + (duk_codepoint_t) cp) && + !duk__uni_range_match(duk_unicode_ids_m_let_noa, + sizeof(duk_unicode_ids_m_let_noa), + (duk_codepoint_t) cp)) { + return 1; + } + return 0; +#else + if (cp < 0x10000L) { + if (duk__uni_range_match(duk_unicode_ids_noabmp, + sizeof(duk_unicode_ids_noabmp), + (duk_codepoint_t) cp) && + !duk__uni_range_match(duk_unicode_ids_m_let_noabmp, + sizeof(duk_unicode_ids_m_let_noabmp), + (duk_codepoint_t) cp)) { + return 1; + } + return 0; + } else { + /* without explicit non-BMP support, assume non-BMP characters + * are always accepted as letters. + */ + return 1; + } +#endif +} + +/* + * Complex case conversion helper which decodes a bit-packed conversion + * control stream generated by tools/extract_caseconv.py. The conversion + * is very slow because it runs through the conversion data in a linear + * fashion to save space (which is why ASCII characters have a special + * fast path before arriving here). + * + * The particular bit counts etc have been determined experimentally to + * be small but still sufficient, and must match the Python script + * (tools/extract_caseconv.py). + * + * The return value is the case converted codepoint or -1 if the conversion + * results in multiple characters (this is useful for regexp Canonicalization + * operation). If 'buf' is not NULL, the result codepoint(s) are also + * appended to the hbuffer. + * + * Context and locale specific rules must be checked before consulting + * this function. + */ + +DUK_LOCAL +duk_codepoint_t duk__slow_case_conversion(duk_hthread *thr, + duk_bufwriter_ctx *bw, + duk_codepoint_t cp, + duk_bitdecoder_ctx *bd_ctx) { + duk_small_int_t skip = 0; + duk_small_int_t n; + duk_small_int_t t; + duk_small_int_t count; + duk_codepoint_t tmp_cp; + duk_codepoint_t start_i; + duk_codepoint_t start_o; + + DUK_ASSERT(bd_ctx != NULL); + DUK_UNREF(thr); + + DUK_DDD(DUK_DDDPRINT("slow case conversion for codepoint: %ld", (long) cp)); + + /* range conversion with a "skip" */ + DUK_DDD(DUK_DDDPRINT("checking ranges")); + for (;;) { + skip++; + n = (duk_small_int_t) duk_bd_decode(bd_ctx, 6); + if (n == 0x3f) { + /* end marker */ + break; + } + DUK_DDD(DUK_DDDPRINT("skip=%ld, n=%ld", (long) skip, (long) n)); + + while (n--) { + start_i = (duk_codepoint_t) duk_bd_decode(bd_ctx, 16); + start_o = (duk_codepoint_t) duk_bd_decode(bd_ctx, 16); + count = (duk_small_int_t) duk_bd_decode(bd_ctx, 7); + DUK_DDD(DUK_DDDPRINT("range: start_i=%ld, start_o=%ld, count=%ld, skip=%ld", + (long) start_i, (long) start_o, (long) count, (long) skip)); + + if (cp >= start_i) { + tmp_cp = cp - start_i; /* always >= 0 */ + if (tmp_cp < (duk_codepoint_t) count * (duk_codepoint_t) skip && + (tmp_cp % (duk_codepoint_t) skip) == 0) { + DUK_DDD(DUK_DDDPRINT("range matches input codepoint")); + cp = start_o + tmp_cp; + goto single; + } + } + } + } + + /* 1:1 conversion */ + n = (duk_small_int_t) duk_bd_decode(bd_ctx, 7); + DUK_DDD(DUK_DDDPRINT("checking 1:1 conversions (count %ld)", (long) n)); + while (n--) { + start_i = (duk_codepoint_t) duk_bd_decode(bd_ctx, 16); + start_o = (duk_codepoint_t) duk_bd_decode(bd_ctx, 16); + DUK_DDD(DUK_DDDPRINT("1:1 conversion %ld -> %ld", (long) start_i, (long) start_o)); + if (cp == start_i) { + DUK_DDD(DUK_DDDPRINT("1:1 matches input codepoint")); + cp = start_o; + goto single; + } + } + + /* complex, multicharacter conversion */ + n = (duk_small_int_t) duk_bd_decode(bd_ctx, 7); + DUK_DDD(DUK_DDDPRINT("checking 1:n conversions (count %ld)", (long) n)); + while (n--) { + start_i = (duk_codepoint_t) duk_bd_decode(bd_ctx, 16); + t = (duk_small_int_t) duk_bd_decode(bd_ctx, 2); + DUK_DDD(DUK_DDDPRINT("1:n conversion %ld -> %ld chars", (long) start_i, (long) t)); + if (cp == start_i) { + DUK_DDD(DUK_DDDPRINT("1:n matches input codepoint")); + if (bw != NULL) { + while (t--) { + tmp_cp = (duk_codepoint_t) duk_bd_decode(bd_ctx, 16); + DUK_BW_WRITE_RAW_XUTF8(thr, bw, (duk_ucodepoint_t) tmp_cp); + } + } + return -1; + } else { + while (t--) { + (void) duk_bd_decode(bd_ctx, 16); + } + } + } + + /* default: no change */ + DUK_DDD(DUK_DDDPRINT("no rule matches, output is same as input")); + /* fall through */ + + single: + if (bw != NULL) { + DUK_BW_WRITE_RAW_XUTF8(thr, bw, (duk_ucodepoint_t) cp); + } + return cp; +} + +/* + * Case conversion helper, with context/local sensitivity. + * For proper case conversion, one needs to know the character + * and the preceding and following characters, as well as + * locale/language. + */ + +/* XXX: add 'language' argument when locale/language sensitive rule + * support added. + */ +DUK_LOCAL +duk_codepoint_t duk__case_transform_helper(duk_hthread *thr, + duk_bufwriter_ctx *bw, + duk_codepoint_t cp, + duk_codepoint_t prev, + duk_codepoint_t next, + duk_bool_t uppercase) { + duk_bitdecoder_ctx bd_ctx; + + /* fast path for ASCII */ + if (cp < 0x80L) { + /* XXX: there are language sensitive rules for the ASCII range. + * If/when language/locale support is implemented, they need to + * be implemented here for the fast path. There are no context + * sensitive rules for ASCII range. + */ + + if (uppercase) { + if (cp >= 'a' && cp <= 'z') { + cp = cp - 'a' + 'A'; + } + } else { + if (cp >= 'A' && cp <= 'Z') { + cp = cp - 'A' + 'a'; + } + } + + if (bw != NULL) { + DUK_BW_WRITE_RAW_U8(thr, bw, (duk_uint8_t) cp); + } + return cp; + } + + /* context and locale specific rules which cannot currently be represented + * in the caseconv bitstream: hardcoded rules in C + */ + if (uppercase) { + /* XXX: turkish / azeri */ + } else { + /* + * Final sigma context specific rule. This is a rather tricky + * rule and this handling is probably not 100% correct now. + * The rule is not locale/language specific so it is supported. + */ + + if (cp == 0x03a3L && /* U+03A3 = GREEK CAPITAL LETTER SIGMA */ + duk_unicode_is_letter(prev) && /* prev exists and is not a letter */ + !duk_unicode_is_letter(next)) { /* next does not exist or next is not a letter */ + /* Capital sigma occurred at "end of word", lowercase to + * U+03C2 = GREEK SMALL LETTER FINAL SIGMA. Otherwise + * fall through and let the normal rules lowercase it to + * U+03C3 = GREEK SMALL LETTER SIGMA. + */ + cp = 0x03c2L; + goto singlechar; + } + + /* XXX: lithuanian not implemented */ + /* XXX: lithuanian, explicit dot rules */ + /* XXX: turkish / azeri, lowercase rules */ + } + + /* 1:1 or special conversions, but not locale/context specific: script generated rules */ + duk_memzero(&bd_ctx, sizeof(bd_ctx)); + if (uppercase) { + bd_ctx.data = (const duk_uint8_t *) duk_unicode_caseconv_uc; + bd_ctx.length = (duk_size_t) sizeof(duk_unicode_caseconv_uc); + } else { + bd_ctx.data = (const duk_uint8_t *) duk_unicode_caseconv_lc; + bd_ctx.length = (duk_size_t) sizeof(duk_unicode_caseconv_lc); + } + return duk__slow_case_conversion(thr, bw, cp, &bd_ctx); + + singlechar: + if (bw != NULL) { + DUK_BW_WRITE_RAW_XUTF8(thr, bw, (duk_ucodepoint_t) cp); + } + return cp; + + /* unused now, not needed until Turkish/Azeri */ +#if 0 + nochar: + return -1; +#endif +} + +/* + * Replace valstack top with case converted version. + */ + +DUK_INTERNAL void duk_unicode_case_convert_string(duk_hthread *thr, duk_bool_t uppercase) { + duk_hstring *h_input; + duk_bufwriter_ctx bw_alloc; + duk_bufwriter_ctx *bw; + const duk_uint8_t *p, *p_start, *p_end; + duk_codepoint_t prev, curr, next; + + h_input = duk_require_hstring(thr, -1); /* Accept symbols. */ + DUK_ASSERT(h_input != NULL); + + bw = &bw_alloc; + DUK_BW_INIT_PUSHBUF(thr, bw, DUK_HSTRING_GET_BYTELEN(h_input)); + + /* [ ... input buffer ] */ + + p_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_input); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input); + p = p_start; + + prev = -1; DUK_UNREF(prev); + curr = -1; + next = -1; + for (;;) { + prev = curr; + curr = next; + next = -1; + if (p < p_end) { + next = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(thr, &p, p_start, p_end); + } else { + /* end of input and last char has been processed */ + if (curr < 0) { + break; + } + } + + /* on first round, skip */ + if (curr >= 0) { + /* XXX: could add a fast path to process chunks of input codepoints, + * but relative benefit would be quite small. + */ + + /* Ensure space for maximum multi-character result; estimate is overkill. */ + DUK_BW_ENSURE(thr, bw, 8 * DUK_UNICODE_MAX_XUTF8_LENGTH); + + duk__case_transform_helper(thr, + bw, + (duk_codepoint_t) curr, + prev, + next, + uppercase); + } + } + + DUK_BW_COMPACT(thr, bw); + (void) duk_buffer_to_string(thr, -1); /* Safe, output is encoded. */ + /* invalidates h_buf pointer */ + duk_remove_m2(thr); +} + +#if defined(DUK_USE_REGEXP_SUPPORT) + +/* + * Canonicalize() abstract operation needed for canonicalization of individual + * codepoints during regexp compilation and execution, see E5 Section 15.10.2.8. + * Note that codepoints are canonicalized one character at a time, so no context + * specific rules can apply. Locale specific rules can apply, though. + */ + +DUK_INTERNAL duk_codepoint_t duk_unicode_re_canonicalize_char(duk_hthread *thr, duk_codepoint_t cp) { +#if defined(DUK_USE_REGEXP_CANON_WORKAROUND) + /* Fast canonicalization lookup at the cost of 128kB footprint. */ + DUK_ASSERT(cp >= 0); + DUK_UNREF(thr); + if (DUK_LIKELY(cp < 0x10000L)) { + return (duk_codepoint_t) duk_unicode_re_canon_lookup[cp]; + } + return cp; +#else /* DUK_USE_REGEXP_CANON_WORKAROUND */ + duk_codepoint_t y; + + y = duk__case_transform_helper(thr, + NULL, /* NULL is allowed, no output */ + cp, /* curr char */ + -1, /* prev char */ + -1, /* next char */ + 1); /* uppercase */ + + if ((y < 0) || (cp >= 0x80 && y < 0x80)) { + /* multiple codepoint conversion or non-ASCII mapped to ASCII + * --> leave as is. + */ + return cp; + } + + return y; +#endif /* DUK_USE_REGEXP_CANON_WORKAROUND */ +} + +/* + * E5 Section 15.10.2.6 "IsWordChar" abstract operation. Assume + * x < 0 for characters read outside the string. + */ + +DUK_INTERNAL duk_small_int_t duk_unicode_re_is_wordchar(duk_codepoint_t x) { + /* + * Note: the description in E5 Section 15.10.2.6 has a typo, it + * contains 'A' twice and lacks 'a'; the intent is [0-9a-zA-Z_]. + */ + if ((x >= '0' && x <= '9') || + (x >= 'a' && x <= 'z') || + (x >= 'A' && x <= 'Z') || + (x == '_')) { + return 1; + } + return 0; +} + +/* + * Regexp range tables + */ + +/* exposed because lexer needs these too */ +DUK_INTERNAL const duk_uint16_t duk_unicode_re_ranges_digit[2] = { + (duk_uint16_t) 0x0030UL, (duk_uint16_t) 0x0039UL, +}; +DUK_INTERNAL const duk_uint16_t duk_unicode_re_ranges_white[22] = { + (duk_uint16_t) 0x0009UL, (duk_uint16_t) 0x000DUL, + (duk_uint16_t) 0x0020UL, (duk_uint16_t) 0x0020UL, + (duk_uint16_t) 0x00A0UL, (duk_uint16_t) 0x00A0UL, + (duk_uint16_t) 0x1680UL, (duk_uint16_t) 0x1680UL, + (duk_uint16_t) 0x180EUL, (duk_uint16_t) 0x180EUL, + (duk_uint16_t) 0x2000UL, (duk_uint16_t) 0x200AUL, + (duk_uint16_t) 0x2028UL, (duk_uint16_t) 0x2029UL, + (duk_uint16_t) 0x202FUL, (duk_uint16_t) 0x202FUL, + (duk_uint16_t) 0x205FUL, (duk_uint16_t) 0x205FUL, + (duk_uint16_t) 0x3000UL, (duk_uint16_t) 0x3000UL, + (duk_uint16_t) 0xFEFFUL, (duk_uint16_t) 0xFEFFUL, +}; +DUK_INTERNAL const duk_uint16_t duk_unicode_re_ranges_wordchar[8] = { + (duk_uint16_t) 0x0030UL, (duk_uint16_t) 0x0039UL, + (duk_uint16_t) 0x0041UL, (duk_uint16_t) 0x005AUL, + (duk_uint16_t) 0x005FUL, (duk_uint16_t) 0x005FUL, + (duk_uint16_t) 0x0061UL, (duk_uint16_t) 0x007AUL, +}; +DUK_INTERNAL const duk_uint16_t duk_unicode_re_ranges_not_digit[4] = { + (duk_uint16_t) 0x0000UL, (duk_uint16_t) 0x002FUL, + (duk_uint16_t) 0x003AUL, (duk_uint16_t) 0xFFFFUL, +}; +DUK_INTERNAL const duk_uint16_t duk_unicode_re_ranges_not_white[24] = { + (duk_uint16_t) 0x0000UL, (duk_uint16_t) 0x0008UL, + (duk_uint16_t) 0x000EUL, (duk_uint16_t) 0x001FUL, + (duk_uint16_t) 0x0021UL, (duk_uint16_t) 0x009FUL, + (duk_uint16_t) 0x00A1UL, (duk_uint16_t) 0x167FUL, + (duk_uint16_t) 0x1681UL, (duk_uint16_t) 0x180DUL, + (duk_uint16_t) 0x180FUL, (duk_uint16_t) 0x1FFFUL, + (duk_uint16_t) 0x200BUL, (duk_uint16_t) 0x2027UL, + (duk_uint16_t) 0x202AUL, (duk_uint16_t) 0x202EUL, + (duk_uint16_t) 0x2030UL, (duk_uint16_t) 0x205EUL, + (duk_uint16_t) 0x2060UL, (duk_uint16_t) 0x2FFFUL, + (duk_uint16_t) 0x3001UL, (duk_uint16_t) 0xFEFEUL, + (duk_uint16_t) 0xFF00UL, (duk_uint16_t) 0xFFFFUL, +}; +DUK_INTERNAL const duk_uint16_t duk_unicode_re_ranges_not_wordchar[10] = { + (duk_uint16_t) 0x0000UL, (duk_uint16_t) 0x002FUL, + (duk_uint16_t) 0x003AUL, (duk_uint16_t) 0x0040UL, + (duk_uint16_t) 0x005BUL, (duk_uint16_t) 0x005EUL, + (duk_uint16_t) 0x0060UL, (duk_uint16_t) 0x0060UL, + (duk_uint16_t) 0x007BUL, (duk_uint16_t) 0xFFFFUL, +}; + +#endif /* DUK_USE_REGEXP_SUPPORT */ +#line 1 "duk_util_misc.c" +/* + * Misc util stuff. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Lowercase digits for radix values 2 to 36. Also doubles as lowercase + * hex nybble table. + */ + +DUK_INTERNAL const duk_uint8_t duk_lc_digits[36] = { + DUK_ASC_0, DUK_ASC_1, DUK_ASC_2, DUK_ASC_3, + DUK_ASC_4, DUK_ASC_5, DUK_ASC_6, DUK_ASC_7, + DUK_ASC_8, DUK_ASC_9, DUK_ASC_LC_A, DUK_ASC_LC_B, + DUK_ASC_LC_C, DUK_ASC_LC_D, DUK_ASC_LC_E, DUK_ASC_LC_F, + DUK_ASC_LC_G, DUK_ASC_LC_H, DUK_ASC_LC_I, DUK_ASC_LC_J, + DUK_ASC_LC_K, DUK_ASC_LC_L, DUK_ASC_LC_M, DUK_ASC_LC_N, + DUK_ASC_LC_O, DUK_ASC_LC_P, DUK_ASC_LC_Q, DUK_ASC_LC_R, + DUK_ASC_LC_S, DUK_ASC_LC_T, DUK_ASC_LC_U, DUK_ASC_LC_V, + DUK_ASC_LC_W, DUK_ASC_LC_X, DUK_ASC_LC_Y, DUK_ASC_LC_Z +}; + +DUK_INTERNAL const duk_uint8_t duk_uc_nybbles[16] = { + DUK_ASC_0, DUK_ASC_1, DUK_ASC_2, DUK_ASC_3, + DUK_ASC_4, DUK_ASC_5, DUK_ASC_6, DUK_ASC_7, + DUK_ASC_8, DUK_ASC_9, DUK_ASC_UC_A, DUK_ASC_UC_B, + DUK_ASC_UC_C, DUK_ASC_UC_D, DUK_ASC_UC_E, DUK_ASC_UC_F +}; + +/* + * Table for hex decoding ASCII hex digits + */ + +DUK_INTERNAL const duk_int8_t duk_hex_dectab[256] = { + /* -1 if invalid */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x00-0x0f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x10-0x1f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x20-0x2f */ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /* 0x30-0x3f */ + -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x40-0x4f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x50-0x5f */ + -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x60-0x6f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x70-0x7f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x80-0x8f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x90-0x9f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xa0-0xaf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xb0-0xbf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xc0-0xcf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xd0-0xdf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xe0-0xef */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 /* 0xf0-0xff */ +}; + +#if defined(DUK_USE_HEX_FASTPATH) +/* Preshifted << 4. Must use 16-bit entry to allow negative value signaling. */ +DUK_INTERNAL const duk_int16_t duk_hex_dectab_shift4[256] = { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x00-0x0f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x10-0x1f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x20-0x2f */ + 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80, 0x90, -1, -1, -1, -1, -1, -1, /* 0x30-0x3f */ + -1, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0, 0xf0, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x40-0x4f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x50-0x5f */ + -1, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0, 0xf0, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x60-0x6f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x70-0x7f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x80-0x8f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0x90-0x9f */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xa0-0xaf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xb0-0xbf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xc0-0xcf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xd0-0xdf */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 0xe0-0xef */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 /* 0xf0-0xff */ +}; +#endif + +/* + * Table for hex encoding bytes + */ + +#if defined(DUK_USE_HEX_FASTPATH) +/* Lookup to encode one byte directly into 2 characters: + * + * def genhextab(bswap): + * for i in xrange(256): + * t = chr(i).encode('hex') + * if bswap: + * t = t[1] + t[0] + * print('0x' + t.encode('hex') + 'U') + * print('big endian'); genhextab(False) + * print('little endian'); genhextab(True) +*/ +DUK_INTERNAL const duk_uint16_t duk_hex_enctab[256] = { +#if defined(DUK_USE_INTEGER_BE) + 0x3030U, 0x3031U, 0x3032U, 0x3033U, 0x3034U, 0x3035U, 0x3036U, 0x3037U, + 0x3038U, 0x3039U, 0x3061U, 0x3062U, 0x3063U, 0x3064U, 0x3065U, 0x3066U, + 0x3130U, 0x3131U, 0x3132U, 0x3133U, 0x3134U, 0x3135U, 0x3136U, 0x3137U, + 0x3138U, 0x3139U, 0x3161U, 0x3162U, 0x3163U, 0x3164U, 0x3165U, 0x3166U, + 0x3230U, 0x3231U, 0x3232U, 0x3233U, 0x3234U, 0x3235U, 0x3236U, 0x3237U, + 0x3238U, 0x3239U, 0x3261U, 0x3262U, 0x3263U, 0x3264U, 0x3265U, 0x3266U, + 0x3330U, 0x3331U, 0x3332U, 0x3333U, 0x3334U, 0x3335U, 0x3336U, 0x3337U, + 0x3338U, 0x3339U, 0x3361U, 0x3362U, 0x3363U, 0x3364U, 0x3365U, 0x3366U, + 0x3430U, 0x3431U, 0x3432U, 0x3433U, 0x3434U, 0x3435U, 0x3436U, 0x3437U, + 0x3438U, 0x3439U, 0x3461U, 0x3462U, 0x3463U, 0x3464U, 0x3465U, 0x3466U, + 0x3530U, 0x3531U, 0x3532U, 0x3533U, 0x3534U, 0x3535U, 0x3536U, 0x3537U, + 0x3538U, 0x3539U, 0x3561U, 0x3562U, 0x3563U, 0x3564U, 0x3565U, 0x3566U, + 0x3630U, 0x3631U, 0x3632U, 0x3633U, 0x3634U, 0x3635U, 0x3636U, 0x3637U, + 0x3638U, 0x3639U, 0x3661U, 0x3662U, 0x3663U, 0x3664U, 0x3665U, 0x3666U, + 0x3730U, 0x3731U, 0x3732U, 0x3733U, 0x3734U, 0x3735U, 0x3736U, 0x3737U, + 0x3738U, 0x3739U, 0x3761U, 0x3762U, 0x3763U, 0x3764U, 0x3765U, 0x3766U, + 0x3830U, 0x3831U, 0x3832U, 0x3833U, 0x3834U, 0x3835U, 0x3836U, 0x3837U, + 0x3838U, 0x3839U, 0x3861U, 0x3862U, 0x3863U, 0x3864U, 0x3865U, 0x3866U, + 0x3930U, 0x3931U, 0x3932U, 0x3933U, 0x3934U, 0x3935U, 0x3936U, 0x3937U, + 0x3938U, 0x3939U, 0x3961U, 0x3962U, 0x3963U, 0x3964U, 0x3965U, 0x3966U, + 0x6130U, 0x6131U, 0x6132U, 0x6133U, 0x6134U, 0x6135U, 0x6136U, 0x6137U, + 0x6138U, 0x6139U, 0x6161U, 0x6162U, 0x6163U, 0x6164U, 0x6165U, 0x6166U, + 0x6230U, 0x6231U, 0x6232U, 0x6233U, 0x6234U, 0x6235U, 0x6236U, 0x6237U, + 0x6238U, 0x6239U, 0x6261U, 0x6262U, 0x6263U, 0x6264U, 0x6265U, 0x6266U, + 0x6330U, 0x6331U, 0x6332U, 0x6333U, 0x6334U, 0x6335U, 0x6336U, 0x6337U, + 0x6338U, 0x6339U, 0x6361U, 0x6362U, 0x6363U, 0x6364U, 0x6365U, 0x6366U, + 0x6430U, 0x6431U, 0x6432U, 0x6433U, 0x6434U, 0x6435U, 0x6436U, 0x6437U, + 0x6438U, 0x6439U, 0x6461U, 0x6462U, 0x6463U, 0x6464U, 0x6465U, 0x6466U, + 0x6530U, 0x6531U, 0x6532U, 0x6533U, 0x6534U, 0x6535U, 0x6536U, 0x6537U, + 0x6538U, 0x6539U, 0x6561U, 0x6562U, 0x6563U, 0x6564U, 0x6565U, 0x6566U, + 0x6630U, 0x6631U, 0x6632U, 0x6633U, 0x6634U, 0x6635U, 0x6636U, 0x6637U, + 0x6638U, 0x6639U, 0x6661U, 0x6662U, 0x6663U, 0x6664U, 0x6665U, 0x6666U +#else /* DUK_USE_INTEGER_BE */ + 0x3030U, 0x3130U, 0x3230U, 0x3330U, 0x3430U, 0x3530U, 0x3630U, 0x3730U, + 0x3830U, 0x3930U, 0x6130U, 0x6230U, 0x6330U, 0x6430U, 0x6530U, 0x6630U, + 0x3031U, 0x3131U, 0x3231U, 0x3331U, 0x3431U, 0x3531U, 0x3631U, 0x3731U, + 0x3831U, 0x3931U, 0x6131U, 0x6231U, 0x6331U, 0x6431U, 0x6531U, 0x6631U, + 0x3032U, 0x3132U, 0x3232U, 0x3332U, 0x3432U, 0x3532U, 0x3632U, 0x3732U, + 0x3832U, 0x3932U, 0x6132U, 0x6232U, 0x6332U, 0x6432U, 0x6532U, 0x6632U, + 0x3033U, 0x3133U, 0x3233U, 0x3333U, 0x3433U, 0x3533U, 0x3633U, 0x3733U, + 0x3833U, 0x3933U, 0x6133U, 0x6233U, 0x6333U, 0x6433U, 0x6533U, 0x6633U, + 0x3034U, 0x3134U, 0x3234U, 0x3334U, 0x3434U, 0x3534U, 0x3634U, 0x3734U, + 0x3834U, 0x3934U, 0x6134U, 0x6234U, 0x6334U, 0x6434U, 0x6534U, 0x6634U, + 0x3035U, 0x3135U, 0x3235U, 0x3335U, 0x3435U, 0x3535U, 0x3635U, 0x3735U, + 0x3835U, 0x3935U, 0x6135U, 0x6235U, 0x6335U, 0x6435U, 0x6535U, 0x6635U, + 0x3036U, 0x3136U, 0x3236U, 0x3336U, 0x3436U, 0x3536U, 0x3636U, 0x3736U, + 0x3836U, 0x3936U, 0x6136U, 0x6236U, 0x6336U, 0x6436U, 0x6536U, 0x6636U, + 0x3037U, 0x3137U, 0x3237U, 0x3337U, 0x3437U, 0x3537U, 0x3637U, 0x3737U, + 0x3837U, 0x3937U, 0x6137U, 0x6237U, 0x6337U, 0x6437U, 0x6537U, 0x6637U, + 0x3038U, 0x3138U, 0x3238U, 0x3338U, 0x3438U, 0x3538U, 0x3638U, 0x3738U, + 0x3838U, 0x3938U, 0x6138U, 0x6238U, 0x6338U, 0x6438U, 0x6538U, 0x6638U, + 0x3039U, 0x3139U, 0x3239U, 0x3339U, 0x3439U, 0x3539U, 0x3639U, 0x3739U, + 0x3839U, 0x3939U, 0x6139U, 0x6239U, 0x6339U, 0x6439U, 0x6539U, 0x6639U, + 0x3061U, 0x3161U, 0x3261U, 0x3361U, 0x3461U, 0x3561U, 0x3661U, 0x3761U, + 0x3861U, 0x3961U, 0x6161U, 0x6261U, 0x6361U, 0x6461U, 0x6561U, 0x6661U, + 0x3062U, 0x3162U, 0x3262U, 0x3362U, 0x3462U, 0x3562U, 0x3662U, 0x3762U, + 0x3862U, 0x3962U, 0x6162U, 0x6262U, 0x6362U, 0x6462U, 0x6562U, 0x6662U, + 0x3063U, 0x3163U, 0x3263U, 0x3363U, 0x3463U, 0x3563U, 0x3663U, 0x3763U, + 0x3863U, 0x3963U, 0x6163U, 0x6263U, 0x6363U, 0x6463U, 0x6563U, 0x6663U, + 0x3064U, 0x3164U, 0x3264U, 0x3364U, 0x3464U, 0x3564U, 0x3664U, 0x3764U, + 0x3864U, 0x3964U, 0x6164U, 0x6264U, 0x6364U, 0x6464U, 0x6564U, 0x6664U, + 0x3065U, 0x3165U, 0x3265U, 0x3365U, 0x3465U, 0x3565U, 0x3665U, 0x3765U, + 0x3865U, 0x3965U, 0x6165U, 0x6265U, 0x6365U, 0x6465U, 0x6565U, 0x6665U, + 0x3066U, 0x3166U, 0x3266U, 0x3366U, 0x3466U, 0x3566U, 0x3666U, 0x3766U, + 0x3866U, 0x3966U, 0x6166U, 0x6266U, 0x6366U, 0x6466U, 0x6566U, 0x6666U +#endif /* DUK_USE_INTEGER_BE */ +}; +#endif /* DUK_USE_HEX_FASTPATH */ + +/* + * Arbitrary byteswap for potentially unaligned values + * + * Used to byteswap pointers e.g. in debugger code. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) /* For now only needed by the debugger. */ +DUK_INTERNAL void duk_byteswap_bytes(duk_uint8_t *p, duk_small_uint_t len) { + duk_uint8_t tmp; + duk_uint8_t *q = p + len - 1; + + while (p - q < 0) { + tmp = *p; + *p = *q; + *q = tmp; + p++; + q--; + } +} +#endif +#line 1 "duk_hobject_class.c" +/* + * Hobject ECMAScript [[Class]]. + */ + +/* #include duk_internal.h -> already included */ + +#if (DUK_STRIDX_UC_ARGUMENTS > 255) +#error constant too large +#endif +#if (DUK_STRIDX_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_BOOLEAN > 255) +#error constant too large +#endif +#if (DUK_STRIDX_DATE > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_ERROR > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_FUNCTION > 255) +#error constant too large +#endif +#if (DUK_STRIDX_JSON > 255) +#error constant too large +#endif +#if (DUK_STRIDX_MATH > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_NUMBER > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_OBJECT > 255) +#error constant too large +#endif +#if (DUK_STRIDX_REG_EXP > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_STRING > 255) +#error constant too large +#endif +#if (DUK_STRIDX_GLOBAL > 255) +#error constant too large +#endif +#if (DUK_STRIDX_OBJ_ENV > 255) +#error constant too large +#endif +#if (DUK_STRIDX_DEC_ENV > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_POINTER > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UC_THREAD > 255) +#error constant too large +#endif +#if (DUK_STRIDX_ARRAY_BUFFER > 255) +#error constant too large +#endif +#if (DUK_STRIDX_DATA_VIEW > 255) +#error constant too large +#endif +#if (DUK_STRIDX_INT8_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UINT8_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UINT8_CLAMPED_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_INT16_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UINT16_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_INT32_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_UINT32_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_FLOAT32_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_FLOAT64_ARRAY > 255) +#error constant too large +#endif +#if (DUK_STRIDX_EMPTY_STRING > 255) +#error constant too large +#endif + +/* Note: assumes that these string indexes are 8-bit, genstrings.py must ensure that */ +DUK_INTERNAL duk_uint8_t duk_class_number_to_stridx[32] = { + DUK_STRIDX_EMPTY_STRING, /* NONE, intentionally empty */ + DUK_STRIDX_UC_OBJECT, + DUK_STRIDX_ARRAY, + DUK_STRIDX_UC_FUNCTION, + DUK_STRIDX_UC_ARGUMENTS, + DUK_STRIDX_UC_BOOLEAN, + DUK_STRIDX_DATE, + DUK_STRIDX_UC_ERROR, + DUK_STRIDX_JSON, + DUK_STRIDX_MATH, + DUK_STRIDX_UC_NUMBER, + DUK_STRIDX_REG_EXP, + DUK_STRIDX_UC_STRING, + DUK_STRIDX_GLOBAL, + DUK_STRIDX_UC_SYMBOL, + DUK_STRIDX_OBJ_ENV, + DUK_STRIDX_DEC_ENV, + DUK_STRIDX_UC_POINTER, + DUK_STRIDX_UC_THREAD, + DUK_STRIDX_ARRAY_BUFFER, + DUK_STRIDX_DATA_VIEW, + DUK_STRIDX_INT8_ARRAY, + DUK_STRIDX_UINT8_ARRAY, + DUK_STRIDX_UINT8_CLAMPED_ARRAY, + DUK_STRIDX_INT16_ARRAY, + DUK_STRIDX_UINT16_ARRAY, + DUK_STRIDX_INT32_ARRAY, + DUK_STRIDX_UINT32_ARRAY, + DUK_STRIDX_FLOAT32_ARRAY, + DUK_STRIDX_FLOAT64_ARRAY, + DUK_STRIDX_EMPTY_STRING, /* UNUSED, intentionally empty */ + DUK_STRIDX_EMPTY_STRING, /* UNUSED, intentionally empty */ +}; +#line 1 "duk_alloc_default.c" +/* + * Default allocation functions. + * + * Assumes behavior such as malloc allowing zero size, yielding + * a NULL or a unique pointer which is a no-op for free. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_PROVIDE_DEFAULT_ALLOC_FUNCTIONS) +DUK_INTERNAL void *duk_default_alloc_function(void *udata, duk_size_t size) { + void *res; + DUK_UNREF(udata); + res = DUK_ANSI_MALLOC(size); + DUK_DDD(DUK_DDDPRINT("default alloc function: %lu -> %p", + (unsigned long) size, (void *) res)); + return res; +} + +DUK_INTERNAL void *duk_default_realloc_function(void *udata, void *ptr, duk_size_t newsize) { + void *res; + DUK_UNREF(udata); + res = DUK_ANSI_REALLOC(ptr, newsize); + DUK_DDD(DUK_DDDPRINT("default realloc function: %p %lu -> %p", + (void *) ptr, (unsigned long) newsize, (void *) res)); + return res; +} + +DUK_INTERNAL void duk_default_free_function(void *udata, void *ptr) { + DUK_DDD(DUK_DDDPRINT("default free function: %p", (void *) ptr)); + DUK_UNREF(udata); + DUK_ANSI_FREE(ptr); +} +#endif /* DUK_USE_PROVIDE_DEFAULT_ALLOC_FUNCTIONS */ +#line 1 "duk_api_buffer.c" +/* + * Buffer + */ + +/* #include duk_internal.h -> already included */ + +DUK_EXTERNAL void *duk_resize_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t new_size) { + duk_hbuffer_dynamic *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hbuffer_dynamic *) duk_require_hbuffer(thr, idx); + DUK_ASSERT(h != NULL); + + if (!(DUK_HBUFFER_HAS_DYNAMIC(h) && !DUK_HBUFFER_HAS_EXTERNAL(h))) { + DUK_ERROR_TYPE(thr, DUK_STR_WRONG_BUFFER_TYPE); + DUK_WO_NORETURN(return NULL;); + } + + /* Maximum size check is handled by callee. */ + duk_hbuffer_resize(thr, h, new_size); + + return DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h); +} + +DUK_EXTERNAL void *duk_steal_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size) { + duk_hbuffer_dynamic *h; + void *ptr; + duk_size_t sz; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hbuffer_dynamic *) duk_require_hbuffer(thr, idx); + DUK_ASSERT(h != NULL); + + if (!(DUK_HBUFFER_HAS_DYNAMIC(h) && !DUK_HBUFFER_HAS_EXTERNAL(h))) { + DUK_ERROR_TYPE(thr, DUK_STR_WRONG_BUFFER_TYPE); + DUK_WO_NORETURN(return NULL;); + } + + /* Forget the previous allocation, setting size to 0 and alloc to + * NULL. Caller is responsible for freeing the previous allocation. + * Getting the allocation and clearing it is done in the same API + * call to avoid any chance of a realloc. + */ + ptr = DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h); + sz = DUK_HBUFFER_DYNAMIC_GET_SIZE(h); + if (out_size) { + *out_size = sz; + } + DUK_HBUFFER_DYNAMIC_SET_DATA_PTR_NULL(thr->heap, h); + DUK_HBUFFER_DYNAMIC_SET_SIZE(h, 0); + + return ptr; +} + +DUK_EXTERNAL void duk_config_buffer(duk_hthread *thr, duk_idx_t idx, void *ptr, duk_size_t len) { + duk_hbuffer_external *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hbuffer_external *) duk_require_hbuffer(thr, idx); + DUK_ASSERT(h != NULL); + + if (!DUK_HBUFFER_HAS_EXTERNAL(h)) { + DUK_ERROR_TYPE(thr, DUK_STR_WRONG_BUFFER_TYPE); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(h)); + + DUK_HBUFFER_EXTERNAL_SET_DATA_PTR(thr->heap, h, ptr); + DUK_HBUFFER_EXTERNAL_SET_SIZE(h, len); +} +#line 1 "duk_api_bytecode.c" +/* + * Bytecode dump/load + * + * The bytecode load primitive is more important performance-wise than the + * dump primitive. + * + * Unlike most Duktape API calls, bytecode dump/load is not guaranteed to be + * memory safe for invalid arguments - caller beware! There's little point + * in trying to achieve memory safety unless bytecode instructions are also + * validated which is not easy to do with indirect register references etc. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_BYTECODE_DUMP_SUPPORT) + +#define DUK__SER_MARKER 0xbf +#define DUK__SER_STRING 0x00 +#define DUK__SER_NUMBER 0x01 +#define DUK__BYTECODE_INITIAL_ALLOC 256 +#define DUK__NO_FORMALS 0xffffffffUL + +/* + * Dump/load helpers, xxx_raw() helpers do no buffer checks + */ + +DUK_LOCAL duk_uint8_t *duk__load_string_raw(duk_hthread *thr, duk_uint8_t *p) { + duk_uint32_t len; + + len = DUK_RAW_READ_U32_BE(p); + duk_push_lstring(thr, (const char *) p, len); + p += len; + return p; +} + +DUK_LOCAL duk_uint8_t *duk__load_buffer_raw(duk_hthread *thr, duk_uint8_t *p) { + duk_uint32_t len; + duk_uint8_t *buf; + + len = DUK_RAW_READ_U32_BE(p); + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, (duk_size_t) len); + DUK_ASSERT(buf != NULL); + duk_memcpy((void *) buf, (const void *) p, (size_t) len); + p += len; + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_hstring_raw(duk_uint8_t *p, duk_hstring *h) { + duk_size_t len; + duk_uint32_t tmp32; + + DUK_ASSERT(h != NULL); + + len = DUK_HSTRING_GET_BYTELEN(h); + DUK_ASSERT(len <= 0xffffffffUL); /* string limits */ + tmp32 = (duk_uint32_t) len; + DUK_RAW_WRITE_U32_BE(p, tmp32); + duk_memcpy((void *) p, + (const void *) DUK_HSTRING_GET_DATA(h), + len); + p += len; + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_hbuffer_raw(duk_hthread *thr, duk_uint8_t *p, duk_hbuffer *h) { + duk_size_t len; + duk_uint32_t tmp32; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h != NULL); + DUK_UNREF(thr); + + len = DUK_HBUFFER_GET_SIZE(h); + DUK_ASSERT(len <= 0xffffffffUL); /* buffer limits */ + tmp32 = (duk_uint32_t) len; + DUK_RAW_WRITE_U32_BE(p, tmp32); + /* When len == 0, buffer data pointer may be NULL. */ + duk_memcpy_unsafe((void *) p, + (const void *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h), + len); + p += len; + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_string_prop(duk_hthread *thr, duk_uint8_t *p, duk_bufwriter_ctx *bw_ctx, duk_hobject *func, duk_small_uint_t stridx) { + duk_hstring *h_str; + duk_tval *tv; + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) func, DUK_HTHREAD_GET_STRING(thr, stridx)); + if (tv != NULL && DUK_TVAL_IS_STRING(tv)) { + h_str = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h_str != NULL); + } else { + h_str = DUK_HTHREAD_STRING_EMPTY_STRING(thr); + DUK_ASSERT(h_str != NULL); + } + DUK_ASSERT(DUK_HSTRING_MAX_BYTELEN <= 0x7fffffffUL); /* ensures no overflow */ + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U + DUK_HSTRING_GET_BYTELEN(h_str), p); + p = duk__dump_hstring_raw(p, h_str); + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_buffer_prop(duk_hthread *thr, duk_uint8_t *p, duk_bufwriter_ctx *bw_ctx, duk_hobject *func, duk_small_uint_t stridx) { + duk_tval *tv; + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) func, DUK_HTHREAD_GET_STRING(thr, stridx)); + if (tv != NULL && DUK_TVAL_IS_BUFFER(tv)) { + duk_hbuffer *h_buf; + h_buf = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h_buf != NULL); + DUK_ASSERT(DUK_HBUFFER_MAX_BYTELEN <= 0x7fffffffUL); /* ensures no overflow */ + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U + DUK_HBUFFER_GET_SIZE(h_buf), p); + p = duk__dump_hbuffer_raw(thr, p, h_buf); + } else { + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U, p); + DUK_RAW_WRITE_U32_BE(p, 0); + } + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_uint32_prop(duk_hthread *thr, duk_uint8_t *p, duk_bufwriter_ctx *bw_ctx, duk_hobject *func, duk_small_uint_t stridx, duk_uint32_t def_value) { + duk_tval *tv; + duk_uint32_t val; + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) func, DUK_HTHREAD_GET_STRING(thr, stridx)); + if (tv != NULL && DUK_TVAL_IS_NUMBER(tv)) { + val = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv); + } else { + val = def_value; + } + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U, p); + DUK_RAW_WRITE_U32_BE(p, val); + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_varmap(duk_hthread *thr, duk_uint8_t *p, duk_bufwriter_ctx *bw_ctx, duk_hobject *func) { + duk_tval *tv; + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) func, DUK_HTHREAD_STRING_INT_VARMAP(thr)); + if (tv != NULL && DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + duk_uint_fast32_t i; + + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + /* We know _Varmap only has own properties so walk property + * table directly. We also know _Varmap is dense and all + * values are numbers; assert for these. GC and finalizers + * shouldn't affect _Varmap so side effects should be fine. + */ + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(h); i++) { + duk_hstring *key; + duk_tval *tv_val; + duk_uint32_t val; + + key = DUK_HOBJECT_E_GET_KEY(thr->heap, h, i); + DUK_ASSERT(key != NULL); /* _Varmap is dense */ + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, h, i)); + tv_val = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, h, i); + DUK_ASSERT(tv_val != NULL); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_val)); /* known to be number; in fact an integer */ +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv_val)); + DUK_ASSERT(DUK_TVAL_GET_FASTINT(tv_val) == (duk_int64_t) DUK_TVAL_GET_FASTINT_U32(tv_val)); /* known to be 32-bit */ + val = DUK_TVAL_GET_FASTINT_U32(tv_val); +#else + val = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv_val); +#endif + + DUK_ASSERT(DUK_HSTRING_MAX_BYTELEN <= 0x7fffffffUL); /* ensures no overflow */ + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U + DUK_HSTRING_GET_BYTELEN(key) + 4U, p); + p = duk__dump_hstring_raw(p, key); + DUK_RAW_WRITE_U32_BE(p, val); + } + } + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U, p); + DUK_RAW_WRITE_U32_BE(p, 0); /* end of _Varmap */ + return p; +} + +DUK_LOCAL duk_uint8_t *duk__dump_formals(duk_hthread *thr, duk_uint8_t *p, duk_bufwriter_ctx *bw_ctx, duk_hobject *func) { + duk_tval *tv; + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) func, DUK_HTHREAD_STRING_INT_FORMALS(thr)); + if (tv != NULL && DUK_TVAL_IS_OBJECT(tv)) { + duk_harray *h; + duk_uint32_t i; + + /* Here we rely on _Formals being a dense array containing + * strings. This should be the case unless _Formals has been + * tweaked by the application (which we don't support right + * now). + */ + h = (duk_harray *) DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_ARRAY((duk_hobject *) h)); + DUK_ASSERT(h->length <= DUK_HOBJECT_GET_ASIZE((duk_hobject *) h)); + + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U, p); + DUK_ASSERT(h->length != DUK__NO_FORMALS); /* limits */ + DUK_RAW_WRITE_U32_BE(p, h->length); + + for (i = 0; i < h->length; i++) { + duk_tval *tv_val; + duk_hstring *varname; + + tv_val = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, (duk_hobject *) h, i); + DUK_ASSERT(tv_val != NULL); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv_val)); + + varname = DUK_TVAL_GET_STRING(tv_val); + DUK_ASSERT(varname != NULL); + DUK_ASSERT(DUK_HSTRING_GET_BYTELEN(varname) >= 1); + + DUK_ASSERT(DUK_HSTRING_MAX_BYTELEN <= 0x7fffffffUL); /* ensures no overflow */ + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U + DUK_HSTRING_GET_BYTELEN(varname), p); + p = duk__dump_hstring_raw(p, varname); + } + } else { + DUK_DD(DUK_DDPRINT("dumping function without _Formals, emit marker to indicate missing _Formals")); + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 4U, p); + DUK_RAW_WRITE_U32_BE(p, DUK__NO_FORMALS); /* marker: no formals */ + } + return p; +} + +static duk_uint8_t *duk__dump_func(duk_hthread *thr, duk_hcompfunc *func, duk_bufwriter_ctx *bw_ctx, duk_uint8_t *p) { + duk_tval *tv, *tv_end; + duk_instr_t *ins, *ins_end; + duk_hobject **fn, **fn_end; + duk_hstring *h_str; + duk_uint32_t count_instr; + duk_uint32_t tmp32; + duk_uint16_t tmp16; + duk_double_t d; + + DUK_DD(DUK_DDPRINT("dumping function %p to %p: " + "consts=[%p,%p[ (%ld bytes, %ld items), " + "funcs=[%p,%p[ (%ld bytes, %ld items), " + "code=[%p,%p[ (%ld bytes, %ld items)", + (void *) func, + (void *) p, + (void *) DUK_HCOMPFUNC_GET_CONSTS_BASE(thr->heap, func), + (void *) DUK_HCOMPFUNC_GET_CONSTS_END(thr->heap, func), + (long) DUK_HCOMPFUNC_GET_CONSTS_SIZE(thr->heap, func), + (long) DUK_HCOMPFUNC_GET_CONSTS_COUNT(thr->heap, func), + (void *) DUK_HCOMPFUNC_GET_FUNCS_BASE(thr->heap, func), + (void *) DUK_HCOMPFUNC_GET_FUNCS_END(thr->heap, func), + (long) DUK_HCOMPFUNC_GET_FUNCS_SIZE(thr->heap, func), + (long) DUK_HCOMPFUNC_GET_FUNCS_COUNT(thr->heap, func), + (void *) DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, func), + (void *) DUK_HCOMPFUNC_GET_CODE_END(thr->heap, func), + (long) DUK_HCOMPFUNC_GET_CODE_SIZE(thr->heap, func), + (long) DUK_HCOMPFUNC_GET_CODE_COUNT(thr->heap, func))); + + DUK_ASSERT(DUK_USE_ESBC_MAX_BYTES <= 0x7fffffffUL); /* ensures no overflow */ + count_instr = (duk_uint32_t) DUK_HCOMPFUNC_GET_CODE_COUNT(thr->heap, func); + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 3U * 4U + 2U * 2U + 3U * 4U + count_instr * 4U, p); + + /* Fixed header info. */ + tmp32 = count_instr; + DUK_RAW_WRITE_U32_BE(p, tmp32); + tmp32 = (duk_uint32_t) DUK_HCOMPFUNC_GET_CONSTS_COUNT(thr->heap, func); + DUK_RAW_WRITE_U32_BE(p, tmp32); + tmp32 = (duk_uint32_t) DUK_HCOMPFUNC_GET_FUNCS_COUNT(thr->heap, func); + DUK_RAW_WRITE_U32_BE(p, tmp32); + tmp16 = func->nregs; + DUK_RAW_WRITE_U16_BE(p, tmp16); + tmp16 = func->nargs; + DUK_RAW_WRITE_U16_BE(p, tmp16); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + tmp32 = func->start_line; + DUK_RAW_WRITE_U32_BE(p, tmp32); + tmp32 = func->end_line; + DUK_RAW_WRITE_U32_BE(p, tmp32); +#else + DUK_RAW_WRITE_U32_BE(p, 0); + DUK_RAW_WRITE_U32_BE(p, 0); +#endif + tmp32 = DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) func); /* masks flags, only duk_hobject flags */ + tmp32 &= ~(DUK_HOBJECT_FLAG_HAVE_FINALIZER); /* finalizer flag is lost */ + DUK_RAW_WRITE_U32_BE(p, tmp32); + + /* Bytecode instructions: endian conversion needed unless + * platform is big endian. + */ + ins = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, func); + ins_end = DUK_HCOMPFUNC_GET_CODE_END(thr->heap, func); + DUK_ASSERT((duk_size_t) (ins_end - ins) == (duk_size_t) count_instr); +#if defined(DUK_USE_INTEGER_BE) + duk_memcpy_unsafe((void *) p, (const void *) ins, (size_t) (ins_end - ins)); + p += (size_t) (ins_end - ins); +#else + while (ins != ins_end) { + tmp32 = (duk_uint32_t) (*ins); + DUK_RAW_WRITE_U32_BE(p, tmp32); + ins++; + } +#endif + + /* Constants: variable size encoding. */ + tv = DUK_HCOMPFUNC_GET_CONSTS_BASE(thr->heap, func); + tv_end = DUK_HCOMPFUNC_GET_CONSTS_END(thr->heap, func); + while (tv != tv_end) { + /* constants are strings or numbers now */ + DUK_ASSERT(DUK_TVAL_IS_STRING(tv) || + DUK_TVAL_IS_NUMBER(tv)); + + if (DUK_TVAL_IS_STRING(tv)) { + h_str = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h_str != NULL); + DUK_ASSERT(DUK_HSTRING_MAX_BYTELEN <= 0x7fffffffUL); /* ensures no overflow */ + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 1U + 4U + DUK_HSTRING_GET_BYTELEN(h_str), p); + *p++ = DUK__SER_STRING; + p = duk__dump_hstring_raw(p, h_str); + } else { + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + p = DUK_BW_ENSURE_RAW(thr, bw_ctx, 1U + 8U, p); + *p++ = DUK__SER_NUMBER; + d = DUK_TVAL_GET_NUMBER(tv); + DUK_RAW_WRITE_DOUBLE_BE(p, d); + } + tv++; + } + + /* Inner functions recursively. */ + fn = (duk_hobject **) DUK_HCOMPFUNC_GET_FUNCS_BASE(thr->heap, func); + fn_end = (duk_hobject **) DUK_HCOMPFUNC_GET_FUNCS_END(thr->heap, func); + while (fn != fn_end) { + /* XXX: This causes recursion up to inner function depth + * which is normally not an issue, e.g. mark-and-sweep uses + * a recursion limiter to avoid C stack issues. Avoiding + * this would mean some sort of a work list or just refusing + * to serialize deep functions. + */ + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(*fn)); + p = duk__dump_func(thr, (duk_hcompfunc *) *fn, bw_ctx, p); + fn++; + } + + /* Lexenv and varenv are not dumped. */ + + /* Object extra properties. + * + * There are some difference between function templates and functions. + * For example, function templates don't have .length and nargs is + * normally used to instantiate the functions. + */ + + p = duk__dump_uint32_prop(thr, p, bw_ctx, (duk_hobject *) func, DUK_STRIDX_LENGTH, (duk_uint32_t) func->nargs); +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + p = duk__dump_string_prop(thr, p, bw_ctx, (duk_hobject *) func, DUK_STRIDX_NAME); +#endif +#if defined(DUK_USE_FUNC_FILENAME_PROPERTY) + p = duk__dump_string_prop(thr, p, bw_ctx, (duk_hobject *) func, DUK_STRIDX_FILE_NAME); +#endif +#if defined(DUK_USE_PC2LINE) + p = duk__dump_buffer_prop(thr, p, bw_ctx, (duk_hobject *) func, DUK_STRIDX_INT_PC2LINE); +#endif + p = duk__dump_varmap(thr, p, bw_ctx, (duk_hobject *) func); + p = duk__dump_formals(thr, p, bw_ctx, (duk_hobject *) func); + + DUK_DD(DUK_DDPRINT("serialized function %p -> final pointer %p", (void *) func, (void *) p)); + + return p; +} + +/* Load a function from bytecode. The function object returned here must + * match what is created by duk_js_push_closure() with respect to its flags, + * properties, etc. + * + * NOTE: there are intentionally no input buffer length / bound checks. + * Adding them would be easy but wouldn't ensure memory safety as untrusted + * or broken bytecode is unsafe during execution unless the opcodes themselves + * are validated (which is quite complex, especially for indirect opcodes). + */ + +#define DUK__ASSERT_LEFT(n) do { \ + DUK_ASSERT((duk_size_t) (p_end - p) >= (duk_size_t) (n)); \ + } while (0) + +static duk_uint8_t *duk__load_func(duk_hthread *thr, duk_uint8_t *p, duk_uint8_t *p_end) { + duk_hcompfunc *h_fun; + duk_hbuffer *h_data; + duk_size_t data_size; + duk_uint32_t count_instr, count_const, count_funcs; + duk_uint32_t n; + duk_uint32_t tmp32; + duk_small_uint_t const_type; + duk_uint8_t *fun_data; + duk_uint8_t *q; + duk_idx_t idx_base; + duk_tval *tv1; + duk_uarridx_t arr_idx; + duk_uarridx_t arr_limit; + duk_hobject *func_env; + duk_bool_t need_pop; + + /* XXX: There's some overlap with duk_js_closure() here, but + * seems difficult to share code. Ensure that the final function + * looks the same as created by duk_js_closure(). + */ + + DUK_ASSERT(thr != NULL); + + DUK_DD(DUK_DDPRINT("loading function, p=%p, p_end=%p", (void *) p, (void *) p_end)); + + DUK__ASSERT_LEFT(3 * 4); + count_instr = DUK_RAW_READ_U32_BE(p); + count_const = DUK_RAW_READ_U32_BE(p); + count_funcs = DUK_RAW_READ_U32_BE(p); + + data_size = sizeof(duk_tval) * count_const + + sizeof(duk_hobject *) * count_funcs + + sizeof(duk_instr_t) * count_instr; + + DUK_DD(DUK_DDPRINT("instr=%ld, const=%ld, funcs=%ld, data_size=%ld", + (long) count_instr, (long) count_const, + (long) count_const, (long) data_size)); + + /* Value stack is used to ensure reachability of constants and + * inner functions being loaded. Require enough space to handle + * large functions correctly. + */ + duk_require_stack(thr, (duk_idx_t) (2 + count_const + count_funcs)); + idx_base = duk_get_top(thr); + + /* Push function object, init flags etc. This must match + * duk_js_push_closure() quite carefully. + */ + h_fun = duk_push_hcompfunc(thr); + DUK_ASSERT(h_fun != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) h_fun)); + DUK_ASSERT(DUK_HCOMPFUNC_GET_DATA(thr->heap, h_fun) == NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_FUNCS(thr->heap, h_fun) == NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_BYTECODE(thr->heap, h_fun) == NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_fun) == thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); + + h_fun->nregs = DUK_RAW_READ_U16_BE(p); + h_fun->nargs = DUK_RAW_READ_U16_BE(p); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + h_fun->start_line = DUK_RAW_READ_U32_BE(p); + h_fun->end_line = DUK_RAW_READ_U32_BE(p); +#else + p += 8; /* skip line info */ +#endif + + /* duk_hcompfunc flags; quite version specific */ + tmp32 = DUK_RAW_READ_U32_BE(p); + DUK_HEAPHDR_SET_FLAGS((duk_heaphdr *) h_fun, tmp32); /* masks flags to only change duk_hobject flags */ + + /* standard prototype (no need to set here, already set) */ + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_fun) == thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); +#if 0 + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, &h_fun->obj, thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); +#endif + + /* assert just a few critical flags */ + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) h_fun) == DUK_HTYPE_OBJECT); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(&h_fun->obj)); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(&h_fun->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_NATFUNC(&h_fun->obj)); + DUK_ASSERT(!DUK_HOBJECT_IS_THREAD(&h_fun->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARRAY(&h_fun->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(&h_fun->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(&h_fun->obj)); + + /* Create function 'data' buffer but don't attach it yet. */ + fun_data = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, data_size); + DUK_ASSERT(fun_data != NULL); + + /* Load bytecode instructions. */ + DUK_ASSERT(sizeof(duk_instr_t) == 4); + DUK__ASSERT_LEFT(count_instr * sizeof(duk_instr_t)); +#if defined(DUK_USE_INTEGER_BE) + q = fun_data + sizeof(duk_tval) * count_const + sizeof(duk_hobject *) * count_funcs; + duk_memcpy((void *) q, + (const void *) p, + sizeof(duk_instr_t) * count_instr); + p += sizeof(duk_instr_t) * count_instr; +#else + q = fun_data + sizeof(duk_tval) * count_const + sizeof(duk_hobject *) * count_funcs; + for (n = count_instr; n > 0; n--) { + *((duk_instr_t *) (void *) q) = DUK_RAW_READ_U32_BE(p); + q += sizeof(duk_instr_t); + } +#endif + + /* Load constants onto value stack but don't yet copy to buffer. */ + for (n = count_const; n > 0; n--) { + DUK__ASSERT_LEFT(1); + const_type = DUK_RAW_READ_U8(p); + switch (const_type) { + case DUK__SER_STRING: { + p = duk__load_string_raw(thr, p); + break; + } + case DUK__SER_NUMBER: { + /* Important to do a fastint check so that constants are + * properly read back as fastints. + */ + duk_tval tv_tmp; + duk_double_t val; + DUK__ASSERT_LEFT(8); + val = DUK_RAW_READ_DOUBLE_BE(p); + DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(&tv_tmp, val); + duk_push_tval(thr, &tv_tmp); + break; + } + default: { + goto format_error; + } + } + } + + /* Load inner functions to value stack, but don't yet copy to buffer. */ + for (n = count_funcs; n > 0; n--) { + p = duk__load_func(thr, p, p_end); + if (p == NULL) { + goto format_error; + } + } + + /* With constants and inner functions on value stack, we can now + * atomically finish the function 'data' buffer, bump refcounts, + * etc. + * + * Here we take advantage of the value stack being just a duk_tval + * array: we can just memcpy() the constants as long as we incref + * them afterwards. + */ + + h_data = (duk_hbuffer *) duk_known_hbuffer(thr, idx_base + 1); + DUK_ASSERT(!DUK_HBUFFER_HAS_DYNAMIC(h_data)); + DUK_HCOMPFUNC_SET_DATA(thr->heap, h_fun, h_data); + DUK_HBUFFER_INCREF(thr, h_data); + + tv1 = duk_get_tval(thr, idx_base + 2); /* may be NULL if no constants or inner funcs */ + DUK_ASSERT((count_const == 0 && count_funcs == 0) || tv1 != NULL); + + q = fun_data; + duk_memcpy_unsafe((void *) q, (const void *) tv1, sizeof(duk_tval) * count_const); + for (n = count_const; n > 0; n--) { + DUK_TVAL_INCREF_FAST(thr, (duk_tval *) (void *) q); /* no side effects */ + q += sizeof(duk_tval); + } + tv1 += count_const; + + DUK_HCOMPFUNC_SET_FUNCS(thr->heap, h_fun, (duk_hobject **) (void *) q); + for (n = count_funcs; n > 0; n--) { + duk_hobject *h_obj; + + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1)); + h_obj = DUK_TVAL_GET_OBJECT(tv1); + DUK_ASSERT(h_obj != NULL); + tv1++; + DUK_HOBJECT_INCREF(thr, h_obj); + + *((duk_hobject **) (void *) q) = h_obj; + q += sizeof(duk_hobject *); + } + + DUK_HCOMPFUNC_SET_BYTECODE(thr->heap, h_fun, (duk_instr_t *) (void *) q); + + /* The function object is now reachable and refcounts are fine, + * so we can pop off all the temporaries. + */ + DUK_DDD(DUK_DDDPRINT("function is reachable, reset top; func: %!iT", duk_get_tval(thr, idx_base))); + duk_set_top(thr, idx_base + 1); + + /* Setup function properties. */ + tmp32 = DUK_RAW_READ_U32_BE(p); + duk_push_u32(thr, tmp32); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_C); + +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + p = duk__load_string_raw(thr, p); /* -> [ func funcname ] */ + func_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + DUK_ASSERT(func_env != NULL); + need_pop = 0; + if (DUK_HOBJECT_HAS_NAMEBINDING((duk_hobject *) h_fun)) { + /* Original function instance/template had NAMEBINDING. + * Must create a lexical environment on loading to allow + * recursive functions like 'function foo() { foo(); }'. + */ + duk_hdecenv *new_env; + + new_env = duk_hdecenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV)); + DUK_ASSERT(new_env != NULL); + DUK_ASSERT(new_env->thread == NULL); /* Closed. */ + DUK_ASSERT(new_env->varmap == NULL); + DUK_ASSERT(new_env->regbase_byteoff == 0); + DUK_ASSERT_HDECENV_VALID(new_env); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) new_env) == NULL); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *) new_env, func_env); + DUK_HOBJECT_INCREF(thr, func_env); + + func_env = (duk_hobject *) new_env; + + duk_push_hobject(thr, (duk_hobject *) new_env); + + duk_dup_m2(thr); /* -> [ func funcname env funcname ] */ + duk_dup(thr, idx_base); /* -> [ func funcname env funcname func ] */ + duk_xdef_prop(thr, -3, DUK_PROPDESC_FLAGS_NONE); /* -> [ func funcname env ] */ + + need_pop = 1; /* Need to pop env, but -after- updating h_fun and increfs. */ + } + DUK_ASSERT(func_env != NULL); + DUK_HCOMPFUNC_SET_LEXENV(thr->heap, h_fun, func_env); + DUK_HCOMPFUNC_SET_VARENV(thr->heap, h_fun, func_env); + DUK_HOBJECT_INCREF(thr, func_env); + DUK_HOBJECT_INCREF(thr, func_env); + if (need_pop) { + duk_pop(thr); + } + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C); +#endif /* DUK_USE_FUNC_NAME_PROPERTY */ + +#if defined(DUK_USE_FUNC_FILENAME_PROPERTY) + p = duk__load_string_raw(thr, p); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_FILE_NAME, DUK_PROPDESC_FLAGS_C); +#endif /* DUK_USE_FUNC_FILENAME_PROPERTY */ + + if (DUK_HOBJECT_HAS_CONSTRUCTABLE((duk_hobject *) h_fun)) { + /* Restore empty external .prototype only for constructable + * functions. + */ + duk_push_object(thr); + duk_dup_m2(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_CONSTRUCTOR, DUK_PROPDESC_FLAGS_WC); /* func.prototype.constructor = func */ + duk_compact_m1(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_PROTOTYPE, DUK_PROPDESC_FLAGS_W); + } + +#if defined(DUK_USE_PC2LINE) + p = duk__load_buffer_raw(thr, p); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_PC2LINE, DUK_PROPDESC_FLAGS_WC); +#endif /* DUK_USE_PC2LINE */ + + duk_push_object(thr); /* _Varmap */ + for (;;) { + /* XXX: awkward */ + p = duk__load_string_raw(thr, p); + if (duk_get_length(thr, -1) == 0) { + duk_pop(thr); + break; + } + tmp32 = DUK_RAW_READ_U32_BE(p); + duk_push_u32(thr, tmp32); + duk_put_prop(thr, -3); + } + duk_compact_m1(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VARMAP, DUK_PROPDESC_FLAGS_NONE); + + /* _Formals may have been missing in the original function, which is + * handled using a marker length. + */ + arr_limit = DUK_RAW_READ_U32_BE(p); + if (arr_limit != DUK__NO_FORMALS) { + duk_push_array(thr); /* _Formals */ + for (arr_idx = 0; arr_idx < arr_limit; arr_idx++) { + p = duk__load_string_raw(thr, p); + duk_put_prop_index(thr, -2, arr_idx); + } + duk_compact_m1(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_FORMALS, DUK_PROPDESC_FLAGS_NONE); + } else { + DUK_DD(DUK_DDPRINT("no _Formals in dumped function")); + } + + /* Return with final function pushed on stack top. */ + DUK_DD(DUK_DDPRINT("final loaded function: %!iT", duk_get_tval(thr, -1))); + DUK_ASSERT_TOP(thr, idx_base + 1); + return p; + + format_error: + return NULL; +} + +DUK_EXTERNAL void duk_dump_function(duk_hthread *thr) { + duk_hcompfunc *func; + duk_bufwriter_ctx bw_ctx_alloc; + duk_bufwriter_ctx *bw_ctx = &bw_ctx_alloc; + duk_uint8_t *p; + + DUK_ASSERT_API_ENTRY(thr); + + /* Bound functions don't have all properties so we'd either need to + * lookup the non-bound target function or reject bound functions. + * For now, bound functions are rejected with TypeError. + */ + func = duk_require_hcompfunc(thr, -1); + DUK_ASSERT(func != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(&func->obj)); + + /* Estimating the result size beforehand would be costly, so + * start with a reasonable size and extend as needed. + */ + DUK_BW_INIT_PUSHBUF(thr, bw_ctx, DUK__BYTECODE_INITIAL_ALLOC); + p = DUK_BW_GET_PTR(thr, bw_ctx); + *p++ = DUK__SER_MARKER; + p = duk__dump_func(thr, func, bw_ctx, p); + DUK_BW_SET_PTR(thr, bw_ctx, p); + DUK_BW_COMPACT(thr, bw_ctx); + + DUK_DD(DUK_DDPRINT("serialized result: %!T", duk_get_tval(thr, -1))); + + duk_remove_m2(thr); /* [ ... func buf ] -> [ ... buf ] */ +} + +DUK_EXTERNAL void duk_load_function(duk_hthread *thr) { + duk_uint8_t *p_buf, *p, *p_end; + duk_size_t sz; + + DUK_ASSERT_API_ENTRY(thr); + + p_buf = (duk_uint8_t *) duk_require_buffer(thr, -1, &sz); + DUK_ASSERT(p_buf != NULL); + + /* The caller is responsible for being sure that bytecode being loaded + * is valid and trusted. Invalid bytecode can cause memory unsafe + * behavior directly during loading or later during bytecode execution + * (instruction validation would be quite complex to implement). + * + * This signature check is the only sanity check for detecting + * accidental invalid inputs. The initial byte ensures no ordinary + * string or Symbol will be accepted by accident. + */ + p = p_buf; + p_end = p_buf + sz; + if (sz < 1 || p[0] != DUK__SER_MARKER) { + goto format_error; + } + p++; + + p = duk__load_func(thr, p, p_end); + if (p == NULL) { + goto format_error; + } + + duk_remove_m2(thr); /* [ ... buf func ] -> [ ... func ] */ + return; + + format_error: + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_BYTECODE); + DUK_WO_NORETURN(return;); +} + +#else /* DUK_USE_BYTECODE_DUMP_SUPPORT */ + +DUK_EXTERNAL void duk_dump_function(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_load_function(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} + +#endif /* DUK_USE_BYTECODE_DUMP_SUPPORT */ + +/* automatic undefs */ +#undef DUK__ASSERT_LEFT +#undef DUK__BYTECODE_INITIAL_ALLOC +#undef DUK__NO_FORMALS +#undef DUK__SER_MARKER +#undef DUK__SER_NUMBER +#undef DUK__SER_STRING +#line 1 "duk_api_call.c" +/* + * Calls. + * + * Protected variants should avoid ever throwing an error. Must be careful + * to catch errors related to value stack manipulation and property lookup, + * not just the call itself. + * + * The only exception is when arguments are insane, e.g. nargs/nrets are out + * of bounds; in such cases an error is thrown for two reasons. First, we + * can't always respect the value stack input/output guarantees in such cases + * so the caller would end up with the value stack in an unexpected state. + * Second, an attempt to create an error might itself fail (although this + * could be avoided by pushing a preallocated object/string or a primitive + * value). + */ + +/* #include duk_internal.h -> already included */ + +/* + * Helpers + */ + +struct duk__pcall_prop_args { + duk_idx_t obj_idx; + duk_idx_t nargs; + duk_small_uint_t call_flags; +}; +typedef struct duk__pcall_prop_args duk__pcall_prop_args; + +struct duk__pcall_method_args { + duk_idx_t nargs; + duk_small_uint_t call_flags; +}; +typedef struct duk__pcall_method_args duk__pcall_method_args; + +struct duk__pcall_args { + duk_idx_t nargs; + duk_small_uint_t call_flags; +}; +typedef struct duk__pcall_args duk__pcall_args; + +/* Compute and validate idx_func for a certain 'nargs' and 'other' + * parameter count (1 or 2, depending on whether 'this' binding is + * present). + */ +DUK_LOCAL duk_idx_t duk__call_get_idx_func(duk_hthread *thr, duk_idx_t nargs, duk_idx_t other) { + duk_idx_t idx_func; + + /* XXX: byte arithmetic? */ + + DUK_ASSERT(other >= 0); + + idx_func = duk_get_top(thr) - nargs - other; + if (DUK_UNLIKELY((idx_func | nargs) < 0)) { /* idx_func < 0 || nargs < 0; OR sign bits */ + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); + } + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + return idx_func; +} + +/* Compute idx_func, assume index will be valid. This is a valid assumption + * for protected calls: nargs < 0 is checked explicitly and duk_safe_call() + * validates the argument count. + */ +DUK_LOCAL duk_idx_t duk__call_get_idx_func_unvalidated(duk_hthread *thr, duk_idx_t nargs, duk_idx_t other) { + duk_idx_t idx_func; + + /* XXX: byte arithmetic? */ + + DUK_ASSERT(nargs >= 0); + DUK_ASSERT(other >= 0); + + idx_func = duk_get_top(thr) - nargs - other; + DUK_ASSERT(idx_func >= 0); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + return idx_func; +} + +/* Prepare value stack for a method call through an object property. + * May currently throw an error e.g. when getting the property. + */ +DUK_LOCAL void duk__call_prop_prep_stack(duk_hthread *thr, duk_idx_t normalized_obj_idx, duk_idx_t nargs) { + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(nargs >= 0); + + DUK_DDD(DUK_DDDPRINT("duk__call_prop_prep_stack, normalized_obj_idx=%ld, nargs=%ld, stacktop=%ld", + (long) normalized_obj_idx, (long) nargs, (long) duk_get_top(thr))); + + /* [... key arg1 ... argN] */ + + /* duplicate key */ + duk_dup(thr, -nargs - 1); /* Note: -nargs alone would fail for nargs == 0, this is OK */ + (void) duk_get_prop(thr, normalized_obj_idx); + + DUK_DDD(DUK_DDDPRINT("func: %!T", (duk_tval *) duk_get_tval(thr, -1))); + +#if defined(DUK_USE_VERBOSE_ERRORS) + if (DUK_UNLIKELY(!duk_is_callable(thr, -1))) { + duk_tval *tv_targ; + duk_tval *tv_base; + duk_tval *tv_key; + + tv_targ = DUK_GET_TVAL_NEGIDX(thr, -1); + tv_base = DUK_GET_TVAL_POSIDX(thr, normalized_obj_idx); + tv_key = DUK_GET_TVAL_NEGIDX(thr, -nargs - 2); + DUK_ASSERT(tv_targ >= thr->valstack_bottom && tv_targ < thr->valstack_top); + DUK_ASSERT(tv_base >= thr->valstack_bottom && tv_base < thr->valstack_top); + DUK_ASSERT(tv_key >= thr->valstack_bottom && tv_key < thr->valstack_top); + + duk_call_setup_propcall_error(thr, tv_targ, tv_base, tv_key); + } +#endif + + /* [... key arg1 ... argN func] */ + + duk_replace(thr, -nargs - 2); + + /* [... func arg1 ... argN] */ + + duk_dup(thr, normalized_obj_idx); + duk_insert(thr, -nargs - 1); + + /* [... func this arg1 ... argN] */ +} + +DUK_EXTERNAL void duk_call(duk_hthread *thr, duk_idx_t nargs) { + duk_small_uint_t call_flags; + duk_idx_t idx_func; + + DUK_ASSERT_API_ENTRY(thr); + + idx_func = duk__call_get_idx_func(thr, nargs, 1); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + + duk_insert_undefined(thr, idx_func + 1); + + call_flags = 0; /* not protected, respect reclimit, not constructor */ + duk_handle_call_unprotected(thr, idx_func, call_flags); +} + +DUK_EXTERNAL void duk_call_method(duk_hthread *thr, duk_idx_t nargs) { + duk_small_uint_t call_flags; + duk_idx_t idx_func; + + DUK_ASSERT_API_ENTRY(thr); + + idx_func = duk__call_get_idx_func(thr, nargs, 2); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + + call_flags = 0; /* not protected, respect reclimit, not constructor */ + duk_handle_call_unprotected(thr, idx_func, call_flags); +} + +DUK_EXTERNAL void duk_call_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_idx_t nargs) { + /* + * XXX: if duk_handle_call() took values through indices, this could be + * made much more sensible. However, duk_handle_call() needs to fudge + * the 'this' and 'func' values to handle bound functions, which is now + * done "in-place", so this is not a trivial change. + */ + + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); /* make absolute */ + if (DUK_UNLIKELY(nargs < 0)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return;); + } + + duk__call_prop_prep_stack(thr, obj_idx, nargs); + + duk_call_method(thr, nargs); +} + +DUK_LOCAL duk_ret_t duk__pcall_raw(duk_hthread *thr, void *udata) { + duk__pcall_args *args; + duk_idx_t idx_func; + duk_int_t ret; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(udata != NULL); + + args = (duk__pcall_args *) udata; + idx_func = duk__call_get_idx_func_unvalidated(thr, args->nargs, 1); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + + duk_insert_undefined(thr, idx_func + 1); + + ret = duk_handle_call_unprotected(thr, idx_func, args->call_flags); + DUK_ASSERT(ret == 0); + DUK_UNREF(ret); + + return 1; +} + +DUK_EXTERNAL duk_int_t duk_pcall(duk_hthread *thr, duk_idx_t nargs) { + duk__pcall_args args; + + DUK_ASSERT_API_ENTRY(thr); + + args.nargs = nargs; + if (DUK_UNLIKELY(nargs < 0)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return DUK_EXEC_ERROR;); + } + args.call_flags = 0; + + return duk_safe_call(thr, duk__pcall_raw, (void *) &args /*udata*/, nargs + 1 /*nargs*/, 1 /*nrets*/); +} + +DUK_LOCAL duk_ret_t duk__pcall_method_raw(duk_hthread *thr, void *udata) { + duk__pcall_method_args *args; + duk_idx_t idx_func; + duk_int_t ret; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(udata != NULL); + + args = (duk__pcall_method_args *) udata; + + idx_func = duk__call_get_idx_func_unvalidated(thr, args->nargs, 2); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + + ret = duk_handle_call_unprotected(thr, idx_func, args->call_flags); + DUK_ASSERT(ret == 0); + DUK_UNREF(ret); + + return 1; +} + +DUK_INTERNAL duk_int_t duk_pcall_method_flags(duk_hthread *thr, duk_idx_t nargs, duk_small_uint_t call_flags) { + duk__pcall_method_args args; + + DUK_ASSERT_API_ENTRY(thr); + + args.nargs = nargs; + if (DUK_UNLIKELY(nargs < 0)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return DUK_EXEC_ERROR;); + } + args.call_flags = call_flags; + + return duk_safe_call(thr, duk__pcall_method_raw, (void *) &args /*udata*/, nargs + 2 /*nargs*/, 1 /*nrets*/); +} + +DUK_EXTERNAL duk_int_t duk_pcall_method(duk_hthread *thr, duk_idx_t nargs) { + DUK_ASSERT_API_ENTRY(thr); + + return duk_pcall_method_flags(thr, nargs, 0); +} + +DUK_LOCAL duk_ret_t duk__pcall_prop_raw(duk_hthread *thr, void *udata) { + duk__pcall_prop_args *args; + duk_idx_t obj_idx; + duk_int_t ret; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(udata != NULL); + + args = (duk__pcall_prop_args *) udata; + + obj_idx = duk_require_normalize_index(thr, args->obj_idx); /* make absolute */ + duk__call_prop_prep_stack(thr, obj_idx, args->nargs); + + ret = duk_handle_call_unprotected_nargs(thr, args->nargs, args->call_flags); + DUK_ASSERT(ret == 0); + DUK_UNREF(ret); + return 1; +} + +DUK_EXTERNAL duk_int_t duk_pcall_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_idx_t nargs) { + duk__pcall_prop_args args; + + DUK_ASSERT_API_ENTRY(thr); + + args.obj_idx = obj_idx; + args.nargs = nargs; + if (DUK_UNLIKELY(nargs < 0)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return DUK_EXEC_ERROR;); + } + args.call_flags = 0; + + return duk_safe_call(thr, duk__pcall_prop_raw, (void *) &args /*udata*/, nargs + 1 /*nargs*/, 1 /*nrets*/); +} + +DUK_EXTERNAL duk_int_t duk_safe_call(duk_hthread *thr, duk_safe_call_function func, void *udata, duk_idx_t nargs, duk_idx_t nrets) { + duk_int_t rc; + + DUK_ASSERT_API_ENTRY(thr); + + /* nargs condition; fail if: top - bottom < nargs + * <=> top < bottom + nargs + * nrets condition; fail if: end - (top - nargs) < nrets + * <=> end - top + nargs < nrets + * <=> end + nargs < top + nrets + */ + /* XXX: check for any reserve? */ + + if (DUK_UNLIKELY((nargs | nrets) < 0 || /* nargs < 0 || nrets < 0; OR sign bits */ + thr->valstack_top < thr->valstack_bottom + nargs || /* nargs too large compared to top */ + thr->valstack_end + nargs < thr->valstack_top + nrets)) { /* nrets too large compared to reserve */ + DUK_D(DUK_DPRINT("not enough stack reserve for safe call or invalid arguments: " + "nargs=%ld < 0 (?), nrets=%ld < 0 (?), top=%ld < bottom=%ld + nargs=%ld (?), " + "end=%ld + nargs=%ld < top=%ld + nrets=%ld (?)", + (long) nargs, + (long) nrets, + (long) (thr->valstack_top - thr->valstack), + (long) (thr->valstack_bottom - thr->valstack), + (long) nargs, + (long) (thr->valstack_end - thr->valstack), + (long) nargs, + (long) (thr->valstack_top - thr->valstack), + (long) nrets)); + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return DUK_EXEC_ERROR;); + } + + rc = duk_handle_safe_call(thr, /* thread */ + func, /* func */ + udata, /* udata */ + nargs, /* num_stack_args */ + nrets); /* num_stack_res */ + + return rc; +} + +DUK_EXTERNAL void duk_new(duk_hthread *thr, duk_idx_t nargs) { + duk_idx_t idx_func; + + DUK_ASSERT_API_ENTRY(thr); + + idx_func = duk__call_get_idx_func(thr, nargs, 1); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + + duk_push_object(thr); /* default instance; internal proto updated by call handling */ + duk_insert(thr, idx_func + 1); + + duk_handle_call_unprotected(thr, idx_func, DUK_CALL_FLAG_CONSTRUCT); +} + +DUK_LOCAL duk_ret_t duk__pnew_helper(duk_hthread *thr, void *udata) { + duk_idx_t nargs; + + DUK_ASSERT(udata != NULL); + nargs = *((duk_idx_t *) udata); + + duk_new(thr, nargs); + return 1; +} + +DUK_EXTERNAL duk_int_t duk_pnew(duk_hthread *thr, duk_idx_t nargs) { + duk_int_t rc; + + DUK_ASSERT_API_ENTRY(thr); + + /* For now, just use duk_safe_call() to wrap duk_new(). We can't + * simply use a protected duk_handle_call() because pushing the + * default instance might throw. + */ + + if (DUK_UNLIKELY(nargs < 0)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return DUK_EXEC_ERROR;); + } + + rc = duk_safe_call(thr, duk__pnew_helper, (void *) &nargs /*udata*/, nargs + 1 /*nargs*/, 1 /*nrets*/); + return rc; +} + +DUK_EXTERNAL duk_bool_t duk_is_constructor_call(duk_hthread *thr) { + duk_activation *act; + + DUK_ASSERT_API_ENTRY(thr); + + act = thr->callstack_curr; + if (act != NULL) { + return ((act->flags & DUK_ACT_FLAG_CONSTRUCT) != 0 ? 1 : 0); + } + return 0; +} + +/* XXX: Make this obsolete by adding a function flag for rejecting a + * non-constructor call automatically? + */ +DUK_INTERNAL void duk_require_constructor_call(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + if (!duk_is_constructor_call(thr)) { + DUK_ERROR_TYPE(thr, DUK_STR_CONSTRUCT_ONLY); + DUK_WO_NORETURN(return;); + } +} + +DUK_EXTERNAL duk_bool_t duk_is_strict_call(duk_hthread *thr) { + duk_activation *act; + + /* For user code this could just return 1 (strict) always + * because all Duktape/C functions are considered strict, + * and strict is also the default when nothing is running. + * However, Duktape may call this function internally when + * the current activation is an ECMAScript function, so + * this cannot be replaced by a 'return 1' without fixing + * the internal call sites. + */ + + DUK_ASSERT_API_ENTRY(thr); + + act = thr->callstack_curr; + if (act != NULL) { + return ((act->flags & DUK_ACT_FLAG_STRICT) != 0 ? 1 : 0); + } else { + /* Strict by default. */ + return 1; + } +} + +/* + * Duktape/C function magic + */ + +DUK_EXTERNAL duk_int_t duk_get_current_magic(duk_hthread *thr) { + duk_activation *act; + duk_hobject *func; + + DUK_ASSERT_API_ENTRY(thr); + + act = thr->callstack_curr; + if (act) { + func = DUK_ACT_GET_FUNC(act); + if (!func) { + duk_tval *tv = &act->tv_func; + duk_small_uint_t lf_flags; + lf_flags = DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv); + return (duk_int_t) DUK_LFUNC_FLAGS_GET_MAGIC(lf_flags); + } + DUK_ASSERT(func != NULL); + + if (DUK_HOBJECT_IS_NATFUNC(func)) { + duk_hnatfunc *nf = (duk_hnatfunc *) func; + return (duk_int_t) nf->magic; + } + } + return 0; +} + +DUK_EXTERNAL duk_int_t duk_get_magic(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + if (DUK_TVAL_IS_OBJECT(tv)) { + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (!DUK_HOBJECT_HAS_NATFUNC(h)) { + goto type_error; + } + return (duk_int_t) ((duk_hnatfunc *) h)->magic; + } else if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + duk_small_uint_t lf_flags = DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv); + return (duk_int_t) DUK_LFUNC_FLAGS_GET_MAGIC(lf_flags); + } + + /* fall through */ + type_error: + DUK_ERROR_TYPE(thr, DUK_STR_UNEXPECTED_TYPE); + DUK_WO_NORETURN(return 0;); +} + +DUK_EXTERNAL void duk_set_magic(duk_hthread *thr, duk_idx_t idx, duk_int_t magic) { + duk_hnatfunc *nf; + + DUK_ASSERT_API_ENTRY(thr); + + nf = duk_require_hnatfunc(thr, idx); + DUK_ASSERT(nf != NULL); + nf->magic = (duk_int16_t) magic; +} + +/* + * Misc helpers + */ + +/* Resolve a bound function on value stack top to a non-bound target + * (leave other values as is). + */ +DUK_INTERNAL void duk_resolve_nonbound_function(duk_hthread *thr) { + duk_tval *tv; + + DUK_ASSERT_HTHREAD_VALID(thr); + + tv = DUK_GET_TVAL_NEGIDX(thr, -1); + if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (DUK_HOBJECT_HAS_BOUNDFUNC(h)) { + duk_push_tval(thr, &((duk_hboundfunc *) (void *) h)->target); + duk_replace(thr, -2); +#if 0 + DUK_TVAL_SET_TVAL(tv, &((duk_hboundfunc *) h)->target); + DUK_TVAL_INCREF(thr, tv); + DUK_HOBJECT_DECREF_NORZ(thr, h); +#endif + /* Rely on Function.prototype.bind() on never creating a bound + * function whose target is not proper. This is now safe + * because the target is not even an internal property but a + * struct member. + */ + DUK_ASSERT(duk_is_lightfunc(thr, -1) || duk_is_callable(thr, -1)); + } + } + + /* Lightfuncs cannot be bound but are always callable and + * constructable. + */ +} +#line 1 "duk_api_codec.c" +/* + * Encoding and decoding basic formats: hex, base64. + * + * These are in-place operations which may allow an optimized implementation. + * + * Base-64: https://tools.ietf.org/html/rfc4648#section-4 + */ + +/* #include duk_internal.h -> already included */ + +/* + * Misc helpers + */ + +/* Shared handling for encode/decode argument. Fast path handling for + * buffer and string values because they're the most common. In particular, + * avoid creating a temporary string or buffer when possible. + */ +DUK_LOCAL const duk_uint8_t *duk__prep_codec_arg(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len) { + void *ptr; + duk_bool_t isbuffer; + + DUK_ASSERT(duk_is_valid_index(thr, idx)); /* checked by caller */ + + /* XXX: with def_ptr set to a stack related pointer, isbuffer could + * be removed from the helper? + */ + ptr = duk_get_buffer_data_raw(thr, idx, out_len, NULL /*def_ptr*/, 0 /*def_size*/, 0 /*throw_flag*/, &isbuffer); + if (isbuffer) { + DUK_ASSERT(*out_len == 0 || ptr != NULL); + return (const duk_uint8_t *) ptr; + } + return (const duk_uint8_t *) duk_to_lstring(thr, idx, out_len); +} + +/* + * Base64 + */ + +#if defined(DUK_USE_BASE64_SUPPORT) +/* Bytes emitted for number of padding characters in range [0,4]. */ +DUK_LOCAL const duk_int8_t duk__base64_decode_nequal_step[5] = { + 3, /* #### -> 24 bits, emit 3 bytes */ + 2, /* ###= -> 18 bits, emit 2 bytes */ + 1, /* ##== -> 12 bits, emit 1 byte */ + -1, /* #=== -> 6 bits, error */ + 0, /* ==== -> 0 bits, emit 0 bytes */ +}; + +#if defined(DUK_USE_BASE64_FASTPATH) +DUK_LOCAL const duk_uint8_t duk__base64_enctab_fast[64] = { + 0x41U, 0x42U, 0x43U, 0x44U, 0x45U, 0x46U, 0x47U, 0x48U, 0x49U, 0x4aU, 0x4bU, 0x4cU, 0x4dU, 0x4eU, 0x4fU, 0x50U, /* A...P */ + 0x51U, 0x52U, 0x53U, 0x54U, 0x55U, 0x56U, 0x57U, 0x58U, 0x59U, 0x5aU, 0x61U, 0x62U, 0x63U, 0x64U, 0x65U, 0x66U, /* Q...f */ + 0x67U, 0x68U, 0x69U, 0x6aU, 0x6bU, 0x6cU, 0x6dU, 0x6eU, 0x6fU, 0x70U, 0x71U, 0x72U, 0x73U, 0x74U, 0x75U, 0x76U, /* g...v */ + 0x77U, 0x78U, 0x79U, 0x7aU, 0x30U, 0x31U, 0x32U, 0x33U, 0x34U, 0x35U, 0x36U, 0x37U, 0x38U, 0x39U, 0x2bU, 0x2fU /* w.../ */ +}; +#endif /* DUK_USE_BASE64_FASTPATH */ + +#if defined(DUK_USE_BASE64_FASTPATH) +/* Decode table for one byte of input: + * -1 = allowed whitespace + * -2 = padding + * -3 = error + * 0...63 decoded bytes + */ +DUK_LOCAL const duk_int8_t duk__base64_dectab_fast[256] = { + -3, -3, -3, -3, -3, -3, -3, -3, -3, -1, -1, -3, -3, -1, -3, -3, /* 0x00...0x0f */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0x10...0x1f */ + -1, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, 62, -3, -3, -3, 63, /* 0x20...0x2f */ + 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -3, -3, -3, -2, -3, -3, /* 0x30...0x3f */ + -3, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 0x40...0x4f */ + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -3, -3, -3, -3, -3, /* 0x50...0x5f */ + -3, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, /* 0x60...0x6f */ + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -3, -3, -3, -3, -3, /* 0x70...0x7f */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0x80...0x8f */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0x90...0x9f */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0xa0...0xaf */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0xb0...0xbf */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0xc0...0xcf */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0xd0...0xdf */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, /* 0xe0...0xef */ + -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3 /* 0xf0...0xff */ +}; +#endif /* DUK_USE_BASE64_FASTPATH */ + +#if defined(DUK_USE_BASE64_FASTPATH) +DUK_LOCAL DUK_ALWAYS_INLINE void duk__base64_encode_fast_3(const duk_uint8_t *src, duk_uint8_t *dst) { + duk_uint_t t; + + t = (duk_uint_t) src[0]; + t = (t << 8) + (duk_uint_t) src[1]; + t = (t << 8) + (duk_uint_t) src[2]; + + dst[0] = duk__base64_enctab_fast[t >> 18]; + dst[1] = duk__base64_enctab_fast[(t >> 12) & 0x3fU]; + dst[2] = duk__base64_enctab_fast[(t >> 6) & 0x3fU]; + dst[3] = duk__base64_enctab_fast[t & 0x3fU]; + +#if 0 + /* Tested: not faster on x64, most likely due to aliasing between + * output and input index computation. + */ + /* aaaaaabb bbbbcccc ccdddddd */ + dst[0] = duk__base64_enctab_fast[(src[0] >> 2) & 0x3fU]; + dst[1] = duk__base64_enctab_fast[((src[0] << 4) & 0x30U) | ((src[1] >> 4) & 0x0fU)]; + dst[2] = duk__base64_enctab_fast[((src[1] << 2) & 0x3fU) | ((src[2] >> 6) & 0x03U)]; + dst[3] = duk__base64_enctab_fast[src[2] & 0x3fU]; +#endif +} + +DUK_LOCAL DUK_ALWAYS_INLINE void duk__base64_encode_fast_2(const duk_uint8_t *src, duk_uint8_t *dst) { + duk_uint_t t; + + t = (duk_uint_t) src[0]; + t = (t << 8) + (duk_uint_t) src[1]; + dst[0] = duk__base64_enctab_fast[t >> 10]; /* XXXXXX-- -------- */ + dst[1] = duk__base64_enctab_fast[(t >> 4) & 0x3fU]; /* ------XX XXXX---- */ + dst[2] = duk__base64_enctab_fast[(t << 2) & 0x3fU]; /* -------- ----XXXX */ + dst[3] = DUK_ASC_EQUALS; +} + +DUK_LOCAL DUK_ALWAYS_INLINE void duk__base64_encode_fast_1(const duk_uint8_t *src, duk_uint8_t *dst) { + duk_uint_t t; + + t = (duk_uint_t) src[0]; + dst[0] = duk__base64_enctab_fast[t >> 2]; /* XXXXXX-- */ + dst[1] = duk__base64_enctab_fast[(t << 4) & 0x3fU]; /* ------XX */ + dst[2] = DUK_ASC_EQUALS; + dst[3] = DUK_ASC_EQUALS; +} + +DUK_LOCAL void duk__base64_encode_helper(const duk_uint8_t *src, duk_size_t srclen, duk_uint8_t *dst) { + duk_size_t n; + const duk_uint8_t *p; + duk_uint8_t *q; + + n = srclen; + p = src; + q = dst; + + if (n >= 16U) { + /* Fast path, unrolled by 4, allows interleaving. Process + * 12-byte input chunks which encode to 16-char output chunks. + * Only enter when at least one block is emitted (avoids div+mul + * for short inputs too). + */ + const duk_uint8_t *p_end_fast; + + p_end_fast = p + ((n / 12U) * 12U); + DUK_ASSERT(p_end_fast >= p + 12); + do { + duk__base64_encode_fast_3(p, q); + duk__base64_encode_fast_3(p + 3, q + 4); + duk__base64_encode_fast_3(p + 6, q + 8); + duk__base64_encode_fast_3(p + 9, q + 12); + p += 12; + q += 16; + } while (DUK_LIKELY(p != p_end_fast)); + + DUK_ASSERT(src + srclen >= p); + n = (duk_size_t) (src + srclen - p); + DUK_ASSERT(n < 12U); + } + + /* Remainder. */ + while (n >= 3U) { + duk__base64_encode_fast_3(p, q); + p += 3; + q += 4; + n -= 3U; + } + DUK_ASSERT(n == 0U || n == 1U || n == 2U); + if (n == 1U) { + duk__base64_encode_fast_1(p, q); +#if 0 /* Unnecessary. */ + p += 1; + q += 4; + n -= 1U; +#endif + } else if (n == 2U) { + duk__base64_encode_fast_2(p, q); +#if 0 /* Unnecessary. */ + p += 2; + q += 4; + n -= 2U; +#endif + } else { + DUK_ASSERT(n == 0U); /* nothing to do */ + ; + } +} +#else /* DUK_USE_BASE64_FASTPATH */ +DUK_LOCAL void duk__base64_encode_helper(const duk_uint8_t *src, duk_size_t srclen, duk_uint8_t *dst) { + duk_small_uint_t i, npad; + duk_uint_t t, x, y; + const duk_uint8_t *p; + const duk_uint8_t *p_end; + duk_uint8_t *q; + + p = src; + p_end = src + srclen; + q = dst; + npad = 0U; + + while (p < p_end) { + /* Read 3 bytes into 't', padded by zero. */ + t = 0; + for (i = 0; i < 3; i++) { + t = t << 8; + if (p < p_end) { + t += (duk_uint_t) (*p++); + } else { + /* This only happens on the last loop and we're + * guaranteed to exit on the next loop. + */ + npad++; + } + } + DUK_ASSERT(npad <= 2U); + + /* Emit 4 encoded characters. If npad > 0, some of the + * chars will be incorrect (zero bits) but we fix up the + * padding after the loop. A straightforward 64-byte + * lookup would be faster and cleaner, but this is shorter. + */ + for (i = 0; i < 4; i++) { + x = ((t >> 18) & 0x3fU); + t = t << 6; + + if (x <= 51U) { + if (x <= 25) { + y = x + DUK_ASC_UC_A; + } else { + y = x - 26 + DUK_ASC_LC_A; + } + } else { + if (x <= 61U) { + y = x - 52 + DUK_ASC_0; + } else if (x == 62) { + y = DUK_ASC_PLUS; + } else { + DUK_ASSERT(x == 63); + y = DUK_ASC_SLASH; + } + } + + *q++ = (duk_uint8_t) y; + } + } + + /* Handle padding by rewriting 0-2 bogus characters at the end. + * + * Missing bytes npad base64 example + * 0 0 #### + * 1 1 ###= + * 2 2 ##== + */ + DUK_ASSERT(npad <= 2U); + while (npad > 0U) { + *(q - npad) = DUK_ASC_EQUALS; + npad--; + } +} +#endif /* DUK_USE_BASE64_FASTPATH */ + +#if defined(DUK_USE_BASE64_FASTPATH) +DUK_LOCAL duk_bool_t duk__base64_decode_helper(const duk_uint8_t *src, duk_size_t srclen, duk_uint8_t *dst, duk_uint8_t **out_dst_final) { + duk_int_t x; + duk_uint_t t; + duk_small_uint_t n_equal; + duk_int8_t step; + const duk_uint8_t *p; + const duk_uint8_t *p_end; + const duk_uint8_t *p_end_safe; + duk_uint8_t *q; + + p = src; + p_end = src + srclen; + p_end_safe = p_end - 8; /* If 'src <= src_end_safe', safe to read 8 bytes. */ + q = dst; + + /* Alternate between a fast path which processes clean groups with no + * padding or whitespace, and a slow path which processes one arbitrary + * group and then re-enters the fast path. This handles e.g. base64 + * with newlines reasonably well because the majority of a line is in + * the fast path. + */ + for (;;) { + /* Fast path, on each loop handle two 4-char input groups. + * If both are clean, emit 6 bytes and continue. If first + * is clean, emit 3 bytes and drop out; otherwise emit + * nothing and drop out. This approach could be extended to + * more groups per loop, but for inputs with e.g. periodic + * newlines (which are common) it might not be an improvement. + */ + while (DUK_LIKELY(p <= p_end_safe)) { + duk_int_t t1, t2; + + /* The lookup byte is intentionally sign extended to + * (at least) 32 bits and then ORed. This ensures + * that is at least 1 byte is negative, the highest + * bit of the accumulator will be set at the end and + * we don't need to check every byte. + * + * Read all input bytes first before writing output + * bytes to minimize aliasing. + */ + DUK_DDD(DUK_DDDPRINT("fast loop: p=%p, p_end_safe=%p, p_end=%p", + (const void *) p, (const void *) p_end_safe, (const void *) p_end)); + + t1 = (duk_int_t) duk__base64_dectab_fast[p[0]]; + t1 = (duk_int_t) ((duk_uint_t) t1 << 6) | (duk_int_t) duk__base64_dectab_fast[p[1]]; + t1 = (duk_int_t) ((duk_uint_t) t1 << 6) | (duk_int_t) duk__base64_dectab_fast[p[2]]; + t1 = (duk_int_t) ((duk_uint_t) t1 << 6) | (duk_int_t) duk__base64_dectab_fast[p[3]]; + + t2 = (duk_int_t) duk__base64_dectab_fast[p[4]]; + t2 = (duk_int_t) ((duk_uint_t) t2 << 6) | (duk_int_t) duk__base64_dectab_fast[p[5]]; + t2 = (duk_int_t) ((duk_uint_t) t2 << 6) | (duk_int_t) duk__base64_dectab_fast[p[6]]; + t2 = (duk_int_t) ((duk_uint_t) t2 << 6) | (duk_int_t) duk__base64_dectab_fast[p[7]]; + + q[0] = (duk_uint8_t) (((duk_uint_t) t1 >> 16) & 0xffU); + q[1] = (duk_uint8_t) (((duk_uint_t) t1 >> 8) & 0xffU); + q[2] = (duk_uint8_t) ((duk_uint_t) t1 & 0xffU); + + q[3] = (duk_uint8_t) (((duk_uint_t) t2 >> 16) & 0xffU); + q[4] = (duk_uint8_t) (((duk_uint_t) t2 >> 8) & 0xffU); + q[5] = (duk_uint8_t) ((duk_uint_t) t2 & 0xffU); + + /* Optimistic check using one branch. */ + if (DUK_LIKELY((t1 | t2) >= 0)) { + p += 8; + q += 6; + } else if (t1 >= 0) { + DUK_DDD(DUK_DDDPRINT("fast loop first group was clean, second was not, process one slow path group")); + DUK_ASSERT(t2 < 0); + p += 4; + q += 3; + break; + } else { + DUK_DDD(DUK_DDDPRINT("fast loop first group was not clean, second does not matter, process one slow path group")); + DUK_ASSERT(t1 < 0); + break; + } + } /* fast path */ + + /* Slow path step 1: try to scan a 4-character encoded group, + * end-of-input, or start-of-padding. We exit with: + * 1. n_chars == 4: full group, no padding, no end-of-input. + * 2. n_chars < 4: partial group (may also be 0), encountered + * padding or end of input. + * + * The accumulator is initialized to 1; this allows us to detect + * a full group by comparing >= 0x1000000 without an extra + * counter variable. + */ + t = 1UL; + for (;;) { + DUK_DDD(DUK_DDDPRINT("slow loop: p=%p, p_end=%p, t=%lu", + (const void *) p, (const void *) p_end, (unsigned long) t)); + + if (DUK_LIKELY(p < p_end)) { + x = duk__base64_dectab_fast[*p++]; + if (DUK_LIKELY(x >= 0)) { + DUK_ASSERT(x >= 0 && x <= 63); + t = (t << 6) + (duk_uint_t) x; + if (t >= 0x1000000UL) { + break; + } + } else if (x == -1) { + continue; /* allowed ascii whitespace */ + } else if (x == -2) { + p--; + break; /* start of padding */ + } else { + DUK_ASSERT(x == -3); + goto decode_error; + } + } else { + break; /* end of input */ + } + } /* slow path step 1 */ + + /* Complete the padding by simulating pad characters, + * regardless of actual input padding chars. + */ + n_equal = 0; + while (t < 0x1000000UL) { + t = (t << 6) + 0U; + n_equal++; + } + + /* Slow path step 2: deal with full/partial group, padding, + * etc. Note that for num chars in [0,3] we intentionally emit + * 3 bytes but don't step forward that much, buffer space is + * guaranteed in setup. + * + * num chars: + * 0 #### no output (= step 0) + * 1 #=== reject, 6 bits of data + * 2 ##== 12 bits of data, output 1 byte (= step 1) + * 3 ###= 18 bits of data, output 2 bytes (= step 2) + * 4 #### 24 bits of data, output 3 bytes (= step 3) + */ + q[0] = (duk_uint8_t) ((t >> 16) & 0xffU); + q[1] = (duk_uint8_t) ((t >> 8) & 0xffU); + q[2] = (duk_uint8_t) (t & 0xffU); + + DUK_ASSERT(n_equal <= 4); + step = duk__base64_decode_nequal_step[n_equal]; + if (DUK_UNLIKELY(step < 0)) { + goto decode_error; + } + q += step; + + /* Slow path step 3: read and ignore padding and whitespace + * until (a) next non-padding and non-whitespace character + * after which we resume the fast path, or (b) end of input. + * This allows us to accept missing, partial, full, and extra + * padding cases uniformly. We also support concatenated + * base-64 documents because we resume scanning afterwards. + * + * Note that to support concatenated documents well, the '=' + * padding found inside the input must also allow for 'extra' + * padding. For example, 'Zm===' decodes to 'f' and has one + * extra padding char. So, 'Zm===Zm' should decode 'ff', even + * though the standard break-up would be 'Zm==' + '=Zm' which + * doesn't make sense. + * + * We also accept prepended padding like '==Zm9', because it + * is equivalent to an empty document with extra padding ('==') + * followed by a valid document. + */ + + for (;;) { + if (DUK_UNLIKELY(p >= p_end)) { + goto done; + } + x = duk__base64_dectab_fast[*p++]; + if (x == -1 || x == -2) { + ; /* padding or whitespace, keep eating */ + } else { + p--; + break; /* backtrack and go back to fast path, even for -1 */ + } + } /* slow path step 3 */ + } /* outer fast+slow path loop */ + + done: + DUK_DDD(DUK_DDDPRINT("done; p=%p, p_end=%p", + (const void *) p, (const void *) p_end)); + + DUK_ASSERT(p == p_end); + + *out_dst_final = q; + return 1; + + decode_error: + return 0; +} +#else /* DUK_USE_BASE64_FASTPATH */ +DUK_LOCAL duk_bool_t duk__base64_decode_helper(const duk_uint8_t *src, duk_size_t srclen, duk_uint8_t *dst, duk_uint8_t **out_dst_final) { + duk_uint_t t, x; + duk_int_t y; + duk_int8_t step; + const duk_uint8_t *p; + const duk_uint8_t *p_end; + duk_uint8_t *q; + /* 0x09, 0x0a, or 0x0d */ + duk_uint32_t mask_white = (1U << 9) | (1U << 10) | (1U << 13); + + /* 't' tracks progress of the decoded group: + * + * t == 1 no valid chars yet + * t >= 0x40 1x6 = 6 bits shifted in + * t >= 0x1000 2x6 = 12 bits shifted in + * t >= 0x40000 3x6 = 18 bits shifted in + * t >= 0x1000000 4x6 = 24 bits shifted in + * + * By initializing t=1 there's no need for a separate counter for + * the number of characters found so far. + */ + p = src; + p_end = src + srclen; + q = dst; + t = 1UL; + + for (;;) { + duk_small_uint_t n_equal; + + DUK_ASSERT(t >= 1U); + if (p >= p_end) { + /* End of input: if input exists, treat like + * start of padding, finish the block, then + * re-enter here to see we're done. + */ + if (t == 1U) { + break; + } else { + goto simulate_padding; + } + } + + x = *p++; + + if (x >= 0x41U) { + /* Valid: a-z and A-Z. */ + DUK_ASSERT(x >= 0x41U && x <= 0xffU); + if (x >= 0x61U && x <= 0x7aU) { + y = (duk_int_t) x - 0x61 + 26; + } else if (x <= 0x5aU) { + y = (duk_int_t) x - 0x41; + } else { + goto decode_error; + } + } else if (x >= 0x30U) { + /* Valid: 0-9 and =. */ + DUK_ASSERT(x >= 0x30U && x <= 0x40U); + if (x <= 0x39U) { + y = (duk_int_t) x - 0x30 + 52; + } else if (x == 0x3dU) { + /* Skip padding and whitespace unless we're in the + * middle of a block. Otherwise complete group by + * simulating shifting in the correct padding. + */ + if (t == 1U) { + continue; + } + goto simulate_padding; + } else { + goto decode_error; + } + } else if (x >= 0x20U) { + /* Valid: +, /, and 0x20 whitespace. */ + DUK_ASSERT(x >= 0x20U && x <= 0x2fU); + if (x == 0x2bU) { + y = 62; + } else if (x == 0x2fU) { + y = 63; + } else if (x == 0x20U) { + continue; + } else { + goto decode_error; + } + } else { + /* Valid: whitespace. */ + duk_uint32_t m; + DUK_ASSERT(x < 0x20U); /* 0x00 to 0x1f */ + m = (1U << x); + if (mask_white & m) { + /* Allow basic ASCII whitespace. */ + continue; + } else { + goto decode_error; + } + } + + DUK_ASSERT(y >= 0 && y <= 63); + t = (t << 6) + (duk_uint_t) y; + if (t < 0x1000000UL) { + continue; + } + /* fall through; no padding will be added */ + + simulate_padding: + n_equal = 0; + while (t < 0x1000000UL) { + t = (t << 6) + 0U; + n_equal++; + } + + /* Output 3 bytes from 't' and advance as needed. */ + q[0] = (duk_uint8_t) ((t >> 16) & 0xffU); + q[1] = (duk_uint8_t) ((t >> 8) & 0xffU); + q[2] = (duk_uint8_t) (t & 0xffU); + + DUK_ASSERT(n_equal <= 4U); + step = duk__base64_decode_nequal_step[n_equal]; + if (step < 0) { + goto decode_error; + } + q += step; + + /* Re-enter loop. The actual padding characters are skipped + * by the main loop. This handles cases like missing, partial, + * full, and extra padding, and allows parsing of concatenated + * documents (with extra padding) like: Zm===Zm. Also extra + * prepended padding is accepted: ===Zm9v. + */ + t = 1U; + } + DUK_ASSERT(t == 1UL); + + *out_dst_final = q; + return 1; + + decode_error: + return 0; +} +#endif /* DUK_USE_BASE64_FASTPATH */ + +DUK_EXTERNAL const char *duk_base64_encode(duk_hthread *thr, duk_idx_t idx) { + const duk_uint8_t *src; + duk_size_t srclen; + duk_size_t dstlen; + duk_uint8_t *dst; + const char *ret; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + src = duk__prep_codec_arg(thr, idx, &srclen); + /* Note: for srclen=0, src may be NULL */ + + /* Compute exact output length. Computation must not wrap; this + * limit works for 32-bit size_t: + * >>> srclen = 3221225469 + * >>> '%x' % ((srclen + 2) / 3 * 4) + * 'fffffffc' + */ + if (srclen > 3221225469UL) { + goto type_error; + } + dstlen = (srclen + 2U) / 3U * 4U; + dst = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, dstlen); + + duk__base64_encode_helper((const duk_uint8_t *) src, srclen, dst); + + ret = duk_buffer_to_string(thr, -1); /* Safe, result is ASCII. */ + duk_replace(thr, idx); + return ret; + + type_error: + DUK_ERROR_TYPE(thr, DUK_STR_BASE64_ENCODE_FAILED); + DUK_WO_NORETURN(return NULL;); +} + +DUK_EXTERNAL void duk_base64_decode(duk_hthread *thr, duk_idx_t idx) { + const duk_uint8_t *src; + duk_size_t srclen; + duk_size_t dstlen; + duk_uint8_t *dst; + duk_uint8_t *dst_final; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + src = duk__prep_codec_arg(thr, idx, &srclen); + + /* Round up and add safety margin. Avoid addition before division to + * avoid possibility of wrapping. Margin includes +3 for rounding up, + * and +3 for one extra group: the decoder may emit and then backtrack + * a full group (3 bytes) from zero-sized input for technical reasons. + * Similarly, 'xx' may ecause 1+3 = bytes to be emitted and then + * backtracked. + */ + dstlen = (srclen / 4) * 3 + 6; /* upper limit, assuming no whitespace etc */ + dst = (duk_uint8_t *) duk_push_dynamic_buffer(thr, dstlen); + /* Note: for dstlen=0, dst may be NULL */ + + if (!duk__base64_decode_helper((const duk_uint8_t *) src, srclen, dst, &dst_final)) { + goto type_error; + } + + /* XXX: convert to fixed buffer? */ + (void) duk_resize_buffer(thr, -1, (duk_size_t) (dst_final - dst)); + duk_replace(thr, idx); + return; + + type_error: + DUK_ERROR_TYPE(thr, DUK_STR_BASE64_DECODE_FAILED); + DUK_WO_NORETURN(return;); +} +#else /* DUK_USE_BASE64_SUPPORT */ +DUK_EXTERNAL const char *duk_base64_encode(duk_hthread *thr, duk_idx_t idx) { + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_base64_decode(duk_hthread *thr, duk_idx_t idx) { + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_BASE64_SUPPORT */ + +/* + * Hex + */ + +#if defined(DUK_USE_HEX_SUPPORT) +DUK_EXTERNAL const char *duk_hex_encode(duk_hthread *thr, duk_idx_t idx) { + const duk_uint8_t *inp; + duk_size_t len; + duk_size_t i; + duk_uint8_t *buf; + const char *ret; +#if defined(DUK_USE_HEX_FASTPATH) + duk_size_t len_safe; + duk_uint16_t *p16; +#endif + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + inp = duk__prep_codec_arg(thr, idx, &len); + DUK_ASSERT(inp != NULL || len == 0); + + /* Fixed buffer, no zeroing because we'll fill all the data. */ + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, len * 2); + DUK_ASSERT(buf != NULL); + +#if defined(DUK_USE_HEX_FASTPATH) + DUK_ASSERT((((duk_size_t) buf) & 0x01U) == 0); /* pointer is aligned, guaranteed for fixed buffer */ + p16 = (duk_uint16_t *) (void *) buf; + len_safe = len & ~0x03U; + for (i = 0; i < len_safe; i += 4) { + p16[0] = duk_hex_enctab[inp[i]]; + p16[1] = duk_hex_enctab[inp[i + 1]]; + p16[2] = duk_hex_enctab[inp[i + 2]]; + p16[3] = duk_hex_enctab[inp[i + 3]]; + p16 += 4; + } + for (; i < len; i++) { + *p16++ = duk_hex_enctab[inp[i]]; + } +#else /* DUK_USE_HEX_FASTPATH */ + for (i = 0; i < len; i++) { + duk_small_uint_t t; + t = (duk_small_uint_t) inp[i]; + buf[i*2 + 0] = duk_lc_digits[t >> 4]; + buf[i*2 + 1] = duk_lc_digits[t & 0x0f]; + } +#endif /* DUK_USE_HEX_FASTPATH */ + + /* XXX: Using a string return value forces a string intern which is + * not always necessary. As a rough performance measure, hex encode + * time for tests/perf/test-hex-encode.js dropped from ~35s to ~15s + * without string coercion. Change to returning a buffer and let the + * caller coerce to string if necessary? + */ + + ret = duk_buffer_to_string(thr, -1); /* Safe, result is ASCII. */ + duk_replace(thr, idx); + return ret; +} + +DUK_EXTERNAL void duk_hex_decode(duk_hthread *thr, duk_idx_t idx) { + const duk_uint8_t *inp; + duk_size_t len; + duk_size_t i; + duk_int_t t; + duk_uint8_t *buf; +#if defined(DUK_USE_HEX_FASTPATH) + duk_int_t chk; + duk_uint8_t *p; + duk_size_t len_safe; +#endif + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + inp = duk__prep_codec_arg(thr, idx, &len); + DUK_ASSERT(inp != NULL || len == 0); + + if (len & 0x01) { + goto type_error; + } + + /* Fixed buffer, no zeroing because we'll fill all the data. */ + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, len / 2); + DUK_ASSERT(buf != NULL); + +#if defined(DUK_USE_HEX_FASTPATH) + p = buf; + len_safe = len & ~0x07U; + for (i = 0; i < len_safe; i += 8) { + t = ((duk_int_t) duk_hex_dectab_shift4[inp[i]]) | + ((duk_int_t) duk_hex_dectab[inp[i + 1]]); + chk = t; + p[0] = (duk_uint8_t) t; + t = ((duk_int_t) duk_hex_dectab_shift4[inp[i + 2]]) | + ((duk_int_t) duk_hex_dectab[inp[i + 3]]); + chk |= t; + p[1] = (duk_uint8_t) t; + t = ((duk_int_t) duk_hex_dectab_shift4[inp[i + 4]]) | + ((duk_int_t) duk_hex_dectab[inp[i + 5]]); + chk |= t; + p[2] = (duk_uint8_t) t; + t = ((duk_int_t) duk_hex_dectab_shift4[inp[i + 6]]) | + ((duk_int_t) duk_hex_dectab[inp[i + 7]]); + chk |= t; + p[3] = (duk_uint8_t) t; + p += 4; + + /* Check if any lookup above had a negative result. */ + if (DUK_UNLIKELY(chk < 0)) { + goto type_error; + } + } + for (; i < len; i += 2) { + /* First cast to duk_int_t to sign extend, second cast to + * duk_uint_t to avoid signed left shift, and final cast to + * duk_int_t result type. + */ + t = (duk_int_t) ((((duk_uint_t) (duk_int_t) duk_hex_dectab[inp[i]]) << 4U) | + ((duk_uint_t) (duk_int_t) duk_hex_dectab[inp[i + 1]])); + if (DUK_UNLIKELY(t < 0)) { + goto type_error; + } + *p++ = (duk_uint8_t) t; + } +#else /* DUK_USE_HEX_FASTPATH */ + for (i = 0; i < len; i += 2) { + /* For invalid characters the value -1 gets extended to + * at least 16 bits. If either nybble is invalid, the + * resulting 't' will be < 0. + */ + t = (duk_int_t) ((((duk_uint_t) (duk_int_t) duk_hex_dectab[inp[i]]) << 4U) | + ((duk_uint_t) (duk_int_t) duk_hex_dectab[inp[i + 1]])); + if (DUK_UNLIKELY(t < 0)) { + goto type_error; + } + buf[i >> 1] = (duk_uint8_t) t; + } +#endif /* DUK_USE_HEX_FASTPATH */ + + duk_replace(thr, idx); + return; + + type_error: + DUK_ERROR_TYPE(thr, DUK_STR_HEX_DECODE_FAILED); + DUK_WO_NORETURN(return;); +} +#else /* DUK_USE_HEX_SUPPORT */ +DUK_EXTERNAL const char *duk_hex_encode(duk_hthread *thr, duk_idx_t idx) { + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +DUK_EXTERNAL void duk_hex_decode(duk_hthread *thr, duk_idx_t idx) { + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_HEX_SUPPORT */ + +/* + * JSON + */ + +#if defined(DUK_USE_JSON_SUPPORT) +DUK_EXTERNAL const char *duk_json_encode(duk_hthread *thr, duk_idx_t idx) { +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t top_at_entry; +#endif + const char *ret; + + DUK_ASSERT_API_ENTRY(thr); +#if defined(DUK_USE_ASSERTIONS) + top_at_entry = duk_get_top(thr); +#endif + + idx = duk_require_normalize_index(thr, idx); + duk_bi_json_stringify_helper(thr, + idx /*idx_value*/, + DUK_INVALID_INDEX /*idx_replacer*/, + DUK_INVALID_INDEX /*idx_space*/, + 0 /*flags*/); + DUK_ASSERT(duk_is_string(thr, -1)); + duk_replace(thr, idx); + ret = duk_get_string(thr, idx); + + DUK_ASSERT(duk_get_top(thr) == top_at_entry); + + return ret; +} + +DUK_EXTERNAL void duk_json_decode(duk_hthread *thr, duk_idx_t idx) { +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t top_at_entry; +#endif + + DUK_ASSERT_API_ENTRY(thr); +#if defined(DUK_USE_ASSERTIONS) + top_at_entry = duk_get_top(thr); +#endif + + idx = duk_require_normalize_index(thr, idx); + duk_bi_json_parse_helper(thr, + idx /*idx_value*/, + DUK_INVALID_INDEX /*idx_reviver*/, + 0 /*flags*/); + duk_replace(thr, idx); + + DUK_ASSERT(duk_get_top(thr) == top_at_entry); +} +#else /* DUK_USE_JSON_SUPPORT */ +DUK_EXTERNAL const char *duk_json_encode(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return NULL;); +} + +DUK_EXTERNAL void duk_json_decode(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_JSON_SUPPORT */ +#line 1 "duk_api_compile.c" +/* + * Compilation and evaluation + */ + +/* #include duk_internal.h -> already included */ + +typedef struct duk__compile_raw_args duk__compile_raw_args; +struct duk__compile_raw_args { + duk_size_t src_length; /* should be first on 64-bit platforms */ + const duk_uint8_t *src_buffer; + duk_uint_t flags; +}; + +/* Eval is just a wrapper now. */ +DUK_EXTERNAL duk_int_t duk_eval_raw(duk_hthread *thr, const char *src_buffer, duk_size_t src_length, duk_uint_t flags) { + duk_int_t rc; + + DUK_ASSERT_API_ENTRY(thr); + + /* Note: strictness is *not* inherited from the current Duktape/C. + * This would be confusing because the current strictness state + * depends on whether we're running inside a Duktape/C activation + * (= strict mode) or outside of any activation (= non-strict mode). + * See tests/api/test-eval-strictness.c for more discussion. + */ + + /* [ ... source? filename? ] (depends on flags) */ + + rc = duk_compile_raw(thr, src_buffer, src_length, flags | DUK_COMPILE_EVAL); /* may be safe, or non-safe depending on flags */ + + /* [ ... closure/error ] */ + + if (rc != DUK_EXEC_SUCCESS) { + rc = DUK_EXEC_ERROR; + goto got_rc; + } + + duk_push_global_object(thr); /* explicit 'this' binding, see GH-164 */ + + if (flags & DUK_COMPILE_SAFE) { + rc = duk_pcall_method(thr, 0); + } else { + duk_call_method(thr, 0); + rc = DUK_EXEC_SUCCESS; + } + + /* [ ... result/error ] */ + + got_rc: + if (flags & DUK_COMPILE_NORESULT) { + duk_pop(thr); + } + + return rc; +} + +/* Helper which can be called both directly and with duk_safe_call(). */ +DUK_LOCAL duk_ret_t duk__do_compile(duk_hthread *thr, void *udata) { + duk__compile_raw_args *comp_args; + duk_uint_t flags; + duk_hcompfunc *h_templ; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(udata != NULL); + + /* Note: strictness is not inherited from the current Duktape/C + * context. Otherwise it would not be possible to compile + * non-strict code inside a Duktape/C activation (which is + * always strict now). See tests/api/test-eval-strictness.c + * for discussion. + */ + + /* [ ... source? filename? ] (depends on flags) */ + + comp_args = (duk__compile_raw_args *) udata; + flags = comp_args->flags; + + if (flags & DUK_COMPILE_NOFILENAME) { + /* Automatic filename: 'eval' or 'input'. */ + duk_push_hstring_stridx(thr, (flags & DUK_COMPILE_EVAL) ? DUK_STRIDX_EVAL : DUK_STRIDX_INPUT); + } + + /* [ ... source? filename ] */ + + if (!comp_args->src_buffer) { + duk_hstring *h_sourcecode; + + h_sourcecode = duk_get_hstring(thr, -2); + if ((flags & DUK_COMPILE_NOSOURCE) || /* args incorrect */ + (h_sourcecode == NULL)) { /* e.g. duk_push_string_file_raw() pushed undefined */ + DUK_ERROR_TYPE(thr, DUK_STR_NO_SOURCECODE); + DUK_WO_NORETURN(return 0;); + } + DUK_ASSERT(h_sourcecode != NULL); + comp_args->src_buffer = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_sourcecode); + comp_args->src_length = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h_sourcecode); + } + DUK_ASSERT(comp_args->src_buffer != NULL); + + if (flags & DUK_COMPILE_FUNCTION) { + flags |= DUK_COMPILE_EVAL | DUK_COMPILE_FUNCEXPR; + } + + /* [ ... source? filename ] */ + + duk_js_compile(thr, comp_args->src_buffer, comp_args->src_length, flags); + + /* [ ... source? func_template ] */ + + if (flags & DUK_COMPILE_NOSOURCE) { + ; + } else { + duk_remove_m2(thr); + } + + /* [ ... func_template ] */ + + h_templ = (duk_hcompfunc *) duk_known_hobject(thr, -1); + duk_js_push_closure(thr, + h_templ, + thr->builtins[DUK_BIDX_GLOBAL_ENV], + thr->builtins[DUK_BIDX_GLOBAL_ENV], + 1 /*add_auto_proto*/); + duk_remove_m2(thr); /* -> [ ... closure ] */ + + /* [ ... closure ] */ + + return 1; +} + +DUK_EXTERNAL duk_int_t duk_compile_raw(duk_hthread *thr, const char *src_buffer, duk_size_t src_length, duk_uint_t flags) { + duk__compile_raw_args comp_args_alloc; + duk__compile_raw_args *comp_args = &comp_args_alloc; + + DUK_ASSERT_API_ENTRY(thr); + + if ((flags & DUK_COMPILE_STRLEN) && (src_buffer != NULL)) { + /* String length is computed here to avoid multiple evaluation + * of a macro argument in the calling side. + */ + src_length = DUK_STRLEN(src_buffer); + } + + comp_args->src_buffer = (const duk_uint8_t *) src_buffer; + comp_args->src_length = src_length; + comp_args->flags = flags; + + /* [ ... source? filename? ] (depends on flags) */ + + if (flags & DUK_COMPILE_SAFE) { + duk_int_t rc; + duk_int_t nargs; + duk_int_t nrets = 1; + + /* Arguments can be: [ source? filename? &comp_args] so that + * nargs is 1 to 3. Call site encodes the correct nargs count + * directly into flags. + */ + nargs = flags & 0x07; + DUK_ASSERT(nargs == ((flags & DUK_COMPILE_NOSOURCE) ? 0 : 1) + + ((flags & DUK_COMPILE_NOFILENAME) ? 0 : 1)); + rc = duk_safe_call(thr, duk__do_compile, (void *) comp_args, nargs, nrets); + + /* [ ... closure ] */ + return rc; + } + + (void) duk__do_compile(thr, (void *) comp_args); + + /* [ ... closure ] */ + return DUK_EXEC_SUCCESS; +} +#line 1 "duk_api_debug.c" +/* + * Debugging related API calls + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_JSON_SUPPORT) +DUK_EXTERNAL void duk_push_context_dump(duk_hthread *thr) { + duk_idx_t idx; + duk_idx_t top; + + DUK_ASSERT_API_ENTRY(thr); + + /* We don't duk_require_stack() here now, but rely on the caller having + * enough space. + */ + + top = duk_get_top(thr); + duk_push_array(thr); + for (idx = 0; idx < top; idx++) { + duk_dup(thr, idx); + duk_put_prop_index(thr, -2, (duk_uarridx_t) idx); + } + + /* XXX: conversion errors should not propagate outwards. + * Perhaps values need to be coerced individually? + */ + duk_bi_json_stringify_helper(thr, + duk_get_top_index(thr), /*idx_value*/ + DUK_INVALID_INDEX, /*idx_replacer*/ + DUK_INVALID_INDEX, /*idx_space*/ + DUK_JSON_FLAG_EXT_CUSTOM | + DUK_JSON_FLAG_ASCII_ONLY | + DUK_JSON_FLAG_AVOID_KEY_QUOTES /*flags*/); + + duk_push_sprintf(thr, "ctx: top=%ld, stack=%s", (long) top, (const char *) duk_safe_to_string(thr, -1)); + duk_replace(thr, -3); /* [ ... arr jsonx(arr) res ] -> [ ... res jsonx(arr) ] */ + duk_pop(thr); + DUK_ASSERT(duk_is_string(thr, -1)); +} +#else /* DUK_USE_JSON_SUPPORT */ +DUK_EXTERNAL void duk_push_context_dump(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_JSON_SUPPORT */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + +DUK_EXTERNAL void duk_debugger_attach(duk_hthread *thr, + duk_debug_read_function read_cb, + duk_debug_write_function write_cb, + duk_debug_peek_function peek_cb, + duk_debug_read_flush_function read_flush_cb, + duk_debug_write_flush_function write_flush_cb, + duk_debug_request_function request_cb, + duk_debug_detached_function detached_cb, + void *udata) { + duk_heap *heap; + const char *str; + duk_size_t len; + + /* XXX: should there be an error or an automatic detach if + * already attached? + */ + + DUK_D(DUK_DPRINT("application called duk_debugger_attach()")); + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(read_cb != NULL); + DUK_ASSERT(write_cb != NULL); + /* Other callbacks are optional. */ + + heap = thr->heap; + heap->dbg_read_cb = read_cb; + heap->dbg_write_cb = write_cb; + heap->dbg_peek_cb = peek_cb; + heap->dbg_read_flush_cb = read_flush_cb; + heap->dbg_write_flush_cb = write_flush_cb; + heap->dbg_request_cb = request_cb; + heap->dbg_detached_cb = detached_cb; + heap->dbg_udata = udata; + heap->dbg_have_next_byte = 0; + + /* Start in paused state. */ + heap->dbg_processing = 0; + heap->dbg_state_dirty = 0; + heap->dbg_force_restart = 0; + heap->dbg_pause_flags = 0; + heap->dbg_pause_act = NULL; + heap->dbg_pause_startline = 0; + heap->dbg_exec_counter = 0; + heap->dbg_last_counter = 0; + heap->dbg_last_time = 0.0; + duk_debug_set_paused(heap); /* XXX: overlap with fields above */ + + /* Send version identification and flush right afterwards. Note that + * we must write raw, unframed bytes here. + */ + duk_push_sprintf(thr, "%ld %ld %s %s\n", + (long) DUK_DEBUG_PROTOCOL_VERSION, + (long) DUK_VERSION, + (const char *) DUK_GIT_DESCRIBE, + (const char *) DUK_USE_TARGET_INFO); + str = duk_get_lstring(thr, -1, &len); + DUK_ASSERT(str != NULL); + duk_debug_write_bytes(thr, (const duk_uint8_t *) str, len); + duk_debug_write_flush(thr); + duk_pop(thr); +} + +DUK_EXTERNAL void duk_debugger_detach(duk_hthread *thr) { + DUK_D(DUK_DPRINT("application called duk_debugger_detach()")); + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->heap != NULL); + + /* Can be called multiple times with no harm. */ + duk_debug_do_detach(thr->heap); +} + +DUK_EXTERNAL void duk_debugger_cooperate(duk_hthread *thr) { + duk_bool_t processed_messages; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->heap != NULL); + + if (!duk_debug_is_attached(thr->heap)) { + return; + } + if (thr->callstack_curr != NULL || thr->heap->dbg_processing) { + /* Calling duk_debugger_cooperate() while Duktape is being + * called into is not supported. This is not a 100% check + * but prevents any damage in most cases. + */ + return; + } + + processed_messages = duk_debug_process_messages(thr, 1 /*no_block*/); + DUK_UNREF(processed_messages); +} + +DUK_EXTERNAL duk_bool_t duk_debugger_notify(duk_hthread *thr, duk_idx_t nvalues) { + duk_idx_t top; + duk_idx_t idx; + duk_bool_t ret = 0; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->heap != NULL); + + DUK_D(DUK_DPRINT("application called duk_debugger_notify() with nvalues=%ld", (long) nvalues)); + + top = duk_get_top(thr); + if (top < nvalues) { + DUK_ERROR_RANGE(thr, "not enough stack values for notify"); + DUK_WO_NORETURN(return 0;); + } + if (duk_debug_is_attached(thr->heap)) { + duk_debug_write_notify(thr, DUK_DBG_CMD_APPNOTIFY); + for (idx = top - nvalues; idx < top; idx++) { + duk_tval *tv = DUK_GET_TVAL_POSIDX(thr, idx); + duk_debug_write_tval(thr, tv); + } + duk_debug_write_eom(thr); + + /* Return non-zero (true) if we have a good reason to believe + * the notify was delivered; if we're still attached at least + * a transport error was not indicated by the transport write + * callback. This is not a 100% guarantee of course. + */ + if (duk_debug_is_attached(thr->heap)) { + ret = 1; + } + } + duk_pop_n(thr, nvalues); + return ret; +} + +DUK_EXTERNAL void duk_debugger_pause(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->heap != NULL); + + DUK_D(DUK_DPRINT("application called duk_debugger_pause()")); + + /* Treat like a debugger statement: ignore when not attached. */ + if (duk_debug_is_attached(thr->heap)) { + if (duk_debug_is_paused(thr->heap)) { + DUK_D(DUK_DPRINT("duk_debugger_pause() called when already paused; ignoring")); + } else { + duk_debug_set_paused(thr->heap); + + /* Pause on the next opcode executed. This is always safe to do even + * inside the debugger message loop: the interrupt counter will be reset + * to its proper value when the message loop exits. + */ + thr->interrupt_init = 1; + thr->interrupt_counter = 0; + } + } +} + +#else /* DUK_USE_DEBUGGER_SUPPORT */ + +DUK_EXTERNAL void duk_debugger_attach(duk_hthread *thr, + duk_debug_read_function read_cb, + duk_debug_write_function write_cb, + duk_debug_peek_function peek_cb, + duk_debug_read_flush_function read_flush_cb, + duk_debug_write_flush_function write_flush_cb, + duk_debug_request_function request_cb, + duk_debug_detached_function detached_cb, + void *udata) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(read_cb); + DUK_UNREF(write_cb); + DUK_UNREF(peek_cb); + DUK_UNREF(read_flush_cb); + DUK_UNREF(write_flush_cb); + DUK_UNREF(request_cb); + DUK_UNREF(detached_cb); + DUK_UNREF(udata); + DUK_ERROR_TYPE(thr, "no debugger support"); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_debugger_detach(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ERROR_TYPE(thr, "no debugger support"); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_debugger_cooperate(duk_hthread *thr) { + /* nop */ + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(thr); +} + +DUK_EXTERNAL duk_bool_t duk_debugger_notify(duk_hthread *thr, duk_idx_t nvalues) { + duk_idx_t top; + + DUK_ASSERT_API_ENTRY(thr); + + top = duk_get_top(thr); + if (top < nvalues) { + DUK_ERROR_RANGE_INVALID_COUNT(thr); + DUK_WO_NORETURN(return 0;); + } + + /* No debugger support, just pop values. */ + duk_pop_n(thr, nvalues); + return 0; +} + +DUK_EXTERNAL void duk_debugger_pause(duk_hthread *thr) { + /* Treat like debugger statement: nop */ + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(thr); +} + +#endif /* DUK_USE_DEBUGGER_SUPPORT */ +#line 1 "duk_api_heap.c" +/* + * Heap creation and destruction + */ + +/* #include duk_internal.h -> already included */ + +typedef struct duk_internal_thread_state duk_internal_thread_state; + +struct duk_internal_thread_state { + duk_ljstate lj; + duk_bool_t creating_error; + duk_hthread *curr_thread; + duk_int_t call_recursion_depth; +}; + +DUK_EXTERNAL duk_hthread *duk_create_heap(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *heap_udata, + duk_fatal_function fatal_handler) { + duk_heap *heap = NULL; + duk_hthread *thr; + + /* Assume that either all memory funcs are NULL or non-NULL, mixed + * cases will now be unsafe. + */ + + /* XXX: just assert non-NULL values here and make caller arguments + * do the defaulting to the default implementations (smaller code)? + */ + + if (!alloc_func) { + DUK_ASSERT(realloc_func == NULL); + DUK_ASSERT(free_func == NULL); +#if defined(DUK_USE_PROVIDE_DEFAULT_ALLOC_FUNCTIONS) + alloc_func = duk_default_alloc_function; + realloc_func = duk_default_realloc_function; + free_func = duk_default_free_function; +#else + DUK_D(DUK_DPRINT("no allocation functions given and no default providers")); + return NULL; +#endif + } else { + DUK_ASSERT(realloc_func != NULL); + DUK_ASSERT(free_func != NULL); + } + + if (!fatal_handler) { + fatal_handler = duk_default_fatal_handler; + } + + DUK_ASSERT(alloc_func != NULL); + DUK_ASSERT(realloc_func != NULL); + DUK_ASSERT(free_func != NULL); + DUK_ASSERT(fatal_handler != NULL); + + heap = duk_heap_alloc(alloc_func, realloc_func, free_func, heap_udata, fatal_handler); + if (!heap) { + return NULL; + } + thr = heap->heap_thread; + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + return thr; +} + +DUK_EXTERNAL void duk_destroy_heap(duk_hthread *thr) { + duk_heap *heap; + + if (!thr) { + return; + } + DUK_ASSERT_API_ENTRY(thr); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + duk_heap_free(heap); +} + +DUK_EXTERNAL void duk_suspend(duk_hthread *thr, duk_thread_state *state) { + duk_internal_thread_state *snapshot = (duk_internal_thread_state *) (void *) state; + duk_heap *heap; + duk_ljstate *lj; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(state != NULL); /* unvalidated */ + + /* Currently not supported when called from within a finalizer. + * If that is done, the finalizer will remain running indefinitely, + * preventing other finalizers from executing. The assert is a bit + * wider, checking that it would be OK to run pending finalizers. + */ + DUK_ASSERT(thr->heap->pf_prevent_count == 0); + + /* Currently not supported to duk_suspend() from an errCreate() + * call. + */ + DUK_ASSERT(thr->heap->creating_error == 0); + + heap = thr->heap; + lj = &heap->lj; + + duk_push_tval(thr, &lj->value1); + duk_push_tval(thr, &lj->value2); + + /* XXX: creating_error == 0 is asserted above, so no need to store. */ + duk_memcpy((void *) &snapshot->lj, (const void *) lj, sizeof(duk_ljstate)); + snapshot->creating_error = heap->creating_error; + snapshot->curr_thread = heap->curr_thread; + snapshot->call_recursion_depth = heap->call_recursion_depth; + + lj->jmpbuf_ptr = NULL; + lj->type = DUK_LJ_TYPE_UNKNOWN; + DUK_TVAL_SET_UNDEFINED(&lj->value1); + DUK_TVAL_SET_UNDEFINED(&lj->value2); + heap->creating_error = 0; + heap->curr_thread = NULL; + heap->call_recursion_depth = 0; +} + +DUK_EXTERNAL void duk_resume(duk_hthread *thr, const duk_thread_state *state) { + const duk_internal_thread_state *snapshot = (const duk_internal_thread_state *) (const void *) state; + duk_heap *heap; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(state != NULL); /* unvalidated */ + + /* Shouldn't be necessary if duk_suspend() is called before + * duk_resume(), but assert in case API sequence is incorrect. + */ + DUK_ASSERT(thr->heap->pf_prevent_count == 0); + DUK_ASSERT(thr->heap->creating_error == 0); + + heap = thr->heap; + + duk_memcpy((void *) &heap->lj, (const void *) &snapshot->lj, sizeof(duk_ljstate)); + heap->creating_error = snapshot->creating_error; + heap->curr_thread = snapshot->curr_thread; + heap->call_recursion_depth = snapshot->call_recursion_depth; + + duk_pop_2(thr); +} + +/* XXX: better place for this */ +DUK_EXTERNAL void duk_set_global_object(duk_hthread *thr) { + duk_hobject *h_glob; + duk_hobject *h_prev_glob; + duk_hobjenv *h_env; + duk_hobject *h_prev_env; + + DUK_ASSERT_API_ENTRY(thr); + + DUK_D(DUK_DPRINT("replace global object with: %!T", duk_get_tval(thr, -1))); + + h_glob = duk_require_hobject(thr, -1); + DUK_ASSERT(h_glob != NULL); + + /* + * Replace global object. + */ + + h_prev_glob = thr->builtins[DUK_BIDX_GLOBAL]; + DUK_UNREF(h_prev_glob); + thr->builtins[DUK_BIDX_GLOBAL] = h_glob; + DUK_HOBJECT_INCREF(thr, h_glob); + DUK_HOBJECT_DECREF_ALLOWNULL(thr, h_prev_glob); /* side effects, in theory (referenced by global env) */ + + /* + * Replace lexical environment for global scope + * + * Create a new object environment for the global lexical scope. + * We can't just reset the _Target property of the current one, + * because the lexical scope is shared by other threads with the + * same (initial) built-ins. + */ + + h_env = duk_hobjenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJENV)); + DUK_ASSERT(h_env != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_env) == NULL); + + DUK_ASSERT(h_env->target == NULL); + DUK_ASSERT(h_glob != NULL); + h_env->target = h_glob; + DUK_HOBJECT_INCREF(thr, h_glob); + DUK_ASSERT(h_env->has_this == 0); + + /* [ ... new_glob ] */ + + h_prev_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + thr->builtins[DUK_BIDX_GLOBAL_ENV] = (duk_hobject *) h_env; + DUK_HOBJECT_INCREF(thr, (duk_hobject *) h_env); + DUK_HOBJECT_DECREF_ALLOWNULL(thr, h_prev_env); /* side effects */ + DUK_UNREF(h_env); /* without refcounts */ + DUK_UNREF(h_prev_env); + + /* [ ... new_glob ] */ + + duk_pop(thr); + + /* [ ... ] */ +} +#line 1 "duk_api_inspect.c" +/* + * Inspection + */ + +/* #include duk_internal.h -> already included */ + +/* For footprint efficient multiple value setting: arrays are much better than + * varargs, format string with parsing is often better than string pointer arrays. + */ +DUK_LOCAL void duk__inspect_multiple_uint(duk_hthread *thr, const char *fmt, duk_int_t *vals) { + duk_int_t val; + const char *p; + const char *p_curr; + duk_size_t len; + + for (p = fmt;;) { + len = DUK_STRLEN(p); + p_curr = p; + p += len + 1; + if (len == 0) { + /* Double NUL (= empty key) terminates. */ + break; + } + val = *vals++; + if (val >= 0) { + /* Negative values are markers to skip key. */ + duk_push_string(thr, p_curr); + duk_push_int(thr, val); + duk_put_prop(thr, -3); + } + } +} + +/* Raw helper to extract internal information / statistics about a value. + * The return value is an object with properties that are version specific. + * The properties must not expose anything that would lead to security + * issues (e.g. exposing compiled function 'data' buffer might be an issue). + * Currently only counts and sizes and such are given so there shouldn't + * be security implications. + */ + +#define DUK__IDX_TYPE 0 +#define DUK__IDX_ITAG 1 +#define DUK__IDX_REFC 2 +#define DUK__IDX_HBYTES 3 +#define DUK__IDX_CLASS 4 +#define DUK__IDX_PBYTES 5 +#define DUK__IDX_ESIZE 6 +#define DUK__IDX_ENEXT 7 +#define DUK__IDX_ASIZE 8 +#define DUK__IDX_HSIZE 9 +#define DUK__IDX_BCBYTES 10 +#define DUK__IDX_DBYTES 11 +#define DUK__IDX_TSTATE 12 +#define DUK__IDX_VARIANT 13 + +DUK_EXTERNAL void duk_inspect_value(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_heaphdr *h; + /* The temporary values should be in an array rather than individual + * variables which (in practice) ensures that the compiler won't map + * them to registers and emit a lot of unnecessary shuffling code. + */ + duk_int_t vals[14]; + + DUK_ASSERT_API_ENTRY(thr); + + /* Assume two's complement and set everything to -1. */ + duk_memset((void *) &vals, (int) 0xff, sizeof(vals)); + DUK_ASSERT(vals[DUK__IDX_TYPE] == -1); /* spot check one */ + + tv = duk_get_tval_or_unused(thr, idx); + h = (DUK_TVAL_IS_HEAP_ALLOCATED(tv) ? DUK_TVAL_GET_HEAPHDR(tv) : NULL); + + vals[DUK__IDX_TYPE] = duk_get_type_tval(tv); + vals[DUK__IDX_ITAG] = (duk_int_t) DUK_TVAL_GET_TAG(tv); + + duk_push_bare_object(thr); /* Invalidates 'tv'. */ + tv = NULL; + + if (h == NULL) { + goto finish; + } + duk_push_pointer(thr, (void *) h); + duk_put_prop_literal(thr, -2, "hptr"); + +#if 0 + /* Covers a lot of information, e.g. buffer and string variants. */ + duk_push_uint(thr, (duk_uint_t) DUK_HEAPHDR_GET_FLAGS(h)); + duk_put_prop_literal(thr, -2, "hflags"); +#endif + +#if defined(DUK_USE_REFERENCE_COUNTING) + vals[DUK__IDX_REFC] = (duk_int_t) DUK_HEAPHDR_GET_REFCOUNT(h); +#endif + vals[DUK__IDX_VARIANT] = 0; + + /* Heaphdr size and additional allocation size, followed by + * type specific stuff (with varying value count). + */ + switch ((duk_small_int_t) DUK_HEAPHDR_GET_TYPE(h)) { + case DUK_HTYPE_STRING: { + duk_hstring *h_str = (duk_hstring *) h; + vals[DUK__IDX_HBYTES] = (duk_int_t) (sizeof(duk_hstring) + DUK_HSTRING_GET_BYTELEN(h_str) + 1); +#if defined(DUK_USE_HSTRING_EXTDATA) + if (DUK_HSTRING_HAS_EXTDATA(h_str)) { + vals[DUK__IDX_VARIANT] = 1; + } +#endif + break; + } + case DUK_HTYPE_OBJECT: { + duk_hobject *h_obj = (duk_hobject *) h; + + /* XXX: variants here are maybe pointless; class is enough? */ + if (DUK_HOBJECT_IS_ARRAY(h_obj)) { + vals[DUK__IDX_HBYTES] = sizeof(duk_harray); + } else if (DUK_HOBJECT_IS_COMPFUNC(h_obj)) { + vals[DUK__IDX_HBYTES] = sizeof(duk_hcompfunc); + } else if (DUK_HOBJECT_IS_NATFUNC(h_obj)) { + vals[DUK__IDX_HBYTES] = sizeof(duk_hnatfunc); + } else if (DUK_HOBJECT_IS_THREAD(h_obj)) { + vals[DUK__IDX_HBYTES] = sizeof(duk_hthread); + vals[DUK__IDX_TSTATE] = ((duk_hthread *) h_obj)->state; +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + } else if (DUK_HOBJECT_IS_BUFOBJ(h_obj)) { + vals[DUK__IDX_HBYTES] = sizeof(duk_hbufobj); + /* XXX: some size information */ +#endif + } else { + vals[DUK__IDX_HBYTES] = (duk_small_uint_t) sizeof(duk_hobject); + } + + vals[DUK__IDX_CLASS] = (duk_int_t) DUK_HOBJECT_GET_CLASS_NUMBER(h_obj); + vals[DUK__IDX_PBYTES] = (duk_int_t) DUK_HOBJECT_P_ALLOC_SIZE(h_obj); + vals[DUK__IDX_ESIZE] = (duk_int_t) DUK_HOBJECT_GET_ESIZE(h_obj); + vals[DUK__IDX_ENEXT] = (duk_int_t) DUK_HOBJECT_GET_ENEXT(h_obj); + vals[DUK__IDX_ASIZE] = (duk_int_t) DUK_HOBJECT_GET_ASIZE(h_obj); + vals[DUK__IDX_HSIZE] = (duk_int_t) DUK_HOBJECT_GET_HSIZE(h_obj); + + /* Note: e_next indicates the number of gc-reachable entries + * in the entry part, and also indicates the index where the + * next new property would be inserted. It does *not* indicate + * the number of non-NULL keys present in the object. That + * value could be counted separately but requires a pass through + * the key list. + */ + + if (DUK_HOBJECT_IS_COMPFUNC(h_obj)) { + duk_hbuffer *h_data = (duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA(thr->heap, (duk_hcompfunc *) h_obj); + vals[DUK__IDX_BCBYTES] = (duk_int_t) (h_data ? DUK_HBUFFER_GET_SIZE(h_data) : 0); + } + break; + } + case DUK_HTYPE_BUFFER: { + duk_hbuffer *h_buf = (duk_hbuffer *) h; + + if (DUK_HBUFFER_HAS_DYNAMIC(h_buf)) { + if (DUK_HBUFFER_HAS_EXTERNAL(h_buf)) { + vals[DUK__IDX_VARIANT] = 2; /* buffer variant 2: external */ + vals[DUK__IDX_HBYTES] = (duk_uint_t) (sizeof(duk_hbuffer_external)); + } else { + /* When alloc_size == 0 the second allocation may not + * actually exist. + */ + vals[DUK__IDX_VARIANT] = 1; /* buffer variant 1: dynamic */ + vals[DUK__IDX_HBYTES] = (duk_uint_t) (sizeof(duk_hbuffer_dynamic)); + } + vals[DUK__IDX_DBYTES] = (duk_int_t) (DUK_HBUFFER_GET_SIZE(h_buf)); + } else { + DUK_ASSERT(vals[DUK__IDX_VARIANT] == 0); /* buffer variant 0: fixed */ + vals[DUK__IDX_HBYTES] = (duk_int_t) (sizeof(duk_hbuffer_fixed) + DUK_HBUFFER_GET_SIZE(h_buf)); + } + break; + } + } + + finish: + duk__inspect_multiple_uint(thr, + "type" "\x00" "itag" "\x00" "refc" "\x00" "hbytes" "\x00" "class" "\x00" + "pbytes" "\x00" "esize" "\x00" "enext" "\x00" "asize" "\x00" "hsize" "\x00" + "bcbytes" "\x00" "dbytes" "\x00" "tstate" "\x00" "variant" "\x00" "\x00", + (duk_int_t *) &vals); +} + +DUK_EXTERNAL void duk_inspect_callstack_entry(duk_hthread *thr, duk_int_t level) { + duk_activation *act; + duk_uint_fast32_t pc; + duk_uint_fast32_t line; + + DUK_ASSERT_API_ENTRY(thr); + + /* -1 = top callstack entry + * -2 = caller of level -1 + * etc + */ + act = duk_hthread_get_activation_for_level(thr, level); + if (act == NULL) { + duk_push_undefined(thr); + return; + } + duk_push_bare_object(thr); + + /* Relevant PC is just before current one because PC is + * post-incremented. This should match what error augment + * code does. + */ + pc = duk_hthread_get_act_prev_pc(thr, act); + + duk_push_tval(thr, &act->tv_func); + + duk_push_uint(thr, (duk_uint_t) pc); + duk_put_prop_stridx_short(thr, -3, DUK_STRIDX_PC); + +#if defined(DUK_USE_PC2LINE) + line = duk_hobject_pc2line_query(thr, -1, pc); +#else + line = 0; +#endif + duk_push_uint(thr, (duk_uint_t) line); + duk_put_prop_stridx_short(thr, -3, DUK_STRIDX_LINE_NUMBER); + + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_LC_FUNCTION); + /* Providing access to e.g. act->lex_env would be dangerous: these + * internal structures must never be accessible to the application. + * Duktape relies on them having consistent data, and this consistency + * is only asserted for, not checked for. + */ +} + +/* automatic undefs */ +#undef DUK__IDX_ASIZE +#undef DUK__IDX_BCBYTES +#undef DUK__IDX_CLASS +#undef DUK__IDX_DBYTES +#undef DUK__IDX_ENEXT +#undef DUK__IDX_ESIZE +#undef DUK__IDX_HBYTES +#undef DUK__IDX_HSIZE +#undef DUK__IDX_ITAG +#undef DUK__IDX_PBYTES +#undef DUK__IDX_REFC +#undef DUK__IDX_TSTATE +#undef DUK__IDX_TYPE +#undef DUK__IDX_VARIANT +#line 1 "duk_api_memory.c" +/* + * Memory calls. + */ + +/* #include duk_internal.h -> already included */ + +DUK_EXTERNAL void *duk_alloc_raw(duk_hthread *thr, duk_size_t size) { + DUK_ASSERT_API_ENTRY(thr); + + return DUK_ALLOC_RAW(thr->heap, size); +} + +DUK_EXTERNAL void duk_free_raw(duk_hthread *thr, void *ptr) { + DUK_ASSERT_API_ENTRY(thr); + + DUK_FREE_RAW(thr->heap, ptr); +} + +DUK_EXTERNAL void *duk_realloc_raw(duk_hthread *thr, void *ptr, duk_size_t size) { + DUK_ASSERT_API_ENTRY(thr); + + return DUK_REALLOC_RAW(thr->heap, ptr, size); +} + +DUK_EXTERNAL void *duk_alloc(duk_hthread *thr, duk_size_t size) { + DUK_ASSERT_API_ENTRY(thr); + + return DUK_ALLOC(thr->heap, size); +} + +DUK_EXTERNAL void duk_free(duk_hthread *thr, void *ptr) { + DUK_ASSERT_API_ENTRY(thr); + + DUK_FREE_CHECKED(thr, ptr); +} + +DUK_EXTERNAL void *duk_realloc(duk_hthread *thr, void *ptr, duk_size_t size) { + DUK_ASSERT_API_ENTRY(thr); + + /* + * Note: since this is an exposed API call, there should be + * no way a mark-and-sweep could have a side effect on the + * memory allocation behind 'ptr'; the pointer should never + * be something that Duktape wants to change. + * + * Thus, no need to use DUK_REALLOC_INDIRECT (and we don't + * have the storage location here anyway). + */ + + return DUK_REALLOC(thr->heap, ptr, size); +} + +DUK_EXTERNAL void duk_get_memory_functions(duk_hthread *thr, duk_memory_functions *out_funcs) { + duk_heap *heap; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(out_funcs != NULL); + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + + heap = thr->heap; + out_funcs->alloc_func = heap->alloc_func; + out_funcs->realloc_func = heap->realloc_func; + out_funcs->free_func = heap->free_func; + out_funcs->udata = heap->heap_udata; +} + +DUK_EXTERNAL void duk_gc(duk_hthread *thr, duk_uint_t flags) { + duk_heap *heap; + duk_small_uint_t ms_flags; + + DUK_ASSERT_API_ENTRY(thr); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + DUK_D(DUK_DPRINT("mark-and-sweep requested by application")); + DUK_ASSERT(DUK_GC_COMPACT == DUK_MS_FLAG_EMERGENCY); /* Compact flag is 1:1 with emergency flag which forces compaction. */ + ms_flags = (duk_small_uint_t) flags; + duk_heap_mark_and_sweep(heap, ms_flags); +} +#line 1 "duk_api_object.c" +/* + * Object handling: property access and other support functions. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Property handling + * + * The API exposes only the most common property handling functions. + * The caller can invoke ECMAScript built-ins for full control (e.g. + * defineProperty, getOwnPropertyDescriptor). + */ + +DUK_EXTERNAL duk_bool_t duk_get_prop(duk_hthread *thr, duk_idx_t obj_idx) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t rc; + + DUK_ASSERT_API_ENTRY(thr); + + /* Note: copying tv_obj and tv_key to locals to shield against a valstack + * resize is not necessary for a property get right now. + */ + + tv_obj = duk_require_tval(thr, obj_idx); + tv_key = duk_require_tval(thr, -1); + + rc = duk_hobject_getprop(thr, tv_obj, tv_key); + DUK_ASSERT(rc == 0 || rc == 1); + /* a value is left on stack regardless of rc */ + + duk_remove_m2(thr); /* remove key */ + DUK_ASSERT(duk_is_undefined(thr, -1) || rc == 1); + return rc; /* 1 if property found, 0 otherwise */ +} + +DUK_EXTERNAL duk_bool_t duk_get_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_string(thr, key); + return duk_get_prop(thr, obj_idx); +} + +DUK_EXTERNAL duk_bool_t duk_get_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_lstring(thr, key, key_len); + return duk_get_prop(thr, obj_idx); +} + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL duk_bool_t duk_get_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + DUK_ASSERT(key[key_len] == (char) 0); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_literal_raw(thr, key, key_len); + return duk_get_prop(thr, obj_idx); +} +#endif + +DUK_EXTERNAL duk_bool_t duk_get_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_uarridx(thr, arr_idx); + return duk_get_prop(thr, obj_idx); +} + +DUK_EXTERNAL duk_bool_t duk_get_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */ + return duk_get_prop(thr, obj_idx); +} + +DUK_INTERNAL duk_bool_t duk_get_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx)); + return duk_get_prop(thr, obj_idx); +} + +DUK_INTERNAL duk_bool_t duk_get_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) { + return duk_get_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16), + (duk_small_uint_t) (packed_args & 0xffffUL)); +} + +DUK_INTERNAL duk_bool_t duk_get_prop_stridx_boolean(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_bool_t *out_has_prop) { + duk_bool_t rc; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + + rc = duk_get_prop_stridx(thr, obj_idx, stridx); + if (out_has_prop) { + *out_has_prop = rc; + } + return duk_to_boolean_top_pop(thr); +} + +DUK_LOCAL duk_bool_t duk__put_prop_shared(duk_hthread *thr, duk_idx_t obj_idx, duk_idx_t idx_key) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_tval *tv_val; + duk_bool_t throw_flag; + duk_bool_t rc; + + /* Note: copying tv_obj and tv_key to locals to shield against a valstack + * resize is not necessary for a property put right now (putprop protects + * against it internally). + */ + + /* Key and value indices are either (-2, -1) or (-1, -2). Given idx_key, + * idx_val is always (idx_key ^ 0x01). + */ + DUK_ASSERT((idx_key == -2 && (idx_key ^ 1) == -1) || + (idx_key == -1 && (idx_key ^ 1) == -2)); + /* XXX: Direct access; faster validation. */ + tv_obj = duk_require_tval(thr, obj_idx); + tv_key = duk_require_tval(thr, idx_key); + tv_val = duk_require_tval(thr, idx_key ^ 1); + throw_flag = duk_is_strict_call(thr); + + rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, throw_flag); + DUK_ASSERT(rc == 0 || rc == 1); + + duk_pop_2(thr); /* remove key and value */ + return rc; /* 1 if property found, 0 otherwise */ +} + +DUK_EXTERNAL duk_bool_t duk_put_prop(duk_hthread *thr, duk_idx_t obj_idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__put_prop_shared(thr, obj_idx, -2); +} + +DUK_EXTERNAL duk_bool_t duk_put_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + /* Careful here and with other duk_put_prop_xxx() helpers: the + * target object and the property value may be in the same value + * stack slot (unusual, but still conceptually clear). + */ + obj_idx = duk_normalize_index(thr, obj_idx); + (void) duk_push_string(thr, key); + return duk__put_prop_shared(thr, obj_idx, -1); +} + +DUK_EXTERNAL duk_bool_t duk_put_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_normalize_index(thr, obj_idx); + (void) duk_push_lstring(thr, key, key_len); + return duk__put_prop_shared(thr, obj_idx, -1); +} + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL duk_bool_t duk_put_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + DUK_ASSERT(key[key_len] == (char) 0); + + obj_idx = duk_normalize_index(thr, obj_idx); + (void) duk_push_literal_raw(thr, key, key_len); + return duk__put_prop_shared(thr, obj_idx, -1); +} +#endif + +DUK_EXTERNAL duk_bool_t duk_put_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_uarridx(thr, arr_idx); + return duk__put_prop_shared(thr, obj_idx, -1); +} + +DUK_EXTERNAL duk_bool_t duk_put_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */ + return duk__put_prop_shared(thr, obj_idx, -1); +} + + +DUK_INTERNAL duk_bool_t duk_put_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx)); + return duk__put_prop_shared(thr, obj_idx, -1); +} + +DUK_INTERNAL duk_bool_t duk_put_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) { + return duk_put_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16), + (duk_small_uint_t) (packed_args & 0xffffUL)); +} + +DUK_EXTERNAL duk_bool_t duk_del_prop(duk_hthread *thr, duk_idx_t obj_idx) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t throw_flag; + duk_bool_t rc; + + DUK_ASSERT_API_ENTRY(thr); + + /* Note: copying tv_obj and tv_key to locals to shield against a valstack + * resize is not necessary for a property delete right now. + */ + + tv_obj = duk_require_tval(thr, obj_idx); + tv_key = duk_require_tval(thr, -1); + throw_flag = duk_is_strict_call(thr); + + rc = duk_hobject_delprop(thr, tv_obj, tv_key, throw_flag); + DUK_ASSERT(rc == 0 || rc == 1); + + duk_pop(thr); /* remove key */ + return rc; +} + +DUK_EXTERNAL duk_bool_t duk_del_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_string(thr, key); + return duk_del_prop(thr, obj_idx); +} + +DUK_EXTERNAL duk_bool_t duk_del_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_lstring(thr, key, key_len); + return duk_del_prop(thr, obj_idx); +} + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL duk_bool_t duk_del_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + DUK_ASSERT(key[key_len] == (char) 0); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_literal_raw(thr, key, key_len); + return duk_del_prop(thr, obj_idx); +} +#endif + +DUK_EXTERNAL duk_bool_t duk_del_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_uarridx(thr, arr_idx); + return duk_del_prop(thr, obj_idx); +} + +DUK_EXTERNAL duk_bool_t duk_del_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */ + return duk_del_prop(thr, obj_idx); +} + +DUK_INTERNAL duk_bool_t duk_del_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx)); + return duk_del_prop(thr, obj_idx); +} + +#if 0 +DUK_INTERNAL duk_bool_t duk_del_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) { + return duk_del_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16), + (duk_small_uint_t) (packed_args & 0xffffUL)); +} +#endif + +DUK_EXTERNAL duk_bool_t duk_has_prop(duk_hthread *thr, duk_idx_t obj_idx) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t rc; + + DUK_ASSERT_API_ENTRY(thr); + + /* Note: copying tv_obj and tv_key to locals to shield against a valstack + * resize is not necessary for a property existence check right now. + */ + + tv_obj = duk_require_tval(thr, obj_idx); + tv_key = duk_require_tval(thr, -1); + + rc = duk_hobject_hasprop(thr, tv_obj, tv_key); + DUK_ASSERT(rc == 0 || rc == 1); + + duk_pop(thr); /* remove key */ + return rc; /* 1 if property found, 0 otherwise */ +} + +DUK_EXTERNAL duk_bool_t duk_has_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_string(thr, key); + return duk_has_prop(thr, obj_idx); +} + +DUK_EXTERNAL duk_bool_t duk_has_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_lstring(thr, key, key_len); + return duk_has_prop(thr, obj_idx); +} + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL duk_bool_t duk_has_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(key != NULL); + DUK_ASSERT(key[key_len] == (char) 0); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_literal_raw(thr, key, key_len); + return duk_has_prop(thr, obj_idx); +} +#endif + +DUK_EXTERNAL duk_bool_t duk_has_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_uarridx(thr, arr_idx); + return duk_has_prop(thr, obj_idx); +} + +DUK_EXTERNAL duk_bool_t duk_has_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + (void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */ + return duk_has_prop(thr, obj_idx); +} + +DUK_INTERNAL duk_bool_t duk_has_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx)); + return duk_has_prop(thr, obj_idx); +} + +#if 0 +DUK_INTERNAL duk_bool_t duk_has_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) { + return duk_has_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16), + (duk_small_uint_t) (packed_args & 0xffffUL)); +} +#endif + +/* Define own property without inheritance lookups and such. This differs from + * [[DefineOwnProperty]] because special behaviors (like Array 'length') are + * not invoked by this method. The caller must be careful to invoke any such + * behaviors if necessary. + */ +DUK_INTERNAL void duk_xdef_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t desc_flags) { + duk_hobject *obj; + duk_hstring *key; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_require_hobject(thr, obj_idx); + DUK_ASSERT(obj != NULL); + key = duk_to_property_key_hstring(thr, -2); + DUK_ASSERT(key != NULL); + DUK_ASSERT(duk_require_tval(thr, -1) != NULL); + + duk_hobject_define_property_internal(thr, obj, key, desc_flags); + + duk_pop(thr); /* pop key */ +} + +DUK_INTERNAL void duk_xdef_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx, duk_small_uint_t desc_flags) { + duk_hobject *obj; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_require_hobject(thr, obj_idx); + DUK_ASSERT(obj != NULL); + + duk_hobject_define_property_internal_arridx(thr, obj, arr_idx, desc_flags); + /* value popped by call */ +} + +DUK_INTERNAL void duk_xdef_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_small_uint_t desc_flags) { + duk_hobject *obj; + duk_hstring *key; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + + obj = duk_require_hobject(thr, obj_idx); + DUK_ASSERT(obj != NULL); + key = DUK_HTHREAD_GET_STRING(thr, stridx); + DUK_ASSERT(key != NULL); + DUK_ASSERT(duk_require_tval(thr, -1) != NULL); + + duk_hobject_define_property_internal(thr, obj, key, desc_flags); + /* value popped by call */ +} + +DUK_INTERNAL void duk_xdef_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) { + duk_xdef_prop_stridx(thr, (duk_idx_t) (duk_int8_t) (packed_args >> 24), + (duk_small_uint_t) (packed_args >> 8) & 0xffffUL, + (duk_small_uint_t) (packed_args & 0xffL)); +} + +#if 0 /*unused*/ +DUK_INTERNAL void duk_xdef_prop_stridx_builtin(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_small_int_t builtin_idx, duk_small_uint_t desc_flags) { + duk_hobject *obj; + duk_hstring *key; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + DUK_ASSERT_BIDX_VALID(builtin_idx); + + obj = duk_require_hobject(thr, obj_idx); + DUK_ASSERT(obj != NULL); + key = DUK_HTHREAD_GET_STRING(thr, stridx); + DUK_ASSERT(key != NULL); + + duk_push_hobject(thr, thr->builtins[builtin_idx]); + duk_hobject_define_property_internal(thr, obj, key, desc_flags); + /* value popped by call */ +} +#endif + +/* This is a rare property helper; it sets the global thrower (E5 Section 13.2.3) + * setter/getter into an object property. This is needed by the 'arguments' + * object creation code, function instance creation code, and Function.prototype.bind(). + */ + +DUK_INTERNAL void duk_xdef_prop_stridx_thrower(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) { + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + duk_push_hstring_stridx(thr, stridx); + duk_push_hobject_bidx(thr, DUK_BIDX_TYPE_ERROR_THROWER); + duk_dup_top(thr); + duk_def_prop(thr, obj_idx, DUK_DEFPROP_HAVE_SETTER | DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_FORCE); /* attributes always 0 */ +} + +/* Object.getOwnPropertyDescriptor() equivalent C binding. */ +DUK_EXTERNAL void duk_get_prop_desc(duk_hthread *thr, duk_idx_t obj_idx, duk_uint_t flags) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(flags); /* no flags defined yet */ + + duk_hobject_object_get_own_property_descriptor(thr, obj_idx); /* [ ... key ] -> [ ... desc ] */ +} + +/* Object.defineProperty() equivalent C binding. */ +DUK_EXTERNAL void duk_def_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_uint_t flags) { + duk_idx_t idx_base; + duk_hobject *obj; + duk_hstring *key; + duk_idx_t idx_value; + duk_hobject *get; + duk_hobject *set; + duk_uint_t is_data_desc; + duk_uint_t is_acc_desc; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_require_hobject(thr, obj_idx); + + is_data_desc = flags & (DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_HAVE_WRITABLE); + is_acc_desc = flags & (DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_HAVE_SETTER); + if (is_data_desc && is_acc_desc) { + /* "Have" flags must not be conflicting so that they would + * apply to both a plain property and an accessor at the same + * time. + */ + goto fail_invalid_desc; + } + + idx_base = duk_get_top_index(thr); + if (flags & DUK_DEFPROP_HAVE_SETTER) { + duk_require_type_mask(thr, idx_base, DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_LIGHTFUNC); + set = duk_get_hobject_promote_lfunc(thr, idx_base); + if (set != NULL && !DUK_HOBJECT_IS_CALLABLE(set)) { + goto fail_not_callable; + } + idx_base--; + } else { + set = NULL; + } + if (flags & DUK_DEFPROP_HAVE_GETTER) { + duk_require_type_mask(thr, idx_base, DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_LIGHTFUNC); + get = duk_get_hobject_promote_lfunc(thr, idx_base); + if (get != NULL && !DUK_HOBJECT_IS_CALLABLE(get)) { + goto fail_not_callable; + } + idx_base--; + } else { + get = NULL; + } + if (flags & DUK_DEFPROP_HAVE_VALUE) { + idx_value = idx_base; + idx_base--; + } else { + idx_value = (duk_idx_t) -1; + } + key = duk_to_property_key_hstring(thr, idx_base); + DUK_ASSERT(key != NULL); + + duk_require_valid_index(thr, idx_base); + + duk_hobject_define_property_helper(thr, + flags /*defprop_flags*/, + obj, + key, + idx_value, + get, + set, + 1 /*throw_flag*/); + + /* Clean up stack */ + + duk_set_top(thr, idx_base); + + /* [ ... obj ... ] */ + + return; + + fail_invalid_desc: + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_DESCRIPTOR); + DUK_WO_NORETURN(return;); + + fail_not_callable: + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE); + DUK_WO_NORETURN(return;); +} + +/* + * Object related + * + * Note: seal() and freeze() are accessible through ECMAScript bindings, + * and are not exposed through the API. + */ + +DUK_EXTERNAL void duk_compact(duk_hthread *thr, duk_idx_t obj_idx) { + duk_hobject *obj; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_get_hobject(thr, obj_idx); + if (obj) { + /* Note: this may fail, caller should protect the call if necessary */ + duk_hobject_compact_props(thr, obj); + } +} + +DUK_INTERNAL void duk_compact_m1(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + duk_compact(thr, -1); +} + +/* XXX: the duk_hobject_enum.c stack APIs should be reworked */ + +DUK_EXTERNAL void duk_enum(duk_hthread *thr, duk_idx_t obj_idx, duk_uint_t enum_flags) { + DUK_ASSERT_API_ENTRY(thr); + + duk_dup(thr, obj_idx); + duk_require_hobject_promote_mask(thr, -1, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + duk_hobject_enumerator_create(thr, enum_flags); /* [target] -> [enum] */ +} + +DUK_EXTERNAL duk_bool_t duk_next(duk_hthread *thr, duk_idx_t enum_index, duk_bool_t get_value) { + DUK_ASSERT_API_ENTRY(thr); + + duk_require_hobject(thr, enum_index); + duk_dup(thr, enum_index); + return duk_hobject_enumerator_next(thr, get_value); +} + +DUK_INTERNAL void duk_seal_freeze_raw(duk_hthread *thr, duk_idx_t obj_idx, duk_bool_t is_freeze) { + duk_tval *tv; + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, obj_idx); + DUK_ASSERT(tv != NULL); + + /* Seal/freeze are quite rare in practice so it'd be nice to get the + * correct behavior simply via automatic promotion (at the cost of some + * memory churn). However, the promoted objects don't behave the same, + * e.g. promoted lightfuncs are extensible. + */ + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_BUFFER: + /* Plain buffer: already sealed, but not frozen (and can't be frozen + * because index properties can't be made non-writable. + */ + if (is_freeze) { + goto fail_cannot_freeze; + } + break; + case DUK_TAG_LIGHTFUNC: + /* Lightfunc: already sealed and frozen, success. */ + break; + case DUK_TAG_OBJECT: + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (is_freeze && DUK_HOBJECT_IS_BUFOBJ(h)) { + /* Buffer objects cannot be frozen because there's no internal + * support for making virtual array indices non-writable. + */ + DUK_DD(DUK_DDPRINT("cannot freeze a buffer object")); + goto fail_cannot_freeze; + } + duk_hobject_object_seal_freeze_helper(thr, h, is_freeze); + + /* Sealed and frozen objects cannot gain any more properties, + * so this is a good time to compact them. + */ + duk_hobject_compact_props(thr, h); + break; + default: + /* ES2015 Sections 19.1.2.5, 19.1.2.17 */ + break; + } + return; + + fail_cannot_freeze: + DUK_ERROR_TYPE_INVALID_ARGS(thr); /* XXX: proper error message */ + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_seal(duk_hthread *thr, duk_idx_t obj_idx) { + DUK_ASSERT_API_ENTRY(thr); + + duk_seal_freeze_raw(thr, obj_idx, 0 /*is_freeze*/); +} + +DUK_EXTERNAL void duk_freeze(duk_hthread *thr, duk_idx_t obj_idx) { + DUK_ASSERT_API_ENTRY(thr); + + duk_seal_freeze_raw(thr, obj_idx, 1 /*is_freeze*/); +} + +/* + * Helpers for writing multiple properties + */ + +DUK_EXTERNAL void duk_put_function_list(duk_hthread *thr, duk_idx_t obj_idx, const duk_function_list_entry *funcs) { + const duk_function_list_entry *ent = funcs; + + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + if (ent != NULL) { + while (ent->key != NULL) { + duk_push_c_function(thr, ent->value, ent->nargs); + duk_put_prop_string(thr, obj_idx, ent->key); + ent++; + } + } +} + +DUK_EXTERNAL void duk_put_number_list(duk_hthread *thr, duk_idx_t obj_idx, const duk_number_list_entry *numbers) { + const duk_number_list_entry *ent = numbers; + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + obj_idx = duk_require_normalize_index(thr, obj_idx); + if (ent != NULL) { + while (ent->key != NULL) { + tv = thr->valstack_top++; + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); /* value stack init policy */ + DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(tv, ent->value); /* no need for decref/incref */ + duk_put_prop_string(thr, obj_idx, ent->key); + ent++; + } + } +} + +/* + * Shortcut for accessing global object properties + */ + +DUK_EXTERNAL duk_bool_t duk_get_global_string(duk_hthread *thr, const char *key) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + ret = duk_get_prop_string(thr, -1, key); + duk_remove_m2(thr); + return ret; +} + +DUK_EXTERNAL duk_bool_t duk_get_global_lstring(duk_hthread *thr, const char *key, duk_size_t key_len) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + ret = duk_get_prop_lstring(thr, -1, key, key_len); + duk_remove_m2(thr); + return ret; +} + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL duk_bool_t duk_get_global_literal_raw(duk_hthread *thr, const char *key, duk_size_t key_len) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + DUK_ASSERT(key[key_len] == (char) 0); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + ret = duk_get_prop_literal_raw(thr, -1, key, key_len); + duk_remove_m2(thr); + return ret; +} +#endif + +DUK_EXTERNAL duk_bool_t duk_get_global_heapptr(duk_hthread *thr, void *ptr) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + ret = duk_get_prop_heapptr(thr, -1, ptr); + duk_remove_m2(thr); + return ret; +} + + +DUK_EXTERNAL duk_bool_t duk_put_global_string(duk_hthread *thr, const char *key) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + duk_insert(thr, -2); + ret = duk_put_prop_string(thr, -2, key); /* [ ... global val ] -> [ ... global ] */ + duk_pop(thr); + return ret; +} + +DUK_EXTERNAL duk_bool_t duk_put_global_lstring(duk_hthread *thr, const char *key, duk_size_t key_len) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + duk_insert(thr, -2); + ret = duk_put_prop_lstring(thr, -2, key, key_len); /* [ ... global val ] -> [ ... global ] */ + duk_pop(thr); + return ret; +} + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL duk_bool_t duk_put_global_literal_raw(duk_hthread *thr, const char *key, duk_size_t key_len) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + DUK_ASSERT(key[key_len] == (char) 0); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + duk_insert(thr, -2); + ret = duk_put_prop_literal_raw(thr, -2, key, key_len); /* [ ... global val ] -> [ ... global ] */ + duk_pop(thr); + return ret; +} +#endif + +DUK_EXTERNAL duk_bool_t duk_put_global_heapptr(duk_hthread *thr, void *ptr) { + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + + /* XXX: direct implementation */ + + duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]); + duk_insert(thr, -2); + ret = duk_put_prop_heapptr(thr, -2, ptr); /* [ ... global val ] -> [ ... global ] */ + duk_pop(thr); + return ret; +} + +/* + * ES2015 GetMethod() + */ + +DUK_INTERNAL duk_bool_t duk_get_method_stridx(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t stridx) { + (void) duk_get_prop_stridx(thr, idx, stridx); + if (duk_is_null_or_undefined(thr, -1)) { + duk_pop_nodecref_unsafe(thr); + return 0; + } + if (!duk_is_callable(thr, -1)) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE); + DUK_WO_NORETURN(return 0;); + } + return 1; +} + +/* + * Object prototype + */ + +DUK_EXTERNAL void duk_get_prototype(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *obj; + duk_hobject *proto; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_require_hobject(thr, idx); + DUK_ASSERT(obj != NULL); + + /* XXX: shared helper for duk_push_hobject_or_undefined()? */ + proto = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, obj); + if (proto) { + duk_push_hobject(thr, proto); + } else { + duk_push_undefined(thr); + } +} + +DUK_EXTERNAL void duk_set_prototype(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *obj; + duk_hobject *proto; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_require_hobject(thr, idx); + DUK_ASSERT(obj != NULL); + duk_require_type_mask(thr, -1, DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_OBJECT); + proto = duk_get_hobject(thr, -1); + /* proto can also be NULL here (allowed explicitly) */ + +#if defined(DUK_USE_ROM_OBJECTS) + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); /* XXX: "read only object"? */ + DUK_WO_NORETURN(return;); + } +#endif + + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, obj, proto); + + duk_pop(thr); +} + +/* + * Object finalizer + */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) +/* XXX: these could be implemented as macros calling an internal function + * directly. + * XXX: same issue as with Duktape.fin: there's no way to delete the property + * now (just set it to undefined). + */ +DUK_EXTERNAL void duk_get_finalizer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + duk_get_prop_stridx(thr, idx, DUK_STRIDX_INT_FINALIZER); +} + +DUK_EXTERNAL void duk_set_finalizer(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + duk_bool_t callable; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_require_hobject(thr, idx); /* Get before 'put' so that 'idx' is correct. */ + callable = duk_is_callable(thr, -1); + duk_put_prop_stridx(thr, idx, DUK_STRIDX_INT_FINALIZER); + + /* In addition to setting the finalizer property, keep a "have + * finalizer" flag in duk_hobject in sync so that refzero can do + * a very quick finalizer check by walking the prototype chain + * and checking the flag alone. (Note that this means that just + * setting _Finalizer on an object won't affect finalizer checks.) + * + * NOTE: if the argument is a Proxy object, this flag will be set + * on the Proxy, not the target. As a result, the target won't get + * a finalizer flag and the Proxy also won't be finalized as there's + * an explicit Proxy check in finalization now. + */ + if (callable) { + DUK_HOBJECT_SET_HAVE_FINALIZER(h); + } else { + DUK_HOBJECT_CLEAR_HAVE_FINALIZER(h); + } +} +#else /* DUK_USE_FINALIZER_SUPPORT */ +DUK_EXTERNAL void duk_get_finalizer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_set_finalizer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(idx); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ +#line 1 "duk_api_random.c" +/* + * Random numbers + */ + +/* #include duk_internal.h -> already included */ + +DUK_EXTERNAL duk_double_t duk_random(duk_hthread *thr) { + return (duk_double_t) DUK_UTIL_GET_RANDOM_DOUBLE(thr); +} +#line 1 "duk_api_stack.c" +/* + * API calls related to general value stack manipulation: resizing the value + * stack, pushing and popping values, type checking and reading values, + * coercing values, etc. + * + * Also contains internal functions (such as duk_get_tval()), defined + * in duk_api_internal.h, with semantics similar to the public API. + */ + +/* XXX: repetition of stack pre-checks -> helper or macro or inline */ +/* XXX: shared api error strings, and perhaps even throw code for rare cases? */ + +/* #include duk_internal.h -> already included */ + +/* + * Forward declarations + */ + +DUK_LOCAL_DECL duk_idx_t duk__push_c_function_raw(duk_hthread *thr, duk_c_function func, duk_idx_t nargs, duk_uint_t flags, duk_small_uint_t proto_bidx); + +/* + * Global state for working around missing variadic macros + */ + +#if !defined(DUK_USE_VARIADIC_MACROS) +DUK_EXTERNAL const char *duk_api_global_filename = NULL; +DUK_EXTERNAL duk_int_t duk_api_global_line = 0; +#endif + +/* + * Misc helpers + */ + +DUK_LOCAL const char * const duk__symbol_type_strings[4] = { + "hidden", "global", "local", "wellknown" +}; + +#if !defined(DUK_USE_PACKED_TVAL) +DUK_LOCAL const duk_uint_t duk__type_from_tag[] = { + DUK_TYPE_NUMBER, + DUK_TYPE_NUMBER, /* fastint */ + DUK_TYPE_UNDEFINED, + DUK_TYPE_NULL, + DUK_TYPE_BOOLEAN, + DUK_TYPE_POINTER, + DUK_TYPE_LIGHTFUNC, + DUK_TYPE_NONE, + DUK_TYPE_STRING, + DUK_TYPE_OBJECT, + DUK_TYPE_BUFFER, +}; +DUK_LOCAL const duk_uint_t duk__type_mask_from_tag[] = { + DUK_TYPE_MASK_NUMBER, + DUK_TYPE_MASK_NUMBER, /* fastint */ + DUK_TYPE_MASK_UNDEFINED, + DUK_TYPE_MASK_NULL, + DUK_TYPE_MASK_BOOLEAN, + DUK_TYPE_MASK_POINTER, + DUK_TYPE_MASK_LIGHTFUNC, + DUK_TYPE_MASK_NONE, + DUK_TYPE_MASK_STRING, + DUK_TYPE_MASK_OBJECT, + DUK_TYPE_MASK_BUFFER, +}; +#endif /* !DUK_USE_PACKED_TVAL */ + +/* Assert that there's room for one value. */ +#define DUK__ASSERT_SPACE() do { \ + DUK_ASSERT(!(thr->valstack_top >= thr->valstack_end)); \ + } while (0) + +/* Check that there's room to push one value. */ +#if defined(DUK_USE_VALSTACK_UNSAFE) +/* Faster but value stack overruns are memory unsafe. */ +#define DUK__CHECK_SPACE() DUK__ASSERT_SPACE() +#else +#define DUK__CHECK_SPACE() do { \ + if (DUK_UNLIKELY(thr->valstack_top >= thr->valstack_end)) { \ + DUK_ERROR_RANGE_PUSH_BEYOND(thr); \ + } \ + } while (0) +#endif + +DUK_LOCAL duk_small_uint_t duk__get_symbol_type(duk_hstring *h) { + const duk_uint8_t *data; + duk_size_t len; + + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HSTRING_HAS_SYMBOL(h)); + DUK_ASSERT(DUK_HSTRING_GET_BYTELEN(h) >= 1); /* always true, symbol prefix */ + + data = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h); + len = DUK_HSTRING_GET_BYTELEN(h); + DUK_ASSERT(len >= 1); + + /* XXX: differentiate between 0x82 and 0xff (hidden vs. internal?)? */ + + if (data[0] == 0xffU) { + return DUK_SYMBOL_TYPE_HIDDEN; + } else if (data[0] == 0x82U) { + return DUK_SYMBOL_TYPE_HIDDEN; + } else if (data[0] == 0x80U) { + return DUK_SYMBOL_TYPE_GLOBAL; + } else if (data[len - 1] != 0xffU) { + return DUK_SYMBOL_TYPE_LOCAL; + } else { + return DUK_SYMBOL_TYPE_WELLKNOWN; + } +} + +DUK_LOCAL const char *duk__get_symbol_type_string(duk_hstring *h) { + duk_small_uint_t idx; + idx = duk__get_symbol_type(h); + DUK_ASSERT(idx < sizeof(duk__symbol_type_strings)); + return duk__symbol_type_strings[idx]; +} + +DUK_LOCAL_DECL duk_heaphdr *duk__get_tagged_heaphdr_raw(duk_hthread *thr, duk_idx_t idx, duk_uint_t tag); + +DUK_LOCAL duk_int_t duk__api_coerce_d2i(duk_hthread *thr, duk_idx_t idx, duk_int_t def_value, duk_bool_t require) { + duk_tval *tv; + duk_small_int_t c; + duk_double_t d; + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + /* + * Special cases like NaN and +/- Infinity are handled explicitly + * because a plain C coercion from double to int handles these cases + * in undesirable ways. For instance, NaN may coerce to INT_MIN + * (not zero), and INT_MAX + 1 may coerce to INT_MIN (not INT_MAX). + * + * This double-to-int coercion differs from ToInteger() because it + * has a finite range (ToInteger() allows e.g. +/- Infinity). It + * also differs from ToInt32() because the INT_MIN/INT_MAX clamping + * depends on the size of the int type on the platform. In particular, + * on platforms with a 64-bit int type, the full range is allowed. + */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + duk_int64_t t = DUK_TVAL_GET_FASTINT(tv); +#if (DUK_INT_MAX <= 0x7fffffffL) + /* Clamping only necessary for 32-bit ints. */ + if (t < DUK_INT_MIN) { + t = DUK_INT_MIN; + } else if (t > DUK_INT_MAX) { + t = DUK_INT_MAX; + } +#endif + return (duk_int_t) t; + } +#endif + + if (DUK_TVAL_IS_NUMBER(tv)) { + d = DUK_TVAL_GET_NUMBER(tv); + c = (duk_small_int_t) DUK_FPCLASSIFY(d); + if (c == DUK_FP_NAN) { + return 0; + } else if (d < (duk_double_t) DUK_INT_MIN) { + /* covers -Infinity */ + return DUK_INT_MIN; + } else if (d > (duk_double_t) DUK_INT_MAX) { + /* covers +Infinity */ + return DUK_INT_MAX; + } else { + /* coerce towards zero */ + return (duk_int_t) d; + } + } + + if (require) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "number", DUK_STR_NOT_NUMBER); + DUK_WO_NORETURN(return 0;); + } + + return def_value; +} + +DUK_LOCAL duk_uint_t duk__api_coerce_d2ui(duk_hthread *thr, duk_idx_t idx, duk_uint_t def_value, duk_bool_t require) { + duk_tval *tv; + duk_small_int_t c; + duk_double_t d; + + /* Same as above but for unsigned int range. */ + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + duk_int64_t t = DUK_TVAL_GET_FASTINT(tv); + if (t < 0) { + t = 0; + } +#if (DUK_UINT_MAX <= 0xffffffffUL) + /* Clamping only necessary for 32-bit ints. */ + else if (t > DUK_UINT_MAX) { + t = DUK_UINT_MAX; + } +#endif + return (duk_uint_t) t; + } +#endif + + if (DUK_TVAL_IS_NUMBER(tv)) { + d = DUK_TVAL_GET_NUMBER(tv); + c = (duk_small_int_t) DUK_FPCLASSIFY(d); + if (c == DUK_FP_NAN) { + return 0; + } else if (d < 0.0) { + /* covers -Infinity */ + return (duk_uint_t) 0; + } else if (d > (duk_double_t) DUK_UINT_MAX) { + /* covers +Infinity */ + return (duk_uint_t) DUK_UINT_MAX; + } else { + /* coerce towards zero */ + return (duk_uint_t) d; + } + } + + if (require) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "number", DUK_STR_NOT_NUMBER); + DUK_WO_NORETURN(return 0;); + } + + return def_value; +} + +/* + * Stack index validation/normalization and getting a stack duk_tval ptr. + * + * These are called by many API entrypoints so the implementations must be + * fast and "inlined". + * + * There's some repetition because of this; keep the functions in sync. + */ + +DUK_EXTERNAL duk_idx_t duk_normalize_index(duk_hthread *thr, duk_idx_t idx) { + duk_uidx_t vs_size; + duk_uidx_t uidx; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + /* Care must be taken to avoid pointer wrapping in the index + * validation. For instance, on a 32-bit platform with 8-byte + * duk_tval the index 0x20000000UL would wrap the memory space + * once. + */ + + /* Assume value stack sizes (in elements) fits into duk_idx_t. */ + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + vs_size = (duk_uidx_t) (thr->valstack_top - thr->valstack_bottom); + DUK_ASSERT_DISABLE(vs_size >= 0); /* unsigned */ + + if (idx < 0) { + uidx = vs_size + (duk_uidx_t) idx; + } else { + /* since index non-negative */ + DUK_ASSERT(idx != DUK_INVALID_INDEX); + uidx = (duk_uidx_t) idx; + } + + /* DUK_INVALID_INDEX won't be accepted as a valid index. */ + DUK_ASSERT(vs_size + (duk_uidx_t) DUK_INVALID_INDEX >= vs_size); + + if (DUK_LIKELY(uidx < vs_size)) { + return (duk_idx_t) uidx; + } + return DUK_INVALID_INDEX; +} + +DUK_EXTERNAL duk_idx_t duk_require_normalize_index(duk_hthread *thr, duk_idx_t idx) { + duk_uidx_t vs_size; + duk_uidx_t uidx; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + vs_size = (duk_uidx_t) (thr->valstack_top - thr->valstack_bottom); + DUK_ASSERT_DISABLE(vs_size >= 0); /* unsigned */ + + if (idx < 0) { + uidx = vs_size + (duk_uidx_t) idx; + } else { + DUK_ASSERT(idx != DUK_INVALID_INDEX); + uidx = (duk_uidx_t) idx; + } + + /* DUK_INVALID_INDEX won't be accepted as a valid index. */ + DUK_ASSERT(vs_size + (duk_uidx_t) DUK_INVALID_INDEX >= vs_size); + + if (DUK_LIKELY(uidx < vs_size)) { + return (duk_idx_t) uidx; + } + DUK_ERROR_RANGE_INDEX(thr, idx); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_tval *duk_get_tval(duk_hthread *thr, duk_idx_t idx) { + duk_uidx_t vs_size; + duk_uidx_t uidx; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + vs_size = (duk_uidx_t) (thr->valstack_top - thr->valstack_bottom); + DUK_ASSERT_DISABLE(vs_size >= 0); /* unsigned */ + + if (idx < 0) { + uidx = vs_size + (duk_uidx_t) idx; + } else { + DUK_ASSERT(idx != DUK_INVALID_INDEX); + uidx = (duk_uidx_t) idx; + } + + /* DUK_INVALID_INDEX won't be accepted as a valid index. */ + DUK_ASSERT(vs_size + (duk_uidx_t) DUK_INVALID_INDEX >= vs_size); + + if (DUK_LIKELY(uidx < vs_size)) { + return thr->valstack_bottom + uidx; + } + return NULL; +} + +/* Variant of duk_get_tval() which is guaranteed to return a valid duk_tval + * pointer. When duk_get_tval() would return NULL, this variant returns a + * pointer to a duk_tval with tag DUK_TAG_UNUSED. This allows the call site + * to avoid an unnecessary NULL check which sometimes leads to better code. + * The return duk_tval is read only (at least for the UNUSED value). + */ +DUK_LOCAL const duk_tval_unused duk__const_tval_unused = DUK_TVAL_UNUSED_INITIALIZER(); + +DUK_INTERNAL duk_tval *duk_get_tval_or_unused(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval(thr, idx); + if (tv != NULL) { + return tv; + } + return (duk_tval *) DUK_LOSE_CONST(&duk__const_tval_unused); +} + +DUK_INTERNAL duk_tval *duk_require_tval(duk_hthread *thr, duk_idx_t idx) { + duk_uidx_t vs_size; + duk_uidx_t uidx; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + vs_size = (duk_uidx_t) (thr->valstack_top - thr->valstack_bottom); + DUK_ASSERT_DISABLE(vs_size >= 0); /* unsigned */ + + /* Use unsigned arithmetic to optimize comparison. */ + if (idx < 0) { + uidx = vs_size + (duk_uidx_t) idx; + } else { + DUK_ASSERT(idx != DUK_INVALID_INDEX); + uidx = (duk_uidx_t) idx; + } + + /* DUK_INVALID_INDEX won't be accepted as a valid index. */ + DUK_ASSERT(vs_size + (duk_uidx_t) DUK_INVALID_INDEX >= vs_size); + + if (DUK_LIKELY(uidx < vs_size)) { + return thr->valstack_bottom + uidx; + } + DUK_ERROR_RANGE_INDEX(thr, idx); + DUK_WO_NORETURN(return NULL;); +} + +/* Non-critical. */ +DUK_EXTERNAL duk_bool_t duk_is_valid_index(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + return (duk_normalize_index(thr, idx) >= 0); +} + +/* Non-critical. */ +DUK_EXTERNAL void duk_require_valid_index(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + if (DUK_UNLIKELY(duk_normalize_index(thr, idx) < 0)) { + DUK_ERROR_RANGE_INDEX(thr, idx); + DUK_WO_NORETURN(return;); + } +} + +/* + * Value stack top handling + */ + +DUK_EXTERNAL duk_idx_t duk_get_top(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); +} + +/* Internal helper to get current top but to require a minimum top value + * (TypeError if not met). + */ +DUK_INTERNAL duk_idx_t duk_get_top_require_min(duk_hthread *thr, duk_idx_t min_top) { + duk_idx_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + if (DUK_UNLIKELY(ret < min_top)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); + } + return ret; +} + +/* Set stack top within currently allocated range, but don't reallocate. + * This is performance critical especially for call handling, so whenever + * changing, profile and look at generated code. + */ +DUK_EXTERNAL void duk_set_top(duk_hthread *thr, duk_idx_t idx) { + duk_uidx_t vs_size; + duk_uidx_t vs_limit; + duk_uidx_t uidx; + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_INVALID_INDEX < 0); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_bottom); + vs_size = (duk_uidx_t) (thr->valstack_top - thr->valstack_bottom); + vs_limit = (duk_uidx_t) (thr->valstack_end - thr->valstack_bottom); + + if (idx < 0) { + /* Negative indices are always within allocated stack but + * must not go below zero index. + */ + uidx = vs_size + (duk_uidx_t) idx; + } else { + /* Positive index can be higher than valstack top but must + * not go above allocated stack (equality is OK). + */ + uidx = (duk_uidx_t) idx; + } + + /* DUK_INVALID_INDEX won't be accepted as a valid index. */ + DUK_ASSERT(vs_size + (duk_uidx_t) DUK_INVALID_INDEX >= vs_size); + DUK_ASSERT(vs_size + (duk_uidx_t) DUK_INVALID_INDEX >= vs_limit); + +#if defined(DUK_USE_VALSTACK_UNSAFE) + DUK_ASSERT(uidx <= vs_limit); + DUK_UNREF(vs_limit); +#else + if (DUK_UNLIKELY(uidx > vs_limit)) { + DUK_ERROR_RANGE_INDEX(thr, idx); + DUK_WO_NORETURN(return;); + } +#endif + DUK_ASSERT(uidx <= vs_limit); + + /* Handle change in value stack top. Respect value stack + * initialization policy: 'undefined' above top. Note that + * DECREF may cause a side effect that reallocates valstack, + * so must relookup after DECREF. + */ + + if (uidx >= vs_size) { + /* Stack size increases or stays the same. */ +#if defined(DUK_USE_ASSERTIONS) + duk_uidx_t count; + + count = uidx - vs_size; + while (count != 0) { + count--; + tv = thr->valstack_top + count; + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); + } +#endif + thr->valstack_top = thr->valstack_bottom + uidx; + } else { + /* Stack size decreases. */ +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_uidx_t count; + duk_tval *tv_end; + + count = vs_size - uidx; + DUK_ASSERT(count > 0); + tv = thr->valstack_top; + tv_end = tv - count; + DUK_ASSERT(tv > tv_end); /* Because count > 0. */ + do { + tv--; + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, tv); + } while (tv != tv_end); + thr->valstack_top = tv_end; + DUK_REFZERO_CHECK_FAST(thr); +#else /* DUK_USE_REFERENCE_COUNTING */ + duk_uidx_t count; + duk_tval *tv_end; + + count = vs_size - uidx; + tv = thr->valstack_top; + tv_end = tv - count; + DUK_ASSERT(tv > tv_end); + do { + tv--; + DUK_TVAL_SET_UNDEFINED(tv); + } while (tv != tv_end); + thr->valstack_top = tv_end; +#endif /* DUK_USE_REFERENCE_COUNTING */ + } +} + +/* Internal variant with a non-negative index and no runtime size checks. */ +#if defined(DUK_USE_PREFER_SIZE) +DUK_INTERNAL void duk_set_top_unsafe(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + duk_set_top(thr, idx); +} +#else /* DUK_USE_PREFER_SIZE */ +DUK_INTERNAL void duk_set_top_unsafe(duk_hthread *thr, duk_idx_t idx) { + duk_uidx_t uidx; + duk_uidx_t vs_size; + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_bottom); + DUK_ASSERT(idx >= 0); + DUK_ASSERT(idx <= (duk_idx_t) (thr->valstack_end - thr->valstack_bottom)); + + /* XXX: byte arithmetic */ + uidx = (duk_uidx_t) idx; + vs_size = (duk_uidx_t) (thr->valstack_top - thr->valstack_bottom); + + if (uidx >= vs_size) { + /* Stack size increases or stays the same. */ +#if defined(DUK_USE_ASSERTIONS) + duk_uidx_t count; + + count = uidx - vs_size; + while (count != 0) { + count--; + tv = thr->valstack_top + count; + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); + } +#endif + thr->valstack_top = thr->valstack_bottom + uidx; + } else { + /* Stack size decreases. */ +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_uidx_t count; + duk_tval *tv_end; + + count = vs_size - uidx; + DUK_ASSERT(count > 0); + tv = thr->valstack_top; + tv_end = tv - count; + DUK_ASSERT(tv > tv_end); /* Because count > 0. */ + do { + tv--; + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, tv); + } while (tv != tv_end); + thr->valstack_top = tv_end; + DUK_REFZERO_CHECK_FAST(thr); +#else /* DUK_USE_REFERENCE_COUNTING */ + duk_uidx_t count; + duk_tval *tv_end; + + count = vs_size - uidx; + tv = thr->valstack_top; + tv_end = tv - count; + DUK_ASSERT(tv > tv_end); + do { + tv--; + DUK_TVAL_SET_UNDEFINED(tv); + } while (tv != tv_end); + thr->valstack_top = tv_end; +#endif /* DUK_USE_REFERENCE_COUNTING */ + } +} +#endif /* DUK_USE_PREFER_SIZE */ + +/* Internal helper: set top to 'top', and set [idx_wipe_start,top[ to + * 'undefined' (doing nothing if idx_wipe_start == top). Indices are + * positive and within value stack reserve. This is used by call handling. + */ +DUK_INTERNAL void duk_set_top_and_wipe(duk_hthread *thr, duk_idx_t top, duk_idx_t idx_wipe_start) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(top >= 0); + DUK_ASSERT(idx_wipe_start >= 0); + DUK_ASSERT(idx_wipe_start <= top); + DUK_ASSERT(thr->valstack_bottom + top <= thr->valstack_end); + DUK_ASSERT(thr->valstack_bottom + idx_wipe_start <= thr->valstack_end); + + duk_set_top_unsafe(thr, idx_wipe_start); + duk_set_top_unsafe(thr, top); +} + +DUK_EXTERNAL duk_idx_t duk_get_top_index(duk_hthread *thr) { + duk_idx_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom) - 1; + if (DUK_UNLIKELY(ret < 0)) { + /* Return invalid index; if caller uses this without checking + * in another API call, the index won't map to a valid stack + * entry. + */ + return DUK_INVALID_INDEX; + } + return ret; +} + +/* Internal variant: call assumes there is at least one element on the value + * stack frame; this is only asserted for. + */ +DUK_INTERNAL duk_idx_t duk_get_top_index_unsafe(duk_hthread *thr) { + duk_idx_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom) - 1; + return ret; +} + +DUK_EXTERNAL duk_idx_t duk_require_top_index(duk_hthread *thr) { + duk_idx_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom) - 1; + if (DUK_UNLIKELY(ret < 0)) { + DUK_ERROR_RANGE_INDEX(thr, -1); + DUK_WO_NORETURN(return 0;); + } + return ret; +} + +/* + * Value stack resizing. + * + * This resizing happens above the current "top": the value stack can be + * grown or shrunk, but the "top" is not affected. The value stack cannot + * be resized to a size below the current reserve. + * + * The low level reallocation primitive must carefully recompute all value + * stack pointers, and must also work if ALL pointers are NULL. The resize + * is quite tricky because the valstack realloc may cause a mark-and-sweep, + * which may run finalizers. Running finalizers may resize the valstack + * recursively (the same value stack we're working on). So, after realloc + * returns, we know that the valstack bottom, top, and reserve should still + * be the same (there should not be live values above the "top"), but its + * underlying size, alloc_end, and base pointer may have changed. + * + * 'new_size' is known to be <= DUK_USE_VALSTACK_LIMIT, which ensures that + * size_t and pointer arithmetic won't wrap in duk__resize_valstack(). + */ + +/* Low level valstack resize primitive, used for both grow and shrink. All + * adjustments for slack etc have already been done. Doesn't throw but does + * have allocation side effects. + */ +DUK_LOCAL DUK_COLD DUK_NOINLINE duk_bool_t duk__resize_valstack(duk_hthread *thr, duk_size_t new_size) { + duk_tval *pre_valstack; + duk_tval *pre_bottom; + duk_tval *pre_top; + duk_tval *pre_end; + duk_tval *pre_alloc_end; + duk_ptrdiff_t ptr_diff; + duk_tval *new_valstack; + duk_size_t new_alloc_size; + duk_tval *tv_prev_alloc_end; + duk_tval *p; + + DUK_ASSERT_HTHREAD_VALID(thr); + DUK_ASSERT(thr->valstack_bottom >= thr->valstack); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_top); + DUK_ASSERT(thr->valstack_alloc_end >= thr->valstack_end); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack) <= new_size); /* can't resize below 'top' */ + DUK_ASSERT(new_size <= DUK_USE_VALSTACK_LIMIT); /* valstack limit caller has check, prevents wrapping */ + DUK_ASSERT(new_size <= DUK_SIZE_MAX / sizeof(duk_tval)); /* specific assert for wrapping */ + + /* Pre-realloc pointer copies for asserts and debug logs. */ + pre_valstack = thr->valstack; + pre_bottom = thr->valstack_bottom; + pre_top = thr->valstack_top; + pre_end = thr->valstack_end; + pre_alloc_end = thr->valstack_alloc_end; + + DUK_UNREF(pre_valstack); + DUK_UNREF(pre_bottom); + DUK_UNREF(pre_top); + DUK_UNREF(pre_end); + DUK_UNREF(pre_alloc_end); + + /* If finalizer torture enabled, force base pointer change every time + * when it would be allowed. + */ +#if defined(DUK_USE_FINALIZER_TORTURE) + if (thr->heap->pf_prevent_count == 0) { + duk_hthread_valstack_torture_realloc(thr); + } +#endif + + /* Allocate a new valstack using DUK_REALLOC_DIRECT() to deal with + * a side effect changing the base pointer. + */ + new_alloc_size = sizeof(duk_tval) * new_size; + new_valstack = (duk_tval *) DUK_REALLOC_INDIRECT(thr->heap, duk_hthread_get_valstack_ptr, (void *) thr, new_alloc_size); + if (DUK_UNLIKELY(new_valstack == NULL)) { + /* Because new_size != 0, if condition doesn't need to be + * (new_valstack != NULL || new_size == 0). + */ + DUK_ASSERT(new_size != 0); + DUK_D(DUK_DPRINT("failed to resize valstack to %lu entries (%lu bytes)", + (unsigned long) new_size, (unsigned long) new_alloc_size)); + return 0; + } + + /* Debug log any changes in pointer(s) by side effects. These don't + * necessarily imply any incorrect behavior, but should be rare in + * practice. + */ +#if defined(DUK_USE_DEBUG) + if (thr->valstack != pre_valstack) { + DUK_D(DUK_DPRINT("valstack base pointer changed during valstack resize: %p -> %p", + (void *) pre_valstack, (void *) thr->valstack)); + } + if (thr->valstack_bottom != pre_bottom) { + DUK_D(DUK_DPRINT("valstack bottom pointer changed during valstack resize: %p -> %p", + (void *) pre_bottom, (void *) thr->valstack_bottom)); + } + if (thr->valstack_top != pre_top) { + DUK_D(DUK_DPRINT("valstack top pointer changed during valstack resize: %p -> %p", + (void *) pre_top, (void *) thr->valstack_top)); + } + if (thr->valstack_end != pre_end) { + DUK_D(DUK_DPRINT("valstack end pointer changed during valstack resize: %p -> %p", + (void *) pre_end, (void *) thr->valstack_end)); + } + if (thr->valstack_alloc_end != pre_alloc_end) { + DUK_D(DUK_DPRINT("valstack alloc_end pointer changed during valstack resize: %p -> %p", + (void *) pre_alloc_end, (void *) thr->valstack_alloc_end)); + } +#endif + + /* Assertions: offsets for bottom, top, and end (reserve) must not + * have changed even with side effects because they are always + * restored in unwind. For alloc_end there's no guarantee: it may + * have grown or shrunk (but remain above 'end'). + */ + DUK_ASSERT(thr->valstack_bottom - thr->valstack == pre_bottom - pre_valstack); + DUK_ASSERT(thr->valstack_top - thr->valstack == pre_top - pre_valstack); + DUK_ASSERT(thr->valstack_end - thr->valstack == pre_end - pre_valstack); + DUK_ASSERT(thr->valstack_alloc_end >= thr->valstack_end); + + /* Write new pointers. Most pointers can be handled as a pointer + * difference. + */ + ptr_diff = (duk_ptrdiff_t) ((duk_uint8_t *) new_valstack - (duk_uint8_t *) thr->valstack); + tv_prev_alloc_end = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_alloc_end + ptr_diff); + thr->valstack = new_valstack; + thr->valstack_bottom = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_bottom + ptr_diff); + thr->valstack_top = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_top + ptr_diff); + thr->valstack_end = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_end + ptr_diff); + thr->valstack_alloc_end = (duk_tval *) (void *) ((duk_uint8_t *) new_valstack + new_alloc_size); + + /* Assertions: pointer sanity after pointer updates. */ + DUK_ASSERT(thr->valstack_bottom >= thr->valstack); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_top); + DUK_ASSERT(thr->valstack_alloc_end >= thr->valstack_end); + + DUK_D(DUK_DPRINT("resized valstack %lu -> %lu elements (%lu -> %lu bytes): " + "base=%p -> %p, bottom=%p -> %p (%ld), top=%p -> %p (%ld), " + "end=%p -> %p (%ld), alloc_end=%p -> %p (%ld);" + " tv_prev_alloc_end=%p (-> %ld inits; <0 means shrink)", + (unsigned long) (pre_alloc_end - pre_valstack), + (unsigned long) new_size, + (unsigned long) ((duk_uint8_t *) pre_alloc_end - (duk_uint8_t *) pre_valstack), + (unsigned long) new_alloc_size, + (void *) pre_valstack, (void *) thr->valstack, + (void *) pre_bottom, (void *) thr->valstack_bottom, (long) (thr->valstack_bottom - thr->valstack), + (void *) pre_top, (void *) thr->valstack_top, (long) (thr->valstack_top - thr->valstack), + (void *) pre_end, (void *) thr->valstack_end, (long) (thr->valstack_end - thr->valstack), + (void *) pre_alloc_end, (void *) thr->valstack_alloc_end, (long) (thr->valstack_alloc_end - thr->valstack), + (void *) tv_prev_alloc_end, (long) (thr->valstack_alloc_end - tv_prev_alloc_end))); + + /* If allocation grew, init any new slots to 'undefined'. */ + p = tv_prev_alloc_end; + while (p < thr->valstack_alloc_end) { + /* Never executed if new size is smaller. */ + DUK_TVAL_SET_UNDEFINED(p); + p++; + } + + /* Assert for value stack initialization policy. */ +#if defined(DUK_USE_ASSERTIONS) + p = thr->valstack_top; + while (p < thr->valstack_alloc_end) { + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(p)); + p++; + } +#endif + + return 1; +} + +DUK_LOCAL DUK_COLD DUK_NOINLINE duk_bool_t duk__valstack_grow(duk_hthread *thr, duk_size_t min_bytes, duk_bool_t throw_on_error) { + duk_size_t min_size; + duk_size_t new_size; + + DUK_ASSERT(min_bytes / sizeof(duk_tval) * sizeof(duk_tval) == min_bytes); + min_size = min_bytes / sizeof(duk_tval); /* from bytes to slots */ + +#if defined(DUK_USE_VALSTACK_GROW_SHIFT) + /* New size is minimum size plus a proportional slack, e.g. shift of + * 2 means a 25% slack. + */ + new_size = min_size + (min_size >> DUK_USE_VALSTACK_GROW_SHIFT); +#else + /* New size is tight with no slack. This is sometimes preferred in + * low memory environments. + */ + new_size = min_size; +#endif + + if (DUK_UNLIKELY(new_size > DUK_USE_VALSTACK_LIMIT || new_size < min_size /*wrap*/)) { + /* Note: may be triggered even if minimal new_size would not reach the limit, + * plan limit accordingly. + */ + if (throw_on_error) { + DUK_ERROR_RANGE(thr, DUK_STR_VALSTACK_LIMIT); + DUK_WO_NORETURN(return 0;); + } + return 0; + } + + if (duk__resize_valstack(thr, new_size) == 0) { + if (throw_on_error) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return 0;); + } + return 0; + } + + thr->valstack_end = thr->valstack + min_size; + DUK_ASSERT(thr->valstack_alloc_end >= thr->valstack_end); + + return 1; +} + +/* Hot, inlined value stack grow check. Because value stack almost never + * grows, the actual resize call is in a NOINLINE helper. + */ +DUK_INTERNAL DUK_INLINE void duk_valstack_grow_check_throw(duk_hthread *thr, duk_size_t min_bytes) { + duk_tval *tv; + + tv = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + min_bytes); + if (DUK_LIKELY(thr->valstack_end >= tv)) { + return; + } + if (DUK_LIKELY(thr->valstack_alloc_end >= tv)) { + /* Values in [valstack_top,valstack_alloc_end[ are initialized + * to 'undefined' so we can just move the end pointer. + */ + thr->valstack_end = tv; + return; + } + (void) duk__valstack_grow(thr, min_bytes, 1 /*throw_on_error*/); +} + +/* Hot, inlined value stack grow check which doesn't throw. */ +DUK_INTERNAL DUK_INLINE duk_bool_t duk_valstack_grow_check_nothrow(duk_hthread *thr, duk_size_t min_bytes) { + duk_tval *tv; + + tv = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + min_bytes); + if (DUK_LIKELY(thr->valstack_end >= tv)) { + return 1; + } + if (DUK_LIKELY(thr->valstack_alloc_end >= tv)) { + thr->valstack_end = tv; + return 1; + } + return duk__valstack_grow(thr, min_bytes, 0 /*throw_on_error*/); +} + +/* Value stack shrink check, called from mark-and-sweep. */ +DUK_INTERNAL void duk_valstack_shrink_check_nothrow(duk_hthread *thr, duk_bool_t snug) { + duk_size_t alloc_bytes; + duk_size_t reserve_bytes; + duk_size_t shrink_bytes; + + alloc_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_alloc_end - (duk_uint8_t *) thr->valstack); + reserve_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack); + DUK_ASSERT(alloc_bytes >= reserve_bytes); + + /* We're free to shrink the value stack allocation down to + * reserve_bytes but not more. If 'snug' (emergency GC) + * shrink whatever we can. Otherwise only shrink if the new + * size would be considerably smaller. + */ + +#if defined(DUK_USE_VALSTACK_SHRINK_CHECK_SHIFT) + if (snug) { + shrink_bytes = reserve_bytes; + } else { + duk_size_t proportion, slack; + + /* Require that value stack shrinks by at least X% of its + * current size. For example, shift of 2 means at least + * 25%. The proportion is computed as bytes and may not + * be a multiple of sizeof(duk_tval); that's OK here. + */ + proportion = alloc_bytes >> DUK_USE_VALSTACK_SHRINK_CHECK_SHIFT; + if (alloc_bytes - reserve_bytes < proportion) { + /* Too little would be freed, do nothing. */ + return; + } + + /* Keep a slack after shrinking. The slack is again a + * proportion of the current size (the proportion should + * of course be smaller than the check proportion above). + */ +#if defined(DUK_USE_VALSTACK_SHRINK_SLACK_SHIFT) + DUK_ASSERT(DUK_USE_VALSTACK_SHRINK_SLACK_SHIFT > DUK_USE_VALSTACK_SHRINK_CHECK_SHIFT); + slack = alloc_bytes >> DUK_USE_VALSTACK_SHRINK_SLACK_SHIFT; +#else + slack = 0; +#endif + shrink_bytes = reserve_bytes + + slack / sizeof(duk_tval) * sizeof(duk_tval); /* multiple of duk_tval */ + } +#else /* DUK_USE_VALSTACK_SHRINK_CHECK_SHIFT */ + /* Always snug, useful in some low memory environments. */ + DUK_UNREF(snug); + shrink_bytes = reserve_bytes; +#endif /* DUK_USE_VALSTACK_SHRINK_CHECK_SHIFT */ + + DUK_D(DUK_DPRINT("valstack shrink check: alloc_bytes=%ld, reserve_bytes=%ld, shrink_bytes=%ld (unvalidated)", + (long) alloc_bytes, (long) reserve_bytes, (long) shrink_bytes)); + DUK_ASSERT(shrink_bytes >= reserve_bytes); + if (shrink_bytes >= alloc_bytes) { + /* Skip if shrink target is same as current one (or higher, + * though that shouldn't happen in practice). + */ + return; + } + DUK_ASSERT(shrink_bytes / sizeof(duk_tval) * sizeof(duk_tval) == shrink_bytes); + + DUK_D(DUK_DPRINT("valstack shrink check: decided to shrink, snug: %ld", (long) snug)); + + duk__resize_valstack(thr, shrink_bytes / sizeof(duk_tval)); +} + +DUK_EXTERNAL duk_bool_t duk_check_stack(duk_hthread *thr, duk_idx_t extra) { + duk_size_t min_new_bytes; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr != NULL); + + if (DUK_UNLIKELY(extra < 0 || extra > DUK_USE_VALSTACK_LIMIT)) { + if (extra < 0) { + /* Clamping to zero makes the API more robust to calling code + * calculation errors. + */ + extra = 0; + } else { + /* Cause grow check to fail without wrapping arithmetic. */ + extra = DUK_USE_VALSTACK_LIMIT; + } + } + + min_new_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - (duk_uint8_t *) thr->valstack) + + sizeof(duk_tval) * ((duk_size_t) extra + DUK_VALSTACK_INTERNAL_EXTRA); + return duk_valstack_grow_check_nothrow(thr, min_new_bytes); +} + +DUK_EXTERNAL void duk_require_stack(duk_hthread *thr, duk_idx_t extra) { + duk_size_t min_new_bytes; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr != NULL); + + if (DUK_UNLIKELY(extra < 0 || extra > DUK_USE_VALSTACK_LIMIT)) { + if (extra < 0) { + /* Clamping to zero makes the API more robust to calling code + * calculation errors. + */ + extra = 0; + } else { + /* Cause grow check to fail without wrapping arithmetic. */ + extra = DUK_USE_VALSTACK_LIMIT; + } + } + + min_new_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - (duk_uint8_t *) thr->valstack) + + sizeof(duk_tval) * ((duk_size_t) extra + DUK_VALSTACK_INTERNAL_EXTRA); + duk_valstack_grow_check_throw(thr, min_new_bytes); +} + +DUK_EXTERNAL duk_bool_t duk_check_stack_top(duk_hthread *thr, duk_idx_t top) { + duk_size_t min_new_bytes; + + DUK_ASSERT_API_ENTRY(thr); + + if (DUK_UNLIKELY(top < 0 || top > DUK_USE_VALSTACK_LIMIT)) { + if (top < 0) { + /* Clamping to zero makes the API more robust to calling code + * calculation errors. + */ + top = 0; + } else { + /* Cause grow check to fail without wrapping arithmetic. */ + top = DUK_USE_VALSTACK_LIMIT; + } + } + + DUK_ASSERT(top >= 0); + min_new_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack) + + sizeof(duk_tval) * ((duk_size_t) top + DUK_VALSTACK_INTERNAL_EXTRA); + return duk_valstack_grow_check_nothrow(thr, min_new_bytes); +} + +DUK_EXTERNAL void duk_require_stack_top(duk_hthread *thr, duk_idx_t top) { + duk_size_t min_new_bytes; + + DUK_ASSERT_API_ENTRY(thr); + + if (DUK_UNLIKELY(top < 0 || top > DUK_USE_VALSTACK_LIMIT)) { + if (top < 0) { + /* Clamping to zero makes the API more robust to calling code + * calculation errors. + */ + top = 0; + } else { + /* Cause grow check to fail without wrapping arithmetic. */ + top = DUK_USE_VALSTACK_LIMIT; + } + } + + DUK_ASSERT(top >= 0); + min_new_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack) + + sizeof(duk_tval) * ((duk_size_t) top + DUK_VALSTACK_INTERNAL_EXTRA); + duk_valstack_grow_check_throw(thr, min_new_bytes); +} + +/* + * Basic stack manipulation: swap, dup, insert, replace, etc + */ + +DUK_EXTERNAL void duk_swap(duk_hthread *thr, duk_idx_t idx1, duk_idx_t idx2) { + duk_tval *tv1; + duk_tval *tv2; + duk_tval tv_tmp; + + DUK_ASSERT_API_ENTRY(thr); + + tv1 = duk_require_tval(thr, idx1); + DUK_ASSERT(tv1 != NULL); + tv2 = duk_require_tval(thr, idx2); + DUK_ASSERT(tv2 != NULL); + + /* If tv1==tv2 this is a NOP, no check is needed */ + DUK_TVAL_SET_TVAL(&tv_tmp, tv1); + DUK_TVAL_SET_TVAL(tv1, tv2); + DUK_TVAL_SET_TVAL(tv2, &tv_tmp); +} + +DUK_EXTERNAL void duk_swap_top(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + duk_swap(thr, idx, -1); +} + +DUK_EXTERNAL void duk_dup(duk_hthread *thr, duk_idx_t from_idx) { + duk_tval *tv_from; + duk_tval *tv_to; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + + tv_from = duk_require_tval(thr, from_idx); + tv_to = thr->valstack_top++; + DUK_ASSERT(tv_from != NULL); + DUK_ASSERT(tv_to != NULL); + DUK_TVAL_SET_TVAL(tv_to, tv_from); + DUK_TVAL_INCREF(thr, tv_to); /* no side effects */ +} + +DUK_EXTERNAL void duk_dup_top(duk_hthread *thr) { +#if defined(DUK_USE_PREFER_SIZE) + duk_dup(thr, -1); +#else + duk_tval *tv_from; + duk_tval *tv_to; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + + if (DUK_UNLIKELY(thr->valstack_top - thr->valstack_bottom <= 0)) { + DUK_ERROR_RANGE_INDEX(thr, -1); + DUK_WO_NORETURN(return;); + } + tv_from = thr->valstack_top - 1; + tv_to = thr->valstack_top++; + DUK_ASSERT(tv_from != NULL); + DUK_ASSERT(tv_to != NULL); + DUK_TVAL_SET_TVAL(tv_to, tv_from); + DUK_TVAL_INCREF(thr, tv_to); /* no side effects */ +#endif +} + +DUK_INTERNAL void duk_dup_0(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_dup(thr, 0); +} +DUK_INTERNAL void duk_dup_1(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_dup(thr, 1); +} +DUK_INTERNAL void duk_dup_2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_dup(thr, 2); +} +DUK_INTERNAL void duk_dup_m2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_dup(thr, -2); +} +DUK_INTERNAL void duk_dup_m3(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_dup(thr, -3); +} +DUK_INTERNAL void duk_dup_m4(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_dup(thr, -4); +} + +DUK_EXTERNAL void duk_insert(duk_hthread *thr, duk_idx_t to_idx) { + duk_tval *p; + duk_tval *q; + duk_tval tv_tmp; + duk_size_t nbytes; + + DUK_ASSERT_API_ENTRY(thr); + + p = duk_require_tval(thr, to_idx); + DUK_ASSERT(p != NULL); + q = duk_require_tval(thr, -1); + DUK_ASSERT(q != NULL); + + DUK_ASSERT(q >= p); + + /* nbytes + * <---------> + * [ ... | p | x | x | q ] + * => [ ... | q | p | x | x ] + */ + + nbytes = (duk_size_t) (((duk_uint8_t *) q) - ((duk_uint8_t *) p)); /* Note: 'q' is top-1 */ + + DUK_DDD(DUK_DDDPRINT("duk_insert: to_idx=%ld, p=%p, q=%p, nbytes=%lu", + (long) to_idx, (void *) p, (void *) q, (unsigned long) nbytes)); + + /* No net refcount changes. No need to special case nbytes == 0 + * (p == q). + */ + DUK_TVAL_SET_TVAL(&tv_tmp, q); + duk_memmove((void *) (p + 1), (const void *) p, (size_t) nbytes); + DUK_TVAL_SET_TVAL(p, &tv_tmp); +} + +DUK_INTERNAL void duk_insert_undefined(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(idx >= 0); /* Doesn't support negative indices. */ + + duk_push_undefined(thr); + duk_insert(thr, idx); +} + +DUK_INTERNAL void duk_insert_undefined_n(duk_hthread *thr, duk_idx_t idx, duk_idx_t count) { + duk_tval *tv, *tv_end; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(idx >= 0); /* Doesn't support negative indices or count. */ + DUK_ASSERT(count >= 0); + + tv = duk_reserve_gap(thr, idx, count); + tv_end = tv + count; + while (tv != tv_end) { + DUK_TVAL_SET_UNDEFINED(tv); + tv++; + } +} + +DUK_EXTERNAL void duk_replace(duk_hthread *thr, duk_idx_t to_idx) { + duk_tval *tv1; + duk_tval *tv2; + duk_tval tv_tmp; + + DUK_ASSERT_API_ENTRY(thr); + + tv1 = duk_require_tval(thr, -1); + DUK_ASSERT(tv1 != NULL); + tv2 = duk_require_tval(thr, to_idx); + DUK_ASSERT(tv2 != NULL); + + /* For tv1 == tv2, both pointing to stack top, the end result + * is same as duk_pop(thr). + */ + DUK_TVAL_SET_TVAL(&tv_tmp, tv2); + DUK_TVAL_SET_TVAL(tv2, tv1); + DUK_TVAL_SET_UNDEFINED(tv1); + thr->valstack_top--; + DUK_TVAL_DECREF(thr, &tv_tmp); /* side effects */ +} + +DUK_EXTERNAL void duk_copy(duk_hthread *thr, duk_idx_t from_idx, duk_idx_t to_idx) { + duk_tval *tv1; + duk_tval *tv2; + + DUK_ASSERT_API_ENTRY(thr); + + tv1 = duk_require_tval(thr, from_idx); + DUK_ASSERT(tv1 != NULL); + tv2 = duk_require_tval(thr, to_idx); + DUK_ASSERT(tv2 != NULL); + + /* For tv1 == tv2, this is a no-op (no explicit check needed). */ + DUK_TVAL_SET_TVAL_UPDREF(thr, tv2, tv1); /* side effects */ +} + +DUK_EXTERNAL void duk_remove(duk_hthread *thr, duk_idx_t idx) { + duk_tval *p; + duk_tval *q; +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_tval tv_tmp; +#endif + duk_size_t nbytes; + + DUK_ASSERT_API_ENTRY(thr); + + p = duk_require_tval(thr, idx); + DUK_ASSERT(p != NULL); + q = duk_require_tval(thr, -1); + DUK_ASSERT(q != NULL); + + DUK_ASSERT(q >= p); + + /* nbytes zero size case + * <---------> + * [ ... | p | x | x | q ] [ ... | p==q ] + * => [ ... | x | x | q ] [ ... ] + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + /* use a temp: decref only when valstack reachable values are correct */ + DUK_TVAL_SET_TVAL(&tv_tmp, p); +#endif + + nbytes = (duk_size_t) (((duk_uint8_t *) q) - ((duk_uint8_t *) p)); /* Note: 'q' is top-1 */ + duk_memmove((void *) p, (const void *) (p + 1), (size_t) nbytes); + + DUK_TVAL_SET_UNDEFINED(q); + thr->valstack_top--; + +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_TVAL_DECREF(thr, &tv_tmp); /* side effects */ +#endif +} + +DUK_INTERNAL void duk_remove_unsafe(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + duk_remove(thr, idx); /* XXX: no optimization for now */ +} + +DUK_INTERNAL void duk_remove_m2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + duk_remove(thr, -2); +} + +DUK_INTERNAL void duk_remove_n(duk_hthread *thr, duk_idx_t idx, duk_idx_t count) { +#if defined(DUK_USE_PREFER_SIZE) + /* XXX: maybe too slow even when preferring size? */ + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(count >= 0); + DUK_ASSERT(idx >= 0); + + while (count-- > 0) { + duk_remove(thr, idx); + } +#else /* DUK_USE_PREFER_SIZE */ + duk_tval *tv_src; + duk_tval *tv_dst; + duk_tval *tv_newtop; + duk_tval *tv; + duk_size_t bytes; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(count >= 0); + DUK_ASSERT(idx >= 0); + + tv_dst = thr->valstack_bottom + idx; + DUK_ASSERT(tv_dst <= thr->valstack_top); + tv_src = tv_dst + count; + DUK_ASSERT(tv_src <= thr->valstack_top); + bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - (duk_uint8_t *) tv_src); + + for (tv = tv_dst; tv < tv_src; tv++) { + DUK_TVAL_DECREF_NORZ(thr, tv); + } + + duk_memmove((void *) tv_dst, (const void *) tv_src, bytes); + + tv_newtop = thr->valstack_top - count; + for (tv = tv_newtop; tv < thr->valstack_top; tv++) { + DUK_TVAL_SET_UNDEFINED(tv); + } + thr->valstack_top = tv_newtop; + + /* When not preferring size, only NORZ macros are used; caller + * is expected to DUK_REFZERO_CHECK(). + */ +#endif /* DUK_USE_PREFER_SIZE */ +} + +DUK_INTERNAL void duk_remove_n_unsafe(duk_hthread *thr, duk_idx_t idx, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + + duk_remove_n(thr, idx, count); /* XXX: no optimization for now */ +} + +/* + * Stack slice primitives + */ + +DUK_EXTERNAL void duk_xcopymove_raw(duk_hthread *to_thr, duk_hthread *from_thr, duk_idx_t count, duk_bool_t is_copy) { + void *src; + duk_size_t nbytes; + duk_tval *p; + duk_tval *q; + + /* XXX: several pointer comparison issues here */ + + DUK_ASSERT_API_ENTRY(to_thr); + DUK_ASSERT_CTX_VALID(to_thr); + DUK_ASSERT_CTX_VALID(from_thr); + DUK_ASSERT(to_thr->heap == from_thr->heap); + + if (DUK_UNLIKELY(to_thr == from_thr)) { + DUK_ERROR_TYPE(to_thr, DUK_STR_INVALID_CONTEXT); + DUK_WO_NORETURN(return;); + } + if (DUK_UNLIKELY((duk_uidx_t) count > (duk_uidx_t) DUK_USE_VALSTACK_LIMIT)) { + /* Maximum value check ensures 'nbytes' won't wrap below. + * Also handles negative count. + */ + DUK_ERROR_RANGE_INVALID_COUNT(to_thr); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(count >= 0); + + nbytes = sizeof(duk_tval) * (duk_size_t) count; + if (DUK_UNLIKELY(nbytes == 0)) { + return; + } + DUK_ASSERT(to_thr->valstack_top <= to_thr->valstack_end); + if (DUK_UNLIKELY((duk_size_t) ((duk_uint8_t *) to_thr->valstack_end - (duk_uint8_t *) to_thr->valstack_top) < nbytes)) { + DUK_ERROR_RANGE_PUSH_BEYOND(to_thr); + DUK_WO_NORETURN(return;); + } + src = (void *) ((duk_uint8_t *) from_thr->valstack_top - nbytes); + if (DUK_UNLIKELY(src < (void *) from_thr->valstack_bottom)) { + DUK_ERROR_RANGE_INVALID_COUNT(to_thr); + DUK_WO_NORETURN(return;); + } + + /* Copy values (no overlap even if to_thr == from_thr; that's not + * allowed now anyway). + */ + DUK_ASSERT(nbytes > 0); + duk_memcpy((void *) to_thr->valstack_top, (const void *) src, (size_t) nbytes); + + p = to_thr->valstack_top; + to_thr->valstack_top = (duk_tval *) (void *) (((duk_uint8_t *) p) + nbytes); + + if (is_copy) { + /* Incref copies, keep originals. */ + q = to_thr->valstack_top; + while (p < q) { + DUK_TVAL_INCREF(to_thr, p); /* no side effects */ + p++; + } + } else { + /* No net refcount change. */ + p = from_thr->valstack_top; + q = (duk_tval *) (void *) (((duk_uint8_t *) p) - nbytes); + from_thr->valstack_top = q; + + while (p > q) { + p--; + DUK_TVAL_SET_UNDEFINED(p); + /* XXX: fast primitive to set a bunch of values to UNDEFINED */ + } + } +} + +/* Internal helper: reserve a gap of 'count' elements at 'idx_base' and return a + * pointer to the gap. Values in the gap are garbage and MUST be initialized by + * the caller before any side effects may occur. The caller must ensure there's + * enough stack reserve for 'count' values. + */ +DUK_INTERNAL duk_tval *duk_reserve_gap(duk_hthread *thr, duk_idx_t idx_base, duk_idx_t count) { + duk_tval *tv_src; + duk_tval *tv_dst; + duk_size_t gap_bytes; + duk_size_t copy_bytes; + + /* Caller is responsible for ensuring there's enough preallocated + * value stack. + */ + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(count >= 0); + DUK_ASSERT((duk_size_t) (thr->valstack_end - thr->valstack_top) >= (duk_size_t) count); + + tv_src = thr->valstack_bottom + idx_base; + gap_bytes = (duk_size_t) count * sizeof(duk_tval); + tv_dst = (duk_tval *) (void *) ((duk_uint8_t *) tv_src + gap_bytes); + copy_bytes = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - (duk_uint8_t *) tv_src); + thr->valstack_top = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_top + gap_bytes); + duk_memmove((void *) tv_dst, (const void *) tv_src, copy_bytes); + + /* Values in the gap are left as garbage: caller must fill them in + * and INCREF them before any side effects. + */ + return tv_src; +} + +/* + * Get/opt/require + */ + +DUK_EXTERNAL void duk_require_undefined(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_UNDEFINED(tv))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "undefined", DUK_STR_NOT_UNDEFINED); + DUK_WO_NORETURN(return;); + } +} + +DUK_EXTERNAL void duk_require_null(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_NULL(tv))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "null", DUK_STR_NOT_NULL); + DUK_WO_NORETURN(return;); + } +} + +DUK_LOCAL DUK_ALWAYS_INLINE duk_bool_t duk__get_boolean_raw(duk_hthread *thr, duk_idx_t idx, duk_bool_t def_value) { + duk_bool_t ret; + duk_tval *tv; + + DUK_ASSERT_CTX_VALID(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_BOOLEAN(tv)) { + ret = DUK_TVAL_GET_BOOLEAN(tv); + DUK_ASSERT(ret == 0 || ret == 1); + } else { + ret = def_value; + /* Not guaranteed to be 0 or 1. */ + } + + return ret; +} + +DUK_EXTERNAL duk_bool_t duk_get_boolean(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return duk__get_boolean_raw(thr, idx, 0); /* default: false */ +} + +DUK_EXTERNAL duk_bool_t duk_get_boolean_default(duk_hthread *thr, duk_idx_t idx, duk_bool_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + return duk__get_boolean_raw(thr, idx, def_value); +} + +DUK_EXTERNAL duk_bool_t duk_require_boolean(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_bool_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_LIKELY(DUK_TVAL_IS_BOOLEAN(tv))) { + ret = DUK_TVAL_GET_BOOLEAN(tv); + DUK_ASSERT(ret == 0 || ret == 1); + return ret; + } else { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "boolean", DUK_STR_NOT_BOOLEAN); + DUK_WO_NORETURN(return 0;); + } +} + +DUK_EXTERNAL duk_bool_t duk_opt_boolean(duk_hthread *thr, duk_idx_t idx, duk_bool_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_boolean(thr, idx); +} + +DUK_LOCAL DUK_ALWAYS_INLINE duk_double_t duk__get_number_raw(duk_hthread *thr, duk_idx_t idx, duk_double_t def_value) { + duk_double_union ret; + duk_tval *tv; + + DUK_ASSERT_CTX_VALID(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + ret.d = (duk_double_t) DUK_TVAL_GET_FASTINT(tv); /* XXX: cast trick */ + } + else +#endif + if (DUK_TVAL_IS_DOUBLE(tv)) { + /* When using packed duk_tval, number must be in NaN-normalized form + * for it to be a duk_tval, so no need to normalize. NOP for unpacked + * duk_tval. + */ + ret.d = DUK_TVAL_GET_DOUBLE(tv); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&ret)); + } else { + ret.d = def_value; + /* Default value (including NaN) may not be normalized. */ + } + + return ret.d; +} + +DUK_EXTERNAL duk_double_t duk_get_number(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_number_raw(thr, idx, DUK_DOUBLE_NAN); /* default: NaN */ +} + +DUK_EXTERNAL duk_double_t duk_get_number_default(duk_hthread *thr, duk_idx_t idx, duk_double_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_number_raw(thr, idx, def_value); +} + +DUK_EXTERNAL duk_double_t duk_require_number(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_double_union ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_NUMBER(tv))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "number", DUK_STR_NOT_NUMBER); + DUK_WO_NORETURN(return 0.0;); + } + + ret.d = DUK_TVAL_GET_NUMBER(tv); + + /* When using packed duk_tval, number must be in NaN-normalized form + * for it to be a duk_tval, so no need to normalize. NOP for unpacked + * duk_tval. + */ + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&ret)); + return ret.d; +} + +DUK_EXTERNAL duk_double_t duk_opt_number(duk_hthread *thr, duk_idx_t idx, duk_double_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + /* User provided default is not NaN normalized. */ + return def_value; + } + return duk_require_number(thr, idx); +} + +DUK_EXTERNAL duk_int_t duk_get_int(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_int_t) duk__api_coerce_d2i(thr, idx, 0 /*def_value*/, 0 /*require*/); +} + +DUK_EXTERNAL duk_uint_t duk_get_uint(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_uint_t) duk__api_coerce_d2ui(thr, idx, 0 /*def_value*/, 0 /*require*/); +} + +DUK_EXTERNAL duk_int_t duk_get_int_default(duk_hthread *thr, duk_idx_t idx, duk_int_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_int_t) duk__api_coerce_d2i(thr, idx, def_value, 0 /*require*/); +} + +DUK_EXTERNAL duk_uint_t duk_get_uint_default(duk_hthread *thr, duk_idx_t idx, duk_uint_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_uint_t) duk__api_coerce_d2ui(thr, idx, def_value, 0 /*require*/); +} + +DUK_EXTERNAL duk_int_t duk_require_int(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_int_t) duk__api_coerce_d2i(thr, idx, 0 /*def_value*/, 1 /*require*/); +} + +DUK_EXTERNAL duk_uint_t duk_require_uint(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_uint_t) duk__api_coerce_d2ui(thr, idx, 0 /*def_value*/, 1 /*require*/); +} + +DUK_EXTERNAL duk_int_t duk_opt_int(duk_hthread *thr, duk_idx_t idx, duk_int_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_int(thr, idx); +} + +DUK_EXTERNAL duk_uint_t duk_opt_uint(duk_hthread *thr, duk_idx_t idx, duk_uint_t def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_uint(thr, idx); +} + +DUK_EXTERNAL const char *duk_get_lstring(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len) { + duk_hstring *h; + const char *ret; + duk_size_t len; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_get_hstring(thr, idx); + if (h != NULL) { + len = DUK_HSTRING_GET_BYTELEN(h); + ret = (const char *) DUK_HSTRING_GET_DATA(h); + } else { + len = 0; + ret = NULL; + } + + if (out_len != NULL) { + *out_len = len; + } + return ret; +} + +DUK_EXTERNAL const char *duk_require_lstring(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_require_hstring(thr, idx); + DUK_ASSERT(h != NULL); + if (out_len) { + *out_len = DUK_HSTRING_GET_BYTELEN(h); + } + return (const char *) DUK_HSTRING_GET_DATA(h); +} + +DUK_INTERNAL const char *duk_require_lstring_notsymbol(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_require_hstring_notsymbol(thr, idx); + DUK_ASSERT(h != NULL); + if (out_len) { + *out_len = DUK_HSTRING_GET_BYTELEN(h); + } + return (const char *) DUK_HSTRING_GET_DATA(h); +} + +DUK_EXTERNAL const char *duk_get_string(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_get_hstring(thr, idx); + if (h != NULL) { + return (const char *) DUK_HSTRING_GET_DATA(h); + } else { + return NULL; + } +} + +DUK_EXTERNAL const char *duk_opt_lstring(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len, const char *def_ptr, duk_size_t def_len) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + if (out_len != NULL) { + *out_len = def_len; + } + return def_ptr; + } + return duk_require_lstring(thr, idx, out_len); +} + +DUK_EXTERNAL const char *duk_opt_string(duk_hthread *thr, duk_idx_t idx, const char *def_ptr) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_ptr; + } + return duk_require_string(thr, idx); +} + +DUK_EXTERNAL const char *duk_get_lstring_default(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len, const char *def_ptr, duk_size_t def_len) { + duk_hstring *h; + const char *ret; + duk_size_t len; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_get_hstring(thr, idx); + if (h != NULL) { + len = DUK_HSTRING_GET_BYTELEN(h); + ret = (const char *) DUK_HSTRING_GET_DATA(h); + } else { + len = def_len; + ret = def_ptr; + } + + if (out_len != NULL) { + *out_len = len; + } + return ret; +} + +DUK_EXTERNAL const char *duk_get_string_default(duk_hthread *thr, duk_idx_t idx, const char *def_value) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_get_hstring(thr, idx); + if (h != NULL) { + return (const char *) DUK_HSTRING_GET_DATA(h); + } else { + return def_value; + } +} + +DUK_INTERNAL const char *duk_get_string_notsymbol(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_get_hstring_notsymbol(thr, idx); + if (h) { + return (const char *) DUK_HSTRING_GET_DATA(h); + } else { + return NULL; + } +} + +DUK_EXTERNAL const char *duk_require_string(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return duk_require_lstring(thr, idx, NULL); +} + +DUK_INTERNAL const char *duk_require_string_notsymbol(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_require_hstring_notsymbol(thr, idx); + DUK_ASSERT(h != NULL); + return (const char *) DUK_HSTRING_GET_DATA(h); +} + +DUK_EXTERNAL void duk_require_object(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_OBJECT(tv))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "object", DUK_STR_NOT_OBJECT); + DUK_WO_NORETURN(return;); + } +} + +DUK_LOCAL void *duk__get_pointer_raw(duk_hthread *thr, duk_idx_t idx, void *def_value) { + duk_tval *tv; + void *p; + + DUK_ASSERT_CTX_VALID(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (!DUK_TVAL_IS_POINTER(tv)) { + return def_value; + } + + p = DUK_TVAL_GET_POINTER(tv); /* may be NULL */ + return p; +} + +DUK_EXTERNAL void *duk_get_pointer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_pointer_raw(thr, idx, NULL /*def_value*/); +} + +DUK_EXTERNAL void *duk_opt_pointer(duk_hthread *thr, duk_idx_t idx, void *def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_pointer(thr, idx); +} + +DUK_EXTERNAL void *duk_get_pointer_default(duk_hthread *thr, duk_idx_t idx, void *def_value) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_pointer_raw(thr, idx, def_value); +} + +DUK_EXTERNAL void *duk_require_pointer(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + void *p; + + DUK_ASSERT_API_ENTRY(thr); + + /* Note: here we must be wary of the fact that a pointer may be + * valid and be a NULL. + */ + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_POINTER(tv))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "pointer", DUK_STR_NOT_POINTER); + DUK_WO_NORETURN(return NULL;); + } + p = DUK_TVAL_GET_POINTER(tv); /* may be NULL */ + return p; +} + +#if 0 /*unused*/ +DUK_INTERNAL void *duk_get_voidptr(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_heaphdr *h; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (!DUK_TVAL_IS_HEAP_ALLOCATED(tv)) { + return NULL; + } + + h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + return (void *) h; +} +#endif + +DUK_LOCAL void *duk__get_buffer_helper(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size, duk_bool_t throw_flag) { + duk_hbuffer *h; + void *ret; + duk_size_t len; + duk_tval *tv; + + DUK_ASSERT_CTX_VALID(thr); + + if (out_size != NULL) { + *out_size = 0; + } + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_LIKELY(DUK_TVAL_IS_BUFFER(tv))) { + h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + + len = DUK_HBUFFER_GET_SIZE(h); + ret = DUK_HBUFFER_GET_DATA_PTR(thr->heap, h); + } else { + if (throw_flag) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "buffer", DUK_STR_NOT_BUFFER); + DUK_WO_NORETURN(return NULL;); + } + len = def_size; + ret = def_ptr; + } + + if (out_size != NULL) { + *out_size = len; + } + return ret; +} + +DUK_EXTERNAL void *duk_get_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size) { + DUK_ASSERT_API_ENTRY(thr); + + return duk__get_buffer_helper(thr, idx, out_size, NULL /*def_ptr*/, 0 /*def_size*/, 0 /*throw_flag*/); +} + +DUK_EXTERNAL void *duk_opt_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + if (out_size != NULL) { + *out_size = def_size; + } + return def_ptr; + } + return duk_require_buffer(thr, idx, out_size); +} + +DUK_EXTERNAL void *duk_get_buffer_default(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_len) { + DUK_ASSERT_API_ENTRY(thr); + + return duk__get_buffer_helper(thr, idx, out_size, def_ptr, def_len, 0 /*throw_flag*/); +} + +DUK_EXTERNAL void *duk_require_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size) { + DUK_ASSERT_API_ENTRY(thr); + + return duk__get_buffer_helper(thr, idx, out_size, NULL /*def_ptr*/, 0 /*def_size*/, 1 /*throw_flag*/); +} + +/* Get the active buffer data area for a plain buffer or a buffer object. + * Return NULL if the the value is not a buffer. Note that a buffer may + * have a NULL data pointer when its size is zero, the optional 'out_isbuffer' + * argument allows caller to detect this reliably. + */ +DUK_INTERNAL void *duk_get_buffer_data_raw(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size, duk_bool_t throw_flag, duk_bool_t *out_isbuffer) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + if (out_isbuffer != NULL) { + *out_isbuffer = 0; + } + if (out_size != NULL) { + *out_size = def_size; + } + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_BUFFER(tv)) { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + if (out_size != NULL) { + *out_size = DUK_HBUFFER_GET_SIZE(h); + } + if (out_isbuffer != NULL) { + *out_isbuffer = 1; + } + return (void *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h); /* may be NULL (but only if size is 0) */ + } +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + else if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (DUK_HOBJECT_IS_BUFOBJ(h)) { + /* XXX: this is probably a useful shared helper: for a + * duk_hbufobj, get a validated buffer pointer/length. + */ + duk_hbufobj *h_bufobj = (duk_hbufobj *) h; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + if (h_bufobj->buf != NULL && + DUK_HBUFOBJ_VALID_SLICE(h_bufobj)) { + duk_uint8_t *p; + + p = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufobj->buf); + if (out_size != NULL) { + *out_size = (duk_size_t) h_bufobj->length; + } + if (out_isbuffer != NULL) { + *out_isbuffer = 1; + } + return (void *) (p + h_bufobj->offset); + } + /* if slice not fully valid, treat as error */ + } + } +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + + if (throw_flag) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "buffer", DUK_STR_NOT_BUFFER); + DUK_WO_NORETURN(return NULL;); + } + return def_ptr; +} + +DUK_EXTERNAL void *duk_get_buffer_data(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size) { + DUK_ASSERT_API_ENTRY(thr); + return duk_get_buffer_data_raw(thr, idx, out_size, NULL /*def_ptr*/, 0 /*def_size*/, 0 /*throw_flag*/, NULL); +} + +DUK_EXTERNAL void *duk_get_buffer_data_default(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size) { + DUK_ASSERT_API_ENTRY(thr); + return duk_get_buffer_data_raw(thr, idx, out_size, def_ptr, def_size, 0 /*throw_flag*/, NULL); +} + +DUK_EXTERNAL void *duk_opt_buffer_data(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + if (out_size != NULL) { + *out_size = def_size; + } + return def_ptr; + } + return duk_require_buffer_data(thr, idx, out_size); +} + +DUK_EXTERNAL void *duk_require_buffer_data(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size) { + DUK_ASSERT_API_ENTRY(thr); + return duk_get_buffer_data_raw(thr, idx, out_size, NULL /*def_ptr*/, 0 /*def_size*/, 1 /*throw_flag*/, NULL); +} + +/* Raw helper for getting a value from the stack, checking its tag. + * The tag cannot be a number because numbers don't have an internal + * tag in the packed representation. + */ + +DUK_LOCAL duk_heaphdr *duk__get_tagged_heaphdr_raw(duk_hthread *thr, duk_idx_t idx, duk_uint_t tag) { + duk_tval *tv; + duk_heaphdr *ret; + + DUK_ASSERT_CTX_VALID(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_GET_TAG(tv) != tag) { + return (duk_heaphdr *) NULL; + } + + ret = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(ret != NULL); /* tagged null pointers should never occur */ + return ret; + +} + +DUK_INTERNAL duk_hstring *duk_get_hstring(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return (duk_hstring *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_STRING); +} + +DUK_INTERNAL duk_hstring *duk_get_hstring_notsymbol(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hstring *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_STRING); + if (DUK_UNLIKELY(h && DUK_HSTRING_HAS_SYMBOL(h))) { + return NULL; + } + return h; +} + +DUK_INTERNAL duk_hstring *duk_require_hstring(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hstring *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_STRING); + if (DUK_UNLIKELY(h == NULL)) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "string", DUK_STR_NOT_STRING); + DUK_WO_NORETURN(return NULL;); + } + return h; +} + +DUK_INTERNAL duk_hstring *duk_require_hstring_notsymbol(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hstring *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_STRING); + if (DUK_UNLIKELY(h == NULL || DUK_HSTRING_HAS_SYMBOL(h))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "string", DUK_STR_NOT_STRING); + DUK_WO_NORETURN(return NULL;); + } + return h; +} + +DUK_INTERNAL duk_hobject *duk_get_hobject(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); +} + +DUK_INTERNAL duk_hobject *duk_require_hobject(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(h == NULL)) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "object", DUK_STR_NOT_OBJECT); + DUK_WO_NORETURN(return NULL;); + } + return h; +} + +DUK_INTERNAL duk_hbuffer *duk_get_hbuffer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return (duk_hbuffer *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_BUFFER); +} + +DUK_INTERNAL duk_hbuffer *duk_require_hbuffer(duk_hthread *thr, duk_idx_t idx) { + duk_hbuffer *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hbuffer *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_BUFFER); + if (DUK_UNLIKELY(h == NULL)) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "buffer", DUK_STR_NOT_BUFFER); + DUK_WO_NORETURN(return NULL;); + } + return h; +} + +DUK_INTERNAL duk_hthread *duk_get_hthread(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(h != NULL && !DUK_HOBJECT_IS_THREAD(h))) { + h = NULL; + } + return (duk_hthread *) h; +} + +DUK_INTERNAL duk_hthread *duk_require_hthread(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(!(h != NULL && DUK_HOBJECT_IS_THREAD(h)))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "thread", DUK_STR_NOT_THREAD); + DUK_WO_NORETURN(return NULL;); + } + return (duk_hthread *) h; +} + +DUK_INTERNAL duk_hcompfunc *duk_get_hcompfunc(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(h != NULL && !DUK_HOBJECT_IS_COMPFUNC(h))) { + h = NULL; + } + return (duk_hcompfunc *) h; +} + +DUK_INTERNAL duk_hcompfunc *duk_require_hcompfunc(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(!(h != NULL && DUK_HOBJECT_IS_COMPFUNC(h)))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "compiledfunction", DUK_STR_NOT_COMPFUNC); + DUK_WO_NORETURN(return NULL;); + } + return (duk_hcompfunc *) h; +} + +DUK_INTERNAL duk_hnatfunc *duk_get_hnatfunc(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(h != NULL && !DUK_HOBJECT_IS_NATFUNC(h))) { + h = NULL; + } + return (duk_hnatfunc *) h; +} + +DUK_INTERNAL duk_hnatfunc *duk_require_hnatfunc(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(!(h != NULL && DUK_HOBJECT_IS_NATFUNC(h)))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "nativefunction", DUK_STR_NOT_NATFUNC); + DUK_WO_NORETURN(return NULL;); + } + return (duk_hnatfunc *) h; +} + +DUK_EXTERNAL duk_c_function duk_get_c_function(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_hobject *h; + duk_hnatfunc *f; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_OBJECT(tv))) { + return NULL; + } + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + if (DUK_UNLIKELY(!DUK_HOBJECT_IS_NATFUNC(h))) { + return NULL; + } + DUK_ASSERT(DUK_HOBJECT_HAS_NATFUNC(h)); + f = (duk_hnatfunc *) h; + + return f->func; +} + +DUK_EXTERNAL duk_c_function duk_opt_c_function(duk_hthread *thr, duk_idx_t idx, duk_c_function def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_c_function(thr, idx); +} + +DUK_EXTERNAL duk_c_function duk_get_c_function_default(duk_hthread *thr, duk_idx_t idx, duk_c_function def_value) { + duk_c_function ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = duk_get_c_function(thr, idx); + if (ret != NULL) { + return ret; + } + + return def_value; +} + +DUK_EXTERNAL duk_c_function duk_require_c_function(duk_hthread *thr, duk_idx_t idx) { + duk_c_function ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = duk_get_c_function(thr, idx); + if (DUK_UNLIKELY(!ret)) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "nativefunction", DUK_STR_NOT_NATFUNC); + DUK_WO_NORETURN(return ret;); + } + return ret; +} + +DUK_EXTERNAL void duk_require_function(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + if (DUK_UNLIKELY(!duk_is_function(thr, idx))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "function", DUK_STR_NOT_FUNCTION); + DUK_WO_NORETURN(return;); + } +} + +DUK_INTERNAL void duk_require_constructable(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_require_hobject_accept_mask(thr, idx, DUK_TYPE_MASK_LIGHTFUNC); + if (DUK_UNLIKELY(h != NULL && !DUK_HOBJECT_HAS_CONSTRUCTABLE(h))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "constructable", DUK_STR_NOT_CONSTRUCTABLE); + DUK_WO_NORETURN(return;); + } + /* Lightfuncs (h == NULL) are constructable. */ +} + +DUK_EXTERNAL duk_hthread *duk_get_context(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return duk_get_hthread(thr, idx); +} + +DUK_EXTERNAL duk_hthread *duk_require_context(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return duk_require_hthread(thr, idx); +} + +DUK_EXTERNAL duk_hthread *duk_opt_context(duk_hthread *thr, duk_idx_t idx, duk_hthread *def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_context(thr, idx); +} + +DUK_EXTERNAL duk_hthread *duk_get_context_default(duk_hthread *thr, duk_idx_t idx, duk_hthread *def_value) { + duk_hthread *ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = duk_get_context(thr, idx); + if (ret != NULL) { + return ret; + } + + return def_value; +} + +DUK_EXTERNAL void *duk_get_heapptr(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + void *ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_HEAP_ALLOCATED(tv))) { + return (void *) NULL; + } + + ret = (void *) DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(ret != NULL); + return ret; +} + +DUK_EXTERNAL void *duk_opt_heapptr(duk_hthread *thr, duk_idx_t idx, void *def_value) { + DUK_ASSERT_API_ENTRY(thr); + + if (duk_check_type_mask(thr, idx, DUK_TYPE_MASK_NONE | DUK_TYPE_MASK_UNDEFINED)) { + return def_value; + } + return duk_require_heapptr(thr, idx); +} + +DUK_EXTERNAL void *duk_get_heapptr_default(duk_hthread *thr, duk_idx_t idx, void *def_value) { + void *ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = duk_get_heapptr(thr, idx); + if (ret != NULL) { + return ret; + } + + return def_value; +} + +DUK_EXTERNAL void *duk_require_heapptr(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + void *ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_UNLIKELY(!DUK_TVAL_IS_HEAP_ALLOCATED(tv))) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "heapobject", DUK_STR_UNEXPECTED_TYPE); + DUK_WO_NORETURN(return NULL;); + } + + ret = (void *) DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(ret != NULL); + return ret; +} + +/* Internal helper for getting/requiring a duk_hobject with possible promotion. */ +DUK_LOCAL duk_hobject *duk__get_hobject_promote_mask_raw(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask) { + duk_uint_t val_mask; + duk_hobject *res; + + DUK_ASSERT_CTX_VALID(thr); + + res = duk_get_hobject(thr, idx); /* common case, not promoted */ + if (DUK_LIKELY(res != NULL)) { + DUK_ASSERT(res != NULL); + return res; + } + + val_mask = duk_get_type_mask(thr, idx); + if (val_mask & type_mask) { + if (type_mask & DUK_TYPE_MASK_PROMOTE) { + res = duk_to_hobject(thr, idx); + DUK_ASSERT(res != NULL); + return res; + } else { + return NULL; /* accept without promoting */ + } + } + + if (type_mask & DUK_TYPE_MASK_THROW) { + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, "object", DUK_STR_NOT_OBJECT); + DUK_WO_NORETURN(return NULL;); + } + return NULL; +} + +/* Get a duk_hobject * at 'idx'; if the value is not an object but matches the + * supplied 'type_mask', promote it to an object and return the duk_hobject *. + * This is useful for call sites which want an object but also accept a plain + * buffer and/or a lightfunc which gets automatically promoted to an object. + * Return value is NULL if value is neither an object nor a plain type allowed + * by the mask. + */ +DUK_INTERNAL duk_hobject *duk_get_hobject_promote_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_hobject_promote_mask_raw(thr, idx, type_mask | DUK_TYPE_MASK_PROMOTE); +} + +/* Like duk_get_hobject_promote_mask() but throw a TypeError instead of + * returning a NULL. + */ +DUK_INTERNAL duk_hobject *duk_require_hobject_promote_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_hobject_promote_mask_raw(thr, idx, type_mask | DUK_TYPE_MASK_THROW | DUK_TYPE_MASK_PROMOTE); +} + +/* Require a duk_hobject * at 'idx'; if the value is not an object but matches the + * supplied 'type_mask', return a NULL instead. Otherwise throw a TypeError. + */ +DUK_INTERNAL duk_hobject *duk_require_hobject_accept_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t type_mask) { + DUK_ASSERT_API_ENTRY(thr); + return duk__get_hobject_promote_mask_raw(thr, idx, type_mask | DUK_TYPE_MASK_THROW); +} + +DUK_INTERNAL duk_hobject *duk_get_hobject_with_class(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t classnum) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_DISABLE(classnum >= 0); /* unsigned */ + DUK_ASSERT(classnum <= DUK_HOBJECT_CLASS_MAX); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(h != NULL && DUK_HOBJECT_GET_CLASS_NUMBER(h) != classnum)) { + h = NULL; + } + return h; +} + +DUK_INTERNAL duk_hobject *duk_require_hobject_with_class(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t classnum) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_DISABLE(classnum >= 0); /* unsigned */ + DUK_ASSERT(classnum <= DUK_HOBJECT_CLASS_MAX); + + h = (duk_hobject *) duk__get_tagged_heaphdr_raw(thr, idx, DUK_TAG_OBJECT); + if (DUK_UNLIKELY(!(h != NULL && DUK_HOBJECT_GET_CLASS_NUMBER(h) == classnum))) { + duk_hstring *h_class; + h_class = DUK_HTHREAD_GET_STRING(thr, DUK_HOBJECT_CLASS_NUMBER_TO_STRIDX(classnum)); + DUK_UNREF(h_class); + + DUK_ERROR_REQUIRE_TYPE_INDEX(thr, idx, (const char *) DUK_HSTRING_GET_DATA(h_class), DUK_STR_UNEXPECTED_TYPE); + DUK_WO_NORETURN(return NULL;); + } + return h; +} + +DUK_EXTERNAL duk_size_t duk_get_length(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: + case DUK_TAG_BOOLEAN: + case DUK_TAG_POINTER: + return 0; +#if defined(DUK_USE_PREFER_SIZE) + /* String and buffer have a virtual non-configurable .length property + * which is within size_t range so it can be looked up without specific + * type checks. Lightfuncs inherit from %NativeFunctionPrototype% + * which provides an inherited .length accessor; it could be overwritten + * to produce unexpected types or values, but just number convert and + * duk_size_t cast for now. + */ + case DUK_TAG_STRING: + case DUK_TAG_BUFFER: + case DUK_TAG_LIGHTFUNC: { + duk_size_t ret; + duk_get_prop_stridx(thr, idx, DUK_STRIDX_LENGTH); + ret = (duk_size_t) duk_to_number_m1(thr); + duk_pop_unsafe(thr); + return ret; + } +#else /* DUK_USE_PREFER_SIZE */ + case DUK_TAG_STRING: { + duk_hstring *h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + return 0; + } + return (duk_size_t) DUK_HSTRING_GET_CHARLEN(h); + } + case DUK_TAG_BUFFER: { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + return (duk_size_t) DUK_HBUFFER_GET_SIZE(h); + } + case DUK_TAG_LIGHTFUNC: { + /* We could look up the length from the lightfunc duk_tval, + * but since Duktape 2.2 lightfunc .length comes from + * %NativeFunctionPrototype% which can be overridden, so + * look up the property explicitly. + */ + duk_size_t ret; + duk_get_prop_stridx(thr, idx, DUK_STRIDX_LENGTH); + ret = (duk_size_t) duk_to_number_m1(thr); + duk_pop_unsafe(thr); + return ret; + } +#endif /* DUK_USE_PREFER_SIZE */ + case DUK_TAG_OBJECT: { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + return (duk_size_t) duk_hobject_get_length(thr, h); + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: + /* number or 'unused' */ + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv) || DUK_TVAL_IS_UNUSED(tv)); + return 0; + } + + DUK_UNREACHABLE(); +} + +/* + * duk_known_xxx() helpers + * + * Used internally when we're 100% sure that a certain index is valid and + * contains an object of a certain type. For example, if we duk_push_object() + * we can then safely duk_known_hobject(thr, -1). These helpers just assert + * for the index and type, and if the assumptions are not valid, memory unsafe + * behavior happens. + */ + +DUK_LOCAL duk_heaphdr *duk__known_heaphdr(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_heaphdr *h; + + DUK_ASSERT_CTX_VALID(thr); + if (idx < 0) { + tv = thr->valstack_top + idx; + } else { + tv = thr->valstack_bottom + idx; + } + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_ASSERT(tv < thr->valstack_top); + h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + return h; +} + +DUK_INTERNAL duk_hstring *duk_known_hstring(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(duk_get_hstring(thr, idx) != NULL); + return (duk_hstring *) duk__known_heaphdr(thr, idx); +} + +DUK_INTERNAL duk_hobject *duk_known_hobject(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(duk_get_hobject(thr, idx) != NULL); + return (duk_hobject *) duk__known_heaphdr(thr, idx); +} + +DUK_INTERNAL duk_hbuffer *duk_known_hbuffer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(duk_get_hbuffer(thr, idx) != NULL); + return (duk_hbuffer *) duk__known_heaphdr(thr, idx); +} + +DUK_INTERNAL duk_hcompfunc *duk_known_hcompfunc(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(duk_get_hcompfunc(thr, idx) != NULL); + return (duk_hcompfunc *) duk__known_heaphdr(thr, idx); +} + +DUK_INTERNAL duk_hnatfunc *duk_known_hnatfunc(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(duk_get_hnatfunc(thr, idx) != NULL); + return (duk_hnatfunc *) duk__known_heaphdr(thr, idx); +} + +DUK_EXTERNAL void duk_set_length(duk_hthread *thr, duk_idx_t idx, duk_size_t len) { + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_normalize_index(thr, idx); + duk_push_uint(thr, (duk_uint_t) len); + duk_put_prop_stridx(thr, idx, DUK_STRIDX_LENGTH); +} + +/* + * Conversions and coercions + * + * The conversion/coercions are in-place operations on the value stack. + * Some operations are implemented here directly, while others call a + * helper in duk_js_ops.c after validating arguments. + */ + +/* E5 Section 8.12.8 */ + +DUK_LOCAL duk_bool_t duk__defaultvalue_coerce_attempt(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t func_stridx) { + if (duk_get_prop_stridx(thr, idx, func_stridx)) { + /* [ ... func ] */ + if (duk_is_callable(thr, -1)) { + duk_dup(thr, idx); /* -> [ ... func this ] */ + duk_call_method(thr, 0); /* -> [ ... retval ] */ + if (duk_is_primitive(thr, -1)) { + duk_replace(thr, idx); + return 1; + } + /* [ ... retval ]; popped below */ + } + } + duk_pop_unsafe(thr); /* [ ... func/retval ] -> [ ... ] */ + return 0; +} + +DUK_EXTERNAL void duk_to_undefined(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv); /* side effects */ +} + +DUK_EXTERNAL void duk_to_null(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + DUK_TVAL_SET_NULL_UPDREF(thr, tv); /* side effects */ +} + +/* E5 Section 9.1 */ +DUK_LOCAL const char * const duk__toprim_hint_strings[3] = { + "default", "string", "number" +}; +DUK_LOCAL void duk__to_primitive_helper(duk_hthread *thr, duk_idx_t idx, duk_int_t hint, duk_bool_t check_symbol) { + /* Inline initializer for coercers[] is not allowed by old compilers like BCC. */ + duk_small_uint_t coercers[2]; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(hint == DUK_HINT_NONE || hint == DUK_HINT_NUMBER || hint == DUK_HINT_STRING); + + idx = duk_require_normalize_index(thr, idx); + + /* If already primitive, return as is. */ + if (!duk_check_type_mask(thr, idx, DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_LIGHTFUNC | + DUK_TYPE_MASK_BUFFER)) { + DUK_ASSERT(!duk_is_buffer(thr, idx)); /* duk_to_string() relies on this behavior */ + return; + } + + /* @@toPrimitive lookup. Also do for plain buffers and lightfuncs + * which mimic objects. + */ + if (check_symbol && duk_get_method_stridx(thr, idx, DUK_STRIDX_WELLKNOWN_SYMBOL_TO_PRIMITIVE)) { + DUK_ASSERT(hint >= 0 && (duk_size_t) hint < sizeof(duk__toprim_hint_strings) / sizeof(const char *)); + duk_dup(thr, idx); + duk_push_string(thr, duk__toprim_hint_strings[hint]); + duk_call_method(thr, 1); /* [ ... method value hint ] -> [ ... res] */ + if (duk_check_type_mask(thr, -1, DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_LIGHTFUNC | + DUK_TYPE_MASK_BUFFER)) { + goto fail; + } + duk_replace(thr, idx); + return; + } + + /* Objects are coerced based on E5 specification. + * Lightfuncs are coerced because they behave like + * objects even if they're internally a primitive + * type. Same applies to plain buffers, which behave + * like ArrayBuffer objects since Duktape 2.x. + */ + + /* Hint magic for Date is unnecessary in ES2015 because of + * Date.prototype[@@toPrimitive]. However, it is needed if + * symbol support is not enabled. + */ +#if defined(DUK_USE_SYMBOL_BUILTIN) + if (hint == DUK_HINT_NONE) { + hint = DUK_HINT_NUMBER; + } +#else /* DUK_USE_SYMBOL_BUILTIN */ + if (hint == DUK_HINT_NONE) { + duk_small_uint_t class_number; + + class_number = duk_get_class_number(thr, idx); + if (class_number == DUK_HOBJECT_CLASS_DATE) { + hint = DUK_HINT_STRING; + } else { + hint = DUK_HINT_NUMBER; + } + } +#endif /* DUK_USE_SYMBOL_BUILTIN */ + + coercers[0] = DUK_STRIDX_VALUE_OF; + coercers[1] = DUK_STRIDX_TO_STRING; + if (hint == DUK_HINT_STRING) { + coercers[0] = DUK_STRIDX_TO_STRING; + coercers[1] = DUK_STRIDX_VALUE_OF; + } + + if (duk__defaultvalue_coerce_attempt(thr, idx, coercers[0])) { + DUK_ASSERT(!duk_is_buffer(thr, idx)); /* duk_to_string() relies on this behavior */ + return; + } + + if (duk__defaultvalue_coerce_attempt(thr, idx, coercers[1])) { + DUK_ASSERT(!duk_is_buffer(thr, idx)); /* duk_to_string() relies on this behavior */ + return; + } + + fail: + DUK_ERROR_TYPE(thr, DUK_STR_TOPRIMITIVE_FAILED); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_to_primitive(duk_hthread *thr, duk_idx_t idx, duk_int_t hint) { + duk__to_primitive_helper(thr, idx, hint, 1 /*check_symbol*/); +} + +#if defined(DUK_USE_SYMBOL_BUILTIN) +DUK_INTERNAL void duk_to_primitive_ordinary(duk_hthread *thr, duk_idx_t idx, duk_int_t hint) { + duk__to_primitive_helper(thr, idx, hint, 0 /*check_symbol*/); +} +#endif + +/* E5 Section 9.2 */ +DUK_EXTERNAL duk_bool_t duk_to_boolean(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_bool_t val; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + tv = DUK_GET_TVAL_POSIDX(thr, idx); + DUK_ASSERT(tv != NULL); + + val = duk_js_toboolean(tv); + DUK_ASSERT(val == 0 || val == 1); + + /* Note: no need to re-lookup tv, conversion is side effect free. */ + DUK_ASSERT(tv != NULL); + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv, val); /* side effects */ + return val; +} + +DUK_INTERNAL duk_bool_t duk_to_boolean_top_pop(duk_hthread *thr) { + duk_tval *tv; + duk_bool_t val; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, -1); + DUK_ASSERT(tv != NULL); + + val = duk_js_toboolean(tv); + DUK_ASSERT(val == 0 || val == 1); + + duk_pop_unsafe(thr); + return val; +} + +DUK_EXTERNAL duk_double_t duk_to_number(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_double_t d; + + DUK_ASSERT_API_ENTRY(thr); + + /* XXX: No need to normalize; the whole operation could be inlined here to + * avoid 'tv' re-lookup. + */ + idx = duk_require_normalize_index(thr, idx); + tv = DUK_GET_TVAL_POSIDX(thr, idx); + DUK_ASSERT(tv != NULL); + d = duk_js_tonumber(thr, tv); /* XXX: fastint coercion? now result will always be a non-fastint */ + + /* ToNumber() may have side effects so must relookup 'tv'. */ + tv = DUK_GET_TVAL_POSIDX(thr, idx); + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv, d); /* side effects */ + return d; +} + +DUK_INTERNAL duk_double_t duk_to_number_m1(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + return duk_to_number(thr, -1); +} +DUK_INTERNAL duk_double_t duk_to_number_m2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + return duk_to_number(thr, -2); +} + +DUK_INTERNAL duk_double_t duk_to_number_tval(duk_hthread *thr, duk_tval *tv) { +#if defined(DUK_USE_PREFER_SIZE) + duk_double_t res; + + DUK_ASSERT_API_ENTRY(thr); + + duk_push_tval(thr, tv); + res = duk_to_number_m1(thr); + duk_pop_unsafe(thr); + return res; +#else + duk_double_t res; + duk_tval *tv_dst; + + DUK_ASSERT_API_ENTRY(thr); + DUK__ASSERT_SPACE(); + + tv_dst = thr->valstack_top++; + DUK_TVAL_SET_TVAL(tv_dst, tv); + DUK_TVAL_INCREF(thr, tv_dst); /* decref not necessary */ + res = duk_to_number_m1(thr); /* invalidates tv_dst */ + + tv_dst = --thr->valstack_top; + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_dst)); + DUK_ASSERT(!DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv_dst)); /* plain number */ + DUK_TVAL_SET_UNDEFINED(tv_dst); /* valstack init policy */ + + return res; +#endif +} + +/* XXX: combine all the integer conversions: they share everything + * but the helper function for coercion. + */ + +typedef duk_double_t (*duk__toint_coercer)(duk_hthread *thr, duk_tval *tv); + +DUK_LOCAL duk_double_t duk__to_int_uint_helper(duk_hthread *thr, duk_idx_t idx, duk__toint_coercer coerce_func) { + duk_tval *tv; + duk_double_t d; + + DUK_ASSERT_CTX_VALID(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + +#if defined(DUK_USE_FASTINT) + /* If argument is a fastint, guarantee that it remains one. + * There's no downgrade check for other cases. + */ + if (DUK_TVAL_IS_FASTINT(tv)) { + /* XXX: Unnecessary conversion back and forth. */ + return (duk_double_t) DUK_TVAL_GET_FASTINT(tv); + } +#endif + d = coerce_func(thr, tv); + + /* XXX: fastint? */ + + /* Relookup in case coerce_func() has side effects, e.g. ends up coercing an object */ + tv = duk_require_tval(thr, idx); + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv, d); /* side effects */ + return d; +} + +DUK_EXTERNAL duk_int_t duk_to_int(duk_hthread *thr, duk_idx_t idx) { + /* Value coercion (in stack): ToInteger(), E5 Section 9.4, + * API return value coercion: custom. + */ + DUK_ASSERT_API_ENTRY(thr); + (void) duk__to_int_uint_helper(thr, idx, duk_js_tointeger); + return (duk_int_t) duk__api_coerce_d2i(thr, idx, 0 /*def_value*/, 0 /*require*/); +} + +DUK_EXTERNAL duk_uint_t duk_to_uint(duk_hthread *thr, duk_idx_t idx) { + /* Value coercion (in stack): ToInteger(), E5 Section 9.4, + * API return value coercion: custom. + */ + DUK_ASSERT_API_ENTRY(thr); + (void) duk__to_int_uint_helper(thr, idx, duk_js_tointeger); + return (duk_uint_t) duk__api_coerce_d2ui(thr, idx, 0 /*def_value*/, 0 /*require*/); +} + +DUK_EXTERNAL duk_int32_t duk_to_int32(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_int32_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + ret = duk_js_toint32(thr, tv); + + /* Relookup in case coerce_func() has side effects, e.g. ends up coercing an object */ + tv = duk_require_tval(thr, idx); + DUK_TVAL_SET_I32_UPDREF(thr, tv, ret); /* side effects */ + return ret; +} + +DUK_EXTERNAL duk_uint32_t duk_to_uint32(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_uint32_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + ret = duk_js_touint32(thr, tv); + + /* Relookup in case coerce_func() has side effects, e.g. ends up coercing an object */ + tv = duk_require_tval(thr, idx); + DUK_TVAL_SET_U32_UPDREF(thr, tv, ret); /* side effects */ + return ret; +} + +DUK_EXTERNAL duk_uint16_t duk_to_uint16(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_uint16_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + ret = duk_js_touint16(thr, tv); + + /* Relookup in case coerce_func() has side effects, e.g. ends up coercing an object */ + tv = duk_require_tval(thr, idx); + DUK_TVAL_SET_U32_UPDREF(thr, tv, ret); /* side effects */ + return ret; +} + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +/* Special coercion for Uint8ClampedArray. */ +DUK_INTERNAL duk_uint8_t duk_to_uint8clamped(duk_hthread *thr, duk_idx_t idx) { + duk_double_t d; + duk_double_t t; + duk_uint8_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + /* XXX: Simplify this algorithm, should be possible to come up with + * a shorter and faster algorithm by inspecting IEEE representation + * directly. + */ + + d = duk_to_number(thr, idx); + if (d <= 0.0) { + return 0; + } else if (d >= 255) { + return 255; + } else if (DUK_ISNAN(d)) { + /* Avoid NaN-to-integer coercion as it is compiler specific. */ + return 0; + } + + t = d - DUK_FLOOR(d); + if (t == 0.5) { + /* Exact halfway, round to even. */ + ret = (duk_uint8_t) d; + ret = (ret + 1) & 0xfe; /* Example: d=3.5, t=0.5 -> ret = (3 + 1) & 0xfe = 4 & 0xfe = 4 + * Example: d=4.5, t=0.5 -> ret = (4 + 1) & 0xfe = 5 & 0xfe = 4 + */ + } else { + /* Not halfway, round to nearest. */ + ret = (duk_uint8_t) (d + 0.5); + } + return ret; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +DUK_EXTERNAL const char *duk_to_lstring(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len) { + DUK_ASSERT_API_ENTRY(thr); + + (void) duk_to_string(thr, idx); + DUK_ASSERT(duk_is_string(thr, idx)); + return duk_require_lstring(thr, idx, out_len); +} + +DUK_LOCAL duk_ret_t duk__safe_to_string_raw(duk_hthread *thr, void *udata) { + DUK_ASSERT_CTX_VALID(thr); + DUK_UNREF(udata); + + duk_to_string(thr, -1); + return 1; +} + +DUK_EXTERNAL const char *duk_safe_to_lstring(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_len) { + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + + /* We intentionally ignore the duk_safe_call() return value and only + * check the output type. This way we don't also need to check that + * the returned value is indeed a string in the success case. + */ + + duk_dup(thr, idx); + (void) duk_safe_call(thr, duk__safe_to_string_raw, NULL /*udata*/, 1 /*nargs*/, 1 /*nrets*/); + if (!duk_is_string(thr, -1)) { + /* Error: try coercing error to string once. */ + (void) duk_safe_call(thr, duk__safe_to_string_raw, NULL /*udata*/, 1 /*nargs*/, 1 /*nrets*/); + if (!duk_is_string(thr, -1)) { + /* Double error */ + duk_pop_unsafe(thr); + duk_push_hstring_stridx(thr, DUK_STRIDX_UC_ERROR); + } else { + ; + } + } else { + /* String; may be a symbol, accepted. */ + ; + } + DUK_ASSERT(duk_is_string(thr, -1)); + + duk_replace(thr, idx); + DUK_ASSERT(duk_get_string(thr, idx) != NULL); + return duk_get_lstring(thr, idx, out_len); +} + +DUK_INTERNAL duk_hstring *duk_to_property_key_hstring(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + + duk_to_primitive(thr, idx, DUK_HINT_STRING); /* needed for e.g. Symbol objects */ + h = duk_get_hstring(thr, idx); + if (h == NULL) { + /* The "is string?" check may seem unnecessary, but as things + * are duk_to_hstring() invokes ToString() which fails for + * symbols. But since symbols are already strings for Duktape + * C API, we check for that before doing the coercion. + */ + h = duk_to_hstring(thr, idx); + } + DUK_ASSERT(h != NULL); + return h; +} + +#if defined(DUK_USE_DEBUGGER_SUPPORT) /* only needed by debugger for now */ +DUK_INTERNAL duk_hstring *duk_safe_to_hstring(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + (void) duk_safe_to_string(thr, idx); + DUK_ASSERT(duk_is_string(thr, idx)); + DUK_ASSERT(duk_get_hstring(thr, idx) != NULL); + return duk_known_hstring(thr, idx); +} +#endif + +/* Push Object.prototype.toString() output for 'tv'. */ +#if 0 /* See XXX note why this variant doesn't work. */ +DUK_INTERNAL void duk_push_class_string_tval(duk_hthread *thr, duk_tval *tv, duk_bool_t avoid_side_effects) { + duk_uint_t stridx_bidx = 0; /* (prototype_bidx << 16) + default_tag_stridx */ + + DUK_ASSERT_API_ENTRY(thr); + + /* Conceptually for any non-undefined/null value we should do a + * ToObject() coercion and look up @@toStringTag (from the object + * prototype) to see if a custom tag should be used. Avoid the + * actual conversion by doing a prototype lookup without the object + * coercion. However, see problem below. + */ + + duk_push_literal(thr, "[object "); /* -> [ ... "[object" ] */ + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNUSED: /* Treat like 'undefined', shouldn't happen. */ + case DUK_TAG_UNDEFINED: { + stridx_bidx = DUK_STRIDX_UC_UNDEFINED; + goto use_stridx; + } + case DUK_TAG_NULL: { + stridx_bidx = DUK_STRIDX_UC_NULL; + goto use_stridx; + } + case DUK_TAG_BOOLEAN: { + stridx_bidx = (DUK_BIDX_BOOLEAN_PROTOTYPE << 16) + DUK_STRIDX_UC_BOOLEAN; + goto use_proto_bidx; + } + case DUK_TAG_POINTER: { + stridx_bidx = (DUK_BIDX_POINTER_PROTOTYPE << 16) + DUK_STRIDX_UC_POINTER; + goto use_proto_bidx; + } + case DUK_TAG_LIGHTFUNC: { + stridx_bidx = (DUK_BIDX_FUNCTION_PROTOTYPE << 16) + DUK_STRIDX_UC_FUNCTION; + goto use_proto_bidx; + } + case DUK_TAG_STRING: { + duk_hstring *h; + h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + /* Even without DUK_USE_SYMBOL_BUILTIN the Symbol + * prototype exists so we can lookup @@toStringTag + * and provide [object Symbol] for symbol values + * created from C code. + */ + stridx_bidx = (DUK_BIDX_SYMBOL_PROTOTYPE << 16) + DUK_STRIDX_UC_SYMBOL; + } else { + stridx_bidx = (DUK_BIDX_STRING_PROTOTYPE << 16) + DUK_STRIDX_UC_STRING; + } + goto use_proto_bidx; + } + case DUK_TAG_OBJECT: { + duk_push_tval(thr, tv); + stridx_bidx = 0xffffffffUL; /* Marker value. */ + goto use_pushed_object; + } + case DUK_TAG_BUFFER: { + stridx_bidx = (DUK_BIDX_UINT8ARRAY_PROTOTYPE << 16) + DUK_STRIDX_UINT8_ARRAY; + goto use_proto_bidx; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: + /* Fall through to generic number case. */ +#endif + default: { + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); /* number (maybe fastint) */ + stridx_bidx = (DUK_BIDX_NUMBER_PROTOTYPE << 16) + DUK_STRIDX_UC_NUMBER; + goto use_proto_bidx; + } + } + DUK_ASSERT(0); /* Never here. */ + + use_proto_bidx: + DUK_ASSERT_BIDX_VALID((stridx_bidx >> 16) & 0xffffUL); + duk_push_hobject(thr, thr->builtins[(stridx_bidx >> 16) & 0xffffUL]); + /* Fall through. */ + + use_pushed_object: + /* [ ... "[object" obj ] */ + +#if defined(DUK_USE_SYMBOL_BUILTIN) + /* XXX: better handling with avoid_side_effects == 1; lookup tval + * without Proxy or getter side effects, and use it in sanitized + * form if it's a string. + */ + if (!avoid_side_effects) { + /* XXX: The problem with using the prototype object as the + * lookup base is that if @@toStringTag is a getter, its + * 'this' binding must be the ToObject() coerced input value, + * not the prototype object of the type. + */ + (void) duk_get_prop_stridx(thr, -1, DUK_STRIDX_WELLKNOWN_SYMBOL_TO_STRING_TAG); + if (duk_is_string_notsymbol(thr, -1)) { + duk_remove_m2(thr); + goto finish; + } + duk_pop_unsafe(thr); + } +#endif + + if (stridx_bidx == 0xffffffffUL) { + duk_hobject *h_obj; + duk_small_uint_t classnum; + + h_obj = duk_known_hobject(thr, -1); + DUK_ASSERT(h_obj != NULL); + classnum = DUK_HOBJECT_GET_CLASS_NUMBER(h_obj); + stridx_bidx = DUK_HOBJECT_CLASS_NUMBER_TO_STRIDX(classnum); + } else { + /* stridx_bidx already has the desired fallback stridx. */ + ; + } + duk_pop_unsafe(thr); + /* Fall through. */ + + use_stridx: + /* [ ... "[object" ] */ + duk_push_hstring_stridx(thr, stridx_bidx & 0xffffUL); + + finish: + /* [ ... "[object" tag ] */ + duk_push_literal(thr, "]"); + duk_concat(thr, 3); /* [ ... "[object" tag "]" ] -> [ ... res ] */ +} +#endif /* 0 */ + +DUK_INTERNAL void duk_push_class_string_tval(duk_hthread *thr, duk_tval *tv, duk_bool_t avoid_side_effects) { + duk_hobject *h_obj; + duk_small_uint_t classnum; + duk_small_uint_t stridx; + duk_tval tv_tmp; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(tv != NULL); + + /* Stabilize 'tv', duk_push_literal() may trigger side effects. */ + DUK_TVAL_SET_TVAL(&tv_tmp, tv); + tv = &tv_tmp; + + /* Conceptually for any non-undefined/null value we should do a + * ToObject() coercion and look up @@toStringTag (from the object + * prototype) to see if a custom result should be used. We'd like to + * avoid the actual conversion, but even for primitive types the + * prototype may have @@toStringTag. What's worse, the @@toStringTag + * property may be a getter that must get the object coerced value + * (not the prototype) as its 'this' binding. + * + * For now, do an actual object coercion. This could be avoided by + * doing a side effect free lookup to see if a getter would be invoked. + * If not, the value can be read directly and the object coercion could + * be avoided. This may not be worth it in practice, because + * Object.prototype.toString() is usually not performance critical. + */ + + duk_push_literal(thr, "[object "); /* -> [ ... "[object" ] */ + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNUSED: /* Treat like 'undefined', shouldn't happen. */ + case DUK_TAG_UNDEFINED: { + duk_push_hstring_stridx(thr, DUK_STRIDX_UC_UNDEFINED); + goto finish; + } + case DUK_TAG_NULL: { + duk_push_hstring_stridx(thr, DUK_STRIDX_UC_NULL); + goto finish; + } + } + + duk_push_tval(thr, tv); + tv = NULL; /* Invalidated by ToObject(). */ + duk_to_object(thr, -1); + + /* [ ... "[object" obj ] */ + +#if defined(DUK_USE_SYMBOL_BUILTIN) + /* XXX: better handling with avoid_side_effects == 1; lookup tval + * without Proxy or getter side effects, and use it in sanitized + * form if it's a string. + */ + if (!avoid_side_effects) { + (void) duk_get_prop_stridx(thr, -1, DUK_STRIDX_WELLKNOWN_SYMBOL_TO_STRING_TAG); + if (duk_is_string_notsymbol(thr, -1)) { + duk_remove_m2(thr); + goto finish; + } + duk_pop_unsafe(thr); + } +#else + DUK_UNREF(avoid_side_effects); +#endif + + h_obj = duk_known_hobject(thr, -1); + DUK_ASSERT(h_obj != NULL); + classnum = DUK_HOBJECT_GET_CLASS_NUMBER(h_obj); + stridx = DUK_HOBJECT_CLASS_NUMBER_TO_STRIDX(classnum); + duk_pop_unsafe(thr); + duk_push_hstring_stridx(thr, stridx); + + finish: + /* [ ... "[object" tag ] */ + duk_push_literal(thr, "]"); + duk_concat(thr, 3); /* [ ... "[object" tag "]" ] -> [ ... res ] */ +} + +/* XXX: other variants like uint, u32 etc */ +DUK_INTERNAL duk_int_t duk_to_int_clamped_raw(duk_hthread *thr, duk_idx_t idx, duk_int_t minval, duk_int_t maxval, duk_bool_t *out_clamped) { + duk_tval *tv; + duk_tval tv_tmp; + duk_double_t d, dmin, dmax; + duk_int_t res; + duk_bool_t clamped = 0; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + d = duk_js_tointeger(thr, tv); /* E5 Section 9.4, ToInteger() */ + + dmin = (duk_double_t) minval; + dmax = (duk_double_t) maxval; + + if (d < dmin) { + clamped = 1; + res = minval; + d = dmin; + } else if (d > dmax) { + clamped = 1; + res = maxval; + d = dmax; + } else { + res = (duk_int_t) d; + } + DUK_UNREF(d); /* SCANBUILD: with suitable dmin/dmax limits 'd' is unused */ + /* 'd' and 'res' agree here */ + + /* Relookup in case duk_js_tointeger() ends up e.g. coercing an object. */ + tv = duk_get_tval(thr, idx); + DUK_ASSERT(tv != NULL); /* not popped by side effect */ + DUK_TVAL_SET_TVAL(&tv_tmp, tv); +#if defined(DUK_USE_FASTINT) +#if (DUK_INT_MAX <= 0x7fffffffL) + DUK_TVAL_SET_I32(tv, res); +#else + /* Clamping needed if duk_int_t is 64 bits. */ + if (res >= DUK_FASTINT_MIN && res <= DUK_FASTINT_MAX) { + DUK_TVAL_SET_FASTINT(tv, res); + } else { + DUK_TVAL_SET_NUMBER(tv, d); + } +#endif +#else + DUK_TVAL_SET_NUMBER(tv, d); /* no need to incref */ +#endif + DUK_TVAL_DECREF(thr, &tv_tmp); /* side effects */ + + if (out_clamped) { + *out_clamped = clamped; + } else { + /* coerced value is updated to value stack even when RangeError thrown */ + if (clamped) { + DUK_ERROR_RANGE(thr, DUK_STR_NUMBER_OUTSIDE_RANGE); + DUK_WO_NORETURN(return 0;); + } + } + + return res; +} + +DUK_INTERNAL duk_int_t duk_to_int_clamped(duk_hthread *thr, duk_idx_t idx, duk_idx_t minval, duk_idx_t maxval) { + duk_bool_t dummy; + + DUK_ASSERT_API_ENTRY(thr); + + return duk_to_int_clamped_raw(thr, idx, minval, maxval, &dummy); +} + +DUK_INTERNAL duk_int_t duk_to_int_check_range(duk_hthread *thr, duk_idx_t idx, duk_int_t minval, duk_int_t maxval) { + DUK_ASSERT_API_ENTRY(thr); + return duk_to_int_clamped_raw(thr, idx, minval, maxval, NULL); /* out_clamped==NULL -> RangeError if outside range */ +} + +DUK_EXTERNAL const char *duk_to_string(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + tv = DUK_GET_TVAL_POSIDX(thr, idx); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: { + duk_push_hstring_stridx(thr, DUK_STRIDX_LC_UNDEFINED); + break; + } + case DUK_TAG_NULL: { + duk_push_hstring_stridx(thr, DUK_STRIDX_LC_NULL); + break; + } + case DUK_TAG_BOOLEAN: { + if (DUK_TVAL_GET_BOOLEAN(tv)) { + duk_push_hstring_stridx(thr, DUK_STRIDX_TRUE); + } else { + duk_push_hstring_stridx(thr, DUK_STRIDX_FALSE); + } + break; + } + case DUK_TAG_STRING: { + /* Nop for actual strings, TypeError for Symbols. + * Because various internals rely on ToString() coercion of + * internal strings, -allow- (NOP) string coercion for hidden + * symbols. + */ +#if 1 + duk_hstring *h; + h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + DUK_ERROR_TYPE(thr, DUK_STR_CANNOT_STRING_COERCE_SYMBOL); + DUK_WO_NORETURN(goto skip_replace;); + } else { + goto skip_replace; + } +#else + goto skip_replace; +#endif + break; + } + case DUK_TAG_BUFFER: /* Go through Uint8Array.prototype.toString() for coercion. */ + case DUK_TAG_OBJECT: { + /* Plain buffers: go through ArrayBuffer.prototype.toString() + * for coercion. + * + * Symbol objects: duk_to_primitive() results in a plain symbol + * value, and duk_to_string() then causes a TypeError. + */ + duk_to_primitive(thr, idx, DUK_HINT_STRING); + DUK_ASSERT(!duk_is_buffer(thr, idx)); /* ToPrimitive() must guarantee */ + DUK_ASSERT(!duk_is_object(thr, idx)); + return duk_to_string(thr, idx); /* Note: recursive call */ + } + case DUK_TAG_POINTER: { + void *ptr = DUK_TVAL_GET_POINTER(tv); + if (ptr != NULL) { + duk_push_sprintf(thr, DUK_STR_FMT_PTR, (void *) ptr); + } else { + /* Represent a null pointer as 'null' to be consistent with + * the JX format variant. Native '%p' format for a NULL + * pointer may be e.g. '(nil)'. + */ + duk_push_hstring_stridx(thr, DUK_STRIDX_LC_NULL); + } + break; + } + case DUK_TAG_LIGHTFUNC: { + /* Should match Function.prototype.toString() */ + duk_push_lightfunc_tostring(thr, tv); + break; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + /* number */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + duk_push_tval(thr, tv); + duk_numconv_stringify(thr, + 10 /*radix*/, + 0 /*precision:shortest*/, + 0 /*force_exponential*/); + break; + } + } + + duk_replace(thr, idx); + + skip_replace: + DUK_ASSERT(duk_is_string(thr, idx)); + return duk_require_string(thr, idx); +} + +DUK_INTERNAL duk_hstring *duk_to_hstring(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *ret; + + DUK_ASSERT_API_ENTRY(thr); + + duk_to_string(thr, idx); + ret = duk_get_hstring(thr, idx); + DUK_ASSERT(ret != NULL); + return ret; +} + +DUK_INTERNAL duk_hstring *duk_to_hstring_m1(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + return duk_to_hstring(thr, -1); +} + +DUK_INTERNAL duk_hstring *duk_to_hstring_acceptsymbol(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *ret; + + DUK_ASSERT_API_ENTRY(thr); + + ret = duk_get_hstring(thr, idx); + if (DUK_UNLIKELY(ret && DUK_HSTRING_HAS_SYMBOL(ret))) { + return ret; + } + return duk_to_hstring(thr, idx); +} + +/* Convert a plain buffer or any buffer object into a string, using the buffer + * bytes 1:1 in the internal string representation. For views the active byte + * slice (not element slice interpreted as an initializer) is used. This is + * necessary in Duktape 2.x because ToString(plainBuffer) no longer creates a + * string with the same bytes as in the buffer but rather (usually) + * '[object ArrayBuffer]'. + */ +DUK_EXTERNAL const char *duk_buffer_to_string(duk_hthread *thr, duk_idx_t idx) { + void *ptr_src; + duk_size_t len; + const char *res; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + + ptr_src = duk_require_buffer_data(thr, idx, &len); + DUK_ASSERT(ptr_src != NULL || len == 0); + + res = duk_push_lstring(thr, (const char *) ptr_src, len); + duk_replace(thr, idx); + return res; +} + +DUK_EXTERNAL void *duk_to_buffer_raw(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size, duk_uint_t mode) { + duk_hbuffer *h_buf; + const duk_uint8_t *src_data; + duk_size_t src_size; + duk_uint8_t *dst_data; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + + h_buf = duk_get_hbuffer(thr, idx); + if (h_buf != NULL) { + /* Buffer is kept as is, with the fixed/dynamic nature of the + * buffer only changed if requested. An external buffer + * is converted into a non-external dynamic buffer in a + * duk_to_dynamic_buffer() call. + */ + duk_uint_t tmp; + duk_uint8_t *tmp_ptr; + + tmp_ptr = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_buf); + src_data = (const duk_uint8_t *) tmp_ptr; + src_size = DUK_HBUFFER_GET_SIZE(h_buf); + + tmp = (DUK_HBUFFER_HAS_DYNAMIC(h_buf) ? DUK_BUF_MODE_DYNAMIC : DUK_BUF_MODE_FIXED); + if ((tmp == mode && !DUK_HBUFFER_HAS_EXTERNAL(h_buf)) || + mode == DUK_BUF_MODE_DONTCARE) { + /* Note: src_data may be NULL if input is a zero-size + * dynamic buffer. + */ + dst_data = tmp_ptr; + goto skip_copy; + } + } else { + /* Non-buffer value is first ToString() coerced, then converted + * to a buffer (fixed buffer is used unless a dynamic buffer is + * explicitly requested). Symbols are rejected with a TypeError. + * XXX: C API could maybe allow symbol-to-buffer coercion? + */ + src_data = (const duk_uint8_t *) duk_to_lstring(thr, idx, &src_size); + } + + dst_data = (duk_uint8_t *) duk_push_buffer(thr, src_size, (mode == DUK_BUF_MODE_DYNAMIC) /*dynamic*/); + /* dst_data may be NULL if size is zero. */ + duk_memcpy_unsafe((void *) dst_data, (const void *) src_data, (size_t) src_size); + + duk_replace(thr, idx); + skip_copy: + + if (out_size) { + *out_size = src_size; + } + return dst_data; +} + +DUK_EXTERNAL void *duk_to_pointer(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + void *res; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + tv = DUK_GET_TVAL_POSIDX(thr, idx); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: + case DUK_TAG_BOOLEAN: + res = NULL; + break; + case DUK_TAG_POINTER: + res = DUK_TVAL_GET_POINTER(tv); + break; + case DUK_TAG_STRING: + case DUK_TAG_OBJECT: + case DUK_TAG_BUFFER: + /* Heap allocated: return heap pointer which is NOT useful + * for the caller, except for debugging. + */ + res = (void *) DUK_TVAL_GET_HEAPHDR(tv); + break; + case DUK_TAG_LIGHTFUNC: + /* Function pointers do not always cast correctly to void * + * (depends on memory and segmentation model for instance), + * so they coerce to NULL. + */ + res = NULL; + break; +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: + /* number */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + res = NULL; + break; + } + + duk_push_pointer(thr, res); + duk_replace(thr, idx); + return res; +} + +DUK_LOCAL void duk__push_func_from_lightfunc(duk_hthread *thr, duk_c_function func, duk_small_uint_t lf_flags) { + duk_idx_t nargs; + duk_uint_t flags = 0; /* shared flags for a subset of types */ + duk_small_uint_t lf_len; + duk_hnatfunc *nf; + + nargs = (duk_idx_t) DUK_LFUNC_FLAGS_GET_NARGS(lf_flags); + if (nargs == DUK_LFUNC_NARGS_VARARGS) { + nargs = (duk_idx_t) DUK_VARARGS; + } + + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_CONSTRUCTABLE | + DUK_HOBJECT_FLAG_CALLABLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_NATFUNC | + DUK_HOBJECT_FLAG_NEWENV | + DUK_HOBJECT_FLAG_STRICT | + DUK_HOBJECT_FLAG_NOTAIL | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION); + (void) duk__push_c_function_raw(thr, func, nargs, flags, DUK_BIDX_NATIVE_FUNCTION_PROTOTYPE); + + lf_len = DUK_LFUNC_FLAGS_GET_LENGTH(lf_flags); + if ((duk_idx_t) lf_len != nargs) { + /* Explicit length is only needed if it differs from 'nargs'. */ + duk_push_int(thr, (duk_int_t) lf_len); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_NONE); + } + +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + duk_push_lightfunc_name_raw(thr, func, lf_flags); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C); +#endif + + nf = duk_known_hnatfunc(thr, -1); + nf->magic = (duk_int16_t) DUK_LFUNC_FLAGS_GET_MAGIC(lf_flags); +} + +DUK_EXTERNAL void duk_to_object(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_uint_t flags = 0; /* shared flags for a subset of types */ + duk_small_int_t proto = 0; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); + tv = DUK_GET_TVAL_POSIDX(thr, idx); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { +#if !defined(DUK_USE_BUFFEROBJECT_SUPPORT) + case DUK_TAG_BUFFER: /* With no bufferobject support, don't object coerce. */ +#endif + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_OBJECT_COERCIBLE); + DUK_WO_NORETURN(return;); + break; + } + case DUK_TAG_BOOLEAN: { + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_BOOLEAN); + proto = DUK_BIDX_BOOLEAN_PROTOTYPE; + goto create_object; + } + case DUK_TAG_STRING: { + duk_hstring *h; + h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_SYMBOL); + proto = DUK_BIDX_SYMBOL_PROTOTYPE; + } else { + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_STRING); + proto = DUK_BIDX_STRING_PROTOTYPE; + } + goto create_object; + } + case DUK_TAG_OBJECT: { + /* nop */ + break; + } +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + case DUK_TAG_BUFFER: { + /* A plain buffer object coerces to a full ArrayBuffer which + * is not fully transparent behavior (ToObject() should be a + * nop for an object). This behavior matches lightfuncs which + * also coerce to an equivalent Function object. There are + * also downsides to defining ToObject(plainBuffer) as a no-op; + * for example duk_to_hobject() could result in a NULL pointer. + */ + duk_hbuffer *h_buf; + + h_buf = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h_buf != NULL); + duk_hbufobj_push_uint8array_from_plain(thr, h_buf); + goto replace_value; + } +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + case DUK_TAG_POINTER: { + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_POINTER); + proto = DUK_BIDX_POINTER_PROTOTYPE; + goto create_object; + } + case DUK_TAG_LIGHTFUNC: { + /* Lightfunc coerces to a Function instance with concrete + * properties. Since 'length' is virtual for Duktape/C + * functions, don't need to define that. The result is made + * extensible to mimic what happens to strings in object + * coercion: + * + * > Object.isExtensible(Object('foo')) + * true + */ + duk_small_uint_t lf_flags; + duk_c_function func; + + DUK_TVAL_GET_LIGHTFUNC(tv, func, lf_flags); + duk__push_func_from_lightfunc(thr, func, lf_flags); + goto replace_value; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_NUMBER); + proto = DUK_BIDX_NUMBER_PROTOTYPE; + goto create_object; + } + } + DUK_ASSERT(duk_is_object(thr, idx)); + return; + + create_object: + (void) duk_push_object_helper(thr, flags, proto); + + /* Note: Boolean prototype's internal value property is not writable, + * but duk_xdef_prop_stridx() disregards the write protection. Boolean + * instances are immutable. + * + * String and buffer special behaviors are already enabled which is not + * ideal, but a write to the internal value is not affected by them. + */ + duk_dup(thr, idx); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE); + + replace_value: + duk_replace(thr, idx); + DUK_ASSERT(duk_is_object(thr, idx)); +} + +DUK_INTERNAL duk_hobject *duk_to_hobject(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *ret; + + DUK_ASSERT_API_ENTRY(thr); + + duk_to_object(thr, idx); + ret = duk_known_hobject(thr, idx); + return ret; +} + +/* + * Type checking + */ + +DUK_LOCAL duk_bool_t duk__tag_check(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t tag) { + duk_tval *tv; + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + return (DUK_TVAL_GET_TAG(tv) == tag); +} + +DUK_LOCAL duk_bool_t duk__obj_flag_any_default_false(duk_hthread *thr, duk_idx_t idx, duk_uint_t flag_mask) { + duk_hobject *obj; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_get_hobject(thr, idx); + if (obj) { + return (DUK_HEAPHDR_CHECK_FLAG_BITS((duk_heaphdr *) obj, flag_mask) ? 1 : 0); + } + return 0; +} + +DUK_INTERNAL duk_int_t duk_get_type_tval(duk_tval *tv) { + DUK_ASSERT(tv != NULL); + +#if defined(DUK_USE_PACKED_TVAL) + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNUSED: + return DUK_TYPE_NONE; + case DUK_TAG_UNDEFINED: + return DUK_TYPE_UNDEFINED; + case DUK_TAG_NULL: + return DUK_TYPE_NULL; + case DUK_TAG_BOOLEAN: + return DUK_TYPE_BOOLEAN; + case DUK_TAG_STRING: + return DUK_TYPE_STRING; + case DUK_TAG_OBJECT: + return DUK_TYPE_OBJECT; + case DUK_TAG_BUFFER: + return DUK_TYPE_BUFFER; + case DUK_TAG_POINTER: + return DUK_TYPE_POINTER; + case DUK_TAG_LIGHTFUNC: + return DUK_TYPE_LIGHTFUNC; +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: + /* Note: number has no explicit tag (in 8-byte representation) */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + return DUK_TYPE_NUMBER; + } +#else /* DUK_USE_PACKED_TVAL */ + DUK_ASSERT(DUK_TVAL_IS_VALID_TAG(tv)); + DUK_ASSERT(sizeof(duk__type_from_tag) / sizeof(duk_uint_t) == DUK_TAG_MAX - DUK_TAG_MIN + 1); + return (duk_int_t) duk__type_from_tag[DUK_TVAL_GET_TAG(tv) - DUK_TAG_MIN]; +#endif /* DUK_USE_PACKED_TVAL */ +} + +DUK_EXTERNAL duk_int_t duk_get_type(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + return duk_get_type_tval(tv); +} + +#if defined(DUK_USE_VERBOSE_ERRORS) && defined(DUK_USE_PARANOID_ERRORS) +DUK_LOCAL const char * const duk__type_names[] = { + "none", + "undefined", + "null", + "boolean", + "number", + "string", + "object", + "buffer", + "pointer", + "lightfunc" +}; + +DUK_INTERNAL const char *duk_get_type_name(duk_hthread *thr, duk_idx_t idx) { + duk_int_t type_tag; + + DUK_ASSERT_API_ENTRY(thr); + + type_tag = duk_get_type(thr, idx); + DUK_ASSERT(type_tag >= DUK_TYPE_MIN && type_tag <= DUK_TYPE_MAX); + DUK_ASSERT(DUK_TYPE_MIN == 0 && sizeof(duk__type_names) / sizeof(const char *) == DUK_TYPE_MAX + 1); + + return duk__type_names[type_tag]; +} +#endif /* DUK_USE_VERBOSE_ERRORS && DUK_USE_PARANOID_ERRORS */ + +DUK_INTERNAL duk_small_uint_t duk_get_class_number(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_hobject *obj; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_OBJECT: + obj = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(obj != NULL); + return DUK_HOBJECT_GET_CLASS_NUMBER(obj); + case DUK_TAG_BUFFER: + /* Buffers behave like Uint8Array objects. */ + return DUK_HOBJECT_CLASS_UINT8ARRAY; + case DUK_TAG_LIGHTFUNC: + /* Lightfuncs behave like Function objects. */ + return DUK_HOBJECT_CLASS_FUNCTION; + default: + /* Primitive or UNUSED, no class number. */ + return DUK_HOBJECT_CLASS_NONE; + } +} + +DUK_EXTERNAL duk_bool_t duk_check_type(duk_hthread *thr, duk_idx_t idx, duk_int_t type) { + DUK_ASSERT_API_ENTRY(thr); + + return (duk_get_type(thr, idx) == type) ? 1 : 0; +} + +DUK_INTERNAL duk_uint_t duk_get_type_mask_tval(duk_tval *tv) { + DUK_ASSERT(tv != NULL); + +#if defined(DUK_USE_PACKED_TVAL) + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNUSED: + return DUK_TYPE_MASK_NONE; + case DUK_TAG_UNDEFINED: + return DUK_TYPE_MASK_UNDEFINED; + case DUK_TAG_NULL: + return DUK_TYPE_MASK_NULL; + case DUK_TAG_BOOLEAN: + return DUK_TYPE_MASK_BOOLEAN; + case DUK_TAG_STRING: + return DUK_TYPE_MASK_STRING; + case DUK_TAG_OBJECT: + return DUK_TYPE_MASK_OBJECT; + case DUK_TAG_BUFFER: + return DUK_TYPE_MASK_BUFFER; + case DUK_TAG_POINTER: + return DUK_TYPE_MASK_POINTER; + case DUK_TAG_LIGHTFUNC: + return DUK_TYPE_MASK_LIGHTFUNC; +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: + /* Note: number has no explicit tag (in 8-byte representation) */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + return DUK_TYPE_MASK_NUMBER; + } +#else /* DUK_USE_PACKED_TVAL */ + DUK_ASSERT(DUK_TVAL_IS_VALID_TAG(tv)); + DUK_ASSERT(sizeof(duk__type_mask_from_tag) / sizeof(duk_uint_t) == DUK_TAG_MAX - DUK_TAG_MIN + 1); + return duk__type_mask_from_tag[DUK_TVAL_GET_TAG(tv) - DUK_TAG_MIN]; +#endif /* DUK_USE_PACKED_TVAL */ +} + +DUK_EXTERNAL duk_uint_t duk_get_type_mask(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + return duk_get_type_mask_tval(tv); +} + +DUK_EXTERNAL duk_bool_t duk_check_type_mask(duk_hthread *thr, duk_idx_t idx, duk_uint_t mask) { + DUK_ASSERT_API_ENTRY(thr); + + if (DUK_LIKELY((duk_get_type_mask(thr, idx) & mask) != 0U)) { + return 1; + } + if (mask & DUK_TYPE_MASK_THROW) { + DUK_ERROR_TYPE(thr, DUK_STR_UNEXPECTED_TYPE); + DUK_WO_NORETURN(return 0;); + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_undefined(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_UNDEFINED); +} + +DUK_EXTERNAL duk_bool_t duk_is_null(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_NULL); +} + +DUK_EXTERNAL duk_bool_t duk_is_boolean(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_BOOLEAN); +} + +DUK_EXTERNAL duk_bool_t duk_is_number(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + /* + * Number is special because it doesn't have a specific + * tag in the 8-byte representation. + */ + + /* XXX: shorter version for unpacked representation? */ + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + return DUK_TVAL_IS_NUMBER(tv); +} + +DUK_EXTERNAL duk_bool_t duk_is_nan(duk_hthread *thr, duk_idx_t idx) { + /* XXX: This will now return false for non-numbers, even though they would + * coerce to NaN (as a general rule). In particular, duk_get_number() + * returns a NaN for non-numbers, so should this function also return + * true for non-numbers? + */ + + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + + /* XXX: for packed duk_tval an explicit "is number" check is unnecessary */ + if (!DUK_TVAL_IS_NUMBER(tv)) { + return 0; + } + return (duk_bool_t) DUK_ISNAN(DUK_TVAL_GET_NUMBER(tv)); +} + +DUK_EXTERNAL duk_bool_t duk_is_string(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_STRING); +} + +DUK_INTERNAL duk_bool_t duk_is_string_notsymbol(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk_get_hstring_notsymbol(thr, idx) != NULL; +} + +DUK_EXTERNAL duk_bool_t duk_is_object(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_OBJECT); +} + +DUK_EXTERNAL duk_bool_t duk_is_buffer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_BUFFER); +} + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_EXTERNAL duk_bool_t duk_is_buffer_data(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_BUFFER(tv)) { + return 1; + } else if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (DUK_HOBJECT_IS_BUFOBJ(h)) { + return 1; + } + } + return 0; +} +#else /* DUK_USE_BUFFEROBJECT_SUPPORT */ +DUK_EXTERNAL duk_bool_t duk_is_buffer_data(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + + return duk_is_buffer(thr, idx); +} + +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +DUK_EXTERNAL duk_bool_t duk_is_pointer(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_POINTER); +} + +DUK_EXTERNAL duk_bool_t duk_is_lightfunc(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__tag_check(thr, idx, DUK_TAG_LIGHTFUNC); +} + +DUK_EXTERNAL duk_bool_t duk_is_symbol(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + DUK_ASSERT_API_ENTRY(thr); + h = duk_get_hstring(thr, idx); + /* Use DUK_LIKELY() here because caller may be more likely to type + * check an expected symbol than not. + */ + if (DUK_LIKELY(h != NULL && DUK_HSTRING_HAS_SYMBOL(h))) { + return 1; + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_array(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *obj; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_get_hobject(thr, idx); + if (obj) { + return (DUK_HOBJECT_GET_CLASS_NUMBER(obj) == DUK_HOBJECT_CLASS_ARRAY ? 1 : 0); + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_function(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + return DUK_HOBJECT_HAS_CALLABLE(h) ? 1 : 0; + } + if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + return 1; + } + return 0; +} + +DUK_INTERNAL duk_bool_t duk_is_callable_tval(duk_hthread *thr, duk_tval *tv) { + DUK_ASSERT_API_ENTRY(thr); + + DUK_UNREF(thr); + + if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + return DUK_HOBJECT_HAS_CALLABLE(h) ? 1 : 0; + } + if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + return 1; + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_constructable(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + return DUK_HOBJECT_HAS_CONSTRUCTABLE(h) ? 1 : 0; + } + if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + return 1; + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_c_function(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__obj_flag_any_default_false(thr, + idx, + DUK_HOBJECT_FLAG_NATFUNC); +} + +DUK_EXTERNAL duk_bool_t duk_is_ecmascript_function(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__obj_flag_any_default_false(thr, + idx, + DUK_HOBJECT_FLAG_COMPFUNC); +} + +DUK_EXTERNAL duk_bool_t duk_is_bound_function(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk__obj_flag_any_default_false(thr, + idx, + DUK_HOBJECT_FLAG_BOUNDFUNC); +} + +DUK_EXTERNAL duk_bool_t duk_is_thread(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *obj; + + DUK_ASSERT_API_ENTRY(thr); + + obj = duk_get_hobject(thr, idx); + if (obj) { + return (DUK_HOBJECT_GET_CLASS_NUMBER(obj) == DUK_HOBJECT_CLASS_THREAD ? 1 : 0); + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_fixed_buffer(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_BUFFER(tv)) { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + return (DUK_HBUFFER_HAS_DYNAMIC(h) ? 0 : 1); + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_dynamic_buffer(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_BUFFER(tv)) { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + return (DUK_HBUFFER_HAS_DYNAMIC(h) && !DUK_HBUFFER_HAS_EXTERNAL(h) ? 1 : 0); + } + return 0; +} + +DUK_EXTERNAL duk_bool_t duk_is_external_buffer(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_get_tval_or_unused(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_BUFFER(tv)) { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + return (DUK_HBUFFER_HAS_DYNAMIC(h) && DUK_HBUFFER_HAS_EXTERNAL(h) ? 1 : 0); + } + return 0; +} + +DUK_EXTERNAL duk_errcode_t duk_get_error_code(duk_hthread *thr, duk_idx_t idx) { + duk_hobject *h; + duk_uint_t sanity; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_get_hobject(thr, idx); + + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + if (!h) { + return DUK_ERR_NONE; + } + + /* XXX: something more convenient? */ + + if (h == thr->builtins[DUK_BIDX_EVAL_ERROR_PROTOTYPE]) { + return DUK_ERR_EVAL_ERROR; + } + if (h == thr->builtins[DUK_BIDX_RANGE_ERROR_PROTOTYPE]) { + return DUK_ERR_RANGE_ERROR; + } + if (h == thr->builtins[DUK_BIDX_REFERENCE_ERROR_PROTOTYPE]) { + return DUK_ERR_REFERENCE_ERROR; + } + if (h == thr->builtins[DUK_BIDX_SYNTAX_ERROR_PROTOTYPE]) { + return DUK_ERR_SYNTAX_ERROR; + } + if (h == thr->builtins[DUK_BIDX_TYPE_ERROR_PROTOTYPE]) { + return DUK_ERR_TYPE_ERROR; + } + if (h == thr->builtins[DUK_BIDX_URI_ERROR_PROTOTYPE]) { + return DUK_ERR_URI_ERROR; + } + if (h == thr->builtins[DUK_BIDX_ERROR_PROTOTYPE]) { + return DUK_ERR_ERROR; + } + + h = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h); + } while (--sanity > 0); + + return DUK_ERR_NONE; +} + +/* + * Pushers + */ + +DUK_INTERNAL void duk_push_tval(duk_hthread *thr, duk_tval *tv) { + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(tv != NULL); + + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_TVAL(tv_slot, tv); + DUK_TVAL_INCREF(thr, tv); /* no side effects */ +} + +DUK_EXTERNAL void duk_push_undefined(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + DUK__CHECK_SPACE(); + + /* Because value stack init policy is 'undefined above top', + * we don't need to write, just assert. + */ + thr->valstack_top++; + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top - 1)); +} + +DUK_EXTERNAL void duk_push_null(duk_hthread *thr) { + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_NULL(tv_slot); +} + +DUK_EXTERNAL void duk_push_boolean(duk_hthread *thr, duk_bool_t val) { + duk_tval *tv_slot; + duk_small_int_t b; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + b = (val ? 1 : 0); /* ensure value is 1 or 0 (not other non-zero) */ + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_BOOLEAN(tv_slot, b); +} + +DUK_EXTERNAL void duk_push_true(duk_hthread *thr) { + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_BOOLEAN_TRUE(tv_slot); +} + +DUK_EXTERNAL void duk_push_false(duk_hthread *thr) { + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_BOOLEAN_FALSE(tv_slot); +} + +/* normalize NaN which may not match our canonical internal NaN */ +DUK_EXTERNAL void duk_push_number(duk_hthread *thr, duk_double_t val) { + duk_tval *tv_slot; + duk_double_union du; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + du.d = val; + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_NUMBER(tv_slot, du.d); +} + +DUK_EXTERNAL void duk_push_int(duk_hthread *thr, duk_int_t val) { +#if defined(DUK_USE_FASTINT) + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; +#if DUK_INT_MAX <= 0x7fffffffL + DUK_TVAL_SET_I32(tv_slot, (duk_int32_t) val); +#else + if (val >= DUK_FASTINT_MIN && val <= DUK_FASTINT_MAX) { + DUK_TVAL_SET_FASTINT(tv_slot, (duk_int64_t) val); + } else { + duk_double_t = (duk_double_t) val; + DUK_TVAL_SET_NUMBER(tv_slot, d); + } +#endif +#else /* DUK_USE_FASTINT */ + duk_tval *tv_slot; + duk_double_t d; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + d = (duk_double_t) val; + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_NUMBER(tv_slot, d); +#endif /* DUK_USE_FASTINT */ +} + +DUK_EXTERNAL void duk_push_uint(duk_hthread *thr, duk_uint_t val) { +#if defined(DUK_USE_FASTINT) + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; +#if DUK_UINT_MAX <= 0xffffffffUL + DUK_TVAL_SET_U32(tv_slot, (duk_uint32_t) val); +#else + if (val <= DUK_FASTINT_MAX) { /* val is unsigned so >= 0 */ + /* XXX: take advantage of val being unsigned, no need to mask */ + DUK_TVAL_SET_FASTINT(tv_slot, (duk_int64_t) val); + } else { + duk_double_t = (duk_double_t) val; + DUK_TVAL_SET_NUMBER(tv_slot, d); + } +#endif +#else /* DUK_USE_FASTINT */ + duk_tval *tv_slot; + duk_double_t d; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + d = (duk_double_t) val; + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_NUMBER(tv_slot, d); +#endif /* DUK_USE_FASTINT */ +} + +DUK_EXTERNAL void duk_push_nan(duk_hthread *thr) { + duk_tval *tv_slot; + duk_double_union du; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + DUK_DBLUNION_SET_NAN(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_NUMBER(tv_slot, du.d); +} + +DUK_EXTERNAL const char *duk_push_lstring(duk_hthread *thr, const char *str, duk_size_t len) { + duk_hstring *h; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + + /* Check stack before interning (avoid hanging temp). */ + DUK__CHECK_SPACE(); + + /* NULL with zero length represents an empty string; NULL with higher + * length is also now treated like an empty string although it is + * a bit dubious. This is unlike duk_push_string() which pushes a + * 'null' if the input string is a NULL. + */ + if (DUK_UNLIKELY(str == NULL)) { + len = 0U; + } + + /* Check for maximum string length. */ + if (DUK_UNLIKELY(len > DUK_HSTRING_MAX_BYTELEN)) { + DUK_ERROR_RANGE(thr, DUK_STR_STRING_TOO_LONG); + DUK_WO_NORETURN(return NULL;); + } + + h = duk_heap_strtable_intern_checked(thr, (const duk_uint8_t *) str, (duk_uint32_t) len); + DUK_ASSERT(h != NULL); + + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_STRING(tv_slot, h); + DUK_HSTRING_INCREF(thr, h); /* no side effects */ + + return (const char *) DUK_HSTRING_GET_DATA(h); +} + +DUK_EXTERNAL const char *duk_push_string(duk_hthread *thr, const char *str) { + DUK_ASSERT_API_ENTRY(thr); + + if (str) { + return duk_push_lstring(thr, str, DUK_STRLEN(str)); + } else { + duk_push_null(thr); + return NULL; + } +} + +#if !defined(DUK_USE_PREFER_SIZE) +#if defined(DUK_USE_LITCACHE_SIZE) +DUK_EXTERNAL const char *duk_push_literal_raw(duk_hthread *thr, const char *str, duk_size_t len) { + duk_hstring *h; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(str != NULL); + DUK_ASSERT(str[len] == (char) 0); + + /* Check for maximum string length. */ + if (DUK_UNLIKELY(len > DUK_HSTRING_MAX_BYTELEN)) { + DUK_ERROR_RANGE(thr, DUK_STR_STRING_TOO_LONG); + DUK_WO_NORETURN(return NULL;); + } + + h = duk_heap_strtable_intern_literal_checked(thr, (const duk_uint8_t *) str, (duk_uint32_t) len); + DUK_ASSERT(h != NULL); + + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_STRING(tv_slot, h); + DUK_HSTRING_INCREF(thr, h); /* no side effects */ + + return (const char *) DUK_HSTRING_GET_DATA(h); +} +#else /* DUK_USE_LITCACHE_SIZE */ +DUK_EXTERNAL const char *duk_push_literal_raw(duk_hthread *thr, const char *str, duk_size_t len) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(str != NULL); + DUK_ASSERT(str[len] == (char) 0); + + return duk_push_lstring(thr, str, len); +} +#endif /* DUK_USE_LITCACHE_SIZE */ +#endif /* !DUK_USE_PREFER_SIZE */ + +DUK_EXTERNAL void duk_push_pointer(duk_hthread *thr, void *val) { + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK__CHECK_SPACE(); + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_POINTER(tv_slot, val); +} + +DUK_INTERNAL duk_hstring *duk_push_uint_to_hstring(duk_hthread *thr, duk_uint_t i) { + duk_hstring *h_tmp; + + DUK_ASSERT_API_ENTRY(thr); + + /* XXX: this could be a direct DUK_SPRINTF to a buffer followed by duk_push_string() */ + duk_push_uint(thr, (duk_uint_t) i); + h_tmp = duk_to_hstring_m1(thr); + DUK_ASSERT(h_tmp != NULL); + return h_tmp; +} + +DUK_LOCAL void duk__push_this_helper(duk_hthread *thr, duk_small_uint_t check_object_coercible) { + duk_tval *tv_slot; + + DUK__CHECK_SPACE(); + + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); /* because of valstack init policy */ + tv_slot = thr->valstack_top++; + + if (DUK_UNLIKELY(thr->callstack_curr == NULL)) { + if (check_object_coercible) { + goto type_error; + } + /* 'undefined' already on stack top */ + } else { + duk_tval *tv; + + /* 'this' binding is just before current activation's bottom */ + DUK_ASSERT(thr->valstack_bottom > thr->valstack); + tv = thr->valstack_bottom - 1; + if (check_object_coercible && + (DUK_TVAL_IS_UNDEFINED(tv) || DUK_TVAL_IS_NULL(tv))) { + /* XXX: better macro for DUK_TVAL_IS_UNDEFINED_OR_NULL(tv) */ + goto type_error; + } + + DUK_TVAL_SET_TVAL(tv_slot, tv); + DUK_TVAL_INCREF(thr, tv); + } + return; + + type_error: + DUK_ERROR_TYPE(thr, DUK_STR_NOT_OBJECT_COERCIBLE); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_push_this(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + duk__push_this_helper(thr, 0 /*check_object_coercible*/); +} + +DUK_INTERNAL void duk_push_this_check_object_coercible(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + duk__push_this_helper(thr, 1 /*check_object_coercible*/); +} + +DUK_INTERNAL duk_hobject *duk_push_this_coercible_to_object(duk_hthread *thr) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + duk__push_this_helper(thr, 1 /*check_object_coercible*/); + h = duk_to_hobject(thr, -1); + DUK_ASSERT(h != NULL); + return h; +} + +DUK_INTERNAL duk_hstring *duk_push_this_coercible_to_string(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + duk__push_this_helper(thr, 1 /*check_object_coercible*/); + return duk_to_hstring_m1(thr); /* This will reject all Symbol values; accepts Symbol objects. */ +} + +DUK_INTERNAL duk_tval *duk_get_borrowed_this_tval(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + DUK_ASSERT(thr->callstack_top > 0); /* caller required to know */ + DUK_ASSERT(thr->callstack_curr != NULL); /* caller required to know */ + DUK_ASSERT(thr->valstack_bottom > thr->valstack); /* consequence of above */ + DUK_ASSERT(thr->valstack_bottom - 1 >= thr->valstack); /* 'this' binding exists */ + + return thr->valstack_bottom - 1; +} + +DUK_EXTERNAL void duk_push_new_target(duk_hthread *thr) { + duk_activation *act; + + DUK_ASSERT_API_ENTRY(thr); + + /* https://www.ecma-international.org/ecma-262/6.0/#sec-meta-properties-runtime-semantics-evaluation + * https://www.ecma-international.org/ecma-262/6.0/#sec-getnewtarget + * + * No newTarget support now, so as a first approximation + * use the resolved (non-bound) target function. + * + * Check CONSTRUCT flag from current function, or if running + * direct eval, from a non-direct-eval parent (with possibly + * more than one nested direct eval). An alternative to this + * would be to store [[NewTarget]] as a hidden symbol of the + * lexical scope, and then just look up that variable. + * + * Calls from the application will either be for an empty + * call stack, or a Duktape/C function as the top activation. + */ + + act = thr->callstack_curr; + for (;;) { + if (act == NULL) { + break; + } + + if (act->flags & DUK_ACT_FLAG_CONSTRUCT) { + duk_push_tval(thr, &act->tv_func); + return; + } else if (act->flags & DUK_ACT_FLAG_DIRECT_EVAL) { + act = act->parent; + } else { + break; + } + } + + duk_push_undefined(thr); +} + +DUK_EXTERNAL void duk_push_current_function(duk_hthread *thr) { + duk_activation *act; + + DUK_ASSERT_API_ENTRY(thr); + + act = thr->callstack_curr; + if (act != NULL) { + duk_push_tval(thr, &act->tv_func); + } else { + duk_push_undefined(thr); + } +} + +DUK_EXTERNAL void duk_push_current_thread(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + if (thr->heap->curr_thread) { + duk_push_hobject(thr, (duk_hobject *) thr->heap->curr_thread); + } else { + duk_push_undefined(thr); + } +} + +DUK_EXTERNAL void duk_push_global_object(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + duk_push_hobject_bidx(thr, DUK_BIDX_GLOBAL); +} + +/* XXX: size optimize */ +DUK_LOCAL void duk__push_stash(duk_hthread *thr) { + if (!duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE)) { + DUK_DDD(DUK_DDDPRINT("creating heap/global/thread stash on first use")); + duk_pop_unsafe(thr); + duk_push_bare_object(thr); + duk_dup_top(thr); + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_C); /* [ ... parent stash stash ] -> [ ... parent stash ] */ + } + duk_remove_m2(thr); +} + +DUK_EXTERNAL void duk_push_heap_stash(duk_hthread *thr) { + duk_heap *heap; + DUK_ASSERT_API_ENTRY(thr); + heap = thr->heap; + DUK_ASSERT(heap->heap_object != NULL); + duk_push_hobject(thr, heap->heap_object); + duk__push_stash(thr); +} + +DUK_EXTERNAL void duk_push_global_stash(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_push_global_object(thr); + duk__push_stash(thr); +} + +DUK_EXTERNAL void duk_push_thread_stash(duk_hthread *thr, duk_hthread *target_thr) { + DUK_ASSERT_API_ENTRY(thr); + if (DUK_UNLIKELY(target_thr == NULL)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return;); + } + duk_push_hobject(thr, (duk_hobject *) target_thr); + duk__push_stash(thr); +} + +/* XXX: duk_ssize_t would be useful here */ +DUK_LOCAL duk_int_t duk__try_push_vsprintf(duk_hthread *thr, void *buf, duk_size_t sz, const char *fmt, va_list ap) { + duk_int_t len; + + DUK_ASSERT_CTX_VALID(thr); + DUK_UNREF(thr); + + /* NUL terminator handling doesn't matter here */ + len = DUK_VSNPRINTF((char *) buf, sz, fmt, ap); + if (len < (duk_int_t) sz) { + /* Return value of 'sz' or more indicates output was (potentially) + * truncated. + */ + return (duk_int_t) len; + } + return -1; +} + +DUK_EXTERNAL const char *duk_push_vsprintf(duk_hthread *thr, const char *fmt, va_list ap) { + duk_uint8_t stack_buf[DUK_PUSH_SPRINTF_INITIAL_SIZE]; + duk_size_t sz = DUK_PUSH_SPRINTF_INITIAL_SIZE; + duk_bool_t pushed_buf = 0; + void *buf; + duk_int_t len; /* XXX: duk_ssize_t */ + const char *res; + + DUK_ASSERT_API_ENTRY(thr); + + /* special handling of fmt==NULL */ + if (!fmt) { + duk_hstring *h_str; + duk_push_hstring_empty(thr); + h_str = duk_known_hstring(thr, -1); + return (const char *) DUK_HSTRING_GET_DATA(h_str); + } + + /* initial estimate based on format string */ + sz = DUK_STRLEN(fmt) + 16; /* format plus something to avoid just missing */ + if (sz < DUK_PUSH_SPRINTF_INITIAL_SIZE) { + sz = DUK_PUSH_SPRINTF_INITIAL_SIZE; + } + DUK_ASSERT(sz > 0); + + /* Try to make do with a stack buffer to avoid allocating a temporary buffer. + * This works 99% of the time which is quite nice. + */ + for (;;) { + va_list ap_copy; /* copied so that 'ap' can be reused */ + + if (sz <= sizeof(stack_buf)) { + buf = stack_buf; + } else if (!pushed_buf) { + pushed_buf = 1; + buf = duk_push_dynamic_buffer(thr, sz); + } else { + buf = duk_resize_buffer(thr, -1, sz); + } + DUK_ASSERT(buf != NULL); + + DUK_VA_COPY(ap_copy, ap); + len = duk__try_push_vsprintf(thr, buf, sz, fmt, ap_copy); + va_end(ap_copy); + if (len >= 0) { + break; + } + + /* failed, resize and try again */ + sz = sz * 2; + if (DUK_UNLIKELY(sz >= DUK_PUSH_SPRINTF_SANITY_LIMIT)) { + DUK_ERROR_RANGE(thr, DUK_STR_RESULT_TOO_LONG); + DUK_WO_NORETURN(return NULL;); + } + } + + /* Cannot use duk_buffer_to_string() on the buffer because it is + * usually larger than 'len'; 'buf' is also usually a stack buffer. + */ + res = duk_push_lstring(thr, (const char *) buf, (duk_size_t) len); /* [ buf? res ] */ + if (pushed_buf) { + duk_remove_m2(thr); + } + return res; +} + +DUK_EXTERNAL const char *duk_push_sprintf(duk_hthread *thr, const char *fmt, ...) { + va_list ap; + const char *ret; + + DUK_ASSERT_API_ENTRY(thr); + + /* allow fmt==NULL */ + va_start(ap, fmt); + ret = duk_push_vsprintf(thr, fmt, ap); + va_end(ap); + + return ret; +} + +DUK_INTERNAL duk_hobject *duk_push_object_helper(duk_hthread *thr, duk_uint_t hobject_flags_and_class, duk_small_int_t prototype_bidx) { + duk_tval *tv_slot; + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(prototype_bidx == -1 || + (prototype_bidx >= 0 && prototype_bidx < DUK_NUM_BUILTINS)); + + DUK__CHECK_SPACE(); + + h = duk_hobject_alloc(thr, hobject_flags_and_class); + DUK_ASSERT(h != NULL); + + DUK_DDD(DUK_DDDPRINT("created object with flags: 0x%08lx", (unsigned long) h->hdr.h_flags)); + + tv_slot = thr->valstack_top; + DUK_TVAL_SET_OBJECT(tv_slot, h); + DUK_HOBJECT_INCREF(thr, h); /* no side effects */ + thr->valstack_top++; + + /* object is now reachable */ + + if (prototype_bidx >= 0) { + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, h, thr->builtins[prototype_bidx]); + } else { + DUK_ASSERT(prototype_bidx == -1); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h) == NULL); + } + + return h; +} + +DUK_INTERNAL duk_hobject *duk_push_object_helper_proto(duk_hthread *thr, duk_uint_t hobject_flags_and_class, duk_hobject *proto) { + duk_hobject *h; + + DUK_ASSERT_API_ENTRY(thr); + + h = duk_push_object_helper(thr, hobject_flags_and_class, -1); + DUK_ASSERT(h != NULL); + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, h, proto); + return h; +} + +DUK_EXTERNAL duk_idx_t duk_push_object(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), + DUK_BIDX_OBJECT_PROTOTYPE); + return duk_get_top_index_unsafe(thr); +} + +DUK_EXTERNAL duk_idx_t duk_push_array(duk_hthread *thr) { + duk_uint_t flags; + duk_harray *obj; + duk_idx_t ret; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_ARRAY_PART | + DUK_HOBJECT_FLAG_EXOTIC_ARRAY | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARRAY); + + obj = duk_harray_alloc(thr, flags); + DUK_ASSERT(obj != NULL); + + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) obj, thr->builtins[DUK_BIDX_ARRAY_PROTOTYPE]); + + tv_slot = thr->valstack_top; + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) obj); + DUK_HOBJECT_INCREF(thr, obj); /* XXX: could preallocate with refcount = 1 */ + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + thr->valstack_top++; + + DUK_ASSERT(obj->length == 0); /* Array .length starts at zero. */ + return ret; +} + +DUK_INTERNAL duk_harray *duk_push_harray(duk_hthread *thr) { + /* XXX: API call could do this directly, cast to void in API macro. */ + duk_harray *a; + + DUK_ASSERT_API_ENTRY(thr); + + (void) duk_push_array(thr); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(thr->valstack_top - 1)); + a = (duk_harray *) DUK_TVAL_GET_OBJECT(thr->valstack_top - 1); + DUK_ASSERT(a != NULL); + return a; +} + +/* Push a duk_harray with preallocated size (.length also set to match size). + * Caller may then populate array part of the duk_harray directly. + */ +DUK_INTERNAL duk_harray *duk_push_harray_with_size(duk_hthread *thr, duk_uint32_t size) { + duk_harray *a; + + DUK_ASSERT_API_ENTRY(thr); + + a = duk_push_harray(thr); + + duk_hobject_realloc_props(thr, + (duk_hobject *) a, + 0, + size, + 0, + 0); + a->length = size; + return a; +} + +DUK_INTERNAL duk_tval *duk_push_harray_with_size_outptr(duk_hthread *thr, duk_uint32_t size) { + duk_harray *a; + + DUK_ASSERT_API_ENTRY(thr); + + a = duk_push_harray_with_size(thr, size); + DUK_ASSERT(a != NULL); + return DUK_HOBJECT_A_GET_BASE(thr->heap, (duk_hobject *) a); +} + +DUK_EXTERNAL duk_idx_t duk_push_thread_raw(duk_hthread *thr, duk_uint_t flags) { + duk_hthread *obj; + duk_idx_t ret; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + + DUK__CHECK_SPACE(); + + obj = duk_hthread_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_THREAD)); + DUK_ASSERT(obj != NULL); + obj->state = DUK_HTHREAD_STATE_INACTIVE; +#if defined(DUK_USE_ROM_STRINGS) + /* Nothing to initialize, strs[] is in ROM. */ +#else +#if defined(DUK_USE_HEAPPTR16) + obj->strs16 = thr->strs16; +#else + obj->strs = thr->strs; +#endif +#endif + DUK_DDD(DUK_DDDPRINT("created thread object with flags: 0x%08lx", (unsigned long) obj->obj.hdr.h_flags)); + + /* make the new thread reachable */ + tv_slot = thr->valstack_top; + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) obj); + DUK_HTHREAD_INCREF(thr, obj); + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + thr->valstack_top++; + + /* important to do this *after* pushing, to make the thread reachable for gc */ + if (DUK_UNLIKELY(!duk_hthread_init_stacks(thr->heap, obj))) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return 0;); + } + + /* initialize built-ins - either by copying or creating new ones */ + if (flags & DUK_THREAD_NEW_GLOBAL_ENV) { + duk_hthread_create_builtin_objects(obj); + } else { + duk_hthread_copy_builtin_objects(thr, obj); + } + + /* default prototype */ + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) obj, obj->builtins[DUK_BIDX_THREAD_PROTOTYPE]); + + /* Initial stack size satisfies the stack slack constraints so there + * is no need to require stack here. + */ + DUK_ASSERT(DUK_VALSTACK_INITIAL_SIZE >= + DUK_VALSTACK_API_ENTRY_MINIMUM + DUK_VALSTACK_INTERNAL_EXTRA); + + return ret; +} + +DUK_INTERNAL duk_hcompfunc *duk_push_hcompfunc(duk_hthread *thr) { + duk_hcompfunc *obj; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + + DUK__CHECK_SPACE(); + + /* Template functions are not strictly constructable (they don't + * have a "prototype" property for instance), so leave the + * DUK_HOBJECT_FLAG_CONSRUCTABLE flag cleared here. + */ + + obj = duk_hcompfunc_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_CALLABLE | + DUK_HOBJECT_FLAG_COMPFUNC | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION)); + if (DUK_UNLIKELY(obj == NULL)) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); + } + + DUK_DDD(DUK_DDDPRINT("created compiled function object with flags: 0x%08lx", (unsigned long) obj->obj.hdr.h_flags)); + + tv_slot = thr->valstack_top; + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) obj); + DUK_HOBJECT_INCREF(thr, obj); + thr->valstack_top++; + + /* default prototype */ + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) obj) == NULL); + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) obj, thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); + + return obj; +} + +DUK_INTERNAL duk_hboundfunc *duk_push_hboundfunc(duk_hthread *thr) { + duk_hboundfunc *obj; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + + DUK__CHECK_SPACE(); + obj = duk_hboundfunc_alloc(thr->heap, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BOUNDFUNC | + DUK_HOBJECT_FLAG_CONSTRUCTABLE | + DUK_HOBJECT_FLAG_CALLABLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION)); + if (!obj) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); + } + + tv_slot = thr->valstack_top++; + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) obj); + DUK_HOBJECT_INCREF(thr, obj); + + /* Prototype is left as NULL because the caller always sets it (and + * it depends on the target function). + */ + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) obj) == NULL); + + return obj; +} + +DUK_LOCAL duk_idx_t duk__push_c_function_raw(duk_hthread *thr, duk_c_function func, duk_idx_t nargs, duk_uint_t flags, duk_small_uint_t proto_bidx) { + duk_hnatfunc *obj; + duk_idx_t ret; + duk_tval *tv_slot; + duk_int16_t func_nargs; + + DUK_ASSERT_CTX_VALID(thr); + + DUK__CHECK_SPACE(); + + if (DUK_UNLIKELY(func == NULL)) { + goto api_error; + } + if (nargs >= 0 && nargs < DUK_HNATFUNC_NARGS_MAX) { + func_nargs = (duk_int16_t) nargs; + } else if (nargs == DUK_VARARGS) { + func_nargs = DUK_HNATFUNC_NARGS_VARARGS; + } else { + goto api_error; + } + + obj = duk_hnatfunc_alloc(thr, flags); + DUK_ASSERT(obj != NULL); + + obj->func = func; + obj->nargs = func_nargs; + + DUK_DDD(DUK_DDDPRINT("created native function object with flags: 0x%08lx, nargs=%ld", + (unsigned long) obj->obj.hdr.h_flags, (long) obj->nargs)); + + tv_slot = thr->valstack_top; + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) obj); + DUK_HOBJECT_INCREF(thr, obj); + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + thr->valstack_top++; + + DUK_ASSERT_BIDX_VALID(proto_bidx); + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) obj, thr->builtins[proto_bidx]); + return ret; + + api_error: + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); +} + +DUK_EXTERNAL duk_idx_t duk_push_c_function(duk_hthread *thr, duk_c_function func, duk_int_t nargs) { + duk_uint_t flags; + + DUK_ASSERT_API_ENTRY(thr); + + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_CONSTRUCTABLE | + DUK_HOBJECT_FLAG_CALLABLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_NATFUNC | + DUK_HOBJECT_FLAG_NEWENV | + DUK_HOBJECT_FLAG_STRICT | + DUK_HOBJECT_FLAG_NOTAIL | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION); + + /* Default prototype is a Duktape specific %NativeFunctionPrototype% + * which provides .length and .name getters. + */ + return duk__push_c_function_raw(thr, func, nargs, flags, DUK_BIDX_NATIVE_FUNCTION_PROTOTYPE); +} + +DUK_INTERNAL void duk_push_c_function_builtin(duk_hthread *thr, duk_c_function func, duk_int_t nargs) { + duk_uint_t flags; + + DUK_ASSERT_API_ENTRY(thr); + + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_CONSTRUCTABLE | + DUK_HOBJECT_FLAG_CALLABLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_NATFUNC | + DUK_HOBJECT_FLAG_NEWENV | + DUK_HOBJECT_FLAG_STRICT | + DUK_HOBJECT_FLAG_NOTAIL | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION); + + /* Must use Function.prototype for standard built-in functions. */ + (void) duk__push_c_function_raw(thr, func, nargs, flags, DUK_BIDX_FUNCTION_PROTOTYPE); +} + +DUK_INTERNAL void duk_push_c_function_builtin_noconstruct(duk_hthread *thr, duk_c_function func, duk_int_t nargs) { + duk_uint_t flags; + + DUK_ASSERT_API_ENTRY(thr); + + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_CALLABLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_NATFUNC | + DUK_HOBJECT_FLAG_NEWENV | + DUK_HOBJECT_FLAG_STRICT | + DUK_HOBJECT_FLAG_NOTAIL | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION); + + /* Must use Function.prototype for standard built-in functions. */ + (void) duk__push_c_function_raw(thr, func, nargs, flags, DUK_BIDX_FUNCTION_PROTOTYPE); +} + +DUK_EXTERNAL duk_idx_t duk_push_c_lightfunc(duk_hthread *thr, duk_c_function func, duk_idx_t nargs, duk_idx_t length, duk_int_t magic) { + duk_small_uint_t lf_flags; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + + DUK__CHECK_SPACE(); + + if (nargs >= DUK_LFUNC_NARGS_MIN && nargs <= DUK_LFUNC_NARGS_MAX) { + /* as is */ + } else if (nargs == DUK_VARARGS) { + nargs = DUK_LFUNC_NARGS_VARARGS; + } else { + goto api_error; + } + if (DUK_UNLIKELY(!(length >= DUK_LFUNC_LENGTH_MIN && length <= DUK_LFUNC_LENGTH_MAX))) { + goto api_error; + } + if (DUK_UNLIKELY(!(magic >= DUK_LFUNC_MAGIC_MIN && magic <= DUK_LFUNC_MAGIC_MAX))) { + goto api_error; + } + + lf_flags = DUK_LFUNC_FLAGS_PACK((duk_small_int_t) magic, (duk_small_uint_t) length, (duk_small_uint_t) nargs); + tv_slot = thr->valstack_top++; + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv_slot)); + DUK_TVAL_SET_LIGHTFUNC(tv_slot, func, lf_flags); + DUK_ASSERT(tv_slot >= thr->valstack_bottom); + return (duk_idx_t) (tv_slot - thr->valstack_bottom); + + api_error: + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); +} + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_hbufobj *duk_push_bufobj_raw(duk_hthread *thr, duk_uint_t hobject_flags_and_class, duk_small_int_t prototype_bidx) { + duk_hbufobj *obj; + duk_tval *tv_slot; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(prototype_bidx >= 0); + + DUK__CHECK_SPACE(); + + obj = duk_hbufobj_alloc(thr, hobject_flags_and_class); + DUK_ASSERT(obj != NULL); + + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) obj, thr->builtins[prototype_bidx]); + DUK_ASSERT_HBUFOBJ_VALID(obj); + + tv_slot = thr->valstack_top; + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) obj); + DUK_HOBJECT_INCREF(thr, obj); + thr->valstack_top++; + + return obj; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* XXX: There's quite a bit of overlap with buffer creation handling in + * duk_bi_buffer.c. Look for overlap and refactor. + */ +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#define DUK__PACK_ARGS(classnum,protobidx,elemtype,elemshift,istypedarray) \ + (((classnum) << 24) | ((protobidx) << 16) | ((elemtype) << 8) | ((elemshift) << 4) | (istypedarray)) + +static const duk_uint32_t duk__bufobj_flags_lookup[] = { + /* Node.js Buffers are Uint8Array instances which inherit from Buffer.prototype. */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_ARRAYBUFFER, DUK_BIDX_ARRAYBUFFER_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT8, 0, 0), /* DUK_BUFOBJ_ARRAYBUFFER */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_UINT8ARRAY, DUK_BIDX_NODEJS_BUFFER_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT8, 0, 1), /* DUK_BUFOBJ_NODEJS_BUFFER */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_DATAVIEW, DUK_BIDX_DATAVIEW_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT8, 0, 0), /* DUK_BUFOBJ_DATAVIEW */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_INT8ARRAY, DUK_BIDX_INT8ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_INT8, 0, 1), /* DUK_BUFOBJ_INT8ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_UINT8ARRAY, DUK_BIDX_UINT8ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT8, 0, 1), /* DUK_BUFOBJ_UINT8ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_UINT8CLAMPEDARRAY, DUK_BIDX_UINT8CLAMPEDARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT8CLAMPED, 0, 1), /* DUK_BUFOBJ_UINT8CLAMPEDARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_INT16ARRAY, DUK_BIDX_INT16ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_INT16, 1, 1), /* DUK_BUFOBJ_INT16ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_UINT16ARRAY, DUK_BIDX_UINT16ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT16, 1, 1), /* DUK_BUFOBJ_UINT16ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_INT32ARRAY, DUK_BIDX_INT32ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_INT32, 2, 1), /* DUK_BUFOBJ_INT32ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_UINT32ARRAY, DUK_BIDX_UINT32ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_UINT32, 2, 1), /* DUK_BUFOBJ_UINT32ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_FLOAT32ARRAY, DUK_BIDX_FLOAT32ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_FLOAT32, 2, 1), /* DUK_BUFOBJ_FLOAT32ARRAY */ + DUK__PACK_ARGS(DUK_HOBJECT_CLASS_FLOAT64ARRAY, DUK_BIDX_FLOAT64ARRAY_PROTOTYPE, DUK_HBUFOBJ_ELEM_FLOAT64, 3, 1) /* DUK_BUFOBJ_FLOAT64ARRAY */ +}; +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_EXTERNAL void duk_push_buffer_object(duk_hthread *thr, duk_idx_t idx_buffer, duk_size_t byte_offset, duk_size_t byte_length, duk_uint_t flags) { + duk_hbufobj *h_bufobj; + duk_hbuffer *h_val; + duk_hobject *h_arraybuf; + duk_uint32_t tmp; + duk_uint_t classnum; + duk_uint_t protobidx; + duk_uint_t lookupidx; + duk_uint_t uint_offset, uint_length, uint_added; + + DUK_ASSERT_API_ENTRY(thr); + + /* The underlying types for offset/length in duk_hbufobj is + * duk_uint_t; make sure argument values fit. + */ + uint_offset = (duk_uint_t) byte_offset; + uint_length = (duk_uint_t) byte_length; + if (sizeof(duk_size_t) != sizeof(duk_uint_t)) { + if (DUK_UNLIKELY((duk_size_t) uint_offset != byte_offset || (duk_size_t) uint_length != byte_length)) { + goto range_error; + } + } + + DUK_ASSERT_DISABLE(flags >= 0); /* flags is unsigned */ + lookupidx = flags; + if (DUK_UNLIKELY(lookupidx >= sizeof(duk__bufobj_flags_lookup) / sizeof(duk_uint32_t))) { + goto arg_error; + } + tmp = duk__bufobj_flags_lookup[lookupidx]; + classnum = tmp >> 24; + protobidx = (tmp >> 16) & 0xff; + + h_arraybuf = duk_get_hobject(thr, idx_buffer); + if (h_arraybuf != NULL && /* argument is an object */ + flags != DUK_BUFOBJ_ARRAYBUFFER && /* creating a view */ + DUK_HOBJECT_GET_CLASS_NUMBER(h_arraybuf) == DUK_HOBJECT_CLASS_ARRAYBUFFER /* argument is ArrayBuffer */) { + duk_uint_t tmp_offset; + + DUK_ASSERT_HBUFOBJ_VALID((duk_hbufobj *) h_arraybuf); + h_val = ((duk_hbufobj *) h_arraybuf)->buf; + if (DUK_UNLIKELY(h_val == NULL)) { + goto arg_error; + } + + tmp_offset = uint_offset + ((duk_hbufobj *) h_arraybuf)->offset; + if (DUK_UNLIKELY(tmp_offset < uint_offset)) { + goto range_error; + } + uint_offset = tmp_offset; + + /* Note intentional difference to new TypedArray(): we allow + * caller to create an uncovered typed array (which is memory + * safe); new TypedArray() rejects it. + */ + } else { + /* Handle unexpected object arguments here too, for nice error + * messages. + */ + h_arraybuf = NULL; + h_val = duk_require_hbuffer(thr, idx_buffer); + } + + /* Wrap check for offset+length. */ + uint_added = uint_offset + uint_length; + if (DUK_UNLIKELY(uint_added < uint_offset)) { + goto range_error; + } + DUK_ASSERT(uint_added >= uint_offset && uint_added >= uint_length); + + DUK_ASSERT(h_val != NULL); + + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(classnum), + (duk_small_int_t) protobidx); + DUK_ASSERT(h_bufobj != NULL); + + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + h_bufobj->buf_prop = h_arraybuf; + DUK_HOBJECT_INCREF_ALLOWNULL(thr, h_arraybuf); + h_bufobj->offset = uint_offset; + h_bufobj->length = uint_length; + h_bufobj->shift = (tmp >> 4) & 0x0f; + h_bufobj->elem_type = (tmp >> 8) & 0xff; + h_bufobj->is_typedarray = tmp & 0x0f; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + /* TypedArray views need an automatic ArrayBuffer which must be + * provided as .buffer property of the view. The ArrayBuffer is + * referenced via duk_hbufobj->buf_prop and an inherited .buffer + * accessor returns it. The ArrayBuffer is created lazily on first + * access if necessary so we don't need to do anything more here. + */ + return; + + range_error: + DUK_ERROR_RANGE(thr, DUK_STR_INVALID_ARGS); + DUK_WO_NORETURN(return;); + + arg_error: + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_ARGS); + DUK_WO_NORETURN(return;); +} +#else /* DUK_USE_BUFFEROBJECT_SUPPORT */ +DUK_EXTERNAL void duk_push_buffer_object(duk_hthread *thr, duk_idx_t idx_buffer, duk_size_t byte_offset, duk_size_t byte_length, duk_uint_t flags) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(idx_buffer); + DUK_UNREF(byte_offset); + DUK_UNREF(byte_length); + DUK_UNREF(flags); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +DUK_EXTERNAL duk_idx_t duk_push_error_object_va_raw(duk_hthread *thr, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, va_list ap) { + duk_hobject *proto; +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) + duk_small_uint_t augment_flags; +#endif + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr != NULL); + DUK_UNREF(filename); + DUK_UNREF(line); + + /* Error code also packs a tracedata related flag. */ +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) + augment_flags = 0; + if (err_code & DUK_ERRCODE_FLAG_NOBLAME_FILELINE) { + augment_flags = DUK_AUGMENT_FLAG_NOBLAME_FILELINE; + } +#endif + err_code = err_code & (~DUK_ERRCODE_FLAG_NOBLAME_FILELINE); + + /* error gets its 'name' from the prototype */ + proto = duk_error_prototype_from_code(thr, err_code); + (void) duk_push_object_helper_proto(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ERROR), + proto); + + /* ... and its 'message' from an instance property */ + if (fmt) { + duk_push_vsprintf(thr, fmt, ap); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_MESSAGE, DUK_PROPDESC_FLAGS_WC); + } else { + /* If no explicit message given, put error code into message field + * (as a number). This is not fully in keeping with the ECMAScript + * error model because messages are supposed to be strings (Error + * constructors use ToString() on their argument). However, it's + * probably more useful than having a separate 'code' property. + */ + duk_push_int(thr, err_code); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_MESSAGE, DUK_PROPDESC_FLAGS_WC); + } + + /* XXX: .code = err_code disabled, not sure if useful */ + + /* Creation time error augmentation */ +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) + /* filename may be NULL in which case file/line is not recorded */ + duk_err_augment_error_create(thr, thr, filename, line, augment_flags); /* may throw an error */ +#endif + + return duk_get_top_index_unsafe(thr); +} + +DUK_EXTERNAL duk_idx_t duk_push_error_object_raw(duk_hthread *thr, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, ...) { + va_list ap; + duk_idx_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + va_start(ap, fmt); + ret = duk_push_error_object_va_raw(thr, err_code, filename, line, fmt, ap); + va_end(ap); + return ret; +} + +#if !defined(DUK_USE_VARIADIC_MACROS) +DUK_EXTERNAL duk_idx_t duk_push_error_object_stash(duk_hthread *thr, duk_errcode_t err_code, const char *fmt, ...) { + const char *filename = duk_api_global_filename; + duk_int_t line = duk_api_global_line; + va_list ap; + duk_idx_t ret; + + DUK_ASSERT_API_ENTRY(thr); + + duk_api_global_filename = NULL; + duk_api_global_line = 0; + va_start(ap, fmt); + ret = duk_push_error_object_va_raw(thr, err_code, filename, line, fmt, ap); + va_end(ap); + return ret; +} +#endif /* DUK_USE_VARIADIC_MACROS */ + +DUK_EXTERNAL void *duk_push_buffer_raw(duk_hthread *thr, duk_size_t size, duk_small_uint_t flags) { + duk_tval *tv_slot; + duk_hbuffer *h; + void *buf_data; + + DUK_ASSERT_API_ENTRY(thr); + + DUK__CHECK_SPACE(); + + /* Check for maximum buffer length. */ + if (DUK_UNLIKELY(size > DUK_HBUFFER_MAX_BYTELEN)) { + DUK_ERROR_RANGE(thr, DUK_STR_BUFFER_TOO_LONG); + DUK_WO_NORETURN(return NULL;); + } + + h = duk_hbuffer_alloc(thr->heap, size, flags, &buf_data); + if (DUK_UNLIKELY(h == NULL)) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); + } + + tv_slot = thr->valstack_top; + DUK_TVAL_SET_BUFFER(tv_slot, h); + DUK_HBUFFER_INCREF(thr, h); + thr->valstack_top++; + + return (void *) buf_data; +} + +DUK_INTERNAL void *duk_push_fixed_buffer_nozero(duk_hthread *thr, duk_size_t len) { + DUK_ASSERT_API_ENTRY(thr); + return duk_push_buffer_raw(thr, len, DUK_BUF_FLAG_NOZERO); +} + +DUK_INTERNAL void *duk_push_fixed_buffer_zero(duk_hthread *thr, duk_size_t len) { + void *ptr; + + DUK_ASSERT_API_ENTRY(thr); + + ptr = duk_push_buffer_raw(thr, len, 0); + DUK_ASSERT(ptr != NULL); +#if !defined(DUK_USE_ZERO_BUFFER_DATA) + /* ES2015 requires zeroing even when DUK_USE_ZERO_BUFFER_DATA + * is not set. + */ + duk_memzero((void *) ptr, (size_t) len); +#endif + return ptr; +} + +#if defined(DUK_USE_ES6_PROXY) +DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr, duk_uint_t proxy_flags) { + duk_hobject *h_target; + duk_hobject *h_handler; + duk_hproxy *h_proxy; + duk_tval *tv_slot; + duk_uint_t flags; + + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(proxy_flags); + + /* DUK__CHECK_SPACE() unnecessary because the Proxy is written to + * value stack in-place. + */ +#if 0 + DUK__CHECK_SPACE(); +#endif + + /* Reject a proxy object as the target because it would need + * special handling in property lookups. (ES2015 has no such + * restriction.) + */ + h_target = duk_require_hobject_promote_mask(thr, -2, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + DUK_ASSERT(h_target != NULL); + if (DUK_HOBJECT_IS_PROXY(h_target)) { + goto fail_args; + } + + /* Reject a proxy object as the handler because it would cause + * potentially unbounded recursion. (ES2015 has no such + * restriction.) + * + * There's little practical reason to use a lightfunc or a plain + * buffer as the handler table: one could only provide traps via + * their prototype objects (Function.prototype and ArrayBuffer.prototype). + * Even so, as lightfuncs and plain buffers mimic their object + * counterparts, they're promoted and accepted here. + */ + h_handler = duk_require_hobject_promote_mask(thr, -1, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + DUK_ASSERT(h_handler != NULL); + if (DUK_HOBJECT_IS_PROXY(h_handler)) { + goto fail_args; + } + + /* XXX: Proxy object currently has no prototype, so ToPrimitive() + * coercion fails which is a bit confusing. + */ + + /* CALLABLE and CONSTRUCTABLE flags are copied from the (initial) + * target, see ES2015 Sections 9.5.15 and 9.5.13. + */ + flags = DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) h_target) & + (DUK_HOBJECT_FLAG_CALLABLE | DUK_HOBJECT_FLAG_CONSTRUCTABLE); + flags |= DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ; + if (flags & DUK_HOBJECT_FLAG_CALLABLE) { + flags |= DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_FUNCTION) | + DUK_HOBJECT_FLAG_SPECIAL_CALL; + } else { + flags |= DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT); + } + + h_proxy = duk_hproxy_alloc(thr, flags); + DUK_ASSERT(h_proxy != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_proxy) == NULL); + + /* Initialize Proxy target and handler references; avoid INCREF + * by stealing the value stack refcounts via direct value stack + * manipulation. INCREF is needed for the Proxy itself however. + */ + DUK_ASSERT(h_target != NULL); + h_proxy->target = h_target; + DUK_ASSERT(h_handler != NULL); + h_proxy->handler = h_handler; + DUK_ASSERT_HPROXY_VALID(h_proxy); + + DUK_ASSERT(duk_get_hobject(thr, -2) == h_target); + DUK_ASSERT(duk_get_hobject(thr, -1) == h_handler); + tv_slot = thr->valstack_top - 2; + DUK_ASSERT(tv_slot >= thr->valstack_bottom); + DUK_TVAL_SET_OBJECT(tv_slot, (duk_hobject *) h_proxy); + DUK_HOBJECT_INCREF(thr, (duk_hobject *) h_proxy); + tv_slot++; + DUK_TVAL_SET_UNDEFINED(tv_slot); /* [ ... target handler ] -> [ ... proxy undefined ] */ + thr->valstack_top = tv_slot; /* -> [ ... proxy ] */ + + DUK_DD(DUK_DDPRINT("created Proxy: %!iT", duk_get_tval(thr, -1))); + + return (duk_idx_t) (thr->valstack_top - thr->valstack_bottom - 1); + + fail_args: + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); +} +#else /* DUK_USE_ES6_PROXY */ +DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr, duk_uint_t proxy_flags) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(proxy_flags); + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return 0;); +} +#endif /* DUK_USE_ES6_PROXY */ + +#if defined(DUK_USE_ASSERTIONS) +DUK_LOCAL void duk__validate_push_heapptr(duk_hthread *thr, void *ptr) { + duk_heaphdr *h; + duk_heaphdr *curr; + duk_bool_t found = 0; + + h = (duk_heaphdr *) ptr; + if (h == NULL) { + /* Allowed. */ + return; + } + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(h)); + + /* One particular problem case is where an object has been + * queued for finalization but the finalizer hasn't yet been + * executed. + * + * Corner case: we're running in a finalizer for object X, and + * user code calls duk_push_heapptr() for X itself. In this + * case X will be in finalize_list, and we can detect the case + * by seeing that X's FINALIZED flag is set (which is done before + * the finalizer starts executing). + */ +#if defined(DUK_USE_FINALIZER_SUPPORT) + for (curr = thr->heap->finalize_list; + curr != NULL; + curr = DUK_HEAPHDR_GET_NEXT(thr->heap, curr)) { + /* FINALIZABLE is set for all objects on finalize_list + * except for an object being finalized right now. So + * can't assert here. + */ +#if 0 + DUK_ASSERT(DUK_HEAPHDR_HAS_FINALIZABLE(curr)); +#endif + + if (curr == h) { + if (DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) h)) { + /* Object is currently being finalized. */ + DUK_ASSERT(found == 0); /* Would indicate corrupted lists. */ + found = 1; + } else { + /* Not being finalized but on finalize_list, + * allowed since Duktape 2.1. + */ + DUK_ASSERT(found == 0); /* Would indicate corrupted lists. */ + found = 1; + } + } + } +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Because refzero_list is now processed to completion inline with + * no side effects, it's always empty here. + */ + DUK_ASSERT(thr->heap->refzero_list == NULL); +#endif + + /* If not present in finalize_list (or refzero_list), it + * must be either in heap_allocated or the string table. + */ + if (DUK_HEAPHDR_IS_STRING(h)) { + duk_uint32_t i; + duk_hstring *str; + duk_heap *heap = thr->heap; + + DUK_ASSERT(found == 0); + for (i = 0; i < heap->st_size; i++) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + str = DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, heap->strtable16[i]); +#else + str = heap->strtable[i]; +#endif + while (str != NULL) { + if (str == (duk_hstring *) h) { + DUK_ASSERT(found == 0); /* Would indicate corrupted lists. */ + found = 1; + break; + } + str = str->hdr.h_next; + } + } + DUK_ASSERT(found != 0); + } else { + for (curr = thr->heap->heap_allocated; + curr != NULL; + curr = DUK_HEAPHDR_GET_NEXT(thr->heap, curr)) { + if (curr == h) { + DUK_ASSERT(found == 0); /* Would indicate corrupted lists. */ + found = 1; + } + } + DUK_ASSERT(found != 0); + } +} +#endif /* DUK_USE_ASSERTIONS */ + +DUK_EXTERNAL duk_idx_t duk_push_heapptr(duk_hthread *thr, void *ptr) { + duk_idx_t ret; + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + /* Reviving an object using a heap pointer is a dangerous API + * operation: if the application doesn't guarantee that the + * pointer target is always reachable, difficult-to-diagnose + * problems may ensue. Try to validate the 'ptr' argument to + * the extent possible. + */ + +#if defined(DUK_USE_ASSERTIONS) + duk__validate_push_heapptr(thr, ptr); +#endif + + DUK__CHECK_SPACE(); + + ret = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + tv = thr->valstack_top++; + + if (ptr == NULL) { + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); + return ret; + } + + DUK_ASSERT_HEAPHDR_VALID((duk_heaphdr *) ptr); + + /* If the argument is on finalize_list it has technically been + * unreachable before duk_push_heapptr() but it's still safe to + * push it. Starting from Duktape 2.1 allow application code to + * do so. There are two main cases: + * + * (1) The object is on the finalize_list and we're called by + * the finalizer for the object being finalized. In this + * case do nothing: finalize_list handling will deal with + * the object queueing. This is detected by the object not + * having a FINALIZABLE flag despite being on the finalize_list; + * the flag is cleared for the object being finalized only. + * + * (2) The object is on the finalize_list but is not currently + * being processed. In this case the object can be queued + * back to heap_allocated with a few flags cleared, in effect + * cancelling the finalizer. + */ + if (DUK_UNLIKELY(DUK_HEAPHDR_HAS_FINALIZABLE((duk_heaphdr *) ptr))) { + duk_heaphdr *curr; + + DUK_D(DUK_DPRINT("duk_push_heapptr() with a pointer on finalize_list, autorescue")); + + curr = (duk_heaphdr *) ptr; + DUK_HEAPHDR_CLEAR_FINALIZABLE(curr); + + /* Because FINALIZED is set prior to finalizer call, it will + * be set for the object being currently finalized, but not + * for other objects on finalize_list. + */ + DUK_HEAPHDR_CLEAR_FINALIZED(curr); + + /* Dequeue object from finalize_list and queue it back to + * heap_allocated. + */ +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(curr) >= 1); /* Preincremented on finalize_list insert. */ + DUK_HEAPHDR_PREDEC_REFCOUNT(curr); +#endif + DUK_HEAP_REMOVE_FROM_FINALIZE_LIST(thr->heap, curr); + DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(thr->heap, curr); + + /* Continue with the rest. */ + } + + switch (DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) ptr)) { + case DUK_HTYPE_STRING: + DUK_TVAL_SET_STRING(tv, (duk_hstring *) ptr); + break; + case DUK_HTYPE_OBJECT: + DUK_TVAL_SET_OBJECT(tv, (duk_hobject *) ptr); + break; + default: + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) ptr) == DUK_HTYPE_BUFFER); + DUK_TVAL_SET_BUFFER(tv, (duk_hbuffer *) ptr); + break; + } + + DUK_HEAPHDR_INCREF(thr, (duk_heaphdr *) ptr); + + return ret; +} + +/* Push object with no prototype, i.e. a "bare" object. */ +DUK_EXTERNAL duk_idx_t duk_push_bare_object(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), + -1); /* no prototype */ + return duk_get_top_index_unsafe(thr); +} + +DUK_INTERNAL void duk_push_hstring(duk_hthread *thr, duk_hstring *h) { + duk_tval tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(h != NULL); + + DUK_TVAL_SET_STRING(&tv, h); + duk_push_tval(thr, &tv); +} + +DUK_INTERNAL void duk_push_hstring_stridx(duk_hthread *thr, duk_small_uint_t stridx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT_STRIDX_VALID(stridx); + duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx)); +} + +DUK_INTERNAL void duk_push_hstring_empty(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, DUK_STRIDX_EMPTY_STRING)); +} + +DUK_INTERNAL void duk_push_hobject(duk_hthread *thr, duk_hobject *h) { + duk_tval tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(h != NULL); + + DUK_TVAL_SET_OBJECT(&tv, h); + duk_push_tval(thr, &tv); +} + +DUK_INTERNAL void duk_push_hbuffer(duk_hthread *thr, duk_hbuffer *h) { + duk_tval tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(h != NULL); + + DUK_TVAL_SET_BUFFER(&tv, h); + duk_push_tval(thr, &tv); +} + +DUK_INTERNAL void duk_push_hobject_bidx(duk_hthread *thr, duk_small_int_t builtin_idx) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(builtin_idx >= 0 && builtin_idx < DUK_NUM_BUILTINS); + DUK_ASSERT(thr->builtins[builtin_idx] != NULL); + + duk_push_hobject(thr, thr->builtins[builtin_idx]); +} + +/* + * Poppers + */ + +DUK_LOCAL DUK_ALWAYS_INLINE void duk__pop_n_unsafe_raw(duk_hthread *thr, duk_idx_t count) { + duk_tval *tv; +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_tval *tv_end; +#endif + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(count >= 0); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) count); + +#if defined(DUK_USE_REFERENCE_COUNTING) + tv = thr->valstack_top; + tv_end = tv - count; + while (tv != tv_end) { + tv--; + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, tv); + } + thr->valstack_top = tv; + DUK_REFZERO_CHECK_FAST(thr); +#else + tv = thr->valstack_top; + while (count > 0) { + count--; + tv--; + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_TVAL_SET_UNDEFINED(tv); + } + thr->valstack_top = tv; +#endif + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} + +DUK_EXTERNAL void duk_pop_n(duk_hthread *thr, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + + if (DUK_UNLIKELY((duk_uidx_t) (thr->valstack_top - thr->valstack_bottom) < (duk_uidx_t) count)) { + DUK_ERROR_RANGE_INVALID_COUNT(thr); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(count >= 0); + + duk__pop_n_unsafe_raw(thr, count); +} + +#if defined(DUK_USE_PREFER_SIZE) +DUK_INTERNAL void duk_pop_n_unsafe(duk_hthread *thr, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n(thr, count); +} +#else /* DUK_USE_PREFER_SIZE */ +DUK_INTERNAL void duk_pop_n_unsafe(duk_hthread *thr, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + duk__pop_n_unsafe_raw(thr, count); +} +#endif /* DUK_USE_PREFER_SIZE */ + +/* Pop N elements without DECREF (in effect "stealing" any actual refcounts). */ +#if defined(DUK_USE_REFERENCE_COUNTING) +DUK_INTERNAL void duk_pop_n_nodecref_unsafe(duk_hthread *thr, duk_idx_t count) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(count >= 0); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) count); + + tv = thr->valstack_top; + while (count > 0) { + count--; + tv--; + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_TVAL_SET_UNDEFINED(tv); + } + thr->valstack_top = tv; + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} +#else /* DUK_USE_REFERENCE_COUNTING */ +DUK_INTERNAL void duk_pop_n_nodecref_unsafe(duk_hthread *thr, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_unsafe(thr, count); +} +#endif /* DUK_USE_REFERENCE_COUNTING */ + +/* Popping one element is called so often that when footprint is not an issue, + * compile a specialized function for it. + */ +#if defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL void duk_pop(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n(thr, 1); +} +DUK_INTERNAL void duk_pop_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_unsafe(thr, 1); +} +DUK_INTERNAL void duk_pop_nodecref_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_nodecref_unsafe(thr, 1); +} +#else /* DUK_USE_PREFER_SIZE */ +DUK_LOCAL DUK_ALWAYS_INLINE void duk__pop_unsafe_raw(duk_hthread *thr) { + duk_tval *tv; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(thr->valstack_top != thr->valstack_bottom); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) 1); + + tv = --thr->valstack_top; + DUK_ASSERT(tv >= thr->valstack_bottom); +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv); /* side effects */ +#else + DUK_TVAL_SET_UNDEFINED(tv); +#endif + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} +DUK_EXTERNAL void duk_pop(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + if (DUK_UNLIKELY(thr->valstack_top == thr->valstack_bottom)) { + DUK_ERROR_RANGE_INVALID_COUNT(thr); + DUK_WO_NORETURN(return;); + } + + duk__pop_unsafe_raw(thr); +} +DUK_INTERNAL void duk_pop_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk__pop_unsafe_raw(thr); +} +DUK_INTERNAL void duk_pop_nodecref_unsafe(duk_hthread *thr) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->valstack_top != thr->valstack_bottom); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) 1); + + tv = --thr->valstack_top; + DUK_ASSERT(tv >= thr->valstack_bottom); + DUK_TVAL_SET_UNDEFINED(tv); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} +#endif /* !DUK_USE_PREFER_SIZE */ + +#if defined(DUK_USE_PREFER_SIZE) +DUK_INTERNAL void duk_pop_undefined(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_nodecref_unsafe(thr); +} +#else /* DUK_USE_PREFER_SIZE */ +DUK_INTERNAL void duk_pop_undefined(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->valstack_top != thr->valstack_bottom); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) 1); + + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top - 1)); + thr->valstack_top--; + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} +#endif /* !DUK_USE_PREFER_SIZE */ + +#if defined(DUK_USE_PREFER_SIZE) +DUK_EXTERNAL void duk_pop_2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n(thr, 2); +} +DUK_INTERNAL void duk_pop_2_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_unsafe(thr, 2); +} +DUK_INTERNAL void duk_pop_2_nodecref_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_nodecref_unsafe(thr, 2); +} +#else +DUK_LOCAL DUK_ALWAYS_INLINE void duk__pop_2_unsafe_raw(duk_hthread *thr) { + duk_tval *tv; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(thr->valstack_top != thr->valstack_bottom); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) 2); + + tv = --thr->valstack_top; + DUK_ASSERT(tv >= thr->valstack_bottom); +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv); /* side effects */ +#else + DUK_TVAL_SET_UNDEFINED(tv); +#endif + tv = --thr->valstack_top; + DUK_ASSERT(tv >= thr->valstack_bottom); +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv); /* side effects */ +#else + DUK_TVAL_SET_UNDEFINED(tv); +#endif + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} +DUK_EXTERNAL void duk_pop_2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + if (DUK_UNLIKELY(thr->valstack_top - 2 < thr->valstack_bottom)) { + DUK_ERROR_RANGE_INVALID_COUNT(thr); + DUK_WO_NORETURN(return;); + } + + duk__pop_2_unsafe_raw(thr); +} +DUK_INTERNAL void duk_pop_2_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk__pop_2_unsafe_raw(thr); +} +DUK_INTERNAL void duk_pop_2_nodecref_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->valstack_top != thr->valstack_bottom); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) >= (duk_size_t) 2); + + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top - 1)); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top - 2)); + thr->valstack_top -= 2; + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); +} +#endif /* !DUK_USE_PREFER_SIZE */ + +DUK_EXTERNAL void duk_pop_3(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n(thr, 3); +} + +DUK_INTERNAL void duk_pop_3_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_unsafe(thr, 3); +} + +DUK_INTERNAL void duk_pop_3_nodecref_unsafe(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_pop_n_nodecref_unsafe(thr, 3); +} + +/* + * Pack and unpack (pack value stack entries into an array and vice versa) + */ + +/* XXX: pack index range? array index offset? */ +DUK_INTERNAL void duk_pack(duk_hthread *thr, duk_idx_t count) { + duk_tval *tv_src; + duk_tval *tv_dst; + duk_tval *tv_curr; + duk_tval *tv_limit; + duk_idx_t top; + + DUK_ASSERT_API_ENTRY(thr); + + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + top = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + DUK_ASSERT(top >= 0); + if (DUK_UNLIKELY((duk_uidx_t) count > (duk_uidx_t) top)) { + /* Also handles negative count. */ + DUK_ERROR_RANGE_INVALID_COUNT(thr); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(count >= 0); + + /* Wrapping is controlled by the check above: value stack top can be + * at most DUK_USE_VALSTACK_LIMIT which is low enough so that + * multiplying with sizeof(duk_tval) won't wrap. + */ + DUK_ASSERT(count >= 0 && count <= (duk_idx_t) DUK_USE_VALSTACK_LIMIT); + DUK_ASSERT((duk_size_t) count <= DUK_SIZE_MAX / sizeof(duk_tval)); /* no wrapping */ + + tv_dst = duk_push_harray_with_size_outptr(thr, (duk_uint32_t) count); /* XXX: uninitialized would be OK */ + DUK_ASSERT(count == 0 || tv_dst != NULL); + + /* Copy value stack values directly to the array part without + * any refcount updates: net refcount changes are zero. + */ + tv_src = thr->valstack_top - count - 1; + duk_memcpy_unsafe((void *) tv_dst, (const void *) tv_src, (size_t) count * sizeof(duk_tval)); + + /* Overwrite result array to final value stack location and wipe + * the rest; no refcount operations needed. + */ + + tv_dst = tv_src; /* when count == 0, same as tv_src (OK) */ + tv_src = thr->valstack_top - 1; + DUK_TVAL_SET_TVAL(tv_dst, tv_src); + + /* XXX: internal helper to wipe a value stack segment? */ + tv_curr = tv_dst + 1; + tv_limit = thr->valstack_top; + while (tv_curr != tv_limit) { + /* Wipe policy: keep as 'undefined'. */ + DUK_TVAL_SET_UNDEFINED(tv_curr); + tv_curr++; + } + thr->valstack_top = tv_dst + 1; +} + +DUK_INTERNAL duk_idx_t duk_unpack_array_like(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + + tv = duk_require_tval(thr, idx); + if (DUK_LIKELY(DUK_TVAL_IS_OBJECT(tv))) { + duk_hobject *h; + duk_uint32_t len; + duk_uint32_t i; + + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + DUK_UNREF(h); + +#if defined(DUK_USE_ARRAY_FASTPATH) /* close enough */ + if (DUK_LIKELY(DUK_HOBJECT_IS_ARRAY(h) && + ((duk_harray *) h)->length <= DUK_HOBJECT_GET_ASIZE(h))) { + duk_harray *h_arr; + duk_tval *tv_src; + duk_tval *tv_dst; + + h_arr = (duk_harray *) h; + len = h_arr->length; + if (DUK_UNLIKELY(len >= 0x80000000UL)) { + goto fail_over_2g; + } + duk_require_stack(thr, (duk_idx_t) len); + + /* The potential allocation in duk_require_stack() may + * run a finalizer which modifies the argArray so that + * e.g. becomes sparse. So, we need to recheck that the + * array didn't change size and that there's still a + * valid backing array part. + * + * XXX: alternatively, could prevent finalizers for the + * duration. + */ + if (DUK_UNLIKELY(len != h_arr->length || + h_arr->length > DUK_HOBJECT_GET_ASIZE((duk_hobject *) h_arr))) { + goto skip_fast; + } + + /* Main fast path: arguments array is almost always + * an actual array (though it might also be an arguments + * object). + */ + + DUK_DDD(DUK_DDDPRINT("fast path for %ld elements", (long) h_arr->length)); + tv_src = DUK_HOBJECT_A_GET_BASE(thr->heap, h); + tv_dst = thr->valstack_top; + while (len-- > 0) { + DUK_ASSERT(tv_dst < thr->valstack_end); + if (DUK_UNLIKELY(DUK_TVAL_IS_UNUSED(tv_src))) { + /* Gaps are very unlikely. Skip over them, + * without an ancestor lookup (technically + * not compliant). + */ + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv_dst)); /* valstack policy */ + } else { + DUK_TVAL_SET_TVAL(tv_dst, tv_src); + DUK_TVAL_INCREF(thr, tv_dst); + } + tv_src++; + tv_dst++; + } + DUK_ASSERT(tv_dst <= thr->valstack_end); + thr->valstack_top = tv_dst; + return (duk_idx_t) h_arr->length; + } + skip_fast: +#endif /* DUK_USE_ARRAY_FASTPATH */ + + /* Slow path: actual lookups. The initial 'length' lookup + * decides the output length, regardless of side effects that + * may resize or change the argArray while we read the + * indices. + */ + idx = duk_normalize_index(thr, idx); + duk_get_prop_stridx(thr, idx, DUK_STRIDX_LENGTH); + len = duk_to_uint32(thr, -1); /* ToUint32() coercion required */ + if (DUK_UNLIKELY(len >= 0x80000000UL)) { + goto fail_over_2g; + } + duk_pop_unsafe(thr); + DUK_DDD(DUK_DDDPRINT("slow path for %ld elements", (long) len)); + + duk_require_stack(thr, (duk_idx_t) len); + for (i = 0; i < len; i++) { + duk_get_prop_index(thr, idx, (duk_uarridx_t) i); + } + return (duk_idx_t) len; + } else if (DUK_TVAL_IS_UNDEFINED(tv) || DUK_TVAL_IS_NULL(tv)) { + return 0; + } + + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); + + fail_over_2g: + DUK_ERROR_RANGE_INVALID_LENGTH(thr); + DUK_WO_NORETURN(return 0;); +} + +/* + * Error throwing + */ + +DUK_EXTERNAL void duk_throw_raw(duk_hthread *thr) { + duk_tval *tv_val; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr->valstack_bottom >= thr->valstack); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_top); + + if (DUK_UNLIKELY(thr->valstack_top == thr->valstack_bottom)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return;); + } + + /* Errors are augmented when they are created, not when they are + * thrown or re-thrown. The current error handler, however, runs + * just before an error is thrown. + */ + + /* Sync so that augmentation sees up-to-date activations, NULL + * thr->ptr_curr_pc so that it's not used if side effects occur + * in augmentation or longjmp handling. + */ + duk_hthread_sync_and_null_currpc(thr); + +#if defined(DUK_USE_AUGMENT_ERROR_THROW) + DUK_DDD(DUK_DDDPRINT("THROW ERROR (API): %!dT (before throw augment)", (duk_tval *) duk_get_tval(thr, -1))); + duk_err_augment_error_throw(thr); +#endif + DUK_DDD(DUK_DDDPRINT("THROW ERROR (API): %!dT (after throw augment)", (duk_tval *) duk_get_tval(thr, -1))); + + tv_val = DUK_GET_TVAL_NEGIDX(thr, -1); + duk_err_setup_ljstate1(thr, DUK_LJ_TYPE_THROW, tv_val); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_err_check_debugger_integration(thr); +#endif + + /* thr->heap->lj.jmpbuf_ptr is checked by duk_err_longjmp() so we don't + * need to check that here. If the value is NULL, a fatal error occurs + * because we can't return. + */ + + duk_err_longjmp(thr); + DUK_UNREACHABLE(); +} + +DUK_EXTERNAL void duk_fatal_raw(duk_hthread *thr, const char *err_msg) { + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(thr->heap->fatal_func != NULL); + + DUK_D(DUK_DPRINT("fatal error occurred: %s", err_msg ? err_msg : "NULL")); + + /* fatal_func should be noreturn, but noreturn declarations on function + * pointers has a very spotty support apparently so it's not currently + * done. + */ + thr->heap->fatal_func(thr->heap->heap_udata, err_msg); + + /* If the fatal handler returns, all bets are off. It'd be nice to + * print something here but since we don't want to depend on stdio, + * there's no way to do so portably. + */ + DUK_D(DUK_DPRINT("fatal error handler returned, all bets are off!")); + for (;;) { + /* loop forever, don't return (function marked noreturn) */ + } +} + +DUK_EXTERNAL void duk_error_va_raw(duk_hthread *thr, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, va_list ap) { + DUK_ASSERT_API_ENTRY(thr); + + duk_push_error_object_va_raw(thr, err_code, filename, line, fmt, ap); + (void) duk_throw(thr); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_error_raw(duk_hthread *thr, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, ...) { + va_list ap; + + DUK_ASSERT_API_ENTRY(thr); + + va_start(ap, fmt); + duk_push_error_object_va_raw(thr, err_code, filename, line, fmt, ap); + va_end(ap); + (void) duk_throw(thr); + DUK_WO_NORETURN(return;); +} + +#if !defined(DUK_USE_VARIADIC_MACROS) +DUK_NORETURN(DUK_LOCAL_DECL void duk__throw_error_from_stash(duk_hthread *thr, duk_errcode_t err_code, const char *fmt, va_list ap)); + +DUK_LOCAL void duk__throw_error_from_stash(duk_hthread *thr, duk_errcode_t err_code, const char *fmt, va_list ap) { + const char *filename; + duk_int_t line; + + DUK_ASSERT_CTX_VALID(thr); + + filename = duk_api_global_filename; + line = duk_api_global_line; + duk_api_global_filename = NULL; + duk_api_global_line = 0; + + duk_push_error_object_va_raw(thr, err_code, filename, line, fmt, ap); + (void) duk_throw(thr); + DUK_WO_NORETURN(return;); +} + +#define DUK__ERROR_STASH_SHARED(code) do { \ + va_list ap; \ + va_start(ap, fmt); \ + duk__throw_error_from_stash(thr, (code), fmt, ap); \ + va_end(ap); \ + DUK_WO_NORETURN(return 0;); \ + } while (0) + +DUK_EXTERNAL duk_ret_t duk_error_stash(duk_hthread *thr, duk_errcode_t err_code, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(err_code); +} +DUK_EXTERNAL duk_ret_t duk_generic_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_ERROR); +} +DUK_EXTERNAL duk_ret_t duk_eval_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_EVAL_ERROR); +} +DUK_EXTERNAL duk_ret_t duk_range_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_RANGE_ERROR); +} +DUK_EXTERNAL duk_ret_t duk_reference_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_REFERENCE_ERROR); +} +DUK_EXTERNAL duk_ret_t duk_syntax_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_SYNTAX_ERROR); +} +DUK_EXTERNAL duk_ret_t duk_type_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_TYPE_ERROR); +} +DUK_EXTERNAL duk_ret_t duk_uri_error_stash(duk_hthread *thr, const char *fmt, ...) { + DUK_ASSERT_API_ENTRY(thr); + DUK__ERROR_STASH_SHARED(DUK_ERR_URI_ERROR); +} +#endif /* DUK_USE_VARIADIC_MACROS */ + +/* + * Comparison + */ + +DUK_EXTERNAL duk_bool_t duk_equals(duk_hthread *thr, duk_idx_t idx1, duk_idx_t idx2) { + duk_tval *tv1, *tv2; + + DUK_ASSERT_API_ENTRY(thr); + + tv1 = duk_get_tval(thr, idx1); + tv2 = duk_get_tval(thr, idx2); + if ((tv1 == NULL) || (tv2 == NULL)) { + return 0; + } + + /* Coercion may be needed, the helper handles that by pushing the + * tagged values to the stack. + */ + return duk_js_equals(thr, tv1, tv2); +} + +DUK_EXTERNAL duk_bool_t duk_strict_equals(duk_hthread *thr, duk_idx_t idx1, duk_idx_t idx2) { + duk_tval *tv1, *tv2; + + DUK_ASSERT_API_ENTRY(thr); + + tv1 = duk_get_tval(thr, idx1); + tv2 = duk_get_tval(thr, idx2); + if ((tv1 == NULL) || (tv2 == NULL)) { + return 0; + } + + /* No coercions or other side effects, so safe */ + return duk_js_strict_equals(tv1, tv2); +} + +DUK_EXTERNAL duk_bool_t duk_samevalue(duk_hthread *thr, duk_idx_t idx1, duk_idx_t idx2) { + duk_tval *tv1, *tv2; + + DUK_ASSERT_API_ENTRY(thr); + + tv1 = duk_get_tval(thr, idx1); + tv2 = duk_get_tval(thr, idx2); + if ((tv1 == NULL) || (tv2 == NULL)) { + return 0; + } + + /* No coercions or other side effects, so safe */ + return duk_js_samevalue(tv1, tv2); +} + +/* + * instanceof + */ + +DUK_EXTERNAL duk_bool_t duk_instanceof(duk_hthread *thr, duk_idx_t idx1, duk_idx_t idx2) { + duk_tval *tv1, *tv2; + + DUK_ASSERT_API_ENTRY(thr); + + /* Index validation is strict, which differs from duk_equals(). + * The strict behavior mimics how instanceof itself works, e.g. + * it is a TypeError if rval is not a -callable- object. It would + * be somewhat inconsistent if rval would be allowed to be + * non-existent without a TypeError. + */ + tv1 = duk_require_tval(thr, idx1); + DUK_ASSERT(tv1 != NULL); + tv2 = duk_require_tval(thr, idx2); + DUK_ASSERT(tv2 != NULL); + + return duk_js_instanceof(thr, tv1, tv2); +} + +/* + * Lightfunc + */ + +DUK_INTERNAL void duk_push_lightfunc_name_raw(duk_hthread *thr, duk_c_function func, duk_small_uint_t lf_flags) { + /* Lightfunc name, includes Duktape/C native function pointer, which + * can often be used to locate the function from a symbol table. + * The name also includes the 16-bit duk_tval flags field because it + * includes the magic value. Because a single native function often + * provides different functionality depending on the magic value, it + * seems reasonably to include it in the name. + * + * On the other hand, a complicated name increases string table + * pressure in low memory environments (but only when function name + * is accessed). + */ + + DUK_ASSERT_API_ENTRY(thr); + + duk_push_literal(thr, "light_"); + duk_push_string_funcptr(thr, (duk_uint8_t *) &func, sizeof(func)); + duk_push_sprintf(thr, "_%04x", (unsigned int) lf_flags); + duk_concat(thr, 3); +} + +DUK_INTERNAL void duk_push_lightfunc_name(duk_hthread *thr, duk_tval *tv) { + duk_c_function func; + duk_small_uint_t lf_flags; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv)); + + DUK_TVAL_GET_LIGHTFUNC(tv, func, lf_flags); + duk_push_lightfunc_name_raw(thr, func, lf_flags); +} + +DUK_INTERNAL void duk_push_lightfunc_tostring(duk_hthread *thr, duk_tval *tv) { + duk_c_function func; + duk_small_uint_t lf_flags; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv)); + + DUK_TVAL_GET_LIGHTFUNC(tv, func, lf_flags); /* read before 'tv' potentially invalidated */ + duk_push_literal(thr, "function "); + duk_push_lightfunc_name_raw(thr, func, lf_flags); + duk_push_literal(thr, "() { [lightfunc code] }"); + duk_concat(thr, 3); +} + +/* + * Function pointers + * + * Printing function pointers is non-portable, so we do that by hex printing + * bytes from memory. + */ + +DUK_INTERNAL void duk_push_string_funcptr(duk_hthread *thr, duk_uint8_t *ptr, duk_size_t sz) { + duk_uint8_t buf[32 * 2]; + duk_uint8_t *p, *q; + duk_small_uint_t i; + duk_small_uint_t t; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(sz <= 32); /* sanity limit for function pointer size */ + + p = buf; +#if defined(DUK_USE_INTEGER_LE) + q = ptr + sz; +#else + q = ptr; +#endif + for (i = 0; i < sz; i++) { +#if defined(DUK_USE_INTEGER_LE) + t = *(--q); +#else + t = *(q++); +#endif + *p++ = duk_lc_digits[t >> 4]; + *p++ = duk_lc_digits[t & 0x0f]; + } + + duk_push_lstring(thr, (const char *) buf, sz * 2); +} + +/* + * Push readable string summarizing duk_tval. The operation is side effect + * free and will only throw from internal errors (e.g. out of memory). + * This is used by e.g. property access code to summarize a key/base safely, + * and is not intended to be fast (but small and safe). + */ + +/* String limits for summary strings. */ +#define DUK__READABLE_SUMMARY_MAXCHARS 96 /* maximum supported by helper */ +#define DUK__READABLE_STRING_MAXCHARS 32 /* for strings/symbols */ +#define DUK__READABLE_ERRMSG_MAXCHARS 96 /* for error messages */ + +/* String sanitizer which escapes ASCII control characters and a few other + * ASCII characters, passes Unicode as is, and replaces invalid UTF-8 with + * question marks. No errors are thrown for any input string, except in out + * of memory situations. + */ +DUK_LOCAL void duk__push_hstring_readable_unicode(duk_hthread *thr, duk_hstring *h_input, duk_small_uint_t maxchars) { + const duk_uint8_t *p, *p_start, *p_end; + duk_uint8_t buf[DUK_UNICODE_MAX_XUTF8_LENGTH * DUK__READABLE_SUMMARY_MAXCHARS + + 2 /*quotes*/ + 3 /*periods*/]; + duk_uint8_t *q; + duk_ucodepoint_t cp; + duk_small_uint_t nchars; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(h_input != NULL); + DUK_ASSERT(maxchars <= DUK__READABLE_SUMMARY_MAXCHARS); + + p_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_input); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input); + p = p_start; + q = buf; + + nchars = 0; + *q++ = (duk_uint8_t) DUK_ASC_SINGLEQUOTE; + for (;;) { + if (p >= p_end) { + break; + } + if (nchars == maxchars) { + *q++ = (duk_uint8_t) DUK_ASC_PERIOD; + *q++ = (duk_uint8_t) DUK_ASC_PERIOD; + *q++ = (duk_uint8_t) DUK_ASC_PERIOD; + break; + } + if (duk_unicode_decode_xutf8(thr, &p, p_start, p_end, &cp)) { + if (cp < 0x20 || cp == 0x7f || cp == DUK_ASC_SINGLEQUOTE || cp == DUK_ASC_BACKSLASH) { + DUK_ASSERT(DUK_UNICODE_MAX_XUTF8_LENGTH >= 4); /* estimate is valid */ + DUK_ASSERT((cp >> 4) <= 0x0f); + *q++ = (duk_uint8_t) DUK_ASC_BACKSLASH; + *q++ = (duk_uint8_t) DUK_ASC_LC_X; + *q++ = (duk_uint8_t) duk_lc_digits[cp >> 4]; + *q++ = (duk_uint8_t) duk_lc_digits[cp & 0x0f]; + } else { + q += duk_unicode_encode_xutf8(cp, q); + } + } else { + p++; /* advance manually */ + *q++ = (duk_uint8_t) DUK_ASC_QUESTION; + } + nchars++; + } + *q++ = (duk_uint8_t) DUK_ASC_SINGLEQUOTE; + + duk_push_lstring(thr, (const char *) buf, (duk_size_t) (q - buf)); +} + +DUK_LOCAL const char *duk__push_string_tval_readable(duk_hthread *thr, duk_tval *tv, duk_bool_t error_aware) { + DUK_ASSERT_CTX_VALID(thr); + /* 'tv' may be NULL */ + + if (tv == NULL) { + duk_push_literal(thr, "none"); + } else { + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_STRING: { + duk_hstring *h = DUK_TVAL_GET_STRING(tv); + if (DUK_HSTRING_HAS_SYMBOL(h)) { + /* XXX: string summary produces question marks + * so this is not very ideal. + */ + duk_push_literal(thr, "[Symbol "); + duk_push_string(thr, duk__get_symbol_type_string(h)); + duk_push_literal(thr, " "); + duk__push_hstring_readable_unicode(thr, h, DUK__READABLE_STRING_MAXCHARS); + duk_push_literal(thr, "]"); + duk_concat(thr, 5); + break; + } + duk__push_hstring_readable_unicode(thr, h, DUK__READABLE_STRING_MAXCHARS); + break; + } + case DUK_TAG_OBJECT: { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + if (error_aware && + duk_hobject_prototype_chain_contains(thr, h, thr->builtins[DUK_BIDX_ERROR_PROTOTYPE], 1 /*ignore_loop*/)) { + /* Get error message in a side effect free way if + * possible; if not, summarize as a generic object. + * Error message currently gets quoted. + */ + /* XXX: better internal getprop call; get without side effects + * but traverse inheritance chain. + */ + duk_tval *tv_msg; + tv_msg = duk_hobject_find_existing_entry_tval_ptr(thr->heap, h, DUK_HTHREAD_STRING_MESSAGE(thr)); + if (tv_msg != NULL && DUK_TVAL_IS_STRING(tv_msg)) { + /* It's critical to avoid recursion so + * only summarize a string .message. + */ + duk__push_hstring_readable_unicode(thr, DUK_TVAL_GET_STRING(tv_msg), DUK__READABLE_ERRMSG_MAXCHARS); + break; + } + } + duk_push_class_string_tval(thr, tv, 1 /*avoid_side_effects*/); + break; + } + case DUK_TAG_BUFFER: { + /* While plain buffers mimic Uint8Arrays, they summarize differently. + * This is useful so that the summarized string accurately reflects the + * internal type which may matter for figuring out bugs etc. + */ + /* XXX: Hex encoded, length limited buffer summary here? */ + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h != NULL); + duk_push_sprintf(thr, "[buffer:%ld]", (long) DUK_HBUFFER_GET_SIZE(h)); + break; + } + case DUK_TAG_POINTER: { + /* Surround with parentheses like in JX, ensures NULL pointer + * is distinguishable from null value ("(null)" vs "null"). + */ + duk_push_tval(thr, tv); + duk_push_sprintf(thr, "(%s)", duk_to_string(thr, -1)); + duk_remove_m2(thr); + break; + } + default: { + duk_push_tval(thr, tv); + break; + } + } + } + + return duk_to_string(thr, -1); +} +DUK_INTERNAL const char *duk_push_string_tval_readable(duk_hthread *thr, duk_tval *tv) { + DUK_ASSERT_API_ENTRY(thr); + return duk__push_string_tval_readable(thr, tv, 0 /*error_aware*/); +} + +DUK_INTERNAL const char *duk_push_string_readable(duk_hthread *thr, duk_idx_t idx) { + DUK_ASSERT_API_ENTRY(thr); + return duk_push_string_tval_readable(thr, duk_get_tval(thr, idx)); +} + +DUK_INTERNAL const char *duk_push_string_tval_readable_error(duk_hthread *thr, duk_tval *tv) { + DUK_ASSERT_API_ENTRY(thr); + return duk__push_string_tval_readable(thr, tv, 1 /*error_aware*/); +} + +DUK_INTERNAL void duk_push_symbol_descriptive_string(duk_hthread *thr, duk_hstring *h) { + const duk_uint8_t *p; + const duk_uint8_t *p_end; + const duk_uint8_t *q; + + DUK_ASSERT_API_ENTRY(thr); + + /* .toString() */ + duk_push_literal(thr, "Symbol("); + p = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h); + p_end = p + DUK_HSTRING_GET_BYTELEN(h); + DUK_ASSERT(p[0] == 0xff || (p[0] & 0xc0) == 0x80); + p++; + for (q = p; q < p_end; q++) { + if (*q == 0xffU) { + /* Terminate either at end-of-string (but NUL MUST + * be accepted without terminating description) or + * 0xFF, which is used to mark start of unique trailer + * (and cannot occur in CESU-8 / extended UTF-8). + */ + break; + } + } + duk_push_lstring(thr, (const char *) p, (duk_size_t) (q - p)); + duk_push_literal(thr, ")"); + duk_concat(thr, 3); +} + +/* + * Functions + */ + +#if 0 /* not used yet */ +DUK_INTERNAL void duk_push_hnatfunc_name(duk_hthread *thr, duk_hnatfunc *h) { + duk_c_function func; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_NATFUNC((duk_hobject *) h)); + + duk_push_sprintf(thr, "native_"); + func = h->func; + duk_push_string_funcptr(thr, (duk_uint8_t *) &func, sizeof(func)); + duk_push_sprintf(thr, "_%04x_%04x", + (unsigned int) (duk_uint16_t) h->nargs, + (unsigned int) (duk_uint16_t) h->magic); + duk_concat(thr, 3); +} +#endif + +/* + * duk_tval slice copy + */ + +DUK_INTERNAL void duk_copy_tvals_incref(duk_hthread *thr, duk_tval *tv_dst, duk_tval *tv_src, duk_size_t count) { + duk_tval *tv; + + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(thr); + DUK_ASSERT(count * sizeof(duk_tval) >= count); /* no wrap */ + + duk_memcpy_unsafe((void *) tv_dst, (const void *) tv_src, count * sizeof(duk_tval)); + + tv = tv_dst; + while (count-- > 0) { + DUK_TVAL_INCREF(thr, tv); + tv++; + } +} + +/* automatic undefs */ +#undef DUK__ASSERT_SPACE +#undef DUK__CHECK_SPACE +#undef DUK__ERROR_STASH_SHARED +#undef DUK__PACK_ARGS +#undef DUK__READABLE_ERRMSG_MAXCHARS +#undef DUK__READABLE_STRING_MAXCHARS +#undef DUK__READABLE_SUMMARY_MAXCHARS +#line 1 "duk_api_string.c" +/* + * String manipulation + */ + +/* #include duk_internal.h -> already included */ + +DUK_LOCAL void duk__concat_and_join_helper(duk_hthread *thr, duk_idx_t count_in, duk_bool_t is_join) { + duk_uint_t count; + duk_uint_t i; + duk_size_t idx; + duk_size_t len; + duk_hstring *h; + duk_uint8_t *buf; + + DUK_ASSERT_CTX_VALID(thr); + + if (DUK_UNLIKELY(count_in <= 0)) { + if (count_in < 0) { + DUK_ERROR_RANGE_INVALID_COUNT(thr); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(count_in == 0); + duk_push_hstring_empty(thr); + return; + } + count = (duk_uint_t) count_in; + + if (is_join) { + duk_size_t t1, t2, limit; + h = duk_to_hstring(thr, -((duk_idx_t) count) - 1); + DUK_ASSERT(h != NULL); + + /* A bit tricky overflow test, see doc/code-issues.rst. */ + t1 = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h); + t2 = (duk_size_t) (count - 1); + limit = (duk_size_t) DUK_HSTRING_MAX_BYTELEN; + if (DUK_UNLIKELY(t2 != 0 && t1 > limit / t2)) { + /* Combined size of separators already overflows. */ + goto error_overflow; + } + len = (duk_size_t) (t1 * t2); + } else { + len = (duk_size_t) 0; + } + + for (i = count; i >= 1; i--) { + duk_size_t new_len; + h = duk_to_hstring(thr, -((duk_idx_t) i)); + new_len = len + (duk_size_t) DUK_HSTRING_GET_BYTELEN(h); + + /* Impose a string maximum length, need to handle overflow + * correctly. + */ + if (new_len < len || /* wrapped */ + new_len > (duk_size_t) DUK_HSTRING_MAX_BYTELEN) { + goto error_overflow; + } + len = new_len; + } + + DUK_DDD(DUK_DDDPRINT("join/concat %lu strings, total length %lu bytes", + (unsigned long) count, (unsigned long) len)); + + /* Use stack allocated buffer to ensure reachability in errors + * (e.g. intern error). + */ + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, len); + DUK_ASSERT(buf != NULL); + + /* [ ... (sep) str1 str2 ... strN buf ] */ + + idx = 0; + for (i = count; i >= 1; i--) { + if (is_join && i != count) { + h = duk_require_hstring(thr, -((duk_idx_t) count) - 2); /* extra -1 for buffer */ + duk_memcpy(buf + idx, DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); + idx += DUK_HSTRING_GET_BYTELEN(h); + } + h = duk_require_hstring(thr, -((duk_idx_t) i) - 1); /* extra -1 for buffer */ + duk_memcpy(buf + idx, DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); + idx += DUK_HSTRING_GET_BYTELEN(h); + } + + DUK_ASSERT(idx == len); + + /* [ ... (sep) str1 str2 ... strN buf ] */ + + /* Get rid of the strings early to minimize memory use before intern. */ + + if (is_join) { + duk_replace(thr, -((duk_idx_t) count) - 2); /* overwrite sep */ + duk_pop_n(thr, (duk_idx_t) count); + } else { + duk_replace(thr, -((duk_idx_t) count) - 1); /* overwrite str1 */ + duk_pop_n(thr, (duk_idx_t) (count - 1)); + } + + /* [ ... buf ] */ + + (void) duk_buffer_to_string(thr, -1); /* Safe if inputs are safe. */ + + /* [ ... res ] */ + return; + + error_overflow: + DUK_ERROR_RANGE(thr, DUK_STR_RESULT_TOO_LONG); + DUK_WO_NORETURN(return;); +} + +DUK_EXTERNAL void duk_concat(duk_hthread *thr, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + + duk__concat_and_join_helper(thr, count, 0 /*is_join*/); +} + +#if defined(DUK_USE_PREFER_SIZE) +DUK_INTERNAL void duk_concat_2(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + duk_concat(thr, 2); +} +#else /* DUK_USE_PREFER_SIZE */ +DUK_INTERNAL void duk_concat_2(duk_hthread *thr) { + duk_hstring *h1; + duk_hstring *h2; + duk_uint8_t *buf; + duk_size_t len1; + duk_size_t len2; + duk_size_t len; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(duk_get_top(thr) >= 2); /* Trusted caller. */ + + h1 = duk_to_hstring(thr, -2); + h2 = duk_to_hstring(thr, -1); + len1 = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h1); + len2 = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h2); + len = len1 + len2; + if (DUK_UNLIKELY(len < len1 || /* wrapped */ + len > (duk_size_t) DUK_HSTRING_MAX_BYTELEN)) { + goto error_overflow; + } + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, len); + DUK_ASSERT(buf != NULL); + + duk_memcpy((void *) buf, (const void *) DUK_HSTRING_GET_DATA(h1), (size_t) len1); + duk_memcpy((void *) (buf + len1), (const void *) DUK_HSTRING_GET_DATA(h2), (size_t) len2); + (void) duk_buffer_to_string(thr, -1); /* Safe if inputs are safe. */ + + /* [ ... str1 str2 buf ] */ + + duk_replace(thr, -3); + duk_pop_unsafe(thr); + return; + + error_overflow: + DUK_ERROR_RANGE(thr, DUK_STR_RESULT_TOO_LONG); + DUK_WO_NORETURN(return;); +} +#endif /* DUK_USE_PREFER_SIZE */ + +DUK_EXTERNAL void duk_join(duk_hthread *thr, duk_idx_t count) { + DUK_ASSERT_API_ENTRY(thr); + + duk__concat_and_join_helper(thr, count, 1 /*is_join*/); +} + +/* XXX: could map/decode be unified with duk_unicode_support.c code? + * Case conversion needs also the character surroundings though. + */ + +DUK_EXTERNAL void duk_decode_string(duk_hthread *thr, duk_idx_t idx, duk_decode_char_function callback, void *udata) { + duk_hstring *h_input; + const duk_uint8_t *p, *p_start, *p_end; + duk_codepoint_t cp; + + DUK_ASSERT_API_ENTRY(thr); + + h_input = duk_require_hstring(thr, idx); /* Accept symbols. */ + DUK_ASSERT(h_input != NULL); + + p_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_input); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input); + p = p_start; + + for (;;) { + if (p >= p_end) { + break; + } + cp = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(thr, &p, p_start, p_end); + callback(udata, cp); + } +} + +DUK_EXTERNAL void duk_map_string(duk_hthread *thr, duk_idx_t idx, duk_map_char_function callback, void *udata) { + duk_hstring *h_input; + duk_bufwriter_ctx bw_alloc; + duk_bufwriter_ctx *bw; + const duk_uint8_t *p, *p_start, *p_end; + duk_codepoint_t cp; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_normalize_index(thr, idx); + + h_input = duk_require_hstring(thr, idx); /* Accept symbols. */ + DUK_ASSERT(h_input != NULL); + + bw = &bw_alloc; + DUK_BW_INIT_PUSHBUF(thr, bw, DUK_HSTRING_GET_BYTELEN(h_input)); /* Reasonable output estimate. */ + + p_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_input); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input); + p = p_start; + + for (;;) { + /* XXX: could write output in chunks with fewer ensure calls, + * but relative benefit would be small here. + */ + + if (p >= p_end) { + break; + } + cp = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(thr, &p, p_start, p_end); + cp = callback(udata, cp); + + DUK_BW_WRITE_ENSURE_XUTF8(thr, bw, cp); + } + + DUK_BW_COMPACT(thr, bw); + (void) duk_buffer_to_string(thr, -1); /* Safe, extended UTF-8 encoded. */ + duk_replace(thr, idx); +} + +DUK_EXTERNAL void duk_substring(duk_hthread *thr, duk_idx_t idx, duk_size_t start_offset, duk_size_t end_offset) { + duk_hstring *h; + duk_hstring *res; + duk_size_t start_byte_offset; + duk_size_t end_byte_offset; + duk_size_t charlen; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); /* Accept symbols. */ + h = duk_require_hstring(thr, idx); + DUK_ASSERT(h != NULL); + + charlen = DUK_HSTRING_GET_CHARLEN(h); + if (end_offset >= charlen) { + end_offset = charlen; + } + if (start_offset > end_offset) { + start_offset = end_offset; + } + + DUK_ASSERT_DISABLE(start_offset >= 0); + DUK_ASSERT(start_offset <= end_offset && start_offset <= DUK_HSTRING_GET_CHARLEN(h)); + DUK_ASSERT_DISABLE(end_offset >= 0); + DUK_ASSERT(end_offset >= start_offset && end_offset <= DUK_HSTRING_GET_CHARLEN(h)); + + /* Guaranteed by string limits. */ + DUK_ASSERT(start_offset <= DUK_UINT32_MAX); + DUK_ASSERT(end_offset <= DUK_UINT32_MAX); + + start_byte_offset = (duk_size_t) duk_heap_strcache_offset_char2byte(thr, h, (duk_uint_fast32_t) start_offset); + end_byte_offset = (duk_size_t) duk_heap_strcache_offset_char2byte(thr, h, (duk_uint_fast32_t) end_offset); + + DUK_ASSERT(end_byte_offset >= start_byte_offset); + DUK_ASSERT(end_byte_offset - start_byte_offset <= DUK_UINT32_MAX); /* Guaranteed by string limits. */ + + /* No size check is necessary. */ + res = duk_heap_strtable_intern_checked(thr, + DUK_HSTRING_GET_DATA(h) + start_byte_offset, + (duk_uint32_t) (end_byte_offset - start_byte_offset)); + + duk_push_hstring(thr, res); + duk_replace(thr, idx); +} + +/* XXX: this is quite clunky. Add Unicode helpers to scan backwards and + * forwards with a callback to process codepoints? + */ +DUK_EXTERNAL void duk_trim(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + const duk_uint8_t *p, *p_start, *p_end, *p_tmp1, *p_tmp2; /* pointers for scanning */ + const duk_uint8_t *q_start, *q_end; /* start (incl) and end (excl) of trimmed part */ + duk_codepoint_t cp; + + DUK_ASSERT_API_ENTRY(thr); + + idx = duk_require_normalize_index(thr, idx); /* Accept symbols. */ + h = duk_require_hstring(thr, idx); + DUK_ASSERT(h != NULL); + + p_start = DUK_HSTRING_GET_DATA(h); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h); + + p = p_start; + while (p < p_end) { + p_tmp1 = p; + cp = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(thr, &p_tmp1, p_start, p_end); + if (!(duk_unicode_is_whitespace(cp) || duk_unicode_is_line_terminator(cp))) { + break; + } + p = p_tmp1; + } + q_start = p; + if (p == p_end) { + /* Entire string is whitespace. */ + q_end = p; + goto scan_done; + } + + p = p_end; + while (p > p_start) { + p_tmp1 = p; + while (p > p_start) { + p--; + if (((*p) & 0xc0) != 0x80) { + break; + } + } + p_tmp2 = p; + + cp = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(thr, &p_tmp2, p_start, p_end); + if (!(duk_unicode_is_whitespace(cp) || duk_unicode_is_line_terminator(cp))) { + p = p_tmp1; + break; + } + } + q_end = p; + + scan_done: + /* This may happen when forward and backward scanning disagree + * (possible for non-extended-UTF-8 strings). + */ + if (q_end < q_start) { + q_end = q_start; + } + + DUK_ASSERT(q_start >= p_start && q_start <= p_end); + DUK_ASSERT(q_end >= p_start && q_end <= p_end); + DUK_ASSERT(q_end >= q_start); + + DUK_DDD(DUK_DDDPRINT("trim: p_start=%p, p_end=%p, q_start=%p, q_end=%p", + (const void *) p_start, (const void *) p_end, + (const void *) q_start, (const void *) q_end)); + + if (q_start == p_start && q_end == p_end) { + DUK_DDD(DUK_DDDPRINT("nothing was trimmed: avoid interning (hashing etc)")); + return; + } + + duk_push_lstring(thr, (const char *) q_start, (duk_size_t) (q_end - q_start)); + duk_replace(thr, idx); +} + +DUK_EXTERNAL duk_codepoint_t duk_char_code_at(duk_hthread *thr, duk_idx_t idx, duk_size_t char_offset) { + duk_hstring *h; + duk_ucodepoint_t cp; + + DUK_ASSERT_API_ENTRY(thr); + + /* XXX: Share code with String.prototype.charCodeAt? Main difference + * is handling of clamped offsets. + */ + + h = duk_require_hstring(thr, idx); /* Accept symbols. */ + DUK_ASSERT(h != NULL); + + DUK_ASSERT_DISABLE(char_offset >= 0); /* Always true, arg is unsigned. */ + if (char_offset >= DUK_HSTRING_GET_CHARLEN(h)) { + return 0; + } + + DUK_ASSERT(char_offset <= DUK_UINT_MAX); /* Guaranteed by string limits. */ + cp = duk_hstring_char_code_at_raw(thr, h, (duk_uint_t) char_offset, 0 /*surrogate_aware*/); + return (duk_codepoint_t) cp; +} +#line 1 "duk_api_time.c" +/* + * Date/time. + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL duk_double_t duk_time_get_ecmascript_time(duk_hthread *thr) { + /* ECMAScript time, with millisecond fractions. Exposed via + * duk_get_now() for example. + */ + DUK_UNREF(thr); + return (duk_double_t) DUK_USE_DATE_GET_NOW(thr); +} + +DUK_INTERNAL duk_double_t duk_time_get_ecmascript_time_nofrac(duk_hthread *thr) { + /* ECMAScript time without millisecond fractions. Exposed via + * the Date built-in which doesn't allow fractions. + */ + DUK_UNREF(thr); + return (duk_double_t) DUK_FLOOR(DUK_USE_DATE_GET_NOW(thr)); +} + +DUK_INTERNAL duk_double_t duk_time_get_monotonic_time(duk_hthread *thr) { + DUK_UNREF(thr); +#if defined(DUK_USE_GET_MONOTONIC_TIME) + return (duk_double_t) DUK_USE_GET_MONOTONIC_TIME(thr); +#else + return (duk_double_t) DUK_USE_DATE_GET_NOW(thr); +#endif +} + +DUK_EXTERNAL duk_double_t duk_get_now(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(thr); + + /* This API intentionally allows millisecond fractions. */ + return duk_time_get_ecmascript_time(thr); +} + +#if 0 /* XXX: worth exposing? */ +DUK_EXTERNAL duk_double_t duk_get_monotonic_time(duk_hthread *thr) { + DUK_ASSERT_API_ENTRY(thr); + DUK_UNREF(thr); + + return duk_time_get_monotonic_time(thr); +} +#endif + +DUK_EXTERNAL void duk_time_to_components(duk_hthread *thr, duk_double_t timeval, duk_time_components *comp) { + duk_int_t parts[DUK_DATE_IDX_NUM_PARTS]; + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + duk_uint_t flags; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(comp != NULL); /* XXX: or check? */ + DUK_UNREF(thr); + + /* Convert as one-based, but change month to zero-based to match the + * ECMAScript Date built-in behavior 1:1. + */ + flags = DUK_DATE_FLAG_ONEBASED | DUK_DATE_FLAG_NAN_TO_ZERO; + + duk_bi_date_timeval_to_parts(timeval, parts, dparts, flags); + + /* XXX: sub-millisecond accuracy for the API */ + + DUK_ASSERT(dparts[DUK_DATE_IDX_MONTH] >= 1.0 && dparts[DUK_DATE_IDX_MONTH] <= 12.0); + comp->year = dparts[DUK_DATE_IDX_YEAR]; + comp->month = dparts[DUK_DATE_IDX_MONTH] - 1.0; + comp->day = dparts[DUK_DATE_IDX_DAY]; + comp->hours = dparts[DUK_DATE_IDX_HOUR]; + comp->minutes = dparts[DUK_DATE_IDX_MINUTE]; + comp->seconds = dparts[DUK_DATE_IDX_SECOND]; + comp->milliseconds = dparts[DUK_DATE_IDX_MILLISECOND]; + comp->weekday = dparts[DUK_DATE_IDX_WEEKDAY]; +} + +DUK_EXTERNAL duk_double_t duk_components_to_time(duk_hthread *thr, duk_time_components *comp) { + duk_double_t d; + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + duk_uint_t flags; + + DUK_ASSERT_API_ENTRY(thr); + DUK_ASSERT(comp != NULL); /* XXX: or check? */ + DUK_UNREF(thr); + + /* Match Date constructor behavior (with UTC time). Month is given + * as zero-based. Day-of-month is given as one-based so normalize + * it to zero-based as the internal conversion helpers expects all + * components to be zero-based. + */ + flags = 0; + + /* XXX: expensive conversion; use array format in API instead, or unify + * time provider and time API to use same struct? + */ + + dparts[DUK_DATE_IDX_YEAR] = comp->year; + dparts[DUK_DATE_IDX_MONTH] = comp->month; + dparts[DUK_DATE_IDX_DAY] = comp->day - 1.0; + dparts[DUK_DATE_IDX_HOUR] = comp->hours; + dparts[DUK_DATE_IDX_MINUTE] = comp->minutes; + dparts[DUK_DATE_IDX_SECOND] = comp->seconds; + dparts[DUK_DATE_IDX_MILLISECOND] = comp->milliseconds; + dparts[DUK_DATE_IDX_WEEKDAY] = 0; /* ignored */ + + d = duk_bi_date_get_timeval_from_dparts(dparts, flags); + + return d; +} +#line 1 "duk_bi_array.c" +/* + * Array built-ins + * + * Most Array built-ins are intentionally generic in ECMAScript, and are + * intended to work even when the 'this' binding is not an Array instance. + * This ECMAScript feature is also used by much real world code. For this + * reason the implementations here don't assume exotic Array behavior or + * e.g. presence of a .length property. However, some algorithms have a + * fast path for duk_harray backed actual Array instances, enabled when + * footprint is not a concern. + * + * XXX: the "Throw" flag should be set for (almost?) all [[Put]] and + * [[Delete]] operations, but it's currently false throughout. Go through + * all put/delete cases and check throw flag use. Need a new API primitive + * which allows throws flag to be specified. + * + * XXX: array lengths above 2G won't work reliably. There are many places + * where one needs a full signed 32-bit range ([-0xffffffff, 0xffffffff], + * i.e. -33- bits). Although array 'length' cannot be written to be outside + * the unsigned 32-bit range (E5.1 Section 15.4.5.1 throws a RangeError if so) + * some intermediate values may be above 0xffffffff and this may not be always + * correctly handled now (duk_uint32_t is not enough for all algorithms). + * For instance, push() can legitimately write entries beyond length 0xffffffff + * and cause a RangeError only at the end. To do this properly, the current + * push() implementation tracks the array index using a 'double' instead of a + * duk_uint32_t (which is somewhat awkward). See test-bi-array-push-maxlen.js. + * + * On using "put" vs. "def" prop + * ============================= + * + * Code below must be careful to use the appropriate primitive as it matters + * for compliance. When using "put" there may be inherited properties in + * Array.prototype which cause side effects when values are written. When + * using "define" there are no such side effects, and many test262 test cases + * check for this (for real world code, such side effects are very rare). + * Both "put" and "define" are used in the E5.1 specification; as a rule, + * "put" is used when modifying an existing array (or a non-array 'this' + * binding) and "define" for setting values into a fresh result array. + */ + +/* #include duk_internal.h -> already included */ + +/* Perform an intermediate join when this many elements have been pushed + * on the value stack. + */ +#define DUK__ARRAY_MID_JOIN_LIMIT 4096 + +#if defined(DUK_USE_ARRAY_BUILTIN) + +/* + * Shared helpers. + */ + +/* Shared entry code for many Array built-ins: the 'this' binding is pushed + * on the value stack and object coerced, and the current .length is returned. + * Note that length is left on stack (it could be popped, but that's not + * usually necessary because call handling will clean it up automatically). + */ +DUK_LOCAL duk_uint32_t duk__push_this_obj_len_u32(duk_hthread *thr) { + duk_uint32_t len; + + /* XXX: push more directly? */ + (void) duk_push_this_coercible_to_object(thr); + DUK_ASSERT_HOBJECT_VALID(duk_get_hobject(thr, -1)); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_LENGTH); + len = duk_to_uint32(thr, -1); + + /* -> [ ... ToObject(this) ToUint32(length) ] */ + return len; +} + +DUK_LOCAL duk_uint32_t duk__push_this_obj_len_u32_limited(duk_hthread *thr) { + /* Range limited to [0, 0x7fffffff] range, i.e. range that can be + * represented with duk_int32_t. Use this when the method doesn't + * handle the full 32-bit unsigned range correctly. + */ + duk_uint32_t ret = duk__push_this_obj_len_u32(thr); + if (DUK_UNLIKELY(ret >= 0x80000000UL)) { + DUK_ERROR_RANGE_INVALID_LENGTH(thr); + DUK_WO_NORETURN(return 0U;); + } + return ret; +} + +#if defined(DUK_USE_ARRAY_FASTPATH) +/* Check if 'this' binding is an Array instance (duk_harray) which satisfies + * a few other guarantees for fast path operation. The fast path doesn't + * need to handle all operations, even for duk_harrays, but must handle a + * significant fraction to improve performance. Return a non-NULL duk_harray + * pointer when all fast path criteria are met, NULL otherwise. + */ +DUK_LOCAL duk_harray *duk__arraypart_fastpath_this(duk_hthread *thr) { + duk_tval *tv; + duk_hobject *h; + duk_uint_t flags_mask, flags_bits, flags_value; + + DUK_ASSERT(thr->valstack_bottom > thr->valstack); /* because call in progress */ + tv = DUK_GET_THIS_TVAL_PTR(thr); + + /* Fast path requires that 'this' is a duk_harray. Read only arrays + * (ROM backed) are also rejected for simplicity. + */ + if (!DUK_TVAL_IS_OBJECT(tv)) { + DUK_DD(DUK_DDPRINT("reject array fast path: not an object")); + return NULL; + } + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + flags_mask = DUK_HOBJECT_FLAG_ARRAY_PART | \ + DUK_HOBJECT_FLAG_EXOTIC_ARRAY | \ + DUK_HEAPHDR_FLAG_READONLY; + flags_bits = DUK_HOBJECT_FLAG_ARRAY_PART | \ + DUK_HOBJECT_FLAG_EXOTIC_ARRAY; + flags_value = DUK_HEAPHDR_GET_FLAGS_RAW((duk_heaphdr *) h); + if ((flags_value & flags_mask) != flags_bits) { + DUK_DD(DUK_DDPRINT("reject array fast path: object flag check failed")); + return NULL; + } + + /* In some cases a duk_harray's 'length' may be larger than the + * current array part allocation. Avoid the fast path in these + * cases, so that all fast path code can safely assume that all + * items in the range [0,length[ are backed by the current array + * part allocation. + */ + if (((duk_harray *) h)->length > DUK_HOBJECT_GET_ASIZE(h)) { + DUK_DD(DUK_DDPRINT("reject array fast path: length > array part size")); + return NULL; + } + + /* Guarantees for fast path. */ + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_ASIZE(h) == 0 || DUK_HOBJECT_A_GET_BASE(thr->heap, h) != NULL); + DUK_ASSERT(((duk_harray *) h)->length <= DUK_HOBJECT_GET_ASIZE(h)); + + DUK_DD(DUK_DDPRINT("array fast path allowed for: %!O", (duk_heaphdr *) h)); + return (duk_harray *) h; +} +#endif /* DUK_USE_ARRAY_FASTPATH */ + +/* + * Constructor + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_constructor(duk_hthread *thr) { + duk_idx_t nargs; + duk_harray *a; + duk_double_t d; + duk_uint32_t len; + duk_uint32_t len_prealloc; + + nargs = duk_get_top(thr); + + if (nargs == 1 && duk_is_number(thr, 0)) { + /* XXX: expensive check (also shared elsewhere - so add a shared internal API call?) */ + d = duk_get_number(thr, 0); + len = duk_to_uint32(thr, 0); + if (((duk_double_t) len) != d) { + DUK_DCERROR_RANGE_INVALID_LENGTH(thr); + } + + /* For small lengths create a dense preallocated array. + * For large arrays preallocate an initial part. + */ + len_prealloc = len < 64 ? len : 64; + a = duk_push_harray_with_size(thr, len_prealloc); + DUK_ASSERT(a != NULL); + a->length = len; + return 1; + } + + duk_pack(thr, nargs); + return 1; +} + +/* + * isArray() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_constructor_is_array(duk_hthread *thr) { + duk_hobject *h; + + h = duk_get_hobject_with_class(thr, 0, DUK_HOBJECT_CLASS_ARRAY); + duk_push_boolean(thr, (h != NULL)); + return 1; +} + +/* + * toString() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_to_string(duk_hthread *thr) { + (void) duk_push_this_coercible_to_object(thr); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_JOIN); + + /* [ ... this func ] */ + if (!duk_is_callable(thr, -1)) { + /* Fall back to the initial (original) Object.toString(). We don't + * currently have pointers to the built-in functions, only the top + * level global objects (like "Array") so this is now done in a bit + * of a hacky manner. It would be cleaner to push the (original) + * function and use duk_call_method(). + */ + + /* XXX: 'this' will be ToObject() coerced twice, which is incorrect + * but should have no visible side effects. + */ + DUK_DDD(DUK_DDDPRINT("this.join is not callable, fall back to (original) Object.toString")); + duk_set_top(thr, 0); + return duk_bi_object_prototype_to_string(thr); /* has access to 'this' binding */ + } + + /* [ ... this func ] */ + + duk_insert(thr, -2); + + /* [ ... func this ] */ + + DUK_DDD(DUK_DDDPRINT("calling: func=%!iT, this=%!iT", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + duk_call_method(thr, 0); + + return 1; +} + +/* + * concat() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_concat(duk_hthread *thr) { + duk_idx_t i, n; + duk_uint32_t j, idx, len; + duk_hobject *h; + duk_size_t tmp_len; + + /* XXX: In ES2015 Array .length can be up to 2^53-1. The current + * implementation is limited to 2^32-1. + */ + + /* XXX: Fast path for array 'this' and array element. */ + + /* XXX: The insert here is a bit expensive if there are a lot of items. + * It could also be special cased in the outermost for loop quite easily + * (as the element is dup()'d anyway). + */ + + (void) duk_push_this_coercible_to_object(thr); + duk_insert(thr, 0); + n = duk_get_top(thr); + duk_push_array(thr); /* -> [ ToObject(this) item1 ... itemN arr ] */ + + /* NOTE: The Array special behaviors are NOT invoked by duk_xdef_prop_index() + * (which differs from the official algorithm). If no error is thrown, this + * doesn't matter as the length is updated at the end. However, if an error + * is thrown, the length will be unset. That shouldn't matter because the + * caller won't get a reference to the intermediate value. + */ + + idx = 0; + for (i = 0; i < n; i++) { + duk_bool_t spreadable; + duk_bool_t need_has_check; + + DUK_ASSERT_TOP(thr, n + 1); + + /* [ ToObject(this) item1 ... itemN arr ] */ + + h = duk_get_hobject(thr, i); + + if (h == NULL) { + spreadable = 0; + } else { +#if defined(DUK_USE_SYMBOL_BUILTIN) + duk_get_prop_stridx(thr, i, DUK_STRIDX_WELLKNOWN_SYMBOL_IS_CONCAT_SPREADABLE); + if (duk_is_undefined(thr, -1)) { + spreadable = (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_ARRAY); + } else { + spreadable = duk_to_boolean(thr, -1); + } + duk_pop_nodecref_unsafe(thr); +#else + spreadable = (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_ARRAY); +#endif + } + + if (!spreadable) { + duk_dup(thr, i); + duk_xdef_prop_index_wec(thr, -2, idx); + idx++; + if (DUK_UNLIKELY(idx == 0U)) { + /* Index after update is 0, and index written + * was 0xffffffffUL which is no longer a valid + * array index. + */ + goto fail_wrap; + } + continue; + } + + DUK_ASSERT(duk_is_object(thr, i)); + need_has_check = (DUK_HOBJECT_IS_PROXY(h) != 0); /* Always 0 w/o Proxy support. */ + + /* [ ToObject(this) item1 ... itemN arr ] */ + + tmp_len = duk_get_length(thr, i); + len = (duk_uint32_t) tmp_len; + if (DUK_UNLIKELY(tmp_len != (duk_size_t) len)) { + goto fail_wrap; + } + if (DUK_UNLIKELY(idx + len < idx)) { + /* Result length must be at most 0xffffffffUL to be + * a valid 32-bit array index. + */ + goto fail_wrap; + } + for (j = 0; j < len; j++) { + /* For a Proxy element, an explicit 'has' check is + * needed to allow the Proxy to present gaps. + */ + if (need_has_check) { + if (duk_has_prop_index(thr, i, j)) { + duk_get_prop_index(thr, i, j); + duk_xdef_prop_index_wec(thr, -2, idx); + } + } else { + if (duk_get_prop_index(thr, i, j)) { + duk_xdef_prop_index_wec(thr, -2, idx); + } else { + duk_pop_undefined(thr); + } + } + idx++; + DUK_ASSERT(idx != 0U); /* Wrap check above. */ + } + } + + /* ES5.1 has a specification "bug" in that nonexistent trailing + * elements don't affect the result .length. Test262 and other + * engines disagree, and the specification bug was fixed in ES2015 + * (see NOTE 1 in https://www.ecma-international.org/ecma-262/6.0/#sec-array.prototype.concat). + */ + duk_push_uarridx(thr, idx); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_W); + + DUK_ASSERT_TOP(thr, n + 1); + return 1; + + fail_wrap: + DUK_ERROR_RANGE_INVALID_LENGTH(thr); + DUK_WO_NORETURN(return 0;); +} + +/* + * join(), toLocaleString() + * + * Note: checking valstack is necessary, but only in the per-element loop. + * + * Note: the trivial approach of pushing all the elements on the value stack + * and then calling duk_join() fails when the array contains a large number + * of elements. This problem can't be offloaded to duk_join() because the + * elements to join must be handled here and have special handling. Current + * approach is to do intermediate joins with very large number of elements. + * There is no fancy handling; the prefix gets re-joined multiple times. + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_join_shared(duk_hthread *thr) { + duk_uint32_t len, count; + duk_uint32_t idx; + duk_small_int_t to_locale_string = duk_get_current_magic(thr); + duk_idx_t valstack_required; + + /* For join(), nargs is 1. For toLocaleString(), nargs is 0 and + * setting the top essentially pushes an undefined to the stack, + * thus defaulting to a comma separator. + */ + duk_set_top(thr, 1); + if (duk_is_undefined(thr, 0)) { + duk_pop_undefined(thr); + duk_push_hstring_stridx(thr, DUK_STRIDX_COMMA); + } else { + duk_to_string(thr, 0); + } + + len = duk__push_this_obj_len_u32(thr); + + /* [ sep ToObject(this) len ] */ + + DUK_DDD(DUK_DDDPRINT("sep=%!T, this=%!T, len=%lu", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1), + (unsigned long) len)); + + /* The extra (+4) is tight. */ + valstack_required = (duk_idx_t) ((len >= DUK__ARRAY_MID_JOIN_LIMIT ? + DUK__ARRAY_MID_JOIN_LIMIT : len) + 4); + duk_require_stack(thr, valstack_required); + + duk_dup_0(thr); + + /* [ sep ToObject(this) len sep ] */ + + count = 0; + idx = 0; + for (;;) { + DUK_DDD(DUK_DDDPRINT("join idx=%ld", (long) idx)); + if (count >= DUK__ARRAY_MID_JOIN_LIMIT || /* intermediate join to avoid valstack overflow */ + idx >= len) { /* end of loop (careful with len==0) */ + /* [ sep ToObject(this) len sep str0 ... str(count-1) ] */ + DUK_DDD(DUK_DDDPRINT("mid/final join, count=%ld, idx=%ld, len=%ld", + (long) count, (long) idx, (long) len)); + duk_join(thr, (duk_idx_t) count); /* -> [ sep ToObject(this) len str ] */ + duk_dup_0(thr); /* -> [ sep ToObject(this) len str sep ] */ + duk_insert(thr, -2); /* -> [ sep ToObject(this) len sep str ] */ + count = 1; + } + if (idx >= len) { + /* if true, the stack already contains the final result */ + break; + } + + duk_get_prop_index(thr, 1, (duk_uarridx_t) idx); + if (duk_is_null_or_undefined(thr, -1)) { + duk_pop_nodecref_unsafe(thr); + duk_push_hstring_empty(thr); + } else { + if (to_locale_string) { + duk_to_object(thr, -1); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_TO_LOCALE_STRING); + duk_insert(thr, -2); /* -> [ ... toLocaleString ToObject(val) ] */ + duk_call_method(thr, 0); + } + duk_to_string(thr, -1); + } + + count++; + idx++; + } + + /* [ sep ToObject(this) len sep result ] */ + + return 1; +} + +/* + * pop(), push() + */ + +#if defined(DUK_USE_ARRAY_FASTPATH) +DUK_LOCAL duk_ret_t duk__array_pop_fastpath(duk_hthread *thr, duk_harray *h_arr) { + duk_tval *tv_arraypart; + duk_tval *tv_val; + duk_uint32_t len; + + tv_arraypart = DUK_HOBJECT_A_GET_BASE(thr->heap, (duk_hobject *) h_arr); + len = h_arr->length; + if (len <= 0) { + /* nop, return undefined */ + return 0; + } + + len--; + h_arr->length = len; + + /* Fast path doesn't check for an index property inherited from + * Array.prototype. This is quite often acceptable; if not, + * disable fast path. + */ + DUK_ASSERT_VS_SPACE(thr); + tv_val = tv_arraypart + len; + if (DUK_TVAL_IS_UNUSED(tv_val)) { + /* No net refcount change. Value stack already has + * 'undefined' based on value stack init policy. + */ + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); + DUK_ASSERT(DUK_TVAL_IS_UNUSED(tv_val)); + } else { + /* No net refcount change. */ + DUK_TVAL_SET_TVAL(thr->valstack_top, tv_val); + DUK_TVAL_SET_UNUSED(tv_val); + } + thr->valstack_top++; + + /* XXX: there's no shrink check in the fast path now */ + + return 1; +} +#endif /* DUK_USE_ARRAY_FASTPATH */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_pop(duk_hthread *thr) { + duk_uint32_t len; + duk_uint32_t idx; +#if defined(DUK_USE_ARRAY_FASTPATH) + duk_harray *h_arr; +#endif + + DUK_ASSERT_TOP(thr, 0); + +#if defined(DUK_USE_ARRAY_FASTPATH) + h_arr = duk__arraypart_fastpath_this(thr); + if (h_arr) { + return duk__array_pop_fastpath(thr, h_arr); + } +#endif + + /* XXX: Merge fastpath check into a related call (push this, coerce length, etc)? */ + + len = duk__push_this_obj_len_u32(thr); + if (len == 0) { + duk_push_int(thr, 0); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LENGTH); + return 0; + } + idx = len - 1; + + duk_get_prop_index(thr, 0, (duk_uarridx_t) idx); + duk_del_prop_index(thr, 0, (duk_uarridx_t) idx); + duk_push_u32(thr, idx); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LENGTH); + return 1; +} + +#if defined(DUK_USE_ARRAY_FASTPATH) +DUK_LOCAL duk_ret_t duk__array_push_fastpath(duk_hthread *thr, duk_harray *h_arr) { + duk_tval *tv_arraypart; + duk_tval *tv_src; + duk_tval *tv_dst; + duk_uint32_t len; + duk_idx_t i, n; + + len = h_arr->length; + tv_arraypart = DUK_HOBJECT_A_GET_BASE(thr->heap, (duk_hobject *) h_arr); + + n = (duk_idx_t) (thr->valstack_top - thr->valstack_bottom); + DUK_ASSERT(n >= 0); + DUK_ASSERT((duk_uint32_t) n <= DUK_UINT32_MAX); + if (DUK_UNLIKELY(len + (duk_uint32_t) n < len)) { + DUK_D(DUK_DPRINT("Array.prototype.push() would go beyond 32-bit length, throw")); + DUK_DCERROR_RANGE_INVALID_LENGTH(thr); /* != 0 return value returned as is by caller */ + } + if (len + (duk_uint32_t) n > DUK_HOBJECT_GET_ASIZE((duk_hobject *) h_arr)) { + /* Array part would need to be extended. Rely on slow path + * for now. + * + * XXX: Rework hobject code a bit and add extend support. + */ + return 0; + } + + tv_src = thr->valstack_bottom; + tv_dst = tv_arraypart + len; + for (i = 0; i < n; i++) { + /* No net refcount change; reset value stack values to + * undefined to satisfy value stack init policy. + */ + DUK_TVAL_SET_TVAL(tv_dst, tv_src); + DUK_TVAL_SET_UNDEFINED(tv_src); + tv_src++; + tv_dst++; + } + thr->valstack_top = thr->valstack_bottom; + len += (duk_uint32_t) n; + h_arr->length = len; + + DUK_ASSERT((duk_uint_t) len == len); + duk_push_uint(thr, (duk_uint_t) len); + return 1; +} +#endif /* DUK_USE_ARRAY_FASTPATH */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_push(duk_hthread *thr) { + /* Note: 'this' is not necessarily an Array object. The push() + * algorithm is supposed to work for other kinds of objects too, + * so the algorithm has e.g. an explicit update for the 'length' + * property which is normally "magical" in arrays. + */ + + duk_uint32_t len; + duk_idx_t i, n; +#if defined(DUK_USE_ARRAY_FASTPATH) + duk_harray *h_arr; +#endif + +#if defined(DUK_USE_ARRAY_FASTPATH) + h_arr = duk__arraypart_fastpath_this(thr); + if (h_arr) { + duk_ret_t rc; + rc = duk__array_push_fastpath(thr, h_arr); + if (rc != 0) { + return rc; + } + DUK_DD(DUK_DDPRINT("array push() fast path exited, resize case")); + } +#endif + + n = duk_get_top(thr); + len = duk__push_this_obj_len_u32(thr); + + /* [ arg1 ... argN obj length ] */ + + /* Technically Array.prototype.push() can create an Array with length + * longer than 2^32-1, i.e. outside the 32-bit range. The final length + * is *not* wrapped to 32 bits in the specification. + * + * This implementation tracks length with a uint32 because it's much + * more practical. + * + * See: test-bi-array-push-maxlen.js. + */ + + if (len + (duk_uint32_t) n < len) { + DUK_D(DUK_DPRINT("Array.prototype.push() would go beyond 32-bit length, throw")); + DUK_DCERROR_RANGE_INVALID_LENGTH(thr); + } + + for (i = 0; i < n; i++) { + duk_dup(thr, i); + duk_put_prop_index(thr, -3, (duk_uarridx_t) (len + (duk_uint32_t) i)); + } + len += (duk_uint32_t) n; + + duk_push_u32(thr, len); + duk_dup_top(thr); + duk_put_prop_stridx_short(thr, -4, DUK_STRIDX_LENGTH); + + /* [ arg1 ... argN obj length new_length ] */ + return 1; +} + +/* + * sort() + * + * Currently qsort with random pivot. This is now really, really slow, + * because there is no fast path for array parts. + * + * Signed indices are used because qsort() leaves and degenerate cases + * may use a negative offset. + */ + +DUK_LOCAL duk_small_int_t duk__array_sort_compare(duk_hthread *thr, duk_int_t idx1, duk_int_t idx2) { + duk_bool_t have1, have2; + duk_bool_t undef1, undef2; + duk_small_int_t ret; + duk_idx_t idx_obj = 1; /* fixed offsets in valstack */ + duk_idx_t idx_fn = 0; + duk_hstring *h1, *h2; + + /* Fast exit if indices are identical. This is valid for a non-existent property, + * for an undefined value, and almost always for ToString() coerced comparison of + * arbitrary values (corner cases where this is not the case include e.g. a an + * object with varying ToString() coercion). + * + * The specification does not prohibit "caching" of values read from the array, so + * assuming equality for comparing an index with itself falls into the category of + * "caching". + * + * Also, compareFn may be inconsistent, so skipping a call to compareFn here may + * have an effect on the final result. The specification does not require any + * specific behavior for inconsistent compare functions, so again, this fast path + * is OK. + */ + + if (idx1 == idx2) { + DUK_DDD(DUK_DDDPRINT("duk__array_sort_compare: idx1=%ld, idx2=%ld -> indices identical, quick exit", + (long) idx1, (long) idx2)); + return 0; + } + + have1 = duk_get_prop_index(thr, idx_obj, (duk_uarridx_t) idx1); + have2 = duk_get_prop_index(thr, idx_obj, (duk_uarridx_t) idx2); + + DUK_DDD(DUK_DDDPRINT("duk__array_sort_compare: idx1=%ld, idx2=%ld, have1=%ld, have2=%ld, val1=%!T, val2=%!T", + (long) idx1, (long) idx2, (long) have1, (long) have2, + (duk_tval *) duk_get_tval(thr, -2), (duk_tval *) duk_get_tval(thr, -1))); + + if (have1) { + if (have2) { + ; + } else { + ret = -1; + goto pop_ret; + } + } else { + if (have2) { + ret = 1; + goto pop_ret; + } else { + ret = 0; + goto pop_ret; + } + } + + undef1 = duk_is_undefined(thr, -2); + undef2 = duk_is_undefined(thr, -1); + if (undef1) { + if (undef2) { + ret = 0; + goto pop_ret; + } else { + ret = 1; + goto pop_ret; + } + } else { + if (undef2) { + ret = -1; + goto pop_ret; + } else { + ; + } + } + + if (!duk_is_undefined(thr, idx_fn)) { + duk_double_t d; + + /* No need to check callable; duk_call() will do that. */ + duk_dup(thr, idx_fn); /* -> [ ... x y fn ] */ + duk_insert(thr, -3); /* -> [ ... fn x y ] */ + duk_call(thr, 2); /* -> [ ... res ] */ + + /* ES5 is a bit vague about what to do if the return value is + * not a number. ES2015 provides a concrete description: + * http://www.ecma-international.org/ecma-262/6.0/#sec-sortcompare. + */ + + d = duk_to_number_m1(thr); + if (d < 0.0) { + ret = -1; + } else if (d > 0.0) { + ret = 1; + } else { + /* Because NaN compares to false, NaN is handled here + * without an explicit check above. + */ + ret = 0; + } + + duk_pop_nodecref_unsafe(thr); + DUK_DDD(DUK_DDDPRINT("-> result %ld (from comparefn, after coercion)", (long) ret)); + return ret; + } + + /* string compare is the default (a bit oddly) */ + + /* XXX: any special handling for plain array; causes repeated coercion now? */ + h1 = duk_to_hstring(thr, -2); + h2 = duk_to_hstring_m1(thr); + DUK_ASSERT(h1 != NULL); + DUK_ASSERT(h2 != NULL); + + ret = duk_js_string_compare(h1, h2); /* retval is directly usable */ + goto pop_ret; + + pop_ret: + duk_pop_2_unsafe(thr); + DUK_DDD(DUK_DDDPRINT("-> result %ld", (long) ret)); + return ret; +} + +DUK_LOCAL void duk__array_sort_swap(duk_hthread *thr, duk_int_t l, duk_int_t r) { + duk_bool_t have_l, have_r; + duk_idx_t idx_obj = 1; /* fixed offset in valstack */ + + if (l == r) { + return; + } + + /* swap elements; deal with non-existent elements correctly */ + have_l = duk_get_prop_index(thr, idx_obj, (duk_uarridx_t) l); + have_r = duk_get_prop_index(thr, idx_obj, (duk_uarridx_t) r); + + if (have_r) { + /* right exists, [[Put]] regardless whether or not left exists */ + duk_put_prop_index(thr, idx_obj, (duk_uarridx_t) l); + } else { + duk_del_prop_index(thr, idx_obj, (duk_uarridx_t) l); + duk_pop_undefined(thr); + } + + if (have_l) { + duk_put_prop_index(thr, idx_obj, (duk_uarridx_t) r); + } else { + duk_del_prop_index(thr, idx_obj, (duk_uarridx_t) r); + duk_pop_undefined(thr); + } +} + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) +/* Debug print which visualizes the qsort partitioning process. */ +DUK_LOCAL void duk__debuglog_qsort_state(duk_hthread *thr, duk_int_t lo, duk_int_t hi, duk_int_t pivot) { + char buf[4096]; + char *ptr = buf; + duk_int_t i, n; + n = (duk_int_t) duk_get_length(thr, 1); + if (n > 4000) { + n = 4000; + } + *ptr++ = '['; + for (i = 0; i < n; i++) { + if (i == pivot) { + *ptr++ = '|'; + } else if (i == lo) { + *ptr++ = '<'; + } else if (i == hi) { + *ptr++ = '>'; + } else if (i >= lo && i <= hi) { + *ptr++ = '-'; + } else { + *ptr++ = ' '; + } + } + *ptr++ = ']'; + *ptr++ = '\0'; + + DUK_DDD(DUK_DDDPRINT("%s (lo=%ld, hi=%ld, pivot=%ld)", + (const char *) buf, (long) lo, (long) hi, (long) pivot)); +} +#endif + +DUK_LOCAL void duk__array_qsort(duk_hthread *thr, duk_int_t lo, duk_int_t hi) { + duk_int_t p, l, r; + + /* The lo/hi indices may be crossed and hi < 0 is possible at entry. */ + + DUK_DDD(DUK_DDDPRINT("duk__array_qsort: lo=%ld, hi=%ld, obj=%!T", + (long) lo, (long) hi, (duk_tval *) duk_get_tval(thr, 1))); + + DUK_ASSERT_TOP(thr, 3); + + /* In some cases it may be that lo > hi, or hi < 0; these + * degenerate cases happen e.g. for empty arrays, and in + * recursion leaves. + */ + + /* trivial cases */ + if (hi - lo < 1) { + DUK_DDD(DUK_DDDPRINT("degenerate case, return immediately")); + return; + } + DUK_ASSERT(hi > lo); + DUK_ASSERT(hi - lo + 1 >= 2); + + /* randomized pivot selection */ + p = lo + (duk_int_t) (DUK_UTIL_GET_RANDOM_DOUBLE(thr) * (duk_double_t) (hi - lo + 1)); + DUK_ASSERT(p >= lo && p <= hi); + DUK_DDD(DUK_DDDPRINT("lo=%ld, hi=%ld, chose pivot p=%ld", (long) lo, (long) hi, (long) p)); + + /* move pivot out of the way */ + duk__array_sort_swap(thr, p, lo); + p = lo; + DUK_DDD(DUK_DDDPRINT("pivot moved out of the way: %!T", (duk_tval *) duk_get_tval(thr, 1))); + + l = lo + 1; + r = hi; + for (;;) { + /* find elements to swap */ + for (;;) { + DUK_DDD(DUK_DDDPRINT("left scan: l=%ld, r=%ld, p=%ld", + (long) l, (long) r, (long) p)); + if (l >= hi) { + break; + } + if (duk__array_sort_compare(thr, l, p) >= 0) { /* !(l < p) */ + break; + } + l++; + } + for (;;) { + DUK_DDD(DUK_DDDPRINT("right scan: l=%ld, r=%ld, p=%ld", + (long) l, (long) r, (long) p)); + if (r <= lo) { + break; + } + if (duk__array_sort_compare(thr, p, r) >= 0) { /* !(p < r) */ + break; + } + r--; + } + if (l >= r) { + goto done; + } + DUK_ASSERT(l < r); + + DUK_DDD(DUK_DDDPRINT("swap %ld and %ld", (long) l, (long) r)); + + duk__array_sort_swap(thr, l, r); + + DUK_DDD(DUK_DDDPRINT("after swap: %!T", (duk_tval *) duk_get_tval(thr, 1))); + l++; + r--; + } + done: + /* Note that 'l' and 'r' may cross, i.e. r < l */ + DUK_ASSERT(l >= lo && l <= hi); + DUK_ASSERT(r >= lo && r <= hi); + + /* XXX: there's no explicit recursion bound here now. For the average + * qsort recursion depth O(log n) that's not really necessary: e.g. for + * 2**32 recursion depth would be about 32 which is OK. However, qsort + * worst case recursion depth is O(n) which may be a problem. + */ + + /* move pivot to its final place */ + DUK_DDD(DUK_DDDPRINT("before final pivot swap: %!T", (duk_tval *) duk_get_tval(thr, 1))); + duk__array_sort_swap(thr, lo, r); + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + duk__debuglog_qsort_state(thr, lo, hi, r); +#endif + + DUK_DDD(DUK_DDDPRINT("recurse: pivot=%ld, obj=%!T", (long) r, (duk_tval *) duk_get_tval(thr, 1))); + duk__array_qsort(thr, lo, r - 1); + duk__array_qsort(thr, r + 1, hi); +} + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_sort(duk_hthread *thr) { + duk_uint32_t len; + + /* XXX: len >= 0x80000000 won't work below because a signed type + * is needed by qsort. + */ + len = duk__push_this_obj_len_u32_limited(thr); + + /* stack[0] = compareFn + * stack[1] = ToObject(this) + * stack[2] = ToUint32(length) + */ + + if (len > 0) { + /* avoid degenerate cases, so that (len - 1) won't underflow */ + duk__array_qsort(thr, (duk_int_t) 0, (duk_int_t) (len - 1)); + } + + DUK_ASSERT_TOP(thr, 3); + duk_pop_nodecref_unsafe(thr); + return 1; /* return ToObject(this) */ +} + +/* + * splice() + */ + +/* XXX: this compiles to over 500 bytes now, even without special handling + * for an array part. Uses signed ints so does not handle full array range correctly. + */ + +/* XXX: can shift() / unshift() use the same helper? + * shift() is (close to?) <--> splice(0, 1) + * unshift is (close to?) <--> splice(0, 0, [items])? + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_splice(duk_hthread *thr) { + duk_idx_t nargs; + duk_uint32_t len_u32; + duk_int_t len; + duk_bool_t have_delcount; + duk_int_t item_count; + duk_int_t act_start; + duk_int_t del_count; + duk_int_t i, n; + + DUK_UNREF(have_delcount); + + nargs = duk_get_top(thr); + if (nargs < 2) { + duk_set_top(thr, 2); + nargs = 2; + have_delcount = 0; + } else { + have_delcount = 1; + } + + /* XXX: len >= 0x80000000 won't work below because we need to be + * able to represent -len. + */ + len_u32 = duk__push_this_obj_len_u32_limited(thr); + len = (duk_int_t) len_u32; + DUK_ASSERT(len >= 0); + + act_start = duk_to_int_clamped(thr, 0, -len, len); + if (act_start < 0) { + act_start = len + act_start; + } + DUK_ASSERT(act_start >= 0 && act_start <= len); + +#if defined(DUK_USE_NONSTD_ARRAY_SPLICE_DELCOUNT) + if (have_delcount) { +#endif + del_count = duk_to_int_clamped(thr, 1, 0, len - act_start); +#if defined(DUK_USE_NONSTD_ARRAY_SPLICE_DELCOUNT) + } else { + /* E5.1 standard behavior when deleteCount is not given would be + * to treat it just like if 'undefined' was given, which coerces + * ultimately to 0. Real world behavior is to splice to the end + * of array, see test-bi-array-proto-splice-no-delcount.js. + */ + del_count = len - act_start; + } +#endif + + DUK_ASSERT(nargs >= 2); + item_count = (duk_int_t) (nargs - 2); + + DUK_ASSERT(del_count >= 0 && del_count <= len - act_start); + DUK_ASSERT(del_count + act_start <= len); + + /* For now, restrict result array into 32-bit length range. */ + if (((duk_double_t) len) - ((duk_double_t) del_count) + ((duk_double_t) item_count) > (duk_double_t) DUK_UINT32_MAX) { + DUK_D(DUK_DPRINT("Array.prototype.splice() would go beyond 32-bit length, throw")); + DUK_DCERROR_RANGE_INVALID_LENGTH(thr); + } + + duk_push_array(thr); + + /* stack[0] = start + * stack[1] = deleteCount + * stack[2...nargs-1] = items + * stack[nargs] = ToObject(this) -3 + * stack[nargs+1] = ToUint32(length) -2 + * stack[nargs+2] = result array -1 + */ + + DUK_ASSERT_TOP(thr, nargs + 3); + + /* Step 9: copy elements-to-be-deleted into the result array */ + + for (i = 0; i < del_count; i++) { + if (duk_get_prop_index(thr, -3, (duk_uarridx_t) (act_start + i))) { + duk_xdef_prop_index_wec(thr, -2, (duk_uarridx_t) i); /* throw flag irrelevant (false in std alg) */ + } else { + duk_pop_undefined(thr); + } + } + duk_push_u32(thr, (duk_uint32_t) del_count); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_W); + + /* Steps 12 and 13: reorganize elements to make room for itemCount elements */ + + if (item_count < del_count) { + /* [ A B C D E F G H ] rel_index = 2, del_count 3, item count 1 + * -> [ A B F G H ] (conceptual intermediate step) + * -> [ A B . F G H ] (placeholder marked) + * [ A B C F G H ] (actual result at this point, C will be replaced) + */ + + DUK_ASSERT_TOP(thr, nargs + 3); + + n = len - del_count; + for (i = act_start; i < n; i++) { + if (duk_get_prop_index(thr, -3, (duk_uarridx_t) (i + del_count))) { + duk_put_prop_index(thr, -4, (duk_uarridx_t) (i + item_count)); + } else { + duk_pop_undefined(thr); + duk_del_prop_index(thr, -3, (duk_uarridx_t) (i + item_count)); + } + } + + DUK_ASSERT_TOP(thr, nargs + 3); + + /* loop iterator init and limit changed from standard algorithm */ + n = len - del_count + item_count; + for (i = len - 1; i >= n; i--) { + duk_del_prop_index(thr, -3, (duk_uarridx_t) i); + } + + DUK_ASSERT_TOP(thr, nargs + 3); + } else if (item_count > del_count) { + /* [ A B C D E F G H ] rel_index = 2, del_count 3, item count 4 + * -> [ A B F G H ] (conceptual intermediate step) + * -> [ A B . . . . F G H ] (placeholder marked) + * [ A B C D E F F G H ] (actual result at this point) + */ + + DUK_ASSERT_TOP(thr, nargs + 3); + + /* loop iterator init and limit changed from standard algorithm */ + for (i = len - del_count - 1; i >= act_start; i--) { + if (duk_get_prop_index(thr, -3, (duk_uarridx_t) (i + del_count))) { + duk_put_prop_index(thr, -4, (duk_uarridx_t) (i + item_count)); + } else { + duk_pop_undefined(thr); + duk_del_prop_index(thr, -3, (duk_uarridx_t) (i + item_count)); + } + } + + DUK_ASSERT_TOP(thr, nargs + 3); + } else { + /* [ A B C D E F G H ] rel_index = 2, del_count 3, item count 3 + * -> [ A B F G H ] (conceptual intermediate step) + * -> [ A B . . . F G H ] (placeholder marked) + * [ A B C D E F G H ] (actual result at this point) + */ + } + DUK_ASSERT_TOP(thr, nargs + 3); + + /* Step 15: insert itemCount elements into the hole made above */ + + for (i = 0; i < item_count; i++) { + duk_dup(thr, i + 2); /* args start at index 2 */ + duk_put_prop_index(thr, -4, (duk_uarridx_t) (act_start + i)); + } + + /* Step 16: update length; note that the final length may be above 32 bit range + * (but we checked above that this isn't the case here) + */ + + duk_push_u32(thr, (duk_uint32_t) (len - del_count + item_count)); + duk_put_prop_stridx_short(thr, -4, DUK_STRIDX_LENGTH); + + /* result array is already at the top of stack */ + DUK_ASSERT_TOP(thr, nargs + 3); + return 1; +} + +/* + * reverse() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_reverse(duk_hthread *thr) { + duk_uint32_t len; + duk_uint32_t middle; + duk_uint32_t lower, upper; + duk_bool_t have_lower, have_upper; + + len = duk__push_this_obj_len_u32(thr); + middle = len / 2; + + /* If len <= 1, middle will be 0 and for-loop bails out + * immediately (0 < 0 -> false). + */ + + for (lower = 0; lower < middle; lower++) { + DUK_ASSERT(len >= 2); + DUK_ASSERT_TOP(thr, 2); + + DUK_ASSERT(len >= lower + 1); + upper = len - lower - 1; + + have_lower = duk_get_prop_index(thr, -2, (duk_uarridx_t) lower); + have_upper = duk_get_prop_index(thr, -3, (duk_uarridx_t) upper); + + /* [ ToObject(this) ToUint32(length) lowerValue upperValue ] */ + + if (have_upper) { + duk_put_prop_index(thr, -4, (duk_uarridx_t) lower); + } else { + duk_del_prop_index(thr, -4, (duk_uarridx_t) lower); + duk_pop_undefined(thr); + } + + if (have_lower) { + duk_put_prop_index(thr, -3, (duk_uarridx_t) upper); + } else { + duk_del_prop_index(thr, -3, (duk_uarridx_t) upper); + duk_pop_undefined(thr); + } + + DUK_ASSERT_TOP(thr, 2); + } + + DUK_ASSERT_TOP(thr, 2); + duk_pop_unsafe(thr); /* -> [ ToObject(this) ] */ + return 1; +} + +/* + * slice() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_slice(duk_hthread *thr) { + duk_uint32_t len_u32; + duk_int_t len; + duk_int_t start, end; + duk_int_t i; + duk_uarridx_t idx; + duk_uint32_t res_length = 0; + + /* XXX: len >= 0x80000000 won't work below because we need to be + * able to represent -len. + */ + len_u32 = duk__push_this_obj_len_u32_limited(thr); + len = (duk_int_t) len_u32; + DUK_ASSERT(len >= 0); + + duk_push_array(thr); + + /* stack[0] = start + * stack[1] = end + * stack[2] = ToObject(this) + * stack[3] = ToUint32(length) + * stack[4] = result array + */ + + start = duk_to_int_clamped(thr, 0, -len, len); + if (start < 0) { + start = len + start; + } + /* XXX: could duk_is_undefined() provide defaulting undefined to 'len' + * (the upper limit)? + */ + if (duk_is_undefined(thr, 1)) { + end = len; + } else { + end = duk_to_int_clamped(thr, 1, -len, len); + if (end < 0) { + end = len + end; + } + } + DUK_ASSERT(start >= 0 && start <= len); + DUK_ASSERT(end >= 0 && end <= len); + + idx = 0; + for (i = start; i < end; i++) { + DUK_ASSERT_TOP(thr, 5); + if (duk_get_prop_index(thr, 2, (duk_uarridx_t) i)) { + duk_xdef_prop_index_wec(thr, 4, idx); + res_length = idx + 1; + } else { + duk_pop_undefined(thr); + } + idx++; + DUK_ASSERT_TOP(thr, 5); + } + + duk_push_u32(thr, res_length); + duk_xdef_prop_stridx_short(thr, 4, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_W); + + DUK_ASSERT_TOP(thr, 5); + return 1; +} + +/* + * shift() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_shift(duk_hthread *thr) { + duk_uint32_t len; + duk_uint32_t i; + + len = duk__push_this_obj_len_u32(thr); + if (len == 0) { + duk_push_int(thr, 0); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LENGTH); + return 0; + } + + duk_get_prop_index(thr, 0, 0); + + /* stack[0] = object (this) + * stack[1] = ToUint32(length) + * stack[2] = elem at index 0 (retval) + */ + + for (i = 1; i < len; i++) { + DUK_ASSERT_TOP(thr, 3); + if (duk_get_prop_index(thr, 0, (duk_uarridx_t) i)) { + /* fromPresent = true */ + duk_put_prop_index(thr, 0, (duk_uarridx_t) (i - 1)); + } else { + /* fromPresent = false */ + duk_del_prop_index(thr, 0, (duk_uarridx_t) (i - 1)); + duk_pop_undefined(thr); + } + } + duk_del_prop_index(thr, 0, (duk_uarridx_t) (len - 1)); + + duk_push_u32(thr, (duk_uint32_t) (len - 1)); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LENGTH); + + DUK_ASSERT_TOP(thr, 3); + return 1; +} + +/* + * unshift() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_unshift(duk_hthread *thr) { + duk_idx_t nargs; + duk_uint32_t len; + duk_uint32_t i; + + nargs = duk_get_top(thr); + len = duk__push_this_obj_len_u32(thr); + + /* stack[0...nargs-1] = unshift args (vararg) + * stack[nargs] = ToObject(this) + * stack[nargs+1] = ToUint32(length) + */ + + DUK_ASSERT_TOP(thr, nargs + 2); + + /* Note: unshift() may operate on indices above unsigned 32-bit range + * and the final length may be >= 2**32. However, we restrict the + * final result to 32-bit range for practicality. + */ + + if (len + (duk_uint32_t) nargs < len) { + DUK_D(DUK_DPRINT("Array.prototype.unshift() would go beyond 32-bit length, throw")); + DUK_DCERROR_RANGE_INVALID_LENGTH(thr); + } + + i = len; + while (i > 0) { + DUK_ASSERT_TOP(thr, nargs + 2); + i--; + /* k+argCount-1; note that may be above 32-bit range */ + + if (duk_get_prop_index(thr, -2, (duk_uarridx_t) i)) { + /* fromPresent = true */ + /* [ ... ToObject(this) ToUint32(length) val ] */ + duk_put_prop_index(thr, -3, (duk_uarridx_t) (i + (duk_uint32_t) nargs)); /* -> [ ... ToObject(this) ToUint32(length) ] */ + } else { + /* fromPresent = false */ + /* [ ... ToObject(this) ToUint32(length) val ] */ + duk_pop_undefined(thr); + duk_del_prop_index(thr, -2, (duk_uarridx_t) (i + (duk_uint32_t) nargs)); /* -> [ ... ToObject(this) ToUint32(length) ] */ + } + DUK_ASSERT_TOP(thr, nargs + 2); + } + + for (i = 0; i < (duk_uint32_t) nargs; i++) { + DUK_ASSERT_TOP(thr, nargs + 2); + duk_dup(thr, (duk_idx_t) i); /* -> [ ... ToObject(this) ToUint32(length) arg[i] ] */ + duk_put_prop_index(thr, -3, (duk_uarridx_t) i); + DUK_ASSERT_TOP(thr, nargs + 2); + } + + DUK_ASSERT_TOP(thr, nargs + 2); + duk_push_u32(thr, len + (duk_uint32_t) nargs); + duk_dup_top(thr); /* -> [ ... ToObject(this) ToUint32(length) final_len final_len ] */ + duk_put_prop_stridx_short(thr, -4, DUK_STRIDX_LENGTH); + return 1; +} + +/* + * indexOf(), lastIndexOf() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_indexof_shared(duk_hthread *thr) { + duk_idx_t nargs; + duk_int_t i, len; + duk_int_t from_idx; + duk_small_int_t idx_step = duk_get_current_magic(thr); /* idx_step is +1 for indexOf, -1 for lastIndexOf */ + + /* lastIndexOf() needs to be a vararg function because we must distinguish + * between an undefined fromIndex and a "not given" fromIndex; indexOf() is + * made vararg for symmetry although it doesn't strictly need to be. + */ + + nargs = duk_get_top(thr); + duk_set_top(thr, 2); + + /* XXX: must be able to represent -len */ + len = (duk_int_t) duk__push_this_obj_len_u32_limited(thr); + if (len == 0) { + goto not_found; + } + + /* Index clamping is a bit tricky, we must ensure that we'll only iterate + * through elements that exist and that the specific requirements from E5.1 + * Sections 15.4.4.14 and 15.4.4.15 are fulfilled; especially: + * + * - indexOf: clamp to [-len,len], negative handling -> [0,len], + * if clamped result is len, for-loop bails out immediately + * + * - lastIndexOf: clamp to [-len-1, len-1], negative handling -> [-1, len-1], + * if clamped result is -1, for-loop bails out immediately + * + * If fromIndex is not given, ToInteger(undefined) = 0, which is correct + * for indexOf() but incorrect for lastIndexOf(). Hence special handling, + * and why lastIndexOf() needs to be a vararg function. + */ + + if (nargs >= 2) { + /* indexOf: clamp fromIndex to [-len, len] + * (if fromIndex == len, for-loop terminates directly) + * + * lastIndexOf: clamp fromIndex to [-len - 1, len - 1] + * (if clamped to -len-1 -> fromIndex becomes -1, terminates for-loop directly) + */ + from_idx = duk_to_int_clamped(thr, + 1, + (idx_step > 0 ? -len : -len - 1), + (idx_step > 0 ? len : len - 1)); + if (from_idx < 0) { + /* for lastIndexOf, result may be -1 (mark immediate termination) */ + from_idx = len + from_idx; + } + } else { + /* for indexOf, ToInteger(undefined) would be 0, i.e. correct, but + * handle both indexOf and lastIndexOf specially here. + */ + if (idx_step > 0) { + from_idx = 0; + } else { + from_idx = len - 1; + } + } + + /* stack[0] = searchElement + * stack[1] = fromIndex + * stack[2] = object + * stack[3] = length (not needed, but not popped above) + */ + + for (i = from_idx; i >= 0 && i < len; i += idx_step) { + DUK_ASSERT_TOP(thr, 4); + + if (duk_get_prop_index(thr, 2, (duk_uarridx_t) i)) { + DUK_ASSERT_TOP(thr, 5); + if (duk_strict_equals(thr, 0, 4)) { + duk_push_int(thr, i); + return 1; + } + } + + duk_pop_unsafe(thr); + } + + not_found: + duk_push_int(thr, -1); + return 1; +} + +/* + * every(), some(), forEach(), map(), filter() + */ + +#define DUK__ITER_EVERY 0 +#define DUK__ITER_SOME 1 +#define DUK__ITER_FOREACH 2 +#define DUK__ITER_MAP 3 +#define DUK__ITER_FILTER 4 + +/* XXX: This helper is a bit awkward because the handling for the different iteration + * callers is quite different. This now compiles to a bit less than 500 bytes, so with + * 5 callers the net result is about 100 bytes / caller. + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_iter_shared(duk_hthread *thr) { + duk_uint32_t len; + duk_uint32_t i; + duk_uarridx_t k; + duk_bool_t bval; + duk_small_int_t iter_type = duk_get_current_magic(thr); + duk_uint32_t res_length = 0; + + /* each call this helper serves has nargs==2 */ + DUK_ASSERT_TOP(thr, 2); + + len = duk__push_this_obj_len_u32(thr); + duk_require_callable(thr, 0); + /* if thisArg not supplied, behave as if undefined was supplied */ + + if (iter_type == DUK__ITER_MAP || iter_type == DUK__ITER_FILTER) { + duk_push_array(thr); + } else { + duk_push_undefined(thr); + } + + /* stack[0] = callback + * stack[1] = thisArg + * stack[2] = object + * stack[3] = ToUint32(length) (unused, but avoid unnecessary pop) + * stack[4] = result array (or undefined) + */ + + k = 0; /* result index for filter() */ + for (i = 0; i < len; i++) { + DUK_ASSERT_TOP(thr, 5); + + if (!duk_get_prop_index(thr, 2, (duk_uarridx_t) i)) { + /* For 'map' trailing missing elements don't invoke the + * callback but count towards the result length. + */ + if (iter_type == DUK__ITER_MAP) { + res_length = i + 1; + } + duk_pop_undefined(thr); + continue; + } + + /* The original value needs to be preserved for filter(), hence + * this funny order. We can't re-get the value because of side + * effects. + */ + + duk_dup_0(thr); + duk_dup_1(thr); + duk_dup_m3(thr); + duk_push_u32(thr, i); + duk_dup_2(thr); /* [ ... val callback thisArg val i obj ] */ + duk_call_method(thr, 3); /* -> [ ... val retval ] */ + + switch (iter_type) { + case DUK__ITER_EVERY: + bval = duk_to_boolean(thr, -1); + if (!bval) { + /* stack top contains 'false' */ + return 1; + } + break; + case DUK__ITER_SOME: + bval = duk_to_boolean(thr, -1); + if (bval) { + /* stack top contains 'true' */ + return 1; + } + break; + case DUK__ITER_FOREACH: + /* nop */ + break; + case DUK__ITER_MAP: + duk_dup_top(thr); + duk_xdef_prop_index_wec(thr, 4, (duk_uarridx_t) i); /* retval to result[i] */ + res_length = i + 1; + break; + case DUK__ITER_FILTER: + bval = duk_to_boolean(thr, -1); + if (bval) { + duk_dup_m2(thr); /* orig value */ + duk_xdef_prop_index_wec(thr, 4, (duk_uarridx_t) k); + k++; + res_length = k; + } + break; + default: + DUK_UNREACHABLE(); + break; + } + duk_pop_2_unsafe(thr); + + DUK_ASSERT_TOP(thr, 5); + } + + switch (iter_type) { + case DUK__ITER_EVERY: + duk_push_true(thr); + break; + case DUK__ITER_SOME: + duk_push_false(thr); + break; + case DUK__ITER_FOREACH: + duk_push_undefined(thr); + break; + case DUK__ITER_MAP: + case DUK__ITER_FILTER: + DUK_ASSERT_TOP(thr, 5); + DUK_ASSERT(duk_is_array(thr, -1)); /* topmost element is the result array already */ + duk_push_u32(thr, res_length); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_W); + break; + default: + DUK_UNREACHABLE(); + break; + } + + return 1; +} + +/* + * reduce(), reduceRight() + */ + +DUK_INTERNAL duk_ret_t duk_bi_array_prototype_reduce_shared(duk_hthread *thr) { + duk_idx_t nargs; + duk_bool_t have_acc; + duk_uint32_t i, len; + duk_small_int_t idx_step = duk_get_current_magic(thr); /* idx_step is +1 for reduce, -1 for reduceRight */ + + /* We're a varargs function because we need to detect whether + * initialValue was given or not. + */ + nargs = duk_get_top(thr); + DUK_DDD(DUK_DDDPRINT("nargs=%ld", (long) nargs)); + + duk_set_top(thr, 2); + len = duk__push_this_obj_len_u32(thr); + duk_require_callable(thr, 0); + + /* stack[0] = callback fn + * stack[1] = initialValue + * stack[2] = object (coerced this) + * stack[3] = length (not needed, but not popped above) + * stack[4] = accumulator + */ + + have_acc = 0; + if (nargs >= 2) { + duk_dup_1(thr); + have_acc = 1; + } + DUK_DDD(DUK_DDDPRINT("have_acc=%ld, acc=%!T", + (long) have_acc, (duk_tval *) duk_get_tval(thr, 3))); + + /* For len == 0, i is initialized to len - 1 which underflows. + * The condition (i < len) will then exit the for-loop on the + * first round which is correct. Similarly, loop termination + * happens by i underflowing. + */ + + for (i = (idx_step >= 0 ? 0 : len - 1); + i < len; /* i >= 0 would always be true */ + i += (duk_uint32_t) idx_step) { + DUK_DDD(DUK_DDDPRINT("i=%ld, len=%ld, have_acc=%ld, top=%ld, acc=%!T", + (long) i, (long) len, (long) have_acc, + (long) duk_get_top(thr), + (duk_tval *) duk_get_tval(thr, 4))); + + DUK_ASSERT((have_acc && duk_get_top(thr) == 5) || + (!have_acc && duk_get_top(thr) == 4)); + + if (!duk_has_prop_index(thr, 2, (duk_uarridx_t) i)) { + continue; + } + + if (!have_acc) { + DUK_ASSERT_TOP(thr, 4); + duk_get_prop_index(thr, 2, (duk_uarridx_t) i); + have_acc = 1; + DUK_ASSERT_TOP(thr, 5); + } else { + DUK_ASSERT_TOP(thr, 5); + duk_dup_0(thr); + duk_dup(thr, 4); + duk_get_prop_index(thr, 2, (duk_uarridx_t) i); + duk_push_u32(thr, i); + duk_dup_2(thr); + DUK_DDD(DUK_DDDPRINT("calling reduce function: func=%!T, prev=%!T, curr=%!T, idx=%!T, obj=%!T", + (duk_tval *) duk_get_tval(thr, -5), (duk_tval *) duk_get_tval(thr, -4), + (duk_tval *) duk_get_tval(thr, -3), (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + duk_call(thr, 4); + DUK_DDD(DUK_DDDPRINT("-> result: %!T", (duk_tval *) duk_get_tval(thr, -1))); + duk_replace(thr, 4); + DUK_ASSERT_TOP(thr, 5); + } + } + + if (!have_acc) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + DUK_ASSERT_TOP(thr, 5); + return 1; +} + +#endif /* DUK_USE_ARRAY_BUILTIN */ + +/* automatic undefs */ +#undef DUK__ARRAY_MID_JOIN_LIMIT +#undef DUK__ITER_EVERY +#undef DUK__ITER_FILTER +#undef DUK__ITER_FOREACH +#undef DUK__ITER_MAP +#undef DUK__ITER_SOME +#line 1 "duk_bi_boolean.c" +/* + * Boolean built-ins + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_BOOLEAN_BUILTIN) + +/* Shared helper to provide toString() and valueOf(). Checks 'this', gets + * the primitive value to stack top, and optionally coerces with ToString(). + */ +DUK_INTERNAL duk_ret_t duk_bi_boolean_prototype_tostring_shared(duk_hthread *thr) { + duk_tval *tv; + duk_hobject *h; + duk_small_int_t coerce_tostring = duk_get_current_magic(thr); + + /* XXX: there is room to use a shared helper here, many built-ins + * check the 'this' type, and if it's an object, check its class, + * then get its internal value, etc. + */ + + duk_push_this(thr); + tv = duk_get_tval(thr, -1); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_BOOLEAN(tv)) { + goto type_ok; + } else if (DUK_TVAL_IS_OBJECT(tv)) { + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_BOOLEAN) { + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE); + DUK_ASSERT(duk_is_boolean(thr, -1)); + goto type_ok; + } + } + + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + /* never here */ + + type_ok: + if (coerce_tostring) { + duk_to_string(thr, -1); + } + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_boolean_constructor(duk_hthread *thr) { + duk_hobject *h_this; + + duk_to_boolean(thr, 0); + + if (duk_is_constructor_call(thr)) { + /* XXX: helper; rely on Boolean.prototype as being non-writable, non-configurable */ + duk_push_this(thr); + h_this = duk_known_hobject(thr, -1); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_this) == thr->builtins[DUK_BIDX_BOOLEAN_PROTOTYPE]); + + DUK_HOBJECT_SET_CLASS_NUMBER(h_this, DUK_HOBJECT_CLASS_BOOLEAN); + + duk_dup_0(thr); /* -> [ val obj val ] */ + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE); /* XXX: proper flags? */ + } /* unbalanced stack */ + + return 1; +} + +#endif /* DUK_USE_BOOLEAN_BUILTIN */ +#line 1 "duk_bi_buffer.c" +/* + * ES2015 TypedArray and Node.js Buffer built-ins + */ + +/* #include duk_internal.h -> already included */ + +/* + * Helpers for buffer handling, enabled with DUK_USE_BUFFEROBJECT_SUPPORT. + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +/* Map class number (minus DUK_HOBJECT_CLASS_BUFOBJ_MIN) to a bidx for the + * default internal prototype. + */ +static const duk_uint8_t duk__buffer_proto_from_classnum[] = { + DUK_BIDX_ARRAYBUFFER_PROTOTYPE, + DUK_BIDX_DATAVIEW_PROTOTYPE, + DUK_BIDX_INT8ARRAY_PROTOTYPE, + DUK_BIDX_UINT8ARRAY_PROTOTYPE, + DUK_BIDX_UINT8CLAMPEDARRAY_PROTOTYPE, + DUK_BIDX_INT16ARRAY_PROTOTYPE, + DUK_BIDX_UINT16ARRAY_PROTOTYPE, + DUK_BIDX_INT32ARRAY_PROTOTYPE, + DUK_BIDX_UINT32ARRAY_PROTOTYPE, + DUK_BIDX_FLOAT32ARRAY_PROTOTYPE, + DUK_BIDX_FLOAT64ARRAY_PROTOTYPE +}; + +/* Map DUK_HBUFOBJ_ELEM_xxx to duk_hobject class number. + * Sync with duk_hbufobj.h and duk_hobject.h. + */ +static const duk_uint8_t duk__buffer_class_from_elemtype[9] = { + DUK_HOBJECT_CLASS_UINT8ARRAY, + DUK_HOBJECT_CLASS_UINT8CLAMPEDARRAY, + DUK_HOBJECT_CLASS_INT8ARRAY, + DUK_HOBJECT_CLASS_UINT16ARRAY, + DUK_HOBJECT_CLASS_INT16ARRAY, + DUK_HOBJECT_CLASS_UINT32ARRAY, + DUK_HOBJECT_CLASS_INT32ARRAY, + DUK_HOBJECT_CLASS_FLOAT32ARRAY, + DUK_HOBJECT_CLASS_FLOAT64ARRAY +}; + +/* Map DUK_HBUFOBJ_ELEM_xxx to prototype object built-in index. + * Sync with duk_hbufobj.h. + */ +static const duk_uint8_t duk__buffer_proto_from_elemtype[9] = { + DUK_BIDX_UINT8ARRAY_PROTOTYPE, + DUK_BIDX_UINT8CLAMPEDARRAY_PROTOTYPE, + DUK_BIDX_INT8ARRAY_PROTOTYPE, + DUK_BIDX_UINT16ARRAY_PROTOTYPE, + DUK_BIDX_INT16ARRAY_PROTOTYPE, + DUK_BIDX_UINT32ARRAY_PROTOTYPE, + DUK_BIDX_INT32ARRAY_PROTOTYPE, + DUK_BIDX_FLOAT32ARRAY_PROTOTYPE, + DUK_BIDX_FLOAT64ARRAY_PROTOTYPE +}; + +/* Map DUK__FLD_xxx to byte size. */ +static const duk_uint8_t duk__buffer_nbytes_from_fldtype[6] = { + 1, /* DUK__FLD_8BIT */ + 2, /* DUK__FLD_16BIT */ + 4, /* DUK__FLD_32BIT */ + 4, /* DUK__FLD_FLOAT */ + 8, /* DUK__FLD_DOUBLE */ + 0 /* DUK__FLD_VARINT; not relevant here */ +}; + +/* Bitfield for each DUK_HBUFOBJ_ELEM_xxx indicating which element types + * are compatible with a blind byte copy for the TypedArray set() method (also + * used for TypedArray constructor). Array index is target buffer elem type, + * bitfield indicates compatible source types. The types must have same byte + * size and they must be coercion compatible. + */ +#if !defined(DUK_USE_PREFER_SIZE) +static duk_uint16_t duk__buffer_elemtype_copy_compatible[9] = { + /* xxx -> DUK_HBUFOBJ_ELEM_UINT8 */ + (1U << DUK_HBUFOBJ_ELEM_UINT8) | + (1U << DUK_HBUFOBJ_ELEM_UINT8CLAMPED) | + (1U << DUK_HBUFOBJ_ELEM_INT8), + + /* xxx -> DUK_HBUFOBJ_ELEM_UINT8CLAMPED + * Note: INT8 is -not- copy compatible, e.g. -1 would coerce to 0x00. + */ + (1U << DUK_HBUFOBJ_ELEM_UINT8) | + (1U << DUK_HBUFOBJ_ELEM_UINT8CLAMPED), + + /* xxx -> DUK_HBUFOBJ_ELEM_INT8 */ + (1U << DUK_HBUFOBJ_ELEM_UINT8) | + (1U << DUK_HBUFOBJ_ELEM_UINT8CLAMPED) | + (1U << DUK_HBUFOBJ_ELEM_INT8), + + /* xxx -> DUK_HBUFOBJ_ELEM_UINT16 */ + (1U << DUK_HBUFOBJ_ELEM_UINT16) | + (1U << DUK_HBUFOBJ_ELEM_INT16), + + /* xxx -> DUK_HBUFOBJ_ELEM_INT16 */ + (1U << DUK_HBUFOBJ_ELEM_UINT16) | + (1U << DUK_HBUFOBJ_ELEM_INT16), + + /* xxx -> DUK_HBUFOBJ_ELEM_UINT32 */ + (1U << DUK_HBUFOBJ_ELEM_UINT32) | + (1U << DUK_HBUFOBJ_ELEM_INT32), + + /* xxx -> DUK_HBUFOBJ_ELEM_INT32 */ + (1U << DUK_HBUFOBJ_ELEM_UINT32) | + (1U << DUK_HBUFOBJ_ELEM_INT32), + + /* xxx -> DUK_HBUFOBJ_ELEM_FLOAT32 */ + (1U << DUK_HBUFOBJ_ELEM_FLOAT32), + + /* xxx -> DUK_HBUFOBJ_ELEM_FLOAT64 */ + (1U << DUK_HBUFOBJ_ELEM_FLOAT64) +}; +#endif /* !DUK_USE_PREFER_SIZE */ + +DUK_LOCAL duk_hbufobj *duk__hbufobj_promote_this(duk_hthread *thr) { + duk_tval *tv_dst; + duk_hbufobj *res; + + duk_push_this(thr); + DUK_ASSERT(duk_is_buffer(thr, -1)); + res = (duk_hbufobj *) duk_to_hobject(thr, -1); + DUK_ASSERT_HBUFOBJ_VALID(res); + DUK_DD(DUK_DDPRINT("promoted 'this' automatically to an ArrayBuffer: %!iT", duk_get_tval(thr, -1))); + + tv_dst = duk_get_borrowed_this_tval(thr); + DUK_TVAL_SET_OBJECT_UPDREF(thr, tv_dst, (duk_hobject *) res); + duk_pop(thr); + + return res; +} + +#define DUK__BUFOBJ_FLAG_THROW (1 << 0) +#define DUK__BUFOBJ_FLAG_PROMOTE (1 << 1) + +/* Shared helper. When DUK__BUFOBJ_FLAG_PROMOTE is given, the return value is + * always a duk_hbufobj *. Without the flag the return value can also be a + * plain buffer, and the caller must check for it using DUK_HEAPHDR_IS_BUFFER(). + */ +DUK_LOCAL duk_heaphdr *duk__getrequire_bufobj_this(duk_hthread *thr, duk_small_uint_t flags) { + duk_tval *tv; + duk_hbufobj *h_this; + + DUK_ASSERT(thr != NULL); + + tv = duk_get_borrowed_this_tval(thr); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_OBJECT(tv)) { + h_this = (duk_hbufobj *) DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h_this != NULL); + if (DUK_HOBJECT_IS_BUFOBJ((duk_hobject *) h_this)) { + DUK_ASSERT_HBUFOBJ_VALID(h_this); + return (duk_heaphdr *) h_this; + } + } else if (DUK_TVAL_IS_BUFFER(tv)) { + if (flags & DUK__BUFOBJ_FLAG_PROMOTE) { + /* Promote a plain buffer to a Uint8Array. This is very + * inefficient but allows plain buffer to be used wherever an + * Uint8Array is used with very small cost; hot path functions + * like index read/write calls should provide direct buffer + * support to avoid promotion. + */ + /* XXX: make this conditional to a flag if call sites need it? */ + h_this = duk__hbufobj_promote_this(thr); + DUK_ASSERT(h_this != NULL); + DUK_ASSERT_HBUFOBJ_VALID(h_this); + return (duk_heaphdr *) h_this; + } else { + /* XXX: ugly, share return pointer for duk_hbuffer. */ + return (duk_heaphdr *) DUK_TVAL_GET_BUFFER(tv); + } + } + + if (flags & DUK__BUFOBJ_FLAG_THROW) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_BUFFER); + DUK_WO_NORETURN(return NULL;); + } + return NULL; +} + +/* Check that 'this' is a duk_hbufobj and return a pointer to it. */ +DUK_LOCAL duk_hbufobj *duk__get_bufobj_this(duk_hthread *thr) { + return (duk_hbufobj *) duk__getrequire_bufobj_this(thr, DUK__BUFOBJ_FLAG_PROMOTE); +} + +/* Check that 'this' is a duk_hbufobj and return a pointer to it + * (NULL if not). + */ +DUK_LOCAL duk_hbufobj *duk__require_bufobj_this(duk_hthread *thr) { + return (duk_hbufobj *) duk__getrequire_bufobj_this(thr, DUK__BUFOBJ_FLAG_THROW | DUK__BUFOBJ_FLAG_PROMOTE); +} + +/* Check that value is a duk_hbufobj and return a pointer to it. */ +DUK_LOCAL duk_hbufobj *duk__require_bufobj_value(duk_hthread *thr, duk_idx_t idx) { + duk_tval *tv; + duk_hbufobj *h_obj; + + /* Don't accept relative indices now. */ + DUK_ASSERT(idx >= 0); + + tv = duk_require_tval(thr, idx); + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_OBJECT(tv)) { + h_obj = (duk_hbufobj *) DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h_obj != NULL); + if (DUK_HOBJECT_IS_BUFOBJ((duk_hobject *) h_obj)) { + DUK_ASSERT_HBUFOBJ_VALID(h_obj); + return h_obj; + } + } else if (DUK_TVAL_IS_BUFFER(tv)) { + h_obj = (duk_hbufobj *) duk_to_hobject(thr, idx); + DUK_ASSERT(h_obj != NULL); + DUK_ASSERT_HBUFOBJ_VALID(h_obj); + return h_obj; + } + + DUK_ERROR_TYPE(thr, DUK_STR_NOT_BUFFER); + DUK_WO_NORETURN(return NULL;); +} + +DUK_LOCAL void duk__set_bufobj_buffer(duk_hthread *thr, duk_hbufobj *h_bufobj, duk_hbuffer *h_val) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h_bufobj != NULL); + DUK_ASSERT(h_bufobj->buf == NULL); /* no need to decref */ + DUK_ASSERT(h_val != NULL); + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + DUK_UNREF(thr); + + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + h_bufobj->length = (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_val); + DUK_ASSERT(h_bufobj->shift == 0); + DUK_ASSERT(h_bufobj->elem_type == DUK_HBUFOBJ_ELEM_UINT8); + DUK_ASSERT(h_bufobj->is_typedarray == 0); + + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); +} + +/* Shared offset/length coercion helper. */ +DUK_LOCAL void duk__resolve_offset_opt_length(duk_hthread *thr, + duk_hbufobj *h_bufarg, + duk_idx_t idx_offset, + duk_idx_t idx_length, + duk_uint_t *out_offset, + duk_uint_t *out_length, + duk_bool_t throw_flag) { + duk_int_t offset_signed; + duk_int_t length_signed; + duk_uint_t offset; + duk_uint_t length; + + offset_signed = duk_to_int(thr, idx_offset); + if (offset_signed < 0) { + goto fail_range; + } + offset = (duk_uint_t) offset_signed; + if (offset > h_bufarg->length) { + goto fail_range; + } + DUK_ASSERT_DISABLE(offset >= 0); /* unsigned */ + DUK_ASSERT(offset <= h_bufarg->length); + + if (duk_is_undefined(thr, idx_length)) { + DUK_ASSERT(h_bufarg->length >= offset); + length = h_bufarg->length - offset; /* >= 0 */ + } else { + length_signed = duk_to_int(thr, idx_length); + if (length_signed < 0) { + goto fail_range; + } + length = (duk_uint_t) length_signed; + DUK_ASSERT(h_bufarg->length >= offset); + if (length > h_bufarg->length - offset) { + /* Unlike for negative arguments, some call sites + * want length to be clamped if it's positive. + */ + if (throw_flag) { + goto fail_range; + } else { + length = h_bufarg->length - offset; + } + } + } + DUK_ASSERT_DISABLE(length >= 0); /* unsigned */ + DUK_ASSERT(offset + length <= h_bufarg->length); + + *out_offset = offset; + *out_length = length; + return; + + fail_range: + DUK_ERROR_RANGE(thr, DUK_STR_INVALID_ARGS); + DUK_WO_NORETURN(return;); +} + +/* Shared lenient buffer length clamping helper. No negative indices, no + * element/byte shifting. + */ +DUK_LOCAL void duk__clamp_startend_nonegidx_noshift(duk_hthread *thr, + duk_int_t buffer_length, + duk_idx_t idx_start, + duk_idx_t idx_end, + duk_int_t *out_start_offset, + duk_int_t *out_end_offset) { + duk_int_t start_offset; + duk_int_t end_offset; + + DUK_ASSERT(out_start_offset != NULL); + DUK_ASSERT(out_end_offset != NULL); + + /* undefined coerces to zero which is correct */ + start_offset = duk_to_int_clamped(thr, idx_start, 0, buffer_length); + if (duk_is_undefined(thr, idx_end)) { + end_offset = buffer_length; + } else { + end_offset = duk_to_int_clamped(thr, idx_end, start_offset, buffer_length); + } + + DUK_ASSERT(start_offset >= 0); + DUK_ASSERT(start_offset <= buffer_length); + DUK_ASSERT(end_offset >= 0); + DUK_ASSERT(end_offset <= buffer_length); + DUK_ASSERT(start_offset <= end_offset); + + *out_start_offset = start_offset; + *out_end_offset = end_offset; +} + +/* Shared lenient buffer length clamping helper. Indices are treated as + * element indices (though output values are byte offsets) which only + * really matters for TypedArray views as other buffer object have a zero + * shift. Negative indices are counted from end of input slice; crossed + * indices are clamped to zero length; and final indices are clamped + * against input slice. Used for e.g. ArrayBuffer slice(). + */ +DUK_LOCAL void duk__clamp_startend_negidx_shifted(duk_hthread *thr, + duk_int_t buffer_length, + duk_uint8_t buffer_shift, + duk_idx_t idx_start, + duk_idx_t idx_end, + duk_int_t *out_start_offset, + duk_int_t *out_end_offset) { + duk_int_t start_offset; + duk_int_t end_offset; + + DUK_ASSERT(out_start_offset != NULL); + DUK_ASSERT(out_end_offset != NULL); + + buffer_length >>= buffer_shift; /* as (full) elements */ + + /* Resolve start/end offset as element indices first; arguments + * at idx_start/idx_end are element offsets. Working with element + * indices first also avoids potential for wrapping. + */ + + start_offset = duk_to_int(thr, idx_start); + if (start_offset < 0) { + start_offset = buffer_length + start_offset; + } + if (duk_is_undefined(thr, idx_end)) { + end_offset = buffer_length; + } else { + end_offset = duk_to_int(thr, idx_end); + if (end_offset < 0) { + end_offset = buffer_length + end_offset; + } + } + /* Note: start_offset/end_offset can still be < 0 here. */ + + if (start_offset < 0) { + start_offset = 0; + } else if (start_offset > buffer_length) { + start_offset = buffer_length; + } + if (end_offset < start_offset) { + end_offset = start_offset; + } else if (end_offset > buffer_length) { + end_offset = buffer_length; + } + DUK_ASSERT(start_offset >= 0); + DUK_ASSERT(start_offset <= buffer_length); + DUK_ASSERT(end_offset >= 0); + DUK_ASSERT(end_offset <= buffer_length); + DUK_ASSERT(start_offset <= end_offset); + + /* Convert indices to byte offsets. */ + start_offset <<= buffer_shift; + end_offset <<= buffer_shift; + + *out_start_offset = start_offset; + *out_end_offset = end_offset; +} + +DUK_INTERNAL void duk_hbufobj_promote_plain(duk_hthread *thr, duk_idx_t idx) { + if (duk_is_buffer(thr, idx)) { + duk_to_object(thr, idx); + } +} + +DUK_INTERNAL void duk_hbufobj_push_uint8array_from_plain(duk_hthread *thr, duk_hbuffer *h_buf) { + /* Push Uint8Array which will share the same underlying buffer as + * the plain buffer argument. Also create an ArrayBuffer with the + * same backing for the result .buffer property. + */ + + duk_push_hbuffer(thr, h_buf); + duk_push_buffer_object(thr, -1, 0, (duk_size_t) DUK_HBUFFER_GET_SIZE(h_buf), DUK_BUFOBJ_UINT8ARRAY); + duk_remove_m2(thr); + +#if 0 + /* More verbose equivalent; maybe useful if e.g. .buffer is omitted. */ + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_UINT8ARRAY), + DUK_BIDX_UINT8ARRAY_PROTOTYPE); + DUK_ASSERT(h_bufobj != NULL); + duk__set_bufobj_buffer(thr, h_bufobj, h_buf); + h_bufobj->is_typedarray = 1; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + h_arrbuf = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARRAYBUFFER), + DUK_BIDX_ARRAYBUFFER_PROTOTYPE); + DUK_ASSERT(h_arrbuf != NULL); + duk__set_bufobj_buffer(thr, h_arrbuf, h_buf); + DUK_ASSERT(h_arrbuf->is_typedarray == 0); + DUK_ASSERT_HBUFOBJ_VALID(h_arrbuf); + + DUK_ASSERT(h_bufobj->buf_prop == NULL); + h_bufobj->buf_prop = (duk_hobject *) h_arrbuf; + DUK_ASSERT(h_arrbuf != NULL); + DUK_HBUFOBJ_INCREF(thr, h_arrbuf); + duk_pop(thr); +#endif +} + +/* Indexed read helper for buffer objects, also called from outside this file. */ +DUK_INTERNAL void duk_hbufobj_push_validated_read(duk_hthread *thr, duk_hbufobj *h_bufobj, duk_uint8_t *p, duk_small_uint_t elem_size) { + duk_double_union du; + + DUK_ASSERT(elem_size > 0); + duk_memcpy((void *) du.uc, (const void *) p, (size_t) elem_size); + + switch (h_bufobj->elem_type) { + case DUK_HBUFOBJ_ELEM_UINT8: + case DUK_HBUFOBJ_ELEM_UINT8CLAMPED: + duk_push_uint(thr, (duk_uint_t) du.uc[0]); + break; + case DUK_HBUFOBJ_ELEM_INT8: + duk_push_int(thr, (duk_int_t) (duk_int8_t) du.uc[0]); + break; + case DUK_HBUFOBJ_ELEM_UINT16: + duk_push_uint(thr, (duk_uint_t) du.us[0]); + break; + case DUK_HBUFOBJ_ELEM_INT16: + duk_push_int(thr, (duk_int_t) (duk_int16_t) du.us[0]); + break; + case DUK_HBUFOBJ_ELEM_UINT32: + duk_push_uint(thr, (duk_uint_t) du.ui[0]); + break; + case DUK_HBUFOBJ_ELEM_INT32: + duk_push_int(thr, (duk_int_t) (duk_int32_t) du.ui[0]); + break; + case DUK_HBUFOBJ_ELEM_FLOAT32: + duk_push_number(thr, (duk_double_t) du.f[0]); + break; + case DUK_HBUFOBJ_ELEM_FLOAT64: + duk_push_number(thr, (duk_double_t) du.d); + break; + default: + DUK_UNREACHABLE(); + } +} + +/* Indexed write helper for buffer objects, also called from outside this file. */ +DUK_INTERNAL void duk_hbufobj_validated_write(duk_hthread *thr, duk_hbufobj *h_bufobj, duk_uint8_t *p, duk_small_uint_t elem_size) { + duk_double_union du; + + /* NOTE! Caller must ensure that any side effects from the + * coercions below are safe. If that cannot be guaranteed + * (which is normally the case), caller must coerce the + * argument using duk_to_number() before any pointer + * validations; the result of duk_to_number() always coerces + * without side effects here. + */ + + switch (h_bufobj->elem_type) { + case DUK_HBUFOBJ_ELEM_UINT8: + du.uc[0] = (duk_uint8_t) duk_to_uint32(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_UINT8CLAMPED: + du.uc[0] = (duk_uint8_t) duk_to_uint8clamped(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_INT8: + du.uc[0] = (duk_uint8_t) duk_to_int32(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_UINT16: + du.us[0] = (duk_uint16_t) duk_to_uint32(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_INT16: + du.us[0] = (duk_uint16_t) duk_to_int32(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_UINT32: + du.ui[0] = (duk_uint32_t) duk_to_uint32(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_INT32: + du.ui[0] = (duk_uint32_t) duk_to_int32(thr, -1); + break; + case DUK_HBUFOBJ_ELEM_FLOAT32: + /* A double-to-float cast is undefined behavior in C99 if + * the cast is out-of-range, so use a helper. Example: + * runtime error: value -1e+100 is outside the range of representable values of type 'float' + */ + du.f[0] = duk_double_to_float_t(duk_to_number_m1(thr)); + break; + case DUK_HBUFOBJ_ELEM_FLOAT64: + du.d = (duk_double_t) duk_to_number_m1(thr); + break; + default: + DUK_UNREACHABLE(); + } + + DUK_ASSERT(elem_size > 0); + duk_memcpy((void *) p, (const void *) du.uc, (size_t) elem_size); +} + +/* Helper to create a fixed buffer from argument value at index 0. + * Node.js and allocPlain() compatible. + */ +DUK_LOCAL duk_hbuffer *duk__hbufobj_fixed_from_argvalue(duk_hthread *thr) { + duk_int_t len; + duk_int_t i; + duk_size_t buf_size; + duk_uint8_t *buf; + + switch (duk_get_type(thr, 0)) { + case DUK_TYPE_NUMBER: { + len = duk_to_int_clamped(thr, 0, 0, DUK_INT_MAX); + (void) duk_push_fixed_buffer_zero(thr, (duk_size_t) len); + break; + } + case DUK_TYPE_BUFFER: { /* Treat like Uint8Array. */ + goto slow_copy; + } + case DUK_TYPE_OBJECT: { + duk_hobject *h; + duk_hbufobj *h_bufobj; + + /* For Node.js Buffers "Passing an ArrayBuffer returns a Buffer + * that shares allocated memory with the given ArrayBuffer." + * https://nodejs.org/api/buffer.html#buffer_buffer_from_buffer_alloc_and_buffer_allocunsafe + */ + + h = duk_known_hobject(thr, 0); + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_ARRAYBUFFER) { + DUK_ASSERT(DUK_HOBJECT_IS_BUFOBJ(h)); + h_bufobj = (duk_hbufobj *) h; + if (DUK_UNLIKELY(h_bufobj->buf == NULL)) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return NULL;); + } + if (DUK_UNLIKELY(h_bufobj->offset != 0 || h_bufobj->length != DUK_HBUFFER_GET_SIZE(h_bufobj->buf))) { + /* No support for ArrayBuffers with slice + * offset/length. + */ + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return NULL;); + } + duk_push_hbuffer(thr, h_bufobj->buf); + return h_bufobj->buf; + } + goto slow_copy; + } + case DUK_TYPE_STRING: { + /* ignore encoding for now */ + duk_require_hstring_notsymbol(thr, 0); + duk_dup_0(thr); + (void) duk_to_buffer(thr, -1, &buf_size); + break; + } + default: + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return NULL;); + } + + done: + DUK_ASSERT(duk_is_buffer(thr, -1)); + return duk_known_hbuffer(thr, -1); + + slow_copy: + /* XXX: fast path for typed arrays and other buffer objects? */ + + (void) duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_LENGTH); + len = duk_to_int_clamped(thr, -1, 0, DUK_INT_MAX); + duk_pop(thr); + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, (duk_size_t) len); /* no zeroing, all indices get initialized */ + for (i = 0; i < len; i++) { + /* XXX: fast path for array or buffer arguments? */ + duk_get_prop_index(thr, 0, (duk_uarridx_t) i); + buf[i] = (duk_uint8_t) (duk_to_uint32(thr, -1) & 0xffU); + duk_pop(thr); + } + goto done; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer constructor + * + * Node.js Buffers are just Uint8Arrays with internal prototype set to + * Buffer.prototype so they're handled otherwise the same as Uint8Array. + * However, the constructor arguments are very different so a separate + * constructor entry point is used. + */ +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_constructor(duk_hthread *thr) { + duk_hbuffer *h_buf; + + h_buf = duk__hbufobj_fixed_from_argvalue(thr); + DUK_ASSERT(h_buf != NULL); + + duk_push_buffer_object(thr, + -1, + 0, + DUK_HBUFFER_FIXED_GET_SIZE((duk_hbuffer_fixed *) (void *) h_buf), + DUK_BUFOBJ_UINT8ARRAY); + duk_push_hobject_bidx(thr, DUK_BIDX_NODEJS_BUFFER_PROTOTYPE); + duk_set_prototype(thr, -2); + + /* XXX: a more direct implementation */ + + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * ArrayBuffer, DataView, and TypedArray constructors + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_arraybuffer_constructor(duk_hthread *thr) { + duk_hbufobj *h_bufobj; + duk_hbuffer *h_val; + duk_int_t len; + + DUK_ASSERT_CTX_VALID(thr); + + duk_require_constructor_call(thr); + + len = duk_to_int(thr, 0); + if (len < 0) { + goto fail_length; + } + (void) duk_push_fixed_buffer_zero(thr, (duk_size_t) len); + h_val = (duk_hbuffer *) duk_known_hbuffer(thr, -1); + + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARRAYBUFFER), + DUK_BIDX_ARRAYBUFFER_PROTOTYPE); + DUK_ASSERT(h_bufobj != NULL); + + duk__set_bufobj_buffer(thr, h_bufobj, h_val); + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + return 1; + + fail_length: + DUK_DCERROR_RANGE_INVALID_LENGTH(thr); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + + +/* Format of magic, bits: + * 0...1: elem size shift (0-3) + * 2...5: elem type (DUK_HBUFOBJ_ELEM_xxx) + * + * XXX: add prototype bidx explicitly to magic instead of using a mapping? + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_typedarray_constructor(duk_hthread *thr) { + duk_tval *tv; + duk_hobject *h_obj; + duk_hbufobj *h_bufobj = NULL; + duk_hbufobj *h_bufarg = NULL; + duk_hbuffer *h_val; + duk_small_uint_t magic; + duk_small_uint_t shift; + duk_small_uint_t elem_type; + duk_small_uint_t elem_size; + duk_small_uint_t class_num; + duk_small_uint_t proto_bidx; + duk_uint_t align_mask; + duk_uint_t elem_length; + duk_int_t elem_length_signed; + duk_uint_t byte_length; + duk_small_uint_t copy_mode; + + /* XXX: The same copy helpers could be shared with at least some + * buffer functions. + */ + + duk_require_constructor_call(thr); + + /* We could fit built-in index into magic but that'd make the magic + * number dependent on built-in numbering (genbuiltins.py doesn't + * handle that yet). So map both class and prototype from the + * element type. + */ + magic = (duk_small_uint_t) duk_get_current_magic(thr); + shift = magic & 0x03U; /* bits 0...1: shift */ + elem_type = (magic >> 2) & 0x0fU; /* bits 2...5: type */ + elem_size = 1U << shift; + align_mask = elem_size - 1; + DUK_ASSERT(elem_type < sizeof(duk__buffer_proto_from_elemtype) / sizeof(duk_uint8_t)); + proto_bidx = duk__buffer_proto_from_elemtype[elem_type]; + DUK_ASSERT(proto_bidx < DUK_NUM_BUILTINS); + DUK_ASSERT(elem_type < sizeof(duk__buffer_class_from_elemtype) / sizeof(duk_uint8_t)); + class_num = duk__buffer_class_from_elemtype[elem_type]; + + DUK_DD(DUK_DDPRINT("typedarray constructor, magic=%d, shift=%d, elem_type=%d, " + "elem_size=%d, proto_bidx=%d, class_num=%d", + (int) magic, (int) shift, (int) elem_type, (int) elem_size, + (int) proto_bidx, (int) class_num)); + + /* Argument variants. When the argument is an ArrayBuffer a view to + * the same buffer is created; otherwise a new ArrayBuffer is always + * created. + */ + + /* XXX: initial iteration to treat a plain buffer like an ArrayBuffer: + * coerce to an ArrayBuffer object and use that as .buffer. The underlying + * buffer will be the same but result .buffer !== inputPlainBuffer. + */ + duk_hbufobj_promote_plain(thr, 0); + + tv = duk_get_tval(thr, 0); + DUK_ASSERT(tv != NULL); /* arg count */ + if (DUK_TVAL_IS_OBJECT(tv)) { + h_obj = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h_obj != NULL); + + if (DUK_HOBJECT_GET_CLASS_NUMBER(h_obj) == DUK_HOBJECT_CLASS_ARRAYBUFFER) { + /* ArrayBuffer: unlike any other argument variant, create + * a view into the existing buffer. + */ + + duk_int_t byte_offset_signed; + duk_uint_t byte_offset; + + h_bufarg = (duk_hbufobj *) h_obj; + + byte_offset_signed = duk_to_int(thr, 1); + if (byte_offset_signed < 0) { + goto fail_arguments; + } + byte_offset = (duk_uint_t) byte_offset_signed; + if (byte_offset > h_bufarg->length || + (byte_offset & align_mask) != 0) { + /* Must be >= 0 and multiple of element size. */ + goto fail_arguments; + } + if (duk_is_undefined(thr, 2)) { + DUK_ASSERT(h_bufarg->length >= byte_offset); + byte_length = h_bufarg->length - byte_offset; + if ((byte_length & align_mask) != 0) { + /* Must be element size multiple from + * start offset to end of buffer. + */ + goto fail_arguments; + } + elem_length = (byte_length >> shift); + } else { + elem_length_signed = duk_to_int(thr, 2); + if (elem_length_signed < 0) { + goto fail_arguments; + } + elem_length = (duk_uint_t) elem_length_signed; + byte_length = elem_length << shift; + if ((byte_length >> shift) != elem_length) { + /* Byte length would overflow. */ + /* XXX: easier check with less code? */ + goto fail_arguments; + } + DUK_ASSERT(h_bufarg->length >= byte_offset); + if (byte_length > h_bufarg->length - byte_offset) { + /* Not enough data. */ + goto fail_arguments; + } + } + DUK_UNREF(elem_length); + DUK_ASSERT_DISABLE(byte_offset >= 0); + DUK_ASSERT(byte_offset <= h_bufarg->length); + DUK_ASSERT_DISABLE(byte_length >= 0); + DUK_ASSERT(byte_offset + byte_length <= h_bufarg->length); + DUK_ASSERT((elem_length << shift) == byte_length); + + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(class_num), + (duk_small_int_t) proto_bidx); + h_val = h_bufarg->buf; + if (h_val == NULL) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + h_bufobj->offset = h_bufarg->offset + byte_offset; + h_bufobj->length = byte_length; + h_bufobj->shift = (duk_uint8_t) shift; + h_bufobj->elem_type = (duk_uint8_t) elem_type; + h_bufobj->is_typedarray = 1; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + /* Set .buffer to the argument ArrayBuffer. */ + DUK_ASSERT(h_bufobj->buf_prop == NULL); + h_bufobj->buf_prop = (duk_hobject *) h_bufarg; + DUK_ASSERT(h_bufarg != NULL); + DUK_HBUFOBJ_INCREF(thr, h_bufarg); + return 1; + } else if (DUK_HOBJECT_IS_BUFOBJ(h_obj)) { + /* TypedArray (or other non-ArrayBuffer duk_hbufobj). + * Conceptually same behavior as for an Array-like argument, + * with a few fast paths. + */ + + h_bufarg = (duk_hbufobj *) h_obj; + DUK_ASSERT_HBUFOBJ_VALID(h_bufarg); + elem_length_signed = (duk_int_t) (h_bufarg->length >> h_bufarg->shift); + if (h_bufarg->buf == NULL) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + /* Select copy mode. Must take into account element + * compatibility and validity of the underlying source + * buffer. + */ + + DUK_DDD(DUK_DDDPRINT("selecting copy mode for bufobj arg, " + "src byte_length=%ld, src shift=%d, " + "src/dst elem_length=%ld; " + "dst shift=%d -> dst byte_length=%ld", + (long) h_bufarg->length, (int) h_bufarg->shift, + (long) elem_length_signed, (int) shift, + (long) (elem_length_signed << shift))); + + copy_mode = 2; /* default is explicit index read/write copy */ +#if !defined(DUK_USE_PREFER_SIZE) + /* With a size optimized build copy_mode 2 is enough. + * Modes 0 and 1 are faster but conceptually the same. + */ + DUK_ASSERT(elem_type < sizeof(duk__buffer_elemtype_copy_compatible) / sizeof(duk_uint16_t)); + if (DUK_HBUFOBJ_VALID_SLICE(h_bufarg)) { + if ((duk__buffer_elemtype_copy_compatible[elem_type] & (1 << h_bufarg->elem_type)) != 0) { + DUK_DDD(DUK_DDDPRINT("source/target are copy compatible, memcpy")); + DUK_ASSERT(shift == h_bufarg->shift); /* byte sizes will match */ + copy_mode = 0; + } else { + DUK_DDD(DUK_DDDPRINT("source/target not copy compatible but valid, fast copy")); + copy_mode = 1; + } + } +#endif /* !DUK_USE_PREFER_SIZE */ + } else { + /* Array or Array-like */ + elem_length_signed = (duk_int_t) duk_get_length(thr, 0); + copy_mode = 2; + } + } else { + /* Non-object argument is simply int coerced, matches + * V8 behavior (except for "null", which we coerce to + * 0 but V8 TypeErrors). + */ + elem_length_signed = duk_to_int(thr, 0); + copy_mode = 3; + } + if (elem_length_signed < 0) { + goto fail_arguments; + } + elem_length = (duk_uint_t) elem_length_signed; + byte_length = (duk_uint_t) (elem_length << shift); + if ((byte_length >> shift) != elem_length) { + /* Byte length would overflow. */ + /* XXX: easier check with less code? */ + goto fail_arguments; + } + + DUK_DDD(DUK_DDDPRINT("elem_length=%ld, byte_length=%ld", + (long) elem_length, (long) byte_length)); + + /* ArrayBuffer argument is handled specially above; the rest of the + * argument variants are handled by shared code below. + * + * ArrayBuffer in h_bufobj->buf_prop is intentionally left unset. + * It will be automatically created by the .buffer accessor on + * first access. + */ + + /* Push the resulting view object on top of a plain fixed buffer. */ + (void) duk_push_fixed_buffer(thr, byte_length); + h_val = duk_known_hbuffer(thr, -1); + DUK_ASSERT(h_val != NULL); + + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(class_num), + (duk_small_int_t) proto_bidx); + + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + DUK_ASSERT(h_bufobj->offset == 0); + h_bufobj->length = byte_length; + h_bufobj->shift = (duk_uint8_t) shift; + h_bufobj->elem_type = (duk_uint8_t) elem_type; + h_bufobj->is_typedarray = 1; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + /* Copy values, the copy method depends on the arguments. + * + * Copy mode decision may depend on the validity of the underlying + * buffer of the source argument; there must be no harmful side effects + * from there to here for copy_mode to still be valid. + */ + DUK_DDD(DUK_DDDPRINT("copy mode: %d", (int) copy_mode)); + switch (copy_mode) { + /* Copy modes 0 and 1 can be omitted in size optimized build, + * copy mode 2 handles them (but more slowly). + */ +#if !defined(DUK_USE_PREFER_SIZE) + case 0: { + /* Use byte copy. */ + + duk_uint8_t *p_src; + duk_uint8_t *p_dst; + + DUK_ASSERT(h_bufobj != NULL); + DUK_ASSERT(h_bufobj->buf != NULL); + DUK_ASSERT(DUK_HBUFOBJ_VALID_SLICE(h_bufobj)); + DUK_ASSERT(h_bufarg != NULL); + DUK_ASSERT(h_bufarg->buf != NULL); + DUK_ASSERT(DUK_HBUFOBJ_VALID_SLICE(h_bufarg)); + + p_dst = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufobj); + p_src = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufarg); + + DUK_DDD(DUK_DDDPRINT("using memcpy: p_src=%p, p_dst=%p, byte_length=%ld", + (void *) p_src, (void *) p_dst, (long) byte_length)); + + duk_memcpy_unsafe((void *) p_dst, (const void *) p_src, (size_t) byte_length); + break; + } + case 1: { + /* Copy values through direct validated reads and writes. */ + + duk_small_uint_t src_elem_size; + duk_small_uint_t dst_elem_size; + duk_uint8_t *p_src; + duk_uint8_t *p_src_end; + duk_uint8_t *p_dst; + + DUK_ASSERT(h_bufobj != NULL); + DUK_ASSERT(h_bufobj->buf != NULL); + DUK_ASSERT(DUK_HBUFOBJ_VALID_SLICE(h_bufobj)); + DUK_ASSERT(h_bufarg != NULL); + DUK_ASSERT(h_bufarg->buf != NULL); + DUK_ASSERT(DUK_HBUFOBJ_VALID_SLICE(h_bufarg)); + + src_elem_size = (duk_small_uint_t) (1U << h_bufarg->shift); + dst_elem_size = elem_size; + + p_src = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufarg); + p_dst = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufobj); + p_src_end = p_src + h_bufarg->length; + + DUK_DDD(DUK_DDDPRINT("using fast copy: p_src=%p, p_src_end=%p, p_dst=%p, " + "src_elem_size=%d, dst_elem_size=%d", + (void *) p_src, (void *) p_src_end, (void *) p_dst, + (int) src_elem_size, (int) dst_elem_size)); + + while (p_src != p_src_end) { + DUK_DDD(DUK_DDDPRINT("fast path per element copy loop: " + "p_src=%p, p_src_end=%p, p_dst=%p", + (void *) p_src, (void *) p_src_end, (void *) p_dst)); + /* A validated read() is always a number, so it's write coercion + * is always side effect free an won't invalidate pointers etc. + */ + duk_hbufobj_push_validated_read(thr, h_bufarg, p_src, src_elem_size); + duk_hbufobj_validated_write(thr, h_bufobj, p_dst, dst_elem_size); + duk_pop(thr); + p_src += src_elem_size; + p_dst += dst_elem_size; + } + break; + } +#endif /* !DUK_USE_PREFER_SIZE */ + case 2: { + /* Copy values by index reads and writes. Let virtual + * property handling take care of coercion. + */ + duk_uint_t i; + + DUK_DDD(DUK_DDDPRINT("using slow copy")); + + for (i = 0; i < elem_length; i++) { + duk_get_prop_index(thr, 0, (duk_uarridx_t) i); + duk_put_prop_index(thr, -2, (duk_uarridx_t) i); + } + break; + } + default: + case 3: { + /* No copy, leave zero bytes in the buffer. There's no + * ambiguity with Float32/Float64 because zero bytes also + * represent 0.0. + */ + + DUK_DDD(DUK_DDDPRINT("using no copy")); + break; + } + } + + return 1; + + fail_arguments: + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#else /* DUK_USE_BUFFEROBJECT_SUPPORT */ +/* When bufferobject support is disabled, new Uint8Array() could still be + * supported to create a plain fixed buffer. Disabled for now. + */ +#if 0 +DUK_INTERNAL duk_ret_t duk_bi_typedarray_constructor(duk_hthread *thr) { + duk_int_t elem_length_signed; + duk_uint_t byte_length; + + /* XXX: The same copy helpers could be shared with at least some + * buffer functions. + */ + + duk_require_constructor_call(thr); + + elem_length_signed = duk_require_int(thr, 0); + if (elem_length_signed < 0) { + goto fail_arguments; + } + byte_length = (duk_uint_t) elem_length_signed; + + (void) duk_push_fixed_buffer_zero(thr, (duk_size_t) byte_length); + return 1; + + fail_arguments: + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#endif /* 0 */ +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_dataview_constructor(duk_hthread *thr) { + duk_hbufobj *h_bufarg; + duk_hbufobj *h_bufobj; + duk_hbuffer *h_val; + duk_uint_t offset; + duk_uint_t length; + + duk_require_constructor_call(thr); + + h_bufarg = duk__require_bufobj_value(thr, 0); + DUK_ASSERT(h_bufarg != NULL); + if (DUK_HOBJECT_GET_CLASS_NUMBER((duk_hobject *) h_bufarg) != DUK_HOBJECT_CLASS_ARRAYBUFFER) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + duk__resolve_offset_opt_length(thr, h_bufarg, 1, 2, &offset, &length, 1 /*throw_flag*/); + DUK_ASSERT(offset <= h_bufarg->length); + DUK_ASSERT(offset + length <= h_bufarg->length); + + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DATAVIEW), + DUK_BIDX_DATAVIEW_PROTOTYPE); + + h_val = h_bufarg->buf; + if (h_val == NULL) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + h_bufobj->offset = h_bufarg->offset + offset; + h_bufobj->length = length; + DUK_ASSERT(h_bufobj->shift == 0); + DUK_ASSERT(h_bufobj->elem_type == DUK_HBUFOBJ_ELEM_UINT8); + DUK_ASSERT(h_bufobj->is_typedarray == 0); + + DUK_ASSERT(h_bufobj->buf_prop == NULL); + h_bufobj->buf_prop = (duk_hobject *) h_bufarg; + DUK_ASSERT(h_bufarg != NULL); + DUK_HBUFOBJ_INCREF(thr, h_bufarg); + + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * ArrayBuffer.isView() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_arraybuffer_isview(duk_hthread *thr) { + duk_hobject *h_obj; + duk_bool_t ret = 0; + + if (duk_is_buffer(thr, 0)) { + ret = 1; + } else { + h_obj = duk_get_hobject(thr, 0); + if (h_obj != NULL && DUK_HOBJECT_IS_BUFOBJ(h_obj)) { + /* DataView needs special casing: ArrayBuffer.isView() is + * true, but ->is_typedarray is 0. + */ + ret = ((duk_hbufobj *) h_obj)->is_typedarray || + (DUK_HOBJECT_GET_CLASS_NUMBER(h_obj) == DUK_HOBJECT_CLASS_DATAVIEW); + } + } + duk_push_boolean(thr, ret); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Uint8Array.allocPlain() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_uint8array_allocplain(duk_hthread *thr) { + duk__hbufobj_fixed_from_argvalue(thr); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Uint8Array.plainOf() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_uint8array_plainof(duk_hthread *thr) { + duk_hbufobj *h_bufobj; + +#if !defined(DUK_USE_PREFER_SIZE) + /* Avoid churn if argument is already a plain buffer. */ + if (duk_is_buffer(thr, 0)) { + return 1; + } +#endif + + /* Promotes plain buffers to ArrayBuffers, so for a plain buffer + * argument we'll create a pointless temporary (but still work + * correctly). + */ + h_bufobj = duk__require_bufobj_value(thr, 0); + if (h_bufobj->buf == NULL) { + duk_push_undefined(thr); + } else { + duk_push_hbuffer(thr, h_bufobj->buf); + } + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer: toString([encoding], [start], [end]) + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_tostring(duk_hthread *thr) { + duk_hbufobj *h_this; + duk_int_t start_offset, end_offset; + duk_uint8_t *buf_slice; + duk_size_t slice_length; + + h_this = duk__get_bufobj_this(thr); + if (h_this == NULL) { + /* XXX: happens e.g. when evaluating: String(Buffer.prototype). */ + duk_push_literal(thr, "[object Object]"); + return 1; + } + DUK_ASSERT_HBUFOBJ_VALID(h_this); + + /* Ignore encoding for now. */ + + duk__clamp_startend_nonegidx_noshift(thr, + (duk_int_t) h_this->length, + 1 /*idx_start*/, + 2 /*idx_end*/, + &start_offset, + &end_offset); + + slice_length = (duk_size_t) (end_offset - start_offset); + buf_slice = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, slice_length); /* all bytes initialized below */ + DUK_ASSERT(buf_slice != NULL); + + /* Neutered or uncovered, TypeError. */ + if (h_this->buf == NULL || + !DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_this, (duk_size_t) start_offset + slice_length)) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + /* XXX: ideally we wouldn't make a copy but a view into the buffer for the + * decoding process. Or the decoding helper could be changed to accept + * the slice info (a buffer pointer is NOT a good approach because guaranteeing + * its stability is difficult). + */ + + DUK_ASSERT(DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_this, (duk_size_t) start_offset + slice_length)); + duk_memcpy_unsafe((void *) buf_slice, + (const void *) (DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this) + start_offset), + (size_t) slice_length); + + /* Use the equivalent of: new TextEncoder().encode(this) to convert the + * string. Result will be valid UTF-8; non-CESU-8 inputs are currently + * interpreted loosely. Value stack convention is a bit odd for now. + */ + duk_replace(thr, 0); + duk_set_top(thr, 1); + return duk_textdecoder_decode_utf8_nodejs(thr); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.prototype: toJSON() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_tojson(duk_hthread *thr) { + duk_hbufobj *h_this; + duk_uint8_t *buf; + duk_uint_t i, n; + duk_tval *tv; + + h_this = duk__require_bufobj_this(thr); + DUK_ASSERT(h_this != NULL); + + if (h_this->buf == NULL || !DUK_HBUFOBJ_VALID_SLICE(h_this)) { + /* Serialize uncovered backing buffer as a null; doesn't + * really matter as long we're memory safe. + */ + duk_push_null(thr); + return 1; + } + + duk_push_object(thr); + duk_push_hstring_stridx(thr, DUK_STRIDX_UC_BUFFER); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_TYPE); + + /* XXX: uninitialized would be OK */ + DUK_ASSERT_DISABLE((duk_size_t) h_this->length <= (duk_size_t) DUK_UINT32_MAX); + tv = duk_push_harray_with_size_outptr(thr, (duk_uint32_t) h_this->length); /* XXX: needs revision with >4G buffers */ + + DUK_ASSERT(h_this->buf != NULL); + buf = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this); + for (i = 0, n = h_this->length; i < n; i++) { + DUK_TVAL_SET_U32(tv + i, (duk_uint32_t) buf[i]); /* no need for decref or incref */ + } + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_DATA); + + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.prototype.equals() + * Node.js Buffer.prototype.compare() + * Node.js Buffer.compare() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_buffer_compare_shared(duk_hthread *thr) { + duk_small_uint_t magic; + duk_hbufobj *h_bufarg1; + duk_hbufobj *h_bufarg2; + duk_small_int_t comp_res; + + /* XXX: keep support for plain buffers and non-Node.js buffers? */ + + magic = (duk_small_uint_t) duk_get_current_magic(thr); + if (magic & 0x02U) { + /* Static call style. */ + h_bufarg1 = duk__require_bufobj_value(thr, 0); + h_bufarg2 = duk__require_bufobj_value(thr, 1); + } else { + h_bufarg1 = duk__require_bufobj_this(thr); + h_bufarg2 = duk__require_bufobj_value(thr, 0); + } + DUK_ASSERT(h_bufarg1 != NULL); + DUK_ASSERT(h_bufarg2 != NULL); + + /* We want to compare the slice/view areas of the arguments. + * If either slice/view is invalid (underlying buffer is shorter) + * ensure equals() is false, but otherwise the only thing that + * matters is to be memory safe. + */ + + if (DUK_HBUFOBJ_VALID_SLICE(h_bufarg1) && + DUK_HBUFOBJ_VALID_SLICE(h_bufarg2)) { + comp_res = duk_js_data_compare((const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufarg1->buf) + h_bufarg1->offset, + (const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufarg2->buf) + h_bufarg2->offset, + (duk_size_t) h_bufarg1->length, + (duk_size_t) h_bufarg2->length); + } else { + comp_res = -1; /* either nonzero value is ok */ + } + + if (magic & 0x01U) { + /* compare: similar to string comparison but for buffer data. */ + duk_push_int(thr, comp_res); + } else { + /* equals */ + duk_push_boolean(thr, (comp_res == 0)); + } + + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.prototype.fill() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_fill(duk_hthread *thr) { + duk_hbufobj *h_this; + const duk_uint8_t *fill_str_ptr; + duk_size_t fill_str_len; + duk_uint8_t fill_value; + duk_int_t fill_offset; + duk_int_t fill_end; + duk_size_t fill_length; + duk_uint8_t *p; + + h_this = duk__require_bufobj_this(thr); + DUK_ASSERT(h_this != NULL); + if (h_this->buf == NULL) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + /* [ value offset end ] */ + + if (duk_is_string_notsymbol(thr, 0)) { + fill_str_ptr = (const duk_uint8_t *) duk_get_lstring(thr, 0, &fill_str_len); + DUK_ASSERT(fill_str_ptr != NULL); + } else { + /* Symbols get ToNumber() coerced and cause TypeError. */ + fill_value = (duk_uint8_t) duk_to_uint32(thr, 0); + fill_str_ptr = (const duk_uint8_t *) &fill_value; + fill_str_len = 1; + } + + /* Fill offset handling is more lenient than in Node.js. */ + + duk__clamp_startend_nonegidx_noshift(thr, + (duk_int_t) h_this->length, + 1 /*idx_start*/, + 2 /*idx_end*/, + &fill_offset, + &fill_end); + + DUK_DDD(DUK_DDDPRINT("fill: fill_value=%02x, fill_offset=%ld, fill_end=%ld, view length=%ld", + (unsigned int) fill_value, (long) fill_offset, (long) fill_end, (long) h_this->length)); + + DUK_ASSERT(fill_end - fill_offset >= 0); + DUK_ASSERT(h_this->buf != NULL); + + p = (DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this) + fill_offset); + fill_length = (duk_size_t) (fill_end - fill_offset); + if (fill_str_len == 1) { + /* Handle single character fills as memset() even when + * the fill data comes from a one-char argument. + */ + duk_memset_unsafe((void *) p, (int) fill_str_ptr[0], (size_t) fill_length); + } else if (fill_str_len > 1) { + duk_size_t i, n, t; + + for (i = 0, n = (duk_size_t) (fill_end - fill_offset), t = 0; i < n; i++) { + p[i] = fill_str_ptr[t++]; + if (t >= fill_str_len) { + t = 0; + } + } + } else { + DUK_DDD(DUK_DDDPRINT("zero size fill pattern, ignore silently")); + } + + /* Return the Buffer to allow chaining: b.fill(0x11).fill(0x22, 3, 5).toString() */ + duk_push_this(thr); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.prototype.write(string, [offset], [length], [encoding]) + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_write(duk_hthread *thr) { + duk_hbufobj *h_this; + duk_uint_t offset; + duk_uint_t length; + const duk_uint8_t *str_data; + duk_size_t str_len; + + /* XXX: very inefficient support for plain buffers */ + h_this = duk__require_bufobj_this(thr); + DUK_ASSERT(h_this != NULL); + + /* Argument must be a string, e.g. a buffer is not allowed. */ + str_data = (const duk_uint8_t *) duk_require_lstring_notsymbol(thr, 0, &str_len); + + duk__resolve_offset_opt_length(thr, h_this, 1, 2, &offset, &length, 0 /*throw_flag*/); + DUK_ASSERT(offset <= h_this->length); + DUK_ASSERT(offset + length <= h_this->length); + + /* XXX: encoding is ignored now. */ + + if (length > str_len) { + length = (duk_uint_t) str_len; + } + + if (DUK_HBUFOBJ_VALID_SLICE(h_this)) { + /* Cannot overlap. */ + duk_memcpy_unsafe((void *) (DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this) + offset), + (const void *) str_data, + (size_t) length); + } else { + DUK_DDD(DUK_DDDPRINT("write() target buffer is not covered, silent ignore")); + } + + duk_push_uint(thr, length); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.prototype.copy() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_copy(duk_hthread *thr) { + duk_hbufobj *h_this; + duk_hbufobj *h_bufarg; + duk_int_t source_length; + duk_int_t target_length; + duk_int_t target_start, source_start, source_end; + duk_uint_t target_ustart, source_ustart, source_uend; + duk_uint_t copy_size = 0; + + /* [ targetBuffer targetStart sourceStart sourceEnd ] */ + + h_this = duk__require_bufobj_this(thr); + h_bufarg = duk__require_bufobj_value(thr, 0); + DUK_ASSERT(h_this != NULL); + DUK_ASSERT(h_bufarg != NULL); + source_length = (duk_int_t) h_this->length; + target_length = (duk_int_t) h_bufarg->length; + + target_start = duk_to_int(thr, 1); + source_start = duk_to_int(thr, 2); + if (duk_is_undefined(thr, 3)) { + source_end = source_length; + } else { + source_end = duk_to_int(thr, 3); + } + + DUK_DDD(DUK_DDDPRINT("checking copy args: target_start=%ld, target_length=%ld, " + "source_start=%ld, source_end=%ld, source_length=%ld", + (long) target_start, (long) h_bufarg->length, + (long) source_start, (long) source_end, (long) source_length)); + + /* This behavior mostly mimics Node.js now. */ + + if (source_start < 0 || source_end < 0 || target_start < 0) { + /* Negative offsets cause a RangeError. */ + goto fail_bounds; + } + source_ustart = (duk_uint_t) source_start; + source_uend = (duk_uint_t) source_end; + target_ustart = (duk_uint_t) target_start; + if (source_ustart >= source_uend || /* crossed offsets or zero size */ + source_ustart >= (duk_uint_t) source_length || /* source out-of-bounds (but positive) */ + target_ustart >= (duk_uint_t) target_length) { /* target out-of-bounds (but positive) */ + goto silent_ignore; + } + if (source_uend >= (duk_uint_t) source_length) { + /* Source end clamped silently to available length. */ + source_uend = (duk_uint_t) source_length; + } + copy_size = source_uend - source_ustart; + if (target_ustart + copy_size > (duk_uint_t) target_length) { + /* Clamp to target's end if too long. + * + * NOTE: there's no overflow possibility in the comparison; + * both target_ustart and copy_size are >= 0 and based on + * values in duk_int_t range. Adding them as duk_uint_t + * values is then guaranteed not to overflow. + */ + DUK_ASSERT(target_ustart + copy_size >= target_ustart); /* no overflow */ + DUK_ASSERT(target_ustart + copy_size >= copy_size); /* no overflow */ + copy_size = (duk_uint_t) target_length - target_ustart; + } + + DUK_DDD(DUK_DDDPRINT("making copy: target_ustart=%lu source_ustart=%lu copy_size=%lu", + (unsigned long) target_ustart, (unsigned long) source_ustart, + (unsigned long) copy_size)); + + DUK_ASSERT(copy_size >= 1); + DUK_ASSERT(source_ustart <= (duk_uint_t) source_length); + DUK_ASSERT(source_ustart + copy_size <= (duk_uint_t) source_length); + DUK_ASSERT(target_ustart <= (duk_uint_t) target_length); + DUK_ASSERT(target_ustart + copy_size <= (duk_uint_t) target_length); + + /* Ensure copy is covered by underlying buffers. */ + DUK_ASSERT(h_bufarg->buf != NULL); /* length check */ + DUK_ASSERT(h_this->buf != NULL); /* length check */ + if (DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_bufarg, target_ustart + copy_size) && + DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_this, source_ustart + copy_size)) { + /* Must use memmove() because copy area may overlap (source and target + * buffer may be the same, or from different slices. + */ + duk_memmove_unsafe((void *) (DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufarg) + target_ustart), + (const void *) (DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this) + source_ustart), + (size_t) copy_size); + } else { + DUK_DDD(DUK_DDDPRINT("buffer copy not covered by underlying buffer(s), ignoring")); + } + + silent_ignore: + /* Return value is like write(), number of bytes written. + * The return value matters because of code like: + * "off += buf.copy(...)". + */ + duk_push_uint(thr, copy_size); + return 1; + + fail_bounds: + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * TypedArray.prototype.set() + * + * TypedArray set() is pretty interesting to implement because: + * + * - The source argument may be a plain array or a typedarray. If the + * source is a TypedArray, values are decoded and re-encoded into the + * target (not as a plain byte copy). This may happen even when the + * element byte size is the same, e.g. integer values may be re-encoded + * into floats. + * + * - Source and target may refer to the same underlying buffer, so that + * the set() operation may overlap. The specification requires that this + * must work as if a copy was made before the operation. Note that this + * is NOT a simple memmove() situation because the source and target + * byte sizes may be different -- e.g. a 4-byte source (Int8Array) may + * expand to a 16-byte target (Uint32Array) so that the target overlaps + * the source both from beginning and the end (unlike in typical memmove). + * + * - Even if 'buf' pointers of the source and target differ, there's no + * guarantee that their memory areas don't overlap. This may be the + * case with external buffers. + * + * Even so, it is nice to optimize for the common case: + * + * - Source and target separate buffers or non-overlapping. + * + * - Source and target have a compatible type so that a plain byte copy + * is possible. Note that while e.g. uint8 and int8 are compatible + * (coercion one way or another doesn't change the byte representation), + * e.g. int8 and uint8clamped are NOT compatible when writing int8 + * values into uint8clamped typedarray (-1 would clamp to 0 for instance). + * + * See test-bi-typedarray-proto-set.js. + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_typedarray_set(duk_hthread *thr) { + duk_hbufobj *h_this; + duk_hobject *h_obj; + duk_uarridx_t i, n; + duk_int_t offset_signed; + duk_uint_t offset_elems; + duk_uint_t offset_bytes; + + h_this = duk__require_bufobj_this(thr); + DUK_ASSERT(h_this != NULL); + DUK_ASSERT_HBUFOBJ_VALID(h_this); + + if (h_this->buf == NULL) { + DUK_DDD(DUK_DDDPRINT("source neutered, skip copy")); + return 0; + } + + duk_hbufobj_promote_plain(thr, 0); + h_obj = duk_require_hobject(thr, 0); + + /* XXX: V8 throws a TypeError for negative values. Would it + * be more useful to interpret negative offsets here from the + * end of the buffer too? + */ + offset_signed = duk_to_int(thr, 1); + if (offset_signed < 0) { + /* For some reason this is a TypeError (at least in V8). */ + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + offset_elems = (duk_uint_t) offset_signed; + offset_bytes = offset_elems << h_this->shift; + if ((offset_bytes >> h_this->shift) != offset_elems) { + /* Byte length would overflow. */ + /* XXX: easier check with less code? */ + goto fail_args; + } + if (offset_bytes > h_this->length) { + /* Equality may be OK but >length not. Checking + * this explicitly avoids some overflow cases + * below. + */ + goto fail_args; + } + DUK_ASSERT(offset_bytes <= h_this->length); + + /* Fast path: source is a TypedArray (or any bufobj). */ + + if (DUK_HOBJECT_IS_BUFOBJ(h_obj)) { + duk_hbufobj *h_bufarg; +#if !defined(DUK_USE_PREFER_SIZE) + duk_uint16_t comp_mask; +#endif + duk_small_int_t no_overlap = 0; + duk_uint_t src_length; + duk_uint_t dst_length; + duk_uint_t dst_length_elems; + duk_uint8_t *p_src_base; + duk_uint8_t *p_src_end; + duk_uint8_t *p_src; + duk_uint8_t *p_dst_base; + duk_uint8_t *p_dst; + duk_small_uint_t src_elem_size; + duk_small_uint_t dst_elem_size; + + h_bufarg = (duk_hbufobj *) h_obj; + DUK_ASSERT_HBUFOBJ_VALID(h_bufarg); + + if (h_bufarg->buf == NULL) { + DUK_DDD(DUK_DDDPRINT("target neutered, skip copy")); + return 0; + } + + /* Nominal size check. */ + src_length = h_bufarg->length; /* bytes in source */ + dst_length_elems = (src_length >> h_bufarg->shift); /* elems in source and dest */ + dst_length = dst_length_elems << h_this->shift; /* bytes in dest */ + if ((dst_length >> h_this->shift) != dst_length_elems) { + /* Byte length would overflow. */ + /* XXX: easier check with less code? */ + goto fail_args; + } + DUK_DDD(DUK_DDDPRINT("nominal size check: src_length=%ld, dst_length=%ld", + (long) src_length, (long) dst_length)); + DUK_ASSERT(offset_bytes <= h_this->length); + if (dst_length > h_this->length - offset_bytes) { + /* Overflow not an issue because subtraction is used on the right + * side and guaranteed to be >= 0. + */ + DUK_DDD(DUK_DDDPRINT("copy exceeds target buffer nominal length")); + goto fail_args; + } + if (!DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_this, offset_bytes + dst_length)) { + DUK_DDD(DUK_DDDPRINT("copy not covered by underlying target buffer, ignore")); + return 0; + } + + p_src_base = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufarg); + p_dst_base = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this) + offset_bytes; + + /* Check actual underlying buffers for validity and that they + * cover the copy. No side effects are allowed after the check + * so that the validity status doesn't change. + */ + if (!DUK_HBUFOBJ_VALID_SLICE(h_this) || + !DUK_HBUFOBJ_VALID_SLICE(h_bufarg)) { + /* The condition could be more narrow and check for the + * copy area only, but there's no need for fine grained + * behavior when the underlying buffer is misconfigured. + */ + DUK_DDD(DUK_DDDPRINT("source and/or target not covered by underlying buffer, skip copy")); + return 0; + } + + /* We want to do a straight memory copy if possible: this is + * an important operation because .set() is the TypedArray + * way to copy chunks of memory. However, because set() + * conceptually works in terms of elements, not all views are + * compatible with direct byte copying. + * + * If we do manage a direct copy, the "overlap issue" handled + * below can just be solved using memmove() because the source + * and destination element sizes are necessarily equal. + */ + +#if !defined(DUK_USE_PREFER_SIZE) + DUK_ASSERT(h_this->elem_type < sizeof(duk__buffer_elemtype_copy_compatible) / sizeof(duk_uint16_t)); + comp_mask = duk__buffer_elemtype_copy_compatible[h_this->elem_type]; + if (comp_mask & (1 << h_bufarg->elem_type)) { + DUK_ASSERT(src_length == dst_length); + + DUK_DDD(DUK_DDDPRINT("fast path: able to use memmove() because views are compatible")); + duk_memmove_unsafe((void *) p_dst_base, (const void *) p_src_base, (size_t) dst_length); + return 0; + } + DUK_DDD(DUK_DDDPRINT("fast path: views are not compatible with a byte copy, copy by item")); +#endif /* !DUK_USE_PREFER_SIZE */ + + /* We want to avoid making a copy to process set() but that's + * not always possible: the source and the target may overlap + * and because element sizes are different, the overlap cannot + * always be handled with a memmove() or choosing the copy + * direction in a certain way. For example, if source type is + * uint8 and target type is uint32, the target area may exceed + * the source area from both ends! + * + * Note that because external buffers may point to the same + * memory areas, we must ultimately make this check using + * pointers. + * + * NOTE: careful with side effects: any side effect may cause + * a buffer resize (or external buffer pointer/length update)! + */ + + DUK_DDD(DUK_DDDPRINT("overlap check: p_src_base=%p, src_length=%ld, " + "p_dst_base=%p, dst_length=%ld", + (void *) p_src_base, (long) src_length, + (void *) p_dst_base, (long) dst_length)); + + if (p_src_base >= p_dst_base + dst_length || /* source starts after dest ends */ + p_src_base + src_length <= p_dst_base) { /* source ends before dest starts */ + no_overlap = 1; + } + + if (!no_overlap) { + /* There's overlap: the desired end result is that + * conceptually a copy is made to avoid "trampling" + * of source data by destination writes. We make + * an actual temporary copy to handle this case. + */ + duk_uint8_t *p_src_copy; + + DUK_DDD(DUK_DDDPRINT("there is overlap, make a copy of the source")); + p_src_copy = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, src_length); + DUK_ASSERT(p_src_copy != NULL); + duk_memcpy_unsafe((void *) p_src_copy, (const void *) p_src_base, (size_t) src_length); + + p_src_base = p_src_copy; /* use p_src_base from now on */ + } + /* Value stack intentionally mixed size here. */ + + DUK_DDD(DUK_DDDPRINT("after overlap check: p_src_base=%p, src_length=%ld, " + "p_dst_base=%p, dst_length=%ld, valstack top=%ld", + (void *) p_src_base, (long) src_length, + (void *) p_dst_base, (long) dst_length, + (long) duk_get_top(thr))); + + /* Ready to make the copy. We must proceed element by element + * and must avoid any side effects that might cause the buffer + * validity check above to become invalid. + * + * Although we work through the value stack here, only plain + * numbers are handled which should be side effect safe. + */ + + src_elem_size = (duk_small_uint_t) (1U << h_bufarg->shift); + dst_elem_size = (duk_small_uint_t) (1U << h_this->shift); + p_src = p_src_base; + p_dst = p_dst_base; + p_src_end = p_src_base + src_length; + + while (p_src != p_src_end) { + DUK_DDD(DUK_DDDPRINT("fast path per element copy loop: " + "p_src=%p, p_src_end=%p, p_dst=%p", + (void *) p_src, (void *) p_src_end, (void *) p_dst)); + /* A validated read() is always a number, so it's write coercion + * is always side effect free an won't invalidate pointers etc. + */ + duk_hbufobj_push_validated_read(thr, h_bufarg, p_src, src_elem_size); + duk_hbufobj_validated_write(thr, h_this, p_dst, dst_elem_size); + duk_pop(thr); + p_src += src_elem_size; + p_dst += dst_elem_size; + } + + return 0; + } else { + /* Slow path: quite slow, but we save space by using the property code + * to write coerce target values. We don't need to worry about overlap + * here because the source is not a TypedArray. + * + * We could use the bufobj write coercion helper but since the + * property read may have arbitrary side effects, full validity checks + * would be needed for every element anyway. + */ + + n = (duk_uarridx_t) duk_get_length(thr, 0); + DUK_ASSERT(offset_bytes <= h_this->length); + if ((n << h_this->shift) > h_this->length - offset_bytes) { + /* Overflow not an issue because subtraction is used on the right + * side and guaranteed to be >= 0. + */ + DUK_DDD(DUK_DDDPRINT("copy exceeds target buffer nominal length")); + goto fail_args; + } + + /* There's no need to check for buffer validity status for the + * target here: the property access code will do that for each + * element. Moreover, if we did check the validity here, side + * effects from reading the source argument might invalidate + * the results anyway. + */ + + DUK_ASSERT_TOP(thr, 2); + duk_push_this(thr); + + for (i = 0; i < n; i++) { + duk_get_prop_index(thr, 0, i); + duk_put_prop_index(thr, 2, offset_elems + i); + } + } + + return 0; + + fail_args: + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.prototype.slice([start], [end]) + * ArrayBuffer.prototype.slice(begin, [end]) + * TypedArray.prototype.subarray(begin, [end]) + * + * The API calls are almost identical; negative indices are counted from end + * of buffer, and final indices are clamped (allowing crossed indices). Main + * differences: + * + * - Copy/view behavior; Node.js .slice() and TypedArray .subarray() create + * views, ArrayBuffer .slice() creates a copy + * + * - Resulting object has a different class and prototype depending on the + * call (or 'this' argument) + * + * - TypedArray .subarray() arguments are element indices, not byte offsets + * + * - Plain buffer argument creates a plain buffer slice + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_LOCAL void duk__arraybuffer_plain_slice(duk_hthread *thr, duk_hbuffer *h_val) { + duk_int_t start_offset, end_offset; + duk_uint_t slice_length; + duk_uint8_t *p_copy; + duk_size_t copy_length; + + duk__clamp_startend_negidx_shifted(thr, + (duk_int_t) DUK_HBUFFER_GET_SIZE(h_val), + 0 /*buffer_shift*/, + 0 /*idx_start*/, + 1 /*idx_end*/, + &start_offset, + &end_offset); + DUK_ASSERT(end_offset <= (duk_int_t) DUK_HBUFFER_GET_SIZE(h_val)); + DUK_ASSERT(start_offset >= 0); + DUK_ASSERT(end_offset >= start_offset); + slice_length = (duk_uint_t) (end_offset - start_offset); + + p_copy = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, (duk_size_t) slice_length); + DUK_ASSERT(p_copy != NULL); + copy_length = slice_length; + + duk_memcpy_unsafe((void *) p_copy, + (const void *) ((duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_val) + start_offset), + copy_length); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +/* Shared helper for slice/subarray operation. + * Magic: 0x01=isView, 0x02=copy, 0x04=Node.js Buffer special handling. + */ +DUK_INTERNAL duk_ret_t duk_bi_buffer_slice_shared(duk_hthread *thr) { + duk_small_int_t magic; + duk_small_uint_t res_class_num; + duk_small_int_t res_proto_bidx; + duk_hbufobj *h_this; + duk_hbufobj *h_bufobj; + duk_hbuffer *h_val; + duk_int_t start_offset, end_offset; + duk_uint_t slice_length; + duk_tval *tv; + + /* [ start end ] */ + + magic = duk_get_current_magic(thr); + + tv = duk_get_borrowed_this_tval(thr); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_BUFFER(tv)) { + /* For plain buffers return a plain buffer slice. */ + h_val = DUK_TVAL_GET_BUFFER(tv); + DUK_ASSERT(h_val != NULL); + + if (magic & 0x02) { + /* Make copy: ArrayBuffer.prototype.slice() uses this. */ + duk__arraybuffer_plain_slice(thr, h_val); + return 1; + } else { + /* View into existing buffer: cannot be done if the + * result is a plain buffer because there's no slice + * info. So return an ArrayBuffer instance; coerce + * the 'this' binding into an object and behave as if + * the original call was for an Object-coerced plain + * buffer (handled automatically by duk__require_bufobj_this()). + */ + + DUK_DDD(DUK_DDDPRINT("slice() doesn't handle view into plain buffer, coerce 'this' to ArrayBuffer object")); + /* fall through */ + } + } + tv = NULL; /* No longer valid nor needed. */ + + h_this = duk__require_bufobj_this(thr); + + /* Slice offsets are element (not byte) offsets, which only matters + * for TypedArray views, Node.js Buffer and ArrayBuffer have shift + * zero so byte and element offsets are the same. Negative indices + * are counted from end of slice, crossed indices are allowed (and + * result in zero length result), and final values are clamped + * against the current slice. There's intentionally no check + * against the underlying buffer here. + */ + + duk__clamp_startend_negidx_shifted(thr, + (duk_int_t) h_this->length, + (duk_uint8_t) h_this->shift, + 0 /*idx_start*/, + 1 /*idx_end*/, + &start_offset, + &end_offset); + DUK_ASSERT(end_offset >= start_offset); + DUK_ASSERT(start_offset >= 0); + DUK_ASSERT(end_offset >= 0); + slice_length = (duk_uint_t) (end_offset - start_offset); + + /* The resulting buffer object gets the same class and prototype as + * the buffer in 'this', e.g. if the input is a Uint8Array the + * result is a Uint8Array; if the input is a Float32Array, the + * result is a Float32Array. The result internal prototype should + * be the default prototype for the class (e.g. initial value of + * Uint8Array.prototype), not copied from the argument (Duktape 1.x + * did that). + * + * Node.js Buffers have special handling: they're Uint8Arrays as far + * as the internal class is concerned, so the new Buffer should also + * be an Uint8Array but inherit from Buffer.prototype. + */ + res_class_num = DUK_HOBJECT_GET_CLASS_NUMBER((duk_hobject *) h_this); + DUK_ASSERT(res_class_num >= DUK_HOBJECT_CLASS_BUFOBJ_MIN); /* type check guarantees */ + DUK_ASSERT(res_class_num <= DUK_HOBJECT_CLASS_BUFOBJ_MAX); + res_proto_bidx = duk__buffer_proto_from_classnum[res_class_num - DUK_HOBJECT_CLASS_BUFOBJ_MIN]; + if (magic & 0x04) { + res_proto_bidx = DUK_BIDX_NODEJS_BUFFER_PROTOTYPE; + } + h_bufobj = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(res_class_num), + res_proto_bidx); + DUK_ASSERT(h_bufobj != NULL); + + DUK_ASSERT(h_bufobj->length == 0); + h_bufobj->shift = h_this->shift; /* inherit */ + h_bufobj->elem_type = h_this->elem_type; /* inherit */ + h_bufobj->is_typedarray = magic & 0x01; + DUK_ASSERT(h_bufobj->is_typedarray == 0 || h_bufobj->is_typedarray == 1); + + h_val = h_this->buf; + if (h_val == NULL) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + if (magic & 0x02) { + /* non-zero: make copy */ + duk_uint8_t *p_copy; + duk_size_t copy_length; + + p_copy = (duk_uint8_t *) duk_push_fixed_buffer_zero(thr, (duk_size_t) slice_length); /* must be zeroed, not all bytes always copied */ + DUK_ASSERT(p_copy != NULL); + + /* Copy slice, respecting underlying buffer limits; remainder + * is left as zero. + */ + copy_length = DUK_HBUFOBJ_CLAMP_BYTELENGTH(h_this, slice_length); + duk_memcpy_unsafe((void *) p_copy, + (const void *) (DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this) + start_offset), + copy_length); + + h_val = duk_known_hbuffer(thr, -1); + + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + h_bufobj->length = slice_length; + DUK_ASSERT(h_bufobj->offset == 0); + + duk_pop(thr); /* reachable so pop OK */ + } else { + h_bufobj->buf = h_val; + DUK_HBUFFER_INCREF(thr, h_val); + h_bufobj->length = slice_length; + h_bufobj->offset = h_this->offset + (duk_uint_t) start_offset; + + /* Copy the .buffer property, needed for TypedArray.prototype.subarray(). + * + * XXX: limit copy only for TypedArray classes specifically? + */ + + DUK_ASSERT(h_bufobj->buf_prop == NULL); + h_bufobj->buf_prop = h_this->buf_prop; /* may be NULL */ + DUK_HOBJECT_INCREF_ALLOWNULL(thr, (duk_hobject *) h_bufobj->buf_prop); + } + /* unbalanced stack on purpose */ + + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.isEncoding() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_is_encoding(duk_hthread *thr) { + const char *encoding; + + /* only accept lowercase 'utf8' now. */ + + encoding = duk_to_string(thr, 0); + DUK_ASSERT(duk_is_string(thr, 0)); /* guaranteed by duk_to_string() */ + duk_push_boolean(thr, DUK_STRCMP(encoding, "utf8") == 0); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.isBuffer() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_is_buffer(duk_hthread *thr) { + duk_hobject *h; + duk_hobject *h_proto; + duk_bool_t ret = 0; + + DUK_ASSERT(duk_get_top(thr) >= 1); /* nargs */ + h = duk_get_hobject(thr, 0); + if (h != NULL) { + h_proto = thr->builtins[DUK_BIDX_NODEJS_BUFFER_PROTOTYPE]; + DUK_ASSERT(h_proto != NULL); + + h = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h); + if (h != NULL) { + ret = duk_hobject_prototype_chain_contains(thr, h, h_proto, 0 /*ignore_loop*/); + } + } + + duk_push_boolean(thr, ret); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.byteLength() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_byte_length(duk_hthread *thr) { + const char *str; + duk_size_t len; + + /* At the moment Buffer(<str>) will just use the string bytes as + * is (ignoring encoding), so we return the string length here + * unconditionally. + */ + + /* XXX: to be revised; Old Node.js behavior just coerces any buffer + * values to string: + * $ node + * > Buffer.byteLength(new Uint32Array(10)) + * 20 + * > Buffer.byteLength(new Uint32Array(100)) + * 20 + * (The 20 comes from '[object Uint32Array]'.length + */ + + str = duk_to_lstring(thr, 0, &len); + DUK_UNREF(str); + duk_push_size_t(thr, len); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Node.js Buffer.concat() + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_concat(duk_hthread *thr) { + duk_hobject *h_arg; + duk_uint_t total_length; + duk_hbufobj *h_bufobj; + duk_hbufobj *h_bufres; + duk_hbuffer *h_val; + duk_uint_t i, n; + duk_uint8_t *p; + duk_size_t space_left; + duk_size_t copy_size; + + /* Node.js accepts only actual Arrays. */ + h_arg = duk_require_hobject(thr, 0); + if (DUK_HOBJECT_GET_CLASS_NUMBER(h_arg) != DUK_HOBJECT_CLASS_ARRAY) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + /* Compute result length and validate argument buffers. */ + n = (duk_uint_t) duk_get_length(thr, 0); + total_length = 0; + for (i = 0; i < n; i++) { + /* Neutered checks not necessary here: neutered buffers have + * zero 'length' so we'll effectively skip them. + */ + DUK_ASSERT_TOP(thr, 2); /* [ array totalLength ] */ + duk_get_prop_index(thr, 0, (duk_uarridx_t) i); /* -> [ array totalLength buf ] */ + h_bufobj = duk__require_bufobj_value(thr, 2); + DUK_ASSERT(h_bufobj != NULL); + total_length += h_bufobj->length; + if (DUK_UNLIKELY(total_length < h_bufobj->length)) { + DUK_DCERROR_RANGE_INVALID_ARGS(thr); /* Wrapped. */ + } + duk_pop(thr); + } + /* In Node.js v0.12.1 a 1-element array is special and won't create a + * copy, this was fixed later so an explicit check no longer needed. + */ + + /* User totalLength overrides a computed length, but we'll check + * every copy in the copy loop. Note that duk_to_int() can + * technically have arbitrary side effects so we need to recheck + * the buffers in the copy loop. + */ + if (!duk_is_undefined(thr, 1) && n > 0) { + /* For n == 0, Node.js ignores totalLength argument and + * returns a zero length buffer. + */ + duk_int_t total_length_signed; + total_length_signed = duk_to_int(thr, 1); + if (total_length_signed < 0) { + DUK_DCERROR_RANGE_INVALID_ARGS(thr); + } + total_length = (duk_uint_t) total_length_signed; + } + + h_bufres = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_UINT8ARRAY), + DUK_BIDX_NODEJS_BUFFER_PROTOTYPE); + DUK_ASSERT(h_bufres != NULL); + + p = (duk_uint8_t *) duk_push_fixed_buffer_zero(thr, total_length); /* must be zeroed, all bytes not necessarily written over */ + DUK_ASSERT(p != NULL); + space_left = (duk_size_t) total_length; + + for (i = 0; i < n; i++) { + DUK_ASSERT_TOP(thr, 4); /* [ array totalLength bufres buf ] */ + + duk_get_prop_index(thr, 0, (duk_uarridx_t) i); + h_bufobj = duk__require_bufobj_value(thr, 4); + DUK_ASSERT(h_bufobj != NULL); + + copy_size = h_bufobj->length; + if (copy_size > space_left) { + copy_size = space_left; + } + + if (h_bufobj->buf != NULL && + DUK_HBUFOBJ_VALID_SLICE(h_bufobj)) { + duk_memcpy_unsafe((void *) p, + (const void *) DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_bufobj), + copy_size); + } else { + /* Just skip, leaving zeroes in the result. */ + ; + } + p += copy_size; + space_left -= copy_size; + + duk_pop(thr); + } + + h_val = duk_known_hbuffer(thr, -1); + + duk__set_bufobj_buffer(thr, h_bufres, h_val); + h_bufres->is_typedarray = 1; + DUK_ASSERT_HBUFOBJ_VALID(h_bufres); + + duk_pop(thr); /* pop plain buffer, now reachable through h_bufres */ + + return 1; /* return h_bufres */ +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Shared readfield and writefield methods + * + * The readfield/writefield methods need support for endianness and field + * types. All offsets are byte based so no offset shifting is needed. + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +/* Format of magic, bits: + * 0...1: field type; 0=uint8, 1=uint16, 2=uint32, 3=float, 4=double, 5=unused, 6=unused, 7=unused + * 3: endianness: 0=little, 1=big + * 4: signed: 1=yes, 0=no + * 5: typedarray: 1=yes, 0=no + */ +#define DUK__FLD_8BIT 0 +#define DUK__FLD_16BIT 1 +#define DUK__FLD_32BIT 2 +#define DUK__FLD_FLOAT 3 +#define DUK__FLD_DOUBLE 4 +#define DUK__FLD_VARINT 5 +#define DUK__FLD_BIGENDIAN (1 << 3) +#define DUK__FLD_SIGNED (1 << 4) +#define DUK__FLD_TYPEDARRAY (1 << 5) + +/* XXX: split into separate functions for each field type? */ +DUK_INTERNAL duk_ret_t duk_bi_buffer_readfield(duk_hthread *thr) { + duk_small_int_t magic = (duk_small_int_t) duk_get_current_magic(thr); + duk_small_int_t magic_ftype; + duk_small_int_t magic_bigendian; + duk_small_int_t magic_signed; + duk_small_int_t magic_typedarray; + duk_small_int_t endswap; + duk_hbufobj *h_this; + duk_bool_t no_assert; + duk_int_t offset_signed; + duk_uint_t offset; + duk_uint_t buffer_length; + duk_uint_t check_length; + duk_uint8_t *buf; + duk_double_union du; + + magic_ftype = magic & 0x0007; + magic_bigendian = magic & 0x0008; + magic_signed = magic & 0x0010; + magic_typedarray = magic & 0x0020; + + h_this = duk__require_bufobj_this(thr); /* XXX: very inefficient for plain buffers */ + DUK_ASSERT(h_this != NULL); + buffer_length = h_this->length; + + /* [ offset noAssert ], when ftype != DUK__FLD_VARINT */ + /* [ offset fieldByteLength noAssert ], when ftype == DUK__FLD_VARINT */ + /* [ offset littleEndian ], when DUK__FLD_TYPEDARRAY (regardless of ftype) */ + + /* Handle TypedArray vs. Node.js Buffer arg differences */ + if (magic_typedarray) { + no_assert = 0; +#if defined(DUK_USE_INTEGER_LE) + endswap = !duk_to_boolean(thr, 1); /* 1=little endian */ +#else + endswap = duk_to_boolean(thr, 1); /* 1=little endian */ +#endif + } else { + no_assert = duk_to_boolean(thr, (magic_ftype == DUK__FLD_VARINT) ? 2 : 1); +#if defined(DUK_USE_INTEGER_LE) + endswap = magic_bigendian; +#else + endswap = !magic_bigendian; +#endif + } + + /* Offset is coerced first to signed integer range and then to unsigned. + * This ensures we can add a small byte length (1-8) to the offset in + * bound checks and not wrap. + */ + offset_signed = duk_to_int(thr, 0); + offset = (duk_uint_t) offset_signed; + if (offset_signed < 0) { + goto fail_bounds; + } + + DUK_DDD(DUK_DDDPRINT("readfield, buffer_length=%ld, offset=%ld, no_assert=%d, " + "magic=%04x, magic_fieldtype=%d, magic_bigendian=%d, magic_signed=%d, " + "endswap=%d", + (long) buffer_length, (long) offset, (int) no_assert, + (unsigned int) magic, (int) magic_ftype, (int) (magic_bigendian >> 3), + (int) (magic_signed >> 4), (int) endswap)); + + /* Update 'buffer_length' to be the effective, safe limit which + * takes into account the underlying buffer. This value will be + * potentially invalidated by any side effect. + */ + check_length = DUK_HBUFOBJ_CLAMP_BYTELENGTH(h_this, buffer_length); + DUK_DDD(DUK_DDDPRINT("buffer_length=%ld, check_length=%ld", + (long) buffer_length, (long) check_length)); + + if (h_this->buf) { + buf = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this); + } else { + /* Neutered. We could go into the switch-case safely with + * buf == NULL because check_length == 0. To avoid scanbuild + * warnings, fail directly instead. + */ + DUK_ASSERT(check_length == 0); + goto fail_neutered; + } + DUK_ASSERT(buf != NULL); + + switch (magic_ftype) { + case DUK__FLD_8BIT: { + duk_uint8_t tmp; + if (offset + 1U > check_length) { + goto fail_bounds; + } + tmp = buf[offset]; + if (magic_signed) { + duk_push_int(thr, (duk_int_t) ((duk_int8_t) tmp)); + } else { + duk_push_uint(thr, (duk_uint_t) tmp); + } + break; + } + case DUK__FLD_16BIT: { + duk_uint16_t tmp; + if (offset + 2U > check_length) { + goto fail_bounds; + } + duk_memcpy((void *) du.uc, (const void *) (buf + offset), 2); + tmp = du.us[0]; + if (endswap) { + tmp = DUK_BSWAP16(tmp); + } + if (magic_signed) { + duk_push_int(thr, (duk_int_t) ((duk_int16_t) tmp)); + } else { + duk_push_uint(thr, (duk_uint_t) tmp); + } + break; + } + case DUK__FLD_32BIT: { + duk_uint32_t tmp; + if (offset + 4U > check_length) { + goto fail_bounds; + } + duk_memcpy((void *) du.uc, (const void *) (buf + offset), 4); + tmp = du.ui[0]; + if (endswap) { + tmp = DUK_BSWAP32(tmp); + } + if (magic_signed) { + duk_push_int(thr, (duk_int_t) ((duk_int32_t) tmp)); + } else { + duk_push_uint(thr, (duk_uint_t) tmp); + } + break; + } + case DUK__FLD_FLOAT: { + duk_uint32_t tmp; + if (offset + 4U > check_length) { + goto fail_bounds; + } + duk_memcpy((void *) du.uc, (const void *) (buf + offset), 4); + if (endswap) { + tmp = du.ui[0]; + tmp = DUK_BSWAP32(tmp); + du.ui[0] = tmp; + } + duk_push_number(thr, (duk_double_t) du.f[0]); + break; + } + case DUK__FLD_DOUBLE: { + if (offset + 8U > check_length) { + goto fail_bounds; + } + duk_memcpy((void *) du.uc, (const void *) (buf + offset), 8); + if (endswap) { + DUK_DBLUNION_BSWAP64(&du); + } + duk_push_number(thr, (duk_double_t) du.d); + break; + } + case DUK__FLD_VARINT: { + /* Node.js Buffer variable width integer field. We don't really + * care about speed here, so aim for shortest algorithm. + */ + duk_int_t field_bytelen; + duk_int_t i, i_step, i_end; +#if defined(DUK_USE_64BIT_OPS) + duk_int64_t tmp; + duk_small_uint_t shift_tmp; +#else + duk_double_t tmp; + duk_small_int_t highbyte; +#endif + const duk_uint8_t *p; + + field_bytelen = duk_get_int(thr, 1); /* avoid side effects! */ + if (field_bytelen < 1 || field_bytelen > 6) { + goto fail_field_length; + } + if (offset + (duk_uint_t) field_bytelen > check_length) { + goto fail_bounds; + } + p = (const duk_uint8_t *) (buf + offset); + + /* Slow gathering of value using either 64-bit arithmetic + * or IEEE doubles if 64-bit types not available. Handling + * of negative numbers is a bit non-obvious in both cases. + */ + + if (magic_bigendian) { + /* Gather in big endian */ + i = 0; + i_step = 1; + i_end = field_bytelen; /* one i_step over */ + } else { + /* Gather in little endian */ + i = field_bytelen - 1; + i_step = -1; + i_end = -1; /* one i_step over */ + } + +#if defined(DUK_USE_64BIT_OPS) + tmp = 0; + do { + DUK_ASSERT(i >= 0 && i < field_bytelen); + tmp = (tmp << 8) + (duk_int64_t) p[i]; + i += i_step; + } while (i != i_end); + + if (magic_signed) { + /* Shift to sign extend. Left shift must be unsigned + * to avoid undefined behavior; right shift must be + * signed to sign extend properly. + */ + shift_tmp = (duk_small_uint_t) (64U - (duk_small_uint_t) field_bytelen * 8U); + tmp = (duk_int64_t) ((duk_uint64_t) tmp << shift_tmp) >> shift_tmp; + } + + duk_push_i64(thr, tmp); +#else + highbyte = p[i]; + if (magic_signed && (highbyte & 0x80) != 0) { + /* 0xff => 255 - 256 = -1; 0x80 => 128 - 256 = -128 */ + tmp = (duk_double_t) (highbyte - 256); + } else { + tmp = (duk_double_t) highbyte; + } + for (;;) { + i += i_step; + if (i == i_end) { + break; + } + DUK_ASSERT(i >= 0 && i < field_bytelen); + tmp = (tmp * 256.0) + (duk_double_t) p[i]; + } + + duk_push_number(thr, tmp); +#endif + break; + } + default: { /* should never happen but default here */ + goto fail_bounds; + } + } + + return 1; + + fail_neutered: + fail_field_length: + fail_bounds: + if (no_assert) { + /* Node.js return value for noAssert out-of-bounds reads is + * usually (but not always) NaN. Return NaN consistently. + */ + duk_push_nan(thr); + return 1; + } + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +/* XXX: split into separate functions for each field type? */ +DUK_INTERNAL duk_ret_t duk_bi_buffer_writefield(duk_hthread *thr) { + duk_small_int_t magic = (duk_small_int_t) duk_get_current_magic(thr); + duk_small_int_t magic_ftype; + duk_small_int_t magic_bigendian; + duk_small_int_t magic_signed; + duk_small_int_t magic_typedarray; + duk_small_int_t endswap; + duk_hbufobj *h_this; + duk_bool_t no_assert; + duk_int_t offset_signed; + duk_uint_t offset; + duk_uint_t buffer_length; + duk_uint_t check_length; + duk_uint8_t *buf; + duk_double_union du; + duk_int_t nbytes = 0; + + magic_ftype = magic & 0x0007; + magic_bigendian = magic & 0x0008; + magic_signed = magic & 0x0010; + magic_typedarray = magic & 0x0020; + DUK_UNREF(magic_signed); + + h_this = duk__require_bufobj_this(thr); /* XXX: very inefficient for plain buffers */ + DUK_ASSERT(h_this != NULL); + buffer_length = h_this->length; + + /* [ value offset noAssert ], when ftype != DUK__FLD_VARINT */ + /* [ value offset fieldByteLength noAssert ], when ftype == DUK__FLD_VARINT */ + /* [ offset value littleEndian ], when DUK__FLD_TYPEDARRAY (regardless of ftype) */ + + /* Handle TypedArray vs. Node.js Buffer arg differences */ + if (magic_typedarray) { + no_assert = 0; +#if defined(DUK_USE_INTEGER_LE) + endswap = !duk_to_boolean(thr, 2); /* 1=little endian */ +#else + endswap = duk_to_boolean(thr, 2); /* 1=little endian */ +#endif + duk_swap(thr, 0, 1); /* offset/value order different from Node.js */ + } else { + no_assert = duk_to_boolean(thr, (magic_ftype == DUK__FLD_VARINT) ? 3 : 2); +#if defined(DUK_USE_INTEGER_LE) + endswap = magic_bigendian; +#else + endswap = !magic_bigendian; +#endif + } + + /* Offset is coerced first to signed integer range and then to unsigned. + * This ensures we can add a small byte length (1-8) to the offset in + * bound checks and not wrap. + */ + offset_signed = duk_to_int(thr, 1); + offset = (duk_uint_t) offset_signed; + + /* We need 'nbytes' even for a failed offset; return value must be + * (offset + nbytes) even when write fails due to invalid offset. + */ + if (magic_ftype != DUK__FLD_VARINT) { + DUK_ASSERT(magic_ftype >= 0 && magic_ftype < (duk_small_int_t) (sizeof(duk__buffer_nbytes_from_fldtype) / sizeof(duk_uint8_t))); + nbytes = duk__buffer_nbytes_from_fldtype[magic_ftype]; + } else { + nbytes = duk_get_int(thr, 2); + if (nbytes < 1 || nbytes > 6) { + goto fail_field_length; + } + } + DUK_ASSERT(nbytes >= 1 && nbytes <= 8); + + /* Now we can check offset validity. */ + if (offset_signed < 0) { + goto fail_bounds; + } + + DUK_DDD(DUK_DDDPRINT("writefield, value=%!T, buffer_length=%ld, offset=%ld, no_assert=%d, " + "magic=%04x, magic_fieldtype=%d, magic_bigendian=%d, magic_signed=%d, " + "endswap=%d", + duk_get_tval(thr, 0), (long) buffer_length, (long) offset, (int) no_assert, + (unsigned int) magic, (int) magic_ftype, (int) (magic_bigendian >> 3), + (int) (magic_signed >> 4), (int) endswap)); + + /* Coerce value to a number before computing check_length, so that + * the field type specific coercion below can't have side effects + * that would invalidate check_length. + */ + duk_to_number(thr, 0); + + /* Update 'buffer_length' to be the effective, safe limit which + * takes into account the underlying buffer. This value will be + * potentially invalidated by any side effect. + */ + check_length = DUK_HBUFOBJ_CLAMP_BYTELENGTH(h_this, buffer_length); + DUK_DDD(DUK_DDDPRINT("buffer_length=%ld, check_length=%ld", + (long) buffer_length, (long) check_length)); + + if (h_this->buf) { + buf = DUK_HBUFOBJ_GET_SLICE_BASE(thr->heap, h_this); + } else { + /* Neutered. We could go into the switch-case safely with + * buf == NULL because check_length == 0. To avoid scanbuild + * warnings, fail directly instead. + */ + DUK_ASSERT(check_length == 0); + goto fail_neutered; + } + DUK_ASSERT(buf != NULL); + + switch (magic_ftype) { + case DUK__FLD_8BIT: { + if (offset + 1U > check_length) { + goto fail_bounds; + } + /* sign doesn't matter when writing */ + buf[offset] = (duk_uint8_t) duk_to_uint32(thr, 0); + break; + } + case DUK__FLD_16BIT: { + duk_uint16_t tmp; + if (offset + 2U > check_length) { + goto fail_bounds; + } + tmp = (duk_uint16_t) duk_to_uint32(thr, 0); + if (endswap) { + tmp = DUK_BSWAP16(tmp); + } + du.us[0] = tmp; + /* sign doesn't matter when writing */ + duk_memcpy((void *) (buf + offset), (const void *) du.uc, 2); + break; + } + case DUK__FLD_32BIT: { + duk_uint32_t tmp; + if (offset + 4U > check_length) { + goto fail_bounds; + } + tmp = (duk_uint32_t) duk_to_uint32(thr, 0); + if (endswap) { + tmp = DUK_BSWAP32(tmp); + } + du.ui[0] = tmp; + /* sign doesn't matter when writing */ + duk_memcpy((void *) (buf + offset), (const void *) du.uc, 4); + break; + } + case DUK__FLD_FLOAT: { + duk_uint32_t tmp; + if (offset + 4U > check_length) { + goto fail_bounds; + } + du.f[0] = (duk_float_t) duk_to_number(thr, 0); + if (endswap) { + tmp = du.ui[0]; + tmp = DUK_BSWAP32(tmp); + du.ui[0] = tmp; + } + /* sign doesn't matter when writing */ + duk_memcpy((void *) (buf + offset), (const void *) du.uc, 4); + break; + } + case DUK__FLD_DOUBLE: { + if (offset + 8U > check_length) { + goto fail_bounds; + } + du.d = (duk_double_t) duk_to_number(thr, 0); + if (endswap) { + DUK_DBLUNION_BSWAP64(&du); + } + /* sign doesn't matter when writing */ + duk_memcpy((void *) (buf + offset), (const void *) du.uc, 8); + break; + } + case DUK__FLD_VARINT: { + /* Node.js Buffer variable width integer field. We don't really + * care about speed here, so aim for shortest algorithm. + */ + duk_int_t field_bytelen; + duk_int_t i, i_step, i_end; +#if defined(DUK_USE_64BIT_OPS) + duk_int64_t tmp; +#else + duk_double_t tmp; +#endif + duk_uint8_t *p; + + field_bytelen = (duk_int_t) nbytes; + if (offset + (duk_uint_t) field_bytelen > check_length) { + goto fail_bounds; + } + + /* Slow writing of value using either 64-bit arithmetic + * or IEEE doubles if 64-bit types not available. There's + * no special sign handling when writing varints. + */ + + if (magic_bigendian) { + /* Write in big endian */ + i = field_bytelen; /* one i_step added at top of loop */ + i_step = -1; + i_end = 0; + } else { + /* Write in little endian */ + i = -1; /* one i_step added at top of loop */ + i_step = 1; + i_end = field_bytelen - 1; + } + + /* XXX: The duk_to_number() cast followed by integer coercion + * is platform specific so NaN, +/- Infinity, and out-of-bounds + * values result in platform specific output now. + * See: test-bi-nodejs-buffer-proto-varint-special.js + */ + +#if defined(DUK_USE_64BIT_OPS) + tmp = (duk_int64_t) duk_to_number(thr, 0); + p = (duk_uint8_t *) (buf + offset); + do { + i += i_step; + DUK_ASSERT(i >= 0 && i < field_bytelen); + p[i] = (duk_uint8_t) (tmp & 0xff); + tmp = tmp >> 8; /* unnecessary shift for last byte */ + } while (i != i_end); +#else + tmp = duk_to_number(thr, 0); + p = (duk_uint8_t *) (buf + offset); + do { + i += i_step; + tmp = DUK_FLOOR(tmp); + DUK_ASSERT(i >= 0 && i < field_bytelen); + p[i] = (duk_uint8_t) (DUK_FMOD(tmp, 256.0)); + tmp = tmp / 256.0; /* unnecessary div for last byte */ + } while (i != i_end); +#endif + break; + } + default: { /* should never happen but default here */ + goto fail_bounds; + } + } + + /* Node.js Buffer: return offset + #bytes written (i.e. next + * write offset). + */ + if (magic_typedarray) { + /* For TypedArrays 'undefined' return value is specified + * by ES2015 (matches V8). + */ + return 0; + } + duk_push_uint(thr, offset + (duk_uint_t) nbytes); + return 1; + + fail_neutered: + fail_field_length: + fail_bounds: + if (no_assert) { + /* Node.js return value for failed writes is offset + #bytes + * that would have been written. + */ + /* XXX: for negative input offsets, 'offset' will be a large + * positive value so the result here is confusing. + */ + if (magic_typedarray) { + return 0; + } + duk_push_uint(thr, offset + (duk_uint_t) nbytes); + return 1; + } + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * Accessors for .buffer, .byteLength, .byteOffset + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_LOCAL duk_hbufobj *duk__autospawn_arraybuffer(duk_hthread *thr, duk_hbuffer *h_buf) { + duk_hbufobj *h_res; + + h_res = duk_push_bufobj_raw(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_BUFOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARRAYBUFFER), + DUK_BIDX_ARRAYBUFFER_PROTOTYPE); + DUK_ASSERT(h_res != NULL); + DUK_UNREF(h_res); + + duk__set_bufobj_buffer(thr, h_res, h_buf); + DUK_ASSERT_HBUFOBJ_VALID(h_res); + DUK_ASSERT(h_res->buf_prop == NULL); + return h_res; +} + +DUK_INTERNAL duk_ret_t duk_bi_typedarray_buffer_getter(duk_hthread *thr) { + duk_hbufobj *h_bufobj; + + h_bufobj = (duk_hbufobj *) duk__getrequire_bufobj_this(thr, DUK__BUFOBJ_FLAG_THROW /*flags*/); + DUK_ASSERT(h_bufobj != NULL); + if (DUK_HEAPHDR_IS_BUFFER((duk_heaphdr *) h_bufobj)) { + DUK_DD(DUK_DDPRINT("autospawn ArrayBuffer for plain buffer")); + (void) duk__autospawn_arraybuffer(thr, (duk_hbuffer *) h_bufobj); + return 1; + } else { + if (h_bufobj->buf_prop == NULL && + DUK_HOBJECT_GET_CLASS_NUMBER((duk_hobject *) h_bufobj) != DUK_HOBJECT_CLASS_ARRAYBUFFER && + h_bufobj->buf != NULL) { + duk_hbufobj *h_arrbuf; + + DUK_DD(DUK_DDPRINT("autospawn ArrayBuffer for typed array or DataView")); + h_arrbuf = duk__autospawn_arraybuffer(thr, h_bufobj->buf); + + if (h_bufobj->buf_prop == NULL) { + /* Must recheck buf_prop, in case ArrayBuffer + * alloc had a side effect which already filled + * it! + */ + + /* Set ArrayBuffer's .byteOffset and .byteLength based + * on the view so that Arraybuffer[view.byteOffset] + * matches view[0]. + */ + h_arrbuf->offset = 0; + DUK_ASSERT(h_bufobj->offset + h_bufobj->length >= h_bufobj->offset); /* Wrap check on creation. */ + h_arrbuf->length = h_bufobj->offset + h_bufobj->length; + DUK_ASSERT(h_arrbuf->buf_prop == NULL); + + DUK_ASSERT(h_bufobj->buf_prop == NULL); + h_bufobj->buf_prop = (duk_hobject *) h_arrbuf; + DUK_HBUFOBJ_INCREF(thr, h_arrbuf); /* Now reachable and accounted for. */ + } + + /* Left on stack; pushed for the second time below (OK). */ + } + if (h_bufobj->buf_prop) { + duk_push_hobject(thr, h_bufobj->buf_prop); + return 1; + } + } + return 0; +} + +DUK_INTERNAL duk_ret_t duk_bi_typedarray_byteoffset_getter(duk_hthread *thr) { + duk_hbufobj *h_bufobj; + + h_bufobj = (duk_hbufobj *) duk__getrequire_bufobj_this(thr, DUK__BUFOBJ_FLAG_THROW /*flags*/); + DUK_ASSERT(h_bufobj != NULL); + if (DUK_HEAPHDR_IS_BUFFER((duk_heaphdr *) h_bufobj)) { + duk_push_uint(thr, 0); + } else { + /* If neutered must return 0; offset is zeroed during + * neutering. + */ + duk_push_uint(thr, h_bufobj->offset); + } + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_typedarray_bytelength_getter(duk_hthread *thr) { + duk_hbufobj *h_bufobj; + + h_bufobj = (duk_hbufobj *) duk__getrequire_bufobj_this(thr, DUK__BUFOBJ_FLAG_THROW /*flags*/); + DUK_ASSERT(h_bufobj != NULL); + if (DUK_HEAPHDR_IS_BUFFER((duk_heaphdr *) h_bufobj)) { + duk_hbuffer *h_buf; + + h_buf = (duk_hbuffer *) h_bufobj; + DUK_ASSERT(DUK_HBUFFER_GET_SIZE(h_buf) <= DUK_UINT_MAX); /* Buffer limits. */ + duk_push_uint(thr, (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_buf)); + } else { + /* If neutered must return 0; length is zeroed during + * neutering. + */ + duk_push_uint(thr, h_bufobj->length); + } + return 1; +} +#else /* DUK_USE_BUFFEROBJECT_SUPPORT */ +/* No .buffer getter without ArrayBuffer support. */ +#if 0 +DUK_INTERNAL duk_ret_t duk_bi_typedarray_buffer_getter(duk_hthread *thr) { + return 0; +} +#endif + +DUK_INTERNAL duk_ret_t duk_bi_typedarray_byteoffset_getter(duk_hthread *thr) { + duk_push_uint(thr, 0); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_typedarray_bytelength_getter(duk_hthread *thr) { + duk_hbuffer *h_buf; + + /* XXX: helper? */ + duk_push_this(thr); + h_buf = duk_require_hbuffer(thr, -1); + duk_push_uint(thr, DUK_HBUFFER_GET_SIZE(h_buf)); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* automatic undefs */ +#undef DUK__BUFOBJ_FLAG_PROMOTE +#undef DUK__BUFOBJ_FLAG_THROW +#undef DUK__FLD_16BIT +#undef DUK__FLD_32BIT +#undef DUK__FLD_8BIT +#undef DUK__FLD_BIGENDIAN +#undef DUK__FLD_DOUBLE +#undef DUK__FLD_FLOAT +#undef DUK__FLD_SIGNED +#undef DUK__FLD_TYPEDARRAY +#undef DUK__FLD_VARINT +#line 1 "duk_bi_date.c" +/* + * Date built-ins + * + * Unlike most built-ins, Date has some platform dependencies for getting + * UTC time, converting between UTC and local time, and parsing and + * formatting time values. These are all abstracted behind DUK_USE_xxx + * config options. There are built-in platform specific providers for + * POSIX and Windows, but external providers can also be used. + * + * See doc/datetime.rst. + * + */ + +/* #include duk_internal.h -> already included */ + +/* XXX: currently defines unnecessary symbols when DUK_USE_DATE_BUILTIN is disabled. */ + +/* + * Forward declarations + */ + +DUK_LOCAL_DECL duk_double_t duk__push_this_get_timeval_tzoffset(duk_hthread *thr, duk_small_uint_t flags, duk_int_t *out_tzoffset); +DUK_LOCAL_DECL duk_double_t duk__push_this_get_timeval(duk_hthread *thr, duk_small_uint_t flags); +DUK_LOCAL_DECL void duk__twodigit_year_fixup(duk_hthread *thr, duk_idx_t idx_val); +DUK_LOCAL_DECL duk_ret_t duk__set_this_timeval_from_dparts(duk_hthread *thr, duk_double_t *dparts, duk_small_uint_t flags); + +/* + * Other file level defines + */ + +/* Debug macro to print all parts and dparts (used manually because of debug level). */ +#define DUK__DPRINT_PARTS_AND_DPARTS(parts,dparts) do { \ + DUK_D(DUK_DPRINT("parts: %ld %ld %ld %ld %ld %ld %ld %ld, dparts: %lf %lf %lf %lf %lf %lf %lf %lf", \ + (long) (parts)[0], (long) (parts)[1], \ + (long) (parts)[2], (long) (parts)[3], \ + (long) (parts)[4], (long) (parts)[5], \ + (long) (parts)[6], (long) (parts)[7], \ + (double) (dparts)[0], (double) (dparts)[1], \ + (double) (dparts)[2], (double) (dparts)[3], \ + (double) (dparts)[4], (double) (dparts)[5], \ + (double) (dparts)[6], (double) (dparts)[7])); \ + } while (0) +#define DUK__DPRINT_PARTS(parts) do { \ + DUK_D(DUK_DPRINT("parts: %ld %ld %ld %ld %ld %ld %ld %ld", \ + (long) (parts)[0], (long) (parts)[1], \ + (long) (parts)[2], (long) (parts)[3], \ + (long) (parts)[4], (long) (parts)[5], \ + (long) (parts)[6], (long) (parts)[7])); \ + } while (0) +#define DUK__DPRINT_DPARTS(dparts) do { \ + DUK_D(DUK_DPRINT("dparts: %lf %lf %lf %lf %lf %lf %lf %lf", \ + (double) (dparts)[0], (double) (dparts)[1], \ + (double) (dparts)[2], (double) (dparts)[3], \ + (double) (dparts)[4], (double) (dparts)[5], \ + (double) (dparts)[6], (double) (dparts)[7])); \ + } while (0) + +/* Equivalent year for DST calculations outside [1970,2038[ range, see + * E5 Section 15.9.1.8. Equivalent year has the same leap-year-ness and + * starts with the same weekday on Jan 1. + * https://bugzilla.mozilla.org/show_bug.cgi?id=351066 + */ +#define DUK__YEAR(x) ((duk_uint8_t) ((x) - 1970)) +DUK_LOCAL duk_uint8_t duk__date_equivyear[14] = { +#if 1 + /* This is based on V8 EquivalentYear() algorithm (see util/genequivyear.py): + * http://code.google.com/p/v8/source/browse/trunk/src/date.h#146 + */ + + /* non-leap year: sunday, monday, ... */ + DUK__YEAR(2023), DUK__YEAR(2035), DUK__YEAR(2019), DUK__YEAR(2031), + DUK__YEAR(2015), DUK__YEAR(2027), DUK__YEAR(2011), + + /* leap year: sunday, monday, ... */ + DUK__YEAR(2012), DUK__YEAR(2024), DUK__YEAR(2008), DUK__YEAR(2020), + DUK__YEAR(2032), DUK__YEAR(2016), DUK__YEAR(2028) +#endif + +#if 0 + /* This is based on Rhino EquivalentYear() algorithm: + * https://github.com/mozilla/rhino/blob/f99cc11d616f0cdda2c42bde72b3484df6182947/src/org/mozilla/javascript/NativeDate.java + */ + + /* non-leap year: sunday, monday, ... */ + DUK__YEAR(1978), DUK__YEAR(1973), DUK__YEAR(1985), DUK__YEAR(1986), + DUK__YEAR(1981), DUK__YEAR(1971), DUK__YEAR(1977), + + /* leap year: sunday, monday, ... */ + DUK__YEAR(1984), DUK__YEAR(1996), DUK__YEAR(1980), DUK__YEAR(1992), + DUK__YEAR(1976), DUK__YEAR(1988), DUK__YEAR(1972) +#endif +}; + +/* + * ISO 8601 subset parser. + */ + +/* Parser part count. */ +#define DUK__NUM_ISO8601_PARSER_PARTS 9 + +/* Parser part indices. */ +#define DUK__PI_YEAR 0 +#define DUK__PI_MONTH 1 +#define DUK__PI_DAY 2 +#define DUK__PI_HOUR 3 +#define DUK__PI_MINUTE 4 +#define DUK__PI_SECOND 5 +#define DUK__PI_MILLISECOND 6 +#define DUK__PI_TZHOUR 7 +#define DUK__PI_TZMINUTE 8 + +/* Parser part masks. */ +#define DUK__PM_YEAR (1 << DUK__PI_YEAR) +#define DUK__PM_MONTH (1 << DUK__PI_MONTH) +#define DUK__PM_DAY (1 << DUK__PI_DAY) +#define DUK__PM_HOUR (1 << DUK__PI_HOUR) +#define DUK__PM_MINUTE (1 << DUK__PI_MINUTE) +#define DUK__PM_SECOND (1 << DUK__PI_SECOND) +#define DUK__PM_MILLISECOND (1 << DUK__PI_MILLISECOND) +#define DUK__PM_TZHOUR (1 << DUK__PI_TZHOUR) +#define DUK__PM_TZMINUTE (1 << DUK__PI_TZMINUTE) + +/* Parser separator indices. */ +#define DUK__SI_PLUS 0 +#define DUK__SI_MINUS 1 +#define DUK__SI_T 2 +#define DUK__SI_SPACE 3 +#define DUK__SI_COLON 4 +#define DUK__SI_PERIOD 5 +#define DUK__SI_Z 6 +#define DUK__SI_NUL 7 + +/* Parser separator masks. */ +#define DUK__SM_PLUS (1 << DUK__SI_PLUS) +#define DUK__SM_MINUS (1 << DUK__SI_MINUS) +#define DUK__SM_T (1 << DUK__SI_T) +#define DUK__SM_SPACE (1 << DUK__SI_SPACE) +#define DUK__SM_COLON (1 << DUK__SI_COLON) +#define DUK__SM_PERIOD (1 << DUK__SI_PERIOD) +#define DUK__SM_Z (1 << DUK__SI_Z) +#define DUK__SM_NUL (1 << DUK__SI_NUL) + +/* Rule control flags. */ +#define DUK__CF_NEG (1 << 0) /* continue matching, set neg_tzoffset flag */ +#define DUK__CF_ACCEPT (1 << 1) /* accept string */ +#define DUK__CF_ACCEPT_NUL (1 << 2) /* accept string if next char is NUL (otherwise reject) */ + +#define DUK__PACK_RULE(partmask,sepmask,nextpart,flags) \ + ((duk_uint32_t) (partmask) + \ + (((duk_uint32_t) (sepmask)) << 9) + \ + (((duk_uint32_t) (nextpart)) << 17) + \ + (((duk_uint32_t) (flags)) << 21)) + +#define DUK__UNPACK_RULE(rule,var_nextidx,var_flags) do { \ + (var_nextidx) = (duk_small_uint_t) (((rule) >> 17) & 0x0f); \ + (var_flags) = (duk_small_uint_t) ((rule) >> 21); \ + } while (0) + +#define DUK__RULE_MASK_PART_SEP 0x1ffffUL + +/* Matching separator index is used in the control table */ +DUK_LOCAL const duk_uint8_t duk__parse_iso8601_seps[] = { + DUK_ASC_PLUS /*0*/, DUK_ASC_MINUS /*1*/, DUK_ASC_UC_T /*2*/, DUK_ASC_SPACE /*3*/, + DUK_ASC_COLON /*4*/, DUK_ASC_PERIOD /*5*/, DUK_ASC_UC_Z /*6*/, DUK_ASC_NUL /*7*/ +}; + +/* Rule table: first matching rule is used to determine what to do next. */ +DUK_LOCAL const duk_uint32_t duk__parse_iso8601_control[] = { + DUK__PACK_RULE(DUK__PM_YEAR, DUK__SM_MINUS, DUK__PI_MONTH, 0), + DUK__PACK_RULE(DUK__PM_MONTH, DUK__SM_MINUS, DUK__PI_DAY, 0), + DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY, DUK__SM_T | DUK__SM_SPACE, DUK__PI_HOUR, 0), + DUK__PACK_RULE(DUK__PM_HOUR, DUK__SM_COLON, DUK__PI_MINUTE, 0), + DUK__PACK_RULE(DUK__PM_MINUTE, DUK__SM_COLON, DUK__PI_SECOND, 0), + DUK__PACK_RULE(DUK__PM_SECOND, DUK__SM_PERIOD, DUK__PI_MILLISECOND, 0), + DUK__PACK_RULE(DUK__PM_TZHOUR, DUK__SM_COLON, DUK__PI_TZMINUTE, 0), + DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND, DUK__SM_PLUS, DUK__PI_TZHOUR, 0), + DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND, DUK__SM_MINUS, DUK__PI_TZHOUR, DUK__CF_NEG), + DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND, DUK__SM_Z, 0, DUK__CF_ACCEPT_NUL), + DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND | DUK__PM_TZHOUR /*Note2*/ | DUK__PM_TZMINUTE, DUK__SM_NUL, 0, DUK__CF_ACCEPT) + + /* Note1: the specification doesn't require matching a time form with + * just hours ("HH"), but we accept it here, e.g. "2012-01-02T12Z". + * + * Note2: the specification doesn't require matching a timezone offset + * with just hours ("HH"), but accept it here, e.g. "2012-01-02T03:04:05+02" + */ +}; + +DUK_LOCAL duk_bool_t duk__parse_string_iso8601_subset(duk_hthread *thr, const char *str) { + duk_int_t parts[DUK__NUM_ISO8601_PARSER_PARTS]; + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + duk_double_t d; + const duk_uint8_t *p; + duk_small_uint_t part_idx = 0; + duk_int_t accum = 0; + duk_small_uint_t ndigits = 0; + duk_bool_t neg_year = 0; + duk_bool_t neg_tzoffset = 0; + duk_uint_fast8_t ch; + duk_small_uint_t i; + + /* During parsing, month and day are one-based; set defaults here. */ + duk_memzero(parts, sizeof(parts)); + DUK_ASSERT(parts[DUK_DATE_IDX_YEAR] == 0); /* don't care value, year is mandatory */ + parts[DUK_DATE_IDX_MONTH] = 1; + parts[DUK_DATE_IDX_DAY] = 1; + + /* Special handling for year sign. */ + p = (const duk_uint8_t *) str; + ch = p[0]; + if (ch == DUK_ASC_PLUS) { + p++; + } else if (ch == DUK_ASC_MINUS) { + neg_year = 1; + p++; + } + + for (;;) { + ch = *p++; + DUK_DDD(DUK_DDDPRINT("parsing, part_idx=%ld, char=%ld ('%c')", + (long) part_idx, (long) ch, + (int) ((ch >= 0x20 && ch <= 0x7e) ? ch : DUK_ASC_QUESTION))); + + if (ch >= DUK_ASC_0 && ch <= DUK_ASC_9) { + if (ndigits >= 9) { + DUK_DDD(DUK_DDDPRINT("too many digits -> reject")); + goto reject; + } + if (part_idx == DUK__PI_MILLISECOND && ndigits >= 3) { + /* ignore millisecond fractions after 3 */ + } else { + accum = accum * 10 + ((duk_int_t) ch) - ((duk_int_t) DUK_ASC_0) + 0x00; + ndigits++; + } + } else { + duk_uint_fast32_t match_val; + duk_small_uint_t sep_idx; + + if (ndigits <= 0) { + goto reject; + } + if (part_idx == DUK__PI_MILLISECOND) { + /* complete the millisecond field */ + while (ndigits < 3) { + accum *= 10; + ndigits++; + } + } + parts[part_idx] = accum; + DUK_DDD(DUK_DDDPRINT("wrote part %ld -> value %ld", (long) part_idx, (long) accum)); + + accum = 0; + ndigits = 0; + + for (i = 0; i < (duk_small_uint_t) (sizeof(duk__parse_iso8601_seps) / sizeof(duk_uint8_t)); i++) { + if (duk__parse_iso8601_seps[i] == ch) { + break; + } + } + if (i == (duk_small_uint_t) (sizeof(duk__parse_iso8601_seps) / sizeof(duk_uint8_t))) { + DUK_DDD(DUK_DDDPRINT("separator character doesn't match -> reject")); + goto reject; + } + + sep_idx = i; + match_val = (1UL << part_idx) + (1UL << (sep_idx + 9)); /* match against rule part/sep bits */ + + for (i = 0; i < (duk_small_uint_t) (sizeof(duk__parse_iso8601_control) / sizeof(duk_uint32_t)); i++) { + duk_uint_fast32_t rule = duk__parse_iso8601_control[i]; + duk_small_uint_t nextpart; + duk_small_uint_t cflags; + + DUK_DDD(DUK_DDDPRINT("part_idx=%ld, sep_idx=%ld, match_val=0x%08lx, considering rule=0x%08lx", + (long) part_idx, (long) sep_idx, + (unsigned long) match_val, (unsigned long) rule)); + + if ((rule & match_val) != match_val) { + continue; + } + + DUK__UNPACK_RULE(rule, nextpart, cflags); + + DUK_DDD(DUK_DDDPRINT("rule match -> part_idx=%ld, sep_idx=%ld, match_val=0x%08lx, " + "rule=0x%08lx -> nextpart=%ld, cflags=0x%02lx", + (long) part_idx, (long) sep_idx, + (unsigned long) match_val, (unsigned long) rule, + (long) nextpart, (unsigned long) cflags)); + + if (cflags & DUK__CF_NEG) { + neg_tzoffset = 1; + } + + if (cflags & DUK__CF_ACCEPT) { + goto accept; + } + + if (cflags & DUK__CF_ACCEPT_NUL) { + DUK_ASSERT(*(p - 1) != (char) 0); + if (*p == DUK_ASC_NUL) { + goto accept; + } + goto reject; + } + + part_idx = nextpart; + break; + } /* rule match */ + + if (i == (duk_small_uint_t) (sizeof(duk__parse_iso8601_control) / sizeof(duk_uint32_t))) { + DUK_DDD(DUK_DDDPRINT("no rule matches -> reject")); + goto reject; + } + + if (ch == 0) { + /* This shouldn't be necessary, but check just in case + * to avoid any chance of overruns. + */ + DUK_DDD(DUK_DDDPRINT("NUL after rule matching (should not happen) -> reject")); + goto reject; + } + } /* if-digit-else-ctrl */ + } /* char loop */ + + /* We should never exit the loop above. */ + DUK_UNREACHABLE(); + + reject: + DUK_DDD(DUK_DDDPRINT("reject")); + return 0; + + accept: + DUK_DDD(DUK_DDDPRINT("accept")); + + /* Apply timezone offset to get the main parts in UTC */ + if (neg_year) { + parts[DUK__PI_YEAR] = -parts[DUK__PI_YEAR]; + } + if (neg_tzoffset) { + parts[DUK__PI_HOUR] += parts[DUK__PI_TZHOUR]; + parts[DUK__PI_MINUTE] += parts[DUK__PI_TZMINUTE]; + } else { + parts[DUK__PI_HOUR] -= parts[DUK__PI_TZHOUR]; + parts[DUK__PI_MINUTE] -= parts[DUK__PI_TZMINUTE]; + } + parts[DUK__PI_MONTH] -= 1; /* zero-based month */ + parts[DUK__PI_DAY] -= 1; /* zero-based day */ + + /* Use double parts, they tolerate unnormalized time. + * + * Note: DUK_DATE_IDX_WEEKDAY is initialized with a bogus value (DUK__PI_TZHOUR) + * on purpose. It won't be actually used by duk_bi_date_get_timeval_from_dparts(), + * but will make the value initialized just in case, and avoid any + * potential for Valgrind issues. + */ + for (i = 0; i < DUK_DATE_IDX_NUM_PARTS; i++) { + DUK_DDD(DUK_DDDPRINT("part[%ld] = %ld", (long) i, (long) parts[i])); + dparts[i] = parts[i]; + } + + d = duk_bi_date_get_timeval_from_dparts(dparts, 0 /*flags*/); + duk_push_number(thr, d); + return 1; +} + +/* + * Date/time parsing helper. + * + * Parse a datetime string into a time value. We must first try to parse + * the input according to the standard format in E5.1 Section 15.9.1.15. + * If that fails, we can try to parse using custom parsing, which can + * either be platform neutral (custom code) or platform specific (using + * existing platform API calls). + * + * Note in particular that we must parse whatever toString(), toUTCString(), + * and toISOString() can produce; see E5.1 Section 15.9.4.2. + * + * Returns 1 to allow tail calling. + * + * There is much room for improvement here with respect to supporting + * alternative datetime formats. For instance, V8 parses '2012-01-01' as + * UTC and '2012/01/01' as local time. + */ + +DUK_LOCAL duk_ret_t duk__parse_string(duk_hthread *thr, const char *str) { + /* XXX: there is a small risk here: because the ISO 8601 parser is + * very loose, it may end up parsing some datetime values which + * would be better parsed with a platform specific parser. + */ + + DUK_ASSERT(str != NULL); + DUK_DDD(DUK_DDDPRINT("parse datetime from string '%s'", (const char *) str)); + + if (duk__parse_string_iso8601_subset(thr, str) != 0) { + return 1; + } + +#if defined(DUK_USE_DATE_PARSE_STRING) + /* Contract, either: + * - Push value on stack and return 1 + * - Don't push anything on stack and return 0 + */ + + if (DUK_USE_DATE_PARSE_STRING(thr, str) != 0) { + return 1; + } +#else + /* No platform-specific parsing, this is not an error. */ +#endif + + duk_push_nan(thr); + return 1; +} + +/* + * Calendar helpers + * + * Some helpers are used for getters and can operate on normalized values + * which can be represented with 32-bit signed integers. Other helpers are + * needed by setters and operate on un-normalized double values, must watch + * out for non-finite numbers etc. + */ + +DUK_LOCAL duk_uint8_t duk__days_in_month[12] = { + (duk_uint8_t) 31, (duk_uint8_t) 28, (duk_uint8_t) 31, (duk_uint8_t) 30, + (duk_uint8_t) 31, (duk_uint8_t) 30, (duk_uint8_t) 31, (duk_uint8_t) 31, + (duk_uint8_t) 30, (duk_uint8_t) 31, (duk_uint8_t) 30, (duk_uint8_t) 31 +}; + +/* Maximum iteration count for computing UTC-to-local time offset when + * creating an ECMAScript time value from local parts. + */ +#define DUK__LOCAL_TZOFFSET_MAXITER 4 + +/* Because 'day since epoch' can be negative and is used to compute weekday + * using a modulo operation, add this multiple of 7 to avoid negative values + * when year is below 1970 epoch. ECMAScript time values are restricted to + * +/- 100 million days from epoch, so this adder fits nicely into 32 bits. + * Round to a multiple of 7 (= floor(100000000 / 7) * 7) and add margin. + */ +#define DUK__WEEKDAY_MOD_ADDER (20000000 * 7) /* 0x08583b00 */ + +DUK_INTERNAL duk_bool_t duk_bi_date_is_leap_year(duk_int_t year) { + if ((year % 4) != 0) { + return 0; + } + if ((year % 100) != 0) { + return 1; + } + if ((year % 400) != 0) { + return 0; + } + return 1; +} + +DUK_INTERNAL duk_bool_t duk_bi_date_timeval_in_valid_range(duk_double_t x) { + return (x >= -DUK_DATE_MSEC_100M_DAYS && x <= DUK_DATE_MSEC_100M_DAYS); +} + +DUK_INTERNAL duk_bool_t duk_bi_date_timeval_in_leeway_range(duk_double_t x) { + return (x >= -DUK_DATE_MSEC_100M_DAYS_LEEWAY && x <= DUK_DATE_MSEC_100M_DAYS_LEEWAY); +} + +DUK_INTERNAL duk_bool_t duk_bi_date_year_in_valid_range(duk_double_t x) { + return (x >= DUK_DATE_MIN_ECMA_YEAR && x <= DUK_DATE_MAX_ECMA_YEAR); +} + +DUK_LOCAL duk_double_t duk__timeclip(duk_double_t x) { + if (!DUK_ISFINITE(x)) { + return DUK_DOUBLE_NAN; + } + + if (!duk_bi_date_timeval_in_valid_range(x)) { + return DUK_DOUBLE_NAN; + } + + x = duk_js_tointeger_number(x); + + /* Here we'd have the option to normalize -0 to +0. */ + return x; +} + +/* Integer division which floors also negative values correctly. */ +DUK_LOCAL duk_int_t duk__div_floor(duk_int_t a, duk_int_t b) { + DUK_ASSERT(b > 0); + if (a >= 0) { + return a / b; + } else { + /* e.g. a = -4, b = 5 --> -4 - 5 + 1 / 5 --> -8 / 5 --> -1 + * a = -5, b = 5 --> -5 - 5 + 1 / 5 --> -9 / 5 --> -1 + * a = -6, b = 5 --> -6 - 5 + 1 / 5 --> -10 / 5 --> -2 + */ + return (a - b + 1) / b; + } +} + +/* Compute day number of the first day of a given year. */ +DUK_LOCAL duk_int_t duk__day_from_year(duk_int_t year) { + /* Note: in integer arithmetic, (x / 4) is same as floor(x / 4) for non-negative + * values, but is incorrect for negative ones. + */ + return 365 * (year - 1970) + + duk__div_floor(year - 1969, 4) + - duk__div_floor(year - 1901, 100) + + duk__div_floor(year - 1601, 400); +} + +/* Given a day number, determine year and day-within-year. */ +DUK_LOCAL duk_int_t duk__year_from_day(duk_int_t day, duk_small_int_t *out_day_within_year) { + duk_int_t year; + duk_int_t diff_days; + + /* estimate year upwards (towards positive infinity), then back down; + * two iterations should be enough + */ + + if (day >= 0) { + year = 1970 + day / 365; + } else { + year = 1970 + day / 366; + } + + for (;;) { + diff_days = duk__day_from_year(year) - day; + DUK_DDD(DUK_DDDPRINT("year=%ld day=%ld, diff_days=%ld", (long) year, (long) day, (long) diff_days)); + if (diff_days <= 0) { + DUK_ASSERT(-diff_days < 366); /* fits into duk_small_int_t */ + *out_day_within_year = -diff_days; + DUK_DDD(DUK_DDDPRINT("--> year=%ld, day-within-year=%ld", + (long) year, (long) *out_day_within_year)); + DUK_ASSERT(*out_day_within_year >= 0); + DUK_ASSERT(*out_day_within_year < (duk_bi_date_is_leap_year(year) ? 366 : 365)); + return year; + } + + /* Note: this is very tricky; we must never 'overshoot' the + * correction downwards. + */ + year -= 1 + (diff_days - 1) / 366; /* conservative */ + } +} + +/* Given a (year, month, day-within-month) triple, compute day number. + * The input triple is un-normalized and may contain non-finite values. + */ +DUK_LOCAL duk_double_t duk__make_day(duk_double_t year, duk_double_t month, duk_double_t day) { + duk_int_t day_num; + duk_bool_t is_leap; + duk_small_int_t i, n; + + /* Assume that year, month, day are all coerced to whole numbers. + * They may also be NaN or infinity, in which case this function + * must return NaN or infinity to ensure time value becomes NaN. + * If 'day' is NaN, the final return will end up returning a NaN, + * so it doesn't need to be checked here. + */ + + if (!DUK_ISFINITE(year) || !DUK_ISFINITE(month)) { + return DUK_DOUBLE_NAN; + } + + year += DUK_FLOOR(month / 12.0); + + month = DUK_FMOD(month, 12.0); + if (month < 0.0) { + /* handle negative values */ + month += 12.0; + } + + /* The algorithm in E5.1 Section 15.9.1.12 normalizes month, but + * does not normalize the day-of-month (nor check whether or not + * it is finite) because it's not necessary for finding the day + * number which matches the (year,month) pair. + * + * We assume that duk__day_from_year() is exact here. + * + * Without an explicit infinity / NaN check in the beginning, + * day_num would be a bogus integer here. + * + * It's possible for 'year' to be out of integer range here. + * If so, we need to return NaN without integer overflow. + * This fixes test-bug-setyear-overflow.js. + */ + + if (!duk_bi_date_year_in_valid_range(year)) { + DUK_DD(DUK_DDPRINT("year not in ecmascript valid range, avoid integer overflow: %lf", (double) year)); + return DUK_DOUBLE_NAN; + } + day_num = duk__day_from_year((duk_int_t) year); + is_leap = duk_bi_date_is_leap_year((duk_int_t) year); + + n = (duk_small_int_t) month; + for (i = 0; i < n; i++) { + day_num += duk__days_in_month[i]; + if (i == 1 && is_leap) { + day_num++; + } + } + + /* If 'day' is NaN, returns NaN. */ + return (duk_double_t) day_num + day; +} + +/* Split time value into parts. The time value may contain fractions (it may + * come from duk_time_to_components() API call) which are truncated. Possible + * local time adjustment has already been applied when reading the time value. + */ +DUK_INTERNAL void duk_bi_date_timeval_to_parts(duk_double_t d, duk_int_t *parts, duk_double_t *dparts, duk_small_uint_t flags) { + duk_double_t d1, d2; + duk_int_t t1, t2; + duk_int_t day_since_epoch; + duk_int_t year; /* does not fit into 16 bits */ + duk_small_int_t day_in_year; + duk_small_int_t month; + duk_small_int_t day; + duk_small_int_t dim; + duk_int_t jan1_since_epoch; + duk_small_int_t jan1_weekday; + duk_int_t equiv_year; + duk_small_uint_t i; + duk_bool_t is_leap; + duk_small_int_t arridx; + + DUK_ASSERT(DUK_ISFINITE(d)); /* caller checks */ + d = DUK_FLOOR(d); /* remove fractions if present */ + DUK_ASSERT(DUK_FLOOR(d) == d); + + /* The timevalue must be in valid ECMAScript range, but since a local + * time offset can be applied, we need to allow a +/- 24h leeway to + * the value. In other words, although the UTC time is within the + * ECMAScript range, the local part values can be just outside of it. + */ + DUK_UNREF(duk_bi_date_timeval_in_leeway_range); + DUK_ASSERT(duk_bi_date_timeval_in_leeway_range(d)); + + /* These computations are guaranteed to be exact for the valid + * E5 time value range, assuming milliseconds without fractions. + */ + d1 = (duk_double_t) DUK_FMOD(d, (double) DUK_DATE_MSEC_DAY); + if (d1 < 0.0) { + /* deal with negative values */ + d1 += (duk_double_t) DUK_DATE_MSEC_DAY; + } + d2 = DUK_FLOOR((double) (d / (duk_double_t) DUK_DATE_MSEC_DAY)); + DUK_ASSERT(d2 * ((duk_double_t) DUK_DATE_MSEC_DAY) + d1 == d); + /* now expected to fit into a 32-bit integer */ + t1 = (duk_int_t) d1; + t2 = (duk_int_t) d2; + day_since_epoch = t2; + DUK_ASSERT((duk_double_t) t1 == d1); + DUK_ASSERT((duk_double_t) t2 == d2); + + /* t1 = milliseconds within day (fits 32 bit) + * t2 = day number from epoch (fits 32 bit, may be negative) + */ + + parts[DUK_DATE_IDX_MILLISECOND] = t1 % 1000; t1 /= 1000; + parts[DUK_DATE_IDX_SECOND] = t1 % 60; t1 /= 60; + parts[DUK_DATE_IDX_MINUTE] = t1 % 60; t1 /= 60; + parts[DUK_DATE_IDX_HOUR] = t1; + DUK_ASSERT(parts[DUK_DATE_IDX_MILLISECOND] >= 0 && parts[DUK_DATE_IDX_MILLISECOND] <= 999); + DUK_ASSERT(parts[DUK_DATE_IDX_SECOND] >= 0 && parts[DUK_DATE_IDX_SECOND] <= 59); + DUK_ASSERT(parts[DUK_DATE_IDX_MINUTE] >= 0 && parts[DUK_DATE_IDX_MINUTE] <= 59); + DUK_ASSERT(parts[DUK_DATE_IDX_HOUR] >= 0 && parts[DUK_DATE_IDX_HOUR] <= 23); + + DUK_DDD(DUK_DDDPRINT("d=%lf, d1=%lf, d2=%lf, t1=%ld, t2=%ld, parts: hour=%ld min=%ld sec=%ld msec=%ld", + (double) d, (double) d1, (double) d2, (long) t1, (long) t2, + (long) parts[DUK_DATE_IDX_HOUR], + (long) parts[DUK_DATE_IDX_MINUTE], + (long) parts[DUK_DATE_IDX_SECOND], + (long) parts[DUK_DATE_IDX_MILLISECOND])); + + /* This assert depends on the input parts representing time inside + * the ECMAScript range. + */ + DUK_ASSERT(t2 + DUK__WEEKDAY_MOD_ADDER >= 0); + parts[DUK_DATE_IDX_WEEKDAY] = (t2 + 4 + DUK__WEEKDAY_MOD_ADDER) % 7; /* E5.1 Section 15.9.1.6 */ + DUK_ASSERT(parts[DUK_DATE_IDX_WEEKDAY] >= 0 && parts[DUK_DATE_IDX_WEEKDAY] <= 6); + + year = duk__year_from_day(t2, &day_in_year); + day = day_in_year; + is_leap = duk_bi_date_is_leap_year(year); + for (month = 0; month < 12; month++) { + dim = duk__days_in_month[month]; + if (month == 1 && is_leap) { + dim++; + } + DUK_DDD(DUK_DDDPRINT("month=%ld, dim=%ld, day=%ld", + (long) month, (long) dim, (long) day)); + if (day < dim) { + break; + } + day -= dim; + } + DUK_DDD(DUK_DDDPRINT("final month=%ld", (long) month)); + DUK_ASSERT(month >= 0 && month <= 11); + DUK_ASSERT(day >= 0 && day <= 31); + + /* Equivalent year mapping, used to avoid DST trouble when platform + * may fail to provide reasonable DST answers for dates outside the + * ordinary range (e.g. 1970-2038). An equivalent year has the same + * leap-year-ness as the original year and begins on the same weekday + * (Jan 1). + * + * The year 2038 is avoided because there seem to be problems with it + * on some platforms. The year 1970 is also avoided as there were + * practical problems with it; an equivalent year is used for it too, + * which breaks some DST computations for 1970 right now, see e.g. + * test-bi-date-tzoffset-brute-fi.js. + */ + if ((flags & DUK_DATE_FLAG_EQUIVYEAR) && (year < 1971 || year > 2037)) { + DUK_ASSERT(is_leap == 0 || is_leap == 1); + + jan1_since_epoch = day_since_epoch - day_in_year; /* day number for Jan 1 since epoch */ + DUK_ASSERT(jan1_since_epoch + DUK__WEEKDAY_MOD_ADDER >= 0); + jan1_weekday = (jan1_since_epoch + 4 + DUK__WEEKDAY_MOD_ADDER) % 7; /* E5.1 Section 15.9.1.6 */ + DUK_ASSERT(jan1_weekday >= 0 && jan1_weekday <= 6); + arridx = jan1_weekday; + if (is_leap) { + arridx += 7; + } + DUK_ASSERT(arridx >= 0 && arridx < (duk_small_int_t) (sizeof(duk__date_equivyear) / sizeof(duk_uint8_t))); + + equiv_year = (duk_int_t) duk__date_equivyear[arridx] + 1970; + year = equiv_year; + DUK_DDD(DUK_DDDPRINT("equiv year mapping, year=%ld, day_in_year=%ld, day_since_epoch=%ld, " + "jan1_since_epoch=%ld, jan1_weekday=%ld -> equiv year %ld", + (long) year, (long) day_in_year, (long) day_since_epoch, + (long) jan1_since_epoch, (long) jan1_weekday, (long) equiv_year)); + } + + parts[DUK_DATE_IDX_YEAR] = year; + parts[DUK_DATE_IDX_MONTH] = month; + parts[DUK_DATE_IDX_DAY] = day; + + if (flags & DUK_DATE_FLAG_ONEBASED) { + parts[DUK_DATE_IDX_MONTH]++; /* zero-based -> one-based */ + parts[DUK_DATE_IDX_DAY]++; /* -""- */ + } + + if (dparts != NULL) { + for (i = 0; i < DUK_DATE_IDX_NUM_PARTS; i++) { + dparts[i] = (duk_double_t) parts[i]; + } + } +} + +/* Compute time value from (double) parts. The parts can be either UTC + * or local time; if local, they need to be (conceptually) converted into + * UTC time. The parts may represent valid or invalid time, and may be + * wildly out of range (but may cancel each other and still come out in + * the valid Date range). + */ +DUK_INTERNAL duk_double_t duk_bi_date_get_timeval_from_dparts(duk_double_t *dparts, duk_small_uint_t flags) { +#if defined(DUK_USE_PARANOID_DATE_COMPUTATION) + /* See comments below on MakeTime why these are volatile. */ + volatile duk_double_t tmp_time; + volatile duk_double_t tmp_day; + volatile duk_double_t d; +#else + duk_double_t tmp_time; + duk_double_t tmp_day; + duk_double_t d; +#endif + duk_small_uint_t i; + duk_int_t tzoff, tzoffprev1, tzoffprev2; + + /* Expects 'this' at top of stack on entry. */ + + /* Coerce all finite parts with ToInteger(). ToInteger() must not + * be called for NaN/Infinity because it will convert e.g. NaN to + * zero. If ToInteger() has already been called, this has no side + * effects and is idempotent. + * + * Don't read dparts[DUK_DATE_IDX_WEEKDAY]; it will cause Valgrind + * issues if the value is uninitialized. + */ + for (i = 0; i <= DUK_DATE_IDX_MILLISECOND; i++) { + /* SCANBUILD: scan-build complains here about assigned value + * being garbage or undefined. This is correct but operating + * on undefined values has no ill effect and is ignored by the + * caller in the case where this happens. + */ + d = dparts[i]; + if (DUK_ISFINITE(d)) { + dparts[i] = duk_js_tointeger_number(d); + } + } + + /* Use explicit steps in computation to try to ensure that + * computation happens with intermediate results coerced to + * double values (instead of using something more accurate). + * E.g. E5.1 Section 15.9.1.11 requires use of IEEE 754 + * rules (= ECMAScript '+' and '*' operators). + * + * Without 'volatile' even this approach fails on some platform + * and compiler combinations. For instance, gcc 4.8.1 on Ubuntu + * 64-bit, with -m32 and without -std=c99, test-bi-date-canceling.js + * would fail because of some optimizations when computing tmp_time + * (MakeTime below). Adding 'volatile' to tmp_time solved this + * particular problem (annoyingly, also adding debug prints or + * running the executable under valgrind hides it). + */ + + /* MakeTime */ + tmp_time = 0.0; + tmp_time += dparts[DUK_DATE_IDX_HOUR] * ((duk_double_t) DUK_DATE_MSEC_HOUR); + tmp_time += dparts[DUK_DATE_IDX_MINUTE] * ((duk_double_t) DUK_DATE_MSEC_MINUTE); + tmp_time += dparts[DUK_DATE_IDX_SECOND] * ((duk_double_t) DUK_DATE_MSEC_SECOND); + tmp_time += dparts[DUK_DATE_IDX_MILLISECOND]; + + /* MakeDay */ + tmp_day = duk__make_day(dparts[DUK_DATE_IDX_YEAR], dparts[DUK_DATE_IDX_MONTH], dparts[DUK_DATE_IDX_DAY]); + + /* MakeDate */ + d = tmp_day * ((duk_double_t) DUK_DATE_MSEC_DAY) + tmp_time; + + DUK_DDD(DUK_DDDPRINT("time=%lf day=%lf --> timeval=%lf", + (double) tmp_time, (double) tmp_day, (double) d)); + + /* Optional UTC conversion. */ + if (flags & DUK_DATE_FLAG_LOCALTIME) { + /* DUK_USE_DATE_GET_LOCAL_TZOFFSET() needs to be called with a + * time value computed from UTC parts. At this point we only + * have 'd' which is a time value computed from local parts, so + * it is off by the UTC-to-local time offset which we don't know + * yet. The current solution for computing the UTC-to-local + * time offset is to iterate a few times and detect a fixed + * point or a two-cycle loop (or a sanity iteration limit), + * see test-bi-date-local-parts.js and test-bi-date-tzoffset-basic-fi.js. + * + * E5.1 Section 15.9.1.9: + * UTC(t) = t - LocalTZA - DaylightSavingTA(t - LocalTZA) + * + * For NaN/inf, DUK_USE_DATE_GET_LOCAL_TZOFFSET() returns 0. + */ + +#if 0 + /* Old solution: don't iterate, incorrect */ + tzoff = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d); + DUK_DDD(DUK_DDDPRINT("tzoffset w/o iteration, tzoff=%ld", (long) tzoff)); + d -= tzoff * 1000L; + DUK_UNREF(tzoffprev1); + DUK_UNREF(tzoffprev2); +#endif + + /* Iteration solution */ + tzoff = 0; + tzoffprev1 = 999999999L; /* invalid value which never matches */ + for (i = 0; i < DUK__LOCAL_TZOFFSET_MAXITER; i++) { + tzoffprev2 = tzoffprev1; + tzoffprev1 = tzoff; + tzoff = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d - tzoff * 1000L); + DUK_DDD(DUK_DDDPRINT("tzoffset iteration, i=%d, tzoff=%ld, tzoffprev1=%ld tzoffprev2=%ld", + (int) i, (long) tzoff, (long) tzoffprev1, (long) tzoffprev2)); + if (tzoff == tzoffprev1) { + DUK_DDD(DUK_DDDPRINT("tzoffset iteration finished, i=%d, tzoff=%ld, tzoffprev1=%ld, tzoffprev2=%ld", + (int) i, (long) tzoff, (long) tzoffprev1, (long) tzoffprev2)); + break; + } else if (tzoff == tzoffprev2) { + /* Two value cycle, see e.g. test-bi-date-tzoffset-basic-fi.js. + * In these cases, favor a higher tzoffset to get a consistent + * result which is independent of iteration count. Not sure if + * this is a generically correct solution. + */ + DUK_DDD(DUK_DDDPRINT("tzoffset iteration two-value cycle, i=%d, tzoff=%ld, tzoffprev1=%ld, tzoffprev2=%ld", + (int) i, (long) tzoff, (long) tzoffprev1, (long) tzoffprev2)); + if (tzoffprev1 > tzoff) { + tzoff = tzoffprev1; + } + break; + } + } + DUK_DDD(DUK_DDDPRINT("tzoffset iteration, tzoff=%ld", (long) tzoff)); + d -= tzoff * 1000L; + } + + /* TimeClip(), which also handles Infinity -> NaN conversion */ + d = duk__timeclip(d); + + return d; +} + +/* + * API oriented helpers + */ + +/* Push 'this' binding, check that it is a Date object; then push the + * internal time value. At the end, stack is: [ ... this timeval ]. + * Returns the time value. Local time adjustment is done if requested. + */ +DUK_LOCAL duk_double_t duk__push_this_get_timeval_tzoffset(duk_hthread *thr, duk_small_uint_t flags, duk_int_t *out_tzoffset) { + duk_hobject *h; + duk_double_t d; + duk_int_t tzoffset = 0; + + duk_push_this(thr); + h = duk_get_hobject(thr, -1); /* XXX: getter with class check, useful in built-ins */ + if (h == NULL || DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_DATE) { + DUK_ERROR_TYPE(thr, "expected Date"); + DUK_WO_NORETURN(return 0.0;); + } + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE); + d = duk_to_number_m1(thr); + duk_pop(thr); + + if (DUK_ISNAN(d)) { + if (flags & DUK_DATE_FLAG_NAN_TO_ZERO) { + d = 0.0; + } + if (flags & DUK_DATE_FLAG_NAN_TO_RANGE_ERROR) { + DUK_ERROR_RANGE(thr, "Invalid Date"); + DUK_WO_NORETURN(return 0.0;); + } + } + /* if no NaN handling flag, may still be NaN here, but not Inf */ + DUK_ASSERT(!DUK_ISINF(d)); + + if (flags & DUK_DATE_FLAG_LOCALTIME) { + /* Note: DST adjustment is determined using UTC time. + * If 'd' is NaN, tzoffset will be 0. + */ + tzoffset = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d); /* seconds */ + d += tzoffset * 1000L; + } + if (out_tzoffset) { + *out_tzoffset = tzoffset; + } + + /* [ ... this ] */ + return d; +} + +DUK_LOCAL duk_double_t duk__push_this_get_timeval(duk_hthread *thr, duk_small_uint_t flags) { + return duk__push_this_get_timeval_tzoffset(thr, flags, NULL); +} + +/* Set timeval to 'this' from dparts, push the new time value onto the + * value stack and return 1 (caller can then tail call us). Expects + * the value stack to contain 'this' on the stack top. + */ +DUK_LOCAL duk_ret_t duk__set_this_timeval_from_dparts(duk_hthread *thr, duk_double_t *dparts, duk_small_uint_t flags) { + duk_double_t d; + + /* [ ... this ] */ + + d = duk_bi_date_get_timeval_from_dparts(dparts, flags); + duk_push_number(thr, d); /* -> [ ... this timeval_new ] */ + duk_dup_top(thr); /* -> [ ... this timeval_new timeval_new ] */ + duk_put_prop_stridx_short(thr, -3, DUK_STRIDX_INT_VALUE); + + /* stack top: new time value, return 1 to allow tail calls */ + return 1; +} + +/* 'out_buf' must be at least DUK_BI_DATE_ISO8601_BUFSIZE long. */ +DUK_LOCAL void duk__format_parts_iso8601(duk_int_t *parts, duk_int_t tzoffset, duk_small_uint_t flags, duk_uint8_t *out_buf) { + char yearstr[8]; /* "-123456\0" */ + char tzstr[8]; /* "+11:22\0" */ + char sep = (flags & DUK_DATE_FLAG_SEP_T) ? DUK_ASC_UC_T : DUK_ASC_SPACE; + + DUK_ASSERT(parts[DUK_DATE_IDX_MONTH] >= 1 && parts[DUK_DATE_IDX_MONTH] <= 12); + DUK_ASSERT(parts[DUK_DATE_IDX_DAY] >= 1 && parts[DUK_DATE_IDX_DAY] <= 31); + DUK_ASSERT(parts[DUK_DATE_IDX_YEAR] >= -999999 && parts[DUK_DATE_IDX_YEAR] <= 999999); + + /* Note: %06d for positive value, %07d for negative value to include + * sign and 6 digits. + */ + DUK_SNPRINTF(yearstr, + sizeof(yearstr), + (parts[DUK_DATE_IDX_YEAR] >= 0 && parts[DUK_DATE_IDX_YEAR] <= 9999) ? "%04ld" : + ((parts[DUK_DATE_IDX_YEAR] >= 0) ? "+%06ld" : "%07ld"), + (long) parts[DUK_DATE_IDX_YEAR]); + yearstr[sizeof(yearstr) - 1] = (char) 0; + + if (flags & DUK_DATE_FLAG_LOCALTIME) { + /* tzoffset seconds are dropped; 16 bits suffice for + * time offset in minutes + */ + const char *fmt; + duk_small_int_t tmp, arg_hours, arg_minutes; + + if (tzoffset >= 0) { + tmp = tzoffset; + fmt = "+%02d:%02d"; + } else { + tmp = -tzoffset; + fmt = "-%02d:%02d"; + } + tmp = tmp / 60; + arg_hours = tmp / 60; + arg_minutes = tmp % 60; + DUK_ASSERT(arg_hours <= 24); /* Even less is actually guaranteed for a valid tzoffset. */ + arg_hours = arg_hours & 0x3f; /* For [0,24] this is a no-op, but fixes GCC 7 warning, see https://github.com/svaarala/duktape/issues/1602. */ + + DUK_SNPRINTF(tzstr, sizeof(tzstr), fmt, (int) arg_hours, (int) arg_minutes); + tzstr[sizeof(tzstr) - 1] = (char) 0; + } else { + tzstr[0] = DUK_ASC_UC_Z; + tzstr[1] = (char) 0; + } + + /* Unlike year, the other parts fit into 16 bits so %d format + * is portable. + */ + if ((flags & DUK_DATE_FLAG_TOSTRING_DATE) && (flags & DUK_DATE_FLAG_TOSTRING_TIME)) { + DUK_SPRINTF((char *) out_buf, "%s-%02d-%02d%c%02d:%02d:%02d.%03d%s", + (const char *) yearstr, (int) parts[DUK_DATE_IDX_MONTH], (int) parts[DUK_DATE_IDX_DAY], (int) sep, + (int) parts[DUK_DATE_IDX_HOUR], (int) parts[DUK_DATE_IDX_MINUTE], + (int) parts[DUK_DATE_IDX_SECOND], (int) parts[DUK_DATE_IDX_MILLISECOND], (const char *) tzstr); + } else if (flags & DUK_DATE_FLAG_TOSTRING_DATE) { + DUK_SPRINTF((char *) out_buf, "%s-%02d-%02d", + (const char *) yearstr, (int) parts[DUK_DATE_IDX_MONTH], (int) parts[DUK_DATE_IDX_DAY]); + } else { + DUK_ASSERT(flags & DUK_DATE_FLAG_TOSTRING_TIME); + DUK_SPRINTF((char *) out_buf, "%02d:%02d:%02d.%03d%s", + (int) parts[DUK_DATE_IDX_HOUR], (int) parts[DUK_DATE_IDX_MINUTE], + (int) parts[DUK_DATE_IDX_SECOND], (int) parts[DUK_DATE_IDX_MILLISECOND], + (const char *) tzstr); + } +} + +/* Helper for string conversion calls: check 'this' binding, get the + * internal time value, and format date and/or time in a few formats. + * Return value allows tail calls. + */ +DUK_LOCAL duk_ret_t duk__to_string_helper(duk_hthread *thr, duk_small_uint_t flags) { + duk_double_t d; + duk_int_t parts[DUK_DATE_IDX_NUM_PARTS]; + duk_int_t tzoffset; /* seconds, doesn't fit into 16 bits */ + duk_bool_t rc; + duk_uint8_t buf[DUK_BI_DATE_ISO8601_BUFSIZE]; + + DUK_UNREF(rc); /* unreferenced with some options */ + + d = duk__push_this_get_timeval_tzoffset(thr, flags, &tzoffset); + if (DUK_ISNAN(d)) { + duk_push_hstring_stridx(thr, DUK_STRIDX_INVALID_DATE); + return 1; + } + DUK_ASSERT(DUK_ISFINITE(d)); + + /* formatters always get one-based month/day-of-month */ + duk_bi_date_timeval_to_parts(d, parts, NULL, DUK_DATE_FLAG_ONEBASED); + DUK_ASSERT(parts[DUK_DATE_IDX_MONTH] >= 1 && parts[DUK_DATE_IDX_MONTH] <= 12); + DUK_ASSERT(parts[DUK_DATE_IDX_DAY] >= 1 && parts[DUK_DATE_IDX_DAY] <= 31); + + if (flags & DUK_DATE_FLAG_TOSTRING_LOCALE) { + /* try locale specific formatter; if it refuses to format the + * string, fall back to an ISO 8601 formatted value in local + * time. + */ +#if defined(DUK_USE_DATE_FORMAT_STRING) + /* Contract, either: + * - Push string to value stack and return 1 + * - Don't push anything and return 0 + */ + + rc = DUK_USE_DATE_FORMAT_STRING(thr, parts, tzoffset, flags); + if (rc != 0) { + return 1; + } +#else + /* No locale specific formatter; this is OK, we fall back + * to ISO 8601. + */ +#endif + } + + /* Different calling convention than above used because the helper + * is shared. + */ + duk__format_parts_iso8601(parts, tzoffset, flags, buf); + duk_push_string(thr, (const char *) buf); + return 1; +} + +/* Helper for component getter calls: check 'this' binding, get the + * internal time value, split it into parts (either as UTC time or + * local time), push a specified component as a return value to the + * value stack and return 1 (caller can then tail call us). + */ +DUK_LOCAL duk_ret_t duk__get_part_helper(duk_hthread *thr, duk_small_uint_t flags_and_idx) { + duk_double_t d; + duk_int_t parts[DUK_DATE_IDX_NUM_PARTS]; + duk_small_uint_t idx_part = (duk_small_uint_t) (flags_and_idx >> DUK_DATE_FLAG_VALUE_SHIFT); /* unpack args */ + + DUK_ASSERT_DISABLE(idx_part >= 0); /* unsigned */ + DUK_ASSERT(idx_part < DUK_DATE_IDX_NUM_PARTS); + + d = duk__push_this_get_timeval(thr, flags_and_idx); + if (DUK_ISNAN(d)) { + duk_push_nan(thr); + return 1; + } + DUK_ASSERT(DUK_ISFINITE(d)); + + duk_bi_date_timeval_to_parts(d, parts, NULL, flags_and_idx); /* no need to mask idx portion */ + + /* Setter APIs detect special year numbers (0...99) and apply a +1900 + * only in certain cases. The legacy getYear() getter applies -1900 + * unconditionally. + */ + duk_push_int(thr, (flags_and_idx & DUK_DATE_FLAG_SUB1900) ? parts[idx_part] - 1900 : parts[idx_part]); + return 1; +} + +/* Helper for component setter calls: check 'this' binding, get the + * internal time value, split it into parts (either as UTC time or + * local time), modify one or more components as specified, recompute + * the time value, set it as the internal value. Finally, push the + * new time value as a return value to the value stack and return 1 + * (caller can then tail call us). + */ +DUK_LOCAL duk_ret_t duk__set_part_helper(duk_hthread *thr, duk_small_uint_t flags_and_maxnargs) { + duk_double_t d; + duk_int_t parts[DUK_DATE_IDX_NUM_PARTS]; + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + duk_idx_t nargs; + duk_small_uint_t maxnargs = (duk_small_uint_t) (flags_and_maxnargs >> DUK_DATE_FLAG_VALUE_SHIFT); /* unpack args */ + duk_small_uint_t idx_first, idx; + duk_small_uint_t i; + + nargs = duk_get_top(thr); + d = duk__push_this_get_timeval(thr, flags_and_maxnargs); + DUK_ASSERT(DUK_ISFINITE(d) || DUK_ISNAN(d)); + + if (DUK_ISFINITE(d)) { + duk_bi_date_timeval_to_parts(d, parts, dparts, flags_and_maxnargs); + } else { + /* NaN timevalue: we need to coerce the arguments, but + * the resulting internal timestamp needs to remain NaN. + * This works but is not pretty: parts and dparts will + * be partially uninitialized, but we only write to them. + */ + } + + /* + * Determining which datetime components to overwrite based on + * stack arguments is a bit complicated, but important to factor + * out from setters themselves for compactness. + * + * If DUK_DATE_FLAG_TIMESETTER, maxnargs indicates setter type: + * + * 1 -> millisecond + * 2 -> second, [millisecond] + * 3 -> minute, [second], [millisecond] + * 4 -> hour, [minute], [second], [millisecond] + * + * Else: + * + * 1 -> date + * 2 -> month, [date] + * 3 -> year, [month], [date] + * + * By comparing nargs and maxnargs (and flags) we know which + * components to override. We rely on part index ordering. + */ + + if (flags_and_maxnargs & DUK_DATE_FLAG_TIMESETTER) { + DUK_ASSERT(maxnargs >= 1 && maxnargs <= 4); + idx_first = DUK_DATE_IDX_MILLISECOND - (maxnargs - 1); + } else { + DUK_ASSERT(maxnargs >= 1 && maxnargs <= 3); + idx_first = DUK_DATE_IDX_DAY - (maxnargs - 1); + } + DUK_ASSERT_DISABLE(idx_first >= 0); /* unsigned */ + DUK_ASSERT(idx_first < DUK_DATE_IDX_NUM_PARTS); + + for (i = 0; i < maxnargs; i++) { + if ((duk_idx_t) i >= nargs) { + /* no argument given -> leave components untouched */ + break; + } + idx = idx_first + i; + DUK_ASSERT_DISABLE(idx >= 0); /* unsigned */ + DUK_ASSERT(idx < DUK_DATE_IDX_NUM_PARTS); + + if (idx == DUK_DATE_IDX_YEAR && (flags_and_maxnargs & DUK_DATE_FLAG_YEAR_FIXUP)) { + duk__twodigit_year_fixup(thr, (duk_idx_t) i); + } + + dparts[idx] = duk_to_number(thr, (duk_idx_t) i); + + if (idx == DUK_DATE_IDX_DAY) { + /* Day-of-month is one-based in the API, but zero-based + * internally, so fix here. Note that month is zero-based + * both in the API and internally. + */ + /* SCANBUILD: complains about use of uninitialized values. + * The complaint is correct, but operating in undefined + * values here is intentional in some cases and the caller + * ignores the results. + */ + dparts[idx] -= 1.0; + } + } + + /* Leaves new timevalue on stack top and returns 1, which is correct + * for part setters. + */ + if (DUK_ISFINITE(d)) { + return duk__set_this_timeval_from_dparts(thr, dparts, flags_and_maxnargs); + } else { + /* Internal timevalue is already NaN, so don't touch it. */ + duk_push_nan(thr); + return 1; + } +} + +/* Apply ToNumber() to specified index; if ToInteger(val) in [0,99], add + * 1900 and replace value at idx_val. + */ +DUK_LOCAL void duk__twodigit_year_fixup(duk_hthread *thr, duk_idx_t idx_val) { + duk_double_t d; + + /* XXX: idx_val would fit into 16 bits, but using duk_small_uint_t + * might not generate better code due to casting. + */ + + /* E5 Sections 15.9.3.1, B.2.4, B.2.5 */ + duk_to_number(thr, idx_val); + if (duk_is_nan(thr, idx_val)) { + return; + } + duk_dup(thr, idx_val); + duk_to_int(thr, -1); + d = duk_get_number(thr, -1); /* get as double to handle huge numbers correctly */ + if (d >= 0.0 && d <= 99.0) { + d += 1900.0; + duk_push_number(thr, d); + duk_replace(thr, idx_val); + } + duk_pop(thr); +} + +/* Set datetime parts from stack arguments, defaulting any missing values. + * Day-of-week is not set; it is not required when setting the time value. + */ +DUK_LOCAL void duk__set_parts_from_args(duk_hthread *thr, duk_double_t *dparts, duk_idx_t nargs) { + duk_double_t d; + duk_small_uint_t i; + duk_small_uint_t idx; + + /* Causes a ToNumber() coercion, but doesn't break coercion order since + * year is coerced first anyway. + */ + duk__twodigit_year_fixup(thr, 0); + + /* There are at most 7 args, but we use 8 here so that also + * DUK_DATE_IDX_WEEKDAY gets initialized (to zero) to avoid the potential + * for any Valgrind gripes later. + */ + for (i = 0; i < 8; i++) { + /* Note: rely on index ordering */ + idx = DUK_DATE_IDX_YEAR + i; + if ((duk_idx_t) i < nargs) { + d = duk_to_number(thr, (duk_idx_t) i); + if (idx == DUK_DATE_IDX_DAY) { + /* Convert day from one-based to zero-based (internal). This may + * cause the day part to be negative, which is OK. + */ + d -= 1.0; + } + } else { + /* All components default to 0 except day-of-month which defaults + * to 1. However, because our internal day-of-month is zero-based, + * it also defaults to zero here. + */ + d = 0.0; + } + dparts[idx] = d; + } + + DUK_DDD(DUK_DDDPRINT("parts from args -> %lf %lf %lf %lf %lf %lf %lf %lf", + (double) dparts[0], (double) dparts[1], + (double) dparts[2], (double) dparts[3], + (double) dparts[4], (double) dparts[5], + (double) dparts[6], (double) dparts[7])); +} + +/* + * Indirect magic value lookup for Date methods. + * + * Date methods don't put their control flags into the function magic value + * because they wouldn't fit into a LIGHTFUNC's magic field. Instead, the + * magic value is set to an index pointing to the array of control flags + * below. + * + * This must be kept in strict sync with genbuiltins.py! + */ + +static duk_uint16_t duk__date_magics[] = { + /* 0: toString */ + DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_LOCALTIME, + + /* 1: toDateString */ + DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_LOCALTIME, + + /* 2: toTimeString */ + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_LOCALTIME, + + /* 3: toLocaleString */ + DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_TOSTRING_LOCALE + DUK_DATE_FLAG_LOCALTIME, + + /* 4: toLocaleDateString */ + DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_LOCALE + DUK_DATE_FLAG_LOCALTIME, + + /* 5: toLocaleTimeString */ + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_TOSTRING_LOCALE + DUK_DATE_FLAG_LOCALTIME, + + /* 6: toUTCString */ + DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME, + + /* 7: toISOString */ + DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_NAN_TO_RANGE_ERROR + DUK_DATE_FLAG_SEP_T, + + /* 8: getFullYear */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_YEAR << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 9: getUTCFullYear */ + 0 + (DUK_DATE_IDX_YEAR << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 10: getMonth */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_MONTH << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 11: getUTCMonth */ + 0 + (DUK_DATE_IDX_MONTH << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 12: getDate */ + DUK_DATE_FLAG_ONEBASED + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_DAY << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 13: getUTCDate */ + DUK_DATE_FLAG_ONEBASED + (DUK_DATE_IDX_DAY << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 14: getDay */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_WEEKDAY << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 15: getUTCDay */ + 0 + (DUK_DATE_IDX_WEEKDAY << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 16: getHours */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_HOUR << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 17: getUTCHours */ + 0 + (DUK_DATE_IDX_HOUR << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 18: getMinutes */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_MINUTE << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 19: getUTCMinutes */ + 0 + (DUK_DATE_IDX_MINUTE << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 20: getSeconds */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_SECOND << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 21: getUTCSeconds */ + 0 + (DUK_DATE_IDX_SECOND << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 22: getMilliseconds */ + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_MILLISECOND << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 23: getUTCMilliseconds */ + 0 + (DUK_DATE_IDX_MILLISECOND << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 24: setMilliseconds */ + DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (1 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 25: setUTCMilliseconds */ + DUK_DATE_FLAG_TIMESETTER + (1 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 26: setSeconds */ + DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (2 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 27: setUTCSeconds */ + DUK_DATE_FLAG_TIMESETTER + (2 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 28: setMinutes */ + DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (3 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 29: setUTCMinutes */ + DUK_DATE_FLAG_TIMESETTER + (3 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 30: setHours */ + DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (4 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 31: setUTCHours */ + DUK_DATE_FLAG_TIMESETTER + (4 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 32: setDate */ + DUK_DATE_FLAG_LOCALTIME + (1 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 33: setUTCDate */ + 0 + (1 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 34: setMonth */ + DUK_DATE_FLAG_LOCALTIME + (2 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 35: setUTCMonth */ + 0 + (2 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 36: setFullYear */ + DUK_DATE_FLAG_NAN_TO_ZERO + DUK_DATE_FLAG_LOCALTIME + (3 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 37: setUTCFullYear */ + DUK_DATE_FLAG_NAN_TO_ZERO + (3 << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 38: getYear */ + DUK_DATE_FLAG_LOCALTIME + DUK_DATE_FLAG_SUB1900 + (DUK_DATE_IDX_YEAR << DUK_DATE_FLAG_VALUE_SHIFT), + + /* 39: setYear */ + DUK_DATE_FLAG_NAN_TO_ZERO + DUK_DATE_FLAG_YEAR_FIXUP + (3 << DUK_DATE_FLAG_VALUE_SHIFT), +}; + +DUK_LOCAL duk_small_uint_t duk__date_get_indirect_magic(duk_hthread *thr) { + duk_small_uint_t magicidx = (duk_small_uint_t) duk_get_current_magic(thr); + DUK_ASSERT(magicidx < (duk_small_int_t) (sizeof(duk__date_magics) / sizeof(duk_uint16_t))); + return (duk_small_uint_t) duk__date_magics[magicidx]; +} + +#if defined(DUK_USE_DATE_BUILTIN) +/* + * Constructor calls + */ + +DUK_INTERNAL duk_ret_t duk_bi_date_constructor(duk_hthread *thr) { + duk_idx_t nargs = duk_get_top(thr); + duk_bool_t is_cons = duk_is_constructor_call(thr); + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + duk_double_t d; + + DUK_DDD(DUK_DDDPRINT("Date constructor, nargs=%ld, is_cons=%ld", (long) nargs, (long) is_cons)); + + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DATE), + DUK_BIDX_DATE_PROTOTYPE); + + /* Unlike most built-ins, the internal [[PrimitiveValue]] of a Date + * is mutable. + */ + + if (nargs == 0 || !is_cons) { + d = duk__timeclip(duk_time_get_ecmascript_time_nofrac(thr)); + duk_push_number(thr, d); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_W); + if (!is_cons) { + /* called as a normal function: return new Date().toString() */ + duk_to_string(thr, -1); + } + return 1; + } else if (nargs == 1) { + const char *str; + duk_to_primitive(thr, 0, DUK_HINT_NONE); + str = duk_get_string_notsymbol(thr, 0); + if (str) { + duk__parse_string(thr, str); + duk_replace(thr, 0); /* may be NaN */ + } + d = duk__timeclip(duk_to_number(thr, 0)); /* symbols fail here */ + duk_push_number(thr, d); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_W); + return 1; + } + + duk__set_parts_from_args(thr, dparts, nargs); + + /* Parts are in local time, convert when setting. */ + + (void) duk__set_this_timeval_from_dparts(thr, dparts, DUK_DATE_FLAG_LOCALTIME /*flags*/); /* -> [ ... this timeval ] */ + duk_pop(thr); /* -> [ ... this ] */ + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_date_constructor_parse(duk_hthread *thr) { + return duk__parse_string(thr, duk_to_string(thr, 0)); +} + +DUK_INTERNAL duk_ret_t duk_bi_date_constructor_utc(duk_hthread *thr) { + duk_idx_t nargs = duk_get_top(thr); + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + duk_double_t d; + + /* Behavior for nargs < 2 is implementation dependent: currently we'll + * set a NaN time value (matching V8 behavior) in this case. + */ + + if (nargs < 2) { + duk_push_nan(thr); + } else { + duk__set_parts_from_args(thr, dparts, nargs); + d = duk_bi_date_get_timeval_from_dparts(dparts, 0 /*flags*/); + duk_push_number(thr, d); + } + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_date_constructor_now(duk_hthread *thr) { + duk_double_t d; + + d = duk_time_get_ecmascript_time_nofrac(thr); + DUK_ASSERT(duk__timeclip(d) == d); /* TimeClip() should never be necessary */ + duk_push_number(thr, d); + return 1; +} + +/* + * String/JSON conversions + * + * Human readable conversions are now basically ISO 8601 with a space + * (instead of 'T') as the date/time separator. This is a good baseline + * and is platform independent. + * + * A shared native helper to provide many conversions. Magic value contains + * a set of flags. The helper provides: + * + * toString() + * toDateString() + * toTimeString() + * toLocaleString() + * toLocaleDateString() + * toLocaleTimeString() + * toUTCString() + * toISOString() + * + * Notes: + * + * - Date.prototype.toGMTString() and Date.prototype.toUTCString() are + * required to be the same ECMAScript function object (!), so it is + * omitted from here. + * + * - Date.prototype.toUTCString(): E5.1 specification does not require a + * specific format, but result should be human readable. The + * specification suggests using ISO 8601 format with a space (instead + * of 'T') separator if a more human readable format is not available. + * + * - Date.prototype.toISOString(): unlike other conversion functions, + * toISOString() requires a RangeError for invalid date values. + */ + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_tostring_shared(duk_hthread *thr) { + duk_small_uint_t flags = duk__date_get_indirect_magic(thr); + return duk__to_string_helper(thr, flags); +} + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_value_of(duk_hthread *thr) { + /* This native function is also used for Date.prototype.getTime() + * as their behavior is identical. + */ + + duk_double_t d = duk__push_this_get_timeval(thr, 0 /*flags*/); /* -> [ this ] */ + DUK_ASSERT(DUK_ISFINITE(d) || DUK_ISNAN(d)); + duk_push_number(thr, d); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_to_json(duk_hthread *thr) { + /* Note: toJSON() is a generic function which works even if 'this' + * is not a Date. The sole argument is ignored. + */ + + duk_push_this(thr); + duk_to_object(thr, -1); + + duk_dup_top(thr); + duk_to_primitive(thr, -1, DUK_HINT_NUMBER); + if (duk_is_number(thr, -1)) { + duk_double_t d = duk_get_number(thr, -1); + if (!DUK_ISFINITE(d)) { + duk_push_null(thr); + return 1; + } + } + duk_pop(thr); + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_TO_ISO_STRING); + duk_dup_m2(thr); /* -> [ O toIsoString O ] */ + duk_call_method(thr, 0); + return 1; +} + +/* + * Getters. + * + * Implementing getters is quite easy. The internal time value is either + * NaN, or represents milliseconds (without fractions) from Jan 1, 1970. + * The internal time value can be converted to integer parts, and each + * part will be normalized and will fit into a 32-bit signed integer. + * + * A shared native helper to provide all getters. Magic value contains + * a set of flags and also packs the date component index argument. The + * helper provides: + * + * getFullYear() + * getUTCFullYear() + * getMonth() + * getUTCMonth() + * getDate() + * getUTCDate() + * getDay() + * getUTCDay() + * getHours() + * getUTCHours() + * getMinutes() + * getUTCMinutes() + * getSeconds() + * getUTCSeconds() + * getMilliseconds() + * getUTCMilliseconds() + * getYear() + * + * Notes: + * + * - Date.prototype.getDate(): 'date' means day-of-month, and is + * zero-based in internal calculations but public API expects it to + * be one-based. + * + * - Date.prototype.getTime() and Date.prototype.valueOf() have identical + * behavior. They have separate function objects, but share the same C + * function (duk_bi_date_prototype_value_of). + */ + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_get_shared(duk_hthread *thr) { + duk_small_uint_t flags_and_idx = duk__date_get_indirect_magic(thr); + return duk__get_part_helper(thr, flags_and_idx); +} + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_get_timezone_offset(duk_hthread *thr) { + /* + * Return (t - LocalTime(t)) in minutes: + * + * t - LocalTime(t) = t - (t + LocalTZA + DaylightSavingTA(t)) + * = -(LocalTZA + DaylightSavingTA(t)) + * + * where DaylightSavingTA() is checked for time 't'. + * + * Note that the sign of the result is opposite to common usage, + * e.g. for EE(S)T which normally is +2h or +3h from UTC, this + * function returns -120 or -180. + * + */ + + duk_double_t d; + duk_int_t tzoffset; + + /* Note: DST adjustment is determined using UTC time. */ + d = duk__push_this_get_timeval(thr, 0 /*flags*/); + DUK_ASSERT(DUK_ISFINITE(d) || DUK_ISNAN(d)); + if (DUK_ISNAN(d)) { + duk_push_nan(thr); + } else { + DUK_ASSERT(DUK_ISFINITE(d)); + tzoffset = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d); + duk_push_int(thr, -tzoffset / 60); + } + return 1; +} + +/* + * Setters. + * + * Setters are a bit more complicated than getters. Component setters + * break down the current time value into its (normalized) component + * parts, replace one or more components with -unnormalized- new values, + * and the components are then converted back into a time value. As an + * example of using unnormalized values: + * + * var d = new Date(1234567890); + * + * is equivalent to: + * + * var d = new Date(0); + * d.setUTCMilliseconds(1234567890); + * + * A shared native helper to provide almost all setters. Magic value + * contains a set of flags and also packs the "maxnargs" argument. The + * helper provides: + * + * setMilliseconds() + * setUTCMilliseconds() + * setSeconds() + * setUTCSeconds() + * setMinutes() + * setUTCMinutes() + * setHours() + * setUTCHours() + * setDate() + * setUTCDate() + * setMonth() + * setUTCMonth() + * setFullYear() + * setUTCFullYear() + * setYear() + * + * Notes: + * + * - Date.prototype.setYear() (Section B addition): special year check + * is omitted. NaN / Infinity will just flow through and ultimately + * result in a NaN internal time value. + * + * - Date.prototype.setYear() does not have optional arguments for + * setting month and day-in-month (like setFullYear()), but we indicate + * 'maxnargs' to be 3 to get the year written to the correct component + * index in duk__set_part_helper(). The function has nargs == 1, so only + * the year will be set regardless of actual argument count. + */ + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_set_shared(duk_hthread *thr) { + duk_small_uint_t flags_and_maxnargs = duk__date_get_indirect_magic(thr); + return duk__set_part_helper(thr, flags_and_maxnargs); +} + +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_set_time(duk_hthread *thr) { + duk_double_t d; + + (void) duk__push_this_get_timeval(thr, 0 /*flags*/); /* -> [ timeval this ] */ + d = duk__timeclip(duk_to_number(thr, 0)); + duk_push_number(thr, d); + duk_dup_top(thr); + duk_put_prop_stridx_short(thr, -3, DUK_STRIDX_INT_VALUE); /* -> [ timeval this timeval ] */ + + return 1; +} + +/* + * Misc. + */ + +#if defined(DUK_USE_SYMBOL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_date_prototype_toprimitive(duk_hthread *thr) { + duk_size_t hintlen; + const char *hintstr; + duk_int_t hint; + + /* Invokes OrdinaryToPrimitive() with suitable hint. Note that the + * method is generic, and works on non-Date arguments too. + * + * https://www.ecma-international.org/ecma-262/6.0/#sec-date.prototype-@@toprimitive + */ + + duk_push_this(thr); + duk_require_object(thr, -1); + DUK_ASSERT_TOP(thr, 2); + + hintstr = duk_require_lstring(thr, 0, &hintlen); + if ((hintlen == 6 && DUK_STRCMP(hintstr, "string") == 0) || + (hintlen == 7 && DUK_STRCMP(hintstr, "default") == 0)) { + hint = DUK_HINT_STRING; + } else if (hintlen == 6 && DUK_STRCMP(hintstr, "number") == 0) { + hint = DUK_HINT_NUMBER; + } else { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + duk_to_primitive_ordinary(thr, -1, hint); + return 1; +} +#endif /* DUK_USE_SYMBOL_BUILTIN */ + +#endif /* DUK_USE_DATE_BUILTIN */ + +/* automatic undefs */ +#undef DUK__CF_ACCEPT +#undef DUK__CF_ACCEPT_NUL +#undef DUK__CF_NEG +#undef DUK__DPRINT_DPARTS +#undef DUK__DPRINT_PARTS +#undef DUK__DPRINT_PARTS_AND_DPARTS +#undef DUK__LOCAL_TZOFFSET_MAXITER +#undef DUK__NUM_ISO8601_PARSER_PARTS +#undef DUK__PACK_RULE +#undef DUK__PI_DAY +#undef DUK__PI_HOUR +#undef DUK__PI_MILLISECOND +#undef DUK__PI_MINUTE +#undef DUK__PI_MONTH +#undef DUK__PI_SECOND +#undef DUK__PI_TZHOUR +#undef DUK__PI_TZMINUTE +#undef DUK__PI_YEAR +#undef DUK__PM_DAY +#undef DUK__PM_HOUR +#undef DUK__PM_MILLISECOND +#undef DUK__PM_MINUTE +#undef DUK__PM_MONTH +#undef DUK__PM_SECOND +#undef DUK__PM_TZHOUR +#undef DUK__PM_TZMINUTE +#undef DUK__PM_YEAR +#undef DUK__RULE_MASK_PART_SEP +#undef DUK__SI_COLON +#undef DUK__SI_MINUS +#undef DUK__SI_NUL +#undef DUK__SI_PERIOD +#undef DUK__SI_PLUS +#undef DUK__SI_SPACE +#undef DUK__SI_T +#undef DUK__SI_Z +#undef DUK__SM_COLON +#undef DUK__SM_MINUS +#undef DUK__SM_NUL +#undef DUK__SM_PERIOD +#undef DUK__SM_PLUS +#undef DUK__SM_SPACE +#undef DUK__SM_T +#undef DUK__SM_Z +#undef DUK__UNPACK_RULE +#undef DUK__WEEKDAY_MOD_ADDER +#undef DUK__YEAR +#line 1 "duk_bi_date_unix.c" +/* + * Unix-like Date providers + * + * Generally useful Unix / POSIX / ANSI Date providers. + */ + +/* #include duk_internal.h -> already included */ + +/* The necessary #includes are in place in duk_config.h. */ + +/* Buffer sizes for some UNIX calls. Larger than strictly necessary + * to avoid Valgrind errors. + */ +#define DUK__STRPTIME_BUF_SIZE 64 +#define DUK__STRFTIME_BUF_SIZE 64 + +#if defined(DUK_USE_DATE_NOW_GETTIMEOFDAY) +/* Get current ECMAScript time (= UNIX/Posix time, but in milliseconds). */ +DUK_INTERNAL duk_double_t duk_bi_date_get_now_gettimeofday(void) { + struct timeval tv; + duk_double_t d; + + if (gettimeofday(&tv, NULL) != 0) { + DUK_D(DUK_DPRINT("gettimeofday() failed")); + return 0.0; + } + + /* As of Duktape 2.2.0 allow fractions. */ + d = ((duk_double_t) tv.tv_sec) * 1000.0 + + ((duk_double_t) tv.tv_usec) / 1000.0; + + return d; +} +#endif /* DUK_USE_DATE_NOW_GETTIMEOFDAY */ + +#if defined(DUK_USE_DATE_NOW_TIME) +/* Not a very good provider: only full seconds are available. */ +DUK_INTERNAL duk_double_t duk_bi_date_get_now_time(void) { + time_t t; + + t = time(NULL); + if (t == (time_t) -1) { + DUK_D(DUK_DPRINT("time() failed")); + return 0.0; + } + return ((duk_double_t) t) * 1000.0; +} +#endif /* DUK_USE_DATE_NOW_TIME */ + +#if defined(DUK_USE_DATE_TZO_GMTIME) || defined(DUK_USE_DATE_TZO_GMTIME_R) || defined(DUK_USE_DATE_TZO_GMTIME_S) +/* Get local time offset (in seconds) for a certain (UTC) instant 'd'. */ +DUK_INTERNAL duk_int_t duk_bi_date_get_local_tzoffset_gmtime(duk_double_t d) { + time_t t, t1, t2; + duk_int_t parts[DUK_DATE_IDX_NUM_PARTS]; + duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS]; + struct tm tms[2]; +#if defined(DUK_USE_DATE_TZO_GMTIME) + struct tm *tm_ptr; +#endif + + /* For NaN/inf, the return value doesn't matter. */ + if (!DUK_ISFINITE(d)) { + return 0; + } + + /* If not within ECMAScript range, some integer time calculations + * won't work correctly (and some asserts will fail), so bail out + * if so. This fixes test-bug-date-insane-setyear.js. There is + * a +/- 24h leeway in this range check to avoid a test262 corner + * case documented in test-bug-date-timeval-edges.js. + */ + if (!duk_bi_date_timeval_in_leeway_range(d)) { + DUK_DD(DUK_DDPRINT("timeval not within valid range, skip tzoffset computation to avoid integer overflows")); + return 0; + } + + /* + * This is a bit tricky to implement portably. The result depends + * on the timestamp (specifically, DST depends on the timestamp). + * If e.g. UNIX APIs are used, they'll have portability issues with + * very small and very large years. + * + * Current approach: + * + * - Stay within portable UNIX limits by using equivalent year mapping. + * Avoid year 1970 and 2038 as some conversions start to fail, at + * least on some platforms. Avoiding 1970 means that there are + * currently DST discrepancies for 1970. + * + * - Create a UTC and local time breakdowns from 't'. Then create + * a time_t using gmtime() and localtime() and compute the time + * difference between the two. + * + * Equivalent year mapping (E5 Section 15.9.1.8): + * + * If the host environment provides functionality for determining + * daylight saving time, the implementation of ECMAScript is free + * to map the year in question to an equivalent year (same + * leap-year-ness and same starting week day for the year) for which + * the host environment provides daylight saving time information. + * The only restriction is that all equivalent years should produce + * the same result. + * + * This approach is quite reasonable but not entirely correct, e.g. + * the specification also states (E5 Section 15.9.1.8): + * + * The implementation of ECMAScript should not try to determine + * whether the exact time was subject to daylight saving time, but + * just whether daylight saving time would have been in effect if + * the _current daylight saving time algorithm_ had been used at the + * time. This avoids complications such as taking into account the + * years that the locale observed daylight saving time year round. + * + * Since we rely on the platform APIs for conversions between local + * time and UTC, we can't guarantee the above. Rather, if the platform + * has historical DST rules they will be applied. This seems to be the + * general preferred direction in ECMAScript standardization (or at least + * implementations) anyway, and even the equivalent year mapping should + * be disabled if the platform is known to handle DST properly for the + * full ECMAScript range. + * + * The following has useful discussion and links: + * + * https://bugzilla.mozilla.org/show_bug.cgi?id=351066 + */ + + duk_bi_date_timeval_to_parts(d, parts, dparts, DUK_DATE_FLAG_EQUIVYEAR /*flags*/); + DUK_ASSERT(parts[DUK_DATE_IDX_YEAR] >= 1970 && parts[DUK_DATE_IDX_YEAR] <= 2038); + + d = duk_bi_date_get_timeval_from_dparts(dparts, 0 /*flags*/); + DUK_ASSERT(d >= 0 && d < 2147483648.0 * 1000.0); /* unsigned 31-bit range */ + t = (time_t) (d / 1000.0); + DUK_DDD(DUK_DDDPRINT("timeval: %lf -> time_t %ld", (double) d, (long) t)); + + duk_memzero((void *) tms, sizeof(struct tm) * 2); + +#if defined(DUK_USE_DATE_TZO_GMTIME_R) + (void) gmtime_r(&t, &tms[0]); + (void) localtime_r(&t, &tms[1]); +#elif defined(DUK_USE_DATE_TZO_GMTIME_S) + (void) gmtime_s(&t, &tms[0]); + (void) localtime_s(&t, &tms[1]); +#elif defined(DUK_USE_DATE_TZO_GMTIME) + tm_ptr = gmtime(&t); + duk_memcpy((void *) &tms[0], tm_ptr, sizeof(struct tm)); + tm_ptr = localtime(&t); + duk_memcpy((void *) &tms[1], tm_ptr, sizeof(struct tm)); +#else +#error internal error +#endif + DUK_DDD(DUK_DDDPRINT("gmtime result: tm={sec:%ld,min:%ld,hour:%ld,mday:%ld,mon:%ld,year:%ld," + "wday:%ld,yday:%ld,isdst:%ld}", + (long) tms[0].tm_sec, (long) tms[0].tm_min, (long) tms[0].tm_hour, + (long) tms[0].tm_mday, (long) tms[0].tm_mon, (long) tms[0].tm_year, + (long) tms[0].tm_wday, (long) tms[0].tm_yday, (long) tms[0].tm_isdst)); + DUK_DDD(DUK_DDDPRINT("localtime result: tm={sec:%ld,min:%ld,hour:%ld,mday:%ld,mon:%ld,year:%ld," + "wday:%ld,yday:%ld,isdst:%ld}", + (long) tms[1].tm_sec, (long) tms[1].tm_min, (long) tms[1].tm_hour, + (long) tms[1].tm_mday, (long) tms[1].tm_mon, (long) tms[1].tm_year, + (long) tms[1].tm_wday, (long) tms[1].tm_yday, (long) tms[1].tm_isdst)); + + /* tm_isdst is both an input and an output to mktime(), use 0 to + * avoid DST handling in mktime(): + * - https://github.com/svaarala/duktape/issues/406 + * - http://stackoverflow.com/questions/8558919/mktime-and-tm-isdst + */ + tms[0].tm_isdst = 0; + tms[1].tm_isdst = 0; + t1 = mktime(&tms[0]); /* UTC */ + t2 = mktime(&tms[1]); /* local */ + if (t1 == (time_t) -1 || t2 == (time_t) -1) { + /* This check used to be for (t < 0) but on some platforms + * time_t is unsigned and apparently the proper way to detect + * an mktime() error return is the cast above. See e.g.: + * http://pubs.opengroup.org/onlinepubs/009695299/functions/mktime.html + */ + goto mktime_error; + } + DUK_DDD(DUK_DDDPRINT("t1=%ld (utc), t2=%ld (local)", (long) t1, (long) t2)); + + /* Compute final offset in seconds, positive if local time ahead of + * UTC (returned value is UTC-to-local offset). + * + * difftime() returns a double, so coercion to int generates quite + * a lot of code. Direct subtraction is not portable, however. + * XXX: allow direct subtraction on known platforms. + */ +#if 0 + return (duk_int_t) (t2 - t1); +#endif + return (duk_int_t) difftime(t2, t1); + + mktime_error: + /* XXX: return something more useful, so that caller can throw? */ + DUK_D(DUK_DPRINT("mktime() failed, d=%lf", (double) d)); + return 0; +} +#endif /* DUK_USE_DATE_TZO_GMTIME */ + +#if defined(DUK_USE_DATE_PRS_STRPTIME) +DUK_INTERNAL duk_bool_t duk_bi_date_parse_string_strptime(duk_hthread *thr, const char *str) { + struct tm tm; + time_t t; + char buf[DUK__STRPTIME_BUF_SIZE]; + + /* Copy to buffer with slack to avoid Valgrind gripes from strptime. */ + DUK_ASSERT(str != NULL); + duk_memzero(buf, sizeof(buf)); /* valgrind whine without this */ + DUK_SNPRINTF(buf, sizeof(buf), "%s", (const char *) str); + buf[sizeof(buf) - 1] = (char) 0; + + DUK_DDD(DUK_DDDPRINT("parsing: '%s'", (const char *) buf)); + + duk_memzero(&tm, sizeof(tm)); + if (strptime((const char *) buf, "%c", &tm) != NULL) { + DUK_DDD(DUK_DDDPRINT("before mktime: tm={sec:%ld,min:%ld,hour:%ld,mday:%ld,mon:%ld,year:%ld," + "wday:%ld,yday:%ld,isdst:%ld}", + (long) tm.tm_sec, (long) tm.tm_min, (long) tm.tm_hour, + (long) tm.tm_mday, (long) tm.tm_mon, (long) tm.tm_year, + (long) tm.tm_wday, (long) tm.tm_yday, (long) tm.tm_isdst)); + tm.tm_isdst = -1; /* negative: dst info not available */ + + t = mktime(&tm); + DUK_DDD(DUK_DDDPRINT("mktime() -> %ld", (long) t)); + if (t >= 0) { + duk_push_number(thr, ((duk_double_t) t) * 1000.0); + return 1; + } + } + + return 0; +} +#endif /* DUK_USE_DATE_PRS_STRPTIME */ + +#if defined(DUK_USE_DATE_PRS_GETDATE) +DUK_INTERNAL duk_bool_t duk_bi_date_parse_string_getdate(duk_hthread *thr, const char *str) { + struct tm tm; + duk_small_int_t rc; + time_t t; + + /* For this to work, DATEMSK must be set, so this is not very + * convenient for an embeddable interpreter. + */ + + duk_memzero(&tm, sizeof(struct tm)); + rc = (duk_small_int_t) getdate_r(str, &tm); + DUK_DDD(DUK_DDDPRINT("getdate_r() -> %ld", (long) rc)); + + if (rc == 0) { + t = mktime(&tm); + DUK_DDD(DUK_DDDPRINT("mktime() -> %ld", (long) t)); + if (t >= 0) { + duk_push_number(thr, (duk_double_t) t); + return 1; + } + } + + return 0; +} +#endif /* DUK_USE_DATE_PRS_GETDATE */ + +#if defined(DUK_USE_DATE_FMT_STRFTIME) +DUK_INTERNAL duk_bool_t duk_bi_date_format_parts_strftime(duk_hthread *thr, duk_int_t *parts, duk_int_t tzoffset, duk_small_uint_t flags) { + char buf[DUK__STRFTIME_BUF_SIZE]; + struct tm tm; + const char *fmt; + + DUK_UNREF(tzoffset); + + /* If the platform doesn't support the entire ECMAScript range, we need + * to return 0 so that the caller can fall back to the default formatter. + * + * For now, assume that if time_t is 8 bytes or more, the whole ECMAScript + * range is supported. For smaller time_t values (4 bytes in practice), + * assumes that the signed 32-bit range is supported. + * + * XXX: detect this more correctly per platform. The size of time_t is + * probably not an accurate guarantee of strftime() supporting or not + * supporting a large time range (the full ECMAScript range). + */ + if (sizeof(time_t) < 8 && + (parts[DUK_DATE_IDX_YEAR] < 1970 || parts[DUK_DATE_IDX_YEAR] > 2037)) { + /* be paranoid for 32-bit time values (even avoiding negative ones) */ + return 0; + } + + duk_memzero(&tm, sizeof(tm)); + tm.tm_sec = parts[DUK_DATE_IDX_SECOND]; + tm.tm_min = parts[DUK_DATE_IDX_MINUTE]; + tm.tm_hour = parts[DUK_DATE_IDX_HOUR]; + tm.tm_mday = parts[DUK_DATE_IDX_DAY]; /* already one-based */ + tm.tm_mon = parts[DUK_DATE_IDX_MONTH] - 1; /* one-based -> zero-based */ + tm.tm_year = parts[DUK_DATE_IDX_YEAR] - 1900; + tm.tm_wday = parts[DUK_DATE_IDX_WEEKDAY]; + tm.tm_isdst = 0; + + duk_memzero(buf, sizeof(buf)); + if ((flags & DUK_DATE_FLAG_TOSTRING_DATE) && (flags & DUK_DATE_FLAG_TOSTRING_TIME)) { + fmt = "%c"; + } else if (flags & DUK_DATE_FLAG_TOSTRING_DATE) { + fmt = "%x"; + } else { + DUK_ASSERT(flags & DUK_DATE_FLAG_TOSTRING_TIME); + fmt = "%X"; + } + (void) strftime(buf, sizeof(buf) - 1, fmt, &tm); + DUK_ASSERT(buf[sizeof(buf) - 1] == 0); + + duk_push_string(thr, buf); + return 1; +} +#endif /* DUK_USE_DATE_FMT_STRFTIME */ + +#if defined(DUK_USE_GET_MONOTONIC_TIME_CLOCK_GETTIME) +DUK_INTERNAL duk_double_t duk_bi_date_get_monotonic_time_clock_gettime(void) { + struct timespec ts; + + if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { + return (duk_double_t) ts.tv_sec * 1000.0 + (duk_double_t) ts.tv_nsec / 1000000.0; + } else { + DUK_D(DUK_DPRINT("clock_gettime(CLOCK_MONOTONIC) failed")); + return 0.0; + } +} +#endif + +/* automatic undefs */ +#undef DUK__STRFTIME_BUF_SIZE +#undef DUK__STRPTIME_BUF_SIZE +#line 1 "duk_bi_date_windows.c" +/* + * Windows Date providers + * + * Platform specific links: + * + * - http://msdn.microsoft.com/en-us/library/windows/desktop/ms725473(v=vs.85).aspx + */ + +/* #include duk_internal.h -> already included */ + +/* The necessary #includes are in place in duk_config.h. */ + +#if defined(DUK_USE_DATE_NOW_WINDOWS) || defined(DUK_USE_DATE_TZO_WINDOWS) +/* Shared Windows helpers. */ +DUK_LOCAL void duk__convert_systime_to_ularge(const SYSTEMTIME *st, ULARGE_INTEGER *res) { + FILETIME ft; + if (SystemTimeToFileTime(st, &ft) == 0) { + DUK_D(DUK_DPRINT("SystemTimeToFileTime() failed, returning 0")); + res->QuadPart = 0; + } else { + res->LowPart = ft.dwLowDateTime; + res->HighPart = ft.dwHighDateTime; + } +} + +#if defined(DUK_USE_DATE_NOW_WINDOWS_SUBMS) +DUK_LOCAL void duk__convert_filetime_to_ularge(const FILETIME *ft, ULARGE_INTEGER *res) { + res->LowPart = ft->dwLowDateTime; + res->HighPart = ft->dwHighDateTime; +} +#endif /* DUK_USE_DATE_NOW_WINDOWS_SUBMS */ + +DUK_LOCAL void duk__set_systime_jan1970(SYSTEMTIME *st) { + duk_memzero((void *) st, sizeof(*st)); + st->wYear = 1970; + st->wMonth = 1; + st->wDayOfWeek = 4; /* not sure whether or not needed; Thursday */ + st->wDay = 1; + DUK_ASSERT(st->wHour == 0); + DUK_ASSERT(st->wMinute == 0); + DUK_ASSERT(st->wSecond == 0); + DUK_ASSERT(st->wMilliseconds == 0); +} +#endif /* defined(DUK_USE_DATE_NOW_WINDOWS) || defined(DUK_USE_DATE_TZO_WINDOWS) */ + +#if defined(DUK_USE_DATE_NOW_WINDOWS) +DUK_INTERNAL duk_double_t duk_bi_date_get_now_windows(void) { + /* Suggested step-by-step method from documentation of RtlTimeToSecondsSince1970: + * http://msdn.microsoft.com/en-us/library/windows/desktop/ms724928(v=vs.85).aspx + */ + SYSTEMTIME st1, st2; + ULARGE_INTEGER tmp1, tmp2; + + GetSystemTime(&st1); + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st1, &tmp1); + + duk__set_systime_jan1970(&st2); + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st2, &tmp2); + + /* Difference is in 100ns units, convert to milliseconds, keeping + * fractions since Duktape 2.2.0. This is only theoretical because + * SYSTEMTIME is limited to milliseconds. + */ + return (duk_double_t) ((LONGLONG) tmp1.QuadPart - (LONGLONG) tmp2.QuadPart) / 10000.0; +} +#endif /* DUK_USE_DATE_NOW_WINDOWS */ + +#if defined(DUK_USE_DATE_NOW_WINDOWS_SUBMS) +DUK_INTERNAL duk_double_t duk_bi_date_get_now_windows_subms(void) { + /* Variant of the basic algorithm using GetSystemTimePreciseAsFileTime() + * for more accuracy. + */ + FILETIME ft1; + SYSTEMTIME st2; + ULARGE_INTEGER tmp1, tmp2; + + GetSystemTimePreciseAsFileTime(&ft1); + duk__convert_filetime_to_ularge((const FILETIME *) &ft1, &tmp1); + + duk__set_systime_jan1970(&st2); + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st2, &tmp2); + + /* Difference is in 100ns units, convert to milliseconds, keeping + * fractions since Duktape 2.2.0. + */ + return (duk_double_t) ((LONGLONG) tmp1.QuadPart - (LONGLONG) tmp2.QuadPart) / 10000.0; +} +#endif /* DUK_USE_DATE_NOW_WINDOWS */ + +#if defined(DUK_USE_DATE_TZO_WINDOWS) +DUK_INTERNAL duk_int_t duk_bi_date_get_local_tzoffset_windows(duk_double_t d) { + SYSTEMTIME st1; + SYSTEMTIME st2; + SYSTEMTIME st3; + ULARGE_INTEGER tmp1; + ULARGE_INTEGER tmp2; + ULARGE_INTEGER tmp3; + FILETIME ft1; + BOOL ret; + + /* XXX: handling of timestamps outside Windows supported range. + * How does Windows deal with dates before 1600? Does windows + * support all ECMAScript years (like -200000 and +200000)? + * Should equivalent year mapping be used here too? If so, use + * a shared helper (currently integrated into timeval-to-parts). + */ + + /* Use the approach described in "Remarks" of FileTimeToLocalFileTime: + * http://msdn.microsoft.com/en-us/library/windows/desktop/ms724277(v=vs.85).aspx + */ + + duk__set_systime_jan1970(&st1); + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st1, &tmp1); + tmp2.QuadPart = (ULONGLONG) (d * 10000.0); /* millisec -> 100ns units since jan 1, 1970 */ + tmp2.QuadPart += tmp1.QuadPart; /* input 'd' in Windows UTC, 100ns units */ + + ft1.dwLowDateTime = tmp2.LowPart; + ft1.dwHighDateTime = tmp2.HighPart; + ret = FileTimeToSystemTime((const FILETIME *) &ft1, &st2); + if (!ret) { + DUK_D(DUK_DPRINT("FileTimeToSystemTime() failed, return tzoffset 0")); + return 0; + } + if (SystemTimeToTzSpecificLocalTime((LPTIME_ZONE_INFORMATION) NULL, &st2, &st3) == 0) { + DUK_D(DUK_DPRINT("SystemTimeToTzSpecificLocalTime() failed, return tzoffset 0")); + return 0; + } + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st3, &tmp3); + + /* Positive if local time ahead of UTC. */ + return (duk_int_t) (((LONGLONG) tmp3.QuadPart - (LONGLONG) tmp2.QuadPart) / DUK_I64_CONSTANT(10000000)); /* seconds */ +} +#endif /* DUK_USE_DATE_TZO_WINDOWS */ + +#if defined(DUK_USE_DATE_TZO_WINDOWS_NO_DST) +DUK_INTERNAL duk_int_t duk_bi_date_get_local_tzoffset_windows_no_dst(duk_double_t d) { + SYSTEMTIME st1; + SYSTEMTIME st2; + FILETIME ft1; + FILETIME ft2; + ULARGE_INTEGER tmp1; + ULARGE_INTEGER tmp2; + BOOL ret; + + /* Do a similar computation to duk_bi_date_get_local_tzoffset_windows + * but without accounting for daylight savings time. Use this on + * Windows platforms (like Durango) that don't support the + * SystemTimeToTzSpecificLocalTime() call. + */ + + /* current time not needed for this computation */ + DUK_UNREF(d); + + duk__set_systime_jan1970(&st1); + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st1, &tmp1); + + ft1.dwLowDateTime = tmp1.LowPart; + ft1.dwHighDateTime = tmp1.HighPart; + ret = FileTimeToLocalFileTime((const FILETIME *) &ft1, &ft2); + if (!ret) { + DUK_D(DUK_DPRINT("FileTimeToLocalFileTime() failed, return tzoffset 0")); + return 0; + } + + ret = FileTimeToSystemTime((const FILETIME *) &ft2, &st2); + if (!ret) { + DUK_D(DUK_DPRINT("FileTimeToSystemTime() failed, return tzoffset 0")); + return 0; + } + duk__convert_systime_to_ularge((const SYSTEMTIME *) &st2, &tmp2); + + return (duk_int_t) (((LONGLONG) tmp2.QuadPart - (LONGLONG) tmp1.QuadPart) / DUK_I64_CONSTANT(10000000)); /* seconds */ +} +#endif /* DUK_USE_DATE_TZO_WINDOWS_NO_DST */ + +#if defined(DUK_USE_GET_MONOTONIC_TIME_WINDOWS_QPC) +DUK_INTERNAL duk_double_t duk_bi_date_get_monotonic_time_windows_qpc(void) { + LARGE_INTEGER count, freq; + + /* There are legacy issues with QueryPerformanceCounter(): + * - Potential jumps: https://support.microsoft.com/en-us/help/274323/performance-counter-value-may-unexpectedly-leap-forward + * - Differences between cores (XP): https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx#qpc_support_in_windows_versions + * + * We avoid these by enabling QPC by default only for Vista or later. + */ + + if (QueryPerformanceCounter(&count) && QueryPerformanceFrequency(&freq)) { + /* XXX: QueryPerformanceFrequency() can be cached */ + return (duk_double_t) count.QuadPart / (duk_double_t) freq.QuadPart * 1000.0; + } else { + /* MSDN: "On systems that run Windows XP or later, the function + * will always succeed and will thus never return zero." + * Provide minimal error path just in case user enables this + * feature in pre-XP Windows. + */ + return 0.0; + } +} +#endif /* DUK_USE_GET_MONOTONIC_TIME_WINDOWS_QPC */ +#line 1 "duk_bi_duktape.c" +/* + * Duktape built-ins + * + * Size optimization note: it might seem that vararg multipurpose functions + * like fin(), enc(), and dec() are not very size optimal, but using a single + * user-visible ECMAScript function saves a lot of run-time footprint; each + * Function instance takes >100 bytes. Using a shared native helper and a + * 'magic' value won't save much if there are multiple Function instances + * anyway. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_DUKTAPE_BUILTIN) + +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_info(duk_hthread *thr) { + duk_inspect_value(thr, -1); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_act(duk_hthread *thr) { + duk_int_t level; + + level = duk_to_int(thr, 0); + duk_inspect_callstack_entry(thr, level); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_gc(duk_hthread *thr) { + duk_small_uint_t flags; + + flags = (duk_small_uint_t) duk_get_uint(thr, 0); + duk_heap_mark_and_sweep(thr->heap, flags); + + /* XXX: Not sure what the best return value would be in the API. + * Return true for now. + */ + duk_push_true(thr); + return 1; +} + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_fin(duk_hthread *thr) { + (void) duk_require_hobject(thr, 0); + if (duk_get_top(thr) >= 2) { + /* Set: currently a finalizer is disabled by setting it to + * undefined; this does not remove the property at the moment. + * The value could be type checked to be either a function + * or something else; if something else, the property could + * be deleted. Must use duk_set_finalizer() to keep + * DUK_HOBJECT_FLAG_HAVE_FINALIZER in sync. + */ + duk_set_top(thr, 2); + duk_set_finalizer(thr, 0); + return 0; + } else { + /* Get. */ + DUK_ASSERT(duk_get_top(thr) == 1); + duk_get_finalizer(thr, 0); + return 1; + } +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_enc(duk_hthread *thr) { + duk_hstring *h_str; + + /* Vararg function: must be careful to check/require arguments. + * The JSON helpers accept invalid indices and treat them like + * non-existent optional parameters. + */ + + h_str = duk_require_hstring(thr, 0); /* Could reject symbols, but no point: won't match comparisons. */ + duk_require_valid_index(thr, 1); + + if (h_str == DUK_HTHREAD_STRING_HEX(thr)) { + duk_set_top(thr, 2); + duk_hex_encode(thr, 1); + DUK_ASSERT_TOP(thr, 2); + } else if (h_str == DUK_HTHREAD_STRING_BASE64(thr)) { + duk_set_top(thr, 2); + duk_base64_encode(thr, 1); + DUK_ASSERT_TOP(thr, 2); +#if defined(DUK_USE_JSON_SUPPORT) && defined(DUK_USE_JX) + } else if (h_str == DUK_HTHREAD_STRING_JX(thr)) { + duk_bi_json_stringify_helper(thr, + 1 /*idx_value*/, + 2 /*idx_replacer*/, + 3 /*idx_space*/, + DUK_JSON_FLAG_EXT_CUSTOM | + DUK_JSON_FLAG_ASCII_ONLY | + DUK_JSON_FLAG_AVOID_KEY_QUOTES /*flags*/); +#endif +#if defined(DUK_USE_JSON_SUPPORT) && defined(DUK_USE_JC) + } else if (h_str == DUK_HTHREAD_STRING_JC(thr)) { + duk_bi_json_stringify_helper(thr, + 1 /*idx_value*/, + 2 /*idx_replacer*/, + 3 /*idx_space*/, + DUK_JSON_FLAG_EXT_COMPATIBLE | + DUK_JSON_FLAG_ASCII_ONLY /*flags*/); +#endif + } else { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_dec(duk_hthread *thr) { + duk_hstring *h_str; + + /* Vararg function: must be careful to check/require arguments. + * The JSON helpers accept invalid indices and treat them like + * non-existent optional parameters. + */ + + h_str = duk_require_hstring(thr, 0); /* Could reject symbols, but no point: won't match comparisons */ + duk_require_valid_index(thr, 1); + + if (h_str == DUK_HTHREAD_STRING_HEX(thr)) { + duk_set_top(thr, 2); + duk_hex_decode(thr, 1); + DUK_ASSERT_TOP(thr, 2); + } else if (h_str == DUK_HTHREAD_STRING_BASE64(thr)) { + duk_set_top(thr, 2); + duk_base64_decode(thr, 1); + DUK_ASSERT_TOP(thr, 2); +#if defined(DUK_USE_JSON_SUPPORT) && defined(DUK_USE_JX) + } else if (h_str == DUK_HTHREAD_STRING_JX(thr)) { + duk_bi_json_parse_helper(thr, + 1 /*idx_value*/, + 2 /*idx_replacer*/, + DUK_JSON_FLAG_EXT_CUSTOM /*flags*/); +#endif +#if defined(DUK_USE_JSON_SUPPORT) && defined(DUK_USE_JC) + } else if (h_str == DUK_HTHREAD_STRING_JC(thr)) { + duk_bi_json_parse_helper(thr, + 1 /*idx_value*/, + 2 /*idx_replacer*/, + DUK_JSON_FLAG_EXT_COMPATIBLE /*flags*/); +#endif + } else { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + return 1; +} + +/* + * Compact an object + */ + +DUK_INTERNAL duk_ret_t duk_bi_duktape_object_compact(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 1); + duk_compact(thr, 0); + return 1; /* return the argument object */ +} + +#endif /* DUK_USE_DUKTAPE_BUILTIN */ +#line 1 "duk_bi_encoding.c" +/* + * WHATWG Encoding API built-ins + * + * API specification: https://encoding.spec.whatwg.org/#api + * Web IDL: https://www.w3.org/TR/WebIDL/ + */ + +/* #include duk_internal.h -> already included */ + +/* + * Data structures for encoding/decoding + */ + +typedef struct { + duk_uint8_t *out; /* where to write next byte(s) */ + duk_codepoint_t lead; /* lead surrogate */ +} duk__encode_context; + +typedef struct { + /* UTF-8 decoding state */ + duk_codepoint_t codepoint; /* built up incrementally */ + duk_uint8_t upper; /* max value of next byte (decode error otherwise) */ + duk_uint8_t lower; /* min value of next byte (ditto) */ + duk_uint8_t needed; /* how many more bytes we need */ + duk_uint8_t bom_handled; /* BOM seen or no longer expected */ + + /* Decoder configuration */ + duk_uint8_t fatal; + duk_uint8_t ignore_bom; +} duk__decode_context; + +/* The signed duk_codepoint_t type is used to signal a decoded codepoint + * (>= 0) or various other states using negative values. + */ +#define DUK__CP_CONTINUE (-1) /* continue to next byte, no completed codepoint */ +#define DUK__CP_ERROR (-2) /* decoding error */ +#define DUK__CP_RETRY (-3) /* decoding error; retry last byte */ + +/* + * Raw helpers for encoding/decoding + */ + +/* Emit UTF-8 (= CESU-8) encoded U+FFFD (replacement char), i.e. ef bf bd. */ +DUK_LOCAL duk_uint8_t *duk__utf8_emit_repl(duk_uint8_t *ptr) { + *ptr++ = 0xef; + *ptr++ = 0xbf; + *ptr++ = 0xbd; + return ptr; +} + +DUK_LOCAL void duk__utf8_decode_init(duk__decode_context *dec_ctx) { + /* (Re)init the decoding state of 'dec_ctx' but leave decoder + * configuration fields untouched. + */ + dec_ctx->codepoint = 0x0000L; + dec_ctx->upper = 0xbf; + dec_ctx->lower = 0x80; + dec_ctx->needed = 0; + dec_ctx->bom_handled = 0; +} + +DUK_LOCAL duk_codepoint_t duk__utf8_decode_next(duk__decode_context *dec_ctx, duk_uint8_t x) { + /* + * UTF-8 algorithm based on the Encoding specification: + * https://encoding.spec.whatwg.org/#utf-8-decoder + * + * Two main states: decoding initial byte vs. decoding continuation + * bytes. Shortest length encoding is validated by restricting the + * allowed range of first continuation byte using 'lower' and 'upper'. + */ + + if (dec_ctx->needed == 0) { + /* process initial byte */ + if (x <= 0x7f) { + /* U+0000-U+007F, 1 byte (ASCII) */ + return (duk_codepoint_t) x; + } else if (x >= 0xc2 && x <= 0xdf) { + /* U+0080-U+07FF, 2 bytes */ + dec_ctx->needed = 1; + dec_ctx->codepoint = x & 0x1f; + DUK_ASSERT(dec_ctx->lower == 0x80); + DUK_ASSERT(dec_ctx->upper == 0xbf); + return DUK__CP_CONTINUE; + } else if (x >= 0xe0 && x <= 0xef) { + /* U+0800-U+FFFF, 3 bytes */ + if (x == 0xe0) { + dec_ctx->lower = 0xa0; + DUK_ASSERT(dec_ctx->upper == 0xbf); + } else if (x == 0xed) { + DUK_ASSERT(dec_ctx->lower == 0x80); + dec_ctx->upper = 0x9f; + } + dec_ctx->needed = 2; + dec_ctx->codepoint = x & 0x0f; + return DUK__CP_CONTINUE; + } else if (x >= 0xf0 && x <= 0xf4) { + /* U+010000-U+10FFFF, 4 bytes */ + if (x == 0xf0) { + dec_ctx->lower = 0x90; + DUK_ASSERT(dec_ctx->upper == 0xbf); + } else if (x == 0xf4) { + DUK_ASSERT(dec_ctx->lower == 0x80); + dec_ctx->upper = 0x8f; + } + dec_ctx->needed = 3; + dec_ctx->codepoint = x & 0x07; + return DUK__CP_CONTINUE; + } else { + /* not a legal initial byte */ + return DUK__CP_ERROR; + } + } else { + /* process continuation byte */ + if (x >= dec_ctx->lower && x <= dec_ctx->upper) { + dec_ctx->lower = 0x80; + dec_ctx->upper = 0xbf; + dec_ctx->codepoint = (dec_ctx->codepoint << 6) | (x & 0x3f); + if (--dec_ctx->needed > 0) { + /* need more bytes */ + return DUK__CP_CONTINUE; + } else { + /* got a codepoint */ + duk_codepoint_t ret; + DUK_ASSERT(dec_ctx->codepoint <= 0x10ffffL); /* Decoding rules guarantee. */ + ret = dec_ctx->codepoint; + dec_ctx->codepoint = 0x0000L; + dec_ctx->needed = 0; + return ret; + } + } else { + /* We just encountered an illegal UTF-8 continuation byte. This might + * be the initial byte of the next character; if we return a plain + * error status and the decoder is in replacement mode, the character + * will be masked. We still need to alert the caller to the error + * though. + */ + dec_ctx->codepoint = 0x0000L; + dec_ctx->needed = 0; + dec_ctx->lower = 0x80; + dec_ctx->upper = 0xbf; + return DUK__CP_RETRY; + } + } +} + +#if defined(DUK_USE_ENCODING_BUILTINS) +DUK_LOCAL void duk__utf8_encode_char(void *udata, duk_codepoint_t codepoint) { + duk__encode_context *enc_ctx; + + DUK_ASSERT(codepoint >= 0); + enc_ctx = (duk__encode_context *) udata; + DUK_ASSERT(enc_ctx != NULL); + +#if !defined(DUK_USE_PREFER_SIZE) + if (codepoint <= 0x7f && enc_ctx->lead == 0x0000L) { + /* Fast path for ASCII. */ + *enc_ctx->out++ = (duk_uint8_t) codepoint; + return; + } +#endif + + if (DUK_UNLIKELY(codepoint > 0x10ffffL)) { + /* cannot legally encode in UTF-8 */ + codepoint = DUK_UNICODE_CP_REPLACEMENT_CHARACTER; + } else if (codepoint >= 0xd800L && codepoint <= 0xdfffL) { + if (codepoint <= 0xdbffL) { + /* high surrogate */ + duk_codepoint_t prev_lead = enc_ctx->lead; + enc_ctx->lead = codepoint; + if (prev_lead == 0x0000L) { + /* high surrogate, no output */ + return; + } else { + /* consecutive high surrogates, consider first one unpaired */ + codepoint = DUK_UNICODE_CP_REPLACEMENT_CHARACTER; + } + } else { + /* low surrogate */ + if (enc_ctx->lead != 0x0000L) { + codepoint = (duk_codepoint_t) (0x010000L + ((enc_ctx->lead - 0xd800L) << 10) + (codepoint - 0xdc00L)); + enc_ctx->lead = 0x0000L; + } else { + /* unpaired low surrogate */ + DUK_ASSERT(enc_ctx->lead == 0x0000L); + codepoint = DUK_UNICODE_CP_REPLACEMENT_CHARACTER; + } + } + } else { + if (enc_ctx->lead != 0x0000L) { + /* unpaired high surrogate: emit replacement character and the input codepoint */ + enc_ctx->lead = 0x0000L; + enc_ctx->out = duk__utf8_emit_repl(enc_ctx->out); + } + } + + /* Codepoint may be original input, a decoded surrogate pair, or may + * have been replaced with U+FFFD. + */ + enc_ctx->out += duk_unicode_encode_xutf8((duk_ucodepoint_t) codepoint, enc_ctx->out); +} +#endif /* DUK_USE_ENCODING_BUILTINS */ + +/* Shared helper for buffer-to-string using a TextDecoder() compatible UTF-8 + * decoder. + */ +DUK_LOCAL duk_ret_t duk__decode_helper(duk_hthread *thr, duk__decode_context *dec_ctx) { + const duk_uint8_t *input; + duk_size_t len = 0; + duk_size_t len_tmp; + duk_bool_t stream = 0; + duk_codepoint_t codepoint; + duk_uint8_t *output; + const duk_uint8_t *in; + duk_uint8_t *out; + + DUK_ASSERT(dec_ctx != NULL); + + /* Careful with input buffer pointer: any side effects involving + * code execution (e.g. getters, coercion calls, and finalizers) + * may cause a resize and invalidate a pointer we've read. This + * is why the pointer is actually looked up at the last minute. + * Argument validation must still happen first to match WHATWG + * required side effect order. + */ + + if (duk_is_undefined(thr, 0)) { + duk_push_fixed_buffer_nozero(thr, 0); + duk_replace(thr, 0); + } + (void) duk_require_buffer_data(thr, 0, &len); /* Need 'len', avoid pointer. */ + + if (duk_check_type_mask(thr, 1, DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_NULL | + DUK_TYPE_MASK_NONE)) { + /* Use defaults, treat missing value like undefined. */ + } else { + duk_require_type_mask(thr, 1, DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_NULL | + DUK_TYPE_MASK_LIGHTFUNC | + DUK_TYPE_MASK_BUFFER | + DUK_TYPE_MASK_OBJECT); + if (duk_get_prop_literal(thr, 1, "stream")) { + stream = duk_to_boolean(thr, -1); + } + } + + /* Allowance is 3*len in the general case because all bytes may potentially + * become U+FFFD. If the first byte completes a non-BMP codepoint it will + * decode to a CESU-8 surrogate pair (6 bytes) so we allow 3 extra bytes to + * compensate: (1*3)+3 = 6. Non-BMP codepoints are safe otherwise because + * the 4->6 expansion is well under the 3x allowance. + * + * XXX: As with TextEncoder, need a better buffer allocation strategy here. + */ + if (len >= (DUK_HBUFFER_MAX_BYTELEN / 3) - 3) { + DUK_ERROR_TYPE(thr, DUK_STR_RESULT_TOO_LONG); + DUK_WO_NORETURN(return 0;); + } + output = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, 3 + (3 * len)); /* used parts will be always manually written over */ + + input = (const duk_uint8_t *) duk_get_buffer_data(thr, 0, &len_tmp); + DUK_ASSERT(input != NULL || len == 0); + if (DUK_UNLIKELY(len != len_tmp)) { + /* Very unlikely but possible: source buffer was resized by + * a side effect when fixed buffer was pushed. Output buffer + * may not be large enough to hold output, so just fail if + * length has changed. + */ + DUK_D(DUK_DPRINT("input buffer resized by side effect, fail")); + goto fail_type; + } + + /* From this point onwards it's critical that no side effect occur + * which may disturb 'input': finalizer execution, property accesses, + * active coercions, etc. Even an allocation related mark-and-sweep + * may affect the pointer because it may trigger a pending finalizer. + */ + + in = input; + out = output; + while (in < input + len) { + codepoint = duk__utf8_decode_next(dec_ctx, *in++); + if (codepoint < 0) { + if (codepoint == DUK__CP_CONTINUE) { + continue; + } + + /* Decoding error with or without retry. */ + DUK_ASSERT(codepoint == DUK__CP_ERROR || codepoint == DUK__CP_RETRY); + if (codepoint == DUK__CP_RETRY) { + --in; /* retry last byte */ + } + /* replacement mode: replace with U+FFFD */ + codepoint = DUK_UNICODE_CP_REPLACEMENT_CHARACTER; + if (dec_ctx->fatal) { + /* fatal mode: throw a TypeError */ + goto fail_type; + } + /* Continue with 'codepoint', Unicode replacement. */ + } + DUK_ASSERT(codepoint >= 0x0000L && codepoint <= 0x10ffffL); + + if (!dec_ctx->bom_handled) { + dec_ctx->bom_handled = 1; + if (codepoint == 0xfeffL && !dec_ctx->ignore_bom) { + continue; + } + } + + out += duk_unicode_encode_cesu8((duk_ucodepoint_t) codepoint, out); + DUK_ASSERT(out <= output + (3 + (3 * len))); + } + + if (!stream) { + if (dec_ctx->needed != 0) { + /* truncated sequence at end of buffer */ + if (dec_ctx->fatal) { + goto fail_type; + } else { + out += duk_unicode_encode_cesu8(DUK_UNICODE_CP_REPLACEMENT_CHARACTER, out); + DUK_ASSERT(out <= output + (3 + (3 * len))); + } + } + duk__utf8_decode_init(dec_ctx); /* Initialize decoding state for potential reuse. */ + } + + /* Output buffer is fixed and thus stable even if there had been + * side effects (which there shouldn't be). + */ + duk_push_lstring(thr, (const char *) output, (duk_size_t) (out - output)); + return 1; + + fail_type: + DUK_ERROR_TYPE(thr, DUK_STR_UTF8_DECODE_FAILED); + DUK_WO_NORETURN(return 0;); +} + +/* + * Built-in bindings + */ + +#if defined(DUK_USE_ENCODING_BUILTINS) +DUK_INTERNAL duk_ret_t duk_bi_textencoder_constructor(duk_hthread *thr) { + /* TextEncoder currently requires no persistent state, so the constructor + * does nothing on purpose. + */ + + duk_require_constructor_call(thr); + return 0; +} + +DUK_INTERNAL duk_ret_t duk_bi_textencoder_prototype_encoding_getter(duk_hthread *thr) { + duk_push_literal(thr, "utf-8"); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_textencoder_prototype_encode(duk_hthread *thr) { + duk__encode_context enc_ctx; + duk_size_t len; + duk_size_t final_len; + duk_uint8_t *output; + + DUK_ASSERT_TOP(thr, 1); + if (duk_is_undefined(thr, 0)) { + len = 0; + } else { + duk_hstring *h_input; + + h_input = duk_to_hstring(thr, 0); + DUK_ASSERT(h_input != NULL); + + len = (duk_size_t) DUK_HSTRING_GET_CHARLEN(h_input); + if (len >= DUK_HBUFFER_MAX_BYTELEN / 3) { + DUK_ERROR_TYPE(thr, DUK_STR_RESULT_TOO_LONG); + DUK_WO_NORETURN(return 0;); + } + } + + /* Allowance is 3*len because all bytes can potentially be replaced with + * U+FFFD -- which rather inconveniently encodes to 3 bytes in UTF-8. + * Rely on dynamic buffer data pointer stability: no other code has + * access to the data pointer. + * + * XXX: The buffer allocation strategy used here is rather inefficient. + * Maybe switch to a chunk-based strategy, or preprocess the string to + * figure out the space needed ahead of time? + */ + DUK_ASSERT(3 * len >= len); + output = (duk_uint8_t *) duk_push_dynamic_buffer(thr, 3 * len); + + if (len > 0) { + DUK_ASSERT(duk_is_string(thr, 0)); /* True if len > 0. */ + + /* XXX: duk_decode_string() is used to process the input + * string. For standard ECMAScript strings, represented + * internally as CESU-8, this is fine. However, behavior + * beyond CESU-8 is not very strict: codepoints using an + * extended form of UTF-8 are also accepted, and invalid + * codepoint sequences (which are allowed in Duktape strings) + * are not handled as well as they could (e.g. invalid + * continuation bytes may mask following codepoints). + * This is how ECMAScript code would also see such strings. + * Maybe replace duk_decode_string() with an explicit strict + * CESU-8 decoder here? + */ + enc_ctx.lead = 0x0000L; + enc_ctx.out = output; + duk_decode_string(thr, 0, duk__utf8_encode_char, (void *) &enc_ctx); + if (enc_ctx.lead != 0x0000L) { + /* unpaired high surrogate at end of string */ + enc_ctx.out = duk__utf8_emit_repl(enc_ctx.out); + DUK_ASSERT(enc_ctx.out <= output + (3 * len)); + } + + /* The output buffer is usually very much oversized, so shrink it to + * actually needed size. Pointer stability assumed up to this point. + */ + DUK_ASSERT_TOP(thr, 2); + DUK_ASSERT(output == (duk_uint8_t *) duk_get_buffer_data(thr, -1, NULL)); + + final_len = (duk_size_t) (enc_ctx.out - output); + duk_resize_buffer(thr, -1, final_len); + /* 'output' and 'enc_ctx.out' are potentially invalidated by the resize. */ + } else { + final_len = 0; + } + + /* Standard WHATWG output is a Uint8Array. Here the Uint8Array will + * be backed by a dynamic buffer which differs from e.g. Uint8Arrays + * created as 'new Uint8Array(N)'. ECMAScript code won't see the + * difference but C code will. When bufferobjects are not supported, + * returns a plain dynamic buffer. + */ +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + duk_push_buffer_object(thr, -1, 0, final_len, DUK_BUFOBJ_UINT8ARRAY); +#endif + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_textdecoder_constructor(duk_hthread *thr) { + duk__decode_context *dec_ctx; + duk_bool_t fatal = 0; + duk_bool_t ignore_bom = 0; + + DUK_ASSERT_TOP(thr, 2); + duk_require_constructor_call(thr); + if (!duk_is_undefined(thr, 0)) { + /* XXX: For now ignore 'label' (encoding identifier). */ + duk_to_string(thr, 0); + } + if (!duk_is_null_or_undefined(thr, 1)) { + if (duk_get_prop_literal(thr, 1, "fatal")) { + fatal = duk_to_boolean(thr, -1); + } + if (duk_get_prop_literal(thr, 1, "ignoreBOM")) { + ignore_bom = duk_to_boolean(thr, -1); + } + } + + duk_push_this(thr); + + /* The decode context is not assumed to be zeroed; all fields are + * initialized explicitly. + */ + dec_ctx = (duk__decode_context *) duk_push_fixed_buffer(thr, sizeof(duk__decode_context)); + dec_ctx->fatal = (duk_uint8_t) fatal; + dec_ctx->ignore_bom = (duk_uint8_t) ignore_bom; + duk__utf8_decode_init(dec_ctx); /* Initializes remaining fields. */ + + duk_put_prop_literal(thr, -2, DUK_INTERNAL_SYMBOL("Context")); + return 0; +} + +/* Get TextDecoder context from 'this'; leaves garbage on stack. */ +DUK_LOCAL duk__decode_context *duk__get_textdecoder_context(duk_hthread *thr) { + duk__decode_context *dec_ctx; + duk_push_this(thr); + duk_get_prop_literal(thr, -1, DUK_INTERNAL_SYMBOL("Context")); + dec_ctx = (duk__decode_context *) duk_require_buffer(thr, -1, NULL); + DUK_ASSERT(dec_ctx != NULL); + return dec_ctx; +} + +DUK_INTERNAL duk_ret_t duk_bi_textdecoder_prototype_shared_getter(duk_hthread *thr) { + duk__decode_context *dec_ctx; + duk_int_t magic; + + dec_ctx = duk__get_textdecoder_context(thr); + magic = duk_get_current_magic(thr); + switch (magic) { + case 0: + /* Encoding is now fixed, so _Context lookup is only needed to + * validate the 'this' binding (TypeError if not TextDecoder-like). + */ + duk_push_literal(thr, "utf-8"); + break; + case 1: + duk_push_boolean(thr, dec_ctx->fatal); + break; + default: + duk_push_boolean(thr, dec_ctx->ignore_bom); + break; + } + + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_textdecoder_prototype_decode(duk_hthread *thr) { + duk__decode_context *dec_ctx; + + dec_ctx = duk__get_textdecoder_context(thr); + return duk__decode_helper(thr, dec_ctx); +} +#endif /* DUK_USE_ENCODING_BUILTINS */ + +/* + * Internal helper for Node.js Buffer + */ + +/* Internal helper used for Node.js Buffer .toString(). Value stack convention + * is currently odd: it mimics TextDecoder .decode() so that argument must be at + * index 0, and decode options (not present for Buffer) at index 1. Return value + * is a Duktape/C function return value. + */ +DUK_INTERNAL duk_ret_t duk_textdecoder_decode_utf8_nodejs(duk_hthread *thr) { + duk__decode_context dec_ctx; + + dec_ctx.fatal = 0; /* use replacement chars */ + dec_ctx.ignore_bom = 1; /* ignore BOMs (matches Node.js Buffer .toString()) */ + duk__utf8_decode_init(&dec_ctx); + + return duk__decode_helper(thr, &dec_ctx); +} + +/* automatic undefs */ +#undef DUK__CP_CONTINUE +#undef DUK__CP_ERROR +#undef DUK__CP_RETRY +#line 1 "duk_bi_error.c" +/* + * Error built-ins + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL duk_ret_t duk_bi_error_constructor_shared(duk_hthread *thr) { + /* Behavior for constructor and non-constructor call is + * the same except for augmenting the created error. When + * called as a constructor, the caller (duk_new()) will handle + * augmentation; when called as normal function, we need to do + * it here. + */ + + duk_small_int_t bidx_prototype = duk_get_current_magic(thr); + + /* same for both error and each subclass like TypeError */ + duk_uint_t flags_and_class = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ERROR); + + (void) duk_push_object_helper(thr, flags_and_class, bidx_prototype); + + /* If message is undefined, the own property 'message' is not set at + * all to save property space. An empty message is inherited anyway. + */ + if (!duk_is_undefined(thr, 0)) { + duk_to_string(thr, 0); + duk_dup_0(thr); /* [ message error message ] */ + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_MESSAGE, DUK_PROPDESC_FLAGS_WC); + } + + /* Augment the error if called as a normal function. __FILE__ and __LINE__ + * are not desirable in this case. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) + if (!duk_is_constructor_call(thr)) { + duk_err_augment_error_create(thr, thr, NULL, 0, DUK_AUGMENT_FLAG_NOBLAME_FILELINE); + } +#endif + + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_to_string(duk_hthread *thr) { + /* XXX: optimize with more direct internal access */ + + duk_push_this(thr); + (void) duk_require_hobject_promote_mask(thr, -1, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + + /* [ ... this ] */ + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_NAME); + if (duk_is_undefined(thr, -1)) { + duk_pop(thr); + duk_push_literal(thr, "Error"); + } else { + duk_to_string(thr, -1); + } + + /* [ ... this name ] */ + + /* XXX: Are steps 6 and 7 in E5 Section 15.11.4.4 duplicated by + * accident or are they actually needed? The first ToString() + * could conceivably return 'undefined'. + */ + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_MESSAGE); + if (duk_is_undefined(thr, -1)) { + duk_pop(thr); + duk_push_hstring_empty(thr); + } else { + duk_to_string(thr, -1); + } + + /* [ ... this name message ] */ + + if (duk_get_length(thr, -2) == 0) { + /* name is empty -> return message */ + return 1; + } + if (duk_get_length(thr, -1) == 0) { + /* message is empty -> return name */ + duk_pop(thr); + return 1; + } + duk_push_literal(thr, ": "); + duk_insert(thr, -2); /* ... name ': ' message */ + duk_concat(thr, 3); + + return 1; +} + +#if defined(DUK_USE_TRACEBACKS) + +/* + * Traceback handling + * + * The unified helper decodes the traceback and produces various requested + * outputs. It should be optimized for size, and may leave garbage on stack, + * only the topmost return value matters. For instance, traceback separator + * and decoded strings are pushed even when looking for filename only. + * + * NOTE: although _Tracedata is an internal property, user code can currently + * write to the array (or replace it with something other than an array). + * The code below must tolerate arbitrary _Tracedata. It can throw errors + * etc, but cannot cause a segfault or memory unsafe behavior. + */ + +/* constants arbitrary, chosen for small loads */ +#define DUK__OUTPUT_TYPE_TRACEBACK (-1) +#define DUK__OUTPUT_TYPE_FILENAME 0 +#define DUK__OUTPUT_TYPE_LINENUMBER 1 + +DUK_LOCAL duk_ret_t duk__error_getter_helper(duk_hthread *thr, duk_small_int_t output_type) { + duk_idx_t idx_td; + duk_small_int_t i; /* traceback depth fits into 16 bits */ + duk_small_int_t t; /* stack type fits into 16 bits */ + duk_small_int_t count_func = 0; /* traceback depth ensures fits into 16 bits */ + const char *str_tailcall = " tailcall"; + const char *str_strict = " strict"; + const char *str_construct = " construct"; + const char *str_prevyield = " preventsyield"; + const char *str_directeval = " directeval"; + const char *str_empty = ""; + + DUK_ASSERT_TOP(thr, 0); /* fixed arg count */ + + duk_push_this(thr); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_TRACEDATA); + idx_td = duk_get_top_index(thr); + + duk_push_hstring_stridx(thr, DUK_STRIDX_NEWLINE_4SPACE); + duk_push_this(thr); + + /* [ ... this tracedata sep this ] */ + + /* XXX: skip null filename? */ + + if (duk_check_type(thr, idx_td, DUK_TYPE_OBJECT)) { + /* Current tracedata contains 2 entries per callstack entry. */ + for (i = 0; ; i += 2) { + duk_int_t pc; + duk_uint_t line; + duk_uint_t flags; + duk_double_t d; + const char *funcname; + const char *filename; + duk_hobject *h_func; + duk_hstring *h_name; + + duk_require_stack(thr, 5); + duk_get_prop_index(thr, idx_td, (duk_uarridx_t) i); + duk_get_prop_index(thr, idx_td, (duk_uarridx_t) (i + 1)); + d = duk_to_number_m1(thr); + pc = duk_double_to_int_t(DUK_FMOD(d, DUK_DOUBLE_2TO32)); + flags = duk_double_to_uint_t(DUK_FLOOR(d / DUK_DOUBLE_2TO32)); + t = (duk_small_int_t) duk_get_type(thr, -2); + + if (t == DUK_TYPE_OBJECT || t == DUK_TYPE_LIGHTFUNC) { + /* + * ECMAScript/native function call or lightfunc call + */ + + count_func++; + + /* [ ... v1(func) v2(pc+flags) ] */ + + /* These may be systematically omitted by Duktape + * with certain config options, but allow user to + * set them on a case-by-case basis. + */ + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_NAME); + duk_get_prop_stridx_short(thr, -3, DUK_STRIDX_FILE_NAME); + +#if defined(DUK_USE_PC2LINE) + line = (duk_uint_t) duk_hobject_pc2line_query(thr, -4, (duk_uint_fast32_t) pc); +#else + line = 0; +#endif + + /* [ ... v1 v2 name filename ] */ + + /* When looking for .fileName/.lineNumber, blame first + * function which has a .fileName. + */ + if (duk_is_string_notsymbol(thr, -1)) { + if (output_type == DUK__OUTPUT_TYPE_FILENAME) { + return 1; + } else if (output_type == DUK__OUTPUT_TYPE_LINENUMBER) { + duk_push_uint(thr, line); + return 1; + } + } + + /* XXX: Change 'anon' handling here too, to use empty string for anonymous functions? */ + /* XXX: Could be improved by coercing to a readable duk_tval (especially string escaping) */ + h_name = duk_get_hstring_notsymbol(thr, -2); /* may be NULL */ + funcname = (h_name == NULL || h_name == DUK_HTHREAD_STRING_EMPTY_STRING(thr)) ? + "[anon]" : (const char *) DUK_HSTRING_GET_DATA(h_name); + filename = duk_get_string_notsymbol(thr, -1); + filename = filename ? filename : ""; + DUK_ASSERT(funcname != NULL); + DUK_ASSERT(filename != NULL); + + h_func = duk_get_hobject(thr, -4); /* NULL for lightfunc */ + + if (h_func == NULL) { + duk_push_sprintf(thr, "at %s light%s%s%s%s%s", + (const char *) funcname, + (const char *) ((flags & DUK_ACT_FLAG_STRICT) ? str_strict : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_TAILCALLED) ? str_tailcall : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_CONSTRUCT) ? str_construct : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_DIRECT_EVAL) ? str_directeval : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_PREVENT_YIELD) ? str_prevyield : str_empty)); + } else if (DUK_HOBJECT_HAS_NATFUNC(h_func)) { + duk_push_sprintf(thr, "at %s (%s) native%s%s%s%s%s", + (const char *) funcname, + (const char *) filename, + (const char *) ((flags & DUK_ACT_FLAG_STRICT) ? str_strict : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_TAILCALLED) ? str_tailcall : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_CONSTRUCT) ? str_construct : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_DIRECT_EVAL) ? str_directeval : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_PREVENT_YIELD) ? str_prevyield : str_empty)); + } else { + duk_push_sprintf(thr, "at %s (%s:%lu)%s%s%s%s%s", + (const char *) funcname, + (const char *) filename, + (unsigned long) line, + (const char *) ((flags & DUK_ACT_FLAG_STRICT) ? str_strict : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_TAILCALLED) ? str_tailcall : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_CONSTRUCT) ? str_construct : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_DIRECT_EVAL) ? str_directeval : str_empty), + (const char *) ((flags & DUK_ACT_FLAG_PREVENT_YIELD) ? str_prevyield : str_empty)); + } + duk_replace(thr, -5); /* [ ... v1 v2 name filename str ] -> [ ... str v2 name filename ] */ + duk_pop_3(thr); /* -> [ ... str ] */ + } else if (t == DUK_TYPE_STRING) { + const char *str_file; + + /* + * __FILE__ / __LINE__ entry, here 'pc' is line number directly. + * Sometimes __FILE__ / __LINE__ is reported as the source for + * the error (fileName, lineNumber), sometimes not. + */ + + /* [ ... v1(filename) v2(line+flags) ] */ + + /* When looking for .fileName/.lineNumber, blame compilation + * or C call site unless flagged not to do so. + */ + if (!(flags & DUK_TB_FLAG_NOBLAME_FILELINE)) { + if (output_type == DUK__OUTPUT_TYPE_FILENAME) { + duk_pop(thr); + return 1; + } else if (output_type == DUK__OUTPUT_TYPE_LINENUMBER) { + duk_push_int(thr, pc); + return 1; + } + } + + /* Tracedata is trusted but avoid any risk of using a NULL + * for %s format because it has undefined behavior. Symbols + * don't need to be explicitly rejected as they pose no memory + * safety issues. + */ + str_file = (const char *) duk_get_string(thr, -2); + duk_push_sprintf(thr, "at [anon] (%s:%ld) internal", + (const char *) (str_file ? str_file : "null"), (long) pc); + duk_replace(thr, -3); /* [ ... v1 v2 str ] -> [ ... str v2 ] */ + duk_pop(thr); /* -> [ ... str ] */ + } else { + /* unknown, ignore */ + duk_pop_2(thr); + break; + } + } + + if (count_func >= DUK_USE_TRACEBACK_DEPTH) { + /* Possibly truncated; there is no explicit truncation + * marker so this is the best we can do. + */ + + duk_push_hstring_stridx(thr, DUK_STRIDX_BRACKETED_ELLIPSIS); + } + } + + /* [ ... this tracedata sep this str1 ... strN ] */ + + if (output_type != DUK__OUTPUT_TYPE_TRACEBACK) { + return 0; + } else { + /* The 'this' after 'sep' will get ToString() coerced by + * duk_join() automatically. We don't want to do that + * coercion when providing .fileName or .lineNumber (GH-254). + */ + duk_join(thr, duk_get_top(thr) - (idx_td + 2) /*count, not including sep*/); + return 1; + } +} + +/* XXX: Output type could be encoded into native function 'magic' value to + * save space. For setters the stridx could be encoded into 'magic'. + */ + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_stack_getter(duk_hthread *thr) { + return duk__error_getter_helper(thr, DUK__OUTPUT_TYPE_TRACEBACK); +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_filename_getter(duk_hthread *thr) { + return duk__error_getter_helper(thr, DUK__OUTPUT_TYPE_FILENAME); +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_linenumber_getter(duk_hthread *thr) { + return duk__error_getter_helper(thr, DUK__OUTPUT_TYPE_LINENUMBER); +} + +#else /* DUK_USE_TRACEBACKS */ + +/* + * Traceback handling when tracebacks disabled. + * + * The fileName / lineNumber stubs are now necessary because built-in + * data will include the accessor properties in Error.prototype. If those + * are removed for builds without tracebacks, these can also be removed. + * 'stack' should still be present and produce a ToString() equivalent: + * this is useful for user code which prints a stacktrace and expects to + * see something useful. A normal stacktrace also begins with a ToString() + * of the error so this makes sense. + */ + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_stack_getter(duk_hthread *thr) { + /* XXX: remove this native function and map 'stack' accessor + * to the toString() implementation directly. + */ + return duk_bi_error_prototype_to_string(thr); +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_filename_getter(duk_hthread *thr) { + DUK_UNREF(thr); + return 0; +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_linenumber_getter(duk_hthread *thr) { + DUK_UNREF(thr); + return 0; +} + +#endif /* DUK_USE_TRACEBACKS */ + +DUK_LOCAL duk_ret_t duk__error_setter_helper(duk_hthread *thr, duk_small_uint_t stridx_key) { + /* Attempt to write 'stack', 'fileName', 'lineNumber' works as if + * user code called Object.defineProperty() to create an overriding + * own property. This allows user code to overwrite .fileName etc + * intuitively as e.g. "err.fileName = 'dummy'" as one might expect. + * See https://github.com/svaarala/duktape/issues/387. + */ + + DUK_ASSERT_TOP(thr, 1); /* fixed arg count: value */ + + duk_push_this(thr); + duk_push_hstring_stridx(thr, stridx_key); + duk_dup_0(thr); + + /* [ ... obj key value ] */ + + DUK_DD(DUK_DDPRINT("error setter: %!T %!T %!T", + duk_get_tval(thr, -3), duk_get_tval(thr, -2), duk_get_tval(thr, -1))); + + duk_def_prop(thr, -3, DUK_DEFPROP_HAVE_VALUE | + DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_WRITABLE | + DUK_DEFPROP_HAVE_ENUMERABLE | /*not enumerable*/ + DUK_DEFPROP_HAVE_CONFIGURABLE | DUK_DEFPROP_CONFIGURABLE); + return 0; +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_stack_setter(duk_hthread *thr) { + return duk__error_setter_helper(thr, DUK_STRIDX_STACK); +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_filename_setter(duk_hthread *thr) { + return duk__error_setter_helper(thr, DUK_STRIDX_FILE_NAME); +} + +DUK_INTERNAL duk_ret_t duk_bi_error_prototype_linenumber_setter(duk_hthread *thr) { + return duk__error_setter_helper(thr, DUK_STRIDX_LINE_NUMBER); +} + +/* automatic undefs */ +#undef DUK__OUTPUT_TYPE_FILENAME +#undef DUK__OUTPUT_TYPE_LINENUMBER +#undef DUK__OUTPUT_TYPE_TRACEBACK +#line 1 "duk_bi_function.c" +/* + * Function built-ins + */ + +/* #include duk_internal.h -> already included */ + +/* Needed even when Function built-in is disabled. */ +DUK_INTERNAL duk_ret_t duk_bi_function_prototype(duk_hthread *thr) { + /* ignore arguments, return undefined (E5 Section 15.3.4) */ + DUK_UNREF(thr); + return 0; +} + +#if defined(DUK_USE_FUNCTION_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_function_constructor(duk_hthread *thr) { + duk_hstring *h_sourcecode; + duk_idx_t nargs; + duk_idx_t i; + duk_small_uint_t comp_flags; + duk_hcompfunc *func; + duk_hobject *outer_lex_env; + duk_hobject *outer_var_env; + + /* normal and constructor calls have identical semantics */ + + nargs = duk_get_top(thr); + for (i = 0; i < nargs; i++) { + duk_to_string(thr, i); /* Rejects Symbols during coercion. */ + } + + if (nargs == 0) { + duk_push_hstring_empty(thr); + duk_push_hstring_empty(thr); + } else if (nargs == 1) { + /* XXX: cover this with the generic >1 case? */ + duk_push_hstring_empty(thr); + } else { + duk_insert(thr, 0); /* [ arg1 ... argN-1 body] -> [body arg1 ... argN-1] */ + duk_push_literal(thr, ","); + duk_insert(thr, 1); + duk_join(thr, nargs - 1); + } + + /* [ body formals ], formals is comma separated list that needs to be parsed */ + + DUK_ASSERT_TOP(thr, 2); + + /* XXX: this placeholder is not always correct, but use for now. + * It will fail in corner cases; see test-dev-func-cons-args.js. + */ + duk_push_literal(thr, "function("); + duk_dup_1(thr); + duk_push_literal(thr, "){"); + duk_dup_0(thr); + duk_push_literal(thr, "\n}"); /* Newline is important to handle trailing // comment. */ + duk_concat(thr, 5); + + /* [ body formals source ] */ + + DUK_ASSERT_TOP(thr, 3); + + /* strictness is not inherited, intentional */ + comp_flags = DUK_COMPILE_FUNCEXPR; + + duk_push_hstring_stridx(thr, DUK_STRIDX_COMPILE); /* XXX: copy from caller? */ /* XXX: ignored now */ + h_sourcecode = duk_require_hstring(thr, -2); /* no symbol check needed; -2 is concat'd code */ + duk_js_compile(thr, + (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_sourcecode), + (duk_size_t) DUK_HSTRING_GET_BYTELEN(h_sourcecode), + comp_flags); + + /* Force .name to 'anonymous' (ES2015). */ + duk_push_literal(thr, "anonymous"); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C); + + func = (duk_hcompfunc *) duk_known_hobject(thr, -1); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) func)); + DUK_ASSERT(DUK_HOBJECT_HAS_CONSTRUCTABLE((duk_hobject *) func)); + + /* [ body formals source template ] */ + + /* only outer_lex_env matters, as functions always get a new + * variable declaration environment. + */ + + outer_lex_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + outer_var_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + + duk_js_push_closure(thr, func, outer_var_env, outer_lex_env, 1 /*add_auto_proto*/); + + /* [ body formals source template closure ] */ + + return 1; +} +#endif /* DUK_USE_FUNCTION_BUILTIN */ + +#if defined(DUK_USE_FUNCTION_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_function_prototype_to_string(duk_hthread *thr) { + duk_tval *tv; + + /* + * E5 Section 15.3.4.2 places few requirements on the output of + * this function: the result is implementation dependent, must + * follow FunctionDeclaration syntax (in particular, must have a + * name even for anonymous functions or functions with empty name). + * The output does NOT need to compile into anything useful. + * + * E6 Section 19.2.3.5 changes the requirements completely: the + * result must either eval() to a functionally equivalent object + * OR eval() to a SyntaxError. + * + * We opt for the SyntaxError approach for now, with a syntax that + * mimics V8's native function syntax: + * + * 'function cos() { [native code] }' + * + * but extended with [ecmascript code], [bound code], and + * [lightfunc code]. + */ + + duk_push_this(thr); + tv = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *obj = DUK_TVAL_GET_OBJECT(tv); + const char *func_name; + + /* Function name: missing/undefined is mapped to empty string, + * otherwise coerce to string. No handling for invalid identifier + * characters or e.g. '{' in the function name. This doesn't + * really matter as long as a SyntaxError results. Technically + * if the name contained a suitable prefix followed by '//' it + * might cause the result to parse without error. + */ + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_NAME); + if (duk_is_undefined(thr, -1)) { + func_name = ""; + } else { + func_name = duk_to_string(thr, -1); + DUK_ASSERT(func_name != NULL); + } + + if (DUK_HOBJECT_IS_COMPFUNC(obj)) { + duk_push_sprintf(thr, "function %s() { [ecmascript code] }", (const char *) func_name); + } else if (DUK_HOBJECT_IS_NATFUNC(obj)) { + duk_push_sprintf(thr, "function %s() { [native code] }", (const char *) func_name); + } else if (DUK_HOBJECT_IS_BOUNDFUNC(obj)) { + duk_push_sprintf(thr, "function %s() { [bound code] }", (const char *) func_name); + } else { + goto type_error; + } + } else if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + duk_push_lightfunc_tostring(thr, tv); + } else { + goto type_error; + } + + return 1; + + type_error: + DUK_DCERROR_TYPE_INVALID_ARGS(thr); +} +#endif + +/* Always present because the native function pointer is needed in call + * handling. + */ +DUK_INTERNAL duk_ret_t duk_bi_function_prototype_call(duk_hthread *thr) { + /* .call() is dealt with in call handling by simulating its + * effects so this function is actually never called. + */ + DUK_UNREF(thr); + return DUK_RET_TYPE_ERROR; +} + +DUK_INTERNAL duk_ret_t duk_bi_function_prototype_apply(duk_hthread *thr) { + /* Like .call(), never actually called. */ + DUK_UNREF(thr); + return DUK_RET_TYPE_ERROR; +} + +DUK_INTERNAL duk_ret_t duk_bi_reflect_apply(duk_hthread *thr) { + /* Like .call(), never actually called. */ + DUK_UNREF(thr); + return DUK_RET_TYPE_ERROR; +} + +DUK_INTERNAL duk_ret_t duk_bi_reflect_construct(duk_hthread *thr) { + /* Like .call(), never actually called. */ + DUK_UNREF(thr); + return DUK_RET_TYPE_ERROR; +} + +#if defined(DUK_USE_FUNCTION_BUILTIN) +/* Create a bound function which points to a target function which may + * be bound or non-bound. If the target is bound, the argument lists + * and 'this' binding of the functions are merged and the resulting + * function points directly to the non-bound target. + */ +DUK_INTERNAL duk_ret_t duk_bi_function_prototype_bind(duk_hthread *thr) { + duk_hboundfunc *h_bound; + duk_idx_t nargs; /* bound args, not counting 'this' binding */ + duk_idx_t bound_nargs; + duk_int_t bound_len; + duk_tval *tv_prevbound; + duk_idx_t n_prevbound; + duk_tval *tv_res; + duk_tval *tv_tmp; + + /* XXX: C API call, e.g. duk_push_bound_function(thr, target_idx, nargs); */ + + /* Vararg function, careful arg handling, e.g. thisArg may not + * be present. + */ + nargs = duk_get_top(thr) - 1; /* actual args, not counting 'this' binding */ + if (nargs < 0) { + nargs++; + duk_push_undefined(thr); + } + DUK_ASSERT(nargs >= 0); + + /* Limit 'nargs' for bound functions to guarantee arithmetic + * below will never wrap. + */ + if (nargs > (duk_idx_t) DUK_HBOUNDFUNC_MAX_ARGS) { + DUK_DCERROR_RANGE_INVALID_COUNT(thr); + } + + duk_push_this(thr); + duk_require_callable(thr, -1); + + /* [ thisArg arg1 ... argN func ] (thisArg+args == nargs+1 total) */ + DUK_ASSERT_TOP(thr, nargs + 2); + + /* Create bound function object. */ + h_bound = duk_push_hboundfunc(thr); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&h_bound->target)); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&h_bound->this_binding)); + DUK_ASSERT(h_bound->args == NULL); + DUK_ASSERT(h_bound->nargs == 0); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_bound) == NULL); + + /* [ thisArg arg1 ... argN func boundFunc ] */ + + /* If the target is a bound function, argument lists must be + * merged. The 'this' binding closest to the target function + * wins because in call handling the 'this' gets replaced over + * and over again until we call the non-bound function. + */ + tv_prevbound = NULL; + n_prevbound = 0; + tv_tmp = DUK_GET_TVAL_POSIDX(thr, 0); + DUK_TVAL_SET_TVAL(&h_bound->this_binding, tv_tmp); + tv_tmp = DUK_GET_TVAL_NEGIDX(thr, -2); + DUK_TVAL_SET_TVAL(&h_bound->target, tv_tmp); + + if (DUK_TVAL_IS_OBJECT(tv_tmp)) { + duk_hobject *h_target; + duk_hobject *bound_proto; + + h_target = DUK_TVAL_GET_OBJECT(tv_tmp); + DUK_ASSERT(DUK_HOBJECT_IS_CALLABLE(h_target)); + + /* Internal prototype must be copied from the target. + * For lightfuncs Function.prototype is used and is already + * in place. + */ + bound_proto = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_target); + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) h_bound, bound_proto); + + /* The 'strict' flag is copied to get the special [[Get]] of E5.1 + * Section 15.3.5.4 to apply when a 'caller' value is a strict bound + * function. Not sure if this is correct, because the specification + * is a bit ambiguous on this point but it would make sense. + */ + /* Strictness is inherited from target. */ + if (DUK_HOBJECT_HAS_STRICT(h_target)) { + DUK_HOBJECT_SET_STRICT((duk_hobject *) h_bound); + } + + if (DUK_HOBJECT_HAS_BOUNDFUNC(h_target)) { + duk_hboundfunc *h_boundtarget; + + h_boundtarget = (duk_hboundfunc *) (void *) h_target; + + /* The final function should always be non-bound, unless + * there's a bug in the internals. Assert for it. + */ + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(&h_boundtarget->target) || + (DUK_TVAL_IS_OBJECT(&h_boundtarget->target) && + DUK_HOBJECT_IS_CALLABLE(DUK_TVAL_GET_OBJECT(&h_boundtarget->target)) && + !DUK_HOBJECT_IS_BOUNDFUNC(DUK_TVAL_GET_OBJECT(&h_boundtarget->target)))); + + DUK_TVAL_SET_TVAL(&h_bound->target, &h_boundtarget->target); + DUK_TVAL_SET_TVAL(&h_bound->this_binding, &h_boundtarget->this_binding); + + tv_prevbound = h_boundtarget->args; + n_prevbound = h_boundtarget->nargs; + } + } else { + /* Lightfuncs are always strict. */ + duk_hobject *bound_proto; + + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv_tmp)); + DUK_HOBJECT_SET_STRICT((duk_hobject *) h_bound); + bound_proto = thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]; + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) h_bound, bound_proto); + } + + DUK_TVAL_INCREF(thr, &h_bound->target); /* old values undefined, no decref needed */ + DUK_TVAL_INCREF(thr, &h_bound->this_binding); + + bound_nargs = n_prevbound + nargs; + if (bound_nargs > (duk_idx_t) DUK_HBOUNDFUNC_MAX_ARGS) { + DUK_DCERROR_RANGE_INVALID_COUNT(thr); + } + tv_res = (duk_tval *) DUK_ALLOC_CHECKED(thr, ((duk_size_t) bound_nargs) * sizeof(duk_tval)); + DUK_ASSERT(tv_res != NULL || bound_nargs == 0); + DUK_ASSERT(h_bound->args == NULL); + DUK_ASSERT(h_bound->nargs == 0); + h_bound->args = tv_res; + h_bound->nargs = bound_nargs; + + DUK_ASSERT(n_prevbound >= 0); + duk_copy_tvals_incref(thr, tv_res, tv_prevbound, (duk_size_t) n_prevbound); + DUK_ASSERT(nargs >= 0); + duk_copy_tvals_incref(thr, tv_res + n_prevbound, DUK_GET_TVAL_POSIDX(thr, 1), (duk_size_t) nargs); + + /* [ thisArg arg1 ... argN func boundFunc ] */ + + /* Bound function 'length' property is interesting. + * For lightfuncs, simply read the virtual property. + */ + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH); + bound_len = duk_get_int(thr, -1); /* ES2015: no coercion */ + if (bound_len < nargs) { + bound_len = 0; + } else { + bound_len -= nargs; + } + if (sizeof(duk_int_t) > 4 && bound_len > (duk_int_t) DUK_UINT32_MAX) { + bound_len = (duk_int_t) DUK_UINT32_MAX; + } + duk_pop(thr); + DUK_ASSERT(bound_len >= 0); + tv_tmp = thr->valstack_top++; + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv_tmp)); + DUK_ASSERT(!DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv_tmp)); + DUK_TVAL_SET_U32(tv_tmp, (duk_uint32_t) bound_len); /* in-place update, fastint */ + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_C); /* attrs in E6 Section 9.2.4 */ + + /* XXX: could these be virtual? */ + /* Caller and arguments must use the same thrower, [[ThrowTypeError]]. */ + duk_xdef_prop_stridx_thrower(thr, -1, DUK_STRIDX_CALLER); + duk_xdef_prop_stridx_thrower(thr, -1, DUK_STRIDX_LC_ARGUMENTS); + + /* Function name and fileName (non-standard). */ + duk_push_literal(thr, "bound "); /* ES2015 19.2.3.2. */ + duk_get_prop_stridx(thr, -3, DUK_STRIDX_NAME); + if (!duk_is_string_notsymbol(thr, -1)) { + /* ES2015 has requirement to check that .name of target is a string + * (also must check for Symbol); if not, targetName should be the + * empty string. ES2015 19.2.3.2. + */ + duk_pop(thr); + duk_push_hstring_empty(thr); + } + duk_concat(thr, 2); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C); +#if defined(DUK_USE_FUNC_FILENAME_PROPERTY) + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_FILE_NAME); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_FILE_NAME, DUK_PROPDESC_FLAGS_C); +#endif + + DUK_DDD(DUK_DDDPRINT("created bound function: %!iT", (duk_tval *) duk_get_tval(thr, -1))); + + return 1; +} +#endif /* DUK_USE_FUNCTION_BUILTIN */ + +/* %NativeFunctionPrototype% .length getter. */ +DUK_INTERNAL duk_ret_t duk_bi_native_function_length(duk_hthread *thr) { + duk_tval *tv; + duk_hnatfunc *h; + duk_int16_t func_nargs; + + tv = duk_get_borrowed_this_tval(thr); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_OBJECT(tv)) { + h = (duk_hnatfunc *) DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (!DUK_HOBJECT_IS_NATFUNC((duk_hobject *) h)) { + goto fail_type; + } + func_nargs = h->nargs; + duk_push_int(thr, func_nargs == DUK_HNATFUNC_NARGS_VARARGS ? 0 : func_nargs); + } else if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + duk_small_uint_t lf_flags; + duk_small_uint_t lf_len; + + lf_flags = DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv); + lf_len = DUK_LFUNC_FLAGS_GET_LENGTH(lf_flags); + duk_push_uint(thr, lf_len); + } else { + goto fail_type; + } + return 1; + + fail_type: + DUK_DCERROR_TYPE_INVALID_ARGS(thr); +} + +/* %NativeFunctionPrototype% .name getter. */ +DUK_INTERNAL duk_ret_t duk_bi_native_function_name(duk_hthread *thr) { + duk_tval *tv; + duk_hnatfunc *h; + + tv = duk_get_borrowed_this_tval(thr); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_OBJECT(tv)) { + h = (duk_hnatfunc *) DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + if (!DUK_HOBJECT_IS_NATFUNC((duk_hobject *) h)) { + goto fail_type; + } +#if 0 + duk_push_hnatfunc_name(thr, h); +#endif + duk_push_hstring_empty(thr); + } else if (DUK_TVAL_IS_LIGHTFUNC(tv)) { + duk_push_lightfunc_name(thr, tv); + } else { + goto fail_type; + } + return 1; + + fail_type: + DUK_DCERROR_TYPE_INVALID_ARGS(thr); +} + +#if defined(DUK_USE_SYMBOL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_function_prototype_hasinstance(duk_hthread *thr) { + /* This binding: RHS, stack index 0: LHS. */ + duk_bool_t ret; + + ret = duk_js_instanceof_ordinary(thr, DUK_GET_TVAL_POSIDX(thr, 0), DUK_GET_THIS_TVAL_PTR(thr)); + duk_push_boolean(thr, ret); + return 1; +} +#endif /* DUK_USE_SYMBOL_BUILTIN */ +#line 1 "duk_bi_global.c" +/* + * Global object built-ins + */ + +/* #include duk_internal.h -> already included */ + +/* + * Encoding/decoding helpers + */ + +/* XXX: Could add fast path (for each transform callback) with direct byte + * lookups (no shifting) and no explicit check for x < 0x80 before table + * lookup. + */ + +/* Macros for creating and checking bitmasks for character encoding. + * Bit number is a bit counterintuitive, but minimizes code size. + */ +#define DUK__MKBITS(a,b,c,d,e,f,g,h) ((duk_uint8_t) ( \ + ((a) << 0) | ((b) << 1) | ((c) << 2) | ((d) << 3) | \ + ((e) << 4) | ((f) << 5) | ((g) << 6) | ((h) << 7) \ + )) +#define DUK__CHECK_BITMASK(table,cp) ((table)[(cp) >> 3] & (1 << ((cp) & 0x07))) + +/* E5.1 Section 15.1.3.3: uriReserved + uriUnescaped + '#' */ +DUK_LOCAL const duk_uint8_t duk__encode_uriunescaped_table[16] = { + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */ + DUK__MKBITS(0, 1, 0, 1, 1, 0, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x20-0x2f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 0, 1, 0, 1), /* 0x30-0x3f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x40-0x4f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 1), /* 0x50-0x5f */ + DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x60-0x6f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 0, 0, 0, 1, 0), /* 0x70-0x7f */ +}; + +/* E5.1 Section 15.1.3.4: uriUnescaped */ +DUK_LOCAL const duk_uint8_t duk__encode_uricomponent_unescaped_table[16] = { + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */ + DUK__MKBITS(0, 1, 0, 0, 0, 0, 0, 1), DUK__MKBITS(1, 1, 1, 0, 0, 1, 1, 0), /* 0x20-0x2f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 0, 0, 0, 0, 0, 0), /* 0x30-0x3f */ + DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x40-0x4f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 1), /* 0x50-0x5f */ + DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x60-0x6f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 0, 0, 0, 1, 0), /* 0x70-0x7f */ +}; + +/* E5.1 Section 15.1.3.1: uriReserved + '#' */ +DUK_LOCAL const duk_uint8_t duk__decode_uri_reserved_table[16] = { + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */ + DUK__MKBITS(0, 0, 0, 1, 1, 0, 1, 0), DUK__MKBITS(0, 0, 0, 1, 1, 0, 0, 1), /* 0x20-0x2f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 1, 1, 0, 1, 0, 1), /* 0x30-0x3f */ + DUK__MKBITS(1, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x40-0x4f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x50-0x5f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x60-0x6f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x70-0x7f */ +}; + +/* E5.1 Section 15.1.3.2: empty */ +DUK_LOCAL const duk_uint8_t duk__decode_uri_component_reserved_table[16] = { + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x20-0x2f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x30-0x3f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x40-0x4f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x50-0x5f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x60-0x6f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x70-0x7f */ +}; + +#if defined(DUK_USE_SECTION_B) +/* E5.1 Section B.2.2, step 7. */ +DUK_LOCAL const duk_uint8_t duk__escape_unescaped_table[16] = { + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */ + DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), DUK__MKBITS(0, 0, 1, 1, 0, 1, 1, 1), /* 0x20-0x2f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 0, 0, 0, 0, 0, 0), /* 0x30-0x3f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x40-0x4f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 1), /* 0x50-0x5f */ + DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x60-0x6f */ + DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 0) /* 0x70-0x7f */ +}; +#endif /* DUK_USE_SECTION_B */ + +typedef struct { + duk_hthread *thr; + duk_hstring *h_str; + duk_bufwriter_ctx bw; + const duk_uint8_t *p; + const duk_uint8_t *p_start; + const duk_uint8_t *p_end; +} duk__transform_context; + +typedef void (*duk__transform_callback)(duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp); + +/* XXX: refactor and share with other code */ +DUK_LOCAL duk_small_int_t duk__decode_hex_escape(const duk_uint8_t *p, duk_small_int_t n) { + duk_small_int_t ch; + duk_small_int_t t = 0; + + while (n > 0) { + t = t * 16; + ch = (duk_small_int_t) duk_hex_dectab[*p++]; + if (DUK_LIKELY(ch >= 0)) { + t += ch; + } else { + return -1; + } + n--; + } + return t; +} + +DUK_LOCAL int duk__transform_helper(duk_hthread *thr, duk__transform_callback callback, const void *udata) { + duk__transform_context tfm_ctx_alloc; + duk__transform_context *tfm_ctx = &tfm_ctx_alloc; + duk_codepoint_t cp; + + tfm_ctx->thr = thr; + + tfm_ctx->h_str = duk_to_hstring(thr, 0); + DUK_ASSERT(tfm_ctx->h_str != NULL); + + DUK_BW_INIT_PUSHBUF(thr, &tfm_ctx->bw, DUK_HSTRING_GET_BYTELEN(tfm_ctx->h_str)); /* initial size guess */ + + tfm_ctx->p_start = DUK_HSTRING_GET_DATA(tfm_ctx->h_str); + tfm_ctx->p_end = tfm_ctx->p_start + DUK_HSTRING_GET_BYTELEN(tfm_ctx->h_str); + tfm_ctx->p = tfm_ctx->p_start; + + while (tfm_ctx->p < tfm_ctx->p_end) { + cp = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(thr, &tfm_ctx->p, tfm_ctx->p_start, tfm_ctx->p_end); + callback(tfm_ctx, udata, cp); + } + + DUK_BW_COMPACT(thr, &tfm_ctx->bw); + + (void) duk_buffer_to_string(thr, -1); /* Safe if transform is safe. */ + return 1; +} + +DUK_LOCAL void duk__transform_callback_encode_uri(duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp) { + duk_uint8_t xutf8_buf[DUK_UNICODE_MAX_XUTF8_LENGTH]; + duk_small_int_t len; + duk_codepoint_t cp1, cp2; + duk_small_int_t i, t; + const duk_uint8_t *unescaped_table = (const duk_uint8_t *) udata; + + /* UTF-8 encoded bytes escaped as %xx%xx%xx... -> 3 * nbytes. + * Codepoint range is restricted so this is a slightly too large + * but doesn't matter. + */ + DUK_BW_ENSURE(tfm_ctx->thr, &tfm_ctx->bw, 3 * DUK_UNICODE_MAX_XUTF8_LENGTH); + + if (cp < 0) { + goto uri_error; + } else if ((cp < 0x80L) && DUK__CHECK_BITMASK(unescaped_table, cp)) { + DUK_BW_WRITE_RAW_U8(tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t) cp); + return; + } else if (cp >= 0xdc00L && cp <= 0xdfffL) { + goto uri_error; + } else if (cp >= 0xd800L && cp <= 0xdbffL) { + /* Needs lookahead */ + if (duk_unicode_decode_xutf8(tfm_ctx->thr, &tfm_ctx->p, tfm_ctx->p_start, tfm_ctx->p_end, (duk_ucodepoint_t *) &cp2) == 0) { + goto uri_error; + } + if (!(cp2 >= 0xdc00L && cp2 <= 0xdfffL)) { + goto uri_error; + } + cp1 = cp; + cp = (duk_codepoint_t) (((cp1 - 0xd800L) << 10) + (cp2 - 0xdc00L) + 0x10000L); + } else if (cp > 0x10ffffL) { + /* Although we can allow non-BMP characters (they'll decode + * back into surrogate pairs), we don't allow extended UTF-8 + * characters; they would encode to URIs which won't decode + * back because of strict UTF-8 checks in URI decoding. + * (However, we could just as well allow them here.) + */ + goto uri_error; + } else { + /* Non-BMP characters within valid UTF-8 range: encode as is. + * They'll decode back into surrogate pairs if the escaped + * output is decoded. + */ + ; + } + + len = duk_unicode_encode_xutf8((duk_ucodepoint_t) cp, xutf8_buf); + for (i = 0; i < len; i++) { + t = (duk_small_int_t) xutf8_buf[i]; + DUK_BW_WRITE_RAW_U8_3(tfm_ctx->thr, + &tfm_ctx->bw, + DUK_ASC_PERCENT, + (duk_uint8_t) duk_uc_nybbles[t >> 4], + (duk_uint8_t) duk_uc_nybbles[t & 0x0f]); + } + + return; + + uri_error: + DUK_ERROR_URI(tfm_ctx->thr, DUK_STR_INVALID_INPUT); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__transform_callback_decode_uri(duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp) { + const duk_uint8_t *reserved_table = (const duk_uint8_t *) udata; + duk_small_uint_t utf8_blen; + duk_codepoint_t min_cp; + duk_small_int_t t; /* must be signed */ + duk_small_uint_t i; + + /* Maximum write size: XUTF8 path writes max DUK_UNICODE_MAX_XUTF8_LENGTH, + * percent escape path writes max two times CESU-8 encoded BMP length. + */ + DUK_BW_ENSURE(tfm_ctx->thr, + &tfm_ctx->bw, + (DUK_UNICODE_MAX_XUTF8_LENGTH >= 2 * DUK_UNICODE_MAX_CESU8_BMP_LENGTH ? + DUK_UNICODE_MAX_XUTF8_LENGTH : DUK_UNICODE_MAX_CESU8_BMP_LENGTH)); + + if (cp == (duk_codepoint_t) '%') { + const duk_uint8_t *p = tfm_ctx->p; + duk_size_t left = (duk_size_t) (tfm_ctx->p_end - p); /* bytes left */ + + DUK_DDD(DUK_DDDPRINT("percent encoding, left=%ld", (long) left)); + + if (left < 2) { + goto uri_error; + } + + t = duk__decode_hex_escape(p, 2); + DUK_DDD(DUK_DDDPRINT("first byte: %ld", (long) t)); + if (t < 0) { + goto uri_error; + } + + if (t < 0x80) { + if (DUK__CHECK_BITMASK(reserved_table, t)) { + /* decode '%xx' to '%xx' if decoded char in reserved set */ + DUK_ASSERT(tfm_ctx->p - 1 >= tfm_ctx->p_start); + DUK_BW_WRITE_RAW_U8_3(tfm_ctx->thr, + &tfm_ctx->bw, + DUK_ASC_PERCENT, + p[0], + p[1]); + } else { + DUK_BW_WRITE_RAW_U8(tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t) t); + } + tfm_ctx->p += 2; + return; + } + + /* Decode UTF-8 codepoint from a sequence of hex escapes. The + * first byte of the sequence has been decoded to 't'. + * + * Note that UTF-8 validation must be strict according to the + * specification: E5.1 Section 15.1.3, decode algorithm step + * 4.d.vii.8. URIError from non-shortest encodings is also + * specifically noted in the spec. + */ + + DUK_ASSERT(t >= 0x80); + if (t < 0xc0) { + /* continuation byte */ + goto uri_error; + } else if (t < 0xe0) { + /* 110x xxxx; 2 bytes */ + utf8_blen = 2; + min_cp = 0x80L; + cp = t & 0x1f; + } else if (t < 0xf0) { + /* 1110 xxxx; 3 bytes */ + utf8_blen = 3; + min_cp = 0x800L; + cp = t & 0x0f; + } else if (t < 0xf8) { + /* 1111 0xxx; 4 bytes */ + utf8_blen = 4; + min_cp = 0x10000L; + cp = t & 0x07; + } else { + /* extended utf-8 not allowed for URIs */ + goto uri_error; + } + + if (left < utf8_blen * 3 - 1) { + /* '%xx%xx...%xx', p points to char after first '%' */ + goto uri_error; + } + + p += 3; + for (i = 1; i < utf8_blen; i++) { + /* p points to digit part ('%xy', p points to 'x') */ + t = duk__decode_hex_escape(p, 2); + DUK_DDD(DUK_DDDPRINT("i=%ld utf8_blen=%ld cp=%ld t=0x%02lx", + (long) i, (long) utf8_blen, (long) cp, (unsigned long) t)); + if (t < 0) { + goto uri_error; + } + if ((t & 0xc0) != 0x80) { + goto uri_error; + } + cp = (cp << 6) + (t & 0x3f); + p += 3; + } + p--; /* p overshoots */ + tfm_ctx->p = p; + + DUK_DDD(DUK_DDDPRINT("final cp=%ld, min_cp=%ld", (long) cp, (long) min_cp)); + + if (cp < min_cp || cp > 0x10ffffL || (cp >= 0xd800L && cp <= 0xdfffL)) { + goto uri_error; + } + + /* The E5.1 algorithm checks whether or not a decoded codepoint + * is below 0x80 and perhaps may be in the "reserved" set. + * This seems pointless because the single byte UTF-8 case is + * handled separately, and non-shortest encodings are rejected. + * So, 'cp' cannot be below 0x80 here, and thus cannot be in + * the reserved set. + */ + + /* utf-8 validation ensures these */ + DUK_ASSERT(cp >= 0x80L && cp <= 0x10ffffL); + + if (cp >= 0x10000L) { + cp -= 0x10000L; + DUK_ASSERT(cp < 0x100000L); + + DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, ((cp >> 10) + 0xd800L)); + DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, ((cp & 0x03ffL) + 0xdc00L)); + } else { + DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, cp); + } + } else { + DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, cp); + } + return; + + uri_error: + DUK_ERROR_URI(tfm_ctx->thr, DUK_STR_INVALID_INPUT); + DUK_WO_NORETURN(return;); +} + +#if defined(DUK_USE_SECTION_B) +DUK_LOCAL void duk__transform_callback_escape(duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp) { + DUK_UNREF(udata); + + DUK_BW_ENSURE(tfm_ctx->thr, &tfm_ctx->bw, 6); + + if (cp < 0) { + goto esc_error; + } else if ((cp < 0x80L) && DUK__CHECK_BITMASK(duk__escape_unescaped_table, cp)) { + DUK_BW_WRITE_RAW_U8(tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t) cp); + } else if (cp < 0x100L) { + DUK_BW_WRITE_RAW_U8_3(tfm_ctx->thr, + &tfm_ctx->bw, + (duk_uint8_t) DUK_ASC_PERCENT, + (duk_uint8_t) duk_uc_nybbles[cp >> 4], + (duk_uint8_t) duk_uc_nybbles[cp & 0x0f]); + } else if (cp < 0x10000L) { + DUK_BW_WRITE_RAW_U8_6(tfm_ctx->thr, + &tfm_ctx->bw, + (duk_uint8_t) DUK_ASC_PERCENT, + (duk_uint8_t) DUK_ASC_LC_U, + (duk_uint8_t) duk_uc_nybbles[cp >> 12], + (duk_uint8_t) duk_uc_nybbles[(cp >> 8) & 0x0f], + (duk_uint8_t) duk_uc_nybbles[(cp >> 4) & 0x0f], + (duk_uint8_t) duk_uc_nybbles[cp & 0x0f]); + } else { + /* Characters outside BMP cannot be escape()'d. We could + * encode them as surrogate pairs (for codepoints inside + * valid UTF-8 range, but not extended UTF-8). Because + * escape() and unescape() are legacy functions, we don't. + */ + goto esc_error; + } + + return; + + esc_error: + DUK_ERROR_TYPE(tfm_ctx->thr, DUK_STR_INVALID_INPUT); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__transform_callback_unescape(duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp) { + duk_small_int_t t; + + DUK_UNREF(udata); + + if (cp == (duk_codepoint_t) '%') { + const duk_uint8_t *p = tfm_ctx->p; + duk_size_t left = (duk_size_t) (tfm_ctx->p_end - p); /* bytes left */ + + if (left >= 5 && p[0] == 'u' && + ((t = duk__decode_hex_escape(p + 1, 4)) >= 0)) { + cp = (duk_codepoint_t) t; + tfm_ctx->p += 5; + } else if (left >= 2 && + ((t = duk__decode_hex_escape(p, 2)) >= 0)) { + cp = (duk_codepoint_t) t; + tfm_ctx->p += 2; + } + } + + DUK_BW_WRITE_ENSURE_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, cp); +} +#endif /* DUK_USE_SECTION_B */ + +/* + * Eval + * + * Eval needs to handle both a "direct eval" and an "indirect eval". + * Direct eval handling needs access to the caller's activation so that its + * lexical environment can be accessed. A direct eval is only possible from + * ECMAScript code; an indirect eval call is possible also from C code. + * When an indirect eval call is made from C code, there may not be a + * calling activation at all which needs careful handling. + */ + +DUK_INTERNAL duk_ret_t duk_bi_global_object_eval(duk_hthread *thr) { + duk_hstring *h; + duk_activation *act_caller; + duk_activation *act_eval; + duk_hcompfunc *func; + duk_hobject *outer_lex_env; + duk_hobject *outer_var_env; + duk_bool_t this_to_global = 1; + duk_small_uint_t comp_flags; + duk_int_t level = -2; + duk_small_uint_t call_flags; + + DUK_ASSERT(duk_get_top(thr) == 1 || duk_get_top(thr) == 2); /* 2 when called by debugger */ + DUK_ASSERT(thr->callstack_top >= 1); /* at least this function exists */ + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT((thr->callstack_curr->flags & DUK_ACT_FLAG_DIRECT_EVAL) == 0 || /* indirect eval */ + (thr->callstack_top >= 2)); /* if direct eval, calling activation must exist */ + + /* + * callstack_top - 1 --> this function + * callstack_top - 2 --> caller (may not exist) + * + * If called directly from C, callstack_top might be 1. If calling + * activation doesn't exist, call must be indirect. + */ + + h = duk_get_hstring_notsymbol(thr, 0); + if (!h) { + /* Symbol must be returned as is, like any non-string values. */ + return 1; /* return arg as-is */ + } + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + /* NOTE: level is used only by the debugger and should never be present + * for an ECMAScript eval(). + */ + DUK_ASSERT(level == -2); /* by default, use caller's environment */ + if (duk_get_top(thr) >= 2 && duk_is_number(thr, 1)) { + level = duk_get_int(thr, 1); + } + DUK_ASSERT(level <= -2); /* This is guaranteed by debugger code. */ +#endif + + /* [ source ] */ + + comp_flags = DUK_COMPILE_EVAL; + act_eval = thr->callstack_curr; /* this function */ + DUK_ASSERT(act_eval != NULL); + act_caller = duk_hthread_get_activation_for_level(thr, level); + if (act_caller != NULL) { + /* Have a calling activation, check for direct eval (otherwise + * assume indirect eval. + */ + if ((act_caller->flags & DUK_ACT_FLAG_STRICT) && + (act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL)) { + /* Only direct eval inherits strictness from calling code + * (E5.1 Section 10.1.1). + */ + comp_flags |= DUK_COMPILE_STRICT; + } + } else { + DUK_ASSERT((act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL) == 0); + } + + duk_push_hstring_stridx(thr, DUK_STRIDX_INPUT); /* XXX: copy from caller? */ + duk_js_compile(thr, + (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h), + (duk_size_t) DUK_HSTRING_GET_BYTELEN(h), + comp_flags); + func = (duk_hcompfunc *) duk_known_hobject(thr, -1); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) func)); + + /* [ source template ] */ + + /* E5 Section 10.4.2 */ + + if (act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL) { + DUK_ASSERT(thr->callstack_top >= 2); + DUK_ASSERT(act_caller != NULL); + if (act_caller->lex_env == NULL) { + DUK_ASSERT(act_caller->var_env == NULL); + DUK_DDD(DUK_DDDPRINT("delayed environment initialization")); + + /* this may have side effects, so re-lookup act */ + duk_js_init_activation_environment_records_delayed(thr, act_caller); + } + DUK_ASSERT(act_caller->lex_env != NULL); + DUK_ASSERT(act_caller->var_env != NULL); + + this_to_global = 0; + + if (DUK_HOBJECT_HAS_STRICT((duk_hobject *) func)) { + duk_hdecenv *new_env; + duk_hobject *act_lex_env; + + DUK_DDD(DUK_DDDPRINT("direct eval call to a strict function -> " + "var_env and lex_env to a fresh env, " + "this_binding to caller's this_binding")); + + act_lex_env = act_caller->lex_env; + + new_env = duk_hdecenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV)); + DUK_ASSERT(new_env != NULL); + duk_push_hobject(thr, (duk_hobject *) new_env); + + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) new_env) == NULL); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *) new_env, act_lex_env); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, act_lex_env); + DUK_DDD(DUK_DDDPRINT("new_env allocated: %!iO", (duk_heaphdr *) new_env)); + + outer_lex_env = (duk_hobject *) new_env; + outer_var_env = (duk_hobject *) new_env; + + duk_insert(thr, 0); /* stash to bottom of value stack to keep new_env reachable for duration of eval */ + + /* compiler's responsibility */ + DUK_ASSERT(DUK_HOBJECT_HAS_NEWENV((duk_hobject *) func)); + } else { + DUK_DDD(DUK_DDDPRINT("direct eval call to a non-strict function -> " + "var_env and lex_env to caller's envs, " + "this_binding to caller's this_binding")); + + outer_lex_env = act_caller->lex_env; + outer_var_env = act_caller->var_env; + + /* compiler's responsibility */ + DUK_ASSERT(!DUK_HOBJECT_HAS_NEWENV((duk_hobject *) func)); + } + } else { + DUK_DDD(DUK_DDDPRINT("indirect eval call -> var_env and lex_env to " + "global object, this_binding to global object")); + + this_to_global = 1; + outer_lex_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + outer_var_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + } + + /* Eval code doesn't need an automatic .prototype object. */ + duk_js_push_closure(thr, func, outer_var_env, outer_lex_env, 0 /*add_auto_proto*/); + + /* [ env? source template closure ] */ + + if (this_to_global) { + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + duk_push_hobject_bidx(thr, DUK_BIDX_GLOBAL); + } else { + duk_tval *tv; + DUK_ASSERT(thr->callstack_top >= 2); + DUK_ASSERT(act_caller != NULL); + tv = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + act_caller->bottom_byteoff - sizeof(duk_tval)); /* this is just beneath bottom */ + DUK_ASSERT(tv >= thr->valstack); + duk_push_tval(thr, tv); + } + + DUK_DDD(DUK_DDDPRINT("eval -> lex_env=%!iO, var_env=%!iO, this_binding=%!T", + (duk_heaphdr *) outer_lex_env, + (duk_heaphdr *) outer_var_env, + duk_get_tval(thr, -1))); + + /* [ env? source template closure this ] */ + + call_flags = 0; + if (act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL) { + /* Set DIRECT_EVAL flag for the call; it's not strictly + * needed for the 'inner' eval call (the eval body) but + * current new.target implementation expects to find it + * so it can traverse direct eval chains up to the real + * calling function. + */ + call_flags |= DUK_CALL_FLAG_DIRECT_EVAL; + } + duk_handle_call_unprotected_nargs(thr, 0, call_flags); + + /* [ env? source template result ] */ + + return 1; +} + +/* + * Parsing of ints and floats + */ + +#if defined(DUK_USE_GLOBAL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_global_object_parse_int(duk_hthread *thr) { + duk_int32_t radix; + duk_small_uint_t s2n_flags; + + DUK_ASSERT_TOP(thr, 2); + duk_to_string(thr, 0); /* Reject symbols. */ + + radix = duk_to_int32(thr, 1); + + /* While parseInt() recognizes 0xdeadbeef, it doesn't recognize + * ES2015 0o123 or 0b10001. + */ + s2n_flags = DUK_S2N_FLAG_TRIM_WHITE | + DUK_S2N_FLAG_ALLOW_GARBAGE | + DUK_S2N_FLAG_ALLOW_PLUS | + DUK_S2N_FLAG_ALLOW_MINUS | + DUK_S2N_FLAG_ALLOW_LEADING_ZERO | + DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT; + + /* Specification stripPrefix maps to DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT. + * + * Don't autodetect octals (from leading zeroes), require user code to + * provide an explicit radix 8 for parsing octal. See write-up from Mozilla: + * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt#ECMAScript_5_Removes_Octal_Interpretation + */ + + if (radix != 0) { + if (radix < 2 || radix > 36) { + goto ret_nan; + } + if (radix != 16) { + s2n_flags &= ~DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT; + } + } else { + radix = 10; + } + + duk_dup_0(thr); + duk_numconv_parse(thr, (duk_small_int_t) radix, s2n_flags); + return 1; + + ret_nan: + duk_push_nan(thr); + return 1; +} +#endif /* DUK_USE_GLOBAL_BUILTIN */ + +#if defined(DUK_USE_GLOBAL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_global_object_parse_float(duk_hthread *thr) { + duk_small_uint_t s2n_flags; + + DUK_ASSERT_TOP(thr, 1); + duk_to_string(thr, 0); /* Reject symbols. */ + + /* XXX: check flags */ + s2n_flags = DUK_S2N_FLAG_TRIM_WHITE | + DUK_S2N_FLAG_ALLOW_EXP | + DUK_S2N_FLAG_ALLOW_GARBAGE | + DUK_S2N_FLAG_ALLOW_PLUS | + DUK_S2N_FLAG_ALLOW_MINUS | + DUK_S2N_FLAG_ALLOW_INF | + DUK_S2N_FLAG_ALLOW_FRAC | + DUK_S2N_FLAG_ALLOW_NAKED_FRAC | + DUK_S2N_FLAG_ALLOW_EMPTY_FRAC | + DUK_S2N_FLAG_ALLOW_LEADING_ZERO; + + duk_numconv_parse(thr, 10 /*radix*/, s2n_flags); + return 1; +} +#endif /* DUK_USE_GLOBAL_BUILTIN */ + +/* + * Number checkers + */ + +#if defined(DUK_USE_GLOBAL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_global_object_is_nan(duk_hthread *thr) { + duk_double_t d = duk_to_number(thr, 0); + duk_push_boolean(thr, (duk_bool_t) DUK_ISNAN(d)); + return 1; +} +#endif /* DUK_USE_GLOBAL_BUILTIN */ + +#if defined(DUK_USE_GLOBAL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_global_object_is_finite(duk_hthread *thr) { + duk_double_t d = duk_to_number(thr, 0); + duk_push_boolean(thr, (duk_bool_t) DUK_ISFINITE(d)); + return 1; +} +#endif /* DUK_USE_GLOBAL_BUILTIN */ + +/* + * URI handling + */ + +#if defined(DUK_USE_GLOBAL_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_global_object_decode_uri(duk_hthread *thr) { + return duk__transform_helper(thr, duk__transform_callback_decode_uri, (const void *) duk__decode_uri_reserved_table); +} + +DUK_INTERNAL duk_ret_t duk_bi_global_object_decode_uri_component(duk_hthread *thr) { + return duk__transform_helper(thr, duk__transform_callback_decode_uri, (const void *) duk__decode_uri_component_reserved_table); +} + +DUK_INTERNAL duk_ret_t duk_bi_global_object_encode_uri(duk_hthread *thr) { + return duk__transform_helper(thr, duk__transform_callback_encode_uri, (const void *) duk__encode_uriunescaped_table); +} + +DUK_INTERNAL duk_ret_t duk_bi_global_object_encode_uri_component(duk_hthread *thr) { + return duk__transform_helper(thr, duk__transform_callback_encode_uri, (const void *) duk__encode_uricomponent_unescaped_table); +} + +#if defined(DUK_USE_SECTION_B) +DUK_INTERNAL duk_ret_t duk_bi_global_object_escape(duk_hthread *thr) { + return duk__transform_helper(thr, duk__transform_callback_escape, (const void *) NULL); +} + +DUK_INTERNAL duk_ret_t duk_bi_global_object_unescape(duk_hthread *thr) { + return duk__transform_helper(thr, duk__transform_callback_unescape, (const void *) NULL); +} +#endif /* DUK_USE_SECTION_B */ +#endif /* DUK_USE_GLOBAL_BUILTIN */ + +/* automatic undefs */ +#undef DUK__CHECK_BITMASK +#undef DUK__MKBITS +#line 1 "duk_bi_json.c" +/* + * JSON built-ins. + * + * See doc/json.rst. + * + * Codepoints are handled as duk_uint_fast32_t to ensure that the full + * unsigned 32-bit range is supported. This matters to e.g. JX. + * + * Input parsing doesn't do an explicit end-of-input check at all. This is + * safe: input string data is always NUL-terminated (0x00) and valid JSON + * inputs never contain plain NUL characters, so that as long as syntax checks + * are correct, we'll never read past the NUL. This approach reduces code size + * and improves parsing performance, but it's critical that syntax checks are + * indeed correct! + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_JSON_SUPPORT) + +/* + * Local defines and forward declarations. + */ + +#define DUK__JSON_DECSTR_BUFSIZE 128 +#define DUK__JSON_DECSTR_CHUNKSIZE 64 +#define DUK__JSON_ENCSTR_CHUNKSIZE 64 +#define DUK__JSON_STRINGIFY_BUFSIZE 128 +#define DUK__JSON_MAX_ESC_LEN 10 /* '\Udeadbeef' */ + +DUK_LOCAL_DECL void duk__dec_syntax_error(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_eat_white(duk_json_dec_ctx *js_ctx); +#if defined(DUK_USE_JX) +DUK_LOCAL_DECL duk_uint8_t duk__dec_peek(duk_json_dec_ctx *js_ctx); +#endif +DUK_LOCAL_DECL duk_uint8_t duk__dec_get(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL duk_uint8_t duk__dec_get_nonwhite(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL duk_uint_fast32_t duk__dec_decode_hex_escape(duk_json_dec_ctx *js_ctx, duk_small_uint_t n); +DUK_LOCAL_DECL void duk__dec_req_stridx(duk_json_dec_ctx *js_ctx, duk_small_uint_t stridx); +DUK_LOCAL_DECL void duk__dec_string(duk_json_dec_ctx *js_ctx); +#if defined(DUK_USE_JX) +DUK_LOCAL_DECL void duk__dec_plain_string(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_pointer(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_buffer(duk_json_dec_ctx *js_ctx); +#endif +DUK_LOCAL_DECL void duk__dec_number(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_objarr_entry(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_objarr_exit(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_object(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_array(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_value(duk_json_dec_ctx *js_ctx); +DUK_LOCAL_DECL void duk__dec_reviver_walk(duk_json_dec_ctx *js_ctx); + +DUK_LOCAL_DECL void duk__emit_1(duk_json_enc_ctx *js_ctx, duk_uint_fast8_t ch); +DUK_LOCAL_DECL void duk__emit_2(duk_json_enc_ctx *js_ctx, duk_uint_fast8_t ch1, duk_uint_fast8_t ch2); +DUK_LOCAL_DECL void duk__unemit_1(duk_json_enc_ctx *js_ctx); +DUK_LOCAL_DECL void duk__emit_hstring(duk_json_enc_ctx *js_ctx, duk_hstring *h); +#if defined(DUK_USE_FASTINT) +DUK_LOCAL_DECL void duk__emit_cstring(duk_json_enc_ctx *js_ctx, const char *p); +#endif +DUK_LOCAL_DECL void duk__emit_stridx(duk_json_enc_ctx *js_ctx, duk_small_uint_t stridx); +DUK_LOCAL_DECL duk_uint8_t *duk__emit_esc_auto_fast(duk_json_enc_ctx *js_ctx, duk_uint_fast32_t cp, duk_uint8_t *q); +DUK_LOCAL_DECL void duk__enc_key_autoquote(duk_json_enc_ctx *js_ctx, duk_hstring *k); +DUK_LOCAL_DECL void duk__enc_quote_string(duk_json_enc_ctx *js_ctx, duk_hstring *h_str); +DUK_LOCAL_DECL void duk__enc_objarr_entry(duk_json_enc_ctx *js_ctx, duk_idx_t *entry_top); +DUK_LOCAL_DECL void duk__enc_objarr_exit(duk_json_enc_ctx *js_ctx, duk_idx_t *entry_top); +DUK_LOCAL_DECL void duk__enc_object(duk_json_enc_ctx *js_ctx); +DUK_LOCAL_DECL void duk__enc_array(duk_json_enc_ctx *js_ctx); +DUK_LOCAL_DECL duk_bool_t duk__enc_value(duk_json_enc_ctx *js_ctx, duk_idx_t idx_holder); +DUK_LOCAL_DECL duk_bool_t duk__enc_allow_into_proplist(duk_tval *tv); +DUK_LOCAL_DECL void duk__enc_double(duk_json_enc_ctx *js_ctx); +#if defined(DUK_USE_FASTINT) +DUK_LOCAL_DECL void duk__enc_fastint_tval(duk_json_enc_ctx *js_ctx, duk_tval *tv); +#endif +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) +DUK_LOCAL_DECL void duk__enc_buffer_jx_jc(duk_json_enc_ctx *js_ctx, duk_hbuffer *h); +DUK_LOCAL_DECL void duk__enc_pointer(duk_json_enc_ctx *js_ctx, void *ptr); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_LOCAL_DECL void duk__enc_bufobj(duk_json_enc_ctx *js_ctx, duk_hbufobj *h_bufobj); +#endif +#endif +#if defined(DUK_USE_JSON_STRINGIFY_FASTPATH) +DUK_LOCAL_DECL void duk__enc_buffer_json_fastpath(duk_json_enc_ctx *js_ctx, duk_hbuffer *h); +#endif +DUK_LOCAL_DECL void duk__enc_newline_indent(duk_json_enc_ctx *js_ctx, duk_uint_t depth); + +/* + * Helper tables + */ + +#if defined(DUK_USE_JSON_QUOTESTRING_FASTPATH) +DUK_LOCAL const duk_uint8_t duk__json_quotestr_lookup[256] = { + /* 0x00 ... 0x7f: as is + * 0x80: escape generically + * 0x81: slow path + * 0xa0 ... 0xff: backslash + one char + */ + + 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xe2, 0xf4, 0xee, 0x80, 0xe6, 0xf2, 0x80, 0x80, + 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, + 0x20, 0x21, 0xa2, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, + 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0xdc, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, + 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81 +}; +#else /* DUK_USE_JSON_QUOTESTRING_FASTPATH */ +DUK_LOCAL const duk_uint8_t duk__json_quotestr_esc[14] = { + DUK_ASC_NUL, DUK_ASC_NUL, DUK_ASC_NUL, DUK_ASC_NUL, + DUK_ASC_NUL, DUK_ASC_NUL, DUK_ASC_NUL, DUK_ASC_NUL, + DUK_ASC_LC_B, DUK_ASC_LC_T, DUK_ASC_LC_N, DUK_ASC_NUL, + DUK_ASC_LC_F, DUK_ASC_LC_R +}; +#endif /* DUK_USE_JSON_QUOTESTRING_FASTPATH */ + +#if defined(DUK_USE_JSON_DECSTRING_FASTPATH) +DUK_LOCAL const duk_uint8_t duk__json_decstr_lookup[256] = { + /* 0x00: slow path + * other: as is + */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x20, 0x21, 0x00, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, + 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x00, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, + 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, + 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, + 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff +}; +#endif /* DUK_USE_JSON_DECSTRING_FASTPATH */ + +#if defined(DUK_USE_JSON_EATWHITE_FASTPATH) +DUK_LOCAL const duk_uint8_t duk__json_eatwhite_lookup[256] = { + /* 0x00: finish (non-white) + * 0x01: continue + */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; +#endif /* DUK_USE_JSON_EATWHITE_FASTPATH */ + +#if defined(DUK_USE_JSON_DECNUMBER_FASTPATH) +DUK_LOCAL const duk_uint8_t duk__json_decnumber_lookup[256] = { + /* 0x00: finish (not part of number) + * 0x01: continue + */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x01, 0x00, + 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; +#endif /* DUK_USE_JSON_DECNUMBER_FASTPATH */ + +/* + * Parsing implementation. + * + * JSON lexer is now separate from duk_lexer.c because there are numerous + * small differences making it difficult to share the lexer. + * + * The parser here works with raw bytes directly; this works because all + * JSON delimiters are ASCII characters. Invalid xUTF-8 encoded values + * inside strings will be passed on without normalization; this is not a + * compliance concern because compliant inputs will always be valid + * CESU-8 encodings. + */ + +DUK_LOCAL void duk__dec_syntax_error(duk_json_dec_ctx *js_ctx) { + /* Shared handler to minimize parser size. Cause will be + * hidden, unfortunately, but we'll have an offset which + * is often quite enough. + */ + DUK_ERROR_FMT1(js_ctx->thr, DUK_ERR_SYNTAX_ERROR, DUK_STR_FMT_INVALID_JSON, + (long) (js_ctx->p - js_ctx->p_start)); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__dec_eat_white(duk_json_dec_ctx *js_ctx) { + const duk_uint8_t *p; + duk_uint8_t t; + + p = js_ctx->p; + for (;;) { + DUK_ASSERT(p <= js_ctx->p_end); + t = *p; + +#if defined(DUK_USE_JSON_EATWHITE_FASTPATH) + /* This fast path is pretty marginal in practice. + * XXX: candidate for removal. + */ + DUK_ASSERT(duk__json_eatwhite_lookup[0x00] == 0x00); /* end-of-input breaks */ + if (duk__json_eatwhite_lookup[t] == 0) { + break; + } +#else /* DUK_USE_JSON_EATWHITE_FASTPATH */ + if (!(t == 0x20 || t == 0x0a || t == 0x0d || t == 0x09)) { + /* NUL also comes here. Comparison order matters, 0x20 + * is most common whitespace. + */ + break; + } +#endif /* DUK_USE_JSON_EATWHITE_FASTPATH */ + p++; + } + js_ctx->p = p; +} + +#if defined(DUK_USE_JX) +DUK_LOCAL duk_uint8_t duk__dec_peek(duk_json_dec_ctx *js_ctx) { + DUK_ASSERT(js_ctx->p <= js_ctx->p_end); + return *js_ctx->p; +} +#endif + +DUK_LOCAL duk_uint8_t duk__dec_get(duk_json_dec_ctx *js_ctx) { + DUK_ASSERT(js_ctx->p <= js_ctx->p_end); + return *js_ctx->p++; +} + +DUK_LOCAL duk_uint8_t duk__dec_get_nonwhite(duk_json_dec_ctx *js_ctx) { + duk__dec_eat_white(js_ctx); + return duk__dec_get(js_ctx); +} + +/* For JX, expressing the whole unsigned 32-bit range matters. */ +DUK_LOCAL duk_uint_fast32_t duk__dec_decode_hex_escape(duk_json_dec_ctx *js_ctx, duk_small_uint_t n) { + duk_small_uint_t i; + duk_uint_fast32_t res = 0; + duk_uint8_t x; + duk_small_int_t t; + + for (i = 0; i < n; i++) { + /* XXX: share helper from lexer; duk_lexer.c / hexval(). */ + + x = duk__dec_get(js_ctx); + DUK_DDD(DUK_DDDPRINT("decode_hex_escape: i=%ld, n=%ld, res=%ld, x=%ld", + (long) i, (long) n, (long) res, (long) x)); + + /* x == 0x00 (EOF) causes syntax_error */ + DUK_ASSERT(duk_hex_dectab[0] == -1); + t = duk_hex_dectab[x & 0xff]; + if (DUK_LIKELY(t >= 0)) { + res = (res * 16) + (duk_uint_fast32_t) t; + } else { + /* catches EOF and invalid digits */ + goto syntax_error; + } + } + + DUK_DDD(DUK_DDDPRINT("final hex decoded value: %ld", (long) res)); + return res; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); + return 0; +} + +DUK_LOCAL void duk__dec_req_stridx(duk_json_dec_ctx *js_ctx, duk_small_uint_t stridx) { + duk_hstring *h; + const duk_uint8_t *p; + duk_uint8_t x, y; + + /* First character has already been eaten and checked by the caller. + * We can scan until a NUL in stridx string because no built-in strings + * have internal NULs. + */ + + DUK_ASSERT_STRIDX_VALID(stridx); + h = DUK_HTHREAD_GET_STRING(js_ctx->thr, stridx); + DUK_ASSERT(h != NULL); + + p = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h) + 1; + DUK_ASSERT(*(js_ctx->p - 1) == *(p - 1)); /* first character has been matched */ + + for (;;) { + x = *p; + if (x == 0) { + break; + } + y = duk__dec_get(js_ctx); + if (x != y) { + /* Catches EOF of JSON input. */ + goto syntax_error; + } + p++; + } + + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} + +DUK_LOCAL duk_small_int_t duk__dec_string_escape(duk_json_dec_ctx *js_ctx, duk_uint8_t **ext_p) { + duk_uint_fast32_t cp; + + /* EOF (-1) will be cast to an unsigned value first + * and then re-cast for the switch. In any case, it + * will match the default case (syntax error). + */ + cp = (duk_uint_fast32_t) duk__dec_get(js_ctx); + switch (cp) { + case DUK_ASC_BACKSLASH: break; + case DUK_ASC_DOUBLEQUOTE: break; + case DUK_ASC_SLASH: break; + case DUK_ASC_LC_T: cp = 0x09; break; + case DUK_ASC_LC_N: cp = 0x0a; break; + case DUK_ASC_LC_R: cp = 0x0d; break; + case DUK_ASC_LC_F: cp = 0x0c; break; + case DUK_ASC_LC_B: cp = 0x08; break; + case DUK_ASC_LC_U: { + cp = duk__dec_decode_hex_escape(js_ctx, 4); + break; + } +#if defined(DUK_USE_JX) + case DUK_ASC_UC_U: { + if (js_ctx->flag_ext_custom) { + cp = duk__dec_decode_hex_escape(js_ctx, 8); + } else { + return 1; /* syntax error */ + } + break; + } + case DUK_ASC_LC_X: { + if (js_ctx->flag_ext_custom) { + cp = duk__dec_decode_hex_escape(js_ctx, 2); + } else { + return 1; /* syntax error */ + } + break; + } +#endif /* DUK_USE_JX */ + default: + /* catches EOF (0x00) */ + return 1; /* syntax error */ + } + + DUK_RAW_WRITE_XUTF8(*ext_p, cp); + + return 0; +} + +DUK_LOCAL void duk__dec_string(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_bufwriter_ctx bw_alloc; + duk_bufwriter_ctx *bw; + duk_uint8_t *q; + + /* '"' was eaten by caller */ + + /* Note that we currently parse -bytes-, not codepoints. + * All non-ASCII extended UTF-8 will encode to bytes >= 0x80, + * so they'll simply pass through (valid UTF-8 or not). + */ + + bw = &bw_alloc; + DUK_BW_INIT_PUSHBUF(js_ctx->thr, bw, DUK__JSON_DECSTR_BUFSIZE); + q = DUK_BW_GET_PTR(js_ctx->thr, bw); + +#if defined(DUK_USE_JSON_DECSTRING_FASTPATH) + for (;;) { + duk_small_uint_t safe; + duk_uint8_t b, x; + const duk_uint8_t *p; + + /* Select a safe loop count where no output checks are + * needed assuming we won't encounter escapes. Input + * bound checks are not necessary as a NUL (guaranteed) + * will cause a SyntaxError before we read out of bounds. + */ + + safe = DUK__JSON_DECSTR_CHUNKSIZE; + + /* Ensure space for 1:1 output plus one escape. */ + q = DUK_BW_ENSURE_RAW(js_ctx->thr, bw, safe + DUK_UNICODE_MAX_XUTF8_LENGTH, q); + + p = js_ctx->p; /* temp copy, write back for next loop */ + for (;;) { + if (safe == 0) { + js_ctx->p = p; + break; + } + safe--; + + /* End of input (NUL) goes through slow path and causes SyntaxError. */ + DUK_ASSERT(duk__json_decstr_lookup[0] == 0x00); + + b = *p++; + x = (duk_small_int_t) duk__json_decstr_lookup[b]; + if (DUK_LIKELY(x != 0)) { + /* Fast path, decode as is. */ + *q++ = b; + } else if (b == DUK_ASC_DOUBLEQUOTE) { + js_ctx->p = p; + goto found_quote; + } else if (b == DUK_ASC_BACKSLASH) { + /* We've ensured space for one escaped input; then + * bail out and recheck (this makes escape handling + * quite slow but it's uncommon). + */ + js_ctx->p = p; + if (duk__dec_string_escape(js_ctx, &q) != 0) { + goto syntax_error; + } + break; + } else { + js_ctx->p = p; + goto syntax_error; + } + } + } + found_quote: +#else /* DUK_USE_JSON_DECSTRING_FASTPATH */ + for (;;) { + duk_uint8_t x; + + q = DUK_BW_ENSURE_RAW(js_ctx->thr, bw, DUK_UNICODE_MAX_XUTF8_LENGTH, q); + + x = duk__dec_get(js_ctx); + + if (x == DUK_ASC_DOUBLEQUOTE) { + break; + } else if (x == DUK_ASC_BACKSLASH) { + if (duk__dec_string_escape(js_ctx, &q) != 0) { + goto syntax_error; + } + } else if (x < 0x20) { + /* catches EOF (NUL) */ + goto syntax_error; + } else { + *q++ = (duk_uint8_t) x; + } + } +#endif /* DUK_USE_JSON_DECSTRING_FASTPATH */ + + DUK_BW_SETPTR_AND_COMPACT(js_ctx->thr, bw, q); + (void) duk_buffer_to_string(thr, -1); /* Safe if input string is safe. */ + + /* [ ... str ] */ + + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} + +#if defined(DUK_USE_JX) +/* Decode a plain string consisting entirely of identifier characters. + * Used to parse plain keys (e.g. "foo: 123"). + */ +DUK_LOCAL void duk__dec_plain_string(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + const duk_uint8_t *p; + duk_small_int_t x; + + /* Caller has already eaten the first char so backtrack one byte. */ + + js_ctx->p--; /* safe */ + p = js_ctx->p; + + /* Here again we parse bytes, and non-ASCII UTF-8 will cause end of + * parsing (which is correct except if there are non-shortest encodings). + * There is also no need to check explicitly for end of input buffer as + * the input is NUL padded and NUL will exit the parsing loop. + * + * Because no unescaping takes place, we can just scan to the end of the + * plain string and intern from the input buffer. + */ + + for (;;) { + x = *p; + + /* There is no need to check the first character specially here + * (i.e. reject digits): the caller only accepts valid initial + * characters and won't call us if the first character is a digit. + * This also ensures that the plain string won't be empty. + */ + + if (!duk_unicode_is_identifier_part((duk_codepoint_t) x)) { + break; + } + p++; + } + + duk_push_lstring(thr, (const char *) js_ctx->p, (duk_size_t) (p - js_ctx->p)); + js_ctx->p = p; + + /* [ ... str ] */ +} +#endif /* DUK_USE_JX */ + +#if defined(DUK_USE_JX) +DUK_LOCAL void duk__dec_pointer(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + const duk_uint8_t *p; + duk_small_int_t x; + void *voidptr; + + /* Caller has already eaten the first character ('(') which we don't need. */ + + p = js_ctx->p; + + for (;;) { + x = *p; + + /* Assume that the native representation never contains a closing + * parenthesis. + */ + + if (x == DUK_ASC_RPAREN) { + break; + } else if (x <= 0) { + /* NUL term or -1 (EOF), NUL check would suffice */ + goto syntax_error; + } + p++; + } + + /* There is no need to NUL delimit the sscanf() call: trailing garbage is + * ignored and there is always a NUL terminator which will force an error + * if no error is encountered before it. It's possible that the scan + * would scan further than between [js_ctx->p,p[ though and we'd advance + * by less than the scanned value. + * + * Because pointers are platform specific, a failure to scan a pointer + * results in a null pointer which is a better placeholder than a missing + * value or an error. + */ + + voidptr = NULL; + (void) DUK_SSCANF((const char *) js_ctx->p, DUK_STR_FMT_PTR, &voidptr); + duk_push_pointer(thr, voidptr); + js_ctx->p = p + 1; /* skip ')' */ + + /* [ ... ptr ] */ + + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} +#endif /* DUK_USE_JX */ + +#if defined(DUK_USE_JX) +DUK_LOCAL void duk__dec_buffer(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + const duk_uint8_t *p; + duk_uint8_t *buf; + duk_size_t src_len; + duk_small_int_t x; + + /* Caller has already eaten the first character ('|') which we don't need. */ + + p = js_ctx->p; + + /* XXX: Would be nice to share the fast path loop from duk_hex_decode() + * and avoid creating a temporary buffer. However, there are some + * differences which prevent trivial sharing: + * + * - Pipe char detection + * - EOF detection + * - Unknown length of input and output + * + * The best approach here would be a bufwriter and a reasonaly sized + * safe inner loop (e.g. 64 output bytes at a time). + */ + + for (;;) { + x = *p; + + /* This loop intentionally does not ensure characters are valid + * ([0-9a-fA-F]) because the hex decode call below will do that. + */ + if (x == DUK_ASC_PIPE) { + break; + } else if (x <= 0) { + /* NUL term or -1 (EOF), NUL check would suffice */ + goto syntax_error; + } + p++; + } + + /* XXX: this is not very nice; unnecessary copy is made. */ + src_len = (duk_size_t) (p - js_ctx->p); + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, src_len); + DUK_ASSERT(buf != NULL); + duk_memcpy((void *) buf, (const void *) js_ctx->p, src_len); + duk_hex_decode(thr, -1); + + js_ctx->p = p + 1; /* skip '|' */ + + /* [ ... buf ] */ + + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} +#endif /* DUK_USE_JX */ + +/* Parse a number, other than NaN or +/- Infinity */ +DUK_LOCAL void duk__dec_number(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + const duk_uint8_t *p_start; + const duk_uint8_t *p; + duk_uint8_t x; + duk_small_uint_t s2n_flags; + + DUK_DDD(DUK_DDDPRINT("parse_number")); + + p_start = js_ctx->p; + + /* First pass parse is very lenient (e.g. allows '1.2.3') and extracts a + * string for strict number parsing. + */ + + p = js_ctx->p; + for (;;) { + x = *p; + + DUK_DDD(DUK_DDDPRINT("parse_number: p_start=%p, p=%p, p_end=%p, x=%ld", + (const void *) p_start, (const void *) p, + (const void *) js_ctx->p_end, (long) x)); + +#if defined(DUK_USE_JSON_DECNUMBER_FASTPATH) + /* This fast path is pretty marginal in practice. + * XXX: candidate for removal. + */ + DUK_ASSERT(duk__json_decnumber_lookup[0x00] == 0x00); /* end-of-input breaks */ + if (duk__json_decnumber_lookup[x] == 0) { + break; + } +#else /* DUK_USE_JSON_DECNUMBER_FASTPATH */ + if (!((x >= DUK_ASC_0 && x <= DUK_ASC_9) || + (x == DUK_ASC_PERIOD || x == DUK_ASC_LC_E || + x == DUK_ASC_UC_E || x == DUK_ASC_MINUS || x == DUK_ASC_PLUS))) { + /* Plus sign must be accepted for positive exponents + * (e.g. '1.5e+2'). This clause catches NULs. + */ + break; + } +#endif /* DUK_USE_JSON_DECNUMBER_FASTPATH */ + p++; /* safe, because matched (NUL causes a break) */ + } + js_ctx->p = p; + + DUK_ASSERT(js_ctx->p > p_start); + duk_push_lstring(thr, (const char *) p_start, (duk_size_t) (p - p_start)); + + s2n_flags = DUK_S2N_FLAG_ALLOW_EXP | + DUK_S2N_FLAG_ALLOW_MINUS | /* but don't allow leading plus */ + DUK_S2N_FLAG_ALLOW_FRAC; + + DUK_DDD(DUK_DDDPRINT("parse_number: string before parsing: %!T", + (duk_tval *) duk_get_tval(thr, -1))); + duk_numconv_parse(thr, 10 /*radix*/, s2n_flags); + if (duk_is_nan(thr, -1)) { + duk__dec_syntax_error(js_ctx); + } + DUK_ASSERT(duk_is_number(thr, -1)); + DUK_DDD(DUK_DDDPRINT("parse_number: final number: %!T", + (duk_tval *) duk_get_tval(thr, -1))); + + /* [ ... num ] */ +} + +DUK_LOCAL void duk__dec_objarr_entry(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_require_stack(thr, DUK_JSON_DEC_REQSTACK); + + /* c recursion check */ + + DUK_ASSERT_DISABLE(js_ctx->recursion_depth >= 0); /* unsigned */ + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + if (js_ctx->recursion_depth >= js_ctx->recursion_limit) { + DUK_ERROR_RANGE(thr, DUK_STR_JSONDEC_RECLIMIT); + DUK_WO_NORETURN(return;); + } + js_ctx->recursion_depth++; +} + +DUK_LOCAL void duk__dec_objarr_exit(duk_json_dec_ctx *js_ctx) { + /* c recursion check */ + + DUK_ASSERT(js_ctx->recursion_depth > 0); + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + js_ctx->recursion_depth--; +} + +DUK_LOCAL void duk__dec_object(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_int_t key_count; /* XXX: a "first" flag would suffice */ + duk_uint8_t x; + + DUK_DDD(DUK_DDDPRINT("parse_object")); + + duk__dec_objarr_entry(js_ctx); + + duk_push_object(thr); + + /* Initial '{' has been checked and eaten by caller. */ + + key_count = 0; + for (;;) { + x = duk__dec_get_nonwhite(js_ctx); + + DUK_DDD(DUK_DDDPRINT("parse_object: obj=%!T, x=%ld, key_count=%ld", + (duk_tval *) duk_get_tval(thr, -1), + (long) x, (long) key_count)); + + /* handle comma and closing brace */ + + if (x == DUK_ASC_COMMA && key_count > 0) { + /* accept comma, expect new value */ + x = duk__dec_get_nonwhite(js_ctx); + } else if (x == DUK_ASC_RCURLY) { + /* eat closing brace */ + break; + } else if (key_count == 0) { + /* accept anything, expect first value (EOF will be + * caught by key parsing below. + */ + ; + } else { + /* catches EOF (NUL) and initial comma */ + goto syntax_error; + } + + /* parse key and value */ + + if (x == DUK_ASC_DOUBLEQUOTE) { + duk__dec_string(js_ctx); +#if defined(DUK_USE_JX) + } else if (js_ctx->flag_ext_custom && + duk_unicode_is_identifier_start((duk_codepoint_t) x)) { + duk__dec_plain_string(js_ctx); +#endif + } else { + goto syntax_error; + } + + /* [ ... obj key ] */ + + x = duk__dec_get_nonwhite(js_ctx); + if (x != DUK_ASC_COLON) { + goto syntax_error; + } + + duk__dec_value(js_ctx); + + /* [ ... obj key val ] */ + + duk_xdef_prop_wec(thr, -3); + + /* [ ... obj ] */ + + key_count++; + } + + /* [ ... obj ] */ + + DUK_DDD(DUK_DDDPRINT("parse_object: final object is %!T", + (duk_tval *) duk_get_tval(thr, -1))); + + duk__dec_objarr_exit(js_ctx); + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} + +DUK_LOCAL void duk__dec_array(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_uarridx_t arr_idx; + duk_uint8_t x; + + DUK_DDD(DUK_DDDPRINT("parse_array")); + + duk__dec_objarr_entry(js_ctx); + + duk_push_array(thr); + + /* Initial '[' has been checked and eaten by caller. */ + + arr_idx = 0; + for (;;) { + x = duk__dec_get_nonwhite(js_ctx); + + DUK_DDD(DUK_DDDPRINT("parse_array: arr=%!T, x=%ld, arr_idx=%ld", + (duk_tval *) duk_get_tval(thr, -1), + (long) x, (long) arr_idx)); + + /* handle comma and closing bracket */ + + if ((x == DUK_ASC_COMMA) && (arr_idx != 0)) { + /* accept comma, expect new value */ + ; + } else if (x == DUK_ASC_RBRACKET) { + /* eat closing bracket */ + break; + } else if (arr_idx == 0) { + /* accept anything, expect first value (EOF will be + * caught by duk__dec_value() below. + */ + js_ctx->p--; /* backtrack (safe) */ + } else { + /* catches EOF (NUL) and initial comma */ + goto syntax_error; + } + + /* parse value */ + + duk__dec_value(js_ctx); + + /* [ ... arr val ] */ + + duk_xdef_prop_index_wec(thr, -2, arr_idx); + arr_idx++; + } + + /* Must set 'length' explicitly when using duk_xdef_prop_xxx() to + * set the values. + */ + + duk_set_length(thr, -1, arr_idx); + + /* [ ... arr ] */ + + DUK_DDD(DUK_DDDPRINT("parse_array: final array is %!T", + (duk_tval *) duk_get_tval(thr, -1))); + + duk__dec_objarr_exit(js_ctx); + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} + +DUK_LOCAL void duk__dec_value(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_uint8_t x; + + x = duk__dec_get_nonwhite(js_ctx); + + DUK_DDD(DUK_DDDPRINT("parse_value: initial x=%ld", (long) x)); + + /* Note: duk__dec_req_stridx() backtracks one char */ + + if (x == DUK_ASC_DOUBLEQUOTE) { + duk__dec_string(js_ctx); + } else if ((x >= DUK_ASC_0 && x <= DUK_ASC_9) || (x == DUK_ASC_MINUS)) { +#if defined(DUK_USE_JX) + if (js_ctx->flag_ext_custom && x == DUK_ASC_MINUS && duk__dec_peek(js_ctx) == DUK_ASC_UC_I) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_MINUS_INFINITY); /* "-Infinity", '-' has been eaten */ + duk_push_number(thr, -DUK_DOUBLE_INFINITY); + } else { +#else + { /* unconditional block */ +#endif + /* We already ate 'x', so backup one byte. */ + js_ctx->p--; /* safe */ + duk__dec_number(js_ctx); + } + } else if (x == DUK_ASC_LC_T) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_TRUE); + duk_push_true(thr); + } else if (x == DUK_ASC_LC_F) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_FALSE); + duk_push_false(thr); + } else if (x == DUK_ASC_LC_N) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_LC_NULL); + duk_push_null(thr); +#if defined(DUK_USE_JX) + } else if (js_ctx->flag_ext_custom && x == DUK_ASC_LC_U) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_LC_UNDEFINED); + duk_push_undefined(thr); + } else if (js_ctx->flag_ext_custom && x == DUK_ASC_UC_N) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_NAN); + duk_push_nan(thr); + } else if (js_ctx->flag_ext_custom && x == DUK_ASC_UC_I) { + duk__dec_req_stridx(js_ctx, DUK_STRIDX_INFINITY); + duk_push_number(thr, DUK_DOUBLE_INFINITY); + } else if (js_ctx->flag_ext_custom && x == DUK_ASC_LPAREN) { + duk__dec_pointer(js_ctx); + } else if (js_ctx->flag_ext_custom && x == DUK_ASC_PIPE) { + duk__dec_buffer(js_ctx); +#endif + } else if (x == DUK_ASC_LCURLY) { + duk__dec_object(js_ctx); + } else if (x == DUK_ASC_LBRACKET) { + duk__dec_array(js_ctx); + } else { + /* catches EOF (NUL) */ + goto syntax_error; + } + + duk__dec_eat_white(js_ctx); + + /* [ ... val ] */ + return; + + syntax_error: + duk__dec_syntax_error(js_ctx); + DUK_UNREACHABLE(); +} + +/* Recursive value reviver, implements the Walk() algorithm. No C recursion + * check is done here because the initial parsing step will already ensure + * there is a reasonable limit on C recursion depth and hence object depth. + */ +DUK_LOCAL void duk__dec_reviver_walk(duk_json_dec_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_hobject *h; + duk_uarridx_t i, arr_len; + + DUK_DDD(DUK_DDDPRINT("walk: top=%ld, holder=%!T, name=%!T", + (long) duk_get_top(thr), + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + + duk_dup_top(thr); + duk_get_prop(thr, -3); /* -> [ ... holder name val ] */ + + h = duk_get_hobject(thr, -1); + if (h != NULL) { + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_ARRAY) { + arr_len = (duk_uarridx_t) duk_get_length(thr, -1); + for (i = 0; i < arr_len; i++) { + /* [ ... holder name val ] */ + + DUK_DDD(DUK_DDDPRINT("walk: array, top=%ld, i=%ld, arr_len=%ld, holder=%!T, name=%!T, val=%!T", + (long) duk_get_top(thr), (long) i, (long) arr_len, + (duk_tval *) duk_get_tval(thr, -3), (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + + duk_dup_top(thr); + (void) duk_push_uint_to_hstring(thr, (duk_uint_t) i); /* -> [ ... holder name val val ToString(i) ] */ + duk__dec_reviver_walk(js_ctx); /* -> [ ... holder name val new_elem ] */ + + if (duk_is_undefined(thr, -1)) { + duk_pop(thr); + duk_del_prop_index(thr, -1, i); + } else { + /* XXX: duk_xdef_prop_index_wec() would be more appropriate + * here but it currently makes some assumptions that might + * not hold (e.g. that previous property is not an accessor). + */ + duk_put_prop_index(thr, -2, i); + } + } + } else { + /* [ ... holder name val ] */ + duk_enum(thr, -1, DUK_ENUM_OWN_PROPERTIES_ONLY /*flags*/); + while (duk_next(thr, -1 /*enum_index*/, 0 /*get_value*/)) { + DUK_DDD(DUK_DDDPRINT("walk: object, top=%ld, holder=%!T, name=%!T, val=%!T, enum=%!iT, obj_key=%!T", + (long) duk_get_top(thr), (duk_tval *) duk_get_tval(thr, -5), + (duk_tval *) duk_get_tval(thr, -4), (duk_tval *) duk_get_tval(thr, -3), + (duk_tval *) duk_get_tval(thr, -2), (duk_tval *) duk_get_tval(thr, -1))); + + /* [ ... holder name val enum obj_key ] */ + duk_dup_m3(thr); + duk_dup_m2(thr); + + /* [ ... holder name val enum obj_key val obj_key ] */ + duk__dec_reviver_walk(js_ctx); + + /* [ ... holder name val enum obj_key new_elem ] */ + if (duk_is_undefined(thr, -1)) { + duk_pop(thr); + duk_del_prop(thr, -3); + } else { + /* XXX: duk_xdef_prop_index_wec() would be more appropriate + * here but it currently makes some assumptions that might + * not hold (e.g. that previous property is not an accessor). + * + * Using duk_put_prop() works incorrectly with '__proto__' + * if the own property with that name has been deleted. This + * does not happen normally, but a clever reviver can trigger + * that, see complex reviver case in: test-bug-json-parse-__proto__.js. + */ + duk_put_prop(thr, -4); + } + } + duk_pop(thr); /* pop enum */ + } + } + + /* [ ... holder name val ] */ + + duk_dup(thr, js_ctx->idx_reviver); + duk_insert(thr, -4); /* -> [ ... reviver holder name val ] */ + duk_call_method(thr, 2); /* -> [ ... res ] */ + + DUK_DDD(DUK_DDDPRINT("walk: top=%ld, result=%!T", + (long) duk_get_top(thr), (duk_tval *) duk_get_tval(thr, -1))); +} + +/* + * Stringify implementation. + */ + +#define DUK__EMIT_1(js_ctx,ch) duk__emit_1((js_ctx), (duk_uint_fast8_t) (ch)) +#define DUK__EMIT_2(js_ctx,ch1,ch2) duk__emit_2((js_ctx), (duk_uint_fast8_t) (ch1), (duk_uint_fast8_t) (ch2)) +#define DUK__EMIT_HSTR(js_ctx,h) duk__emit_hstring((js_ctx), (h)) +#if defined(DUK_USE_FASTINT) || defined(DUK_USE_JX) || defined(DUK_USE_JC) +#define DUK__EMIT_CSTR(js_ctx,p) duk__emit_cstring((js_ctx), (p)) +#endif +#define DUK__EMIT_STRIDX(js_ctx,i) duk__emit_stridx((js_ctx), (i)) +#define DUK__UNEMIT_1(js_ctx) duk__unemit_1((js_ctx)) + +DUK_LOCAL void duk__emit_1(duk_json_enc_ctx *js_ctx, duk_uint_fast8_t ch) { + DUK_BW_WRITE_ENSURE_U8(js_ctx->thr, &js_ctx->bw, ch); +} + +DUK_LOCAL void duk__emit_2(duk_json_enc_ctx *js_ctx, duk_uint_fast8_t ch1, duk_uint_fast8_t ch2) { + DUK_BW_WRITE_ENSURE_U8_2(js_ctx->thr, &js_ctx->bw, ch1, ch2); +} + +DUK_LOCAL void duk__emit_hstring(duk_json_enc_ctx *js_ctx, duk_hstring *h) { + DUK_BW_WRITE_ENSURE_HSTRING(js_ctx->thr, &js_ctx->bw, h); +} + +#if defined(DUK_USE_FASTINT) || defined(DUK_USE_JX) || defined(DUK_USE_JC) +DUK_LOCAL void duk__emit_cstring(duk_json_enc_ctx *js_ctx, const char *str) { + DUK_BW_WRITE_ENSURE_CSTRING(js_ctx->thr, &js_ctx->bw, str); +} +#endif + +DUK_LOCAL void duk__emit_stridx(duk_json_enc_ctx *js_ctx, duk_small_uint_t stridx) { + duk_hstring *h; + + DUK_ASSERT_STRIDX_VALID(stridx); + h = DUK_HTHREAD_GET_STRING(js_ctx->thr, stridx); + DUK_ASSERT(h != NULL); + + DUK_BW_WRITE_ENSURE_HSTRING(js_ctx->thr, &js_ctx->bw, h); +} + +DUK_LOCAL void duk__unemit_1(duk_json_enc_ctx *js_ctx) { + DUK_ASSERT(DUK_BW_GET_SIZE(js_ctx->thr, &js_ctx->bw) >= 1); + DUK_BW_ADD_PTR(js_ctx->thr, &js_ctx->bw, -1); +} + +#define DUK__MKESC(nybbles,esc1,esc2) \ + (((duk_uint_fast32_t) (nybbles)) << 16) | \ + (((duk_uint_fast32_t) (esc1)) << 8) | \ + ((duk_uint_fast32_t) (esc2)) + +DUK_LOCAL duk_uint8_t *duk__emit_esc_auto_fast(duk_json_enc_ctx *js_ctx, duk_uint_fast32_t cp, duk_uint8_t *q) { + duk_uint_fast32_t tmp; + duk_small_uint_t dig; + + DUK_UNREF(js_ctx); + + /* Caller ensures space for at least DUK__JSON_MAX_ESC_LEN. */ + + /* Select appropriate escape format automatically, and set 'tmp' to a + * value encoding both the escape format character and the nybble count: + * + * (nybble_count << 16) | (escape_char1) | (escape_char2) + */ + +#if defined(DUK_USE_JX) + if (DUK_LIKELY(cp < 0x100UL)) { + if (DUK_UNLIKELY(js_ctx->flag_ext_custom != 0U)) { + tmp = DUK__MKESC(2, DUK_ASC_BACKSLASH, DUK_ASC_LC_X); + } else { + tmp = DUK__MKESC(4, DUK_ASC_BACKSLASH, DUK_ASC_LC_U); + } + } else +#endif + if (DUK_LIKELY(cp < 0x10000UL)) { + tmp = DUK__MKESC(4, DUK_ASC_BACKSLASH, DUK_ASC_LC_U); + } else { +#if defined(DUK_USE_JX) + if (DUK_LIKELY(js_ctx->flag_ext_custom != 0U)) { + tmp = DUK__MKESC(8, DUK_ASC_BACKSLASH, DUK_ASC_UC_U); + } else +#endif + { + /* In compatible mode and standard JSON mode, output + * something useful for non-BMP characters. This won't + * roundtrip but will still be more or less readable and + * more useful than an error. + */ + tmp = DUK__MKESC(8, DUK_ASC_UC_U, DUK_ASC_PLUS); + } + } + + *q++ = (duk_uint8_t) ((tmp >> 8) & 0xff); + *q++ = (duk_uint8_t) (tmp & 0xff); + + tmp = tmp >> 16; + while (tmp > 0) { + tmp--; + dig = (duk_small_uint_t) ((cp >> (4 * tmp)) & 0x0f); + *q++ = duk_lc_digits[dig]; + } + + return q; +} + +DUK_LOCAL void duk__enc_key_autoquote(duk_json_enc_ctx *js_ctx, duk_hstring *k) { + const duk_int8_t *p, *p_start, *p_end; /* Note: intentionally signed. */ + duk_size_t k_len; + duk_codepoint_t cp; + + DUK_ASSERT(k != NULL); + + /* Accept ASCII strings which conform to identifier requirements + * as being emitted without key quotes. Since we only accept ASCII + * there's no need for actual decoding: 'p' is intentionally signed + * so that bytes >= 0x80 extend to negative values and are rejected + * as invalid identifier codepoints. + */ + + if (js_ctx->flag_avoid_key_quotes) { + k_len = DUK_HSTRING_GET_BYTELEN(k); + p_start = (const duk_int8_t *) DUK_HSTRING_GET_DATA(k); + p_end = p_start + k_len; + p = p_start; + + if (p == p_end) { + /* Zero length string is not accepted without quotes */ + goto quote_normally; + } + cp = (duk_codepoint_t) (*p++); + if (DUK_UNLIKELY(!duk_unicode_is_identifier_start(cp))) { + goto quote_normally; + } + while (p < p_end) { + cp = (duk_codepoint_t) (*p++); + if (DUK_UNLIKELY(!duk_unicode_is_identifier_part(cp))) { + goto quote_normally; + } + } + + /* This seems faster than emitting bytes one at a time and + * then potentially rewinding. + */ + DUK__EMIT_HSTR(js_ctx, k); + return; + } + + quote_normally: + duk__enc_quote_string(js_ctx, k); +} + +/* The Quote(value) operation: quote a string. + * + * Stack policy: [ ] -> [ ]. + */ + +DUK_LOCAL void duk__enc_quote_string(duk_json_enc_ctx *js_ctx, duk_hstring *h_str) { + duk_hthread *thr = js_ctx->thr; + const duk_uint8_t *p, *p_start, *p_end, *p_now, *p_tmp; + duk_uint8_t *q; + duk_ucodepoint_t cp; /* typed for duk_unicode_decode_xutf8() */ + + DUK_DDD(DUK_DDDPRINT("duk__enc_quote_string: h_str=%!O", (duk_heaphdr *) h_str)); + + DUK_ASSERT(h_str != NULL); + p_start = DUK_HSTRING_GET_DATA(h_str); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_str); + p = p_start; + + DUK__EMIT_1(js_ctx, DUK_ASC_DOUBLEQUOTE); + + /* Encode string in small chunks, estimating the maximum expansion so that + * there's no need to ensure space while processing the chunk. + */ + + while (p < p_end) { + duk_size_t left, now, space; + + left = (duk_size_t) (p_end - p); + now = (left > DUK__JSON_ENCSTR_CHUNKSIZE ? + DUK__JSON_ENCSTR_CHUNKSIZE : left); + + /* Maximum expansion per input byte is 6: + * - invalid UTF-8 byte causes "\uXXXX" to be emitted (6/1 = 6). + * - 2-byte UTF-8 encodes as "\uXXXX" (6/2 = 3). + * - 4-byte UTF-8 encodes as "\Uxxxxxxxx" (10/4 = 2.5). + */ + space = now * 6; + q = DUK_BW_ENSURE_GETPTR(thr, &js_ctx->bw, space); + + p_now = p + now; + + while (p < p_now) { +#if defined(DUK_USE_JSON_QUOTESTRING_FASTPATH) + duk_uint8_t b; + + b = duk__json_quotestr_lookup[*p++]; + if (DUK_LIKELY(b < 0x80)) { + /* Most input bytes go through here. */ + *q++ = b; + } else if (b >= 0xa0) { + *q++ = DUK_ASC_BACKSLASH; + *q++ = (duk_uint8_t) (b - 0x80); + } else if (b == 0x80) { + cp = (duk_ucodepoint_t) (*(p - 1)); + q = duk__emit_esc_auto_fast(js_ctx, cp, q); + } else if (b == 0x7f && js_ctx->flag_ascii_only) { + /* 0x7F is special */ + DUK_ASSERT(b == 0x81); + cp = (duk_ucodepoint_t) 0x7f; + q = duk__emit_esc_auto_fast(js_ctx, cp, q); + } else { + DUK_ASSERT(b == 0x81); + p--; + + /* slow path is shared */ +#else /* DUK_USE_JSON_QUOTESTRING_FASTPATH */ + cp = *p; + + if (DUK_LIKELY(cp <= 0x7f)) { + /* ascii fast path: avoid decoding utf-8 */ + p++; + if (cp == 0x22 || cp == 0x5c) { + /* double quote or backslash */ + *q++ = DUK_ASC_BACKSLASH; + *q++ = (duk_uint8_t) cp; + } else if (cp < 0x20) { + duk_uint_fast8_t esc_char; + + /* This approach is a bit shorter than a straight + * if-else-ladder and also a bit faster. + */ + if (cp < (sizeof(duk__json_quotestr_esc) / sizeof(duk_uint8_t)) && + (esc_char = duk__json_quotestr_esc[cp]) != 0) { + *q++ = DUK_ASC_BACKSLASH; + *q++ = (duk_uint8_t) esc_char; + } else { + q = duk__emit_esc_auto_fast(js_ctx, cp, q); + } + } else if (cp == 0x7f && js_ctx->flag_ascii_only) { + q = duk__emit_esc_auto_fast(js_ctx, cp, q); + } else { + /* any other printable -> as is */ + *q++ = (duk_uint8_t) cp; + } + } else { + /* slow path is shared */ +#endif /* DUK_USE_JSON_QUOTESTRING_FASTPATH */ + + /* slow path decode */ + + /* If XUTF-8 decoding fails, treat the offending byte as a codepoint directly + * and go forward one byte. This is of course very lossy, but allows some kind + * of output to be produced even for internal strings which don't conform to + * XUTF-8. All standard ECMAScript strings are always CESU-8, so this behavior + * does not violate the ECMAScript specification. The behavior is applied to + * all modes, including ECMAScript standard JSON. Because the current XUTF-8 + * decoding is not very strict, this behavior only really affects initial bytes + * and truncated codepoints. + * + * Another alternative would be to scan forwards to start of next codepoint + * (or end of input) and emit just one replacement codepoint. + */ + + p_tmp = p; + if (!duk_unicode_decode_xutf8(thr, &p, p_start, p_end, &cp)) { + /* Decode failed. */ + cp = *p_tmp; + p = p_tmp + 1; + } + +#if defined(DUK_USE_NONSTD_JSON_ESC_U2028_U2029) + if (js_ctx->flag_ascii_only || cp == 0x2028 || cp == 0x2029) { +#else + if (js_ctx->flag_ascii_only) { +#endif + q = duk__emit_esc_auto_fast(js_ctx, cp, q); + } else { + /* as is */ + DUK_RAW_WRITE_XUTF8(q, cp); + } + } + } + + DUK_BW_SET_PTR(thr, &js_ctx->bw, q); + } + + DUK__EMIT_1(js_ctx, DUK_ASC_DOUBLEQUOTE); +} + +/* Encode a double (checked by caller) from stack top. Stack top may be + * replaced by serialized string but is not popped (caller does that). + */ +DUK_LOCAL void duk__enc_double(duk_json_enc_ctx *js_ctx) { + duk_hthread *thr; + duk_tval *tv; + duk_double_t d; + duk_small_int_t c; + duk_small_int_t s; + duk_small_uint_t stridx; + duk_small_uint_t n2s_flags; + duk_hstring *h_str; + + DUK_ASSERT(js_ctx != NULL); + thr = js_ctx->thr; + DUK_ASSERT(thr != NULL); + + /* Caller must ensure 'tv' is indeed a double and not a fastint! */ + tv = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(DUK_TVAL_IS_DOUBLE(tv)); + d = DUK_TVAL_GET_DOUBLE(tv); + + c = (duk_small_int_t) DUK_FPCLASSIFY(d); + s = (duk_small_int_t) DUK_SIGNBIT(d); + DUK_UNREF(s); + + if (DUK_LIKELY(!(c == DUK_FP_INFINITE || c == DUK_FP_NAN))) { + DUK_ASSERT(DUK_ISFINITE(d)); + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + /* Negative zero needs special handling in JX/JC because + * it would otherwise serialize to '0', not '-0'. + */ + if (DUK_UNLIKELY(c == DUK_FP_ZERO && s != 0 && + (js_ctx->flag_ext_custom_or_compatible))) { + duk_push_hstring_stridx(thr, DUK_STRIDX_MINUS_ZERO); /* '-0' */ + } else +#endif /* DUK_USE_JX || DUK_USE_JC */ + { + n2s_flags = 0; + /* [ ... number ] -> [ ... string ] */ + duk_numconv_stringify(thr, 10 /*radix*/, 0 /*digits*/, n2s_flags); + } + h_str = duk_known_hstring(thr, -1); + DUK__EMIT_HSTR(js_ctx, h_str); + return; + } + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (!(js_ctx->flags & (DUK_JSON_FLAG_EXT_CUSTOM | + DUK_JSON_FLAG_EXT_COMPATIBLE))) { + stridx = DUK_STRIDX_LC_NULL; + } else if (c == DUK_FP_NAN) { + stridx = js_ctx->stridx_custom_nan; + } else if (s == 0) { + stridx = js_ctx->stridx_custom_posinf; + } else { + stridx = js_ctx->stridx_custom_neginf; + } +#else + stridx = DUK_STRIDX_LC_NULL; +#endif + DUK__EMIT_STRIDX(js_ctx, stridx); +} + +#if defined(DUK_USE_FASTINT) +/* Encode a fastint from duk_tval ptr, no value stack effects. */ +DUK_LOCAL void duk__enc_fastint_tval(duk_json_enc_ctx *js_ctx, duk_tval *tv) { + duk_int64_t v; + + /* Fastint range is signed 48-bit so longest value is -2^47 = -140737488355328 + * (16 chars long), longest signed 64-bit value is -2^63 = -9223372036854775808 + * (20 chars long). Alloc space for 64-bit range to be safe. + */ + duk_uint8_t buf[20 + 1]; + + /* Caller must ensure 'tv' is indeed a fastint! */ + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv)); + v = DUK_TVAL_GET_FASTINT(tv); + + /* XXX: There are no format strings in duk_config.h yet, could add + * one for formatting duk_int64_t. For now, assumes "%lld" and that + * "long long" type exists. Could also rely on C99 directly but that + * won't work for older MSVC. + */ + DUK_SPRINTF((char *) buf, "%lld", (long long) v); + DUK__EMIT_CSTR(js_ctx, (const char *) buf); +} +#endif + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) +#if defined(DUK_USE_HEX_FASTPATH) +DUK_LOCAL duk_uint8_t *duk__enc_buffer_data_hex(const duk_uint8_t *src, duk_size_t src_len, duk_uint8_t *dst) { + duk_uint8_t *q; + duk_uint16_t *q16; + duk_small_uint_t x; + duk_size_t i, len_safe; +#if !defined(DUK_USE_UNALIGNED_ACCESSES_POSSIBLE) + duk_bool_t shift_dst; +#endif + + /* Unlike in duk_hex_encode() 'dst' is not necessarily aligned by 2. + * For platforms where unaligned accesses are not allowed, shift 'dst' + * ahead by 1 byte to get alignment and then duk_memmove() the result + * in place. The faster encoding loop makes up the difference. + * There's always space for one extra byte because a terminator always + * follows the hex data and that's been accounted for by the caller. + */ + +#if defined(DUK_USE_UNALIGNED_ACCESSES_POSSIBLE) + q16 = (duk_uint16_t *) (void *) dst; +#else + shift_dst = (duk_bool_t) (((duk_size_t) dst) & 0x01U); + if (shift_dst) { + DUK_DD(DUK_DDPRINT("unaligned accesses not possible, dst not aligned -> step to dst + 1")); + q16 = (duk_uint16_t *) (void *) (dst + 1); + } else { + DUK_DD(DUK_DDPRINT("unaligned accesses not possible, dst is aligned")); + q16 = (duk_uint16_t *) (void *) dst; + } + DUK_ASSERT((((duk_size_t) q16) & 0x01U) == 0); +#endif + + len_safe = src_len & ~0x03U; + for (i = 0; i < len_safe; i += 4) { + q16[0] = duk_hex_enctab[src[i]]; + q16[1] = duk_hex_enctab[src[i + 1]]; + q16[2] = duk_hex_enctab[src[i + 2]]; + q16[3] = duk_hex_enctab[src[i + 3]]; + q16 += 4; + } + q = (duk_uint8_t *) q16; + +#if !defined(DUK_USE_UNALIGNED_ACCESSES_POSSIBLE) + if (shift_dst) { + q--; + duk_memmove((void *) dst, (const void *) (dst + 1), 2 * len_safe); + DUK_ASSERT(dst + 2 * len_safe == q); + } +#endif + + for (; i < src_len; i++) { + x = src[i]; + *q++ = duk_lc_digits[x >> 4]; + *q++ = duk_lc_digits[x & 0x0f]; + } + + return q; +} +#else /* DUK_USE_HEX_FASTPATH */ +DUK_LOCAL duk_uint8_t *duk__enc_buffer_data_hex(const duk_uint8_t *src, duk_size_t src_len, duk_uint8_t *dst) { + const duk_uint8_t *p; + const duk_uint8_t *p_end; + duk_uint8_t *q; + duk_small_uint_t x; + + p = src; + p_end = src + src_len; + q = dst; + while (p != p_end) { + x = *p++; + *q++ = duk_lc_digits[x >> 4]; + *q++ = duk_lc_digits[x & 0x0f]; + } + + return q; +} +#endif /* DUK_USE_HEX_FASTPATH */ + +DUK_LOCAL void duk__enc_buffer_data(duk_json_enc_ctx *js_ctx, duk_uint8_t *buf_data, duk_size_t buf_len) { + duk_hthread *thr; + duk_uint8_t *q; + duk_size_t space; + + thr = js_ctx->thr; + + DUK_ASSERT(js_ctx->flag_ext_custom || js_ctx->flag_ext_compatible); /* caller checks */ + DUK_ASSERT(js_ctx->flag_ext_custom_or_compatible); + + /* Buffer values are encoded in (lowercase) hex to make the + * binary data readable. Base64 or similar would be more + * compact but less readable, and the point of JX/JC + * variants is to be as useful to a programmer as possible. + */ + + /* The #if defined() clutter here needs to handle the three + * cases: (1) JX+JC, (2) JX only, (3) JC only. + */ + + /* Note: space must cater for both JX and JC. */ + space = 9 + buf_len * 2 + 2; + DUK_ASSERT(DUK_HBUFFER_MAX_BYTELEN <= 0x7ffffffeUL); + DUK_ASSERT((space - 2) / 2 >= buf_len); /* overflow not possible, buffer limits */ + q = DUK_BW_ENSURE_GETPTR(thr, &js_ctx->bw, space); + +#if defined(DUK_USE_JX) && defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom) +#endif +#if defined(DUK_USE_JX) + { + *q++ = DUK_ASC_PIPE; + q = duk__enc_buffer_data_hex(buf_data, buf_len, q); + *q++ = DUK_ASC_PIPE; + + } +#endif +#if defined(DUK_USE_JX) && defined(DUK_USE_JC) + else +#endif +#if defined(DUK_USE_JC) + { + DUK_ASSERT(js_ctx->flag_ext_compatible); + duk_memcpy((void *) q, (const void *) "{\"_buf\":\"", 9); /* len: 9 */ + q += 9; + q = duk__enc_buffer_data_hex(buf_data, buf_len, q); + *q++ = DUK_ASC_DOUBLEQUOTE; + *q++ = DUK_ASC_RCURLY; + } +#endif + + DUK_BW_SET_PTR(thr, &js_ctx->bw, q); +} + +DUK_LOCAL void duk__enc_buffer_jx_jc(duk_json_enc_ctx *js_ctx, duk_hbuffer *h) { + duk__enc_buffer_data(js_ctx, + (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(js_ctx->thr->heap, h), + (duk_size_t) DUK_HBUFFER_GET_SIZE(h)); +} +#endif /* DUK_USE_JX || DUK_USE_JC */ + +#if defined(DUK_USE_JSON_STRINGIFY_FASTPATH) +DUK_LOCAL void duk__enc_buffer_json_fastpath(duk_json_enc_ctx *js_ctx, duk_hbuffer *h) { + duk_size_t i, n; + const duk_uint8_t *buf; + duk_uint8_t *q; + + n = DUK_HBUFFER_GET_SIZE(h); + if (n == 0) { + DUK__EMIT_2(js_ctx, DUK_ASC_LCURLY, DUK_ASC_RCURLY); + return; + } + + DUK__EMIT_1(js_ctx, DUK_ASC_LCURLY); + + /* Maximum encoded length with 32-bit index: 1 + 10 + 2 + 3 + 1 + 1 = 18, + * with 64-bit index: 1 + 20 + 2 + 3 + 1 + 1 = 28. 32 has some slack. + * + * Note that because the output buffer is reallocated from time to time, + * side effects (such as finalizers) affecting the buffer 'h' must be + * disabled. This is the case in the JSON.stringify() fast path. + */ + + buf = (const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(js_ctx->thr->heap, h); + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + for (i = 0; i < n; i++) { + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth + 1); + q = DUK_BW_ENSURE_GETPTR(js_ctx->thr, &js_ctx->bw, 32); + q += DUK_SPRINTF((char *) q, "\"%lu\": %u,", (unsigned long) i, (unsigned int) buf[i]); + DUK_BW_SET_PTR(js_ctx->thr, &js_ctx->bw, q); + } + } else { + q = DUK_BW_GET_PTR(js_ctx->thr, &js_ctx->bw); + for (i = 0; i < n; i++) { + q = DUK_BW_ENSURE_RAW(js_ctx->thr, &js_ctx->bw, 32, q); + q += DUK_SPRINTF((char *) q, "\"%lu\":%u,", (unsigned long) i, (unsigned int) buf[i]); + } + DUK_BW_SET_PTR(js_ctx->thr, &js_ctx->bw, q); + } + DUK__UNEMIT_1(js_ctx); /* eat trailing comma */ + + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth); + } + DUK__EMIT_1(js_ctx, DUK_ASC_RCURLY); +} +#endif /* DUK_USE_JSON_STRINGIFY_FASTPATH */ + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) +DUK_LOCAL void duk__enc_pointer(duk_json_enc_ctx *js_ctx, void *ptr) { + char buf[64]; /* XXX: how to figure correct size? */ + const char *fmt; + + DUK_ASSERT(js_ctx->flag_ext_custom || js_ctx->flag_ext_compatible); /* caller checks */ + DUK_ASSERT(js_ctx->flag_ext_custom_or_compatible); + + duk_memzero(buf, sizeof(buf)); + + /* The #if defined() clutter here needs to handle the three + * cases: (1) JX+JC, (2) JX only, (3) JC only. + */ +#if defined(DUK_USE_JX) && defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom) +#endif +#if defined(DUK_USE_JX) + { + fmt = ptr ? "(%p)" : "(null)"; + } +#endif +#if defined(DUK_USE_JX) && defined(DUK_USE_JC) + else +#endif +#if defined(DUK_USE_JC) + { + DUK_ASSERT(js_ctx->flag_ext_compatible); + fmt = ptr ? "{\"_ptr\":\"%p\"}" : "{\"_ptr\":\"null\"}"; + } +#endif + + /* When ptr == NULL, the format argument is unused. */ + DUK_SNPRINTF(buf, sizeof(buf) - 1, fmt, ptr); /* must not truncate */ + DUK__EMIT_CSTR(js_ctx, buf); +} +#endif /* DUK_USE_JX || DUK_USE_JC */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) +DUK_LOCAL void duk__enc_bufobj(duk_json_enc_ctx *js_ctx, duk_hbufobj *h_bufobj) { + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + if (h_bufobj->buf == NULL || !DUK_HBUFOBJ_VALID_SLICE(h_bufobj)) { + DUK__EMIT_STRIDX(js_ctx, DUK_STRIDX_LC_NULL); + } else { + /* Handle both full and partial slice (as long as covered). */ + duk__enc_buffer_data(js_ctx, + (duk_uint8_t *) DUK_HBUFOBJ_GET_SLICE_BASE(js_ctx->thr->heap, h_bufobj), + (duk_size_t) h_bufobj->length); + } +} +#endif /* DUK_USE_JX || DUK_USE_JC */ +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* Indent helper. Calling code relies on js_ctx->recursion_depth also being + * directly related to indent depth. + */ +#if defined(DUK_USE_PREFER_SIZE) +DUK_LOCAL void duk__enc_newline_indent(duk_json_enc_ctx *js_ctx, duk_uint_t depth) { + DUK_ASSERT(js_ctx->h_gap != NULL); + DUK_ASSERT(DUK_HSTRING_GET_BYTELEN(js_ctx->h_gap) > 0); /* caller guarantees */ + + DUK__EMIT_1(js_ctx, 0x0a); + while (depth-- > 0) { + DUK__EMIT_HSTR(js_ctx, js_ctx->h_gap); + } +} +#else /* DUK_USE_PREFER_SIZE */ +DUK_LOCAL void duk__enc_newline_indent(duk_json_enc_ctx *js_ctx, duk_uint_t depth) { + const duk_uint8_t *gap_data; + duk_size_t gap_len; + duk_size_t avail_bytes; /* bytes of indent available for copying */ + duk_size_t need_bytes; /* bytes of indent still needed */ + duk_uint8_t *p_start; + duk_uint8_t *p; + + DUK_ASSERT(js_ctx->h_gap != NULL); + DUK_ASSERT(DUK_HSTRING_GET_BYTELEN(js_ctx->h_gap) > 0); /* caller guarantees */ + + DUK__EMIT_1(js_ctx, 0x0a); + if (DUK_UNLIKELY(depth == 0)) { + return; + } + + /* To handle deeper indents efficiently, make use of copies we've + * already emitted. In effect we can emit a sequence of 1, 2, 4, + * 8, etc copies, and then finish the last run. Byte counters + * avoid multiply with gap_len on every loop. + */ + + gap_data = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(js_ctx->h_gap); + gap_len = (duk_size_t) DUK_HSTRING_GET_BYTELEN(js_ctx->h_gap); + DUK_ASSERT(gap_len > 0); + + need_bytes = gap_len * depth; + p = DUK_BW_ENSURE_GETPTR(js_ctx->thr, &js_ctx->bw, need_bytes); + p_start = p; + + duk_memcpy((void *) p, (const void *) gap_data, (size_t) gap_len); + p += gap_len; + avail_bytes = gap_len; + DUK_ASSERT(need_bytes >= gap_len); + need_bytes -= gap_len; + + while (need_bytes >= avail_bytes) { + duk_memcpy((void *) p, (const void *) p_start, (size_t) avail_bytes); + p += avail_bytes; + need_bytes -= avail_bytes; + avail_bytes <<= 1; + } + + DUK_ASSERT(need_bytes < avail_bytes); /* need_bytes may be zero */ + duk_memcpy((void *) p, (const void *) p_start, (size_t) need_bytes); + p += need_bytes; + /*avail_bytes += need_bytes*/ + + DUK_BW_SET_PTR(js_ctx->thr, &js_ctx->bw, p); +} +#endif /* DUK_USE_PREFER_SIZE */ + +/* Shared entry handling for object/array serialization. */ +DUK_LOCAL void duk__enc_objarr_entry(duk_json_enc_ctx *js_ctx, duk_idx_t *entry_top) { + duk_hthread *thr = js_ctx->thr; + duk_hobject *h_target; + duk_uint_fast32_t i, n; + + *entry_top = duk_get_top(thr); + + duk_require_stack(thr, DUK_JSON_ENC_REQSTACK); + + /* Loop check using a hybrid approach: a fixed-size visited[] array + * with overflow in a loop check object. + */ + + h_target = duk_known_hobject(thr, -1); /* object or array */ + + n = js_ctx->recursion_depth; + if (DUK_UNLIKELY(n > DUK_JSON_ENC_LOOPARRAY)) { + n = DUK_JSON_ENC_LOOPARRAY; + } + for (i = 0; i < n; i++) { + if (DUK_UNLIKELY(js_ctx->visiting[i] == h_target)) { + DUK_DD(DUK_DDPRINT("slow path loop detect")); + DUK_ERROR_TYPE(thr, DUK_STR_CYCLIC_INPUT); + DUK_WO_NORETURN(return;); + } + } + if (js_ctx->recursion_depth < DUK_JSON_ENC_LOOPARRAY) { + js_ctx->visiting[js_ctx->recursion_depth] = h_target; + } else { + duk_push_sprintf(thr, DUK_STR_FMT_PTR, (void *) h_target); + duk_dup_top(thr); /* -> [ ... voidp voidp ] */ + if (duk_has_prop(thr, js_ctx->idx_loop)) { + DUK_ERROR_TYPE(thr, DUK_STR_CYCLIC_INPUT); + DUK_WO_NORETURN(return;); + } + duk_push_true(thr); /* -> [ ... voidp true ] */ + duk_put_prop(thr, js_ctx->idx_loop); /* -> [ ... ] */ + } + + /* C recursion check. */ + + DUK_ASSERT_DISABLE(js_ctx->recursion_depth >= 0); /* unsigned */ + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + if (js_ctx->recursion_depth >= js_ctx->recursion_limit) { + DUK_ERROR_RANGE(thr, DUK_STR_JSONENC_RECLIMIT); + DUK_WO_NORETURN(return;); + } + js_ctx->recursion_depth++; + + DUK_DDD(DUK_DDDPRINT("shared entry finished: top=%ld, loop=%!T", + (long) duk_get_top(thr), (duk_tval *) duk_get_tval(thr, js_ctx->idx_loop))); +} + +/* Shared exit handling for object/array serialization. */ +DUK_LOCAL void duk__enc_objarr_exit(duk_json_enc_ctx *js_ctx, duk_idx_t *entry_top) { + duk_hthread *thr = js_ctx->thr; + duk_hobject *h_target; + + /* C recursion check. */ + + DUK_ASSERT(js_ctx->recursion_depth > 0); + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + js_ctx->recursion_depth--; + + /* Loop check. */ + + h_target = duk_known_hobject(thr, *entry_top - 1); /* original target at entry_top - 1 */ + + if (js_ctx->recursion_depth < DUK_JSON_ENC_LOOPARRAY) { + /* Previous entry was inside visited[], nothing to do. */ + } else { + duk_push_sprintf(thr, DUK_STR_FMT_PTR, (void *) h_target); + duk_del_prop(thr, js_ctx->idx_loop); /* -> [ ... ] */ + } + + /* Restore stack top after unbalanced code paths. */ + duk_set_top(thr, *entry_top); + + DUK_DDD(DUK_DDDPRINT("shared entry finished: top=%ld, loop=%!T", + (long) duk_get_top(thr), (duk_tval *) duk_get_tval(thr, js_ctx->idx_loop))); +} + +/* The JO(value) operation: encode object. + * + * Stack policy: [ object ] -> [ object ]. + */ +DUK_LOCAL void duk__enc_object(duk_json_enc_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_hstring *h_key; + duk_idx_t entry_top; + duk_idx_t idx_obj; + duk_idx_t idx_keys; + duk_bool_t emitted; + duk_uarridx_t arr_len, i; + duk_size_t prev_size; + + DUK_DDD(DUK_DDDPRINT("duk__enc_object: obj=%!T", (duk_tval *) duk_get_tval(thr, -1))); + + duk__enc_objarr_entry(js_ctx, &entry_top); + + idx_obj = entry_top - 1; + + if (js_ctx->idx_proplist >= 0) { + idx_keys = js_ctx->idx_proplist; + } else { + /* XXX: would be nice to enumerate an object at specified index */ + duk_dup(thr, idx_obj); + (void) duk_hobject_get_enumerated_keys(thr, DUK_ENUM_OWN_PROPERTIES_ONLY /*flags*/); /* [ ... target ] -> [ ... target keys ] */ + idx_keys = duk_require_normalize_index(thr, -1); + /* leave stack unbalanced on purpose */ + } + + DUK_DDD(DUK_DDDPRINT("idx_keys=%ld, h_keys=%!T", + (long) idx_keys, (duk_tval *) duk_get_tval(thr, idx_keys))); + + /* Steps 8-10 have been merged to avoid a "partial" variable. */ + + DUK__EMIT_1(js_ctx, DUK_ASC_LCURLY); + + /* XXX: keys is an internal object with all keys to be processed + * in its (gapless) array part. Because nobody can touch the keys + * object, we could iterate its array part directly (keeping in mind + * that it can be reallocated). + */ + + arr_len = (duk_uarridx_t) duk_get_length(thr, idx_keys); + emitted = 0; + for (i = 0; i < arr_len; i++) { + duk_get_prop_index(thr, idx_keys, i); /* -> [ ... key ] */ + + DUK_DDD(DUK_DDDPRINT("object property loop: holder=%!T, key=%!T", + (duk_tval *) duk_get_tval(thr, idx_obj), + (duk_tval *) duk_get_tval(thr, -1))); + + h_key = duk_known_hstring(thr, -1); + DUK_ASSERT(h_key != NULL); + DUK_ASSERT(!DUK_HSTRING_HAS_SYMBOL(h_key)); /* proplist filtering; enum options */ + + prev_size = DUK_BW_GET_SIZE(js_ctx->thr, &js_ctx->bw); + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth); + duk__enc_key_autoquote(js_ctx, h_key); + DUK__EMIT_2(js_ctx, DUK_ASC_COLON, DUK_ASC_SPACE); + } else { + duk__enc_key_autoquote(js_ctx, h_key); + DUK__EMIT_1(js_ctx, DUK_ASC_COLON); + } + + /* [ ... key ] */ + + if (DUK_UNLIKELY(duk__enc_value(js_ctx, idx_obj) == 0)) { + /* Value would yield 'undefined', so skip key altogether. + * Side effects have already happened. + */ + DUK_BW_SET_SIZE(js_ctx->thr, &js_ctx->bw, prev_size); + } else { + DUK__EMIT_1(js_ctx, DUK_ASC_COMMA); + emitted = 1; + } + + /* [ ... ] */ + } + + if (emitted) { + DUK_ASSERT(*((duk_uint8_t *) DUK_BW_GET_PTR(js_ctx->thr, &js_ctx->bw) - 1) == DUK_ASC_COMMA); + DUK__UNEMIT_1(js_ctx); /* eat trailing comma */ + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + DUK_ASSERT(js_ctx->recursion_depth >= 1); + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth - 1U); + } + } + DUK__EMIT_1(js_ctx, DUK_ASC_RCURLY); + + duk__enc_objarr_exit(js_ctx, &entry_top); + + DUK_ASSERT_TOP(thr, entry_top); +} + +/* The JA(value) operation: encode array. + * + * Stack policy: [ array ] -> [ array ]. + */ +DUK_LOCAL void duk__enc_array(duk_json_enc_ctx *js_ctx) { + duk_hthread *thr = js_ctx->thr; + duk_idx_t entry_top; + duk_idx_t idx_arr; + duk_bool_t emitted; + duk_uarridx_t i, arr_len; + + DUK_DDD(DUK_DDDPRINT("duk__enc_array: array=%!T", + (duk_tval *) duk_get_tval(thr, -1))); + + duk__enc_objarr_entry(js_ctx, &entry_top); + + idx_arr = entry_top - 1; + + /* Steps 8-10 have been merged to avoid a "partial" variable. */ + + DUK__EMIT_1(js_ctx, DUK_ASC_LBRACKET); + + arr_len = (duk_uarridx_t) duk_get_length(thr, idx_arr); + emitted = 0; + for (i = 0; i < arr_len; i++) { + DUK_DDD(DUK_DDDPRINT("array entry loop: array=%!T, index=%ld, arr_len=%ld", + (duk_tval *) duk_get_tval(thr, idx_arr), + (long) i, (long) arr_len)); + + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + DUK_ASSERT(js_ctx->recursion_depth >= 1); + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth); + } + + (void) duk_push_uint_to_hstring(thr, (duk_uint_t) i); /* -> [ ... key ] */ + + /* [ ... key ] */ + + if (DUK_UNLIKELY(duk__enc_value(js_ctx, idx_arr) == 0)) { + /* Value would normally be omitted, replace with 'null'. */ + DUK__EMIT_STRIDX(js_ctx, DUK_STRIDX_LC_NULL); + } else { + ; + } + + /* [ ... ] */ + + DUK__EMIT_1(js_ctx, DUK_ASC_COMMA); + emitted = 1; + } + + if (emitted) { + DUK_ASSERT(*((duk_uint8_t *) DUK_BW_GET_PTR(js_ctx->thr, &js_ctx->bw) - 1) == DUK_ASC_COMMA); + DUK__UNEMIT_1(js_ctx); /* eat trailing comma */ + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + DUK_ASSERT(js_ctx->recursion_depth >= 1); + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth - 1U); + } + } + DUK__EMIT_1(js_ctx, DUK_ASC_RBRACKET); + + duk__enc_objarr_exit(js_ctx, &entry_top); + + DUK_ASSERT_TOP(thr, entry_top); +} + +/* The Str(key, holder) operation. + * + * Stack policy: [ ... key ] -> [ ... ] + */ +DUK_LOCAL duk_bool_t duk__enc_value(duk_json_enc_ctx *js_ctx, duk_idx_t idx_holder) { + duk_hthread *thr = js_ctx->thr; + duk_tval *tv; + duk_tval *tv_holder; + duk_tval *tv_key; + duk_small_int_t c; + + DUK_DDD(DUK_DDDPRINT("duk__enc_value: idx_holder=%ld, holder=%!T, key=%!T", + (long) idx_holder, (duk_tval *) duk_get_tval(thr, idx_holder), + (duk_tval *) duk_get_tval(thr, -1))); + + tv_holder = DUK_GET_TVAL_POSIDX(thr, idx_holder); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv_holder)); + tv_key = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv_key)); + DUK_ASSERT(!DUK_HSTRING_HAS_SYMBOL(DUK_TVAL_GET_STRING(tv_key))); /* Caller responsible. */ + (void) duk_hobject_getprop(thr, tv_holder, tv_key); + + /* -> [ ... key val ] */ + + DUK_DDD(DUK_DDDPRINT("value=%!T", (duk_tval *) duk_get_tval(thr, -1))); + + /* Standard JSON checks for .toJSON() only for actual objects; for + * example, setting Number.prototype.toJSON and then serializing a + * number won't invoke the .toJSON() method. However, lightfuncs and + * plain buffers mimic objects so we check for their .toJSON() method. + */ + if (duk_check_type_mask(thr, -1, DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_LIGHTFUNC | + DUK_TYPE_MASK_BUFFER)) { + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_TO_JSON); + if (duk_is_callable(thr, -1)) { /* toJSON() can also be a lightfunc */ + DUK_DDD(DUK_DDDPRINT("value is object, has callable toJSON() -> call it")); + /* XXX: duk_dup_unvalidated(thr, -2) etc. */ + duk_dup_m2(thr); /* -> [ ... key val toJSON val ] */ + duk_dup_m4(thr); /* -> [ ... key val toJSON val key ] */ + duk_call_method(thr, 1); /* -> [ ... key val val' ] */ + duk_remove_m2(thr); /* -> [ ... key val' ] */ + } else { + duk_pop(thr); /* -> [ ... key val ] */ + } + } + + /* [ ... key val ] */ + + DUK_DDD(DUK_DDDPRINT("value=%!T", (duk_tval *) duk_get_tval(thr, -1))); + + if (js_ctx->h_replacer) { + /* XXX: Here a "slice copy" would be useful. */ + DUK_DDD(DUK_DDDPRINT("replacer is set, call replacer")); + duk_push_hobject(thr, js_ctx->h_replacer); /* -> [ ... key val replacer ] */ + duk_dup(thr, idx_holder); /* -> [ ... key val replacer holder ] */ + duk_dup_m4(thr); /* -> [ ... key val replacer holder key ] */ + duk_dup_m4(thr); /* -> [ ... key val replacer holder key val ] */ + duk_call_method(thr, 2); /* -> [ ... key val val' ] */ + duk_remove_m2(thr); /* -> [ ... key val' ] */ + } + + /* [ ... key val ] */ + + DUK_DDD(DUK_DDDPRINT("value=%!T", (duk_tval *) duk_get_tval(thr, -1))); + + tv = DUK_GET_TVAL_NEGIDX(thr, -1); + if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (DUK_HOBJECT_IS_BUFOBJ(h) && + js_ctx->flags & (DUK_JSON_FLAG_EXT_CUSTOM | DUK_JSON_FLAG_EXT_COMPATIBLE)) { + /* With JX/JC a bufferobject gets serialized specially. */ + duk_hbufobj *h_bufobj; + h_bufobj = (duk_hbufobj *) h; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + duk__enc_bufobj(js_ctx, h_bufobj); + goto pop2_emitted; + } + /* Otherwise bufferobjects get serialized as normal objects. */ +#endif /* JX || JC */ +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + c = (duk_small_int_t) DUK_HOBJECT_GET_CLASS_NUMBER(h); + switch (c) { + case DUK_HOBJECT_CLASS_NUMBER: { + DUK_DDD(DUK_DDDPRINT("value is a Number object -> coerce with ToNumber()")); + duk_to_number_m1(thr); + /* The coercion potentially invokes user .valueOf() and .toString() + * but can't result in a function value because ToPrimitive() would + * reject such a result: test-dev-json-stringify-coercion-1.js. + */ + DUK_ASSERT(!duk_is_callable(thr, -1)); + break; + } + case DUK_HOBJECT_CLASS_STRING: { + DUK_DDD(DUK_DDDPRINT("value is a String object -> coerce with ToString()")); + duk_to_string(thr, -1); + /* Same coercion behavior as for Number. */ + DUK_ASSERT(!duk_is_callable(thr, -1)); + break; + } +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + case DUK_HOBJECT_CLASS_POINTER: +#endif + case DUK_HOBJECT_CLASS_BOOLEAN: { + DUK_DDD(DUK_DDDPRINT("value is a Boolean/Buffer/Pointer object -> get internal value")); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE); + duk_remove_m2(thr); + break; + } + default: { + /* Normal object which doesn't get automatically coerced to a + * primitive value. Functions are checked for specially. The + * primitive value coercions for Number, String, Pointer, and + * Boolean can't result in functions so suffices to check here. + * Symbol objects are handled like plain objects (their primitive + * value is NOT looked up like for e.g. String objects). + */ + DUK_ASSERT(h != NULL); + if (DUK_HOBJECT_IS_CALLABLE(h)) { +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flags & (DUK_JSON_FLAG_EXT_CUSTOM | + DUK_JSON_FLAG_EXT_COMPATIBLE)) { + /* We only get here when doing non-standard JSON encoding */ + DUK_DDD(DUK_DDDPRINT("-> function allowed, serialize to custom format")); + DUK_ASSERT(js_ctx->flag_ext_custom || js_ctx->flag_ext_compatible); + DUK__EMIT_STRIDX(js_ctx, js_ctx->stridx_custom_function); + goto pop2_emitted; + } else { + DUK_DDD(DUK_DDDPRINT("-> will result in undefined (function)")); + goto pop2_undef; + } +#else /* DUK_USE_JX || DUK_USE_JC */ + DUK_DDD(DUK_DDDPRINT("-> will result in undefined (function)")); + goto pop2_undef; +#endif /* DUK_USE_JX || DUK_USE_JC */ + } + } + } /* end switch */ + } + + /* [ ... key val ] */ + + DUK_DDD(DUK_DDDPRINT("value=%!T", (duk_tval *) duk_get_tval(thr, -1))); + + if (duk_check_type_mask(thr, -1, js_ctx->mask_for_undefined)) { + /* will result in undefined */ + DUK_DDD(DUK_DDDPRINT("-> will result in undefined (type mask check)")); + goto pop2_undef; + } + tv = DUK_GET_TVAL_NEGIDX(thr, -1); + + switch (DUK_TVAL_GET_TAG(tv)) { +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + /* When JX/JC not in use, the type mask above will avoid this case if needed. */ + case DUK_TAG_UNDEFINED: { + DUK__EMIT_STRIDX(js_ctx, js_ctx->stridx_custom_undefined); + break; + } +#endif + case DUK_TAG_NULL: { + DUK__EMIT_STRIDX(js_ctx, DUK_STRIDX_LC_NULL); + break; + } + case DUK_TAG_BOOLEAN: { + DUK__EMIT_STRIDX(js_ctx, DUK_TVAL_GET_BOOLEAN(tv) ? + DUK_STRIDX_TRUE : DUK_STRIDX_FALSE); + break; + } +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + /* When JX/JC not in use, the type mask above will avoid this case if needed. */ + case DUK_TAG_POINTER: { + duk__enc_pointer(js_ctx, DUK_TVAL_GET_POINTER(tv)); + break; + } +#endif /* DUK_USE_JX || DUK_USE_JC */ + case DUK_TAG_STRING: { + duk_hstring *h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + goto pop2_undef; + } + duk__enc_quote_string(js_ctx, h); + break; + } + case DUK_TAG_OBJECT: { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + /* Function values are handled completely above (including + * coercion results): + */ + DUK_ASSERT(!DUK_HOBJECT_IS_CALLABLE(h)); + + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_ARRAY) { + duk__enc_array(js_ctx); + } else { + duk__enc_object(js_ctx); + } + break; + } + /* Because plain buffers mimics Uint8Array, they have enumerable + * index properties [0,byteLength[. Because JSON only serializes + * enumerable own properties, no properties can be serialized for + * plain buffers (all virtual properties are non-enumerable). However, + * there may be a .toJSON() method which was already handled above. + */ + case DUK_TAG_BUFFER: { +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom_or_compatible) { + duk__enc_buffer_jx_jc(js_ctx, DUK_TVAL_GET_BUFFER(tv)); + break; + } +#endif + + /* Could implement a fastpath, but the fast path would need + * to handle realloc side effects correctly. + */ + duk_to_object(thr, -1); + duk__enc_object(js_ctx); + break; + } + case DUK_TAG_LIGHTFUNC: { +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + /* We only get here when doing non-standard JSON encoding */ + DUK_ASSERT(js_ctx->flag_ext_custom || js_ctx->flag_ext_compatible); + DUK__EMIT_STRIDX(js_ctx, js_ctx->stridx_custom_function); +#else + /* Standard JSON omits functions */ + DUK_UNREACHABLE(); +#endif + break; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: + /* Number serialization has a significant impact relative to + * other fast path code, so careful fast path for fastints. + */ + duk__enc_fastint_tval(js_ctx, tv); + break; +#endif + default: { + /* number */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + /* XXX: A fast path for usual integers would be useful when + * fastint support is not enabled. + */ + duk__enc_double(js_ctx); + break; + } + } + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + pop2_emitted: +#endif + duk_pop_2(thr); /* [ ... key val ] -> [ ... ] */ + return 1; /* emitted */ + + pop2_undef: + duk_pop_2(thr); /* [ ... key val ] -> [ ... ] */ + return 0; /* not emitted */ +} + +/* E5 Section 15.12.3, main algorithm, step 4.b.ii steps 1-4. */ +DUK_LOCAL duk_bool_t duk__enc_allow_into_proplist(duk_tval *tv) { + duk_small_int_t c; + + /* XXX: some kind of external internal type checker? + * - type mask; symbol flag; class mask + */ + DUK_ASSERT(tv != NULL); + if (DUK_TVAL_IS_STRING(tv)) { + duk_hstring *h; + h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + return 0; + } + return 1; + } else if (DUK_TVAL_IS_NUMBER(tv)) { + return 1; + } else if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h; + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + c = (duk_small_int_t) DUK_HOBJECT_GET_CLASS_NUMBER(h); + if (c == DUK_HOBJECT_CLASS_STRING || c == DUK_HOBJECT_CLASS_NUMBER) { + return 1; + } + } + + return 0; +} + +/* + * JSON.stringify() fast path + * + * Otherwise supports full JSON, JX, and JC features, but bails out on any + * possible side effect which might change the value being serialized. The + * fast path can take advantage of the fact that the value being serialized + * is unchanged so that we can walk directly through property tables etc. + */ + +#if defined(DUK_USE_JSON_STRINGIFY_FASTPATH) +DUK_LOCAL duk_bool_t duk__json_stringify_fast_value(duk_json_enc_ctx *js_ctx, duk_tval *tv) { + duk_uint_fast32_t i, n; + + DUK_DDD(DUK_DDDPRINT("stringify fast: %!T", tv)); + + DUK_ASSERT(js_ctx != NULL); + DUK_ASSERT(js_ctx->thr != NULL); + +#if 0 /* disabled for now */ + restart_match: +#endif + + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: { +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom || js_ctx->flag_ext_compatible) { + DUK__EMIT_STRIDX(js_ctx, js_ctx->stridx_custom_undefined); + break; + } else { + goto emit_undefined; + } +#else + goto emit_undefined; +#endif + } + case DUK_TAG_NULL: { + DUK__EMIT_STRIDX(js_ctx, DUK_STRIDX_LC_NULL); + break; + } + case DUK_TAG_BOOLEAN: { + DUK__EMIT_STRIDX(js_ctx, DUK_TVAL_GET_BOOLEAN(tv) ? + DUK_STRIDX_TRUE : DUK_STRIDX_FALSE); + break; + } + case DUK_TAG_STRING: { + duk_hstring *h; + h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + goto emit_undefined; + } + duk__enc_quote_string(js_ctx, h); + break; + } + case DUK_TAG_OBJECT: { + duk_hobject *obj; + duk_tval *tv_val; + duk_bool_t emitted = 0; + duk_uint32_t c_bit, c_all, c_array, c_unbox, c_undef, + c_func, c_bufobj, c_object, c_abort; + + /* For objects JSON.stringify() only looks for own, enumerable + * properties which is nice for the fast path here. + * + * For arrays JSON.stringify() uses [[Get]] so it will actually + * inherit properties during serialization! This fast path + * supports gappy arrays as long as there's no actual inherited + * property (which might be a getter etc). + * + * Since recursion only happens for objects, we can have both + * recursion and loop checks here. We use a simple, depth-limited + * loop check in the fast path because the object-based tracking + * is very slow (when tested, it accounted for 50% of fast path + * execution time for input data with a lot of small objects!). + */ + + /* XXX: for real world code, could just ignore array inheritance + * and only look at array own properties. + */ + + /* We rely on a few object flag / class number relationships here, + * assert for them. + */ + + obj = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(obj != NULL); + DUK_ASSERT_HOBJECT_VALID(obj); + + /* Once recursion depth is increased, exit path must decrease + * it (though it's OK to abort the fast path). + */ + + DUK_ASSERT_DISABLE(js_ctx->recursion_depth >= 0); /* unsigned */ + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + if (js_ctx->recursion_depth >= js_ctx->recursion_limit) { + DUK_DD(DUK_DDPRINT("fast path recursion limit")); + DUK_ERROR_RANGE(js_ctx->thr, DUK_STR_JSONDEC_RECLIMIT); + DUK_WO_NORETURN(return 0;); + } + + for (i = 0, n = (duk_uint_fast32_t) js_ctx->recursion_depth; i < n; i++) { + if (DUK_UNLIKELY(js_ctx->visiting[i] == obj)) { + DUK_DD(DUK_DDPRINT("fast path loop detect")); + DUK_ERROR_TYPE(js_ctx->thr, DUK_STR_CYCLIC_INPUT); + DUK_WO_NORETURN(return 0;); + } + } + + /* Guaranteed by recursion_limit setup so we don't have to + * check twice. + */ + DUK_ASSERT(js_ctx->recursion_depth < DUK_JSON_ENC_LOOPARRAY); + js_ctx->visiting[js_ctx->recursion_depth] = obj; + js_ctx->recursion_depth++; + + /* If object has a .toJSON() property, we can't be certain + * that it wouldn't mutate any value arbitrarily, so bail + * out of the fast path. + * + * If an object is a Proxy we also can't avoid side effects + * so abandon. + */ + /* XXX: non-callable .toJSON() doesn't need to cause an abort + * but does at the moment, probably not worth fixing. + */ + if (duk_hobject_hasprop_raw(js_ctx->thr, obj, DUK_HTHREAD_STRING_TO_JSON(js_ctx->thr)) || + DUK_HOBJECT_IS_PROXY(obj)) { + DUK_DD(DUK_DDPRINT("object has a .toJSON property or object is a Proxy, abort fast path")); + goto abort_fastpath; + } + + /* We could use a switch-case for the class number but it turns out + * a small if-else ladder on class masks is better. The if-ladder + * should be in order of relevancy. + */ + + /* XXX: move masks to js_ctx? they don't change during one + * fast path invocation. + */ + DUK_ASSERT(DUK_HOBJECT_CLASS_MAX <= 31); +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom_or_compatible) { + c_all = DUK_HOBJECT_CMASK_ALL; + c_array = DUK_HOBJECT_CMASK_ARRAY; + c_unbox = DUK_HOBJECT_CMASK_NUMBER | + DUK_HOBJECT_CMASK_STRING | + DUK_HOBJECT_CMASK_BOOLEAN | + DUK_HOBJECT_CMASK_POINTER; /* Symbols are not unboxed. */ + c_func = DUK_HOBJECT_CMASK_FUNCTION; + c_bufobj = DUK_HOBJECT_CMASK_ALL_BUFOBJS; + c_undef = 0; + c_abort = 0; + c_object = c_all & ~(c_array | c_unbox | c_func | c_bufobj | c_undef | c_abort); + } + else +#endif + { + c_all = DUK_HOBJECT_CMASK_ALL; + c_array = DUK_HOBJECT_CMASK_ARRAY; + c_unbox = DUK_HOBJECT_CMASK_NUMBER | + DUK_HOBJECT_CMASK_STRING | + DUK_HOBJECT_CMASK_BOOLEAN; /* Symbols are not unboxed. */ + c_func = 0; + c_bufobj = 0; + c_undef = DUK_HOBJECT_CMASK_FUNCTION | + DUK_HOBJECT_CMASK_POINTER; + /* As the fast path doesn't currently properly support + * duk_hbufobj virtual properties, abort fast path if + * we encounter them in plain JSON mode. + */ + c_abort = DUK_HOBJECT_CMASK_ALL_BUFOBJS; + c_object = c_all & ~(c_array | c_unbox | c_func | c_bufobj | c_undef | c_abort); + } + + c_bit = (duk_uint32_t) DUK_HOBJECT_GET_CLASS_MASK(obj); + if (c_bit & c_object) { + /* All other object types. */ + DUK__EMIT_1(js_ctx, DUK_ASC_LCURLY); + + /* A non-Array object should not have an array part in practice. + * But since it is supported internally (and perhaps used at some + * point), check and abandon if that's the case. + */ + if (DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + DUK_DD(DUK_DDPRINT("non-Array object has array part, abort fast path")); + goto abort_fastpath; + } + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(obj); i++) { + duk_hstring *k; + duk_size_t prev_size; + + k = DUK_HOBJECT_E_GET_KEY(js_ctx->thr->heap, obj, i); + if (!k) { + continue; + } + if (DUK_HSTRING_HAS_ARRIDX(k)) { + /* If an object has array index keys we would need + * to sort them into the ES2015 enumeration order to + * be consistent with the slow path. Abort the fast + * path and handle in the slow path for now. + */ + DUK_DD(DUK_DDPRINT("property key is an array index, abort fast path")); + goto abort_fastpath; + } + if (!DUK_HOBJECT_E_SLOT_IS_ENUMERABLE(js_ctx->thr->heap, obj, i)) { + continue; + } + if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(js_ctx->thr->heap, obj, i)) { + /* Getter might have arbitrary side effects, + * so bail out. + */ + DUK_DD(DUK_DDPRINT("property is an accessor, abort fast path")); + goto abort_fastpath; + } + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(k))) { + continue; + } + + tv_val = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(js_ctx->thr->heap, obj, i); + + prev_size = DUK_BW_GET_SIZE(js_ctx->thr, &js_ctx->bw); + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth); + duk__enc_key_autoquote(js_ctx, k); + DUK__EMIT_2(js_ctx, DUK_ASC_COLON, DUK_ASC_SPACE); + } else { + duk__enc_key_autoquote(js_ctx, k); + DUK__EMIT_1(js_ctx, DUK_ASC_COLON); + } + + if (duk__json_stringify_fast_value(js_ctx, tv_val) == 0) { + DUK_DD(DUK_DDPRINT("prop value not supported, rewind key and colon")); + DUK_BW_SET_SIZE(js_ctx->thr, &js_ctx->bw, prev_size); + } else { + DUK__EMIT_1(js_ctx, DUK_ASC_COMMA); + emitted = 1; + } + } + + /* If any non-Array value had enumerable virtual own + * properties, they should be serialized here (actually, + * before the explicit properties). Standard types don't. + */ + + if (emitted) { + DUK_ASSERT(*((duk_uint8_t *) DUK_BW_GET_PTR(js_ctx->thr, &js_ctx->bw) - 1) == DUK_ASC_COMMA); + DUK__UNEMIT_1(js_ctx); /* eat trailing comma */ + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + DUK_ASSERT(js_ctx->recursion_depth >= 1); + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth - 1U); + } + } + DUK__EMIT_1(js_ctx, DUK_ASC_RCURLY); + } else if (c_bit & c_array) { + duk_uint_fast32_t arr_len; + duk_uint_fast32_t asize; + + DUK__EMIT_1(js_ctx, DUK_ASC_LBRACKET); + + /* Assume arrays are dense in the fast path. */ + if (!DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + DUK_DD(DUK_DDPRINT("Array object is sparse, abort fast path")); + goto abort_fastpath; + } + + arr_len = (duk_uint_fast32_t) ((duk_harray *) obj)->length; + asize = (duk_uint_fast32_t) DUK_HOBJECT_GET_ASIZE(obj); + /* Array part may be larger than 'length'; if so, iterate + * only up to array 'length'. Array part may also be smaller + * than 'length' in some cases. + */ + for (i = 0; i < arr_len; i++) { + duk_tval *tv_arrval; + duk_hstring *h_tmp; + duk_bool_t has_inherited; + + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth); + } + + if (DUK_LIKELY(i < asize)) { + tv_arrval = DUK_HOBJECT_A_GET_VALUE_PTR(js_ctx->thr->heap, obj, i); + if (DUK_LIKELY(!DUK_TVAL_IS_UNUSED(tv_arrval))) { + /* Expected case: element is present. */ + if (duk__json_stringify_fast_value(js_ctx, tv_arrval) == 0) { + DUK__EMIT_STRIDX(js_ctx, DUK_STRIDX_LC_NULL); + } + goto elem_done; + } + } + + /* Gap in array; check for inherited property, + * bail out if one exists. This should be enough + * to support gappy arrays for all practical code. + */ + + h_tmp = duk_push_uint_to_hstring(js_ctx->thr, (duk_uint_t) i); + has_inherited = duk_hobject_hasprop_raw(js_ctx->thr, obj, h_tmp); + duk_pop(js_ctx->thr); + if (has_inherited) { + DUK_D(DUK_DPRINT("gap in array, conflicting inherited property, abort fast path")); + goto abort_fastpath; + } + + /* Ordinary gap, undefined encodes to 'null' in + * standard JSON, but JX/JC use their form for + * undefined to better preserve the typing. + */ + DUK_D(DUK_DPRINT("gap in array, no conflicting inherited property, remain on fast path")); +#if defined(DUK_USE_JX) + DUK__EMIT_STRIDX(js_ctx, js_ctx->stridx_custom_undefined); +#else + DUK__EMIT_STRIDX(js_ctx, DUK_STRIDX_LC_NULL); +#endif + /* fall through */ + + elem_done: + DUK__EMIT_1(js_ctx, DUK_ASC_COMMA); + emitted = 1; + } + + if (emitted) { + DUK_ASSERT(*((duk_uint8_t *) DUK_BW_GET_PTR(js_ctx->thr, &js_ctx->bw) - 1) == DUK_ASC_COMMA); + DUK__UNEMIT_1(js_ctx); /* eat trailing comma */ + if (DUK_UNLIKELY(js_ctx->h_gap != NULL)) { + DUK_ASSERT(js_ctx->recursion_depth >= 1); + duk__enc_newline_indent(js_ctx, js_ctx->recursion_depth - 1U); + } + } + DUK__EMIT_1(js_ctx, DUK_ASC_RBRACKET); + } else if (c_bit & c_unbox) { + /* Certain boxed types are required to go through + * automatic unboxing. Rely on internal value being + * sane (to avoid infinite recursion). + */ + DUK_ASSERT((c_bit & DUK_HOBJECT_CMASK_SYMBOL) == 0); /* Symbols are not unboxed. */ + +#if 1 + /* The code below is incorrect if .toString() or .valueOf() have + * have been overridden. The correct approach would be to look up + * the method(s) and if they resolve to the built-in function we + * can safely bypass it and look up the internal value directly. + * Unimplemented for now, abort fast path for boxed values. + */ + goto abort_fastpath; +#else /* disabled */ + /* Disabled until fixed, see above. */ + duk_tval *tv_internal; + + DUK_DD(DUK_DDPRINT("auto unboxing in fast path")); + + tv_internal = duk_hobject_get_internal_value_tval_ptr(js_ctx->thr->heap, obj); + DUK_ASSERT(tv_internal != NULL); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv_internal) || + DUK_TVAL_IS_NUMBER(tv_internal) || + DUK_TVAL_IS_BOOLEAN(tv_internal) || + DUK_TVAL_IS_POINTER(tv_internal)); + + tv = tv_internal; + DUK_ASSERT(js_ctx->recursion_depth > 0); + js_ctx->recursion_depth--; /* required to keep recursion depth correct */ + goto restart_match; +#endif /* disabled */ +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + } else if (c_bit & c_func) { + DUK__EMIT_STRIDX(js_ctx, js_ctx->stridx_custom_function); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + } else if (c_bit & c_bufobj) { + duk__enc_bufobj(js_ctx, (duk_hbufobj *) obj); +#endif +#endif + } else if (c_bit & c_abort) { + DUK_DD(DUK_DDPRINT("abort fast path for unsupported type")); + goto abort_fastpath; + } else { + DUK_ASSERT((c_bit & c_undef) != 0); + + /* Must decrease recursion depth before returning. */ + DUK_ASSERT(js_ctx->recursion_depth > 0); + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + js_ctx->recursion_depth--; + goto emit_undefined; + } + + DUK_ASSERT(js_ctx->recursion_depth > 0); + DUK_ASSERT(js_ctx->recursion_depth <= js_ctx->recursion_limit); + js_ctx->recursion_depth--; + break; + } + case DUK_TAG_BUFFER: { + /* Plain buffers are treated like Uint8Arrays: they have + * enumerable indices. Other virtual properties are not + * enumerable, and inherited properties are not serialized. + * However, there can be a replacer (not relevant here) or + * a .toJSON() method (which we need to check for explicitly). + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + if (duk_hobject_hasprop_raw(js_ctx->thr, + js_ctx->thr->builtins[DUK_BIDX_UINT8ARRAY_PROTOTYPE], + DUK_HTHREAD_STRING_TO_JSON(js_ctx->thr))) { + DUK_DD(DUK_DDPRINT("value is a plain buffer and there's an inherited .toJSON, abort fast path")); + goto abort_fastpath; + } +#endif + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom_or_compatible) { + duk__enc_buffer_jx_jc(js_ctx, DUK_TVAL_GET_BUFFER(tv)); + break; + } +#endif + + /* Plain buffers mimic Uint8Arrays, and have enumerable index + * properties. + */ + duk__enc_buffer_json_fastpath(js_ctx, DUK_TVAL_GET_BUFFER(tv)); + break; + } + case DUK_TAG_POINTER: { +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flag_ext_custom_or_compatible) { + duk__enc_pointer(js_ctx, DUK_TVAL_GET_POINTER(tv)); + break; + } else { + goto emit_undefined; + } +#else + goto emit_undefined; +#endif + } + case DUK_TAG_LIGHTFUNC: { + /* A lightfunc might also inherit a .toJSON() so just bail out. */ + /* XXX: Could just lookup .toJSON() and continue in fast path, + * as it would almost never be defined. + */ + DUK_DD(DUK_DDPRINT("value is a lightfunc, abort fast path")); + goto abort_fastpath; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: { + /* Number serialization has a significant impact relative to + * other fast path code, so careful fast path for fastints. + */ + duk__enc_fastint_tval(js_ctx, tv); + break; + } +#endif + default: { + /* XXX: A fast path for usual integers would be useful when + * fastint support is not enabled. + */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + + /* XXX: Stack discipline is annoying, could be changed in numconv. */ + duk_push_tval(js_ctx->thr, tv); + duk__enc_double(js_ctx); + duk_pop(js_ctx->thr); + +#if 0 + /* Could also rely on native sprintf(), but it will handle + * values like NaN, Infinity, -0, exponent notation etc in + * a JSON-incompatible way. + */ + duk_double_t d; + char buf[64]; + + DUK_ASSERT(DUK_TVAL_IS_DOUBLE(tv)); + d = DUK_TVAL_GET_DOUBLE(tv); + DUK_SPRINTF(buf, "%lg", d); + DUK__EMIT_CSTR(js_ctx, buf); +#endif + } + } + return 1; /* not undefined */ + + emit_undefined: + return 0; /* value was undefined/unsupported */ + + abort_fastpath: + /* Error message doesn't matter: the error is ignored anyway. */ + DUK_DD(DUK_DDPRINT("aborting fast path")); + DUK_ERROR_INTERNAL(js_ctx->thr); + DUK_WO_NORETURN(return 0;); +} + +DUK_LOCAL duk_ret_t duk__json_stringify_fast(duk_hthread *thr, void *udata) { + duk_json_enc_ctx *js_ctx; + duk_tval *tv; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(udata != NULL); + + js_ctx = (duk_json_enc_ctx *) udata; + DUK_ASSERT(js_ctx != NULL); + + tv = DUK_GET_TVAL_NEGIDX(thr, -1); + if (duk__json_stringify_fast_value(js_ctx, tv) == 0) { + DUK_DD(DUK_DDPRINT("top level value not supported, fail fast path")); + DUK_DCERROR_TYPE_INVALID_ARGS(thr); /* Error message is ignored, so doesn't matter. */ + } + + return 0; +} +#endif /* DUK_USE_JSON_STRINGIFY_FASTPATH */ + +/* + * Top level wrappers + */ + +DUK_INTERNAL +void duk_bi_json_parse_helper(duk_hthread *thr, + duk_idx_t idx_value, + duk_idx_t idx_reviver, + duk_small_uint_t flags) { + duk_json_dec_ctx js_ctx_alloc; + duk_json_dec_ctx *js_ctx = &js_ctx_alloc; + duk_hstring *h_text; +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t entry_top = duk_get_top(thr); +#endif + + /* negative top-relative indices not allowed now */ + DUK_ASSERT(idx_value == DUK_INVALID_INDEX || idx_value >= 0); + DUK_ASSERT(idx_reviver == DUK_INVALID_INDEX || idx_reviver >= 0); + + DUK_DDD(DUK_DDDPRINT("JSON parse start: text=%!T, reviver=%!T, flags=0x%08lx, stack_top=%ld", + (duk_tval *) duk_get_tval(thr, idx_value), + (duk_tval *) duk_get_tval(thr, idx_reviver), + (unsigned long) flags, + (long) duk_get_top(thr))); + + duk_memzero(&js_ctx_alloc, sizeof(js_ctx_alloc)); + js_ctx->thr = thr; +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + /* nothing now */ +#endif + js_ctx->recursion_limit = DUK_USE_JSON_DEC_RECLIMIT; + DUK_ASSERT(js_ctx->recursion_depth == 0); + + /* Flag handling currently assumes that flags are consistent. This is OK + * because the call sites are now strictly controlled. + */ + + js_ctx->flags = flags; +#if defined(DUK_USE_JX) + js_ctx->flag_ext_custom = flags & DUK_JSON_FLAG_EXT_CUSTOM; +#endif +#if defined(DUK_USE_JC) + js_ctx->flag_ext_compatible = flags & DUK_JSON_FLAG_EXT_COMPATIBLE; +#endif +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + js_ctx->flag_ext_custom_or_compatible = flags & (DUK_JSON_FLAG_EXT_CUSTOM | DUK_JSON_FLAG_EXT_COMPATIBLE); +#endif + + h_text = duk_to_hstring(thr, idx_value); /* coerce in-place; rejects Symbols */ + DUK_ASSERT(h_text != NULL); + + /* JSON parsing code is allowed to read [p_start,p_end]: p_end is + * valid and points to the string NUL terminator (which is always + * guaranteed for duk_hstrings. + */ + js_ctx->p_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_text); + js_ctx->p = js_ctx->p_start; + js_ctx->p_end = ((const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_text)) + + DUK_HSTRING_GET_BYTELEN(h_text); + DUK_ASSERT(*(js_ctx->p_end) == 0x00); + + duk__dec_value(js_ctx); /* -> [ ... value ] */ + + /* Trailing whitespace has been eaten by duk__dec_value(), so if + * we're not at end of input here, it's a SyntaxError. + */ + + if (js_ctx->p != js_ctx->p_end) { + duk__dec_syntax_error(js_ctx); + } + + if (duk_is_callable(thr, idx_reviver)) { + DUK_DDD(DUK_DDDPRINT("applying reviver: %!T", + (duk_tval *) duk_get_tval(thr, idx_reviver))); + + js_ctx->idx_reviver = idx_reviver; + + duk_push_object(thr); + duk_dup_m2(thr); /* -> [ ... val root val ] */ + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_EMPTY_STRING); /* default attrs ok */ + duk_push_hstring_stridx(thr, DUK_STRIDX_EMPTY_STRING); /* -> [ ... val root "" ] */ + + DUK_DDD(DUK_DDDPRINT("start reviver walk, root=%!T, name=%!T", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + + duk__dec_reviver_walk(js_ctx); /* [ ... val root "" ] -> [ ... val val' ] */ + duk_remove_m2(thr); /* -> [ ... val' ] */ + } else { + DUK_DDD(DUK_DDDPRINT("reviver does not exist or is not callable: %!T", + (duk_tval *) duk_get_tval(thr, idx_reviver))); + } + + /* Final result is at stack top. */ + + DUK_DDD(DUK_DDDPRINT("JSON parse end: text=%!T, reviver=%!T, flags=0x%08lx, result=%!T, stack_top=%ld", + (duk_tval *) duk_get_tval(thr, idx_value), + (duk_tval *) duk_get_tval(thr, idx_reviver), + (unsigned long) flags, + (duk_tval *) duk_get_tval(thr, -1), + (long) duk_get_top(thr))); + + DUK_ASSERT(duk_get_top(thr) == entry_top + 1); +} + +DUK_INTERNAL +void duk_bi_json_stringify_helper(duk_hthread *thr, + duk_idx_t idx_value, + duk_idx_t idx_replacer, + duk_idx_t idx_space, + duk_small_uint_t flags) { + duk_json_enc_ctx js_ctx_alloc; + duk_json_enc_ctx *js_ctx = &js_ctx_alloc; + duk_hobject *h; + duk_idx_t idx_holder; + duk_idx_t entry_top; + + /* negative top-relative indices not allowed now */ + DUK_ASSERT(idx_value == DUK_INVALID_INDEX || idx_value >= 0); + DUK_ASSERT(idx_replacer == DUK_INVALID_INDEX || idx_replacer >= 0); + DUK_ASSERT(idx_space == DUK_INVALID_INDEX || idx_space >= 0); + + DUK_DDD(DUK_DDDPRINT("JSON stringify start: value=%!T, replacer=%!T, space=%!T, flags=0x%08lx, stack_top=%ld", + (duk_tval *) duk_get_tval(thr, idx_value), + (duk_tval *) duk_get_tval(thr, idx_replacer), + (duk_tval *) duk_get_tval(thr, idx_space), + (unsigned long) flags, + (long) duk_get_top(thr))); + + entry_top = duk_get_top(thr); + + /* + * Context init + */ + + duk_memzero(&js_ctx_alloc, sizeof(js_ctx_alloc)); + js_ctx->thr = thr; +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + js_ctx->h_replacer = NULL; + js_ctx->h_gap = NULL; +#endif + js_ctx->idx_proplist = -1; + + /* Flag handling currently assumes that flags are consistent. This is OK + * because the call sites are now strictly controlled. + */ + + js_ctx->flags = flags; + js_ctx->flag_ascii_only = flags & DUK_JSON_FLAG_ASCII_ONLY; + js_ctx->flag_avoid_key_quotes = flags & DUK_JSON_FLAG_AVOID_KEY_QUOTES; +#if defined(DUK_USE_JX) + js_ctx->flag_ext_custom = flags & DUK_JSON_FLAG_EXT_CUSTOM; +#endif +#if defined(DUK_USE_JC) + js_ctx->flag_ext_compatible = flags & DUK_JSON_FLAG_EXT_COMPATIBLE; +#endif +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + js_ctx->flag_ext_custom_or_compatible = flags & (DUK_JSON_FLAG_EXT_CUSTOM | DUK_JSON_FLAG_EXT_COMPATIBLE); +#endif + + /* The #if defined() clutter here handles the JX/JC enable/disable + * combinations properly. + */ +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + js_ctx->stridx_custom_undefined = DUK_STRIDX_LC_NULL; /* standard JSON; array gaps */ +#if defined(DUK_USE_JX) + if (flags & DUK_JSON_FLAG_EXT_CUSTOM) { + js_ctx->stridx_custom_undefined = DUK_STRIDX_LC_UNDEFINED; + js_ctx->stridx_custom_nan = DUK_STRIDX_NAN; + js_ctx->stridx_custom_neginf = DUK_STRIDX_MINUS_INFINITY; + js_ctx->stridx_custom_posinf = DUK_STRIDX_INFINITY; + js_ctx->stridx_custom_function = + (flags & DUK_JSON_FLAG_AVOID_KEY_QUOTES) ? + DUK_STRIDX_JSON_EXT_FUNCTION2 : + DUK_STRIDX_JSON_EXT_FUNCTION1; + } +#endif /* DUK_USE_JX */ +#if defined(DUK_USE_JX) && defined(DUK_USE_JC) + else +#endif /* DUK_USE_JX && DUK_USE_JC */ +#if defined(DUK_USE_JC) + if (js_ctx->flags & DUK_JSON_FLAG_EXT_COMPATIBLE) { + js_ctx->stridx_custom_undefined = DUK_STRIDX_JSON_EXT_UNDEFINED; + js_ctx->stridx_custom_nan = DUK_STRIDX_JSON_EXT_NAN; + js_ctx->stridx_custom_neginf = DUK_STRIDX_JSON_EXT_NEGINF; + js_ctx->stridx_custom_posinf = DUK_STRIDX_JSON_EXT_POSINF; + js_ctx->stridx_custom_function = DUK_STRIDX_JSON_EXT_FUNCTION1; + } +#endif /* DUK_USE_JC */ +#endif /* DUK_USE_JX || DUK_USE_JC */ + +#if defined(DUK_USE_JX) || defined(DUK_USE_JC) + if (js_ctx->flags & (DUK_JSON_FLAG_EXT_CUSTOM | + DUK_JSON_FLAG_EXT_COMPATIBLE)) { + DUK_ASSERT(js_ctx->mask_for_undefined == 0); /* already zero */ + } + else +#endif /* DUK_USE_JX || DUK_USE_JC */ + { + /* Plain buffer is treated like ArrayBuffer and serialized. + * Lightfuncs are treated like objects, but JSON explicitly + * skips serializing Function objects so we can just reject + * lightfuncs here. + */ + js_ctx->mask_for_undefined = DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_POINTER | + DUK_TYPE_MASK_LIGHTFUNC; + } + + DUK_BW_INIT_PUSHBUF(thr, &js_ctx->bw, DUK__JSON_STRINGIFY_BUFSIZE); + + js_ctx->idx_loop = duk_push_bare_object(thr); + DUK_ASSERT(js_ctx->idx_loop >= 0); + + /* [ ... buf loop ] */ + + /* + * Process replacer/proplist (2nd argument to JSON.stringify) + */ + + h = duk_get_hobject(thr, idx_replacer); + if (h != NULL) { + if (DUK_HOBJECT_IS_CALLABLE(h)) { + js_ctx->h_replacer = h; + } else if (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_ARRAY) { + /* Here the specification requires correct array index enumeration + * which is a bit tricky for sparse arrays (it is handled by the + * enum setup code). We now enumerate ancestors too, although the + * specification is not very clear on whether that is required. + */ + + duk_uarridx_t plist_idx = 0; + duk_small_uint_t enum_flags; + + js_ctx->idx_proplist = duk_push_array(thr); /* XXX: array internal? */ + + enum_flags = DUK_ENUM_ARRAY_INDICES_ONLY | + DUK_ENUM_SORT_ARRAY_INDICES; /* expensive flag */ + duk_enum(thr, idx_replacer, enum_flags); + while (duk_next(thr, -1 /*enum_index*/, 1 /*get_value*/)) { + /* [ ... proplist enum_obj key val ] */ + if (duk__enc_allow_into_proplist(duk_get_tval(thr, -1))) { + /* XXX: duplicates should be eliminated here */ + DUK_DDD(DUK_DDDPRINT("proplist enum: key=%!T, val=%!T --> accept", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + duk_to_string(thr, -1); /* extra coercion of strings is OK */ + duk_put_prop_index(thr, -4, plist_idx); /* -> [ ... proplist enum_obj key ] */ + plist_idx++; + duk_pop(thr); + } else { + DUK_DDD(DUK_DDDPRINT("proplist enum: key=%!T, val=%!T --> reject", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + duk_pop_2(thr); + } + } + duk_pop(thr); /* pop enum */ + + /* [ ... proplist ] */ + } + } + + /* [ ... buf loop (proplist) ] */ + + /* + * Process space (3rd argument to JSON.stringify) + */ + + h = duk_get_hobject(thr, idx_space); + if (h != NULL) { + duk_small_uint_t c = DUK_HOBJECT_GET_CLASS_NUMBER(h); + if (c == DUK_HOBJECT_CLASS_NUMBER) { + duk_to_number(thr, idx_space); + } else if (c == DUK_HOBJECT_CLASS_STRING) { + duk_to_string(thr, idx_space); + } + } + + if (duk_is_number(thr, idx_space)) { + duk_small_int_t nspace; + /* spaces[] must be static to allow initializer with old compilers like BCC */ + static const char spaces[10] = { + DUK_ASC_SPACE, DUK_ASC_SPACE, DUK_ASC_SPACE, DUK_ASC_SPACE, + DUK_ASC_SPACE, DUK_ASC_SPACE, DUK_ASC_SPACE, DUK_ASC_SPACE, + DUK_ASC_SPACE, DUK_ASC_SPACE + }; /* XXX: helper */ + + /* ToInteger() coercion; NaN -> 0, infinities are clamped to 0 and 10 */ + nspace = (duk_small_int_t) duk_to_int_clamped(thr, idx_space, 0 /*minval*/, 10 /*maxval*/); + DUK_ASSERT(nspace >= 0 && nspace <= 10); + + duk_push_lstring(thr, spaces, (duk_size_t) nspace); + js_ctx->h_gap = duk_known_hstring(thr, -1); + DUK_ASSERT(js_ctx->h_gap != NULL); + } else if (duk_is_string_notsymbol(thr, idx_space)) { + duk_dup(thr, idx_space); + duk_substring(thr, -1, 0, 10); /* clamp to 10 chars */ + js_ctx->h_gap = duk_known_hstring(thr, -1); + } else { + /* nop */ + } + + if (js_ctx->h_gap != NULL) { + /* If gap is empty, behave as if not given at all. Check + * against byte length because character length is more + * expensive. + */ + if (DUK_HSTRING_GET_BYTELEN(js_ctx->h_gap) == 0) { + js_ctx->h_gap = NULL; + } + } + + /* [ ... buf loop (proplist) (gap) ] */ + + /* + * Fast path: assume no mutation, iterate object property tables + * directly; bail out if that assumption doesn't hold. + */ + +#if defined(DUK_USE_JSON_STRINGIFY_FASTPATH) + if (js_ctx->h_replacer == NULL && /* replacer is a mutation risk */ + js_ctx->idx_proplist == -1) { /* proplist is very rare */ + duk_int_t pcall_rc; + duk_small_uint_t prev_ms_base_flags; + + DUK_DD(DUK_DDPRINT("try JSON.stringify() fast path")); + + /* Use recursion_limit to ensure we don't overwrite js_ctx->visiting[] + * array so we don't need two counter checks in the fast path. The + * slow path has a much larger recursion limit which we'll use if + * necessary. + */ + DUK_ASSERT(DUK_USE_JSON_ENC_RECLIMIT >= DUK_JSON_ENC_LOOPARRAY); + js_ctx->recursion_limit = DUK_JSON_ENC_LOOPARRAY; + DUK_ASSERT(js_ctx->recursion_depth == 0); + + /* Execute the fast path in a protected call. If any error is thrown, + * fall back to the slow path. This includes e.g. recursion limit + * because the fast path has a smaller recursion limit (and simpler, + * limited loop detection). + */ + + duk_dup(thr, idx_value); + + /* Must prevent finalizers which may have arbitrary side effects. */ + prev_ms_base_flags = thr->heap->ms_base_flags; + thr->heap->ms_base_flags |= + DUK_MS_FLAG_NO_OBJECT_COMPACTION; /* Avoid attempt to compact any objects. */ + thr->heap->pf_prevent_count++; /* Prevent finalizers. */ + DUK_ASSERT(thr->heap->pf_prevent_count != 0); /* Wrap. */ + + pcall_rc = duk_safe_call(thr, duk__json_stringify_fast, (void *) js_ctx /*udata*/, 1 /*nargs*/, 0 /*nret*/); + + DUK_ASSERT(thr->heap->pf_prevent_count > 0); + thr->heap->pf_prevent_count--; + thr->heap->ms_base_flags = prev_ms_base_flags; + + if (pcall_rc == DUK_EXEC_SUCCESS) { + DUK_DD(DUK_DDPRINT("fast path successful")); + DUK_BW_PUSH_AS_STRING(thr, &js_ctx->bw); + goto replace_finished; + } + + /* We come here for actual aborts (like encountering .toJSON()) + * but also for recursion/loop errors. Bufwriter size can be + * kept because we'll probably need at least as much as we've + * allocated so far. + */ + DUK_D(DUK_DPRINT("fast path failed, serialize using slow path instead")); + DUK_BW_RESET_SIZE(thr, &js_ctx->bw); + js_ctx->recursion_depth = 0; + } +#endif + + /* + * Create wrapper object and serialize + */ + + idx_holder = duk_push_object(thr); + duk_dup(thr, idx_value); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_EMPTY_STRING); + + DUK_DDD(DUK_DDDPRINT("before: flags=0x%08lx, loop=%!T, replacer=%!O, " + "proplist=%!T, gap=%!O, holder=%!T", + (unsigned long) js_ctx->flags, + (duk_tval *) duk_get_tval(thr, js_ctx->idx_loop), + (duk_heaphdr *) js_ctx->h_replacer, + (duk_tval *) (js_ctx->idx_proplist >= 0 ? duk_get_tval(thr, js_ctx->idx_proplist) : NULL), + (duk_heaphdr *) js_ctx->h_gap, + (duk_tval *) duk_get_tval(thr, -1))); + + /* serialize the wrapper with empty string key */ + + duk_push_hstring_empty(thr); + + /* [ ... buf loop (proplist) (gap) holder "" ] */ + + js_ctx->recursion_limit = DUK_USE_JSON_ENC_RECLIMIT; + DUK_ASSERT(js_ctx->recursion_depth == 0); + + if (DUK_UNLIKELY(duk__enc_value(js_ctx, idx_holder) == 0)) { /* [ ... holder key ] -> [ ... holder ] */ + /* Result is undefined. */ + duk_push_undefined(thr); + } else { + /* Convert buffer to result string. */ + DUK_BW_PUSH_AS_STRING(thr, &js_ctx->bw); + } + + DUK_DDD(DUK_DDDPRINT("after: flags=0x%08lx, loop=%!T, replacer=%!O, " + "proplist=%!T, gap=%!O, holder=%!T", + (unsigned long) js_ctx->flags, + (duk_tval *) duk_get_tval(thr, js_ctx->idx_loop), + (duk_heaphdr *) js_ctx->h_replacer, + (duk_tval *) (js_ctx->idx_proplist >= 0 ? duk_get_tval(thr, js_ctx->idx_proplist) : NULL), + (duk_heaphdr *) js_ctx->h_gap, + (duk_tval *) duk_get_tval(thr, idx_holder))); + + /* The stack has a variable shape here, so force it to the + * desired one explicitly. + */ + +#if defined(DUK_USE_JSON_STRINGIFY_FASTPATH) + replace_finished: +#endif + duk_replace(thr, entry_top); + duk_set_top(thr, entry_top + 1); + + DUK_DDD(DUK_DDDPRINT("JSON stringify end: value=%!T, replacer=%!T, space=%!T, " + "flags=0x%08lx, result=%!T, stack_top=%ld", + (duk_tval *) duk_get_tval(thr, idx_value), + (duk_tval *) duk_get_tval(thr, idx_replacer), + (duk_tval *) duk_get_tval(thr, idx_space), + (unsigned long) flags, + (duk_tval *) duk_get_tval(thr, -1), + (long) duk_get_top(thr))); + + DUK_ASSERT(duk_get_top(thr) == entry_top + 1); +} + +#if defined(DUK_USE_JSON_BUILTIN) + +/* + * Entry points + */ + +DUK_INTERNAL duk_ret_t duk_bi_json_object_parse(duk_hthread *thr) { + duk_bi_json_parse_helper(thr, + 0 /*idx_value*/, + 1 /*idx_replacer*/, + 0 /*flags*/); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_json_object_stringify(duk_hthread *thr) { + duk_bi_json_stringify_helper(thr, + 0 /*idx_value*/, + 1 /*idx_replacer*/, + 2 /*idx_space*/, + 0 /*flags*/); + return 1; +} + +#endif /* DUK_USE_JSON_BUILTIN */ + +#endif /* DUK_USE_JSON_SUPPORT */ + +/* automatic undefs */ +#undef DUK__EMIT_1 +#undef DUK__EMIT_2 +#undef DUK__EMIT_CSTR +#undef DUK__EMIT_HSTR +#undef DUK__EMIT_STRIDX +#undef DUK__JSON_DECSTR_BUFSIZE +#undef DUK__JSON_DECSTR_CHUNKSIZE +#undef DUK__JSON_ENCSTR_CHUNKSIZE +#undef DUK__JSON_MAX_ESC_LEN +#undef DUK__JSON_STRINGIFY_BUFSIZE +#undef DUK__MKESC +#undef DUK__UNEMIT_1 +#line 1 "duk_bi_math.c" +/* + * Math built-ins + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_MATH_BUILTIN) + +/* + * Use static helpers which can work with math.h functions matching + * the following signatures. This is not portable if any of these math + * functions is actually a macro. + * + * Typing here is intentionally 'double' wherever values interact with + * the standard library APIs. + */ + +typedef double (*duk__one_arg_func)(double); +typedef double (*duk__two_arg_func)(double, double); + +DUK_LOCAL duk_ret_t duk__math_minmax(duk_hthread *thr, duk_double_t initial, duk__two_arg_func min_max) { + duk_idx_t n = duk_get_top(thr); + duk_idx_t i; + duk_double_t res = initial; + duk_double_t t; + + /* + * Note: fmax() does not match the E5 semantics. E5 requires + * that if -any- input to Math.max() is a NaN, the result is a + * NaN. fmax() will return a NaN only if -both- inputs are NaN. + * Same applies to fmin(). + * + * Note: every input value must be coerced with ToNumber(), even + * if we know the result will be a NaN anyway: ToNumber() may have + * side effects for which even order of evaluation matters. + */ + + for (i = 0; i < n; i++) { + t = duk_to_number(thr, i); + if (DUK_FPCLASSIFY(t) == DUK_FP_NAN || DUK_FPCLASSIFY(res) == DUK_FP_NAN) { + /* Note: not normalized, but duk_push_number() will normalize */ + res = (duk_double_t) DUK_DOUBLE_NAN; + } else { + res = (duk_double_t) min_max(res, (double) t); + } + } + + duk_push_number(thr, res); + return 1; +} + +DUK_LOCAL double duk__fmin_fixed(double x, double y) { + /* fmin() with args -0 and +0 is not guaranteed to return + * -0 as ECMAScript requires. + */ + if (x == 0 && y == 0) { + duk_double_union du1, du2; + du1.d = x; + du2.d = y; + + /* Already checked to be zero so these must hold, and allow us + * to check for "x is -0 or y is -0" by ORing the high parts + * for comparison. + */ + DUK_ASSERT(du1.ui[DUK_DBL_IDX_UI0] == 0 || du1.ui[DUK_DBL_IDX_UI0] == 0x80000000UL); + DUK_ASSERT(du2.ui[DUK_DBL_IDX_UI0] == 0 || du2.ui[DUK_DBL_IDX_UI0] == 0x80000000UL); + + /* XXX: what's the safest way of creating a negative zero? */ + if ((du1.ui[DUK_DBL_IDX_UI0] | du2.ui[DUK_DBL_IDX_UI0]) != 0) { + /* Enter here if either x or y (or both) is -0. */ + return -0.0; + } else { + return +0.0; + } + } + return duk_double_fmin(x, y); +} + +DUK_LOCAL double duk__fmax_fixed(double x, double y) { + /* fmax() with args -0 and +0 is not guaranteed to return + * +0 as ECMAScript requires. + */ + if (x == 0 && y == 0) { + if (DUK_SIGNBIT(x) == 0 || DUK_SIGNBIT(y) == 0) { + return +0.0; + } else { + return -0.0; + } + } + return duk_double_fmax(x, y); +} + +#if defined(DUK_USE_ES6) +DUK_LOCAL double duk__cbrt(double x) { + /* cbrt() is C99. To avoid hassling embedders with the need to provide a + * cube root function, we can get by with pow(). The result is not + * identical, but that's OK: ES2015 says it's implementation-dependent. + */ + +#if defined(DUK_CBRT) + /* cbrt() matches ES2015 requirements. */ + return DUK_CBRT(x); +#else + duk_small_int_t c = (duk_small_int_t) DUK_FPCLASSIFY(x); + + /* pow() does not, however. */ + if (c == DUK_FP_NAN || c == DUK_FP_INFINITE || c == DUK_FP_ZERO) { + return x; + } + if (DUK_SIGNBIT(x)) { + return -DUK_POW(-x, 1.0 / 3.0); + } else { + return DUK_POW(x, 1.0 / 3.0); + } +#endif +} + +DUK_LOCAL double duk__log2(double x) { +#if defined(DUK_LOG2) + return DUK_LOG2(x); +#else + return DUK_LOG(x) * DUK_DOUBLE_LOG2E; +#endif +} + +DUK_LOCAL double duk__log10(double x) { +#if defined(DUK_LOG10) + return DUK_LOG10(x); +#else + return DUK_LOG(x) * DUK_DOUBLE_LOG10E; +#endif +} + +DUK_LOCAL double duk__trunc(double x) { +#if defined(DUK_TRUNC) + return DUK_TRUNC(x); +#else + /* Handles -0 correctly: -0.0 matches 'x >= 0.0' but floor() + * is required to return -0 when the argument is -0. + */ + return x >= 0.0 ? DUK_FLOOR(x) : DUK_CEIL(x); +#endif +} +#endif /* DUK_USE_ES6 */ + +DUK_LOCAL double duk__round_fixed(double x) { + /* Numbers half-way between integers must be rounded towards +Infinity, + * e.g. -3.5 must be rounded to -3 (not -4). When rounded to zero, zero + * sign must be set appropriately. E5.1 Section 15.8.2.15. + * + * Note that ANSI C round() is "round to nearest integer, away from zero", + * which is incorrect for negative values. Here we make do with floor(). + */ + + duk_small_int_t c = (duk_small_int_t) DUK_FPCLASSIFY(x); + if (c == DUK_FP_NAN || c == DUK_FP_INFINITE || c == DUK_FP_ZERO) { + return x; + } + + /* + * x is finite and non-zero + * + * -1.6 -> floor(-1.1) -> -2 + * -1.5 -> floor(-1.0) -> -1 (towards +Inf) + * -1.4 -> floor(-0.9) -> -1 + * -0.5 -> -0.0 (special case) + * -0.1 -> -0.0 (special case) + * +0.1 -> +0.0 (special case) + * +0.5 -> floor(+1.0) -> 1 (towards +Inf) + * +1.4 -> floor(+1.9) -> 1 + * +1.5 -> floor(+2.0) -> 2 (towards +Inf) + * +1.6 -> floor(+2.1) -> 2 + */ + + if (x >= -0.5 && x < 0.5) { + /* +0.5 is handled by floor, this is on purpose */ + if (x < 0.0) { + return -0.0; + } else { + return +0.0; + } + } + + return DUK_FLOOR(x + 0.5); +} + +/* Wrappers for calling standard math library methods. These may be required + * on platforms where one or more of the math built-ins are defined as macros + * or inline functions and are thus not suitable to be used as function pointers. + */ +#if defined(DUK_USE_AVOID_PLATFORM_FUNCPTRS) +DUK_LOCAL double duk__fabs(double x) { + return DUK_FABS(x); +} +DUK_LOCAL double duk__acos(double x) { + return DUK_ACOS(x); +} +DUK_LOCAL double duk__asin(double x) { + return DUK_ASIN(x); +} +DUK_LOCAL double duk__atan(double x) { + return DUK_ATAN(x); +} +DUK_LOCAL double duk__ceil(double x) { + return DUK_CEIL(x); +} +DUK_LOCAL double duk__cos(double x) { + return DUK_COS(x); +} +DUK_LOCAL double duk__exp(double x) { + return DUK_EXP(x); +} +DUK_LOCAL double duk__floor(double x) { + return DUK_FLOOR(x); +} +DUK_LOCAL double duk__log(double x) { + return DUK_LOG(x); +} +DUK_LOCAL double duk__sin(double x) { + return DUK_SIN(x); +} +DUK_LOCAL double duk__sqrt(double x) { + return DUK_SQRT(x); +} +DUK_LOCAL double duk__tan(double x) { + return DUK_TAN(x); +} +DUK_LOCAL double duk__atan2_fixed(double x, double y) { +#if defined(DUK_USE_ATAN2_WORKAROUNDS) + /* Specific fixes to common atan2() implementation issues: + * - test-bug-mingw-math-issues.js + */ + if (DUK_ISINF(x) && DUK_ISINF(y)) { + if (DUK_SIGNBIT(x)) { + if (DUK_SIGNBIT(y)) { + return -2.356194490192345; + } else { + return -0.7853981633974483; + } + } else { + if (DUK_SIGNBIT(y)) { + return 2.356194490192345; + } else { + return 0.7853981633974483; + } + } + } +#else + /* Some ISO C assumptions. */ + DUK_ASSERT(DUK_ATAN2(DUK_DOUBLE_INFINITY, DUK_DOUBLE_INFINITY) == 0.7853981633974483); + DUK_ASSERT(DUK_ATAN2(-DUK_DOUBLE_INFINITY, DUK_DOUBLE_INFINITY) == -0.7853981633974483); + DUK_ASSERT(DUK_ATAN2(DUK_DOUBLE_INFINITY, -DUK_DOUBLE_INFINITY) == 2.356194490192345); + DUK_ASSERT(DUK_ATAN2(-DUK_DOUBLE_INFINITY, -DUK_DOUBLE_INFINITY) == -2.356194490192345); +#endif + + return DUK_ATAN2(x, y); +} +#endif /* DUK_USE_AVOID_PLATFORM_FUNCPTRS */ + +/* order must match constants in genbuiltins.py */ +DUK_LOCAL const duk__one_arg_func duk__one_arg_funcs[] = { +#if defined(DUK_USE_AVOID_PLATFORM_FUNCPTRS) + duk__fabs, + duk__acos, + duk__asin, + duk__atan, + duk__ceil, + duk__cos, + duk__exp, + duk__floor, + duk__log, + duk__round_fixed, + duk__sin, + duk__sqrt, + duk__tan, +#if defined(DUK_USE_ES6) + duk__cbrt, + duk__log2, + duk__log10, + duk__trunc +#endif +#else /* DUK_USE_AVOID_PLATFORM_FUNCPTRS */ + DUK_FABS, + DUK_ACOS, + DUK_ASIN, + DUK_ATAN, + DUK_CEIL, + DUK_COS, + DUK_EXP, + DUK_FLOOR, + DUK_LOG, + duk__round_fixed, + DUK_SIN, + DUK_SQRT, + DUK_TAN, +#if defined(DUK_USE_ES6) + duk__cbrt, + duk__log2, + duk__log10, + duk__trunc +#endif +#endif /* DUK_USE_AVOID_PLATFORM_FUNCPTRS */ +}; + +/* order must match constants in genbuiltins.py */ +DUK_LOCAL const duk__two_arg_func duk__two_arg_funcs[] = { +#if defined(DUK_USE_AVOID_PLATFORM_FUNCPTRS) + duk__atan2_fixed, + duk_js_arith_pow +#else + duk__atan2_fixed, + duk_js_arith_pow +#endif +}; + +DUK_INTERNAL duk_ret_t duk_bi_math_object_onearg_shared(duk_hthread *thr) { + duk_small_int_t fun_idx = duk_get_current_magic(thr); + duk__one_arg_func fun; + duk_double_t arg1; + + DUK_ASSERT(fun_idx >= 0); + DUK_ASSERT(fun_idx < (duk_small_int_t) (sizeof(duk__one_arg_funcs) / sizeof(duk__one_arg_func))); + arg1 = duk_to_number(thr, 0); + fun = duk__one_arg_funcs[fun_idx]; + duk_push_number(thr, (duk_double_t) fun((double) arg1)); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_math_object_twoarg_shared(duk_hthread *thr) { + duk_small_int_t fun_idx = duk_get_current_magic(thr); + duk__two_arg_func fun; + duk_double_t arg1; + duk_double_t arg2; + + DUK_ASSERT(fun_idx >= 0); + DUK_ASSERT(fun_idx < (duk_small_int_t) (sizeof(duk__two_arg_funcs) / sizeof(duk__two_arg_func))); + arg1 = duk_to_number(thr, 0); /* explicit ordered evaluation to match coercion semantics */ + arg2 = duk_to_number(thr, 1); + fun = duk__two_arg_funcs[fun_idx]; + duk_push_number(thr, (duk_double_t) fun((double) arg1, (double) arg2)); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_math_object_max(duk_hthread *thr) { + return duk__math_minmax(thr, -DUK_DOUBLE_INFINITY, duk__fmax_fixed); +} + +DUK_INTERNAL duk_ret_t duk_bi_math_object_min(duk_hthread *thr) { + return duk__math_minmax(thr, DUK_DOUBLE_INFINITY, duk__fmin_fixed); +} + +DUK_INTERNAL duk_ret_t duk_bi_math_object_random(duk_hthread *thr) { + duk_push_number(thr, (duk_double_t) DUK_UTIL_GET_RANDOM_DOUBLE(thr)); + return 1; +} + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_math_object_hypot(duk_hthread *thr) { + /* + * E6 Section 20.2.2.18: Math.hypot + * + * - If no arguments are passed, the result is +0. + * - If any argument is +inf, the result is +inf. + * - If any argument is -inf, the result is +inf. + * - If no argument is +inf or -inf, and any argument is NaN, the result is + * NaN. + * - If all arguments are either +0 or -0, the result is +0. + */ + + duk_idx_t nargs; + duk_idx_t i; + duk_bool_t found_nan; + duk_double_t max; + duk_double_t sum, summand; + duk_double_t comp, prelim; + duk_double_t t; + + nargs = duk_get_top(thr); + + /* Find the highest value. Also ToNumber() coerces. */ + max = 0.0; + found_nan = 0; + for (i = 0; i < nargs; i++) { + t = DUK_FABS(duk_to_number(thr, i)); + if (DUK_FPCLASSIFY(t) == DUK_FP_NAN) { + found_nan = 1; + } else { + max = duk_double_fmax(max, t); + } + } + + /* Early return cases. */ + if (max == DUK_DOUBLE_INFINITY) { + duk_push_number(thr, DUK_DOUBLE_INFINITY); + return 1; + } else if (found_nan) { + duk_push_number(thr, DUK_DOUBLE_NAN); + return 1; + } else if (max == 0.0) { + duk_push_number(thr, 0.0); + /* Otherwise we'd divide by zero. */ + return 1; + } + + /* Use Kahan summation and normalize to the highest value to minimize + * floating point rounding error and avoid overflow. + * + * https://en.wikipedia.org/wiki/Kahan_summation_algorithm + */ + sum = 0.0; + comp = 0.0; + for (i = 0; i < nargs; i++) { + t = DUK_FABS(duk_get_number(thr, i)) / max; + summand = (t * t) - comp; + prelim = sum + summand; + comp = (prelim - sum) - summand; + sum = prelim; + } + + duk_push_number(thr, (duk_double_t) DUK_SQRT(sum) * max); + return 1; +} +#endif /* DUK_USE_ES6 */ + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_math_object_sign(duk_hthread *thr) { + duk_double_t d; + + d = duk_to_number(thr, 0); + if (duk_double_is_nan(d)) { + DUK_ASSERT(duk_is_nan(thr, -1)); + return 1; /* NaN input -> return NaN */ + } + if (d == 0.0) { + /* Zero sign kept, i.e. -0 -> -0, +0 -> +0. */ + return 1; + } + duk_push_int(thr, (d > 0.0 ? 1 : -1)); + return 1; +} +#endif /* DUK_USE_ES6 */ + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_math_object_clz32(duk_hthread *thr) { + duk_uint32_t x; + duk_small_uint_t i; + +#if defined(DUK_USE_PREFER_SIZE) + duk_uint32_t mask; + + x = duk_to_uint32(thr, 0); + for (i = 0, mask = 0x80000000UL; mask != 0; mask >>= 1) { + if (x & mask) { + break; + } + i++; + } + DUK_ASSERT(i <= 32); + duk_push_uint(thr, i); + return 1; +#else /* DUK_USE_PREFER_SIZE */ + i = 0; + x = duk_to_uint32(thr, 0); + if (x & 0xffff0000UL) { + x >>= 16; + } else { + i += 16; + } + if (x & 0x0000ff00UL) { + x >>= 8; + } else { + i += 8; + } + if (x & 0x000000f0UL) { + x >>= 4; + } else { + i += 4; + } + if (x & 0x0000000cUL) { + x >>= 2; + } else { + i += 2; + } + if (x & 0x00000002UL) { + x >>= 1; + } else { + i += 1; + } + if (x & 0x00000001UL) { + ; + } else { + i += 1; + } + DUK_ASSERT(i <= 32); + duk_push_uint(thr, i); + return 1; +#endif /* DUK_USE_PREFER_SIZE */ +} +#endif /* DUK_USE_ES6 */ + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_math_object_imul(duk_hthread *thr) { + duk_uint32_t x, y, z; + + x = duk_to_uint32(thr, 0); + y = duk_to_uint32(thr, 1); + z = x * y; + + /* While arguments are ToUint32() coerced and the multiplication + * is unsigned as such, the final result is curiously interpreted + * as a signed 32-bit value. + */ + duk_push_i32(thr, (duk_int32_t) z); + return 1; +} +#endif /* DUK_USE_ES6 */ + +#endif /* DUK_USE_MATH_BUILTIN */ +#line 1 "duk_bi_number.c" +/* + * Number built-ins + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_NUMBER_BUILTIN) + +DUK_LOCAL duk_double_t duk__push_this_number_plain(duk_hthread *thr) { + duk_hobject *h; + + /* Number built-in accepts a plain number or a Number object (whose + * internal value is operated on). Other types cause TypeError. + */ + + duk_push_this(thr); + if (duk_is_number(thr, -1)) { + DUK_DDD(DUK_DDDPRINT("plain number value: %!T", (duk_tval *) duk_get_tval(thr, -1))); + goto done; + } + h = duk_get_hobject(thr, -1); + if (!h || + (DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_NUMBER)) { + DUK_DDD(DUK_DDDPRINT("unacceptable this value: %!T", (duk_tval *) duk_get_tval(thr, -1))); + DUK_ERROR_TYPE(thr, "number expected"); + DUK_WO_NORETURN(return 0.0;); + } + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE); + DUK_ASSERT(duk_is_number(thr, -1)); + DUK_DDD(DUK_DDDPRINT("number object: %!T, internal value: %!T", + (duk_tval *) duk_get_tval(thr, -2), (duk_tval *) duk_get_tval(thr, -1))); + duk_remove_m2(thr); + + done: + return duk_get_number(thr, -1); +} + +DUK_INTERNAL duk_ret_t duk_bi_number_constructor(duk_hthread *thr) { + duk_idx_t nargs; + duk_hobject *h_this; + + /* + * The Number constructor uses ToNumber(arg) for number coercion + * (coercing an undefined argument to NaN). However, if the + * argument is not given at all, +0 must be used instead. To do + * this, a vararg function is used. + */ + + nargs = duk_get_top(thr); + if (nargs == 0) { + duk_push_int(thr, 0); + } + duk_to_number(thr, 0); + duk_set_top(thr, 1); + DUK_ASSERT_TOP(thr, 1); + + if (!duk_is_constructor_call(thr)) { + return 1; + } + + /* + * E5 Section 15.7.2.1 requires that the constructed object + * must have the original Number.prototype as its internal + * prototype. However, since Number.prototype is non-writable + * and non-configurable, this doesn't have to be enforced here: + * The default object (bound to 'this') is OK, though we have + * to change its class. + * + * Internal value set to ToNumber(arg) or +0; if no arg given, + * ToNumber(undefined) = NaN, so special treatment is needed + * (above). String internal value is immutable. + */ + + /* XXX: helper */ + duk_push_this(thr); + h_this = duk_known_hobject(thr, -1); + DUK_HOBJECT_SET_CLASS_NUMBER(h_this, DUK_HOBJECT_CLASS_NUMBER); + + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_this) == thr->builtins[DUK_BIDX_NUMBER_PROTOTYPE]); + DUK_ASSERT(DUK_HOBJECT_GET_CLASS_NUMBER(h_this) == DUK_HOBJECT_CLASS_NUMBER); + DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(h_this)); + + duk_dup_0(thr); /* -> [ val obj val ] */ + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE); + return 0; /* no return value -> don't replace created value */ +} + +DUK_INTERNAL duk_ret_t duk_bi_number_prototype_value_of(duk_hthread *thr) { + (void) duk__push_this_number_plain(thr); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_string(duk_hthread *thr) { + duk_small_int_t radix; + duk_small_uint_t n2s_flags; + + (void) duk__push_this_number_plain(thr); + if (duk_is_undefined(thr, 0)) { + radix = 10; + } else { + radix = (duk_small_int_t) duk_to_int_check_range(thr, 0, 2, 36); + } + DUK_DDD(DUK_DDDPRINT("radix=%ld", (long) radix)); + + n2s_flags = 0; + + duk_numconv_stringify(thr, + radix /*radix*/, + 0 /*digits*/, + n2s_flags /*flags*/); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_locale_string(duk_hthread *thr) { + /* XXX: just use toString() for now; permitted although not recommended. + * nargs==1, so radix is passed to toString(). + */ + return duk_bi_number_prototype_to_string(thr); +} + +/* + * toFixed(), toExponential(), toPrecision() + */ + +/* XXX: shared helper for toFixed(), toExponential(), toPrecision()? */ + +DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_fixed(duk_hthread *thr) { + duk_small_int_t frac_digits; + duk_double_t d; + duk_small_int_t c; + duk_small_uint_t n2s_flags; + + /* In ES5.1 frac_digits is coerced first; in ES2015 the 'this number + * value' check is done first. + */ + d = duk__push_this_number_plain(thr); + frac_digits = (duk_small_int_t) duk_to_int_check_range(thr, 0, 0, 20); + + c = (duk_small_int_t) DUK_FPCLASSIFY(d); + if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) { + goto use_to_string; + } + + if (d >= 1.0e21 || d <= -1.0e21) { + goto use_to_string; + } + + n2s_flags = DUK_N2S_FLAG_FIXED_FORMAT | + DUK_N2S_FLAG_FRACTION_DIGITS; + + duk_numconv_stringify(thr, + 10 /*radix*/, + frac_digits /*digits*/, + n2s_flags /*flags*/); + return 1; + + use_to_string: + DUK_ASSERT_TOP(thr, 2); + duk_to_string(thr, -1); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_exponential(duk_hthread *thr) { + duk_bool_t frac_undefined; + duk_small_int_t frac_digits; + duk_double_t d; + duk_small_int_t c; + duk_small_uint_t n2s_flags; + + d = duk__push_this_number_plain(thr); + + frac_undefined = duk_is_undefined(thr, 0); + duk_to_int(thr, 0); /* for side effects */ + + c = (duk_small_int_t) DUK_FPCLASSIFY(d); + if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) { + goto use_to_string; + } + + frac_digits = (duk_small_int_t) duk_to_int_check_range(thr, 0, 0, 20); + + n2s_flags = DUK_N2S_FLAG_FORCE_EXP | + (frac_undefined ? 0 : DUK_N2S_FLAG_FIXED_FORMAT); + + duk_numconv_stringify(thr, + 10 /*radix*/, + frac_digits + 1 /*leading digit + fractions*/, + n2s_flags /*flags*/); + return 1; + + use_to_string: + DUK_ASSERT_TOP(thr, 2); + duk_to_string(thr, -1); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_precision(duk_hthread *thr) { + /* The specification has quite awkward order of coercion and + * checks for toPrecision(). The operations below are a bit + * reordered, within constraints of observable side effects. + */ + + duk_double_t d; + duk_small_int_t prec; + duk_small_int_t c; + duk_small_uint_t n2s_flags; + + DUK_ASSERT_TOP(thr, 1); + + d = duk__push_this_number_plain(thr); + if (duk_is_undefined(thr, 0)) { + goto use_to_string; + } + DUK_ASSERT_TOP(thr, 2); + + duk_to_int(thr, 0); /* for side effects */ + + c = (duk_small_int_t) DUK_FPCLASSIFY(d); + if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) { + goto use_to_string; + } + + prec = (duk_small_int_t) duk_to_int_check_range(thr, 0, 1, 21); + + n2s_flags = DUK_N2S_FLAG_FIXED_FORMAT | + DUK_N2S_FLAG_NO_ZERO_PAD; + + duk_numconv_stringify(thr, + 10 /*radix*/, + prec /*digits*/, + n2s_flags /*flags*/); + return 1; + + use_to_string: + /* Used when precision is undefined; also used for NaN (-> "NaN"), + * and +/- infinity (-> "Infinity", "-Infinity"). + */ + + DUK_ASSERT_TOP(thr, 2); + duk_to_string(thr, -1); + return 1; +} + +/* + * ES2015 isFinite() etc + */ + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_number_check_shared(duk_hthread *thr) { + duk_int_t magic; + duk_bool_t ret = 0; + + if (duk_is_number(thr, 0)) { + duk_double_t d; + + magic = duk_get_current_magic(thr); + d = duk_get_number(thr, 0); + + switch (magic) { + case 0: /* isFinite() */ + ret = duk_double_is_finite(d); + break; + case 1: /* isInteger() */ + ret = duk_double_is_integer(d); + break; + case 2: /* isNaN() */ + ret = duk_double_is_nan(d); + break; + default: /* isSafeInteger() */ + DUK_ASSERT(magic == 3); + ret = duk_double_is_safe_integer(d); + } + } + + duk_push_boolean(thr, ret); + return 1; +} +#endif /* DUK_USE_ES6 */ + +#endif /* DUK_USE_NUMBER_BUILTIN */ +#line 1 "duk_bi_object.c" +/* + * Object built-ins + */ + +/* #include duk_internal.h -> already included */ + +/* Needed even when Object built-in disabled. */ +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_to_string(duk_hthread *thr) { + duk_tval *tv; + + tv = DUK_HTHREAD_THIS_PTR(thr); + duk_push_class_string_tval(thr, tv, 0 /*avoid_side_effects*/); + return 1; +} + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor(duk_hthread *thr) { + duk_uint_t arg_mask; + + arg_mask = duk_get_type_mask(thr, 0); + + if (!duk_is_constructor_call(thr) && /* not a constructor call */ + ((arg_mask & (DUK_TYPE_MASK_NULL | DUK_TYPE_MASK_UNDEFINED)) == 0)) { /* and argument not null or undefined */ + duk_to_object(thr, 0); + return 1; + } + + /* Pointer and buffer primitive values are treated like other + * primitives values which have a fully fledged object counterpart: + * promote to an object value. Lightfuncs and plain buffers are + * coerced with ToObject() even they could also be returned as is. + */ + if (arg_mask & (DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_STRING | + DUK_TYPE_MASK_BOOLEAN | + DUK_TYPE_MASK_NUMBER | + DUK_TYPE_MASK_POINTER | + DUK_TYPE_MASK_BUFFER | + DUK_TYPE_MASK_LIGHTFUNC)) { + /* For DUK_TYPE_OBJECT the coercion is a no-op and could + * be checked for explicitly, but Object(obj) calls are + * not very common so opt for minimal footprint. + */ + duk_to_object(thr, 0); + return 1; + } + + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), + DUK_BIDX_OBJECT_PROTOTYPE); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) && defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_assign(duk_hthread *thr) { + duk_idx_t nargs; + duk_int_t idx; + + nargs = duk_get_top_require_min(thr, 1 /*min_top*/); + + duk_to_object(thr, 0); + for (idx = 1; idx < nargs; idx++) { + /* E7 19.1.2.1 (step 4a) */ + if (duk_is_null_or_undefined(thr, idx)) { + continue; + } + + /* duk_enum() respects ES2015+ [[OwnPropertyKeys]] ordering, which is + * convenient here. + */ + duk_to_object(thr, idx); + duk_enum(thr, idx, DUK_ENUM_OWN_PROPERTIES_ONLY); + while (duk_next(thr, -1, 1 /*get_value*/)) { + /* [ target ... enum key value ] */ + duk_put_prop(thr, 0); + /* [ target ... enum ] */ + } + /* Could pop enumerator, but unnecessary because of duk_set_top() + * below. + */ + } + + duk_set_top(thr, 1); + return 1; +} +#endif + +#if defined(DUK_USE_OBJECT_BUILTIN) && defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_is(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 2); + duk_push_boolean(thr, duk_samevalue(thr, 0, 1)); + return 1; +} +#endif + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_create(duk_hthread *thr) { + duk_hobject *proto; + + DUK_ASSERT_TOP(thr, 2); + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + duk_hbufobj_promote_plain(thr, 0); +#endif + proto = duk_require_hobject_accept_mask(thr, 0, DUK_TYPE_MASK_NULL); + DUK_ASSERT(proto != NULL || duk_is_null(thr, 0)); + + (void) duk_push_object_helper_proto(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), + proto); + + if (!duk_is_undefined(thr, 1)) { + /* [ O Properties obj ] */ + + duk_replace(thr, 0); + + /* [ obj Properties ] */ + + /* Just call the "original" Object.defineProperties() to + * finish up. + */ + + return duk_bi_object_constructor_define_properties(thr); + } + + /* [ O Properties obj ] */ + + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_define_properties(duk_hthread *thr) { + duk_small_uint_t pass; + duk_uint_t defprop_flags; + duk_hobject *obj; + duk_idx_t idx_value; + duk_hobject *get; + duk_hobject *set; + + /* Lightfunc and plain buffer handling by ToObject() coercion. */ + obj = duk_require_hobject_promote_mask(thr, 0, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + DUK_ASSERT(obj != NULL); + + duk_to_object(thr, 1); /* properties object */ + + DUK_DDD(DUK_DDDPRINT("target=%!iT, properties=%!iT", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1))); + + /* + * Two pass approach to processing the property descriptors. + * On first pass validate and normalize all descriptors before + * any changes are made to the target object. On second pass + * make the actual modifications to the target object. + * + * Right now we'll just use the same normalize/validate helper + * on both passes, ignoring its outputs on the first pass. + */ + + for (pass = 0; pass < 2; pass++) { + duk_set_top(thr, 2); /* -> [ hobject props ] */ + duk_enum(thr, 1, DUK_ENUM_OWN_PROPERTIES_ONLY | DUK_ENUM_INCLUDE_SYMBOLS /*enum_flags*/); + + for (;;) { + duk_hstring *key; + + /* [ hobject props enum(props) ] */ + + duk_set_top(thr, 3); + + if (!duk_next(thr, 2, 1 /*get_value*/)) { + break; + } + + DUK_DDD(DUK_DDDPRINT("-> key=%!iT, desc=%!iT", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + + /* [ hobject props enum(props) key desc ] */ + + duk_hobject_prepare_property_descriptor(thr, + 4 /*idx_desc*/, + &defprop_flags, + &idx_value, + &get, + &set); + + /* [ hobject props enum(props) key desc [multiple values] ] */ + + if (pass == 0) { + continue; + } + + /* This allows symbols on purpose. */ + key = duk_known_hstring(thr, 3); + DUK_ASSERT(key != NULL); + + duk_hobject_define_property_helper(thr, + defprop_flags, + obj, + key, + idx_value, + get, + set, + 1 /*throw_flag*/); + } + } + + /* + * Return target object + */ + + duk_dup_0(thr); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_seal_freeze_shared(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 1); + + duk_seal_freeze_raw(thr, 0, (duk_bool_t) duk_get_current_magic(thr) /*is_freeze*/); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_is_sealed_frozen_shared(duk_hthread *thr) { + duk_hobject *h; + duk_bool_t is_frozen; + duk_uint_t mask; + + is_frozen = (duk_bool_t) duk_get_current_magic(thr); + mask = duk_get_type_mask(thr, 0); + if (mask & (DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER)) { + DUK_ASSERT(is_frozen == 0 || is_frozen == 1); + duk_push_boolean(thr, (mask & DUK_TYPE_MASK_LIGHTFUNC) ? + 1 : /* lightfunc always frozen and sealed */ + (is_frozen ^ 1)); /* buffer sealed but not frozen (index props writable) */ + } else { + /* ES2015 Sections 19.1.2.12, 19.1.2.13: anything other than an object + * is considered to be already sealed and frozen. + */ + h = duk_get_hobject(thr, 0); + duk_push_boolean(thr, (h == NULL) || + duk_hobject_object_is_sealed_frozen_helper(thr, h, is_frozen /*is_frozen*/)); + } + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_to_locale_string(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 0); + (void) duk_push_this_coercible_to_object(thr); + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_TO_STRING); +#if 0 /* This is mentioned explicitly in the E5.1 spec, but duk_call_method() checks for it in practice. */ + duk_require_callable(thr, 1); +#endif + duk_dup_0(thr); /* -> [ O toString O ] */ + duk_call_method(thr, 0); /* XXX: call method tail call? */ + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_value_of(duk_hthread *thr) { + /* For lightfuncs and plain buffers, returns Object() coerced. */ + (void) duk_push_this_coercible_to_object(thr); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_is_prototype_of(duk_hthread *thr) { + duk_hobject *h_v; + duk_hobject *h_obj; + + DUK_ASSERT_TOP(thr, 1); + + h_v = duk_get_hobject(thr, 0); + if (!h_v) { + duk_push_false(thr); /* XXX: tail call: return duk_push_false(thr) */ + return 1; + } + + h_obj = duk_push_this_coercible_to_object(thr); + DUK_ASSERT(h_obj != NULL); + + /* E5.1 Section 15.2.4.6, step 3.a, lookup proto once before compare. + * Prototype loops should cause an error to be thrown. + */ + duk_push_boolean(thr, duk_hobject_prototype_chain_contains(thr, DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_v), h_obj, 0 /*ignore_loop*/)); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_has_own_property(duk_hthread *thr) { + return (duk_ret_t) duk_hobject_object_ownprop_helper(thr, 0 /*required_desc_flags*/); +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_property_is_enumerable(duk_hthread *thr) { + return (duk_ret_t) duk_hobject_object_ownprop_helper(thr, DUK_PROPDESC_FLAG_ENUMERABLE /*required_desc_flags*/); +} +#endif /* DUK_USE_OBJECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +/* Shared helper to implement Object.getPrototypeOf, + * Object.prototype.__proto__ getter, and Reflect.getPrototypeOf. + * + * http://www.ecma-international.org/ecma-262/6.0/index.html#sec-get-object.prototype.__proto__ + */ +DUK_INTERNAL duk_ret_t duk_bi_object_getprototype_shared(duk_hthread *thr) { + /* + * magic = 0: __proto__ getter + * magic = 1: Object.getPrototypeOf() + * magic = 2: Reflect.getPrototypeOf() + */ + + duk_hobject *h; + duk_hobject *proto; + duk_tval *tv; + duk_int_t magic; + + magic = duk_get_current_magic(thr); + + if (magic == 0) { + DUK_ASSERT_TOP(thr, 0); + duk_push_this_coercible_to_object(thr); + } + DUK_ASSERT(duk_get_top(thr) >= 1); + if (magic < 2) { + /* ES2015 Section 19.1.2.9, step 1 */ + duk_to_object(thr, 0); + } + tv = DUK_GET_TVAL_POSIDX(thr, 0); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_BUFFER: + proto = thr->builtins[DUK_BIDX_UINT8ARRAY_PROTOTYPE]; + break; + case DUK_TAG_LIGHTFUNC: + proto = thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]; + break; + case DUK_TAG_OBJECT: + h = DUK_TVAL_GET_OBJECT(tv); + proto = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h); + break; + default: + /* This implicitly handles CheckObjectCoercible() caused + * TypeError. + */ + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + if (proto != NULL) { + duk_push_hobject(thr, proto); + } else { + duk_push_null(thr); + } + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +/* Shared helper to implement ES2015 Object.setPrototypeOf, + * Object.prototype.__proto__ setter, and Reflect.setPrototypeOf. + * + * http://www.ecma-international.org/ecma-262/6.0/index.html#sec-get-object.prototype.__proto__ + * http://www.ecma-international.org/ecma-262/6.0/index.html#sec-object.setprototypeof + */ +DUK_INTERNAL duk_ret_t duk_bi_object_setprototype_shared(duk_hthread *thr) { + /* + * magic = 0: __proto__ setter + * magic = 1: Object.setPrototypeOf() + * magic = 2: Reflect.setPrototypeOf() + */ + + duk_hobject *h_obj; + duk_hobject *h_new_proto; + duk_hobject *h_curr; + duk_ret_t ret_success = 1; /* retval for success path */ + duk_uint_t mask; + duk_int_t magic; + + /* Preliminaries for __proto__ and setPrototypeOf (E6 19.1.2.18 steps 1-4). */ + magic = duk_get_current_magic(thr); + if (magic == 0) { + duk_push_this_check_object_coercible(thr); + duk_insert(thr, 0); + if (!duk_check_type_mask(thr, 1, DUK_TYPE_MASK_NULL | DUK_TYPE_MASK_OBJECT)) { + return 0; + } + + /* __proto__ setter returns 'undefined' on success unlike the + * setPrototypeOf() call which returns the target object. + */ + ret_success = 0; + } else { + if (magic == 1) { + duk_require_object_coercible(thr, 0); + } else { + duk_require_hobject_accept_mask(thr, 0, + DUK_TYPE_MASK_LIGHTFUNC | + DUK_TYPE_MASK_BUFFER); + } + duk_require_type_mask(thr, 1, DUK_TYPE_MASK_NULL | DUK_TYPE_MASK_OBJECT); + } + + h_new_proto = duk_get_hobject(thr, 1); + /* h_new_proto may be NULL */ + + mask = duk_get_type_mask(thr, 0); + if (mask & (DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER)) { + duk_hobject *curr_proto; + curr_proto = thr->builtins[(mask & DUK_TYPE_MASK_LIGHTFUNC) ? + DUK_BIDX_FUNCTION_PROTOTYPE : + DUK_BIDX_UINT8ARRAY_PROTOTYPE]; + if (h_new_proto == curr_proto) { + goto skip; + } + goto fail_nonextensible; + } + h_obj = duk_get_hobject(thr, 0); + if (h_obj == NULL) { + goto skip; + } + DUK_ASSERT(h_obj != NULL); + + /* [[SetPrototypeOf]] standard behavior, E6 9.1.2. */ + /* TODO: implement Proxy object support here */ + + if (h_new_proto == DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_obj)) { + goto skip; + } + if (!DUK_HOBJECT_HAS_EXTENSIBLE(h_obj)) { + goto fail_nonextensible; + } + for (h_curr = h_new_proto; h_curr != NULL; h_curr = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_curr)) { + /* Loop prevention. */ + if (h_curr == h_obj) { + goto fail_loop; + } + } + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, h_obj, h_new_proto); + /* fall thru */ + + skip: + duk_set_top(thr, 1); + if (magic == 2) { + duk_push_true(thr); + } + return ret_success; + + fail_nonextensible: + fail_loop: + if (magic != 2) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } else { + duk_push_false(thr); + return 1; + } +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_define_property(duk_hthread *thr) { + /* + * magic = 0: Object.defineProperty() + * magic = 1: Reflect.defineProperty() + */ + + duk_hobject *obj; + duk_hstring *key; + duk_hobject *get; + duk_hobject *set; + duk_idx_t idx_value; + duk_uint_t defprop_flags; + duk_small_uint_t magic; + duk_bool_t throw_flag; + duk_bool_t ret; + + DUK_ASSERT(thr != NULL); + + DUK_DDD(DUK_DDDPRINT("Object.defineProperty(): ctx=%p obj=%!T key=%!T desc=%!T", + (void *) thr, + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1), + (duk_tval *) duk_get_tval(thr, 2))); + + /* [ obj key desc ] */ + + magic = (duk_small_uint_t) duk_get_current_magic(thr); + + /* Lightfuncs are currently supported by coercing to a temporary + * Function object; changes will be allowed (the coerced value is + * extensible) but will be lost. Same for plain buffers. + */ + obj = duk_require_hobject_promote_mask(thr, 0, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + DUK_ASSERT(obj != NULL); + key = duk_to_property_key_hstring(thr, 1); + (void) duk_require_hobject(thr, 2); + + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(duk_get_hobject(thr, 2) != NULL); + + /* + * Validate and convert argument property descriptor (an ECMAScript + * object) into a set of defprop_flags and possibly property value, + * getter, and/or setter values on the value stack. + * + * Lightfunc set/get values are coerced to full Functions. + */ + + duk_hobject_prepare_property_descriptor(thr, + 2 /*idx_desc*/, + &defprop_flags, + &idx_value, + &get, + &set); + + /* + * Use Object.defineProperty() helper for the actual operation. + */ + + DUK_ASSERT(magic == 0U || magic == 1U); + throw_flag = magic ^ 1U; + ret = duk_hobject_define_property_helper(thr, + defprop_flags, + obj, + key, + idx_value, + get, + set, + throw_flag); + + /* Ignore the normalize/validate helper outputs on the value stack, + * they're popped automatically. + */ + + if (magic == 0U) { + /* Object.defineProperty(): return target object. */ + duk_push_hobject(thr, obj); + } else { + /* Reflect.defineProperty(): return success/fail. */ + duk_push_boolean(thr, ret); + } + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_get_own_property_descriptor(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 2); + + /* ES2015 Section 19.1.2.6, step 1 */ + if (duk_get_current_magic(thr) == 0) { + duk_to_object(thr, 0); + } + + /* [ obj key ] */ + + duk_hobject_object_get_own_property_descriptor(thr, -2); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_is_extensible(duk_hthread *thr) { + /* + * magic = 0: Object.isExtensible() + * magic = 1: Reflect.isExtensible() + */ + + duk_hobject *h; + + if (duk_get_current_magic(thr) == 0) { + h = duk_get_hobject(thr, 0); + } else { + /* Reflect.isExtensible(): throw if non-object, but we accept lightfuncs + * and plain buffers here because they pretend to be objects. + */ + h = duk_require_hobject_accept_mask(thr, 0, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + } + + duk_push_boolean(thr, (h != NULL) && DUK_HOBJECT_HAS_EXTENSIBLE(h)); + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +/* Shared helper for various key/symbol listings, magic: + * 0=Object.keys() + * 1=Object.getOwnPropertyNames(), + * 2=Object.getOwnPropertySymbols(), + * 3=Reflect.ownKeys() + */ +DUK_LOCAL const duk_small_uint_t duk__object_keys_enum_flags[4] = { + /* Object.keys() */ + DUK_ENUM_OWN_PROPERTIES_ONLY | + DUK_ENUM_NO_PROXY_BEHAVIOR, + + /* Object.getOwnPropertyNames() */ + DUK_ENUM_INCLUDE_NONENUMERABLE | + DUK_ENUM_OWN_PROPERTIES_ONLY | + DUK_ENUM_NO_PROXY_BEHAVIOR, + + /* Object.getOwnPropertySymbols() */ + DUK_ENUM_INCLUDE_SYMBOLS | + DUK_ENUM_OWN_PROPERTIES_ONLY | + DUK_ENUM_EXCLUDE_STRINGS | + DUK_ENUM_INCLUDE_NONENUMERABLE | + DUK_ENUM_NO_PROXY_BEHAVIOR, + + /* Reflect.ownKeys() */ + DUK_ENUM_INCLUDE_SYMBOLS | + DUK_ENUM_OWN_PROPERTIES_ONLY | + DUK_ENUM_INCLUDE_NONENUMERABLE | + DUK_ENUM_NO_PROXY_BEHAVIOR +}; + +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_keys_shared(duk_hthread *thr) { + duk_hobject *obj; +#if defined(DUK_USE_ES6_PROXY) + duk_hobject *h_proxy_target; + duk_hobject *h_proxy_handler; + duk_hobject *h_trap_result; +#endif + duk_small_uint_t enum_flags; + duk_int_t magic; + + DUK_ASSERT_TOP(thr, 1); + + magic = duk_get_current_magic(thr); + if (magic == 3) { + /* ES2015 Section 26.1.11 requires a TypeError for non-objects. Lightfuncs + * and plain buffers pretend to be objects, so accept those too. + */ + obj = duk_require_hobject_promote_mask(thr, 0, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + } else { + /* ES2015: ToObject coerce. */ + obj = duk_to_hobject(thr, 0); + } + DUK_ASSERT(obj != NULL); + DUK_UNREF(obj); + + /* XXX: proxy chains */ + +#if defined(DUK_USE_ES6_PROXY) + /* XXX: better sharing of code between proxy target call sites */ + if (DUK_LIKELY(!duk_hobject_proxy_check(obj, + &h_proxy_target, + &h_proxy_handler))) { + goto skip_proxy; + } + + duk_push_hobject(thr, h_proxy_handler); + if (!duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_OWN_KEYS)) { + /* Careful with reachability here: don't pop 'obj' before pushing + * proxy target. + */ + DUK_DDD(DUK_DDDPRINT("no ownKeys trap, get keys of target instead")); + duk_pop_2(thr); + duk_push_hobject(thr, h_proxy_target); + duk_replace(thr, 0); + DUK_ASSERT_TOP(thr, 1); + goto skip_proxy; + } + + /* [ obj handler trap ] */ + duk_insert(thr, -2); + duk_push_hobject(thr, h_proxy_target); /* -> [ obj trap handler target ] */ + duk_call_method(thr, 1 /*nargs*/); /* -> [ obj trap_result ] */ + h_trap_result = duk_require_hobject(thr, -1); + DUK_UNREF(h_trap_result); + + magic = duk_get_current_magic(thr); + DUK_ASSERT(magic >= 0 && magic < (duk_int_t) (sizeof(duk__object_keys_enum_flags) / sizeof(duk_small_uint_t))); + enum_flags = duk__object_keys_enum_flags[magic]; + + duk_proxy_ownkeys_postprocess(thr, h_proxy_target, enum_flags); + return 1; + + skip_proxy: +#endif /* DUK_USE_ES6_PROXY */ + + DUK_ASSERT_TOP(thr, 1); + magic = duk_get_current_magic(thr); + DUK_ASSERT(magic >= 0 && magic < (duk_int_t) (sizeof(duk__object_keys_enum_flags) / sizeof(duk_small_uint_t))); + enum_flags = duk__object_keys_enum_flags[magic]; + return duk_hobject_get_enumerated_keys(thr, enum_flags); +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +#if defined(DUK_USE_OBJECT_BUILTIN) || defined(DUK_USE_REFLECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_object_constructor_prevent_extensions(duk_hthread *thr) { + /* + * magic = 0: Object.preventExtensions() + * magic = 1: Reflect.preventExtensions() + */ + + duk_hobject *h; + duk_uint_t mask; + duk_int_t magic; + + magic = duk_get_current_magic(thr); + + /* Silent success for lightfuncs and plain buffers always. */ + mask = DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER; + + /* Object.preventExtensions() silent success for non-object. */ + if (magic == 0) { + mask |= DUK_TYPE_MASK_UNDEFINED | + DUK_TYPE_MASK_NULL | + DUK_TYPE_MASK_BOOLEAN | + DUK_TYPE_MASK_NUMBER | + DUK_TYPE_MASK_STRING | + DUK_TYPE_MASK_POINTER; + } + + if (duk_check_type_mask(thr, 0, mask)) { + /* Not an object, already non-extensible so always success. */ + goto done; + } + h = duk_require_hobject(thr, 0); + DUK_ASSERT(h != NULL); + + DUK_HOBJECT_CLEAR_EXTENSIBLE(h); + + /* A non-extensible object cannot gain any more properties, + * so this is a good time to compact. + */ + duk_hobject_compact_props(thr, h); + + done: + if (magic == 1) { + duk_push_true(thr); + } + return 1; +} +#endif /* DUK_USE_OBJECT_BUILTIN || DUK_USE_REFLECT_BUILTIN */ + +/* + * __defineGetter__, __defineSetter__, __lookupGetter__, __lookupSetter__ + */ + +#if defined(DUK_USE_ES8) +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_defineaccessor(duk_hthread *thr) { + duk_push_this(thr); + duk_insert(thr, 0); + duk_to_object(thr, 0); + duk_require_callable(thr, 2); + + /* [ ToObject(this) key getter/setter ] */ + + /* ToPropertyKey() coercion is not needed, duk_def_prop() does it. */ + duk_def_prop(thr, 0, DUK_DEFPROP_SET_ENUMERABLE | + DUK_DEFPROP_SET_CONFIGURABLE | + (duk_get_current_magic(thr) ? DUK_DEFPROP_HAVE_SETTER : DUK_DEFPROP_HAVE_GETTER)); + return 0; +} +DUK_INTERNAL duk_ret_t duk_bi_object_prototype_lookupaccessor(duk_hthread *thr) { + duk_uint_t sanity; + + duk_push_this(thr); + duk_to_object(thr, -1); + + /* XXX: Prototype walk (with sanity) should be a core property + * operation, could add a flag to e.g. duk_get_prop_desc(). + */ + + /* ToPropertyKey() coercion is not needed, duk_get_prop_desc() does it. */ + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + while (!duk_is_undefined(thr, -1)) { + /* [ key obj ] */ + duk_dup(thr, 0); + duk_get_prop_desc(thr, 1, 0 /*flags*/); + if (!duk_is_undefined(thr, -1)) { + duk_get_prop_stridx(thr, -1, (duk_get_current_magic(thr) != 0 ? DUK_STRIDX_SET : DUK_STRIDX_GET)); + return 1; + } + duk_pop(thr); + + if (DUK_UNLIKELY(sanity-- == 0)) { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + + duk_get_prototype(thr, -1); + duk_remove(thr, -2); + } + return 1; +} +#endif /* DUK_USE_ES8 */ +#line 1 "duk_bi_performance.c" +/* + * High resolution time API (performance.now() et al) + * + * API specification: https://encoding.spec.whatwg.org/#ap://www.w3.org/TR/hr-time/ + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_PERFORMANCE_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_performance_now(duk_hthread *thr) { + /* From API spec: + * The DOMHighResTimeStamp type is used to store a time value in + * milliseconds, measured relative from the time origin, global + * monotonic clock, or a time value that represents a duration + * between two DOMHighResTimeStamp's. + */ + duk_push_number(thr, duk_time_get_monotonic_time(thr)); + return 1; +} + +#if 0 /* Missing until semantics decided. */ +DUK_INTERNAL duk_ret_t duk_bi_performance_timeorigin_getter(duk_hthread *thr) { + /* No decision yet how to handle timeOrigins, e.g. should one be + * initialized per heap, or per global object set. See + * https://www.w3.org/TR/hr-time/#time-origin. + */ + duk_push_uint(thr, 0); + return 1; +} +#endif /* 0 */ +#endif /* DUK_USE_PERFORMANCE_BUILTIN */ +#line 1 "duk_bi_pointer.c" +/* + * Pointer built-ins + */ + +/* #include duk_internal.h -> already included */ + +/* + * Constructor + */ + +DUK_INTERNAL duk_ret_t duk_bi_pointer_constructor(duk_hthread *thr) { + /* XXX: this behavior is quite useless now; it would be nice to be able + * to create pointer values from e.g. numbers or strings. Numbers are + * problematic on 64-bit platforms though. Hex encoded strings? + */ + if (duk_get_top(thr) == 0) { + duk_push_pointer(thr, NULL); + } else { + duk_to_pointer(thr, 0); + } + DUK_ASSERT(duk_is_pointer(thr, 0)); + duk_set_top(thr, 1); + + if (duk_is_constructor_call(thr)) { + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_POINTER), + DUK_BIDX_POINTER_PROTOTYPE); + + /* Pointer object internal value is immutable */ + duk_dup_0(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE); + } + /* Note: unbalanced stack on purpose */ + + return 1; +} + +/* + * toString(), valueOf() + */ + +DUK_INTERNAL duk_ret_t duk_bi_pointer_prototype_tostring_shared(duk_hthread *thr) { + duk_tval *tv; + duk_small_int_t to_string = duk_get_current_magic(thr); + + duk_push_this(thr); + tv = duk_require_tval(thr, -1); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_POINTER(tv)) { + /* nop */ + } else if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + /* Must be a "pointer object", i.e. class "Pointer" */ + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_POINTER) { + goto type_error; + } + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE); + } else { + goto type_error; + } + + if (to_string) { + duk_to_string(thr, -1); + } + return 1; + + type_error: + DUK_DCERROR_TYPE_INVALID_ARGS(thr); +} +#line 1 "duk_bi_promise.c" +/* + * Promise built-in + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_PROMISE_BUILTIN) + +DUK_INTERNAL duk_ret_t duk_bi_promise_constructor(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_ret_t duk_bi_promise_all(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_ret_t duk_bi_promise_race(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_ret_t duk_bi_promise_reject(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_ret_t duk_bi_promise_resolve(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_ret_t duk_bi_promise_catch(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL duk_ret_t duk_bi_promise_then(duk_hthread *thr) { + DUK_ERROR_TYPE(thr, "unimplemented"); + DUK_WO_NORETURN(return 0;); +} + +#endif /* DUK_USE_PROMISE_BUILTIN */ +#line 1 "duk_bi_proxy.c" +/* + * Proxy built-in (ES2015) + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_ES6_PROXY) +/* Post-process a Proxy ownKeys() result at stack top. Push a cleaned up + * array of valid result keys (strings or symbols). TypeError for invalid + * values. Flags are shared with duk_enum(). + */ +DUK_INTERNAL void duk_proxy_ownkeys_postprocess(duk_hthread *thr, duk_hobject *h_proxy_target, duk_uint_t flags) { + duk_uarridx_t i, len, idx; + duk_propdesc desc; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(h_proxy_target != NULL); + + len = (duk_uarridx_t) duk_get_length(thr, -1); + idx = 0; + duk_push_array(thr); + /* XXX: preallocated dense array, fill in directly */ + for (i = 0; i < len; i++) { + duk_hstring *h; + + /* [ obj trap_result res_arr ] */ + (void) duk_get_prop_index(thr, -2, i); + h = duk_get_hstring(thr, -1); + if (h == NULL) { + DUK_ERROR_TYPE_INVALID_TRAP_RESULT(thr); + DUK_WO_NORETURN(return;); + } + + if (!(flags & DUK_ENUM_INCLUDE_NONENUMERABLE)) { + /* No support for 'getOwnPropertyDescriptor' trap yet, + * so check enumerability always from target object + * descriptor. + */ + if (duk_hobject_get_own_propdesc(thr, h_proxy_target, duk_known_hstring(thr, -1), &desc, 0 /*flags*/)) { + if ((desc.flags & DUK_PROPDESC_FLAG_ENUMERABLE) == 0) { + DUK_DDD(DUK_DDDPRINT("ignore non-enumerable property: %!T", duk_get_tval(thr, -1))); + goto skip_key; + } + } else { + DUK_DDD(DUK_DDDPRINT("ignore non-existent property: %!T", duk_get_tval(thr, -1))); + goto skip_key; + } + } + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + if (!(flags & DUK_ENUM_INCLUDE_SYMBOLS)) { + DUK_DDD(DUK_DDDPRINT("ignore symbol property: %!T", duk_get_tval(thr, -1))); + goto skip_key; + } + if (DUK_HSTRING_HAS_HIDDEN(h) && !(flags & DUK_ENUM_INCLUDE_HIDDEN)) { + DUK_DDD(DUK_DDDPRINT("ignore hidden symbol property: %!T", duk_get_tval(thr, -1))); + goto skip_key; + } + } else { + if (flags & DUK_ENUM_EXCLUDE_STRINGS) { + DUK_DDD(DUK_DDDPRINT("ignore string property: %!T", duk_get_tval(thr, -1))); + goto skip_key; + } + } + + /* [ obj trap_result res_arr propname ] */ + duk_put_prop_index(thr, -2, idx++); + continue; + + skip_key: + duk_pop(thr); + continue; + } + + /* XXX: Missing trap result validation for non-configurable target keys + * (must be present), for non-extensible target all target keys must be + * present and no extra keys can be present. + * http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys + */ + + /* XXX: The key enumerability check should trigger the "getOwnPropertyDescriptor" + * trap which has not yet been implemented. In the absence of such a trap, + * the enumerability should be checked from the target object; this is + * handled above. + */ +} +#endif /* DUK_USE_ES6_PROXY */ + +#if defined(DUK_USE_ES6_PROXY) +DUK_INTERNAL duk_ret_t duk_bi_proxy_constructor(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 2); /* [ target handler ] */ + + duk_require_constructor_call(thr); + duk_push_proxy(thr, 0 /*flags*/); /* [ target handler ] -> [ proxy ] */ + return 1; /* replacement */ +} +#endif /* DUK_USE_ES6_PROXY */ +#line 1 "duk_bi_reflect.c" +/* + * 'Reflect' built-in (ES2016 Section 26.1) + * http://www.ecma-international.org/ecma-262/7.0/#sec-reflect-object + * + * Many Reflect built-in functions are provided by shared helpers in + * duk_bi_object.c or duk_bi_function.c. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_REFLECT_BUILTIN) +DUK_INTERNAL duk_ret_t duk_bi_reflect_object_delete_property(duk_hthread *thr) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t ret; + + DUK_ASSERT_TOP(thr, 2); + (void) duk_require_hobject(thr, 0); + (void) duk_to_string(thr, 1); + + /* [ target key ] */ + + DUK_ASSERT(thr != NULL); + tv_obj = DUK_GET_TVAL_POSIDX(thr, 0); + tv_key = DUK_GET_TVAL_POSIDX(thr, 1); + ret = duk_hobject_delprop(thr, tv_obj, tv_key, 0 /*throw_flag*/); + duk_push_boolean(thr, ret); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_reflect_object_get(duk_hthread *thr) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_idx_t nargs; + + DUK_ASSERT(thr != NULL); + nargs = duk_get_top_require_min(thr, 2 /*min_top*/); + (void) duk_require_hobject(thr, 0); + (void) duk_to_string(thr, 1); + if (nargs >= 3 && !duk_strict_equals(thr, 0, 2)) { + /* XXX: [[Get]] receiver currently unsupported */ + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return 0;); + } + + /* [ target key receiver? ...? ] */ + + tv_obj = DUK_GET_TVAL_POSIDX(thr, 0); + tv_key = DUK_GET_TVAL_POSIDX(thr, 1); + (void) duk_hobject_getprop(thr, tv_obj, tv_key); /* This could also be a duk_get_prop(). */ + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_reflect_object_has(duk_hthread *thr) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t ret; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT_TOP(thr, 2); + (void) duk_require_hobject(thr, 0); + (void) duk_to_string(thr, 1); + + /* [ target key ] */ + + tv_obj = DUK_GET_TVAL_POSIDX(thr, 0); + tv_key = DUK_GET_TVAL_POSIDX(thr, 1); + ret = duk_hobject_hasprop(thr, tv_obj, tv_key); + duk_push_boolean(thr, ret); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_reflect_object_set(duk_hthread *thr) { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_tval *tv_val; + duk_idx_t nargs; + duk_bool_t ret; + + DUK_ASSERT(thr != NULL); + nargs = duk_get_top_require_min(thr, 3 /*min_top*/); + (void) duk_require_hobject(thr, 0); + (void) duk_to_string(thr, 1); + if (nargs >= 4 && !duk_strict_equals(thr, 0, 3)) { + /* XXX: [[Set]] receiver currently unsupported */ + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return 0;); + } + + /* [ target key value receiver? ...? ] */ + + tv_obj = DUK_GET_TVAL_POSIDX(thr, 0); + tv_key = DUK_GET_TVAL_POSIDX(thr, 1); + tv_val = DUK_GET_TVAL_POSIDX(thr, 2); + ret = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, 0 /*throw_flag*/); + duk_push_boolean(thr, ret); + return 1; +} +#endif /* DUK_USE_REFLECT_BUILTIN */ +#line 1 "duk_bi_regexp.c" +/* + * RegExp built-ins + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_REGEXP_SUPPORT) + +DUK_LOCAL void duk__get_this_regexp(duk_hthread *thr) { + duk_hobject *h; + + duk_push_this(thr); + h = duk_require_hobject_with_class(thr, -1, DUK_HOBJECT_CLASS_REGEXP); + DUK_ASSERT(h != NULL); + DUK_UNREF(h); + duk_insert(thr, 0); /* prepend regexp to valstack 0 index */ +} + +/* XXX: much to improve (code size) */ +DUK_INTERNAL duk_ret_t duk_bi_regexp_constructor(duk_hthread *thr) { + duk_hobject *h_pattern; + + DUK_ASSERT_TOP(thr, 2); + h_pattern = duk_get_hobject(thr, 0); + + if (!duk_is_constructor_call(thr) && + h_pattern != NULL && + DUK_HOBJECT_GET_CLASS_NUMBER(h_pattern) == DUK_HOBJECT_CLASS_REGEXP && + duk_is_undefined(thr, 1)) { + /* Called as a function, pattern has [[Class]] "RegExp" and + * flags is undefined -> return object as is. + */ + /* XXX: ES2015 has a NewTarget SameValue() check which is not + * yet implemented. + */ + duk_dup_0(thr); + return 1; + } + + /* Else functionality is identical for function call and constructor + * call. + */ + + if (h_pattern != NULL && + DUK_HOBJECT_GET_CLASS_NUMBER(h_pattern) == DUK_HOBJECT_CLASS_REGEXP) { + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_SOURCE); + if (duk_is_undefined(thr, 1)) { + /* In ES5 one would need to read the flags individually; + * in ES2015 just read .flags. + */ + duk_get_prop_stridx(thr, 0, DUK_STRIDX_FLAGS); + } else { + /* In ES2015 allowed; overrides argument RegExp flags. */ + duk_dup_1(thr); + } + } else { + if (duk_is_undefined(thr, 0)) { + duk_push_hstring_empty(thr); + } else { + duk_dup_0(thr); + duk_to_string(thr, -1); /* Rejects Symbols. */ + } + if (duk_is_undefined(thr, 1)) { + duk_push_hstring_empty(thr); + } else { + duk_dup_1(thr); + duk_to_string(thr, -1); /* Rejects Symbols. */ + } + + /* [ ... pattern flags ] */ + } + + DUK_DDD(DUK_DDDPRINT("RegExp constructor/function call, pattern=%!T, flags=%!T", + (duk_tval *) duk_get_tval(thr, -2), (duk_tval *) duk_get_tval(thr, -1))); + + /* [ ... pattern flags ] (both uncoerced) */ + + duk_to_string(thr, -2); + duk_to_string(thr, -1); + duk_regexp_compile(thr); + + /* [ ... bytecode escaped_source ] */ + + duk_regexp_create_instance(thr); + + /* [ ... RegExp ] */ + + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_regexp_prototype_exec(duk_hthread *thr) { + duk__get_this_regexp(thr); + + /* [ regexp input ] */ + + duk_regexp_match(thr); + + /* [ result ] */ + + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_regexp_prototype_test(duk_hthread *thr) { + duk__get_this_regexp(thr); + + /* [ regexp input ] */ + + /* result object is created and discarded; wasteful but saves code space */ + duk_regexp_match(thr); + + /* [ result ] */ + + duk_push_boolean(thr, (duk_is_null(thr, -1) ? 0 : 1)); + + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_regexp_prototype_tostring(duk_hthread *thr) { + /* This must be generic in ES2015 and later. */ + DUK_ASSERT_TOP(thr, 0); + duk_push_this(thr); + duk_push_literal(thr, "/"); + duk_get_prop_stridx(thr, 0, DUK_STRIDX_SOURCE); + duk_dup_m2(thr); /* another "/" */ + duk_get_prop_stridx(thr, 0, DUK_STRIDX_FLAGS); + duk_concat(thr, 4); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_regexp_prototype_flags(duk_hthread *thr) { + /* .flags is ES2015 but present even when ES2015 bindings are + * disabled because the constructor relies on it. + */ + duk_uint8_t buf[8]; /* enough for all flags + NUL */ + duk_uint8_t *p = buf; + + /* .flags is generic and works on any object. */ + duk_push_this(thr); + (void) duk_require_hobject(thr, -1); + if (duk_get_prop_stridx_boolean(thr, 0, DUK_STRIDX_GLOBAL, NULL)) { + *p++ = DUK_ASC_LC_G; + } + if (duk_get_prop_stridx_boolean(thr, 0, DUK_STRIDX_IGNORE_CASE, NULL)) { + *p++ = DUK_ASC_LC_I; + } + if (duk_get_prop_stridx_boolean(thr, 0, DUK_STRIDX_MULTILINE, NULL)) { + *p++ = DUK_ASC_LC_M; + } + /* .unicode: to be added */ + /* .sticky: to be added */ + *p++ = DUK_ASC_NUL; + DUK_ASSERT((duk_size_t) (p - buf) <= sizeof(buf)); + + duk_push_string(thr, (const char *) buf); + return 1; +} + +/* Shared helper for providing .source, .global, .multiline, etc getters. */ +DUK_INTERNAL duk_ret_t duk_bi_regexp_prototype_shared_getter(duk_hthread *thr) { + duk_hstring *h_bc; + duk_small_uint_t re_flags; + duk_hobject *h; + duk_int_t magic; + + DUK_ASSERT_TOP(thr, 0); + + duk_push_this(thr); + h = duk_require_hobject(thr, -1); + magic = duk_get_current_magic(thr); + + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) == DUK_HOBJECT_CLASS_REGEXP) { + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_INT_SOURCE); + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_INT_BYTECODE); + h_bc = duk_require_hstring(thr, -1); + re_flags = (duk_small_uint_t) DUK_HSTRING_GET_DATA(h_bc)[0]; /* Safe even if h_bc length is 0 (= NUL) */ + duk_pop(thr); + } else if (h == thr->builtins[DUK_BIDX_REGEXP_PROTOTYPE]) { + /* In ES2015 and ES2016 a TypeError would be thrown here. + * However, this had real world issues so ES2017 draft + * allows RegExp.prototype specifically, returning '(?:)' + * for .source and undefined for all flags. + */ + if (magic != 16 /* .source */) { + return 0; + } + duk_push_literal(thr, "(?:)"); /* .source handled by switch-case */ + re_flags = 0; + } else { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); + } + + /* [ regexp source ] */ + + switch (magic) { + case 0: { /* global */ + duk_push_boolean(thr, (re_flags & DUK_RE_FLAG_GLOBAL)); + break; + } + case 1: { /* ignoreCase */ + duk_push_boolean(thr, (re_flags & DUK_RE_FLAG_IGNORE_CASE)); + break; + } + case 2: { /* multiline */ + duk_push_boolean(thr, (re_flags & DUK_RE_FLAG_MULTILINE)); + break; + } +#if 0 + /* Don't provide until implemented to avoid interfering with feature + * detection in user code. + */ + case 3: /* sticky */ + case 4: { /* unicode */ + duk_push_false(thr); + break; + } +#endif + default: { /* source */ + /* leave 'source' on top */ + break; + } + } + + return 1; +} + +#endif /* DUK_USE_REGEXP_SUPPORT */ +#line 1 "duk_bi_string.c" +/* + * String built-ins + * + * Most String built-ins must only accept strings (or String objects). + * Symbols, represented internally as strings, must be generally rejected. + * The duk_push_this_coercible_to_string() helper does this automatically. + */ + +/* XXX: There are several limitations in the current implementation for + * strings with >= 0x80000000UL characters. In some cases one would need + * to be able to represent the range [-0xffffffff,0xffffffff] and so on. + * Generally character and byte length are assumed to fit into signed 32 + * bits (< 0x80000000UL). Places with issues are not marked explicitly + * below in all cases, look for signed type usage (duk_int_t etc) for + * offsets/lengths. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_STRING_BUILTIN) + +/* + * Helpers + */ + +DUK_LOCAL duk_hstring *duk__str_tostring_notregexp(duk_hthread *thr, duk_idx_t idx) { + duk_hstring *h; + + if (duk_get_class_number(thr, idx) == DUK_HOBJECT_CLASS_REGEXP) { + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return NULL;); + } + h = duk_to_hstring(thr, idx); + DUK_ASSERT(h != NULL); + + return h; +} + +DUK_LOCAL duk_int_t duk__str_search_shared(duk_hthread *thr, duk_hstring *h_this, duk_hstring *h_search, duk_int_t start_cpos, duk_bool_t backwards) { + duk_int_t cpos; + duk_int_t bpos; + const duk_uint8_t *p_start, *p_end, *p; + const duk_uint8_t *q_start; + duk_int_t q_blen; + duk_uint8_t firstbyte; + duk_uint8_t t; + + cpos = start_cpos; + + /* Empty searchstring always matches; cpos must be clamped here. + * (If q_blen were < 0 due to clamped coercion, it would also be + * caught here.) + */ + q_start = DUK_HSTRING_GET_DATA(h_search); + q_blen = (duk_int_t) DUK_HSTRING_GET_BYTELEN(h_search); + if (q_blen <= 0) { + return cpos; + } + DUK_ASSERT(q_blen > 0); + + bpos = (duk_int_t) duk_heap_strcache_offset_char2byte(thr, h_this, (duk_uint32_t) cpos); + + p_start = DUK_HSTRING_GET_DATA(h_this); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_this); + p = p_start + bpos; + + /* This loop is optimized for size. For speed, there should be + * two separate loops, and we should ensure that memcmp() can be + * used without an extra "will searchstring fit" check. Doing + * the preconditioning for 'p' and 'p_end' is easy but cpos + * must be updated if 'p' is wound back (backward scanning). + */ + + firstbyte = q_start[0]; /* leading byte of match string */ + while (p <= p_end && p >= p_start) { + t = *p; + + /* For ECMAScript strings, this check can only match for + * initial UTF-8 bytes (not continuation bytes). For other + * strings all bets are off. + */ + + if ((t == firstbyte) && ((duk_size_t) (p_end - p) >= (duk_size_t) q_blen)) { + DUK_ASSERT(q_blen > 0); + if (duk_memcmp((const void *) p, (const void *) q_start, (size_t) q_blen) == 0) { + return cpos; + } + } + + /* track cpos while scanning */ + if (backwards) { + /* when going backwards, we decrement cpos 'early'; + * 'p' may point to a continuation byte of the char + * at offset 'cpos', but that's OK because we'll + * backtrack all the way to the initial byte. + */ + if ((t & 0xc0) != 0x80) { + cpos--; + } + p--; + } else { + if ((t & 0xc0) != 0x80) { + cpos++; + } + p++; + } + } + + /* Not found. Empty string case is handled specially above. */ + return -1; +} + +/* + * Constructor + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_constructor(duk_hthread *thr) { + duk_hstring *h; + duk_uint_t flags; + + /* String constructor needs to distinguish between an argument not given at all + * vs. given as 'undefined'. We're a vararg function to handle this properly. + */ + + /* XXX: copy current activation flags to thr, including current magic, + * is_constructor_call etc. This takes a few bytes in duk_hthread but + * makes call sites smaller (there are >30 is_constructor_call and get + * current magic call sites. + */ + + if (duk_get_top(thr) == 0) { + duk_push_hstring_empty(thr); + } else { + h = duk_to_hstring_acceptsymbol(thr, 0); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h) && !duk_is_constructor_call(thr))) { + duk_push_symbol_descriptive_string(thr, h); + duk_replace(thr, 0); + } + } + duk_to_string(thr, 0); /* catches symbol argument for constructor call */ + DUK_ASSERT(duk_is_string(thr, 0)); + duk_set_top(thr, 1); /* Top may be 1 or larger. */ + + if (duk_is_constructor_call(thr)) { + /* String object internal value is immutable */ + flags = DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_STRING); + duk_push_object_helper(thr, flags, DUK_BIDX_STRING_PROTOTYPE); + duk_dup_0(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE); + } + /* Note: unbalanced stack on purpose */ + + return 1; +} + +DUK_LOCAL duk_ret_t duk__construct_from_codepoints(duk_hthread *thr, duk_bool_t nonbmp) { + duk_bufwriter_ctx bw_alloc; + duk_bufwriter_ctx *bw; + duk_idx_t i, n; + duk_ucodepoint_t cp; + + /* XXX: It would be nice to build the string directly but ToUint16() + * coercion is needed so a generic helper would not be very + * helpful (perhaps coerce the value stack first here and then + * build a string from a duk_tval number sequence in one go?). + */ + + n = duk_get_top(thr); + + bw = &bw_alloc; + DUK_BW_INIT_PUSHBUF(thr, bw, (duk_size_t) n); /* initial estimate for ASCII only codepoints */ + + for (i = 0; i < n; i++) { + /* XXX: could improve bufwriter handling to write multiple codepoints + * with one ensure call but the relative benefit would be quite small. + */ + + if (nonbmp) { + /* ES2015 requires that (1) SameValue(cp, ToInteger(cp)) and + * (2) cp >= 0 and cp <= 0x10ffff. This check does not + * implement the steps exactly but the outcome should be + * the same. + */ + duk_int32_t i32 = 0; + if (!duk_is_whole_get_int32(duk_to_number(thr, i), &i32) || + i32 < 0 || i32 > 0x10ffffL) { + DUK_DCERROR_RANGE_INVALID_ARGS(thr); + } + DUK_ASSERT(i32 >= 0 && i32 <= 0x10ffffL); + cp = (duk_ucodepoint_t) i32; + DUK_BW_WRITE_ENSURE_CESU8(thr, bw, cp); + } else { +#if defined(DUK_USE_NONSTD_STRING_FROMCHARCODE_32BIT) + /* ToUint16() coercion is mandatory in the E5.1 specification, but + * this non-compliant behavior makes more sense because we support + * non-BMP codepoints. Don't use CESU-8 because that'd create + * surrogate pairs. + */ + cp = (duk_ucodepoint_t) duk_to_uint32(thr, i); + DUK_BW_WRITE_ENSURE_XUTF8(thr, bw, cp); +#else + cp = (duk_ucodepoint_t) duk_to_uint16(thr, i); + DUK_ASSERT(cp >= 0 && cp <= 0x10ffffL); + DUK_BW_WRITE_ENSURE_CESU8(thr, bw, cp); +#endif + } + } + + DUK_BW_COMPACT(thr, bw); + (void) duk_buffer_to_string(thr, -1); /* Safe, extended UTF-8 or CESU-8 encoded. */ + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_string_constructor_from_char_code(duk_hthread *thr) { + return duk__construct_from_codepoints(thr, 0 /*nonbmp*/); +} + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_string_constructor_from_code_point(duk_hthread *thr) { + return duk__construct_from_codepoints(thr, 1 /*nonbmp*/); +} +#endif + +/* + * toString(), valueOf() + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_to_string(duk_hthread *thr) { + duk_tval *tv; + + duk_push_this(thr); + tv = duk_require_tval(thr, -1); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_IS_STRING(tv)) { + /* return as is */ + } else if (DUK_TVAL_IS_OBJECT(tv)) { + duk_hobject *h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + + /* Must be a "string object", i.e. class "String" */ + if (DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_STRING) { + goto type_error; + } + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE); + DUK_ASSERT(duk_is_string(thr, -1)); + } else { + goto type_error; + } + + (void) duk_require_hstring_notsymbol(thr, -1); /* Reject symbols (and wrapped symbols). */ + return 1; + + type_error: + DUK_DCERROR_TYPE_INVALID_ARGS(thr); +} + +/* + * Character and charcode access + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_char_at(duk_hthread *thr) { + duk_hstring *h; + duk_int_t pos; + + /* XXX: faster implementation */ + + h = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h != NULL); + + pos = duk_to_int(thr, 0); + + if (sizeof(duk_size_t) >= sizeof(duk_uint_t)) { + /* Cast to duk_size_t works in this case: + * - If pos < 0, (duk_size_t) pos will always be + * >= max_charlen, and result will be the empty string + * (see duk_substring()). + * - If pos >= 0, pos + 1 cannot wrap. + */ + DUK_ASSERT((duk_size_t) DUK_INT_MIN >= DUK_HSTRING_MAX_BYTELEN); + DUK_ASSERT((duk_size_t) DUK_INT_MAX + 1U > (duk_size_t) DUK_INT_MAX); + duk_substring(thr, -1, (duk_size_t) pos, (duk_size_t) pos + 1U); + } else { + /* If size_t is smaller than int, explicit bounds checks + * are needed because an int may wrap multiple times. + */ + if (DUK_UNLIKELY(pos < 0 || (duk_uint_t) pos >= (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h))) { + duk_push_hstring_empty(thr); + } else { + duk_substring(thr, -1, (duk_size_t) pos, (duk_size_t) pos + 1U); + } + } + + return 1; +} + +/* Magic: 0=charCodeAt, 1=codePointAt */ +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_char_code_at(duk_hthread *thr) { + duk_int_t pos; + duk_hstring *h; + duk_bool_t clamped; + duk_uint32_t cp; + duk_int_t magic; + + /* XXX: faster implementation */ + + DUK_DDD(DUK_DDDPRINT("arg=%!T", (duk_tval *) duk_get_tval(thr, 0))); + + h = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h != NULL); + + pos = duk_to_int_clamped_raw(thr, + 0 /*index*/, + 0 /*min(incl)*/, + (duk_int_t) DUK_HSTRING_GET_CHARLEN(h) - 1 /*max(incl)*/, + &clamped /*out_clamped*/); +#if defined(DUK_USE_ES6) + magic = duk_get_current_magic(thr); +#else + DUK_ASSERT(duk_get_current_magic(thr) == 0); + magic = 0; +#endif + if (clamped) { + /* For out-of-bounds indices .charCodeAt() returns NaN and + * .codePointAt() returns undefined. + */ + if (magic != 0) { + return 0; + } + duk_push_nan(thr); + } else { + DUK_ASSERT(pos >= 0); + cp = (duk_uint32_t) duk_hstring_char_code_at_raw(thr, h, (duk_uint_t) pos, (duk_bool_t) magic /*surrogate_aware*/); + duk_push_u32(thr, cp); + } + return 1; +} + +/* + * substring(), substr(), slice() + */ + +/* XXX: any chance of merging these three similar but still slightly + * different algorithms so that footprint would be reduced? + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_substring(duk_hthread *thr) { + duk_hstring *h; + duk_int_t start_pos, end_pos; + duk_int_t len; + + h = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h != NULL); + len = (duk_int_t) DUK_HSTRING_GET_CHARLEN(h); + + /* [ start end str ] */ + + start_pos = duk_to_int_clamped(thr, 0, 0, len); + if (duk_is_undefined(thr, 1)) { + end_pos = len; + } else { + end_pos = duk_to_int_clamped(thr, 1, 0, len); + } + DUK_ASSERT(start_pos >= 0 && start_pos <= len); + DUK_ASSERT(end_pos >= 0 && end_pos <= len); + + if (start_pos > end_pos) { + duk_int_t tmp = start_pos; + start_pos = end_pos; + end_pos = tmp; + } + + DUK_ASSERT(end_pos >= start_pos); + + duk_substring(thr, -1, (duk_size_t) start_pos, (duk_size_t) end_pos); + return 1; +} + +#if defined(DUK_USE_SECTION_B) +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_substr(duk_hthread *thr) { + duk_hstring *h; + duk_int_t start_pos, end_pos; + duk_int_t len; + + /* Unlike non-obsolete String calls, substr() algorithm in E5.1 + * specification will happily coerce undefined and null to strings + * ("undefined" and "null"). + */ + duk_push_this(thr); + h = duk_to_hstring_m1(thr); /* Reject Symbols. */ + DUK_ASSERT(h != NULL); + len = (duk_int_t) DUK_HSTRING_GET_CHARLEN(h); + + /* [ start length str ] */ + + /* The implementation for computing of start_pos and end_pos differs + * from the standard algorithm, but is intended to result in the exactly + * same behavior. This is not always obvious. + */ + + /* combines steps 2 and 5; -len ensures max() not needed for step 5 */ + start_pos = duk_to_int_clamped(thr, 0, -len, len); + if (start_pos < 0) { + start_pos = len + start_pos; + } + DUK_ASSERT(start_pos >= 0 && start_pos <= len); + + /* combines steps 3, 6; step 7 is not needed */ + if (duk_is_undefined(thr, 1)) { + end_pos = len; + } else { + DUK_ASSERT(start_pos <= len); + end_pos = start_pos + duk_to_int_clamped(thr, 1, 0, len - start_pos); + } + DUK_ASSERT(start_pos >= 0 && start_pos <= len); + DUK_ASSERT(end_pos >= 0 && end_pos <= len); + DUK_ASSERT(end_pos >= start_pos); + + duk_substring(thr, -1, (duk_size_t) start_pos, (duk_size_t) end_pos); + return 1; +} +#endif /* DUK_USE_SECTION_B */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_slice(duk_hthread *thr) { + duk_hstring *h; + duk_int_t start_pos, end_pos; + duk_int_t len; + + h = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h != NULL); + len = (duk_int_t) DUK_HSTRING_GET_CHARLEN(h); + + /* [ start end str ] */ + + start_pos = duk_to_int_clamped(thr, 0, -len, len); + if (start_pos < 0) { + start_pos = len + start_pos; + } + if (duk_is_undefined(thr, 1)) { + end_pos = len; + } else { + end_pos = duk_to_int_clamped(thr, 1, -len, len); + if (end_pos < 0) { + end_pos = len + end_pos; + } + } + DUK_ASSERT(start_pos >= 0 && start_pos <= len); + DUK_ASSERT(end_pos >= 0 && end_pos <= len); + + if (end_pos < start_pos) { + end_pos = start_pos; + } + + DUK_ASSERT(end_pos >= start_pos); + + duk_substring(thr, -1, (duk_size_t) start_pos, (duk_size_t) end_pos); + return 1; +} + +/* + * Case conversion + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_caseconv_shared(duk_hthread *thr) { + duk_small_int_t uppercase = duk_get_current_magic(thr); + + (void) duk_push_this_coercible_to_string(thr); + duk_unicode_case_convert_string(thr, (duk_bool_t) uppercase); + return 1; +} + +/* + * indexOf() and lastIndexOf() + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_indexof_shared(duk_hthread *thr) { + duk_hstring *h_this; + duk_hstring *h_search; + duk_int_t clen_this; + duk_int_t cpos; + duk_small_uint_t is_lastindexof = (duk_small_uint_t) duk_get_current_magic(thr); /* 0=indexOf, 1=lastIndexOf */ + + h_this = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h_this != NULL); + clen_this = (duk_int_t) DUK_HSTRING_GET_CHARLEN(h_this); + + h_search = duk_to_hstring(thr, 0); + DUK_ASSERT(h_search != NULL); + + duk_to_number(thr, 1); + if (duk_is_nan(thr, 1) && is_lastindexof) { + /* indexOf: NaN should cause pos to be zero. + * lastIndexOf: NaN should cause pos to be +Infinity + * (and later be clamped to len). + */ + cpos = clen_this; + } else { + cpos = duk_to_int_clamped(thr, 1, 0, clen_this); + } + + cpos = duk__str_search_shared(thr, h_this, h_search, cpos, is_lastindexof /*backwards*/); + duk_push_int(thr, cpos); + return 1; +} + +/* + * replace() + */ + +/* XXX: the current implementation works but is quite clunky; it compiles + * to almost 1,4kB of x86 code so it needs to be simplified (better approach, + * shared helpers, etc). Some ideas for refactoring: + * + * - a primitive to convert a string into a regexp matcher (reduces matching + * code at the cost of making matching much slower) + * - use replace() as a basic helper for match() and split(), which are both + * much simpler + * - API call to get_prop and to_boolean + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_replace(duk_hthread *thr) { + duk_hstring *h_input; + duk_hstring *h_match; + duk_hstring *h_search; + duk_hobject *h_re; + duk_bufwriter_ctx bw_alloc; + duk_bufwriter_ctx *bw; +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_bool_t is_regexp; + duk_bool_t is_global; +#endif + duk_bool_t is_repl_func; + duk_uint32_t match_start_coff, match_start_boff; +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_int_t match_caps; +#endif + duk_uint32_t prev_match_end_boff; + const duk_uint8_t *r_start, *r_end, *r; /* repl string scan */ + duk_size_t tmp_sz; + + DUK_ASSERT_TOP(thr, 2); + h_input = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h_input != NULL); + + bw = &bw_alloc; + DUK_BW_INIT_PUSHBUF(thr, bw, DUK_HSTRING_GET_BYTELEN(h_input)); /* input size is good output starting point */ + + DUK_ASSERT_TOP(thr, 4); + + /* stack[0] = search value + * stack[1] = replace value + * stack[2] = input string + * stack[3] = result buffer + */ + + h_re = duk_get_hobject_with_class(thr, 0, DUK_HOBJECT_CLASS_REGEXP); + if (h_re) { +#if defined(DUK_USE_REGEXP_SUPPORT) + is_regexp = 1; + is_global = duk_get_prop_stridx_boolean(thr, 0, DUK_STRIDX_GLOBAL, NULL); + + if (is_global) { + /* start match from beginning */ + duk_push_int(thr, 0); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + } +#else /* DUK_USE_REGEXP_SUPPORT */ + DUK_DCERROR_UNSUPPORTED(thr); +#endif /* DUK_USE_REGEXP_SUPPORT */ + } else { + duk_to_string(thr, 0); /* rejects symbols */ +#if defined(DUK_USE_REGEXP_SUPPORT) + is_regexp = 0; + is_global = 0; +#endif + } + + if (duk_is_function(thr, 1)) { + is_repl_func = 1; + r_start = NULL; + r_end = NULL; + } else { + duk_hstring *h_repl; + + is_repl_func = 0; + h_repl = duk_to_hstring(thr, 1); /* reject symbols */ + DUK_ASSERT(h_repl != NULL); + r_start = DUK_HSTRING_GET_DATA(h_repl); + r_end = r_start + DUK_HSTRING_GET_BYTELEN(h_repl); + } + + prev_match_end_boff = 0; + + for (;;) { + /* + * If matching with a regexp: + * - non-global RegExp: lastIndex not touched on a match, zeroed + * on a non-match + * - global RegExp: on match, lastIndex will be updated by regexp + * executor to point to next char after the matching part (so that + * characters in the matching part are not matched again) + * + * If matching with a string: + * - always non-global match, find first occurrence + * + * We need: + * - The character offset of start-of-match for the replacer function + * - The byte offsets for start-of-match and end-of-match to implement + * the replacement values $&, $`, and $', and to copy non-matching + * input string portions (including header and trailer) verbatim. + * + * NOTE: the E5.1 specification is a bit vague how the RegExp should + * behave in the replacement process; e.g. is matching done first for + * all matches (in the global RegExp case) before any replacer calls + * are made? See: test-bi-string-proto-replace.js for discussion. + */ + + DUK_ASSERT_TOP(thr, 4); + +#if defined(DUK_USE_REGEXP_SUPPORT) + if (is_regexp) { + duk_dup_0(thr); + duk_dup_2(thr); + duk_regexp_match(thr); /* [ ... regexp input ] -> [ res_obj ] */ + if (!duk_is_object(thr, -1)) { + duk_pop(thr); + break; + } + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INDEX); + DUK_ASSERT(duk_is_number(thr, -1)); + match_start_coff = duk_get_uint(thr, -1); + duk_pop(thr); + + duk_get_prop_index(thr, -1, 0); + DUK_ASSERT(duk_is_string(thr, -1)); + h_match = duk_known_hstring(thr, -1); + duk_pop(thr); /* h_match is borrowed, remains reachable through match_obj */ + + if (DUK_HSTRING_GET_BYTELEN(h_match) == 0) { + /* This should be equivalent to match() algorithm step 8.f.iii.2: + * detect an empty match and allow it, but don't allow it twice. + */ + duk_uint32_t last_index; + + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + last_index = (duk_uint32_t) duk_get_uint(thr, -1); + DUK_DDD(DUK_DDDPRINT("empty match, bump lastIndex: %ld -> %ld", + (long) last_index, (long) (last_index + 1))); + duk_pop(thr); + duk_push_uint(thr, (duk_uint_t) (last_index + 1)); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + } + + DUK_ASSERT(duk_get_length(thr, -1) <= DUK_INT_MAX); /* string limits */ + match_caps = (duk_int_t) duk_get_length(thr, -1); + } else { +#else /* DUK_USE_REGEXP_SUPPORT */ + { /* unconditionally */ +#endif /* DUK_USE_REGEXP_SUPPORT */ + const duk_uint8_t *p_start, *p_end, *p; /* input string scan */ + const duk_uint8_t *q_start; /* match string */ + duk_size_t q_blen; + +#if defined(DUK_USE_REGEXP_SUPPORT) + DUK_ASSERT(!is_global); /* single match always */ +#endif + + p_start = DUK_HSTRING_GET_DATA(h_input); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input); + p = p_start; + + h_search = duk_known_hstring(thr, 0); + q_start = DUK_HSTRING_GET_DATA(h_search); + q_blen = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h_search); + + p_end -= q_blen; /* ensure full memcmp() fits in while */ + + match_start_coff = 0; + + while (p <= p_end) { + DUK_ASSERT(p + q_blen <= DUK_HSTRING_GET_DATA(h_input) + DUK_HSTRING_GET_BYTELEN(h_input)); + if (duk_memcmp((const void *) p, (const void *) q_start, (size_t) q_blen) == 0) { + duk_dup_0(thr); + h_match = duk_known_hstring(thr, -1); +#if defined(DUK_USE_REGEXP_SUPPORT) + match_caps = 0; +#endif + goto found; + } + + /* track utf-8 non-continuation bytes */ + if ((p[0] & 0xc0) != 0x80) { + match_start_coff++; + } + p++; + } + + /* not found */ + break; + } + found: + + /* stack[0] = search value + * stack[1] = replace value + * stack[2] = input string + * stack[3] = result buffer + * stack[4] = regexp match OR match string + */ + + match_start_boff = (duk_uint32_t) duk_heap_strcache_offset_char2byte(thr, h_input, match_start_coff); + + tmp_sz = (duk_size_t) (match_start_boff - prev_match_end_boff); + DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff, tmp_sz); + + prev_match_end_boff = match_start_boff + DUK_HSTRING_GET_BYTELEN(h_match); + + if (is_repl_func) { + duk_idx_t idx_args; + duk_hstring *h_repl; + + /* regexp res_obj is at index 4 */ + + duk_dup_1(thr); + idx_args = duk_get_top(thr); + +#if defined(DUK_USE_REGEXP_SUPPORT) + if (is_regexp) { + duk_int_t idx; + duk_require_stack(thr, match_caps + 2); + for (idx = 0; idx < match_caps; idx++) { + /* match followed by capture(s) */ + duk_get_prop_index(thr, 4, (duk_uarridx_t) idx); + } + } else { +#else /* DUK_USE_REGEXP_SUPPORT */ + { /* unconditionally */ +#endif /* DUK_USE_REGEXP_SUPPORT */ + /* match == search string, by definition */ + duk_dup_0(thr); + } + duk_push_uint(thr, (duk_uint_t) match_start_coff); + duk_dup_2(thr); + + /* [ ... replacer match [captures] match_char_offset input ] */ + + duk_call(thr, duk_get_top(thr) - idx_args); + h_repl = duk_to_hstring_m1(thr); /* -> [ ... repl_value ] */ + DUK_ASSERT(h_repl != NULL); + + DUK_BW_WRITE_ENSURE_HSTRING(thr, bw, h_repl); + + duk_pop(thr); /* repl_value */ + } else { + r = r_start; + + while (r < r_end) { + duk_int_t ch1; + duk_int_t ch2; +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_int_t ch3; +#endif + duk_size_t left; + + ch1 = *r++; + if (ch1 != DUK_ASC_DOLLAR) { + goto repl_write; + } + DUK_ASSERT(r <= r_end); + left = (duk_size_t) (r_end - r); + + if (left <= 0) { + goto repl_write; + } + + ch2 = r[0]; + switch (ch2) { + case DUK_ASC_DOLLAR: { + ch1 = (1 << 8) + DUK_ASC_DOLLAR; + goto repl_write; + } + case DUK_ASC_AMP: { + DUK_BW_WRITE_ENSURE_HSTRING(thr, bw, h_match); + r++; + continue; + } + case DUK_ASC_GRAVE: { + tmp_sz = (duk_size_t) match_start_boff; + DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input), tmp_sz); + r++; + continue; + } + case DUK_ASC_SINGLEQUOTE: { + duk_uint32_t match_end_boff; + + /* Use match charlen instead of bytelen, just in case the input and + * match codepoint encodings would have different lengths. + */ + /* XXX: charlen computed here, and also in char2byte helper. */ + match_end_boff = (duk_uint32_t) duk_heap_strcache_offset_char2byte(thr, + h_input, + match_start_coff + (duk_uint_fast32_t) DUK_HSTRING_GET_CHARLEN(h_match)); + + tmp_sz = (duk_size_t) (DUK_HSTRING_GET_BYTELEN(h_input) - match_end_boff); + DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input) + match_end_boff, tmp_sz); + r++; + continue; + } + default: { +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_int_t capnum, captmp, capadv; + /* XXX: optional check, match_caps is zero if no regexp, + * so dollar will be interpreted literally anyway. + */ + + if (!is_regexp) { + goto repl_write; + } + + if (!(ch2 >= DUK_ASC_0 && ch2 <= DUK_ASC_9)) { + goto repl_write; + } + capnum = ch2 - DUK_ASC_0; + capadv = 1; + + if (left >= 2) { + ch3 = r[1]; + if (ch3 >= DUK_ASC_0 && ch3 <= DUK_ASC_9) { + captmp = capnum * 10 + (ch3 - DUK_ASC_0); + if (captmp < match_caps) { + capnum = captmp; + capadv = 2; + } + } + } + + if (capnum > 0 && capnum < match_caps) { + DUK_ASSERT(is_regexp != 0); /* match_caps == 0 without regexps */ + + /* regexp res_obj is at offset 4 */ + duk_get_prop_index(thr, 4, (duk_uarridx_t) capnum); + if (duk_is_string(thr, -1)) { + duk_hstring *h_tmp_str; + + h_tmp_str = duk_known_hstring(thr, -1); + + DUK_BW_WRITE_ENSURE_HSTRING(thr, bw, h_tmp_str); + } else { + /* undefined -> skip (replaced with empty) */ + } + duk_pop(thr); + r += capadv; + continue; + } else { + goto repl_write; + } +#else /* DUK_USE_REGEXP_SUPPORT */ + goto repl_write; /* unconditionally */ +#endif /* DUK_USE_REGEXP_SUPPORT */ + } /* default case */ + } /* switch (ch2) */ + + repl_write: + /* ch1 = (r_increment << 8) + byte */ + + DUK_BW_WRITE_ENSURE_U8(thr, bw, (duk_uint8_t) (ch1 & 0xff)); + r += ch1 >> 8; + } /* while repl */ + } /* if (is_repl_func) */ + + duk_pop(thr); /* pop regexp res_obj or match string */ + +#if defined(DUK_USE_REGEXP_SUPPORT) + if (!is_global) { +#else + { /* unconditionally; is_global==0 */ +#endif + break; + } + } + + /* trailer */ + tmp_sz = (duk_size_t) (DUK_HSTRING_GET_BYTELEN(h_input) - prev_match_end_boff); + DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff, tmp_sz); + + DUK_ASSERT_TOP(thr, 4); + DUK_BW_COMPACT(thr, bw); + (void) duk_buffer_to_string(thr, -1); /* Safe if inputs are safe. */ + return 1; +} + +/* + * split() + */ + +/* XXX: very messy now, but works; clean up, remove unused variables (nomimally + * used so compiler doesn't complain). + */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_split(duk_hthread *thr) { + duk_hstring *h_input; + duk_hstring *h_sep; + duk_uint32_t limit; + duk_uint32_t arr_idx; +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_bool_t is_regexp; +#endif + duk_bool_t matched; /* set to 1 if any match exists (needed for empty input special case) */ + duk_uint32_t prev_match_end_coff, prev_match_end_boff; + duk_uint32_t match_start_boff, match_start_coff; + duk_uint32_t match_end_boff, match_end_coff; + + h_input = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h_input != NULL); + + duk_push_array(thr); + + if (duk_is_undefined(thr, 1)) { + limit = 0xffffffffUL; + } else { + limit = duk_to_uint32(thr, 1); + } + + if (limit == 0) { + return 1; + } + + /* If the separator is a RegExp, make a "clone" of it. The specification + * algorithm calls [[Match]] directly for specific indices; we emulate this + * by tweaking lastIndex and using a "force global" variant of duk_regexp_match() + * which will use global-style matching even when the RegExp itself is non-global. + */ + + if (duk_is_undefined(thr, 0)) { + /* The spec algorithm first does "R = ToString(separator)" before checking + * whether separator is undefined. Since this is side effect free, we can + * skip the ToString() here. + */ + duk_dup_2(thr); + duk_put_prop_index(thr, 3, 0); + return 1; + } else if (duk_get_hobject_with_class(thr, 0, DUK_HOBJECT_CLASS_REGEXP) != NULL) { +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_push_hobject_bidx(thr, DUK_BIDX_REGEXP_CONSTRUCTOR); + duk_dup_0(thr); + duk_new(thr, 1); /* [ ... RegExp val ] -> [ ... res ] */ + duk_replace(thr, 0); + /* lastIndex is initialized to zero by new RegExp() */ + is_regexp = 1; +#else + DUK_DCERROR_UNSUPPORTED(thr); +#endif + } else { + duk_to_string(thr, 0); +#if defined(DUK_USE_REGEXP_SUPPORT) + is_regexp = 0; +#endif + } + + /* stack[0] = separator (string or regexp) + * stack[1] = limit + * stack[2] = input string + * stack[3] = result array + */ + + prev_match_end_boff = 0; + prev_match_end_coff = 0; + arr_idx = 0; + matched = 0; + + for (;;) { + /* + * The specification uses RegExp [[Match]] to attempt match at specific + * offsets. We don't have such a primitive, so we use an actual RegExp + * and tweak lastIndex. Since the RegExp may be non-global, we use a + * special variant which forces global-like behavior for matching. + */ + + DUK_ASSERT_TOP(thr, 4); + +#if defined(DUK_USE_REGEXP_SUPPORT) + if (is_regexp) { + duk_dup_0(thr); + duk_dup_2(thr); + duk_regexp_match_force_global(thr); /* [ ... regexp input ] -> [ res_obj ] */ + if (!duk_is_object(thr, -1)) { + duk_pop(thr); + break; + } + matched = 1; + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INDEX); + DUK_ASSERT(duk_is_number(thr, -1)); + match_start_coff = duk_get_uint(thr, -1); + match_start_boff = (duk_uint32_t) duk_heap_strcache_offset_char2byte(thr, h_input, match_start_coff); + duk_pop(thr); + + if (match_start_coff == DUK_HSTRING_GET_CHARLEN(h_input)) { + /* don't allow an empty match at the end of the string */ + duk_pop(thr); + break; + } + + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + DUK_ASSERT(duk_is_number(thr, -1)); + match_end_coff = duk_get_uint(thr, -1); + match_end_boff = (duk_uint32_t) duk_heap_strcache_offset_char2byte(thr, h_input, match_end_coff); + duk_pop(thr); + + /* empty match -> bump and continue */ + if (prev_match_end_boff == match_end_boff) { + duk_push_uint(thr, (duk_uint_t) (match_end_coff + 1)); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + duk_pop(thr); + continue; + } + } else { +#else /* DUK_USE_REGEXP_SUPPORT */ + { /* unconditionally */ +#endif /* DUK_USE_REGEXP_SUPPORT */ + const duk_uint8_t *p_start, *p_end, *p; /* input string scan */ + const duk_uint8_t *q_start; /* match string */ + duk_size_t q_blen, q_clen; + + p_start = DUK_HSTRING_GET_DATA(h_input); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input); + p = p_start + prev_match_end_boff; + + h_sep = duk_known_hstring(thr, 0); /* symbol already rejected above */ + q_start = DUK_HSTRING_GET_DATA(h_sep); + q_blen = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h_sep); + q_clen = (duk_size_t) DUK_HSTRING_GET_CHARLEN(h_sep); + + p_end -= q_blen; /* ensure full memcmp() fits in while */ + + match_start_coff = prev_match_end_coff; + + if (q_blen == 0) { + /* Handle empty separator case: it will always match, and always + * triggers the check in step 13.c.iii initially. Note that we + * must skip to either end of string or start of first codepoint, + * skipping over any continuation bytes! + * + * Don't allow an empty string to match at the end of the input. + */ + + matched = 1; /* empty separator can always match */ + + match_start_coff++; + p++; + while (p < p_end) { + if ((p[0] & 0xc0) != 0x80) { + goto found; + } + p++; + } + goto not_found; + } + + DUK_ASSERT(q_blen > 0 && q_clen > 0); + while (p <= p_end) { + DUK_ASSERT(p + q_blen <= DUK_HSTRING_GET_DATA(h_input) + DUK_HSTRING_GET_BYTELEN(h_input)); + DUK_ASSERT(q_blen > 0); /* no issues with empty memcmp() */ + if (duk_memcmp((const void *) p, (const void *) q_start, (size_t) q_blen) == 0) { + /* never an empty match, so step 13.c.iii can't be triggered */ + goto found; + } + + /* track utf-8 non-continuation bytes */ + if ((p[0] & 0xc0) != 0x80) { + match_start_coff++; + } + p++; + } + + not_found: + /* not found */ + break; + + found: + matched = 1; + match_start_boff = (duk_uint32_t) (p - p_start); + match_end_coff = (duk_uint32_t) (match_start_coff + q_clen); /* constrained by string length */ + match_end_boff = (duk_uint32_t) (match_start_boff + q_blen); /* ditto */ + + /* empty match (may happen with empty separator) -> bump and continue */ + if (prev_match_end_boff == match_end_boff) { + prev_match_end_boff++; + prev_match_end_coff++; + continue; + } + } /* if (is_regexp) */ + + /* stack[0] = separator (string or regexp) + * stack[1] = limit + * stack[2] = input string + * stack[3] = result array + * stack[4] = regexp res_obj (if is_regexp) + */ + + DUK_DDD(DUK_DDDPRINT("split; match_start b=%ld,c=%ld, match_end b=%ld,c=%ld, prev_end b=%ld,c=%ld", + (long) match_start_boff, (long) match_start_coff, + (long) match_end_boff, (long) match_end_coff, + (long) prev_match_end_boff, (long) prev_match_end_coff)); + + duk_push_lstring(thr, + (const char *) (DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff), + (duk_size_t) (match_start_boff - prev_match_end_boff)); + duk_put_prop_index(thr, 3, arr_idx); + arr_idx++; + if (arr_idx >= limit) { + goto hit_limit; + } + +#if defined(DUK_USE_REGEXP_SUPPORT) + if (is_regexp) { + duk_size_t i, len; + + len = duk_get_length(thr, 4); + for (i = 1; i < len; i++) { + DUK_ASSERT(i <= DUK_UARRIDX_MAX); /* cannot have >4G captures */ + duk_get_prop_index(thr, 4, (duk_uarridx_t) i); + duk_put_prop_index(thr, 3, arr_idx); + arr_idx++; + if (arr_idx >= limit) { + goto hit_limit; + } + } + + duk_pop(thr); + /* lastIndex already set up for next match */ + } else { +#else /* DUK_USE_REGEXP_SUPPORT */ + { /* unconditionally */ +#endif /* DUK_USE_REGEXP_SUPPORT */ + /* no action */ + } + + prev_match_end_boff = match_end_boff; + prev_match_end_coff = match_end_coff; + continue; + } /* for */ + + /* Combined step 11 (empty string special case) and 14-15. */ + + DUK_DDD(DUK_DDDPRINT("split trailer; prev_end b=%ld,c=%ld", + (long) prev_match_end_boff, (long) prev_match_end_coff)); + + if (DUK_HSTRING_GET_BYTELEN(h_input) > 0 || !matched) { + /* Add trailer if: + * a) non-empty input + * b) empty input and no (zero size) match found (step 11) + */ + + duk_push_lstring(thr, + (const char *) DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff, + (duk_size_t) (DUK_HSTRING_GET_BYTELEN(h_input) - prev_match_end_boff)); + duk_put_prop_index(thr, 3, arr_idx); + /* No arr_idx update or limit check */ + } + + return 1; + + hit_limit: +#if defined(DUK_USE_REGEXP_SUPPORT) + if (is_regexp) { + duk_pop(thr); + } +#endif + + return 1; +} + +/* + * Various + */ + +#if defined(DUK_USE_REGEXP_SUPPORT) +DUK_LOCAL void duk__to_regexp_helper(duk_hthread *thr, duk_idx_t idx, duk_bool_t force_new) { + duk_hobject *h; + + /* Shared helper for match() steps 3-4, search() steps 3-4. */ + + DUK_ASSERT(idx >= 0); + + if (force_new) { + goto do_new; + } + + h = duk_get_hobject_with_class(thr, idx, DUK_HOBJECT_CLASS_REGEXP); + if (!h) { + goto do_new; + } + return; + + do_new: + duk_push_hobject_bidx(thr, DUK_BIDX_REGEXP_CONSTRUCTOR); + duk_dup(thr, idx); + duk_new(thr, 1); /* [ ... RegExp val ] -> [ ... res ] */ + duk_replace(thr, idx); +} +#endif /* DUK_USE_REGEXP_SUPPORT */ + +#if defined(DUK_USE_REGEXP_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_search(duk_hthread *thr) { + /* Easiest way to implement the search required by the specification + * is to do a RegExp test() with lastIndex forced to zero. To avoid + * side effects on the argument, "clone" the RegExp if a RegExp was + * given as input. + * + * The global flag of the RegExp should be ignored; setting lastIndex + * to zero (which happens when "cloning" the RegExp) should have an + * equivalent effect. + */ + + DUK_ASSERT_TOP(thr, 1); + (void) duk_push_this_coercible_to_string(thr); /* at index 1 */ + duk__to_regexp_helper(thr, 0 /*index*/, 1 /*force_new*/); + + /* stack[0] = regexp + * stack[1] = string + */ + + /* Avoid using RegExp.prototype methods, as they're writable and + * configurable and may have been changed. + */ + + duk_dup_0(thr); + duk_dup_1(thr); /* [ ... re_obj input ] */ + duk_regexp_match(thr); /* -> [ ... res_obj ] */ + + if (!duk_is_object(thr, -1)) { + duk_push_int(thr, -1); + return 1; + } + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INDEX); + DUK_ASSERT(duk_is_number(thr, -1)); + return 1; +} +#endif /* DUK_USE_REGEXP_SUPPORT */ + +#if defined(DUK_USE_REGEXP_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_match(duk_hthread *thr) { + duk_bool_t global; + duk_int_t prev_last_index; + duk_int_t this_index; + duk_int_t arr_idx; + + DUK_ASSERT_TOP(thr, 1); + (void) duk_push_this_coercible_to_string(thr); + duk__to_regexp_helper(thr, 0 /*index*/, 0 /*force_new*/); + global = duk_get_prop_stridx_boolean(thr, 0, DUK_STRIDX_GLOBAL, NULL); + DUK_ASSERT_TOP(thr, 2); + + /* stack[0] = regexp + * stack[1] = string + */ + + if (!global) { + duk_regexp_match(thr); /* -> [ res_obj ] */ + return 1; /* return 'res_obj' */ + } + + /* Global case is more complex. */ + + /* [ regexp string ] */ + + duk_push_int(thr, 0); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + duk_push_array(thr); + + /* [ regexp string res_arr ] */ + + prev_last_index = 0; + arr_idx = 0; + + for (;;) { + DUK_ASSERT_TOP(thr, 3); + + duk_dup_0(thr); + duk_dup_1(thr); + duk_regexp_match(thr); /* -> [ ... regexp string ] -> [ ... res_obj ] */ + + if (!duk_is_object(thr, -1)) { + duk_pop(thr); + break; + } + + duk_get_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + DUK_ASSERT(duk_is_number(thr, -1)); + this_index = duk_get_int(thr, -1); + duk_pop(thr); + + if (this_index == prev_last_index) { + this_index++; + duk_push_int(thr, this_index); + duk_put_prop_stridx_short(thr, 0, DUK_STRIDX_LAST_INDEX); + } + prev_last_index = this_index; + + duk_get_prop_index(thr, -1, 0); /* match string */ + duk_put_prop_index(thr, 2, (duk_uarridx_t) arr_idx); + arr_idx++; + duk_pop(thr); /* res_obj */ + } + + if (arr_idx == 0) { + duk_push_null(thr); + } + + return 1; /* return 'res_arr' or 'null' */ +} +#endif /* DUK_USE_REGEXP_SUPPORT */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_concat(duk_hthread *thr) { + /* duk_concat() coerces arguments with ToString() in correct order */ + (void) duk_push_this_coercible_to_string(thr); + duk_insert(thr, 0); /* this is relatively expensive */ + duk_concat(thr, duk_get_top(thr)); + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_trim(duk_hthread *thr) { + DUK_ASSERT_TOP(thr, 0); + (void) duk_push_this_coercible_to_string(thr); + duk_trim(thr, 0); + DUK_ASSERT_TOP(thr, 1); + return 1; +} + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_repeat(duk_hthread *thr) { + duk_hstring *h_input; + duk_size_t input_blen; + duk_size_t result_len; + duk_int_t count_signed; + duk_uint_t count; + const duk_uint8_t *src; + duk_uint8_t *buf; + duk_uint8_t *p; + duk_double_t d; +#if !defined(DUK_USE_PREFER_SIZE) + duk_size_t copy_size; + duk_uint8_t *p_end; +#endif + + DUK_ASSERT_TOP(thr, 1); + h_input = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h_input != NULL); + input_blen = DUK_HSTRING_GET_BYTELEN(h_input); + + /* Count is ToNumber() coerced; +Infinity must be always rejected + * (even if input string is zero length), as well as negative values + * and -Infinity. -Infinity doesn't require an explicit check + * because duk_get_int() clamps it to DUK_INT_MIN which gets rejected + * as a negative value (regardless of input string length). + */ + d = duk_to_number(thr, 0); + if (duk_double_is_posinf(d)) { + goto fail_range; + } + count_signed = duk_get_int(thr, 0); + if (count_signed < 0) { + goto fail_range; + } + count = (duk_uint_t) count_signed; + + /* Overflow check for result length. */ + result_len = count * input_blen; + if (count != 0 && result_len / count != input_blen) { + goto fail_range; + } + + /* Temporary fixed buffer, later converted to string. */ + buf = (duk_uint8_t *) duk_push_fixed_buffer_nozero(thr, result_len); + DUK_ASSERT(buf != NULL); + src = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_input); + DUK_ASSERT(src != NULL); + +#if defined(DUK_USE_PREFER_SIZE) + p = buf; + while (count-- > 0) { + duk_memcpy((void *) p, (const void *) src, input_blen); /* copy size may be zero, but pointers are valid */ + p += input_blen; + } +#else /* DUK_USE_PREFER_SIZE */ + /* Take advantage of already copied pieces to speed up the process + * especially for small repeated strings. + */ + p = buf; + p_end = p + result_len; + copy_size = input_blen; + for (;;) { + duk_size_t remain = (duk_size_t) (p_end - p); + DUK_DDD(DUK_DDDPRINT("remain=%ld, copy_size=%ld, input_blen=%ld, result_len=%ld", + (long) remain, (long) copy_size, (long) input_blen, + (long) result_len)); + if (remain <= copy_size) { + /* If result_len is zero, this case is taken and does + * a zero size copy (with valid pointers). + */ + duk_memcpy((void *) p, (const void *) src, remain); + break; + } else { + duk_memcpy((void *) p, (const void *) src, copy_size); + p += copy_size; + } + + src = (const duk_uint8_t *) buf; /* Use buf as source for larger copies. */ + copy_size = (duk_size_t) (p - buf); + } +#endif /* DUK_USE_PREFER_SIZE */ + + /* XXX: It would be useful to be able to create a duk_hstring with + * a certain byte size whose data area wasn't initialized and which + * wasn't in the string table yet. This would allow a string to be + * constructed directly without a buffer temporary and when it was + * finished, it could be injected into the string table. Currently + * this isn't possible because duk_hstrings are only tracked by the + * intern table (they are not in heap_allocated). + */ + + duk_buffer_to_string(thr, -1); /* Safe if input is safe. */ + return 1; + + fail_range: + DUK_DCERROR_RANGE_INVALID_ARGS(thr); +} +#endif /* DUK_USE_ES6 */ + +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_locale_compare(duk_hthread *thr) { + duk_hstring *h1; + duk_hstring *h2; + duk_size_t h1_len, h2_len, prefix_len; + duk_small_int_t ret = 0; + duk_small_int_t rc; + + /* The current implementation of localeCompare() is simply a codepoint + * by codepoint comparison, implemented with a simple string compare + * because UTF-8 should preserve codepoint ordering (assuming valid + * shortest UTF-8 encoding). + * + * The specification requires that the return value must be related + * to the sort order: e.g. negative means that 'this' comes before + * 'that' in sort order. We assume an ascending sort order. + */ + + /* XXX: could share code with duk_js_ops.c, duk_js_compare_helper */ + + h1 = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h1 != NULL); + + h2 = duk_to_hstring(thr, 0); + DUK_ASSERT(h2 != NULL); + + h1_len = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h1); + h2_len = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h2); + prefix_len = (h1_len <= h2_len ? h1_len : h2_len); + + rc = (duk_small_int_t) duk_memcmp((const void *) DUK_HSTRING_GET_DATA(h1), + (const void *) DUK_HSTRING_GET_DATA(h2), + (size_t) prefix_len); + + if (rc < 0) { + ret = -1; + goto done; + } else if (rc > 0) { + ret = 1; + goto done; + } + + /* prefix matches, lengths matter now */ + if (h1_len > h2_len) { + ret = 1; + goto done; + } else if (h1_len == h2_len) { + DUK_ASSERT(ret == 0); + goto done; + } + ret = -1; + goto done; + + done: + duk_push_int(thr, (duk_int_t) ret); + return 1; +} + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_startswith_endswith(duk_hthread *thr) { + duk_int_t magic; + duk_hstring *h; + duk_hstring *h_search; + duk_size_t blen_search; + const duk_uint8_t *p_cmp_start; + duk_bool_t result; + + h = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h != NULL); + + h_search = duk__str_tostring_notregexp(thr, 0); + DUK_ASSERT(h_search != NULL); + + magic = duk_get_current_magic(thr); + + p_cmp_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h); + blen_search = DUK_HSTRING_GET_BYTELEN(h_search); + + if (duk_is_undefined(thr, 1)) { + if (magic) { + p_cmp_start = p_cmp_start + DUK_HSTRING_GET_BYTELEN(h) - blen_search; + } else { + /* p_cmp_start already OK */ + } + } else { + duk_int_t len; + duk_int_t pos; + + DUK_ASSERT(DUK_HSTRING_MAX_BYTELEN <= DUK_INT_MAX); + len = (duk_int_t) DUK_HSTRING_GET_CHARLEN(h); + pos = duk_to_int_clamped(thr, 1, 0, len); + DUK_ASSERT(pos >= 0 && pos <= len); + + if (magic) { + p_cmp_start -= blen_search; /* Conceptually subtracted last, but do already here. */ + } + DUK_ASSERT(pos >= 0 && pos <= len); + + p_cmp_start += duk_heap_strcache_offset_char2byte(thr, h, (duk_uint_fast32_t) pos); + } + + /* The main comparison can be done using a memcmp() rather than + * doing codepoint comparisons: for CESU-8 strings there is a + * canonical representation for every codepoint. But we do need + * to deal with the char/byte offset translation to find the + * comparison range. + */ + + result = 0; + if (p_cmp_start >= DUK_HSTRING_GET_DATA(h) && + (duk_size_t) (p_cmp_start - (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h)) + blen_search <= DUK_HSTRING_GET_BYTELEN(h)) { + if (duk_memcmp((const void *) p_cmp_start, + (const void *) DUK_HSTRING_GET_DATA(h_search), + (size_t) blen_search) == 0) { + result = 1; + } + } + + duk_push_boolean(thr, result); + return 1; +} +#endif /* DUK_USE_ES6 */ + +#if defined(DUK_USE_ES6) +DUK_INTERNAL duk_ret_t duk_bi_string_prototype_includes(duk_hthread *thr) { + duk_hstring *h; + duk_hstring *h_search; + duk_int_t len; + duk_int_t pos; + + h = duk_push_this_coercible_to_string(thr); + DUK_ASSERT(h != NULL); + + h_search = duk__str_tostring_notregexp(thr, 0); + DUK_ASSERT(h_search != NULL); + + len = (duk_int_t) DUK_HSTRING_GET_CHARLEN(h); + pos = duk_to_int_clamped(thr, 1, 0, len); + DUK_ASSERT(pos >= 0 && pos <= len); + + pos = duk__str_search_shared(thr, h, h_search, pos, 0 /*backwards*/); + duk_push_boolean(thr, pos >= 0); + return 1; +} +#endif /* DUK_USE_ES6 */ +#endif /* DUK_USE_STRING_BUILTIN */ +#line 1 "duk_bi_symbol.c" +/* + * Symbol built-in + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_SYMBOL_BUILTIN) + +/* + * Constructor + */ + +DUK_INTERNAL duk_ret_t duk_bi_symbol_constructor_shared(duk_hthread *thr) { + const duk_uint8_t *desc; + duk_size_t len; + duk_uint8_t *buf; + duk_uint8_t *p; + duk_int_t magic; + + magic = duk_get_current_magic(thr); + if (duk_is_undefined(thr, 0) && (magic == 0)) { + /* Symbol() accepts undefined and empty string, but they are + * treated differently. + */ + desc = NULL; + len = 0; + } else { + /* Symbol.for() coerces undefined to 'undefined' */ + desc = (const duk_uint8_t *) duk_to_lstring(thr, 0, &len); + } + + /* Maximum symbol data length: + * +1 initial byte (0x80 or 0x81) + * +len description + * +1 0xff after description, before unique suffix + * +17 autogenerated unique suffix: 'ffffffff-ffffffff' is longest + * +1 0xff after unique suffix for symbols with undefined description + */ + buf = (duk_uint8_t *) duk_push_fixed_buffer(thr, 1 + len + 1 + 17 + 1); + DUK_ASSERT(buf != NULL); + p = buf + 1; + DUK_ASSERT(desc != NULL || len == 0); /* may be NULL if len is 0 */ + duk_memcpy_unsafe((void *) p, (const void *) desc, len); + p += len; + if (magic == 0) { + /* Symbol(): create unique symbol. Use two 32-bit values + * to avoid dependency on 64-bit types and 64-bit integer + * formatting (at least for now). + */ + if (++thr->heap->sym_counter[0] == 0) { + thr->heap->sym_counter[1]++; + } + p += DUK_SPRINTF((char *) p, "\xFF" "%lx-%lx", + (unsigned long) thr->heap->sym_counter[1], + (unsigned long) thr->heap->sym_counter[0]); + if (desc == NULL) { + /* Special case for 'undefined' description, trailing + * 0xff distinguishes from empty string description, + * but needs minimal special case handling elsewhere. + */ + *p++ = 0xff; + } + buf[0] = 0x81; + } else { + /* Symbol.for(): create a global symbol */ + buf[0] = 0x80; + } + + duk_push_lstring(thr, (const char *) buf, (duk_size_t) (p - buf)); + DUK_DDD(DUK_DDDPRINT("created symbol: %!T", duk_get_tval(thr, -1))); + return 1; +} + +DUK_LOCAL duk_hstring *duk__auto_unbox_symbol(duk_hthread *thr, duk_tval *tv_arg) { + duk_tval *tv; + duk_tval tv_val; + duk_hobject *h_obj; + duk_hstring *h_str; + + DUK_ASSERT(tv_arg != NULL); + + /* XXX: add internal helper: duk_auto_unbox_tval(thr, tv, mask); */ + /* XXX: add internal helper: duk_auto_unbox(thr, tv, idx); */ + + tv = tv_arg; + if (DUK_TVAL_IS_OBJECT(tv)) { + h_obj = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h_obj != NULL); + if (DUK_HOBJECT_GET_CLASS_NUMBER(h_obj) == DUK_HOBJECT_CLASS_SYMBOL) { + if (!duk_hobject_get_internal_value(thr->heap, h_obj, &tv_val)) { + return NULL; + } + tv = &tv_val; + } else { + return NULL; + } + } + + if (!DUK_TVAL_IS_STRING(tv)) { + return NULL; + } + h_str = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h_str != NULL); + + /* Here symbol is more expected than not. */ + if (DUK_UNLIKELY(!DUK_HSTRING_HAS_SYMBOL(h_str))) { + return NULL; + } + + return h_str; +} + +DUK_INTERNAL duk_ret_t duk_bi_symbol_tostring_shared(duk_hthread *thr) { + duk_hstring *h_str; + + h_str = duk__auto_unbox_symbol(thr, DUK_HTHREAD_THIS_PTR(thr)); + if (h_str == NULL) { + return DUK_RET_TYPE_ERROR; + } + + if (duk_get_current_magic(thr) == 0) { + /* .toString() */ + duk_push_symbol_descriptive_string(thr, h_str); + } else { + /* .valueOf() */ + duk_push_hstring(thr, h_str); + } + return 1; +} + +DUK_INTERNAL duk_ret_t duk_bi_symbol_key_for(duk_hthread *thr) { + duk_hstring *h; + const duk_uint8_t *p; + + /* Argument must be a symbol but not checked here. The initial byte + * check will catch non-symbol strings. + */ + h = duk_require_hstring(thr, 0); + DUK_ASSERT(h != NULL); + + p = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h); + DUK_ASSERT(p != NULL); + + /* Even for zero length strings there's at least one NUL byte so + * we can safely check the initial byte. + */ + if (p[0] == 0x80) { + /* Global symbol, return its key (bytes just after the initial byte). */ + duk_push_lstring(thr, (const char *) (p + 1), (duk_size_t) (DUK_HSTRING_GET_BYTELEN(h) - 1)); + return 1; + } else if (p[0] == 0x81 || p[0] == 0x82 || p[0] == 0xff) { + /* Local symbol or hidden symbol, return undefined. */ + return 0; + } + + /* Covers normal strings and unknown initial bytes. */ + return DUK_RET_TYPE_ERROR; +} + +DUK_INTERNAL duk_ret_t duk_bi_symbol_toprimitive(duk_hthread *thr) { + duk_hstring *h_str; + + h_str = duk__auto_unbox_symbol(thr, DUK_HTHREAD_THIS_PTR(thr)); + if (h_str == NULL) { + return DUK_RET_TYPE_ERROR; + } + duk_push_hstring(thr, h_str); + return 1; +} + +#endif /* DUK_USE_SYMBOL_BUILTIN */ +#line 1 "duk_bi_thread.c" +/* + * Thread builtins + */ + +/* #include duk_internal.h -> already included */ + +/* + * Constructor + */ + +#if defined(DUK_USE_COROUTINE_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_thread_constructor(duk_hthread *thr) { + duk_hthread *new_thr; + duk_hobject *func; + + /* Check that the argument is callable; this is not 100% because we + * don't allow native functions to be a thread's initial function. + * Resume will reject such functions in any case. + */ + /* XXX: need a duk_require_func_promote_lfunc() */ + func = duk_require_hobject_promote_lfunc(thr, 0); + DUK_ASSERT(func != NULL); + duk_require_callable(thr, 0); + + duk_push_thread(thr); + new_thr = (duk_hthread *) duk_known_hobject(thr, -1); + new_thr->state = DUK_HTHREAD_STATE_INACTIVE; + + /* push initial function call to new thread stack; this is + * picked up by resume(). + */ + duk_push_hobject(new_thr, func); + + return 1; /* return thread */ +} +#endif + +/* + * Resume a thread. + * + * The thread must be in resumable state, either (a) new thread which hasn't + * yet started, or (b) a thread which has previously yielded. This method + * must be called from an ECMAScript function. + * + * Args: + * - thread + * - value + * - isError (defaults to false) + * + * Note: yield and resume handling is currently asymmetric. + */ + +#if defined(DUK_USE_COROUTINE_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_thread_resume(duk_hthread *ctx) { + duk_hthread *thr = (duk_hthread *) ctx; + duk_hthread *thr_resume; + duk_hobject *caller_func; + duk_small_uint_t is_error; + + DUK_DDD(DUK_DDDPRINT("Duktape.Thread.resume(): thread=%!T, value=%!T, is_error=%!T", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1), + (duk_tval *) duk_get_tval(thr, 2))); + + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); + DUK_ASSERT(thr->heap->curr_thread == thr); + + thr_resume = duk_require_hthread(thr, 0); + DUK_ASSERT(duk_get_top(thr) == 3); + is_error = (duk_small_uint_t) duk_to_boolean_top_pop(thr); + DUK_ASSERT(duk_get_top(thr) == 2); + + /* [ thread value ] */ + + /* + * Thread state and calling context checks + */ + + if (thr->callstack_top < 2) { + DUK_DD(DUK_DDPRINT("resume state invalid: callstack should contain at least 2 entries (caller and Duktape.Thread.resume)")); + goto state_error; + } + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL); /* us */ + DUK_ASSERT(DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr))); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr->parent) != NULL); /* caller */ + + caller_func = DUK_ACT_GET_FUNC(thr->callstack_curr->parent); + if (!DUK_HOBJECT_IS_COMPFUNC(caller_func)) { + DUK_DD(DUK_DDPRINT("resume state invalid: caller must be ECMAScript code")); + goto state_error; + } + + /* Note: there is no requirement that: 'thr->callstack_preventcount == 1' + * like for yield. + */ + + if (thr_resume->state != DUK_HTHREAD_STATE_INACTIVE && + thr_resume->state != DUK_HTHREAD_STATE_YIELDED) { + DUK_DD(DUK_DDPRINT("resume state invalid: target thread must be INACTIVE or YIELDED")); + goto state_error; + } + + DUK_ASSERT(thr_resume->state == DUK_HTHREAD_STATE_INACTIVE || + thr_resume->state == DUK_HTHREAD_STATE_YIELDED); + + /* Further state-dependent pre-checks */ + + if (thr_resume->state == DUK_HTHREAD_STATE_YIELDED) { + /* no pre-checks now, assume a previous yield() has left things in + * tip-top shape (longjmp handler will assert for these). + */ + } else { + duk_hobject *h_fun; + + DUK_ASSERT(thr_resume->state == DUK_HTHREAD_STATE_INACTIVE); + + /* The initial function must be an ECMAScript function (but + * can be bound). We must make sure of that before we longjmp + * because an error in the RESUME handler call processing will + * not be handled very cleanly. + */ + if ((thr_resume->callstack_top != 0) || + (thr_resume->valstack_top - thr_resume->valstack != 1)) { + goto state_error; + } + + duk_push_tval(thr, DUK_GET_TVAL_NEGIDX(thr_resume, -1)); + duk_resolve_nonbound_function(thr); + h_fun = duk_require_hobject(thr, -1); /* reject lightfuncs on purpose */ + if (!DUK_HOBJECT_IS_CALLABLE(h_fun) || !DUK_HOBJECT_IS_COMPFUNC(h_fun)) { + goto state_error; + } + duk_pop(thr); + } + + /* + * The error object has been augmented with a traceback and other + * info from its creation point -- usually another thread. The + * error handler is called here right before throwing, but it also + * runs in the resumer's thread. It might be nice to get a traceback + * from the resumee but this is not the case now. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_THROW) + if (is_error) { + DUK_ASSERT_TOP(thr, 2); /* value (error) is at stack top */ + duk_err_augment_error_throw(thr); /* in resumer's context */ + } +#endif + +#if defined(DUK_USE_DEBUG) + if (is_error) { + DUK_DDD(DUK_DDDPRINT("RESUME ERROR: thread=%!T, value=%!T", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1))); + } else if (thr_resume->state == DUK_HTHREAD_STATE_YIELDED) { + DUK_DDD(DUK_DDDPRINT("RESUME NORMAL: thread=%!T, value=%!T", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1))); + } else { + DUK_DDD(DUK_DDDPRINT("RESUME INITIAL: thread=%!T, value=%!T", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1))); + } +#endif + + thr->heap->lj.type = DUK_LJ_TYPE_RESUME; + + /* lj value2: thread */ + DUK_ASSERT(thr->valstack_bottom < thr->valstack_top); + DUK_TVAL_SET_TVAL_UPDREF(thr, &thr->heap->lj.value2, &thr->valstack_bottom[0]); /* side effects */ + + /* lj value1: value */ + DUK_ASSERT(thr->valstack_bottom + 1 < thr->valstack_top); + DUK_TVAL_SET_TVAL_UPDREF(thr, &thr->heap->lj.value1, &thr->valstack_bottom[1]); /* side effects */ + DUK_TVAL_CHKFAST_INPLACE_SLOW(&thr->heap->lj.value1); + + thr->heap->lj.iserror = is_error; + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* call is from executor, so we know we have a jmpbuf */ + duk_err_longjmp(thr); /* execution resumes in bytecode executor */ + DUK_UNREACHABLE(); + /* Never here, fall through to error (from compiler point of view). */ + + state_error: + DUK_DCERROR_TYPE_INVALID_STATE(thr); +} +#endif + +/* + * Yield the current thread. + * + * The thread must be in yieldable state: it must have a resumer, and there + * must not be any yield-preventing calls (native calls and constructor calls, + * currently) in the thread's call stack (otherwise a resume would not be + * possible later). This method must be called from an ECMAScript function. + * + * Args: + * - value + * - isError (defaults to false) + * + * Note: yield and resume handling is currently asymmetric. + */ + +#if defined(DUK_USE_COROUTINE_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_thread_yield(duk_hthread *thr) { + duk_hobject *caller_func; + duk_small_uint_t is_error; + + DUK_DDD(DUK_DDDPRINT("Duktape.Thread.yield(): value=%!T, is_error=%!T", + (duk_tval *) duk_get_tval(thr, 0), + (duk_tval *) duk_get_tval(thr, 1))); + + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); + DUK_ASSERT(thr->heap->curr_thread == thr); + + DUK_ASSERT(duk_get_top(thr) == 2); + is_error = (duk_small_uint_t) duk_to_boolean_top_pop(thr); + DUK_ASSERT(duk_get_top(thr) == 1); + + /* [ value ] */ + + /* + * Thread state and calling context checks + */ + + if (!thr->resumer) { + DUK_DD(DUK_DDPRINT("yield state invalid: current thread must have a resumer")); + goto state_error; + } + DUK_ASSERT(thr->resumer->state == DUK_HTHREAD_STATE_RESUMED); + + if (thr->callstack_top < 2) { + DUK_DD(DUK_DDPRINT("yield state invalid: callstack should contain at least 2 entries (caller and Duktape.Thread.yield)")); + goto state_error; + } + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL); /* us */ + DUK_ASSERT(DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr))); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr->parent) != NULL); /* caller */ + + caller_func = DUK_ACT_GET_FUNC(thr->callstack_curr->parent); + if (!DUK_HOBJECT_IS_COMPFUNC(caller_func)) { + DUK_DD(DUK_DDPRINT("yield state invalid: caller must be ECMAScript code")); + goto state_error; + } + + DUK_ASSERT(thr->callstack_preventcount >= 1); /* should never be zero, because we (Duktape.Thread.yield) are on the stack */ + if (thr->callstack_preventcount != 1) { + /* Note: the only yield-preventing call is Duktape.Thread.yield(), hence check for 1, not 0 */ + DUK_DD(DUK_DDPRINT("yield state invalid: there must be no yield-preventing calls in current thread callstack (preventcount is %ld)", + (long) thr->callstack_preventcount)); + goto state_error; + } + + /* + * The error object has been augmented with a traceback and other + * info from its creation point -- usually the current thread. + * The error handler, however, is called right before throwing + * and runs in the yielder's thread. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_THROW) + if (is_error) { + DUK_ASSERT_TOP(thr, 1); /* value (error) is at stack top */ + duk_err_augment_error_throw(thr); /* in yielder's context */ + } +#endif + +#if defined(DUK_USE_DEBUG) + if (is_error) { + DUK_DDD(DUK_DDDPRINT("YIELD ERROR: value=%!T", + (duk_tval *) duk_get_tval(thr, 0))); + } else { + DUK_DDD(DUK_DDDPRINT("YIELD NORMAL: value=%!T", + (duk_tval *) duk_get_tval(thr, 0))); + } +#endif + + /* + * Process yield + * + * After longjmp(), processing continues in bytecode executor longjmp + * handler, which will e.g. update thr->resumer to NULL. + */ + + thr->heap->lj.type = DUK_LJ_TYPE_YIELD; + + /* lj value1: value */ + DUK_ASSERT(thr->valstack_bottom < thr->valstack_top); + DUK_TVAL_SET_TVAL_UPDREF(thr, &thr->heap->lj.value1, &thr->valstack_bottom[0]); /* side effects */ + DUK_TVAL_CHKFAST_INPLACE_SLOW(&thr->heap->lj.value1); + + thr->heap->lj.iserror = is_error; + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* call is from executor, so we know we have a jmpbuf */ + duk_err_longjmp(thr); /* execution resumes in bytecode executor */ + DUK_UNREACHABLE(); + /* Never here, fall through to error (from compiler point of view). */ + + state_error: + DUK_DCERROR_TYPE_INVALID_STATE(thr); +} +#endif + +#if defined(DUK_USE_COROUTINE_SUPPORT) +DUK_INTERNAL duk_ret_t duk_bi_thread_current(duk_hthread *thr) { + duk_push_current_thread(thr); + return 1; +} +#endif +#line 1 "duk_bi_thrower.c" +/* + * Type error thrower, E5 Section 13.2.3. + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL duk_ret_t duk_bi_type_error_thrower(duk_hthread *thr) { + DUK_DCERROR_TYPE_INVALID_ARGS(thr); +} +#line 1 "duk_debug_fixedbuffer.c" +/* + * Fixed buffer helper useful for debugging, requires no allocation + * which is critical for debugging. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_DEBUG) + +DUK_INTERNAL void duk_fb_put_bytes(duk_fixedbuffer *fb, const duk_uint8_t *buffer, duk_size_t length) { + duk_size_t avail; + duk_size_t copylen; + + avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset)); + if (length > avail) { + copylen = avail; + fb->truncated = 1; + } else { + copylen = length; + } + duk_memcpy_unsafe(fb->buffer + fb->offset, buffer, copylen); + fb->offset += copylen; +} + +DUK_INTERNAL void duk_fb_put_byte(duk_fixedbuffer *fb, duk_uint8_t x) { + duk_fb_put_bytes(fb, (const duk_uint8_t *) &x, 1); +} + +DUK_INTERNAL void duk_fb_put_cstring(duk_fixedbuffer *fb, const char *x) { + duk_fb_put_bytes(fb, (const duk_uint8_t *) x, (duk_size_t) DUK_STRLEN(x)); +} + +DUK_INTERNAL void duk_fb_sprintf(duk_fixedbuffer *fb, const char *fmt, ...) { + duk_size_t avail; + va_list ap; + + va_start(ap, fmt); + avail = (fb->offset >= fb->length ? (duk_size_t) 0 : (duk_size_t) (fb->length - fb->offset)); + if (avail > 0) { + duk_int_t res = (duk_int_t) DUK_VSNPRINTF((char *) (fb->buffer + fb->offset), avail, fmt, ap); + if (res < 0) { + /* error */ + } else if ((duk_size_t) res >= avail) { + /* (maybe) truncated */ + fb->offset += avail; + if ((duk_size_t) res > avail) { + /* actual chars dropped (not just NUL term) */ + fb->truncated = 1; + } + } else { + /* normal */ + fb->offset += (duk_size_t) res; + } + } + va_end(ap); +} + +DUK_INTERNAL void duk_fb_put_funcptr(duk_fixedbuffer *fb, duk_uint8_t *fptr, duk_size_t fptr_size) { + char buf[64+1]; + duk_debug_format_funcptr(buf, sizeof(buf), fptr, fptr_size); + buf[sizeof(buf) - 1] = (char) 0; + duk_fb_put_cstring(fb, buf); +} + +DUK_INTERNAL duk_bool_t duk_fb_is_full(duk_fixedbuffer *fb) { + return (fb->offset >= fb->length); +} + +#endif /* DUK_USE_DEBUG */ +#line 1 "duk_debug_vsnprintf.c" +/* + * Custom formatter for debug printing, allowing Duktape specific data + * structures (such as tagged values and heap objects) to be printed with + * a nice format string. Because debug printing should not affect execution + * state, formatting here must be independent of execution (see implications + * below) and must not allocate memory. + * + * Custom format tags begin with a '%!' to safely distinguish them from + * standard format tags. The following conversions are supported: + * + * %!T tagged value (duk_tval *) + * %!O heap object (duk_heaphdr *) + * %!I decoded bytecode instruction + * %!C bytecode instruction opcode name (arg is long) + * + * Everything is serialized in a JSON-like manner. The default depth is one + * level, internal prototype is not followed, and internal properties are not + * serialized. The following modifiers change this behavior: + * + * @ print pointers + * # print binary representations (where applicable) + * d deep traversal of own properties (not prototype) + * p follow prototype chain (useless without 'd') + * i include internal properties (other than prototype) + * x hexdump buffers + * h heavy formatting + * + * For instance, the following serializes objects recursively, but does not + * follow the prototype chain nor print internal properties: "%!dO". + * + * Notes: + * + * * Standard snprintf return value semantics seem to vary. This + * implementation returns the number of bytes it actually wrote + * (excluding the null terminator). If retval == buffer size, + * output was truncated (except for corner cases). + * + * * Output format is intentionally different from ECMAScript + * formatting requirements, as formatting here serves debugging + * of internals. + * + * * Depth checking (and updating) is done in each type printer + * separately, to allow them to call each other freely. + * + * * Some pathological structures might take ages to print (e.g. + * self recursion with 100 properties pointing to the object + * itself). To guard against these, each printer also checks + * whether the output buffer is full; if so, early exit. + * + * * Reference loops are detected using a loop stack. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_DEBUG) + +/* #include stdio.h -> already included */ +/* #include stdarg.h -> already included */ +#include <string.h> + +/* list of conversion specifiers that terminate a format tag; + * this is unfortunately guesswork. + */ +#define DUK__ALLOWED_STANDARD_SPECIFIERS "diouxXeEfFgGaAcsCSpnm" + +/* maximum length of standard format tag that we support */ +#define DUK__MAX_FORMAT_TAG_LENGTH 32 + +/* heapobj recursion depth when deep printing is selected */ +#define DUK__DEEP_DEPTH_LIMIT 8 + +/* maximum recursion depth for loop detection stacks */ +#define DUK__LOOP_STACK_DEPTH 256 + +/* must match bytecode defines now; build autogenerate? */ +DUK_LOCAL const char * const duk__bc_optab[256] = { + "LDREG", "STREG", "JUMP", "LDCONST", "LDINT", "LDINTX", "LDTHIS", "LDUNDEF", + "LDNULL", "LDTRUE", "LDFALSE", "GETVAR", "BNOT", "LNOT", "UNM", "UNP", + "EQ_RR", "EQ_CR", "EQ_RC", "EQ_CC", "NEQ_RR", "NEQ_CR", "NEQ_RC", "NEQ_CC", + "SEQ_RR", "SEQ_CR", "SEQ_RC", "SEQ_CC", "SNEQ_RR", "SNEQ_CR", "SNEQ_RC", "SNEQ_CC", + + "GT_RR", "GT_CR", "GT_RC", "GT_CC", "GE_RR", "GE_CR", "GE_RC", "GE_CC", + "LT_RR", "LT_CR", "LT_RC", "LT_CC", "LE_RR", "LE_CR", "LE_RC", "LE_CC", + "IFTRUE_R", "IFTRUE_C", "IFFALSE_R", "IFFALSE_C", "ADD_RR", "ADD_CR", "ADD_RC", "ADD_CC", + "SUB_RR", "SUB_CR", "SUB_RC", "SUB_CC", "MUL_RR", "MUL_CR", "MUL_RC", "MUL_CC", + + "DIV_RR", "DIV_CR", "DIV_RC", "DIV_CC", "MOD_RR", "MOD_CR", "MOD_RC", "MOD_CC", + "EXP_RR", "EXP_CR", "EXP_RC", "EXP_CC", "BAND_RR", "BAND_CR", "BAND_RC", "BAND_CC", + "BOR_RR", "BOR_CR", "BOR_RC", "BOR_CC", "BXOR_RR", "BXOR_CR", "BXOR_RC", "BXOR_CC", + "BASL_RR", "BASL_CR", "BASL_RC", "BASL_CC", "BLSR_RR", "BLSR_CR", "BLSR_RC", "BLSR_CC", + + "BASR_RR", "BASR_CR", "BASR_RC", "BASR_CC", "INSTOF_RR", "INSTOF_CR", "INSTOF_RC", "INSTOF_CC", + "IN_RR", "IN_CR", "IN_RC", "IN_CC", "GETPROP_RR", "GETPROP_CR", "GETPROP_RC", "GETPROP_CC", + "PUTPROP_RR", "PUTPROP_CR", "PUTPROP_RC", "PUTPROP_CC", "DELPROP_RR", "DELPROP_CR", "DELPROP_RC", "DELPROP_CC", + "PREINCR", "PREDECR", "POSTINCR", "POSTDECR", "PREINCV", "PREDECV", "POSTINCV", "POSTDECV", + + "PREINCP_RR", "PREINCP_CR", "PREINCP_RC", "PREINCP_CC", "PREDECP_RR", "PREDECP_CR", "PREDECP_RC", "PREDECP_CC", + "POSTINCP_RR", "POSTINCP_CR", "POSTINCP_RC", "POSTINCP_CC", "POSTDECP_RR", "POSTDECP_CR", "POSTDECP_RC", "POSTDECP_CC", + "DECLVAR_RR", "DECLVAR_CR", "DECLVAR_RC", "DECLVAR_CC", "REGEXP_RR", "REGEXP_RC", "REGEXP_CR", "REGEXP_CC", + "CLOSURE", "TYPEOF", "TYPEOFID", "PUTVAR", "DELVAR", "RETREG", "RETUNDEF", "RETCONST", + + "RETCONSTN", "LABEL", "ENDLABEL", "BREAK", "CONTINUE", "TRYCATCH", "ENDTRY", "ENDCATCH", + "ENDFIN", "THROW", "INVLHS", "CSREG", "CSVAR_RR", "CSVAR_CR", "CSVAR_RC", "CSVAR_CC", + "CALL0", "CALL1", "CALL2", "CALL3", "CALL4", "CALL5", "CALL6", "CALL7", + "CALL8", "CALL9", "CALL10", "CALL11", "CALL12", "CALL13", "CALL14", "CALL15", + + "NEWOBJ", "NEWARR", "MPUTOBJ", "MPUTOBJI", "INITSET", "INITGET", "MPUTARR", "MPUTARRI", + "SETALEN", "INITENUM", "NEXTENUM", "NEWTARGET", "DEBUGGER", "NOP", "INVALID", "UNUSED207", + "GETPROPC_RR", "GETPROPC_CR", "GETPROPC_RC", "GETPROPC_CC", "UNUSED212", "UNUSED213", "UNUSED214", "UNUSED215", + "UNUSED216", "UNUSED217", "UNUSED218", "UNUSED219", "UNUSED220", "UNUSED221", "UNUSED222", "UNUSED223", + + "UNUSED224", "UNUSED225", "UNUSED226", "UNUSED227", "UNUSED228", "UNUSED229", "UNUSED230", "UNUSED231", + "UNUSED232", "UNUSED233", "UNUSED234", "UNUSED235", "UNUSED236", "UNUSED237", "UNUSED238", "UNUSED239", + "UNUSED240", "UNUSED241", "UNUSED242", "UNUSED243", "UNUSED244", "UNUSED245", "UNUSED246", "UNUSED247", + "UNUSED248", "UNUSED249", "UNUSED250", "UNUSED251", "UNUSED252", "UNUSED253", "UNUSED254", "UNUSED255" +}; + +typedef struct duk__dprint_state duk__dprint_state; +struct duk__dprint_state { + duk_fixedbuffer *fb; + + /* loop_stack_index could be perhaps be replaced by 'depth', but it's nice + * to not couple these two mechanisms unnecessarily. + */ + duk_hobject *loop_stack[DUK__LOOP_STACK_DEPTH]; + duk_int_t loop_stack_index; + duk_int_t loop_stack_limit; + + duk_int_t depth; + duk_int_t depth_limit; + + duk_bool_t pointer; + duk_bool_t heavy; + duk_bool_t binary; + duk_bool_t follow_proto; + duk_bool_t internal; + duk_bool_t hexdump; +}; + +/* helpers */ +DUK_LOCAL_DECL void duk__print_hstring(duk__dprint_state *st, duk_hstring *k, duk_bool_t quotes); +DUK_LOCAL_DECL void duk__print_hobject(duk__dprint_state *st, duk_hobject *h); +DUK_LOCAL_DECL void duk__print_hbuffer(duk__dprint_state *st, duk_hbuffer *h); +DUK_LOCAL_DECL void duk__print_tval(duk__dprint_state *st, duk_tval *tv); +DUK_LOCAL_DECL void duk__print_instr(duk__dprint_state *st, duk_instr_t ins); +DUK_LOCAL_DECL void duk__print_heaphdr(duk__dprint_state *st, duk_heaphdr *h); +DUK_LOCAL_DECL void duk__print_shared_heaphdr(duk__dprint_state *st, duk_heaphdr *h); +DUK_LOCAL_DECL void duk__print_shared_heaphdr_string(duk__dprint_state *st, duk_heaphdr_string *h); + +DUK_LOCAL void duk__print_shared_heaphdr(duk__dprint_state *st, duk_heaphdr *h) { + duk_fixedbuffer *fb = st->fb; + + if (st->heavy) { + duk_fb_sprintf(fb, "(%p)", (void *) h); + } + + if (!h) { + return; + } + + if (st->binary) { + duk_size_t i; + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LBRACKET); + for (i = 0; i < (duk_size_t) sizeof(*h); i++) { + duk_fb_sprintf(fb, "%02lx", (unsigned long) ((duk_uint8_t *)h)[i]); + } + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RBRACKET); + } + +#if defined(DUK_USE_REFERENCE_COUNTING) /* currently implicitly also DUK_USE_DOUBLE_LINKED_HEAP */ + if (st->heavy) { + duk_fb_sprintf(fb, "[h_next=%p,h_prev=%p,h_refcount=%lu,h_flags=%08lx,type=%ld," + "reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]", + (void *) DUK_HEAPHDR_GET_NEXT(NULL, h), + (void *) DUK_HEAPHDR_GET_PREV(NULL, h), + (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(h), + (unsigned long) DUK_HEAPHDR_GET_FLAGS(h), + (long) DUK_HEAPHDR_GET_TYPE(h), + (long) (DUK_HEAPHDR_HAS_REACHABLE(h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_TEMPROOT(h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZABLE(h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZED(h) ? 1 : 0)); + } +#else + if (st->heavy) { + duk_fb_sprintf(fb, "[h_next=%p,h_flags=%08lx,type=%ld,reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]", + (void *) DUK_HEAPHDR_GET_NEXT(NULL, h), + (unsigned long) DUK_HEAPHDR_GET_FLAGS(h), + (long) DUK_HEAPHDR_GET_TYPE(h), + (long) (DUK_HEAPHDR_HAS_REACHABLE(h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_TEMPROOT(h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZABLE(h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZED(h) ? 1 : 0)); + } +#endif +} + +DUK_LOCAL void duk__print_shared_heaphdr_string(duk__dprint_state *st, duk_heaphdr_string *h) { + duk_fixedbuffer *fb = st->fb; + + if (st->heavy) { + duk_fb_sprintf(fb, "(%p)", (void *) h); + } + + if (!h) { + return; + } + + if (st->binary) { + duk_size_t i; + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LBRACKET); + for (i = 0; i < (duk_size_t) sizeof(*h); i++) { + duk_fb_sprintf(fb, "%02lx", (unsigned long) ((duk_uint8_t *)h)[i]); + } + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RBRACKET); + } + +#if defined(DUK_USE_REFERENCE_COUNTING) + if (st->heavy) { + duk_fb_sprintf(fb, "[h_refcount=%lu,h_flags=%08lx,type=%ld,reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]", + (unsigned long) DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h), + (unsigned long) DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) h), + (long) DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) h), + (long) (DUK_HEAPHDR_HAS_REACHABLE((duk_heaphdr *) h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_TEMPROOT((duk_heaphdr *) h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZABLE((duk_heaphdr *) h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) h) ? 1 : 0)); + } +#else + if (st->heavy) { + duk_fb_sprintf(fb, "[h_flags=%08lx,type=%ld,reachable=%ld,temproot=%ld,finalizable=%ld,finalized=%ld]", + (unsigned long) DUK_HEAPHDR_GET_FLAGS((duk_heaphdr *) h), + (long) DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) h), + (long) (DUK_HEAPHDR_HAS_REACHABLE((duk_heaphdr *) h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_TEMPROOT((duk_heaphdr *) h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZABLE((duk_heaphdr *) h) ? 1 : 0), + (long) (DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) h) ? 1 : 0)); + } +#endif +} + +DUK_LOCAL void duk__print_hstring(duk__dprint_state *st, duk_hstring *h, duk_bool_t quotes) { + duk_fixedbuffer *fb = st->fb; + const duk_uint8_t *p; + const duk_uint8_t *p_end; + + /* terminal type: no depth check */ + + if (duk_fb_is_full(fb)) { + return; + } + + duk__print_shared_heaphdr_string(st, &h->hdr); + + if (!h) { + duk_fb_put_cstring(fb, "NULL"); + return; + } + + p = DUK_HSTRING_GET_DATA(h); + p_end = p + DUK_HSTRING_GET_BYTELEN(h); + + if (p_end > p && p[0] == DUK_ASC_UNDERSCORE) { + /* If property key begins with underscore, encode it with + * forced quotes (e.g. "_Foo") to distinguish it from encoded + * internal properties (e.g. \x82Bar -> _Bar). + */ + quotes = 1; + } + + if (quotes) { + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_DOUBLEQUOTE); + } + while (p < p_end) { + duk_uint8_t ch = *p++; + + /* two special escapes: '\' and '"', other printables as is */ + if (ch == '\\') { + duk_fb_sprintf(fb, "\\\\"); + } else if (ch == '"') { + duk_fb_sprintf(fb, "\\\""); + } else if (ch >= 0x20 && ch <= 0x7e) { + duk_fb_put_byte(fb, ch); + } else if (ch == 0x82 && !quotes) { + /* encode \x82Bar as _Bar if no quotes are + * applied, this is for readable internal keys. + */ + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_UNDERSCORE); + } else { + duk_fb_sprintf(fb, "\\x%02lx", (unsigned long) ch); + } + } + if (quotes) { + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_DOUBLEQUOTE); + } +#if defined(DUK_USE_REFERENCE_COUNTING) + /* XXX: limit to quoted strings only, to save keys from being cluttered? */ + duk_fb_sprintf(fb, "/%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(&h->hdr)); +#endif +} + +#define DUK__COMMA() do { \ + if (first) { \ + first = 0; \ + } else { \ + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_COMMA); \ + } \ + } while (0) + +DUK_LOCAL void duk__print_hobject(duk__dprint_state *st, duk_hobject *h) { + duk_fixedbuffer *fb = st->fb; + duk_uint_fast32_t i; + duk_tval *tv; + duk_hstring *key; + duk_bool_t first = 1; + const char *brace1 = "{"; + const char *brace2 = "}"; + duk_bool_t pushed_loopstack = 0; + + if (duk_fb_is_full(fb)) { + return; + } + + duk__print_shared_heaphdr(st, &h->hdr); + + if (h && DUK_HOBJECT_HAS_ARRAY_PART(h)) { + brace1 = "["; + brace2 = "]"; + } + + if (!h) { + duk_fb_put_cstring(fb, "NULL"); + goto finished; + } + + if (st->depth >= st->depth_limit) { + const char *subtype = "generic"; + + if (DUK_HOBJECT_IS_COMPFUNC(h)) { + subtype = "compfunc"; + } else if (DUK_HOBJECT_IS_NATFUNC(h)) { + subtype = "natfunc"; + } else if (DUK_HOBJECT_IS_THREAD(h)) { + subtype = "thread"; + } else if (DUK_HOBJECT_IS_BUFOBJ(h)) { + subtype = "bufobj"; + } else if (DUK_HOBJECT_IS_ARRAY(h)) { + subtype = "array"; + } + duk_fb_sprintf(fb, "%sobject/%s %p%s", (const char *) brace1, subtype, (void *) h, (const char *) brace2); + return; + } + + for (i = 0; i < (duk_uint_fast32_t) st->loop_stack_index; i++) { + if (st->loop_stack[i] == h) { + duk_fb_sprintf(fb, "%sLOOP:%p%s", (const char *) brace1, (void *) h, (const char *) brace2); + return; + } + } + + /* after this, return paths should 'goto finished' for decrement */ + st->depth++; + + if (st->loop_stack_index >= st->loop_stack_limit) { + duk_fb_sprintf(fb, "%sOUT-OF-LOOP-STACK%s", (const char *) brace1, (const char *) brace2); + goto finished; + } + st->loop_stack[st->loop_stack_index++] = h; + pushed_loopstack = 1; + + /* + * Notation: double underscore used for internal properties which are not + * stored in the property allocation (e.g. '__valstack'). + */ + + duk_fb_put_cstring(fb, brace1); + + if (DUK_HOBJECT_GET_PROPS(NULL, h)) { + duk_uint32_t a_limit; + + a_limit = DUK_HOBJECT_GET_ASIZE(h); + if (st->internal) { + /* dump all allocated entries, unused entries print as 'unused', + * note that these may extend beyond current 'length' and look + * a bit funny. + */ + } else { + /* leave out trailing 'unused' elements */ + while (a_limit > 0) { + tv = DUK_HOBJECT_A_GET_VALUE_PTR(NULL, h, a_limit - 1); + if (!DUK_TVAL_IS_UNUSED(tv)) { + break; + } + a_limit--; + } + } + + for (i = 0; i < a_limit; i++) { + tv = DUK_HOBJECT_A_GET_VALUE_PTR(NULL, h, i); + DUK__COMMA(); + duk__print_tval(st, tv); + } + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(h); i++) { + key = DUK_HOBJECT_E_GET_KEY(NULL, h, i); + if (!key) { + continue; + } + if (!st->internal && DUK_HSTRING_HAS_HIDDEN(key)) { + continue; + } + DUK__COMMA(); + duk__print_hstring(st, key, 0); + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_COLON); + if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(NULL, h, i)) { + duk_fb_sprintf(fb, "[get:%p,set:%p]", + (void *) DUK_HOBJECT_E_GET_VALUE(NULL, h, i).a.get, + (void *) DUK_HOBJECT_E_GET_VALUE(NULL, h, i).a.set); + } else { + tv = &DUK_HOBJECT_E_GET_VALUE(NULL, h, i).v; + duk__print_tval(st, tv); + } + if (st->heavy) { + duk_fb_sprintf(fb, "<%02lx>", (unsigned long) DUK_HOBJECT_E_GET_FLAGS(NULL, h, i)); + } + } + } + if (st->internal) { + if (DUK_HOBJECT_IS_ARRAY(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__array:true"); + } + if (DUK_HOBJECT_HAS_EXTENSIBLE(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__extensible:true"); + } + if (DUK_HOBJECT_HAS_CONSTRUCTABLE(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__constructable:true"); + } + if (DUK_HOBJECT_HAS_BOUNDFUNC(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__boundfunc:true"); + } + if (DUK_HOBJECT_HAS_COMPFUNC(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__compfunc:true"); + } + if (DUK_HOBJECT_HAS_NATFUNC(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__natfunc:true"); + } + if (DUK_HOBJECT_HAS_BUFOBJ(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__bufobj:true"); + } + if (DUK_HOBJECT_IS_THREAD(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__thread:true"); + } + if (DUK_HOBJECT_HAS_ARRAY_PART(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__array_part:true"); + } + if (DUK_HOBJECT_HAS_STRICT(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__strict:true"); + } + if (DUK_HOBJECT_HAS_NOTAIL(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__notail:true"); + } + if (DUK_HOBJECT_HAS_NEWENV(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__newenv:true"); + } + if (DUK_HOBJECT_HAS_NAMEBINDING(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__namebinding:true"); + } + if (DUK_HOBJECT_HAS_CREATEARGS(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__createargs:true"); + } + if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_array:true"); + } + if (DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_stringobj:true"); + } + if (DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_arguments:true"); + } + if (DUK_HOBJECT_IS_BUFOBJ(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_bufobj:true"); + } + if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h)) { + DUK__COMMA(); duk_fb_sprintf(fb, "__exotic_proxyobj:true"); + } + } + + if (st->internal && DUK_HOBJECT_IS_ARRAY(h)) { + duk_harray *a = (duk_harray *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__length:%ld", (long) a->length); + DUK__COMMA(); duk_fb_sprintf(fb, "__length_nonwritable:%ld", (long) a->length_nonwritable); + } else if (st->internal && DUK_HOBJECT_IS_COMPFUNC(h)) { + duk_hcompfunc *f = (duk_hcompfunc *) h; + DUK__COMMA(); duk_fb_put_cstring(fb, "__data:"); + duk__print_hbuffer(st, (duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA(NULL, f)); + DUK__COMMA(); duk_fb_put_cstring(fb, "__lexenv:"); duk__print_hobject(st, DUK_HCOMPFUNC_GET_LEXENV(NULL, f)); + DUK__COMMA(); duk_fb_put_cstring(fb, "__varenv:"); duk__print_hobject(st, DUK_HCOMPFUNC_GET_VARENV(NULL, f)); + DUK__COMMA(); duk_fb_sprintf(fb, "__nregs:%ld", (long) f->nregs); + DUK__COMMA(); duk_fb_sprintf(fb, "__nargs:%ld", (long) f->nargs); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + DUK__COMMA(); duk_fb_sprintf(fb, "__start_line:%ld", (long) f->start_line); + DUK__COMMA(); duk_fb_sprintf(fb, "__end_line:%ld", (long) f->end_line); +#endif + DUK__COMMA(); duk_fb_put_cstring(fb, "__data:"); + duk__print_hbuffer(st, (duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA(NULL, f)); + } else if (st->internal && DUK_HOBJECT_IS_NATFUNC(h)) { + duk_hnatfunc *f = (duk_hnatfunc *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__func:"); + duk_fb_put_funcptr(fb, (duk_uint8_t *) &f->func, sizeof(f->func)); + DUK__COMMA(); duk_fb_sprintf(fb, "__nargs:%ld", (long) f->nargs); + DUK__COMMA(); duk_fb_sprintf(fb, "__magic:%ld", (long) f->magic); + } else if (st->internal && DUK_HOBJECT_IS_DECENV(h)) { + duk_hdecenv *e = (duk_hdecenv *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__thread:"); duk__print_hobject(st, (duk_hobject *) e->thread); + DUK__COMMA(); duk_fb_sprintf(fb, "__varmap:"); duk__print_hobject(st, (duk_hobject *) e->varmap); + DUK__COMMA(); duk_fb_sprintf(fb, "__regbase_byteoff:%ld", (long) e->regbase_byteoff); + } else if (st->internal && DUK_HOBJECT_IS_OBJENV(h)) { + duk_hobjenv *e = (duk_hobjenv *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__target:"); duk__print_hobject(st, (duk_hobject *) e->target); + DUK__COMMA(); duk_fb_sprintf(fb, "__has_this:%ld", (long) e->has_this); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + } else if (st->internal && DUK_HOBJECT_IS_BUFOBJ(h)) { + duk_hbufobj *b = (duk_hbufobj *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__buf:"); + duk__print_hbuffer(st, (duk_hbuffer *) b->buf); + DUK__COMMA(); duk_fb_sprintf(fb, "__buf_prop:"); + duk__print_hobject(st, (duk_hobject *) b->buf_prop); + DUK__COMMA(); duk_fb_sprintf(fb, "__offset:%ld", (long) b->offset); + DUK__COMMA(); duk_fb_sprintf(fb, "__length:%ld", (long) b->length); + DUK__COMMA(); duk_fb_sprintf(fb, "__shift:%ld", (long) b->shift); + DUK__COMMA(); duk_fb_sprintf(fb, "__elemtype:%ld", (long) b->elem_type); +#endif + } else if (st->internal && DUK_HOBJECT_IS_PROXY(h)) { + duk_hproxy *p = (duk_hproxy *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__target:"); + duk__print_hobject(st, p->target); + DUK__COMMA(); duk_fb_sprintf(fb, "__handler:"); + duk__print_hobject(st, p->handler); + } else if (st->internal && DUK_HOBJECT_IS_THREAD(h)) { + duk_hthread *t = (duk_hthread *) h; + DUK__COMMA(); duk_fb_sprintf(fb, "__ptr_curr_pc:%p", (void *) t->ptr_curr_pc); + DUK__COMMA(); duk_fb_sprintf(fb, "__heap:%p", (void *) t->heap); + DUK__COMMA(); duk_fb_sprintf(fb, "__strict:%ld", (long) t->strict); + DUK__COMMA(); duk_fb_sprintf(fb, "__state:%ld", (long) t->state); + DUK__COMMA(); duk_fb_sprintf(fb, "__unused1:%ld", (long) t->unused1); + DUK__COMMA(); duk_fb_sprintf(fb, "__unused2:%ld", (long) t->unused2); + DUK__COMMA(); duk_fb_sprintf(fb, "__valstack:%p", (void *) t->valstack); + DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_end:%p/%ld", (void *) t->valstack_end, (long) (t->valstack_end - t->valstack)); + DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_alloc_end:%p/%ld", (void *) t->valstack_alloc_end, (long) (t->valstack_alloc_end - t->valstack)); + DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_bottom:%p/%ld", (void *) t->valstack_bottom, (long) (t->valstack_bottom - t->valstack)); + DUK__COMMA(); duk_fb_sprintf(fb, "__valstack_top:%p/%ld", (void *) t->valstack_top, (long) (t->valstack_top - t->valstack)); + DUK__COMMA(); duk_fb_sprintf(fb, "__callstack_curr:%p", (void *) t->callstack_curr); + DUK__COMMA(); duk_fb_sprintf(fb, "__callstack_top:%ld", (long) t->callstack_top); + DUK__COMMA(); duk_fb_sprintf(fb, "__callstack_preventcount:%ld", (long) t->callstack_preventcount); + DUK__COMMA(); duk_fb_sprintf(fb, "__resumer:"); duk__print_hobject(st, (duk_hobject *) t->resumer); + DUK__COMMA(); duk_fb_sprintf(fb, "__compile_ctx:%p", (void *) t->compile_ctx); +#if defined(DUK_USE_INTERRUPT_COUNTER) + DUK__COMMA(); duk_fb_sprintf(fb, "__interrupt_counter:%ld", (long) t->interrupt_counter); + DUK__COMMA(); duk_fb_sprintf(fb, "__interrupt_init:%ld", (long) t->interrupt_init); +#endif + + /* XXX: print built-ins array? */ + + } +#if defined(DUK_USE_REFERENCE_COUNTING) + if (st->internal) { + DUK__COMMA(); duk_fb_sprintf(fb, "__refcount:%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h)); + } +#endif + if (st->internal) { + DUK__COMMA(); duk_fb_sprintf(fb, "__class:%ld", (long) DUK_HOBJECT_GET_CLASS_NUMBER(h)); + } + + DUK__COMMA(); duk_fb_sprintf(fb, "__heapptr:%p", (void *) h); /* own pointer */ + + /* prototype should be last, for readability */ + if (DUK_HOBJECT_GET_PROTOTYPE(NULL, h)) { + if (st->follow_proto) { + DUK__COMMA(); duk_fb_put_cstring(fb, "__prototype:"); duk__print_hobject(st, DUK_HOBJECT_GET_PROTOTYPE(NULL, h)); + } else { + DUK__COMMA(); duk_fb_sprintf(fb, "__prototype:%p", (void *) DUK_HOBJECT_GET_PROTOTYPE(NULL, h)); + } + } + + duk_fb_put_cstring(fb, brace2); + +#if defined(DUK_USE_HOBJECT_HASH_PART) + if (st->heavy && DUK_HOBJECT_GET_HSIZE(h) > 0) { + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LANGLE); + for (i = 0; i < DUK_HOBJECT_GET_HSIZE(h); i++) { + duk_uint_t h_idx = DUK_HOBJECT_H_GET_INDEX(NULL, h, i); + if (i > 0) { + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_COMMA); + } + if (h_idx == DUK_HOBJECT_HASHIDX_UNUSED) { + duk_fb_sprintf(fb, "u"); + } else if (h_idx == DUK_HOBJECT_HASHIDX_DELETED) { + duk_fb_sprintf(fb, "d"); + } else { + duk_fb_sprintf(fb, "%ld", (long) h_idx); + } + } + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RANGLE); + } +#endif + + finished: + st->depth--; + if (pushed_loopstack) { + st->loop_stack_index--; + st->loop_stack[st->loop_stack_index] = NULL; + } +} + +DUK_LOCAL void duk__print_hbuffer(duk__dprint_state *st, duk_hbuffer *h) { + duk_fixedbuffer *fb = st->fb; + duk_size_t i, n; + duk_uint8_t *p; + + if (duk_fb_is_full(fb)) { + return; + } + + /* terminal type: no depth check */ + + if (!h) { + duk_fb_put_cstring(fb, "NULL"); + return; + } + + if (DUK_HBUFFER_HAS_DYNAMIC(h)) { + if (DUK_HBUFFER_HAS_EXTERNAL(h)) { + duk_hbuffer_external *g = (duk_hbuffer_external *) h; + duk_fb_sprintf(fb, "buffer:external:%p:%ld", + (void *) DUK_HBUFFER_EXTERNAL_GET_DATA_PTR(NULL, g), + (long) DUK_HBUFFER_EXTERNAL_GET_SIZE(g)); + } else { + duk_hbuffer_dynamic *g = (duk_hbuffer_dynamic *) h; + duk_fb_sprintf(fb, "buffer:dynamic:%p:%ld", + (void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(NULL, g), + (long) DUK_HBUFFER_DYNAMIC_GET_SIZE(g)); + } + } else { + duk_fb_sprintf(fb, "buffer:fixed:%ld", (long) DUK_HBUFFER_GET_SIZE(h)); + } + +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_fb_sprintf(fb, "/%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(&h->hdr)); +#endif + + if (st->hexdump) { + duk_fb_sprintf(fb, "=["); + n = DUK_HBUFFER_GET_SIZE(h); + p = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(NULL, h); + for (i = 0; i < n; i++) { + duk_fb_sprintf(fb, "%02lx", (unsigned long) p[i]); + } + duk_fb_sprintf(fb, "]"); + } +} + +DUK_LOCAL void duk__print_heaphdr(duk__dprint_state *st, duk_heaphdr *h) { + duk_fixedbuffer *fb = st->fb; + + if (duk_fb_is_full(fb)) { + return; + } + + if (!h) { + duk_fb_put_cstring(fb, "NULL"); + return; + } + + switch (DUK_HEAPHDR_GET_TYPE(h)) { + case DUK_HTYPE_STRING: + duk__print_hstring(st, (duk_hstring *) h, 1); + break; + case DUK_HTYPE_OBJECT: + duk__print_hobject(st, (duk_hobject *) h); + break; + case DUK_HTYPE_BUFFER: + duk__print_hbuffer(st, (duk_hbuffer *) h); + break; + default: + duk_fb_sprintf(fb, "[unknown htype %ld]", (long) DUK_HEAPHDR_GET_TYPE(h)); + break; + } +} + +DUK_LOCAL void duk__print_tval(duk__dprint_state *st, duk_tval *tv) { + duk_fixedbuffer *fb = st->fb; + + if (duk_fb_is_full(fb)) { + return; + } + + /* depth check is done when printing an actual type */ + + if (st->heavy) { + duk_fb_sprintf(fb, "(%p)", (void *) tv); + } + + if (!tv) { + duk_fb_put_cstring(fb, "NULL"); + return; + } + + if (st->binary) { + duk_size_t i; + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LBRACKET); + for (i = 0; i < (duk_size_t) sizeof(*tv); i++) { + duk_fb_sprintf(fb, "%02lx", (unsigned long) ((duk_uint8_t *)tv)[i]); + } + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RBRACKET); + } + + if (st->heavy) { + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_LANGLE); + } + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: { + duk_fb_put_cstring(fb, "undefined"); + break; + } + case DUK_TAG_UNUSED: { + duk_fb_put_cstring(fb, "unused"); + break; + } + case DUK_TAG_NULL: { + duk_fb_put_cstring(fb, "null"); + break; + } + case DUK_TAG_BOOLEAN: { + duk_fb_put_cstring(fb, DUK_TVAL_GET_BOOLEAN(tv) ? "true" : "false"); + break; + } + case DUK_TAG_STRING: { + /* Note: string is a terminal heap object, so no depth check here */ + duk__print_hstring(st, DUK_TVAL_GET_STRING(tv), 1); + break; + } + case DUK_TAG_OBJECT: { + duk__print_hobject(st, DUK_TVAL_GET_OBJECT(tv)); + break; + } + case DUK_TAG_BUFFER: { + duk__print_hbuffer(st, DUK_TVAL_GET_BUFFER(tv)); + break; + } + case DUK_TAG_POINTER: { + duk_fb_sprintf(fb, "pointer:%p", (void *) DUK_TVAL_GET_POINTER(tv)); + break; + } + case DUK_TAG_LIGHTFUNC: { + duk_c_function func; + duk_small_uint_t lf_flags; + + DUK_TVAL_GET_LIGHTFUNC(tv, func, lf_flags); + duk_fb_sprintf(fb, "lightfunc:"); + duk_fb_put_funcptr(fb, (duk_uint8_t *) &func, sizeof(func)); + duk_fb_sprintf(fb, ":%04lx", (long) lf_flags); + break; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + duk_fb_sprintf(fb, "%.18g_F", (double) DUK_TVAL_GET_NUMBER(tv)); + break; +#endif + default: { + /* IEEE double is approximately 16 decimal digits; print a couple extra */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + duk_fb_sprintf(fb, "%.18g", (double) DUK_TVAL_GET_NUMBER(tv)); + break; + } + } + if (st->heavy) { + duk_fb_put_byte(fb, (duk_uint8_t) DUK_ASC_RANGLE); + } +} + +DUK_LOCAL void duk__print_instr(duk__dprint_state *st, duk_instr_t ins) { + duk_fixedbuffer *fb = st->fb; + duk_small_int_t op; + const char *op_name; + + op = (duk_small_int_t) DUK_DEC_OP(ins); + op_name = duk__bc_optab[op]; + + /* XXX: option to fix opcode length so it lines up nicely */ + + if (op == DUK_OP_JUMP) { + duk_int_t diff1 = (duk_int_t) (DUK_DEC_ABC(ins) - DUK_BC_JUMP_BIAS); /* from next pc */ + duk_int_t diff2 = diff1 + 1; /* from curr pc */ + + duk_fb_sprintf(fb, "%s %ld (to pc%c%ld)", + (const char *) op_name, (long) diff1, + (int) (diff2 >= 0 ? '+' : '-'), /* char format: use int */ + (long) (diff2 >= 0 ? diff2 : -diff2)); + } else { + duk_fb_sprintf(fb, "%s %ld, %ld, %ld", + (const char *) op_name, (long) DUK_DEC_A(ins), + (long) DUK_DEC_B(ins), (long) DUK_DEC_C(ins)); + } +} + +DUK_LOCAL void duk__print_opcode(duk__dprint_state *st, duk_small_int_t opcode) { + duk_fixedbuffer *fb = st->fb; + + if (opcode < DUK_BC_OP_MIN || opcode > DUK_BC_OP_MAX) { + duk_fb_sprintf(fb, "?(%ld)", (long) opcode); + } else { + duk_fb_sprintf(fb, "%s", (const char *) duk__bc_optab[opcode]); + } +} + +DUK_INTERNAL duk_int_t duk_debug_vsnprintf(char *str, duk_size_t size, const char *format, va_list ap) { + duk_fixedbuffer fb; + const char *p = format; + const char *p_end = p + DUK_STRLEN(format); + duk_int_t retval; + + duk_memzero(&fb, sizeof(fb)); + fb.buffer = (duk_uint8_t *) str; + fb.length = size; + fb.offset = 0; + fb.truncated = 0; + + while (p < p_end) { + char ch = *p++; + const char *p_begfmt = NULL; + duk_bool_t got_exclamation = 0; + duk_bool_t got_long = 0; /* %lf, %ld etc */ + duk__dprint_state st; + + if (ch != DUK_ASC_PERCENT) { + duk_fb_put_byte(&fb, (duk_uint8_t) ch); + continue; + } + + /* + * Format tag parsing. Since we don't understand all the + * possible format tags allowed, we just scan for a terminating + * specifier and keep track of relevant modifiers that we do + * understand. See man 3 printf. + */ + + duk_memzero(&st, sizeof(st)); + st.fb = &fb; + st.depth = 0; + st.depth_limit = 1; + st.loop_stack_index = 0; + st.loop_stack_limit = DUK__LOOP_STACK_DEPTH; + + p_begfmt = p - 1; + while (p < p_end) { + ch = *p++; + + if (ch == DUK_ASC_STAR) { + /* unsupported: would consume multiple args */ + goto format_error; + } else if (ch == DUK_ASC_PERCENT) { + duk_fb_put_byte(&fb, (duk_uint8_t) DUK_ASC_PERCENT); + break; + } else if (ch == DUK_ASC_EXCLAMATION) { + got_exclamation = 1; + } else if (!got_exclamation && ch == DUK_ASC_LC_L) { + got_long = 1; + } else if (got_exclamation && ch == DUK_ASC_LC_D) { + st.depth_limit = DUK__DEEP_DEPTH_LIMIT; + } else if (got_exclamation && ch == DUK_ASC_LC_P) { + st.follow_proto = 1; + } else if (got_exclamation && ch == DUK_ASC_LC_I) { + st.internal = 1; + } else if (got_exclamation && ch == DUK_ASC_LC_X) { + st.hexdump = 1; + } else if (got_exclamation && ch == DUK_ASC_LC_H) { + st.heavy = 1; + } else if (got_exclamation && ch == DUK_ASC_ATSIGN) { + st.pointer = 1; + } else if (got_exclamation && ch == DUK_ASC_HASH) { + st.binary = 1; + } else if (got_exclamation && ch == DUK_ASC_UC_T) { + duk_tval *t = va_arg(ap, duk_tval *); + if (st.pointer && !st.heavy) { + duk_fb_sprintf(&fb, "(%p)", (void *) t); + } + duk__print_tval(&st, t); + break; + } else if (got_exclamation && ch == DUK_ASC_UC_O) { + duk_heaphdr *t = va_arg(ap, duk_heaphdr *); + if (st.pointer && !st.heavy) { + duk_fb_sprintf(&fb, "(%p)", (void *) t); + } + duk__print_heaphdr(&st, t); + break; + } else if (got_exclamation && ch == DUK_ASC_UC_I) { + duk_instr_t t = va_arg(ap, duk_instr_t); + duk__print_instr(&st, t); + break; + } else if (got_exclamation && ch == DUK_ASC_UC_C) { + long t = va_arg(ap, long); + duk__print_opcode(&st, (duk_small_int_t) t); + break; + } else if (!got_exclamation && strchr(DUK__ALLOWED_STANDARD_SPECIFIERS, (int) ch)) { + char fmtbuf[DUK__MAX_FORMAT_TAG_LENGTH]; + duk_size_t fmtlen; + + DUK_ASSERT(p >= p_begfmt); + fmtlen = (duk_size_t) (p - p_begfmt); + if (fmtlen >= sizeof(fmtbuf)) { + /* format is too large, abort */ + goto format_error; + } + duk_memzero(fmtbuf, sizeof(fmtbuf)); + duk_memcpy(fmtbuf, p_begfmt, fmtlen); + + /* assume exactly 1 arg, which is why '*' is forbidden; arg size still + * depends on type though. + */ + + if (ch == DUK_ASC_LC_F || ch == DUK_ASC_LC_G || ch == DUK_ASC_LC_E) { + /* %f and %lf both consume a 'long' */ + double arg = va_arg(ap, double); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_D && got_long) { + /* %ld */ + long arg = va_arg(ap, long); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_D) { + /* %d; only 16 bits are guaranteed */ + int arg = va_arg(ap, int); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_U && got_long) { + /* %lu */ + unsigned long arg = va_arg(ap, unsigned long); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_U) { + /* %u; only 16 bits are guaranteed */ + unsigned int arg = va_arg(ap, unsigned int); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_X && got_long) { + /* %lx */ + unsigned long arg = va_arg(ap, unsigned long); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_X) { + /* %x; only 16 bits are guaranteed */ + unsigned int arg = va_arg(ap, unsigned int); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else if (ch == DUK_ASC_LC_S) { + /* %s */ + const char *arg = va_arg(ap, const char *); + if (arg == NULL) { + /* '%s' and NULL is not portable, so special case + * it for debug printing. + */ + duk_fb_sprintf(&fb, "NULL"); + } else { + duk_fb_sprintf(&fb, fmtbuf, arg); + } + } else if (ch == DUK_ASC_LC_P) { + /* %p */ + void *arg = va_arg(ap, void *); + if (arg == NULL) { + /* '%p' and NULL is portable, but special case it + * anyway to get a standard NULL marker in logs. + */ + duk_fb_sprintf(&fb, "NULL"); + } else { + duk_fb_sprintf(&fb, fmtbuf, arg); + } + } else if (ch == DUK_ASC_LC_C) { + /* '%c', passed concretely as int */ + int arg = va_arg(ap, int); + duk_fb_sprintf(&fb, fmtbuf, arg); + } else { + /* Should not happen. */ + duk_fb_sprintf(&fb, "INVALID-FORMAT(%s)", (const char *) fmtbuf); + } + break; + } else { + /* ignore */ + } + } + } + goto done; + + format_error: + duk_fb_put_cstring(&fb, "FMTERR"); + /* fall through */ + + done: + retval = (duk_int_t) fb.offset; + duk_fb_put_byte(&fb, (duk_uint8_t) 0); + + /* return total chars written excluding terminator */ + return retval; +} + +#if 0 /*unused*/ +DUK_INTERNAL duk_int_t duk_debug_snprintf(char *str, duk_size_t size, const char *format, ...) { + duk_int_t retval; + va_list ap; + va_start(ap, format); + retval = duk_debug_vsnprintf(str, size, format, ap); + va_end(ap); + return retval; +} +#endif + +/* Formatting function pointers is tricky: there is no standard pointer for + * function pointers and the size of a function pointer may depend on the + * specific pointer type. This helper formats a function pointer based on + * its memory layout to get something useful on most platforms. + */ +DUK_INTERNAL void duk_debug_format_funcptr(char *buf, duk_size_t buf_size, duk_uint8_t *fptr, duk_size_t fptr_size) { + duk_size_t i; + duk_uint8_t *p = (duk_uint8_t *) buf; + duk_uint8_t *p_end = (duk_uint8_t *) (buf + buf_size - 1); + + DUK_ASSERT(buf != NULL); + duk_memzero(buf, buf_size); + + for (i = 0; i < fptr_size; i++) { + duk_int_t left = (duk_int_t) (p_end - p); + duk_uint8_t ch; + if (left <= 0) { + break; + } + + /* Quite approximate but should be useful for little and big endian. */ +#if defined(DUK_USE_INTEGER_BE) + ch = fptr[i]; +#else + ch = fptr[fptr_size - 1 - i]; +#endif + p += DUK_SNPRINTF((char *) p, (duk_size_t) left, "%02lx", (unsigned long) ch); + } +} + +#endif /* DUK_USE_DEBUG */ + +/* automatic undefs */ +#undef DUK__ALLOWED_STANDARD_SPECIFIERS +#undef DUK__COMMA +#undef DUK__DEEP_DEPTH_LIMIT +#undef DUK__LOOP_STACK_DEPTH +#undef DUK__MAX_FORMAT_TAG_LENGTH +#line 1 "duk_debugger.c" +/* + * Duktape debugger + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + +/* + * Assert helpers + */ + +#if defined(DUK_USE_ASSERTIONS) +#define DUK__DBG_TPORT_ENTER() do { \ + DUK_ASSERT(heap->dbg_calling_transport == 0); \ + heap->dbg_calling_transport = 1; \ + } while (0) +#define DUK__DBG_TPORT_EXIT() do { \ + DUK_ASSERT(heap->dbg_calling_transport == 1); \ + heap->dbg_calling_transport = 0; \ + } while (0) +#else +#define DUK__DBG_TPORT_ENTER() do {} while (0) +#define DUK__DBG_TPORT_EXIT() do {} while (0) +#endif + +/* + * Helper structs + */ + +typedef union { + void *p; + duk_uint_t b[1]; + /* Use b[] to access the size of the union, which is strictly not + * correct. Can't use fixed size unless there's feature detection + * for pointer byte size. + */ +} duk__ptr_union; + +/* + * Detach handling + */ + +#define DUK__SET_CONN_BROKEN(thr,reason) do { \ + /* For now shared handler is fine. */ \ + duk__debug_do_detach1((thr)->heap, (reason)); \ + } while (0) + +DUK_LOCAL void duk__debug_do_detach1(duk_heap *heap, duk_int_t reason) { + /* Can be called multiple times with no harm. Mark the transport + * bad (dbg_read_cb == NULL) and clear state except for the detached + * callback and the udata field. The detached callback is delayed + * to the message loop so that it can be called between messages; + * this avoids corner cases related to immediate debugger reattach + * inside the detached callback. + */ + + if (heap->dbg_detaching) { + DUK_D(DUK_DPRINT("debugger already detaching, ignore detach1")); + return; + } + + DUK_D(DUK_DPRINT("debugger transport detaching, marking transport broken")); + + heap->dbg_detaching = 1; /* prevent multiple in-progress detaches */ + + if (heap->dbg_write_cb != NULL) { + duk_hthread *thr; + + thr = heap->heap_thread; + DUK_ASSERT(thr != NULL); + + duk_debug_write_notify(thr, DUK_DBG_CMD_DETACHING); + duk_debug_write_int(thr, reason); + duk_debug_write_eom(thr); + } + + heap->dbg_read_cb = NULL; + heap->dbg_write_cb = NULL; + heap->dbg_peek_cb = NULL; + heap->dbg_read_flush_cb = NULL; + heap->dbg_write_flush_cb = NULL; + heap->dbg_request_cb = NULL; + /* heap->dbg_detached_cb: keep */ + /* heap->dbg_udata: keep */ + /* heap->dbg_processing: keep on purpose to avoid debugger re-entry in detaching state */ + heap->dbg_state_dirty = 0; + heap->dbg_force_restart = 0; + heap->dbg_pause_flags = 0; + heap->dbg_pause_act = NULL; + heap->dbg_pause_startline = 0; + heap->dbg_have_next_byte = 0; + duk_debug_clear_paused(heap); /* XXX: some overlap with field inits above */ + heap->dbg_state_dirty = 0; /* XXX: clear_paused sets dirty; rework? */ + + /* Ensure there are no stale active breakpoint pointers. + * Breakpoint list is currently kept - we could empty it + * here but we'd need to handle refcounts correctly, and + * we'd need a 'thr' reference for that. + * + * XXX: clear breakpoint on either attach or detach? + */ + heap->dbg_breakpoints_active[0] = (duk_breakpoint *) NULL; +} + +DUK_LOCAL void duk__debug_do_detach2(duk_heap *heap) { + duk_debug_detached_function detached_cb; + void *detached_udata; + duk_hthread *thr; + + thr = heap->heap_thread; + if (thr == NULL) { + DUK_ASSERT(heap->dbg_detached_cb == NULL); + return; + } + + /* Safe to call multiple times. */ + + detached_cb = heap->dbg_detached_cb; + detached_udata = heap->dbg_udata; + heap->dbg_detached_cb = NULL; + heap->dbg_udata = NULL; + + if (detached_cb) { + /* Careful here: state must be wiped before the call + * so that we can cleanly handle a re-attach from + * inside the callback. + */ + DUK_D(DUK_DPRINT("detached during message loop, delayed call to detached_cb")); + detached_cb(thr, detached_udata); + } + + heap->dbg_detaching = 0; +} + +DUK_INTERNAL void duk_debug_do_detach(duk_heap *heap) { + duk__debug_do_detach1(heap, 0); + duk__debug_do_detach2(heap); +} + +/* Called on a read/write error: NULL all callbacks except the detached + * callback so that we never accidentally call them after a read/write + * error has been indicated. This is especially important for the transport + * I/O callbacks to fulfill guaranteed callback semantics. + */ +DUK_LOCAL void duk__debug_null_most_callbacks(duk_hthread *thr) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + + heap = thr->heap; + DUK_D(DUK_DPRINT("transport read/write error, NULL all callbacks expected detached")); + heap->dbg_read_cb = NULL; + heap->dbg_write_cb = NULL; /* this is especially critical to avoid another write call in detach1() */ + heap->dbg_peek_cb = NULL; + heap->dbg_read_flush_cb = NULL; + heap->dbg_write_flush_cb = NULL; + heap->dbg_request_cb = NULL; + /* keep heap->dbg_detached_cb */ +} + +/* + * Pause handling + */ + +DUK_LOCAL void duk__debug_set_pause_state(duk_hthread *thr, duk_heap *heap, duk_small_uint_t pause_flags) { + duk_uint_fast32_t line; + + line = duk_debug_curr_line(thr); + if (line == 0) { + /* No line info for current function. */ + duk_small_uint_t updated_flags; + + updated_flags = pause_flags & ~(DUK_PAUSE_FLAG_LINE_CHANGE); + DUK_D(DUK_DPRINT("no line info for current activation, disable line-based pause flags: 0x%08lx -> 0x%08lx", + (long) pause_flags, (long) updated_flags)); + pause_flags = updated_flags; + } + + heap->dbg_pause_flags = pause_flags; + heap->dbg_pause_act = thr->callstack_curr; + heap->dbg_pause_startline = (duk_uint32_t) line; + heap->dbg_state_dirty = 1; + + DUK_D(DUK_DPRINT("set state for automatic pause triggers, flags=0x%08lx, act=%p, startline=%ld", + (long) heap->dbg_pause_flags, (void *) heap->dbg_pause_act, + (long) heap->dbg_pause_startline)); +} + +/* + * Debug connection peek and flush primitives + */ + +DUK_INTERNAL duk_bool_t duk_debug_read_peek(duk_hthread *thr) { + duk_heap *heap; + duk_bool_t ret; + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + if (heap->dbg_read_cb == NULL) { + DUK_D(DUK_DPRINT("attempt to peek in detached state, return zero (= no data)")); + return 0; + } + if (heap->dbg_peek_cb == NULL) { + DUK_DD(DUK_DDPRINT("no peek callback, return zero (= no data)")); + return 0; + } + + DUK__DBG_TPORT_ENTER(); + ret = (duk_bool_t) (heap->dbg_peek_cb(heap->dbg_udata) > 0); + DUK__DBG_TPORT_EXIT(); + return ret; +} + +DUK_INTERNAL void duk_debug_read_flush(duk_hthread *thr) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + if (heap->dbg_read_cb == NULL) { + DUK_D(DUK_DPRINT("attempt to read flush in detached state, ignore")); + return; + } + if (heap->dbg_read_flush_cb == NULL) { + DUK_DD(DUK_DDPRINT("no read flush callback, ignore")); + return; + } + + DUK__DBG_TPORT_ENTER(); + heap->dbg_read_flush_cb(heap->dbg_udata); + DUK__DBG_TPORT_EXIT(); +} + +DUK_INTERNAL void duk_debug_write_flush(duk_hthread *thr) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + if (heap->dbg_read_cb == NULL) { + DUK_D(DUK_DPRINT("attempt to write flush in detached state, ignore")); + return; + } + if (heap->dbg_write_flush_cb == NULL) { + DUK_DD(DUK_DDPRINT("no write flush callback, ignore")); + return; + } + + DUK__DBG_TPORT_ENTER(); + heap->dbg_write_flush_cb(heap->dbg_udata); + DUK__DBG_TPORT_EXIT(); +} + +/* + * Debug connection skip primitives + */ + +/* Skip fully. */ +DUK_INTERNAL void duk_debug_skip_bytes(duk_hthread *thr, duk_size_t length) { + duk_uint8_t dummy[64]; + duk_size_t now; + + DUK_ASSERT(thr != NULL); + + while (length > 0) { + now = (length > sizeof(dummy) ? sizeof(dummy) : length); + duk_debug_read_bytes(thr, dummy, now); + length -= now; + } +} + +DUK_INTERNAL void duk_debug_skip_byte(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + + (void) duk_debug_read_byte(thr); +} + +/* + * Debug connection read primitives + */ + +/* Peek ahead in the stream one byte. */ +DUK_INTERNAL uint8_t duk_debug_peek_byte(duk_hthread *thr) { + /* It is important not to call this if the last byte read was an EOM. + * Reading ahead in this scenario would cause unnecessary blocking if + * another message is not available. + */ + + duk_uint8_t x; + + x = duk_debug_read_byte(thr); + thr->heap->dbg_have_next_byte = 1; + thr->heap->dbg_next_byte = x; + return x; +} + +/* Read fully. */ +DUK_INTERNAL void duk_debug_read_bytes(duk_hthread *thr, duk_uint8_t *data, duk_size_t length) { + duk_heap *heap; + duk_uint8_t *p; + duk_size_t left; + duk_size_t got; + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + DUK_ASSERT(data != NULL); + + if (heap->dbg_read_cb == NULL) { + DUK_D(DUK_DPRINT("attempt to read %ld bytes in detached state, return zero data", (long) length)); + goto fail; + } + + /* NOTE: length may be zero */ + p = data; + if (length >= 1 && heap->dbg_have_next_byte) { + heap->dbg_have_next_byte = 0; + *p++ = heap->dbg_next_byte; + } + for (;;) { + left = (duk_size_t) ((data + length) - p); + if (left == 0) { + break; + } + DUK_ASSERT(heap->dbg_read_cb != NULL); + DUK_ASSERT(left >= 1); +#if defined(DUK_USE_DEBUGGER_TRANSPORT_TORTURE) + left = 1; +#endif + DUK__DBG_TPORT_ENTER(); + got = heap->dbg_read_cb(heap->dbg_udata, (char *) p, left); + DUK__DBG_TPORT_EXIT(); + + if (got == 0 || got > left) { + DUK_D(DUK_DPRINT("connection error during read, return zero data")); + duk__debug_null_most_callbacks(thr); /* avoid calling write callback in detach1() */ + DUK__SET_CONN_BROKEN(thr, 1); + goto fail; + } + p += got; + } + return; + + fail: + duk_memzero((void *) data, (size_t) length); +} + +DUK_INTERNAL duk_uint8_t duk_debug_read_byte(duk_hthread *thr) { + duk_uint8_t x; + + x = 0; /* just in case callback is broken and won't write 'x' */ + duk_debug_read_bytes(thr, &x, 1); + return x; +} + +DUK_LOCAL duk_uint32_t duk__debug_read_uint32_raw(duk_hthread *thr) { + duk_uint8_t buf[4]; + + DUK_ASSERT(thr != NULL); + + duk_debug_read_bytes(thr, buf, 4); + return ((duk_uint32_t) buf[0] << 24) | + ((duk_uint32_t) buf[1] << 16) | + ((duk_uint32_t) buf[2] << 8) | + (duk_uint32_t) buf[3]; +} + +DUK_LOCAL duk_int32_t duk__debug_read_int32_raw(duk_hthread *thr) { + return (duk_int32_t) duk__debug_read_uint32_raw(thr); +} + +DUK_LOCAL duk_uint16_t duk__debug_read_uint16_raw(duk_hthread *thr) { + duk_uint8_t buf[2]; + + DUK_ASSERT(thr != NULL); + + duk_debug_read_bytes(thr, buf, 2); + return ((duk_uint16_t) buf[0] << 8) | + (duk_uint16_t) buf[1]; +} + +DUK_INTERNAL duk_int32_t duk_debug_read_int(duk_hthread *thr) { + duk_small_uint_t x; + duk_small_uint_t t; + + DUK_ASSERT(thr != NULL); + + x = duk_debug_read_byte(thr); + if (x >= 0xc0) { + t = duk_debug_read_byte(thr); + return (duk_int32_t) (((x - 0xc0) << 8) + t); + } else if (x >= 0x80) { + return (duk_int32_t) (x - 0x80); + } else if (x == DUK_DBG_IB_INT4) { + return (duk_int32_t) duk__debug_read_uint32_raw(thr); + } + + DUK_D(DUK_DPRINT("debug connection error: failed to decode int")); + DUK__SET_CONN_BROKEN(thr, 1); + return 0; +} + +DUK_LOCAL duk_hstring *duk__debug_read_hstring_raw(duk_hthread *thr, duk_uint32_t len) { + duk_uint8_t buf[31]; + duk_uint8_t *p; + + if (len <= sizeof(buf)) { + duk_debug_read_bytes(thr, buf, (duk_size_t) len); + duk_push_lstring(thr, (const char *) buf, (duk_size_t) len); + } else { + p = (duk_uint8_t *) duk_push_fixed_buffer(thr, (duk_size_t) len); /* zero for paranoia */ + DUK_ASSERT(p != NULL); + duk_debug_read_bytes(thr, p, (duk_size_t) len); + (void) duk_buffer_to_string(thr, -1); /* Safety relies on debug client, which is OK. */ + } + + return duk_require_hstring(thr, -1); +} + +DUK_INTERNAL duk_hstring *duk_debug_read_hstring(duk_hthread *thr) { + duk_small_uint_t x; + duk_uint32_t len; + + DUK_ASSERT(thr != NULL); + + x = duk_debug_read_byte(thr); + if (x >= 0x60 && x <= 0x7f) { + /* For short strings, use a fixed temp buffer. */ + len = (duk_uint32_t) (x - 0x60); + } else if (x == DUK_DBG_IB_STR2) { + len = (duk_uint32_t) duk__debug_read_uint16_raw(thr); + } else if (x == DUK_DBG_IB_STR4) { + len = (duk_uint32_t) duk__debug_read_uint32_raw(thr); + } else { + goto fail; + } + + return duk__debug_read_hstring_raw(thr, len); + + fail: + DUK_D(DUK_DPRINT("debug connection error: failed to decode int")); + DUK__SET_CONN_BROKEN(thr, 1); + duk_push_hstring_empty(thr); /* always push some string */ + return duk_require_hstring(thr, -1); +} + +DUK_LOCAL duk_hbuffer *duk__debug_read_hbuffer_raw(duk_hthread *thr, duk_uint32_t len) { + duk_uint8_t *p; + + p = (duk_uint8_t *) duk_push_fixed_buffer(thr, (duk_size_t) len); /* zero for paranoia */ + DUK_ASSERT(p != NULL); + duk_debug_read_bytes(thr, p, (duk_size_t) len); + + return duk_require_hbuffer(thr, -1); +} + +DUK_LOCAL void *duk__debug_read_pointer_raw(duk_hthread *thr) { + duk_small_uint_t x; + duk__ptr_union pu; + + DUK_ASSERT(thr != NULL); + + x = duk_debug_read_byte(thr); + if (x != sizeof(pu)) { + goto fail; + } + duk_debug_read_bytes(thr, (duk_uint8_t *) &pu.p, sizeof(pu)); +#if defined(DUK_USE_INTEGER_LE) + duk_byteswap_bytes((duk_uint8_t *) pu.b, sizeof(pu)); +#endif + return (void *) pu.p; + + fail: + DUK_D(DUK_DPRINT("debug connection error: failed to decode pointer")); + DUK__SET_CONN_BROKEN(thr, 1); + return (void *) NULL; +} + +DUK_LOCAL duk_double_t duk__debug_read_double_raw(duk_hthread *thr) { + duk_double_union du; + + DUK_ASSERT(sizeof(du.uc) == 8); + duk_debug_read_bytes(thr, (duk_uint8_t *) du.uc, sizeof(du.uc)); + DUK_DBLUNION_DOUBLE_NTOH(&du); + return du.d; +} + +#if 0 +DUK_INTERNAL duk_heaphdr *duk_debug_read_heapptr(duk_hthread *thr) { + duk_small_uint_t x; + + DUK_ASSERT(thr != NULL); + + x = duk_debug_read_byte(thr); + if (x != DUK_DBG_IB_HEAPPTR) { + goto fail; + } + + return (duk_heaphdr *) duk__debug_read_pointer_raw(thr); + + fail: + DUK_D(DUK_DPRINT("debug connection error: failed to decode heapptr")); + DUK__SET_CONN_BROKEN(thr, 1); + return NULL; +} +#endif + +DUK_INTERNAL duk_heaphdr *duk_debug_read_any_ptr(duk_hthread *thr) { + duk_small_uint_t x; + + DUK_ASSERT(thr != NULL); + + x = duk_debug_read_byte(thr); + switch (x) { + case DUK_DBG_IB_OBJECT: + case DUK_DBG_IB_POINTER: + case DUK_DBG_IB_HEAPPTR: + /* Accept any pointer-like value; for 'object' dvalue, read + * and ignore the class number. + */ + if (x == DUK_DBG_IB_OBJECT) { + duk_debug_skip_byte(thr); + } + break; + default: + goto fail; + } + + return (duk_heaphdr *) duk__debug_read_pointer_raw(thr); + + fail: + DUK_D(DUK_DPRINT("debug connection error: failed to decode any pointer (object, pointer, heapptr)")); + DUK__SET_CONN_BROKEN(thr, 1); + return NULL; +} + +DUK_INTERNAL duk_tval *duk_debug_read_tval(duk_hthread *thr) { + duk_uint8_t x; + duk_uint_t t; + duk_uint32_t len; + + DUK_ASSERT(thr != NULL); + + x = duk_debug_read_byte(thr); + + if (x >= 0xc0) { + t = (duk_uint_t) (x - 0xc0); + t = (t << 8) + duk_debug_read_byte(thr); + duk_push_uint(thr, (duk_uint_t) t); + goto return_ptr; + } + if (x >= 0x80) { + duk_push_uint(thr, (duk_uint_t) (x - 0x80)); + goto return_ptr; + } + if (x >= 0x60) { + len = (duk_uint32_t) (x - 0x60); + duk__debug_read_hstring_raw(thr, len); + goto return_ptr; + } + + switch (x) { + case DUK_DBG_IB_INT4: { + duk_int32_t i = duk__debug_read_int32_raw(thr); + duk_push_i32(thr, i); + break; + } + case DUK_DBG_IB_STR4: { + len = duk__debug_read_uint32_raw(thr); + duk__debug_read_hstring_raw(thr, len); + break; + } + case DUK_DBG_IB_STR2: { + len = duk__debug_read_uint16_raw(thr); + duk__debug_read_hstring_raw(thr, len); + break; + } + case DUK_DBG_IB_BUF4: { + len = duk__debug_read_uint32_raw(thr); + duk__debug_read_hbuffer_raw(thr, len); + break; + } + case DUK_DBG_IB_BUF2: { + len = duk__debug_read_uint16_raw(thr); + duk__debug_read_hbuffer_raw(thr, len); + break; + } + case DUK_DBG_IB_UNDEFINED: { + duk_push_undefined(thr); + break; + } + case DUK_DBG_IB_NULL: { + duk_push_null(thr); + break; + } + case DUK_DBG_IB_TRUE: { + duk_push_true(thr); + break; + } + case DUK_DBG_IB_FALSE: { + duk_push_false(thr); + break; + } + case DUK_DBG_IB_NUMBER: { + duk_double_t d; + d = duk__debug_read_double_raw(thr); + duk_push_number(thr, d); + break; + } + case DUK_DBG_IB_OBJECT: { + duk_heaphdr *h; + duk_debug_skip_byte(thr); + h = (duk_heaphdr *) duk__debug_read_pointer_raw(thr); + duk_push_heapptr(thr, (void *) h); + break; + } + case DUK_DBG_IB_POINTER: { + void *ptr; + ptr = duk__debug_read_pointer_raw(thr); + duk_push_pointer(thr, ptr); + break; + } + case DUK_DBG_IB_LIGHTFUNC: { + /* XXX: Not needed for now, so not implemented. Note that + * function pointers may have different size/layout than + * a void pointer. + */ + DUK_D(DUK_DPRINT("reading lightfunc values unimplemented")); + goto fail; + } + case DUK_DBG_IB_HEAPPTR: { + duk_heaphdr *h; + h = (duk_heaphdr *) duk__debug_read_pointer_raw(thr); + duk_push_heapptr(thr, (void *) h); + break; + } + case DUK_DBG_IB_UNUSED: /* unused: not accepted in inbound messages */ + default: + goto fail; + } + + return_ptr: + return DUK_GET_TVAL_NEGIDX(thr, -1); + + fail: + DUK_D(DUK_DPRINT("debug connection error: failed to decode tval")); + DUK__SET_CONN_BROKEN(thr, 1); + return NULL; +} + +/* + * Debug connection write primitives + */ + +/* Write fully. */ +DUK_INTERNAL void duk_debug_write_bytes(duk_hthread *thr, const duk_uint8_t *data, duk_size_t length) { + duk_heap *heap; + const duk_uint8_t *p; + duk_size_t left; + duk_size_t got; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(length == 0 || data != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + if (heap->dbg_write_cb == NULL) { + DUK_D(DUK_DPRINT("attempt to write %ld bytes in detached state, ignore", (long) length)); + return; + } + if (length == 0) { + /* Avoid doing an actual write callback with length == 0, + * because that's reserved for a write flush. + */ + return; + } + DUK_ASSERT(data != NULL); + + p = data; + for (;;) { + left = (duk_size_t) ((data + length) - p); + if (left == 0) { + break; + } + DUK_ASSERT(heap->dbg_write_cb != NULL); + DUK_ASSERT(left >= 1); +#if defined(DUK_USE_DEBUGGER_TRANSPORT_TORTURE) + left = 1; +#endif + DUK__DBG_TPORT_ENTER(); + got = heap->dbg_write_cb(heap->dbg_udata, (const char *) p, left); + DUK__DBG_TPORT_EXIT(); + + if (got == 0 || got > left) { + duk__debug_null_most_callbacks(thr); /* avoid calling write callback in detach1() */ + DUK_D(DUK_DPRINT("connection error during write")); + DUK__SET_CONN_BROKEN(thr, 1); + return; + } + p += got; + } +} + +DUK_INTERNAL void duk_debug_write_byte(duk_hthread *thr, duk_uint8_t x) { + duk_debug_write_bytes(thr, (const duk_uint8_t *) &x, 1); +} + +DUK_INTERNAL void duk_debug_write_unused(duk_hthread *thr) { + duk_debug_write_byte(thr, DUK_DBG_IB_UNUSED); +} + +DUK_INTERNAL void duk_debug_write_undefined(duk_hthread *thr) { + duk_debug_write_byte(thr, DUK_DBG_IB_UNDEFINED); +} + +#if defined(DUK_USE_DEBUGGER_INSPECT) +DUK_INTERNAL void duk_debug_write_null(duk_hthread *thr) { + duk_debug_write_byte(thr, DUK_DBG_IB_NULL); +} +#endif + +DUK_INTERNAL void duk_debug_write_boolean(duk_hthread *thr, duk_uint_t val) { + duk_debug_write_byte(thr, val ? DUK_DBG_IB_TRUE : DUK_DBG_IB_FALSE); +} + +/* Write signed 32-bit integer. */ +DUK_INTERNAL void duk_debug_write_int(duk_hthread *thr, duk_int32_t x) { + duk_uint8_t buf[5]; + duk_size_t len; + + DUK_ASSERT(thr != NULL); + + if (x >= 0 && x <= 0x3fL) { + buf[0] = (duk_uint8_t) (0x80 + x); + len = 1; + } else if (x >= 0 && x <= 0x3fffL) { + buf[0] = (duk_uint8_t) (0xc0 + (x >> 8)); + buf[1] = (duk_uint8_t) (x & 0xff); + len = 2; + } else { + /* Signed integers always map to 4 bytes now. */ + buf[0] = (duk_uint8_t) DUK_DBG_IB_INT4; + buf[1] = (duk_uint8_t) ((x >> 24) & 0xff); + buf[2] = (duk_uint8_t) ((x >> 16) & 0xff); + buf[3] = (duk_uint8_t) ((x >> 8) & 0xff); + buf[4] = (duk_uint8_t) (x & 0xff); + len = 5; + } + duk_debug_write_bytes(thr, buf, len); +} + +/* Write unsigned 32-bit integer. */ +DUK_INTERNAL void duk_debug_write_uint(duk_hthread *thr, duk_uint32_t x) { + /* The debugger protocol doesn't support a plain integer encoding for + * the full 32-bit unsigned range (only 32-bit signed). For now, + * unsigned 32-bit values simply written as signed ones. This is not + * a concrete issue except for 32-bit heaphdr fields. Proper solutions + * would be to (a) write such integers as IEEE doubles or (b) add an + * unsigned 32-bit dvalue. + */ + if (x >= 0x80000000UL) { + DUK_D(DUK_DPRINT("writing unsigned integer 0x%08lx as signed integer", + (long) x)); + } + duk_debug_write_int(thr, (duk_int32_t) x); +} + +DUK_INTERNAL void duk_debug_write_strbuf(duk_hthread *thr, const char *data, duk_size_t length, duk_uint8_t marker_base) { + duk_uint8_t buf[5]; + duk_size_t buflen; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(length == 0 || data != NULL); + + if (length <= 0x1fUL && marker_base == DUK_DBG_IB_STR4) { + /* For strings, special form for short lengths. */ + buf[0] = (duk_uint8_t) (0x60 + length); + buflen = 1; + } else if (length <= 0xffffUL) { + buf[0] = (duk_uint8_t) (marker_base + 1); + buf[1] = (duk_uint8_t) (length >> 8); + buf[2] = (duk_uint8_t) (length & 0xff); + buflen = 3; + } else { + buf[0] = (duk_uint8_t) marker_base; + buf[1] = (duk_uint8_t) (length >> 24); + buf[2] = (duk_uint8_t) ((length >> 16) & 0xff); + buf[3] = (duk_uint8_t) ((length >> 8) & 0xff); + buf[4] = (duk_uint8_t) (length & 0xff); + buflen = 5; + } + + duk_debug_write_bytes(thr, (const duk_uint8_t *) buf, buflen); + duk_debug_write_bytes(thr, (const duk_uint8_t *) data, length); +} + +DUK_INTERNAL void duk_debug_write_string(duk_hthread *thr, const char *data, duk_size_t length) { + duk_debug_write_strbuf(thr, data, length, DUK_DBG_IB_STR4); +} + +DUK_INTERNAL void duk_debug_write_cstring(duk_hthread *thr, const char *data) { + DUK_ASSERT(thr != NULL); + + duk_debug_write_string(thr, + data, + data ? DUK_STRLEN(data) : 0); +} + +DUK_INTERNAL void duk_debug_write_hstring(duk_hthread *thr, duk_hstring *h) { + DUK_ASSERT(thr != NULL); + + /* XXX: differentiate null pointer from empty string? */ + duk_debug_write_string(thr, + (h != NULL ? (const char *) DUK_HSTRING_GET_DATA(h) : NULL), + (h != NULL ? (duk_size_t) DUK_HSTRING_GET_BYTELEN(h) : 0)); +} + +DUK_LOCAL void duk__debug_write_hstring_safe_top(duk_hthread *thr) { + duk_debug_write_hstring(thr, duk_safe_to_hstring(thr, -1)); +} + +DUK_INTERNAL void duk_debug_write_buffer(duk_hthread *thr, const char *data, duk_size_t length) { + duk_debug_write_strbuf(thr, data, length, DUK_DBG_IB_BUF4); +} + +DUK_INTERNAL void duk_debug_write_hbuffer(duk_hthread *thr, duk_hbuffer *h) { + DUK_ASSERT(thr != NULL); + + duk_debug_write_buffer(thr, + (h != NULL ? (const char *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h) : NULL), + (h != NULL ? (duk_size_t) DUK_HBUFFER_GET_SIZE(h) : 0)); +} + +DUK_LOCAL void duk__debug_write_pointer_raw(duk_hthread *thr, void *ptr, duk_uint8_t ibyte) { + duk_uint8_t buf[2]; + duk__ptr_union pu; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(sizeof(ptr) >= 1 && sizeof(ptr) <= 16); + /* ptr may be NULL */ + + buf[0] = ibyte; + buf[1] = sizeof(pu); + duk_debug_write_bytes(thr, buf, 2); + pu.p = (void *) ptr; +#if defined(DUK_USE_INTEGER_LE) + duk_byteswap_bytes((duk_uint8_t *) pu.b, sizeof(pu)); +#endif + duk_debug_write_bytes(thr, (const duk_uint8_t *) &pu.p, (duk_size_t) sizeof(pu)); +} + +DUK_INTERNAL void duk_debug_write_pointer(duk_hthread *thr, void *ptr) { + duk__debug_write_pointer_raw(thr, ptr, DUK_DBG_IB_POINTER); +} + +#if defined(DUK_USE_DEBUGGER_DUMPHEAP) || defined(DUK_USE_DEBUGGER_INSPECT) +DUK_INTERNAL void duk_debug_write_heapptr(duk_hthread *thr, duk_heaphdr *h) { + duk__debug_write_pointer_raw(thr, (void *) h, DUK_DBG_IB_HEAPPTR); +} +#endif /* DUK_USE_DEBUGGER_DUMPHEAP || DUK_USE_DEBUGGER_INSPECT */ + +DUK_INTERNAL void duk_debug_write_hobject(duk_hthread *thr, duk_hobject *obj) { + duk_uint8_t buf[3]; + duk__ptr_union pu; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(sizeof(obj) >= 1 && sizeof(obj) <= 16); + DUK_ASSERT(obj != NULL); + + buf[0] = DUK_DBG_IB_OBJECT; + buf[1] = (duk_uint8_t) DUK_HOBJECT_GET_CLASS_NUMBER(obj); + buf[2] = sizeof(pu); + duk_debug_write_bytes(thr, buf, 3); + pu.p = (void *) obj; +#if defined(DUK_USE_INTEGER_LE) + duk_byteswap_bytes((duk_uint8_t *) pu.b, sizeof(pu)); +#endif + duk_debug_write_bytes(thr, (const duk_uint8_t *) &pu.p, (duk_size_t) sizeof(pu)); +} + +DUK_INTERNAL void duk_debug_write_tval(duk_hthread *thr, duk_tval *tv) { + duk_c_function lf_func; + duk_small_uint_t lf_flags; + duk_uint8_t buf[4]; + duk_double_union du1; + duk_double_union du2; + duk_int32_t i32; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: + duk_debug_write_byte(thr, DUK_DBG_IB_UNDEFINED); + break; + case DUK_TAG_UNUSED: + duk_debug_write_byte(thr, DUK_DBG_IB_UNUSED); + break; + case DUK_TAG_NULL: + duk_debug_write_byte(thr, DUK_DBG_IB_NULL); + break; + case DUK_TAG_BOOLEAN: + DUK_ASSERT(DUK_TVAL_GET_BOOLEAN(tv) == 0 || + DUK_TVAL_GET_BOOLEAN(tv) == 1); + duk_debug_write_boolean(thr, DUK_TVAL_GET_BOOLEAN(tv)); + break; + case DUK_TAG_POINTER: + duk_debug_write_pointer(thr, (void *) DUK_TVAL_GET_POINTER(tv)); + break; + case DUK_TAG_LIGHTFUNC: + DUK_TVAL_GET_LIGHTFUNC(tv, lf_func, lf_flags); + buf[0] = DUK_DBG_IB_LIGHTFUNC; + buf[1] = (duk_uint8_t) (lf_flags >> 8); + buf[2] = (duk_uint8_t) (lf_flags & 0xff); + buf[3] = sizeof(lf_func); + duk_debug_write_bytes(thr, buf, 4); + duk_debug_write_bytes(thr, (const duk_uint8_t *) &lf_func, sizeof(lf_func)); + break; + case DUK_TAG_STRING: + duk_debug_write_hstring(thr, DUK_TVAL_GET_STRING(tv)); + break; + case DUK_TAG_OBJECT: + duk_debug_write_hobject(thr, DUK_TVAL_GET_OBJECT(tv)); + break; + case DUK_TAG_BUFFER: + duk_debug_write_hbuffer(thr, DUK_TVAL_GET_BUFFER(tv)); + break; +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: + /* Numbers are normalized to big (network) endian. We can + * (but are not required) to use integer dvalues when there's + * no loss of precision. + * + * XXX: share check with other code; this check is slow but + * reliable and doesn't require careful exponent/mantissa + * mask tricks as in the fastint downgrade code. + */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + du1.d = DUK_TVAL_GET_NUMBER(tv); + i32 = (duk_int32_t) du1.d; + du2.d = (duk_double_t) i32; + + DUK_DD(DUK_DDPRINT("i32=%ld du1=%02x%02x%02x%02x%02x%02x%02x%02x " + "du2=%02x%02x%02x%02x%02x%02x%02x%02x", + (long) i32, + (unsigned int) du1.uc[0], (unsigned int) du1.uc[1], + (unsigned int) du1.uc[2], (unsigned int) du1.uc[3], + (unsigned int) du1.uc[4], (unsigned int) du1.uc[5], + (unsigned int) du1.uc[6], (unsigned int) du1.uc[7], + (unsigned int) du2.uc[0], (unsigned int) du2.uc[1], + (unsigned int) du2.uc[2], (unsigned int) du2.uc[3], + (unsigned int) du2.uc[4], (unsigned int) du2.uc[5], + (unsigned int) du2.uc[6], (unsigned int) du2.uc[7])); + + if (duk_memcmp((const void *) du1.uc, (const void *) du2.uc, sizeof(du1.uc)) == 0) { + duk_debug_write_int(thr, i32); + } else { + DUK_DBLUNION_DOUBLE_HTON(&du1); + duk_debug_write_byte(thr, DUK_DBG_IB_NUMBER); + duk_debug_write_bytes(thr, (const duk_uint8_t *) du1.uc, sizeof(du1.uc)); + } + } +} + +#if defined(DUK_USE_DEBUGGER_DUMPHEAP) +/* Variant for writing duk_tvals so that any heap allocated values are + * written out as tagged heap pointers. + */ +DUK_LOCAL void duk__debug_write_tval_heapptr(duk_hthread *thr, duk_tval *tv) { + if (DUK_TVAL_IS_HEAP_ALLOCATED(tv)) { + duk_heaphdr *h = DUK_TVAL_GET_HEAPHDR(tv); + duk_debug_write_heapptr(thr, h); + } else { + duk_debug_write_tval(thr, tv); + } +} +#endif /* DUK_USE_DEBUGGER_DUMPHEAP */ + +/* + * Debug connection message write helpers + */ + +#if 0 /* unused */ +DUK_INTERNAL void duk_debug_write_request(duk_hthread *thr, duk_small_uint_t command) { + duk_debug_write_byte(thr, DUK_DBG_IB_REQUEST); + duk_debug_write_int(thr, command); +} +#endif + +DUK_INTERNAL void duk_debug_write_reply(duk_hthread *thr) { + duk_debug_write_byte(thr, DUK_DBG_IB_REPLY); +} + +DUK_INTERNAL void duk_debug_write_error_eom(duk_hthread *thr, duk_small_uint_t err_code, const char *msg) { + /* Allow NULL 'msg' */ + duk_debug_write_byte(thr, DUK_DBG_IB_ERROR); + duk_debug_write_int(thr, (duk_int32_t) err_code); + duk_debug_write_cstring(thr, msg); + duk_debug_write_eom(thr); +} + +DUK_INTERNAL void duk_debug_write_notify(duk_hthread *thr, duk_small_uint_t command) { + duk_debug_write_byte(thr, DUK_DBG_IB_NOTIFY); + duk_debug_write_int(thr, (duk_int32_t) command); +} + +DUK_INTERNAL void duk_debug_write_eom(duk_hthread *thr) { + duk_debug_write_byte(thr, DUK_DBG_IB_EOM); + + /* As an initial implementation, write flush after every EOM (and the + * version identifier). A better implementation would flush only when + * Duktape is finished processing messages so that a flush only happens + * after all outbound messages are finished on that occasion. + */ + duk_debug_write_flush(thr); +} + +/* + * Status message and helpers + */ + +DUK_INTERNAL duk_uint_fast32_t duk_debug_curr_line(duk_hthread *thr) { + duk_activation *act; + duk_uint_fast32_t line; + duk_uint_fast32_t pc; + + act = thr->callstack_curr; + if (act == NULL) { + return 0; + } + + /* We're conceptually between two opcodes; act->pc indicates the next + * instruction to be executed. This is usually the correct pc/line to + * indicate in Status. (For the 'debugger' statement this now reports + * the pc/line after the debugger statement because the debugger opcode + * has already been executed.) + */ + + pc = duk_hthread_get_act_curr_pc(thr, act); + + /* XXX: this should be optimized to be a raw query and avoid valstack + * operations if possible. + */ + duk_push_tval(thr, &act->tv_func); + line = duk_hobject_pc2line_query(thr, -1, pc); + duk_pop(thr); + return line; +} + +DUK_INTERNAL void duk_debug_send_status(duk_hthread *thr) { + duk_activation *act; + + duk_debug_write_notify(thr, DUK_DBG_CMD_STATUS); + duk_debug_write_int(thr, (DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) ? 1 : 0)); + + act = thr->callstack_curr; + if (act == NULL) { + duk_debug_write_undefined(thr); + duk_debug_write_undefined(thr); + duk_debug_write_int(thr, 0); + duk_debug_write_int(thr, 0); + } else { + duk_push_tval(thr, &act->tv_func); + duk_get_prop_literal(thr, -1, "fileName"); + duk__debug_write_hstring_safe_top(thr); + duk_get_prop_literal(thr, -2, "name"); + duk__debug_write_hstring_safe_top(thr); + duk_pop_3(thr); + /* Report next pc/line to be executed. */ + duk_debug_write_uint(thr, (duk_uint32_t) duk_debug_curr_line(thr)); + duk_debug_write_uint(thr, (duk_uint32_t) duk_hthread_get_act_curr_pc(thr, act)); + } + + duk_debug_write_eom(thr); +} + +#if defined(DUK_USE_DEBUGGER_THROW_NOTIFY) +DUK_INTERNAL void duk_debug_send_throw(duk_hthread *thr, duk_bool_t fatal) { + /* + * NFY <int: 5> <int: fatal> <str: msg> <str: filename> <int: linenumber> EOM + */ + + duk_activation *act; + duk_uint32_t pc; + + DUK_ASSERT(thr->valstack_top > thr->valstack); /* At least: ... [err] */ + + duk_debug_write_notify(thr, DUK_DBG_CMD_THROW); + duk_debug_write_int(thr, (duk_int32_t) fatal); + + /* Report thrown value to client coerced to string */ + duk_dup_top(thr); + duk__debug_write_hstring_safe_top(thr); + duk_pop(thr); + + if (duk_is_error(thr, -1)) { + /* Error instance, use augmented error data directly */ + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_FILE_NAME); + duk__debug_write_hstring_safe_top(thr); + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_LINE_NUMBER); + duk_debug_write_uint(thr, duk_get_uint(thr, -1)); + duk_pop_2(thr); + } else { + /* For anything other than an Error instance, we calculate the + * error location directly from the current activation if one + * exists. + */ + act = thr->callstack_curr; + if (act != NULL) { + duk_push_tval(thr, &act->tv_func); + duk_get_prop_literal(thr, -1, "fileName"); + duk__debug_write_hstring_safe_top(thr); + pc = (duk_uint32_t) duk_hthread_get_act_prev_pc(thr, act); + duk_debug_write_uint(thr, (duk_uint32_t) duk_hobject_pc2line_query(thr, -2, pc)); + duk_pop_2(thr); + } else { + /* Can happen if duk_throw() is called on an empty + * callstack. + */ + duk_debug_write_cstring(thr, ""); + duk_debug_write_uint(thr, 0); + } + } + + duk_debug_write_eom(thr); +} +#endif /* DUK_USE_DEBUGGER_THROW_NOTIFY */ + +/* + * Debug message processing + */ + +/* Skip dvalue. */ +DUK_LOCAL duk_bool_t duk__debug_skip_dvalue(duk_hthread *thr) { + duk_uint8_t x; + duk_uint32_t len; + + x = duk_debug_read_byte(thr); + + if (x >= 0xc0) { + duk_debug_skip_byte(thr); + return 0; + } + if (x >= 0x80) { + return 0; + } + if (x >= 0x60) { + duk_debug_skip_bytes(thr, (duk_size_t) (x - 0x60)); + return 0; + } + switch(x) { + case DUK_DBG_IB_EOM: + return 1; /* Return 1: got EOM */ + case DUK_DBG_IB_REQUEST: + case DUK_DBG_IB_REPLY: + case DUK_DBG_IB_ERROR: + case DUK_DBG_IB_NOTIFY: + break; + case DUK_DBG_IB_INT4: + (void) duk__debug_read_uint32_raw(thr); + break; + case DUK_DBG_IB_STR4: + case DUK_DBG_IB_BUF4: + len = duk__debug_read_uint32_raw(thr); + duk_debug_skip_bytes(thr, len); + break; + case DUK_DBG_IB_STR2: + case DUK_DBG_IB_BUF2: + len = duk__debug_read_uint16_raw(thr); + duk_debug_skip_bytes(thr, len); + break; + case DUK_DBG_IB_UNUSED: + case DUK_DBG_IB_UNDEFINED: + case DUK_DBG_IB_NULL: + case DUK_DBG_IB_TRUE: + case DUK_DBG_IB_FALSE: + break; + case DUK_DBG_IB_NUMBER: + duk_debug_skip_bytes(thr, 8); + break; + case DUK_DBG_IB_OBJECT: + duk_debug_skip_byte(thr); + len = duk_debug_read_byte(thr); + duk_debug_skip_bytes(thr, len); + break; + case DUK_DBG_IB_POINTER: + case DUK_DBG_IB_HEAPPTR: + len = duk_debug_read_byte(thr); + duk_debug_skip_bytes(thr, len); + break; + case DUK_DBG_IB_LIGHTFUNC: + duk_debug_skip_bytes(thr, 2); + len = duk_debug_read_byte(thr); + duk_debug_skip_bytes(thr, len); + break; + default: + goto fail; + } + + return 0; + + fail: + DUK__SET_CONN_BROKEN(thr, 1); + return 1; /* Pretend like we got EOM */ +} + +/* Skip dvalues to EOM. */ +DUK_LOCAL void duk__debug_skip_to_eom(duk_hthread *thr) { + for (;;) { + if (duk__debug_skip_dvalue(thr)) { + break; + } + } +} + +/* Read and validate a call stack index. If index is invalid, write out an + * error message and return zero. + */ +DUK_LOCAL duk_int32_t duk__debug_read_validate_csindex(duk_hthread *thr) { + duk_int32_t level; + level = duk_debug_read_int(thr); + if (level >= 0 || -level > (duk_int32_t) thr->callstack_top) { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid callstack index"); + return 0; /* zero indicates failure */ + } + return level; +} + +/* Read a call stack index and lookup the corresponding duk_activation. + * If index is invalid, write out an error message and return NULL. + */ +DUK_LOCAL duk_activation *duk__debug_read_level_get_activation(duk_hthread *thr) { + duk_activation *act; + duk_int32_t level; + + level = duk_debug_read_int(thr); + act = duk_hthread_get_activation_for_level(thr, level); + if (act == NULL) { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid callstack index"); + } + return act; +} + +/* + * Simple commands + */ + +DUK_LOCAL void duk__debug_handle_basic_info(duk_hthread *thr, duk_heap *heap) { + DUK_UNREF(heap); + DUK_D(DUK_DPRINT("debug command Version")); + + duk_debug_write_reply(thr); + duk_debug_write_int(thr, DUK_VERSION); + duk_debug_write_cstring(thr, DUK_GIT_DESCRIBE); + duk_debug_write_cstring(thr, DUK_USE_TARGET_INFO); +#if defined(DUK_USE_DOUBLE_LE) + duk_debug_write_int(thr, 1); +#elif defined(DUK_USE_DOUBLE_ME) + duk_debug_write_int(thr, 2); +#elif defined(DUK_USE_DOUBLE_BE) + duk_debug_write_int(thr, 3); +#else + duk_debug_write_int(thr, 0); +#endif + duk_debug_write_int(thr, (duk_int_t) sizeof(void *)); + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_trigger_status(duk_hthread *thr, duk_heap *heap) { + DUK_UNREF(heap); + DUK_D(DUK_DPRINT("debug command TriggerStatus")); + + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); + heap->dbg_state_dirty = 1; +} + +DUK_LOCAL void duk__debug_handle_pause(duk_hthread *thr, duk_heap *heap) { + DUK_D(DUK_DPRINT("debug command Pause")); + duk_debug_set_paused(heap); + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_resume(duk_hthread *thr, duk_heap *heap) { + duk_small_uint_t pause_flags; + + DUK_D(DUK_DPRINT("debug command Resume")); + + duk_debug_clear_paused(heap); + + pause_flags = 0; +#if 0 /* manual testing */ + pause_flags |= DUK_PAUSE_FLAG_ONE_OPCODE; + pause_flags |= DUK_PAUSE_FLAG_CAUGHT_ERROR; + pause_flags |= DUK_PAUSE_FLAG_UNCAUGHT_ERROR; +#endif +#if defined(DUK_USE_DEBUGGER_PAUSE_UNCAUGHT) + pause_flags |= DUK_PAUSE_FLAG_UNCAUGHT_ERROR; +#endif + + duk__debug_set_pause_state(thr, heap, pause_flags); + + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_step(duk_hthread *thr, duk_heap *heap, duk_int32_t cmd) { + duk_small_uint_t pause_flags; + + DUK_D(DUK_DPRINT("debug command StepInto/StepOver/StepOut: %d", (int) cmd)); + + if (cmd == DUK_DBG_CMD_STEPINTO) { + pause_flags = DUK_PAUSE_FLAG_LINE_CHANGE | + DUK_PAUSE_FLAG_FUNC_ENTRY | + DUK_PAUSE_FLAG_FUNC_EXIT; + } else if (cmd == DUK_DBG_CMD_STEPOVER) { + pause_flags = DUK_PAUSE_FLAG_LINE_CHANGE | + DUK_PAUSE_FLAG_FUNC_EXIT; + } else { + DUK_ASSERT(cmd == DUK_DBG_CMD_STEPOUT); + pause_flags = DUK_PAUSE_FLAG_FUNC_EXIT; + } +#if defined(DUK_USE_DEBUGGER_PAUSE_UNCAUGHT) + pause_flags |= DUK_PAUSE_FLAG_UNCAUGHT_ERROR; +#endif + + /* If current activation doesn't have line information, line-based + * pause flags are automatically disabled. As a result, e.g. + * StepInto will then pause on (native) function entry or exit. + */ + duk_debug_clear_paused(heap); + duk__debug_set_pause_state(thr, heap, pause_flags); + + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_list_break(duk_hthread *thr, duk_heap *heap) { + duk_small_int_t i; + + DUK_D(DUK_DPRINT("debug command ListBreak")); + duk_debug_write_reply(thr); + for (i = 0; i < (duk_small_int_t) heap->dbg_breakpoint_count; i++) { + duk_debug_write_hstring(thr, heap->dbg_breakpoints[i].filename); + duk_debug_write_uint(thr, (duk_uint32_t) heap->dbg_breakpoints[i].line); + } + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_add_break(duk_hthread *thr, duk_heap *heap) { + duk_hstring *filename; + duk_uint32_t linenumber; + duk_small_int_t idx; + + DUK_UNREF(heap); + + filename = duk_debug_read_hstring(thr); + linenumber = (duk_uint32_t) duk_debug_read_int(thr); + DUK_D(DUK_DPRINT("debug command AddBreak: %!O:%ld", (duk_hobject *) filename, (long) linenumber)); + idx = duk_debug_add_breakpoint(thr, filename, linenumber); + if (idx >= 0) { + duk_debug_write_reply(thr); + duk_debug_write_int(thr, (duk_int32_t) idx); + duk_debug_write_eom(thr); + } else { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_TOOMANY, "no space for breakpoint"); + } +} + +DUK_LOCAL void duk__debug_handle_del_break(duk_hthread *thr, duk_heap *heap) { + duk_small_uint_t idx; + + DUK_UNREF(heap); + + DUK_D(DUK_DPRINT("debug command DelBreak")); + idx = (duk_small_uint_t) duk_debug_read_int(thr); + if (duk_debug_remove_breakpoint(thr, idx)) { + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); + } else { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid breakpoint index"); + } +} + +DUK_LOCAL void duk__debug_handle_get_var(duk_hthread *thr, duk_heap *heap) { + duk_activation *act; + duk_hstring *str; + duk_bool_t rc; + + DUK_UNREF(heap); + DUK_D(DUK_DPRINT("debug command GetVar")); + + act = duk__debug_read_level_get_activation(thr); + if (act == NULL) { + return; + } + str = duk_debug_read_hstring(thr); /* push to stack */ + DUK_ASSERT(str != NULL); + + rc = duk_js_getvar_activation(thr, act, str, 0); + + duk_debug_write_reply(thr); + if (rc) { + duk_debug_write_int(thr, 1); + DUK_ASSERT(duk_get_tval(thr, -2) != NULL); + duk_debug_write_tval(thr, duk_get_tval(thr, -2)); + } else { + duk_debug_write_int(thr, 0); + duk_debug_write_unused(thr); + } + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_put_var(duk_hthread *thr, duk_heap *heap) { + duk_activation *act; + duk_hstring *str; + duk_tval *tv; + + DUK_UNREF(heap); + DUK_D(DUK_DPRINT("debug command PutVar")); + + act = duk__debug_read_level_get_activation(thr); + if (act == NULL) { + return; + } + str = duk_debug_read_hstring(thr); /* push to stack */ + DUK_ASSERT(str != NULL); + tv = duk_debug_read_tval(thr); + if (tv == NULL) { + /* detached */ + return; + } + + duk_js_putvar_activation(thr, act, str, tv, 0); + + /* XXX: Current putvar implementation doesn't have a success flag, + * add one and send to debug client? + */ + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_get_call_stack(duk_hthread *thr, duk_heap *heap) { + duk_hthread *curr_thr = thr; + duk_activation *curr_act; + duk_uint_fast32_t pc; + duk_uint_fast32_t line; + + DUK_ASSERT(thr != NULL); + DUK_UNREF(heap); + + duk_debug_write_reply(thr); + while (curr_thr != NULL) { + for (curr_act = curr_thr->callstack_curr; curr_act != NULL; curr_act = curr_act->parent) { + /* PC/line semantics here are: + * - For callstack top we're conceptually between two + * opcodes and current PC indicates next line to + * execute, so report that (matches Status). + * - For other activations we're conceptually still + * executing the instruction at PC-1, so report that + * (matches error stacktrace behavior). + * - See: https://github.com/svaarala/duktape/issues/281 + */ + + /* XXX: optimize to use direct reads, i.e. avoid + * value stack operations. + */ + duk_push_tval(thr, &curr_act->tv_func); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_FILE_NAME); + duk__debug_write_hstring_safe_top(thr); + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_NAME); + duk__debug_write_hstring_safe_top(thr); + pc = duk_hthread_get_act_curr_pc(thr, curr_act); + if (curr_act != curr_thr->callstack_curr && pc > 0) { + pc--; + } + line = duk_hobject_pc2line_query(thr, -3, pc); + duk_debug_write_uint(thr, (duk_uint32_t) line); + duk_debug_write_uint(thr, (duk_uint32_t) pc); + duk_pop_3(thr); + } + curr_thr = curr_thr->resumer; + } + /* SCANBUILD: warning about 'thr' potentially being NULL here, + * warning is incorrect because thr != NULL always here. + */ + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_get_locals(duk_hthread *thr, duk_heap *heap) { + duk_activation *act; + duk_hstring *varname; + + DUK_UNREF(heap); + + act = duk__debug_read_level_get_activation(thr); + if (act == NULL) { + return; + } + + duk_debug_write_reply(thr); + + /* XXX: several nice-to-have improvements here: + * - Use direct reads avoiding value stack operations + * - Avoid triggering getters, indicate getter values to debug client + * - If side effects are possible, add error catching + */ + + duk_push_tval(thr, &act->tv_func); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_VARMAP); + if (duk_is_object(thr, -1)) { + duk_enum(thr, -1, 0 /*enum_flags*/); + while (duk_next(thr, -1 /*enum_index*/, 0 /*get_value*/)) { + varname = duk_known_hstring(thr, -1); + + duk_js_getvar_activation(thr, act, varname, 0 /*throw_flag*/); + /* [ ... func varmap enum key value this ] */ + duk_debug_write_hstring(thr, duk_get_hstring(thr, -3)); + duk_debug_write_tval(thr, duk_get_tval(thr, -2)); + duk_pop_3(thr); /* -> [ ... func varmap enum ] */ + } + } else { + DUK_D(DUK_DPRINT("varmap is not an object in GetLocals, ignore")); + } + + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_eval(duk_hthread *thr, duk_heap *heap) { + duk_small_uint_t call_flags; + duk_int_t call_ret; + duk_small_int_t eval_err; + duk_bool_t direct_eval; + duk_int32_t level; + duk_idx_t idx_func; + + DUK_UNREF(heap); + + DUK_D(DUK_DPRINT("debug command Eval")); + + /* The eval code is executed within the lexical environment of a specified + * activation. For now, use global object eval() function, with the eval + * considered a 'direct call to eval'. + * + * Callstack index for debug commands only affects scope -- the callstack + * as seen by, e.g. Duktape.act() will be the same regardless. + */ + + /* nargs == 2 so we can pass a callstack index to eval(). */ + idx_func = duk_get_top(thr); + duk_push_c_function(thr, duk_bi_global_object_eval, 2 /*nargs*/); + duk_push_undefined(thr); /* 'this' binding shouldn't matter here */ + + /* Read callstack index, if non-null. */ + if (duk_debug_peek_byte(thr) == DUK_DBG_IB_NULL) { + direct_eval = 0; + level = -1; /* Not needed, but silences warning. */ + (void) duk_debug_read_byte(thr); + } else { + direct_eval = 1; + level = duk__debug_read_validate_csindex(thr); + if (level == 0) { + return; + } + } + + DUK_ASSERT(!direct_eval || + (level < 0 && -level <= (duk_int32_t) thr->callstack_top)); + + (void) duk_debug_read_hstring(thr); + if (direct_eval) { + duk_push_int(thr, level - 1); /* compensate for eval() call */ + } + + /* [ ... eval "eval" eval_input level? ] */ + + call_flags = 0; + if (direct_eval) { + duk_activation *act; + duk_hobject *fun; + + act = duk_hthread_get_activation_for_level(thr, level); + if (act != NULL) { + fun = DUK_ACT_GET_FUNC(act); + if (fun != NULL && DUK_HOBJECT_IS_COMPFUNC(fun)) { + /* Direct eval requires that there's a current + * activation and it is an ECMAScript function. + * When Eval is executed from e.g. cooperate API + * call we'll need to do an indirect eval instead. + */ + call_flags |= DUK_CALL_FLAG_DIRECT_EVAL; + } + } + } + + call_ret = duk_pcall_method_flags(thr, duk_get_top(thr) - (idx_func + 2), call_flags); + + if (call_ret == DUK_EXEC_SUCCESS) { + eval_err = 0; + /* Use result value as is. */ + } else { + /* For errors a string coerced result is most informative + * right now, as the debug client doesn't have the capability + * to traverse the error object. + */ + eval_err = 1; + duk_safe_to_string(thr, -1); + } + + /* [ ... result ] */ + + duk_debug_write_reply(thr); + duk_debug_write_int(thr, (duk_int32_t) eval_err); + DUK_ASSERT(duk_get_tval(thr, -1) != NULL); + duk_debug_write_tval(thr, duk_get_tval(thr, -1)); + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_detach(duk_hthread *thr, duk_heap *heap) { + DUK_UNREF(heap); + DUK_D(DUK_DPRINT("debug command Detach")); + + duk_debug_write_reply(thr); + duk_debug_write_eom(thr); + + DUK_D(DUK_DPRINT("debug connection detached, mark broken")); + DUK__SET_CONN_BROKEN(thr, 0); /* not an error */ +} + +DUK_LOCAL void duk__debug_handle_apprequest(duk_hthread *thr, duk_heap *heap) { + duk_idx_t old_top; + + DUK_D(DUK_DPRINT("debug command AppRequest")); + + old_top = duk_get_top(thr); /* save stack top */ + + if (heap->dbg_request_cb != NULL) { + duk_idx_t nrets; + duk_idx_t nvalues = 0; + duk_idx_t top, idx; + + /* Read tvals from the message and push them onto the valstack, + * then call the request callback to process the request. + */ + while (duk_debug_peek_byte(thr) != DUK_DBG_IB_EOM) { + duk_tval *tv; + if (!duk_check_stack(thr, 1)) { + DUK_D(DUK_DPRINT("failed to allocate space for request dvalue(s)")); + goto fail; + } + tv = duk_debug_read_tval(thr); /* push to stack */ + if (tv == NULL) { + /* detached */ + return; + } + nvalues++; + } + DUK_ASSERT(duk_get_top(thr) == old_top + nvalues); + + /* Request callback should push values for reply to client onto valstack */ + DUK_D(DUK_DPRINT("calling into AppRequest request_cb with nvalues=%ld, old_top=%ld, top=%ld", + (long) nvalues, (long) old_top, (long) duk_get_top(thr))); + nrets = heap->dbg_request_cb(thr, heap->dbg_udata, nvalues); + DUK_D(DUK_DPRINT("returned from AppRequest request_cb; nvalues=%ld -> nrets=%ld, old_top=%ld, top=%ld", + (long) nvalues, (long) nrets, (long) old_top, (long) duk_get_top(thr))); + if (nrets >= 0) { + DUK_ASSERT(duk_get_top(thr) >= old_top + nrets); + if (duk_get_top(thr) < old_top + nrets) { + DUK_D(DUK_DPRINT("AppRequest callback doesn't match value stack configuration, " + "top=%ld < old_top=%ld + nrets=%ld; " + "this might mean it's unsafe to continue!", + (long) duk_get_top(thr), (long) old_top, (long) nrets)); + goto fail; + } + + /* Reply with tvals pushed by request callback */ + duk_debug_write_byte(thr, DUK_DBG_IB_REPLY); + top = duk_get_top(thr); + for (idx = top - nrets; idx < top; idx++) { + duk_debug_write_tval(thr, DUK_GET_TVAL_POSIDX(thr, idx)); + } + duk_debug_write_eom(thr); + } else { + DUK_ASSERT(duk_get_top(thr) >= old_top + 1); + if (duk_get_top(thr) < old_top + 1) { + DUK_D(DUK_DPRINT("request callback return value doesn't match value stack configuration")); + goto fail; + } + duk_debug_write_error_eom(thr, DUK_DBG_ERR_APPLICATION, duk_get_string(thr, -1)); + } + + duk_set_top(thr, old_top); /* restore stack top */ + } else { + DUK_D(DUK_DPRINT("no request callback, treat AppRequest as unsupported")); + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNSUPPORTED, "AppRequest unsupported by target"); + } + + return; + + fail: + duk_set_top(thr, old_top); /* restore stack top */ + DUK__SET_CONN_BROKEN(thr, 1); +} + +/* + * DumpHeap command + */ + +#if defined(DUK_USE_DEBUGGER_DUMPHEAP) +/* XXX: this has some overlap with object inspection; remove this and make + * DumpHeap return lists of heapptrs instead? + */ +DUK_LOCAL void duk__debug_dump_heaphdr(duk_hthread *thr, duk_heap *heap, duk_heaphdr *hdr) { + DUK_UNREF(heap); + + duk_debug_write_heapptr(thr, hdr); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HEAPHDR_GET_TYPE(hdr)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HEAPHDR_GET_FLAGS_RAW(hdr)); +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HEAPHDR_GET_REFCOUNT(hdr)); +#else + duk_debug_write_int(thr, (duk_int32_t) -1); +#endif + + switch (DUK_HEAPHDR_GET_TYPE(hdr)) { + case DUK_HTYPE_STRING: { + duk_hstring *h = (duk_hstring *) hdr; + + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HSTRING_GET_BYTELEN(h)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HSTRING_GET_CHARLEN(h)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HSTRING_GET_HASH(h)); + duk_debug_write_hstring(thr, h); + break; + } + case DUK_HTYPE_OBJECT: { + duk_hobject *h = (duk_hobject *) hdr; + duk_hstring *k; + duk_uint_fast32_t i; + + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_CLASS_NUMBER(h)); + duk_debug_write_heapptr(thr, (duk_heaphdr *) DUK_HOBJECT_GET_PROTOTYPE(heap, h)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_ESIZE(h)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_ENEXT(h)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_ASIZE(h)); + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_HSIZE(h)); + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(h); i++) { + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_E_GET_FLAGS(heap, h, i)); + k = DUK_HOBJECT_E_GET_KEY(heap, h, i); + duk_debug_write_heapptr(thr, (duk_heaphdr *) k); + if (k == NULL) { + duk_debug_write_int(thr, 0); /* isAccessor */ + duk_debug_write_unused(thr); + continue; + } + if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap, h, i)) { + duk_debug_write_int(thr, 1); /* isAccessor */ + duk_debug_write_heapptr(thr, (duk_heaphdr *) DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->a.get); + duk_debug_write_heapptr(thr, (duk_heaphdr *) DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->a.set); + } else { + duk_debug_write_int(thr, 0); /* isAccessor */ + + duk__debug_write_tval_heapptr(thr, &DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->v); + } + } + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ASIZE(h); i++) { + /* Note: array dump will include elements beyond + * 'length'. + */ + duk__debug_write_tval_heapptr(thr, DUK_HOBJECT_A_GET_VALUE_PTR(heap, h, i)); + } + break; + } + case DUK_HTYPE_BUFFER: { + duk_hbuffer *h = (duk_hbuffer *) hdr; + + duk_debug_write_uint(thr, (duk_uint32_t) DUK_HBUFFER_GET_SIZE(h)); + duk_debug_write_buffer(thr, (const char *) DUK_HBUFFER_GET_DATA_PTR(heap, h), (duk_size_t) DUK_HBUFFER_GET_SIZE(h)); + break; + } + default: { + DUK_D(DUK_DPRINT("invalid htype: %d", (int) DUK_HEAPHDR_GET_TYPE(hdr))); + } + } +} + +DUK_LOCAL void duk__debug_dump_heap_allocated(duk_hthread *thr, duk_heap *heap) { + duk_heaphdr *hdr; + + hdr = heap->heap_allocated; + while (hdr != NULL) { + duk__debug_dump_heaphdr(thr, heap, hdr); + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } +} + +DUK_LOCAL void duk__debug_dump_strtab(duk_hthread *thr, duk_heap *heap) { + duk_uint32_t i; + duk_hstring *h; + + for (i = 0; i < heap->st_size; i++) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + h = DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, heap->strtable16[i]); +#else + h = heap->strtable[i]; +#endif + while (h != NULL) { + duk__debug_dump_heaphdr(thr, heap, (duk_heaphdr *) h); + h = h->hdr.h_next; + } + } +} + +DUK_LOCAL void duk__debug_handle_dump_heap(duk_hthread *thr, duk_heap *heap) { + DUK_D(DUK_DPRINT("debug command DumpHeap")); + + duk_debug_write_reply(thr); + duk__debug_dump_heap_allocated(thr, heap); + duk__debug_dump_strtab(thr, heap); + duk_debug_write_eom(thr); +} +#endif /* DUK_USE_DEBUGGER_DUMPHEAP */ + +DUK_LOCAL void duk__debug_handle_get_bytecode(duk_hthread *thr, duk_heap *heap) { + duk_activation *act; + duk_hcompfunc *fun = NULL; + duk_size_t i, n; + duk_tval *tv; + duk_hobject **fn; + duk_int32_t level = -1; + duk_uint8_t ibyte; + + DUK_UNREF(heap); + + DUK_D(DUK_DPRINT("debug command GetBytecode")); + + ibyte = duk_debug_peek_byte(thr); + if (ibyte != DUK_DBG_IB_EOM) { + tv = duk_debug_read_tval(thr); + if (tv == NULL) { + /* detached */ + return; + } + if (DUK_TVAL_IS_OBJECT(tv)) { + /* tentative, checked later */ + fun = (duk_hcompfunc *) DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(fun != NULL); + } else if (DUK_TVAL_IS_NUMBER(tv)) { + level = (duk_int32_t) DUK_TVAL_GET_NUMBER(tv); + } else { + DUK_D(DUK_DPRINT("invalid argument to GetBytecode: %!T", tv)); + goto fail_args; + } + } + + if (fun == NULL) { + act = duk_hthread_get_activation_for_level(thr, level); + if (act == NULL) { + goto fail_index; + } + fun = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + } + + if (fun == NULL || !DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun)) { + DUK_D(DUK_DPRINT("invalid argument to GetBytecode: %!O", fun)); + goto fail_args; + } + DUK_ASSERT(fun != NULL && DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun)); + + duk_debug_write_reply(thr); + n = DUK_HCOMPFUNC_GET_CONSTS_COUNT(heap, fun); + duk_debug_write_int(thr, (duk_int32_t) n); + tv = DUK_HCOMPFUNC_GET_CONSTS_BASE(heap, fun); + for (i = 0; i < n; i++) { + duk_debug_write_tval(thr, tv); + tv++; + } + n = DUK_HCOMPFUNC_GET_FUNCS_COUNT(heap, fun); + duk_debug_write_int(thr, (duk_int32_t) n); + fn = DUK_HCOMPFUNC_GET_FUNCS_BASE(heap, fun); + for (i = 0; i < n; i++) { + duk_debug_write_hobject(thr, *fn); + fn++; + } + duk_debug_write_string(thr, + (const char *) DUK_HCOMPFUNC_GET_CODE_BASE(heap, fun), + (duk_size_t) DUK_HCOMPFUNC_GET_CODE_SIZE(heap, fun)); + duk_debug_write_eom(thr); + return; + + fail_args: + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid argument"); + return; + + fail_index: + duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid callstack index"); + return; +} + +/* + * Object inspection commands: GetHeapObjInfo, GetObjPropDesc, + * GetObjPropDescRange + */ + +#if defined(DUK_USE_DEBUGGER_INSPECT) + +#if 0 /* pruned */ +DUK_LOCAL const char * const duk__debug_getinfo_heaphdr_keys[] = { + "reachable", + "temproot", + "finalizable", + "finalized", + "readonly" + /* NULL not needed here */ +}; +DUK_LOCAL duk_uint_t duk__debug_getinfo_heaphdr_masks[] = { + DUK_HEAPHDR_FLAG_REACHABLE, + DUK_HEAPHDR_FLAG_TEMPROOT, + DUK_HEAPHDR_FLAG_FINALIZABLE, + DUK_HEAPHDR_FLAG_FINALIZED, + DUK_HEAPHDR_FLAG_READONLY, + 0 /* terminator */ +}; +#endif +DUK_LOCAL const char * const duk__debug_getinfo_hstring_keys[] = { +#if 0 + "arridx", + "symbol", + "hidden", + "reserved_word", + "strict_reserved_word", + "eval_or_arguments", +#endif + "extdata" + /* NULL not needed here */ +}; +DUK_LOCAL duk_uint_t duk__debug_getinfo_hstring_masks[] = { +#if 0 + DUK_HSTRING_FLAG_ARRIDX, + DUK_HSTRING_FLAG_SYMBOL, + DUK_HSTRING_FLAG_HIDDEN, + DUK_HSTRING_FLAG_RESERVED_WORD, + DUK_HSTRING_FLAG_STRICT_RESERVED_WORD, + DUK_HSTRING_FLAG_EVAL_OR_ARGUMENTS, +#endif + DUK_HSTRING_FLAG_EXTDATA, + 0 /* terminator */ +}; +DUK_LOCAL const char * const duk__debug_getinfo_hobject_keys[] = { + "extensible", + "constructable", + "callable", + "boundfunc", + "compfunc", + "natfunc", + "bufobj", + "fastrefs", + "array_part", + "strict", + "notail", + "newenv", + "namebinding", + "createargs", + "have_finalizer", + "exotic_array", + "exotic_stringobj", + "exotic_arguments", + "exotic_proxyobj", + "special_call" + /* NULL not needed here */ +}; +DUK_LOCAL duk_uint_t duk__debug_getinfo_hobject_masks[] = { + DUK_HOBJECT_FLAG_EXTENSIBLE, + DUK_HOBJECT_FLAG_CONSTRUCTABLE, + DUK_HOBJECT_FLAG_CALLABLE, + DUK_HOBJECT_FLAG_BOUNDFUNC, + DUK_HOBJECT_FLAG_COMPFUNC, + DUK_HOBJECT_FLAG_NATFUNC, + DUK_HOBJECT_FLAG_BUFOBJ, + DUK_HOBJECT_FLAG_FASTREFS, + DUK_HOBJECT_FLAG_ARRAY_PART, + DUK_HOBJECT_FLAG_STRICT, + DUK_HOBJECT_FLAG_NOTAIL, + DUK_HOBJECT_FLAG_NEWENV, + DUK_HOBJECT_FLAG_NAMEBINDING, + DUK_HOBJECT_FLAG_CREATEARGS, + DUK_HOBJECT_FLAG_HAVE_FINALIZER, + DUK_HOBJECT_FLAG_EXOTIC_ARRAY, + DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ, + DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS, + DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ, + DUK_HOBJECT_FLAG_SPECIAL_CALL, + 0 /* terminator */ +}; +DUK_LOCAL const char * const duk__debug_getinfo_hbuffer_keys[] = { + "dynamic", + "external" + /* NULL not needed here */ +}; +DUK_LOCAL duk_uint_t duk__debug_getinfo_hbuffer_masks[] = { + DUK_HBUFFER_FLAG_DYNAMIC, + DUK_HBUFFER_FLAG_EXTERNAL, + 0 /* terminator */ +}; + +DUK_LOCAL void duk__debug_getinfo_flags_key(duk_hthread *thr, const char *key) { + duk_debug_write_uint(thr, 0); + duk_debug_write_cstring(thr, key); +} + +DUK_LOCAL void duk__debug_getinfo_prop_uint(duk_hthread *thr, const char *key, duk_uint_t val) { + duk_debug_write_uint(thr, 0); + duk_debug_write_cstring(thr, key); + duk_debug_write_uint(thr, val); +} + +DUK_LOCAL void duk__debug_getinfo_prop_int(duk_hthread *thr, const char *key, duk_int_t val) { + duk_debug_write_uint(thr, 0); + duk_debug_write_cstring(thr, key); + duk_debug_write_int(thr, val); +} + +DUK_LOCAL void duk__debug_getinfo_prop_bool(duk_hthread *thr, const char *key, duk_bool_t val) { + duk_debug_write_uint(thr, 0); + duk_debug_write_cstring(thr, key); + duk_debug_write_boolean(thr, val); +} + +DUK_LOCAL void duk__debug_getinfo_bitmask(duk_hthread *thr, const char * const * keys, duk_uint_t *masks, duk_uint_t flags) { + const char *key; + duk_uint_t mask; + + for (;;) { + mask = *masks++; + if (mask == 0) { + break; + } + key = *keys++; + DUK_ASSERT(key != NULL); + + DUK_DD(DUK_DDPRINT("inspect bitmask: key=%s, mask=0x%08lx, flags=0x%08lx", key, (unsigned long) mask, (unsigned long) flags)); + duk__debug_getinfo_prop_bool(thr, key, flags & mask); + } +} + +/* Inspect a property using a virtual index into a conceptual property list + * consisting of (1) all array part items from [0,a_size[ (even when above + * .length) and (2) all entry part items from [0,e_next[. Unused slots are + * indicated using dvalue 'unused'. + */ +DUK_LOCAL duk_bool_t duk__debug_getprop_index(duk_hthread *thr, duk_heap *heap, duk_hobject *h_obj, duk_uint_t idx) { + duk_uint_t a_size; + duk_tval *tv; + duk_hstring *h_key; + duk_hobject *h_getset; + duk_uint_t flags; + + DUK_UNREF(heap); + + a_size = DUK_HOBJECT_GET_ASIZE(h_obj); + if (idx < a_size) { + duk_debug_write_uint(thr, DUK_PROPDESC_FLAGS_WEC); + duk_debug_write_uint(thr, idx); + tv = DUK_HOBJECT_A_GET_VALUE_PTR(heap, h_obj, idx); + duk_debug_write_tval(thr, tv); + return 1; + } + + idx -= a_size; + if (idx >= DUK_HOBJECT_GET_ENEXT(h_obj)) { + return 0; + } + + h_key = DUK_HOBJECT_E_GET_KEY(heap, h_obj, idx); + if (h_key == NULL) { + duk_debug_write_uint(thr, 0); + duk_debug_write_null(thr); + duk_debug_write_unused(thr); + return 1; + } + + flags = DUK_HOBJECT_E_GET_FLAGS(heap, h_obj, idx); + if (DUK_HSTRING_HAS_SYMBOL(h_key)) { + flags |= DUK_DBG_PROPFLAG_SYMBOL; + } + if (DUK_HSTRING_HAS_HIDDEN(h_key)) { + flags |= DUK_DBG_PROPFLAG_HIDDEN; + } + duk_debug_write_uint(thr, flags); + duk_debug_write_hstring(thr, h_key); + if (flags & DUK_PROPDESC_FLAG_ACCESSOR) { + h_getset = DUK_HOBJECT_E_GET_VALUE_GETTER(heap, h_obj, idx); + if (h_getset) { + duk_debug_write_hobject(thr, h_getset); + } else { + duk_debug_write_null(thr); + } + h_getset = DUK_HOBJECT_E_GET_VALUE_SETTER(heap, h_obj, idx); + if (h_getset) { + duk_debug_write_hobject(thr, h_getset); + } else { + duk_debug_write_null(thr); + } + } else { + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(heap, h_obj, idx); + duk_debug_write_tval(thr, tv); + } + return 1; +} + +DUK_LOCAL void duk__debug_handle_get_heap_obj_info(duk_hthread *thr, duk_heap *heap) { + duk_heaphdr *h; + + DUK_D(DUK_DPRINT("debug command GetHeapObjInfo")); + DUK_UNREF(heap); + + DUK_ASSERT(sizeof(duk__debug_getinfo_hstring_keys) / sizeof(const char *) == sizeof(duk__debug_getinfo_hstring_masks) / sizeof(duk_uint_t) - 1); + DUK_ASSERT(sizeof(duk__debug_getinfo_hobject_keys) / sizeof(const char *) == sizeof(duk__debug_getinfo_hobject_masks) / sizeof(duk_uint_t) - 1); + DUK_ASSERT(sizeof(duk__debug_getinfo_hbuffer_keys) / sizeof(const char *) == sizeof(duk__debug_getinfo_hbuffer_masks) / sizeof(duk_uint_t) - 1); + + h = duk_debug_read_any_ptr(thr); + if (!h) { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid target"); + return; + } + + duk_debug_write_reply(thr); + + /* As with all inspection code, we rely on the debug client providing + * a valid, non-stale pointer: there's no portable way to safely + * validate the pointer here. + */ + + duk__debug_getinfo_flags_key(thr, "heapptr"); + duk_debug_write_heapptr(thr, h); + + /* XXX: comes out as signed now */ + duk__debug_getinfo_prop_uint(thr, "heaphdr_flags", (duk_uint_t) DUK_HEAPHDR_GET_FLAGS(h)); + duk__debug_getinfo_prop_uint(thr, "heaphdr_type", (duk_uint_t) DUK_HEAPHDR_GET_TYPE(h)); +#if defined(DUK_USE_REFERENCE_COUNTING) + duk__debug_getinfo_prop_uint(thr, "refcount", (duk_uint_t) DUK_HEAPHDR_GET_REFCOUNT(h)); +#endif +#if 0 /* pruned */ + duk__debug_getinfo_bitmask(thr, + duk__debug_getinfo_heaphdr_keys, + duk__debug_getinfo_heaphdr_masks, + DUK_HEAPHDR_GET_FLAGS_RAW(h)); +#endif + + switch (DUK_HEAPHDR_GET_TYPE(h)) { + case DUK_HTYPE_STRING: { + duk_hstring *h_str; + + h_str = (duk_hstring *) h; + duk__debug_getinfo_bitmask(thr, + duk__debug_getinfo_hstring_keys, + duk__debug_getinfo_hstring_masks, + DUK_HEAPHDR_GET_FLAGS_RAW(h)); + duk__debug_getinfo_prop_uint(thr, "bytelen", (duk_uint_t) DUK_HSTRING_GET_BYTELEN(h_str)); + duk__debug_getinfo_prop_uint(thr, "charlen", (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h_str)); + duk__debug_getinfo_prop_uint(thr, "hash", (duk_uint_t) DUK_HSTRING_GET_HASH(h_str)); + duk__debug_getinfo_flags_key(thr, "data"); + duk_debug_write_hstring(thr, h_str); + break; + } + case DUK_HTYPE_OBJECT: { + duk_hobject *h_obj; + duk_hobject *h_proto; + + h_obj = (duk_hobject *) h; + h_proto = DUK_HOBJECT_GET_PROTOTYPE(heap, h_obj); + + /* duk_hobject specific fields. */ + duk__debug_getinfo_bitmask(thr, + duk__debug_getinfo_hobject_keys, + duk__debug_getinfo_hobject_masks, + DUK_HEAPHDR_GET_FLAGS_RAW(h)); + duk__debug_getinfo_prop_uint(thr, "class_number", DUK_HOBJECT_GET_CLASS_NUMBER(h_obj)); + duk__debug_getinfo_flags_key(thr, "class_name"); + duk_debug_write_hstring(thr, DUK_HOBJECT_GET_CLASS_STRING(heap, h_obj)); + duk__debug_getinfo_flags_key(thr, "prototype"); + if (h_proto != NULL) { + duk_debug_write_hobject(thr, h_proto); + } else { + duk_debug_write_null(thr); + } + duk__debug_getinfo_flags_key(thr, "props"); + duk_debug_write_pointer(thr, (void *) DUK_HOBJECT_GET_PROPS(heap, h_obj)); + duk__debug_getinfo_prop_uint(thr, "e_size", (duk_uint_t) DUK_HOBJECT_GET_ESIZE(h_obj)); + duk__debug_getinfo_prop_uint(thr, "e_next", (duk_uint_t) DUK_HOBJECT_GET_ENEXT(h_obj)); + duk__debug_getinfo_prop_uint(thr, "a_size", (duk_uint_t) DUK_HOBJECT_GET_ASIZE(h_obj)); + duk__debug_getinfo_prop_uint(thr, "h_size", (duk_uint_t) DUK_HOBJECT_GET_HSIZE(h_obj)); + + if (DUK_HOBJECT_IS_ARRAY(h_obj)) { + duk_harray *h_arr; + h_arr = (duk_harray *) h_obj; + + duk__debug_getinfo_prop_uint(thr, "length", (duk_uint_t) h_arr->length); + duk__debug_getinfo_prop_bool(thr, "length_nonwritable", h_arr->length_nonwritable); + } + + if (DUK_HOBJECT_IS_NATFUNC(h_obj)) { + duk_hnatfunc *h_fun; + h_fun = (duk_hnatfunc *) h_obj; + + duk__debug_getinfo_prop_int(thr, "nargs", h_fun->nargs); + duk__debug_getinfo_prop_int(thr, "magic", h_fun->magic); + duk__debug_getinfo_prop_bool(thr, "varargs", h_fun->magic == DUK_HNATFUNC_NARGS_VARARGS); + /* Native function pointer may be different from a void pointer, + * and we serialize it from memory directly now (no byte swapping etc). + */ + duk__debug_getinfo_flags_key(thr, "funcptr"); + duk_debug_write_buffer(thr, (const char *) &h_fun->func, sizeof(h_fun->func)); + } + + if (DUK_HOBJECT_IS_COMPFUNC(h_obj)) { + duk_hcompfunc *h_fun; + duk_hbuffer *h_buf; + duk_hobject *h_lexenv; + duk_hobject *h_varenv; + h_fun = (duk_hcompfunc *) h_obj; + + duk__debug_getinfo_prop_int(thr, "nregs", h_fun->nregs); + duk__debug_getinfo_prop_int(thr, "nargs", h_fun->nargs); + + duk__debug_getinfo_flags_key(thr, "lex_env"); + h_lexenv = DUK_HCOMPFUNC_GET_LEXENV(thr->heap, h_fun); + if (h_lexenv != NULL) { + duk_debug_write_hobject(thr, h_lexenv); + } else { + duk_debug_write_null(thr); + } + duk__debug_getinfo_flags_key(thr, "var_env"); + h_varenv = DUK_HCOMPFUNC_GET_VARENV(thr->heap, h_fun); + if (h_varenv != NULL) { + duk_debug_write_hobject(thr, h_varenv); + } else { + duk_debug_write_null(thr); + } + + duk__debug_getinfo_prop_uint(thr, "start_line", h_fun->start_line); + duk__debug_getinfo_prop_uint(thr, "end_line", h_fun->end_line); + h_buf = (duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA(thr->heap, h_fun); + if (h_buf != NULL) { + duk__debug_getinfo_flags_key(thr, "data"); + duk_debug_write_heapptr(thr, (duk_heaphdr *) h_buf); + } + } + + if (DUK_HOBJECT_IS_BOUNDFUNC(h_obj)) { + duk_hboundfunc *h_bfun; + h_bfun = (duk_hboundfunc *) (void *) h_obj; + + duk__debug_getinfo_flags_key(thr, "target"); + duk_debug_write_tval(thr, &h_bfun->target); + duk__debug_getinfo_flags_key(thr, "this_binding"); + duk_debug_write_tval(thr, &h_bfun->this_binding); + duk__debug_getinfo_flags_key(thr, "nargs"); + duk_debug_write_int(thr, h_bfun->nargs); + /* h_bfun->args not exposed now */ + } + + if (DUK_HOBJECT_IS_THREAD(h_obj)) { + /* XXX: Currently no inspection of threads, e.g. value stack, call + * stack, catch stack, etc. + */ + duk_hthread *h_thr; + h_thr = (duk_hthread *) h_obj; + DUK_UNREF(h_thr); + } + + if (DUK_HOBJECT_IS_DECENV(h_obj)) { + duk_hdecenv *h_env; + h_env = (duk_hdecenv *) h_obj; + + duk__debug_getinfo_flags_key(thr, "thread"); + duk_debug_write_heapptr(thr, (duk_heaphdr *) (h_env->thread)); + duk__debug_getinfo_flags_key(thr, "varmap"); + duk_debug_write_heapptr(thr, (duk_heaphdr *) (h_env->varmap)); + duk__debug_getinfo_prop_uint(thr, "regbase", (duk_uint_t) h_env->regbase_byteoff); + } + + if (DUK_HOBJECT_IS_OBJENV(h_obj)) { + duk_hobjenv *h_env; + h_env = (duk_hobjenv *) h_obj; + + duk__debug_getinfo_flags_key(thr, "target"); + duk_debug_write_heapptr(thr, (duk_heaphdr *) (h_env->target)); + duk__debug_getinfo_prop_bool(thr, "has_this", h_env->has_this); + } + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + if (DUK_HOBJECT_IS_BUFOBJ(h_obj)) { + duk_hbufobj *h_bufobj; + h_bufobj = (duk_hbufobj *) h_obj; + + duk__debug_getinfo_prop_uint(thr, "slice_offset", h_bufobj->offset); + duk__debug_getinfo_prop_uint(thr, "slice_length", h_bufobj->length); + duk__debug_getinfo_prop_uint(thr, "elem_shift", (duk_uint_t) h_bufobj->shift); + duk__debug_getinfo_prop_uint(thr, "elem_type", (duk_uint_t) h_bufobj->elem_type); + duk__debug_getinfo_prop_bool(thr, "is_typedarray", (duk_uint_t) h_bufobj->is_typedarray); + if (h_bufobj->buf != NULL) { + duk__debug_getinfo_flags_key(thr, "buffer"); + duk_debug_write_heapptr(thr, (duk_heaphdr *) h_bufobj->buf); + } + } +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + break; + } + case DUK_HTYPE_BUFFER: { + duk_hbuffer *h_buf; + + h_buf = (duk_hbuffer *) h; + duk__debug_getinfo_bitmask(thr, + duk__debug_getinfo_hbuffer_keys, + duk__debug_getinfo_hbuffer_masks, + DUK_HEAPHDR_GET_FLAGS_RAW(h)); + duk__debug_getinfo_prop_uint(thr, "size", (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_buf)); + duk__debug_getinfo_flags_key(thr, "dataptr"); + duk_debug_write_pointer(thr, (void *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_buf)); + duk__debug_getinfo_flags_key(thr, "data"); + duk_debug_write_hbuffer(thr, h_buf); /* tolerates NULL h_buf */ + break; + } + default: { + /* Since we already started writing the reply, just emit nothing. */ + DUK_D(DUK_DPRINT("inspect target pointer has invalid heaphdr type")); + } + } + + duk_debug_write_eom(thr); +} + +DUK_LOCAL void duk__debug_handle_get_obj_prop_desc(duk_hthread *thr, duk_heap *heap) { + duk_heaphdr *h; + duk_hobject *h_obj; + duk_hstring *h_key; + duk_propdesc desc; + + DUK_D(DUK_DPRINT("debug command GetObjPropDesc")); + DUK_UNREF(heap); + + h = duk_debug_read_any_ptr(thr); + if (!h) { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid target"); + return; + } + h_key = duk_debug_read_hstring(thr); + if (h == NULL || DUK_HEAPHDR_GET_TYPE(h) != DUK_HTYPE_OBJECT || h_key == NULL) { + goto fail_args; + } + h_obj = (duk_hobject *) h; + + if (duk_hobject_get_own_propdesc(thr, h_obj, h_key, &desc, 0 /*flags*/)) { + duk_int_t virtual_idx; + duk_bool_t rc; + + /* To use the shared helper need the virtual index. */ + DUK_ASSERT(desc.e_idx >= 0 || desc.a_idx >= 0); + virtual_idx = (desc.a_idx >= 0 ? desc.a_idx : + (duk_int_t) DUK_HOBJECT_GET_ASIZE(h_obj) + desc.e_idx); + + duk_debug_write_reply(thr); + rc = duk__debug_getprop_index(thr, heap, h_obj, (duk_uint_t) virtual_idx); + DUK_ASSERT(rc == 1); + DUK_UNREF(rc); + duk_debug_write_eom(thr); + } else { + duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "not found"); + } + return; + + fail_args: + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid args"); +} + +DUK_LOCAL void duk__debug_handle_get_obj_prop_desc_range(duk_hthread *thr, duk_heap *heap) { + duk_heaphdr *h; + duk_hobject *h_obj; + duk_uint_t idx, idx_start, idx_end; + + DUK_D(DUK_DPRINT("debug command GetObjPropDescRange")); + DUK_UNREF(heap); + + h = duk_debug_read_any_ptr(thr); + idx_start = (duk_uint_t) duk_debug_read_int(thr); + idx_end = (duk_uint_t) duk_debug_read_int(thr); + if (h == NULL || DUK_HEAPHDR_GET_TYPE(h) != DUK_HTYPE_OBJECT) { + goto fail_args; + } + h_obj = (duk_hobject *) h; + + /* The index range space is conceptually the array part followed by the + * entry part. Unlike normal enumeration all slots are exposed here as + * is and return 'unused' if the slots are not in active use. In particular + * the array part is included for the full a_size regardless of what the + * array .length is. + */ + + duk_debug_write_reply(thr); + for (idx = idx_start; idx < idx_end; idx++) { + if (!duk__debug_getprop_index(thr, heap, h_obj, idx)) { + break; + } + } + duk_debug_write_eom(thr); + return; + + fail_args: + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid args"); +} + +#endif /* DUK_USE_DEBUGGER_INSPECT */ + +/* + * Process incoming debug requests + * + * Individual request handlers can push temporaries on the value stack and + * rely on duk__debug_process_message() to restore the value stack top + * automatically. + */ + +/* Process one debug message. Automatically restore value stack top to its + * entry value, so that individual message handlers don't need exact value + * stack handling which is convenient. + */ +DUK_LOCAL void duk__debug_process_message(duk_hthread *thr) { + duk_heap *heap; + duk_uint8_t x; + duk_int32_t cmd; + duk_idx_t entry_top; + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + entry_top = duk_get_top(thr); + + x = duk_debug_read_byte(thr); + switch (x) { + case DUK_DBG_IB_REQUEST: { + cmd = duk_debug_read_int(thr); + switch (cmd) { + case DUK_DBG_CMD_BASICINFO: { + duk__debug_handle_basic_info(thr, heap); + break; + } + case DUK_DBG_CMD_TRIGGERSTATUS: { + duk__debug_handle_trigger_status(thr, heap); + break; + } + case DUK_DBG_CMD_PAUSE: { + duk__debug_handle_pause(thr, heap); + break; + } + case DUK_DBG_CMD_RESUME: { + duk__debug_handle_resume(thr, heap); + break; + } + case DUK_DBG_CMD_STEPINTO: + case DUK_DBG_CMD_STEPOVER: + case DUK_DBG_CMD_STEPOUT: { + duk__debug_handle_step(thr, heap, cmd); + break; + } + case DUK_DBG_CMD_LISTBREAK: { + duk__debug_handle_list_break(thr, heap); + break; + } + case DUK_DBG_CMD_ADDBREAK: { + duk__debug_handle_add_break(thr, heap); + break; + } + case DUK_DBG_CMD_DELBREAK: { + duk__debug_handle_del_break(thr, heap); + break; + } + case DUK_DBG_CMD_GETVAR: { + duk__debug_handle_get_var(thr, heap); + break; + } + case DUK_DBG_CMD_PUTVAR: { + duk__debug_handle_put_var(thr, heap); + break; + } + case DUK_DBG_CMD_GETCALLSTACK: { + duk__debug_handle_get_call_stack(thr, heap); + break; + } + case DUK_DBG_CMD_GETLOCALS: { + duk__debug_handle_get_locals(thr, heap); + break; + } + case DUK_DBG_CMD_EVAL: { + duk__debug_handle_eval(thr, heap); + break; + } + case DUK_DBG_CMD_DETACH: { + /* The actual detached_cb call is postponed to message loop so + * we don't need any special precautions here (just skip to EOM + * on the already closed connection). + */ + duk__debug_handle_detach(thr, heap); + break; + } +#if defined(DUK_USE_DEBUGGER_DUMPHEAP) + case DUK_DBG_CMD_DUMPHEAP: { + duk__debug_handle_dump_heap(thr, heap); + break; + } +#endif /* DUK_USE_DEBUGGER_DUMPHEAP */ + case DUK_DBG_CMD_GETBYTECODE: { + duk__debug_handle_get_bytecode(thr, heap); + break; + } + case DUK_DBG_CMD_APPREQUEST: { + duk__debug_handle_apprequest(thr, heap); + break; + } +#if defined(DUK_USE_DEBUGGER_INSPECT) + case DUK_DBG_CMD_GETHEAPOBJINFO: { + duk__debug_handle_get_heap_obj_info(thr, heap); + break; + } + case DUK_DBG_CMD_GETOBJPROPDESC: { + duk__debug_handle_get_obj_prop_desc(thr, heap); + break; + } + case DUK_DBG_CMD_GETOBJPROPDESCRANGE: { + duk__debug_handle_get_obj_prop_desc_range(thr, heap); + break; + } +#endif /* DUK_USE_DEBUGGER_INSPECT */ + default: { + DUK_D(DUK_DPRINT("debug command unsupported: %d", (int) cmd)); + duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNSUPPORTED, "unsupported command"); + } + } /* switch cmd */ + break; + } + case DUK_DBG_IB_REPLY: { + DUK_D(DUK_DPRINT("debug reply, skipping")); + break; + } + case DUK_DBG_IB_ERROR: { + DUK_D(DUK_DPRINT("debug error, skipping")); + break; + } + case DUK_DBG_IB_NOTIFY: { + DUK_D(DUK_DPRINT("debug notify, skipping")); + break; + } + default: { + DUK_D(DUK_DPRINT("invalid initial byte, drop connection: %d", (int) x)); + goto fail; + } + } /* switch initial byte */ + + DUK_ASSERT(duk_get_top(thr) >= entry_top); + duk_set_top(thr, entry_top); + duk__debug_skip_to_eom(thr); + return; + + fail: + DUK_ASSERT(duk_get_top(thr) >= entry_top); + duk_set_top(thr, entry_top); + DUK__SET_CONN_BROKEN(thr, 1); + return; +} + +DUK_LOCAL void duk__check_resend_status(duk_hthread *thr) { + if (thr->heap->dbg_read_cb != NULL && thr->heap->dbg_state_dirty) { + duk_debug_send_status(thr); + thr->heap->dbg_state_dirty = 0; + } +} + +DUK_INTERNAL duk_bool_t duk_debug_process_messages(duk_hthread *thr, duk_bool_t no_block) { +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t entry_top; +#endif + duk_bool_t retval = 0; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); +#if defined(DUK_USE_ASSERTIONS) + entry_top = duk_get_top(thr); +#endif + + DUK_D(DUK_DPRINT("process debug messages: read_cb=%s, no_block=%ld, detaching=%ld, processing=%ld", + thr->heap->dbg_read_cb ? "not NULL" : "NULL", (long) no_block, + (long) thr->heap->dbg_detaching, (long) thr->heap->dbg_processing)); + DUK_DD(DUK_DDPRINT("top at entry: %ld", (long) duk_get_top(thr))); + + /* thr->heap->dbg_detaching may be != 0 if a debugger write outside + * the message loop caused a transport error and detach1() to run. + */ + DUK_ASSERT(thr->heap->dbg_detaching == 0 || thr->heap->dbg_detaching == 1); + DUK_ASSERT(thr->heap->dbg_processing == 0); + thr->heap->dbg_processing = 1; + + /* Ensure dirty state causes a Status even if never process any + * messages. This is expected by the bytecode executor when in + * the running state. + */ + duk__check_resend_status(thr); + + for (;;) { + /* Process messages until we're no longer paused or we peek + * and see there's nothing to read right now. + */ + DUK_DD(DUK_DDPRINT("top at loop top: %ld", (long) duk_get_top(thr))); + DUK_ASSERT(thr->heap->dbg_processing == 1); + + while (thr->heap->dbg_read_cb == NULL && thr->heap->dbg_detaching) { + /* Detach is pending; can be triggered from outside the + * debugger loop (e.g. Status notify write error) or by + * previous message handling. Call detached callback + * here, in a controlled state, to ensure a possible + * reattach inside the detached_cb is handled correctly. + * + * Recheck for detach in a while loop: an immediate + * reattach involves a call to duk_debugger_attach() + * which writes a debugger handshake line immediately + * inside the API call. If the transport write fails + * for that handshake, we can immediately end up in a + * "transport broken, detaching" case several times here. + * Loop back until we're either cleanly attached or + * fully detached. + * + * NOTE: Reset dbg_processing = 1 forcibly, in case we + * re-attached; duk_debugger_attach() sets dbg_processing + * to 0 at the moment. + */ + + DUK_D(DUK_DPRINT("detach pending (dbg_read_cb == NULL, dbg_detaching != 0), call detach2")); + + duk__debug_do_detach2(thr->heap); + thr->heap->dbg_processing = 1; /* may be set to 0 by duk_debugger_attach() inside callback */ + + DUK_D(DUK_DPRINT("after detach2 (and possible reattach): dbg_read_cb=%s, dbg_detaching=%ld", + thr->heap->dbg_read_cb ? "not NULL" : "NULL", (long) thr->heap->dbg_detaching)); + } + DUK_ASSERT(thr->heap->dbg_detaching == 0); /* true even with reattach */ + DUK_ASSERT(thr->heap->dbg_processing == 1); /* even after a detach and possible reattach */ + + if (thr->heap->dbg_read_cb == NULL) { + DUK_D(DUK_DPRINT("debug connection broken (and not detaching), stop processing messages")); + break; + } + + if (!DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) || no_block) { + if (!duk_debug_read_peek(thr)) { + /* Note: peek cannot currently trigger a detach + * so the dbg_detaching == 0 assert outside the + * loop is correct. + */ + DUK_D(DUK_DPRINT("processing debug message, peek indicated no data, stop processing messages")); + break; + } + DUK_D(DUK_DPRINT("processing debug message, peek indicated there is data, handle it")); + } else { + DUK_D(DUK_DPRINT("paused, process debug message, blocking if necessary")); + } + + duk__check_resend_status(thr); + duk__debug_process_message(thr); + duk__check_resend_status(thr); + + retval = 1; /* processed one or more messages */ + } + + DUK_ASSERT(thr->heap->dbg_detaching == 0); + DUK_ASSERT(thr->heap->dbg_processing == 1); + thr->heap->dbg_processing = 0; + + /* As an initial implementation, read flush after exiting the message + * loop. If transport is broken, this is a no-op (with debug logs). + */ + duk_debug_read_flush(thr); /* this cannot initiate a detach */ + DUK_ASSERT(thr->heap->dbg_detaching == 0); + + DUK_DD(DUK_DDPRINT("top at exit: %ld", (long) duk_get_top(thr))); + +#if defined(DUK_USE_ASSERTIONS) + /* Easy to get wrong, so assert for it. */ + DUK_ASSERT(entry_top == duk_get_top(thr)); +#endif + + return retval; +} + +/* + * Halt execution helper + */ + +/* Halt execution and enter a debugger message loop until execution is resumed + * by the client. PC for the current activation may be temporarily decremented + * so that the "current" instruction will be shown by the client. This helper + * is callable from anywhere, also outside bytecode executor. + */ + +DUK_INTERNAL void duk_debug_halt_execution(duk_hthread *thr, duk_bool_t use_prev_pc) { + duk_activation *act; + duk_hcompfunc *fun; + duk_instr_t *old_pc = NULL; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(duk_debug_is_attached(thr->heap)); + DUK_ASSERT(thr->heap->dbg_processing == 0); + DUK_ASSERT(!duk_debug_is_paused(thr->heap)); + + duk_debug_set_paused(thr->heap); + + act = thr->callstack_curr; + + /* NOTE: act may be NULL if an error is thrown outside of any activation, + * which may happen in the case of, e.g. syntax errors. + */ + + /* Decrement PC if that was requested, this requires a PC sync. */ + if (act != NULL) { + duk_hthread_sync_currpc(thr); + old_pc = act->curr_pc; + fun = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + + /* Short circuit if is safe: if act->curr_pc != NULL, 'fun' is + * guaranteed to be a non-NULL ECMAScript function. + */ + DUK_ASSERT(act->curr_pc == NULL || + (fun != NULL && DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun))); + if (use_prev_pc && + act->curr_pc != NULL && + act->curr_pc > DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, fun)) { + act->curr_pc--; + } + } + + /* Process debug messages until we are no longer paused. */ + + /* NOTE: This is a bit fragile. It's important to ensure that + * duk_debug_process_messages() never throws an error or + * act->curr_pc will never be reset. + */ + + thr->heap->dbg_state_dirty = 1; + while (DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap)) { + DUK_ASSERT(duk_debug_is_attached(thr->heap)); + DUK_ASSERT(thr->heap->dbg_processing == 0); + duk_debug_process_messages(thr, 0 /*no_block*/); + } + + /* XXX: Decrementing and restoring act->curr_pc works now, but if the + * debugger message loop gains the ability to adjust the current PC + * (e.g. a forced jump) restoring the PC here will break. Another + * approach would be to use a state flag for the "decrement 1 from + * topmost activation's PC" and take it into account whenever dealing + * with PC values. + */ + if (act != NULL) { + act->curr_pc = old_pc; /* restore PC */ + } +} + +/* + * Breakpoint management + */ + +DUK_INTERNAL duk_small_int_t duk_debug_add_breakpoint(duk_hthread *thr, duk_hstring *filename, duk_uint32_t line) { + duk_heap *heap; + duk_breakpoint *b; + + /* Caller must trigger recomputation of active breakpoint list. To + * ensure stale values are not used if that doesn't happen, clear the + * active breakpoint list here. + */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(filename != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + + if (heap->dbg_breakpoint_count >= DUK_HEAP_MAX_BREAKPOINTS) { + DUK_D(DUK_DPRINT("failed to add breakpoint for %O:%ld, all breakpoint slots used", + (duk_heaphdr *) filename, (long) line)); + return -1; + } + heap->dbg_breakpoints_active[0] = (duk_breakpoint *) NULL; + b = heap->dbg_breakpoints + (heap->dbg_breakpoint_count++); + b->filename = filename; + b->line = line; + DUK_HSTRING_INCREF(thr, filename); + + return (duk_small_int_t) (heap->dbg_breakpoint_count - 1); /* index */ +} + +DUK_INTERNAL duk_bool_t duk_debug_remove_breakpoint(duk_hthread *thr, duk_small_uint_t breakpoint_index) { + duk_heap *heap; + duk_hstring *h; + duk_breakpoint *b; + duk_size_t move_size; + + /* Caller must trigger recomputation of active breakpoint list. To + * ensure stale values are not used if that doesn't happen, clear the + * active breakpoint list here. + */ + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + DUK_ASSERT(duk_debug_is_attached(thr->heap)); + DUK_ASSERT_DISABLE(breakpoint_index >= 0); /* unsigned */ + + if (breakpoint_index >= heap->dbg_breakpoint_count) { + DUK_D(DUK_DPRINT("invalid breakpoint index: %ld", (long) breakpoint_index)); + return 0; + } + b = heap->dbg_breakpoints + breakpoint_index; + + h = b->filename; + DUK_ASSERT(h != NULL); + + move_size = sizeof(duk_breakpoint) * (heap->dbg_breakpoint_count - breakpoint_index - 1); + duk_memmove((void *) b, + (const void *) (b + 1), + (size_t) move_size); + + heap->dbg_breakpoint_count--; + heap->dbg_breakpoints_active[0] = (duk_breakpoint *) NULL; + + DUK_HSTRING_DECREF(thr, h); /* side effects */ + DUK_UNREF(h); /* w/o refcounting */ + + /* Breakpoint entries above the used area are left as garbage. */ + + return 1; +} + +/* + * Misc state management + */ + +DUK_INTERNAL duk_bool_t duk_debug_is_attached(duk_heap *heap) { + return (heap->dbg_read_cb != NULL); +} + +DUK_INTERNAL duk_bool_t duk_debug_is_paused(duk_heap *heap) { + return (DUK_HEAP_HAS_DEBUGGER_PAUSED(heap) != 0); +} + +DUK_INTERNAL void duk_debug_set_paused(duk_heap *heap) { + if (duk_debug_is_paused(heap)) { + DUK_D(DUK_DPRINT("trying to set paused state when already paused, ignoring")); + } else { + DUK_HEAP_SET_DEBUGGER_PAUSED(heap); + heap->dbg_state_dirty = 1; + duk_debug_clear_pause_state(heap); + DUK_ASSERT(heap->ms_running == 0); /* debugger can't be triggered within mark-and-sweep */ + heap->ms_running = 1; /* prevent mark-and-sweep, prevent refzero queueing */ + heap->ms_prevent_count++; + DUK_ASSERT(heap->ms_prevent_count != 0); /* Wrap. */ + DUK_ASSERT(heap->heap_thread != NULL); + } +} + +DUK_INTERNAL void duk_debug_clear_paused(duk_heap *heap) { + if (duk_debug_is_paused(heap)) { + DUK_HEAP_CLEAR_DEBUGGER_PAUSED(heap); + heap->dbg_state_dirty = 1; + duk_debug_clear_pause_state(heap); + DUK_ASSERT(heap->ms_running == 1); + DUK_ASSERT(heap->ms_prevent_count > 0); + heap->ms_prevent_count--; + heap->ms_running = 0; + DUK_ASSERT(heap->heap_thread != NULL); + } else { + DUK_D(DUK_DPRINT("trying to clear paused state when not paused, ignoring")); + } +} + +DUK_INTERNAL void duk_debug_clear_pause_state(duk_heap *heap) { + heap->dbg_pause_flags = 0; + heap->dbg_pause_act = NULL; + heap->dbg_pause_startline = 0; +} + +#else /* DUK_USE_DEBUGGER_SUPPORT */ + +/* No debugger support. */ + +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +/* automatic undefs */ +#undef DUK__DBG_TPORT_ENTER +#undef DUK__DBG_TPORT_EXIT +#undef DUK__SET_CONN_BROKEN +#line 1 "duk_error_augment.c" +/* + * Augmenting errors at their creation site and their throw site. + * + * When errors are created, traceback data is added by built-in code + * and a user error handler (if defined) can process or replace the + * error. Similarly, when errors are thrown, a user error handler + * (if defined) can process or replace the error. + * + * Augmentation and other processing at error creation time is nice + * because an error is only created once, but it may be thrown and + * rethrown multiple times. User error handler registered for processing + * an error at its throw site must be careful to handle rethrowing in + * a useful manner. + * + * Error augmentation may throw an internal error (e.g. alloc error). + * + * ECMAScript allows throwing any values, so all values cannot be + * augmented. Currently, the built-in augmentation at error creation + * only augments error values which are Error instances (= have the + * built-in Error.prototype in their prototype chain) and are also + * extensible. User error handlers have no limitations in this respect. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Helper for calling a user error handler. + * + * 'thr' must be the currently active thread; the error handler is called + * in its context. The valstack of 'thr' must have the error value on + * top, and will be replaced by another error value based on the return + * value of the error handler. + * + * The helper calls duk_handle_call() recursively in protected mode. + * Before that call happens, no longjmps should happen; as a consequence, + * we must assume that the valstack contains enough temporary space for + * arguments and such. + * + * While the error handler runs, any errors thrown will not trigger a + * recursive error handler call (this is implemented using a heap level + * flag which will "follow" through any coroutines resumed inside the + * error handler). If the error handler is not callable or throws an + * error, the resulting error replaces the original error (for Duktape + * internal errors, duk_error_throw.c further substitutes this error with + * a DoubleError which is not ideal). This would be easy to change and + * even signal to the caller. + * + * The user error handler is stored in 'Duktape.errCreate' or + * 'Duktape.errThrow' depending on whether we're augmenting the error at + * creation or throw time. There are several alternatives to this approach, + * see doc/error-objects.rst for discussion. + * + * Note: since further longjmp()s may occur while calling the error handler + * (for many reasons, e.g. a labeled 'break' inside the handler), the + * caller can make no assumptions on the thr->heap->lj state after the + * call (this affects especially duk_error_throw.c). This is not an issue + * as long as the caller writes to the lj state only after the error handler + * finishes. + */ + +#if defined(DUK_USE_ERRTHROW) || defined(DUK_USE_ERRCREATE) +DUK_LOCAL void duk__err_augment_user(duk_hthread *thr, duk_small_uint_t stridx_cb) { + duk_tval *tv_hnd; + duk_int_t rc; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT_STRIDX_VALID(stridx_cb); + + if (thr->heap->augmenting_error) { + DUK_D(DUK_DPRINT("recursive call to error augmentation, ignore")); + return; + } + + /* + * Check whether or not we have an error handler. + * + * We must be careful of not triggering an error when looking up the + * property. For instance, if the property is a getter, we don't want + * to call it, only plain values are allowed. The value, if it exists, + * is not checked. If the value is not a function, a TypeError happens + * when it is called and that error replaces the original one. + */ + + DUK_ASSERT_VALSTACK_SPACE(thr, 4); /* 3 entries actually needed below */ + + /* [ ... errval ] */ + + if (thr->builtins[DUK_BIDX_DUKTAPE] == NULL) { + /* When creating built-ins, some of the built-ins may not be set + * and we want to tolerate that when throwing errors. + */ + DUK_DD(DUK_DDPRINT("error occurred when DUK_BIDX_DUKTAPE is NULL, ignoring")); + return; + } + tv_hnd = duk_hobject_find_existing_entry_tval_ptr(thr->heap, + thr->builtins[DUK_BIDX_DUKTAPE], + DUK_HTHREAD_GET_STRING(thr, stridx_cb)); + if (tv_hnd == NULL) { + DUK_DD(DUK_DDPRINT("error handler does not exist or is not a plain value: %!T", + (duk_tval *) tv_hnd)); + return; + } + DUK_DDD(DUK_DDDPRINT("error handler dump (callability not checked): %!T", + (duk_tval *) tv_hnd)); + duk_push_tval(thr, tv_hnd); + + /* [ ... errval errhandler ] */ + + duk_insert(thr, -2); /* -> [ ... errhandler errval ] */ + duk_push_undefined(thr); + duk_insert(thr, -2); /* -> [ ... errhandler undefined(= this) errval ] */ + + /* [ ... errhandler undefined errval ] */ + + /* + * heap->augmenting_error prevents recursive re-entry and also causes + * call handling to use a larger (but not unbounded) call stack limit + * for the duration of error augmentation. + * + * We ignore errors now: a success return and an error value both + * replace the original error value. (This would be easy to change.) + */ + + DUK_ASSERT(thr->heap->augmenting_error == 0); + thr->heap->augmenting_error = 1; + + rc = duk_pcall_method(thr, 1); + DUK_UNREF(rc); /* no need to check now: both success and error are OK */ + + DUK_ASSERT(thr->heap->augmenting_error == 1); + thr->heap->augmenting_error = 0; + + /* [ ... errval ] */ +} +#endif /* DUK_USE_ERRTHROW || DUK_USE_ERRCREATE */ + +/* + * Add ._Tracedata to an error on the stack top. + */ + +#if defined(DUK_USE_TRACEBACKS) +DUK_LOCAL void duk__add_traceback(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_small_uint_t flags) { + duk_activation *act; + duk_int_t depth; + duk_int_t arr_size; + duk_tval *tv; + duk_hstring *s; + duk_uint32_t u32; + duk_double_t d; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr_callstack != NULL); + + /* [ ... error ] */ + + /* + * The traceback format is pretty arcane in an attempt to keep it compact + * and cheap to create. It may change arbitrarily from version to version. + * It should be decoded/accessed through version specific accessors only. + * + * See doc/error-objects.rst. + */ + + DUK_DDD(DUK_DDDPRINT("adding traceback to object: %!T", + (duk_tval *) duk_get_tval(thr, -1))); + + /* Preallocate array to correct size, so that we can just write out + * the _Tracedata values into the array part. + */ + act = thr->callstack_curr; + depth = DUK_USE_TRACEBACK_DEPTH; + DUK_ASSERT(thr_callstack->callstack_top <= DUK_INT_MAX); /* callstack limits */ + if (depth > (duk_int_t) thr_callstack->callstack_top) { + depth = (duk_int_t) thr_callstack->callstack_top; + } + if (depth > 0) { + if (flags & DUK_AUGMENT_FLAG_SKIP_ONE) { + DUK_ASSERT(act != NULL); + act = act->parent; + depth--; + } + } + arr_size = depth * 2; + if (thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL) { + arr_size += 2; + } + if (c_filename) { + /* We need the C filename to be interned before getting the + * array part pointer to avoid any GC interference while the + * array part is populated. + */ + duk_push_string(thr, c_filename); + arr_size += 2; + } + + /* XXX: uninitialized would be OK */ + DUK_D(DUK_DPRINT("preallocated _Tracedata to %ld items", (long) arr_size)); + tv = duk_push_harray_with_size_outptr(thr, (duk_uint32_t) arr_size); + DUK_ASSERT(arr_size == 0 || tv != NULL); + + /* Compiler SyntaxErrors (and other errors) come first, and are + * blamed by default (not flagged "noblame"). + */ + if (thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL) { + s = thr->compile_ctx->h_filename; + DUK_TVAL_SET_STRING(tv, s); + DUK_HSTRING_INCREF(thr, s); + tv++; + + u32 = (duk_uint32_t) thr->compile_ctx->curr_token.start_line; /* (flags<<32) + (line), flags = 0 */ + DUK_TVAL_SET_U32(tv, u32); + tv++; + } + + /* Filename/line from C macros (__FILE__, __LINE__) are added as an + * entry with a special format: (string, number). The number contains + * the line and flags. + */ + + /* [ ... error c_filename? arr ] */ + + if (c_filename) { + DUK_ASSERT(DUK_TVAL_IS_STRING(thr->valstack_top - 2)); + s = DUK_TVAL_GET_STRING(thr->valstack_top - 2); /* interned c_filename */ + DUK_ASSERT(s != NULL); + DUK_TVAL_SET_STRING(tv, s); + DUK_HSTRING_INCREF(thr, s); + tv++; + + d = ((flags & DUK_AUGMENT_FLAG_NOBLAME_FILELINE) ? ((duk_double_t) DUK_TB_FLAG_NOBLAME_FILELINE) * DUK_DOUBLE_2TO32 : 0.0) + + (duk_double_t) c_line; + DUK_TVAL_SET_DOUBLE(tv, d); + tv++; + } + + /* Traceback depth doesn't take into account the filename/line + * special handling above (intentional). + */ + for (; depth-- > 0; act = act->parent) { + duk_uint32_t pc; + duk_tval *tv_src; + + /* [... arr] */ + + DUK_ASSERT(act != NULL); /* depth check above, assumes book-keeping is correct */ + DUK_ASSERT_DISABLE(act->pc >= 0); /* unsigned */ + + /* Add function object. */ + tv_src = &act->tv_func; /* object (function) or lightfunc */ + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv_src) || DUK_TVAL_IS_LIGHTFUNC(tv_src)); + DUK_TVAL_SET_TVAL(tv, tv_src); + DUK_TVAL_INCREF(thr, tv); + tv++; + + /* Add a number containing: pc, activation flags. + * + * PC points to next instruction, find offending PC. Note that + * PC == 0 for native code. + */ + pc = (duk_uint32_t) duk_hthread_get_act_prev_pc(thr_callstack, act); + DUK_ASSERT_DISABLE(pc >= 0); /* unsigned */ + DUK_ASSERT((duk_double_t) pc < DUK_DOUBLE_2TO32); /* assume PC is at most 32 bits and non-negative */ + d = ((duk_double_t) act->flags) * DUK_DOUBLE_2TO32 + (duk_double_t) pc; + DUK_TVAL_SET_DOUBLE(tv, d); + tv++; + } + +#if defined(DUK_USE_ASSERTIONS) + { + duk_harray *a; + a = (duk_harray *) duk_known_hobject(thr, -1); + DUK_ASSERT(a != NULL); + DUK_ASSERT((duk_uint32_t) (tv - DUK_HOBJECT_A_GET_BASE(thr->heap, (duk_hobject *) a)) == a->length); + DUK_ASSERT(a->length == (duk_uint32_t) arr_size); + } +#endif + + /* [ ... error c_filename? arr ] */ + + if (c_filename) { + duk_remove_m2(thr); + } + + /* [ ... error arr ] */ + + duk_xdef_prop_stridx_short_wec(thr, -2, DUK_STRIDX_INT_TRACEDATA); /* -> [ ... error ] */ +} +#endif /* DUK_USE_TRACEBACKS */ + +/* + * Add .fileName and .lineNumber to an error on the stack top. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) && !defined(DUK_USE_TRACEBACKS) +DUK_LOCAL void duk__add_fileline(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_small_uint_t flags) { +#if defined(DUK_USE_ASSERTIONS) + duk_int_t entry_top; +#endif + +#if defined(DUK_USE_ASSERTIONS) + entry_top = duk_get_top(thr); +#endif + + /* + * If tracebacks are disabled, 'fileName' and 'lineNumber' are added + * as plain own properties. Since Error.prototype has accessors of + * the same name, we need to define own properties directly (cannot + * just use e.g. duk_put_prop_stridx). Existing properties are not + * overwritten in case they already exist. + */ + + if (thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL) { + /* Compiler SyntaxError (or other error) gets the primary blame. + * Currently no flag to prevent blaming. + */ + duk_push_uint(thr, (duk_uint_t) thr->compile_ctx->curr_token.start_line); + duk_push_hstring(thr, thr->compile_ctx->h_filename); + } else if (c_filename && (flags & DUK_AUGMENT_FLAG_NOBLAME_FILELINE) == 0) { + /* C call site gets blamed next, unless flagged not to do so. + * XXX: file/line is disabled in minimal builds, so disable this + * too when appropriate. + */ + duk_push_int(thr, c_line); + duk_push_string(thr, c_filename); + } else { + /* Finally, blame the innermost callstack entry which has a + * .fileName property. + */ + duk_small_uint_t depth; + duk_uint32_t ecma_line; + duk_activation *act; + + DUK_ASSERT(thr_callstack->callstack_top <= DUK_INT_MAX); /* callstack limits */ + depth = DUK_USE_TRACEBACK_DEPTH; + if (depth > thr_callstack->callstack_top) { + depth = thr_callstack->callstack_top; + } + for (act = thr_callstack->callstack_curr; depth-- > 0; act = act->parent) { + duk_hobject *func; + duk_uint32_t pc; + + DUK_ASSERT(act != NULL); + func = DUK_ACT_GET_FUNC(act); + if (func == NULL) { + /* Lightfunc, not blamed now. */ + continue; + } + + /* PC points to next instruction, find offending PC, + * PC == 0 for native code. + */ + pc = duk_hthread_get_act_prev_pc(thr, act); /* thr argument only used for thr->heap, so specific thread doesn't matter */ + DUK_UNREF(pc); + DUK_ASSERT_DISABLE(pc >= 0); /* unsigned */ + DUK_ASSERT((duk_double_t) pc < DUK_DOUBLE_2TO32); /* assume PC is at most 32 bits and non-negative */ + + duk_push_hobject(thr, func); + + /* [ ... error func ] */ + + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_FILE_NAME); + if (!duk_is_string_notsymbol(thr, -1)) { + duk_pop_2(thr); + continue; + } + + /* [ ... error func fileName ] */ + + ecma_line = 0; +#if defined(DUK_USE_PC2LINE) + if (DUK_HOBJECT_IS_COMPFUNC(func)) { + ecma_line = duk_hobject_pc2line_query(thr, -2, (duk_uint_fast32_t) pc); + } else { + /* Native function, no relevant lineNumber. */ + } +#endif /* DUK_USE_PC2LINE */ + duk_push_u32(thr, ecma_line); + + /* [ ... error func fileName lineNumber ] */ + + duk_replace(thr, -3); + + /* [ ... error lineNumber fileName ] */ + goto define_props; + } + + /* No activation matches, use undefined for both .fileName and + * .lineNumber (matches what we do with a _Tracedata based + * no-match lookup. + */ + duk_push_undefined(thr); + duk_push_undefined(thr); + } + + define_props: + /* [ ... error lineNumber fileName ] */ +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(duk_get_top(thr) == entry_top + 2); +#endif + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_FILE_NAME, DUK_PROPDESC_FLAGS_C | DUK_PROPDESC_FLAG_NO_OVERWRITE); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LINE_NUMBER, DUK_PROPDESC_FLAGS_C | DUK_PROPDESC_FLAG_NO_OVERWRITE); +} +#endif /* DUK_USE_AUGMENT_ERROR_CREATE && !DUK_USE_TRACEBACKS */ + +/* + * Add line number to a compiler error. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) +DUK_LOCAL void duk__add_compiler_error_line(duk_hthread *thr) { + + /* Append a "(line NNN)" to the "message" property of any error + * thrown during compilation. Usually compilation errors are + * SyntaxErrors but they can also be out-of-memory errors and + * the like. + */ + + /* [ ... error ] */ + + DUK_ASSERT(duk_is_object(thr, -1)); + + if (!(thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL)) { + return; + } + + DUK_DDD(DUK_DDDPRINT("compile error, before adding line info: %!T", + (duk_tval *) duk_get_tval(thr, -1))); + + if (duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_MESSAGE)) { + duk_push_sprintf(thr, " (line %ld)", (long) thr->compile_ctx->curr_token.start_line); + duk_concat(thr, 2); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_MESSAGE); + } else { + duk_pop(thr); + } + + DUK_DDD(DUK_DDDPRINT("compile error, after adding line info: %!T", + (duk_tval *) duk_get_tval(thr, -1))); +} +#endif /* DUK_USE_AUGMENT_ERROR_CREATE */ + +/* + * Augment an error being created using Duktape specific properties + * like _Tracedata or .fileName/.lineNumber. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) +DUK_LOCAL void duk__err_augment_builtin_create(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_hobject *obj, duk_small_uint_t flags) { +#if defined(DUK_USE_ASSERTIONS) + duk_int_t entry_top; +#endif + +#if defined(DUK_USE_ASSERTIONS) + entry_top = duk_get_top(thr); +#endif + DUK_ASSERT(obj != NULL); + + DUK_UNREF(obj); /* unreferenced w/o tracebacks */ + + duk__add_compiler_error_line(thr); + +#if defined(DUK_USE_TRACEBACKS) + /* If tracebacks are enabled, the '_Tracedata' property is the only + * thing we need: 'fileName' and 'lineNumber' are virtual properties + * which use '_Tracedata'. + */ + if (duk_hobject_hasprop_raw(thr, obj, DUK_HTHREAD_STRING_INT_TRACEDATA(thr))) { + DUK_DDD(DUK_DDDPRINT("error value already has a '_Tracedata' property, not modifying it")); + } else { + duk__add_traceback(thr, thr_callstack, c_filename, c_line, flags); + } +#else + /* Without tracebacks the concrete .fileName and .lineNumber need + * to be added directly. + */ + duk__add_fileline(thr, thr_callstack, c_filename, c_line, flags); +#endif + +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(duk_get_top(thr) == entry_top); +#endif +} +#endif /* DUK_USE_AUGMENT_ERROR_CREATE */ + +/* + * Augment an error at creation time with _Tracedata/fileName/lineNumber + * and allow a user error handler (if defined) to process/replace the error. + * The error to be augmented is at the stack top. + * + * thr: thread containing the error value + * thr_callstack: thread which should be used for generating callstack etc. + * c_filename: C __FILE__ related to the error + * c_line: C __LINE__ related to the error + * flags & DUK_AUGMENT_FLAG_NOBLAME_FILELINE: + * if true, don't fileName/line as error source, otherwise use traceback + * (needed because user code filename/line are reported but internal ones + * are not) + */ + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) +DUK_INTERNAL void duk_err_augment_error_create(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_small_uint_t flags) { + duk_hobject *obj; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr_callstack != NULL); + + /* [ ... error ] */ + + /* + * Criteria for augmenting: + * + * - augmentation enabled in build (naturally) + * - error value internal prototype chain contains the built-in + * Error prototype object (i.e. 'val instanceof Error') + * + * Additional criteria for built-in augmenting: + * + * - error value is an extensible object + */ + + obj = duk_get_hobject(thr, -1); + if (!obj) { + DUK_DDD(DUK_DDDPRINT("value is not an object, skip both built-in and user augment")); + return; + } + if (!duk_hobject_prototype_chain_contains(thr, obj, thr->builtins[DUK_BIDX_ERROR_PROTOTYPE], 1 /*ignore_loop*/)) { + /* If the value has a prototype loop, it's critical not to + * throw here. Instead, assume the value is not to be + * augmented. + */ + DUK_DDD(DUK_DDDPRINT("value is not an error instance, skip both built-in and user augment")); + return; + } + if (DUK_HOBJECT_HAS_EXTENSIBLE(obj)) { + DUK_DDD(DUK_DDDPRINT("error meets criteria, built-in augment")); + duk__err_augment_builtin_create(thr, thr_callstack, c_filename, c_line, obj, flags); + } else { + DUK_DDD(DUK_DDDPRINT("error does not meet criteria, no built-in augment")); + } + + /* [ ... error ] */ + +#if defined(DUK_USE_ERRCREATE) + duk__err_augment_user(thr, DUK_STRIDX_ERR_CREATE); +#endif +} +#endif /* DUK_USE_AUGMENT_ERROR_CREATE */ + +/* + * Augment an error at throw time; allow a user error handler (if defined) + * to process/replace the error. The error to be augmented is at the + * stack top. + */ + +#if defined(DUK_USE_AUGMENT_ERROR_THROW) +DUK_INTERNAL void duk_err_augment_error_throw(duk_hthread *thr) { +#if defined(DUK_USE_ERRTHROW) + duk__err_augment_user(thr, DUK_STRIDX_ERR_THROW); +#endif /* DUK_USE_ERRTHROW */ +} +#endif /* DUK_USE_AUGMENT_ERROR_THROW */ +#line 1 "duk_error_longjmp.c" +/* + * Do a longjmp call, calling the fatal error handler if no + * catchpoint exists. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_PREFER_SIZE) +DUK_NORETURN(DUK_LOCAL_DECL void duk__uncaught_minimal(duk_hthread *thr)); +DUK_LOCAL void duk__uncaught_minimal(duk_hthread *thr) { + (void) duk_fatal(thr, "uncaught error"); + DUK_WO_NORETURN(return;); +} +#endif + +#if 0 +DUK_NORETURN(DUK_LOCAL_DECL void duk__uncaught_readable(duk_hthread *thr)); +DUK_LOCAL void duk__uncaught_readable(duk_hthread *thr) { + const char *summary; + char buf[DUK_USE_FATAL_MAXLEN]; + + summary = duk_push_string_tval_readable(thr, &thr->heap->lj.value1); + DUK_SNPRINTF(buf, sizeof(buf), "uncaught: %s", summary); + buf[sizeof(buf) - 1] = (char) 0; + (void) duk_fatal(thr, (const char *) buf); + DUK_WO_NORETURN(return;); +} +#endif + +#if !defined(DUK_USE_PREFER_SIZE) +DUK_NORETURN(DUK_LOCAL_DECL void duk__uncaught_error_aware(duk_hthread *thr)); +DUK_LOCAL void duk__uncaught_error_aware(duk_hthread *thr) { + const char *summary; + char buf[DUK_USE_FATAL_MAXLEN]; + + summary = duk_push_string_tval_readable_error(thr, &thr->heap->lj.value1); + DUK_ASSERT(summary != NULL); + DUK_SNPRINTF(buf, sizeof(buf), "uncaught: %s", summary); + buf[sizeof(buf) - 1] = (char) 0; + (void) duk_fatal(thr, (const char *) buf); + DUK_WO_NORETURN(return;); +} +#endif + +DUK_INTERNAL void duk_err_longjmp(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + + DUK_DD(DUK_DDPRINT("longjmp error: type=%d iserror=%d value1=%!T value2=%!T", + (int) thr->heap->lj.type, (int) thr->heap->lj.iserror, + &thr->heap->lj.value1, &thr->heap->lj.value2)); + + /* Prevent finalizer execution during error handling. All error + * handling sites will process pending finalizers once error handling + * is complete and we're ready for the side effects. Does not prevent + * refzero freeing or mark-and-sweep during error handling. + * + * NOTE: when we come here some calling code may have used DECREF + * NORZ macros without an explicit DUK_REFZERO_CHECK_xxx() call. + * We don't want to do it here because it would just check for + * pending finalizers and we prevent that explicitly. Instead, + * the error catcher will run the finalizers once error handling + * is complete. + */ + + DUK_ASSERT_LJSTATE_SET(thr->heap); + + thr->heap->pf_prevent_count++; + DUK_ASSERT(thr->heap->pf_prevent_count != 0); /* Wrap. */ + +#if defined(DUK_USE_ASSERTIONS) + /* XXX: set this immediately when longjmp state is set */ + DUK_ASSERT(thr->heap->error_not_allowed == 0); /* Detect error within critical section. */ + thr->heap->error_not_allowed = 1; +#endif + + DUK_DD(DUK_DDPRINT("about to longjmp, pf_prevent_count=%ld", (long) thr->heap->pf_prevent_count)); + + /* If we don't have a jmpbuf_ptr, there is little we can do except + * cause a fatal error. The caller's expectation is that we never + * return. + */ + if (!thr->heap->lj.jmpbuf_ptr) { + DUK_D(DUK_DPRINT("uncaught error: type=%d iserror=%d value1=%!T value2=%!T", + (int) thr->heap->lj.type, (int) thr->heap->lj.iserror, + &thr->heap->lj.value1, &thr->heap->lj.value2)); + +#if defined(DUK_USE_PREFER_SIZE) + duk__uncaught_minimal(thr); +#else + duk__uncaught_error_aware(thr); +#endif + DUK_UNREACHABLE(); + } + +#if defined(DUK_USE_CPP_EXCEPTIONS) + throw duk_internal_exception(); /* dummy */ +#else + DUK_LONGJMP(thr->heap->lj.jmpbuf_ptr->jb); +#endif + + DUK_UNREACHABLE(); +} +#line 1 "duk_error_misc.c" +/* + * Error helpers + */ + +/* #include duk_internal.h -> already included */ + +/* + * Helper to walk the thread chain and see if there is an active error + * catcher. Protected calls or finally blocks aren't considered catching. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_LOCAL duk_bool_t duk__have_active_catcher(duk_hthread *thr) { + /* As noted above, a protected API call won't be counted as a + * catcher. This is usually convenient, e.g. in the case of a top- + * level duk_pcall(), but may not always be desirable. Perhaps add + * an argument to treat them as catchers? + */ + + duk_activation *act; + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + + for (; thr != NULL; thr = thr->resumer) { + for (act = thr->callstack_curr; act != NULL; act = act->parent) { + for (cat = act->cat; cat != NULL; cat = cat->parent) { + if (DUK_CAT_HAS_CATCH_ENABLED(cat)) { + return 1; /* all we need to know */ + } + } + } + } + return 0; +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +/* + * Get prototype object for an integer error code. + */ + +DUK_INTERNAL duk_hobject *duk_error_prototype_from_code(duk_hthread *thr, duk_errcode_t code) { + switch (code) { + case DUK_ERR_EVAL_ERROR: + return thr->builtins[DUK_BIDX_EVAL_ERROR_PROTOTYPE]; + case DUK_ERR_RANGE_ERROR: + return thr->builtins[DUK_BIDX_RANGE_ERROR_PROTOTYPE]; + case DUK_ERR_REFERENCE_ERROR: + return thr->builtins[DUK_BIDX_REFERENCE_ERROR_PROTOTYPE]; + case DUK_ERR_SYNTAX_ERROR: + return thr->builtins[DUK_BIDX_SYNTAX_ERROR_PROTOTYPE]; + case DUK_ERR_TYPE_ERROR: + return thr->builtins[DUK_BIDX_TYPE_ERROR_PROTOTYPE]; + case DUK_ERR_URI_ERROR: + return thr->builtins[DUK_BIDX_URI_ERROR_PROTOTYPE]; + case DUK_ERR_ERROR: + default: + return thr->builtins[DUK_BIDX_ERROR_PROTOTYPE]; + } +} + +/* + * Helper for debugger throw notify and pause-on-uncaught integration. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_INTERNAL void duk_err_check_debugger_integration(duk_hthread *thr) { + duk_bool_t uncaught; + duk_tval *tv_obj; + + /* If something is thrown with the debugger attached and nobody will + * catch it, execution is paused before the longjmp, turning over + * control to the debug client. This allows local state to be examined + * before the stack is unwound. Errors are not intercepted when debug + * message loop is active (e.g. for Eval). + */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + + /* XXX: Allow customizing the pause and notify behavior at runtime + * using debugger runtime flags. For now the behavior is fixed using + * config options. + */ + + if (!duk_debug_is_attached(thr->heap) || + thr->heap->dbg_processing || + thr->heap->lj.type != DUK_LJ_TYPE_THROW || + thr->heap->creating_error) { + DUK_D(DUK_DPRINT("skip debugger error integration; not attached, debugger processing, not THROW, or error thrown while creating error")); + return; + } + + /* Don't intercept a DoubleError, we may have caused the initial double + * fault and attempting to intercept it will cause us to be called + * recursively and exhaust the C stack. (This should no longer happen + * for the initial throw because DoubleError path doesn't do a debugger + * integration check, but it might happen for rethrows.) + */ + tv_obj = &thr->heap->lj.value1; + if (DUK_TVAL_IS_OBJECT(tv_obj) && DUK_TVAL_GET_OBJECT(tv_obj) == thr->builtins[DUK_BIDX_DOUBLE_ERROR]) { + DUK_D(DUK_DPRINT("built-in DoubleError instance (re)thrown, not intercepting")); + return; + } + + uncaught = !duk__have_active_catcher(thr); + + /* Debugger code expects the value at stack top. This also serves + * as a backup: we need to store/restore the longjmp state because + * when the debugger is paused Eval commands may be executed and + * they can arbitrarily clobber the longjmp state. + */ + duk_push_tval(thr, tv_obj); + + /* Store and reset longjmp state. */ + DUK_ASSERT_LJSTATE_SET(thr->heap); + DUK_TVAL_DECREF_NORZ(thr, tv_obj); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value2)); /* Always for THROW type. */ + DUK_TVAL_SET_UNDEFINED(tv_obj); + thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN; + DUK_ASSERT_LJSTATE_UNSET(thr->heap); + +#if defined(DUK_USE_DEBUGGER_THROW_NOTIFY) + /* Report it to the debug client */ + DUK_D(DUK_DPRINT("throw with debugger attached, report to client")); + duk_debug_send_throw(thr, uncaught); +#endif + + if (uncaught) { + if (thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_UNCAUGHT_ERROR) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by uncaught error")); + duk_debug_halt_execution(thr, 1 /*use_prev_pc*/); + } + } else { + if (thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_CAUGHT_ERROR) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by caught error")); + duk_debug_halt_execution(thr, 1 /*use_prev_pc*/); + } + } + + /* Restore longjmp state. */ + DUK_ASSERT_LJSTATE_UNSET(thr->heap); + thr->heap->lj.type = DUK_LJ_TYPE_THROW; + tv_obj = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value1)); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value2)); + DUK_TVAL_SET_TVAL(&thr->heap->lj.value1, tv_obj); + DUK_TVAL_INCREF(thr, tv_obj); + DUK_ASSERT_LJSTATE_SET(thr->heap); + + duk_pop(thr); +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +/* + * Helpers for setting up heap longjmp state. + */ + +DUK_INTERNAL void duk_err_setup_ljstate1(duk_hthread *thr, duk_small_uint_t lj_type, duk_tval *tv_val) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + heap = thr->heap; + DUK_ASSERT(heap != NULL); + DUK_ASSERT(tv_val != NULL); + + DUK_ASSERT_LJSTATE_UNSET(heap); + + heap->lj.type = lj_type; + DUK_TVAL_SET_TVAL(&heap->lj.value1, tv_val); + DUK_TVAL_INCREF(thr, tv_val); + + DUK_ASSERT_LJSTATE_SET(heap); +} +#line 1 "duk_error_throw.c" +/* + * Create and throw an ECMAScript error object based on a code and a message. + * + * Used when we throw errors internally. ECMAScript generated error objects + * are created by ECMAScript code, and the throwing is handled by the bytecode + * executor. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Create and throw an error (originating from Duktape internally) + * + * Push an error object on top of the stack, possibly throw augmenting + * the error, and finally longjmp. + * + * If an error occurs while we're dealing with the current error, we might + * enter an infinite recursion loop. This is prevented by detecting a + * "double fault" through the heap->creating_error flag; the recursion + * then stops at the second level. + */ + +#if defined(DUK_USE_VERBOSE_ERRORS) +DUK_INTERNAL void duk_err_create_and_throw(duk_hthread *thr, duk_errcode_t code, const char *msg, const char *filename, duk_int_t line) { +#else +DUK_INTERNAL void duk_err_create_and_throw(duk_hthread *thr, duk_errcode_t code) { +#endif +#if defined(DUK_USE_VERBOSE_ERRORS) + DUK_DD(DUK_DDPRINT("duk_err_create_and_throw(): code=%ld, msg=%s, filename=%s, line=%ld", + (long) code, (const char *) msg, + (const char *) filename, (long) line)); +#else + DUK_DD(DUK_DDPRINT("duk_err_create_and_throw(): code=%ld", (long) code)); +#endif + + DUK_ASSERT(thr != NULL); + + /* Even though nested call is possible because we throw an error when + * trying to create an error, the potential errors must happen before + * the longjmp state is configured. + */ + DUK_ASSERT_LJSTATE_UNSET(thr->heap); + + /* Sync so that augmentation sees up-to-date activations, NULL + * thr->ptr_curr_pc so that it's not used if side effects occur + * in augmentation or longjmp handling. + */ + duk_hthread_sync_and_null_currpc(thr); + + /* + * Create and push an error object onto the top of stack. + * The error is potentially augmented before throwing. + * + * If a "double error" occurs, use a fixed error instance + * to avoid further trouble. + */ + + if (thr->heap->creating_error) { + duk_tval tv_val; + duk_hobject *h_err; + + thr->heap->creating_error = 0; + + h_err = thr->builtins[DUK_BIDX_DOUBLE_ERROR]; + if (h_err != NULL) { + DUK_D(DUK_DPRINT("double fault detected -> use built-in fixed 'double error' instance")); + DUK_TVAL_SET_OBJECT(&tv_val, h_err); + } else { + DUK_D(DUK_DPRINT("double fault detected; there is no built-in fixed 'double error' instance " + "-> use the error code as a number")); + DUK_TVAL_SET_I32(&tv_val, (duk_int32_t) code); + } + + duk_err_setup_ljstate1(thr, DUK_LJ_TYPE_THROW, &tv_val); + + /* No augmentation to avoid any allocations or side effects. */ + } else { + /* Prevent infinite recursion. Extra call stack and C + * recursion headroom (see GH-191) is added for augmentation. + * That is now signalled by heap->augmenting error and taken + * into account in call handling without an explicit limit bump. + */ + thr->heap->creating_error = 1; + + duk_require_stack(thr, 1); + + /* XXX: usually unnecessary '%s' formatting here, but cannot + * use 'msg' as a format string directly. + */ +#if defined(DUK_USE_VERBOSE_ERRORS) + duk_push_error_object_raw(thr, + code | DUK_ERRCODE_FLAG_NOBLAME_FILELINE, + filename, + line, + "%s", + (const char *) msg); +#else + duk_push_error_object_raw(thr, + code | DUK_ERRCODE_FLAG_NOBLAME_FILELINE, + NULL, + 0, + NULL); +#endif + + /* Note that an alloc error may happen during error augmentation. + * This may happen both when the original error is an alloc error + * and when it's something else. Because any error in augmentation + * must be handled correctly anyway, there's no special check for + * avoiding it for alloc errors (this differs from Duktape 1.x). + */ +#if defined(DUK_USE_AUGMENT_ERROR_THROW) + DUK_DDD(DUK_DDDPRINT("THROW ERROR (INTERNAL): %!iT (before throw augment)", + (duk_tval *) duk_get_tval(thr, -1))); + duk_err_augment_error_throw(thr); +#endif + + duk_err_setup_ljstate1(thr, DUK_LJ_TYPE_THROW, DUK_GET_TVAL_NEGIDX(thr, -1)); + thr->heap->creating_error = 0; + + /* Error is now created and we assume no errors can occur any + * more. Check for debugger Throw integration only when the + * error is complete. If we enter debugger message loop, + * creating_error must be 0 so that errors can be thrown in + * the paused state, e.g. in Eval commands. + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_err_check_debugger_integration(thr); +#endif + } + + /* + * Finally, longjmp + */ + + DUK_DDD(DUK_DDDPRINT("THROW ERROR (INTERNAL): %!iT, %!iT (after throw augment)", + (duk_tval *) &thr->heap->lj.value1, (duk_tval *) &thr->heap->lj.value2)); + + duk_err_longjmp(thr); + DUK_UNREACHABLE(); +} + +/* + * Helper for C function call negative return values. + */ + +DUK_INTERNAL void duk_error_throw_from_negative_rc(duk_hthread *thr, duk_ret_t rc) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(rc < 0); + + /* + * The __FILE__ and __LINE__ information is intentionally not used in the + * creation of the error object, as it isn't useful in the tracedata. The + * tracedata still contains the function which returned the negative return + * code, and having the file/line of this function isn't very useful. + * + * The error messages for DUK_RET_xxx shorthand are intentionally very + * minimal: they're only really useful for low memory targets. + */ + + duk_error_raw(thr, -rc, NULL, 0, "error (rc %ld)", (long) rc); + DUK_WO_NORETURN(return;); +} +#line 1 "duk_hbuffer_alloc.c" +/* + * duk_hbuffer allocation and freeing. + */ + +/* #include duk_internal.h -> already included */ + +/* Allocate a new duk_hbuffer of a certain type and return a pointer to it + * (NULL on error). Write buffer data pointer to 'out_bufdata' (only if + * allocation successful). + */ +DUK_INTERNAL duk_hbuffer *duk_hbuffer_alloc(duk_heap *heap, duk_size_t size, duk_small_uint_t flags, void **out_bufdata) { + duk_hbuffer *res = NULL; + duk_size_t header_size; + duk_size_t alloc_size; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(out_bufdata != NULL); + + DUK_DDD(DUK_DDDPRINT("allocate hbuffer")); + + /* Size sanity check. Should not be necessary because caller is + * required to check this, but we don't want to cause a segfault + * if the size wraps either in duk_size_t computation or when + * storing the size in a 16-bit field. + */ + if (size > DUK_HBUFFER_MAX_BYTELEN) { + DUK_D(DUK_DPRINT("hbuffer alloc failed: size too large: %ld", (long) size)); + return NULL; /* no need to write 'out_bufdata' */ + } + + if (flags & DUK_BUF_FLAG_EXTERNAL) { + header_size = sizeof(duk_hbuffer_external); + alloc_size = sizeof(duk_hbuffer_external); + } else if (flags & DUK_BUF_FLAG_DYNAMIC) { + header_size = sizeof(duk_hbuffer_dynamic); + alloc_size = sizeof(duk_hbuffer_dynamic); + } else { + header_size = sizeof(duk_hbuffer_fixed); + alloc_size = sizeof(duk_hbuffer_fixed) + size; + DUK_ASSERT(alloc_size >= sizeof(duk_hbuffer_fixed)); /* no wrapping */ + } + + res = (duk_hbuffer *) DUK_ALLOC(heap, alloc_size); + if (DUK_UNLIKELY(res == NULL)) { + goto alloc_error; + } + + /* zero everything unless requested not to do so */ +#if defined(DUK_USE_ZERO_BUFFER_DATA) + duk_memzero((void *) res, + (flags & DUK_BUF_FLAG_NOZERO) ? header_size : alloc_size); +#else + duk_memzero((void *) res, header_size); +#endif + + if (flags & DUK_BUF_FLAG_EXTERNAL) { + duk_hbuffer_external *h; + h = (duk_hbuffer_external *) res; + DUK_UNREF(h); + *out_bufdata = NULL; +#if defined(DUK_USE_EXPLICIT_NULL_INIT) +#if defined(DUK_USE_HEAPPTR16) +/* the compressed pointer is zeroed which maps to NULL, so nothing to do. */ +#else + DUK_HBUFFER_EXTERNAL_SET_DATA_PTR(heap, h, NULL); +#endif +#endif + DUK_ASSERT(DUK_HBUFFER_EXTERNAL_GET_DATA_PTR(heap, h) == NULL); + } else if (flags & DUK_BUF_FLAG_DYNAMIC) { + duk_hbuffer_dynamic *h = (duk_hbuffer_dynamic *) res; + void *ptr; + + if (size > 0) { + DUK_ASSERT(!(flags & DUK_BUF_FLAG_EXTERNAL)); /* alloc external with size zero */ + DUK_DDD(DUK_DDDPRINT("dynamic buffer with nonzero size, alloc actual buffer")); +#if defined(DUK_USE_ZERO_BUFFER_DATA) + ptr = DUK_ALLOC_ZEROED(heap, size); +#else + ptr = DUK_ALLOC(heap, size); +#endif + if (DUK_UNLIKELY(ptr == NULL)) { + /* Because size > 0, NULL check is correct */ + goto alloc_error; + } + *out_bufdata = ptr; + + DUK_HBUFFER_DYNAMIC_SET_DATA_PTR(heap, h, ptr); + } else { + *out_bufdata = NULL; +#if defined(DUK_USE_EXPLICIT_NULL_INIT) +#if defined(DUK_USE_HEAPPTR16) +/* the compressed pointer is zeroed which maps to NULL, so nothing to do. */ +#else + DUK_HBUFFER_DYNAMIC_SET_DATA_PTR(heap, h, NULL); +#endif +#endif + DUK_ASSERT(DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(heap, h) == NULL); + } + } else { + *out_bufdata = (void *) ((duk_hbuffer_fixed *) (void *) res + 1); + } + + DUK_HBUFFER_SET_SIZE(res, size); + + DUK_HEAPHDR_SET_TYPE(&res->hdr, DUK_HTYPE_BUFFER); + if (flags & DUK_BUF_FLAG_DYNAMIC) { + DUK_HBUFFER_SET_DYNAMIC(res); + if (flags & DUK_BUF_FLAG_EXTERNAL) { + DUK_HBUFFER_SET_EXTERNAL(res); + } + } else { + DUK_ASSERT(!(flags & DUK_BUF_FLAG_EXTERNAL)); + } + DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(heap, &res->hdr); + + DUK_DDD(DUK_DDDPRINT("allocated hbuffer: %p", (void *) res)); + return res; + + alloc_error: + DUK_DD(DUK_DDPRINT("hbuffer allocation failed")); + + DUK_FREE(heap, res); + return NULL; /* no need to write 'out_bufdata' */ +} + +/* For indirect allocs. */ + +DUK_INTERNAL void *duk_hbuffer_get_dynalloc_ptr(duk_heap *heap, void *ud) { + duk_hbuffer_dynamic *buf = (duk_hbuffer_dynamic *) ud; + DUK_UNREF(heap); + return (void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(heap, buf); +} +#line 1 "duk_hbuffer_ops.c" +/* + * duk_hbuffer operations such as resizing and inserting/appending data to + * a dynamic buffer. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Resizing + */ + +DUK_INTERNAL void duk_hbuffer_resize(duk_hthread *thr, duk_hbuffer_dynamic *buf, duk_size_t new_size) { + void *res; + duk_size_t prev_size; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(buf != NULL); + DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(buf)); + DUK_ASSERT(!DUK_HBUFFER_HAS_EXTERNAL(buf)); + + /* + * Maximum size check + */ + + if (new_size > DUK_HBUFFER_MAX_BYTELEN) { + DUK_ERROR_RANGE(thr, "buffer too long"); + DUK_WO_NORETURN(return;); + } + + /* + * Note: use indirect realloc variant just in case mark-and-sweep + * (finalizers) might resize this same buffer during garbage + * collection. + */ + + res = DUK_REALLOC_INDIRECT(thr->heap, duk_hbuffer_get_dynalloc_ptr, (void *) buf, new_size); + if (DUK_LIKELY(res != NULL || new_size == 0)) { + /* 'res' may be NULL if new allocation size is 0. */ + + DUK_DDD(DUK_DDDPRINT("resized dynamic buffer %p:%ld -> %p:%ld", + (void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, buf), + (long) DUK_HBUFFER_DYNAMIC_GET_SIZE(buf), + (void *) res, + (long) new_size)); + + /* + * The entire allocated buffer area, regardless of actual used + * size, is kept zeroed in resizes for simplicity. If the buffer + * is grown, zero the new part. + */ + + prev_size = DUK_HBUFFER_DYNAMIC_GET_SIZE(buf); + if (new_size > prev_size) { + DUK_ASSERT(new_size - prev_size > 0); +#if defined(DUK_USE_ZERO_BUFFER_DATA) + duk_memzero((void *) ((char *) res + prev_size), + (duk_size_t) (new_size - prev_size)); +#endif + } + + DUK_HBUFFER_DYNAMIC_SET_SIZE(buf, new_size); + DUK_HBUFFER_DYNAMIC_SET_DATA_PTR(thr->heap, buf, res); + } else { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return;); + } + + DUK_ASSERT(res != NULL || new_size == 0); +} + +DUK_INTERNAL void duk_hbuffer_reset(duk_hthread *thr, duk_hbuffer_dynamic *buf) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(buf != NULL); + DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(buf)); + DUK_ASSERT(!DUK_HBUFFER_HAS_EXTERNAL(buf)); + + duk_hbuffer_resize(thr, buf, 0); +} +/* #include duk_internal.h -> already included */ +#line 2 "duk_hbufobj_misc.c" + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_uint_t duk_hbufobj_clamp_bytelength(duk_hbufobj *h_bufobj, duk_uint_t len) { + duk_uint_t buf_size; + duk_uint_t buf_avail; + + DUK_ASSERT(h_bufobj != NULL); + DUK_ASSERT(h_bufobj->buf != NULL); + + buf_size = (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_bufobj->buf); + if (h_bufobj->offset > buf_size) { + /* Slice starting point is beyond current length. */ + return 0; + } + buf_avail = buf_size - h_bufobj->offset; + + return buf_avail >= len ? len : buf_avail; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ +#line 1 "duk_heap_alloc.c" +/* + * duk_heap allocation and freeing. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_ROM_STRINGS) +/* Fixed seed value used with ROM strings. */ +#define DUK__FIXED_HASH_SEED 0xabcd1234 +#endif + +/* + * Free a heap object. + * + * Free heap object and its internal (non-heap) pointers. Assumes that + * caller has removed the object from heap allocated list or the string + * intern table, and any weak references (which strings may have) have + * been already dealt with. + */ + +DUK_INTERNAL void duk_free_hobject(duk_heap *heap, duk_hobject *h) { + DUK_ASSERT(heap != NULL); + DUK_ASSERT(h != NULL); + + DUK_FREE(heap, DUK_HOBJECT_GET_PROPS(heap, h)); + + if (DUK_HOBJECT_IS_COMPFUNC(h)) { + duk_hcompfunc *f = (duk_hcompfunc *) h; + DUK_UNREF(f); + /* Currently nothing to free; 'data' is a heap object */ + } else if (DUK_HOBJECT_IS_NATFUNC(h)) { + duk_hnatfunc *f = (duk_hnatfunc *) h; + DUK_UNREF(f); + /* Currently nothing to free */ + } else if (DUK_HOBJECT_IS_THREAD(h)) { + duk_hthread *t = (duk_hthread *) h; + duk_activation *act; + + DUK_FREE(heap, t->valstack); + + /* Don't free h->resumer because it exists in the heap. + * Callstack entries also contain function pointers which + * are not freed for the same reason. They are decref + * finalized and the targets are freed if necessary based + * on their refcount (or reachability). + */ + for (act = t->callstack_curr; act != NULL;) { + duk_activation *act_next; + duk_catcher *cat; + + for (cat = act->cat; cat != NULL;) { + duk_catcher *cat_next; + + cat_next = cat->parent; + DUK_FREE(heap, (void *) cat); + cat = cat_next; + } + + act_next = act->parent; + DUK_FREE(heap, (void *) act); + act = act_next; + } + + /* XXX: with 'caller' property the callstack would need + * to be unwound to update the 'caller' properties of + * functions in the callstack. + */ + } else if (DUK_HOBJECT_IS_BOUNDFUNC(h)) { + duk_hboundfunc *f = (duk_hboundfunc *) (void *) h; + + DUK_FREE(heap, f->args); + } + + DUK_FREE(heap, (void *) h); +} + +DUK_INTERNAL void duk_free_hbuffer(duk_heap *heap, duk_hbuffer *h) { + DUK_ASSERT(heap != NULL); + DUK_ASSERT(h != NULL); + + if (DUK_HBUFFER_HAS_DYNAMIC(h) && !DUK_HBUFFER_HAS_EXTERNAL(h)) { + duk_hbuffer_dynamic *g = (duk_hbuffer_dynamic *) h; + DUK_DDD(DUK_DDDPRINT("free dynamic buffer %p", (void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(heap, g))); + DUK_FREE(heap, DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(heap, g)); + } + DUK_FREE(heap, (void *) h); +} + +DUK_INTERNAL void duk_free_hstring(duk_heap *heap, duk_hstring *h) { + DUK_ASSERT(heap != NULL); + DUK_ASSERT(h != NULL); + + DUK_UNREF(heap); + DUK_UNREF(h); + +#if defined(DUK_USE_HSTRING_EXTDATA) && defined(DUK_USE_EXTSTR_FREE) + if (DUK_HSTRING_HAS_EXTDATA(h)) { + DUK_DDD(DUK_DDDPRINT("free extstr: hstring %!O, extdata: %p", + h, DUK_HSTRING_GET_EXTDATA((duk_hstring_external *) h))); + DUK_USE_EXTSTR_FREE(heap->heap_udata, (const void *) DUK_HSTRING_GET_EXTDATA((duk_hstring_external *) h)); + } +#endif + DUK_FREE(heap, (void *) h); +} + +DUK_INTERNAL void duk_heap_free_heaphdr_raw(duk_heap *heap, duk_heaphdr *hdr) { + DUK_ASSERT(heap); + DUK_ASSERT(hdr); + + DUK_DDD(DUK_DDDPRINT("free heaphdr %p, htype %ld", (void *) hdr, (long) DUK_HEAPHDR_GET_TYPE(hdr))); + + switch (DUK_HEAPHDR_GET_TYPE(hdr)) { + case DUK_HTYPE_STRING: + duk_free_hstring(heap, (duk_hstring *) hdr); + break; + case DUK_HTYPE_OBJECT: + duk_free_hobject(heap, (duk_hobject *) hdr); + break; + default: + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(hdr) == DUK_HTYPE_BUFFER); + duk_free_hbuffer(heap, (duk_hbuffer *) hdr); + } + +} + +/* + * Free the heap. + * + * Frees heap-related non-heap-tracked allocations such as the + * string intern table; then frees the heap allocated objects; + * and finally frees the heap structure itself. Reference counts + * and GC markers are ignored (and not updated) in this process, + * and finalizers won't be called. + * + * The heap pointer and heap object pointers must not be used + * after this call. + */ + +#if defined(DUK_USE_CACHE_ACTIVATION) +DUK_LOCAL duk_size_t duk__heap_free_activation_freelist(duk_heap *heap) { + duk_activation *act; + duk_activation *act_next; + duk_size_t count_act = 0; + + for (act = heap->activation_free; act != NULL;) { + act_next = act->parent; + DUK_FREE(heap, (void *) act); + act = act_next; +#if defined(DUK_USE_DEBUG) + count_act++; +#endif + } + heap->activation_free = NULL; /* needed when called from mark-and-sweep */ + return count_act; +} +#endif /* DUK_USE_CACHE_ACTIVATION */ + +#if defined(DUK_USE_CACHE_CATCHER) +DUK_LOCAL duk_size_t duk__heap_free_catcher_freelist(duk_heap *heap) { + duk_catcher *cat; + duk_catcher *cat_next; + duk_size_t count_cat = 0; + + for (cat = heap->catcher_free; cat != NULL;) { + cat_next = cat->parent; + DUK_FREE(heap, (void *) cat); + cat = cat_next; +#if defined(DUK_USE_DEBUG) + count_cat++; +#endif + } + heap->catcher_free = NULL; /* needed when called from mark-and-sweep */ + + return count_cat; +} +#endif /* DUK_USE_CACHE_CATCHER */ + +DUK_INTERNAL void duk_heap_free_freelists(duk_heap *heap) { + duk_size_t count_act = 0; + duk_size_t count_cat = 0; + +#if defined(DUK_USE_CACHE_ACTIVATION) + count_act = duk__heap_free_activation_freelist(heap); +#endif +#if defined(DUK_USE_CACHE_CATCHER) + count_cat = duk__heap_free_catcher_freelist(heap); +#endif + DUK_UNREF(heap); + DUK_UNREF(count_act); + DUK_UNREF(count_cat); + + DUK_D(DUK_DPRINT("freed %ld activation freelist entries, %ld catcher freelist entries", + (long) count_act, (long) count_cat)); +} + +DUK_LOCAL void duk__free_allocated(duk_heap *heap) { + duk_heaphdr *curr; + duk_heaphdr *next; + + curr = heap->heap_allocated; + while (curr) { + /* We don't log or warn about freeing zero refcount objects + * because they may happen with finalizer processing. + */ + + DUK_DDD(DUK_DDDPRINT("FINALFREE (allocated): %!iO", + (duk_heaphdr *) curr)); + next = DUK_HEAPHDR_GET_NEXT(heap, curr); + duk_heap_free_heaphdr_raw(heap, curr); + curr = next; + } +} + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_LOCAL void duk__free_finalize_list(duk_heap *heap) { + duk_heaphdr *curr; + duk_heaphdr *next; + + curr = heap->finalize_list; + while (curr) { + DUK_DDD(DUK_DDDPRINT("FINALFREE (finalize_list): %!iO", + (duk_heaphdr *) curr)); + next = DUK_HEAPHDR_GET_NEXT(heap, curr); + duk_heap_free_heaphdr_raw(heap, curr); + curr = next; + } +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +DUK_LOCAL void duk__free_stringtable(duk_heap *heap) { + /* strings are only tracked by stringtable */ + duk_heap_strtable_free(heap); +} + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_LOCAL void duk__free_run_finalizers(duk_heap *heap) { + duk_heaphdr *curr; + duk_uint_t round_no; + duk_size_t count_all; + duk_size_t count_finalized; + duk_size_t curr_limit; + + DUK_ASSERT(heap != NULL); + +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* refzero not running -> must be empty */ +#endif + DUK_ASSERT(heap->finalize_list == NULL); /* mark-and-sweep last pass */ + + if (heap->heap_thread == NULL) { + /* May happen when heap allocation fails right off. There + * cannot be any finalizable objects in this case. + */ + DUK_D(DUK_DPRINT("no heap_thread in heap destruct, assume no finalizable objects")); + return; + } + + /* Prevent finalize_list processing and mark-and-sweep entirely. + * Setting ms_running = 1 also prevents refzero handling from moving + * objects away from the heap_allocated list (the flag name is a bit + * misleading here). + */ + DUK_ASSERT(heap->pf_prevent_count == 0); + heap->pf_prevent_count = 1; + DUK_ASSERT(heap->ms_running == 0); + heap->ms_running = 1; + DUK_ASSERT(heap->ms_prevent_count == 0); + heap->ms_prevent_count = 1; /* Bump, because mark-and-sweep assumes it's bumped when ms_running is set. */ + + curr_limit = 0; /* suppress warning, not used */ + for (round_no = 0; ; round_no++) { + curr = heap->heap_allocated; + count_all = 0; + count_finalized = 0; + while (curr) { + count_all++; + if (DUK_HEAPHDR_IS_OBJECT(curr)) { + /* Only objects in heap_allocated may have finalizers. Check that + * the object itself has a _Finalizer property (own or inherited) + * so that we don't execute finalizers for e.g. Proxy objects. + */ + DUK_ASSERT(curr != NULL); + + if (DUK_HOBJECT_HAS_FINALIZER_FAST(heap, (duk_hobject *) curr)) { + if (!DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) curr)) { + DUK_ASSERT(DUK_HEAP_HAS_FINALIZER_NORESCUE(heap)); /* maps to finalizer 2nd argument */ + duk_heap_run_finalizer(heap, (duk_hobject *) curr); + count_finalized++; + } + } + } + curr = DUK_HEAPHDR_GET_NEXT(heap, curr); + } + + /* Each round of finalizer execution may spawn new finalizable objects + * which is normal behavior for some applications. Allow multiple + * rounds of finalization, but use a shrinking limit based on the + * first round to detect the case where a runaway finalizer creates + * an unbounded amount of new finalizable objects. Finalizer rescue + * is not supported: the semantics are unclear because most of the + * objects being finalized here are already reachable. The finalizer + * is given a boolean to indicate that rescue is not possible. + * + * See discussion in: https://github.com/svaarala/duktape/pull/473 + */ + + if (round_no == 0) { + /* Cannot wrap: each object is at least 8 bytes so count is + * at most 1/8 of that. + */ + curr_limit = count_all * 2; + } else { + curr_limit = (curr_limit * 3) / 4; /* Decrease by 25% every round */ + } + DUK_D(DUK_DPRINT("finalizer round %ld complete, %ld objects, tried to execute %ld finalizers, current limit is %ld", + (long) round_no, (long) count_all, (long) count_finalized, (long) curr_limit)); + + if (count_finalized == 0) { + DUK_D(DUK_DPRINT("no more finalizable objects, forced finalization finished")); + break; + } + if (count_finalized >= curr_limit) { + DUK_D(DUK_DPRINT("finalizer count above limit, potentially runaway finalizer; skip remaining finalizers")); + break; + } + } + + DUK_ASSERT(heap->ms_running == 1); + heap->ms_running = 0; + DUK_ASSERT(heap->pf_prevent_count == 1); + heap->pf_prevent_count = 0; +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +DUK_INTERNAL void duk_heap_free(duk_heap *heap) { + DUK_D(DUK_DPRINT("free heap: %p", (void *) heap)); + +#if defined(DUK_USE_DEBUG) + duk_heap_strtable_dump(heap); +#endif + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + /* Detach a debugger if attached (can be called multiple times) + * safely. + */ + /* XXX: Add a flag to reject an attempt to re-attach? Otherwise + * the detached callback may immediately reattach. + */ + duk_debug_do_detach(heap); +#endif + + /* Execute finalizers before freeing the heap, even for reachable + * objects. This gives finalizers the chance to free any native + * resources like file handles, allocations made outside Duktape, + * etc. This is quite tricky to get right, so that all finalizer + * guarantees are honored. + * + * Run mark-and-sweep a few times just in case (unreachable object + * finalizers run already here). The last round must rescue objects + * from the previous round without running any more finalizers. This + * ensures rescued objects get their FINALIZED flag cleared so that + * their finalizer is called once more in forced finalization to + * satisfy finalizer guarantees. However, we don't want to run any + * more finalizers because that'd required one more loop, and so on. + * + * XXX: this perhaps requires an execution time limit. + */ + DUK_D(DUK_DPRINT("execute finalizers before freeing heap")); + DUK_ASSERT(heap->pf_skip_finalizers == 0); + DUK_D(DUK_DPRINT("forced gc #1 in heap destruction")); + duk_heap_mark_and_sweep(heap, 0); + DUK_D(DUK_DPRINT("forced gc #2 in heap destruction")); + duk_heap_mark_and_sweep(heap, 0); + DUK_D(DUK_DPRINT("forced gc #3 in heap destruction (don't run finalizers)")); + heap->pf_skip_finalizers = 1; + duk_heap_mark_and_sweep(heap, 0); /* Skip finalizers; queue finalizable objects to heap_allocated. */ + + /* There are never objects in refzero_list at this point, or at any + * point beyond a DECREF (even a DECREF_NORZ). Since Duktape 2.1 + * refzero_list processing is side effect free, so it is always + * processed to completion by a DECREF initially triggering a zero + * refcount. + */ +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* Always processed to completion inline. */ +#endif +#if defined(DUK_USE_FINALIZER_SUPPORT) + DUK_ASSERT(heap->finalize_list == NULL); /* Last mark-and-sweep with skip_finalizers. */ +#endif + +#if defined(DUK_USE_FINALIZER_SUPPORT) + DUK_D(DUK_DPRINT("run finalizers for remaining finalizable objects")); + DUK_HEAP_SET_FINALIZER_NORESCUE(heap); /* Rescue no longer supported. */ + duk__free_run_finalizers(heap); +#endif /* DUK_USE_FINALIZER_SUPPORT */ + + /* Note: heap->heap_thread, heap->curr_thread, and heap->heap_object + * are on the heap allocated list. + */ + + DUK_D(DUK_DPRINT("freeing temporary freelists")); + duk_heap_free_freelists(heap); + + DUK_D(DUK_DPRINT("freeing heap_allocated of heap: %p", (void *) heap)); + duk__free_allocated(heap); + +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* Always processed to completion inline. */ +#endif + +#if defined(DUK_USE_FINALIZER_SUPPORT) + DUK_D(DUK_DPRINT("freeing finalize_list of heap: %p", (void *) heap)); + duk__free_finalize_list(heap); +#endif + + DUK_D(DUK_DPRINT("freeing string table of heap: %p", (void *) heap)); + duk__free_stringtable(heap); + + DUK_D(DUK_DPRINT("freeing heap structure: %p", (void *) heap)); + heap->free_func(heap->heap_udata, heap); +} + +/* + * Allocate a heap. + * + * String table is initialized with built-in strings from genbuiltins.py, + * either by dynamically creating the strings or by referring to ROM strings. + */ + +#if defined(DUK_USE_ROM_STRINGS) +DUK_LOCAL duk_bool_t duk__init_heap_strings(duk_heap *heap) { +#if defined(DUK_USE_ASSERTIONS) + duk_small_uint_t i; +#endif + + DUK_UNREF(heap); + + /* With ROM-based strings, heap->strs[] and thr->strs[] are omitted + * so nothing to initialize for strs[]. + */ + +#if defined(DUK_USE_ASSERTIONS) + for (i = 0; i < sizeof(duk_rom_strings_lookup) / sizeof(const duk_hstring *); i++) { + const duk_hstring *h; + duk_uint32_t hash; + + h = duk_rom_strings_lookup[i]; + while (h != NULL) { + hash = duk_heap_hashstring(heap, (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); + DUK_DD(DUK_DDPRINT("duk_rom_strings_lookup[%d] -> hash 0x%08lx, computed 0x%08lx", + (int) i, (unsigned long) DUK_HSTRING_GET_HASH(h), (unsigned long) hash)); + DUK_ASSERT(hash == (duk_uint32_t) DUK_HSTRING_GET_HASH(h)); + + h = (const duk_hstring *) h->hdr.h_next; + } + } +#endif + return 1; +} +#else /* DUK_USE_ROM_STRINGS */ + +DUK_LOCAL duk_bool_t duk__init_heap_strings(duk_heap *heap) { + duk_bitdecoder_ctx bd_ctx; + duk_bitdecoder_ctx *bd = &bd_ctx; /* convenience */ + duk_small_uint_t i; + + duk_memzero(&bd_ctx, sizeof(bd_ctx)); + bd->data = (const duk_uint8_t *) duk_strings_data; + bd->length = (duk_size_t) DUK_STRDATA_DATA_LENGTH; + + for (i = 0; i < DUK_HEAP_NUM_STRINGS; i++) { + duk_uint8_t tmp[DUK_STRDATA_MAX_STRLEN]; + duk_small_uint_t len; + duk_hstring *h; + + len = duk_bd_decode_bitpacked_string(bd, tmp); + + /* No need to length check string: it will never exceed even + * the 16-bit length maximum. + */ + DUK_ASSERT(len <= 0xffffUL); + DUK_DDD(DUK_DDDPRINT("intern built-in string %ld", (long) i)); + h = duk_heap_strtable_intern(heap, tmp, len); + if (!h) { + goto failed; + } + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)); + + /* Special flags checks. Since these strings are always + * reachable and a string cannot appear twice in the string + * table, there's no need to check/set these flags elsewhere. + * The 'internal' flag is set by string intern code. + */ + if (i == DUK_STRIDX_EVAL || i == DUK_STRIDX_LC_ARGUMENTS) { + DUK_HSTRING_SET_EVAL_OR_ARGUMENTS(h); + } + if (i >= DUK_STRIDX_START_RESERVED && i < DUK_STRIDX_END_RESERVED) { + DUK_HSTRING_SET_RESERVED_WORD(h); + if (i >= DUK_STRIDX_START_STRICT_RESERVED) { + DUK_HSTRING_SET_STRICT_RESERVED_WORD(h); + } + } + + DUK_DDD(DUK_DDDPRINT("interned: %!O", (duk_heaphdr *) h)); + + /* XXX: The incref macro takes a thread pointer but doesn't + * use it right now. + */ + DUK_HSTRING_INCREF(_never_referenced_, h); + +#if defined(DUK_USE_HEAPPTR16) + heap->strs16[i] = DUK_USE_HEAPPTR_ENC16(heap->heap_udata, (void *) h); +#else + heap->strs[i] = h; +#endif + } + + return 1; + + failed: + return 0; +} +#endif /* DUK_USE_ROM_STRINGS */ + +DUK_LOCAL duk_bool_t duk__init_heap_thread(duk_heap *heap) { + duk_hthread *thr; + + DUK_D(DUK_DPRINT("heap init: alloc heap thread")); + thr = duk_hthread_alloc_unchecked(heap, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_THREAD)); + if (thr == NULL) { + DUK_D(DUK_DPRINT("failed to alloc heap_thread")); + return 0; + } + thr->state = DUK_HTHREAD_STATE_INACTIVE; +#if defined(DUK_USE_ROM_STRINGS) + /* No strs[] pointer. */ +#else /* DUK_USE_ROM_STRINGS */ +#if defined(DUK_USE_HEAPPTR16) + thr->strs16 = heap->strs16; +#else + thr->strs = heap->strs; +#endif +#endif /* DUK_USE_ROM_STRINGS */ + + heap->heap_thread = thr; + DUK_HTHREAD_INCREF(thr, thr); /* Note: first argument not really used */ + + /* 'thr' is now reachable */ + + DUK_D(DUK_DPRINT("heap init: init heap thread stacks")); + if (!duk_hthread_init_stacks(heap, thr)) { + return 0; + } + + /* XXX: this may now fail, and is not handled correctly */ + duk_hthread_create_builtin_objects(thr); + + /* default prototype */ + DUK_HOBJECT_SET_PROTOTYPE_INIT_INCREF(thr, (duk_hobject *) thr, thr->builtins[DUK_BIDX_THREAD_PROTOTYPE]); + + return 1; +} + +#if defined(DUK_USE_DEBUG) +#define DUK__DUMPSZ(t) do { \ + DUK_D(DUK_DPRINT("" #t "=%ld", (long) sizeof(t))); \ + } while (0) + +/* These is not 100% because format would need to be non-portable "long long". + * Also print out as doubles to catch cases where the "long" type is not wide + * enough; the limits will then not be printed accurately but the magnitude + * will be correct. + */ +#define DUK__DUMPLM_SIGNED_RAW(t,a,b) do { \ + DUK_D(DUK_DPRINT(t "=[%ld,%ld]=[%lf,%lf]", \ + (long) (a), (long) (b), \ + (double) (a), (double) (b))); \ + } while (0) +#define DUK__DUMPLM_UNSIGNED_RAW(t,a,b) do { \ + DUK_D(DUK_DPRINT(t "=[%lu,%lu]=[%lf,%lf]", \ + (unsigned long) (a), (unsigned long) (b), \ + (double) (a), (double) (b))); \ + } while (0) +#define DUK__DUMPLM_SIGNED(t) do { \ + DUK__DUMPLM_SIGNED_RAW("DUK_" #t "_{MIN,MAX}", DUK_##t##_MIN, DUK_##t##_MAX); \ + } while (0) +#define DUK__DUMPLM_UNSIGNED(t) do { \ + DUK__DUMPLM_UNSIGNED_RAW("DUK_" #t "_{MIN,MAX}", DUK_##t##_MIN, DUK_##t##_MAX); \ + } while (0) + +DUK_LOCAL void duk__dump_type_sizes(void) { + DUK_D(DUK_DPRINT("sizeof()")); + + /* basic platform types */ + DUK__DUMPSZ(char); + DUK__DUMPSZ(short); + DUK__DUMPSZ(int); + DUK__DUMPSZ(long); + DUK__DUMPSZ(double); + DUK__DUMPSZ(void *); + DUK__DUMPSZ(size_t); + + /* basic types from duk_features.h */ + DUK__DUMPSZ(duk_uint8_t); + DUK__DUMPSZ(duk_int8_t); + DUK__DUMPSZ(duk_uint16_t); + DUK__DUMPSZ(duk_int16_t); + DUK__DUMPSZ(duk_uint32_t); + DUK__DUMPSZ(duk_int32_t); + DUK__DUMPSZ(duk_uint64_t); + DUK__DUMPSZ(duk_int64_t); + DUK__DUMPSZ(duk_uint_least8_t); + DUK__DUMPSZ(duk_int_least8_t); + DUK__DUMPSZ(duk_uint_least16_t); + DUK__DUMPSZ(duk_int_least16_t); + DUK__DUMPSZ(duk_uint_least32_t); + DUK__DUMPSZ(duk_int_least32_t); +#if defined(DUK_USE_64BIT_OPS) + DUK__DUMPSZ(duk_uint_least64_t); + DUK__DUMPSZ(duk_int_least64_t); +#endif + DUK__DUMPSZ(duk_uint_fast8_t); + DUK__DUMPSZ(duk_int_fast8_t); + DUK__DUMPSZ(duk_uint_fast16_t); + DUK__DUMPSZ(duk_int_fast16_t); + DUK__DUMPSZ(duk_uint_fast32_t); + DUK__DUMPSZ(duk_int_fast32_t); +#if defined(DUK_USE_64BIT_OPS) + DUK__DUMPSZ(duk_uint_fast64_t); + DUK__DUMPSZ(duk_int_fast64_t); +#endif + DUK__DUMPSZ(duk_uintptr_t); + DUK__DUMPSZ(duk_intptr_t); + DUK__DUMPSZ(duk_uintmax_t); + DUK__DUMPSZ(duk_intmax_t); + DUK__DUMPSZ(duk_double_t); + + /* important chosen base types */ + DUK__DUMPSZ(duk_int_t); + DUK__DUMPSZ(duk_uint_t); + DUK__DUMPSZ(duk_int_fast_t); + DUK__DUMPSZ(duk_uint_fast_t); + DUK__DUMPSZ(duk_small_int_t); + DUK__DUMPSZ(duk_small_uint_t); + DUK__DUMPSZ(duk_small_int_fast_t); + DUK__DUMPSZ(duk_small_uint_fast_t); + + /* some derived types */ + DUK__DUMPSZ(duk_codepoint_t); + DUK__DUMPSZ(duk_ucodepoint_t); + DUK__DUMPSZ(duk_idx_t); + DUK__DUMPSZ(duk_errcode_t); + DUK__DUMPSZ(duk_uarridx_t); + + /* tval */ + DUK__DUMPSZ(duk_double_union); + DUK__DUMPSZ(duk_tval); + + /* structs from duk_forwdecl.h */ + DUK__DUMPSZ(duk_jmpbuf); /* just one 'int' for C++ exceptions */ + DUK__DUMPSZ(duk_heaphdr); + DUK__DUMPSZ(duk_heaphdr_string); + DUK__DUMPSZ(duk_hstring); + DUK__DUMPSZ(duk_hstring_external); + DUK__DUMPSZ(duk_hobject); + DUK__DUMPSZ(duk_harray); + DUK__DUMPSZ(duk_hcompfunc); + DUK__DUMPSZ(duk_hnatfunc); + DUK__DUMPSZ(duk_hdecenv); + DUK__DUMPSZ(duk_hobjenv); + DUK__DUMPSZ(duk_hthread); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + DUK__DUMPSZ(duk_hbufobj); +#endif + DUK__DUMPSZ(duk_hproxy); + DUK__DUMPSZ(duk_hbuffer); + DUK__DUMPSZ(duk_hbuffer_fixed); + DUK__DUMPSZ(duk_hbuffer_dynamic); + DUK__DUMPSZ(duk_hbuffer_external); + DUK__DUMPSZ(duk_propaccessor); + DUK__DUMPSZ(duk_propvalue); + DUK__DUMPSZ(duk_propdesc); + DUK__DUMPSZ(duk_heap); + DUK__DUMPSZ(duk_activation); + DUK__DUMPSZ(duk_catcher); + DUK__DUMPSZ(duk_strcache_entry); + DUK__DUMPSZ(duk_litcache_entry); + DUK__DUMPSZ(duk_ljstate); + DUK__DUMPSZ(duk_fixedbuffer); + DUK__DUMPSZ(duk_bitdecoder_ctx); + DUK__DUMPSZ(duk_bitencoder_ctx); + DUK__DUMPSZ(duk_token); + DUK__DUMPSZ(duk_re_token); + DUK__DUMPSZ(duk_lexer_point); + DUK__DUMPSZ(duk_lexer_ctx); + DUK__DUMPSZ(duk_compiler_instr); + DUK__DUMPSZ(duk_compiler_func); + DUK__DUMPSZ(duk_compiler_ctx); + DUK__DUMPSZ(duk_re_matcher_ctx); + DUK__DUMPSZ(duk_re_compiler_ctx); +} +DUK_LOCAL void duk__dump_type_limits(void) { + DUK_D(DUK_DPRINT("limits")); + + /* basic types */ + DUK__DUMPLM_SIGNED(INT8); + DUK__DUMPLM_UNSIGNED(UINT8); + DUK__DUMPLM_SIGNED(INT_FAST8); + DUK__DUMPLM_UNSIGNED(UINT_FAST8); + DUK__DUMPLM_SIGNED(INT_LEAST8); + DUK__DUMPLM_UNSIGNED(UINT_LEAST8); + DUK__DUMPLM_SIGNED(INT16); + DUK__DUMPLM_UNSIGNED(UINT16); + DUK__DUMPLM_SIGNED(INT_FAST16); + DUK__DUMPLM_UNSIGNED(UINT_FAST16); + DUK__DUMPLM_SIGNED(INT_LEAST16); + DUK__DUMPLM_UNSIGNED(UINT_LEAST16); + DUK__DUMPLM_SIGNED(INT32); + DUK__DUMPLM_UNSIGNED(UINT32); + DUK__DUMPLM_SIGNED(INT_FAST32); + DUK__DUMPLM_UNSIGNED(UINT_FAST32); + DUK__DUMPLM_SIGNED(INT_LEAST32); + DUK__DUMPLM_UNSIGNED(UINT_LEAST32); +#if defined(DUK_USE_64BIT_OPS) + DUK__DUMPLM_SIGNED(INT64); + DUK__DUMPLM_UNSIGNED(UINT64); + DUK__DUMPLM_SIGNED(INT_FAST64); + DUK__DUMPLM_UNSIGNED(UINT_FAST64); + DUK__DUMPLM_SIGNED(INT_LEAST64); + DUK__DUMPLM_UNSIGNED(UINT_LEAST64); +#endif + DUK__DUMPLM_SIGNED(INTPTR); + DUK__DUMPLM_UNSIGNED(UINTPTR); + DUK__DUMPLM_SIGNED(INTMAX); + DUK__DUMPLM_UNSIGNED(UINTMAX); + + /* derived types */ + DUK__DUMPLM_SIGNED(INT); + DUK__DUMPLM_UNSIGNED(UINT); + DUK__DUMPLM_SIGNED(INT_FAST); + DUK__DUMPLM_UNSIGNED(UINT_FAST); + DUK__DUMPLM_SIGNED(SMALL_INT); + DUK__DUMPLM_UNSIGNED(SMALL_UINT); + DUK__DUMPLM_SIGNED(SMALL_INT_FAST); + DUK__DUMPLM_UNSIGNED(SMALL_UINT_FAST); +} + +DUK_LOCAL void duk__dump_misc_options(void) { + DUK_D(DUK_DPRINT("DUK_VERSION: %ld", (long) DUK_VERSION)); + DUK_D(DUK_DPRINT("DUK_GIT_DESCRIBE: %s", DUK_GIT_DESCRIBE)); + DUK_D(DUK_DPRINT("OS string: %s", DUK_USE_OS_STRING)); + DUK_D(DUK_DPRINT("architecture string: %s", DUK_USE_ARCH_STRING)); + DUK_D(DUK_DPRINT("compiler string: %s", DUK_USE_COMPILER_STRING)); + DUK_D(DUK_DPRINT("debug level: %ld", (long) DUK_USE_DEBUG_LEVEL)); +#if defined(DUK_USE_PACKED_TVAL) + DUK_D(DUK_DPRINT("DUK_USE_PACKED_TVAL: yes")); +#else + DUK_D(DUK_DPRINT("DUK_USE_PACKED_TVAL: no")); +#endif +#if defined(DUK_USE_VARIADIC_MACROS) + DUK_D(DUK_DPRINT("DUK_USE_VARIADIC_MACROS: yes")); +#else + DUK_D(DUK_DPRINT("DUK_USE_VARIADIC_MACROS: no")); +#endif +#if defined(DUK_USE_INTEGER_LE) + DUK_D(DUK_DPRINT("integer endianness: little")); +#elif defined(DUK_USE_INTEGER_ME) + DUK_D(DUK_DPRINT("integer endianness: mixed")); +#elif defined(DUK_USE_INTEGER_BE) + DUK_D(DUK_DPRINT("integer endianness: big")); +#else + DUK_D(DUK_DPRINT("integer endianness: ???")); +#endif +#if defined(DUK_USE_DOUBLE_LE) + DUK_D(DUK_DPRINT("IEEE double endianness: little")); +#elif defined(DUK_USE_DOUBLE_ME) + DUK_D(DUK_DPRINT("IEEE double endianness: mixed")); +#elif defined(DUK_USE_DOUBLE_BE) + DUK_D(DUK_DPRINT("IEEE double endianness: big")); +#else + DUK_D(DUK_DPRINT("IEEE double endianness: ???")); +#endif +} +#endif /* DUK_USE_DEBUG */ + +DUK_INTERNAL +duk_heap *duk_heap_alloc(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *heap_udata, + duk_fatal_function fatal_func) { + duk_heap *res = NULL; + duk_uint32_t st_initsize; + + DUK_D(DUK_DPRINT("allocate heap")); + + /* + * Random config sanity asserts + */ + + DUK_ASSERT(DUK_USE_STRTAB_MINSIZE >= 64); + + DUK_ASSERT((DUK_HTYPE_STRING & 0x01U) == 0); + DUK_ASSERT((DUK_HTYPE_BUFFER & 0x01U) == 0); + DUK_ASSERT((DUK_HTYPE_OBJECT & 0x01U) == 1); /* DUK_HEAPHDR_IS_OBJECT() relies ont his. */ + + /* + * Debug dump type sizes + */ + +#if defined(DUK_USE_DEBUG) + duk__dump_misc_options(); + duk__dump_type_sizes(); + duk__dump_type_limits(); +#endif + + /* + * If selftests enabled, run them as early as possible. + */ + +#if defined(DUK_USE_SELF_TESTS) + DUK_D(DUK_DPRINT("run self tests")); + if (duk_selftest_run_tests(alloc_func, realloc_func, free_func, heap_udata) > 0) { + fatal_func(heap_udata, "self test(s) failed"); + } + DUK_D(DUK_DPRINT("self tests passed")); +#endif + + /* + * Important assert-like checks that should be enabled even + * when assertions are otherwise not enabled. + */ + +#if defined(DUK_USE_EXEC_REGCONST_OPTIMIZE) + /* Can't check sizeof() using preprocessor so explicit check. + * This will be optimized away in practice; unfortunately a + * warning is generated on some compilers as a result. + */ +#if defined(DUK_USE_PACKED_TVAL) + if (sizeof(duk_tval) != 8) { +#else + if (sizeof(duk_tval) != 16) { +#endif + fatal_func(heap_udata, "sizeof(duk_tval) not 8 or 16, cannot use DUK_USE_EXEC_REGCONST_OPTIMIZE option"); + } +#endif /* DUK_USE_EXEC_REGCONST_OPTIMIZE */ + + /* + * Computed values (e.g. INFINITY) + */ + +#if defined(DUK_USE_COMPUTED_NAN) + do { + /* Workaround for some exotic platforms where NAN is missing + * and the expression (0.0 / 0.0) does NOT result in a NaN. + * Such platforms use the global 'duk_computed_nan' which must + * be initialized at runtime. Use 'volatile' to ensure that + * the compiler will actually do the computation and not try + * to do constant folding which might result in the original + * problem. + */ + volatile double dbl1 = 0.0; + volatile double dbl2 = 0.0; + duk_computed_nan = dbl1 / dbl2; + } while (0); +#endif + +#if defined(DUK_USE_COMPUTED_INFINITY) + do { + /* Similar workaround for INFINITY. */ + volatile double dbl1 = 1.0; + volatile double dbl2 = 0.0; + duk_computed_infinity = dbl1 / dbl2; + } while (0); +#endif + + /* + * Allocate heap struct + * + * Use a raw call, all macros expect the heap to be initialized + */ + +#if defined(DUK_USE_INJECT_HEAP_ALLOC_ERROR) && (DUK_USE_INJECT_HEAP_ALLOC_ERROR == 1) + goto failed; +#endif + DUK_D(DUK_DPRINT("alloc duk_heap object")); + res = (duk_heap *) alloc_func(heap_udata, sizeof(duk_heap)); + if (!res) { + goto failed; + } + + /* + * Zero the struct, and start initializing roughly in order + */ + + duk_memzero(res, sizeof(*res)); +#if defined(DUK_USE_ASSERTIONS) + res->heap_initializing = 1; +#endif + + /* explicit NULL inits */ +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->heap_udata = NULL; + res->heap_allocated = NULL; +#if defined(DUK_USE_REFERENCE_COUNTING) + res->refzero_list = NULL; +#endif +#if defined(DUK_USE_FINALIZER_SUPPORT) + res->finalize_list = NULL; +#if defined(DUK_USE_ASSERTIONS) + res->currently_finalizing = NULL; +#endif +#endif +#if defined(DUK_USE_CACHE_ACTIVATION) + res->activation_free = NULL; +#endif +#if defined(DUK_USE_CACHE_CATCHER) + res->catcher_free = NULL; +#endif + res->heap_thread = NULL; + res->curr_thread = NULL; + res->heap_object = NULL; +#if defined(DUK_USE_STRTAB_PTRCOMP) + res->strtable16 = NULL; +#else + res->strtable = NULL; +#endif +#if defined(DUK_USE_ROM_STRINGS) + /* no res->strs[] */ +#else /* DUK_USE_ROM_STRINGS */ +#if defined(DUK_USE_HEAPPTR16) + /* res->strs16[] is zeroed and zero decodes to NULL, so no NULL inits. */ +#else + { + duk_small_uint_t i; + for (i = 0; i < DUK_HEAP_NUM_STRINGS; i++) { + res->strs[i] = NULL; + } + } +#endif +#endif /* DUK_USE_ROM_STRINGS */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + res->dbg_read_cb = NULL; + res->dbg_write_cb = NULL; + res->dbg_peek_cb = NULL; + res->dbg_read_flush_cb = NULL; + res->dbg_write_flush_cb = NULL; + res->dbg_request_cb = NULL; + res->dbg_udata = NULL; + res->dbg_pause_act = NULL; +#endif +#endif /* DUK_USE_EXPLICIT_NULL_INIT */ + + res->alloc_func = alloc_func; + res->realloc_func = realloc_func; + res->free_func = free_func; + res->heap_udata = heap_udata; + res->fatal_func = fatal_func; + + /* XXX: for now there's a pointer packing zero assumption, i.e. + * NULL <=> compressed pointer 0. If this is removed, may need + * to precompute e.g. null16 here. + */ + + /* res->ms_trigger_counter == 0 -> now causes immediate GC; which is OK */ + + /* Prevent mark-and-sweep and finalizer execution until heap is completely + * initialized. + */ + DUK_ASSERT(res->ms_prevent_count == 0); + DUK_ASSERT(res->pf_prevent_count == 0); + res->ms_prevent_count = 1; + res->pf_prevent_count = 1; + DUK_ASSERT(res->ms_running == 0); + + res->call_recursion_depth = 0; + res->call_recursion_limit = DUK_USE_NATIVE_CALL_RECLIMIT; + + /* XXX: use the pointer as a seed for now: mix in time at least */ + + /* The casts through duk_uintptr_t is to avoid the following GCC warning: + * + * warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] + * + * This still generates a /Wp64 warning on VS2010 when compiling for x86. + */ +#if defined(DUK_USE_ROM_STRINGS) + /* XXX: make a common DUK_USE_ option, and allow custom fixed seed? */ + DUK_D(DUK_DPRINT("using rom strings, force heap hash_seed to fixed value 0x%08lx", (long) DUK__FIXED_HASH_SEED)); + res->hash_seed = (duk_uint32_t) DUK__FIXED_HASH_SEED; +#else /* DUK_USE_ROM_STRINGS */ + res->hash_seed = (duk_uint32_t) (duk_uintptr_t) res; +#if !defined(DUK_USE_STRHASH_DENSE) + res->hash_seed ^= 5381; /* Bernstein hash init value is normally 5381; XOR it in in case pointer low bits are 0 */ +#endif +#endif /* DUK_USE_ROM_STRINGS */ + +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->lj.jmpbuf_ptr = NULL; +#endif + DUK_ASSERT(res->lj.type == DUK_LJ_TYPE_UNKNOWN); /* zero */ + DUK_ASSERT(res->lj.iserror == 0); + DUK_TVAL_SET_UNDEFINED(&res->lj.value1); + DUK_TVAL_SET_UNDEFINED(&res->lj.value2); + + DUK_ASSERT_LJSTATE_UNSET(res); + + /* + * Init stringtable: fixed variant + */ + + st_initsize = DUK_USE_STRTAB_MINSIZE; +#if defined(DUK_USE_STRTAB_PTRCOMP) + res->strtable16 = (duk_uint16_t *) alloc_func(heap_udata, sizeof(duk_uint16_t) * st_initsize); + if (res->strtable16 == NULL) { + goto failed; + } +#else + res->strtable = (duk_hstring **) alloc_func(heap_udata, sizeof(duk_hstring *) * st_initsize); + if (res->strtable == NULL) { + goto failed; + } +#endif + res->st_size = st_initsize; + res->st_mask = st_initsize - 1; +#if (DUK_USE_STRTAB_MINSIZE != DUK_USE_STRTAB_MAXSIZE) + DUK_ASSERT(res->st_count == 0); +#endif + +#if defined(DUK_USE_STRTAB_PTRCOMP) + /* zero assumption */ + duk_memzero(res->strtable16, sizeof(duk_uint16_t) * st_initsize); +#else +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + { + duk_uint32_t i; + for (i = 0; i < st_initsize; i++) { + res->strtable[i] = NULL; + } + } +#else + duk_memzero(res->strtable, sizeof(duk_hstring *) * st_initsize); +#endif /* DUK_USE_EXPLICIT_NULL_INIT */ +#endif /* DUK_USE_STRTAB_PTRCOMP */ + + /* + * Init stringcache + */ + +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + { + duk_uint_t i; + for (i = 0; i < DUK_HEAP_STRCACHE_SIZE; i++) { + res->strcache[i].h = NULL; + } + } +#endif + + /* + * Init litcache + */ +#if defined(DUK_USE_LITCACHE_SIZE) + DUK_ASSERT(DUK_USE_LITCACHE_SIZE > 0); + DUK_ASSERT(DUK_IS_POWER_OF_TWO((duk_uint_t) DUK_USE_LITCACHE_SIZE)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + { + duk_uint_t i; + for (i = 0; i < DUK_USE_LITCACHE_SIZE; i++) { + res->litcache[i].addr = NULL; + res->litcache[i].h = NULL; + } + } +#endif +#endif /* DUK_USE_LITCACHE_SIZE */ + + /* XXX: error handling is incomplete. It would be cleanest if + * there was a setjmp catchpoint, so that all init code could + * freely throw errors. If that were the case, the return code + * passing here could be removed. + */ + + /* + * Init built-in strings + */ + +#if defined(DUK_USE_INJECT_HEAP_ALLOC_ERROR) && (DUK_USE_INJECT_HEAP_ALLOC_ERROR == 2) + goto failed; +#endif + DUK_D(DUK_DPRINT("heap init: initialize heap strings")); + if (!duk__init_heap_strings(res)) { + goto failed; + } + + /* + * Init the heap thread + */ + +#if defined(DUK_USE_INJECT_HEAP_ALLOC_ERROR) && (DUK_USE_INJECT_HEAP_ALLOC_ERROR == 3) + goto failed; +#endif + DUK_D(DUK_DPRINT("heap init: initialize heap thread")); + if (!duk__init_heap_thread(res)) { + goto failed; + } + + /* + * Init the heap object + */ + +#if defined(DUK_USE_INJECT_HEAP_ALLOC_ERROR) && (DUK_USE_INJECT_HEAP_ALLOC_ERROR == 4) + goto failed; +#endif + DUK_D(DUK_DPRINT("heap init: initialize heap object")); + DUK_ASSERT(res->heap_thread != NULL); + res->heap_object = duk_hobject_alloc_unchecked(res, DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT)); + if (res->heap_object == NULL) { + goto failed; + } + DUK_HOBJECT_INCREF(res->heap_thread, res->heap_object); + + /* + * Odds and ends depending on the heap thread + */ + +#if !defined(DUK_USE_GET_RANDOM_DOUBLE) +#if defined(DUK_USE_PREFER_SIZE) || !defined(DUK_USE_64BIT_OPS) + res->rnd_state = (duk_uint32_t) duk_time_get_ecmascript_time(res->heap_thread); + duk_util_tinyrandom_prepare_seed(res->heap_thread); +#else + res->rnd_state[0] = (duk_uint64_t) duk_time_get_ecmascript_time(res->heap_thread); + DUK_ASSERT(res->rnd_state[1] == 0); /* Not filled here, filled in by seed preparation. */ +#if 0 /* Manual test values matching misc/xoroshiro128plus_test.c. */ + res->rnd_state[0] = DUK_U64_CONSTANT(0xdeadbeef12345678); + res->rnd_state[1] = DUK_U64_CONSTANT(0xcafed00d12345678); +#endif + duk_util_tinyrandom_prepare_seed(res->heap_thread); + /* Mix in heap pointer: this ensures that if two Duktape heaps are + * created on the same millisecond, they get a different PRNG + * sequence (unless e.g. virtual memory addresses cause also the + * heap object pointer to be the same). + */ + { + duk_uint64_t tmp_u64; + tmp_u64 = 0; + duk_memcpy((void *) &tmp_u64, + (const void *) &res, + (size_t) (sizeof(void *) >= sizeof(duk_uint64_t) ? sizeof(duk_uint64_t) : sizeof(void *))); + res->rnd_state[1] ^= tmp_u64; + } + do { + duk_small_uint_t i; + for (i = 0; i < 10; i++) { + /* Throw away a few initial random numbers just in + * case. Probably unnecessary due to SplitMix64 + * preparation. + */ + (void) duk_util_tinyrandom_get_double(res->heap_thread); + } + } while (0); +#endif +#endif + + /* + * Allow finalizer and mark-and-sweep processing. + */ + + DUK_D(DUK_DPRINT("heap init: allow finalizer/mark-and-sweep processing")); + DUK_ASSERT(res->ms_prevent_count == 1); + DUK_ASSERT(res->pf_prevent_count == 1); + res->ms_prevent_count = 0; + res->pf_prevent_count = 0; + DUK_ASSERT(res->ms_running == 0); +#if defined(DUK_USE_ASSERTIONS) + res->heap_initializing = 0; +#endif + + /* + * All done. + */ + + DUK_D(DUK_DPRINT("allocated heap: %p", (void *) res)); + return res; + + failed: + DUK_D(DUK_DPRINT("heap allocation failed")); + + if (res != NULL) { + /* Assumes that allocated pointers and alloc funcs are valid + * if res exists. + */ + DUK_ASSERT(res->ms_prevent_count == 1); + DUK_ASSERT(res->pf_prevent_count == 1); + DUK_ASSERT(res->ms_running == 0); + if (res->heap_thread != NULL) { + res->ms_prevent_count = 0; + res->pf_prevent_count = 0; + } +#if defined(DUK_USE_ASSERTIONS) + res->heap_initializing = 0; +#endif + + DUK_ASSERT(res->alloc_func != NULL); + DUK_ASSERT(res->realloc_func != NULL); + DUK_ASSERT(res->free_func != NULL); + duk_heap_free(res); + } + + return NULL; +} + +/* automatic undefs */ +#undef DUK__DUMPLM_SIGNED +#undef DUK__DUMPLM_SIGNED_RAW +#undef DUK__DUMPLM_UNSIGNED +#undef DUK__DUMPLM_UNSIGNED_RAW +#undef DUK__DUMPSZ +#undef DUK__FIXED_HASH_SEED +#line 1 "duk_heap_finalize.c" +/* + * Finalizer handling. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) + +/* + * Fake torture finalizer. + */ + +#if defined(DUK_USE_FINALIZER_TORTURE) +DUK_LOCAL duk_ret_t duk__fake_global_finalizer(duk_hthread *thr) { + DUK_DD(DUK_DDPRINT("fake global torture finalizer executed")); + + /* Require a lot of stack to force a value stack grow/shrink. */ + duk_require_stack(thr, 100000); + + /* Force a reallocation with pointer change for value stack + * to maximize side effects. + */ + duk_hthread_valstack_torture_realloc(thr); + + /* Inner function call, error throw. */ + duk_eval_string_noresult(thr, + "(function dummy() {\n" + " dummy.prototype = null; /* break reference loop */\n" + " try {\n" + " throw 'fake-finalizer-dummy-error';\n" + " } catch (e) {\n" + " void e;\n" + " }\n" + "})()"); + + /* The above creates garbage (e.g. a function instance). Because + * the function/prototype reference loop is broken, it gets collected + * immediately by DECREF. If Function.prototype has a _Finalizer + * property (happens in some test cases), the garbage gets queued to + * finalize_list. This still won't cause an infinite loop because + * the torture finalizer is called once per finalize_list run and + * the garbage gets handled in the same run. (If the garbage needs + * mark-and-sweep collection, an infinite loop might ensue.) + */ + return 0; +} + +DUK_LOCAL void duk__run_global_torture_finalizer(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + + /* Avoid fake finalization when callstack limit is near. Otherwise + * a callstack limit error will be created, then refzero'ed. The + * +5 headroom is conservative. + */ + if (thr->heap->call_recursion_depth + 5 >= thr->heap->call_recursion_limit || + thr->callstack_top + 5 >= DUK_USE_CALLSTACK_LIMIT) { + DUK_D(DUK_DPRINT("skip global torture finalizer, too little headroom for call recursion or call stack size")); + return; + } + + /* Run fake finalizer. Avoid creating unnecessary garbage. */ + duk_push_c_function(thr, duk__fake_global_finalizer, 0 /*nargs*/); + (void) duk_pcall(thr, 0 /*nargs*/); + duk_pop(thr); +} +#endif /* DUK_USE_FINALIZER_TORTURE */ + +/* + * Process the finalize_list to completion. + * + * An object may be placed on finalize_list by either refcounting or + * mark-and-sweep. The refcount of objects placed by refcounting will be + * zero; the refcount of objects placed by mark-and-sweep is > 0. In both + * cases the refcount is bumped by 1 artificially so that a REFZERO event + * can never happen while an object is waiting for finalization. Without + * this bump a REFZERO could now happen because user code may call + * duk_push_heapptr() and then pop a value even when it's on finalize_list. + * + * List processing assumes refcounts are kept up-to-date at all times, so + * that once the finalizer returns, a zero refcount is a reliable reason to + * free the object immediately rather than place it back to the heap. This + * is the case because we run outside of refzero_list processing so that + * DECREF cascades are handled fully inline. + * + * For mark-and-sweep queued objects (had_zero_refcount false) the object + * may be freed immediately if its refcount is zero after the finalizer call + * (i.e. finalizer removed the reference loop for the object). If not, the + * next mark-and-sweep will collect the object unless it has become reachable + * (i.e. rescued) by that time and its refcount hasn't fallen to zero before + * that. Mark-and-sweep detects these objects because their FINALIZED flag + * is set. + * + * There's an inherent limitation for mark-and-sweep finalizer rescuing: an + * object won't get refinalized if (1) it's rescued, but (2) becomes + * unreachable before mark-and-sweep has had time to notice it. The next + * mark-and-sweep round simply doesn't have any information of whether the + * object has been unreachable the whole time or not (the only way to get + * that information would be a mark-and-sweep pass for *every finalized + * object*). This is awkward for the application because the mark-and-sweep + * round is not generally visible or under full application control. + * + * For refcount queued objects (had_zero_refcount true) the object is either + * immediately freed or rescued, and waiting for a mark-and-sweep round is not + * necessary (or desirable); FINALIZED is cleared when a rescued object is + * queued back to heap_allocated. The object is eligible for finalization + * again (either via refcounting or mark-and-sweep) immediately after being + * rescued. If a refcount finalized object is placed into an unreachable + * reference loop by its finalizer, it will get collected by mark-and-sweep + * and currently the finalizer will execute again. + * + * There's a special case where: + * + * - Mark-and-sweep queues an object to finalize_list for finalization. + * - The finalizer is executed, FINALIZED is set, and object is queued + * back to heap_allocated, waiting for a new mark-and-sweep round. + * - The object's refcount drops to zero before mark-and-sweep has a + * chance to run another round and make a rescue/free decision. + * + * This is now handled by refzero code: if an object has a finalizer but + * FINALIZED is already set, the object is freed without finalizer processing. + * The outcome is the same as if mark-and-sweep was executed at that point; + * mark-and-sweep would also free the object without another finalizer run. + * This could also be changed so that the refzero-triggered finalizer *IS* + * executed: being refzero collected implies someone has operated on the + * object so it hasn't been totally unreachable the whole time. This would + * risk a finalizer loop however. + */ + +DUK_INTERNAL void duk_heap_process_finalize_list(duk_heap *heap) { + duk_heaphdr *curr; +#if defined(DUK_USE_DEBUG) + duk_size_t count = 0; +#endif + + DUK_DDD(DUK_DDDPRINT("duk_heap_process_finalize_list: %p", (void *) heap)); + + if (heap->pf_prevent_count != 0) { + DUK_DDD(DUK_DDDPRINT("skip finalize_list processing: pf_prevent_count != 0")); + return; + } + + /* Heap alloc prevents mark-and-sweep before heap_thread is ready. */ + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(heap->heap_thread->valstack != NULL); +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); +#endif + + DUK_ASSERT(heap->pf_prevent_count == 0); + heap->pf_prevent_count = 1; + + /* Mark-and-sweep no longer needs to be prevented when running + * finalizers: mark-and-sweep skips any rescue decisions if there + * are any objects in finalize_list when mark-and-sweep is entered. + * This protects finalized objects from incorrect rescue decisions + * caused by finalize_list being a reachability root and only + * partially processed. Freeing decisions are not postponed. + */ + + /* When finalizer torture is enabled, make a fake finalizer call with + * maximum side effects regardless of whether finalize_list is empty. + */ +#if defined(DUK_USE_FINALIZER_TORTURE) + duk__run_global_torture_finalizer(heap->heap_thread); +#endif + + /* Process finalize_list until it becomes empty. There's currently no + * protection against a finalizer always creating more garbage. + */ + while ((curr = heap->finalize_list) != NULL) { +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_bool_t queue_back; +#endif + + DUK_DD(DUK_DDPRINT("processing finalize_list entry: %p -> %!iO", (void *) curr, curr)); + + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(curr) == DUK_HTYPE_OBJECT); /* Only objects have finalizers. */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_REACHABLE(curr)); + DUK_ASSERT(!DUK_HEAPHDR_HAS_TEMPROOT(curr)); + DUK_ASSERT(DUK_HEAPHDR_HAS_FINALIZABLE(curr)); /* All objects on finalize_list will have this flag (except object being finalized right now). */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZED(curr)); /* Queueing code ensures. */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY(curr)); /* ROM objects never get freed (or finalized). */ + +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(heap->currently_finalizing == NULL); + heap->currently_finalizing = curr; +#endif + + /* Clear FINALIZABLE for object being finalized, so that + * duk_push_heapptr() can properly ignore the object. + */ + DUK_HEAPHDR_CLEAR_FINALIZABLE(curr); + + if (DUK_LIKELY(!heap->pf_skip_finalizers)) { + /* Run the finalizer, duk_heap_run_finalizer() sets + * and checks for FINALIZED to prevent the finalizer + * from executing multiple times per finalization cycle. + * (This safeguard shouldn't be actually needed anymore). + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_bool_t had_zero_refcount; +#endif + + /* The object's refcount is >0 throughout so it won't be + * refzero processed prematurely. + */ +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(curr) >= 1); + had_zero_refcount = (DUK_HEAPHDR_GET_REFCOUNT(curr) == 1); /* Preincremented on finalize_list insert. */ +#endif + + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZED(curr)); + duk_heap_run_finalizer(heap, (duk_hobject *) curr); /* must never longjmp */ + DUK_ASSERT(DUK_HEAPHDR_HAS_FINALIZED(curr)); + /* XXX: assert that object is still in finalize_list + * when duk_push_heapptr() allows automatic rescue. + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_DD(DUK_DDPRINT("refcount after finalizer (includes bump): %ld", (long) DUK_HEAPHDR_GET_REFCOUNT(curr))); + if (DUK_HEAPHDR_GET_REFCOUNT(curr) == 1) { /* Only artificial bump in refcount? */ +#if defined(DUK_USE_DEBUG) + if (had_zero_refcount) { + DUK_DD(DUK_DDPRINT("finalized object's refcount is zero -> free immediately (refcount queued)")); + } else { + DUK_DD(DUK_DDPRINT("finalized object's refcount is zero -> free immediately (mark-and-sweep queued)")); + } +#endif + queue_back = 0; + } else +#endif + { +#if defined(DUK_USE_REFERENCE_COUNTING) + queue_back = 1; + if (had_zero_refcount) { + /* When finalization is triggered + * by refzero and we queue the object + * back, clear FINALIZED right away + * so that the object can be refinalized + * immediately if necessary. + */ + DUK_HEAPHDR_CLEAR_FINALIZED(curr); + } +#endif + } + } else { + /* Used during heap destruction: don't actually run finalizers + * because we're heading into forced finalization. Instead, + * queue finalizable objects back to the heap_allocated list. + */ + DUK_D(DUK_DPRINT("skip finalizers flag set, queue object to heap_allocated without finalizing")); + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZED(curr)); +#if defined(DUK_USE_REFERENCE_COUNTING) + queue_back = 1; +#endif + } + + /* Dequeue object from finalize_list. Note that 'curr' may no + * longer be finalize_list head because new objects may have + * been queued to the list. As a result we can't optimize for + * the single-linked heap case and must scan the list for + * removal, typically the scan is very short however. + */ + DUK_HEAP_REMOVE_FROM_FINALIZE_LIST(heap, curr); + + /* Queue back to heap_allocated or free immediately. */ +#if defined(DUK_USE_REFERENCE_COUNTING) + if (queue_back) { + /* FINALIZED is only cleared if object originally + * queued for finalization by refcounting. For + * mark-and-sweep FINALIZED is left set, so that + * next mark-and-sweep round can make a rescue/free + * decision. + */ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(curr) >= 1); + DUK_HEAPHDR_PREDEC_REFCOUNT(curr); /* Remove artificial refcount bump. */ + DUK_HEAPHDR_CLEAR_FINALIZABLE(curr); + DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(heap, curr); + } else { + /* No need to remove the refcount bump here. */ + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(curr) == DUK_HTYPE_OBJECT); /* currently, always the case */ + DUK_DD(DUK_DDPRINT("refcount finalize after finalizer call: %!O", curr)); + duk_hobject_refcount_finalize_norz(heap, (duk_hobject *) curr); + duk_free_hobject(heap, (duk_hobject *) curr); + DUK_DD(DUK_DDPRINT("freed hobject after finalization: %p", (void *) curr)); + } +#else /* DUK_USE_REFERENCE_COUNTING */ + DUK_HEAPHDR_CLEAR_FINALIZABLE(curr); + DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(heap, curr); +#endif /* DUK_USE_REFERENCE_COUNTING */ + +#if defined(DUK_USE_DEBUG) + count++; +#endif + +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(heap->currently_finalizing != NULL); + heap->currently_finalizing = NULL; +#endif + } + + /* finalize_list will always be processed completely. */ + DUK_ASSERT(heap->finalize_list == NULL); + +#if 0 + /* While NORZ macros are used above, this is unnecessary because the + * only pending side effects are now finalizers, and finalize_list is + * empty. + */ + DUK_REFZERO_CHECK_SLOW(heap->heap_thread); +#endif + + /* Prevent count may be bumped while finalizers run, but should always + * be reliably unbumped by the time we get here. + */ + DUK_ASSERT(heap->pf_prevent_count == 1); + heap->pf_prevent_count = 0; + +#if defined(DUK_USE_DEBUG) + DUK_DD(DUK_DDPRINT("duk_heap_process_finalize_list: %ld finalizers called", (long) count)); +#endif +} + +/* + * Run an duk_hobject finalizer. Must never throw an uncaught error + * (but may throw caught errors). + * + * There is no return value. Any return value or error thrown by + * the finalizer is ignored (although errors are debug logged). + * + * Notes: + * + * - The finalizer thread 'top' assertions are there because it is + * critical that strict stack policy is observed (i.e. no cruft + * left on the finalizer stack). + */ + +DUK_LOCAL duk_ret_t duk__finalize_helper(duk_hthread *thr, void *udata) { + DUK_ASSERT(thr != NULL); + DUK_UNREF(udata); + + DUK_DDD(DUK_DDDPRINT("protected finalization helper running")); + + /* [... obj] */ + + /* _Finalizer property is read without checking if the value is + * callable or even exists. This is intentional, and handled + * by throwing an error which is caught by the safe call wrapper. + * + * XXX: Finalizer lookup should traverse the prototype chain (to allow + * inherited finalizers) but should not invoke accessors or proxy object + * behavior. At the moment this lookup will invoke proxy behavior, so + * caller must ensure that this function is not called if the target is + * a Proxy. + */ + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_FINALIZER); /* -> [... obj finalizer] */ + duk_dup_m2(thr); + duk_push_boolean(thr, DUK_HEAP_HAS_FINALIZER_NORESCUE(thr->heap)); + DUK_DDD(DUK_DDDPRINT("calling finalizer")); + duk_call(thr, 2); /* [ ... obj finalizer obj heapDestruct ] -> [ ... obj retval ] */ + DUK_DDD(DUK_DDDPRINT("finalizer returned successfully")); + return 0; + + /* Note: we rely on duk_safe_call() to fix up the stack for the caller, + * so we don't need to pop stuff here. There is no return value; + * caller determines rescued status based on object refcount. + */ +} + +DUK_INTERNAL void duk_heap_run_finalizer(duk_heap *heap, duk_hobject *obj) { + duk_hthread *thr; + duk_ret_t rc; +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t entry_top; +#endif + + DUK_DD(DUK_DDPRINT("running duk_hobject finalizer for object: %p", (void *) obj)); + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + thr = heap->heap_thread; + DUK_ASSERT(obj != NULL); + DUK_ASSERT_VALSTACK_SPACE(heap->heap_thread, 1); + +#if defined(DUK_USE_ASSERTIONS) + entry_top = duk_get_top(thr); +#endif + /* + * Get and call the finalizer. All of this must be wrapped + * in a protected call, because even getting the finalizer + * may trigger an error (getter may throw one, for instance). + */ + + /* ROM objects could inherit a finalizer, but they are never deemed + * unreachable by mark-and-sweep, and their refcount never falls to 0. + */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)); + + /* Duktape 2.1: finalize_list never contains objects with FINALIZED + * set, so no need to check here. + */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) obj)); +#if 0 + if (DUK_HEAPHDR_HAS_FINALIZED((duk_heaphdr *) obj)) { + DUK_D(DUK_DPRINT("object already finalized, avoid running finalizer twice: %!O", obj)); + return; + } +#endif + DUK_HEAPHDR_SET_FINALIZED((duk_heaphdr *) obj); /* ensure never re-entered until rescue cycle complete */ + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_HOBJECT_IS_PROXY(obj)) { + /* This may happen if duk_set_finalizer() or Duktape.fin() is + * called for a Proxy object. In such cases the fast finalizer + * flag will be set on the Proxy, not the target, and neither + * will be finalized. + */ + DUK_D(DUK_DPRINT("object is a Proxy, skip finalizer call")); + return; + } +#endif /* DUK_USE_ES6_PROXY */ + + duk_push_hobject(thr, obj); /* this also increases refcount by one */ + rc = duk_safe_call(thr, duk__finalize_helper, NULL /*udata*/, 0 /*nargs*/, 1 /*nrets*/); /* -> [... obj retval/error] */ + DUK_ASSERT_TOP(thr, entry_top + 2); /* duk_safe_call discipline */ + + if (rc != DUK_EXEC_SUCCESS) { + /* Note: we ask for one return value from duk_safe_call to get this + * error debugging here. + */ + DUK_D(DUK_DPRINT("wrapped finalizer call failed for object %p (ignored); error: %!T", + (void *) obj, (duk_tval *) duk_get_tval(thr, -1))); + } + duk_pop_2(thr); /* -> [...] */ + + DUK_ASSERT_TOP(thr, entry_top); +} + +#else /* DUK_USE_FINALIZER_SUPPORT */ + +/* nothing */ + +#endif /* DUK_USE_FINALIZER_SUPPORT */ +#line 1 "duk_heap_hashstring.c" +/* + * String hash computation (interning). + * + * String hashing is performance critical because a string hash is computed + * for all new strings which are candidates to be added to the string table. + * However, strings actually added to the string table go through a codepoint + * length calculation which dominates performance because it goes through + * every byte of the input string (but only for strings added). + * + * The string hash algorithm should be fast, but on the other hand provide + * good enough hashes to ensure both string table and object property table + * hash tables work reasonably well (i.e., there aren't too many collisions + * with real world inputs). Unless the hash is cryptographic, it's always + * possible to craft inputs with maximal hash collisions. + * + * NOTE: The hash algorithms must match tools/dukutil.py:duk_heap_hashstring() + * for ROM string support! + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_STRHASH_DENSE) +/* Constants for duk_hashstring(). */ +#define DUK__STRHASH_SHORTSTRING 4096L +#define DUK__STRHASH_MEDIUMSTRING (256L * 1024L) +#define DUK__STRHASH_BLOCKSIZE 256L + +DUK_INTERNAL duk_uint32_t duk_heap_hashstring(duk_heap *heap, const duk_uint8_t *str, duk_size_t len) { + duk_uint32_t hash; + + /* Use Murmurhash2 directly for short strings, and use "block skipping" + * for long strings: hash an initial part and then sample the rest of + * the string with reasonably sized chunks. An initial offset for the + * sampling is computed based on a hash of the initial part of the string; + * this is done to (usually) avoid the case where all long strings have + * certain offset ranges which are never sampled. + * + * Skip should depend on length and bound the total time to roughly + * logarithmic. With current values: + * + * 1M string => 256 * 241 = 61696 bytes (0.06M) of hashing + * 1G string => 256 * 16321 = 4178176 bytes (3.98M) of hashing + * + * XXX: It would be better to compute the skip offset more "smoothly" + * instead of having a few boundary values. + */ + + /* note: mixing len into seed improves hashing when skipping */ + duk_uint32_t str_seed = heap->hash_seed ^ ((duk_uint32_t) len); + + if (len <= DUK__STRHASH_SHORTSTRING) { + hash = duk_util_hashbytes(str, len, str_seed); + } else { + duk_size_t off; + duk_size_t skip; + + if (len <= DUK__STRHASH_MEDIUMSTRING) { + skip = (duk_size_t) (16 * DUK__STRHASH_BLOCKSIZE + DUK__STRHASH_BLOCKSIZE); + } else { + skip = (duk_size_t) (256 * DUK__STRHASH_BLOCKSIZE + DUK__STRHASH_BLOCKSIZE); + } + + hash = duk_util_hashbytes(str, (duk_size_t) DUK__STRHASH_SHORTSTRING, str_seed); + off = DUK__STRHASH_SHORTSTRING + (skip * (hash % 256)) / 256; + + /* XXX: inefficient loop */ + while (off < len) { + duk_size_t left = len - off; + duk_size_t now = (duk_size_t) (left > DUK__STRHASH_BLOCKSIZE ? DUK__STRHASH_BLOCKSIZE : left); + hash ^= duk_util_hashbytes(str + off, now, str_seed); + off += skip; + } + } + +#if defined(DUK_USE_STRHASH16) + /* Truncate to 16 bits here, so that a computed hash can be compared + * against a hash stored in a 16-bit field. + */ + hash &= 0x0000ffffUL; +#endif + return hash; +} +#else /* DUK_USE_STRHASH_DENSE */ +DUK_INTERNAL duk_uint32_t duk_heap_hashstring(duk_heap *heap, const duk_uint8_t *str, duk_size_t len) { + duk_uint32_t hash; + duk_size_t step; + duk_size_t off; + + /* Slightly modified "Bernstein hash" from: + * + * http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx + * + * Modifications: string skipping and reverse direction similar to + * Lua 5.1.5, and different hash initializer. + * + * The reverse direction ensures last byte it always included in the + * hash which is a good default as changing parts of the string are + * more often in the suffix than in the prefix. + */ + + hash = heap->hash_seed ^ ((duk_uint32_t) len); /* Bernstein hash init value is normally 5381 */ + step = (len >> DUK_USE_STRHASH_SKIP_SHIFT) + 1; + for (off = len; off >= step; off -= step) { + DUK_ASSERT(off >= 1); /* off >= step, and step >= 1 */ + hash = (hash * 33) + str[off - 1]; + } + +#if defined(DUK_USE_STRHASH16) + /* Truncate to 16 bits here, so that a computed hash can be compared + * against a hash stored in a 16-bit field. + */ + hash &= 0x0000ffffUL; +#endif + return hash; +} +#endif /* DUK_USE_STRHASH_DENSE */ + +/* automatic undefs */ +#undef DUK__STRHASH_BLOCKSIZE +#undef DUK__STRHASH_MEDIUMSTRING +#undef DUK__STRHASH_SHORTSTRING +#line 1 "duk_heap_markandsweep.c" +/* + * Mark-and-sweep garbage collection. + */ + +/* #include duk_internal.h -> already included */ + +DUK_LOCAL_DECL void duk__mark_heaphdr(duk_heap *heap, duk_heaphdr *h); +DUK_LOCAL_DECL void duk__mark_heaphdr_nonnull(duk_heap *heap, duk_heaphdr *h); +DUK_LOCAL_DECL void duk__mark_tval(duk_heap *heap, duk_tval *tv); +DUK_LOCAL_DECL void duk__mark_tvals(duk_heap *heap, duk_tval *tv, duk_idx_t count); + +/* + * Marking functions for heap types: mark children recursively. + */ + +DUK_LOCAL void duk__mark_hstring(duk_heap *heap, duk_hstring *h) { + DUK_UNREF(heap); + DUK_UNREF(h); + + DUK_DDD(DUK_DDDPRINT("duk__mark_hstring: %p", (void *) h)); + DUK_ASSERT(h); + + /* nothing to process */ +} + +DUK_LOCAL void duk__mark_hobject(duk_heap *heap, duk_hobject *h) { + duk_uint_fast32_t i; + + DUK_DDD(DUK_DDDPRINT("duk__mark_hobject: %p", (void *) h)); + + DUK_ASSERT(h); + + /* XXX: use advancing pointers instead of index macros -> faster and smaller? */ + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(h); i++) { + duk_hstring *key = DUK_HOBJECT_E_GET_KEY(heap, h, i); + if (key == NULL) { + continue; + } + duk__mark_heaphdr_nonnull(heap, (duk_heaphdr *) key); + if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap, h, i)) { + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->a.get); + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->a.set); + } else { + duk__mark_tval(heap, &DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->v); + } + } + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ASIZE(h); i++) { + duk__mark_tval(heap, DUK_HOBJECT_A_GET_VALUE_PTR(heap, h, i)); + } + + /* Hash part is a 'weak reference' and does not contribute. */ + + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_HOBJECT_GET_PROTOTYPE(heap, h)); + + /* Fast path for objects which don't have a subclass struct, or have a + * subclass struct but nothing that needs marking in the subclass struct. + */ + if (DUK_HOBJECT_HAS_FASTREFS(h)) { + DUK_ASSERT(DUK_HOBJECT_ALLOWS_FASTREFS(h)); + return; + } + DUK_ASSERT(DUK_HOBJECT_PROHIBITS_FASTREFS(h)); + + /* XXX: reorg, more common first */ + if (DUK_HOBJECT_IS_COMPFUNC(h)) { + duk_hcompfunc *f = (duk_hcompfunc *) h; + duk_tval *tv, *tv_end; + duk_hobject **fn, **fn_end; + + DUK_ASSERT_HCOMPFUNC_VALID(f); + + /* 'data' is reachable through every compiled function which + * contains a reference. + */ + + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_HCOMPFUNC_GET_DATA(heap, f)); + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_HCOMPFUNC_GET_LEXENV(heap, f)); + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_HCOMPFUNC_GET_VARENV(heap, f)); + + if (DUK_HCOMPFUNC_GET_DATA(heap, f) != NULL) { + tv = DUK_HCOMPFUNC_GET_CONSTS_BASE(heap, f); + tv_end = DUK_HCOMPFUNC_GET_CONSTS_END(heap, f); + while (tv < tv_end) { + duk__mark_tval(heap, tv); + tv++; + } + + fn = DUK_HCOMPFUNC_GET_FUNCS_BASE(heap, f); + fn_end = DUK_HCOMPFUNC_GET_FUNCS_END(heap, f); + while (fn < fn_end) { + duk__mark_heaphdr_nonnull(heap, (duk_heaphdr *) *fn); + fn++; + } + } else { + /* May happen in some out-of-memory corner cases. */ + DUK_D(DUK_DPRINT("duk_hcompfunc 'data' is NULL, skipping marking")); + } + } else if (DUK_HOBJECT_IS_DECENV(h)) { + duk_hdecenv *e = (duk_hdecenv *) h; + DUK_ASSERT_HDECENV_VALID(e); + duk__mark_heaphdr(heap, (duk_heaphdr *) e->thread); + duk__mark_heaphdr(heap, (duk_heaphdr *) e->varmap); + } else if (DUK_HOBJECT_IS_OBJENV(h)) { + duk_hobjenv *e = (duk_hobjenv *) h; + DUK_ASSERT_HOBJENV_VALID(e); + duk__mark_heaphdr_nonnull(heap, (duk_heaphdr *) e->target); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + } else if (DUK_HOBJECT_IS_BUFOBJ(h)) { + duk_hbufobj *b = (duk_hbufobj *) h; + DUK_ASSERT_HBUFOBJ_VALID(b); + duk__mark_heaphdr(heap, (duk_heaphdr *) b->buf); + duk__mark_heaphdr(heap, (duk_heaphdr *) b->buf_prop); +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + } else if (DUK_HOBJECT_IS_BOUNDFUNC(h)) { + duk_hboundfunc *f = (duk_hboundfunc *) (void *) h; + DUK_ASSERT_HBOUNDFUNC_VALID(f); + duk__mark_tval(heap, &f->target); + duk__mark_tval(heap, &f->this_binding); + duk__mark_tvals(heap, f->args, f->nargs); +#if defined(DUK_USE_ES6_PROXY) + } else if (DUK_HOBJECT_IS_PROXY(h)) { + duk_hproxy *p = (duk_hproxy *) h; + DUK_ASSERT_HPROXY_VALID(p); + duk__mark_heaphdr_nonnull(heap, (duk_heaphdr *) p->target); + duk__mark_heaphdr_nonnull(heap, (duk_heaphdr *) p->handler); +#endif /* DUK_USE_ES6_PROXY */ + } else if (DUK_HOBJECT_IS_THREAD(h)) { + duk_hthread *t = (duk_hthread *) h; + duk_activation *act; + duk_tval *tv; + + DUK_ASSERT_HTHREAD_VALID(t); + + tv = t->valstack; + while (tv < t->valstack_top) { + duk__mark_tval(heap, tv); + tv++; + } + + for (act = t->callstack_curr; act != NULL; act = act->parent) { + duk__mark_heaphdr(heap, (duk_heaphdr *) DUK_ACT_GET_FUNC(act)); + duk__mark_heaphdr(heap, (duk_heaphdr *) act->var_env); + duk__mark_heaphdr(heap, (duk_heaphdr *) act->lex_env); +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + duk__mark_heaphdr(heap, (duk_heaphdr *) act->prev_caller); +#endif +#if 0 /* nothing now */ + for (cat = act->cat; cat != NULL; cat = cat->parent) { + } +#endif + } + + duk__mark_heaphdr(heap, (duk_heaphdr *) t->resumer); + + for (i = 0; i < DUK_NUM_BUILTINS; i++) { + duk__mark_heaphdr(heap, (duk_heaphdr *) t->builtins[i]); + } + } else { + /* We may come here if the object should have a FASTREFS flag + * but it's missing for some reason. Assert for never getting + * here; however, other than performance, this is harmless. + */ + DUK_D(DUK_DPRINT("missing FASTREFS flag for: %!iO", h)); + DUK_ASSERT(0); + } +} + +/* Mark any duk_heaphdr type. Recursion tracking happens only here. */ +DUK_LOCAL void duk__mark_heaphdr(duk_heap *heap, duk_heaphdr *h) { + DUK_DDD(DUK_DDDPRINT("duk__mark_heaphdr %p, type %ld", + (void *) h, + (h != NULL ? (long) DUK_HEAPHDR_GET_TYPE(h) : (long) -1))); + + /* XXX: add non-null variant? */ + if (h == NULL) { + return; + } + + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY(h) || DUK_HEAPHDR_HAS_REACHABLE(h)); + +#if defined(DUK_USE_ASSERTIONS) && defined(DUK_USE_REFERENCE_COUNTING) + if (!DUK_HEAPHDR_HAS_READONLY(h)) { + h->h_assert_refcount++; /* Comparison refcount: bump even if already reachable. */ + } +#endif + if (DUK_HEAPHDR_HAS_REACHABLE(h)) { + DUK_DDD(DUK_DDDPRINT("already marked reachable, skip")); + return; + } +#if defined(DUK_USE_ROM_OBJECTS) + /* READONLY objects always have REACHABLE set, so the check above + * will prevent READONLY objects from being marked here. + */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY(h)); +#endif + + DUK_HEAPHDR_SET_REACHABLE(h); + + if (heap->ms_recursion_depth >= DUK_USE_MARK_AND_SWEEP_RECLIMIT) { + DUK_D(DUK_DPRINT("mark-and-sweep recursion limit reached, marking as temproot: %p", (void *) h)); + DUK_HEAP_SET_MARKANDSWEEP_RECLIMIT_REACHED(heap); + DUK_HEAPHDR_SET_TEMPROOT(h); + return; + } + + heap->ms_recursion_depth++; + DUK_ASSERT(heap->ms_recursion_depth != 0); /* Wrap. */ + + switch (DUK_HEAPHDR_GET_TYPE(h)) { + case DUK_HTYPE_STRING: + duk__mark_hstring(heap, (duk_hstring *) h); + break; + case DUK_HTYPE_OBJECT: + duk__mark_hobject(heap, (duk_hobject *) h); + break; + case DUK_HTYPE_BUFFER: + /* nothing to mark */ + break; + default: + DUK_D(DUK_DPRINT("attempt to mark heaphdr %p with invalid htype %ld", (void *) h, (long) DUK_HEAPHDR_GET_TYPE(h))); + DUK_UNREACHABLE(); + } + + DUK_ASSERT(heap->ms_recursion_depth > 0); + heap->ms_recursion_depth--; +} + +DUK_LOCAL void duk__mark_tval(duk_heap *heap, duk_tval *tv) { + DUK_DDD(DUK_DDDPRINT("duk__mark_tval %p", (void *) tv)); + if (tv == NULL) { + return; + } + if (DUK_TVAL_IS_HEAP_ALLOCATED(tv)) { + duk_heaphdr *h; + h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + duk__mark_heaphdr_nonnull(heap, h); + } +} + +DUK_LOCAL void duk__mark_tvals(duk_heap *heap, duk_tval *tv, duk_idx_t count) { + DUK_ASSERT(count == 0 || tv != NULL); + + while (count-- > 0) { + if (DUK_TVAL_IS_HEAP_ALLOCATED(tv)) { + duk_heaphdr *h; + h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + duk__mark_heaphdr_nonnull(heap, h); + } + tv++; + } +} + +/* Mark any duk_heaphdr type, caller guarantees a non-NULL pointer. */ +DUK_LOCAL void duk__mark_heaphdr_nonnull(duk_heap *heap, duk_heaphdr *h) { + /* For now, just call the generic handler. Change when call sites + * are changed too. + */ + duk__mark_heaphdr(heap, h); +} + +/* + * Mark the heap. + */ + +DUK_LOCAL void duk__mark_roots_heap(duk_heap *heap) { + duk_small_uint_t i; + + DUK_DD(DUK_DDPRINT("duk__mark_roots_heap: %p", (void *) heap)); + + duk__mark_heaphdr(heap, (duk_heaphdr *) heap->heap_thread); + duk__mark_heaphdr(heap, (duk_heaphdr *) heap->heap_object); + + for (i = 0; i < DUK_HEAP_NUM_STRINGS; i++) { + duk_hstring *h = DUK_HEAP_GET_STRING(heap, i); + duk__mark_heaphdr(heap, (duk_heaphdr *) h); + } + + duk__mark_tval(heap, &heap->lj.value1); + duk__mark_tval(heap, &heap->lj.value2); + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + for (i = 0; i < heap->dbg_breakpoint_count; i++) { + duk__mark_heaphdr(heap, (duk_heaphdr *) heap->dbg_breakpoints[i].filename); + } +#endif +} + +/* + * Mark unreachable, finalizable objects. + * + * Such objects will be moved aside and their finalizers run later. They + * have to be treated as reachability roots for their properties etc to + * remain allocated. This marking is only done for unreachable values which + * would be swept later. + * + * Objects are first marked FINALIZABLE and only then marked as reachability + * roots; otherwise circular references might be handled inconsistently. + */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_LOCAL void duk__mark_finalizable(duk_heap *heap) { + duk_heaphdr *hdr; + duk_size_t count_finalizable = 0; + + DUK_DD(DUK_DDPRINT("duk__mark_finalizable: %p", (void *) heap)); + + DUK_ASSERT(heap->heap_thread != NULL); + + hdr = heap->heap_allocated; + while (hdr != NULL) { + /* A finalizer is looked up from the object and up its + * prototype chain (which allows inherited finalizers). + * The finalizer is checked for using a duk_hobject flag + * which is kept in sync with the presence and callability + * of a _Finalizer hidden symbol. + */ + + if (!DUK_HEAPHDR_HAS_REACHABLE(hdr) && + DUK_HEAPHDR_IS_OBJECT(hdr) && + !DUK_HEAPHDR_HAS_FINALIZED(hdr) && + DUK_HOBJECT_HAS_FINALIZER_FAST(heap, (duk_hobject *) hdr)) { + /* heaphdr: + * - is not reachable + * - is an object + * - is not a finalized object waiting for rescue/keep decision + * - has a finalizer + */ + + DUK_DD(DUK_DDPRINT("unreachable heap object will be " + "finalized -> mark as finalizable " + "and treat as a reachability root: %p", + (void *) hdr)); + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY(hdr)); + DUK_HEAPHDR_SET_FINALIZABLE(hdr); + count_finalizable++; + } + + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } + + if (count_finalizable == 0) { + return; + } + + DUK_DD(DUK_DDPRINT("marked %ld heap objects as finalizable, now mark them reachable", + (long) count_finalizable)); + + hdr = heap->heap_allocated; + while (hdr != NULL) { + if (DUK_HEAPHDR_HAS_FINALIZABLE(hdr)) { + duk__mark_heaphdr_nonnull(heap, hdr); + } + + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } + + /* Caller will finish the marking process if we hit a recursion limit. */ +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +/* + * Mark objects on finalize_list. + */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_LOCAL void duk__mark_finalize_list(duk_heap *heap) { + duk_heaphdr *hdr; +#if defined(DUK_USE_DEBUG) + duk_size_t count_finalize_list = 0; +#endif + + DUK_DD(DUK_DDPRINT("duk__mark_finalize_list: %p", (void *) heap)); + + hdr = heap->finalize_list; + while (hdr != NULL) { + duk__mark_heaphdr_nonnull(heap, hdr); + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); +#if defined(DUK_USE_DEBUG) + count_finalize_list++; +#endif + } + +#if defined(DUK_USE_DEBUG) + if (count_finalize_list > 0) { + DUK_D(DUK_DPRINT("marked %ld objects on the finalize_list as reachable (previous finalizer run skipped)", + (long) count_finalize_list)); + } +#endif +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +/* + * Fallback marking handler if recursion limit is reached. + * + * Iterates 'temproots' until recursion limit is no longer hit. Temproots + * can be in heap_allocated or finalize_list; refzero_list is now always + * empty for mark-and-sweep. A temproot may occur in finalize_list now if + * there are objects on the finalize_list and user code creates a reference + * from an object in heap_allocated to the object in finalize_list (which is + * now allowed), and it happened to coincide with the recursion depth limit. + * + * This is a slow scan, but guarantees that we finish with a bounded C stack. + * + * Note that nodes may have been marked as temproots before this scan begun, + * OR they may have been marked during the scan (as we process nodes + * recursively also during the scan). This is intended behavior. + */ + +#if defined(DUK_USE_DEBUG) +DUK_LOCAL void duk__handle_temproot(duk_heap *heap, duk_heaphdr *hdr, duk_size_t *count) { +#else +DUK_LOCAL void duk__handle_temproot(duk_heap *heap, duk_heaphdr *hdr) { +#endif + DUK_ASSERT(hdr != NULL); + + if (!DUK_HEAPHDR_HAS_TEMPROOT(hdr)) { + DUK_DDD(DUK_DDDPRINT("not a temp root: %p", (void *) hdr)); + return; + } + + DUK_DDD(DUK_DDDPRINT("found a temp root: %p", (void *) hdr)); + DUK_HEAPHDR_CLEAR_TEMPROOT(hdr); + DUK_HEAPHDR_CLEAR_REACHABLE(hdr); /* Done so that duk__mark_heaphdr() works correctly. */ +#if defined(DUK_USE_ASSERTIONS) && defined(DUK_USE_REFERENCE_COUNTING) + hdr->h_assert_refcount--; /* Same node visited twice. */ +#endif + duk__mark_heaphdr_nonnull(heap, hdr); + +#if defined(DUK_USE_DEBUG) + (*count)++; +#endif +} + +DUK_LOCAL void duk__mark_temproots_by_heap_scan(duk_heap *heap) { + duk_heaphdr *hdr; +#if defined(DUK_USE_DEBUG) + duk_size_t count; +#endif + + DUK_DD(DUK_DDPRINT("duk__mark_temproots_by_heap_scan: %p", (void *) heap)); + + while (DUK_HEAP_HAS_MARKANDSWEEP_RECLIMIT_REACHED(heap)) { + DUK_DD(DUK_DDPRINT("recursion limit reached, doing heap scan to continue from temproots")); + +#if defined(DUK_USE_DEBUG) + count = 0; +#endif + DUK_HEAP_CLEAR_MARKANDSWEEP_RECLIMIT_REACHED(heap); + + hdr = heap->heap_allocated; + while (hdr) { +#if defined(DUK_USE_DEBUG) + duk__handle_temproot(heap, hdr, &count); +#else + duk__handle_temproot(heap, hdr); +#endif + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } + +#if defined(DUK_USE_FINALIZER_SUPPORT) + hdr = heap->finalize_list; + while (hdr) { +#if defined(DUK_USE_DEBUG) + duk__handle_temproot(heap, hdr, &count); +#else + duk__handle_temproot(heap, hdr); +#endif + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } +#endif + +#if defined(DUK_USE_DEBUG) + DUK_DD(DUK_DDPRINT("temproot mark heap scan processed %ld temp roots", (long) count)); +#endif + } +} + +/* + * Finalize refcounts for heap elements just about to be freed. + * This must be done for all objects before freeing to avoid any + * stale pointer dereferences. + * + * Note that this must deduce the set of objects to be freed + * identically to duk__sweep_heap(). + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) +DUK_LOCAL void duk__finalize_refcounts(duk_heap *heap) { + duk_heaphdr *hdr; + + DUK_ASSERT(heap->heap_thread != NULL); + + DUK_DD(DUK_DDPRINT("duk__finalize_refcounts: heap=%p", (void *) heap)); + + hdr = heap->heap_allocated; + while (hdr) { + if (!DUK_HEAPHDR_HAS_REACHABLE(hdr)) { + /* + * Unreachable object about to be swept. Finalize target refcounts + * (objects which the unreachable object points to) without doing + * refzero processing. Recursive decrefs are also prevented when + * refzero processing is disabled. + * + * Value cannot be a finalizable object, as they have been made + * temporarily reachable for this round. + */ + + DUK_DDD(DUK_DDDPRINT("unreachable object, refcount finalize before sweeping: %p", (void *) hdr)); + + /* Finalize using heap->heap_thread; DECREF has a + * suppress check for mark-and-sweep which is based + * on heap->ms_running. + */ + duk_heaphdr_refcount_finalize_norz(heap, hdr); + } + + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } +} +#endif /* DUK_USE_REFERENCE_COUNTING */ + +/* + * Clear (reachable) flags of finalize_list. + * + * We could mostly do in the sweep phase when we move objects from the + * heap into the finalize_list. However, if a finalizer run is skipped + * during a mark-and-sweep, the objects on the finalize_list will be marked + * reachable during the next mark-and-sweep. Since they're already on the + * finalize_list, no-one will be clearing their REACHABLE flag so we do it + * here. (This now overlaps with the sweep handling in a harmless way.) + */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_LOCAL void duk__clear_finalize_list_flags(duk_heap *heap) { + duk_heaphdr *hdr; + + DUK_DD(DUK_DDPRINT("duk__clear_finalize_list_flags: %p", (void *) heap)); + + hdr = heap->finalize_list; + while (hdr) { + DUK_HEAPHDR_CLEAR_REACHABLE(hdr); +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(DUK_HEAPHDR_HAS_FINALIZABLE(hdr) || \ + (heap->currently_finalizing == hdr)); +#endif + /* DUK_HEAPHDR_FLAG_FINALIZED may be set. */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_TEMPROOT(hdr)); + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +/* + * Sweep stringtable. + */ + +DUK_LOCAL void duk__sweep_stringtable(duk_heap *heap, duk_size_t *out_count_keep) { + duk_hstring *h; + duk_hstring *prev; + duk_uint32_t i; +#if defined(DUK_USE_DEBUG) + duk_size_t count_free = 0; +#endif + duk_size_t count_keep = 0; + + DUK_DD(DUK_DDPRINT("duk__sweep_stringtable: %p", (void *) heap)); + +#if defined(DUK_USE_STRTAB_PTRCOMP) + if (heap->strtable16 == NULL) { +#else + if (heap->strtable == NULL) { +#endif + goto done; + } + + for (i = 0; i < heap->st_size; i++) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + h = DUK_USE_HEAPPTR_DEC16(heap->heap_udata, heap->strtable16[i]); +#else + h = heap->strtable[i]; +#endif + prev = NULL; + while (h != NULL) { + duk_hstring *next; + next = h->hdr.h_next; + + if (DUK_HEAPHDR_HAS_REACHABLE((duk_heaphdr *) h)) + { + DUK_HEAPHDR_CLEAR_REACHABLE((duk_heaphdr *) h); + count_keep++; + prev = h; + } else { +#if defined(DUK_USE_DEBUG) + count_free++; +#endif + + /* For pinned strings the refcount has been + * bumped. We could unbump it here before + * freeing, but that's actually not necessary + * except for assertions. + */ +#if 0 + if (DUK_HSTRING_HAS_PINNED_LITERAL(h)) { + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h) > 0U); + DUK_HSTRING_DECREF_NORZ(heap->heap_thread, h); + DUK_HSTRING_CLEAR_PINNED_LITERAL(h); + } +#endif +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Non-zero refcounts should not happen for unreachable strings, + * because we refcount finalize all unreachable objects which + * should have decreased unreachable string refcounts to zero + * (even for cycles). However, pinned strings have a +1 bump. + */ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h) == + DUK_HSTRING_HAS_PINNED_LITERAL(h) ? 1U : 0U); +#endif + + /* Deal with weak references first. */ + duk_heap_strcache_string_remove(heap, (duk_hstring *) h); + + /* Remove the string from the string table. */ + duk_heap_strtable_unlink_prev(heap, (duk_hstring *) h, (duk_hstring *) prev); + + /* Free inner references (these exist e.g. when external + * strings are enabled) and the struct itself. + */ + duk_free_hstring(heap, (duk_hstring *) h); + + /* Don't update 'prev'; it should be last string kept. */ + } + + h = next; + } + } + + done: +#if defined(DUK_USE_DEBUG) + DUK_D(DUK_DPRINT("mark-and-sweep sweep stringtable: %ld freed, %ld kept", + (long) count_free, (long) count_keep)); +#endif + *out_count_keep = count_keep; +} + +/* + * Sweep heap. + */ + +DUK_LOCAL void duk__sweep_heap(duk_heap *heap, duk_small_uint_t flags, duk_size_t *out_count_keep) { + duk_heaphdr *prev; /* last element that was left in the heap */ + duk_heaphdr *curr; + duk_heaphdr *next; +#if defined(DUK_USE_DEBUG) + duk_size_t count_free = 0; + duk_size_t count_finalize = 0; + duk_size_t count_rescue = 0; +#endif + duk_size_t count_keep = 0; + + DUK_DD(DUK_DDPRINT("duk__sweep_heap: %p", (void *) heap)); + + prev = NULL; + curr = heap->heap_allocated; + heap->heap_allocated = NULL; + while (curr) { + /* Strings and ROM objects are never placed on the heap allocated list. */ + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(curr) != DUK_HTYPE_STRING); + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY(curr)); + + next = DUK_HEAPHDR_GET_NEXT(heap, curr); + + if (DUK_HEAPHDR_HAS_REACHABLE(curr)) { + /* + * Reachable object: + * - If FINALIZABLE -> actually unreachable (but marked + * artificially reachable), queue to finalize_list. + * - If !FINALIZABLE but FINALIZED -> rescued after + * finalizer execution. + * - Otherwise just a normal, reachable object. + * + * Objects which are kept are queued to heap_allocated + * tail (we're essentially filtering heap_allocated in + * practice). + */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) + if (DUK_UNLIKELY(DUK_HEAPHDR_HAS_FINALIZABLE(curr))) { + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZED(curr)); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(curr) == DUK_HTYPE_OBJECT); + DUK_DD(DUK_DDPRINT("sweep; reachable, finalizable --> move to finalize_list: %p", (void *) curr)); + +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_HEAPHDR_PREINC_REFCOUNT(curr); /* Bump refcount so that refzero never occurs when pending a finalizer call. */ +#endif + DUK_HEAP_INSERT_INTO_FINALIZE_LIST(heap, curr); +#if defined(DUK_USE_DEBUG) + count_finalize++; +#endif + } + else +#endif /* DUK_USE_FINALIZER_SUPPORT */ + { + if (DUK_UNLIKELY(DUK_HEAPHDR_HAS_FINALIZED(curr))) { + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZABLE(curr)); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(curr) == DUK_HTYPE_OBJECT); + + if (flags & DUK_MS_FLAG_POSTPONE_RESCUE) { + DUK_DD(DUK_DDPRINT("sweep; reachable, finalized, but postponing rescue decisions --> keep object (with FINALIZED set): %!iO", curr)); + count_keep++; + } else { + DUK_DD(DUK_DDPRINT("sweep; reachable, finalized --> rescued after finalization: %p", (void *) curr)); +#if defined(DUK_USE_FINALIZER_SUPPORT) + DUK_HEAPHDR_CLEAR_FINALIZED(curr); +#endif +#if defined(DUK_USE_DEBUG) + count_rescue++; +#endif + } + } else { + DUK_DD(DUK_DDPRINT("sweep; reachable --> keep: %!iO", curr)); + count_keep++; + } + + if (prev != NULL) { + DUK_ASSERT(heap->heap_allocated != NULL); + DUK_HEAPHDR_SET_NEXT(heap, prev, curr); + } else { + DUK_ASSERT(heap->heap_allocated == NULL); + heap->heap_allocated = curr; + } +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) + DUK_HEAPHDR_SET_PREV(heap, curr, prev); +#endif + DUK_ASSERT_HEAPHDR_LINKS(heap, prev); + DUK_ASSERT_HEAPHDR_LINKS(heap, curr); + prev = curr; + } + + /* + * Shrink check for value stacks here. We're inside + * ms_prevent_count protection which prevents recursive + * mark-and-sweep and refzero finalizers, so there are + * no side effects that would affect the heap lists. + */ + if (DUK_HEAPHDR_IS_OBJECT(curr) && DUK_HOBJECT_IS_THREAD((duk_hobject *) curr)) { + duk_hthread *thr_curr = (duk_hthread *) curr; + DUK_DD(DUK_DDPRINT("value stack shrink check for thread: %!O", curr)); + duk_valstack_shrink_check_nothrow(thr_curr, flags & DUK_MS_FLAG_EMERGENCY /*snug*/); + } + + DUK_HEAPHDR_CLEAR_REACHABLE(curr); + /* Keep FINALIZED if set, used if rescue decisions are postponed. */ + /* Keep FINALIZABLE for objects on finalize_list. */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_REACHABLE(curr)); + } else { + /* + * Unreachable object: + * - If FINALIZED, object was finalized but not + * rescued. This doesn't affect freeing. + * - Otherwise normal unreachable object. + * + * There's no guard preventing a FINALIZED object + * from being freed while finalizers execute: the + * artificial finalize_list reachability roots can't + * cause an incorrect free decision (but can cause + * an incorrect rescue decision). + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Non-zero refcounts should not happen because we refcount + * finalize all unreachable objects which should cancel out + * refcounts (even for cycles). + */ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(curr) == 0); +#endif + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZABLE(curr)); + +#if defined(DUK_USE_DEBUG) + if (DUK_HEAPHDR_HAS_FINALIZED(curr)) { + DUK_DD(DUK_DDPRINT("sweep; unreachable, finalized --> finalized object not rescued: %p", (void *) curr)); + } else { + DUK_DD(DUK_DDPRINT("sweep; not reachable --> free: %p", (void *) curr)); + } + +#endif + + /* Note: object cannot be a finalizable unreachable object, as + * they have been marked temporarily reachable for this round, + * and are handled above. + */ + +#if defined(DUK_USE_DEBUG) + count_free++; +#endif + + /* Weak refs should be handled here, but no weak refs for + * any non-string objects exist right now. + */ + + /* Free object and all auxiliary (non-heap) allocs. */ + duk_heap_free_heaphdr_raw(heap, curr); + } + + curr = next; + } + + if (prev != NULL) { + DUK_HEAPHDR_SET_NEXT(heap, prev, NULL); + } + DUK_ASSERT_HEAPHDR_LINKS(heap, prev); + +#if defined(DUK_USE_DEBUG) + DUK_D(DUK_DPRINT("mark-and-sweep sweep objects (non-string): %ld freed, %ld kept, %ld rescued, %ld queued for finalization", + (long) count_free, (long) count_keep, (long) count_rescue, (long) count_finalize)); +#endif + *out_count_keep = count_keep; +} + +/* + * Litcache helpers. + */ + +#if defined(DUK_USE_LITCACHE_SIZE) +DUK_LOCAL void duk__wipe_litcache(duk_heap *heap) { + duk_uint_t i; + duk_litcache_entry *e; + + e = heap->litcache; + for (i = 0; i < DUK_USE_LITCACHE_SIZE; i++) { + e->addr = NULL; + /* e->h does not need to be invalidated: when e->addr is + * NULL, e->h is considered garbage. + */ + e++; + } +} +#endif /* DUK_USE_LITCACHE_SIZE */ + +/* + * Object compaction. + * + * Compaction is assumed to never throw an error. + */ + +DUK_LOCAL int duk__protected_compact_object(duk_hthread *thr, void *udata) { + duk_hobject *obj; + /* XXX: for threads, compact stacks? */ + + DUK_UNREF(udata); + obj = duk_known_hobject(thr, -1); + duk_hobject_compact_props(thr, obj); + return 0; +} + +#if defined(DUK_USE_DEBUG) +DUK_LOCAL void duk__compact_object_list(duk_heap *heap, duk_hthread *thr, duk_heaphdr *start, duk_size_t *p_count_check, duk_size_t *p_count_compact, duk_size_t *p_count_bytes_saved) { +#else +DUK_LOCAL void duk__compact_object_list(duk_heap *heap, duk_hthread *thr, duk_heaphdr *start) { +#endif + duk_heaphdr *curr; +#if defined(DUK_USE_DEBUG) + duk_size_t old_size, new_size; +#endif + duk_hobject *obj; + + DUK_UNREF(heap); + + curr = start; + while (curr) { + DUK_DDD(DUK_DDDPRINT("mark-and-sweep compact: %p", (void *) curr)); + + if (DUK_HEAPHDR_GET_TYPE(curr) != DUK_HTYPE_OBJECT) { + goto next; + } + obj = (duk_hobject *) curr; + +#if defined(DUK_USE_DEBUG) + old_size = DUK_HOBJECT_P_COMPUTE_SIZE(DUK_HOBJECT_GET_ESIZE(obj), + DUK_HOBJECT_GET_ASIZE(obj), + DUK_HOBJECT_GET_HSIZE(obj)); +#endif + + DUK_DD(DUK_DDPRINT("compact object: %p", (void *) obj)); + duk_push_hobject(thr, obj); + /* XXX: disable error handlers for duration of compaction? */ + duk_safe_call(thr, duk__protected_compact_object, NULL, 1, 0); + +#if defined(DUK_USE_DEBUG) + new_size = DUK_HOBJECT_P_COMPUTE_SIZE(DUK_HOBJECT_GET_ESIZE(obj), + DUK_HOBJECT_GET_ASIZE(obj), + DUK_HOBJECT_GET_HSIZE(obj)); +#endif + +#if defined(DUK_USE_DEBUG) + (*p_count_compact)++; + (*p_count_bytes_saved) += (duk_size_t) (old_size - new_size); +#endif + + next: + curr = DUK_HEAPHDR_GET_NEXT(heap, curr); +#if defined(DUK_USE_DEBUG) + (*p_count_check)++; +#endif + } +} + +DUK_LOCAL void duk__compact_objects(duk_heap *heap) { + /* XXX: which lists should participate? to be finalized? */ +#if defined(DUK_USE_DEBUG) + duk_size_t count_check = 0; + duk_size_t count_compact = 0; + duk_size_t count_bytes_saved = 0; +#endif + + DUK_DD(DUK_DDPRINT("duk__compact_objects: %p", (void *) heap)); + + DUK_ASSERT(heap->heap_thread != NULL); + +#if defined(DUK_USE_DEBUG) + duk__compact_object_list(heap, heap->heap_thread, heap->heap_allocated, &count_check, &count_compact, &count_bytes_saved); +#if defined(DUK_USE_FINALIZER_SUPPORT) + duk__compact_object_list(heap, heap->heap_thread, heap->finalize_list, &count_check, &count_compact, &count_bytes_saved); +#endif +#else + duk__compact_object_list(heap, heap->heap_thread, heap->heap_allocated); +#if defined(DUK_USE_FINALIZER_SUPPORT) + duk__compact_object_list(heap, heap->heap_thread, heap->finalize_list); +#endif +#endif +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* Always handled to completion inline in DECREF. */ +#endif + +#if defined(DUK_USE_DEBUG) + DUK_D(DUK_DPRINT("mark-and-sweep compact objects: %ld checked, %ld compaction attempts, %ld bytes saved by compaction", + (long) count_check, (long) count_compact, (long) count_bytes_saved)); +#endif +} + +/* + * Assertion helpers. + */ + +#if defined(DUK_USE_ASSERTIONS) +DUK_LOCAL void duk__assert_heaphdr_flags(duk_heap *heap) { + duk_heaphdr *hdr; + + hdr = heap->heap_allocated; + while (hdr) { + DUK_ASSERT(!DUK_HEAPHDR_HAS_REACHABLE(hdr)); + DUK_ASSERT(!DUK_HEAPHDR_HAS_TEMPROOT(hdr)); + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZABLE(hdr)); + /* may have FINALIZED */ + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } + +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* Always handled to completion inline in DECREF. */ +#endif +} + +#if defined(DUK_USE_REFERENCE_COUNTING) +DUK_LOCAL void duk__assert_valid_refcounts(duk_heap *heap) { + duk_heaphdr *hdr = heap->heap_allocated; + while (hdr) { + /* Cannot really assert much w.r.t. refcounts now. */ + + if (DUK_HEAPHDR_GET_REFCOUNT(hdr) == 0 && + DUK_HEAPHDR_HAS_FINALIZED(hdr)) { + /* An object may be in heap_allocated list with a zero + * refcount if it has just been finalized and is waiting + * to be collected by the next cycle. + * (This doesn't currently happen however.) + */ + } else if (DUK_HEAPHDR_GET_REFCOUNT(hdr) == 0) { + /* An object may be in heap_allocated list with a zero + * refcount also if it is a temporary object created + * during debugger paused state. It will get collected + * by mark-and-sweep based on its reachability status + * (presumably not reachable because refcount is 0). + */ + } + DUK_ASSERT_DISABLE(DUK_HEAPHDR_GET_REFCOUNT(hdr) >= 0); /* Unsigned. */ + hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr); + } +} + +DUK_LOCAL void duk__clear_assert_refcounts(duk_heap *heap) { + duk_heaphdr *curr; + duk_uint32_t i; + + for (curr = heap->heap_allocated; curr != NULL; curr = DUK_HEAPHDR_GET_NEXT(heap, curr)) { + curr->h_assert_refcount = 0; + } +#if defined(DUK_USE_FINALIZER_SUPPORT) + for (curr = heap->finalize_list; curr != NULL; curr = DUK_HEAPHDR_GET_NEXT(heap, curr)) { + curr->h_assert_refcount = 0; + } +#endif +#if defined(DUK_USE_REFERENCE_COUNTING) + for (curr = heap->refzero_list; curr != NULL; curr = DUK_HEAPHDR_GET_NEXT(heap, curr)) { + curr->h_assert_refcount = 0; + } +#endif + + for (i = 0; i < heap->st_size; i++) { + duk_hstring *h; + +#if defined(DUK_USE_STRTAB_PTRCOMP) + h = DUK_USE_HEAPPTR_DEC16(heap->heap_udata, heap->strtable16[i]); +#else + h = heap->strtable[i]; +#endif + while (h != NULL) { + ((duk_heaphdr *) h)->h_assert_refcount = 0; + h = h->hdr.h_next; + } + } +} + +DUK_LOCAL void duk__check_refcount_heaphdr(duk_heaphdr *hdr) { + duk_bool_t count_ok; + duk_size_t expect_refc; + + /* The refcount check only makes sense for reachable objects on + * heap_allocated or string table, after the sweep phase. Prior to + * sweep phase refcounts will include references that are not visible + * via reachability roots. + * + * Because we're called after the sweep phase, all heap objects on + * heap_allocated are reachable. REACHABLE flags have already been + * cleared so we can't check them. + */ + + /* ROM objects have intentionally incorrect refcount (1), but we won't + * check them. + */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY(hdr)); + + expect_refc = hdr->h_assert_refcount; + if (DUK_HEAPHDR_IS_STRING(hdr) && DUK_HSTRING_HAS_PINNED_LITERAL((duk_hstring *) hdr)) { + expect_refc++; + } + count_ok = ((duk_size_t) DUK_HEAPHDR_GET_REFCOUNT(hdr) == expect_refc); + if (!count_ok) { + DUK_D(DUK_DPRINT("refcount mismatch for: %p: header=%ld counted=%ld --> %!iO", + (void *) hdr, (long) DUK_HEAPHDR_GET_REFCOUNT(hdr), + (long) hdr->h_assert_refcount, hdr)); + DUK_ASSERT(0); + } +} + +DUK_LOCAL void duk__check_assert_refcounts(duk_heap *heap) { + duk_heaphdr *curr; + duk_uint32_t i; + + for (curr = heap->heap_allocated; curr != NULL; curr = DUK_HEAPHDR_GET_NEXT(heap, curr)) { + duk__check_refcount_heaphdr(curr); + } +#if defined(DUK_USE_FINALIZER_SUPPORT) + for (curr = heap->finalize_list; curr != NULL; curr = DUK_HEAPHDR_GET_NEXT(heap, curr)) { + duk__check_refcount_heaphdr(curr); + } +#endif + + for (i = 0; i < heap->st_size; i++) { + duk_hstring *h; + +#if defined(DUK_USE_STRTAB_PTRCOMP) + h = DUK_USE_HEAPPTR_DEC16(heap->heap_udata, heap->strtable16[i]); +#else + h = heap->strtable[i]; +#endif + while (h != NULL) { + duk__check_refcount_heaphdr((duk_heaphdr *) h); + h = h->hdr.h_next; + } + } +} +#endif /* DUK_USE_REFERENCE_COUNTING */ + +#if defined(DUK_USE_LITCACHE_SIZE) +DUK_LOCAL void duk__assert_litcache_nulls(duk_heap *heap) { + duk_uint_t i; + duk_litcache_entry *e; + + e = heap->litcache; + for (i = 0; i < DUK_USE_LITCACHE_SIZE; i++) { + /* Entry addresses were NULLed before mark-and-sweep, check + * that they're still NULL afterwards to ensure no pointers + * were recorded through any side effects. + */ + DUK_ASSERT(e->addr == NULL); + } +} +#endif /* DUK_USE_LITCACHE_SIZE */ +#endif /* DUK_USE_ASSERTIONS */ + +/* + * Stats dump. + */ + +#if defined(DUK_USE_DEBUG) +DUK_LOCAL void duk__dump_stats(duk_heap *heap) { + DUK_D(DUK_DPRINT("stats executor: opcodes=%ld, interrupt=%ld, throw=%ld", + (long) heap->stats_exec_opcodes, (long) heap->stats_exec_interrupt, + (long) heap->stats_exec_throw)); + DUK_D(DUK_DPRINT("stats call: all=%ld, tailcall=%ld, ecmatoecma=%ld", + (long) heap->stats_call_all, (long) heap->stats_call_tailcall, + (long) heap->stats_call_ecmatoecma)); + DUK_D(DUK_DPRINT("stats safecall: all=%ld, nothrow=%ld, throw=%ld", + (long) heap->stats_safecall_all, (long) heap->stats_safecall_nothrow, + (long) heap->stats_safecall_throw)); + DUK_D(DUK_DPRINT("stats mark-and-sweep: try_count=%ld, skip_count=%ld, emergency_count=%ld", + (long) heap->stats_ms_try_count, (long) heap->stats_ms_skip_count, + (long) heap->stats_ms_emergency_count)); + DUK_D(DUK_DPRINT("stats stringtable: intern_hit=%ld, intern_miss=%ld, " + "resize_check=%ld, resize_grow=%ld, resize_shrink=%ld, " + "litcache_hit=%ld, litcache_miss=%ld, litcache_pin=%ld", + (long) heap->stats_strtab_intern_hit, (long) heap->stats_strtab_intern_miss, + (long) heap->stats_strtab_resize_check, (long) heap->stats_strtab_resize_grow, + (long) heap->stats_strtab_resize_shrink, (long) heap->stats_strtab_litcache_hit, + (long) heap->stats_strtab_litcache_miss, (long) heap->stats_strtab_litcache_pin)); + DUK_D(DUK_DPRINT("stats object: realloc_props=%ld, abandon_array=%ld", + (long) heap->stats_object_realloc_props, (long) heap->stats_object_abandon_array)); + DUK_D(DUK_DPRINT("stats getownpropdesc: count=%ld, hit=%ld, miss=%ld", + (long) heap->stats_getownpropdesc_count, (long) heap->stats_getownpropdesc_hit, + (long) heap->stats_getownpropdesc_miss)); + DUK_D(DUK_DPRINT("stats getpropdesc: count=%ld, hit=%ld, miss=%ld", + (long) heap->stats_getpropdesc_count, (long) heap->stats_getpropdesc_hit, + (long) heap->stats_getpropdesc_miss)); + DUK_D(DUK_DPRINT("stats getprop: all=%ld, arrayidx=%ld, bufobjidx=%ld, " + "bufferidx=%ld, bufferlen=%ld, stringidx=%ld, stringlen=%ld, " + "proxy=%ld, arguments=%ld", + (long) heap->stats_getprop_all, (long) heap->stats_getprop_arrayidx, + (long) heap->stats_getprop_bufobjidx, (long) heap->stats_getprop_bufferidx, + (long) heap->stats_getprop_bufferlen, (long) heap->stats_getprop_stringidx, + (long) heap->stats_getprop_stringlen, (long) heap->stats_getprop_proxy, + (long) heap->stats_getprop_arguments)); + DUK_D(DUK_DPRINT("stats putprop: all=%ld, arrayidx=%ld, bufobjidx=%ld, " + "bufferidx=%ld, proxy=%ld", + (long) heap->stats_putprop_all, (long) heap->stats_putprop_arrayidx, + (long) heap->stats_putprop_bufobjidx, (long) heap->stats_putprop_bufferidx, + (long) heap->stats_putprop_proxy)); + DUK_D(DUK_DPRINT("stats getvar: all=%ld", + (long) heap->stats_getvar_all)); + DUK_D(DUK_DPRINT("stats putvar: all=%ld", + (long) heap->stats_putvar_all)); +} +#endif /* DUK_USE_DEBUG */ + +/* + * Main mark-and-sweep function. + * + * 'flags' represents the features requested by the caller. The current + * heap->ms_base_flags is ORed automatically into the flags; the base flags + * mask typically prevents certain mark-and-sweep operation to avoid trouble. + */ + +DUK_INTERNAL void duk_heap_mark_and_sweep(duk_heap *heap, duk_small_uint_t flags) { + duk_size_t count_keep_obj; + duk_size_t count_keep_str; +#if defined(DUK_USE_VOLUNTARY_GC) + duk_size_t tmp; +#endif + + DUK_STATS_INC(heap, stats_ms_try_count); +#if defined(DUK_USE_DEBUG) + if (flags & DUK_MS_FLAG_EMERGENCY) { + DUK_STATS_INC(heap, stats_ms_emergency_count); + } +#endif + + /* If debugger is paused, garbage collection is disabled by default. + * This is achieved by bumping ms_prevent_count when becoming paused. + */ + DUK_ASSERT(!DUK_HEAP_HAS_DEBUGGER_PAUSED(heap) || heap->ms_prevent_count > 0); + + /* Prevention/recursion check as soon as possible because we may + * be called a number of times when voluntary mark-and-sweep is + * pending. + */ + if (heap->ms_prevent_count != 0) { + DUK_DD(DUK_DDPRINT("reject recursive mark-and-sweep")); + DUK_STATS_INC(heap, stats_ms_skip_count); + return; + } + DUK_ASSERT(heap->ms_running == 0); /* ms_prevent_count is bumped when ms_running is set */ + + /* Heap_thread is used during mark-and-sweep for refcount finalization + * (it's also used for finalizer execution once mark-and-sweep is + * complete). Heap allocation code ensures heap_thread is set and + * properly initialized before setting ms_prevent_count to 0. + */ + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(heap->heap_thread->valstack != NULL); + + DUK_D(DUK_DPRINT("garbage collect (mark-and-sweep) starting, requested flags: 0x%08lx, effective flags: 0x%08lx", + (unsigned long) flags, (unsigned long) (flags | heap->ms_base_flags))); + + flags |= heap->ms_base_flags; +#if defined(DUK_USE_FINALIZER_SUPPORT) + if (heap->finalize_list != NULL) { + flags |= DUK_MS_FLAG_POSTPONE_RESCUE; + } +#endif + + /* + * Assertions before + */ + +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(heap->ms_prevent_count == 0); + DUK_ASSERT(heap->ms_running == 0); + DUK_ASSERT(!DUK_HEAP_HAS_DEBUGGER_PAUSED(heap)); + DUK_ASSERT(!DUK_HEAP_HAS_MARKANDSWEEP_RECLIMIT_REACHED(heap)); + DUK_ASSERT(heap->ms_recursion_depth == 0); + duk__assert_heaphdr_flags(heap); +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Note: heap->refzero_free_running may be true; a refcount + * finalizer may trigger a mark-and-sweep. + */ + duk__assert_valid_refcounts(heap); +#endif /* DUK_USE_REFERENCE_COUNTING */ +#endif /* DUK_USE_ASSERTIONS */ + + /* + * Begin + */ + + DUK_ASSERT(heap->ms_prevent_count == 0); + DUK_ASSERT(heap->ms_running == 0); + heap->ms_prevent_count = 1; + heap->ms_running = 1; + + /* + * Free activation/catcher freelists on every mark-and-sweep for now. + * This is an initial rough draft; ideally we'd keep count of the + * freelist size and free only excess entries. + */ + + DUK_D(DUK_DPRINT("freeing temporary freelists")); + duk_heap_free_freelists(heap); + + /* + * Mark roots, hoping that recursion limit is not normally hit. + * If recursion limit is hit, run additional reachability rounds + * starting from "temproots" until marking is complete. + * + * Marking happens in two phases: first we mark actual reachability + * roots (and run "temproots" to complete the process). Then we + * check which objects are unreachable and are finalizable; such + * objects are marked as FINALIZABLE and marked as reachability + * (and "temproots" is run again to complete the process). + * + * The heap finalize_list must also be marked as a reachability root. + * There may be objects on the list from a previous round if the + * previous run had finalizer skip flag. + */ + +#if defined(DUK_USE_ASSERTIONS) && defined(DUK_USE_REFERENCE_COUNTING) + duk__clear_assert_refcounts(heap); +#endif +#if defined(DUK_USE_LITCACHE_SIZE) + duk__wipe_litcache(heap); +#endif + duk__mark_roots_heap(heap); /* Mark main reachability roots. */ +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* Always handled to completion inline in DECREF. */ +#endif + duk__mark_temproots_by_heap_scan(heap); /* Temproots. */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) + duk__mark_finalizable(heap); /* Mark finalizable as reachability roots. */ + duk__mark_finalize_list(heap); /* Mark finalizer work list as reachability roots. */ +#endif + duk__mark_temproots_by_heap_scan(heap); /* Temproots. */ + + /* + * Sweep garbage and remove marking flags, and move objects with + * finalizers to the finalizer work list. + * + * Objects to be swept need to get their refcounts finalized before + * they are swept. In other words, their target object refcounts + * need to be decreased. This has to be done before freeing any + * objects to avoid decref'ing dangling pointers (which may happen + * even without bugs, e.g. with reference loops) + * + * Because strings don't point to other heap objects, similar + * finalization is not necessary for strings. + */ + + /* XXX: more emergency behavior, e.g. find smaller hash sizes etc */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + duk__finalize_refcounts(heap); +#endif + duk__sweep_heap(heap, flags, &count_keep_obj); + duk__sweep_stringtable(heap, &count_keep_str); +#if defined(DUK_USE_ASSERTIONS) && defined(DUK_USE_REFERENCE_COUNTING) + duk__check_assert_refcounts(heap); +#endif +#if defined(DUK_USE_REFERENCE_COUNTING) + DUK_ASSERT(heap->refzero_list == NULL); /* Always handled to completion inline in DECREF. */ +#endif +#if defined(DUK_USE_FINALIZER_SUPPORT) + duk__clear_finalize_list_flags(heap); +#endif + + /* + * Object compaction (emergency only). + * + * Object compaction is a separate step after sweeping, as there is + * more free memory for it to work with. Also, currently compaction + * may insert new objects into the heap allocated list and the string + * table which we don't want to do during a sweep (the reachability + * flags of such objects would be incorrect). The objects inserted + * are currently: + * + * - a temporary duk_hbuffer for a new properties allocation + * - if array part is abandoned, string keys are interned + * + * The object insertions go to the front of the list, so they do not + * cause an infinite loop (they are not compacted). + */ + + if ((flags & DUK_MS_FLAG_EMERGENCY) && + !(flags & DUK_MS_FLAG_NO_OBJECT_COMPACTION)) { + duk__compact_objects(heap); + } + + /* + * String table resize check. + * + * This is mainly useful in emergency GC: if the string table load + * factor is really low for some reason, we can shrink the string + * table to a smaller size and free some memory in the process. + * Only execute in emergency GC. String table has internal flags + * to protect against recursive resizing if this mark-and-sweep pass + * was triggered by a string table resize. + */ + + if (flags & DUK_MS_FLAG_EMERGENCY) { + DUK_D(DUK_DPRINT("stringtable resize check in emergency gc")); + duk_heap_strtable_force_resize(heap); + } + + /* + * Finish + */ + + DUK_ASSERT(heap->ms_prevent_count == 1); + heap->ms_prevent_count = 0; + DUK_ASSERT(heap->ms_running == 1); + heap->ms_running = 0; + + /* + * Assertions after + */ + +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(heap->ms_prevent_count == 0); + DUK_ASSERT(!DUK_HEAP_HAS_MARKANDSWEEP_RECLIMIT_REACHED(heap)); + DUK_ASSERT(heap->ms_recursion_depth == 0); + duk__assert_heaphdr_flags(heap); +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Note: heap->refzero_free_running may be true; a refcount + * finalizer may trigger a mark-and-sweep. + */ + duk__assert_valid_refcounts(heap); +#endif /* DUK_USE_REFERENCE_COUNTING */ +#if defined(DUK_USE_LITCACHE_SIZE) + duk__assert_litcache_nulls(heap); +#endif /* DUK_USE_LITCACHE_SIZE */ +#endif /* DUK_USE_ASSERTIONS */ + + /* + * Reset trigger counter + */ + +#if defined(DUK_USE_VOLUNTARY_GC) + tmp = (count_keep_obj + count_keep_str) / 256; + heap->ms_trigger_counter = (duk_int_t) ( + (tmp * DUK_HEAP_MARK_AND_SWEEP_TRIGGER_MULT) + + DUK_HEAP_MARK_AND_SWEEP_TRIGGER_ADD); + DUK_D(DUK_DPRINT("garbage collect (mark-and-sweep) finished: %ld objects kept, %ld strings kept, trigger reset to %ld", + (long) count_keep_obj, (long) count_keep_str, (long) heap->ms_trigger_counter)); +#else + DUK_D(DUK_DPRINT("garbage collect (mark-and-sweep) finished: %ld objects kept, %ld strings kept, no voluntary trigger", + (long) count_keep_obj, (long) count_keep_str)); +#endif + + /* + * Stats dump + */ + +#if defined(DUK_USE_DEBUG) + duk__dump_stats(heap); +#endif + + /* + * Finalize objects in the finalization work list. Finalized + * objects are queued back to heap_allocated with FINALIZED set. + * + * Since finalizers may cause arbitrary side effects, they are + * prevented e.g. during string table and object property allocation + * resizing using heap->pf_prevent_count. In this case the objects + * remain in the finalization work list after mark-and-sweep exits + * and they may be finalized on the next pass or any DECREF checking + * for finalize_list. + * + * As of Duktape 2.1 finalization happens outside mark-and-sweep + * protection. Mark-and-sweep is allowed while the finalize_list + * is being processed, but no rescue decisions are done while the + * process is on-going. This avoids incorrect rescue decisions + * if an object is considered reachable (and thus rescued) because + * of a reference via finalize_list (which is considered a reachability + * root). When finalize_list is being processed, reachable objects + * with FINALIZED set will just keep their FINALIZED flag for later + * mark-and-sweep processing. + * + * This could also be handled (a bit better) by having a more refined + * notion of reachability for rescue/free decisions. + * + * XXX: avoid finalizer execution when doing emergency GC? + */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) + /* Attempt to process finalize_list, pf_prevent_count check + * is inside the target. + */ + duk_heap_process_finalize_list(heap); +#endif /* DUK_USE_FINALIZER_SUPPORT */ +} +#line 1 "duk_heap_memory.c" +/* + * Memory allocation handling. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Voluntary GC check + */ + +#if defined(DUK_USE_VOLUNTARY_GC) +DUK_LOCAL DUK_INLINE void duk__check_voluntary_gc(duk_heap *heap) { + if (DUK_UNLIKELY(--(heap)->ms_trigger_counter < 0)) { +#if defined(DUK_USE_DEBUG) + if (heap->ms_prevent_count == 0) { + DUK_D(DUK_DPRINT("triggering voluntary mark-and-sweep")); + } else { + DUK_DD(DUK_DDPRINT("gc blocked -> skip voluntary mark-and-sweep now")); + } +#endif + + /* Prevention checks in the call target handle cases where + * voluntary GC is not allowed. The voluntary GC trigger + * counter is only rewritten if mark-and-sweep actually runs. + */ + duk_heap_mark_and_sweep(heap, DUK_MS_FLAG_VOLUNTARY /*flags*/); + } +} +#define DUK__VOLUNTARY_PERIODIC_GC(heap) do { duk__check_voluntary_gc((heap)); } while (0) +#else +#define DUK__VOLUNTARY_PERIODIC_GC(heap) /* no voluntary gc */ +#endif /* DUK_USE_VOLUNTARY_GC */ + +/* + * Allocate memory with garbage collection + */ + +DUK_INTERNAL void *duk_heap_mem_alloc(duk_heap *heap, duk_size_t size) { + void *res; + duk_small_int_t i; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT_DISABLE(size >= 0); + + /* + * Voluntary periodic GC (if enabled) + */ + + DUK__VOLUNTARY_PERIODIC_GC(heap); + + /* + * First attempt + */ + +#if defined(DUK_USE_GC_TORTURE) + /* Simulate alloc failure on every alloc, except when mark-and-sweep + * is running. + */ + if (heap->ms_prevent_count == 0) { + DUK_DDD(DUK_DDDPRINT("gc torture enabled, pretend that first alloc attempt fails")); + res = NULL; + DUK_UNREF(res); + goto skip_attempt; + } +#endif + res = heap->alloc_func(heap->heap_udata, size); + if (DUK_LIKELY(res || size == 0)) { + /* For zero size allocations NULL is allowed. */ + return res; + } +#if defined(DUK_USE_GC_TORTURE) + skip_attempt: +#endif + + DUK_D(DUK_DPRINT("first alloc attempt failed, attempt to gc and retry")); + +#if 0 + /* + * Avoid a GC if GC is already running. This can happen at a late + * stage in a GC when we try to e.g. resize the stringtable + * or compact objects. + * + * NOTE: explicit handling isn't actually be needed: if the GC is + * not allowed, duk_heap_mark_and_sweep() will reject it for every + * attempt in the loop below, resulting in a NULL same as here. + */ + + if (heap->ms_prevent_count != 0) { + DUK_D(DUK_DPRINT("duk_heap_mem_alloc() failed, gc in progress (gc skipped), alloc size %ld", (long) size)); + return NULL; + } +#endif + + /* + * Retry with several GC attempts. Initial attempts are made without + * emergency mode; later attempts use emergency mode which minimizes + * memory allocations forcibly. + */ + + for (i = 0; i < DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT; i++) { + duk_small_uint_t flags; + + flags = 0; + if (i >= DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT - 1) { + flags |= DUK_MS_FLAG_EMERGENCY; + } + + duk_heap_mark_and_sweep(heap, flags); + + res = heap->alloc_func(heap->heap_udata, size); + if (res) { + DUK_D(DUK_DPRINT("duk_heap_mem_alloc() succeeded after gc (pass %ld), alloc size %ld", + (long) (i + 1), (long) size)); + return res; + } + } + + DUK_D(DUK_DPRINT("duk_heap_mem_alloc() failed even after gc, alloc size %ld", (long) size)); + return NULL; +} + +DUK_INTERNAL void *duk_heap_mem_alloc_zeroed(duk_heap *heap, duk_size_t size) { + void *res; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT_DISABLE(size >= 0); + + res = DUK_ALLOC(heap, size); + if (DUK_LIKELY(res != NULL)) { + duk_memzero(res, size); + } + return res; +} + +DUK_INTERNAL void *duk_heap_mem_alloc_checked(duk_hthread *thr, duk_size_t size) { + void *res; + + DUK_ASSERT(thr != NULL); + res = duk_heap_mem_alloc(thr->heap, size); + if (DUK_LIKELY(res != NULL || size == 0)) { + return res; + } + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); +} + +DUK_INTERNAL void *duk_heap_mem_alloc_checked_zeroed(duk_hthread *thr, duk_size_t size) { + void *res; + + DUK_ASSERT(thr != NULL); + res = duk_heap_mem_alloc_zeroed(thr->heap, size); + if (DUK_LIKELY(res != NULL || size == 0)) { + return res; + } + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); +} + +/* + * Reallocate memory with garbage collection + */ + +DUK_INTERNAL void *duk_heap_mem_realloc(duk_heap *heap, void *ptr, duk_size_t newsize) { + void *res; + duk_small_int_t i; + + DUK_ASSERT(heap != NULL); + /* ptr may be NULL */ + DUK_ASSERT_DISABLE(newsize >= 0); + + /* + * Voluntary periodic GC (if enabled) + */ + + DUK__VOLUNTARY_PERIODIC_GC(heap); + + /* + * First attempt + */ + +#if defined(DUK_USE_GC_TORTURE) + /* Simulate alloc failure on every realloc, except when mark-and-sweep + * is running. + */ + if (heap->ms_prevent_count == 0) { + DUK_DDD(DUK_DDDPRINT("gc torture enabled, pretend that first realloc attempt fails")); + res = NULL; + DUK_UNREF(res); + goto skip_attempt; + } +#endif + res = heap->realloc_func(heap->heap_udata, ptr, newsize); + if (DUK_LIKELY(res || newsize == 0)) { + /* For zero size allocations NULL is allowed. */ + return res; + } +#if defined(DUK_USE_GC_TORTURE) + skip_attempt: +#endif + + DUK_D(DUK_DPRINT("first realloc attempt failed, attempt to gc and retry")); + +#if 0 + /* + * Avoid a GC if GC is already running. See duk_heap_mem_alloc(). + */ + + if (heap->ms_prevent_count != 0) { + DUK_D(DUK_DPRINT("duk_heap_mem_realloc() failed, gc in progress (gc skipped), alloc size %ld", (long) newsize)); + return NULL; + } +#endif + + /* + * Retry with several GC attempts. Initial attempts are made without + * emergency mode; later attempts use emergency mode which minimizes + * memory allocations forcibly. + */ + + for (i = 0; i < DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT; i++) { + duk_small_uint_t flags; + + flags = 0; + if (i >= DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT - 1) { + flags |= DUK_MS_FLAG_EMERGENCY; + } + + duk_heap_mark_and_sweep(heap, flags); + + res = heap->realloc_func(heap->heap_udata, ptr, newsize); + if (res || newsize == 0) { + DUK_D(DUK_DPRINT("duk_heap_mem_realloc() succeeded after gc (pass %ld), alloc size %ld", + (long) (i + 1), (long) newsize)); + return res; + } + } + + DUK_D(DUK_DPRINT("duk_heap_mem_realloc() failed even after gc, alloc size %ld", (long) newsize)); + return NULL; +} + +/* + * Reallocate memory with garbage collection, using a callback to provide + * the current allocated pointer. This variant is used when a mark-and-sweep + * (e.g. finalizers) might change the original pointer. + */ + +DUK_INTERNAL void *duk_heap_mem_realloc_indirect(duk_heap *heap, duk_mem_getptr cb, void *ud, duk_size_t newsize) { + void *res; + duk_small_int_t i; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT_DISABLE(newsize >= 0); + + /* + * Voluntary periodic GC (if enabled) + */ + + DUK__VOLUNTARY_PERIODIC_GC(heap); + + /* + * First attempt + */ + +#if defined(DUK_USE_GC_TORTURE) + /* Simulate alloc failure on every realloc, except when mark-and-sweep + * is running. + */ + if (heap->ms_prevent_count == 0) { + DUK_DDD(DUK_DDDPRINT("gc torture enabled, pretend that first indirect realloc attempt fails")); + res = NULL; + DUK_UNREF(res); + goto skip_attempt; + } +#endif + res = heap->realloc_func(heap->heap_udata, cb(heap, ud), newsize); + if (DUK_LIKELY(res || newsize == 0)) { + /* For zero size allocations NULL is allowed. */ + return res; + } +#if defined(DUK_USE_GC_TORTURE) + skip_attempt: +#endif + + DUK_D(DUK_DPRINT("first indirect realloc attempt failed, attempt to gc and retry")); + +#if 0 + /* + * Avoid a GC if GC is already running. See duk_heap_mem_alloc(). + */ + + if (heap->ms_prevent_count != 0) { + DUK_D(DUK_DPRINT("duk_heap_mem_realloc_indirect() failed, gc in progress (gc skipped), alloc size %ld", (long) newsize)); + return NULL; + } +#endif + + /* + * Retry with several GC attempts. Initial attempts are made without + * emergency mode; later attempts use emergency mode which minimizes + * memory allocations forcibly. + */ + + for (i = 0; i < DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT; i++) { + duk_small_uint_t flags; + +#if defined(DUK_USE_DEBUG) + void *ptr_pre; + void *ptr_post; +#endif + +#if defined(DUK_USE_DEBUG) + ptr_pre = cb(heap, ud); +#endif + flags = 0; + if (i >= DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT - 1) { + flags |= DUK_MS_FLAG_EMERGENCY; + } + + duk_heap_mark_and_sweep(heap, flags); +#if defined(DUK_USE_DEBUG) + ptr_post = cb(heap, ud); + if (ptr_pre != ptr_post) { + DUK_DD(DUK_DDPRINT("realloc base pointer changed by mark-and-sweep: %p -> %p", + (void *) ptr_pre, (void *) ptr_post)); + } +#endif + + /* Note: key issue here is to re-lookup the base pointer on every attempt. + * The pointer being reallocated may change after every mark-and-sweep. + */ + + res = heap->realloc_func(heap->heap_udata, cb(heap, ud), newsize); + if (res || newsize == 0) { + DUK_D(DUK_DPRINT("duk_heap_mem_realloc_indirect() succeeded after gc (pass %ld), alloc size %ld", + (long) (i + 1), (long) newsize)); + return res; + } + } + + DUK_D(DUK_DPRINT("duk_heap_mem_realloc_indirect() failed even after gc, alloc size %ld", (long) newsize)); + return NULL; +} + +/* + * Free memory + */ + +DUK_INTERNAL void duk_heap_mem_free(duk_heap *heap, void *ptr) { + DUK_ASSERT(heap != NULL); + /* ptr may be NULL */ + + /* Must behave like a no-op with NULL and any pointer returned from + * malloc/realloc with zero size. + */ + heap->free_func(heap->heap_udata, ptr); + + /* Never perform a GC (even voluntary) in a memory free, otherwise + * all call sites doing frees would need to deal with the side effects. + * No need to update voluntary GC counter either. + */ +} + +/* automatic undefs */ +#undef DUK__VOLUNTARY_PERIODIC_GC +#line 1 "duk_heap_misc.c" +/* + * Support functions for duk_heap. + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL void duk_heap_insert_into_heap_allocated(duk_heap *heap, duk_heaphdr *hdr) { + duk_heaphdr *root; + + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(hdr) != DUK_HTYPE_STRING); + + root = heap->heap_allocated; +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) + if (root != NULL) { + DUK_ASSERT(DUK_HEAPHDR_GET_PREV(heap, root) == NULL); + DUK_HEAPHDR_SET_PREV(heap, root, hdr); + } + DUK_HEAPHDR_SET_PREV(heap, hdr, NULL); +#endif + DUK_HEAPHDR_SET_NEXT(heap, hdr, root); + DUK_ASSERT_HEAPHDR_LINKS(heap, hdr); + DUK_ASSERT_HEAPHDR_LINKS(heap, root); + heap->heap_allocated = hdr; +} + +#if defined(DUK_USE_REFERENCE_COUNTING) +DUK_INTERNAL void duk_heap_remove_from_heap_allocated(duk_heap *heap, duk_heaphdr *hdr) { + duk_heaphdr *prev; + duk_heaphdr *next; + + /* Strings are in string table. */ + DUK_ASSERT(hdr != NULL); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(hdr) != DUK_HTYPE_STRING); + + /* Target 'hdr' must be in heap_allocated (not e.g. finalize_list). + * If not, heap lists will become corrupted so assert early for it. + */ +#if defined(DUK_USE_ASSERTIONS) + { + duk_heaphdr *tmp; + for (tmp = heap->heap_allocated; tmp != NULL; tmp = DUK_HEAPHDR_GET_NEXT(heap, tmp)) { + if (tmp == hdr) { + break; + } + } + DUK_ASSERT(tmp == hdr); + } +#endif + + /* Read/write only once to minimize pointer compression calls. */ + prev = DUK_HEAPHDR_GET_PREV(heap, hdr); + next = DUK_HEAPHDR_GET_NEXT(heap, hdr); + + if (prev != NULL) { + DUK_ASSERT(heap->heap_allocated != hdr); + DUK_HEAPHDR_SET_NEXT(heap, prev, next); + } else { + DUK_ASSERT(heap->heap_allocated == hdr); + heap->heap_allocated = next; + } + if (next != NULL) { + DUK_HEAPHDR_SET_PREV(heap, next, prev); + } else { + ; + } +} +#endif /* DUK_USE_REFERENCE_COUNTING */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL void duk_heap_insert_into_finalize_list(duk_heap *heap, duk_heaphdr *hdr) { + duk_heaphdr *root; + + root = heap->finalize_list; +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) + DUK_HEAPHDR_SET_PREV(heap, hdr, NULL); + if (root != NULL) { + DUK_ASSERT(DUK_HEAPHDR_GET_PREV(heap, root) == NULL); + DUK_HEAPHDR_SET_PREV(heap, root, hdr); + } +#endif + DUK_HEAPHDR_SET_NEXT(heap, hdr, root); + DUK_ASSERT_HEAPHDR_LINKS(heap, hdr); + DUK_ASSERT_HEAPHDR_LINKS(heap, root); + heap->finalize_list = hdr; +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL void duk_heap_remove_from_finalize_list(duk_heap *heap, duk_heaphdr *hdr) { +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) + duk_heaphdr *next; + duk_heaphdr *prev; + + next = DUK_HEAPHDR_GET_NEXT(heap, hdr); + prev = DUK_HEAPHDR_GET_PREV(heap, hdr); + if (next != NULL) { + DUK_ASSERT(DUK_HEAPHDR_GET_PREV(heap, next) == hdr); + DUK_HEAPHDR_SET_PREV(heap, next, prev); + } + if (prev == NULL) { + DUK_ASSERT(hdr == heap->finalize_list); + heap->finalize_list = next; + } else { + DUK_ASSERT(hdr != heap->finalize_list); + DUK_HEAPHDR_SET_NEXT(heap, prev, next); + } +#else + duk_heaphdr *next; + duk_heaphdr *curr; + + /* Random removal is expensive: we need to locate the previous element + * because we don't have a 'prev' pointer. + */ + curr = heap->finalize_list; + if (curr == hdr) { + heap->finalize_list = DUK_HEAPHDR_GET_NEXT(heap, curr); + } else { + DUK_ASSERT(hdr != heap->finalize_list); + for (;;) { + DUK_ASSERT(curr != NULL); /* Caller responsibility. */ + + next = DUK_HEAPHDR_GET_NEXT(heap, curr); + if (next == hdr) { + next = DUK_HEAPHDR_GET_NEXT(heap, hdr); + DUK_HEAPHDR_SET_NEXT(heap, curr, next); + break; + } + } + } +#endif +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +#if defined(DUK_USE_ASSERTIONS) +DUK_INTERNAL duk_bool_t duk_heap_in_heap_allocated(duk_heap *heap, duk_heaphdr *ptr) { + duk_heaphdr *curr; + DUK_ASSERT(heap != NULL); + + for (curr = heap->heap_allocated; curr != NULL; curr = DUK_HEAPHDR_GET_NEXT(heap, curr)) { + if (curr == ptr) { + return 1; + } + } + return 0; +} +#endif /* DUK_USE_ASSERTIONS */ + +#if defined(DUK_USE_INTERRUPT_COUNTER) +DUK_INTERNAL void duk_heap_switch_thread(duk_heap *heap, duk_hthread *new_thr) { + duk_hthread *curr_thr; + + DUK_ASSERT(heap != NULL); + + if (new_thr != NULL) { + curr_thr = heap->curr_thread; + if (curr_thr == NULL) { + /* For initial entry use default value; zero forces an + * interrupt before executing the first insturction. + */ + DUK_DD(DUK_DDPRINT("switch thread, initial entry, init default interrupt counter")); + new_thr->interrupt_counter = 0; + new_thr->interrupt_init = 0; + } else { + /* Copy interrupt counter/init value state to new thread (if any). + * It's OK for new_thr to be the same as curr_thr. + */ +#if defined(DUK_USE_DEBUG) + if (new_thr != curr_thr) { + DUK_DD(DUK_DDPRINT("switch thread, not initial entry, copy interrupt counter")); + } +#endif + new_thr->interrupt_counter = curr_thr->interrupt_counter; + new_thr->interrupt_init = curr_thr->interrupt_init; + } + } else { + DUK_DD(DUK_DDPRINT("switch thread, new thread is NULL, no interrupt counter changes")); + } + + heap->curr_thread = new_thr; /* may be NULL */ +} +#endif /* DUK_USE_INTERRUPT_COUNTER */ +#line 1 "duk_heap_refcount.c" +/* + * Reference counting implementation. + * + * INCREF/DECREF, finalization and freeing of objects whose refcount reaches + * zero (refzero). These operations are very performance sensitive, so + * various small tricks are used in an attempt to maximize speed. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_REFERENCE_COUNTING) + +#if !defined(DUK_USE_DOUBLE_LINKED_HEAP) +#error internal error, reference counting requires a double linked heap +#endif + +/* + * Heap object refcount finalization. + * + * When an object is about to be freed, all other objects it refers to must + * be decref'd. Refcount finalization does NOT free the object or its inner + * allocations (mark-and-sweep shares these helpers), it just manipulates + * the refcounts. + * + * Note that any of the DECREFs may cause a refcount to drop to zero. If so, + * the object won't be refzero processed inline, but will just be queued to + * refzero_list and processed by an earlier caller working on refzero_list, + * eliminating C recursion from even long refzero cascades. If refzero + * finalization is triggered by mark-and-sweep, refzero conditions are ignored + * (objects are not even queued to refzero_list) because mark-and-sweep deals + * with them; refcounts are still updated so that they remain in sync with + * actual references. + */ + +DUK_LOCAL void duk__decref_tvals_norz(duk_hthread *thr, duk_tval *tv, duk_idx_t count) { + DUK_ASSERT(count == 0 || tv != NULL); + + while (count-- > 0) { + DUK_TVAL_DECREF_NORZ(thr, tv); + tv++; + } +} + +DUK_INTERNAL void duk_hobject_refcount_finalize_norz(duk_heap *heap, duk_hobject *h) { + duk_hthread *thr; + duk_uint_fast32_t i; + duk_uint_fast32_t n; + duk_propvalue *p_val; + duk_tval *p_tv; + duk_hstring **p_key; + duk_uint8_t *p_flag; + duk_hobject *h_proto; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(h); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) h) == DUK_HTYPE_OBJECT); + + thr = heap->heap_thread; + DUK_ASSERT(thr != NULL); + + p_key = DUK_HOBJECT_E_GET_KEY_BASE(heap, h); + p_val = DUK_HOBJECT_E_GET_VALUE_BASE(heap, h); + p_flag = DUK_HOBJECT_E_GET_FLAGS_BASE(heap, h); + n = DUK_HOBJECT_GET_ENEXT(h); + while (n-- > 0) { + duk_hstring *key; + + key = p_key[n]; + if (DUK_UNLIKELY(key == NULL)) { + continue; + } + DUK_HSTRING_DECREF_NORZ(thr, key); + if (DUK_UNLIKELY(p_flag[n] & DUK_PROPDESC_FLAG_ACCESSOR)) { + duk_hobject *h_getset; + h_getset = p_val[n].a.get; + DUK_ASSERT(h_getset == NULL || DUK_HEAPHDR_IS_OBJECT((duk_heaphdr *) h_getset)); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, h_getset); + h_getset = p_val[n].a.set; + DUK_ASSERT(h_getset == NULL || DUK_HEAPHDR_IS_OBJECT((duk_heaphdr *) h_getset)); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, h_getset); + } else { + duk_tval *tv_val; + tv_val = &p_val[n].v; + DUK_TVAL_DECREF_NORZ(thr, tv_val); + } + } + + p_tv = DUK_HOBJECT_A_GET_BASE(heap, h); + n = DUK_HOBJECT_GET_ASIZE(h); + while (n-- > 0) { + duk_tval *tv_val; + tv_val = p_tv + n; + DUK_TVAL_DECREF_NORZ(thr, tv_val); + } + + /* Hash part is a 'weak reference' and doesn't contribute to refcounts. */ + + h_proto = (duk_hobject *) DUK_HOBJECT_GET_PROTOTYPE(heap, h); + DUK_ASSERT(h_proto == NULL || DUK_HEAPHDR_IS_OBJECT((duk_heaphdr *) h_proto)); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, h_proto); + + /* XXX: Object subclass tests are quite awkward at present, ideally + * we should be able to switch-case here with a dense index (subtype + * number or something). For now, fast path plain objects and arrays + * and bit test the rest individually. + */ + + if (DUK_HOBJECT_HAS_FASTREFS(h)) { + /* Plain object or array, nothing more to do. While a + * duk_harray has additional fields, none of them need + * DECREF updates. + */ + DUK_ASSERT(DUK_HOBJECT_ALLOWS_FASTREFS(h)); + return; + } + DUK_ASSERT(DUK_HOBJECT_PROHIBITS_FASTREFS(h)); + + /* Slow path: special object, start bit checks from most likely. */ + + /* XXX: reorg, more common first */ + if (DUK_HOBJECT_IS_COMPFUNC(h)) { + duk_hcompfunc *f = (duk_hcompfunc *) h; + duk_tval *tv, *tv_end; + duk_hobject **funcs, **funcs_end; + + DUK_ASSERT_HCOMPFUNC_VALID(f); + + if (DUK_LIKELY(DUK_HCOMPFUNC_GET_DATA(heap, f) != NULL)) { + tv = DUK_HCOMPFUNC_GET_CONSTS_BASE(heap, f); + tv_end = DUK_HCOMPFUNC_GET_CONSTS_END(heap, f); + while (tv < tv_end) { + DUK_TVAL_DECREF_NORZ(thr, tv); + tv++; + } + + funcs = DUK_HCOMPFUNC_GET_FUNCS_BASE(heap, f); + funcs_end = DUK_HCOMPFUNC_GET_FUNCS_END(heap, f); + while (funcs < funcs_end) { + duk_hobject *h_func; + h_func = *funcs; + DUK_ASSERT(h_func != NULL); + DUK_ASSERT(DUK_HEAPHDR_IS_OBJECT((duk_heaphdr *) h_func)); + DUK_HCOMPFUNC_DECREF_NORZ(thr, (duk_hcompfunc *) h_func); + funcs++; + } + } else { + /* May happen in some out-of-memory corner cases. */ + DUK_D(DUK_DPRINT("duk_hcompfunc 'data' is NULL, skipping decref")); + } + + DUK_HEAPHDR_DECREF_ALLOWNULL(thr, (duk_heaphdr *) DUK_HCOMPFUNC_GET_LEXENV(heap, f)); + DUK_HEAPHDR_DECREF_ALLOWNULL(thr, (duk_heaphdr *) DUK_HCOMPFUNC_GET_VARENV(heap, f)); + DUK_HEAPHDR_DECREF_ALLOWNULL(thr, (duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA(heap, f)); + } else if (DUK_HOBJECT_IS_DECENV(h)) { + duk_hdecenv *e = (duk_hdecenv *) h; + DUK_ASSERT_HDECENV_VALID(e); + DUK_HTHREAD_DECREF_NORZ_ALLOWNULL(thr, e->thread); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, e->varmap); + } else if (DUK_HOBJECT_IS_OBJENV(h)) { + duk_hobjenv *e = (duk_hobjenv *) h; + DUK_ASSERT_HOBJENV_VALID(e); + DUK_ASSERT(e->target != NULL); /* Required for object environments. */ + DUK_HOBJECT_DECREF_NORZ(thr, e->target); +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + } else if (DUK_HOBJECT_IS_BUFOBJ(h)) { + duk_hbufobj *b = (duk_hbufobj *) h; + DUK_ASSERT_HBUFOBJ_VALID(b); + DUK_HBUFFER_DECREF_NORZ_ALLOWNULL(thr, (duk_hbuffer *) b->buf); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, (duk_hobject *) b->buf_prop); +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + } else if (DUK_HOBJECT_IS_BOUNDFUNC(h)) { + duk_hboundfunc *f = (duk_hboundfunc *) (void *) h; + DUK_ASSERT_HBOUNDFUNC_VALID(f); + DUK_TVAL_DECREF_NORZ(thr, &f->target); + DUK_TVAL_DECREF_NORZ(thr, &f->this_binding); + duk__decref_tvals_norz(thr, f->args, f->nargs); +#if defined(DUK_USE_ES6_PROXY) + } else if (DUK_HOBJECT_IS_PROXY(h)) { + duk_hproxy *p = (duk_hproxy *) h; + DUK_ASSERT_HPROXY_VALID(p); + DUK_HOBJECT_DECREF_NORZ(thr, p->target); + DUK_HOBJECT_DECREF_NORZ(thr, p->handler); +#endif /* DUK_USE_ES6_PROXY */ + } else if (DUK_HOBJECT_IS_THREAD(h)) { + duk_hthread *t = (duk_hthread *) h; + duk_activation *act; + duk_tval *tv; + + DUK_ASSERT_HTHREAD_VALID(t); + + tv = t->valstack; + while (tv < t->valstack_top) { + DUK_TVAL_DECREF_NORZ(thr, tv); + tv++; + } + + for (act = t->callstack_curr; act != NULL; act = act->parent) { + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, (duk_hobject *) DUK_ACT_GET_FUNC(act)); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, (duk_hobject *) act->var_env); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, (duk_hobject *) act->lex_env); +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, (duk_hobject *) act->prev_caller); +#endif +#if 0 /* nothing now */ + for (cat = act->cat; cat != NULL; cat = cat->parent) { + } +#endif + } + + + for (i = 0; i < DUK_NUM_BUILTINS; i++) { + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, (duk_hobject *) t->builtins[i]); + } + + DUK_HTHREAD_DECREF_NORZ_ALLOWNULL(thr, (duk_hthread *) t->resumer); + } else { + /* We may come here if the object should have a FASTREFS flag + * but it's missing for some reason. Assert for never getting + * here; however, other than performance, this is harmless. + */ + DUK_D(DUK_DPRINT("missing FASTREFS flag for: %!iO", h)); + DUK_ASSERT(0); + } +} + +DUK_INTERNAL void duk_heaphdr_refcount_finalize_norz(duk_heap *heap, duk_heaphdr *hdr) { + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(hdr != NULL); + + if (DUK_HEAPHDR_IS_OBJECT(hdr)) { + duk_hobject_refcount_finalize_norz(heap, (duk_hobject *) hdr); + } + /* DUK_HTYPE_BUFFER: nothing to finalize */ + /* DUK_HTYPE_STRING: nothing to finalize */ +} + +/* + * Refzero processing for duk_hobject: queue a refzero'ed object to either + * finalize_list or refzero_list and process the relevent list(s) if + * necessary. + * + * Refzero_list is single linked, with only 'prev' pointers set and valid. + * All 'next' pointers are intentionally left as garbage. This doesn't + * matter because refzero_list is processed to completion before any other + * code (like mark-and-sweep) might walk the list. + * + * In more detail: + * + * - On first insert refzero_list is NULL and the new object becomes the + * first and only element on the list; duk__refcount_free_pending() is + * called and it starts processing the list from the initial element, + * i.e. the list tail. + * + * - As each object is refcount finalized, new objects may be queued to + * refzero_list head. Their 'next' pointers are left as garbage, but + * 'prev' points are set correctly, with the element at refzero_list + * having a NULL 'prev' pointer. The fact that refzero_list is non-NULL + * is used to reject (1) recursive duk__refcount_free_pending() and + * (2) finalize_list processing calls. + * + * - When we're done with the current object, read its 'prev' pointer and + * free the object. If 'prev' is NULL, we've reached head of list and are + * done: set refzero_list to NULL and process pending finalizers. Otherwise + * continue processing the list. + * + * A refzero cascade is free of side effects because it only involves + * queueing more objects and freeing memory; finalizer execution is blocked + * in the code path queueing objects to finalize_list. As a result the + * initial refzero call (which triggers duk__refcount_free_pending()) must + * check finalize_list so that finalizers are executed snappily. + * + * If finalize_list processing starts first, refzero may occur while we're + * processing finalizers. That's fine: that particular refzero cascade is + * handled to completion without side effects. Once the cascade is complete, + * we'll run pending finalizers but notice that we're already doing that and + * return. + * + * This could be expanded to allow incremental freeing: just bail out + * early and resume at a future alloc/decref/refzero. However, if that + * were done, the list structure would need to be kept consistent at all + * times, mark-and-sweep would need to handle refzero_list, etc. + */ + +DUK_LOCAL void duk__refcount_free_pending(duk_heap *heap) { + duk_heaphdr *curr; +#if defined(DUK_USE_DEBUG) + duk_int_t count = 0; +#endif + + DUK_ASSERT(heap != NULL); + + curr = heap->refzero_list; + DUK_ASSERT(curr != NULL); + DUK_ASSERT(DUK_HEAPHDR_GET_PREV(heap, curr) == NULL); /* We're called on initial insert only. */ + /* curr->next is GARBAGE. */ + + do { + duk_heaphdr *prev; + + DUK_DDD(DUK_DDDPRINT("refzero processing %p: %!O", (void *) curr, (duk_heaphdr *) curr)); + +#if defined(DUK_USE_DEBUG) + count++; +#endif + + DUK_ASSERT(curr != NULL); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(curr) == DUK_HTYPE_OBJECT); /* currently, always the case */ + /* FINALIZED may be set; don't care about flags here. */ + + /* Refcount finalize 'curr'. Refzero_list must be non-NULL + * here to prevent recursive entry to duk__refcount_free_pending(). + */ + DUK_ASSERT(heap->refzero_list != NULL); + duk_hobject_refcount_finalize_norz(heap, (duk_hobject *) curr); + + prev = DUK_HEAPHDR_GET_PREV(heap, curr); + DUK_ASSERT((prev == NULL && heap->refzero_list == curr) || \ + (prev != NULL && heap->refzero_list != curr)); + /* prev->next is intentionally not updated and is garbage. */ + + duk_free_hobject(heap, (duk_hobject *) curr); /* Invalidates 'curr'. */ + + curr = prev; + } while (curr != NULL); + + heap->refzero_list = NULL; + + DUK_DD(DUK_DDPRINT("refzero processed %ld objects", (long) count)); +} + +DUK_LOCAL DUK_INLINE void duk__refcount_refzero_hobject(duk_heap *heap, duk_hobject *obj, duk_bool_t skip_free_pending) { + duk_heaphdr *hdr; + duk_heaphdr *root; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) obj) == DUK_HTYPE_OBJECT); + + hdr = (duk_heaphdr *) obj; + + /* Refzero'd objects must be in heap_allocated. They can't be in + * finalize_list because all objects on finalize_list have an + * artificial +1 refcount bump. + */ +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(duk_heap_in_heap_allocated(heap, (duk_heaphdr *) obj)); +#endif + + DUK_HEAP_REMOVE_FROM_HEAP_ALLOCATED(heap, hdr); + +#if defined(DUK_USE_FINALIZER_SUPPORT) + /* This finalizer check MUST BE side effect free. It should also be + * as fast as possible because it's applied to every object freed. + */ + if (DUK_UNLIKELY(DUK_HOBJECT_HAS_FINALIZER_FAST(heap, (duk_hobject *) hdr) != 0U)) { + /* Special case: FINALIZED may be set if mark-and-sweep queued + * object for finalization, the finalizer was executed (and + * FINALIZED set), mark-and-sweep hasn't yet processed the + * object again, but its refcount drops to zero. Free without + * running the finalizer again. + */ + if (DUK_HEAPHDR_HAS_FINALIZED(hdr)) { + DUK_D(DUK_DPRINT("refzero'd object has finalizer and FINALIZED is set -> free")); + } else { + /* Set FINALIZABLE flag so that all objects on finalize_list + * will have it set and are thus detectable based on the + * flag alone. + */ + DUK_HEAPHDR_SET_FINALIZABLE(hdr); + DUK_ASSERT(!DUK_HEAPHDR_HAS_FINALIZED(hdr)); + +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Bump refcount on finalize_list insert so that a + * refzero can never occur when an object is waiting + * for its finalizer call. Refzero might otherwise + * now happen because we allow duk_push_heapptr() for + * objects pending finalization. + */ + DUK_HEAPHDR_PREINC_REFCOUNT(hdr); +#endif + DUK_HEAP_INSERT_INTO_FINALIZE_LIST(heap, hdr); + + /* Process finalizers unless skipping is explicitly + * requested (NORZ) or refzero_list is being processed + * (avoids side effects during a refzero cascade). + * If refzero_list is processed, the initial refzero + * call will run pending finalizers when refzero_list + * is done. + */ + if (!skip_free_pending && heap->refzero_list == NULL) { + duk_heap_process_finalize_list(heap); + } + return; + } + } +#endif /* DUK_USE_FINALIZER_SUPPORT */ + + /* No need to finalize, free object via refzero_list. */ + + root = heap->refzero_list; + + DUK_HEAPHDR_SET_PREV(heap, hdr, NULL); + /* 'next' is left as GARBAGE. */ + heap->refzero_list = hdr; + + if (root == NULL) { + /* Object is now queued. Refzero_list was NULL so + * no-one is currently processing it; do it here. + * With refzero processing just doing a cascade of + * free calls, we can process it directly even when + * NORZ macros are used: there are no side effects. + */ + duk__refcount_free_pending(heap); + DUK_ASSERT(heap->refzero_list == NULL); + + /* Process finalizers only after the entire cascade + * is finished. In most cases there's nothing to + * finalize, so fast path check to avoid a call. + */ +#if defined(DUK_USE_FINALIZER_SUPPORT) + if (!skip_free_pending && DUK_UNLIKELY(heap->finalize_list != NULL)) { + duk_heap_process_finalize_list(heap); + } +#endif + } else { + DUK_ASSERT(DUK_HEAPHDR_GET_PREV(heap, root) == NULL); + DUK_HEAPHDR_SET_PREV(heap, root, hdr); + + /* Object is now queued. Because refzero_list was + * non-NULL, it's already being processed by someone + * in the C call stack, so we're done. + */ + } +} + +#if defined(DUK_USE_FINALIZER_SUPPORT) +DUK_INTERNAL DUK_ALWAYS_INLINE void duk_refzero_check_fast(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(thr->heap->refzero_list == NULL); /* Processed to completion inline. */ + + if (DUK_UNLIKELY(thr->heap->finalize_list != NULL)) { + duk_heap_process_finalize_list(thr->heap); + } +} + +DUK_INTERNAL void duk_refzero_check_slow(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(thr->heap->refzero_list == NULL); /* Processed to completion inline. */ + + if (DUK_UNLIKELY(thr->heap->finalize_list != NULL)) { + duk_heap_process_finalize_list(thr->heap); + } +} +#endif /* DUK_USE_FINALIZER_SUPPORT */ + +/* + * Refzero processing for duk_hstring. + */ + +DUK_LOCAL DUK_INLINE void duk__refcount_refzero_hstring(duk_heap *heap, duk_hstring *str) { + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(str != NULL); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) str) == DUK_HTYPE_STRING); + + duk_heap_strcache_string_remove(heap, str); + duk_heap_strtable_unlink(heap, str); + duk_free_hstring(heap, str); +} + +/* + * Refzero processing for duk_hbuffer. + */ + +DUK_LOCAL DUK_INLINE void duk__refcount_refzero_hbuffer(duk_heap *heap, duk_hbuffer *buf) { + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->heap_thread != NULL); + DUK_ASSERT(buf != NULL); + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE((duk_heaphdr *) buf) == DUK_HTYPE_BUFFER); + + DUK_HEAP_REMOVE_FROM_HEAP_ALLOCATED(heap, (duk_heaphdr *) buf); + duk_free_hbuffer(heap, buf); +} + +/* + * Incref and decref functions. + * + * Decref may trigger immediate refzero handling, which may free and finalize + * an arbitrary number of objects (a "DECREF cascade"). + * + * Refzero handling is skipped entirely if (1) mark-and-sweep is running or + * (2) execution is paused in the debugger. The objects are left in the heap, + * and will be freed by mark-and-sweep or eventual heap destruction. + * + * This is necessary during mark-and-sweep because refcounts are also updated + * during the sweep phase (otherwise objects referenced by a swept object + * would have incorrect refcounts) which then calls here. This could be + * avoided by using separate decref macros in mark-and-sweep; however, + * mark-and-sweep also calls finalizers which would use the ordinary decref + * macros anyway. + * + * We can't process refzeros (= free objects) when the debugger is running + * as the debugger might make an object unreachable but still continue + * inspecting it (or even cause it to be pushed back). So we must rely on + * mark-and-sweep to collect them. + * + * The DUK__RZ_SUPPRESS_CHECK() condition is also used in heap destruction + * when running finalizers for remaining objects: the flag prevents objects + * from being moved around in heap linked lists while that's being done. + * + * The suppress condition is important to performance. + */ + +#define DUK__RZ_SUPPRESS_ASSERT1() do { \ + DUK_ASSERT(thr != NULL); \ + DUK_ASSERT(thr->heap != NULL); \ + /* When mark-and-sweep runs, heap_thread must exist. */ \ + DUK_ASSERT(thr->heap->ms_running == 0 || thr->heap->heap_thread != NULL); \ + /* When mark-and-sweep runs, the 'thr' argument always matches heap_thread. \ + * This could be used to e.g. suppress check against 'thr' directly (and \ + * knowing it would be heap_thread); not really used now. \ + */ \ + DUK_ASSERT(thr->heap->ms_running == 0 || thr == thr->heap->heap_thread); \ + /* We may be called when the heap is initializing and we process \ + * refzeros normally, but mark-and-sweep and finalizers are prevented \ + * if that's the case. \ + */ \ + DUK_ASSERT(thr->heap->heap_initializing == 0 || thr->heap->ms_prevent_count > 0); \ + DUK_ASSERT(thr->heap->heap_initializing == 0 || thr->heap->pf_prevent_count > 0); \ + } while (0) + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +#define DUK__RZ_SUPPRESS_ASSERT2() do { \ + /* When debugger is paused, ms_running is set. */ \ + DUK_ASSERT(!DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) || thr->heap->ms_running != 0); \ + } while (0) +#define DUK__RZ_SUPPRESS_COND() (heap->ms_running != 0) +#else +#define DUK__RZ_SUPPRESS_ASSERT2() do { } while (0) +#define DUK__RZ_SUPPRESS_COND() (heap->ms_running != 0) +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +#define DUK__RZ_SUPPRESS_CHECK() do { \ + DUK__RZ_SUPPRESS_ASSERT1(); \ + DUK__RZ_SUPPRESS_ASSERT2(); \ + if (DUK_UNLIKELY(DUK__RZ_SUPPRESS_COND())) { \ + DUK_DDD(DUK_DDDPRINT("refzero handling suppressed (not even queued) when mark-and-sweep running, object: %p", (void *) h)); \ + return; \ + } \ + } while (0) + +#define DUK__RZ_STRING() do { \ + duk__refcount_refzero_hstring(heap, (duk_hstring *) h); \ + } while (0) +#define DUK__RZ_BUFFER() do { \ + duk__refcount_refzero_hbuffer(heap, (duk_hbuffer *) h); \ + } while (0) +#define DUK__RZ_OBJECT() do { \ + duk__refcount_refzero_hobject(heap, (duk_hobject *) h, skip_free_pending); \ + } while (0) + +/* XXX: test the effect of inlining here vs. NOINLINE in refzero helpers */ +#if defined(DUK_USE_FAST_REFCOUNT_DEFAULT) +#define DUK__RZ_INLINE DUK_ALWAYS_INLINE +#else +#define DUK__RZ_INLINE /*nop*/ +#endif + +DUK_LOCAL DUK__RZ_INLINE void duk__hstring_refzero_helper(duk_hthread *thr, duk_hstring *h) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h != NULL); + heap = thr->heap; + + DUK__RZ_SUPPRESS_CHECK(); + DUK__RZ_STRING(); +} + +DUK_LOCAL DUK__RZ_INLINE void duk__hbuffer_refzero_helper(duk_hthread *thr, duk_hbuffer *h) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h != NULL); + heap = thr->heap; + + DUK__RZ_SUPPRESS_CHECK(); + DUK__RZ_BUFFER(); +} + +DUK_LOCAL DUK__RZ_INLINE void duk__hobject_refzero_helper(duk_hthread *thr, duk_hobject *h, duk_bool_t skip_free_pending) { + duk_heap *heap; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h != NULL); + heap = thr->heap; + + DUK__RZ_SUPPRESS_CHECK(); + DUK__RZ_OBJECT(); +} + +DUK_LOCAL DUK__RZ_INLINE void duk__heaphdr_refzero_helper(duk_hthread *thr, duk_heaphdr *h, duk_bool_t skip_free_pending) { + duk_heap *heap; + duk_small_uint_t htype; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h != NULL); + heap = thr->heap; + + htype = (duk_small_uint_t) DUK_HEAPHDR_GET_TYPE(h); + DUK__RZ_SUPPRESS_CHECK(); + + switch (htype) { + case DUK_HTYPE_STRING: + /* Strings have no internal references but do have "weak" + * references in the string cache. Also note that strings + * are not on the heap_allocated list like other heap + * elements. + */ + + DUK__RZ_STRING(); + break; + + case DUK_HTYPE_OBJECT: + /* Objects have internal references. Must finalize through + * the "refzero" work list. + */ + + DUK__RZ_OBJECT(); + break; + + default: + /* Buffers have no internal references. However, a dynamic + * buffer has a separate allocation for the buffer. This is + * freed by duk_heap_free_heaphdr_raw(). + */ + + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(h) == DUK_HTYPE_BUFFER); + DUK__RZ_BUFFER(); + break; + } +} + +DUK_INTERNAL DUK_NOINLINE void duk_heaphdr_refzero(duk_hthread *thr, duk_heaphdr *h) { + duk__heaphdr_refzero_helper(thr, h, 0 /*skip_free_pending*/); +} + +DUK_INTERNAL DUK_NOINLINE void duk_heaphdr_refzero_norz(duk_hthread *thr, duk_heaphdr *h) { + duk__heaphdr_refzero_helper(thr, h, 1 /*skip_free_pending*/); +} + +DUK_INTERNAL DUK_NOINLINE void duk_hstring_refzero(duk_hthread *thr, duk_hstring *h) { + duk__hstring_refzero_helper(thr, h); +} + +DUK_INTERNAL DUK_NOINLINE void duk_hbuffer_refzero(duk_hthread *thr, duk_hbuffer *h) { + duk__hbuffer_refzero_helper(thr, h); +} + +DUK_INTERNAL DUK_NOINLINE void duk_hobject_refzero(duk_hthread *thr, duk_hobject *h) { + duk__hobject_refzero_helper(thr, h, 0 /*skip_free_pending*/); +} + +DUK_INTERNAL DUK_NOINLINE void duk_hobject_refzero_norz(duk_hthread *thr, duk_hobject *h) { + duk__hobject_refzero_helper(thr, h, 1 /*skip_free_pending*/); +} + +#if !defined(DUK_USE_FAST_REFCOUNT_DEFAULT) +DUK_INTERNAL void duk_tval_incref(duk_tval *tv) { + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv)) { + duk_heaphdr *h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(h)); + DUK_ASSERT_DISABLE(h->h_refcount >= 0); + DUK_HEAPHDR_PREINC_REFCOUNT(h); + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(h) != 0); /* No wrapping. */ + } +} + +DUK_INTERNAL void duk_tval_decref(duk_hthread *thr, duk_tval *tv) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv)) { + duk_heaphdr *h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(h)); + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(h) >= 1); +#if 0 + if (DUK_HEAPHDR_PREDEC_REFCOUNT(h) != 0) { + return; + } + duk_heaphdr_refzero(thr, h); +#else + duk_heaphdr_decref(thr, h); +#endif + } +} + +DUK_INTERNAL void duk_tval_decref_norz(duk_hthread *thr, duk_tval *tv) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv != NULL); + + if (DUK_TVAL_NEEDS_REFCOUNT_UPDATE(tv)) { + duk_heaphdr *h = DUK_TVAL_GET_HEAPHDR(tv); + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(h)); + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT(h) >= 1); +#if 0 + if (DUK_HEAPHDR_PREDEC_REFCOUNT(h) != 0) { + return; + } + duk_heaphdr_refzero_norz(thr, h); +#else + duk_heaphdr_decref_norz(thr, h); +#endif + } +} +#endif /* !DUK_USE_FAST_REFCOUNT_DEFAULT */ + +#define DUK__DECREF_ASSERTS() do { \ + DUK_ASSERT(thr != NULL); \ + DUK_ASSERT(thr->heap != NULL); \ + DUK_ASSERT(h != NULL); \ + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID((duk_heaphdr *) h)); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h) >= 1); \ + } while (0) +#if defined(DUK_USE_ROM_OBJECTS) +#define DUK__INCREF_SHARED() do { \ + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)) { \ + return; \ + } \ + DUK_HEAPHDR_PREINC_REFCOUNT((duk_heaphdr *) h); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h) != 0); /* No wrapping. */ \ + } while (0) +#define DUK__DECREF_SHARED() do { \ + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)) { \ + return; \ + } \ + if (DUK_HEAPHDR_PREDEC_REFCOUNT((duk_heaphdr *) h) != 0) { \ + return; \ + } \ + } while (0) +#else +#define DUK__INCREF_SHARED() do { \ + DUK_HEAPHDR_PREINC_REFCOUNT((duk_heaphdr *) h); \ + DUK_ASSERT(DUK_HEAPHDR_GET_REFCOUNT((duk_heaphdr *) h) != 0); /* No wrapping. */ \ + } while (0) +#define DUK__DECREF_SHARED() do { \ + if (DUK_HEAPHDR_PREDEC_REFCOUNT((duk_heaphdr *) h) != 0) { \ + return; \ + } \ + } while (0) +#endif + +#if !defined(DUK_USE_FAST_REFCOUNT_DEFAULT) +/* This will in practice be inlined because it's just an INC instructions + * and a bit test + INC when ROM objects are enabled. + */ +DUK_INTERNAL void duk_heaphdr_incref(duk_heaphdr *h) { + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HEAPHDR_HTYPE_VALID(h)); + DUK_ASSERT_DISABLE(DUK_HEAPHDR_GET_REFCOUNT(h) >= 0); + + DUK__INCREF_SHARED(); +} + +DUK_INTERNAL void duk_heaphdr_decref(duk_hthread *thr, duk_heaphdr *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_heaphdr_refzero(thr, h); + + /* Forced mark-and-sweep when GC torture enabled; this could happen + * on any DECREF (but not DECREF_NORZ). + */ + DUK_GC_TORTURE(thr->heap); +} +DUK_INTERNAL void duk_heaphdr_decref_norz(duk_hthread *thr, duk_heaphdr *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_heaphdr_refzero_norz(thr, h); +} +#endif /* !DUK_USE_FAST_REFCOUNT_DEFAULT */ + +#if 0 /* Not needed. */ +DUK_INTERNAL void duk_hstring_decref(duk_hthread *thr, duk_hstring *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_hstring_refzero(thr, h); +} +DUK_INTERNAL void duk_hstring_decref_norz(duk_hthread *thr, duk_hstring *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_hstring_refzero_norz(thr, h); +} +DUK_INTERNAL void duk_hbuffer_decref(duk_hthread *thr, duk_hbuffer *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_hbuffer_refzero(thr, h); +} +DUK_INTERNAL void duk_hbuffer_decref_norz(duk_hthread *thr, duk_hbuffer *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_hbuffer_refzero_norz(thr, h); +} +DUK_INTERNAL void duk_hobject_decref(duk_hthread *thr, duk_hobject *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_hobject_refzero(thr, h); +} +DUK_INTERNAL void duk_hobject_decref_norz(duk_hthread *thr, duk_hobject *h) { + DUK__DECREF_ASSERTS(); + DUK__DECREF_SHARED(); + duk_hobject_refzero_norz(thr, h); +} +#endif + +#else /* DUK_USE_REFERENCE_COUNTING */ + +/* no refcounting */ + +#endif /* DUK_USE_REFERENCE_COUNTING */ + +/* automatic undefs */ +#undef DUK__DECREF_ASSERTS +#undef DUK__DECREF_SHARED +#undef DUK__INCREF_SHARED +#undef DUK__RZ_BUFFER +#undef DUK__RZ_INLINE +#undef DUK__RZ_OBJECT +#undef DUK__RZ_STRING +#undef DUK__RZ_SUPPRESS_ASSERT1 +#undef DUK__RZ_SUPPRESS_ASSERT2 +#undef DUK__RZ_SUPPRESS_CHECK +#undef DUK__RZ_SUPPRESS_COND +#line 1 "duk_heap_stringcache.c" +/* + * String cache. + * + * Provides a cache to optimize indexed string lookups. The cache keeps + * track of (byte offset, char offset) states for a fixed number of strings. + * Otherwise we'd need to scan from either end of the string, as we store + * strings in (extended) UTF-8. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Delete references to given hstring from the heap string cache. + * + * String cache references are 'weak': they are not counted towards + * reference counts, nor serve as roots for mark-and-sweep. When an + * object is about to be freed, such references need to be removed. + */ + +DUK_INTERNAL void duk_heap_strcache_string_remove(duk_heap *heap, duk_hstring *h) { + duk_uint_t i; + for (i = 0; i < DUK_HEAP_STRCACHE_SIZE; i++) { + duk_strcache_entry *c = heap->strcache + i; + if (c->h == h) { + DUK_DD(DUK_DDPRINT("deleting weak strcache reference to hstring %p from heap %p", + (void *) h, (void *) heap)); + c->h = NULL; + + /* XXX: the string shouldn't appear twice, but we now loop to the + * end anyway; if fixed, add a looping assertion to ensure there + * is no duplicate. + */ + } + } +} + +/* + * String scanning helpers + * + * All bytes other than UTF-8 continuation bytes ([0x80,0xbf]) are + * considered to contribute a character. This must match how string + * character length is computed. + */ + +DUK_LOCAL const duk_uint8_t *duk__scan_forwards(const duk_uint8_t *p, const duk_uint8_t *q, duk_uint_fast32_t n) { + while (n > 0) { + for (;;) { + p++; + if (p >= q) { + return NULL; + } + if ((*p & 0xc0) != 0x80) { + break; + } + } + n--; + } + return p; +} + +DUK_LOCAL const duk_uint8_t *duk__scan_backwards(const duk_uint8_t *p, const duk_uint8_t *q, duk_uint_fast32_t n) { + while (n > 0) { + for (;;) { + p--; + if (p < q) { + return NULL; + } + if ((*p & 0xc0) != 0x80) { + break; + } + } + n--; + } + return p; +} + +/* + * Convert char offset to byte offset + * + * Avoid using the string cache if possible: for ASCII strings byte and + * char offsets are equal and for short strings direct scanning may be + * better than using the string cache (which may evict a more important + * entry). + * + * Typing now assumes 32-bit string byte/char offsets (duk_uint_fast32_t). + * Better typing might be to use duk_size_t. + * + * Caller should ensure 'char_offset' is within the string bounds [0,charlen] + * (endpoint is inclusive). If this is not the case, no memory unsafe + * behavior will happen but an error will be thrown. + */ + +DUK_INTERNAL duk_uint_fast32_t duk_heap_strcache_offset_char2byte(duk_hthread *thr, duk_hstring *h, duk_uint_fast32_t char_offset) { + duk_heap *heap; + duk_strcache_entry *sce; + duk_uint_fast32_t byte_offset; + duk_uint_t i; + duk_bool_t use_cache; + duk_uint_fast32_t dist_start, dist_end, dist_sce; + duk_uint_fast32_t char_length; + const duk_uint8_t *p_start; + const duk_uint8_t *p_end; + const duk_uint8_t *p_found; + + /* + * For ASCII strings, the answer is simple. + */ + + if (DUK_LIKELY(DUK_HSTRING_IS_ASCII(h))) { + return char_offset; + } + + char_length = (duk_uint_fast32_t) DUK_HSTRING_GET_CHARLEN(h); + DUK_ASSERT(char_offset <= char_length); + + if (DUK_LIKELY(DUK_HSTRING_IS_ASCII(h))) { + /* Must recheck because the 'is ascii' flag may be set + * lazily. Alternatively, we could just compare charlen + * to bytelen. + */ + return char_offset; + } + + /* + * For non-ASCII strings, we need to scan forwards or backwards + * from some starting point. The starting point may be the start + * or end of the string, or some cached midpoint in the string + * cache. + * + * For "short" strings we simply scan without checking or updating + * the cache. For longer strings we check and update the cache as + * necessary, inserting a new cache entry if none exists. + */ + + DUK_DDD(DUK_DDDPRINT("non-ascii string %p, char_offset=%ld, clen=%ld, blen=%ld", + (void *) h, (long) char_offset, + (long) DUK_HSTRING_GET_CHARLEN(h), + (long) DUK_HSTRING_GET_BYTELEN(h))); + + heap = thr->heap; + sce = NULL; + use_cache = (char_length > DUK_HEAP_STRINGCACHE_NOCACHE_LIMIT); + + if (use_cache) { +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + DUK_DDD(DUK_DDDPRINT("stringcache before char2byte (using cache):")); + for (i = 0; i < DUK_HEAP_STRCACHE_SIZE; i++) { + duk_strcache_entry *c = heap->strcache + i; + DUK_DDD(DUK_DDDPRINT(" [%ld] -> h=%p, cidx=%ld, bidx=%ld", + (long) i, (void *) c->h, (long) c->cidx, (long) c->bidx)); + } +#endif + + for (i = 0; i < DUK_HEAP_STRCACHE_SIZE; i++) { + duk_strcache_entry *c = heap->strcache + i; + + if (c->h == h) { + sce = c; + break; + } + } + } + + /* + * Scan from shortest distance: + * - start of string + * - end of string + * - cache entry (if exists) + */ + + DUK_ASSERT(DUK_HSTRING_GET_CHARLEN(h) >= char_offset); + dist_start = char_offset; + dist_end = char_length - char_offset; + dist_sce = 0; DUK_UNREF(dist_sce); /* initialize for debug prints, needed if sce==NULL */ + + p_start = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h); + p_end = (const duk_uint8_t *) (p_start + DUK_HSTRING_GET_BYTELEN(h)); + p_found = NULL; + + if (sce) { + if (char_offset >= sce->cidx) { + dist_sce = char_offset - sce->cidx; + if ((dist_sce <= dist_start) && (dist_sce <= dist_end)) { + DUK_DDD(DUK_DDDPRINT("non-ascii string, use_cache=%ld, sce=%p:%ld:%ld, " + "dist_start=%ld, dist_end=%ld, dist_sce=%ld => " + "scan forwards from sce", + (long) use_cache, (void *) (sce ? sce->h : NULL), + (sce ? (long) sce->cidx : (long) -1), + (sce ? (long) sce->bidx : (long) -1), + (long) dist_start, (long) dist_end, (long) dist_sce)); + + p_found = duk__scan_forwards(p_start + sce->bidx, + p_end, + dist_sce); + goto scan_done; + } + } else { + dist_sce = sce->cidx - char_offset; + if ((dist_sce <= dist_start) && (dist_sce <= dist_end)) { + DUK_DDD(DUK_DDDPRINT("non-ascii string, use_cache=%ld, sce=%p:%ld:%ld, " + "dist_start=%ld, dist_end=%ld, dist_sce=%ld => " + "scan backwards from sce", + (long) use_cache, (void *) (sce ? sce->h : NULL), + (sce ? (long) sce->cidx : (long) -1), + (sce ? (long) sce->bidx : (long) -1), + (long) dist_start, (long) dist_end, (long) dist_sce)); + + p_found = duk__scan_backwards(p_start + sce->bidx, + p_start, + dist_sce); + goto scan_done; + } + } + } + + /* no sce, or sce scan not best */ + + if (dist_start <= dist_end) { + DUK_DDD(DUK_DDDPRINT("non-ascii string, use_cache=%ld, sce=%p:%ld:%ld, " + "dist_start=%ld, dist_end=%ld, dist_sce=%ld => " + "scan forwards from string start", + (long) use_cache, (void *) (sce ? sce->h : NULL), + (sce ? (long) sce->cidx : (long) -1), + (sce ? (long) sce->bidx : (long) -1), + (long) dist_start, (long) dist_end, (long) dist_sce)); + + p_found = duk__scan_forwards(p_start, + p_end, + dist_start); + } else { + DUK_DDD(DUK_DDDPRINT("non-ascii string, use_cache=%ld, sce=%p:%ld:%ld, " + "dist_start=%ld, dist_end=%ld, dist_sce=%ld => " + "scan backwards from string end", + (long) use_cache, (void *) (sce ? sce->h : NULL), + (sce ? (long) sce->cidx : (long) -1), + (sce ? (long) sce->bidx : (long) -1), + (long) dist_start, (long) dist_end, (long) dist_sce)); + + p_found = duk__scan_backwards(p_end, + p_start, + dist_end); + } + + scan_done: + + if (DUK_UNLIKELY(p_found == NULL)) { + /* Scan error: this shouldn't normally happen; it could happen if + * string is not valid UTF-8 data, and clen/blen are not consistent + * with the scanning algorithm. + */ + goto scan_error; + } + + DUK_ASSERT(p_found >= p_start); + DUK_ASSERT(p_found <= p_end); /* may be equal */ + byte_offset = (duk_uint32_t) (p_found - p_start); + + DUK_DDD(DUK_DDDPRINT("-> string %p, cidx %ld -> bidx %ld", + (void *) h, (long) char_offset, (long) byte_offset)); + + /* + * Update cache entry (allocating if necessary), and move the + * cache entry to the first place (in an "LRU" policy). + */ + + if (use_cache) { + /* update entry, allocating if necessary */ + if (!sce) { + sce = heap->strcache + DUK_HEAP_STRCACHE_SIZE - 1; /* take last entry */ + sce->h = h; + } + DUK_ASSERT(sce != NULL); + sce->bidx = (duk_uint32_t) (p_found - p_start); + sce->cidx = (duk_uint32_t) char_offset; + + /* LRU: move our entry to first */ + if (sce > &heap->strcache[0]) { + /* + * A C + * B A + * C <- sce ==> B + * D D + */ + duk_strcache_entry tmp; + + tmp = *sce; + duk_memmove((void *) (&heap->strcache[1]), + (const void *) (&heap->strcache[0]), + (size_t) (((char *) sce) - ((char *) &heap->strcache[0]))); + heap->strcache[0] = tmp; + + /* 'sce' points to the wrong entry here, but is no longer used */ + } +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + DUK_DDD(DUK_DDDPRINT("stringcache after char2byte (using cache):")); + for (i = 0; i < DUK_HEAP_STRCACHE_SIZE; i++) { + duk_strcache_entry *c = heap->strcache + i; + DUK_DDD(DUK_DDDPRINT(" [%ld] -> h=%p, cidx=%ld, bidx=%ld", + (long) i, (void *) c->h, (long) c->cidx, (long) c->bidx)); + } +#endif + } + + return byte_offset; + + scan_error: + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); +} +#line 1 "duk_heap_stringtable.c" +/* + * Heap string table handling, string interning. + */ + +/* #include duk_internal.h -> already included */ + +/* Resize checks not needed if minsize == maxsize, typical for low memory + * targets. + */ +#define DUK__STRTAB_RESIZE_CHECK +#if (DUK_USE_STRTAB_MINSIZE == DUK_USE_STRTAB_MAXSIZE) +#undef DUK__STRTAB_RESIZE_CHECK +#endif + +#if defined(DUK_USE_STRTAB_PTRCOMP) +#define DUK__HEAPPTR_ENC16(heap,ptr) DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (ptr)) +#define DUK__HEAPPTR_DEC16(heap,val) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (val)) +#define DUK__GET_STRTABLE(heap) ((heap)->strtable16) +#else +#define DUK__HEAPPTR_ENC16(heap,ptr) (ptr) +#define DUK__HEAPPTR_DEC16(heap,val) (val) +#define DUK__GET_STRTABLE(heap) ((heap)->strtable) +#endif + +#define DUK__STRTAB_U32_MAX_STRLEN 10 /* 4'294'967'295 */ + +/* + * Debug dump stringtable. + */ + +#if defined(DUK_USE_DEBUG) +DUK_INTERNAL void duk_heap_strtable_dump(duk_heap *heap) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *strtable; +#else + duk_hstring **strtable; +#endif + duk_uint32_t i; + duk_hstring *h; + duk_size_t count_total = 0; + duk_size_t count_chain; + duk_size_t count_chain_min = DUK_SIZE_MAX; + duk_size_t count_chain_max = 0; + duk_size_t count_len[8]; /* chain lengths from 0 to 7 */ + + if (heap == NULL) { + DUK_D(DUK_DPRINT("string table, heap=NULL")); + return; + } + + strtable = DUK__GET_STRTABLE(heap); + if (strtable == NULL) { + DUK_D(DUK_DPRINT("string table, strtab=NULL")); + return; + } + + duk_memzero((void *) count_len, sizeof(count_len)); + for (i = 0; i < heap->st_size; i++) { + h = DUK__HEAPPTR_DEC16(heap, strtable[i]); + count_chain = 0; + while (h != NULL) { + count_chain++; + h = h->hdr.h_next; + } + if (count_chain < sizeof(count_len) / sizeof(duk_size_t)) { + count_len[count_chain]++; + } + count_chain_max = (count_chain > count_chain_max ? count_chain : count_chain_max); + count_chain_min = (count_chain < count_chain_min ? count_chain : count_chain_min); + count_total += count_chain; + } + + DUK_D(DUK_DPRINT("string table, strtab=%p, count=%lu, chain min=%lu max=%lu avg=%lf: " + "counts: %lu %lu %lu %lu %lu %lu %lu %lu ...", + (void *) heap->strtable, (unsigned long) count_total, + (unsigned long) count_chain_min, (unsigned long) count_chain_max, + (double) count_total / (double) heap->st_size, + (unsigned long) count_len[0], (unsigned long) count_len[1], + (unsigned long) count_len[2], (unsigned long) count_len[3], + (unsigned long) count_len[4], (unsigned long) count_len[5], + (unsigned long) count_len[6], (unsigned long) count_len[7])); +} +#endif /* DUK_USE_DEBUG */ + +/* + * Assertion helper to ensure strtable is populated correctly. + */ + +#if defined(DUK_USE_ASSERTIONS) +DUK_LOCAL void duk__strtable_assert_checks(duk_heap *heap) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *strtable; +#else + duk_hstring **strtable; +#endif + duk_uint32_t i; + duk_hstring *h; + duk_size_t count = 0; + + DUK_ASSERT(heap != NULL); + + strtable = DUK__GET_STRTABLE(heap); + if (strtable != NULL) { + DUK_ASSERT(heap->st_size != 0); + DUK_ASSERT(heap->st_mask == heap->st_size - 1); + + for (i = 0; i < heap->st_size; i++) { + h = DUK__HEAPPTR_DEC16(heap, strtable[i]); + while (h != NULL) { + DUK_ASSERT((DUK_HSTRING_GET_HASH(h) & heap->st_mask) == i); + count++; + h = h->hdr.h_next; + } + } + } else { + DUK_ASSERT(heap->st_size == 0); + DUK_ASSERT(heap->st_mask == 0); + } + +#if defined(DUK__STRTAB_RESIZE_CHECK) + DUK_ASSERT(count == (duk_size_t) heap->st_count); +#endif +} +#endif /* DUK_USE_ASSERTIONS */ + +/* + * Allocate and initialize a duk_hstring. + * + * Returns a NULL if allocation or initialization fails for some reason. + * + * The string won't be inserted into the string table and isn't tracked in + * any way (link pointers will be NULL). The caller must place the string + * into the string table without any risk of a longjmp, otherwise the string + * is leaked. + */ + +DUK_LOCAL duk_hstring *duk__strtable_alloc_hstring(duk_heap *heap, + const duk_uint8_t *str, + duk_uint32_t blen, + duk_uint32_t strhash, + const duk_uint8_t *extdata) { + duk_hstring *res; + const duk_uint8_t *data; +#if !defined(DUK_USE_HSTRING_ARRIDX) + duk_uarridx_t dummy; +#endif + + DUK_ASSERT(heap != NULL); + DUK_UNREF(extdata); + +#if defined(DUK_USE_STRLEN16) + /* If blen <= 0xffffUL, clen is also guaranteed to be <= 0xffffUL. */ + if (blen > 0xffffUL) { + DUK_D(DUK_DPRINT("16-bit string blen/clen active and blen over 16 bits, reject intern")); + goto alloc_error; + } +#endif + + /* XXX: Memzeroing the allocated structure is not really necessary + * because we could just initialize all fields explicitly (almost + * all fields are initialized explicitly anyway). + */ +#if defined(DUK_USE_HSTRING_EXTDATA) && defined(DUK_USE_EXTSTR_INTERN_CHECK) + if (extdata) { + res = (duk_hstring *) DUK_ALLOC(heap, sizeof(duk_hstring_external)); + if (DUK_UNLIKELY(res == NULL)) { + goto alloc_error; + } + duk_memzero(res, sizeof(duk_hstring_external)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + DUK_HEAPHDR_STRING_INIT_NULLS(&res->hdr); +#endif + DUK_HEAPHDR_SET_TYPE_AND_FLAGS(&res->hdr, DUK_HTYPE_STRING, DUK_HSTRING_FLAG_EXTDATA); + + DUK_ASSERT(extdata[blen] == 0); /* Application responsibility. */ + data = extdata; + ((duk_hstring_external *) res)->extdata = extdata; + } else +#endif /* DUK_USE_HSTRING_EXTDATA && DUK_USE_EXTSTR_INTERN_CHECK */ + { + duk_uint8_t *data_tmp; + + /* NUL terminate for convenient C access */ + DUK_ASSERT(sizeof(duk_hstring) + blen + 1 > blen); /* No wrap, limits ensure. */ + res = (duk_hstring *) DUK_ALLOC(heap, sizeof(duk_hstring) + blen + 1); + if (DUK_UNLIKELY(res == NULL)) { + goto alloc_error; + } + duk_memzero(res, sizeof(duk_hstring)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + DUK_HEAPHDR_STRING_INIT_NULLS(&res->hdr); +#endif + DUK_HEAPHDR_SET_TYPE_AND_FLAGS(&res->hdr, DUK_HTYPE_STRING, 0); + + data_tmp = (duk_uint8_t *) (res + 1); + duk_memcpy(data_tmp, str, blen); + data_tmp[blen] = (duk_uint8_t) 0; + data = (const duk_uint8_t *) data_tmp; + } + + DUK_HSTRING_SET_BYTELEN(res, blen); + DUK_HSTRING_SET_HASH(res, strhash); + + DUK_ASSERT(!DUK_HSTRING_HAS_ARRIDX(res)); +#if defined(DUK_USE_HSTRING_ARRIDX) + res->arridx = duk_js_to_arrayindex_string(data, blen); + if (res->arridx != DUK_HSTRING_NO_ARRAY_INDEX) { +#else + dummy = duk_js_to_arrayindex_string(data, blen); + if (dummy != DUK_HSTRING_NO_ARRAY_INDEX) { +#endif + /* Array index strings cannot be symbol strings, + * and they're always pure ASCII so blen == clen. + */ + DUK_HSTRING_SET_ARRIDX(res); + DUK_HSTRING_SET_ASCII(res); + DUK_ASSERT(duk_unicode_unvalidated_utf8_length(data, (duk_size_t) blen) == blen); + } else { + /* Because 'data' is NUL-terminated, we don't need a + * blen > 0 check here. For NUL (0x00) the symbol + * checks will be false. + */ + if (DUK_UNLIKELY(data[0] >= 0x80U)) { + if (data[0] <= 0x81) { + DUK_HSTRING_SET_SYMBOL(res); + } else if (data[0] == 0x82U || data[0] == 0xffU) { + DUK_HSTRING_SET_HIDDEN(res); + DUK_HSTRING_SET_SYMBOL(res); + } + } + + /* Using an explicit 'ASCII' flag has larger footprint (one call site + * only) but is quite useful for the case when there's no explicit + * 'clen' in duk_hstring. + * + * The flag is set lazily for RAM strings. + */ + DUK_ASSERT(!DUK_HSTRING_HAS_ASCII(res)); + +#if defined(DUK_USE_HSTRING_LAZY_CLEN) + /* Charlen initialized to 0, updated on-the-fly. */ +#else + duk_hstring_init_charlen(res); /* Also sets ASCII flag. */ +#endif + } + + DUK_DDD(DUK_DDDPRINT("interned string, hash=0x%08lx, blen=%ld, has_arridx=%ld, has_extdata=%ld", + (unsigned long) DUK_HSTRING_GET_HASH(res), + (long) DUK_HSTRING_GET_BYTELEN(res), + (long) (DUK_HSTRING_HAS_ARRIDX(res) ? 1 : 0), + (long) (DUK_HSTRING_HAS_EXTDATA(res) ? 1 : 0))); + + DUK_ASSERT(res != NULL); + return res; + + alloc_error: + return NULL; +} + +/* + * Grow strtable allocation in-place. + */ + +#if defined(DUK__STRTAB_RESIZE_CHECK) +DUK_LOCAL void duk__strtable_grow_inplace(duk_heap *heap) { + duk_uint32_t new_st_size; + duk_uint32_t old_st_size; + duk_uint32_t i; + duk_hstring *h; + duk_hstring *next; + duk_hstring *prev; +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *new_ptr; + duk_uint16_t *new_ptr_high; +#else + duk_hstring **new_ptr; + duk_hstring **new_ptr_high; +#endif + + DUK_DD(DUK_DDPRINT("grow in-place: %lu -> %lu", (unsigned long) heap->st_size, (unsigned long) heap->st_size * 2)); + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->st_resizing == 1); + DUK_ASSERT(heap->st_size >= 2); + DUK_ASSERT((heap->st_size & (heap->st_size - 1)) == 0); /* 2^N */ + DUK_ASSERT(DUK__GET_STRTABLE(heap) != NULL); + + DUK_STATS_INC(heap, stats_strtab_resize_grow); + + new_st_size = heap->st_size << 1U; + DUK_ASSERT(new_st_size > heap->st_size); /* No overflow. */ + + /* Reallocate the strtable first and then work in-place to rehash + * strings. We don't need an indirect allocation here: even if GC + * is triggered to satisfy the allocation, recursive strtable resize + * is prevented by flags. This is also why we don't need to use + * DUK_REALLOC_INDIRECT(). + */ + +#if defined(DUK_USE_STRTAB_PTRCOMP) + new_ptr = (duk_uint16_t *) DUK_REALLOC(heap, heap->strtable16, sizeof(duk_uint16_t) * new_st_size); +#else + new_ptr = (duk_hstring **) DUK_REALLOC(heap, heap->strtable, sizeof(duk_hstring *) * new_st_size); +#endif + if (DUK_UNLIKELY(new_ptr == NULL)) { + /* If realloc fails we can continue normally: the string table + * won't "fill up" although chains will gradually get longer. + * When string insertions continue, we'll quite soon try again + * with no special handling. + */ + DUK_D(DUK_DPRINT("string table grow failed, ignoring")); + return; + } +#if defined(DUK_USE_STRTAB_PTRCOMP) + heap->strtable16 = new_ptr; +#else + heap->strtable = new_ptr; +#endif + + /* Rehash a single bucket into two separate ones. When we grow + * by x2 the highest 'new' bit determines whether a string remains + * in its old position (bit is 0) or goes to a new one (bit is 1). + */ + + old_st_size = heap->st_size; + new_ptr_high = new_ptr + old_st_size; + for (i = 0; i < old_st_size; i++) { + duk_hstring *new_root; + duk_hstring *new_root_high; + + h = DUK__HEAPPTR_DEC16(heap, new_ptr[i]); + new_root = h; + new_root_high = NULL; + + prev = NULL; + while (h != NULL) { + duk_uint32_t mask; + + DUK_ASSERT((DUK_HSTRING_GET_HASH(h) & heap->st_mask) == i); + next = h->hdr.h_next; + + /* Example: if previous size was 256, previous mask is 0xFF + * and size is 0x100 which corresponds to the new bit that + * comes into play. + */ + DUK_ASSERT(heap->st_mask == old_st_size - 1); + mask = old_st_size; + if (DUK_HSTRING_GET_HASH(h) & mask) { + if (prev != NULL) { + prev->hdr.h_next = h->hdr.h_next; + } else { + DUK_ASSERT(h == new_root); + new_root = h->hdr.h_next; + } + + h->hdr.h_next = new_root_high; + new_root_high = h; + } else { + prev = h; + } + h = next; + } + + new_ptr[i] = DUK__HEAPPTR_ENC16(heap, new_root); + new_ptr_high[i] = DUK__HEAPPTR_ENC16(heap, new_root_high); + } + + heap->st_size = new_st_size; + heap->st_mask = new_st_size - 1; + +#if defined(DUK_USE_ASSERTIONS) + duk__strtable_assert_checks(heap); +#endif +} +#endif /* DUK__STRTAB_RESIZE_CHECK */ + +/* + * Shrink strtable allocation in-place. + */ + +#if defined(DUK__STRTAB_RESIZE_CHECK) +DUK_LOCAL void duk__strtable_shrink_inplace(duk_heap *heap) { + duk_uint32_t new_st_size; + duk_uint32_t i; + duk_hstring *h; + duk_hstring *other; + duk_hstring *root; +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *old_ptr; + duk_uint16_t *old_ptr_high; + duk_uint16_t *new_ptr; +#else + duk_hstring **old_ptr; + duk_hstring **old_ptr_high; + duk_hstring **new_ptr; +#endif + + DUK_DD(DUK_DDPRINT("shrink in-place: %lu -> %lu", (unsigned long) heap->st_size, (unsigned long) heap->st_size / 2)); + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(heap->st_resizing == 1); + DUK_ASSERT(heap->st_size >= 2); + DUK_ASSERT((heap->st_size & (heap->st_size - 1)) == 0); /* 2^N */ + DUK_ASSERT(DUK__GET_STRTABLE(heap) != NULL); + + DUK_STATS_INC(heap, stats_strtab_resize_shrink); + + new_st_size = heap->st_size >> 1U; + + /* Combine two buckets into a single one. When we shrink, one hash + * bit (highest) disappears. + */ + old_ptr = DUK__GET_STRTABLE(heap); + old_ptr_high = old_ptr + new_st_size; + for (i = 0; i < new_st_size; i++) { + h = DUK__HEAPPTR_DEC16(heap, old_ptr[i]); + other = DUK__HEAPPTR_DEC16(heap, old_ptr_high[i]); + + if (h == NULL) { + /* First chain is empty, so use second one as is. */ + root = other; + } else { + /* Find end of first chain, and link in the second. */ + root = h; + while (h->hdr.h_next != NULL) { + h = h->hdr.h_next; + } + h->hdr.h_next = other; + } + + old_ptr[i] = DUK__HEAPPTR_ENC16(heap, root); + } + + heap->st_size = new_st_size; + heap->st_mask = new_st_size - 1; + + /* The strtable is now consistent and we can realloc safely. Even + * if side effects cause string interning or removal the strtable + * updates are safe. Recursive resize has been prevented by caller. + * This is also why we don't need to use DUK_REALLOC_INDIRECT(). + * + * We assume a realloc() to a smaller size is guaranteed to succeed. + * It would be relatively straightforward to handle the error by + * essentially performing a "grow" step to recover. + */ + +#if defined(DUK_USE_STRTAB_PTRCOMP) + new_ptr = (duk_uint16_t *) DUK_REALLOC(heap, heap->strtable16, sizeof(duk_uint16_t) * new_st_size); + DUK_ASSERT(new_ptr != NULL); + heap->strtable16 = new_ptr; +#else + new_ptr = (duk_hstring **) DUK_REALLOC(heap, heap->strtable, sizeof(duk_hstring *) * new_st_size); + DUK_ASSERT(new_ptr != NULL); + heap->strtable = new_ptr; +#endif + +#if defined(DUK_USE_ASSERTIONS) + duk__strtable_assert_checks(heap); +#endif +} +#endif /* DUK__STRTAB_RESIZE_CHECK */ + +/* + * Grow/shrink check. + */ + +#if defined(DUK__STRTAB_RESIZE_CHECK) +DUK_LOCAL DUK_COLD DUK_NOINLINE void duk__strtable_resize_check(duk_heap *heap) { + duk_uint32_t load_factor; /* fixed point */ + + DUK_ASSERT(heap != NULL); +#if defined(DUK_USE_STRTAB_PTRCOMP) + DUK_ASSERT(heap->strtable16 != NULL); +#else + DUK_ASSERT(heap->strtable != NULL); +#endif + + DUK_STATS_INC(heap, stats_strtab_resize_check); + + /* Prevent recursive resizing. */ + if (DUK_UNLIKELY(heap->st_resizing != 0U)) { + DUK_D(DUK_DPRINT("prevent recursive strtable resize")); + return; + } + + heap->st_resizing = 1; + + DUK_ASSERT(heap->st_size >= 16U); + DUK_ASSERT((heap->st_size >> 4U) >= 1); + load_factor = heap->st_count / (heap->st_size >> 4U); + + DUK_DD(DUK_DDPRINT("resize check string table: size=%lu, count=%lu, load_factor=%lu (fixed point .4; float %lf)", + (unsigned long) heap->st_size, (unsigned long) heap->st_count, + (unsigned long) load_factor, + (double) heap->st_count / (double) heap->st_size)); + + if (load_factor >= DUK_USE_STRTAB_GROW_LIMIT) { + if (heap->st_size >= DUK_USE_STRTAB_MAXSIZE) { + DUK_DD(DUK_DDPRINT("want to grow strtable (based on load factor) but already maximum size")); + } else { + DUK_D(DUK_DPRINT("grow string table: %lu -> %lu", (unsigned long) heap->st_size, (unsigned long) heap->st_size * 2)); +#if defined(DUK_USE_DEBUG) + duk_heap_strtable_dump(heap); +#endif + duk__strtable_grow_inplace(heap); + } + } else if (load_factor <= DUK_USE_STRTAB_SHRINK_LIMIT) { + if (heap->st_size <= DUK_USE_STRTAB_MINSIZE) { + DUK_DD(DUK_DDPRINT("want to shrink strtable (based on load factor) but already minimum size")); + } else { + DUK_D(DUK_DPRINT("shrink string table: %lu -> %lu", (unsigned long) heap->st_size, (unsigned long) heap->st_size / 2)); +#if defined(DUK_USE_DEBUG) + duk_heap_strtable_dump(heap); +#endif + duk__strtable_shrink_inplace(heap); + } + } else { + DUK_DD(DUK_DDPRINT("no need for strtable resize")); + } + + heap->st_resizing = 0; +} +#endif /* DUK__STRTAB_RESIZE_CHECK */ + +/* + * Torture grow/shrink: unconditionally grow and shrink back. + */ + +#if defined(DUK_USE_STRTAB_TORTURE) && defined(DUK__STRTAB_RESIZE_CHECK) +DUK_LOCAL void duk__strtable_resize_torture(duk_heap *heap) { + duk_uint32_t old_st_size; + + DUK_ASSERT(heap != NULL); + + old_st_size = heap->st_size; + if (old_st_size >= DUK_USE_STRTAB_MAXSIZE) { + return; + } + + heap->st_resizing = 1; + duk__strtable_grow_inplace(heap); + if (heap->st_size > old_st_size) { + duk__strtable_shrink_inplace(heap); + } + heap->st_resizing = 0; +} +#endif /* DUK_USE_STRTAB_TORTURE && DUK__STRTAB_RESIZE_CHECK */ + +/* + * Raw intern; string already checked not to be present. + */ + +DUK_LOCAL duk_hstring *duk__strtable_do_intern(duk_heap *heap, const duk_uint8_t *str, duk_uint32_t blen, duk_uint32_t strhash) { + duk_hstring *res; + const duk_uint8_t *extdata; +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *slot; +#else + duk_hstring **slot; +#endif + + DUK_DDD(DUK_DDDPRINT("do_intern: heap=%p, str=%p, blen=%lu, strhash=%lx, st_size=%lu, st_count=%lu, load=%lf", + (void *) heap, (const void *) str, (unsigned long) blen, (unsigned long) strhash, + (unsigned long) heap->st_size, (unsigned long) heap->st_count, + (double) heap->st_count / (double) heap->st_size)); + + DUK_ASSERT(heap != NULL); + + /* Prevent any side effects on the string table and the caller provided + * str/blen arguments while interning is in progress. For example, if + * the caller provided str/blen from a dynamic buffer, a finalizer + * might resize or modify that dynamic buffer, invalidating the call + * arguments. + * + * While finalizers must be prevented, mark-and-sweep itself is fine. + * Recursive string table resize is prevented explicitly here. + */ + + heap->pf_prevent_count++; + DUK_ASSERT(heap->pf_prevent_count != 0); /* Wrap. */ + +#if defined(DUK_USE_STRTAB_TORTURE) && defined(DUK__STRTAB_RESIZE_CHECK) + duk__strtable_resize_torture(heap); +#endif + + /* String table grow/shrink check. Because of chaining (and no + * accumulation issues as with hash probe chains and DELETED + * markers) there's never a mandatory need to resize right now. + * Check for the resize only periodically, based on st_count + * bit pattern. Because string table removal doesn't do a shrink + * check, we do that also here. + * + * Do the resize and possible grow/shrink before the new duk_hstring + * has been allocated. Otherwise we may trigger a GC when the result + * duk_hstring is not yet strongly referenced. + */ + +#if defined(DUK__STRTAB_RESIZE_CHECK) + if (DUK_UNLIKELY((heap->st_count & DUK_USE_STRTAB_RESIZE_CHECK_MASK) == 0)) { + duk__strtable_resize_check(heap); + } +#endif + + /* External string check (low memory optimization). */ + +#if defined(DUK_USE_HSTRING_EXTDATA) && defined(DUK_USE_EXTSTR_INTERN_CHECK) + extdata = (const duk_uint8_t *) DUK_USE_EXTSTR_INTERN_CHECK(heap->heap_udata, (void *) DUK_LOSE_CONST(str), (duk_size_t) blen); +#else + extdata = (const duk_uint8_t *) NULL; +#endif + + /* Allocate and initialize string, not yet linked. This may cause a + * GC which may cause other strings to be interned and inserted into + * the string table before we insert our string. Finalizer execution + * is disabled intentionally to avoid a finalizer from e.g. resizing + * a buffer used as a data area for 'str'. + */ + + res = duk__strtable_alloc_hstring(heap, str, blen, strhash, extdata); + + /* Allow side effects again: GC must be avoided until duk_hstring + * result (if successful) has been INCREF'd. + */ + DUK_ASSERT(heap->pf_prevent_count > 0); + heap->pf_prevent_count--; + + /* Alloc error handling. */ + + if (DUK_UNLIKELY(res == NULL)) { +#if defined(DUK_USE_HSTRING_EXTDATA) && defined(DUK_USE_EXTSTR_INTERN_CHECK) + if (extdata != NULL) { + DUK_USE_EXTSTR_FREE(heap->heap_udata, (const void *) extdata); + } +#endif + return NULL; + } + + /* Insert into string table. */ + +#if defined(DUK_USE_STRTAB_PTRCOMP) + slot = heap->strtable16 + (strhash & heap->st_mask); +#else + slot = heap->strtable + (strhash & heap->st_mask); +#endif + DUK_ASSERT(res->hdr.h_next == NULL); /* This is the case now, but unnecessary zeroing/NULLing. */ + res->hdr.h_next = DUK__HEAPPTR_DEC16(heap, *slot); + *slot = DUK__HEAPPTR_ENC16(heap, res); + + /* Update string count only for successful inserts. */ + +#if defined(DUK__STRTAB_RESIZE_CHECK) + heap->st_count++; +#endif + + /* The duk_hstring is in the string table but is not yet strongly + * reachable. Calling code MUST NOT make any allocations or other + * side effects before the duk_hstring has been INCREF'd and made + * reachable. + */ + + return res; +} + +/* + * Intern a string from str/blen, returning either an existing duk_hstring + * or adding a new one into the string table. The input string does -not- + * need to be NUL terminated. + * + * The input 'str' argument may point to a Duktape managed data area such as + * the data area of a dynamic buffer. It's crucial to avoid any side effects + * that might affect the data area (e.g. resize the dynamic buffer, or write + * to the buffer) before the string is fully interned. + */ + +#if defined(DUK_USE_ROM_STRINGS) +DUK_LOCAL duk_hstring *duk__strtab_romstring_lookup(duk_heap *heap, const duk_uint8_t *str, duk_size_t blen, duk_uint32_t strhash) { + duk_size_t lookup_hash; + duk_hstring *curr; + + DUK_ASSERT(heap != NULL); + DUK_UNREF(heap); + + lookup_hash = (blen << 4); + if (blen > 0) { + lookup_hash += str[0]; + } + lookup_hash &= 0xff; + + curr = (duk_hstring *) DUK_LOSE_CONST(duk_rom_strings_lookup[lookup_hash]); + while (curr != NULL) { + /* Unsafe memcmp() because for zero blen, str may be NULL. */ + if (strhash == DUK_HSTRING_GET_HASH(curr) && + blen == DUK_HSTRING_GET_BYTELEN(curr) && + duk_memcmp_unsafe((const void *) str, (const void *) DUK_HSTRING_GET_DATA(curr), blen) == 0) { + DUK_DDD(DUK_DDDPRINT("intern check: rom string: %!O, computed hash 0x%08lx, rom hash 0x%08lx", + curr, (unsigned long) strhash, (unsigned long) DUK_HSTRING_GET_HASH(curr))); + return curr; + } + curr = curr->hdr.h_next; + } + + return NULL; +} +#endif /* DUK_USE_ROM_STRINGS */ + +DUK_INTERNAL duk_hstring *duk_heap_strtable_intern(duk_heap *heap, const duk_uint8_t *str, duk_uint32_t blen) { + duk_uint32_t strhash; + duk_hstring *h; + + DUK_DDD(DUK_DDDPRINT("intern check: heap=%p, str=%p, blen=%lu", (void *) heap, (const void *) str, (unsigned long) blen)); + + /* Preliminaries. */ + + /* XXX: maybe just require 'str != NULL' even for zero size? */ + DUK_ASSERT(heap != NULL); + DUK_ASSERT(blen == 0 || str != NULL); + DUK_ASSERT(blen <= DUK_HSTRING_MAX_BYTELEN); /* Caller is responsible for ensuring this. */ + strhash = duk_heap_hashstring(heap, str, (duk_size_t) blen); + + /* String table lookup. */ + + DUK_ASSERT(DUK__GET_STRTABLE(heap) != NULL); + DUK_ASSERT(heap->st_size > 0); + DUK_ASSERT(heap->st_size == heap->st_mask + 1); +#if defined(DUK_USE_STRTAB_PTRCOMP) + h = DUK__HEAPPTR_DEC16(heap, heap->strtable16[strhash & heap->st_mask]); +#else + h = heap->strtable[strhash & heap->st_mask]; +#endif + while (h != NULL) { + if (DUK_HSTRING_GET_HASH(h) == strhash && + DUK_HSTRING_GET_BYTELEN(h) == blen && + duk_memcmp_unsafe((const void *) str, (const void *) DUK_HSTRING_GET_DATA(h), (size_t) blen) == 0) { + /* Found existing entry. */ + DUK_STATS_INC(heap, stats_strtab_intern_hit); + return h; + } + h = h->hdr.h_next; + } + + /* ROM table lookup. Because this lookup is slower, do it only after + * RAM lookup. This works because no ROM string is ever interned into + * the RAM string table. + */ + +#if defined(DUK_USE_ROM_STRINGS) + h = duk__strtab_romstring_lookup(heap, str, blen, strhash); + if (h != NULL) { + DUK_STATS_INC(heap, stats_strtab_intern_hit); + return h; + } +#endif + + /* Not found in string table; insert. */ + + DUK_STATS_INC(heap, stats_strtab_intern_miss); + h = duk__strtable_do_intern(heap, str, blen, strhash); + return h; /* may be NULL */ +} + +/* + * Intern a string from u32. + */ + +/* XXX: Could arrange some special handling because we know that the result + * will have an arridx flag and an ASCII flag, won't need a clen check, etc. + */ + +DUK_INTERNAL duk_hstring *duk_heap_strtable_intern_u32(duk_heap *heap, duk_uint32_t val) { + duk_uint8_t buf[DUK__STRTAB_U32_MAX_STRLEN]; + duk_uint8_t *p; + + DUK_ASSERT(heap != NULL); + + /* This is smaller and faster than a %lu sprintf. */ + p = buf + sizeof(buf); + do { + p--; + *p = duk_lc_digits[val % 10]; + val = val / 10; + } while (val != 0); /* For val == 0, emit exactly one '0'. */ + DUK_ASSERT(p >= buf); + + return duk_heap_strtable_intern(heap, (const duk_uint8_t *) p, (duk_uint32_t) ((buf + sizeof(buf)) - p)); +} + +/* + * Checked convenience variants. + * + * XXX: Because the main use case is for the checked variants, make them the + * main functionality and provide a safe variant separately (it is only needed + * during heap init). The problem with that is that longjmp state and error + * creation must already be possible to throw. + */ + +DUK_INTERNAL duk_hstring *duk_heap_strtable_intern_checked(duk_hthread *thr, const duk_uint8_t *str, duk_uint32_t blen) { + duk_hstring *res; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(blen == 0 || str != NULL); + + res = duk_heap_strtable_intern(thr->heap, str, blen); + if (DUK_UNLIKELY(res == NULL)) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); + } + return res; +} + +#if defined(DUK_USE_LITCACHE_SIZE) +DUK_LOCAL duk_uint_t duk__strtable_litcache_key(const duk_uint8_t *str, duk_uint32_t blen) { + duk_uintptr_t key; + + DUK_ASSERT(DUK_USE_LITCACHE_SIZE > 0); + DUK_ASSERT(DUK_IS_POWER_OF_TWO((duk_uint_t) DUK_USE_LITCACHE_SIZE)); + + key = (duk_uintptr_t) blen ^ (duk_uintptr_t) str; + key &= (duk_uintptr_t) (DUK_USE_LITCACHE_SIZE - 1); /* Assumes size is power of 2. */ + /* Due to masking, cast is in 32-bit range. */ + DUK_ASSERT(key <= DUK_UINT_MAX); + return (duk_uint_t) key; +} + +DUK_INTERNAL duk_hstring *duk_heap_strtable_intern_literal_checked(duk_hthread *thr, const duk_uint8_t *str, duk_uint32_t blen) { + duk_uint_t key; + duk_litcache_entry *ent; + duk_hstring *h; + + /* Fast path check: literal exists in literal cache. */ + key = duk__strtable_litcache_key(str, blen); + ent = thr->heap->litcache + key; + if (ent->addr == str) { + DUK_DD(DUK_DDPRINT("intern check for cached, pinned literal: str=%p, blen=%ld -> duk_hstring %!O", + (const void *) str, (long) blen, (duk_heaphdr *) ent->h)); + DUK_ASSERT(ent->h != NULL); + DUK_ASSERT(DUK_HSTRING_HAS_PINNED_LITERAL(ent->h)); + DUK_STATS_INC(thr->heap, stats_strtab_litcache_hit); + return ent->h; + } + + /* Intern and update (overwrite) cache entry. */ + h = duk_heap_strtable_intern_checked(thr, str, blen); + ent->addr = str; + ent->h = h; + DUK_STATS_INC(thr->heap, stats_strtab_litcache_miss); + + /* Pin the duk_hstring until the next mark-and-sweep. This means + * litcache entries don't need to be invalidated until the next + * mark-and-sweep as their target duk_hstring is not freed before + * the mark-and-sweep happens. The pin remains even if the literal + * cache entry is overwritten, and is still useful to avoid string + * table traffic. + */ + if (!DUK_HSTRING_HAS_PINNED_LITERAL(h)) { + DUK_DD(DUK_DDPRINT("pin duk_hstring because it is a literal: %!O", (duk_heaphdr *) h)); + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)); + DUK_HSTRING_INCREF(thr, h); + DUK_HSTRING_SET_PINNED_LITERAL(h); + DUK_STATS_INC(thr->heap, stats_strtab_litcache_pin); + } + + return h; +} +#endif /* DUK_USE_LITCACHE_SIZE */ + +DUK_INTERNAL duk_hstring *duk_heap_strtable_intern_u32_checked(duk_hthread *thr, duk_uint32_t val) { + duk_hstring *res; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + + res = duk_heap_strtable_intern_u32(thr->heap, val); + if (DUK_UNLIKELY(res == NULL)) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); + } + return res; +} + +/* + * Remove (unlink) a string from the string table. + * + * Just unlinks the duk_hstring, leaving link pointers as garbage. + * Caller must free the string itself. + */ + +#if defined(DUK_USE_REFERENCE_COUNTING) +/* Unlink without a 'prev' pointer. */ +DUK_INTERNAL void duk_heap_strtable_unlink(duk_heap *heap, duk_hstring *h) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *slot; +#else + duk_hstring **slot; +#endif + duk_hstring *other; + duk_hstring *prev; + + DUK_DDD(DUK_DDDPRINT("remove: heap=%p, h=%p, blen=%lu, strhash=%lx", + (void *) heap, (void *) h, + (unsigned long) (h != NULL ? DUK_HSTRING_GET_BYTELEN(h) : 0), + (unsigned long) (h != NULL ? DUK_HSTRING_GET_HASH(h) : 0))); + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(h != NULL); + +#if defined(DUK__STRTAB_RESIZE_CHECK) + DUK_ASSERT(heap->st_count > 0); + heap->st_count--; +#endif + +#if defined(DUK_USE_STRTAB_PTRCOMP) + slot = heap->strtable16 + (DUK_HSTRING_GET_HASH(h) & heap->st_mask); +#else + slot = heap->strtable + (DUK_HSTRING_GET_HASH(h) & heap->st_mask); +#endif + other = DUK__HEAPPTR_DEC16(heap, *slot); + DUK_ASSERT(other != NULL); /* At least argument string is in the chain. */ + + prev = NULL; + while (other != h) { + prev = other; + other = other->hdr.h_next; + DUK_ASSERT(other != NULL); /* We'll eventually find 'h'. */ + } + if (prev != NULL) { + /* Middle of list. */ + prev->hdr.h_next = h->hdr.h_next; + } else { + /* Head of list. */ + *slot = DUK__HEAPPTR_ENC16(heap, h->hdr.h_next); + } + + /* There's no resize check on a string free. The next string + * intern will do one. + */ +} +#endif /* DUK_USE_REFERENCE_COUNTING */ + +/* Unlink with a 'prev' pointer. */ +DUK_INTERNAL void duk_heap_strtable_unlink_prev(duk_heap *heap, duk_hstring *h, duk_hstring *prev) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *slot; +#else + duk_hstring **slot; +#endif + + DUK_DDD(DUK_DDDPRINT("remove: heap=%p, prev=%p, h=%p, blen=%lu, strhash=%lx", + (void *) heap, (void *) prev, (void *) h, + (unsigned long) (h != NULL ? DUK_HSTRING_GET_BYTELEN(h) : 0), + (unsigned long) (h != NULL ? DUK_HSTRING_GET_HASH(h) : 0))); + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(h != NULL); + DUK_ASSERT(prev == NULL || prev->hdr.h_next == h); + +#if defined(DUK__STRTAB_RESIZE_CHECK) + DUK_ASSERT(heap->st_count > 0); + heap->st_count--; +#endif + + if (prev != NULL) { + /* Middle of list. */ + prev->hdr.h_next = h->hdr.h_next; + } else { + /* Head of list. */ +#if defined(DUK_USE_STRTAB_PTRCOMP) + slot = heap->strtable16 + (DUK_HSTRING_GET_HASH(h) & heap->st_mask); +#else + slot = heap->strtable + (DUK_HSTRING_GET_HASH(h) & heap->st_mask); +#endif + DUK_ASSERT(DUK__HEAPPTR_DEC16(heap, *slot) == h); + *slot = DUK__HEAPPTR_ENC16(heap, h->hdr.h_next); + } +} + +/* + * Force string table resize check in mark-and-sweep. + */ + +DUK_INTERNAL void duk_heap_strtable_force_resize(duk_heap *heap) { + /* Does only one grow/shrink step if needed. The heap->st_resizing + * flag protects against recursive resizing. + */ + + DUK_ASSERT(heap != NULL); + DUK_UNREF(heap); + +#if defined(DUK__STRTAB_RESIZE_CHECK) +#if defined(DUK_USE_STRTAB_PTRCOMP) + if (heap->strtable16 != NULL) { +#else + if (heap->strtable != NULL) { +#endif + duk__strtable_resize_check(heap); + } +#endif +} + +/* + * Free strings in the string table and the string table itself. + */ + +DUK_INTERNAL void duk_heap_strtable_free(duk_heap *heap) { +#if defined(DUK_USE_STRTAB_PTRCOMP) + duk_uint16_t *strtable; + duk_uint16_t *st; +#else + duk_hstring **strtable; + duk_hstring **st; +#endif + duk_hstring *h; + + DUK_ASSERT(heap != NULL); + +#if defined(DUK_USE_ASSERTIONS) + duk__strtable_assert_checks(heap); +#endif + + /* Strtable can be NULL if heap init fails. However, in that case + * heap->st_size is 0, so strtable == strtable_end and we skip the + * loop without a special check. + */ + strtable = DUK__GET_STRTABLE(heap); + st = strtable + heap->st_size; + DUK_ASSERT(strtable != NULL || heap->st_size == 0); + + while (strtable != st) { + --st; + h = DUK__HEAPPTR_DEC16(heap, *st); + while (h) { + duk_hstring *h_next; + h_next = h->hdr.h_next; + + /* Strings may have inner refs (extdata) in some cases. */ + duk_free_hstring(heap, h); + + h = h_next; + } + } + + DUK_FREE(heap, strtable); +} + +/* automatic undefs */ +#undef DUK__GET_STRTABLE +#undef DUK__HEAPPTR_DEC16 +#undef DUK__HEAPPTR_ENC16 +#undef DUK__STRTAB_U32_MAX_STRLEN +#line 1 "duk_hobject_alloc.c" +/* + * Hobject allocation. + * + * Provides primitive allocation functions for all object types (plain object, + * compiled function, native function, thread). The object return is not yet + * in "heap allocated" list and has a refcount of zero, so caller must careful. + */ + +/* XXX: In most cases there's no need for plain allocation without pushing + * to the value stack. Maybe rework contract? + */ + +/* #include duk_internal.h -> already included */ + +/* + * Helpers. + */ + +DUK_LOCAL void duk__init_object_parts(duk_heap *heap, duk_uint_t hobject_flags, duk_hobject *obj) { + DUK_ASSERT(obj != NULL); + /* Zeroed by caller. */ + + obj->hdr.h_flags = hobject_flags | DUK_HTYPE_OBJECT; + DUK_ASSERT(DUK_HEAPHDR_GET_TYPE(&obj->hdr) == DUK_HTYPE_OBJECT); /* Assume zero shift. */ + +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + DUK_HOBJECT_SET_PROTOTYPE(heap, obj, NULL); + DUK_HOBJECT_SET_PROPS(heap, obj, NULL); +#endif +#if defined(DUK_USE_HEAPPTR16) + /* Zero encoded pointer is required to match NULL. */ + DUK_HEAPHDR_SET_NEXT(heap, &obj->hdr, NULL); +#if defined(DUK_USE_DOUBLE_LINKED_HEAP) + DUK_HEAPHDR_SET_PREV(heap, &obj->hdr, NULL); +#endif +#endif + DUK_ASSERT_HEAPHDR_LINKS(heap, &obj->hdr); + DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(heap, &obj->hdr); + + /* obj->props is intentionally left as NULL, and duk_hobject_props.c must deal + * with this properly. This is intentional: empty objects consume a minimum + * amount of memory. Further, an initial allocation might fail and cause + * 'obj' to "leak" (require a mark-and-sweep) since it is not reachable yet. + */ +} + +DUK_LOCAL void *duk__hobject_alloc_init(duk_hthread *thr, duk_uint_t hobject_flags, duk_size_t size) { + void *res; + + res = (void *) DUK_ALLOC_CHECKED_ZEROED(thr, size); + DUK_ASSERT(res != NULL); + duk__init_object_parts(thr->heap, hobject_flags, (duk_hobject *) res); + return res; +} + +/* + * Allocate an duk_hobject. + * + * The allocated object has no allocation for properties; the caller may + * want to force a resize if a desired size is known. + * + * The allocated object has zero reference count and is not reachable. + * The caller MUST make the object reachable and increase its reference + * count before invoking any operation that might require memory allocation. + */ + +DUK_INTERNAL duk_hobject *duk_hobject_alloc_unchecked(duk_heap *heap, duk_uint_t hobject_flags) { + duk_hobject *res; + + DUK_ASSERT(heap != NULL); + + /* different memory layout, alloc size, and init */ + DUK_ASSERT((hobject_flags & DUK_HOBJECT_FLAG_COMPFUNC) == 0); + DUK_ASSERT((hobject_flags & DUK_HOBJECT_FLAG_NATFUNC) == 0); + DUK_ASSERT((hobject_flags & DUK_HOBJECT_FLAG_BOUNDFUNC) == 0); + + res = (duk_hobject *) DUK_ALLOC_ZEROED(heap, sizeof(duk_hobject)); + if (DUK_UNLIKELY(res == NULL)) { + return NULL; + } + DUK_ASSERT(!DUK_HOBJECT_IS_THREAD(res)); + + duk__init_object_parts(heap, hobject_flags, res); + + DUK_ASSERT(!DUK_HOBJECT_IS_THREAD(res)); + return res; +} + +DUK_INTERNAL duk_hobject *duk_hobject_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hobject *res; + + res = (duk_hobject *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hobject)); + return res; +} + +DUK_INTERNAL duk_hcompfunc *duk_hcompfunc_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hcompfunc *res; + + res = (duk_hcompfunc *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hcompfunc)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) +#if defined(DUK_USE_HEAPPTR16) + /* NULL pointer is required to encode to zero, so memset is enough. */ +#else + res->data = NULL; + res->funcs = NULL; + res->bytecode = NULL; +#endif + res->lex_env = NULL; + res->var_env = NULL; +#endif + + return res; +} + +DUK_INTERNAL duk_hnatfunc *duk_hnatfunc_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hnatfunc *res; + + res = (duk_hnatfunc *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hnatfunc)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->func = NULL; +#endif + + return res; +} + +DUK_INTERNAL duk_hboundfunc *duk_hboundfunc_alloc(duk_heap *heap, duk_uint_t hobject_flags) { + duk_hboundfunc *res; + + res = (duk_hboundfunc *) DUK_ALLOC(heap, sizeof(duk_hboundfunc)); + if (!res) { + return NULL; + } + duk_memzero(res, sizeof(duk_hboundfunc)); + + duk__init_object_parts(heap, hobject_flags, &res->obj); + + DUK_TVAL_SET_UNDEFINED(&res->target); + DUK_TVAL_SET_UNDEFINED(&res->this_binding); + +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->args = NULL; +#endif + + return res; +} + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_INTERNAL duk_hbufobj *duk_hbufobj_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hbufobj *res; + + res = (duk_hbufobj *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hbufobj)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->buf = NULL; + res->buf_prop = NULL; +#endif + + DUK_ASSERT_HBUFOBJ_VALID(res); + return res; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* Allocate a new thread. + * + * Leaves the built-ins array uninitialized. The caller must either + * initialize a new global context or share existing built-ins from + * another thread. + */ +DUK_INTERNAL duk_hthread *duk_hthread_alloc_unchecked(duk_heap *heap, duk_uint_t hobject_flags) { + duk_hthread *res; + + res = (duk_hthread *) DUK_ALLOC(heap, sizeof(duk_hthread)); + if (DUK_UNLIKELY(res == NULL)) { + return NULL; + } + duk_memzero(res, sizeof(duk_hthread)); + + duk__init_object_parts(heap, hobject_flags, &res->obj); + +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->ptr_curr_pc = NULL; + res->heap = NULL; + res->valstack = NULL; + res->valstack_end = NULL; + res->valstack_alloc_end = NULL; + res->valstack_bottom = NULL; + res->valstack_top = NULL; + res->callstack_curr = NULL; + res->resumer = NULL; + res->compile_ctx = NULL, +#if defined(DUK_USE_HEAPPTR16) + res->strs16 = NULL; +#else + res->strs = NULL; +#endif + { + duk_small_uint_t i; + for (i = 0; i < DUK_NUM_BUILTINS; i++) { + res->builtins[i] = NULL; + } + } +#endif + /* When nothing is running, API calls are in non-strict mode. */ + DUK_ASSERT(res->strict == 0); + + res->heap = heap; + + /* XXX: Any reason not to merge duk_hthread_alloc.c here? */ + return res; +} + +DUK_INTERNAL duk_hthread *duk_hthread_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hthread *res; + + res = duk_hthread_alloc_unchecked(thr->heap, hobject_flags); + if (res == NULL) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return NULL;); + } + return res; +} + +DUK_INTERNAL duk_harray *duk_harray_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_harray *res; + + res = (duk_harray *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_harray)); + + DUK_ASSERT(res->length == 0); + + return res; +} + +DUK_INTERNAL duk_hdecenv *duk_hdecenv_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hdecenv *res; + + res = (duk_hdecenv *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hdecenv)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->thread = NULL; + res->varmap = NULL; +#endif + + DUK_ASSERT(res->thread == NULL); + DUK_ASSERT(res->varmap == NULL); + DUK_ASSERT(res->regbase_byteoff == 0); + + return res; +} + +DUK_INTERNAL duk_hobjenv *duk_hobjenv_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hobjenv *res; + + res = (duk_hobjenv *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hobjenv)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + res->target = NULL; +#endif + + DUK_ASSERT(res->target == NULL); + + return res; +} + +DUK_INTERNAL duk_hproxy *duk_hproxy_alloc(duk_hthread *thr, duk_uint_t hobject_flags) { + duk_hproxy *res; + + res = (duk_hproxy *) duk__hobject_alloc_init(thr, hobject_flags, sizeof(duk_hproxy)); + + /* Leave ->target and ->handler uninitialized, as caller will always + * explicitly initialize them before any side effects are possible. + */ + + return res; +} +#line 1 "duk_hobject_enum.c" +/* + * Object enumeration support. + * + * Creates an internal enumeration state object to be used e.g. with for-in + * enumeration. The state object contains a snapshot of target object keys + * and internal control state for enumeration. Enumerator flags allow caller + * to e.g. request internal/non-enumerable properties, and to enumerate only + * "own" properties. + * + * Also creates the result value for e.g. Object.keys() based on the same + * internal structure. + * + * This snapshot-based enumeration approach is used to simplify enumeration: + * non-snapshot-based approaches are difficult to reconcile with mutating + * the enumeration target, running multiple long-lived enumerators at the + * same time, garbage collection details, etc. The downside is that the + * enumerator object is memory inefficient especially for iterating arrays. + */ + +/* #include duk_internal.h -> already included */ + +/* XXX: identify enumeration target with an object index (not top of stack) */ + +/* First enumerated key index in enumerator object, must match exactly the + * number of control properties inserted to the enumerator. + */ +#define DUK__ENUM_START_INDEX 2 + +/* Current implementation suffices for ES2015 for now because there's no symbol + * sorting, so commented out for now. + */ + +/* + * Helper to sort enumeration keys using a callback for pairwise duk_hstring + * comparisons. The keys are in the enumeration object entry part, starting + * from DUK__ENUM_START_INDEX, and the entry part is dense. Entry part values + * are all "true", e.g. "1" -> true, "3" -> true, "foo" -> true, "2" -> true, + * so it suffices to just switch keys without switching values. + * + * ES2015 [[OwnPropertyKeys]] enumeration order for ordinary objects: + * (1) array indices in ascending order, + * (2) non-array-index keys in insertion order, and + * (3) symbols in insertion order. + * http://www.ecma-international.org/ecma-262/6.0/#sec-ordinary-object-internal-methods-and-internal-slots-ownpropertykeys. + * + * This rule is applied to "own properties" at each inheritance level; + * non-duplicate parent keys always follow child keys. For example, + * an inherited array index will enumerate -after- a symbol in the + * child. + * + * Insertion sort is used because (1) it's simple and compact, (2) works + * in-place, (3) minimizes operations if data is already nearly sorted, + * (4) doesn't reorder elements considered equal. + * http://en.wikipedia.org/wiki/Insertion_sort + */ + +/* Sort key, must hold array indices, "not array index" marker, and one more + * higher value for symbols. + */ +#if !defined(DUK_USE_SYMBOL_BUILTIN) +typedef duk_uint32_t duk__sort_key_t; +#elif defined(DUK_USE_64BIT_OPS) +typedef duk_uint64_t duk__sort_key_t; +#else +typedef duk_double_t duk__sort_key_t; +#endif + +/* Get sort key for a duk_hstring. */ +DUK_LOCAL duk__sort_key_t duk__hstring_sort_key(duk_hstring *x) { + duk__sort_key_t val; + + /* For array indices [0,0xfffffffe] use the array index as is. + * For strings, use 0xffffffff, the marker 'arridx' already in + * duk_hstring. For symbols, any value above 0xffffffff works, + * as long as it is the same for all symbols; currently just add + * the masked flag field into the arridx temporary. + */ + DUK_ASSERT(x != NULL); + DUK_ASSERT(!DUK_HSTRING_HAS_SYMBOL(x) || DUK_HSTRING_GET_ARRIDX_FAST(x) == DUK_HSTRING_NO_ARRAY_INDEX); + + val = (duk__sort_key_t) DUK_HSTRING_GET_ARRIDX_FAST(x); + +#if defined(DUK_USE_SYMBOL_BUILTIN) + val = val + (duk__sort_key_t) (DUK_HEAPHDR_GET_FLAGS_RAW((duk_heaphdr *) x) & DUK_HSTRING_FLAG_SYMBOL); +#endif + + return (duk__sort_key_t) val; +} + +/* Insert element 'b' after element 'a'? */ +DUK_LOCAL duk_bool_t duk__sort_compare_es6(duk_hstring *a, duk_hstring *b, duk__sort_key_t val_b) { + duk__sort_key_t val_a; + + DUK_ASSERT(a != NULL); + DUK_ASSERT(b != NULL); + DUK_UNREF(b); /* Not actually needed now, val_b suffices. */ + + val_a = duk__hstring_sort_key(a); + + if (val_a > val_b) { + return 0; + } else { + return 1; + } +} + +DUK_LOCAL void duk__sort_enum_keys_es6(duk_hthread *thr, duk_hobject *h_obj, duk_int_fast32_t idx_start, duk_int_fast32_t idx_end) { + duk_hstring **keys; + duk_int_fast32_t idx; + + DUK_ASSERT(h_obj != NULL); + DUK_ASSERT(idx_start >= DUK__ENUM_START_INDEX); + DUK_ASSERT(idx_end >= idx_start); + DUK_UNREF(thr); + + if (idx_end <= idx_start + 1) { + return; /* Zero or one element(s). */ + } + + keys = DUK_HOBJECT_E_GET_KEY_BASE(thr->heap, h_obj); + + for (idx = idx_start + 1; idx < idx_end; idx++) { + duk_hstring *h_curr; + duk_int_fast32_t idx_insert; + duk__sort_key_t val_curr; + + h_curr = keys[idx]; + DUK_ASSERT(h_curr != NULL); + + /* Scan backwards for insertion place. This works very well + * when the elements are nearly in order which is the common + * (and optimized for) case. + */ + + val_curr = duk__hstring_sort_key(h_curr); /* Remains same during scanning. */ + for (idx_insert = idx - 1; idx_insert >= idx_start; idx_insert--) { + duk_hstring *h_insert; + h_insert = keys[idx_insert]; + DUK_ASSERT(h_insert != NULL); + + if (duk__sort_compare_es6(h_insert, h_curr, val_curr)) { + break; + } + } + /* If we're out of indices, idx_insert == idx_start - 1 and idx_insert++ + * brings us back to idx_start. + */ + idx_insert++; + DUK_ASSERT(idx_insert >= 0 && idx_insert <= idx); + + /* .-- p_insert .-- p_curr + * v v + * | ... | insert | ... | curr + */ + + /* This could also done when the keys are in order, i.e. + * idx_insert == idx. The result would be an unnecessary + * memmove() but we use an explicit check because the keys + * are very often in order already. + */ + if (idx != idx_insert) { + duk_memmove((void *) (keys + idx_insert + 1), + (const void *) (keys + idx_insert), + ((size_t) (idx - idx_insert) * sizeof(duk_hstring *))); + keys[idx_insert] = h_curr; + } + } +} + +/* + * Create an internal enumerator object E, which has its keys ordered + * to match desired enumeration ordering. Also initialize internal control + * properties for enumeration. + * + * Note: if an array was used to hold enumeration keys instead, an array + * scan would be needed to eliminate duplicates found in the prototype chain. + */ + +DUK_LOCAL void duk__add_enum_key(duk_hthread *thr, duk_hstring *k) { + /* 'k' may be unreachable on entry so must push without any + * potential for GC. + */ + duk_push_hstring(thr, k); + duk_push_true(thr); + duk_put_prop(thr, -3); +} + +DUK_LOCAL void duk__add_enum_key_stridx(duk_hthread *thr, duk_small_uint_t stridx) { + duk__add_enum_key(thr, DUK_HTHREAD_GET_STRING(thr, stridx)); +} + +DUK_INTERNAL void duk_hobject_enumerator_create(duk_hthread *thr, duk_small_uint_t enum_flags) { + duk_hobject *enum_target; + duk_hobject *curr; + duk_hobject *res; +#if defined(DUK_USE_ES6_PROXY) + duk_hobject *h_proxy_target; + duk_hobject *h_proxy_handler; + duk_hobject *h_trap_result; +#endif + duk_uint_fast32_t i, len; /* used for array, stack, and entry indices */ + duk_uint_fast32_t sort_start_index; + + DUK_ASSERT(thr != NULL); + + enum_target = duk_require_hobject(thr, -1); + DUK_ASSERT(enum_target != NULL); + + duk_push_bare_object(thr); + res = duk_known_hobject(thr, -1); + + /* [enum_target res] */ + + /* Target must be stored so that we can recheck whether or not + * keys still exist when we enumerate. This is not done if the + * enumeration result comes from a proxy trap as there is no + * real object to check against. + */ + duk_push_hobject(thr, enum_target); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_INT_TARGET); + + /* Initialize index so that we skip internal control keys. */ + duk_push_int(thr, DUK__ENUM_START_INDEX); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_INT_NEXT); + + /* + * Proxy object handling + */ + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_LIKELY((enum_flags & DUK_ENUM_NO_PROXY_BEHAVIOR) != 0)) { + goto skip_proxy; + } + if (DUK_LIKELY(!duk_hobject_proxy_check(enum_target, + &h_proxy_target, + &h_proxy_handler))) { + goto skip_proxy; + } + + /* XXX: share code with Object.keys() Proxy handling */ + + /* In ES2015 for-in invoked the "enumerate" trap; in ES2016 "enumerate" + * has been obsoleted and "ownKeys" is used instead. + */ + DUK_DDD(DUK_DDDPRINT("proxy enumeration")); + duk_push_hobject(thr, h_proxy_handler); + if (!duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_OWN_KEYS)) { + /* No need to replace the 'enum_target' value in stack, only the + * enum_target reference. This also ensures that the original + * enum target is reachable, which keeps the proxy and the proxy + * target reachable. We do need to replace the internal _Target. + */ + DUK_DDD(DUK_DDDPRINT("no ownKeys trap, enumerate proxy target instead")); + DUK_DDD(DUK_DDDPRINT("h_proxy_target=%!O", (duk_heaphdr *) h_proxy_target)); + enum_target = h_proxy_target; + + duk_push_hobject(thr, enum_target); /* -> [ ... enum_target res handler undefined target ] */ + duk_put_prop_stridx_short(thr, -4, DUK_STRIDX_INT_TARGET); + + duk_pop_2(thr); /* -> [ ... enum_target res ] */ + goto skip_proxy; + } + + /* [ ... enum_target res handler trap ] */ + duk_insert(thr, -2); + duk_push_hobject(thr, h_proxy_target); /* -> [ ... enum_target res trap handler target ] */ + duk_call_method(thr, 1 /*nargs*/); /* -> [ ... enum_target res trap_result ] */ + h_trap_result = duk_require_hobject(thr, -1); + DUK_UNREF(h_trap_result); + + duk_proxy_ownkeys_postprocess(thr, h_proxy_target, enum_flags); + /* -> [ ... enum_target res trap_result keys_array ] */ + + /* Copy cleaned up trap result keys into the enumerator object. */ + /* XXX: result is a dense array; could make use of that. */ + DUK_ASSERT(duk_is_array(thr, -1)); + len = (duk_uint_fast32_t) duk_get_length(thr, -1); + for (i = 0; i < len; i++) { + (void) duk_get_prop_index(thr, -1, (duk_uarridx_t) i); + DUK_ASSERT(duk_is_string(thr, -1)); /* postprocess cleaned up */ + /* [ ... enum_target res trap_result keys_array val ] */ + duk_push_true(thr); + /* [ ... enum_target res trap_result keys_array val true ] */ + duk_put_prop(thr, -5); + } + /* [ ... enum_target res trap_result keys_array ] */ + duk_pop_2(thr); + duk_remove_m2(thr); + + /* [ ... res ] */ + + /* The internal _Target property is kept pointing to the original + * enumeration target (the proxy object), so that the enumerator + * 'next' operation can read property values if so requested. The + * fact that the _Target is a proxy disables key existence check + * during enumeration. + */ + DUK_DDD(DUK_DDDPRINT("proxy enumeration, final res: %!O", (duk_heaphdr *) res)); + goto compact_and_return; + + skip_proxy: +#endif /* DUK_USE_ES6_PROXY */ + + curr = enum_target; + sort_start_index = DUK__ENUM_START_INDEX; + DUK_ASSERT(DUK_HOBJECT_GET_ENEXT(res) == DUK__ENUM_START_INDEX); + while (curr) { + duk_uint_fast32_t sort_end_index; +#if !defined(DUK_USE_PREFER_SIZE) + duk_bool_t need_sort = 0; +#endif + + /* Enumeration proceeds by inheritance level. Virtual + * properties need to be handled specially, followed by + * array part, and finally entry part. + * + * If there are array index keys in the entry part or any + * other risk of the ES2015 [[OwnPropertyKeys]] order being + * violated, need_sort is set and an explicit ES2015 sort is + * done for the inheritance level. + */ + + /* XXX: inheriting from proxy */ + + /* + * Virtual properties. + * + * String and buffer indices are virtual and always enumerable, + * 'length' is virtual and non-enumerable. Array and arguments + * object props have special behavior but are concrete. + * + * String and buffer objects don't have an array part so as long + * as virtual array index keys are enumerated first, we don't + * need to set need_sort. + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + if (DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(curr) || DUK_HOBJECT_IS_BUFOBJ(curr)) { +#else + if (DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(curr)) { +#endif + duk_bool_t have_length = 1; + + /* String and buffer enumeration behavior is identical now, + * so use shared handler. + */ + if (DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(curr)) { + duk_hstring *h_val; + h_val = duk_hobject_get_internal_value_string(thr->heap, curr); + DUK_ASSERT(h_val != NULL); /* string objects must not created without internal value */ + len = (duk_uint_fast32_t) DUK_HSTRING_GET_CHARLEN(h_val); + } +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + else { + duk_hbufobj *h_bufobj; + DUK_ASSERT(DUK_HOBJECT_IS_BUFOBJ(curr)); + h_bufobj = (duk_hbufobj *) curr; + + if (h_bufobj == NULL || !h_bufobj->is_typedarray) { + /* Zero length seems like a good behavior for neutered buffers. + * ArrayBuffer (non-view) and DataView don't have index properties + * or .length property. + */ + len = 0; + have_length = 0; + } else { + /* There's intentionally no check for + * current underlying buffer length. + */ + len = (duk_uint_fast32_t) (h_bufobj->length >> h_bufobj->shift); + } + } +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + + for (i = 0; i < len; i++) { + duk_hstring *k; + + /* This is a bit fragile: the string is not + * reachable until it is pushed by the helper. + */ + k = duk_heap_strtable_intern_u32_checked(thr, (duk_uint32_t) i); + DUK_ASSERT(k); + + duk__add_enum_key(thr, k); + + /* [enum_target res] */ + } + + /* 'length' and other virtual properties are not + * enumerable, but are included if non-enumerable + * properties are requested. + */ + + if (have_length && (enum_flags & DUK_ENUM_INCLUDE_NONENUMERABLE)) { + duk__add_enum_key_stridx(thr, DUK_STRIDX_LENGTH); + } + } + + /* + * Array part + */ + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ASIZE(curr); i++) { + duk_hstring *k; + duk_tval *tv; + + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, curr, i); + if (DUK_TVAL_IS_UNUSED(tv)) { + continue; + } + k = duk_heap_strtable_intern_u32_checked(thr, (duk_uint32_t) i); /* Fragile reachability. */ + DUK_ASSERT(k); + + duk__add_enum_key(thr, k); + + /* [enum_target res] */ + } + + if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(curr)) { + /* Array .length comes after numeric indices. */ + if (enum_flags & DUK_ENUM_INCLUDE_NONENUMERABLE) { + duk__add_enum_key_stridx(thr, DUK_STRIDX_LENGTH); + } + } + + /* + * Entries part + */ + + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(curr); i++) { + duk_hstring *k; + + k = DUK_HOBJECT_E_GET_KEY(thr->heap, curr, i); + if (!k) { + continue; + } + if (!(enum_flags & DUK_ENUM_INCLUDE_NONENUMERABLE) && + !DUK_HOBJECT_E_SLOT_IS_ENUMERABLE(thr->heap, curr, i)) { + continue; + } + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(k))) { + if (!(enum_flags & DUK_ENUM_INCLUDE_HIDDEN) && + DUK_HSTRING_HAS_HIDDEN(k)) { + continue; + } + if (!(enum_flags & DUK_ENUM_INCLUDE_SYMBOLS)) { + continue; + } +#if !defined(DUK_USE_PREFER_SIZE) + need_sort = 1; +#endif + } else { + DUK_ASSERT(!DUK_HSTRING_HAS_HIDDEN(k)); /* would also have symbol flag */ + if (enum_flags & DUK_ENUM_EXCLUDE_STRINGS) { + continue; + } + } + if (DUK_HSTRING_HAS_ARRIDX(k)) { + /* This in currently only possible if the + * object has no array part: the array part + * is exhaustive when it is present. + */ +#if !defined(DUK_USE_PREFER_SIZE) + need_sort = 1; +#endif + } else { + if (enum_flags & DUK_ENUM_ARRAY_INDICES_ONLY) { + continue; + } + } + + DUK_ASSERT(DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, curr, i) || + !DUK_TVAL_IS_UNUSED(&DUK_HOBJECT_E_GET_VALUE_PTR(thr->heap, curr, i)->v)); + + duk__add_enum_key(thr, k); + + /* [enum_target res] */ + } + + /* Sort enumerated keys according to ES2015 requirements for + * the "inheritance level" just processed. This is far from + * optimal, ES2015 semantics could be achieved more efficiently + * by handling array index string keys (and symbol keys) + * specially above in effect doing the sort inline. + * + * Skip the sort if array index sorting is requested because + * we must consider all keys, also inherited, so an explicit + * sort is done for the whole result after we're done with the + * prototype chain. + * + * Also skip the sort if need_sort == 0, i.e. we know for + * certain that the enumerated order is already correct. + */ + sort_end_index = DUK_HOBJECT_GET_ENEXT(res); + + if (!(enum_flags & DUK_ENUM_SORT_ARRAY_INDICES)) { +#if defined(DUK_USE_PREFER_SIZE) + duk__sort_enum_keys_es6(thr, res, (duk_int_fast32_t) sort_start_index, (duk_int_fast32_t) sort_end_index); +#else + if (need_sort) { + DUK_DDD(DUK_DDDPRINT("need to sort")); + duk__sort_enum_keys_es6(thr, res, (duk_int_fast32_t) sort_start_index, (duk_int_fast32_t) sort_end_index); + } else { + DUK_DDD(DUK_DDDPRINT("no need to sort")); + } +#endif + } + + sort_start_index = sort_end_index; + + if (enum_flags & DUK_ENUM_OWN_PROPERTIES_ONLY) { + break; + } + + curr = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, curr); + } + + /* [enum_target res] */ + + duk_remove_m2(thr); + + /* [res] */ + + if (enum_flags & DUK_ENUM_SORT_ARRAY_INDICES) { + /* Some E5/E5.1 algorithms require that array indices are iterated + * in a strictly ascending order. This is the case for e.g. + * Array.prototype.forEach() and JSON.stringify() PropertyList + * handling. The caller can request an explicit sort in these + * cases. + */ + + /* Sort to ES2015 order which works for pure array incides but + * also for mixed keys. + */ + duk__sort_enum_keys_es6(thr, res, (duk_int_fast32_t) DUK__ENUM_START_INDEX, (duk_int_fast32_t) DUK_HOBJECT_GET_ENEXT(res)); + } + +#if defined(DUK_USE_ES6_PROXY) + compact_and_return: +#endif + /* compact; no need to seal because object is internal */ + duk_hobject_compact_props(thr, res); + + DUK_DDD(DUK_DDDPRINT("created enumerator object: %!iT", (duk_tval *) duk_get_tval(thr, -1))); +} + +/* + * Returns non-zero if a key and/or value was enumerated, and: + * + * [enum] -> [key] (get_value == 0) + * [enum] -> [key value] (get_value == 1) + * + * Returns zero without pushing anything on the stack otherwise. + */ +DUK_INTERNAL duk_bool_t duk_hobject_enumerator_next(duk_hthread *thr, duk_bool_t get_value) { + duk_hobject *e; + duk_hobject *enum_target; + duk_hstring *res = NULL; + duk_uint_fast32_t idx; + duk_bool_t check_existence; + + DUK_ASSERT(thr != NULL); + + /* [... enum] */ + + e = duk_require_hobject(thr, -1); + + /* XXX use get tval ptr, more efficient */ + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_NEXT); + idx = (duk_uint_fast32_t) duk_require_uint(thr, -1); + duk_pop(thr); + DUK_DDD(DUK_DDDPRINT("enumeration: index is: %ld", (long) idx)); + + /* Enumeration keys are checked against the enumeration target (to see + * that they still exist). In the proxy enumeration case _Target will + * be the proxy, and checking key existence against the proxy is not + * required (or sensible, as the keys may be fully virtual). + */ + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_TARGET); + enum_target = duk_require_hobject(thr, -1); + DUK_ASSERT(enum_target != NULL); +#if defined(DUK_USE_ES6_PROXY) + check_existence = (!DUK_HOBJECT_IS_PROXY(enum_target)); +#else + check_existence = 1; +#endif + duk_pop(thr); /* still reachable */ + + DUK_DDD(DUK_DDDPRINT("getting next enum value, enum_target=%!iO, enumerator=%!iT", + (duk_heaphdr *) enum_target, (duk_tval *) duk_get_tval(thr, -1))); + + /* no array part */ + for (;;) { + duk_hstring *k; + + if (idx >= DUK_HOBJECT_GET_ENEXT(e)) { + DUK_DDD(DUK_DDDPRINT("enumeration: ran out of elements")); + break; + } + + /* we know these because enum objects are internally created */ + k = DUK_HOBJECT_E_GET_KEY(thr->heap, e, idx); + DUK_ASSERT(k != NULL); + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, e, idx)); + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(&DUK_HOBJECT_E_GET_VALUE(thr->heap, e, idx).v)); + + idx++; + + /* recheck that the property still exists */ + if (check_existence && !duk_hobject_hasprop_raw(thr, enum_target, k)) { + DUK_DDD(DUK_DDDPRINT("property deleted during enumeration, skip")); + continue; + } + + DUK_DDD(DUK_DDDPRINT("enumeration: found element, key: %!O", (duk_heaphdr *) k)); + res = k; + break; + } + + DUK_DDD(DUK_DDDPRINT("enumeration: updating next index to %ld", (long) idx)); + + duk_push_u32(thr, (duk_uint32_t) idx); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_INT_NEXT); + + /* [... enum] */ + + if (res) { + duk_push_hstring(thr, res); + if (get_value) { + duk_push_hobject(thr, enum_target); + duk_dup_m2(thr); /* -> [... enum key enum_target key] */ + duk_get_prop(thr, -2); /* -> [... enum key enum_target val] */ + duk_remove_m2(thr); /* -> [... enum key val] */ + duk_remove(thr, -3); /* -> [... key val] */ + } else { + duk_remove_m2(thr); /* -> [... key] */ + } + return 1; + } else { + duk_pop(thr); /* -> [...] */ + return 0; + } +} + +/* + * Get enumerated keys in an ECMAScript array. Matches Object.keys() behavior + * described in E5 Section 15.2.3.14. + */ + +DUK_INTERNAL duk_ret_t duk_hobject_get_enumerated_keys(duk_hthread *thr, duk_small_uint_t enum_flags) { + duk_hobject *e; + duk_hstring **keys; + duk_tval *tv; + duk_uint_fast32_t count; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(duk_get_hobject(thr, -1) != NULL); + + /* Create a temporary enumerator to get the (non-duplicated) key list; + * the enumerator state is initialized without being needed, but that + * has little impact. + */ + + duk_hobject_enumerator_create(thr, enum_flags); + e = duk_known_hobject(thr, -1); + + /* [enum_target enum res] */ + + /* Create dense result array to exact size. */ + DUK_ASSERT(DUK_HOBJECT_GET_ENEXT(e) >= DUK__ENUM_START_INDEX); + count = (duk_uint32_t) (DUK_HOBJECT_GET_ENEXT(e) - DUK__ENUM_START_INDEX); + + /* XXX: uninit would be OK */ + tv = duk_push_harray_with_size_outptr(thr, (duk_uint32_t) count); + DUK_ASSERT(count == 0 || tv != NULL); + + /* Fill result array, no side effects. */ + + keys = DUK_HOBJECT_E_GET_KEY_BASE(thr->heap, e); + keys += DUK__ENUM_START_INDEX; + + while (count-- > 0) { + duk_hstring *k; + + k = *keys++; + DUK_ASSERT(k != NULL); /* enumerator must have no keys deleted */ + + DUK_TVAL_SET_STRING(tv, k); + tv++; + DUK_HSTRING_INCREF(thr, k); + } + + /* [enum_target enum res] */ + duk_remove_m2(thr); + + /* [enum_target res] */ + + return 1; /* return 1 to allow callers to tail call */ +} + +/* automatic undefs */ +#undef DUK__ENUM_START_INDEX +#line 1 "duk_hobject_misc.c" +/* + * Misc support functions + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL duk_bool_t duk_hobject_prototype_chain_contains(duk_hthread *thr, duk_hobject *h, duk_hobject *p, duk_bool_t ignore_loop) { + duk_uint_t sanity; + + DUK_ASSERT(thr != NULL); + + /* False if the object is NULL or the prototype 'p' is NULL. + * In particular, false if both are NULL (don't compare equal). + */ + if (h == NULL || p == NULL) { + return 0; + } + + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + if (h == p) { + return 1; + } + + if (sanity-- == 0) { + if (ignore_loop) { + break; + } else { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + } + h = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h); + } while (h); + + return 0; +} + +DUK_INTERNAL void duk_hobject_set_prototype_updref(duk_hthread *thr, duk_hobject *h, duk_hobject *p) { +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_hobject *tmp; + + DUK_ASSERT(h); + tmp = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, h, p); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, p); /* avoid problems if p == h->prototype */ + DUK_HOBJECT_DECREF_ALLOWNULL(thr, tmp); +#else + DUK_ASSERT(h); + DUK_UNREF(thr); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, h, p); +#endif +} +#line 1 "duk_hobject_pc2line.c" +/* + * Helpers for creating and querying pc2line debug data, which + * converts a bytecode program counter to a source line number. + * + * The run-time pc2line data is bit-packed, and documented in: + * + * doc/function-objects.rst + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_PC2LINE) + +/* Generate pc2line data for an instruction sequence, leaving a buffer on stack top. */ +DUK_INTERNAL void duk_hobject_pc2line_pack(duk_hthread *thr, duk_compiler_instr *instrs, duk_uint_fast32_t length) { + duk_hbuffer_dynamic *h_buf; + duk_bitencoder_ctx be_ctx_alloc; + duk_bitencoder_ctx *be_ctx = &be_ctx_alloc; + duk_uint32_t *hdr; + duk_size_t new_size; + duk_uint_fast32_t num_header_entries; + duk_uint_fast32_t curr_offset; + duk_int_fast32_t curr_line, next_line, diff_line; + duk_uint_fast32_t curr_pc; + duk_uint_fast32_t hdr_index; + + DUK_ASSERT(length <= DUK_COMPILER_MAX_BYTECODE_LENGTH); + + num_header_entries = (length + DUK_PC2LINE_SKIP - 1) / DUK_PC2LINE_SKIP; + curr_offset = (duk_uint_fast32_t) (sizeof(duk_uint32_t) + num_header_entries * sizeof(duk_uint32_t) * 2); + + duk_push_dynamic_buffer(thr, (duk_size_t) curr_offset); + h_buf = (duk_hbuffer_dynamic *) duk_known_hbuffer(thr, -1); + DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(h_buf) && !DUK_HBUFFER_HAS_EXTERNAL(h_buf)); + + hdr = (duk_uint32_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h_buf); + DUK_ASSERT(hdr != NULL); + hdr[0] = (duk_uint32_t) length; /* valid pc range is [0, length[ */ + + curr_pc = 0U; + while (curr_pc < length) { + new_size = (duk_size_t) (curr_offset + DUK_PC2LINE_MAX_DIFF_LENGTH); + duk_hbuffer_resize(thr, h_buf, new_size); + + hdr = (duk_uint32_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h_buf); + DUK_ASSERT(hdr != NULL); + DUK_ASSERT(curr_pc < length); + hdr_index = 1 + (curr_pc / DUK_PC2LINE_SKIP) * 2; + curr_line = (duk_int_fast32_t) instrs[curr_pc].line; + hdr[hdr_index + 0] = (duk_uint32_t) curr_line; + hdr[hdr_index + 1] = (duk_uint32_t) curr_offset; + +#if 0 + DUK_DDD(DUK_DDDPRINT("hdr[%ld]: pc=%ld line=%ld offset=%ld", + (long) (curr_pc / DUK_PC2LINE_SKIP), + (long) curr_pc, + (long) hdr[hdr_index + 0], + (long) hdr[hdr_index + 1])); +#endif + + duk_memzero(be_ctx, sizeof(*be_ctx)); + be_ctx->data = ((duk_uint8_t *) hdr) + curr_offset; + be_ctx->length = (duk_size_t) DUK_PC2LINE_MAX_DIFF_LENGTH; + + for (;;) { + curr_pc++; + if ( ((curr_pc % DUK_PC2LINE_SKIP) == 0) || /* end of diff run */ + (curr_pc >= length) ) { /* end of bytecode */ + break; + } + DUK_ASSERT(curr_pc < length); + next_line = (duk_int32_t) instrs[curr_pc].line; + diff_line = next_line - curr_line; + +#if 0 + DUK_DDD(DUK_DDDPRINT("curr_line=%ld, next_line=%ld -> diff_line=%ld", + (long) curr_line, (long) next_line, (long) diff_line)); +#endif + + if (diff_line == 0) { + /* 0 */ + duk_be_encode(be_ctx, 0, 1); + } else if (diff_line >= 1 && diff_line <= 4) { + /* 1 0 <2 bits> */ + duk_be_encode(be_ctx, (duk_uint32_t) ((0x02 << 2) + (diff_line - 1)), 4); + } else if (diff_line >= -0x80 && diff_line <= 0x7f) { + /* 1 1 0 <8 bits> */ + DUK_ASSERT(diff_line + 0x80 >= 0 && diff_line + 0x80 <= 0xff); + duk_be_encode(be_ctx, (duk_uint32_t) ((0x06 << 8) + (diff_line + 0x80)), 11); + } else { + /* 1 1 1 <32 bits> + * Encode in two parts to avoid bitencode 24-bit limitation + */ + duk_be_encode(be_ctx, (duk_uint32_t) ((0x07 << 16) + ((next_line >> 16) & 0xffff)), 19); + duk_be_encode(be_ctx, (duk_uint32_t) (next_line & 0xffff), 16); + } + + curr_line = next_line; + } + + duk_be_finish(be_ctx); + DUK_ASSERT(!be_ctx->truncated); + + /* be_ctx->offset == length of encoded bitstream */ + curr_offset += (duk_uint_fast32_t) be_ctx->offset; + } + + /* compact */ + new_size = (duk_size_t) curr_offset; + duk_hbuffer_resize(thr, h_buf, new_size); + + (void) duk_to_fixed_buffer(thr, -1, NULL); + + DUK_DDD(DUK_DDDPRINT("final pc2line data: pc_limit=%ld, length=%ld, %lf bits/opcode --> %!ixT", + (long) length, (long) new_size, (double) new_size * 8.0 / (double) length, + (duk_tval *) duk_get_tval(thr, -1))); +} + +/* PC is unsigned. If caller does PC arithmetic and gets a negative result, + * it will map to a large PC which is out of bounds and causes a zero to be + * returned. + */ +DUK_LOCAL duk_uint_fast32_t duk__hobject_pc2line_query_raw(duk_hthread *thr, duk_hbuffer_fixed *buf, duk_uint_fast32_t pc) { + duk_bitdecoder_ctx bd_ctx_alloc; + duk_bitdecoder_ctx *bd_ctx = &bd_ctx_alloc; + duk_uint32_t *hdr; + duk_uint_fast32_t start_offset; + duk_uint_fast32_t pc_limit; + duk_uint_fast32_t hdr_index; + duk_uint_fast32_t pc_base; + duk_uint_fast32_t n; + duk_uint_fast32_t curr_line; + + DUK_ASSERT(buf != NULL); + DUK_ASSERT(!DUK_HBUFFER_HAS_DYNAMIC((duk_hbuffer *) buf) && !DUK_HBUFFER_HAS_EXTERNAL((duk_hbuffer *) buf)); + DUK_UNREF(thr); + + /* + * Use the index in the header to find the right starting point + */ + + hdr_index = pc / DUK_PC2LINE_SKIP; + pc_base = hdr_index * DUK_PC2LINE_SKIP; + n = pc - pc_base; + + if (DUK_HBUFFER_FIXED_GET_SIZE(buf) <= sizeof(duk_uint32_t)) { + DUK_DD(DUK_DDPRINT("pc2line lookup failed: buffer is smaller than minimal header")); + goto pc2line_error; + } + + hdr = (duk_uint32_t *) (void *) DUK_HBUFFER_FIXED_GET_DATA_PTR(thr->heap, buf); + pc_limit = hdr[0]; + if (pc >= pc_limit) { + /* Note: pc is unsigned and cannot be negative */ + DUK_DD(DUK_DDPRINT("pc2line lookup failed: pc out of bounds (pc=%ld, limit=%ld)", + (long) pc, (long) pc_limit)); + goto pc2line_error; + } + + curr_line = hdr[1 + hdr_index * 2]; + start_offset = hdr[1 + hdr_index * 2 + 1]; + if ((duk_size_t) start_offset > DUK_HBUFFER_FIXED_GET_SIZE(buf)) { + DUK_DD(DUK_DDPRINT("pc2line lookup failed: start_offset out of bounds (start_offset=%ld, buffer_size=%ld)", + (long) start_offset, (long) DUK_HBUFFER_GET_SIZE((duk_hbuffer *) buf))); + goto pc2line_error; + } + + /* + * Iterate the bitstream (line diffs) until PC is reached + */ + + duk_memzero(bd_ctx, sizeof(*bd_ctx)); + bd_ctx->data = ((duk_uint8_t *) hdr) + start_offset; + bd_ctx->length = (duk_size_t) (DUK_HBUFFER_FIXED_GET_SIZE(buf) - start_offset); + +#if 0 + DUK_DDD(DUK_DDDPRINT("pc2line lookup: pc=%ld -> hdr_index=%ld, pc_base=%ld, n=%ld, start_offset=%ld", + (long) pc, (long) hdr_index, (long) pc_base, (long) n, (long) start_offset)); +#endif + + while (n > 0) { +#if 0 + DUK_DDD(DUK_DDDPRINT("lookup: n=%ld, curr_line=%ld", (long) n, (long) curr_line)); +#endif + + if (duk_bd_decode_flag(bd_ctx)) { + if (duk_bd_decode_flag(bd_ctx)) { + if (duk_bd_decode_flag(bd_ctx)) { + /* 1 1 1 <32 bits> */ + duk_uint_fast32_t t; + t = duk_bd_decode(bd_ctx, 16); /* workaround: max nbits = 24 now */ + t = (t << 16) + duk_bd_decode(bd_ctx, 16); + curr_line = t; + } else { + /* 1 1 0 <8 bits> */ + duk_uint_fast32_t t; + t = duk_bd_decode(bd_ctx, 8); + curr_line = curr_line + t - 0x80; + } + } else { + /* 1 0 <2 bits> */ + duk_uint_fast32_t t; + t = duk_bd_decode(bd_ctx, 2); + curr_line = curr_line + t + 1; + } + } else { + /* 0: no change */ + } + + n--; + } + + DUK_DDD(DUK_DDDPRINT("pc2line lookup result: pc %ld -> line %ld", (long) pc, (long) curr_line)); + return curr_line; + + pc2line_error: + DUK_D(DUK_DPRINT("pc2line conversion failed for pc=%ld", (long) pc)); + return 0; +} + +DUK_INTERNAL duk_uint_fast32_t duk_hobject_pc2line_query(duk_hthread *thr, duk_idx_t idx_func, duk_uint_fast32_t pc) { + duk_hbuffer_fixed *pc2line; + duk_uint_fast32_t line; + + /* XXX: now that pc2line is used by the debugger quite heavily in + * checked execution, this should be optimized to avoid value stack + * and perhaps also implement some form of pc2line caching (see + * future work in debugger.rst). + */ + + duk_get_prop_stridx(thr, idx_func, DUK_STRIDX_INT_PC2LINE); + pc2line = (duk_hbuffer_fixed *) (void *) duk_get_hbuffer(thr, -1); + if (pc2line != NULL) { + DUK_ASSERT(!DUK_HBUFFER_HAS_DYNAMIC((duk_hbuffer *) pc2line) && !DUK_HBUFFER_HAS_EXTERNAL((duk_hbuffer *) pc2line)); + line = duk__hobject_pc2line_query_raw(thr, pc2line, (duk_uint_fast32_t) pc); + } else { + line = 0; + } + duk_pop(thr); + + return line; +} + +#endif /* DUK_USE_PC2LINE */ +#line 1 "duk_hobject_props.c" +/* + * duk_hobject property access functionality. + * + * This is very central functionality for size, performance, and compliance. + * It is also rather intricate; see hobject-algorithms.rst for discussion on + * the algorithms and memory-management.rst for discussion on refcounts and + * side effect issues. + * + * Notes: + * + * - It might be tempting to assert "refcount nonzero" for objects + * being operated on, but that's not always correct: objects with + * a zero refcount may be operated on by the refcount implementation + * (finalization) for instance. Hence, no refcount assertions are made. + * + * - Many operations (memory allocation, identifier operations, etc) + * may cause arbitrary side effects (e.g. through GC and finalization). + * These side effects may invalidate duk_tval pointers which point to + * areas subject to reallocation (like value stack). Heap objects + * themselves have stable pointers. Holding heap object pointers or + * duk_tval copies is not problematic with respect to side effects; + * care must be taken when holding and using argument duk_tval pointers. + * + * - If a finalizer is executed, it may operate on the the same object + * we're currently dealing with. For instance, the finalizer might + * delete a certain property which has already been looked up and + * confirmed to exist. Ideally finalizers would be disabled if GC + * happens during property access. At the moment property table realloc + * disables finalizers, and all DECREFs may cause arbitrary changes so + * handle DECREF carefully. + * + * - The order of operations for a DECREF matters. When DECREF is executed, + * the entire object graph must be consistent; note that a refzero may + * lead to a mark-and-sweep through a refcount finalizer. Use NORZ macros + * and an explicit DUK_REFZERO_CHECK_xxx() if achieving correct order is hard. + */ + +/* + * XXX: array indices are mostly typed as duk_uint32_t here; duk_uarridx_t + * might be more appropriate. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Local defines + */ + +#define DUK__NO_ARRAY_INDEX DUK_HSTRING_NO_ARRAY_INDEX + +/* Marker values for hash part. */ +#define DUK__HASH_UNUSED DUK_HOBJECT_HASHIDX_UNUSED +#define DUK__HASH_DELETED DUK_HOBJECT_HASHIDX_DELETED + +/* Valstack space that suffices for all local calls, excluding any recursion + * into ECMAScript or Duktape/C calls (Proxy, getters, etc). + */ +#define DUK__VALSTACK_SPACE 10 + +/* Valstack space allocated especially for proxy lookup which does a + * recursive property lookup. + */ +#define DUK__VALSTACK_PROXY_LOOKUP 20 + +/* + * Local prototypes + */ + +DUK_LOCAL_DECL duk_bool_t duk__check_arguments_map_for_get(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *temp_desc); +DUK_LOCAL_DECL void duk__check_arguments_map_for_put(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *temp_desc, duk_bool_t throw_flag); +DUK_LOCAL_DECL void duk__check_arguments_map_for_delete(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *temp_desc); + +DUK_LOCAL_DECL duk_bool_t duk__handle_put_array_length_smaller(duk_hthread *thr, duk_hobject *obj, duk_uint32_t old_len, duk_uint32_t new_len, duk_bool_t force_flag, duk_uint32_t *out_result_len); +DUK_LOCAL_DECL duk_bool_t duk__handle_put_array_length(duk_hthread *thr, duk_hobject *obj); + +DUK_LOCAL_DECL duk_bool_t duk__get_propdesc(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *out_desc, duk_small_uint_t flags); +DUK_LOCAL_DECL duk_bool_t duk__get_own_propdesc_raw(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_uint32_t arr_idx, duk_propdesc *out_desc, duk_small_uint_t flags); + +/* + * Misc helpers + */ + +/* Convert a duk_tval number (caller checks) to a 32-bit index. Returns + * DUK__NO_ARRAY_INDEX if the number is not whole or not a valid array + * index. + */ +/* XXX: for fastints, could use a variant which assumes a double duk_tval + * (and doesn't need to check for fastint again). + */ +DUK_LOCAL duk_uint32_t duk__tval_number_to_arr_idx(duk_tval *tv) { + duk_double_t dbl; + duk_uint32_t idx; + + DUK_ASSERT(tv != NULL); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + + /* -0 is accepted here as index 0 because ToString(-0) == "0" which is + * in canonical form and thus an array index. + */ + dbl = DUK_TVAL_GET_NUMBER(tv); + idx = (duk_uint32_t) dbl; + if ((duk_double_t) idx == dbl) { + /* Is whole and within 32 bit range. If the value happens to be 0xFFFFFFFF, + * it's not a valid array index but will then match DUK__NO_ARRAY_INDEX. + */ + return idx; + } + return DUK__NO_ARRAY_INDEX; +} + +#if defined(DUK_USE_FASTINT) +/* Convert a duk_tval fastint (caller checks) to a 32-bit index. */ +DUK_LOCAL duk_uint32_t duk__tval_fastint_to_arr_idx(duk_tval *tv) { + duk_int64_t t; + + DUK_ASSERT(tv != NULL); + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv)); + + t = DUK_TVAL_GET_FASTINT(tv); + if (((duk_uint64_t) t & ~DUK_U64_CONSTANT(0xffffffff)) != 0) { + /* Catches >0x100000000 and negative values. */ + return DUK__NO_ARRAY_INDEX; + } + + /* If the value happens to be 0xFFFFFFFF, it's not a valid array index + * but will then match DUK__NO_ARRAY_INDEX. + */ + return (duk_uint32_t) t; +} +#endif /* DUK_USE_FASTINT */ + +/* Convert a duk_tval on the value stack (in a trusted index we don't validate) + * to a string or symbol using ES2015 ToPropertyKey(): + * http://www.ecma-international.org/ecma-262/6.0/#sec-topropertykey. + * + * Also check if it's a valid array index and return that (or DUK__NO_ARRAY_INDEX + * if not). + */ +DUK_LOCAL duk_uint32_t duk__to_property_key(duk_hthread *thr, duk_idx_t idx, duk_hstring **out_h) { + duk_uint32_t arr_idx; + duk_hstring *h; + duk_tval *tv_dst; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(out_h != NULL); + DUK_ASSERT(duk_is_valid_index(thr, idx)); + DUK_ASSERT(idx < 0); + + /* XXX: The revised ES2015 ToPropertyKey() handling (ES5.1 was just + * ToString()) involves a ToPrimitive(), a symbol check, and finally + * a ToString(). Figure out the best way to have a good fast path + * but still be compliant and share code. + */ + + tv_dst = DUK_GET_TVAL_NEGIDX(thr, idx); /* intentionally unvalidated */ + if (DUK_TVAL_IS_STRING(tv_dst)) { + /* Most important path: strings and plain symbols are used as + * is. For symbols the array index check below is unnecessary + * (they're never valid array indices) but checking that the + * string is a symbol would make the plain string path slower + * unnecessarily. + */ + h = DUK_TVAL_GET_STRING(tv_dst); + } else { + h = duk_to_property_key_hstring(thr, idx); + } + DUK_ASSERT(h != NULL); + *out_h = h; + + arr_idx = DUK_HSTRING_GET_ARRIDX_FAST(h); + return arr_idx; +} + +DUK_LOCAL duk_uint32_t duk__push_tval_to_property_key(duk_hthread *thr, duk_tval *tv_key, duk_hstring **out_h) { + duk_push_tval(thr, tv_key); /* XXX: could use an unsafe push here */ + return duk__to_property_key(thr, -1, out_h); +} + +/* String is an own (virtual) property of a plain buffer. */ +DUK_LOCAL duk_bool_t duk__key_is_plain_buf_ownprop(duk_hthread *thr, duk_hbuffer *buf, duk_hstring *key, duk_uint32_t arr_idx) { + DUK_UNREF(thr); + + /* Virtual index properties. Checking explicitly for + * 'arr_idx != DUK__NO_ARRAY_INDEX' is not necessary + * because DUK__NO_ARRAY_INDEXi is always larger than + * maximum allowed buffer size. + */ + DUK_ASSERT(DUK__NO_ARRAY_INDEX >= DUK_HBUFFER_GET_SIZE(buf)); + if (arr_idx < DUK_HBUFFER_GET_SIZE(buf)) { + return 1; + } + + /* Other virtual properties. */ + return (key == DUK_HTHREAD_STRING_LENGTH(thr)); +} + +/* + * Helpers for managing property storage size + */ + +/* Get default hash part size for a certain entry part size. */ +#if defined(DUK_USE_HOBJECT_HASH_PART) +DUK_LOCAL duk_uint32_t duk__get_default_h_size(duk_uint32_t e_size) { + DUK_ASSERT(e_size <= DUK_HOBJECT_MAX_PROPERTIES); + + if (e_size >= DUK_USE_HOBJECT_HASH_PROP_LIMIT) { + duk_uint32_t res; + duk_uint32_t tmp; + + /* Hash size should be 2^N where N is chosen so that 2^N is + * larger than e_size. Extra shifting is used to ensure hash + * is relatively sparse. + */ + tmp = e_size; + res = 2; /* Result will be 2 ** (N + 1). */ + while (tmp >= 0x40) { + tmp >>= 6; + res <<= 6; + } + while (tmp != 0) { + tmp >>= 1; + res <<= 1; + } + DUK_ASSERT((DUK_HOBJECT_MAX_PROPERTIES << 2U) > DUK_HOBJECT_MAX_PROPERTIES); /* Won't wrap, even shifted by 2. */ + DUK_ASSERT(res > e_size); + return res; + } else { + return 0; + } +} +#endif /* USE_PROP_HASH_PART */ + +/* Get minimum entry part growth for a certain size. */ +DUK_LOCAL duk_uint32_t duk__get_min_grow_e(duk_uint32_t e_size) { + duk_uint32_t res; + + DUK_ASSERT(e_size <= DUK_HOBJECT_MAX_PROPERTIES); + + res = (e_size + DUK_USE_HOBJECT_ENTRY_MINGROW_ADD) / DUK_USE_HOBJECT_ENTRY_MINGROW_DIVISOR; + DUK_ASSERT(res >= 1); /* important for callers */ + return res; +} + +/* Get minimum array part growth for a certain size. */ +DUK_LOCAL duk_uint32_t duk__get_min_grow_a(duk_uint32_t a_size) { + duk_uint32_t res; + + DUK_ASSERT((duk_size_t) a_size <= DUK_HOBJECT_MAX_PROPERTIES); + + res = (a_size + DUK_USE_HOBJECT_ARRAY_MINGROW_ADD) / DUK_USE_HOBJECT_ARRAY_MINGROW_DIVISOR; + DUK_ASSERT(res >= 1); /* important for callers */ + return res; +} + +/* Count actually used entry part entries (non-NULL keys). */ +DUK_LOCAL duk_uint32_t duk__count_used_e_keys(duk_hthread *thr, duk_hobject *obj) { + duk_uint_fast32_t i; + duk_uint_fast32_t n = 0; + duk_hstring **e; + + DUK_ASSERT(obj != NULL); + DUK_UNREF(thr); + + e = DUK_HOBJECT_E_GET_KEY_BASE(thr->heap, obj); + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + if (*e++) { + n++; + } + } + return (duk_uint32_t) n; +} + +/* Count actually used array part entries and array minimum size. + * NOTE: 'out_min_size' can be computed much faster by starting from the + * end and breaking out early when finding first used entry, but this is + * not needed now. + */ +DUK_LOCAL void duk__compute_a_stats(duk_hthread *thr, duk_hobject *obj, duk_uint32_t *out_used, duk_uint32_t *out_min_size) { + duk_uint_fast32_t i; + duk_uint_fast32_t used = 0; + duk_uint_fast32_t highest_idx = (duk_uint_fast32_t) -1; /* see below */ + duk_tval *a; + + DUK_ASSERT(obj != NULL); + DUK_ASSERT(out_used != NULL); + DUK_ASSERT(out_min_size != NULL); + DUK_UNREF(thr); + + a = DUK_HOBJECT_A_GET_BASE(thr->heap, obj); + for (i = 0; i < DUK_HOBJECT_GET_ASIZE(obj); i++) { + duk_tval *tv = a++; + if (!DUK_TVAL_IS_UNUSED(tv)) { + used++; + highest_idx = i; + } + } + + /* Initial value for highest_idx is -1 coerced to unsigned. This + * is a bit odd, but (highest_idx + 1) will then wrap to 0 below + * for out_min_size as intended. + */ + + *out_used = (duk_uint32_t) used; + *out_min_size = (duk_uint32_t) (highest_idx + 1); /* 0 if no used entries */ +} + +/* Check array density and indicate whether or not the array part should be abandoned. */ +DUK_LOCAL duk_bool_t duk__abandon_array_density_check(duk_uint32_t a_used, duk_uint32_t a_size) { + /* + * Array abandon check; abandon if: + * + * new_used / new_size < limit + * new_used < limit * new_size || limit is 3 bits fixed point + * new_used < limit' / 8 * new_size || *8 + * 8*new_used < limit' * new_size || :8 + * new_used < limit' * (new_size / 8) + * + * Here, new_used = a_used, new_size = a_size. + * + * Note: some callers use approximate values for a_used and/or a_size + * (e.g. dropping a '+1' term). This doesn't affect the usefulness + * of the check, but may confuse debugging. + */ + + return (a_used < DUK_USE_HOBJECT_ARRAY_ABANDON_LIMIT * (a_size >> 3)); +} + +/* Fast check for extending array: check whether or not a slow density check is required. */ +DUK_LOCAL duk_bool_t duk__abandon_array_slow_check_required(duk_uint32_t arr_idx, duk_uint32_t old_size) { + /* + * In a fast check we assume old_size equals old_used (i.e., existing + * array is fully dense). + * + * Slow check if: + * + * (new_size - old_size) / old_size > limit + * new_size - old_size > limit * old_size + * new_size > (1 + limit) * old_size || limit' is 3 bits fixed point + * new_size > (1 + (limit' / 8)) * old_size || * 8 + * 8 * new_size > (8 + limit') * old_size || : 8 + * new_size > (8 + limit') * (old_size / 8) + * new_size > limit'' * (old_size / 8) || limit'' = 9 -> max 25% increase + * arr_idx + 1 > limit'' * (old_size / 8) + * + * This check doesn't work well for small values, so old_size is rounded + * up for the check (and the '+ 1' of arr_idx can be ignored in practice): + * + * arr_idx > limit'' * ((old_size + 7) / 8) + */ + + return (arr_idx > DUK_USE_HOBJECT_ARRAY_FAST_RESIZE_LIMIT * ((old_size + 7) >> 3)); +} + +/* + * Proxy helpers + */ + +#if defined(DUK_USE_ES6_PROXY) +DUK_INTERNAL duk_bool_t duk_hobject_proxy_check(duk_hobject *obj, duk_hobject **out_target, duk_hobject **out_handler) { + duk_hproxy *h_proxy; + + DUK_ASSERT(obj != NULL); + DUK_ASSERT(out_target != NULL); + DUK_ASSERT(out_handler != NULL); + + /* Caller doesn't need to check exotic proxy behavior (but does so for + * some fast paths). + */ + if (DUK_LIKELY(!DUK_HOBJECT_IS_PROXY(obj))) { + return 0; + } + h_proxy = (duk_hproxy *) obj; + DUK_ASSERT_HPROXY_VALID(h_proxy); + + DUK_ASSERT(h_proxy->handler != NULL); + DUK_ASSERT(h_proxy->target != NULL); + *out_handler = h_proxy->handler; + *out_target = h_proxy->target; + + return 1; +} +#endif /* DUK_USE_ES6_PROXY */ + +/* Get Proxy target object. If the argument is not a Proxy, return it as is. + * If a Proxy is revoked, an error is thrown. + */ +#if defined(DUK_USE_ES6_PROXY) +DUK_INTERNAL duk_hobject *duk_hobject_resolve_proxy_target(duk_hobject *obj) { + DUK_ASSERT(obj != NULL); + + /* Resolve Proxy targets until Proxy chain ends. No explicit check for + * a Proxy loop: user code cannot create such a loop (it would only be + * possible by editing duk_hproxy references directly). + */ + + while (DUK_HOBJECT_IS_PROXY(obj)) { + duk_hproxy *h_proxy; + + h_proxy = (duk_hproxy *) obj; + DUK_ASSERT_HPROXY_VALID(h_proxy); + obj = h_proxy->target; + DUK_ASSERT(obj != NULL); + } + + DUK_ASSERT(obj != NULL); + return obj; +} +#endif /* DUK_USE_ES6_PROXY */ + +#if defined(DUK_USE_ES6_PROXY) +DUK_LOCAL duk_bool_t duk__proxy_check_prop(duk_hthread *thr, duk_hobject *obj, duk_small_uint_t stridx_trap, duk_tval *tv_key, duk_hobject **out_target) { + duk_hobject *h_handler; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(tv_key != NULL); + DUK_ASSERT(out_target != NULL); + + if (!duk_hobject_proxy_check(obj, out_target, &h_handler)) { + return 0; + } + DUK_ASSERT(*out_target != NULL); + DUK_ASSERT(h_handler != NULL); + + /* XXX: At the moment Duktape accesses internal keys like _Finalizer using a + * normal property set/get which would allow a proxy handler to interfere with + * such behavior and to get access to internal key strings. This is not a problem + * as such because internal key strings can be created in other ways too (e.g. + * through buffers). The best fix is to change Duktape internal lookups to + * skip proxy behavior. Until that, internal property accesses bypass the + * proxy and are applied to the target (as if the handler did not exist). + * This has some side effects, see test-bi-proxy-internal-keys.js. + */ + + if (DUK_TVAL_IS_STRING(tv_key)) { + duk_hstring *h_key = (duk_hstring *) DUK_TVAL_GET_STRING(tv_key); + DUK_ASSERT(h_key != NULL); + if (DUK_HSTRING_HAS_HIDDEN(h_key)) { + /* Symbol accesses must go through proxy lookup in ES2015. + * Hidden symbols behave like Duktape 1.x internal keys + * and currently won't. + */ + DUK_DDD(DUK_DDDPRINT("hidden key, skip proxy handler and apply to target")); + return 0; + } + } + + /* The handler is looked up with a normal property lookup; it may be an + * accessor or the handler object itself may be a proxy object. If the + * handler is a proxy, we need to extend the valstack as we make a + * recursive proxy check without a function call in between (in fact + * there is no limit to the potential recursion here). + * + * (For sanity, proxy creation rejects another proxy object as either + * the handler or the target at the moment so recursive proxy cases + * are not realized now.) + */ + + /* XXX: C recursion limit if proxies are allowed as handler/target values */ + + duk_require_stack(thr, DUK__VALSTACK_PROXY_LOOKUP); + duk_push_hobject(thr, h_handler); + if (duk_get_prop_stridx_short(thr, -1, stridx_trap)) { + /* -> [ ... handler trap ] */ + duk_insert(thr, -2); /* -> [ ... trap handler ] */ + + /* stack prepped for func call: [ ... trap handler ] */ + return 1; + } else { + duk_pop_2_unsafe(thr); + return 0; + } +} +#endif /* DUK_USE_ES6_PROXY */ + +/* + * Reallocate property allocation, moving properties to the new allocation. + * + * Includes key compaction, rehashing, and can also optionally abandon + * the array part, 'migrating' array entries into the beginning of the + * new entry part. + * + * There is no support for in-place reallocation or just compacting keys + * without resizing the property allocation. This is intentional to keep + * code size minimal, but would be useful future work. + * + * The implementation is relatively straightforward, except for the array + * abandonment process. Array abandonment requires that new string keys + * are interned, which may trigger GC. All keys interned so far must be + * reachable for GC at all times and correctly refcounted for; valstack is + * used for that now. + * + * Also, a GC triggered during this reallocation process must not interfere + * with the object being resized. This is currently controlled by preventing + * finalizers (as they may affect ANY object) and object compaction in + * mark-and-sweep. It would suffice to protect only this particular object + * from compaction, however. DECREF refzero cascades are side effect free + * and OK. + * + * Note: because we need to potentially resize the valstack (as part + * of abandoning the array part), any tval pointers to the valstack + * will become invalid after this call. + */ + +DUK_INTERNAL void duk_hobject_realloc_props(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t new_e_size, + duk_uint32_t new_a_size, + duk_uint32_t new_h_size, + duk_bool_t abandon_array) { + duk_small_uint_t prev_ms_base_flags; + duk_uint32_t new_alloc_size; + duk_uint32_t new_e_size_adjusted; + duk_uint8_t *new_p; + duk_hstring **new_e_k; + duk_propvalue *new_e_pv; + duk_uint8_t *new_e_f; + duk_tval *new_a; + duk_uint32_t *new_h; + duk_uint32_t new_e_next; + duk_uint_fast32_t i; + duk_size_t array_copy_size; +#if defined(DUK_USE_ASSERTIONS) + duk_bool_t prev_error_not_allowed; +#endif + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(!abandon_array || new_a_size == 0); /* if abandon_array, new_a_size must be 0 */ + DUK_ASSERT(DUK_HOBJECT_GET_PROPS(thr->heap, obj) != NULL || (DUK_HOBJECT_GET_ESIZE(obj) == 0 && DUK_HOBJECT_GET_ASIZE(obj) == 0)); + DUK_ASSERT(new_h_size == 0 || new_h_size >= new_e_size); /* required to guarantee success of rehashing, + * intentionally use unadjusted new_e_size + */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_STATS_INC(thr->heap, stats_object_realloc_props); + + /* + * Pre resize assertions. + */ + +#if defined(DUK_USE_ASSERTIONS) + /* XXX: pre-checks (such as no duplicate keys) */ +#endif + + /* + * For property layout 1, tweak e_size to ensure that the whole entry + * part (key + val + flags) is a suitable multiple for alignment + * (platform specific). + * + * Property layout 2 does not require this tweaking and is preferred + * on low RAM platforms requiring alignment. + */ + +#if defined(DUK_USE_HOBJECT_LAYOUT_2) || defined(DUK_USE_HOBJECT_LAYOUT_3) + DUK_DDD(DUK_DDDPRINT("using layout 2 or 3, no need to pad e_size: %ld", (long) new_e_size)); + new_e_size_adjusted = new_e_size; +#elif defined(DUK_USE_HOBJECT_LAYOUT_1) && (DUK_HOBJECT_ALIGN_TARGET == 1) + DUK_DDD(DUK_DDDPRINT("using layout 1, but no need to pad e_size: %ld", (long) new_e_size)); + new_e_size_adjusted = new_e_size; +#elif defined(DUK_USE_HOBJECT_LAYOUT_1) && ((DUK_HOBJECT_ALIGN_TARGET == 4) || (DUK_HOBJECT_ALIGN_TARGET == 8)) + new_e_size_adjusted = (new_e_size + (duk_uint32_t) DUK_HOBJECT_ALIGN_TARGET - 1U) & + (~((duk_uint32_t) DUK_HOBJECT_ALIGN_TARGET - 1U)); + DUK_DDD(DUK_DDDPRINT("using layout 1, and alignment target is %ld, adjusted e_size: %ld -> %ld", + (long) DUK_HOBJECT_ALIGN_TARGET, (long) new_e_size, (long) new_e_size_adjusted)); + DUK_ASSERT(new_e_size_adjusted >= new_e_size); +#else +#error invalid hobject layout defines +#endif + + /* + * Debug logging after adjustment. + */ + + DUK_DDD(DUK_DDDPRINT("attempt to resize hobject %p props (%ld -> %ld bytes), from {p=%p,e_size=%ld,e_next=%ld,a_size=%ld,h_size=%ld} to " + "{e_size=%ld,a_size=%ld,h_size=%ld}, abandon_array=%ld, unadjusted new_e_size=%ld", + (void *) obj, + (long) DUK_HOBJECT_P_COMPUTE_SIZE(DUK_HOBJECT_GET_ESIZE(obj), + DUK_HOBJECT_GET_ASIZE(obj), + DUK_HOBJECT_GET_HSIZE(obj)), + (long) DUK_HOBJECT_P_COMPUTE_SIZE(new_e_size_adjusted, new_a_size, new_h_size), + (void *) DUK_HOBJECT_GET_PROPS(thr->heap, obj), + (long) DUK_HOBJECT_GET_ESIZE(obj), + (long) DUK_HOBJECT_GET_ENEXT(obj), + (long) DUK_HOBJECT_GET_ASIZE(obj), + (long) DUK_HOBJECT_GET_HSIZE(obj), + (long) new_e_size_adjusted, + (long) new_a_size, + (long) new_h_size, + (long) abandon_array, + (long) new_e_size)); + + /* + * Property count check. This is the only point where we ensure that + * we don't get more (allocated) property space that we can handle. + * There aren't hard limits as such, but some algorithms may fail + * if we get too close to the 4G property limit. + * + * Since this works based on allocation size (not actually used size), + * the limit is a bit approximate but good enough in practice. + */ + + if (new_e_size_adjusted + new_a_size > DUK_HOBJECT_MAX_PROPERTIES) { + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return;); + } + + /* + * Compute new alloc size and alloc new area. + * + * The new area is not tracked in the heap at all, so it's critical + * we get to free/keep it in a controlled manner. + */ + +#if defined(DUK_USE_ASSERTIONS) + /* Whole path must be error throw free, but we may be called from + * within error handling so can't assert for error_not_allowed == 0. + */ + prev_error_not_allowed = thr->heap->error_not_allowed; + thr->heap->error_not_allowed = 1; +#endif + prev_ms_base_flags = thr->heap->ms_base_flags; + thr->heap->ms_base_flags |= + DUK_MS_FLAG_NO_OBJECT_COMPACTION; /* Avoid attempt to compact the current object (all objects really). */ + thr->heap->pf_prevent_count++; /* Avoid finalizers. */ + DUK_ASSERT(thr->heap->pf_prevent_count != 0); /* Wrap. */ + + new_alloc_size = DUK_HOBJECT_P_COMPUTE_SIZE(new_e_size_adjusted, new_a_size, new_h_size); + DUK_DDD(DUK_DDDPRINT("new hobject allocation size is %ld", (long) new_alloc_size)); + if (new_alloc_size == 0) { + DUK_ASSERT(new_e_size_adjusted == 0); + DUK_ASSERT(new_a_size == 0); + DUK_ASSERT(new_h_size == 0); + new_p = NULL; + } else { + /* Alloc may trigger mark-and-sweep but no compaction, and + * cannot throw. + */ +#if 0 /* XXX: inject test */ + if (1) { + new_p = NULL; + goto alloc_failed; + } +#endif + new_p = (duk_uint8_t *) DUK_ALLOC(thr->heap, new_alloc_size); + if (new_p == NULL) { + /* NULL always indicates alloc failure because + * new_alloc_size > 0. + */ + goto alloc_failed; + } + } + + /* Set up pointers to the new property area: this is hidden behind a macro + * because it is memory layout specific. + */ + DUK_HOBJECT_P_SET_REALLOC_PTRS(new_p, new_e_k, new_e_pv, new_e_f, new_a, new_h, + new_e_size_adjusted, new_a_size, new_h_size); + DUK_UNREF(new_h); /* happens when hash part dropped */ + new_e_next = 0; + + /* if new_p == NULL, all of these pointers are NULL */ + DUK_ASSERT((new_p != NULL) || + (new_e_k == NULL && new_e_pv == NULL && new_e_f == NULL && + new_a == NULL && new_h == NULL)); + + DUK_DDD(DUK_DDDPRINT("new alloc size %ld, new_e_k=%p, new_e_pv=%p, new_e_f=%p, new_a=%p, new_h=%p", + (long) new_alloc_size, (void *) new_e_k, (void *) new_e_pv, (void *) new_e_f, + (void *) new_a, (void *) new_h)); + + /* + * Migrate array part to start of entries if requested. + * + * Note: from an enumeration perspective the order of entry keys matters. + * Array keys should appear wherever they appeared before the array abandon + * operation. (This no longer matters much because keys are ES2015 sorted.) + */ + + if (abandon_array) { + /* Assuming new_a_size == 0, and that entry part contains + * no conflicting keys, refcounts do not need to be adjusted for + * the values, as they remain exactly the same. + * + * The keys, however, need to be interned, incref'd, and be + * reachable for GC. Any intern attempt may trigger a GC and + * claim any non-reachable strings, so every key must be reachable + * at all times. Refcounts must be correct to satisfy refcount + * assertions. + * + * A longjmp must not occur here, as the new_p allocation would + * leak. Refcounts would come out correctly as the interned + * strings are valstack tracked. + */ + DUK_ASSERT(new_a_size == 0); + + DUK_STATS_INC(thr->heap, stats_object_abandon_array); + + for (i = 0; i < DUK_HOBJECT_GET_ASIZE(obj); i++) { + duk_tval *tv1; + duk_tval *tv2; + duk_hstring *key; + + DUK_ASSERT(DUK_HOBJECT_GET_PROPS(thr->heap, obj) != NULL); + + tv1 = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, i); + if (DUK_TVAL_IS_UNUSED(tv1)) { + continue; + } + + DUK_ASSERT(new_p != NULL && new_e_k != NULL && + new_e_pv != NULL && new_e_f != NULL); + + /* + * Intern key via the valstack to ensure reachability behaves + * properly. We must avoid longjmp's here so use non-checked + * primitives. + * + * Note: duk_check_stack() potentially reallocs the valstack, + * invalidating any duk_tval pointers to valstack. Callers + * must be careful. + */ + +#if 0 /* XXX: inject test */ + if (1) { + goto abandon_error; + } +#endif + /* Never shrinks; auto-adds DUK_VALSTACK_INTERNAL_EXTRA, which + * is generous. + */ + if (!duk_check_stack(thr, 1)) { + goto abandon_error; + } + DUK_ASSERT_VALSTACK_SPACE(thr, 1); + key = duk_heap_strtable_intern_u32(thr->heap, (duk_uint32_t) i); + if (key == NULL) { + goto abandon_error; + } + duk_push_hstring(thr, key); /* keep key reachable for GC etc; guaranteed not to fail */ + + /* Key is now reachable in the valstack, don't INCREF + * the new allocation yet (we'll steal the refcounts + * from the value stack once all keys are done). + */ + + new_e_k[new_e_next] = key; + tv2 = &new_e_pv[new_e_next].v; /* array entries are all plain values */ + DUK_TVAL_SET_TVAL(tv2, tv1); + new_e_f[new_e_next] = DUK_PROPDESC_FLAG_WRITABLE | + DUK_PROPDESC_FLAG_ENUMERABLE | + DUK_PROPDESC_FLAG_CONFIGURABLE; + new_e_next++; + + /* Note: new_e_next matches pushed temp key count, and nothing can + * fail above between the push and this point. + */ + } + + /* Steal refcounts from value stack. */ + DUK_DDD(DUK_DDDPRINT("abandon array: pop %ld key temps from valstack", (long) new_e_next)); + duk_pop_n_nodecref_unsafe(thr, (duk_idx_t) new_e_next); + } + + /* + * Copy keys and values in the entry part (compacting them at the same time). + */ + + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + duk_hstring *key; + + DUK_ASSERT(DUK_HOBJECT_GET_PROPS(thr->heap, obj) != NULL); + + key = DUK_HOBJECT_E_GET_KEY(thr->heap, obj, i); + if (key == NULL) { + continue; + } + + DUK_ASSERT(new_p != NULL && new_e_k != NULL && + new_e_pv != NULL && new_e_f != NULL); + + new_e_k[new_e_next] = key; + new_e_pv[new_e_next] = DUK_HOBJECT_E_GET_VALUE(thr->heap, obj, i); + new_e_f[new_e_next] = DUK_HOBJECT_E_GET_FLAGS(thr->heap, obj, i); + new_e_next++; + } + /* the entries [new_e_next, new_e_size_adjusted[ are left uninitialized on purpose (ok, not gc reachable) */ + + /* + * Copy array elements to new array part. If the new array part is + * larger, initialize the unused entries as UNUSED because they are + * GC reachable. + */ + +#if defined(DUK_USE_ASSERTIONS) + /* Caller must have decref'd values above new_a_size (if that is necessary). */ + if (!abandon_array) { + for (i = new_a_size; i < DUK_HOBJECT_GET_ASIZE(obj); i++) { + duk_tval *tv; + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, i); + DUK_ASSERT(DUK_TVAL_IS_UNUSED(tv)); + } + } +#endif + if (new_a_size > DUK_HOBJECT_GET_ASIZE(obj)) { + array_copy_size = sizeof(duk_tval) * DUK_HOBJECT_GET_ASIZE(obj); + } else { + array_copy_size = sizeof(duk_tval) * new_a_size; + } + + DUK_ASSERT(new_a != NULL || array_copy_size == 0U); + DUK_ASSERT(DUK_HOBJECT_GET_PROPS(thr->heap, obj) != NULL || array_copy_size == 0U); + DUK_ASSERT(DUK_HOBJECT_GET_ASIZE(obj) > 0 || array_copy_size == 0U); + duk_memcpy_unsafe((void *) new_a, + (const void *) DUK_HOBJECT_A_GET_BASE(thr->heap, obj), + array_copy_size); + + for (i = DUK_HOBJECT_GET_ASIZE(obj); i < new_a_size; i++) { + duk_tval *tv = &new_a[i]; + DUK_TVAL_SET_UNUSED(tv); + } + + /* + * Rebuild the hash part always from scratch (guaranteed to finish + * as long as caller gave consistent parameters). + * + * Any resize of hash part requires rehashing. In addition, by rehashing + * get rid of any elements marked deleted (DUK__HASH_DELETED) which is critical + * to ensuring the hash part never fills up. + */ + +#if defined(DUK_USE_HOBJECT_HASH_PART) + if (new_h_size == 0) { + DUK_DDD(DUK_DDDPRINT("no hash part, no rehash")); + } else { + duk_uint32_t mask; + + DUK_ASSERT(new_h != NULL); + + /* fill new_h with u32 0xff = UNUSED */ + DUK_ASSERT(new_h_size > 0); + duk_memset(new_h, 0xff, sizeof(duk_uint32_t) * new_h_size); + + DUK_ASSERT(new_e_next <= new_h_size); /* equality not actually possible */ + + mask = new_h_size - 1; + for (i = 0; i < new_e_next; i++) { + duk_hstring *key = new_e_k[i]; + duk_uint32_t j, step; + + DUK_ASSERT(key != NULL); + j = DUK_HSTRING_GET_HASH(key) & mask; + step = 1; /* Cache friendly but clustering prone. */ + + for (;;) { + DUK_ASSERT(new_h[j] != DUK__HASH_DELETED); /* should never happen */ + if (new_h[j] == DUK__HASH_UNUSED) { + DUK_DDD(DUK_DDDPRINT("rebuild hit %ld -> %ld", (long) j, (long) i)); + new_h[j] = (duk_uint32_t) i; + break; + } + DUK_DDD(DUK_DDDPRINT("rebuild miss %ld, step %ld", (long) j, (long) step)); + j = (j + step) & mask; + + /* Guaranteed to finish (hash is larger than #props). */ + } + } + } +#endif /* DUK_USE_HOBJECT_HASH_PART */ + + /* + * Nice debug log. + */ + + DUK_DD(DUK_DDPRINT("resized hobject %p props (%ld -> %ld bytes), from {p=%p,e_size=%ld,e_next=%ld,a_size=%ld,h_size=%ld} to " + "{p=%p,e_size=%ld,e_next=%ld,a_size=%ld,h_size=%ld}, abandon_array=%ld, unadjusted new_e_size=%ld", + (void *) obj, + (long) DUK_HOBJECT_P_COMPUTE_SIZE(DUK_HOBJECT_GET_ESIZE(obj), + DUK_HOBJECT_GET_ASIZE(obj), + DUK_HOBJECT_GET_HSIZE(obj)), + (long) new_alloc_size, + (void *) DUK_HOBJECT_GET_PROPS(thr->heap, obj), + (long) DUK_HOBJECT_GET_ESIZE(obj), + (long) DUK_HOBJECT_GET_ENEXT(obj), + (long) DUK_HOBJECT_GET_ASIZE(obj), + (long) DUK_HOBJECT_GET_HSIZE(obj), + (void *) new_p, + (long) new_e_size_adjusted, + (long) new_e_next, + (long) new_a_size, + (long) new_h_size, + (long) abandon_array, + (long) new_e_size)); + + /* + * All done, switch properties ('p') allocation to new one. + */ + + DUK_FREE_CHECKED(thr, DUK_HOBJECT_GET_PROPS(thr->heap, obj)); /* NULL obj->p is OK */ + DUK_HOBJECT_SET_PROPS(thr->heap, obj, new_p); + DUK_HOBJECT_SET_ESIZE(obj, new_e_size_adjusted); + DUK_HOBJECT_SET_ENEXT(obj, new_e_next); + DUK_HOBJECT_SET_ASIZE(obj, new_a_size); + DUK_HOBJECT_SET_HSIZE(obj, new_h_size); + + /* Clear array part flag only after switching. */ + if (abandon_array) { + DUK_HOBJECT_CLEAR_ARRAY_PART(obj); + } + + DUK_DDD(DUK_DDDPRINT("resize result: %!O", (duk_heaphdr *) obj)); + + DUK_ASSERT(thr->heap->pf_prevent_count > 0); + thr->heap->pf_prevent_count--; + thr->heap->ms_base_flags = prev_ms_base_flags; +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(thr->heap->error_not_allowed == 1); + thr->heap->error_not_allowed = prev_error_not_allowed; +#endif + + /* + * Post resize assertions. + */ + +#if defined(DUK_USE_ASSERTIONS) + /* XXX: post-checks (such as no duplicate keys) */ +#endif + return; + + /* + * Abandon array failed. We don't need to DECREF anything + * because the references in the new allocation are not + * INCREF'd until abandon is complete. The string interned + * keys are on the value stack and are handled normally by + * unwind. + */ + + abandon_error: + alloc_failed: + DUK_D(DUK_DPRINT("object property table resize failed")); + + DUK_FREE_CHECKED(thr, new_p); /* OK for NULL. */ + + thr->heap->pf_prevent_count--; + thr->heap->ms_base_flags = prev_ms_base_flags; +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(thr->heap->error_not_allowed == 1); + thr->heap->error_not_allowed = prev_error_not_allowed; +#endif + + DUK_ERROR_ALLOC_FAILED(thr); + DUK_WO_NORETURN(return;); +} + +/* + * Helpers to resize properties allocation on specific needs. + */ + +DUK_INTERNAL void duk_hobject_resize_entrypart(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t new_e_size) { + duk_uint32_t old_e_size; + duk_uint32_t new_a_size; + duk_uint32_t new_h_size; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + + old_e_size = DUK_HOBJECT_GET_ESIZE(obj); + if (old_e_size > new_e_size) { + new_e_size = old_e_size; + } +#if defined(DUK_USE_HOBJECT_HASH_PART) + new_h_size = duk__get_default_h_size(new_e_size); +#else + new_h_size = 0; +#endif + new_a_size = DUK_HOBJECT_GET_ASIZE(obj); + + duk_hobject_realloc_props(thr, obj, new_e_size, new_a_size, new_h_size, 0); +} + +#if 0 /*unused */ +DUK_INTERNAL void duk_hobject_resize_arraypart(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t new_a_size) { + duk_uint32_t old_a_size; + duk_uint32_t new_e_size; + duk_uint32_t new_h_size; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + + if (!DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + return; + } + old_a_size = DUK_HOBJECT_GET_ASIZE(obj); + if (old_a_size > new_a_size) { + new_a_size = old_a_size; + } + new_e_size = DUK_HOBJECT_GET_ESIZE(obj); + new_h_size = DUK_HOBJECT_GET_HSIZE(obj); + + duk_hobject_realloc_props(thr, obj, new_e_size, new_a_size, new_h_size, 0); +} +#endif + +/* Grow entry part allocation for one additional entry. */ +DUK_LOCAL void duk__grow_props_for_new_entry_item(duk_hthread *thr, duk_hobject *obj) { + duk_uint32_t old_e_used; /* actually used, non-NULL entries */ + duk_uint32_t new_e_size; + duk_uint32_t new_a_size; + duk_uint32_t new_h_size; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + + /* Duktape 0.11.0 and prior tried to optimize the resize by not + * counting the number of actually used keys prior to the resize. + * This worked mostly well but also caused weird leak-like behavior + * as in: test-bug-object-prop-alloc-unbounded.js. So, now we count + * the keys explicitly to compute the new entry part size. + */ + + old_e_used = duk__count_used_e_keys(thr, obj); + new_e_size = old_e_used + duk__get_min_grow_e(old_e_used); +#if defined(DUK_USE_HOBJECT_HASH_PART) + new_h_size = duk__get_default_h_size(new_e_size); +#else + new_h_size = 0; +#endif + new_a_size = DUK_HOBJECT_GET_ASIZE(obj); + DUK_ASSERT(new_e_size >= old_e_used + 1); /* duk__get_min_grow_e() is always >= 1 */ + + duk_hobject_realloc_props(thr, obj, new_e_size, new_a_size, new_h_size, 0); +} + +/* Grow array part for a new highest array index. */ +DUK_LOCAL void duk__grow_props_for_array_item(duk_hthread *thr, duk_hobject *obj, duk_uint32_t highest_arr_idx) { + duk_uint32_t new_e_size; + duk_uint32_t new_a_size; + duk_uint32_t new_h_size; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(highest_arr_idx >= DUK_HOBJECT_GET_ASIZE(obj)); + + /* minimum new length is highest_arr_idx + 1 */ + + new_e_size = DUK_HOBJECT_GET_ESIZE(obj); + new_h_size = DUK_HOBJECT_GET_HSIZE(obj); + new_a_size = highest_arr_idx + duk__get_min_grow_a(highest_arr_idx); + DUK_ASSERT(new_a_size >= highest_arr_idx + 1); /* duk__get_min_grow_a() is always >= 1 */ + + duk_hobject_realloc_props(thr, obj, new_e_size, new_a_size, new_h_size, 0); +} + +/* Abandon array part, moving array entries into entries part. + * This requires a props resize, which is a heavy operation. + * We also compact the entries part while we're at it, although + * this is not strictly required. + */ +DUK_LOCAL void duk__abandon_array_checked(duk_hthread *thr, duk_hobject *obj) { + duk_uint32_t new_e_size; + duk_uint32_t new_a_size; + duk_uint32_t new_h_size; + duk_uint32_t e_used; /* actually used, non-NULL keys */ + duk_uint32_t a_used; + duk_uint32_t a_size; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + + e_used = duk__count_used_e_keys(thr, obj); + duk__compute_a_stats(thr, obj, &a_used, &a_size); + + /* + * Must guarantee all actually used array entries will fit into + * new entry part. Add one growth step to ensure we don't run out + * of space right away. + */ + + new_e_size = e_used + a_used; + new_e_size = new_e_size + duk__get_min_grow_e(new_e_size); + new_a_size = 0; +#if defined(DUK_USE_HOBJECT_HASH_PART) + new_h_size = duk__get_default_h_size(new_e_size); +#else + new_h_size = 0; +#endif + + DUK_DD(DUK_DDPRINT("abandon array part for hobject %p, " + "array stats before: e_used=%ld, a_used=%ld, a_size=%ld; " + "resize to e_size=%ld, a_size=%ld, h_size=%ld", + (void *) obj, (long) e_used, (long) a_used, (long) a_size, + (long) new_e_size, (long) new_a_size, (long) new_h_size)); + + duk_hobject_realloc_props(thr, obj, new_e_size, new_a_size, new_h_size, 1); +} + +/* + * Compact an object. Minimizes allocation size for objects which are + * not likely to be extended. This is useful for internal and non- + * extensible objects, but can also be called for non-extensible objects. + * May abandon the array part if it is computed to be too sparse. + * + * This call is relatively expensive, as it needs to scan both the + * entries and the array part. + * + * The call may fail due to allocation error. + */ + +DUK_INTERNAL void duk_hobject_compact_props(duk_hthread *thr, duk_hobject *obj) { + duk_uint32_t e_size; /* currently used -> new size */ + duk_uint32_t a_size; /* currently required */ + duk_uint32_t a_used; /* actually used */ + duk_uint32_t h_size; + duk_bool_t abandon_array; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + +#if defined(DUK_USE_ROM_OBJECTS) + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) { + DUK_DD(DUK_DDPRINT("ignore attempt to compact a rom object")); + return; + } +#endif + + e_size = duk__count_used_e_keys(thr, obj); + duk__compute_a_stats(thr, obj, &a_used, &a_size); + + DUK_DD(DUK_DDPRINT("compacting hobject, used e keys %ld, used a keys %ld, min a size %ld, " + "resized array density would be: %ld/%ld = %lf", + (long) e_size, (long) a_used, (long) a_size, + (long) a_used, (long) a_size, + (double) a_used / (double) a_size)); + + if (duk__abandon_array_density_check(a_used, a_size)) { + DUK_DD(DUK_DDPRINT("decided to abandon array during compaction, a_used=%ld, a_size=%ld", + (long) a_used, (long) a_size)); + abandon_array = 1; + e_size += a_used; + a_size = 0; + } else { + DUK_DD(DUK_DDPRINT("decided to keep array during compaction")); + abandon_array = 0; + } + +#if defined(DUK_USE_HOBJECT_HASH_PART) + if (e_size >= DUK_USE_HOBJECT_HASH_PROP_LIMIT) { + h_size = duk__get_default_h_size(e_size); + } else { + h_size = 0; + } +#else + h_size = 0; +#endif + + DUK_DD(DUK_DDPRINT("compacting hobject -> new e_size %ld, new a_size=%ld, new h_size=%ld, abandon_array=%ld", + (long) e_size, (long) a_size, (long) h_size, (long) abandon_array)); + + duk_hobject_realloc_props(thr, obj, e_size, a_size, h_size, abandon_array); +} + +/* + * Find an existing key from entry part either by linear scan or by + * using the hash index (if it exists). + * + * Sets entry index (and possibly the hash index) to output variables, + * which allows the caller to update the entry and hash entries in-place. + * If entry is not found, both values are set to -1. If entry is found + * but there is no hash part, h_idx is set to -1. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_find_existing_entry(duk_heap *heap, duk_hobject *obj, duk_hstring *key, duk_int_t *e_idx, duk_int_t *h_idx) { + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(e_idx != NULL); + DUK_ASSERT(h_idx != NULL); + DUK_UNREF(heap); + + if (DUK_LIKELY(DUK_HOBJECT_GET_HSIZE(obj) == 0)) + { + /* Linear scan: more likely because most objects are small. + * This is an important fast path. + * + * XXX: this might be worth inlining for property lookups. + */ + duk_uint_fast32_t i; + duk_uint_fast32_t n; + duk_hstring **h_keys_base; + DUK_DDD(DUK_DDDPRINT("duk_hobject_find_existing_entry() using linear scan for lookup")); + + h_keys_base = DUK_HOBJECT_E_GET_KEY_BASE(heap, obj); + n = DUK_HOBJECT_GET_ENEXT(obj); + for (i = 0; i < n; i++) { + if (h_keys_base[i] == key) { + *e_idx = (duk_int_t) i; + *h_idx = -1; + return 1; + } + } + } +#if defined(DUK_USE_HOBJECT_HASH_PART) + else + { + /* hash lookup */ + duk_uint32_t n; + duk_uint32_t i, step; + duk_uint32_t *h_base; + duk_uint32_t mask; + + DUK_DDD(DUK_DDDPRINT("duk_hobject_find_existing_entry() using hash part for lookup")); + + h_base = DUK_HOBJECT_H_GET_BASE(heap, obj); + n = DUK_HOBJECT_GET_HSIZE(obj); + mask = n - 1; + i = DUK_HSTRING_GET_HASH(key) & mask; + step = 1; /* Cache friendly but clustering prone. */ + + for (;;) { + duk_uint32_t t; + + DUK_ASSERT_DISABLE(i >= 0); /* unsigned */ + DUK_ASSERT(i < DUK_HOBJECT_GET_HSIZE(obj)); + t = h_base[i]; + DUK_ASSERT(t == DUK__HASH_UNUSED || t == DUK__HASH_DELETED || + (t < DUK_HOBJECT_GET_ESIZE(obj))); /* t >= 0 always true, unsigned */ + + if (t == DUK__HASH_UNUSED) { + break; + } else if (t == DUK__HASH_DELETED) { + DUK_DDD(DUK_DDDPRINT("lookup miss (deleted) i=%ld, t=%ld", + (long) i, (long) t)); + } else { + DUK_ASSERT(t < DUK_HOBJECT_GET_ESIZE(obj)); + if (DUK_HOBJECT_E_GET_KEY(heap, obj, t) == key) { + DUK_DDD(DUK_DDDPRINT("lookup hit i=%ld, t=%ld -> key %p", + (long) i, (long) t, (void *) key)); + *e_idx = (duk_int_t) t; + *h_idx = (duk_int_t) i; + return 1; + } + DUK_DDD(DUK_DDDPRINT("lookup miss i=%ld, t=%ld", + (long) i, (long) t)); + } + i = (i + step) & mask; + + /* Guaranteed to finish (hash is larger than #props). */ + } + } +#endif /* DUK_USE_HOBJECT_HASH_PART */ + + /* Not found, leave e_idx and h_idx unset. */ + return 0; +} + +/* For internal use: get non-accessor entry value */ +DUK_INTERNAL duk_tval *duk_hobject_find_existing_entry_tval_ptr(duk_heap *heap, duk_hobject *obj, duk_hstring *key) { + duk_int_t e_idx; + duk_int_t h_idx; + + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_UNREF(heap); + + if (duk_hobject_find_existing_entry(heap, obj, key, &e_idx, &h_idx)) { + DUK_ASSERT(e_idx >= 0); + if (!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap, obj, e_idx)) { + return DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(heap, obj, e_idx); + } + } + return NULL; +} + +/* For internal use: get non-accessor entry value and attributes */ +DUK_INTERNAL duk_tval *duk_hobject_find_existing_entry_tval_ptr_and_attrs(duk_heap *heap, duk_hobject *obj, duk_hstring *key, duk_uint_t *out_attrs) { + duk_int_t e_idx; + duk_int_t h_idx; + + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(out_attrs != NULL); + DUK_UNREF(heap); + + if (duk_hobject_find_existing_entry(heap, obj, key, &e_idx, &h_idx)) { + DUK_ASSERT(e_idx >= 0); + if (!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap, obj, e_idx)) { + *out_attrs = DUK_HOBJECT_E_GET_FLAGS(heap, obj, e_idx); + return DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(heap, obj, e_idx); + } + } + /* If not found, out_attrs is left unset. */ + return NULL; +} + +/* For internal use: get array part value */ +DUK_INTERNAL duk_tval *duk_hobject_find_existing_array_entry_tval_ptr(duk_heap *heap, duk_hobject *obj, duk_uarridx_t i) { + duk_tval *tv; + + DUK_ASSERT(obj != NULL); + DUK_UNREF(heap); + + if (!DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + return NULL; + } + if (i >= DUK_HOBJECT_GET_ASIZE(obj)) { + return NULL; + } + tv = DUK_HOBJECT_A_GET_VALUE_PTR(heap, obj, i); + return tv; +} + +/* + * Allocate and initialize a new entry, resizing the properties allocation + * if necessary. Returns entry index (e_idx) or throws an error if alloc fails. + * + * Sets the key of the entry (increasing the key's refcount), and updates + * the hash part if it exists. Caller must set value and flags, and update + * the entry value refcount. A decref for the previous value is not necessary. + */ + +DUK_LOCAL duk_int_t duk__hobject_alloc_entry_checked(duk_hthread *thr, duk_hobject *obj, duk_hstring *key) { + duk_uint32_t idx; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_ENEXT(obj) <= DUK_HOBJECT_GET_ESIZE(obj)); + +#if defined(DUK_USE_ASSERTIONS) + /* key must not already exist in entry part */ + { + duk_uint_fast32_t i; + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + DUK_ASSERT(DUK_HOBJECT_E_GET_KEY(thr->heap, obj, i) != key); + } + } +#endif + + if (DUK_HOBJECT_GET_ENEXT(obj) >= DUK_HOBJECT_GET_ESIZE(obj)) { + /* only need to guarantee 1 more slot, but allocation growth is in chunks */ + DUK_DDD(DUK_DDDPRINT("entry part full, allocate space for one more entry")); + duk__grow_props_for_new_entry_item(thr, obj); + } + DUK_ASSERT(DUK_HOBJECT_GET_ENEXT(obj) < DUK_HOBJECT_GET_ESIZE(obj)); + idx = DUK_HOBJECT_POSTINC_ENEXT(obj); + + /* previous value is assumed to be garbage, so don't touch it */ + DUK_HOBJECT_E_SET_KEY(thr->heap, obj, idx, key); + DUK_HSTRING_INCREF(thr, key); + +#if defined(DUK_USE_HOBJECT_HASH_PART) + if (DUK_UNLIKELY(DUK_HOBJECT_GET_HSIZE(obj) > 0)) { + duk_uint32_t n, mask; + duk_uint32_t i, step; + duk_uint32_t *h_base = DUK_HOBJECT_H_GET_BASE(thr->heap, obj); + + n = DUK_HOBJECT_GET_HSIZE(obj); + mask = n - 1; + i = DUK_HSTRING_GET_HASH(key) & mask; + step = 1; /* Cache friendly but clustering prone. */ + + for (;;) { + duk_uint32_t t = h_base[i]; + if (t == DUK__HASH_UNUSED || t == DUK__HASH_DELETED) { + DUK_DDD(DUK_DDDPRINT("duk__hobject_alloc_entry_checked() inserted key into hash part, %ld -> %ld", + (long) i, (long) idx)); + DUK_ASSERT_DISABLE(i >= 0); /* unsigned */ + DUK_ASSERT(i < DUK_HOBJECT_GET_HSIZE(obj)); + DUK_ASSERT_DISABLE(idx >= 0); + DUK_ASSERT(idx < DUK_HOBJECT_GET_ESIZE(obj)); + h_base[i] = idx; + break; + } + DUK_DDD(DUK_DDDPRINT("duk__hobject_alloc_entry_checked() miss %ld", (long) i)); + i = (i + step) & mask; + + /* Guaranteed to finish (hash is larger than #props). */ + } + } +#endif /* DUK_USE_HOBJECT_HASH_PART */ + + /* Note: we could return the hash index here too, but it's not + * needed right now. + */ + + DUK_ASSERT_DISABLE(idx >= 0); + DUK_ASSERT(idx < DUK_HOBJECT_GET_ESIZE(obj)); + DUK_ASSERT(idx < DUK_HOBJECT_GET_ENEXT(obj)); + return (duk_int_t) idx; +} + +/* + * Object internal value + * + * Returned value is guaranteed to be reachable / incref'd, caller does not need + * to incref OR decref. No proxies or accessors are invoked, no prototype walk. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_get_internal_value(duk_heap *heap, duk_hobject *obj, duk_tval *tv_out) { + duk_int_t e_idx; + duk_int_t h_idx; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(tv_out != NULL); + + /* Always in entry part, no need to look up parents etc. */ + if (duk_hobject_find_existing_entry(heap, obj, DUK_HEAP_STRING_INT_VALUE(heap), &e_idx, &h_idx)) { + DUK_ASSERT(e_idx >= 0); + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap, obj, e_idx)); + DUK_TVAL_SET_TVAL(tv_out, DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(heap, obj, e_idx)); + return 1; + } + DUK_TVAL_SET_UNDEFINED(tv_out); + return 0; +} + +DUK_INTERNAL duk_hstring *duk_hobject_get_internal_value_string(duk_heap *heap, duk_hobject *obj) { + duk_tval tv; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(obj != NULL); + + /* This is not strictly necessary, but avoids compiler warnings; e.g. + * gcc won't reliably detect that no uninitialized data is read below. + */ + duk_memzero((void *) &tv, sizeof(duk_tval)); + + if (duk_hobject_get_internal_value(heap, obj, &tv)) { + duk_hstring *h; + DUK_ASSERT(DUK_TVAL_IS_STRING(&tv)); + h = DUK_TVAL_GET_STRING(&tv); + /* No explicit check for string vs. symbol, accept both. */ + return h; + } + + return NULL; +} + +/* + * Arguments handling helpers (argument map mainly). + * + * An arguments object has exotic behavior for some numeric indices. + * Accesses may translate to identifier operations which may have + * arbitrary side effects (potentially invalidating any duk_tval + * pointers). + */ + +/* Lookup 'key' from arguments internal 'map', perform a variable lookup + * if mapped, and leave the result on top of stack (and return non-zero). + * Used in E5 Section 10.6 algorithms [[Get]] and [[GetOwnProperty]]. + */ +DUK_LOCAL +duk_bool_t duk__lookup_arguments_map(duk_hthread *thr, + duk_hobject *obj, + duk_hstring *key, + duk_propdesc *temp_desc, + duk_hobject **out_map, + duk_hobject **out_varenv) { + duk_hobject *map; + duk_hobject *varenv; + duk_bool_t rc; + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_DDD(DUK_DDDPRINT("arguments map lookup: thr=%p, obj=%p, key=%p, temp_desc=%p " + "(obj -> %!O, key -> %!O)", + (void *) thr, (void *) obj, (void *) key, (void *) temp_desc, + (duk_heaphdr *) obj, (duk_heaphdr *) key)); + + if (!duk_hobject_get_own_propdesc(thr, obj, DUK_HTHREAD_STRING_INT_MAP(thr), temp_desc, DUK_GETDESC_FLAG_PUSH_VALUE)) { + DUK_DDD(DUK_DDDPRINT("-> no 'map'")); + return 0; + } + + map = duk_require_hobject(thr, -1); + DUK_ASSERT(map != NULL); + duk_pop_unsafe(thr); /* map is reachable through obj */ + + if (!duk_hobject_get_own_propdesc(thr, map, key, temp_desc, DUK_GETDESC_FLAG_PUSH_VALUE)) { + DUK_DDD(DUK_DDDPRINT("-> 'map' exists, but key not in map")); + return 0; + } + + /* [... varname] */ + DUK_DDD(DUK_DDDPRINT("-> 'map' exists, and contains key, key is mapped to argument/variable binding %!T", + (duk_tval *) duk_get_tval(thr, -1))); + DUK_ASSERT(duk_is_string(thr, -1)); /* guaranteed when building arguments */ + + /* get varenv for varname (callee's declarative lexical environment) */ + rc = duk_hobject_get_own_propdesc(thr, obj, DUK_HTHREAD_STRING_INT_VARENV(thr), temp_desc, DUK_GETDESC_FLAG_PUSH_VALUE); + DUK_UNREF(rc); + DUK_ASSERT(rc != 0); /* arguments MUST have an initialized lexical environment reference */ + varenv = duk_require_hobject(thr, -1); + DUK_ASSERT(varenv != NULL); + duk_pop_unsafe(thr); /* varenv remains reachable through 'obj' */ + + DUK_DDD(DUK_DDDPRINT("arguments varenv is: %!dO", (duk_heaphdr *) varenv)); + + /* success: leave varname in stack */ + *out_map = map; + *out_varenv = varenv; + return 1; /* [... varname] */ +} + +/* Lookup 'key' from arguments internal 'map', and leave replacement value + * on stack top if mapped (and return non-zero). + * Used in E5 Section 10.6 algorithm for [[GetOwnProperty]] (used by [[Get]]). + */ +DUK_LOCAL duk_bool_t duk__check_arguments_map_for_get(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *temp_desc) { + duk_hobject *map; + duk_hobject *varenv; + duk_hstring *varname; + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + if (!duk__lookup_arguments_map(thr, obj, key, temp_desc, &map, &varenv)) { + DUK_DDD(DUK_DDDPRINT("arguments: key not mapped, no exotic get behavior")); + return 0; + } + + /* [... varname] */ + + varname = duk_require_hstring(thr, -1); + DUK_ASSERT(varname != NULL); + duk_pop_unsafe(thr); /* varname is still reachable */ + + DUK_DDD(DUK_DDDPRINT("arguments object automatic getvar for a bound variable; " + "key=%!O, varname=%!O", + (duk_heaphdr *) key, + (duk_heaphdr *) varname)); + + (void) duk_js_getvar_envrec(thr, varenv, varname, 1 /*throw*/); + + /* [... value this_binding] */ + + duk_pop_unsafe(thr); + + /* leave result on stack top */ + return 1; +} + +/* Lookup 'key' from arguments internal 'map', perform a variable write if mapped. + * Used in E5 Section 10.6 algorithm for [[DefineOwnProperty]] (used by [[Put]]). + * Assumes stack top contains 'put' value (which is NOT popped). + */ +DUK_LOCAL void duk__check_arguments_map_for_put(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *temp_desc, duk_bool_t throw_flag) { + duk_hobject *map; + duk_hobject *varenv; + duk_hstring *varname; + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + if (!duk__lookup_arguments_map(thr, obj, key, temp_desc, &map, &varenv)) { + DUK_DDD(DUK_DDDPRINT("arguments: key not mapped, no exotic put behavior")); + return; + } + + /* [... put_value varname] */ + + varname = duk_require_hstring(thr, -1); + DUK_ASSERT(varname != NULL); + duk_pop_unsafe(thr); /* varname is still reachable */ + + DUK_DDD(DUK_DDDPRINT("arguments object automatic putvar for a bound variable; " + "key=%!O, varname=%!O, value=%!T", + (duk_heaphdr *) key, + (duk_heaphdr *) varname, + (duk_tval *) duk_require_tval(thr, -1))); + + /* [... put_value] */ + + /* + * Note: although arguments object variable mappings are only established + * for non-strict functions (and a call to a non-strict function created + * the arguments object in question), an inner strict function may be doing + * the actual property write. Hence the throw_flag applied here comes from + * the property write call. + */ + + duk_js_putvar_envrec(thr, varenv, varname, duk_require_tval(thr, -1), throw_flag); + + /* [... put_value] */ +} + +/* Lookup 'key' from arguments internal 'map', delete mapping if found. + * Used in E5 Section 10.6 algorithm for [[Delete]]. Note that the + * variable/argument itself (where the map points) is not deleted. + */ +DUK_LOCAL void duk__check_arguments_map_for_delete(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *temp_desc) { + duk_hobject *map; + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + if (!duk_hobject_get_own_propdesc(thr, obj, DUK_HTHREAD_STRING_INT_MAP(thr), temp_desc, DUK_GETDESC_FLAG_PUSH_VALUE)) { + DUK_DDD(DUK_DDDPRINT("arguments: key not mapped, no exotic delete behavior")); + return; + } + + map = duk_require_hobject(thr, -1); + DUK_ASSERT(map != NULL); + duk_pop_unsafe(thr); /* map is reachable through obj */ + + DUK_DDD(DUK_DDDPRINT("-> have 'map', delete key %!O from map (if exists)); ignore result", + (duk_heaphdr *) key)); + + /* Note: no recursion issue, we can trust 'map' to behave */ + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_BEHAVIOR(map)); + DUK_DDD(DUK_DDDPRINT("map before deletion: %!O", (duk_heaphdr *) map)); + (void) duk_hobject_delprop_raw(thr, map, key, 0); /* ignore result */ + DUK_DDD(DUK_DDDPRINT("map after deletion: %!O", (duk_heaphdr *) map)); +} + +/* + * ECMAScript compliant [[GetOwnProperty]](P), for internal use only. + * + * If property is found: + * - Fills descriptor fields to 'out_desc' + * - If DUK_GETDESC_FLAG_PUSH_VALUE is set, pushes a value related to the + * property onto the stack ('undefined' for accessor properties). + * - Returns non-zero + * + * If property is not found: + * - 'out_desc' is left in untouched state (possibly garbage) + * - Nothing is pushed onto the stack (not even with DUK_GETDESC_FLAG_PUSH_VALUE + * set) + * - Returns zero + * + * Notes: + * + * - Getting a property descriptor may cause an allocation (and hence + * GC) to take place, hence reachability and refcount of all related + * values matter. Reallocation of value stack, properties, etc may + * invalidate many duk_tval pointers (concretely, those which reside + * in memory areas subject to reallocation). However, heap object + * pointers are never affected (heap objects have stable pointers). + * + * - The value of a plain property is always reachable and has a non-zero + * reference count. + * + * - The value of a virtual property is not necessarily reachable from + * elsewhere and may have a refcount of zero. Hence we push it onto + * the valstack for the caller, which ensures it remains reachable + * while it is needed. + * + * - There are no virtual accessor properties. Hence, all getters and + * setters are always related to concretely stored properties, which + * ensures that the get/set functions in the resulting descriptor are + * reachable and have non-zero refcounts. Should there be virtual + * accessor properties later, this would need to change. + */ + +DUK_LOCAL duk_bool_t duk__get_own_propdesc_raw(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_uint32_t arr_idx, duk_propdesc *out_desc, duk_small_uint_t flags) { + duk_tval *tv; + + DUK_DDD(DUK_DDDPRINT("duk_hobject_get_own_propdesc: thr=%p, obj=%p, key=%p, out_desc=%p, flags=%lx, " + "arr_idx=%ld (obj -> %!O, key -> %!O)", + (void *) thr, (void *) obj, (void *) key, (void *) out_desc, + (long) flags, (long) arr_idx, + (duk_heaphdr *) obj, (duk_heaphdr *) key)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(out_desc != NULL); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_STATS_INC(thr->heap, stats_getownpropdesc_count); + + /* Each code path returning 1 (= found) must fill in all the output + * descriptor fields. We don't do it beforehand because it'd be + * unnecessary work if the property isn't found and would happen + * multiple times for an inheritance chain. + */ + DUK_ASSERT_SET_GARBAGE(out_desc, sizeof(*out_desc)); +#if 0 + out_desc->flags = 0; + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = -1; +#endif + + /* + * Try entries part first because it's the common case. + * + * Array part lookups are usually handled by the array fast path, and + * are not usually inherited. Array and entry parts never contain the + * same keys so the entry part vs. array part order doesn't matter. + */ + + if (duk_hobject_find_existing_entry(thr->heap, obj, key, &out_desc->e_idx, &out_desc->h_idx)) { + duk_int_t e_idx = out_desc->e_idx; + DUK_ASSERT(out_desc->e_idx >= 0); + out_desc->a_idx = -1; + out_desc->flags = DUK_HOBJECT_E_GET_FLAGS(thr->heap, obj, e_idx); + out_desc->get = NULL; + out_desc->set = NULL; + if (DUK_UNLIKELY(out_desc->flags & DUK_PROPDESC_FLAG_ACCESSOR)) { + DUK_DDD(DUK_DDDPRINT("-> found accessor property in entry part")); + out_desc->get = DUK_HOBJECT_E_GET_VALUE_GETTER(thr->heap, obj, e_idx); + out_desc->set = DUK_HOBJECT_E_GET_VALUE_SETTER(thr->heap, obj, e_idx); + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + /* a dummy undefined value is pushed to make valstack + * behavior uniform for caller + */ + duk_push_undefined(thr); + } + } else { + DUK_DDD(DUK_DDDPRINT("-> found plain property in entry part")); + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, e_idx); + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + duk_push_tval(thr, tv); + } + } + goto prop_found; + } + + /* + * Try array part. + */ + + if (DUK_HOBJECT_HAS_ARRAY_PART(obj) && arr_idx != DUK__NO_ARRAY_INDEX) { + if (arr_idx < DUK_HOBJECT_GET_ASIZE(obj)) { + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, arr_idx); + if (!DUK_TVAL_IS_UNUSED(tv)) { + DUK_DDD(DUK_DDDPRINT("-> found in array part")); + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + duk_push_tval(thr, tv); + } + /* implicit attributes */ + out_desc->flags = DUK_PROPDESC_FLAG_WRITABLE | + DUK_PROPDESC_FLAG_CONFIGURABLE | + DUK_PROPDESC_FLAG_ENUMERABLE; + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = (duk_int_t) arr_idx; /* XXX: limit 2G due to being signed */ + goto prop_found; + } + } + } + + DUK_DDD(DUK_DDDPRINT("-> not found as a concrete property")); + + /* + * Not found as a concrete property, check for virtual properties. + */ + + if (!DUK_HOBJECT_HAS_VIRTUAL_PROPERTIES(obj)) { + /* Quick skip. */ + goto prop_not_found; + } + + if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + duk_harray *a; + + DUK_DDD(DUK_DDDPRINT("array object exotic property get for key: %!O, arr_idx: %ld", + (duk_heaphdr *) key, (long) arr_idx)); + + a = (duk_harray *) obj; + DUK_ASSERT_HARRAY_VALID(a); + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + DUK_DDD(DUK_DDDPRINT("-> found, key is 'length', length exotic behavior")); + + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + duk_push_uint(thr, (duk_uint_t) a->length); + } + out_desc->flags = DUK_PROPDESC_FLAG_VIRTUAL; + if (DUK_HARRAY_LENGTH_WRITABLE(a)) { + out_desc->flags |= DUK_PROPDESC_FLAG_WRITABLE; + } + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = -1; + + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)); + goto prop_found_noexotic; /* cannot be arguments exotic */ + } + } else if (DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(obj)) { + DUK_DDD(DUK_DDDPRINT("string object exotic property get for key: %!O, arr_idx: %ld", + (duk_heaphdr *) key, (long) arr_idx)); + + /* XXX: charlen; avoid multiple lookups? */ + + if (arr_idx != DUK__NO_ARRAY_INDEX) { + duk_hstring *h_val; + + DUK_DDD(DUK_DDDPRINT("array index exists")); + + h_val = duk_hobject_get_internal_value_string(thr->heap, obj); + DUK_ASSERT(h_val); + if (arr_idx < DUK_HSTRING_GET_CHARLEN(h_val)) { + DUK_DDD(DUK_DDDPRINT("-> found, array index inside string")); + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + duk_push_hstring(thr, h_val); + duk_substring(thr, -1, arr_idx, arr_idx + 1); /* [str] -> [substr] */ + } + out_desc->flags = DUK_PROPDESC_FLAG_ENUMERABLE | /* E5 Section 15.5.5.2 */ + DUK_PROPDESC_FLAG_VIRTUAL; + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = -1; + + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)); + goto prop_found_noexotic; /* cannot be arguments exotic */ + } else { + /* index is above internal string length -> property is fully normal */ + DUK_DDD(DUK_DDDPRINT("array index outside string -> normal property")); + } + } else if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + duk_hstring *h_val; + + DUK_DDD(DUK_DDDPRINT("-> found, key is 'length', length exotic behavior")); + + h_val = duk_hobject_get_internal_value_string(thr->heap, obj); + DUK_ASSERT(h_val != NULL); + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + duk_push_uint(thr, (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h_val)); + } + out_desc->flags = DUK_PROPDESC_FLAG_VIRTUAL; /* E5 Section 15.5.5.1 */ + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = -1; + + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)); + goto prop_found_noexotic; /* cannot be arguments exotic */ + } + } +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + else if (DUK_HOBJECT_IS_BUFOBJ(obj)) { + duk_hbufobj *h_bufobj; + duk_uint_t byte_off; + duk_small_uint_t elem_size; + + h_bufobj = (duk_hbufobj *) obj; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + DUK_DDD(DUK_DDDPRINT("bufobj property get for key: %!O, arr_idx: %ld", + (duk_heaphdr *) key, (long) arr_idx)); + + if (arr_idx != DUK__NO_ARRAY_INDEX && DUK_HBUFOBJ_HAS_VIRTUAL_INDICES(h_bufobj)) { + DUK_DDD(DUK_DDDPRINT("array index exists")); + + /* Careful with wrapping: arr_idx upshift may easily wrap, whereas + * length downshift won't. + */ + if (arr_idx < (h_bufobj->length >> h_bufobj->shift)) { + byte_off = arr_idx << h_bufobj->shift; /* no wrap assuming h_bufobj->length is valid */ + elem_size = (duk_small_uint_t) (1U << h_bufobj->shift); + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + duk_uint8_t *data; + + if (h_bufobj->buf != NULL && DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_bufobj, byte_off + elem_size)) { + data = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufobj->buf) + h_bufobj->offset + byte_off; + duk_hbufobj_push_validated_read(thr, h_bufobj, data, elem_size); + } else { + DUK_D(DUK_DPRINT("bufobj access out of underlying buffer, ignoring (read zero)")); + duk_push_uint(thr, 0); + } + } + out_desc->flags = DUK_PROPDESC_FLAG_WRITABLE | + DUK_PROPDESC_FLAG_VIRTUAL; + if (DUK_HOBJECT_GET_CLASS_NUMBER(obj) != DUK_HOBJECT_CLASS_ARRAYBUFFER) { + /* ArrayBuffer indices are non-standard and are + * non-enumerable to avoid their serialization. + */ + out_desc->flags |= DUK_PROPDESC_FLAG_ENUMERABLE; + } + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = -1; + + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)); + goto prop_found_noexotic; /* cannot be e.g. arguments exotic, since exotic 'traits' are mutually exclusive */ + } else { + /* index is above internal buffer length -> property is fully normal */ + DUK_DDD(DUK_DDDPRINT("array index outside buffer -> normal property")); + } + } else if (key == DUK_HTHREAD_STRING_LENGTH(thr) && DUK_HBUFOBJ_HAS_VIRTUAL_INDICES(h_bufobj)) { + DUK_DDD(DUK_DDDPRINT("-> found, key is 'length', length exotic behavior")); + + if (flags & DUK_GETDESC_FLAG_PUSH_VALUE) { + /* Length in elements: take into account shift, but + * intentionally don't check the underlying buffer here. + */ + duk_push_uint(thr, h_bufobj->length >> h_bufobj->shift); + } + out_desc->flags = DUK_PROPDESC_FLAG_VIRTUAL; + out_desc->get = NULL; + out_desc->set = NULL; + out_desc->e_idx = -1; + out_desc->h_idx = -1; + out_desc->a_idx = -1; + + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)); + goto prop_found_noexotic; /* cannot be arguments exotic */ + } + } +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + + /* Array properties have exotic behavior but they are concrete, + * so no special handling here. + * + * Arguments exotic behavior (E5 Section 10.6, [[GetOwnProperty]] + * is only relevant as a post-check implemented below; hence no + * check here. + */ + + /* + * Not found as concrete or virtual. + */ + + prop_not_found: + DUK_DDD(DUK_DDDPRINT("-> not found (virtual, entry part, or array part)")); + DUK_STATS_INC(thr->heap, stats_getownpropdesc_miss); + return 0; + + /* + * Found. + * + * Arguments object has exotic post-processing, see E5 Section 10.6, + * description of [[GetOwnProperty]] variant for arguments. + */ + + prop_found: + DUK_DDD(DUK_DDDPRINT("-> property found, checking for arguments exotic post-behavior")); + + /* Notes: + * - Only numbered indices are relevant, so arr_idx fast reject is good + * (this is valid unless there are more than 4**32-1 arguments). + * - Since variable lookup has no side effects, this can be skipped if + * DUK_GETDESC_FLAG_PUSH_VALUE is not set. + */ + + if (DUK_UNLIKELY(DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj) && + arr_idx != DUK__NO_ARRAY_INDEX && + (flags & DUK_GETDESC_FLAG_PUSH_VALUE))) { + duk_propdesc temp_desc; + + /* Magically bound variable cannot be an accessor. However, + * there may be an accessor property (or a plain property) in + * place with magic behavior removed. This happens e.g. when + * a magic property is redefined with defineProperty(). + * Cannot assert for "not accessor" here. + */ + + /* replaces top of stack with new value if necessary */ + DUK_ASSERT((flags & DUK_GETDESC_FLAG_PUSH_VALUE) != 0); + + /* This can perform a variable lookup but only into a declarative + * environment which has no side effects. + */ + if (duk__check_arguments_map_for_get(thr, obj, key, &temp_desc)) { + DUK_DDD(DUK_DDDPRINT("-> arguments exotic behavior overrides result: %!T -> %!T", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + /* [... old_result result] -> [... result] */ + duk_remove_m2(thr); + } + } + + prop_found_noexotic: + DUK_STATS_INC(thr->heap, stats_getownpropdesc_hit); + return 1; +} + +DUK_INTERNAL duk_bool_t duk_hobject_get_own_propdesc(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *out_desc, duk_small_uint_t flags) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(out_desc != NULL); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + return duk__get_own_propdesc_raw(thr, obj, key, DUK_HSTRING_GET_ARRIDX_SLOW(key), out_desc, flags); +} + +/* + * ECMAScript compliant [[GetProperty]](P), for internal use only. + * + * If property is found: + * - Fills descriptor fields to 'out_desc' + * - If DUK_GETDESC_FLAG_PUSH_VALUE is set, pushes a value related to the + * property onto the stack ('undefined' for accessor properties). + * - Returns non-zero + * + * If property is not found: + * - 'out_desc' is left in untouched state (possibly garbage) + * - Nothing is pushed onto the stack (not even with DUK_GETDESC_FLAG_PUSH_VALUE + * set) + * - Returns zero + * + * May cause arbitrary side effects and invalidate (most) duk_tval + * pointers. + */ + +DUK_LOCAL duk_bool_t duk__get_propdesc(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_propdesc *out_desc, duk_small_uint_t flags) { + duk_hobject *curr; + duk_uint32_t arr_idx; + duk_uint_t sanity; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(out_desc != NULL); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_STATS_INC(thr->heap, stats_getpropdesc_count); + + arr_idx = DUK_HSTRING_GET_ARRIDX_FAST(key); + + DUK_DDD(DUK_DDDPRINT("duk__get_propdesc: thr=%p, obj=%p, key=%p, out_desc=%p, flags=%lx, " + "arr_idx=%ld (obj -> %!O, key -> %!O)", + (void *) thr, (void *) obj, (void *) key, (void *) out_desc, + (long) flags, (long) arr_idx, + (duk_heaphdr *) obj, (duk_heaphdr *) key)); + + curr = obj; + DUK_ASSERT(curr != NULL); + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + if (duk__get_own_propdesc_raw(thr, curr, key, arr_idx, out_desc, flags)) { + /* stack contains value (if requested), 'out_desc' is set */ + DUK_STATS_INC(thr->heap, stats_getpropdesc_hit); + return 1; + } + + /* not found in 'curr', next in prototype chain; impose max depth */ + if (DUK_UNLIKELY(sanity-- == 0)) { + if (flags & DUK_GETDESC_FLAG_IGNORE_PROTOLOOP) { + /* treat like property not found */ + break; + } else { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + } + curr = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, curr); + } while (curr != NULL); + + /* out_desc is left untouched (possibly garbage), caller must use return + * value to determine whether out_desc can be looked up + */ + + DUK_STATS_INC(thr->heap, stats_getpropdesc_miss); + return 0; +} + +/* + * Shallow fast path checks for accessing array elements with numeric + * indices. The goal is to try to avoid coercing an array index to an + * (interned) string for the most common lookups, in particular, for + * standard Array objects. + * + * Interning is avoided but only for a very narrow set of cases: + * - Object has array part, index is within array allocation, and + * value is not unused (= key exists) + * - Object has no interfering exotic behavior (e.g. arguments or + * string object exotic behaviors interfere, array exotic + * behavior does not). + * + * Current shortcoming: if key does not exist (even if it is within + * the array allocation range) a slow path lookup with interning is + * always required. This can probably be fixed so that there is a + * quick fast path for non-existent elements as well, at least for + * standard Array objects. + */ + +#if defined(DUK_USE_ARRAY_PROP_FASTPATH) +DUK_LOCAL duk_tval *duk__getprop_shallow_fastpath_array_tval(duk_hthread *thr, duk_hobject *obj, duk_tval *tv_key) { + duk_tval *tv; + duk_uint32_t idx; + + DUK_UNREF(thr); + + if (!(DUK_HOBJECT_HAS_ARRAY_PART(obj) && + !DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj) && + !DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(obj) && + !DUK_HOBJECT_IS_BUFOBJ(obj) && + !DUK_HOBJECT_IS_PROXY(obj))) { + /* Must have array part and no conflicting exotic behaviors. + * Doesn't need to have array special behavior, e.g. Arguments + * object has array part. + */ + return NULL; + } + + /* Arrays never have other exotic behaviors. */ + + DUK_DDD(DUK_DDDPRINT("fast path attempt (no exotic string/arguments/buffer " + "behavior, object has array part)")); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + idx = duk__tval_fastint_to_arr_idx(tv_key); + } else +#endif + if (DUK_TVAL_IS_DOUBLE(tv_key)) { + idx = duk__tval_number_to_arr_idx(tv_key); + } else { + DUK_DDD(DUK_DDDPRINT("key is not a number")); + return NULL; + } + + /* If index is not valid, idx will be DUK__NO_ARRAY_INDEX which + * is 0xffffffffUL. We don't need to check for that explicitly + * because 0xffffffffUL will never be inside object 'a_size'. + */ + + if (idx >= DUK_HOBJECT_GET_ASIZE(obj)) { + DUK_DDD(DUK_DDDPRINT("key is not an array index or outside array part")); + return NULL; + } + DUK_ASSERT(idx != 0xffffffffUL); + DUK_ASSERT(idx != DUK__NO_ARRAY_INDEX); + + /* XXX: for array instances we could take a shortcut here and assume + * Array.prototype doesn't contain an array index property. + */ + + DUK_DDD(DUK_DDDPRINT("key is a valid array index and inside array part")); + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, idx); + if (!DUK_TVAL_IS_UNUSED(tv)) { + DUK_DDD(DUK_DDDPRINT("-> fast path successful")); + return tv; + } + + DUK_DDD(DUK_DDDPRINT("fast path attempt failed, fall back to slow path")); + return NULL; +} + +DUK_LOCAL duk_bool_t duk__putprop_shallow_fastpath_array_tval(duk_hthread *thr, duk_hobject *obj, duk_tval *tv_key, duk_tval *tv_val) { + duk_tval *tv; + duk_harray *a; + duk_uint32_t idx; + duk_uint32_t old_len, new_len; + + if (!(DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj) && + DUK_HOBJECT_HAS_ARRAY_PART(obj) && + DUK_HOBJECT_HAS_EXTENSIBLE(obj))) { + return 0; + } + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)); /* caller ensures */ + + a = (duk_harray *) obj; + DUK_ASSERT_HARRAY_VALID(a); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + idx = duk__tval_fastint_to_arr_idx(tv_key); + } else +#endif + if (DUK_TVAL_IS_DOUBLE(tv_key)) { + idx = duk__tval_number_to_arr_idx(tv_key); + } else { + DUK_DDD(DUK_DDDPRINT("key is not a number")); + return 0; + } + + /* If index is not valid, idx will be DUK__NO_ARRAY_INDEX which + * is 0xffffffffUL. We don't need to check for that explicitly + * because 0xffffffffUL will never be inside object 'a_size'. + */ + + if (idx >= DUK_HOBJECT_GET_ASIZE(obj)) { /* for resizing of array part, use slow path */ + return 0; + } + DUK_ASSERT(idx != 0xffffffffUL); + DUK_ASSERT(idx != DUK__NO_ARRAY_INDEX); + + old_len = a->length; + + if (idx >= old_len) { + DUK_DDD(DUK_DDDPRINT("write new array entry requires length update " + "(arr_idx=%ld, old_len=%ld)", + (long) idx, (long) old_len)); + if (DUK_HARRAY_LENGTH_NONWRITABLE(a)) { + /* The correct behavior here is either a silent error + * or a TypeError, depending on strictness. Fall back + * to the slow path to handle the situation. + */ + return 0; + } + new_len = idx + 1; + + ((duk_harray *) obj)->length = new_len; + } + + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, idx); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv, tv_val); /* side effects */ + + DUK_DDD(DUK_DDDPRINT("array fast path success for index %ld", (long) idx)); + return 1; +} +#endif /* DUK_USE_ARRAY_PROP_FASTPATH */ + +/* + * Fast path for bufobj getprop/putprop + */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_LOCAL duk_bool_t duk__getprop_fastpath_bufobj_tval(duk_hthread *thr, duk_hobject *obj, duk_tval *tv_key) { + duk_uint32_t idx; + duk_hbufobj *h_bufobj; + duk_uint_t byte_off; + duk_small_uint_t elem_size; + duk_uint8_t *data; + + if (!DUK_HOBJECT_IS_BUFOBJ(obj)) { + return 0; + } + h_bufobj = (duk_hbufobj *) obj; + if (!DUK_HBUFOBJ_HAS_VIRTUAL_INDICES(h_bufobj)) { + return 0; + } + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + idx = duk__tval_fastint_to_arr_idx(tv_key); + } else +#endif + if (DUK_TVAL_IS_DOUBLE(tv_key)) { + idx = duk__tval_number_to_arr_idx(tv_key); + } else { + return 0; + } + + /* If index is not valid, idx will be DUK__NO_ARRAY_INDEX which + * is 0xffffffffUL. We don't need to check for that explicitly + * because 0xffffffffUL will never be inside bufobj length. + */ + + /* Careful with wrapping (left shifting idx would be unsafe). */ + if (idx >= (h_bufobj->length >> h_bufobj->shift)) { + return 0; + } + DUK_ASSERT(idx != DUK__NO_ARRAY_INDEX); + + byte_off = idx << h_bufobj->shift; /* no wrap assuming h_bufobj->length is valid */ + elem_size = (duk_small_uint_t) (1U << h_bufobj->shift); + + if (h_bufobj->buf != NULL && DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_bufobj, byte_off + elem_size)) { + data = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufobj->buf) + h_bufobj->offset + byte_off; + duk_hbufobj_push_validated_read(thr, h_bufobj, data, elem_size); + } else { + DUK_D(DUK_DPRINT("bufobj access out of underlying buffer, ignoring (read zero)")); + duk_push_uint(thr, 0); + } + + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) +DUK_LOCAL duk_bool_t duk__putprop_fastpath_bufobj_tval(duk_hthread *thr, duk_hobject *obj, duk_tval *tv_key, duk_tval *tv_val) { + duk_uint32_t idx; + duk_hbufobj *h_bufobj; + duk_uint_t byte_off; + duk_small_uint_t elem_size; + duk_uint8_t *data; + + if (!(DUK_HOBJECT_IS_BUFOBJ(obj) && + DUK_TVAL_IS_NUMBER(tv_val))) { + return 0; + } + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)); /* caller ensures; rom objects are never bufobjs now */ + + h_bufobj = (duk_hbufobj *) obj; + if (!DUK_HBUFOBJ_HAS_VIRTUAL_INDICES(h_bufobj)) { + return 0; + } + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + idx = duk__tval_fastint_to_arr_idx(tv_key); + } else +#endif + if (DUK_TVAL_IS_DOUBLE(tv_key)) { + idx = duk__tval_number_to_arr_idx(tv_key); + } else { + return 0; + } + + /* If index is not valid, idx will be DUK__NO_ARRAY_INDEX which + * is 0xffffffffUL. We don't need to check for that explicitly + * because 0xffffffffUL will never be inside bufobj length. + */ + + /* Careful with wrapping (left shifting idx would be unsafe). */ + if (idx >= (h_bufobj->length >> h_bufobj->shift)) { + return 0; + } + DUK_ASSERT(idx != DUK__NO_ARRAY_INDEX); + + byte_off = idx << h_bufobj->shift; /* no wrap assuming h_bufobj->length is valid */ + elem_size = (duk_small_uint_t) (1U << h_bufobj->shift); + + /* Value is required to be a number in the fast path so there + * are no side effects in write coercion. + */ + duk_push_tval(thr, tv_val); + DUK_ASSERT(duk_is_number(thr, -1)); + + if (h_bufobj->buf != NULL && DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_bufobj, byte_off + elem_size)) { + data = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufobj->buf) + h_bufobj->offset + byte_off; + duk_hbufobj_validated_write(thr, h_bufobj, data, elem_size); + } else { + DUK_D(DUK_DPRINT("bufobj access out of underlying buffer, ignoring (write skipped)")); + } + + duk_pop_unsafe(thr); + return 1; +} +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + +/* + * GETPROP: ECMAScript property read. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_getprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key) { + duk_tval tv_obj_copy; + duk_tval tv_key_copy; + duk_hobject *curr = NULL; + duk_hstring *key = NULL; + duk_uint32_t arr_idx = DUK__NO_ARRAY_INDEX; + duk_propdesc desc; + duk_uint_t sanity; + + DUK_DDD(DUK_DDDPRINT("getprop: thr=%p, obj=%p, key=%p (obj -> %!T, key -> %!T)", + (void *) thr, (void *) tv_obj, (void *) tv_key, + (duk_tval *) tv_obj, (duk_tval *) tv_key)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(tv_obj != NULL); + DUK_ASSERT(tv_key != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_STATS_INC(thr->heap, stats_getprop_all); + + /* + * Make a copy of tv_obj, tv_key, and tv_val to avoid any issues of + * them being invalidated by a valstack resize. + * + * XXX: this is now an overkill for many fast paths. Rework this + * to be faster (although switching to a valstack discipline might + * be a better solution overall). + */ + + DUK_TVAL_SET_TVAL(&tv_obj_copy, tv_obj); + DUK_TVAL_SET_TVAL(&tv_key_copy, tv_key); + tv_obj = &tv_obj_copy; + tv_key = &tv_key_copy; + + /* + * Coercion and fast path processing + */ + + switch (DUK_TVAL_GET_TAG(tv_obj)) { + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: { + /* Note: unconditional throw */ + DUK_DDD(DUK_DDDPRINT("base object is undefined or null -> reject")); +#if defined(DUK_USE_PARANOID_ERRORS) + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_BASE); +#else + DUK_ERROR_FMT2(thr, DUK_ERR_TYPE_ERROR, "cannot read property %s of %s", + duk_push_string_tval_readable(thr, tv_key), duk_push_string_tval_readable(thr, tv_obj)); +#endif + DUK_WO_NORETURN(return 0;); + break; + } + + case DUK_TAG_BOOLEAN: { + DUK_DDD(DUK_DDDPRINT("base object is a boolean, start lookup from boolean prototype")); + curr = thr->builtins[DUK_BIDX_BOOLEAN_PROTOTYPE]; + break; + } + + case DUK_TAG_STRING: { + duk_hstring *h = DUK_TVAL_GET_STRING(tv_obj); + duk_int_t pop_count; + + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + /* Symbols (ES2015 or hidden) don't have virtual properties. */ + DUK_DDD(DUK_DDDPRINT("base object is a symbol, start lookup from symbol prototype")); + curr = thr->builtins[DUK_BIDX_SYMBOL_PROTOTYPE]; + break; + } + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + arr_idx = duk__tval_fastint_to_arr_idx(tv_key); + DUK_DDD(DUK_DDDPRINT("base object string, key is a fast-path fastint; arr_idx %ld", (long) arr_idx)); + pop_count = 0; + } else +#endif + if (DUK_TVAL_IS_NUMBER(tv_key)) { + arr_idx = duk__tval_number_to_arr_idx(tv_key); + DUK_DDD(DUK_DDDPRINT("base object string, key is a fast-path number; arr_idx %ld", (long) arr_idx)); + pop_count = 0; + } else { + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + DUK_DDD(DUK_DDDPRINT("base object string, key is a non-fast-path number; after " + "coercion key is %!T, arr_idx %ld", + (duk_tval *) duk_get_tval(thr, -1), (long) arr_idx)); + pop_count = 1; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && + arr_idx < DUK_HSTRING_GET_CHARLEN(h)) { + duk_pop_n_unsafe(thr, pop_count); + duk_push_hstring(thr, h); + duk_substring(thr, -1, arr_idx, arr_idx + 1); /* [str] -> [substr] */ + + DUK_STATS_INC(thr->heap, stats_getprop_stringidx); + DUK_DDD(DUK_DDDPRINT("-> %!T (base is string, key is an index inside string length " + "after coercion -> return char)", + (duk_tval *) duk_get_tval(thr, -1))); + return 1; + } + + if (pop_count == 0) { + /* This is a pretty awkward control flow, but we need to recheck the + * key coercion here. + */ + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + DUK_DDD(DUK_DDDPRINT("base object string, key is a non-fast-path number; after " + "coercion key is %!T, arr_idx %ld", + (duk_tval *) duk_get_tval(thr, -1), (long) arr_idx)); + } + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + duk_pop_unsafe(thr); /* [key] -> [] */ + duk_push_uint(thr, (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h)); /* [] -> [res] */ + + DUK_STATS_INC(thr->heap, stats_getprop_stringlen); + DUK_DDD(DUK_DDDPRINT("-> %!T (base is string, key is 'length' after coercion -> " + "return string length)", + (duk_tval *) duk_get_tval(thr, -1))); + return 1; + } + + DUK_DDD(DUK_DDDPRINT("base object is a string, start lookup from string prototype")); + curr = thr->builtins[DUK_BIDX_STRING_PROTOTYPE]; + goto lookup; /* avoid double coercion */ + } + + case DUK_TAG_OBJECT: { +#if defined(DUK_USE_ARRAY_PROP_FASTPATH) + duk_tval *tmp; +#endif + + curr = DUK_TVAL_GET_OBJECT(tv_obj); + DUK_ASSERT(curr != NULL); + + /* XXX: array .length fast path (important in e.g. loops)? */ + +#if defined(DUK_USE_ARRAY_PROP_FASTPATH) + tmp = duk__getprop_shallow_fastpath_array_tval(thr, curr, tv_key); + if (tmp) { + duk_push_tval(thr, tmp); + + DUK_DDD(DUK_DDDPRINT("-> %!T (base is object, key is a number, array part " + "fast path)", + (duk_tval *) duk_get_tval(thr, -1))); + DUK_STATS_INC(thr->heap, stats_getprop_arrayidx); + return 1; + } +#endif + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + if (duk__getprop_fastpath_bufobj_tval(thr, curr, tv_key) != 0) { + /* Read value pushed on stack. */ + DUK_DDD(DUK_DDDPRINT("-> %!T (base is bufobj, key is a number, bufobj " + "fast path)", + (duk_tval *) duk_get_tval(thr, -1))); + DUK_STATS_INC(thr->heap, stats_getprop_bufobjidx); + return 1; + } +#endif + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_UNLIKELY(DUK_HOBJECT_IS_PROXY(curr))) { + duk_hobject *h_target; + + if (duk__proxy_check_prop(thr, curr, DUK_STRIDX_GET, tv_key, &h_target)) { + /* -> [ ... trap handler ] */ + DUK_DDD(DUK_DDDPRINT("-> proxy object 'get' for key %!T", (duk_tval *) tv_key)); + DUK_STATS_INC(thr->heap, stats_getprop_proxy); + duk_push_hobject(thr, h_target); /* target */ + duk_push_tval(thr, tv_key); /* P */ + duk_push_tval(thr, tv_obj); /* Receiver: Proxy object */ + duk_call_method(thr, 3 /*nargs*/); + + /* Target object must be checked for a conflicting + * non-configurable property. + */ + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + + if (duk__get_own_propdesc_raw(thr, h_target, key, arr_idx, &desc, DUK_GETDESC_FLAG_PUSH_VALUE)) { + duk_tval *tv_hook = duk_require_tval(thr, -3); /* value from hook */ + duk_tval *tv_targ = duk_require_tval(thr, -1); /* value from target */ + duk_bool_t datadesc_reject; + duk_bool_t accdesc_reject; + + DUK_DDD(DUK_DDDPRINT("proxy 'get': target has matching property %!O, check for " + "conflicting property; tv_hook=%!T, tv_targ=%!T, desc.flags=0x%08lx, " + "desc.get=%p, desc.set=%p", + (duk_heaphdr *) key, (duk_tval *) tv_hook, (duk_tval *) tv_targ, + (unsigned long) desc.flags, + (void *) desc.get, (void *) desc.set)); + + datadesc_reject = !(desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) && + !(desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && + !(desc.flags & DUK_PROPDESC_FLAG_WRITABLE) && + !duk_js_samevalue(tv_hook, tv_targ); + accdesc_reject = (desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) && + !(desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && + (desc.get == NULL) && + !DUK_TVAL_IS_UNDEFINED(tv_hook); + if (datadesc_reject || accdesc_reject) { + DUK_ERROR_TYPE(thr, DUK_STR_PROXY_REJECTED); + DUK_WO_NORETURN(return 0;); + } + + duk_pop_2_unsafe(thr); + } else { + duk_pop_unsafe(thr); + } + return 1; /* return value */ + } + + curr = h_target; /* resume lookup from target */ + DUK_TVAL_SET_OBJECT(tv_obj, curr); + } +#endif /* DUK_USE_ES6_PROXY */ + + if (DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(curr)) { + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + + DUK_STATS_INC(thr->heap, stats_getprop_arguments); + if (duk__check_arguments_map_for_get(thr, curr, key, &desc)) { + DUK_DDD(DUK_DDDPRINT("-> %!T (base is object with arguments exotic behavior, " + "key matches magically bound property -> skip standard " + "Get with replacement value)", + (duk_tval *) duk_get_tval(thr, -1))); + + /* no need for 'caller' post-check, because 'key' must be an array index */ + + duk_remove_m2(thr); /* [key result] -> [result] */ + return 1; + } + + goto lookup; /* avoid double coercion */ + } + break; + } + + /* Buffer has virtual properties similar to string, but indexed values + * are numbers, not 1-byte buffers/strings which would perform badly. + */ + case DUK_TAG_BUFFER: { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv_obj); + duk_int_t pop_count; + + /* + * Because buffer values are often looped over, a number fast path + * is important. + */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + arr_idx = duk__tval_fastint_to_arr_idx(tv_key); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a fast-path fastint; arr_idx %ld", (long) arr_idx)); + pop_count = 0; + } + else +#endif + if (DUK_TVAL_IS_NUMBER(tv_key)) { + arr_idx = duk__tval_number_to_arr_idx(tv_key); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a fast-path number; arr_idx %ld", (long) arr_idx)); + pop_count = 0; + } else { + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a non-fast-path number; after " + "coercion key is %!T, arr_idx %ld", + (duk_tval *) duk_get_tval(thr, -1), (long) arr_idx)); + pop_count = 1; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && + arr_idx < DUK_HBUFFER_GET_SIZE(h)) { + duk_pop_n_unsafe(thr, pop_count); + duk_push_uint(thr, ((duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h))[arr_idx]); + DUK_STATS_INC(thr->heap, stats_getprop_bufferidx); + DUK_DDD(DUK_DDDPRINT("-> %!T (base is buffer, key is an index inside buffer length " + "after coercion -> return byte as number)", + (duk_tval *) duk_get_tval(thr, -1))); + return 1; + } + + if (pop_count == 0) { + /* This is a pretty awkward control flow, but we need to recheck the + * key coercion here. + */ + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a non-fast-path number; after " + "coercion key is %!T, arr_idx %ld", + (duk_tval *) duk_get_tval(thr, -1), (long) arr_idx)); + } + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + duk_pop_unsafe(thr); /* [key] -> [] */ + duk_push_uint(thr, (duk_uint_t) DUK_HBUFFER_GET_SIZE(h)); /* [] -> [res] */ + DUK_STATS_INC(thr->heap, stats_getprop_bufferlen); + + DUK_DDD(DUK_DDDPRINT("-> %!T (base is buffer, key is 'length' " + "after coercion -> return buffer length)", + (duk_tval *) duk_get_tval(thr, -1))); + return 1; + } + + DUK_DDD(DUK_DDDPRINT("base object is a buffer, start lookup from Uint8Array prototype")); + curr = thr->builtins[DUK_BIDX_UINT8ARRAY_PROTOTYPE]; + goto lookup; /* avoid double coercion */ + } + + case DUK_TAG_POINTER: { + DUK_DDD(DUK_DDDPRINT("base object is a pointer, start lookup from pointer prototype")); + curr = thr->builtins[DUK_BIDX_POINTER_PROTOTYPE]; + break; + } + + case DUK_TAG_LIGHTFUNC: { + /* Lightfuncs inherit getter .name and .length from %NativeFunctionPrototype%. */ + DUK_DDD(DUK_DDDPRINT("base object is a lightfunc, start lookup from function prototype")); + curr = thr->builtins[DUK_BIDX_NATIVE_FUNCTION_PROTOTYPE]; + break; + } + +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + /* number */ + DUK_DDD(DUK_DDDPRINT("base object is a number, start lookup from number prototype")); + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv_obj)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_obj)); + curr = thr->builtins[DUK_BIDX_NUMBER_PROTOTYPE]; + break; + } + } + + /* key coercion (unless already coerced above) */ + DUK_ASSERT(key == NULL); + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + /* + * Property lookup + */ + + lookup: + /* [key] (coerced) */ + DUK_ASSERT(curr != NULL); + DUK_ASSERT(key != NULL); + + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + if (!duk__get_own_propdesc_raw(thr, curr, key, arr_idx, &desc, DUK_GETDESC_FLAG_PUSH_VALUE)) { + goto next_in_chain; + } + + if (desc.get != NULL) { + /* accessor with defined getter */ + DUK_ASSERT((desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) != 0); + + duk_pop_unsafe(thr); /* [key undefined] -> [key] */ + duk_push_hobject(thr, desc.get); + duk_push_tval(thr, tv_obj); /* note: original, uncoerced base */ +#if defined(DUK_USE_NONSTD_GETTER_KEY_ARGUMENT) + duk_dup_m3(thr); + duk_call_method(thr, 1); /* [key getter this key] -> [key retval] */ +#else + duk_call_method(thr, 0); /* [key getter this] -> [key retval] */ +#endif + } else { + /* [key value] or [key undefined] */ + + /* data property or accessor without getter */ + DUK_ASSERT(((desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) == 0) || + (desc.get == NULL)); + + /* if accessor without getter, return value is undefined */ + DUK_ASSERT(((desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) == 0) || + duk_is_undefined(thr, -1)); + + /* Note: for an accessor without getter, falling through to + * check for "caller" exotic behavior is unnecessary as + * "undefined" will never activate the behavior. But it does + * no harm, so we'll do it anyway. + */ + } + + goto found; /* [key result] */ + + next_in_chain: + /* XXX: option to pretend property doesn't exist if sanity limit is + * hit might be useful. + */ + if (DUK_UNLIKELY(sanity-- == 0)) { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + curr = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, curr); + } while (curr != NULL); + + /* + * Not found + */ + + duk_to_undefined(thr, -1); /* [key] -> [undefined] (default value) */ + + DUK_DDD(DUK_DDDPRINT("-> %!T (not found)", (duk_tval *) duk_get_tval(thr, -1))); + return 0; + + /* + * Found; post-processing (Function and arguments objects) + */ + + found: + /* [key result] */ + +#if !defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + /* Special behavior for 'caller' property of (non-bound) function objects + * and non-strict Arguments objects: if 'caller' -value- (!) is a strict + * mode function, throw a TypeError (E5 Sections 15.3.5.4, 10.6). + * Quite interestingly, a non-strict function with no formal arguments + * will get an arguments object -without- special 'caller' behavior! + * + * The E5.1 spec is a bit ambiguous if this special behavior applies when + * a bound function is the base value (not the 'caller' value): Section + * 15.3.4.5 (describing bind()) states that [[Get]] for bound functions + * matches that of Section 15.3.5.4 ([[Get]] for Function instances). + * However, Section 13.3.5.4 has "NOTE: Function objects created using + * Function.prototype.bind use the default [[Get]] internal method." + * The current implementation assumes this means that bound functions + * should not have the special [[Get]] behavior. + * + * The E5.1 spec is also a bit unclear if the TypeError throwing is + * applied if the 'caller' value is a strict bound function. The + * current implementation will throw even for both strict non-bound + * and strict bound functions. + * + * See test-dev-strict-func-as-caller-prop-value.js for quite extensive + * tests. + * + * This exotic behavior is disabled when the non-standard 'caller' property + * is enabled, as it conflicts with the free use of 'caller'. + */ + if (key == DUK_HTHREAD_STRING_CALLER(thr) && + DUK_TVAL_IS_OBJECT(tv_obj)) { + duk_hobject *orig = DUK_TVAL_GET_OBJECT(tv_obj); + DUK_ASSERT(orig != NULL); + + if (DUK_HOBJECT_IS_NONBOUND_FUNCTION(orig) || + DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(orig)) { + duk_hobject *h; + + /* XXX: The TypeError is currently not applied to bound + * functions because the 'strict' flag is not copied by + * bind(). This may or may not be correct, the specification + * only refers to the value being a "strict mode Function + * object" which is ambiguous. + */ + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(orig)); + + h = duk_get_hobject(thr, -1); /* NULL if not an object */ + if (h && + DUK_HOBJECT_IS_FUNCTION(h) && + DUK_HOBJECT_HAS_STRICT(h)) { + /* XXX: sufficient to check 'strict', assert for 'is function' */ + DUK_ERROR_TYPE(thr, DUK_STR_STRICT_CALLER_READ); + DUK_WO_NORETURN(return 0;); + } + } + } +#endif /* !DUK_USE_NONSTD_FUNC_CALLER_PROPERTY */ + + duk_remove_m2(thr); /* [key result] -> [result] */ + + DUK_DDD(DUK_DDDPRINT("-> %!T (found)", (duk_tval *) duk_get_tval(thr, -1))); + return 1; +} + +/* + * HASPROP: ECMAScript property existence check ("in" operator). + * + * Interestingly, the 'in' operator does not do any coercion of + * the target object. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_hasprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key) { + duk_tval tv_key_copy; + duk_hobject *obj; + duk_hstring *key; + duk_uint32_t arr_idx; + duk_bool_t rc; + duk_propdesc desc; + + DUK_DDD(DUK_DDDPRINT("hasprop: thr=%p, obj=%p, key=%p (obj -> %!T, key -> %!T)", + (void *) thr, (void *) tv_obj, (void *) tv_key, + (duk_tval *) tv_obj, (duk_tval *) tv_key)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(tv_obj != NULL); + DUK_ASSERT(tv_key != NULL); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_TVAL_SET_TVAL(&tv_key_copy, tv_key); + tv_key = &tv_key_copy; + + /* + * The 'in' operator requires an object as its right hand side, + * throwing a TypeError unconditionally if this is not the case. + * + * However, lightfuncs need to behave like fully fledged objects + * here to be maximally transparent, so we need to handle them + * here. Same goes for plain buffers which behave like ArrayBuffers. + */ + + /* XXX: Refactor key coercion so that it's only called once. It can't + * be trivially lifted here because the object must be type checked + * first. + */ + + if (DUK_TVAL_IS_OBJECT(tv_obj)) { + obj = DUK_TVAL_GET_OBJECT(tv_obj); + DUK_ASSERT(obj != NULL); + + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + } else if (DUK_TVAL_IS_BUFFER(tv_obj)) { + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + if (duk__key_is_plain_buf_ownprop(thr, DUK_TVAL_GET_BUFFER(tv_obj), key, arr_idx)) { + rc = 1; + goto pop_and_return; + } + obj = thr->builtins[DUK_BIDX_UINT8ARRAY_PROTOTYPE]; + } else if (DUK_TVAL_IS_LIGHTFUNC(tv_obj)) { + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + + /* If not found, resume existence check from %NativeFunctionPrototype%. + * We can just substitute the value in this case; nothing will + * need the original base value (as would be the case with e.g. + * setters/getters. + */ + obj = thr->builtins[DUK_BIDX_NATIVE_FUNCTION_PROTOTYPE]; + } else { + /* Note: unconditional throw */ + DUK_DDD(DUK_DDDPRINT("base object is not an object -> reject")); + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_BASE); + DUK_WO_NORETURN(return 0;); + } + + /* XXX: fast path for arrays? */ + + DUK_ASSERT(key != NULL); + DUK_ASSERT(obj != NULL); + DUK_UNREF(arr_idx); + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_UNLIKELY(DUK_HOBJECT_IS_PROXY(obj))) { + duk_hobject *h_target; + duk_bool_t tmp_bool; + + /* XXX: the key in 'key in obj' is string coerced before we're called + * (which is the required behavior in E5/E5.1/E6) so the key is a string + * here already. + */ + + if (duk__proxy_check_prop(thr, obj, DUK_STRIDX_HAS, tv_key, &h_target)) { + /* [ ... key trap handler ] */ + DUK_DDD(DUK_DDDPRINT("-> proxy object 'has' for key %!T", (duk_tval *) tv_key)); + duk_push_hobject(thr, h_target); /* target */ + duk_push_tval(thr, tv_key); /* P */ + duk_call_method(thr, 2 /*nargs*/); + tmp_bool = duk_to_boolean_top_pop(thr); + if (!tmp_bool) { + /* Target object must be checked for a conflicting + * non-configurable property. + */ + + if (duk__get_own_propdesc_raw(thr, h_target, key, arr_idx, &desc, 0 /*flags*/)) { /* don't push value */ + DUK_DDD(DUK_DDDPRINT("proxy 'has': target has matching property %!O, check for " + "conflicting property; desc.flags=0x%08lx, " + "desc.get=%p, desc.set=%p", + (duk_heaphdr *) key, (unsigned long) desc.flags, + (void *) desc.get, (void *) desc.set)); + /* XXX: Extensibility check for target uses IsExtensible(). If we + * implemented the isExtensible trap and didn't reject proxies as + * proxy targets, it should be respected here. + */ + if (!((desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && /* property is configurable and */ + DUK_HOBJECT_HAS_EXTENSIBLE(h_target))) { /* ... target is extensible */ + DUK_ERROR_TYPE(thr, DUK_STR_PROXY_REJECTED); + DUK_WO_NORETURN(return 0;); + } + } + } + + duk_pop_unsafe(thr); /* [ key ] -> [] */ + return tmp_bool; + } + + obj = h_target; /* resume check from proxy target */ + } +#endif /* DUK_USE_ES6_PROXY */ + + /* XXX: inline into a prototype walking loop? */ + + rc = duk__get_propdesc(thr, obj, key, &desc, 0 /*flags*/); /* don't push value */ + /* fall through */ + + pop_and_return: + duk_pop_unsafe(thr); /* [ key ] -> [] */ + return rc; +} + +/* + * HASPROP variant used internally. + * + * This primitive must never throw an error, callers rely on this. + * In particular, don't throw an error for prototype loops; instead, + * pretend like the property doesn't exist if a prototype sanity limit + * is reached. + * + * Does not implement proxy behavior: if applied to a proxy object, + * returns key existence on the proxy object itself. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_hasprop_raw(duk_hthread *thr, duk_hobject *obj, duk_hstring *key) { + duk_propdesc dummy; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + return duk__get_propdesc(thr, obj, key, &dummy, DUK_GETDESC_FLAG_IGNORE_PROTOLOOP); /* don't push value */ +} + +/* + * Helper: handle Array object 'length' write which automatically + * deletes properties, see E5 Section 15.4.5.1, step 3. This is + * quite tricky to get right. + * + * Used by duk_hobject_putprop(). + */ + +/* Coerce a new .length candidate to a number and check that it's a valid + * .length. + */ +DUK_LOCAL duk_uint32_t duk__to_new_array_length_checked(duk_hthread *thr, duk_tval *tv) { + duk_uint32_t res; + duk_double_t d; + +#if !defined(DUK_USE_PREFER_SIZE) +#if defined(DUK_USE_FASTINT) + /* When fastints are enabled, the most interesting case is assigning + * a fastint to .length (e.g. arr.length = 0). + */ + if (DUK_TVAL_IS_FASTINT(tv)) { + /* Very common case. */ + duk_int64_t fi; + fi = DUK_TVAL_GET_FASTINT(tv); + if (fi < 0 || fi > DUK_I64_CONSTANT(0xffffffff)) { + goto fail_range; + } + return (duk_uint32_t) fi; + } +#else /* DUK_USE_FASTINT */ + /* When fastints are not enabled, the most interesting case is any + * number. + */ + if (DUK_TVAL_IS_DOUBLE(tv)) { + d = DUK_TVAL_GET_NUMBER(tv); + } +#endif /* DUK_USE_FASTINT */ + else +#endif /* !DUK_USE_PREFER_SIZE */ + { + /* In all other cases, and when doing a size optimized build, + * fall back to the comprehensive handler. + */ + d = duk_js_tonumber(thr, tv); + } + + /* Refuse to update an Array's 'length' to a value outside the + * 32-bit range. Negative zero is accepted as zero. + */ + res = duk_double_to_uint32_t(d); + if ((duk_double_t) res != d) { + goto fail_range; + } + + return res; + + fail_range: + DUK_ERROR_RANGE(thr, DUK_STR_INVALID_ARRAY_LENGTH); + DUK_WO_NORETURN(return 0;); +} + +/* Delete elements required by a smaller length, taking into account + * potentially non-configurable elements. Returns non-zero if all + * elements could be deleted, and zero if all or some elements could + * not be deleted. Also writes final "target length" to 'out_result_len'. + * This is the length value that should go into the 'length' property + * (must be set by the caller). Never throws an error. + */ +DUK_LOCAL +duk_bool_t duk__handle_put_array_length_smaller(duk_hthread *thr, + duk_hobject *obj, + duk_uint32_t old_len, + duk_uint32_t new_len, + duk_bool_t force_flag, + duk_uint32_t *out_result_len) { + duk_uint32_t target_len; + duk_uint_fast32_t i; + duk_uint32_t arr_idx; + duk_hstring *key; + duk_tval *tv; + duk_bool_t rc; + + DUK_DDD(DUK_DDDPRINT("new array length smaller than old (%ld -> %ld), " + "probably need to remove elements", + (long) old_len, (long) new_len)); + + /* + * New length is smaller than old length, need to delete properties above + * the new length. + * + * If array part exists, this is straightforward: array entries cannot + * be non-configurable so this is guaranteed to work. + * + * If array part does not exist, array-indexed values are scattered + * in the entry part, and some may not be configurable (preventing length + * from becoming lower than their index + 1). To handle the algorithm + * in E5 Section 15.4.5.1, step l correctly, we scan the entire property + * set twice. + */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(new_len < old_len); + DUK_ASSERT(out_result_len != NULL); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)); + DUK_ASSERT(DUK_HOBJECT_IS_ARRAY(obj)); + + if (DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + /* + * All defined array-indexed properties are in the array part + * (we assume the array part is comprehensive), and all array + * entries are writable, configurable, and enumerable. Thus, + * nothing can prevent array entries from being deleted. + */ + + DUK_DDD(DUK_DDDPRINT("have array part, easy case")); + + if (old_len < DUK_HOBJECT_GET_ASIZE(obj)) { + /* XXX: assertion that entries >= old_len are already unused */ + i = old_len; + } else { + i = DUK_HOBJECT_GET_ASIZE(obj); + } + DUK_ASSERT(i <= DUK_HOBJECT_GET_ASIZE(obj)); + + while (i > new_len) { + i--; + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, i); + DUK_TVAL_SET_UNUSED_UPDREF(thr, tv); /* side effects */ + } + + *out_result_len = new_len; + return 1; + } else { + /* + * Entries part is a bit more complex. + */ + + /* Stage 1: find highest preventing non-configurable entry (if any). + * When forcing, ignore non-configurability. + */ + + DUK_DDD(DUK_DDDPRINT("no array part, slow case")); + + DUK_DDD(DUK_DDDPRINT("array length write, no array part, stage 1: find target_len " + "(highest preventing non-configurable entry (if any))")); + + target_len = new_len; + if (force_flag) { + DUK_DDD(DUK_DDDPRINT("array length write, no array part; force flag -> skip stage 1")); + goto skip_stage1; + } + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + key = DUK_HOBJECT_E_GET_KEY(thr->heap, obj, i); + if (!key) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: null key", (long) i)); + continue; + } + if (!DUK_HSTRING_HAS_ARRIDX(key)) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: key not an array index", (long) i)); + continue; + } + + DUK_ASSERT(DUK_HSTRING_HAS_ARRIDX(key)); /* XXX: macro checks for array index flag, which is unnecessary here */ + arr_idx = DUK_HSTRING_GET_ARRIDX_SLOW(key); + DUK_ASSERT(arr_idx != DUK__NO_ARRAY_INDEX); + DUK_ASSERT(arr_idx < old_len); /* consistency requires this */ + + if (arr_idx < new_len) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: key is array index %ld, below new_len", + (long) i, (long) arr_idx)); + continue; + } + if (DUK_HOBJECT_E_SLOT_IS_CONFIGURABLE(thr->heap, obj, i)) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: key is a relevant array index %ld, but configurable", + (long) i, (long) arr_idx)); + continue; + } + + /* relevant array index is non-configurable, blocks write */ + if (arr_idx >= target_len) { + DUK_DDD(DUK_DDDPRINT("entry at index %ld has arr_idx %ld, is not configurable, " + "update target_len %ld -> %ld", + (long) i, (long) arr_idx, (long) target_len, + (long) (arr_idx + 1))); + target_len = arr_idx + 1; + } + } + skip_stage1: + + /* stage 2: delete configurable entries above target length */ + + DUK_DDD(DUK_DDDPRINT("old_len=%ld, new_len=%ld, target_len=%ld", + (long) old_len, (long) new_len, (long) target_len)); + + DUK_DDD(DUK_DDDPRINT("array length write, no array part, stage 2: remove " + "entries >= target_len")); + + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + key = DUK_HOBJECT_E_GET_KEY(thr->heap, obj, i); + if (!key) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: null key", (long) i)); + continue; + } + if (!DUK_HSTRING_HAS_ARRIDX(key)) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: key not an array index", (long) i)); + continue; + } + + DUK_ASSERT(DUK_HSTRING_HAS_ARRIDX(key)); /* XXX: macro checks for array index flag, which is unnecessary here */ + arr_idx = DUK_HSTRING_GET_ARRIDX_SLOW(key); + DUK_ASSERT(arr_idx != DUK__NO_ARRAY_INDEX); + DUK_ASSERT(arr_idx < old_len); /* consistency requires this */ + + if (arr_idx < target_len) { + DUK_DDD(DUK_DDDPRINT("skip entry index %ld: key is array index %ld, below target_len", + (long) i, (long) arr_idx)); + continue; + } + DUK_ASSERT(force_flag || DUK_HOBJECT_E_SLOT_IS_CONFIGURABLE(thr->heap, obj, i)); /* stage 1 guarantees */ + + DUK_DDD(DUK_DDDPRINT("delete entry index %ld: key is array index %ld", + (long) i, (long) arr_idx)); + + /* + * Slow delete, but we don't care as we're already in a very slow path. + * The delete always succeeds: key has no exotic behavior, property + * is configurable, and no resize occurs. + */ + rc = duk_hobject_delprop_raw(thr, obj, key, force_flag ? DUK_DELPROP_FLAG_FORCE : 0); + DUK_UNREF(rc); + DUK_ASSERT(rc != 0); + } + + /* stage 3: update length (done by caller), decide return code */ + + DUK_DDD(DUK_DDDPRINT("array length write, no array part, stage 3: update length (done by caller)")); + + *out_result_len = target_len; + + if (target_len == new_len) { + DUK_DDD(DUK_DDDPRINT("target_len matches new_len, return success")); + return 1; + } + DUK_DDD(DUK_DDDPRINT("target_len does not match new_len (some entry prevented " + "full length adjustment), return error")); + return 0; + } + + DUK_UNREACHABLE(); +} + +/* XXX: is valstack top best place for argument? */ +DUK_LOCAL duk_bool_t duk__handle_put_array_length(duk_hthread *thr, duk_hobject *obj) { + duk_harray *a; + duk_uint32_t old_len; + duk_uint32_t new_len; + duk_uint32_t result_len; + duk_bool_t rc; + + DUK_DDD(DUK_DDDPRINT("handling a put operation to array 'length' exotic property, " + "new val: %!T", + (duk_tval *) duk_get_tval(thr, -1))); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(obj != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)); + DUK_ASSERT(DUK_HOBJECT_IS_ARRAY(obj)); + a = (duk_harray *) obj; + DUK_ASSERT_HARRAY_VALID(a); + + DUK_ASSERT(duk_is_valid_index(thr, -1)); + + /* + * Get old and new length + */ + + old_len = a->length; + new_len = duk__to_new_array_length_checked(thr, DUK_GET_TVAL_NEGIDX(thr, -1)); + DUK_DDD(DUK_DDDPRINT("old_len=%ld, new_len=%ld", (long) old_len, (long) new_len)); + + /* + * Writability check + */ + + if (DUK_HARRAY_LENGTH_NONWRITABLE(a)) { + DUK_DDD(DUK_DDDPRINT("length is not writable, fail")); + return 0; + } + + /* + * New length not lower than old length => no changes needed + * (not even array allocation). + */ + + if (new_len >= old_len) { + DUK_DDD(DUK_DDDPRINT("new length is same or higher than old length, just update length, no deletions")); + a->length = new_len; + return 1; + } + + DUK_DDD(DUK_DDDPRINT("new length is lower than old length, probably must delete entries")); + + /* + * New length lower than old length => delete elements, then + * update length. + * + * Note: even though a bunch of elements have been deleted, the 'desc' is + * still valid as properties haven't been resized (and entries compacted). + */ + + rc = duk__handle_put_array_length_smaller(thr, obj, old_len, new_len, 0 /*force_flag*/, &result_len); + DUK_ASSERT(result_len >= new_len && result_len <= old_len); + + a->length = result_len; + + /* XXX: shrink array allocation or entries compaction here? */ + + return rc; +} + +/* + * PUTPROP: ECMAScript property write. + * + * Unlike ECMAScript primitive which returns nothing, returns 1 to indicate + * success and 0 to indicate failure (assuming throw is not set). + * + * This is an extremely tricky function. Some examples: + * + * * Currently a decref may trigger a GC, which may compact an object's + * property allocation. Consequently, any entry indices (e_idx) will + * be potentially invalidated by a decref. + * + * * Exotic behaviors (strings, arrays, arguments object) require, + * among other things: + * + * - Preprocessing before and postprocessing after an actual property + * write. For example, array index write requires pre-checking the + * array 'length' property for access control, and may require an + * array 'length' update after the actual write has succeeded (but + * not if it fails). + * + * - Deletion of multiple entries, as a result of array 'length' write. + * + * * Input values are taken as pointers which may point to the valstack. + * If valstack is resized because of the put (this may happen at least + * when the array part is abandoned), the pointers can be invalidated. + * (We currently make a copy of all of the input values to avoid issues.) + */ + +DUK_INTERNAL duk_bool_t duk_hobject_putprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key, duk_tval *tv_val, duk_bool_t throw_flag) { + duk_tval tv_obj_copy; + duk_tval tv_key_copy; + duk_tval tv_val_copy; + duk_hobject *orig = NULL; /* NULL if tv_obj is primitive */ + duk_hobject *curr; + duk_hstring *key = NULL; + duk_propdesc desc; + duk_tval *tv; + duk_uint32_t arr_idx; + duk_bool_t rc; + duk_int_t e_idx; + duk_uint_t sanity; + duk_uint32_t new_array_length = 0; /* 0 = no update */ + + DUK_DDD(DUK_DDDPRINT("putprop: thr=%p, obj=%p, key=%p, val=%p, throw=%ld " + "(obj -> %!T, key -> %!T, val -> %!T)", + (void *) thr, (void *) tv_obj, (void *) tv_key, (void *) tv_val, + (long) throw_flag, (duk_tval *) tv_obj, (duk_tval *) tv_key, (duk_tval *) tv_val)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(tv_obj != NULL); + DUK_ASSERT(tv_key != NULL); + DUK_ASSERT(tv_val != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + DUK_STATS_INC(thr->heap, stats_putprop_all); + + /* + * Make a copy of tv_obj, tv_key, and tv_val to avoid any issues of + * them being invalidated by a valstack resize. + * + * XXX: this is an overkill for some paths, so optimize this later + * (or maybe switch to a stack arguments model entirely). + */ + + DUK_TVAL_SET_TVAL(&tv_obj_copy, tv_obj); + DUK_TVAL_SET_TVAL(&tv_key_copy, tv_key); + DUK_TVAL_SET_TVAL(&tv_val_copy, tv_val); + tv_obj = &tv_obj_copy; + tv_key = &tv_key_copy; + tv_val = &tv_val_copy; + + /* + * Coercion and fast path processing. + */ + + switch (DUK_TVAL_GET_TAG(tv_obj)) { + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: { + /* Note: unconditional throw */ + DUK_DDD(DUK_DDDPRINT("base object is undefined or null -> reject (object=%!iT)", + (duk_tval *) tv_obj)); +#if defined(DUK_USE_PARANOID_ERRORS) + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_BASE); +#else + DUK_ERROR_FMT2(thr, DUK_ERR_TYPE_ERROR, "cannot write property %s of %s", + duk_push_string_tval_readable(thr, tv_key), duk_push_string_tval_readable(thr, tv_obj)); +#endif + DUK_WO_NORETURN(return 0;); + break; + } + + case DUK_TAG_BOOLEAN: { + DUK_DDD(DUK_DDDPRINT("base object is a boolean, start lookup from boolean prototype")); + curr = thr->builtins[DUK_BIDX_BOOLEAN_PROTOTYPE]; + break; + } + + case DUK_TAG_STRING: { + duk_hstring *h = DUK_TVAL_GET_STRING(tv_obj); + + /* + * Note: currently no fast path for array index writes. + * They won't be possible anyway as strings are immutable. + */ + + DUK_ASSERT(key == NULL); + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + /* Symbols (ES2015 or hidden) don't have virtual properties. */ + curr = thr->builtins[DUK_BIDX_SYMBOL_PROTOTYPE]; + goto lookup; + } + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + goto fail_not_writable; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && + arr_idx < DUK_HSTRING_GET_CHARLEN(h)) { + goto fail_not_writable; + } + + DUK_DDD(DUK_DDDPRINT("base object is a string, start lookup from string prototype")); + curr = thr->builtins[DUK_BIDX_STRING_PROTOTYPE]; + goto lookup; /* avoid double coercion */ + } + + case DUK_TAG_OBJECT: { + orig = DUK_TVAL_GET_OBJECT(tv_obj); + DUK_ASSERT(orig != NULL); + +#if defined(DUK_USE_ROM_OBJECTS) + /* With this check in place fast paths won't need read-only + * object checks. This is technically incorrect if there are + * setters that cause no writes to ROM objects, but current + * built-ins don't have such setters. + */ + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) orig)) { + DUK_DD(DUK_DDPRINT("attempt to putprop on read-only target object")); + goto fail_not_writable_no_pop; /* Must avoid duk_pop() in exit path */ + } +#endif + + /* The fast path for array property put is not fully compliant: + * If one places conflicting number-indexed properties into + * Array.prototype (for example, a non-writable Array.prototype[7]) + * the fast path will incorrectly ignore them. + * + * This fast path could be made compliant by falling through + * to the slow path if the previous value was UNUSED. This would + * also remove the need to check for extensibility. Right now a + * non-extensible array is slower than an extensible one as far + * as writes are concerned. + * + * The fast path behavior is documented in more detail here: + * tests/ecmascript/test-misc-array-fast-write.js + */ + + /* XXX: array .length? */ + +#if defined(DUK_USE_ARRAY_PROP_FASTPATH) + if (duk__putprop_shallow_fastpath_array_tval(thr, orig, tv_key, tv_val) != 0) { + DUK_DDD(DUK_DDDPRINT("array fast path success")); + DUK_STATS_INC(thr->heap, stats_putprop_arrayidx); + return 1; + } +#endif + +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + if (duk__putprop_fastpath_bufobj_tval(thr, orig, tv_key, tv_val) != 0) { + DUK_DDD(DUK_DDDPRINT("base is bufobj, key is a number, bufobj fast path")); + DUK_STATS_INC(thr->heap, stats_putprop_bufobjidx); + return 1; + } +#endif + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_UNLIKELY(DUK_HOBJECT_IS_PROXY(orig))) { + duk_hobject *h_target; + duk_bool_t tmp_bool; + + if (duk__proxy_check_prop(thr, orig, DUK_STRIDX_SET, tv_key, &h_target)) { + /* -> [ ... trap handler ] */ + DUK_DDD(DUK_DDDPRINT("-> proxy object 'set' for key %!T", (duk_tval *) tv_key)); + DUK_STATS_INC(thr->heap, stats_putprop_proxy); + duk_push_hobject(thr, h_target); /* target */ + duk_push_tval(thr, tv_key); /* P */ + duk_push_tval(thr, tv_val); /* V */ + duk_push_tval(thr, tv_obj); /* Receiver: Proxy object */ + duk_call_method(thr, 4 /*nargs*/); + tmp_bool = duk_to_boolean_top_pop(thr); + if (!tmp_bool) { + goto fail_proxy_rejected; + } + + /* Target object must be checked for a conflicting + * non-configurable property. + */ + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + + if (duk__get_own_propdesc_raw(thr, h_target, key, arr_idx, &desc, DUK_GETDESC_FLAG_PUSH_VALUE)) { + duk_tval *tv_targ = duk_require_tval(thr, -1); + duk_bool_t datadesc_reject; + duk_bool_t accdesc_reject; + + DUK_DDD(DUK_DDDPRINT("proxy 'set': target has matching property %!O, check for " + "conflicting property; tv_val=%!T, tv_targ=%!T, desc.flags=0x%08lx, " + "desc.get=%p, desc.set=%p", + (duk_heaphdr *) key, (duk_tval *) tv_val, (duk_tval *) tv_targ, + (unsigned long) desc.flags, + (void *) desc.get, (void *) desc.set)); + + datadesc_reject = !(desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) && + !(desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && + !(desc.flags & DUK_PROPDESC_FLAG_WRITABLE) && + !duk_js_samevalue(tv_val, tv_targ); + accdesc_reject = (desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) && + !(desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && + (desc.set == NULL); + if (datadesc_reject || accdesc_reject) { + DUK_ERROR_TYPE(thr, DUK_STR_PROXY_REJECTED); + DUK_WO_NORETURN(return 0;); + } + + duk_pop_2_unsafe(thr); + } else { + duk_pop_unsafe(thr); + } + return 1; /* success */ + } + + orig = h_target; /* resume write to target */ + DUK_TVAL_SET_OBJECT(tv_obj, orig); + } +#endif /* DUK_USE_ES6_PROXY */ + + curr = orig; + break; + } + + case DUK_TAG_BUFFER: { + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv_obj); + duk_int_t pop_count = 0; + + /* + * Because buffer values may be looped over and read/written + * from, an array index fast path is important. + */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_key)) { + arr_idx = duk__tval_fastint_to_arr_idx(tv_key); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a fast-path fastint; arr_idx %ld", (long) arr_idx)); + pop_count = 0; + } else +#endif + if (DUK_TVAL_IS_NUMBER(tv_key)) { + arr_idx = duk__tval_number_to_arr_idx(tv_key); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a fast-path number; arr_idx %ld", (long) arr_idx)); + pop_count = 0; + } else { + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a non-fast-path number; after " + "coercion key is %!T, arr_idx %ld", + (duk_tval *) duk_get_tval(thr, -1), (long) arr_idx)); + pop_count = 1; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && + arr_idx < DUK_HBUFFER_GET_SIZE(h)) { + duk_uint8_t *data; + DUK_DDD(DUK_DDDPRINT("writing to buffer data at index %ld", (long) arr_idx)); + data = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h); + + /* XXX: duk_to_int() ensures we'll get 8 lowest bits as + * as input is within duk_int_t range (capped outside it). + */ +#if defined(DUK_USE_FASTINT) + /* Buffer writes are often integers. */ + if (DUK_TVAL_IS_FASTINT(tv_val)) { + data[arr_idx] = (duk_uint8_t) DUK_TVAL_GET_FASTINT_U32(tv_val); + } + else +#endif + { + duk_push_tval(thr, tv_val); + data[arr_idx] = (duk_uint8_t) duk_to_uint32(thr, -1); + pop_count++; + } + + duk_pop_n_unsafe(thr, pop_count); + DUK_DDD(DUK_DDDPRINT("result: success (buffer data write)")); + DUK_STATS_INC(thr->heap, stats_putprop_bufferidx); + return 1; + } + + if (pop_count == 0) { + /* This is a pretty awkward control flow, but we need to recheck the + * key coercion here. + */ + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + DUK_DDD(DUK_DDDPRINT("base object buffer, key is a non-fast-path number; after " + "coercion key is %!T, arr_idx %ld", + (duk_tval *) duk_get_tval(thr, -1), (long) arr_idx)); + } + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + goto fail_not_writable; + } + + DUK_DDD(DUK_DDDPRINT("base object is a buffer, start lookup from Uint8Array prototype")); + curr = thr->builtins[DUK_BIDX_UINT8ARRAY_PROTOTYPE]; + goto lookup; /* avoid double coercion */ + } + + case DUK_TAG_POINTER: { + DUK_DDD(DUK_DDDPRINT("base object is a pointer, start lookup from pointer prototype")); + curr = thr->builtins[DUK_BIDX_POINTER_PROTOTYPE]; + break; + } + + case DUK_TAG_LIGHTFUNC: { + /* Lightfuncs have no own properties and are considered non-extensible. + * However, the write may be captured by an inherited setter which + * means we can't stop the lookup here. + */ + DUK_DDD(DUK_DDDPRINT("base object is a lightfunc, start lookup from function prototype")); + curr = thr->builtins[DUK_BIDX_NATIVE_FUNCTION_PROTOTYPE]; + break; + } + +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + /* number */ + DUK_DDD(DUK_DDDPRINT("base object is a number, start lookup from number prototype")); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_obj)); + curr = thr->builtins[DUK_BIDX_NUMBER_PROTOTYPE]; + break; + } + } + + DUK_ASSERT(key == NULL); + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + + lookup: + + /* + * Check whether the property already exists in the prototype chain. + * Note that the actual write goes into the original base object + * (except if an accessor property captures the write). + */ + + /* [key] */ + + DUK_ASSERT(curr != NULL); + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + if (!duk__get_own_propdesc_raw(thr, curr, key, arr_idx, &desc, 0 /*flags*/)) { /* don't push value */ + goto next_in_chain; + } + + if (desc.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + /* + * Found existing accessor property (own or inherited). + * Call setter with 'this' set to orig, and value as the only argument. + * Setter calls are OK even for ROM objects. + * + * Note: no exotic arguments object behavior, because [[Put]] never + * calls [[DefineOwnProperty]] (E5 Section 8.12.5, step 5.b). + */ + + duk_hobject *setter; + + DUK_DD(DUK_DDPRINT("put to an own or inherited accessor, calling setter")); + + setter = DUK_HOBJECT_E_GET_VALUE_SETTER(thr->heap, curr, desc.e_idx); + if (!setter) { + goto fail_no_setter; + } + duk_push_hobject(thr, setter); + duk_push_tval(thr, tv_obj); /* note: original, uncoerced base */ + duk_push_tval(thr, tv_val); /* [key setter this val] */ +#if defined(DUK_USE_NONSTD_SETTER_KEY_ARGUMENT) + duk_dup_m4(thr); + duk_call_method(thr, 2); /* [key setter this val key] -> [key retval] */ +#else + duk_call_method(thr, 1); /* [key setter this val] -> [key retval] */ +#endif + duk_pop_unsafe(thr); /* ignore retval -> [key] */ + goto success_no_arguments_exotic; + } + + if (orig == NULL) { + /* + * Found existing own or inherited plain property, but original + * base is a primitive value. + */ + DUK_DD(DUK_DDPRINT("attempt to create a new property in a primitive base object")); + goto fail_base_primitive; + } + + if (curr != orig) { + /* + * Found existing inherited plain property. + * Do an access control check, and if OK, write + * new property to 'orig'. + */ + if (!DUK_HOBJECT_HAS_EXTENSIBLE(orig)) { + DUK_DD(DUK_DDPRINT("found existing inherited plain property, but original object is not extensible")); + goto fail_not_extensible; + } + if (!(desc.flags & DUK_PROPDESC_FLAG_WRITABLE)) { + DUK_DD(DUK_DDPRINT("found existing inherited plain property, original object is extensible, but inherited property is not writable")); + goto fail_not_writable; + } + DUK_DD(DUK_DDPRINT("put to new property, object extensible, inherited property found and is writable")); + goto create_new; + } else { + /* + * Found existing own (non-inherited) plain property. + * Do an access control check and update in place. + */ + + if (!(desc.flags & DUK_PROPDESC_FLAG_WRITABLE)) { + DUK_DD(DUK_DDPRINT("found existing own (non-inherited) plain property, but property is not writable")); + goto fail_not_writable; + } + if (desc.flags & DUK_PROPDESC_FLAG_VIRTUAL) { + DUK_DD(DUK_DDPRINT("found existing own (non-inherited) virtual property, property is writable")); + + if (DUK_HOBJECT_IS_ARRAY(curr)) { + /* + * Write to 'length' of an array is a very complex case + * handled in a helper which updates both the array elements + * and writes the new 'length'. The write may result in an + * unconditional RangeError or a partial write (indicated + * by a return code). + * + * Note: the helper has an unnecessary writability check + * for 'length', we already know it is writable. + */ + DUK_ASSERT(key == DUK_HTHREAD_STRING_LENGTH(thr)); /* only virtual array property */ + + DUK_DDD(DUK_DDDPRINT("writing existing 'length' property to array exotic, invoke complex helper")); + + /* XXX: the helper currently assumes stack top contains new + * 'length' value and the whole calling convention is not very + * compatible with what we need. + */ + + duk_push_tval(thr, tv_val); /* [key val] */ + rc = duk__handle_put_array_length(thr, orig); + duk_pop_unsafe(thr); /* [key val] -> [key] */ + if (!rc) { + goto fail_array_length_partial; + } + + /* key is 'length', cannot match argument exotic behavior */ + goto success_no_arguments_exotic; + } +#if defined(DUK_USE_BUFFEROBJECT_SUPPORT) + else if (DUK_HOBJECT_IS_BUFOBJ(curr)) { + duk_hbufobj *h_bufobj; + duk_uint_t byte_off; + duk_small_uint_t elem_size; + + h_bufobj = (duk_hbufobj *) curr; + DUK_ASSERT_HBUFOBJ_VALID(h_bufobj); + + DUK_DD(DUK_DDPRINT("writable virtual property is in buffer object")); + + /* Careful with wrapping: arr_idx upshift may easily wrap, whereas + * length downshift won't. + */ + if (arr_idx < (h_bufobj->length >> h_bufobj->shift) && DUK_HBUFOBJ_HAS_VIRTUAL_INDICES(h_bufobj)) { + duk_uint8_t *data; + DUK_DDD(DUK_DDDPRINT("writing to buffer data at index %ld", (long) arr_idx)); + + DUK_ASSERT(arr_idx != DUK__NO_ARRAY_INDEX); /* index/length check guarantees */ + byte_off = arr_idx << h_bufobj->shift; /* no wrap assuming h_bufobj->length is valid */ + elem_size = (duk_small_uint_t) (1U << h_bufobj->shift); + + /* Coerce to number before validating pointers etc so that the + * number coercions in duk_hbufobj_validated_write() are + * guaranteed to be side effect free and not invalidate the + * pointer checks we do here. + */ + duk_push_tval(thr, tv_val); + (void) duk_to_number_m1(thr); + + if (h_bufobj->buf != NULL && DUK_HBUFOBJ_VALID_BYTEOFFSET_EXCL(h_bufobj, byte_off + elem_size)) { + data = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufobj->buf) + h_bufobj->offset + byte_off; + duk_hbufobj_validated_write(thr, h_bufobj, data, elem_size); + } else { + DUK_D(DUK_DPRINT("bufobj access out of underlying buffer, ignoring (write skipped)")); + } + duk_pop_unsafe(thr); + goto success_no_arguments_exotic; + } + } +#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */ + + DUK_D(DUK_DPRINT("should not happen, key %!O", key)); + goto fail_internal; /* should not happen */ + } + DUK_DD(DUK_DDPRINT("put to existing own plain property, property is writable")); + goto update_old; + } + DUK_UNREACHABLE(); + + next_in_chain: + /* XXX: option to pretend property doesn't exist if sanity limit is + * hit might be useful. + */ + if (DUK_UNLIKELY(sanity-- == 0)) { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + curr = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, curr); + } while (curr != NULL); + + /* + * Property not found in prototype chain. + */ + + DUK_DDD(DUK_DDDPRINT("property not found in prototype chain")); + + if (orig == NULL) { + DUK_DD(DUK_DDPRINT("attempt to create a new property in a primitive base object")); + goto fail_base_primitive; + } + + if (!DUK_HOBJECT_HAS_EXTENSIBLE(orig)) { + DUK_DD(DUK_DDPRINT("put to a new property (not found in prototype chain), but original object not extensible")); + goto fail_not_extensible; + } + + goto create_new; + + update_old: + + /* + * Update an existing property of the base object. + */ + + /* [key] */ + + DUK_DDD(DUK_DDDPRINT("update an existing property of the original object")); + + DUK_ASSERT(orig != NULL); +#if defined(DUK_USE_ROM_OBJECTS) + /* This should not happen because DUK_TAG_OBJECT case checks + * for this already, but check just in case. + */ + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) orig)) { + goto fail_not_writable; + } +#endif + + /* Although there are writable virtual properties (e.g. plain buffer + * and buffer object number indices), they are handled before we come + * here. + */ + DUK_ASSERT((desc.flags & DUK_PROPDESC_FLAG_VIRTUAL) == 0); + DUK_ASSERT(desc.a_idx >= 0 || desc.e_idx >= 0); + + /* Array own property .length is handled above. */ + DUK_ASSERT(!(DUK_HOBJECT_IS_ARRAY(orig) && key == DUK_HTHREAD_STRING_LENGTH(thr))); + + if (desc.e_idx >= 0) { + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, orig, desc.e_idx); + DUK_DDD(DUK_DDDPRINT("previous entry value: %!iT", (duk_tval *) tv)); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv, tv_val); /* side effects; e_idx may be invalidated */ + /* don't touch property attributes or hash part */ + DUK_DD(DUK_DDPRINT("put to an existing entry at index %ld -> new value %!iT", + (long) desc.e_idx, (duk_tval *) tv)); + } else { + /* Note: array entries are always writable, so the writability check + * above is pointless for them. The check could be avoided with some + * refactoring but is probably not worth it. + */ + + DUK_ASSERT(desc.a_idx >= 0); + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, orig, desc.a_idx); + DUK_DDD(DUK_DDDPRINT("previous array value: %!iT", (duk_tval *) tv)); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv, tv_val); /* side effects; a_idx may be invalidated */ + DUK_DD(DUK_DDPRINT("put to an existing array entry at index %ld -> new value %!iT", + (long) desc.a_idx, (duk_tval *) tv)); + } + + /* Regardless of whether property is found in entry or array part, + * it may have arguments exotic behavior (array indices may reside + * in entry part for abandoned / non-existent array parts). + */ + goto success_with_arguments_exotic; + + create_new: + + /* + * Create a new property in the original object. + * + * Exotic properties need to be reconsidered here from a write + * perspective (not just property attributes perspective). + * However, the property does not exist in the object already, + * so this limits the kind of exotic properties that apply. + */ + + /* [key] */ + + DUK_DDD(DUK_DDDPRINT("create new property to original object")); + + DUK_ASSERT(orig != NULL); + + /* Array own property .length is handled above. */ + DUK_ASSERT(!(DUK_HOBJECT_IS_ARRAY(orig) && key == DUK_HTHREAD_STRING_LENGTH(thr))); + +#if defined(DUK_USE_ROM_OBJECTS) + /* This should not happen because DUK_TAG_OBJECT case checks + * for this already, but check just in case. + */ + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) orig)) { + goto fail_not_writable; + } +#endif + + /* Not possible because array object 'length' is present + * from its creation and cannot be deleted, and is thus + * caught as an existing property above. + */ + DUK_ASSERT(!(DUK_HOBJECT_HAS_EXOTIC_ARRAY(orig) && + key == DUK_HTHREAD_STRING_LENGTH(thr))); + + if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(orig) && + arr_idx != DUK__NO_ARRAY_INDEX) { + /* automatic length update */ + duk_uint32_t old_len; + duk_harray *a; + + a = (duk_harray *) orig; + DUK_ASSERT_HARRAY_VALID(a); + + old_len = a->length; + + if (arr_idx >= old_len) { + DUK_DDD(DUK_DDDPRINT("write new array entry requires length update " + "(arr_idx=%ld, old_len=%ld)", + (long) arr_idx, (long) old_len)); + + if (DUK_HARRAY_LENGTH_NONWRITABLE(a)) { + DUK_DD(DUK_DDPRINT("attempt to extend array, but array 'length' is not writable")); + goto fail_not_writable; + } + + /* Note: actual update happens once write has been completed + * without error below. The write should always succeed + * from a specification viewpoint, but we may e.g. run out + * of memory. It's safer in this order. + */ + + DUK_ASSERT(arr_idx != 0xffffffffUL); + new_array_length = arr_idx + 1; /* flag for later write */ + } else { + DUK_DDD(DUK_DDDPRINT("write new array entry does not require length update " + "(arr_idx=%ld, old_len=%ld)", + (long) arr_idx, (long) old_len)); + } + } + + /* write_to_array_part: */ + + /* + * Write to array part? + * + * Note: array abandonding requires a property resize which uses + * 'rechecks' valstack for temporaries and may cause any existing + * valstack pointers to be invalidated. To protect against this, + * tv_obj, tv_key, and tv_val are copies of the original inputs. + */ + + if (arr_idx != DUK__NO_ARRAY_INDEX && + DUK_HOBJECT_HAS_ARRAY_PART(orig)) { + if (arr_idx < DUK_HOBJECT_GET_ASIZE(orig)) { + goto no_array_growth; + } + + /* + * Array needs to grow, but we don't want it becoming too sparse. + * If it were to become sparse, abandon array part, moving all + * array entries into the entries part (for good). + * + * Since we don't keep track of actual density (used vs. size) of + * the array part, we need to estimate somehow. The check is made + * in two parts: + * + * - Check whether the resize need is small compared to the + * current size (relatively); if so, resize without further + * checking (essentially we assume that the original part is + * "dense" so that the result would be dense enough). + * + * - Otherwise, compute the resize using an actual density + * measurement based on counting the used array entries. + */ + + DUK_DDD(DUK_DDDPRINT("write to new array requires array resize, decide whether to do a " + "fast resize without abandon check (arr_idx=%ld, old_size=%ld)", + (long) arr_idx, (long) DUK_HOBJECT_GET_ASIZE(orig))); + + if (duk__abandon_array_slow_check_required(arr_idx, DUK_HOBJECT_GET_ASIZE(orig))) { + duk_uint32_t old_used; + duk_uint32_t old_size; + + DUK_DDD(DUK_DDDPRINT("=> fast check is NOT OK, do slow check for array abandon")); + + duk__compute_a_stats(thr, orig, &old_used, &old_size); + + DUK_DDD(DUK_DDDPRINT("abandon check, array stats: old_used=%ld, old_size=%ld, arr_idx=%ld", + (long) old_used, (long) old_size, (long) arr_idx)); + + /* Note: intentionally use approximations to shave a few instructions: + * a_used = old_used (accurate: old_used + 1) + * a_size = arr_idx (accurate: arr_idx + 1) + */ + if (duk__abandon_array_density_check(old_used, arr_idx)) { + DUK_DD(DUK_DDPRINT("write to new array entry beyond current length, " + "decided to abandon array part (would become too sparse)")); + + /* abandoning requires a props allocation resize and + * 'rechecks' the valstack, invalidating any existing + * valstack value pointers! + */ + duk__abandon_array_checked(thr, orig); + DUK_ASSERT(!DUK_HOBJECT_HAS_ARRAY_PART(orig)); + + goto write_to_entry_part; + } + + DUK_DDD(DUK_DDDPRINT("=> decided to keep array part")); + } else { + DUK_DDD(DUK_DDDPRINT("=> fast resize is OK")); + } + + DUK_DD(DUK_DDPRINT("write to new array entry beyond current length, " + "decided to extend current allocation")); + + duk__grow_props_for_array_item(thr, orig, arr_idx); + + no_array_growth: + + /* Note: assume array part is comprehensive, so that either + * the write goes to the array part, or we've abandoned the + * array above (and will not come here). + */ + + DUK_ASSERT(DUK_HOBJECT_HAS_ARRAY_PART(orig)); + DUK_ASSERT(arr_idx < DUK_HOBJECT_GET_ASIZE(orig)); + + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, orig, arr_idx); + /* prev value must be unused, no decref */ + DUK_ASSERT(DUK_TVAL_IS_UNUSED(tv)); + DUK_TVAL_SET_TVAL(tv, tv_val); + DUK_TVAL_INCREF(thr, tv); + DUK_DD(DUK_DDPRINT("put to new array entry: %ld -> %!T", + (long) arr_idx, (duk_tval *) tv)); + + /* Note: array part values are [[Writable]], [[Enumerable]], + * and [[Configurable]] which matches the required attributes + * here. + */ + goto entry_updated; + } + + write_to_entry_part: + + /* + * Write to entry part + */ + + /* entry allocation updates hash part and increases the key + * refcount; may need a props allocation resize but doesn't + * 'recheck' the valstack. + */ + e_idx = duk__hobject_alloc_entry_checked(thr, orig, key); + DUK_ASSERT(e_idx >= 0); + + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, orig, e_idx); + /* prev value can be garbage, no decref */ + DUK_TVAL_SET_TVAL(tv, tv_val); + DUK_TVAL_INCREF(thr, tv); + DUK_HOBJECT_E_SET_FLAGS(thr->heap, orig, e_idx, DUK_PROPDESC_FLAGS_WEC); + goto entry_updated; + + entry_updated: + + /* + * Possible pending array length update, which must only be done + * if the actual entry write succeeded. + */ + + if (new_array_length > 0) { + /* Note: zero works as a "no update" marker because the new length + * can never be zero after a new property is written. + */ + + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(orig)); + + DUK_DDD(DUK_DDDPRINT("write successful, pending array length update to: %ld", + (long) new_array_length)); + + ((duk_harray *) orig)->length = new_array_length; + } + + /* + * Arguments exotic behavior not possible for new properties: all + * magically bound properties are initially present in the arguments + * object, and if they are deleted, the binding is also removed from + * parameter map. + */ + + goto success_no_arguments_exotic; + + success_with_arguments_exotic: + + /* + * Arguments objects have exotic [[DefineOwnProperty]] which updates + * the internal 'map' of arguments for writes to currently mapped + * arguments. More conretely, writes to mapped arguments generate + * a write to a bound variable. + * + * The [[Put]] algorithm invokes [[DefineOwnProperty]] for existing + * data properties and new properties, but not for existing accessors. + * Hence, in E5 Section 10.6 ([[DefinedOwnProperty]] algorithm), we + * have a Desc with 'Value' (and possibly other properties too), and + * we end up in step 5.b.i. + */ + + if (arr_idx != DUK__NO_ARRAY_INDEX && + DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(orig)) { + /* Note: only numbered indices are relevant, so arr_idx fast reject + * is good (this is valid unless there are more than 4**32-1 arguments). + */ + + DUK_DDD(DUK_DDDPRINT("putprop successful, arguments exotic behavior needed")); + + /* Note: we can reuse 'desc' here */ + + /* XXX: top of stack must contain value, which helper doesn't touch, + * rework to use tv_val directly? + */ + + duk_push_tval(thr, tv_val); + (void) duk__check_arguments_map_for_put(thr, orig, key, &desc, throw_flag); + duk_pop_unsafe(thr); + } + /* fall thru */ + + success_no_arguments_exotic: + /* shared exit path now */ + DUK_DDD(DUK_DDDPRINT("result: success")); + duk_pop_unsafe(thr); /* remove key */ + return 1; + +#if defined(DUK_USE_ES6_PROXY) + fail_proxy_rejected: + DUK_DDD(DUK_DDDPRINT("result: error, proxy rejects")); + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_PROXY_REJECTED); + DUK_WO_NORETURN(return 0;); + } + /* Note: no key on stack */ + return 0; +#endif + + fail_base_primitive: + DUK_DDD(DUK_DDDPRINT("result: error, base primitive")); + if (throw_flag) { +#if defined(DUK_USE_PARANOID_ERRORS) + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_BASE); +#else + DUK_ERROR_FMT2(thr, DUK_ERR_TYPE_ERROR, "cannot write property %s of %s", + duk_push_string_tval_readable(thr, tv_key), duk_push_string_tval_readable(thr, tv_obj)); +#endif + DUK_WO_NORETURN(return 0;); + } + duk_pop_unsafe(thr); /* remove key */ + return 0; + + fail_not_extensible: + DUK_DDD(DUK_DDDPRINT("result: error, not extensible")); + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_EXTENSIBLE); + DUK_WO_NORETURN(return 0;); + } + duk_pop_unsafe(thr); /* remove key */ + return 0; + + fail_not_writable: + DUK_DDD(DUK_DDDPRINT("result: error, not writable")); + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_WRITABLE); + DUK_WO_NORETURN(return 0;); + } + duk_pop_unsafe(thr); /* remove key */ + return 0; + +#if defined(DUK_USE_ROM_OBJECTS) + fail_not_writable_no_pop: + DUK_DDD(DUK_DDDPRINT("result: error, not writable")); + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_WRITABLE); + DUK_WO_NORETURN(return 0;); + } + return 0; +#endif + + fail_array_length_partial: + DUK_DD(DUK_DDPRINT("result: error, array length write only partially successful")); + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); + DUK_WO_NORETURN(return 0;); + } + duk_pop_unsafe(thr); /* remove key */ + return 0; + + fail_no_setter: + DUK_DDD(DUK_DDDPRINT("result: error, accessor property without setter")); + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_SETTER_UNDEFINED); + DUK_WO_NORETURN(return 0;); + } + duk_pop_unsafe(thr); /* remove key */ + return 0; + + fail_internal: + DUK_DDD(DUK_DDDPRINT("result: error, internal")); + if (throw_flag) { + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); + } + duk_pop_unsafe(thr); /* remove key */ + return 0; +} + +/* + * ECMAScript compliant [[Delete]](P, Throw). + */ + +DUK_INTERNAL duk_bool_t duk_hobject_delprop_raw(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_small_uint_t flags) { + duk_propdesc desc; + duk_tval *tv; + duk_uint32_t arr_idx; + duk_bool_t throw_flag; + duk_bool_t force_flag; + + throw_flag = (flags & DUK_DELPROP_FLAG_THROW); + force_flag = (flags & DUK_DELPROP_FLAG_FORCE); + + DUK_DDD(DUK_DDDPRINT("delprop_raw: thr=%p, obj=%p, key=%p, throw=%ld, force=%ld (obj -> %!O, key -> %!O)", + (void *) thr, (void *) obj, (void *) key, (long) throw_flag, (long) force_flag, + (duk_heaphdr *) obj, (duk_heaphdr *) key)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + arr_idx = DUK_HSTRING_GET_ARRIDX_FAST(key); + + /* 0 = don't push current value */ + if (!duk__get_own_propdesc_raw(thr, obj, key, arr_idx, &desc, 0 /*flags*/)) { /* don't push value */ + DUK_DDD(DUK_DDDPRINT("property not found, succeed always")); + goto success; + } + +#if defined(DUK_USE_ROM_OBJECTS) + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) { + DUK_DD(DUK_DDPRINT("attempt to delprop on read-only target object")); + goto fail_not_configurable; + } +#endif + + if ((desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) == 0 && !force_flag) { + goto fail_not_configurable; + } + if (desc.a_idx < 0 && desc.e_idx < 0) { + /* Currently there are no deletable virtual properties, but + * with force_flag we might attempt to delete one. + */ + DUK_DD(DUK_DDPRINT("delete failed: property found, force flag, but virtual (and implicitly non-configurable)")); + goto fail_virtual; + } + + if (desc.a_idx >= 0) { + DUK_ASSERT(desc.e_idx < 0); + + tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, desc.a_idx); + DUK_TVAL_SET_UNUSED_UPDREF(thr, tv); /* side effects */ + goto success; + } else { + DUK_ASSERT(desc.a_idx < 0); + + /* remove hash entry (no decref) */ +#if defined(DUK_USE_HOBJECT_HASH_PART) + if (desc.h_idx >= 0) { + duk_uint32_t *h_base = DUK_HOBJECT_H_GET_BASE(thr->heap, obj); + + DUK_DDD(DUK_DDDPRINT("removing hash entry at h_idx %ld", (long) desc.h_idx)); + DUK_ASSERT(DUK_HOBJECT_GET_HSIZE(obj) > 0); + DUK_ASSERT((duk_uint32_t) desc.h_idx < DUK_HOBJECT_GET_HSIZE(obj)); + h_base[desc.h_idx] = DUK__HASH_DELETED; + } else { + DUK_ASSERT(DUK_HOBJECT_GET_HSIZE(obj) == 0); + } +#else + DUK_ASSERT(DUK_HOBJECT_GET_HSIZE(obj) == 0); +#endif + + /* Remove value. This requires multiple writes so avoid side + * effects via no-refzero macros so that e_idx is not + * invalidated. + */ + DUK_DDD(DUK_DDDPRINT("before removing value, e_idx %ld, key %p, key at slot %p", + (long) desc.e_idx, (void *) key, (void *) DUK_HOBJECT_E_GET_KEY(thr->heap, obj, desc.e_idx))); + DUK_DDD(DUK_DDDPRINT("removing value at e_idx %ld", (long) desc.e_idx)); + if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, desc.e_idx)) { + duk_hobject *tmp; + + tmp = DUK_HOBJECT_E_GET_VALUE_GETTER(thr->heap, obj, desc.e_idx); + DUK_HOBJECT_E_SET_VALUE_GETTER(thr->heap, obj, desc.e_idx, NULL); + DUK_UNREF(tmp); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, tmp); + + tmp = DUK_HOBJECT_E_GET_VALUE_SETTER(thr->heap, obj, desc.e_idx); + DUK_HOBJECT_E_SET_VALUE_SETTER(thr->heap, obj, desc.e_idx, NULL); + DUK_UNREF(tmp); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, tmp); + } else { + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, desc.e_idx); + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, tv); + } +#if 0 + /* Not strictly necessary because if key == NULL, flag MUST be ignored. */ + DUK_HOBJECT_E_SET_FLAGS(thr->heap, obj, desc.e_idx, 0); +#endif + + /* Remove key. */ + DUK_DDD(DUK_DDDPRINT("before removing key, e_idx %ld, key %p, key at slot %p", + (long) desc.e_idx, (void *) key, (void *) DUK_HOBJECT_E_GET_KEY(thr->heap, obj, desc.e_idx))); + DUK_DDD(DUK_DDDPRINT("removing key at e_idx %ld", (long) desc.e_idx)); + DUK_ASSERT(key == DUK_HOBJECT_E_GET_KEY(thr->heap, obj, desc.e_idx)); + DUK_HOBJECT_E_SET_KEY(thr->heap, obj, desc.e_idx, NULL); + DUK_HSTRING_DECREF_NORZ(thr, key); + + /* Trigger refzero side effects only when we're done as a + * finalizer might operate on the object and affect the + * e_idx we're supposed to use. + */ + DUK_REFZERO_CHECK_SLOW(thr); + goto success; + } + + DUK_UNREACHABLE(); + + success: + /* + * Argument exotic [[Delete]] behavior (E5 Section 10.6) is + * a post-check, keeping arguments internal 'map' in sync with + * any successful deletes (note that property does not need to + * exist for delete to 'succeed'). + * + * Delete key from 'map'. Since 'map' only contains array index + * keys, we can use arr_idx for a fast skip. + */ + + DUK_DDD(DUK_DDDPRINT("delete successful, check for arguments exotic behavior")); + + if (arr_idx != DUK__NO_ARRAY_INDEX && DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)) { + /* Note: only numbered indices are relevant, so arr_idx fast reject + * is good (this is valid unless there are more than 4**32-1 arguments). + */ + + DUK_DDD(DUK_DDDPRINT("delete successful, arguments exotic behavior needed")); + + /* Note: we can reuse 'desc' here */ + (void) duk__check_arguments_map_for_delete(thr, obj, key, &desc); + } + + DUK_DDD(DUK_DDDPRINT("delete successful")); + return 1; + + fail_virtual: /* just use the same "not configurable" error message */ + fail_not_configurable: + DUK_DDD(DUK_DDDPRINT("delete failed: property found, not configurable")); + + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); + DUK_WO_NORETURN(return 0;); + } + return 0; +} + +/* + * DELPROP: ECMAScript property deletion. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_delprop(duk_hthread *thr, duk_tval *tv_obj, duk_tval *tv_key, duk_bool_t throw_flag) { + duk_hstring *key = NULL; +#if defined(DUK_USE_ES6_PROXY) + duk_propdesc desc; +#endif + duk_int_t entry_top; + duk_uint32_t arr_idx = DUK__NO_ARRAY_INDEX; + duk_bool_t rc; + + DUK_DDD(DUK_DDDPRINT("delprop: thr=%p, obj=%p, key=%p (obj -> %!T, key -> %!T)", + (void *) thr, (void *) tv_obj, (void *) tv_key, + (duk_tval *) tv_obj, (duk_tval *) tv_key)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(tv_obj != NULL); + DUK_ASSERT(tv_key != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + /* Storing the entry top is cheaper here to ensure stack is correct at exit, + * as there are several paths out. + */ + entry_top = duk_get_top(thr); + + if (DUK_TVAL_IS_UNDEFINED(tv_obj) || + DUK_TVAL_IS_NULL(tv_obj)) { + DUK_DDD(DUK_DDDPRINT("base object is undefined or null -> reject")); + goto fail_invalid_base_uncond; + } + + duk_push_tval(thr, tv_obj); + duk_push_tval(thr, tv_key); + + tv_obj = DUK_GET_TVAL_NEGIDX(thr, -2); + if (DUK_TVAL_IS_OBJECT(tv_obj)) { + duk_hobject *obj = DUK_TVAL_GET_OBJECT(tv_obj); + DUK_ASSERT(obj != NULL); + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_UNLIKELY(DUK_HOBJECT_IS_PROXY(obj))) { + duk_hobject *h_target; + duk_bool_t tmp_bool; + + /* Note: proxy handling must happen before key is string coerced. */ + + if (duk__proxy_check_prop(thr, obj, DUK_STRIDX_DELETE_PROPERTY, tv_key, &h_target)) { + /* -> [ ... obj key trap handler ] */ + DUK_DDD(DUK_DDDPRINT("-> proxy object 'deleteProperty' for key %!T", (duk_tval *) tv_key)); + duk_push_hobject(thr, h_target); /* target */ + duk_dup_m4(thr); /* P */ + duk_call_method(thr, 2 /*nargs*/); + tmp_bool = duk_to_boolean_top_pop(thr); + if (!tmp_bool) { + goto fail_proxy_rejected; /* retval indicates delete failed */ + } + + /* Target object must be checked for a conflicting + * non-configurable property. + */ + tv_key = DUK_GET_TVAL_NEGIDX(thr, -1); + arr_idx = duk__push_tval_to_property_key(thr, tv_key, &key); + DUK_ASSERT(key != NULL); + + if (duk__get_own_propdesc_raw(thr, h_target, key, arr_idx, &desc, 0 /*flags*/)) { /* don't push value */ + duk_small_int_t desc_reject; + + DUK_DDD(DUK_DDDPRINT("proxy 'deleteProperty': target has matching property %!O, check for " + "conflicting property; desc.flags=0x%08lx, " + "desc.get=%p, desc.set=%p", + (duk_heaphdr *) key, (unsigned long) desc.flags, + (void *) desc.get, (void *) desc.set)); + + desc_reject = !(desc.flags & DUK_PROPDESC_FLAG_CONFIGURABLE); + if (desc_reject) { + /* unconditional */ + DUK_ERROR_TYPE(thr, DUK_STR_PROXY_REJECTED); + DUK_WO_NORETURN(return 0;); + } + } + rc = 1; /* success */ + goto done_rc; + } + + obj = h_target; /* resume delete to target */ + } +#endif /* DUK_USE_ES6_PROXY */ + + arr_idx = duk__to_property_key(thr, -1, &key); + DUK_ASSERT(key != NULL); + + rc = duk_hobject_delprop_raw(thr, obj, key, throw_flag ? DUK_DELPROP_FLAG_THROW : 0); + goto done_rc; + } else if (DUK_TVAL_IS_STRING(tv_obj)) { + /* String has .length and array index virtual properties + * which can't be deleted. No need for a symbol check; + * no offending virtual symbols exist. + */ + /* XXX: unnecessary string coercion for array indices, + * intentional to keep small. + */ + duk_hstring *h = DUK_TVAL_GET_STRING(tv_obj); + DUK_ASSERT(h != NULL); + + arr_idx = duk__to_property_key(thr, -1, &key); + DUK_ASSERT(key != NULL); + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + goto fail_not_configurable; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && + arr_idx < DUK_HSTRING_GET_CHARLEN(h)) { + goto fail_not_configurable; + } + } else if (DUK_TVAL_IS_BUFFER(tv_obj)) { + /* XXX: unnecessary string coercion for array indices, + * intentional to keep small; some overlap with string + * handling. + */ + duk_hbuffer *h = DUK_TVAL_GET_BUFFER(tv_obj); + DUK_ASSERT(h != NULL); + + arr_idx = duk__to_property_key(thr, -1, &key); + DUK_ASSERT(key != NULL); + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + goto fail_not_configurable; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && + arr_idx < DUK_HBUFFER_GET_SIZE(h)) { + goto fail_not_configurable; + } + } else if (DUK_TVAL_IS_LIGHTFUNC(tv_obj)) { + /* Lightfunc has no virtual properties since Duktape 2.2 + * so success. Still must coerce key for side effects. + */ + + arr_idx = duk__to_property_key(thr, -1, &key); + DUK_ASSERT(key != NULL); + DUK_UNREF(key); + } + + /* non-object base, no offending virtual property */ + rc = 1; + goto done_rc; + + done_rc: + duk_set_top_unsafe(thr, entry_top); + return rc; + + fail_invalid_base_uncond: + /* Note: unconditional throw */ + DUK_ASSERT(duk_get_top(thr) == entry_top); +#if defined(DUK_USE_PARANOID_ERRORS) + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_BASE); +#else + DUK_ERROR_FMT2(thr, DUK_ERR_TYPE_ERROR, "cannot delete property %s of %s", + duk_push_string_tval_readable(thr, tv_key), duk_push_string_tval_readable(thr, tv_obj)); +#endif + DUK_WO_NORETURN(return 0;); + +#if defined(DUK_USE_ES6_PROXY) + fail_proxy_rejected: + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_PROXY_REJECTED); + DUK_WO_NORETURN(return 0;); + } + duk_set_top_unsafe(thr, entry_top); + return 0; +#endif + + fail_not_configurable: + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); + DUK_WO_NORETURN(return 0;); + } + duk_set_top_unsafe(thr, entry_top); + return 0; +} + +/* + * Internal helper to define a property with specific flags, ignoring + * normal semantics such as extensibility, write protection etc. + * Overwrites any existing value and attributes unless caller requests + * that value only be updated if it doesn't already exists. + * + * Does not support: + * - virtual properties (error if write attempted) + * - getter/setter properties (error if write attempted) + * - non-default (!= WEC) attributes for array entries (error if attempted) + * - array abandoning: if array part exists, it is always extended + * - array 'length' updating + * + * Stack: [... in_val] -> [] + * + * Used for e.g. built-in initialization and environment record + * operations. + */ + +DUK_INTERNAL void duk_hobject_define_property_internal(duk_hthread *thr, duk_hobject *obj, duk_hstring *key, duk_small_uint_t flags) { + duk_propdesc desc; + duk_uint32_t arr_idx; + duk_int_t e_idx; + duk_tval *tv1 = NULL; + duk_tval *tv2 = NULL; + duk_small_uint_t propflags = flags & DUK_PROPDESC_FLAGS_MASK; /* mask out flags not actually stored */ + + DUK_DDD(DUK_DDDPRINT("define new property (internal): thr=%p, obj=%!O, key=%!O, flags=0x%02lx, val=%!T", + (void *) thr, (duk_heaphdr *) obj, (duk_heaphdr *) key, + (unsigned long) flags, (duk_tval *) duk_get_tval(thr, -1))); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)); + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + DUK_ASSERT(duk_is_valid_index(thr, -1)); /* contains value */ + + arr_idx = DUK_HSTRING_GET_ARRIDX_SLOW(key); + + if (duk__get_own_propdesc_raw(thr, obj, key, arr_idx, &desc, 0 /*flags*/)) { /* don't push value */ + if (desc.e_idx >= 0) { + if (flags & DUK_PROPDESC_FLAG_NO_OVERWRITE) { + DUK_DDD(DUK_DDDPRINT("property already exists in the entry part -> skip as requested")); + goto pop_exit; + } + DUK_DDD(DUK_DDDPRINT("property already exists in the entry part -> update value and attributes")); + if (DUK_UNLIKELY(DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, desc.e_idx))) { + DUK_D(DUK_DPRINT("existing property is an accessor, not supported")); + goto error_internal; + } + + DUK_HOBJECT_E_SET_FLAGS(thr->heap, obj, desc.e_idx, propflags); + tv1 = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, desc.e_idx); + } else if (desc.a_idx >= 0) { + if (flags & DUK_PROPDESC_FLAG_NO_OVERWRITE) { + DUK_DDD(DUK_DDDPRINT("property already exists in the array part -> skip as requested")); + goto pop_exit; + } + DUK_DDD(DUK_DDDPRINT("property already exists in the array part -> update value (assert attributes)")); + if (propflags != DUK_PROPDESC_FLAGS_WEC) { + DUK_D(DUK_DPRINT("existing property in array part, but propflags not WEC (0x%02lx)", + (unsigned long) propflags)); + goto error_internal; + } + + tv1 = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, desc.a_idx); + } else { + if (flags & DUK_PROPDESC_FLAG_NO_OVERWRITE) { + DUK_DDD(DUK_DDDPRINT("property already exists but is virtual -> skip as requested")); + goto pop_exit; + } + if (key == DUK_HTHREAD_STRING_LENGTH(thr) && DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + duk_uint32_t new_len; +#if defined(DUK_USE_DEBUG) + duk_uint32_t prev_len; + prev_len = ((duk_harray *) obj)->length; +#endif + new_len = duk__to_new_array_length_checked(thr, DUK_GET_TVAL_NEGIDX(thr, -1)); + ((duk_harray *) obj)->length = new_len; + DUK_D(DUK_DPRINT("internal define property for array .length: %ld -> %ld", + (long) prev_len, (long) ((duk_harray *) obj)->length)); + goto pop_exit; + } + DUK_DD(DUK_DDPRINT("property already exists but is virtual -> failure")); + goto error_virtual; + } + + goto write_value; + } + + if (DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + if (arr_idx != DUK__NO_ARRAY_INDEX) { + DUK_DDD(DUK_DDDPRINT("property does not exist, object has array part -> possibly extend array part and write value (assert attributes)")); + DUK_ASSERT(propflags == DUK_PROPDESC_FLAGS_WEC); + + /* always grow the array, no sparse / abandon support here */ + if (arr_idx >= DUK_HOBJECT_GET_ASIZE(obj)) { + duk__grow_props_for_array_item(thr, obj, arr_idx); + } + + DUK_ASSERT(arr_idx < DUK_HOBJECT_GET_ASIZE(obj)); + tv1 = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, arr_idx); + goto write_value; + } + } + + DUK_DDD(DUK_DDDPRINT("property does not exist, object belongs in entry part -> allocate new entry and write value and attributes")); + e_idx = duk__hobject_alloc_entry_checked(thr, obj, key); /* increases key refcount */ + DUK_ASSERT(e_idx >= 0); + DUK_HOBJECT_E_SET_FLAGS(thr->heap, obj, e_idx, propflags); + tv1 = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, e_idx); + /* new entry: previous value is garbage; set to undefined to share write_value */ + DUK_TVAL_SET_UNDEFINED(tv1); + goto write_value; + + write_value: + /* tv1 points to value storage */ + + tv2 = duk_require_tval(thr, -1); /* late lookup, avoid side effects */ + DUK_DDD(DUK_DDDPRINT("writing/updating value: %!T -> %!T", + (duk_tval *) tv1, (duk_tval *) tv2)); + + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects */ + goto pop_exit; + + pop_exit: + duk_pop_unsafe(thr); /* remove in_val */ + return; + + error_virtual: /* share error message */ + error_internal: + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return;); +} + +/* + * Fast path for defining array indexed values without interning the key. + * This is used by e.g. code for Array prototype and traceback creation so + * must avoid interning. + */ + +DUK_INTERNAL void duk_hobject_define_property_internal_arridx(duk_hthread *thr, duk_hobject *obj, duk_uarridx_t arr_idx, duk_small_uint_t flags) { + duk_hstring *key; + duk_tval *tv1, *tv2; + + DUK_DDD(DUK_DDDPRINT("define new property (internal) arr_idx fast path: thr=%p, obj=%!O, " + "arr_idx=%ld, flags=0x%02lx, val=%!T", + (void *) thr, obj, (long) arr_idx, (unsigned long) flags, + (duk_tval *) duk_get_tval(thr, -1))); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)); + + if (DUK_HOBJECT_HAS_ARRAY_PART(obj) && + arr_idx != DUK__NO_ARRAY_INDEX && + flags == DUK_PROPDESC_FLAGS_WEC) { + DUK_ASSERT((flags & DUK_PROPDESC_FLAG_NO_OVERWRITE) == 0); /* covered by comparison */ + + DUK_DDD(DUK_DDDPRINT("define property to array part (property may or may not exist yet)")); + + /* always grow the array, no sparse / abandon support here */ + if (arr_idx >= DUK_HOBJECT_GET_ASIZE(obj)) { + duk__grow_props_for_array_item(thr, obj, arr_idx); + } + + DUK_ASSERT(arr_idx < DUK_HOBJECT_GET_ASIZE(obj)); + tv1 = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, arr_idx); + tv2 = duk_require_tval(thr, -1); + + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects */ + + duk_pop_unsafe(thr); /* [ ...val ] -> [ ... ] */ + return; + } + + DUK_DDD(DUK_DDDPRINT("define property fast path didn't work, use slow path")); + + key = duk_push_uint_to_hstring(thr, (duk_uint_t) arr_idx); + DUK_ASSERT(key != NULL); + duk_insert(thr, -2); /* [ ... val key ] -> [ ... key val ] */ + + duk_hobject_define_property_internal(thr, obj, key, flags); + + duk_pop_unsafe(thr); /* [ ... key ] -> [ ... ] */ +} + +/* + * Internal helpers for managing object 'length' + */ + +DUK_INTERNAL duk_size_t duk_hobject_get_length(duk_hthread *thr, duk_hobject *obj) { + duk_double_t val; + + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(obj != NULL); + + /* Fast path for Arrays. */ + if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + return ((duk_harray *) obj)->length; + } + + /* Slow path, .length can be e.g. accessor, obj can be a Proxy, etc. */ + duk_push_hobject(thr, obj); + duk_push_hstring_stridx(thr, DUK_STRIDX_LENGTH); + (void) duk_hobject_getprop(thr, + DUK_GET_TVAL_NEGIDX(thr, -2), + DUK_GET_TVAL_NEGIDX(thr, -1)); + val = duk_to_number_m1(thr); + duk_pop_3_unsafe(thr); + + /* This isn't part of ECMAScript semantics; return a value within + * duk_size_t range, or 0 otherwise. + */ + if (val >= 0.0 && val <= (duk_double_t) DUK_SIZE_MAX) { + return (duk_size_t) val; + } + return 0; +} + +/* + * Fast finalizer check for an object. Walks the prototype chain, checking + * for finalizer presence using DUK_HOBJECT_FLAG_HAVE_FINALIZER which is kept + * in sync with the actual property when setting/removing the finalizer. + */ + +#if defined(DUK_USE_HEAPPTR16) +DUK_INTERNAL duk_bool_t duk_hobject_has_finalizer_fast_raw(duk_heap *heap, duk_hobject *obj) { +#else +DUK_INTERNAL duk_bool_t duk_hobject_has_finalizer_fast_raw(duk_hobject *obj) { +#endif + duk_uint_t sanity; + + DUK_ASSERT(obj != NULL); + + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + if (DUK_UNLIKELY(DUK_HOBJECT_HAS_HAVE_FINALIZER(obj))) { + return 1; + } + if (DUK_UNLIKELY(sanity-- == 0)) { + DUK_D(DUK_DPRINT("prototype loop when checking for finalizer existence; returning false")); + return 0; + } +#if defined(DUK_USE_HEAPPTR16) + DUK_ASSERT(heap != NULL); + obj = DUK_HOBJECT_GET_PROTOTYPE(heap, obj); +#else + obj = DUK_HOBJECT_GET_PROTOTYPE(NULL, obj); /* 'heap' arg ignored */ +#endif + } while (obj != NULL); + + return 0; +} + +/* + * Object.getOwnPropertyDescriptor() (E5 Sections 15.2.3.3, 8.10.4) + * + * [ ... key ] -> [ ... desc/undefined ] + */ + +DUK_INTERNAL void duk_hobject_object_get_own_property_descriptor(duk_hthread *thr, duk_idx_t obj_idx) { + duk_hobject *obj; + duk_hstring *key; + duk_propdesc pd; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + + obj = duk_require_hobject_promote_mask(thr, obj_idx, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + key = duk_to_property_key_hstring(thr, -1); + DUK_ASSERT(key != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + if (!duk_hobject_get_own_propdesc(thr, obj, key, &pd, DUK_GETDESC_FLAG_PUSH_VALUE)) { + duk_push_undefined(thr); + duk_remove_m2(thr); + return; + } + + duk_push_object(thr); + + /* [ ... key value desc ] */ + + if (DUK_PROPDESC_IS_ACCESSOR(&pd)) { + /* If a setter/getter is missing (undefined), the descriptor must + * still have the property present with the value 'undefined'. + */ + if (pd.get) { + duk_push_hobject(thr, pd.get); + } else { + duk_push_undefined(thr); + } + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_GET); + if (pd.set) { + duk_push_hobject(thr, pd.set); + } else { + duk_push_undefined(thr); + } + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_SET); + } else { + duk_dup_m2(thr); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_VALUE); + duk_push_boolean(thr, DUK_PROPDESC_IS_WRITABLE(&pd)); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_WRITABLE); + } + duk_push_boolean(thr, DUK_PROPDESC_IS_ENUMERABLE(&pd)); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_ENUMERABLE); + duk_push_boolean(thr, DUK_PROPDESC_IS_CONFIGURABLE(&pd)); + duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_CONFIGURABLE); + + /* [ ... key value desc ] */ + + duk_replace(thr, -3); + duk_pop_unsafe(thr); /* -> [ ... desc ] */ +} + +/* + * NormalizePropertyDescriptor() related helper. + * + * Internal helper which validates and normalizes a property descriptor + * represented as an ECMAScript object (e.g. argument to defineProperty()). + * The output of this conversion is a set of defprop_flags and possibly + * some values pushed on the value stack to (1) ensure borrowed pointers + * remain valid, and (2) avoid unnecessary pops for footprint reasons. + * Caller must manage stack top carefully because the number of values + * pushed depends on the input property descriptor. + * + * The original descriptor object must not be altered in the process. + */ + +/* XXX: very basic optimization -> duk_get_prop_stridx_top */ + +DUK_INTERNAL +void duk_hobject_prepare_property_descriptor(duk_hthread *thr, + duk_idx_t idx_in, + duk_uint_t *out_defprop_flags, + duk_idx_t *out_idx_value, + duk_hobject **out_getter, + duk_hobject **out_setter) { + duk_idx_t idx_value = -1; + duk_hobject *getter = NULL; + duk_hobject *setter = NULL; + duk_bool_t is_data_desc = 0; + duk_bool_t is_acc_desc = 0; + duk_uint_t defprop_flags = 0; + + DUK_ASSERT(out_defprop_flags != NULL); + DUK_ASSERT(out_idx_value != NULL); + DUK_ASSERT(out_getter != NULL); + DUK_ASSERT(out_setter != NULL); + DUK_ASSERT(idx_in <= 0x7fffL); /* short variants would be OK, but not used to avoid shifts */ + + /* Must be an object, otherwise TypeError (E5.1 Section 8.10.5, step 1). */ + idx_in = duk_require_normalize_index(thr, idx_in); + (void) duk_require_hobject(thr, idx_in); + + /* The coercion order must match the ToPropertyDescriptor() algorithm + * so that side effects in coercion happen in the correct order. + * (This order also happens to be compatible with duk_def_prop(), + * although it doesn't matter in practice.) + */ + + if (duk_get_prop_stridx(thr, idx_in, DUK_STRIDX_VALUE)) { + is_data_desc = 1; + defprop_flags |= DUK_DEFPROP_HAVE_VALUE; + idx_value = duk_get_top_index(thr); + } + + if (duk_get_prop_stridx(thr, idx_in, DUK_STRIDX_WRITABLE)) { + is_data_desc = 1; + if (duk_to_boolean_top_pop(thr)) { + defprop_flags |= DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_WRITABLE; + } else { + defprop_flags |= DUK_DEFPROP_HAVE_WRITABLE; + } + } + + if (duk_get_prop_stridx(thr, idx_in, DUK_STRIDX_GET)) { + duk_tval *tv = duk_require_tval(thr, -1); + duk_hobject *h_get; + + if (DUK_TVAL_IS_UNDEFINED(tv)) { + /* undefined is accepted */ + DUK_ASSERT(getter == NULL); + } else { + /* NOTE: lightfuncs are coerced to full functions because + * lightfuncs don't fit into a property value slot. This + * has some side effects, see test-dev-lightfunc-accessor.js. + */ + h_get = duk_get_hobject_promote_lfunc(thr, -1); + if (h_get == NULL || !DUK_HOBJECT_IS_CALLABLE(h_get)) { + goto type_error; + } + getter = h_get; + } + is_acc_desc = 1; + defprop_flags |= DUK_DEFPROP_HAVE_GETTER; + } + + if (duk_get_prop_stridx(thr, idx_in, DUK_STRIDX_SET)) { + duk_tval *tv = duk_require_tval(thr, -1); + duk_hobject *h_set; + + if (DUK_TVAL_IS_UNDEFINED(tv)) { + /* undefined is accepted */ + DUK_ASSERT(setter == NULL); + } else { + /* NOTE: lightfuncs are coerced to full functions because + * lightfuncs don't fit into a property value slot. This + * has some side effects, see test-dev-lightfunc-accessor.js. + */ + h_set = duk_get_hobject_promote_lfunc(thr, -1); + if (h_set == NULL || !DUK_HOBJECT_IS_CALLABLE(h_set)) { + goto type_error; + } + setter = h_set; + } + is_acc_desc = 1; + defprop_flags |= DUK_DEFPROP_HAVE_SETTER; + } + + if (duk_get_prop_stridx(thr, idx_in, DUK_STRIDX_ENUMERABLE)) { + if (duk_to_boolean_top_pop(thr)) { + defprop_flags |= DUK_DEFPROP_HAVE_ENUMERABLE | DUK_DEFPROP_ENUMERABLE; + } else { + defprop_flags |= DUK_DEFPROP_HAVE_ENUMERABLE; + } + } + + if (duk_get_prop_stridx(thr, idx_in, DUK_STRIDX_CONFIGURABLE)) { + if (duk_to_boolean_top_pop(thr)) { + defprop_flags |= DUK_DEFPROP_HAVE_CONFIGURABLE | DUK_DEFPROP_CONFIGURABLE; + } else { + defprop_flags |= DUK_DEFPROP_HAVE_CONFIGURABLE; + } + } + + if (is_data_desc && is_acc_desc) { + goto type_error; + } + + *out_defprop_flags = defprop_flags; + *out_idx_value = idx_value; + *out_getter = getter; + *out_setter = setter; + + /* [ ... [multiple values] ] */ + return; + + type_error: + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_DESCRIPTOR); + DUK_WO_NORETURN(return;); +} + +/* + * Object.defineProperty() related helper (E5 Section 15.2.3.6). + * Also handles ES2015 Reflect.defineProperty(). + * + * Inlines all [[DefineOwnProperty]] exotic behaviors. + * + * Note: ECMAScript compliant [[DefineOwnProperty]](P, Desc, Throw) is not + * implemented directly, but Object.defineProperty() serves its purpose. + * We don't need the [[DefineOwnProperty]] internally and we don't have a + * property descriptor with 'missing values' so it's easier to avoid it + * entirely. + * + * Note: this is only called for actual objects, not primitive values. + * This must support virtual properties for full objects (e.g. Strings) + * but not for plain values (e.g. strings). Lightfuncs, even though + * primitive in a sense, are treated like objects and accepted as target + * values. + */ + +/* XXX: this is a major target for size optimization */ +DUK_INTERNAL +duk_bool_t duk_hobject_define_property_helper(duk_hthread *thr, + duk_uint_t defprop_flags, + duk_hobject *obj, + duk_hstring *key, + duk_idx_t idx_value, + duk_hobject *get, + duk_hobject *set, + duk_bool_t throw_flag) { + duk_uint32_t arr_idx; + duk_tval tv; + duk_bool_t has_enumerable; + duk_bool_t has_configurable; + duk_bool_t has_writable; + duk_bool_t has_value; + duk_bool_t has_get; + duk_bool_t has_set; + duk_bool_t is_enumerable; + duk_bool_t is_configurable; + duk_bool_t is_writable; + duk_bool_t force_flag; + duk_small_uint_t new_flags; + duk_propdesc curr; + duk_uint32_t arridx_new_array_length; /* != 0 => post-update for array 'length' (used when key is an array index) */ + duk_uint32_t arrlen_old_len; + duk_uint32_t arrlen_new_len; + duk_bool_t pending_write_protect; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + DUK_ASSERT(key != NULL); + /* idx_value may be < 0 (no value), set and get may be NULL */ + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + + /* All the flags fit in 16 bits, so will fit into duk_bool_t. */ + + has_writable = (defprop_flags & DUK_DEFPROP_HAVE_WRITABLE); + has_enumerable = (defprop_flags & DUK_DEFPROP_HAVE_ENUMERABLE); + has_configurable = (defprop_flags & DUK_DEFPROP_HAVE_CONFIGURABLE); + has_value = (defprop_flags & DUK_DEFPROP_HAVE_VALUE); + has_get = (defprop_flags & DUK_DEFPROP_HAVE_GETTER); + has_set = (defprop_flags & DUK_DEFPROP_HAVE_SETTER); + is_writable = (defprop_flags & DUK_DEFPROP_WRITABLE); + is_enumerable = (defprop_flags & DUK_DEFPROP_ENUMERABLE); + is_configurable = (defprop_flags & DUK_DEFPROP_CONFIGURABLE); + force_flag = (defprop_flags & DUK_DEFPROP_FORCE); + + arr_idx = DUK_HSTRING_GET_ARRIDX_SLOW(key); + + arridx_new_array_length = 0; + pending_write_protect = 0; + arrlen_old_len = 0; + arrlen_new_len = 0; + + DUK_DDD(DUK_DDDPRINT("has_enumerable=%ld is_enumerable=%ld " + "has_configurable=%ld is_configurable=%ld " + "has_writable=%ld is_writable=%ld " + "has_value=%ld value=%!T " + "has_get=%ld get=%p=%!O " + "has_set=%ld set=%p=%!O " + "arr_idx=%ld throw_flag=!%ld", + (long) has_enumerable, (long) is_enumerable, + (long) has_configurable, (long) is_configurable, + (long) has_writable, (long) is_writable, + (long) has_value, (duk_tval *) (idx_value >= 0 ? duk_get_tval(thr, idx_value) : NULL), + (long) has_get, (void *) get, (duk_heaphdr *) get, + (long) has_set, (void *) set, (duk_heaphdr *) set, + (long) arr_idx, (long) throw_flag)); + + /* + * Array exotic behaviors can be implemented at this point. The local variables + * are essentially a 'value copy' of the input descriptor (Desc), which is modified + * by the Array [[DefineOwnProperty]] (E5 Section 15.4.5.1). + */ + + if (!DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + goto skip_array_exotic; + } + + if (key == DUK_HTHREAD_STRING_LENGTH(thr)) { + duk_harray *a; + + /* E5 Section 15.4.5.1, step 3, steps a - i are implemented here, j - n at the end */ + if (!has_value) { + DUK_DDD(DUK_DDDPRINT("exotic array behavior for 'length', but no value in descriptor -> normal behavior")); + goto skip_array_exotic; + } + + DUK_DDD(DUK_DDDPRINT("exotic array behavior for 'length', value present in descriptor -> exotic behavior")); + + /* + * Get old and new length + */ + + a = (duk_harray *) obj; + DUK_ASSERT_HARRAY_VALID(a); + arrlen_old_len = a->length; + + DUK_ASSERT(idx_value >= 0); + arrlen_new_len = duk__to_new_array_length_checked(thr, DUK_GET_TVAL_POSIDX(thr, idx_value)); + duk_push_u32(thr, arrlen_new_len); + duk_replace(thr, idx_value); /* step 3.e: replace 'Desc.[[Value]]' */ + + DUK_DDD(DUK_DDDPRINT("old_len=%ld, new_len=%ld", (long) arrlen_old_len, (long) arrlen_new_len)); + + if (arrlen_new_len >= arrlen_old_len) { + /* standard behavior, step 3.f.i */ + DUK_DDD(DUK_DDDPRINT("new length is same or higher as previous => standard behavior")); + goto skip_array_exotic; + } + DUK_DDD(DUK_DDDPRINT("new length is smaller than previous => exotic post behavior")); + + /* XXX: consolidated algorithm step 15.f -> redundant? */ + if (DUK_HARRAY_LENGTH_NONWRITABLE(a) && !force_flag) { + /* Array .length is always non-configurable; if it's also + * non-writable, don't allow it to be written. + */ + goto fail_not_configurable; + } + + /* steps 3.h and 3.i */ + if (has_writable && !is_writable) { + DUK_DDD(DUK_DDDPRINT("desc writable is false, force it back to true, and flag pending write protect")); + is_writable = 1; + pending_write_protect = 1; + } + + /* remaining actual steps are carried out if standard DefineOwnProperty succeeds */ + } else if (arr_idx != DUK__NO_ARRAY_INDEX) { + /* XXX: any chance of unifying this with the 'length' key handling? */ + + /* E5 Section 15.4.5.1, step 4 */ + duk_uint32_t old_len; + duk_harray *a; + + a = (duk_harray *) obj; + DUK_ASSERT_HARRAY_VALID(a); + + old_len = a->length; + + if (arr_idx >= old_len) { + DUK_DDD(DUK_DDDPRINT("defineProperty requires array length update " + "(arr_idx=%ld, old_len=%ld)", + (long) arr_idx, (long) old_len)); + + if (DUK_HARRAY_LENGTH_NONWRITABLE(a) && !force_flag) { + /* Array .length is always non-configurable, so + * if it's also non-writable, don't allow a value + * write. With force flag allow writing. + */ + goto fail_not_configurable; + } + + /* actual update happens once write has been completed without + * error below. + */ + DUK_ASSERT(arr_idx != 0xffffffffUL); + arridx_new_array_length = arr_idx + 1; + } else { + DUK_DDD(DUK_DDDPRINT("defineProperty does not require length update " + "(arr_idx=%ld, old_len=%ld) -> standard behavior", + (long) arr_idx, (long) old_len)); + } + } + skip_array_exotic: + + /* XXX: There is currently no support for writing buffer object + * indexed elements here. Attempt to do so will succeed and + * write a concrete property into the buffer object. This should + * be fixed at some point but because buffers are a custom feature + * anyway, this is relatively unimportant. + */ + + /* + * Actual Object.defineProperty() default algorithm. + */ + + /* + * First check whether property exists; if not, simple case. This covers + * steps 1-4. + */ + + if (!duk__get_own_propdesc_raw(thr, obj, key, arr_idx, &curr, DUK_GETDESC_FLAG_PUSH_VALUE)) { + DUK_DDD(DUK_DDDPRINT("property does not exist")); + + if (!DUK_HOBJECT_HAS_EXTENSIBLE(obj) && !force_flag) { + goto fail_not_extensible; + } + +#if defined(DUK_USE_ROM_OBJECTS) + /* ROM objects are never extensible but force flag may + * allow us to come here anyway. + */ + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj) || !DUK_HOBJECT_HAS_EXTENSIBLE(obj)); + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) { + DUK_D(DUK_DPRINT("attempt to define property on a read-only target object")); + goto fail_not_configurable; + } +#endif + + /* XXX: share final setting code for value and flags? difficult because + * refcount code is different. Share entry allocation? But can't allocate + * until array index checked. + */ + + /* steps 4.a and 4.b are tricky */ + if (has_set || has_get) { + duk_int_t e_idx; + + DUK_DDD(DUK_DDDPRINT("create new accessor property")); + + DUK_ASSERT(has_set || set == NULL); + DUK_ASSERT(has_get || get == NULL); + DUK_ASSERT(!has_value); + DUK_ASSERT(!has_writable); + + new_flags = DUK_PROPDESC_FLAG_ACCESSOR; /* defaults, E5 Section 8.6.1, Table 7 */ + if (has_enumerable && is_enumerable) { + new_flags |= DUK_PROPDESC_FLAG_ENUMERABLE; + } + if (has_configurable && is_configurable) { + new_flags |= DUK_PROPDESC_FLAG_CONFIGURABLE; + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + DUK_DDD(DUK_DDDPRINT("accessor cannot go to array part, abandon array")); + duk__abandon_array_checked(thr, obj); + } + + /* write to entry part */ + e_idx = duk__hobject_alloc_entry_checked(thr, obj, key); + DUK_ASSERT(e_idx >= 0); + + DUK_HOBJECT_E_SET_VALUE_GETTER(thr->heap, obj, e_idx, get); + DUK_HOBJECT_E_SET_VALUE_SETTER(thr->heap, obj, e_idx, set); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, get); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, set); + + DUK_HOBJECT_E_SET_FLAGS(thr->heap, obj, e_idx, new_flags); + goto success_exotics; + } else { + duk_int_t e_idx; + duk_tval *tv2; + + DUK_DDD(DUK_DDDPRINT("create new data property")); + + DUK_ASSERT(!has_set); + DUK_ASSERT(!has_get); + + new_flags = 0; /* defaults, E5 Section 8.6.1, Table 7 */ + if (has_writable && is_writable) { + new_flags |= DUK_PROPDESC_FLAG_WRITABLE; + } + if (has_enumerable && is_enumerable) { + new_flags |= DUK_PROPDESC_FLAG_ENUMERABLE; + } + if (has_configurable && is_configurable) { + new_flags |= DUK_PROPDESC_FLAG_CONFIGURABLE; + } + if (has_value) { + duk_tval *tv_tmp = duk_require_tval(thr, idx_value); + DUK_TVAL_SET_TVAL(&tv, tv_tmp); + } else { + DUK_TVAL_SET_UNDEFINED(&tv); /* default value */ + } + + if (arr_idx != DUK__NO_ARRAY_INDEX && DUK_HOBJECT_HAS_ARRAY_PART(obj)) { + if (new_flags == DUK_PROPDESC_FLAGS_WEC) { +#if 0 + DUK_DDD(DUK_DDDPRINT("new data property attributes match array defaults, attempt to write to array part")); + /* may become sparse...*/ +#endif + /* XXX: handling for array part missing now; this doesn't affect + * compliance but causes array entry writes using defineProperty() + * to always abandon array part. + */ + } + DUK_DDD(DUK_DDDPRINT("new data property cannot go to array part, abandon array")); + duk__abandon_array_checked(thr, obj); + /* fall through */ + } + + /* write to entry part */ + e_idx = duk__hobject_alloc_entry_checked(thr, obj, key); + DUK_ASSERT(e_idx >= 0); + tv2 = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, e_idx); + DUK_TVAL_SET_TVAL(tv2, &tv); + DUK_TVAL_INCREF(thr, tv2); + + DUK_HOBJECT_E_SET_FLAGS(thr->heap, obj, e_idx, new_flags); + goto success_exotics; + } + DUK_UNREACHABLE(); + } + + /* we currently assume virtual properties are not configurable (as none of them are) */ + DUK_ASSERT((curr.e_idx >= 0 || curr.a_idx >= 0) || !(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE)); + + /* [obj key desc value get set curr_value] */ + + /* + * Property already exists. Steps 5-6 detect whether any changes need + * to be made. + */ + + if (has_enumerable) { + if (is_enumerable) { + if (!(curr.flags & DUK_PROPDESC_FLAG_ENUMERABLE)) { + goto need_check; + } + } else { + if (curr.flags & DUK_PROPDESC_FLAG_ENUMERABLE) { + goto need_check; + } + } + } + if (has_configurable) { + if (is_configurable) { + if (!(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE)) { + goto need_check; + } + } else { + if (curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) { + goto need_check; + } + } + } + if (has_value) { + duk_tval *tmp1; + duk_tval *tmp2; + + /* attempt to change from accessor to data property */ + if (curr.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + goto need_check; + } + + tmp1 = duk_require_tval(thr, -1); /* curr value */ + tmp2 = duk_require_tval(thr, idx_value); /* new value */ + if (!duk_js_samevalue(tmp1, tmp2)) { + goto need_check; + } + } + if (has_writable) { + /* attempt to change from accessor to data property */ + if (curr.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + goto need_check; + } + + if (is_writable) { + if (!(curr.flags & DUK_PROPDESC_FLAG_WRITABLE)) { + goto need_check; + } + } else { + if (curr.flags & DUK_PROPDESC_FLAG_WRITABLE) { + goto need_check; + } + } + } + if (has_set) { + if (curr.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + if (set != curr.set) { + goto need_check; + } + } else { + goto need_check; + } + } + if (has_get) { + if (curr.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + if (get != curr.get) { + goto need_check; + } + } else { + goto need_check; + } + } + + /* property exists, either 'desc' is empty, or all values + * match (SameValue) + */ + goto success_no_exotics; + + need_check: + + /* + * Some change(s) need to be made. Steps 7-11. + */ + + /* shared checks for all descriptor types */ + if (!(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && !force_flag) { + if (has_configurable && is_configurable) { + goto fail_not_configurable; + } + if (has_enumerable) { + if (curr.flags & DUK_PROPDESC_FLAG_ENUMERABLE) { + if (!is_enumerable) { + goto fail_not_configurable; + } + } else { + if (is_enumerable) { + goto fail_not_configurable; + } + } + } + } + + /* Virtual properties don't have backing so they can't mostly be + * edited. Some virtual properties are, however, writable: for + * example, virtual index properties of buffer objects and Array + * instance .length. These are not configurable so the checks + * above mostly cover attempts to change them, except when the + * duk_def_prop() call is used with DUK_DEFPROP_FORCE; even in + * that case we can't forcibly change the property attributes + * because they don't have concrete backing. + */ + + /* XXX: for ROM objects too it'd be best if value modify was + * allowed if the value matches SameValue. + */ + /* Reject attempt to change a read-only object. */ +#if defined(DUK_USE_ROM_OBJECTS) + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) { + DUK_DD(DUK_DDPRINT("attempt to define property on read-only target object")); + goto fail_not_configurable; + } +#endif + + /* descriptor type specific checks */ + if (has_set || has_get) { + /* IsAccessorDescriptor(desc) == true */ + DUK_ASSERT(!has_writable); + DUK_ASSERT(!has_value); + + if (curr.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + /* curr and desc are accessors */ + if (!(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && !force_flag) { + if (has_set && set != curr.set) { + goto fail_not_configurable; + } + if (has_get && get != curr.get) { + goto fail_not_configurable; + } + } + } else { + duk_bool_t rc; + duk_tval *tv1; + + /* curr is data, desc is accessor */ + if (!(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && !force_flag) { + goto fail_not_configurable; + } + + DUK_DDD(DUK_DDDPRINT("convert property to accessor property")); + if (curr.a_idx >= 0) { + DUK_DDD(DUK_DDDPRINT("property to convert is stored in an array entry, abandon array and re-lookup")); + duk__abandon_array_checked(thr, obj); + duk_pop_unsafe(thr); /* remove old value */ + rc = duk__get_own_propdesc_raw(thr, obj, key, arr_idx, &curr, DUK_GETDESC_FLAG_PUSH_VALUE); + DUK_UNREF(rc); + DUK_ASSERT(rc != 0); + DUK_ASSERT(curr.e_idx >= 0 && curr.a_idx < 0); + } + if (curr.e_idx < 0) { + DUK_ASSERT(curr.a_idx < 0 && curr.e_idx < 0); + goto fail_virtual; /* safeguard for virtual property */ + } + + DUK_ASSERT(curr.e_idx >= 0); + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, curr.e_idx)); + + tv1 = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, curr.e_idx); + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, tv1); /* XXX: just decref */ + + DUK_HOBJECT_E_SET_VALUE_GETTER(thr->heap, obj, curr.e_idx, NULL); + DUK_HOBJECT_E_SET_VALUE_SETTER(thr->heap, obj, curr.e_idx, NULL); + DUK_HOBJECT_E_SLOT_CLEAR_WRITABLE(thr->heap, obj, curr.e_idx); + DUK_HOBJECT_E_SLOT_SET_ACCESSOR(thr->heap, obj, curr.e_idx); + + DUK_DDD(DUK_DDDPRINT("flags after data->accessor conversion: 0x%02lx", + (unsigned long) DUK_HOBJECT_E_GET_FLAGS(thr->heap, obj, curr.e_idx))); + /* Update curr.flags; faster than a re-lookup. */ + curr.flags &= ~DUK_PROPDESC_FLAG_WRITABLE; + curr.flags |= DUK_PROPDESC_FLAG_ACCESSOR; + } + } else if (has_value || has_writable) { + /* IsDataDescriptor(desc) == true */ + DUK_ASSERT(!has_set); + DUK_ASSERT(!has_get); + + if (curr.flags & DUK_PROPDESC_FLAG_ACCESSOR) { + duk_hobject *tmp; + + /* curr is accessor, desc is data */ + if (!(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && !force_flag) { + goto fail_not_configurable; + } + + /* curr is accessor -> cannot be in array part. */ + DUK_ASSERT(curr.a_idx < 0); + if (curr.e_idx < 0) { + goto fail_virtual; /* safeguard; no virtual accessors now */ + } + + DUK_DDD(DUK_DDDPRINT("convert property to data property")); + + DUK_ASSERT(DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, curr.e_idx)); + tmp = DUK_HOBJECT_E_GET_VALUE_GETTER(thr->heap, obj, curr.e_idx); + DUK_UNREF(tmp); + DUK_HOBJECT_E_SET_VALUE_GETTER(thr->heap, obj, curr.e_idx, NULL); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, tmp); + tmp = DUK_HOBJECT_E_GET_VALUE_SETTER(thr->heap, obj, curr.e_idx); + DUK_UNREF(tmp); + DUK_HOBJECT_E_SET_VALUE_SETTER(thr->heap, obj, curr.e_idx, NULL); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, tmp); + + DUK_TVAL_SET_UNDEFINED(DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, curr.e_idx)); + DUK_HOBJECT_E_SLOT_CLEAR_WRITABLE(thr->heap, obj, curr.e_idx); + DUK_HOBJECT_E_SLOT_CLEAR_ACCESSOR(thr->heap, obj, curr.e_idx); + + DUK_DDD(DUK_DDDPRINT("flags after accessor->data conversion: 0x%02lx", + (unsigned long) DUK_HOBJECT_E_GET_FLAGS(thr->heap, obj, curr.e_idx))); + + /* Update curr.flags; faster than a re-lookup. */ + curr.flags &= ~(DUK_PROPDESC_FLAG_WRITABLE | DUK_PROPDESC_FLAG_ACCESSOR); + } else { + /* curr and desc are data */ + if (!(curr.flags & DUK_PROPDESC_FLAG_CONFIGURABLE) && !force_flag) { + if (!(curr.flags & DUK_PROPDESC_FLAG_WRITABLE) && has_writable && is_writable) { + goto fail_not_configurable; + } + /* Note: changing from writable to non-writable is OK */ + if (!(curr.flags & DUK_PROPDESC_FLAG_WRITABLE) && has_value) { + duk_tval *tmp1 = duk_require_tval(thr, -1); /* curr value */ + duk_tval *tmp2 = duk_require_tval(thr, idx_value); /* new value */ + if (!duk_js_samevalue(tmp1, tmp2)) { + goto fail_not_configurable; + } + } + } + } + } else { + /* IsGenericDescriptor(desc) == true; this means in practice that 'desc' + * only has [[Enumerable]] or [[Configurable]] flag updates, which are + * allowed at this point. + */ + + DUK_ASSERT(!has_value && !has_writable && !has_get && !has_set); + } + + /* + * Start doing property attributes updates. Steps 12-13. + * + * Start by computing new attribute flags without writing yet. + * Property type conversion is done above if necessary. + */ + + new_flags = curr.flags; + + if (has_enumerable) { + if (is_enumerable) { + new_flags |= DUK_PROPDESC_FLAG_ENUMERABLE; + } else { + new_flags &= ~DUK_PROPDESC_FLAG_ENUMERABLE; + } + } + if (has_configurable) { + if (is_configurable) { + new_flags |= DUK_PROPDESC_FLAG_CONFIGURABLE; + } else { + new_flags &= ~DUK_PROPDESC_FLAG_CONFIGURABLE; + } + } + if (has_writable) { + if (is_writable) { + new_flags |= DUK_PROPDESC_FLAG_WRITABLE; + } else { + new_flags &= ~DUK_PROPDESC_FLAG_WRITABLE; + } + } + + /* XXX: write protect after flag? -> any chance of handling it here? */ + + DUK_DDD(DUK_DDDPRINT("new flags that we want to write: 0x%02lx", + (unsigned long) new_flags)); + + /* + * Check whether we need to abandon an array part (if it exists) + */ + + if (curr.a_idx >= 0) { + duk_bool_t rc; + + DUK_ASSERT(curr.e_idx < 0); + + if (new_flags == DUK_PROPDESC_FLAGS_WEC) { + duk_tval *tv1, *tv2; + + DUK_DDD(DUK_DDDPRINT("array index, new property attributes match array defaults, update in-place")); + + DUK_ASSERT(curr.flags == DUK_PROPDESC_FLAGS_WEC); /* must have been, since in array part */ + DUK_ASSERT(!has_set); + DUK_ASSERT(!has_get); + DUK_ASSERT(idx_value >= 0); /* must be: if attributes match and we get here the value must differ (otherwise no change) */ + + tv2 = duk_require_tval(thr, idx_value); + tv1 = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, curr.a_idx); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects; may invalidate a_idx */ + goto success_exotics; + } + + DUK_DDD(DUK_DDDPRINT("array index, new property attributes do not match array defaults, abandon array and re-lookup")); + duk__abandon_array_checked(thr, obj); + duk_pop_unsafe(thr); /* remove old value */ + rc = duk__get_own_propdesc_raw(thr, obj, key, arr_idx, &curr, DUK_GETDESC_FLAG_PUSH_VALUE); + DUK_UNREF(rc); + DUK_ASSERT(rc != 0); + DUK_ASSERT(curr.e_idx >= 0 && curr.a_idx < 0); + } + + DUK_DDD(DUK_DDDPRINT("updating existing property in entry part")); + + /* Array case is handled comprehensively above: either in entry + * part or a virtual property. + */ + DUK_ASSERT(curr.a_idx < 0); + + DUK_DDD(DUK_DDDPRINT("update existing property attributes")); + if (curr.e_idx >= 0) { + DUK_HOBJECT_E_SET_FLAGS(thr->heap, obj, curr.e_idx, new_flags); + } else { + /* For Array .length the only allowed transition is for .length + * to become non-writable. + */ + if (key == DUK_HTHREAD_STRING_LENGTH(thr) && DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + duk_harray *a; + a = (duk_harray *) obj; + DUK_DD(DUK_DDPRINT("Object.defineProperty() attribute update for duk_harray .length -> %02lx", (unsigned long) new_flags)); + DUK_ASSERT_HARRAY_VALID(a); + if ((new_flags & DUK_PROPDESC_FLAGS_EC) != (curr.flags & DUK_PROPDESC_FLAGS_EC)) { + DUK_D(DUK_DPRINT("Object.defineProperty() attempt to change virtual array .length enumerable or configurable attribute, fail")); + goto fail_virtual; + } + if (new_flags & DUK_PROPDESC_FLAG_WRITABLE) { + DUK_HARRAY_SET_LENGTH_WRITABLE(a); + } else { + DUK_HARRAY_SET_LENGTH_NONWRITABLE(a); + } + } + } + + if (has_set) { + duk_hobject *tmp; + + /* Virtual properties are non-configurable but with a 'force' + * flag we might come here so check explicitly for virtual. + */ + if (curr.e_idx < 0) { + goto fail_virtual; + } + + DUK_DDD(DUK_DDDPRINT("update existing property setter")); + DUK_ASSERT(DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, curr.e_idx)); + + tmp = DUK_HOBJECT_E_GET_VALUE_SETTER(thr->heap, obj, curr.e_idx); + DUK_UNREF(tmp); + DUK_HOBJECT_E_SET_VALUE_SETTER(thr->heap, obj, curr.e_idx, set); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, set); + DUK_HOBJECT_DECREF_ALLOWNULL(thr, tmp); /* side effects; may invalidate e_idx */ + } + if (has_get) { + duk_hobject *tmp; + + if (curr.e_idx < 0) { + goto fail_virtual; + } + + DUK_DDD(DUK_DDDPRINT("update existing property getter")); + DUK_ASSERT(DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, curr.e_idx)); + + tmp = DUK_HOBJECT_E_GET_VALUE_GETTER(thr->heap, obj, curr.e_idx); + DUK_UNREF(tmp); + DUK_HOBJECT_E_SET_VALUE_GETTER(thr->heap, obj, curr.e_idx, get); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, get); + DUK_HOBJECT_DECREF_ALLOWNULL(thr, tmp); /* side effects; may invalidate e_idx */ + } + if (has_value) { + duk_tval *tv1, *tv2; + + DUK_DDD(DUK_DDDPRINT("update existing property value")); + + if (curr.e_idx >= 0) { + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, obj, curr.e_idx)); + tv2 = duk_require_tval(thr, idx_value); + tv1 = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, obj, curr.e_idx); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects; may invalidate e_idx */ + } else { + DUK_ASSERT(curr.a_idx < 0); /* array part case handled comprehensively previously */ + + DUK_DD(DUK_DDPRINT("Object.defineProperty(), value update for virtual property")); + /* XXX: Uint8Array and other typed array virtual writes not currently + * handled. + */ + if (key == DUK_HTHREAD_STRING_LENGTH(thr) && DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + duk_harray *a; + a = (duk_harray *) obj; + DUK_DD(DUK_DDPRINT("Object.defineProperty() value update for duk_harray .length -> %ld", (long) arrlen_new_len)); + DUK_ASSERT_HARRAY_VALID(a); + a->length = arrlen_new_len; + } else { + goto fail_virtual; /* should not happen */ + } + } + } + + /* + * Standard algorithm succeeded without errors, check for exotic post-behaviors. + * + * Arguments exotic behavior in E5 Section 10.6 occurs after the standard + * [[DefineOwnProperty]] has completed successfully. + * + * Array exotic behavior in E5 Section 15.4.5.1 is implemented partly + * prior to the default [[DefineOwnProperty]], but: + * - for an array index key (e.g. "10") the final 'length' update occurs here + * - for 'length' key the element deletion and 'length' update occurs here + */ + + success_exotics: + + /* curr.a_idx or curr.e_idx may have been invalidated by side effects + * above. + */ + + /* [obj key desc value get set curr_value] */ + + if (DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)) { + duk_harray *a; + + a = (duk_harray *) obj; + DUK_ASSERT_HARRAY_VALID(a); + + if (arridx_new_array_length > 0) { + /* + * Note: zero works as a "no update" marker because the new length + * can never be zero after a new property is written. + */ + + /* E5 Section 15.4.5.1, steps 4.e.i - 4.e.ii */ + + DUK_DDD(DUK_DDDPRINT("defineProperty successful, pending array length update to: %ld", + (long) arridx_new_array_length)); + + a->length = arridx_new_array_length; + } + + if (key == DUK_HTHREAD_STRING_LENGTH(thr) && arrlen_new_len < arrlen_old_len) { + /* + * E5 Section 15.4.5.1, steps 3.k - 3.n. The order at the end combines + * the error case 3.l.iii and the success case 3.m-3.n. + */ + + /* XXX: investigate whether write protect can be handled above, if we + * just update length here while ignoring its protected status + */ + + duk_uint32_t result_len; + duk_bool_t rc; + + DUK_DDD(DUK_DDDPRINT("defineProperty successful, key is 'length', exotic array behavior, " + "doing array element deletion and length update")); + + rc = duk__handle_put_array_length_smaller(thr, obj, arrlen_old_len, arrlen_new_len, force_flag, &result_len); + + /* update length (curr points to length, and we assume it's still valid) */ + DUK_ASSERT(result_len >= arrlen_new_len && result_len <= arrlen_old_len); + + a->length = result_len; + + if (pending_write_protect) { + DUK_DDD(DUK_DDDPRINT("setting array length non-writable (pending writability update)")); + DUK_HARRAY_SET_LENGTH_NONWRITABLE(a); + } + + /* XXX: shrink array allocation or entries compaction here? */ + if (!rc) { + DUK_DD(DUK_DDPRINT("array length write only partially successful")); + goto fail_not_configurable; + } + } + } else if (arr_idx != DUK__NO_ARRAY_INDEX && DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(obj)) { + duk_hobject *map; + duk_hobject *varenv; + + DUK_ASSERT(arridx_new_array_length == 0); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARRAY(obj)); /* traits are separate; in particular, arguments not an array */ + + map = NULL; + varenv = NULL; + if (!duk__lookup_arguments_map(thr, obj, key, &curr, &map, &varenv)) { + goto success_no_exotics; + } + DUK_ASSERT(map != NULL); + DUK_ASSERT(varenv != NULL); + + /* [obj key desc value get set curr_value varname] */ + + if (has_set || has_get) { + /* = IsAccessorDescriptor(Desc) */ + DUK_DDD(DUK_DDDPRINT("defineProperty successful, key mapped to arguments 'map' " + "changed to an accessor, delete arguments binding")); + + (void) duk_hobject_delprop_raw(thr, map, key, 0); /* ignore result */ + } else { + /* Note: this order matters (final value before deleting map entry must be done) */ + DUK_DDD(DUK_DDDPRINT("defineProperty successful, key mapped to arguments 'map', " + "check for value update / binding deletion")); + + if (has_value) { + duk_hstring *varname; + + DUK_DDD(DUK_DDDPRINT("defineProperty successful, key mapped to arguments 'map', " + "update bound value (variable/argument)")); + + varname = duk_require_hstring(thr, -1); + DUK_ASSERT(varname != NULL); + + DUK_DDD(DUK_DDDPRINT("arguments object automatic putvar for a bound variable; " + "key=%!O, varname=%!O, value=%!T", + (duk_heaphdr *) key, + (duk_heaphdr *) varname, + (duk_tval *) duk_require_tval(thr, idx_value))); + + /* strict flag for putvar comes from our caller (currently: fixed) */ + duk_js_putvar_envrec(thr, varenv, varname, duk_require_tval(thr, idx_value), 1 /*throw_flag*/); + } + if (has_writable && !is_writable) { + DUK_DDD(DUK_DDDPRINT("defineProperty successful, key mapped to arguments 'map', " + "changed to non-writable, delete arguments binding")); + + (void) duk_hobject_delprop_raw(thr, map, key, 0); /* ignore result */ + } + } + + /* 'varname' is in stack in this else branch, leaving an unbalanced stack below, + * but this doesn't matter now. + */ + } + + success_no_exotics: + /* Some code paths use NORZ macros for simplicity, ensure refzero + * handling is completed. + */ + DUK_REFZERO_CHECK_SLOW(thr); + return 1; + + fail_not_extensible: + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_EXTENSIBLE); + DUK_WO_NORETURN(return 0;); + } + return 0; + + fail_virtual: /* just use the same "not configurable" error message" */ + fail_not_configurable: + if (throw_flag) { + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); + DUK_WO_NORETURN(return 0;); + } + return 0; +} + +/* + * Object.prototype.hasOwnProperty() and Object.prototype.propertyIsEnumerable(). + */ + +DUK_INTERNAL duk_bool_t duk_hobject_object_ownprop_helper(duk_hthread *thr, duk_small_uint_t required_desc_flags) { + duk_hstring *h_v; + duk_hobject *h_obj; + duk_propdesc desc; + duk_bool_t ret; + + /* coercion order matters */ + h_v = duk_to_hstring_acceptsymbol(thr, 0); + DUK_ASSERT(h_v != NULL); + + h_obj = duk_push_this_coercible_to_object(thr); + DUK_ASSERT(h_obj != NULL); + + ret = duk_hobject_get_own_propdesc(thr, h_obj, h_v, &desc, 0 /*flags*/); /* don't push value */ + + duk_push_boolean(thr, ret && ((desc.flags & required_desc_flags) == required_desc_flags)); + return 1; +} + +/* + * Object.seal() and Object.freeze() (E5 Sections 15.2.3.8 and 15.2.3.9) + * + * Since the algorithms are similar, a helper provides both functions. + * Freezing is essentially sealing + making plain properties non-writable. + * + * Note: virtual (non-concrete) properties which are non-configurable but + * writable would pose some problems, but such properties do not currently + * exist (all virtual properties are non-configurable and non-writable). + * If they did exist, the non-configurability does NOT prevent them from + * becoming non-writable. However, this change should be recorded somehow + * so that it would turn up (e.g. when getting the property descriptor), + * requiring some additional flags in the object. + */ + +DUK_INTERNAL void duk_hobject_object_seal_freeze_helper(duk_hthread *thr, duk_hobject *obj, duk_bool_t is_freeze) { + duk_uint_fast32_t i; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(obj != NULL); + + DUK_ASSERT_VALSTACK_SPACE(thr, DUK__VALSTACK_SPACE); + +#if defined(DUK_USE_ROM_OBJECTS) + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) { + DUK_DD(DUK_DDPRINT("attempt to seal/freeze a readonly object, reject")); + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); + DUK_WO_NORETURN(return;); + } +#endif + + /* + * Abandon array part because all properties must become non-configurable. + * Note that this is now done regardless of whether this is always the case + * (skips check, but performance problem if caller would do this many times + * for the same object; not likely). + */ + + duk__abandon_array_checked(thr, obj); + DUK_ASSERT(DUK_HOBJECT_GET_ASIZE(obj) == 0); + + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + duk_uint8_t *fp; + + /* since duk__abandon_array_checked() causes a resize, there should be no gaps in keys */ + DUK_ASSERT(DUK_HOBJECT_E_GET_KEY(thr->heap, obj, i) != NULL); + + /* avoid multiple computations of flags address; bypasses macros */ + fp = DUK_HOBJECT_E_GET_FLAGS_PTR(thr->heap, obj, i); + if (is_freeze && !((*fp) & DUK_PROPDESC_FLAG_ACCESSOR)) { + *fp &= ~(DUK_PROPDESC_FLAG_WRITABLE | DUK_PROPDESC_FLAG_CONFIGURABLE); + } else { + *fp &= ~DUK_PROPDESC_FLAG_CONFIGURABLE; + } + } + + DUK_HOBJECT_CLEAR_EXTENSIBLE(obj); + + /* no need to compact since we already did that in duk__abandon_array_checked() + * (regardless of whether an array part existed or not. + */ + + return; +} + +/* + * Object.isSealed() and Object.isFrozen() (E5 Sections 15.2.3.11, 15.2.3.13) + * + * Since the algorithms are similar, a helper provides both functions. + * Freezing is essentially sealing + making plain properties non-writable. + * + * Note: all virtual (non-concrete) properties are currently non-configurable + * and non-writable (and there are no accessor virtual properties), so they don't + * need to be considered here now. + */ + +DUK_INTERNAL duk_bool_t duk_hobject_object_is_sealed_frozen_helper(duk_hthread *thr, duk_hobject *obj, duk_bool_t is_frozen) { + duk_uint_fast32_t i; + + DUK_ASSERT(obj != NULL); + DUK_UNREF(thr); + + /* Note: no allocation pressure, no need to check refcounts etc */ + + /* must not be extensible */ + if (DUK_HOBJECT_HAS_EXTENSIBLE(obj)) { + return 0; + } + + /* all virtual properties are non-configurable and non-writable */ + + /* entry part must not contain any configurable properties, or + * writable properties (if is_frozen). + */ + for (i = 0; i < DUK_HOBJECT_GET_ENEXT(obj); i++) { + duk_small_uint_t flags; + + if (!DUK_HOBJECT_E_GET_KEY(thr->heap, obj, i)) { + continue; + } + + /* avoid multiple computations of flags address; bypasses macros */ + flags = (duk_small_uint_t) DUK_HOBJECT_E_GET_FLAGS(thr->heap, obj, i); + + if (flags & DUK_PROPDESC_FLAG_CONFIGURABLE) { + return 0; + } + if (is_frozen && + !(flags & DUK_PROPDESC_FLAG_ACCESSOR) && + (flags & DUK_PROPDESC_FLAG_WRITABLE)) { + return 0; + } + } + + /* array part must not contain any non-unused properties, as they would + * be configurable and writable. + */ + for (i = 0; i < DUK_HOBJECT_GET_ASIZE(obj); i++) { + duk_tval *tv = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, obj, i); + if (!DUK_TVAL_IS_UNUSED(tv)) { + return 0; + } + } + + return 1; +} + +/* + * Object.preventExtensions() and Object.isExtensible() (E5 Sections 15.2.3.10, 15.2.3.13) + * + * Not needed, implemented by macros DUK_HOBJECT_{HAS,CLEAR,SET}_EXTENSIBLE + * and the Object built-in bindings. + */ + +/* automatic undefs */ +#undef DUK__HASH_DELETED +#undef DUK__HASH_UNUSED +#undef DUK__NO_ARRAY_INDEX +#undef DUK__VALSTACK_PROXY_LOOKUP +#undef DUK__VALSTACK_SPACE +#line 1 "duk_hstring_misc.c" +/* + * Misc support functions + */ + +/* #include duk_internal.h -> already included */ + +/* + * duk_hstring charCodeAt, with and without surrogate awareness + */ + +DUK_INTERNAL duk_ucodepoint_t duk_hstring_char_code_at_raw(duk_hthread *thr, duk_hstring *h, duk_uint_t pos, duk_bool_t surrogate_aware) { + duk_uint32_t boff; + const duk_uint8_t *p, *p_start, *p_end; + duk_ucodepoint_t cp1; + duk_ucodepoint_t cp2; + + /* Caller must check character offset to be inside the string. */ + DUK_ASSERT(thr != NULL); + DUK_ASSERT(h != NULL); + DUK_ASSERT_DISABLE(pos >= 0); /* unsigned */ + DUK_ASSERT(pos < (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h)); + + boff = (duk_uint32_t) duk_heap_strcache_offset_char2byte(thr, h, (duk_uint32_t) pos); + DUK_DDD(DUK_DDDPRINT("charCodeAt: pos=%ld -> boff=%ld, str=%!O", + (long) pos, (long) boff, (duk_heaphdr *) h)); + DUK_ASSERT_DISABLE(boff >= 0); + DUK_ASSERT(boff < DUK_HSTRING_GET_BYTELEN(h)); + + p_start = DUK_HSTRING_GET_DATA(h); + p_end = p_start + DUK_HSTRING_GET_BYTELEN(h); + p = p_start + boff; + DUK_DDD(DUK_DDDPRINT("p_start=%p, p_end=%p, p=%p", + (const void *) p_start, (const void *) p_end, + (const void *) p)); + + /* For invalid UTF-8 (never happens for standard ECMAScript strings) + * return U+FFFD replacement character. + */ + if (duk_unicode_decode_xutf8(thr, &p, p_start, p_end, &cp1)) { + if (surrogate_aware && cp1 >= 0xd800UL && cp1 <= 0xdbffUL) { + /* The decode helper is memory safe even if 'cp1' was + * decoded at the end of the string and 'p' is no longer + * within string memory range. + */ + cp2 = 0; /* If call fails, this is left untouched and won't match cp2 check. */ + (void) duk_unicode_decode_xutf8(thr, &p, p_start, p_end, &cp2); + if (cp2 >= 0xdc00UL && cp2 <= 0xdfffUL) { + cp1 = (duk_ucodepoint_t) (((cp1 - 0xd800UL) << 10) + (cp2 - 0xdc00UL) + 0x10000UL); + } + } + } else { + cp1 = DUK_UNICODE_CP_REPLACEMENT_CHARACTER; + } + + return cp1; +} + +/* + * duk_hstring charlen, when lazy charlen disabled + */ + +#if !defined(DUK_USE_HSTRING_LAZY_CLEN) +#if !defined(DUK_USE_HSTRING_CLEN) +#error non-lazy duk_hstring charlen but DUK_USE_HSTRING_CLEN not set +#endif +DUK_INTERNAL void duk_hstring_init_charlen(duk_hstring *h) { + duk_uint32_t clen; + + DUK_ASSERT(h != NULL); + DUK_ASSERT(!DUK_HSTRING_HAS_ASCII(h)); + DUK_ASSERT(!DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)); + + clen = duk_unicode_unvalidated_utf8_length(DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); +#if defined(DUK_USE_STRLEN16) + DUK_ASSERT(clen <= 0xffffUL); /* Bytelength checked during interning. */ + h->clen16 = (duk_uint16_t) clen; +#else + h->clen = (duk_uint32_t) clen; +#endif + if (DUK_LIKELY(clen == DUK_HSTRING_GET_BYTELEN(h))) { + DUK_HSTRING_SET_ASCII(h); + } +} + +DUK_INTERNAL DUK_HOT duk_size_t duk_hstring_get_charlen(duk_hstring *h) { +#if defined(DUK_USE_STRLEN16) + return h->clen16; +#else + return h->clen; +#endif +} +#endif /* !DUK_USE_HSTRING_LAZY_CLEN */ + +/* + * duk_hstring charlen, when lazy charlen enabled + */ + +#if defined(DUK_USE_HSTRING_LAZY_CLEN) +#if defined(DUK_USE_HSTRING_CLEN) +DUK_LOCAL DUK_COLD duk_size_t duk__hstring_get_charlen_slowpath(duk_hstring *h) { + duk_size_t res; + + DUK_ASSERT(h->clen == 0); /* Checked by caller. */ + +#if defined(DUK_USE_ROM_STRINGS) + /* ROM strings have precomputed clen, but if the computed clen is zero + * we can still come here and can't write anything. + */ + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)) { + return 0; + } +#endif + + res = duk_unicode_unvalidated_utf8_length(DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); +#if defined(DUK_USE_STRLEN16) + DUK_ASSERT(res <= 0xffffUL); /* Bytelength checked during interning. */ + h->clen16 = (duk_uint16_t) res; +#else + h->clen = (duk_uint32_t) res; +#endif + if (DUK_LIKELY(res == DUK_HSTRING_GET_BYTELEN(h))) { + DUK_HSTRING_SET_ASCII(h); + } + return res; +} +#else /* DUK_USE_HSTRING_CLEN */ +DUK_LOCAL duk_size_t duk__hstring_get_charlen_slowpath(duk_hstring *h) { + if (DUK_LIKELY(DUK_HSTRING_HAS_ASCII(h))) { + /* Most practical strings will go here. */ + return DUK_HSTRING_GET_BYTELEN(h); + } else { + /* ASCII flag is lazy, so set it here. */ + duk_size_t res; + + /* XXX: here we could use the strcache to speed up the + * computation (matters for 'i < str.length' loops). + */ + + res = duk_unicode_unvalidated_utf8_length(DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); + +#if defined(DUK_USE_ROM_STRINGS) + if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) h)) { + /* For ROM strings, can't write anything; ASCII flag + * is preset so we don't need to update it. + */ + return res; + } +#endif + if (DUK_LIKELY(res == DUK_HSTRING_GET_BYTELEN(h))) { + DUK_HSTRING_SET_ASCII(h); + } + return res; + } +} +#endif /* DUK_USE_HSTRING_CLEN */ + +#if defined(DUK_USE_HSTRING_CLEN) +DUK_INTERNAL DUK_HOT duk_size_t duk_hstring_get_charlen(duk_hstring *h) { +#if defined(DUK_USE_STRLEN16) + if (DUK_LIKELY(h->clen16 != 0)) { + return h->clen16; + } +#else + if (DUK_LIKELY(h->clen != 0)) { + return h->clen; + } +#endif + return duk__hstring_get_charlen_slowpath(h); +} +#else /* DUK_USE_HSTRING_CLEN */ +DUK_INTERNAL DUK_HOT duk_size_t duk_hstring_get_charlen(duk_hstring *h) { + /* Always use slow path. */ + return duk__hstring_get_charlen_slowpath(h); +} +#endif /* DUK_USE_HSTRING_CLEN */ +#endif /* DUK_USE_HSTRING_LAZY_CLEN */ + +/* + * Compare duk_hstring to an ASCII cstring. + */ + +DUK_INTERNAL duk_bool_t duk_hstring_equals_ascii_cstring(duk_hstring *h, const char *cstr) { + duk_size_t len; + + DUK_ASSERT(h != NULL); + DUK_ASSERT(cstr != NULL); + + len = DUK_STRLEN(cstr); + if (len != DUK_HSTRING_GET_BYTELEN(h)) { + return 0; + } + if (duk_memcmp((const void *) cstr, (const void *) DUK_HSTRING_GET_DATA(h), len) == 0) { + return 1; + } + return 0; +} +#line 1 "duk_hthread_alloc.c" +/* + * duk_hthread allocation and freeing. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Allocate initial stacks for a thread. Note that 'thr' must be reachable + * as a garbage collection may be triggered by the allocation attempts. + * Returns zero (without leaking memory) if init fails. + */ + +DUK_INTERNAL duk_bool_t duk_hthread_init_stacks(duk_heap *heap, duk_hthread *thr) { + duk_size_t alloc_size; + duk_size_t i; + + DUK_ASSERT(heap != NULL); + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->valstack == NULL); + DUK_ASSERT(thr->valstack_end == NULL); + DUK_ASSERT(thr->valstack_alloc_end == NULL); + DUK_ASSERT(thr->valstack_bottom == NULL); + DUK_ASSERT(thr->valstack_top == NULL); + DUK_ASSERT(thr->callstack_curr == NULL); + + /* valstack */ + DUK_ASSERT(DUK_VALSTACK_API_ENTRY_MINIMUM <= DUK_VALSTACK_INITIAL_SIZE); + alloc_size = sizeof(duk_tval) * DUK_VALSTACK_INITIAL_SIZE; + thr->valstack = (duk_tval *) DUK_ALLOC(heap, alloc_size); + if (!thr->valstack) { + goto fail; + } + duk_memzero(thr->valstack, alloc_size); + thr->valstack_end = thr->valstack + DUK_VALSTACK_API_ENTRY_MINIMUM; + thr->valstack_alloc_end = thr->valstack + DUK_VALSTACK_INITIAL_SIZE; + thr->valstack_bottom = thr->valstack; + thr->valstack_top = thr->valstack; + + for (i = 0; i < DUK_VALSTACK_INITIAL_SIZE; i++) { + DUK_TVAL_SET_UNDEFINED(&thr->valstack[i]); + } + + return 1; + + fail: + DUK_FREE(heap, thr->valstack); + DUK_ASSERT(thr->callstack_curr == NULL); + + thr->valstack = NULL; + return 0; +} + +/* For indirect allocs. */ + +DUK_INTERNAL void *duk_hthread_get_valstack_ptr(duk_heap *heap, void *ud) { + duk_hthread *thr = (duk_hthread *) ud; + DUK_UNREF(heap); + return (void *) thr->valstack; +} +#line 1 "duk_hthread_builtins.c" +/* + * Initialize built-in objects. Current thread must have a valstack + * and initialization errors may longjmp, so a setjmp() catch point + * must exist. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Encoding constants, must match genbuiltins.py + */ + +#define DUK__PROP_FLAGS_BITS 3 +#define DUK__LENGTH_PROP_BITS 3 +#define DUK__NARGS_BITS 3 +#define DUK__PROP_TYPE_BITS 3 + +#define DUK__NARGS_VARARGS_MARKER 0x07 + +#define DUK__PROP_TYPE_DOUBLE 0 +#define DUK__PROP_TYPE_STRING 1 +#define DUK__PROP_TYPE_STRIDX 2 +#define DUK__PROP_TYPE_BUILTIN 3 +#define DUK__PROP_TYPE_UNDEFINED 4 +#define DUK__PROP_TYPE_BOOLEAN_TRUE 5 +#define DUK__PROP_TYPE_BOOLEAN_FALSE 6 +#define DUK__PROP_TYPE_ACCESSOR 7 + +/* + * Create built-in objects by parsing an init bitstream generated + * by genbuiltins.py. + */ + +#if defined(DUK_USE_ROM_OBJECTS) +#if defined(DUK_USE_ROM_GLOBAL_CLONE) || defined(DUK_USE_ROM_GLOBAL_INHERIT) +DUK_LOCAL void duk__duplicate_ram_global_object(duk_hthread *thr) { + duk_hobject *h_global; +#if defined(DUK_USE_ROM_GLOBAL_CLONE) + duk_hobject *h_oldglobal; + duk_uint8_t *props; + duk_size_t alloc_size; +#endif + duk_hobject *h_objenv; + + /* XXX: refactor into internal helper, duk_clone_hobject() */ + +#if defined(DUK_USE_ROM_GLOBAL_INHERIT) + /* Inherit from ROM-based global object: less RAM usage, less transparent. */ + h_global = duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_GLOBAL), + DUK_BIDX_GLOBAL); + DUK_ASSERT(h_global != NULL); +#elif defined(DUK_USE_ROM_GLOBAL_CLONE) + /* Clone the properties of the ROM-based global object to create a + * fully RAM-based global object. Uses more memory than the inherit + * model but more compliant. + */ + h_global = duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_GLOBAL), + DUK_BIDX_OBJECT_PROTOTYPE); + DUK_ASSERT(h_global != NULL); + h_oldglobal = thr->builtins[DUK_BIDX_GLOBAL]; + DUK_ASSERT(h_oldglobal != NULL); + + /* Copy the property table verbatim; this handles attributes etc. + * For ROM objects it's not necessary (or possible) to update + * refcounts so leave them as is. + */ + alloc_size = DUK_HOBJECT_P_ALLOC_SIZE(h_oldglobal); + DUK_ASSERT(alloc_size > 0); + props = DUK_ALLOC_CHECKED(thr, alloc_size); + DUK_ASSERT(props != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROPS(thr->heap, h_oldglobal) != NULL); + duk_memcpy((void *) props, (const void *) DUK_HOBJECT_GET_PROPS(thr->heap, h_oldglobal), alloc_size); + + /* XXX: keep property attributes or tweak them here? + * Properties will now be non-configurable even when they're + * normally configurable for the global object. + */ + + DUK_ASSERT(DUK_HOBJECT_GET_PROPS(thr->heap, h_global) == NULL); + DUK_HOBJECT_SET_PROPS(thr->heap, h_global, props); + DUK_HOBJECT_SET_ESIZE(h_global, DUK_HOBJECT_GET_ESIZE(h_oldglobal)); + DUK_HOBJECT_SET_ENEXT(h_global, DUK_HOBJECT_GET_ENEXT(h_oldglobal)); + DUK_HOBJECT_SET_ASIZE(h_global, DUK_HOBJECT_GET_ASIZE(h_oldglobal)); + DUK_HOBJECT_SET_HSIZE(h_global, DUK_HOBJECT_GET_HSIZE(h_oldglobal)); +#else +#error internal error in config defines +#endif + + duk_hobject_compact_props(thr, h_global); + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL); + DUK_ASSERT(!DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE((duk_heaphdr *) thr->builtins[DUK_BIDX_GLOBAL])); /* no need to decref: ROM object */ + thr->builtins[DUK_BIDX_GLOBAL] = h_global; + DUK_HOBJECT_INCREF(thr, h_global); + DUK_D(DUK_DPRINT("duplicated global object: %!O", h_global)); + + /* Create a fresh object environment for the global scope. This is + * needed so that the global scope points to the newly created RAM-based + * global object. + */ + h_objenv = (duk_hobject *) duk_hobjenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJENV)); + DUK_ASSERT(h_objenv != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_objenv) == NULL); + duk_push_hobject(thr, h_objenv); + + DUK_ASSERT(h_global != NULL); + ((duk_hobjenv *) h_objenv)->target = h_global; + DUK_HOBJECT_INCREF(thr, h_global); + DUK_ASSERT(((duk_hobjenv *) h_objenv)->has_this == 0); + + DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL_ENV] != NULL); + DUK_ASSERT(!DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE((duk_heaphdr *) thr->builtins[DUK_BIDX_GLOBAL_ENV])); /* no need to decref: ROM object */ + thr->builtins[DUK_BIDX_GLOBAL_ENV] = h_objenv; + DUK_HOBJECT_INCREF(thr, h_objenv); + DUK_D(DUK_DPRINT("duplicated global env: %!O", h_objenv)); + + DUK_ASSERT_HOBJENV_VALID((duk_hobjenv *) h_objenv); + + duk_pop_2(thr); /* Pop global object and global env. */ +} +#endif /* DUK_USE_ROM_GLOBAL_CLONE || DUK_USE_ROM_GLOBAL_INHERIT */ + +DUK_INTERNAL void duk_hthread_create_builtin_objects(duk_hthread *thr) { + /* Setup builtins from ROM objects. All heaps/threads will share + * the same readonly objects. + */ + duk_small_uint_t i; + + for (i = 0; i < DUK_NUM_BUILTINS; i++) { + duk_hobject *h; + h = (duk_hobject *) DUK_LOSE_CONST(duk_rom_builtins_bidx[i]); + DUK_ASSERT(h != NULL); + thr->builtins[i] = h; + } + +#if defined(DUK_USE_ROM_GLOBAL_CLONE) || defined(DUK_USE_ROM_GLOBAL_INHERIT) + /* By default the global object is read-only which is often much + * more of an issue than having read-only built-in objects (like + * RegExp, Date, etc). Use a RAM-based copy of the global object + * and the global environment object for convenience. + */ + duk__duplicate_ram_global_object(thr); +#endif +} +#else /* DUK_USE_ROM_OBJECTS */ +DUK_LOCAL void duk__push_stridx(duk_hthread *thr, duk_bitdecoder_ctx *bd) { + duk_small_uint_t n; + + n = (duk_small_uint_t) duk_bd_decode_varuint(bd); + DUK_ASSERT_DISABLE(n >= 0); /* unsigned */ + DUK_ASSERT(n < DUK_HEAP_NUM_STRINGS); + duk_push_hstring_stridx(thr, n); +} +DUK_LOCAL void duk__push_string(duk_hthread *thr, duk_bitdecoder_ctx *bd) { + /* XXX: built-ins data could provide a maximum length that is + * actually needed; bitpacked max length is now 256 bytes. + */ + duk_uint8_t tmp[DUK_BD_BITPACKED_STRING_MAXLEN]; + duk_small_uint_t len; + + len = duk_bd_decode_bitpacked_string(bd, tmp); + duk_push_lstring(thr, (const char *) tmp, (duk_size_t) len); +} +DUK_LOCAL void duk__push_stridx_or_string(duk_hthread *thr, duk_bitdecoder_ctx *bd) { + duk_small_uint_t n; + + n = (duk_small_uint_t) duk_bd_decode_varuint(bd); + if (n == 0) { + duk__push_string(thr, bd); + } else { + n--; + DUK_ASSERT(n < DUK_HEAP_NUM_STRINGS); + duk_push_hstring_stridx(thr, n); + } +} +DUK_LOCAL void duk__push_double(duk_hthread *thr, duk_bitdecoder_ctx *bd) { + duk_double_union du; + duk_small_uint_t i; + + for (i = 0; i < 8; i++) { + /* Encoding endianness must match target memory layout, + * build scripts and genbuiltins.py must ensure this. + */ + du.uc[i] = (duk_uint8_t) duk_bd_decode(bd, 8); + } + + duk_push_number(thr, du.d); /* push operation normalizes NaNs */ +} + +DUK_INTERNAL void duk_hthread_create_builtin_objects(duk_hthread *thr) { + duk_bitdecoder_ctx bd_ctx; + duk_bitdecoder_ctx *bd = &bd_ctx; /* convenience */ + duk_hobject *h; + duk_small_uint_t i, j; + + DUK_D(DUK_DPRINT("INITBUILTINS BEGIN: DUK_NUM_BUILTINS=%d, DUK_NUM_BUILTINS_ALL=%d", (int) DUK_NUM_BUILTINS, (int) DUK_NUM_ALL_BUILTINS)); + + duk_memzero(&bd_ctx, sizeof(bd_ctx)); + bd->data = (const duk_uint8_t *) duk_builtins_data; + bd->length = (duk_size_t) DUK_BUILTINS_DATA_LENGTH; + + /* + * First create all built-in bare objects on the empty valstack. + * + * Built-ins in the index range [0,DUK_NUM_BUILTINS-1] have value + * stack indices matching their eventual thr->builtins[] index. + * + * Built-ins in the index range [DUK_NUM_BUILTINS,DUK_NUM_ALL_BUILTINS] + * will exist on the value stack during init but won't be placed + * into thr->builtins[]. These are objects referenced in some way + * from thr->builtins[] roots but which don't need to be indexed by + * Duktape through thr->builtins[] (e.g. user custom objects). + * + * Internal prototypes will be incorrect (NULL) at this stage. + */ + + duk_require_stack(thr, DUK_NUM_ALL_BUILTINS); + + DUK_DD(DUK_DDPRINT("create empty built-ins")); + DUK_ASSERT_TOP(thr, 0); + for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) { + duk_small_uint_t class_num; + duk_small_int_t len = -1; /* must be signed */ + + class_num = (duk_small_uint_t) duk_bd_decode_varuint(bd); + len = (duk_small_int_t) duk_bd_decode_flagged_signed(bd, DUK__LENGTH_PROP_BITS, (duk_int32_t) -1 /*def_value*/); + + if (class_num == DUK_HOBJECT_CLASS_FUNCTION) { + duk_small_uint_t natidx; + duk_small_int_t c_nargs; /* must hold DUK_VARARGS */ + duk_c_function c_func; + duk_int16_t magic; + + DUK_DDD(DUK_DDDPRINT("len=%ld", (long) len)); + DUK_ASSERT(len >= 0); + + natidx = (duk_small_uint_t) duk_bd_decode_varuint(bd); + DUK_ASSERT(natidx != 0); + c_func = duk_bi_native_functions[natidx]; + DUK_ASSERT(c_func != NULL); + + c_nargs = (duk_small_int_t) duk_bd_decode_flagged_signed(bd, DUK__NARGS_BITS, len /*def_value*/); + if (c_nargs == DUK__NARGS_VARARGS_MARKER) { + c_nargs = DUK_VARARGS; + } + + /* XXX: set magic directly here? (it could share the c_nargs arg) */ + (void) duk_push_c_function_builtin(thr, c_func, c_nargs); + h = duk_known_hobject(thr, -1); + + /* Currently all built-in native functions are strict. + * duk_push_c_function() now sets strict flag, so + * assert for it. + */ + DUK_ASSERT(DUK_HOBJECT_HAS_STRICT(h)); + + /* XXX: function properties */ + + duk__push_stridx_or_string(thr, bd); +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + duk_xdef_prop_stridx_short(thr, + -2, + DUK_STRIDX_NAME, + DUK_PROPDESC_FLAGS_C); +#else + duk_pop(thr); /* Not very ideal but good enough for now. */ +#endif + + /* Almost all global level Function objects are constructable + * but not all: Function.prototype is a non-constructable, + * callable Function. + */ + if (duk_bd_decode_flag(bd)) { + DUK_ASSERT(DUK_HOBJECT_HAS_CONSTRUCTABLE(h)); + } else { + DUK_HOBJECT_CLEAR_CONSTRUCTABLE(h); + } + + /* Cast converts magic to 16-bit signed value */ + magic = (duk_int16_t) duk_bd_decode_varuint(bd); + ((duk_hnatfunc *) h)->magic = magic; + } else if (class_num == DUK_HOBJECT_CLASS_ARRAY) { + duk_push_array(thr); + } else if (class_num == DUK_HOBJECT_CLASS_OBJENV) { + duk_hobjenv *env; + duk_hobject *global; + + DUK_ASSERT(i == DUK_BIDX_GLOBAL_ENV); + DUK_ASSERT(DUK_BIDX_GLOBAL_ENV > DUK_BIDX_GLOBAL); + + env = duk_hobjenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJENV)); + DUK_ASSERT(env->target == NULL); + duk_push_hobject(thr, (duk_hobject *) env); + + global = duk_known_hobject(thr, DUK_BIDX_GLOBAL); + DUK_ASSERT(global != NULL); + env->target = global; + DUK_HOBJECT_INCREF(thr, global); + DUK_ASSERT(env->has_this == 0); + + DUK_ASSERT_HOBJENV_VALID(env); + } else { + DUK_ASSERT(class_num != DUK_HOBJECT_CLASS_DECENV); + + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_EXTENSIBLE, + -1); /* no prototype or class yet */ + + } + + h = duk_known_hobject(thr, -1); + DUK_HOBJECT_SET_CLASS_NUMBER(h, class_num); + + if (i < DUK_NUM_BUILTINS) { + thr->builtins[i] = h; + DUK_HOBJECT_INCREF(thr, &h->hdr); + } + + if (len >= 0) { + /* In ES2015+ built-in function object .length property + * has property attributes C (configurable only): + * http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-standard-built-in-objects + * + * Array.prototype remains an Array instance in ES2015+ + * and its length has attributes W (writable only). + * Because .length is now virtual for duk_harray, it is + * not encoded explicitly in init data. + */ + + DUK_ASSERT(class_num != DUK_HOBJECT_CLASS_ARRAY); /* .length is virtual */ + duk_push_int(thr, len); + duk_xdef_prop_stridx_short(thr, + -2, + DUK_STRIDX_LENGTH, + DUK_PROPDESC_FLAGS_C); + } + + /* enable exotic behaviors last */ + + if (class_num == DUK_HOBJECT_CLASS_ARRAY) { + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(h)); /* set by duk_push_array() */ + } + if (class_num == DUK_HOBJECT_CLASS_STRING) { + DUK_HOBJECT_SET_EXOTIC_STRINGOBJ(h); + } + + /* some assertions */ + + DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(h)); + /* DUK_HOBJECT_FLAG_CONSTRUCTABLE varies */ + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(h)); + DUK_ASSERT(!DUK_HOBJECT_HAS_COMPFUNC(h)); + /* DUK_HOBJECT_FLAG_NATFUNC varies */ + DUK_ASSERT(!DUK_HOBJECT_IS_THREAD(h)); + DUK_ASSERT(!DUK_HOBJECT_HAS_ARRAY_PART(h) || class_num == DUK_HOBJECT_CLASS_ARRAY); + /* DUK_HOBJECT_FLAG_STRICT varies */ + DUK_ASSERT(!DUK_HOBJECT_HAS_NATFUNC(h) || /* all native functions have NEWENV */ + DUK_HOBJECT_HAS_NEWENV(h)); + DUK_ASSERT(!DUK_HOBJECT_HAS_NAMEBINDING(h)); + DUK_ASSERT(!DUK_HOBJECT_HAS_CREATEARGS(h)); + /* DUK_HOBJECT_FLAG_EXOTIC_ARRAY varies */ + /* DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ varies */ + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(h)); + + DUK_DDD(DUK_DDDPRINT("created built-in %ld, class=%ld, length=%ld", (long) i, (long) class_num, (long) len)); + } + + /* + * Then decode the builtins init data (see genbuiltins.py) to + * init objects. Internal prototypes are set at this stage, + * with thr->builtins[] populated. + */ + + DUK_DD(DUK_DDPRINT("initialize built-in object properties")); + for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) { + duk_small_uint_t t; + duk_small_uint_t num; + + DUK_DDD(DUK_DDDPRINT("initializing built-in object at index %ld", (long) i)); + h = duk_known_hobject(thr, (duk_idx_t) i); + + t = (duk_small_uint_t) duk_bd_decode_varuint(bd); + if (t > 0) { + t--; + DUK_DDD(DUK_DDDPRINT("set internal prototype: built-in %ld", (long) t)); + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, h, duk_known_hobject(thr, (duk_idx_t) t)); + } else if (DUK_HOBJECT_IS_NATFUNC(h)) { + /* Standard native built-ins cannot inherit from + * %NativeFunctionPrototype%, they are required to + * inherit from Function.prototype directly. + */ + DUK_ASSERT(thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE] != NULL); + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, h, thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); + } + + t = (duk_small_uint_t) duk_bd_decode_varuint(bd); + if (t > 0) { + /* 'prototype' property for all built-in objects (which have it) has attributes: + * [[Writable]] = false, + * [[Enumerable]] = false, + * [[Configurable]] = false + */ + t--; + DUK_DDD(DUK_DDDPRINT("set external prototype: built-in %ld", (long) t)); + duk_dup(thr, (duk_idx_t) t); + duk_xdef_prop_stridx(thr, (duk_idx_t) i, DUK_STRIDX_PROTOTYPE, DUK_PROPDESC_FLAGS_NONE); + } + + t = (duk_small_uint_t) duk_bd_decode_varuint(bd); + if (t > 0) { + /* 'constructor' property for all built-in objects (which have it) has attributes: + * [[Writable]] = true, + * [[Enumerable]] = false, + * [[Configurable]] = true + */ + t--; + DUK_DDD(DUK_DDDPRINT("set external constructor: built-in %ld", (long) t)); + duk_dup(thr, (duk_idx_t) t); + duk_xdef_prop_stridx(thr, (duk_idx_t) i, DUK_STRIDX_CONSTRUCTOR, DUK_PROPDESC_FLAGS_WC); + } + + /* normal valued properties */ + num = (duk_small_uint_t) duk_bd_decode_varuint(bd); + DUK_DDD(DUK_DDDPRINT("built-in object %ld, %ld normal valued properties", (long) i, (long) num)); + for (j = 0; j < num; j++) { + duk_small_uint_t defprop_flags; + + duk__push_stridx_or_string(thr, bd); + + /* + * Property attribute defaults are defined in E5 Section 15 (first + * few pages); there is a default for all properties and a special + * default for 'length' properties. Variation from the defaults is + * signaled using a single flag bit in the bitstream. + */ + + defprop_flags = (duk_small_uint_t) duk_bd_decode_flagged(bd, + DUK__PROP_FLAGS_BITS, + (duk_uint32_t) DUK_PROPDESC_FLAGS_WC); + defprop_flags |= DUK_DEFPROP_FORCE | + DUK_DEFPROP_HAVE_VALUE | + DUK_DEFPROP_HAVE_WRITABLE | + DUK_DEFPROP_HAVE_ENUMERABLE | + DUK_DEFPROP_HAVE_CONFIGURABLE; /* Defaults for data properties. */ + + /* The writable, enumerable, configurable flags in prop_flags + * match both duk_def_prop() and internal property flags. + */ + DUK_ASSERT(DUK_PROPDESC_FLAG_WRITABLE == DUK_DEFPROP_WRITABLE); + DUK_ASSERT(DUK_PROPDESC_FLAG_ENUMERABLE == DUK_DEFPROP_ENUMERABLE); + DUK_ASSERT(DUK_PROPDESC_FLAG_CONFIGURABLE == DUK_DEFPROP_CONFIGURABLE); + + t = (duk_small_uint_t) duk_bd_decode(bd, DUK__PROP_TYPE_BITS); + + DUK_DDD(DUK_DDDPRINT("built-in %ld, normal-valued property %ld, key %!T, flags 0x%02lx, type %ld", + (long) i, (long) j, duk_get_tval(thr, -1), (unsigned long) defprop_flags, (long) t)); + + switch (t) { + case DUK__PROP_TYPE_DOUBLE: { + duk__push_double(thr, bd); + break; + } + case DUK__PROP_TYPE_STRING: { + duk__push_string(thr, bd); + break; + } + case DUK__PROP_TYPE_STRIDX: { + duk__push_stridx(thr, bd); + break; + } + case DUK__PROP_TYPE_BUILTIN: { + duk_small_uint_t bidx; + + bidx = (duk_small_uint_t) duk_bd_decode_varuint(bd); + duk_dup(thr, (duk_idx_t) bidx); + break; + } + case DUK__PROP_TYPE_UNDEFINED: { + duk_push_undefined(thr); + break; + } + case DUK__PROP_TYPE_BOOLEAN_TRUE: { + duk_push_true(thr); + break; + } + case DUK__PROP_TYPE_BOOLEAN_FALSE: { + duk_push_false(thr); + break; + } + case DUK__PROP_TYPE_ACCESSOR: { + duk_small_uint_t natidx_getter = (duk_small_uint_t) duk_bd_decode_varuint(bd); + duk_small_uint_t natidx_setter = (duk_small_uint_t) duk_bd_decode_varuint(bd); + duk_small_uint_t accessor_magic = (duk_small_uint_t) duk_bd_decode_varuint(bd); + duk_c_function c_func_getter; + duk_c_function c_func_setter; + + DUK_DDD(DUK_DDDPRINT("built-in accessor property: objidx=%ld, key=%!T, getteridx=%ld, setteridx=%ld, flags=0x%04lx", + (long) i, duk_get_tval(thr, -1), (long) natidx_getter, (long) natidx_setter, (unsigned long) defprop_flags)); + + c_func_getter = duk_bi_native_functions[natidx_getter]; + if (c_func_getter != NULL) { + duk_push_c_function_builtin_noconstruct(thr, c_func_getter, 0); /* always 0 args */ + duk_set_magic(thr, -1, (duk_int_t) accessor_magic); + defprop_flags |= DUK_DEFPROP_HAVE_GETTER; + } + c_func_setter = duk_bi_native_functions[natidx_setter]; + if (c_func_setter != NULL) { + duk_push_c_function_builtin_noconstruct(thr, c_func_setter, 1); /* always 1 arg */ + duk_set_magic(thr, -1, (duk_int_t) accessor_magic); + defprop_flags |= DUK_DEFPROP_HAVE_SETTER; + } + + /* Writable flag doesn't make sense for an accessor. */ + DUK_ASSERT((defprop_flags & DUK_PROPDESC_FLAG_WRITABLE) == 0); /* genbuiltins.py ensures */ + + defprop_flags &= ~(DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_HAVE_WRITABLE); + defprop_flags |= DUK_DEFPROP_HAVE_ENUMERABLE | DUK_DEFPROP_HAVE_CONFIGURABLE; + break; + } + default: { + /* exhaustive */ + DUK_UNREACHABLE(); + } + } + + duk_def_prop(thr, (duk_idx_t) i, defprop_flags); + DUK_ASSERT_TOP(thr, DUK_NUM_ALL_BUILTINS); + } + + /* native function properties */ + num = (duk_small_uint_t) duk_bd_decode_varuint(bd); + DUK_DDD(DUK_DDDPRINT("built-in object %ld, %ld function valued properties", (long) i, (long) num)); + for (j = 0; j < num; j++) { + duk_hstring *h_key; + duk_small_uint_t natidx; + duk_int_t c_nargs; /* must hold DUK_VARARGS */ + duk_small_uint_t c_length; + duk_int16_t magic; + duk_c_function c_func; + duk_hnatfunc *h_func; +#if defined(DUK_USE_LIGHTFUNC_BUILTINS) + duk_small_int_t lightfunc_eligible; +#endif + duk_small_uint_t defprop_flags; + + duk__push_stridx_or_string(thr, bd); + h_key = duk_known_hstring(thr, -1); + DUK_UNREF(h_key); + natidx = (duk_small_uint_t) duk_bd_decode_varuint(bd); + + c_length = (duk_small_uint_t) duk_bd_decode(bd, DUK__LENGTH_PROP_BITS); + c_nargs = (duk_int_t) duk_bd_decode_flagged(bd, DUK__NARGS_BITS, (duk_uint32_t) c_length /*def_value*/); + if (c_nargs == DUK__NARGS_VARARGS_MARKER) { + c_nargs = DUK_VARARGS; + } + + c_func = duk_bi_native_functions[natidx]; + + DUK_DDD(DUK_DDDPRINT("built-in %ld, function-valued property %ld, key %!O, natidx %ld, length %ld, nargs %ld", + (long) i, (long) j, (duk_heaphdr *) h_key, (long) natidx, (long) c_length, + (c_nargs == DUK_VARARGS ? (long) -1 : (long) c_nargs))); + + /* Cast converts magic to 16-bit signed value */ + magic = (duk_int16_t) duk_bd_decode_varuint(bd); + +#if defined(DUK_USE_LIGHTFUNC_BUILTINS) + lightfunc_eligible = + ((c_nargs >= DUK_LFUNC_NARGS_MIN && c_nargs <= DUK_LFUNC_NARGS_MAX) || (c_nargs == DUK_VARARGS)) && + (c_length <= DUK_LFUNC_LENGTH_MAX) && + (magic >= DUK_LFUNC_MAGIC_MIN && magic <= DUK_LFUNC_MAGIC_MAX); + + /* These functions have trouble working as lightfuncs. + * Some of them have specific asserts and some may have + * additional properties (e.g. 'require.id' may be written). + */ + if (c_func == duk_bi_global_object_eval) { + lightfunc_eligible = 0; + } +#if defined(DUK_USE_COROUTINE_SUPPORT) + if (c_func == duk_bi_thread_yield || + c_func == duk_bi_thread_resume) { + lightfunc_eligible = 0; + } +#endif + if (c_func == duk_bi_function_prototype_call || + c_func == duk_bi_function_prototype_apply || + c_func == duk_bi_reflect_apply || + c_func == duk_bi_reflect_construct) { + lightfunc_eligible = 0; + } + + if (lightfunc_eligible) { + duk_tval tv_lfunc; + duk_small_uint_t lf_nargs = (duk_small_uint_t) (c_nargs == DUK_VARARGS ? DUK_LFUNC_NARGS_VARARGS : c_nargs); + duk_small_uint_t lf_flags = DUK_LFUNC_FLAGS_PACK(magic, c_length, lf_nargs); + DUK_TVAL_SET_LIGHTFUNC(&tv_lfunc, c_func, lf_flags); + duk_push_tval(thr, &tv_lfunc); + DUK_D(DUK_DPRINT("built-in function eligible as light function: i=%d, j=%d c_length=%ld, c_nargs=%ld, magic=%ld -> %!iT", (int) i, (int) j, (long) c_length, (long) c_nargs, (long) magic, duk_get_tval(thr, -1))); + goto lightfunc_skip; + } + + DUK_D(DUK_DPRINT("built-in function NOT ELIGIBLE as light function: i=%d, j=%d c_length=%ld, c_nargs=%ld, magic=%ld", (int) i, (int) j, (long) c_length, (long) c_nargs, (long) magic)); +#endif /* DUK_USE_LIGHTFUNC_BUILTINS */ + + /* [ (builtin objects) name ] */ + + duk_push_c_function_builtin_noconstruct(thr, c_func, c_nargs); + h_func = duk_known_hnatfunc(thr, -1); + DUK_UNREF(h_func); + + /* XXX: add into init data? */ + + /* Special call handling, not described in init data. */ + if (c_func == duk_bi_global_object_eval || + c_func == duk_bi_function_prototype_call || + c_func == duk_bi_function_prototype_apply || + c_func == duk_bi_reflect_apply || + c_func == duk_bi_reflect_construct) { + DUK_HOBJECT_SET_SPECIAL_CALL((duk_hobject *) h_func); + } + + /* Currently all built-in native functions are strict. + * This doesn't matter for many functions, but e.g. + * String.prototype.charAt (and other string functions) + * rely on being strict so that their 'this' binding is + * not automatically coerced. + */ + DUK_HOBJECT_SET_STRICT((duk_hobject *) h_func); + + /* No built-in functions are constructable except the top + * level ones (Number, etc). + */ + DUK_ASSERT(!DUK_HOBJECT_HAS_CONSTRUCTABLE((duk_hobject *) h_func)); + + /* XXX: any way to avoid decoding magic bit; there are quite + * many function properties and relatively few with magic values. + */ + h_func->magic = magic; + + /* [ (builtin objects) name func ] */ + + duk_push_uint(thr, c_length); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_C); + + duk_dup_m2(thr); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C); + + /* XXX: other properties of function instances; 'arguments', 'caller'. */ + + DUK_DD(DUK_DDPRINT("built-in object %ld, function property %ld -> %!T", + (long) i, (long) j, (duk_tval *) duk_get_tval(thr, -1))); + + /* [ (builtin objects) name func ] */ + + /* + * The default property attributes are correct for all + * function valued properties of built-in objects now. + */ + +#if defined(DUK_USE_LIGHTFUNC_BUILTINS) + lightfunc_skip: +#endif + + defprop_flags = (duk_small_uint_t) duk_bd_decode_flagged(bd, + DUK__PROP_FLAGS_BITS, + (duk_uint32_t) DUK_PROPDESC_FLAGS_WC); + defprop_flags |= DUK_DEFPROP_FORCE | + DUK_DEFPROP_HAVE_VALUE | + DUK_DEFPROP_HAVE_WRITABLE | + DUK_DEFPROP_HAVE_ENUMERABLE | + DUK_DEFPROP_HAVE_CONFIGURABLE; + DUK_ASSERT(DUK_PROPDESC_FLAG_WRITABLE == DUK_DEFPROP_WRITABLE); + DUK_ASSERT(DUK_PROPDESC_FLAG_ENUMERABLE == DUK_DEFPROP_ENUMERABLE); + DUK_ASSERT(DUK_PROPDESC_FLAG_CONFIGURABLE == DUK_DEFPROP_CONFIGURABLE); + + duk_def_prop(thr, (duk_idx_t) i, defprop_flags); + + /* [ (builtin objects) ] */ + } + } + + /* + * Special post-tweaks, for cases not covered by the init data format. + * + * - Set Date.prototype.toGMTString to Date.prototype.toUTCString. + * toGMTString is required to have the same Function object as + * toUTCString in E5 Section B.2.6. Note that while Smjs respects + * this, V8 does not (the Function objects are distinct). + * + * - Make DoubleError non-extensible. + * + * - Add info about most important effective compile options to Duktape. + * + * - Possibly remove some properties (values or methods) which are not + * desirable with current feature options but are not currently + * conditional in init data. + */ + +#if defined(DUK_USE_DATE_BUILTIN) + duk_get_prop_stridx_short(thr, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_UTC_STRING); + duk_xdef_prop_stridx_short(thr, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_GMT_STRING, DUK_PROPDESC_FLAGS_WC); +#endif + + h = duk_known_hobject(thr, DUK_BIDX_DOUBLE_ERROR); + DUK_HOBJECT_CLEAR_EXTENSIBLE(h); + +#if !defined(DUK_USE_ES6_OBJECT_PROTO_PROPERTY) + DUK_DD(DUK_DDPRINT("delete Object.prototype.__proto__ built-in which is not enabled in features")); + (void) duk_hobject_delprop_raw(thr, thr->builtins[DUK_BIDX_OBJECT_PROTOTYPE], DUK_HTHREAD_STRING___PROTO__(thr), DUK_DELPROP_FLAG_THROW); +#endif + +#if !defined(DUK_USE_ES6_OBJECT_SETPROTOTYPEOF) + DUK_DD(DUK_DDPRINT("delete Object.setPrototypeOf built-in which is not enabled in features")); + (void) duk_hobject_delprop_raw(thr, thr->builtins[DUK_BIDX_OBJECT_CONSTRUCTOR], DUK_HTHREAD_STRING_SET_PROTOTYPE_OF(thr), DUK_DELPROP_FLAG_THROW); +#endif + + /* XXX: relocate */ + duk_push_string(thr, + /* Endianness indicator */ +#if defined(DUK_USE_INTEGER_LE) + "l" +#elif defined(DUK_USE_INTEGER_BE) + "b" +#elif defined(DUK_USE_INTEGER_ME) /* integer mixed endian not really used now */ + "m" +#else + "?" +#endif +#if defined(DUK_USE_DOUBLE_LE) + "l" +#elif defined(DUK_USE_DOUBLE_BE) + "b" +#elif defined(DUK_USE_DOUBLE_ME) + "m" +#else + "?" +#endif + " " + /* Packed or unpacked tval */ +#if defined(DUK_USE_PACKED_TVAL) + "p" +#else + "u" +#endif +#if defined(DUK_USE_FASTINT) + "f" +#endif + " " + /* Low memory/performance options */ +#if defined(DUK_USE_STRTAB_PTRCOMP) + "s" +#endif +#if !defined(DUK_USE_HEAPPTR16) && !defined(DUK_DATAPTR16) && !defined(DUK_FUNCPTR16) + "n" +#endif +#if defined(DUK_USE_HEAPPTR16) + "h" +#endif +#if defined(DUK_USE_DATAPTR16) + "d" +#endif +#if defined(DUK_USE_FUNCPTR16) + "f" +#endif +#if defined(DUK_USE_REFCOUNT16) + "R" +#endif +#if defined(DUK_USE_STRHASH16) + "H" +#endif +#if defined(DUK_USE_STRLEN16) + "S" +#endif +#if defined(DUK_USE_BUFLEN16) + "B" +#endif +#if defined(DUK_USE_OBJSIZES16) + "O" +#endif +#if defined(DUK_USE_LIGHTFUNC_BUILTINS) + "L" +#endif +#if defined(DUK_USE_ROM_STRINGS) || defined(DUK_USE_ROM_OBJECTS) + /* XXX: This won't be shown in practice now + * because this code is not run when builtins + * are in ROM. + */ + "Z" +#endif +#if defined(DUK_USE_LITCACHE_SIZE) + "l" +#endif + " " + /* Object property allocation layout */ +#if defined(DUK_USE_HOBJECT_LAYOUT_1) + "p1" +#elif defined(DUK_USE_HOBJECT_LAYOUT_2) + "p2" +#elif defined(DUK_USE_HOBJECT_LAYOUT_3) + "p3" +#else + "p?" +#endif + " " + /* Alignment guarantee */ +#if (DUK_USE_ALIGN_BY == 4) + "a4" +#elif (DUK_USE_ALIGN_BY == 8) + "a8" +#elif (DUK_USE_ALIGN_BY == 1) + "a1" +#else +#error invalid DUK_USE_ALIGN_BY +#endif + " " + /* Architecture, OS, and compiler strings */ + DUK_USE_ARCH_STRING + " " + DUK_USE_OS_STRING + " " + DUK_USE_COMPILER_STRING); + duk_xdef_prop_stridx_short(thr, DUK_BIDX_DUKTAPE, DUK_STRIDX_ENV, DUK_PROPDESC_FLAGS_WC); + + /* + * Since built-ins are not often extended, compact them. + */ + + DUK_DD(DUK_DDPRINT("compact built-ins")); + for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) { + duk_hobject_compact_props(thr, duk_known_hobject(thr, (duk_idx_t) i)); + } + + DUK_D(DUK_DPRINT("INITBUILTINS END")); + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 1) + for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) { + DUK_DD(DUK_DDPRINT("built-in object %ld after initialization and compacting: %!@iO", + (long) i, (duk_heaphdr *) duk_require_hobject(thr, i))); + } +#endif + + /* + * Pop built-ins from stack: they are now INCREF'd and + * reachable from the builtins[] array or indirectly + * through builtins[]. + */ + + duk_set_top(thr, 0); + DUK_ASSERT_TOP(thr, 0); +} +#endif /* DUK_USE_ROM_OBJECTS */ + +DUK_INTERNAL void duk_hthread_copy_builtin_objects(duk_hthread *thr_from, duk_hthread *thr_to) { + duk_small_uint_t i; + + for (i = 0; i < DUK_NUM_BUILTINS; i++) { + thr_to->builtins[i] = thr_from->builtins[i]; + DUK_HOBJECT_INCREF_ALLOWNULL(thr_to, thr_to->builtins[i]); /* side effect free */ + } +} + +/* automatic undefs */ +#undef DUK__LENGTH_PROP_BITS +#undef DUK__NARGS_BITS +#undef DUK__NARGS_VARARGS_MARKER +#undef DUK__PROP_FLAGS_BITS +#undef DUK__PROP_TYPE_ACCESSOR +#undef DUK__PROP_TYPE_BITS +#undef DUK__PROP_TYPE_BOOLEAN_FALSE +#undef DUK__PROP_TYPE_BOOLEAN_TRUE +#undef DUK__PROP_TYPE_BUILTIN +#undef DUK__PROP_TYPE_DOUBLE +#undef DUK__PROP_TYPE_STRIDX +#undef DUK__PROP_TYPE_STRING +#undef DUK__PROP_TYPE_UNDEFINED +#line 1 "duk_hthread_misc.c" +/* + * Thread support. + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL void duk_hthread_terminate(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + + while (thr->callstack_curr != NULL) { + duk_hthread_activation_unwind_norz(thr); + } + + thr->valstack_bottom = thr->valstack; + duk_set_top(thr, 0); /* unwinds valstack, updating refcounts */ + + thr->state = DUK_HTHREAD_STATE_TERMINATED; + + /* Here we could remove references to built-ins, but it may not be + * worth the effort because built-ins are quite likely to be shared + * with another (unterminated) thread, and terminated threads are also + * usually garbage collected quite quickly. + * + * We could also shrink the value stack here, but that also may not + * be worth the effort for the same reason. + */ + + DUK_REFZERO_CHECK_SLOW(thr); +} + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_INTERNAL duk_uint_fast32_t duk_hthread_get_act_curr_pc(duk_hthread *thr, duk_activation *act) { + duk_instr_t *bcode; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_UNREF(thr); + + /* XXX: store 'bcode' pointer to activation for faster lookup? */ + if (act->func && DUK_HOBJECT_IS_COMPFUNC(act->func)) { + bcode = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, (duk_hcompfunc *) (act->func)); + return (duk_uint_fast32_t) (act->curr_pc - bcode); + } + return 0; +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +DUK_INTERNAL duk_uint_fast32_t duk_hthread_get_act_prev_pc(duk_hthread *thr, duk_activation *act) { + duk_instr_t *bcode; + duk_uint_fast32_t ret; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_UNREF(thr); + + if (act->func && DUK_HOBJECT_IS_COMPFUNC(act->func)) { + bcode = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, (duk_hcompfunc *) (act->func)); + ret = (duk_uint_fast32_t) (act->curr_pc - bcode); + if (ret > 0) { + ret--; + } + return ret; + } + return 0; +} + +/* Write bytecode executor's curr_pc back to topmost activation (if any). */ +DUK_INTERNAL void duk_hthread_sync_currpc(duk_hthread *thr) { + duk_activation *act; + + DUK_ASSERT(thr != NULL); + + if (thr->ptr_curr_pc != NULL) { + /* ptr_curr_pc != NULL only when bytecode executor is active. */ + DUK_ASSERT(thr->callstack_top > 0); + DUK_ASSERT(thr->callstack_curr != NULL); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + act->curr_pc = *thr->ptr_curr_pc; + } +} + +DUK_INTERNAL void duk_hthread_sync_and_null_currpc(duk_hthread *thr) { + duk_activation *act; + + DUK_ASSERT(thr != NULL); + + if (thr->ptr_curr_pc != NULL) { + /* ptr_curr_pc != NULL only when bytecode executor is active. */ + DUK_ASSERT(thr->callstack_top > 0); + DUK_ASSERT(thr->callstack_curr != NULL); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + act->curr_pc = *thr->ptr_curr_pc; + thr->ptr_curr_pc = NULL; + } +} +#line 1 "duk_hthread_stacks.c" +/* + * Thread stack (mainly call stack) primitives: allocation of activations, + * unwinding catchers and activations, etc. + * + * Value stack handling is a part of the API implementation. + */ + +/* #include duk_internal.h -> already included */ + +/* Unwind the topmost catcher of the current activation (caller must check that + * both exist) without side effects. + */ +DUK_INTERNAL void duk_hthread_catcher_unwind_norz(duk_hthread *thr, duk_activation *act) { + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(act->cat != NULL); /* caller must check */ + cat = act->cat; + DUK_ASSERT(cat != NULL); + + DUK_DDD(DUK_DDDPRINT("unwinding catch stack entry %p (lexenv check is done)", (void *) cat)); + + if (DUK_CAT_HAS_LEXENV_ACTIVE(cat)) { + duk_hobject *env; + + env = act->lex_env; /* current lex_env of the activation (created for catcher) */ + DUK_ASSERT(env != NULL); /* must be, since env was created when catcher was created */ + act->lex_env = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, env); /* prototype is lex_env before catcher created */ + DUK_HOBJECT_INCREF(thr, act->lex_env); + DUK_HOBJECT_DECREF_NORZ(thr, env); + + /* There is no need to decref anything else than 'env': if 'env' + * becomes unreachable, refzero will handle decref'ing its prototype. + */ + } + + act->cat = cat->parent; + duk_hthread_catcher_free(thr, cat); +} + +/* Same as above, but caller is certain no catcher-related lexenv may exist. */ +DUK_INTERNAL void duk_hthread_catcher_unwind_nolexenv_norz(duk_hthread *thr, duk_activation *act) { + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(act->cat != NULL); /* caller must check */ + cat = act->cat; + DUK_ASSERT(cat != NULL); + + DUK_DDD(DUK_DDDPRINT("unwinding catch stack entry %p (lexenv check is not done)", (void *) cat)); + + DUK_ASSERT(!DUK_CAT_HAS_LEXENV_ACTIVE(cat)); + + act->cat = cat->parent; + duk_hthread_catcher_free(thr, cat); +} + +DUK_LOCAL +#if defined(DUK_USE_CACHE_CATCHER) +DUK_NOINLINE +#endif +duk_catcher *duk__hthread_catcher_alloc_slow(duk_hthread *thr) { + duk_catcher *cat; + + cat = (duk_catcher *) DUK_ALLOC_CHECKED(thr, sizeof(duk_catcher)); + DUK_ASSERT(cat != NULL); + return cat; +} + +#if defined(DUK_USE_CACHE_CATCHER) +DUK_INTERNAL DUK_INLINE duk_catcher *duk_hthread_catcher_alloc(duk_hthread *thr) { + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + + cat = thr->heap->catcher_free; + if (DUK_LIKELY(cat != NULL)) { + thr->heap->catcher_free = cat->parent; + return cat; + } + + return duk__hthread_catcher_alloc_slow(thr); +} +#else /* DUK_USE_CACHE_CATCHER */ +DUK_INTERNAL duk_catcher *duk_hthread_catcher_alloc(duk_hthread *thr) { + return duk__hthread_catcher_alloc_slow(thr); +} +#endif /* DUK_USE_CACHE_CATCHER */ + +DUK_INTERNAL void duk_hthread_catcher_free(duk_hthread *thr, duk_catcher *cat) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(cat != NULL); + +#if defined(DUK_USE_CACHE_CATCHER) + /* Unconditional caching for now; freed in mark-and-sweep. */ + cat->parent = thr->heap->catcher_free; + thr->heap->catcher_free = cat; +#else + DUK_FREE_CHECKED(thr, (void *) cat); +#endif +} + +DUK_LOCAL +#if defined(DUK_USE_CACHE_ACTIVATION) +DUK_NOINLINE +#endif +duk_activation *duk__hthread_activation_alloc_slow(duk_hthread *thr) { + duk_activation *act; + + act = (duk_activation *) DUK_ALLOC_CHECKED(thr, sizeof(duk_activation)); + DUK_ASSERT(act != NULL); + return act; +} + +#if defined(DUK_USE_CACHE_ACTIVATION) +DUK_INTERNAL DUK_INLINE duk_activation *duk_hthread_activation_alloc(duk_hthread *thr) { + duk_activation *act; + + DUK_ASSERT(thr != NULL); + + act = thr->heap->activation_free; + if (DUK_LIKELY(act != NULL)) { + thr->heap->activation_free = act->parent; + return act; + } + + return duk__hthread_activation_alloc_slow(thr); +} +#else /* DUK_USE_CACHE_ACTIVATION */ +DUK_INTERNAL duk_activation *duk_hthread_activation_alloc(duk_hthread *thr) { + return duk__hthread_activation_alloc_slow(thr); +} +#endif /* DUK_USE_CACHE_ACTIVATION */ + + +DUK_INTERNAL void duk_hthread_activation_free(duk_hthread *thr, duk_activation *act) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + +#if defined(DUK_USE_CACHE_ACTIVATION) + /* Unconditional caching for now; freed in mark-and-sweep. */ + act->parent = thr->heap->activation_free; + thr->heap->activation_free = act; +#else + DUK_FREE_CHECKED(thr, (void *) act); +#endif +} + +/* Internal helper: process the unwind for the topmost activation of a thread, + * but leave the duk_activation in place for possible tailcall reuse. + */ +DUK_LOCAL void duk__activation_unwind_nofree_norz(duk_hthread *thr) { +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_heap *heap; +#endif + duk_activation *act; + duk_hobject *func; + duk_hobject *tmp; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->callstack_curr != NULL); /* caller must check */ + DUK_ASSERT(thr->callstack_top > 0); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + /* With lightfuncs, act 'func' may be NULL. */ + + /* With duk_activation records allocated separately, 'act' is a stable + * pointer and not affected by side effects. + */ + +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + /* + * Restore 'caller' property for non-strict callee functions. + */ + + func = DUK_ACT_GET_FUNC(act); + if (func != NULL && !DUK_HOBJECT_HAS_STRICT(func)) { + duk_tval *tv_caller; + duk_tval tv_tmp; + duk_hobject *h_tmp; + + tv_caller = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_CALLER(thr)); + + /* The act->prev_caller should only be set if the entry for 'caller' + * exists (as it is only set in that case, and the property is not + * configurable), but handle all the cases anyway. + */ + + if (tv_caller) { + DUK_TVAL_SET_TVAL(&tv_tmp, tv_caller); + if (act->prev_caller) { + /* Just transfer the refcount from act->prev_caller to tv_caller, + * so no need for a refcount update. This is the expected case. + */ + DUK_TVAL_SET_OBJECT(tv_caller, act->prev_caller); + act->prev_caller = NULL; + } else { + DUK_TVAL_SET_NULL(tv_caller); /* no incref needed */ + DUK_ASSERT(act->prev_caller == NULL); + } + DUK_TVAL_DECREF_NORZ(thr, &tv_tmp); + } else { + h_tmp = act->prev_caller; + if (h_tmp) { + act->prev_caller = NULL; + DUK_HOBJECT_DECREF_NORZ(thr, h_tmp); + } + } + DUK_ASSERT(act->prev_caller == NULL); + } +#endif + + /* + * Unwind debugger state. If we unwind while stepping + * (for any step type), pause execution. This is the + * only place explicitly handling a step out. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + heap = thr->heap; + if (heap->dbg_pause_act == thr->callstack_curr) { + if (heap->dbg_pause_flags & DUK_PAUSE_FLAG_FUNC_EXIT) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by function exit")); + duk_debug_set_paused(heap); + } else { + DUK_D(DUK_DPRINT("unwound past dbg_pause_act, set to NULL")); + heap->dbg_pause_act = NULL; /* avoid stale pointers */ + } + DUK_ASSERT(heap->dbg_pause_act == NULL); + } +#endif + + /* + * Unwind catchers. + * + * Since there are no references in the catcher structure, + * unwinding is quite simple. The only thing we need to + * look out for is popping a possible lexical environment + * established for an active catch clause. + */ + + while (act->cat != NULL) { + duk_hthread_catcher_unwind_norz(thr, act); + } + + /* + * Close environment record(s) if they exist. + * + * Only variable environments are closed. If lex_env != var_env, it + * cannot currently contain any register bound declarations. + * + * Only environments created for a NEWENV function are closed. If an + * environment is created for e.g. an eval call, it must not be closed. + */ + + func = DUK_ACT_GET_FUNC(act); + if (func != NULL && !DUK_HOBJECT_HAS_NEWENV(func)) { + DUK_DDD(DUK_DDDPRINT("skip closing environments, envs not owned by this activation")); + goto skip_env_close; + } + /* func is NULL for lightfunc */ + + /* Catch sites are required to clean up their environments + * in FINALLY part before propagating, so this should + * always hold here. + */ + DUK_ASSERT(act->lex_env == act->var_env); + + /* XXX: Closing the environment record copies values from registers + * into the scope object. It's side effect free as such, but may + * currently run out of memory which causes an error throw. This is + * an actual sandboxing problem for error unwinds, and needs to be + * fixed e.g. by preallocating the scope property slots. + */ + if (act->var_env != NULL) { + DUK_DDD(DUK_DDDPRINT("closing var_env record %p -> %!O", + (void *) act->var_env, (duk_heaphdr *) act->var_env)); + duk_js_close_environment_record(thr, act->var_env); + } + + skip_env_close: + + /* + * Update preventcount + */ + + if (act->flags & DUK_ACT_FLAG_PREVENT_YIELD) { + DUK_ASSERT(thr->callstack_preventcount >= 1); + thr->callstack_preventcount--; + } + + /* + * Reference count updates, using NORZ macros so we don't + * need to handle side effects. + * + * duk_activation pointers like act->var_env are intentionally + * left as garbage and not NULLed. Without side effects they + * can't be used when the values are dangling/garbage. + */ + + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, act->var_env); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, act->lex_env); + tmp = DUK_ACT_GET_FUNC(act); + DUK_HOBJECT_DECREF_NORZ_ALLOWNULL(thr, tmp); + DUK_UNREF(tmp); +} + +/* Unwind topmost duk_activation of a thread, caller must ensure that an + * activation exists. The call is side effect free, except that scope + * closure may currently throw an out-of-memory error. + */ +DUK_INTERNAL void duk_hthread_activation_unwind_norz(duk_hthread *thr) { + duk_activation *act; + + duk__activation_unwind_nofree_norz(thr); + + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_top > 0); + act = thr->callstack_curr; + thr->callstack_curr = act->parent; + thr->callstack_top--; + + /* Ideally we'd restore value stack reserve here to caller's value. + * This doesn't work for current unwind call sites however, because + * the current (unwound) value stack top may be above the reserve. + * Thus value stack reserve is restored by the call sites. + */ + + /* XXX: inline for performance builds? */ + duk_hthread_activation_free(thr, act); + + /* We could clear the book-keeping variables like retval_byteoff for + * the topmost activation, but don't do so now as it's not necessary. + */ +} + +DUK_INTERNAL void duk_hthread_activation_unwind_reuse_norz(duk_hthread *thr) { + duk__activation_unwind_nofree_norz(thr); +} + +/* Get duk_activation for given callstack level or NULL if level is invalid + * or deeper than the call stack. Level -1 refers to current activation, -2 + * to its caller, etc. Starting from Duktape 2.2 finding the activation is + * a linked list scan which gets more expensive the deeper the lookup is. + */ +DUK_INTERNAL duk_activation *duk_hthread_get_activation_for_level(duk_hthread *thr, duk_int_t level) { + duk_activation *act; + + if (level >= 0) { + return NULL; + } + act = thr->callstack_curr; + for (;;) { + if (act == NULL) { + return act; + } + if (level == -1) { + return act; + } + level++; + act = act->parent; + } + /* never here */ +} + +#if defined(DUK_USE_FINALIZER_TORTURE) +DUK_INTERNAL void duk_hthread_valstack_torture_realloc(duk_hthread *thr) { + duk_size_t alloc_size; + duk_tval *new_ptr; + duk_ptrdiff_t alloc_end_off; + duk_ptrdiff_t end_off; + duk_ptrdiff_t bottom_off; + duk_ptrdiff_t top_off; + + if (thr->valstack == NULL) { + DUK_D(DUK_DPRINT("skip valstack torture realloc, valstack is NULL")); + return; + } + + alloc_end_off = (duk_ptrdiff_t) ((duk_uint8_t *) thr->valstack_alloc_end - (duk_uint8_t *) thr->valstack); + end_off = (duk_ptrdiff_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack); + bottom_off = (duk_ptrdiff_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack); + top_off = (duk_ptrdiff_t) ((duk_uint8_t *) thr->valstack_top - (duk_uint8_t *) thr->valstack); + alloc_size = (duk_size_t) alloc_end_off; + if (alloc_size == 0) { + DUK_D(DUK_DPRINT("skip valstack torture realloc, alloc_size is zero")); + return; + } + + /* Use DUK_ALLOC_RAW() to avoid side effects. */ + new_ptr = (duk_tval *) DUK_ALLOC_RAW(thr->heap, alloc_size); + if (new_ptr != NULL) { + duk_memcpy((void *) new_ptr, (const void *) thr->valstack, alloc_size); + duk_memset((void *) thr->valstack, 0x55, alloc_size); + DUK_FREE_CHECKED(thr, (void *) thr->valstack); + thr->valstack = new_ptr; + thr->valstack_alloc_end = (duk_tval *) ((duk_uint8_t *) new_ptr + alloc_end_off); + thr->valstack_end = (duk_tval *) ((duk_uint8_t *) new_ptr + end_off); + thr->valstack_bottom = (duk_tval *) ((duk_uint8_t *) new_ptr + bottom_off); + thr->valstack_top = (duk_tval *) ((duk_uint8_t *) new_ptr + top_off); + } else { + DUK_D(DUK_DPRINT("failed to realloc valstack for torture, ignore")); + } +} +#endif /* DUK_USE_FINALIZER_TORTURE */ +#line 1 "duk_js_arith.c" +/* + * Shared helpers for arithmetic operations + */ + +/* #include duk_internal.h -> already included */ + +/* ECMAScript modulus ('%') does not match IEEE 754 "remainder" operation + * (implemented by remainder() in C99) but does seem to match ANSI C fmod(). + * Compare E5 Section 11.5.3 and "man fmod". + */ +DUK_INTERNAL double duk_js_arith_mod(double d1, double d2) { +#if defined(DUK_USE_POW_WORKAROUNDS) + /* Specific fixes to common fmod() implementation issues: + * - test-bug-mingw-math-issues.js + */ + if (DUK_ISINF(d2)) { + if (DUK_ISINF(d1)) { + return DUK_DOUBLE_NAN; + } else { + return d1; + } + } else if (d1 == 0.0) { + /* d1 +/-0 is returned as is (preserving sign) except when + * d2 is zero or NaN. + */ + if (d2 == 0.0 || DUK_ISNAN(d2)) { + return DUK_DOUBLE_NAN; + } else { + return d1; + } + } +#else + /* Some ISO C assumptions. */ + DUK_ASSERT(DUK_FMOD(1.0, DUK_DOUBLE_INFINITY) == 1.0); + DUK_ASSERT(DUK_FMOD(-1.0, DUK_DOUBLE_INFINITY) == -1.0); + DUK_ASSERT(DUK_FMOD(1.0, -DUK_DOUBLE_INFINITY) == 1.0); + DUK_ASSERT(DUK_FMOD(-1.0, -DUK_DOUBLE_INFINITY) == -1.0); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(DUK_DOUBLE_INFINITY, DUK_DOUBLE_INFINITY))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(DUK_DOUBLE_INFINITY, -DUK_DOUBLE_INFINITY))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(-DUK_DOUBLE_INFINITY, DUK_DOUBLE_INFINITY))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(-DUK_DOUBLE_INFINITY, -DUK_DOUBLE_INFINITY))); + DUK_ASSERT(DUK_FMOD(0.0, 1.0) == 0.0 && DUK_SIGNBIT(DUK_FMOD(0.0, 1.0)) == 0); + DUK_ASSERT(DUK_FMOD(-0.0, 1.0) == 0.0 && DUK_SIGNBIT(DUK_FMOD(-0.0, 1.0)) != 0); + DUK_ASSERT(DUK_FMOD(0.0, DUK_DOUBLE_INFINITY) == 0.0 && DUK_SIGNBIT(DUK_FMOD(0.0, DUK_DOUBLE_INFINITY)) == 0); + DUK_ASSERT(DUK_FMOD(-0.0, DUK_DOUBLE_INFINITY) == 0.0 && DUK_SIGNBIT(DUK_FMOD(-0.0, DUK_DOUBLE_INFINITY)) != 0); + DUK_ASSERT(DUK_FMOD(0.0, -DUK_DOUBLE_INFINITY) == 0.0 && DUK_SIGNBIT(DUK_FMOD(0.0, DUK_DOUBLE_INFINITY)) == 0); + DUK_ASSERT(DUK_FMOD(-0.0, -DUK_DOUBLE_INFINITY) == 0.0 && DUK_SIGNBIT(DUK_FMOD(-0.0, -DUK_DOUBLE_INFINITY)) != 0); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(0.0, 0.0))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(-0.0, 0.0))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(0.0, -0.0))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(-0.0, -0.0))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(0.0, DUK_DOUBLE_NAN))); + DUK_ASSERT(DUK_ISNAN(DUK_FMOD(-0.0, DUK_DOUBLE_NAN))); +#endif + + return (duk_double_t) DUK_FMOD((double) d1, (double) d2); +} + +/* Shared helper for Math.pow() and exponentiation operator. */ +DUK_INTERNAL double duk_js_arith_pow(double x, double y) { + /* The ANSI C pow() semantics differ from ECMAScript. + * + * E.g. when x==1 and y is +/- infinite, the ECMAScript required + * result is NaN, while at least Linux pow() returns 1. + */ + + duk_small_int_t cx, cy, sx; + + DUK_UNREF(cx); + DUK_UNREF(sx); + cy = (duk_small_int_t) DUK_FPCLASSIFY(y); + + if (cy == DUK_FP_NAN) { + goto ret_nan; + } + if (DUK_FABS(x) == 1.0 && cy == DUK_FP_INFINITE) { + goto ret_nan; + } + +#if defined(DUK_USE_POW_WORKAROUNDS) + /* Specific fixes to common pow() implementation issues: + * - test-bug-netbsd-math-pow.js: NetBSD 6.0 on x86 (at least) + * - test-bug-mingw-math-issues.js + */ + cx = (duk_small_int_t) DUK_FPCLASSIFY(x); + if (cx == DUK_FP_ZERO && y < 0.0) { + sx = (duk_small_int_t) DUK_SIGNBIT(x); + if (sx == 0) { + /* Math.pow(+0,y) should be Infinity when y<0. NetBSD pow() + * returns -Infinity instead when y is <0 and finite. The + * if-clause also catches y == -Infinity (which works even + * without the fix). + */ + return DUK_DOUBLE_INFINITY; + } else { + /* Math.pow(-0,y) where y<0 should be: + * - -Infinity if y<0 and an odd integer + * - Infinity if y<0 but not an odd integer + * NetBSD pow() returns -Infinity for all finite y<0. The + * if-clause also catches y == -Infinity (which works even + * without the fix). + */ + + /* fmod() return value has same sign as input (negative) so + * the result here will be in the range ]-2,0], -1 indicates + * odd. If x is -Infinity, NaN is returned and the odd check + * always concludes "not odd" which results in desired outcome. + */ + double tmp = DUK_FMOD(y, 2); + if (tmp == -1.0) { + return -DUK_DOUBLE_INFINITY; + } else { + /* Not odd, or y == -Infinity */ + return DUK_DOUBLE_INFINITY; + } + } + } else if (cx == DUK_FP_NAN) { + if (y == 0.0) { + /* NaN ** +/- 0 should always be 1, but is NaN on + * at least some Cygwin/MinGW versions. + */ + return 1.0; + } + } +#else + /* Some ISO C assumptions. */ + DUK_ASSERT(DUK_POW(DUK_DOUBLE_NAN, 0.0) == 1.0); + DUK_ASSERT(DUK_ISINF(DUK_POW(0.0, -1.0)) && DUK_SIGNBIT(DUK_POW(0.0, -1.0)) == 0); + DUK_ASSERT(DUK_ISINF(DUK_POW(-0.0, -2.0)) && DUK_SIGNBIT(DUK_POW(-0.0, -2.0)) == 0); + DUK_ASSERT(DUK_ISINF(DUK_POW(-0.0, -3.0)) && DUK_SIGNBIT(DUK_POW(-0.0, -3.0)) != 0); +#endif + + return DUK_POW(x, y); + + ret_nan: + return DUK_DOUBLE_NAN; +} +#line 1 "duk_js_call.c" +/* + * Call handling. + * + * duk_handle_call_unprotected(): + * + * - Unprotected call to ECMAScript or Duktape/C function, from native + * code or bytecode executor. + * + * - Also handles Ecma-to-Ecma calls which reuses a currently running + * executor instance to avoid native recursion. Call setup is done + * normally, but just before calling the bytecode executor a special + * return code is used to indicate that a calling executor is reused. + * + * - Also handles tailcalls, i.e. reuse of current duk_activation. + * + * - Also handles setup for initial Duktape.Thread.resume(). + * + * duk_handle_safe_call(): + * + * - Protected C call within current activation. + * + * setjmp() and local variables have a nasty interaction, see execution.rst; + * non-volatile locals modified after setjmp() call are not guaranteed to + * keep their value and can cause compiler or compiler version specific + * difficult to replicate issues. + * + * See 'execution.rst'. + */ + +/* #include duk_internal.h -> already included */ + +/* XXX: heap->error_not_allowed for success path too? */ + +/* + * Limit check helpers. + */ + +/* Allow headroom for calls during error augmentation (see GH-191). + * We allow space for 10 additional recursions, with one extra + * for, e.g. a print() call at the deepest level, and an extra + * +1 for protected call wrapping. + */ +#define DUK__AUGMENT_CALL_RELAX_COUNT (10 + 2) + +DUK_LOCAL DUK_NOINLINE void duk__call_c_recursion_limit_check_slowpath(duk_hthread *thr) { + /* When augmenting an error, the effective limit is a bit higher. + * Check for it only if the fast path check fails. + */ +#if defined(DUK_USE_AUGMENT_ERROR_THROW) || defined(DUK_USE_AUGMENT_ERROR_CREATE) + if (thr->heap->augmenting_error) { + if (thr->heap->call_recursion_depth < thr->heap->call_recursion_limit + DUK__AUGMENT_CALL_RELAX_COUNT) { + DUK_D(DUK_DPRINT("C recursion limit reached but augmenting error and within relaxed limit")); + return; + } + } +#endif + + DUK_D(DUK_DPRINT("call prevented because C recursion limit reached")); + DUK_ERROR_RANGE(thr, DUK_STR_C_CALLSTACK_LIMIT); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL DUK_ALWAYS_INLINE void duk__call_c_recursion_limit_check(duk_hthread *thr) { + DUK_ASSERT(thr->heap->call_recursion_depth >= 0); + DUK_ASSERT(thr->heap->call_recursion_depth <= thr->heap->call_recursion_limit); + + /* This check is forcibly inlined because it's very cheap and almost + * always passes. The slow path is forcibly noinline. + */ + if (DUK_LIKELY(thr->heap->call_recursion_depth < thr->heap->call_recursion_limit)) { + return; + } + + duk__call_c_recursion_limit_check_slowpath(thr); +} + +DUK_LOCAL DUK_NOINLINE void duk__call_callstack_limit_check_slowpath(duk_hthread *thr) { + /* When augmenting an error, the effective limit is a bit higher. + * Check for it only if the fast path check fails. + */ +#if defined(DUK_USE_AUGMENT_ERROR_THROW) || defined(DUK_USE_AUGMENT_ERROR_CREATE) + if (thr->heap->augmenting_error) { + if (thr->callstack_top < DUK_USE_CALLSTACK_LIMIT + DUK__AUGMENT_CALL_RELAX_COUNT) { + DUK_D(DUK_DPRINT("call stack limit reached but augmenting error and within relaxed limit")); + return; + } + } +#endif + + /* XXX: error message is a bit misleading: we reached a recursion + * limit which is also essentially the same as a C callstack limit + * (except perhaps with some relaxed threading assumptions). + */ + DUK_D(DUK_DPRINT("call prevented because call stack limit reached")); + DUK_ERROR_RANGE(thr, DUK_STR_CALLSTACK_LIMIT); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL DUK_ALWAYS_INLINE void duk__call_callstack_limit_check(duk_hthread *thr) { + /* This check is forcibly inlined because it's very cheap and almost + * always passes. The slow path is forcibly noinline. + */ + if (DUK_LIKELY(thr->callstack_top < DUK_USE_CALLSTACK_LIMIT)) { + return; + } + + duk__call_callstack_limit_check_slowpath(thr); +} + +/* + * Interrupt counter fixup (for development only). + */ + +#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) +DUK_LOCAL void duk__interrupt_fixup(duk_hthread *thr, duk_hthread *entry_curr_thread) { + /* Currently the bytecode executor and executor interrupt + * instruction counts are off because we don't execute the + * interrupt handler when we're about to exit from the initial + * user call into Duktape. + * + * If we were to execute the interrupt handler here, the counts + * would match. You can enable this block manually to check + * that this is the case. + */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + +#if defined(DUK_USE_INTERRUPT_DEBUG_FIXUP) + if (entry_curr_thread == NULL) { + thr->interrupt_init = thr->interrupt_init - thr->interrupt_counter; + thr->heap->inst_count_interrupt += thr->interrupt_init; + DUK_DD(DUK_DDPRINT("debug test: updated interrupt count on exit to " + "user code, instruction counts: executor=%ld, interrupt=%ld", + (long) thr->heap->inst_count_exec, (long) thr->heap->inst_count_interrupt)); + DUK_ASSERT(thr->heap->inst_count_exec == thr->heap->inst_count_interrupt); + } +#else + DUK_UNREF(thr); + DUK_UNREF(entry_curr_thread); +#endif +} +#endif + +/* + * Arguments object creation. + * + * Creating arguments objects involves many small details, see E5 Section + * 10.6 for the specific requirements. Much of the arguments object exotic + * behavior is implemented in duk_hobject_props.c, and is enabled by the + * object flag DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS. + */ + +DUK_LOCAL void duk__create_arguments_object(duk_hthread *thr, + duk_hobject *func, + duk_hobject *varenv, + duk_idx_t idx_args) { + duk_hobject *arg; /* 'arguments' */ + duk_hobject *formals; /* formals for 'func' (may be NULL if func is a C function) */ + duk_idx_t i_arg; + duk_idx_t i_map; + duk_idx_t i_mappednames; + duk_idx_t i_formals; + duk_idx_t i_argbase; + duk_idx_t n_formals; + duk_idx_t idx; + duk_idx_t num_stack_args; + duk_bool_t need_map; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(func != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_NONBOUND_FUNCTION(func)); + DUK_ASSERT(varenv != NULL); + + /* [ ... func this arg1(@idx_args) ... argN envobj ] + * [ arg1(@idx_args) ... argN envobj ] (for tailcalls) + */ + + need_map = 0; + + i_argbase = idx_args; + num_stack_args = duk_get_top(thr) - i_argbase - 1; + DUK_ASSERT(i_argbase >= 0); + DUK_ASSERT(num_stack_args >= 0); + + duk_push_hobject(thr, func); + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_FORMALS); + formals = duk_get_hobject(thr, -1); + if (formals) { + n_formals = (duk_idx_t) duk_get_length(thr, -1); + } else { + /* This shouldn't happen without tampering of internal + * properties: if a function accesses 'arguments', _Formals + * is kept. Check for the case anyway in case internal + * properties have been modified manually. + */ + DUK_D(DUK_DPRINT("_Formals is undefined when creating arguments, use n_formals == 0")); + n_formals = 0; + } + duk_remove_m2(thr); /* leave formals on stack for later use */ + i_formals = duk_require_top_index(thr); + + DUK_ASSERT(n_formals >= 0); + DUK_ASSERT(formals != NULL || n_formals == 0); + + DUK_DDD(DUK_DDDPRINT("func=%!O, formals=%!O, n_formals=%ld", + (duk_heaphdr *) func, (duk_heaphdr *) formals, + (long) n_formals)); + + /* [ ... formals ] */ + + /* + * Create required objects: + * - 'arguments' object: array-like, but not an array + * - 'map' object: internal object, tied to 'arguments' + * - 'mappedNames' object: temporary value used during construction + */ + + arg = duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_FLAG_ARRAY_PART | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARGUMENTS), + DUK_BIDX_OBJECT_PROTOTYPE); + DUK_ASSERT(arg != NULL); + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), + -1); /* no prototype */ + (void) duk_push_object_helper(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_FLAG_FASTREFS | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), + -1); /* no prototype */ + i_arg = duk_get_top(thr) - 3; + i_map = i_arg + 1; + i_mappednames = i_arg + 2; + + /* [ ... formals arguments map mappedNames ] */ + + DUK_DDD(DUK_DDDPRINT("created arguments related objects: " + "arguments at index %ld -> %!O " + "map at index %ld -> %!O " + "mappednames at index %ld -> %!O", + (long) i_arg, (duk_heaphdr *) duk_get_hobject(thr, i_arg), + (long) i_map, (duk_heaphdr *) duk_get_hobject(thr, i_map), + (long) i_mappednames, (duk_heaphdr *) duk_get_hobject(thr, i_mappednames))); + + /* + * Init arguments properties, map, etc. + */ + + duk_push_int(thr, num_stack_args); + duk_xdef_prop_stridx(thr, i_arg, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_WC); + + /* + * Init argument related properties. + */ + + /* step 11 */ + idx = num_stack_args - 1; + while (idx >= 0) { + DUK_DDD(DUK_DDDPRINT("arg idx %ld, argbase=%ld, argidx=%ld", + (long) idx, (long) i_argbase, (long) (i_argbase + idx))); + + DUK_DDD(DUK_DDDPRINT("define arguments[%ld]=arg", (long) idx)); + duk_dup(thr, i_argbase + idx); + duk_xdef_prop_index_wec(thr, i_arg, (duk_uarridx_t) idx); + DUK_DDD(DUK_DDDPRINT("defined arguments[%ld]=arg", (long) idx)); + + /* step 11.c is relevant only if non-strict (checked in 11.c.ii) */ + if (!DUK_HOBJECT_HAS_STRICT(func) && idx < n_formals) { + DUK_ASSERT(formals != NULL); + + DUK_DDD(DUK_DDDPRINT("strict function, index within formals (%ld < %ld)", + (long) idx, (long) n_formals)); + + duk_get_prop_index(thr, i_formals, (duk_uarridx_t) idx); + DUK_ASSERT(duk_is_string(thr, -1)); + + duk_dup_top(thr); /* [ ... name name ] */ + + if (!duk_has_prop(thr, i_mappednames)) { + /* steps 11.c.ii.1 - 11.c.ii.4, but our internal book-keeping + * differs from the reference model + */ + + /* [ ... name ] */ + + need_map = 1; + + DUK_DDD(DUK_DDDPRINT("set mappednames[%s]=%ld", + (const char *) duk_get_string(thr, -1), + (long) idx)); + duk_dup_top(thr); /* name */ + (void) duk_push_uint_to_hstring(thr, (duk_uint_t) idx); /* index */ + duk_xdef_prop_wec(thr, i_mappednames); /* out of spec, must be configurable */ + + DUK_DDD(DUK_DDDPRINT("set map[%ld]=%s", + (long) idx, + duk_get_string(thr, -1))); + duk_dup_top(thr); /* name */ + duk_xdef_prop_index_wec(thr, i_map, (duk_uarridx_t) idx); /* out of spec, must be configurable */ + } else { + /* duk_has_prop() popped the second 'name' */ + } + + /* [ ... name ] */ + duk_pop(thr); /* pop 'name' */ + } + + idx--; + } + + DUK_DDD(DUK_DDDPRINT("actual arguments processed")); + + /* step 12 */ + if (need_map) { + DUK_DDD(DUK_DDDPRINT("adding 'map' and 'varenv' to arguments object")); + + /* should never happen for a strict callee */ + DUK_ASSERT(!DUK_HOBJECT_HAS_STRICT(func)); + + duk_dup(thr, i_map); + duk_xdef_prop_stridx(thr, i_arg, DUK_STRIDX_INT_MAP, DUK_PROPDESC_FLAGS_NONE); /* out of spec, don't care */ + + /* The variable environment for magic variable bindings needs to be + * given by the caller and recorded in the arguments object. + * + * See E5 Section 10.6, the creation of setters/getters. + * + * The variable environment also provides access to the callee, so + * an explicit (internal) callee property is not needed. + */ + + duk_push_hobject(thr, varenv); + duk_xdef_prop_stridx(thr, i_arg, DUK_STRIDX_INT_VARENV, DUK_PROPDESC_FLAGS_NONE); /* out of spec, don't care */ + } + + /* steps 13-14 */ + if (DUK_HOBJECT_HAS_STRICT(func)) { + /* Callee/caller are throwers and are not deletable etc. They + * could be implemented as virtual properties, but currently + * there is no support for virtual properties which are accessors + * (only plain virtual properties). This would not be difficult + * to change in duk_hobject_props, but we can make the throwers + * normal, concrete properties just as easily. + * + * Note that the specification requires that the *same* thrower + * built-in object is used here! See E5 Section 10.6 main + * algoritm, step 14, and Section 13.2.3 which describes the + * thrower. See test case test-arguments-throwers.js. + */ + + DUK_DDD(DUK_DDDPRINT("strict function, setting caller/callee to throwers")); + + duk_xdef_prop_stridx_thrower(thr, i_arg, DUK_STRIDX_CALLER); + duk_xdef_prop_stridx_thrower(thr, i_arg, DUK_STRIDX_CALLEE); + } else { + DUK_DDD(DUK_DDDPRINT("non-strict function, setting callee to actual value")); + duk_push_hobject(thr, func); + duk_xdef_prop_stridx(thr, i_arg, DUK_STRIDX_CALLEE, DUK_PROPDESC_FLAGS_WC); + } + + /* set exotic behavior only after we're done */ + if (need_map) { + /* Exotic behaviors are only enabled for arguments objects + * which have a parameter map (see E5 Section 10.6 main + * algorithm, step 12). + * + * In particular, a non-strict arguments object with no + * mapped formals does *NOT* get exotic behavior, even + * for e.g. "caller" property. This seems counterintuitive + * but seems to be the case. + */ + + /* cannot be strict (never mapped variables) */ + DUK_ASSERT(!DUK_HOBJECT_HAS_STRICT(func)); + + DUK_DDD(DUK_DDDPRINT("enabling exotic behavior for arguments object")); + DUK_HOBJECT_SET_EXOTIC_ARGUMENTS(arg); + } else { + DUK_DDD(DUK_DDDPRINT("not enabling exotic behavior for arguments object")); + } + + DUK_DDD(DUK_DDDPRINT("final arguments related objects: " + "arguments at index %ld -> %!O " + "map at index %ld -> %!O " + "mappednames at index %ld -> %!O", + (long) i_arg, (duk_heaphdr *) duk_get_hobject(thr, i_arg), + (long) i_map, (duk_heaphdr *) duk_get_hobject(thr, i_map), + (long) i_mappednames, (duk_heaphdr *) duk_get_hobject(thr, i_mappednames))); + + /* [ args(n) envobj formals arguments map mappednames ] */ + + duk_pop_2(thr); + duk_remove_m2(thr); + + /* [ args(n) envobj arguments ] */ +} + +/* Helper for creating the arguments object and adding it to the env record + * on top of the value stack. + */ +DUK_LOCAL void duk__handle_createargs_for_call(duk_hthread *thr, + duk_hobject *func, + duk_hobject *env, + duk_idx_t idx_args) { + DUK_DDD(DUK_DDDPRINT("creating arguments object for function call")); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(func != NULL); + DUK_ASSERT(env != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_CREATEARGS(func)); + + /* [ ... arg1 ... argN envobj ] */ + + duk__create_arguments_object(thr, + func, + env, + idx_args); + + /* [ ... arg1 ... argN envobj argobj ] */ + + duk_xdef_prop_stridx_short(thr, + -2, + DUK_STRIDX_LC_ARGUMENTS, + DUK_HOBJECT_HAS_STRICT(func) ? DUK_PROPDESC_FLAGS_E : /* strict: non-deletable, non-writable */ + DUK_PROPDESC_FLAGS_WE); /* non-strict: non-deletable, writable */ + /* [ ... arg1 ... argN envobj ] */ +} + +/* + * Helpers for constructor call handling. + * + * There are two [[Construct]] operations in the specification: + * + * - E5 Section 13.2.2: for Function objects + * - E5 Section 15.3.4.5.2: for "bound" Function objects + * + * The chain of bound functions is resolved in Section 15.3.4.5.2, + * with arguments "piling up" until the [[Construct]] internal + * method is called on the final, actual Function object. Note + * that the "prototype" property is looked up *only* from the + * final object, *before* calling the constructor. + * + * Since Duktape 2.2 bound functions are represented with the + * duk_hboundfunc internal type, and bound function chains are + * collapsed when a bound function is created. As a result, the + * direct target of a duk_hboundfunc is always non-bound and the + * this/argument lists have been resolved. + * + * When constructing new Array instances, an unnecessary object is + * created and discarded now: the standard [[Construct]] creates an + * object, and calls the Array constructor. The Array constructor + * returns an Array instance, which is used as the result value for + * the "new" operation; the object created before the Array constructor + * call is discarded. + * + * This would be easy to fix, e.g. by knowing that the Array constructor + * will always create a replacement object and skip creating the fallback + * object in that case. + */ + +/* Update default instance prototype for constructor call. */ +DUK_LOCAL void duk__update_default_instance_proto(duk_hthread *thr, duk_idx_t idx_func) { + duk_hobject *proto; + duk_hobject *fallback; + + DUK_ASSERT(duk_is_constructable(thr, idx_func)); + + duk_get_prop_stridx_short(thr, idx_func, DUK_STRIDX_PROTOTYPE); + proto = duk_get_hobject(thr, -1); + if (proto == NULL) { + DUK_DDD(DUK_DDDPRINT("constructor has no 'prototype' property, or value not an object " + "-> leave standard Object prototype as fallback prototype")); + } else { + DUK_DDD(DUK_DDDPRINT("constructor has 'prototype' property with object value " + "-> set fallback prototype to that value: %!iO", (duk_heaphdr *) proto)); + /* Original fallback (default instance) is untouched when + * resolving bound functions etc. + */ + fallback = duk_known_hobject(thr, idx_func + 1); + DUK_ASSERT(fallback != NULL); + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, fallback, proto); + } + duk_pop(thr); +} + +/* Postprocess: return value special handling, error augmentation. */ +DUK_INTERNAL void duk_call_construct_postprocess(duk_hthread *thr, duk_small_uint_t proxy_invariant) { + /* Use either fallback (default instance) or retval depending + * on retval type. Needs to be called before unwind because + * the default instance is read from the current (immutable) + * 'this' binding. + * + * For Proxy 'construct' calls the return value must be an + * Object (we accept object-like values like buffers and + * lightfuncs too). If not, TypeError. + */ + if (duk_check_type_mask(thr, -1, DUK_TYPE_MASK_OBJECT | + DUK_TYPE_MASK_BUFFER | + DUK_TYPE_MASK_LIGHTFUNC)) { + DUK_DDD(DUK_DDDPRINT("replacement value")); + } else { + if (DUK_UNLIKELY(proxy_invariant != 0U)) { + /* Proxy 'construct' return value invariant violated. */ + DUK_ERROR_TYPE_INVALID_TRAP_RESULT(thr); + DUK_WO_NORETURN(return;); + } + /* XXX: direct value stack access */ + duk_pop(thr); + duk_push_this(thr); + } + +#if defined(DUK_USE_AUGMENT_ERROR_CREATE) + /* Augment created errors upon creation, not when they are thrown or + * rethrown. __FILE__ and __LINE__ are not desirable here; the call + * stack reflects the caller which is correct. Skip topmost, unwound + * activation when creating a traceback. If thr->ptr_curr_pc was != + * NULL we'd need to sync the current PC so that the traceback comes + * out right; however it is always synced here so just assert for it. + */ + DUK_ASSERT(thr->ptr_curr_pc == NULL); + duk_err_augment_error_create(thr, thr, NULL, 0, DUK_AUGMENT_FLAG_NOBLAME_FILELINE | + DUK_AUGMENT_FLAG_SKIP_ONE); +#endif +} + +/* + * Helper for handling a bound function when a call is being made. + * + * Assumes that bound function chains have been "collapsed" so that either + * the target is non-bound or there is one bound function that points to a + * nonbound target. + * + * Prepends the bound arguments to the value stack (at idx_func + 2). + * The 'this' binding is also updated if necessary (at idx_func + 1). + * Note that for constructor calls the 'this' binding is never updated by + * [[BoundThis]]. + */ + +DUK_LOCAL void duk__handle_bound_chain_for_call(duk_hthread *thr, + duk_idx_t idx_func, + duk_bool_t is_constructor_call) { + duk_tval *tv_func; + duk_hobject *func; + duk_idx_t len; + + DUK_ASSERT(thr != NULL); + + /* On entry, item at idx_func is a bound, non-lightweight function, + * but we don't rely on that below. + */ + + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + + tv_func = duk_require_tval(thr, idx_func); + DUK_ASSERT(tv_func != NULL); + + if (DUK_TVAL_IS_OBJECT(tv_func)) { + func = DUK_TVAL_GET_OBJECT(tv_func); + + /* XXX: separate helper function, out of fast path? */ + if (DUK_HOBJECT_HAS_BOUNDFUNC(func)) { + duk_hboundfunc *h_bound; + duk_tval *tv_args; + duk_tval *tv_gap; + + h_bound = (duk_hboundfunc *) (void *) func; + tv_args = h_bound->args; + len = h_bound->nargs; + DUK_ASSERT(len == 0 || tv_args != NULL); + + DUK_DDD(DUK_DDDPRINT("bound function encountered, ptr=%p: %!T", + (void *) DUK_TVAL_GET_OBJECT(tv_func), tv_func)); + + /* [ ... func this arg1 ... argN ] */ + + if (is_constructor_call) { + /* See: tests/ecmascript/test-spec-bound-constructor.js */ + DUK_DDD(DUK_DDDPRINT("constructor call: don't update this binding")); + } else { + /* XXX: duk_replace_tval */ + duk_push_tval(thr, &h_bound->this_binding); + duk_replace(thr, idx_func + 1); /* idx_this = idx_func + 1 */ + } + + /* [ ... func this arg1 ... argN ] */ + + duk_require_stack(thr, len); + + tv_gap = duk_reserve_gap(thr, idx_func + 2, len); + duk_copy_tvals_incref(thr, tv_gap, tv_args, (duk_size_t) len); + + /* [ ... func this <bound args> arg1 ... argN ] */ + + duk_push_tval(thr, &h_bound->target); + duk_replace(thr, idx_func); /* replace in stack */ + + DUK_DDD(DUK_DDDPRINT("bound function handled, idx_func=%ld, curr func=%!T", + (long) idx_func, duk_get_tval(thr, idx_func))); + } + } else if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) { + /* Lightweight function: never bound, so terminate. */ + ; + } else { + /* Shouldn't happen, so ugly error is enough. */ + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return;); + } + + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + + DUK_DDD(DUK_DDDPRINT("final non-bound function is: %!T", duk_get_tval(thr, idx_func))); + +#if defined(DUK_USE_ASSERTIONS) + tv_func = duk_require_tval(thr, idx_func); + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv_func) || DUK_TVAL_IS_OBJECT(tv_func)); + if (DUK_TVAL_IS_OBJECT(tv_func)) { + func = DUK_TVAL_GET_OBJECT(tv_func); + DUK_ASSERT(func != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(func)); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(func) || + DUK_HOBJECT_HAS_NATFUNC(func)); + } +#endif +} + +/* + * Helper for inline handling of .call(), .apply(), and .construct(). + */ + +DUK_LOCAL duk_bool_t duk__handle_specialfuncs_for_call(duk_hthread *thr, duk_idx_t idx_func, duk_hobject *func, duk_small_uint_t *call_flags, duk_bool_t first) { +#if defined(DUK_USE_ASSERTIONS) + duk_c_function natfunc; +#endif + duk_tval *tv_args; + + DUK_ASSERT(func != NULL); + DUK_ASSERT((*call_flags & DUK_CALL_FLAG_CONSTRUCT) == 0); /* Caller. */ + +#if defined(DUK_USE_ASSERTIONS) + natfunc = ((duk_hnatfunc *) func)->func; + DUK_ASSERT(natfunc != NULL); +#endif + + /* On every round of function resolution at least target function and + * 'this' binding are set. We can assume that here, and must guarantee + * it on exit. Value stack reserve is extended for bound function and + * .apply() unpacking so we don't need to extend it here when we need a + * few slots. + */ + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + + /* Handle native 'eval' specially. A direct eval check is only made + * for the first resolution attempt; e.g. a bound eval call is -not- + * a direct eval call. + */ + if (DUK_UNLIKELY(((duk_hnatfunc *) func)->magic == 15)) { + /* For now no special handling except for direct eval + * detection. + */ + DUK_ASSERT(((duk_hnatfunc *) func)->func == duk_bi_global_object_eval); + if (first && (*call_flags & DUK_CALL_FLAG_CALLED_AS_EVAL)) { + *call_flags = (*call_flags & ~DUK_CALL_FLAG_CALLED_AS_EVAL) | DUK_CALL_FLAG_DIRECT_EVAL; + } + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + return 1; /* stop resolving */ + } + + /* Handle special functions based on the DUK_HOBJECT_FLAG_SPECIAL_CALL + * flag; their magic value is used for switch-case. + * + * NOTE: duk_unpack_array_like() reserves value stack space + * for the result values (unlike most other value stack calls). + */ + switch (((duk_hnatfunc *) func)->magic) { + case 0: { /* 0=Function.prototype.call() */ + /* Value stack: + * idx_func + 0: Function.prototype.call() [removed] + * idx_func + 1: this binding for .call (target function) + * idx_func + 2: 1st argument to .call, desired 'this' binding + * idx_func + 3: 2nd argument to .call, desired 1st argument for ultimate target + * ... + * + * Remove idx_func + 0 to get: + * idx_func + 0: target function + * idx_func + 1: this binding + * idx_func + 2: call arguments + * ... + */ + DUK_ASSERT(natfunc == duk_bi_function_prototype_call); + duk_remove_unsafe(thr, idx_func); + tv_args = thr->valstack_bottom + idx_func + 2; + if (thr->valstack_top < tv_args) { + DUK_ASSERT(tv_args <= thr->valstack_end); + thr->valstack_top = tv_args; /* at least target function and 'this' binding present */ + } + break; + } + case 1: { /* 1=Function.prototype.apply() */ + /* Value stack: + * idx_func + 0: Function.prototype.apply() [removed] + * idx_func + 1: this binding for .apply (target function) + * idx_func + 2: 1st argument to .apply, desired 'this' binding + * idx_func + 3: 2nd argument to .apply, argArray + * [anything after this MUST be ignored] + * + * Remove idx_func + 0 and unpack the argArray to get: + * idx_func + 0: target function + * idx_func + 1: this binding + * idx_func + 2: call arguments + * ... + */ + DUK_ASSERT(natfunc == duk_bi_function_prototype_apply); + duk_remove_unsafe(thr, idx_func); + goto apply_shared; + } +#if defined(DUK_USE_REFLECT_BUILTIN) + case 2: { /* 2=Reflect.apply() */ + /* Value stack: + * idx_func + 0: Reflect.apply() [removed] + * idx_func + 1: this binding for .apply (ignored, usually Reflect) [removed] + * idx_func + 2: 1st argument to .apply, target function + * idx_func + 3: 2nd argument to .apply, desired 'this' binding + * idx_func + 4: 3rd argument to .apply, argArray + * [anything after this MUST be ignored] + * + * Remove idx_func + 0 and idx_func + 1, and unpack the argArray to get: + * idx_func + 0: target function + * idx_func + 1: this binding + * idx_func + 2: call arguments + * ... + */ + DUK_ASSERT(natfunc == duk_bi_reflect_apply); + duk_remove_n_unsafe(thr, idx_func, 2); + goto apply_shared; + } + case 3: { /* 3=Reflect.construct() */ + /* Value stack: + * idx_func + 0: Reflect.construct() [removed] + * idx_func + 1: this binding for .construct (ignored, usually Reflect) [removed] + * idx_func + 2: 1st argument to .construct, target function + * idx_func + 3: 2nd argument to .construct, argArray + * idx_func + 4: 3rd argument to .construct, newTarget + * [anything after this MUST be ignored] + * + * Remove idx_func + 0 and idx_func + 1, unpack the argArray, + * and insert default instance (prototype not yet updated), to get: + * idx_func + 0: target function + * idx_func + 1: this binding (default instance) + * idx_func + 2: constructor call arguments + * ... + * + * Call flags must be updated to reflect the fact that we're + * now dealing with a constructor call, and e.g. the 'this' + * binding cannot be overwritten if the target is bound. + * + * newTarget is checked but not yet passed onwards. + */ + + duk_idx_t top; + + DUK_ASSERT(natfunc == duk_bi_reflect_construct); + *call_flags |= DUK_CALL_FLAG_CONSTRUCT; + duk_remove_n_unsafe(thr, idx_func, 2); + top = duk_get_top(thr); + if (!duk_is_constructable(thr, idx_func)) { + /* Target constructability must be checked before + * unpacking argArray (which may cause side effects). + * Just return; caller will throw the error. + */ + duk_set_top_unsafe(thr, idx_func + 2); /* satisfy asserts */ + break; + } + duk_push_object(thr); + duk_insert(thr, idx_func + 1); /* default instance */ + + /* [ ... func default_instance argArray newTarget? ] */ + + top = duk_get_top(thr); + if (top < idx_func + 3) { + /* argArray is a mandatory argument for Reflect.construct(). */ + DUK_ERROR_TYPE_INVALID_ARGS(thr); + DUK_WO_NORETURN(return 0;); + } + if (top > idx_func + 3) { + if (!duk_strict_equals(thr, idx_func, idx_func + 3)) { + /* XXX: [[Construct]] newTarget currently unsupported */ + DUK_ERROR_UNSUPPORTED(thr); + DUK_WO_NORETURN(return 0;); + } + duk_set_top_unsafe(thr, idx_func + 3); /* remove any args beyond argArray */ + } + DUK_ASSERT(duk_get_top(thr) == idx_func + 3); + DUK_ASSERT(duk_is_valid_index(thr, idx_func + 2)); + (void) duk_unpack_array_like(thr, idx_func + 2); /* XXX: should also remove target to be symmetric with duk_pack()? */ + duk_remove(thr, idx_func + 2); + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + break; + } +#endif /* DUK_USE_REFLECT_BUILTIN */ + default: { + DUK_ASSERT(0); + DUK_UNREACHABLE(); + } + } + + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + return 0; /* keep resolving */ + + apply_shared: + tv_args = thr->valstack_bottom + idx_func + 2; + if (thr->valstack_top <= tv_args) { + DUK_ASSERT(tv_args <= thr->valstack_end); + thr->valstack_top = tv_args; /* at least target func and 'this' binding present */ + /* No need to check for argArray. */ + } else { + DUK_ASSERT(duk_get_top(thr) >= idx_func + 3); /* idx_func + 2 covered above */ + if (thr->valstack_top > tv_args + 1) { + duk_set_top_unsafe(thr, idx_func + 3); /* remove any args beyond argArray */ + } + DUK_ASSERT(duk_is_valid_index(thr, idx_func + 2)); + if (!duk_is_callable(thr, idx_func)) { + /* Avoid unpack side effects if the target isn't callable. + * Calling code will throw the actual error. + */ + } else { + (void) duk_unpack_array_like(thr, idx_func + 2); + duk_remove(thr, idx_func + 2); + } + } + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + return 0; /* keep resolving */ +} + +/* + * Helper for Proxy handling. + */ + +#if defined(DUK_USE_ES6_PROXY) +DUK_LOCAL void duk__handle_proxy_for_call(duk_hthread *thr, duk_idx_t idx_func, duk_hproxy *h_proxy, duk_small_uint_t *call_flags) { + duk_bool_t rc; + + /* Value stack: + * idx_func + 0: Proxy object + * idx_func + 1: this binding for call + * idx_func + 2: 1st argument for call + * idx_func + 3: 2nd argument for call + * ... + * + * If Proxy doesn't have a trap for the call ('apply' or 'construct'), + * replace Proxy object with target object. + * + * If we're dealing with a normal call and the Proxy has an 'apply' + * trap, manipulate value stack to: + * + * idx_func + 0: trap + * idx_func + 1: Proxy's handler + * idx_func + 2: Proxy's target + * idx_func + 3: this binding for call (from idx_func + 1) + * idx_func + 4: call arguments packed to an array + * + * If we're dealing with a constructor call and the Proxy has a + * 'construct' trap, manipulate value stack to: + * + * idx_func + 0: trap + * idx_func + 1: Proxy's handler + * idx_func + 2: Proxy's target + * idx_func + 3: call arguments packed to an array + * idx_func + 4: newTarget == Proxy object here + * + * As we don't yet have proper newTarget support, the newTarget at + * idx_func + 3 is just the original constructor being called, i.e. + * the Proxy object (not the target). Note that the default instance + * (original 'this' binding) is dropped and ignored. + */ + + duk_push_hobject(thr, h_proxy->handler); + rc = duk_get_prop_stridx_short(thr, -1, (*call_flags & DUK_CALL_FLAG_CONSTRUCT) ? DUK_STRIDX_CONSTRUCT : DUK_STRIDX_APPLY); + if (rc == 0) { + /* Not found, continue to target. If this is a construct + * call, update default instance prototype using the Proxy, + * not the target. + */ + if (*call_flags & DUK_CALL_FLAG_CONSTRUCT) { + if (!(*call_flags & DUK_CALL_FLAG_DEFAULT_INSTANCE_UPDATED)) { + *call_flags |= DUK_CALL_FLAG_DEFAULT_INSTANCE_UPDATED; + duk__update_default_instance_proto(thr, idx_func); + } + } + duk_pop_2(thr); + duk_push_hobject(thr, h_proxy->target); + duk_replace(thr, idx_func); + return; + } + + /* Here we must be careful not to replace idx_func while + * h_proxy is still needed, otherwise h_proxy may become + * dangling. This could be improved e.g. using a + * duk_pack_slice() with a freeform slice. + */ + + /* Here: + * idx_func + 0: Proxy object + * idx_func + 1: this binding for call + * idx_func + 2: 1st argument for call + * idx_func + 3: 2nd argument for call + * ... + * idx_func + N: handler + * idx_func + N + 1: trap + */ + + duk_insert(thr, idx_func + 1); + duk_insert(thr, idx_func + 2); + duk_push_hobject(thr, h_proxy->target); + duk_insert(thr, idx_func + 3); + duk_pack(thr, duk_get_top(thr) - (idx_func + 5)); + + /* Here: + * idx_func + 0: Proxy object + * idx_func + 1: trap + * idx_func + 2: Proxy's handler + * idx_func + 3: Proxy's target + * idx_func + 4: this binding for call + * idx_func + 5: arguments array + */ + DUK_ASSERT(duk_get_top(thr) == idx_func + 6); + + if (*call_flags & DUK_CALL_FLAG_CONSTRUCT) { + *call_flags |= DUK_CALL_FLAG_CONSTRUCT_PROXY; /* Enable 'construct' trap return invariant check. */ + *call_flags &= ~(DUK_CALL_FLAG_CONSTRUCT); /* Resume as non-constructor call to the trap. */ + + /* 'apply' args: target, thisArg, argArray + * 'construct' args: target, argArray, newTarget + */ + duk_remove(thr, idx_func + 4); + duk_push_hobject(thr, (duk_hobject *) h_proxy); + } + + /* Finalize value stack layout by removing Proxy reference. */ + duk_remove(thr, idx_func); + h_proxy = NULL; /* invalidated */ + DUK_ASSERT(duk_get_top(thr) == idx_func + 5); +} +#endif /* DUK_USE_ES6_PROXY */ + +/* + * Helper for setting up var_env and lex_env of an activation, + * assuming it does NOT have the DUK_HOBJECT_FLAG_NEWENV flag. + */ + +DUK_LOCAL void duk__handle_oldenv_for_call(duk_hthread *thr, + duk_hobject *func, + duk_activation *act) { + duk_hcompfunc *f; + duk_hobject *h_lex; + duk_hobject *h_var; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(func != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_NEWENV(func)); + DUK_ASSERT(!DUK_HOBJECT_HAS_CREATEARGS(func)); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(func)); + DUK_UNREF(thr); + + f = (duk_hcompfunc *) func; + h_lex = DUK_HCOMPFUNC_GET_LEXENV(thr->heap, f); + h_var = DUK_HCOMPFUNC_GET_VARENV(thr->heap, f); + DUK_ASSERT(h_lex != NULL); /* Always true for closures (not for templates) */ + DUK_ASSERT(h_var != NULL); + act->lex_env = h_lex; + act->var_env = h_var; + DUK_HOBJECT_INCREF(thr, h_lex); + DUK_HOBJECT_INCREF(thr, h_var); +} + +/* + * Helper for updating callee 'caller' property. + */ + +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) +DUK_LOCAL void duk__update_func_caller_prop(duk_hthread *thr, duk_hobject *func) { + duk_tval *tv_caller; + duk_hobject *h_tmp; + duk_activation *act_callee; + duk_activation *act_caller; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(func != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(func)); /* bound chain resolved */ + DUK_ASSERT(thr->callstack_top >= 1); + + if (DUK_HOBJECT_HAS_STRICT(func)) { + /* Strict functions don't get their 'caller' updated. */ + return; + } + + DUK_ASSERT(thr->callstack_top > 0); + act_callee = thr->callstack_curr; + DUK_ASSERT(act_callee != NULL); + act_caller = (thr->callstack_top >= 2 ? act_callee->parent : NULL); + + /* XXX: check .caller writability? */ + + /* Backup 'caller' property and update its value. */ + tv_caller = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_CALLER(thr)); + if (tv_caller) { + /* If caller is global/eval code, 'caller' should be set to + * 'null'. + * + * XXX: there is no exotic flag to infer this correctly now. + * The NEWENV flag is used now which works as intended for + * everything (global code, non-strict eval code, and functions) + * except strict eval code. Bound functions are never an issue + * because 'func' has been resolved to a non-bound function. + */ + + if (act_caller != NULL) { + /* act_caller->func may be NULL in some finalization cases, + * just treat like we don't know the caller. + */ + if (act_caller->func && !DUK_HOBJECT_HAS_NEWENV(act_caller->func)) { + /* Setting to NULL causes 'caller' to be set to + * 'null' as desired. + */ + act_caller = NULL; + } + } + + if (DUK_TVAL_IS_OBJECT(tv_caller)) { + h_tmp = DUK_TVAL_GET_OBJECT(tv_caller); + DUK_ASSERT(h_tmp != NULL); + act_callee->prev_caller = h_tmp; + + /* Previous value doesn't need refcount changes because its ownership + * is transferred to prev_caller. + */ + + if (act_caller != NULL) { + DUK_ASSERT(act_caller->func != NULL); + DUK_TVAL_SET_OBJECT(tv_caller, act_caller->func); + DUK_TVAL_INCREF(thr, tv_caller); + } else { + DUK_TVAL_SET_NULL(tv_caller); /* no incref */ + } + } else { + /* 'caller' must only take on 'null' or function value */ + DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv_caller)); + DUK_ASSERT(act_callee->prev_caller == NULL); + if (act_caller != NULL && act_caller->func) { + /* Tolerate act_caller->func == NULL which happens in + * some finalization cases; treat like unknown caller. + */ + DUK_TVAL_SET_OBJECT(tv_caller, act_caller->func); + DUK_TVAL_INCREF(thr, tv_caller); + } else { + DUK_TVAL_SET_NULL(tv_caller); /* no incref */ + } + } + } +} +#endif /* DUK_USE_NONSTD_FUNC_CALLER_PROPERTY */ + +/* + * Shared helpers for resolving the final, non-bound target function of the + * call and the effective 'this' binding. Resolves bound functions and + * applies .call(), .apply(), and .construct() inline. + * + * Proxy traps are also handled inline so that if the target is a Proxy with + * a 'call' or 'construct' trap, the trap handler is called with a modified + * argument list. + * + * Once the bound function / .call() / .apply() / .construct() sequence has + * been resolved, the value at idx_func + 1 may need coercion described in + * E5 Section 10.4.3. + * + * A call that begins as a non-constructor call may be converted into a + * constructor call during the resolution process if Reflect.construct() + * is invoked. This is handled by updating the caller's call_flags. + * + * For global and eval code (E5 Sections 10.4.1 and 10.4.2), we assume + * that the caller has provided the correct 'this' binding explicitly + * when calling, i.e.: + * + * - global code: this=global object + * - direct eval: this=copy from eval() caller's this binding + * - other eval: this=global object + * + * The 'this' coercion may cause a recursive function call with arbitrary + * side effects, because ToObject() may be called. + */ + +DUK_LOCAL DUK_INLINE void duk__coerce_nonstrict_this_binding(duk_hthread *thr, duk_idx_t idx_this) { + duk_tval *tv_this; + duk_hobject *obj_global; + + tv_this = thr->valstack_bottom + idx_this; + switch (DUK_TVAL_GET_TAG(tv_this)) { + case DUK_TAG_OBJECT: + DUK_DDD(DUK_DDDPRINT("this binding: non-strict, object -> use directly")); + break; + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: + DUK_DDD(DUK_DDDPRINT("this binding: non-strict, undefined/null -> use global object")); + obj_global = thr->builtins[DUK_BIDX_GLOBAL]; + /* XXX: avoid this check somehow */ + if (DUK_LIKELY(obj_global != NULL)) { + DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv_this)); /* no need to decref previous value */ + DUK_TVAL_SET_OBJECT(tv_this, obj_global); + DUK_HOBJECT_INCREF(thr, obj_global); + } else { + /* This may only happen if built-ins are being "torn down". + * This behavior is out of specification scope. + */ + DUK_D(DUK_DPRINT("this binding: wanted to use global object, but it is NULL -> using undefined instead")); + DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv_this)); /* no need to decref previous value */ + DUK_TVAL_SET_UNDEFINED(tv_this); /* nothing to incref */ + } + break; + default: + /* Plain buffers and lightfuncs are object coerced. Lightfuncs + * very rarely come here however, because the call target would + * need to be a non-strict non-lightfunc (lightfuncs are considered + * strict) with an explicit lightfunc 'this' binding. + */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv_this)); + DUK_DDD(DUK_DDDPRINT("this binding: non-strict, not object/undefined/null -> use ToObject(value)")); + duk_to_object(thr, idx_this); /* may have side effects */ + break; + } +} + +DUK_LOCAL DUK_ALWAYS_INLINE duk_bool_t duk__resolve_target_fastpath_check(duk_hthread *thr, duk_idx_t idx_func, duk_hobject **out_func, duk_small_uint_t call_flags) { +#if defined(DUK_USE_PREFER_SIZE) + DUK_UNREF(thr); + DUK_UNREF(idx_func); + DUK_UNREF(out_func); + DUK_UNREF(call_flags); +#else /* DUK_USE_PREFER_SIZE */ + duk_tval *tv_func; + duk_hobject *func; + + if (DUK_UNLIKELY(call_flags & DUK_CALL_FLAG_CONSTRUCT)) { + return 0; + } + + tv_func = DUK_GET_TVAL_POSIDX(thr, idx_func); + DUK_ASSERT(tv_func != NULL); + + if (DUK_LIKELY(DUK_TVAL_IS_OBJECT(tv_func))) { + func = DUK_TVAL_GET_OBJECT(tv_func); + if (DUK_HOBJECT_IS_CALLABLE(func) && + !DUK_HOBJECT_HAS_BOUNDFUNC(func) && + !DUK_HOBJECT_HAS_SPECIAL_CALL(func)) { + *out_func = func; + + if (DUK_HOBJECT_HAS_STRICT(func)) { + /* Strict function: no 'this' coercion. */ + return 1; + } + + duk__coerce_nonstrict_this_binding(thr, idx_func + 1); + return 1; + } + } else if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) { + *out_func = NULL; + + /* Lightfuncs are considered strict, so 'this' binding is + * used as is. They're never bound, always constructable, + * and never special functions. + */ + return 1; + } +#endif /* DUK_USE_PREFER_SIZE */ + return 0; /* let slow path deal with it */ +} + +DUK_LOCAL duk_hobject *duk__resolve_target_func_and_this_binding(duk_hthread *thr, + duk_idx_t idx_func, + duk_small_uint_t *call_flags) { + duk_tval *tv_func; + duk_hobject *func; + duk_bool_t first; + + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + + for (first = 1;; first = 0) { + DUK_ASSERT(duk_get_top(thr) >= idx_func + 2); + + tv_func = DUK_GET_TVAL_POSIDX(thr, idx_func); + DUK_ASSERT(tv_func != NULL); + + if (DUK_TVAL_IS_OBJECT(tv_func)) { + func = DUK_TVAL_GET_OBJECT(tv_func); + + if (*call_flags & DUK_CALL_FLAG_CONSTRUCT) { + if (DUK_UNLIKELY(!DUK_HOBJECT_HAS_CONSTRUCTABLE(func))) { + goto not_constructable; + } + } else { + if (DUK_UNLIKELY(!DUK_HOBJECT_IS_CALLABLE(func))) { + goto not_callable; + } + } + + if (DUK_LIKELY(!DUK_HOBJECT_HAS_BOUNDFUNC(func) && + !DUK_HOBJECT_HAS_SPECIAL_CALL(func) && + !DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(func))) { + /* Common case, so test for using a single bitfield test. + * Break out to handle this coercion etc. + */ + break; + } + + /* XXX: could set specialcall for boundfuncs too, simplify check above */ + + if (DUK_HOBJECT_HAS_BOUNDFUNC(func)) { + DUK_ASSERT(!DUK_HOBJECT_HAS_SPECIAL_CALL(func)); + DUK_ASSERT(!DUK_HOBJECT_IS_NATFUNC(func)); + + /* Callable/constructable flags are the same + * for the bound function and its target, so + * we don't need to check them here, we can + * check them from the target only. + */ + duk__handle_bound_chain_for_call(thr, idx_func, *call_flags & DUK_CALL_FLAG_CONSTRUCT); + + DUK_ASSERT(DUK_TVAL_IS_OBJECT(duk_require_tval(thr, idx_func)) || + DUK_TVAL_IS_LIGHTFUNC(duk_require_tval(thr, idx_func))); + } else { + DUK_ASSERT(DUK_HOBJECT_HAS_SPECIAL_CALL(func)); + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(func)) { + /* If no trap, resume processing from Proxy trap. + * If trap exists, helper converts call into a trap + * call; this may change a constructor call into a + * normal (non-constructor) trap call. We must + * continue processing even when a trap is found as + * the trap may be bound. + */ + duk__handle_proxy_for_call(thr, idx_func, (duk_hproxy *) func, call_flags); + } + else +#endif + { + DUK_ASSERT(DUK_HOBJECT_IS_NATFUNC(func)); + DUK_ASSERT(DUK_HOBJECT_HAS_CALLABLE(func)); + DUK_ASSERT(!DUK_HOBJECT_HAS_CONSTRUCTABLE(func)); + /* Constructable check already done above. */ + + if (duk__handle_specialfuncs_for_call(thr, idx_func, func, call_flags, first) != 0) { + /* Encountered native eval call, normal call + * context. Break out, handle this coercion etc. + */ + break; + } + } + } + /* Retry loop. */ + } else if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) { + /* Lightfuncs are: + * - Always strict, so no 'this' coercion. + * - Always callable. + * - Always constructable. + * - Never specialfuncs. + */ + func = NULL; + goto finished; + } else { + goto not_callable; + } + } + + DUK_ASSERT(func != NULL); + + if (!DUK_HOBJECT_HAS_STRICT(func)) { + /* Non-strict target needs 'this' coercion. + * This has potential side effects invalidating + * 'tv_func'. + */ + duk__coerce_nonstrict_this_binding(thr, idx_func + 1); + } + if (*call_flags & DUK_CALL_FLAG_CONSTRUCT) { + if (!(*call_flags & DUK_CALL_FLAG_DEFAULT_INSTANCE_UPDATED)) { + *call_flags |= DUK_CALL_FLAG_DEFAULT_INSTANCE_UPDATED; + duk__update_default_instance_proto(thr, idx_func); + } + } + + finished: + +#if defined(DUK_USE_ASSERTIONS) + { + duk_tval *tv_tmp; + + tv_tmp = duk_get_tval(thr, idx_func); + DUK_ASSERT(tv_tmp != NULL); + + DUK_ASSERT((DUK_TVAL_IS_OBJECT(tv_tmp) && DUK_HOBJECT_IS_CALLABLE(DUK_TVAL_GET_OBJECT(tv_tmp))) || + DUK_TVAL_IS_LIGHTFUNC(tv_tmp)); + DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUNDFUNC(func)); + DUK_ASSERT(func == NULL || (DUK_HOBJECT_IS_COMPFUNC(func) || + DUK_HOBJECT_IS_NATFUNC(func))); + DUK_ASSERT(func == NULL || (DUK_HOBJECT_HAS_CONSTRUCTABLE(func) || + (*call_flags & DUK_CALL_FLAG_CONSTRUCT) == 0)); + } +#endif + + return func; + + not_callable: + DUK_ASSERT(tv_func != NULL); + +#if defined(DUK_USE_VERBOSE_ERRORS) + /* GETPROPC delayed error handling: when target is not callable, + * GETPROPC replaces idx_func+0 with an Error (non-callable) with + * a hidden Symbol to signify it's to be thrown as is here. The + * hidden Symbol is only checked as an own property, not inherited + * (which would be dangerous). + */ + if (DUK_TVAL_IS_OBJECT(tv_func)) { + if (duk_hobject_find_existing_entry_tval_ptr(thr->heap, DUK_TVAL_GET_OBJECT(tv_func), DUK_HTHREAD_STRING_INT_TARGET(thr)) != NULL) { + duk_push_tval(thr, tv_func); + (void) duk_throw(thr); + DUK_WO_NORETURN(return NULL;); + } + } +#endif + +#if defined(DUK_USE_VERBOSE_ERRORS) +#if defined(DUK_USE_PARANOID_ERRORS) + DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "%s not callable", duk_get_type_name(thr, idx_func)); +#else + DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "%s not callable", duk_push_string_tval_readable(thr, tv_func)); +#endif +#else + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE); +#endif + DUK_WO_NORETURN(return NULL;); + + not_constructable: + /* For now GETPROPC delayed error not needed for constructor calls. */ +#if defined(DUK_USE_VERBOSE_ERRORS) +#if defined(DUK_USE_PARANOID_ERRORS) + DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "%s not constructable", duk_get_type_name(thr, idx_func)); +#else + DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "%s not constructable", duk_push_string_tval_readable(thr, tv_func)); +#endif +#else + DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONSTRUCTABLE); +#endif + DUK_WO_NORETURN(return NULL;); +} + +/* + * Manipulate value stack so that exactly 'num_stack_rets' return + * values are at 'idx_retbase' in every case, assuming there are + * 'rc' return values on top of stack. + * + * This is a bit tricky, because the called C function operates in + * the same activation record and may have e.g. popped the stack + * empty (below idx_retbase). + */ + +DUK_LOCAL void duk__safe_call_adjust_valstack(duk_hthread *thr, duk_idx_t idx_retbase, duk_idx_t num_stack_rets, duk_idx_t num_actual_rets) { + duk_idx_t idx_rcbase; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(idx_retbase >= 0); + DUK_ASSERT(num_stack_rets >= 0); + DUK_ASSERT(num_actual_rets >= 0); + + idx_rcbase = duk_get_top(thr) - num_actual_rets; /* base of known return values */ + if (DUK_UNLIKELY(idx_rcbase < 0)) { + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_CFUNC_RC); + DUK_WO_NORETURN(return;); + } + + DUK_DDD(DUK_DDDPRINT("adjust valstack after func call: " + "num_stack_rets=%ld, num_actual_rets=%ld, stack_top=%ld, idx_retbase=%ld, idx_rcbase=%ld", + (long) num_stack_rets, (long) num_actual_rets, (long) duk_get_top(thr), + (long) idx_retbase, (long) idx_rcbase)); + + DUK_ASSERT(idx_rcbase >= 0); /* caller must check */ + + /* Space for num_stack_rets was reserved before the safe call. + * Because value stack reserve cannot shrink except in call returns, + * the reserve is still in place. Adjust valstack, carefully + * ensuring we don't overstep the reserve. + */ + + /* Match idx_rcbase with idx_retbase so that the return values + * start at the correct index. + */ + if (idx_rcbase > idx_retbase) { + duk_idx_t count = idx_rcbase - idx_retbase; + + DUK_DDD(DUK_DDDPRINT("elements at/after idx_retbase have enough to cover func retvals " + "(idx_retbase=%ld, idx_rcbase=%ld)", (long) idx_retbase, (long) idx_rcbase)); + + /* Remove values between irc_rcbase (start of intended return + * values) and idx_retbase to lower return values to idx_retbase. + */ + DUK_ASSERT(count > 0); + duk_remove_n(thr, idx_retbase, count); /* may be NORZ */ + } else { + duk_idx_t count = idx_retbase - idx_rcbase; + + DUK_DDD(DUK_DDDPRINT("not enough elements at/after idx_retbase to cover func retvals " + "(idx_retbase=%ld, idx_rcbase=%ld)", (long) idx_retbase, (long) idx_rcbase)); + + /* Insert 'undefined' at idx_rcbase (start of intended return + * values) to lift return values to idx_retbase. + */ + DUK_ASSERT(count >= 0); + DUK_ASSERT(thr->valstack_end - thr->valstack_top >= count); /* reserve cannot shrink */ + duk_insert_undefined_n(thr, idx_rcbase, count); + } + + /* Chop extra retvals away / extend with undefined. */ + duk_set_top_unsafe(thr, idx_retbase + num_stack_rets); +} + +/* + * Activation setup for tailcalls and non-tailcalls. + */ + +#if defined(DUK_USE_TAILCALL) +DUK_LOCAL duk_small_uint_t duk__call_setup_act_attempt_tailcall(duk_hthread *thr, + duk_small_uint_t call_flags, + duk_idx_t idx_func, + duk_hobject *func, + duk_size_t entry_valstack_bottom_byteoff, + duk_size_t entry_valstack_end_byteoff, + duk_idx_t *out_nargs, + duk_idx_t *out_nregs, + duk_size_t *out_vs_min_bytes, + duk_activation **out_act) { + duk_activation *act; + duk_tval *tv1, *tv2; + duk_idx_t idx_args; + duk_small_uint_t flags1, flags2; +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_activation *prev_pause_act; +#endif + + DUK_UNREF(entry_valstack_end_byteoff); + + /* Tailcall cannot be flagged to resume calls, and a + * previous frame must exist. + */ + DUK_ASSERT(thr->callstack_top >= 1); + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + *out_act = act; + + if (func == NULL || !DUK_HOBJECT_IS_COMPFUNC(func)) { + DUK_DDD(DUK_DDDPRINT("tail call prevented by target not being ecma function")); + return 0; + } + if (act->flags & DUK_ACT_FLAG_PREVENT_YIELD) { + DUK_DDD(DUK_DDDPRINT("tail call prevented by current activation having DUK_ACT_FLAG_PREVENT_YIELD")); + return 0; + } + /* Tailcall is only allowed if current and candidate + * function have identical return value handling. There + * are three possible return value handling cases: + * 1. Normal function call, no special return value handling. + * 2. Constructor call, return value replacement object check. + * 3. Proxy 'construct' trap call, return value invariant check. + */ + flags1 = (duk_small_uint_t) ((act->flags & DUK_ACT_FLAG_CONSTRUCT) ? 1 : 0) +#if defined(DUK_USE_ES6_PROXY) + | (duk_small_uint_t) ((act->flags & DUK_ACT_FLAG_CONSTRUCT_PROXY) ? 2 : 0) +#endif + ; + flags2 = (duk_small_uint_t) ((call_flags & DUK_CALL_FLAG_CONSTRUCT) ? 1 : 0) +#if defined(DUK_USE_ES6_PROXY) + | (duk_small_uint_t) ((call_flags & DUK_CALL_FLAG_CONSTRUCT_PROXY) ? 2 : 0); +#endif + ; + if (flags1 != flags2) { + DUK_DDD(DUK_DDDPRINT("tail call prevented by incompatible return value handling")); + return 0; + } + DUK_ASSERT(((act->flags & DUK_ACT_FLAG_CONSTRUCT) && (call_flags & DUK_CALL_FLAG_CONSTRUCT)) || + (!(act->flags & DUK_ACT_FLAG_CONSTRUCT) && !(call_flags & DUK_CALL_FLAG_CONSTRUCT))); + DUK_ASSERT(((act->flags & DUK_ACT_FLAG_CONSTRUCT_PROXY) && (call_flags & DUK_CALL_FLAG_CONSTRUCT_PROXY)) || + (!(act->flags & DUK_ACT_FLAG_CONSTRUCT_PROXY) && !(call_flags & DUK_CALL_FLAG_CONSTRUCT_PROXY))); + if (DUK_HOBJECT_HAS_NOTAIL(func)) { + /* See: test-bug-tailcall-preventyield-assert.c. */ + DUK_DDD(DUK_DDDPRINT("tail call prevented by function having a notail flag")); + return 0; + } + + /* + * Tailcall handling + * + * Although the callstack entry is reused, we need to explicitly unwind + * the current activation (or simulate an unwind). In particular, the + * current activation must be closed, otherwise something like + * test-bug-reduce-judofyr.js results. Also catchers need to be unwound + * because there may be non-error-catching label entries in valid tail calls. + * + * Special attention is needed for debugger and pause behavior when + * reusing an activation. + * - Disable StepOut processing for the activation unwind because + * we reuse the activation, see: + * https://github.com/svaarala/duktape/issues/1684. + * - Disable line change pause flag permanently if act == dbg_pause_act + * (if set) because it would no longer be relevant, see: + * https://github.com/svaarala/duktape/issues/1726, + * https://github.com/svaarala/duktape/issues/1786. + * - Check for function entry (e.g. StepInto) pause flag here, because + * the executor pause check won't trigger due to shared activation, see: + * https://github.com/svaarala/duktape/issues/1726. + */ + + DUK_DDD(DUK_DDDPRINT("is tail call, reusing activation at callstack top, at index %ld", + (long) (thr->callstack_top - 1))); + + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(func)); + DUK_ASSERT(!DUK_HOBJECT_HAS_NATFUNC(func)); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(func)); + DUK_ASSERT((act->flags & DUK_ACT_FLAG_PREVENT_YIELD) == 0); + DUK_ASSERT(call_flags & DUK_CALL_FLAG_ALLOW_ECMATOECMA); + + /* Unwind the topmost callstack entry before reusing it. This + * also unwinds the catchers related to the topmost entry. + */ + DUK_ASSERT(thr->callstack_top > 0); + DUK_ASSERT(thr->callstack_curr != NULL); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (act == thr->heap->dbg_pause_act) { + thr->heap->dbg_pause_flags &= ~DUK_PAUSE_FLAG_LINE_CHANGE; + } + + prev_pause_act = thr->heap->dbg_pause_act; + thr->heap->dbg_pause_act = NULL; + if (thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_FUNC_ENTRY) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by function entry (tailcall)")); + duk_debug_set_paused(thr->heap); + } +#endif + duk_hthread_activation_unwind_reuse_norz(thr); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + thr->heap->dbg_pause_act = prev_pause_act; +#endif + DUK_ASSERT(act == thr->callstack_curr); + + /* XXX: We could restore the caller's value stack reserve + * here, as if we did an actual unwind-and-call. Without + * the restoration, value stack reserve may remain higher + * than would otherwise be possible until we return to a + * non-tailcall. + */ + + /* Then reuse the unwound activation. */ + act->cat = NULL; + act->var_env = NULL; + act->lex_env = NULL; + DUK_ASSERT(func != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(func)); + act->func = func; /* don't want an intermediate exposed state with func == NULL */ +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + act->prev_caller = NULL; +#endif + /* don't want an intermediate exposed state with invalid pc */ + act->curr_pc = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, (duk_hcompfunc *) func); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + act->prev_line = 0; +#endif + DUK_TVAL_SET_OBJECT(&act->tv_func, func); /* borrowed, no refcount */ + DUK_HOBJECT_INCREF(thr, func); + + act->flags = DUK_ACT_FLAG_TAILCALLED; + if (DUK_HOBJECT_HAS_STRICT(func)) { + act->flags |= DUK_ACT_FLAG_STRICT; + } + if (call_flags & DUK_CALL_FLAG_CONSTRUCT) { + act->flags |= DUK_ACT_FLAG_CONSTRUCT; + } +#if defined(DUK_USE_ES6_PROXY) + if (call_flags & DUK_CALL_FLAG_CONSTRUCT_PROXY) { + act->flags |= DUK_ACT_FLAG_CONSTRUCT_PROXY; + } +#endif + + DUK_ASSERT(DUK_ACT_GET_FUNC(act) == func); /* already updated */ + DUK_ASSERT(act->var_env == NULL); + DUK_ASSERT(act->lex_env == NULL); + act->bottom_byteoff = entry_valstack_bottom_byteoff; /* tail call -> reuse current "frame" */ +#if 0 + /* Topmost activation retval_byteoff is considered garbage, no need to init. */ + act->retval_byteoff = 0; +#endif + /* Filled in when final reserve is known, dummy value doesn't matter + * even in error unwind because reserve_byteoff is only used when + * returning to -this- activation. + */ + act->reserve_byteoff = 0; + + /* + * Manipulate valstack so that args are on the current bottom and the + * previous caller's 'this' binding (which is the value preceding the + * current bottom) is replaced with the new 'this' binding: + * + * [ ... this_old | (crud) func this_new arg1 ... argN ] + * --> [ ... this_new | arg1 ... argN ] + * + * For tail calling to work properly, the valstack bottom must not grow + * here; otherwise crud would accumulate on the valstack. + */ + + tv1 = thr->valstack_bottom - 1; + tv2 = thr->valstack_bottom + idx_func + 1; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); /* tv1 is -below- valstack_bottom */ + DUK_ASSERT(tv2 >= thr->valstack_bottom && tv2 < thr->valstack_top); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects */ + + idx_args = idx_func + 2; + duk_remove_n(thr, 0, idx_args); /* may be NORZ */ + + idx_func = 0; DUK_UNREF(idx_func); /* really 'not applicable' anymore, should not be referenced after this */ + idx_args = 0; + + *out_nargs = ((duk_hcompfunc *) func)->nargs; + *out_nregs = ((duk_hcompfunc *) func)->nregs; + DUK_ASSERT(*out_nregs >= 0); + DUK_ASSERT(*out_nregs >= *out_nargs); + *out_vs_min_bytes = entry_valstack_bottom_byteoff + sizeof(duk_tval) * ((duk_size_t) *out_nregs + DUK_VALSTACK_INTERNAL_EXTRA); + + +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) +#if defined(DUK_USE_TAILCALL) +#error incorrect options: tail calls enabled with function caller property +#endif + /* XXX: This doesn't actually work properly for tail calls, so + * tail calls are disabled when DUK_USE_NONSTD_FUNC_CALLER_PROPERTY + * is in use. + */ + duk__update_func_caller_prop(thr, func); +#endif + + /* [ ... this_new | arg1 ... argN ] */ + + return 1; +} +#endif /* DUK_USE_TAILCALL */ + +DUK_LOCAL void duk__call_setup_act_not_tailcall(duk_hthread *thr, + duk_small_uint_t call_flags, + duk_idx_t idx_func, + duk_hobject *func, + duk_size_t entry_valstack_bottom_byteoff, + duk_size_t entry_valstack_end_byteoff, + duk_idx_t *out_nargs, + duk_idx_t *out_nregs, + duk_size_t *out_vs_min_bytes, + duk_activation **out_act) { + duk_activation *act; + duk_activation *new_act; + + DUK_UNREF(entry_valstack_end_byteoff); + + DUK_DDD(DUK_DDDPRINT("not a tail call, pushing a new activation to callstack, to index %ld", + (long) (thr->callstack_top))); + + duk__call_callstack_limit_check(thr); + new_act = duk_hthread_activation_alloc(thr); + DUK_ASSERT(new_act != NULL); + + act = thr->callstack_curr; + if (act != NULL) { + /* + * Update return value stack index of current activation (if any). + * + * Although it might seem this is not necessary (bytecode executor + * does this for ECMAScript-to-ECMAScript calls; other calls are + * handled here), this turns out to be necessary for handling yield + * and resume. For them, an ECMAScript-to-native call happens, and + * the ECMAScript call's retval_byteoff must be set for things to work. + */ + + act->retval_byteoff = entry_valstack_bottom_byteoff + (duk_size_t) idx_func * sizeof(duk_tval); + } + + new_act->parent = act; + thr->callstack_curr = new_act; + thr->callstack_top++; + act = new_act; + *out_act = act; + + DUK_ASSERT(thr->valstack_top > thr->valstack_bottom); /* at least effective 'this' */ + DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUNDFUNC(func)); + + act->cat = NULL; + + act->flags = 0; + if (call_flags & DUK_CALL_FLAG_CONSTRUCT) { + act->flags |= DUK_ACT_FLAG_CONSTRUCT; + } +#if defined(DUK_USE_ES6_PROXY) + if (call_flags & DUK_CALL_FLAG_CONSTRUCT_PROXY) { + act->flags |= DUK_ACT_FLAG_CONSTRUCT_PROXY; + } +#endif + if (call_flags & DUK_CALL_FLAG_DIRECT_EVAL) { + act->flags |= DUK_ACT_FLAG_DIRECT_EVAL; + } + + /* start of arguments: idx_func + 2. */ + act->func = func; /* NULL for lightfunc */ + if (DUK_LIKELY(func != NULL)) { + DUK_TVAL_SET_OBJECT(&act->tv_func, func); /* borrowed, no refcount */ + if (DUK_HOBJECT_HAS_STRICT(func)) { + act->flags |= DUK_ACT_FLAG_STRICT; + } + if (DUK_HOBJECT_IS_COMPFUNC(func)) { + *out_nargs = ((duk_hcompfunc *) func)->nargs; + *out_nregs = ((duk_hcompfunc *) func)->nregs; + DUK_ASSERT(*out_nregs >= 0); + DUK_ASSERT(*out_nregs >= *out_nargs); + *out_vs_min_bytes = entry_valstack_bottom_byteoff + + sizeof(duk_tval) * ((duk_size_t) idx_func + 2U + (duk_size_t) *out_nregs + DUK_VALSTACK_INTERNAL_EXTRA); + } else { + /* True because of call target lookup checks. */ + DUK_ASSERT(DUK_HOBJECT_IS_NATFUNC(func)); + + *out_nargs = ((duk_hnatfunc *) func)->nargs; + *out_nregs = *out_nargs; + if (*out_nargs >= 0) { + *out_vs_min_bytes = entry_valstack_bottom_byteoff + + sizeof(duk_tval) * ((duk_size_t) idx_func + 2U + (duk_size_t) *out_nregs + DUK_VALSTACK_API_ENTRY_MINIMUM + DUK_VALSTACK_INTERNAL_EXTRA); + } else { + /* Vararg function. */ + duk_size_t valstack_top_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - ((duk_uint8_t *) thr->valstack)); + *out_vs_min_bytes = valstack_top_byteoff + + sizeof(duk_tval) * (DUK_VALSTACK_API_ENTRY_MINIMUM + DUK_VALSTACK_INTERNAL_EXTRA); + } + } + } else { + duk_small_uint_t lf_flags; + duk_tval *tv_func; + + act->flags |= DUK_ACT_FLAG_STRICT; + + tv_func = DUK_GET_TVAL_POSIDX(thr, idx_func); + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv_func)); + DUK_TVAL_SET_TVAL(&act->tv_func, tv_func); /* borrowed, no refcount */ + + lf_flags = DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv_func); + *out_nargs = DUK_LFUNC_FLAGS_GET_NARGS(lf_flags); + if (*out_nargs != DUK_LFUNC_NARGS_VARARGS) { + *out_vs_min_bytes = entry_valstack_bottom_byteoff + + sizeof(duk_tval) * ((duk_size_t) idx_func + 2U + (duk_size_t) *out_nargs + DUK_VALSTACK_API_ENTRY_MINIMUM + DUK_VALSTACK_INTERNAL_EXTRA); + } else { + duk_size_t valstack_top_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - ((duk_uint8_t *) thr->valstack)); + *out_vs_min_bytes = valstack_top_byteoff + + sizeof(duk_tval) * (DUK_VALSTACK_API_ENTRY_MINIMUM + DUK_VALSTACK_INTERNAL_EXTRA); + *out_nargs = -1; /* vararg */ + } + *out_nregs = *out_nargs; + } + + act->var_env = NULL; + act->lex_env = NULL; +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + act->prev_caller = NULL; +#endif + act->curr_pc = NULL; +#if defined(DUK_USE_DEBUGGER_SUPPORT) + act->prev_line = 0; +#endif + act->bottom_byteoff = entry_valstack_bottom_byteoff + sizeof(duk_tval) * ((duk_size_t) idx_func + 2U); +#if 0 + act->retval_byteoff = 0; /* topmost activation retval_byteoff is considered garbage, no need to init */ +#endif + /* Filled in when final reserve is known, dummy value doesn't matter + * even in error unwind because reserve_byteoff is only used when + * returning to -this- activation. + */ + act->reserve_byteoff = 0; /* filled in by caller */ + + /* XXX: Is this INCREF necessary? 'func' is always a borrowed + * reference reachable through the value stack? If changed, stack + * unwind code also needs to be fixed to match. + */ + DUK_HOBJECT_INCREF_ALLOWNULL(thr, func); /* act->func */ + +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + if (func) { + duk__update_func_caller_prop(thr, func); + } +#endif +} + +/* + * Environment setup. + */ + +DUK_LOCAL void duk__call_env_setup(duk_hthread *thr, duk_hobject *func, duk_activation *act, duk_idx_t idx_args) { + duk_hobject *env; + + DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUNDFUNC(func)); /* bound function has already been resolved */ + + if (DUK_LIKELY(func != NULL)) { + if (DUK_LIKELY(DUK_HOBJECT_HAS_NEWENV(func))) { + if (DUK_LIKELY(!DUK_HOBJECT_HAS_CREATEARGS(func))) { + /* Use a new environment but there's no 'arguments' object; + * delayed environment initialization. This is the most + * common case. + */ + DUK_ASSERT(act->lex_env == NULL); + DUK_ASSERT(act->var_env == NULL); + } else { + /* Use a new environment and there's an 'arguments' object. + * We need to initialize it right now. + */ + + /* third arg: absolute index (to entire valstack) of bottom_byteoff of new activation */ + env = duk_create_activation_environment_record(thr, func, act->bottom_byteoff); + DUK_ASSERT(env != NULL); + + /* [ ... func this arg1 ... argN envobj ] */ + + DUK_ASSERT(DUK_HOBJECT_HAS_CREATEARGS(func)); + duk__handle_createargs_for_call(thr, func, env, idx_args); + + /* [ ... func this arg1 ... argN envobj ] */ + + act->lex_env = env; + act->var_env = env; + DUK_HOBJECT_INCREF(thr, env); + DUK_HOBJECT_INCREF(thr, env); /* XXX: incref by count (2) directly */ + duk_pop(thr); + } + } else { + /* Use existing env (e.g. for non-strict eval); cannot have + * an own 'arguments' object (but can refer to an existing one). + */ + + DUK_ASSERT(!DUK_HOBJECT_HAS_CREATEARGS(func)); + + duk__handle_oldenv_for_call(thr, func, act); + + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + } + } else { + /* Lightfuncs are always native functions and have "newenv". */ + DUK_ASSERT(act->lex_env == NULL); + DUK_ASSERT(act->var_env == NULL); + } +} + +/* + * Misc shared helpers. + */ + +/* Check thread state, update current thread. */ +DUK_LOCAL void duk__call_thread_state_update(duk_hthread *thr) { + DUK_ASSERT(thr != NULL); + + if (DUK_LIKELY(thr == thr->heap->curr_thread)) { + if (DUK_UNLIKELY(thr->state != DUK_HTHREAD_STATE_RUNNING)) { + /* Should actually never happen, but check anyway. */ + goto thread_state_error; + } + } else { + DUK_ASSERT(thr->heap->curr_thread == NULL || + thr->heap->curr_thread->state == DUK_HTHREAD_STATE_RUNNING); + if (DUK_UNLIKELY(thr->state != DUK_HTHREAD_STATE_INACTIVE)) { + goto thread_state_error; + } + DUK_HEAP_SWITCH_THREAD(thr->heap, thr); + thr->state = DUK_HTHREAD_STATE_RUNNING; + + /* Multiple threads may be simultaneously in the RUNNING + * state, but not in the same "resume chain". + */ + } + DUK_ASSERT(thr->heap->curr_thread == thr); + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); + return; + + thread_state_error: + DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "invalid thread state (%ld)", (long) thr->state); + DUK_WO_NORETURN(return;); +} + +/* + * Main unprotected call handler, handles: + * + * - All combinations of native/ECMAScript caller and native/ECMAScript + * target. + * + * - Optimized ECMAScript-to-ECMAScript call where call handling only + * sets up a new duk_activation but reuses an existing bytecode executor + * (the caller) without native recursion. + * + * - Tailcalls, where an activation is reused without increasing call + * stack (duk_activation) depth. + * + * - Setup for an initial Duktape.Thread.resume(). + * + * The call handler doesn't provide any protection guarantees, protected calls + * must be implemented e.g. by wrapping the call in a duk_safe_call(). + * Call setup may fail at any stage, even when the new activation is in + * place; the only guarantee is that the state is consistent for unwinding. + */ + +DUK_LOCAL duk_int_t duk__handle_call_raw(duk_hthread *thr, + duk_idx_t idx_func, + duk_small_uint_t call_flags) { +#if defined(DUK_USE_ASSERTIONS) + duk_activation *entry_act; + duk_size_t entry_callstack_top; +#endif + duk_size_t entry_valstack_bottom_byteoff; + duk_size_t entry_valstack_end_byteoff; + duk_int_t entry_call_recursion_depth; + duk_hthread *entry_curr_thread; + duk_uint_fast8_t entry_thread_state; + duk_instr_t **entry_ptr_curr_pc; + duk_idx_t idx_args; + duk_idx_t nargs; /* # argument registers target function wants (< 0 => "as is") */ + duk_idx_t nregs; /* # total registers target function wants on entry (< 0 => "as is") */ + duk_size_t vs_min_bytes; /* minimum value stack size (bytes) for handling call */ + duk_hobject *func; /* 'func' on stack (borrowed reference) */ + duk_activation *act; + duk_ret_t rc; + duk_small_uint_t use_tailcall; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + /* Asserts for heap->curr_thread omitted: it may be NULL, 'thr', or + * any other thread (e.g. when heap thread is used to run finalizers). + */ + DUK_ASSERT_CTX_VALID(thr); + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + DUK_ASSERT(idx_func >= 0); + + DUK_STATS_INC(thr->heap, stats_call_all); + + /* If a tail call: + * - an ECMAScript activation must be on top of the callstack + * - there cannot be any catch stack entries that would catch + * a return + */ +#if defined(DUK_USE_ASSERTIONS) + if (call_flags & DUK_CALL_FLAG_TAILCALL) { + duk_activation *tmp_act; + duk_catcher *tmp_cat; + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr))); + + /* No entry in the catch stack which would actually catch a + * throw can refer to the callstack entry being reused. + * There *can* be catch stack entries referring to the current + * callstack entry as long as they don't catch (e.g. label sites). + */ + + tmp_act = thr->callstack_curr; + for (tmp_cat = tmp_act->cat; tmp_cat != NULL; tmp_cat = tmp_cat->parent) { + DUK_ASSERT(DUK_CAT_GET_TYPE(tmp_cat) == DUK_CAT_TYPE_LABEL); /* a non-catching entry */ + } + } +#endif /* DUK_USE_ASSERTIONS */ + + /* + * Store entry state. + */ + +#if defined(DUK_USE_ASSERTIONS) + entry_act = thr->callstack_curr; + entry_callstack_top = thr->callstack_top; +#endif + entry_valstack_bottom_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack); + entry_valstack_end_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack); + entry_call_recursion_depth = thr->heap->call_recursion_depth; + entry_curr_thread = thr->heap->curr_thread; /* may be NULL if first call */ + entry_thread_state = thr->state; + entry_ptr_curr_pc = thr->ptr_curr_pc; /* may be NULL */ + + /* If thr->ptr_curr_pc is set, sync curr_pc to act->pc. Then NULL + * thr->ptr_curr_pc so that it's not accidentally used with an incorrect + * activation when side effects occur. + */ + duk_hthread_sync_and_null_currpc(thr); + DUK_ASSERT(thr->ptr_curr_pc == NULL); + + DUK_DD(DUK_DDPRINT("duk__handle_call_raw: thr=%p, idx_func=%ld, " + "call_flags=0x%08lx (constructor=%ld), " + "valstack_top=%ld, idx_func=%ld, idx_args=%ld, rec_depth=%ld/%ld, " + "entry_valstack_bottom_byteoff=%ld, entry_valstack_end_byteoff=%ld, " + "entry_call_recursion_depth=%ld, " + "entry_curr_thread=%p, entry_thread_state=%ld", + (void *) thr, + (long) idx_func, + (unsigned long) call_flags, + (long) ((call_flags & DUK_CALL_FLAG_CONSTRUCT) != 0 ? 1 : 0), + (long) duk_get_top(thr), + (long) idx_func, + (long) (idx_func + 2), + (long) thr->heap->call_recursion_depth, + (long) thr->heap->call_recursion_limit, + (long) entry_valstack_bottom_byteoff, + (long) entry_valstack_end_byteoff, + (long) entry_call_recursion_depth, + (void *) entry_curr_thread, + (long) entry_thread_state)); + + /* + * Thread state check and book-keeping. + */ + + duk__call_thread_state_update(thr); + + /* + * Resolve final target function; handle bound functions and special + * functions like .call() and .apply(). Also figure out the effective + * 'this' binding, which replaces the current value at idx_func + 1. + */ + + if (DUK_LIKELY(duk__resolve_target_fastpath_check(thr, idx_func, &func, call_flags) != 0U)) { + DUK_DDD(DUK_DDDPRINT("fast path target resolve")); + } else { + DUK_DDD(DUK_DDDPRINT("slow path target resolve")); + func = duk__resolve_target_func_and_this_binding(thr, idx_func, &call_flags); + } + DUK_ASSERT(duk_get_top(thr) - idx_func >= 2); /* at least func and this present */ + + DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUNDFUNC(func)); + DUK_ASSERT(func == NULL || (DUK_HOBJECT_IS_COMPFUNC(func) || + DUK_HOBJECT_IS_NATFUNC(func))); + + /* [ ... func this arg1 ... argN ] */ + + /* + * Setup a preliminary activation and figure out nargs/nregs and + * value stack minimum size. + * + * Don't touch valstack_bottom or valstack_top yet so that Duktape API + * calls work normally. + * + * Because 'act' is not zeroed, all fields must be filled in. + */ + + /* Should not be necessary, but initialize to silence warnings. */ + act = NULL; + nargs = 0; + nregs = 0; + vs_min_bytes = 0; + +#if defined(DUK_USE_TAILCALL) + use_tailcall = (call_flags & DUK_CALL_FLAG_TAILCALL); + if (use_tailcall) { + use_tailcall = duk__call_setup_act_attempt_tailcall(thr, + call_flags, + idx_func, + func, + entry_valstack_bottom_byteoff, + entry_valstack_end_byteoff, + &nargs, + &nregs, + &vs_min_bytes, + &act); + } +#else + DUK_ASSERT((call_flags & DUK_CALL_FLAG_TAILCALL) == 0); /* compiler ensures this */ + use_tailcall = 0; +#endif + + if (use_tailcall) { + idx_args = 0; + DUK_STATS_INC(thr->heap, stats_call_tailcall); + } else { + duk__call_setup_act_not_tailcall(thr, + call_flags, + idx_func, + func, + entry_valstack_bottom_byteoff, + entry_valstack_end_byteoff, + &nargs, + &nregs, + &vs_min_bytes, + &act); + idx_args = idx_func + 2; + } + /* After this point idx_func is no longer valid for tailcalls. */ + + DUK_ASSERT(act != NULL); + + /* [ ... func this arg1 ... argN ] */ + + /* + * Environment record creation and 'arguments' object creation. + * Named function expression name binding is handled by the + * compiler; the compiled function's parent env will contain + * the (immutable) binding already. + * + * This handling is now identical for C and ECMAScript functions. + * C functions always have the 'NEWENV' flag set, so their + * environment record initialization is delayed (which is good). + * + * Delayed creation (on demand) is handled in duk_js_var.c. + */ + + duk__call_env_setup(thr, func, act, idx_args); + + /* [ ... func this arg1 ... argN ] */ + + /* + * Setup value stack: clamp to 'nargs', fill up to 'nregs', + * ensure value stack size matches target requirements, and + * switch value stack bottom. Valstack top is kept. + * + * Value stack can only grow here. + */ + + duk_valstack_grow_check_throw(thr, vs_min_bytes); + act->reserve_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack); + + if (use_tailcall) { + DUK_ASSERT(nregs >= 0); + DUK_ASSERT(nregs >= nargs); + duk_set_top_and_wipe(thr, nregs, nargs); + } else { + if (nregs >= 0) { + DUK_ASSERT(nregs >= nargs); + duk_set_top_and_wipe(thr, idx_func + 2 + nregs, idx_func + 2 + nargs); + } else { + ; + } + thr->valstack_bottom = thr->valstack_bottom + idx_func + 2; + } + DUK_ASSERT(thr->valstack_bottom >= thr->valstack); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_top); + + /* + * Make the actual call. For Ecma-to-Ecma calls detect that + * setup is complete, then return with a status code that allows + * the caller to reuse the running executor. + */ + + if (func != NULL && DUK_HOBJECT_IS_COMPFUNC(func)) { + /* + * ECMAScript call. + */ + + DUK_ASSERT(func != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(func)); + act->curr_pc = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, (duk_hcompfunc *) func); + + if (call_flags & DUK_CALL_FLAG_ALLOW_ECMATOECMA) { + DUK_DD(DUK_DDPRINT("avoid native call, use existing executor")); + DUK_STATS_INC(thr->heap, stats_call_ecmatoecma); + DUK_ASSERT((act->flags & DUK_ACT_FLAG_PREVENT_YIELD) == 0); + DUK_REFZERO_CHECK_FAST(thr); + DUK_ASSERT(thr->ptr_curr_pc == NULL); + return 1; /* 1=reuse executor */ + } + DUK_ASSERT(use_tailcall == 0); + + /* duk_hthread_activation_unwind_norz() will decrease this on unwind */ + DUK_ASSERT((act->flags & DUK_ACT_FLAG_PREVENT_YIELD) == 0); + act->flags |= DUK_ACT_FLAG_PREVENT_YIELD; + thr->callstack_preventcount++; + + /* XXX: we could just do this on entry regardless of reuse, as long + * as recursion depth is decreased for e2e case. + */ + duk__call_c_recursion_limit_check(thr); + thr->heap->call_recursion_depth++; + + /* [ ... func this | arg1 ... argN ] ('this' must precede new bottom) */ + + /* + * Bytecode executor call. + * + * Execute bytecode, handling any recursive function calls and + * thread resumptions. Returns when execution would return from + * the entry level activation. When the executor returns, a + * single return value is left on the stack top. + * + * The only possible longjmp() is an error (DUK_LJ_TYPE_THROW), + * other types are handled internally by the executor. + */ + + /* thr->ptr_curr_pc is set by bytecode executor early on entry */ + DUK_ASSERT(thr->ptr_curr_pc == NULL); + DUK_DDD(DUK_DDDPRINT("entering bytecode execution")); + duk_js_execute_bytecode(thr); + DUK_DDD(DUK_DDDPRINT("returned from bytecode execution")); + } else { + /* + * Native call. + */ + + DUK_ASSERT(func == NULL || ((duk_hnatfunc *) func)->func != NULL); + DUK_ASSERT(use_tailcall == 0); + + /* [ ... func this | arg1 ... argN ] ('this' must precede new bottom) */ + + /* duk_hthread_activation_unwind_norz() will decrease this on unwind */ + DUK_ASSERT((act->flags & DUK_ACT_FLAG_PREVENT_YIELD) == 0); + act->flags |= DUK_ACT_FLAG_PREVENT_YIELD; + thr->callstack_preventcount++; + + /* XXX: we could just do this on entry regardless of reuse, as long + * as recursion depth is decreased for e2e case. + */ + duk__call_c_recursion_limit_check(thr); + thr->heap->call_recursion_depth++; + + /* For native calls must be NULL so we don't sync back */ + DUK_ASSERT(thr->ptr_curr_pc == NULL); + + /* XXX: native funcptr could come out of call setup. */ + if (func) { + rc = ((duk_hnatfunc *) func)->func(thr); + } else { + duk_tval *tv_func; + duk_c_function funcptr; + + tv_func = &act->tv_func; + DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv_func)); + funcptr = DUK_TVAL_GET_LIGHTFUNC_FUNCPTR(tv_func); + rc = funcptr(thr); + } + + /* Automatic error throwing, retval check. */ + + if (rc == 0) { + DUK_ASSERT(thr->valstack < thr->valstack_end); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); + thr->valstack_top++; + } else if (rc == 1) { + ; + } else if (rc < 0) { + duk_error_throw_from_negative_rc(thr, rc); + DUK_WO_NORETURN(return 0;); + } else { + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_CFUNC_RC); + DUK_WO_NORETURN(return 0;); + } + } + DUK_ASSERT(thr->ptr_curr_pc == NULL); + DUK_ASSERT(use_tailcall == 0); + + /* + * Constructor call post processing. + */ + +#if defined(DUK_USE_ES6_PROXY) + if (call_flags & (DUK_CALL_FLAG_CONSTRUCT | DUK_CALL_FLAG_CONSTRUCT_PROXY)) { + duk_call_construct_postprocess(thr, call_flags & DUK_CALL_FLAG_CONSTRUCT_PROXY); + } +#else + if (call_flags & DUK_CALL_FLAG_CONSTRUCT) { + duk_call_construct_postprocess(thr, 0); + } +#endif + + /* + * Unwind, restore valstack bottom and other book-keeping. + */ + + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_curr->parent == entry_act); + DUK_ASSERT(thr->callstack_top == entry_callstack_top + 1); + duk_hthread_activation_unwind_norz(thr); + DUK_ASSERT(thr->callstack_curr == entry_act); + DUK_ASSERT(thr->callstack_top == entry_callstack_top); + + thr->valstack_bottom = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + entry_valstack_bottom_byteoff); + /* keep current valstack_top */ + DUK_ASSERT(thr->valstack_bottom >= thr->valstack); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_top); + DUK_ASSERT(thr->valstack_top - thr->valstack_bottom >= idx_func + 1); + + /* Return value handling. */ + + /* [ ... func this (crud) retval ] */ + + { + duk_tval *tv_ret; + duk_tval *tv_funret; + + tv_ret = thr->valstack_bottom + idx_func; + tv_funret = thr->valstack_top - 1; +#if defined(DUK_USE_FASTINT) + /* Explicit check for fastint downgrade. */ + DUK_TVAL_CHKFAST_INPLACE_FAST(tv_funret); +#endif + DUK_TVAL_SET_TVAL_UPDREF(thr, tv_ret, tv_funret); /* side effects */ + } + + duk_set_top_unsafe(thr, idx_func + 1); + + /* [ ... retval ] */ + + /* Restore caller's value stack reserve (cannot fail). */ + DUK_ASSERT((duk_uint8_t *) thr->valstack + entry_valstack_end_byteoff >= (duk_uint8_t *) thr->valstack_top); + DUK_ASSERT((duk_uint8_t *) thr->valstack + entry_valstack_end_byteoff <= (duk_uint8_t *) thr->valstack_alloc_end); + thr->valstack_end = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + entry_valstack_end_byteoff); + + /* XXX: Trial value stack shrink would be OK here, but we'd need + * to prevent side effects of the potential realloc. + */ + + /* Restore entry thread executor curr_pc stack frame pointer. */ + thr->ptr_curr_pc = entry_ptr_curr_pc; + + DUK_HEAP_SWITCH_THREAD(thr->heap, entry_curr_thread); /* may be NULL */ + thr->state = (duk_uint8_t) entry_thread_state; + + /* Disabled assert: triggered with some torture tests. */ +#if 0 + DUK_ASSERT((thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread == NULL) || /* first call */ + (thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread != NULL) || /* other call */ + (thr->state == DUK_HTHREAD_STATE_RUNNING && thr->heap->curr_thread == thr)); /* current thread */ +#endif + + thr->heap->call_recursion_depth = entry_call_recursion_depth; + + /* If the debugger is active we need to force an interrupt so that + * debugger breakpoints are rechecked. This is important for function + * calls caused by side effects (e.g. when doing a DUK_OP_GETPROP), see + * GH-303. Only needed for success path, error path always causes a + * breakpoint recheck in the executor. It would be enough to set this + * only when returning to an ECMAScript activation, but setting the flag + * on every return should have no ill effect. + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (duk_debug_is_attached(thr->heap)) { + DUK_DD(DUK_DDPRINT("returning with debugger enabled, force interrupt")); + DUK_ASSERT(thr->interrupt_counter <= thr->interrupt_init); + thr->interrupt_init -= thr->interrupt_counter; + thr->interrupt_counter = 0; + thr->heap->dbg_force_restart = 1; + } +#endif + +#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) + duk__interrupt_fixup(thr, entry_curr_thread); +#endif + + /* Restored by success path. */ + DUK_ASSERT(thr->heap->call_recursion_depth == entry_call_recursion_depth); + DUK_ASSERT(thr->ptr_curr_pc == entry_ptr_curr_pc); + DUK_ASSERT_LJSTATE_UNSET(thr->heap); + + DUK_REFZERO_CHECK_FAST(thr); + + return 0; /* 0=call handled inline */ +} + +DUK_INTERNAL duk_int_t duk_handle_call_unprotected_nargs(duk_hthread *thr, + duk_idx_t nargs, + duk_small_uint_t call_flags) { + duk_idx_t idx_func; + DUK_ASSERT(duk_get_top(thr) >= nargs + 2); + idx_func = duk_get_top(thr) - (nargs + 2); + DUK_ASSERT(idx_func >= 0); + return duk_handle_call_unprotected(thr, idx_func, call_flags); +} + +DUK_INTERNAL duk_int_t duk_handle_call_unprotected(duk_hthread *thr, + duk_idx_t idx_func, + duk_small_uint_t call_flags) { + DUK_ASSERT(duk_is_valid_index(thr, idx_func)); + DUK_ASSERT(idx_func >= 0); + return duk__handle_call_raw(thr, idx_func, call_flags); +} + +/* + * duk_handle_safe_call(): make a "C protected call" within the + * current activation. + * + * The allowed thread states for making a call are the same as for + * duk_handle_call_protected(). + * + * Even though this call is protected, errors are thrown for insane arguments + * and may result in a fatal error unless there's another protected call which + * catches such errors. + * + * The error handling path should be error free, even for out-of-memory + * errors, to ensure safe sandboxing. (As of Duktape 2.2.0 this is not + * yet the case for environment closing which may run out of memory, see + * XXX notes below.) + */ + +DUK_LOCAL void duk__handle_safe_call_inner(duk_hthread *thr, + duk_safe_call_function func, + void *udata, +#if defined(DUK_USE_ASSERTIONS) + duk_size_t entry_valstack_bottom_byteoff, + duk_size_t entry_callstack_top, +#endif + duk_hthread *entry_curr_thread, + duk_uint_fast8_t entry_thread_state, + duk_idx_t idx_retbase, + duk_idx_t num_stack_rets) { + duk_ret_t rc; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT_CTX_VALID(thr); + + /* + * Thread state check and book-keeping. + */ + + duk__call_thread_state_update(thr); + + /* + * Recursion limit check. + */ + + duk__call_c_recursion_limit_check(thr); + thr->heap->call_recursion_depth++; + + /* + * Make the C call. + */ + + rc = func(thr, udata); + + DUK_DDD(DUK_DDDPRINT("safe_call, func rc=%ld", (long) rc)); + + /* + * Valstack manipulation for results. + */ + + /* we're running inside the caller's activation, so no change in call/catch stack or valstack bottom */ + DUK_ASSERT(thr->callstack_top == entry_callstack_top); + DUK_ASSERT(thr->valstack_bottom >= thr->valstack); + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack) == entry_valstack_bottom_byteoff); + DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); + DUK_ASSERT(thr->valstack_end >= thr->valstack_top); + + if (DUK_UNLIKELY(rc < 0)) { + duk_error_throw_from_negative_rc(thr, rc); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(rc >= 0); + + duk__safe_call_adjust_valstack(thr, idx_retbase, num_stack_rets, rc); /* throws for insane rc */ + + DUK_HEAP_SWITCH_THREAD(thr->heap, entry_curr_thread); /* may be NULL */ + thr->state = (duk_uint8_t) entry_thread_state; +} + +DUK_LOCAL void duk__handle_safe_call_error(duk_hthread *thr, + duk_activation *entry_act, +#if defined(DUK_USE_ASSERTIONS) + duk_size_t entry_callstack_top, +#endif + duk_hthread *entry_curr_thread, + duk_uint_fast8_t entry_thread_state, + duk_idx_t idx_retbase, + duk_idx_t num_stack_rets, + duk_size_t entry_valstack_bottom_byteoff, + duk_jmpbuf *old_jmpbuf_ptr) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT_CTX_VALID(thr); + + /* + * Error during call. The error value is at heap->lj.value1. + * + * The very first thing we do is restore the previous setjmp catcher. + * This means that any error in error handling will propagate outwards + * instead of causing a setjmp() re-entry above. + */ + + DUK_DDD(DUK_DDDPRINT("error caught during protected duk_handle_safe_call()")); + + /* Other longjmp types are handled by executor before propagating + * the error here. + */ + DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_THROW); + DUK_ASSERT_LJSTATE_SET(thr->heap); + + /* Either pointer may be NULL (at entry), so don't assert. */ + thr->heap->lj.jmpbuf_ptr = old_jmpbuf_ptr; + + /* XXX: callstack unwind may now throw an error when closing + * scopes; this is a sandboxing issue, described in: + * https://github.com/svaarala/duktape/issues/476 + */ + /* XXX: "unwind to" primitive? */ + + DUK_ASSERT(thr->callstack_top >= entry_callstack_top); + while (thr->callstack_curr != entry_act) { + DUK_ASSERT(thr->callstack_curr != NULL); + duk_hthread_activation_unwind_norz(thr); + } + DUK_ASSERT(thr->callstack_top == entry_callstack_top); + + /* Switch active thread before any side effects to avoid a + * dangling curr_thread pointer. + */ + DUK_HEAP_SWITCH_THREAD(thr->heap, entry_curr_thread); /* may be NULL */ + thr->state = (duk_uint8_t) entry_thread_state; + + DUK_ASSERT(thr->heap->curr_thread == entry_curr_thread); + DUK_ASSERT(thr->state == entry_thread_state); + + /* Restore valstack bottom. */ + thr->valstack_bottom = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + entry_valstack_bottom_byteoff); + + /* [ ... | (crud) ] */ + + /* XXX: ensure space in valstack (now relies on internal reserve)? */ + duk_push_tval(thr, &thr->heap->lj.value1); + + /* [ ... | (crud) errobj ] */ + + DUK_ASSERT(duk_get_top(thr) >= 1); /* at least errobj must be on stack */ + + duk__safe_call_adjust_valstack(thr, idx_retbase, num_stack_rets, 1); /* 1 = num actual 'return values' */ + + /* [ ... | ] or [ ... | errobj (M * undefined)] where M = num_stack_rets - 1 */ + + /* Reset longjmp state. */ + thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN; + thr->heap->lj.iserror = 0; + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, &thr->heap->lj.value1); + DUK_TVAL_SET_UNDEFINED_UPDREF_NORZ(thr, &thr->heap->lj.value2); + + /* Error handling complete, remove side effect protections. Caller + * will process pending finalizers. + */ +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(thr->heap->error_not_allowed == 1); + thr->heap->error_not_allowed = 0; +#endif + DUK_ASSERT(thr->heap->pf_prevent_count > 0); + thr->heap->pf_prevent_count--; + DUK_DD(DUK_DDPRINT("safe call error handled, pf_prevent_count updated to %ld", (long) thr->heap->pf_prevent_count)); + + /* thr->ptr_curr_pc is restored by + * duk__handle_safe_call_shared_unwind() which is also used for + * success path. + */ +} + +DUK_LOCAL void duk__handle_safe_call_shared_unwind(duk_hthread *thr, + duk_idx_t idx_retbase, + duk_idx_t num_stack_rets, +#if defined(DUK_USE_ASSERTIONS) + duk_size_t entry_callstack_top, +#endif + duk_int_t entry_call_recursion_depth, + duk_hthread *entry_curr_thread, + duk_instr_t **entry_ptr_curr_pc) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT_CTX_VALID(thr); + DUK_UNREF(idx_retbase); + DUK_UNREF(num_stack_rets); + DUK_UNREF(entry_curr_thread); + + DUK_ASSERT(thr->callstack_top == entry_callstack_top); + + /* Restore entry thread executor curr_pc stack frame pointer. + * XXX: would be enough to do in error path only, should nest + * cleanly in success path. + */ + thr->ptr_curr_pc = entry_ptr_curr_pc; + + thr->heap->call_recursion_depth = entry_call_recursion_depth; + + /* stack discipline consistency check */ + DUK_ASSERT(duk_get_top(thr) == idx_retbase + num_stack_rets); + + /* A debugger forced interrupt check is not needed here, as + * problematic safe calls are not caused by side effects. + */ + +#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) + duk__interrupt_fixup(thr, entry_curr_thread); +#endif +} + +DUK_INTERNAL duk_int_t duk_handle_safe_call(duk_hthread *thr, + duk_safe_call_function func, + void *udata, + duk_idx_t num_stack_args, + duk_idx_t num_stack_rets) { + duk_activation *entry_act; + duk_size_t entry_valstack_bottom_byteoff; +#if defined(DUK_USE_ASSERTIONS) + duk_size_t entry_valstack_end_byteoff; + duk_size_t entry_callstack_top; + duk_size_t entry_callstack_preventcount; +#endif + duk_int_t entry_call_recursion_depth; + duk_hthread *entry_curr_thread; + duk_uint_fast8_t entry_thread_state; + duk_instr_t **entry_ptr_curr_pc; + duk_jmpbuf *old_jmpbuf_ptr = NULL; + duk_jmpbuf our_jmpbuf; + duk_idx_t idx_retbase; + duk_int_t retval; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(duk_get_top(thr) >= num_stack_args); /* Caller ensures. */ + + DUK_STATS_INC(thr->heap, stats_safecall_all); + + /* Value stack reserve handling: safe call assumes caller has reserved + * space for nrets (assuming optimal unwind processing). Value stack + * reserve is not stored/restored as for normal calls because a safe + * call conceptually happens in the same activation. + */ + + /* Careful with indices like '-x'; if 'x' is zero, it refers to bottom */ + entry_act = thr->callstack_curr; + entry_valstack_bottom_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack); +#if defined(DUK_USE_ASSERTIONS) + entry_valstack_end_byteoff = (duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack); + entry_callstack_top = thr->callstack_top; + entry_callstack_preventcount = thr->callstack_preventcount; +#endif + entry_call_recursion_depth = thr->heap->call_recursion_depth; + entry_curr_thread = thr->heap->curr_thread; /* may be NULL if first call */ + entry_thread_state = thr->state; + entry_ptr_curr_pc = thr->ptr_curr_pc; /* may be NULL */ + idx_retbase = duk_get_top(thr) - num_stack_args; /* not a valid stack index if num_stack_args == 0 */ + DUK_ASSERT(idx_retbase >= 0); + + DUK_ASSERT((duk_idx_t) (thr->valstack_top - thr->valstack_bottom) >= num_stack_args); /* Caller ensures. */ + DUK_ASSERT((duk_idx_t) (thr->valstack_end - (thr->valstack_bottom + idx_retbase)) >= num_stack_rets); /* Caller ensures. */ + + /* Cannot portably debug print a function pointer, hence 'func' not printed! */ + DUK_DD(DUK_DDPRINT("duk_handle_safe_call: thr=%p, num_stack_args=%ld, num_stack_rets=%ld, " + "valstack_top=%ld, idx_retbase=%ld, rec_depth=%ld/%ld, " + "entry_act=%p, entry_valstack_bottom_byteoff=%ld, entry_call_recursion_depth=%ld, " + "entry_curr_thread=%p, entry_thread_state=%ld", + (void *) thr, + (long) num_stack_args, + (long) num_stack_rets, + (long) duk_get_top(thr), + (long) idx_retbase, + (long) thr->heap->call_recursion_depth, + (long) thr->heap->call_recursion_limit, + (void *) entry_act, + (long) entry_valstack_bottom_byteoff, + (long) entry_call_recursion_depth, + (void *) entry_curr_thread, + (long) entry_thread_state)); + + /* Setjmp catchpoint setup. */ + old_jmpbuf_ptr = thr->heap->lj.jmpbuf_ptr; + thr->heap->lj.jmpbuf_ptr = &our_jmpbuf; + + /* Prevent yields for the duration of the safe call. This only + * matters if the executor makes safe calls to functions that + * yield, this doesn't currently happen. + */ + thr->callstack_preventcount++; + +#if defined(DUK_USE_CPP_EXCEPTIONS) + try { +#else + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr == &our_jmpbuf); + if (DUK_SETJMP(our_jmpbuf.jb) == 0) { + /* Success path. */ +#endif + DUK_DDD(DUK_DDDPRINT("safe_call setjmp catchpoint setup complete")); + + duk__handle_safe_call_inner(thr, + func, + udata, +#if defined(DUK_USE_ASSERTIONS) + entry_valstack_bottom_byteoff, + entry_callstack_top, +#endif + entry_curr_thread, + entry_thread_state, + idx_retbase, + num_stack_rets); + + DUK_STATS_INC(thr->heap, stats_safecall_nothrow); + + /* Either pointer may be NULL (at entry), so don't assert */ + thr->heap->lj.jmpbuf_ptr = old_jmpbuf_ptr; + + /* If calls happen inside the safe call, these are restored by + * whatever calls are made. Reserve cannot decrease. + */ + DUK_ASSERT(thr->callstack_curr == entry_act); + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack) >= entry_valstack_end_byteoff); + + retval = DUK_EXEC_SUCCESS; +#if defined(DUK_USE_CPP_EXCEPTIONS) + } catch (duk_internal_exception &exc) { + DUK_UNREF(exc); +#else + } else { + /* Error path. */ +#endif + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack) >= entry_valstack_end_byteoff); + + DUK_STATS_INC(thr->heap, stats_safecall_throw); + + duk__handle_safe_call_error(thr, + entry_act, +#if defined(DUK_USE_ASSERTIONS) + entry_callstack_top, +#endif + entry_curr_thread, + entry_thread_state, + idx_retbase, + num_stack_rets, + entry_valstack_bottom_byteoff, + old_jmpbuf_ptr); + + retval = DUK_EXEC_ERROR; + } +#if defined(DUK_USE_CPP_EXCEPTIONS) + catch (duk_fatal_exception &exc) { + DUK_D(DUK_DPRINT("rethrow duk_fatal_exception")); + throw; + } catch (std::exception &exc) { + const char *what = exc.what(); + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack) >= entry_valstack_end_byteoff); + DUK_STATS_INC(thr->heap, stats_safecall_throw); + if (!what) { + what = "unknown"; + } + DUK_D(DUK_DPRINT("unexpected c++ std::exception (perhaps thrown by user code)")); + try { + DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "caught invalid c++ std::exception '%s' (perhaps thrown by user code)", what); + DUK_WO_NORETURN(return 0;); + } catch (duk_internal_exception exc) { + DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ std::exception")); + DUK_UNREF(exc); + duk__handle_safe_call_error(thr, + entry_act, +#if defined(DUK_USE_ASSERTIONS) + entry_callstack_top, +#endif + entry_curr_thread, + entry_thread_state, + idx_retbase, + num_stack_rets, + entry_valstack_bottom_byteoff, + old_jmpbuf_ptr); + retval = DUK_EXEC_ERROR; + } + } catch (...) { + DUK_D(DUK_DPRINT("unexpected c++ exception (perhaps thrown by user code)")); + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack) >= entry_valstack_end_byteoff); + DUK_STATS_INC(thr->heap, stats_safecall_throw); + try { + DUK_ERROR_TYPE(thr, "caught invalid c++ exception (perhaps thrown by user code)"); + DUK_WO_NORETURN(return 0;); + } catch (duk_internal_exception exc) { + DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ exception")); + DUK_UNREF(exc); + duk__handle_safe_call_error(thr, + entry_act, +#if defined(DUK_USE_ASSERTIONS) + entry_callstack_top, +#endif + entry_curr_thread, + entry_thread_state, + idx_retbase, + num_stack_rets, + entry_valstack_bottom_byteoff, + old_jmpbuf_ptr); + retval = DUK_EXEC_ERROR; + } + } +#endif + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr == old_jmpbuf_ptr); /* success/error path both do this */ + + DUK_ASSERT_LJSTATE_UNSET(thr->heap); + + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack) >= entry_valstack_end_byteoff); + duk__handle_safe_call_shared_unwind(thr, + idx_retbase, + num_stack_rets, +#if defined(DUK_USE_ASSERTIONS) + entry_callstack_top, +#endif + entry_call_recursion_depth, + entry_curr_thread, + entry_ptr_curr_pc); + + /* Restore preventcount. */ + thr->callstack_preventcount--; + DUK_ASSERT(thr->callstack_preventcount == entry_callstack_preventcount); + + /* Final asserts. */ + DUK_ASSERT(thr->callstack_curr == entry_act); + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_bottom - (duk_uint8_t *) thr->valstack) == entry_valstack_bottom_byteoff); + DUK_ASSERT((duk_size_t) ((duk_uint8_t *) thr->valstack_end - (duk_uint8_t *) thr->valstack) >= entry_valstack_end_byteoff); + DUK_ASSERT(thr->callstack_top == entry_callstack_top); + DUK_ASSERT(thr->heap->call_recursion_depth == entry_call_recursion_depth); + DUK_ASSERT(thr->heap->curr_thread == entry_curr_thread); + DUK_ASSERT(thr->state == entry_thread_state); + DUK_ASSERT(thr->ptr_curr_pc == entry_ptr_curr_pc); + DUK_ASSERT(duk_get_top(thr) == idx_retbase + num_stack_rets); + DUK_ASSERT_LJSTATE_UNSET(thr->heap); + + /* Pending side effects. */ + DUK_REFZERO_CHECK_FAST(thr); + + return retval; +} + +/* + * Property-based call (foo.noSuch()) error setup: replace target function + * on stack top with a specially tagged (hidden Symbol) error which gets + * thrown in call handling at the proper spot to follow ECMAScript semantics. + */ + +#if defined(DUK_USE_VERBOSE_ERRORS) +DUK_INTERNAL DUK_NOINLINE DUK_COLD void duk_call_setup_propcall_error(duk_hthread *thr, duk_tval *tv_targ, duk_tval *tv_base, duk_tval *tv_key) { + const char *str1, *str2, *str3; + duk_idx_t entry_top; + + entry_top = duk_get_top(thr); + + /* Must stabilize pointers first. Argument convention is a bit awkward, + * it comes from the executor call site where some arguments may not be + * on the value stack (consts). + */ + duk_push_tval(thr, tv_base); + duk_push_tval(thr, tv_key); + duk_push_tval(thr, tv_targ); + + DUK_GC_TORTURE(thr->heap); + + /* We only push an error, replacing the call target (at idx_func) + * with the error to ensure side effects come out correctly: + * - Property read + * - Call argument evaluation + * - Callability check and error thrown. + * + * A hidden Symbol on the error object pushed here is used by + * call handling to figure out the error is to be thrown as is. + * It is CRITICAL that the hidden Symbol can never occur on a + * user visible object that may get thrown. + */ + +#if defined(DUK_USE_PARANOID_ERRORS) + str1 = duk_get_type_name(thr, -1); + str2 = duk_get_type_name(thr, -2); + str3 = duk_get_type_name(thr, -3); + duk_push_error_object(thr, DUK_ERR_TYPE_ERROR | DUK_ERRCODE_FLAG_NOBLAME_FILELINE, "%s not callable (property %s of %s)", str1, str2, str3); +#else + str1 = duk_push_string_readable(thr, -1); + str2 = duk_push_string_readable(thr, -3); + str3 = duk_push_string_readable(thr, -5); + duk_push_error_object(thr, DUK_ERR_TYPE_ERROR | DUK_ERRCODE_FLAG_NOBLAME_FILELINE, "%s not callable (property %s of %s)", str1, str2, str3); +#endif + + duk_push_true(thr); + duk_put_prop_stridx(thr, -2, DUK_STRIDX_INT_TARGET); /* Marker property, reuse _Target. */ + + /* [ <nregs> propValue <variable> error ] */ + duk_replace(thr, entry_top - 1); + duk_set_top(thr, entry_top); + + DUK_ASSERT(!duk_is_callable(thr, -1)); /* Critical so that call handling will throw the error. */ +} +#endif /* DUK_USE_VERBOSE_ERRORS */ + +/* automatic undefs */ +#undef DUK__AUGMENT_CALL_RELAX_COUNT +#line 1 "duk_js_compiler.c" +/* + * ECMAScript compiler. + * + * Parses an input string and generates a function template result. + * Compilation may happen in multiple contexts (global code, eval + * code, function code). + * + * The parser uses a traditional top-down recursive parsing for the + * statement level, and an operator precedence based top-down approach + * for the expression level. The attempt is to minimize the C stack + * depth. Bytecode is generated directly without an intermediate + * representation (tree), at the cost of needing two (and sometimes + * three) passes over each function. + * + * The top-down recursive parser functions are named "duk__parse_XXX". + * + * Recursion limits are in key functions to prevent arbitrary C recursion: + * function body parsing, statement parsing, and expression parsing. + * + * See doc/compiler.rst for discussion on the design. + * + * A few typing notes: + * + * - duk_regconst_t: signed, highest bit set (< 0) means constant, + * some call sites use -1 for "none" (equivalent to constant 0x7fffffff) + * - PC values: duk_int_t, negative values used as markers + */ + +/* #include duk_internal.h -> already included */ + +/* If highest bit of a register number is set, it refers to a constant instead. + * When interpreted as a signed value, this means const values are always + * negative (when interpreted as two's complement). For example DUK__ISREG_TEMP() + * uses this approach to avoid an explicit DUK__ISREG() check (the condition is + * logically "'x' is a register AND 'x' >= temp_first"). + */ +#define DUK__CONST_MARKER DUK_REGCONST_CONST_MARKER +#define DUK__REMOVECONST(x) ((x) & ~DUK__CONST_MARKER) +#define DUK__ISREG(x) ((x) >= 0) +#define DUK__ISCONST(x) ((x) < 0) +#define DUK__ISREG_TEMP(comp_ctx,x) ((duk_int32_t) (x) >= (duk_int32_t) ((comp_ctx)->curr_func.temp_first)) /* Check for x >= temp_first && x >= 0 by comparing as signed. */ +#define DUK__ISREG_NOTTEMP(comp_ctx,x) ((duk_uint32_t) (x) < (duk_uint32_t) ((comp_ctx)->curr_func.temp_first)) /* Check for x >= 0 && x < temp_first by interpreting as unsigned. */ +#define DUK__GETTEMP(comp_ctx) ((comp_ctx)->curr_func.temp_next) +#define DUK__SETTEMP(comp_ctx,x) ((comp_ctx)->curr_func.temp_next = (x)) /* dangerous: must only lower (temp_max not updated) */ +#define DUK__SETTEMP_CHECKMAX(comp_ctx,x) duk__settemp_checkmax((comp_ctx),(x)) +#define DUK__ALLOCTEMP(comp_ctx) duk__alloctemp((comp_ctx)) +#define DUK__ALLOCTEMPS(comp_ctx,count) duk__alloctemps((comp_ctx),(count)) + +/* Init value set size for array and object literals. */ +#define DUK__MAX_ARRAY_INIT_VALUES 20 +#define DUK__MAX_OBJECT_INIT_PAIRS 10 + +/* XXX: hack, remove when const lookup is not O(n) */ +#define DUK__GETCONST_MAX_CONSTS_CHECK 256 + +/* These limits are based on bytecode limits. Max temps is limited + * by duk_hcompfunc nargs/nregs fields being 16 bits. + */ +#define DUK__MAX_CONSTS DUK_BC_BC_MAX +#define DUK__MAX_FUNCS DUK_BC_BC_MAX +#define DUK__MAX_TEMPS 0xffffL + +/* Initial bytecode size allocation. */ +#if defined(DUK_USE_PREFER_SIZE) +#define DUK__BC_INITIAL_INSTS 16 +#else +#define DUK__BC_INITIAL_INSTS 256 +#endif + +#define DUK__RECURSION_INCREASE(comp_ctx,thr) do { \ + DUK_DDD(DUK_DDDPRINT("RECURSION INCREASE: %s:%ld", (const char *) DUK_FILE_MACRO, (long) DUK_LINE_MACRO)); \ + duk__comp_recursion_increase((comp_ctx)); \ + } while (0) + +#define DUK__RECURSION_DECREASE(comp_ctx,thr) do { \ + DUK_DDD(DUK_DDDPRINT("RECURSION DECREASE: %s:%ld", (const char *) DUK_FILE_MACRO, (long) DUK_LINE_MACRO)); \ + duk__comp_recursion_decrease((comp_ctx)); \ + } while (0) + +/* Value stack slot limits: these are quite approximate right now, and + * because they overlap in control flow, some could be eliminated. + */ +#define DUK__COMPILE_ENTRY_SLOTS 8 +#define DUK__FUNCTION_INIT_REQUIRE_SLOTS 16 +#define DUK__FUNCTION_BODY_REQUIRE_SLOTS 16 +#define DUK__PARSE_STATEMENTS_SLOTS 16 +#define DUK__PARSE_EXPR_SLOTS 16 + +/* Temporary structure used to pass a stack allocated region through + * duk_safe_call(). + */ +typedef struct { + duk_small_uint_t flags; + duk_compiler_ctx comp_ctx_alloc; + duk_lexer_point lex_pt_alloc; +} duk__compiler_stkstate; + +/* + * Prototypes + */ + +/* lexing */ +DUK_LOCAL_DECL void duk__advance_helper(duk_compiler_ctx *comp_ctx, duk_small_int_t expect); +DUK_LOCAL_DECL void duk__advance_expect(duk_compiler_ctx *comp_ctx, duk_small_int_t expect); +DUK_LOCAL_DECL void duk__advance(duk_compiler_ctx *ctx); + +/* function helpers */ +DUK_LOCAL_DECL void duk__init_func_valstack_slots(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL void duk__reset_func_for_pass2(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL void duk__init_varmap_and_prologue_for_pass2(duk_compiler_ctx *comp_ctx, duk_regconst_t *out_stmt_value_reg); +DUK_LOCAL_DECL void duk__convert_to_func_template(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL duk_int_t duk__cleanup_varmap(duk_compiler_ctx *comp_ctx); + +/* code emission */ +DUK_LOCAL_DECL duk_int_t duk__get_current_pc(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL duk_compiler_instr *duk__get_instr_ptr(duk_compiler_ctx *comp_ctx, duk_int_t pc); +DUK_LOCAL_DECL void duk__emit(duk_compiler_ctx *comp_ctx, duk_instr_t ins); +DUK_LOCAL_DECL void duk__emit_op_only(duk_compiler_ctx *comp_ctx, duk_small_uint_t op); +DUK_LOCAL_DECL void duk__emit_a_b_c(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a, duk_regconst_t b, duk_regconst_t c); +DUK_LOCAL_DECL void duk__emit_a_b(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a, duk_regconst_t b); +DUK_LOCAL_DECL void duk__emit_b_c(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t b, duk_regconst_t c); +#if 0 /* unused */ +DUK_LOCAL_DECL void duk__emit_a(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a); +DUK_LOCAL_DECL void duk__emit_b(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t b); +#endif +DUK_LOCAL_DECL void duk__emit_a_bc(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a, duk_regconst_t bc); +DUK_LOCAL_DECL void duk__emit_bc(duk_compiler_ctx *comp_ctx, duk_small_uint_t op, duk_regconst_t bc); +DUK_LOCAL_DECL void duk__emit_abc(duk_compiler_ctx *comp_ctx, duk_small_uint_t op, duk_regconst_t abc); +DUK_LOCAL_DECL void duk__emit_load_int32(duk_compiler_ctx *comp_ctx, duk_regconst_t reg, duk_int32_t val); +DUK_LOCAL_DECL void duk__emit_load_int32_noshuffle(duk_compiler_ctx *comp_ctx, duk_regconst_t reg, duk_int32_t val); +DUK_LOCAL_DECL void duk__emit_jump(duk_compiler_ctx *comp_ctx, duk_int_t target_pc); +DUK_LOCAL_DECL duk_int_t duk__emit_jump_empty(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL void duk__insert_jump_entry(duk_compiler_ctx *comp_ctx, duk_int_t jump_pc); +DUK_LOCAL_DECL void duk__patch_jump(duk_compiler_ctx *comp_ctx, duk_int_t jump_pc, duk_int_t target_pc); +DUK_LOCAL_DECL void duk__patch_jump_here(duk_compiler_ctx *comp_ctx, duk_int_t jump_pc); +DUK_LOCAL_DECL void duk__patch_trycatch(duk_compiler_ctx *comp_ctx, duk_int_t ldconst_pc, duk_int_t trycatch_pc, duk_regconst_t reg_catch, duk_regconst_t const_varname, duk_small_uint_t flags); +DUK_LOCAL_DECL void duk__emit_if_false_skip(duk_compiler_ctx *comp_ctx, duk_regconst_t regconst); +DUK_LOCAL_DECL void duk__emit_if_true_skip(duk_compiler_ctx *comp_ctx, duk_regconst_t regconst); +DUK_LOCAL_DECL void duk__emit_invalid(duk_compiler_ctx *comp_ctx); + +/* ivalue/ispec helpers */ +DUK_LOCAL_DECL void duk__ivalue_regconst(duk_ivalue *x, duk_regconst_t regconst); +DUK_LOCAL_DECL void duk__ivalue_plain_fromstack(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +DUK_LOCAL_DECL void duk__ivalue_var_fromstack(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +DUK_LOCAL_DECL void duk__ivalue_var_hstring(duk_compiler_ctx *comp_ctx, duk_ivalue *x, duk_hstring *h); +DUK_LOCAL_DECL void duk__copy_ispec(duk_compiler_ctx *comp_ctx, duk_ispec *src, duk_ispec *dst); +DUK_LOCAL_DECL void duk__copy_ivalue(duk_compiler_ctx *comp_ctx, duk_ivalue *src, duk_ivalue *dst); +DUK_LOCAL_DECL duk_regconst_t duk__alloctemps(duk_compiler_ctx *comp_ctx, duk_small_int_t num); +DUK_LOCAL_DECL duk_regconst_t duk__alloctemp(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL void duk__settemp_checkmax(duk_compiler_ctx *comp_ctx, duk_regconst_t temp_next); +DUK_LOCAL_DECL duk_regconst_t duk__getconst(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL +duk_regconst_t duk__ispec_toregconst_raw(duk_compiler_ctx *comp_ctx, + duk_ispec *x, + duk_regconst_t forced_reg, + duk_small_uint_t flags); +DUK_LOCAL_DECL void duk__ispec_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ispec *x, duk_regconst_t forced_reg); +DUK_LOCAL_DECL void duk__ivalue_toplain_raw(duk_compiler_ctx *comp_ctx, duk_ivalue *x, duk_regconst_t forced_reg); +DUK_LOCAL_DECL void duk__ivalue_toplain(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +DUK_LOCAL_DECL void duk__ivalue_toplain_ignore(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +DUK_LOCAL_DECL +duk_regconst_t duk__ivalue_toregconst_raw(duk_compiler_ctx *comp_ctx, + duk_ivalue *x, + duk_regconst_t forced_reg, + duk_small_uint_t flags); +DUK_LOCAL_DECL duk_regconst_t duk__ivalue_toreg(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +#if 0 /* unused */ +DUK_LOCAL_DECL duk_regconst_t duk__ivalue_totemp(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +#endif +DUK_LOCAL_DECL void duk__ivalue_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ivalue *x, duk_int_t forced_reg); +DUK_LOCAL_DECL duk_regconst_t duk__ivalue_toregconst(duk_compiler_ctx *comp_ctx, duk_ivalue *x); +DUK_LOCAL_DECL duk_regconst_t duk__ivalue_totempconst(duk_compiler_ctx *comp_ctx, duk_ivalue *x); + +/* identifier handling */ +DUK_LOCAL_DECL duk_regconst_t duk__lookup_active_register_binding(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL duk_bool_t duk__lookup_lhs(duk_compiler_ctx *ctx, duk_regconst_t *out_reg_varbind, duk_regconst_t *out_rc_varname); + +/* label handling */ +DUK_LOCAL_DECL void duk__add_label(duk_compiler_ctx *comp_ctx, duk_hstring *h_label, duk_int_t pc_label, duk_int_t label_id); +DUK_LOCAL_DECL void duk__update_label_flags(duk_compiler_ctx *comp_ctx, duk_int_t label_id, duk_small_uint_t flags); +DUK_LOCAL_DECL void duk__lookup_active_label(duk_compiler_ctx *comp_ctx, duk_hstring *h_label, duk_bool_t is_break, duk_int_t *out_label_id, duk_int_t *out_label_catch_depth, duk_int_t *out_label_pc, duk_bool_t *out_is_closest); +DUK_LOCAL_DECL void duk__reset_labels_to_length(duk_compiler_ctx *comp_ctx, duk_size_t len); + +/* top-down expression parser */ +DUK_LOCAL_DECL void duk__expr_nud(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__expr_led(duk_compiler_ctx *comp_ctx, duk_ivalue *left, duk_ivalue *res); +DUK_LOCAL_DECL duk_small_uint_t duk__expr_lbp(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL duk_bool_t duk__expr_is_empty(duk_compiler_ctx *comp_ctx); + +/* exprtop is the top level variant which resets nud/led counts */ +DUK_LOCAL_DECL void duk__expr(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +DUK_LOCAL_DECL void duk__exprtop(duk_compiler_ctx *ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); + +/* convenience helpers */ +#if 0 /* unused */ +DUK_LOCAL_DECL duk_regconst_t duk__expr_toreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#endif +#if 0 /* unused */ +DUK_LOCAL_DECL duk_regconst_t duk__expr_totemp(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#endif +DUK_LOCAL_DECL void duk__expr_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags, duk_regconst_t forced_reg); +DUK_LOCAL_DECL duk_regconst_t duk__expr_toregconst(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#if 0 /* unused */ +DUK_LOCAL_DECL duk_regconst_t duk__expr_totempconst(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#endif +DUK_LOCAL_DECL void duk__expr_toplain(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +DUK_LOCAL_DECL void duk__expr_toplain_ignore(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +DUK_LOCAL_DECL duk_regconst_t duk__exprtop_toreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#if 0 /* unused */ +DUK_LOCAL_DECL duk_regconst_t duk__exprtop_totemp(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#endif +DUK_LOCAL_DECL void duk__exprtop_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags, duk_regconst_t forced_reg); +DUK_LOCAL_DECL duk_regconst_t duk__exprtop_toregconst(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#if 0 /* unused */ +DUK_LOCAL_DECL void duk__exprtop_toplain_ignore(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags); +#endif + +/* expression parsing helpers */ +DUK_LOCAL_DECL duk_int_t duk__parse_arguments(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__nud_array_literal(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__nud_object_literal(duk_compiler_ctx *comp_ctx, duk_ivalue *res); + +/* statement parsing */ +DUK_LOCAL_DECL void duk__parse_var_decl(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t expr_flags, duk_regconst_t *out_reg_varbind, duk_regconst_t *out_rc_varname); +DUK_LOCAL_DECL void duk__parse_var_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t expr_flags); +DUK_LOCAL_DECL void duk__parse_for_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site); +DUK_LOCAL_DECL void duk__parse_switch_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site); +DUK_LOCAL_DECL void duk__parse_if_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__parse_do_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site); +DUK_LOCAL_DECL void duk__parse_while_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site); +DUK_LOCAL_DECL void duk__parse_break_or_continue_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__parse_return_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__parse_throw_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__parse_try_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__parse_with_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res); +DUK_LOCAL_DECL void duk__parse_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_bool_t allow_source_elem); +DUK_LOCAL_DECL duk_int_t duk__stmt_label_site(duk_compiler_ctx *comp_ctx, duk_int_t label_id); +DUK_LOCAL_DECL void duk__parse_stmts(duk_compiler_ctx *comp_ctx, duk_bool_t allow_source_elem, duk_bool_t expect_eof, duk_bool_t regexp_after); + +DUK_LOCAL_DECL void duk__parse_func_body(duk_compiler_ctx *comp_ctx, duk_bool_t expect_eof, duk_bool_t implicit_return_value, duk_bool_t regexp_after, duk_small_int_t expect_token); +DUK_LOCAL_DECL void duk__parse_func_formals(duk_compiler_ctx *comp_ctx); +DUK_LOCAL_DECL void duk__parse_func_like_raw(duk_compiler_ctx *comp_ctx, duk_small_uint_t flags); +DUK_LOCAL_DECL duk_int_t duk__parse_func_like_fnum(duk_compiler_ctx *comp_ctx, duk_small_uint_t flags); + +#define DUK__FUNC_FLAG_DECL (1 << 0) /* Parsing a function declaration. */ +#define DUK__FUNC_FLAG_GETSET (1 << 1) /* Parsing an object literal getter/setter. */ +#define DUK__FUNC_FLAG_METDEF (1 << 2) /* Parsing an object literal method definition shorthand. */ +#define DUK__FUNC_FLAG_PUSHNAME_PASS1 (1 << 3) /* Push function name when creating template (first pass only). */ +#define DUK__FUNC_FLAG_USE_PREVTOKEN (1 << 4) /* Use prev_token to start function parsing (workaround for object literal). */ + +/* + * Parser control values for tokens. The token table is ordered by the + * DUK_TOK_XXX defines. + * + * The binding powers are for lbp() use (i.e. for use in led() context). + * Binding powers are positive for typing convenience, and bits at the + * top should be reserved for flags. Binding power step must be higher + * than 1 so that binding power "lbp - 1" can be used for right associative + * operators. Currently a step of 2 is used (which frees one more bit for + * flags). + */ + +/* XXX: actually single step levels would work just fine, clean up */ + +/* binding power "levels" (see doc/compiler.rst) */ +#define DUK__BP_INVALID 0 /* always terminates led() */ +#define DUK__BP_EOF 2 +#define DUK__BP_CLOSING 4 /* token closes expression, e.g. ')', ']' */ +#define DUK__BP_FOR_EXPR DUK__BP_CLOSING /* bp to use when parsing a top level Expression */ +#define DUK__BP_COMMA 6 +#define DUK__BP_ASSIGNMENT 8 +#define DUK__BP_CONDITIONAL 10 +#define DUK__BP_LOR 12 +#define DUK__BP_LAND 14 +#define DUK__BP_BOR 16 +#define DUK__BP_BXOR 18 +#define DUK__BP_BAND 20 +#define DUK__BP_EQUALITY 22 +#define DUK__BP_RELATIONAL 24 +#define DUK__BP_SHIFT 26 +#define DUK__BP_ADDITIVE 28 +#define DUK__BP_MULTIPLICATIVE 30 +#define DUK__BP_EXPONENTIATION 32 +#define DUK__BP_POSTFIX 34 +#define DUK__BP_CALL 36 +#define DUK__BP_MEMBER 38 + +#define DUK__TOKEN_LBP_BP_MASK 0x1f +#define DUK__TOKEN_LBP_FLAG_NO_REGEXP (1 << 5) /* regexp literal must not follow this token */ +#define DUK__TOKEN_LBP_FLAG_TERMINATES (1 << 6) /* terminates expression; e.g. post-increment/-decrement */ +#define DUK__TOKEN_LBP_FLAG_UNUSED (1 << 7) /* unused */ + +#define DUK__TOKEN_LBP_GET_BP(x) ((duk_small_uint_t) (((x) & DUK__TOKEN_LBP_BP_MASK) * 2)) + +#define DUK__MK_LBP(bp) ((bp) >> 1) /* bp is assumed to be even */ +#define DUK__MK_LBP_FLAGS(bp,flags) (((bp) >> 1) | (flags)) + +DUK_LOCAL const duk_uint8_t duk__token_lbp[] = { + DUK__MK_LBP(DUK__BP_EOF), /* DUK_TOK_EOF */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_IDENTIFIER */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_BREAK */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_CASE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_CATCH */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_CONTINUE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_DEBUGGER */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_DEFAULT */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_DELETE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_DO */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_ELSE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_FINALLY */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_FOR */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_FUNCTION */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_IF */ + DUK__MK_LBP(DUK__BP_RELATIONAL), /* DUK_TOK_IN */ + DUK__MK_LBP(DUK__BP_RELATIONAL), /* DUK_TOK_INSTANCEOF */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_NEW */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_RETURN */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_SWITCH */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_THIS */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_THROW */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_TRY */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_TYPEOF */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_VAR */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_CONST */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_VOID */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_WHILE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_WITH */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_CLASS */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_ENUM */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_EXPORT */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_EXTENDS */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_IMPORT */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_SUPER */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_NULL */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_TRUE */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_FALSE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_GET */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_SET */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_IMPLEMENTS */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_INTERFACE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_LET */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_PACKAGE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_PRIVATE */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_PROTECTED */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_PUBLIC */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_STATIC */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_YIELD */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_LCURLY */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_RCURLY */ + DUK__MK_LBP(DUK__BP_MEMBER), /* DUK_TOK_LBRACKET */ + DUK__MK_LBP_FLAGS(DUK__BP_CLOSING, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_RBRACKET */ + DUK__MK_LBP(DUK__BP_CALL), /* DUK_TOK_LPAREN */ + DUK__MK_LBP_FLAGS(DUK__BP_CLOSING, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_RPAREN */ + DUK__MK_LBP(DUK__BP_MEMBER), /* DUK_TOK_PERIOD */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_SEMICOLON */ + DUK__MK_LBP(DUK__BP_COMMA), /* DUK_TOK_COMMA */ + DUK__MK_LBP(DUK__BP_RELATIONAL), /* DUK_TOK_LT */ + DUK__MK_LBP(DUK__BP_RELATIONAL), /* DUK_TOK_GT */ + DUK__MK_LBP(DUK__BP_RELATIONAL), /* DUK_TOK_LE */ + DUK__MK_LBP(DUK__BP_RELATIONAL), /* DUK_TOK_GE */ + DUK__MK_LBP(DUK__BP_EQUALITY), /* DUK_TOK_EQ */ + DUK__MK_LBP(DUK__BP_EQUALITY), /* DUK_TOK_NEQ */ + DUK__MK_LBP(DUK__BP_EQUALITY), /* DUK_TOK_SEQ */ + DUK__MK_LBP(DUK__BP_EQUALITY), /* DUK_TOK_SNEQ */ + DUK__MK_LBP(DUK__BP_ADDITIVE), /* DUK_TOK_ADD */ + DUK__MK_LBP(DUK__BP_ADDITIVE), /* DUK_TOK_SUB */ + DUK__MK_LBP(DUK__BP_MULTIPLICATIVE), /* DUK_TOK_MUL */ + DUK__MK_LBP(DUK__BP_MULTIPLICATIVE), /* DUK_TOK_DIV */ + DUK__MK_LBP(DUK__BP_MULTIPLICATIVE), /* DUK_TOK_MOD */ + DUK__MK_LBP(DUK__BP_EXPONENTIATION), /* DUK_TOK_EXP */ + DUK__MK_LBP(DUK__BP_POSTFIX), /* DUK_TOK_INCREMENT */ + DUK__MK_LBP(DUK__BP_POSTFIX), /* DUK_TOK_DECREMENT */ + DUK__MK_LBP(DUK__BP_SHIFT), /* DUK_TOK_ALSHIFT */ + DUK__MK_LBP(DUK__BP_SHIFT), /* DUK_TOK_ARSHIFT */ + DUK__MK_LBP(DUK__BP_SHIFT), /* DUK_TOK_RSHIFT */ + DUK__MK_LBP(DUK__BP_BAND), /* DUK_TOK_BAND */ + DUK__MK_LBP(DUK__BP_BOR), /* DUK_TOK_BOR */ + DUK__MK_LBP(DUK__BP_BXOR), /* DUK_TOK_BXOR */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_LNOT */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_BNOT */ + DUK__MK_LBP(DUK__BP_LAND), /* DUK_TOK_LAND */ + DUK__MK_LBP(DUK__BP_LOR), /* DUK_TOK_LOR */ + DUK__MK_LBP(DUK__BP_CONDITIONAL), /* DUK_TOK_QUESTION */ + DUK__MK_LBP(DUK__BP_INVALID), /* DUK_TOK_COLON */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_EQUALSIGN */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_ADD_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_SUB_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_MUL_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_DIV_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_MOD_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_EXP_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_ALSHIFT_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_ARSHIFT_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_RSHIFT_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_BAND_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_BOR_EQ */ + DUK__MK_LBP(DUK__BP_ASSIGNMENT), /* DUK_TOK_BXOR_EQ */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_NUMBER */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_STRING */ + DUK__MK_LBP_FLAGS(DUK__BP_INVALID, DUK__TOKEN_LBP_FLAG_NO_REGEXP), /* DUK_TOK_REGEXP */ +}; + +/* + * Misc helpers + */ + +DUK_LOCAL void duk__comp_recursion_increase(duk_compiler_ctx *comp_ctx) { + DUK_ASSERT(comp_ctx != NULL); + DUK_ASSERT(comp_ctx->recursion_depth >= 0); + if (comp_ctx->recursion_depth >= comp_ctx->recursion_limit) { + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_COMPILER_RECURSION_LIMIT); + DUK_WO_NORETURN(return;); + } + comp_ctx->recursion_depth++; +} + +DUK_LOCAL void duk__comp_recursion_decrease(duk_compiler_ctx *comp_ctx) { + DUK_ASSERT(comp_ctx != NULL); + DUK_ASSERT(comp_ctx->recursion_depth > 0); + comp_ctx->recursion_depth--; +} + +DUK_LOCAL duk_bool_t duk__hstring_is_eval_or_arguments(duk_compiler_ctx *comp_ctx, duk_hstring *h) { + DUK_UNREF(comp_ctx); + DUK_ASSERT(h != NULL); + return DUK_HSTRING_HAS_EVAL_OR_ARGUMENTS(h); +} + +DUK_LOCAL duk_bool_t duk__hstring_is_eval_or_arguments_in_strict_mode(duk_compiler_ctx *comp_ctx, duk_hstring *h) { + DUK_ASSERT(h != NULL); + return (comp_ctx->curr_func.is_strict && + DUK_HSTRING_HAS_EVAL_OR_ARGUMENTS(h)); +} + +/* + * Parser duk__advance() token eating functions + */ + +/* XXX: valstack handling is awkward. Add a valstack helper which + * avoids dup():ing; valstack_copy(src, dst)? + */ + +DUK_LOCAL void duk__advance_helper(duk_compiler_ctx *comp_ctx, duk_small_int_t expect) { + duk_hthread *thr = comp_ctx->thr; + duk_bool_t regexp; + + DUK_ASSERT_DISABLE(comp_ctx->curr_token.t >= 0); /* unsigned */ + DUK_ASSERT(comp_ctx->curr_token.t <= DUK_TOK_MAXVAL); /* MAXVAL is inclusive */ + + /* + * Use current token to decide whether a RegExp can follow. + * + * We can use either 't' or 't_nores'; the latter would not + * recognize keywords. Some keywords can be followed by a + * RegExp (e.g. "return"), so using 't' is better. This is + * not trivial, see doc/compiler.rst. + */ + + regexp = 1; + if (duk__token_lbp[comp_ctx->curr_token.t] & DUK__TOKEN_LBP_FLAG_NO_REGEXP) { + regexp = 0; + } + if (comp_ctx->curr_func.reject_regexp_in_adv) { + comp_ctx->curr_func.reject_regexp_in_adv = 0; + regexp = 0; + } + if (comp_ctx->curr_func.allow_regexp_in_adv) { + comp_ctx->curr_func.allow_regexp_in_adv = 0; + regexp = 1; + } + + if (expect >= 0 && comp_ctx->curr_token.t != (duk_small_uint_t) expect) { + DUK_D(DUK_DPRINT("parse error: expect=%ld, got=%ld", + (long) expect, (long) comp_ctx->curr_token.t)); + DUK_ERROR_SYNTAX(thr, DUK_STR_PARSE_ERROR); + DUK_WO_NORETURN(return;); + } + + /* make current token the previous; need to fiddle with valstack "backing store" */ + duk_memcpy(&comp_ctx->prev_token, &comp_ctx->curr_token, sizeof(duk_token)); + duk_copy(thr, comp_ctx->tok11_idx, comp_ctx->tok21_idx); + duk_copy(thr, comp_ctx->tok12_idx, comp_ctx->tok22_idx); + + /* parse new token */ + duk_lexer_parse_js_input_element(&comp_ctx->lex, + &comp_ctx->curr_token, + comp_ctx->curr_func.is_strict, + regexp); + + DUK_DDD(DUK_DDDPRINT("advance: curr: tok=%ld/%ld,%ld,term=%ld,%!T,%!T " + "prev: tok=%ld/%ld,%ld,term=%ld,%!T,%!T", + (long) comp_ctx->curr_token.t, + (long) comp_ctx->curr_token.t_nores, + (long) comp_ctx->curr_token.start_line, + (long) comp_ctx->curr_token.lineterm, + (duk_tval *) duk_get_tval(thr, comp_ctx->tok11_idx), + (duk_tval *) duk_get_tval(thr, comp_ctx->tok12_idx), + (long) comp_ctx->prev_token.t, + (long) comp_ctx->prev_token.t_nores, + (long) comp_ctx->prev_token.start_line, + (long) comp_ctx->prev_token.lineterm, + (duk_tval *) duk_get_tval(thr, comp_ctx->tok21_idx), + (duk_tval *) duk_get_tval(thr, comp_ctx->tok22_idx))); +} + +/* advance, expecting current token to be a specific token; parse next token in regexp context */ +DUK_LOCAL void duk__advance_expect(duk_compiler_ctx *comp_ctx, duk_small_int_t expect) { + duk__advance_helper(comp_ctx, expect); +} + +/* advance, whatever the current token is; parse next token in regexp context */ +DUK_LOCAL void duk__advance(duk_compiler_ctx *comp_ctx) { + duk__advance_helper(comp_ctx, -1); +} + +/* + * Helpers for duk_compiler_func. + */ + +/* init function state: inits valstack allocations */ +DUK_LOCAL void duk__init_func_valstack_slots(duk_compiler_ctx *comp_ctx) { + duk_compiler_func *func = &comp_ctx->curr_func; + duk_hthread *thr = comp_ctx->thr; + duk_idx_t entry_top; + + entry_top = duk_get_top(thr); + + duk_memzero(func, sizeof(*func)); /* intentional overlap with earlier memzero */ +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + func->h_name = NULL; + func->h_consts = NULL; + func->h_funcs = NULL; + func->h_decls = NULL; + func->h_labelnames = NULL; + func->h_labelinfos = NULL; + func->h_argnames = NULL; + func->h_varmap = NULL; +#endif + + duk_require_stack(thr, DUK__FUNCTION_INIT_REQUIRE_SLOTS); + + DUK_BW_INIT_PUSHBUF(thr, &func->bw_code, DUK__BC_INITIAL_INSTS * sizeof(duk_compiler_instr)); + /* code_idx = entry_top + 0 */ + + duk_push_array(thr); + func->consts_idx = entry_top + 1; + func->h_consts = DUK_GET_HOBJECT_POSIDX(thr, entry_top + 1); + DUK_ASSERT(func->h_consts != NULL); + + duk_push_array(thr); + func->funcs_idx = entry_top + 2; + func->h_funcs = DUK_GET_HOBJECT_POSIDX(thr, entry_top + 2); + DUK_ASSERT(func->h_funcs != NULL); + DUK_ASSERT(func->fnum_next == 0); + + duk_push_array(thr); + func->decls_idx = entry_top + 3; + func->h_decls = DUK_GET_HOBJECT_POSIDX(thr, entry_top + 3); + DUK_ASSERT(func->h_decls != NULL); + + duk_push_array(thr); + func->labelnames_idx = entry_top + 4; + func->h_labelnames = DUK_GET_HOBJECT_POSIDX(thr, entry_top + 4); + DUK_ASSERT(func->h_labelnames != NULL); + + duk_push_dynamic_buffer(thr, 0); + func->labelinfos_idx = entry_top + 5; + func->h_labelinfos = (duk_hbuffer_dynamic *) duk_known_hbuffer(thr, entry_top + 5); + DUK_ASSERT(func->h_labelinfos != NULL); + DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(func->h_labelinfos) && !DUK_HBUFFER_HAS_EXTERNAL(func->h_labelinfos)); + + duk_push_array(thr); + func->argnames_idx = entry_top + 6; + func->h_argnames = DUK_GET_HOBJECT_POSIDX(thr, entry_top + 6); + DUK_ASSERT(func->h_argnames != NULL); + + duk_push_bare_object(thr); + func->varmap_idx = entry_top + 7; + func->h_varmap = DUK_GET_HOBJECT_POSIDX(thr, entry_top + 7); + DUK_ASSERT(func->h_varmap != NULL); +} + +/* reset function state (prepare for pass 2) */ +DUK_LOCAL void duk__reset_func_for_pass2(duk_compiler_ctx *comp_ctx) { + duk_compiler_func *func = &comp_ctx->curr_func; + duk_hthread *thr = comp_ctx->thr; + + /* reset bytecode buffer but keep current size; pass 2 will + * require same amount or more. + */ + DUK_BW_RESET_SIZE(thr, &func->bw_code); + + duk_set_length(thr, func->consts_idx, 0); + /* keep func->h_funcs; inner functions are not reparsed to avoid O(depth^2) parsing */ + func->fnum_next = 0; + /* duk_set_length(thr, func->funcs_idx, 0); */ + duk_set_length(thr, func->labelnames_idx, 0); + duk_hbuffer_reset(thr, func->h_labelinfos); + /* keep func->h_argnames; it is fixed for all passes */ + + /* truncated in case pass 3 needed */ + duk_push_bare_object(thr); + duk_replace(thr, func->varmap_idx); + func->h_varmap = DUK_GET_HOBJECT_POSIDX(thr, func->varmap_idx); + DUK_ASSERT(func->h_varmap != NULL); +} + +/* cleanup varmap from any null entries, compact it, etc; returns number + * of final entries after cleanup. + */ +DUK_LOCAL duk_int_t duk__cleanup_varmap(duk_compiler_ctx *comp_ctx) { + duk_hthread *thr = comp_ctx->thr; + duk_hobject *h_varmap; + duk_hstring *h_key; + duk_tval *tv; + duk_uint32_t i, e_next; + duk_int_t ret; + + /* [ ... varmap ] */ + + h_varmap = DUK_GET_HOBJECT_NEGIDX(thr, -1); + DUK_ASSERT(h_varmap != NULL); + + ret = 0; + e_next = DUK_HOBJECT_GET_ENEXT(h_varmap); + for (i = 0; i < e_next; i++) { + h_key = DUK_HOBJECT_E_GET_KEY(thr->heap, h_varmap, i); + if (!h_key) { + continue; + } + + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, h_varmap, i)); + + /* The entries can either be register numbers or 'null' values. + * Thus, no need to DECREF them and get side effects. DECREF'ing + * the keys (strings) can cause memory to be freed but no side + * effects as strings don't have finalizers. This is why we can + * rely on the object properties not changing from underneath us. + */ + + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, h_varmap, i); + if (!DUK_TVAL_IS_NUMBER(tv)) { + DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv)); + DUK_HOBJECT_E_SET_KEY(thr->heap, h_varmap, i, NULL); + DUK_HSTRING_DECREF(thr, h_key); + /* when key is NULL, value is garbage so no need to set */ + } else { + ret++; + } + } + + duk_compact_m1(thr); + + return ret; +} + +/* Convert duk_compiler_func into a function template, leaving the result + * on top of stack. + */ +/* XXX: awkward and bloated asm -- use faster internal accesses */ +DUK_LOCAL void duk__convert_to_func_template(duk_compiler_ctx *comp_ctx) { + duk_compiler_func *func = &comp_ctx->curr_func; + duk_hthread *thr = comp_ctx->thr; + duk_hcompfunc *h_res; + duk_hbuffer_fixed *h_data; + duk_size_t consts_count; + duk_size_t funcs_count; + duk_size_t code_count; + duk_size_t code_size; + duk_size_t data_size; + duk_size_t i; + duk_tval *p_const; + duk_hobject **p_func; + duk_instr_t *p_instr; + duk_compiler_instr *q_instr; + duk_tval *tv; + duk_bool_t keep_varmap; + duk_bool_t keep_formals; +#if !defined(DUK_USE_DEBUGGER_SUPPORT) + duk_size_t formals_length; +#endif + + DUK_DDD(DUK_DDDPRINT("converting duk_compiler_func to function/template")); + + /* + * Push result object and init its flags + */ + + /* Valstack should suffice here, required on function valstack init */ + + h_res = duk_push_hcompfunc(thr); + DUK_ASSERT(h_res != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_res) == thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, (duk_hobject *) h_res, NULL); /* Function templates are "bare objects". */ + + if (func->is_function) { + DUK_DDD(DUK_DDDPRINT("function -> set NEWENV")); + DUK_HOBJECT_SET_NEWENV((duk_hobject *) h_res); + + if (!func->is_arguments_shadowed) { + /* arguments object would be accessible; note that shadowing + * bindings are arguments or function declarations, neither + * of which are deletable, so this is safe. + */ + + if (func->id_access_arguments || func->may_direct_eval) { + DUK_DDD(DUK_DDDPRINT("function may access 'arguments' object directly or " + "indirectly -> set CREATEARGS")); + DUK_HOBJECT_SET_CREATEARGS((duk_hobject *) h_res); + } + } + } else if (func->is_eval && func->is_strict) { + DUK_DDD(DUK_DDDPRINT("strict eval code -> set NEWENV")); + DUK_HOBJECT_SET_NEWENV((duk_hobject *) h_res); + } else { + /* non-strict eval: env is caller's env or global env (direct vs. indirect call) + * global code: env is is global env + */ + DUK_DDD(DUK_DDDPRINT("non-strict eval code or global code -> no NEWENV")); + DUK_ASSERT(!DUK_HOBJECT_HAS_NEWENV((duk_hobject *) h_res)); + } + +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + if (func->is_function && func->is_namebinding && func->h_name != NULL) { + /* Object literal set/get functions have a name (property + * name) but must not have a lexical name binding, see + * test-bug-getset-func-name.js. + */ + DUK_DDD(DUK_DDDPRINT("function expression with a name -> set NAMEBINDING")); + DUK_HOBJECT_SET_NAMEBINDING((duk_hobject *) h_res); + } +#endif + + if (func->is_strict) { + DUK_DDD(DUK_DDDPRINT("function is strict -> set STRICT")); + DUK_HOBJECT_SET_STRICT((duk_hobject *) h_res); + } + + if (func->is_notail) { + DUK_DDD(DUK_DDDPRINT("function is notail -> set NOTAIL")); + DUK_HOBJECT_SET_NOTAIL((duk_hobject *) h_res); + } + + if (func->is_constructable) { + DUK_DDD(DUK_DDDPRINT("function is constructable -> set CONSTRUCTABLE")); + DUK_HOBJECT_SET_CONSTRUCTABLE((duk_hobject *) h_res); + } + + /* + * Build function fixed size 'data' buffer, which contains bytecode, + * constants, and inner function references. + * + * During the building phase 'data' is reachable but incomplete. + * Only incref's occur during building (no refzero or GC happens), + * so the building process is atomic. + */ + + consts_count = duk_hobject_get_length(thr, func->h_consts); + funcs_count = duk_hobject_get_length(thr, func->h_funcs) / 3; + code_count = DUK_BW_GET_SIZE(thr, &func->bw_code) / sizeof(duk_compiler_instr); + code_size = code_count * sizeof(duk_instr_t); + + data_size = consts_count * sizeof(duk_tval) + + funcs_count * sizeof(duk_hobject *) + + code_size; + + DUK_DDD(DUK_DDDPRINT("consts_count=%ld, funcs_count=%ld, code_size=%ld -> " + "data_size=%ld*%ld + %ld*%ld + %ld = %ld", + (long) consts_count, (long) funcs_count, (long) code_size, + (long) consts_count, (long) sizeof(duk_tval), + (long) funcs_count, (long) sizeof(duk_hobject *), + (long) code_size, (long) data_size)); + + duk_push_fixed_buffer_nozero(thr, data_size); + h_data = (duk_hbuffer_fixed *) (void *) duk_known_hbuffer(thr, -1); + + DUK_HCOMPFUNC_SET_DATA(thr->heap, h_res, (duk_hbuffer *) h_data); + DUK_HEAPHDR_INCREF(thr, h_data); + + p_const = (duk_tval *) (void *) DUK_HBUFFER_FIXED_GET_DATA_PTR(thr->heap, h_data); + for (i = 0; i < consts_count; i++) { + DUK_ASSERT(i <= DUK_UARRIDX_MAX); /* const limits */ + tv = duk_hobject_find_existing_array_entry_tval_ptr(thr->heap, func->h_consts, (duk_uarridx_t) i); + DUK_ASSERT(tv != NULL); + DUK_TVAL_SET_TVAL(p_const, tv); + p_const++; + DUK_TVAL_INCREF(thr, tv); /* may be a string constant */ + + DUK_DDD(DUK_DDDPRINT("constant: %!T", (duk_tval *) tv)); + } + + p_func = (duk_hobject **) p_const; + DUK_HCOMPFUNC_SET_FUNCS(thr->heap, h_res, p_func); + for (i = 0; i < funcs_count; i++) { + duk_hobject *h; + DUK_ASSERT(i * 3 <= DUK_UARRIDX_MAX); /* func limits */ + tv = duk_hobject_find_existing_array_entry_tval_ptr(thr->heap, func->h_funcs, (duk_uarridx_t) (i * 3)); + DUK_ASSERT(tv != NULL); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); + h = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(h)); + *p_func++ = h; + DUK_HOBJECT_INCREF(thr, h); + + DUK_DDD(DUK_DDDPRINT("inner function: %p -> %!iO", + (void *) h, (duk_heaphdr *) h)); + } + + p_instr = (duk_instr_t *) p_func; + DUK_HCOMPFUNC_SET_BYTECODE(thr->heap, h_res, p_instr); + + /* copy bytecode instructions one at a time */ + q_instr = (duk_compiler_instr *) (void *) DUK_BW_GET_BASEPTR(thr, &func->bw_code); + for (i = 0; i < code_count; i++) { + p_instr[i] = q_instr[i].ins; + } + /* Note: 'q_instr' is still used below */ + + DUK_ASSERT((duk_uint8_t *) (p_instr + code_count) == DUK_HBUFFER_FIXED_GET_DATA_PTR(thr->heap, h_data) + data_size); + + duk_pop(thr); /* 'data' (and everything in it) is reachable through h_res now */ + + /* + * Init non-property result fields + * + * 'nregs' controls how large a register frame is allocated. + * + * 'nargs' controls how many formal arguments are written to registers: + * r0, ... r(nargs-1). The remaining registers are initialized to + * undefined. + */ + + DUK_ASSERT(func->temp_max >= 0); + h_res->nregs = (duk_uint16_t) func->temp_max; + h_res->nargs = (duk_uint16_t) duk_hobject_get_length(thr, func->h_argnames); + DUK_ASSERT(h_res->nregs >= h_res->nargs); /* pass2 allocation handles this */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + h_res->start_line = (duk_uint32_t) func->min_line; + h_res->end_line = (duk_uint32_t) func->max_line; +#endif + + /* + * Init object properties + * + * Properties should be added in decreasing order of access frequency. + * (Not very critical for function templates.) + */ + + DUK_DDD(DUK_DDDPRINT("init function properties")); + + /* [ ... res ] */ + + /* _Varmap: omitted if function is guaranteed not to do a slow path + * identifier access that might be caught by locally declared variables. + * The varmap can also be omitted if it turns out empty of actual + * register mappings after a cleanup. When debugging is enabled, we + * always need the varmap to be able to lookup variables at any point. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + DUK_DD(DUK_DDPRINT("keeping _Varmap because debugger support is enabled")); + keep_varmap = 1; +#else + if (func->id_access_slow_own || /* directly uses slow accesses that may match own variables */ + func->id_access_arguments || /* accesses 'arguments' directly */ + func->may_direct_eval || /* may indirectly slow access through a direct eval */ + funcs_count > 0) { /* has inner functions which may slow access (XXX: this can be optimized by looking at the inner functions) */ + DUK_DD(DUK_DDPRINT("keeping _Varmap because of direct eval, slow path access that may match local variables, or presence of inner functions")); + keep_varmap = 1; + } else { + DUK_DD(DUK_DDPRINT("dropping _Varmap")); + keep_varmap = 0; + } +#endif + + if (keep_varmap) { + duk_int_t num_used; + duk_dup(thr, func->varmap_idx); + num_used = duk__cleanup_varmap(comp_ctx); + DUK_DDD(DUK_DDDPRINT("cleaned up varmap: %!T (num_used=%ld)", + (duk_tval *) duk_get_tval(thr, -1), (long) num_used)); + + if (num_used > 0) { + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VARMAP, DUK_PROPDESC_FLAGS_NONE); + } else { + DUK_DD(DUK_DDPRINT("varmap is empty after cleanup -> no need to add")); + duk_pop(thr); + } + } + + /* _Formals: omitted if function is guaranteed not to need a (non-strict) + * arguments object, and _Formals.length matches nargs exactly. + * + * Non-arrow functions can't see an outer function's 'argument' binding + * (because they have their own), but arrow functions can. When arrow + * functions are added, this condition would need to be added: + * inner_arrow_funcs_count > 0 inner arrow functions may access 'arguments' + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + DUK_DD(DUK_DDPRINT("keeping _Formals because debugger support is enabled")); + keep_formals = 1; +#else + formals_length = duk_get_length(thr, func->argnames_idx); + if (formals_length != (duk_size_t) h_res->nargs) { + /* Nargs not enough for closure .length: keep _Formals regardless + * of its length. Shouldn't happen in practice at the moment. + */ + DUK_DD(DUK_DDPRINT("keeping _Formals because _Formals.length != nargs")); + keep_formals = 1; + } else if ((func->id_access_arguments || func->may_direct_eval) && + (formals_length > 0)) { + /* Direct eval (may access 'arguments') or accesses 'arguments' + * explicitly: keep _Formals unless it is zero length. + */ + DUK_DD(DUK_DDPRINT("keeping _Formals because of direct eval or explicit access to 'arguments', and _Formals.length != 0")); + keep_formals = 1; + } else { + DUK_DD(DUK_DDPRINT("omitting _Formals, nargs matches _Formals.length, so no properties added")); + keep_formals = 0; + } +#endif + + if (keep_formals) { + duk_dup(thr, func->argnames_idx); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_FORMALS, DUK_PROPDESC_FLAGS_NONE); + } + + /* name */ +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + if (func->h_name) { + duk_push_hstring(thr, func->h_name); + DUK_DD(DUK_DDPRINT("setting function template .name to %!T", duk_get_tval(thr, -1))); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_NONE); + } +#endif /* DUK_USE_FUNC_NAME_PROPERTY */ + + /* _Source */ +#if defined(DUK_USE_NONSTD_FUNC_SOURCE_PROPERTY) + if (0) { + /* XXX: Currently function source code is not stored, as it is not + * required by the standard. Source code should not be stored by + * default (user should enable it explicitly), and the source should + * probably be compressed with a trivial text compressor; average + * compression of 20-30% is quite easy to achieve even with a trivial + * compressor (RLE + backwards lookup). + * + * Debugging needs source code to be useful: sometimes input code is + * not found in files as it may be generated and then eval()'d, given + * by dynamic C code, etc. + * + * Other issues: + * + * - Need tokenizer indices for start and end to substring + * - Always normalize function declaration part? + * - If we keep _Formals, only need to store body + */ + + /* + * For global or eval code this is straightforward. For functions + * created with the Function constructor we only get the source for + * the body and must manufacture the "function ..." part. + * + * For instance, for constructed functions (v8): + * + * > a = new Function("foo", "bar", "print(foo)"); + * [Function] + * > a.toString() + * 'function anonymous(foo,bar) {\nprint(foo)\n}' + * + * Similarly for e.g. getters (v8): + * + * > x = { get a(foo,bar) { print(foo); } } + * { a: [Getter] } + * > Object.getOwnPropertyDescriptor(x, 'a').get.toString() + * 'function a(foo,bar) { print(foo); }' + */ + +#if 0 + duk_push_literal(thr, "XXX"); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_SOURCE, DUK_PROPDESC_FLAGS_NONE); +#endif + } +#endif /* DUK_USE_NONSTD_FUNC_SOURCE_PROPERTY */ + + /* _Pc2line */ +#if defined(DUK_USE_PC2LINE) + if (1) { + /* + * Size-optimized pc->line mapping. + */ + + DUK_ASSERT(code_count <= DUK_COMPILER_MAX_BYTECODE_LENGTH); + duk_hobject_pc2line_pack(thr, q_instr, (duk_uint_fast32_t) code_count); /* -> pushes fixed buffer */ + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_PC2LINE, DUK_PROPDESC_FLAGS_NONE); + + /* XXX: if assertions enabled, walk through all valid PCs + * and check line mapping. + */ + } +#endif /* DUK_USE_PC2LINE */ + + /* fileName */ +#if defined(DUK_USE_FUNC_FILENAME_PROPERTY) + if (comp_ctx->h_filename) { + /* + * Source filename (or equivalent), for identifying thrown errors. + */ + + duk_push_hstring(thr, comp_ctx->h_filename); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_FILE_NAME, DUK_PROPDESC_FLAGS_NONE); + } +#endif + + DUK_DD(DUK_DDPRINT("converted function: %!ixT", + (duk_tval *) duk_get_tval(thr, -1))); + + /* + * Compact the function template. + */ + + duk_compact_m1(thr); + + /* + * Debug dumping + */ + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + { + duk_hcompfunc *h; + duk_instr_t *p, *p_start, *p_end; + + h = (duk_hcompfunc *) duk_get_hobject(thr, -1); + p_start = (duk_instr_t *) DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, h); + p_end = (duk_instr_t *) DUK_HCOMPFUNC_GET_CODE_END(thr->heap, h); + + p = p_start; + while (p < p_end) { + DUK_DDD(DUK_DDDPRINT("BC %04ld: %!I ; 0x%08lx op=%ld (%!C) a=%ld b=%ld c=%ld", + (long) (p - p_start), + (duk_instr_t) (*p), + (unsigned long) (*p), + (long) DUK_DEC_OP(*p), + (long) DUK_DEC_OP(*p), + (long) DUK_DEC_A(*p), + (long) DUK_DEC_B(*p), + (long) DUK_DEC_C(*p))); + p++; + } + } +#endif +} + +/* + * Code emission helpers + * + * Some emission helpers understand the range of target and source reg/const + * values and automatically emit shuffling code if necessary. This is the + * case when the slot in question (A, B, C) is used in the standard way and + * for opcodes the emission helpers explicitly understand (like DUK_OP_MPUTOBJ). + * + * The standard way is that: + * - slot A is a target register + * - slot B is a source register/constant + * - slot C is a source register/constant + * + * If a slot is used in a non-standard way the caller must indicate this + * somehow. If a slot is used as a target instead of a source (or vice + * versa), this can be indicated with a flag to trigger proper shuffling + * (e.g. DUK__EMIT_FLAG_B_IS_TARGET). If the value in the slot is not + * register/const related at all, the caller must ensure that the raw value + * fits into the corresponding slot so as to not trigger shuffling. The + * caller must set a "no shuffle" flag to ensure compilation fails if + * shuffling were to be triggered because of an internal error. + * + * For slots B and C the raw slot size is 9 bits but one bit is reserved for + * the reg/const indicator. To use the full 9-bit range for a raw value, + * shuffling must be disabled with the DUK__EMIT_FLAG_NO_SHUFFLE_{B,C} flag. + * Shuffling is only done for A, B, and C slots, not the larger BC or ABC slots. + * + * There is call handling specific understanding in the A-B-C emitter to + * convert call setup and call instructions into indirect ones if necessary. + */ + +/* Code emission flags, passed in the 'opcode' field. Opcode + flags + * fit into 16 bits for now, so use duk_small_uint_t. + */ +#define DUK__EMIT_FLAG_NO_SHUFFLE_A (1 << 8) +#define DUK__EMIT_FLAG_NO_SHUFFLE_B (1 << 9) +#define DUK__EMIT_FLAG_NO_SHUFFLE_C (1 << 10) +#define DUK__EMIT_FLAG_A_IS_SOURCE (1 << 11) /* slot A is a source (default: target) */ +#define DUK__EMIT_FLAG_B_IS_TARGET (1 << 12) /* slot B is a target (default: source) */ +#define DUK__EMIT_FLAG_C_IS_TARGET (1 << 13) /* slot C is a target (default: source) */ +#define DUK__EMIT_FLAG_BC_REGCONST (1 << 14) /* slots B and C are reg/const */ +#define DUK__EMIT_FLAG_RESERVE_JUMPSLOT (1 << 15) /* reserve a jumpslot after instr before target spilling, used for NEXTENUM */ + +/* XXX: macro smaller than call? */ +DUK_LOCAL duk_int_t duk__get_current_pc(duk_compiler_ctx *comp_ctx) { + duk_compiler_func *func; + func = &comp_ctx->curr_func; + return (duk_int_t) (DUK_BW_GET_SIZE(comp_ctx->thr, &func->bw_code) / sizeof(duk_compiler_instr)); +} + +DUK_LOCAL duk_compiler_instr *duk__get_instr_ptr(duk_compiler_ctx *comp_ctx, duk_int_t pc) { + DUK_ASSERT(pc >= 0); + DUK_ASSERT((duk_size_t) pc < (duk_size_t) (DUK_BW_GET_SIZE(comp_ctx->thr, &comp_ctx->curr_func.bw_code) / sizeof(duk_compiler_instr))); + return ((duk_compiler_instr *) (void *) DUK_BW_GET_BASEPTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code)) + pc; +} + +/* emit instruction; could return PC but that's not needed in the majority + * of cases. + */ +DUK_LOCAL void duk__emit(duk_compiler_ctx *comp_ctx, duk_instr_t ins) { +#if defined(DUK_USE_PC2LINE) + duk_int_t line; +#endif + duk_compiler_instr *instr; + + DUK_DDD(DUK_DDDPRINT("duk__emit: 0x%08lx curr_token.start_line=%ld prev_token.start_line=%ld pc=%ld --> %!I", + (unsigned long) ins, + (long) comp_ctx->curr_token.start_line, + (long) comp_ctx->prev_token.start_line, + (long) duk__get_current_pc(comp_ctx), + (duk_instr_t) ins)); + + instr = (duk_compiler_instr *) (void *) DUK_BW_ENSURE_GETPTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code, sizeof(duk_compiler_instr)); + DUK_BW_ADD_PTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code, sizeof(duk_compiler_instr)); + +#if defined(DUK_USE_PC2LINE) + /* The line number tracking is a bit inconsistent right now, which + * affects debugger accuracy. Mostly call sites emit opcodes when + * they have parsed a token (say a terminating semicolon) and called + * duk__advance(). In this case the line number of the previous + * token is the most accurate one (except in prologue where + * prev_token.start_line is 0). This is probably not 100% correct + * right now. + */ + /* approximation, close enough */ + line = comp_ctx->prev_token.start_line; + if (line == 0) { + line = comp_ctx->curr_token.start_line; + } +#endif + + instr->ins = ins; +#if defined(DUK_USE_PC2LINE) + instr->line = (duk_uint32_t) line; +#endif +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (line < comp_ctx->curr_func.min_line) { + comp_ctx->curr_func.min_line = line; + } + if (line > comp_ctx->curr_func.max_line) { + comp_ctx->curr_func.max_line = line; + } +#endif + + /* Limit checks for bytecode byte size and line number. */ + if (DUK_UNLIKELY(DUK_BW_GET_SIZE(comp_ctx->thr, &comp_ctx->curr_func.bw_code) > DUK_USE_ESBC_MAX_BYTES)) { + goto fail_bc_limit; + } +#if defined(DUK_USE_PC2LINE) && defined(DUK_USE_ESBC_LIMITS) +#if defined(DUK_USE_BUFLEN16) + /* Buffer length is bounded to 0xffff automatically, avoid compile warning. */ + if (DUK_UNLIKELY(line > DUK_USE_ESBC_MAX_LINENUMBER)) { + goto fail_bc_limit; + } +#else + if (DUK_UNLIKELY(line > DUK_USE_ESBC_MAX_LINENUMBER)) { + goto fail_bc_limit; + } +#endif +#endif + + return; + + fail_bc_limit: + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_BYTECODE_LIMIT); + DUK_WO_NORETURN(return;); +} + +/* Update function min/max line from current token. Needed to improve + * function line range information for debugging, so that e.g. opening + * curly brace is covered by line range even when no opcodes are emitted + * for the line containing the brace. + */ +DUK_LOCAL void duk__update_lineinfo_currtoken(duk_compiler_ctx *comp_ctx) { +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_int_t line; + + line = comp_ctx->curr_token.start_line; + if (line == 0) { + return; + } + if (line < comp_ctx->curr_func.min_line) { + comp_ctx->curr_func.min_line = line; + } + if (line > comp_ctx->curr_func.max_line) { + comp_ctx->curr_func.max_line = line; + } +#else + DUK_UNREF(comp_ctx); +#endif +} + +DUK_LOCAL void duk__emit_op_only(duk_compiler_ctx *comp_ctx, duk_small_uint_t op) { + duk__emit(comp_ctx, DUK_ENC_OP_ABC(op, 0)); +} + +/* Important main primitive. */ +DUK_LOCAL void duk__emit_a_b_c(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a, duk_regconst_t b, duk_regconst_t c) { + duk_instr_t ins = 0; + duk_int_t a_out = -1; + duk_int_t b_out = -1; + duk_int_t c_out = -1; + duk_int_t tmp; + duk_small_uint_t op = op_flags & 0xffU; + + DUK_DDD(DUK_DDDPRINT("emit: op_flags=%04lx, a=%ld, b=%ld, c=%ld", + (unsigned long) op_flags, (long) a, (long) b, (long) c)); + + /* We could rely on max temp/const checks: if they don't exceed BC + * limit, nothing here can either (just asserts would be enough). + * Currently we check for the limits, which provides additional + * protection against creating invalid bytecode due to compiler + * bugs. + */ + + DUK_ASSERT_DISABLE((op_flags & 0xff) >= DUK_BC_OP_MIN); /* unsigned */ + DUK_ASSERT((op_flags & 0xff) <= DUK_BC_OP_MAX); + DUK_ASSERT(DUK__ISREG(a)); + DUK_ASSERT(b != -1); /* Not 'none'. */ + DUK_ASSERT(c != -1); /* Not 'none'. */ + + /* Input shuffling happens before the actual operation, while output + * shuffling happens afterwards. Output shuffling decisions are still + * made at the same time to reduce branch clutter; output shuffle decisions + * are recorded into X_out variables. + */ + + /* Slot A: currently no support for reg/const. */ + +#if defined(DUK_USE_SHUFFLE_TORTURE) + if (a <= DUK_BC_A_MAX && (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_A)) { +#else + if (a <= DUK_BC_A_MAX) { +#endif + ; + } else if (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_A) { + DUK_D(DUK_DPRINT("out of regs: 'a' (reg) needs shuffling but shuffle prohibited, a: %ld", (long) a)); + goto error_outofregs; + } else if (a <= DUK_BC_BC_MAX) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle1; + if (op_flags & DUK__EMIT_FLAG_A_IS_SOURCE) { + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_LDREG, tmp, a)); + } else { + /* Output shuffle needed after main operation */ + a_out = a; + + /* The DUK_OP_CSVAR output shuffle assumes shuffle registers are + * consecutive. + */ + DUK_ASSERT((comp_ctx->curr_func.shuffle1 == 0 && comp_ctx->curr_func.shuffle2 == 0) || + (comp_ctx->curr_func.shuffle2 == comp_ctx->curr_func.shuffle1 + 1)); + if (op == DUK_OP_CSVAR) { + /* For CSVAR the limit is one smaller because output shuffle + * must be able to express 'a + 1' in BC. + */ + if (a + 1 > DUK_BC_BC_MAX) { + goto error_outofregs; + } + } + } + a = tmp; + } else { + DUK_D(DUK_DPRINT("out of regs: 'a' (reg) needs shuffling but does not fit into BC, a: %ld", (long) a)); + goto error_outofregs; + } + + /* Slot B: reg/const support, mapped to bit 0 of opcode. */ + + if ((b & DUK__CONST_MARKER) != 0) { + DUK_ASSERT((op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_B) == 0); + DUK_ASSERT((op_flags & DUK__EMIT_FLAG_B_IS_TARGET) == 0); + b = b & ~DUK__CONST_MARKER; +#if defined(DUK_USE_SHUFFLE_TORTURE) + if (0) { +#else + if (b <= 0xff) { +#endif + if (op_flags & DUK__EMIT_FLAG_BC_REGCONST) { + /* Opcode follows B/C reg/const convention. */ + DUK_ASSERT((op & 0x01) == 0); + ins |= DUK_ENC_OP_A_B_C(0x01, 0, 0, 0); /* const flag for B */ + } else { + DUK_D(DUK_DPRINT("B is const, opcode is not B/C reg/const: %x", op_flags)); + } + } else if (b <= DUK_BC_BC_MAX) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle2; + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_LDCONST, tmp, b)); + b = tmp; + } else { + DUK_D(DUK_DPRINT("out of regs: 'b' (const) needs shuffling but does not fit into BC, b: %ld", (long) b)); + goto error_outofregs; + } + } else { +#if defined(DUK_USE_SHUFFLE_TORTURE) + if (b <= 0xff && (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_B)) { +#else + if (b <= 0xff) { +#endif + ; + } else if (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_B) { + if (b > DUK_BC_B_MAX) { + /* Note: 0xff != DUK_BC_B_MAX */ + DUK_D(DUK_DPRINT("out of regs: 'b' (reg) needs shuffling but shuffle prohibited, b: %ld", (long) b)); + goto error_outofregs; + } + } else if (b <= DUK_BC_BC_MAX) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle2; + if (op_flags & DUK__EMIT_FLAG_B_IS_TARGET) { + /* Output shuffle needed after main operation */ + b_out = b; + } + if (!(op_flags & DUK__EMIT_FLAG_B_IS_TARGET)) { + if (op == DUK_OP_MPUTOBJ || op == DUK_OP_MPUTARR) { + /* Special handling for MPUTOBJ/MPUTARR shuffling. + * For each, slot B identifies the first register of a range + * of registers, so normal shuffling won't work. Instead, + * an indirect version of the opcode is used. + */ + DUK_ASSERT((op_flags & DUK__EMIT_FLAG_B_IS_TARGET) == 0); + duk__emit_load_int32_noshuffle(comp_ctx, tmp, b); + DUK_ASSERT(DUK_OP_MPUTOBJI == DUK_OP_MPUTOBJ + 1); + DUK_ASSERT(DUK_OP_MPUTARRI == DUK_OP_MPUTARR + 1); + op_flags++; /* indirect opcode follows direct */ + } else { + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_LDREG, tmp, b)); + } + } + b = tmp; + } else { + DUK_D(DUK_DPRINT("out of regs: 'b' (reg) needs shuffling but does not fit into BC, b: %ld", (long) b)); + goto error_outofregs; + } + } + + /* Slot C: reg/const support, mapped to bit 1 of opcode. */ + + if ((c & DUK__CONST_MARKER) != 0) { + DUK_ASSERT((op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_C) == 0); + DUK_ASSERT((op_flags & DUK__EMIT_FLAG_C_IS_TARGET) == 0); + c = c & ~DUK__CONST_MARKER; +#if defined(DUK_USE_SHUFFLE_TORTURE) + if (0) { +#else + if (c <= 0xff) { +#endif + if (op_flags & DUK__EMIT_FLAG_BC_REGCONST) { + /* Opcode follows B/C reg/const convention. */ + DUK_ASSERT((op & 0x02) == 0); + ins |= DUK_ENC_OP_A_B_C(0x02, 0, 0, 0); /* const flag for C */ + } else { + DUK_D(DUK_DPRINT("C is const, opcode is not B/C reg/const: %x", op_flags)); + } + } else if (c <= DUK_BC_BC_MAX) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle3; + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_LDCONST, tmp, c)); + c = tmp; + } else { + DUK_D(DUK_DPRINT("out of regs: 'c' (const) needs shuffling but does not fit into BC, c: %ld", (long) c)); + goto error_outofregs; + } + } else { +#if defined(DUK_USE_SHUFFLE_TORTURE) + if (c <= 0xff && (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_C)) { +#else + if (c <= 0xff) { +#endif + ; + } else if (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_C) { + if (c > DUK_BC_C_MAX) { + /* Note: 0xff != DUK_BC_C_MAX */ + DUK_D(DUK_DPRINT("out of regs: 'c' (reg) needs shuffling but shuffle prohibited, c: %ld", (long) c)); + goto error_outofregs; + } + } else if (c <= DUK_BC_BC_MAX) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle3; + if (op_flags & DUK__EMIT_FLAG_C_IS_TARGET) { + /* Output shuffle needed after main operation */ + c_out = c; + } else { + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_LDREG, tmp, c)); + } + c = tmp; + } else { + DUK_D(DUK_DPRINT("out of regs: 'c' (reg) needs shuffling but does not fit into BC, c: %ld", (long) c)); + goto error_outofregs; + } + } + + /* Main operation */ + + DUK_ASSERT(a >= DUK_BC_A_MIN); + DUK_ASSERT(a <= DUK_BC_A_MAX); + DUK_ASSERT(b >= DUK_BC_B_MIN); + DUK_ASSERT(b <= DUK_BC_B_MAX); + DUK_ASSERT(c >= DUK_BC_C_MIN); + DUK_ASSERT(c <= DUK_BC_C_MAX); + + ins |= DUK_ENC_OP_A_B_C(op_flags & 0xff, a, b, c); + duk__emit(comp_ctx, ins); + + /* NEXTENUM needs a jump slot right after the main instruction. + * When the JUMP is taken, output spilling is not needed so this + * workaround is possible. The jump slot PC is exceptionally + * plumbed through comp_ctx to minimize call sites. + */ + if (op_flags & DUK__EMIT_FLAG_RESERVE_JUMPSLOT) { + comp_ctx->emit_jumpslot_pc = duk__get_current_pc(comp_ctx); + duk__emit_abc(comp_ctx, DUK_OP_JUMP, 0); + } + + /* Output shuffling: only one output register is realistically possible. + * + * (Zero would normally be an OK marker value: if the target register + * was zero, it would never be shuffled. But with DUK_USE_SHUFFLE_TORTURE + * this is no longer true, so use -1 as a marker instead.) + */ + + if (a_out >= 0) { + DUK_ASSERT(b_out < 0); + DUK_ASSERT(c_out < 0); + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_STREG, a, a_out)); + + if (op == DUK_OP_CSVAR) { + /* Special handling for CSVAR shuffling. The variable lookup + * results in a <value, this binding> pair in successive + * registers so use two shuffle registers and two output + * loads. (In practice this is dead code because temp/const + * limit is reached first.) + */ + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_STREG, a + 1, a_out + 1)); + } + } else if (b_out >= 0) { + DUK_ASSERT(a_out < 0); + DUK_ASSERT(c_out < 0); + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_STREG, b, b_out)); + } else if (c_out >= 0) { + DUK_ASSERT(b_out < 0); + DUK_ASSERT(c_out < 0); + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_STREG, c, c_out)); + } + + return; + + error_outofregs: + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_REG_LIMIT); + DUK_WO_NORETURN(return;); +} + +/* For many of the helpers below it'd be technically correct to add + * "no shuffle" flags for parameters passed in as zero. For example, + * duk__emit_a_b() should call duk__emit_a_b_c() with C set to 0, and + * DUK__EMIT_FLAG_NO_SHUFFLE_C added to op_flags. However, since the + * C value is 0, it'll never get shuffled so adding the flag is just + * unnecessary additional code. This is unfortunately not true for + * "shuffle torture" mode which needs special handling. + */ + +DUK_LOCAL void duk__emit_a_b(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a, duk_regconst_t b) { +#if defined(DUK_USE_SHUFFLE_TORTURE) + op_flags |= DUK__EMIT_FLAG_NO_SHUFFLE_C; +#endif + duk__emit_a_b_c(comp_ctx, op_flags, a, b, 0); +} + +DUK_LOCAL void duk__emit_b_c(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t b, duk_regconst_t c) { +#if defined(DUK_USE_SHUFFLE_TORTURE) + op_flags |= DUK__EMIT_FLAG_NO_SHUFFLE_A; +#endif + duk__emit_a_b_c(comp_ctx, op_flags, 0, b, c); +} + +#if 0 /* unused */ +DUK_LOCAL void duk__emit_a(duk_compiler_ctx *comp_ctx, int op_flags, int a) { +#if defined(DUK_USE_SHUFFLE_TORTURE) + op_flags |= DUK__EMIT_FLAG_NO_SHUFFLE_B | DUK__EMIT_FLAG_NO_SHUFFLE_C; +#endif + duk__emit_a_b_c(comp_ctx, op_flags, a, 0, 0); +} +#endif + +#if 0 /* unused */ +DUK_LOCAL void duk__emit_b(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t b) { +#if defined(DUK_USE_SHUFFLE_TORTURE) + op_flags |= DUK__EMIT_FLAG_NO_SHUFFLE_A | DUK__EMIT_FLAG_NO_SHUFFLE_C; +#endif + duk__emit_a_b_c(comp_ctx, op_flags, 0, b, 0); +} +#endif + +DUK_LOCAL void duk__emit_a_bc(duk_compiler_ctx *comp_ctx, duk_small_uint_t op_flags, duk_regconst_t a, duk_regconst_t bc) { + duk_instr_t ins; + duk_int_t tmp; + + /* allow caller to give a const number with the DUK__CONST_MARKER */ + DUK_ASSERT(bc != -1); /* Not 'none'. */ + bc = bc & (~DUK__CONST_MARKER); + + DUK_ASSERT_DISABLE((op_flags & 0xff) >= DUK_BC_OP_MIN); /* unsigned */ + DUK_ASSERT((op_flags & 0xff) <= DUK_BC_OP_MAX); + DUK_ASSERT(bc >= DUK_BC_BC_MIN); + DUK_ASSERT(bc <= DUK_BC_BC_MAX); + DUK_ASSERT((bc & DUK__CONST_MARKER) == 0); + + if (bc <= DUK_BC_BC_MAX) { + ; + } else { + /* No BC shuffling now. */ + goto error_outofregs; + } + +#if defined(DUK_USE_SHUFFLE_TORTURE) + if (a <= DUK_BC_A_MAX && (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_A)) { +#else + if (a <= DUK_BC_A_MAX) { +#endif + ins = DUK_ENC_OP_A_BC(op_flags & 0xff, a, bc); + duk__emit(comp_ctx, ins); + } else if (op_flags & DUK__EMIT_FLAG_NO_SHUFFLE_A) { + goto error_outofregs; + } else if ((op_flags & 0xf0U) == DUK_OP_CALL0) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle1; + duk__emit_load_int32_noshuffle(comp_ctx, tmp, a); + op_flags |= DUK_BC_CALL_FLAG_INDIRECT; + ins = DUK_ENC_OP_A_BC(op_flags & 0xff, tmp, bc); + duk__emit(comp_ctx, ins); + } else if (a <= DUK_BC_BC_MAX) { + comp_ctx->curr_func.needs_shuffle = 1; + tmp = comp_ctx->curr_func.shuffle1; + ins = DUK_ENC_OP_A_BC(op_flags & 0xff, tmp, bc); + if (op_flags & DUK__EMIT_FLAG_A_IS_SOURCE) { + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_LDREG, tmp, a)); + duk__emit(comp_ctx, ins); + } else { + duk__emit(comp_ctx, ins); + duk__emit(comp_ctx, DUK_ENC_OP_A_BC(DUK_OP_STREG, tmp, a)); + } + } else { + goto error_outofregs; + } + return; + + error_outofregs: + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_REG_LIMIT); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__emit_bc(duk_compiler_ctx *comp_ctx, duk_small_uint_t op, duk_regconst_t bc) { +#if defined(DUK_USE_SHUFFLE_TORTURE) + op |= DUK__EMIT_FLAG_NO_SHUFFLE_A; +#endif + duk__emit_a_bc(comp_ctx, op, 0, bc); +} + +DUK_LOCAL void duk__emit_abc(duk_compiler_ctx *comp_ctx, duk_small_uint_t op, duk_regconst_t abc) { + duk_instr_t ins; + + DUK_ASSERT_DISABLE(op >= DUK_BC_OP_MIN); /* unsigned */ + DUK_ASSERT(op <= DUK_BC_OP_MAX); + DUK_ASSERT_DISABLE(abc >= DUK_BC_ABC_MIN); /* unsigned */ + DUK_ASSERT(abc <= DUK_BC_ABC_MAX); + DUK_ASSERT((abc & DUK__CONST_MARKER) == 0); + DUK_ASSERT(abc != -1); /* Not 'none'. */ + + if (abc <= DUK_BC_ABC_MAX) { + ; + } else { + goto error_outofregs; + } + ins = DUK_ENC_OP_ABC(op, abc); + DUK_DDD(DUK_DDDPRINT("duk__emit_abc: 0x%08lx line=%ld pc=%ld op=%ld (%!C) abc=%ld (%!I)", + (unsigned long) ins, (long) comp_ctx->curr_token.start_line, + (long) duk__get_current_pc(comp_ctx), (long) op, (long) op, + (long) abc, (duk_instr_t) ins)); + duk__emit(comp_ctx, ins); + return; + + error_outofregs: + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_REG_LIMIT); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__emit_load_int32_raw(duk_compiler_ctx *comp_ctx, duk_regconst_t reg, duk_int32_t val, duk_small_uint_t op_flags) { + /* XXX: Shuffling support could be implemented here so that LDINT+LDINTX + * would only shuffle once (instead of twice). The current code works + * though, and has a smaller compiler footprint. + */ + + if ((val >= (duk_int32_t) DUK_BC_BC_MIN - (duk_int32_t) DUK_BC_LDINT_BIAS) && + (val <= (duk_int32_t) DUK_BC_BC_MAX - (duk_int32_t) DUK_BC_LDINT_BIAS)) { + DUK_DDD(DUK_DDDPRINT("emit LDINT to reg %ld for %ld", (long) reg, (long) val)); + duk__emit_a_bc(comp_ctx, DUK_OP_LDINT | op_flags, reg, (duk_regconst_t) (val + (duk_int32_t) DUK_BC_LDINT_BIAS)); + } else { + duk_int32_t hi = val >> DUK_BC_LDINTX_SHIFT; + duk_int32_t lo = val & ((((duk_int32_t) 1) << DUK_BC_LDINTX_SHIFT) - 1); + DUK_ASSERT(lo >= 0); + DUK_DDD(DUK_DDDPRINT("emit LDINT+LDINTX to reg %ld for %ld -> hi %ld, lo %ld", + (long) reg, (long) val, (long) hi, (long) lo)); + duk__emit_a_bc(comp_ctx, DUK_OP_LDINT | op_flags, reg, (duk_regconst_t) (hi + (duk_int32_t) DUK_BC_LDINT_BIAS)); + duk__emit_a_bc(comp_ctx, DUK_OP_LDINTX | op_flags, reg, (duk_regconst_t) lo); + } +} + +DUK_LOCAL void duk__emit_load_int32(duk_compiler_ctx *comp_ctx, duk_regconst_t reg, duk_int32_t val) { + duk__emit_load_int32_raw(comp_ctx, reg, val, 0 /*op_flags*/); +} + +#if defined(DUK_USE_SHUFFLE_TORTURE) +/* Used by duk__emit*() calls so that we don't shuffle the loadints that + * are needed to handle indirect opcodes. + */ +DUK_LOCAL void duk__emit_load_int32_noshuffle(duk_compiler_ctx *comp_ctx, duk_regconst_t reg, duk_int32_t val) { + duk__emit_load_int32_raw(comp_ctx, reg, val, DUK__EMIT_FLAG_NO_SHUFFLE_A /*op_flags*/); +} +#else +DUK_LOCAL void duk__emit_load_int32_noshuffle(duk_compiler_ctx *comp_ctx, duk_regconst_t reg, duk_int32_t val) { + /* When torture not enabled, can just use the same helper because + * 'reg' won't get spilled. + */ + DUK_ASSERT(reg <= DUK_BC_A_MAX); + duk__emit_load_int32(comp_ctx, reg, val); +} +#endif + +DUK_LOCAL void duk__emit_jump(duk_compiler_ctx *comp_ctx, duk_int_t target_pc) { + duk_int_t curr_pc; + duk_int_t offset; + + curr_pc = (duk_int_t) (DUK_BW_GET_SIZE(comp_ctx->thr, &comp_ctx->curr_func.bw_code) / sizeof(duk_compiler_instr)); + offset = (duk_int_t) target_pc - (duk_int_t) curr_pc - 1; + DUK_ASSERT(offset + DUK_BC_JUMP_BIAS >= DUK_BC_ABC_MIN); + DUK_ASSERT(offset + DUK_BC_JUMP_BIAS <= DUK_BC_ABC_MAX); + duk__emit_abc(comp_ctx, DUK_OP_JUMP, (duk_regconst_t) (offset + DUK_BC_JUMP_BIAS)); +} + +DUK_LOCAL duk_int_t duk__emit_jump_empty(duk_compiler_ctx *comp_ctx) { + duk_int_t ret; + + ret = duk__get_current_pc(comp_ctx); /* useful for patching jumps later */ + duk__emit_op_only(comp_ctx, DUK_OP_JUMP); + return ret; +} + +/* Insert an empty jump in the middle of code emitted earlier. This is + * currently needed for compiling for-in. + */ +DUK_LOCAL void duk__insert_jump_entry(duk_compiler_ctx *comp_ctx, duk_int_t jump_pc) { +#if defined(DUK_USE_PC2LINE) + duk_int_t line; +#endif + duk_compiler_instr *instr; + duk_size_t offset; + + DUK_ASSERT(jump_pc >= 0); + offset = (duk_size_t) jump_pc * sizeof(duk_compiler_instr); + instr = (duk_compiler_instr *) (void *) + DUK_BW_INSERT_ENSURE_AREA(comp_ctx->thr, + &comp_ctx->curr_func.bw_code, + offset, + sizeof(duk_compiler_instr)); + +#if defined(DUK_USE_PC2LINE) + line = comp_ctx->curr_token.start_line; /* approximation, close enough */ +#endif + instr->ins = DUK_ENC_OP_ABC(DUK_OP_JUMP, 0); +#if defined(DUK_USE_PC2LINE) + instr->line = (duk_uint32_t) line; +#endif + + DUK_BW_ADD_PTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code, sizeof(duk_compiler_instr)); + if (DUK_UNLIKELY(DUK_BW_GET_SIZE(comp_ctx->thr, &comp_ctx->curr_func.bw_code) > DUK_USE_ESBC_MAX_BYTES)) { + goto fail_bc_limit; + } + return; + + fail_bc_limit: + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_BYTECODE_LIMIT); + DUK_WO_NORETURN(return;); +} + +/* Does not assume that jump_pc contains a DUK_OP_JUMP previously; this is intentional + * to allow e.g. an INVALID opcode be overwritten with a JUMP (label management uses this). + */ +DUK_LOCAL void duk__patch_jump(duk_compiler_ctx *comp_ctx, duk_int_t jump_pc, duk_int_t target_pc) { + duk_compiler_instr *instr; + duk_int_t offset; + + /* allow negative PCs, behave as a no-op */ + if (jump_pc < 0) { + DUK_DDD(DUK_DDDPRINT("duk__patch_jump(): nop call, jump_pc=%ld (<0), target_pc=%ld", + (long) jump_pc, (long) target_pc)); + return; + } + DUK_ASSERT(jump_pc >= 0); + + /* XXX: range assert */ + instr = duk__get_instr_ptr(comp_ctx, jump_pc); + DUK_ASSERT(instr != NULL); + + /* XXX: range assert */ + offset = target_pc - jump_pc - 1; + + instr->ins = DUK_ENC_OP_ABC(DUK_OP_JUMP, offset + DUK_BC_JUMP_BIAS); + DUK_DDD(DUK_DDDPRINT("duk__patch_jump(): jump_pc=%ld, target_pc=%ld, offset=%ld", + (long) jump_pc, (long) target_pc, (long) offset)); +} + +DUK_LOCAL void duk__patch_jump_here(duk_compiler_ctx *comp_ctx, duk_int_t jump_pc) { + duk__patch_jump(comp_ctx, jump_pc, duk__get_current_pc(comp_ctx)); +} + +DUK_LOCAL void duk__patch_trycatch(duk_compiler_ctx *comp_ctx, duk_int_t ldconst_pc, duk_int_t trycatch_pc, duk_regconst_t reg_catch, duk_regconst_t const_varname, duk_small_uint_t flags) { + duk_compiler_instr *instr; + + DUK_ASSERT(DUK__ISREG(reg_catch)); + + instr = duk__get_instr_ptr(comp_ctx, ldconst_pc); + DUK_ASSERT(DUK_DEC_OP(instr->ins) == DUK_OP_LDCONST); + DUK_ASSERT(instr != NULL); + if (const_varname & DUK__CONST_MARKER) { + /* Have a catch variable. */ + const_varname = const_varname & (~DUK__CONST_MARKER); + if (reg_catch > DUK_BC_BC_MAX || const_varname > DUK_BC_BC_MAX) { + /* Catch attempts to use out-of-range reg/const. Without this + * check Duktape 0.12.0 could generate invalid code which caused + * an assert failure on execution. This error is triggered e.g. + * for functions with a lot of constants and a try-catch statement. + * Shuffling or opcode semantics change is needed to fix the issue. + * See: test-bug-trycatch-many-constants.js. + */ + DUK_D(DUK_DPRINT("failed to patch trycatch: flags=%ld, reg_catch=%ld, const_varname=%ld (0x%08lx)", + (long) flags, (long) reg_catch, (long) const_varname, (long) const_varname)); + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_REG_LIMIT); + DUK_WO_NORETURN(return;); + } + instr->ins |= DUK_ENC_OP_A_BC(0, 0, const_varname); + } else { + /* No catch variable, e.g. a try-finally; replace LDCONST with + * NOP to avoid a bogus LDCONST. + */ + instr->ins = DUK_ENC_OP(DUK_OP_NOP); + } + + instr = duk__get_instr_ptr(comp_ctx, trycatch_pc); + DUK_ASSERT(instr != NULL); + DUK_ASSERT_DISABLE(flags >= DUK_BC_A_MIN); + DUK_ASSERT(flags <= DUK_BC_A_MAX); + instr->ins = DUK_ENC_OP_A_BC(DUK_OP_TRYCATCH, flags, reg_catch); +} + +DUK_LOCAL void duk__emit_if_false_skip(duk_compiler_ctx *comp_ctx, duk_regconst_t regconst) { + duk_small_uint_t op; + + op = DUK__ISREG(regconst) ? DUK_OP_IFFALSE_R : DUK_OP_IFFALSE_C; + duk__emit_bc(comp_ctx, op, regconst); /* helper will remove const flag */ +} + +DUK_LOCAL void duk__emit_if_true_skip(duk_compiler_ctx *comp_ctx, duk_regconst_t regconst) { + duk_small_uint_t op; + + op = DUK__ISREG(regconst) ? DUK_OP_IFTRUE_R : DUK_OP_IFTRUE_C; + duk__emit_bc(comp_ctx, op, regconst); /* helper will remove const flag */ +} + +DUK_LOCAL void duk__emit_invalid(duk_compiler_ctx *comp_ctx) { + duk__emit_op_only(comp_ctx, DUK_OP_INVALID); +} + +/* + * Peephole optimizer for finished bytecode. + * + * Does not remove opcodes; currently only straightens out unconditional + * jump chains which are generated by several control structures. + */ + +DUK_LOCAL void duk__peephole_optimize_bytecode(duk_compiler_ctx *comp_ctx) { + duk_compiler_instr *bc; + duk_small_uint_t iter; + duk_int_t i, n; + duk_int_t count_opt; + + bc = (duk_compiler_instr *) (void *) DUK_BW_GET_BASEPTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code); +#if defined(DUK_USE_BUFLEN16) + /* No need to assert, buffer size maximum is 0xffff. */ +#else + DUK_ASSERT((duk_size_t) DUK_BW_GET_SIZE(comp_ctx->thr, &comp_ctx->curr_func.bw_code) / sizeof(duk_compiler_instr) <= (duk_size_t) DUK_INT_MAX); /* bytecode limits */ +#endif + n = (duk_int_t) (DUK_BW_GET_SIZE(comp_ctx->thr, &comp_ctx->curr_func.bw_code) / sizeof(duk_compiler_instr)); + + for (iter = 0; iter < DUK_COMPILER_PEEPHOLE_MAXITER; iter++) { + count_opt = 0; + + for (i = 0; i < n; i++) { + duk_instr_t ins; + duk_int_t target_pc1; + duk_int_t target_pc2; + + ins = bc[i].ins; + if (DUK_DEC_OP(ins) != DUK_OP_JUMP) { + continue; + } + + target_pc1 = i + 1 + (duk_int_t) DUK_DEC_ABC(ins) - (duk_int_t) DUK_BC_JUMP_BIAS; + DUK_DDD(DUK_DDDPRINT("consider jump at pc %ld; target_pc=%ld", (long) i, (long) target_pc1)); + DUK_ASSERT(target_pc1 >= 0); + DUK_ASSERT(target_pc1 < n); + + /* Note: if target_pc1 == i, we'll optimize a jump to itself. + * This does not need to be checked for explicitly; the case + * is rare and max iter breaks us out. + */ + + ins = bc[target_pc1].ins; + if (DUK_DEC_OP(ins) != DUK_OP_JUMP) { + continue; + } + + target_pc2 = target_pc1 + 1 + (duk_int_t) DUK_DEC_ABC(ins) - (duk_int_t) DUK_BC_JUMP_BIAS; + + DUK_DDD(DUK_DDDPRINT("optimizing jump at pc %ld; old target is %ld -> new target is %ld", + (long) i, (long) target_pc1, (long) target_pc2)); + + bc[i].ins = DUK_ENC_OP_ABC(DUK_OP_JUMP, target_pc2 - (i + 1) + DUK_BC_JUMP_BIAS); + + count_opt++; + } + + DUK_DD(DUK_DDPRINT("optimized %ld jumps on peephole round %ld", (long) count_opt, (long) (iter + 1))); + + if (count_opt == 0) { + break; + } + } +} + +/* + * Intermediate value helpers + */ + +/* Flags for intermediate value coercions. A flag for using a forced reg + * is not needed, the forced_reg argument suffices and generates better + * code (it is checked as it is used). + */ +/* XXX: DUK__IVAL_FLAG_REQUIRE_SHORT is passed but not currently implemented + * by ispec/ivalue operations. + */ +#define DUK__IVAL_FLAG_ALLOW_CONST (1 << 0) /* allow a constant to be returned */ +#define DUK__IVAL_FLAG_REQUIRE_TEMP (1 << 1) /* require a (mutable) temporary as a result (or a const if allowed) */ +#define DUK__IVAL_FLAG_REQUIRE_SHORT (1 << 2) /* require a short (8-bit) reg/const which fits into bytecode B/C slot */ + +/* XXX: some code might benefit from DUK__SETTEMP_IFTEMP(thr,x) */ + +#if 0 /* enable manually for dumping */ +#define DUK__DUMP_ISPEC(compctx,ispec) do { duk__dump_ispec((compctx), (ispec)); } while (0) +#define DUK__DUMP_IVALUE(compctx,ivalue) do { duk__dump_ivalue((compctx), (ivalue)); } while (0) + +DUK_LOCAL void duk__dump_ispec(duk_compiler_ctx *comp_ctx, duk_ispec *x) { + DUK_D(DUK_DPRINT("ispec dump: t=%ld regconst=0x%08lx, valstack_idx=%ld, value=%!T", + (long) x->t, (unsigned long) x->regconst, (long) x->valstack_idx, + duk_get_tval(comp_ctx->thr, x->valstack_idx))); +} +DUK_LOCAL void duk__dump_ivalue(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + DUK_D(DUK_DPRINT("ivalue dump: t=%ld op=%ld " + "x1={t=%ld regconst=0x%08lx valstack_idx=%ld value=%!T} " + "x2={t=%ld regconst=0x%08lx valstack_idx=%ld value=%!T}", + (long) x->t, (long) x->op, + (long) x->x1.t, (unsigned long) x->x1.regconst, (long) x->x1.valstack_idx, + duk_get_tval(comp_ctx->thr, x->x1.valstack_idx), + (long) x->x2.t, (unsigned long) x->x2.regconst, (long) x->x2.valstack_idx, + duk_get_tval(comp_ctx->thr, x->x2.valstack_idx))); +} +#else +#define DUK__DUMP_ISPEC(comp_ctx,x) do {} while (0) +#define DUK__DUMP_IVALUE(comp_ctx,x) do {} while (0) +#endif + +DUK_LOCAL void duk__ivalue_regconst(duk_ivalue *x, duk_regconst_t regconst) { + x->t = DUK_IVAL_PLAIN; + x->x1.t = DUK_ISPEC_REGCONST; + x->x1.regconst = regconst; +} + +DUK_LOCAL void duk__ivalue_plain_fromstack(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + x->t = DUK_IVAL_PLAIN; + x->x1.t = DUK_ISPEC_VALUE; + duk_replace(comp_ctx->thr, x->x1.valstack_idx); +} + +DUK_LOCAL void duk__ivalue_var_fromstack(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + x->t = DUK_IVAL_VAR; + x->x1.t = DUK_ISPEC_VALUE; + duk_replace(comp_ctx->thr, x->x1.valstack_idx); +} + +DUK_LOCAL_DECL void duk__ivalue_var_hstring(duk_compiler_ctx *comp_ctx, duk_ivalue *x, duk_hstring *h) { + DUK_ASSERT(h != NULL); + duk_push_hstring(comp_ctx->thr, h); + duk__ivalue_var_fromstack(comp_ctx, x); +} + +DUK_LOCAL void duk__copy_ispec(duk_compiler_ctx *comp_ctx, duk_ispec *src, duk_ispec *dst) { + dst->t = src->t; + dst->regconst = src->regconst; + duk_copy(comp_ctx->thr, src->valstack_idx, dst->valstack_idx); +} + +DUK_LOCAL void duk__copy_ivalue(duk_compiler_ctx *comp_ctx, duk_ivalue *src, duk_ivalue *dst) { + dst->t = src->t; + dst->op = src->op; + dst->x1.t = src->x1.t; + dst->x1.regconst = src->x1.regconst; + dst->x2.t = src->x2.t; + dst->x2.regconst = src->x2.regconst; + duk_copy(comp_ctx->thr, src->x1.valstack_idx, dst->x1.valstack_idx); + duk_copy(comp_ctx->thr, src->x2.valstack_idx, dst->x2.valstack_idx); +} + +DUK_LOCAL duk_regconst_t duk__alloctemps(duk_compiler_ctx *comp_ctx, duk_small_int_t num) { + duk_regconst_t res; + + res = comp_ctx->curr_func.temp_next; + comp_ctx->curr_func.temp_next += num; + + if (comp_ctx->curr_func.temp_next > DUK__MAX_TEMPS) { /* == DUK__MAX_TEMPS is OK */ + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_TEMP_LIMIT); + DUK_WO_NORETURN(return 0;); + } + + /* maintain highest 'used' temporary, needed to figure out nregs of function */ + if (comp_ctx->curr_func.temp_next > comp_ctx->curr_func.temp_max) { + comp_ctx->curr_func.temp_max = comp_ctx->curr_func.temp_next; + } + + return res; +} + +DUK_LOCAL duk_regconst_t duk__alloctemp(duk_compiler_ctx *comp_ctx) { + return duk__alloctemps(comp_ctx, 1); +} + +DUK_LOCAL void duk__settemp_checkmax(duk_compiler_ctx *comp_ctx, duk_regconst_t temp_next) { + comp_ctx->curr_func.temp_next = temp_next; + if (temp_next > comp_ctx->curr_func.temp_max) { + comp_ctx->curr_func.temp_max = temp_next; + } +} + +/* get const for value at valstack top */ +DUK_LOCAL duk_regconst_t duk__getconst(duk_compiler_ctx *comp_ctx) { + duk_hthread *thr = comp_ctx->thr; + duk_compiler_func *f = &comp_ctx->curr_func; + duk_tval *tv1; + duk_int_t i, n, n_check; + + n = (duk_int_t) duk_get_length(thr, f->consts_idx); + + tv1 = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(tv1 != NULL); + +#if defined(DUK_USE_FASTINT) + /* Explicit check for fastint downgrade. */ + DUK_TVAL_CHKFAST_INPLACE_SLOW(tv1); +#endif + + /* Sanity workaround for handling functions with a large number of + * constants at least somewhat reasonably. Otherwise checking whether + * we already have the constant would grow very slow (as it is O(N^2)). + */ + n_check = (n > DUK__GETCONST_MAX_CONSTS_CHECK ? DUK__GETCONST_MAX_CONSTS_CHECK : n); + for (i = 0; i < n_check; i++) { + duk_tval *tv2 = DUK_HOBJECT_A_GET_VALUE_PTR(thr->heap, f->h_consts, i); + + /* Strict equality is NOT enough, because we cannot use the same + * constant for e.g. +0 and -0. + */ + if (duk_js_samevalue(tv1, tv2)) { + DUK_DDD(DUK_DDDPRINT("reused existing constant for %!T -> const index %ld", + (duk_tval *) tv1, (long) i)); + duk_pop(thr); + return (duk_regconst_t) i | (duk_regconst_t) DUK__CONST_MARKER; + } + } + + if (n > DUK__MAX_CONSTS) { + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_CONST_LIMIT); + DUK_WO_NORETURN(return 0;); + } + + DUK_DDD(DUK_DDDPRINT("allocating new constant for %!T -> const index %ld", + (duk_tval *) tv1, (long) n)); + (void) duk_put_prop_index(thr, f->consts_idx, (duk_uarridx_t) n); /* invalidates tv1, tv2 */ + return (duk_regconst_t) n | (duk_regconst_t) DUK__CONST_MARKER; +} + +DUK_LOCAL duk_bool_t duk__const_needs_refcount(duk_compiler_ctx *comp_ctx, duk_regconst_t rc) { +#if defined(DUK_USE_REFERENCE_COUNTING) + duk_compiler_func *f = &comp_ctx->curr_func; + duk_bool_t ret; + + DUK_ASSERT((rc & DUK__CONST_MARKER) == 0); /* caller removes const marker */ + (void) duk_get_prop_index(comp_ctx->thr, f->consts_idx, (duk_uarridx_t) rc); + ret = !duk_is_number(comp_ctx->thr, -1); /* now only number/string, so conservative check */ + duk_pop(comp_ctx->thr); + return ret; +#else + DUK_UNREF(comp_ctx); + DUK_UNREF(rc); + DUK_ASSERT((rc & DUK__CONST_MARKER) == 0); /* caller removes const marker */ + return 0; +#endif +} + +/* Get the value represented by an duk_ispec to a register or constant. + * The caller can control the result by indicating whether or not: + * + * (1) a constant is allowed (sometimes the caller needs the result to + * be in a register) + * + * (2) a temporary register is required (usually when caller requires + * the register to be safely mutable; normally either a bound + * register or a temporary register are both OK) + * + * (3) a forced register target needs to be used + * + * Bytecode may be emitted to generate the necessary value. The return + * value is either a register or a constant. + */ + +DUK_LOCAL +duk_regconst_t duk__ispec_toregconst_raw(duk_compiler_ctx *comp_ctx, + duk_ispec *x, + duk_regconst_t forced_reg, + duk_small_uint_t flags) { + duk_hthread *thr = comp_ctx->thr; + + DUK_DDD(DUK_DDDPRINT("duk__ispec_toregconst_raw(): x={%ld:%ld:%!T}, " + "forced_reg=%ld, flags 0x%08lx: allow_const=%ld require_temp=%ld require_short=%ld", + (long) x->t, + (long) x->regconst, + (duk_tval *) duk_get_tval(thr, x->valstack_idx), + (long) forced_reg, + (unsigned long) flags, + (long) ((flags & DUK__IVAL_FLAG_ALLOW_CONST) ? 1 : 0), + (long) ((flags & DUK__IVAL_FLAG_REQUIRE_TEMP) ? 1 : 0), + (long) ((flags & DUK__IVAL_FLAG_REQUIRE_SHORT) ? 1 : 0))); + + switch (x->t) { + case DUK_ISPEC_VALUE: { + duk_tval *tv; + + tv = DUK_GET_TVAL_POSIDX(thr, x->valstack_idx); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: { + /* Note: although there is no 'undefined' literal, undefined + * values can occur during compilation as a result of e.g. + * the 'void' operator. + */ + duk_regconst_t dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_bc(comp_ctx, DUK_OP_LDUNDEF, dest); + return dest; + } + case DUK_TAG_NULL: { + duk_regconst_t dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_bc(comp_ctx, DUK_OP_LDNULL, dest); + return dest; + } + case DUK_TAG_BOOLEAN: { + duk_regconst_t dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_bc(comp_ctx, + (DUK_TVAL_GET_BOOLEAN(tv) ? DUK_OP_LDTRUE : DUK_OP_LDFALSE), + dest); + return dest; + } + case DUK_TAG_POINTER: { + DUK_UNREACHABLE(); + break; + } + case DUK_TAG_STRING: { + duk_hstring *h; + duk_regconst_t dest; + duk_regconst_t constidx; + + h = DUK_TVAL_GET_STRING(tv); + DUK_UNREF(h); + DUK_ASSERT(h != NULL); + +#if 0 /* XXX: to be implemented? */ + /* Use special opcodes to load short strings */ + if (DUK_HSTRING_GET_BYTELEN(h) <= 2) { + /* Encode into a single opcode (18 bits can encode 1-2 bytes + length indicator) */ + } else if (DUK_HSTRING_GET_BYTELEN(h) <= 6) { + /* Encode into a double constant (53 bits can encode 6*8 = 48 bits + 3-bit length */ + } +#endif + duk_dup(thr, x->valstack_idx); + constidx = duk__getconst(comp_ctx); + + if (flags & DUK__IVAL_FLAG_ALLOW_CONST) { + return constidx; + } + + dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_a_bc(comp_ctx, DUK_OP_LDCONST, dest, constidx); + return dest; + } + case DUK_TAG_OBJECT: { + DUK_UNREACHABLE(); + break; + } + case DUK_TAG_BUFFER: { + DUK_UNREACHABLE(); + break; + } + case DUK_TAG_LIGHTFUNC: { + DUK_UNREACHABLE(); + break; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + /* number */ + duk_regconst_t dest; + duk_regconst_t constidx; + duk_double_t dval; + duk_int32_t ival; + + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + dval = DUK_TVAL_GET_NUMBER(tv); + + if (!(flags & DUK__IVAL_FLAG_ALLOW_CONST)) { + /* A number can be loaded either through a constant, using + * LDINT, or using LDINT+LDINTX. LDINT is always a size win, + * LDINT+LDINTX is not if the constant is used multiple times. + * Currently always prefer LDINT+LDINTX over a double constant. + */ + + if (duk_is_whole_get_int32_nonegzero(dval, &ival)) { + dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_load_int32(comp_ctx, dest, ival); + return dest; + } + } + + duk_dup(thr, x->valstack_idx); + constidx = duk__getconst(comp_ctx); + + if (flags & DUK__IVAL_FLAG_ALLOW_CONST) { + return constidx; + } else { + dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_a_bc(comp_ctx, DUK_OP_LDCONST, dest, constidx); + return dest; + } + } + } /* end switch */ + goto fail_internal; /* never here */ + } + case DUK_ISPEC_REGCONST: { + if (forced_reg >= 0) { + if (DUK__ISCONST(x->regconst)) { + duk__emit_a_bc(comp_ctx, DUK_OP_LDCONST, forced_reg, x->regconst); + } else if (x->regconst != forced_reg) { + duk__emit_a_bc(comp_ctx, DUK_OP_LDREG, forced_reg, x->regconst); + } else { + ; /* already in correct reg */ + } + return forced_reg; + } + + DUK_ASSERT(forced_reg < 0); + if (DUK__ISCONST(x->regconst)) { + if (!(flags & DUK__IVAL_FLAG_ALLOW_CONST)) { + duk_regconst_t dest = DUK__ALLOCTEMP(comp_ctx); + duk__emit_a_bc(comp_ctx, DUK_OP_LDCONST, dest, x->regconst); + return dest; + } + return x->regconst; + } + + DUK_ASSERT(forced_reg < 0 && !DUK__ISCONST(x->regconst)); + if ((flags & DUK__IVAL_FLAG_REQUIRE_TEMP) && !DUK__ISREG_TEMP(comp_ctx, x->regconst)) { + duk_regconst_t dest = DUK__ALLOCTEMP(comp_ctx); + duk__emit_a_bc(comp_ctx, DUK_OP_LDREG, dest, x->regconst); + return dest; + } + return x->regconst; + } + default: { + break; /* never here */ + } + } + + fail_internal: + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); +} + +DUK_LOCAL void duk__ispec_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ispec *x, duk_regconst_t forced_reg) { + DUK_ASSERT(forced_reg >= 0); + (void) duk__ispec_toregconst_raw(comp_ctx, x, forced_reg, 0 /*flags*/); +} + +/* Coerce an duk_ivalue to a 'plain' value by generating the necessary + * arithmetic operations, property access, or variable access bytecode. + * The duk_ivalue argument ('x') is converted into a plain value as a + * side effect. + */ +DUK_LOCAL void duk__ivalue_toplain_raw(duk_compiler_ctx *comp_ctx, duk_ivalue *x, duk_regconst_t forced_reg) { + duk_hthread *thr = comp_ctx->thr; + + DUK_DDD(DUK_DDDPRINT("duk__ivalue_toplain_raw(): x={t=%ld,op=%ld,x1={%ld:%ld:%!T},x2={%ld:%ld:%!T}}, " + "forced_reg=%ld", + (long) x->t, (long) x->op, + (long) x->x1.t, (long) x->x1.regconst, + (duk_tval *) duk_get_tval(thr, x->x1.valstack_idx), + (long) x->x2.t, (long) x->x2.regconst, + (duk_tval *) duk_get_tval(thr, x->x2.valstack_idx), + (long) forced_reg)); + + switch (x->t) { + case DUK_IVAL_PLAIN: { + return; + } + /* XXX: support unary arithmetic ivalues (useful?) */ + case DUK_IVAL_ARITH: { + duk_regconst_t arg1; + duk_regconst_t arg2; + duk_regconst_t dest; + duk_tval *tv1; + duk_tval *tv2; + + DUK_DDD(DUK_DDDPRINT("arith to plain conversion")); + + /* inline arithmetic check for constant values */ + /* XXX: use the exactly same arithmetic function here as in executor */ + if (x->x1.t == DUK_ISPEC_VALUE && x->x2.t == DUK_ISPEC_VALUE && x->t == DUK_IVAL_ARITH) { + tv1 = DUK_GET_TVAL_POSIDX(thr, x->x1.valstack_idx); + tv2 = DUK_GET_TVAL_POSIDX(thr, x->x2.valstack_idx); + DUK_ASSERT(tv1 != NULL); + DUK_ASSERT(tv2 != NULL); + + DUK_DDD(DUK_DDDPRINT("arith: tv1=%!T, tv2=%!T", + (duk_tval *) tv1, + (duk_tval *) tv2)); + + if (DUK_TVAL_IS_NUMBER(tv1) && DUK_TVAL_IS_NUMBER(tv2)) { + duk_double_t d1 = DUK_TVAL_GET_NUMBER(tv1); + duk_double_t d2 = DUK_TVAL_GET_NUMBER(tv2); + duk_double_t d3; + duk_bool_t accept_fold = 1; + + DUK_DDD(DUK_DDDPRINT("arith inline check: d1=%lf, d2=%lf, op=%ld", + (double) d1, (double) d2, (long) x->op)); + switch (x->op) { + case DUK_OP_ADD: { + d3 = d1 + d2; + break; + } + case DUK_OP_SUB: { + d3 = d1 - d2; + break; + } + case DUK_OP_MUL: { + d3 = d1 * d2; + break; + } + case DUK_OP_DIV: { + /* Division-by-zero is undefined + * behavior, so rely on a helper. + */ + d3 = duk_double_div(d1, d2); + break; + } + case DUK_OP_EXP: { + d3 = (duk_double_t) duk_js_arith_pow((double) d1, (double) d2); + break; + } + default: { + d3 = 0.0; /* Won't be used, but silence MSVC /W4 warning. */ + accept_fold = 0; + break; + } + } + + if (accept_fold) { + duk_double_union du; + du.d = d3; + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + d3 = du.d; + + x->t = DUK_IVAL_PLAIN; + DUK_ASSERT(x->x1.t == DUK_ISPEC_VALUE); + DUK_TVAL_SET_NUMBER(tv1, d3); /* old value is number: no refcount */ + return; + } + } else if (x->op == DUK_OP_ADD && DUK_TVAL_IS_STRING(tv1) && DUK_TVAL_IS_STRING(tv2)) { + /* Inline string concatenation. No need to check for + * symbols, as all inputs are valid ECMAScript strings. + */ + duk_dup(thr, x->x1.valstack_idx); + duk_dup(thr, x->x2.valstack_idx); + duk_concat(thr, 2); + duk_replace(thr, x->x1.valstack_idx); + x->t = DUK_IVAL_PLAIN; + DUK_ASSERT(x->x1.t == DUK_ISPEC_VALUE); + return; + } + } + + arg1 = duk__ispec_toregconst_raw(comp_ctx, &x->x1, -1, DUK__IVAL_FLAG_ALLOW_CONST | DUK__IVAL_FLAG_REQUIRE_SHORT /*flags*/); + arg2 = duk__ispec_toregconst_raw(comp_ctx, &x->x2, -1, DUK__IVAL_FLAG_ALLOW_CONST | DUK__IVAL_FLAG_REQUIRE_SHORT /*flags*/); + + /* If forced reg, use it as destination. Otherwise try to + * use either coerced ispec if it is a temporary. + */ + if (forced_reg >= 0) { + dest = forced_reg; + } else if (DUK__ISREG_TEMP(comp_ctx, arg1)) { + dest = arg1; + } else if (DUK__ISREG_TEMP(comp_ctx, arg2)) { + dest = arg2; + } else { + dest = DUK__ALLOCTEMP(comp_ctx); + } + + DUK_ASSERT(DUK__ISREG(dest)); + duk__emit_a_b_c(comp_ctx, x->op | DUK__EMIT_FLAG_BC_REGCONST, dest, arg1, arg2); + + duk__ivalue_regconst(x, dest); + return; + } + case DUK_IVAL_PROP: { + /* XXX: very similar to DUK_IVAL_ARITH - merge? */ + duk_regconst_t arg1; + duk_regconst_t arg2; + duk_regconst_t dest; + + /* Need a short reg/const, does not have to be a mutable temp. */ + arg1 = duk__ispec_toregconst_raw(comp_ctx, &x->x1, -1, DUK__IVAL_FLAG_ALLOW_CONST | DUK__IVAL_FLAG_REQUIRE_SHORT /*flags*/); + arg2 = duk__ispec_toregconst_raw(comp_ctx, &x->x2, -1, DUK__IVAL_FLAG_ALLOW_CONST | DUK__IVAL_FLAG_REQUIRE_SHORT /*flags*/); + + /* Pick a destination register. If either base value or key + * happens to be a temp value, reuse it as the destination. + * + * XXX: The temp must be a "mutable" one, i.e. such that no + * other expression is using it anymore. Here this should be + * the case because the value of a property access expression + * is neither the base nor the key, but the lookup result. + */ + + if (forced_reg >= 0) { + dest = forced_reg; + } else if (DUK__ISREG_TEMP(comp_ctx, arg1)) { + dest = arg1; + } else if (DUK__ISREG_TEMP(comp_ctx, arg2)) { + dest = arg2; + } else { + dest = DUK__ALLOCTEMP(comp_ctx); + } + + duk__emit_a_b_c(comp_ctx, + DUK_OP_GETPROP | DUK__EMIT_FLAG_BC_REGCONST, + dest, + arg1, + arg2); + + duk__ivalue_regconst(x, dest); + return; + } + case DUK_IVAL_VAR: { + /* x1 must be a string */ + duk_regconst_t dest; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + DUK_ASSERT(x->x1.t == DUK_ISPEC_VALUE); + + duk_dup(thr, x->x1.valstack_idx); + if (duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + duk__ivalue_regconst(x, reg_varbind); + } else { + dest = (forced_reg >= 0 ? forced_reg : DUK__ALLOCTEMP(comp_ctx)); + duk__emit_a_bc(comp_ctx, DUK_OP_GETVAR, dest, rc_varname); + duk__ivalue_regconst(x, dest); + } + return; + } + case DUK_IVAL_NONE: + default: { + DUK_D(DUK_DPRINT("invalid ivalue type: %ld", (long) x->t)); + break; + } + } + + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return;); +} + +/* evaluate to plain value, no forced register (temp/bound reg both ok) */ +DUK_LOCAL void duk__ivalue_toplain(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + duk__ivalue_toplain_raw(comp_ctx, x, -1 /*forced_reg*/); +} + +/* evaluate to final form (e.g. coerce GETPROP to code), throw away temp */ +DUK_LOCAL void duk__ivalue_toplain_ignore(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + duk_regconst_t temp; + + /* If duk__ivalue_toplain_raw() allocates a temp, forget it and + * restore next temp state. + */ + temp = DUK__GETTEMP(comp_ctx); + duk__ivalue_toplain_raw(comp_ctx, x, -1 /*forced_reg*/); + DUK__SETTEMP(comp_ctx, temp); +} + +/* Coerce an duk_ivalue to a register or constant; result register may + * be a temp or a bound register. + * + * The duk_ivalue argument ('x') is converted into a regconst as a + * side effect. + */ +DUK_LOCAL +duk_regconst_t duk__ivalue_toregconst_raw(duk_compiler_ctx *comp_ctx, + duk_ivalue *x, + duk_regconst_t forced_reg, + duk_small_uint_t flags) { + duk_hthread *thr = comp_ctx->thr; + duk_regconst_t reg; + DUK_UNREF(thr); + + DUK_DDD(DUK_DDDPRINT("duk__ivalue_toregconst_raw(): x={t=%ld,op=%ld,x1={%ld:%ld:%!T},x2={%ld:%ld:%!T}}, " + "forced_reg=%ld, flags 0x%08lx: allow_const=%ld require_temp=%ld require_short=%ld", + (long) x->t, (long) x->op, + (long) x->x1.t, (long) x->x1.regconst, + (duk_tval *) duk_get_tval(thr, x->x1.valstack_idx), + (long) x->x2.t, (long) x->x2.regconst, + (duk_tval *) duk_get_tval(thr, x->x2.valstack_idx), + (long) forced_reg, + (unsigned long) flags, + (long) ((flags & DUK__IVAL_FLAG_ALLOW_CONST) ? 1 : 0), + (long) ((flags & DUK__IVAL_FLAG_REQUIRE_TEMP) ? 1 : 0), + (long) ((flags & DUK__IVAL_FLAG_REQUIRE_SHORT) ? 1 : 0))); + + /* first coerce to a plain value */ + duk__ivalue_toplain_raw(comp_ctx, x, forced_reg); + DUK_ASSERT(x->t == DUK_IVAL_PLAIN); + + /* then to a register */ + reg = duk__ispec_toregconst_raw(comp_ctx, &x->x1, forced_reg, flags); + duk__ivalue_regconst(x, reg); + + return reg; +} + +DUK_LOCAL duk_regconst_t duk__ivalue_toreg(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + return duk__ivalue_toregconst_raw(comp_ctx, x, -1, 0 /*flags*/); +} + +#if 0 /* unused */ +DUK_LOCAL duk_regconst_t duk__ivalue_totemp(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + return duk__ivalue_toregconst_raw(comp_ctx, x, -1, DUK__IVAL_FLAG_REQUIRE_TEMP /*flags*/); +} +#endif + +DUK_LOCAL void duk__ivalue_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ivalue *x, duk_int_t forced_reg) { + DUK_ASSERT(forced_reg >= 0); + (void) duk__ivalue_toregconst_raw(comp_ctx, x, forced_reg, 0 /*flags*/); +} + +DUK_LOCAL duk_regconst_t duk__ivalue_toregconst(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + return duk__ivalue_toregconst_raw(comp_ctx, x, -1, DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); +} + +DUK_LOCAL duk_regconst_t duk__ivalue_totempconst(duk_compiler_ctx *comp_ctx, duk_ivalue *x) { + return duk__ivalue_toregconst_raw(comp_ctx, x, -1, DUK__IVAL_FLAG_ALLOW_CONST | DUK__IVAL_FLAG_REQUIRE_TEMP /*flags*/); +} + +/* The issues below can be solved with better flags */ + +/* XXX: many operations actually want toforcedtemp() -- brand new temp? */ +/* XXX: need a toplain_ignore() which will only coerce a value to a temp + * register if it might have a side effect. Side-effect free values do not + * need to be coerced. + */ + +/* + * Identifier handling + */ + +DUK_LOCAL duk_regconst_t duk__lookup_active_register_binding(duk_compiler_ctx *comp_ctx) { + duk_hthread *thr = comp_ctx->thr; + duk_hstring *h_varname; + duk_regconst_t ret; + + DUK_DDD(DUK_DDDPRINT("resolving identifier reference to '%!T'", + (duk_tval *) duk_get_tval(thr, -1))); + + /* + * Special name handling + */ + + h_varname = duk_known_hstring(thr, -1); + + if (h_varname == DUK_HTHREAD_STRING_LC_ARGUMENTS(thr)) { + DUK_DDD(DUK_DDDPRINT("flagging function as accessing 'arguments'")); + comp_ctx->curr_func.id_access_arguments = 1; + } + + /* + * Inside one or more 'with' statements fall back to slow path always. + * (See e.g. test-stmt-with.js.) + */ + + if (comp_ctx->curr_func.with_depth > 0) { + DUK_DDD(DUK_DDDPRINT("identifier lookup inside a 'with' -> fall back to slow path")); + goto slow_path_own; + } + + /* + * Any catch bindings ("catch (e)") also affect identifier binding. + * + * Currently, the varmap is modified for the duration of the catch + * clause to ensure any identifier accesses with the catch variable + * name will use slow path. + */ + + duk_get_prop(thr, comp_ctx->curr_func.varmap_idx); + if (duk_is_number(thr, -1)) { + ret = duk_to_int(thr, -1); + duk_pop(thr); + } else { + duk_pop(thr); + if (comp_ctx->curr_func.catch_depth > 0 || comp_ctx->curr_func.with_depth > 0) { + DUK_DDD(DUK_DDDPRINT("slow path access from inside a try-catch or with needs _Varmap")); + goto slow_path_own; + } else { + /* In this case we're doing a variable lookup that doesn't + * match our own variables, so _Varmap won't be needed at + * run time. + */ + DUK_DDD(DUK_DDDPRINT("slow path access outside of try-catch and with, no need for _Varmap")); + goto slow_path_notown; + } + } + + DUK_DDD(DUK_DDDPRINT("identifier lookup -> reg %ld", (long) ret)); + return ret; + + slow_path_notown: + DUK_DDD(DUK_DDDPRINT("identifier lookup -> slow path, not own variable")); + + comp_ctx->curr_func.id_access_slow = 1; + return (duk_regconst_t) -1; + + slow_path_own: + DUK_DDD(DUK_DDDPRINT("identifier lookup -> slow path, may be own variable")); + + comp_ctx->curr_func.id_access_slow = 1; + comp_ctx->curr_func.id_access_slow_own = 1; + return (duk_regconst_t) -1; +} + +/* Lookup an identifier name in the current varmap, indicating whether the + * identifier is register-bound and if not, allocating a constant for the + * identifier name. Returns 1 if register-bound, 0 otherwise. Caller can + * also check (out_reg_varbind >= 0) to check whether or not identifier is + * register bound. The caller must NOT use out_rc_varname at all unless + * return code is 0 or out_reg_varbind is < 0; this is becuase out_rc_varname + * is unsigned and doesn't have a "unused" / none value. + */ +DUK_LOCAL duk_bool_t duk__lookup_lhs(duk_compiler_ctx *comp_ctx, duk_regconst_t *out_reg_varbind, duk_regconst_t *out_rc_varname) { + duk_hthread *thr = comp_ctx->thr; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + /* [ ... varname ] */ + + duk_dup_top(thr); + reg_varbind = duk__lookup_active_register_binding(comp_ctx); + + if (reg_varbind >= 0) { + *out_reg_varbind = reg_varbind; + *out_rc_varname = 0; /* duk_regconst_t is unsigned, so use 0 as dummy value (ignored by caller) */ + duk_pop(thr); + return 1; + } else { + rc_varname = duk__getconst(comp_ctx); + *out_reg_varbind = -1; + *out_rc_varname = rc_varname; + return 0; + } +} + +/* + * Label handling + * + * Labels are initially added with flags prohibiting both break and continue. + * When the statement type is finally uncovered (after potentially multiple + * labels), all the labels are updated to allow/prohibit break and continue. + */ + +DUK_LOCAL void duk__add_label(duk_compiler_ctx *comp_ctx, duk_hstring *h_label, duk_int_t pc_label, duk_int_t label_id) { + duk_hthread *thr = comp_ctx->thr; + duk_size_t n; + duk_size_t new_size; + duk_uint8_t *p; + duk_labelinfo *li_start, *li; + + /* Duplicate (shadowing) labels are not allowed, except for the empty + * labels (which are used as default labels for switch and iteration + * statements). + * + * We could also allow shadowing of non-empty pending labels without any + * other issues than breaking the required label shadowing requirements + * of the E5 specification, see Section 12.12. + */ + + p = (duk_uint8_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, comp_ctx->curr_func.h_labelinfos); + li_start = (duk_labelinfo *) (void *) p; + li = (duk_labelinfo *) (void *) (p + DUK_HBUFFER_GET_SIZE(comp_ctx->curr_func.h_labelinfos)); + n = (duk_size_t) (li - li_start); + + while (li > li_start) { + li--; + + if (li->h_label == h_label && h_label != DUK_HTHREAD_STRING_EMPTY_STRING(thr)) { + DUK_ERROR_SYNTAX(thr, DUK_STR_DUPLICATE_LABEL); + DUK_WO_NORETURN(return;); + } + } + + duk_push_hstring(thr, h_label); + DUK_ASSERT(n <= DUK_UARRIDX_MAX); /* label limits */ + (void) duk_put_prop_index(thr, comp_ctx->curr_func.labelnames_idx, (duk_uarridx_t) n); + + new_size = (n + 1) * sizeof(duk_labelinfo); + duk_hbuffer_resize(thr, comp_ctx->curr_func.h_labelinfos, new_size); + /* XXX: slack handling, slow now */ + + /* relookup after possible realloc */ + p = (duk_uint8_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, comp_ctx->curr_func.h_labelinfos); + li_start = (duk_labelinfo *) (void *) p; + DUK_UNREF(li_start); /* silence scan-build warning */ + li = (duk_labelinfo *) (void *) (p + DUK_HBUFFER_GET_SIZE(comp_ctx->curr_func.h_labelinfos)); + li--; + + /* Labels can be used for iteration statements but also for other statements, + * in particular a label can be used for a block statement. All cases of a + * named label accept a 'break' so that flag is set here. Iteration statements + * also allow 'continue', so that flag is updated when we figure out the + * statement type. + */ + + li->flags = DUK_LABEL_FLAG_ALLOW_BREAK; + li->label_id = label_id; + li->h_label = h_label; + li->catch_depth = comp_ctx->curr_func.catch_depth; /* catch depth from current func */ + li->pc_label = pc_label; + + DUK_DDD(DUK_DDDPRINT("registered label: flags=0x%08lx, id=%ld, name=%!O, catch_depth=%ld, pc_label=%ld", + (unsigned long) li->flags, (long) li->label_id, (duk_heaphdr *) li->h_label, + (long) li->catch_depth, (long) li->pc_label)); +} + +/* Update all labels with matching label_id. */ +DUK_LOCAL void duk__update_label_flags(duk_compiler_ctx *comp_ctx, duk_int_t label_id, duk_small_uint_t flags) { + duk_uint8_t *p; + duk_labelinfo *li_start, *li; + + p = (duk_uint8_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(comp_ctx->thr->heap, comp_ctx->curr_func.h_labelinfos); + li_start = (duk_labelinfo *) (void *) p; + li = (duk_labelinfo *) (void *) (p + DUK_HBUFFER_GET_SIZE(comp_ctx->curr_func.h_labelinfos)); + + /* Match labels starting from latest; once label_id no longer matches, we can + * safely exit without checking the rest of the labels (only the topmost labels + * are ever updated). + */ + while (li > li_start) { + li--; + + if (li->label_id != label_id) { + break; + } + + DUK_DDD(DUK_DDDPRINT("updating (overwriting) label flags for li=%p, label_id=%ld, flags=%ld", + (void *) li, (long) label_id, (long) flags)); + + li->flags = flags; + } +} + +/* Lookup active label information. Break/continue distinction is necessary to handle switch + * statement related labels correctly: a switch will only catch a 'break', not a 'continue'. + * + * An explicit label cannot appear multiple times in the active set, but empty labels (unlabelled + * iteration and switch statements) can. A break will match the closest unlabelled or labelled + * statement. A continue will match the closest unlabelled or labelled iteration statement. It is + * a syntax error if a continue matches a labelled switch statement; because an explicit label cannot + * be duplicated, the continue cannot match any valid label outside the switch. + * + * A side effect of these rules is that a LABEL statement related to a switch should never actually + * catch a continue abrupt completion at run-time. Hence an INVALID opcode can be placed in the + * continue slot of the switch's LABEL statement. + */ + +/* XXX: awkward, especially the bunch of separate output values -> output struct? */ +DUK_LOCAL void duk__lookup_active_label(duk_compiler_ctx *comp_ctx, duk_hstring *h_label, duk_bool_t is_break, duk_int_t *out_label_id, duk_int_t *out_label_catch_depth, duk_int_t *out_label_pc, duk_bool_t *out_is_closest) { + duk_hthread *thr = comp_ctx->thr; + duk_uint8_t *p; + duk_labelinfo *li_start, *li_end, *li; + duk_bool_t match = 0; + + DUK_DDD(DUK_DDDPRINT("looking up active label: label='%!O', is_break=%ld", + (duk_heaphdr *) h_label, (long) is_break)); + + DUK_UNREF(thr); + + p = (duk_uint8_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, comp_ctx->curr_func.h_labelinfos); + li_start = (duk_labelinfo *) (void *) p; + li_end = (duk_labelinfo *) (void *) (p + DUK_HBUFFER_GET_SIZE(comp_ctx->curr_func.h_labelinfos)); + li = li_end; + + /* Match labels starting from latest label because there can be duplicate empty + * labels in the label set. + */ + while (li > li_start) { + li--; + + if (li->h_label != h_label) { + DUK_DDD(DUK_DDDPRINT("labelinfo[%ld] ->'%!O' != %!O", + (long) (li - li_start), + (duk_heaphdr *) li->h_label, + (duk_heaphdr *) h_label)); + continue; + } + + DUK_DDD(DUK_DDDPRINT("labelinfo[%ld] -> '%!O' label name matches (still need to check type)", + (long) (li - li_start), (duk_heaphdr *) h_label)); + + /* currently all labels accept a break, so no explicit check for it now */ + DUK_ASSERT(li->flags & DUK_LABEL_FLAG_ALLOW_BREAK); + + if (is_break) { + /* break matches always */ + match = 1; + break; + } else if (li->flags & DUK_LABEL_FLAG_ALLOW_CONTINUE) { + /* iteration statements allow continue */ + match = 1; + break; + } else { + /* continue matched this label -- we can only continue if this is the empty + * label, for which duplication is allowed, and thus there is hope of + * finding a match deeper in the label stack. + */ + if (h_label != DUK_HTHREAD_STRING_EMPTY_STRING(thr)) { + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_LABEL); + DUK_WO_NORETURN(return;); + } else { + DUK_DDD(DUK_DDDPRINT("continue matched an empty label which does not " + "allow a continue -> continue lookup deeper in label stack")); + } + } + } + /* XXX: match flag is awkward, rework */ + if (!match) { + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_LABEL); + DUK_WO_NORETURN(return;); + } + + DUK_DDD(DUK_DDDPRINT("label match: %!O -> label_id %ld, catch_depth=%ld, pc_label=%ld", + (duk_heaphdr *) h_label, (long) li->label_id, + (long) li->catch_depth, (long) li->pc_label)); + + *out_label_id = li->label_id; + *out_label_catch_depth = li->catch_depth; + *out_label_pc = li->pc_label; + *out_is_closest = (li == li_end - 1); +} + +DUK_LOCAL void duk__reset_labels_to_length(duk_compiler_ctx *comp_ctx, duk_size_t len) { + duk_hthread *thr = comp_ctx->thr; + + duk_set_length(thr, comp_ctx->curr_func.labelnames_idx, len); + duk_hbuffer_resize(thr, comp_ctx->curr_func.h_labelinfos, sizeof(duk_labelinfo) * len); +} + +/* + * Expression parsing: duk__expr_nud(), duk__expr_led(), duk__expr_lbp(), and helpers. + * + * - duk__expr_nud(): ("null denotation"): process prev_token as a "start" of an expression (e.g. literal) + * - duk__expr_led(): ("left denotation"): process prev_token in the "middle" of an expression (e.g. operator) + * - duk__expr_lbp(): ("left-binding power"): return left-binding power of curr_token + */ + +/* object literal key tracking flags */ +#define DUK__OBJ_LIT_KEY_PLAIN (1 << 0) /* key encountered as a plain property */ +#define DUK__OBJ_LIT_KEY_GET (1 << 1) /* key encountered as a getter */ +#define DUK__OBJ_LIT_KEY_SET (1 << 2) /* key encountered as a setter */ + +DUK_LOCAL void duk__nud_array_literal(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk_regconst_t reg_obj; /* result reg */ + duk_regconst_t reg_temp; /* temp reg */ + duk_regconst_t temp_start; /* temp reg value for start of loop */ + duk_small_uint_t max_init_values; /* max # of values initialized in one MPUTARR set */ + duk_small_uint_t num_values; /* number of values in current MPUTARR set */ + duk_uarridx_t curr_idx; /* current (next) array index */ + duk_uarridx_t start_idx; /* start array index of current MPUTARR set */ + duk_uarridx_t init_idx; /* last array index explicitly initialized, +1 */ + duk_bool_t require_comma; /* next loop requires a comma */ +#if !defined(DUK_USE_PREFER_SIZE) + duk_int_t pc_newarr; + duk_compiler_instr *instr; +#endif + + /* DUK_TOK_LBRACKET already eaten, current token is right after that */ + DUK_ASSERT(comp_ctx->prev_token.t == DUK_TOK_LBRACKET); + + max_init_values = DUK__MAX_ARRAY_INIT_VALUES; /* XXX: depend on available temps? */ + + reg_obj = DUK__ALLOCTEMP(comp_ctx); +#if !defined(DUK_USE_PREFER_SIZE) + pc_newarr = duk__get_current_pc(comp_ctx); +#endif + duk__emit_bc(comp_ctx, DUK_OP_NEWARR, reg_obj); /* XXX: patch initial size hint afterwards? */ + temp_start = DUK__GETTEMP(comp_ctx); + + /* + * Emit initializers in sets of maximum max_init_values. + * Corner cases such as single value initializers do not have + * special handling now. + * + * Elided elements must not be emitted as 'undefined' values, + * because such values would be enumerable (which is incorrect). + * Also note that trailing elisions must be reflected in the + * length of the final array but cause no elements to be actually + * inserted. + */ + + curr_idx = 0; + init_idx = 0; /* tracks maximum initialized index + 1 */ + start_idx = 0; + require_comma = 0; + + for (;;) { + num_values = 0; + DUK__SETTEMP(comp_ctx, temp_start); + + if (comp_ctx->curr_token.t == DUK_TOK_RBRACKET) { + break; + } + + for (;;) { + if (comp_ctx->curr_token.t == DUK_TOK_RBRACKET) { + /* the outer loop will recheck and exit */ + break; + } + + /* comma check */ + if (require_comma) { + if (comp_ctx->curr_token.t == DUK_TOK_COMMA) { + /* comma after a value, expected */ + duk__advance(comp_ctx); + require_comma = 0; + continue; + } else { + goto syntax_error; + } + } else { + if (comp_ctx->curr_token.t == DUK_TOK_COMMA) { + /* elision - flush */ + curr_idx++; + duk__advance(comp_ctx); + /* if num_values > 0, MPUTARR emitted by outer loop after break */ + break; + } + } + /* else an array initializer element */ + + /* initial index */ + if (num_values == 0) { + start_idx = curr_idx; + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__emit_load_int32(comp_ctx, reg_temp, (duk_int32_t) start_idx); + } + + reg_temp = DUK__ALLOCTEMP(comp_ctx); /* alloc temp just in case, to update max temp */ + DUK__SETTEMP(comp_ctx, reg_temp); + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_COMMA /*rbp_flags*/, reg_temp /*forced_reg*/); + DUK__SETTEMP(comp_ctx, reg_temp + 1); + + num_values++; + curr_idx++; + require_comma = 1; + + if (num_values >= max_init_values) { + /* MPUTARR emitted by outer loop */ + break; + } + } + + if (num_values > 0) { + /* - A is a source register (it's not a write target, but used + * to identify the target object) but can be shuffled. + * - B cannot be shuffled normally because it identifies a range + * of registers, the emitter has special handling for this + * (the "no shuffle" flag must not be set). + * - C is a non-register number and cannot be shuffled, but + * never needs to be. + */ + duk__emit_a_b_c(comp_ctx, + DUK_OP_MPUTARR | + DUK__EMIT_FLAG_NO_SHUFFLE_C | + DUK__EMIT_FLAG_A_IS_SOURCE, + reg_obj, + temp_start, + (duk_regconst_t) (num_values + 1)); + init_idx = start_idx + num_values; + + /* num_values and temp_start reset at top of outer loop */ + } + } + + /* Update initil size for NEWARR, doesn't need to be exact and is + * capped at A field limit. + */ +#if !defined(DUK_USE_PREFER_SIZE) + instr = duk__get_instr_ptr(comp_ctx, pc_newarr); + instr->ins |= DUK_ENC_OP_A(0, curr_idx > DUK_BC_A_MAX ? DUK_BC_A_MAX : curr_idx); +#endif + + DUK_ASSERT(comp_ctx->curr_token.t == DUK_TOK_RBRACKET); + duk__advance(comp_ctx); + + DUK_DDD(DUK_DDDPRINT("array literal done, curridx=%ld, initidx=%ld", + (long) curr_idx, (long) init_idx)); + + /* trailing elisions? */ + if (curr_idx > init_idx) { + /* yes, must set array length explicitly */ + DUK_DDD(DUK_DDDPRINT("array literal has trailing elisions which affect its length")); + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__emit_load_int32(comp_ctx, reg_temp, (duk_int_t) curr_idx); + duk__emit_a_bc(comp_ctx, + DUK_OP_SETALEN | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_obj, + reg_temp); + } + + DUK__SETTEMP(comp_ctx, temp_start); + + duk__ivalue_regconst(res, reg_obj); + return; + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_ARRAY_LITERAL); + DUK_WO_NORETURN(return;); +} + +typedef struct { + duk_regconst_t reg_obj; + duk_regconst_t temp_start; + duk_small_uint_t num_pairs; + duk_small_uint_t num_total_pairs; +} duk__objlit_state; + +DUK_LOCAL void duk__objlit_flush_keys(duk_compiler_ctx *comp_ctx, duk__objlit_state *st) { + if (st->num_pairs > 0) { + /* - A is a source register (it's not a write target, but used + * to identify the target object) but can be shuffled. + * - B cannot be shuffled normally because it identifies a range + * of registers, the emitter has special handling for this + * (the "no shuffle" flag must not be set). + * - C is a non-register number and cannot be shuffled, but + * never needs to be. + */ + DUK_ASSERT(st->num_pairs > 0); + duk__emit_a_b_c(comp_ctx, + DUK_OP_MPUTOBJ | + DUK__EMIT_FLAG_NO_SHUFFLE_C | + DUK__EMIT_FLAG_A_IS_SOURCE, + st->reg_obj, + st->temp_start, + (duk_regconst_t) (st->num_pairs * 2)); + st->num_total_pairs += st->num_pairs; + st->num_pairs = 0; + } + DUK__SETTEMP(comp_ctx, st->temp_start); +} + +DUK_LOCAL duk_bool_t duk__objlit_load_key(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_token *tok, duk_regconst_t reg_temp) { + if (tok->t_nores == DUK_TOK_IDENTIFIER || tok->t_nores == DUK_TOK_STRING) { + /* same handling for identifiers and strings */ + DUK_ASSERT(tok->str1 != NULL); + duk_push_hstring(comp_ctx->thr, tok->str1); + } else if (tok->t == DUK_TOK_NUMBER) { + /* numbers can be loaded as numbers and coerced on the fly */ + duk_push_number(comp_ctx->thr, tok->num); + } else { + return 1; /* error */ + } + + duk__ivalue_plain_fromstack(comp_ctx, res); + DUK__SETTEMP(comp_ctx, reg_temp + 1); + duk__ivalue_toforcedreg(comp_ctx, res, reg_temp); + DUK__SETTEMP(comp_ctx, reg_temp + 1); + return 0; +} + +DUK_LOCAL void duk__nud_object_literal(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk__objlit_state st; + duk_regconst_t reg_temp; /* temp reg */ + duk_small_uint_t max_init_pairs; /* max # of key-value pairs initialized in one MPUTOBJ set */ + duk_bool_t first; /* first value: comma must not precede the value */ + duk_bool_t is_set, is_get; /* temps */ +#if !defined(DUK_USE_PREFER_SIZE) + duk_int_t pc_newobj; + duk_compiler_instr *instr; +#endif + + DUK_ASSERT(comp_ctx->prev_token.t == DUK_TOK_LCURLY); + + max_init_pairs = DUK__MAX_OBJECT_INIT_PAIRS; /* XXX: depend on available temps? */ + + st.reg_obj = DUK__ALLOCTEMP(comp_ctx); /* target object */ + st.temp_start = DUK__GETTEMP(comp_ctx); /* start of MPUTOBJ argument list */ + st.num_pairs = 0; /* number of key/value pairs emitted for current MPUTOBJ set */ + st.num_total_pairs = 0; /* number of key/value pairs emitted overall */ + +#if !defined(DUK_USE_PREFER_SIZE) + pc_newobj = duk__get_current_pc(comp_ctx); +#endif + duk__emit_bc(comp_ctx, DUK_OP_NEWOBJ, st.reg_obj); + + /* + * Emit initializers in sets of maximum max_init_pairs keys. + * Setter/getter is handled separately and terminates the + * current set of initializer values. Corner cases such as + * single value initializers do not have special handling now. + */ + + first = 1; + for (;;) { + /* + * ES5 and ES2015+ provide a lot of different PropertyDefinition + * formats, see http://www.ecma-international.org/ecma-262/6.0/#sec-object-initializer. + * + * PropertyName can be IdentifierName (includes reserved words), a string + * literal, or a number literal. Note that IdentifierName allows 'get' and + * 'set' too, so we need to look ahead to the next token to distinguish: + * + * { get : 1 } + * + * and + * + * { get foo() { return 1 } } + * { get get() { return 1 } } // 'get' as getter propertyname + * + * Finally, a trailing comma is allowed. + * + * Key name is coerced to string at compile time (and ends up as a + * a string constant) even for numeric keys (e.g. "{1:'foo'}"). + * These could be emitted using e.g. LDINT, but that seems hardly + * worth the effort and would increase code size. + */ + + DUK_DDD(DUK_DDDPRINT("object literal loop, curr_token->t = %ld", + (long) comp_ctx->curr_token.t)); + + if (comp_ctx->curr_token.t == DUK_TOK_RCURLY) { + break; + } + + if (first) { + first = 0; + } else { + if (comp_ctx->curr_token.t != DUK_TOK_COMMA) { + goto syntax_error; + } + duk__advance(comp_ctx); + if (comp_ctx->curr_token.t == DUK_TOK_RCURLY) { + /* trailing comma followed by rcurly */ + break; + } + } + + /* Advance to get one step of lookup. */ + duk__advance(comp_ctx); + + /* Flush current MPUTOBJ if enough many pairs gathered. */ + if (st.num_pairs >= max_init_pairs) { + duk__objlit_flush_keys(comp_ctx, &st); + DUK_ASSERT(st.num_pairs == 0); + } + + /* Reset temp register state and reserve reg_temp and + * reg_temp + 1 for handling the current property. + */ + DUK__SETTEMP(comp_ctx, st.temp_start + 2 * (duk_regconst_t) st.num_pairs); + reg_temp = DUK__ALLOCTEMPS(comp_ctx, 2); + + /* NOTE: "get" and "set" are not officially ReservedWords and the lexer + * currently treats them always like ordinary identifiers (DUK_TOK_GET + * and DUK_TOK_SET are unused). They need to be detected based on the + * identifier string content. + */ + + is_get = (comp_ctx->prev_token.t == DUK_TOK_IDENTIFIER && + comp_ctx->prev_token.str1 == DUK_HTHREAD_STRING_GET(thr)); + is_set = (comp_ctx->prev_token.t == DUK_TOK_IDENTIFIER && + comp_ctx->prev_token.str1 == DUK_HTHREAD_STRING_SET(thr)); + if ((is_get || is_set) && comp_ctx->curr_token.t != DUK_TOK_COLON) { + /* getter/setter */ + duk_int_t fnum; + + duk__objlit_flush_keys(comp_ctx, &st); + DUK_ASSERT(DUK__GETTEMP(comp_ctx) == st.temp_start); /* 2 regs are guaranteed to be allocated w.r.t. temp_max */ + reg_temp = DUK__ALLOCTEMPS(comp_ctx, 2); + + if (duk__objlit_load_key(comp_ctx, res, &comp_ctx->curr_token, reg_temp) != 0) { + goto syntax_error; + } + + /* curr_token = get/set name */ + fnum = duk__parse_func_like_fnum(comp_ctx, DUK__FUNC_FLAG_GETSET); + + duk__emit_a_bc(comp_ctx, + DUK_OP_CLOSURE, + st.temp_start + 1, + (duk_regconst_t) fnum); + + /* Slot C is used in a non-standard fashion (range of regs), + * emitter code has special handling for it (must not set the + * "no shuffle" flag). + */ + duk__emit_a_bc(comp_ctx, + (is_get ? DUK_OP_INITGET : DUK_OP_INITSET) | DUK__EMIT_FLAG_A_IS_SOURCE, + st.reg_obj, + st.temp_start); /* temp_start+0 = key, temp_start+1 = closure */ + + DUK_ASSERT(st.num_pairs == 0); /* temp state is reset on next loop */ +#if defined(DUK_USE_ES6) + } else if (comp_ctx->prev_token.t == DUK_TOK_IDENTIFIER && + (comp_ctx->curr_token.t == DUK_TOK_COMMA || comp_ctx->curr_token.t == DUK_TOK_RCURLY)) { + duk_bool_t load_rc; + + load_rc = duk__objlit_load_key(comp_ctx, res, &comp_ctx->prev_token, reg_temp); + DUK_UNREF(load_rc); + DUK_ASSERT(load_rc == 0); /* always succeeds because token is identifier */ + + duk__ivalue_var_hstring(comp_ctx, res, comp_ctx->prev_token.str1); + DUK_ASSERT(DUK__GETTEMP(comp_ctx) == reg_temp + 1); + duk__ivalue_toforcedreg(comp_ctx, res, reg_temp + 1); + + st.num_pairs++; + } else if ((comp_ctx->prev_token.t == DUK_TOK_IDENTIFIER || + comp_ctx->prev_token.t == DUK_TOK_STRING || + comp_ctx->prev_token.t == DUK_TOK_NUMBER) && + comp_ctx->curr_token.t == DUK_TOK_LPAREN) { + duk_int_t fnum; + + /* Parsing-wise there's a small hickup here: the token parsing + * state is one step too advanced for the function parse helper + * compared to other cases. The current solution is an extra + * flag to indicate whether function parsing should use the + * current or the previous token to starting parsing from. + */ + + if (duk__objlit_load_key(comp_ctx, res, &comp_ctx->prev_token, reg_temp) != 0) { + goto syntax_error; + } + + fnum = duk__parse_func_like_fnum(comp_ctx, DUK__FUNC_FLAG_USE_PREVTOKEN | DUK__FUNC_FLAG_METDEF); + + duk__emit_a_bc(comp_ctx, + DUK_OP_CLOSURE, + reg_temp + 1, + (duk_regconst_t) fnum); + + st.num_pairs++; +#endif /* DUK_USE_ES6 */ + } else { +#if defined(DUK_USE_ES6) + if (comp_ctx->prev_token.t == DUK_TOK_LBRACKET) { + /* ES2015 computed property name. Executor ToPropertyKey() + * coerces the key at runtime. + */ + DUK__SETTEMP(comp_ctx, reg_temp); + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_FOR_EXPR, reg_temp); + duk__advance_expect(comp_ctx, DUK_TOK_RBRACKET); + + /* XXX: If next token is '(' we're dealing with + * the method shorthand with a computed name, + * e.g. { [Symbol.for('foo')](a,b) {} }. This + * form is not yet supported and causes a + * SyntaxError on the DUK_TOK_COLON check below. + */ + } + else +#endif /* DUK_USE_ES6 */ + { + if (duk__objlit_load_key(comp_ctx, res, &comp_ctx->prev_token, reg_temp) != 0) { + goto syntax_error; + } + } + + duk__advance_expect(comp_ctx, DUK_TOK_COLON); + + DUK__SETTEMP(comp_ctx, reg_temp + 1); + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_COMMA /*rbp_flags*/, reg_temp + 1 /*forced_reg*/); + + st.num_pairs++; + } + } /* property loop */ + + /* Flush remaining properties. */ + duk__objlit_flush_keys(comp_ctx, &st); + DUK_ASSERT(st.num_pairs == 0); + DUK_ASSERT(DUK__GETTEMP(comp_ctx) == st.temp_start); + + /* Update initial size for NEWOBJ. The init size doesn't need to be + * exact as the purpose is just to avoid object resizes in common + * cases. The size is capped to field A limit, and will be too high + * if the object literal contains duplicate keys (this is harmless but + * increases memory traffic if the object is compacted later on). + */ +#if !defined(DUK_USE_PREFER_SIZE) + instr = duk__get_instr_ptr(comp_ctx, pc_newobj); + instr->ins |= DUK_ENC_OP_A(0, st.num_total_pairs > DUK_BC_A_MAX ? DUK_BC_A_MAX : st.num_total_pairs); +#endif + + DUK_ASSERT(comp_ctx->curr_token.t == DUK_TOK_RCURLY); + duk__advance(comp_ctx); /* No RegExp after object literal. */ + + duk__ivalue_regconst(res, st.reg_obj); + return; + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_OBJECT_LITERAL); + DUK_WO_NORETURN(return;); +} + +/* Parse argument list. Arguments are written to temps starting from + * "next temp". Returns number of arguments parsed. Expects left paren + * to be already eaten, and eats the right paren before returning. + */ +DUK_LOCAL duk_int_t duk__parse_arguments(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_int_t nargs = 0; + duk_regconst_t reg_temp; + + /* Note: expect that caller has already eaten the left paren */ + + DUK_DDD(DUK_DDDPRINT("start parsing arguments, prev_token.t=%ld, curr_token.t=%ld", + (long) comp_ctx->prev_token.t, (long) comp_ctx->curr_token.t)); + + for (;;) { + if (comp_ctx->curr_token.t == DUK_TOK_RPAREN) { + break; + } + if (nargs > 0) { + duk__advance_expect(comp_ctx, DUK_TOK_COMMA); + } + + /* We want the argument expression value to go to "next temp" + * without additional moves. That should almost always be the + * case, but we double check after expression parsing. + * + * This is not the cleanest possible approach. + */ + + reg_temp = DUK__ALLOCTEMP(comp_ctx); /* bump up "allocated" reg count, just in case */ + DUK__SETTEMP(comp_ctx, reg_temp); + + /* binding power must be high enough to NOT allow comma expressions directly */ + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_COMMA /*rbp_flags*/, reg_temp); /* always allow 'in', coerce to 'tr' just in case */ + + DUK__SETTEMP(comp_ctx, reg_temp + 1); + nargs++; + + DUK_DDD(DUK_DDDPRINT("argument #%ld written into reg %ld", (long) nargs, (long) reg_temp)); + } + + /* eat the right paren */ + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* RegExp mode does not matter. */ + + DUK_DDD(DUK_DDDPRINT("end parsing arguments")); + + return nargs; +} + +DUK_LOCAL duk_bool_t duk__expr_is_empty(duk_compiler_ctx *comp_ctx) { + /* empty expressions can be detected conveniently with nud/led counts */ + return (comp_ctx->curr_func.nud_count == 0) && + (comp_ctx->curr_func.led_count == 0); +} + +DUK_LOCAL void duk__expr_nud(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk_token *tk; + duk_regconst_t temp_at_entry; + duk_small_uint_t tok; + duk_uint32_t args; /* temp variable to pass constants and flags to shared code */ + + /* + * ctx->prev_token token to process with duk__expr_nud() + * ctx->curr_token updated by caller + * + * Note: the token in the switch below has already been eaten. + */ + + temp_at_entry = DUK__GETTEMP(comp_ctx); + + comp_ctx->curr_func.nud_count++; + + tk = &comp_ctx->prev_token; + tok = tk->t; + res->t = DUK_IVAL_NONE; + + DUK_DDD(DUK_DDDPRINT("duk__expr_nud(), prev_token.t=%ld, allow_in=%ld, paren_level=%ld", + (long) tk->t, (long) comp_ctx->curr_func.allow_in, (long) comp_ctx->curr_func.paren_level)); + + switch (tok) { + + /* PRIMARY EXPRESSIONS */ + + case DUK_TOK_THIS: { + duk_regconst_t reg_temp; + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__emit_bc(comp_ctx, + DUK_OP_LDTHIS, + reg_temp); + duk__ivalue_regconst(res, reg_temp); + return; + } + case DUK_TOK_IDENTIFIER: { + duk__ivalue_var_hstring(comp_ctx, res, tk->str1); + return; + } + case DUK_TOK_NULL: { + duk_push_null(thr); + goto plain_value; + } + case DUK_TOK_TRUE: { + duk_push_true(thr); + goto plain_value; + } + case DUK_TOK_FALSE: { + duk_push_false(thr); + goto plain_value; + } + case DUK_TOK_NUMBER: { + duk_push_number(thr, tk->num); + goto plain_value; + } + case DUK_TOK_STRING: { + DUK_ASSERT(tk->str1 != NULL); + duk_push_hstring(thr, tk->str1); + goto plain_value; + } + case DUK_TOK_REGEXP: { +#if defined(DUK_USE_REGEXP_SUPPORT) + duk_regconst_t reg_temp; + duk_regconst_t rc_re_bytecode; /* const */ + duk_regconst_t rc_re_source; /* const */ + + DUK_ASSERT(tk->str1 != NULL); + DUK_ASSERT(tk->str2 != NULL); + + DUK_DDD(DUK_DDDPRINT("emitting regexp op, str1=%!O, str2=%!O", + (duk_heaphdr *) tk->str1, + (duk_heaphdr *) tk->str2)); + + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk_push_hstring(thr, tk->str1); + duk_push_hstring(thr, tk->str2); + + /* [ ... pattern flags ] */ + + duk_regexp_compile(thr); + + /* [ ... escaped_source bytecode ] */ + + rc_re_bytecode = duk__getconst(comp_ctx); + rc_re_source = duk__getconst(comp_ctx); + + duk__emit_a_b_c(comp_ctx, + DUK_OP_REGEXP | DUK__EMIT_FLAG_BC_REGCONST, + reg_temp /*a*/, + rc_re_bytecode /*b*/, + rc_re_source /*c*/); + + duk__ivalue_regconst(res, reg_temp); + return; +#else /* DUK_USE_REGEXP_SUPPORT */ + goto syntax_error; +#endif /* DUK_USE_REGEXP_SUPPORT */ + } + case DUK_TOK_LBRACKET: { + DUK_DDD(DUK_DDDPRINT("parsing array literal")); + duk__nud_array_literal(comp_ctx, res); + return; + } + case DUK_TOK_LCURLY: { + DUK_DDD(DUK_DDDPRINT("parsing object literal")); + duk__nud_object_literal(comp_ctx, res); + return; + } + case DUK_TOK_LPAREN: { + duk_bool_t prev_allow_in; + + comp_ctx->curr_func.paren_level++; + prev_allow_in = comp_ctx->curr_func.allow_in; + comp_ctx->curr_func.allow_in = 1; /* reset 'allow_in' for parenthesized expression */ + + duk__expr(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); /* Expression, terminates at a ')' */ + + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* No RegExp after parenthesized expression. */ + comp_ctx->curr_func.allow_in = prev_allow_in; + comp_ctx->curr_func.paren_level--; + return; + } + + /* MEMBER/NEW/CALL EXPRESSIONS */ + + case DUK_TOK_NEW: { + /* + * Parsing an expression starting with 'new' is tricky because + * there are multiple possible productions deriving from + * LeftHandSideExpression which begin with 'new'. + * + * We currently resort to one-token lookahead to distinguish the + * cases. Hopefully this is correct. The binding power must be + * such that parsing ends at an LPAREN (CallExpression) but not at + * a PERIOD or LBRACKET (MemberExpression). + * + * See doc/compiler.rst for discussion on the parsing approach, + * and testcases/test-dev-new.js for a bunch of documented tests. + */ + + duk_regconst_t reg_target; + duk_int_t nargs; + + DUK_DDD(DUK_DDDPRINT("begin parsing new expression")); + + reg_target = DUK__ALLOCTEMPS(comp_ctx, 2); + +#if defined(DUK_USE_ES6) + if (comp_ctx->curr_token.t == DUK_TOK_PERIOD) { + /* new.target */ + DUK_DDD(DUK_DDDPRINT("new.target")); + duk__advance(comp_ctx); + if (comp_ctx->curr_token.t_nores != DUK_TOK_IDENTIFIER || + !duk_hstring_equals_ascii_cstring(comp_ctx->curr_token.str1, "target")) { + goto syntax_error_newtarget; + } + if (comp_ctx->curr_func.is_global) { + goto syntax_error_newtarget; + } + duk__advance(comp_ctx); + duk__emit_bc(comp_ctx, + DUK_OP_NEWTARGET, + reg_target); + duk__ivalue_regconst(res, reg_target); + return; + } +#endif /* DUK_USE_ES6 */ + + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_CALL /*rbp_flags*/, reg_target /*forced_reg*/); + duk__emit_bc(comp_ctx, DUK_OP_NEWOBJ, reg_target + 1); /* default instance */ + DUK__SETTEMP(comp_ctx, reg_target + 2); + + /* XXX: 'new obj.noSuch()' doesn't use GETPROPC now which + * makes the error message worse than for obj.noSuch(). + */ + + if (comp_ctx->curr_token.t == DUK_TOK_LPAREN) { + /* 'new' MemberExpression Arguments */ + DUK_DDD(DUK_DDDPRINT("new expression has argument list")); + duk__advance(comp_ctx); + nargs = duk__parse_arguments(comp_ctx, res); /* parse args starting from "next temp", reg_target + 1 */ + /* right paren eaten */ + } else { + /* 'new' MemberExpression */ + DUK_DDD(DUK_DDDPRINT("new expression has no argument list")); + nargs = 0; + } + + duk__emit_a_bc(comp_ctx, + DUK_OP_CALL0 | DUK_BC_CALL_FLAG_CONSTRUCT, + nargs /*num_args*/, + reg_target /*target*/); + + DUK_DDD(DUK_DDDPRINT("end parsing new expression")); + + duk__ivalue_regconst(res, reg_target); + return; + } + + /* FUNCTION EXPRESSIONS */ + + case DUK_TOK_FUNCTION: { + /* Function expression. Note that any statement beginning with 'function' + * is handled by the statement parser as a function declaration, or a + * non-standard function expression/statement (or a SyntaxError). We only + * handle actual function expressions (occurring inside an expression) here. + * + * O(depth^2) parse count for inner functions is handled by recording a + * lexer offset on the first compilation pass, so that the function can + * be efficiently skipped on the second pass. This is encapsulated into + * duk__parse_func_like_fnum(). + */ + + duk_regconst_t reg_temp; + duk_int_t fnum; + + reg_temp = DUK__ALLOCTEMP(comp_ctx); + + /* curr_token follows 'function' */ + fnum = duk__parse_func_like_fnum(comp_ctx, 0 /*flags*/); + DUK_DDD(DUK_DDDPRINT("parsed inner function -> fnum %ld", (long) fnum)); + + duk__emit_a_bc(comp_ctx, + DUK_OP_CLOSURE, + reg_temp /*a*/, + (duk_regconst_t) fnum /*bc*/); + + duk__ivalue_regconst(res, reg_temp); + return; + } + + /* UNARY EXPRESSIONS */ + + case DUK_TOK_DELETE: { + /* Delete semantics are a bit tricky. The description in E5 specification + * is kind of confusing, because it distinguishes between resolvability of + * a reference (which is only known at runtime) seemingly at compile time + * (= SyntaxError throwing). + */ + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + if (res->t == DUK_IVAL_VAR) { + /* not allowed in strict mode, regardless of whether resolves; + * in non-strict mode DELVAR handles both non-resolving and + * resolving cases (the specification description is a bit confusing). + */ + + duk_regconst_t reg_temp; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + if (comp_ctx->curr_func.is_strict) { + DUK_ERROR_SYNTAX(thr, DUK_STR_CANNOT_DELETE_IDENTIFIER); + DUK_WO_NORETURN(return;); + } + + DUK__SETTEMP(comp_ctx, temp_at_entry); + reg_temp = DUK__ALLOCTEMP(comp_ctx); + + duk_dup(thr, res->x1.valstack_idx); + if (duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + /* register bound variables are non-configurable -> always false */ + duk__emit_bc(comp_ctx, + DUK_OP_LDFALSE, + reg_temp); + } else { + duk_dup(thr, res->x1.valstack_idx); + rc_varname = duk__getconst(comp_ctx); + duk__emit_a_bc(comp_ctx, + DUK_OP_DELVAR, + reg_temp, + rc_varname); + } + duk__ivalue_regconst(res, reg_temp); + } else if (res->t == DUK_IVAL_PROP) { + duk_regconst_t reg_temp; + duk_regconst_t reg_obj; + duk_regconst_t rc_key; + + DUK__SETTEMP(comp_ctx, temp_at_entry); + reg_temp = DUK__ALLOCTEMP(comp_ctx); + reg_obj = duk__ispec_toregconst_raw(comp_ctx, &res->x1, -1 /*forced_reg*/, 0 /*flags*/); /* don't allow const */ + rc_key = duk__ispec_toregconst_raw(comp_ctx, &res->x2, -1 /*forced_reg*/, DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); + duk__emit_a_b_c(comp_ctx, + DUK_OP_DELPROP | DUK__EMIT_FLAG_BC_REGCONST, + reg_temp, + reg_obj, + rc_key); + + duk__ivalue_regconst(res, reg_temp); + } else { + /* non-Reference deletion is always 'true', even in strict mode */ + duk_push_true(thr); + goto plain_value; + } + return; + } + case DUK_TOK_VOID: { + duk__expr_toplain_ignore(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + duk_push_undefined(thr); + goto plain_value; + } + case DUK_TOK_TYPEOF: { + /* 'typeof' must handle unresolvable references without throwing + * a ReferenceError (E5 Section 11.4.3). Register mapped values + * will never be unresolvable so special handling is only required + * when an identifier is a "slow path" one. + */ + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + + if (res->t == DUK_IVAL_VAR) { + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + duk_regconst_t reg_temp; + + duk_dup(thr, res->x1.valstack_idx); + if (!duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + DUK_DDD(DUK_DDDPRINT("typeof for an identifier name which could not be resolved " + "at compile time, need to use special run-time handling")); + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__emit_a_bc(comp_ctx, + DUK_OP_TYPEOFID, + reg_temp, + rc_varname); + duk__ivalue_regconst(res, reg_temp); + return; + } + } + + args = DUK_OP_TYPEOF; + goto unary; + } + case DUK_TOK_INCREMENT: { + args = (DUK_OP_PREINCP << 8) + DUK_OP_PREINCR; + goto preincdec; + } + case DUK_TOK_DECREMENT: { + args = (DUK_OP_PREDECP << 8) + DUK_OP_PREDECR; + goto preincdec; + } + case DUK_TOK_ADD: { + /* unary plus */ + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + if (res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_VALUE && + duk_is_number(thr, res->x1.valstack_idx)) { + /* unary plus of a number is identity */ + return; + } + args = DUK_OP_UNP; + goto unary; + } + case DUK_TOK_SUB: { + /* unary minus */ + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + if (res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_VALUE && + duk_is_number(thr, res->x1.valstack_idx)) { + /* this optimization is important to handle negative literals + * (which are not directly provided by the lexical grammar) + */ + duk_tval *tv_num; + duk_double_union du; + + tv_num = DUK_GET_TVAL_POSIDX(thr, res->x1.valstack_idx); + DUK_ASSERT(tv_num != NULL); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_num)); + du.d = DUK_TVAL_GET_NUMBER(tv_num); + du.d = -du.d; + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + DUK_TVAL_SET_NUMBER(tv_num, du.d); + return; + } + args = DUK_OP_UNM; + goto unary; + } + case DUK_TOK_BNOT: { + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + args = DUK_OP_BNOT; + goto unary; + } + case DUK_TOK_LNOT: { + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + if (res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_VALUE) { + /* Very minimal inlining to handle common idioms '!0' and '!1', + * and also boolean arguments like '!false' and '!true'. + */ + duk_tval *tv_val; + + tv_val = DUK_GET_TVAL_POSIDX(thr, res->x1.valstack_idx); + DUK_ASSERT(tv_val != NULL); + if (DUK_TVAL_IS_NUMBER(tv_val)) { + duk_double_t d; + d = DUK_TVAL_GET_NUMBER(tv_val); + if (d == 0.0) { + /* Matches both +0 and -0 on purpose. */ + DUK_DDD(DUK_DDDPRINT("inlined lnot: !0 -> true")); + DUK_TVAL_SET_BOOLEAN_TRUE(tv_val); + return; + } else if (d == 1.0) { + DUK_DDD(DUK_DDDPRINT("inlined lnot: !1 -> false")); + DUK_TVAL_SET_BOOLEAN_FALSE(tv_val); + return; + } + } else if (DUK_TVAL_IS_BOOLEAN(tv_val)) { + duk_small_uint_t v; + v = DUK_TVAL_GET_BOOLEAN(tv_val); + DUK_DDD(DUK_DDDPRINT("inlined lnot boolean: %ld", (long) v)); + DUK_ASSERT(v == 0 || v == 1); + DUK_TVAL_SET_BOOLEAN(tv_val, v ^ 0x01); + return; + } + } + args = DUK_OP_LNOT; + goto unary; + } + + } /* end switch */ + + DUK_ERROR_SYNTAX(thr, DUK_STR_PARSE_ERROR); + DUK_WO_NORETURN(return;); + + unary: + { + /* Unary opcodes use just the 'BC' register source because it + * matches current shuffle limits, and maps cleanly to 16 high + * bits of the opcode. + */ + + duk_regconst_t reg_src, reg_res; + + reg_src = duk__ivalue_toregconst_raw(comp_ctx, res, -1 /*forced_reg*/, 0 /*flags*/); + if (DUK__ISREG_TEMP(comp_ctx, reg_src)) { + reg_res = reg_src; + } else { + reg_res = DUK__ALLOCTEMP(comp_ctx); + } + duk__emit_a_bc(comp_ctx, + args, + reg_res, + reg_src); + duk__ivalue_regconst(res, reg_res); + return; + } + + preincdec: + { + /* preincrement and predecrement */ + duk_regconst_t reg_res; + duk_small_uint_t args_op1 = args & 0xff; /* DUK_OP_PREINCR/DUK_OP_PREDECR */ + duk_small_uint_t args_op2 = args >> 8; /* DUK_OP_PREINCP_RR/DUK_OP_PREDECP_RR */ + + /* Specific assumptions for opcode numbering. */ + DUK_ASSERT(DUK_OP_PREINCR + 4 == DUK_OP_PREINCV); + DUK_ASSERT(DUK_OP_PREDECR + 4 == DUK_OP_PREDECV); + + reg_res = DUK__ALLOCTEMP(comp_ctx); + + duk__expr(comp_ctx, res, DUK__BP_MULTIPLICATIVE /*rbp_flags*/); /* UnaryExpression */ + if (res->t == DUK_IVAL_VAR) { + duk_hstring *h_varname; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + h_varname = duk_known_hstring(thr, res->x1.valstack_idx); + + if (duk__hstring_is_eval_or_arguments_in_strict_mode(comp_ctx, h_varname)) { + goto syntax_error; + } + + duk_dup(thr, res->x1.valstack_idx); + if (duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + duk__emit_a_bc(comp_ctx, + args_op1, /* e.g. DUK_OP_PREINCR */ + reg_res, + reg_varbind); + } else { + duk__emit_a_bc(comp_ctx, + args_op1 + 4, /* e.g. DUK_OP_PREINCV */ + reg_res, + rc_varname); + } + + DUK_DDD(DUK_DDDPRINT("preincdec to '%!O' -> reg_varbind=%ld, rc_varname=%ld", + (duk_heaphdr *) h_varname, (long) reg_varbind, (long) rc_varname)); + } else if (res->t == DUK_IVAL_PROP) { + duk_regconst_t reg_obj; /* allocate to reg only (not const) */ + duk_regconst_t rc_key; + reg_obj = duk__ispec_toregconst_raw(comp_ctx, &res->x1, -1 /*forced_reg*/, 0 /*flags*/); /* don't allow const */ + rc_key = duk__ispec_toregconst_raw(comp_ctx, &res->x2, -1 /*forced_reg*/, DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); + duk__emit_a_b_c(comp_ctx, + args_op2 | DUK__EMIT_FLAG_BC_REGCONST, /* e.g. DUK_OP_PREINCP */ + reg_res, + reg_obj, + rc_key); + } else { + /* Technically return value is not needed because INVLHS will + * unconditially throw a ReferenceError. Coercion is necessary + * for proper semantics (consider ToNumber() called for an object). + * Use DUK_OP_UNP with a dummy register to get ToNumber(). + */ + + duk__ivalue_toforcedreg(comp_ctx, res, reg_res); + duk__emit_bc(comp_ctx, + DUK_OP_UNP, + reg_res); /* for side effects, result ignored */ + duk__emit_op_only(comp_ctx, + DUK_OP_INVLHS); + } + DUK__SETTEMP(comp_ctx, reg_res + 1); + duk__ivalue_regconst(res, reg_res); + return; + } + + plain_value: + { + /* Stack top contains plain value */ + duk__ivalue_plain_fromstack(comp_ctx, res); + return; + } + +#if defined(DUK_USE_ES6) + syntax_error_newtarget: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_NEWTARGET); + DUK_WO_NORETURN(return;); +#endif + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_EXPRESSION); + DUK_WO_NORETURN(return;); +} + +/* XXX: add flag to indicate whether caller cares about return value; this + * affects e.g. handling of assignment expressions. This change needs API + * changes elsewhere too. + */ +DUK_LOCAL void duk__expr_led(duk_compiler_ctx *comp_ctx, duk_ivalue *left, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk_token *tk; + duk_small_uint_t tok; + duk_uint32_t args; /* temp variable to pass constants and flags to shared code */ + + /* + * ctx->prev_token token to process with duk__expr_led() + * ctx->curr_token updated by caller + */ + + comp_ctx->curr_func.led_count++; + + /* The token in the switch has already been eaten here */ + tk = &comp_ctx->prev_token; + tok = tk->t; + + DUK_DDD(DUK_DDDPRINT("duk__expr_led(), prev_token.t=%ld, allow_in=%ld, paren_level=%ld", + (long) tk->t, (long) comp_ctx->curr_func.allow_in, (long) comp_ctx->curr_func.paren_level)); + + /* XXX: default priority for infix operators is duk__expr_lbp(tok) -> get it here? */ + + switch (tok) { + + /* PRIMARY EXPRESSIONS */ + + case DUK_TOK_PERIOD: { + /* Property access expressions are critical for correct LHS ordering, + * see comments in duk__expr()! + * + * A conservative approach would be to use duk__ivalue_totempconst() + * for 'left'. However, allowing a reg-bound variable seems safe here + * and is nice because "foo.bar" is a common expression. If the ivalue + * is used in an expression a GETPROP will occur before any changes to + * the base value can occur. If the ivalue is used as an assignment + * LHS, the assignment code will ensure the base value is safe from + * RHS mutation. + */ + + /* XXX: This now coerces an identifier into a GETVAR to a temp, which + * causes an extra LDREG in call setup. It's sufficient to coerce to a + * unary ivalue? + */ + duk__ivalue_toplain(comp_ctx, left); + + /* NB: must accept reserved words as property name */ + if (comp_ctx->curr_token.t_nores != DUK_TOK_IDENTIFIER) { + DUK_ERROR_SYNTAX(thr, DUK_STR_EXPECTED_IDENTIFIER); + DUK_WO_NORETURN(return;); + } + + res->t = DUK_IVAL_PROP; + duk__copy_ispec(comp_ctx, &left->x1, &res->x1); /* left.x1 -> res.x1 */ + DUK_ASSERT(comp_ctx->curr_token.str1 != NULL); + duk_push_hstring(thr, comp_ctx->curr_token.str1); + duk_replace(thr, res->x2.valstack_idx); + res->x2.t = DUK_ISPEC_VALUE; + + /* special RegExp literal handling after IdentifierName */ + comp_ctx->curr_func.reject_regexp_in_adv = 1; + + duk__advance(comp_ctx); + return; + } + case DUK_TOK_LBRACKET: { + /* Property access expressions are critical for correct LHS ordering, + * see comments in duk__expr()! + */ + + /* XXX: optimize temp reg use */ + /* XXX: similar coercion issue as in DUK_TOK_PERIOD */ + /* XXX: coerce to regs? it might be better for enumeration use, where the + * same PROP ivalue is used multiple times. Or perhaps coerce PROP further + * there? + */ + /* XXX: for simple cases like x['y'] an unnecessary LDREG is + * emitted for the base value; could avoid it if we knew that + * the key expression is safe (e.g. just a single literal). + */ + + /* The 'left' value must not be a register bound variable + * because it may be mutated during the rest of the expression + * and E5.1 Section 11.2.1 specifies the order of evaluation + * so that the base value is evaluated first. + * See: test-bug-nested-prop-mutate.js. + */ + duk__ivalue_totempconst(comp_ctx, left); + duk__expr_toplain(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); /* Expression, ']' terminates */ + duk__advance_expect(comp_ctx, DUK_TOK_RBRACKET); + + res->t = DUK_IVAL_PROP; + duk__copy_ispec(comp_ctx, &res->x1, &res->x2); /* res.x1 -> res.x2 */ + duk__copy_ispec(comp_ctx, &left->x1, &res->x1); /* left.x1 -> res.x1 */ + return; + } + case DUK_TOK_LPAREN: { + /* function call */ + duk_regconst_t reg_cs = DUK__ALLOCTEMPS(comp_ctx, 2); + duk_int_t nargs; + duk_small_uint_t call_op = DUK_OP_CALL0; + + /* XXX: attempt to get the call result to "next temp" whenever + * possible to avoid unnecessary register shuffles. + */ + + /* + * Setup call: target and 'this' binding. Three cases: + * + * 1. Identifier base (e.g. "foo()") + * 2. Property base (e.g. "foo.bar()") + * 3. Register base (e.g. "foo()()"; i.e. when a return value is a function) + */ + + if (left->t == DUK_IVAL_VAR) { + duk_hstring *h_varname; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + DUK_DDD(DUK_DDDPRINT("function call with identifier base")); + + h_varname = duk_known_hstring(thr, left->x1.valstack_idx); + if (h_varname == DUK_HTHREAD_STRING_EVAL(thr)) { + /* Potential direct eval call detected, flag the CALL + * so that a run-time "direct eval" check is made and + * special behavior may be triggered. Note that this + * does not prevent 'eval' from being register bound. + */ + DUK_DDD(DUK_DDDPRINT("function call with identifier 'eval' " + "-> using EVALCALL, marking function " + "as may_direct_eval")); + call_op |= DUK_BC_CALL_FLAG_CALLED_AS_EVAL; + comp_ctx->curr_func.may_direct_eval = 1; + } + + duk_dup(thr, left->x1.valstack_idx); + if (duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + duk__emit_a_bc(comp_ctx, + DUK_OP_CSREG | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_varbind, + reg_cs + 0); + } else { + /* XXX: expand target register or constant field to + * reduce shuffling. + */ + DUK_ASSERT(DUK__ISCONST(rc_varname)); + duk__emit_a_b(comp_ctx, + DUK_OP_CSVAR | DUK__EMIT_FLAG_BC_REGCONST, + reg_cs + 0, + rc_varname); + } + } else if (left->t == DUK_IVAL_PROP) { + /* Call through a property lookup, E5 Section 11.2.3, step 6.a.i, + * E5 Section 10.4.3. There used to be a separate CSPROP opcode + * but a typical call setup took 3 opcodes (e.g. LDREG, LDCONST, + * CSPROP) and the same can be achieved with ordinary loads. + */ +#if defined(DUK_USE_VERBOSE_ERRORS) + duk_regconst_t reg_key; +#endif + + DUK_DDD(DUK_DDDPRINT("function call with property base")); + + /* XXX: For Math.sin() this generates: LDCONST + LDREG + + * GETPROPC + call. The LDREG is unnecessary because LDCONST + * could be loaded directly into reg_cs + 1. This doesn't + * happen now because a variable cannot be in left->x1 of a + * DUK_IVAL_PROP. We could notice that left->x1 is a temp + * and reuse, but it would still be in the wrong position + * (reg_cs + 0 rather than reg_cs + 1). + */ + duk__ispec_toforcedreg(comp_ctx, &left->x1, reg_cs + 1); /* base */ +#if defined(DUK_USE_VERBOSE_ERRORS) + reg_key = duk__ispec_toregconst_raw(comp_ctx, &left->x2, -1, DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); + duk__emit_a_b_c(comp_ctx, + DUK_OP_GETPROPC | DUK__EMIT_FLAG_BC_REGCONST, + reg_cs + 0, + reg_cs + 1, + reg_key); +#else + duk__ivalue_toforcedreg(comp_ctx, left, reg_cs + 0); /* base[key] */ +#endif + } else { + DUK_DDD(DUK_DDDPRINT("function call with register base")); + + duk__ivalue_toforcedreg(comp_ctx, left, reg_cs + 0); +#if 0 + duk__emit_a_bc(comp_ctx, + DUK_OP_CSREG | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_cs + 0, + reg_cs + 0); /* in-place setup */ +#endif + /* Because of in-place setup, REGCS is equivalent to + * just this LDUNDEF. + */ + duk__emit_bc(comp_ctx, DUK_OP_LDUNDEF, reg_cs + 1); + } + + DUK__SETTEMP(comp_ctx, reg_cs + 2); + nargs = duk__parse_arguments(comp_ctx, res); /* parse args starting from "next temp" */ + + /* Tailcalls are handled by back-patching the already emitted opcode + * later in return statement parser. + */ + + duk__emit_a_bc(comp_ctx, + call_op, + (duk_regconst_t) nargs /*numargs*/, + reg_cs /*basereg*/); + DUK__SETTEMP(comp_ctx, reg_cs + 1); /* result in csreg */ + + duk__ivalue_regconst(res, reg_cs); + return; + } + + /* POSTFIX EXPRESSION */ + + case DUK_TOK_INCREMENT: { + args = (DUK_OP_POSTINCP_RR << 16) + (DUK_OP_POSTINCR << 8) + 0; + goto postincdec; + } + case DUK_TOK_DECREMENT: { + args = (DUK_OP_POSTDECP_RR << 16) + (DUK_OP_POSTDECR << 8) + 0; + goto postincdec; + } + + /* EXPONENTIATION EXPRESSION */ + +#if defined(DUK_USE_ES7_EXP_OPERATOR) + case DUK_TOK_EXP: { + args = (DUK_OP_EXP << 8) + DUK__BP_EXPONENTIATION - 1; /* UnaryExpression */ + goto binary; + } +#endif + + /* MULTIPLICATIVE EXPRESSION */ + + case DUK_TOK_MUL: { + args = (DUK_OP_MUL << 8) + DUK__BP_MULTIPLICATIVE; /* ExponentiationExpression */ + goto binary; + } + case DUK_TOK_DIV: { + args = (DUK_OP_DIV << 8) + DUK__BP_MULTIPLICATIVE; /* ExponentiationExpression */ + goto binary; + } + case DUK_TOK_MOD: { + args = (DUK_OP_MOD << 8) + DUK__BP_MULTIPLICATIVE; /* ExponentiationExpression */ + goto binary; + } + + /* ADDITIVE EXPRESSION */ + + case DUK_TOK_ADD: { + args = (DUK_OP_ADD << 8) + DUK__BP_ADDITIVE; /* MultiplicativeExpression */ + goto binary; + } + case DUK_TOK_SUB: { + args = (DUK_OP_SUB << 8) + DUK__BP_ADDITIVE; /* MultiplicativeExpression */ + goto binary; + } + + /* SHIFT EXPRESSION */ + + case DUK_TOK_ALSHIFT: { + /* << */ + args = (DUK_OP_BASL << 8) + DUK__BP_SHIFT; + goto binary; + } + case DUK_TOK_ARSHIFT: { + /* >> */ + args = (DUK_OP_BASR << 8) + DUK__BP_SHIFT; + goto binary; + } + case DUK_TOK_RSHIFT: { + /* >>> */ + args = (DUK_OP_BLSR << 8) + DUK__BP_SHIFT; + goto binary; + } + + /* RELATIONAL EXPRESSION */ + + case DUK_TOK_LT: { + /* < */ + args = (DUK_OP_LT << 8) + DUK__BP_RELATIONAL; + goto binary; + } + case DUK_TOK_GT: { + args = (DUK_OP_GT << 8) + DUK__BP_RELATIONAL; + goto binary; + } + case DUK_TOK_LE: { + args = (DUK_OP_LE << 8) + DUK__BP_RELATIONAL; + goto binary; + } + case DUK_TOK_GE: { + args = (DUK_OP_GE << 8) + DUK__BP_RELATIONAL; + goto binary; + } + case DUK_TOK_INSTANCEOF: { + args = (DUK_OP_INSTOF << 8) + DUK__BP_RELATIONAL; + goto binary; + } + case DUK_TOK_IN: { + args = (DUK_OP_IN << 8) + DUK__BP_RELATIONAL; + goto binary; + } + + /* EQUALITY EXPRESSION */ + + case DUK_TOK_EQ: { + args = (DUK_OP_EQ << 8) + DUK__BP_EQUALITY; + goto binary; + } + case DUK_TOK_NEQ: { + args = (DUK_OP_NEQ << 8) + DUK__BP_EQUALITY; + goto binary; + } + case DUK_TOK_SEQ: { + args = (DUK_OP_SEQ << 8) + DUK__BP_EQUALITY; + goto binary; + } + case DUK_TOK_SNEQ: { + args = (DUK_OP_SNEQ << 8) + DUK__BP_EQUALITY; + goto binary; + } + + /* BITWISE EXPRESSIONS */ + + case DUK_TOK_BAND: { + args = (DUK_OP_BAND << 8) + DUK__BP_BAND; + goto binary; + } + case DUK_TOK_BXOR: { + args = (DUK_OP_BXOR << 8) + DUK__BP_BXOR; + goto binary; + } + case DUK_TOK_BOR: { + args = (DUK_OP_BOR << 8) + DUK__BP_BOR; + goto binary; + } + + /* LOGICAL EXPRESSIONS */ + + case DUK_TOK_LAND: { + /* syntactically left-associative but parsed as right-associative */ + args = (1 << 8) + DUK__BP_LAND - 1; + goto binary_logical; + } + case DUK_TOK_LOR: { + /* syntactically left-associative but parsed as right-associative */ + args = (0 << 8) + DUK__BP_LOR - 1; + goto binary_logical; + } + + /* CONDITIONAL EXPRESSION */ + + case DUK_TOK_QUESTION: { + /* XXX: common reg allocation need is to reuse a sub-expression's temp reg, + * but only if it really is a temp. Nothing fancy here now. + */ + duk_regconst_t reg_temp; + duk_int_t pc_jump1; + duk_int_t pc_jump2; + + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__ivalue_toforcedreg(comp_ctx, left, reg_temp); + duk__emit_if_true_skip(comp_ctx, reg_temp); + pc_jump1 = duk__emit_jump_empty(comp_ctx); /* jump to false */ + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_COMMA /*rbp_flags*/, reg_temp /*forced_reg*/); /* AssignmentExpression */ + duk__advance_expect(comp_ctx, DUK_TOK_COLON); + pc_jump2 = duk__emit_jump_empty(comp_ctx); /* jump to end */ + duk__patch_jump_here(comp_ctx, pc_jump1); + duk__expr_toforcedreg(comp_ctx, res, DUK__BP_COMMA /*rbp_flags*/, reg_temp /*forced_reg*/); /* AssignmentExpression */ + duk__patch_jump_here(comp_ctx, pc_jump2); + + DUK__SETTEMP(comp_ctx, reg_temp + 1); + duk__ivalue_regconst(res, reg_temp); + return; + } + + /* ASSIGNMENT EXPRESSION */ + + case DUK_TOK_EQUALSIGN: { + /* + * Assignments are right associative, allows e.g. + * a = 5; + * a += b = 9; // same as a += (b = 9) + * -> expression value 14, a = 14, b = 9 + * + * Right associativiness is reflected in the BP for recursion, + * "-1" ensures assignment operations are allowed. + * + * XXX: just use DUK__BP_COMMA (i.e. no need for 2-step bp levels)? + */ + args = (DUK_OP_NONE << 8) + DUK__BP_ASSIGNMENT - 1; /* DUK_OP_NONE marks a 'plain' assignment */ + goto assign; + } + case DUK_TOK_ADD_EQ: { + /* right associative */ + args = (DUK_OP_ADD << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_SUB_EQ: { + /* right associative */ + args = (DUK_OP_SUB << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_MUL_EQ: { + /* right associative */ + args = (DUK_OP_MUL << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_DIV_EQ: { + /* right associative */ + args = (DUK_OP_DIV << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_MOD_EQ: { + /* right associative */ + args = (DUK_OP_MOD << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } +#if defined(DUK_USE_ES7_EXP_OPERATOR) + case DUK_TOK_EXP_EQ: { + /* right associative */ + args = (DUK_OP_EXP << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } +#endif + case DUK_TOK_ALSHIFT_EQ: { + /* right associative */ + args = (DUK_OP_BASL << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_ARSHIFT_EQ: { + /* right associative */ + args = (DUK_OP_BASR << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_RSHIFT_EQ: { + /* right associative */ + args = (DUK_OP_BLSR << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_BAND_EQ: { + /* right associative */ + args = (DUK_OP_BAND << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_BOR_EQ: { + /* right associative */ + args = (DUK_OP_BOR << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + case DUK_TOK_BXOR_EQ: { + /* right associative */ + args = (DUK_OP_BXOR << 8) + DUK__BP_ASSIGNMENT - 1; + goto assign; + } + + /* COMMA */ + + case DUK_TOK_COMMA: { + /* right associative */ + + duk__ivalue_toplain_ignore(comp_ctx, left); /* need side effects, not value */ + duk__expr_toplain(comp_ctx, res, DUK__BP_COMMA - 1 /*rbp_flags*/); + + /* return 'res' (of right part) as our result */ + return; + } + + default: { + break; + } + } + + DUK_D(DUK_DPRINT("parse error: unexpected token: %ld", (long) tok)); + DUK_ERROR_SYNTAX(thr, DUK_STR_PARSE_ERROR); + DUK_WO_NORETURN(return;); + +#if 0 + /* XXX: shared handling for 'duk__expr_lhs'? */ + if (comp_ctx->curr_func.paren_level == 0 && XXX) { + comp_ctx->curr_func.duk__expr_lhs = 0; + } +#endif + + binary: + /* + * Shared handling of binary operations + * + * args = (opcode << 8) + rbp + */ + { + duk__ivalue_toplain(comp_ctx, left); + duk__expr_toplain(comp_ctx, res, args & 0xff /*rbp_flags*/); + + /* combine left->x1 and res->x1 (right->x1, really) -> (left->x1 OP res->x1) */ + DUK_ASSERT(left->t == DUK_IVAL_PLAIN); + DUK_ASSERT(res->t == DUK_IVAL_PLAIN); + + res->t = DUK_IVAL_ARITH; + res->op = (args >> 8) & 0xff; + + res->x2.t = res->x1.t; + res->x2.regconst = res->x1.regconst; + duk_copy(thr, res->x1.valstack_idx, res->x2.valstack_idx); + + res->x1.t = left->x1.t; + res->x1.regconst = left->x1.regconst; + duk_copy(thr, left->x1.valstack_idx, res->x1.valstack_idx); + + DUK_DDD(DUK_DDDPRINT("binary op, res: t=%ld, x1.t=%ld, x1.regconst=0x%08lx, x2.t=%ld, x2.regconst=0x%08lx", + (long) res->t, (long) res->x1.t, (unsigned long) res->x1.regconst, (long) res->x2.t, (unsigned long) res->x2.regconst)); + return; + } + + binary_logical: + /* + * Shared handling for logical AND and logical OR. + * + * args = (truthval << 8) + rbp + * + * Truthval determines when to skip right-hand-side. + * For logical AND truthval=1, for logical OR truthval=0. + * + * See doc/compiler.rst for discussion on compiling logical + * AND and OR expressions. The approach here is very simplistic, + * generating extra jumps and multiple evaluations of truth values, + * but generates code on-the-fly with only local back-patching. + * + * Both logical AND and OR are syntactically left-associated. + * However, logical ANDs are compiled as right associative + * expressions, i.e. "A && B && C" as "A && (B && C)", to allow + * skip jumps to skip over the entire tail. Similarly for logical OR. + */ + + { + duk_regconst_t reg_temp; + duk_int_t pc_jump; + duk_small_uint_t args_truthval = args >> 8; + duk_small_uint_t args_rbp = args & 0xff; + + /* XXX: unoptimal use of temps, resetting */ + + reg_temp = DUK__ALLOCTEMP(comp_ctx); + + duk__ivalue_toforcedreg(comp_ctx, left, reg_temp); + DUK_ASSERT(DUK__ISREG(reg_temp)); + duk__emit_bc(comp_ctx, + (args_truthval ? DUK_OP_IFTRUE_R : DUK_OP_IFFALSE_R), + reg_temp); /* skip jump conditionally */ + pc_jump = duk__emit_jump_empty(comp_ctx); + duk__expr_toforcedreg(comp_ctx, res, args_rbp /*rbp_flags*/, reg_temp /*forced_reg*/); + duk__patch_jump_here(comp_ctx, pc_jump); + + duk__ivalue_regconst(res, reg_temp); + return; + } + + assign: + /* + * Shared assignment expression handling + * + * args = (opcode << 8) + rbp + * + * If 'opcode' is DUK_OP_NONE, plain assignment without arithmetic. + * Syntactically valid left-hand-side forms which are not accepted as + * left-hand-side values (e.g. as in "f() = 1") must NOT cause a + * SyntaxError, but rather a run-time ReferenceError. + * + * When evaluating X <op>= Y, the LHS (X) is conceptually evaluated + * to a temporary first. The RHS is then evaluated. Finally, the + * <op> is applied to the initial value of RHS (not the value after + * RHS evaluation), and written to X. Doing so concretely generates + * inefficient code so we'd like to avoid the temporary when possible. + * See: https://github.com/svaarala/duktape/pull/992. + * + * The expression value (final LHS value, written to RHS) is + * conceptually copied into a fresh temporary so that it won't + * change even if the LHS/RHS values change in outer expressions. + * For example, it'd be generally incorrect for the expression value + * to be the RHS register binding, unless there's a guarantee that it + * won't change during further expression evaluation. Using the + * temporary concretely produces inefficient bytecode, so we try to + * avoid the extra temporary for some known-to-be-safe cases. + * Currently the only safe case we detect is a "top level assignment", + * for example "x = y + z;", where the assignment expression value is + * ignored. + * See: test-dev-assign-expr.js and test-bug-assign-mutate-gh381.js. + */ + + { + duk_small_uint_t args_op = args >> 8; + duk_small_uint_t args_rbp = args & 0xff; + duk_bool_t toplevel_assign; + + /* XXX: here we need to know if 'left' is left-hand-side compatible. + * That information is no longer available from current expr parsing + * state; it would need to be carried into the 'left' ivalue or by + * some other means. + */ + + /* A top-level assignment is e.g. "x = y;". For these it's safe + * to use the RHS as-is as the expression value, even if the RHS + * is a reg-bound identifier. The RHS ('res') is right associative + * so it has consumed all other assignment level operations; the + * only relevant lower binding power construct is comma operator + * which will ignore the expression value provided here. Usually + * the top level assignment expression value is ignored, but it + * is relevant for e.g. eval code. + */ + toplevel_assign = (comp_ctx->curr_func.nud_count == 1 && /* one token before */ + comp_ctx->curr_func.led_count == 1); /* one operator (= assign) */ + DUK_DDD(DUK_DDDPRINT("assignment: nud_count=%ld, led_count=%ld, toplevel_assign=%ld", + (long) comp_ctx->curr_func.nud_count, + (long) comp_ctx->curr_func.led_count, + (long) toplevel_assign)); + + if (left->t == DUK_IVAL_VAR) { + duk_hstring *h_varname; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + DUK_ASSERT(left->x1.t == DUK_ISPEC_VALUE); /* LHS is already side effect free */ + + h_varname = duk_known_hstring(thr, left->x1.valstack_idx); + if (duk__hstring_is_eval_or_arguments_in_strict_mode(comp_ctx, h_varname)) { + /* E5 Section 11.13.1 (and others for other assignments), step 4. */ + goto syntax_error_lvalue; + } + duk_dup(thr, left->x1.valstack_idx); + (void) duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname); + + if (args_op == DUK_OP_NONE) { + duk__expr(comp_ctx, res, args_rbp /*rbp_flags*/); + if (toplevel_assign) { + /* Any 'res' will do. */ + DUK_DDD(DUK_DDDPRINT("plain assignment, toplevel assign, use as is")); + } else { + /* 'res' must be a plain ivalue, and not register-bound variable. */ + DUK_DDD(DUK_DDDPRINT("plain assignment, not toplevel assign, ensure not a reg-bound identifier")); + if (res->t != DUK_IVAL_PLAIN || (res->x1.t == DUK_ISPEC_REGCONST && + DUK__ISREG_NOTTEMP(comp_ctx, res->x1.regconst))) { + duk__ivalue_totempconst(comp_ctx, res); + } + } + } else { + /* For X <op>= Y we need to evaluate the pre-op + * value of X before evaluating the RHS: the RHS + * can change X, but when we do <op> we must use + * the pre-op value. + */ + duk_regconst_t reg_temp; + + reg_temp = DUK__ALLOCTEMP(comp_ctx); + + if (reg_varbind >= 0) { + duk_regconst_t reg_res; + duk_regconst_t reg_src; + duk_int_t pc_temp_load; + duk_int_t pc_before_rhs; + duk_int_t pc_after_rhs; + + if (toplevel_assign) { + /* 'reg_varbind' is the operation result and can also + * become the expression value for top level assignments + * such as: "var x; x += y;". + */ + DUK_DD(DUK_DDPRINT("<op>= expression is top level, write directly to reg_varbind")); + reg_res = reg_varbind; + } else { + /* Not safe to use 'reg_varbind' as assignment expression + * value, so go through a temp. + */ + DUK_DD(DUK_DDPRINT("<op>= expression is not top level, write to reg_temp")); + reg_res = reg_temp; /* reg_res should be smallest possible */ + reg_temp = DUK__ALLOCTEMP(comp_ctx); + } + + /* Try to optimize X <op>= Y for reg-bound + * variables. Detect side-effect free RHS + * narrowly by seeing whether it emits code. + * If not, rewind the code emitter and overwrite + * the unnecessary temp reg load. + */ + + pc_temp_load = duk__get_current_pc(comp_ctx); + duk__emit_a_bc(comp_ctx, + DUK_OP_LDREG, + reg_temp, + reg_varbind); + + pc_before_rhs = duk__get_current_pc(comp_ctx); + duk__expr_toregconst(comp_ctx, res, args_rbp /*rbp_flags*/); + DUK_ASSERT(res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_REGCONST); + pc_after_rhs = duk__get_current_pc(comp_ctx); + + DUK_DD(DUK_DDPRINT("pc_temp_load=%ld, pc_before_rhs=%ld, pc_after_rhs=%ld", + (long) pc_temp_load, (long) pc_before_rhs, + (long) pc_after_rhs)); + + if (pc_after_rhs == pc_before_rhs) { + /* Note: if the reg_temp load generated shuffling + * instructions, we may need to rewind more than + * one instruction, so use explicit PC computation. + */ + DUK_DD(DUK_DDPRINT("rhs is side effect free, rewind and avoid unnecessary temp for reg-based <op>=")); + DUK_BW_ADD_PTR(comp_ctx->thr, &comp_ctx->curr_func.bw_code, (pc_temp_load - pc_before_rhs) * (duk_int_t) sizeof(duk_compiler_instr)); + reg_src = reg_varbind; + } else { + DUK_DD(DUK_DDPRINT("rhs evaluation emitted code, not sure if rhs is side effect free; use temp reg for LHS")); + reg_src = reg_temp; + } + + duk__emit_a_b_c(comp_ctx, + args_op | DUK__EMIT_FLAG_BC_REGCONST, + reg_res, + reg_src, + res->x1.regconst); + + res->x1.regconst = reg_res; + + /* Ensure compact use of temps. */ + if (DUK__ISREG_TEMP(comp_ctx, reg_res)) { + DUK__SETTEMP(comp_ctx, reg_res + 1); + } + } else { + /* When LHS is not register bound, always go through a + * temporary. No optimization for top level assignment. + */ + + duk__emit_a_bc(comp_ctx, + DUK_OP_GETVAR, + reg_temp, + rc_varname); + + duk__expr_toregconst(comp_ctx, res, args_rbp /*rbp_flags*/); + DUK_ASSERT(res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_REGCONST); + + duk__emit_a_b_c(comp_ctx, + args_op | DUK__EMIT_FLAG_BC_REGCONST, + reg_temp, + reg_temp, + res->x1.regconst); + res->x1.regconst = reg_temp; + } + + DUK_ASSERT(res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_REGCONST); + } + + /* At this point 'res' holds the potential expression value. + * It can be basically any ivalue here, including a reg-bound + * identifier (if code above deems it safe) or a unary/binary + * operation. Operations must be resolved to a side effect free + * plain value, and the side effects must happen exactly once. + */ + + if (reg_varbind >= 0) { + if (res->t != DUK_IVAL_PLAIN) { + /* Resolve 'res' directly into the LHS binding, and use + * that as the expression value if safe. If not safe, + * resolve to a temp/const and copy to LHS. + */ + if (toplevel_assign) { + duk__ivalue_toforcedreg(comp_ctx, res, (duk_int_t) reg_varbind); + } else { + duk__ivalue_totempconst(comp_ctx, res); + duk__copy_ivalue(comp_ctx, res, left); /* use 'left' as a temp */ + duk__ivalue_toforcedreg(comp_ctx, left, (duk_int_t) reg_varbind); + } + } else { + /* Use 'res' as the expression value (it's side effect + * free and may be a plain value, a register, or a + * constant) and write it to the LHS binding too. + */ + duk__copy_ivalue(comp_ctx, res, left); /* use 'left' as a temp */ + duk__ivalue_toforcedreg(comp_ctx, left, (duk_int_t) reg_varbind); + } + } else { + /* Only a reg fits into 'A' so coerce 'res' into a register + * for PUTVAR. + * + * XXX: here the current A/B/C split is suboptimal: we could + * just use 9 bits for reg_res (and support constants) and 17 + * instead of 18 bits for the varname const index. + */ + + duk__ivalue_toreg(comp_ctx, res); + duk__emit_a_bc(comp_ctx, + DUK_OP_PUTVAR | DUK__EMIT_FLAG_A_IS_SOURCE, + res->x1.regconst, + rc_varname); + } + + /* 'res' contains expression value */ + } else if (left->t == DUK_IVAL_PROP) { + /* E5 Section 11.13.1 (and others) step 4 never matches for prop writes -> no check */ + duk_regconst_t reg_obj; + duk_regconst_t rc_key; + duk_regconst_t rc_res; + duk_regconst_t reg_temp; + + /* Property access expressions ('a[b]') are critical to correct + * LHS evaluation ordering, see test-dev-assign-eval-order*.js. + * We must make sure that the LHS target slot (base object and + * key) don't change during RHS evaluation. The only concrete + * problem is a register reference to a variable-bound register + * (i.e., non-temp). Require temp regs for both key and base. + * + * Don't allow a constant for the object (even for a number + * etc), as it goes into the 'A' field of the opcode. + */ + + reg_obj = duk__ispec_toregconst_raw(comp_ctx, + &left->x1, + -1 /*forced_reg*/, + DUK__IVAL_FLAG_REQUIRE_TEMP /*flags*/); + + rc_key = duk__ispec_toregconst_raw(comp_ctx, + &left->x2, + -1 /*forced_reg*/, + DUK__IVAL_FLAG_REQUIRE_TEMP | DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); + + /* Evaluate RHS only when LHS is safe. */ + + if (args_op == DUK_OP_NONE) { + duk__expr_toregconst(comp_ctx, res, args_rbp /*rbp_flags*/); + DUK_ASSERT(res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_REGCONST); + rc_res = res->x1.regconst; + } else { + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__emit_a_b_c(comp_ctx, + DUK_OP_GETPROP | DUK__EMIT_FLAG_BC_REGCONST, + reg_temp, + reg_obj, + rc_key); + + duk__expr_toregconst(comp_ctx, res, args_rbp /*rbp_flags*/); + DUK_ASSERT(res->t == DUK_IVAL_PLAIN && res->x1.t == DUK_ISPEC_REGCONST); + + duk__emit_a_b_c(comp_ctx, + args_op | DUK__EMIT_FLAG_BC_REGCONST, + reg_temp, + reg_temp, + res->x1.regconst); + rc_res = reg_temp; + } + + duk__emit_a_b_c(comp_ctx, + DUK_OP_PUTPROP | DUK__EMIT_FLAG_A_IS_SOURCE | DUK__EMIT_FLAG_BC_REGCONST, + reg_obj, + rc_key, + rc_res); + + duk__ivalue_regconst(res, rc_res); + } else { + /* No support for lvalues returned from new or function call expressions. + * However, these must NOT cause compile-time SyntaxErrors, but run-time + * ReferenceErrors. Both left and right sides of the assignment must be + * evaluated before throwing a ReferenceError. For instance: + * + * f() = g(); + * + * must result in f() being evaluated, then g() being evaluated, and + * finally, a ReferenceError being thrown. See E5 Section 11.13.1. + */ + + duk_regconst_t rc_res; + + /* First evaluate LHS fully to ensure all side effects are out. */ + duk__ivalue_toplain_ignore(comp_ctx, left); + + /* Then evaluate RHS fully (its value becomes the expression value too). + * Technically we'd need the side effect safety check here too, but because + * we always throw using INVLHS the result doesn't matter. + */ + rc_res = duk__expr_toregconst(comp_ctx, res, args_rbp /*rbp_flags*/); + + duk__emit_op_only(comp_ctx, DUK_OP_INVLHS); + + duk__ivalue_regconst(res, rc_res); + } + + return; + } + + postincdec: + { + /* + * Post-increment/decrement will return the original value as its + * result value. However, even that value will be coerced using + * ToNumber() which is quite awkward. Specific bytecode opcodes + * are used to handle these semantics. + * + * Note that post increment/decrement has a "no LineTerminator here" + * restriction. This is handled by duk__expr_lbp(), which forcibly terminates + * the previous expression if a LineTerminator occurs before '++'/'--'. + */ + + duk_regconst_t reg_res; + duk_small_uint_t args_op1 = (args >> 8) & 0xff; /* DUK_OP_POSTINCR/DUK_OP_POSTDECR */ + duk_small_uint_t args_op2 = args >> 16; /* DUK_OP_POSTINCP_RR/DUK_OP_POSTDECP_RR */ + + /* Specific assumptions for opcode numbering. */ + DUK_ASSERT(DUK_OP_POSTINCR + 4 == DUK_OP_POSTINCV); + DUK_ASSERT(DUK_OP_POSTDECR + 4 == DUK_OP_POSTDECV); + + reg_res = DUK__ALLOCTEMP(comp_ctx); + + if (left->t == DUK_IVAL_VAR) { + duk_hstring *h_varname; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + h_varname = duk_known_hstring(thr, left->x1.valstack_idx); + + if (duk__hstring_is_eval_or_arguments_in_strict_mode(comp_ctx, h_varname)) { + goto syntax_error; + } + + duk_dup(thr, left->x1.valstack_idx); + if (duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + duk__emit_a_bc(comp_ctx, + args_op1, /* e.g. DUK_OP_POSTINCR */ + reg_res, + reg_varbind); + } else { + duk__emit_a_bc(comp_ctx, + args_op1 + 4, /* e.g. DUK_OP_POSTINCV */ + reg_res, + rc_varname); + } + + DUK_DDD(DUK_DDDPRINT("postincdec to '%!O' -> reg_varbind=%ld, rc_varname=%ld", + (duk_heaphdr *) h_varname, (long) reg_varbind, (long) rc_varname)); + } else if (left->t == DUK_IVAL_PROP) { + duk_regconst_t reg_obj; /* allocate to reg only (not const) */ + duk_regconst_t rc_key; + + reg_obj = duk__ispec_toregconst_raw(comp_ctx, &left->x1, -1 /*forced_reg*/, 0 /*flags*/); /* don't allow const */ + rc_key = duk__ispec_toregconst_raw(comp_ctx, &left->x2, -1 /*forced_reg*/, DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); + duk__emit_a_b_c(comp_ctx, + args_op2 | DUK__EMIT_FLAG_BC_REGCONST, /* e.g. DUK_OP_POSTINCP */ + reg_res, + reg_obj, + rc_key); + } else { + /* Technically return value is not needed because INVLHS will + * unconditially throw a ReferenceError. Coercion is necessary + * for proper semantics (consider ToNumber() called for an object). + * Use DUK_OP_UNP with a dummy register to get ToNumber(). + */ + duk__ivalue_toforcedreg(comp_ctx, left, reg_res); + duk__emit_bc(comp_ctx, + DUK_OP_UNP, + reg_res); /* for side effects, result ignored */ + duk__emit_op_only(comp_ctx, + DUK_OP_INVLHS); + } + + DUK__SETTEMP(comp_ctx, reg_res + 1); + duk__ivalue_regconst(res, reg_res); + return; + } + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_EXPRESSION); + DUK_WO_NORETURN(return;); + + syntax_error_lvalue: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_LVALUE); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL duk_small_uint_t duk__expr_lbp(duk_compiler_ctx *comp_ctx) { + duk_small_uint_t tok = comp_ctx->curr_token.t; + + DUK_ASSERT_DISABLE(tok >= DUK_TOK_MINVAL); /* unsigned */ + DUK_ASSERT(tok <= DUK_TOK_MAXVAL); + DUK_ASSERT(sizeof(duk__token_lbp) == DUK_TOK_MAXVAL + 1); + + /* XXX: integrate support for this into led() instead? + * Similar issue as post-increment/post-decrement. + */ + + /* prevent duk__expr_led() by using a binding power less than anything valid */ + if (tok == DUK_TOK_IN && !comp_ctx->curr_func.allow_in) { + return 0; + } + + if ((tok == DUK_TOK_DECREMENT || tok == DUK_TOK_INCREMENT) && + (comp_ctx->curr_token.lineterm)) { + /* '++' or '--' in a post-increment/decrement position, + * and a LineTerminator occurs between the operator and + * the preceding expression. Force the previous expr + * to terminate, in effect treating e.g. "a,b\n++" as + * "a,b;++" (= SyntaxError). + */ + return 0; + } + + return DUK__TOKEN_LBP_GET_BP(duk__token_lbp[tok]); /* format is bit packed */ +} + +/* + * Expression parsing. + * + * Upon entry to 'expr' and its variants, 'curr_tok' is assumed to be the + * first token of the expression. Upon exit, 'curr_tok' will be the first + * token not part of the expression (e.g. semicolon terminating an expression + * statement). + */ + +#define DUK__EXPR_RBP_MASK 0xff +#define DUK__EXPR_FLAG_REJECT_IN (1 << 8) /* reject 'in' token (used for for-in) */ +#define DUK__EXPR_FLAG_ALLOW_EMPTY (1 << 9) /* allow empty expression */ +#define DUK__EXPR_FLAG_REQUIRE_INIT (1 << 10) /* require initializer for var/const */ + +/* main expression parser function */ +DUK_LOCAL void duk__expr(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk_hthread *thr = comp_ctx->thr; + duk_ivalue tmp_alloc; /* 'res' is used for "left", and 'tmp' for "right" */ + duk_ivalue *tmp = &tmp_alloc; + duk_small_uint_t rbp; + + DUK__RECURSION_INCREASE(comp_ctx, thr); + + duk_require_stack(thr, DUK__PARSE_EXPR_SLOTS); + + /* filter out flags from exprtop rbp_flags here to save space */ + rbp = rbp_flags & DUK__EXPR_RBP_MASK; + + DUK_DDD(DUK_DDDPRINT("duk__expr(), rbp_flags=%ld, rbp=%ld, allow_in=%ld, paren_level=%ld", + (long) rbp_flags, (long) rbp, (long) comp_ctx->curr_func.allow_in, + (long) comp_ctx->curr_func.paren_level)); + + duk_memzero(&tmp_alloc, sizeof(tmp_alloc)); + tmp->x1.valstack_idx = duk_get_top(thr); + tmp->x2.valstack_idx = tmp->x1.valstack_idx + 1; + duk_push_undefined(thr); + duk_push_undefined(thr); + + /* XXX: where to release temp regs in intermediate expressions? + * e.g. 1+2+3 -> don't inflate temp register count when parsing this. + * that particular expression temp regs can be forced here. + */ + + /* XXX: increase ctx->expr_tokens here for every consumed token + * (this would be a nice statistic)? + */ + + if (comp_ctx->curr_token.t == DUK_TOK_SEMICOLON || comp_ctx->curr_token.t == DUK_TOK_RPAREN) { + /* XXX: possibly incorrect handling of empty expression */ + DUK_DDD(DUK_DDDPRINT("empty expression")); + if (!(rbp_flags & DUK__EXPR_FLAG_ALLOW_EMPTY)) { + DUK_ERROR_SYNTAX(thr, DUK_STR_EMPTY_EXPR_NOT_ALLOWED); + DUK_WO_NORETURN(return;); + } + duk_push_undefined(thr); + duk__ivalue_plain_fromstack(comp_ctx, res); + goto cleanup; + } + + duk__advance(comp_ctx); + duk__expr_nud(comp_ctx, res); /* reuse 'res' as 'left' */ + while (rbp < duk__expr_lbp(comp_ctx)) { + duk__advance(comp_ctx); + duk__expr_led(comp_ctx, res, tmp); + duk__copy_ivalue(comp_ctx, tmp, res); /* tmp -> res */ + } + + cleanup: + /* final result is already in 'res' */ + + duk_pop_2(thr); + + DUK__RECURSION_DECREASE(comp_ctx, thr); +} + +DUK_LOCAL void duk__exprtop(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk_hthread *thr = comp_ctx->thr; + + /* Note: these variables must reside in 'curr_func' instead of the global + * context: when parsing function expressions, expression parsing is nested. + */ + comp_ctx->curr_func.nud_count = 0; + comp_ctx->curr_func.led_count = 0; + comp_ctx->curr_func.paren_level = 0; + comp_ctx->curr_func.expr_lhs = 1; + comp_ctx->curr_func.allow_in = (rbp_flags & DUK__EXPR_FLAG_REJECT_IN ? 0 : 1); + + duk__expr(comp_ctx, res, rbp_flags); + + if (!(rbp_flags & DUK__EXPR_FLAG_ALLOW_EMPTY) && duk__expr_is_empty(comp_ctx)) { + DUK_ERROR_SYNTAX(thr, DUK_STR_EMPTY_EXPR_NOT_ALLOWED); + DUK_WO_NORETURN(return;); + } +} + +/* A bunch of helpers (for size optimization) that combine duk__expr()/duk__exprtop() + * and result conversions. + * + * Each helper needs at least 2-3 calls to make it worth while to wrap. + */ + +#if 0 /* unused */ +DUK_LOCAL duk_regconst_t duk__expr_toreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__expr(comp_ctx, res, rbp_flags); + return duk__ivalue_toreg(comp_ctx, res); +} +#endif + +#if 0 /* unused */ +DUK_LOCAL duk_regconst_t duk__expr_totemp(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__expr(comp_ctx, res, rbp_flags); + return duk__ivalue_totemp(comp_ctx, res); +} +#endif + +DUK_LOCAL void duk__expr_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags, duk_regconst_t forced_reg) { + DUK_ASSERT(forced_reg >= 0); + duk__expr(comp_ctx, res, rbp_flags); + duk__ivalue_toforcedreg(comp_ctx, res, forced_reg); +} + +DUK_LOCAL duk_regconst_t duk__expr_toregconst(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__expr(comp_ctx, res, rbp_flags); + return duk__ivalue_toregconst(comp_ctx, res); +} + +#if 0 /* unused */ +DUK_LOCAL duk_regconst_t duk__expr_totempconst(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__expr(comp_ctx, res, rbp_flags); + return duk__ivalue_totempconst(comp_ctx, res); +} +#endif + +DUK_LOCAL void duk__expr_toplain(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__expr(comp_ctx, res, rbp_flags); + duk__ivalue_toplain(comp_ctx, res); +} + +DUK_LOCAL void duk__expr_toplain_ignore(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__expr(comp_ctx, res, rbp_flags); + duk__ivalue_toplain_ignore(comp_ctx, res); +} + +DUK_LOCAL duk_regconst_t duk__exprtop_toreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__exprtop(comp_ctx, res, rbp_flags); + return duk__ivalue_toreg(comp_ctx, res); +} + +#if 0 /* unused */ +DUK_LOCAL duk_regconst_t duk__exprtop_totemp(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__exprtop(comp_ctx, res, rbp_flags); + return duk__ivalue_totemp(comp_ctx, res); +} +#endif + +DUK_LOCAL void duk__exprtop_toforcedreg(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags, duk_regconst_t forced_reg) { + DUK_ASSERT(forced_reg >= 0); + duk__exprtop(comp_ctx, res, rbp_flags); + duk__ivalue_toforcedreg(comp_ctx, res, forced_reg); +} + +DUK_LOCAL duk_regconst_t duk__exprtop_toregconst(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t rbp_flags) { + duk__exprtop(comp_ctx, res, rbp_flags); + return duk__ivalue_toregconst(comp_ctx, res); +} + +#if 0 /* unused */ +DUK_LOCAL void duk__exprtop_toplain_ignore(duk_compiler_ctx *comp_ctx, duk_ivalue *res, int rbp_flags) { + duk__exprtop(comp_ctx, res, rbp_flags); + duk__ivalue_toplain_ignore(comp_ctx, res); +} +#endif + +/* + * Parse an individual source element (top level statement) or a statement. + * + * Handles labeled statements automatically (peeling away labels before + * parsing an expression that follows the label(s)). + * + * Upon entry, 'curr_tok' contains the first token of the statement (parsed + * in "allow regexp literal" mode). Upon exit, 'curr_tok' contains the first + * token following the statement (if the statement has a terminator, this is + * the token after the terminator). + */ + +#define DUK__HAS_VAL (1 << 0) /* stmt has non-empty value */ +#define DUK__HAS_TERM (1 << 1) /* stmt has explicit/implicit semicolon terminator */ +#define DUK__ALLOW_AUTO_SEMI_ALWAYS (1 << 2) /* allow automatic semicolon even without lineterm (compatibility) */ +#define DUK__STILL_PROLOGUE (1 << 3) /* statement does not terminate directive prologue */ +#define DUK__IS_TERMINAL (1 << 4) /* statement is guaranteed to be terminal (control doesn't flow to next statement) */ + +/* Parse a single variable declaration (e.g. "i" or "i=10"). A leading 'var' + * has already been eaten. These is no return value in 'res', it is used only + * as a temporary. + * + * When called from 'for-in' statement parser, the initializer expression must + * not allow the 'in' token. The caller supply additional expression parsing + * flags (like DUK__EXPR_FLAG_REJECT_IN) in 'expr_flags'. + * + * Finally, out_rc_varname and out_reg_varbind are updated to reflect where + * the identifier is bound: + * + * If register bound: out_reg_varbind >= 0, out_rc_varname == 0 (ignore) + * If not register bound: out_reg_varbind < 0, out_rc_varname >= 0 + * + * These allow the caller to use the variable for further assignment, e.g. + * as is done in 'for-in' parsing. + */ + +DUK_LOCAL void duk__parse_var_decl(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t expr_flags, duk_regconst_t *out_reg_varbind, duk_regconst_t *out_rc_varname) { + duk_hthread *thr = comp_ctx->thr; + duk_hstring *h_varname; + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + /* assume 'var' has been eaten */ + + /* Note: Identifier rejects reserved words */ + if (comp_ctx->curr_token.t != DUK_TOK_IDENTIFIER) { + goto syntax_error; + } + h_varname = comp_ctx->curr_token.str1; + + DUK_ASSERT(h_varname != NULL); + + /* strict mode restrictions (E5 Section 12.2.1) */ + if (duk__hstring_is_eval_or_arguments_in_strict_mode(comp_ctx, h_varname)) { + goto syntax_error; + } + + /* register declarations in first pass */ + if (comp_ctx->curr_func.in_scanning) { + duk_uarridx_t n; + DUK_DDD(DUK_DDDPRINT("register variable declaration %!O in pass 1", + (duk_heaphdr *) h_varname)); + n = (duk_uarridx_t) duk_get_length(thr, comp_ctx->curr_func.decls_idx); + duk_push_hstring(thr, h_varname); + duk_put_prop_index(thr, comp_ctx->curr_func.decls_idx, n); + duk_push_int(thr, DUK_DECL_TYPE_VAR + (0 << 8)); + duk_put_prop_index(thr, comp_ctx->curr_func.decls_idx, n + 1); + } + + duk_push_hstring(thr, h_varname); /* push before advancing to keep reachable */ + + /* register binding lookup is based on varmap (even in first pass) */ + duk_dup_top(thr); + (void) duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname); + + duk__advance(comp_ctx); /* eat identifier */ + + if (comp_ctx->curr_token.t == DUK_TOK_EQUALSIGN) { + duk__advance(comp_ctx); + + DUK_DDD(DUK_DDDPRINT("vardecl, assign to '%!O' -> reg_varbind=%ld, rc_varname=%ld", + (duk_heaphdr *) h_varname, (long) reg_varbind, (long) rc_varname)); + + duk__exprtop(comp_ctx, res, DUK__BP_COMMA | expr_flags /*rbp_flags*/); /* AssignmentExpression */ + + if (reg_varbind >= 0) { + duk__ivalue_toforcedreg(comp_ctx, res, reg_varbind); + } else { + duk_regconst_t reg_val; + reg_val = duk__ivalue_toreg(comp_ctx, res); + duk__emit_a_bc(comp_ctx, + DUK_OP_PUTVAR | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_val, + rc_varname); + } + } else { + if (expr_flags & DUK__EXPR_FLAG_REQUIRE_INIT) { + /* Used for minimal 'const': initializer required. */ + goto syntax_error; + } + } + + duk_pop(thr); /* pop varname */ + + *out_rc_varname = rc_varname; + *out_reg_varbind = reg_varbind; + + return; + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_VAR_DECLARATION); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__parse_var_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_small_uint_t expr_flags) { + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + duk__advance(comp_ctx); /* eat 'var' */ + + for (;;) { + /* rc_varname and reg_varbind are ignored here */ + duk__parse_var_decl(comp_ctx, res, 0 | expr_flags, ®_varbind, &rc_varname); + + if (comp_ctx->curr_token.t != DUK_TOK_COMMA) { + break; + } + duk__advance(comp_ctx); + } +} + +DUK_LOCAL void duk__parse_for_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site) { + duk_hthread *thr = comp_ctx->thr; + duk_int_t pc_v34_lhs; /* start variant 3/4 left-hand-side code (L1 in doc/compiler.rst example) */ + duk_regconst_t temp_reset; /* knock back "next temp" to this whenever possible */ + duk_regconst_t reg_temps; /* preallocated temporaries (2) for variants 3 and 4 */ + + DUK_DDD(DUK_DDDPRINT("start parsing a for/for-in statement")); + + /* Two temporaries are preallocated here for variants 3 and 4 which need + * registers which are never clobbered by expressions in the loop + * (concretely: for the enumerator object and the next enumerated value). + * Variants 1 and 2 "release" these temps. + */ + + reg_temps = DUK__ALLOCTEMPS(comp_ctx, 2); + + temp_reset = DUK__GETTEMP(comp_ctx); + + /* + * For/for-in main variants are: + * + * 1. for (ExpressionNoIn_opt; Expression_opt; Expression_opt) Statement + * 2. for (var VariableDeclarationNoIn; Expression_opt; Expression_opt) Statement + * 3. for (LeftHandSideExpression in Expression) Statement + * 4. for (var VariableDeclarationNoIn in Expression) Statement + * + * Parsing these without arbitrary lookahead or backtracking is relatively + * tricky but we manage to do so for now. + * + * See doc/compiler.rst for a detailed discussion of control flow + * issues, evaluation order issues, etc. + */ + + duk__advance(comp_ctx); /* eat 'for' */ + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + + DUK_DDD(DUK_DDDPRINT("detecting for/for-in loop variant, pc=%ld", (long) duk__get_current_pc(comp_ctx))); + + /* a label site has been emitted by duk__parse_stmt() automatically + * (it will also emit the ENDLABEL). + */ + + if (comp_ctx->curr_token.t == DUK_TOK_VAR) { + /* + * Variant 2 or 4 + */ + + duk_regconst_t reg_varbind; /* variable binding register if register-bound (otherwise < 0) */ + duk_regconst_t rc_varname; /* variable name reg/const, if variable not register-bound */ + + duk__advance(comp_ctx); /* eat 'var' */ + duk__parse_var_decl(comp_ctx, res, DUK__EXPR_FLAG_REJECT_IN, ®_varbind, &rc_varname); + DUK__SETTEMP(comp_ctx, temp_reset); + + if (comp_ctx->curr_token.t == DUK_TOK_IN) { + /* + * Variant 4 + */ + + DUK_DDD(DUK_DDDPRINT("detected for variant 4: for (var VariableDeclarationNoIn in Expression) Statement")); + pc_v34_lhs = duk__get_current_pc(comp_ctx); /* jump is inserted here */ + if (reg_varbind >= 0) { + duk__emit_a_bc(comp_ctx, + DUK_OP_LDREG, + reg_varbind, + reg_temps + 0); + } else { + duk__emit_a_bc(comp_ctx, + DUK_OP_PUTVAR | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_temps + 0, + rc_varname); + } + goto parse_3_or_4; + } else { + /* + * Variant 2 + */ + + DUK_DDD(DUK_DDDPRINT("detected for variant 2: for (var VariableDeclarationNoIn; Expression_opt; Expression_opt) Statement")); + for (;;) { + /* more initializers */ + if (comp_ctx->curr_token.t != DUK_TOK_COMMA) { + break; + } + DUK_DDD(DUK_DDDPRINT("variant 2 has another variable initializer")); + + duk__advance(comp_ctx); /* eat comma */ + duk__parse_var_decl(comp_ctx, res, DUK__EXPR_FLAG_REJECT_IN, ®_varbind, &rc_varname); + } + goto parse_1_or_2; + } + } else { + /* + * Variant 1 or 3 + */ + + pc_v34_lhs = duk__get_current_pc(comp_ctx); /* jump is inserted here (variant 3) */ + + /* Note that duk__exprtop() here can clobber any reg above current temp_next, + * so any loop variables (e.g. enumerator) must be "preallocated". + */ + + /* don't coerce yet to a plain value (variant 3 needs special handling) */ + duk__exprtop(comp_ctx, res, DUK__BP_FOR_EXPR | DUK__EXPR_FLAG_REJECT_IN | DUK__EXPR_FLAG_ALLOW_EMPTY /*rbp_flags*/); /* Expression */ + if (comp_ctx->curr_token.t == DUK_TOK_IN) { + /* + * Variant 3 + */ + + /* XXX: need to determine LHS type, and check that it is LHS compatible */ + DUK_DDD(DUK_DDDPRINT("detected for variant 3: for (LeftHandSideExpression in Expression) Statement")); + if (duk__expr_is_empty(comp_ctx)) { + goto syntax_error; /* LeftHandSideExpression does not allow empty expression */ + } + + if (res->t == DUK_IVAL_VAR) { + duk_regconst_t reg_varbind; + duk_regconst_t rc_varname; + + duk_dup(thr, res->x1.valstack_idx); + if (duk__lookup_lhs(comp_ctx, ®_varbind, &rc_varname)) { + duk__emit_a_bc(comp_ctx, + DUK_OP_LDREG, + reg_varbind, + reg_temps + 0); + } else { + duk__emit_a_bc(comp_ctx, + DUK_OP_PUTVAR | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_temps + 0, + rc_varname); + } + } else if (res->t == DUK_IVAL_PROP) { + /* Don't allow a constant for the object (even for a number etc), as + * it goes into the 'A' field of the opcode. + */ + duk_regconst_t reg_obj; + duk_regconst_t rc_key; + reg_obj = duk__ispec_toregconst_raw(comp_ctx, &res->x1, -1 /*forced_reg*/, 0 /*flags*/); /* don't allow const */ + rc_key = duk__ispec_toregconst_raw(comp_ctx, &res->x2, -1 /*forced_reg*/, DUK__IVAL_FLAG_ALLOW_CONST /*flags*/); + duk__emit_a_b_c(comp_ctx, + DUK_OP_PUTPROP | DUK__EMIT_FLAG_A_IS_SOURCE | DUK__EMIT_FLAG_BC_REGCONST, + reg_obj, + rc_key, + reg_temps + 0); + } else { + duk__ivalue_toplain_ignore(comp_ctx, res); /* just in case */ + duk__emit_op_only(comp_ctx, + DUK_OP_INVLHS); + } + goto parse_3_or_4; + } else { + /* + * Variant 1 + */ + + DUK_DDD(DUK_DDDPRINT("detected for variant 1: for (ExpressionNoIn_opt; Expression_opt; Expression_opt) Statement")); + duk__ivalue_toplain_ignore(comp_ctx, res); + goto parse_1_or_2; + } + } + + parse_1_or_2: + /* + * Parse variant 1 or 2. The first part expression (which differs + * in the variants) has already been parsed and its code emitted. + * + * reg_temps + 0: unused + * reg_temps + 1: unused + */ + { + duk_regconst_t rc_cond; + duk_int_t pc_l1, pc_l2, pc_l3, pc_l4; + duk_int_t pc_jumpto_l3, pc_jumpto_l4; + duk_bool_t expr_c_empty; + + DUK_DDD(DUK_DDDPRINT("shared code for parsing variants 1 and 2")); + + /* "release" preallocated temps since we won't need them */ + temp_reset = reg_temps + 0; + DUK__SETTEMP(comp_ctx, temp_reset); + + duk__advance_expect(comp_ctx, DUK_TOK_SEMICOLON); + + pc_l1 = duk__get_current_pc(comp_ctx); + duk__exprtop(comp_ctx, res, DUK__BP_FOR_EXPR | DUK__EXPR_FLAG_ALLOW_EMPTY /*rbp_flags*/); /* Expression_opt */ + if (duk__expr_is_empty(comp_ctx)) { + /* no need to coerce */ + pc_jumpto_l3 = duk__emit_jump_empty(comp_ctx); /* to body */ + pc_jumpto_l4 = -1; /* omitted */ + } else { + rc_cond = duk__ivalue_toregconst(comp_ctx, res); + duk__emit_if_false_skip(comp_ctx, rc_cond); + pc_jumpto_l3 = duk__emit_jump_empty(comp_ctx); /* to body */ + pc_jumpto_l4 = duk__emit_jump_empty(comp_ctx); /* to exit */ + } + DUK__SETTEMP(comp_ctx, temp_reset); + + duk__advance_expect(comp_ctx, DUK_TOK_SEMICOLON); + + pc_l2 = duk__get_current_pc(comp_ctx); + duk__exprtop(comp_ctx, res, DUK__BP_FOR_EXPR | DUK__EXPR_FLAG_ALLOW_EMPTY /*rbp_flags*/); /* Expression_opt */ + if (duk__expr_is_empty(comp_ctx)) { + /* no need to coerce */ + expr_c_empty = 1; + /* JUMP L1 omitted */ + } else { + duk__ivalue_toplain_ignore(comp_ctx, res); + expr_c_empty = 0; + duk__emit_jump(comp_ctx, pc_l1); + } + DUK__SETTEMP(comp_ctx, temp_reset); + + comp_ctx->curr_func.allow_regexp_in_adv = 1; + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* Allow RegExp as part of next stmt. */ + + pc_l3 = duk__get_current_pc(comp_ctx); + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + if (expr_c_empty) { + duk__emit_jump(comp_ctx, pc_l1); + } else { + duk__emit_jump(comp_ctx, pc_l2); + } + /* temp reset is not necessary after duk__parse_stmt(), which already does it */ + + pc_l4 = duk__get_current_pc(comp_ctx); + + DUK_DDD(DUK_DDDPRINT("patching jumps: jumpto_l3: %ld->%ld, jumpto_l4: %ld->%ld, " + "break: %ld->%ld, continue: %ld->%ld", + (long) pc_jumpto_l3, (long) pc_l3, (long) pc_jumpto_l4, (long) pc_l4, + (long) (pc_label_site + 1), (long) pc_l4, (long) (pc_label_site + 2), (long) pc_l2)); + + duk__patch_jump(comp_ctx, pc_jumpto_l3, pc_l3); + duk__patch_jump(comp_ctx, pc_jumpto_l4, pc_l4); + duk__patch_jump(comp_ctx, + pc_label_site + 1, + pc_l4); /* break jump */ + duk__patch_jump(comp_ctx, + pc_label_site + 2, + expr_c_empty ? pc_l1 : pc_l2); /* continue jump */ + } + goto finished; + + parse_3_or_4: + /* + * Parse variant 3 or 4. + * + * For variant 3 (e.g. "for (A in C) D;") the code for A (except the + * final property/variable write) has already been emitted. The first + * instruction of that code is at pc_v34_lhs; a JUMP needs to be inserted + * there to satisfy control flow needs. + * + * For variant 4, if the variable declaration had an initializer + * (e.g. "for (var A = B in C) D;") the code for the assignment + * (B) has already been emitted. + * + * Variables set before entering here: + * + * pc_v34_lhs: insert a "JUMP L2" here (see doc/compiler.rst example). + * reg_temps + 0: iteration target value (written to LHS) + * reg_temps + 1: enumerator object + */ + { + duk_int_t pc_l1, pc_l2, pc_l3, pc_l4, pc_l5; + duk_int_t pc_jumpto_l2, pc_jumpto_l3, pc_jumpto_l4, pc_jumpto_l5; + duk_regconst_t reg_target; + + DUK_DDD(DUK_DDDPRINT("shared code for parsing variants 3 and 4, pc_v34_lhs=%ld", (long) pc_v34_lhs)); + + DUK__SETTEMP(comp_ctx, temp_reset); + + /* First we need to insert a jump in the middle of previously + * emitted code to get the control flow right. No jumps can + * cross the position where the jump is inserted. See doc/compiler.rst + * for discussion on the intricacies of control flow and side effects + * for variants 3 and 4. + */ + + duk__insert_jump_entry(comp_ctx, pc_v34_lhs); + pc_jumpto_l2 = pc_v34_lhs; /* inserted jump */ + pc_l1 = pc_v34_lhs + 1; /* +1, right after inserted jump */ + + /* The code for writing reg_temps + 0 to the left hand side has already + * been emitted. + */ + + pc_jumpto_l3 = duk__emit_jump_empty(comp_ctx); /* -> loop body */ + + duk__advance(comp_ctx); /* eat 'in' */ + + /* Parse enumeration target and initialize enumerator. For 'null' and 'undefined', + * INITENUM will creates a 'null' enumerator which works like an empty enumerator + * (E5 Section 12.6.4, step 3). Note that INITENUM requires the value to be in a + * register (constant not allowed). + */ + + pc_l2 = duk__get_current_pc(comp_ctx); + reg_target = duk__exprtop_toreg(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); /* Expression */ + duk__emit_b_c(comp_ctx, + DUK_OP_INITENUM | DUK__EMIT_FLAG_B_IS_TARGET, + reg_temps + 1, + reg_target); + pc_jumpto_l4 = duk__emit_jump_empty(comp_ctx); + DUK__SETTEMP(comp_ctx, temp_reset); + + comp_ctx->curr_func.allow_regexp_in_adv = 1; + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* Allow RegExp as part of next stmt. */ + + pc_l3 = duk__get_current_pc(comp_ctx); + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + /* temp reset is not necessary after duk__parse_stmt(), which already does it */ + + /* NEXTENUM needs a jump slot right after the main opcode. + * We need the code emitter to reserve the slot: if there's + * target shuffling, the target shuffle opcodes must happen + * after the jump slot (for NEXTENUM the shuffle opcodes are + * not needed if the enum is finished). + */ + pc_l4 = duk__get_current_pc(comp_ctx); + duk__emit_b_c(comp_ctx, + DUK_OP_NEXTENUM | DUK__EMIT_FLAG_B_IS_TARGET | DUK__EMIT_FLAG_RESERVE_JUMPSLOT, + reg_temps + 0, + reg_temps + 1); + pc_jumpto_l5 = comp_ctx->emit_jumpslot_pc; /* NEXTENUM jump slot: executed when enum finished */ + duk__emit_jump(comp_ctx, pc_l1); /* jump to next loop, using reg_v34_iter as iterated value */ + + pc_l5 = duk__get_current_pc(comp_ctx); + + /* XXX: since the enumerator may be a memory expensive object, + * perhaps clear it explicitly here? If so, break jump must + * go through this clearing operation. + */ + + DUK_DDD(DUK_DDDPRINT("patching jumps: jumpto_l2: %ld->%ld, jumpto_l3: %ld->%ld, " + "jumpto_l4: %ld->%ld, jumpto_l5: %ld->%ld, " + "break: %ld->%ld, continue: %ld->%ld", + (long) pc_jumpto_l2, (long) pc_l2, (long) pc_jumpto_l3, (long) pc_l3, + (long) pc_jumpto_l4, (long) pc_l4, (long) pc_jumpto_l5, (long) pc_l5, + (long) (pc_label_site + 1), (long) pc_l5, (long) (pc_label_site + 2), (long) pc_l4)); + + duk__patch_jump(comp_ctx, pc_jumpto_l2, pc_l2); + duk__patch_jump(comp_ctx, pc_jumpto_l3, pc_l3); + duk__patch_jump(comp_ctx, pc_jumpto_l4, pc_l4); + duk__patch_jump(comp_ctx, pc_jumpto_l5, pc_l5); + duk__patch_jump(comp_ctx, pc_label_site + 1, pc_l5); /* break jump */ + duk__patch_jump(comp_ctx, pc_label_site + 2, pc_l4); /* continue jump */ + } + goto finished; + + finished: + DUK_DDD(DUK_DDDPRINT("end parsing a for/for-in statement")); + return; + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_FOR); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__parse_switch_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site) { + duk_hthread *thr = comp_ctx->thr; + duk_regconst_t temp_at_loop; + duk_regconst_t rc_switch; /* reg/const for switch value */ + duk_regconst_t rc_case; /* reg/const for case value */ + duk_regconst_t reg_temp; /* general temp register */ + duk_int_t pc_prevcase = -1; + duk_int_t pc_prevstmt = -1; + duk_int_t pc_default = -1; /* -1 == not set, -2 == pending (next statement list) */ + + /* Note: negative pc values are ignored when patching jumps, so no explicit checks needed */ + + /* + * Switch is pretty complicated because of several conflicting concerns: + * + * - Want to generate code without an intermediate representation, + * i.e., in one go + * + * - Case selectors are expressions, not values, and may thus e.g. throw + * exceptions (which causes evaluation order concerns) + * + * - Evaluation semantics of case selectors and default clause need to be + * carefully implemented to provide correct behavior even with case value + * side effects + * + * - Fall through case and default clauses; avoiding dead JUMPs if case + * ends with an unconditional jump (a break or a continue) + * + * - The same case value may occur multiple times, but evaluation rules + * only process the first match before switching to a "propagation" mode + * where case values are no longer evaluated + * + * See E5 Section 12.11. Also see doc/compiler.rst for compilation + * discussion. + */ + + duk__advance(comp_ctx); + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + rc_switch = duk__exprtop_toregconst(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* RegExp mode does not matter. */ + duk__advance_expect(comp_ctx, DUK_TOK_LCURLY); + + DUK_DDD(DUK_DDDPRINT("switch value in register %ld", (long) rc_switch)); + + temp_at_loop = DUK__GETTEMP(comp_ctx); + + for (;;) { + duk_int_t num_stmts; + duk_small_uint_t tok; + + /* sufficient for keeping temp reg numbers in check */ + DUK__SETTEMP(comp_ctx, temp_at_loop); + + if (comp_ctx->curr_token.t == DUK_TOK_RCURLY) { + break; + } + + /* + * Parse a case or default clause. + */ + + if (comp_ctx->curr_token.t == DUK_TOK_CASE) { + /* + * Case clause. + * + * Note: cannot use reg_case as a temp register (for SEQ target) + * because it may be a constant. + */ + + duk__patch_jump_here(comp_ctx, pc_prevcase); /* chain jumps for case + * evaluation and checking + */ + + duk__advance(comp_ctx); + rc_case = duk__exprtop_toregconst(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + duk__advance_expect(comp_ctx, DUK_TOK_COLON); + + reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk__emit_a_b_c(comp_ctx, + DUK_OP_SEQ | DUK__EMIT_FLAG_BC_REGCONST, + reg_temp, + rc_switch, + rc_case); + duk__emit_if_true_skip(comp_ctx, reg_temp); + + /* jump to next case clause */ + pc_prevcase = duk__emit_jump_empty(comp_ctx); /* no match, next case */ + + /* statements go here (if any) on next loop */ + } else if (comp_ctx->curr_token.t == DUK_TOK_DEFAULT) { + /* + * Default clause. + */ + + if (pc_default >= 0) { + goto syntax_error; + } + duk__advance(comp_ctx); + duk__advance_expect(comp_ctx, DUK_TOK_COLON); + + /* Fix for https://github.com/svaarala/duktape/issues/155: + * If 'default' is first clause (detected by pc_prevcase < 0) + * we need to ensure we stay in the matching chain. + */ + if (pc_prevcase < 0) { + DUK_DD(DUK_DDPRINT("default clause is first, emit prevcase jump")); + pc_prevcase = duk__emit_jump_empty(comp_ctx); + } + + /* default clause matches next statement list (if any) */ + pc_default = -2; + } else { + /* Code is not accepted before the first case/default clause */ + goto syntax_error; + } + + /* + * Parse code after the clause. Possible terminators are + * 'case', 'default', and '}'. + * + * Note that there may be no code at all, not even an empty statement, + * between case clauses. This must be handled just like an empty statement + * (omitting seemingly pointless JUMPs), to avoid situations like + * test-bug-case-fallthrough.js. + */ + + num_stmts = 0; + if (pc_default == -2) { + pc_default = duk__get_current_pc(comp_ctx); + } + + /* Note: this is correct even for default clause statements: + * they participate in 'fall-through' behavior even if the + * default clause is in the middle. + */ + duk__patch_jump_here(comp_ctx, pc_prevstmt); /* chain jumps for 'fall-through' + * after a case matches. + */ + + for (;;) { + tok = comp_ctx->curr_token.t; + if (tok == DUK_TOK_CASE || tok == DUK_TOK_DEFAULT || + tok == DUK_TOK_RCURLY) { + break; + } + num_stmts++; + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + } + + /* fall-through jump to next code of next case (backpatched) */ + pc_prevstmt = duk__emit_jump_empty(comp_ctx); + + /* XXX: would be nice to omit this jump when the jump is not + * reachable, at least in the obvious cases (such as the case + * ending with a 'break'. + * + * Perhaps duk__parse_stmt() could provide some info on whether + * the statement is a "dead end"? + * + * If implemented, just set pc_prevstmt to -1 when not needed. + */ + } + + DUK_ASSERT(comp_ctx->curr_token.t == DUK_TOK_RCURLY); + comp_ctx->curr_func.allow_regexp_in_adv = 1; + duk__advance(comp_ctx); /* Allow RegExp as part of next stmt. */ + + /* default case control flow patchup; note that if pc_prevcase < 0 + * (i.e. no case clauses), control enters default case automatically. + */ + if (pc_default >= 0) { + /* default case exists: go there if no case matches */ + duk__patch_jump(comp_ctx, pc_prevcase, pc_default); + } else { + /* default case does not exist, or no statements present + * after default case: finish case evaluation + */ + duk__patch_jump_here(comp_ctx, pc_prevcase); + } + + /* fall-through control flow patchup; note that pc_prevstmt may be + * < 0 (i.e. no case clauses), in which case this is a no-op. + */ + duk__patch_jump_here(comp_ctx, pc_prevstmt); + + /* continue jump not patched, an INVALID opcode remains there */ + duk__patch_jump_here(comp_ctx, pc_label_site + 1); /* break jump */ + + /* Note: 'fast' breaks will jump to pc_label_site + 1, which will + * then jump here. The double jump will be eliminated by a + * peephole pass, resulting in an optimal jump here. The label + * site jumps will remain in bytecode and will waste code size. + */ + + return; + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_SWITCH); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__parse_if_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_regconst_t temp_reset; + duk_regconst_t rc_cond; + duk_int_t pc_jump_false; + + DUK_DDD(DUK_DDDPRINT("begin parsing if statement")); + + temp_reset = DUK__GETTEMP(comp_ctx); + + duk__advance(comp_ctx); /* eat 'if' */ + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + + rc_cond = duk__exprtop_toregconst(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + duk__emit_if_true_skip(comp_ctx, rc_cond); + pc_jump_false = duk__emit_jump_empty(comp_ctx); /* jump to end or else part */ + DUK__SETTEMP(comp_ctx, temp_reset); + + comp_ctx->curr_func.allow_regexp_in_adv = 1; + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* Allow RegExp as part of next stmt. */ + + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + + /* The 'else' ambiguity is resolved by 'else' binding to the innermost + * construct, so greedy matching is correct here. + */ + + if (comp_ctx->curr_token.t == DUK_TOK_ELSE) { + duk_int_t pc_jump_end; + + DUK_DDD(DUK_DDDPRINT("if has else part")); + + duk__advance(comp_ctx); + + pc_jump_end = duk__emit_jump_empty(comp_ctx); /* jump from true part to end */ + duk__patch_jump_here(comp_ctx, pc_jump_false); + + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + + duk__patch_jump_here(comp_ctx, pc_jump_end); + } else { + DUK_DDD(DUK_DDDPRINT("if does not have else part")); + + duk__patch_jump_here(comp_ctx, pc_jump_false); + } + + DUK_DDD(DUK_DDDPRINT("end parsing if statement")); +} + +DUK_LOCAL void duk__parse_do_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site) { + duk_regconst_t rc_cond; + duk_int_t pc_start; + + DUK_DDD(DUK_DDDPRINT("begin parsing do statement")); + + duk__advance(comp_ctx); /* Eat 'do'; allow RegExp as part of next stmt. */ + + pc_start = duk__get_current_pc(comp_ctx); + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + duk__patch_jump_here(comp_ctx, pc_label_site + 2); /* continue jump */ + + duk__advance_expect(comp_ctx, DUK_TOK_WHILE); + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + + rc_cond = duk__exprtop_toregconst(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + duk__emit_if_false_skip(comp_ctx, rc_cond); + duk__emit_jump(comp_ctx, pc_start); + /* no need to reset temps, as we're finished emitting code */ + + comp_ctx->curr_func.allow_regexp_in_adv = 1; /* Allow RegExp as part of next stmt. */ + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); + + duk__patch_jump_here(comp_ctx, pc_label_site + 1); /* break jump */ + + DUK_DDD(DUK_DDDPRINT("end parsing do statement")); +} + +DUK_LOCAL void duk__parse_while_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_int_t pc_label_site) { + duk_regconst_t temp_reset; + duk_regconst_t rc_cond; + duk_int_t pc_start; + duk_int_t pc_jump_false; + + DUK_DDD(DUK_DDDPRINT("begin parsing while statement")); + + temp_reset = DUK__GETTEMP(comp_ctx); + + duk__advance(comp_ctx); /* eat 'while' */ + + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + + pc_start = duk__get_current_pc(comp_ctx); + duk__patch_jump_here(comp_ctx, pc_label_site + 2); /* continue jump */ + + rc_cond = duk__exprtop_toregconst(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + duk__emit_if_true_skip(comp_ctx, rc_cond); + pc_jump_false = duk__emit_jump_empty(comp_ctx); + DUK__SETTEMP(comp_ctx, temp_reset); + + comp_ctx->curr_func.allow_regexp_in_adv = 1; + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* Allow RegExp as part of next stmt. */ + + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + duk__emit_jump(comp_ctx, pc_start); + + duk__patch_jump_here(comp_ctx, pc_jump_false); + duk__patch_jump_here(comp_ctx, pc_label_site + 1); /* break jump */ + + DUK_DDD(DUK_DDDPRINT("end parsing while statement")); +} + +DUK_LOCAL void duk__parse_break_or_continue_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk_bool_t is_break = (comp_ctx->curr_token.t == DUK_TOK_BREAK); + duk_int_t label_id; + duk_int_t label_catch_depth; + duk_int_t label_pc; /* points to LABEL; pc+1 = jump site for break; pc+2 = jump site for continue */ + duk_bool_t label_is_closest; + + DUK_UNREF(res); + + duk__advance(comp_ctx); /* eat 'break' or 'continue' */ + + if (comp_ctx->curr_token.t == DUK_TOK_SEMICOLON || /* explicit semi follows */ + comp_ctx->curr_token.lineterm || /* automatic semi will be inserted */ + comp_ctx->curr_token.allow_auto_semi) { /* automatic semi will be inserted */ + /* break/continue without label */ + + duk__lookup_active_label(comp_ctx, DUK_HTHREAD_STRING_EMPTY_STRING(thr), is_break, &label_id, &label_catch_depth, &label_pc, &label_is_closest); + } else if (comp_ctx->curr_token.t == DUK_TOK_IDENTIFIER) { + /* break/continue with label (label cannot be a reserved word, production is 'Identifier' */ + DUK_ASSERT(comp_ctx->curr_token.str1 != NULL); + duk__lookup_active_label(comp_ctx, comp_ctx->curr_token.str1, is_break, &label_id, &label_catch_depth, &label_pc, &label_is_closest); + duk__advance(comp_ctx); + } else { + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_BREAK_CONT_LABEL); + DUK_WO_NORETURN(return;); + } + + /* Use a fast break/continue when possible. A fast break/continue is + * just a jump to the LABEL break/continue jump slot, which then jumps + * to an appropriate place (for break, going through ENDLABEL correctly). + * The peephole optimizer will optimize the jump to a direct one. + */ + + if (label_catch_depth == comp_ctx->curr_func.catch_depth && + label_is_closest) { + DUK_DDD(DUK_DDDPRINT("break/continue: is_break=%ld, label_id=%ld, label_is_closest=%ld, " + "label_catch_depth=%ld, catch_depth=%ld " + "-> use fast variant (direct jump)", + (long) is_break, (long) label_id, (long) label_is_closest, + (long) label_catch_depth, (long) comp_ctx->curr_func.catch_depth)); + + duk__emit_jump(comp_ctx, label_pc + (is_break ? 1 : 2)); + } else { + DUK_DDD(DUK_DDDPRINT("break/continue: is_break=%ld, label_id=%ld, label_is_closest=%ld, " + "label_catch_depth=%ld, catch_depth=%ld " + "-> use slow variant (longjmp)", + (long) is_break, (long) label_id, (long) label_is_closest, + (long) label_catch_depth, (long) comp_ctx->curr_func.catch_depth)); + + duk__emit_bc(comp_ctx, + is_break ? DUK_OP_BREAK : DUK_OP_CONTINUE, + (duk_regconst_t) label_id); + } +} + +DUK_LOCAL void duk__parse_return_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk_regconst_t rc_val; + + duk__advance(comp_ctx); /* eat 'return' */ + + /* A 'return' statement is only allowed inside an actual function body, + * not as part of eval or global code. + */ + if (!comp_ctx->curr_func.is_function) { + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_RETURN); + DUK_WO_NORETURN(return;); + } + + if (comp_ctx->curr_token.t == DUK_TOK_SEMICOLON || /* explicit semi follows */ + comp_ctx->curr_token.lineterm || /* automatic semi will be inserted */ + comp_ctx->curr_token.allow_auto_semi) { /* automatic semi will be inserted */ + DUK_DDD(DUK_DDDPRINT("empty return value -> undefined")); + duk__emit_op_only(comp_ctx, DUK_OP_RETUNDEF); + } else { + duk_int_t pc_before_expr; + duk_int_t pc_after_expr; + + DUK_DDD(DUK_DDDPRINT("return with a value")); + + DUK_UNREF(pc_before_expr); + DUK_UNREF(pc_after_expr); + + pc_before_expr = duk__get_current_pc(comp_ctx); + rc_val = duk__exprtop_toregconst(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + pc_after_expr = duk__get_current_pc(comp_ctx); + + /* Tail call check: if last opcode emitted was CALL, and + * the context allows it, add a tailcall flag to the CALL. + * This doesn't guarantee that a tail call will be allowed at + * runtime, so the RETURN must still be emitted. (Duktape + * 0.10.0 avoided this and simulated a RETURN if a tail call + * couldn't be used at runtime; but this didn't work + * correctly with a thread yield/resume, see + * test-bug-tailcall-thread-yield-resume.js for discussion.) + * + * In addition to the last opcode being CALL, we also need to + * be sure that 'rc_val' is the result register of the CALL. + * For instance, for the expression 'return 0, (function () + * { return 1; }), 2' the last opcode emitted is CALL (no + * bytecode is emitted for '2') but 'rc_val' indicates + * constant '2'. Similarly if '2' is replaced by a register + * bound variable, no opcodes are emitted but tail call would + * be incorrect. + * + * This is tricky and easy to get wrong. It would be best to + * track enough expression metadata to check that 'rc_val' came + * from that last CALL instruction. We don't have that metadata + * now, so we check that 'rc_val' is a temporary register result + * (not a constant or a register bound variable). There should + * be no way currently for 'rc_val' to be a temporary for an + * expression following the CALL instruction without emitting + * some opcodes following the CALL. This proxy check is used + * below. + * + * See: test-bug-comma-expr-gh131.js. + * + * The non-standard 'caller' property disables tail calls + * because they pose some special cases which haven't been + * fixed yet. + */ + +#if defined(DUK_USE_TAILCALL) + if (comp_ctx->curr_func.catch_depth == 0 && /* no catchers */ + pc_after_expr > pc_before_expr) { /* at least one opcode emitted */ + duk_compiler_instr *instr; + duk_instr_t ins; + duk_small_uint_t op; + + instr = duk__get_instr_ptr(comp_ctx, pc_after_expr - 1); + DUK_ASSERT(instr != NULL); + + ins = instr->ins; + op = (duk_small_uint_t) DUK_DEC_OP(ins); + if ((op & ~0x0fU) == DUK_OP_CALL0 && + DUK__ISREG_TEMP(comp_ctx, rc_val) /* see above */) { + DUK_DDD(DUK_DDDPRINT("return statement detected a tail call opportunity: " + "catch depth is 0, duk__exprtop() emitted >= 1 instructions, " + "and last instruction is a CALL " + "-> change to TAILCALL")); + ins |= DUK_ENC_OP(DUK_BC_CALL_FLAG_TAILCALL); + instr->ins = ins; + } + } +#endif /* DUK_USE_TAILCALL */ + + if (DUK__ISREG(rc_val)) { + duk__emit_bc(comp_ctx, DUK_OP_RETREG, rc_val); + } else { + rc_val = DUK__REMOVECONST(rc_val); + if (duk__const_needs_refcount(comp_ctx, rc_val)) { + duk__emit_bc(comp_ctx, DUK_OP_RETCONST, rc_val); + } else { + duk__emit_bc(comp_ctx, DUK_OP_RETCONSTN, rc_val); + } + } + } +} + +DUK_LOCAL void duk__parse_throw_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_regconst_t reg_val; + + duk__advance(comp_ctx); /* eat 'throw' */ + + /* Unlike break/continue, throw statement does not allow an empty value. */ + + if (comp_ctx->curr_token.lineterm) { + DUK_ERROR_SYNTAX(comp_ctx->thr, DUK_STR_INVALID_THROW); + DUK_WO_NORETURN(return;); + } + + reg_val = duk__exprtop_toreg(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + duk__emit_bc(comp_ctx, + DUK_OP_THROW, + reg_val); +} + +DUK_LOCAL void duk__parse_try_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_hthread *thr = comp_ctx->thr; + duk_regconst_t reg_catch; /* reg_catch+0 and reg_catch+1 are reserved for TRYCATCH */ + duk_regconst_t rc_varname = 0; + duk_small_uint_t trycatch_flags = 0; + duk_int_t pc_ldconst = -1; + duk_int_t pc_trycatch = -1; + duk_int_t pc_catch = -1; + duk_int_t pc_finally = -1; + + DUK_UNREF(res); + + /* + * See the following documentation for discussion: + * + * doc/execution.rst: control flow details + * + * Try, catch, and finally "parts" are Blocks, not Statements, so + * they must always be delimited by curly braces. This is unlike e.g. + * the if statement, which accepts any Statement. This eliminates any + * questions of matching parts of nested try statements. The Block + * parsing is implemented inline here (instead of calling out). + * + * Finally part has a 'let scoped' variable, which requires a few kinks + * here. + */ + + comp_ctx->curr_func.catch_depth++; + + duk__advance(comp_ctx); /* eat 'try' */ + + reg_catch = DUK__ALLOCTEMPS(comp_ctx, 2); + + /* The target for this LDCONST may need output shuffling, but we assume + * that 'pc_ldconst' will be the LDCONST that we can patch later. This + * should be the case because there's no input shuffling. (If there's + * no catch clause, this LDCONST will be replaced with a NOP.) + */ + pc_ldconst = duk__get_current_pc(comp_ctx); + duk__emit_a_bc(comp_ctx, DUK_OP_LDCONST, reg_catch, 0 /*patched later*/); + + pc_trycatch = duk__get_current_pc(comp_ctx); + duk__emit_invalid(comp_ctx); /* TRYCATCH, cannot emit now (not enough info) */ + duk__emit_invalid(comp_ctx); /* jump for 'catch' case */ + duk__emit_invalid(comp_ctx); /* jump for 'finally' case or end (if no finally) */ + + /* try part */ + duk__advance_expect(comp_ctx, DUK_TOK_LCURLY); + duk__parse_stmts(comp_ctx, 0 /*allow_source_elem*/, 0 /*expect_eof*/, 1 /*regexp_after*/); + /* the DUK_TOK_RCURLY is eaten by duk__parse_stmts() */ + duk__emit_op_only(comp_ctx, DUK_OP_ENDTRY); + + if (comp_ctx->curr_token.t == DUK_TOK_CATCH) { + /* + * The catch variable must be updated to reflect the new allocated + * register for the duration of the catch clause. We need to store + * and restore the original value for the varmap entry (if any). + */ + + /* + * Note: currently register bindings must be fixed for the entire + * function. So, even though the catch variable is in a register + * we know, we must use an explicit environment record and slow path + * accesses to read/write the catch binding to make closures created + * within the catch clause work correctly. This restriction should + * be fixable (at least in common cases) later. + * + * See: test-bug-catch-binding-2.js. + * + * XXX: improve to get fast path access to most catch clauses. + */ + + duk_hstring *h_var; + duk_int_t varmap_value; /* for storing/restoring the varmap binding for catch variable */ + + DUK_DDD(DUK_DDDPRINT("stack top at start of catch clause: %ld", (long) duk_get_top(thr))); + + trycatch_flags |= DUK_BC_TRYCATCH_FLAG_HAVE_CATCH; + + pc_catch = duk__get_current_pc(comp_ctx); + + duk__advance(comp_ctx); + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + + if (comp_ctx->curr_token.t != DUK_TOK_IDENTIFIER) { + /* Identifier, i.e. don't allow reserved words */ + goto syntax_error; + } + h_var = comp_ctx->curr_token.str1; + DUK_ASSERT(h_var != NULL); + + duk_push_hstring(thr, h_var); /* keep in on valstack, use borrowed ref below */ + + if (comp_ctx->curr_func.is_strict && + ((h_var == DUK_HTHREAD_STRING_EVAL(thr)) || + (h_var == DUK_HTHREAD_STRING_LC_ARGUMENTS(thr)))) { + DUK_DDD(DUK_DDDPRINT("catch identifier 'eval' or 'arguments' in strict mode -> SyntaxError")); + goto syntax_error; + } + + duk_dup_top(thr); + rc_varname = duk__getconst(comp_ctx); + DUK_DDD(DUK_DDDPRINT("catch clause, rc_varname=0x%08lx (%ld)", + (unsigned long) rc_varname, (long) rc_varname)); + + duk__advance(comp_ctx); + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); + + duk__advance_expect(comp_ctx, DUK_TOK_LCURLY); + + DUK_DDD(DUK_DDDPRINT("varmap before modifying for catch clause: %!iT", + (duk_tval *) duk_get_tval(thr, comp_ctx->curr_func.varmap_idx))); + + duk_dup_top(thr); + duk_get_prop(thr, comp_ctx->curr_func.varmap_idx); + if (duk_is_undefined(thr, -1)) { + varmap_value = -2; + } else if (duk_is_null(thr, -1)) { + varmap_value = -1; + } else { + DUK_ASSERT(duk_is_number(thr, -1)); + varmap_value = duk_get_int(thr, -1); + DUK_ASSERT(varmap_value >= 0); + } + duk_pop(thr); + +#if 0 + /* It'd be nice to do something like this - but it doesn't + * work for closures created inside the catch clause. + */ + duk_dup_top(thr); + duk_push_int(thr, (duk_int_t) (reg_catch + 0)); + duk_put_prop(thr, comp_ctx->curr_func.varmap_idx); +#endif + duk_dup_top(thr); + duk_push_null(thr); + duk_put_prop(thr, comp_ctx->curr_func.varmap_idx); + + duk__emit_a_bc(comp_ctx, + DUK_OP_PUTVAR | DUK__EMIT_FLAG_A_IS_SOURCE, + reg_catch + 0 /*value*/, + rc_varname /*varname*/); + + DUK_DDD(DUK_DDDPRINT("varmap before parsing catch clause: %!iT", + (duk_tval *) duk_get_tval(thr, comp_ctx->curr_func.varmap_idx))); + + duk__parse_stmts(comp_ctx, 0 /*allow_source_elem*/, 0 /*expect_eof*/, 1 /*regexp_after*/); + /* the DUK_TOK_RCURLY is eaten by duk__parse_stmts() */ + + if (varmap_value == -2) { + /* not present */ + duk_del_prop(thr, comp_ctx->curr_func.varmap_idx); + } else { + if (varmap_value == -1) { + duk_push_null(thr); + } else { + DUK_ASSERT(varmap_value >= 0); + duk_push_int(thr, varmap_value); + } + duk_put_prop(thr, comp_ctx->curr_func.varmap_idx); + } + /* varname is popped by above code */ + + DUK_DDD(DUK_DDDPRINT("varmap after restore catch clause: %!iT", + (duk_tval *) duk_get_tval(thr, comp_ctx->curr_func.varmap_idx))); + + duk__emit_op_only(comp_ctx, + DUK_OP_ENDCATCH); + + /* + * XXX: for now, indicate that an expensive catch binding + * declarative environment is always needed. If we don't + * need it, we don't need the const_varname either. + */ + + trycatch_flags |= DUK_BC_TRYCATCH_FLAG_CATCH_BINDING; + + DUK_DDD(DUK_DDDPRINT("stack top at end of catch clause: %ld", (long) duk_get_top(thr))); + } + + if (comp_ctx->curr_token.t == DUK_TOK_FINALLY) { + trycatch_flags |= DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY; + + pc_finally = duk__get_current_pc(comp_ctx); + + duk__advance(comp_ctx); + + duk__advance_expect(comp_ctx, DUK_TOK_LCURLY); + duk__parse_stmts(comp_ctx, 0 /*allow_source_elem*/, 0 /*expect_eof*/, 1 /*regexp_after*/); + /* the DUK_TOK_RCURLY is eaten by duk__parse_stmts() */ + duk__emit_abc(comp_ctx, + DUK_OP_ENDFIN, + reg_catch); /* rethrow */ + } + + if (!(trycatch_flags & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH) && + !(trycatch_flags & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY)) { + /* must have catch and/or finally */ + goto syntax_error; + } + + /* If there's no catch block, rc_varname will be 0 and duk__patch_trycatch() + * will replace the LDCONST with a NOP. For any actual constant (including + * constant 0) the DUK__CONST_MARKER flag will be set in rc_varname. + */ + + duk__patch_trycatch(comp_ctx, + pc_ldconst, + pc_trycatch, + reg_catch, + rc_varname, + trycatch_flags); + + if (trycatch_flags & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH) { + DUK_ASSERT(pc_catch >= 0); + duk__patch_jump(comp_ctx, pc_trycatch + 1, pc_catch); + } + + if (trycatch_flags & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY) { + DUK_ASSERT(pc_finally >= 0); + duk__patch_jump(comp_ctx, pc_trycatch + 2, pc_finally); + } else { + /* without finally, the second jump slot is used to jump to end of stmt */ + duk__patch_jump_here(comp_ctx, pc_trycatch + 2); + } + + comp_ctx->curr_func.catch_depth--; + return; + + syntax_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_TRY); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__parse_with_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res) { + duk_int_t pc_trycatch; + duk_int_t pc_finished; + duk_regconst_t reg_catch; + duk_small_uint_t trycatch_flags; + + if (comp_ctx->curr_func.is_strict) { + DUK_ERROR_SYNTAX(comp_ctx->thr, DUK_STR_WITH_IN_STRICT_MODE); + DUK_WO_NORETURN(return;); + } + + comp_ctx->curr_func.catch_depth++; + + duk__advance(comp_ctx); /* eat 'with' */ + + reg_catch = DUK__ALLOCTEMPS(comp_ctx, 2); + + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + duk__exprtop_toforcedreg(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/, reg_catch); + comp_ctx->curr_func.allow_regexp_in_adv = 1; + duk__advance_expect(comp_ctx, DUK_TOK_RPAREN); /* Allow RegExp as part of next stmt. */ + + pc_trycatch = duk__get_current_pc(comp_ctx); + trycatch_flags = DUK_BC_TRYCATCH_FLAG_WITH_BINDING; + duk__emit_a_bc(comp_ctx, + DUK_OP_TRYCATCH | DUK__EMIT_FLAG_NO_SHUFFLE_A, + (duk_regconst_t) trycatch_flags /*a*/, + reg_catch /*bc*/); + duk__emit_invalid(comp_ctx); /* catch jump */ + duk__emit_invalid(comp_ctx); /* finished jump */ + + duk__parse_stmt(comp_ctx, res, 0 /*allow_source_elem*/); + duk__emit_op_only(comp_ctx, DUK_OP_ENDTRY); + + pc_finished = duk__get_current_pc(comp_ctx); + + duk__patch_jump(comp_ctx, pc_trycatch + 2, pc_finished); + + comp_ctx->curr_func.catch_depth--; +} + +DUK_LOCAL duk_int_t duk__stmt_label_site(duk_compiler_ctx *comp_ctx, duk_int_t label_id) { + /* if a site already exists, nop: max one label site per statement */ + if (label_id >= 0) { + return label_id; + } + + label_id = comp_ctx->curr_func.label_next++; + DUK_DDD(DUK_DDDPRINT("allocated new label id for label site: %ld", (long) label_id)); + + duk__emit_bc(comp_ctx, + DUK_OP_LABEL, + (duk_regconst_t) label_id); + duk__emit_invalid(comp_ctx); + duk__emit_invalid(comp_ctx); + + return label_id; +} + +/* Parse a single statement. + * + * Creates a label site (with an empty label) automatically for iteration + * statements. Also "peels off" any label statements for explicit labels. + */ +DUK_LOCAL void duk__parse_stmt(duk_compiler_ctx *comp_ctx, duk_ivalue *res, duk_bool_t allow_source_elem) { + duk_hthread *thr = comp_ctx->thr; + duk_bool_t dir_prol_at_entry; /* directive prologue status at entry */ + duk_regconst_t temp_at_entry; + duk_size_t labels_len_at_entry; + duk_int_t pc_at_entry; /* assumed to also be PC of "LABEL" */ + duk_int_t stmt_id; + duk_small_uint_t stmt_flags = 0; + duk_int_t label_id = -1; + duk_small_uint_t tok; + duk_bool_t test_func_decl; + + DUK__RECURSION_INCREASE(comp_ctx, thr); + + temp_at_entry = DUK__GETTEMP(comp_ctx); + pc_at_entry = duk__get_current_pc(comp_ctx); + labels_len_at_entry = duk_get_length(thr, comp_ctx->curr_func.labelnames_idx); + stmt_id = comp_ctx->curr_func.stmt_next++; + dir_prol_at_entry = comp_ctx->curr_func.in_directive_prologue; + + DUK_UNREF(stmt_id); + + DUK_DDD(DUK_DDDPRINT("parsing a statement, stmt_id=%ld, temp_at_entry=%ld, labels_len_at_entry=%ld, " + "is_strict=%ld, in_directive_prologue=%ld, catch_depth=%ld", + (long) stmt_id, (long) temp_at_entry, (long) labels_len_at_entry, + (long) comp_ctx->curr_func.is_strict, (long) comp_ctx->curr_func.in_directive_prologue, + (long) comp_ctx->curr_func.catch_depth)); + + /* The directive prologue flag is cleared by default so that it is + * unset for any recursive statement parsing. It is only "revived" + * if a directive is detected. (We could also make directives only + * allowed if 'allow_source_elem' was true.) + */ + comp_ctx->curr_func.in_directive_prologue = 0; + + retry_parse: + + DUK_DDD(DUK_DDDPRINT("try stmt parse, stmt_id=%ld, label_id=%ld, allow_source_elem=%ld, catch_depth=%ld", + (long) stmt_id, (long) label_id, (long) allow_source_elem, + (long) comp_ctx->curr_func.catch_depth)); + + /* + * Detect iteration statements; if encountered, establish an + * empty label. + */ + + tok = comp_ctx->curr_token.t; + if (tok == DUK_TOK_FOR || tok == DUK_TOK_DO || tok == DUK_TOK_WHILE || + tok == DUK_TOK_SWITCH) { + DUK_DDD(DUK_DDDPRINT("iteration/switch statement -> add empty label")); + + label_id = duk__stmt_label_site(comp_ctx, label_id); + duk__add_label(comp_ctx, + DUK_HTHREAD_STRING_EMPTY_STRING(thr), + pc_at_entry /*pc_label*/, + label_id); + } + + /* + * Main switch for statement / source element type. + */ + + switch (comp_ctx->curr_token.t) { + case DUK_TOK_FUNCTION: { + /* + * Function declaration, function expression, or (non-standard) + * function statement. + * + * The E5 specification only allows function declarations at + * the top level (in "source elements"). An ExpressionStatement + * is explicitly not allowed to begin with a "function" keyword + * (E5 Section 12.4). Hence any non-error semantics for such + * non-top-level statements are non-standard. Duktape semantics + * for function statements are modelled after V8, see + * test-dev-func-decl-outside-top.js. + */ + test_func_decl = allow_source_elem; +#if defined(DUK_USE_NONSTD_FUNC_STMT) + /* Lenient: allow function declarations outside top level in + * non-strict mode but reject them in strict mode. + */ + test_func_decl = test_func_decl || !comp_ctx->curr_func.is_strict; +#endif /* DUK_USE_NONSTD_FUNC_STMT */ + /* Strict: never allow function declarations outside top level. */ + if (test_func_decl) { + /* FunctionDeclaration: not strictly a statement but handled as such. + * + * O(depth^2) parse count for inner functions is handled by recording a + * lexer offset on the first compilation pass, so that the function can + * be efficiently skipped on the second pass. This is encapsulated into + * duk__parse_func_like_fnum(). + */ + + duk_int_t fnum; +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t top_before; +#endif + + DUK_DDD(DUK_DDDPRINT("function declaration statement")); + +#if defined(DUK_USE_ASSERTIONS) + top_before = duk_get_top(thr); +#endif + + duk__advance(comp_ctx); /* eat 'function' */ + fnum = duk__parse_func_like_fnum(comp_ctx, DUK__FUNC_FLAG_DECL | DUK__FUNC_FLAG_PUSHNAME_PASS1); + + /* The value stack convention here is a bit odd: the function + * name is only pushed on pass 1 (in_scanning), and is needed + * to process function declarations. + */ + if (comp_ctx->curr_func.in_scanning) { + duk_uarridx_t n; + +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(duk_get_top(thr) == top_before + 1); +#endif + DUK_DDD(DUK_DDDPRINT("register function declaration %!T in pass 1, fnum %ld", + duk_get_tval(thr, -1), (long) fnum)); + n = (duk_uarridx_t) duk_get_length(thr, comp_ctx->curr_func.decls_idx); + /* funcname is at index -1 */ + duk_put_prop_index(thr, comp_ctx->curr_func.decls_idx, n); + duk_push_int(thr, (duk_int_t) (DUK_DECL_TYPE_FUNC + (fnum << 8))); + duk_put_prop_index(thr, comp_ctx->curr_func.decls_idx, n + 1); + } else { +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(duk_get_top(thr) == top_before); +#endif + } + + /* no statement value (unlike function expression) */ + stmt_flags = 0; + break; + } else { + DUK_ERROR_SYNTAX(thr, DUK_STR_FUNC_STMT_NOT_ALLOWED); + DUK_WO_NORETURN(return;); + } + break; + } + case DUK_TOK_LCURLY: { + DUK_DDD(DUK_DDDPRINT("block statement")); + duk__advance(comp_ctx); + duk__parse_stmts(comp_ctx, 0 /*allow_source_elem*/, 0 /*expect_eof*/, 1 /*regexp_after*/); + /* the DUK_TOK_RCURLY is eaten by duk__parse_stmts() */ + if (label_id >= 0) { + duk__patch_jump_here(comp_ctx, pc_at_entry + 1); /* break jump */ + } + stmt_flags = 0; + break; + } + case DUK_TOK_CONST: { + DUK_DDD(DUK_DDDPRINT("constant declaration statement")); + duk__parse_var_stmt(comp_ctx, res, DUK__EXPR_FLAG_REQUIRE_INIT /*expr_flags*/); + stmt_flags = DUK__HAS_TERM; + break; + } + case DUK_TOK_VAR: { + DUK_DDD(DUK_DDDPRINT("variable declaration statement")); + duk__parse_var_stmt(comp_ctx, res, 0 /*expr_flags*/); + stmt_flags = DUK__HAS_TERM; + break; + } + case DUK_TOK_SEMICOLON: { + /* empty statement with an explicit semicolon */ + DUK_DDD(DUK_DDDPRINT("empty statement")); + stmt_flags = DUK__HAS_TERM; + break; + } + case DUK_TOK_IF: { + DUK_DDD(DUK_DDDPRINT("if statement")); + duk__parse_if_stmt(comp_ctx, res); + if (label_id >= 0) { + duk__patch_jump_here(comp_ctx, pc_at_entry + 1); /* break jump */ + } + stmt_flags = 0; + break; + } + case DUK_TOK_DO: { + /* + * Do-while statement is mostly trivial, but there is special + * handling for automatic semicolon handling (triggered by the + * DUK__ALLOW_AUTO_SEMI_ALWAYS) flag related to a bug filed at: + * + * https://bugs.ecmascript.org/show_bug.cgi?id=8 + * + * See doc/compiler.rst for details. + */ + DUK_DDD(DUK_DDDPRINT("do statement")); + DUK_ASSERT(label_id >= 0); + duk__update_label_flags(comp_ctx, + label_id, + DUK_LABEL_FLAG_ALLOW_BREAK | DUK_LABEL_FLAG_ALLOW_CONTINUE); + duk__parse_do_stmt(comp_ctx, res, pc_at_entry); + stmt_flags = DUK__HAS_TERM | DUK__ALLOW_AUTO_SEMI_ALWAYS; /* DUK__ALLOW_AUTO_SEMI_ALWAYS workaround */ + break; + } + case DUK_TOK_WHILE: { + DUK_DDD(DUK_DDDPRINT("while statement")); + DUK_ASSERT(label_id >= 0); + duk__update_label_flags(comp_ctx, + label_id, + DUK_LABEL_FLAG_ALLOW_BREAK | DUK_LABEL_FLAG_ALLOW_CONTINUE); + duk__parse_while_stmt(comp_ctx, res, pc_at_entry); + stmt_flags = 0; + break; + } + case DUK_TOK_FOR: { + /* + * For/for-in statement is complicated to parse because + * determining the statement type (three-part for vs. a + * for-in) requires potential backtracking. + * + * See the helper for the messy stuff. + */ + DUK_DDD(DUK_DDDPRINT("for/for-in statement")); + DUK_ASSERT(label_id >= 0); + duk__update_label_flags(comp_ctx, + label_id, + DUK_LABEL_FLAG_ALLOW_BREAK | DUK_LABEL_FLAG_ALLOW_CONTINUE); + duk__parse_for_stmt(comp_ctx, res, pc_at_entry); + stmt_flags = 0; + break; + } + case DUK_TOK_CONTINUE: + case DUK_TOK_BREAK: { + DUK_DDD(DUK_DDDPRINT("break/continue statement")); + duk__parse_break_or_continue_stmt(comp_ctx, res); + stmt_flags = DUK__HAS_TERM | DUK__IS_TERMINAL; + break; + } + case DUK_TOK_RETURN: { + DUK_DDD(DUK_DDDPRINT("return statement")); + duk__parse_return_stmt(comp_ctx, res); + stmt_flags = DUK__HAS_TERM | DUK__IS_TERMINAL; + break; + } + case DUK_TOK_WITH: { + DUK_DDD(DUK_DDDPRINT("with statement")); + comp_ctx->curr_func.with_depth++; + duk__parse_with_stmt(comp_ctx, res); + if (label_id >= 0) { + duk__patch_jump_here(comp_ctx, pc_at_entry + 1); /* break jump */ + } + comp_ctx->curr_func.with_depth--; + stmt_flags = 0; + break; + } + case DUK_TOK_SWITCH: { + /* + * The switch statement is pretty messy to compile. + * See the helper for details. + */ + DUK_DDD(DUK_DDDPRINT("switch statement")); + DUK_ASSERT(label_id >= 0); + duk__update_label_flags(comp_ctx, + label_id, + DUK_LABEL_FLAG_ALLOW_BREAK); /* don't allow continue */ + duk__parse_switch_stmt(comp_ctx, res, pc_at_entry); + stmt_flags = 0; + break; + } + case DUK_TOK_THROW: { + DUK_DDD(DUK_DDDPRINT("throw statement")); + duk__parse_throw_stmt(comp_ctx, res); + stmt_flags = DUK__HAS_TERM | DUK__IS_TERMINAL; + break; + } + case DUK_TOK_TRY: { + DUK_DDD(DUK_DDDPRINT("try statement")); + duk__parse_try_stmt(comp_ctx, res); + stmt_flags = 0; + break; + } + case DUK_TOK_DEBUGGER: { + duk__advance(comp_ctx); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + DUK_DDD(DUK_DDDPRINT("debugger statement: debugging enabled, emit debugger opcode")); + duk__emit_op_only(comp_ctx, DUK_OP_DEBUGGER); +#else + DUK_DDD(DUK_DDDPRINT("debugger statement: ignored")); +#endif + stmt_flags = DUK__HAS_TERM; + break; + } + default: { + /* + * Else, must be one of: + * - ExpressionStatement, possibly a directive (String) + * - LabelledStatement (Identifier followed by ':') + * + * Expressions beginning with 'function' keyword are covered by a case + * above (such expressions are not allowed in standard E5 anyway). + * Also expressions starting with '{' are interpreted as block + * statements. See E5 Section 12.4. + * + * Directive detection is tricky; see E5 Section 14.1 on directive + * prologue. A directive is an expression statement with a single + * string literal and an explicit or automatic semicolon. Escape + * characters are significant and no parens etc are allowed: + * + * 'use strict'; // valid 'use strict' directive + * 'use\u0020strict'; // valid directive, not a 'use strict' directive + * ('use strict'); // not a valid directive + * + * The expression is determined to consist of a single string literal + * based on duk__expr_nud() and duk__expr_led() call counts. The string literal + * of a 'use strict' directive is determined to lack any escapes based + * num_escapes count from the lexer. Note that other directives may be + * allowed to contain escapes, so a directive with escapes does not + * terminate a directive prologue. + * + * We rely on the fact that the expression parser will not emit any + * code for a single token expression. However, it will generate an + * intermediate value which we will then successfully ignore. + * + * A similar approach is used for labels. + */ + + duk_bool_t single_token; + + DUK_DDD(DUK_DDDPRINT("expression statement")); + duk__exprtop(comp_ctx, res, DUK__BP_FOR_EXPR /*rbp_flags*/); + + single_token = (comp_ctx->curr_func.nud_count == 1 && /* one token */ + comp_ctx->curr_func.led_count == 0); /* no operators */ + + if (single_token && + comp_ctx->prev_token.t == DUK_TOK_IDENTIFIER && + comp_ctx->curr_token.t == DUK_TOK_COLON) { + /* + * Detected label + */ + + duk_hstring *h_lab; + + /* expected ival */ + DUK_ASSERT(res->t == DUK_IVAL_VAR); + DUK_ASSERT(res->x1.t == DUK_ISPEC_VALUE); + DUK_ASSERT(DUK_TVAL_IS_STRING(duk_get_tval(thr, res->x1.valstack_idx))); + h_lab = comp_ctx->prev_token.str1; + DUK_ASSERT(h_lab != NULL); + + DUK_DDD(DUK_DDDPRINT("explicit label site for label '%!O'", + (duk_heaphdr *) h_lab)); + + duk__advance(comp_ctx); /* eat colon */ + + label_id = duk__stmt_label_site(comp_ctx, label_id); + + duk__add_label(comp_ctx, + h_lab, + pc_at_entry /*pc_label*/, + label_id); + + /* a statement following a label cannot be a source element + * (a function declaration). + */ + allow_source_elem = 0; + + DUK_DDD(DUK_DDDPRINT("label handled, retry statement parsing")); + goto retry_parse; + } + + stmt_flags = 0; + + if (dir_prol_at_entry && /* still in prologue */ + single_token && /* single string token */ + comp_ctx->prev_token.t == DUK_TOK_STRING) { + /* + * Detected a directive + */ + duk_hstring *h_dir; + + /* expected ival */ + DUK_ASSERT(res->t == DUK_IVAL_PLAIN); + DUK_ASSERT(res->x1.t == DUK_ISPEC_VALUE); + DUK_ASSERT(DUK_TVAL_IS_STRING(duk_get_tval(thr, res->x1.valstack_idx))); + h_dir = comp_ctx->prev_token.str1; + DUK_ASSERT(h_dir != NULL); + + DUK_DDD(DUK_DDDPRINT("potential directive: %!O", h_dir)); + + stmt_flags |= DUK__STILL_PROLOGUE; + + /* Note: escaped characters differentiate directives */ + + if (comp_ctx->prev_token.num_escapes > 0) { + DUK_DDD(DUK_DDDPRINT("directive contains escapes: valid directive " + "but we ignore such directives")); + } else { + /* + * The length comparisons are present to handle + * strings like "use strict\u0000foo" as required. + */ + + if (DUK_HSTRING_GET_BYTELEN(h_dir) == 10 && + DUK_STRCMP((const char *) DUK_HSTRING_GET_DATA(h_dir), "use strict") == 0) { +#if defined(DUK_USE_STRICT_DECL) + DUK_DDD(DUK_DDDPRINT("use strict directive detected: strict flag %ld -> %ld", + (long) comp_ctx->curr_func.is_strict, (long) 1)); + comp_ctx->curr_func.is_strict = 1; +#else + DUK_DDD(DUK_DDDPRINT("use strict detected but strict declarations disabled, ignoring")); +#endif + } else if (DUK_HSTRING_GET_BYTELEN(h_dir) == 14 && + DUK_STRCMP((const char *) DUK_HSTRING_GET_DATA(h_dir), "use duk notail") == 0) { + DUK_DDD(DUK_DDDPRINT("use duk notail directive detected: notail flag %ld -> %ld", + (long) comp_ctx->curr_func.is_notail, (long) 1)); + comp_ctx->curr_func.is_notail = 1; + } else { + DUK_DD(DUK_DDPRINT("unknown directive: '%!O', ignoring but not terminating " + "directive prologue", (duk_hobject *) h_dir)); + } + } + } else { + DUK_DDD(DUK_DDDPRINT("non-directive expression statement or no longer in prologue; " + "prologue terminated if still active")); + } + + stmt_flags |= DUK__HAS_VAL | DUK__HAS_TERM; + } + } /* end switch (tok) */ + + /* + * Statement value handling. + * + * Global code and eval code has an implicit return value + * which comes from the last statement with a value + * (technically a non-"empty" continuation, which is + * different from an empty statement). + * + * Since we don't know whether a later statement will + * override the value of the current statement, we need + * to coerce the statement value to a register allocated + * for implicit return values. In other cases we need + * to coerce the statement value to a plain value to get + * any side effects out (consider e.g. "foo.bar;"). + */ + + /* XXX: what about statements which leave a half-cooked value in 'res' + * but have no stmt value? Any such statements? + */ + + if (stmt_flags & DUK__HAS_VAL) { + duk_regconst_t reg_stmt_value = comp_ctx->curr_func.reg_stmt_value; + if (reg_stmt_value >= 0) { + duk__ivalue_toforcedreg(comp_ctx, res, reg_stmt_value); + } else { + duk__ivalue_toplain_ignore(comp_ctx, res); + } + } else { + ; + } + + /* + * Statement terminator check, including automatic semicolon + * handling. After this step, 'curr_tok' should be the first + * token after a possible statement terminator. + */ + + if (stmt_flags & DUK__HAS_TERM) { + if (comp_ctx->curr_token.t == DUK_TOK_SEMICOLON) { + DUK_DDD(DUK_DDDPRINT("explicit semicolon terminates statement")); + duk__advance(comp_ctx); + } else { + if (comp_ctx->curr_token.allow_auto_semi) { + DUK_DDD(DUK_DDDPRINT("automatic semicolon terminates statement")); + } else if (stmt_flags & DUK__ALLOW_AUTO_SEMI_ALWAYS) { + /* XXX: make this lenience dependent on flags or strictness? */ + DUK_DDD(DUK_DDDPRINT("automatic semicolon terminates statement (allowed for compatibility " + "even though no lineterm present before next token)")); + } else { + DUK_ERROR_SYNTAX(thr, DUK_STR_UNTERMINATED_STMT); + DUK_WO_NORETURN(return;); + } + } + } else { + DUK_DDD(DUK_DDDPRINT("statement has no terminator")); + } + + /* + * Directive prologue tracking. + */ + + if (stmt_flags & DUK__STILL_PROLOGUE) { + DUK_DDD(DUK_DDDPRINT("setting in_directive_prologue")); + comp_ctx->curr_func.in_directive_prologue = 1; + } + + /* + * Cleanups (all statement parsing flows through here). + * + * Pop label site and reset labels. Reset 'next temp' to value at + * entry to reuse temps. + */ + + if (label_id >= 0) { + duk__emit_bc(comp_ctx, + DUK_OP_ENDLABEL, + (duk_regconst_t) label_id); + } + + DUK__SETTEMP(comp_ctx, temp_at_entry); + + duk__reset_labels_to_length(comp_ctx, labels_len_at_entry); + + /* XXX: return indication of "terminalness" (e.g. a 'throw' is terminal) */ + + DUK__RECURSION_DECREASE(comp_ctx, thr); +} + +/* + * Parse a statement list. + * + * Handles automatic semicolon insertion and implicit return value. + * + * Upon entry, 'curr_tok' should contain the first token of the first + * statement (parsed in the "allow regexp literal" mode). Upon exit, + * 'curr_tok' contains the token following the statement list terminator + * (EOF or closing brace). + */ + +DUK_LOCAL void duk__parse_stmts(duk_compiler_ctx *comp_ctx, duk_bool_t allow_source_elem, duk_bool_t expect_eof, duk_bool_t regexp_after) { + duk_hthread *thr = comp_ctx->thr; + duk_ivalue res_alloc; + duk_ivalue *res = &res_alloc; + + /* Setup state. Initial ivalue is 'undefined'. */ + + duk_require_stack(thr, DUK__PARSE_STATEMENTS_SLOTS); + + /* XXX: 'res' setup can be moved to function body level; in fact, two 'res' + * intermediate values suffice for parsing of each function. Nesting is needed + * for nested functions (which may occur inside expressions). + */ + + duk_memzero(&res_alloc, sizeof(res_alloc)); + res->t = DUK_IVAL_PLAIN; + res->x1.t = DUK_ISPEC_VALUE; + res->x1.valstack_idx = duk_get_top(thr); + res->x2.valstack_idx = res->x1.valstack_idx + 1; + duk_push_undefined(thr); + duk_push_undefined(thr); + + /* Parse statements until a closing token (EOF or '}') is found. */ + + for (;;) { + /* Check whether statement list ends. */ + + if (expect_eof) { + if (comp_ctx->curr_token.t == DUK_TOK_EOF) { + break; + } + } else { + if (comp_ctx->curr_token.t == DUK_TOK_RCURLY) { + break; + } + } + + /* Check statement type based on the first token type. + * + * Note: expression parsing helpers expect 'curr_tok' to + * contain the first token of the expression upon entry. + */ + + DUK_DDD(DUK_DDDPRINT("TOKEN %ld (non-whitespace, non-comment)", (long) comp_ctx->curr_token.t)); + + duk__parse_stmt(comp_ctx, res, allow_source_elem); + } + + /* RegExp is allowed / not allowed depending on context. For function + * declarations RegExp is allowed because it follows a function + * declaration statement and may appear as part of the next statement. + * For function expressions RegExp is not allowed, and it's possible + * to do something like '(function () {} / 123)'. + */ + if (regexp_after) { + comp_ctx->curr_func.allow_regexp_in_adv = 1; + } + duk__advance(comp_ctx); + + /* Tear down state. */ + + duk_pop_2(thr); +} + +/* + * Declaration binding instantiation conceptually happens when calling a + * function; for us it essentially means that function prologue. The + * conceptual process is described in E5 Section 10.5. + * + * We need to keep track of all encountered identifiers to (1) create an + * identifier-to-register map ("varmap"); and (2) detect duplicate + * declarations. Identifiers which are not bound to registers still need + * to be tracked for detecting duplicates. Currently such identifiers + * are put into the varmap with a 'null' value, which is later cleaned up. + * + * To support functions with a large number of variable and function + * declarations, registers are not allocated beyond a certain limit; + * after that limit, variables and functions need slow path access. + * Arguments are currently always register bound, which imposes a hard + * (and relatively small) argument count limit. + * + * Some bindings in E5 are not configurable (= deletable) and almost all + * are mutable (writable). Exceptions are: + * + * - The 'arguments' binding, established only if no shadowing argument + * or function declaration exists. We handle 'arguments' creation + * and binding through an explicit slow path environment record. + * + * - The "name" binding for a named function expression. This is also + * handled through an explicit slow path environment record. + */ + +/* XXX: add support for variables to not be register bound always, to + * handle cases with a very large number of variables? + */ + +DUK_LOCAL void duk__init_varmap_and_prologue_for_pass2(duk_compiler_ctx *comp_ctx, duk_regconst_t *out_stmt_value_reg) { + duk_hthread *thr = comp_ctx->thr; + duk_hstring *h_name; + duk_bool_t configurable_bindings; + duk_uarridx_t num_args; + duk_uarridx_t num_decls; + duk_regconst_t rc_name; + duk_small_uint_t declvar_flags; + duk_uarridx_t i; +#if defined(DUK_USE_ASSERTIONS) + duk_idx_t entry_top; +#endif + +#if defined(DUK_USE_ASSERTIONS) + entry_top = duk_get_top(thr); +#endif + + /* + * Preliminaries + */ + + configurable_bindings = comp_ctx->curr_func.is_eval; + DUK_DDD(DUK_DDDPRINT("configurable_bindings=%ld", (long) configurable_bindings)); + + /* varmap is already in comp_ctx->curr_func.varmap_idx */ + + /* + * Function formal arguments, always bound to registers + * (there's no support for shuffling them now). + */ + + num_args = (duk_uarridx_t) duk_get_length(thr, comp_ctx->curr_func.argnames_idx); + DUK_DDD(DUK_DDDPRINT("num_args=%ld", (long) num_args)); + /* XXX: check num_args */ + + for (i = 0; i < num_args; i++) { + duk_get_prop_index(thr, comp_ctx->curr_func.argnames_idx, i); + h_name = duk_known_hstring(thr, -1); + + if (comp_ctx->curr_func.is_strict) { + if (duk__hstring_is_eval_or_arguments(comp_ctx, h_name)) { + DUK_DDD(DUK_DDDPRINT("arg named 'eval' or 'arguments' in strict mode -> SyntaxError")); + goto error_argname; + } + duk_dup_top(thr); + if (duk_has_prop(thr, comp_ctx->curr_func.varmap_idx)) { + DUK_DDD(DUK_DDDPRINT("duplicate arg name in strict mode -> SyntaxError")); + goto error_argname; + } + + /* Ensure argument name is not a reserved word in current + * (final) strictness. Formal argument parsing may not + * catch reserved names if strictness changes during + * parsing. + * + * We only need to do this in strict mode because non-strict + * keyword are always detected in formal argument parsing. + */ + + if (DUK_HSTRING_HAS_STRICT_RESERVED_WORD(h_name)) { + goto error_argname; + } + } + + /* overwrite any previous binding of the same name; the effect is + * that last argument of a certain name wins. + */ + + /* only functions can have arguments */ + DUK_ASSERT(comp_ctx->curr_func.is_function); + duk_push_uarridx(thr, i); /* -> [ ... name index ] */ + duk_put_prop(thr, comp_ctx->curr_func.varmap_idx); /* -> [ ... ] */ + + /* no code needs to be emitted, the regs already have values */ + } + + /* use temp_next for tracking register allocations */ + DUK__SETTEMP_CHECKMAX(comp_ctx, (duk_regconst_t) num_args); + + /* + * After arguments, allocate special registers (like shuffling temps) + */ + + if (out_stmt_value_reg) { + *out_stmt_value_reg = DUK__ALLOCTEMP(comp_ctx); + } + if (comp_ctx->curr_func.needs_shuffle) { + duk_regconst_t shuffle_base = DUK__ALLOCTEMPS(comp_ctx, 3); + comp_ctx->curr_func.shuffle1 = shuffle_base; + comp_ctx->curr_func.shuffle2 = shuffle_base + 1; + comp_ctx->curr_func.shuffle3 = shuffle_base + 2; + DUK_D(DUK_DPRINT("shuffle registers needed by function, allocated: %ld %ld %ld", + (long) comp_ctx->curr_func.shuffle1, + (long) comp_ctx->curr_func.shuffle2, + (long) comp_ctx->curr_func.shuffle3)); + } + if (comp_ctx->curr_func.temp_next > 0x100) { + DUK_D(DUK_DPRINT("not enough 8-bit regs: temp_next=%ld", (long) comp_ctx->curr_func.temp_next)); + goto error_outofregs; + } + + /* + * Function declarations + */ + + num_decls = (duk_uarridx_t) duk_get_length(thr, comp_ctx->curr_func.decls_idx); + DUK_DDD(DUK_DDDPRINT("num_decls=%ld -> %!T", + (long) num_decls, + (duk_tval *) duk_get_tval(thr, comp_ctx->curr_func.decls_idx))); + for (i = 0; i < num_decls; i += 2) { + duk_int_t decl_type; + duk_int_t fnum; + + duk_get_prop_index(thr, comp_ctx->curr_func.decls_idx, i + 1); /* decl type */ + decl_type = duk_to_int(thr, -1); + fnum = decl_type >> 8; /* XXX: macros */ + decl_type = decl_type & 0xff; + duk_pop(thr); + + if (decl_type != DUK_DECL_TYPE_FUNC) { + continue; + } + + duk_get_prop_index(thr, comp_ctx->curr_func.decls_idx, i); /* decl name */ + + /* XXX: spilling */ + if (comp_ctx->curr_func.is_function) { + duk_regconst_t reg_bind; + duk_dup_top(thr); + if (duk_has_prop(thr, comp_ctx->curr_func.varmap_idx)) { + /* shadowed; update value */ + duk_dup_top(thr); + duk_get_prop(thr, comp_ctx->curr_func.varmap_idx); + reg_bind = duk_to_int(thr, -1); /* [ ... name reg_bind ] */ + duk__emit_a_bc(comp_ctx, + DUK_OP_CLOSURE, + reg_bind, + (duk_regconst_t) fnum); + } else { + /* function: always register bound */ + reg_bind = DUK__ALLOCTEMP(comp_ctx); + duk__emit_a_bc(comp_ctx, + DUK_OP_CLOSURE, + reg_bind, + (duk_regconst_t) fnum); + duk_push_int(thr, (duk_int_t) reg_bind); + } + } else { + /* Function declaration for global/eval code is emitted even + * for duplicates, because of E5 Section 10.5, step 5.e of + * E5.1 (special behavior for variable bound to global object). + * + * DECLVAR will not re-declare a variable as such, but will + * update the binding value. + */ + + duk_regconst_t reg_temp = DUK__ALLOCTEMP(comp_ctx); + duk_dup_top(thr); + rc_name = duk__getconst(comp_ctx); + duk_push_null(thr); + + duk__emit_a_bc(comp_ctx, + DUK_OP_CLOSURE, + reg_temp, + (duk_regconst_t) fnum); + + declvar_flags = DUK_PROPDESC_FLAG_WRITABLE | + DUK_PROPDESC_FLAG_ENUMERABLE | + DUK_BC_DECLVAR_FLAG_FUNC_DECL; + + if (configurable_bindings) { + declvar_flags |= DUK_PROPDESC_FLAG_CONFIGURABLE; + } + + duk__emit_a_b_c(comp_ctx, + DUK_OP_DECLVAR | DUK__EMIT_FLAG_NO_SHUFFLE_A | DUK__EMIT_FLAG_BC_REGCONST, + (duk_regconst_t) declvar_flags /*flags*/, + rc_name /*name*/, + reg_temp /*value*/); + + DUK__SETTEMP(comp_ctx, reg_temp); /* forget temp */ + } + + DUK_DDD(DUK_DDDPRINT("function declaration to varmap: %!T -> %!T", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_NULL(duk_get_tval(thr, -1)) || DUK_TVAL_IS_FASTINT(duk_get_tval(thr, -1))); +#endif + duk_put_prop(thr, comp_ctx->curr_func.varmap_idx); /* [ ... name reg/null ] -> [ ... ] */ + } + + /* + * 'arguments' binding is special; if a shadowing argument or + * function declaration exists, an arguments object will + * definitely not be needed, regardless of whether the identifier + * 'arguments' is referenced inside the function body. + */ + + if (duk_has_prop_stridx(thr, comp_ctx->curr_func.varmap_idx, DUK_STRIDX_LC_ARGUMENTS)) { + DUK_DDD(DUK_DDDPRINT("'arguments' is shadowed by argument or function declaration " + "-> arguments object creation can be skipped")); + comp_ctx->curr_func.is_arguments_shadowed = 1; + } + + /* + * Variable declarations. + * + * Unlike function declarations, variable declaration values don't get + * assigned on entry. If a binding of the same name already exists, just + * ignore it silently. + */ + + for (i = 0; i < num_decls; i += 2) { + duk_int_t decl_type; + + duk_get_prop_index(thr, comp_ctx->curr_func.decls_idx, i + 1); /* decl type */ + decl_type = duk_to_int(thr, -1); + decl_type = decl_type & 0xff; + duk_pop(thr); + + if (decl_type != DUK_DECL_TYPE_VAR) { + continue; + } + + duk_get_prop_index(thr, comp_ctx->curr_func.decls_idx, i); /* decl name */ + + if (duk_has_prop(thr, comp_ctx->curr_func.varmap_idx)) { + /* shadowed, ignore */ + } else { + duk_get_prop_index(thr, comp_ctx->curr_func.decls_idx, i); /* decl name */ + h_name = duk_known_hstring(thr, -1); + + if (h_name == DUK_HTHREAD_STRING_LC_ARGUMENTS(thr) && + !comp_ctx->curr_func.is_arguments_shadowed) { + /* E5 Section steps 7-8 */ + DUK_DDD(DUK_DDDPRINT("'arguments' not shadowed by a function declaration, " + "but appears as a variable declaration -> treat as " + "a no-op for variable declaration purposes")); + duk_pop(thr); + continue; + } + + /* XXX: spilling */ + if (comp_ctx->curr_func.is_function) { + duk_regconst_t reg_bind = DUK__ALLOCTEMP(comp_ctx); + /* no need to init reg, it will be undefined on entry */ + duk_push_int(thr, (duk_int_t) reg_bind); + } else { + duk_dup_top(thr); + rc_name = duk__getconst(comp_ctx); + duk_push_null(thr); + + declvar_flags = DUK_PROPDESC_FLAG_WRITABLE | + DUK_PROPDESC_FLAG_ENUMERABLE; + if (configurable_bindings) { + declvar_flags |= DUK_PROPDESC_FLAG_CONFIGURABLE; + } + + duk__emit_a_b_c(comp_ctx, + DUK_OP_DECLVAR | DUK__EMIT_FLAG_NO_SHUFFLE_A | DUK__EMIT_FLAG_BC_REGCONST, + (duk_regconst_t) declvar_flags /*flags*/, + rc_name /*name*/, + 0 /*value*/); + } + + duk_put_prop(thr, comp_ctx->curr_func.varmap_idx); /* [ ... name reg/null ] -> [ ... ] */ + } + } + + /* + * Wrap up + */ + + DUK_DDD(DUK_DDDPRINT("varmap: %!T, is_arguments_shadowed=%ld", + (duk_tval *) duk_get_tval(thr, comp_ctx->curr_func.varmap_idx), + (long) comp_ctx->curr_func.is_arguments_shadowed)); + + DUK_ASSERT_TOP(thr, entry_top); + return; + + error_outofregs: + DUK_ERROR_RANGE(thr, DUK_STR_REG_LIMIT); + DUK_WO_NORETURN(return;); + + error_argname: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_ARG_NAME); + DUK_WO_NORETURN(return;); +} + +/* + * Parse a function-body-like expression (FunctionBody or Program + * in E5 grammar) using a two-pass parse. The productions appear + * in the following contexts: + * + * - function expression + * - function statement + * - function declaration + * - getter in object literal + * - setter in object literal + * - global code + * - eval code + * - Function constructor body + * + * This function only parses the statement list of the body; the argument + * list and possible function name must be initialized by the caller. + * For instance, for Function constructor, the argument names are originally + * on the value stack. The parsing of statements ends either at an EOF or + * a closing brace; this is controlled by an input flag. + * + * Note that there are many differences affecting parsing and even code + * generation: + * + * - Global and eval code have an implicit return value generated + * by the last statement; function code does not + * + * - Global code, eval code, and Function constructor body end in + * an EOF, other bodies in a closing brace ('}') + * + * Upon entry, 'curr_tok' is ignored and the function will pull in the + * first token on its own. Upon exit, 'curr_tok' is the terminating + * token (EOF or closing brace). + */ + +DUK_LOCAL void duk__parse_func_body(duk_compiler_ctx *comp_ctx, duk_bool_t expect_eof, duk_bool_t implicit_return_value, duk_bool_t regexp_after, duk_small_int_t expect_token) { + duk_compiler_func *func; + duk_hthread *thr; + duk_regconst_t reg_stmt_value = -1; + duk_lexer_point lex_pt; + duk_regconst_t temp_first; + duk_small_int_t compile_round = 1; + + DUK_ASSERT(comp_ctx != NULL); + + thr = comp_ctx->thr; + DUK_ASSERT(thr != NULL); + + func = &comp_ctx->curr_func; + DUK_ASSERT(func != NULL); + + DUK__RECURSION_INCREASE(comp_ctx, thr); + + duk_require_stack(thr, DUK__FUNCTION_BODY_REQUIRE_SLOTS); + + /* + * Store lexer position for a later rewind + */ + + DUK_LEXER_GETPOINT(&comp_ctx->lex, &lex_pt); + + /* + * Program code (global and eval code) has an implicit return value + * from the last statement value (e.g. eval("1; 2+3;") returns 3). + * This is not the case with functions. If implicit statement return + * value is requested, all statements are coerced to a register + * allocated here, and used in the implicit return statement below. + */ + + /* XXX: this is pointless here because pass 1 is throw-away */ + if (implicit_return_value) { + reg_stmt_value = DUK__ALLOCTEMP(comp_ctx); + + /* If an implicit return value is needed by caller, it must be + * initialized to 'undefined' because we don't know whether any + * non-empty (where "empty" is a continuation type, and different + * from an empty statement) statements will be executed. + * + * However, since 1st pass is a throwaway one, no need to emit + * it here. + */ +#if 0 + duk__emit_bc(comp_ctx, + DUK_OP_LDUNDEF, + 0); +#endif + } + + /* + * First pass. + * + * Gather variable/function declarations needed for second pass. + * Code generated is dummy and discarded. + */ + + func->in_directive_prologue = 1; + func->in_scanning = 1; + func->may_direct_eval = 0; + func->id_access_arguments = 0; + func->id_access_slow = 0; + func->id_access_slow_own = 0; + func->reg_stmt_value = reg_stmt_value; +#if defined(DUK_USE_DEBUGGER_SUPPORT) + func->min_line = DUK_INT_MAX; + func->max_line = 0; +#endif + + /* duk__parse_stmts() expects curr_tok to be set; parse in "allow + * regexp literal" mode with current strictness. + */ + if (expect_token >= 0) { + /* Eating a left curly; regexp mode is allowed by left curly + * based on duk__token_lbp[] automatically. + */ + DUK_ASSERT(expect_token == DUK_TOK_LCURLY); + duk__update_lineinfo_currtoken(comp_ctx); + duk__advance_expect(comp_ctx, expect_token); + } else { + /* Need to set curr_token.t because lexing regexp mode depends on current + * token type. Zero value causes "allow regexp" mode. + */ + comp_ctx->curr_token.t = 0; + duk__advance(comp_ctx); + } + + DUK_DDD(DUK_DDDPRINT("begin 1st pass")); + duk__parse_stmts(comp_ctx, + 1, /* allow source elements */ + expect_eof, /* expect EOF instead of } */ + regexp_after); /* regexp after */ + DUK_DDD(DUK_DDDPRINT("end 1st pass")); + + /* + * Second (and possibly third) pass. + * + * Generate actual code. In most cases the need for shuffle + * registers is detected during pass 1, but in some corner cases + * we'll only detect it during pass 2 and a third pass is then + * needed (see GH-115). + */ + + for (;;) { + duk_bool_t needs_shuffle_before = comp_ctx->curr_func.needs_shuffle; + compile_round++; + + /* + * Rewind lexer. + * + * duk__parse_stmts() expects curr_tok to be set; parse in "allow regexp + * literal" mode with current strictness. + * + * curr_token line number info should be initialized for pass 2 before + * generating prologue, to ensure prologue bytecode gets nice line numbers. + */ + + DUK_DDD(DUK_DDDPRINT("rewind lexer")); + DUK_LEXER_SETPOINT(&comp_ctx->lex, &lex_pt); + comp_ctx->curr_token.t = 0; /* this is needed for regexp mode */ + comp_ctx->curr_token.start_line = 0; /* needed for line number tracking (becomes prev_token.start_line) */ + duk__advance(comp_ctx); + + /* + * Reset function state and perform register allocation, which creates + * 'varmap' for second pass. Function prologue for variable declarations, + * binding value initializations etc is emitted as a by-product. + * + * Strict mode restrictions for duplicate and invalid argument + * names are checked here now that we know whether the function + * is actually strict. See: test-dev-strict-mode-boundary.js. + * + * Inner functions are compiled during pass 1 and are not reset. + */ + + duk__reset_func_for_pass2(comp_ctx); + func->in_directive_prologue = 1; + func->in_scanning = 0; + + /* must be able to emit code, alloc consts, etc. */ + + duk__init_varmap_and_prologue_for_pass2(comp_ctx, + (implicit_return_value ? ®_stmt_value : NULL)); + func->reg_stmt_value = reg_stmt_value; + + temp_first = DUK__GETTEMP(comp_ctx); + + func->temp_first = temp_first; + func->temp_next = temp_first; + func->stmt_next = 0; + func->label_next = 0; + + /* XXX: init or assert catch depth etc -- all values */ + func->id_access_arguments = 0; + func->id_access_slow = 0; + func->id_access_slow_own = 0; + + /* + * Check function name validity now that we know strictness. + * This only applies to function declarations and expressions, + * not setter/getter name. + * + * See: test-dev-strict-mode-boundary.js + */ + + if (func->is_function && !func->is_setget && func->h_name != NULL) { + if (func->is_strict) { + if (duk__hstring_is_eval_or_arguments(comp_ctx, func->h_name)) { + DUK_DDD(DUK_DDDPRINT("func name is 'eval' or 'arguments' in strict mode")); + goto error_funcname; + } + if (DUK_HSTRING_HAS_STRICT_RESERVED_WORD(func->h_name)) { + DUK_DDD(DUK_DDDPRINT("func name is a reserved word in strict mode")); + goto error_funcname; + } + } else { + if (DUK_HSTRING_HAS_RESERVED_WORD(func->h_name) && + !DUK_HSTRING_HAS_STRICT_RESERVED_WORD(func->h_name)) { + DUK_DDD(DUK_DDDPRINT("func name is a reserved word in non-strict mode")); + goto error_funcname; + } + } + } + + /* + * Second pass parsing. + */ + + if (implicit_return_value) { + /* Default implicit return value. */ + duk__emit_bc(comp_ctx, + DUK_OP_LDUNDEF, + 0); + } + + DUK_DDD(DUK_DDDPRINT("begin 2nd pass")); + duk__parse_stmts(comp_ctx, + 1, /* allow source elements */ + expect_eof, /* expect EOF instead of } */ + regexp_after); /* regexp after */ + DUK_DDD(DUK_DDDPRINT("end 2nd pass")); + + duk__update_lineinfo_currtoken(comp_ctx); + + if (needs_shuffle_before == comp_ctx->curr_func.needs_shuffle) { + /* Shuffle decision not changed. */ + break; + } + if (compile_round >= 3) { + /* Should never happen but avoid infinite loop just in case. */ + DUK_D(DUK_DPRINT("more than 3 compile passes needed, should never happen")); + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return;); + } + DUK_D(DUK_DPRINT("need additional round to compile function, round now %d", (int) compile_round)); + } + + /* + * Emit a final RETURN. + * + * It would be nice to avoid emitting an unnecessary "return" opcode + * if the current PC is not reachable. However, this cannot be reliably + * detected; even if the previous instruction is an unconditional jump, + * there may be a previous jump which jumps to current PC (which is the + * case for iteration and conditional statements, for instance). + */ + + /* XXX: request a "last statement is terminal" from duk__parse_stmt() and duk__parse_stmts(); + * we could avoid the last RETURN if we could ensure there is no way to get here + * (directly or via a jump) + */ + + DUK_ASSERT(comp_ctx->curr_func.catch_depth == 0); + if (reg_stmt_value >= 0) { + DUK_ASSERT(DUK__ISREG(reg_stmt_value)); + duk__emit_bc(comp_ctx, DUK_OP_RETREG, reg_stmt_value /*reg*/); + } else { + duk__emit_op_only(comp_ctx, DUK_OP_RETUNDEF); + } + + /* + * Peephole optimize JUMP chains. + */ + + duk__peephole_optimize_bytecode(comp_ctx); + + /* + * comp_ctx->curr_func is now ready to be converted into an actual + * function template. + */ + + DUK__RECURSION_DECREASE(comp_ctx, thr); + return; + + error_funcname: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_FUNC_NAME); + DUK_WO_NORETURN(return;); +} + +/* + * Parse a function-like expression: + * + * - function expression + * - function declaration + * - function statement (non-standard) + * - setter/getter + * + * Adds the function to comp_ctx->curr_func function table and returns the + * function number. + * + * On entry, curr_token points to: + * + * - the token after 'function' for function expression/declaration/statement + * - the token after 'set' or 'get' for setter/getter + */ + +/* Parse formals. */ +DUK_LOCAL void duk__parse_func_formals(duk_compiler_ctx *comp_ctx) { + duk_hthread *thr = comp_ctx->thr; + duk_bool_t first = 1; + duk_uarridx_t n; + + for (;;) { + if (comp_ctx->curr_token.t == DUK_TOK_RPAREN) { + break; + } + + if (first) { + /* no comma */ + first = 0; + } else { + duk__advance_expect(comp_ctx, DUK_TOK_COMMA); + } + + /* Note: when parsing a formal list in non-strict context, e.g. + * "implements" is parsed as an identifier. When the function is + * later detected to be strict, the argument list must be rechecked + * against a larger set of reserved words (that of strict mode). + * This is handled by duk__parse_func_body(). Here we recognize + * whatever tokens are considered reserved in current strictness + * (which is not always enough). + */ + + if (comp_ctx->curr_token.t != DUK_TOK_IDENTIFIER) { + DUK_ERROR_SYNTAX(thr, DUK_STR_EXPECTED_IDENTIFIER); + DUK_WO_NORETURN(return;); + } + DUK_ASSERT(comp_ctx->curr_token.t == DUK_TOK_IDENTIFIER); + DUK_ASSERT(comp_ctx->curr_token.str1 != NULL); + DUK_DDD(DUK_DDDPRINT("formal argument: %!O", + (duk_heaphdr *) comp_ctx->curr_token.str1)); + + /* XXX: append primitive */ + duk_push_hstring(thr, comp_ctx->curr_token.str1); + n = (duk_uarridx_t) duk_get_length(thr, comp_ctx->curr_func.argnames_idx); + duk_put_prop_index(thr, comp_ctx->curr_func.argnames_idx, n); + + duk__advance(comp_ctx); /* eat identifier */ + } +} + +/* Parse a function-like expression, assuming that 'comp_ctx->curr_func' is + * correctly set up. Assumes that curr_token is just after 'function' (or + * 'set'/'get' etc). + */ +DUK_LOCAL void duk__parse_func_like_raw(duk_compiler_ctx *comp_ctx, duk_small_uint_t flags) { + duk_hthread *thr = comp_ctx->thr; + duk_token *tok; + duk_bool_t no_advance; + + DUK_ASSERT(comp_ctx->curr_func.num_formals == 0); + DUK_ASSERT(comp_ctx->curr_func.is_function == 1); + DUK_ASSERT(comp_ctx->curr_func.is_eval == 0); + DUK_ASSERT(comp_ctx->curr_func.is_global == 0); + DUK_ASSERT(comp_ctx->curr_func.is_setget == ((flags & DUK__FUNC_FLAG_GETSET) != 0)); + + duk__update_lineinfo_currtoken(comp_ctx); + + /* + * Function name (if any) + * + * We don't check for prohibited names here, because we don't + * yet know whether the function will be strict. Function body + * parsing handles this retroactively. + * + * For function expressions and declarations function name must + * be an Identifer (excludes reserved words). For setter/getter + * it is a PropertyName which allows reserved words and also + * strings and numbers (e.g. "{ get 1() { ... } }"). + * + * Function parsing may start either from prev_token or curr_token + * (object literal method definition uses prev_token for example). + * This is dealt with for the initial token. + */ + + no_advance = (flags & DUK__FUNC_FLAG_USE_PREVTOKEN); + if (no_advance) { + tok = &comp_ctx->prev_token; + } else { + tok = &comp_ctx->curr_token; + } + + if (flags & DUK__FUNC_FLAG_GETSET) { + /* PropertyName -> IdentifierName | StringLiteral | NumericLiteral */ + if (tok->t_nores == DUK_TOK_IDENTIFIER || tok->t == DUK_TOK_STRING) { + duk_push_hstring(thr, tok->str1); /* keep in valstack */ + } else if (tok->t == DUK_TOK_NUMBER) { + duk_push_number(thr, tok->num); + duk_to_string(thr, -1); + } else { + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_GETSET_NAME); + DUK_WO_NORETURN(return;); + } + comp_ctx->curr_func.h_name = duk_known_hstring(thr, -1); /* borrowed reference */ + } else { + /* Function name is an Identifier (not IdentifierName), but we get + * the raw name (not recognizing keywords) here and perform the name + * checks only after pass 1. + */ + if (tok->t_nores == DUK_TOK_IDENTIFIER) { + duk_push_hstring(thr, tok->str1); /* keep in valstack */ + comp_ctx->curr_func.h_name = duk_known_hstring(thr, -1); /* borrowed reference */ + } else { + /* valstack will be unbalanced, which is OK */ + DUK_ASSERT((flags & DUK__FUNC_FLAG_GETSET) == 0); + DUK_ASSERT(comp_ctx->curr_func.h_name == NULL); + no_advance = 1; + if (flags & DUK__FUNC_FLAG_DECL) { + DUK_ERROR_SYNTAX(thr, DUK_STR_FUNC_NAME_REQUIRED); + DUK_WO_NORETURN(return;); + } + } + } + + DUK_DD(DUK_DDPRINT("function name: %!O", + (duk_heaphdr *) comp_ctx->curr_func.h_name)); + + if (!no_advance) { + duk__advance(comp_ctx); + } + + /* + * Formal argument list + * + * We don't check for prohibited names or for duplicate argument + * names here, becase we don't yet know whether the function will + * be strict. Function body parsing handles this retroactively. + */ + + duk__advance_expect(comp_ctx, DUK_TOK_LPAREN); + + duk__parse_func_formals(comp_ctx); + + DUK_ASSERT(comp_ctx->curr_token.t == DUK_TOK_RPAREN); + duk__advance(comp_ctx); + + /* + * Parse function body + */ + + duk__parse_func_body(comp_ctx, + 0, /* expect_eof */ + 0, /* implicit_return_value */ + flags & DUK__FUNC_FLAG_DECL, /* regexp_after */ + DUK_TOK_LCURLY); /* expect_token */ + + /* + * Convert duk_compiler_func to a function template and add it + * to the parent function table. + */ + + duk__convert_to_func_template(comp_ctx); /* -> [ ... func ] */ +} + +/* Parse an inner function, adding the function template to the current function's + * function table. Return a function number to be used by the outer function. + * + * Avoiding O(depth^2) inner function parsing is handled here. On the first pass, + * compile and register the function normally into the 'funcs' array, also recording + * a lexer point (offset/line) to the closing brace of the function. On the second + * pass, skip the function and return the same 'fnum' as on the first pass by using + * a running counter. + * + * An unfortunate side effect of this is that when parsing the inner function, almost + * nothing is known of the outer function, i.e. the inner function's scope. We don't + * need that information at the moment, but it would allow some optimizations if it + * were used. + */ +DUK_LOCAL duk_int_t duk__parse_func_like_fnum(duk_compiler_ctx *comp_ctx, duk_small_uint_t flags) { + duk_hthread *thr = comp_ctx->thr; + duk_compiler_func old_func; + duk_idx_t entry_top; + duk_int_t fnum; + + /* + * On second pass, skip the function. + */ + + if (!comp_ctx->curr_func.in_scanning) { + duk_lexer_point lex_pt; + + fnum = comp_ctx->curr_func.fnum_next++; + duk_get_prop_index(thr, comp_ctx->curr_func.funcs_idx, (duk_uarridx_t) (fnum * 3 + 1)); + lex_pt.offset = (duk_size_t) duk_to_uint(thr, -1); + duk_pop(thr); + duk_get_prop_index(thr, comp_ctx->curr_func.funcs_idx, (duk_uarridx_t) (fnum * 3 + 2)); + lex_pt.line = duk_to_int(thr, -1); + duk_pop(thr); + + DUK_DDD(DUK_DDDPRINT("second pass of an inner func, skip the function, reparse closing brace; lex offset=%ld, line=%ld", + (long) lex_pt.offset, (long) lex_pt.line)); + + DUK_LEXER_SETPOINT(&comp_ctx->lex, &lex_pt); + comp_ctx->curr_token.t = 0; /* this is needed for regexp mode */ + comp_ctx->curr_token.start_line = 0; /* needed for line number tracking (becomes prev_token.start_line) */ + duk__advance(comp_ctx); + + /* RegExp is not allowed after a function expression, e.g. in + * (function () {} / 123). A RegExp *is* allowed after a + * function declaration! + */ + if (flags & DUK__FUNC_FLAG_DECL) { + comp_ctx->curr_func.allow_regexp_in_adv = 1; + } + duk__advance_expect(comp_ctx, DUK_TOK_RCURLY); + + return fnum; + } + + /* + * On first pass, perform actual parsing. Remember valstack top on entry + * to restore it later, and switch to using a new function in comp_ctx. + */ + + entry_top = duk_get_top(thr); + DUK_DDD(DUK_DDDPRINT("before func: entry_top=%ld, curr_tok.start_offset=%ld", + (long) entry_top, (long) comp_ctx->curr_token.start_offset)); + + duk_memcpy(&old_func, &comp_ctx->curr_func, sizeof(duk_compiler_func)); + + duk_memzero(&comp_ctx->curr_func, sizeof(duk_compiler_func)); + duk__init_func_valstack_slots(comp_ctx); + DUK_ASSERT(comp_ctx->curr_func.num_formals == 0); + + /* inherit initial strictness from parent */ + comp_ctx->curr_func.is_strict = old_func.is_strict; + + /* XXX: It might be better to just store the flags into the curr_func + * struct and use them as is without this flag interpretation step + * here. + */ + DUK_ASSERT(comp_ctx->curr_func.is_notail == 0); + comp_ctx->curr_func.is_function = 1; + DUK_ASSERT(comp_ctx->curr_func.is_eval == 0); + DUK_ASSERT(comp_ctx->curr_func.is_global == 0); + comp_ctx->curr_func.is_setget = ((flags & DUK__FUNC_FLAG_GETSET) != 0); + comp_ctx->curr_func.is_namebinding = !(flags & (DUK__FUNC_FLAG_GETSET | + DUK__FUNC_FLAG_METDEF | + DUK__FUNC_FLAG_DECL)); /* no name binding for: declarations, objlit getset, objlit method def */ + comp_ctx->curr_func.is_constructable = !(flags & (DUK__FUNC_FLAG_GETSET | + DUK__FUNC_FLAG_METDEF)); /* not constructable: objlit getset, objlit method def */ + + /* + * Parse inner function + */ + + duk__parse_func_like_raw(comp_ctx, flags); /* pushes function template */ + + /* prev_token.start_offset points to the closing brace here; when skipping + * we're going to reparse the closing brace to ensure semicolon insertion + * etc work as expected. + */ + DUK_DDD(DUK_DDDPRINT("after func: prev_tok.start_offset=%ld, curr_tok.start_offset=%ld", + (long) comp_ctx->prev_token.start_offset, (long) comp_ctx->curr_token.start_offset)); + DUK_ASSERT(comp_ctx->lex.input[comp_ctx->prev_token.start_offset] == (duk_uint8_t) DUK_ASC_RCURLY); + + /* XXX: append primitive */ + DUK_ASSERT(duk_get_length(thr, old_func.funcs_idx) == (duk_size_t) (old_func.fnum_next * 3)); + fnum = old_func.fnum_next++; + + if (fnum > DUK__MAX_FUNCS) { + DUK_ERROR_RANGE(comp_ctx->thr, DUK_STR_FUNC_LIMIT); + DUK_WO_NORETURN(return 0;); + } + + /* array writes autoincrement length */ + (void) duk_put_prop_index(thr, old_func.funcs_idx, (duk_uarridx_t) (fnum * 3)); + duk_push_size_t(thr, comp_ctx->prev_token.start_offset); + (void) duk_put_prop_index(thr, old_func.funcs_idx, (duk_uarridx_t) (fnum * 3 + 1)); + duk_push_int(thr, comp_ctx->prev_token.start_line); + (void) duk_put_prop_index(thr, old_func.funcs_idx, (duk_uarridx_t) (fnum * 3 + 2)); + + /* + * Cleanup: restore original function, restore valstack state. + * + * Function declaration handling needs the function name to be pushed + * on the value stack. + */ + + if (flags & DUK__FUNC_FLAG_PUSHNAME_PASS1) { + DUK_ASSERT(comp_ctx->curr_func.h_name != NULL); + duk_push_hstring(thr, comp_ctx->curr_func.h_name); + duk_replace(thr, entry_top); + duk_set_top(thr, entry_top + 1); + } else { + duk_set_top(thr, entry_top); + } + duk_memcpy((void *) &comp_ctx->curr_func, (void *) &old_func, sizeof(duk_compiler_func)); + + return fnum; +} + +/* + * Compile input string into an executable function template without + * arguments. + * + * The string is parsed as the "Program" production of ECMAScript E5. + * Compilation context can be either global code or eval code (see E5 + * Sections 14 and 15.1.2.1). + * + * Input stack: [ ... filename ] + * Output stack: [ ... func_template ] + */ + +/* XXX: source code property */ + +DUK_LOCAL duk_ret_t duk__js_compile_raw(duk_hthread *thr, void *udata) { + duk_hstring *h_filename; + duk__compiler_stkstate *comp_stk; + duk_compiler_ctx *comp_ctx; + duk_lexer_point *lex_pt; + duk_compiler_func *func; + duk_idx_t entry_top; + duk_bool_t is_strict; + duk_bool_t is_eval; + duk_bool_t is_funcexpr; + duk_small_uint_t flags; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(udata != NULL); + + /* + * Arguments check + */ + + entry_top = duk_get_top(thr); + DUK_ASSERT(entry_top >= 1); + + comp_stk = (duk__compiler_stkstate *) udata; + comp_ctx = &comp_stk->comp_ctx_alloc; + lex_pt = &comp_stk->lex_pt_alloc; + DUK_ASSERT(comp_ctx != NULL); + DUK_ASSERT(lex_pt != NULL); + + flags = comp_stk->flags; + is_eval = (flags & DUK_COMPILE_EVAL ? 1 : 0); + is_strict = (flags & DUK_COMPILE_STRICT ? 1 : 0); + is_funcexpr = (flags & DUK_COMPILE_FUNCEXPR ? 1 : 0); + + h_filename = duk_get_hstring(thr, -1); /* may be undefined */ + + /* + * Init compiler and lexer contexts + */ + + func = &comp_ctx->curr_func; +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + comp_ctx->thr = NULL; + comp_ctx->h_filename = NULL; + comp_ctx->prev_token.str1 = NULL; + comp_ctx->prev_token.str2 = NULL; + comp_ctx->curr_token.str1 = NULL; + comp_ctx->curr_token.str2 = NULL; +#endif + + duk_require_stack(thr, DUK__COMPILE_ENTRY_SLOTS); + + duk_push_dynamic_buffer(thr, 0); /* entry_top + 0 */ + duk_push_undefined(thr); /* entry_top + 1 */ + duk_push_undefined(thr); /* entry_top + 2 */ + duk_push_undefined(thr); /* entry_top + 3 */ + duk_push_undefined(thr); /* entry_top + 4 */ + + comp_ctx->thr = thr; + comp_ctx->h_filename = h_filename; + comp_ctx->tok11_idx = entry_top + 1; + comp_ctx->tok12_idx = entry_top + 2; + comp_ctx->tok21_idx = entry_top + 3; + comp_ctx->tok22_idx = entry_top + 4; + comp_ctx->recursion_limit = DUK_USE_COMPILER_RECLIMIT; + + /* comp_ctx->lex has been pre-initialized by caller: it has been + * zeroed and input/input_length has been set. + */ + comp_ctx->lex.thr = thr; + /* comp_ctx->lex.input and comp_ctx->lex.input_length filled by caller */ + comp_ctx->lex.slot1_idx = comp_ctx->tok11_idx; + comp_ctx->lex.slot2_idx = comp_ctx->tok12_idx; + comp_ctx->lex.buf_idx = entry_top + 0; + comp_ctx->lex.buf = (duk_hbuffer_dynamic *) duk_known_hbuffer(thr, entry_top + 0); + DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(comp_ctx->lex.buf) && !DUK_HBUFFER_HAS_EXTERNAL(comp_ctx->lex.buf)); + comp_ctx->lex.token_limit = DUK_COMPILER_TOKEN_LIMIT; + + lex_pt->offset = 0; + lex_pt->line = 1; + DUK_LEXER_SETPOINT(&comp_ctx->lex, lex_pt); /* fills window */ + comp_ctx->curr_token.start_line = 0; /* needed for line number tracking (becomes prev_token.start_line) */ + + /* + * Initialize function state for a zero-argument function + */ + + duk__init_func_valstack_slots(comp_ctx); + DUK_ASSERT(func->num_formals == 0); + + if (is_funcexpr) { + /* Name will be filled from function expression, not by caller. + * This case is used by Function constructor and duk_compile() + * API with the DUK_COMPILE_FUNCTION option. + */ + DUK_ASSERT(func->h_name == NULL); + } else { + duk_push_hstring_stridx(thr, (is_eval ? DUK_STRIDX_EVAL : + DUK_STRIDX_GLOBAL)); + func->h_name = duk_get_hstring(thr, -1); + } + + /* + * Parse a function body or a function-like expression, depending + * on flags. + */ + + DUK_ASSERT(func->is_setget == 0); + func->is_strict = (duk_uint8_t) is_strict; + DUK_ASSERT(func->is_notail == 0); + + if (is_funcexpr) { + func->is_function = 1; + DUK_ASSERT(func->is_eval == 0); + DUK_ASSERT(func->is_global == 0); + func->is_namebinding = 1; + func->is_constructable = 1; + + duk__advance(comp_ctx); /* init 'curr_token' */ + duk__advance_expect(comp_ctx, DUK_TOK_FUNCTION); + (void) duk__parse_func_like_raw(comp_ctx, 0 /*flags*/); + } else { + DUK_ASSERT(func->is_function == 0); + DUK_ASSERT(is_eval == 0 || is_eval == 1); + func->is_eval = (duk_uint8_t) is_eval; + func->is_global = (duk_uint8_t) !is_eval; + DUK_ASSERT(func->is_namebinding == 0); + DUK_ASSERT(func->is_constructable == 0); + + duk__parse_func_body(comp_ctx, + 1, /* expect_eof */ + 1, /* implicit_return_value */ + 1, /* regexp_after (does not matter) */ + -1); /* expect_token */ + } + + /* + * Convert duk_compiler_func to a function template + */ + + duk__convert_to_func_template(comp_ctx); + + /* + * Wrapping duk_safe_call() will mangle the stack, just return stack top + */ + + /* [ ... filename (temps) func ] */ + + return 1; +} + +DUK_INTERNAL void duk_js_compile(duk_hthread *thr, const duk_uint8_t *src_buffer, duk_size_t src_length, duk_small_uint_t flags) { + duk__compiler_stkstate comp_stk; + duk_compiler_ctx *prev_ctx; + duk_ret_t safe_rc; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(src_buffer != NULL); + + /* preinitialize lexer state partially */ + duk_memzero(&comp_stk, sizeof(comp_stk)); + comp_stk.flags = flags; + DUK_LEXER_INITCTX(&comp_stk.comp_ctx_alloc.lex); + comp_stk.comp_ctx_alloc.lex.input = src_buffer; + comp_stk.comp_ctx_alloc.lex.input_length = src_length; + comp_stk.comp_ctx_alloc.lex.flags = flags; /* Forward flags directly for now. */ + + /* [ ... filename ] */ + + prev_ctx = thr->compile_ctx; + thr->compile_ctx = &comp_stk.comp_ctx_alloc; /* for duk_error_augment.c */ + safe_rc = duk_safe_call(thr, duk__js_compile_raw, (void *) &comp_stk /*udata*/, 1 /*nargs*/, 1 /*nrets*/); + thr->compile_ctx = prev_ctx; /* must restore reliably before returning */ + + if (safe_rc != DUK_EXEC_SUCCESS) { + DUK_D(DUK_DPRINT("compilation failed: %!T", duk_get_tval(thr, -1))); + (void) duk_throw(thr); + DUK_WO_NORETURN(return;); + } + + /* [ ... template ] */ +} + +/* automatic undefs */ +#undef DUK__ALLOCTEMP +#undef DUK__ALLOCTEMPS +#undef DUK__ALLOW_AUTO_SEMI_ALWAYS +#undef DUK__BC_INITIAL_INSTS +#undef DUK__BP_ADDITIVE +#undef DUK__BP_ASSIGNMENT +#undef DUK__BP_BAND +#undef DUK__BP_BOR +#undef DUK__BP_BXOR +#undef DUK__BP_CALL +#undef DUK__BP_CLOSING +#undef DUK__BP_COMMA +#undef DUK__BP_CONDITIONAL +#undef DUK__BP_EOF +#undef DUK__BP_EQUALITY +#undef DUK__BP_EXPONENTIATION +#undef DUK__BP_FOR_EXPR +#undef DUK__BP_INVALID +#undef DUK__BP_LAND +#undef DUK__BP_LOR +#undef DUK__BP_MEMBER +#undef DUK__BP_MULTIPLICATIVE +#undef DUK__BP_POSTFIX +#undef DUK__BP_RELATIONAL +#undef DUK__BP_SHIFT +#undef DUK__COMPILE_ENTRY_SLOTS +#undef DUK__CONST_MARKER +#undef DUK__DUMP_ISPEC +#undef DUK__DUMP_IVALUE +#undef DUK__EMIT_FLAG_A_IS_SOURCE +#undef DUK__EMIT_FLAG_BC_REGCONST +#undef DUK__EMIT_FLAG_B_IS_TARGET +#undef DUK__EMIT_FLAG_C_IS_TARGET +#undef DUK__EMIT_FLAG_NO_SHUFFLE_A +#undef DUK__EMIT_FLAG_NO_SHUFFLE_B +#undef DUK__EMIT_FLAG_NO_SHUFFLE_C +#undef DUK__EMIT_FLAG_RESERVE_JUMPSLOT +#undef DUK__EXPR_FLAG_ALLOW_EMPTY +#undef DUK__EXPR_FLAG_REJECT_IN +#undef DUK__EXPR_FLAG_REQUIRE_INIT +#undef DUK__EXPR_RBP_MASK +#undef DUK__FUNCTION_BODY_REQUIRE_SLOTS +#undef DUK__FUNCTION_INIT_REQUIRE_SLOTS +#undef DUK__FUNC_FLAG_DECL +#undef DUK__FUNC_FLAG_GETSET +#undef DUK__FUNC_FLAG_METDEF +#undef DUK__FUNC_FLAG_PUSHNAME_PASS1 +#undef DUK__FUNC_FLAG_USE_PREVTOKEN +#undef DUK__GETCONST_MAX_CONSTS_CHECK +#undef DUK__GETTEMP +#undef DUK__HAS_TERM +#undef DUK__HAS_VAL +#undef DUK__ISCONST +#undef DUK__ISREG +#undef DUK__ISREG_NOTTEMP +#undef DUK__ISREG_TEMP +#undef DUK__IS_TERMINAL +#undef DUK__IVAL_FLAG_ALLOW_CONST +#undef DUK__IVAL_FLAG_REQUIRE_SHORT +#undef DUK__IVAL_FLAG_REQUIRE_TEMP +#undef DUK__MAX_ARRAY_INIT_VALUES +#undef DUK__MAX_CONSTS +#undef DUK__MAX_FUNCS +#undef DUK__MAX_OBJECT_INIT_PAIRS +#undef DUK__MAX_TEMPS +#undef DUK__MK_LBP +#undef DUK__MK_LBP_FLAGS +#undef DUK__OBJ_LIT_KEY_GET +#undef DUK__OBJ_LIT_KEY_PLAIN +#undef DUK__OBJ_LIT_KEY_SET +#undef DUK__PARSE_EXPR_SLOTS +#undef DUK__PARSE_STATEMENTS_SLOTS +#undef DUK__RECURSION_DECREASE +#undef DUK__RECURSION_INCREASE +#undef DUK__REMOVECONST +#undef DUK__SETTEMP +#undef DUK__SETTEMP_CHECKMAX +#undef DUK__STILL_PROLOGUE +#undef DUK__TOKEN_LBP_BP_MASK +#undef DUK__TOKEN_LBP_FLAG_NO_REGEXP +#undef DUK__TOKEN_LBP_FLAG_TERMINATES +#undef DUK__TOKEN_LBP_FLAG_UNUSED +#undef DUK__TOKEN_LBP_GET_BP +#line 1 "duk_js_executor.c" +/* + * ECMAScript bytecode executor. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Local declarations. + */ + +DUK_LOCAL_DECL void duk__js_execute_bytecode_inner(duk_hthread *entry_thread, duk_activation *entry_act); + +/* + * Misc helpers. + */ + +/* Forced inline declaration, only applied for performance oriented build. */ +#if defined(DUK_USE_EXEC_PREFER_SIZE) +#define DUK__INLINE_PERF +#define DUK__NOINLINE_PERF +#else +#define DUK__INLINE_PERF DUK_ALWAYS_INLINE +#define DUK__NOINLINE_PERF DUK_NOINLINE +#endif + +/* Replace value stack top to value at 'tv_ptr'. Optimize for + * performance by only applying the net refcount change. + */ +#define DUK__REPLACE_TO_TVPTR(thr,tv_ptr) do { \ + duk_hthread *duk__thr; \ + duk_tval *duk__tvsrc; \ + duk_tval *duk__tvdst; \ + duk_tval duk__tvtmp; \ + duk__thr = (thr); \ + duk__tvsrc = DUK_GET_TVAL_NEGIDX(duk__thr, -1); \ + duk__tvdst = (tv_ptr); \ + DUK_TVAL_SET_TVAL(&duk__tvtmp, duk__tvdst); \ + DUK_TVAL_SET_TVAL(duk__tvdst, duk__tvsrc); \ + DUK_TVAL_SET_UNDEFINED(duk__tvsrc); /* value stack init policy */ \ + duk__thr->valstack_top = duk__tvsrc; \ + DUK_TVAL_DECREF(duk__thr, &duk__tvtmp); \ + } while (0) + +/* XXX: candidate of being an internal shared API call */ +#if 0 /* unused */ +DUK_LOCAL void duk__push_tvals_incref_only(duk_hthread *thr, duk_tval *tv_src, duk_small_uint_fast_t count) { + duk_tval *tv_dst; + duk_size_t copy_size; + duk_size_t i; + + tv_dst = thr->valstack_top; + copy_size = sizeof(duk_tval) * count; + duk_memcpy((void *) tv_dst, (const void *) tv_src, copy_size); + for (i = 0; i < count; i++) { + DUK_TVAL_INCREF(thr, tv_dst); + tv_dst++; + } + thr->valstack_top = tv_dst; +} +#endif + +/* + * Arithmetic, binary, and logical helpers. + * + * Note: there is no opcode for logical AND or logical OR; this is on + * purpose, because the evalution order semantics for them make such + * opcodes pretty pointless: short circuiting means they are most + * comfortably implemented as jumps. However, a logical NOT opcode + * is useful. + * + * Note: careful with duk_tval pointers here: they are potentially + * invalidated by any DECREF and almost any API call. It's still + * preferable to work without making a copy but that's not always + * possible. + */ + +DUK_LOCAL DUK__INLINE_PERF duk_double_t duk__compute_mod(duk_double_t d1, duk_double_t d2) { + return (duk_double_t) duk_js_arith_mod((double) d1, (double) d2); +} + +#if defined(DUK_USE_ES7_EXP_OPERATOR) +DUK_LOCAL DUK__INLINE_PERF duk_double_t duk__compute_exp(duk_double_t d1, duk_double_t d2) { + return (duk_double_t) duk_js_arith_pow((double) d1, (double) d2); +} +#endif + +DUK_LOCAL DUK__INLINE_PERF void duk__vm_arith_add(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_fast_t idx_z) { + /* + * Addition operator is different from other arithmetic + * operations in that it also provides string concatenation. + * Hence it is implemented separately. + * + * There is a fast path for number addition. Other cases go + * through potentially multiple coercions as described in the + * E5 specification. It may be possible to reduce the number + * of coercions, but this must be done carefully to preserve + * the exact semantics. + * + * E5 Section 11.6.1. + * + * Custom types also have special behavior implemented here. + */ + + duk_double_union du; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_y != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(thr)); + + /* + * Fast paths + */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + duk_int64_t v1, v2, v3; + duk_int32_t v3_hi; + duk_tval *tv_z; + + /* Input values are signed 48-bit so we can detect overflow + * reliably from high bits or just a comparison. + */ + + v1 = DUK_TVAL_GET_FASTINT(tv_x); + v2 = DUK_TVAL_GET_FASTINT(tv_y); + v3 = v1 + v2; + v3_hi = (duk_int32_t) (v3 >> 32); + if (DUK_LIKELY(v3_hi >= DUK_I64_CONSTANT(-0x8000) && v3_hi <= DUK_I64_CONSTANT(0x7fff))) { + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, v3); /* side effects */ + return; + } else { + /* overflow, fall through */ + ; + } + } +#endif /* DUK_USE_FASTINT */ + + if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) { +#if !defined(DUK_USE_EXEC_PREFER_SIZE) + duk_tval *tv_z; +#endif + + du.d = DUK_TVAL_GET_NUMBER(tv_x) + DUK_TVAL_GET_NUMBER(tv_y); +#if defined(DUK_USE_EXEC_PREFER_SIZE) + duk_push_number(thr, du.d); /* will NaN normalize result */ + duk_replace(thr, (duk_idx_t) idx_z); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, du.d); /* side effects */ +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + return; + } + + /* + * Slow path: potentially requires function calls for coercion + */ + + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + duk_to_primitive(thr, -2, DUK_HINT_NONE); /* side effects -> don't use tv_x, tv_y after */ + duk_to_primitive(thr, -1, DUK_HINT_NONE); + + /* Since Duktape 2.x plain buffers are treated like ArrayBuffer. */ + if (duk_is_string(thr, -2) || duk_is_string(thr, -1)) { + /* Symbols shouldn't technically be handled here, but should + * go into the default ToNumber() coercion path instead and + * fail there with a TypeError. However, there's a ToString() + * in duk_concat_2() which also fails with TypeError so no + * explicit check is needed. + */ + duk_concat_2(thr); /* [... s1 s2] -> [... s1+s2] */ + } else { + duk_double_t d1, d2; + + d1 = duk_to_number_m2(thr); + d2 = duk_to_number_m1(thr); + DUK_ASSERT(duk_is_number(thr, -2)); + DUK_ASSERT(duk_is_number(thr, -1)); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d1); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2); + + du.d = d1 + d2; + duk_pop_2_unsafe(thr); + duk_push_number(thr, du.d); /* will NaN normalize result */ + } + duk_replace(thr, (duk_idx_t) idx_z); /* side effects */ +} + +DUK_LOCAL DUK__INLINE_PERF void duk__vm_arith_binary_op(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_uint_fast_t idx_z, duk_small_uint_fast_t opcode) { + /* + * Arithmetic operations other than '+' have number-only semantics + * and are implemented here. The separate switch-case here means a + * "double dispatch" of the arithmetic opcode, but saves code space. + * + * E5 Sections 11.5, 11.5.1, 11.5.2, 11.5.3, 11.6, 11.6.1, 11.6.2, 11.6.3. + */ + + duk_double_t d1, d2; + duk_double_union du; + duk_small_uint_fast_t opcode_shifted; +#if defined(DUK_USE_FASTINT) || !defined(DUK_USE_EXEC_PREFER_SIZE) + duk_tval *tv_z; +#endif + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_y != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(thr)); + + opcode_shifted = opcode >> 2; /* Get base opcode without reg/const modifiers. */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + duk_int64_t v1, v2, v3; + duk_int32_t v3_hi; + + v1 = DUK_TVAL_GET_FASTINT(tv_x); + v2 = DUK_TVAL_GET_FASTINT(tv_y); + + switch (opcode_shifted) { + case DUK_OP_SUB >> 2: { + v3 = v1 - v2; + break; + } + case DUK_OP_MUL >> 2: { + /* Must ensure result is 64-bit (no overflow); a + * simple and sufficient fast path is to allow only + * 32-bit inputs. Avoid zero inputs to avoid + * negative zero issues (-1 * 0 = -0, for instance). + */ + if (v1 >= DUK_I64_CONSTANT(-0x80000000) && v1 <= DUK_I64_CONSTANT(0x7fffffff) && v1 != 0 && + v2 >= DUK_I64_CONSTANT(-0x80000000) && v2 <= DUK_I64_CONSTANT(0x7fffffff) && v2 != 0) { + v3 = v1 * v2; + } else { + goto skip_fastint; + } + break; + } + case DUK_OP_DIV >> 2: { + /* Don't allow a zero divisor. Fast path check by + * "verifying" with multiplication. Also avoid zero + * dividend to avoid negative zero issues (0 / -1 = -0 + * for instance). + */ + if (v1 == 0 || v2 == 0) { + goto skip_fastint; + } + v3 = v1 / v2; + if (v3 * v2 != v1) { + goto skip_fastint; + } + break; + } + case DUK_OP_MOD >> 2: { + /* Don't allow a zero divisor. Restrict both v1 and + * v2 to positive values to avoid compiler specific + * behavior. + */ + if (v1 < 1 || v2 < 1) { + goto skip_fastint; + } + v3 = v1 % v2; + DUK_ASSERT(v3 >= 0); + DUK_ASSERT(v3 < v2); + DUK_ASSERT(v1 - (v1 / v2) * v2 == v3); + break; + } + default: { + /* Possible with DUK_OP_EXP. */ + goto skip_fastint; + } + } + + v3_hi = (duk_int32_t) (v3 >> 32); + if (DUK_LIKELY(v3_hi >= DUK_I64_CONSTANT(-0x8000) && v3_hi <= DUK_I64_CONSTANT(0x7fff))) { + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, v3); /* side effects */ + return; + } + /* fall through if overflow etc */ + } + skip_fastint: +#endif /* DUK_USE_FASTINT */ + + if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) { + /* fast path */ + d1 = DUK_TVAL_GET_NUMBER(tv_x); + d2 = DUK_TVAL_GET_NUMBER(tv_y); + } else { + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + d1 = duk_to_number_m2(thr); /* side effects */ + d2 = duk_to_number_m1(thr); + DUK_ASSERT(duk_is_number(thr, -2)); + DUK_ASSERT(duk_is_number(thr, -1)); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d1); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2); + duk_pop_2_unsafe(thr); + } + + switch (opcode_shifted) { + case DUK_OP_SUB >> 2: { + du.d = d1 - d2; + break; + } + case DUK_OP_MUL >> 2: { + du.d = d1 * d2; + break; + } + case DUK_OP_DIV >> 2: { + /* Division-by-zero is undefined behavior, so + * rely on a helper. + */ + du.d = duk_double_div(d1, d2); + break; + } + case DUK_OP_MOD >> 2: { + du.d = duk__compute_mod(d1, d2); + break; + } +#if defined(DUK_USE_ES7_EXP_OPERATOR) + case DUK_OP_EXP >> 2: { + du.d = duk__compute_exp(d1, d2); + break; + } +#endif + default: { + DUK_UNREACHABLE(); + du.d = DUK_DOUBLE_NAN; /* should not happen */ + break; + } + } + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + duk_push_number(thr, du.d); /* will NaN normalize result */ + duk_replace(thr, (duk_idx_t) idx_z); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + /* important to use normalized NaN with 8-byte tagged types */ + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, du.d); /* side effects */ +#endif /* DUK_USE_EXEC_PREFER_SIZE */ +} + +DUK_LOCAL DUK__INLINE_PERF void duk__vm_bitwise_binary_op(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_fast_t idx_z, duk_small_uint_fast_t opcode) { + /* + * Binary bitwise operations use different coercions (ToInt32, ToUint32) + * depending on the operation. We coerce the arguments first using + * ToInt32(), and then cast to an 32-bit value if necessary. Note that + * such casts must be correct even if there is no native 32-bit type + * (e.g., duk_int32_t and duk_uint32_t are 64-bit). + * + * E5 Sections 11.10, 11.7.1, 11.7.2, 11.7.3 + */ + + duk_int32_t i1, i2, i3; + duk_uint32_t u1, u2, u3; +#if defined(DUK_USE_FASTINT) + duk_int64_t fi3; +#else + duk_double_t d3; +#endif + duk_small_uint_fast_t opcode_shifted; +#if defined(DUK_USE_FASTINT) || !defined(DUK_USE_EXEC_PREFER_SIZE) + duk_tval *tv_z; +#endif + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_y != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(thr)); + + opcode_shifted = opcode >> 2; /* Get base opcode without reg/const modifiers. */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + i1 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_x); + i2 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_y); + } + else +#endif /* DUK_USE_FASTINT */ + { + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + i1 = duk_to_int32(thr, -2); + i2 = duk_to_int32(thr, -1); + duk_pop_2_unsafe(thr); + } + + switch (opcode_shifted) { + case DUK_OP_BAND >> 2: { + i3 = i1 & i2; + break; + } + case DUK_OP_BOR >> 2: { + i3 = i1 | i2; + break; + } + case DUK_OP_BXOR >> 2: { + i3 = i1 ^ i2; + break; + } + case DUK_OP_BASL >> 2: { + /* Signed shift, named "arithmetic" (asl) because the result + * is signed, e.g. 4294967295 << 1 -> -2. Note that result + * must be masked. + */ + + u2 = ((duk_uint32_t) i2) & 0xffffffffUL; + i3 = (duk_int32_t) (((duk_uint32_t) i1) << (u2 & 0x1fUL)); /* E5 Section 11.7.1, steps 7 and 8 */ + i3 = i3 & ((duk_int32_t) 0xffffffffUL); /* Note: left shift, should mask */ + break; + } + case DUK_OP_BASR >> 2: { + /* signed shift */ + + u2 = ((duk_uint32_t) i2) & 0xffffffffUL; + i3 = i1 >> (u2 & 0x1fUL); /* E5 Section 11.7.2, steps 7 and 8 */ + break; + } + case DUK_OP_BLSR >> 2: { + /* unsigned shift */ + + u1 = ((duk_uint32_t) i1) & 0xffffffffUL; + u2 = ((duk_uint32_t) i2) & 0xffffffffUL; + + /* special result value handling */ + u3 = u1 >> (u2 & 0x1fUL); /* E5 Section 11.7.2, steps 7 and 8 */ +#if defined(DUK_USE_FASTINT) + fi3 = (duk_int64_t) u3; + goto fastint_result_set; +#else + d3 = (duk_double_t) u3; + goto result_set; +#endif + } + default: { + DUK_UNREACHABLE(); + i3 = 0; /* should not happen */ + break; + } + } + +#if defined(DUK_USE_FASTINT) + /* Result is always fastint compatible. */ + /* XXX: Set 32-bit result (but must then handle signed and + * unsigned results separately). + */ + fi3 = (duk_int64_t) i3; + + fastint_result_set: + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, fi3); /* side effects */ +#else /* DUK_USE_FASTINT */ + d3 = (duk_double_t) i3; + + result_set: + DUK_ASSERT(!DUK_ISNAN(d3)); /* 'd3' is never NaN, so no need to normalize */ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d3); /* always normalized */ + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + duk_push_number(thr, d3); /* would NaN normalize result, but unnecessary */ + duk_replace(thr, (duk_idx_t) idx_z); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, d3); /* side effects */ +#endif /* DUK_USE_EXEC_PREFER_SIZE */ +#endif /* DUK_USE_FASTINT */ +} + +/* In-place unary operation. */ +DUK_LOCAL DUK__INLINE_PERF void duk__vm_arith_unary_op(duk_hthread *thr, duk_uint_fast_t idx_src, duk_uint_fast_t idx_dst, duk_small_uint_fast_t opcode) { + /* + * Arithmetic operations other than '+' have number-only semantics + * and are implemented here. The separate switch-case here means a + * "double dispatch" of the arithmetic opcode, but saves code space. + * + * E5 Sections 11.5, 11.5.1, 11.5.2, 11.5.3, 11.6, 11.6.1, 11.6.2, 11.6.3. + */ + + duk_tval *tv; + duk_double_t d1; + duk_double_union du; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(opcode == DUK_OP_UNM || opcode == DUK_OP_UNP); + DUK_ASSERT_DISABLE(idx_src >= 0); + DUK_ASSERT_DISABLE(idx_dst >= 0); + + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_src); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + duk_int64_t v1, v2; + + v1 = DUK_TVAL_GET_FASTINT(tv); + if (opcode == DUK_OP_UNM) { + /* The smallest fastint is no longer 48-bit when + * negated. Positive zero becames negative zero + * (cannot be represented) when negated. + */ + if (DUK_LIKELY(v1 != DUK_FASTINT_MIN && v1 != 0)) { + v2 = -v1; + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst); + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv, v2); + return; + } + } else { + /* ToNumber() for a fastint is a no-op. */ + DUK_ASSERT(opcode == DUK_OP_UNP); + v2 = v1; + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst); + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv, v2); + return; + } + /* fall through if overflow etc */ + } +#endif /* DUK_USE_FASTINT */ + + if (DUK_TVAL_IS_NUMBER(tv)) { + d1 = DUK_TVAL_GET_NUMBER(tv); + } else { + d1 = duk_to_number_tval(thr, tv); /* side effects */ + } + + if (opcode == DUK_OP_UNP) { + /* ToNumber() for a double is a no-op, but unary plus is + * used to force a fastint check so do that here. + */ + du.d = d1; + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); +#if defined(DUK_USE_FASTINT) + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst); + DUK_TVAL_SET_NUMBER_CHKFAST_UPDREF(thr, tv, du.d); /* always 'fast', i.e. inlined */ + return; +#endif + } else { + DUK_ASSERT(opcode == DUK_OP_UNM); + du.d = -d1; + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); /* mandatory if du.d is a NaN */ + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + } + + /* XXX: size optimize: push+replace? */ + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst); + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv, du.d); +} + +DUK_LOCAL DUK__INLINE_PERF void duk__vm_bitwise_not(duk_hthread *thr, duk_uint_fast_t idx_src, duk_uint_fast_t idx_dst) { + /* + * E5 Section 11.4.8 + */ + + duk_tval *tv; + duk_int32_t i1, i2; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT_DISABLE(idx_src >= 0); + DUK_ASSERT_DISABLE(idx_dst >= 0); + DUK_ASSERT((duk_uint_t) idx_src < (duk_uint_t) duk_get_top(thr)); + DUK_ASSERT((duk_uint_t) idx_dst < (duk_uint_t) duk_get_top(thr)); + + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_src); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + i1 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv); + } + else +#endif /* DUK_USE_FASTINT */ + { + duk_push_tval(thr, tv); + i1 = duk_to_int32(thr, -1); /* side effects */ + duk_pop_unsafe(thr); + } + + /* Result is always fastint compatible. */ + i2 = ~i1; + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst); + DUK_TVAL_SET_I32_UPDREF(thr, tv, i2); /* side effects */ +} + +DUK_LOCAL DUK__INLINE_PERF void duk__vm_logical_not(duk_hthread *thr, duk_uint_fast_t idx_src, duk_uint_fast_t idx_dst) { + /* + * E5 Section 11.4.9 + */ + + duk_tval *tv; + duk_bool_t res; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT_DISABLE(idx_src >= 0); + DUK_ASSERT_DISABLE(idx_dst >= 0); + DUK_ASSERT((duk_uint_t) idx_src < (duk_uint_t) duk_get_top(thr)); + DUK_ASSERT((duk_uint_t) idx_dst < (duk_uint_t) duk_get_top(thr)); + + /* ToBoolean() does not require any operations with side effects so + * we can do it efficiently. For footprint it would be better to use + * duk_js_toboolean() and then push+replace to the result slot. + */ + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_src); + res = duk_js_toboolean(tv); /* does not modify 'tv' */ + DUK_ASSERT(res == 0 || res == 1); + res ^= 1; + tv = DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst); + /* XXX: size optimize: push+replace? */ + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv, res); /* side effects */ +} + +/* XXX: size optimized variant */ +DUK_LOCAL DUK__INLINE_PERF void duk__prepost_incdec_reg_helper(duk_hthread *thr, duk_tval *tv_dst, duk_tval *tv_src, duk_small_uint_t op) { + duk_double_t x, y, z; + + /* Two lowest bits of opcode are used to distinguish + * variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1). + */ + DUK_ASSERT((DUK_OP_PREINCR & 0x03) == 0x00); + DUK_ASSERT((DUK_OP_PREDECR & 0x03) == 0x01); + DUK_ASSERT((DUK_OP_POSTINCR & 0x03) == 0x02); + DUK_ASSERT((DUK_OP_POSTDECR & 0x03) == 0x03); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_src)) { + duk_int64_t x_fi, y_fi, z_fi; + x_fi = DUK_TVAL_GET_FASTINT(tv_src); + if (op & 0x01) { + if (DUK_UNLIKELY(x_fi == DUK_FASTINT_MIN)) { + goto skip_fastint; + } + y_fi = x_fi - 1; + } else { + if (DUK_UNLIKELY(x_fi == DUK_FASTINT_MAX)) { + goto skip_fastint; + } + y_fi = x_fi + 1; + } + + DUK_TVAL_SET_FASTINT(tv_src, y_fi); /* no need for refcount update */ + + z_fi = (op & 0x02) ? x_fi : y_fi; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_dst, z_fi); /* side effects */ + return; + } + skip_fastint: +#endif + if (DUK_TVAL_IS_NUMBER(tv_src)) { + /* Fast path for the case where the register + * is a number (e.g. loop counter). + */ + + x = DUK_TVAL_GET_NUMBER(tv_src); + if (op & 0x01) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + DUK_TVAL_SET_NUMBER(tv_src, y); /* no need for refcount update */ + } else { + /* Preserve duk_tval pointer(s) across a potential valstack + * resize by converting them into offsets temporarily. + */ + duk_idx_t bc; + duk_size_t off_dst; + + off_dst = (duk_size_t) ((duk_uint8_t *) tv_dst - (duk_uint8_t *) thr->valstack_bottom); + bc = (duk_idx_t) (tv_src - thr->valstack_bottom); /* XXX: pass index explicitly? */ + tv_src = NULL; /* no longer referenced */ + + x = duk_to_number(thr, bc); + if (op & 0x01) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + duk_push_number(thr, y); + duk_replace(thr, bc); + + tv_dst = (duk_tval *) (void *) (((duk_uint8_t *) thr->valstack_bottom) + off_dst); + } + + z = (op & 0x02) ? x : y; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_dst, z); /* side effects */ +} + +DUK_LOCAL DUK__INLINE_PERF void duk__prepost_incdec_var_helper(duk_hthread *thr, duk_small_uint_t idx_dst, duk_tval *tv_id, duk_small_uint_t op, duk_small_uint_t is_strict) { + duk_activation *act; + duk_double_t x, y; + duk_hstring *name; + + /* XXX: The pre/post inc/dec for an identifier lookup is + * missing the important fast path where the identifier + * has a storage location e.g. in a scope object so that + * it can be updated in-place. In particular, the case + * where the identifier has a storage location AND the + * previous value is a number should be optimized because + * it's side effect free. + */ + + /* Two lowest bits of opcode are used to distinguish + * variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1). + */ + DUK_ASSERT((DUK_OP_PREINCV & 0x03) == 0x00); + DUK_ASSERT((DUK_OP_PREDECV & 0x03) == 0x01); + DUK_ASSERT((DUK_OP_POSTINCV & 0x03) == 0x02); + DUK_ASSERT((DUK_OP_POSTDECV & 0x03) == 0x03); + + DUK_ASSERT(DUK_TVAL_IS_STRING(tv_id)); + name = DUK_TVAL_GET_STRING(tv_id); + DUK_ASSERT(name != NULL); + act = thr->callstack_curr; + (void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [ ... val this ] */ + + /* XXX: Fastint fast path would be useful here. Also fastints + * now lose their fastint status in current handling which is + * not intuitive. + */ + + x = duk_to_number_m2(thr); + if (op & 0x01) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + /* [... x this] */ + + if (op & 0x02) { + duk_push_number(thr, y); /* -> [ ... x this y ] */ + DUK_ASSERT(act == thr->callstack_curr); + duk_js_putvar_activation(thr, act, name, DUK_GET_TVAL_NEGIDX(thr, -1), is_strict); + duk_pop_2_unsafe(thr); /* -> [ ... x ] */ + } else { + duk_pop_2_unsafe(thr); /* -> [ ... ] */ + duk_push_number(thr, y); /* -> [ ... y ] */ + DUK_ASSERT(act == thr->callstack_curr); + duk_js_putvar_activation(thr, act, name, DUK_GET_TVAL_NEGIDX(thr, -1), is_strict); + } + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + duk_replace(thr, (duk_idx_t) idx_dst); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + DUK__REPLACE_TO_TVPTR(thr, DUK_GET_TVAL_POSIDX(thr, (duk_idx_t) idx_dst)); +#endif /* DUK_USE_EXEC_PREFER_SIZE */ +} + +/* + * Longjmp and other control flow transfer for the bytecode executor. + * + * The longjmp handler can handle all longjmp types: error, yield, and + * resume (pseudotypes are never actually thrown). + * + * Error policy for longjmp: should not ordinarily throw errors; if errors + * occur (e.g. due to out-of-memory) they bubble outwards rather than being + * handled recursively. + */ + +#define DUK__LONGJMP_RESTART 0 /* state updated, restart bytecode execution */ +#define DUK__LONGJMP_RETHROW 1 /* exit bytecode executor by rethrowing an error to caller */ + +#define DUK__RETHAND_RESTART 0 /* state updated, restart bytecode execution */ +#define DUK__RETHAND_FINISHED 1 /* exit bytecode execution with return value */ + +/* XXX: optimize reconfig valstack operations so that resize, clamp, and setting + * top are combined into one pass. + */ + +/* Reconfigure value stack for return to an ECMAScript function at + * callstack top (caller unwinds). + */ +DUK_LOCAL void duk__reconfig_valstack_ecma_return(duk_hthread *thr) { + duk_activation *act; + duk_hcompfunc *h_func; + duk_idx_t clamp_top; + + DUK_ASSERT(thr != NULL); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(act))); + + /* Clamp so that values at 'clamp_top' and above are wiped and won't + * retain reachable garbage. Then extend to 'nregs' because we're + * returning to an ECMAScript function. + */ + + h_func = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + + thr->valstack_bottom = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + act->bottom_byteoff); + DUK_ASSERT(act->retval_byteoff >= act->bottom_byteoff); + clamp_top = (duk_idx_t) ((act->retval_byteoff - act->bottom_byteoff + sizeof(duk_tval)) / sizeof(duk_tval)); /* +1 = one retval */ + duk_set_top_and_wipe(thr, h_func->nregs, clamp_top); + + DUK_ASSERT((duk_uint8_t *) thr->valstack_end >= (duk_uint8_t *) thr->valstack + act->reserve_byteoff); + thr->valstack_end = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + act->reserve_byteoff); + + /* XXX: a best effort shrink check would be OK here */ +} + +/* Reconfigure value stack for an ECMAScript catcher. Use topmost catcher + * in 'act'. + */ +DUK_LOCAL void duk__reconfig_valstack_ecma_catcher(duk_hthread *thr, duk_activation *act) { + duk_catcher *cat; + duk_hcompfunc *h_func; + duk_size_t idx_bottom; + duk_idx_t clamp_top; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(act))); + cat = act->cat; + DUK_ASSERT(cat != NULL); + + h_func = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + + thr->valstack_bottom = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + act->bottom_byteoff); + idx_bottom = (duk_size_t) (thr->valstack_bottom - thr->valstack); + DUK_ASSERT(cat->idx_base >= idx_bottom); + clamp_top = (duk_idx_t) (cat->idx_base - idx_bottom + 2); /* +2 = catcher value, catcher lj_type */ + duk_set_top_and_wipe(thr, h_func->nregs, clamp_top); + + DUK_ASSERT((duk_uint8_t *) thr->valstack_end >= (duk_uint8_t *) thr->valstack + act->reserve_byteoff); + thr->valstack_end = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + act->reserve_byteoff); + + /* XXX: a best effort shrink check would be OK here */ +} + +/* Set catcher regs: idx_base+0 = value, idx_base+1 = lj_type. + * No side effects. + */ +DUK_LOCAL void duk__set_catcher_regs_norz(duk_hthread *thr, duk_catcher *cat, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) { + duk_tval *tv1; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + + tv1 = thr->valstack + cat->idx_base; + DUK_ASSERT(tv1 < thr->valstack_top); + DUK_TVAL_SET_TVAL_UPDREF_NORZ(thr, tv1, tv_val_unstable); + + tv1++; + DUK_ASSERT(tv1 == thr->valstack + cat->idx_base + 1); + DUK_ASSERT(tv1 < thr->valstack_top); + DUK_TVAL_SET_U32_UPDREF_NORZ(thr, tv1, (duk_uint32_t) lj_type); +} + +DUK_LOCAL void duk__handle_catch(duk_hthread *thr, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) { + duk_activation *act; + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + DUK_ASSERT(act->cat != NULL); + DUK_ASSERT(DUK_CAT_GET_TYPE(act->cat) == DUK_CAT_TYPE_TCF); + + duk__set_catcher_regs_norz(thr, act->cat, tv_val_unstable, lj_type); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr))); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + duk__reconfig_valstack_ecma_catcher(thr, act); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + cat = act->cat; + DUK_ASSERT(cat != NULL); + + act->curr_pc = cat->pc_base + 0; /* +0 = catch */ + + /* + * If entering a 'catch' block which requires an automatic + * catch variable binding, create the lexical environment. + * + * The binding is mutable (= writable) but not deletable. + * Step 4 for the catch production in E5 Section 12.14; + * no value is given for CreateMutableBinding 'D' argument, + * which implies the binding is not deletable. + */ + + if (DUK_CAT_HAS_CATCH_BINDING_ENABLED(cat)) { + duk_hdecenv *new_env; + + DUK_DDD(DUK_DDDPRINT("catcher has an automatic catch binding")); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + + if (act->lex_env == NULL) { + DUK_ASSERT(act->var_env == NULL); + DUK_DDD(DUK_DDDPRINT("delayed environment initialization")); + + duk_js_init_activation_environment_records_delayed(thr, act); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL); + + /* XXX: If an out-of-memory happens here, longjmp state asserts + * will be triggered at present and a try-catch fails to catch. + * That's not sandboxing fatal (C API protected calls are what + * matters), and script catch code can immediately throw anyway + * for almost any operation. + */ + new_env = duk_hdecenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV)); + DUK_ASSERT(new_env != NULL); + duk_push_hobject(thr, (duk_hobject *) new_env); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) new_env) == NULL); + DUK_DDD(DUK_DDDPRINT("new_env allocated: %!iO", (duk_heaphdr *) new_env)); + + /* Note: currently the catch binding is handled without a register + * binding because we don't support dynamic register bindings (they + * must be fixed for an entire function). So, there is no need to + * record regbases etc. + */ + + /* XXX: duk_xdef_prop() may cause an out-of-memory, see above. */ + DUK_ASSERT(cat->h_varname != NULL); + duk_push_hstring(thr, cat->h_varname); + duk_push_tval(thr, thr->valstack + cat->idx_base); + duk_xdef_prop(thr, -3, DUK_PROPDESC_FLAGS_W); /* writable, not configurable */ + + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *) new_env, act->lex_env); + act->lex_env = (duk_hobject *) new_env; + DUK_HOBJECT_INCREF(thr, (duk_hobject *) new_env); /* reachable through activation */ + /* Net refcount change to act->lex_env is 0: incref for new_env's + * prototype, decref for act->lex_env overwrite. + */ + + DUK_CAT_SET_LEXENV_ACTIVE(cat); + + duk_pop_unsafe(thr); + + DUK_DDD(DUK_DDDPRINT("new_env finished: %!iO", (duk_heaphdr *) new_env)); + } + + DUK_CAT_CLEAR_CATCH_ENABLED(cat); +} + +DUK_LOCAL void duk__handle_finally(duk_hthread *thr, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) { + duk_activation *act; + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + DUK_ASSERT(act->cat != NULL); + DUK_ASSERT(DUK_CAT_GET_TYPE(act->cat) == DUK_CAT_TYPE_TCF); + + duk__set_catcher_regs_norz(thr, act->cat, tv_val_unstable, lj_type); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr))); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + duk__reconfig_valstack_ecma_catcher(thr, act); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + cat = act->cat; + DUK_ASSERT(cat != NULL); + + act->curr_pc = cat->pc_base + 1; /* +1 = finally */ + + DUK_CAT_CLEAR_FINALLY_ENABLED(cat); +} + +DUK_LOCAL void duk__handle_label(duk_hthread *thr, duk_small_uint_t lj_type) { + duk_activation *act; + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(DUK_ACT_GET_FUNC(act))); + + /* +0 = break, +1 = continue */ + cat = act->cat; + DUK_ASSERT(cat != NULL); + DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_LABEL); + + act->curr_pc = cat->pc_base + (lj_type == DUK_LJ_TYPE_CONTINUE ? 1 : 0); + + /* valstack should not need changes */ +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) == + (duk_size_t) ((duk_hcompfunc *) DUK_ACT_GET_FUNC(act))->nregs); +#endif +} + +/* Called for handling both a longjmp() with type DUK_LJ_TYPE_YIELD and + * when a RETURN opcode terminates a thread and yields to the resumer. + * Caller unwinds so that top of callstack is the activation we return to. + */ +#if defined(DUK_USE_COROUTINE_SUPPORT) +DUK_LOCAL void duk__handle_yield(duk_hthread *thr, duk_hthread *resumer, duk_tval *tv_val_unstable) { + duk_activation *act_resumer; + duk_tval *tv1; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(resumer != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + act_resumer = resumer->callstack_curr; + DUK_ASSERT(act_resumer != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(act_resumer) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(act_resumer))); /* resume caller must be an ECMAScript func */ + + tv1 = (duk_tval *) (void *) ((duk_uint8_t *) resumer->valstack + act_resumer->retval_byteoff); /* return value from Duktape.Thread.resume() */ + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv_val_unstable); /* side effects */ /* XXX: avoid side effects */ + + duk__reconfig_valstack_ecma_return(resumer); + + /* caller must change active thread, and set thr->resumer to NULL */ +} +#endif /* DUK_USE_COROUTINE_SUPPORT */ + +DUK_LOCAL duk_small_uint_t duk__handle_longjmp(duk_hthread *thr, duk_activation *entry_act) { + duk_small_uint_t retval = DUK__LONGJMP_RESTART; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(entry_act != NULL); + + /* 'thr' is the current thread, as no-one resumes except us and we + * switch 'thr' in that case. + */ + DUK_ASSERT(thr == thr->heap->curr_thread); + + /* + * (Re)try handling the longjmp. + * + * A longjmp handler may convert the longjmp to a different type and + * "virtually" rethrow by goto'ing to 'check_longjmp'. Before the goto, + * the following must be updated: + * - the heap 'lj' state + * - 'thr' must reflect the "throwing" thread + */ + + check_longjmp: + + DUK_DD(DUK_DDPRINT("handling longjmp: type=%ld, value1=%!T, value2=%!T, iserror=%ld", + (long) thr->heap->lj.type, + (duk_tval *) &thr->heap->lj.value1, + (duk_tval *) &thr->heap->lj.value2, + (long) thr->heap->lj.iserror)); + + switch (thr->heap->lj.type) { + +#if defined(DUK_USE_COROUTINE_SUPPORT) + case DUK_LJ_TYPE_RESUME: { + /* + * Note: lj.value1 is 'value', lj.value2 is 'resumee'. + * This differs from YIELD. + */ + + duk_tval *tv; + duk_tval *tv2; + duk_hthread *resumee; + + /* duk_bi_duk_object_yield() and duk_bi_duk_object_resume() ensure all of these are met */ + + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); /* unchanged by Duktape.Thread.resume() */ + DUK_ASSERT(thr->callstack_top >= 2); /* ECMAScript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL && + DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr)) && + ((duk_hnatfunc *) DUK_ACT_GET_FUNC(thr->callstack_curr))->func == duk_bi_thread_resume); + + tv = &thr->heap->lj.value2; /* resumee */ + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); + DUK_ASSERT(DUK_TVAL_GET_OBJECT(tv) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_THREAD(DUK_TVAL_GET_OBJECT(tv))); + resumee = (duk_hthread *) DUK_TVAL_GET_OBJECT(tv); + + DUK_ASSERT(resumee != NULL); + DUK_ASSERT(resumee->resumer == NULL); + DUK_ASSERT(resumee->state == DUK_HTHREAD_STATE_INACTIVE || + resumee->state == DUK_HTHREAD_STATE_YIELDED); /* checked by Duktape.Thread.resume() */ + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED || + resumee->callstack_top >= 2); /* YIELDED: ECMAScript activation + Duktape.Thread.yield() activation */ + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED || + (DUK_ACT_GET_FUNC(resumee->callstack_curr) != NULL && + DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(resumee->callstack_curr)) && + ((duk_hnatfunc *) DUK_ACT_GET_FUNC(resumee->callstack_curr))->func == duk_bi_thread_yield)); + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_INACTIVE || + resumee->callstack_top == 0); /* INACTIVE: no activation, single function value on valstack */ + + if (thr->heap->lj.iserror) { + /* + * Throw the error in the resumed thread's context; the + * error value is pushed onto the resumee valstack. + * + * Note: the callstack of the target may empty in this case + * too (i.e. the target thread has never been resumed). The + * value stack will contain the initial function in that case, + * which we simply ignore. + */ + + DUK_ASSERT(resumee->resumer == NULL); + resumee->resumer = thr; + DUK_HTHREAD_INCREF(thr, thr); + resumee->state = DUK_HTHREAD_STATE_RUNNING; + thr->state = DUK_HTHREAD_STATE_RESUMED; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumee); + thr = resumee; + + thr->heap->lj.type = DUK_LJ_TYPE_THROW; + + /* thr->heap->lj.value1 is already the value to throw */ + /* thr->heap->lj.value2 is 'thread', will be wiped out at the end */ + + DUK_ASSERT(thr->heap->lj.iserror); /* already set */ + + DUK_DD(DUK_DDPRINT("-> resume with an error, converted to a throw in the resumee, propagate")); + goto check_longjmp; + } else if (resumee->state == DUK_HTHREAD_STATE_YIELDED) { + /* Unwind previous Duktape.Thread.yield() call. The + * activation remaining must always be an ECMAScript + * call now (yield() accepts calls from ECMAScript + * only). + */ + duk_activation *act_resumee; + + DUK_ASSERT(resumee->callstack_top >= 2); + act_resumee = resumee->callstack_curr; /* Duktape.Thread.yield() */ + DUK_ASSERT(act_resumee != NULL); + act_resumee = act_resumee->parent; /* ECMAScript call site for yield() */ + DUK_ASSERT(act_resumee != NULL); + + tv = (duk_tval *) (void *) ((duk_uint8_t *) resumee->valstack + act_resumee->retval_byteoff); /* return value from Duktape.Thread.yield() */ + DUK_ASSERT(tv >= resumee->valstack && tv < resumee->valstack_top); + tv2 = &thr->heap->lj.value1; + DUK_TVAL_SET_TVAL_UPDREF(thr, tv, tv2); /* side effects */ /* XXX: avoid side effects */ + + duk_hthread_activation_unwind_norz(resumee); /* unwind to 'yield' caller */ + /* no need to unwind catch stack */ + + duk__reconfig_valstack_ecma_return(resumee); + + DUK_ASSERT(resumee->resumer == NULL); + resumee->resumer = thr; + DUK_HTHREAD_INCREF(thr, thr); + resumee->state = DUK_HTHREAD_STATE_RUNNING; + thr->state = DUK_HTHREAD_STATE_RESUMED; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumee); +#if 0 + thr = resumee; /* not needed, as we exit right away */ +#endif + DUK_DD(DUK_DDPRINT("-> resume with a value, restart execution in resumee")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } else { + /* Initial resume call. */ + duk_small_uint_t call_flags; + duk_int_t setup_rc; + + /* resumee: [... initial_func] (currently actually: [initial_func]) */ + + duk_push_undefined(resumee); + tv = &thr->heap->lj.value1; + duk_push_tval(resumee, tv); + + /* resumee: [... initial_func undefined(= this) resume_value ] */ + + call_flags = DUK_CALL_FLAG_ALLOW_ECMATOECMA; /* not tailcall, ecma-to-ecma (assumed to succeed) */ + + setup_rc = duk_handle_call_unprotected_nargs(resumee, 1 /*nargs*/, call_flags); + if (setup_rc == 0) { + /* This shouldn't happen; Duktape.Thread.resume() + * should make sure of that. If it does happen + * this internal error will propagate out of the + * executor which can be quite misleading. + */ + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); + } + + DUK_ASSERT(resumee->resumer == NULL); + resumee->resumer = thr; + DUK_HTHREAD_INCREF(thr, thr); + resumee->state = DUK_HTHREAD_STATE_RUNNING; + thr->state = DUK_HTHREAD_STATE_RESUMED; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumee); +#if 0 + thr = resumee; /* not needed, as we exit right away */ +#endif + DUK_DD(DUK_DDPRINT("-> resume with a value, restart execution in resumee")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + DUK_UNREACHABLE(); + break; /* never here */ + } + + case DUK_LJ_TYPE_YIELD: { + /* + * Currently only allowed only if yielding thread has only + * ECMAScript activations (except for the Duktape.Thread.yield() + * call at the callstack top) and none of them constructor + * calls. + * + * This excludes the 'entry' thread which will always have + * a preventcount > 0. + */ + + duk_hthread *resumer; + + /* duk_bi_duk_object_yield() and duk_bi_duk_object_resume() ensure all of these are met */ + +#if 0 /* entry_thread not available for assert */ + DUK_ASSERT(thr != entry_thread); /* Duktape.Thread.yield() should prevent */ +#endif + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); /* unchanged from Duktape.Thread.yield() */ + DUK_ASSERT(thr->callstack_top >= 2); /* ECMAScript activation + Duktape.Thread.yield() activation */ + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL && + DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr)) && + ((duk_hnatfunc *) DUK_ACT_GET_FUNC(thr->callstack_curr))->func == duk_bi_thread_yield); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr->parent) != NULL && + DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr->parent))); /* an ECMAScript function */ + + resumer = thr->resumer; + + DUK_ASSERT(resumer != NULL); + DUK_ASSERT(resumer->state == DUK_HTHREAD_STATE_RESUMED); /* written by a previous RESUME handling */ + DUK_ASSERT(resumer->callstack_top >= 2); /* ECMAScript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(resumer->callstack_curr != NULL); + DUK_ASSERT(resumer->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack_curr) != NULL && + DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(resumer->callstack_curr)) && + ((duk_hnatfunc *) DUK_ACT_GET_FUNC(resumer->callstack_curr))->func == duk_bi_thread_resume); + DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack_curr->parent) != NULL && + DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(resumer->callstack_curr->parent))); /* an ECMAScript function */ + + if (thr->heap->lj.iserror) { + thr->state = DUK_HTHREAD_STATE_YIELDED; + thr->resumer = NULL; + DUK_HTHREAD_DECREF_NORZ(thr, resumer); + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); + thr = resumer; + + thr->heap->lj.type = DUK_LJ_TYPE_THROW; + /* lj.value1 is already set */ + DUK_ASSERT(thr->heap->lj.iserror); /* already set */ + + DUK_DD(DUK_DDPRINT("-> yield an error, converted to a throw in the resumer, propagate")); + goto check_longjmp; + } else { + duk_hthread_activation_unwind_norz(resumer); + duk__handle_yield(thr, resumer, &thr->heap->lj.value1); + + thr->state = DUK_HTHREAD_STATE_YIELDED; + thr->resumer = NULL; + DUK_HTHREAD_DECREF_NORZ(thr, resumer); + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); +#if 0 + thr = resumer; /* not needed, as we exit right away */ +#endif + + DUK_DD(DUK_DDPRINT("-> yield a value, restart execution in resumer")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + DUK_UNREACHABLE(); + break; /* never here */ + } +#endif /* DUK_USE_COROUTINE_SUPPORT */ + + case DUK_LJ_TYPE_THROW: { + /* + * Three possible outcomes: + * * A try or finally catcher is found => resume there. + * (or) + * * The error propagates to the bytecode executor entry + * level (and we're in the entry thread) => rethrow + * with a new longjmp(), after restoring the previous + * catchpoint. + * * The error is not caught in the current thread, so + * the thread finishes with an error. This works like + * a yielded error, except that the thread is finished + * and can no longer be resumed. (There is always a + * resumer in this case.) + * + * Note: until we hit the entry level, there can only be + * ECMAScript activations. + */ + + duk_activation *act; + duk_catcher *cat; + duk_hthread *resumer; + + for (;;) { + act = thr->callstack_curr; + if (act == NULL) { + break; + } + + for (;;) { + cat = act->cat; + if (cat == NULL) { + break; + } + + if (DUK_CAT_HAS_CATCH_ENABLED(cat)) { + DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF); + + duk__handle_catch(thr, + &thr->heap->lj.value1, + DUK_LJ_TYPE_THROW); + + DUK_DD(DUK_DDPRINT("-> throw caught by a 'catch' clause, restart execution")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + + if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF); + DUK_ASSERT(!DUK_CAT_HAS_CATCH_ENABLED(cat)); + + duk__handle_finally(thr, + &thr->heap->lj.value1, + DUK_LJ_TYPE_THROW); + + DUK_DD(DUK_DDPRINT("-> throw caught by a 'finally' clause, restart execution")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + + duk_hthread_catcher_unwind_norz(thr, act); + } + + if (act == entry_act) { + /* Not caught by anything before entry level; rethrow and let the + * final catcher finish unwinding (esp. value stack). + */ + DUK_D(DUK_DPRINT("-> throw propagated up to entry level, rethrow and exit bytecode executor")); + retval = DUK__LONGJMP_RETHROW; + goto just_return; + } + + duk_hthread_activation_unwind_norz(thr); + } + + DUK_DD(DUK_DDPRINT("-> throw not caught by current thread, yield error to resumer and recheck longjmp")); + + /* Not caught by current thread, thread terminates (yield error to resumer); + * note that this may cause a cascade if the resumer terminates with an uncaught + * exception etc (this is OK, but needs careful testing). + */ + + DUK_ASSERT(thr->resumer != NULL); + DUK_ASSERT(thr->resumer->callstack_top >= 2); /* ECMAScript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(thr->resumer->callstack_curr != NULL); + DUK_ASSERT(thr->resumer->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack_curr->parent) != NULL && + DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->resumer->callstack_curr->parent))); /* an ECMAScript function */ + + resumer = thr->resumer; + + /* reset longjmp */ + + DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_THROW); /* already set */ + /* lj.value1 already set */ + + duk_hthread_terminate(thr); /* updates thread state, minimizes its allocations */ + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_TERMINATED); + + thr->resumer = NULL; + DUK_HTHREAD_DECREF_NORZ(thr, resumer); + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); + thr = resumer; + goto check_longjmp; + } + + case DUK_LJ_TYPE_BREAK: /* pseudotypes, not used in actual longjmps */ + case DUK_LJ_TYPE_CONTINUE: + case DUK_LJ_TYPE_RETURN: + case DUK_LJ_TYPE_NORMAL: + default: { + /* should never happen, but be robust */ + DUK_D(DUK_DPRINT("caught unknown longjmp type %ld, treat as internal error", (long) thr->heap->lj.type)); + goto convert_to_internal_error; + } + + } /* end switch */ + + DUK_UNREACHABLE(); + + wipe_and_return: + /* this is not strictly necessary, but helps debugging */ + thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN; + thr->heap->lj.iserror = 0; + + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value1); /* side effects */ + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value2); /* side effects */ + + DUK_GC_TORTURE(thr->heap); + + just_return: + return retval; + + convert_to_internal_error: + /* This could also be thrown internally (set the error, goto check_longjmp), + * but it's better for internal errors to bubble outwards so that we won't + * infinite loop in this catchpoint. + */ + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); +} + +/* Handle a BREAK/CONTINUE opcode. Avoid using longjmp() for BREAK/CONTINUE + * handling because it has a measurable performance impact in ordinary + * environments and an extreme impact in Emscripten (GH-342). + */ +DUK_LOCAL DUK__NOINLINE_PERF void duk__handle_break_or_continue(duk_hthread *thr, + duk_uint_t label_id, + duk_small_uint_t lj_type) { + duk_activation *act; + duk_catcher *cat; + + DUK_ASSERT(thr != NULL); + + /* Find a matching label catcher or 'finally' catcher in + * the same function, unwinding catchers as we go. + * + * A label catcher must always exist and will match unless + * a 'finally' captures the break/continue first. It is the + * compiler's responsibility to ensure that labels are used + * correctly. + */ + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + + for (;;) { + cat = act->cat; + if (cat == NULL) { + break; + } + + DUK_DDD(DUK_DDDPRINT("considering catcher %p: type=%ld label=%ld", + (void *) cat, + (long) DUK_CAT_GET_TYPE(cat), + (long) DUK_CAT_GET_LABEL(cat))); + + /* XXX: bit mask test; FINALLY <-> TCF, single bit mask would suffice? */ + + if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF && + DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + duk_tval tv_tmp; + + DUK_TVAL_SET_U32(&tv_tmp, (duk_uint32_t) label_id); + duk__handle_finally(thr, &tv_tmp, lj_type); + + DUK_DD(DUK_DDPRINT("-> break/continue caught by 'finally', restart execution")); + return; + } + if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_LABEL && + (duk_uint_t) DUK_CAT_GET_LABEL(cat) == label_id) { + duk__handle_label(thr, lj_type); + + DUK_DD(DUK_DDPRINT("-> break/continue caught by a label catcher (in the same function), restart execution")); + return; + } + + duk_hthread_catcher_unwind_norz(thr, act); + } + + /* Should never happen, but be robust. */ + DUK_D(DUK_DPRINT("-> break/continue not caught by anything in the current function (should never happen), throw internal error")); + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return;); +} + +/* Handle a RETURN opcode. Avoid using longjmp() for return handling because + * it has a measurable performance impact in ordinary environments and an extreme + * impact in Emscripten (GH-342). Return value is on value stack top. + */ +DUK_LOCAL duk_small_uint_t duk__handle_return(duk_hthread *thr, duk_activation *entry_act) { + duk_tval *tv1; + duk_tval *tv2; +#if defined(DUK_USE_COROUTINE_SUPPORT) + duk_hthread *resumer; +#endif + duk_activation *act; + duk_catcher *cat; + + /* We can directly access value stack here. */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(entry_act != NULL); + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + tv1 = thr->valstack_top - 1; + DUK_TVAL_CHKFAST_INPLACE_FAST(tv1); /* fastint downgrade check for return values */ + + /* + * Four possible outcomes: + * + * 1. A 'finally' in the same function catches the 'return'. + * It may continue to propagate when 'finally' is finished, + * or it may be neutralized by 'finally' (both handled by + * ENDFIN). + * + * 2. The return happens at the entry level of the bytecode + * executor, so return from the executor (in C stack). + * + * 3. There is a calling (ECMAScript) activation in the call + * stack => return to it, in the same executor instance. + * + * 4. There is no calling activation, and the thread is + * terminated. There is always a resumer in this case, + * which gets the return value similarly to a 'yield' + * (except that the current thread can no longer be + * resumed). + */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->callstack_top >= 1); + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + + for (;;) { + cat = act->cat; + if (cat == NULL) { + break; + } + + if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF && + DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + duk__handle_finally(thr, thr->valstack_top - 1, DUK_LJ_TYPE_RETURN); + + DUK_DD(DUK_DDPRINT("-> return caught by 'finally', restart execution")); + return DUK__RETHAND_RESTART; + } + + duk_hthread_catcher_unwind_norz(thr, act); + } + + if (act == entry_act) { + /* Return to the bytecode executor caller who will unwind stacks + * and handle constructor post-processing. + * Return value is already on the stack top: [ ... retval ]. + */ + + DUK_DDD(DUK_DDDPRINT("-> return propagated up to entry level, exit bytecode executor")); + return DUK__RETHAND_FINISHED; + } + + if (thr->callstack_top >= 2) { + /* There is a caller; it MUST be an ECMAScript caller (otherwise it would + * match entry_act check). + */ + DUK_DDD(DUK_DDDPRINT("return to ECMAScript caller, retval_byteoff=%ld, lj_value1=%!T", + (long) (thr->callstack_curr->parent->retval_byteoff), + (duk_tval *) &thr->heap->lj.value1)); + + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(thr->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr->parent))); /* must be ECMAScript */ + +#if defined(DUK_USE_ES6_PROXY) + if (thr->callstack_curr->flags & (DUK_ACT_FLAG_CONSTRUCT | DUK_ACT_FLAG_CONSTRUCT_PROXY)) { + duk_call_construct_postprocess(thr, thr->callstack_curr->flags & DUK_ACT_FLAG_CONSTRUCT_PROXY); /* side effects */ + } +#else + if (thr->callstack_curr->flags & DUK_ACT_FLAG_CONSTRUCT) { + duk_call_construct_postprocess(thr, 0); /* side effects */ + } +#endif + + tv1 = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + thr->callstack_curr->parent->retval_byteoff); + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + tv2 = thr->valstack_top - 1; + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects */ + + /* Catch stack unwind happens inline in callstack unwind. */ + duk_hthread_activation_unwind_norz(thr); + + duk__reconfig_valstack_ecma_return(thr); + + DUK_DD(DUK_DDPRINT("-> return not intercepted, restart execution in caller")); + return DUK__RETHAND_RESTART; + } + +#if defined(DUK_USE_COROUTINE_SUPPORT) + DUK_DD(DUK_DDPRINT("no calling activation, thread finishes (similar to yield)")); + + DUK_ASSERT(thr->resumer != NULL); + DUK_ASSERT(thr->resumer->callstack_top >= 2); /* ECMAScript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(thr->resumer->callstack_curr != NULL); + DUK_ASSERT(thr->resumer->callstack_curr->parent != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack_curr) != NULL && + DUK_HOBJECT_IS_NATFUNC(DUK_ACT_GET_FUNC(thr->resumer->callstack_curr)) && + ((duk_hnatfunc *) DUK_ACT_GET_FUNC(thr->resumer->callstack_curr))->func == duk_bi_thread_resume); /* Duktape.Thread.resume() */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack_curr->parent) != NULL && + DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->resumer->callstack_curr->parent))); /* an ECMAScript function */ + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); + DUK_ASSERT(thr->resumer->state == DUK_HTHREAD_STATE_RESUMED); + + resumer = thr->resumer; + + /* Share yield longjmp handler. + * + * This sequence of steps is a bit fragile (see GH-1845): + * - We need the return value from 'thr' (resumed thread) value stack. + * The termination unwinds its value stack, losing the value. + * - We need a refcounted reference for 'thr', which may only exist + * in the caller value stack. We can't unwind or reconfigure the + * caller's value stack without potentially freeing 'thr'. + * + * Current approach is to capture the 'thr' return value and store + * a reference to 'thr' in the caller value stack temporarily. This + * keeps 'thr' reachable until final yield/return handling which + * removes the references atomatically. + */ + + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + duk_hthread_activation_unwind_norz(resumer); /* May remove last reference to 'thr', but is NORZ. */ + duk_push_tval(resumer, thr->valstack_top - 1); /* Capture return value, side effect free. */ + duk_push_hthread(resumer, thr); /* Make 'thr' reachable again, before side effects. */ + + duk_hthread_terminate(thr); /* Updates thread state, minimizes its allocations. */ + thr->resumer = NULL; + DUK_HTHREAD_DECREF(thr, resumer); + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_TERMINATED); + + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); + + DUK_ASSERT(resumer->valstack_top - 2 >= resumer->valstack_bottom); + duk__handle_yield(thr, resumer, resumer->valstack_top - 2); + thr = NULL; /* 'thr' invalidated by call */ + +#if 0 + thr = resumer; /* not needed */ +#endif + + DUK_DD(DUK_DDPRINT("-> return not caught, thread terminated; handle like yield, restart execution in resumer")); + return DUK__RETHAND_RESTART; +#else + /* Without coroutine support this case should never happen. */ + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return 0;); +#endif +} + +/* + * Executor interrupt handling + * + * The handler is called whenever the interrupt countdown reaches zero + * (or below). The handler must perform whatever checks are activated, + * e.g. check for cumulative step count to impose an execution step + * limit or check for breakpoints or other debugger interaction. + * + * When the actions are done, the handler must reinit the interrupt + * init and counter values. The 'init' value must indicate how many + * bytecode instructions are executed before the next interrupt. The + * counter must interface with the bytecode executor loop. Concretely, + * the new init value is normally one higher than the new counter value. + * For instance, to execute exactly one bytecode instruction the init + * value is set to 1 and the counter to 0. If an error is thrown by the + * interrupt handler, the counters are set to the same value (e.g. both + * to 0 to cause an interrupt when the next bytecode instruction is about + * to be executed after error handling). + * + * Maintaining the init/counter value properly is important for accurate + * behavior. For instance, executor step limit needs a cumulative step + * count which is simply computed as a sum of 'init' values. This must + * work accurately even when single stepping. + */ + +#if defined(DUK_USE_INTERRUPT_COUNTER) + +#define DUK__INT_NOACTION 0 /* no specific action, resume normal execution */ +#define DUK__INT_RESTART 1 /* must "goto restart_execution", e.g. breakpoints changed */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_LOCAL void duk__interrupt_handle_debugger(duk_hthread *thr, duk_bool_t *out_immediate, duk_small_uint_t *out_interrupt_retval) { + duk_activation *act; + duk_breakpoint *bp; + duk_breakpoint **bp_active; + duk_uint_fast32_t line = 0; + duk_bool_t process_messages; + duk_bool_t processed_messages = 0; + + DUK_ASSERT(thr->heap->dbg_processing == 0); /* don't re-enter e.g. during Eval */ + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + + /* It might seem that replacing 'thr->heap' with just 'heap' below + * might be a good idea, but it increases code size slightly + * (probably due to unnecessary spilling) at least on x64. + */ + + /* + * Single opcode step check + */ + + if (thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_ONE_OPCODE_ACTIVE) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by one opcode step")); + duk_debug_set_paused(thr->heap); + } + + /* + * Breakpoint and step state checks + */ + + if (act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE || + (thr->heap->dbg_pause_act == thr->callstack_curr)) { + line = duk_debug_curr_line(thr); + + if (act->prev_line != line) { + /* Stepped? Step out is handled by callstack unwind. */ + if ((thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_LINE_CHANGE) && + (thr->heap->dbg_pause_act == thr->callstack_curr) && + (line != thr->heap->dbg_pause_startline)) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by line change, at line %ld", + (long) line)); + duk_debug_set_paused(thr->heap); + } + + /* Check for breakpoints only on line transition. + * Breakpoint is triggered when we enter the target + * line from a different line, and the previous line + * was within the same function. + * + * This condition is tricky: the condition used to be + * that transition to -or across- the breakpoint line + * triggered the breakpoint. This seems intuitively + * better because it handles breakpoints on lines with + * no emitted opcodes; but this leads to the issue + * described in: https://github.com/svaarala/duktape/issues/263. + */ + bp_active = thr->heap->dbg_breakpoints_active; + for (;;) { + bp = *bp_active++; + if (bp == NULL) { + break; + } + + DUK_ASSERT(bp->filename != NULL); + if (act->prev_line != bp->line && line == bp->line) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by breakpoint at %!O:%ld", + (duk_heaphdr *) bp->filename, (long) bp->line)); + duk_debug_set_paused(thr->heap); + } + } + } else { + ; + } + + act->prev_line = (duk_uint32_t) line; + } + + /* + * Rate limit check for sending status update or peeking into + * the debug transport. Both can be expensive operations that + * we don't want to do on every opcode. + * + * Making sure the interval remains reasonable on a wide variety + * of targets and bytecode is difficult without a timestamp, so + * we use a Date-provided timestamp for the rate limit check. + * But since it's also expensive to get a timestamp, a bytecode + * counter is used to rate limit getting timestamps. + */ + + process_messages = 0; + if (thr->heap->dbg_state_dirty || DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) || thr->heap->dbg_detaching) { + /* Enter message processing loop for sending Status notifys and + * to finish a pending detach. + */ + process_messages = 1; + } + + /* XXX: remove heap->dbg_exec_counter, use heap->inst_count_interrupt instead? */ + DUK_ASSERT(thr->interrupt_init >= 0); + thr->heap->dbg_exec_counter += (duk_uint_t) thr->interrupt_init; + if (thr->heap->dbg_exec_counter - thr->heap->dbg_last_counter >= DUK_HEAP_DBG_RATELIMIT_OPCODES) { + /* Overflow of the execution counter is fine and doesn't break + * anything here. + */ + + duk_double_t now, diff_last; + + thr->heap->dbg_last_counter = thr->heap->dbg_exec_counter; + now = duk_time_get_monotonic_time(thr); + + diff_last = now - thr->heap->dbg_last_time; + if (diff_last < 0.0 || diff_last >= (duk_double_t) DUK_HEAP_DBG_RATELIMIT_MILLISECS) { + /* Monotonic time should not experience time jumps, + * but the provider may be missing and we're actually + * using ECMAScript time. So, tolerate negative values + * so that a time jump works reasonably. + * + * Same interval is now used for status sending and + * peeking. + */ + + thr->heap->dbg_last_time = now; + thr->heap->dbg_state_dirty = 1; + process_messages = 1; + } + } + + /* + * Process messages and send status if necessary. + * + * If we're paused, we'll block for new messages. If we're not + * paused, we'll process anything we can peek but won't block + * for more. Detach (and re-attach) handling is all localized + * to duk_debug_process_messages() too. + * + * Debugger writes outside the message loop may cause debugger + * detach1 phase to run, after which dbg_read_cb == NULL and + * dbg_detaching != 0. The message loop will finish the detach + * by running detach2 phase, so enter the message loop also when + * detaching. + */ + + if (process_messages) { + DUK_ASSERT(thr->heap->dbg_processing == 0); + processed_messages = duk_debug_process_messages(thr, 0 /*no_block*/); + DUK_ASSERT(thr->heap->dbg_processing == 0); + } + + /* Continue checked execution if there are breakpoints or we're stepping. + * Also use checked execution if paused flag is active - it shouldn't be + * because the debug message loop shouldn't terminate if it was. Step out + * is handled by callstack unwind and doesn't need checked execution. + * Note that debugger may have detached due to error or explicit request + * above, so we must recheck attach status. + */ + + if (duk_debug_is_attached(thr->heap)) { + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + if (act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE || + (thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_ONE_OPCODE) || + ((thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_LINE_CHANGE) && + thr->heap->dbg_pause_act == thr->callstack_curr) || + DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap)) { + *out_immediate = 1; + } + + /* If we processed any debug messages breakpoints may have + * changed; restart execution to re-check active breakpoints. + */ + if (processed_messages) { + DUK_D(DUK_DPRINT("processed debug messages, restart execution to recheck possibly changed breakpoints")); + *out_interrupt_retval = DUK__INT_RESTART; + } else { + if (thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_ONE_OPCODE) { + /* Set 'pause after one opcode' active only when we're + * actually just about to execute code. + */ + thr->heap->dbg_pause_flags |= DUK_PAUSE_FLAG_ONE_OPCODE_ACTIVE; + } + } + } else { + DUK_D(DUK_DPRINT("debugger became detached, resume normal execution")); + } +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +DUK_LOCAL DUK__NOINLINE_PERF DUK_COLD duk_small_uint_t duk__executor_interrupt(duk_hthread *thr) { + duk_int_t ctr; + duk_activation *act; + duk_hcompfunc *fun; + duk_bool_t immediate = 0; + duk_small_uint_t retval; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(thr->callstack_top > 0); + +#if defined(DUK_USE_DEBUG) + thr->heap->inst_count_interrupt += thr->interrupt_init; + DUK_DD(DUK_DDPRINT("execution interrupt, counter=%ld, init=%ld, " + "instruction counts: executor=%ld, interrupt=%ld", + (long) thr->interrupt_counter, (long) thr->interrupt_init, + (long) thr->heap->inst_count_exec, (long) thr->heap->inst_count_interrupt)); +#endif + + retval = DUK__INT_NOACTION; + ctr = DUK_HTHREAD_INTCTR_DEFAULT; + + /* + * Avoid nested calls. Concretely this happens during debugging, e.g. + * when we eval() an expression. + * + * Also don't interrupt if we're currently doing debug processing + * (which can be initiated outside the bytecode executor) as this + * may cause the debugger to be called recursively. Check required + * for correct operation of throw intercept and other "exotic" halting + * scenarios. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (DUK_HEAP_HAS_INTERRUPT_RUNNING(thr->heap) || thr->heap->dbg_processing) { +#else + if (DUK_HEAP_HAS_INTERRUPT_RUNNING(thr->heap)) { +#endif + DUK_DD(DUK_DDPRINT("nested executor interrupt, ignoring")); + + /* Set a high interrupt counter; the original executor + * interrupt invocation will rewrite before exiting. + */ + thr->interrupt_init = ctr; + thr->interrupt_counter = ctr - 1; + return DUK__INT_NOACTION; + } + DUK_HEAP_SET_INTERRUPT_RUNNING(thr->heap); + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + + fun = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC((duk_hobject *) fun)); + + DUK_UNREF(fun); + +#if defined(DUK_USE_EXEC_TIMEOUT_CHECK) + /* + * Execution timeout check + */ + + if (DUK_USE_EXEC_TIMEOUT_CHECK(thr->heap->heap_udata)) { + /* Keep throwing an error whenever we get here. The unusual values + * are set this way because no instruction is ever executed, we just + * throw an error until all try/catch/finally and other catchpoints + * have been exhausted. Duktape/C code gets control at each protected + * call but whenever it enters back into Duktape the RangeError gets + * raised. User exec timeout check must consistently indicate a timeout + * until we've fully bubbled out of Duktape. + */ + DUK_D(DUK_DPRINT("execution timeout, throwing a RangeError")); + thr->interrupt_init = 0; + thr->interrupt_counter = 0; + DUK_HEAP_CLEAR_INTERRUPT_RUNNING(thr->heap); + DUK_ERROR_RANGE(thr, "execution timeout"); + DUK_WO_NORETURN(return 0;); + } +#endif /* DUK_USE_EXEC_TIMEOUT_CHECK */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (!thr->heap->dbg_processing && + (thr->heap->dbg_read_cb != NULL || thr->heap->dbg_detaching)) { + /* Avoid recursive re-entry; enter when we're attached or + * detaching (to finish off the pending detach). + */ + duk__interrupt_handle_debugger(thr, &immediate, &retval); + DUK_ASSERT(act == thr->callstack_curr); + } +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + + /* + * Update the interrupt counter + */ + + if (immediate) { + /* Cause an interrupt after executing one instruction. */ + ctr = 1; + } + + /* The counter value is one less than the init value: init value should + * indicate how many instructions are executed before interrupt. To + * execute 1 instruction (after interrupt handler return), counter must + * be 0. + */ + DUK_ASSERT(ctr >= 1); + thr->interrupt_init = ctr; + thr->interrupt_counter = ctr - 1; + DUK_HEAP_CLEAR_INTERRUPT_RUNNING(thr->heap); + + return retval; +} +#endif /* DUK_USE_INTERRUPT_COUNTER */ + +/* + * Debugger handling for executor restart + * + * Check for breakpoints, stepping, etc, and figure out if we should execute + * in checked or normal mode. Note that we can't do this when an activation + * is created, because breakpoint status (and stepping status) may change + * later, so we must recheck every time we're executing an activation. + * This primitive should be side effect free to avoid changes during check. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_LOCAL void duk__executor_recheck_debugger(duk_hthread *thr, duk_activation *act, duk_hcompfunc *fun) { + duk_heap *heap; + duk_tval *tv_tmp; + duk_hstring *filename; + duk_small_uint_t bp_idx; + duk_breakpoint **bp_active; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(fun != NULL); + + heap = thr->heap; + bp_active = heap->dbg_breakpoints_active; + act->flags &= ~DUK_ACT_FLAG_BREAKPOINT_ACTIVE; + + tv_tmp = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) fun, DUK_HTHREAD_STRING_FILE_NAME(thr)); + if (tv_tmp && DUK_TVAL_IS_STRING(tv_tmp)) { + filename = DUK_TVAL_GET_STRING(tv_tmp); + + /* Figure out all active breakpoints. A breakpoint is + * considered active if the current function's fileName + * matches the breakpoint's fileName, AND there is no + * inner function that has matching line numbers + * (otherwise a breakpoint would be triggered both + * inside and outside of the inner function which would + * be confusing). Example: + * + * function foo() { + * print('foo'); + * function bar() { <-. breakpoints in these + * print('bar'); | lines should not affect + * } <-' foo() execution + * bar(); + * } + * + * We need a few things that are only available when + * debugger support is enabled: (1) a line range for + * each function, and (2) access to the function + * template to access the inner functions (and their + * line ranges). + * + * It's important to have a narrow match for active + * breakpoints so that we don't enter checked execution + * when that's not necessary. For instance, if we're + * running inside a certain function and there's + * breakpoint outside in (after the call site), we + * don't want to slow down execution of the function. + */ + + for (bp_idx = 0; bp_idx < heap->dbg_breakpoint_count; bp_idx++) { + duk_breakpoint *bp = heap->dbg_breakpoints + bp_idx; + duk_hobject **funcs, **funcs_end; + duk_hcompfunc *inner_fun; + duk_bool_t bp_match; + + if (bp->filename == filename && + bp->line >= fun->start_line && bp->line <= fun->end_line) { + bp_match = 1; + DUK_DD(DUK_DDPRINT("breakpoint filename and line match: " + "%s:%ld vs. %s (line %ld vs. %ld-%ld)", + DUK_HSTRING_GET_DATA(bp->filename), + (long) bp->line, + DUK_HSTRING_GET_DATA(filename), + (long) bp->line, + (long) fun->start_line, + (long) fun->end_line)); + + funcs = DUK_HCOMPFUNC_GET_FUNCS_BASE(thr->heap, fun); + funcs_end = DUK_HCOMPFUNC_GET_FUNCS_END(thr->heap, fun); + while (funcs != funcs_end) { + inner_fun = (duk_hcompfunc *) *funcs; + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) inner_fun)); + if (bp->line >= inner_fun->start_line && bp->line <= inner_fun->end_line) { + DUK_DD(DUK_DDPRINT("inner function masks ('captures') breakpoint")); + bp_match = 0; + break; + } + funcs++; + } + + if (bp_match) { + /* No need to check for size of bp_active list, + * it's always larger than maximum number of + * breakpoints. + */ + act->flags |= DUK_ACT_FLAG_BREAKPOINT_ACTIVE; + *bp_active = heap->dbg_breakpoints + bp_idx; + bp_active++; + } + } + } + } + + *bp_active = NULL; /* terminate */ + + DUK_DD(DUK_DDPRINT("ACTIVE BREAKPOINTS: %ld", (long) (bp_active - thr->heap->dbg_breakpoints_active))); + + /* Force pause if we were doing "step into" in another activation. */ + if ((thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_FUNC_ENTRY) && + thr->heap->dbg_pause_act != thr->callstack_curr) { + DUK_D(DUK_DPRINT("PAUSE TRIGGERED by function entry")); + duk_debug_set_paused(thr->heap); + } + + /* Force interrupt right away if we're paused or in "checked mode". + * Step out is handled by callstack unwind. + */ + if ((act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE) || + DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) || + ((thr->heap->dbg_pause_flags & DUK_PAUSE_FLAG_LINE_CHANGE) && + thr->heap->dbg_pause_act == thr->callstack_curr)) { + /* We'll need to interrupt early so recompute the init + * counter to reflect the number of bytecode instructions + * executed so that step counts for e.g. debugger rate + * limiting are accurate. + */ + DUK_ASSERT(thr->interrupt_counter <= thr->interrupt_init); + thr->interrupt_init = thr->interrupt_init - thr->interrupt_counter; + thr->interrupt_counter = 0; + } +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +/* + * Opcode handlers for opcodes with a lot of code and which are relatively + * rare; NOINLINE to reduce amount of code in main bytecode dispatcher. + */ + +DUK_LOCAL DUK__NOINLINE_PERF void duk__handle_op_initset_initget(duk_hthread *thr, duk_uint_fast32_t ins) { + duk_bool_t is_set = (DUK_DEC_OP(ins) == DUK_OP_INITSET); + duk_uint_fast_t idx; + duk_uint_t defprop_flags; + + /* A -> object register (acts as a source) + * BC -> BC+0 contains key, BC+1 closure (value) + */ + + /* INITSET/INITGET are only used to initialize object literal keys. + * There may be a previous propery in ES2015 because duplicate property + * names are allowed. + */ + + /* This could be made more optimal by accessing internals directly. */ + + idx = (duk_uint_fast_t) DUK_DEC_BC(ins); + duk_dup(thr, (duk_idx_t) (idx + 0)); /* key */ + duk_dup(thr, (duk_idx_t) (idx + 1)); /* getter/setter */ + if (is_set) { + defprop_flags = DUK_DEFPROP_HAVE_SETTER | + DUK_DEFPROP_FORCE | + DUK_DEFPROP_SET_ENUMERABLE | + DUK_DEFPROP_SET_CONFIGURABLE; + } else { + defprop_flags = DUK_DEFPROP_HAVE_GETTER | + DUK_DEFPROP_FORCE | + DUK_DEFPROP_SET_ENUMERABLE | + DUK_DEFPROP_SET_CONFIGURABLE; + } + duk_def_prop(thr, (duk_idx_t) DUK_DEC_A(ins), defprop_flags); +} + +DUK_LOCAL DUK__NOINLINE_PERF void duk__handle_op_trycatch(duk_hthread *thr, duk_uint_fast32_t ins, duk_instr_t *curr_pc) { + duk_activation *act; + duk_catcher *cat; + duk_tval *tv1; + duk_small_uint_fast_t a; + duk_small_uint_fast_t bc; + + /* A -> flags + * BC -> reg_catch; base register for two registers used both during + * trycatch setup and when catch is triggered + * + * If DUK_BC_TRYCATCH_FLAG_CATCH_BINDING set: + * reg_catch + 0: catch binding variable name (string). + * Automatic declarative environment is established for + * the duration of the 'catch' clause. + * + * If DUK_BC_TRYCATCH_FLAG_WITH_BINDING set: + * reg_catch + 0: with 'target value', which is coerced to + * an object and then used as a bindind object for an + * environment record. The binding is initialized here, for + * the 'try' clause. + * + * Note that a TRYCATCH generated for a 'with' statement has no + * catch or finally parts. + */ + + /* XXX: TRYCATCH handling should be reworked to avoid creating + * an explicit scope unless it is actually needed (e.g. function + * instances or eval is executed inside the catch block). This + * rework is not trivial because the compiler doesn't have an + * intermediate representation. When the rework is done, the + * opcode format can also be made more straightforward. + */ + + /* XXX: side effect handling is quite awkward here */ + + DUK_DDD(DUK_DDDPRINT("TRYCATCH: reg_catch=%ld, have_catch=%ld, " + "have_finally=%ld, catch_binding=%ld, with_binding=%ld (flags=0x%02lx)", + (long) DUK_DEC_BC(ins), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH ? 1 : 0), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY ? 1 : 0), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_CATCH_BINDING ? 1 : 0), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_WITH_BINDING ? 1 : 0), + (unsigned long) DUK_DEC_A(ins))); + + a = DUK_DEC_A(ins); + bc = DUK_DEC_BC(ins); + + /* Registers 'bc' and 'bc + 1' are written in longjmp handling + * and if their previous values (which are temporaries) become + * unreachable -and- have a finalizer, there'll be a function + * call during error handling which is not supported now (GH-287). + * Ensure that both 'bc' and 'bc + 1' have primitive values to + * guarantee no finalizer calls in error handling. Scrubbing also + * ensures finalizers for the previous values run here rather than + * later. Error handling related values are also written to 'bc' + * and 'bc + 1' but those values never become unreachable during + * error handling, so there's no side effect problem even if the + * error value has a finalizer. + */ + duk_dup(thr, (duk_idx_t) bc); /* Stabilize value. */ + duk_to_undefined(thr, (duk_idx_t) bc); + duk_to_undefined(thr, (duk_idx_t) (bc + 1)); + + /* Allocate catcher and populate it. Doesn't have to + * be fully atomic, but the catcher must be in a + * consistent state if side effects (such as finalizer + * calls) occur. + */ + + cat = duk_hthread_catcher_alloc(thr); + DUK_ASSERT(cat != NULL); + + cat->flags = DUK_CAT_TYPE_TCF; + cat->h_varname = NULL; + cat->pc_base = (duk_instr_t *) curr_pc; /* pre-incremented, points to first jump slot */ + cat->idx_base = (duk_size_t) (thr->valstack_bottom - thr->valstack) + bc; + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + cat->parent = act->cat; + act->cat = cat; + + if (a & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH) { + cat->flags |= DUK_CAT_FLAG_CATCH_ENABLED; + } + if (a & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY) { + cat->flags |= DUK_CAT_FLAG_FINALLY_ENABLED; + } + if (a & DUK_BC_TRYCATCH_FLAG_CATCH_BINDING) { + DUK_DDD(DUK_DDDPRINT("catch binding flag set to catcher")); + cat->flags |= DUK_CAT_FLAG_CATCH_BINDING_ENABLED; + tv1 = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + + /* borrowed reference; although 'tv1' comes from a register, + * its value was loaded using LDCONST so the constant will + * also exist and be reachable. + */ + cat->h_varname = DUK_TVAL_GET_STRING(tv1); + } else if (a & DUK_BC_TRYCATCH_FLAG_WITH_BINDING) { + duk_hobjenv *env; + duk_hobject *target; + + /* Delayed env initialization for activation (if needed). */ + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + if (act->lex_env == NULL) { + DUK_DDD(DUK_DDDPRINT("delayed environment initialization")); + DUK_ASSERT(act->var_env == NULL); + + duk_js_init_activation_environment_records_delayed(thr, act); + DUK_ASSERT(act == thr->callstack_curr); + DUK_UNREF(act); /* 'act' is no longer accessed, scanbuild fix */ + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + + /* Coerce 'with' target. */ + target = duk_to_hobject(thr, -1); + DUK_ASSERT(target != NULL); + + /* Create an object environment; it is not pushed + * so avoid side effects very carefully until it is + * referenced. + */ + env = duk_hobjenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJENV)); + DUK_ASSERT(env != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) env) == NULL); + env->target = target; /* always provideThis=true */ + DUK_HOBJECT_INCREF(thr, target); + env->has_this = 1; + DUK_ASSERT_HOBJENV_VALID(env); + DUK_DDD(DUK_DDDPRINT("environment for with binding: %!iO", env)); + + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) env) == NULL); + DUK_ASSERT(act->lex_env != NULL); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *) env, act->lex_env); + act->lex_env = (duk_hobject *) env; /* Now reachable. */ + DUK_HOBJECT_INCREF(thr, (duk_hobject *) env); + /* Net refcount change to act->lex_env is 0: incref for env's + * prototype, decref for act->lex_env overwrite. + */ + + /* Set catcher lex_env active (affects unwind) + * only when the whole setup is complete. + */ + cat = act->cat; /* XXX: better to relookup? not mandatory because 'cat' is stable */ + cat->flags |= DUK_CAT_FLAG_LEXENV_ACTIVE; + } else { + ; + } + + DUK_DDD(DUK_DDDPRINT("TRYCATCH catcher: flags=0x%08lx, pc_base=%ld, " + "idx_base=%ld, h_varname=%!O", + (unsigned long) cat->flags, + (long) cat->pc_base, (long) cat->idx_base, (duk_heaphdr *) cat->h_varname)); + + duk_pop_unsafe(thr); +} + +DUK_LOCAL DUK__NOINLINE_PERF duk_instr_t *duk__handle_op_endtry(duk_hthread *thr, duk_uint_fast32_t ins) { + duk_activation *act; + duk_catcher *cat; + duk_tval *tv1; + duk_instr_t *pc_base; + + DUK_UNREF(ins); + + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + cat = act->cat; + DUK_ASSERT(cat != NULL); + DUK_ASSERT(DUK_CAT_GET_TYPE(act->cat) == DUK_CAT_TYPE_TCF); + + DUK_DDD(DUK_DDDPRINT("ENDTRY: clearing catch active flag (regardless of whether it was set or not)")); + DUK_CAT_CLEAR_CATCH_ENABLED(cat); + + pc_base = cat->pc_base; + + if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_DDD(DUK_DDDPRINT("ENDTRY: finally part is active, jump through 2nd jump slot with 'normal continuation'")); + + tv1 = thr->valstack + cat->idx_base; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */ + tv1 = NULL; + + tv1 = thr->valstack + cat->idx_base + 1; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_U32_UPDREF(thr, tv1, (duk_uint32_t) DUK_LJ_TYPE_NORMAL); /* side effects */ + tv1 = NULL; + + DUK_CAT_CLEAR_FINALLY_ENABLED(cat); + } else { + DUK_DDD(DUK_DDDPRINT("ENDTRY: no finally part, dismantle catcher, jump through 2nd jump slot (to end of statement)")); + + duk_hthread_catcher_unwind_norz(thr, act); /* lexenv may be set for 'with' binding */ + /* no need to unwind callstack */ + } + + return pc_base + 1; /* new curr_pc value */ +} + +DUK_LOCAL DUK__NOINLINE_PERF duk_instr_t *duk__handle_op_endcatch(duk_hthread *thr, duk_uint_fast32_t ins) { + duk_activation *act; + duk_catcher *cat; + duk_tval *tv1; + duk_instr_t *pc_base; + + DUK_UNREF(ins); + + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + cat = act->cat; + DUK_ASSERT(cat != NULL); + DUK_ASSERT(!DUK_CAT_HAS_CATCH_ENABLED(cat)); /* cleared before entering catch part */ + + if (DUK_CAT_HAS_LEXENV_ACTIVE(cat)) { + duk_hobject *prev_env; + + /* 'with' binding has no catch clause, so can't be here unless a normal try-catch */ + DUK_ASSERT(DUK_CAT_HAS_CATCH_BINDING_ENABLED(cat)); + DUK_ASSERT(act->lex_env != NULL); + + DUK_DDD(DUK_DDDPRINT("ENDCATCH: popping catcher part lexical environment")); + + prev_env = act->lex_env; + DUK_ASSERT(prev_env != NULL); + act->lex_env = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, prev_env); + DUK_CAT_CLEAR_LEXENV_ACTIVE(cat); + DUK_HOBJECT_INCREF(thr, act->lex_env); + DUK_HOBJECT_DECREF(thr, prev_env); /* side effects */ + + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + } + + pc_base = cat->pc_base; + + if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_DDD(DUK_DDDPRINT("ENDCATCH: finally part is active, jump through 2nd jump slot with 'normal continuation'")); + + tv1 = thr->valstack + cat->idx_base; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */ + tv1 = NULL; + + tv1 = thr->valstack + cat->idx_base + 1; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_U32_UPDREF(thr, tv1, (duk_uint32_t) DUK_LJ_TYPE_NORMAL); /* side effects */ + tv1 = NULL; + + DUK_CAT_CLEAR_FINALLY_ENABLED(cat); + } else { + DUK_DDD(DUK_DDDPRINT("ENDCATCH: no finally part, dismantle catcher, jump through 2nd jump slot (to end of statement)")); + + duk_hthread_catcher_unwind_norz(thr, act); + /* no need to unwind callstack */ + } + + return pc_base + 1; /* new curr_pc value */ +} + +DUK_LOCAL DUK__NOINLINE_PERF duk_small_uint_t duk__handle_op_endfin(duk_hthread *thr, duk_uint_fast32_t ins, duk_activation *entry_act) { + duk_activation *act; + duk_tval *tv1; + duk_uint_t reg_catch; + duk_small_uint_t cont_type; + duk_small_uint_t ret_result; + + DUK_ASSERT(thr->ptr_curr_pc == NULL); + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + reg_catch = DUK_DEC_ABC(ins); + + /* CATCH flag may be enabled or disabled here; it may be enabled if + * the statement has a catch block but the try block does not throw + * an error. + */ + + DUK_DDD(DUK_DDDPRINT("ENDFIN: completion value=%!T, type=%!T", + (duk_tval *) (thr->valstack_bottom + reg_catch + 0), + (duk_tval *) (thr->valstack_bottom + reg_catch + 1))); + + tv1 = thr->valstack_bottom + reg_catch + 1; /* type */ + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1)); + cont_type = (duk_small_uint_t) DUK_TVAL_GET_FASTINT_U32(tv1); +#else + cont_type = (duk_small_uint_t) DUK_TVAL_GET_NUMBER(tv1); +#endif + + tv1--; /* value */ + + switch (cont_type) { + case DUK_LJ_TYPE_NORMAL: { + DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with 'normal' (non-abrupt) completion -> " + "dismantle catcher, resume execution after ENDFIN")); + + duk_hthread_catcher_unwind_norz(thr, act); + /* no need to unwind callstack */ + return 0; /* restart execution */ + } + case DUK_LJ_TYPE_RETURN: { + DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with 'return' complation -> dismantle " + "catcher, handle return, lj.value1=%!T", tv1)); + + /* Not necessary to unwind catch stack: return handling will + * do it. The finally flag of 'cat' is no longer set. The + * catch flag may be set, but it's not checked by return handling. + */ + + duk_push_tval(thr, tv1); + ret_result = duk__handle_return(thr, entry_act); + if (ret_result == DUK__RETHAND_RESTART) { + return 0; /* restart execution */ + } + DUK_ASSERT(ret_result == DUK__RETHAND_FINISHED); + + DUK_DDD(DUK_DDDPRINT("exiting executor after ENDFIN and RETURN (pseudo) longjmp type")); + return 1; /* exit executor */ + } + case DUK_LJ_TYPE_BREAK: + case DUK_LJ_TYPE_CONTINUE: { + duk_uint_t label_id; + duk_small_uint_t lj_type; + + /* Not necessary to unwind catch stack: break/continue + * handling will do it. The finally flag of 'cat' is + * no longer set. The catch flag may be set, but it's + * not checked by break/continue handling. + */ + + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1)); + label_id = (duk_small_uint_t) DUK_TVAL_GET_FASTINT_U32(tv1); +#else + label_id = (duk_small_uint_t) DUK_TVAL_GET_NUMBER(tv1); +#endif + lj_type = cont_type; + duk__handle_break_or_continue(thr, label_id, lj_type); + return 0; /* restart execution */ + } + default: { + DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with abrupt completion, lj_type=%ld -> " + "dismantle catcher, re-throw error", + (long) cont_type)); + + duk_err_setup_ljstate1(thr, (duk_small_uint_t) cont_type, tv1); + /* No debugger Throw notify check on purpose (rethrow). */ + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* always in executor */ + duk_err_longjmp(thr); + DUK_UNREACHABLE(); + } + } + + DUK_UNREACHABLE(); + return 0; +} + +DUK_LOCAL DUK__NOINLINE_PERF void duk__handle_op_initenum(duk_hthread *thr, duk_uint_fast32_t ins) { + duk_small_uint_t b; + duk_small_uint_t c; + + /* + * Enumeration semantics come from for-in statement, E5 Section 12.6.4. + * If called with 'null' or 'undefined', this opcode returns 'null' as + * the enumerator, which is special cased in NEXTENUM. This simplifies + * the compiler part + */ + + /* B -> register for writing enumerator object + * C -> value to be enumerated (register) + */ + b = DUK_DEC_B(ins); + c = DUK_DEC_C(ins); + + if (duk_is_null_or_undefined(thr, (duk_idx_t) c)) { + duk_push_null(thr); + duk_replace(thr, (duk_idx_t) b); + } else { + duk_dup(thr, (duk_idx_t) c); + duk_to_object(thr, -1); + duk_hobject_enumerator_create(thr, 0 /*enum_flags*/); /* [ ... val ] --> [ ... enum ] */ + duk_replace(thr, (duk_idx_t) b); + } +} + +DUK_LOCAL DUK__NOINLINE_PERF duk_small_uint_t duk__handle_op_nextenum(duk_hthread *thr, duk_uint_fast32_t ins) { + duk_small_uint_t b; + duk_small_uint_t c; + duk_small_uint_t pc_skip = 0; + + /* + * NEXTENUM checks whether the enumerator still has unenumerated + * keys. If so, the next key is loaded to the target register + * and the next instruction is skipped. Otherwise the next instruction + * will be executed, jumping out of the enumeration loop. + */ + + /* B -> target register for next key + * C -> enum register + */ + b = DUK_DEC_B(ins); + c = DUK_DEC_C(ins); + + DUK_DDD(DUK_DDDPRINT("NEXTENUM: b->%!T, c->%!T", + (duk_tval *) duk_get_tval(thr, (duk_idx_t) b), + (duk_tval *) duk_get_tval(thr, (duk_idx_t) c))); + + if (duk_is_object(thr, (duk_idx_t) c)) { + /* XXX: assert 'c' is an enumerator */ + duk_dup(thr, (duk_idx_t) c); + if (duk_hobject_enumerator_next(thr, 0 /*get_value*/)) { + /* [ ... enum ] -> [ ... next_key ] */ + DUK_DDD(DUK_DDDPRINT("enum active, next key is %!T, skip jump slot ", + (duk_tval *) duk_get_tval(thr, -1))); + pc_skip = 1; + } else { + /* [ ... enum ] -> [ ... ] */ + DUK_DDD(DUK_DDDPRINT("enum finished, execute jump slot")); + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); /* valstack policy */ + thr->valstack_top++; + } + duk_replace(thr, (duk_idx_t) b); + } else { + /* 'null' enumerator case -> behave as with an empty enumerator */ + DUK_ASSERT(duk_is_null(thr, (duk_idx_t) c)); + DUK_DDD(DUK_DDDPRINT("enum is null, execute jump slot")); + } + + return pc_skip; +} + +/* + * Call handling helpers. + */ + +DUK_LOCAL duk_bool_t duk__executor_handle_call(duk_hthread *thr, duk_idx_t idx, duk_idx_t nargs, duk_small_uint_t call_flags) { + duk_bool_t rc; + + duk_set_top_unsafe(thr, (duk_idx_t) (idx + nargs + 2)); /* [ ... func this arg1 ... argN ] */ + + /* Attempt an Ecma-to-Ecma call setup. If the call + * target is (directly or indirectly) Reflect.construct(), + * the call may change into a constructor call on the fly. + */ + rc = (duk_bool_t) duk_handle_call_unprotected(thr, idx, call_flags); + if (rc != 0) { + /* Ecma-to-ecma call possible, may or may not + * be a tail call. Avoid C recursion by + * reusing current executor instance. + */ + DUK_DDD(DUK_DDDPRINT("ecma-to-ecma call setup possible, restart execution")); + /* curr_pc synced by duk_handle_call_unprotected() */ + DUK_ASSERT(thr->ptr_curr_pc == NULL); + return rc; + } else { + /* Call was handled inline. */ + } + DUK_ASSERT(thr->ptr_curr_pc != NULL); + return rc; +} + +/* + * ECMAScript bytecode executor. + * + * Resume execution for the current thread from its current activation. + * Returns when execution would return from the entry level activation, + * leaving a single return value on top of the stack. Function calls + * and thread resumptions are handled internally. If an error occurs, + * a longjmp() with type DUK_LJ_TYPE_THROW is called on the entry level + * setjmp() jmpbuf. + * + * ECMAScript function calls and coroutine resumptions are handled + * internally (by the outer executor function) without recursive C calls. + * Other function calls are handled using duk_handle_call(), increasing + * C recursion depth. + * + * Abrupt completions (= long control tranfers) are handled either + * directly by reconfiguring relevant stacks and restarting execution, + * or via a longjmp. Longjmp-free handling is preferable for performance + * (especially Emscripten performance), and is used for: break, continue, + * and return. + * + * For more detailed notes, see doc/execution.rst. + * + * Also see doc/code-issues.rst for discussion of setjmp(), longjmp(), + * and volatile. + */ + +/* Presence of 'fun' is config based, there's a marginal performance + * difference and the best option is architecture dependent. + */ +#if defined(DUK_USE_EXEC_FUN_LOCAL) +#define DUK__FUN() fun +#else +#define DUK__FUN() ((duk_hcompfunc *) DUK_ACT_GET_FUNC((thr)->callstack_curr)) +#endif + +/* Strict flag. */ +#define DUK__STRICT() ((duk_small_uint_t) DUK_HOBJECT_HAS_STRICT((duk_hobject *) DUK__FUN())) + +/* Reg/const access macros: these are very footprint and performance sensitive + * so modify with care. Arguments are sometimes evaluated multiple times which + * is not ideal. + */ +#define DUK__REG(x) (*(thr->valstack_bottom + (x))) +#define DUK__REGP(x) (thr->valstack_bottom + (x)) +#define DUK__CONST(x) (*(consts + (x))) +#define DUK__CONSTP(x) (consts + (x)) + +/* Reg/const access macros which take the 32-bit instruction and avoid an + * explicit field decoding step by using shifts and masks. These must be + * kept in sync with duk_js_bytecode.h. The shift/mask values are chosen + * so that 'ins' can be shifted and masked and used as a -byte- offset + * instead of a duk_tval offset which needs further shifting (which is an + * issue on some, but not all, CPUs). + */ +#define DUK__RCBIT_B DUK_BC_REGCONST_B +#define DUK__RCBIT_C DUK_BC_REGCONST_C +#if defined(DUK_USE_EXEC_REGCONST_OPTIMIZE) +#if defined(DUK_USE_PACKED_TVAL) +#define DUK__TVAL_SHIFT 3 /* sizeof(duk_tval) == 8 */ +#else +#define DUK__TVAL_SHIFT 4 /* sizeof(duk_tval) == 16; not always the case so also asserted for */ +#endif +#define DUK__SHIFT_A (DUK_BC_SHIFT_A - DUK__TVAL_SHIFT) +#define DUK__SHIFT_B (DUK_BC_SHIFT_B - DUK__TVAL_SHIFT) +#define DUK__SHIFT_C (DUK_BC_SHIFT_C - DUK__TVAL_SHIFT) +#define DUK__SHIFT_BC (DUK_BC_SHIFT_BC - DUK__TVAL_SHIFT) +#define DUK__MASK_A (DUK_BC_UNSHIFTED_MASK_A << DUK__TVAL_SHIFT) +#define DUK__MASK_B (DUK_BC_UNSHIFTED_MASK_B << DUK__TVAL_SHIFT) +#define DUK__MASK_C (DUK_BC_UNSHIFTED_MASK_C << DUK__TVAL_SHIFT) +#define DUK__MASK_BC (DUK_BC_UNSHIFTED_MASK_BC << DUK__TVAL_SHIFT) +#define DUK__BYTEOFF_A(ins) (((ins) >> DUK__SHIFT_A) & DUK__MASK_A) +#define DUK__BYTEOFF_B(ins) (((ins) >> DUK__SHIFT_B) & DUK__MASK_B) +#define DUK__BYTEOFF_C(ins) (((ins) >> DUK__SHIFT_C) & DUK__MASK_C) +#define DUK__BYTEOFF_BC(ins) (((ins) >> DUK__SHIFT_BC) & DUK__MASK_BC) + +#define DUK__REGP_A(ins) ((duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_bottom + DUK__BYTEOFF_A((ins)))) +#define DUK__REGP_B(ins) ((duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_bottom + DUK__BYTEOFF_B((ins)))) +#define DUK__REGP_C(ins) ((duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_bottom + DUK__BYTEOFF_C((ins)))) +#define DUK__REGP_BC(ins) ((duk_tval *) (void *) ((duk_uint8_t *) thr->valstack_bottom + DUK__BYTEOFF_BC((ins)))) +#define DUK__CONSTP_A(ins) ((duk_tval *) (void *) ((duk_uint8_t *) consts + DUK__BYTEOFF_A((ins)))) +#define DUK__CONSTP_B(ins) ((duk_tval *) (void *) ((duk_uint8_t *) consts + DUK__BYTEOFF_B((ins)))) +#define DUK__CONSTP_C(ins) ((duk_tval *) (void *) ((duk_uint8_t *) consts + DUK__BYTEOFF_C((ins)))) +#define DUK__CONSTP_BC(ins) ((duk_tval *) (void *) ((duk_uint8_t *) consts + DUK__BYTEOFF_BC((ins)))) +#define DUK__REGCONSTP_B(ins) ((duk_tval *) (void *) ((duk_uint8_t *) (((ins) & DUK__RCBIT_B) ? consts : thr->valstack_bottom) + DUK__BYTEOFF_B((ins)))) +#define DUK__REGCONSTP_C(ins) ((duk_tval *) (void *) ((duk_uint8_t *) (((ins) & DUK__RCBIT_C) ? consts : thr->valstack_bottom) + DUK__BYTEOFF_C((ins)))) +#else /* DUK_USE_EXEC_REGCONST_OPTIMIZE */ +/* Safe alternatives, no assumption about duk_tval size. */ +#define DUK__REGP_A(ins) DUK__REGP(DUK_DEC_A((ins))) +#define DUK__REGP_B(ins) DUK__REGP(DUK_DEC_B((ins))) +#define DUK__REGP_C(ins) DUK__REGP(DUK_DEC_C((ins))) +#define DUK__REGP_BC(ins) DUK__REGP(DUK_DEC_BC((ins))) +#define DUK__CONSTP_A(ins) DUK__CONSTP(DUK_DEC_A((ins))) +#define DUK__CONSTP_B(ins) DUK__CONSTP(DUK_DEC_B((ins))) +#define DUK__CONSTP_C(ins) DUK__CONSTP(DUK_DEC_C((ins))) +#define DUK__CONSTP_BC(ins) DUK__CONSTP(DUK_DEC_BC((ins))) +#define DUK__REGCONSTP_B(ins) ((((ins) & DUK__RCBIT_B) ? consts : thr->valstack_bottom) + DUK_DEC_B((ins))) +#define DUK__REGCONSTP_C(ins) ((((ins) & DUK__RCBIT_C) ? consts : thr->valstack_bottom) + DUK_DEC_C((ins))) +#endif /* DUK_USE_EXEC_REGCONST_OPTIMIZE */ + +#if defined(DUK_USE_VERBOSE_EXECUTOR_ERRORS) +#define DUK__INTERNAL_ERROR(msg) do { \ + DUK_ERROR_ERROR(thr, (msg)); \ + DUK_WO_NORETURN(return;); \ + } while (0) +#else +#define DUK__INTERNAL_ERROR(msg) do { \ + goto internal_error; \ + } while (0) +#endif + +#define DUK__SYNC_CURR_PC() do { \ + duk_activation *duk__act; \ + duk__act = thr->callstack_curr; \ + duk__act->curr_pc = curr_pc; \ + } while (0) +#define DUK__SYNC_AND_NULL_CURR_PC() do { \ + duk_activation *duk__act; \ + duk__act = thr->callstack_curr; \ + duk__act->curr_pc = curr_pc; \ + thr->ptr_curr_pc = NULL; \ + } while (0) + +#if defined(DUK_USE_EXEC_PREFER_SIZE) +#define DUK__LOOKUP_INDIRECT(idx) do { \ + (idx) = (duk_uint_fast_t) duk_get_uint(thr, (duk_idx_t) (idx)); \ + } while (0) +#elif defined(DUK_USE_FASTINT) +#define DUK__LOOKUP_INDIRECT(idx) do { \ + duk_tval *tv_ind; \ + tv_ind = DUK__REGP((idx)); \ + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); \ + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv_ind)); /* compiler guarantees */ \ + (idx) = (duk_uint_fast_t) DUK_TVAL_GET_FASTINT_U32(tv_ind); \ + } while (0) +#else +#define DUK__LOOKUP_INDIRECT(idx) do { \ + duk_tval *tv_ind; \ + tv_ind = DUK__REGP(idx); \ + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); \ + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); \ + } while (0) +#endif + +DUK_LOCAL void duk__handle_executor_error(duk_heap *heap, + duk_activation *entry_act, + duk_int_t entry_call_recursion_depth, + duk_jmpbuf *entry_jmpbuf_ptr) { + duk_small_uint_t lj_ret; + + /* Longjmp callers are required to sync-and-null thr->ptr_curr_pc + * before longjmp. + */ + DUK_ASSERT(heap->curr_thread != NULL); + DUK_ASSERT(heap->curr_thread->ptr_curr_pc == NULL); + + /* XXX: signalling the need to shrink check (only if unwound) */ + + /* Must be restored here to handle e.g. yields properly. */ + heap->call_recursion_depth = entry_call_recursion_depth; + + /* Switch to caller's setjmp() catcher so that if an error occurs + * during error handling, it is always propagated outwards instead + * of causing an infinite loop in our own handler. + */ + heap->lj.jmpbuf_ptr = (duk_jmpbuf *) entry_jmpbuf_ptr; + + lj_ret = duk__handle_longjmp(heap->curr_thread, entry_act); + + /* Error handling complete, remove side effect protections. + */ +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(heap->error_not_allowed == 1); + heap->error_not_allowed = 0; +#endif + DUK_ASSERT(heap->pf_prevent_count > 0); + heap->pf_prevent_count--; + DUK_DD(DUK_DDPRINT("executor error handled, pf_prevent_count updated to %ld", (long) heap->pf_prevent_count)); + + if (lj_ret == DUK__LONGJMP_RESTART) { + /* Restart bytecode execution, possibly with a changed thread. */ + DUK_REFZERO_CHECK_SLOW(heap->curr_thread); + } else { + /* If an error is propagated, don't run refzero checks here. + * The next catcher will deal with that. Pf_prevent_count + * will be re-bumped by the longjmp. + */ + + DUK_ASSERT(lj_ret == DUK__LONGJMP_RETHROW); /* Rethrow error to calling state. */ + DUK_ASSERT(heap->lj.jmpbuf_ptr == entry_jmpbuf_ptr); /* Longjmp handling has restored jmpbuf_ptr. */ + + /* Thread may have changed, e.g. YIELD converted to THROW. */ + duk_err_longjmp(heap->curr_thread); + DUK_UNREACHABLE(); + } +} + +/* Outer executor with setjmp/longjmp handling. */ +DUK_INTERNAL void duk_js_execute_bytecode(duk_hthread *exec_thr) { + /* Entry level info. */ + duk_hthread *entry_thread; + duk_activation *entry_act; + duk_int_t entry_call_recursion_depth; + duk_jmpbuf *entry_jmpbuf_ptr; + duk_jmpbuf our_jmpbuf; + duk_heap *heap; + + DUK_ASSERT(exec_thr != NULL); + DUK_ASSERT(exec_thr->heap != NULL); + DUK_ASSERT(exec_thr->heap->curr_thread != NULL); + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR((duk_heaphdr *) exec_thr); + DUK_ASSERT(exec_thr->callstack_top >= 1); /* at least one activation, ours */ + DUK_ASSERT(exec_thr->callstack_curr != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(exec_thr->callstack_curr) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(exec_thr->callstack_curr))); + + DUK_GC_TORTURE(exec_thr->heap); + + entry_thread = exec_thr; + heap = entry_thread->heap; + entry_act = entry_thread->callstack_curr; + DUK_ASSERT(entry_act != NULL); + entry_call_recursion_depth = entry_thread->heap->call_recursion_depth; + entry_jmpbuf_ptr = entry_thread->heap->lj.jmpbuf_ptr; + + /* + * Note: we currently assume that the setjmp() catchpoint is + * not re-entrant (longjmp() cannot be called more than once + * for a single setjmp()). + * + * See doc/code-issues.rst for notes on variable assignment + * before and after setjmp(). + */ + + for (;;) { + heap->lj.jmpbuf_ptr = &our_jmpbuf; + DUK_ASSERT(heap->lj.jmpbuf_ptr != NULL); + +#if defined(DUK_USE_CPP_EXCEPTIONS) + try { +#else + DUK_ASSERT(heap->lj.jmpbuf_ptr == &our_jmpbuf); + if (DUK_SETJMP(our_jmpbuf.jb) == 0) { +#endif + /* Execute bytecode until returned or longjmp(). */ + duk__js_execute_bytecode_inner(entry_thread, entry_act); + + /* Successful return: restore jmpbuf and return to caller. */ + heap->lj.jmpbuf_ptr = entry_jmpbuf_ptr; + + return; +#if defined(DUK_USE_CPP_EXCEPTIONS) + } catch (duk_internal_exception &exc) { +#else + } else { +#endif +#if defined(DUK_USE_CPP_EXCEPTIONS) + DUK_UNREF(exc); +#endif + DUK_DDD(DUK_DDDPRINT("longjmp caught by bytecode executor")); + DUK_STATS_INC(exec_thr->heap, stats_exec_throw); + + duk__handle_executor_error(heap, + entry_act, + entry_call_recursion_depth, + entry_jmpbuf_ptr); + } +#if defined(DUK_USE_CPP_EXCEPTIONS) + catch (duk_fatal_exception &exc) { + DUK_D(DUK_DPRINT("rethrow duk_fatal_exception")); + throw; + } catch (std::exception &exc) { + const char *what = exc.what(); + if (!what) { + what = "unknown"; + } + DUK_D(DUK_DPRINT("unexpected c++ std::exception (perhaps thrown by user code)")); + DUK_STATS_INC(exec_thr->heap, stats_exec_throw); + try { + DUK_ASSERT(heap->curr_thread != NULL); + DUK_ERROR_FMT1(heap->curr_thread, DUK_ERR_TYPE_ERROR, "caught invalid c++ std::exception '%s' (perhaps thrown by user code)", what); + DUK_WO_NORETURN(return;); + } catch (duk_internal_exception exc) { + DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ std::exception")); + DUK_UNREF(exc); + duk__handle_executor_error(heap, + entry_act, + entry_call_recursion_depth, + entry_jmpbuf_ptr); + } + } catch (...) { + DUK_D(DUK_DPRINT("unexpected c++ exception (perhaps thrown by user code)")); + DUK_STATS_INC(exec_thr->heap, stats_exec_throw); + try { + DUK_ASSERT(heap->curr_thread != NULL); + DUK_ERROR_TYPE(heap->curr_thread, "caught invalid c++ exception (perhaps thrown by user code)"); + DUK_WO_NORETURN(return;); + } catch (duk_internal_exception exc) { + DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ exception")); + DUK_UNREF(exc); + duk__handle_executor_error(heap, + entry_act, + entry_call_recursion_depth, + entry_jmpbuf_ptr); + } + } +#endif + } + + DUK_WO_NORETURN(return;); +} + +/* Inner executor, performance critical. */ +DUK_LOCAL DUK_NOINLINE DUK_HOT void duk__js_execute_bytecode_inner(duk_hthread *entry_thread, duk_activation *entry_act) { + /* Current PC, accessed by other functions through thr->ptr_to_curr_pc. + * Critical for performance. It would be safest to make this volatile, + * but that eliminates performance benefits; aliasing guarantees + * should be enough though. + */ + duk_instr_t *curr_pc; /* bytecode has a stable pointer */ + + /* Hot variables for interpretation. Critical for performance, + * but must add sparingly to minimize register shuffling. + */ + duk_hthread *thr; /* stable */ + duk_tval *consts; /* stable */ + duk_uint_fast32_t ins; + /* 'funcs' is quite rarely used, so no local for it */ +#if defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompfunc *fun; +#else + /* 'fun' is quite rarely used, so no local for it */ +#endif + +#if defined(DUK_USE_INTERRUPT_COUNTER) + duk_int_t int_ctr; +#endif + +#if defined(DUK_USE_ASSERTIONS) + duk_size_t valstack_top_base; /* valstack top, should match before interpreting each op (no leftovers) */ +#endif + + /* Optimized reg/const access macros assume sizeof(duk_tval) to be + * either 8 or 16. Heap allocation checks this even without asserts + * enabled now because it can't be autodetected in duk_config.h. + */ +#if 1 +#if defined(DUK_USE_PACKED_TVAL) + DUK_ASSERT(sizeof(duk_tval) == 8); +#else + DUK_ASSERT(sizeof(duk_tval) == 16); +#endif +#endif + + DUK_GC_TORTURE(entry_thread->heap); + + /* + * Restart execution by reloading thread state. + * + * Note that 'thr' and any thread configuration may have changed, + * so all local variables are suspect and we need to reinitialize. + * + * The number of local variables should be kept to a minimum: if + * the variables are spilled, they will need to be loaded from + * memory anyway. + * + * Any 'goto restart_execution;' code path in opcode dispatch must + * ensure 'curr_pc' is synced back to act->curr_pc before the goto + * takes place. + * + * The interpreter must be very careful with memory pointers, as + * many pointers are not guaranteed to be 'stable' and may be + * reallocated and relocated on-the-fly quite easily (e.g. by a + * memory allocation or a property access). + * + * The following are assumed to have stable pointers: + * - the current thread + * - the current function + * - the bytecode, constant table, inner function table of the + * current function (as they are a part of the function allocation) + * + * The following are assumed to have semi-stable pointers: + * - the current activation entry: stable as long as callstack + * is not changed (reallocated by growing or shrinking), or + * by any garbage collection invocation (through finalizers) + * - Note in particular that ANY DECREF can invalidate the + * activation pointer, so for the most part a fresh lookup + * is required + * + * The following are not assumed to have stable pointers at all: + * - the value stack (registers) of the current thread + * + * See execution.rst for discussion. + */ + + restart_execution: + + /* Lookup current thread; use the stable 'entry_thread' for this to + * avoid clobber warnings. Any valid, reachable 'thr' value would be + * fine for this, so using 'entry_thread' is just to silence warnings. + */ + thr = entry_thread->heap->curr_thread; + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->callstack_curr != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack_curr) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(DUK_ACT_GET_FUNC(thr->callstack_curr))); + + DUK_GC_TORTURE(thr->heap); + + thr->ptr_curr_pc = &curr_pc; + + /* Relookup and initialize dispatch loop variables. Debugger check. */ + { + duk_activation *act; +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompfunc *fun; +#endif + + /* Assume interrupt init/counter are properly initialized here. */ + /* Assume that thr->valstack_bottom has been set-up before getting here. */ + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + fun = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + DUK_ASSERT(fun != NULL); + DUK_ASSERT(thr->valstack_top - thr->valstack_bottom == fun->nregs); + consts = DUK_HCOMPFUNC_GET_CONSTS_BASE(thr->heap, fun); + DUK_ASSERT(consts != NULL); + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (DUK_UNLIKELY(duk_debug_is_attached(thr->heap) && !thr->heap->dbg_processing)) { + duk__executor_recheck_debugger(thr, act, fun); + DUK_ASSERT(act == thr->callstack_curr); + DUK_ASSERT(act != NULL); + } +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +#if defined(DUK_USE_ASSERTIONS) + valstack_top_base = (duk_size_t) (thr->valstack_top - thr->valstack); +#endif + + /* Set up curr_pc for opcode dispatch. */ + curr_pc = act->curr_pc; + } + + DUK_DD(DUK_DDPRINT("restarting execution, thr %p, act idx %ld, fun %p," + "consts %p, funcs %p, lev %ld, regbot %ld, regtop %ld, " + "preventcount=%ld", + (void *) thr, + (long) (thr->callstack_top - 1), + (void *) DUK__FUN(), + (void *) DUK_HCOMPFUNC_GET_CONSTS_BASE(thr->heap, DUK__FUN()), + (void *) DUK_HCOMPFUNC_GET_FUNCS_BASE(thr->heap, DUK__FUN()), + (long) (thr->callstack_top - 1), + (long) (thr->valstack_bottom - thr->valstack), + (long) (thr->valstack_top - thr->valstack), + (long) thr->callstack_preventcount)); + + /* Dispatch loop. */ + + for (;;) { + duk_uint8_t op; + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->valstack_top - thr->valstack_bottom == DUK__FUN()->nregs); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack) == valstack_top_base); + + /* Executor interrupt counter check, used to implement breakpoints, + * debugging interface, execution timeouts, etc. The counter is heap + * specific but is maintained in the current thread to make the check + * as fast as possible. The counter is copied back to the heap struct + * whenever a thread switch occurs by the DUK_HEAP_SWITCH_THREAD() macro. + */ +#if defined(DUK_USE_INTERRUPT_COUNTER) + int_ctr = thr->interrupt_counter; + if (DUK_LIKELY(int_ctr > 0)) { + thr->interrupt_counter = int_ctr - 1; + } else { + /* Trigger at zero or below */ + duk_small_uint_t exec_int_ret; + + DUK_STATS_INC(thr->heap, stats_exec_interrupt); + + /* Write curr_pc back for the debugger. */ + { + duk_activation *act; + DUK_ASSERT(thr->callstack_top > 0); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + act->curr_pc = (duk_instr_t *) curr_pc; + } + + /* Forced restart caused by a function return; must recheck + * debugger breakpoints before checking line transitions, + * see GH-303. Restart and then handle interrupt_counter + * zero again. + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (thr->heap->dbg_force_restart) { + DUK_DD(DUK_DDPRINT("dbg_force_restart flag forced restart execution")); /* GH-303 */ + thr->heap->dbg_force_restart = 0; + goto restart_execution; + } +#endif + + exec_int_ret = duk__executor_interrupt(thr); + if (exec_int_ret == DUK__INT_RESTART) { + /* curr_pc synced back above */ + goto restart_execution; + } + } +#endif /* DUK_USE_INTERRUPT_COUNTER */ +#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) + /* For cross-checking during development: ensure dispatch count + * matches cumulative interrupt counter init value sums. + */ + thr->heap->inst_count_exec++; +#endif + +#if defined(DUK_USE_ASSERTIONS) || defined(DUK_USE_DEBUG) + { + duk_activation *act; + act = thr->callstack_curr; + DUK_ASSERT(curr_pc >= DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, DUK__FUN())); + DUK_ASSERT(curr_pc < DUK_HCOMPFUNC_GET_CODE_END(thr->heap, DUK__FUN())); + DUK_UNREF(act); /* if debugging disabled */ + + DUK_DDD(DUK_DDDPRINT("executing bytecode: pc=%ld, ins=0x%08lx, op=%ld, valstack_top=%ld/%ld, nregs=%ld --> %!I", + (long) (curr_pc - DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, DUK__FUN())), + (unsigned long) *curr_pc, + (long) DUK_DEC_OP(*curr_pc), + (long) (thr->valstack_top - thr->valstack), + (long) (thr->valstack_end - thr->valstack), + (long) (DUK__FUN() ? DUK__FUN()->nregs : -1), + (duk_instr_t) *curr_pc)); + } +#endif + +#if defined(DUK_USE_ASSERTIONS) + /* Quite heavy assert: check valstack policy. Improper + * shuffle instructions can write beyond valstack_top/end + * so this check catches them in the act. + */ + { + duk_tval *tv; + tv = thr->valstack_top; + while (tv != thr->valstack_end) { + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); + tv++; + } + } +#endif + + ins = *curr_pc++; + DUK_STATS_INC(thr->heap, stats_exec_opcodes); + + /* Typing: use duk_small_(u)int_fast_t when decoding small + * opcode fields (op, A, B, C, BC) which fit into 16 bits + * and duk_(u)int_fast_t when decoding larger fields (e.g. + * ABC). Use unsigned variant by default, signed when the + * value is used in signed arithmetic. Using variable names + * such as 'a', 'b', 'c', 'bc', etc makes it easier to spot + * typing mismatches. + */ + + /* Switch based on opcode. Cast to 8-bit unsigned value and + * use a fully populated case clauses so that the compiler + * will (at least usually) omit a bounds check. + */ + op = (duk_uint8_t) DUK_DEC_OP(ins); + switch (op) { + + /* Some useful macros. These access inner executor variables + * directly so they only apply within the executor. + */ +#if defined(DUK_USE_EXEC_PREFER_SIZE) +#define DUK__REPLACE_TOP_A_BREAK() { goto replace_top_a; } +#define DUK__REPLACE_TOP_BC_BREAK() { goto replace_top_bc; } +#define DUK__REPLACE_BOOL_A_BREAK(bval) { \ + duk_bool_t duk__bval; \ + duk__bval = (bval); \ + DUK_ASSERT(duk__bval == 0 || duk__bval == 1); \ + duk_push_boolean(thr, duk__bval); \ + DUK__REPLACE_TOP_A_BREAK(); \ + } +#else +#define DUK__REPLACE_TOP_A_BREAK() { DUK__REPLACE_TO_TVPTR(thr, DUK__REGP_A(ins)); break; } +#define DUK__REPLACE_TOP_BC_BREAK() { DUK__REPLACE_TO_TVPTR(thr, DUK__REGP_BC(ins)); break; } +#define DUK__REPLACE_BOOL_A_BREAK(bval) { \ + duk_bool_t duk__bval; \ + duk_tval *duk__tvdst; \ + duk__bval = (bval); \ + DUK_ASSERT(duk__bval == 0 || duk__bval == 1); \ + duk__tvdst = DUK__REGP_A(ins); \ + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, duk__tvdst, duk__bval); \ + break; \ + } +#endif + + /* XXX: 12 + 12 bit variant might make sense too, for both reg and + * const loads. + */ + + /* For LDREG, STREG, LDCONST footprint optimized variants would just + * duk_dup() + duk_replace(), but because they're used quite a lot + * they're currently intentionally not size optimized. + */ + case DUK_OP_LDREG: { + duk_tval *tv1, *tv2; + + tv1 = DUK__REGP_A(ins); + tv2 = DUK__REGP_BC(ins); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */ + break; + } + + case DUK_OP_STREG: { + duk_tval *tv1, *tv2; + + tv1 = DUK__REGP_A(ins); + tv2 = DUK__REGP_BC(ins); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv2, tv1); /* side effects */ + break; + } + + case DUK_OP_LDCONST: { + duk_tval *tv1, *tv2; + + tv1 = DUK__REGP_A(ins); + tv2 = DUK__CONSTP_BC(ins); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */ + break; + } + + /* LDINT and LDINTX are intended to load an arbitrary signed + * 32-bit value. Only an LDINT+LDINTX sequence is supported. + * This also guarantees all values remain fastints. + */ +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_LDINT: { + duk_int32_t val; + + val = (duk_int32_t) DUK_DEC_BC(ins) - (duk_int32_t) DUK_BC_LDINT_BIAS; + duk_push_int(thr, val); + DUK__REPLACE_TOP_A_BREAK(); + } + case DUK_OP_LDINTX: { + duk_int32_t val; + + val = (duk_int32_t) duk_get_int(thr, DUK_DEC_A(ins)); + val = (val << DUK_BC_LDINTX_SHIFT) + (duk_int32_t) DUK_DEC_BC(ins); /* no bias */ + duk_push_int(thr, val); + DUK__REPLACE_TOP_A_BREAK(); + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_LDINT: { + duk_tval *tv1; + duk_int32_t val; + + val = (duk_int32_t) DUK_DEC_BC(ins) - (duk_int32_t) DUK_BC_LDINT_BIAS; + tv1 = DUK__REGP_A(ins); + DUK_TVAL_SET_I32_UPDREF(thr, tv1, val); /* side effects */ + break; + } + case DUK_OP_LDINTX: { + duk_tval *tv1; + duk_int32_t val; + + tv1 = DUK__REGP_A(ins); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1)); + val = DUK_TVAL_GET_FASTINT_I32(tv1); +#else + /* XXX: fast double-to-int conversion, we know number is integer in [-0x80000000,0xffffffff]. */ + val = (duk_int32_t) DUK_TVAL_GET_NUMBER(tv1); +#endif + val = (duk_int32_t) ((duk_uint32_t) val << DUK_BC_LDINTX_SHIFT) + (duk_int32_t) DUK_DEC_BC(ins); /* no bias */ + DUK_TVAL_SET_I32_UPDREF(thr, tv1, val); /* side effects */ + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_LDTHIS: { + duk_push_this(thr); + DUK__REPLACE_TOP_BC_BREAK(); + } + case DUK_OP_LDUNDEF: { + duk_to_undefined(thr, (duk_idx_t) DUK_DEC_BC(ins)); + break; + } + case DUK_OP_LDNULL: { + duk_to_null(thr, (duk_idx_t) DUK_DEC_BC(ins)); + break; + } + case DUK_OP_LDTRUE: { + duk_push_true(thr); + DUK__REPLACE_TOP_BC_BREAK(); + } + case DUK_OP_LDFALSE: { + duk_push_false(thr); + DUK__REPLACE_TOP_BC_BREAK(); + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_LDTHIS: { + /* Note: 'this' may be bound to any value, not just an object */ + duk_tval *tv1, *tv2; + + tv1 = DUK__REGP_BC(ins); + tv2 = thr->valstack_bottom - 1; /* 'this binding' is just under bottom */ + DUK_ASSERT(tv2 >= thr->valstack); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */ + break; + } + case DUK_OP_LDUNDEF: { + duk_tval *tv1; + + tv1 = DUK__REGP_BC(ins); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */ + break; + } + case DUK_OP_LDNULL: { + duk_tval *tv1; + + tv1 = DUK__REGP_BC(ins); + DUK_TVAL_SET_NULL_UPDREF(thr, tv1); /* side effects */ + break; + } + case DUK_OP_LDTRUE: { + duk_tval *tv1; + + tv1 = DUK__REGP_BC(ins); + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv1, 1); /* side effects */ + break; + } + case DUK_OP_LDFALSE: { + duk_tval *tv1; + + tv1 = DUK__REGP_BC(ins); + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv1, 0); /* side effects */ + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + case DUK_OP_BNOT: { + duk__vm_bitwise_not(thr, DUK_DEC_BC(ins), DUK_DEC_A(ins)); + break; + } + + case DUK_OP_LNOT: { + duk__vm_logical_not(thr, DUK_DEC_BC(ins), DUK_DEC_A(ins)); + break; + } + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_UNM: + case DUK_OP_UNP: { + duk__vm_arith_unary_op(thr, DUK_DEC_BC(ins), DUK_DEC_A(ins), op); + break; + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_UNM: { + duk__vm_arith_unary_op(thr, DUK_DEC_BC(ins), DUK_DEC_A(ins), DUK_OP_UNM); + break; + } + case DUK_OP_UNP: { + duk__vm_arith_unary_op(thr, DUK_DEC_BC(ins), DUK_DEC_A(ins), DUK_OP_UNP); + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_TYPEOF: { + duk_small_uint_t stridx; + + stridx = duk_js_typeof_stridx(DUK__REGP_BC(ins)); + DUK_ASSERT_STRIDX_VALID(stridx); + duk_push_hstring_stridx(thr, stridx); + DUK__REPLACE_TOP_A_BREAK(); + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_TYPEOF: { + duk_tval *tv; + duk_small_uint_t stridx; + duk_hstring *h_str; + + tv = DUK__REGP_BC(ins); + stridx = duk_js_typeof_stridx(tv); + DUK_ASSERT_STRIDX_VALID(stridx); + h_str = DUK_HTHREAD_GET_STRING(thr, stridx); + tv = DUK__REGP_A(ins); + DUK_TVAL_SET_STRING_UPDREF(thr, tv, h_str); + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + case DUK_OP_TYPEOFID: { + duk_small_uint_t stridx; +#if !defined(DUK_USE_EXEC_PREFER_SIZE) + duk_hstring *h_str; +#endif + duk_activation *act; + duk_hstring *name; + duk_tval *tv; + + /* A -> target register + * BC -> constant index of identifier name + */ + + tv = DUK__CONSTP_BC(ins); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv)); + name = DUK_TVAL_GET_STRING(tv); + tv = NULL; /* lookup has side effects */ + act = thr->callstack_curr; + if (duk_js_getvar_activation(thr, act, name, 0 /*throw*/)) { + /* -> [... val this] */ + tv = DUK_GET_TVAL_NEGIDX(thr, -2); + stridx = duk_js_typeof_stridx(tv); + tv = NULL; /* no longer needed */ + duk_pop_2_unsafe(thr); + } else { + /* unresolvable, no stack changes */ + stridx = DUK_STRIDX_LC_UNDEFINED; + } + DUK_ASSERT_STRIDX_VALID(stridx); +#if defined(DUK_USE_EXEC_PREFER_SIZE) + duk_push_hstring_stridx(thr, stridx); + DUK__REPLACE_TOP_A_BREAK(); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + h_str = DUK_HTHREAD_GET_STRING(thr, stridx); + tv = DUK__REGP_A(ins); + DUK_TVAL_SET_STRING_UPDREF(thr, tv, h_str); + break; +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + } + + /* Equality: E5 Sections 11.9.1, 11.9.3 */ + +#define DUK__EQ_BODY(barg,carg) { \ + duk_bool_t tmp; \ + tmp = duk_js_equals(thr, (barg), (carg)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#define DUK__NEQ_BODY(barg,carg) { \ + duk_bool_t tmp; \ + tmp = duk_js_equals(thr, (barg), (carg)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + tmp ^= 1; \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#define DUK__SEQ_BODY(barg,carg) { \ + duk_bool_t tmp; \ + tmp = duk_js_strict_equals((barg), (carg)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#define DUK__SNEQ_BODY(barg,carg) { \ + duk_bool_t tmp; \ + tmp = duk_js_strict_equals((barg), (carg)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + tmp ^= 1; \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_EQ_RR: + case DUK_OP_EQ_CR: + case DUK_OP_EQ_RC: + case DUK_OP_EQ_CC: + DUK__EQ_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_NEQ_RR: + case DUK_OP_NEQ_CR: + case DUK_OP_NEQ_RC: + case DUK_OP_NEQ_CC: + DUK__NEQ_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_SEQ_RR: + case DUK_OP_SEQ_CR: + case DUK_OP_SEQ_RC: + case DUK_OP_SEQ_CC: + DUK__SEQ_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_SNEQ_RR: + case DUK_OP_SNEQ_CR: + case DUK_OP_SNEQ_RC: + case DUK_OP_SNEQ_CC: + DUK__SNEQ_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_EQ_RR: + DUK__EQ_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_EQ_CR: + DUK__EQ_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_EQ_RC: + DUK__EQ_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_EQ_CC: + DUK__EQ_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_NEQ_RR: + DUK__NEQ_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_NEQ_CR: + DUK__NEQ_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_NEQ_RC: + DUK__NEQ_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_NEQ_CC: + DUK__NEQ_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_SEQ_RR: + DUK__SEQ_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_SEQ_CR: + DUK__SEQ_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_SEQ_RC: + DUK__SEQ_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_SEQ_CC: + DUK__SEQ_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_SNEQ_RR: + DUK__SNEQ_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_SNEQ_CR: + DUK__SNEQ_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_SNEQ_RC: + DUK__SNEQ_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_SNEQ_CC: + DUK__SNEQ_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + +#define DUK__COMPARE_BODY(arg1,arg2,flags) { \ + duk_bool_t tmp; \ + tmp = duk_js_compare_helper(thr, (arg1), (arg2), (flags)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#define DUK__GT_BODY(barg,carg) DUK__COMPARE_BODY((carg), (barg), 0) +#define DUK__GE_BODY(barg,carg) DUK__COMPARE_BODY((barg), (carg), DUK_COMPARE_FLAG_EVAL_LEFT_FIRST | DUK_COMPARE_FLAG_NEGATE) +#define DUK__LT_BODY(barg,carg) DUK__COMPARE_BODY((barg), (carg), DUK_COMPARE_FLAG_EVAL_LEFT_FIRST) +#define DUK__LE_BODY(barg,carg) DUK__COMPARE_BODY((carg), (barg), DUK_COMPARE_FLAG_NEGATE) +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_GT_RR: + case DUK_OP_GT_CR: + case DUK_OP_GT_RC: + case DUK_OP_GT_CC: + DUK__GT_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_GE_RR: + case DUK_OP_GE_CR: + case DUK_OP_GE_RC: + case DUK_OP_GE_CC: + DUK__GE_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_LT_RR: + case DUK_OP_LT_CR: + case DUK_OP_LT_RC: + case DUK_OP_LT_CC: + DUK__LT_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_LE_RR: + case DUK_OP_LE_CR: + case DUK_OP_LE_RC: + case DUK_OP_LE_CC: + DUK__LE_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_GT_RR: + DUK__GT_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GT_CR: + DUK__GT_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GT_RC: + DUK__GT_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_GT_CC: + DUK__GT_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_GE_RR: + DUK__GE_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GE_CR: + DUK__GE_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GE_RC: + DUK__GE_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_GE_CC: + DUK__GE_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_LT_RR: + DUK__LT_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_LT_CR: + DUK__LT_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_LT_RC: + DUK__LT_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_LT_CC: + DUK__LT_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_LE_RR: + DUK__LE_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_LE_CR: + DUK__LE_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_LE_RC: + DUK__LE_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_LE_CC: + DUK__LE_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + /* No size optimized variant at present for IF. */ + case DUK_OP_IFTRUE_R: { + if (duk_js_toboolean(DUK__REGP_BC(ins)) != 0) { + curr_pc++; + } + break; + } + case DUK_OP_IFTRUE_C: { + if (duk_js_toboolean(DUK__CONSTP_BC(ins)) != 0) { + curr_pc++; + } + break; + } + case DUK_OP_IFFALSE_R: { + if (duk_js_toboolean(DUK__REGP_BC(ins)) == 0) { + curr_pc++; + } + break; + } + case DUK_OP_IFFALSE_C: { + if (duk_js_toboolean(DUK__CONSTP_BC(ins)) == 0) { + curr_pc++; + } + break; + } + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_ADD_RR: + case DUK_OP_ADD_CR: + case DUK_OP_ADD_RC: + case DUK_OP_ADD_CC: { + /* XXX: could leave value on stack top and goto replace_top_a; */ + duk__vm_arith_add(thr, DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins), DUK_DEC_A(ins)); + break; + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_ADD_RR: { + duk__vm_arith_add(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins)); + break; + } + case DUK_OP_ADD_CR: { + duk__vm_arith_add(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins)); + break; + } + case DUK_OP_ADD_RC: { + duk__vm_arith_add(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins)); + break; + } + case DUK_OP_ADD_CC: { + duk__vm_arith_add(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins)); + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_SUB_RR: + case DUK_OP_SUB_CR: + case DUK_OP_SUB_RC: + case DUK_OP_SUB_CC: + case DUK_OP_MUL_RR: + case DUK_OP_MUL_CR: + case DUK_OP_MUL_RC: + case DUK_OP_MUL_CC: + case DUK_OP_DIV_RR: + case DUK_OP_DIV_CR: + case DUK_OP_DIV_RC: + case DUK_OP_DIV_CC: + case DUK_OP_MOD_RR: + case DUK_OP_MOD_CR: + case DUK_OP_MOD_RC: + case DUK_OP_MOD_CC: +#if defined(DUK_USE_ES7_EXP_OPERATOR) + case DUK_OP_EXP_RR: + case DUK_OP_EXP_CR: + case DUK_OP_EXP_RC: + case DUK_OP_EXP_CC: +#endif /* DUK_USE_ES7_EXP_OPERATOR */ + { + /* XXX: could leave value on stack top and goto replace_top_a; */ + duk__vm_arith_binary_op(thr, DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins), DUK_DEC_A(ins), op); + break; + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_SUB_RR: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_SUB); + break; + } + case DUK_OP_SUB_CR: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_SUB); + break; + } + case DUK_OP_SUB_RC: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_SUB); + break; + } + case DUK_OP_SUB_CC: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_SUB); + break; + } + case DUK_OP_MUL_RR: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_MUL); + break; + } + case DUK_OP_MUL_CR: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_MUL); + break; + } + case DUK_OP_MUL_RC: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_MUL); + break; + } + case DUK_OP_MUL_CC: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_MUL); + break; + } + case DUK_OP_DIV_RR: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_DIV); + break; + } + case DUK_OP_DIV_CR: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_DIV); + break; + } + case DUK_OP_DIV_RC: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_DIV); + break; + } + case DUK_OP_DIV_CC: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_DIV); + break; + } + case DUK_OP_MOD_RR: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_MOD); + break; + } + case DUK_OP_MOD_CR: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_MOD); + break; + } + case DUK_OP_MOD_RC: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_MOD); + break; + } + case DUK_OP_MOD_CC: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_MOD); + break; + } +#if defined(DUK_USE_ES7_EXP_OPERATOR) + case DUK_OP_EXP_RR: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_EXP); + break; + } + case DUK_OP_EXP_CR: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_EXP); + break; + } + case DUK_OP_EXP_RC: { + duk__vm_arith_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_EXP); + break; + } + case DUK_OP_EXP_CC: { + duk__vm_arith_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_EXP); + break; + } +#endif /* DUK_USE_ES7_EXP_OPERATOR */ +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_BAND_RR: + case DUK_OP_BAND_CR: + case DUK_OP_BAND_RC: + case DUK_OP_BAND_CC: + case DUK_OP_BOR_RR: + case DUK_OP_BOR_CR: + case DUK_OP_BOR_RC: + case DUK_OP_BOR_CC: + case DUK_OP_BXOR_RR: + case DUK_OP_BXOR_CR: + case DUK_OP_BXOR_RC: + case DUK_OP_BXOR_CC: + case DUK_OP_BASL_RR: + case DUK_OP_BASL_CR: + case DUK_OP_BASL_RC: + case DUK_OP_BASL_CC: + case DUK_OP_BLSR_RR: + case DUK_OP_BLSR_CR: + case DUK_OP_BLSR_RC: + case DUK_OP_BLSR_CC: + case DUK_OP_BASR_RR: + case DUK_OP_BASR_CR: + case DUK_OP_BASR_RC: + case DUK_OP_BASR_CC: { + /* XXX: could leave value on stack top and goto replace_top_a; */ + duk__vm_bitwise_binary_op(thr, DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins), DUK_DEC_A(ins), op); + break; + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_BAND_RR: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BAND); + break; + } + case DUK_OP_BAND_CR: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BAND); + break; + } + case DUK_OP_BAND_RC: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BAND); + break; + } + case DUK_OP_BAND_CC: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BAND); + break; + } + case DUK_OP_BOR_RR: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BOR); + break; + } + case DUK_OP_BOR_CR: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BOR); + break; + } + case DUK_OP_BOR_RC: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BOR); + break; + } + case DUK_OP_BOR_CC: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BOR); + break; + } + case DUK_OP_BXOR_RR: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BXOR); + break; + } + case DUK_OP_BXOR_CR: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BXOR); + break; + } + case DUK_OP_BXOR_RC: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BXOR); + break; + } + case DUK_OP_BXOR_CC: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BXOR); + break; + } + case DUK_OP_BASL_RR: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BASL); + break; + } + case DUK_OP_BASL_CR: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BASL); + break; + } + case DUK_OP_BASL_RC: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BASL); + break; + } + case DUK_OP_BASL_CC: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BASL); + break; + } + case DUK_OP_BLSR_RR: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BLSR); + break; + } + case DUK_OP_BLSR_CR: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BLSR); + break; + } + case DUK_OP_BLSR_RC: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BLSR); + break; + } + case DUK_OP_BLSR_CC: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BLSR); + break; + } + case DUK_OP_BASR_RR: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BASR); + break; + } + case DUK_OP_BASR_CR: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__REGP_C(ins), DUK_DEC_A(ins), DUK_OP_BASR); + break; + } + case DUK_OP_BASR_RC: { + duk__vm_bitwise_binary_op(thr, DUK__REGP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BASR); + break; + } + case DUK_OP_BASR_CC: { + duk__vm_bitwise_binary_op(thr, DUK__CONSTP_B(ins), DUK__CONSTP_C(ins), DUK_DEC_A(ins), DUK_OP_BASR); + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + /* For INSTOF and IN, B is always a register. */ +#define DUK__INSTOF_BODY(barg,carg) { \ + duk_bool_t tmp; \ + tmp = duk_js_instanceof(thr, (barg), (carg)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#define DUK__IN_BODY(barg,carg) { \ + duk_bool_t tmp; \ + tmp = duk_js_in(thr, (barg), (carg)); \ + DUK_ASSERT(tmp == 0 || tmp == 1); \ + DUK__REPLACE_BOOL_A_BREAK(tmp); \ + } +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_INSTOF_RR: + case DUK_OP_INSTOF_CR: + case DUK_OP_INSTOF_RC: + case DUK_OP_INSTOF_CC: + DUK__INSTOF_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_IN_RR: + case DUK_OP_IN_CR: + case DUK_OP_IN_RC: + case DUK_OP_IN_CC: + DUK__IN_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_INSTOF_RR: + DUK__INSTOF_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_INSTOF_CR: + DUK__INSTOF_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_INSTOF_RC: + DUK__INSTOF_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_INSTOF_CC: + DUK__INSTOF_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_IN_RR: + DUK__IN_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_IN_CR: + DUK__IN_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_IN_RC: + DUK__IN_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_IN_CC: + DUK__IN_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + /* Pre/post inc/dec for register variables, important for loops. */ +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_PREINCR: + case DUK_OP_PREDECR: + case DUK_OP_POSTINCR: + case DUK_OP_POSTDECR: { + duk__prepost_incdec_reg_helper(thr, DUK__REGP_A(ins), DUK__REGP_BC(ins), op); + break; + } + case DUK_OP_PREINCV: + case DUK_OP_PREDECV: + case DUK_OP_POSTINCV: + case DUK_OP_POSTDECV: { + duk__prepost_incdec_var_helper(thr, DUK_DEC_A(ins), DUK__CONSTP_BC(ins), op, DUK__STRICT()); + break; + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_PREINCR: { + duk__prepost_incdec_reg_helper(thr, DUK__REGP_A(ins), DUK__REGP_BC(ins), DUK_OP_PREINCR); + break; + } + case DUK_OP_PREDECR: { + duk__prepost_incdec_reg_helper(thr, DUK__REGP_A(ins), DUK__REGP_BC(ins), DUK_OP_PREDECR); + break; + } + case DUK_OP_POSTINCR: { + duk__prepost_incdec_reg_helper(thr, DUK__REGP_A(ins), DUK__REGP_BC(ins), DUK_OP_POSTINCR); + break; + } + case DUK_OP_POSTDECR: { + duk__prepost_incdec_reg_helper(thr, DUK__REGP_A(ins), DUK__REGP_BC(ins), DUK_OP_POSTDECR); + break; + } + case DUK_OP_PREINCV: { + duk__prepost_incdec_var_helper(thr, DUK_DEC_A(ins), DUK__CONSTP_BC(ins), DUK_OP_PREINCV, DUK__STRICT()); + break; + } + case DUK_OP_PREDECV: { + duk__prepost_incdec_var_helper(thr, DUK_DEC_A(ins), DUK__CONSTP_BC(ins), DUK_OP_PREDECV, DUK__STRICT()); + break; + } + case DUK_OP_POSTINCV: { + duk__prepost_incdec_var_helper(thr, DUK_DEC_A(ins), DUK__CONSTP_BC(ins), DUK_OP_POSTINCV, DUK__STRICT()); + break; + } + case DUK_OP_POSTDECV: { + duk__prepost_incdec_var_helper(thr, DUK_DEC_A(ins), DUK__CONSTP_BC(ins), DUK_OP_POSTDECV, DUK__STRICT()); + break; + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + /* XXX: Move to separate helper, optimize for perf/size separately. */ + /* Preinc/predec for object properties. */ + case DUK_OP_PREINCP_RR: + case DUK_OP_PREINCP_CR: + case DUK_OP_PREINCP_RC: + case DUK_OP_PREINCP_CC: + case DUK_OP_PREDECP_RR: + case DUK_OP_PREDECP_CR: + case DUK_OP_PREDECP_RC: + case DUK_OP_PREDECP_CC: + case DUK_OP_POSTINCP_RR: + case DUK_OP_POSTINCP_CR: + case DUK_OP_POSTINCP_RC: + case DUK_OP_POSTINCP_CC: + case DUK_OP_POSTDECP_RR: + case DUK_OP_POSTDECP_CR: + case DUK_OP_POSTDECP_RC: + case DUK_OP_POSTDECP_CC: { + duk_tval *tv_obj; + duk_tval *tv_key; + duk_tval *tv_val; + duk_bool_t rc; + duk_double_t x, y, z; +#if !defined(DUK_USE_EXEC_PREFER_SIZE) + duk_tval *tv_dst; +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + /* A -> target reg + * B -> object reg/const (may be const e.g. in "'foo'[1]") + * C -> key reg/const + */ + + /* Opcode bits 0-1 are used to distinguish reg/const variants. + * Opcode bits 2-3 are used to distinguish inc/dec variants: + * Bit 2 = inc(0)/dec(1), bit 3 = pre(0)/post(1). + */ + DUK_ASSERT((DUK_OP_PREINCP_RR & 0x0c) == 0x00); + DUK_ASSERT((DUK_OP_PREDECP_RR & 0x0c) == 0x04); + DUK_ASSERT((DUK_OP_POSTINCP_RR & 0x0c) == 0x08); + DUK_ASSERT((DUK_OP_POSTDECP_RR & 0x0c) == 0x0c); + + tv_obj = DUK__REGCONSTP_B(ins); + tv_key = DUK__REGCONSTP_C(ins); + rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */ + DUK_UNREF(rc); /* ignore */ + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + + /* XXX: Fastint fast path would be useful here. Also fastints + * now lose their fastint status in current handling which is + * not intuitive. + */ + + x = duk_to_number_m1(thr); + duk_pop_unsafe(thr); + if (ins & DUK_BC_INCDECP_FLAG_DEC) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + duk_push_number(thr, y); + tv_val = DUK_GET_TVAL_NEGIDX(thr, -1); + DUK_ASSERT(tv_val != NULL); + tv_obj = DUK__REGCONSTP_B(ins); + tv_key = DUK__REGCONSTP_C(ins); + rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, DUK__STRICT()); + DUK_UNREF(rc); /* ignore */ + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + duk_pop_unsafe(thr); + + z = (ins & DUK_BC_INCDECP_FLAG_POST) ? x : y; +#if defined(DUK_USE_EXEC_PREFER_SIZE) + duk_push_number(thr, z); + DUK__REPLACE_TOP_A_BREAK(); +#else + tv_dst = DUK__REGP_A(ins); + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_dst, z); + break; +#endif + } + + /* XXX: GETPROP where object is 'this', GETPROPT? + * Occurs relatively often in object oriented code. + */ + +#define DUK__GETPROP_BODY(barg,carg) { \ + /* A -> target reg \ + * B -> object reg/const (may be const e.g. in "'foo'[1]") \ + * C -> key reg/const \ + */ \ + (void) duk_hobject_getprop(thr, (barg), (carg)); \ + DUK__REPLACE_TOP_A_BREAK(); \ + } +#define DUK__GETPROPC_BODY(barg,carg) { \ + /* Same as GETPROP but callability check for property-based calls. */ \ + duk_tval *tv__targ; \ + (void) duk_hobject_getprop(thr, (barg), (carg)); \ + DUK_GC_TORTURE(thr->heap); \ + tv__targ = DUK_GET_TVAL_NEGIDX(thr, -1); \ + if (DUK_UNLIKELY(!duk_is_callable_tval(thr, tv__targ))) { \ + /* Here we intentionally re-evaluate the macro \ + * arguments to deal with potentially changed \ + * valstack base pointer! \ + */ \ + duk_call_setup_propcall_error(thr, tv__targ, (barg), (carg)); \ + } \ + DUK__REPLACE_TOP_A_BREAK(); \ + } +#define DUK__PUTPROP_BODY(aarg,barg,carg) { \ + /* A -> object reg \ + * B -> key reg/const \ + * C -> value reg/const \ + * \ + * Note: intentional difference to register arrangement \ + * of e.g. GETPROP; 'A' must contain a register-only value. \ + */ \ + (void) duk_hobject_putprop(thr, (aarg), (barg), (carg), DUK__STRICT()); \ + break; \ + } +#define DUK__DELPROP_BODY(barg,carg) { \ + /* A -> result reg \ + * B -> object reg \ + * C -> key reg/const \ + */ \ + duk_bool_t rc; \ + rc = duk_hobject_delprop(thr, (barg), (carg), DUK__STRICT()); \ + DUK_ASSERT(rc == 0 || rc == 1); \ + DUK__REPLACE_BOOL_A_BREAK(rc); \ + } +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_GETPROP_RR: + case DUK_OP_GETPROP_CR: + case DUK_OP_GETPROP_RC: + case DUK_OP_GETPROP_CC: + DUK__GETPROP_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); +#if defined(DUK_USE_VERBOSE_ERRORS) + case DUK_OP_GETPROPC_RR: + case DUK_OP_GETPROPC_CR: + case DUK_OP_GETPROPC_RC: + case DUK_OP_GETPROPC_CC: + DUK__GETPROPC_BODY(DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); +#endif + case DUK_OP_PUTPROP_RR: + case DUK_OP_PUTPROP_CR: + case DUK_OP_PUTPROP_RC: + case DUK_OP_PUTPROP_CC: + DUK__PUTPROP_BODY(DUK__REGP_A(ins), DUK__REGCONSTP_B(ins), DUK__REGCONSTP_C(ins)); + case DUK_OP_DELPROP_RR: + case DUK_OP_DELPROP_RC: /* B is always reg */ + DUK__DELPROP_BODY(DUK__REGP_B(ins), DUK__REGCONSTP_C(ins)); +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_GETPROP_RR: + DUK__GETPROP_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GETPROP_CR: + DUK__GETPROP_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GETPROP_RC: + DUK__GETPROP_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_GETPROP_CC: + DUK__GETPROP_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); +#if defined(DUK_USE_VERBOSE_ERRORS) + case DUK_OP_GETPROPC_RR: + DUK__GETPROPC_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GETPROPC_CR: + DUK__GETPROPC_BODY(DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_GETPROPC_RC: + DUK__GETPROPC_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_GETPROPC_CC: + DUK__GETPROPC_BODY(DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); +#endif + case DUK_OP_PUTPROP_RR: + DUK__PUTPROP_BODY(DUK__REGP_A(ins), DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_PUTPROP_CR: + DUK__PUTPROP_BODY(DUK__REGP_A(ins), DUK__CONSTP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_PUTPROP_RC: + DUK__PUTPROP_BODY(DUK__REGP_A(ins), DUK__REGP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_PUTPROP_CC: + DUK__PUTPROP_BODY(DUK__REGP_A(ins), DUK__CONSTP_B(ins), DUK__CONSTP_C(ins)); + case DUK_OP_DELPROP_RR: /* B is always reg */ + DUK__DELPROP_BODY(DUK__REGP_B(ins), DUK__REGP_C(ins)); + case DUK_OP_DELPROP_RC: + DUK__DELPROP_BODY(DUK__REGP_B(ins), DUK__CONSTP_C(ins)); +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + /* No fast path for DECLVAR now, it's quite a rare instruction. */ + case DUK_OP_DECLVAR_RR: + case DUK_OP_DECLVAR_CR: + case DUK_OP_DECLVAR_RC: + case DUK_OP_DECLVAR_CC: { + duk_activation *act; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_tval *tv1; + duk_hstring *name; + duk_small_uint_t prop_flags; + duk_bool_t is_func_decl; + + tv1 = DUK__REGCONSTP_B(ins); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + + is_func_decl = ((a & DUK_BC_DECLVAR_FLAG_FUNC_DECL) != 0); + + /* XXX: declvar takes an duk_tval pointer, which is awkward and + * should be reworked. + */ + + /* Compiler is responsible for selecting property flags (configurability, + * writability, etc). + */ + prop_flags = a & DUK_PROPDESC_FLAGS_MASK; + + if (is_func_decl) { + duk_push_tval(thr, DUK__REGCONSTP_C(ins)); + } else { + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); /* valstack policy */ + thr->valstack_top++; + } + tv1 = DUK_GET_TVAL_NEGIDX(thr, -1); + + act = thr->callstack_curr; + if (duk_js_declvar_activation(thr, act, name, tv1, prop_flags, is_func_decl)) { + if (is_func_decl) { + /* Already declared, update value. */ + tv1 = DUK_GET_TVAL_NEGIDX(thr, -1); + duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT()); + } else { + /* Already declared but no initializer value + * (e.g. 'var xyz;'), no-op. + */ + } + } + + duk_pop_unsafe(thr); + break; + } + +#if defined(DUK_USE_REGEXP_SUPPORT) + /* The compiler should never emit DUK_OP_REGEXP if there is no + * regexp support. + */ + case DUK_OP_REGEXP_RR: + case DUK_OP_REGEXP_CR: + case DUK_OP_REGEXP_RC: + case DUK_OP_REGEXP_CC: { + /* A -> target register + * B -> bytecode (also contains flags) + * C -> escaped source + */ + + duk_push_tval(thr, DUK__REGCONSTP_C(ins)); + duk_push_tval(thr, DUK__REGCONSTP_B(ins)); /* -> [ ... escaped_source bytecode ] */ + duk_regexp_create_instance(thr); /* -> [ ... regexp_instance ] */ + DUK__REPLACE_TOP_A_BREAK(); + } +#endif /* DUK_USE_REGEXP_SUPPORT */ + + /* XXX: 'c' is unused, use whole BC, etc. */ + case DUK_OP_CSVAR_RR: + case DUK_OP_CSVAR_CR: + case DUK_OP_CSVAR_RC: + case DUK_OP_CSVAR_CC: { + /* The speciality of calling through a variable binding is that the + * 'this' value may be provided by the variable lookup: E5 Section 6.b.i. + * + * The only (standard) case where the 'this' binding is non-null is when + * (1) the variable is found in an object environment record, and + * (2) that object environment record is a 'with' block. + */ + + duk_activation *act; + duk_uint_fast_t idx; + duk_tval *tv1; + duk_hstring *name; + + /* A -> target registers (A, A + 1) for call setup + * B -> identifier name, usually constant but can be a register due to shuffling + */ + + tv1 = DUK__REGCONSTP_B(ins); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + act = thr->callstack_curr; + (void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */ + + idx = (duk_uint_fast_t) DUK_DEC_A(ins); + + /* Could add direct value stack handling. */ + duk_replace(thr, (duk_idx_t) (idx + 1)); /* 'this' binding */ + duk_replace(thr, (duk_idx_t) idx); /* variable value (function, we hope, not checked here) */ + break; + } + + case DUK_OP_CLOSURE: { + duk_activation *act; + duk_hcompfunc *fun_act; + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); + duk_hobject *fun_temp; + + /* A -> target reg + * BC -> inner function index + */ + + DUK_DDD(DUK_DDDPRINT("CLOSURE to target register %ld, fnum %ld (count %ld)", + (long) DUK_DEC_A(ins), (long) DUK_DEC_BC(ins), (long) DUK_HCOMPFUNC_GET_FUNCS_COUNT(thr->heap, DUK__FUN()))); + + DUK_ASSERT_DISABLE(bc >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) bc < (duk_uint_t) DUK_HCOMPFUNC_GET_FUNCS_COUNT(thr->heap, DUK__FUN())); + + act = thr->callstack_curr; + fun_act = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act); + fun_temp = DUK_HCOMPFUNC_GET_FUNCS_BASE(thr->heap, fun_act)[bc]; + DUK_ASSERT(fun_temp != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC(fun_temp)); + + DUK_DDD(DUK_DDDPRINT("CLOSURE: function template is: %p -> %!O", + (void *) fun_temp, (duk_heaphdr *) fun_temp)); + + if (act->lex_env == NULL) { + DUK_ASSERT(act->var_env == NULL); + duk_js_init_activation_environment_records_delayed(thr, act); + act = thr->callstack_curr; + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + + /* functions always have a NEWENV flag, i.e. they get a + * new variable declaration environment, so only lex_env + * matters here. + */ + duk_js_push_closure(thr, + (duk_hcompfunc *) fun_temp, + act->var_env, + act->lex_env, + 1 /*add_auto_proto*/); + DUK__REPLACE_TOP_A_BREAK(); + } + + case DUK_OP_GETVAR: { + duk_activation *act; + duk_tval *tv1; + duk_hstring *name; + + tv1 = DUK__CONSTP_BC(ins); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + (void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */ + duk_pop_unsafe(thr); /* 'this' binding is not needed here */ + DUK__REPLACE_TOP_A_BREAK(); + } + + case DUK_OP_PUTVAR: { + duk_activation *act; + duk_tval *tv1; + duk_hstring *name; + + tv1 = DUK__CONSTP_BC(ins); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + + /* XXX: putvar takes a duk_tval pointer, which is awkward and + * should be reworked. + */ + + tv1 = DUK__REGP_A(ins); /* val */ + act = thr->callstack_curr; + duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT()); + break; + } + + case DUK_OP_DELVAR: { + duk_activation *act; + duk_tval *tv1; + duk_hstring *name; + duk_bool_t rc; + + tv1 = DUK__CONSTP_BC(ins); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + act = thr->callstack_curr; + rc = duk_js_delvar_activation(thr, act, name); + DUK__REPLACE_BOOL_A_BREAK(rc); + } + + case DUK_OP_JUMP: { + /* Note: without explicit cast to signed, MSVC will + * apparently generate a large positive jump when the + * bias-corrected value would normally be negative. + */ + curr_pc += (duk_int_fast_t) DUK_DEC_ABC(ins) - (duk_int_fast_t) DUK_BC_JUMP_BIAS; + break; + } + +#define DUK__RETURN_SHARED() do { \ + duk_small_uint_t ret_result; \ + /* duk__handle_return() is guaranteed never to throw, except \ + * for potential out-of-memory situations which will then \ + * propagate out of the executor longjmp handler. \ + */ \ + DUK_ASSERT(thr->ptr_curr_pc == NULL); \ + ret_result = duk__handle_return(thr, entry_act); \ + if (ret_result == DUK__RETHAND_RESTART) { \ + goto restart_execution; \ + } \ + DUK_ASSERT(ret_result == DUK__RETHAND_FINISHED); \ + return; \ + } while (0) +#if defined(DUK_USE_EXEC_PREFER_SIZE) + case DUK_OP_RETREG: + case DUK_OP_RETCONST: + case DUK_OP_RETCONSTN: + case DUK_OP_RETUNDEF: { + /* BC -> return value reg/const */ + + DUK__SYNC_AND_NULL_CURR_PC(); + + if (op == DUK_OP_RETREG) { + duk_push_tval(thr, DUK__REGP_BC(ins)); + } else if (op == DUK_OP_RETUNDEF) { + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); /* valstack policy */ + thr->valstack_top++; + } else { + DUK_ASSERT(op == DUK_OP_RETCONST || op == DUK_OP_RETCONSTN); + duk_push_tval(thr, DUK__CONSTP_BC(ins)); + } + + DUK__RETURN_SHARED(); + } +#else /* DUK_USE_EXEC_PREFER_SIZE */ + case DUK_OP_RETREG: { + duk_tval *tv; + + DUK__SYNC_AND_NULL_CURR_PC(); + tv = DUK__REGP_BC(ins); + DUK_TVAL_SET_TVAL(thr->valstack_top, tv); + DUK_TVAL_INCREF(thr, tv); + thr->valstack_top++; + DUK__RETURN_SHARED(); + } + /* This will be unused without refcounting. */ + case DUK_OP_RETCONST: { + duk_tval *tv; + + DUK__SYNC_AND_NULL_CURR_PC(); + tv = DUK__CONSTP_BC(ins); + DUK_TVAL_SET_TVAL(thr->valstack_top, tv); + DUK_TVAL_INCREF(thr, tv); + thr->valstack_top++; + DUK__RETURN_SHARED(); + } + case DUK_OP_RETCONSTN: { + duk_tval *tv; + + DUK__SYNC_AND_NULL_CURR_PC(); + tv = DUK__CONSTP_BC(ins); + DUK_TVAL_SET_TVAL(thr->valstack_top, tv); +#if defined(DUK_USE_REFERENCE_COUNTING) + /* Without refcounting only RETCONSTN is used. */ + DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv)); /* no INCREF for this constant */ +#endif + thr->valstack_top++; + DUK__RETURN_SHARED(); + } + case DUK_OP_RETUNDEF: { + DUK__SYNC_AND_NULL_CURR_PC(); + thr->valstack_top++; /* value at valstack top is already undefined by valstack policy */ + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(thr->valstack_top)); + DUK__RETURN_SHARED(); + } +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + + case DUK_OP_LABEL: { + duk_activation *act; + duk_catcher *cat; + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); + + /* Allocate catcher and populate it (must be atomic). */ + + cat = duk_hthread_catcher_alloc(thr); + DUK_ASSERT(cat != NULL); + + cat->flags = (duk_uint32_t) (DUK_CAT_TYPE_LABEL | (bc << DUK_CAT_LABEL_SHIFT)); + cat->pc_base = (duk_instr_t *) curr_pc; /* pre-incremented, points to first jump slot */ + cat->idx_base = 0; /* unused for label */ + cat->h_varname = NULL; + + act = thr->callstack_curr; + DUK_ASSERT(act != NULL); + cat->parent = act->cat; + act->cat = cat; + + DUK_DDD(DUK_DDDPRINT("LABEL catcher: flags=0x%08lx, pc_base=%ld, " + "idx_base=%ld, h_varname=%!O, label_id=%ld", + (long) cat->flags, (long) cat->pc_base, + (long) cat->idx_base, (duk_heaphdr *) cat->h_varname, (long) DUK_CAT_GET_LABEL(cat))); + + curr_pc += 2; /* skip jump slots */ + break; + } + + case DUK_OP_ENDLABEL: { + duk_activation *act; +#if (defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2)) || defined(DUK_USE_ASSERTIONS) + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); +#endif +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + DUK_DDD(DUK_DDDPRINT("ENDLABEL %ld", (long) bc)); +#endif + + act = thr->callstack_curr; + DUK_ASSERT(act->cat != NULL); + DUK_ASSERT(DUK_CAT_GET_TYPE(act->cat) == DUK_CAT_TYPE_LABEL); + DUK_ASSERT((duk_uint_fast_t) DUK_CAT_GET_LABEL(act->cat) == bc); + duk_hthread_catcher_unwind_nolexenv_norz(thr, act); + + /* no need to unwind callstack */ + break; + } + + case DUK_OP_BREAK: { + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); + + DUK__SYNC_AND_NULL_CURR_PC(); + duk__handle_break_or_continue(thr, (duk_uint_t) bc, DUK_LJ_TYPE_BREAK); + goto restart_execution; + } + + case DUK_OP_CONTINUE: { + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); + + DUK__SYNC_AND_NULL_CURR_PC(); + duk__handle_break_or_continue(thr, (duk_uint_t) bc, DUK_LJ_TYPE_CONTINUE); + goto restart_execution; + } + + /* XXX: move to helper, too large to be inline here */ + case DUK_OP_TRYCATCH: { + duk__handle_op_trycatch(thr, ins, curr_pc); + curr_pc += 2; /* skip jump slots */ + break; + } + + case DUK_OP_ENDTRY: { + curr_pc = duk__handle_op_endtry(thr, ins); + break; + } + + case DUK_OP_ENDCATCH: { + duk__handle_op_endcatch(thr, ins); + break; + } + + case DUK_OP_ENDFIN: { + /* Sync and NULL early. */ + DUK__SYNC_AND_NULL_CURR_PC(); + + if (duk__handle_op_endfin(thr, ins, entry_act) != 0) { + return; + } + + /* Must restart because we NULLed out curr_pc. */ + goto restart_execution; + } + + case DUK_OP_THROW: { + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); + + /* Note: errors are augmented when they are created, not + * when they are thrown. So, don't augment here, it would + * break re-throwing for instance. + */ + + /* Sync so that augmentation sees up-to-date activations, NULL + * thr->ptr_curr_pc so that it's not used if side effects occur + * in augmentation or longjmp handling. + */ + DUK__SYNC_AND_NULL_CURR_PC(); + + duk_dup(thr, (duk_idx_t) bc); + DUK_DDD(DUK_DDDPRINT("THROW ERROR (BYTECODE): %!dT (before throw augment)", + (duk_tval *) duk_get_tval(thr, -1))); +#if defined(DUK_USE_AUGMENT_ERROR_THROW) + duk_err_augment_error_throw(thr); + DUK_DDD(DUK_DDDPRINT("THROW ERROR (BYTECODE): %!dT (after throw augment)", + (duk_tval *) duk_get_tval(thr, -1))); +#endif + + duk_err_setup_ljstate1(thr, DUK_LJ_TYPE_THROW, DUK_GET_TVAL_NEGIDX(thr, -1)); +#if defined(DUK_USE_DEBUGGER_SUPPORT) + duk_err_check_debugger_integration(thr); +#endif + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* always in executor */ + duk_err_longjmp(thr); + DUK_UNREACHABLE(); + break; + } + + case DUK_OP_CSREG: { + /* + * Assuming a register binds to a variable declared within this + * function (a declarative binding), the 'this' for the call + * setup is always 'undefined'. E5 Section 10.2.1.1.6. + */ + + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t bc = DUK_DEC_BC(ins); + + /* A -> register containing target function (not type checked here) + * BC -> target registers (BC, BC + 1) for call setup + */ + +#if defined(DUK_USE_PREFER_SIZE) + duk_dup(thr, (duk_idx_t) a); + duk_replace(thr, (duk_idx_t) bc); + duk_to_undefined(thr, (duk_idx_t) (bc + 1)); +#else + duk_tval *tv1; + duk_tval *tv2; + duk_tval *tv3; + duk_tval tv_tmp1; + duk_tval tv_tmp2; + + tv1 = DUK__REGP(bc); + tv2 = tv1 + 1; + DUK_TVAL_SET_TVAL(&tv_tmp1, tv1); + DUK_TVAL_SET_TVAL(&tv_tmp2, tv2); + tv3 = DUK__REGP(a); + DUK_TVAL_SET_TVAL(tv1, tv3); + DUK_TVAL_INCREF(thr, tv1); /* no side effects */ + DUK_TVAL_SET_UNDEFINED(tv2); /* no need for incref */ + DUK_TVAL_DECREF(thr, &tv_tmp1); + DUK_TVAL_DECREF(thr, &tv_tmp2); +#endif + break; + } + + + /* XXX: in some cases it's faster NOT to reuse the value + * stack but rather copy the arguments on top of the stack + * (mainly when the calling value stack is large and the value + * stack resize would be large). + */ + + case DUK_OP_CALL0: + case DUK_OP_CALL1: + case DUK_OP_CALL2: + case DUK_OP_CALL3: + case DUK_OP_CALL4: + case DUK_OP_CALL5: + case DUK_OP_CALL6: + case DUK_OP_CALL7: { + /* Opcode packs 4 flag bits: 1 for indirect, 3 map + * 1:1 to three lowest call handling flags. + * + * A -> nargs or register with nargs (indirect) + * BC -> base register for call (base -> func, base+1 -> this, base+2 -> arg1 ... base+2+N-1 -> argN) + */ + + duk_idx_t nargs; + duk_idx_t idx; + duk_small_uint_t call_flags; +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompfunc *fun; +#endif + + DUK_ASSERT((DUK_OP_CALL0 & 0x0fU) == 0); + DUK_ASSERT((ins & DUK_BC_CALL_FLAG_INDIRECT) == 0); + + nargs = (duk_idx_t) DUK_DEC_A(ins); + call_flags = (ins & 0x07U) | DUK_CALL_FLAG_ALLOW_ECMATOECMA; + idx = (duk_idx_t) DUK_DEC_BC(ins); + + if (duk__executor_handle_call(thr, idx, nargs, call_flags)) { + /* curr_pc synced by duk_handle_call_unprotected() */ + DUK_ASSERT(thr->ptr_curr_pc == NULL); + goto restart_execution; + } + DUK_ASSERT(thr->ptr_curr_pc != NULL); + + /* duk_js_call.c is required to restore the stack reserve + * so we only need to reset the top. + */ +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + fun = DUK__FUN(); +#endif + duk_set_top_unsafe(thr, (duk_idx_t) fun->nregs); + + /* No need to reinit setjmp() catchpoint, as call handling + * will store and restore our state. + * + * When debugger is enabled, we need to recheck the activation + * status after returning. This is now handled by call handling + * and heap->dbg_force_restart. + */ + break; + } + + case DUK_OP_CALL8: + case DUK_OP_CALL9: + case DUK_OP_CALL10: + case DUK_OP_CALL11: + case DUK_OP_CALL12: + case DUK_OP_CALL13: + case DUK_OP_CALL14: + case DUK_OP_CALL15: { + /* Indirect variant. */ + duk_uint_fast_t nargs; + duk_idx_t idx; + duk_small_uint_t call_flags; +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompfunc *fun; +#endif + + DUK_ASSERT((DUK_OP_CALL0 & 0x0fU) == 0); + DUK_ASSERT((ins & DUK_BC_CALL_FLAG_INDIRECT) != 0); + + nargs = (duk_uint_fast_t) DUK_DEC_A(ins); + DUK__LOOKUP_INDIRECT(nargs); + call_flags = (ins & 0x07U) | DUK_CALL_FLAG_ALLOW_ECMATOECMA; + idx = (duk_idx_t) DUK_DEC_BC(ins); + + if (duk__executor_handle_call(thr, idx, (duk_idx_t) nargs, call_flags)) { + DUK_ASSERT(thr->ptr_curr_pc == NULL); + goto restart_execution; + } + DUK_ASSERT(thr->ptr_curr_pc != NULL); + +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + fun = DUK__FUN(); +#endif + duk_set_top_unsafe(thr, (duk_idx_t) fun->nregs); + break; + } + + case DUK_OP_NEWOBJ: { + duk_push_object(thr); +#if defined(DUK_USE_ASSERTIONS) + { + duk_hobject *h; + h = duk_require_hobject(thr, -1); + DUK_ASSERT(DUK_HOBJECT_GET_ESIZE(h) == 0); + DUK_ASSERT(DUK_HOBJECT_GET_ENEXT(h) == 0); + DUK_ASSERT(DUK_HOBJECT_GET_ASIZE(h) == 0); + DUK_ASSERT(DUK_HOBJECT_GET_HSIZE(h) == 0); + } +#endif +#if !defined(DUK_USE_PREFER_SIZE) + /* XXX: could do a direct props realloc, but need hash size */ + duk_hobject_resize_entrypart(thr, duk_known_hobject(thr, -1), DUK_DEC_A(ins)); +#endif + DUK__REPLACE_TOP_BC_BREAK(); + } + + case DUK_OP_NEWARR: { + duk_push_array(thr); +#if defined(DUK_USE_ASSERTIONS) + { + duk_hobject *h; + h = duk_require_hobject(thr, -1); + DUK_ASSERT(DUK_HOBJECT_GET_ESIZE(h) == 0); + DUK_ASSERT(DUK_HOBJECT_GET_ENEXT(h) == 0); + DUK_ASSERT(DUK_HOBJECT_GET_ASIZE(h) == 0); + DUK_ASSERT(DUK_HOBJECT_GET_HSIZE(h) == 0); + DUK_ASSERT(DUK_HOBJECT_HAS_ARRAY_PART(h)); + } +#endif +#if !defined(DUK_USE_PREFER_SIZE) + duk_hobject_realloc_props(thr, + duk_known_hobject(thr, -1), + 0 /*new_e_size*/, + DUK_DEC_A(ins) /*new_a_size*/, + 0 /*new_h_size*/, + 0 /*abandon_array*/); +#if 0 + duk_hobject_resize_arraypart(thr, duk_known_hobject(thr, -1), DUK_DEC_A(ins)); +#endif +#endif + DUK__REPLACE_TOP_BC_BREAK(); + } + + case DUK_OP_MPUTOBJ: + case DUK_OP_MPUTOBJI: { + duk_idx_t obj_idx; + duk_uint_fast_t idx, idx_end; + duk_small_uint_fast_t count; + + /* A -> register of target object + * B -> first register of key/value pair list + * or register containing first register number if indirect + * C -> number of key/value pairs * 2 + * (= number of value stack indices used starting from 'B') + */ + + obj_idx = DUK_DEC_A(ins); + DUK_ASSERT(duk_is_object(thr, obj_idx)); + + idx = (duk_uint_fast_t) DUK_DEC_B(ins); + if (DUK_DEC_OP(ins) == DUK_OP_MPUTOBJI) { + DUK__LOOKUP_INDIRECT(idx); + } + + count = (duk_small_uint_fast_t) DUK_DEC_C(ins); + DUK_ASSERT(count > 0); /* compiler guarantees */ + idx_end = idx + count; + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (DUK_UNLIKELY(idx_end > (duk_uint_fast_t) duk_get_top(thr))) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("MPUTOBJ out of bounds"); + } +#endif + + /* Use 'force' flag to duk_def_prop() to ensure that any + * inherited properties don't prevent the operation. + * With ES2015 duplicate properties are allowed, so that we + * must overwrite any previous data or accessor property. + * + * With ES2015 computed property names the literal keys + * may be arbitrary values and need to be ToPropertyKey() + * coerced at runtime. + */ + do { + /* XXX: faster initialization (direct access or better primitives) */ + duk_dup(thr, (duk_idx_t) idx); + duk_dup(thr, (duk_idx_t) (idx + 1)); + duk_def_prop(thr, obj_idx, DUK_DEFPROP_HAVE_VALUE | + DUK_DEFPROP_FORCE | + DUK_DEFPROP_SET_WRITABLE | + DUK_DEFPROP_SET_ENUMERABLE | + DUK_DEFPROP_SET_CONFIGURABLE); + idx += 2; + } while (idx < idx_end); + break; + } + + case DUK_OP_INITSET: + case DUK_OP_INITGET: { + duk__handle_op_initset_initget(thr, ins); + break; + } + + case DUK_OP_MPUTARR: + case DUK_OP_MPUTARRI: { + duk_idx_t obj_idx; + duk_uint_fast_t idx, idx_end; + duk_small_uint_fast_t count; + duk_tval *tv1; + duk_uint32_t arr_idx; + + /* A -> register of target object + * B -> first register of value data (start_index, value1, value2, ..., valueN) + * or register containing first register number if indirect + * C -> number of key/value pairs (N) + */ + + obj_idx = DUK_DEC_A(ins); + DUK_ASSERT(duk_is_object(thr, obj_idx)); + + idx = (duk_uint_fast_t) DUK_DEC_B(ins); + if (DUK_DEC_OP(ins) == DUK_OP_MPUTARRI) { + DUK__LOOKUP_INDIRECT(idx); + } + + count = (duk_small_uint_fast_t) DUK_DEC_C(ins); + DUK_ASSERT(count > 0 + 1); /* compiler guarantees */ + idx_end = idx + count; + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx_end > (duk_uint_fast_t) duk_get_top(thr)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("MPUTARR out of bounds"); + } +#endif + + tv1 = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1)); + arr_idx = (duk_uint32_t) DUK_TVAL_GET_FASTINT_U32(tv1); +#else + arr_idx = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv1); +#endif + idx++; + + do { + /* duk_xdef_prop() will define an own property without any array + * special behaviors. We'll need to set the array length explicitly + * in the end. For arrays with elisions, the compiler will emit an + * explicit SETALEN which will update the length. + */ + + /* XXX: because we're dealing with 'own' properties of a fresh array, + * the array initializer should just ensure that the array has a large + * enough array part and write the values directly into array part, + * and finally set 'length' manually in the end (as already happens now). + */ + + duk_dup(thr, (duk_idx_t) idx); + duk_xdef_prop_index_wec(thr, obj_idx, arr_idx); + + idx++; + arr_idx++; + } while (idx < idx_end); + + /* XXX: E5.1 Section 11.1.4 coerces the final length through + * ToUint32() which is odd but happens now as a side effect of + * 'arr_idx' type. + */ + duk_set_length(thr, obj_idx, (duk_size_t) (duk_uarridx_t) arr_idx); + break; + } + + case DUK_OP_SETALEN: { + duk_tval *tv1; + duk_hobject *h; + duk_uint32_t len; + + tv1 = DUK__REGP_A(ins); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1)); + h = DUK_TVAL_GET_OBJECT(tv1); + DUK_ASSERT(DUK_HOBJECT_IS_ARRAY(h)); + + tv1 = DUK__REGP_BC(ins); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1)); + len = (duk_uint32_t) DUK_TVAL_GET_FASTINT_U32(tv1); +#else + len = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv1); +#endif + ((duk_harray *) h)->length = len; + break; + } + + case DUK_OP_INITENUM: { + duk__handle_op_initenum(thr, ins); + break; + } + + case DUK_OP_NEXTENUM: { + curr_pc += duk__handle_op_nextenum(thr, ins); + break; + } + + case DUK_OP_INVLHS: { + DUK_ERROR_REFERENCE(thr, DUK_STR_INVALID_LVALUE); + DUK_WO_NORETURN(return;); + break; + } + + case DUK_OP_DEBUGGER: { + /* Opcode only emitted by compiler when debugger + * support is enabled. Ignore it silently without + * debugger support, in case it has been loaded + * from precompiled bytecode. + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (duk_debug_is_attached(thr->heap)) { + DUK_D(DUK_DPRINT("DEBUGGER statement encountered, halt execution")); + DUK__SYNC_AND_NULL_CURR_PC(); + duk_debug_halt_execution(thr, 1 /*use_prev_pc*/); + DUK_D(DUK_DPRINT("DEBUGGER statement finished, resume execution")); + goto restart_execution; + } else { + DUK_D(DUK_DPRINT("DEBUGGER statement ignored, debugger not attached")); + } +#else + DUK_D(DUK_DPRINT("DEBUGGER statement ignored, no debugger support")); +#endif + break; + } + + case DUK_OP_NOP: { + /* Nop, ignored, but ABC fields may carry a value e.g. + * for indirect opcode handling. + */ + break; + } + + case DUK_OP_INVALID: { + DUK_ERROR_FMT1(thr, DUK_ERR_ERROR, "INVALID opcode (%ld)", (long) DUK_DEC_ABC(ins)); + DUK_WO_NORETURN(return;); + break; + } + +#if defined(DUK_USE_ES6) + case DUK_OP_NEWTARGET: { + duk_push_new_target(thr); + DUK__REPLACE_TOP_BC_BREAK(); + } +#endif /* DUK_USE_ES6 */ + +#if !defined(DUK_USE_EXEC_PREFER_SIZE) +#if !defined(DUK_USE_ES7_EXP_OPERATOR) + case DUK_OP_EXP_RR: + case DUK_OP_EXP_CR: + case DUK_OP_EXP_RC: + case DUK_OP_EXP_CC: +#endif +#if !defined(DUK_USE_ES6) + case DUK_OP_NEWTARGET: +#endif +#if !defined(DUK_USE_VERBOSE_ERRORS) + case DUK_OP_GETPROPC_RR: + case DUK_OP_GETPROPC_CR: + case DUK_OP_GETPROPC_RC: + case DUK_OP_GETPROPC_CC: +#endif + case DUK_OP_UNUSED207: + case DUK_OP_UNUSED212: + case DUK_OP_UNUSED213: + case DUK_OP_UNUSED214: + case DUK_OP_UNUSED215: + case DUK_OP_UNUSED216: + case DUK_OP_UNUSED217: + case DUK_OP_UNUSED218: + case DUK_OP_UNUSED219: + case DUK_OP_UNUSED220: + case DUK_OP_UNUSED221: + case DUK_OP_UNUSED222: + case DUK_OP_UNUSED223: + case DUK_OP_UNUSED224: + case DUK_OP_UNUSED225: + case DUK_OP_UNUSED226: + case DUK_OP_UNUSED227: + case DUK_OP_UNUSED228: + case DUK_OP_UNUSED229: + case DUK_OP_UNUSED230: + case DUK_OP_UNUSED231: + case DUK_OP_UNUSED232: + case DUK_OP_UNUSED233: + case DUK_OP_UNUSED234: + case DUK_OP_UNUSED235: + case DUK_OP_UNUSED236: + case DUK_OP_UNUSED237: + case DUK_OP_UNUSED238: + case DUK_OP_UNUSED239: + case DUK_OP_UNUSED240: + case DUK_OP_UNUSED241: + case DUK_OP_UNUSED242: + case DUK_OP_UNUSED243: + case DUK_OP_UNUSED244: + case DUK_OP_UNUSED245: + case DUK_OP_UNUSED246: + case DUK_OP_UNUSED247: + case DUK_OP_UNUSED248: + case DUK_OP_UNUSED249: + case DUK_OP_UNUSED250: + case DUK_OP_UNUSED251: + case DUK_OP_UNUSED252: + case DUK_OP_UNUSED253: + case DUK_OP_UNUSED254: + case DUK_OP_UNUSED255: + /* Force all case clauses to map to an actual handler + * so that the compiler can emit a jump without a bounds + * check: the switch argument is a duk_uint8_t so that + * the compiler may be able to figure it out. This is + * a small detail and obviously compiler dependent. + */ + /* default: clause omitted on purpose */ +#else /* DUK_USE_EXEC_PREFER_SIZE */ + default: +#endif /* DUK_USE_EXEC_PREFER_SIZE */ + { + /* Default case catches invalid/unsupported opcodes. */ + DUK_D(DUK_DPRINT("invalid opcode: %ld - %!I", (long) op, ins)); + DUK__INTERNAL_ERROR("invalid opcode"); + break; + } + + } /* end switch */ + + continue; + + /* Some shared exit paths for opcode handling below. These + * are mostly useful to reduce code footprint when multiple + * opcodes have a similar epilogue (like replacing stack top + * with index 'a'). + */ + +#if defined(DUK_USE_EXEC_PREFER_SIZE) + replace_top_a: + DUK__REPLACE_TO_TVPTR(thr, DUK__REGP_A(ins)); + continue; + replace_top_bc: + DUK__REPLACE_TO_TVPTR(thr, DUK__REGP_BC(ins)); + continue; +#endif + } + DUK_WO_NORETURN(return;); + +#if !defined(DUK_USE_VERBOSE_EXECUTOR_ERRORS) + internal_error: + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return;); +#endif +} + +/* automatic undefs */ +#undef DUK__BYTEOFF_A +#undef DUK__BYTEOFF_B +#undef DUK__BYTEOFF_BC +#undef DUK__BYTEOFF_C +#undef DUK__COMPARE_BODY +#undef DUK__CONST +#undef DUK__CONSTP +#undef DUK__CONSTP_A +#undef DUK__CONSTP_B +#undef DUK__CONSTP_BC +#undef DUK__CONSTP_C +#undef DUK__DELPROP_BODY +#undef DUK__EQ_BODY +#undef DUK__FUN +#undef DUK__GETPROPC_BODY +#undef DUK__GETPROP_BODY +#undef DUK__GE_BODY +#undef DUK__GT_BODY +#undef DUK__INLINE_PERF +#undef DUK__INSTOF_BODY +#undef DUK__INTERNAL_ERROR +#undef DUK__INT_NOACTION +#undef DUK__INT_RESTART +#undef DUK__IN_BODY +#undef DUK__LE_BODY +#undef DUK__LONGJMP_RESTART +#undef DUK__LONGJMP_RETHROW +#undef DUK__LOOKUP_INDIRECT +#undef DUK__LT_BODY +#undef DUK__MASK_A +#undef DUK__MASK_B +#undef DUK__MASK_BC +#undef DUK__MASK_C +#undef DUK__NEQ_BODY +#undef DUK__NOINLINE_PERF +#undef DUK__PUTPROP_BODY +#undef DUK__RCBIT_B +#undef DUK__RCBIT_C +#undef DUK__REG +#undef DUK__REGCONSTP_B +#undef DUK__REGCONSTP_C +#undef DUK__REGP +#undef DUK__REGP_A +#undef DUK__REGP_B +#undef DUK__REGP_BC +#undef DUK__REGP_C +#undef DUK__REPLACE_BOOL_A_BREAK +#undef DUK__REPLACE_TOP_A_BREAK +#undef DUK__REPLACE_TOP_BC_BREAK +#undef DUK__REPLACE_TO_TVPTR +#undef DUK__RETHAND_FINISHED +#undef DUK__RETHAND_RESTART +#undef DUK__RETURN_SHARED +#undef DUK__SEQ_BODY +#undef DUK__SHIFT_A +#undef DUK__SHIFT_B +#undef DUK__SHIFT_BC +#undef DUK__SHIFT_C +#undef DUK__SNEQ_BODY +#undef DUK__STRICT +#undef DUK__SYNC_AND_NULL_CURR_PC +#undef DUK__SYNC_CURR_PC +#undef DUK__TVAL_SHIFT +#line 1 "duk_js_ops.c" +/* + * ECMAScript specification algorithm and conversion helpers. + * + * These helpers encapsulate the primitive ECMAScript operation semantics, + * and are used by the bytecode executor and the API (among other places). + * Some primitives are only implemented as part of the API and have no + * "internal" helper. This is the case when an internal helper would not + * really be useful; e.g. the operation is rare, uses value stack heavily, + * etc. + * + * The operation arguments depend on what is required to implement + * the operation: + * + * - If an operation is simple and stateless, and has no side + * effects, it won't take an duk_hthread argument and its + * arguments may be duk_tval pointers (which are safe as long + * as no side effects take place). + * + * - If complex coercions are required (e.g. a "ToNumber" coercion) + * or errors may be thrown, the operation takes an duk_hthread + * argument. This also implies that the operation may have + * arbitrary side effects, invalidating any duk_tval pointers. + * + * - For operations with potential side effects, arguments can be + * taken in several ways: + * + * a) as duk_tval pointers, which makes sense if the "common case" + * can be resolved without side effects (e.g. coercion); the + * arguments are pushed to the valstack for coercion if + * necessary + * + * b) as duk_tval values + * + * c) implicitly on value stack top + * + * d) as indices to the value stack + * + * Future work: + * + * - Argument styles may not be the most sensible in every case now. + * + * - In-place coercions might be useful for several operations, if + * in-place coercion is OK for the bytecode executor and the API. + */ + +/* #include duk_internal.h -> already included */ + +/* + * ToPrimitive() (E5 Section 9.1) + * + * ==> implemented in the API. + */ + +/* + * ToBoolean() (E5 Section 9.2) + */ + +DUK_INTERNAL duk_bool_t duk_js_toboolean(duk_tval *tv) { + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: + return 0; + case DUK_TAG_BOOLEAN: + DUK_ASSERT(DUK_TVAL_GET_BOOLEAN(tv) == 0 || DUK_TVAL_GET_BOOLEAN(tv) == 1); + return DUK_TVAL_GET_BOOLEAN(tv); + case DUK_TAG_STRING: { + /* Symbols ToBoolean() coerce to true, regardless of their + * description. This happens with no explicit check because + * of the symbol representation byte prefix. + */ + duk_hstring *h = DUK_TVAL_GET_STRING(tv); + DUK_ASSERT(h != NULL); + return (DUK_HSTRING_GET_BYTELEN(h) > 0 ? 1 : 0); + } + case DUK_TAG_OBJECT: { + return 1; + } + case DUK_TAG_BUFFER: { + /* Mimic Uint8Array semantics: objects coerce true, regardless + * of buffer length (zero or not) or context. + */ + return 1; + } + case DUK_TAG_POINTER: { + void *p = DUK_TVAL_GET_POINTER(tv); + return (p != NULL ? 1 : 0); + } + case DUK_TAG_LIGHTFUNC: { + return 1; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: + if (DUK_TVAL_GET_FASTINT(tv) != 0) { + return 1; + } else { + return 0; + } +#endif + default: { + /* number */ + duk_double_t d; +#if defined(DUK_USE_PREFER_SIZE) + int c; +#endif + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_DOUBLE(tv)); + d = DUK_TVAL_GET_DOUBLE(tv); +#if defined(DUK_USE_PREFER_SIZE) + c = DUK_FPCLASSIFY((double) d); + if (c == DUK_FP_ZERO || c == DUK_FP_NAN) { + return 0; + } else { + return 1; + } +#else + DUK_ASSERT(duk_double_is_nan_or_zero(d) == 0 || duk_double_is_nan_or_zero(d) == 1); + return duk_double_is_nan_or_zero(d) ^ 1; +#endif + } + } + DUK_UNREACHABLE(); +} + +/* + * ToNumber() (E5 Section 9.3) + * + * Value to convert must be on stack top, and is popped before exit. + * + * See: http://www.cs.indiana.edu/~burger/FP-Printing-PLDI96.pdf + * http://www.cs.indiana.edu/~burger/fp/index.html + * + * Notes on the conversion: + * + * - There are specific requirements on the accuracy of the conversion + * through a "Mathematical Value" (MV), so this conversion is not + * trivial. + * + * - Quick rejects (e.g. based on first char) are difficult because + * the grammar allows leading and trailing white space. + * + * - Quick reject based on string length is difficult even after + * accounting for white space; there may be arbitrarily many + * decimal digits. + * + * - Standard grammar allows decimal values ("123"), hex values + * ("0x123") and infinities + * + * - Unlike source code literals, ToNumber() coerces empty strings + * and strings with only whitespace to zero (not NaN). + */ + +/* E5 Section 9.3.1 */ +DUK_LOCAL duk_double_t duk__tonumber_string_raw(duk_hthread *thr) { + duk_small_uint_t s2n_flags; + duk_double_t d; + + DUK_ASSERT(duk_is_string(thr, -1)); + + /* Quite lenient, e.g. allow empty as zero, but don't allow trailing + * garbage. + */ + s2n_flags = DUK_S2N_FLAG_TRIM_WHITE | + DUK_S2N_FLAG_ALLOW_EXP | + DUK_S2N_FLAG_ALLOW_PLUS | + DUK_S2N_FLAG_ALLOW_MINUS | + DUK_S2N_FLAG_ALLOW_INF | + DUK_S2N_FLAG_ALLOW_FRAC | + DUK_S2N_FLAG_ALLOW_NAKED_FRAC | + DUK_S2N_FLAG_ALLOW_EMPTY_FRAC | + DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO | + DUK_S2N_FLAG_ALLOW_LEADING_ZERO | + DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT | + DUK_S2N_FLAG_ALLOW_AUTO_OCT_INT | + DUK_S2N_FLAG_ALLOW_AUTO_BIN_INT; + + duk_numconv_parse(thr, 10 /*radix*/, s2n_flags); + +#if defined(DUK_USE_PREFER_SIZE) + d = duk_get_number(thr, -1); + duk_pop_unsafe(thr); +#else + thr->valstack_top--; + DUK_ASSERT(DUK_TVAL_IS_NUMBER(thr->valstack_top)); + DUK_ASSERT(DUK_TVAL_IS_DOUBLE(thr->valstack_top)); /* no fastint conversion in numconv now */ + DUK_ASSERT(!DUK_TVAL_NEEDS_REFCOUNT_UPDATE(thr->valstack_top)); + d = DUK_TVAL_GET_DOUBLE(thr->valstack_top); /* assumes not a fastint */ + DUK_TVAL_SET_UNDEFINED(thr->valstack_top); +#endif + + return d; +} + +DUK_INTERNAL duk_double_t duk_js_tonumber(duk_hthread *thr, duk_tval *tv) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv != NULL); + + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_UNDEFINED: { + /* return a specific NaN (although not strictly necessary) */ + duk_double_union du; + DUK_DBLUNION_SET_NAN(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + return du.d; + } + case DUK_TAG_NULL: { + /* +0.0 */ + return 0.0; + } + case DUK_TAG_BOOLEAN: { + if (DUK_TVAL_IS_BOOLEAN_TRUE(tv)) { + return 1.0; + } + return 0.0; + } + case DUK_TAG_STRING: { + /* For Symbols ToNumber() is always a TypeError. */ + duk_hstring *h = DUK_TVAL_GET_STRING(tv); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(h))) { + DUK_ERROR_TYPE(thr, DUK_STR_CANNOT_NUMBER_COERCE_SYMBOL); + DUK_WO_NORETURN(return 0.0;); + } + duk_push_hstring(thr, h); + return duk__tonumber_string_raw(thr); + } + case DUK_TAG_BUFFER: /* plain buffer treated like object */ + case DUK_TAG_OBJECT: { + duk_double_t d; + duk_push_tval(thr, tv); + duk_to_primitive(thr, -1, DUK_HINT_NUMBER); /* 'tv' becomes invalid */ + + /* recursive call for a primitive value (guaranteed not to cause second + * recursion). + */ + DUK_ASSERT(duk_get_tval(thr, -1) != NULL); + d = duk_js_tonumber(thr, duk_get_tval(thr, -1)); + + duk_pop_unsafe(thr); + return d; + } + case DUK_TAG_POINTER: { + /* Coerce like boolean */ + void *p = DUK_TVAL_GET_POINTER(tv); + return (p != NULL ? 1.0 : 0.0); + } + case DUK_TAG_LIGHTFUNC: { + /* +(function(){}) -> NaN */ + return DUK_DOUBLE_NAN; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: + return (duk_double_t) DUK_TVAL_GET_FASTINT(tv); +#endif + default: { + /* number */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv)); + DUK_ASSERT(DUK_TVAL_IS_DOUBLE(tv)); + return DUK_TVAL_GET_DOUBLE(tv); + } + } + + DUK_UNREACHABLE(); +} + +/* + * ToInteger() (E5 Section 9.4) + */ + +/* exposed, used by e.g. duk_bi_date.c */ +DUK_INTERNAL duk_double_t duk_js_tointeger_number(duk_double_t x) { +#if defined(DUK_USE_PREFER_SIZE) + duk_small_int_t c = (duk_small_int_t) DUK_FPCLASSIFY(x); + + if (DUK_UNLIKELY(c == DUK_FP_NAN)) { + return 0.0; + } else if (DUK_UNLIKELY(c == DUK_FP_INFINITE)) { + return x; + } else { + /* Finite, including neg/pos zero. Neg zero sign must be + * preserved. + */ + return duk_double_trunc_towards_zero(x); + } +#else /* DUK_USE_PREFER_SIZE */ + /* NaN and Infinity have the same exponent so it's a cheap + * initial check for the rare path. + */ + if (DUK_UNLIKELY(duk_double_is_nan_or_inf(x) != 0U)) { + if (duk_double_is_nan(x)) { + return 0.0; + } else { + return x; + } + } else { + return duk_double_trunc_towards_zero(x); + } +#endif /* DUK_USE_PREFER_SIZE */ +} + +DUK_INTERNAL duk_double_t duk_js_tointeger(duk_hthread *thr, duk_tval *tv) { + /* XXX: fastint */ + duk_double_t d = duk_js_tonumber(thr, tv); /* invalidates tv */ + return duk_js_tointeger_number(d); +} + +/* + * ToInt32(), ToUint32(), ToUint16() (E5 Sections 9.5, 9.6, 9.7) + */ + +/* combined algorithm matching E5 Sections 9.5 and 9.6 */ +DUK_LOCAL duk_double_t duk__toint32_touint32_helper(duk_double_t x, duk_bool_t is_toint32) { +#if defined (DUK_USE_PREFER_SIZE) + duk_small_int_t c; +#endif + +#if defined (DUK_USE_PREFER_SIZE) + c = (duk_small_int_t) DUK_FPCLASSIFY(x); + if (c == DUK_FP_NAN || c == DUK_FP_ZERO || c == DUK_FP_INFINITE) { + return 0.0; + } +#else + if (duk_double_is_nan_zero_inf(x)) { + return 0.0; + } +#endif + + /* x = sign(x) * floor(abs(x)), i.e. truncate towards zero, keep sign */ + x = duk_double_trunc_towards_zero(x); + + /* NOTE: fmod(x) result sign is same as sign of x, which + * differs from what Javascript wants (see Section 9.6). + */ + + x = DUK_FMOD(x, DUK_DOUBLE_2TO32); /* -> x in ]-2**32, 2**32[ */ + + if (x < 0.0) { + x += DUK_DOUBLE_2TO32; + } + DUK_ASSERT(x >= 0 && x < DUK_DOUBLE_2TO32); /* -> x in [0, 2**32[ */ + + if (is_toint32) { + if (x >= DUK_DOUBLE_2TO31) { + /* x in [2**31, 2**32[ */ + + x -= DUK_DOUBLE_2TO32; /* -> x in [-2**31,2**31[ */ + } + } + + return x; +} + +DUK_INTERNAL duk_int32_t duk_js_toint32(duk_hthread *thr, duk_tval *tv) { + duk_double_t d; + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + return DUK_TVAL_GET_FASTINT_I32(tv); + } +#endif + + d = duk_js_tonumber(thr, tv); /* invalidates tv */ + d = duk__toint32_touint32_helper(d, 1); + DUK_ASSERT(DUK_FPCLASSIFY(d) == DUK_FP_ZERO || DUK_FPCLASSIFY(d) == DUK_FP_NORMAL); + DUK_ASSERT(d >= -2147483648.0 && d <= 2147483647.0); /* [-0x80000000,0x7fffffff] */ + DUK_ASSERT(d == ((duk_double_t) ((duk_int32_t) d))); /* whole, won't clip */ + return (duk_int32_t) d; +} + + +DUK_INTERNAL duk_uint32_t duk_js_touint32(duk_hthread *thr, duk_tval *tv) { + duk_double_t d; + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv)) { + return DUK_TVAL_GET_FASTINT_U32(tv); + } +#endif + + d = duk_js_tonumber(thr, tv); /* invalidates tv */ + d = duk__toint32_touint32_helper(d, 0); + DUK_ASSERT(DUK_FPCLASSIFY(d) == DUK_FP_ZERO || DUK_FPCLASSIFY(d) == DUK_FP_NORMAL); + DUK_ASSERT(d >= 0.0 && d <= 4294967295.0); /* [0x00000000, 0xffffffff] */ + DUK_ASSERT(d == ((duk_double_t) ((duk_uint32_t) d))); /* whole, won't clip */ + return (duk_uint32_t) d; + +} + +DUK_INTERNAL duk_uint16_t duk_js_touint16(duk_hthread *thr, duk_tval *tv) { + /* should be a safe way to compute this */ + return (duk_uint16_t) (duk_js_touint32(thr, tv) & 0x0000ffffU); +} + +/* + * ToString() (E5 Section 9.8) + * ToObject() (E5 Section 9.9) + * CheckObjectCoercible() (E5 Section 9.10) + * IsCallable() (E5 Section 9.11) + * + * ==> implemented in the API. + */ + +/* + * Loose equality, strict equality, and SameValue (E5 Sections 11.9.1, 11.9.4, + * 9.12). These have much in common so they can share some helpers. + * + * Future work notes: + * + * - Current implementation (and spec definition) has recursion; this should + * be fixed if possible. + * + * - String-to-number coercion should be possible without going through the + * value stack (and be more compact) if a shared helper is invoked. + */ + +/* Note that this is the same operation for strict and loose equality: + * - E5 Section 11.9.3, step 1.c (loose) + * - E5 Section 11.9.6, step 4 (strict) + */ + +DUK_LOCAL duk_bool_t duk__js_equals_number(duk_double_t x, duk_double_t y) { +#if defined(DUK_USE_PARANOID_MATH) + /* Straightforward algorithm, makes fewer compiler assumptions. */ + duk_small_int_t cx = (duk_small_int_t) DUK_FPCLASSIFY(x); + duk_small_int_t cy = (duk_small_int_t) DUK_FPCLASSIFY(y); + if (cx == DUK_FP_NAN || cy == DUK_FP_NAN) { + return 0; + } + if (cx == DUK_FP_ZERO && cy == DUK_FP_ZERO) { + return 1; + } + if (x == y) { + return 1; + } + return 0; +#else /* DUK_USE_PARANOID_MATH */ + /* Better equivalent algorithm. If the compiler is compliant, C and + * ECMAScript semantics are identical for this particular comparison. + * In particular, NaNs must never compare equal and zeroes must compare + * equal regardless of sign. Could also use a macro, but this inlines + * already nicely (no difference on gcc, for instance). + */ + if (x == y) { + /* IEEE requires that NaNs compare false */ + DUK_ASSERT(DUK_FPCLASSIFY(x) != DUK_FP_NAN); + DUK_ASSERT(DUK_FPCLASSIFY(y) != DUK_FP_NAN); + return 1; + } else { + /* IEEE requires that zeros compare the same regardless + * of their signed, so if both x and y are zeroes, they + * are caught above. + */ + DUK_ASSERT(!(DUK_FPCLASSIFY(x) == DUK_FP_ZERO && DUK_FPCLASSIFY(y) == DUK_FP_ZERO)); + return 0; + } +#endif /* DUK_USE_PARANOID_MATH */ +} + +DUK_LOCAL duk_bool_t duk__js_samevalue_number(duk_double_t x, duk_double_t y) { +#if defined(DUK_USE_PARANOID_MATH) + duk_small_int_t cx = (duk_small_int_t) DUK_FPCLASSIFY(x); + duk_small_int_t cy = (duk_small_int_t) DUK_FPCLASSIFY(y); + + if (cx == DUK_FP_NAN && cy == DUK_FP_NAN) { + /* SameValue(NaN, NaN) = true, regardless of NaN sign or extra bits */ + return 1; + } + if (cx == DUK_FP_ZERO && cy == DUK_FP_ZERO) { + /* Note: cannot assume that a non-zero return value of signbit() would + * always be the same -- hence cannot (portably) use something like: + * + * signbit(x) == signbit(y) + */ + duk_small_int_t sx = DUK_SIGNBIT(x) ? 1 : 0; + duk_small_int_t sy = DUK_SIGNBIT(y) ? 1 : 0; + return (sx == sy); + } + + /* normal comparison; known: + * - both x and y are not NaNs (but one of them can be) + * - both x and y are not zero (but one of them can be) + * - x and y may be denormal or infinite + */ + + return (x == y); +#else /* DUK_USE_PARANOID_MATH */ + duk_small_int_t cx = (duk_small_int_t) DUK_FPCLASSIFY(x); + duk_small_int_t cy = (duk_small_int_t) DUK_FPCLASSIFY(y); + + if (x == y) { + /* IEEE requires that NaNs compare false */ + DUK_ASSERT(DUK_FPCLASSIFY(x) != DUK_FP_NAN); + DUK_ASSERT(DUK_FPCLASSIFY(y) != DUK_FP_NAN); + + /* Using classification has smaller footprint than direct comparison. */ + if (DUK_UNLIKELY(cx == DUK_FP_ZERO && cy == DUK_FP_ZERO)) { + /* Note: cannot assume that a non-zero return value of signbit() would + * always be the same -- hence cannot (portably) use something like: + * + * signbit(x) == signbit(y) + */ + return duk_double_same_sign(x, y); + } + return 1; + } else { + /* IEEE requires that zeros compare the same regardless + * of their sign, so if both x and y are zeroes, they + * are caught above. + */ + DUK_ASSERT(!(DUK_FPCLASSIFY(x) == DUK_FP_ZERO && DUK_FPCLASSIFY(y) == DUK_FP_ZERO)); + + /* Difference to non-strict/strict comparison is that NaNs compare + * equal and signed zero signs matter. + */ + if (DUK_UNLIKELY(cx == DUK_FP_NAN && cy == DUK_FP_NAN)) { + /* SameValue(NaN, NaN) = true, regardless of NaN sign or extra bits */ + return 1; + } + return 0; + } +#endif /* DUK_USE_PARANOID_MATH */ +} + +DUK_INTERNAL duk_bool_t duk_js_equals_helper(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_t flags) { + duk_uint_t type_mask_x; + duk_uint_t type_mask_y; + + /* If flags != 0 (strict or SameValue), thr can be NULL. For loose + * equals comparison it must be != NULL. + */ + DUK_ASSERT(flags != 0 || thr != NULL); + + /* + * Same type? + * + * Note: since number values have no explicit tag in the 8-byte + * representation, need the awkward if + switch. + */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + if (DUK_TVAL_GET_FASTINT(tv_x) == DUK_TVAL_GET_FASTINT(tv_y)) { + return 1; + } else { + return 0; + } + } + else +#endif + if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) { + duk_double_t d1, d2; + + /* Catches both doubles and cases where only one argument is + * a fastint so can't assume a double. + */ + d1 = DUK_TVAL_GET_NUMBER(tv_x); + d2 = DUK_TVAL_GET_NUMBER(tv_y); + if (DUK_UNLIKELY((flags & DUK_EQUALS_FLAG_SAMEVALUE) != 0)) { + /* SameValue */ + return duk__js_samevalue_number(d1, d2); + } else { + /* equals and strict equals */ + return duk__js_equals_number(d1, d2); + } + } else if (DUK_TVAL_GET_TAG(tv_x) == DUK_TVAL_GET_TAG(tv_y)) { + switch (DUK_TVAL_GET_TAG(tv_x)) { + case DUK_TAG_UNDEFINED: + case DUK_TAG_NULL: { + return 1; + } + case DUK_TAG_BOOLEAN: { + return DUK_TVAL_GET_BOOLEAN(tv_x) == DUK_TVAL_GET_BOOLEAN(tv_y); + } + case DUK_TAG_POINTER: { + return DUK_TVAL_GET_POINTER(tv_x) == DUK_TVAL_GET_POINTER(tv_y); + } + case DUK_TAG_STRING: + case DUK_TAG_OBJECT: { + /* Heap pointer comparison suffices for strings and objects. + * Symbols compare equal if they have the same internal + * representation; again heap pointer comparison suffices. + */ + return DUK_TVAL_GET_HEAPHDR(tv_x) == DUK_TVAL_GET_HEAPHDR(tv_y); + } + case DUK_TAG_BUFFER: { + /* In Duktape 2.x plain buffers mimic Uint8Array objects + * so always compare by heap pointer. In Duktape 1.x + * strict comparison would compare heap pointers and + * non-strict would compare contents. + */ + return DUK_TVAL_GET_HEAPHDR(tv_x) == DUK_TVAL_GET_HEAPHDR(tv_y); + } + case DUK_TAG_LIGHTFUNC: { + /* At least 'magic' has a significant impact on function + * identity. + */ + duk_small_uint_t lf_flags_x; + duk_small_uint_t lf_flags_y; + duk_c_function func_x; + duk_c_function func_y; + + DUK_TVAL_GET_LIGHTFUNC(tv_x, func_x, lf_flags_x); + DUK_TVAL_GET_LIGHTFUNC(tv_y, func_y, lf_flags_y); + return ((func_x == func_y) && (lf_flags_x == lf_flags_y)) ? 1 : 0; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv_x)); + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv_y)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_x)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_y)); + DUK_UNREACHABLE(); + return 0; + } + } + } + + if ((flags & (DUK_EQUALS_FLAG_STRICT | DUK_EQUALS_FLAG_SAMEVALUE)) != 0) { + return 0; + } + + DUK_ASSERT(flags == 0); /* non-strict equality from here on */ + + /* + * Types are different; various cases for non-strict comparison + * + * Since comparison is symmetric, we use a "swap trick" to reduce + * code size. + */ + + type_mask_x = duk_get_type_mask_tval(tv_x); + type_mask_y = duk_get_type_mask_tval(tv_y); + + /* Undefined/null are considered equal (e.g. "null == undefined" -> true). */ + if ((type_mask_x & (DUK_TYPE_MASK_UNDEFINED | DUK_TYPE_MASK_NULL)) && + (type_mask_y & (DUK_TYPE_MASK_NULL | DUK_TYPE_MASK_UNDEFINED))) { + return 1; + } + + /* Number/string -> coerce string to number (e.g. "'1.5' == 1.5" -> true). */ + if ((type_mask_x & DUK_TYPE_MASK_NUMBER) && (type_mask_y & DUK_TYPE_MASK_STRING)) { + if (!DUK_TVAL_STRING_IS_SYMBOL(tv_y)) { + duk_double_t d1, d2; + d1 = DUK_TVAL_GET_NUMBER(tv_x); + d2 = duk_to_number_tval(thr, tv_y); + return duk__js_equals_number(d1, d2); + } + } + if ((type_mask_x & DUK_TYPE_MASK_STRING) && (type_mask_y & DUK_TYPE_MASK_NUMBER)) { + if (!DUK_TVAL_STRING_IS_SYMBOL(tv_x)) { + duk_double_t d1, d2; + d1 = DUK_TVAL_GET_NUMBER(tv_y); + d2 = duk_to_number_tval(thr, tv_x); + return duk__js_equals_number(d1, d2); + } + } + + /* Boolean/any -> coerce boolean to number and try again. If boolean is + * compared to a pointer, the final comparison after coercion now always + * yields false (as pointer vs. number compares to false), but this is + * not special cased. + * + * ToNumber(bool) is +1.0 or 0.0. Tagged boolean value is always 0 or 1. + */ + if (type_mask_x & DUK_TYPE_MASK_BOOLEAN) { + DUK_ASSERT(DUK_TVAL_GET_BOOLEAN(tv_x) == 0 || DUK_TVAL_GET_BOOLEAN(tv_x) == 1); + duk_push_uint(thr, DUK_TVAL_GET_BOOLEAN(tv_x)); + duk_push_tval(thr, tv_y); + goto recursive_call; + } + if (type_mask_y & DUK_TYPE_MASK_BOOLEAN) { + DUK_ASSERT(DUK_TVAL_GET_BOOLEAN(tv_y) == 0 || DUK_TVAL_GET_BOOLEAN(tv_y) == 1); + duk_push_tval(thr, tv_x); + duk_push_uint(thr, DUK_TVAL_GET_BOOLEAN(tv_y)); + goto recursive_call; + } + + /* String-number-symbol/object -> coerce object to primitive (apparently without hint), then try again. */ + if ((type_mask_x & (DUK_TYPE_MASK_STRING | DUK_TYPE_MASK_NUMBER)) && + (type_mask_y & DUK_TYPE_MASK_OBJECT)) { + /* No symbol check needed because symbols and strings are accepted. */ + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + duk_to_primitive(thr, -1, DUK_HINT_NONE); /* apparently no hint? */ + goto recursive_call; + } + if ((type_mask_x & DUK_TYPE_MASK_OBJECT) && + (type_mask_y & (DUK_TYPE_MASK_STRING | DUK_TYPE_MASK_NUMBER))) { + /* No symbol check needed because symbols and strings are accepted. */ + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + duk_to_primitive(thr, -2, DUK_HINT_NONE); /* apparently no hint? */ + goto recursive_call; + } + + /* Nothing worked -> not equal. */ + return 0; + + recursive_call: + /* Shared code path to call the helper again with arguments on stack top. */ + { + duk_bool_t rc; + rc = duk_js_equals_helper(thr, + DUK_GET_TVAL_NEGIDX(thr, -2), + DUK_GET_TVAL_NEGIDX(thr, -1), + 0 /*flags:nonstrict*/); + duk_pop_2_unsafe(thr); + return rc; + } +} + +/* + * Comparisons (x >= y, x > y, x <= y, x < y) + * + * E5 Section 11.8.5: implement 'x < y' and then use negate and eval_left_first + * flags to get the rest. + */ + +/* XXX: this should probably just operate on the stack top, because it + * needs to push stuff on the stack anyway... + */ + +DUK_INTERNAL duk_small_int_t duk_js_data_compare(const duk_uint8_t *buf1, const duk_uint8_t *buf2, duk_size_t len1, duk_size_t len2) { + duk_size_t prefix_len; + duk_small_int_t rc; + + prefix_len = (len1 <= len2 ? len1 : len2); + + /* duk_memcmp() is guaranteed to return zero (equal) for zero length + * inputs. + */ + rc = duk_memcmp_unsafe((const void *) buf1, + (const void *) buf2, + (size_t) prefix_len); + + if (rc < 0) { + return -1; + } else if (rc > 0) { + return 1; + } + + /* prefix matches, lengths matter now */ + if (len1 < len2) { + /* e.g. "x" < "xx" */ + return -1; + } else if (len1 > len2) { + return 1; + } + + return 0; +} + +DUK_INTERNAL duk_small_int_t duk_js_string_compare(duk_hstring *h1, duk_hstring *h2) { + /* + * String comparison (E5 Section 11.8.5, step 4), which + * needs to compare codepoint by codepoint. + * + * However, UTF-8 allows us to use strcmp directly: the shared + * prefix will be encoded identically (UTF-8 has unique encoding) + * and the first differing character can be compared with a simple + * unsigned byte comparison (which strcmp does). + * + * This will not work properly for non-xutf-8 strings, but this + * is not an issue for compliance. + */ + + DUK_ASSERT(h1 != NULL); + DUK_ASSERT(h2 != NULL); + + return duk_js_data_compare((const duk_uint8_t *) DUK_HSTRING_GET_DATA(h1), + (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h2), + (duk_size_t) DUK_HSTRING_GET_BYTELEN(h1), + (duk_size_t) DUK_HSTRING_GET_BYTELEN(h2)); +} + +#if 0 /* unused */ +DUK_INTERNAL duk_small_int_t duk_js_buffer_compare(duk_heap *heap, duk_hbuffer *h1, duk_hbuffer *h2) { + /* Similar to String comparison. */ + + DUK_ASSERT(h1 != NULL); + DUK_ASSERT(h2 != NULL); + DUK_UNREF(heap); + + return duk_js_data_compare((const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(heap, h1), + (const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(heap, h2), + (duk_size_t) DUK_HBUFFER_GET_SIZE(h1), + (duk_size_t) DUK_HBUFFER_GET_SIZE(h2)); +} +#endif + +#if defined(DUK_USE_FASTINT) +DUK_LOCAL duk_bool_t duk__compare_fastint(duk_bool_t retval, duk_int64_t v1, duk_int64_t v2) { + DUK_ASSERT(retval == 0 || retval == 1); + if (v1 < v2) { + return retval ^ 1; + } else { + return retval; + } +} +#endif + +#if defined(DUK_USE_PARANOID_MATH) +DUK_LOCAL duk_bool_t duk__compare_number(duk_bool_t retval, duk_double_t d1, duk_double_t d2) { + duk_small_int_t c1, s1, c2, s2; + + DUK_ASSERT(retval == 0 || retval == 1); + c1 = (duk_small_int_t) DUK_FPCLASSIFY(d1); + s1 = (duk_small_int_t) DUK_SIGNBIT(d1); + c2 = (duk_small_int_t) DUK_FPCLASSIFY(d2); + s2 = (duk_small_int_t) DUK_SIGNBIT(d2); + + if (c1 == DUK_FP_NAN || c2 == DUK_FP_NAN) { + return 0; /* Always false, regardless of negation. */ + } + + if (c1 == DUK_FP_ZERO && c2 == DUK_FP_ZERO) { + /* For all combinations: +0 < +0, +0 < -0, -0 < +0, -0 < -0, + * steps e, f, and g. + */ + return retval; /* false */ + } + + if (d1 == d2) { + return retval; /* false */ + } + + if (c1 == DUK_FP_INFINITE && s1 == 0) { + /* x == +Infinity */ + return retval; /* false */ + } + + if (c2 == DUK_FP_INFINITE && s2 == 0) { + /* y == +Infinity */ + return retval ^ 1; /* true */ + } + + if (c2 == DUK_FP_INFINITE && s2 != 0) { + /* y == -Infinity */ + return retval; /* false */ + } + + if (c1 == DUK_FP_INFINITE && s1 != 0) { + /* x == -Infinity */ + return retval ^ 1; /* true */ + } + + if (d1 < d2) { + return retval ^ 1; /* true */ + } + + return retval; /* false */ +} +#else /* DUK_USE_PARANOID_MATH */ +DUK_LOCAL duk_bool_t duk__compare_number(duk_bool_t retval, duk_double_t d1, duk_double_t d2) { + /* This comparison tree relies doesn't match the exact steps in + * E5 Section 11.8.5 but should produce the same results. The + * steps rely on exact IEEE semantics for NaNs, etc. + */ + + DUK_ASSERT(retval == 0 || retval == 1); + if (d1 < d2) { + /* In no case should both (d1 < d2) and (d2 < d1) be true. + * It's possible that neither is true though, and that's + * handled below. + */ + DUK_ASSERT(!(d2 < d1)); + + /* - d1 < d2, both d1/d2 are normals (not Infinity, not NaN) + * - d2 is +Infinity, d1 != +Infinity and NaN + * - d1 is -Infinity, d2 != -Infinity and NaN + */ + return retval ^ 1; + } else { + if (d2 < d1) { + /* - !(d1 < d2), both d1/d2 are normals (not Infinity, not NaN) + * - d1 is +Infinity, d2 != +Infinity and NaN + * - d2 is -Infinity, d1 != -Infinity and NaN + */ + return retval; + } else { + /* - d1 and/or d2 is NaN + * - d1 and d2 are both +/- 0 + * - d1 == d2 (including infinities) + */ + if (duk_double_is_nan(d1) || duk_double_is_nan(d2)) { + /* Note: undefined from Section 11.8.5 always + * results in false return (see e.g. Section + * 11.8.3) - hence special treatment here. + */ + return 0; /* zero regardless of negation */ + } else { + return retval; + } + } + } +} +#endif /* DUK_USE_PARANOID_MATH */ + +DUK_INTERNAL duk_bool_t duk_js_compare_helper(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_t flags) { + duk_double_t d1, d2; + duk_small_int_t rc; + duk_bool_t retval; + + DUK_ASSERT(DUK_COMPARE_FLAG_NEGATE == 1); /* Rely on this flag being lowest. */ + retval = flags & DUK_COMPARE_FLAG_NEGATE; + DUK_ASSERT(retval == 0 || retval == 1); + + /* Fast path for fastints */ +#if defined(DUK_USE_FASTINT) + if (DUK_LIKELY(DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y))) { + return duk__compare_fastint(retval, + DUK_TVAL_GET_FASTINT(tv_x), + DUK_TVAL_GET_FASTINT(tv_y)); + } +#endif /* DUK_USE_FASTINT */ + + /* Fast path for numbers (one of which may be a fastint) */ +#if !defined(DUK_USE_PREFER_SIZE) + if (DUK_LIKELY(DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y))) { + return duk__compare_number(retval, + DUK_TVAL_GET_NUMBER(tv_x), + DUK_TVAL_GET_NUMBER(tv_y)); + } +#endif + + /* Slow path */ + + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + + if (flags & DUK_COMPARE_FLAG_EVAL_LEFT_FIRST) { + duk_to_primitive(thr, -2, DUK_HINT_NUMBER); + duk_to_primitive(thr, -1, DUK_HINT_NUMBER); + } else { + duk_to_primitive(thr, -1, DUK_HINT_NUMBER); + duk_to_primitive(thr, -2, DUK_HINT_NUMBER); + } + + /* Note: reuse variables */ + tv_x = DUK_GET_TVAL_NEGIDX(thr, -2); + tv_y = DUK_GET_TVAL_NEGIDX(thr, -1); + + if (DUK_TVAL_IS_STRING(tv_x) && DUK_TVAL_IS_STRING(tv_y)) { + duk_hstring *h1 = DUK_TVAL_GET_STRING(tv_x); + duk_hstring *h2 = DUK_TVAL_GET_STRING(tv_y); + DUK_ASSERT(h1 != NULL); + DUK_ASSERT(h2 != NULL); + + if (DUK_LIKELY(!DUK_HSTRING_HAS_SYMBOL(h1) && !DUK_HSTRING_HAS_SYMBOL(h2))) { + rc = duk_js_string_compare(h1, h2); + duk_pop_2_unsafe(thr); + if (rc < 0) { + return retval ^ 1; + } else { + return retval; + } + } + + /* One or both are Symbols: fall through to handle in the + * generic path. Concretely, ToNumber() will fail. + */ + } + + /* Ordering should not matter (E5 Section 11.8.5, step 3.a). */ +#if 0 + if (flags & DUK_COMPARE_FLAG_EVAL_LEFT_FIRST) { + d1 = duk_to_number_m2(thr); + d2 = duk_to_number_m1(thr); + } else { + d2 = duk_to_number_m1(thr); + d1 = duk_to_number_m2(thr); + } +#endif + d1 = duk_to_number_m2(thr); + d2 = duk_to_number_m1(thr); + + /* We want to duk_pop_2_unsafe(thr); because the values are numbers + * no decref check is needed. + */ +#if defined(DUK_USE_PREFER_SIZE) + duk_pop_2_nodecref_unsafe(thr); +#else + DUK_ASSERT(!DUK_TVAL_NEEDS_REFCOUNT_UPDATE(duk_get_tval(thr, -2))); + DUK_ASSERT(!DUK_TVAL_NEEDS_REFCOUNT_UPDATE(duk_get_tval(thr, -1))); + DUK_ASSERT(duk_get_top(thr) >= 2); + thr->valstack_top -= 2; + tv_x = thr->valstack_top; + tv_y = tv_x + 1; + DUK_TVAL_SET_UNDEFINED(tv_x); /* Value stack policy */ + DUK_TVAL_SET_UNDEFINED(tv_y); +#endif + + return duk__compare_number(retval, d1, d2); +} + +/* + * instanceof + */ + +/* + * ES2015 Section 7.3.19 describes the OrdinaryHasInstance() algorithm + * which covers both bound and non-bound functions; in effect the algorithm + * includes E5 Sections 11.8.6, 15.3.5.3, and 15.3.4.5.3. + * + * ES2015 Section 12.9.4 describes the instanceof operator which first + * checks @@hasInstance well-known symbol and falls back to + * OrdinaryHasInstance(). + * + * Limited Proxy support: don't support 'getPrototypeOf' trap but + * continue lookup in Proxy target if the value is a Proxy. + */ + +DUK_LOCAL duk_bool_t duk__js_instanceof_helper(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_bool_t skip_sym_check) { + duk_hobject *func; + duk_hobject *val; + duk_hobject *proto; + duk_tval *tv; + duk_bool_t skip_first; + duk_uint_t sanity; + + /* + * Get the values onto the stack first. It would be possible to cover + * some normal cases without resorting to the value stack. + * + * The right hand side could be a light function (as they generally + * behave like objects). Light functions never have a 'prototype' + * property so E5.1 Section 15.3.5.3 step 3 always throws a TypeError. + * Using duk_require_hobject() is thus correct (except for error msg). + */ + + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + func = duk_require_hobject(thr, -1); + DUK_ASSERT(func != NULL); + +#if defined(DUK_USE_SYMBOL_BUILTIN) + /* + * @@hasInstance check, ES2015 Section 12.9.4, Steps 2-4. + */ + if (!skip_sym_check) { + if (duk_get_method_stridx(thr, -1, DUK_STRIDX_WELLKNOWN_SYMBOL_HAS_INSTANCE)) { + /* [ ... lhs rhs func ] */ + duk_insert(thr, -3); /* -> [ ... func lhs rhs ] */ + duk_swap_top(thr, -2); /* -> [ ... func rhs(this) lhs ] */ + duk_call_method(thr, 1); + return duk_to_boolean_top_pop(thr); + } + } +#else + DUK_UNREF(skip_sym_check); +#endif + + /* + * For bound objects, [[HasInstance]] just calls the target function + * [[HasInstance]]. If that is again a bound object, repeat until + * we find a non-bound Function object. + * + * The bound function chain is now "collapsed" so there can be only + * one bound function in the chain. + */ + + if (!DUK_HOBJECT_IS_CALLABLE(func)) { + /* + * Note: of native ECMAScript objects, only Function instances + * have a [[HasInstance]] internal property. Custom objects might + * also have it, but not in current implementation. + * + * XXX: add a separate flag, DUK_HOBJECT_FLAG_ALLOW_INSTANCEOF? + */ + goto error_invalid_rval; + } + + if (DUK_HOBJECT_HAS_BOUNDFUNC(func)) { + duk_push_tval(thr, &((duk_hboundfunc *) (void *) func)->target); + duk_replace(thr, -2); + func = duk_require_hobject(thr, -1); /* lightfunc throws */ + + /* Rely on Function.prototype.bind() never creating bound + * functions whose target is not proper. + */ + DUK_ASSERT(func != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_CALLABLE(func)); + } + + /* + * 'func' is now a non-bound object which supports [[HasInstance]] + * (which here just means DUK_HOBJECT_FLAG_CALLABLE). Move on + * to execute E5 Section 15.3.5.3. + */ + + DUK_ASSERT(func != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(func)); + DUK_ASSERT(DUK_HOBJECT_IS_CALLABLE(func)); + + /* [ ... lval rval(func) ] */ + + /* For lightfuncs, buffers, and pointers start the comparison directly + * from the virtual prototype object. + */ + skip_first = 0; + tv = DUK_GET_TVAL_NEGIDX(thr, -2); + switch (DUK_TVAL_GET_TAG(tv)) { + case DUK_TAG_LIGHTFUNC: + val = thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]; + DUK_ASSERT(val != NULL); + break; + case DUK_TAG_BUFFER: + val = thr->builtins[DUK_BIDX_UINT8ARRAY_PROTOTYPE]; + DUK_ASSERT(val != NULL); + break; + case DUK_TAG_POINTER: + val = thr->builtins[DUK_BIDX_POINTER_PROTOTYPE]; + DUK_ASSERT(val != NULL); + break; + case DUK_TAG_OBJECT: + skip_first = 1; /* Ignore object itself on first round. */ + val = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(val != NULL); + break; + default: + goto pop2_and_false; + } + DUK_ASSERT(val != NULL); /* Loop doesn't actually rely on this. */ + + /* Look up .prototype of rval. Leave it on the value stack in case it + * has been virtualized (e.g. getter, Proxy trap). + */ + duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_PROTOTYPE); /* -> [ ... lval rval rval.prototype ] */ +#if defined(DUK_USE_VERBOSE_ERRORS) + proto = duk_get_hobject(thr, -1); + if (proto == NULL) { + goto error_invalid_rval_noproto; + } +#else + proto = duk_require_hobject(thr, -1); +#endif + + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + do { + /* + * Note: prototype chain is followed BEFORE first comparison. This + * means that the instanceof lval is never itself compared to the + * rval.prototype property. This is apparently intentional, see E5 + * Section 15.3.5.3, step 4.a. + * + * Also note: + * + * js> (function() {}) instanceof Function + * true + * js> Function instanceof Function + * true + * + * For the latter, h_proto will be Function.prototype, which is the + * built-in Function prototype. Because Function.[[Prototype]] is + * also the built-in Function prototype, the result is true. + */ + + if (!val) { + goto pop3_and_false; + } + + DUK_ASSERT(val != NULL); +#if defined(DUK_USE_ES6_PROXY) + val = duk_hobject_resolve_proxy_target(val); +#endif + + if (skip_first) { + skip_first = 0; + } else if (val == proto) { + goto pop3_and_true; + } + + DUK_ASSERT(val != NULL); + val = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, val); + } while (--sanity > 0); + + if (DUK_UNLIKELY(sanity == 0)) { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + DUK_UNREACHABLE(); + + pop2_and_false: + duk_pop_2_unsafe(thr); + return 0; + + pop3_and_false: + duk_pop_3_unsafe(thr); + return 0; + + pop3_and_true: + duk_pop_3_unsafe(thr); + return 1; + + error_invalid_rval: + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_INSTANCEOF_RVAL); + DUK_WO_NORETURN(return 0;); + +#if defined(DUK_USE_VERBOSE_ERRORS) + error_invalid_rval_noproto: + DUK_ERROR_TYPE(thr, DUK_STR_INVALID_INSTANCEOF_RVAL_NOPROTO); + DUK_WO_NORETURN(return 0;); +#endif +} + +#if defined(DUK_USE_SYMBOL_BUILTIN) +DUK_INTERNAL duk_bool_t duk_js_instanceof_ordinary(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y) { + return duk__js_instanceof_helper(thr, tv_x, tv_y, 1 /*skip_sym_check*/); +} +#endif + +DUK_INTERNAL duk_bool_t duk_js_instanceof(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y) { + return duk__js_instanceof_helper(thr, tv_x, tv_y, 0 /*skip_sym_check*/); +} + +/* + * in + */ + +/* + * E5 Sections 11.8.7, 8.12.6. + * + * Basically just a property existence check using [[HasProperty]]. + */ + +DUK_INTERNAL duk_bool_t duk_js_in(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y) { + duk_bool_t retval; + + /* + * Get the values onto the stack first. It would be possible to cover + * some normal cases without resorting to the value stack (e.g. if + * lval is already a string). + */ + + /* XXX: The ES5/5.1/6 specifications require that the key in 'key in obj' + * must be string coerced before the internal HasProperty() algorithm is + * invoked. A fast path skipping coercion could be safely implemented for + * numbers (as number-to-string coercion has no side effects). For ES2015 + * proxy behavior, the trap 'key' argument must be in a string coerced + * form (which is a shame). + */ + + /* TypeError if rval is not an object or object like (e.g. lightfunc + * or plain buffer). + */ + duk_push_tval(thr, tv_x); + duk_push_tval(thr, tv_y); + duk_require_type_mask(thr, -1, DUK_TYPE_MASK_OBJECT | DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER); + + (void) duk_to_property_key_hstring(thr, -2); + + retval = duk_hobject_hasprop(thr, + DUK_GET_TVAL_NEGIDX(thr, -1), + DUK_GET_TVAL_NEGIDX(thr, -2)); + + duk_pop_2_unsafe(thr); + return retval; +} + +/* + * typeof + * + * E5 Section 11.4.3. + * + * Very straightforward. The only question is what to return for our + * non-standard tag / object types. + * + * There is an unfortunate string constant define naming problem with + * typeof return values for e.g. "Object" and "object"; careful with + * the built-in string defines. The LC_XXX defines are used for the + * lowercase variants now. + */ + +DUK_INTERNAL duk_small_uint_t duk_js_typeof_stridx(duk_tval *tv_x) { + duk_small_uint_t stridx = 0; + + switch (DUK_TVAL_GET_TAG(tv_x)) { + case DUK_TAG_UNDEFINED: { + stridx = DUK_STRIDX_LC_UNDEFINED; + break; + } + case DUK_TAG_NULL: { + /* Note: not a typo, "object" is returned for a null value. */ + stridx = DUK_STRIDX_LC_OBJECT; + break; + } + case DUK_TAG_BOOLEAN: { + stridx = DUK_STRIDX_LC_BOOLEAN; + break; + } + case DUK_TAG_POINTER: { + /* Implementation specific. */ + stridx = DUK_STRIDX_LC_POINTER; + break; + } + case DUK_TAG_STRING: { + duk_hstring *str; + + /* All internal keys are identified as Symbols. */ + str = DUK_TVAL_GET_STRING(tv_x); + DUK_ASSERT(str != NULL); + if (DUK_UNLIKELY(DUK_HSTRING_HAS_SYMBOL(str))) { + stridx = DUK_STRIDX_LC_SYMBOL; + } else { + stridx = DUK_STRIDX_LC_STRING; + } + break; + } + case DUK_TAG_OBJECT: { + duk_hobject *obj = DUK_TVAL_GET_OBJECT(tv_x); + DUK_ASSERT(obj != NULL); + if (DUK_HOBJECT_IS_CALLABLE(obj)) { + stridx = DUK_STRIDX_LC_FUNCTION; + } else { + stridx = DUK_STRIDX_LC_OBJECT; + } + break; + } + case DUK_TAG_BUFFER: { + /* Implementation specific. In Duktape 1.x this would be + * 'buffer', in Duktape 2.x changed to 'object' because plain + * buffers now mimic Uint8Array objects. + */ + stridx = DUK_STRIDX_LC_OBJECT; + break; + } + case DUK_TAG_LIGHTFUNC: { + stridx = DUK_STRIDX_LC_FUNCTION; + break; + } +#if defined(DUK_USE_FASTINT) + case DUK_TAG_FASTINT: +#endif + default: { + /* number */ + DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv_x)); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_x)); + stridx = DUK_STRIDX_LC_NUMBER; + break; + } + } + + DUK_ASSERT_STRIDX_VALID(stridx); + return stridx; +} + +/* + * Array index and length + * + * Array index: E5 Section 15.4 + * Array length: E5 Section 15.4.5.1 steps 3.c - 3.d (array length write) + */ + +/* Compure array index from string context, or return a "not array index" + * indicator. + */ +DUK_INTERNAL duk_uarridx_t duk_js_to_arrayindex_string(const duk_uint8_t *str, duk_uint32_t blen) { + duk_uarridx_t res; + + /* Only strings with byte length 1-10 can be 32-bit array indices. + * Leading zeroes (except '0' alone), plus/minus signs are not allowed. + * We could do a lot of prechecks here, but since most strings won't + * start with any digits, it's simpler to just parse the number and + * fail quickly. + */ + + res = 0; + if (blen == 0) { + goto parse_fail; + } + do { + duk_uarridx_t dig; + dig = (duk_uarridx_t) (*str++) - DUK_ASC_0; + + if (dig <= 9U) { + /* Careful overflow handling. When multiplying by 10: + * - 0x19999998 x 10 = 0xfffffff0: no overflow, and adding + * 0...9 is safe. + * - 0x19999999 x 10 = 0xfffffffa: no overflow, adding + * 0...5 is safe, 6...9 overflows. + * - 0x1999999a x 10 = 0x100000004: always overflow. + */ + if (DUK_UNLIKELY(res >= 0x19999999UL)) { + if (res >= 0x1999999aUL) { + /* Always overflow. */ + goto parse_fail; + } + DUK_ASSERT(res == 0x19999999UL); + if (dig >= 6U) { + goto parse_fail; + } + res = 0xfffffffaUL + dig; + DUK_ASSERT(res >= 0xfffffffaUL); + DUK_ASSERT_DISABLE(res <= 0xffffffffUL); /* range */ + } else { + res = res * 10U + dig; + if (DUK_UNLIKELY(res == 0)) { + /* If 'res' is 0, previous 'res' must + * have been 0 and we scanned in a zero. + * This is only allowed if blen == 1, + * i.e. the exact string '0'. + */ + if (blen == (duk_uint32_t) 1) { + return 0; + } + goto parse_fail; + } + } + } else { + /* Because 'dig' is unsigned, catches both values + * above '9' and below '0'. + */ + goto parse_fail; + } + } while (--blen > 0); + + return res; + + parse_fail: + return DUK_HSTRING_NO_ARRAY_INDEX; +} + +#if !defined(DUK_USE_HSTRING_ARRIDX) +/* Get array index for a string which is known to be an array index. This helper + * is needed when duk_hstring doesn't concretely store the array index, but strings + * are flagged as array indices at intern time. + */ +DUK_INTERNAL duk_uarridx_t duk_js_to_arrayindex_hstring_fast_known(duk_hstring *h) { + const duk_uint8_t *p; + duk_uarridx_t res; + duk_uint8_t t; + + DUK_ASSERT(h != NULL); + DUK_ASSERT(DUK_HSTRING_HAS_ARRIDX(h)); + + p = DUK_HSTRING_GET_DATA(h); + res = 0; + for (;;) { + t = *p++; + if (DUK_UNLIKELY(t == 0)) { + /* Scanning to NUL is always safe for interned strings. */ + break; + } + DUK_ASSERT(t >= (duk_uint8_t) DUK_ASC_0 && t <= (duk_uint8_t) DUK_ASC_9); + res = res * 10U + (duk_uarridx_t) t - (duk_uarridx_t) DUK_ASC_0; + } + return res; +} + +DUK_INTERNAL duk_uarridx_t duk_js_to_arrayindex_hstring_fast(duk_hstring *h) { + DUK_ASSERT(h != NULL); + if (!DUK_HSTRING_HAS_ARRIDX(h)) { + return DUK_HSTRING_NO_ARRAY_INDEX; + } + return duk_js_to_arrayindex_hstring_fast_known(h); +} +#endif /* DUK_USE_HSTRING_ARRIDX */ +#line 1 "duk_js_var.c" +/* + * Identifier access and function closure handling. + * + * Provides the primitives for slow path identifier accesses: GETVAR, + * PUTVAR, DELVAR, etc. The fast path, direct register accesses, should + * be used for most identifier accesses. Consequently, these slow path + * primitives should be optimized for maximum compactness. + * + * ECMAScript environment records (declarative and object) are represented + * as internal objects with control keys. Environment records have a + * parent record ("outer environment reference") which is represented by + * the implicit prototype for technical reasons (in other words, it is a + * convenient field). The prototype chain is not followed in the ordinary + * sense for variable lookups. + * + * See identifier-handling.rst for more details on the identifier algorithms + * and the internal representation. See function-objects.rst for details on + * what function templates and instances are expected to look like. + * + * Care must be taken to avoid duk_tval pointer invalidation caused by + * e.g. value stack or object resizing. + * + * TODO: properties for function instances could be initialized much more + * efficiently by creating a property allocation for a certain size and + * filling in keys and values directly (and INCREFing both with "bulk incref" + * primitives. + * + * XXX: duk_hobject_getprop() and duk_hobject_putprop() calls are a bit + * awkward (especially because they follow the prototype chain); rework + * if "raw" own property helpers are added. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Local result type for duk__get_identifier_reference() lookup. + */ + +typedef struct { + duk_hobject *env; + duk_hobject *holder; /* for object-bound identifiers */ + duk_tval *value; /* for register-bound and declarative env identifiers */ + duk_uint_t attrs; /* property attributes for identifier (relevant if value != NULL) */ + duk_bool_t has_this; /* for object-bound identifiers: provide 'this' binding */ +} duk__id_lookup_result; + +/* + * Create a new function object based on a "template function" which contains + * compiled bytecode, constants, etc, but lacks a lexical environment. + * + * ECMAScript requires that each created closure is a separate object, with + * its own set of editable properties. However, structured property values + * (such as the formal arguments list and the variable map) are shared. + * Also the bytecode, constants, and inner functions are shared. + * + * See E5 Section 13.2 for detailed requirements on the function objects; + * there are no similar requirements for function "templates" which are an + * implementation dependent internal feature. Also see function-objects.rst + * for a discussion on the function instance properties provided by this + * implementation. + * + * Notes: + * + * * Order of internal properties should match frequency of use, since the + * properties will be linearly scanned on lookup (functions usually don't + * have enough properties to warrant a hash part). + * + * * The created closure is independent of its template; they do share the + * same 'data' buffer object, but the template object itself can be freed + * even if the closure object remains reachable. + */ + +DUK_LOCAL void duk__inc_data_inner_refcounts(duk_hthread *thr, duk_hcompfunc *f) { + duk_tval *tv, *tv_end; + duk_hobject **funcs, **funcs_end; + + DUK_UNREF(thr); + + /* If function creation fails due to out-of-memory, the data buffer + * pointer may be NULL in some cases. That's actually possible for + * GC code, but shouldn't be possible here because the incomplete + * function will be unwound from the value stack and never instantiated. + */ + DUK_ASSERT(DUK_HCOMPFUNC_GET_DATA(thr->heap, f) != NULL); + + tv = DUK_HCOMPFUNC_GET_CONSTS_BASE(thr->heap, f); + tv_end = DUK_HCOMPFUNC_GET_CONSTS_END(thr->heap, f); + while (tv < tv_end) { + DUK_TVAL_INCREF(thr, tv); + tv++; + } + + funcs = DUK_HCOMPFUNC_GET_FUNCS_BASE(thr->heap, f); + funcs_end = DUK_HCOMPFUNC_GET_FUNCS_END(thr->heap, f); + while (funcs < funcs_end) { + DUK_HEAPHDR_INCREF(thr, (duk_heaphdr *) *funcs); + funcs++; + } +} + +/* Push a new closure on the stack. + * + * Note: if fun_temp has NEWENV, i.e. a new lexical and variable declaration + * is created when the function is called, only outer_lex_env matters + * (outer_var_env is ignored and may or may not be same as outer_lex_env). + */ + +DUK_LOCAL const duk_uint16_t duk__closure_copy_proplist[] = { + /* order: most frequent to least frequent */ + DUK_STRIDX_INT_VARMAP, + DUK_STRIDX_INT_FORMALS, +#if defined(DUK_USE_PC2LINE) + DUK_STRIDX_INT_PC2LINE, +#endif +#if defined(DUK_USE_FUNC_FILENAME_PROPERTY) + DUK_STRIDX_FILE_NAME, +#endif +#if defined(DUK_USE_NONSTD_FUNC_SOURCE_PROPERTY) + DUK_STRIDX_INT_SOURCE +#endif +}; + +DUK_INTERNAL +void duk_js_push_closure(duk_hthread *thr, + duk_hcompfunc *fun_temp, + duk_hobject *outer_var_env, + duk_hobject *outer_lex_env, + duk_bool_t add_auto_proto) { + duk_hcompfunc *fun_clos; + duk_small_uint_t i; + duk_uint_t len_value; + + DUK_ASSERT(fun_temp != NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_DATA(thr->heap, fun_temp) != NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_FUNCS(thr->heap, fun_temp) != NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_BYTECODE(thr->heap, fun_temp) != NULL); + DUK_ASSERT(outer_var_env != NULL); + DUK_ASSERT(outer_lex_env != NULL); + DUK_UNREF(len_value); + + fun_clos = duk_push_hcompfunc(thr); + DUK_ASSERT(fun_clos != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) fun_clos) == thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); + + duk_push_hobject(thr, &fun_temp->obj); /* -> [ ... closure template ] */ + + DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun_clos)); + DUK_ASSERT(DUK_HCOMPFUNC_GET_DATA(thr->heap, fun_clos) == NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_FUNCS(thr->heap, fun_clos) == NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_BYTECODE(thr->heap, fun_clos) == NULL); + + DUK_HCOMPFUNC_SET_DATA(thr->heap, fun_clos, DUK_HCOMPFUNC_GET_DATA(thr->heap, fun_temp)); + DUK_HCOMPFUNC_SET_FUNCS(thr->heap, fun_clos, DUK_HCOMPFUNC_GET_FUNCS(thr->heap, fun_temp)); + DUK_HCOMPFUNC_SET_BYTECODE(thr->heap, fun_clos, DUK_HCOMPFUNC_GET_BYTECODE(thr->heap, fun_temp)); + + /* Note: all references inside 'data' need to get their refcounts + * upped too. This is the case because refcounts are decreased + * through every function referencing 'data' independently. + */ + + DUK_HBUFFER_INCREF(thr, DUK_HCOMPFUNC_GET_DATA(thr->heap, fun_clos)); + duk__inc_data_inner_refcounts(thr, fun_temp); + + fun_clos->nregs = fun_temp->nregs; + fun_clos->nargs = fun_temp->nargs; +#if defined(DUK_USE_DEBUGGER_SUPPORT) + fun_clos->start_line = fun_temp->start_line; + fun_clos->end_line = fun_temp->end_line; +#endif + + DUK_ASSERT(DUK_HCOMPFUNC_GET_DATA(thr->heap, fun_clos) != NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_FUNCS(thr->heap, fun_clos) != NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_BYTECODE(thr->heap, fun_clos) != NULL); + + /* XXX: Could also copy from template, but there's no way to have any + * other value here now (used code has no access to the template). + * Prototype is set by duk_push_hcompfunc(). + */ + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, &fun_clos->obj) == thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); +#if 0 + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, &fun_clos->obj, thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); +#endif + + /* Copy duk_hobject flags as is from the template using a mask. + * Leave out duk_heaphdr owned flags just in case (e.g. if there's + * some GC flag or similar). Some flags can then be adjusted + * separately if necessary. + */ + + /* DUK_HEAPHDR_SET_FLAGS() masks changes to non-duk_heaphdr flags only. */ + DUK_HEAPHDR_SET_FLAGS((duk_heaphdr *) fun_clos, DUK_HEAPHDR_GET_FLAGS_RAW((duk_heaphdr *) fun_temp)); + DUK_DD(DUK_DDPRINT("fun_temp heaphdr flags: 0x%08lx, fun_clos heaphdr flags: 0x%08lx", + (unsigned long) DUK_HEAPHDR_GET_FLAGS_RAW((duk_heaphdr *) fun_temp), + (unsigned long) DUK_HEAPHDR_GET_FLAGS_RAW((duk_heaphdr *) fun_clos))); + + DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(&fun_clos->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(&fun_clos->obj)); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPFUNC(&fun_clos->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_NATFUNC(&fun_clos->obj)); + DUK_ASSERT(!DUK_HOBJECT_IS_THREAD(&fun_clos->obj)); + /* DUK_HOBJECT_FLAG_ARRAY_PART: don't care */ + /* DUK_HOBJECT_FLAG_NEWENV: handled below */ + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARRAY(&fun_clos->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_STRINGOBJ(&fun_clos->obj)); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(&fun_clos->obj)); + + if (!DUK_HOBJECT_HAS_CONSTRUCTABLE(&fun_clos->obj)) { + /* If the template is not constructable don't add an automatic + * .prototype property. This is the case for e.g. ES2015 object + * literal getters/setters and method definitions. + */ + add_auto_proto = 0; + } + + /* + * Setup environment record properties based on the template and + * its flags. + * + * If DUK_HOBJECT_HAS_NEWENV(fun_temp) is true, the environment + * records represent identifiers "outside" the function; the + * "inner" environment records are created on demand. Otherwise, + * the environment records are those that will be directly used + * (e.g. for declarations). + * + * _Lexenv is always set; _Varenv defaults to _Lexenv if missing, + * so _Varenv is only set if _Lexenv != _Varenv. + * + * This is relatively complex, see doc/identifier-handling.rst. + */ + + if (DUK_HOBJECT_HAS_NEWENV(&fun_clos->obj)) { +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + if (DUK_HOBJECT_HAS_NAMEBINDING(&fun_clos->obj)) { + duk_hobject *proto; + duk_hdecenv *new_env; + + /* + * Named function expression, name needs to be bound + * in an intermediate environment record. The "outer" + * lexical/variable environment will thus be: + * + * a) { funcname: <func>, __prototype: outer_lex_env } + * b) { funcname: <func>, __prototype: <globalenv> } (if outer_lex_env missing) + */ + + if (outer_lex_env) { + proto = outer_lex_env; + } else { + proto = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + } + + /* -> [ ... closure template env ] */ + new_env = duk_hdecenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV)); + DUK_ASSERT(new_env != NULL); + duk_push_hobject(thr, (duk_hobject *) new_env); + + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) new_env) == NULL); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *) new_env, proto); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, proto); + + DUK_ASSERT(new_env->thread == NULL); /* Closed. */ + DUK_ASSERT(new_env->varmap == NULL); + + /* It's important that duk_xdef_prop() is a 'raw define' so that any + * properties in an ancestor are never an issue (they should never be + * e.g. non-writable, but just in case). + * + * Because template objects are not visible to user code, the case + * where .name is missing shouldn't happen in practice. It it does, + * the name 'undefined' gets bound and maps to the closure (which is + * a bit odd, but safe). + */ + (void) duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_NAME); + /* -> [ ... closure template env funcname ] */ + duk_dup_m4(thr); /* -> [ ... closure template env funcname closure ] */ + duk_xdef_prop(thr, -3, DUK_PROPDESC_FLAGS_NONE); /* -> [ ... closure template env ] */ + /* env[funcname] = closure */ + + /* [ ... closure template env ] */ + + DUK_HCOMPFUNC_SET_LEXENV(thr->heap, fun_clos, (duk_hobject *) new_env); + DUK_HCOMPFUNC_SET_VARENV(thr->heap, fun_clos, (duk_hobject *) new_env); + DUK_HOBJECT_INCREF(thr, (duk_hobject *) new_env); + DUK_HOBJECT_INCREF(thr, (duk_hobject *) new_env); + duk_pop_unsafe(thr); + + /* [ ... closure template ] */ + } + else +#endif /* DUK_USE_FUNC_NAME_PROPERTY */ + { + /* + * Other cases (function declaration, anonymous function expression, + * strict direct eval code). The "outer" environment will be whatever + * the caller gave us. + */ + + DUK_HCOMPFUNC_SET_LEXENV(thr->heap, fun_clos, outer_lex_env); + DUK_HCOMPFUNC_SET_VARENV(thr->heap, fun_clos, outer_lex_env); + DUK_HOBJECT_INCREF(thr, outer_lex_env); + DUK_HOBJECT_INCREF(thr, outer_lex_env); + + /* [ ... closure template ] */ + } + } else { + /* + * Function gets no new environment when called. This is the + * case for global code, indirect eval code, and non-strict + * direct eval code. There is no direct correspondence to the + * E5 specification, as global/eval code is not exposed as a + * function. + */ + + DUK_ASSERT(!DUK_HOBJECT_HAS_NAMEBINDING(&fun_temp->obj)); + + DUK_HCOMPFUNC_SET_LEXENV(thr->heap, fun_clos, outer_lex_env); + DUK_HCOMPFUNC_SET_VARENV(thr->heap, fun_clos, outer_var_env); + DUK_HOBJECT_INCREF(thr, outer_lex_env); /* NULLs not allowed; asserted on entry */ + DUK_HOBJECT_INCREF(thr, outer_var_env); + } + DUK_DDD(DUK_DDDPRINT("closure varenv -> %!ipO, lexenv -> %!ipO", + (duk_heaphdr *) fun_clos->var_env, + (duk_heaphdr *) fun_clos->lex_env)); + + /* Call handling assumes this for all callable closures. */ + DUK_ASSERT(DUK_HCOMPFUNC_GET_LEXENV(thr->heap, fun_clos) != NULL); + DUK_ASSERT(DUK_HCOMPFUNC_GET_VARENV(thr->heap, fun_clos) != NULL); + + /* + * Copy some internal properties directly + * + * The properties will be non-writable and non-enumerable, but + * configurable. + */ + + /* [ ... closure template ] */ + + DUK_DDD(DUK_DDDPRINT("copying properties: closure=%!iT, template=%!iT", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + + for (i = 0; i < (duk_small_uint_t) (sizeof(duk__closure_copy_proplist) / sizeof(duk_uint16_t)); i++) { + duk_small_int_t stridx = (duk_small_int_t) duk__closure_copy_proplist[i]; + if (duk_get_prop_stridx_short(thr, -1, stridx)) { + /* [ ... closure template val ] */ + DUK_DDD(DUK_DDDPRINT("copying property, stridx=%ld -> found", (long) stridx)); + duk_xdef_prop_stridx_short(thr, -3, stridx, DUK_PROPDESC_FLAGS_C); + } else { + DUK_DDD(DUK_DDDPRINT("copying property, stridx=%ld -> not found", (long) stridx)); + duk_pop_unsafe(thr); + } + } + + /* + * "length" maps to number of formals (E5 Section 13.2) for function + * declarations/expressions (non-bound functions). Note that 'nargs' + * is NOT necessarily equal to the number of arguments. Use length + * of _Formals; if missing, assume nargs matches .length. + */ + + /* [ ... closure template ] */ + + /* XXX: these lookups should be just own property lookups instead of + * looking up the inheritance chain. + */ + if (duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_INT_FORMALS)) { + /* [ ... closure template formals ] */ + len_value = (duk_uint_t) duk_get_length(thr, -1); /* could access duk_harray directly, not important */ + DUK_DD(DUK_DDPRINT("closure length from _Formals -> %ld", (long) len_value)); + } else { + len_value = fun_temp->nargs; + DUK_DD(DUK_DDPRINT("closure length defaulted from nargs -> %ld", (long) len_value)); + } + duk_pop_unsafe(thr); + + duk_push_uint(thr, len_value); /* [ ... closure template len_value ] */ + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_C); + + /* + * "prototype" is, by default, a fresh object with the "constructor" + * property. + * + * Note that this creates a circular reference for every function + * instance (closure) which prevents refcount-based collection of + * function instances. + * + * XXX: Try to avoid creating the default prototype object, because + * many functions are not used as constructors and the default + * prototype is unnecessary. Perhaps it could be created on-demand + * when it is first accessed? + */ + + /* [ ... closure template ] */ + + if (add_auto_proto) { + duk_push_object(thr); /* -> [ ... closure template newobj ] */ + duk_dup_m3(thr); /* -> [ ... closure template newobj closure ] */ + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_CONSTRUCTOR, DUK_PROPDESC_FLAGS_WC); /* -> [ ... closure template newobj ] */ + duk_compact(thr, -1); /* compact the prototype */ + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_PROTOTYPE, DUK_PROPDESC_FLAGS_W); /* -> [ ... closure template ] */ + } + + /* + * "arguments" and "caller" must be mapped to throwers for strict + * mode and bound functions (E5 Section 15.3.5). + * + * XXX: This is expensive to have for every strict function instance. + * Try to implement as virtual properties or on-demand created properties. + */ + + /* [ ... closure template ] */ + + if (DUK_HOBJECT_HAS_STRICT(&fun_clos->obj)) { + duk_xdef_prop_stridx_thrower(thr, -2, DUK_STRIDX_CALLER); + duk_xdef_prop_stridx_thrower(thr, -2, DUK_STRIDX_LC_ARGUMENTS); + } else { +#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) + DUK_DDD(DUK_DDDPRINT("function is non-strict and non-standard 'caller' property in use, add initial 'null' value")); + duk_push_null(thr); + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_CALLER, DUK_PROPDESC_FLAGS_NONE); +#else + DUK_DDD(DUK_DDDPRINT("function is non-strict and non-standard 'caller' property not used")); +#endif + } + + /* + * "name" used to be non-standard but is now defined by ES2015. + * In ES2015/ES2016 the .name property is configurable. + */ + + /* [ ... closure template ] */ + +#if defined(DUK_USE_FUNC_NAME_PROPERTY) + /* XXX: Look for own property only; doesn't matter much because + * templates are bare objects. + */ + if (duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_NAME)) { + /* [ ... closure template name ] */ + DUK_ASSERT(duk_is_string(thr, -1)); + DUK_DD(DUK_DDPRINT("setting function instance name to %!T", duk_get_tval(thr, -1))); + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C); /* -> [ ... closure template ] */ + } else { + /* Anonymous functions don't have a .name in ES2015, so don't set + * it on the instance either. The instance will then inherit + * it from Function.prototype.name. + */ + DUK_DD(DUK_DDPRINT("not setting function instance .name")); + duk_pop_unsafe(thr); + } +#endif + + /* + * Compact the closure, in most cases no properties will be added later. + * Also, without this the closures end up having unused property slots + * (e.g. in Duktape 0.9.0, 8 slots would be allocated and only 7 used). + * A better future solution would be to allocate the closure directly + * to correct size (and setup the properties directly without going + * through the API). + */ + + duk_compact(thr, -2); + + /* + * Some assertions (E5 Section 13.2). + */ + + DUK_ASSERT(DUK_HOBJECT_GET_CLASS_NUMBER(&fun_clos->obj) == DUK_HOBJECT_CLASS_FUNCTION); + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, &fun_clos->obj) == thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]); + DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(&fun_clos->obj)); + DUK_ASSERT(duk_has_prop_stridx(thr, -2, DUK_STRIDX_LENGTH) != 0); + DUK_ASSERT(add_auto_proto == 0 || duk_has_prop_stridx(thr, -2, DUK_STRIDX_PROTOTYPE) != 0); + /* May be missing .name */ + DUK_ASSERT(!DUK_HOBJECT_HAS_STRICT(&fun_clos->obj) || + duk_has_prop_stridx(thr, -2, DUK_STRIDX_CALLER) != 0); + DUK_ASSERT(!DUK_HOBJECT_HAS_STRICT(&fun_clos->obj) || + duk_has_prop_stridx(thr, -2, DUK_STRIDX_LC_ARGUMENTS) != 0); + + /* + * Finish + */ + + /* [ ... closure template ] */ + + DUK_DDD(DUK_DDDPRINT("created function instance: template=%!iT -> closure=%!iT", + (duk_tval *) duk_get_tval(thr, -1), + (duk_tval *) duk_get_tval(thr, -2))); + + duk_pop_unsafe(thr); + + /* [ ... closure ] */ +} + +/* + * Delayed activation environment record initialization (for functions + * with NEWENV). + * + * The non-delayed initialization is handled by duk_handle_call(). + */ + +/* shared helper */ +DUK_INTERNAL +duk_hobject *duk_create_activation_environment_record(duk_hthread *thr, + duk_hobject *func, + duk_size_t bottom_byteoff) { + duk_hdecenv *env; + duk_hobject *parent; + duk_hcompfunc *f; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(func != NULL); + + f = (duk_hcompfunc *) func; + parent = DUK_HCOMPFUNC_GET_LEXENV(thr->heap, f); + if (!parent) { + parent = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + } + + env = duk_hdecenv_alloc(thr, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV)); + DUK_ASSERT(env != NULL); + duk_push_hobject(thr, (duk_hobject *) env); + + DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) env) == NULL); + DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *) env, parent); + DUK_HOBJECT_INCREF_ALLOWNULL(thr, parent); /* parent env is the prototype */ + + /* open scope information, for compiled functions only */ + + DUK_ASSERT(env->thread == NULL); + DUK_ASSERT(env->varmap == NULL); + DUK_ASSERT(env->regbase_byteoff == 0); + if (DUK_HOBJECT_IS_COMPFUNC(func)) { + duk_hobject *varmap; + duk_tval *tv; + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_INT_VARMAP(thr)); + if (tv != NULL && DUK_TVAL_IS_OBJECT(tv)) { + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); + varmap = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(varmap != NULL); + env->varmap = varmap; + DUK_HOBJECT_INCREF(thr, varmap); + env->thread = thr; + DUK_HTHREAD_INCREF(thr, thr); + env->regbase_byteoff = bottom_byteoff; + } else { + /* If function has no _Varmap, leave the environment closed. */ + DUK_ASSERT(env->thread == NULL); + DUK_ASSERT(env->varmap == NULL); + DUK_ASSERT(env->regbase_byteoff == 0); + } + } + + return (duk_hobject *) env; +} + +DUK_INTERNAL +void duk_js_init_activation_environment_records_delayed(duk_hthread *thr, + duk_activation *act) { + duk_hobject *func; + duk_hobject *env; + + DUK_ASSERT(thr != NULL); + func = DUK_ACT_GET_FUNC(act); + DUK_ASSERT(func != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(func)); /* bound functions are never in act 'func' */ + + /* + * Delayed initialization only occurs for 'NEWENV' functions. + */ + + DUK_ASSERT(DUK_HOBJECT_HAS_NEWENV(func)); + DUK_ASSERT(act->lex_env == NULL); + DUK_ASSERT(act->var_env == NULL); + + env = duk_create_activation_environment_record(thr, func, act->bottom_byteoff); + DUK_ASSERT(env != NULL); + /* 'act' is a stable pointer, so still OK. */ + + DUK_DDD(DUK_DDDPRINT("created delayed fresh env: %!ipO", (duk_heaphdr *) env)); +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + { + duk_hobject *p = env; + while (p) { + DUK_DDD(DUK_DDDPRINT(" -> %!ipO", (duk_heaphdr *) p)); + p = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, p); + } + } +#endif + + act->lex_env = env; + act->var_env = env; + DUK_HOBJECT_INCREF(thr, env); /* XXX: incref by count (here 2 times) */ + DUK_HOBJECT_INCREF(thr, env); + + duk_pop_unsafe(thr); +} + +/* + * Closing environment records. + * + * The environment record MUST be closed with the thread where its activation + * is; i.e. if 'env' is open, 'thr' must match env->thread, and the regbase + * and varmap must still be valid. On entry, 'env' must be reachable. + */ + +DUK_INTERNAL void duk_js_close_environment_record(duk_hthread *thr, duk_hobject *env) { + duk_uint_fast32_t i; + duk_hobject *varmap; + duk_hstring *key; + duk_tval *tv; + duk_uint_t regnum; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(env != NULL); + + if (DUK_UNLIKELY(!DUK_HOBJECT_IS_DECENV(env))) { + DUK_DDD(DUK_DDDPRINT("env not a declarative record: %!iO", (duk_heaphdr *) env)); + return; + } + + varmap = ((duk_hdecenv *) env)->varmap; + if (varmap == NULL) { + DUK_DDD(DUK_DDDPRINT("env already closed: %!iO", (duk_heaphdr *) env)); + + return; + } + DUK_ASSERT(((duk_hdecenv *) env)->thread != NULL); + DUK_ASSERT_HDECENV_VALID((duk_hdecenv *) env); + + DUK_DDD(DUK_DDDPRINT("closing env: %!iO", (duk_heaphdr *) env)); + DUK_DDD(DUK_DDDPRINT("varmap: %!O", (duk_heaphdr *) varmap)); + + /* Env must be closed in the same thread as where it runs. */ + DUK_ASSERT(((duk_hdecenv *) env)->thread == thr); + + /* XXX: additional conditions when to close variables? we don't want to do it + * unless the environment may have "escaped" (referenced in a function closure). + * With delayed environments, the existence is probably good enough of a check. + */ + + /* Note: we rely on the _Varmap having a bunch of nice properties, like: + * - being compacted and unmodified during this process + * - not containing an array part + * - having correct value types + */ + + DUK_DDD(DUK_DDDPRINT("copying bound register values, %ld bound regs", (long) DUK_HOBJECT_GET_ENEXT(varmap))); + + /* Copy over current variable values from value stack to the + * environment record. The scope object is empty but may + * inherit from another scope which has conflicting names. + */ + + /* XXX: Do this using a once allocated entry area, no side effects. + * Hash part would need special treatment however (maybe copy, and + * then realloc with hash part if large enough). + */ + for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(varmap); i++) { + duk_size_t regbase_byteoff; + + key = DUK_HOBJECT_E_GET_KEY(thr->heap, varmap, i); + DUK_ASSERT(key != NULL); /* assume keys are compact in _Varmap */ + DUK_ASSERT(!DUK_HOBJECT_E_SLOT_IS_ACCESSOR(thr->heap, varmap, i)); /* assume plain values */ + + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, varmap, i); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + DUK_ASSERT(DUK_TVAL_GET_NUMBER(tv) <= (duk_double_t) DUK_UINT32_MAX); /* limits */ +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv)); + regnum = (duk_uint_t) DUK_TVAL_GET_FASTINT_U32(tv); +#else + regnum = (duk_uint_t) DUK_TVAL_GET_NUMBER(tv); +#endif + + regbase_byteoff = ((duk_hdecenv *) env)->regbase_byteoff; + DUK_ASSERT((duk_uint8_t *) thr->valstack + regbase_byteoff + sizeof(duk_tval) * regnum >= (duk_uint8_t *) thr->valstack); + DUK_ASSERT((duk_uint8_t *) thr->valstack + regbase_byteoff + sizeof(duk_tval) * regnum < (duk_uint8_t *) thr->valstack_top); + + /* If property already exists, overwrites silently. + * Property is writable, but not deletable (not configurable + * in terms of property attributes). + */ + duk_push_tval(thr, (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + regbase_byteoff + sizeof(duk_tval) * regnum)); + DUK_DDD(DUK_DDDPRINT("closing identifier %!O -> reg %ld, value %!T", + (duk_heaphdr *) key, + (long) regnum, + (duk_tval *) duk_get_tval(thr, -1))); + duk_hobject_define_property_internal(thr, env, key, DUK_PROPDESC_FLAGS_WE); + } + + /* NULL atomically to avoid inconsistent state + side effects. */ + DUK_HOBJECT_DECREF_NORZ(thr, ((duk_hdecenv *) env)->thread); + DUK_HOBJECT_DECREF_NORZ(thr, ((duk_hdecenv *) env)->varmap); + ((duk_hdecenv *) env)->thread = NULL; + ((duk_hdecenv *) env)->varmap = NULL; + + DUK_DDD(DUK_DDDPRINT("env after closing: %!O", (duk_heaphdr *) env)); +} + +/* + * GETIDREF: a GetIdentifierReference-like helper. + * + * Provides a parent traversing lookup and a single level lookup + * (for HasBinding). + * + * Instead of returning the value, returns a bunch of values allowing + * the caller to read, write, or delete the binding. Value pointers + * are duk_tval pointers which can be mutated directly as long as + * refcounts are properly updated. Note that any operation which may + * reallocate valstacks or compact objects may invalidate the returned + * duk_tval (but not object) pointers, so caller must be very careful. + * + * If starting environment record 'env' is given, 'act' is ignored. + * However, if 'env' is NULL, the caller may identify, in 'act', an + * activation which hasn't had its declarative environment initialized + * yet. The activation registers are then looked up, and its parent + * traversed normally. + * + * The 'out' structure values are only valid if the function returns + * success (non-zero). + */ + +/* lookup name from an open declarative record's registers */ +DUK_LOCAL +duk_bool_t duk__getid_open_decl_env_regs(duk_hthread *thr, + duk_hstring *name, + duk_hdecenv *env, + duk__id_lookup_result *out) { + duk_tval *tv; + duk_size_t reg_rel; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(name != NULL); + DUK_ASSERT(env != NULL); + DUK_ASSERT(out != NULL); + + DUK_ASSERT(DUK_HOBJECT_IS_DECENV((duk_hobject *) env)); + DUK_ASSERT_HDECENV_VALID(env); + + if (env->thread == NULL) { + /* already closed */ + return 0; + } + DUK_ASSERT(env->varmap != NULL); + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, env->varmap, name); + if (DUK_UNLIKELY(tv == NULL)) { + return 0; + } + + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + DUK_ASSERT(DUK_TVAL_GET_NUMBER(tv) <= (duk_double_t) DUK_UINT32_MAX); /* limits */ +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv)); + reg_rel = (duk_size_t) DUK_TVAL_GET_FASTINT_U32(tv); +#else + reg_rel = (duk_size_t) DUK_TVAL_GET_NUMBER(tv); +#endif + DUK_ASSERT_DISABLE(reg_rel >= 0); /* unsigned */ + + tv = (duk_tval *) (void *) ((duk_uint8_t *) env->thread->valstack + env->regbase_byteoff + sizeof(duk_tval) * reg_rel); + DUK_ASSERT(tv >= env->thread->valstack && tv < env->thread->valstack_end); /* XXX: more accurate? */ + + out->value = tv; + out->attrs = DUK_PROPDESC_FLAGS_W; /* registers are mutable, non-deletable */ + out->env = (duk_hobject *) env; + out->holder = NULL; + out->has_this = 0; + return 1; +} + +/* lookup name from current activation record's functions' registers */ +DUK_LOCAL +duk_bool_t duk__getid_activation_regs(duk_hthread *thr, + duk_hstring *name, + duk_activation *act, + duk__id_lookup_result *out) { + duk_tval *tv; + duk_hobject *func; + duk_hobject *varmap; + duk_size_t reg_rel; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(name != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(out != NULL); + + func = DUK_ACT_GET_FUNC(act); + DUK_ASSERT(func != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_NEWENV(func)); + + if (!DUK_HOBJECT_IS_COMPFUNC(func)) { + return 0; + } + + /* XXX: move varmap to duk_hcompfunc struct field. */ + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_INT_VARMAP(thr)); + if (!tv) { + return 0; + } + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); + varmap = DUK_TVAL_GET_OBJECT(tv); + DUK_ASSERT(varmap != NULL); + + tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, varmap, name); + if (!tv) { + return 0; + } + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv)); + reg_rel = (duk_size_t) DUK_TVAL_GET_NUMBER(tv); + DUK_ASSERT_DISABLE(reg_rel >= 0); + DUK_ASSERT(reg_rel < ((duk_hcompfunc *) func)->nregs); + + tv = (duk_tval *) (void *) ((duk_uint8_t *) thr->valstack + act->bottom_byteoff); + tv += reg_rel; + + out->value = tv; + out->attrs = DUK_PROPDESC_FLAGS_W; /* registers are mutable, non-deletable */ + out->env = NULL; + out->holder = NULL; + out->has_this = 0; + return 1; +} + +DUK_LOCAL +duk_bool_t duk__get_identifier_reference(duk_hthread *thr, + duk_hobject *env, + duk_hstring *name, + duk_activation *act, + duk_bool_t parents, + duk__id_lookup_result *out) { + duk_tval *tv; + duk_uint_t sanity; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(env != NULL || act != NULL); + DUK_ASSERT(name != NULL); + DUK_ASSERT(out != NULL); + + DUK_ASSERT(!env || DUK_HOBJECT_IS_ENV(env)); + DUK_ASSERT(!env || !DUK_HOBJECT_HAS_ARRAY_PART(env)); + + /* + * Conceptually, we look for the identifier binding by starting from + * 'env' and following to chain of environment records (represented + * by the prototype chain). + * + * If 'env' is NULL, the current activation does not yet have an + * allocated declarative environment record; this should be treated + * exactly as if the environment record existed but had no bindings + * other than register bindings. + * + * Note: we assume that with the DUK_HOBJECT_FLAG_NEWENV cleared + * the environment will always be initialized immediately; hence + * a NULL 'env' should only happen with the flag set. This is the + * case for: (1) function calls, and (2) strict, direct eval calls. + */ + + if (env == NULL && act != NULL) { + duk_hobject *func; + duk_hcompfunc *f; + + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference: env is NULL, activation is non-NULL -> " + "delayed env case, look up activation regs first")); + + /* + * Try registers + */ + + if (duk__getid_activation_regs(thr, name, act, out)) { + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference successful: " + "name=%!O -> value=%!T, attrs=%ld, has_this=%ld, env=%!O, holder=%!O " + "(found from register bindings when env=NULL)", + (duk_heaphdr *) name, (duk_tval *) out->value, + (long) out->attrs, (long) out->has_this, + (duk_heaphdr *) out->env, (duk_heaphdr *) out->holder)); + return 1; + } + + DUK_DDD(DUK_DDDPRINT("not found in current activation regs")); + + /* + * Not found in registers, proceed to the parent record. + * Here we need to determine what the parent would be, + * if 'env' was not NULL (i.e. same logic as when initializing + * the record). + * + * Note that environment initialization is only deferred when + * DUK_HOBJECT_HAS_NEWENV is set, and this only happens for: + * - Function code + * - Strict eval code + * + * We only need to check _Lexenv here; _Varenv exists only if it + * differs from _Lexenv (and thus _Lexenv will also be present). + */ + + if (!parents) { + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference failed, no parent traversal " + "(not found from register bindings when env=NULL)")); + goto fail_not_found; + } + + func = DUK_ACT_GET_FUNC(act); + DUK_ASSERT(func != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_NEWENV(func)); + f = (duk_hcompfunc *) func; + + env = DUK_HCOMPFUNC_GET_LEXENV(thr->heap, f); + if (!env) { + env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; + } + + DUK_DDD(DUK_DDDPRINT("continue lookup from env: %!iO", + (duk_heaphdr *) env)); + } + + /* + * Prototype walking starting from 'env'. + * + * ('act' is not needed anywhere here.) + */ + + sanity = DUK_HOBJECT_PROTOTYPE_CHAIN_SANITY; + while (env != NULL) { + duk_small_uint_t cl; + duk_uint_t attrs; + + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference, name=%!O, considering env=%p -> %!iO", + (duk_heaphdr *) name, + (void *) env, + (duk_heaphdr *) env)); + + DUK_ASSERT(env != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_ENV(env)); + DUK_ASSERT(!DUK_HOBJECT_HAS_ARRAY_PART(env)); + + cl = DUK_HOBJECT_GET_CLASS_NUMBER(env); + DUK_ASSERT(cl == DUK_HOBJECT_CLASS_OBJENV || cl == DUK_HOBJECT_CLASS_DECENV); + if (cl == DUK_HOBJECT_CLASS_DECENV) { + /* + * Declarative environment record. + * + * Identifiers can never be stored in ancestors and are + * always plain values, so we can use an internal helper + * and access the value directly with an duk_tval ptr. + * + * A closed environment is only indicated by it missing + * the "book-keeping" properties required for accessing + * register-bound variables. + */ + + DUK_ASSERT_HDECENV_VALID((duk_hdecenv *) env); + if (duk__getid_open_decl_env_regs(thr, name, (duk_hdecenv *) env, out)) { + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference successful: " + "name=%!O -> value=%!T, attrs=%ld, has_this=%ld, env=%!O, holder=%!O " + "(declarative environment record, scope open, found in regs)", + (duk_heaphdr *) name, (duk_tval *) out->value, + (long) out->attrs, (long) out->has_this, + (duk_heaphdr *) out->env, (duk_heaphdr *) out->holder)); + return 1; + } + + tv = duk_hobject_find_existing_entry_tval_ptr_and_attrs(thr->heap, env, name, &attrs); + if (tv) { + out->value = tv; + out->attrs = attrs; + out->env = env; + out->holder = env; + out->has_this = 0; + + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference successful: " + "name=%!O -> value=%!T, attrs=%ld, has_this=%ld, env=%!O, holder=%!O " + "(declarative environment record, found in properties)", + (duk_heaphdr *) name, (duk_tval *) out->value, + (long) out->attrs, (long) out->has_this, + (duk_heaphdr *) out->env, (duk_heaphdr *) out->holder)); + return 1; + } + } else { + /* + * Object environment record. + * + * Binding (target) object is an external, uncontrolled object. + * Identifier may be bound in an ancestor property, and may be + * an accessor. Target can also be a Proxy which we must support + * here. + */ + + /* XXX: we could save space by using _Target OR _This. If _Target, assume + * this binding is undefined. If _This, assumes this binding is _This, and + * target is also _This. One property would then be enough. + */ + + duk_hobject *target; + duk_bool_t found; + + DUK_ASSERT(cl == DUK_HOBJECT_CLASS_OBJENV); + DUK_ASSERT_HOBJENV_VALID((duk_hobjenv *) env); + + target = ((duk_hobjenv *) env)->target; + DUK_ASSERT(target != NULL); + + /* Target may be a Proxy or property may be an accessor, so we must + * use an actual, Proxy-aware hasprop check here. + * + * out->holder is NOT set to the actual duk_hobject where the + * property is found, but rather the object binding target object. + */ + +#if defined(DUK_USE_ES6_PROXY) + if (DUK_UNLIKELY(DUK_HOBJECT_IS_PROXY(target))) { + duk_tval tv_name; + duk_tval tv_target_tmp; + + DUK_ASSERT(name != NULL); + DUK_TVAL_SET_STRING(&tv_name, name); + DUK_TVAL_SET_OBJECT(&tv_target_tmp, target); + + found = duk_hobject_hasprop(thr, &tv_target_tmp, &tv_name); + } else +#endif /* DUK_USE_ES6_PROXY */ + { + /* XXX: duk_hobject_hasprop() would be correct for + * non-Proxy objects too, but it is about ~20-25% + * slower at present so separate code paths for + * Proxy and non-Proxy now. + */ + found = duk_hobject_hasprop_raw(thr, target, name); + } + + if (found) { + out->value = NULL; /* can't get value, may be accessor */ + out->attrs = 0; /* irrelevant when out->value == NULL */ + out->env = env; + out->holder = target; + out->has_this = ((duk_hobjenv *) env)->has_this; + + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference successful: " + "name=%!O -> value=%!T, attrs=%ld, has_this=%ld, env=%!O, holder=%!O " + "(object environment record)", + (duk_heaphdr *) name, (duk_tval *) out->value, + (long) out->attrs, (long) out->has_this, + (duk_heaphdr *) out->env, (duk_heaphdr *) out->holder)); + return 1; + } + } + + if (!parents) { + DUK_DDD(DUK_DDDPRINT("duk__get_identifier_reference failed, no parent traversal " + "(not found from first traversed env)")); + goto fail_not_found; + } + + if (DUK_UNLIKELY(sanity-- == 0)) { + DUK_ERROR_RANGE(thr, DUK_STR_PROTOTYPE_CHAIN_LIMIT); + DUK_WO_NORETURN(return 0;); + } + env = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, env); + } + + /* + * Not found (even in global object) + */ + + fail_not_found: + return 0; +} + +/* + * HASVAR: check identifier binding from a given environment record + * without traversing its parents. + * + * This primitive is not exposed to user code as such, but is used + * internally for e.g. declaration binding instantiation. + * + * See E5 Sections: + * 10.2.1.1.1 HasBinding(N) + * 10.2.1.2.1 HasBinding(N) + * + * Note: strictness has no bearing on this check. Hence we don't take + * a 'strict' parameter. + */ + +#if 0 /*unused*/ +DUK_INTERNAL +duk_bool_t duk_js_hasvar_envrec(duk_hthread *thr, + duk_hobject *env, + duk_hstring *name) { + duk__id_lookup_result ref; + duk_bool_t parents; + + DUK_DDD(DUK_DDDPRINT("hasvar: thr=%p, env=%p, name=%!O " + "(env -> %!dO)", + (void *) thr, (void *) env, (duk_heaphdr *) name, + (duk_heaphdr *) env)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(env != NULL); + DUK_ASSERT(name != NULL); + + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(env); + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(name); + + DUK_ASSERT(DUK_HOBJECT_IS_ENV(env)); + DUK_ASSERT(!DUK_HOBJECT_HAS_ARRAY_PART(env)); + + /* lookup results is ignored */ + parents = 0; + return duk__get_identifier_reference(thr, env, name, NULL, parents, &ref); +} +#endif + +/* + * GETVAR + * + * See E5 Sections: + * 11.1.2 Identifier Reference + * 10.3.1 Identifier Resolution + * 11.13.1 Simple Assignment [example of where the Reference is GetValue'd] + * 8.7.1 GetValue (V) + * 8.12.1 [[GetOwnProperty]] (P) + * 8.12.2 [[GetProperty]] (P) + * 8.12.3 [[Get]] (P) + * + * If 'throw' is true, always leaves two values on top of stack: [val this]. + * + * If 'throw' is false, returns 0 if identifier cannot be resolved, and the + * stack will be unaffected in this case. If identifier is resolved, returns + * 1 and leaves [val this] on top of stack. + * + * Note: the 'strict' flag of a reference returned by GetIdentifierReference + * is ignored by GetValue. Hence we don't take a 'strict' parameter. + * + * The 'throw' flag is needed for implementing 'typeof' for an unreferenced + * identifier. An unreference identifier in other contexts generates a + * ReferenceError. + */ + +DUK_LOCAL +duk_bool_t duk__getvar_helper(duk_hthread *thr, + duk_hobject *env, + duk_activation *act, + duk_hstring *name, + duk_bool_t throw_flag) { + duk__id_lookup_result ref; + duk_tval tv_tmp_obj; + duk_tval tv_tmp_key; + duk_bool_t parents; + + DUK_DDD(DUK_DDDPRINT("getvar: thr=%p, env=%p, act=%p, name=%!O " + "(env -> %!dO)", + (void *) thr, (void *) env, (void *) act, + (duk_heaphdr *) name, (duk_heaphdr *) env)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(name != NULL); + /* env and act may be NULL */ + + DUK_STATS_INC(thr->heap, stats_getvar_all); + + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(env); + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(name); + + parents = 1; /* follow parent chain */ + if (duk__get_identifier_reference(thr, env, name, act, parents, &ref)) { + if (ref.value) { + duk_push_tval(thr, ref.value); + duk_push_undefined(thr); + } else { + DUK_ASSERT(ref.holder != NULL); + + /* ref.holder is safe across the getprop call (even + * with side effects) because 'env' is reachable and + * ref.holder is a direct heap pointer. + */ + + DUK_TVAL_SET_OBJECT(&tv_tmp_obj, ref.holder); + DUK_TVAL_SET_STRING(&tv_tmp_key, name); + (void) duk_hobject_getprop(thr, &tv_tmp_obj, &tv_tmp_key); /* [value] */ + + if (ref.has_this) { + duk_push_hobject(thr, ref.holder); + } else { + duk_push_undefined(thr); + } + + /* [value this] */ + } + + return 1; + } else { + if (throw_flag) { + DUK_ERROR_FMT1(thr, DUK_ERR_REFERENCE_ERROR, + "identifier '%s' undefined", + (const char *) DUK_HSTRING_GET_DATA(name)); + DUK_WO_NORETURN(return 0;); + } + + return 0; + } +} + +DUK_INTERNAL +duk_bool_t duk_js_getvar_envrec(duk_hthread *thr, + duk_hobject *env, + duk_hstring *name, + duk_bool_t throw_flag) { + return duk__getvar_helper(thr, env, NULL, name, throw_flag); +} + +DUK_INTERNAL +duk_bool_t duk_js_getvar_activation(duk_hthread *thr, + duk_activation *act, + duk_hstring *name, + duk_bool_t throw_flag) { + DUK_ASSERT(act != NULL); + return duk__getvar_helper(thr, act->lex_env, act, name, throw_flag); +} + +/* + * PUTVAR + * + * See E5 Sections: + * 11.1.2 Identifier Reference + * 10.3.1 Identifier Resolution + * 11.13.1 Simple Assignment [example of where the Reference is PutValue'd] + * 8.7.2 PutValue (V,W) [see especially step 3.b, undefined -> automatic global in non-strict mode] + * 8.12.4 [[CanPut]] (P) + * 8.12.5 [[Put]] (P) + * + * Note: may invalidate any valstack (or object) duk_tval pointers because + * putting a value may reallocate any object or any valstack. Caller beware. + */ + +DUK_LOCAL +void duk__putvar_helper(duk_hthread *thr, + duk_hobject *env, + duk_activation *act, + duk_hstring *name, + duk_tval *val, + duk_bool_t strict) { + duk__id_lookup_result ref; + duk_tval tv_tmp_obj; + duk_tval tv_tmp_key; + duk_bool_t parents; + + DUK_STATS_INC(thr->heap, stats_putvar_all); + + DUK_DDD(DUK_DDDPRINT("putvar: thr=%p, env=%p, act=%p, name=%!O, val=%p, strict=%ld " + "(env -> %!dO, val -> %!T)", + (void *) thr, (void *) env, (void *) act, + (duk_heaphdr *) name, (void *) val, (long) strict, + (duk_heaphdr *) env, (duk_tval *) val)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(name != NULL); + DUK_ASSERT(val != NULL); + /* env and act may be NULL */ + + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(env); + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(name); + DUK_ASSERT_REFCOUNT_NONZERO_TVAL(val); + + /* + * In strict mode E5 protects 'eval' and 'arguments' from being + * assigned to (or even declared anywhere). Attempt to do so + * should result in a compile time SyntaxError. See the internal + * design documentation for details. + * + * Thus, we should never come here, run-time, for strict code, + * and name 'eval' or 'arguments'. + */ + + DUK_ASSERT(!strict || + (name != DUK_HTHREAD_STRING_EVAL(thr) && + name != DUK_HTHREAD_STRING_LC_ARGUMENTS(thr))); + + /* + * Lookup variable and update in-place if found. + */ + + parents = 1; /* follow parent chain */ + + if (duk__get_identifier_reference(thr, env, name, act, parents, &ref)) { + if (ref.value && (ref.attrs & DUK_PROPDESC_FLAG_WRITABLE)) { + /* Update duk_tval in-place if pointer provided and the + * property is writable. If the property is not writable + * (immutable binding), use duk_hobject_putprop() which + * will respect mutability. + */ + duk_tval *tv_val; + + tv_val = ref.value; + DUK_ASSERT(tv_val != NULL); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv_val, val); /* side effects */ + + /* ref.value invalidated here */ + } else { + DUK_ASSERT(ref.holder != NULL); + + DUK_TVAL_SET_OBJECT(&tv_tmp_obj, ref.holder); + DUK_TVAL_SET_STRING(&tv_tmp_key, name); + (void) duk_hobject_putprop(thr, &tv_tmp_obj, &tv_tmp_key, val, strict); + + /* ref.value invalidated here */ + } + + return; + } + + /* + * Not found: write to global object (non-strict) or ReferenceError + * (strict); see E5 Section 8.7.2, step 3. + */ + + if (strict) { + DUK_DDD(DUK_DDDPRINT("identifier binding not found, strict => reference error")); + DUK_ERROR_FMT1(thr, DUK_ERR_REFERENCE_ERROR, + "identifier '%s' undefined", + (const char *) DUK_HSTRING_GET_DATA(name)); + DUK_WO_NORETURN(return;); + } + + DUK_DDD(DUK_DDDPRINT("identifier binding not found, not strict => set to global")); + + DUK_TVAL_SET_OBJECT(&tv_tmp_obj, thr->builtins[DUK_BIDX_GLOBAL]); + DUK_TVAL_SET_STRING(&tv_tmp_key, name); + (void) duk_hobject_putprop(thr, &tv_tmp_obj, &tv_tmp_key, val, 0); /* 0 = no throw */ + + /* NB: 'val' may be invalidated here because put_value may realloc valstack, + * caller beware. + */ +} + +DUK_INTERNAL +void duk_js_putvar_envrec(duk_hthread *thr, + duk_hobject *env, + duk_hstring *name, + duk_tval *val, + duk_bool_t strict) { + duk__putvar_helper(thr, env, NULL, name, val, strict); +} + +DUK_INTERNAL +void duk_js_putvar_activation(duk_hthread *thr, + duk_activation *act, + duk_hstring *name, + duk_tval *val, + duk_bool_t strict) { + DUK_ASSERT(act != NULL); + duk__putvar_helper(thr, act->lex_env, act, name, val, strict); +} + +/* + * DELVAR + * + * See E5 Sections: + * 11.4.1 The delete operator + * 10.2.1.1.5 DeleteBinding (N) [declarative environment record] + * 10.2.1.2.5 DeleteBinding (N) [object environment record] + * + * Variable bindings established inside eval() are deletable (configurable), + * other bindings are not, including variables declared in global level. + * Registers are always non-deletable, and the deletion of other bindings + * is controlled by the configurable flag. + * + * For strict mode code, the 'delete' operator should fail with a compile + * time SyntaxError if applied to identifiers. Hence, no strict mode + * run-time deletion of identifiers should ever happen. This function + * should never be called from strict mode code! + */ + +DUK_LOCAL +duk_bool_t duk__delvar_helper(duk_hthread *thr, + duk_hobject *env, + duk_activation *act, + duk_hstring *name) { + duk__id_lookup_result ref; + duk_bool_t parents; + + DUK_DDD(DUK_DDDPRINT("delvar: thr=%p, env=%p, act=%p, name=%!O " + "(env -> %!dO)", + (void *) thr, (void *) env, (void *) act, + (duk_heaphdr *) name, (duk_heaphdr *) env)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(name != NULL); + /* env and act may be NULL */ + + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR(name); + + parents = 1; /* follow parent chain */ + + if (duk__get_identifier_reference(thr, env, name, act, parents, &ref)) { + if (ref.value && !(ref.attrs & DUK_PROPDESC_FLAG_CONFIGURABLE)) { + /* Identifier found in registers (always non-deletable) + * or declarative environment record and non-configurable. + */ + return 0; + } + DUK_ASSERT(ref.holder != NULL); + + return duk_hobject_delprop_raw(thr, ref.holder, name, 0); + } + + /* + * Not found (even in global object). + * + * In non-strict mode this is a silent SUCCESS (!), see E5 Section 11.4.1, + * step 3.b. In strict mode this case is a compile time SyntaxError so + * we should not come here. + */ + + DUK_DDD(DUK_DDDPRINT("identifier to be deleted not found: name=%!O " + "(treated as silent success)", + (duk_heaphdr *) name)); + return 1; +} + +#if 0 /*unused*/ +DUK_INTERNAL +duk_bool_t duk_js_delvar_envrec(duk_hthread *thr, + duk_hobject *env, + duk_hstring *name) { + return duk__delvar_helper(thr, env, NULL, name); +} +#endif + +DUK_INTERNAL +duk_bool_t duk_js_delvar_activation(duk_hthread *thr, + duk_activation *act, + duk_hstring *name) { + DUK_ASSERT(act != NULL); + return duk__delvar_helper(thr, act->lex_env, act, name); +} + +/* + * DECLVAR + * + * See E5 Sections: + * 10.4.3 Entering Function Code + * 10.5 Declaration Binding Instantion + * 12.2 Variable Statement + * 11.1.2 Identifier Reference + * 10.3.1 Identifier Resolution + * + * Variable declaration behavior is mainly discussed in Section 10.5, + * and is not discussed in the execution semantics (Sections 11-13). + * + * Conceptually declarations happen when code (global, eval, function) + * is entered, before any user code is executed. In practice, register- + * bound identifiers are 'declared' automatically (by virtue of being + * allocated to registers with the initial value 'undefined'). Other + * identifiers are declared in the function prologue with this primitive. + * + * Since non-register bindings eventually back to an internal object's + * properties, the 'prop_flags' argument is used to specify binding + * type: + * + * - Immutable binding: set DUK_PROPDESC_FLAG_WRITABLE to false + * - Non-deletable binding: set DUK_PROPDESC_FLAG_CONFIGURABLE to false + * - The flag DUK_PROPDESC_FLAG_ENUMERABLE should be set, although it + * doesn't really matter for internal objects + * + * All bindings are non-deletable mutable bindings except: + * + * - Declarations in eval code (mutable, deletable) + * - 'arguments' binding in strict function code (immutable) + * - Function name binding of a function expression (immutable) + * + * Declarations may go to declarative environment records (always + * so for functions), but may also go to object environment records + * (e.g. global code). The global object environment has special + * behavior when re-declaring a function (but not a variable); see + * E5.1 specification, Section 10.5, step 5.e. + * + * Declarations always go to the 'top-most' environment record, i.e. + * we never check the record chain. It's not an error even if a + * property (even an immutable or non-deletable one) of the same name + * already exists. + * + * If a declared variable already exists, its value needs to be updated + * (if possible). Returns 1 if a PUTVAR needs to be done by the caller; + * otherwise returns 0. + */ + +DUK_LOCAL +duk_bool_t duk__declvar_helper(duk_hthread *thr, + duk_hobject *env, + duk_hstring *name, + duk_tval *val, + duk_small_uint_t prop_flags, + duk_bool_t is_func_decl) { + duk_hobject *holder; + duk_bool_t parents; + duk__id_lookup_result ref; + duk_tval *tv; + + DUK_DDD(DUK_DDDPRINT("declvar: thr=%p, env=%p, name=%!O, val=%!T, prop_flags=0x%08lx, is_func_decl=%ld " + "(env -> %!iO)", + (void *) thr, (void *) env, (duk_heaphdr *) name, + (duk_tval *) val, (unsigned long) prop_flags, + (unsigned int) is_func_decl, (duk_heaphdr *) env)); + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(env != NULL); + DUK_ASSERT(name != NULL); + DUK_ASSERT(val != NULL); + + /* Note: in strict mode the compiler should reject explicit + * declaration of 'eval' or 'arguments'. However, internal + * bytecode may declare 'arguments' in the function prologue. + * We don't bother checking (or asserting) for these now. + */ + + /* Note: val is a stable duk_tval pointer. The caller makes + * a value copy into its stack frame, so 'tv_val' is not subject + * to side effects here. + */ + + /* + * Check whether already declared. + * + * We need to check whether the binding exists in the environment + * without walking its parents. However, we still need to check + * register-bound identifiers and the prototype chain of an object + * environment target object. + */ + + parents = 0; /* just check 'env' */ + if (duk__get_identifier_reference(thr, env, name, NULL, parents, &ref)) { + duk_int_t e_idx; + duk_int_t h_idx; + duk_small_uint_t flags; + + /* + * Variable already declared, ignore re-declaration. + * The only exception is the updated behavior of E5.1 for + * global function declarations, E5.1 Section 10.5, step 5.e. + * This behavior does not apply to global variable declarations. + */ + + if (!(is_func_decl && env == thr->builtins[DUK_BIDX_GLOBAL_ENV])) { + DUK_DDD(DUK_DDDPRINT("re-declare a binding, ignoring")); + return 1; /* 1 -> needs a PUTVAR */ + } + + /* + * Special behavior in E5.1. + * + * Note that even though parents == 0, the conflicting property + * may be an inherited property (currently our global object's + * prototype is Object.prototype). Step 5.e first operates on + * the existing property (which is potentially in an ancestor) + * and then defines a new property in the global object (and + * never modifies the ancestor). + * + * Also note that this logic would become even more complicated + * if the conflicting property might be a virtual one. Object + * prototype has no virtual properties, though. + * + * XXX: this is now very awkward, rework. + */ + + DUK_DDD(DUK_DDDPRINT("re-declare a function binding in global object, " + "updated E5.1 processing")); + + DUK_ASSERT(ref.holder != NULL); + holder = ref.holder; + + /* holder will be set to the target object, not the actual object + * where the property was found (see duk__get_identifier_reference()). + */ + DUK_ASSERT(DUK_HOBJECT_GET_CLASS_NUMBER(holder) == DUK_HOBJECT_CLASS_GLOBAL); + DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARRAY(holder)); /* global object doesn't have array part */ + + /* XXX: use a helper for prototype traversal; no loop check here */ + /* must be found: was found earlier, and cannot be inherited */ + for (;;) { + DUK_ASSERT(holder != NULL); + if (duk_hobject_find_existing_entry(thr->heap, holder, name, &e_idx, &h_idx)) { + DUK_ASSERT(e_idx >= 0); + break; + } + /* SCANBUILD: NULL pointer dereference, doesn't actually trigger, + * asserted above. + */ + holder = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, holder); + } + DUK_ASSERT(holder != NULL); + DUK_ASSERT(e_idx >= 0); + /* SCANBUILD: scan-build produces a NULL pointer dereference warning + * below; it never actually triggers because holder is actually never + * NULL. + */ + + /* ref.holder is global object, holder is the object with the + * conflicting property. + */ + + flags = DUK_HOBJECT_E_GET_FLAGS(thr->heap, holder, e_idx); + if (!(flags & DUK_PROPDESC_FLAG_CONFIGURABLE)) { + if (flags & DUK_PROPDESC_FLAG_ACCESSOR) { + DUK_DDD(DUK_DDDPRINT("existing property is a non-configurable " + "accessor -> reject")); + goto fail_existing_attributes; + } + if (!((flags & DUK_PROPDESC_FLAG_WRITABLE) && + (flags & DUK_PROPDESC_FLAG_ENUMERABLE))) { + DUK_DDD(DUK_DDDPRINT("existing property is a non-configurable " + "plain property which is not writable and " + "enumerable -> reject")); + goto fail_existing_attributes; + } + + DUK_DDD(DUK_DDDPRINT("existing property is not configurable but " + "is plain, enumerable, and writable -> " + "allow redeclaration")); + } + + if (holder == ref.holder) { + /* XXX: if duk_hobject_define_property_internal() was updated + * to handle a pre-existing accessor property, this would be + * a simple call (like for the ancestor case). + */ + DUK_DDD(DUK_DDDPRINT("redefine, offending property in global object itself")); + + if (flags & DUK_PROPDESC_FLAG_ACCESSOR) { + duk_hobject *tmp; + + tmp = DUK_HOBJECT_E_GET_VALUE_GETTER(thr->heap, holder, e_idx); + DUK_HOBJECT_E_SET_VALUE_GETTER(thr->heap, holder, e_idx, NULL); + DUK_HOBJECT_DECREF_ALLOWNULL(thr, tmp); + DUK_UNREF(tmp); + tmp = DUK_HOBJECT_E_GET_VALUE_SETTER(thr->heap, holder, e_idx); + DUK_HOBJECT_E_SET_VALUE_SETTER(thr->heap, holder, e_idx, NULL); + DUK_HOBJECT_DECREF_ALLOWNULL(thr, tmp); + DUK_UNREF(tmp); + } else { + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, holder, e_idx); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv); + } + + /* Here val would be potentially invalid if we didn't make + * a value copy at the caller. + */ + + tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, holder, e_idx); + DUK_TVAL_SET_TVAL(tv, val); + DUK_TVAL_INCREF(thr, tv); + DUK_HOBJECT_E_SET_FLAGS(thr->heap, holder, e_idx, prop_flags); + + DUK_DDD(DUK_DDDPRINT("updated global binding, final result: " + "value -> %!T, prop_flags=0x%08lx", + (duk_tval *) DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(thr->heap, holder, e_idx), + (unsigned long) prop_flags)); + } else { + DUK_DDD(DUK_DDDPRINT("redefine, offending property in ancestor")); + + DUK_ASSERT(ref.holder == thr->builtins[DUK_BIDX_GLOBAL]); + duk_push_tval(thr, val); + duk_hobject_define_property_internal(thr, ref.holder, name, prop_flags); + } + + return 0; + } + + /* + * Not found (in registers or record objects). Declare + * to current variable environment. + */ + + /* + * Get holder object + */ + + if (DUK_HOBJECT_IS_DECENV(env)) { + DUK_ASSERT_HDECENV_VALID((duk_hdecenv *) env); + holder = env; + } else { + DUK_ASSERT_HOBJENV_VALID((duk_hobjenv *) env); + holder = ((duk_hobjenv *) env)->target; + DUK_ASSERT(holder != NULL); + } + + /* + * Define new property + * + * Note: this may fail if the holder is not extensible. + */ + + /* XXX: this is awkward as we use an internal method which doesn't handle + * extensibility etc correctly. Basically we'd want to do a [[DefineOwnProperty]] + * or Object.defineProperty() here. + */ + + if (!DUK_HOBJECT_HAS_EXTENSIBLE(holder)) { + goto fail_not_extensible; + } + + duk_push_hobject(thr, holder); + duk_push_hstring(thr, name); + duk_push_tval(thr, val); + duk_xdef_prop(thr, -3, prop_flags); /* [holder name val] -> [holder] */ + duk_pop_unsafe(thr); + + return 0; + + fail_existing_attributes: + fail_not_extensible: + DUK_ERROR_TYPE(thr, "declaration failed"); + DUK_WO_NORETURN(return 0;); +} + +DUK_INTERNAL +duk_bool_t duk_js_declvar_activation(duk_hthread *thr, + duk_activation *act, + duk_hstring *name, + duk_tval *val, + duk_small_uint_t prop_flags, + duk_bool_t is_func_decl) { + duk_hobject *env; + duk_tval tv_val_copy; + + DUK_ASSERT(act != NULL); + + /* + * Make a value copy of the input val. This ensures that + * side effects cannot invalidate the pointer. + */ + + DUK_TVAL_SET_TVAL(&tv_val_copy, val); + val = &tv_val_copy; + + /* + * Delayed env creation check + */ + + if (!act->var_env) { + DUK_ASSERT(act->lex_env == NULL); + duk_js_init_activation_environment_records_delayed(thr, act); + /* 'act' is a stable pointer, so still OK. */ + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + + env = act->var_env; + DUK_ASSERT(env != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_ENV(env)); + + return duk__declvar_helper(thr, env, name, val, prop_flags, is_func_decl); +} +#line 1 "duk_lexer.c" +/* + * Lexer for source files, ToNumber() string conversions, RegExp expressions, + * and JSON. + * + * Provides a stream of ECMAScript tokens from an UTF-8/CESU-8 buffer. The + * caller can also rewind the token stream into a certain position which is + * needed by the compiler part for multi-pass scanning. Tokens are + * represented as duk_token structures, and contain line number information. + * Token types are identified with DUK_TOK_* defines. + * + * Characters are decoded into a fixed size lookup window consisting of + * decoded Unicode code points, with window positions past the end of the + * input filled with an invalid codepoint (-1). The tokenizer can thus + * perform multiple character lookups efficiently and with few sanity + * checks (such as access outside the end of the input), which keeps the + * tokenization code small at the cost of performance. + * + * Character data in tokens, such as identifier names and string literals, + * is encoded into CESU-8 format on-the-fly while parsing the token in + * question. The string data is made reachable to garbage collection by + * placing the token-related values in value stack entries allocated for + * this purpose by the caller. The characters exist in Unicode code point + * form only in the fixed size lookup window, which keeps character data + * expansion (of especially ASCII data) low. + * + * Token parsing supports the full range of Unicode characters as described + * in the E5 specification. Parsing has been optimized for ASCII characters + * because ordinary ECMAScript code consists almost entirely of ASCII + * characters. Matching of complex Unicode codepoint sets (such as in the + * IdentifierStart and IdentifierPart productions) is optimized for size, + * and is done using a linear scan of a bit-packed list of ranges. This is + * very slow, but should never be entered unless the source code actually + * contains Unicode characters. + * + * ECMAScript tokenization is partially context sensitive. First, + * additional future reserved words are recognized in strict mode (see E5 + * Section 7.6.1.2). Second, a forward slash character ('/') can be + * recognized either as starting a RegExp literal or as a division operator, + * depending on context. The caller must provide necessary context flags + * when requesting a new token. + * + * Future work: + * + * * Make line number tracking optional, as it consumes space. + * + * * Add a feature flag for disabling UTF-8 decoding of input, as most + * source code is ASCII. Because of Unicode escapes written in ASCII, + * this does not allow Unicode support to be removed from e.g. + * duk_unicode_is_identifier_start() nor does it allow removal of CESU-8 + * encoding of e.g. string literals. + * + * * Add a feature flag for disabling Unicode compliance of e.g. identifier + * names. This allows for a build more than a kilobyte smaller, because + * Unicode ranges needed by duk_unicode_is_identifier_start() and + * duk_unicode_is_identifier_part() can be dropped. String literals + * should still be allowed to contain escaped Unicode, so this still does + * not allow removal of CESU-8 encoding of e.g. string literals. + * + * * Character lookup tables for codepoints above BMP could be stripped. + * + * * Strictly speaking, E5 specification requires that source code consists + * of 16-bit code units, and if not, must be conceptually converted to + * that format first. The current lexer processes Unicode code points + * and allows characters outside the BMP. These should be converted to + * surrogate pairs while reading the source characters into the window, + * not after tokens have been formed (as is done now). However, the fix + * is not trivial because two characters are decoded from one codepoint. + * + * * Optimize for speed as well as size. Large if-else ladders are (at + * least potentially) slow. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Various defines and file specific helper macros + */ + +#define DUK__MAX_RE_DECESC_DIGITS 9 +#define DUK__MAX_RE_QUANT_DIGITS 9 /* Does not allow e.g. 2**31-1, but one more would allow overflows of u32. */ + +/* whether to use macros or helper function depends on call count */ +#define DUK__ISDIGIT(x) ((x) >= DUK_ASC_0 && (x) <= DUK_ASC_9) +#define DUK__ISHEXDIGIT(x) duk__is_hex_digit((x)) +#define DUK__ISOCTDIGIT(x) ((x) >= DUK_ASC_0 && (x) <= DUK_ASC_7) +#define DUK__ISDIGIT03(x) ((x) >= DUK_ASC_0 && (x) <= DUK_ASC_3) +#define DUK__ISDIGIT47(x) ((x) >= DUK_ASC_4 && (x) <= DUK_ASC_7) + +/* lexer character window helpers */ +#define DUK__LOOKUP(lex_ctx,idx) ((lex_ctx)->window[(idx)].codepoint) +#define DUK__ADVANCECHARS(lex_ctx,count) duk__advance_chars((lex_ctx), (count)) +#define DUK__ADVANCEBYTES(lex_ctx,count) duk__advance_bytes((lex_ctx), (count)) +#define DUK__INITBUFFER(lex_ctx) duk__initbuffer((lex_ctx)) +#define DUK__APPENDBUFFER(lex_ctx,x) duk__appendbuffer((lex_ctx), (duk_codepoint_t) (x)) +#define DUK__APPENDBUFFER_ASCII(lex_ctx,x) duk__appendbuffer_ascii((lex_ctx), (duk_codepoint_t) (x)) + +/* lookup shorthands (note: assume context variable is named 'lex_ctx') */ +#define DUK__L0() DUK__LOOKUP(lex_ctx, 0) +#define DUK__L1() DUK__LOOKUP(lex_ctx, 1) +#define DUK__L2() DUK__LOOKUP(lex_ctx, 2) +#define DUK__L3() DUK__LOOKUP(lex_ctx, 3) +#define DUK__L4() DUK__LOOKUP(lex_ctx, 4) +#define DUK__L5() DUK__LOOKUP(lex_ctx, 5) + +/* packed advance/token number macro used by multiple functions */ +#define DUK__ADVTOK(advbytes,tok) ((((advbytes) * sizeof(duk_lexer_codepoint)) << 8) + (tok)) + +/* + * Advance lookup window by N characters, filling in new characters as + * necessary. After returning caller is guaranteed a character window of + * at least DUK_LEXER_WINDOW_SIZE characters. + * + * The main function duk__advance_bytes() is called at least once per every + * token so it has a major lexer/compiler performance impact. There are two + * variants for the main duk__advance_bytes() algorithm: a sliding window + * approach which is slightly faster at the cost of larger code footprint, + * and a simple copying one. + * + * Decoding directly from the source string would be another lexing option. + * But the lookup window based approach has the advantage of hiding the + * source string and its encoding effectively which gives more flexibility + * going forward to e.g. support chunked streaming of source from flash. + * + * Decodes UTF-8/CESU-8 leniently with support for code points from U+0000 to + * U+10FFFF, causing an error if the input is unparseable. Leniency means: + * + * * Unicode code point validation is intentionally not performed, + * except to check that the codepoint does not exceed 0x10ffff. + * + * * In particular, surrogate pairs are allowed and not combined, which + * allows source files to represent all SourceCharacters with CESU-8. + * Broken surrogate pairs are allowed, as ECMAScript does not mandate + * their validation. + * + * * Allow non-shortest UTF-8 encodings. + * + * Leniency here causes few security concerns because all character data is + * decoded into Unicode codepoints before lexer processing, and is then + * re-encoded into CESU-8. The source can be parsed as strict UTF-8 with + * a compiler option. However, ECMAScript source characters include -all- + * 16-bit unsigned integer codepoints, so leniency seems to be appropriate. + * + * Note that codepoints above the BMP are not strictly SourceCharacters, + * but the lexer still accepts them as such. Before ending up in a string + * or an identifier name, codepoints above BMP are converted into surrogate + * pairs and then CESU-8 encoded, resulting in 16-bit Unicode data as + * expected by ECMAScript. + * + * An alternative approach to dealing with invalid or partial sequences + * would be to skip them and replace them with e.g. the Unicode replacement + * character U+FFFD. This has limited utility because a replacement character + * will most likely cause a parse error, unless it occurs inside a string. + * Further, ECMAScript source is typically pure ASCII. + * + * See: + * + * http://en.wikipedia.org/wiki/UTF-8 + * http://en.wikipedia.org/wiki/CESU-8 + * http://tools.ietf.org/html/rfc3629 + * http://en.wikipedia.org/wiki/UTF-8#Invalid_byte_sequences + * + * Future work: + * + * * Reject other invalid Unicode sequences (see Wikipedia entry for examples) + * in strict UTF-8 mode. + * + * * Size optimize. An attempt to use a 16-byte lookup table for the first + * byte resulted in a code increase though. + * + * * Is checking against maximum 0x10ffff really useful? 4-byte encoding + * imposes a certain limit anyway. + * + * * Support chunked streaming of source code. Can be implemented either + * by streaming chunks of bytes or chunks of codepoints. + */ + +#if defined(DUK_USE_LEXER_SLIDING_WINDOW) +DUK_LOCAL void duk__fill_lexer_buffer(duk_lexer_ctx *lex_ctx, duk_small_uint_t start_offset_bytes) { + duk_lexer_codepoint *cp, *cp_end; + duk_ucodepoint_t x; + duk_small_uint_t contlen; + const duk_uint8_t *p, *p_end; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + duk_ucodepoint_t mincp; +#endif + duk_int_t input_line; + + /* Use temporaries and update lex_ctx only when finished. */ + input_line = lex_ctx->input_line; + p = lex_ctx->input + lex_ctx->input_offset; + p_end = lex_ctx->input + lex_ctx->input_length; + + cp = (duk_lexer_codepoint *) (void *) ((duk_uint8_t *) lex_ctx->buffer + start_offset_bytes); + cp_end = lex_ctx->buffer + DUK_LEXER_BUFFER_SIZE; + + for (; cp != cp_end; cp++) { + cp->offset = (duk_size_t) (p - lex_ctx->input); + cp->line = input_line; + + /* XXX: potential issue with signed pointers, p_end < p. */ + if (DUK_UNLIKELY(p >= p_end)) { + /* If input_offset were assigned a negative value, it would + * result in a large positive value. Most likely it would be + * larger than input_length and be caught here. In any case + * no memory unsafe behavior would happen. + */ + cp->codepoint = -1; + continue; + } + + x = (duk_ucodepoint_t) (*p++); + + /* Fast path. */ + + if (DUK_LIKELY(x < 0x80UL)) { + DUK_ASSERT(x != 0x2028UL && x != 0x2029UL); /* not LS/PS */ + if (DUK_UNLIKELY(x <= 0x000dUL)) { + if ((x == 0x000aUL) || + ((x == 0x000dUL) && (p >= p_end || *p != 0x000aUL))) { + /* lookup for 0x000a above assumes shortest encoding now */ + + /* E5 Section 7.3, treat the following as newlines: + * LF + * CR [not followed by LF] + * LS + * PS + * + * For CR LF, CR is ignored if it is followed by LF, and the LF will bump + * the line number. + */ + input_line++; + } + } + + cp->codepoint = (duk_codepoint_t) x; + continue; + } + + /* Slow path. */ + + if (x < 0xc0UL) { + /* 10xx xxxx -> invalid */ + goto error_encoding; + } else if (x < 0xe0UL) { + /* 110x xxxx 10xx xxxx */ + contlen = 1; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + mincp = 0x80UL; +#endif + x = x & 0x1fUL; + } else if (x < 0xf0UL) { + /* 1110 xxxx 10xx xxxx 10xx xxxx */ + contlen = 2; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + mincp = 0x800UL; +#endif + x = x & 0x0fUL; + } else if (x < 0xf8UL) { + /* 1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx */ + contlen = 3; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + mincp = 0x10000UL; +#endif + x = x & 0x07UL; + } else { + /* no point in supporting encodings of 5 or more bytes */ + goto error_encoding; + } + + DUK_ASSERT(p_end >= p); + if ((duk_size_t) contlen > (duk_size_t) (p_end - p)) { + goto error_clipped; + } + + while (contlen > 0) { + duk_small_uint_t y; + y = *p++; + if ((y & 0xc0U) != 0x80U) { + /* check that byte has the form 10xx xxxx */ + goto error_encoding; + } + x = x << 6; + x += y & 0x3fUL; + contlen--; + } + + /* check final character validity */ + + if (x > 0x10ffffUL) { + goto error_encoding; + } +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + if (x < mincp || (x >= 0xd800UL && x <= 0xdfffUL) || x == 0xfffeUL) { + goto error_encoding; + } +#endif + + DUK_ASSERT(x != 0x000aUL && x != 0x000dUL); + if ((x == 0x2028UL) || (x == 0x2029UL)) { + input_line++; + } + + cp->codepoint = (duk_codepoint_t) x; + } + + lex_ctx->input_offset = (duk_size_t) (p - lex_ctx->input); + lex_ctx->input_line = input_line; + return; + + error_clipped: /* clipped codepoint */ + error_encoding: /* invalid codepoint encoding or codepoint */ + lex_ctx->input_offset = (duk_size_t) (p - lex_ctx->input); + lex_ctx->input_line = input_line; + + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_SOURCE_DECODE_FAILED); + DUK_WO_NORETURN(return;); +} + +DUK_LOCAL void duk__advance_bytes(duk_lexer_ctx *lex_ctx, duk_small_uint_t count_bytes) { + duk_small_uint_t used_bytes, avail_bytes; + + DUK_ASSERT_DISABLE(count_bytes >= 0); /* unsigned */ + DUK_ASSERT(count_bytes <= (duk_small_uint_t) (DUK_LEXER_WINDOW_SIZE * sizeof(duk_lexer_codepoint))); + DUK_ASSERT(lex_ctx->window >= lex_ctx->buffer); + DUK_ASSERT(lex_ctx->window < lex_ctx->buffer + DUK_LEXER_BUFFER_SIZE); + DUK_ASSERT((duk_uint8_t *) lex_ctx->window + count_bytes <= (duk_uint8_t *) lex_ctx->buffer + DUK_LEXER_BUFFER_SIZE * sizeof(duk_lexer_codepoint)); + + /* Zero 'count' is also allowed to make call sites easier. + * Arithmetic in bytes generates better code in GCC. + */ + + lex_ctx->window = (duk_lexer_codepoint *) (void *) ((duk_uint8_t *) lex_ctx->window + count_bytes); /* avoid multiply */ + used_bytes = (duk_small_uint_t) ((duk_uint8_t *) lex_ctx->window - (duk_uint8_t *) lex_ctx->buffer); + avail_bytes = DUK_LEXER_BUFFER_SIZE * sizeof(duk_lexer_codepoint) - used_bytes; + if (avail_bytes < (duk_small_uint_t) (DUK_LEXER_WINDOW_SIZE * sizeof(duk_lexer_codepoint))) { + /* Not enough data to provide a full window, so "scroll" window to + * start of buffer and fill up the rest. + */ + duk_memmove((void *) lex_ctx->buffer, + (const void *) lex_ctx->window, + (size_t) avail_bytes); + lex_ctx->window = lex_ctx->buffer; + duk__fill_lexer_buffer(lex_ctx, avail_bytes); + } +} + +DUK_LOCAL void duk__init_lexer_window(duk_lexer_ctx *lex_ctx) { + lex_ctx->window = lex_ctx->buffer; + duk__fill_lexer_buffer(lex_ctx, 0); +} +#else /* DUK_USE_LEXER_SLIDING_WINDOW */ +DUK_LOCAL duk_codepoint_t duk__read_char(duk_lexer_ctx *lex_ctx) { + duk_ucodepoint_t x; + duk_small_uint_t len; + duk_small_uint_t i; + const duk_uint8_t *p; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + duk_ucodepoint_t mincp; +#endif + duk_size_t input_offset; + + input_offset = lex_ctx->input_offset; + if (DUK_UNLIKELY(input_offset >= lex_ctx->input_length)) { + /* If input_offset were assigned a negative value, it would + * result in a large positive value. Most likely it would be + * larger than input_length and be caught here. In any case + * no memory unsafe behavior would happen. + */ + return -1; + } + + p = lex_ctx->input + input_offset; + x = (duk_ucodepoint_t) (*p); + + if (DUK_LIKELY(x < 0x80UL)) { + /* 0xxx xxxx -> fast path */ + + /* input offset tracking */ + lex_ctx->input_offset++; + + DUK_ASSERT(x != 0x2028UL && x != 0x2029UL); /* not LS/PS */ + if (DUK_UNLIKELY(x <= 0x000dUL)) { + if ((x == 0x000aUL) || + ((x == 0x000dUL) && (lex_ctx->input_offset >= lex_ctx->input_length || + lex_ctx->input[lex_ctx->input_offset] != 0x000aUL))) { + /* lookup for 0x000a above assumes shortest encoding now */ + + /* E5 Section 7.3, treat the following as newlines: + * LF + * CR [not followed by LF] + * LS + * PS + * + * For CR LF, CR is ignored if it is followed by LF, and the LF will bump + * the line number. + */ + lex_ctx->input_line++; + } + } + + return (duk_codepoint_t) x; + } + + /* Slow path. */ + + if (x < 0xc0UL) { + /* 10xx xxxx -> invalid */ + goto error_encoding; + } else if (x < 0xe0UL) { + /* 110x xxxx 10xx xxxx */ + len = 2; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + mincp = 0x80UL; +#endif + x = x & 0x1fUL; + } else if (x < 0xf0UL) { + /* 1110 xxxx 10xx xxxx 10xx xxxx */ + len = 3; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + mincp = 0x800UL; +#endif + x = x & 0x0fUL; + } else if (x < 0xf8UL) { + /* 1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx */ + len = 4; +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + mincp = 0x10000UL; +#endif + x = x & 0x07UL; + } else { + /* no point in supporting encodings of 5 or more bytes */ + goto error_encoding; + } + + DUK_ASSERT(lex_ctx->input_length >= lex_ctx->input_offset); + if ((duk_size_t) len > (duk_size_t) (lex_ctx->input_length - lex_ctx->input_offset)) { + goto error_clipped; + } + + p++; + for (i = 1; i < len; i++) { + duk_small_uint_t y; + y = *p++; + if ((y & 0xc0U) != 0x80U) { + /* check that byte has the form 10xx xxxx */ + goto error_encoding; + } + x = x << 6; + x += y & 0x3fUL; + } + + /* check final character validity */ + + if (x > 0x10ffffUL) { + goto error_encoding; + } +#if defined(DUK_USE_STRICT_UTF8_SOURCE) + if (x < mincp || (x >= 0xd800UL && x <= 0xdfffUL) || x == 0xfffeUL) { + goto error_encoding; + } +#endif + + /* input offset tracking */ + lex_ctx->input_offset += len; + + /* line tracking */ + DUK_ASSERT(x != 0x000aUL && x != 0x000dUL); + if ((x == 0x2028UL) || (x == 0x2029UL)) { + lex_ctx->input_line++; + } + + return (duk_codepoint_t) x; + + error_clipped: /* clipped codepoint */ + error_encoding: /* invalid codepoint encoding or codepoint */ + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_SOURCE_DECODE_FAILED); + DUK_WO_NORETURN(return 0;); +} + +DUK_LOCAL void duk__advance_bytes(duk_lexer_ctx *lex_ctx, duk_small_uint_t count_bytes) { + duk_small_uint_t keep_bytes; + duk_lexer_codepoint *cp, *cp_end; + + DUK_ASSERT_DISABLE(count_bytes >= 0); /* unsigned */ + DUK_ASSERT(count_bytes <= (duk_small_uint_t) (DUK_LEXER_WINDOW_SIZE * sizeof(duk_lexer_codepoint))); + + /* Zero 'count' is also allowed to make call sites easier. */ + + keep_bytes = DUK_LEXER_WINDOW_SIZE * sizeof(duk_lexer_codepoint) - count_bytes; + duk_memmove((void *) lex_ctx->window, + (const void *) ((duk_uint8_t *) lex_ctx->window + count_bytes), + (size_t) keep_bytes); + + cp = (duk_lexer_codepoint *) ((duk_uint8_t *) lex_ctx->window + keep_bytes); + cp_end = lex_ctx->window + DUK_LEXER_WINDOW_SIZE; + for (; cp != cp_end; cp++) { + cp->offset = lex_ctx->input_offset; + cp->line = lex_ctx->input_line; + cp->codepoint = duk__read_char(lex_ctx); + } +} + +DUK_LOCAL void duk__init_lexer_window(duk_lexer_ctx *lex_ctx) { + /* Call with count == DUK_LEXER_WINDOW_SIZE to fill buffer initially. */ + duk__advance_bytes(lex_ctx, DUK_LEXER_WINDOW_SIZE * sizeof(duk_lexer_codepoint)); /* fill window */ +} +#endif /* DUK_USE_LEXER_SLIDING_WINDOW */ + +DUK_LOCAL void duk__advance_chars(duk_lexer_ctx *lex_ctx, duk_small_uint_t count_chars) { + duk__advance_bytes(lex_ctx, count_chars * sizeof(duk_lexer_codepoint)); +} + +/* + * (Re)initialize the temporary byte buffer. May be called extra times + * with little impact. + */ + +DUK_LOCAL void duk__initbuffer(duk_lexer_ctx *lex_ctx) { + /* Reuse buffer as is unless buffer has grown large. */ + if (DUK_HBUFFER_DYNAMIC_GET_SIZE(lex_ctx->buf) < DUK_LEXER_TEMP_BUF_LIMIT) { + /* Keep current size */ + } else { + duk_hbuffer_resize(lex_ctx->thr, lex_ctx->buf, DUK_LEXER_TEMP_BUF_LIMIT); + } + + DUK_BW_INIT_WITHBUF(lex_ctx->thr, &lex_ctx->bw, lex_ctx->buf); +} + +/* + * Append a Unicode codepoint to the temporary byte buffer. Performs + * CESU-8 surrogate pair encoding for codepoints above the BMP. + * Existing surrogate pairs are allowed and also encoded into CESU-8. + */ + +DUK_LOCAL void duk__appendbuffer(duk_lexer_ctx *lex_ctx, duk_codepoint_t x) { + /* + * Since character data is only generated by decoding the source or by + * the compiler itself, we rely on the input codepoints being correct + * and avoid a check here. + * + * Character data can also come here through decoding of Unicode + * escapes ("\udead\ubeef") so all 16-but unsigned values can be + * present, even when the source file itself is strict UTF-8. + */ + DUK_ASSERT(x >= 0 && x <= 0x10ffffL); + + DUK_BW_WRITE_ENSURE_CESU8(lex_ctx->thr, &lex_ctx->bw, (duk_ucodepoint_t) x); +} + +DUK_LOCAL void duk__appendbuffer_ascii(duk_lexer_ctx *lex_ctx, duk_codepoint_t x) { + /* ASCII characters can be emitted as a single byte without encoding + * which matters for some fast paths. + */ + DUK_ASSERT(x >= 0 && x <= 0x7f); + + DUK_BW_WRITE_ENSURE_U8(lex_ctx->thr, &lex_ctx->bw, (duk_uint8_t) x); +} + +/* + * Intern the temporary byte buffer into a valstack slot + * (in practice, slot1 or slot2). + */ + +DUK_LOCAL duk_hstring *duk__internbuffer(duk_lexer_ctx *lex_ctx, duk_idx_t valstack_idx) { + DUK_ASSERT(valstack_idx == lex_ctx->slot1_idx || valstack_idx == lex_ctx->slot2_idx); + + DUK_BW_PUSH_AS_STRING(lex_ctx->thr, &lex_ctx->bw); + duk_replace(lex_ctx->thr, valstack_idx); + return duk_known_hstring(lex_ctx->thr, valstack_idx); +} + +/* + * Init lexer context + */ + +DUK_INTERNAL void duk_lexer_initctx(duk_lexer_ctx *lex_ctx) { + DUK_ASSERT(lex_ctx != NULL); + + duk_memzero(lex_ctx, sizeof(*lex_ctx)); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) +#if defined(DUK_USE_LEXER_SLIDING_WINDOW) + lex_ctx->window = NULL; +#endif + lex_ctx->thr = NULL; + lex_ctx->input = NULL; + lex_ctx->buf = NULL; +#endif +} + +/* + * Set lexer input position and reinitialize lookup window. + */ + +DUK_INTERNAL void duk_lexer_getpoint(duk_lexer_ctx *lex_ctx, duk_lexer_point *pt) { + pt->offset = lex_ctx->window[0].offset; + pt->line = lex_ctx->window[0].line; +} + +DUK_INTERNAL void duk_lexer_setpoint(duk_lexer_ctx *lex_ctx, duk_lexer_point *pt) { + DUK_ASSERT_DISABLE(pt->offset >= 0); /* unsigned */ + DUK_ASSERT(pt->line >= 1); + lex_ctx->input_offset = pt->offset; + lex_ctx->input_line = pt->line; + duk__init_lexer_window(lex_ctx); +} + +/* + * Lexing helpers + */ + +/* Numeric value of a hex digit (also covers octal and decimal digits) or + * -1 if not a valid hex digit. + */ +DUK_LOCAL duk_codepoint_t duk__hexval_validate(duk_codepoint_t x) { + duk_small_int_t t; + + /* Here 'x' is a Unicode codepoint */ + if (DUK_LIKELY(x >= 0 && x <= 0xff)) { + t = duk_hex_dectab[x]; + if (DUK_LIKELY(t >= 0)) { + return t; + } + } + + return -1; +} + +/* Just a wrapper for call sites where 'x' is known to be valid so + * we assert for it before decoding. + */ +DUK_LOCAL duk_codepoint_t duk__hexval(duk_codepoint_t x) { + duk_codepoint_t ret; + + DUK_ASSERT((x >= DUK_ASC_0 && x <= DUK_ASC_9) || + (x >= DUK_ASC_LC_A && x <= DUK_ASC_LC_F) || + (x >= DUK_ASC_UC_A && x <= DUK_ASC_UC_F)); + ret = duk__hexval_validate(x); + DUK_ASSERT(ret >= 0 && ret <= 15); + return ret; +} + +/* having this as a separate function provided a size benefit */ +DUK_LOCAL duk_bool_t duk__is_hex_digit(duk_codepoint_t x) { + if (DUK_LIKELY(x >= 0 && x <= 0xff)) { + return (duk_hex_dectab[x] >= 0); + } + return 0; +} + +/* Parse a Unicode escape of the form \xHH, \uHHHH, or \u{H+}. Shared by + * source and RegExp parsing. + */ +DUK_LOCAL duk_codepoint_t duk__lexer_parse_escape(duk_lexer_ctx *lex_ctx, duk_bool_t allow_es6) { + duk_small_int_t digits; /* Initial value 2 or 4 for fixed length escapes, 0 for ES2015 \u{H+}. */ + duk_codepoint_t escval; + duk_codepoint_t x; + duk_small_uint_t adv; + + DUK_ASSERT(DUK__L0() == DUK_ASC_BACKSLASH); /* caller responsibilities */ + DUK_ASSERT(DUK__L1() == DUK_ASC_LC_X || DUK__L1() == DUK_ASC_LC_U); + DUK_UNREF(allow_es6); + + adv = 2; + digits = 2; + if (DUK__L1() == DUK_ASC_LC_U) { + digits = 4; +#if defined(DUK_USE_ES6_UNICODE_ESCAPE) + if (DUK__L2() == DUK_ASC_LCURLY && allow_es6) { + digits = 0; + adv = 3; + } +#endif + } + DUK__ADVANCECHARS(lex_ctx, adv); + + escval = 0; + for (;;) { + /* One of the escape forms: \xHH, \uHHHH, \u{H+}. + * The 'digits' variable tracks parsing state and is + * initialized to: + * + * \xHH 2 + * \uHH 4 + * \u{H+} 0 first time, updated to -1 to indicate + * at least one digit has been parsed + * + * Octal parsing is handled separately because it can be + * done with fixed lookahead and also has validation + * rules which depend on the escape length (which is + * variable). + * + * We don't need a specific check for x < 0 (end of + * input) or duk_unicode_is_line_terminator(x) + * because the 'dig' decode will fail and lead to a + * SyntaxError. + */ + duk_codepoint_t dig; + + x = DUK__L0(); + DUK__ADVANCECHARS(lex_ctx, 1); + + dig = duk__hexval_validate(x); + if (digits > 0) { + digits--; + if (dig < 0) { + goto fail_escape; + } + DUK_ASSERT(dig >= 0x00 && dig <= 0x0f); + escval = (escval << 4) + dig; + if (digits == 0) { + DUK_ASSERT(escval >= 0 && escval <= 0xffffL); + break; + } + } else { +#if defined(DUK_USE_ES6_UNICODE_ESCAPE) + DUK_ASSERT(digits == 0 /* first time */ || digits == -1 /* others */); + if (dig >= 0) { + DUK_ASSERT(dig >= 0x00 && dig <= 0x0f); + escval = (escval << 4) + dig; + if (escval > 0x10ffffL) { + goto fail_escape; + } + } else if (x == DUK_ASC_RCURLY) { + if (digits == 0) { + /* Empty escape, \u{}. */ + goto fail_escape; + } + DUK_ASSERT(escval >= 0 && escval <= 0x10ffffL); + break; + } else { + goto fail_escape; + } + digits = -1; /* Indicate we have at least one digit. */ +#else /* DUK_USE_ES6_UNICODE_ESCAPE */ + DUK_ASSERT(0); /* Never happens if \u{H+} support disabled. */ +#endif /* DUK_USE_ES6_UNICODE_ESCAPE */ + } + } + + return escval; + + fail_escape: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_ESCAPE); + DUK_WO_NORETURN(return 0;); +} + +/* Parse legacy octal escape of the form \N{1,3}, e.g. \0, \5, \0377. Maximum + * allowed value is \0377 (U+00FF), longest match is used. Used for both string + * RegExp octal escape parsing. Window[0] must be the slash '\' and the first + * digit must already be validated to be in [0-9] by the caller. + */ +DUK_LOCAL duk_codepoint_t duk__lexer_parse_legacy_octal(duk_lexer_ctx *lex_ctx, duk_small_uint_t *out_adv, duk_bool_t reject_annex_b) { + duk_codepoint_t cp; + duk_small_uint_t lookup_idx; + duk_small_uint_t adv; + duk_codepoint_t tmp; + + DUK_ASSERT(out_adv != NULL); + DUK_ASSERT(DUK__LOOKUP(lex_ctx, 0) == DUK_ASC_BACKSLASH); + DUK_ASSERT(DUK__LOOKUP(lex_ctx, 1) >= DUK_ASC_0 && DUK__LOOKUP(lex_ctx, 1) <= DUK_ASC_9); + + cp = 0; + tmp = 0; + for (lookup_idx = 1; lookup_idx <= 3; lookup_idx++) { + DUK_DDD(DUK_DDDPRINT("lookup_idx=%ld, cp=%ld", (long) lookup_idx, (long) cp)); + tmp = DUK__LOOKUP(lex_ctx, lookup_idx); + if (tmp < DUK_ASC_0 || tmp > DUK_ASC_7) { + /* No more valid digits. */ + break; + } + tmp = (cp << 3) + (tmp - DUK_ASC_0); + if (tmp > 0xff) { + /* Three digit octal escapes above \377 (= 0xff) + * are not allowed. + */ + break; + } + cp = tmp; + } + DUK_DDD(DUK_DDDPRINT("final lookup_idx=%ld, cp=%ld", (long) lookup_idx, (long) cp)); + + adv = lookup_idx; + if (lookup_idx == 1) { + DUK_DDD(DUK_DDDPRINT("\\8 or \\9 -> treat as literal, accept in strict mode too")); + DUK_ASSERT(tmp == DUK_ASC_8 || tmp == DUK_ASC_9); + cp = tmp; + adv++; /* correction to above, eat offending character */ + } else if (lookup_idx == 2 && cp == 0) { + /* Note: 'foo\0bar' is OK in strict mode, but 'foo\00bar' is not. + * It won't be interpreted as 'foo\u{0}0bar' but as a SyntaxError. + */ + DUK_DDD(DUK_DDDPRINT("\\0 -> accept in strict mode too")); + } else { + /* This clause also handles non-shortest zero, e.g. \00. */ + if (reject_annex_b) { + DUK_DDD(DUK_DDDPRINT("non-zero octal literal %ld -> reject in strict-mode", (long) cp)); + cp = -1; + } else { + DUK_DDD(DUK_DDDPRINT("non-zero octal literal %ld -> accepted", (long) cp)); + DUK_ASSERT(cp >= 0 && cp <= 0xff); + } + } + + *out_adv = adv; + + DUK_ASSERT((cp >= 0 && cp <= 0xff) || (cp == -1 && reject_annex_b)); + return cp; +} + +/* XXX: move strict mode to lex_ctx? */ +DUK_LOCAL void duk__lexer_parse_string_literal(duk_lexer_ctx *lex_ctx, duk_token *out_token, duk_small_int_t quote, duk_bool_t strict_mode) { + duk_small_uint_t adv; + + for (adv = 1 /* initial quote */ ;;) { + duk_codepoint_t x; + + DUK__ADVANCECHARS(lex_ctx, adv); /* eat opening quote on first loop */ + x = DUK__L0(); + + adv = 1; + if (x == quote) { + DUK__ADVANCECHARS(lex_ctx, 1); /* eat closing quote */ + break; + } else if (x == '\\') { + /* DUK__L0 -> '\' char + * DUK__L1 ... DUK__L5 -> more lookup + */ + duk_small_int_t emitcp = -1; + + x = DUK__L1(); + + /* How much to advance before next loop. */ + adv = 2; /* note: long live range */ + + switch (x) { + case '\'': + emitcp = 0x0027; + break; + case '"': + emitcp = 0x0022; + break; + case '\\': + emitcp = 0x005c; + break; + case 'b': + emitcp = 0x0008; + break; + case 'f': + emitcp = 0x000c; + break; + case 'n': + emitcp = 0x000a; + break; + case 'r': + emitcp = 0x000d; + break; + case 't': + emitcp = 0x0009; + break; + case 'v': + emitcp = 0x000b; + break; + case 'x': + case 'u': { + duk_codepoint_t esc_cp; + esc_cp = duk__lexer_parse_escape(lex_ctx, 1 /*allow_es6*/); + DUK__APPENDBUFFER(lex_ctx, esc_cp); + adv = 0; + break; + } + default: { + if (duk_unicode_is_line_terminator(x)) { + /* line continuation */ + if (x == 0x000d && DUK__L2() == 0x000a) { + /* CR LF again a special case */ + adv = 3; /* line terminator, CR, LF */ + } + } else if (DUK__ISDIGIT(x)) { + /* + * Octal escape or zero escape: + * \0 (lookahead not OctalDigit) + * \1 ... \7 (lookahead not OctalDigit) + * \ZeroToThree OctalDigit (lookahead not OctalDigit) + * \FourToSeven OctalDigit (no lookahead restrictions) + * \ZeroToThree OctalDigit OctalDigit (no lookahead restrictions) + * + * Zero escape is part of the standard syntax. Octal escapes are + * defined in E5 Section B.1.2, and are only allowed in non-strict mode. + * Any other productions starting with a decimal digit are invalid + * but are in practice treated like identity escapes. + * + * Parse octal (up to 3 digits) from the lookup window. + */ + + emitcp = duk__lexer_parse_legacy_octal(lex_ctx, &adv, strict_mode /*reject_annex_b*/); + if (emitcp < 0) { + goto fail_escape; + } + } else if (x < 0) { + goto fail_unterminated; + } else { + /* escaped NonEscapeCharacter */ + DUK__APPENDBUFFER(lex_ctx, x); + } + } /* end default clause */ + } /* end switch */ + + /* Shared handling for single codepoint escapes. */ + if (emitcp >= 0) { + DUK__APPENDBUFFER(lex_ctx, emitcp); + } + + /* Track number of escapes; count not really needed but directive + * prologues need to detect whether there were any escapes or line + * continuations or not. + */ + out_token->num_escapes++; + } else if (x >= 0x20 && x <= 0x7f) { + /* Fast path for ASCII case, avoids line terminator + * check and CESU-8 encoding. + */ + DUK_ASSERT(x >= 0); + DUK_ASSERT(!duk_unicode_is_line_terminator(x)); + DUK_ASSERT(x != quote); + DUK_ASSERT(x != DUK_ASC_BACKSLASH); + DUK__APPENDBUFFER_ASCII(lex_ctx, x); + } else if (x < 0 || duk_unicode_is_line_terminator(x)) { + goto fail_unterminated; + } else { + /* Character which is part of the string but wasn't handled + * by the fast path. + */ + DUK__APPENDBUFFER(lex_ctx, x); + } + } /* string parse loop */ + + return; + + fail_escape: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_ESCAPE); + DUK_WO_NORETURN(return;); + + fail_unterminated: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_UNTERMINATED_STRING); + DUK_WO_NORETURN(return;); +} + +/* Skip to end-of-line (or end-of-file), used for single line comments. */ +DUK_LOCAL void duk__lexer_skip_to_endofline(duk_lexer_ctx *lex_ctx) { + for (;;) { + duk_codepoint_t x; + + x = DUK__L0(); + if (x < 0 || duk_unicode_is_line_terminator(x)) { + break; + } + DUK__ADVANCECHARS(lex_ctx, 1); + } +} + +/* + * Parse ECMAScript source InputElementDiv or InputElementRegExp + * (E5 Section 7), skipping whitespace, comments, and line terminators. + * + * Possible results are: + * (1) a token + * (2) a line terminator (skipped) + * (3) a comment (skipped) + * (4) EOF + * + * White space is automatically skipped from the current position (but + * not after the input element). If input has already ended, returns + * DUK_TOK_EOF indefinitely. If a parse error occurs, uses an DUK_ERROR() + * macro call (and hence a longjmp through current heap longjmp context). + * Comments and line terminator tokens are automatically skipped. + * + * The input element being matched is determined by regexp_mode; if set, + * parses a InputElementRegExp, otherwise a InputElementDiv. The + * difference between these are handling of productions starting with a + * forward slash. + * + * If strict_mode is set, recognizes additional future reserved words + * specific to strict mode, and refuses to parse octal literals. + * + * The matching strategy below is to (currently) use a six character + * lookup window to quickly determine which production is the -longest- + * matching one, and then parse that. The top-level if-else clauses + * match the first character, and the code blocks for each clause + * handle -all- alternatives for that first character. ECMAScript + * specification uses the "longest match wins" semantics, so the order + * of the if-clauses matters. + * + * Misc notes: + * + * * ECMAScript numeric literals do not accept a sign character. + * Consequently e.g. "-1.0" is parsed as two tokens: a negative + * sign and a positive numeric literal. The compiler performs + * the negation during compilation, so this has no adverse impact. + * + * * There is no token for "undefined": it is just a value available + * from the global object (or simply established by doing a reference + * to an undefined value). + * + * * Some contexts want Identifier tokens, which are IdentifierNames + * excluding reserved words, while some contexts want IdentifierNames + * directly. In the latter case e.g. "while" is interpreted as an + * identifier name, not a DUK_TOK_WHILE token. The solution here is + * to provide both token types: DUK_TOK_WHILE goes to 't' while + * DUK_TOK_IDENTIFIER goes to 't_nores', and 'slot1' always contains + * the identifier / keyword name. + * + * * Directive prologue needs to identify string literals such as + * "use strict" and 'use strict', which are sensitive to line + * continuations and escape sequences. For instance, "use\u0020strict" + * is a valid directive but is distinct from "use strict". The solution + * here is to decode escapes while tokenizing, but to keep track of the + * number of escapes. Directive detection can then check that the + * number of escapes is zero. + * + * * Multi-line comments with one or more internal LineTerminator are + * treated like a line terminator to comply with automatic semicolon + * insertion. + */ + +DUK_INTERNAL +void duk_lexer_parse_js_input_element(duk_lexer_ctx *lex_ctx, + duk_token *out_token, + duk_bool_t strict_mode, + duk_bool_t regexp_mode) { + duk_codepoint_t x; /* temporary, must be signed and 32-bit to hold Unicode code points */ + duk_small_uint_t advtok = 0; /* (advance << 8) + token_type, updated at function end, + * init is unnecessary but suppresses "may be used uninitialized" warnings. + */ + duk_bool_t got_lineterm = 0; /* got lineterm preceding non-whitespace, non-lineterm token */ + + if (++lex_ctx->token_count >= lex_ctx->token_limit) { + goto fail_token_limit; + } + + out_token->t = DUK_TOK_EOF; + out_token->t_nores = DUK_TOK_INVALID; /* marker: copy t if not changed */ +#if 0 /* not necessary to init, disabled for faster parsing */ + out_token->num = DUK_DOUBLE_NAN; + out_token->str1 = NULL; + out_token->str2 = NULL; +#endif + out_token->num_escapes = 0; + /* out_token->lineterm set by caller */ + + /* This would be nice, but parsing is faster without resetting the + * value slots. The only side effect is that references to temporary + * string values may linger until lexing is finished; they're then + * freed normally. + */ +#if 0 + duk_to_undefined(lex_ctx->thr, lex_ctx->slot1_idx); + duk_to_undefined(lex_ctx->thr, lex_ctx->slot2_idx); +#endif + + /* 'advtok' indicates how much to advance and which token id to assign + * at the end. This shared functionality minimizes code size. All + * code paths are required to set 'advtok' to some value, so no default + * init value is used. Code paths calling DUK_ERROR() never return so + * they don't need to set advtok. + */ + + /* + * Matching order: + * + * Punctuator first chars, also covers comments, regexps + * LineTerminator + * Identifier or reserved word, also covers null/true/false literals + * NumericLiteral + * StringLiteral + * EOF + * + * The order does not matter as long as the longest match is + * always correctly identified. There are order dependencies + * in the clauses, so it's not trivial to convert to a switch. + */ + + restart_lineupdate: + out_token->start_line = lex_ctx->window[0].line; + + restart: + out_token->start_offset = lex_ctx->window[0].offset; + + x = DUK__L0(); + + switch (x) { + case DUK_ASC_SPACE: + case DUK_ASC_HT: /* fast paths for space and tab */ + DUK__ADVANCECHARS(lex_ctx, 1); + goto restart; + case DUK_ASC_LF: /* LF line terminator; CR LF and Unicode lineterms are handled in slow path */ + DUK__ADVANCECHARS(lex_ctx, 1); + got_lineterm = 1; + goto restart_lineupdate; +#if defined(DUK_USE_SHEBANG_COMMENTS) + case DUK_ASC_HASH: /* '#' */ + if (DUK__L1() == DUK_ASC_EXCLAMATION && lex_ctx->window[0].offset == 0 && + (lex_ctx->flags & DUK_COMPILE_SHEBANG)) { + /* "Shebang" comment ('#! ...') on first line. */ + /* DUK__ADVANCECHARS(lex_ctx, 2) would be correct here, but not necessary */ + duk__lexer_skip_to_endofline(lex_ctx); + goto restart; /* line terminator will be handled on next round */ + } + goto fail_token; +#endif /* DUK_USE_SHEBANG_COMMENTS */ + case DUK_ASC_SLASH: /* '/' */ + if (DUK__L1() == DUK_ASC_SLASH) { + /* + * E5 Section 7.4, allow SourceCharacter (which is any 16-bit + * code point). + */ + + /* DUK__ADVANCECHARS(lex_ctx, 2) would be correct here, but not necessary */ + duk__lexer_skip_to_endofline(lex_ctx); + goto restart; /* line terminator will be handled on next round */ + } else if (DUK__L1() == DUK_ASC_STAR) { + /* + * E5 Section 7.4. If the multi-line comment contains a newline, + * it is treated like a single line terminator for automatic + * semicolon insertion. + */ + + duk_bool_t last_asterisk = 0; + DUK__ADVANCECHARS(lex_ctx, 2); + for (;;) { + x = DUK__L0(); + if (x < 0) { + goto fail_unterm_comment; + } + DUK__ADVANCECHARS(lex_ctx, 1); + if (last_asterisk && x == DUK_ASC_SLASH) { + break; + } + if (duk_unicode_is_line_terminator(x)) { + got_lineterm = 1; + } + last_asterisk = (x == DUK_ASC_STAR); + } + goto restart_lineupdate; + } else if (regexp_mode) { +#if defined(DUK_USE_REGEXP_SUPPORT) + /* + * "/" followed by something in regexp mode. See E5 Section 7.8.5. + * + * RegExp parsing is a bit complex. First, the regexp body is delimited + * by forward slashes, but the body may also contain forward slashes as + * part of an escape sequence or inside a character class (delimited by + * square brackets). A mini state machine is used to implement these. + * + * Further, an early (parse time) error must be thrown if the regexp + * would cause a run-time error when used in the expression new RegExp(...). + * Parsing here simply extracts the (candidate) regexp, and also accepts + * invalid regular expressions (which are delimited properly). The caller + * (compiler) must perform final validation and regexp compilation. + * + * RegExp first char may not be '/' (single line comment) or '*' (multi- + * line comment). These have already been checked above, so there is no + * need below for special handling of the first regexp character as in + * the E5 productions. + * + * About unicode escapes within regexp literals: + * + * E5 Section 7.8.5 grammar does NOT accept \uHHHH escapes. + * However, Section 6 states that regexps accept the escapes, + * see paragraph starting with "In string literals...". + * The regexp grammar, which sees the decoded regexp literal + * (after lexical parsing) DOES have a \uHHHH unicode escape. + * So, for instance: + * + * /\u1234/ + * + * should first be parsed by the lexical grammar as: + * + * '\' 'u' RegularExpressionBackslashSequence + * '1' RegularExpressionNonTerminator + * '2' RegularExpressionNonTerminator + * '3' RegularExpressionNonTerminator + * '4' RegularExpressionNonTerminator + * + * and the escape itself is then parsed by the regexp engine. + * This is the current implementation. + * + * Minor spec inconsistency: + * + * E5 Section 7.8.5 RegularExpressionBackslashSequence is: + * + * \ RegularExpressionNonTerminator + * + * while Section A.1 RegularExpressionBackslashSequence is: + * + * \ NonTerminator + * + * The latter is not normative and a typo. + * + */ + + /* first, parse regexp body roughly */ + + duk_small_int_t state = 0; /* 0=base, 1=esc, 2=class, 3=class+esc */ + + DUK__INITBUFFER(lex_ctx); + for (;;) { + DUK__ADVANCECHARS(lex_ctx, 1); /* skip opening slash on first loop */ + x = DUK__L0(); + if (x < 0 || duk_unicode_is_line_terminator(x)) { + goto fail_unterm_regexp; + } + x = DUK__L0(); /* re-read to avoid spill / fetch */ + if (state == 0) { + if (x == DUK_ASC_SLASH) { + DUK__ADVANCECHARS(lex_ctx, 1); /* eat closing slash */ + break; + } else if (x == DUK_ASC_BACKSLASH) { + state = 1; + } else if (x == DUK_ASC_LBRACKET) { + state = 2; + } + } else if (state == 1) { + state = 0; + } else if (state == 2) { + if (x == DUK_ASC_RBRACKET) { + state = 0; + } else if (x == DUK_ASC_BACKSLASH) { + state = 3; + } + } else { /* state == 3 */ + state = 2; + } + DUK__APPENDBUFFER(lex_ctx, x); + } + out_token->str1 = duk__internbuffer(lex_ctx, lex_ctx->slot1_idx); + + /* second, parse flags */ + + DUK__INITBUFFER(lex_ctx); + for (;;) { + x = DUK__L0(); + if (!duk_unicode_is_identifier_part(x)) { + break; + } + x = DUK__L0(); /* re-read to avoid spill / fetch */ + DUK__APPENDBUFFER(lex_ctx, x); + DUK__ADVANCECHARS(lex_ctx, 1); + } + out_token->str2 = duk__internbuffer(lex_ctx, lex_ctx->slot2_idx); + + DUK__INITBUFFER(lex_ctx); /* free some memory */ + + /* validation of the regexp is caller's responsibility */ + + advtok = DUK__ADVTOK(0, DUK_TOK_REGEXP); +#else /* DUK_USE_REGEXP_SUPPORT */ + goto fail_regexp_support; +#endif /* DUK_USE_REGEXP_SUPPORT */ + } else if (DUK__L1() == DUK_ASC_EQUALS) { + /* "/=" and not in regexp mode */ + advtok = DUK__ADVTOK(2, DUK_TOK_DIV_EQ); + } else { + /* "/" and not in regexp mode */ + advtok = DUK__ADVTOK(1, DUK_TOK_DIV); + } + break; + case DUK_ASC_LCURLY: /* '{' */ + advtok = DUK__ADVTOK(1, DUK_TOK_LCURLY); + break; + case DUK_ASC_RCURLY: /* '}' */ + advtok = DUK__ADVTOK(1, DUK_TOK_RCURLY); + break; + case DUK_ASC_LPAREN: /* '(' */ + advtok = DUK__ADVTOK(1, DUK_TOK_LPAREN); + break; + case DUK_ASC_RPAREN: /* ')' */ + advtok = DUK__ADVTOK(1, DUK_TOK_RPAREN); + break; + case DUK_ASC_LBRACKET: /* '[' */ + advtok = DUK__ADVTOK(1, DUK_TOK_LBRACKET); + break; + case DUK_ASC_RBRACKET: /* ']' */ + advtok = DUK__ADVTOK(1, DUK_TOK_RBRACKET); + break; + case DUK_ASC_PERIOD: /* '.' */ + if (DUK__ISDIGIT(DUK__L1())) { + /* Period followed by a digit can only start DecimalLiteral + * (handled in slow path). We could jump straight into the + * DecimalLiteral handling but should avoid goto to inside + * a block. + */ + goto slow_path; + } + advtok = DUK__ADVTOK(1, DUK_TOK_PERIOD); + break; + case DUK_ASC_SEMICOLON: /* ';' */ + advtok = DUK__ADVTOK(1, DUK_TOK_SEMICOLON); + break; + case DUK_ASC_COMMA: /* ',' */ + advtok = DUK__ADVTOK(1, DUK_TOK_COMMA); + break; + case DUK_ASC_LANGLE: /* '<' */ +#if defined(DUK_USE_HTML_COMMENTS) + if (DUK__L1() == DUK_ASC_EXCLAMATION && DUK__L2() == DUK_ASC_MINUS && DUK__L3() == DUK_ASC_MINUS) { + /* + * ES2015: B.1.3, handle "<!--" SingleLineHTMLOpenComment + */ + + /* DUK__ADVANCECHARS(lex_ctx, 4) would be correct here, but not necessary */ + duk__lexer_skip_to_endofline(lex_ctx); + goto restart; /* line terminator will be handled on next round */ + } + else +#endif /* DUK_USE_HTML_COMMENTS */ + if (DUK__L1() == DUK_ASC_LANGLE && DUK__L2() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(3, DUK_TOK_ALSHIFT_EQ); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_LE); + } else if (DUK__L1() == DUK_ASC_LANGLE) { + advtok = DUK__ADVTOK(2, DUK_TOK_ALSHIFT); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_LT); + } + break; + case DUK_ASC_RANGLE: /* '>' */ + if (DUK__L1() == DUK_ASC_RANGLE && DUK__L2() == DUK_ASC_RANGLE && DUK__L3() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(4, DUK_TOK_RSHIFT_EQ); + } else if (DUK__L1() == DUK_ASC_RANGLE && DUK__L2() == DUK_ASC_RANGLE) { + advtok = DUK__ADVTOK(3, DUK_TOK_RSHIFT); + } else if (DUK__L1() == DUK_ASC_RANGLE && DUK__L2() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(3, DUK_TOK_ARSHIFT_EQ); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_GE); + } else if (DUK__L1() == DUK_ASC_RANGLE) { + advtok = DUK__ADVTOK(2, DUK_TOK_ARSHIFT); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_GT); + } + break; + case DUK_ASC_EQUALS: /* '=' */ + if (DUK__L1() == DUK_ASC_EQUALS && DUK__L2() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(3, DUK_TOK_SEQ); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_EQUALSIGN); + } + break; + case DUK_ASC_EXCLAMATION: /* '!' */ + if (DUK__L1() == DUK_ASC_EQUALS && DUK__L2() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(3, DUK_TOK_SNEQ); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_NEQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_LNOT); + } + break; + case DUK_ASC_PLUS: /* '+' */ + if (DUK__L1() == DUK_ASC_PLUS) { + advtok = DUK__ADVTOK(2, DUK_TOK_INCREMENT); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_ADD_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_ADD); + } + break; + case DUK_ASC_MINUS: /* '-' */ +#if defined(DUK_USE_HTML_COMMENTS) + if (got_lineterm && DUK__L1() == DUK_ASC_MINUS && DUK__L2() == DUK_ASC_RANGLE) { + /* + * ES2015: B.1.3, handle "-->" SingleLineHTMLCloseComment + * Only allowed: + * - on new line + * - preceded only by whitespace + * - preceded by end of multiline comment and optional whitespace + * + * Since whitespace generates no tokens, and multiline comments + * are treated as a line ending, consulting `got_lineterm` is + * sufficient to test for these three options. + */ + + /* DUK__ADVANCECHARS(lex_ctx, 3) would be correct here, but not necessary */ + duk__lexer_skip_to_endofline(lex_ctx); + goto restart; /* line terminator will be handled on next round */ + } else +#endif /* DUK_USE_HTML_COMMENTS */ + if (DUK__L1() == DUK_ASC_MINUS) { + advtok = DUK__ADVTOK(2, DUK_TOK_DECREMENT); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_SUB_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_SUB); + } + break; + case DUK_ASC_STAR: /* '*' */ +#if defined(DUK_USE_ES7_EXP_OPERATOR) + if (DUK__L1() == DUK_ASC_STAR && DUK__L2() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(3, DUK_TOK_EXP_EQ); + } else if (DUK__L1() == DUK_ASC_STAR) { + advtok = DUK__ADVTOK(2, DUK_TOK_EXP); + } else +#endif + if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_MUL_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_MUL); + } + break; + case DUK_ASC_PERCENT: /* '%' */ + if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_MOD_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_MOD); + } + break; + case DUK_ASC_AMP: /* '&' */ + if (DUK__L1() == DUK_ASC_AMP) { + advtok = DUK__ADVTOK(2, DUK_TOK_LAND); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_BAND_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_BAND); + } + break; + case DUK_ASC_PIPE: /* '|' */ + if (DUK__L1() == DUK_ASC_PIPE) { + advtok = DUK__ADVTOK(2, DUK_TOK_LOR); + } else if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_BOR_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_BOR); + } + break; + case DUK_ASC_CARET: /* '^' */ + if (DUK__L1() == DUK_ASC_EQUALS) { + advtok = DUK__ADVTOK(2, DUK_TOK_BXOR_EQ); + } else { + advtok = DUK__ADVTOK(1, DUK_TOK_BXOR); + } + break; + case DUK_ASC_TILDE: /* '~' */ + advtok = DUK__ADVTOK(1, DUK_TOK_BNOT); + break; + case DUK_ASC_QUESTION: /* '?' */ + advtok = DUK__ADVTOK(1, DUK_TOK_QUESTION); + break; + case DUK_ASC_COLON: /* ':' */ + advtok = DUK__ADVTOK(1, DUK_TOK_COLON); + break; + case DUK_ASC_DOUBLEQUOTE: /* '"' */ + case DUK_ASC_SINGLEQUOTE: { /* '\'' */ + DUK__INITBUFFER(lex_ctx); + duk__lexer_parse_string_literal(lex_ctx, out_token, x /*quote*/, strict_mode); + duk__internbuffer(lex_ctx, lex_ctx->slot1_idx); + out_token->str1 = duk_known_hstring(lex_ctx->thr, lex_ctx->slot1_idx); + + DUK__INITBUFFER(lex_ctx); /* free some memory */ + + advtok = DUK__ADVTOK(0, DUK_TOK_STRING); + break; + } + default: + goto slow_path; + } /* switch */ + + goto skip_slow_path; + + slow_path: + if (duk_unicode_is_line_terminator(x)) { + if (x == 0x000d && DUK__L1() == 0x000a) { + /* + * E5 Section 7.3: CR LF is detected as a single line terminator for + * line numbers. Here we also detect it as a single line terminator + * token. + */ + DUK__ADVANCECHARS(lex_ctx, 2); + } else { + DUK__ADVANCECHARS(lex_ctx, 1); + } + got_lineterm = 1; + goto restart_lineupdate; + } else if (duk_unicode_is_identifier_start(x) || x == DUK_ASC_BACKSLASH) { + /* + * Parse an identifier and then check whether it is: + * - reserved word (keyword or other reserved word) + * - "null" (NullLiteral) + * - "true" (BooleanLiteral) + * - "false" (BooleanLiteral) + * - anything else => identifier + * + * This does not follow the E5 productions cleanly, but is + * useful and compact. + * + * Note that identifiers may contain Unicode escapes, + * see E5 Sections 6 and 7.6. They must be decoded first, + * and the result checked against allowed characters. + * The above if-clause accepts an identifier start and an + * '\' character -- no other token can begin with a '\'. + * + * Note that "get" and "set" are not reserved words in E5 + * specification so they are recognized as plain identifiers + * (the tokens DUK_TOK_GET and DUK_TOK_SET are actually not + * used now). The compiler needs to work around this. + * + * Strictly speaking, following ECMAScript longest match + * specification, an invalid escape for the first character + * should cause a syntax error. However, an invalid escape + * for IdentifierParts should just terminate the identifier + * early (longest match), and let the next tokenization + * fail. For instance Rhino croaks with 'foo\z' when + * parsing the identifier. This has little practical impact. + */ + + duk_small_uint_t i, i_end; + duk_bool_t first = 1; + duk_hstring *str; + + DUK__INITBUFFER(lex_ctx); + for (;;) { + /* re-lookup first char on first loop */ + if (DUK__L0() == DUK_ASC_BACKSLASH) { + duk_codepoint_t esc_cp; + if (DUK__L1() != DUK_ASC_LC_U) { + goto fail_escape; + } + esc_cp = duk__lexer_parse_escape(lex_ctx, 1 /*allow_es6*/); + DUK__APPENDBUFFER(lex_ctx, esc_cp); + + /* IdentifierStart is stricter than IdentifierPart, so if the first + * character is escaped, must have a stricter check here. + */ + if (!(first ? duk_unicode_is_identifier_start(esc_cp) : duk_unicode_is_identifier_part(esc_cp))) { + goto fail_escape; + } + + /* Track number of escapes: necessary for proper keyword + * detection. + */ + out_token->num_escapes++; + } else { + /* Note: first character is checked against this. But because + * IdentifierPart includes all IdentifierStart characters, and + * the first character (if unescaped) has already been checked + * in the if condition, this is OK. + */ + if (!duk_unicode_is_identifier_part(DUK__L0())) { + break; + } + DUK__APPENDBUFFER(lex_ctx, DUK__L0()); + DUK__ADVANCECHARS(lex_ctx, 1); + } + first = 0; + } + + out_token->str1 = duk__internbuffer(lex_ctx, lex_ctx->slot1_idx); + str = out_token->str1; + out_token->t_nores = DUK_TOK_IDENTIFIER; + + DUK__INITBUFFER(lex_ctx); /* free some memory */ + + /* + * Interned identifier is compared against reserved words, which are + * currently interned into the heap context. See genbuiltins.py. + * + * Note that an escape in the identifier disables recognition of + * keywords; e.g. "\u0069f = 1;" is a valid statement (assigns to + * identifier named "if"). This is not necessarily compliant, + * see test-dec-escaped-char-in-keyword.js. + * + * Note: "get" and "set" are awkward. They are not officially + * ReservedWords (and indeed e.g. "var set = 1;" is valid), and + * must come out as DUK_TOK_IDENTIFIER. The compiler needs to + * work around this a bit. + */ + + /* XXX: optimize by adding the token numbers directly into the + * always interned duk_hstring objects (there should be enough + * flag bits free for that)? + */ + + i_end = (strict_mode ? DUK_STRIDX_END_RESERVED : DUK_STRIDX_START_STRICT_RESERVED); + + advtok = DUK__ADVTOK(0, DUK_TOK_IDENTIFIER); + if (out_token->num_escapes == 0) { + for (i = DUK_STRIDX_START_RESERVED; i < i_end; i++) { + DUK_ASSERT_DISABLE(i >= 0); /* unsigned */ + DUK_ASSERT(i < DUK_HEAP_NUM_STRINGS); + if (DUK_HTHREAD_GET_STRING(lex_ctx->thr, i) == str) { + advtok = DUK__ADVTOK(0, DUK_STRIDX_TO_TOK(i)); + break; + } + } + } + } else if (DUK__ISDIGIT(x) || (x == DUK_ASC_PERIOD)) { + /* Note: decimal number may start with a period, but must be followed by a digit */ + + /* + * Pre-parsing for decimal, hex, octal (both legacy and ES2015), + * and binary literals, followed by an actual parser step + * provided by numconv. + * + * Note: the leading sign character ('+' or '-') is -not- part of + * the production in E5 grammar, and that the a DecimalLiteral + * starting with a '0' must be followed by a non-digit. + * + * XXX: the two step parsing process is quite awkward, it would + * be more straightforward to allow numconv to parse the longest + * valid prefix (it already does that, it only needs to indicate + * where the input ended). However, the lexer decodes characters + * using a limited lookup window, so this is not a trivial change. + */ + + /* XXX: because of the final check below (that the literal is not + * followed by a digit), this could maybe be simplified, if we bail + * out early from a leading zero (and if there are no periods etc). + * Maybe too complex. + */ + + duk_double_t val; + duk_bool_t legacy_oct = 0; + duk_small_int_t state; /* 0=before period/exp, + * 1=after period, before exp + * 2=after exp, allow '+' or '-' + * 3=after exp and exp sign + */ + duk_small_uint_t s2n_flags; + duk_codepoint_t y, z; + duk_small_int_t s2n_radix = 10; + duk_small_uint_t pre_adv = 0; + + DUK__INITBUFFER(lex_ctx); + y = DUK__L1(); + + if (x == DUK_ASC_0) { + z = DUK_LOWERCASE_CHAR_ASCII(y); + + pre_adv = 2; /* default for 0xNNN, 0oNNN, 0bNNN. */ + if (z == DUK_ASC_LC_X) { + s2n_radix = 16; + } else if (z == DUK_ASC_LC_O) { + s2n_radix = 8; + } else if (z == DUK_ASC_LC_B) { + s2n_radix = 2; + } else { + pre_adv = 0; + if (DUK__ISDIGIT(y)) { + if (strict_mode) { + /* Reject octal like \07 but also octal-lookalike + * decimal like \08 in strict mode. + */ + goto fail_number_literal; + } else { + /* Legacy OctalIntegerLiteral or octal-lookalice + * decimal. Deciding between the two happens below + * in digit scanning. + */ + DUK__APPENDBUFFER(lex_ctx, x); + pre_adv = 1; + legacy_oct = 1; + s2n_radix = 8; /* tentative unless conflicting digits found */ + } + } + } + } + + DUK__ADVANCECHARS(lex_ctx, pre_adv); + + /* XXX: we could parse integers here directly, and fall back + * to numconv only when encountering a fractional expression + * or when an octal literal turned out to be decimal (0778 etc). + */ + state = 0; + for (;;) { + x = DUK__L0(); /* re-lookup curr char on first round */ + if (DUK__ISDIGIT(x)) { + /* Note: intentionally allow leading zeroes here, as the + * actual parser will check for them. + */ + if (state == 0 && legacy_oct && (x == DUK_ASC_8 || x == DUK_ASC_9)) { + /* Started out as an octal-lookalike + * but interpreted as decimal, e.g. + * '0779' -> 779. This also means + * that fractions are allowed, e.g. + * '0779.123' is allowed but '0777.123' + * is not! + */ + s2n_radix = 10; + } + if (state == 2) { + state = 3; + } + } else if (s2n_radix == 16 && DUK__ISHEXDIGIT(x)) { + /* Note: 'e' and 'E' are also accepted here. */ + ; + } else if (x == DUK_ASC_PERIOD) { + if (state >= 1 || s2n_radix != 10) { + break; + } else { + state = 1; + } + } else if (x == DUK_ASC_LC_E || x == DUK_ASC_UC_E) { + if (state >= 2 || s2n_radix != 10) { + break; + } else { + state = 2; + } + } else if (x == DUK_ASC_MINUS || x == DUK_ASC_PLUS) { + if (state != 2) { + break; + } else { + state = 3; + } + } else { + break; + } + DUK__APPENDBUFFER(lex_ctx, x); + DUK__ADVANCECHARS(lex_ctx, 1); + } + + /* XXX: better coercion */ + (void) duk__internbuffer(lex_ctx, lex_ctx->slot1_idx); + + if (s2n_radix != 10) { + /* For bases other than 10, integer only. */ + s2n_flags = DUK_S2N_FLAG_ALLOW_LEADING_ZERO; + } else { + s2n_flags = DUK_S2N_FLAG_ALLOW_EXP | + DUK_S2N_FLAG_ALLOW_FRAC | + DUK_S2N_FLAG_ALLOW_NAKED_FRAC | + DUK_S2N_FLAG_ALLOW_EMPTY_FRAC | + DUK_S2N_FLAG_ALLOW_LEADING_ZERO; + } + + duk_dup(lex_ctx->thr, lex_ctx->slot1_idx); + duk_numconv_parse(lex_ctx->thr, s2n_radix, s2n_flags); + val = duk_to_number_m1(lex_ctx->thr); + if (DUK_ISNAN(val)) { + goto fail_number_literal; + } + duk_replace(lex_ctx->thr, lex_ctx->slot1_idx); /* could also just pop? */ + + DUK__INITBUFFER(lex_ctx); /* free some memory */ + + /* Section 7.8.3 (note): NumericLiteral must be followed by something other than + * IdentifierStart or DecimalDigit. + */ + + if (DUK__ISDIGIT(DUK__L0()) || duk_unicode_is_identifier_start(DUK__L0())) { + goto fail_number_literal; + } + + out_token->num = val; + advtok = DUK__ADVTOK(0, DUK_TOK_NUMBER); + } else if (duk_unicode_is_whitespace(DUK__LOOKUP(lex_ctx, 0))) { + DUK__ADVANCECHARS(lex_ctx, 1); + goto restart; + } else if (x < 0) { + advtok = DUK__ADVTOK(0, DUK_TOK_EOF); + } else { + goto fail_token; + } + skip_slow_path: + + /* + * Shared exit path + */ + + DUK__ADVANCEBYTES(lex_ctx, advtok >> 8); + out_token->t = advtok & 0xff; + if (out_token->t_nores == DUK_TOK_INVALID) { + out_token->t_nores = out_token->t; + } + out_token->lineterm = got_lineterm; + + /* Automatic semicolon insertion is allowed if a token is preceded + * by line terminator(s), or terminates a statement list (right curly + * or EOF). + */ + if (got_lineterm || out_token->t == DUK_TOK_RCURLY || out_token->t == DUK_TOK_EOF) { + out_token->allow_auto_semi = 1; + } else { + out_token->allow_auto_semi = 0; + } + + return; + + fail_token_limit: + DUK_ERROR_RANGE(lex_ctx->thr, DUK_STR_TOKEN_LIMIT); + DUK_WO_NORETURN(return;); + + fail_token: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_TOKEN); + DUK_WO_NORETURN(return;); + + fail_number_literal: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_NUMBER_LITERAL); + DUK_WO_NORETURN(return;); + + fail_escape: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_ESCAPE); + DUK_WO_NORETURN(return;); + + fail_unterm_regexp: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_UNTERMINATED_REGEXP); + DUK_WO_NORETURN(return;); + + fail_unterm_comment: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_UNTERMINATED_COMMENT); + DUK_WO_NORETURN(return;); + +#if !defined(DUK_USE_REGEXP_SUPPORT) + fail_regexp_support: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_REGEXP_SUPPORT_DISABLED); + DUK_WO_NORETURN(return;); +#endif +} + +#if defined(DUK_USE_REGEXP_SUPPORT) + +/* + * Parse a RegExp token. The grammar is described in E5 Section 15.10. + * Terminal constructions (such as quantifiers) are parsed directly here. + * + * 0xffffffffU is used as a marker for "infinity" in quantifiers. Further, + * DUK__MAX_RE_QUANT_DIGITS limits the maximum number of digits that + * will be accepted for a quantifier. + */ + +DUK_INTERNAL void duk_lexer_parse_re_token(duk_lexer_ctx *lex_ctx, duk_re_token *out_token) { + duk_small_uint_t advtok = 0; /* init is unnecessary but suppresses "may be used uninitialized" warnings */ + duk_codepoint_t x, y; + + if (++lex_ctx->token_count >= lex_ctx->token_limit) { + goto fail_token_limit; + } + + duk_memzero(out_token, sizeof(*out_token)); + + x = DUK__L0(); + y = DUK__L1(); + + DUK_DDD(DUK_DDDPRINT("parsing regexp token, L0=%ld, L1=%ld", (long) x, (long) y)); + + switch (x) { + case DUK_ASC_PIPE: { + advtok = DUK__ADVTOK(1, DUK_RETOK_DISJUNCTION); + break; + } + case DUK_ASC_CARET: { + advtok = DUK__ADVTOK(1, DUK_RETOK_ASSERT_START); + break; + } + case DUK_ASC_DOLLAR: { + advtok = DUK__ADVTOK(1, DUK_RETOK_ASSERT_END); + break; + } + case DUK_ASC_QUESTION: { + out_token->qmin = 0; + out_token->qmax = 1; + if (y == DUK_ASC_QUESTION) { + advtok = DUK__ADVTOK(2, DUK_RETOK_QUANTIFIER); + out_token->greedy = 0; + } else { + advtok = DUK__ADVTOK(1, DUK_RETOK_QUANTIFIER); + out_token->greedy = 1; + } + break; + } + case DUK_ASC_STAR: { + out_token->qmin = 0; + out_token->qmax = DUK_RE_QUANTIFIER_INFINITE; + if (y == DUK_ASC_QUESTION) { + advtok = DUK__ADVTOK(2, DUK_RETOK_QUANTIFIER); + out_token->greedy = 0; + } else { + advtok = DUK__ADVTOK(1, DUK_RETOK_QUANTIFIER); + out_token->greedy = 1; + } + break; + } + case DUK_ASC_PLUS: { + out_token->qmin = 1; + out_token->qmax = DUK_RE_QUANTIFIER_INFINITE; + if (y == DUK_ASC_QUESTION) { + advtok = DUK__ADVTOK(2, DUK_RETOK_QUANTIFIER); + out_token->greedy = 0; + } else { + advtok = DUK__ADVTOK(1, DUK_RETOK_QUANTIFIER); + out_token->greedy = 1; + } + break; + } + case DUK_ASC_LCURLY: { + /* Production allows 'DecimalDigits', including leading zeroes */ + duk_uint32_t val1 = 0; + duk_uint32_t val2 = DUK_RE_QUANTIFIER_INFINITE; + duk_small_int_t digits = 0; +#if defined(DUK_USE_ES6_REGEXP_SYNTAX) + duk_lexer_point lex_pt; +#endif + +#if defined(DUK_USE_ES6_REGEXP_SYNTAX) + /* Store lexer position, restoring if quantifier is invalid. */ + DUK_LEXER_GETPOINT(lex_ctx, &lex_pt); +#endif + + for (;;) { + DUK__ADVANCECHARS(lex_ctx, 1); /* eat '{' on entry */ + x = DUK__L0(); + if (DUK__ISDIGIT(x)) { + digits++; + val1 = val1 * 10 + (duk_uint32_t) duk__hexval(x); + } else if (x == DUK_ASC_COMMA) { + if (digits > DUK__MAX_RE_QUANT_DIGITS) { + goto invalid_quantifier; + } + if (val2 != DUK_RE_QUANTIFIER_INFINITE) { + goto invalid_quantifier; + } + if (DUK__L1() == DUK_ASC_RCURLY) { + /* form: { DecimalDigits , }, val1 = min count */ + if (digits == 0) { + goto invalid_quantifier; + } + out_token->qmin = val1; + out_token->qmax = DUK_RE_QUANTIFIER_INFINITE; + DUK__ADVANCECHARS(lex_ctx, 2); + break; + } + val2 = val1; + val1 = 0; + digits = 0; /* not strictly necessary because of lookahead '}' above */ + } else if (x == DUK_ASC_RCURLY) { + if (digits > DUK__MAX_RE_QUANT_DIGITS) { + goto invalid_quantifier; + } + if (digits == 0) { + goto invalid_quantifier; + } + if (val2 != DUK_RE_QUANTIFIER_INFINITE) { + /* val2 = min count, val1 = max count */ + out_token->qmin = val2; + out_token->qmax = val1; + } else { + /* val1 = count */ + out_token->qmin = val1; + out_token->qmax = val1; + } + DUK__ADVANCECHARS(lex_ctx, 1); + break; + } else { + goto invalid_quantifier; + } + } + if (DUK__L0() == DUK_ASC_QUESTION) { + out_token->greedy = 0; + DUK__ADVANCECHARS(lex_ctx, 1); + } else { + out_token->greedy = 1; + } + advtok = DUK__ADVTOK(0, DUK_RETOK_QUANTIFIER); + break; + invalid_quantifier: +#if defined(DUK_USE_ES6_REGEXP_SYNTAX) + /* Failed to match the quantifier, restore lexer and parse + * opening brace as a literal. + */ + DUK_LEXER_SETPOINT(lex_ctx, &lex_pt); + advtok = DUK__ADVTOK(1, DUK_RETOK_ATOM_CHAR); + out_token->num = DUK_ASC_LCURLY; +#else + goto fail_quantifier; +#endif + break; + } + case DUK_ASC_PERIOD: { + advtok = DUK__ADVTOK(1, DUK_RETOK_ATOM_PERIOD); + break; + } + case DUK_ASC_BACKSLASH: { + /* The E5.1 specification does not seem to allow IdentifierPart characters + * to be used as identity escapes. Unfortunately this includes '$', which + * cannot be escaped as '\$'; it needs to be escaped e.g. as '\u0024'. + * Many other implementations (including V8 and Rhino, for instance) do + * accept '\$' as a valid identity escape, which is quite pragmatic, and + * ES2015 Annex B relaxes the rules to allow these (and other) real world forms. + */ + + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_CHAR); /* default: char escape (two chars) */ + if (y == DUK_ASC_LC_B) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ASSERT_WORD_BOUNDARY); + } else if (y == DUK_ASC_UC_B) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ASSERT_NOT_WORD_BOUNDARY); + } else if (y == DUK_ASC_LC_F) { + out_token->num = 0x000c; + } else if (y == DUK_ASC_LC_N) { + out_token->num = 0x000a; + } else if (y == DUK_ASC_LC_T) { + out_token->num = 0x0009; + } else if (y == DUK_ASC_LC_R) { + out_token->num = 0x000d; + } else if (y == DUK_ASC_LC_V) { + out_token->num = 0x000b; + } else if (y == DUK_ASC_LC_C) { + x = DUK__L2(); + if ((x >= DUK_ASC_LC_A && x <= DUK_ASC_LC_Z) || + (x >= DUK_ASC_UC_A && x <= DUK_ASC_UC_Z)) { + out_token->num = (duk_uint32_t) (x % 32); + advtok = DUK__ADVTOK(3, DUK_RETOK_ATOM_CHAR); + } else { + goto fail_escape; + } + } else if (y == DUK_ASC_LC_X || y == DUK_ASC_LC_U) { + /* The token value is the Unicode codepoint without + * it being decode into surrogate pair characters + * here. The \u{H+} is only allowed in Unicode mode + * which we don't support yet. + */ + out_token->num = (duk_uint32_t) duk__lexer_parse_escape(lex_ctx, 0 /*allow_es6*/); + advtok = DUK__ADVTOK(0, DUK_RETOK_ATOM_CHAR); + } else if (y == DUK_ASC_LC_D) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_DIGIT); + } else if (y == DUK_ASC_UC_D) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_NOT_DIGIT); + } else if (y == DUK_ASC_LC_S) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_WHITE); + } else if (y == DUK_ASC_UC_S) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_NOT_WHITE); + } else if (y == DUK_ASC_LC_W) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_WORD_CHAR); + } else if (y == DUK_ASC_UC_W) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_NOT_WORD_CHAR); + } else if (DUK__ISDIGIT(y)) { + /* E5 Section 15.10.2.11 */ + if (y == DUK_ASC_0) { + if (DUK__ISDIGIT(DUK__L2())) { + goto fail_escape; + } + out_token->num = 0x0000; + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_CHAR); + } else { + /* XXX: shared parsing? */ + duk_uint32_t val = 0; + duk_small_int_t i; + for (i = 0; ; i++) { + if (i >= DUK__MAX_RE_DECESC_DIGITS) { + goto fail_escape; + } + DUK__ADVANCECHARS(lex_ctx, 1); /* eat backslash on entry */ + x = DUK__L0(); + if (!DUK__ISDIGIT(x)) { + break; + } + val = val * 10 + (duk_uint32_t) duk__hexval(x); + } + /* DUK__L0() cannot be a digit, because the loop doesn't terminate if it is */ + advtok = DUK__ADVTOK(0, DUK_RETOK_ATOM_BACKREFERENCE); + out_token->num = val; + } +#if defined(DUK_USE_ES6_REGEXP_SYNTAX) + } else if (y >= 0) { + /* For ES2015 Annex B, accept any source character as identity + * escape except 'c' which is used for control characters. + * http://www.ecma-international.org/ecma-262/6.0/#sec-regular-expressions-patterns + * Careful not to match end-of-buffer (<0) here. + * This is not yet full ES2015 Annex B because cases above + * (like hex escape) won't backtrack. + */ + DUK_ASSERT(y != DUK_ASC_LC_C); /* covered above */ +#else /* DUK_USE_ES6_REGEXP_SYNTAX */ + } else if ((y >= 0 && !duk_unicode_is_identifier_part(y)) || + y == DUK_UNICODE_CP_ZWNJ || + y == DUK_UNICODE_CP_ZWJ) { + /* For ES5.1 identity escapes are not allowed for identifier + * parts. This conflicts with a lot of real world code as this + * doesn't e.g. allow escaping a dollar sign as /\$/, see + * test-regexp-identity-escape-dollar.js. + */ +#endif /* DUK_USE_ES6_REGEXP_SYNTAX */ + out_token->num = (duk_uint32_t) y; + } else { + goto fail_escape; + } + break; + } + case DUK_ASC_LPAREN: { + /* XXX: naming is inconsistent: ATOM_END_GROUP ends an ASSERT_START_LOOKAHEAD */ + + if (y == DUK_ASC_QUESTION) { + if (DUK__L2() == DUK_ASC_EQUALS) { + /* (?= */ + advtok = DUK__ADVTOK(3, DUK_RETOK_ASSERT_START_POS_LOOKAHEAD); + } else if (DUK__L2() == DUK_ASC_EXCLAMATION) { + /* (?! */ + advtok = DUK__ADVTOK(3, DUK_RETOK_ASSERT_START_NEG_LOOKAHEAD); + } else if (DUK__L2() == DUK_ASC_COLON) { + /* (?: */ + advtok = DUK__ADVTOK(3, DUK_RETOK_ATOM_START_NONCAPTURE_GROUP); + } else { + goto fail_group; + } + } else { + /* ( */ + advtok = DUK__ADVTOK(1, DUK_RETOK_ATOM_START_CAPTURE_GROUP); + } + break; + } + case DUK_ASC_RPAREN: { + advtok = DUK__ADVTOK(1, DUK_RETOK_ATOM_END_GROUP); + break; + } + case DUK_ASC_LBRACKET: { + /* + * To avoid creating a heavy intermediate value for the list of ranges, + * only the start token ('[' or '[^') is parsed here. The regexp + * compiler parses the ranges itself. + */ + + /* XXX: with DUK_USE_ES6_REGEXP_SYNTAX we should allow left bracket + * literal too, but it's not easy to parse without backtracking. + */ + + advtok = DUK__ADVTOK(1, DUK_RETOK_ATOM_START_CHARCLASS); + if (y == DUK_ASC_CARET) { + advtok = DUK__ADVTOK(2, DUK_RETOK_ATOM_START_CHARCLASS_INVERTED); + } + break; + } +#if !defined(DUK_USE_ES6_REGEXP_SYNTAX) + case DUK_ASC_RCURLY: + case DUK_ASC_RBRACKET: { + /* Although these could be parsed as PatternCharacters unambiguously (here), + * E5 Section 15.10.1 grammar explicitly forbids these as PatternCharacters. + */ + goto fail_invalid_char; + break; + } +#endif + case -1: { + /* EOF */ + advtok = DUK__ADVTOK(0, DUK_TOK_EOF); + break; + } + default: { + /* PatternCharacter, all excluded characters are matched by cases above */ + advtok = DUK__ADVTOK(1, DUK_RETOK_ATOM_CHAR); + out_token->num = (duk_uint32_t) x; + break; + } + } + + /* + * Shared exit path + */ + + DUK__ADVANCEBYTES(lex_ctx, advtok >> 8); + out_token->t = advtok & 0xff; + return; + + fail_token_limit: + DUK_ERROR_RANGE(lex_ctx->thr, DUK_STR_TOKEN_LIMIT); + DUK_WO_NORETURN(return;); + + fail_escape: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_REGEXP_ESCAPE); + DUK_WO_NORETURN(return;); + + fail_group: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_REGEXP_GROUP); + DUK_WO_NORETURN(return;); + +#if !defined(DUK_USE_ES6_REGEXP_SYNTAX) + fail_invalid_char: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_REGEXP_CHARACTER); + DUK_WO_NORETURN(return;); + + fail_quantifier: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_QUANTIFIER); + DUK_WO_NORETURN(return;); +#endif +} + +/* + * Special parser for character classes; calls callback for every + * range parsed and returns the number of ranges present. + */ + +/* XXX: this duplicates functionality in duk_regexp.c where a similar loop is + * required anyway. We could use that BUT we need to update the regexp compiler + * 'nranges' too. Work this out a bit more cleanly to save space. + */ + +/* XXX: the handling of character range detection is a bit convoluted. + * Try to simplify and make smaller. + */ + +/* XXX: logic for handling character ranges is now incorrect, it will accept + * e.g. [\d-z] whereas it should croak from it? SMJS accepts this too, though. + * + * Needs a read through and a lot of additional tests. + */ + +DUK_LOCAL +void duk__emit_u16_direct_ranges(duk_lexer_ctx *lex_ctx, + duk_re_range_callback gen_range, + void *userdata, + const duk_uint16_t *ranges, + duk_small_int_t num) { + const duk_uint16_t *ranges_end; + + DUK_UNREF(lex_ctx); + + ranges_end = ranges + num; + while (ranges < ranges_end) { + /* mark range 'direct', bypass canonicalization (see Wiki) */ + gen_range(userdata, (duk_codepoint_t) ranges[0], (duk_codepoint_t) ranges[1], 1); + ranges += 2; + } +} + +DUK_INTERNAL void duk_lexer_parse_re_ranges(duk_lexer_ctx *lex_ctx, duk_re_range_callback gen_range, void *userdata) { + duk_codepoint_t start = -1; + duk_codepoint_t ch; + duk_codepoint_t x; + duk_bool_t dash = 0; + duk_small_uint_t adv = 0; + + DUK_DD(DUK_DDPRINT("parsing regexp ranges")); + + for (;;) { + DUK__ADVANCECHARS(lex_ctx, adv); + adv = 1; + + x = DUK__L0(); + + ch = -1; /* not strictly necessary, but avoids "uninitialized variable" warnings */ + DUK_UNREF(ch); + + if (x < 0) { + goto fail_unterm_charclass; + } else if (x == DUK_ASC_RBRACKET) { + if (start >= 0) { + gen_range(userdata, start, start, 0); + } + DUK__ADVANCECHARS(lex_ctx, 1); /* eat ']' before finishing */ + break; + } else if (x == DUK_ASC_MINUS) { + if (start >= 0 && !dash && DUK__L1() != DUK_ASC_RBRACKET) { + /* '-' as a range indicator */ + dash = 1; + continue; + } else { + /* '-' verbatim */ + ch = x; + } + } else if (x == DUK_ASC_BACKSLASH) { + /* + * The escapes are same as outside a character class, except that \b has a + * different meaning, and \B and backreferences are prohibited (see E5 + * Section 15.10.2.19). However, it's difficult to share code because we + * handle e.g. "\n" very differently: here we generate a single character + * range for it. + */ + + /* XXX: ES2015 surrogate pair handling. */ + + x = DUK__L1(); + + adv = 2; + + if (x == DUK_ASC_LC_B) { + /* Note: '\b' in char class is different than outside (assertion), + * '\B' is not allowed and is caught by the duk_unicode_is_identifier_part() + * check below. + */ + ch = 0x0008; + } else if (x == DUK_ASC_LC_F) { + ch = 0x000c; + } else if (x == DUK_ASC_LC_N) { + ch = 0x000a; + } else if (x == DUK_ASC_LC_T) { + ch = 0x0009; + } else if (x == DUK_ASC_LC_R) { + ch = 0x000d; + } else if (x == DUK_ASC_LC_V) { + ch = 0x000b; + } else if (x == DUK_ASC_LC_C) { + x = DUK__L2(); + adv = 3; + if ((x >= DUK_ASC_LC_A && x <= DUK_ASC_LC_Z) || + (x >= DUK_ASC_UC_A && x <= DUK_ASC_UC_Z)) { + ch = (x % 32); + } else { + goto fail_escape; + } + } else if (x == DUK_ASC_LC_X || x == DUK_ASC_LC_U) { + /* The \u{H+} form is only allowed in Unicode mode which + * we don't support yet. + */ + ch = duk__lexer_parse_escape(lex_ctx, 0 /*allow_es6*/); + adv = 0; + } else if (x == DUK_ASC_LC_D) { + duk__emit_u16_direct_ranges(lex_ctx, + gen_range, + userdata, + duk_unicode_re_ranges_digit, + sizeof(duk_unicode_re_ranges_digit) / sizeof(duk_uint16_t)); + ch = -1; + } else if (x == DUK_ASC_UC_D) { + duk__emit_u16_direct_ranges(lex_ctx, + gen_range, + userdata, + duk_unicode_re_ranges_not_digit, + sizeof(duk_unicode_re_ranges_not_digit) / sizeof(duk_uint16_t)); + ch = -1; + } else if (x == DUK_ASC_LC_S) { + duk__emit_u16_direct_ranges(lex_ctx, + gen_range, + userdata, + duk_unicode_re_ranges_white, + sizeof(duk_unicode_re_ranges_white) / sizeof(duk_uint16_t)); + ch = -1; + } else if (x == DUK_ASC_UC_S) { + duk__emit_u16_direct_ranges(lex_ctx, + gen_range, + userdata, + duk_unicode_re_ranges_not_white, + sizeof(duk_unicode_re_ranges_not_white) / sizeof(duk_uint16_t)); + ch = -1; + } else if (x == DUK_ASC_LC_W) { + duk__emit_u16_direct_ranges(lex_ctx, + gen_range, + userdata, + duk_unicode_re_ranges_wordchar, + sizeof(duk_unicode_re_ranges_wordchar) / sizeof(duk_uint16_t)); + ch = -1; + } else if (x == DUK_ASC_UC_W) { + duk__emit_u16_direct_ranges(lex_ctx, + gen_range, + userdata, + duk_unicode_re_ranges_not_wordchar, + sizeof(duk_unicode_re_ranges_not_wordchar) / sizeof(duk_uint16_t)); + ch = -1; + } else if (DUK__ISDIGIT(x)) { + /* DecimalEscape, only \0 is allowed, no leading + * zeroes are allowed. + * + * ES2015 Annex B also allows (maximal match) legacy + * octal escapes up to \377 and \8 and \9 are + * accepted as literal '8' and '9', also in strict mode. + */ + +#if defined(DUK_USE_ES6_REGEXP_SYNTAX) + ch = duk__lexer_parse_legacy_octal(lex_ctx, &adv, 0 /*reject_annex_b*/); + DUK_ASSERT(ch >= 0); /* no rejections */ +#else + if (x == DUK_ASC_0 && !DUK__ISDIGIT(DUK__L2())) { + ch = 0x0000; + } else { + goto fail_escape; + } +#endif +#if defined(DUK_USE_ES6_REGEXP_SYNTAX) + } else if (x >= 0) { + /* IdentityEscape: ES2015 Annex B allows almost all + * source characters here. Match anything except + * EOF here. + */ + ch = x; +#else /* DUK_USE_ES6_REGEXP_SYNTAX */ + } else if (!duk_unicode_is_identifier_part(x)) { + /* IdentityEscape: ES5.1 doesn't allow identity escape + * for identifier part characters, which conflicts with + * some real world code. For example, it doesn't allow + * /[\$]/ which is awkward. + */ + ch = x; +#endif /* DUK_USE_ES6_REGEXP_SYNTAX */ + } else { + goto fail_escape; + } + } else { + /* character represents itself */ + ch = x; + } + + /* ch is a literal character here or -1 if parsed entity was + * an escape such as "\s". + */ + + if (ch < 0) { + /* multi-character sets not allowed as part of ranges, see + * E5 Section 15.10.2.15, abstract operation CharacterRange. + */ + if (start >= 0) { + if (dash) { + goto fail_range; + } else { + gen_range(userdata, start, start, 0); + start = -1; + /* dash is already 0 */ + } + } + } else { + if (start >= 0) { + if (dash) { + if (start > ch) { + goto fail_range; + } + gen_range(userdata, start, ch, 0); + start = -1; + dash = 0; + } else { + gen_range(userdata, start, start, 0); + start = ch; + /* dash is already 0 */ + } + } else { + start = ch; + } + } + } + + return; + + fail_escape: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_REGEXP_ESCAPE); + DUK_WO_NORETURN(return;); + + fail_range: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_INVALID_RANGE); + DUK_WO_NORETURN(return;); + + fail_unterm_charclass: + DUK_ERROR_SYNTAX(lex_ctx->thr, DUK_STR_UNTERMINATED_CHARCLASS); + DUK_WO_NORETURN(return;); +} + +#endif /* DUK_USE_REGEXP_SUPPORT */ + +/* automatic undefs */ +#undef DUK__ADVANCEBYTES +#undef DUK__ADVANCECHARS +#undef DUK__ADVTOK +#undef DUK__APPENDBUFFER +#undef DUK__APPENDBUFFER_ASCII +#undef DUK__INITBUFFER +#undef DUK__ISDIGIT +#undef DUK__ISDIGIT03 +#undef DUK__ISDIGIT47 +#undef DUK__ISHEXDIGIT +#undef DUK__ISOCTDIGIT +#undef DUK__L0 +#undef DUK__L1 +#undef DUK__L2 +#undef DUK__L3 +#undef DUK__L4 +#undef DUK__L5 +#undef DUK__LOOKUP +#undef DUK__MAX_RE_DECESC_DIGITS +#undef DUK__MAX_RE_QUANT_DIGITS +#line 1 "duk_numconv.c" +/* + * Number-to-string and string-to-number conversions. + * + * Slow path number-to-string and string-to-number conversion is based on + * a Dragon4 variant, with fast paths for small integers. Big integer + * arithmetic is needed for guaranteeing that the conversion is correct + * and uses a minimum number of digits. The big number arithmetic has a + * fixed maximum size and does not require dynamic allocations. + * + * See: doc/number-conversion.rst. + */ + +/* #include duk_internal.h -> already included */ + +#define DUK__IEEE_DOUBLE_EXP_BIAS 1023 +#define DUK__IEEE_DOUBLE_EXP_MIN (-1022) /* biased exp == 0 -> denormal, exp -1022 */ + +#define DUK__DIGITCHAR(x) duk_lc_digits[(x)] + +/* + * Tables generated with util/gennumdigits.py. + * + * duk__str2num_digits_for_radix indicates, for each radix, how many input + * digits should be considered significant for string-to-number conversion. + * The input is also padded to this many digits to give the Dragon4 + * conversion enough (apparent) precision to work with. + * + * duk__str2num_exp_limits indicates, for each radix, the radix-specific + * minimum/maximum exponent values (for a Dragon4 integer mantissa) + * below and above which the number is guaranteed to underflow to zero + * or overflow to Infinity. This allows parsing to keep bigint values + * bounded. + */ + +DUK_LOCAL const duk_uint8_t duk__str2num_digits_for_radix[] = { + 69, 44, 35, 30, 27, 25, 23, 22, 20, 20, /* 2 to 11 */ + 20, 19, 19, 18, 18, 17, 17, 17, 16, 16, /* 12 to 21 */ + 16, 16, 16, 15, 15, 15, 15, 15, 15, 14, /* 22 to 31 */ + 14, 14, 14, 14, 14 /* 31 to 36 */ +}; + +typedef struct { + duk_int16_t upper; + duk_int16_t lower; +} duk__exp_limits; + +DUK_LOCAL const duk__exp_limits duk__str2num_exp_limits[] = { + { 957, -1147 }, { 605, -725 }, { 479, -575 }, { 414, -496 }, + { 372, -446 }, { 342, -411 }, { 321, -384 }, { 304, -364 }, + { 291, -346 }, { 279, -334 }, { 268, -323 }, { 260, -312 }, + { 252, -304 }, { 247, -296 }, { 240, -289 }, { 236, -283 }, + { 231, -278 }, { 227, -273 }, { 223, -267 }, { 220, -263 }, + { 216, -260 }, { 213, -256 }, { 210, -253 }, { 208, -249 }, + { 205, -246 }, { 203, -244 }, { 201, -241 }, { 198, -239 }, + { 196, -237 }, { 195, -234 }, { 193, -232 }, { 191, -230 }, + { 190, -228 }, { 188, -226 }, { 187, -225 }, +}; + +/* + * Limited functionality bigint implementation. + * + * Restricted to non-negative numbers with less than 32 * DUK__BI_MAX_PARTS bits, + * with the caller responsible for ensuring this is never exceeded. No memory + * allocation (except stack) is needed for bigint computation. Operations + * have been tailored for number conversion needs. + * + * Argument order is "assignment order", i.e. target first, then arguments: + * x <- y * z --> duk__bi_mul(x, y, z); + */ + +/* This upper value has been experimentally determined; debug build will check + * bigint size with assertions. + */ +#define DUK__BI_MAX_PARTS 37 /* 37x32 = 1184 bits */ + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) +#define DUK__BI_PRINT(name,x) duk__bi_print((name),(x)) +#else +#define DUK__BI_PRINT(name,x) +#endif + +/* Current size is about 152 bytes. */ +typedef struct { + duk_small_int_t n; + duk_uint32_t v[DUK__BI_MAX_PARTS]; /* low to high */ +} duk__bigint; + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) +DUK_LOCAL void duk__bi_print(const char *name, duk__bigint *x) { + /* Overestimate required size; debug code so not critical to be tight. */ + char buf[DUK__BI_MAX_PARTS * 9 + 64]; + char *p = buf; + duk_small_int_t i; + + /* No NUL term checks in this debug code. */ + p += DUK_SPRINTF(p, "%p n=%ld", (void *) x, (long) x->n); + if (x->n == 0) { + p += DUK_SPRINTF(p, " 0"); + } + for (i = x->n - 1; i >= 0; i--) { + p += DUK_SPRINTF(p, " %08lx", (unsigned long) x->v[i]); + } + + DUK_DDD(DUK_DDDPRINT("%s: %s", (const char *) name, (const char *) buf)); +} +#endif + +#if defined(DUK_USE_ASSERTIONS) +DUK_LOCAL duk_small_int_t duk__bi_is_valid(duk__bigint *x) { + return (duk_small_int_t) + ( ((x->n >= 0) && (x->n <= DUK__BI_MAX_PARTS)) /* is valid size */ && + ((x->n == 0) || (x->v[x->n - 1] != 0)) /* is normalized */ ); +} +#endif + +DUK_LOCAL void duk__bi_normalize(duk__bigint *x) { + duk_small_int_t i; + + for (i = x->n - 1; i >= 0; i--) { + if (x->v[i] != 0) { + break; + } + } + + /* Note: if 'x' is zero, x->n becomes 0 here */ + x->n = i + 1; + DUK_ASSERT(duk__bi_is_valid(x)); +} + +/* x <- y */ +DUK_LOCAL void duk__bi_copy(duk__bigint *x, duk__bigint *y) { + duk_small_int_t n; + + n = y->n; + x->n = n; + /* No need to special case n == 0. */ + duk_memcpy((void *) x->v, (const void *) y->v, (size_t) (sizeof(duk_uint32_t) * (size_t) n)); +} + +DUK_LOCAL void duk__bi_set_small(duk__bigint *x, duk_uint32_t v) { + if (v == 0U) { + x->n = 0; + } else { + x->n = 1; + x->v[0] = v; + } + DUK_ASSERT(duk__bi_is_valid(x)); +} + +/* Return value: <0 <=> x < y + * 0 <=> x == y + * >0 <=> x > y + */ +DUK_LOCAL int duk__bi_compare(duk__bigint *x, duk__bigint *y) { + duk_small_int_t i, nx, ny; + duk_uint32_t tx, ty; + + DUK_ASSERT(duk__bi_is_valid(x)); + DUK_ASSERT(duk__bi_is_valid(y)); + + nx = x->n; + ny = y->n; + if (nx > ny) { + goto ret_gt; + } + if (nx < ny) { + goto ret_lt; + } + for (i = nx - 1; i >= 0; i--) { + tx = x->v[i]; + ty = y->v[i]; + + if (tx > ty) { + goto ret_gt; + } + if (tx < ty) { + goto ret_lt; + } + } + + return 0; + + ret_gt: + return 1; + + ret_lt: + return -1; +} + +/* x <- y + z */ +#if defined(DUK_USE_64BIT_OPS) +DUK_LOCAL void duk__bi_add(duk__bigint *x, duk__bigint *y, duk__bigint *z) { + duk_uint64_t tmp; + duk_small_int_t i, ny, nz; + + DUK_ASSERT(duk__bi_is_valid(y)); + DUK_ASSERT(duk__bi_is_valid(z)); + + if (z->n > y->n) { + duk__bigint *t; + t = y; y = z; z = t; + } + DUK_ASSERT(y->n >= z->n); + + ny = y->n; nz = z->n; + tmp = 0U; + for (i = 0; i < ny; i++) { + DUK_ASSERT(i < DUK__BI_MAX_PARTS); + tmp += y->v[i]; + if (i < nz) { + tmp += z->v[i]; + } + x->v[i] = (duk_uint32_t) (tmp & 0xffffffffUL); + tmp = tmp >> 32; + } + if (tmp != 0U) { + DUK_ASSERT(i < DUK__BI_MAX_PARTS); + x->v[i++] = (duk_uint32_t) tmp; + } + x->n = i; + DUK_ASSERT(x->n <= DUK__BI_MAX_PARTS); + + /* no need to normalize */ + DUK_ASSERT(duk__bi_is_valid(x)); +} +#else /* DUK_USE_64BIT_OPS */ +DUK_LOCAL void duk__bi_add(duk__bigint *x, duk__bigint *y, duk__bigint *z) { + duk_uint32_t carry, tmp1, tmp2; + duk_small_int_t i, ny, nz; + + DUK_ASSERT(duk__bi_is_valid(y)); + DUK_ASSERT(duk__bi_is_valid(z)); + + if (z->n > y->n) { + duk__bigint *t; + t = y; y = z; z = t; + } + DUK_ASSERT(y->n >= z->n); + + ny = y->n; nz = z->n; + carry = 0U; + for (i = 0; i < ny; i++) { + /* Carry is detected based on wrapping which relies on exact 32-bit + * types. + */ + DUK_ASSERT(i < DUK__BI_MAX_PARTS); + tmp1 = y->v[i]; + tmp2 = tmp1; + if (i < nz) { + tmp2 += z->v[i]; + } + + /* Careful with carry condition: + * - If carry not added: 0x12345678 + 0 + 0xffffffff = 0x12345677 (< 0x12345678) + * - If carry added: 0x12345678 + 1 + 0xffffffff = 0x12345678 (== 0x12345678) + */ + if (carry) { + tmp2++; + carry = (tmp2 <= tmp1 ? 1U : 0U); + } else { + carry = (tmp2 < tmp1 ? 1U : 0U); + } + + x->v[i] = tmp2; + } + if (carry) { + DUK_ASSERT(i < DUK__BI_MAX_PARTS); + DUK_ASSERT(carry == 1U); + x->v[i++] = carry; + } + x->n = i; + DUK_ASSERT(x->n <= DUK__BI_MAX_PARTS); + + /* no need to normalize */ + DUK_ASSERT(duk__bi_is_valid(x)); +} +#endif /* DUK_USE_64BIT_OPS */ + +/* x <- y + z */ +DUK_LOCAL void duk__bi_add_small(duk__bigint *x, duk__bigint *y, duk_uint32_t z) { + duk__bigint tmp; + + DUK_ASSERT(duk__bi_is_valid(y)); + + /* XXX: this could be optimized; there is only one call site now though */ + duk__bi_set_small(&tmp, z); + duk__bi_add(x, y, &tmp); + + DUK_ASSERT(duk__bi_is_valid(x)); +} + +#if 0 /* unused */ +/* x <- x + y, use t as temp */ +DUK_LOCAL void duk__bi_add_copy(duk__bigint *x, duk__bigint *y, duk__bigint *t) { + duk__bi_add(t, x, y); + duk__bi_copy(x, t); +} +#endif + +/* x <- y - z, require x >= y => z >= 0, i.e. y >= z */ +#if defined(DUK_USE_64BIT_OPS) +DUK_LOCAL void duk__bi_sub(duk__bigint *x, duk__bigint *y, duk__bigint *z) { + duk_small_int_t i, ny, nz; + duk_uint32_t ty, tz; + duk_int64_t tmp; + + DUK_ASSERT(duk__bi_is_valid(y)); + DUK_ASSERT(duk__bi_is_valid(z)); + DUK_ASSERT(duk__bi_compare(y, z) >= 0); + DUK_ASSERT(y->n >= z->n); + + ny = y->n; nz = z->n; + tmp = 0; + for (i = 0; i < ny; i++) { + ty = y->v[i]; + if (i < nz) { + tz = z->v[i]; + } else { + tz = 0; + } + tmp = (duk_int64_t) ty - (duk_int64_t) tz + tmp; + x->v[i] = (duk_uint32_t) ((duk_uint64_t) tmp & 0xffffffffUL); + tmp = tmp >> 32; /* 0 or -1 */ + } + DUK_ASSERT(tmp == 0); + + x->n = i; + duk__bi_normalize(x); /* need to normalize, may even cancel to 0 */ + DUK_ASSERT(duk__bi_is_valid(x)); +} +#else +DUK_LOCAL void duk__bi_sub(duk__bigint *x, duk__bigint *y, duk__bigint *z) { + duk_small_int_t i, ny, nz; + duk_uint32_t tmp1, tmp2, borrow; + + DUK_ASSERT(duk__bi_is_valid(y)); + DUK_ASSERT(duk__bi_is_valid(z)); + DUK_ASSERT(duk__bi_compare(y, z) >= 0); + DUK_ASSERT(y->n >= z->n); + + ny = y->n; nz = z->n; + borrow = 0U; + for (i = 0; i < ny; i++) { + /* Borrow is detected based on wrapping which relies on exact 32-bit + * types. + */ + tmp1 = y->v[i]; + tmp2 = tmp1; + if (i < nz) { + tmp2 -= z->v[i]; + } + + /* Careful with borrow condition: + * - If borrow not subtracted: 0x12345678 - 0 - 0xffffffff = 0x12345679 (> 0x12345678) + * - If borrow subtracted: 0x12345678 - 1 - 0xffffffff = 0x12345678 (== 0x12345678) + */ + if (borrow) { + tmp2--; + borrow = (tmp2 >= tmp1 ? 1U : 0U); + } else { + borrow = (tmp2 > tmp1 ? 1U : 0U); + } + + x->v[i] = tmp2; + } + DUK_ASSERT(borrow == 0U); + + x->n = i; + duk__bi_normalize(x); /* need to normalize, may even cancel to 0 */ + DUK_ASSERT(duk__bi_is_valid(x)); +} +#endif + +#if 0 /* unused */ +/* x <- y - z */ +DUK_LOCAL void duk__bi_sub_small(duk__bigint *x, duk__bigint *y, duk_uint32_t z) { + duk__bigint tmp; + + DUK_ASSERT(duk__bi_is_valid(y)); + + /* XXX: this could be optimized */ + duk__bi_set_small(&tmp, z); + duk__bi_sub(x, y, &tmp); + + DUK_ASSERT(duk__bi_is_valid(x)); +} +#endif + +/* x <- x - y, use t as temp */ +DUK_LOCAL void duk__bi_sub_copy(duk__bigint *x, duk__bigint *y, duk__bigint *t) { + duk__bi_sub(t, x, y); + duk__bi_copy(x, t); +} + +/* x <- y * z */ +DUK_LOCAL void duk__bi_mul(duk__bigint *x, duk__bigint *y, duk__bigint *z) { + duk_small_int_t i, j, nx, nz; + + DUK_ASSERT(duk__bi_is_valid(y)); + DUK_ASSERT(duk__bi_is_valid(z)); + + nx = y->n + z->n; /* max possible */ + DUK_ASSERT(nx <= DUK__BI_MAX_PARTS); + + if (nx == 0) { + /* Both inputs are zero; cases where only one is zero can go + * through main algorithm. + */ + x->n = 0; + return; + } + + duk_memzero((void *) x->v, (size_t) (sizeof(duk_uint32_t) * (size_t) nx)); + x->n = nx; + + nz = z->n; + for (i = 0; i < y->n; i++) { +#if defined(DUK_USE_64BIT_OPS) + duk_uint64_t tmp = 0U; + for (j = 0; j < nz; j++) { + tmp += (duk_uint64_t) y->v[i] * (duk_uint64_t) z->v[j] + x->v[i+j]; + x->v[i+j] = (duk_uint32_t) (tmp & 0xffffffffUL); + tmp = tmp >> 32; + } + if (tmp > 0) { + DUK_ASSERT(i + j < nx); + DUK_ASSERT(i + j < DUK__BI_MAX_PARTS); + DUK_ASSERT(x->v[i+j] == 0U); + x->v[i+j] = (duk_uint32_t) tmp; + } +#else + /* + * Multiply + add + carry for 32-bit components using only 16x16->32 + * multiplies and carry detection based on unsigned overflow. + * + * 1st mult, 32-bit: (A*2^16 + B) + * 2nd mult, 32-bit: (C*2^16 + D) + * 3rd add, 32-bit: E + * 4th add, 32-bit: F + * + * (AC*2^16 + B) * (C*2^16 + D) + E + F + * = AC*2^32 + AD*2^16 + BC*2^16 + BD + E + F + * = AC*2^32 + (AD + BC)*2^16 + (BD + E + F) + * = AC*2^32 + AD*2^16 + BC*2^16 + (BD + E + F) + */ + duk_uint32_t a, b, c, d, e, f; + duk_uint32_t r, s, t; + + a = y->v[i]; b = a & 0xffffUL; a = a >> 16; + + f = 0; + for (j = 0; j < nz; j++) { + c = z->v[j]; d = c & 0xffffUL; c = c >> 16; + e = x->v[i+j]; + + /* build result as: (r << 32) + s: start with (BD + E + F) */ + r = 0; + s = b * d; + + /* add E */ + t = s + e; + if (t < s) { r++; } /* carry */ + s = t; + + /* add F */ + t = s + f; + if (t < s) { r++; } /* carry */ + s = t; + + /* add BC*2^16 */ + t = b * c; + r += (t >> 16); + t = s + ((t & 0xffffUL) << 16); + if (t < s) { r++; } /* carry */ + s = t; + + /* add AD*2^16 */ + t = a * d; + r += (t >> 16); + t = s + ((t & 0xffffUL) << 16); + if (t < s) { r++; } /* carry */ + s = t; + + /* add AC*2^32 */ + t = a * c; + r += t; + + DUK_DDD(DUK_DDDPRINT("ab=%08lx cd=%08lx ef=%08lx -> rs=%08lx %08lx", + (unsigned long) y->v[i], (unsigned long) z->v[j], + (unsigned long) x->v[i+j], (unsigned long) r, + (unsigned long) s)); + + x->v[i+j] = s; + f = r; + } + if (f > 0U) { + DUK_ASSERT(i + j < nx); + DUK_ASSERT(i + j < DUK__BI_MAX_PARTS); + DUK_ASSERT(x->v[i+j] == 0U); + x->v[i+j] = (duk_uint32_t) f; + } +#endif /* DUK_USE_64BIT_OPS */ + } + + duk__bi_normalize(x); + DUK_ASSERT(duk__bi_is_valid(x)); +} + +/* x <- y * z */ +DUK_LOCAL void duk__bi_mul_small(duk__bigint *x, duk__bigint *y, duk_uint32_t z) { + duk__bigint tmp; + + DUK_ASSERT(duk__bi_is_valid(y)); + + /* XXX: this could be optimized */ + duk__bi_set_small(&tmp, z); + duk__bi_mul(x, y, &tmp); + + DUK_ASSERT(duk__bi_is_valid(x)); +} + +/* x <- x * y, use t as temp */ +DUK_LOCAL void duk__bi_mul_copy(duk__bigint *x, duk__bigint *y, duk__bigint *t) { + duk__bi_mul(t, x, y); + duk__bi_copy(x, t); +} + +/* x <- x * y, use t as temp */ +DUK_LOCAL void duk__bi_mul_small_copy(duk__bigint *x, duk_uint32_t y, duk__bigint *t) { + duk__bi_mul_small(t, x, y); + duk__bi_copy(x, t); +} + +DUK_LOCAL int duk__bi_is_even(duk__bigint *x) { + DUK_ASSERT(duk__bi_is_valid(x)); + return (x->n == 0) || ((x->v[0] & 0x01) == 0); +} + +DUK_LOCAL int duk__bi_is_zero(duk__bigint *x) { + DUK_ASSERT(duk__bi_is_valid(x)); + return (x->n == 0); /* this is the case for normalized numbers */ +} + +/* Bigint is 2^52. Used to detect normalized IEEE double mantissa values + * which are at the lowest edge (next floating point value downwards has + * a different exponent). The lowest mantissa has the form: + * + * 1000........000 (52 zeroes; only "hidden bit" is set) + */ +DUK_LOCAL duk_small_int_t duk__bi_is_2to52(duk__bigint *x) { + DUK_ASSERT(duk__bi_is_valid(x)); + return (duk_small_int_t) + (x->n == 2) && (x->v[0] == 0U) && (x->v[1] == (1U << (52-32))); +} + +/* x <- (1<<y) */ +DUK_LOCAL void duk__bi_twoexp(duk__bigint *x, duk_small_int_t y) { + duk_small_int_t n, r; + + n = (y / 32) + 1; + DUK_ASSERT(n > 0); + r = y % 32; + duk_memzero((void *) x->v, sizeof(duk_uint32_t) * (size_t) n); + x->n = n; + x->v[n - 1] = (((duk_uint32_t) 1) << r); +} + +/* x <- b^y; use t1 and t2 as temps */ +DUK_LOCAL void duk__bi_exp_small(duk__bigint *x, duk_small_int_t b, duk_small_int_t y, duk__bigint *t1, duk__bigint *t2) { + /* Fast path the binary case */ + + DUK_ASSERT(x != t1 && x != t2 && t1 != t2); /* distinct bignums, easy mistake to make */ + DUK_ASSERT(b >= 0); + DUK_ASSERT(y >= 0); + + if (b == 2) { + duk__bi_twoexp(x, y); + return; + } + + /* http://en.wikipedia.org/wiki/Exponentiation_by_squaring */ + + DUK_DDD(DUK_DDDPRINT("exp_small: b=%ld, y=%ld", (long) b, (long) y)); + + duk__bi_set_small(x, 1); + duk__bi_set_small(t1, (duk_uint32_t) b); + for (;;) { + /* Loop structure ensures that we don't compute t1^2 unnecessarily + * on the final round, as that might create a bignum exceeding the + * current DUK__BI_MAX_PARTS limit. + */ + if (y & 0x01) { + duk__bi_mul_copy(x, t1, t2); + } + y = y >> 1; + if (y == 0) { + break; + } + duk__bi_mul_copy(t1, t1, t2); + } + + DUK__BI_PRINT("exp_small result", x); +} + +/* + * A Dragon4 number-to-string variant, based on: + * + * Guy L. Steele Jr., Jon L. White: "How to Print Floating-Point Numbers + * Accurately" + * + * Robert G. Burger, R. Kent Dybvig: "Printing Floating-Point Numbers + * Quickly and Accurately" + * + * The current algorithm is based on Figure 1 of the Burger-Dybvig paper, + * i.e. the base implementation without logarithm estimation speedups + * (these would increase code footprint considerably). Fixed-format output + * does not follow the suggestions in the paper; instead, we generate an + * extra digit and round-with-carry. + * + * The same algorithm is used for number parsing (with b=10 and B=2) + * by generating one extra digit and doing rounding manually. + * + * See doc/number-conversion.rst for limitations. + */ + +/* Maximum number of digits generated. */ +#define DUK__MAX_OUTPUT_DIGITS 1040 /* (Number.MAX_VALUE).toString(2).length == 1024, + slack */ + +/* Maximum number of characters in formatted value. */ +#define DUK__MAX_FORMATTED_LENGTH 1040 /* (-Number.MAX_VALUE).toString(2).length == 1025, + slack */ + +/* Number and (minimum) size of bigints in the nc_ctx structure. */ +#define DUK__NUMCONV_CTX_NUM_BIGINTS 7 +#define DUK__NUMCONV_CTX_BIGINTS_SIZE (sizeof(duk__bigint) * DUK__NUMCONV_CTX_NUM_BIGINTS) + +typedef struct { + /* Currently about 7*152 = 1064 bytes. The space for these + * duk__bigints is used also as a temporary buffer for generating + * the final string. This is a bit awkard; a union would be + * more correct. + */ + duk__bigint f, r, s, mp, mm, t1, t2; + + duk_small_int_t is_s2n; /* if 1, doing a string-to-number; else doing a number-to-string */ + duk_small_int_t is_fixed; /* if 1, doing a fixed format output (not free format) */ + duk_small_int_t req_digits; /* requested number of output digits; 0 = free-format */ + duk_small_int_t abs_pos; /* digit position is absolute, not relative */ + duk_small_int_t e; /* exponent for 'f' */ + duk_small_int_t b; /* input radix */ + duk_small_int_t B; /* output radix */ + duk_small_int_t k; /* see algorithm */ + duk_small_int_t low_ok; /* see algorithm */ + duk_small_int_t high_ok; /* see algorithm */ + duk_small_int_t unequal_gaps; /* m+ != m- (very rarely) */ + + /* Buffer used for generated digits, values are in the range [0,B-1]. */ + duk_uint8_t digits[DUK__MAX_OUTPUT_DIGITS]; + duk_small_int_t count; /* digit count */ +} duk__numconv_stringify_ctx; + +/* Note: computes with 'idx' in assertions, so caller beware. + * 'idx' is preincremented, i.e. '1' on first call, because it + * is more convenient for the caller. + */ +#define DUK__DRAGON4_OUTPUT_PREINC(nc_ctx,preinc_idx,x) do { \ + DUK_ASSERT((preinc_idx) - 1 >= 0); \ + DUK_ASSERT((preinc_idx) - 1 < DUK__MAX_OUTPUT_DIGITS); \ + ((nc_ctx)->digits[(preinc_idx) - 1]) = (duk_uint8_t) (x); \ + } while (0) + +DUK_LOCAL duk_size_t duk__dragon4_format_uint32(duk_uint8_t *buf, duk_uint32_t x, duk_small_int_t radix) { + duk_uint8_t *p; + duk_size_t len; + duk_small_int_t dig; + duk_uint32_t t; + + DUK_ASSERT(buf != NULL); + DUK_ASSERT(radix >= 2 && radix <= 36); + + /* A 32-bit unsigned integer formats to at most 32 digits (the + * worst case happens with radix == 2). Output the digits backwards, + * and use a memmove() to get them in the right place. + */ + + p = buf + 32; + for (;;) { + t = x / (duk_uint32_t) radix; + dig = (duk_small_int_t) (x - t * (duk_uint32_t) radix); + x = t; + + DUK_ASSERT(dig >= 0 && dig < 36); + *(--p) = DUK__DIGITCHAR(dig); + + if (x == 0) { + break; + } + } + len = (duk_size_t) ((buf + 32) - p); + + duk_memmove((void *) buf, (const void *) p, (size_t) len); + + return len; +} + +DUK_LOCAL void duk__dragon4_prepare(duk__numconv_stringify_ctx *nc_ctx) { + duk_small_int_t lowest_mantissa; + +#if 1 + /* Assume IEEE round-to-even, so that shorter encoding can be used + * when round-to-even would produce correct result. By removing + * this check (and having low_ok == high_ok == 0) the results would + * still be accurate but in some cases longer than necessary. + */ + if (duk__bi_is_even(&nc_ctx->f)) { + DUK_DDD(DUK_DDDPRINT("f is even")); + nc_ctx->low_ok = 1; + nc_ctx->high_ok = 1; + } else { + DUK_DDD(DUK_DDDPRINT("f is odd")); + nc_ctx->low_ok = 0; + nc_ctx->high_ok = 0; + } +#else + /* Note: not honoring round-to-even should work but now generates incorrect + * results. For instance, 1e23 serializes to "a000...", i.e. the first digit + * equals the radix (10). Scaling stops one step too early in this case. + * Don't know why this is the case, but since this code path is unused, it + * doesn't matter. + */ + nc_ctx->low_ok = 0; + nc_ctx->high_ok = 0; +#endif + + /* For string-to-number, pretend we never have the lowest mantissa as there + * is no natural "precision" for inputs. Having lowest_mantissa == 0, we'll + * fall into the base cases for both e >= 0 and e < 0. + */ + if (nc_ctx->is_s2n) { + lowest_mantissa = 0; + } else { + lowest_mantissa = duk__bi_is_2to52(&nc_ctx->f); + } + + nc_ctx->unequal_gaps = 0; + if (nc_ctx->e >= 0) { + /* exponent non-negative (and thus not minimum exponent) */ + + if (lowest_mantissa) { + /* (>= e 0) AND (= f (expt b (- p 1))) + * + * be <- (expt b e) == b^e + * be1 <- (* be b) == (expt b (+ e 1)) == b^(e+1) + * r <- (* f be1 2) == 2 * f * b^(e+1) [if b==2 -> f * b^(e+2)] + * s <- (* b 2) [if b==2 -> 4] + * m+ <- be1 == b^(e+1) + * m- <- be == b^e + * k <- 0 + * B <- B + * low_ok <- round + * high_ok <- round + */ + + DUK_DDD(DUK_DDDPRINT("non-negative exponent (not smallest exponent); " + "lowest mantissa value for this exponent -> " + "unequal gaps")); + + duk__bi_exp_small(&nc_ctx->mm, nc_ctx->b, nc_ctx->e, &nc_ctx->t1, &nc_ctx->t2); /* mm <- b^e */ + duk__bi_mul_small(&nc_ctx->mp, &nc_ctx->mm, (duk_uint32_t) nc_ctx->b); /* mp <- b^(e+1) */ + duk__bi_mul_small(&nc_ctx->t1, &nc_ctx->f, 2); + duk__bi_mul(&nc_ctx->r, &nc_ctx->t1, &nc_ctx->mp); /* r <- (2 * f) * b^(e+1) */ + duk__bi_set_small(&nc_ctx->s, (duk_uint32_t) (nc_ctx->b * 2)); /* s <- 2 * b */ + nc_ctx->unequal_gaps = 1; + } else { + /* (>= e 0) AND (not (= f (expt b (- p 1)))) + * + * be <- (expt b e) == b^e + * r <- (* f be 2) == 2 * f * b^e [if b==2 -> f * b^(e+1)] + * s <- 2 + * m+ <- be == b^e + * m- <- be == b^e + * k <- 0 + * B <- B + * low_ok <- round + * high_ok <- round + */ + + DUK_DDD(DUK_DDDPRINT("non-negative exponent (not smallest exponent); " + "not lowest mantissa for this exponent -> " + "equal gaps")); + + duk__bi_exp_small(&nc_ctx->mm, nc_ctx->b, nc_ctx->e, &nc_ctx->t1, &nc_ctx->t2); /* mm <- b^e */ + duk__bi_copy(&nc_ctx->mp, &nc_ctx->mm); /* mp <- b^e */ + duk__bi_mul_small(&nc_ctx->t1, &nc_ctx->f, 2); + duk__bi_mul(&nc_ctx->r, &nc_ctx->t1, &nc_ctx->mp); /* r <- (2 * f) * b^e */ + duk__bi_set_small(&nc_ctx->s, 2); /* s <- 2 */ + } + } else { + /* When doing string-to-number, lowest_mantissa is always 0 so + * the exponent check, while incorrect, won't matter. + */ + if (nc_ctx->e > DUK__IEEE_DOUBLE_EXP_MIN /*not minimum exponent*/ && + lowest_mantissa /* lowest mantissa for this exponent*/) { + /* r <- (* f b 2) [if b==2 -> (* f 4)] + * s <- (* (expt b (- 1 e)) 2) == b^(1-e) * 2 [if b==2 -> b^(2-e)] + * m+ <- b == 2 + * m- <- 1 + * k <- 0 + * B <- B + * low_ok <- round + * high_ok <- round + */ + + DUK_DDD(DUK_DDDPRINT("negative exponent; not minimum exponent and " + "lowest mantissa for this exponent -> " + "unequal gaps")); + + duk__bi_mul_small(&nc_ctx->r, &nc_ctx->f, (duk_uint32_t) (nc_ctx->b * 2)); /* r <- (2 * b) * f */ + duk__bi_exp_small(&nc_ctx->t1, nc_ctx->b, 1 - nc_ctx->e, &nc_ctx->s, &nc_ctx->t2); /* NB: use 's' as temp on purpose */ + duk__bi_mul_small(&nc_ctx->s, &nc_ctx->t1, 2); /* s <- b^(1-e) * 2 */ + duk__bi_set_small(&nc_ctx->mp, 2); + duk__bi_set_small(&nc_ctx->mm, 1); + nc_ctx->unequal_gaps = 1; + } else { + /* r <- (* f 2) + * s <- (* (expt b (- e)) 2) == b^(-e) * 2 [if b==2 -> b^(1-e)] + * m+ <- 1 + * m- <- 1 + * k <- 0 + * B <- B + * low_ok <- round + * high_ok <- round + */ + + DUK_DDD(DUK_DDDPRINT("negative exponent; minimum exponent or not " + "lowest mantissa for this exponent -> " + "equal gaps")); + + duk__bi_mul_small(&nc_ctx->r, &nc_ctx->f, 2); /* r <- 2 * f */ + duk__bi_exp_small(&nc_ctx->t1, nc_ctx->b, -nc_ctx->e, &nc_ctx->s, &nc_ctx->t2); /* NB: use 's' as temp on purpose */ + duk__bi_mul_small(&nc_ctx->s, &nc_ctx->t1, 2); /* s <- b^(-e) * 2 */ + duk__bi_set_small(&nc_ctx->mp, 1); + duk__bi_set_small(&nc_ctx->mm, 1); + } + } +} + +DUK_LOCAL void duk__dragon4_scale(duk__numconv_stringify_ctx *nc_ctx) { + duk_small_int_t k = 0; + + /* This is essentially the 'scale' algorithm, with recursion removed. + * Note that 'k' is either correct immediately, or will move in one + * direction in the loop. There's no need to do the low/high checks + * on every round (like the Scheme algorithm does). + * + * The scheme algorithm finds 'k' and updates 's' simultaneously, + * while the logical algorithm finds 'k' with 's' having its initial + * value, after which 's' is updated separately (see the Burger-Dybvig + * paper, Section 3.1, steps 2 and 3). + * + * The case where m+ == m- (almost always) is optimized for, because + * it reduces the bigint operations considerably and almost always + * applies. The scale loop only needs to work with m+, so this works. + */ + + /* XXX: this algorithm could be optimized quite a lot by using e.g. + * a logarithm based estimator for 'k' and performing B^n multiplication + * using a lookup table or using some bit-representation based exp + * algorithm. Currently we just loop, with significant performance + * impact for very large and very small numbers. + */ + + DUK_DDD(DUK_DDDPRINT("scale: B=%ld, low_ok=%ld, high_ok=%ld", + (long) nc_ctx->B, (long) nc_ctx->low_ok, (long) nc_ctx->high_ok)); + DUK__BI_PRINT("r(init)", &nc_ctx->r); + DUK__BI_PRINT("s(init)", &nc_ctx->s); + DUK__BI_PRINT("mp(init)", &nc_ctx->mp); + DUK__BI_PRINT("mm(init)", &nc_ctx->mm); + + for (;;) { + DUK_DDD(DUK_DDDPRINT("scale loop (inc k), k=%ld", (long) k)); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("m+", &nc_ctx->mp); + DUK__BI_PRINT("m-", &nc_ctx->mm); + + duk__bi_add(&nc_ctx->t1, &nc_ctx->r, &nc_ctx->mp); /* t1 = (+ r m+) */ + if (duk__bi_compare(&nc_ctx->t1, &nc_ctx->s) >= (nc_ctx->high_ok ? 0 : 1)) { + DUK_DDD(DUK_DDDPRINT("k is too low")); + /* r <- r + * s <- (* s B) + * m+ <- m+ + * m- <- m- + * k <- (+ k 1) + */ + + duk__bi_mul_small_copy(&nc_ctx->s, (duk_uint32_t) nc_ctx->B, &nc_ctx->t1); + k++; + } else { + break; + } + } + + /* k > 0 -> k was too low, and cannot be too high */ + if (k > 0) { + goto skip_dec_k; + } + + for (;;) { + DUK_DDD(DUK_DDDPRINT("scale loop (dec k), k=%ld", (long) k)); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("m+", &nc_ctx->mp); + DUK__BI_PRINT("m-", &nc_ctx->mm); + + duk__bi_add(&nc_ctx->t1, &nc_ctx->r, &nc_ctx->mp); /* t1 = (+ r m+) */ + duk__bi_mul_small(&nc_ctx->t2, &nc_ctx->t1, (duk_uint32_t) nc_ctx->B); /* t2 = (* (+ r m+) B) */ + if (duk__bi_compare(&nc_ctx->t2, &nc_ctx->s) <= (nc_ctx->high_ok ? -1 : 0)) { + DUK_DDD(DUK_DDDPRINT("k is too high")); + /* r <- (* r B) + * s <- s + * m+ <- (* m+ B) + * m- <- (* m- B) + * k <- (- k 1) + */ + duk__bi_mul_small_copy(&nc_ctx->r, (duk_uint32_t) nc_ctx->B, &nc_ctx->t1); + duk__bi_mul_small_copy(&nc_ctx->mp, (duk_uint32_t) nc_ctx->B, &nc_ctx->t1); + if (nc_ctx->unequal_gaps) { + DUK_DDD(DUK_DDDPRINT("m+ != m- -> need to update m- too")); + duk__bi_mul_small_copy(&nc_ctx->mm, (duk_uint32_t) nc_ctx->B, &nc_ctx->t1); + } + k--; + } else { + break; + } + } + + skip_dec_k: + + if (!nc_ctx->unequal_gaps) { + DUK_DDD(DUK_DDDPRINT("equal gaps, copy m- from m+")); + duk__bi_copy(&nc_ctx->mm, &nc_ctx->mp); /* mm <- mp */ + } + nc_ctx->k = k; + + DUK_DDD(DUK_DDDPRINT("final k: %ld", (long) k)); + DUK__BI_PRINT("r(final)", &nc_ctx->r); + DUK__BI_PRINT("s(final)", &nc_ctx->s); + DUK__BI_PRINT("mp(final)", &nc_ctx->mp); + DUK__BI_PRINT("mm(final)", &nc_ctx->mm); +} + +DUK_LOCAL void duk__dragon4_generate(duk__numconv_stringify_ctx *nc_ctx) { + duk_small_int_t tc1, tc2; /* terminating conditions */ + duk_small_int_t d; /* current digit */ + duk_small_int_t count = 0; /* digit count */ + + /* + * Digit generation loop. + * + * Different termination conditions: + * + * 1. Free format output. Terminate when shortest accurate + * representation found. + * + * 2. Fixed format output, with specific number of digits. + * Ignore termination conditions, terminate when digits + * generated. Caller requests an extra digit and rounds. + * + * 3. Fixed format output, with a specific absolute cut-off + * position (e.g. 10 digits after decimal point). Note + * that we always generate at least one digit, even if + * the digit is below the cut-off point already. + */ + + for (;;) { + DUK_DDD(DUK_DDDPRINT("generate loop, count=%ld, k=%ld, B=%ld, low_ok=%ld, high_ok=%ld", + (long) count, (long) nc_ctx->k, (long) nc_ctx->B, + (long) nc_ctx->low_ok, (long) nc_ctx->high_ok)); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("m+", &nc_ctx->mp); + DUK__BI_PRINT("m-", &nc_ctx->mm); + + /* (quotient-remainder (* r B) s) using a dummy subtraction loop */ + duk__bi_mul_small(&nc_ctx->t1, &nc_ctx->r, (duk_uint32_t) nc_ctx->B); /* t1 <- (* r B) */ + d = 0; + for (;;) { + if (duk__bi_compare(&nc_ctx->t1, &nc_ctx->s) < 0) { + break; + } + duk__bi_sub_copy(&nc_ctx->t1, &nc_ctx->s, &nc_ctx->t2); /* t1 <- t1 - s */ + d++; + } + duk__bi_copy(&nc_ctx->r, &nc_ctx->t1); /* r <- (remainder (* r B) s) */ + /* d <- (quotient (* r B) s) (in range 0...B-1) */ + DUK_DDD(DUK_DDDPRINT("-> d(quot)=%ld", (long) d)); + DUK__BI_PRINT("r(rem)", &nc_ctx->r); + + duk__bi_mul_small_copy(&nc_ctx->mp, (duk_uint32_t) nc_ctx->B, &nc_ctx->t2); /* m+ <- (* m+ B) */ + duk__bi_mul_small_copy(&nc_ctx->mm, (duk_uint32_t) nc_ctx->B, &nc_ctx->t2); /* m- <- (* m- B) */ + DUK__BI_PRINT("mp(upd)", &nc_ctx->mp); + DUK__BI_PRINT("mm(upd)", &nc_ctx->mm); + + /* Terminating conditions. For fixed width output, we just ignore the + * terminating conditions (and pretend that tc1 == tc2 == false). The + * the current shortcut for fixed-format output is to generate a few + * extra digits and use rounding (with carry) to finish the output. + */ + + if (nc_ctx->is_fixed == 0) { + /* free-form */ + tc1 = (duk__bi_compare(&nc_ctx->r, &nc_ctx->mm) <= (nc_ctx->low_ok ? 0 : -1)); + + duk__bi_add(&nc_ctx->t1, &nc_ctx->r, &nc_ctx->mp); /* t1 <- (+ r m+) */ + tc2 = (duk__bi_compare(&nc_ctx->t1, &nc_ctx->s) >= (nc_ctx->high_ok ? 0 : 1)); + + DUK_DDD(DUK_DDDPRINT("tc1=%ld, tc2=%ld", (long) tc1, (long) tc2)); + } else { + /* fixed-format */ + tc1 = 0; + tc2 = 0; + } + + /* Count is incremented before DUK__DRAGON4_OUTPUT_PREINC() call + * on purpose, which is taken into account by the macro. + */ + count++; + + if (tc1) { + if (tc2) { + /* tc1 = true, tc2 = true */ + duk__bi_mul_small(&nc_ctx->t1, &nc_ctx->r, 2); + if (duk__bi_compare(&nc_ctx->t1, &nc_ctx->s) < 0) { /* (< (* r 2) s) */ + DUK_DDD(DUK_DDDPRINT("tc1=true, tc2=true, 2r > s: output d --> %ld (k=%ld)", + (long) d, (long) nc_ctx->k)); + DUK__DRAGON4_OUTPUT_PREINC(nc_ctx, count, d); + } else { + DUK_DDD(DUK_DDDPRINT("tc1=true, tc2=true, 2r <= s: output d+1 --> %ld (k=%ld)", + (long) (d + 1), (long) nc_ctx->k)); + DUK__DRAGON4_OUTPUT_PREINC(nc_ctx, count, d + 1); + } + break; + } else { + /* tc1 = true, tc2 = false */ + DUK_DDD(DUK_DDDPRINT("tc1=true, tc2=false: output d --> %ld (k=%ld)", + (long) d, (long) nc_ctx->k)); + DUK__DRAGON4_OUTPUT_PREINC(nc_ctx, count, d); + break; + } + } else { + if (tc2) { + /* tc1 = false, tc2 = true */ + DUK_DDD(DUK_DDDPRINT("tc1=false, tc2=true: output d+1 --> %ld (k=%ld)", + (long) (d + 1), (long) nc_ctx->k)); + DUK__DRAGON4_OUTPUT_PREINC(nc_ctx, count, d + 1); + break; + } else { + /* tc1 = false, tc2 = false */ + DUK_DDD(DUK_DDDPRINT("tc1=false, tc2=false: output d --> %ld (k=%ld)", + (long) d, (long) nc_ctx->k)); + DUK__DRAGON4_OUTPUT_PREINC(nc_ctx, count, d); + + /* r <- r (updated above: r <- (remainder (* r B) s) + * s <- s + * m+ <- m+ (updated above: m+ <- (* m+ B) + * m- <- m- (updated above: m- <- (* m- B) + * B, low_ok, high_ok are fixed + */ + + /* fall through and continue for-loop */ + } + } + + /* fixed-format termination conditions */ + if (nc_ctx->is_fixed) { + if (nc_ctx->abs_pos) { + int pos = nc_ctx->k - count + 1; /* count is already incremented, take into account */ + DUK_DDD(DUK_DDDPRINT("fixed format, absolute: abs pos=%ld, k=%ld, count=%ld, req=%ld", + (long) pos, (long) nc_ctx->k, (long) count, (long) nc_ctx->req_digits)); + if (pos <= nc_ctx->req_digits) { + DUK_DDD(DUK_DDDPRINT("digit position reached req_digits, end generate loop")); + break; + } + } else { + DUK_DDD(DUK_DDDPRINT("fixed format, relative: k=%ld, count=%ld, req=%ld", + (long) nc_ctx->k, (long) count, (long) nc_ctx->req_digits)); + if (count >= nc_ctx->req_digits) { + DUK_DDD(DUK_DDDPRINT("digit count reached req_digits, end generate loop")); + break; + } + } + } + } /* for */ + + nc_ctx->count = count; + + DUK_DDD(DUK_DDDPRINT("generate finished")); + +#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 2) + { + duk_uint8_t buf[2048]; + duk_small_int_t i, t; + duk_memzero(buf, sizeof(buf)); + for (i = 0; i < nc_ctx->count; i++) { + t = nc_ctx->digits[i]; + if (t < 0 || t > 36) { + buf[i] = (duk_uint8_t) '?'; + } else { + buf[i] = (duk_uint8_t) DUK__DIGITCHAR(t); + } + } + DUK_DDD(DUK_DDDPRINT("-> generated digits; k=%ld, digits='%s'", + (long) nc_ctx->k, (const char *) buf)); + } +#endif +} + +/* Round up digits to a given position. If position is out-of-bounds, + * does nothing. If carry propagates over the first digit, a '1' is + * prepended to digits and 'k' will be updated. Return value indicates + * whether carry propagated over the first digit. + * + * Note that nc_ctx->count is NOT updated based on the rounding position + * (it is updated only if carry overflows over the first digit and an + * extra digit is prepended). + */ +DUK_LOCAL duk_small_int_t duk__dragon4_fixed_format_round(duk__numconv_stringify_ctx *nc_ctx, duk_small_int_t round_idx) { + duk_small_int_t t; + duk_uint8_t *p; + duk_uint8_t roundup_limit; + duk_small_int_t ret = 0; + + /* + * round_idx points to the digit which is considered for rounding; the + * digit to its left is the final digit of the rounded value. If round_idx + * is zero, rounding will be performed; the result will either be an empty + * rounded value or if carry happens a '1' digit is generated. + */ + + if (round_idx >= nc_ctx->count) { + DUK_DDD(DUK_DDDPRINT("round_idx out of bounds (%ld >= %ld (count)) -> no rounding", + (long) round_idx, (long) nc_ctx->count)); + return 0; + } else if (round_idx < 0) { + DUK_DDD(DUK_DDDPRINT("round_idx out of bounds (%ld < 0) -> no rounding", + (long) round_idx)); + return 0; + } + + /* + * Round-up limit. + * + * For even values, divides evenly, e.g. 10 -> roundup_limit=5. + * + * For odd values, rounds up, e.g. 3 -> roundup_limit=2. + * If radix is 3, 0/3 -> down, 1/3 -> down, 2/3 -> up. + */ + roundup_limit = (duk_uint8_t) ((nc_ctx->B + 1) / 2); + + p = &nc_ctx->digits[round_idx]; + if (*p >= roundup_limit) { + DUK_DDD(DUK_DDDPRINT("fixed-format rounding carry required")); + /* carry */ + for (;;) { + *p = 0; + if (p == &nc_ctx->digits[0]) { + DUK_DDD(DUK_DDDPRINT("carry propagated to first digit -> special case handling")); + duk_memmove((void *) (&nc_ctx->digits[1]), + (const void *) (&nc_ctx->digits[0]), + (size_t) (sizeof(char) * (size_t) nc_ctx->count)); + nc_ctx->digits[0] = 1; /* don't increase 'count' */ + nc_ctx->k++; /* position of highest digit changed */ + nc_ctx->count++; /* number of digits changed */ + ret = 1; + break; + } + + DUK_DDD(DUK_DDDPRINT("fixed-format rounding carry: B=%ld, roundup_limit=%ld, p=%p, digits=%p", + (long) nc_ctx->B, (long) roundup_limit, (void *) p, (void *) nc_ctx->digits)); + p--; + t = *p; + DUK_DDD(DUK_DDDPRINT("digit before carry: %ld", (long) t)); + if (++t < nc_ctx->B) { + DUK_DDD(DUK_DDDPRINT("rounding carry terminated")); + *p = (duk_uint8_t) t; + break; + } + + DUK_DDD(DUK_DDDPRINT("wraps, carry to next digit")); + } + } + + return ret; +} + +#define DUK__NO_EXP (65536) /* arbitrary marker, outside valid exp range */ + +DUK_LOCAL void duk__dragon4_convert_and_push(duk__numconv_stringify_ctx *nc_ctx, + duk_hthread *thr, + duk_small_int_t radix, + duk_small_int_t digits, + duk_small_uint_t flags, + duk_small_int_t neg) { + duk_small_int_t k; + duk_small_int_t pos, pos_end; + duk_small_int_t expt; + duk_small_int_t dig; + duk_uint8_t *q; + duk_uint8_t *buf; + + /* + * The string conversion here incorporates all the necessary ECMAScript + * semantics without attempting to be generic. nc_ctx->digits contains + * nc_ctx->count digits (>= 1), with the topmost digit's 'position' + * indicated by nc_ctx->k as follows: + * + * digits="123" count=3 k=0 --> 0.123 + * digits="123" count=3 k=1 --> 1.23 + * digits="123" count=3 k=5 --> 12300 + * digits="123" count=3 k=-1 --> 0.0123 + * + * Note that the identifier names used for format selection are different + * in Burger-Dybvig paper and ECMAScript specification (quite confusingly + * so, because e.g. 'k' has a totally different meaning in each). See + * documentation for discussion. + * + * ECMAScript doesn't specify any specific behavior for format selection + * (e.g. when to use exponent notation) for non-base-10 numbers. + * + * The bigint space in the context is reused for string output, as there + * is more than enough space for that (>1kB at the moment), and we avoid + * allocating even more stack. + */ + + DUK_ASSERT(DUK__NUMCONV_CTX_BIGINTS_SIZE >= DUK__MAX_FORMATTED_LENGTH); + DUK_ASSERT(nc_ctx->count >= 1); + + k = nc_ctx->k; + buf = (duk_uint8_t *) &nc_ctx->f; /* XXX: union would be more correct */ + q = buf; + + /* Exponent handling: if exponent format is used, record exponent value and + * fake k such that one leading digit is generated (e.g. digits=123 -> "1.23"). + * + * toFixed() prevents exponent use; otherwise apply a set of criteria to + * match the other API calls (toString(), toPrecision, etc). + */ + + expt = DUK__NO_EXP; + if (!nc_ctx->abs_pos /* toFixed() */) { + if ((flags & DUK_N2S_FLAG_FORCE_EXP) || /* exponential notation forced */ + ((flags & DUK_N2S_FLAG_NO_ZERO_PAD) && /* fixed precision and zero padding would be required */ + (k - digits >= 1)) || /* (e.g. k=3, digits=2 -> "12X") */ + ((k > 21 || k <= -6) && (radix == 10))) { /* toString() conditions */ + DUK_DDD(DUK_DDDPRINT("use exponential notation: k=%ld -> expt=%ld", + (long) k, (long) (k - 1))); + expt = k - 1; /* e.g. 12.3 -> digits="123" k=2 -> 1.23e1 */ + k = 1; /* generate mantissa with a single leading whole number digit */ + } + } + + if (neg) { + *q++ = '-'; + } + + /* Start position (inclusive) and end position (exclusive) */ + pos = (k >= 1 ? k : 1); + if (nc_ctx->is_fixed) { + if (nc_ctx->abs_pos) { + /* toFixed() */ + pos_end = -digits; + } else { + pos_end = k - digits; + } + } else { + pos_end = k - nc_ctx->count; + } + if (pos_end > 0) { + pos_end = 0; + } + + DUK_DDD(DUK_DDDPRINT("expt=%ld, k=%ld, count=%ld, pos=%ld, pos_end=%ld, is_fixed=%ld, " + "digits=%ld, abs_pos=%ld", + (long) expt, (long) k, (long) nc_ctx->count, (long) pos, (long) pos_end, + (long) nc_ctx->is_fixed, (long) digits, (long) nc_ctx->abs_pos)); + + /* Digit generation */ + while (pos > pos_end) { + DUK_DDD(DUK_DDDPRINT("digit generation: pos=%ld, pos_end=%ld", + (long) pos, (long) pos_end)); + if (pos == 0) { + *q++ = (duk_uint8_t) '.'; + } + if (pos > k) { + *q++ = (duk_uint8_t) '0'; + } else if (pos <= k - nc_ctx->count) { + *q++ = (duk_uint8_t) '0'; + } else { + dig = nc_ctx->digits[k - pos]; + DUK_ASSERT(dig >= 0 && dig < nc_ctx->B); + *q++ = (duk_uint8_t) DUK__DIGITCHAR(dig); + } + + pos--; + } + DUK_ASSERT(pos <= 1); + + /* Exponent */ + if (expt != DUK__NO_EXP) { + /* + * Exponent notation for non-base-10 numbers isn't specified in ECMAScript + * specification, as it never explicitly turns up: non-decimal numbers can + * only be formatted with Number.prototype.toString([radix]) and for that, + * behavior is not explicitly specified. + * + * Logical choices include formatting the exponent as decimal (e.g. binary + * 100000 as 1e+5) or in current radix (e.g. binary 100000 as 1e+101). + * The Dragon4 algorithm (in the original paper) prints the exponent value + * in the target radix B. However, for radix values 15 and above, the + * exponent separator 'e' is no longer easily parseable. Consider, for + * instance, the number "1.faecee+1c". + */ + + duk_size_t len; + char expt_sign; + + *q++ = 'e'; + if (expt >= 0) { + expt_sign = '+'; + } else { + expt_sign = '-'; + expt = -expt; + } + *q++ = (duk_uint8_t) expt_sign; + len = duk__dragon4_format_uint32(q, (duk_uint32_t) expt, radix); + q += len; + } + + duk_push_lstring(thr, (const char *) buf, (size_t) (q - buf)); +} + +/* + * Conversion helpers + */ + +DUK_LOCAL void duk__dragon4_double_to_ctx(duk__numconv_stringify_ctx *nc_ctx, duk_double_t x) { + duk_double_union u; + duk_uint32_t tmp; + duk_small_int_t expt; + + /* + * seeeeeee eeeeffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff + * A B C D E F G H + * + * s sign bit + * eee... exponent field + * fff... fraction + * + * ieee value = 1.ffff... * 2^(e - 1023) (normal) + * = 0.ffff... * 2^(-1022) (denormal) + * + * algorithm v = f * b^e + */ + + DUK_DBLUNION_SET_DOUBLE(&u, x); + + nc_ctx->f.n = 2; + + tmp = DUK_DBLUNION_GET_LOW32(&u); + nc_ctx->f.v[0] = tmp; + tmp = DUK_DBLUNION_GET_HIGH32(&u); + nc_ctx->f.v[1] = tmp & 0x000fffffUL; + expt = (duk_small_int_t) ((tmp >> 20) & 0x07ffUL); + + if (expt == 0) { + /* denormal */ + expt = DUK__IEEE_DOUBLE_EXP_MIN - 52; + duk__bi_normalize(&nc_ctx->f); + } else { + /* normal: implicit leading 1-bit */ + nc_ctx->f.v[1] |= 0x00100000UL; + expt = expt - DUK__IEEE_DOUBLE_EXP_BIAS - 52; + DUK_ASSERT(duk__bi_is_valid(&nc_ctx->f)); /* true, because v[1] has at least one bit set */ + } + + DUK_ASSERT(duk__bi_is_valid(&nc_ctx->f)); + + nc_ctx->e = expt; +} + +DUK_LOCAL void duk__dragon4_ctx_to_double(duk__numconv_stringify_ctx *nc_ctx, duk_double_t *x) { + duk_double_union u; + duk_small_int_t expt; + duk_small_int_t i; + duk_small_int_t bitstart; + duk_small_int_t bitround; + duk_small_int_t bitidx; + duk_small_int_t skip_round; + duk_uint32_t t, v; + + DUK_ASSERT(nc_ctx->count == 53 + 1); + + /* Sometimes this assert is not true right now; it will be true after + * rounding. See: test-bug-numconv-mantissa-assert.js. + */ + DUK_ASSERT_DISABLE(nc_ctx->digits[0] == 1); /* zero handled by caller */ + + /* Should not be required because the code below always sets both high + * and low parts, but at least gcc-4.4.5 fails to deduce this correctly + * (perhaps because the low part is set (seemingly) conditionally in a + * loop), so this is here to avoid the bogus warning. + */ + duk_memzero((void *) &u, sizeof(u)); + + /* + * Figure out how generated digits match up with the mantissa, + * and then perform rounding. If mantissa overflows, need to + * recompute the exponent (it is bumped and may overflow to + * infinity). + * + * For normal numbers the leading '1' is hidden and ignored, + * and the last bit is used for rounding: + * + * rounding pt + * <--------52------->| + * 1 x x x x ... x x x x|y ==> x x x x ... x x x x + * + * For denormals, the leading '1' is included in the number, + * and the rounding point is different: + * + * rounding pt + * <--52 or less--->| + * 1 x x x x ... x x|x x y ==> 0 0 ... 1 x x ... x x + * + * The largest denormals will have a mantissa beginning with + * a '1' (the explicit leading bit); smaller denormals will + * have leading zero bits. + * + * If the exponent would become too high, the result becomes + * Infinity. If the exponent is so small that the entire + * mantissa becomes zero, the result becomes zero. + * + * Note: the Dragon4 'k' is off-by-one with respect to the IEEE + * exponent. For instance, k==0 indicates that the leading '1' + * digit is at the first binary fraction position (0.1xxx...); + * the corresponding IEEE exponent would be -1. + */ + + skip_round = 0; + + recheck_exp: + + expt = nc_ctx->k - 1; /* IEEE exp without bias */ + if (expt > 1023) { + /* Infinity */ + bitstart = -255; /* needed for inf: causes mantissa to become zero, + * and rounding to be skipped. + */ + expt = 2047; + } else if (expt >= -1022) { + /* normal */ + bitstart = 1; /* skip leading digit */ + expt += DUK__IEEE_DOUBLE_EXP_BIAS; + DUK_ASSERT(expt >= 1 && expt <= 2046); + } else { + /* denormal or zero */ + bitstart = 1023 + expt; /* expt==-1023 -> bitstart=0 (leading 1); + * expt==-1024 -> bitstart=-1 (one left of leading 1), etc + */ + expt = 0; + } + bitround = bitstart + 52; + + DUK_DDD(DUK_DDDPRINT("ieee expt=%ld, bitstart=%ld, bitround=%ld", + (long) expt, (long) bitstart, (long) bitround)); + + if (!skip_round) { + if (duk__dragon4_fixed_format_round(nc_ctx, bitround)) { + /* Corner case: see test-numconv-parse-mant-carry.js. We could + * just bump the exponent and update bitstart, but it's more robust + * to recompute (but avoid rounding twice). + */ + DUK_DDD(DUK_DDDPRINT("rounding caused exponent to be bumped, recheck exponent")); + skip_round = 1; + goto recheck_exp; + } + } + + /* + * Create mantissa + */ + + t = 0; + for (i = 0; i < 52; i++) { + bitidx = bitstart + 52 - 1 - i; + if (bitidx >= nc_ctx->count) { + v = 0; + } else if (bitidx < 0) { + v = 0; + } else { + v = nc_ctx->digits[bitidx]; + } + DUK_ASSERT(v == 0 || v == 1); + t += v << (i % 32); + if (i == 31) { + /* low 32 bits is complete */ + DUK_DBLUNION_SET_LOW32(&u, t); + t = 0; + } + } + /* t has high mantissa */ + + DUK_DDD(DUK_DDDPRINT("mantissa is complete: %08lx %08lx", + (unsigned long) t, + (unsigned long) DUK_DBLUNION_GET_LOW32(&u))); + + DUK_ASSERT(expt >= 0 && expt <= 0x7ffL); + t += ((duk_uint32_t) expt) << 20; +#if 0 /* caller handles sign change */ + if (negative) { + t |= 0x80000000U; + } +#endif + DUK_DBLUNION_SET_HIGH32(&u, t); + + DUK_DDD(DUK_DDDPRINT("number is complete: %08lx %08lx", + (unsigned long) DUK_DBLUNION_GET_HIGH32(&u), + (unsigned long) DUK_DBLUNION_GET_LOW32(&u))); + + *x = DUK_DBLUNION_GET_DOUBLE(&u); +} + +/* + * Exposed number-to-string API + * + * Input: [ number ] + * Output: [ string ] + */ + +DUK_INTERNAL void duk_numconv_stringify(duk_hthread *thr, duk_small_int_t radix, duk_small_int_t digits, duk_small_uint_t flags) { + duk_double_t x; + duk_small_int_t c; + duk_small_int_t neg; + duk_uint32_t uval; + duk__numconv_stringify_ctx nc_ctx_alloc; /* large context; around 2kB now */ + duk__numconv_stringify_ctx *nc_ctx = &nc_ctx_alloc; + + x = (duk_double_t) duk_require_number(thr, -1); + duk_pop(thr); + + /* + * Handle special cases (NaN, infinity, zero). + */ + + c = (duk_small_int_t) DUK_FPCLASSIFY(x); + if (DUK_SIGNBIT((double) x)) { + x = -x; + neg = 1; + } else { + neg = 0; + } + + /* NaN sign bit is platform specific with unpacked, un-normalized NaNs */ + DUK_ASSERT(c == DUK_FP_NAN || DUK_SIGNBIT((double) x) == 0); + + if (c == DUK_FP_NAN) { + duk_push_hstring_stridx(thr, DUK_STRIDX_NAN); + return; + } else if (c == DUK_FP_INFINITE) { + if (neg) { + /* -Infinity */ + duk_push_hstring_stridx(thr, DUK_STRIDX_MINUS_INFINITY); + } else { + /* Infinity */ + duk_push_hstring_stridx(thr, DUK_STRIDX_INFINITY); + } + return; + } else if (c == DUK_FP_ZERO) { + /* We can't shortcut zero here if it goes through special formatting + * (such as forced exponential notation). + */ + ; + } + + /* + * Handle integers in 32-bit range (that is, [-(2**32-1),2**32-1]) + * specially, as they're very likely for embedded programs. This + * is now done for all radix values. We must be careful not to use + * the fast path when special formatting (e.g. forced exponential) + * is in force. + * + * XXX: could save space by supporting radix 10 only and using + * sprintf "%lu" for the fast path and for exponent formatting. + */ + + uval = duk_double_to_uint32_t(x); + if (((double) uval) == x && /* integer number in range */ + flags == 0) { /* no special formatting */ + /* use bigint area as a temp */ + duk_uint8_t *buf = (duk_uint8_t *) (&nc_ctx->f); + duk_uint8_t *p = buf; + + DUK_ASSERT(DUK__NUMCONV_CTX_BIGINTS_SIZE >= 32 + 1); /* max size: radix=2 + sign */ + if (neg && uval != 0) { + /* no negative sign for zero */ + *p++ = (duk_uint8_t) '-'; + } + p += duk__dragon4_format_uint32(p, uval, radix); + duk_push_lstring(thr, (const char *) buf, (duk_size_t) (p - buf)); + return; + } + + /* + * Dragon4 setup. + * + * Convert double from IEEE representation for conversion; + * normal finite values have an implicit leading 1-bit. The + * slow path algorithm doesn't handle zero, so zero is special + * cased here but still creates a valid nc_ctx, and goes + * through normal formatting in case special formatting has + * been requested (e.g. forced exponential format: 0 -> "0e+0"). + */ + + /* Would be nice to bulk clear the allocation, but the context + * is 1-2 kilobytes and nothing should rely on it being zeroed. + */ +#if 0 + duk_memzero((void *) nc_ctx, sizeof(*nc_ctx)); /* slow init, do only for slow path cases */ +#endif + + nc_ctx->is_s2n = 0; + nc_ctx->b = 2; + nc_ctx->B = radix; + nc_ctx->abs_pos = 0; + if (flags & DUK_N2S_FLAG_FIXED_FORMAT) { + nc_ctx->is_fixed = 1; + if (flags & DUK_N2S_FLAG_FRACTION_DIGITS) { + /* absolute req_digits; e.g. digits = 1 -> last digit is 0, + * but add an extra digit for rounding. + */ + nc_ctx->abs_pos = 1; + nc_ctx->req_digits = (-digits + 1) - 1; + } else { + nc_ctx->req_digits = digits + 1; + } + } else { + nc_ctx->is_fixed = 0; + nc_ctx->req_digits = 0; + } + + if (c == DUK_FP_ZERO) { + /* Zero special case: fake requested number of zero digits; ensure + * no sign bit is printed. Relative and absolute fixed format + * require separate handling. + */ + duk_small_int_t count; + if (nc_ctx->is_fixed) { + if (nc_ctx->abs_pos) { + count = digits + 2; /* lead zero + 'digits' fractions + 1 for rounding */ + } else { + count = digits + 1; /* + 1 for rounding */ + } + } else { + count = 1; + } + DUK_DDD(DUK_DDDPRINT("count=%ld", (long) count)); + DUK_ASSERT(count >= 1); + duk_memzero((void *) nc_ctx->digits, (size_t) count); + nc_ctx->count = count; + nc_ctx->k = 1; /* 0.000... */ + neg = 0; + goto zero_skip; + } + + duk__dragon4_double_to_ctx(nc_ctx, x); /* -> sets 'f' and 'e' */ + DUK__BI_PRINT("f", &nc_ctx->f); + DUK_DDD(DUK_DDDPRINT("e=%ld", (long) nc_ctx->e)); + + /* + * Dragon4 slow path digit generation. + */ + + duk__dragon4_prepare(nc_ctx); /* setup many variables in nc_ctx */ + + DUK_DDD(DUK_DDDPRINT("after prepare:")); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("mp", &nc_ctx->mp); + DUK__BI_PRINT("mm", &nc_ctx->mm); + + duk__dragon4_scale(nc_ctx); + + DUK_DDD(DUK_DDDPRINT("after scale; k=%ld", (long) nc_ctx->k)); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("mp", &nc_ctx->mp); + DUK__BI_PRINT("mm", &nc_ctx->mm); + + duk__dragon4_generate(nc_ctx); + + /* + * Convert and push final string. + */ + + zero_skip: + + if (flags & DUK_N2S_FLAG_FIXED_FORMAT) { + /* Perform fixed-format rounding. */ + duk_small_int_t roundpos; + if (flags & DUK_N2S_FLAG_FRACTION_DIGITS) { + /* 'roundpos' is relative to nc_ctx->k and increases to the right + * (opposite of how 'k' changes). + */ + roundpos = -digits; /* absolute position for digit considered for rounding */ + roundpos = nc_ctx->k - roundpos; + } else { + roundpos = digits; + } + DUK_DDD(DUK_DDDPRINT("rounding: k=%ld, count=%ld, digits=%ld, roundpos=%ld", + (long) nc_ctx->k, (long) nc_ctx->count, (long) digits, (long) roundpos)); + (void) duk__dragon4_fixed_format_round(nc_ctx, roundpos); + + /* Note: 'count' is currently not adjusted by rounding (i.e. the + * digits are not "chopped off". That shouldn't matter because + * the digit position (absolute or relative) is passed on to the + * convert-and-push function. + */ + } + + duk__dragon4_convert_and_push(nc_ctx, thr, radix, digits, flags, neg); +} + +/* + * Exposed string-to-number API + * + * Input: [ string ] + * Output: [ number ] + * + * If number parsing fails, a NaN is pushed as the result. If number parsing + * fails due to an internal error, an InternalError is thrown. + */ + +DUK_INTERNAL void duk_numconv_parse(duk_hthread *thr, duk_small_int_t radix, duk_small_uint_t flags) { + duk__numconv_stringify_ctx nc_ctx_alloc; /* large context; around 2kB now */ + duk__numconv_stringify_ctx *nc_ctx = &nc_ctx_alloc; + duk_double_t res; + duk_hstring *h_str; + duk_int_t expt; + duk_bool_t expt_neg; + duk_small_int_t expt_adj; + duk_small_int_t neg; + duk_small_int_t dig; + duk_small_int_t dig_whole; + duk_small_int_t dig_lzero; + duk_small_int_t dig_frac; + duk_small_int_t dig_expt; + duk_small_int_t dig_prec; + const duk__exp_limits *explim; + const duk_uint8_t *p; + duk_small_int_t ch; + + DUK_DDD(DUK_DDDPRINT("parse number: %!T, radix=%ld, flags=0x%08lx", + (duk_tval *) duk_get_tval(thr, -1), + (long) radix, (unsigned long) flags)); + + DUK_ASSERT(radix >= 2 && radix <= 36); + DUK_ASSERT(radix - 2 < (duk_small_int_t) sizeof(duk__str2num_digits_for_radix)); + + /* + * Preliminaries: trim, sign, Infinity check + * + * We rely on the interned string having a NUL terminator, which will + * cause a parse failure wherever it is encountered. As a result, we + * don't need separate pointer checks. + * + * There is no special parsing for 'NaN' in the specification although + * 'Infinity' (with an optional sign) is allowed in some contexts. + * Some contexts allow plus/minus sign, while others only allow the + * minus sign (like JSON.parse()). + * + * Automatic hex number detection (leading '0x' or '0X') and octal + * number detection (leading '0' followed by at least one octal digit) + * is done here too. + * + * Symbols are not explicitly rejected here (that's up to the caller). + * If a symbol were passed here, it should ultimately safely fail + * parsing due to a syntax error. + */ + + if (flags & DUK_S2N_FLAG_TRIM_WHITE) { + /* Leading / trailing whitespace is sometimes accepted and + * sometimes not. After white space trimming, all valid input + * characters are pure ASCII. + */ + duk_trim(thr, -1); + } + h_str = duk_require_hstring(thr, -1); + DUK_ASSERT(h_str != NULL); + p = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_str); + + neg = 0; + ch = *p; + if (ch == (duk_small_int_t) '+') { + if ((flags & DUK_S2N_FLAG_ALLOW_PLUS) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: leading plus sign not allowed")); + goto parse_fail; + } + p++; + } else if (ch == (duk_small_int_t) '-') { + if ((flags & DUK_S2N_FLAG_ALLOW_MINUS) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: leading minus sign not allowed")); + goto parse_fail; + } + p++; + neg = 1; + } + + if ((flags & DUK_S2N_FLAG_ALLOW_INF) && DUK_STRNCMP((const char *) p, "Infinity", 8) == 0) { + /* Don't check for Infinity unless the context allows it. + * 'Infinity' is a valid integer literal in e.g. base-36: + * + * parseInt('Infinity', 36) + * 1461559270678 + */ + + if ((flags & DUK_S2N_FLAG_ALLOW_GARBAGE) == 0 && p[8] != DUK_ASC_NUL) { + DUK_DDD(DUK_DDDPRINT("parse failed: trailing garbage after matching 'Infinity' not allowed")); + goto parse_fail; + } else { + res = DUK_DOUBLE_INFINITY; + goto negcheck_and_ret; + } + } + ch = *p; + if (ch == (duk_small_int_t) '0') { + duk_small_int_t detect_radix = 0; + ch = DUK_LOWERCASE_CHAR_ASCII(p[1]); /* 'x' or 'X' -> 'x' */ + if ((flags & DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT) && ch == DUK_ASC_LC_X) { + DUK_DDD(DUK_DDDPRINT("detected 0x/0X hex prefix, changing radix and preventing fractions and exponent")); + detect_radix = 16; +#if 0 + } else if ((flags & DUK_S2N_FLAG_ALLOW_AUTO_LEGACY_OCT_INT) && + (ch >= (duk_small_int_t) '0' && ch <= (duk_small_int_t) '9')) { + DUK_DDD(DUK_DDDPRINT("detected 0n oct prefix, changing radix and preventing fractions and exponent")); + detect_radix = 8; + + /* NOTE: if this legacy octal case is added back, it has + * different flags and 'p' advance so this needs to be + * reworked. + */ + flags |= DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO; /* interpret e.g. '09' as '0', not NaN */ + p += 1; +#endif + } else if ((flags & DUK_S2N_FLAG_ALLOW_AUTO_OCT_INT) && ch == DUK_ASC_LC_O) { + DUK_DDD(DUK_DDDPRINT("detected 0o oct prefix, changing radix and preventing fractions and exponent")); + detect_radix = 8; + } else if ((flags & DUK_S2N_FLAG_ALLOW_AUTO_BIN_INT) && ch == DUK_ASC_LC_B) { + DUK_DDD(DUK_DDDPRINT("detected 0b bin prefix, changing radix and preventing fractions and exponent")); + detect_radix = 2; + } + if (detect_radix > 0) { + radix = detect_radix; + /* Clear empty as zero flag: interpret e.g. '0x' and '0xg' as a NaN (= parse error) */ + flags &= ~(DUK_S2N_FLAG_ALLOW_EXP | DUK_S2N_FLAG_ALLOW_EMPTY_FRAC | + DUK_S2N_FLAG_ALLOW_FRAC | DUK_S2N_FLAG_ALLOW_NAKED_FRAC | + DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO); + flags |= DUK_S2N_FLAG_ALLOW_LEADING_ZERO; /* allow e.g. '0x0009' and '0b00010001' */ + p += 2; + } + } + + /* + * Scan number and setup for Dragon4. + * + * The fast path case is detected during setup: an integer which + * can be converted without rounding, no net exponent. The fast + * path could be implemented as a separate scan, but may not really + * be worth it: the multiplications for building 'f' are not + * expensive when 'f' is small. + * + * The significand ('f') must contain enough bits of (apparent) + * accuracy, so that Dragon4 will generate enough binary output digits. + * For decimal numbers, this means generating a 20-digit significand, + * which should yield enough practical accuracy to parse IEEE doubles. + * In fact, the ECMAScript specification explicitly allows an + * implementation to treat digits beyond 20 as zeroes (and even + * to round the 20th digit upwards). For non-decimal numbers, the + * appropriate number of digits has been precomputed for comparable + * accuracy. + * + * Digit counts: + * + * [ dig_lzero ] + * | + * .+-..---[ dig_prec ]----. + * | || | + * 0000123.456789012345678901234567890e+123456 + * | | | | | | + * `--+--' `------[ dig_frac ]-------' `-+--' + * | | + * [ dig_whole ] [ dig_expt ] + * + * dig_frac and dig_expt are -1 if not present + * dig_lzero is only computed for whole number part + * + * Parsing state + * + * Parsing whole part dig_frac < 0 AND dig_expt < 0 + * Parsing fraction part dig_frac >= 0 AND dig_expt < 0 + * Parsing exponent part dig_expt >= 0 (dig_frac may be < 0 or >= 0) + * + * Note: in case we hit an implementation limit (like exponent range), + * we should throw an error, NOT return NaN or Infinity. Even with + * very large exponent (or significand) values the final result may be + * finite, so NaN/Infinity would be incorrect. + */ + + duk__bi_set_small(&nc_ctx->f, 0); + dig_prec = 0; + dig_lzero = 0; + dig_whole = 0; + dig_frac = -1; + dig_expt = -1; + expt = 0; + expt_adj = 0; /* essentially tracks digit position of lowest 'f' digit */ + expt_neg = 0; + for (;;) { + ch = *p++; + + DUK_DDD(DUK_DDDPRINT("parse digits: p=%p, ch='%c' (%ld), expt=%ld, expt_adj=%ld, " + "dig_whole=%ld, dig_frac=%ld, dig_expt=%ld, dig_lzero=%ld, dig_prec=%ld", + (const void *) p, (int) ((ch >= 0x20 && ch <= 0x7e) ? ch : '?'), (long) ch, + (long) expt, (long) expt_adj, (long) dig_whole, (long) dig_frac, + (long) dig_expt, (long) dig_lzero, (long) dig_prec)); + DUK__BI_PRINT("f", &nc_ctx->f); + + /* Most common cases first. */ + if (ch >= (duk_small_int_t) '0' && ch <= (duk_small_int_t) '9') { + dig = (duk_small_int_t) ch - '0' + 0; + } else if (ch == (duk_small_int_t) '.') { + /* A leading digit is not required in some cases, e.g. accept ".123". + * In other cases (JSON.parse()) a leading digit is required. This + * is checked for after the loop. + */ + if (dig_frac >= 0 || dig_expt >= 0) { + if (flags & DUK_S2N_FLAG_ALLOW_GARBAGE) { + DUK_DDD(DUK_DDDPRINT("garbage termination (invalid period)")); + break; + } else { + DUK_DDD(DUK_DDDPRINT("parse failed: period not allowed")); + goto parse_fail; + } + } + + if ((flags & DUK_S2N_FLAG_ALLOW_FRAC) == 0) { + /* Some contexts don't allow fractions at all; this can't be a + * post-check because the state ('f' and expt) would be incorrect. + */ + if (flags & DUK_S2N_FLAG_ALLOW_GARBAGE) { + DUK_DDD(DUK_DDDPRINT("garbage termination (invalid first period)")); + break; + } else { + DUK_DDD(DUK_DDDPRINT("parse failed: fraction part not allowed")); + } + } + + DUK_DDD(DUK_DDDPRINT("start fraction part")); + dig_frac = 0; + continue; + } else if (ch == (duk_small_int_t) 0) { + DUK_DDD(DUK_DDDPRINT("NUL termination")); + break; + } else if ((flags & DUK_S2N_FLAG_ALLOW_EXP) && + dig_expt < 0 && (ch == (duk_small_int_t) 'e' || ch == (duk_small_int_t) 'E')) { + /* Note: we don't parse back exponent notation for anything else + * than radix 10, so this is not an ambiguous check (e.g. hex + * exponent values may have 'e' either as a significand digit + * or as an exponent separator). + * + * If the exponent separator occurs twice, 'e' will be interpreted + * as a digit (= 14) and will be rejected as an invalid decimal + * digit. + */ + + DUK_DDD(DUK_DDDPRINT("start exponent part")); + + /* Exponent without a sign or with a +/- sign is accepted + * by all call sites (even JSON.parse()). + */ + ch = *p; + if (ch == (duk_small_int_t) '-') { + expt_neg = 1; + p++; + } else if (ch == (duk_small_int_t) '+') { + p++; + } + dig_expt = 0; + continue; + } else if (ch >= (duk_small_int_t) 'a' && ch <= (duk_small_int_t) 'z') { + dig = (duk_small_int_t) (ch - (duk_small_int_t) 'a' + 0x0a); + } else if (ch >= (duk_small_int_t) 'A' && ch <= (duk_small_int_t) 'Z') { + dig = (duk_small_int_t) (ch - (duk_small_int_t) 'A' + 0x0a); + } else { + dig = 255; /* triggers garbage digit check below */ + } + DUK_ASSERT((dig >= 0 && dig <= 35) || dig == 255); + + if (dig >= radix) { + if (flags & DUK_S2N_FLAG_ALLOW_GARBAGE) { + DUK_DDD(DUK_DDDPRINT("garbage termination")); + break; + } else { + DUK_DDD(DUK_DDDPRINT("parse failed: trailing garbage or invalid digit")); + goto parse_fail; + } + } + + if (dig_expt < 0) { + /* whole or fraction digit */ + + if (dig_prec < duk__str2num_digits_for_radix[radix - 2]) { + /* significant from precision perspective */ + + duk_small_int_t f_zero = duk__bi_is_zero(&nc_ctx->f); + if (f_zero && dig == 0) { + /* Leading zero is not counted towards precision digits; not + * in the integer part, nor in the fraction part. + */ + if (dig_frac < 0) { + dig_lzero++; + } + } else { + /* XXX: join these ops (multiply-accumulate), but only if + * code footprint decreases. + */ + duk__bi_mul_small(&nc_ctx->t1, &nc_ctx->f, (duk_uint32_t) radix); + duk__bi_add_small(&nc_ctx->f, &nc_ctx->t1, (duk_uint32_t) dig); + dig_prec++; + } + } else { + /* Ignore digits beyond a radix-specific limit, but note them + * in expt_adj. + */ + expt_adj++; + } + + if (dig_frac >= 0) { + dig_frac++; + expt_adj--; + } else { + dig_whole++; + } + } else { + /* exponent digit */ + + DUK_ASSERT(radix == 10); + expt = expt * radix + dig; + if (expt > DUK_S2N_MAX_EXPONENT) { + /* Impose a reasonable exponent limit, so that exp + * doesn't need to get tracked using a bigint. + */ + DUK_DDD(DUK_DDDPRINT("parse failed: exponent too large")); + goto parse_explimit_error; + } + dig_expt++; + } + } + + /* Leading zero. */ + + if (dig_lzero > 0 && dig_whole > 1) { + if ((flags & DUK_S2N_FLAG_ALLOW_LEADING_ZERO) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: leading zeroes not allowed in integer part")); + goto parse_fail; + } + } + + /* Validity checks for various fraction formats ("0.1", ".1", "1.", "."). */ + + if (dig_whole == 0) { + if (dig_frac == 0) { + /* "." is not accepted in any format */ + DUK_DDD(DUK_DDDPRINT("parse failed: plain period without leading or trailing digits")); + goto parse_fail; + } else if (dig_frac > 0) { + /* ".123" */ + if ((flags & DUK_S2N_FLAG_ALLOW_NAKED_FRAC) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: fraction part not allowed without " + "leading integer digit(s)")); + goto parse_fail; + } + } else { + /* empty ("") is allowed in some formats (e.g. Number(''), as zero */ + if ((flags & DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: empty string not allowed (as zero)")); + goto parse_fail; + } + } + } else { + if (dig_frac == 0) { + /* "123." is allowed in some formats */ + if ((flags & DUK_S2N_FLAG_ALLOW_EMPTY_FRAC) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: empty fractions")); + goto parse_fail; + } + } else if (dig_frac > 0) { + /* "123.456" */ + ; + } else { + /* "123" */ + ; + } + } + + /* Exponent without digits (e.g. "1e" or "1e+"). If trailing garbage is + * allowed, ignore exponent part as garbage (= parse as "1", i.e. exp 0). + */ + + if (dig_expt == 0) { + if ((flags & DUK_S2N_FLAG_ALLOW_GARBAGE) == 0) { + DUK_DDD(DUK_DDDPRINT("parse failed: empty exponent")); + goto parse_fail; + } + DUK_ASSERT(expt == 0); + } + + if (expt_neg) { + expt = -expt; + } + DUK_DDD(DUK_DDDPRINT("expt=%ld, expt_adj=%ld, net exponent -> %ld", + (long) expt, (long) expt_adj, (long) (expt + expt_adj))); + expt += expt_adj; + + /* Fast path check. */ + + if (nc_ctx->f.n <= 1 && /* 32-bit value */ + expt == 0 /* no net exponent */) { + /* Fast path is triggered for no exponent and also for balanced exponent + * and fraction parts, e.g. for "1.23e2" == "123". Remember to respect + * zero sign. + */ + + /* XXX: could accept numbers larger than 32 bits, e.g. up to 53 bits? */ + DUK_DDD(DUK_DDDPRINT("fast path number parse")); + if (nc_ctx->f.n == 1) { + res = (double) nc_ctx->f.v[0]; + } else { + res = 0.0; + } + goto negcheck_and_ret; + } + + /* Significand ('f') padding. */ + + while (dig_prec < duk__str2num_digits_for_radix[radix - 2]) { + /* Pad significand with "virtual" zero digits so that Dragon4 will + * have enough (apparent) precision to work with. + */ + DUK_DDD(DUK_DDDPRINT("dig_prec=%ld, pad significand with zero", (long) dig_prec)); + duk__bi_mul_small_copy(&nc_ctx->f, (duk_uint32_t) radix, &nc_ctx->t1); + DUK__BI_PRINT("f", &nc_ctx->f); + expt--; + dig_prec++; + } + + DUK_DDD(DUK_DDDPRINT("final exponent: %ld", (long) expt)); + + /* Detect zero special case. */ + + if (nc_ctx->f.n == 0) { + /* This may happen even after the fast path check, if exponent is + * not balanced (e.g. "0e1"). Remember to respect zero sign. + */ + DUK_DDD(DUK_DDDPRINT("significand is zero")); + res = 0.0; + goto negcheck_and_ret; + } + + + /* Quick reject of too large or too small exponents. This check + * would be incorrect for zero (e.g. "0e1000" is zero, not Infinity) + * so zero check must be above. + */ + + explim = &duk__str2num_exp_limits[radix - 2]; + if (expt > explim->upper) { + DUK_DDD(DUK_DDDPRINT("exponent too large -> infinite")); + res = (duk_double_t) DUK_DOUBLE_INFINITY; + goto negcheck_and_ret; + } else if (expt < explim->lower) { + DUK_DDD(DUK_DDDPRINT("exponent too small -> zero")); + res = (duk_double_t) 0.0; + goto negcheck_and_ret; + } + + nc_ctx->is_s2n = 1; + nc_ctx->e = expt; + nc_ctx->b = radix; + nc_ctx->B = 2; + nc_ctx->is_fixed = 1; + nc_ctx->abs_pos = 0; + nc_ctx->req_digits = 53 + 1; + + DUK__BI_PRINT("f", &nc_ctx->f); + DUK_DDD(DUK_DDDPRINT("e=%ld", (long) nc_ctx->e)); + + /* + * Dragon4 slow path (binary) digit generation. + * An extra digit is generated for rounding. + */ + + duk__dragon4_prepare(nc_ctx); /* setup many variables in nc_ctx */ + + DUK_DDD(DUK_DDDPRINT("after prepare:")); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("mp", &nc_ctx->mp); + DUK__BI_PRINT("mm", &nc_ctx->mm); + + duk__dragon4_scale(nc_ctx); + + DUK_DDD(DUK_DDDPRINT("after scale; k=%ld", (long) nc_ctx->k)); + DUK__BI_PRINT("r", &nc_ctx->r); + DUK__BI_PRINT("s", &nc_ctx->s); + DUK__BI_PRINT("mp", &nc_ctx->mp); + DUK__BI_PRINT("mm", &nc_ctx->mm); + + duk__dragon4_generate(nc_ctx); + + DUK_ASSERT(nc_ctx->count == 53 + 1); + + /* + * Convert binary digits into an IEEE double. Need to handle + * denormals and rounding correctly. + * + * Some call sites currently assume the result is always a + * non-fastint double. If this is changed, check all call + * sites. + */ + + duk__dragon4_ctx_to_double(nc_ctx, &res); + goto negcheck_and_ret; + + negcheck_and_ret: + if (neg) { + res = -res; + } + duk_pop(thr); + duk_push_number(thr, (double) res); + DUK_DDD(DUK_DDDPRINT("result: %!T", (duk_tval *) duk_get_tval(thr, -1))); + return; + + parse_fail: + DUK_DDD(DUK_DDDPRINT("parse failed")); + duk_pop(thr); + duk_push_nan(thr); + return; + + parse_explimit_error: + DUK_DDD(DUK_DDDPRINT("parse failed, internal error, can't return a value")); + DUK_ERROR_RANGE(thr, "exponent too large"); + DUK_WO_NORETURN(return;); +} + +/* automatic undefs */ +#undef DUK__BI_MAX_PARTS +#undef DUK__BI_PRINT +#undef DUK__DIGITCHAR +#undef DUK__DRAGON4_OUTPUT_PREINC +#undef DUK__IEEE_DOUBLE_EXP_BIAS +#undef DUK__IEEE_DOUBLE_EXP_MIN +#undef DUK__MAX_FORMATTED_LENGTH +#undef DUK__MAX_OUTPUT_DIGITS +#undef DUK__NO_EXP +#undef DUK__NUMCONV_CTX_BIGINTS_SIZE +#undef DUK__NUMCONV_CTX_NUM_BIGINTS +#line 1 "duk_regexp_compiler.c" +/* + * Regexp compilation. + * + * See doc/regexp.rst for a discussion of the compilation approach and + * current limitations. + * + * Regexp bytecode assumes jumps can be expressed with signed 32-bit + * integers. Consequently the bytecode size must not exceed 0x7fffffffL. + * The implementation casts duk_size_t (buffer size) to duk_(u)int32_t + * in many places. Although this could be changed, the bytecode format + * limit would still prevent regexps exceeding the signed 32-bit limit + * from working. + * + * XXX: The implementation does not prevent bytecode from exceeding the + * maximum supported size. This could be done by limiting the maximum + * input string size (assuming an upper bound can be computed for number + * of bytecode bytes emitted per input byte) or checking buffer maximum + * size when emitting bytecode (slower). + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_REGEXP_SUPPORT) + +/* + * Helper macros + */ + +#define DUK__RE_INITIAL_BUFSIZE 64 + +#define DUK__RE_BUFLEN(re_ctx) \ + DUK_BW_GET_SIZE(re_ctx->thr, &re_ctx->bw) + +/* + * Disjunction struct: result of parsing a disjunction + */ + +typedef struct { + /* Number of characters that the atom matches (e.g. 3 for 'abc'), + * -1 if atom is complex and number of matched characters either + * varies or is not known. + */ + duk_int32_t charlen; + +#if 0 + /* These are not needed to implement quantifier capture handling, + * but might be needed at some point. + */ + + /* re_ctx->captures at start and end of atom parsing. + * Since 'captures' indicates highest capture number emitted + * so far in a DUK_REOP_SAVE, the captures numbers saved by + * the atom are: ]start_captures,end_captures]. + */ + duk_uint32_t start_captures; + duk_uint32_t end_captures; +#endif +} duk__re_disjunction_info; + +/* + * Encoding helpers + * + * Some of the typing is bytecode based, e.g. slice sizes are unsigned 32-bit + * even though the buffer operations will use duk_size_t. + */ + +/* XXX: the insert helpers should ensure that the bytecode result is not + * larger than expected (or at least assert for it). Many things in the + * bytecode, like skip offsets, won't work correctly if the bytecode is + * larger than say 2G. + */ + +DUK_LOCAL duk_uint32_t duk__encode_i32(duk_int32_t x) { + if (x < 0) { + return ((duk_uint32_t) (-x)) * 2 + 1; + } else { + return ((duk_uint32_t) x) * 2; + } +} + +/* XXX: return type should probably be duk_size_t, or explicit checks are needed for + * maximum size. + */ +DUK_LOCAL duk_uint32_t duk__insert_u32(duk_re_compiler_ctx *re_ctx, duk_uint32_t offset, duk_uint32_t x) { + duk_uint8_t buf[DUK_UNICODE_MAX_XUTF8_LENGTH]; + duk_small_int_t len; + + len = duk_unicode_encode_xutf8((duk_ucodepoint_t) x, buf); + DUK_ASSERT(len >= 0); + DUK_BW_INSERT_ENSURE_BYTES(re_ctx->thr, &re_ctx->bw, offset, buf, (duk_size_t) len); + return (duk_uint32_t) len; +} + +DUK_LOCAL void duk__append_u32(duk_re_compiler_ctx *re_ctx, duk_uint32_t x) { + DUK_BW_WRITE_ENSURE_XUTF8(re_ctx->thr, &re_ctx->bw, x); +} + +DUK_LOCAL void duk__append_7bit(duk_re_compiler_ctx *re_ctx, duk_uint32_t x) { +#if defined(DUK_USE_PREFER_SIZE) + duk__append_u32(re_ctx, x); +#else + DUK_ASSERT(x <= 0x7fU); + DUK_BW_WRITE_ENSURE_U8(re_ctx->thr, &re_ctx->bw, (duk_uint8_t) x); +#endif +} + +#if 0 +DUK_LOCAL void duk__append_2bytes(duk_re_compiler_ctx *re_ctx, duk_uint8_t x, duk_uint8_t y) { + DUK_BW_WRITE_ENSURE_U8_2(re_ctx->thr, &re_ctx->bw, x, y); +} +#endif + +DUK_LOCAL duk_uint32_t duk__insert_i32(duk_re_compiler_ctx *re_ctx, duk_uint32_t offset, duk_int32_t x) { + return duk__insert_u32(re_ctx, offset, duk__encode_i32(x)); +} + +DUK_LOCAL void duk__append_reop(duk_re_compiler_ctx *re_ctx, duk_uint32_t reop) { + DUK_ASSERT(reop <= 0x7fU); + (void) duk__append_7bit(re_ctx, reop); +} + +#if 0 /* unused */ +DUK_LOCAL void duk__append_i32(duk_re_compiler_ctx *re_ctx, duk_int32_t x) { + duk__append_u32(re_ctx, duk__encode_i32(x)); +} +#endif + +/* special helper for emitting u16 lists (used for character ranges for built-in char classes) */ +DUK_LOCAL void duk__append_u16_list(duk_re_compiler_ctx *re_ctx, const duk_uint16_t *values, duk_uint32_t count) { + /* Call sites don't need the result length so it's not accumulated. */ + while (count-- > 0) { + duk__append_u32(re_ctx, (duk_uint32_t) (*values++)); + } +} + +DUK_LOCAL void duk__insert_slice(duk_re_compiler_ctx *re_ctx, duk_uint32_t offset, duk_uint32_t data_offset, duk_uint32_t data_length) { + DUK_BW_INSERT_ENSURE_SLICE(re_ctx->thr, &re_ctx->bw, offset, data_offset, data_length); +} + +DUK_LOCAL void duk__append_slice(duk_re_compiler_ctx *re_ctx, duk_uint32_t data_offset, duk_uint32_t data_length) { + DUK_BW_WRITE_ENSURE_SLICE(re_ctx->thr, &re_ctx->bw, data_offset, data_length); +} + +DUK_LOCAL void duk__remove_slice(duk_re_compiler_ctx *re_ctx, duk_uint32_t data_offset, duk_uint32_t data_length) { + DUK_BW_REMOVE_ENSURE_SLICE(re_ctx->thr, &re_ctx->bw, data_offset, data_length); +} + +/* + * Insert a jump offset at 'offset' to complete an instruction + * (the jump offset is always the last component of an instruction). + * The 'skip' argument must be computed relative to 'offset', + * -without- taking into account the skip field being inserted. + * + * ... A B C ins X Y Z ... (ins may be a JUMP, SPLIT1/SPLIT2, etc) + * => ... A B C ins SKIP X Y Z + * + * Computing the final (adjusted) skip value, which is relative to the + * first byte of the next instruction, is a bit tricky because of the + * variable length UTF-8 encoding. See doc/regexp.rst for discussion. + */ +DUK_LOCAL duk_uint32_t duk__insert_jump_offset(duk_re_compiler_ctx *re_ctx, duk_uint32_t offset, duk_int32_t skip) { +#if 0 + /* Iterative solution. */ + if (skip < 0) { + duk_small_int_t len; + /* two encoding attempts suffices */ + len = duk_unicode_get_xutf8_length((duk_codepoint_t) duk__encode_i32(skip)); + len = duk_unicode_get_xutf8_length((duk_codepoint_t) duk__encode_i32(skip - (duk_int32_t) len)); + DUK_ASSERT(duk_unicode_get_xutf8_length(duk__encode_i32(skip - (duk_int32_t) len)) == len); /* no change */ + skip -= (duk_int32_t) len; + } +#endif + +#if defined(DUK_USE_PREFER_SIZE) + /* Closed form solution, this produces smallest code. + * See re_neg_jump_offset (closed2). + */ + if (skip < 0) { + skip--; + if (skip < -0x3fL) { + skip--; + } + if (skip < -0x3ffL) { + skip--; + } + if (skip < -0x7fffL) { + skip--; + } + if (skip < -0xfffffL) { + skip--; + } + if (skip < -0x1ffffffL) { + skip--; + } + if (skip < -0x3fffffffL) { + skip--; + } + } +#else /* DUK_USE_PREFER_SIZE */ + /* Closed form solution, this produces fastest code. + * See re_neg_jump_offset (closed1). + */ + if (skip < 0) { + if (skip >= -0x3eL) { + skip -= 1; + } else if (skip >= -0x3fdL) { + skip -= 2; + } else if (skip >= -0x7ffcL) { + skip -= 3; + } else if (skip >= -0xffffbL) { + skip -= 4; + } else if (skip >= -0x1fffffaL) { + skip -= 5; + } else if (skip >= -0x3ffffff9L) { + skip -= 6; + } else { + skip -= 7; + } + } +#endif /* DUK_USE_PREFER_SIZE */ + + return duk__insert_i32(re_ctx, offset, skip); +} + +DUK_LOCAL duk_uint32_t duk__append_jump_offset(duk_re_compiler_ctx *re_ctx, duk_int32_t skip) { + return (duk_uint32_t) duk__insert_jump_offset(re_ctx, (duk_uint32_t) DUK__RE_BUFLEN(re_ctx), skip); +} + +/* + * duk_re_range_callback for generating character class ranges. + * + * When ignoreCase is false, the range is simply emitted as is. We don't, + * for instance, eliminate duplicates or overlapping ranges in a character + * class. + * + * When ignoreCase is true but the 'direct' flag is set, the caller knows + * that the range canonicalizes to itself for case insensitive matching, + * so the range is emitted as is. This is mainly useful for built-in ranges + * like \W. + * + * Otherwise, when ignoreCase is true, the range needs to be normalized + * through canonicalization. Unfortunately a canonicalized version of a + * continuous range is not necessarily continuous (e.g. [x-{] is continuous + * but [X-{] is not). As a result, a single input range may expand to a lot + * of output ranges. The current algorithm creates the canonicalized ranges + * footprint efficiently at the cost of compile time execution time; see + * doc/regexp.rst for discussion, and some more details below. + * + * Note that the ctx->nranges is a context-wide temporary value. This is OK + * because there cannot be multiple character classes being parsed + * simultaneously. + * + * More detail on canonicalization: + * + * Conceptually, a range is canonicalized by scanning the entire range, + * normalizing each codepoint by converting it to uppercase, and generating + * a set of result ranges. + * + * Ideally a minimal set of output ranges would be emitted by merging all + * possible ranges even if they're emitted out of sequence. Because the + * input string is also case normalized during matching, some codepoints + * never occur at runtime; these "don't care" codepoints can be included or + * excluded from ranges when merging/optimizing ranges. + * + * The current algorithm does not do optimal range merging. Rather, output + * codepoints are generated in sequence, and when the output codepoints are + * continuous (CP, CP+1, CP+2, ...), they are merged locally into as large a + * range as possible. A small canonicalization bitmap is used to reduce + * actual codepoint canonicalizations which are quite slow at present. The + * bitmap provides a "codepoint block is continuous with respect to + * canonicalization" for N-codepoint blocks. This allows blocks to be + * skipped quickly. + * + * There are a number of shortcomings and future work here: + * + * - Individual codepoint normalizations are slow because they involve + * walking bit-packed rules without a lookup index. + * + * - The conceptual algorithm needs to canonicalize every codepoint in the + * input range to figure out the output range(s). Even with the small + * canonicalization bitmap the algorithm runs quite slowly for worst case + * inputs. There are many data structure alternatives to improve this. + * + * - While the current algorithm generates maximal output ranges when the + * output codepoints are emitted linearly, output ranges are not sorted or + * merged otherwise. In the worst case a lot of ranges are emitted when + * most of the ranges could be merged. In this process one could take + * advantage of "don't care" codepoints, which are never matched against at + * runtime due to canonicalization of input codepoints before comparison, + * to merge otherwise discontinuous output ranges. + * + * - The runtime data structure is just a linear list of ranges to match + * against. This can be quite slow if there are a lot of output ranges. + * There are various ways to make matching against the ranges faster, + * e.g. sorting the ranges and using a binary search; skip lists; tree + * based representations; full or approximate codepoint bitmaps, etc. + * + * - Only BMP is supported, codepoints above BMP are assumed to canonicalize + * to themselves. For now this is one place where we don't want to + * support chars outside the BMP, because the exhaustive search would be + * massively larger. It would be possible to support non-BMP with a + * different algorithm, or perhaps doing case normalization only at match + * time. + */ + +DUK_LOCAL void duk__regexp_emit_range(duk_re_compiler_ctx *re_ctx, duk_codepoint_t r1, duk_codepoint_t r2) { + DUK_ASSERT(r2 >= r1); + duk__append_u32(re_ctx, (duk_uint32_t) r1); + duk__append_u32(re_ctx, (duk_uint32_t) r2); + re_ctx->nranges++; +} + +#if defined(DUK_USE_REGEXP_CANON_BITMAP) +/* Find next canonicalization discontinuity (conservative estimate) starting + * from 'start', not exceeding 'end'. If continuity is fine up to 'end' + * inclusive, returns end. Minimum possible return value is start. + */ +DUK_LOCAL duk_codepoint_t duk__re_canon_next_discontinuity(duk_codepoint_t start, duk_codepoint_t end) { + duk_uint_t start_blk; + duk_uint_t end_blk; + duk_uint_t blk; + duk_uint_t offset; + duk_uint8_t mask; + + /* Inclusive block range. */ + DUK_ASSERT(start >= 0); + DUK_ASSERT(end >= 0); + DUK_ASSERT(end >= start); + start_blk = (duk_uint_t) (start >> DUK_CANON_BITMAP_BLKSHIFT); + end_blk = (duk_uint_t) (end >> DUK_CANON_BITMAP_BLKSHIFT); + + for (blk = start_blk; blk <= end_blk; blk++) { + offset = blk >> 3; + mask = 1U << (blk & 0x07); + if (offset >= sizeof(duk_unicode_re_canon_bitmap)) { + /* Reached non-BMP range which is assumed continuous. */ + return end; + } + DUK_ASSERT(offset < sizeof(duk_unicode_re_canon_bitmap)); + if ((duk_unicode_re_canon_bitmap[offset] & mask) == 0) { + /* Block is discontinuous, continuity is guaranteed + * only up to end of previous block (+1 for exclusive + * return value => start of current block). Start + * block requires special handling. + */ + if (blk > start_blk) { + return (duk_codepoint_t) (blk << DUK_CANON_BITMAP_BLKSHIFT); + } else { + return start; + } + } + } + DUK_ASSERT(blk == end_blk + 1); /* Reached end block which is continuous. */ + return end; +} +#else /* DUK_USE_REGEXP_CANON_BITMAP */ +DUK_LOCAL duk_codepoint_t duk__re_canon_next_discontinuity(duk_codepoint_t start, duk_codepoint_t end) { + DUK_ASSERT(start >= 0); + DUK_ASSERT(end >= 0); + DUK_ASSERT(end >= start); + if (start >= 0x10000) { + /* Even without the bitmap, treat non-BMP as continuous. */ + return end; + } + return start; +} +#endif /* DUK_USE_REGEXP_CANON_BITMAP */ + +DUK_LOCAL void duk__regexp_generate_ranges(void *userdata, duk_codepoint_t r1, duk_codepoint_t r2, duk_bool_t direct) { + duk_re_compiler_ctx *re_ctx = (duk_re_compiler_ctx *) userdata; + duk_codepoint_t r_start; + duk_codepoint_t r_end; + duk_codepoint_t i; + duk_codepoint_t t; + duk_codepoint_t r_disc; + + DUK_DD(DUK_DDPRINT("duk__regexp_generate_ranges(): re_ctx=%p, range=[%ld,%ld] direct=%ld", + (void *) re_ctx, (long) r1, (long) r2, (long) direct)); + + DUK_ASSERT(r2 >= r1); /* SyntaxError for out of order range. */ + + if (direct || (re_ctx->re_flags & DUK_RE_FLAG_IGNORE_CASE) == 0) { + DUK_DD(DUK_DDPRINT("direct or not case sensitive, emit range: [%ld,%ld]", (long) r1, (long) r2)); + duk__regexp_emit_range(re_ctx, r1, r2); + return; + } + + DUK_DD(DUK_DDPRINT("case sensitive, process range: [%ld,%ld]", (long) r1, (long) r2)); + + r_start = duk_unicode_re_canonicalize_char(re_ctx->thr, r1); + r_end = r_start; + + for (i = r1 + 1; i <= r2;) { + /* Input codepoint space processed up to i-1, and + * current range in r_{start,end} is up-to-date + * (inclusive) and may either break or continue. + */ + r_disc = duk__re_canon_next_discontinuity(i, r2); + DUK_ASSERT(r_disc >= i); + DUK_ASSERT(r_disc <= r2); + + r_end += r_disc - i; /* May be zero. */ + t = duk_unicode_re_canonicalize_char(re_ctx->thr, r_disc); + if (t == r_end + 1) { + /* Not actually a discontinuity, continue range + * to r_disc and recheck. + */ + r_end = t; + } else { + duk__regexp_emit_range(re_ctx, r_start, r_end); + r_start = t; + r_end = t; + } + i = r_disc + 1; /* Guarantees progress. */ + } + duk__regexp_emit_range(re_ctx, r_start, r_end); + +#if 0 /* Exhaustive search, very slow. */ + r_start = duk_unicode_re_canonicalize_char(re_ctx->thr, r1); + r_end = r_start; + for (i = r1 + 1; i <= r2; i++) { + t = duk_unicode_re_canonicalize_char(re_ctx->thr, i); + if (t == r_end + 1) { + r_end = t; + } else { + DUK_DD(DUK_DDPRINT("canonicalized, emit range: [%ld,%ld]", (long) r_start, (long) r_end)); + duk__append_u32(re_ctx, (duk_uint32_t) r_start); + duk__append_u32(re_ctx, (duk_uint32_t) r_end); + re_ctx->nranges++; + r_start = t; + r_end = t; + } + } + DUK_DD(DUK_DDPRINT("canonicalized, emit range: [%ld,%ld]", (long) r_start, (long) r_end)); + duk__append_u32(re_ctx, (duk_uint32_t) r_start); + duk__append_u32(re_ctx, (duk_uint32_t) r_end); + re_ctx->nranges++; +#endif +} + +/* + * Parse regexp Disjunction. Most of regexp compilation happens here. + * + * Handles Disjunction, Alternative, and Term productions directly without + * recursion. The only constructs requiring recursion are positive/negative + * lookaheads, capturing parentheses, and non-capturing parentheses. + * + * The function determines whether the entire disjunction is a 'simple atom' + * (see doc/regexp.rst discussion on 'simple quantifiers') and if so, + * returns the atom character length which is needed by the caller to keep + * track of its own atom character length. A disjunction with more than one + * alternative is never considered a simple atom (although in some cases + * that might be the case). + * + * Return value: simple atom character length or < 0 if not a simple atom. + * Appends the bytecode for the disjunction matcher to the end of the temp + * buffer. + * + * Regexp top level structure is: + * + * Disjunction = Term* + * | Term* | Disjunction + * + * Term = Assertion + * | Atom + * | Atom Quantifier + * + * An empty Term sequence is a valid disjunction alternative (e.g. /|||c||/). + * + * Notes: + * + * * Tracking of the 'simple-ness' of the current atom vs. the entire + * disjunction are separate matters. For instance, the disjunction + * may be complex, but individual atoms may be simple. Furthermore, + * simple quantifiers are used whenever possible, even if the + * disjunction as a whole is complex. + * + * * The estimate of whether an atom is simple is conservative now, + * and it would be possible to expand it. For instance, captures + * cause the disjunction to be marked complex, even though captures + * -can- be handled by simple quantifiers with some minor modifications. + * + * * Disjunction 'tainting' as 'complex' is handled at the end of the + * main for loop collectively for atoms. Assertions, quantifiers, + * and '|' tokens need to taint the result manually if necessary. + * Assertions cannot add to result char length, only atoms (and + * quantifiers) can; currently quantifiers will taint the result + * as complex though. + */ + +DUK_LOCAL const duk_uint16_t * const duk__re_range_lookup1[3] = { + duk_unicode_re_ranges_digit, + duk_unicode_re_ranges_white, + duk_unicode_re_ranges_wordchar +}; +DUK_LOCAL const duk_uint8_t duk__re_range_lookup2[3] = { + sizeof(duk_unicode_re_ranges_digit) / (2 * sizeof(duk_uint16_t)), + sizeof(duk_unicode_re_ranges_white) / (2 * sizeof(duk_uint16_t)), + sizeof(duk_unicode_re_ranges_wordchar) / (2 * sizeof(duk_uint16_t)) +}; + +DUK_LOCAL void duk__append_range_atom_matcher(duk_re_compiler_ctx *re_ctx, duk_small_uint_t re_op, const duk_uint16_t *ranges, duk_small_uint_t count) { +#if 0 + DUK_ASSERT(re_op <= 0x7fUL); + DUK_ASSERT(count <= 0x7fUL); + duk__append_2bytes(re_ctx, (duk_uint8_t) re_op, (duk_uint8_t) count); +#endif + duk__append_reop(re_ctx, re_op); + duk__append_7bit(re_ctx, count); + duk__append_u16_list(re_ctx, ranges, count * 2); +} + +DUK_LOCAL void duk__parse_disjunction(duk_re_compiler_ctx *re_ctx, duk_bool_t expect_eof, duk__re_disjunction_info *out_atom_info) { + duk_int32_t atom_start_offset = -1; /* negative -> no atom matched on previous round */ + duk_int32_t atom_char_length = 0; /* negative -> complex atom */ + duk_uint32_t atom_start_captures = re_ctx->captures; /* value of re_ctx->captures at start of atom */ + duk_int32_t unpatched_disjunction_split = -1; + duk_int32_t unpatched_disjunction_jump = -1; + duk_uint32_t entry_offset = (duk_uint32_t) DUK__RE_BUFLEN(re_ctx); + duk_int32_t res_charlen = 0; /* -1 if disjunction is complex, char length if simple */ + duk__re_disjunction_info tmp_disj; + + DUK_ASSERT(out_atom_info != NULL); + + if (re_ctx->recursion_depth >= re_ctx->recursion_limit) { + DUK_ERROR_RANGE(re_ctx->thr, DUK_STR_REGEXP_COMPILER_RECURSION_LIMIT); + DUK_WO_NORETURN(return;); + } + re_ctx->recursion_depth++; + +#if 0 + out_atom_info->start_captures = re_ctx->captures; +#endif + + for (;;) { + /* atom_char_length, atom_start_offset, atom_start_offset reflect the + * atom matched on the previous loop. If a quantifier is encountered + * on this loop, these are needed to handle the quantifier correctly. + * new_atom_char_length etc are for the atom parsed on this round; + * they're written to atom_char_length etc at the end of the round. + */ + duk_int32_t new_atom_char_length; /* char length of the atom parsed in this loop */ + duk_int32_t new_atom_start_offset; /* bytecode start offset of the atom parsed in this loop + * (allows quantifiers to copy the atom bytecode) + */ + duk_uint32_t new_atom_start_captures; /* re_ctx->captures at the start of the atom parsed in this loop */ + + duk_lexer_parse_re_token(&re_ctx->lex, &re_ctx->curr_token); + + DUK_DD(DUK_DDPRINT("re token: %ld (num=%ld, char=%c)", + (long) re_ctx->curr_token.t, + (long) re_ctx->curr_token.num, + (re_ctx->curr_token.num >= 0x20 && re_ctx->curr_token.num <= 0x7e) ? + (int) re_ctx->curr_token.num : (int) '?')); + + /* set by atom case clauses */ + new_atom_start_offset = -1; + new_atom_char_length = -1; + new_atom_start_captures = re_ctx->captures; + + switch (re_ctx->curr_token.t) { + case DUK_RETOK_DISJUNCTION: { + /* + * The handling here is a bit tricky. If a previous '|' has been processed, + * we have a pending split1 and a pending jump (for a previous match). These + * need to be back-patched carefully. See docs for a detailed example. + */ + + /* patch pending jump and split */ + if (unpatched_disjunction_jump >= 0) { + duk_uint32_t offset; + + DUK_ASSERT(unpatched_disjunction_split >= 0); + offset = (duk_uint32_t) unpatched_disjunction_jump; + offset += duk__insert_jump_offset(re_ctx, + offset, + (duk_int32_t) (DUK__RE_BUFLEN(re_ctx) - offset)); + /* offset is now target of the pending split (right after jump) */ + duk__insert_jump_offset(re_ctx, + (duk_uint32_t) unpatched_disjunction_split, + (duk_int32_t) offset - unpatched_disjunction_split); + } + + /* add a new pending split to the beginning of the entire disjunction */ + (void) duk__insert_u32(re_ctx, + entry_offset, + DUK_REOP_SPLIT1); /* prefer direct execution */ + unpatched_disjunction_split = (duk_int32_t) (entry_offset + 1); /* +1 for opcode */ + + /* add a new pending match jump for latest finished alternative */ + duk__append_reop(re_ctx, DUK_REOP_JUMP); + unpatched_disjunction_jump = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + + /* 'taint' result as complex */ + res_charlen = -1; + break; + } + case DUK_RETOK_QUANTIFIER: { + if (atom_start_offset < 0) { + DUK_ERROR_SYNTAX(re_ctx->thr, DUK_STR_INVALID_QUANTIFIER_NO_ATOM); + DUK_WO_NORETURN(return;); + } + if (re_ctx->curr_token.qmin > re_ctx->curr_token.qmax) { + DUK_ERROR_SYNTAX(re_ctx->thr, DUK_STR_INVALID_QUANTIFIER_VALUES); + DUK_WO_NORETURN(return;); + } + if (atom_char_length >= 0) { + /* + * Simple atom + * + * If atom_char_length is zero, we'll have unbounded execution time for e.g. + * /()*x/.exec('x'). We can't just skip the match because it might have some + * side effects (for instance, if we allowed captures in simple atoms, the + * capture needs to happen). The simple solution below is to force the + * quantifier to match at most once, since the additional matches have no effect. + * + * With a simple atom there can be no capture groups, so no captures need + * to be reset. + */ + duk_int32_t atom_code_length; + duk_uint32_t offset; + duk_uint32_t qmin, qmax; + + qmin = re_ctx->curr_token.qmin; + qmax = re_ctx->curr_token.qmax; + if (atom_char_length == 0) { + /* qmin and qmax will be 0 or 1 */ + if (qmin > 1) { + qmin = 1; + } + if (qmax > 1) { + qmax = 1; + } + } + + duk__append_reop(re_ctx, DUK_REOP_MATCH); /* complete 'sub atom' */ + atom_code_length = (duk_int32_t) (DUK__RE_BUFLEN(re_ctx) - (duk_size_t) atom_start_offset); + + offset = (duk_uint32_t) atom_start_offset; + if (re_ctx->curr_token.greedy) { + offset += duk__insert_u32(re_ctx, offset, DUK_REOP_SQGREEDY); + offset += duk__insert_u32(re_ctx, offset, qmin); + offset += duk__insert_u32(re_ctx, offset, qmax); + offset += duk__insert_u32(re_ctx, offset, (duk_uint32_t) atom_char_length); + offset += duk__insert_jump_offset(re_ctx, offset, atom_code_length); + } else { + offset += duk__insert_u32(re_ctx, offset, DUK_REOP_SQMINIMAL); + offset += duk__insert_u32(re_ctx, offset, qmin); + offset += duk__insert_u32(re_ctx, offset, qmax); + offset += duk__insert_jump_offset(re_ctx, offset, atom_code_length); + } + DUK_UNREF(offset); /* silence scan-build warning */ + } else { + /* + * Complex atom + * + * The original code is used as a template, and removed at the end + * (this differs from the handling of simple quantifiers). + * + * NOTE: there is no current solution for empty atoms in complex + * quantifiers. This would need some sort of a 'progress' instruction. + * + * XXX: impose limit on maximum result size, i.e. atom_code_len * atom_copies? + */ + duk_int32_t atom_code_length; + duk_uint32_t atom_copies; + duk_uint32_t tmp_qmin, tmp_qmax; + + /* pre-check how many atom copies we're willing to make (atom_copies not needed below) */ + atom_copies = (re_ctx->curr_token.qmax == DUK_RE_QUANTIFIER_INFINITE) ? + re_ctx->curr_token.qmin : re_ctx->curr_token.qmax; + if (atom_copies > DUK_RE_MAX_ATOM_COPIES) { + DUK_ERROR_RANGE(re_ctx->thr, DUK_STR_QUANTIFIER_TOO_MANY_COPIES); + DUK_WO_NORETURN(return;); + } + + /* wipe the capture range made by the atom (if any) */ + DUK_ASSERT(atom_start_captures <= re_ctx->captures); + if (atom_start_captures != re_ctx->captures) { + DUK_ASSERT(atom_start_captures < re_ctx->captures); + DUK_DDD(DUK_DDDPRINT("must wipe ]atom_start_captures,re_ctx->captures]: ]%ld,%ld]", + (long) atom_start_captures, (long) re_ctx->captures)); + + /* insert (DUK_REOP_WIPERANGE, start, count) in reverse order so the order ends up right */ + duk__insert_u32(re_ctx, (duk_uint32_t) atom_start_offset, (re_ctx->captures - atom_start_captures) * 2U); + duk__insert_u32(re_ctx, (duk_uint32_t) atom_start_offset, (atom_start_captures + 1) * 2); + duk__insert_u32(re_ctx, (duk_uint32_t) atom_start_offset, DUK_REOP_WIPERANGE); + } else { + DUK_DDD(DUK_DDDPRINT("no need to wipe captures: atom_start_captures == re_ctx->captures == %ld", + (long) atom_start_captures)); + } + + atom_code_length = (duk_int32_t) DUK__RE_BUFLEN(re_ctx) - atom_start_offset; + + /* insert the required matches (qmin) by copying the atom */ + tmp_qmin = re_ctx->curr_token.qmin; + tmp_qmax = re_ctx->curr_token.qmax; + while (tmp_qmin > 0) { + duk__append_slice(re_ctx, (duk_uint32_t) atom_start_offset, (duk_uint32_t) atom_code_length); + tmp_qmin--; + if (tmp_qmax != DUK_RE_QUANTIFIER_INFINITE) { + tmp_qmax--; + } + } + DUK_ASSERT(tmp_qmin == 0); + + /* insert code for matching the remainder - infinite or finite */ + if (tmp_qmax == DUK_RE_QUANTIFIER_INFINITE) { + /* reuse last emitted atom for remaining 'infinite' quantifier */ + + if (re_ctx->curr_token.qmin == 0) { + /* Special case: original qmin was zero so there is nothing + * to repeat. Emit an atom copy but jump over it here. + */ + duk__append_reop(re_ctx, DUK_REOP_JUMP); + duk__append_jump_offset(re_ctx, atom_code_length); + duk__append_slice(re_ctx, (duk_uint32_t) atom_start_offset, (duk_uint32_t) atom_code_length); + } + if (re_ctx->curr_token.greedy) { + duk__append_reop(re_ctx, DUK_REOP_SPLIT2); /* prefer jump */ + } else { + duk__append_reop(re_ctx, DUK_REOP_SPLIT1); /* prefer direct */ + } + duk__append_jump_offset(re_ctx, -atom_code_length - 1); /* -1 for opcode */ + } else { + /* + * The remaining matches are emitted as sequence of SPLITs and atom + * copies; the SPLITs skip the remaining copies and match the sequel. + * This sequence needs to be emitted starting from the last copy + * because the SPLITs are variable length due to the variable length + * skip offset. This causes a lot of memory copying now. + * + * Example structure (greedy, match maximum # atoms): + * + * SPLIT1 LSEQ + * (atom) + * SPLIT1 LSEQ ; <- the byte length of this instruction is needed + * (atom) ; to encode the above SPLIT1 correctly + * ... + * LSEQ: + */ + duk_uint32_t offset = (duk_uint32_t) DUK__RE_BUFLEN(re_ctx); + while (tmp_qmax > 0) { + duk__insert_slice(re_ctx, offset, (duk_uint32_t) atom_start_offset, (duk_uint32_t) atom_code_length); + if (re_ctx->curr_token.greedy) { + duk__insert_u32(re_ctx, offset, DUK_REOP_SPLIT1); /* prefer direct */ + } else { + duk__insert_u32(re_ctx, offset, DUK_REOP_SPLIT2); /* prefer jump */ + } + duk__insert_jump_offset(re_ctx, + offset + 1, /* +1 for opcode */ + (duk_int32_t) (DUK__RE_BUFLEN(re_ctx) - (offset + 1))); + tmp_qmax--; + } + } + + /* remove the original 'template' atom */ + duk__remove_slice(re_ctx, (duk_uint32_t) atom_start_offset, (duk_uint32_t) atom_code_length); + } + + /* 'taint' result as complex */ + res_charlen = -1; + break; + } + case DUK_RETOK_ASSERT_START: { + duk__append_reop(re_ctx, DUK_REOP_ASSERT_START); + break; + } + case DUK_RETOK_ASSERT_END: { + duk__append_reop(re_ctx, DUK_REOP_ASSERT_END); + break; + } + case DUK_RETOK_ASSERT_WORD_BOUNDARY: { + duk__append_reop(re_ctx, DUK_REOP_ASSERT_WORD_BOUNDARY); + break; + } + case DUK_RETOK_ASSERT_NOT_WORD_BOUNDARY: { + duk__append_reop(re_ctx, DUK_REOP_ASSERT_NOT_WORD_BOUNDARY); + break; + } + case DUK_RETOK_ASSERT_START_POS_LOOKAHEAD: + case DUK_RETOK_ASSERT_START_NEG_LOOKAHEAD: { + duk_uint32_t offset; + duk_uint32_t opcode = (re_ctx->curr_token.t == DUK_RETOK_ASSERT_START_POS_LOOKAHEAD) ? + DUK_REOP_LOOKPOS : DUK_REOP_LOOKNEG; + + offset = (duk_uint32_t) DUK__RE_BUFLEN(re_ctx); + duk__parse_disjunction(re_ctx, 0, &tmp_disj); + duk__append_reop(re_ctx, DUK_REOP_MATCH); + + (void) duk__insert_u32(re_ctx, offset, opcode); + (void) duk__insert_jump_offset(re_ctx, + offset + 1, /* +1 for opcode */ + (duk_int32_t) (DUK__RE_BUFLEN(re_ctx) - (offset + 1))); + + /* 'taint' result as complex -- this is conservative, + * as lookaheads do not backtrack. + */ + res_charlen = -1; + break; + } + case DUK_RETOK_ATOM_PERIOD: { + new_atom_char_length = 1; + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + duk__append_reop(re_ctx, DUK_REOP_PERIOD); + break; + } + case DUK_RETOK_ATOM_CHAR: { + /* Note: successive characters could be joined into string matches + * but this is not trivial (consider e.g. '/xyz+/); see docs for + * more discussion. + * + * No support for \u{H+} yet. While only BMP Unicode escapes are + * supported for RegExps at present, 'ch' may still be a non-BMP + * codepoint if it is decoded straight from source text UTF-8. + * There's no non-BMP support yet so this is handled simply by + * matching the non-BMP character (which is custom behavior). + */ + duk_uint32_t ch; + + new_atom_char_length = 1; + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + duk__append_reop(re_ctx, DUK_REOP_CHAR); + ch = re_ctx->curr_token.num; + if (re_ctx->re_flags & DUK_RE_FLAG_IGNORE_CASE) { + ch = (duk_uint32_t) duk_unicode_re_canonicalize_char(re_ctx->thr, (duk_codepoint_t) ch); + } + duk__append_u32(re_ctx, ch); + break; + } + case DUK_RETOK_ATOM_DIGIT: + case DUK_RETOK_ATOM_NOT_DIGIT: + case DUK_RETOK_ATOM_WHITE: + case DUK_RETOK_ATOM_NOT_WHITE: + case DUK_RETOK_ATOM_WORD_CHAR: + case DUK_RETOK_ATOM_NOT_WORD_CHAR: { + duk_small_uint_t re_op; + duk_small_uint_t idx; + + new_atom_char_length = 1; + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + + DUK_ASSERT((DUK_RETOK_ATOM_DIGIT & 0x01) != 0); + DUK_ASSERT((DUK_RETOK_ATOM_WHITE & 0x01) != 0); + DUK_ASSERT((DUK_RETOK_ATOM_WORD_CHAR & 0x01) != 0); + DUK_ASSERT((DUK_RETOK_ATOM_NOT_DIGIT & 0x01) == 0); + DUK_ASSERT((DUK_RETOK_ATOM_NOT_WHITE & 0x01) == 0); + DUK_ASSERT((DUK_RETOK_ATOM_NOT_WORD_CHAR & 0x01) == 0); + re_op = (re_ctx->curr_token.t & 0x01) ? DUK_REOP_RANGES : DUK_REOP_INVRANGES; + + DUK_ASSERT(DUK_RETOK_ATOM_WHITE == DUK_RETOK_ATOM_DIGIT + 2); + DUK_ASSERT(DUK_RETOK_ATOM_WORD_CHAR == DUK_RETOK_ATOM_DIGIT + 4); + idx = (duk_small_uint_t) ((re_ctx->curr_token.t - DUK_RETOK_ATOM_DIGIT) >> 1U); + DUK_ASSERT(idx <= 2U); /* Assume continuous token numbers; also checks negative underflow. */ + + duk__append_range_atom_matcher(re_ctx, re_op, duk__re_range_lookup1[idx], duk__re_range_lookup2[idx]); + break; + } + case DUK_RETOK_ATOM_BACKREFERENCE: { + duk_uint32_t backref = (duk_uint32_t) re_ctx->curr_token.num; + if (backref > re_ctx->highest_backref) { + re_ctx->highest_backref = backref; + } + new_atom_char_length = -1; /* mark as complex */ + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + duk__append_reop(re_ctx, DUK_REOP_BACKREFERENCE); + duk__append_u32(re_ctx, backref); + break; + } + case DUK_RETOK_ATOM_START_CAPTURE_GROUP: { + duk_uint32_t cap; + + new_atom_char_length = -1; /* mark as complex (capture handling) */ + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + cap = ++re_ctx->captures; + duk__append_reop(re_ctx, DUK_REOP_SAVE); + duk__append_u32(re_ctx, cap * 2); + duk__parse_disjunction(re_ctx, 0, &tmp_disj); /* retval (sub-atom char length) unused, tainted as complex above */ + duk__append_reop(re_ctx, DUK_REOP_SAVE); + duk__append_u32(re_ctx, cap * 2 + 1); + break; + } + case DUK_RETOK_ATOM_START_NONCAPTURE_GROUP: { + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + duk__parse_disjunction(re_ctx, 0, &tmp_disj); + new_atom_char_length = tmp_disj.charlen; + break; + } + case DUK_RETOK_ATOM_START_CHARCLASS: + case DUK_RETOK_ATOM_START_CHARCLASS_INVERTED: { + /* + * Range parsing is done with a special lexer function which calls + * us for every range parsed. This is different from how rest of + * the parsing works, but avoids a heavy, arbitrary size intermediate + * value type to hold the ranges. + * + * Another complication is the handling of character ranges when + * case insensitive matching is used (see docs for discussion). + * The range handler callback given to the lexer takes care of this + * as well. + * + * Note that duplicate ranges are not eliminated when parsing character + * classes, so that canonicalization of + * + * [0-9a-fA-Fx-{] + * + * creates the result (note the duplicate ranges): + * + * [0-9A-FA-FX-Z{-{] + * + * where [x-{] is split as a result of canonicalization. The duplicate + * ranges are not a semantics issue: they work correctly. + */ + + duk_uint32_t offset; + + DUK_DD(DUK_DDPRINT("character class")); + + /* insert ranges instruction, range count patched in later */ + new_atom_char_length = 1; + new_atom_start_offset = (duk_int32_t) DUK__RE_BUFLEN(re_ctx); + duk__append_reop(re_ctx, + (re_ctx->curr_token.t == DUK_RETOK_ATOM_START_CHARCLASS) ? + DUK_REOP_RANGES : DUK_REOP_INVRANGES); + offset = (duk_uint32_t) DUK__RE_BUFLEN(re_ctx); /* patch in range count later */ + + /* parse ranges until character class ends */ + re_ctx->nranges = 0; /* note: ctx-wide temporary */ + duk_lexer_parse_re_ranges(&re_ctx->lex, duk__regexp_generate_ranges, (void *) re_ctx); + + /* insert range count */ + duk__insert_u32(re_ctx, offset, re_ctx->nranges); + break; + } + case DUK_RETOK_ATOM_END_GROUP: { + if (expect_eof) { + DUK_ERROR_SYNTAX(re_ctx->thr, DUK_STR_UNEXPECTED_CLOSING_PAREN); + DUK_WO_NORETURN(return;); + } + goto done; + } + case DUK_RETOK_EOF: { + if (!expect_eof) { + DUK_ERROR_SYNTAX(re_ctx->thr, DUK_STR_UNEXPECTED_END_OF_PATTERN); + DUK_WO_NORETURN(return;); + } + goto done; + } + default: { + DUK_ERROR_SYNTAX(re_ctx->thr, DUK_STR_UNEXPECTED_REGEXP_TOKEN); + DUK_WO_NORETURN(return;); + } + } + + /* a complex (new) atom taints the result */ + if (new_atom_start_offset >= 0) { + if (new_atom_char_length < 0) { + res_charlen = -1; + } else if (res_charlen >= 0) { + /* only advance if not tainted */ + res_charlen += new_atom_char_length; + } + } + + /* record previous atom info in case next token is a quantifier */ + atom_start_offset = new_atom_start_offset; + atom_char_length = new_atom_char_length; + atom_start_captures = new_atom_start_captures; + } + + done: + + /* finish up pending jump and split for last alternative */ + if (unpatched_disjunction_jump >= 0) { + duk_uint32_t offset; + + DUK_ASSERT(unpatched_disjunction_split >= 0); + offset = (duk_uint32_t) unpatched_disjunction_jump; + offset += duk__insert_jump_offset(re_ctx, + offset, + (duk_int32_t) (DUK__RE_BUFLEN(re_ctx) - offset)); + /* offset is now target of the pending split (right after jump) */ + duk__insert_jump_offset(re_ctx, + (duk_uint32_t) unpatched_disjunction_split, + (duk_int32_t) offset - unpatched_disjunction_split); + } + +#if 0 + out_atom_info->end_captures = re_ctx->captures; +#endif + out_atom_info->charlen = res_charlen; + DUK_DDD(DUK_DDDPRINT("parse disjunction finished: charlen=%ld", + (long) out_atom_info->charlen)); + + re_ctx->recursion_depth--; +} + +/* + * Flags parsing (see E5 Section 15.10.4.1). + */ + +DUK_LOCAL duk_uint32_t duk__parse_regexp_flags(duk_hthread *thr, duk_hstring *h) { + const duk_uint8_t *p; + const duk_uint8_t *p_end; + duk_uint32_t flags = 0; + + p = DUK_HSTRING_GET_DATA(h); + p_end = p + DUK_HSTRING_GET_BYTELEN(h); + + /* Note: can be safely scanned as bytes (undecoded) */ + + while (p < p_end) { + duk_uint8_t c = *p++; + switch (c) { + case (duk_uint8_t) 'g': { + if (flags & DUK_RE_FLAG_GLOBAL) { + goto flags_error; + } + flags |= DUK_RE_FLAG_GLOBAL; + break; + } + case (duk_uint8_t) 'i': { + if (flags & DUK_RE_FLAG_IGNORE_CASE) { + goto flags_error; + } + flags |= DUK_RE_FLAG_IGNORE_CASE; + break; + } + case (duk_uint8_t) 'm': { + if (flags & DUK_RE_FLAG_MULTILINE) { + goto flags_error; + } + flags |= DUK_RE_FLAG_MULTILINE; + break; + } + default: { + goto flags_error; + } + } + } + + return flags; + + flags_error: + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_REGEXP_FLAGS); + DUK_WO_NORETURN(return 0U;); +} + +/* + * Create escaped RegExp source (E5 Section 15.10.3). + * + * The current approach is to special case the empty RegExp + * ('' -> '(?:)') and otherwise replace unescaped '/' characters + * with '\/' regardless of where they occur in the regexp. + * + * Note that normalization does not seem to be necessary for + * RegExp literals (e.g. '/foo/') because to be acceptable as + * a RegExp literal, the text between forward slashes must + * already match the escaping requirements (e.g. must not contain + * unescaped forward slashes or be empty). Escaping IS needed + * for expressions like 'new Regexp("...", "")' however. + * Currently, we re-escape in either case. + * + * Also note that we process the source here in UTF-8 encoded + * form. This is correct, because any non-ASCII characters are + * passed through without change. + */ + +DUK_LOCAL void duk__create_escaped_source(duk_hthread *thr, int idx_pattern) { + duk_hstring *h; + const duk_uint8_t *p; + duk_bufwriter_ctx bw_alloc; + duk_bufwriter_ctx *bw; + duk_uint8_t *q; + duk_size_t i, n; + duk_uint_fast8_t c_prev, c; + + h = duk_known_hstring(thr, idx_pattern); + p = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h); + n = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h); + + if (n == 0) { + duk_push_literal(thr, "(?:)"); + return; + } + + bw = &bw_alloc; + DUK_BW_INIT_PUSHBUF(thr, bw, n); + q = DUK_BW_GET_PTR(thr, bw); + + c_prev = (duk_uint_fast8_t) 0; + + for (i = 0; i < n; i++) { + c = p[i]; + + q = DUK_BW_ENSURE_RAW(thr, bw, 2, q); + + if (c == (duk_uint_fast8_t) '/' && c_prev != (duk_uint_fast8_t) '\\') { + /* Unescaped '/' ANYWHERE in the regexp (in disjunction, + * inside a character class, ...) => same escape works. + */ + *q++ = DUK_ASC_BACKSLASH; + } + *q++ = (duk_uint8_t) c; + + c_prev = c; + } + + DUK_BW_SETPTR_AND_COMPACT(thr, bw, q); + (void) duk_buffer_to_string(thr, -1); /* Safe if input is safe. */ + + /* [ ... escaped_source ] */ +} + +/* + * Exposed regexp compilation primitive. + * + * Sets up a regexp compilation context, and calls duk__parse_disjunction() to do the + * actual parsing. Handles generation of the compiled regexp header and the + * "boilerplate" capture of the matching substring (save 0 and 1). Also does some + * global level regexp checks after recursive compilation has finished. + * + * An escaped version of the regexp source, suitable for use as a RegExp instance + * 'source' property (see E5 Section 15.10.3), is also left on the stack. + * + * Input stack: [ pattern flags ] + * Output stack: [ bytecode escaped_source ] (both as strings) + */ + +DUK_INTERNAL void duk_regexp_compile(duk_hthread *thr) { + duk_re_compiler_ctx re_ctx; + duk_lexer_point lex_point; + duk_hstring *h_pattern; + duk_hstring *h_flags; + duk__re_disjunction_info ign_disj; + + DUK_ASSERT(thr != NULL); + + /* + * Args validation + */ + + /* TypeError if fails */ + h_pattern = duk_require_hstring_notsymbol(thr, -2); + h_flags = duk_require_hstring_notsymbol(thr, -1); + + /* + * Create normalized 'source' property (E5 Section 15.10.3). + */ + + /* [ ... pattern flags ] */ + + duk__create_escaped_source(thr, -2); + + /* [ ... pattern flags escaped_source ] */ + + /* + * Init compilation context + */ + + /* [ ... pattern flags escaped_source buffer ] */ + + duk_memzero(&re_ctx, sizeof(re_ctx)); + DUK_LEXER_INITCTX(&re_ctx.lex); /* duplicate zeroing, expect for (possible) NULL inits */ + re_ctx.thr = thr; + re_ctx.lex.thr = thr; + re_ctx.lex.input = DUK_HSTRING_GET_DATA(h_pattern); + re_ctx.lex.input_length = DUK_HSTRING_GET_BYTELEN(h_pattern); + re_ctx.lex.token_limit = DUK_RE_COMPILE_TOKEN_LIMIT; + re_ctx.recursion_limit = DUK_USE_REGEXP_COMPILER_RECLIMIT; + re_ctx.re_flags = duk__parse_regexp_flags(thr, h_flags); + + DUK_BW_INIT_PUSHBUF(thr, &re_ctx.bw, DUK__RE_INITIAL_BUFSIZE); + + DUK_DD(DUK_DDPRINT("regexp compiler ctx initialized, flags=0x%08lx, recursion_limit=%ld", + (unsigned long) re_ctx.re_flags, (long) re_ctx.recursion_limit)); + + /* + * Init lexer + */ + + lex_point.offset = 0; /* expensive init, just want to fill window */ + lex_point.line = 1; + DUK_LEXER_SETPOINT(&re_ctx.lex, &lex_point); + + /* + * Compilation + */ + + DUK_DD(DUK_DDPRINT("starting regexp compilation")); + + duk__append_reop(&re_ctx, DUK_REOP_SAVE); + duk__append_7bit(&re_ctx, 0); + duk__parse_disjunction(&re_ctx, 1 /*expect_eof*/, &ign_disj); + duk__append_reop(&re_ctx, DUK_REOP_SAVE); + duk__append_7bit(&re_ctx, 1); + duk__append_reop(&re_ctx, DUK_REOP_MATCH); + + /* + * Check for invalid backreferences; note that it is NOT an error + * to back-reference a capture group which has not yet been introduced + * in the pattern (as in /\1(foo)/); in fact, the backreference will + * always match! It IS an error to back-reference a capture group + * which will never be introduced in the pattern. Thus, we can check + * for such references only after parsing is complete. + */ + + if (re_ctx.highest_backref > re_ctx.captures) { + DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_BACKREFS); + DUK_WO_NORETURN(return;); + } + + /* + * Emit compiled regexp header: flags, ncaptures + * (insertion order inverted on purpose) + */ + + duk__insert_u32(&re_ctx, 0, (re_ctx.captures + 1) * 2); + duk__insert_u32(&re_ctx, 0, re_ctx.re_flags); + + /* [ ... pattern flags escaped_source buffer ] */ + + DUK_BW_COMPACT(thr, &re_ctx.bw); + (void) duk_buffer_to_string(thr, -1); /* Safe because flags is at most 7 bit. */ + + /* [ ... pattern flags escaped_source bytecode ] */ + + /* + * Finalize stack + */ + + duk_remove(thr, -4); /* -> [ ... flags escaped_source bytecode ] */ + duk_remove(thr, -3); /* -> [ ... escaped_source bytecode ] */ + + DUK_DD(DUK_DDPRINT("regexp compilation successful, bytecode: %!T, escaped source: %!T", + (duk_tval *) duk_get_tval(thr, -1), (duk_tval *) duk_get_tval(thr, -2))); +} + +/* + * Create a RegExp instance (E5 Section 15.10.7). + * + * Note: the output stack left by duk_regexp_compile() is directly compatible + * with the input here. + * + * Input stack: [ escaped_source bytecode ] (both as strings) + * Output stack: [ RegExp ] + */ + +DUK_INTERNAL void duk_regexp_create_instance(duk_hthread *thr) { + duk_hobject *h; + + /* [ ... escaped_source bytecode ] */ + + duk_push_object(thr); + h = duk_known_hobject(thr, -1); + duk_insert(thr, -3); + + /* [ ... regexp_object escaped_source bytecode ] */ + + DUK_HOBJECT_SET_CLASS_NUMBER(h, DUK_HOBJECT_CLASS_REGEXP); + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, h, thr->builtins[DUK_BIDX_REGEXP_PROTOTYPE]); + + duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_INT_BYTECODE, DUK_PROPDESC_FLAGS_NONE); + + /* [ ... regexp_object escaped_source ] */ + + /* In ES2015 .source, and the .global, .multiline, etc flags are + * inherited getters. Store the escaped source as an internal + * property for the getter. + */ + + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_SOURCE, DUK_PROPDESC_FLAGS_NONE); + + /* [ ... regexp_object ] */ + + duk_push_int(thr, 0); + duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LAST_INDEX, DUK_PROPDESC_FLAGS_W); + + /* [ ... regexp_object ] */ +} + +#else /* DUK_USE_REGEXP_SUPPORT */ + +/* regexp support disabled */ + +#endif /* DUK_USE_REGEXP_SUPPORT */ + +/* automatic undefs */ +#undef DUK__RE_BUFLEN +#undef DUK__RE_INITIAL_BUFSIZE +#line 1 "duk_regexp_executor.c" +/* + * Regexp executor. + * + * Safety: the ECMAScript executor should prevent user from reading and + * replacing regexp bytecode. Even so, the executor must validate all + * memory accesses etc. When an invalid access is detected (e.g. a 'save' + * opcode to invalid, unallocated index) it should fail with an internal + * error but not cause a segmentation fault. + * + * Notes: + * + * - Backtrack counts are limited to unsigned 32 bits but should + * technically be duk_size_t for strings longer than 4G chars. + * This also requires a regexp bytecode change. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_REGEXP_SUPPORT) + +/* + * Helpers for UTF-8 handling + * + * For bytecode readers the duk_uint32_t and duk_int32_t types are correct + * because they're used for more than just codepoints. + */ + +DUK_LOCAL duk_uint32_t duk__bc_get_u32(duk_re_matcher_ctx *re_ctx, const duk_uint8_t **pc) { + return (duk_uint32_t) duk_unicode_decode_xutf8_checked(re_ctx->thr, pc, re_ctx->bytecode, re_ctx->bytecode_end); +} + +DUK_LOCAL duk_int32_t duk__bc_get_i32(duk_re_matcher_ctx *re_ctx, const duk_uint8_t **pc) { + duk_uint32_t t; + + /* signed integer encoding needed to work with UTF-8 */ + t = (duk_uint32_t) duk_unicode_decode_xutf8_checked(re_ctx->thr, pc, re_ctx->bytecode, re_ctx->bytecode_end); + if (t & 1) { + return -((duk_int32_t) (t >> 1)); + } else { + return (duk_int32_t) (t >> 1); + } +} + +DUK_LOCAL const duk_uint8_t *duk__utf8_backtrack(duk_hthread *thr, const duk_uint8_t **ptr, const duk_uint8_t *ptr_start, const duk_uint8_t *ptr_end, duk_uint_fast32_t count) { + const duk_uint8_t *p; + + /* Note: allow backtracking from p == ptr_end */ + p = *ptr; + if (p < ptr_start || p > ptr_end) { + goto fail; + } + + while (count > 0) { + for (;;) { + p--; + if (p < ptr_start) { + goto fail; + } + if ((*p & 0xc0) != 0x80) { + /* utf-8 continuation bytes have the form 10xx xxxx */ + break; + } + } + count--; + } + *ptr = p; + return p; + + fail: + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return NULL;); +} + +DUK_LOCAL const duk_uint8_t *duk__utf8_advance(duk_hthread *thr, const duk_uint8_t **ptr, const duk_uint8_t *ptr_start, const duk_uint8_t *ptr_end, duk_uint_fast32_t count) { + const duk_uint8_t *p; + + p = *ptr; + if (p < ptr_start || p >= ptr_end) { + goto fail; + } + + while (count > 0) { + for (;;) { + p++; + + /* Note: if encoding ends by hitting end of input, we don't check that + * the encoding is valid, we just assume it is. + */ + if (p >= ptr_end || ((*p & 0xc0) != 0x80)) { + /* utf-8 continuation bytes have the form 10xx xxxx */ + break; + } + } + count--; + } + + *ptr = p; + return p; + + fail: + DUK_ERROR_INTERNAL(thr); + DUK_WO_NORETURN(return NULL;); +} + +/* + * Helpers for dealing with the input string + */ + +/* Get a (possibly canonicalized) input character from current sp. The input + * itself is never modified, and captures always record non-canonicalized + * characters even in case-insensitive matching. Return <0 if out of input. + */ +DUK_LOCAL duk_codepoint_t duk__inp_get_cp(duk_re_matcher_ctx *re_ctx, const duk_uint8_t **sp) { + duk_codepoint_t res; + + if (*sp >= re_ctx->input_end) { + return -1; + } + res = (duk_codepoint_t) duk_unicode_decode_xutf8_checked(re_ctx->thr, sp, re_ctx->input, re_ctx->input_end); + if (re_ctx->re_flags & DUK_RE_FLAG_IGNORE_CASE) { + res = duk_unicode_re_canonicalize_char(re_ctx->thr, res); + } + return res; +} + +DUK_LOCAL const duk_uint8_t *duk__inp_backtrack(duk_re_matcher_ctx *re_ctx, const duk_uint8_t **sp, duk_uint_fast32_t count) { + return duk__utf8_backtrack(re_ctx->thr, sp, re_ctx->input, re_ctx->input_end, count); +} + +/* Backtrack utf-8 input and return a (possibly canonicalized) input character. */ +DUK_LOCAL duk_codepoint_t duk__inp_get_prev_cp(duk_re_matcher_ctx *re_ctx, const duk_uint8_t *sp) { + /* note: caller 'sp' is intentionally not updated here */ + (void) duk__inp_backtrack(re_ctx, &sp, (duk_uint_fast32_t) 1); + return duk__inp_get_cp(re_ctx, &sp); +} + +/* + * Regexp recursive matching function. + * + * Returns 'sp' on successful match (points to character after last matched one), + * NULL otherwise. + * + * The C recursion depth limit check is only performed in this function, this + * suffices because the function is present in all true recursion required by + * regexp execution. + */ + +DUK_LOCAL const duk_uint8_t *duk__match_regexp(duk_re_matcher_ctx *re_ctx, const duk_uint8_t *pc, const duk_uint8_t *sp) { + if (re_ctx->recursion_depth >= re_ctx->recursion_limit) { + DUK_ERROR_RANGE(re_ctx->thr, DUK_STR_REGEXP_EXECUTOR_RECURSION_LIMIT); + DUK_WO_NORETURN(return NULL;); + } + re_ctx->recursion_depth++; + + for (;;) { + duk_small_int_t op; + + if (re_ctx->steps_count >= re_ctx->steps_limit) { + DUK_ERROR_RANGE(re_ctx->thr, DUK_STR_REGEXP_EXECUTOR_STEP_LIMIT); + DUK_WO_NORETURN(return NULL;); + } + re_ctx->steps_count++; + + /* Opcodes are at most 7 bits now so they encode to one byte. If this + * were not the case or 'pc' is invalid here (due to a bug etc) we'll + * still fail safely through the switch default case. + */ + DUK_ASSERT(pc[0] <= 0x7fU); +#if 0 + op = (duk_small_int_t) duk__bc_get_u32(re_ctx, &pc); +#endif + op = *pc++; + + DUK_DDD(DUK_DDDPRINT("match: rec=%ld, steps=%ld, pc (after op)=%ld, sp=%ld, op=%ld", + (long) re_ctx->recursion_depth, + (long) re_ctx->steps_count, + (long) (pc - re_ctx->bytecode), + (long) (sp - re_ctx->input), + (long) op)); + + switch (op) { + case DUK_REOP_MATCH: { + goto match; + } + case DUK_REOP_CHAR: { + /* + * Byte-based matching would be possible for case-sensitive + * matching but not for case-insensitive matching. So, we + * match by decoding the input and bytecode character normally. + * + * Bytecode characters are assumed to be already canonicalized. + * Input characters are canonicalized automatically by + * duk__inp_get_cp() if necessary. + * + * There is no opcode for matching multiple characters. The + * regexp compiler has trouble joining strings efficiently + * during compilation. See doc/regexp.rst for more discussion. + */ + duk_codepoint_t c1, c2; + + c1 = (duk_codepoint_t) duk__bc_get_u32(re_ctx, &pc); + DUK_ASSERT(!(re_ctx->re_flags & DUK_RE_FLAG_IGNORE_CASE) || + c1 == duk_unicode_re_canonicalize_char(re_ctx->thr, c1)); /* canonicalized by compiler */ + c2 = duk__inp_get_cp(re_ctx, &sp); + /* No need to check for c2 < 0 (end of input): because c1 >= 0, it + * will fail the match below automatically and cause goto fail. + */ +#if 0 + if (c2 < 0) { + goto fail; + } +#endif + DUK_ASSERT(c1 >= 0); + + DUK_DDD(DUK_DDDPRINT("char match, c1=%ld, c2=%ld", (long) c1, (long) c2)); + if (c1 != c2) { + goto fail; + } + break; + } + case DUK_REOP_PERIOD: { + duk_codepoint_t c; + + c = duk__inp_get_cp(re_ctx, &sp); + if (c < 0 || duk_unicode_is_line_terminator(c)) { + /* E5 Sections 15.10.2.8, 7.3 */ + goto fail; + } + break; + } + case DUK_REOP_RANGES: + case DUK_REOP_INVRANGES: { + duk_uint32_t n; + duk_codepoint_t c; + duk_small_int_t match; + + n = duk__bc_get_u32(re_ctx, &pc); + c = duk__inp_get_cp(re_ctx, &sp); + if (c < 0) { + goto fail; + } + + match = 0; + while (n) { + duk_codepoint_t r1, r2; + r1 = (duk_codepoint_t) duk__bc_get_u32(re_ctx, &pc); + r2 = (duk_codepoint_t) duk__bc_get_u32(re_ctx, &pc); + DUK_DDD(DUK_DDDPRINT("matching ranges/invranges, n=%ld, r1=%ld, r2=%ld, c=%ld", + (long) n, (long) r1, (long) r2, (long) c)); + if (c >= r1 && c <= r2) { + /* Note: don't bail out early, we must read all the ranges from + * bytecode. Another option is to skip them efficiently after + * breaking out of here. Prefer smallest code. + */ + match = 1; + } + n--; + } + + if (op == DUK_REOP_RANGES) { + if (!match) { + goto fail; + } + } else { + DUK_ASSERT(op == DUK_REOP_INVRANGES); + if (match) { + goto fail; + } + } + break; + } + case DUK_REOP_ASSERT_START: { + duk_codepoint_t c; + + if (sp <= re_ctx->input) { + break; + } + if (!(re_ctx->re_flags & DUK_RE_FLAG_MULTILINE)) { + goto fail; + } + c = duk__inp_get_prev_cp(re_ctx, sp); + if (duk_unicode_is_line_terminator(c)) { + /* E5 Sections 15.10.2.8, 7.3 */ + break; + } + goto fail; + } + case DUK_REOP_ASSERT_END: { + duk_codepoint_t c; + const duk_uint8_t *tmp_sp; + + tmp_sp = sp; + c = duk__inp_get_cp(re_ctx, &tmp_sp); + if (c < 0) { + break; + } + if (!(re_ctx->re_flags & DUK_RE_FLAG_MULTILINE)) { + goto fail; + } + if (duk_unicode_is_line_terminator(c)) { + /* E5 Sections 15.10.2.8, 7.3 */ + break; + } + goto fail; + } + case DUK_REOP_ASSERT_WORD_BOUNDARY: + case DUK_REOP_ASSERT_NOT_WORD_BOUNDARY: { + /* + * E5 Section 15.10.2.6. The previous and current character + * should -not- be canonicalized as they are now. However, + * canonicalization does not affect the result of IsWordChar() + * (which depends on Unicode characters never canonicalizing + * into ASCII characters) so this does not matter. + */ + duk_small_int_t w1, w2; + + if (sp <= re_ctx->input) { + w1 = 0; /* not a wordchar */ + } else { + duk_codepoint_t c; + c = duk__inp_get_prev_cp(re_ctx, sp); + w1 = duk_unicode_re_is_wordchar(c); + } + if (sp >= re_ctx->input_end) { + w2 = 0; /* not a wordchar */ + } else { + const duk_uint8_t *tmp_sp = sp; /* dummy so sp won't get updated */ + duk_codepoint_t c; + c = duk__inp_get_cp(re_ctx, &tmp_sp); + w2 = duk_unicode_re_is_wordchar(c); + } + + if (op == DUK_REOP_ASSERT_WORD_BOUNDARY) { + if (w1 == w2) { + goto fail; + } + } else { + DUK_ASSERT(op == DUK_REOP_ASSERT_NOT_WORD_BOUNDARY); + if (w1 != w2) { + goto fail; + } + } + break; + } + case DUK_REOP_JUMP: { + duk_int32_t skip; + + skip = duk__bc_get_i32(re_ctx, &pc); + pc += skip; + break; + } + case DUK_REOP_SPLIT1: { + /* split1: prefer direct execution (no jump) */ + const duk_uint8_t *sub_sp; + duk_int32_t skip; + + skip = duk__bc_get_i32(re_ctx, &pc); + sub_sp = duk__match_regexp(re_ctx, pc, sp); + if (sub_sp) { + sp = sub_sp; + goto match; + } + pc += skip; + break; + } + case DUK_REOP_SPLIT2: { + /* split2: prefer jump execution (not direct) */ + const duk_uint8_t *sub_sp; + duk_int32_t skip; + + skip = duk__bc_get_i32(re_ctx, &pc); + sub_sp = duk__match_regexp(re_ctx, pc + skip, sp); + if (sub_sp) { + sp = sub_sp; + goto match; + } + break; + } + case DUK_REOP_SQMINIMAL: { + duk_uint32_t q, qmin, qmax; + duk_int32_t skip; + const duk_uint8_t *sub_sp; + + qmin = duk__bc_get_u32(re_ctx, &pc); + qmax = duk__bc_get_u32(re_ctx, &pc); + skip = duk__bc_get_i32(re_ctx, &pc); + DUK_DDD(DUK_DDDPRINT("minimal quantifier, qmin=%lu, qmax=%lu, skip=%ld", + (unsigned long) qmin, (unsigned long) qmax, (long) skip)); + + q = 0; + while (q <= qmax) { + if (q >= qmin) { + sub_sp = duk__match_regexp(re_ctx, pc + skip, sp); + if (sub_sp) { + sp = sub_sp; + goto match; + } + } + sub_sp = duk__match_regexp(re_ctx, pc, sp); + if (!sub_sp) { + break; + } + sp = sub_sp; + q++; + } + goto fail; + } + case DUK_REOP_SQGREEDY: { + duk_uint32_t q, qmin, qmax, atomlen; + duk_int32_t skip; + const duk_uint8_t *sub_sp; + + qmin = duk__bc_get_u32(re_ctx, &pc); + qmax = duk__bc_get_u32(re_ctx, &pc); + atomlen = duk__bc_get_u32(re_ctx, &pc); + skip = duk__bc_get_i32(re_ctx, &pc); + DUK_DDD(DUK_DDDPRINT("greedy quantifier, qmin=%lu, qmax=%lu, atomlen=%lu, skip=%ld", + (unsigned long) qmin, (unsigned long) qmax, (unsigned long) atomlen, (long) skip)); + + q = 0; + while (q < qmax) { + sub_sp = duk__match_regexp(re_ctx, pc, sp); + if (!sub_sp) { + break; + } + sp = sub_sp; + q++; + } + while (q >= qmin) { + sub_sp = duk__match_regexp(re_ctx, pc + skip, sp); + if (sub_sp) { + sp = sub_sp; + goto match; + } + if (q == qmin) { + break; + } + + /* Note: if atom were to contain e.g. captures, we would need to + * re-match the atom to get correct captures. Simply quantifiers + * do not allow captures in their atom now, so this is not an issue. + */ + + DUK_DDD(DUK_DDDPRINT("greedy quantifier, backtrack %ld characters (atomlen)", + (long) atomlen)); + sp = duk__inp_backtrack(re_ctx, &sp, (duk_uint_fast32_t) atomlen); + q--; + } + goto fail; + } + case DUK_REOP_SAVE: { + duk_uint32_t idx; + const duk_uint8_t *old; + const duk_uint8_t *sub_sp; + + idx = duk__bc_get_u32(re_ctx, &pc); + if (idx >= re_ctx->nsaved) { + /* idx is unsigned, < 0 check is not necessary */ + DUK_D(DUK_DPRINT("internal error, regexp save index insane: idx=%ld", (long) idx)); + goto internal_error; + } + old = re_ctx->saved[idx]; + re_ctx->saved[idx] = sp; + sub_sp = duk__match_regexp(re_ctx, pc, sp); + if (sub_sp) { + sp = sub_sp; + goto match; + } + re_ctx->saved[idx] = old; + goto fail; + } + case DUK_REOP_WIPERANGE: { + /* Wipe capture range and save old values for backtracking. + * + * XXX: this typically happens with a relatively small idx_count. + * It might be useful to handle cases where the count is small + * (say <= 8) by saving the values in stack instead. This would + * reduce memory churn and improve performance, at the cost of a + * slightly higher code footprint. + */ + duk_uint32_t idx_start, idx_count; +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + duk_uint32_t idx_end, idx; +#endif + duk_uint8_t **range_save; + const duk_uint8_t *sub_sp; + + idx_start = duk__bc_get_u32(re_ctx, &pc); + idx_count = duk__bc_get_u32(re_ctx, &pc); + DUK_DDD(DUK_DDDPRINT("wipe saved range: start=%ld, count=%ld -> [%ld,%ld] (captures [%ld,%ld])", + (long) idx_start, (long) idx_count, + (long) idx_start, (long) (idx_start + idx_count - 1), + (long) (idx_start / 2), (long) ((idx_start + idx_count - 1) / 2))); + if (idx_start + idx_count > re_ctx->nsaved || idx_count == 0) { + /* idx is unsigned, < 0 check is not necessary */ + DUK_D(DUK_DPRINT("internal error, regexp wipe indices insane: idx_start=%ld, idx_count=%ld", + (long) idx_start, (long) idx_count)); + goto internal_error; + } + DUK_ASSERT(idx_count > 0); + + duk_require_stack(re_ctx->thr, 1); + range_save = (duk_uint8_t **) duk_push_fixed_buffer_nozero(re_ctx->thr, + sizeof(duk_uint8_t *) * idx_count); + DUK_ASSERT(range_save != NULL); + duk_memcpy(range_save, re_ctx->saved + idx_start, sizeof(duk_uint8_t *) * idx_count); +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + idx_end = idx_start + idx_count; + for (idx = idx_start; idx < idx_end; idx++) { + re_ctx->saved[idx] = NULL; + } +#else + duk_memzero((void *) (re_ctx->saved + idx_start), sizeof(duk_uint8_t *) * idx_count); +#endif + + sub_sp = duk__match_regexp(re_ctx, pc, sp); + if (sub_sp) { + /* match: keep wiped/resaved values */ + DUK_DDD(DUK_DDDPRINT("match: keep wiped/resaved values [%ld,%ld] (captures [%ld,%ld])", + (long) idx_start, (long) (idx_start + idx_count - 1), + (long) (idx_start / 2), (long) ((idx_start + idx_count - 1) / 2))); + duk_pop_unsafe(re_ctx->thr); + sp = sub_sp; + goto match; + } + + /* fail: restore saves */ + DUK_DDD(DUK_DDDPRINT("fail: restore wiped/resaved values [%ld,%ld] (captures [%ld,%ld])", + (long) idx_start, (long) (idx_start + idx_count - 1), + (long) (idx_start / 2), (long) ((idx_start + idx_count - 1) / 2))); + duk_memcpy((void *) (re_ctx->saved + idx_start), + (const void *) range_save, + sizeof(duk_uint8_t *) * idx_count); + duk_pop_unsafe(re_ctx->thr); + goto fail; + } + case DUK_REOP_LOOKPOS: + case DUK_REOP_LOOKNEG: { + /* + * Needs a save of multiple saved[] entries depending on what range + * may be overwritten. Because the regexp parser does no such analysis, + * we currently save the entire saved array here. Lookaheads are thus + * a bit expensive. Note that the saved array is not needed for just + * the lookahead sub-match, but for the matching of the entire sequel. + * + * The temporary save buffer is pushed on to the valstack to handle + * errors correctly. Each lookahead causes a C recursion and pushes + * more stuff on the value stack. If the C recursion limit is less + * than the value stack slack, there is no need to check the stack. + * We do so regardless, just in case. + */ + + duk_int32_t skip; + duk_uint8_t **full_save; + const duk_uint8_t *sub_sp; + + DUK_ASSERT(re_ctx->nsaved > 0); + + duk_require_stack(re_ctx->thr, 1); + full_save = (duk_uint8_t **) duk_push_fixed_buffer_nozero(re_ctx->thr, + sizeof(duk_uint8_t *) * re_ctx->nsaved); + DUK_ASSERT(full_save != NULL); + duk_memcpy(full_save, re_ctx->saved, sizeof(duk_uint8_t *) * re_ctx->nsaved); + + skip = duk__bc_get_i32(re_ctx, &pc); + sub_sp = duk__match_regexp(re_ctx, pc, sp); + if (op == DUK_REOP_LOOKPOS) { + if (!sub_sp) { + goto lookahead_fail; + } + } else { + if (sub_sp) { + goto lookahead_fail; + } + } + sub_sp = duk__match_regexp(re_ctx, pc + skip, sp); + if (sub_sp) { + /* match: keep saves */ + duk_pop_unsafe(re_ctx->thr); + sp = sub_sp; + goto match; + } + + /* fall through */ + + lookahead_fail: + /* fail: restore saves */ + duk_memcpy((void *) re_ctx->saved, + (const void *) full_save, + sizeof(duk_uint8_t *) * re_ctx->nsaved); + duk_pop_unsafe(re_ctx->thr); + goto fail; + } + case DUK_REOP_BACKREFERENCE: { + /* + * Byte matching for back-references would be OK in case- + * sensitive matching. In case-insensitive matching we need + * to canonicalize characters, so back-reference matching needs + * to be done with codepoints instead. So, we just decode + * everything normally here, too. + * + * Note: back-reference index which is 0 or higher than + * NCapturingParens (= number of capturing parens in the + * -entire- regexp) is a compile time error. However, a + * backreference referring to a valid capture which has + * not matched anything always succeeds! See E5 Section + * 15.10.2.9, step 5, sub-step 3. + */ + duk_uint32_t idx; + const duk_uint8_t *p; + + idx = duk__bc_get_u32(re_ctx, &pc); + idx = idx << 1; /* backref n -> saved indices [n*2, n*2+1] */ + if (idx < 2 || idx + 1 >= re_ctx->nsaved) { + /* regexp compiler should catch these */ + DUK_D(DUK_DPRINT("internal error, backreference index insane")); + goto internal_error; + } + if (!re_ctx->saved[idx] || !re_ctx->saved[idx+1]) { + /* capture is 'undefined', always matches! */ + DUK_DDD(DUK_DDDPRINT("backreference: saved[%ld,%ld] not complete, always match", + (long) idx, (long) (idx + 1))); + break; + } + DUK_DDD(DUK_DDDPRINT("backreference: match saved[%ld,%ld]", (long) idx, (long) (idx + 1))); + + p = re_ctx->saved[idx]; + while (p < re_ctx->saved[idx+1]) { + duk_codepoint_t c1, c2; + + /* Note: not necessary to check p against re_ctx->input_end: + * the memory access is checked by duk__inp_get_cp(), while + * valid compiled regexps cannot write a saved[] entry + * which points to outside the string. + */ + c1 = duk__inp_get_cp(re_ctx, &p); + DUK_ASSERT(c1 >= 0); + c2 = duk__inp_get_cp(re_ctx, &sp); + /* No need for an explicit c2 < 0 check: because c1 >= 0, + * the comparison will always fail if c2 < 0. + */ +#if 0 + if (c2 < 0) { + goto fail; + } +#endif + if (c1 != c2) { + goto fail; + } + } + break; + } + default: { + DUK_D(DUK_DPRINT("internal error, regexp opcode error: %ld", (long) op)); + goto internal_error; + } + } + } + + match: + re_ctx->recursion_depth--; + return sp; + + fail: + re_ctx->recursion_depth--; + return NULL; + + internal_error: + DUK_ERROR_INTERNAL(re_ctx->thr); + DUK_WO_NORETURN(return NULL;); +} + +/* + * Exposed matcher function which provides the semantics of RegExp.prototype.exec(). + * + * RegExp.prototype.test() has the same semantics as exec() but does not return the + * result object (which contains the matching string and capture groups). Currently + * there is no separate test() helper, so a temporary result object is created and + * discarded if test() is needed. This is intentional, to save code space. + * + * Input stack: [ ... re_obj input ] + * Output stack: [ ... result ] + */ + +DUK_LOCAL void duk__regexp_match_helper(duk_hthread *thr, duk_small_int_t force_global) { + duk_re_matcher_ctx re_ctx; + duk_hobject *h_regexp; + duk_hstring *h_bytecode; + duk_hstring *h_input; + duk_uint8_t *p_buf; + const duk_uint8_t *pc; + const duk_uint8_t *sp; + duk_small_int_t match = 0; + duk_small_int_t global; + duk_uint_fast32_t i; + double d; + duk_uint32_t char_offset; + + DUK_ASSERT(thr != NULL); + + DUK_DD(DUK_DDPRINT("regexp match: regexp=%!T, input=%!T", + (duk_tval *) duk_get_tval(thr, -2), + (duk_tval *) duk_get_tval(thr, -1))); + + /* + * Regexp instance check, bytecode check, input coercion. + * + * See E5 Section 15.10.6. + */ + + /* TypeError if wrong; class check, see E5 Section 15.10.6 */ + h_regexp = duk_require_hobject_with_class(thr, -2, DUK_HOBJECT_CLASS_REGEXP); + DUK_ASSERT(h_regexp != NULL); + DUK_ASSERT(DUK_HOBJECT_GET_CLASS_NUMBER(h_regexp) == DUK_HOBJECT_CLASS_REGEXP); + DUK_UNREF(h_regexp); + + h_input = duk_to_hstring(thr, -1); + DUK_ASSERT(h_input != NULL); + + duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_INT_BYTECODE); /* [ ... re_obj input ] -> [ ... re_obj input bc ] */ + h_bytecode = duk_require_hstring(thr, -1); /* no regexp instance should exist without a non-configurable bytecode property */ + DUK_ASSERT(h_bytecode != NULL); + + /* + * Basic context initialization. + * + * Some init values are read from the bytecode header + * whose format is (UTF-8 codepoints): + * + * uint flags + * uint nsaved (even, 2n+2 where n = num captures) + */ + + /* [ ... re_obj input bc ] */ + + duk_memzero(&re_ctx, sizeof(re_ctx)); + + re_ctx.thr = thr; + re_ctx.input = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_input); + re_ctx.input_end = re_ctx.input + DUK_HSTRING_GET_BYTELEN(h_input); + re_ctx.bytecode = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h_bytecode); + re_ctx.bytecode_end = re_ctx.bytecode + DUK_HSTRING_GET_BYTELEN(h_bytecode); + re_ctx.saved = NULL; + re_ctx.recursion_limit = DUK_USE_REGEXP_EXECUTOR_RECLIMIT; + re_ctx.steps_limit = DUK_RE_EXECUTE_STEPS_LIMIT; + + /* read header */ + pc = re_ctx.bytecode; + re_ctx.re_flags = duk__bc_get_u32(&re_ctx, &pc); + re_ctx.nsaved = duk__bc_get_u32(&re_ctx, &pc); + re_ctx.bytecode = pc; + + DUK_ASSERT(DUK_RE_FLAG_GLOBAL < 0x10000UL); /* must fit into duk_small_int_t */ + global = (duk_small_int_t) (force_global | (duk_small_int_t) (re_ctx.re_flags & DUK_RE_FLAG_GLOBAL)); + + DUK_ASSERT(re_ctx.nsaved >= 2); + DUK_ASSERT((re_ctx.nsaved % 2) == 0); + + p_buf = (duk_uint8_t *) duk_push_fixed_buffer(thr, sizeof(duk_uint8_t *) * re_ctx.nsaved); /* rely on zeroing */ + DUK_UNREF(p_buf); + re_ctx.saved = (const duk_uint8_t **) duk_get_buffer(thr, -1, NULL); + DUK_ASSERT(re_ctx.saved != NULL); + + /* [ ... re_obj input bc saved_buf ] */ + +#if defined(DUK_USE_EXPLICIT_NULL_INIT) + for (i = 0; i < re_ctx.nsaved; i++) { + re_ctx.saved[i] = (duk_uint8_t *) NULL; + } +#elif defined(DUK_USE_ZERO_BUFFER_DATA) + /* buffer is automatically zeroed */ +#else + duk_memzero((void *) p_buf, sizeof(duk_uint8_t *) * re_ctx.nsaved); +#endif + + DUK_DDD(DUK_DDDPRINT("regexp ctx initialized, flags=0x%08lx, nsaved=%ld, recursion_limit=%ld, steps_limit=%ld", + (unsigned long) re_ctx.re_flags, (long) re_ctx.nsaved, (long) re_ctx.recursion_limit, + (long) re_ctx.steps_limit)); + + /* + * Get starting character offset for match, and initialize 'sp' based on it. + * + * Note: lastIndex is non-configurable so it must be present (we check the + * internal class of the object above, so we know it is). User code can set + * its value to an arbitrary (garbage) value though; E5 requires that lastIndex + * be coerced to a number before using. The code below works even if the + * property is missing: the value will then be coerced to zero. + * + * Note: lastIndex may be outside Uint32 range even after ToInteger() coercion. + * For instance, ToInteger(+Infinity) = +Infinity. We track the match offset + * as an integer, but pre-check it to be inside the 32-bit range before the loop. + * If not, the check in E5 Section 15.10.6.2, step 9.a applies. + */ + + /* XXX: lastIndex handling produces a lot of asm */ + + /* [ ... re_obj input bc saved_buf ] */ + + duk_get_prop_stridx_short(thr, -4, DUK_STRIDX_LAST_INDEX); /* -> [ ... re_obj input bc saved_buf lastIndex ] */ + (void) duk_to_int(thr, -1); /* ToInteger(lastIndex) */ + d = duk_get_number(thr, -1); /* integer, but may be +/- Infinite, +/- zero (not NaN, though) */ + duk_pop_nodecref_unsafe(thr); + + if (global) { + if (d < 0.0 || d > (double) DUK_HSTRING_GET_CHARLEN(h_input)) { + /* match fail */ + char_offset = 0; /* not really necessary */ + DUK_ASSERT(match == 0); + goto match_over; + } + char_offset = (duk_uint32_t) d; + } else { + /* lastIndex must be ignored for non-global regexps, but get the + * value for (theoretical) side effects. No side effects can + * really occur, because lastIndex is a normal property and is + * always non-configurable for RegExp instances. + */ + char_offset = (duk_uint32_t) 0; + } + + DUK_ASSERT(char_offset <= DUK_HSTRING_GET_CHARLEN(h_input)); + sp = re_ctx.input + duk_heap_strcache_offset_char2byte(thr, h_input, char_offset); + + /* + * Match loop. + * + * Try matching at different offsets until match found or input exhausted. + */ + + /* [ ... re_obj input bc saved_buf ] */ + + DUK_ASSERT(match == 0); + + for (;;) { + /* char offset in [0, h_input->clen] (both ends inclusive), checked before entry */ + DUK_ASSERT_DISABLE(char_offset >= 0); + DUK_ASSERT(char_offset <= DUK_HSTRING_GET_CHARLEN(h_input)); + + /* Note: re_ctx.steps is intentionally not reset, it applies to the entire unanchored match */ + DUK_ASSERT(re_ctx.recursion_depth == 0); + + DUK_DDD(DUK_DDDPRINT("attempt match at char offset %ld; %p [%p,%p]", + (long) char_offset, (const void *) sp, + (const void *) re_ctx.input, (const void *) re_ctx.input_end)); + + /* + * Note: + * + * - duk__match_regexp() is required not to longjmp() in ordinary "non-match" + * conditions; a longjmp() will terminate the entire matching process. + * + * - Clearing saved[] is not necessary because backtracking does it + * + * - Backtracking also rewinds re_ctx.recursion back to zero, unless an + * internal/limit error occurs (which causes a longjmp()) + * + * - If we supported anchored matches, we would break out here + * unconditionally; however, ECMAScript regexps don't have anchored + * matches. It might make sense to implement a fast bail-out if + * the regexp begins with '^' and sp is not 0: currently we'll just + * run through the entire input string, trivially failing the match + * at every non-zero offset. + */ + + if (duk__match_regexp(&re_ctx, re_ctx.bytecode, sp) != NULL) { + DUK_DDD(DUK_DDDPRINT("match at offset %ld", (long) char_offset)); + match = 1; + break; + } + + /* advance by one character (code point) and one char_offset */ + char_offset++; + if (char_offset > DUK_HSTRING_GET_CHARLEN(h_input)) { + /* + * Note: + * + * - Intentionally attempt (empty) match at char_offset == k_input->clen + * + * - Negative char_offsets have been eliminated and char_offset is duk_uint32_t + * -> no need or use for a negative check + */ + + DUK_DDD(DUK_DDDPRINT("no match after trying all sp offsets")); + break; + } + + /* avoid calling at end of input, will DUK_ERROR (above check suffices to avoid this) */ + (void) duk__utf8_advance(thr, &sp, re_ctx.input, re_ctx.input_end, (duk_uint_fast32_t) 1); + } + + match_over: + + /* + * Matching complete, create result array or return a 'null'. Update lastIndex + * if necessary. See E5 Section 15.10.6.2. + * + * Because lastIndex is a character (not byte) offset, we need the character + * length of the match which we conveniently get as a side effect of interning + * the matching substring (0th index of result array). + * + * saved[0] start pointer (~ byte offset) of current match + * saved[1] end pointer (~ byte offset) of current match (exclusive) + * char_offset start character offset of current match (-> .index of result) + * char_end_offset end character offset (computed below) + */ + + /* [ ... re_obj input bc saved_buf ] */ + + if (match) { +#if defined(DUK_USE_ASSERTIONS) + duk_hobject *h_res; +#endif + duk_uint32_t char_end_offset = 0; + + DUK_DDD(DUK_DDDPRINT("regexp matches at char_offset %ld", (long) char_offset)); + + DUK_ASSERT(re_ctx.nsaved >= 2); /* must have start and end */ + DUK_ASSERT((re_ctx.nsaved % 2) == 0); /* and even number */ + + /* XXX: Array size is known before and (2 * re_ctx.nsaved) but not taken + * advantage of now. The array is not compacted either, as regexp match + * objects are usually short lived. + */ + + duk_push_array(thr); + +#if defined(DUK_USE_ASSERTIONS) + h_res = duk_require_hobject(thr, -1); + DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(h_res)); + DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(h_res)); + DUK_ASSERT(DUK_HOBJECT_GET_CLASS_NUMBER(h_res) == DUK_HOBJECT_CLASS_ARRAY); +#endif + + /* [ ... re_obj input bc saved_buf res_obj ] */ + + duk_push_u32(thr, char_offset); + duk_xdef_prop_stridx_short_wec(thr, -2, DUK_STRIDX_INDEX); + + duk_dup_m4(thr); + duk_xdef_prop_stridx_short_wec(thr, -2, DUK_STRIDX_INPUT); + + for (i = 0; i < re_ctx.nsaved; i += 2) { + /* Captures which are undefined have NULL pointers and are returned + * as 'undefined'. The same is done when saved[] pointers are insane + * (this should, of course, never happen in practice). + */ + if (re_ctx.saved[i] && re_ctx.saved[i + 1] && re_ctx.saved[i + 1] >= re_ctx.saved[i]) { + duk_push_lstring(thr, + (const char *) re_ctx.saved[i], + (duk_size_t) (re_ctx.saved[i+1] - re_ctx.saved[i])); + if (i == 0) { + /* Assumes that saved[0] and saved[1] are always + * set by regexp bytecode (if not, char_end_offset + * will be zero). Also assumes clen reflects the + * correct char length. + */ + char_end_offset = char_offset + (duk_uint32_t) duk_get_length(thr, -1); /* add charlen */ + } + } else { + duk_push_undefined(thr); + } + + /* [ ... re_obj input bc saved_buf res_obj val ] */ + duk_put_prop_index(thr, -2, (duk_uarridx_t) (i / 2)); + } + + /* [ ... re_obj input bc saved_buf res_obj ] */ + + /* NB: 'length' property is automatically updated by the array setup loop */ + + if (global) { + /* global regexp: lastIndex updated on match */ + duk_push_u32(thr, char_end_offset); + duk_put_prop_stridx_short(thr, -6, DUK_STRIDX_LAST_INDEX); + } else { + /* non-global regexp: lastIndex never updated on match */ + ; + } + } else { + /* + * No match, E5 Section 15.10.6.2, step 9.a.i - 9.a.ii apply, regardless + * of 'global' flag of the RegExp. In particular, if lastIndex is invalid + * initially, it is reset to zero. + */ + + DUK_DDD(DUK_DDDPRINT("regexp does not match")); + + duk_push_null(thr); + + /* [ ... re_obj input bc saved_buf res_obj ] */ + + duk_push_int(thr, 0); + duk_put_prop_stridx_short(thr, -6, DUK_STRIDX_LAST_INDEX); + } + + /* [ ... re_obj input bc saved_buf res_obj ] */ + + duk_insert(thr, -5); + + /* [ ... res_obj re_obj input bc saved_buf ] */ + + duk_pop_n_unsafe(thr, 4); + + /* [ ... res_obj ] */ + + /* XXX: these last tricks are unnecessary if the function is made + * a genuine native function. + */ +} + +DUK_INTERNAL void duk_regexp_match(duk_hthread *thr) { + duk__regexp_match_helper(thr, 0 /*force_global*/); +} + +/* This variant is needed by String.prototype.split(); it needs to perform + * global-style matching on a cloned RegExp which is potentially non-global. + */ +DUK_INTERNAL void duk_regexp_match_force_global(duk_hthread *thr) { + duk__regexp_match_helper(thr, 1 /*force_global*/); +} + +#else /* DUK_USE_REGEXP_SUPPORT */ + +/* regexp support disabled */ + +#endif /* DUK_USE_REGEXP_SUPPORT */ +#line 1 "duk_selftest.c" +/* + * Self tests to ensure execution environment is sane. Intended to catch + * compiler/platform problems which cannot be detected at compile time. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_SELF_TESTS) + +/* + * Unions and structs for self tests + */ + +typedef union { + double d; + duk_uint8_t x[8]; +} duk__test_double_union; + +/* Self test failed. Expects a local variable 'error_count' to exist. */ +#define DUK__FAILED(msg) do { \ + DUK_D(DUK_DPRINT("self test failed: " #msg " at " DUK_FILE_MACRO ":" DUK_MACRO_STRINGIFY(DUK_LINE_MACRO))); \ + error_count++; \ + } while (0) + +#define DUK__DBLUNION_CMP_TRUE(a,b) do { \ + if (duk_memcmp((const void *) (a), (const void *) (b), sizeof(duk__test_double_union)) != 0) { \ + DUK__FAILED("double union compares false (expected true)"); \ + } \ + } while (0) + +#define DUK__DBLUNION_CMP_FALSE(a,b) do { \ + if (duk_memcmp((const void *) (a), (const void *) (b), sizeof(duk__test_double_union)) == 0) { \ + DUK__FAILED("double union compares true (expected false)"); \ + } \ + } while (0) + +typedef union { + duk_uint32_t i; + duk_uint8_t x[8]; +} duk__test_u32_union; + +#if defined(DUK_USE_INTEGER_LE) +#define DUK__U32_INIT(u, a, b, c, d) do { \ + (u)->x[0] = (d); (u)->x[1] = (c); (u)->x[2] = (b); (u)->x[3] = (a); \ + } while (0) +#elif defined(DUK_USE_INTEGER_ME) +#error integer mixed endian not supported now +#elif defined(DUK_USE_INTEGER_BE) +#define DUK__U32_INIT(u, a, b, c, d) do { \ + (u)->x[0] = (a); (u)->x[1] = (b); (u)->x[2] = (c); (u)->x[3] = (d); \ + } while (0) +#else +#error unknown integer endianness +#endif + +#if defined(DUK_USE_DOUBLE_LE) +#define DUK__DOUBLE_INIT(u, a, b, c, d, e, f, g, h) do { \ + (u)->x[0] = (h); (u)->x[1] = (g); (u)->x[2] = (f); (u)->x[3] = (e); \ + (u)->x[4] = (d); (u)->x[5] = (c); (u)->x[6] = (b); (u)->x[7] = (a); \ + } while (0) +#define DUK__DOUBLE_COMPARE(u, a, b, c, d, e, f, g, h) \ + ((u)->x[0] == (h) && (u)->x[1] == (g) && (u)->x[2] == (f) && (u)->x[3] == (e) && \ + (u)->x[4] == (d) && (u)->x[5] == (c) && (u)->x[6] == (b) && (u)->x[7] == (a)) +#elif defined(DUK_USE_DOUBLE_ME) +#define DUK__DOUBLE_INIT(u, a, b, c, d, e, f, g, h) do { \ + (u)->x[0] = (d); (u)->x[1] = (c); (u)->x[2] = (b); (u)->x[3] = (a); \ + (u)->x[4] = (h); (u)->x[5] = (g); (u)->x[6] = (f); (u)->x[7] = (e); \ + } while (0) +#define DUK__DOUBLE_COMPARE(u, a, b, c, d, e, f, g, h) \ + ((u)->x[0] == (d) && (u)->x[1] == (c) && (u)->x[2] == (b) && (u)->x[3] == (a) && \ + (u)->x[4] == (h) && (u)->x[5] == (g) && (u)->x[6] == (f) && (u)->x[7] == (e)) +#elif defined(DUK_USE_DOUBLE_BE) +#define DUK__DOUBLE_INIT(u, a, b, c, d, e, f, g, h) do { \ + (u)->x[0] = (a); (u)->x[1] = (b); (u)->x[2] = (c); (u)->x[3] = (d); \ + (u)->x[4] = (e); (u)->x[5] = (f); (u)->x[6] = (g); (u)->x[7] = (h); \ + } while (0) +#define DUK__DOUBLE_COMPARE(u, a, b, c, d, e, f, g, h) \ + ((u)->x[0] == (a) && (u)->x[1] == (b) && (u)->x[2] == (c) && (u)->x[3] == (d) && \ + (u)->x[4] == (e) && (u)->x[5] == (f) && (u)->x[6] == (g) && (u)->x[7] == (h)) +#else +#error unknown double endianness +#endif + +/* + * Various sanity checks for typing + */ + +DUK_LOCAL duk_uint_t duk__selftest_types(void) { + duk_uint_t error_count = 0; + + if (!(sizeof(duk_int8_t) == 1 && + sizeof(duk_uint8_t) == 1 && + sizeof(duk_int16_t) == 2 && + sizeof(duk_uint16_t) == 2 && + sizeof(duk_int32_t) == 4 && + sizeof(duk_uint32_t) == 4)) { + DUK__FAILED("duk_(u)int{8,16,32}_t size"); + } +#if defined(DUK_USE_64BIT_OPS) + if (!(sizeof(duk_int64_t) == 8 && + sizeof(duk_uint64_t) == 8)) { + DUK__FAILED("duk_(u)int64_t size"); + } +#endif + + if (!(sizeof(duk_size_t) >= sizeof(duk_uint_t))) { + /* Some internal code now assumes that all duk_uint_t values + * can be expressed with a duk_size_t. + */ + DUK__FAILED("duk_size_t is smaller than duk_uint_t"); + } + if (!(sizeof(duk_int_t) >= 4)) { + DUK__FAILED("duk_int_t is not 32 bits"); + } + + return error_count; +} + +/* + * Packed tval sanity + */ + +DUK_LOCAL duk_uint_t duk__selftest_packed_tval(void) { + duk_uint_t error_count = 0; + +#if defined(DUK_USE_PACKED_TVAL) + if (sizeof(void *) > 4) { + DUK__FAILED("packed duk_tval in use but sizeof(void *) > 4"); + } +#endif + + return error_count; +} + +/* + * Two's complement arithmetic. + */ + +DUK_LOCAL duk_uint_t duk__selftest_twos_complement(void) { + duk_uint_t error_count = 0; + volatile int test; + test = -1; + + /* Note that byte order doesn't affect this test: all bytes in + * 'test' will be 0xFF for two's complement. + */ + if (((volatile duk_uint8_t *) &test)[0] != (duk_uint8_t) 0xff) { + DUK__FAILED("two's complement arithmetic"); + } + + return error_count; +} + +/* + * Byte order. Important to self check, because on some exotic platforms + * there is no actual detection but rather assumption based on platform + * defines. + */ + +DUK_LOCAL duk_uint_t duk__selftest_byte_order(void) { + duk_uint_t error_count = 0; + duk__test_u32_union u1; + duk__test_double_union u2; + + /* + * >>> struct.pack('>d', 102030405060).encode('hex') + * '4237c17c6dc40000' + */ + + DUK__U32_INIT(&u1, 0xde, 0xad, 0xbe, 0xef); + DUK__DOUBLE_INIT(&u2, 0x42, 0x37, 0xc1, 0x7c, 0x6d, 0xc4, 0x00, 0x00); + + if (u1.i != (duk_uint32_t) 0xdeadbeefUL) { + DUK__FAILED("duk_uint32_t byte order"); + } + + if (u2.d != (double) 102030405060.0) { + DUK__FAILED("double byte order"); + } + + return error_count; +} + +/* + * DUK_BSWAP macros + */ + +DUK_LOCAL duk_uint_t duk__selftest_bswap_macros(void) { + duk_uint_t error_count = 0; + duk_uint32_t x32; + duk_uint16_t x16; + duk_double_union du; + duk_double_t du_diff; + + x16 = 0xbeefUL; + x16 = DUK_BSWAP16(x16); + if (x16 != (duk_uint16_t) 0xefbeUL) { + DUK__FAILED("DUK_BSWAP16"); + } + + x32 = 0xdeadbeefUL; + x32 = DUK_BSWAP32(x32); + if (x32 != (duk_uint32_t) 0xefbeaddeUL) { + DUK__FAILED("DUK_BSWAP32"); + } + + /* >>> struct.unpack('>d', '4000112233445566'.decode('hex')) + * (2.008366013071895,) + */ + + du.uc[0] = 0x40; du.uc[1] = 0x00; du.uc[2] = 0x11; du.uc[3] = 0x22; + du.uc[4] = 0x33; du.uc[5] = 0x44; du.uc[6] = 0x55; du.uc[7] = 0x66; + DUK_DBLUNION_DOUBLE_NTOH(&du); + du_diff = du.d - 2.008366013071895; +#if 0 + DUK_D(DUK_DPRINT("du_diff: %lg\n", (double) du_diff)); +#endif + if (du_diff > 1e-15) { + /* Allow very small lenience because some compilers won't parse + * exact IEEE double constants (happened in matrix testing with + * Linux gcc-4.8 -m32 at least). + */ +#if 0 + DUK_D(DUK_DPRINT("Result of DUK_DBLUNION_DOUBLE_NTOH: %02x %02x %02x %02x %02x %02x %02x %02x\n", + (unsigned int) du.uc[0], (unsigned int) du.uc[1], + (unsigned int) du.uc[2], (unsigned int) du.uc[3], + (unsigned int) du.uc[4], (unsigned int) du.uc[5], + (unsigned int) du.uc[6], (unsigned int) du.uc[7])); +#endif + DUK__FAILED("DUK_DBLUNION_DOUBLE_NTOH"); + } + + return error_count; +} + +/* + * Basic double / byte union memory layout. + */ + +DUK_LOCAL duk_uint_t duk__selftest_double_union_size(void) { + duk_uint_t error_count = 0; + + if (sizeof(duk__test_double_union) != 8) { + DUK__FAILED("invalid union size"); + } + + return error_count; +} + +/* + * Union aliasing, see misc/clang_aliasing.c. + */ + +DUK_LOCAL duk_uint_t duk__selftest_double_aliasing(void) { + /* This testcase fails when Emscripten-generated code runs on Firefox. + * It's not an issue because the failure should only affect packed + * duk_tval representation, which is not used with Emscripten. + */ +#if defined(DUK_USE_PACKED_TVAL) + duk_uint_t error_count = 0; + duk__test_double_union a, b; + + /* Test signaling NaN and alias assignment in all endianness combinations. + */ + + /* little endian */ + a.x[0] = 0x11; a.x[1] = 0x22; a.x[2] = 0x33; a.x[3] = 0x44; + a.x[4] = 0x00; a.x[5] = 0x00; a.x[6] = 0xf1; a.x[7] = 0xff; + b = a; + DUK__DBLUNION_CMP_TRUE(&a, &b); + + /* big endian */ + a.x[0] = 0xff; a.x[1] = 0xf1; a.x[2] = 0x00; a.x[3] = 0x00; + a.x[4] = 0x44; a.x[5] = 0x33; a.x[6] = 0x22; a.x[7] = 0x11; + b = a; + DUK__DBLUNION_CMP_TRUE(&a, &b); + + /* mixed endian */ + a.x[0] = 0x00; a.x[1] = 0x00; a.x[2] = 0xf1; a.x[3] = 0xff; + a.x[4] = 0x11; a.x[5] = 0x22; a.x[6] = 0x33; a.x[7] = 0x44; + b = a; + DUK__DBLUNION_CMP_TRUE(&a, &b); + + return error_count; +#else + DUK_D(DUK_DPRINT("skip double aliasing self test when duk_tval is not packed")); + return 0; +#endif +} + +/* + * Zero sign, see misc/tcc_zerosign2.c. + */ + +DUK_LOCAL duk_uint_t duk__selftest_double_zero_sign(void) { + duk_uint_t error_count = 0; + duk__test_double_union a, b; + + a.d = 0.0; + b.d = -a.d; + DUK__DBLUNION_CMP_FALSE(&a, &b); + + return error_count; +} + +/* + * Rounding mode: Duktape assumes round-to-nearest, check that this is true. + * If we had C99 fenv.h we could check that fegetround() == FE_TONEAREST, + * but we don't want to rely on that header; and even if we did, it's good + * to ensure the rounding actually works. + */ + +DUK_LOCAL duk_uint_t duk__selftest_double_rounding(void) { + duk_uint_t error_count = 0; + duk__test_double_union a, b, c; + +#if 0 + /* Include <fenv.h> and test manually; these trigger failures: */ + fesetround(FE_UPWARD); + fesetround(FE_DOWNWARD); + fesetround(FE_TOWARDZERO); + + /* This is the default and passes. */ + fesetround(FE_TONEAREST); +#endif + + /* Rounding tests check that none of the other modes (round to + * +Inf, round to -Inf, round to zero) can be active: + * http://www.gnu.org/software/libc/manual/html_node/Rounding.html + */ + + /* 1.0 + 2^(-53): result is midway between 1.0 and 1.0 + ulp. + * Round to nearest: 1.0 + * Round to +Inf: 1.0 + ulp + * Round to -Inf: 1.0 + * Round to zero: 1.0 + * => Correct result eliminates round to +Inf. + */ + DUK__DOUBLE_INIT(&a, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00); + DUK__DOUBLE_INIT(&b, 0x3c, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00); + duk_memset((void *) &c, 0, sizeof(c)); + c.d = a.d + b.d; + if (!DUK__DOUBLE_COMPARE(&c, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)) { + DUK_D(DUK_DPRINT("broken result (native endiannesss): %02x %02x %02x %02x %02x %02x %02x %02x", + (unsigned int) c.x[0], (unsigned int) c.x[1], + (unsigned int) c.x[2], (unsigned int) c.x[3], + (unsigned int) c.x[4], (unsigned int) c.x[5], + (unsigned int) c.x[6], (unsigned int) c.x[7])); + DUK__FAILED("invalid result from 1.0 + 0.5ulp"); + } + + /* (1.0 + ulp) + 2^(-53): result is midway between 1.0 + ulp and 1.0 + 2*ulp. + * Round to nearest: 1.0 + 2*ulp (round to even mantissa) + * Round to +Inf: 1.0 + 2*ulp + * Round to -Inf: 1.0 + ulp + * Round to zero: 1.0 + ulp + * => Correct result eliminates round to -Inf and round to zero. + */ + DUK__DOUBLE_INIT(&a, 0x3f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01); + DUK__DOUBLE_INIT(&b, 0x3c, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00); + duk_memset((void *) &c, 0, sizeof(c)); + c.d = a.d + b.d; + if (!DUK__DOUBLE_COMPARE(&c, 0x3f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02)) { + DUK_D(DUK_DPRINT("broken result (native endiannesss): %02x %02x %02x %02x %02x %02x %02x %02x", + (unsigned int) c.x[0], (unsigned int) c.x[1], + (unsigned int) c.x[2], (unsigned int) c.x[3], + (unsigned int) c.x[4], (unsigned int) c.x[5], + (unsigned int) c.x[6], (unsigned int) c.x[7])); + DUK__FAILED("invalid result from (1.0 + ulp) + 0.5ulp"); + } + + /* Could do negative number testing too, but the tests above should + * differentiate between IEEE 754 rounding modes. + */ + return error_count; +} + +/* + * fmod(): often a portability issue in embedded or bare platform targets. + * Check for at least minimally correct behavior. Unlike some other math + * functions (like cos()) Duktape relies on fmod() internally too. + */ + +DUK_LOCAL duk_uint_t duk__selftest_fmod(void) { + duk_uint_t error_count = 0; + duk__test_double_union u1, u2; + volatile duk_double_t t1, t2, t3; + + /* fmod() with integer argument and exponent 2^32 is used by e.g. + * ToUint32() and some Duktape internals. + */ + u1.d = DUK_FMOD(10.0, 4294967296.0); + u2.d = 10.0; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + u1.d = DUK_FMOD(4294967306.0, 4294967296.0); + u2.d = 10.0; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + u1.d = DUK_FMOD(73014444042.0, 4294967296.0); + u2.d = 10.0; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + /* 52-bit integer split into two parts: + * >>> 0x1fedcba9876543 + * 8987183256397123 + * >>> float(0x1fedcba9876543) / float(2**53) + * 0.9977777777777778 + */ + u1.d = DUK_FMOD(8987183256397123.0, 4294967296.0); + u2.d = (duk_double_t) 0xa9876543UL; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + t1 = 8987183256397123.0; + t2 = 4294967296.0; + t3 = t1 / t2; + u1.d = DUK_FLOOR(t3); + u2.d = (duk_double_t) 0x1fedcbUL; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + /* C99 behavior is for fmod() result sign to mathc argument sign. */ + u1.d = DUK_FMOD(-10.0, 4294967296.0); + u2.d = -10.0; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + u1.d = DUK_FMOD(-4294967306.0, 4294967296.0); + u2.d = -10.0; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + u1.d = DUK_FMOD(-73014444042.0, 4294967296.0); + u2.d = -10.0; + DUK__DBLUNION_CMP_TRUE(&u1, &u2); + + return error_count; +} + +/* + * Struct size/alignment if platform requires it + * + * There are some compiler specific struct padding pragmas etc in use, this + * selftest ensures they're correctly detected and used. + */ + +DUK_LOCAL duk_uint_t duk__selftest_struct_align(void) { + duk_uint_t error_count = 0; + +#if (DUK_USE_ALIGN_BY == 4) + if ((sizeof(duk_hbuffer_fixed) % 4) != 0) { + DUK__FAILED("sizeof(duk_hbuffer_fixed) not aligned to 4"); + } +#elif (DUK_USE_ALIGN_BY == 8) + if ((sizeof(duk_hbuffer_fixed) % 8) != 0) { + DUK__FAILED("sizeof(duk_hbuffer_fixed) not aligned to 8"); + } +#elif (DUK_USE_ALIGN_BY == 1) + /* no check */ +#else +#error invalid DUK_USE_ALIGN_BY +#endif + return error_count; +} + +/* + * 64-bit arithmetic + * + * There are some platforms/compilers where 64-bit types are available + * but don't work correctly. Test for known cases. + */ + +DUK_LOCAL duk_uint_t duk__selftest_64bit_arithmetic(void) { + duk_uint_t error_count = 0; +#if defined(DUK_USE_64BIT_OPS) + volatile duk_int64_t i; + volatile duk_double_t d; + + /* Catch a double-to-int64 cast issue encountered in practice. */ + d = 2147483648.0; + i = (duk_int64_t) d; + if (i != DUK_I64_CONSTANT(0x80000000)) { + DUK__FAILED("casting 2147483648.0 to duk_int64_t failed"); + } +#else + /* nop */ +#endif + return error_count; +} + +/* + * Casting + */ + +DUK_LOCAL duk_uint_t duk__selftest_cast_double_to_small_uint(void) { + /* + * https://github.com/svaarala/duktape/issues/127#issuecomment-77863473 + */ + + duk_uint_t error_count = 0; + + duk_double_t d1, d2; + duk_small_uint_t u; + + duk_double_t d1v, d2v; + duk_small_uint_t uv; + + /* Test without volatiles */ + + d1 = 1.0; + u = (duk_small_uint_t) d1; + d2 = (duk_double_t) u; + + if (!(d1 == 1.0 && u == 1 && d2 == 1.0 && d1 == d2)) { + DUK__FAILED("double to duk_small_uint_t cast failed"); + } + + /* Same test with volatiles */ + + d1v = 1.0; + uv = (duk_small_uint_t) d1v; + d2v = (duk_double_t) uv; + + if (!(d1v == 1.0 && uv == 1 && d2v == 1.0 && d1v == d2v)) { + DUK__FAILED("double to duk_small_uint_t cast failed"); + } + + return error_count; +} + +DUK_LOCAL duk_uint_t duk__selftest_cast_double_to_uint32(void) { + /* + * This test fails on an exotic ARM target; double-to-uint + * cast is incorrectly clamped to -signed- int highest value. + * + * https://github.com/svaarala/duktape/issues/336 + */ + + duk_uint_t error_count = 0; + duk_double_t dv; + duk_uint32_t uv; + + dv = 3735928559.0; /* 0xdeadbeef in decimal */ + uv = (duk_uint32_t) dv; + + if (uv != 0xdeadbeefUL) { + DUK__FAILED("double to duk_uint32_t cast failed"); + } + + return error_count; +} + +/* + * Minimal test of user supplied allocation functions + * + * - Basic alloc + realloc + free cycle + * + * - Realloc to significantly larger size to (hopefully) trigger a + * relocation and check that relocation copying works + */ + +DUK_LOCAL duk_uint_t duk__selftest_alloc_funcs(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *udata) { + duk_uint_t error_count = 0; + void *ptr; + void *new_ptr; + duk_small_int_t i, j; + unsigned char x; + + if (alloc_func == NULL || realloc_func == NULL || free_func == NULL) { + return 0; + } + + for (i = 1; i <= 256; i++) { + ptr = alloc_func(udata, (duk_size_t) i); + if (ptr == NULL) { + DUK_D(DUK_DPRINT("alloc failed, ignore")); + continue; /* alloc failed, ignore */ + } + for (j = 0; j < i; j++) { + ((unsigned char *) ptr)[j] = (unsigned char) (0x80 + j); + } + new_ptr = realloc_func(udata, ptr, 1024); + if (new_ptr == NULL) { + DUK_D(DUK_DPRINT("realloc failed, ignore")); + free_func(udata, ptr); + continue; /* realloc failed, ignore */ + } + ptr = new_ptr; + for (j = 0; j < i; j++) { + x = ((unsigned char *) ptr)[j]; + if (x != (unsigned char) (0x80 + j)) { + DUK_D(DUK_DPRINT("byte at index %ld doesn't match after realloc: %02lx", + (long) j, (unsigned long) x)); + DUK__FAILED("byte compare after realloc"); + break; + } + } + free_func(udata, ptr); + } + + return error_count; +} + +/* + * Self test main + */ + +DUK_INTERNAL duk_uint_t duk_selftest_run_tests(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *udata) { + duk_uint_t error_count = 0; + + DUK_D(DUK_DPRINT("self test starting")); + + error_count += duk__selftest_types(); + error_count += duk__selftest_packed_tval(); + error_count += duk__selftest_twos_complement(); + error_count += duk__selftest_byte_order(); + error_count += duk__selftest_bswap_macros(); + error_count += duk__selftest_double_union_size(); + error_count += duk__selftest_double_aliasing(); + error_count += duk__selftest_double_zero_sign(); + error_count += duk__selftest_double_rounding(); + error_count += duk__selftest_fmod(); + error_count += duk__selftest_struct_align(); + error_count += duk__selftest_64bit_arithmetic(); + error_count += duk__selftest_cast_double_to_small_uint(); + error_count += duk__selftest_cast_double_to_uint32(); + error_count += duk__selftest_alloc_funcs(alloc_func, realloc_func, free_func, udata); + + DUK_D(DUK_DPRINT("self test complete, total error count: %ld", (long) error_count)); + + return error_count; +} + +#endif /* DUK_USE_SELF_TESTS */ + +/* automatic undefs */ +#undef DUK__DBLUNION_CMP_FALSE +#undef DUK__DBLUNION_CMP_TRUE +#undef DUK__DOUBLE_COMPARE +#undef DUK__DOUBLE_INIT +#undef DUK__FAILED +#undef DUK__U32_INIT +/* #include duk_internal.h -> already included */ +#line 2 "duk_tval.c" + +#if defined(DUK_USE_FASTINT) + +/* + * Manually optimized double-to-fastint downgrade check. + * + * This check has a large impact on performance, especially for fastint + * slow paths, so must be changed carefully. The code should probably be + * optimized for the case where the result does not fit into a fastint, + * to minimize the penalty for "slow path code" dealing with fractions etc. + * + * At least on one tested soft float ARM platform double-to-int64 coercion + * is very slow (and sometimes produces incorrect results, see self tests). + * This algorithm combines a fastint compatibility check and extracting the + * integer value from an IEEE double for setting the tagged fastint. For + * other platforms a more naive approach might be better. + * + * See doc/fastint.rst for details. + */ + +DUK_INTERNAL DUK_ALWAYS_INLINE void duk_tval_set_number_chkfast_fast(duk_tval *tv, duk_double_t x) { + duk_double_union du; + duk_int64_t i; + duk_small_int_t expt; + duk_small_int_t shift; + + /* XXX: optimize for packed duk_tval directly? */ + + du.d = x; + i = (duk_int64_t) DUK_DBLUNION_GET_INT64(&du); + expt = (duk_small_int_t) ((i >> 52) & 0x07ff); + shift = expt - 1023; + + if (shift >= 0 && shift <= 46) { /* exponents 1023 to 1069 */ + duk_int64_t t; + + if (((DUK_I64_CONSTANT(0x000fffffffffffff) >> shift) & i) == 0) { + t = i | DUK_I64_CONSTANT(0x0010000000000000); /* implicit leading one */ + t = t & DUK_I64_CONSTANT(0x001fffffffffffff); + t = t >> (52 - shift); + if (i < 0) { + t = -t; + } + DUK_TVAL_SET_FASTINT(tv, t); + return; + } + } else if (shift == -1023) { /* exponent 0 */ + if (i >= 0 && (i & DUK_I64_CONSTANT(0x000fffffffffffff)) == 0) { + /* Note: reject negative zero. */ + DUK_TVAL_SET_FASTINT(tv, (duk_int64_t) 0); + return; + } + } else if (shift == 47) { /* exponent 1070 */ + if (i < 0 && (i & DUK_I64_CONSTANT(0x000fffffffffffff)) == 0) { + DUK_TVAL_SET_FASTINT(tv, (duk_int64_t) DUK_FASTINT_MIN); + return; + } + } + + DUK_TVAL_SET_DOUBLE(tv, x); + return; +} + +DUK_INTERNAL DUK_NOINLINE void duk_tval_set_number_chkfast_slow(duk_tval *tv, duk_double_t x) { + duk_tval_set_number_chkfast_fast(tv, x); +} + +/* + * Manually optimized number-to-double conversion + */ + +#if defined(DUK_USE_FASTINT) && defined(DUK_USE_PACKED_TVAL) +DUK_INTERNAL DUK_ALWAYS_INLINE duk_double_t duk_tval_get_number_packed(duk_tval *tv) { + duk_double_union du; + duk_uint64_t t; + + t = (duk_uint64_t) DUK_DBLUNION_GET_UINT64(tv); + if ((t >> 48) != DUK_TAG_FASTINT) { + return tv->d; + } else if (t & DUK_U64_CONSTANT(0x0000800000000000)) { + t = (duk_uint64_t) (-((duk_int64_t) t)); /* avoid unary minus on unsigned */ + t = t & DUK_U64_CONSTANT(0x0000ffffffffffff); /* negative */ + t |= DUK_U64_CONSTANT(0xc330000000000000); + DUK_DBLUNION_SET_UINT64(&du, t); + return du.d + 4503599627370496.0; /* 1 << 52 */ + } else if (t != 0) { + t &= DUK_U64_CONSTANT(0x0000ffffffffffff); /* positive */ + t |= DUK_U64_CONSTANT(0x4330000000000000); + DUK_DBLUNION_SET_UINT64(&du, t); + return du.d - 4503599627370496.0; /* 1 << 52 */ + } else { + return 0.0; /* zero */ + } +} +#endif /* DUK_USE_FASTINT && DUK_USE_PACKED_TVAL */ + +#if 0 /* unused */ +#if defined(DUK_USE_FASTINT) && !defined(DUK_USE_PACKED_TVAL) +DUK_INTERNAL DUK_ALWAYS_INLINE duk_double_t duk_tval_get_number_unpacked(duk_tval *tv) { + duk_double_union du; + duk_uint64_t t; + + DUK_ASSERT(tv->t == DUK_TAG_NUMBER || tv->t == DUK_TAG_FASTINT); + + if (tv->t == DUK_TAG_FASTINT) { + if (tv->v.fi >= 0) { + t = DUK_U64_CONSTANT(0x4330000000000000) | (duk_uint64_t) tv->v.fi; + DUK_DBLUNION_SET_UINT64(&du, t); + return du.d - 4503599627370496.0; /* 1 << 52 */ + } else { + t = DUK_U64_CONSTANT(0xc330000000000000) | (duk_uint64_t) (-tv->v.fi); + DUK_DBLUNION_SET_UINT64(&du, t); + return du.d + 4503599627370496.0; /* 1 << 52 */ + } + } else { + return tv->v.d; + } +} +#endif /* DUK_USE_FASTINT && DUK_USE_PACKED_TVAL */ +#endif /* 0 */ + +#if defined(DUK_USE_FASTINT) && !defined(DUK_USE_PACKED_TVAL) +DUK_INTERNAL DUK_ALWAYS_INLINE duk_double_t duk_tval_get_number_unpacked_fastint(duk_tval *tv) { + duk_double_union du; + duk_uint64_t t; + + DUK_ASSERT(tv->t == DUK_TAG_FASTINT); + + if (tv->v.fi >= 0) { + t = DUK_U64_CONSTANT(0x4330000000000000) | (duk_uint64_t) tv->v.fi; + DUK_DBLUNION_SET_UINT64(&du, t); + return du.d - 4503599627370496.0; /* 1 << 52 */ + } else { + t = DUK_U64_CONSTANT(0xc330000000000000) | (duk_uint64_t) (-tv->v.fi); + DUK_DBLUNION_SET_UINT64(&du, t); + return du.d + 4503599627370496.0; /* 1 << 52 */ + } +} +#endif /* DUK_USE_FASTINT && DUK_USE_PACKED_TVAL */ + +#endif /* DUK_USE_FASTINT */ +#line 1 "duk_unicode_tables.c" +/* + * Unicode support tables automatically generated during build. + */ + +/* #include duk_internal.h -> already included */ + +/* + * Unicode tables containing ranges of Unicode characters in a + * packed format. These tables are used to match non-ASCII + * characters of complex productions by resorting to a linear + * range-by-range comparison. This is very slow, but is expected + * to be very rare in practical ECMAScript source code, and thus + * compactness is most important. + * + * The tables are matched using uni_range_match() and the format + * is described in tools/extract_chars.py. + */ + +#if defined(DUK_USE_SOURCE_NONBMP) +/* IdentifierStart production with ASCII excluded */ +/* duk_unicode_ids_noa[] */ +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +const duk_uint8_t duk_unicode_ids_noa[1063] = { +249,176,176,80,111,7,47,15,47,254,11,197,191,0,72,2,15,115,66,19,50,7,2,34, +2,240,66,244,50,247,185,249,98,241,99,8,241,127,58,240,182,47,31,241,191, +21,18,245,50,15,1,24,27,35,15,2,2,240,239,15,244,156,15,10,241,26,21,6,240, +101,10,4,15,9,240,152,175,39,240,82,127,56,242,100,15,4,8,159,1,240,5,115, +19,240,98,98,4,52,15,2,14,18,47,0,27,9,85,19,240,98,98,18,18,31,17,50,15,5, +47,2,130,34,240,98,98,18,68,15,4,15,1,31,9,12,115,19,240,98,98,18,68,15,16, +18,47,1,15,3,2,84,34,52,18,2,20,20,36,191,8,15,38,114,34,240,114,240,4,15, +12,38,31,16,5,114,34,240,114,146,68,15,18,2,31,1,31,4,114,34,241,147,15,2, +6,41,47,10,86,240,36,240,130,130,3,111,44,242,2,29,111,44,18,3,18,3,7,50, +98,34,2,3,18,50,26,3,66,15,7,63,18,15,49,114,241,79,13,79,101,241,191,6,15, +2,85,52,4,24,37,205,15,3,241,98,6,3,241,178,255,224,63,35,54,32,35,63,25, +35,63,17,35,54,32,35,62,47,41,35,63,51,241,127,0,240,47,70,53,79,254,21, +227,240,18,240,166,243,180,168,194,63,0,240,47,0,240,47,0,194,47,1,242,79, +21,5,15,53,244,137,67,241,34,6,243,107,240,255,35,240,227,76,241,197,240, +175,40,240,122,242,95,68,15,79,241,255,3,111,41,240,238,27,241,207,12,241, +79,27,43,241,67,143,82,50,52,26,251,15,50,255,224,8,53,63,22,53,55,32,32, +32,47,15,63,37,38,32,66,38,67,53,92,98,38,246,96,224,240,44,245,112,80,57, +32,68,112,32,32,35,42,51,100,80,240,63,25,255,233,107,241,242,241,242,247, +87,52,29,241,98,6,3,242,136,15,2,240,122,98,98,98,98,98,98,98,111,66,15, +254,12,146,240,184,132,52,95,70,114,47,74,35,111,26,63,78,240,63,11,242, +127,0,255,224,244,255,240,0,138,143,60,255,240,4,13,223,7,255,227,127,243, +95,30,63,253,79,0,177,240,111,31,240,47,15,63,64,241,152,63,87,63,20,39, +243,26,34,35,47,7,240,255,36,240,15,34,243,5,64,32,223,12,191,7,240,191,13, +143,31,240,224,240,36,41,180,47,25,240,146,39,240,111,7,64,79,34,32,65,52, +48,32,240,162,58,130,213,53,53,166,38,47,27,41,191,99,240,255,255,0,26,150, +223,7,95,33,255,240,0,255,143,254,6,3,245,175,24,109,70,2,146,194,66,2,18, +18,245,207,19,255,224,93,240,79,48,63,38,241,171,246,100,47,119,241,111,10, +127,10,207,73,69,53,53,50,241,91,47,10,47,3,33,46,61,241,79,107,243,127,37, +255,223,13,79,33,242,31,16,239,14,111,22,191,14,63,20,87,36,241,207,142, +240,79,20,95,20,95,24,159,36,248,239,254,2,154,240,107,127,138,83,2,241, +194,20,3,240,123,240,122,240,255,51,240,50,27,240,107,240,175,56,242,135, +31,50,15,1,50,34,240,191,30,240,212,240,223,21,114,240,207,13,242,107,240, +107,240,62,240,47,96,243,159,41,242,62,242,63,254,32,79,37,243,223,29,241, +47,9,240,207,20,241,191,19,64,223,32,240,3,240,112,32,241,95,2,47,9,244, +102,32,35,46,41,143,31,241,135,49,63,6,38,33,36,64,240,64,212,249,15,37, +240,67,242,127,32,240,97,32,250,175,31,241,179,241,111,32,240,96,242,223, +27,244,127,10,255,224,122,243,15,17,15,242,11,241,136,15,7,12,241,131,63, +40,242,159,249,130,241,95,3,15,35,240,239,98,98,18,241,111,7,15,254,26,223, +254,40,207,88,245,255,3,251,79,254,155,15,254,50,31,254,236,95,254,19,159, +255,0,16,173,255,225,43,143,15,246,63,14,240,79,32,240,35,241,31,5,111,3, +255,226,100,243,92,15,52,207,50,31,16,255,240,0,109,255,5,255,225,229,255, +240,1,64,31,254,1,31,67,255,224,126,255,231,248,245,182,196,136,159,255,0, +6,90,244,82,243,114,19,3,19,50,178,2,98,243,18,51,114,98,240,194,50,66,4, +98,255,224,70,63,9,47,9,47,15,47,9,47,15,47,9,47,15,47,9,47,15,47,9,39,255, +239,40,251,95,45,243,79,254,59,3,47,11,33,32,48,41,35,32,32,112,80,32,32, +34,33,32,48,32,32,32,32,33,32,51,38,35,35,32,41,47,1,98,36,47,1,255,240,0, +3,143,255,0,149,201,241,191,254,242,124,252,227,255,240,0,87,79,0,255,240, +0,194,63,254,177,63,254,17,0, +}; +#else +/* IdentifierStart production with ASCII and non-BMP excluded */ +/* duk_unicode_ids_noabmp[] */ +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +const duk_uint8_t duk_unicode_ids_noabmp[626] = { +249,176,176,80,111,7,47,15,47,254,11,197,191,0,72,2,15,115,66,19,50,7,2,34, +2,240,66,244,50,247,185,249,98,241,99,8,241,127,58,240,182,47,31,241,191, +21,18,245,50,15,1,24,27,35,15,2,2,240,239,15,244,156,15,10,241,26,21,6,240, +101,10,4,15,9,240,152,175,39,240,82,127,56,242,100,15,4,8,159,1,240,5,115, +19,240,98,98,4,52,15,2,14,18,47,0,27,9,85,19,240,98,98,18,18,31,17,50,15,5, +47,2,130,34,240,98,98,18,68,15,4,15,1,31,9,12,115,19,240,98,98,18,68,15,16, +18,47,1,15,3,2,84,34,52,18,2,20,20,36,191,8,15,38,114,34,240,114,240,4,15, +12,38,31,16,5,114,34,240,114,146,68,15,18,2,31,1,31,4,114,34,241,147,15,2, +6,41,47,10,86,240,36,240,130,130,3,111,44,242,2,29,111,44,18,3,18,3,7,50, +98,34,2,3,18,50,26,3,66,15,7,63,18,15,49,114,241,79,13,79,101,241,191,6,15, +2,85,52,4,24,37,205,15,3,241,98,6,3,241,178,255,224,63,35,54,32,35,63,25, +35,63,17,35,54,32,35,62,47,41,35,63,51,241,127,0,240,47,70,53,79,254,21, +227,240,18,240,166,243,180,168,194,63,0,240,47,0,240,47,0,194,47,1,242,79, +21,5,15,53,244,137,67,241,34,6,243,107,240,255,35,240,227,76,241,197,240, +175,40,240,122,242,95,68,15,79,241,255,3,111,41,240,238,27,241,207,12,241, +79,27,43,241,67,143,82,50,52,26,251,15,50,255,224,8,53,63,22,53,55,32,32, +32,47,15,63,37,38,32,66,38,67,53,92,98,38,246,96,224,240,44,245,112,80,57, +32,68,112,32,32,35,42,51,100,80,240,63,25,255,233,107,241,242,241,242,247, +87,52,29,241,98,6,3,242,136,15,2,240,122,98,98,98,98,98,98,98,111,66,15, +254,12,146,240,184,132,52,95,70,114,47,74,35,111,26,63,78,240,63,11,242, +127,0,255,224,244,255,240,0,138,143,60,255,240,4,13,223,7,255,227,127,243, +95,30,63,253,79,0,177,240,111,31,240,47,15,63,64,241,152,63,87,63,20,39, +243,26,34,35,47,7,240,255,36,240,15,34,243,5,64,32,223,12,191,7,240,191,13, +143,31,240,224,240,36,41,180,47,25,240,146,39,240,111,7,64,79,34,32,65,52, +48,32,240,162,58,130,213,53,53,166,38,47,27,41,191,99,240,255,255,0,26,150, +223,7,95,33,255,240,0,255,143,254,6,3,245,175,24,109,70,2,146,194,66,2,18, +18,245,207,19,255,224,93,240,79,48,63,38,241,171,246,100,47,119,241,111,10, +127,10,207,73,69,53,53,50,0, +}; +#endif + +#if defined(DUK_USE_SOURCE_NONBMP) +/* IdentifierStart production with Letter and ASCII excluded */ +/* duk_unicode_ids_m_let_noa[] */ +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +const duk_uint8_t duk_unicode_ids_m_let_noa[42] = { +255,240,0,94,18,255,233,99,241,51,63,254,215,32,240,184,240,2,255,240,6,89, +249,255,240,4,148,79,37,255,224,192,9,15,120,79,255,0,15,30,245,240, +}; +#else +/* IdentifierStart production with Letter, ASCII, and non-BMP excluded */ +/* duk_unicode_ids_m_let_noabmp[] */ +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +const duk_uint8_t duk_unicode_ids_m_let_noabmp[24] = { +255,240,0,94,18,255,233,99,241,51,63,254,215,32,240,184,240,2,255,240,6,89, +249,0, +}; +#endif + +#if defined(DUK_USE_SOURCE_NONBMP) +/* IdentifierPart production with IdentifierStart and ASCII excluded */ +/* duk_unicode_idp_m_ids_noa[] */ +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +const duk_uint8_t duk_unicode_idp_m_ids_noa[549] = { +255,225,243,246,15,254,0,116,255,191,29,32,33,33,32,243,170,242,47,15,112, +245,118,53,49,35,57,240,144,241,15,11,244,218,240,25,241,56,241,67,40,34, +36,241,210,246,173,47,17,242,130,47,2,38,177,57,240,50,242,160,38,49,50, +160,177,57,240,50,242,160,36,81,50,64,240,107,64,194,242,160,39,34,34,240, +97,57,181,34,242,160,38,49,50,145,177,57,240,64,242,212,66,35,160,240,9, +240,35,242,198,34,35,129,193,57,240,50,242,160,38,34,35,129,193,57,240,35, +242,145,38,34,35,160,177,57,240,65,243,128,85,32,39,121,49,242,240,54,215, +41,244,144,53,33,197,57,243,1,121,192,32,32,81,242,63,4,33,106,47,20,160, +245,111,4,41,211,82,34,54,67,235,46,255,225,179,47,254,42,98,240,242,240, +241,241,1,243,47,16,160,57,241,50,57,245,209,241,64,246,139,91,185,247,41, +242,244,242,185,47,13,58,121,240,141,243,68,242,31,1,201,240,56,210,241,12, +57,241,237,242,47,4,153,121,246,130,47,5,80,82,50,251,143,42,36,255,225,0, +31,35,31,5,15,109,197,4,191,254,175,34,247,240,245,47,16,255,225,30,95,91, +31,255,0,100,121,159,55,5,159,18,31,66,31,254,0,64,64,80,240,148,244,161, +242,79,2,185,127,2,240,9,240,231,240,188,241,227,242,29,240,25,192,185,242, +29,208,145,57,241,50,242,64,34,49,97,32,241,180,97,253,231,33,57,255,240,3, +225,128,255,225,213,240,15,2,240,4,31,10,47,178,159,23,15,254,27,16,253,64, +248,116,255,224,25,159,254,68,178,33,99,241,162,80,249,113,255,228,13,47, +39,239,17,159,1,63,31,175,39,151,47,22,210,159,37,13,47,34,218,36,159,68, +183,15,146,182,151,63,42,2,99,19,42,11,19,100,79,178,240,42,159,72,240,77, +159,199,99,143,13,31,68,240,31,1,159,67,201,159,69,229,159,254,9,169,255, +224,11,159,26,98,57,10,175,32,240,15,254,8,151,39,240,41,242,175,6,45,246, +197,64,33,38,32,153,255,240,3,191,169,247,132,242,214,240,185,255,226,235, +241,239,2,63,255,0,59,254,31,255,0,3,186,68,89,115,111,16,63,134,47,254,71, +223,34,255,224,244,242,117,242,41,15,0,15,8,66,239,254,68,70,47,1,54,33,36, +255,231,153,111,95,102,159,255,12,6,154,254,0, +}; +#else +/* IdentifierPart production with IdentifierStart, ASCII, and non-BMP excluded */ +/* duk_unicode_idp_m_ids_noabmp[] */ +/* + * Automatically generated by extract_chars.py, do not edit! + */ + +const duk_uint8_t duk_unicode_idp_m_ids_noabmp[358] = { +255,225,243,246,15,254,0,116,255,191,29,32,33,33,32,243,170,242,47,15,112, +245,118,53,49,35,57,240,144,241,15,11,244,218,240,25,241,56,241,67,40,34, +36,241,210,246,173,47,17,242,130,47,2,38,177,57,240,50,242,160,38,49,50, +160,177,57,240,50,242,160,36,81,50,64,240,107,64,194,242,160,39,34,34,240, +97,57,181,34,242,160,38,49,50,145,177,57,240,64,242,212,66,35,160,240,9, +240,35,242,198,34,35,129,193,57,240,50,242,160,38,34,35,129,193,57,240,35, +242,145,38,34,35,160,177,57,240,65,243,128,85,32,39,121,49,242,240,54,215, +41,244,144,53,33,197,57,243,1,121,192,32,32,81,242,63,4,33,106,47,20,160, +245,111,4,41,211,82,34,54,67,235,46,255,225,179,47,254,42,98,240,242,240, +241,241,1,243,47,16,160,57,241,50,57,245,209,241,64,246,139,91,185,247,41, +242,244,242,185,47,13,58,121,240,141,243,68,242,31,1,201,240,56,210,241,12, +57,241,237,242,47,4,153,121,246,130,47,5,80,82,50,251,143,42,36,255,225,0, +31,35,31,5,15,109,197,4,191,254,175,34,247,240,245,47,16,255,225,30,95,91, +31,255,0,100,121,159,55,5,159,18,31,66,31,254,0,64,64,80,240,148,244,161, +242,79,2,185,127,2,240,9,240,231,240,188,241,227,242,29,240,25,192,185,242, +29,208,145,57,241,50,242,64,34,49,97,32,241,180,97,253,231,33,57,255,240,3, +225,128,255,225,213,240,15,2,240,4,31,10,47,178,159,23,0, +}; +#endif + +/* + * Case conversion tables generated using tools/extract_caseconv.py. + */ + +/* duk_unicode_caseconv_uc[] */ +/* duk_unicode_caseconv_lc[] */ + +/* + * Automatically generated by extract_caseconv.py, do not edit! + */ + +const duk_uint8_t duk_unicode_caseconv_uc[1386] = { +144,3,128,3,0,184,7,192,6,192,112,35,242,199,224,64,74,192,49,32,128,162, +128,108,65,1,189,129,254,131,3,173,3,136,6,7,98,7,34,68,15,12,14,140,72,30, +104,28,112,32,67,0,65,4,0,138,0,128,4,1,88,65,76,83,9,252,9,248,6,28,131,4, +33,4,62,0,62,16,32,124,64,124,96,48,249,0,249,64,129,243,1,243,129,3,232,3, +233,1,135,216,7,218,4,15,184,15,221,2,31,114,31,200,8,62,236,63,180,8,125, +224,127,224,16,251,208,255,80,33,247,193,255,160,67,246,3,247,0,135,244,7, +246,1,15,240,15,244,2,33,112,33,96,32,73,160,73,108,104,176,192,176,1,121, +104,0,133,2,106,183,1,58,10,31,232,63,228,38,162,1,1,1,0,48,2,102,2,100,12, +4,232,4,228,64,10,88,10,81,112,23,160,23,144,96,48,96,48,64,128,104,64,104, +1,128,218,0,217,130,1,206,1,205,16,3,190,3,188,36,7,228,7,224,160,17,24,17, +16,144,36,112,36,96,160,110,32,110,0,128,246,64,246,6,2,48,130,48,17,4,139, +4,138,54,9,132,9,130,28,19,68,19,65,128,240,8,240,4,177,234,17,234,6,3,234, +35,235,33,11,26,11,25,193,150,64,150,64,50,44,236,44,235,5,76,131,76,128, +94,154,6,154,0,117,57,29,57,16,122,115,58,115,35,244,239,84,239,32,169,223, +233,223,130,211,200,211,200,2,167,151,167,150,21,79,107,79,104,8,112,26, +208,26,192,64,56,160,56,128,192,113,128,113,1,128,249,0,248,130,2,128,1, +166,4,7,240,7,238,8,177,204,177,200,16,96,49,0,48,224,128,110,64,110,1,1, +51,83,213,2,0,48,35,192,35,176,64,77,32,50,192,139,73,196,49,193,127,48,2, +212,14,112,3,252,5,224,4,196,1,36,5,252,1,76,6,0,9,12,6,72,6,68,6,84,7,216, +6,100,6,96,6,104,8,244,6,120,8,128,6,160,6,156,6,252,7,220,7,116,6,56,7, +204,7,196,9,64,177,188,9,68,177,180,9,72,177,192,9,76,6,4,9,80,6,24,9,100, +6,60,9,108,6,64,9,114,158,172,9,128,6,76,9,134,158,176,9,140,6,80,9,150, +158,52,9,160,6,92,9,172,177,136,9,178,158,180,9,196,177,184,9,200,6,116,9, +212,6,124,9,244,177,144,10,30,158,196,10,32,6,184,10,36,9,16,10,48,9,20,10, +72,6,220,10,118,158,200,10,122,158,192,13,20,14,100,13,220,13,216,14,176, +14,24,15,8,14,140,15,48,14,48,15,64,14,72,15,68,14,96,15,84,14,152,15,88, +14,128,15,92,15,60,15,192,14,104,15,196,14,132,15,200,15,228,15,204,13,252, +15,212,14,84,19,60,19,0,114,0,16,72,114,4,16,80,114,8,16,120,114,20,16,136, +114,24,16,168,114,28,17,136,114,34,153,40,117,230,157,244,117,244,177,140, +122,108,121,128,126,248,14,100,127,148,127,176,133,56,132,200,134,16,134, +12,177,132,177,128,177,148,8,232,177,152,8,248,179,204,179,202,158,50,158, +46,173,78,158,207,48,6,252,0,166,0,166,2,147,1,94,0,39,0,248,64,9,64,97, +128,114,24,28,200,24,64,24,8,29,134,7,74,6,16,6,2,11,15,2,154,130,169,15, +75,64,9,0,102,35,210,240,2,160,24,64,244,196,0,174,6,20,61,51,0,44,129,133, +15,77,64,8,32,87,195,234,16,29,40,24,152,250,150,7,74,6,38,6,0,62,169,129, +210,129,137,129,128,143,171,96,116,160,98,96,104,67,240,16,248,64,28,200, +252,12,62,18,7,50,63,5,15,133,1,204,143,193,195,225,96,115,35,240,144,248, +96,28,200,252,44,62,26,7,50,63,13,15,135,1,204,143,195,195,225,224,115,35, +241,16,248,64,28,200,252,76,62,18,7,50,63,21,15,133,1,204,143,197,195,225, +96,115,35,241,144,248,96,28,200,252,108,62,26,7,50,63,29,15,135,1,204,143, +199,195,225,224,115,35,242,16,249,64,28,200,252,140,62,82,7,50,63,37,15, +149,1,204,143,201,195,229,96,115,35,242,144,249,96,28,200,252,172,62,90,7, +50,63,45,15,151,1,204,143,203,195,229,224,115,35,243,16,249,64,28,200,252, +204,62,82,7,50,63,53,15,149,1,204,143,205,195,229,96,115,35,243,144,249,96, +28,200,252,236,62,90,7,50,63,61,15,151,1,204,143,207,195,229,224,115,35, +244,16,251,64,28,200,253,12,62,210,7,50,63,69,15,181,1,204,143,209,195,237, +96,115,35,244,144,251,96,28,200,253,44,62,218,7,50,63,77,15,183,1,204,143, +211,195,237,224,115,35,245,16,251,64,28,200,253,76,62,210,7,50,63,85,15, +181,1,204,143,213,195,237,96,115,35,245,144,251,96,28,200,253,108,62,218,7, +50,63,93,15,183,1,204,143,215,195,237,224,115,35,246,80,253,208,28,200,253, +156,7,34,7,50,63,105,1,195,1,204,143,219,64,114,32,104,67,246,248,28,136, +26,16,28,200,253,228,7,34,7,50,63,133,15,229,1,204,143,225,192,114,224,115, +35,248,144,28,72,28,200,254,52,7,46,6,132,63,143,129,203,129,161,1,204,143, +230,64,114,224,115,35,250,88,28,200,24,64,24,0,254,158,7,50,6,16,6,2,63, +173,1,204,129,161,15,235,224,115,32,97,0,104,67,252,88,29,40,24,64,24,0, +255,30,7,74,6,16,6,2,63,201,1,208,129,137,143,243,64,116,160,104,67,252, +248,29,40,24,64,26,16,255,148,63,244,7,50,63,231,1,212,129,204,143,250,64, +113,224,115,35,254,208,29,72,26,16,255,190,7,82,6,132,7,50,63,249,1,212, +129,204,253,128,64,8,192,8,223,96,48,2,48,2,79,216,20,0,140,0,153,246,7, +128,35,0,35,0,36,253,130,96,8,192,8,192,9,159,96,176,2,152,2,167,216,52,0, +166,0,169,246,39,2,162,2,163,125,138,64,168,128,166,191,98,176,42,32,41, +223,216,180,10,156,10,141,246,47,2,162,2,158,128, +}; +const duk_uint8_t duk_unicode_caseconv_lc[680] = { +152,3,0,3,128,184,6,192,7,192,112,24,144,37,96,64,54,32,81,64,128,226,0, +235,65,129,199,1,230,130,3,145,3,177,34,7,70,7,134,36,15,244,13,236,24,32, +0,34,129,0,65,0,67,4,0,166,32,172,41,132,40,11,64,19,9,208,85,184,80,19, +240,19,248,12,62,16,62,0,32,124,96,124,64,48,249,64,249,0,129,243,129,243, +1,3,233,3,232,1,135,218,7,216,4,15,196,15,192,8,31,152,31,144,16,63,80,63, +64,32,126,224,126,192,16,253,208,251,128,33,252,129,247,32,131,251,3,250,0, +135,246,135,221,129,15,244,15,240,2,31,234,31,122,4,63,240,62,240,8,127, +232,125,240,17,11,1,11,129,2,75,98,77,3,69,128,5,134,11,203,31,128,143,193, +127,144,255,160,154,140,4,0,4,4,192,9,144,9,152,48,19,144,19,161,0,41,64, +41,101,192,94,64,94,129,128,193,0,193,130,1,160,1,161,6,3,102,3,104,8,7,44, +7,48,72,14,240,14,248,144,31,32,31,48,64,63,0,63,37,0,136,128,136,196,129, +35,1,35,133,3,112,3,113,4,7,176,7,178,48,17,128,17,132,136,36,80,36,89,176, +76,16,76,32,224,154,0,154,44,7,128,7,128,101,143,80,15,80,176,31,89,31,81, +8,88,206,88,208,12,178,0,178,5,145,103,89,103,96,42,100,10,100,18,244,208, +20,208,35,169,200,169,200,195,211,153,83,153,159,167,121,167,122,5,78,253, +78,254,22,158,66,158,68,21,60,181,60,184,170,123,74,123,80,67,0,211,1,64,2, +1,172,1,173,4,3,136,3,140,12,7,20,7,24,16,31,184,31,192,34,199,34,199,48, +65,128,195,128,196,2,1,184,1,185,5,79,84,4,204,8,0,192,101,128,154,65,1,29, +129,30,2,16,199,45,39,5,251,240,23,128,15,240,24,16,37,48,24,96,37,64,24, +224,29,208,24,240,37,144,25,0,37,176,25,16,25,32,25,48,38,0,25,64,38,48,25, +112,38,128,25,128,25,144,25,208,39,32,25,240,39,80,26,112,26,128,26,224,40, +128,27,112,41,32,31,16,31,48,31,96,25,80,31,112,27,240,34,0,25,224,35,162, +198,80,35,208,25,160,35,226,198,96,36,48,24,0,36,64,40,144,36,80,40,192,55, +96,55,112,55,240,63,48,56,96,58,192,56,192,60,192,60,240,61,112,63,64,59, +128,63,144,63,32,76,0,76,241,233,224,13,241,251,193,251,49,252,193,252,49, +254,193,254,81,255,193,255,50,18,96,60,146,18,160,6,178,18,176,14,82,19,34, +20,226,24,50,24,66,198,2,198,18,198,32,38,178,198,49,215,210,198,64,39,210, +198,208,37,18,198,224,39,18,198,240,37,2,199,0,37,34,207,34,207,58,119,209, +215,154,120,186,120,202,120,208,38,90,122,176,37,202,122,192,38,26,122,208, +38,202,123,0,41,234,123,16,40,122,123,32,41,218,123,58,181,48,32,38,16,3, +72,24,56, +}; + +#if defined(DUK_USE_REGEXP_CANON_WORKAROUND) +/* + * Automatically generated by extract_caseconv.py, do not edit! + */ + +const duk_uint16_t duk_unicode_re_canon_lookup[65536] = { +0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27, +28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52, 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+65418L,65419L,65420L,65421L,65422L,65423L,65424L,65425L,65426L,65427L, +65428L,65429L,65430L,65431L,65432L,65433L,65434L,65435L,65436L,65437L, +65438L,65439L,65440L,65441L,65442L,65443L,65444L,65445L,65446L,65447L, +65448L,65449L,65450L,65451L,65452L,65453L,65454L,65455L,65456L,65457L, +65458L,65459L,65460L,65461L,65462L,65463L,65464L,65465L,65466L,65467L, +65468L,65469L,65470L,65471L,65472L,65473L,65474L,65475L,65476L,65477L, +65478L,65479L,65480L,65481L,65482L,65483L,65484L,65485L,65486L,65487L, +65488L,65489L,65490L,65491L,65492L,65493L,65494L,65495L,65496L,65497L, +65498L,65499L,65500L,65501L,65502L,65503L,65504L,65505L,65506L,65507L, +65508L,65509L,65510L,65511L,65512L,65513L,65514L,65515L,65516L,65517L, +65518L,65519L,65520L,65521L,65522L,65523L,65524L,65525L,65526L,65527L, +65528L,65529L,65530L,65531L,65532L,65533L,65534L,65535L, +}; +#endif + +#if defined(DUK_USE_REGEXP_CANON_BITMAP) +/* + * Automatically generated by extract_caseconv.py, do not edit! + */ + +const duk_uint8_t duk_unicode_re_canon_bitmap[256] = { +23,0,224,19,1,228,255,255,255,255,255,255,255,255,255,255,255,255,255,127, +255,255,255,255,255,255,255,255,231,247,0,16,255,227,255,255,63,255,255, +255,255,255,255,255,1,252,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +227,193,255,255,255,147,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, +255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,251, +}; +#endif +#line 1 "duk_util_bitdecoder.c" +/* + * Bitstream decoder. + */ + +/* #include duk_internal.h -> already included */ + +/* Decode 'bits' bits from the input stream (bits must be 1...24). + * When reading past bitstream end, zeroes are shifted in. The result + * is signed to match duk_bd_decode_flagged. + */ +DUK_INTERNAL duk_uint32_t duk_bd_decode(duk_bitdecoder_ctx *ctx, duk_small_int_t bits) { + duk_small_int_t shift; + duk_uint32_t mask; + duk_uint32_t tmp; + + /* Note: cannot read more than 24 bits without possibly shifting top bits out. + * Fixable, but adds complexity. + */ + DUK_ASSERT(bits >= 1 && bits <= 24); + + while (ctx->currbits < bits) { +#if 0 + DUK_DDD(DUK_DDDPRINT("decode_bits: shift more data (bits=%ld, currbits=%ld)", + (long) bits, (long) ctx->currbits)); +#endif + ctx->currval <<= 8; + if (ctx->offset < ctx->length) { + /* If ctx->offset >= ctx->length, we "shift zeroes in" + * instead of croaking. + */ + ctx->currval |= ctx->data[ctx->offset++]; + } + ctx->currbits += 8; + } +#if 0 + DUK_DDD(DUK_DDDPRINT("decode_bits: bits=%ld, currbits=%ld, currval=0x%08lx", + (long) bits, (long) ctx->currbits, (unsigned long) ctx->currval)); +#endif + + /* Extract 'top' bits of currval; note that the extracted bits do not need + * to be cleared, we just ignore them on next round. + */ + shift = ctx->currbits - bits; + mask = (((duk_uint32_t) 1U) << bits) - 1U; + tmp = (ctx->currval >> shift) & mask; + ctx->currbits = shift; /* remaining */ + +#if 0 + DUK_DDD(DUK_DDDPRINT("decode_bits: %ld bits -> 0x%08lx (%ld), currbits=%ld, currval=0x%08lx", + (long) bits, (unsigned long) tmp, (long) tmp, (long) ctx->currbits, (unsigned long) ctx->currval)); +#endif + + return tmp; +} + +DUK_INTERNAL duk_small_uint_t duk_bd_decode_flag(duk_bitdecoder_ctx *ctx) { + return (duk_small_uint_t) duk_bd_decode(ctx, 1); +} + +/* Decode a one-bit flag, and if set, decode a value of 'bits', otherwise return + * default value. + */ +DUK_INTERNAL duk_uint32_t duk_bd_decode_flagged(duk_bitdecoder_ctx *ctx, duk_small_int_t bits, duk_uint32_t def_value) { + if (duk_bd_decode_flag(ctx)) { + return duk_bd_decode(ctx, bits); + } else { + return def_value; + } +} + +/* Signed variant, allows negative marker value. */ +DUK_INTERNAL duk_int32_t duk_bd_decode_flagged_signed(duk_bitdecoder_ctx *ctx, duk_small_int_t bits, duk_int32_t def_value) { + return (duk_int32_t) duk_bd_decode_flagged(ctx, bits, (duk_uint32_t) def_value); +} + +/* Shared varint encoding. Match dukutil.py BitEncode.varuint(). */ +DUK_INTERNAL duk_uint32_t duk_bd_decode_varuint(duk_bitdecoder_ctx *ctx) { + duk_small_uint_t t; + + /* The bit encoding choices here are based on manual testing against + * the actual varuints generated by genbuiltins.py. + */ + switch (duk_bd_decode(ctx, 2)) { + case 0: + return 0; /* [0,0] */ + case 1: + return duk_bd_decode(ctx, 2) + 1; /* [1,4] */ + case 2: + return duk_bd_decode(ctx, 5) + 5; /* [5,36] */ + default: + t = duk_bd_decode(ctx, 7); + if (t == 0) { + return duk_bd_decode(ctx, 20); + } + return (t - 1) + 37; /* [37,163] */ + } +} + +/* Decode a bit packed string from a custom format used by genbuiltins.py. + * This function is here because it's used for both heap and thread inits. + * Caller must supply the output buffer whose size is NOT checked! + */ + +#define DUK__BITPACK_LETTER_LIMIT 26 +#define DUK__BITPACK_LOOKUP1 26 +#define DUK__BITPACK_LOOKUP2 27 +#define DUK__BITPACK_SWITCH1 28 +#define DUK__BITPACK_SWITCH 29 +#define DUK__BITPACK_UNUSED1 30 +#define DUK__BITPACK_EIGHTBIT 31 + +DUK_LOCAL const duk_uint8_t duk__bitpacked_lookup[16] = { + DUK_ASC_0, DUK_ASC_1, DUK_ASC_2, DUK_ASC_3, + DUK_ASC_4, DUK_ASC_5, DUK_ASC_6, DUK_ASC_7, + DUK_ASC_8, DUK_ASC_9, DUK_ASC_UNDERSCORE, DUK_ASC_SPACE, + 0x82, 0x80, DUK_ASC_DOUBLEQUOTE, DUK_ASC_LCURLY +}; + +DUK_INTERNAL duk_small_uint_t duk_bd_decode_bitpacked_string(duk_bitdecoder_ctx *bd, duk_uint8_t *out) { + duk_small_uint_t len; + duk_small_uint_t mode; + duk_small_uint_t t; + duk_small_uint_t i; + + len = duk_bd_decode(bd, 5); + if (len == 31) { + len = duk_bd_decode(bd, 8); /* Support up to 256 bytes; rare. */ + } + + mode = 32; /* 0 = uppercase, 32 = lowercase (= 'a' - 'A') */ + for (i = 0; i < len; i++) { + t = duk_bd_decode(bd, 5); + if (t < DUK__BITPACK_LETTER_LIMIT) { + t = t + DUK_ASC_UC_A + mode; + } else if (t == DUK__BITPACK_LOOKUP1) { + t = duk__bitpacked_lookup[duk_bd_decode(bd, 3)]; + } else if (t == DUK__BITPACK_LOOKUP2) { + t = duk__bitpacked_lookup[8 + duk_bd_decode(bd, 3)]; + } else if (t == DUK__BITPACK_SWITCH1) { + t = duk_bd_decode(bd, 5); + DUK_ASSERT_DISABLE(t >= 0); /* unsigned */ + DUK_ASSERT(t <= 25); + t = t + DUK_ASC_UC_A + (mode ^ 32); + } else if (t == DUK__BITPACK_SWITCH) { + mode = mode ^ 32; + t = duk_bd_decode(bd, 5); + DUK_ASSERT_DISABLE(t >= 0); + DUK_ASSERT(t <= 25); + t = t + DUK_ASC_UC_A + mode; + } else if (t == DUK__BITPACK_EIGHTBIT) { + t = duk_bd_decode(bd, 8); + } + out[i] = (duk_uint8_t) t; + } + + return len; +} + +/* automatic undefs */ +#undef DUK__BITPACK_EIGHTBIT +#undef DUK__BITPACK_LETTER_LIMIT +#undef DUK__BITPACK_LOOKUP1 +#undef DUK__BITPACK_LOOKUP2 +#undef DUK__BITPACK_SWITCH +#undef DUK__BITPACK_SWITCH1 +#undef DUK__BITPACK_UNUSED1 +#line 1 "duk_util_bitencoder.c" +/* + * Bitstream encoder. + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL void duk_be_encode(duk_bitencoder_ctx *ctx, duk_uint32_t data, duk_small_int_t bits) { + duk_uint8_t tmp; + + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(ctx->currbits < 8); + + /* This limitation would be fixable but adds unnecessary complexity. */ + DUK_ASSERT(bits >= 1 && bits <= 24); + + ctx->currval = (ctx->currval << bits) | data; + ctx->currbits += bits; + + while (ctx->currbits >= 8) { + if (ctx->offset < ctx->length) { + tmp = (duk_uint8_t) ((ctx->currval >> (ctx->currbits - 8)) & 0xff); + ctx->data[ctx->offset++] = tmp; + } else { + /* If buffer has been exhausted, truncate bitstream */ + ctx->truncated = 1; + } + + ctx->currbits -= 8; + } +} + +DUK_INTERNAL void duk_be_finish(duk_bitencoder_ctx *ctx) { + duk_small_int_t npad; + + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(ctx->currbits < 8); + + npad = (duk_small_int_t) (8 - ctx->currbits); + if (npad > 0) { + duk_be_encode(ctx, 0, npad); + } + DUK_ASSERT(ctx->currbits == 0); +} +#line 1 "duk_util_bufwriter.c" +/* + * Fast buffer writer with slack management. + */ + +/* #include duk_internal.h -> already included */ + +/* XXX: Avoid duk_{memcmp,memmove}_unsafe() by imposing a minimum length of + * >0 for the underlying dynamic buffer. + */ + +/* + * Macro support functions (use only macros in calling code) + */ + +DUK_LOCAL void duk__bw_update_ptrs(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_size_t curr_offset, duk_size_t new_length) { + duk_uint8_t *p; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw_ctx != NULL); + DUK_UNREF(thr); + + /* 'p' might be NULL when the underlying buffer is zero size. If so, + * the resulting pointers are not used unsafely. + */ + p = (duk_uint8_t *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, bw_ctx->buf); + DUK_ASSERT(p != NULL || (DUK_HBUFFER_DYNAMIC_GET_SIZE(bw_ctx->buf) == 0 && curr_offset == 0 && new_length == 0)); + bw_ctx->p = p + curr_offset; + bw_ctx->p_base = p; + bw_ctx->p_limit = p + new_length; +} + +DUK_INTERNAL void duk_bw_init(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_hbuffer_dynamic *h_buf) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw_ctx != NULL); + DUK_ASSERT(h_buf != NULL); + + bw_ctx->buf = h_buf; + duk__bw_update_ptrs(thr, bw_ctx, 0, DUK_HBUFFER_DYNAMIC_GET_SIZE(h_buf)); +} + +DUK_INTERNAL void duk_bw_init_pushbuf(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_size_t buf_size) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw_ctx != NULL); + + (void) duk_push_dynamic_buffer(thr, buf_size); + bw_ctx->buf = (duk_hbuffer_dynamic *) duk_known_hbuffer(thr, -1); + DUK_ASSERT(bw_ctx->buf != NULL); + duk__bw_update_ptrs(thr, bw_ctx, 0, buf_size); +} + +/* Resize target buffer for requested size. Called by the macro only when the + * fast path test (= there is space) fails. + */ +DUK_INTERNAL duk_uint8_t *duk_bw_resize(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx, duk_size_t sz) { + duk_size_t curr_off; + duk_size_t add_sz; + duk_size_t new_sz; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw_ctx != NULL); + + /* We could do this operation without caller updating bw_ctx->ptr, + * but by writing it back here we can share code better. + */ + + curr_off = (duk_size_t) (bw_ctx->p - bw_ctx->p_base); + add_sz = (curr_off >> DUK_BW_SLACK_SHIFT) + DUK_BW_SLACK_ADD; + new_sz = curr_off + sz + add_sz; + if (DUK_UNLIKELY(new_sz < curr_off)) { + /* overflow */ + DUK_ERROR_RANGE(thr, DUK_STR_BUFFER_TOO_LONG); + DUK_WO_NORETURN(return NULL;); + } +#if 0 /* for manual torture testing: tight allocation, useful with valgrind */ + new_sz = curr_off + sz; +#endif + + /* This is important to ensure dynamic buffer data pointer is not + * NULL (which is possible if buffer size is zero), which in turn + * causes portability issues with e.g. memmove() and memcpy(). + */ + DUK_ASSERT(new_sz >= 1); + + DUK_DD(DUK_DDPRINT("resize bufferwriter from %ld to %ld (add_sz=%ld)", (long) curr_off, (long) new_sz, (long) add_sz)); + + duk_hbuffer_resize(thr, bw_ctx->buf, new_sz); + duk__bw_update_ptrs(thr, bw_ctx, curr_off, new_sz); + return bw_ctx->p; +} + +/* Make buffer compact, matching current written size. */ +DUK_INTERNAL void duk_bw_compact(duk_hthread *thr, duk_bufwriter_ctx *bw_ctx) { + duk_size_t len; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw_ctx != NULL); + DUK_UNREF(thr); + + len = (duk_size_t) (bw_ctx->p - bw_ctx->p_base); + duk_hbuffer_resize(thr, bw_ctx->buf, len); + duk__bw_update_ptrs(thr, bw_ctx, len, len); +} + +DUK_INTERNAL void duk_bw_write_raw_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t src_off, duk_size_t len) { + duk_uint8_t *p_base; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(src_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(src_off + len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_UNREF(thr); + + p_base = bw->p_base; + duk_memcpy_unsafe((void *) bw->p, + (const void *) (p_base + src_off), + (size_t) len); + bw->p += len; +} + +DUK_INTERNAL void duk_bw_write_ensure_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t src_off, duk_size_t len) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(src_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(src_off + len <= DUK_BW_GET_SIZE(thr, bw)); + + DUK_BW_ENSURE(thr, bw, len); + duk_bw_write_raw_slice(thr, bw, src_off, len); +} + +DUK_INTERNAL void duk_bw_insert_raw_bytes(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, const duk_uint8_t *buf, duk_size_t len) { + duk_uint8_t *p_base; + duk_size_t buf_sz, move_sz; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(dst_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(buf != NULL); + DUK_UNREF(thr); + + p_base = bw->p_base; + buf_sz = (duk_size_t) (bw->p - p_base); /* constrained by maximum buffer size */ + move_sz = buf_sz - dst_off; + + DUK_ASSERT(p_base != NULL); /* buffer size is >= 1 */ + duk_memmove_unsafe((void *) (p_base + dst_off + len), + (const void *) (p_base + dst_off), + (size_t) move_sz); + duk_memcpy_unsafe((void *) (p_base + dst_off), + (const void *) buf, + (size_t) len); + bw->p += len; +} + +DUK_INTERNAL void duk_bw_insert_ensure_bytes(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, const duk_uint8_t *buf, duk_size_t len) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(dst_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(buf != NULL); + + DUK_BW_ENSURE(thr, bw, len); + duk_bw_insert_raw_bytes(thr, bw, dst_off, buf, len); +} + +DUK_INTERNAL void duk_bw_insert_raw_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, duk_size_t src_off, duk_size_t len) { + duk_uint8_t *p_base; + duk_size_t buf_sz, move_sz; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(dst_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(src_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(src_off + len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_UNREF(thr); + + p_base = bw->p_base; + + /* Don't support "straddled" source now. */ + DUK_ASSERT(dst_off <= src_off || dst_off >= src_off + len); + + if (dst_off <= src_off) { + /* Target is before source. Source offset is expressed as + * a "before change" offset. Account for the memmove. + */ + src_off += len; + } + + buf_sz = (duk_size_t) (bw->p - p_base); + move_sz = buf_sz - dst_off; + + DUK_ASSERT(p_base != NULL); /* buffer size is >= 1 */ + duk_memmove_unsafe((void *) (p_base + dst_off + len), + (const void *) (p_base + dst_off), + (size_t) move_sz); + duk_memcpy_unsafe((void *) (p_base + dst_off), + (const void *) (p_base + src_off), + (size_t) len); + bw->p += len; +} + +DUK_INTERNAL void duk_bw_insert_ensure_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t dst_off, duk_size_t src_off, duk_size_t len) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(dst_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(src_off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(src_off + len <= DUK_BW_GET_SIZE(thr, bw)); + + /* Don't support "straddled" source now. */ + DUK_ASSERT(dst_off <= src_off || dst_off >= src_off + len); + + DUK_BW_ENSURE(thr, bw, len); + duk_bw_insert_raw_slice(thr, bw, dst_off, src_off, len); +} + +DUK_INTERNAL duk_uint8_t *duk_bw_insert_raw_area(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t off, duk_size_t len) { + duk_uint8_t *p_base, *p_dst, *p_src; + duk_size_t buf_sz, move_sz; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_UNREF(thr); + + p_base = bw->p_base; + buf_sz = (duk_size_t) (bw->p - p_base); + move_sz = buf_sz - off; + p_dst = p_base + off + len; + p_src = p_base + off; + duk_memmove_unsafe((void *) p_dst, (const void *) p_src, (size_t) move_sz); + return p_src; /* point to start of 'reserved area' */ +} + +DUK_INTERNAL duk_uint8_t *duk_bw_insert_ensure_area(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t off, duk_size_t len) { + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(off <= DUK_BW_GET_SIZE(thr, bw)); + + DUK_BW_ENSURE(thr, bw, len); + return duk_bw_insert_raw_area(thr, bw, off, len); +} + +DUK_INTERNAL void duk_bw_remove_raw_slice(duk_hthread *thr, duk_bufwriter_ctx *bw, duk_size_t off, duk_size_t len) { + duk_size_t move_sz; + + duk_uint8_t *p_base; + duk_uint8_t *p_src; + duk_uint8_t *p_dst; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(bw != NULL); + DUK_ASSERT(off <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_ASSERT(off + len <= DUK_BW_GET_SIZE(thr, bw)); + DUK_UNREF(thr); + + p_base = bw->p_base; + p_dst = p_base + off; + p_src = p_dst + len; + move_sz = (duk_size_t) (bw->p - p_src); + duk_memmove_unsafe((void *) p_dst, + (const void *) p_src, + (size_t) move_sz); + bw->p -= len; +} + +/* + * Macro support functions for reading/writing raw data. + * + * These are done using mempcy to ensure they're valid even for unaligned + * reads/writes on platforms where alignment counts. On x86 at least gcc + * is able to compile these into a bswap+mov. "Always inline" is used to + * ensure these macros compile to minimal code. + * + * Not really bufwriter related, but currently used together. + */ + +DUK_INTERNAL DUK_ALWAYS_INLINE duk_uint16_t duk_raw_read_u16_be(duk_uint8_t **p) { + union { + duk_uint8_t b[2]; + duk_uint16_t x; + } u; + + duk_memcpy((void *) u.b, (const void *) (*p), (size_t) 2); + u.x = DUK_NTOH16(u.x); + *p += 2; + return u.x; +} + +DUK_INTERNAL DUK_ALWAYS_INLINE duk_uint32_t duk_raw_read_u32_be(duk_uint8_t **p) { + union { + duk_uint8_t b[4]; + duk_uint32_t x; + } u; + + duk_memcpy((void *) u.b, (const void *) (*p), (size_t) 4); + u.x = DUK_NTOH32(u.x); + *p += 4; + return u.x; +} + +DUK_INTERNAL DUK_ALWAYS_INLINE duk_double_t duk_raw_read_double_be(duk_uint8_t **p) { + duk_double_union du; + union { + duk_uint8_t b[4]; + duk_uint32_t x; + } u; + + duk_memcpy((void *) u.b, (const void *) (*p), (size_t) 4); + u.x = DUK_NTOH32(u.x); + du.ui[DUK_DBL_IDX_UI0] = u.x; + duk_memcpy((void *) u.b, (const void *) (*p + 4), (size_t) 4); + u.x = DUK_NTOH32(u.x); + du.ui[DUK_DBL_IDX_UI1] = u.x; + *p += 8; + + return du.d; +} + +DUK_INTERNAL DUK_ALWAYS_INLINE void duk_raw_write_u16_be(duk_uint8_t **p, duk_uint16_t val) { + union { + duk_uint8_t b[2]; + duk_uint16_t x; + } u; + + u.x = DUK_HTON16(val); + duk_memcpy((void *) (*p), (const void *) u.b, (size_t) 2); + *p += 2; +} + +DUK_INTERNAL DUK_ALWAYS_INLINE void duk_raw_write_u32_be(duk_uint8_t **p, duk_uint32_t val) { + union { + duk_uint8_t b[4]; + duk_uint32_t x; + } u; + + u.x = DUK_HTON32(val); + duk_memcpy((void *) (*p), (const void *) u.b, (size_t) 4); + *p += 4; +} + +DUK_INTERNAL DUK_ALWAYS_INLINE void duk_raw_write_double_be(duk_uint8_t **p, duk_double_t val) { + duk_double_union du; + union { + duk_uint8_t b[4]; + duk_uint32_t x; + } u; + + du.d = val; + u.x = du.ui[DUK_DBL_IDX_UI0]; + u.x = DUK_HTON32(u.x); + duk_memcpy((void *) (*p), (const void *) u.b, (size_t) 4); + u.x = du.ui[DUK_DBL_IDX_UI1]; + u.x = DUK_HTON32(u.x); + duk_memcpy((void *) (*p + 4), (const void *) u.b, (size_t) 4); + *p += 8; +} +#line 1 "duk_util_cast.c" +/* + * Cast helpers. + * + * C99+ coercion is challenging portability-wise because out-of-range casts + * may invoke implementation defined or even undefined behavior. See e.g. + * http://blog.frama-c.com/index.php?post/2013/10/09/Overflow-float-integer. + * + * Provide explicit cast helpers which try to avoid implementation defined + * or undefined behavior. These helpers can then be simplified in the vast + * majority of cases where the implementation defined or undefined behavior + * is not problematic. + */ + +/* #include duk_internal.h -> already included */ + +/* Portable double-to-integer cast which avoids undefined behavior and avoids + * relying on fmin(), fmax(), or other intrinsics. Out-of-range results are + * not assumed by caller, but here value is clamped, NaN converts to minval. + */ +#define DUK__DOUBLE_INT_CAST1(tname,minval,maxval) do { \ + if (DUK_LIKELY(x >= (duk_double_t) (minval))) { \ + DUK_ASSERT(!DUK_ISNAN(x)); \ + if (DUK_LIKELY(x <= (duk_double_t) (maxval))) { \ + return (tname) x; \ + } else { \ + return (tname) (maxval); \ + } \ + } else { \ + /* NaN or below minval. Since we don't care about the result \ + * for out-of-range values, just return the minimum value for \ + * both. \ + */ \ + return (tname) (minval); \ + } \ + } while (0) + +/* Rely on specific NaN behavior for duk_double_{fmin,fmax}(): if either + * argument is a NaN, return the second argument. This avoids a + * NaN-to-integer cast which is undefined behavior. + */ +#define DUK__DOUBLE_INT_CAST2(tname,minval,maxval) do { \ + return (tname) duk_double_fmin(duk_double_fmax(x, (duk_double_t) (minval)), (duk_double_t) (maxval)); \ + } while (0) + +/* Another solution which doesn't need C99+ behavior for fmin() and fmax(). */ +#define DUK__DOUBLE_INT_CAST3(tname,minval,maxval) do { \ + if (DUK_ISNAN(x)) { \ + /* 0 or any other value is fine. */ \ + return (tname) 0; \ + } else \ + return (tname) DUK_FMIN(DUK_FMAX(x, (duk_double_t) (minval)), (duk_double_t) (maxval)); \ + } \ + } while (0) + +/* C99+ solution: relies on specific fmin() and fmax() behavior in C99: if + * one argument is NaN but the other isn't, the non-NaN argument is returned. + * Because the limits are non-NaN values, explicit NaN check is not needed. + * This may not work on all legacy platforms, and also doesn't seem to inline + * the fmin() and fmax() calls (unless one uses -ffast-math which we don't + * support). + */ +#define DUK__DOUBLE_INT_CAST4(tname,minval,maxval) do { \ + return (tname) DUK_FMIN(DUK_FMAX(x, (duk_double_t) (minval)), (duk_double_t) (maxval)); \ + } while (0) + +DUK_INTERNAL duk_int_t duk_double_to_int_t(duk_double_t x) { +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) + /* Real world solution: almost any practical platform will provide + * an integer value without any guarantees what it is (which is fine). + */ + return (duk_int_t) x; +#else + DUK__DOUBLE_INT_CAST1(duk_int_t, DUK_INT_MIN, DUK_INT_MAX); +#endif +} + +DUK_INTERNAL duk_uint_t duk_double_to_uint_t(duk_double_t x) { +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) + return (duk_uint_t) x; +#else + DUK__DOUBLE_INT_CAST1(duk_uint_t, DUK_UINT_MIN, DUK_UINT_MAX); +#endif +} + +DUK_INTERNAL duk_int32_t duk_double_to_int32_t(duk_double_t x) { +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) + return (duk_int32_t) x; +#else + DUK__DOUBLE_INT_CAST1(duk_int32_t, DUK_INT32_MIN, DUK_INT32_MAX); +#endif +} + +DUK_INTERNAL duk_uint32_t duk_double_to_uint32_t(duk_double_t x) { +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) + return (duk_uint32_t) x; +#else + DUK__DOUBLE_INT_CAST1(duk_uint32_t, DUK_UINT32_MIN, DUK_UINT32_MAX); +#endif +} + +/* Largest IEEE double that doesn't round to infinity in the default rounding + * mode. The exact midpoint between (1 - 2^(-24)) * 2^128 and 2^128 rounds to + * infinity, at least on x64. This number is one double unit below that + * midpoint. See misc/float_cast.c. + */ +#define DUK__FLOAT_ROUND_LIMIT 340282356779733623858607532500980858880.0 + +/* Maximum IEEE float. Double-to-float conversion above this would be out of + * range and thus technically undefined behavior. + */ +#define DUK__FLOAT_MAX 340282346638528859811704183484516925440.0 + +DUK_INTERNAL duk_float_t duk_double_to_float_t(duk_double_t x) { + /* Even a double-to-float cast is technically undefined behavior if + * the double is out-of-range. C99 Section 6.3.1.5: + * + * If the value being converted is in the range of values that can + * be represented but cannot be represented exactly, the result is + * either the nearest higher or nearest lower representable value, + * chosen in an implementation-defined manner. If the value being + * converted is outside the range of values that can be represented, + * the behavior is undefined. + */ +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) + return (duk_float_t) x; +#else + duk_double_t t; + + t = DUK_FABS(x); + DUK_ASSERT((DUK_ISNAN(x) && DUK_ISNAN(t)) || + (!DUK_ISNAN(x) && !DUK_ISNAN(t))); + + if (DUK_LIKELY(t <= DUK__FLOAT_MAX)) { + /* Standard in-range case, try to get here with a minimum + * number of checks and branches. + */ + DUK_ASSERT(!DUK_ISNAN(x)); + return (duk_float_t) x; + } else if (t <= DUK__FLOAT_ROUND_LIMIT) { + /* Out-of-range, but rounds to min/max float. */ + DUK_ASSERT(!DUK_ISNAN(x)); + if (x < 0.0) { + return (duk_float_t) -DUK__FLOAT_MAX; + } else { + return (duk_float_t) DUK__FLOAT_MAX; + } + } else if (DUK_ISNAN(x)) { + /* Assumes double NaN -> float NaN considered "in range". */ + DUK_ASSERT(DUK_ISNAN(x)); + return (duk_float_t) x; + } else { + /* Out-of-range, rounds to +/- Infinity. */ + if (x < 0.0) { + return (duk_float_t) -DUK_DOUBLE_INFINITY; + } else { + return (duk_float_t) DUK_DOUBLE_INFINITY; + } + } +#endif +} + +/* automatic undefs */ +#undef DUK__DOUBLE_INT_CAST1 +#undef DUK__DOUBLE_INT_CAST2 +#undef DUK__DOUBLE_INT_CAST3 +#undef DUK__DOUBLE_INT_CAST4 +#undef DUK__FLOAT_MAX +#undef DUK__FLOAT_ROUND_LIMIT +#line 1 "duk_util_double.c" +/* + * IEEE double helpers. + */ + +/* #include duk_internal.h -> already included */ + +DUK_INTERNAL duk_bool_t duk_double_is_anyinf(duk_double_t x) { + duk_double_union du; + du.d = x; + return DUK_DBLUNION_IS_ANYINF(&du); +} + +DUK_INTERNAL duk_bool_t duk_double_is_posinf(duk_double_t x) { + duk_double_union du; + du.d = x; + return DUK_DBLUNION_IS_POSINF(&du); +} + +DUK_INTERNAL duk_bool_t duk_double_is_neginf(duk_double_t x) { + duk_double_union du; + du.d = x; + return DUK_DBLUNION_IS_NEGINF(&du); +} + +DUK_INTERNAL duk_bool_t duk_double_is_nan(duk_double_t x) { + duk_double_union du; + du.d = x; + /* Assumes we're dealing with a Duktape internal NaN which is + * NaN normalized if duk_tval requires it. + */ + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + return DUK_DBLUNION_IS_NAN(&du); +} + +DUK_INTERNAL duk_bool_t duk_double_is_nan_or_zero(duk_double_t x) { + duk_double_union du; + du.d = x; + /* Assumes we're dealing with a Duktape internal NaN which is + * NaN normalized if duk_tval requires it. + */ + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + return DUK_DBLUNION_IS_NAN(&du) || DUK_DBLUNION_IS_ANYZERO(&du); +} + +DUK_INTERNAL duk_bool_t duk_double_is_nan_or_inf(duk_double_t x) { + duk_double_union du; + du.d = x; + /* If exponent is 0x7FF the argument is either a NaN or an + * infinity. We don't need to check any other fields. + */ +#if defined(DUK_USE_64BIT_OPS) +#if defined(DUK_USE_DOUBLE_ME) + return (du.ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x000000007ff00000)) == DUK_U64_CONSTANT(0x000000007ff00000); +#else + return (du.ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x7ff0000000000000)) == DUK_U64_CONSTANT(0x7ff0000000000000); +#endif +#else + return (du.ui[DUK_DBL_IDX_UI0] & 0x7ff00000UL) == 0x7ff00000UL; +#endif +} + +DUK_INTERNAL duk_bool_t duk_double_is_nan_zero_inf(duk_double_t x) { + duk_double_union du; +#if defined(DUK_USE_64BIT_OPS) + duk_uint64_t t; +#else + duk_uint32_t t; +#endif + du.d = x; +#if defined(DUK_USE_64BIT_OPS) +#if defined(DUK_USE_DOUBLE_ME) + t = du.ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x000000007ff00000); + if (t == DUK_U64_CONSTANT(0x0000000000000000)) { + t = du.ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x0000000080000000); + return t == 0; + } + if (t == DUK_U64_CONSTANT(0x000000007ff00000)) { + return 1; + } +#else + t = du.ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x7ff0000000000000); + if (t == DUK_U64_CONSTANT(0x0000000000000000)) { + t = du.ull[DUK_DBL_IDX_ULL0] & DUK_U64_CONSTANT(0x8000000000000000); + return t == 0; + } + if (t == DUK_U64_CONSTANT(0x7ff0000000000000)) { + return 1; + } +#endif +#else + t = du.ui[DUK_DBL_IDX_UI0] & 0x7ff00000UL; + if (t == 0x00000000UL) { + return DUK_DBLUNION_IS_ANYZERO(&du); + } + if (t == 0x7ff00000UL) { + return 1; + } +#endif + return 0; +} + +DUK_INTERNAL duk_small_uint_t duk_double_signbit(duk_double_t x) { + duk_double_union du; + du.d = x; + return (duk_small_uint_t) DUK_DBLUNION_GET_SIGNBIT(&du); +} + +DUK_INTERNAL duk_double_t duk_double_trunc_towards_zero(duk_double_t x) { + /* XXX: optimize */ + duk_small_uint_t s = duk_double_signbit(x); + x = DUK_FLOOR(DUK_FABS(x)); /* truncate towards zero */ + if (s) { + x = -x; + } + return x; +} + +DUK_INTERNAL duk_bool_t duk_double_same_sign(duk_double_t x, duk_double_t y) { + duk_double_union du1; + duk_double_union du2; + du1.d = x; + du2.d = y; + + return (((du1.ui[DUK_DBL_IDX_UI0] ^ du2.ui[DUK_DBL_IDX_UI0]) & 0x80000000UL) == 0); +} + +DUK_INTERNAL duk_double_t duk_double_fmin(duk_double_t x, duk_double_t y) { + /* Doesn't replicate fmin() behavior exactly: for fmin() if one + * argument is a NaN, the other argument should be returned. + * Duktape doesn't rely on this behavior so the replacement can + * be simplified. + */ + return (x < y ? x : y); +} + +DUK_INTERNAL duk_double_t duk_double_fmax(duk_double_t x, duk_double_t y) { + /* Doesn't replicate fmax() behavior exactly: for fmax() if one + * argument is a NaN, the other argument should be returned. + * Duktape doesn't rely on this behavior so the replacement can + * be simplified. + */ + return (x > y ? x : y); +} + +DUK_INTERNAL duk_bool_t duk_double_is_finite(duk_double_t x) { + return !duk_double_is_nan_or_inf(x); +} + +DUK_INTERNAL duk_bool_t duk_double_is_integer(duk_double_t x) { + if (duk_double_is_nan_or_inf(x)) { + return 0; + } else { + return duk_js_tointeger_number(x) == x; + } +} + +DUK_INTERNAL duk_bool_t duk_double_is_safe_integer(duk_double_t x) { + /* >>> 2**53-1 + * 9007199254740991 + */ + return duk_double_is_integer(x) && DUK_FABS(x) <= 9007199254740991.0; +} + +/* Check whether a duk_double_t is a whole number in the 32-bit range (reject + * negative zero), and if so, return a duk_int32_t. + * For compiler use: don't allow negative zero as it will cause trouble with + * LDINT+LDINTX, positive zero is OK. + */ +DUK_INTERNAL duk_bool_t duk_is_whole_get_int32_nonegzero(duk_double_t x, duk_int32_t *ival) { + duk_int32_t t; + + t = duk_double_to_int32_t(x); + if (!((duk_double_t) t == x)) { + return 0; + } + if (t == 0) { + duk_double_union du; + du.d = x; + if (DUK_DBLUNION_HAS_SIGNBIT(&du)) { + return 0; + } + } + *ival = t; + return 1; +} + +/* Check whether a duk_double_t is a whole number in the 32-bit range, and if + * so, return a duk_int32_t. + */ +DUK_INTERNAL duk_bool_t duk_is_whole_get_int32(duk_double_t x, duk_int32_t *ival) { + duk_int32_t t; + + t = duk_double_to_int32_t(x); + if (!((duk_double_t) t == x)) { + return 0; + } + *ival = t; + return 1; +} + +/* Division: division by zero is undefined behavior (and may in fact trap) + * so it needs special handling for portability. + */ + +DUK_INTERNAL DUK_INLINE duk_double_t duk_double_div(duk_double_t x, duk_double_t y) { +#if !defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) + if (DUK_UNLIKELY(y == 0.0)) { + /* In C99+ division by zero is undefined behavior so + * avoid it entirely. Hopefully the compiler is + * smart enough to avoid emitting any actual code + * because almost all practical platforms behave as + * expected. + */ + if (x > 0.0) { + if (DUK_SIGNBIT(y)) { + return -DUK_DOUBLE_INFINITY; + } else { + return DUK_DOUBLE_INFINITY; + } + } else if (x < 0.0) { + if (DUK_SIGNBIT(y)) { + return DUK_DOUBLE_INFINITY; + } else { + return -DUK_DOUBLE_INFINITY; + } + } else { + /* +/- 0, NaN */ + return DUK_DOUBLE_NAN; + } + } +#endif + + return x / y; +} +#line 1 "duk_util_hashbytes.c" +/* + * Hash function duk_util_hashbytes(). + * + * Currently, 32-bit MurmurHash2. + * + * Don't rely on specific hash values; hash function may be endianness + * dependent, for instance. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_STRHASH_DENSE) +/* 'magic' constants for Murmurhash2 */ +#define DUK__MAGIC_M ((duk_uint32_t) 0x5bd1e995UL) +#define DUK__MAGIC_R 24 + +DUK_INTERNAL duk_uint32_t duk_util_hashbytes(const duk_uint8_t *data, duk_size_t len, duk_uint32_t seed) { + duk_uint32_t h = seed ^ ((duk_uint32_t) len); + + while (len >= 4) { + /* Portability workaround is required for platforms without + * unaligned access. The replacement code emulates little + * endian access even on big endian architectures, which is + * OK as long as it is consistent for a build. + */ +#if defined(DUK_USE_HASHBYTES_UNALIGNED_U32_ACCESS) + duk_uint32_t k = *((const duk_uint32_t *) (const void *) data); +#else + duk_uint32_t k = ((duk_uint32_t) data[0]) | + (((duk_uint32_t) data[1]) << 8) | + (((duk_uint32_t) data[2]) << 16) | + (((duk_uint32_t) data[3]) << 24); +#endif + + k *= DUK__MAGIC_M; + k ^= k >> DUK__MAGIC_R; + k *= DUK__MAGIC_M; + h *= DUK__MAGIC_M; + h ^= k; + data += 4; + len -= 4; + } + + switch (len) { + case 3: h ^= data[2] << 16; + case 2: h ^= data[1] << 8; + case 1: h ^= data[0]; + h *= DUK__MAGIC_M; + } + + h ^= h >> 13; + h *= DUK__MAGIC_M; + h ^= h >> 15; + + return h; +} +#endif /* DUK_USE_STRHASH_DENSE */ + +/* automatic undefs */ +#undef DUK__MAGIC_M +#undef DUK__MAGIC_R +#line 1 "duk_util_memory.c" +/* + * Memory utils. + */ + +/* #include duk_internal.h -> already included */ + +#if defined(DUK_USE_ALLOW_UNDEFINED_BEHAVIOR) +DUK_INTERNAL DUK_INLINE duk_small_int_t duk_memcmp_unsafe(const void *s1, const void *s2, duk_size_t len) { + DUK_ASSERT(s1 != NULL || len == 0U); + DUK_ASSERT(s2 != NULL || len == 0U); + return DUK_MEMCMP(s1, s2, (size_t) len); +} + +DUK_INTERNAL DUK_INLINE duk_small_int_t duk_memcmp(const void *s1, const void *s2, duk_size_t len) { + DUK_ASSERT(s1 != NULL); + DUK_ASSERT(s2 != NULL); + return DUK_MEMCMP(s1, s2, (size_t) len); +} +#else /* DUK_USE_ALLOW_UNDEFINED_BEHAVIOR */ +DUK_INTERNAL DUK_INLINE duk_small_int_t duk_memcmp_unsafe(const void *s1, const void *s2, duk_size_t len) { + DUK_ASSERT(s1 != NULL || len == 0U); + DUK_ASSERT(s2 != NULL || len == 0U); + if (DUK_UNLIKELY(len == 0U)) { + return 0; + } + DUK_ASSERT(s1 != NULL); + DUK_ASSERT(s2 != NULL); + return duk_memcmp(s1, s2, len); +} + +DUK_INTERNAL DUK_INLINE duk_small_int_t duk_memcmp(const void *s1, const void *s2, duk_size_t len) { + DUK_ASSERT(s1 != NULL); + DUK_ASSERT(s2 != NULL); + return DUK_MEMCMP(s1, s2, (size_t) len); +} +#endif /* DUK_USE_ALLOW_UNDEFINED_BEHAVIOR */ +#line 1 "duk_util_tinyrandom.c" +/* + * A tiny random number generator used for Math.random() and other internals. + * + * Default algorithm is xoroshiro128+: http://xoroshiro.di.unimi.it/xoroshiro128plus.c + * with SplitMix64 seed preparation: http://xorshift.di.unimi.it/splitmix64.c. + * + * Low memory targets and targets without 64-bit types use a slightly smaller + * (but slower) algorithm by Adi Shamir: + * http://www.woodmann.com/forum/archive/index.php/t-3100.html. + * + */ + +/* #include duk_internal.h -> already included */ + +#if !defined(DUK_USE_GET_RANDOM_DOUBLE) + +#if defined(DUK_USE_PREFER_SIZE) || !defined(DUK_USE_64BIT_OPS) +#define DUK__RANDOM_SHAMIR3OP +#else +#define DUK__RANDOM_XOROSHIRO128PLUS +#endif + +#if defined(DUK__RANDOM_SHAMIR3OP) +#define DUK__UPDATE_RND(rnd) do { \ + (rnd) += ((rnd) * (rnd)) | 0x05UL; \ + (rnd) = ((rnd) & 0xffffffffUL); /* if duk_uint32_t is exactly 32 bits, this is a NOP */ \ + } while (0) + +#define DUK__RND_BIT(rnd) ((rnd) >> 31) /* only use the highest bit */ + +DUK_INTERNAL void duk_util_tinyrandom_prepare_seed(duk_hthread *thr) { + DUK_UNREF(thr); /* Nothing now. */ +} + +DUK_INTERNAL duk_double_t duk_util_tinyrandom_get_double(duk_hthread *thr) { + duk_double_t t; + duk_small_int_t n; + duk_uint32_t rnd; + + rnd = thr->heap->rnd_state; + + n = 53; /* enough to cover the whole mantissa */ + t = 0.0; + + do { + DUK__UPDATE_RND(rnd); + t += DUK__RND_BIT(rnd); + t /= 2.0; + } while (--n); + + thr->heap->rnd_state = rnd; + + DUK_ASSERT(t >= (duk_double_t) 0.0); + DUK_ASSERT(t < (duk_double_t) 1.0); + + return t; +} +#endif /* DUK__RANDOM_SHAMIR3OP */ + +#if defined(DUK__RANDOM_XOROSHIRO128PLUS) +DUK_LOCAL DUK_ALWAYS_INLINE duk_uint64_t duk__rnd_splitmix64(duk_uint64_t *x) { + duk_uint64_t z; + z = (*x += DUK_U64_CONSTANT(0x9E3779B97F4A7C15)); + z = (z ^ (z >> 30U)) * DUK_U64_CONSTANT(0xBF58476D1CE4E5B9); + z = (z ^ (z >> 27U)) * DUK_U64_CONSTANT(0x94D049BB133111EB); + return z ^ (z >> 31U); +} + +DUK_LOCAL DUK_ALWAYS_INLINE duk_uint64_t duk__rnd_rotl(const duk_uint64_t x, duk_small_uint_t k) { + return (x << k) | (x >> (64U - k)); +} + +DUK_LOCAL DUK_ALWAYS_INLINE duk_uint64_t duk__xoroshiro128plus(duk_uint64_t *s) { + duk_uint64_t s0; + duk_uint64_t s1; + duk_uint64_t res; + + s0 = s[0]; + s1 = s[1]; + res = s0 + s1; + s1 ^= s0; + s[0] = duk__rnd_rotl(s0, 55) ^ s1 ^ (s1 << 14U); + s[1] = duk__rnd_rotl(s1, 36); + + return res; +} + +DUK_INTERNAL void duk_util_tinyrandom_prepare_seed(duk_hthread *thr) { + duk_small_uint_t i; + duk_uint64_t x; + + /* Mix both halves of the initial seed with SplitMix64. The intent + * is to ensure that very similar raw seeds (which is usually the case + * because current seed is Date.now()) result in different xoroshiro128+ + * seeds. + */ + x = thr->heap->rnd_state[0]; /* Only [0] is used as input here. */ + for (i = 0; i < 64; i++) { + thr->heap->rnd_state[i & 0x01] = duk__rnd_splitmix64(&x); /* Keep last 2 values. */ + } +} + +DUK_INTERNAL duk_double_t duk_util_tinyrandom_get_double(duk_hthread *thr) { + duk_uint64_t v; + duk_double_union du; + + /* For big and little endian the integer and IEEE double byte order + * is the same so a direct assignment works. For mixed endian the + * 32-bit parts must be swapped. + */ + v = (DUK_U64_CONSTANT(0x3ff) << 52U) | (duk__xoroshiro128plus((duk_uint64_t *) thr->heap->rnd_state) >> 12U); + du.ull[0] = v; +#if defined(DUK_USE_DOUBLE_ME) + do { + duk_uint32_t tmp; + tmp = du.ui[0]; + du.ui[0] = du.ui[1]; + du.ui[1] = tmp; + } while (0); +#endif + return du.d - 1.0; +} +#endif /* DUK__RANDOM_XOROSHIRO128PLUS */ + +#endif /* !DUK_USE_GET_RANDOM_DOUBLE */ + +/* automatic undefs */ +#undef DUK__RANDOM_SHAMIR3OP +#undef DUK__RANDOM_XOROSHIRO128PLUS +#undef DUK__RND_BIT +#undef DUK__UPDATE_RND diff --git a/src/duktape.h b/src/duktape.h new file mode 100644 index 00000000..36f8060f --- /dev/null +++ b/src/duktape.h @@ -0,0 +1,1419 @@ +/* + * Duktape public API for Duktape 2.3.0. + * + * See the API reference for documentation on call semantics. The exposed, + * supported API is between the "BEGIN PUBLIC API" and "END PUBLIC API" + * comments. Other parts of the header are Duktape internal and related to + * e.g. platform/compiler/feature detection. + * + * Git commit d7fdb67f18561a50e06bafd196c6b423af9ad6fe (v2.3.0). + * Git branch master. + * + * See Duktape AUTHORS.rst and LICENSE.txt for copyright and + * licensing information. + */ + +/* LICENSE.txt */ +/* + * =============== + * Duktape license + * =============== + * + * (http://opensource.org/licenses/MIT) + * + * Copyright (c) 2013-2018 by Duktape authors (see AUTHORS.rst) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/* AUTHORS.rst */ +/* + * =============== + * Duktape authors + * =============== + * + * Copyright + * ========= + * + * Duktape copyrights are held by its authors. Each author has a copyright + * to their contribution, and agrees to irrevocably license the contribution + * under the Duktape ``LICENSE.txt``. + * + * Authors + * ======= + * + * Please include an e-mail address, a link to your GitHub profile, or something + * similar to allow your contribution to be identified accurately. + * + * The following people have contributed code, website contents, or Wiki contents, + * and agreed to irrevocably license their contributions under the Duktape + * ``LICENSE.txt`` (in order of appearance): + * + * * Sami Vaarala <sami.vaarala@iki.fi> + * * Niki Dobrev + * * Andreas \u00d6man <andreas@lonelycoder.com> + * * L\u00e1szl\u00f3 Lang\u00f3 <llango.u-szeged@partner.samsung.com> + * * Legimet <legimet.calc@gmail.com> + * * Karl Skomski <karl@skomski.com> + * * Bruce Pascoe <fatcerberus1@gmail.com> + * * Ren\u00e9 Hollander <rene@rene8888.at> + * * Julien Hamaide (https://github.com/crazyjul) + * * Sebastian G\u00f6tte (https://github.com/jaseg) + * * Tomasz Magulski (https://github.com/magul) + * * \D. Bohdan (https://github.com/dbohdan) + * * Ond\u0159ej Jirman (https://github.com/megous) + * * Sa\u00fal Ibarra Corretg\u00e9 <saghul@gmail.com> + * * Jeremy HU <huxingyi@msn.com> + * * Ole Andr\u00e9 Vadla Ravn\u00e5s (https://github.com/oleavr) + * * Harold Brenes (https://github.com/harold-b) + * * Oliver Crow (https://github.com/ocrow) + * * Jakub Ch\u0142api\u0144ski (https://github.com/jchlapinski) + * * Brett Vickers (https://github.com/beevik) + * * Dominik Okwieka (https://github.com/okitec) + * * Remko Tron\u00e7on (https://el-tramo.be) + * * Romero Malaquias (rbsm@ic.ufal.br) + * * Michael Drake <michael.drake@codethink.co.uk> + * * Steven Don (https://github.com/shdon) + * * Simon Stone (https://github.com/sstone1) + * * \J. McC. (https://github.com/jmhmccr) + * * Jakub Nowakowski (https://github.com/jimvonmoon) + * * Tommy Nguyen (https://github.com/tn0502) + * * Fabrice Fontaine (https://github.com/ffontaine) + * * Christopher Hiller (https://github.com/boneskull) + * * Gonzalo Diethelm (https://github.com/gonzus) + * * Michal Kasperek (https://github.com/michalkas) + * * Andrew Janke (https://github.com/apjanke) + * * Steve Fan (https://github.com/stevefan1999) + * + * Other contributions + * =================== + * + * The following people have contributed something other than code (e.g. reported + * bugs, provided ideas, etc; roughly in order of appearance): + * + * * Greg Burns + * * Anthony Rabine + * * Carlos Costa + * * Aur\u00e9lien Bouilland + * * Preet Desai (Pris Matic) + * * judofyr (http://www.reddit.com/user/judofyr) + * * Jason Woofenden + * * Micha\u0142 Przyby\u015b + * * Anthony Howe + * * Conrad Pankoff + * * Jim Schimpf + * * Rajaran Gaunker (https://github.com/zimbabao) + * * Andreas \u00d6man + * * Doug Sanden + * * Josh Engebretson (https://github.com/JoshEngebretson) + * * Remo Eichenberger (https://github.com/remoe) + * * Mamod Mehyar (https://github.com/mamod) + * * David Demelier (https://github.com/markand) + * * Tim Caswell (https://github.com/creationix) + * * Mitchell Blank Jr (https://github.com/mitchblank) + * * https://github.com/yushli + * * Seo Sanghyeon (https://github.com/sanxiyn) + * * Han ChoongWoo (https://github.com/tunz) + * * Joshua Peek (https://github.com/josh) + * * Bruce E. Pascoe (https://github.com/fatcerberus) + * * https://github.com/Kelledin + * * https://github.com/sstruchtrup + * * Michael Drake (https://github.com/tlsa) + * * https://github.com/chris-y + * * Laurent Zubiaur (https://github.com/lzubiaur) + * * Neil Kolban (https://github.com/nkolban) + * * Wilhelm Wanecek (https://github.com/wanecek) + * * Andrew Janke (https://github.com/apjanke) + * + * If you are accidentally missing from this list, send me an e-mail + * (``sami.vaarala@iki.fi``) and I'll fix the omission. + */ + +#if !defined(DUKTAPE_H_INCLUDED) +#define DUKTAPE_H_INCLUDED + +#define DUK_SINGLE_FILE + +/* + * BEGIN PUBLIC API + */ + +/* + * Version and Git commit identification + */ + +/* Duktape version, (major * 10000) + (minor * 100) + patch. Allows C code + * to #if (DUK_VERSION >= NNN) against Duktape API version. The same value + * is also available to ECMAScript code in Duktape.version. Unofficial + * development snapshots have 99 for patch level (e.g. 0.10.99 would be a + * development version after 0.10.0 but before the next official release). + */ +#define DUK_VERSION 20300L + +/* Git commit, describe, and branch for Duktape build. Useful for + * non-official snapshot builds so that application code can easily log + * which Duktape snapshot was used. Not available in the ECMAScript + * environment. + */ +#define DUK_GIT_COMMIT "d7fdb67f18561a50e06bafd196c6b423af9ad6fe" +#define DUK_GIT_DESCRIBE "v2.3.0" +#define DUK_GIT_BRANCH "master" + +/* External duk_config.h provides platform/compiler/OS dependent + * typedefs and macros, and DUK_USE_xxx config options so that + * the rest of Duktape doesn't need to do any feature detection. + * DUK_VERSION is defined before including so that configuration + * snippets can react to it. + */ +#include "duk_config.h" + +/* + * Avoid C++ name mangling + */ + +#if defined(__cplusplus) +extern "C" { +#endif + +/* + * Some defines forwarded from feature detection + */ + +#undef DUK_API_VARIADIC_MACROS +#if defined(DUK_USE_VARIADIC_MACROS) +#define DUK_API_VARIADIC_MACROS +#endif + +#define DUK_API_NORETURN(decl) DUK_NORETURN(decl) + +/* + * Public API specific typedefs + * + * Many types are wrapped by Duktape for portability to rare platforms + * where e.g. 'int' is a 16-bit type. See practical typing discussion + * in Duktape web documentation. + */ + +struct duk_thread_state; +struct duk_memory_functions; +struct duk_function_list_entry; +struct duk_number_list_entry; +struct duk_time_components; + +/* duk_context is now defined in duk_config.h because it may also be + * referenced there by prototypes. + */ +typedef struct duk_thread_state duk_thread_state; +typedef struct duk_memory_functions duk_memory_functions; +typedef struct duk_function_list_entry duk_function_list_entry; +typedef struct duk_number_list_entry duk_number_list_entry; +typedef struct duk_time_components duk_time_components; + +typedef duk_ret_t (*duk_c_function)(duk_context *ctx); +typedef void *(*duk_alloc_function) (void *udata, duk_size_t size); +typedef void *(*duk_realloc_function) (void *udata, void *ptr, duk_size_t size); +typedef void (*duk_free_function) (void *udata, void *ptr); +typedef void (*duk_fatal_function) (void *udata, const char *msg); +typedef void (*duk_decode_char_function) (void *udata, duk_codepoint_t codepoint); +typedef duk_codepoint_t (*duk_map_char_function) (void *udata, duk_codepoint_t codepoint); +typedef duk_ret_t (*duk_safe_call_function) (duk_context *ctx, void *udata); +typedef duk_size_t (*duk_debug_read_function) (void *udata, char *buffer, duk_size_t length); +typedef duk_size_t (*duk_debug_write_function) (void *udata, const char *buffer, duk_size_t length); +typedef duk_size_t (*duk_debug_peek_function) (void *udata); +typedef void (*duk_debug_read_flush_function) (void *udata); +typedef void (*duk_debug_write_flush_function) (void *udata); +typedef duk_idx_t (*duk_debug_request_function) (duk_context *ctx, void *udata, duk_idx_t nvalues); +typedef void (*duk_debug_detached_function) (duk_context *ctx, void *udata); + +struct duk_thread_state { + /* XXX: Enough space to hold internal suspend/resume structure. + * This is rather awkward and to be fixed when the internal + * structure is visible for the public API header. + */ + char data[128]; +}; + +struct duk_memory_functions { + duk_alloc_function alloc_func; + duk_realloc_function realloc_func; + duk_free_function free_func; + void *udata; +}; + +struct duk_function_list_entry { + const char *key; + duk_c_function value; + duk_idx_t nargs; +}; + +struct duk_number_list_entry { + const char *key; + duk_double_t value; +}; + +struct duk_time_components { + duk_double_t year; /* year, e.g. 2016, ECMAScript year range */ + duk_double_t month; /* month: 1-12 */ + duk_double_t day; /* day: 1-31 */ + duk_double_t hours; /* hour: 0-59 */ + duk_double_t minutes; /* minute: 0-59 */ + duk_double_t seconds; /* second: 0-59 (in POSIX time no leap second) */ + duk_double_t milliseconds; /* may contain sub-millisecond fractions */ + duk_double_t weekday; /* weekday: 0-6, 0=Sunday, 1=Monday, ..., 6=Saturday */ +}; + +/* + * Constants + */ + +/* Duktape debug protocol version used by this build. */ +#define DUK_DEBUG_PROTOCOL_VERSION 2 + +/* Used to represent invalid index; if caller uses this without checking, + * this index will map to a non-existent stack entry. Also used in some + * API calls as a marker to denote "no value". + */ +#define DUK_INVALID_INDEX DUK_IDX_MIN + +/* Indicates that a native function does not have a fixed number of args, + * and the argument stack should not be capped/extended at all. + */ +#define DUK_VARARGS ((duk_int_t) (-1)) + +/* Number of value stack entries (in addition to actual call arguments) + * guaranteed to be allocated on entry to a Duktape/C function. + */ +#define DUK_API_ENTRY_STACK 64U + +/* Value types, used by e.g. duk_get_type() */ +#define DUK_TYPE_MIN 0U +#define DUK_TYPE_NONE 0U /* no value, e.g. invalid index */ +#define DUK_TYPE_UNDEFINED 1U /* ECMAScript undefined */ +#define DUK_TYPE_NULL 2U /* ECMAScript null */ +#define DUK_TYPE_BOOLEAN 3U /* ECMAScript boolean: 0 or 1 */ +#define DUK_TYPE_NUMBER 4U /* ECMAScript number: double */ +#define DUK_TYPE_STRING 5U /* ECMAScript string: CESU-8 / extended UTF-8 encoded */ +#define DUK_TYPE_OBJECT 6U /* ECMAScript object: includes objects, arrays, functions, threads */ +#define DUK_TYPE_BUFFER 7U /* fixed or dynamic, garbage collected byte buffer */ +#define DUK_TYPE_POINTER 8U /* raw void pointer */ +#define DUK_TYPE_LIGHTFUNC 9U /* lightweight function pointer */ +#define DUK_TYPE_MAX 9U + +/* Value mask types, used by e.g. duk_get_type_mask() */ +#define DUK_TYPE_MASK_NONE (1U << DUK_TYPE_NONE) +#define DUK_TYPE_MASK_UNDEFINED (1U << DUK_TYPE_UNDEFINED) +#define DUK_TYPE_MASK_NULL (1U << DUK_TYPE_NULL) +#define DUK_TYPE_MASK_BOOLEAN (1U << DUK_TYPE_BOOLEAN) +#define DUK_TYPE_MASK_NUMBER (1U << DUK_TYPE_NUMBER) +#define DUK_TYPE_MASK_STRING (1U << DUK_TYPE_STRING) +#define DUK_TYPE_MASK_OBJECT (1U << DUK_TYPE_OBJECT) +#define DUK_TYPE_MASK_BUFFER (1U << DUK_TYPE_BUFFER) +#define DUK_TYPE_MASK_POINTER (1U << DUK_TYPE_POINTER) +#define DUK_TYPE_MASK_LIGHTFUNC (1U << DUK_TYPE_LIGHTFUNC) +#define DUK_TYPE_MASK_THROW (1U << 10) /* internal flag value: throw if mask doesn't match */ +#define DUK_TYPE_MASK_PROMOTE (1U << 11) /* internal flag value: promote to object if mask matches */ + +/* Coercion hints */ +#define DUK_HINT_NONE 0 /* prefer number, unless input is a Date, in which + * case prefer string (E5 Section 8.12.8) + */ +#define DUK_HINT_STRING 1 /* prefer string */ +#define DUK_HINT_NUMBER 2 /* prefer number */ + +/* Enumeration flags for duk_enum() */ +#define DUK_ENUM_INCLUDE_NONENUMERABLE (1U << 0) /* enumerate non-numerable properties in addition to enumerable */ +#define DUK_ENUM_INCLUDE_HIDDEN (1U << 1) /* enumerate hidden symbols too (in Duktape 1.x called internal properties) */ +#define DUK_ENUM_INCLUDE_SYMBOLS (1U << 2) /* enumerate symbols */ +#define DUK_ENUM_EXCLUDE_STRINGS (1U << 3) /* exclude strings */ +#define DUK_ENUM_OWN_PROPERTIES_ONLY (1U << 4) /* don't walk prototype chain, only check own properties */ +#define DUK_ENUM_ARRAY_INDICES_ONLY (1U << 5) /* only enumerate array indices */ +/* XXX: misleading name */ +#define DUK_ENUM_SORT_ARRAY_INDICES (1U << 6) /* sort array indices (applied to full enumeration result, including inherited array indices); XXX: misleading name */ +#define DUK_ENUM_NO_PROXY_BEHAVIOR (1U << 7) /* enumerate a proxy object itself without invoking proxy behavior */ + +/* Compilation flags for duk_compile() and duk_eval() */ +/* DUK_COMPILE_xxx bits 0-2 are reserved for an internal 'nargs' argument. + */ +#define DUK_COMPILE_EVAL (1U << 3) /* compile eval code (instead of global code) */ +#define DUK_COMPILE_FUNCTION (1U << 4) /* compile function code (instead of global code) */ +#define DUK_COMPILE_STRICT (1U << 5) /* use strict (outer) context for global, eval, or function code */ +#define DUK_COMPILE_SHEBANG (1U << 6) /* allow shebang ('#! ...') comment on first line of source */ +#define DUK_COMPILE_SAFE (1U << 7) /* (internal) catch compilation errors */ +#define DUK_COMPILE_NORESULT (1U << 8) /* (internal) omit eval result */ +#define DUK_COMPILE_NOSOURCE (1U << 9) /* (internal) no source string on stack */ +#define DUK_COMPILE_STRLEN (1U << 10) /* (internal) take strlen() of src_buffer (avoids double evaluation in macro) */ +#define DUK_COMPILE_NOFILENAME (1U << 11) /* (internal) no filename on stack */ +#define DUK_COMPILE_FUNCEXPR (1U << 12) /* (internal) source is a function expression (used for Function constructor) */ + +/* Flags for duk_def_prop() and its variants; base flags + a lot of convenience shorthands */ +#define DUK_DEFPROP_WRITABLE (1U << 0) /* set writable (effective if DUK_DEFPROP_HAVE_WRITABLE set) */ +#define DUK_DEFPROP_ENUMERABLE (1U << 1) /* set enumerable (effective if DUK_DEFPROP_HAVE_ENUMERABLE set) */ +#define DUK_DEFPROP_CONFIGURABLE (1U << 2) /* set configurable (effective if DUK_DEFPROP_HAVE_CONFIGURABLE set) */ +#define DUK_DEFPROP_HAVE_WRITABLE (1U << 3) /* set/clear writable */ +#define DUK_DEFPROP_HAVE_ENUMERABLE (1U << 4) /* set/clear enumerable */ +#define DUK_DEFPROP_HAVE_CONFIGURABLE (1U << 5) /* set/clear configurable */ +#define DUK_DEFPROP_HAVE_VALUE (1U << 6) /* set value (given on value stack) */ +#define DUK_DEFPROP_HAVE_GETTER (1U << 7) /* set getter (given on value stack) */ +#define DUK_DEFPROP_HAVE_SETTER (1U << 8) /* set setter (given on value stack) */ +#define DUK_DEFPROP_FORCE (1U << 9) /* force change if possible, may still fail for e.g. virtual properties */ +#define DUK_DEFPROP_SET_WRITABLE (DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_WRITABLE) +#define DUK_DEFPROP_CLEAR_WRITABLE DUK_DEFPROP_HAVE_WRITABLE +#define DUK_DEFPROP_SET_ENUMERABLE (DUK_DEFPROP_HAVE_ENUMERABLE | DUK_DEFPROP_ENUMERABLE) +#define DUK_DEFPROP_CLEAR_ENUMERABLE DUK_DEFPROP_HAVE_ENUMERABLE +#define DUK_DEFPROP_SET_CONFIGURABLE (DUK_DEFPROP_HAVE_CONFIGURABLE | DUK_DEFPROP_CONFIGURABLE) +#define DUK_DEFPROP_CLEAR_CONFIGURABLE DUK_DEFPROP_HAVE_CONFIGURABLE +#define DUK_DEFPROP_W DUK_DEFPROP_WRITABLE +#define DUK_DEFPROP_E DUK_DEFPROP_ENUMERABLE +#define DUK_DEFPROP_C DUK_DEFPROP_CONFIGURABLE +#define DUK_DEFPROP_WE (DUK_DEFPROP_WRITABLE | DUK_DEFPROP_ENUMERABLE) +#define DUK_DEFPROP_WC (DUK_DEFPROP_WRITABLE | DUK_DEFPROP_CONFIGURABLE) +#define DUK_DEFPROP_WEC (DUK_DEFPROP_WRITABLE | DUK_DEFPROP_ENUMERABLE | DUK_DEFPROP_CONFIGURABLE) +#define DUK_DEFPROP_HAVE_W DUK_DEFPROP_HAVE_WRITABLE +#define DUK_DEFPROP_HAVE_E DUK_DEFPROP_HAVE_ENUMERABLE +#define DUK_DEFPROP_HAVE_C DUK_DEFPROP_HAVE_CONFIGURABLE +#define DUK_DEFPROP_HAVE_WE (DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_HAVE_ENUMERABLE) +#define DUK_DEFPROP_HAVE_WC (DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_HAVE_CONFIGURABLE) +#define DUK_DEFPROP_HAVE_WEC (DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_HAVE_ENUMERABLE | DUK_DEFPROP_HAVE_CONFIGURABLE) +#define DUK_DEFPROP_SET_W DUK_DEFPROP_SET_WRITABLE +#define DUK_DEFPROP_SET_E DUK_DEFPROP_SET_ENUMERABLE +#define DUK_DEFPROP_SET_C DUK_DEFPROP_SET_CONFIGURABLE +#define DUK_DEFPROP_SET_WE (DUK_DEFPROP_SET_WRITABLE | DUK_DEFPROP_SET_ENUMERABLE) +#define DUK_DEFPROP_SET_WC (DUK_DEFPROP_SET_WRITABLE | DUK_DEFPROP_SET_CONFIGURABLE) +#define DUK_DEFPROP_SET_WEC (DUK_DEFPROP_SET_WRITABLE | DUK_DEFPROP_SET_ENUMERABLE | DUK_DEFPROP_SET_CONFIGURABLE) +#define DUK_DEFPROP_CLEAR_W DUK_DEFPROP_CLEAR_WRITABLE +#define DUK_DEFPROP_CLEAR_E DUK_DEFPROP_CLEAR_ENUMERABLE +#define DUK_DEFPROP_CLEAR_C DUK_DEFPROP_CLEAR_CONFIGURABLE +#define DUK_DEFPROP_CLEAR_WE (DUK_DEFPROP_CLEAR_WRITABLE | DUK_DEFPROP_CLEAR_ENUMERABLE) +#define DUK_DEFPROP_CLEAR_WC (DUK_DEFPROP_CLEAR_WRITABLE | DUK_DEFPROP_CLEAR_CONFIGURABLE) +#define DUK_DEFPROP_CLEAR_WEC (DUK_DEFPROP_CLEAR_WRITABLE | DUK_DEFPROP_CLEAR_ENUMERABLE | DUK_DEFPROP_CLEAR_CONFIGURABLE) +#define DUK_DEFPROP_ATTR_W (DUK_DEFPROP_HAVE_WEC | DUK_DEFPROP_W) +#define DUK_DEFPROP_ATTR_E (DUK_DEFPROP_HAVE_WEC | DUK_DEFPROP_E) +#define DUK_DEFPROP_ATTR_C (DUK_DEFPROP_HAVE_WEC | DUK_DEFPROP_C) +#define DUK_DEFPROP_ATTR_WE (DUK_DEFPROP_HAVE_WEC | DUK_DEFPROP_WE) +#define DUK_DEFPROP_ATTR_WC (DUK_DEFPROP_HAVE_WEC | DUK_DEFPROP_WC) +#define DUK_DEFPROP_ATTR_WEC (DUK_DEFPROP_HAVE_WEC | DUK_DEFPROP_WEC) + +/* Flags for duk_push_thread_raw() */ +#define DUK_THREAD_NEW_GLOBAL_ENV (1U << 0) /* create a new global environment */ + +/* Flags for duk_gc() */ +#define DUK_GC_COMPACT (1U << 0) /* compact heap objects */ + +/* Error codes (must be 8 bits at most, see duk_error.h) */ +#define DUK_ERR_NONE 0 /* no error (e.g. from duk_get_error_code()) */ +#define DUK_ERR_ERROR 1 /* Error */ +#define DUK_ERR_EVAL_ERROR 2 /* EvalError */ +#define DUK_ERR_RANGE_ERROR 3 /* RangeError */ +#define DUK_ERR_REFERENCE_ERROR 4 /* ReferenceError */ +#define DUK_ERR_SYNTAX_ERROR 5 /* SyntaxError */ +#define DUK_ERR_TYPE_ERROR 6 /* TypeError */ +#define DUK_ERR_URI_ERROR 7 /* URIError */ + +/* Return codes for C functions (shortcut for throwing an error) */ +#define DUK_RET_ERROR (-DUK_ERR_ERROR) +#define DUK_RET_EVAL_ERROR (-DUK_ERR_EVAL_ERROR) +#define DUK_RET_RANGE_ERROR (-DUK_ERR_RANGE_ERROR) +#define DUK_RET_REFERENCE_ERROR (-DUK_ERR_REFERENCE_ERROR) +#define DUK_RET_SYNTAX_ERROR (-DUK_ERR_SYNTAX_ERROR) +#define DUK_RET_TYPE_ERROR (-DUK_ERR_TYPE_ERROR) +#define DUK_RET_URI_ERROR (-DUK_ERR_URI_ERROR) + +/* Return codes for protected calls (duk_safe_call(), duk_pcall()) */ +#define DUK_EXEC_SUCCESS 0 +#define DUK_EXEC_ERROR 1 + +/* Debug levels for DUK_USE_DEBUG_WRITE(). */ +#define DUK_LEVEL_DEBUG 0 +#define DUK_LEVEL_DDEBUG 1 +#define DUK_LEVEL_DDDEBUG 2 + +/* + * Macros to create Symbols as C statically constructed strings. + * + * Call e.g. as DUK_HIDDEN_SYMBOL("myProperty") <=> ("\xFF" "myProperty"). + * Local symbols have a unique suffix, caller should take care to avoid + * conflicting with the Duktape internal representation by e.g. prepending + * a '!' character: DUK_LOCAL_SYMBOL("myLocal", "!123"). + * + * Note that these can only be used for string constants, not dynamically + * created strings. + */ + +#define DUK_HIDDEN_SYMBOL(x) ("\xFF" x) +#define DUK_GLOBAL_SYMBOL(x) ("\x80" x) +#define DUK_LOCAL_SYMBOL(x,uniq) ("\x81" x "\xff" uniq) +#define DUK_WELLKNOWN_SYMBOL(x) ("\x81" x "\xff") + +/* + * If no variadic macros, __FILE__ and __LINE__ are passed through globals + * which is ugly and not thread safe. + */ + +#if !defined(DUK_API_VARIADIC_MACROS) +DUK_EXTERNAL_DECL const char *duk_api_global_filename; +DUK_EXTERNAL_DECL duk_int_t duk_api_global_line; +#endif + +/* + * Context management + */ + +DUK_EXTERNAL_DECL +duk_context *duk_create_heap(duk_alloc_function alloc_func, + duk_realloc_function realloc_func, + duk_free_function free_func, + void *heap_udata, + duk_fatal_function fatal_handler); +DUK_EXTERNAL_DECL void duk_destroy_heap(duk_context *ctx); + +DUK_EXTERNAL_DECL void duk_suspend(duk_context *ctx, duk_thread_state *state); +DUK_EXTERNAL_DECL void duk_resume(duk_context *ctx, const duk_thread_state *state); + +#define duk_create_heap_default() \ + duk_create_heap(NULL, NULL, NULL, NULL, NULL) + +/* + * Memory management + * + * Raw functions have no side effects (cannot trigger GC). + */ + +DUK_EXTERNAL_DECL void *duk_alloc_raw(duk_context *ctx, duk_size_t size); +DUK_EXTERNAL_DECL void duk_free_raw(duk_context *ctx, void *ptr); +DUK_EXTERNAL_DECL void *duk_realloc_raw(duk_context *ctx, void *ptr, duk_size_t size); +DUK_EXTERNAL_DECL void *duk_alloc(duk_context *ctx, duk_size_t size); +DUK_EXTERNAL_DECL void duk_free(duk_context *ctx, void *ptr); +DUK_EXTERNAL_DECL void *duk_realloc(duk_context *ctx, void *ptr, duk_size_t size); +DUK_EXTERNAL_DECL void duk_get_memory_functions(duk_context *ctx, duk_memory_functions *out_funcs); +DUK_EXTERNAL_DECL void duk_gc(duk_context *ctx, duk_uint_t flags); + +/* + * Error handling + */ + +DUK_API_NORETURN(DUK_EXTERNAL_DECL void duk_throw_raw(duk_context *ctx)); +#define duk_throw(ctx) \ + (duk_throw_raw((ctx)), (duk_ret_t) 0) +DUK_API_NORETURN(DUK_EXTERNAL_DECL void duk_fatal_raw(duk_context *ctx, const char *err_msg)); +#define duk_fatal(ctx,err_msg) \ + (duk_fatal_raw((ctx), (err_msg)), (duk_ret_t) 0) +DUK_API_NORETURN(DUK_EXTERNAL_DECL void duk_error_raw(duk_context *ctx, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, ...)); + +#if defined(DUK_API_VARIADIC_MACROS) +#define duk_error(ctx,err_code,...) \ + (duk_error_raw((ctx), (duk_errcode_t) (err_code), (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_generic_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_eval_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_EVAL_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_range_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_RANGE_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_reference_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_REFERENCE_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_syntax_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_SYNTAX_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_type_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_TYPE_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#define duk_uri_error(ctx,...) \ + (duk_error_raw((ctx), (duk_errcode_t) DUK_ERR_URI_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0) +#else /* DUK_API_VARIADIC_MACROS */ +/* For legacy compilers without variadic macros a macro hack is used to allow + * variable arguments. While the macro allows "return duk_error(...)", it + * will fail with e.g. "(void) duk_error(...)". The calls are noreturn but + * with a return value to allow the "return duk_error(...)" idiom. This may + * cause some compiler warnings, but without noreturn the generated code is + * often worse. The same approach as with variadic macros (using + * "(duk_error(...), 0)") won't work due to the macro hack structure. + */ +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_error_stash(duk_context *ctx, duk_errcode_t err_code, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_generic_error_stash(duk_context *ctx, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_eval_error_stash(duk_context *ctx, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_range_error_stash(duk_context *ctx, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_reference_error_stash(duk_context *ctx, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_syntax_error_stash(duk_context *ctx, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_type_error_stash(duk_context *ctx, const char *fmt, ...)); +DUK_API_NORETURN(DUK_EXTERNAL_DECL duk_ret_t duk_uri_error_stash(duk_context *ctx, const char *fmt, ...)); +#define duk_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_error_stash) /* last value is func pointer, arguments follow in parens */ +#define duk_generic_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_generic_error_stash) +#define duk_eval_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_eval_error_stash) +#define duk_range_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_range_error_stash) +#define duk_reference_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_reference_error_stash) +#define duk_syntax_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_syntax_error_stash) +#define duk_type_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_type_error_stash) +#define duk_uri_error \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_uri_error_stash) +#endif /* DUK_API_VARIADIC_MACROS */ + +DUK_API_NORETURN(DUK_EXTERNAL_DECL void duk_error_va_raw(duk_context *ctx, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, va_list ap)); + +#define duk_error_va(ctx,err_code,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) (err_code), (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_generic_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_eval_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_EVAL_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_range_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_RANGE_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_reference_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_REFERENCE_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_syntax_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_SYNTAX_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_type_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_TYPE_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) +#define duk_uri_error_va(ctx,fmt,ap) \ + (duk_error_va_raw((ctx), (duk_errcode_t) DUK_ERR_URI_ERROR, (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)), (duk_ret_t) 0) + +/* + * Other state related functions + */ + +DUK_EXTERNAL_DECL duk_bool_t duk_is_strict_call(duk_context *ctx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_constructor_call(duk_context *ctx); + +/* + * Stack management + */ + +DUK_EXTERNAL_DECL duk_idx_t duk_normalize_index(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_idx_t duk_require_normalize_index(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_valid_index(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_require_valid_index(duk_context *ctx, duk_idx_t idx); + +DUK_EXTERNAL_DECL duk_idx_t duk_get_top(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_set_top(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_idx_t duk_get_top_index(duk_context *ctx); +DUK_EXTERNAL_DECL duk_idx_t duk_require_top_index(duk_context *ctx); + +/* Although extra/top could be an unsigned type here, using a signed type + * makes the API more robust to calling code calculation errors or corner + * cases (where caller might occasionally come up with negative values). + * Negative values are treated as zero, which is better than casting them + * to a large unsigned number. (This principle is used elsewhere in the + * API too.) + */ +DUK_EXTERNAL_DECL duk_bool_t duk_check_stack(duk_context *ctx, duk_idx_t extra); +DUK_EXTERNAL_DECL void duk_require_stack(duk_context *ctx, duk_idx_t extra); +DUK_EXTERNAL_DECL duk_bool_t duk_check_stack_top(duk_context *ctx, duk_idx_t top); +DUK_EXTERNAL_DECL void duk_require_stack_top(duk_context *ctx, duk_idx_t top); + +/* + * Stack manipulation (other than push/pop) + */ + +DUK_EXTERNAL_DECL void duk_swap(duk_context *ctx, duk_idx_t idx1, duk_idx_t idx2); +DUK_EXTERNAL_DECL void duk_swap_top(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_dup(duk_context *ctx, duk_idx_t from_idx); +DUK_EXTERNAL_DECL void duk_dup_top(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_insert(duk_context *ctx, duk_idx_t to_idx); +DUK_EXTERNAL_DECL void duk_replace(duk_context *ctx, duk_idx_t to_idx); +DUK_EXTERNAL_DECL void duk_copy(duk_context *ctx, duk_idx_t from_idx, duk_idx_t to_idx); +DUK_EXTERNAL_DECL void duk_remove(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_xcopymove_raw(duk_context *to_ctx, duk_context *from_ctx, duk_idx_t count, duk_bool_t is_copy); + +#define duk_xmove_top(to_ctx,from_ctx,count) \ + duk_xcopymove_raw((to_ctx), (from_ctx), (count), 0 /*is_copy*/) +#define duk_xcopy_top(to_ctx,from_ctx,count) \ + duk_xcopymove_raw((to_ctx), (from_ctx), (count), 1 /*is_copy*/) + +/* + * Push operations + * + * Push functions return the absolute (relative to bottom of frame) + * position of the pushed value for convenience. + * + * Note: duk_dup() is technically a push. + */ + +DUK_EXTERNAL_DECL void duk_push_undefined(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_null(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_boolean(duk_context *ctx, duk_bool_t val); +DUK_EXTERNAL_DECL void duk_push_true(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_false(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_number(duk_context *ctx, duk_double_t val); +DUK_EXTERNAL_DECL void duk_push_nan(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_int(duk_context *ctx, duk_int_t val); +DUK_EXTERNAL_DECL void duk_push_uint(duk_context *ctx, duk_uint_t val); +DUK_EXTERNAL_DECL const char *duk_push_string(duk_context *ctx, const char *str); +DUK_EXTERNAL_DECL const char *duk_push_lstring(duk_context *ctx, const char *str, duk_size_t len); +DUK_EXTERNAL_DECL void duk_push_pointer(duk_context *ctx, void *p); +DUK_EXTERNAL_DECL const char *duk_push_sprintf(duk_context *ctx, const char *fmt, ...); +DUK_EXTERNAL_DECL const char *duk_push_vsprintf(duk_context *ctx, const char *fmt, va_list ap); + +/* duk_push_literal() may evaluate its argument (a C string literal) more than + * once on purpose. When speed is preferred, sizeof() avoids an unnecessary + * strlen() at runtime. Sizeof("foo") == 4, so subtract 1. The argument + * must be non-NULL and should not contain internal NUL characters as the + * behavior will then depend on config options. + */ +#if defined(DUK_USE_PREFER_SIZE) +#define duk_push_literal(ctx,cstring) duk_push_string((ctx), (cstring)) +#else +DUK_EXTERNAL_DECL const char *duk_push_literal_raw(duk_context *ctx, const char *str, duk_size_t len); +#define duk_push_literal(ctx,cstring) duk_push_literal_raw((ctx), (cstring), sizeof((cstring)) - 1U) +#endif + +DUK_EXTERNAL_DECL void duk_push_this(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_new_target(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_current_function(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_current_thread(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_global_object(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_heap_stash(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_global_stash(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_push_thread_stash(duk_context *ctx, duk_context *target_ctx); + +DUK_EXTERNAL_DECL duk_idx_t duk_push_object(duk_context *ctx); +DUK_EXTERNAL_DECL duk_idx_t duk_push_bare_object(duk_context *ctx); +DUK_EXTERNAL_DECL duk_idx_t duk_push_array(duk_context *ctx); +DUK_EXTERNAL_DECL duk_idx_t duk_push_c_function(duk_context *ctx, duk_c_function func, duk_idx_t nargs); +DUK_EXTERNAL_DECL duk_idx_t duk_push_c_lightfunc(duk_context *ctx, duk_c_function func, duk_idx_t nargs, duk_idx_t length, duk_int_t magic); +DUK_EXTERNAL_DECL duk_idx_t duk_push_thread_raw(duk_context *ctx, duk_uint_t flags); +DUK_EXTERNAL_DECL duk_idx_t duk_push_proxy(duk_context *ctx, duk_uint_t proxy_flags); + +#define duk_push_thread(ctx) \ + duk_push_thread_raw((ctx), 0 /*flags*/) + +#define duk_push_thread_new_globalenv(ctx) \ + duk_push_thread_raw((ctx), DUK_THREAD_NEW_GLOBAL_ENV /*flags*/) + +DUK_EXTERNAL_DECL duk_idx_t duk_push_error_object_raw(duk_context *ctx, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, ...); + +#if defined(DUK_API_VARIADIC_MACROS) +#define duk_push_error_object(ctx,err_code,...) \ + duk_push_error_object_raw((ctx), (err_code), (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__) +#else +DUK_EXTERNAL_DECL duk_idx_t duk_push_error_object_stash(duk_context *ctx, duk_errcode_t err_code, const char *fmt, ...); +/* Note: parentheses are required so that the comma expression works in assignments. */ +#define duk_push_error_object \ + (duk_api_global_filename = (const char *) (DUK_FILE_MACRO), \ + duk_api_global_line = (duk_int_t) (DUK_LINE_MACRO), \ + duk_push_error_object_stash) /* last value is func pointer, arguments follow in parens */ +#endif + +DUK_EXTERNAL_DECL duk_idx_t duk_push_error_object_va_raw(duk_context *ctx, duk_errcode_t err_code, const char *filename, duk_int_t line, const char *fmt, va_list ap); +#define duk_push_error_object_va(ctx,err_code,fmt,ap) \ + duk_push_error_object_va_raw((ctx), (err_code), (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), (fmt), (ap)) + +#define DUK_BUF_FLAG_DYNAMIC (1 << 0) /* internal flag: dynamic buffer */ +#define DUK_BUF_FLAG_EXTERNAL (1 << 1) /* internal flag: external buffer */ +#define DUK_BUF_FLAG_NOZERO (1 << 2) /* internal flag: don't zero allocated buffer */ + +DUK_EXTERNAL_DECL void *duk_push_buffer_raw(duk_context *ctx, duk_size_t size, duk_small_uint_t flags); + +#define duk_push_buffer(ctx,size,dynamic) \ + duk_push_buffer_raw((ctx), (size), (dynamic) ? DUK_BUF_FLAG_DYNAMIC : 0) +#define duk_push_fixed_buffer(ctx,size) \ + duk_push_buffer_raw((ctx), (size), 0 /*flags*/) +#define duk_push_dynamic_buffer(ctx,size) \ + duk_push_buffer_raw((ctx), (size), DUK_BUF_FLAG_DYNAMIC /*flags*/) +#define duk_push_external_buffer(ctx) \ + ((void) duk_push_buffer_raw((ctx), 0, DUK_BUF_FLAG_DYNAMIC | DUK_BUF_FLAG_EXTERNAL)) + +#define DUK_BUFOBJ_ARRAYBUFFER 0 +#define DUK_BUFOBJ_NODEJS_BUFFER 1 +#define DUK_BUFOBJ_DATAVIEW 2 +#define DUK_BUFOBJ_INT8ARRAY 3 +#define DUK_BUFOBJ_UINT8ARRAY 4 +#define DUK_BUFOBJ_UINT8CLAMPEDARRAY 5 +#define DUK_BUFOBJ_INT16ARRAY 6 +#define DUK_BUFOBJ_UINT16ARRAY 7 +#define DUK_BUFOBJ_INT32ARRAY 8 +#define DUK_BUFOBJ_UINT32ARRAY 9 +#define DUK_BUFOBJ_FLOAT32ARRAY 10 +#define DUK_BUFOBJ_FLOAT64ARRAY 11 + +DUK_EXTERNAL_DECL void duk_push_buffer_object(duk_context *ctx, duk_idx_t idx_buffer, duk_size_t byte_offset, duk_size_t byte_length, duk_uint_t flags); + +DUK_EXTERNAL_DECL duk_idx_t duk_push_heapptr(duk_context *ctx, void *ptr); + +/* + * Pop operations + */ + +DUK_EXTERNAL_DECL void duk_pop(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_pop_n(duk_context *ctx, duk_idx_t count); +DUK_EXTERNAL_DECL void duk_pop_2(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_pop_3(duk_context *ctx); + +/* + * Type checks + * + * duk_is_none(), which would indicate whether index it outside of stack, + * is not needed; duk_is_valid_index() gives the same information. + */ + +DUK_EXTERNAL_DECL duk_int_t duk_get_type(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_check_type(duk_context *ctx, duk_idx_t idx, duk_int_t type); +DUK_EXTERNAL_DECL duk_uint_t duk_get_type_mask(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_check_type_mask(duk_context *ctx, duk_idx_t idx, duk_uint_t mask); + +DUK_EXTERNAL_DECL duk_bool_t duk_is_undefined(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_null(duk_context *ctx, duk_idx_t idx); +#define duk_is_null_or_undefined(ctx, idx) \ + ((duk_get_type_mask((ctx), (idx)) & (DUK_TYPE_MASK_NULL | DUK_TYPE_MASK_UNDEFINED)) ? 1 : 0) + +DUK_EXTERNAL_DECL duk_bool_t duk_is_boolean(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_number(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_nan(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_string(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_object(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_buffer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_buffer_data(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_pointer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_lightfunc(duk_context *ctx, duk_idx_t idx); + +DUK_EXTERNAL_DECL duk_bool_t duk_is_symbol(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_array(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_function(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_c_function(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_ecmascript_function(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_bound_function(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_thread(duk_context *ctx, duk_idx_t idx); + +#define duk_is_callable(ctx,idx) \ + duk_is_function((ctx), (idx)) +DUK_EXTERNAL_DECL duk_bool_t duk_is_constructable(duk_context *ctx, duk_idx_t idx); + +DUK_EXTERNAL_DECL duk_bool_t duk_is_dynamic_buffer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_fixed_buffer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_is_external_buffer(duk_context *ctx, duk_idx_t idx); + +/* Buffers and lightfuncs are not considered primitive because they mimic + * objects and e.g. duk_to_primitive() will coerce them instead of returning + * them as is. Symbols are represented as strings internally. + */ +#define duk_is_primitive(ctx,idx) \ + duk_check_type_mask((ctx), (idx), DUK_TYPE_MASK_UNDEFINED | \ + DUK_TYPE_MASK_NULL | \ + DUK_TYPE_MASK_BOOLEAN | \ + DUK_TYPE_MASK_NUMBER | \ + DUK_TYPE_MASK_STRING | \ + DUK_TYPE_MASK_POINTER) + +/* Symbols are object coercible, covered by DUK_TYPE_MASK_STRING. */ +#define duk_is_object_coercible(ctx,idx) \ + duk_check_type_mask((ctx), (idx), DUK_TYPE_MASK_BOOLEAN | \ + DUK_TYPE_MASK_NUMBER | \ + DUK_TYPE_MASK_STRING | \ + DUK_TYPE_MASK_OBJECT | \ + DUK_TYPE_MASK_BUFFER | \ + DUK_TYPE_MASK_POINTER | \ + DUK_TYPE_MASK_LIGHTFUNC) + +DUK_EXTERNAL_DECL duk_errcode_t duk_get_error_code(duk_context *ctx, duk_idx_t idx); +#define duk_is_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) != 0) +#define duk_is_eval_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) == DUK_ERR_EVAL_ERROR) +#define duk_is_range_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) == DUK_ERR_RANGE_ERROR) +#define duk_is_reference_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) == DUK_ERR_REFERENCE_ERROR) +#define duk_is_syntax_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) == DUK_ERR_SYNTAX_ERROR) +#define duk_is_type_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) == DUK_ERR_TYPE_ERROR) +#define duk_is_uri_error(ctx,idx) \ + (duk_get_error_code((ctx), (idx)) == DUK_ERR_URI_ERROR) + +/* + * Get operations: no coercion, returns default value for invalid + * indices and invalid value types. + * + * duk_get_undefined() and duk_get_null() would be pointless and + * are not included. + */ + +DUK_EXTERNAL_DECL duk_bool_t duk_get_boolean(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_double_t duk_get_number(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_int_t duk_get_int(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_uint_t duk_get_uint(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_get_string(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_get_lstring(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len); +DUK_EXTERNAL_DECL void *duk_get_buffer(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size); +DUK_EXTERNAL_DECL void *duk_get_buffer_data(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size); +DUK_EXTERNAL_DECL void *duk_get_pointer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_c_function duk_get_c_function(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_context *duk_get_context(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void *duk_get_heapptr(duk_context *ctx, duk_idx_t idx); + +/* + * Get-with-explicit default operations: like get operations but with an + * explicit default value. + */ + +DUK_EXTERNAL_DECL duk_bool_t duk_get_boolean_default(duk_context *ctx, duk_idx_t idx, duk_bool_t def_value); +DUK_EXTERNAL_DECL duk_double_t duk_get_number_default(duk_context *ctx, duk_idx_t idx, duk_double_t def_value); +DUK_EXTERNAL_DECL duk_int_t duk_get_int_default(duk_context *ctx, duk_idx_t idx, duk_int_t def_value); +DUK_EXTERNAL_DECL duk_uint_t duk_get_uint_default(duk_context *ctx, duk_idx_t idx, duk_uint_t def_value); +DUK_EXTERNAL_DECL const char *duk_get_string_default(duk_context *ctx, duk_idx_t idx, const char *def_value); +DUK_EXTERNAL_DECL const char *duk_get_lstring_default(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len, const char *def_ptr, duk_size_t def_len); +DUK_EXTERNAL_DECL void *duk_get_buffer_default(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_len); +DUK_EXTERNAL_DECL void *duk_get_buffer_data_default(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_len); +DUK_EXTERNAL_DECL void *duk_get_pointer_default(duk_context *ctx, duk_idx_t idx, void *def_value); +DUK_EXTERNAL_DECL duk_c_function duk_get_c_function_default(duk_context *ctx, duk_idx_t idx, duk_c_function def_value); +DUK_EXTERNAL_DECL duk_context *duk_get_context_default(duk_context *ctx, duk_idx_t idx, duk_context *def_value); +DUK_EXTERNAL_DECL void *duk_get_heapptr_default(duk_context *ctx, duk_idx_t idx, void *def_value); + +/* + * Opt operations: like require operations but with an explicit default value + * when value is undefined or index is invalid, null and non-matching types + * cause a TypeError. + */ + +DUK_EXTERNAL_DECL duk_bool_t duk_opt_boolean(duk_context *ctx, duk_idx_t idx, duk_bool_t def_value); +DUK_EXTERNAL_DECL duk_double_t duk_opt_number(duk_context *ctx, duk_idx_t idx, duk_double_t def_value); +DUK_EXTERNAL_DECL duk_int_t duk_opt_int(duk_context *ctx, duk_idx_t idx, duk_int_t def_value); +DUK_EXTERNAL_DECL duk_uint_t duk_opt_uint(duk_context *ctx, duk_idx_t idx, duk_uint_t def_value); +DUK_EXTERNAL_DECL const char *duk_opt_string(duk_context *ctx, duk_idx_t idx, const char *def_ptr); +DUK_EXTERNAL_DECL const char *duk_opt_lstring(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len, const char *def_ptr, duk_size_t def_len); +DUK_EXTERNAL_DECL void *duk_opt_buffer(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size); +DUK_EXTERNAL_DECL void *duk_opt_buffer_data(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size, void *def_ptr, duk_size_t def_size); +DUK_EXTERNAL_DECL void *duk_opt_pointer(duk_context *ctx, duk_idx_t idx, void *def_value); +DUK_EXTERNAL_DECL duk_c_function duk_opt_c_function(duk_context *ctx, duk_idx_t idx, duk_c_function def_value); +DUK_EXTERNAL_DECL duk_context *duk_opt_context(duk_context *ctx, duk_idx_t idx, duk_context *def_value); +DUK_EXTERNAL_DECL void *duk_opt_heapptr(duk_context *ctx, duk_idx_t idx, void *def_value); + +/* + * Require operations: no coercion, throw error if index or type + * is incorrect. No defaulting. + */ + +#define duk_require_type_mask(ctx,idx,mask) \ + ((void) duk_check_type_mask((ctx), (idx), (mask) | DUK_TYPE_MASK_THROW)) + +DUK_EXTERNAL_DECL void duk_require_undefined(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_require_null(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_require_boolean(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_double_t duk_require_number(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_int_t duk_require_int(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_uint_t duk_require_uint(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_require_string(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_require_lstring(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len); +DUK_EXTERNAL_DECL void duk_require_object(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void *duk_require_buffer(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size); +DUK_EXTERNAL_DECL void *duk_require_buffer_data(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size); +DUK_EXTERNAL_DECL void *duk_require_pointer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_c_function duk_require_c_function(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_context *duk_require_context(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_require_function(duk_context *ctx, duk_idx_t idx); +#define duk_require_callable(ctx,idx) \ + duk_require_function((ctx), (idx)) +DUK_EXTERNAL_DECL void *duk_require_heapptr(duk_context *ctx, duk_idx_t idx); + +/* Symbols are object coercible and covered by DUK_TYPE_MASK_STRING. */ +#define duk_require_object_coercible(ctx,idx) \ + ((void) duk_check_type_mask((ctx), (idx), DUK_TYPE_MASK_BOOLEAN | \ + DUK_TYPE_MASK_NUMBER | \ + DUK_TYPE_MASK_STRING | \ + DUK_TYPE_MASK_OBJECT | \ + DUK_TYPE_MASK_BUFFER | \ + DUK_TYPE_MASK_POINTER | \ + DUK_TYPE_MASK_LIGHTFUNC | \ + DUK_TYPE_MASK_THROW)) + +/* + * Coercion operations: in-place coercion, return coerced value where + * applicable. If index is invalid, throw error. Some coercions may + * throw an expected error (e.g. from a toString() or valueOf() call) + * or an internal error (e.g. from out of memory). + */ + +DUK_EXTERNAL_DECL void duk_to_undefined(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_to_null(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_bool_t duk_to_boolean(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_double_t duk_to_number(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_int_t duk_to_int(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_uint_t duk_to_uint(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_int32_t duk_to_int32(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_uint32_t duk_to_uint32(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_uint16_t duk_to_uint16(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_to_string(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_to_lstring(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len); +DUK_EXTERNAL_DECL void *duk_to_buffer_raw(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size, duk_uint_t flags); +DUK_EXTERNAL_DECL void *duk_to_pointer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_to_object(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_to_primitive(duk_context *ctx, duk_idx_t idx, duk_int_t hint); + +#define DUK_BUF_MODE_FIXED 0 /* internal: request fixed buffer result */ +#define DUK_BUF_MODE_DYNAMIC 1 /* internal: request dynamic buffer result */ +#define DUK_BUF_MODE_DONTCARE 2 /* internal: don't care about fixed/dynamic nature */ + +#define duk_to_buffer(ctx,idx,out_size) \ + duk_to_buffer_raw((ctx), (idx), (out_size), DUK_BUF_MODE_DONTCARE) +#define duk_to_fixed_buffer(ctx,idx,out_size) \ + duk_to_buffer_raw((ctx), (idx), (out_size), DUK_BUF_MODE_FIXED) +#define duk_to_dynamic_buffer(ctx,idx,out_size) \ + duk_to_buffer_raw((ctx), (idx), (out_size), DUK_BUF_MODE_DYNAMIC) + +/* safe variants of a few coercion operations */ +DUK_EXTERNAL_DECL const char *duk_safe_to_lstring(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len); +#define duk_safe_to_string(ctx,idx) \ + duk_safe_to_lstring((ctx), (idx), NULL) + +/* + * Value length + */ + +DUK_EXTERNAL_DECL duk_size_t duk_get_length(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_set_length(duk_context *ctx, duk_idx_t idx, duk_size_t len); +#if 0 +/* duk_require_length()? */ +/* duk_opt_length()? */ +#endif + +/* + * Misc conversion + */ + +DUK_EXTERNAL_DECL const char *duk_base64_encode(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_base64_decode(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_hex_encode(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_hex_decode(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL const char *duk_json_encode(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_json_decode(duk_context *ctx, duk_idx_t idx); + +DUK_EXTERNAL_DECL const char *duk_buffer_to_string(duk_context *ctx, duk_idx_t idx); + +/* + * Buffer + */ + +DUK_EXTERNAL_DECL void *duk_resize_buffer(duk_context *ctx, duk_idx_t idx, duk_size_t new_size); +DUK_EXTERNAL_DECL void *duk_steal_buffer(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size); +DUK_EXTERNAL_DECL void duk_config_buffer(duk_context *ctx, duk_idx_t idx, void *ptr, duk_size_t len); + +/* + * Property access + * + * The basic function assumes key is on stack. The _(l)string variant takes + * a C string as a property name; the _literal variant takes a C literal. + * The _index variant takes an array index as a property name (e.g. 123 is + * equivalent to the key "123"). The _heapptr variant takes a raw, borrowed + * heap pointer. + */ + +DUK_EXTERNAL_DECL duk_bool_t duk_get_prop(duk_context *ctx, duk_idx_t obj_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_get_prop_string(duk_context *ctx, duk_idx_t obj_idx, const char *key); +DUK_EXTERNAL_DECL duk_bool_t duk_get_prop_lstring(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#if defined(DUK_USE_PREFER_SIZE) +#define duk_get_prop_literal(ctx,obj_idx,key) duk_get_prop_string((ctx), (obj_idx), (key)) +#else +DUK_EXTERNAL_DECL duk_bool_t duk_get_prop_literal_raw(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#define duk_get_prop_literal(ctx,obj_idx,key) duk_get_prop_literal_raw((ctx), (obj_idx), (key), sizeof((key)) - 1U) +#endif +DUK_EXTERNAL_DECL duk_bool_t duk_get_prop_index(duk_context *ctx, duk_idx_t obj_idx, duk_uarridx_t arr_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_get_prop_heapptr(duk_context *ctx, duk_idx_t obj_idx, void *ptr); +DUK_EXTERNAL_DECL duk_bool_t duk_put_prop(duk_context *ctx, duk_idx_t obj_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_put_prop_string(duk_context *ctx, duk_idx_t obj_idx, const char *key); +DUK_EXTERNAL_DECL duk_bool_t duk_put_prop_lstring(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#if defined(DUK_USE_PREFER_SIZE) +#define duk_put_prop_literal(ctx,obj_idx,key) duk_put_prop_string((ctx), (obj_idx), (key)) +#else +DUK_EXTERNAL_DECL duk_bool_t duk_put_prop_literal_raw(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#define duk_put_prop_literal(ctx,obj_idx,key) duk_put_prop_literal_raw((ctx), (obj_idx), (key), sizeof((key)) - 1U) +#endif +DUK_EXTERNAL_DECL duk_bool_t duk_put_prop_index(duk_context *ctx, duk_idx_t obj_idx, duk_uarridx_t arr_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_put_prop_heapptr(duk_context *ctx, duk_idx_t obj_idx, void *ptr); +DUK_EXTERNAL_DECL duk_bool_t duk_del_prop(duk_context *ctx, duk_idx_t obj_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_del_prop_string(duk_context *ctx, duk_idx_t obj_idx, const char *key); +DUK_EXTERNAL_DECL duk_bool_t duk_del_prop_lstring(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#if defined(DUK_USE_PREFER_SIZE) +#define duk_del_prop_literal(ctx,obj_idx,key) duk_del_prop_string((ctx), (obj_idx), (key)) +#else +DUK_EXTERNAL_DECL duk_bool_t duk_del_prop_literal_raw(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#define duk_del_prop_literal(ctx,obj_idx,key) duk_del_prop_literal_raw((ctx), (obj_idx), (key), sizeof((key)) - 1U) +#endif +DUK_EXTERNAL_DECL duk_bool_t duk_del_prop_index(duk_context *ctx, duk_idx_t obj_idx, duk_uarridx_t arr_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_del_prop_heapptr(duk_context *ctx, duk_idx_t obj_idx, void *ptr); +DUK_EXTERNAL_DECL duk_bool_t duk_has_prop(duk_context *ctx, duk_idx_t obj_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_has_prop_string(duk_context *ctx, duk_idx_t obj_idx, const char *key); +DUK_EXTERNAL_DECL duk_bool_t duk_has_prop_lstring(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#if defined(DUK_USE_PREFER_SIZE) +#define duk_has_prop_literal(ctx,obj_idx,key) duk_has_prop_string((ctx), (obj_idx), (key)) +#else +DUK_EXTERNAL_DECL duk_bool_t duk_has_prop_literal_raw(duk_context *ctx, duk_idx_t obj_idx, const char *key, duk_size_t key_len); +#define duk_has_prop_literal(ctx,obj_idx,key) duk_has_prop_literal_raw((ctx), (obj_idx), (key), sizeof((key)) - 1U) +#endif +DUK_EXTERNAL_DECL duk_bool_t duk_has_prop_index(duk_context *ctx, duk_idx_t obj_idx, duk_uarridx_t arr_idx); +DUK_EXTERNAL_DECL duk_bool_t duk_has_prop_heapptr(duk_context *ctx, duk_idx_t obj_idx, void *ptr); + +DUK_EXTERNAL_DECL void duk_get_prop_desc(duk_context *ctx, duk_idx_t obj_idx, duk_uint_t flags); +DUK_EXTERNAL_DECL void duk_def_prop(duk_context *ctx, duk_idx_t obj_idx, duk_uint_t flags); + +DUK_EXTERNAL_DECL duk_bool_t duk_get_global_string(duk_context *ctx, const char *key); +DUK_EXTERNAL_DECL duk_bool_t duk_get_global_lstring(duk_context *ctx, const char *key, duk_size_t key_len); +#if defined(DUK_USE_PREFER_SIZE) +#define duk_get_global_literal(ctx,key) duk_get_global_string((ctx), (key)) +#else +DUK_EXTERNAL_DECL duk_bool_t duk_get_global_literal_raw(duk_context *ctx, const char *key, duk_size_t key_len); +#define duk_get_global_literal(ctx,key) duk_get_global_literal_raw((ctx), (key), sizeof((key)) - 1U) +#endif +DUK_EXTERNAL_DECL duk_bool_t duk_get_global_heapptr(duk_context *ctx, void *ptr); +DUK_EXTERNAL_DECL duk_bool_t duk_put_global_string(duk_context *ctx, const char *key); +DUK_EXTERNAL_DECL duk_bool_t duk_put_global_lstring(duk_context *ctx, const char *key, duk_size_t key_len); +#if defined(DUK_USE_PREFER_SIZE) +#define duk_put_global_literal(ctx,key) duk_put_global_string((ctx), (key)) +#else +DUK_EXTERNAL_DECL duk_bool_t duk_put_global_literal_raw(duk_context *ctx, const char *key, duk_size_t key_len); +#define duk_put_global_literal(ctx,key) duk_put_global_literal_raw((ctx), (key), sizeof((key)) - 1U) +#endif +DUK_EXTERNAL_DECL duk_bool_t duk_put_global_heapptr(duk_context *ctx, void *ptr); + +/* + * Inspection + */ + +DUK_EXTERNAL_DECL void duk_inspect_value(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_inspect_callstack_entry(duk_context *ctx, duk_int_t level); + +/* + * Object prototype + */ + +DUK_EXTERNAL_DECL void duk_get_prototype(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_set_prototype(duk_context *ctx, duk_idx_t idx); + +/* + * Object finalizer + */ + +DUK_EXTERNAL_DECL void duk_get_finalizer(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_set_finalizer(duk_context *ctx, duk_idx_t idx); + +/* + * Global object + */ + +DUK_EXTERNAL_DECL void duk_set_global_object(duk_context *ctx); + +/* + * Duktape/C function magic value + */ + +DUK_EXTERNAL_DECL duk_int_t duk_get_magic(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL void duk_set_magic(duk_context *ctx, duk_idx_t idx, duk_int_t magic); +DUK_EXTERNAL_DECL duk_int_t duk_get_current_magic(duk_context *ctx); + +/* + * Module helpers: put multiple function or constant properties + */ + +DUK_EXTERNAL_DECL void duk_put_function_list(duk_context *ctx, duk_idx_t obj_idx, const duk_function_list_entry *funcs); +DUK_EXTERNAL_DECL void duk_put_number_list(duk_context *ctx, duk_idx_t obj_idx, const duk_number_list_entry *numbers); + +/* + * Object operations + */ + +DUK_EXTERNAL_DECL void duk_compact(duk_context *ctx, duk_idx_t obj_idx); +DUK_EXTERNAL_DECL void duk_enum(duk_context *ctx, duk_idx_t obj_idx, duk_uint_t enum_flags); +DUK_EXTERNAL_DECL duk_bool_t duk_next(duk_context *ctx, duk_idx_t enum_idx, duk_bool_t get_value); +DUK_EXTERNAL_DECL void duk_seal(duk_context *ctx, duk_idx_t obj_idx); +DUK_EXTERNAL_DECL void duk_freeze(duk_context *ctx, duk_idx_t obj_idx); + +/* + * String manipulation + */ + +DUK_EXTERNAL_DECL void duk_concat(duk_context *ctx, duk_idx_t count); +DUK_EXTERNAL_DECL void duk_join(duk_context *ctx, duk_idx_t count); +DUK_EXTERNAL_DECL void duk_decode_string(duk_context *ctx, duk_idx_t idx, duk_decode_char_function callback, void *udata); +DUK_EXTERNAL_DECL void duk_map_string(duk_context *ctx, duk_idx_t idx, duk_map_char_function callback, void *udata); +DUK_EXTERNAL_DECL void duk_substring(duk_context *ctx, duk_idx_t idx, duk_size_t start_char_offset, duk_size_t end_char_offset); +DUK_EXTERNAL_DECL void duk_trim(duk_context *ctx, duk_idx_t idx); +DUK_EXTERNAL_DECL duk_codepoint_t duk_char_code_at(duk_context *ctx, duk_idx_t idx, duk_size_t char_offset); + +/* + * ECMAScript operators + */ + +DUK_EXTERNAL_DECL duk_bool_t duk_equals(duk_context *ctx, duk_idx_t idx1, duk_idx_t idx2); +DUK_EXTERNAL_DECL duk_bool_t duk_strict_equals(duk_context *ctx, duk_idx_t idx1, duk_idx_t idx2); +DUK_EXTERNAL_DECL duk_bool_t duk_samevalue(duk_context *ctx, duk_idx_t idx1, duk_idx_t idx2); +DUK_EXTERNAL_DECL duk_bool_t duk_instanceof(duk_context *ctx, duk_idx_t idx1, duk_idx_t idx2); + +/* + * Random + */ + +DUK_EXTERNAL_DECL duk_double_t duk_random(duk_context *ctx); + +/* + * Function (method) calls + */ + +DUK_EXTERNAL_DECL void duk_call(duk_context *ctx, duk_idx_t nargs); +DUK_EXTERNAL_DECL void duk_call_method(duk_context *ctx, duk_idx_t nargs); +DUK_EXTERNAL_DECL void duk_call_prop(duk_context *ctx, duk_idx_t obj_idx, duk_idx_t nargs); +DUK_EXTERNAL_DECL duk_int_t duk_pcall(duk_context *ctx, duk_idx_t nargs); +DUK_EXTERNAL_DECL duk_int_t duk_pcall_method(duk_context *ctx, duk_idx_t nargs); +DUK_EXTERNAL_DECL duk_int_t duk_pcall_prop(duk_context *ctx, duk_idx_t obj_idx, duk_idx_t nargs); +DUK_EXTERNAL_DECL void duk_new(duk_context *ctx, duk_idx_t nargs); +DUK_EXTERNAL_DECL duk_int_t duk_pnew(duk_context *ctx, duk_idx_t nargs); +DUK_EXTERNAL_DECL duk_int_t duk_safe_call(duk_context *ctx, duk_safe_call_function func, void *udata, duk_idx_t nargs, duk_idx_t nrets); + +/* + * Thread management + */ + +/* There are currently no native functions to yield/resume, due to the internal + * limitations on coroutine handling. These will be added later. + */ + +/* + * Compilation and evaluation + */ + +DUK_EXTERNAL_DECL duk_int_t duk_eval_raw(duk_context *ctx, const char *src_buffer, duk_size_t src_length, duk_uint_t flags); +DUK_EXTERNAL_DECL duk_int_t duk_compile_raw(duk_context *ctx, const char *src_buffer, duk_size_t src_length, duk_uint_t flags); + +/* plain */ +#define duk_eval(ctx) \ + ((void) duk_eval_raw((ctx), NULL, 0, 1 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NOFILENAME)) + +#define duk_eval_noresult(ctx) \ + ((void) duk_eval_raw((ctx), NULL, 0, 1 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NORESULT | DUK_COMPILE_NOFILENAME)) + +#define duk_peval(ctx) \ + (duk_eval_raw((ctx), NULL, 0, 1 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_SAFE | DUK_COMPILE_NOFILENAME)) + +#define duk_peval_noresult(ctx) \ + (duk_eval_raw((ctx), NULL, 0, 1 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_SAFE | DUK_COMPILE_NORESULT | DUK_COMPILE_NOFILENAME)) + +#define duk_compile(ctx,flags) \ + ((void) duk_compile_raw((ctx), NULL, 0, 2 /*args*/ | (flags))) + +#define duk_pcompile(ctx,flags) \ + (duk_compile_raw((ctx), NULL, 0, 2 /*args*/ | (flags) | DUK_COMPILE_SAFE)) + +/* string */ +#define duk_eval_string(ctx,src) \ + ((void) duk_eval_raw((ctx), (src), 0, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN | DUK_COMPILE_NOFILENAME)) + +#define duk_eval_string_noresult(ctx,src) \ + ((void) duk_eval_raw((ctx), (src), 0, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN | DUK_COMPILE_NORESULT | DUK_COMPILE_NOFILENAME)) + +#define duk_peval_string(ctx,src) \ + (duk_eval_raw((ctx), (src), 0, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN | DUK_COMPILE_NOFILENAME)) + +#define duk_peval_string_noresult(ctx,src) \ + (duk_eval_raw((ctx), (src), 0, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN | DUK_COMPILE_NORESULT | DUK_COMPILE_NOFILENAME)) + +#define duk_compile_string(ctx,flags,src) \ + ((void) duk_compile_raw((ctx), (src), 0, 0 /*args*/ | (flags) | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN | DUK_COMPILE_NOFILENAME)) + +#define duk_compile_string_filename(ctx,flags,src) \ + ((void) duk_compile_raw((ctx), (src), 0, 1 /*args*/ | (flags) | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN)) + +#define duk_pcompile_string(ctx,flags,src) \ + (duk_compile_raw((ctx), (src), 0, 0 /*args*/ | (flags) | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN | DUK_COMPILE_NOFILENAME)) + +#define duk_pcompile_string_filename(ctx,flags,src) \ + (duk_compile_raw((ctx), (src), 0, 1 /*args*/ | (flags) | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE | DUK_COMPILE_STRLEN)) + +/* lstring */ +#define duk_eval_lstring(ctx,buf,len) \ + ((void) duk_eval_raw((ctx), buf, len, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NOSOURCE | DUK_COMPILE_NOFILENAME)) + +#define duk_eval_lstring_noresult(ctx,buf,len) \ + ((void) duk_eval_raw((ctx), buf, len, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NOSOURCE | DUK_COMPILE_NORESULT | DUK_COMPILE_NOFILENAME)) + +#define duk_peval_lstring(ctx,buf,len) \ + (duk_eval_raw((ctx), buf, len, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_NOSOURCE | DUK_COMPILE_SAFE | DUK_COMPILE_NOFILENAME)) + +#define duk_peval_lstring_noresult(ctx,buf,len) \ + (duk_eval_raw((ctx), buf, len, 0 /*args*/ | DUK_COMPILE_EVAL | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE | DUK_COMPILE_NORESULT | DUK_COMPILE_NOFILENAME)) + +#define duk_compile_lstring(ctx,flags,buf,len) \ + ((void) duk_compile_raw((ctx), buf, len, 0 /*args*/ | (flags) | DUK_COMPILE_NOSOURCE | DUK_COMPILE_NOFILENAME)) + +#define duk_compile_lstring_filename(ctx,flags,buf,len) \ + ((void) duk_compile_raw((ctx), buf, len, 1 /*args*/ | (flags) | DUK_COMPILE_NOSOURCE)) + +#define duk_pcompile_lstring(ctx,flags,buf,len) \ + (duk_compile_raw((ctx), buf, len, 0 /*args*/ | (flags) | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE | DUK_COMPILE_NOFILENAME)) + +#define duk_pcompile_lstring_filename(ctx,flags,buf,len) \ + (duk_compile_raw((ctx), buf, len, 1 /*args*/ | (flags) | DUK_COMPILE_SAFE | DUK_COMPILE_NOSOURCE)) + +/* + * Bytecode load/dump + */ + +DUK_EXTERNAL_DECL void duk_dump_function(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_load_function(duk_context *ctx); + +/* + * Debugging + */ + +DUK_EXTERNAL_DECL void duk_push_context_dump(duk_context *ctx); + +/* + * Debugger (debug protocol) + */ + +DUK_EXTERNAL_DECL void duk_debugger_attach(duk_context *ctx, + duk_debug_read_function read_cb, + duk_debug_write_function write_cb, + duk_debug_peek_function peek_cb, + duk_debug_read_flush_function read_flush_cb, + duk_debug_write_flush_function write_flush_cb, + duk_debug_request_function request_cb, + duk_debug_detached_function detached_cb, + void *udata); +DUK_EXTERNAL_DECL void duk_debugger_detach(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_debugger_cooperate(duk_context *ctx); +DUK_EXTERNAL_DECL duk_bool_t duk_debugger_notify(duk_context *ctx, duk_idx_t nvalues); +DUK_EXTERNAL_DECL void duk_debugger_pause(duk_context *ctx); + +/* + * Time handling + */ + +DUK_EXTERNAL_DECL duk_double_t duk_get_now(duk_context *ctx); +DUK_EXTERNAL_DECL void duk_time_to_components(duk_context *ctx, duk_double_t timeval, duk_time_components *comp); +DUK_EXTERNAL_DECL duk_double_t duk_components_to_time(duk_context *ctx, duk_time_components *comp); + +/* + * Date provider related constants + * + * NOTE: These are "semi public" - you should only use these if you write + * your own platform specific Date provider, see doc/datetime.rst. + */ + +/* Millisecond count constants. */ +#define DUK_DATE_MSEC_SECOND 1000L +#define DUK_DATE_MSEC_MINUTE (60L * 1000L) +#define DUK_DATE_MSEC_HOUR (60L * 60L * 1000L) +#define DUK_DATE_MSEC_DAY (24L * 60L * 60L * 1000L) + +/* ECMAScript date range is 100 million days from Epoch: + * > 100e6 * 24 * 60 * 60 * 1000 // 100M days in millisecs + * 8640000000000000 + * (= 8.64e15) + */ +#define DUK_DATE_MSEC_100M_DAYS (8.64e15) +#define DUK_DATE_MSEC_100M_DAYS_LEEWAY (8.64e15 + 24 * 3600e3) + +/* ECMAScript year range: + * > new Date(100e6 * 24 * 3600e3).toISOString() + * '+275760-09-13T00:00:00.000Z' + * > new Date(-100e6 * 24 * 3600e3).toISOString() + * '-271821-04-20T00:00:00.000Z' + */ +#define DUK_DATE_MIN_ECMA_YEAR (-271821L) +#define DUK_DATE_MAX_ECMA_YEAR 275760L + +/* Part indices for internal breakdowns. Part order from DUK_DATE_IDX_YEAR + * to DUK_DATE_IDX_MILLISECOND matches argument ordering of ECMAScript API + * calls (like Date constructor call). Some functions in duk_bi_date.c + * depend on the specific ordering, so change with care. 16 bits are not + * enough for all parts (year, specifically). + * + * Must be in-sync with genbuiltins.py. + */ +#define DUK_DATE_IDX_YEAR 0 /* year */ +#define DUK_DATE_IDX_MONTH 1 /* month: 0 to 11 */ +#define DUK_DATE_IDX_DAY 2 /* day within month: 0 to 30 */ +#define DUK_DATE_IDX_HOUR 3 +#define DUK_DATE_IDX_MINUTE 4 +#define DUK_DATE_IDX_SECOND 5 +#define DUK_DATE_IDX_MILLISECOND 6 +#define DUK_DATE_IDX_WEEKDAY 7 /* weekday: 0 to 6, 0=sunday, 1=monday, etc */ +#define DUK_DATE_IDX_NUM_PARTS 8 + +/* Internal API call flags, used for various functions in duk_bi_date.c. + * Certain flags are used by only certain functions, but since the flags + * don't overlap, a single flags value can be passed around to multiple + * functions. + * + * The unused top bits of the flags field are also used to pass values + * to helpers (duk__get_part_helper() and duk__set_part_helper()). + * + * Must be in-sync with genbuiltins.py. + */ + +/* NOTE: when writing a Date provider you only need a few specific + * flags from here, the rest are internal. Avoid using anything you + * don't need. + */ + +#define DUK_DATE_FLAG_NAN_TO_ZERO (1 << 0) /* timeval breakdown: internal time value NaN -> zero */ +#define DUK_DATE_FLAG_NAN_TO_RANGE_ERROR (1 << 1) /* timeval breakdown: internal time value NaN -> RangeError (toISOString) */ +#define DUK_DATE_FLAG_ONEBASED (1 << 2) /* timeval breakdown: convert month and day-of-month parts to one-based (default is zero-based) */ +#define DUK_DATE_FLAG_EQUIVYEAR (1 << 3) /* timeval breakdown: replace year with equivalent year in the [1971,2037] range for DST calculations */ +#define DUK_DATE_FLAG_LOCALTIME (1 << 4) /* convert time value to local time */ +#define DUK_DATE_FLAG_SUB1900 (1 << 5) /* getter: subtract 1900 from year when getting year part */ +#define DUK_DATE_FLAG_TOSTRING_DATE (1 << 6) /* include date part in string conversion result */ +#define DUK_DATE_FLAG_TOSTRING_TIME (1 << 7) /* include time part in string conversion result */ +#define DUK_DATE_FLAG_TOSTRING_LOCALE (1 << 8) /* use locale specific formatting if available */ +#define DUK_DATE_FLAG_TIMESETTER (1 << 9) /* setter: call is a time setter (affects hour, min, sec, ms); otherwise date setter (affects year, month, day-in-month) */ +#define DUK_DATE_FLAG_YEAR_FIXUP (1 << 10) /* setter: perform 2-digit year fixup (00...99 -> 1900...1999) */ +#define DUK_DATE_FLAG_SEP_T (1 << 11) /* string conversion: use 'T' instead of ' ' as a separator */ +#define DUK_DATE_FLAG_VALUE_SHIFT 12 /* additional values begin at bit 12 */ + +/* + * ROM pointer compression + */ + +/* Support array for ROM pointer compression. Only declared when ROM + * pointer compression is active. + */ +#if defined(DUK_USE_ROM_OBJECTS) && defined(DUK_USE_HEAPPTR16) +DUK_EXTERNAL_DECL const void * const duk_rom_compressed_pointers[]; +#endif + +/* + * C++ name mangling + */ + +#if defined(__cplusplus) +/* end 'extern "C"' wrapper */ +} +#endif + +/* + * END PUBLIC API + */ + +#endif /* DUKTAPE_H_INCLUDED */ diff --git a/src/main-afb-daemon.c b/src/main-afb-daemon.c index 165d1400..2b61bd8e 100644 --- a/src/main-afb-daemon.c +++ b/src/main-afb-daemon.c @@ -47,6 +47,7 @@ # include "afb-api-dbus.h" #endif #include "afb-api-ws.h" +#include "afb-api-js.h" #include "afb-hsrv.h" #include "afb-hreq.h" #include "afb-xreq.h" @@ -854,6 +855,7 @@ static void start(int signum, void *arg) apiset_start_list("weak-ldpaths", afb_api_so_add_pathset_nofails, "the weak binding path set"); #endif apiset_start_list("auto-api", afb_autoset_add_any, "the automatic api path set"); + apiset_start_list("jsapi", afb_api_js_add, "the jsapi"); #if WITH_DBUS_TRANSPARENCY apiset_start_list("dbus-client", afb_api_dbus_add_client, "the afb-dbus client"); #endif |