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# Copyright 2020 The Meson development team
# 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.
import pathlib
import pickle
import re
import os
import sys
import typing as T
from ..backend.ninjabackend import TargetDependencyScannerInfo, ninja_quote
from ..compilers.compilers import lang_suffixes
CPP_IMPORT_RE = re.compile(r'\w*import ([a-zA-Z0-9]+);')
CPP_EXPORT_RE = re.compile(r'\w*export module ([a-zA-Z0-9]+);')
FORTRAN_INCLUDE_PAT = r"^\s*include\s*['\"](\w+\.\w+)['\"]"
FORTRAN_MODULE_PAT = r"^\s*\bmodule\b\s+(\w+)\s*(?:!+.*)*$"
FORTRAN_SUBMOD_PAT = r"^\s*\bsubmodule\b\s*\((\w+:?\w+)\)\s*(\w+)"
FORTRAN_USE_PAT = r"^\s*use,?\s*(?:non_intrinsic)?\s*(?:::)?\s*(\w+)"
FORTRAN_MODULE_RE = re.compile(FORTRAN_MODULE_PAT, re.IGNORECASE)
FORTRAN_SUBMOD_RE = re.compile(FORTRAN_SUBMOD_PAT, re.IGNORECASE)
FORTRAN_USE_RE = re.compile(FORTRAN_USE_PAT, re.IGNORECASE)
class DependencyScanner:
def __init__(self, pickle_file: str, outfile: str, sources: T.List[str]):
with open(pickle_file, 'rb') as pf:
self.target_data = pickle.load(pf) # type: TargetDependencyScannerInfo
self.outfile = outfile
self.sources = sources
self.provided_by = {} # type: T.Dict[str, str]
self.exports = {} # type: T.Dict[str, str]
self.needs = {} # type: T.Dict[str, T.List[str]]
self.sources_with_exports = [] # type: T.List[str]
def scan_file(self, fname: str) -> None:
suffix = os.path.splitext(fname)[1][1:].lower()
if suffix in lang_suffixes['fortran']:
self.scan_fortran_file(fname)
elif suffix in lang_suffixes['cpp']:
self.scan_cpp_file(fname)
else:
sys.exit(f'Can not scan files with suffix .{suffix}.')
def scan_fortran_file(self, fname: str) -> None:
fpath = pathlib.Path(fname)
modules_in_this_file = set()
for line in fpath.read_text(encoding='utf-8').split('\n'):
import_match = FORTRAN_USE_RE.match(line)
export_match = FORTRAN_MODULE_RE.match(line)
submodule_export_match = FORTRAN_SUBMOD_RE.match(line)
if import_match:
needed = import_match.group(1).lower()
# In Fortran you have an using declaration also for the module
# you define in the same file. Prevent circular dependencies.
if needed not in modules_in_this_file:
if fname in self.needs:
self.needs[fname].append(needed)
else:
self.needs[fname] = [needed]
if export_match:
exported_module = export_match.group(1).lower()
assert(exported_module not in modules_in_this_file)
modules_in_this_file.add(exported_module)
if exported_module in self.provided_by:
raise RuntimeError(f'Multiple files provide module {exported_module}.')
self.sources_with_exports.append(fname)
self.provided_by[exported_module] = fname
self.exports[fname] = exported_module
if submodule_export_match:
# Store submodule "Foo" "Bar" as "foo:bar".
# A submodule declaration can be both an import and an export declaration:
#
# submodule (a1:a2) a3
# - requires a1@a2.smod
# - produces a1@a3.smod
parent_module_name_full = submodule_export_match.group(1).lower()
parent_module_name = parent_module_name_full.split(':')[0]
submodule_name = submodule_export_match.group(2).lower()
concat_name = f'{parent_module_name}:{submodule_name}'
self.sources_with_exports.append(fname)
self.provided_by[concat_name] = fname
self.exports[fname] = concat_name
# Fortran requires that the immediate parent module must be built
# before the current one. Thus:
#
# submodule (parent) parent <- requires parent.mod (really parent.smod, but they are created at the same time)
# submodule (a1:a2) a3 <- requires a1@a2.smod
#
# a3 does not depend on the a1 parent module directly, only transitively.
if fname in self.needs:
self.needs[fname].append(parent_module_name_full)
else:
self.needs[fname] = [parent_module_name_full]
def scan_cpp_file(self, fname: str) -> None:
fpath = pathlib.Path(fname)
for line in fpath.read_text(encoding='utf-8').split('\n'):
import_match = CPP_IMPORT_RE.match(line)
export_match = CPP_EXPORT_RE.match(line)
if import_match:
needed = import_match.group(1)
if fname in self.needs:
self.needs[fname].append(needed)
else:
self.needs[fname] = [needed]
if export_match:
exported_module = export_match.group(1)
if exported_module in self.provided_by:
raise RuntimeError(f'Multiple files provide module {exported_module}.')
self.sources_with_exports.append(fname)
self.provided_by[exported_module] = fname
self.exports[fname] = exported_module
def objname_for(self, src: str) -> str:
objname = self.target_data.source2object[src]
assert(isinstance(objname, str))
return objname
def module_name_for(self, src: str) -> str:
suffix = os.path.splitext(src)[1][1:].lower()
if suffix in lang_suffixes['fortran']:
exported = self.exports[src]
# Module foo:bar goes to a file name foo@bar.smod
# Module Foo goes to a file name foo.mod
namebase = exported.replace(':', '@')
if ':' in exported:
extension = 'smod'
else:
extension = 'mod'
return os.path.join(self.target_data.private_dir, f'{namebase}.{extension}')
elif suffix in lang_suffixes['cpp']:
return '{}.ifc'.format(self.exports[src])
else:
raise RuntimeError('Unreachable code.')
def scan(self) -> int:
for s in self.sources:
self.scan_file(s)
with open(self.outfile, 'w', encoding='utf-8') as ofile:
ofile.write('ninja_dyndep_version = 1\n')
for src in self.sources:
objfilename = self.objname_for(src)
mods_and_submods_needed = []
module_files_generated = []
module_files_needed = []
if src in self.sources_with_exports:
module_files_generated.append(self.module_name_for(src))
if src in self.needs:
for modname in self.needs[src]:
if modname not in self.provided_by:
# Nothing provides this module, we assume that it
# comes from a dependency library somewhere and is
# already built by the time this compilation starts.
pass
else:
mods_and_submods_needed.append(modname)
for modname in mods_and_submods_needed:
provider_src = self.provided_by[modname]
provider_modfile = self.module_name_for(provider_src)
# Prune self-dependencies
if provider_src != src:
module_files_needed.append(provider_modfile)
quoted_objfilename = ninja_quote(objfilename, True)
quoted_module_files_generated = [ninja_quote(x, True) for x in module_files_generated]
quoted_module_files_needed = [ninja_quote(x, True) for x in module_files_needed]
if quoted_module_files_generated:
mod_gen = '| ' + ' '.join(quoted_module_files_generated)
else:
mod_gen = ''
if quoted_module_files_needed:
mod_dep = '| ' + ' '.join(quoted_module_files_needed)
else:
mod_dep = ''
build_line = 'build {} {}: dyndep {}'.format(quoted_objfilename,
mod_gen,
mod_dep)
ofile.write(build_line + '\n')
return 0
def run(args: T.List[str]) -> int:
pickle_file = args[0]
outfile = args[1]
sources = args[2:]
scanner = DependencyScanner(pickle_file, outfile, sources)
return scanner.scan()
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