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# Copyright 2019 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.
"""Provides a mixin for shared code between C and C++ Emscripten compilers."""
import os.path
import typing as T
from ... import coredata
from ...mesonlib import OptionKey
if T.TYPE_CHECKING:
from ...environment import Environment
from ...compilers.compilers import Compiler
else:
# This is a bit clever, for mypy we pretend that these mixins descend from
# Compiler, so we get all of the methods and attributes defined for us, but
# for runtime we make them descend from object (which all classes normally
# do). This gives up DRYer type checking, with no runtime impact
Compiler = object
class EmscriptenMixin(Compiler):
def _get_compile_output(self, dirname: str, mode: str) -> str:
# In pre-processor mode, the output is sent to stdout and discarded
if mode == 'preprocess':
return None
# Unlike sane toolchains, emcc infers the kind of output from its name.
# This is the only reason why this method is overridden; compiler tests
# do not work well with the default exe/obj suffices.
if mode == 'link':
suffix = 'js'
else:
suffix = 'o'
return os.path.join(dirname, 'output.' + suffix)
def thread_flags(self, env: 'Environment') -> T.List[str]:
return ['-s', 'USE_PTHREADS=1']
def thread_link_flags(self, env: 'Environment') -> T.List[str]:
args = ['-s', 'USE_PTHREADS=1']
count: int = env.coredata.options[OptionKey('thread_count', lang=self.language, machine=self.for_machine)].value
if count:
args.extend(['-s', f'PTHREAD_POOL_SIZE={count}'])
return args
def get_options(self) -> 'coredata.KeyedOptionDictType':
opts = super().get_options()
key = OptionKey('thread_count', machine=self.for_machine, lang=self.language)
opts.update({
key: coredata.UserIntegerOption(
'Number of threads to use in web assembly, set to 0 to disable',
(0, None, 4), # Default was picked at random
),
})
return opts
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