# 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 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 = 'wasm' 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 = env.coredata.compiler_options[self.for_machine]['{}_thread_count'.format(self.language)].value # type: int if count: args.extend(['-s', 'PTHREAD_POOL_SIZE={}'.format(count)]) return args def get_options(self) -> 'coredata.OptionDictType': opts = super().get_options() opts.update({ '{}_thread_count'.format(self.language): 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