diff options
Diffstat (limited to 'mesonbuild/dependencies/cuda.py')
| -rw-r--r-- | mesonbuild/dependencies/cuda.py | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/mesonbuild/dependencies/cuda.py b/mesonbuild/dependencies/cuda.py new file mode 100644 index 0000000..67b361f --- /dev/null +++ b/mesonbuild/dependencies/cuda.py @@ -0,0 +1,253 @@ +# Copyright 2013-2019 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. + +import glob +import re +import os + +from .. import mlog +from .. import mesonlib +from ..environment import detect_cpu_family + +from .base import (DependencyException, ExternalDependency, HasNativeKwarg) + + +class CudaDependency(ExternalDependency): + + supported_languages = ['cuda', 'cpp', 'c'] # see also _default_language + + def __init__(self, environment, kwargs): + HasNativeKwarg.__init__(self, kwargs) # initialize self.for_machine + compilers = environment.coredata.compilers[self.for_machine] + language = self._detect_language(compilers) + if language not in self.supported_languages: + raise DependencyException('Language \'{}\' is not supported by the CUDA Toolkit. Supported languages are {}.'.format(language, self.supported_languages)) + + super().__init__('cuda', environment, language, kwargs) + self.requested_modules = self.get_requested(kwargs) + if 'cudart' not in self.requested_modules: + self.requested_modules = ['cudart'] + self.requested_modules + + (self.cuda_path, self.version, self.is_found) = self._detect_cuda_path_and_version() + if not self.is_found: + return + + if not os.path.isabs(self.cuda_path): + raise DependencyException('CUDA Toolkit path must be absolute, got \'{}\'.'.format(self.cuda_path)) + + # nvcc already knows where to find the CUDA Toolkit, but if we're compiling + # a mixed C/C++/CUDA project, we still need to make the include dir searchable + if self.language != 'cuda' or len(compilers) > 1: + self.incdir = os.path.join(self.cuda_path, 'include') + self.compile_args += ['-I{}'.format(self.incdir)] + + if self.language != 'cuda': + arch_libdir = self._detect_arch_libdir() + self.libdir = os.path.join(self.cuda_path, arch_libdir) + mlog.debug('CUDA library directory is', mlog.bold(self.libdir)) + else: + self.libdir = None + + self.is_found = self._find_requested_libraries() + + @classmethod + def _detect_language(cls, compilers): + for lang in cls.supported_languages: + if lang in compilers: + return lang + return list(compilers.keys())[0] + + def _detect_cuda_path_and_version(self): + self.env_var = self._default_path_env_var() + mlog.debug('Default path env var:', mlog.bold(self.env_var)) + + version_reqs = self.version_reqs + if self.language == 'cuda': + nvcc_version = self._strip_patch_version(self.get_compiler().version) + mlog.debug('nvcc version:', mlog.bold(nvcc_version)) + if version_reqs: + # make sure nvcc version satisfies specified version requirements + (found_some, not_found, found) = mesonlib.version_compare_many(nvcc_version, version_reqs) + if not_found: + msg = 'The current nvcc version {} does not satisfy the specified CUDA Toolkit version requirements {}.'.format(nvcc_version, version_reqs) + return self._report_dependency_error(msg, (None, None, False)) + + # use nvcc version to find a matching CUDA Toolkit + version_reqs = ['={}'.format(nvcc_version)] + else: + nvcc_version = None + + paths = [(path, self._cuda_toolkit_version(path), default) for (path, default) in self._cuda_paths()] + if version_reqs: + return self._find_matching_toolkit(paths, version_reqs, nvcc_version) + + defaults = [(path, version) for (path, version, default) in paths if default] + if defaults: + return (*defaults[0], True) + + platform_msg = 'set the CUDA_PATH environment variable' if self._is_windows() \ + else 'set the CUDA_PATH environment variable/create the \'/usr/local/cuda\' symbolic link' + msg = 'Please specify the desired CUDA Toolkit version (e.g. dependency(\'cuda\', version : \'>=10.1\')) or {} to point to the location of your desired version.'.format(platform_msg) + return self._report_dependency_error(msg, (None, None, False)) + + def _find_matching_toolkit(self, paths, version_reqs, nvcc_version): + # keep the default paths order intact, sort the rest in the descending order + # according to the toolkit version + defaults, rest = mesonlib.partition(lambda t: not t[2], paths) + defaults = list(defaults) + paths = defaults + sorted(rest, key=lambda t: mesonlib.Version(t[1]), reverse=True) + mlog.debug('Search paths: {}'.format(paths)) + + if nvcc_version and defaults: + default_src = "the {} environment variable".format(self.env_var) if self.env_var else "the \'/usr/local/cuda\' symbolic link" + nvcc_warning = 'The default CUDA Toolkit as designated by {} ({}) doesn\'t match the current nvcc version {} and will be ignored.'.format(default_src, os.path.realpath(defaults[0][0]), nvcc_version) + else: + nvcc_warning = None + + for (path, version, default) in paths: + (found_some, not_found, found) = mesonlib.version_compare_many(version, version_reqs) + if not not_found: + if not default and nvcc_warning: + mlog.warning(nvcc_warning) + return (path, version, True) + + if nvcc_warning: + mlog.warning(nvcc_warning) + return (None, None, False) + + def _default_path_env_var(self): + env_vars = ['CUDA_PATH'] if self._is_windows() else ['CUDA_PATH', 'CUDA_HOME', 'CUDA_ROOT'] + env_vars = [var for var in env_vars if var in os.environ] + user_defaults = set([os.environ[var] for var in env_vars]) + if len(user_defaults) > 1: + mlog.warning('Environment variables {} point to conflicting toolkit locations ({}). Toolkit selection might produce unexpected results.'.format(', '.join(env_vars), ', '.join(user_defaults))) + return env_vars[0] if env_vars else None + + def _cuda_paths(self): + return ([(os.environ[self.env_var], True)] if self.env_var else []) \ + + (self._cuda_paths_win() if self._is_windows() else self._cuda_paths_nix()) + + def _cuda_paths_win(self): + env_vars = os.environ.keys() + return [(os.environ[var], False) for var in env_vars if var.startswith('CUDA_PATH_')] + + def _cuda_paths_nix(self): + # include /usr/local/cuda default only if no env_var was found + pattern = '/usr/local/cuda-*' if self.env_var else '/usr/local/cuda*' + return [(path, os.path.basename(path) == 'cuda') for path in glob.iglob(pattern)] + + toolkit_version_regex = re.compile(r'^CUDA Version\s+(.*)$') + path_version_win_regex = re.compile(r'^v(.*)$') + path_version_nix_regex = re.compile(r'^cuda-(.*)$') + + def _cuda_toolkit_version(self, path): + version = self._read_toolkit_version_txt(path) + if version: + return version + + mlog.debug('Falling back to extracting version from path') + path_version_regex = self.path_version_win_regex if self._is_windows() else self.path_version_nix_regex + m = path_version_regex.match(os.path.basename(path)) + if m: + return m[1] + + mlog.warning('Could not detect CUDA Toolkit version for {}'.format(path)) + return '0.0' + + def _read_toolkit_version_txt(self, path): + # Read 'version.txt' at the root of the CUDA Toolkit directory to determine the tookit version + version_file_path = os.path.join(path, 'version.txt') + try: + with open(version_file_path) as version_file: + version_str = version_file.readline() # e.g. 'CUDA Version 10.1.168' + m = self.toolkit_version_regex.match(version_str) + if m: + return self._strip_patch_version(m[1]) + except Exception as e: + mlog.debug('Could not read CUDA Toolkit\'s version file {}: {}'.format(version_file_path, str(e))) + + return None + + @classmethod + def _strip_patch_version(cls, version): + return '.'.join(version.split('.')[:2]) + + def _detect_arch_libdir(self): + arch = detect_cpu_family(self.env.coredata.compilers.host) + machine = self.env.machines[self.for_machine] + msg = '{} architecture is not supported in {} version of the CUDA Toolkit.' + if machine.is_windows(): + libdirs = {'x86': 'Win32', 'x86_64': 'x64'} + if arch not in libdirs: + raise DependencyException(msg.format(arch, 'Windows')) + return os.path.join('lib', libdirs[arch]) + elif machine.is_linux(): + libdirs = {'x86_64': 'lib64', 'ppc64': 'lib'} + if arch not in libdirs: + raise DependencyException(msg.format(arch, 'Linux')) + return libdirs[arch] + elif machine.is_osx(): + libdirs = {'x86_64': 'lib64'} + if arch not in libdirs: + raise DependencyException(msg.format(arch, 'macOS')) + return libdirs[arch] + else: + raise DependencyException('CUDA Toolkit: unsupported platform.') + + def _find_requested_libraries(self): + self.lib_modules = {} + all_found = True + + for module in self.requested_modules: + args = self.clib_compiler.find_library(module, self.env, [self.libdir] if self.libdir else []) + if args is None: + self._report_dependency_error('Couldn\'t find requested CUDA module \'{}\''.format(module)) + all_found = False + else: + mlog.debug('Link args for CUDA module \'{}\' are {}'.format(module, args)) + self.lib_modules[module] = args + + return all_found + + def _is_windows(self): + return self.env.machines[self.for_machine].is_windows() + + def _report_dependency_error(self, msg, ret_val=None): + if self.required: + raise DependencyException(msg) + + mlog.debug(msg) + return ret_val + + def log_details(self): + module_str = ', '.join(self.requested_modules) + return 'modules: ' + module_str + + def log_info(self): + return self.cuda_path if self.cuda_path else '' + + def get_requested(self, kwargs): + candidates = mesonlib.extract_as_list(kwargs, 'modules') + for c in candidates: + if not isinstance(c, str): + raise DependencyException('CUDA module argument is not a string.') + return candidates + + def get_link_args(self, **kwargs): + args = [] + if self.libdir: + args += self.clib_compiler.get_linker_search_args(self.libdir) + for lib in self.requested_modules: + args += self.lib_modules[lib] + return args |