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# Copyright 2016 The Cobalt Authors. All Rights Reserved.
# 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
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
"""Build related constants and helper functions."""
import imp
import importlib
import logging
import os
import sys
import _env # pylint: disable=unused-import
from import config
from import paths
from import platform
from import download_clang
_STARBOARD_TOOLCHAINS_DIR_NAME = 'starboard-toolchains'
# TODO: Rectify consistency of "Build Type" / "Build Config" naming.
class ClangSpecification(object):
"""A specific version of Clang."""
def __init__(self, revision, version):
assert revision
assert version
self.revision = revision
self.version = version
def _CheckConfig(key, raw_value, value):
if config.IsValid(value):
return True
logging.warning("Environment variable '%s' is '%s', which is invalid.", key,
logging.warning('Valid build configurations: %s', config.GetAll())
return False
def _CheckPlatform(key, raw_value, value):
if platform.IsValid(value):
return True
logging.warning("Environment variable '%s' is '%s', which is invalid.", key,
logging.warning('Valid platforms: %s', platform.GetAll())
return False
def GetDefaultConfigAndPlatform():
"""Returns a (config_name, platform_name) tuple based on the environment."""
default_config_name = None
default_platform_name = None
if _BUILD_CONFIG_KEY in os.environ:
raw_config_name = os.environ[_BUILD_CONFIG_KEY]
config_name = raw_config_name.lower()
if _CheckConfig(_BUILD_CONFIG_KEY, raw_config_name, config_name):
default_config_name = config_name
if _BUILD_PLATFORM_KEY in os.environ:
raw_platform_name = os.environ[_BUILD_PLATFORM_KEY]
platform_name = raw_platform_name.lower()
if _CheckPlatform(_BUILD_PLATFORM_KEY, raw_platform_name, platform_name):
default_platform_name = platform_name
if default_config_name and default_platform_name:
return default_config_name, default_platform_name
# Only check BUILD_CONFIGURATION if either platform or config is not
# provided individually, or at least one is invalid.
if _BUILD_CONFIGURATION_KEY not in os.environ:
return default_config_name, default_platform_name
raw_configuration = os.environ[_BUILD_CONFIGURATION_KEY]
build_configuration = raw_configuration.lower()
if '_' not in build_configuration:
"Expected a '_' in '%s' and did not find one. "
"'%s' must be of the form <platform>_<config>.",
return default_config_name, default_platform_name
platform_name, config_name = build_configuration.split('_', 1)
if not default_config_name:
if _CheckConfig(_BUILD_CONFIGURATION_KEY, raw_configuration, config_name):
default_config_name = config_name
if not default_platform_name:
if _CheckPlatform(_BUILD_CONFIGURATION_KEY, raw_configuration,
default_platform_name = platform_name
return default_config_name, default_platform_name
def GetGyp():
"""Gets the GYP module, loading it, if necessary."""
if 'gyp' not in sys.modules:
0, os.path.join(paths.REPOSITORY_ROOT, 'tools', 'gyp', 'pylib'))
return sys.modules['gyp']
def GypDebugOptions():
"""Returns all valid GYP debug options."""
debug_modes = []
gyp = GetGyp()
for name in dir(gyp):
if name.startswith('DEBUG_'):
debug_modes.append(getattr(gyp, name))
return debug_modes
def GetToolchainsDir():
"""Gets the directory that contains all downloaded toolchains."""
home_dir = os.environ.get('HOME')
toolchains_dir = os.path.realpath(
os.path.join(home_dir, _STARBOARD_TOOLCHAINS_DIR_NAME)))
if not os.path.isdir(toolchains_dir):
# Ensure the toolchains directory exists.
return toolchains_dir
def _GetClangBasePath(clang_spec):
return os.path.join(GetToolchainsDir(),
'x86_64-linux-gnu-clang-chromium-' + clang_spec.revision)
def _GetClangBinPath(clang_spec):
return os.path.join(_GetClangBasePath(clang_spec), 'bin')
def EnsureClangAvailable(clang_spec):
"""Ensure the expected version of Clang is available."""
# Run the Clang update tool to ensure correct version of Clang,
# then check that Clang is in the path.
base_dir = _GetClangBasePath(clang_spec)
download_clang.UpdateClang(target_dir=base_dir, revision=clang_spec.revision)
# downloads Clang to this path.
clang_bin = os.path.join(_GetClangBinPath(clang_spec), 'clang')
if not os.path.exists(clang_bin):
raise RuntimeError('Clang not found.')
return _GetClangBasePath(clang_spec)
def GetHostCompilerEnvironment(clang_spec, build_accelerator):
"""Return the host compiler toolchain environment."""
toolchain_dir = EnsureClangAvailable(clang_spec)
toolchain_bin_dir = os.path.join(toolchain_dir, 'bin')
cc_clang = os.path.join(toolchain_bin_dir, 'clang')
cxx_clang = os.path.join(toolchain_bin_dir, 'clang++')
host_clang_environment = {
'CC_host': build_accelerator + ' ' + cc_clang,
'CXX_host': build_accelerator + ' ' + cxx_clang,
'LD_host': cxx_clang,
'ARFLAGS_host': 'rcs',
'ARTHINFLAGS_host': 'rcsT',
return host_clang_environment
def _ModuleLoaded(module_name, module_path):
if module_name not in sys.modules:
return False
# Sometimes one of these has .pyc and the other has .py, but we don't care.
extensionless_loaded_path = os.path.splitext(
extensionless_module_path = os.path.splitext(os.path.abspath(module_path))[0]
return extensionless_loaded_path == extensionless_module_path
def _LoadPlatformConfig(platform_name):
"""Loads a platform specific configuration.
The function will use the provided platform name to load
a python file with a matching name that contains the platform
specific configuration.
platform_name: Platform name.
Instance of a class derived from PlatformConfigBase.
logging.debug('Loading platform configuration for "%s".', platform_name)
if platform.IsValid(platform_name):
platform_path = os.path.join(paths.REPOSITORY_ROOT,
module_path = os.path.join(platform_path, '')
if not _ModuleLoaded('platform_module', module_path):
platform_module = imp.load_source('platform_module', module_path)
platform_module = sys.modules['platform_module']
module_path = os.path.join('config', '' % platform_name)
platform_module = importlib.import_module('config.%s' % platform_name)
except (ImportError, IOError):
logging.exception('Unable to import "%s".', module_path)
return None
if not hasattr(platform_module, 'CreatePlatformConfig'):
logging.error('"%s" does not contain CreatePlatformConfig.', module_path)
return None
platform_configuration = platform_module.CreatePlatformConfig()
return platform_configuration
except RuntimeError:
logging.exception('Exception in CreatePlatformConfig.')
return None
# Global cache of the platform configurations, so that platform config objects
# are only created once.
def GetPlatformConfig(platform_name):
"""Returns a platform specific configuration.
This function will return a cached platform configuration object, loading it
if it doesn't exist via a call to _LoadPlatformConfig().
platform_name: Platform name.
Instance of a class derived from PlatformConfigBase.
if platform_name not in _PLATFORM_CONFIG_DICT:
_PLATFORM_CONFIG_DICT[platform_name] = _LoadPlatformConfig(platform_name)
return _PLATFORM_CONFIG_DICT[platform_name]