mirror of
https://github.com/dart-lang/sdk
synced 2024-09-05 08:24:39 +00:00
![Nate Bosch](/assets/img/avatar_default.png)
- Add `.style.yapf` with configuration to use Google style. - Run `yapf` on all `.py` files in this repo. - Manually fix one trailing space in a doc string. - Run `git cl format runtime` to satisfy presubmit. Change-Id: I7e6bd11e91f07926b9188362599af398551eed79 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111600 Commit-Queue: Nate Bosch <nbosch@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
574 lines
24 KiB
Python
574 lines
24 KiB
Python
#!/usr/bin/env python
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# Copyright 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# For Dart developers:
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# This file keeps the MSVC toolchain up-to-date for Google developers.
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# It is copied from Chromium:
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# https://cs.chromium.org/chromium/src/build/vs_toolchain.py
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# with modifications that update paths and remove dependencies on gyp.
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# To update to a new MSVC toolchain, copy the updated script from the Chromium
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# tree, edit to make it work in the Dart tree by updating paths in the original script.
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from __future__ import print_function
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import collections
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import glob
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import json
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import os
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import pipes
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import platform
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import re
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import shutil
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import stat
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import subprocess
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import sys
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from gn_helpers import ToGNString
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script_dir = os.path.dirname(os.path.realpath(__file__))
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chrome_src = os.path.abspath(os.path.join(script_dir, os.pardir))
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SRC_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
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sys.path.insert(0, os.path.join(chrome_src, 'tools'))
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json_data_file = os.path.join(script_dir, 'win_toolchain.json')
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# VS versions are listed in descending order of priority (highest first).
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MSVS_VERSIONS = collections.OrderedDict([
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('2017', '15.0'),
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('2019', '16.0'),
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])
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def SetEnvironmentAndGetRuntimeDllDirs():
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"""Sets up os.environ to use the depot_tools VS toolchain with gyp, and
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returns the location of the VC runtime DLLs so they can be copied into
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the output directory after gyp generation.
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Return value is [x64path, x86path, 'Arm64Unused'] or None. arm64path is
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generated separately because there are multiple folders for the arm64 VC
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runtime.
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"""
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vs_runtime_dll_dirs = None
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depot_tools_win_toolchain = \
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bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1')))
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# When running on a non-Windows host, only do this if the SDK has explicitly
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# been downloaded before (in which case json_data_file will exist).
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if ((sys.platform in ('win32', 'cygwin') or os.path.exists(json_data_file))
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and depot_tools_win_toolchain):
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if ShouldUpdateToolchain():
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if len(sys.argv) > 1 and sys.argv[1] == 'update':
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update_result = Update()
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else:
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update_result = Update(no_download=True)
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if update_result != 0:
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raise Exception(
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'Failed to update, error code %d.' % update_result)
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with open(json_data_file, 'r') as tempf:
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toolchain_data = json.load(tempf)
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toolchain = toolchain_data['path']
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version = toolchain_data['version']
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win_sdk = toolchain_data.get('win_sdk')
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if not win_sdk:
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win_sdk = toolchain_data['win8sdk']
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wdk = toolchain_data['wdk']
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# TODO(scottmg): The order unfortunately matters in these. They should be
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# split into separate keys for x64/x86/arm64. (See CopyDlls call below).
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# http://crbug.com/345992
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vs_runtime_dll_dirs = toolchain_data['runtime_dirs']
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# The number of runtime_dirs in the toolchain_data was two (x64/x86) but
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# changed to three (x64/x86/arm64) and this code needs to handle both
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# possibilities, which can change independently from this code.
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if len(vs_runtime_dll_dirs) == 2:
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vs_runtime_dll_dirs.append('Arm64Unused')
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os.environ['GYP_MSVS_OVERRIDE_PATH'] = toolchain
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os.environ['GYP_MSVS_VERSION'] = version
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os.environ['WINDOWSSDKDIR'] = win_sdk
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os.environ['WDK_DIR'] = wdk
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# Include the VS runtime in the PATH in case it's not machine-installed.
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runtime_path = os.path.pathsep.join(vs_runtime_dll_dirs)
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os.environ['PATH'] = runtime_path + os.path.pathsep + os.environ['PATH']
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elif sys.platform == 'win32' and not depot_tools_win_toolchain:
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if not 'GYP_MSVS_OVERRIDE_PATH' in os.environ:
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os.environ['GYP_MSVS_OVERRIDE_PATH'] = DetectVisualStudioPath()
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if not 'GYP_MSVS_VERSION' in os.environ:
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os.environ['GYP_MSVS_VERSION'] = GetVisualStudioVersion()
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# When using an installed toolchain these files aren't needed in the output
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# directory in order to run binaries locally, but they are needed in order
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# to create isolates or the mini_installer. Copying them to the output
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# directory ensures that they are available when needed.
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bitness = platform.architecture()[0]
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# When running 64-bit python the x64 DLLs will be in System32
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# ARM64 binaries will not be available in the system directories because we
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# don't build on ARM64 machines.
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x64_path = 'System32' if bitness == '64bit' else 'Sysnative'
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x64_path = os.path.join(os.path.expandvars('%windir%'), x64_path)
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vs_runtime_dll_dirs = [
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x64_path,
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os.path.join(os.path.expandvars('%windir%'), 'SysWOW64'),
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'Arm64Unused'
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]
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return vs_runtime_dll_dirs
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def _RegistryGetValueUsingWinReg(key, value):
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"""Use the _winreg module to obtain the value of a registry key.
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Args:
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key: The registry key.
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value: The particular registry value to read.
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Return:
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contents of the registry key's value, or None on failure. Throws
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ImportError if _winreg is unavailable.
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"""
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import _winreg
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try:
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root, subkey = key.split('\\', 1)
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assert root == 'HKLM' # Only need HKLM for now.
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with _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, subkey) as hkey:
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return _winreg.QueryValueEx(hkey, value)[0]
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except WindowsError:
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return None
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def _RegistryGetValue(key, value):
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try:
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return _RegistryGetValueUsingWinReg(key, value)
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except ImportError:
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raise Exception('The python library _winreg not found.')
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def GetVisualStudioVersion():
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"""Return best available version of Visual Studio.
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"""
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env_version = os.environ.get('GYP_MSVS_VERSION')
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if env_version:
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return env_version
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supported_versions = MSVS_VERSIONS.keys()
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# VS installed in depot_tools for Googlers
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if bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1'))):
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return supported_versions[0]
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# VS installed in system for external developers
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supported_versions_str = ', '.join(
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'{} ({})'.format(v, k) for k, v in MSVS_VERSIONS.items())
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available_versions = []
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for version in supported_versions:
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for path in (
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os.environ.get('vs%s_install' % version),
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os.path.expandvars('%ProgramFiles(x86)%' +
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'/Microsoft Visual Studio/%s' % version)):
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if path and os.path.exists(path):
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available_versions.append(version)
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break
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if not available_versions:
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raise Exception('No supported Visual Studio can be found.'
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' Supported versions are: %s.' % supported_versions_str)
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return available_versions[0]
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def DetectVisualStudioPath():
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"""Return path to the GYP_MSVS_VERSION of Visual Studio.
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"""
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# Note that this code is used from
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# build/toolchain/win/setup_toolchain.py as well.
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version_as_year = GetVisualStudioVersion()
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# The VC++ >=2017 install location needs to be located using COM instead of
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# the registry. For details see:
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# https://blogs.msdn.microsoft.com/heaths/2016/09/15/changes-to-visual-studio-15-setup/
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# For now we use a hardcoded default with an environment variable override.
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for path in (
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os.environ.get('vs%s_install' % version_as_year),
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os.path.expandvars(
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'%ProgramFiles(x86)%' +
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'/Microsoft Visual Studio/%s/Enterprise' % version_as_year),
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os.path.expandvars(
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'%ProgramFiles(x86)%' +
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'/Microsoft Visual Studio/%s/Professional' % version_as_year),
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os.path.expandvars(
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'%ProgramFiles(x86)%' +
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'/Microsoft Visual Studio/%s/Community' % version_as_year),
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os.path.expandvars(
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'%ProgramFiles(x86)%' +
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'/Microsoft Visual Studio/%s/Preview' % version_as_year)):
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if path and os.path.exists(path):
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return path
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raise Exception('Visual Studio Version %s (from GYP_MSVS_VERSION)'
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' not found.' % version_as_year)
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def _CopyRuntimeImpl(target, source, verbose=True):
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"""Copy |source| to |target| if it doesn't already exist or if it needs to be
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updated (comparing last modified time as an approximate float match as for
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some reason the values tend to differ by ~1e-07 despite being copies of the
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same file... https://crbug.com/603603).
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"""
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if (os.path.isdir(os.path.dirname(target)) and
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(not os.path.isfile(target) or
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abs(os.stat(target).st_mtime - os.stat(source).st_mtime) >= 0.01)):
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if verbose:
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print('Copying %s to %s...' % (source, target))
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if os.path.exists(target):
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# Make the file writable so that we can delete it now, and keep it
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# readable.
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os.chmod(target, stat.S_IWRITE | stat.S_IREAD)
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os.unlink(target)
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shutil.copy2(source, target)
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# Make the file writable so that we can overwrite or delete it later,
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# keep it readable.
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os.chmod(target, stat.S_IWRITE | stat.S_IREAD)
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def _SortByHighestVersionNumberFirst(list_of_str_versions):
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"""This sorts |list_of_str_versions| according to version number rules
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so that version "1.12" is higher than version "1.9". Does not work
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with non-numeric versions like 1.4.a8 which will be higher than
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1.4.a12. It does handle the versions being embedded in file paths.
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"""
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def to_int_if_int(x):
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try:
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return int(x)
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except ValueError:
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return x
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def to_number_sequence(x):
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part_sequence = re.split(r'[\\/\.]', x)
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return [to_int_if_int(x) for x in part_sequence]
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list_of_str_versions.sort(key=to_number_sequence, reverse=True)
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def _CopyUCRTRuntime(target_dir, source_dir, target_cpu, dll_pattern, suffix):
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"""Copy both the msvcp and vccorlib runtime DLLs, only if the target doesn't
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exist, but the target directory does exist."""
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if target_cpu == 'arm64':
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# Windows ARM64 VCRuntime is located at {toolchain_root}/VC/Redist/MSVC/
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# {x.y.z}/[debug_nonredist/]arm64/Microsoft.VC141.CRT/.
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vc_redist_root = FindVCRedistRoot()
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if suffix.startswith('.'):
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source_dir = os.path.join(vc_redist_root, 'arm64',
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'Microsoft.VC141.CRT')
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else:
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source_dir = os.path.join(vc_redist_root, 'debug_nonredist',
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'arm64', 'Microsoft.VC141.DebugCRT')
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for file_part in ('msvcp', 'vccorlib', 'vcruntime'):
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dll = dll_pattern % file_part
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target = os.path.join(target_dir, dll)
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source = os.path.join(source_dir, dll)
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_CopyRuntimeImpl(target, source)
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# Copy the UCRT files from the Windows SDK. This location includes the
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# api-ms-win-crt-*.dll files that are not found in the Windows directory.
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# These files are needed for component builds. If WINDOWSSDKDIR is not set
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# use the default SDK path. This will be the case when
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# DEPOT_TOOLS_WIN_TOOLCHAIN=0 and vcvarsall.bat has not been run.
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win_sdk_dir = os.path.normpath(
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os.environ.get(
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'WINDOWSSDKDIR',
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os.path.expandvars('%ProgramFiles(x86)%'
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'\\Windows Kits\\10')))
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# ARM64 doesn't have a redist for the ucrt DLLs because they are always
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# present in the OS.
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if target_cpu != 'arm64':
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# Starting with the 10.0.17763 SDK the ucrt files are in a version-named
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# directory - this handles both cases.
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redist_dir = os.path.join(win_sdk_dir, 'Redist')
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version_dirs = glob.glob(os.path.join(redist_dir, '10.*'))
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if len(version_dirs) > 0:
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_SortByHighestVersionNumberFirst(version_dirs)
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redist_dir = version_dirs[0]
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ucrt_dll_dirs = os.path.join(redist_dir, 'ucrt', 'DLLs', target_cpu)
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ucrt_files = glob.glob(os.path.join(ucrt_dll_dirs, 'api-ms-win-*.dll'))
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assert len(ucrt_files) > 0
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for ucrt_src_file in ucrt_files:
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file_part = os.path.basename(ucrt_src_file)
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ucrt_dst_file = os.path.join(target_dir, file_part)
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_CopyRuntimeImpl(ucrt_dst_file, ucrt_src_file, False)
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# We must copy ucrtbase.dll for x64/x86, and ucrtbased.dll for all CPU types.
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if target_cpu != 'arm64' or not suffix.startswith('.'):
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if not suffix.startswith('.'):
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# ucrtbased.dll is located at {win_sdk_dir}/bin/{a.b.c.d}/{target_cpu}/
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# ucrt/.
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sdk_redist_root = os.path.join(win_sdk_dir, 'bin')
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sdk_bin_sub_dirs = os.listdir(sdk_redist_root)
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# Select the most recent SDK if there are multiple versions installed.
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_SortByHighestVersionNumberFirst(sdk_bin_sub_dirs)
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for directory in sdk_bin_sub_dirs:
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sdk_redist_root_version = os.path.join(sdk_redist_root,
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directory)
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if not os.path.isdir(sdk_redist_root_version):
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continue
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if re.match(r'10\.\d+\.\d+\.\d+', directory):
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source_dir = os.path.join(sdk_redist_root_version,
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target_cpu, 'ucrt')
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break
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_CopyRuntimeImpl(
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os.path.join(target_dir, 'ucrtbase' + suffix),
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os.path.join(source_dir, 'ucrtbase' + suffix))
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def FindVCComponentRoot(component):
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"""Find the most recent Tools or Redist or other directory in an MSVC install.
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Typical results are {toolchain_root}/VC/{component}/MSVC/{x.y.z}. The {x.y.z}
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version number part changes frequently so the highest version number found is
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used.
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"""
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SetEnvironmentAndGetRuntimeDllDirs()
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assert ('GYP_MSVS_OVERRIDE_PATH' in os.environ)
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vc_component_msvc_root = os.path.join(os.environ['GYP_MSVS_OVERRIDE_PATH'],
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'VC', component, 'MSVC')
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vc_component_msvc_contents = os.listdir(vc_component_msvc_root)
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# Select the most recent toolchain if there are several.
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_SortByHighestVersionNumberFirst(vc_component_msvc_contents)
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for directory in vc_component_msvc_contents:
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if not os.path.isdir(os.path.join(vc_component_msvc_root, directory)):
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continue
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if re.match(r'14\.\d+\.\d+', directory):
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return os.path.join(vc_component_msvc_root, directory)
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raise Exception('Unable to find the VC %s directory.' % component)
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def FindVCRedistRoot():
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"""In >=VS2017, Redist binaries are located in
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{toolchain_root}/VC/Redist/MSVC/{x.y.z}/{target_cpu}/.
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This returns the '{toolchain_root}/VC/Redist/MSVC/{x.y.z}/' path.
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"""
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return FindVCComponentRoot('Redist')
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def _CopyRuntime(target_dir, source_dir, target_cpu, debug):
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"""Copy the VS runtime DLLs, only if the target doesn't exist, but the target
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directory does exist. Handles VS 2015, 2017 and 2019."""
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suffix = 'd.dll' if debug else '.dll'
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# VS 2015, 2017 and 2019 use the same CRT DLLs.
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_CopyUCRTRuntime(target_dir, source_dir, target_cpu, '%s140' + suffix,
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suffix)
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def CopyDlls(target_dir, configuration, target_cpu):
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"""Copy the VS runtime DLLs into the requested directory as needed.
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configuration is one of 'Debug' or 'Release'.
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target_cpu is one of 'x86', 'x64' or 'arm64'.
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The debug configuration gets both the debug and release DLLs; the
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release config only the latter.
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"""
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vs_runtime_dll_dirs = SetEnvironmentAndGetRuntimeDllDirs()
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if not vs_runtime_dll_dirs:
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return
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x64_runtime, x86_runtime, arm64_runtime = vs_runtime_dll_dirs
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if target_cpu == 'x64':
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runtime_dir = x64_runtime
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elif target_cpu == 'x86':
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runtime_dir = x86_runtime
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elif target_cpu == 'arm64':
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runtime_dir = arm64_runtime
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else:
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raise Exception('Unknown target_cpu: ' + target_cpu)
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_CopyRuntime(target_dir, runtime_dir, target_cpu, debug=False)
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if configuration == 'Debug':
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_CopyRuntime(target_dir, runtime_dir, target_cpu, debug=True)
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_CopyDebugger(target_dir, target_cpu)
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def _CopyDebugger(target_dir, target_cpu):
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"""Copy dbghelp.dll and dbgcore.dll into the requested directory as needed.
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target_cpu is one of 'x86', 'x64' or 'arm64'.
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dbghelp.dll is used when Chrome needs to symbolize stacks. Copying this file
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from the SDK directory avoids using the system copy of dbghelp.dll which then
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ensures compatibility with recent debug information formats, such as VS
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2017 /debug:fastlink PDBs.
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dbgcore.dll is needed when using some functions from dbghelp.dll (like
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MinidumpWriteDump).
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"""
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win_sdk_dir = SetEnvironmentAndGetSDKDir()
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if not win_sdk_dir:
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return
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# List of debug files that should be copied, the first element of the tuple is
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# the name of the file and the second indicates if it's optional.
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debug_files = [('dbghelp.dll', False), ('dbgcore.dll', True)]
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for debug_file, is_optional in debug_files:
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full_path = os.path.join(win_sdk_dir, 'Debuggers', target_cpu,
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debug_file)
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if not os.path.exists(full_path):
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if is_optional:
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continue
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else:
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# TODO(crbug.com/773476): remove version requirement.
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raise Exception(
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'%s not found in "%s"\r\nYou must install the '
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'"Debugging Tools for Windows" feature from the Windows'
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' 10 SDK.' % (debug_file, full_path))
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target_path = os.path.join(target_dir, debug_file)
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_CopyRuntimeImpl(target_path, full_path)
|
|
|
|
|
|
def _GetDesiredVsToolchainHashes():
|
|
"""Load a list of SHA1s corresponding to the toolchains that we want installed
|
|
to build with."""
|
|
env_version = GetVisualStudioVersion()
|
|
if env_version == '2017':
|
|
# VS 2017 Update 9 (15.9.12) with 10.0.18362 SDK, 10.0.17763 version of
|
|
# Debuggers, and 10.0.17134 version of d3dcompiler_47.dll, with ARM64
|
|
# libraries.
|
|
toolchain_hash = '418b3076791776573a815eb298c8aa590307af63'
|
|
# Third parties that do not have access to the canonical toolchain can map
|
|
# canonical toolchain version to their own toolchain versions.
|
|
toolchain_hash_mapping_key = 'GYP_MSVS_HASH_%s' % toolchain_hash
|
|
return [os.environ.get(toolchain_hash_mapping_key, toolchain_hash)]
|
|
raise Exception('Unsupported VS version %s' % env_version)
|
|
|
|
|
|
def ShouldUpdateToolchain():
|
|
"""Check if the toolchain should be upgraded."""
|
|
if not os.path.exists(json_data_file):
|
|
return True
|
|
with open(json_data_file, 'r') as tempf:
|
|
toolchain_data = json.load(tempf)
|
|
version = toolchain_data['version']
|
|
env_version = GetVisualStudioVersion()
|
|
# If there's a mismatch between the version set in the environment and the one
|
|
# in the json file then the toolchain should be updated.
|
|
return version != env_version
|
|
|
|
|
|
def Update(force=False, no_download=False):
|
|
"""Requests an update of the toolchain to the specific hashes we have at
|
|
this revision. The update outputs a .json of the various configuration
|
|
information required to pass to gyp which we use in |GetToolchainDir()|.
|
|
If no_download is true then the toolchain will be configured if present but
|
|
will not be downloaded.
|
|
"""
|
|
if force != False and force != '--force':
|
|
print('Unknown parameter "%s"' % force, file=sys.stderr)
|
|
return 1
|
|
if force == '--force' or os.path.exists(json_data_file):
|
|
force = True
|
|
|
|
depot_tools_win_toolchain = \
|
|
bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1')))
|
|
if ((sys.platform in ('win32', 'cygwin') or force) and
|
|
depot_tools_win_toolchain):
|
|
import find_depot_tools
|
|
depot_tools_path = find_depot_tools.add_depot_tools_to_path()
|
|
|
|
# On Linux, the file system is usually case-sensitive while the Windows
|
|
# SDK only works on case-insensitive file systems. If it doesn't already
|
|
# exist, set up a ciopfs fuse mount to put the SDK in a case-insensitive
|
|
# part of the file system.
|
|
toolchain_dir = os.path.join(depot_tools_path, 'win_toolchain',
|
|
'vs_files')
|
|
# For testing this block, unmount existing mounts with
|
|
# fusermount -u third_party/depot_tools/win_toolchain/vs_files
|
|
if sys.platform.startswith(
|
|
'linux') and not os.path.ismount(toolchain_dir):
|
|
import distutils.spawn
|
|
ciopfs = distutils.spawn.find_executable('ciopfs')
|
|
if not ciopfs:
|
|
# ciopfs not found in PATH; try the one downloaded from the DEPS hook.
|
|
ciopfs = os.path.join(script_dir, 'ciopfs')
|
|
if not os.path.isdir(toolchain_dir):
|
|
os.mkdir(toolchain_dir)
|
|
if not os.path.isdir(toolchain_dir + '.ciopfs'):
|
|
os.mkdir(toolchain_dir + '.ciopfs')
|
|
# Without use_ino, clang's #pragma once and Wnonportable-include-path
|
|
# both don't work right, see https://llvm.org/PR34931
|
|
# use_ino doesn't slow down builds, so it seems there's no drawback to
|
|
# just using it always.
|
|
subprocess.check_call([
|
|
ciopfs, '-o', 'use_ino', toolchain_dir + '.ciopfs',
|
|
toolchain_dir
|
|
])
|
|
|
|
# Necessary so that get_toolchain_if_necessary.py will put the VS toolkit
|
|
# in the correct directory.
|
|
os.environ['GYP_MSVS_VERSION'] = GetVisualStudioVersion()
|
|
get_toolchain_args = [
|
|
sys.executable,
|
|
os.path.join(depot_tools_path, 'win_toolchain',
|
|
'get_toolchain_if_necessary.py'),
|
|
'--output-json',
|
|
json_data_file,
|
|
] + _GetDesiredVsToolchainHashes()
|
|
if force:
|
|
get_toolchain_args.append('--force')
|
|
if no_download:
|
|
get_toolchain_args.append('--no-download')
|
|
subprocess.check_call(get_toolchain_args)
|
|
|
|
return 0
|
|
|
|
|
|
def NormalizePath(path):
|
|
while path.endswith('\\'):
|
|
path = path[:-1]
|
|
return path
|
|
|
|
|
|
def SetEnvironmentAndGetSDKDir():
|
|
"""Gets location information about the current sdk (must have been
|
|
previously updated by 'update'). This is used for the GN build."""
|
|
SetEnvironmentAndGetRuntimeDllDirs()
|
|
|
|
# If WINDOWSSDKDIR is not set, search the default SDK path and set it.
|
|
if not 'WINDOWSSDKDIR' in os.environ:
|
|
default_sdk_path = os.path.expandvars('%ProgramFiles(x86)%'
|
|
'\\Windows Kits\\10')
|
|
if os.path.isdir(default_sdk_path):
|
|
os.environ['WINDOWSSDKDIR'] = default_sdk_path
|
|
|
|
return NormalizePath(os.environ['WINDOWSSDKDIR'])
|
|
|
|
|
|
def GetToolchainDir():
|
|
"""Gets location information about the current toolchain (must have been
|
|
previously updated by 'update'). This is used for the GN build."""
|
|
runtime_dll_dirs = SetEnvironmentAndGetRuntimeDllDirs()
|
|
win_sdk_dir = SetEnvironmentAndGetSDKDir()
|
|
|
|
print('''vs_path = %s
|
|
sdk_path = %s
|
|
vs_version = %s
|
|
wdk_dir = %s
|
|
runtime_dirs = %s
|
|
''' % (ToGNString(NormalizePath(os.environ['GYP_MSVS_OVERRIDE_PATH'])),
|
|
ToGNString(win_sdk_dir), ToGNString(GetVisualStudioVersion()),
|
|
ToGNString(NormalizePath(os.environ.get('WDK_DIR', ''))),
|
|
ToGNString(os.path.pathsep.join(runtime_dll_dirs or ['None']))))
|
|
|
|
|
|
def main():
|
|
commands = {
|
|
'update': Update,
|
|
'get_toolchain_dir': GetToolchainDir,
|
|
'copy_dlls': CopyDlls,
|
|
}
|
|
if len(sys.argv) < 2 or sys.argv[1] not in commands:
|
|
print('Expected one of: %s' % ', '.join(commands), file=sys.stderr)
|
|
return 1
|
|
return commands[sys.argv[1]](*sys.argv[2:])
|
|
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main())
|