Re-add third-party/abseil-cpp
Bug: 261600888 Test: no build files yet Change-Id: If35de46c822c629640fa888126290b98ee4dc41d
This commit is contained in:
Jorge E. Moreira
177
third_party/abseil-cpp/generate_def_files.py
vendored
Executable file
177
third_party/abseil-cpp/generate_def_files.py
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#!/usr/bin/env python3
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"""Script to generate Chromium's Abseil .def files at roll time.
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This script generates //third_party/abseil-app/absl/symbols_*.def at Abseil
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roll time.
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Since Abseil doesn't export symbols, Chromium is forced to consider all
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Abseil's symbols as publicly visible. On POSIX it is possible to use
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-fvisibility=default but on Windows a .def file with all the symbols
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is needed.
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Unless you are on a Windows machine, you need to set up your Chromium
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checkout for cross-compilation by following the instructions at
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https://chromium.googlesource.com/chromium/src.git/+/main/docs/win_cross.md.
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If you are on Windows, you may need to tweak this script to run, e.g. by
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changing "gn" to "gn.bat", changing "llvm-nm" to the name of your copy of
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llvm-nm, etc.
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"""
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import fnmatch
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import logging
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import os
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import re
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import subprocess
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import sys
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import tempfile
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import time
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# Matches a mangled symbol that has 'absl' in it, this should be a good
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# enough heuristic to select Abseil symbols to list in the .def file.
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ABSL_SYM_RE = re.compile(r'0* [BT] (?P<symbol>(\?+)[^\?].*absl.*)')
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if sys.platform == 'win32':
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# Typical dumpbin /symbol lines look like this:
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# 04B 0000000C SECT14 notype Static | ?$S1@?1??SetCurrent
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# ThreadIdentity@base_internal@absl@@YAXPAUThreadIdentity@12@P6AXPAX@Z@Z@4IA
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# (unsigned int `void __cdecl absl::base_internal::SetCurrentThreadIdentity...
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# We need to start on "| ?" and end on the first " (" (stopping on space would
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# also work).
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# This regex is identical inside the () characters except for the ? after .*,
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# which is needed to prevent greedily grabbing the undecorated version of the
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# symbols.
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ABSL_SYM_RE = '.*External \| (?P<symbol>(\?+)[^\?].*?absl.*?) \(.*'
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# Typical exported symbols in dumpbin /directives look like:
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# /EXPORT:?kHexChar@numbers_internal@absl@@3QBDB,DATA
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ABSL_EXPORTED_RE = '.*/EXPORT:(.*),.*'
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def _DebugOrRelease(is_debug):
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return 'dbg' if is_debug else 'rel'
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def _GenerateDefFile(cpu, is_debug, extra_gn_args=[], suffix=None):
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"""Generates a .def file for the absl component build on the specified CPU."""
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if extra_gn_args:
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assert suffix != None, 'suffix is needed when extra_gn_args is used'
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flavor = _DebugOrRelease(is_debug)
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gn_args = [
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'ffmpeg_branding = "Chrome"',
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'is_component_build = true',
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'is_debug = {}'.format(str(is_debug).lower()),
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'proprietary_codecs = true',
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'symbol_level = 0',
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'target_cpu = "{}"'.format(cpu),
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'target_os = "win"',
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]
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gn_args.extend(extra_gn_args)
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gn = 'gn'
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autoninja = 'autoninja'
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symbol_dumper = ['third_party/llvm-build/Release+Asserts/bin/llvm-nm']
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if sys.platform == 'win32':
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gn = 'gn.bat'
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autoninja = 'autoninja.bat'
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symbol_dumper = ['dumpbin', '/symbols']
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import shutil
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if not shutil.which('dumpbin'):
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logging.error('dumpbin not found. Run tools\win\setenv.bat.')
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exit(1)
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with tempfile.TemporaryDirectory() as out_dir:
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logging.info('[%s - %s] Creating tmp out dir in %s', cpu, flavor, out_dir)
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subprocess.check_call([gn, 'gen', out_dir, '--args=' + ' '.join(gn_args)],
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cwd=os.getcwd())
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logging.info('[%s - %s] gn gen completed', cpu, flavor)
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subprocess.check_call(
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[autoninja, '-C', out_dir, 'third_party/abseil-cpp:absl_component_deps'],
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cwd=os.getcwd())
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logging.info('[%s - %s] autoninja completed', cpu, flavor)
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obj_files = []
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for root, _dirnames, filenames in os.walk(
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os.path.join(out_dir, 'obj', 'third_party', 'abseil-cpp')):
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matched_files = fnmatch.filter(filenames, '*.obj')
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obj_files.extend((os.path.join(root, f) for f in matched_files))
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logging.info('[%s - %s] Found %d object files.', cpu, flavor, len(obj_files))
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absl_symbols = set()
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dll_exports = set()
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if sys.platform == 'win32':
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for f in obj_files:
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# Track all of the functions exported with __declspec(dllexport) and
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# don't list them in the .def file - double-exports are not allowed. The
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# error is "lld-link: error: duplicate /export option".
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exports_out = subprocess.check_output(['dumpbin', '/directives', f], cwd=os.getcwd())
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for line in exports_out.splitlines():
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line = line.decode('utf-8')
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match = re.match(ABSL_EXPORTED_RE, line)
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if match:
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dll_exports.add(match.groups()[0])
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for f in obj_files:
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stdout = subprocess.check_output(symbol_dumper + [f], cwd=os.getcwd())
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for line in stdout.splitlines():
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try:
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line = line.decode('utf-8')
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except UnicodeDecodeError:
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# Due to a dumpbin bug there are sometimes invalid utf-8 characters in
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# the output. This only happens on an unimportant line so it can
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# safely and silently be skipped.
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# https://developercommunity.visualstudio.com/content/problem/1091330/dumpbin-symbols-produces-randomly-wrong-output-on.html
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continue
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match = re.match(ABSL_SYM_RE, line)
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if match:
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symbol = match.group('symbol')
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assert symbol.count(' ') == 0, ('Regex matched too much, probably got '
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'undecorated name as well')
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# Avoid getting names exported with dllexport, to avoid
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# "lld-link: error: duplicate /export option" on symbols such as:
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# ?kHexChar@numbers_internal@absl@@3QBDB
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if symbol in dll_exports:
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continue
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# Avoid to export deleting dtors since they trigger
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# "lld-link: error: export of deleting dtor" linker errors, see
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# crbug.com/1201277.
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if symbol.startswith('??_G'):
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continue
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absl_symbols.add(symbol)
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logging.info('[%s - %s] Found %d absl symbols.', cpu, flavor, len(absl_symbols))
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if extra_gn_args:
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def_file = os.path.join('third_party', 'abseil-cpp',
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'symbols_{}_{}_{}.def'.format(cpu, flavor, suffix))
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else:
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def_file = os.path.join('third_party', 'abseil-cpp',
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'symbols_{}_{}.def'.format(cpu, flavor))
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with open(def_file, 'w', newline='') as f:
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f.write('EXPORTS\n')
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for s in sorted(absl_symbols):
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f.write(' {}\n'.format(s))
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# Hack, it looks like there is a race in the directory cleanup.
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time.sleep(10)
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logging.info('[%s - %s] .def file successfully generated.', cpu, flavor)
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if __name__ == '__main__':
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logging.getLogger().setLevel(logging.INFO)
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if sys.version_info.major == 2:
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logging.error('This script requires Python 3.')
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exit(1)
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if not os.getcwd().endswith('src') or not os.path.exists('chrome/browser'):
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logging.error('Run this script from a chromium/src/ directory.')
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exit(1)
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_GenerateDefFile('x86', True)
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_GenerateDefFile('x86', False)
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_GenerateDefFile('x64', True)
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_GenerateDefFile('x64', False)
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_GenerateDefFile('x64', False, ['is_asan = true'], 'asan')
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_GenerateDefFile('arm64', True)
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_GenerateDefFile('arm64', False)
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