| # SPDX-License-Identifier: Apache-2.0 |
| # Copyright 2013-2016 The Meson development team |
| |
| # This script extracts the symbols of a given shared library |
| # into a file. If the symbols have not changed, the file is not |
| # touched. This information is used to skip link steps if the |
| # ABI has not changed. |
| |
| # This file is basically a reimplementation of |
| # http://cgit.freedesktop.org/libreoffice/core/commit/?id=3213cd54b76bc80a6f0516aac75a48ff3b2ad67c |
| from __future__ import annotations |
| |
| import typing as T |
| import os, sys |
| from .. import mesonlib |
| from .. import mlog |
| from ..mesonlib import Popen_safe |
| import argparse |
| |
| parser = argparse.ArgumentParser() |
| |
| parser.add_argument('--cross-host', default=None, dest='cross_host', |
| help='cross compilation host platform') |
| parser.add_argument('args', nargs='+') |
| |
| TOOL_WARNING_FILE = None |
| RELINKING_WARNING = 'Relinking will always happen on source changes.' |
| |
| def dummy_syms(outfilename: str) -> None: |
| """Just touch it so relinking happens always.""" |
| with open(outfilename, 'w', encoding='utf-8'): |
| pass |
| |
| def write_if_changed(text: str, outfilename: str) -> None: |
| try: |
| with open(outfilename, encoding='utf-8') as f: |
| oldtext = f.read() |
| if text == oldtext: |
| return |
| except FileNotFoundError: |
| pass |
| with open(outfilename, 'w', encoding='utf-8') as f: |
| f.write(text) |
| |
| def print_tool_warning(tools: T.List[str], msg: str, stderr: T.Optional[str] = None) -> None: |
| if os.path.exists(TOOL_WARNING_FILE): |
| return |
| m = f'{tools!r} {msg}. {RELINKING_WARNING}' |
| if stderr: |
| m += '\n' + stderr |
| mlog.warning(m) |
| # Write it out so we don't warn again |
| with open(TOOL_WARNING_FILE, 'w', encoding='utf-8'): |
| pass |
| |
| def get_tool(name: str) -> T.List[str]: |
| evar = name.upper() |
| if evar in os.environ: |
| import shlex |
| return shlex.split(os.environ[evar]) |
| return [name] |
| |
| def call_tool(name: str, args: T.List[str], **kwargs: T.Any) -> str: |
| tool = get_tool(name) |
| try: |
| p, output, e = Popen_safe(tool + args, **kwargs) |
| except FileNotFoundError: |
| print_tool_warning(tool, 'not found') |
| return None |
| except PermissionError: |
| print_tool_warning(tool, 'not usable') |
| return None |
| if p.returncode != 0: |
| print_tool_warning(tool, 'does not work', e) |
| return None |
| return output |
| |
| def call_tool_nowarn(tool: T.List[str], **kwargs: T.Any) -> T.Tuple[str, str]: |
| try: |
| p, output, e = Popen_safe(tool, **kwargs) |
| except FileNotFoundError: |
| return None, '{!r} not found\n'.format(tool[0]) |
| except PermissionError: |
| return None, '{!r} not usable\n'.format(tool[0]) |
| if p.returncode != 0: |
| return None, e |
| return output, None |
| |
| def gnu_syms(libfilename: str, outfilename: str) -> None: |
| # Get the name of the library |
| output = call_tool('readelf', ['-d', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| result = [x for x in output.split('\n') if 'SONAME' in x] |
| assert len(result) <= 1 |
| # Get a list of all symbols exported |
| output = call_tool('nm', ['--dynamic', '--extern-only', '--defined-only', |
| '--format=posix', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| for line in output.split('\n'): |
| if not line: |
| continue |
| line_split = line.split() |
| entry = line_split[0:2] |
| # Store the size of symbols pointing to data objects so we relink |
| # when those change, which is needed because of copy relocations |
| # https://github.com/mesonbuild/meson/pull/7132#issuecomment-628353702 |
| if line_split[1].upper() in {'B', 'G', 'D'} and len(line_split) >= 4: |
| entry += [line_split[3]] |
| result += [' '.join(entry)] |
| write_if_changed('\n'.join(result) + '\n', outfilename) |
| |
| def solaris_syms(libfilename: str, outfilename: str) -> None: |
| # gnu_syms() works with GNU nm & readelf, not Solaris nm & elfdump |
| origpath = os.environ['PATH'] |
| try: |
| os.environ['PATH'] = '/usr/gnu/bin:' + origpath |
| gnu_syms(libfilename, outfilename) |
| finally: |
| os.environ['PATH'] = origpath |
| |
| def osx_syms(libfilename: str, outfilename: str) -> None: |
| # Get the name of the library |
| output = call_tool('otool', ['-l', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| arr = output.split('\n') |
| for (i, val) in enumerate(arr): |
| if 'LC_ID_DYLIB' in val: |
| match = i |
| break |
| result = [arr[match + 2], arr[match + 5]] # Libreoffice stores all 5 lines but the others seem irrelevant. |
| # Get a list of all symbols exported |
| output = call_tool('nm', ['--extern-only', '--defined-only', |
| '--format=posix', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| result += [' '.join(x.split()[0:2]) for x in output.split('\n')] |
| write_if_changed('\n'.join(result) + '\n', outfilename) |
| |
| def openbsd_syms(libfilename: str, outfilename: str) -> None: |
| # Get the name of the library |
| output = call_tool('readelf', ['-d', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| result = [x for x in output.split('\n') if 'SONAME' in x] |
| assert len(result) <= 1 |
| # Get a list of all symbols exported |
| output = call_tool('nm', ['-D', '-P', '-g', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| # U = undefined (cope with the lack of --defined-only option) |
| result += [' '.join(x.split()[0:2]) for x in output.split('\n') if x and not x.endswith('U ')] |
| write_if_changed('\n'.join(result) + '\n', outfilename) |
| |
| def freebsd_syms(libfilename: str, outfilename: str) -> None: |
| # Get the name of the library |
| output = call_tool('readelf', ['-d', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| result = [x for x in output.split('\n') if 'SONAME' in x] |
| assert len(result) <= 1 |
| # Get a list of all symbols exported |
| output = call_tool('nm', ['--dynamic', '--extern-only', '--defined-only', |
| '--format=posix', libfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| |
| result += [' '.join(x.split()[0:2]) for x in output.split('\n')] |
| write_if_changed('\n'.join(result) + '\n', outfilename) |
| |
| def cygwin_syms(impfilename: str, outfilename: str) -> None: |
| # Get the name of the library |
| output = call_tool('dlltool', ['-I', impfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| result = [output] |
| # Get the list of all symbols exported |
| output = call_tool('nm', ['--extern-only', '--defined-only', |
| '--format=posix', impfilename]) |
| if not output: |
| dummy_syms(outfilename) |
| return |
| for line in output.split('\n'): |
| if ' T ' not in line: |
| continue |
| result.append(line.split(maxsplit=1)[0]) |
| write_if_changed('\n'.join(result) + '\n', outfilename) |
| |
| def _get_implib_dllname(impfilename: str) -> T.Tuple[T.List[str], str]: |
| all_stderr = '' |
| # First try lib.exe, which is provided by MSVC. Then llvm-lib.exe, by LLVM |
| # for clang-cl. |
| # |
| # We cannot call get_tool on `lib` because it will look at the `LIB` env |
| # var which is the list of library paths MSVC will search for import |
| # libraries while linking. |
| for lib in (['lib'], get_tool('llvm-lib')): |
| output, e = call_tool_nowarn(lib + ['-list', impfilename]) |
| if output: |
| # The output is a list of DLLs that each symbol exported by the import |
| # library is available in. We only build import libraries that point to |
| # a single DLL, so we can pick any of these. Pick the last one for |
| # simplicity. Also skip the last line, which is empty. |
| return output.split('\n')[-2:-1], None |
| all_stderr += e |
| # Next, try dlltool.exe which is provided by MinGW |
| output, e = call_tool_nowarn(get_tool('dlltool') + ['-I', impfilename]) |
| if output: |
| return [output], None |
| all_stderr += e |
| return ([], all_stderr) |
| |
| def _get_implib_exports(impfilename: str) -> T.Tuple[T.List[str], str]: |
| all_stderr = '' |
| # Force dumpbin.exe to use en-US so we can parse its output |
| env = os.environ.copy() |
| env['VSLANG'] = '1033' |
| output, e = call_tool_nowarn(get_tool('dumpbin') + ['-exports', impfilename], env=env) |
| if output: |
| lines = output.split('\n') |
| start = lines.index('File Type: LIBRARY') |
| end = lines.index(' Summary') |
| return lines[start:end], None |
| all_stderr += e |
| # Next, try llvm-nm.exe provided by LLVM, then nm.exe provided by MinGW |
| for nm in ('llvm-nm', 'nm'): |
| output, e = call_tool_nowarn(get_tool(nm) + ['--extern-only', '--defined-only', |
| '--format=posix', impfilename]) |
| if output: |
| result = [] |
| for line in output.split('\n'): |
| if ' T ' not in line or line.startswith('.text'): |
| continue |
| result.append(line.split(maxsplit=1)[0]) |
| return result, None |
| all_stderr += e |
| return ([], all_stderr) |
| |
| def windows_syms(impfilename: str, outfilename: str) -> None: |
| # Get the name of the library |
| result, e = _get_implib_dllname(impfilename) |
| if not result: |
| print_tool_warning(['lib', 'llvm-lib', 'dlltool'], 'do not work or were not found', e) |
| dummy_syms(outfilename) |
| return |
| # Get a list of all symbols exported |
| symbols, e = _get_implib_exports(impfilename) |
| if not symbols: |
| print_tool_warning(['dumpbin', 'llvm-nm', 'nm'], 'do not work or were not found', e) |
| dummy_syms(outfilename) |
| return |
| result += symbols |
| write_if_changed('\n'.join(result) + '\n', outfilename) |
| |
| def gen_symbols(libfilename: str, impfilename: str, outfilename: str, cross_host: str) -> None: |
| if cross_host is not None: |
| # In case of cross builds just always relink. In theory we could |
| # determine the correct toolset, but we would need to use the correct |
| # `nm`, `readelf`, etc, from the cross info which requires refactoring. |
| dummy_syms(outfilename) |
| elif mesonlib.is_linux() or mesonlib.is_hurd(): |
| gnu_syms(libfilename, outfilename) |
| elif mesonlib.is_osx(): |
| osx_syms(libfilename, outfilename) |
| elif mesonlib.is_openbsd(): |
| openbsd_syms(libfilename, outfilename) |
| elif mesonlib.is_freebsd(): |
| freebsd_syms(libfilename, outfilename) |
| elif mesonlib.is_netbsd(): |
| freebsd_syms(libfilename, outfilename) |
| elif mesonlib.is_windows(): |
| if os.path.isfile(impfilename): |
| windows_syms(impfilename, outfilename) |
| else: |
| # No import library. Not sure how the DLL is being used, so just |
| # rebuild everything that links to it every time. |
| dummy_syms(outfilename) |
| elif mesonlib.is_cygwin(): |
| if os.path.isfile(impfilename): |
| cygwin_syms(impfilename, outfilename) |
| else: |
| # No import library. Not sure how the DLL is being used, so just |
| # rebuild everything that links to it every time. |
| dummy_syms(outfilename) |
| elif mesonlib.is_sunos(): |
| solaris_syms(libfilename, outfilename) |
| else: |
| if not os.path.exists(TOOL_WARNING_FILE): |
| mlog.warning('Symbol extracting has not been implemented for this ' |
| 'platform. ' + RELINKING_WARNING) |
| # Write it out so we don't warn again |
| with open(TOOL_WARNING_FILE, 'w', encoding='utf-8'): |
| pass |
| dummy_syms(outfilename) |
| |
| def run(args: T.List[str]) -> int: |
| global TOOL_WARNING_FILE # pylint: disable=global-statement |
| options = parser.parse_args(args) |
| if len(options.args) != 4: |
| print('symbolextractor.py <shared library file> <import library> <output file>') |
| sys.exit(1) |
| privdir = os.path.join(options.args[0], 'meson-private') |
| TOOL_WARNING_FILE = os.path.join(privdir, 'symbolextractor_tool_warning_printed') |
| libfile = options.args[1] |
| impfile = options.args[2] # Only used on Windows |
| outfile = options.args[3] |
| gen_symbols(libfile, impfile, outfile, options.cross_host) |
| return 0 |
| |
| if __name__ == '__main__': |
| sys.exit(run(sys.argv[1:])) |
