169 lines
5.6 KiB
Python
169 lines
5.6 KiB
Python
#!/usr/bin/python3
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# Move symbols from other shared objects into libc.so.
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# Copyright (C) 2020-2022 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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"""Move symbols from other shared objects into libc.so.
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This script moves ABI symbols from non-libc abilists in to
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libc.abilist. Symbol versions are preserved. The script must be
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called from the top of the glibc source tree.
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"""
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import argparse
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import os.path
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import sys
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# Make available glibc Python modules.
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sys.path.append(os.path.dirname(os.path.realpath(__file__)))
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import glibcsymbols
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def add_to_libc_path(path, new_symbols):
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"""Add SYMBOLS to the abilist file PATH.
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NEW_SYMBOLS is a dictionary from glibcsymbols.VersionedSymbol
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objects to their flags.
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"""
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original_symbols = glibcsymbols.read_abilist(path)
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updated_symbols = original_symbols.copy()
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updated_symbols.update(new_symbols)
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if updated_symbols != original_symbols:
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sys.stdout.write('updating libc abilist {}\n'.format(path))
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glibcsymbols.replace_file(
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path, glibcsymbols.abilist_lines(updated_symbols))
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# The name of the libc.so abilist file.
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libc_abilist = 'libc.abilist'
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def add_to_libc_fallback(directory, subdirs, symbol_lines):
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"""Add SYMBOL_LINES to the libc.abilist files in SUBDIRS in DIRECTORY.
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All subdirectories must exist. If they do, return True. If not,
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skip processing and return False.
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"""
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abilists = [os.path.join(directory, subdir, libc_abilist)
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for subdir in subdirs]
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for abilist in abilists:
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if not os.path.exists(abilist):
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return False
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for abilist in abilists:
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add_to_libc_path(abilist, symbol_lines)
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return True
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def add_to_libc(directory, symbol_lines):
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"""Add SYMBOL_LINES (a list of strings) to libc.abilist in DIRECTORY.
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Try specific subdirectories as well if libc.abilist is not found
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in DIRECTORY.
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"""
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libc_path = os.path.join(directory, libc_abilist)
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if os.path.exists(libc_path):
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add_to_libc_path(libc_path, symbol_lines)
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return
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# Special case for powerpc32 and mips32 variants.
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if add_to_libc_fallback(directory, ('fpu', 'nofpu'), symbol_lines):
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return
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# Special case for mips64.
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if add_to_libc_fallback(directory, ('n32', 'n64'), symbol_lines):
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return
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raise IOError('No libc.abilist found for: {}'.format(directory))
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def move_symbols_1(path, to_move, moved_symbols):
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"""Move SYMBOLS from the abilist file PATH to MOVED_SYMBOLS.
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TO_MOVE must be a set of strings. MOVED_SYMBOLS is a dictionary.
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"""
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suffix = '.abilist'
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assert path.endswith('.abilist')
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library = os.path.basename(path)[:-len(suffix)]
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placeholder = '__{}_version_placeholder'.format(library)
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new_lines = []
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changed = False
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old_symbols = glibcsymbols.read_abilist(path)
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old_versions = set(versym.version for versym in old_symbols.keys())
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matching_symbols = dict(e for e in old_symbols.items()
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if e[0].symbol in to_move)
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if matching_symbols:
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sys.stdout.write('updating {} abilist {}\n'.format(library, path))
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new_symbols = dict(e for e in old_symbols.items()
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if e[0].symbol not in to_move)
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# Add placeholder symbols to prevent symbol versions from
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# going away completely.
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new_versions = set(versym.version for versym in new_symbols.keys())
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for missing_version in old_versions - new_versions:
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new_symbols[glibcsymbols.VersionedSymbol(
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placeholder, missing_version)] = 'F'
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glibcsymbols.replace_file(
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path, glibcsymbols.abilist_lines(new_symbols))
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moved_symbols.update(matching_symbols)
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def move_symbols(directory, files, symbols):
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"""Move SYMBOLS from FILES (a list of abilist file names) in DIRECTORY.
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SYMBOLS must be a set of strings.
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"""
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moved_symbols = {}
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for filename in files:
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move_symbols_1(os.path.join(directory, filename), symbols,
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moved_symbols)
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if moved_symbols:
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add_to_libc(directory, moved_symbols)
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def get_parser():
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"""Return an argument parser for this module."""
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('--only-linux', action='store_true',
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help='Restrict the operation to Linux abilists')
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parser.add_argument('symbols', help='name of the symbol to move',
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nargs='+')
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return parser
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def main(argv):
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"""The main entry point."""
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parser = get_parser()
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opts = parser.parse_args(argv)
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if opts.only_linux:
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sysdeps = 'sysdeps/unix/sysv/linux'
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else:
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sysdeps = 'sysdeps'
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symbols = frozenset(opts.symbols)
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for directory, dirs, files in os.walk(sysdeps):
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move_symbols(directory, [name for name in files
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if name != 'libc.abilist'
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and name.endswith('.abilist')], symbols)
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if __name__ == '__main__':
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main(sys.argv[1:])
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