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#!/usr/bin/python3
# Processing of symbols and abilist files.
# Copyright (C) 2020-2021 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
"""Symbol processing for glibc."""
import os
def replace_file(path, new_contents):
"""Atomically replace PATH with lines from NEW_CONTENTS.
NEW_CONTENTS must be a sequence of strings.
"""
temppath = path + 'T'
with open(temppath, 'w') as out:
for line in new_contents:
out.write(line)
os.rename(temppath, path)
class VersionedSymbol:
"""A combination of a symbol and its version."""
def __init__(self, symbol, version):
"""Construct a new versioned symbol."""
assert symbol
assert version
self.symbol = symbol
self.version = version
def __str__(self):
return self.symbol + '@' + self.version
def __eq__(self, other):
return self.symbol == other.symbol and self.version == other.version
def __hash__(self):
return hash(self.symbol) ^ hash(self.version)
def read_abilist(path):
"""Read the abilist file at PATH.
Return a dictionary from VersionedSymbols to their flags (as
strings).
"""
result = {}
with open(path) as inp:
for line in inp:
version, symbol, flags = line.strip().split(' ', 2)
versym = VersionedSymbol(symbol, version)
if versym in result:
raise IOError("{}: duplicate symbol {}".format(path, versym))
result[versym] = flags
return result
def abilist_lines(symbols):
"""Build the abilist file contents (as a list of lines).
SYMBOLS is a dictionary from VersionedSymbols to their flags.
"""
result = []
for versym, flags in symbols.items():
result.append('{} {} {}\n'.format(
versym.version, versym.symbol, flags))
result.sort()
return result
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