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99 lines
3.4 KiB
99 lines
3.4 KiB
#!/usr/bin/env python
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# Copyright (c) 2017 Google Inc.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Checks names of global exports from a library."""
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import os.path
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import re
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import subprocess
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import sys
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PROG = 'check_symbol_exports'
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def command_output(cmd, directory):
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"""Runs a command in a directory and returns its standard output stream.
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Captures the standard error stream.
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Raises a RuntimeError if the command fails to launch or otherwise fails.
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"""
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p = subprocess.Popen(cmd,
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cwd=directory,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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universal_newlines=True)
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(stdout, _) = p.communicate()
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if p.returncode != 0:
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raise RuntimeError('Failed to run %s in %s' % (cmd, directory))
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return stdout
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def check_library(library):
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"""Scans the given library file for global exports. If all such
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exports are namespaced or begin with spv (in either C or C++ styles)
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then return 0. Otherwise emit a message and return 1."""
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# The pattern for a global symbol record
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symbol_pattern = re.compile(r'^[0-aA-Fa-f]+ g *F \.text.*[0-9A-Fa-f]+ +(.*)')
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# Ok patterns are as follows, assuming Itanium name mangling:
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# spv[A-Z] : extern "C" symbol starting with spv
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# _ZN : something in a namespace
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# _Z[0-9]+spv[A-Z_] : C++ symbol starting with spv[A-Z_]
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symbol_ok_pattern = re.compile(r'^(spv[A-Z]|_ZN|_Z[0-9]+spv[A-Z_])')
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# In addition, the following pattern allowlists global functions that are added
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# by the protobuf compiler:
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# - AddDescriptors_spvtoolsfuzz_2eproto()
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# - InitDefaults_spvtoolsfuzz_2eproto()
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symbol_allowlist_pattern = re.compile(r'_Z[0-9]+(InitDefaults|AddDescriptors)_spvtoolsfuzz_2eprotov')
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seen = set()
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result = 0
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for line in command_output(['objdump', '-t', library], '.').split('\n'):
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match = symbol_pattern.search(line)
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if match:
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symbol = match.group(1)
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if symbol not in seen:
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seen.add(symbol)
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#print("look at '{}'".format(symbol))
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if not (symbol_allowlist_pattern.match(symbol) or symbol_ok_pattern.match(symbol)):
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print('{}: error: Unescaped exported symbol: {}'.format(PROG, symbol))
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result = 1
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return result
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def main():
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import argparse
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parser = argparse.ArgumentParser(description='Check global names exported from a library')
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parser.add_argument('library', help='The static library to examine')
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args = parser.parse_args()
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if not os.path.isfile(args.library):
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print('{}: error: {} does not exist'.format(PROG, args.library))
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sys.exit(1)
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if os.name == 'posix':
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status = check_library(args.library)
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sys.exit(status)
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else:
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print('Passing test since not on Posix')
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sys.exit(0)
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if __name__ == '__main__':
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main()
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