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- #!/usr/bin/env python
- # Copyright 2016 The Chromium Authors. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- """
- Prints the contents of the __DATA,__mod_init_func section of a Mach-O image.
- Usage:
- tools/mac/show_mod_init_func.py out/gn/Chromium\ Framework.unstripped
- This is meant to be used on a Mach-O executable. If a dSYM is present, use
- dump-static-initializers.py instead.
- """
- from __future__ import print_function
- import optparse
- import os
- import subprocess
- import sys
- def ShowModuleInitializers(binary, xcode_path):
- """Gathers the module initializers for |binary| and symbolizes the addresses.
- """
- initializers = GetModuleInitializers(binary, xcode_path)
- if not initializers:
- # atos will do work even if there are no addresses, so bail early.
- return
- symbols = SymbolizeAddresses(binary, initializers, xcode_path)
- print(binary)
- for initializer in zip(initializers, symbols):
- print('%s @ %s' % initializer)
- def GetModuleInitializers(binary, xcode_path):
- """Parses the __DATA,__mod_init_func segment of |binary| and returns a list
- of string hexadecimal addresses of the module initializers.
- """
- if xcode_path:
- otool_path = os.path.join(xcode_path, 'Contents', 'Developer',
- 'Toolchains', 'XcodeDefault.xctoolchain', 'usr', 'bin', 'otool')
- else:
- otool_path = 'otool'
- # The -v flag will display the addresses in a usable form (as opposed to
- # just its on-disk little-endian byte representation).
- otool = [otool_path, '-v', '-s', '__DATA', '__mod_init_func', binary]
- lines = subprocess.check_output(otool).strip().split('\n')
- # Skip the first two header lines and then get the address of the
- # initializer in the second column. The first address is the address
- # of the initializer pointer.
- # out/gn/Chromium Framework.unstripped:
- # Contents of (__DATA,__mod_init_func) section
- # 0x0000000008761498 0x000000000385d120
- return [line.split(' ')[1] for line in lines[2:]]
- def SymbolizeAddresses(binary, addresses, xcode_path):
- """Given a |binary| and a list of |addresses|, symbolizes them using atos.
- """
- if xcode_path:
- atos_path = os.path.join(xcode_path, 'Contents', 'Developer', 'usr',
- 'bin', 'atos')
- else:
- atos_path = 'atos'
- atos = [atos_path, '-o', binary] + addresses
- lines = subprocess.check_output(atos).strip().split('\n')
- return lines
- def Main():
- parser = optparse.OptionParser(usage='%prog filename')
- parser.add_option(
- '--xcode-path',
- default=None,
- help='Optional custom path to xcode binaries. By default, commands such '
- 'as `otool` will be run as `/usr/bin/otool` which only works '
- 'if there is a system-wide install of Xcode.')
- opts, args = parser.parse_args()
- if len(args) != 1:
- parser.error('missing binary filename')
- return 1
- ShowModuleInitializers(args[0], opts.xcode_path)
- return 0
- if __name__ == '__main__':
- sys.exit(Main())
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