| #!/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. |
| """ |
| |
| import optparse |
| import subprocess |
| import sys |
| |
| |
| def ShowModuleInitializers(binary): |
| """Gathers the module initializers for |binary| and symbolizes the addresses. |
| """ |
| initializers = GetModuleInitializers(binary) |
| if not initializers: |
| # atos will do work even if there are no addresses, so bail early. |
| return |
| symbols = SymbolizeAddresses(binary, initializers) |
| |
| print binary |
| for initializer in zip(initializers, symbols): |
| print '%s @ %s' % initializer |
| |
| |
| def GetModuleInitializers(binary): |
| """Parses the __DATA,__mod_init_func segment of |binary| and returns a list |
| of string hexadecimal addresses of the module initializers. |
| """ |
| # The -v flag will display the addresses in a usable form (as opposed to |
| # just its on-disk little-endian byte representation). |
| otool = ['otool', '-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): |
| """Given a |binary| and a list of |addresses|, symbolizes them using atos. |
| """ |
| atos = ['xcrun', 'atos', '-o', binary] + addresses |
| lines = subprocess.check_output(atos).strip().split('\n') |
| return lines |
| |
| |
| def Main(): |
| parser = optparse.OptionParser(usage='%prog filename') |
| opts, args = parser.parse_args() |
| if len(args) != 1: |
| parser.error('missing binary filename') |
| return 1 |
| |
| ShowModuleInitializers(args[0]) |
| return 0 |
| |
| if __name__ == '__main__': |
| sys.exit(Main()) |