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| 1 #!/usr/bin/env python | |
| 2 # | |
| 3 # Copyright 2014 The Chromium Authors. All rights reserved. | |
| 4 # Use of this source code is governed by a BSD-style license that can be | |
| 5 # found in the LICENSE file. | |
| 6 | |
| 7 """Pack ARM relative relocations in a library (or copy unchanged). | |
| 8 | |
| 9 If --enable-packing, invoke the relocation_packer tool to pack the .rel.dyn | |
| 10 section in the given library files. This step is inserted after the libraries | |
| 11 are stripped. Packing adds a new .android.rel.dyn section to the file and | |
| 12 reduces the size of .rel.dyn accordingly. | |
| 13 | |
| 14 Currently packing only understands ARM32 shared libraries. For all other | |
| 15 architectures --enable-packing should be set to zero. In this case the | |
| 16 script copies files verbatim, with no attempt to pack relative relocations. | |
| 17 | |
| 18 Any library listed in --exclude-packing-list is also copied verbatim, | |
| 19 irrespective of any --enable-packing setting. Typically this would be | |
| 20 'libchromium_android_linker.so'. | |
| 21 """ | |
| 22 | |
| 23 import json | |
| 24 import optparse | |
| 25 import os | |
| 26 import shlex | |
| 27 import shutil | |
| 28 import sys | |
| 29 import tempfile | |
| 30 | |
| 31 from util import build_utils | |
| 32 | |
| 33 def PackArmLibraryRelocations(android_pack_relocations, | |
| 34 android_objcopy, | |
| 35 library_path, | |
| 36 output_path): | |
| 37 if not build_utils.IsTimeStale(output_path, [library_path]): | |
| 38 return | |
| 39 | |
| 40 # Copy and add a 'NULL' .android.rel.dyn section for the packing tool. | |
| 41 with tempfile.NamedTemporaryFile() as stream: | |
| 42 stream.write('NULL') | |
| 43 stream.flush() | |
| 44 objcopy_command = [android_objcopy, | |
| 45 '--add-section', '.android.rel.dyn=%s' % stream.name, | |
| 46 library_path, output_path] | |
| 47 build_utils.CheckOutput(objcopy_command) | |
| 48 | |
| 49 # Pack R_ARM_RELATIVE relocations. | |
| 50 pack_command = [android_pack_relocations, output_path] | |
| 51 build_utils.CheckOutput(pack_command) | |
| 52 | |
| 53 | |
| 54 def CopyArmLibraryUnchanged(library_path, output_path): | |
| 55 if not build_utils.IsTimeStale(output_path, [library_path]): | |
| 56 return | |
| 57 | |
| 58 shutil.copy(library_path, output_path) | |
| 59 | |
| 60 | |
| 61 def main(): | |
| 62 parser = optparse.OptionParser() | |
| 63 | |
| 64 parser.add_option('--enable-packing', | |
| 65 choices=['0', '1'], | |
| 66 help='Pack relocations if 1, otherwise plain file copy') | |
| 67 parser.add_option('--exclude-packing-list', | |
| 68 default='', | |
| 69 help='Names of any libraries explicitly not packed') | |
| 70 parser.add_option('--android-pack-relocations', | |
| 71 help='Path to the ARM relocations packer binary') | |
| 72 parser.add_option('--android-objcopy', | |
| 73 help='Path to the toolchain\'s objcopy binary') | |
| 74 parser.add_option('--stripped-libraries-dir', | |
| 75 help='Directory for stripped libraries') | |
| 76 parser.add_option('--packed-libraries-dir', | |
| 77 help='Directory for packed libraries') | |
| 78 parser.add_option('--libraries-file', | |
| 79 help='Path to json file containing list of libraries') | |
| 80 parser.add_option('--stamp', help='Path to touch on success') | |
| 81 | |
| 82 options, _ = parser.parse_args() | |
| 83 enable_packing = options.enable_packing == '1' | |
| 84 exclude_packing_set = set(shlex.split(options.exclude_packing_list)) | |
| 85 | |
| 86 with open(options.libraries_file, 'r') as libfile: | |
| 87 libraries = json.load(libfile) | |
| 88 | |
| 89 for library in libraries: | |
| 90 library_path = os.path.join(options.stripped_libraries_dir, library) | |
| 91 output_path = os.path.join(options.packed_libraries_dir, library) | |
| 92 | |
| 93 if enable_packing and library not in exclude_packing_set: | |
| 94 PackArmLibraryRelocations(options.android_pack_relocations, | |
| 95 options.android_objcopy, | |
| 96 library_path, | |
| 97 output_path) | |
| 98 else: | |
| 99 CopyArmLibraryUnchanged(library_path, output_path) | |
| 100 | |
| 101 if options.stamp: | |
| 102 build_utils.Touch(options.stamp) | |
| 103 | |
| 104 return 0 | |
| 105 | |
| 106 | |
| 107 if __name__ == '__main__': | |
| 108 sys.exit(main()) | |
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Chromium Code Reviews
Issue 370633002:
Revert 281286 "Add gyp machinery to build with packed ARM relati..." (Closed)
Base URL: svn://svn.chromium.org/chrome/