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.
7 """Pack ARM relative relocations in a library (or copy unchanged).
9 If --enable-packing and --configuration-name=='Release', invoke the
10 relocation_packer tool to pack the .rel.dyn section in the given library
11 files. This step is inserted after the libraries are stripped. Packing
12 adds a new .android.rel.dyn section to the file and reduces the size of
15 Currently packing only understands ARM32 shared libraries. For all other
16 architectures --enable-packing should be set to zero. In this case the
17 script copies files verbatim, with no attempt to pack relative relocations.
19 Any library listed in --exclude-packing-list is also copied verbatim,
20 irrespective of any --enable-packing setting. Typically this would be
21 'libchromium_android_linker.so'.
32 from util import build_utils
34 def PackArmLibraryRelocations(android_pack_relocations,
38 if not build_utils.IsTimeStale(output_path, [library_path]):
41 # Copy and add a 'NULL' .android.rel.dyn section for the packing tool.
42 with tempfile.NamedTemporaryFile() as stream:
45 objcopy_command = [android_objcopy,
46 '--add-section', '.android.rel.dyn=%s' % stream.name,
47 library_path, output_path]
48 build_utils.CheckOutput(objcopy_command)
50 # Pack R_ARM_RELATIVE relocations.
51 pack_command = [android_pack_relocations, output_path]
52 build_utils.CheckOutput(pack_command)
55 def CopyArmLibraryUnchanged(library_path, output_path):
56 if not build_utils.IsTimeStale(output_path, [library_path]):
59 shutil.copy(library_path, output_path)
63 parser = optparse.OptionParser()
65 parser.add_option('--configuration-name',
67 help='Gyp configuration name (i.e. Debug, Release)')
68 parser.add_option('--enable-packing',
70 help=('Pack relocations if 1 and configuration name is \'Release\','
71 ' otherwise plain file copy'))
72 parser.add_option('--exclude-packing-list',
74 help='Names of any libraries explicitly not packed')
75 parser.add_option('--android-pack-relocations',
76 help='Path to the ARM relocations packer binary')
77 parser.add_option('--android-objcopy',
78 help='Path to the toolchain\'s objcopy binary')
79 parser.add_option('--stripped-libraries-dir',
80 help='Directory for stripped libraries')
81 parser.add_option('--packed-libraries-dir',
82 help='Directory for packed libraries')
83 parser.add_option('--libraries-file',
84 help='Path to json file containing list of libraries')
85 parser.add_option('--stamp', help='Path to touch on success')
87 options, _ = parser.parse_args()
88 enable_packing = (options.enable_packing == '1' and
89 options.configuration_name == 'Release')
90 exclude_packing_set = set(shlex.split(options.exclude_packing_list))
92 with open(options.libraries_file, 'r') as libfile:
93 libraries = json.load(libfile)
95 build_utils.MakeDirectory(options.packed_libraries_dir)
97 for library in libraries:
98 library_path = os.path.join(options.stripped_libraries_dir, library)
99 output_path = os.path.join(options.packed_libraries_dir, library)
101 if enable_packing and library not in exclude_packing_set:
102 PackArmLibraryRelocations(options.android_pack_relocations,
103 options.android_objcopy,
107 CopyArmLibraryUnchanged(library_path, output_path)
110 build_utils.Touch(options.stamp)
115 if __name__ == '__main__':