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#!/usr/bin/env python
#
# Copyright 2014 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.
"""Pack ARM relative relocations in a library (or copy unchanged).
If --enable-packing and --configuration-name=='Release', invoke the
relocation_packer tool to pack the .rel.dyn section in the given library
files. This step is inserted after the libraries are stripped. Packing
adds a new .android.rel.dyn section to the file and reduces the size of
.rel.dyn accordingly.
Currently packing only understands ARM32 shared libraries. For all other
architectures --enable-packing should be set to zero. In this case the
script copies files verbatim, with no attempt to pack relative relocations.
Any library listed in --exclude-packing-list is also copied verbatim,
irrespective of any --enable-packing setting. Typically this would be
'libchromium_android_linker.so'.
"""
import json
import optparse
import os
import shlex
import shutil
import sys
import tempfile
from util import build_utils
def PackArmLibraryRelocations(android_pack_relocations,
android_objcopy,
library_path,
output_path):
if not build_utils.IsTimeStale(output_path, [library_path]):
return
# Copy and add a 'NULL' .android.rel.dyn section for the packing tool.
with tempfile.NamedTemporaryFile() as stream:
stream.write('NULL')
stream.flush()
objcopy_command = [android_objcopy,
'--add-section', '.android.rel.dyn=%s' % stream.name,
library_path, output_path]
build_utils.CheckOutput(objcopy_command)
# Pack R_ARM_RELATIVE relocations.
pack_command = [android_pack_relocations, output_path]
build_utils.CheckOutput(pack_command)
def CopyArmLibraryUnchanged(library_path, output_path):
if not build_utils.IsTimeStale(output_path, [library_path]):
return
shutil.copy(library_path, output_path)
def main():
parser = optparse.OptionParser()
parser.add_option('--configuration-name',
default='Release',
help='Gyp configuration name (i.e. Debug, Release)')
parser.add_option('--enable-packing',
choices=['0', '1'],
help=('Pack relocations if 1 and configuration name is \'Release\','
' otherwise plain file copy'))
parser.add_option('--exclude-packing-list',
default='',
help='Names of any libraries explicitly not packed')
parser.add_option('--android-pack-relocations',
help='Path to the ARM relocations packer binary')
parser.add_option('--android-objcopy',
help='Path to the toolchain\'s objcopy binary')
parser.add_option('--stripped-libraries-dir',
help='Directory for stripped libraries')
parser.add_option('--packed-libraries-dir',
help='Directory for packed libraries')
parser.add_option('--libraries-file',
help='Path to json file containing list of libraries')
parser.add_option('--stamp', help='Path to touch on success')
options, _ = parser.parse_args()
enable_packing = (options.enable_packing == '1' and
options.configuration_name == 'Release')
exclude_packing_set = set(shlex.split(options.exclude_packing_list))
with open(options.libraries_file, 'r') as libfile:
libraries = json.load(libfile)
build_utils.MakeDirectory(options.packed_libraries_dir)
for library in libraries:
library_path = os.path.join(options.stripped_libraries_dir, library)
output_path = os.path.join(options.packed_libraries_dir, library)
if enable_packing and library not in exclude_packing_set:
PackArmLibraryRelocations(options.android_pack_relocations,
options.android_objcopy,
library_path,
output_path)
else:
CopyArmLibraryUnchanged(library_path, output_path)
if options.stamp:
build_utils.Touch(options.stamp)
return 0
if __name__ == '__main__':
sys.exit(main())
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