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- #!/usr/bin/env python
- # Copyright (c) 2012 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.
- """
- Generates shim headers that mirror the directory structure of bundled headers,
- but just forward to the system ones.
- This allows seamless compilation against system headers with no changes
- to our source code.
- """
- import optparse
- import os.path
- import sys
- SHIM_TEMPLATE = """
- #if defined(OFFICIAL_BUILD)
- #error shim headers must not be used in official builds!
- #endif
- """
- def GeneratorMain(argv):
- parser = optparse.OptionParser()
- parser.add_option('--headers-root', action='append')
- parser.add_option('--define', action='append')
- parser.add_option('--output-directory')
- parser.add_option('--prefix', default='')
- parser.add_option('--use-include-next', action='store_true')
- parser.add_option('--outputs', action='store_true')
- parser.add_option('--generate', action='store_true')
- options, args = parser.parse_args(argv)
- if not options.headers_root:
- parser.error('Missing --headers-root parameter.')
- if not options.output_directory:
- parser.error('Missing --output-directory parameter.')
- if not args:
- parser.error('Missing arguments - header file names.')
- source_tree_root = os.path.abspath(
- os.path.join(os.path.dirname(__file__), '..', '..'))
- for root in options.headers_root:
- target_directory = os.path.join(
- options.output_directory,
- os.path.relpath(root, source_tree_root))
- if options.generate and not os.path.exists(target_directory):
- os.makedirs(target_directory)
- for header_spec in args:
- if ';' in header_spec:
- (header_filename,
- include_before,
- include_after) = header_spec.split(';', 2)
- else:
- header_filename = header_spec
- include_before = ''
- include_after = ''
- if options.outputs:
- yield os.path.join(target_directory, header_filename)
- if options.generate:
- header_path = os.path.join(target_directory, header_filename)
- header_dir = os.path.dirname(header_path)
- if not os.path.exists(header_dir):
- os.makedirs(header_dir)
- with open(header_path, 'w') as f:
- f.write(SHIM_TEMPLATE)
- if options.define:
- for define in options.define:
- key, value = define.split('=', 1)
- # This non-standard push_macro extension is supported
- # by compilers we support (GCC, clang).
- f.write('#pragma push_macro("%s")\n' % key)
- f.write('#undef %s\n' % key)
- f.write('#define %s %s\n' % (key, value))
- if include_before:
- for header in include_before.split(':'):
- f.write('#include %s\n' % header)
- include_target = options.prefix + header_filename
- if options.use_include_next:
- f.write('#include_next <%s>\n' % include_target)
- else:
- f.write('#include <%s>\n' % include_target)
- if include_after:
- for header in include_after.split(':'):
- f.write('#include %s\n' % header)
- if options.define:
- for define in options.define:
- key, value = define.split('=', 1)
- # This non-standard pop_macro extension is supported
- # by compilers we support (GCC, clang).
- f.write('#pragma pop_macro("%s")\n' % key)
- def DoMain(argv):
- return '\n'.join(GeneratorMain(argv))
- if __name__ == '__main__':
- DoMain(sys.argv[1:])
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