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      1 #!/usr/bin/env python
      2 #
      3 # Copyright 2013 the V8 project authors. All rights reserved.
      4 # Redistribution and use in source and binary forms, with or without
      5 # modification, are permitted provided that the following conditions are
      6 # met:
      7 #
      8 #     * Redistributions of source code must retain the above copyright
      9 #       notice, this list of conditions and the following disclaimer.
     10 #     * Redistributions in binary form must reproduce the above
     11 #       copyright notice, this list of conditions and the following
     12 #       disclaimer in the documentation and/or other materials provided
     13 #       with the distribution.
     14 #     * Neither the name of Google Inc. nor the names of its
     15 #       contributors may be used to endorse or promote products derived
     16 #       from this software without specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 """
     31 Generates shim headers that mirror the directory structure of bundled headers,
     32 but just forward to the system ones.
     33 
     34 This allows seamless compilation against system headers with no changes
     35 to our source code.
     36 """
     37 
     38 
     39 import optparse
     40 import os.path
     41 import sys
     42 
     43 
     44 def GeneratorMain(argv):
     45   parser = optparse.OptionParser()
     46   parser.add_option('--headers-root', action='append')
     47   parser.add_option('--define', action='append')
     48   parser.add_option('--output-directory')
     49   parser.add_option('--prefix', default='')
     50   parser.add_option('--use-include-next', action='store_true')
     51   parser.add_option('--outputs', action='store_true')
     52   parser.add_option('--generate', action='store_true')
     53 
     54   options, args = parser.parse_args(argv)
     55 
     56   if not options.headers_root:
     57     parser.error('Missing --headers-root parameter.')
     58   if not options.output_directory:
     59     parser.error('Missing --output-directory parameter.')
     60   if not args:
     61     parser.error('Missing arguments - header file names.')
     62 
     63   source_tree_root = os.path.abspath(
     64     os.path.join(os.path.dirname(__file__), '..', '..'))
     65 
     66   for root in options.headers_root:
     67     target_directory = os.path.join(
     68       options.output_directory,
     69       os.path.relpath(root, source_tree_root))
     70     if options.generate and not os.path.exists(target_directory):
     71       os.makedirs(target_directory)
     72 
     73     for header_spec in args:
     74       if ';' in header_spec:
     75         (header_filename,
     76          include_before,
     77          include_after) = header_spec.split(';', 2)
     78       else:
     79         header_filename = header_spec
     80         include_before = ''
     81         include_after = ''
     82       if options.outputs:
     83         yield os.path.join(target_directory, header_filename)
     84       if options.generate:
     85         with open(os.path.join(target_directory, header_filename), 'w') as f:
     86           if options.define:
     87             for define in options.define:
     88               key, value = define.split('=', 1)
     89               # This non-standard push_macro extension is supported
     90               # by compilers we support (GCC, clang).
     91               f.write('#pragma push_macro("%s")\n' % key)
     92               f.write('#undef %s\n' % key)
     93               f.write('#define %s %s\n' % (key, value))
     94 
     95           if include_before:
     96             for header in include_before.split(':'):
     97               f.write('#include %s\n' % header)
     98 
     99           include_target = options.prefix + header_filename
    100           if options.use_include_next:
    101             f.write('#include_next <%s>\n' % include_target)
    102           else:
    103             f.write('#include <%s>\n' % include_target)
    104 
    105           if include_after:
    106             for header in include_after.split(':'):
    107               f.write('#include %s\n' % header)
    108 
    109           if options.define:
    110             for define in options.define:
    111               key, value = define.split('=', 1)
    112               # This non-standard pop_macro extension is supported
    113               # by compilers we support (GCC, clang).
    114               f.write('#pragma pop_macro("%s")\n' % key)
    115 
    116 
    117 def DoMain(argv):
    118   return '\n'.join(GeneratorMain(argv))
    119 
    120 
    121 if __name__ == '__main__':
    122   DoMain(sys.argv[1:])
    123