src/mapi/glapi/gen/remap_helper.py

   1
   2 # Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
   3 # All Rights Reserved.
   4 #
   5 # This is based on extension_helper.py by Ian Romanick.
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a
   8 # copy of this software and associated documentation files (the "Software"),
   9 # to deal in the Software without restriction, including without limitation
  10 # on the rights to use, copy, modify, merge, publish, distribute, sub
  11 # license, and/or sell copies of the Software, and to permit persons to whom
  12 # the Software is furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice (including the next
  15 # paragraph) shall be included in all copies or substantial portions of the
  16 # Software.
  17 #
  18 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 # FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  21 # IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  24 # IN THE SOFTWARE.
  25
  26 import argparse
  27
  28 import license
  29 import gl_XML
  30
  31
  32 def get_function_spec(func):
  33     sig = ""
  34     # derive parameter signature
  35     for p in func.parameterIterator():
  36         if p.is_padding:
  37             continue
  38         # FIXME: This is a *really* ugly hack. :(
  39         tn = p.type_expr.get_base_type_node()
  40         if p.is_pointer():
  41             sig += 'p'
  42         elif tn.integer:
  43             sig += 'i'
  44         elif tn.size == 4:
  45             sig += 'f'
  46         else:
  47             sig += 'd'
  48
  49     spec = [sig]
  50     for ent in func.entry_points:
  51         spec.append("gl" + ent)
  52
  53     # spec is terminated by an empty string
  54     spec.append('')
  55
  56     return spec
  57
  58
  59 class PrintGlRemap(gl_XML.gl_print_base):
  60     def __init__(self):
  61         gl_XML.gl_print_base.__init__(self)
  62
  63         self.name = "remap_helper.py (from Mesa)"
  64         self.license = license.bsd_license_template % ("Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>", "Chia-I Wu")
  65         return
  66
  67
  68     def printRealHeader(self):
  69         print '#include "main/dispatch.h"'
  70         print '#include "main/remap.h"'
  71         print ''
  72         return
  73
  74
  75     def printBody(self, api):
  76         pool_indices = {}
  77
  78         print '/* this is internal to remap.c */'
  79         print '#ifndef need_MESA_remap_table'
  80         print '#error Only remap.c should include this file!'
  81         print '#endif /* need_MESA_remap_table */'
  82         print ''
  83
  84         print ''
  85         print 'static const char _mesa_function_pool[] ='
  86
  87         # output string pool
  88         index = 0;
  89         for f in api.functionIterateAll():
  90             pool_indices[f] = index
  91
  92             spec = get_function_spec(f)
  93
  94             # a function has either assigned offset, fixed offset,
  95             # or no offset
  96             if f.assign_offset:
  97                 comments = "will be remapped"
  98             elif f.offset > 0:
  99                 comments = "offset %d" % f.offset
 100             else:
 101                 comments = "dynamic"
 102
 103             print '   /* _mesa_function_pool[%d]: %s (%s) */' \
 104                             % (index, f.name, comments)
 105             for line in spec:
 106                 print '   "%s\\0"' % line
 107                 index += len(line) + 1
 108         print '   ;'
 109         print ''
 110
 111         print '/* these functions need to be remapped */'
 112         print 'static const struct gl_function_pool_remap MESA_remap_table_functions[] = {'
 113         # output all functions that need to be remapped
 114         # iterate by offsets so that they are sorted by remap indices
 115         for f in api.functionIterateByOffset():
 116             if not f.assign_offset:
 117                 continue
 118             print '   { %5d, %s_remap_index },' \
 119                             % (pool_indices[f], f.name)
 120         print '   {    -1, -1 }'
 121         print '};'
 122         print ''
 123         return
 124
 125
 126 def _parser():
 127     """Parse input options and return a namsepace."""
 128     parser = argparse.ArgumentParser()
 129     parser.add_argument('-f', '--filename',
 130                         default="gl_API.xml",
 131                         metavar="input_file_name",
 132                         dest='file_name',
 133                         help="An xml description file.")
 134     return parser.parse_args()
 135
 136
 137 def main():
 138     """Main function."""
 139     args = _parser()
 140
 141     api = gl_XML.parse_GL_API(args.file_name)
 142
 143     printer = PrintGlRemap()
 144     printer.Print(api)
 145
 146
 147 if __name__ == '__main__':
 148     main()