src/mapi/mapi_abi.py

   1
   2 # Mesa 3-D graphics library
   3 #
   4 # Copyright (C) 2010 LunarG Inc.
   5 #
   6 # Permission is hereby granted, free of charge, to any person obtaining a
   7 # copy of this software and associated documentation files (the "Software"),
   8 # to deal in the Software without restriction, including without limitation
   9 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10 # and/or sell copies of the Software, and to permit persons to whom the
  11 # Software is furnished to do so, subject to the following conditions:
  12 #
  13 # The above copyright notice and this permission notice shall be included
  14 # in all copies or substantial portions of the Software.
  15 #
  16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19 # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22 # DEALINGS IN THE SOFTWARE.
  23 #
  24 # Authors:
  25 #    Chia-I Wu <olv@lunarg.com>
  26
  27 import sys
  28 # make it possible to import glapi
  29 import os
  30 GLAPI = os.path.join(".", os.path.dirname(sys.argv[0]), "glapi/gen")
  31 sys.path.append(GLAPI)
  32
  33 import re
  34 from optparse import OptionParser
  35 import gl_XML
  36 import glX_XML
  37
  38
  39 # number of dynamic entries
  40 ABI_NUM_DYNAMIC_ENTRIES = 256
  41
  42 class ABIEntry(object):
  43     """Represent an ABI entry."""
  44
  45     _match_c_param = re.compile(
  46             '^(?P<type>[\w\s*]+?)(?P<name>\w+)(\[(?P<array>\d+)\])?$')
  47
  48     def __init__(self, cols, attrs, xml_data = None):
  49         self._parse(cols)
  50
  51         self.slot = attrs['slot']
  52         self.hidden = attrs['hidden']
  53         self.alias = attrs['alias']
  54         self.handcode = attrs['handcode']
  55         self.xml_data = xml_data
  56
  57     def c_prototype(self):
  58         return '%s %s(%s)' % (self.c_return(), self.name, self.c_params())
  59
  60     def c_return(self):
  61         ret = self.ret
  62         if not ret:
  63             ret = 'void'
  64
  65         return ret
  66
  67     def c_params(self):
  68         """Return the parameter list used in the entry prototype."""
  69         c_params = []
  70         for t, n, a in self.params:
  71             sep = '' if t.endswith('*') else ' '
  72             arr = '[%d]' % a if a else ''
  73             c_params.append(t + sep + n + arr)
  74         if not c_params:
  75             c_params.append('void')
  76
  77         return ", ".join(c_params)
  78
  79     def c_args(self):
  80         """Return the argument list used in the entry invocation."""
  81         c_args = []
  82         for t, n, a in self.params:
  83             c_args.append(n)
  84
  85         return ", ".join(c_args)
  86
  87     def _parse(self, cols):
  88         ret = cols.pop(0)
  89         if ret == 'void':
  90             ret = None
  91
  92         name = cols.pop(0)
  93
  94         params = []
  95         if not cols:
  96             raise Exception(cols)
  97         elif len(cols) == 1 and cols[0] == 'void':
  98             pass
  99         else:
 100             for val in cols:
 101                 params.append(self._parse_param(val))
 102
 103         self.ret = ret
 104         self.name = name
 105         self.params = params
 106
 107     def _parse_param(self, c_param):
 108         m = self._match_c_param.match(c_param)
 109         if not m:
 110             raise Exception('unrecognized param ' + c_param)
 111
 112         c_type = m.group('type').strip()
 113         c_name = m.group('name')
 114         c_array = m.group('array')
 115         c_array = int(c_array) if c_array else 0
 116
 117         return (c_type, c_name, c_array)
 118
 119     def __str__(self):
 120         return self.c_prototype()
 121
 122     def __cmp__(self, other):
 123         # compare slot, alias, and then name
 124         res = cmp(self.slot, other.slot)
 125         if not res:
 126             if not self.alias:
 127                 res = -1
 128             elif not other.alias:
 129                 res = 1
 130
 131             if not res:
 132                 res = cmp(self.name, other.name)
 133
 134         return res
 135
 136 def abi_parse_xml(xml):
 137     """Parse a GLAPI XML file for ABI entries."""
 138     api = gl_XML.parse_GL_API(xml, glX_XML.glx_item_factory())
 139
 140     entry_dict = {}
 141     for func in api.functionIterateByOffset():
 142         # make sure func.name appear first
 143         entry_points = func.entry_points[:]
 144         entry_points.remove(func.name)
 145         entry_points.insert(0, func.name)
 146
 147         for name in entry_points:
 148             attrs = {
 149                     'slot': func.offset,
 150                     'hidden': not func.is_static_entry_point(name),
 151                     'alias': None if name == func.name else func.name,
 152                     'handcode': bool(func.has_different_protocol(name)),
 153             }
 154
 155             # post-process attrs
 156             if attrs['alias']:
 157                 try:
 158                     alias = entry_dict[attrs['alias']]
 159                 except KeyError:
 160                     raise Exception('failed to alias %s' % attrs['alias'])
 161                 if alias.alias:
 162                     raise Exception('recursive alias %s' % ent.name)
 163                 attrs['alias'] = alias
 164             if attrs['handcode']:
 165                 attrs['handcode'] = func.static_glx_name(name)
 166             else:
 167                 attrs['handcode'] = None
 168
 169             if entry_dict.has_key(name):
 170                 raise Exception('%s is duplicated' % (name))
 171
 172             cols = []
 173             cols.append(func.return_type)
 174             cols.append(name)
 175             params = func.get_parameter_string(name)
 176             cols.extend([p.strip() for p in params.split(',')])
 177
 178             ent = ABIEntry(cols, attrs, func)
 179             entry_dict[ent.name] = ent
 180
 181     entries = entry_dict.values()
 182     entries.sort()
 183
 184     return entries
 185
 186 def abi_parse_line(line):
 187     cols = [col.strip() for col in line.split(',')]
 188
 189     attrs = {
 190             'slot': -1,
 191             'hidden': False,
 192             'alias': None,
 193             'handcode': None,
 194     }
 195
 196     # extract attributes from the first column
 197     vals = cols[0].split(':')
 198     while len(vals) > 1:
 199         val = vals.pop(0)
 200         if val.startswith('slot='):
 201             attrs['slot'] = int(val[5:])
 202         elif val == 'hidden':
 203             attrs['hidden'] = True
 204         elif val.startswith('alias='):
 205             attrs['alias'] = val[6:]
 206         elif val.startswith('handcode='):
 207             attrs['handcode'] = val[9:]
 208         elif not val:
 209             pass
 210         else:
 211             raise Exception('unknown attribute %s' % val)
 212     cols[0] = vals[0]
 213
 214     return (attrs, cols)
 215
 216 def abi_parse(filename):
 217     """Parse a CSV file for ABI entries."""
 218     fp = open(filename) if filename != '-' else sys.stdin
 219     lines = [line.strip() for line in fp.readlines()
 220             if not line.startswith('#') and line.strip()]
 221
 222     entry_dict = {}
 223     next_slot = 0
 224     for line in lines:
 225         attrs, cols = abi_parse_line(line)
 226
 227         # post-process attributes
 228         if attrs['alias']:
 229             try:
 230                 alias = entry_dict[attrs['alias']]
 231             except KeyError:
 232                 raise Exception('failed to alias %s' % attrs['alias'])
 233             if alias.alias:
 234                 raise Exception('recursive alias %s' % ent.name)
 235             slot = alias.slot
 236             attrs['alias'] = alias
 237         else:
 238             slot = next_slot
 239             next_slot += 1
 240
 241         if attrs['slot'] < 0:
 242             attrs['slot'] = slot
 243         elif attrs['slot'] != slot:
 244             raise Exception('invalid slot in %s' % (line))
 245
 246         ent = ABIEntry(cols, attrs)
 247         if entry_dict.has_key(ent.name):
 248             raise Exception('%s is duplicated' % (ent.name))
 249         entry_dict[ent.name] = ent
 250
 251     entries = entry_dict.values()
 252     entries.sort()
 253
 254     return entries
 255
 256 def abi_sanity_check(entries):
 257     if not entries:
 258         return
 259
 260     all_names = []
 261     last_slot = entries[-1].slot
 262     i = 0
 263     for slot in xrange(last_slot + 1):
 264         if entries[i].slot != slot:
 265             raise Exception('entries are not ordered by slots')
 266         if entries[i].alias:
 267             raise Exception('first entry of slot %d aliases %s'
 268                     % (slot, entries[i].alias.name))
 269         handcode = None
 270         while i < len(entries) and entries[i].slot == slot:
 271             ent = entries[i]
 272             if not handcode and ent.handcode:
 273                 handcode = ent.handcode
 274             elif ent.handcode != handcode:
 275                 raise Exception('two aliases with handcode %s != %s',
 276                         ent.handcode, handcode)
 277
 278             if ent.name in all_names:
 279                 raise Exception('%s is duplicated' % (ent.name))
 280             if ent.alias and ent.alias.name not in all_names:
 281                 raise Exception('failed to alias %s' % (ent.alias.name))
 282             all_names.append(ent.name)
 283             i += 1
 284     if i < len(entries):
 285         raise Exception('there are %d invalid entries' % (len(entries) - 1))
 286
 287 class ABIPrinter(object):
 288     """MAPI Printer"""
 289
 290     def __init__(self, entries):
 291         self.entries = entries
 292
 293         # sort entries by their names
 294         self.entries_sorted_by_names = self.entries[:]
 295         self.entries_sorted_by_names.sort(lambda x, y: cmp(x.name, y.name))
 296
 297         self.indent = ' ' * 3
 298         self.noop_warn = 'noop_warn'
 299         self.noop_generic = 'noop_generic'
 300         self.current_get = 'entry_current_get'
 301
 302         self.api_defines = []
 303         self.api_headers = ['"KHR/khrplatform.h"']
 304         self.api_call = 'KHRONOS_APICALL'
 305         self.api_entry = 'KHRONOS_APIENTRY'
 306         self.api_attrs = 'KHRONOS_APIATTRIBUTES'
 307
 308         self.c_header = ''
 309
 310         self.lib_need_table_size = True
 311         self.lib_need_noop_array = True
 312         self.lib_need_stubs = True
 313         self.lib_need_all_entries = True
 314         self.lib_need_non_hidden_entries = False
 315
 316     def c_notice(self):
 317         return '/* This file is automatically generated by mapi_abi.py.  Do not modify. */'
 318
 319     def c_public_includes(self):
 320         """Return includes of the client API headers."""
 321         defines = ['#define ' + d for d in self.api_defines]
 322         includes = ['#include ' + h for h in self.api_headers]
 323         return "\n".join(defines + includes)
 324
 325     def need_entry_point(self, ent):
 326         """Return True if an entry point is needed for the entry."""
 327         # non-handcode hidden aliases may share the entry they alias
 328         use_alias = (ent.hidden and ent.alias and not ent.handcode)
 329         return not use_alias
 330
 331     def c_public_declarations(self, prefix):
 332         """Return the declarations of public entry points."""
 333         decls = []
 334         for ent in self.entries:
 335             if not self.need_entry_point(ent):
 336                 continue
 337             export = self.api_call if not ent.hidden else ''
 338             decls.append(self._c_decl(ent, prefix, True, export) + ';')
 339
 340         return "\n".join(decls)
 341
 342     def c_mapi_table(self):
 343         """Return defines of the dispatch table size."""
 344         num_static_entries = self.entries[-1].slot + 1
 345         return ('#define MAPI_TABLE_NUM_STATIC %d\n' + \
 346                 '#define MAPI_TABLE_NUM_DYNAMIC %d') % (
 347                         num_static_entries, ABI_NUM_DYNAMIC_ENTRIES)
 348
 349     def _c_function(self, ent, prefix, mangle=False, stringify=False):
 350         """Return the function name of an entry."""
 351         formats = {
 352                 True: { True: '%s_STR(%s)', False: '%s(%s)' },
 353                 False: { True: '"%s%s"', False: '%s%s' },
 354         }
 355         fmt = formats[prefix.isupper()][stringify]
 356         name = ent.name
 357         if mangle and ent.hidden:
 358             name = '_dispatch_stub_' + str(ent.slot)
 359         return fmt % (prefix, name)
 360
 361     def _c_function_call(self, ent, prefix):
 362         """Return the function name used for calling."""
 363         if ent.handcode:
 364             # _c_function does not handle this case
 365             formats = { True: '%s(%s)', False: '%s%s' }
 366             fmt = formats[prefix.isupper()]
 367             name = fmt % (prefix, ent.handcode)
 368         elif self.need_entry_point(ent):
 369             name = self._c_function(ent, prefix, True)
 370         else:
 371             name = self._c_function(ent.alias, prefix, True)
 372         return name
 373
 374     def _c_decl(self, ent, prefix, mangle=False, export=''):
 375         """Return the C declaration for the entry."""
 376         decl = '%s %s %s(%s)' % (ent.c_return(), self.api_entry,
 377                 self._c_function(ent, prefix, mangle), ent.c_params())
 378         if export:
 379             decl = export + ' ' + decl
 380         if self.api_attrs:
 381             decl += ' ' + self.api_attrs
 382
 383         return decl
 384
 385     def _c_cast(self, ent):
 386         """Return the C cast for the entry."""
 387         cast = '%s (%s *)(%s)' % (
 388                 ent.c_return(), self.api_entry, ent.c_params())
 389
 390         return cast
 391
 392     def c_public_dispatches(self, prefix, no_hidden):
 393         """Return the public dispatch functions."""
 394         dispatches = []
 395         for ent in self.entries:
 396             if ent.hidden and no_hidden:
 397                 continue
 398
 399             if not self.need_entry_point(ent):
 400                 continue
 401
 402             export = self.api_call if not ent.hidden else ''
 403
 404             proto = self._c_decl(ent, prefix, True, export)
 405             cast = self._c_cast(ent)
 406
 407             ret = ''
 408             if ent.ret:
 409                 ret = 'return '
 410             stmt1 = self.indent
 411             stmt1 += 'const struct _glapi_table *_tbl = %s();' % (
 412                     self.current_get)
 413             stmt2 = self.indent
 414             stmt2 += 'mapi_func _func = ((const mapi_func *) _tbl)[%d];' % (
 415                     ent.slot)
 416             stmt3 = self.indent
 417             stmt3 += '%s((%s) _func)(%s);' % (ret, cast, ent.c_args())
 418
 419             disp = '%s\n{\n%s\n%s\n%s\n}' % (proto, stmt1, stmt2, stmt3)
 420
 421             if ent.handcode:
 422                 disp = '#if 0\n' + disp + '\n#endif'
 423
 424             dispatches.append(disp)
 425
 426         return '\n\n'.join(dispatches)
 427
 428     def c_public_initializer(self, prefix):
 429         """Return the initializer for public dispatch functions."""
 430         names = []
 431         for ent in self.entries:
 432             if ent.alias:
 433                 continue
 434
 435             name = '%s(mapi_func) %s' % (self.indent,
 436                     self._c_function_call(ent, prefix))
 437             names.append(name)
 438
 439         return ',\n'.join(names)
 440
 441     def c_stub_string_pool(self):
 442         """Return the string pool for use by stubs."""
 443         # sort entries by their names
 444         sorted_entries = self.entries[:]
 445         sorted_entries.sort(lambda x, y: cmp(x.name, y.name))
 446
 447         pool = []
 448         offsets = {}
 449         count = 0
 450         for ent in sorted_entries:
 451             offsets[ent] = count
 452             pool.append('%s' % (ent.name))
 453             count += len(ent.name) + 1
 454
 455         pool_str =  self.indent + '"' + \
 456                 ('\\0"\n' + self.indent + '"').join(pool) + '";'
 457         return (pool_str, offsets)
 458
 459     def c_stub_initializer(self, prefix, pool_offsets):
 460         """Return the initializer for struct mapi_stub array."""
 461         stubs = []
 462         for ent in self.entries_sorted_by_names:
 463             stubs.append('%s{ (void *) %d, %d, NULL }' % (
 464                 self.indent, pool_offsets[ent], ent.slot))
 465
 466         return ',\n'.join(stubs)
 467
 468     def c_noop_functions(self, prefix, warn_prefix):
 469         """Return the noop functions."""
 470         noops = []
 471         for ent in self.entries:
 472             if ent.alias:
 473                 continue
 474
 475             proto = self._c_decl(ent, prefix, False, 'static')
 476
 477             stmt1 = self.indent;
 478             space = ''
 479             for t, n, a in ent.params:
 480                 stmt1 += "%s(void) %s;" % (space, n)
 481                 space = ' '
 482
 483             if ent.params:
 484                 stmt1 += '\n';
 485
 486             stmt1 += self.indent + '%s(%s);' % (self.noop_warn,
 487                     self._c_function(ent, warn_prefix, False, True))
 488
 489             if ent.ret:
 490                 stmt2 = self.indent + 'return (%s) 0;' % (ent.ret)
 491                 noop = '%s\n{\n%s\n%s\n}' % (proto, stmt1, stmt2)
 492             else:
 493                 noop = '%s\n{\n%s\n}' % (proto, stmt1)
 494
 495             noops.append(noop)
 496
 497         return '\n\n'.join(noops)
 498
 499     def c_noop_initializer(self, prefix, use_generic):
 500         """Return an initializer for the noop dispatch table."""
 501         entries = [self._c_function(ent, prefix)
 502                 for ent in self.entries if not ent.alias]
 503         if use_generic:
 504             entries = [self.noop_generic] * len(entries)
 505
 506         entries.extend([self.noop_generic] * ABI_NUM_DYNAMIC_ENTRIES)
 507
 508         pre = self.indent + '(mapi_func) '
 509         return pre + (',\n' + pre).join(entries)
 510
 511     def c_asm_gcc(self, prefix, no_hidden):
 512         asm = []
 513
 514         for ent in self.entries:
 515             if ent.hidden and no_hidden:
 516                 continue
 517
 518             if not self.need_entry_point(ent):
 519                 continue
 520
 521             name = self._c_function(ent, prefix, True, True)
 522
 523             if ent.handcode:
 524                 asm.append('#if 0')
 525
 526             if ent.hidden:
 527                 asm.append('".hidden "%s"\\n"' % (name))
 528
 529             if ent.alias and not (ent.alias.hidden and no_hidden):
 530                 asm.append('".globl "%s"\\n"' % (name))
 531                 asm.append('".set "%s", "%s"\\n"' % (name,
 532                     self._c_function(ent.alias, prefix, True, True)))
 533             else:
 534                 asm.append('STUB_ASM_ENTRY(%s)"\\n"' % (name))
 535                 asm.append('"\\t"STUB_ASM_CODE("%d")"\\n"' % (ent.slot))
 536
 537             if ent.handcode:
 538                 asm.append('#endif')
 539             asm.append('')
 540
 541         return "\n".join(asm)
 542
 543     def output_for_lib(self):
 544         print self.c_notice()
 545
 546         if self.c_header:
 547             print
 548             print self.c_header
 549
 550         print
 551         print '#ifdef MAPI_TMP_DEFINES'
 552         print self.c_public_includes()
 553         print
 554         print self.c_public_declarations(self.prefix_lib)
 555         print '#undef MAPI_TMP_DEFINES'
 556         print '#endif /* MAPI_TMP_DEFINES */'
 557
 558         if self.lib_need_table_size:
 559             print
 560             print '#ifdef MAPI_TMP_TABLE'
 561             print self.c_mapi_table()
 562             print '#undef MAPI_TMP_TABLE'
 563             print '#endif /* MAPI_TMP_TABLE */'
 564
 565         if self.lib_need_noop_array:
 566             print
 567             print '#ifdef MAPI_TMP_NOOP_ARRAY'
 568             print '#ifdef DEBUG'
 569             print
 570             print self.c_noop_functions(self.prefix_noop, self.prefix_warn)
 571             print
 572             print 'const mapi_func table_%s_array[] = {' % (self.prefix_noop)
 573             print self.c_noop_initializer(self.prefix_noop, False)
 574             print '};'
 575             print
 576             print '#else /* DEBUG */'
 577             print
 578             print 'const mapi_func table_%s_array[] = {' % (self.prefix_noop)
 579             print self.c_noop_initializer(self.prefix_noop, True)
 580             print '};'
 581             print
 582             print '#endif /* DEBUG */'
 583             print '#undef MAPI_TMP_NOOP_ARRAY'
 584             print '#endif /* MAPI_TMP_NOOP_ARRAY */'
 585
 586         if self.lib_need_stubs:
 587             pool, pool_offsets = self.c_stub_string_pool()
 588             print
 589             print '#ifdef MAPI_TMP_PUBLIC_STUBS'
 590             print 'static const char public_string_pool[] ='
 591             print pool
 592             print
 593             print 'static const struct mapi_stub public_stubs[] = {'
 594             print self.c_stub_initializer(self.prefix_lib, pool_offsets)
 595             print '};'
 596             print '#undef MAPI_TMP_PUBLIC_STUBS'
 597             print '#endif /* MAPI_TMP_PUBLIC_STUBS */'
 598
 599         if self.lib_need_all_entries:
 600             print
 601             print '#ifdef MAPI_TMP_PUBLIC_ENTRIES'
 602             print self.c_public_dispatches(self.prefix_lib, False)
 603             print
 604             print 'static const mapi_func public_entries[] = {'
 605             print self.c_public_initializer(self.prefix_lib)
 606             print '};'
 607             print '#undef MAPI_TMP_PUBLIC_ENTRIES'
 608             print '#endif /* MAPI_TMP_PUBLIC_ENTRIES */'
 609
 610             print
 611             print '#ifdef MAPI_TMP_STUB_ASM_GCC'
 612             print '__asm__('
 613             print self.c_asm_gcc(self.prefix_lib, False)
 614             print ');'
 615             print '#undef MAPI_TMP_STUB_ASM_GCC'
 616             print '#endif /* MAPI_TMP_STUB_ASM_GCC */'
 617
 618         if self.lib_need_non_hidden_entries:
 619             all_hidden = True
 620             for ent in self.entries:
 621                 if not ent.hidden:
 622                     all_hidden = False
 623                     break
 624             if not all_hidden:
 625                 print
 626                 print '#ifdef MAPI_TMP_PUBLIC_ENTRIES_NO_HIDDEN'
 627                 print self.c_public_dispatches(self.prefix_lib, True)
 628                 print
 629                 print '/* does not need public_entries */'
 630                 print '#undef MAPI_TMP_PUBLIC_ENTRIES_NO_HIDDEN'
 631                 print '#endif /* MAPI_TMP_PUBLIC_ENTRIES_NO_HIDDEN */'
 632
 633                 print
 634                 print '#ifdef MAPI_TMP_STUB_ASM_GCC_NO_HIDDEN'
 635                 print '__asm__('
 636                 print self.c_asm_gcc(self.prefix_lib, True)
 637                 print ');'
 638                 print '#undef MAPI_TMP_STUB_ASM_GCC_NO_HIDDEN'
 639                 print '#endif /* MAPI_TMP_STUB_ASM_GCC_NO_HIDDEN */'
 640
 641 class GLAPIPrinter(ABIPrinter):
 642     """OpenGL API Printer"""
 643
 644     def __init__(self, entries):
 645         for ent in entries:
 646             self._override_for_api(ent)
 647         super(GLAPIPrinter, self).__init__(entries)
 648
 649         self.api_defines = ['GL_GLEXT_PROTOTYPES']
 650         self.api_headers = ['"GL/gl.h"', '"GL/glext.h"']
 651         self.api_call = 'GLAPI'
 652         self.api_entry = 'APIENTRY'
 653         self.api_attrs = ''
 654
 655         self.lib_need_table_size = False
 656         self.lib_need_noop_array = False
 657         self.lib_need_stubs = False
 658         self.lib_need_all_entries = False
 659         self.lib_need_non_hidden_entries = True
 660
 661         self.prefix_lib = 'GLAPI_PREFIX'
 662         self.prefix_noop = 'noop'
 663         self.prefix_warn = self.prefix_lib
 664
 665         self.c_header = self._get_c_header()
 666
 667     def _override_for_api(self, ent):
 668         """Override attributes of an entry if necessary for this
 669         printer."""
 670         # By default, no override is necessary.
 671         pass
 672
 673     def _get_c_header(self):
 674         header = """#ifndef _GLAPI_TMP_H_
 675 #define _GLAPI_TMP_H_
 676 #ifdef USE_MGL_NAMESPACE
 677 #define GLAPI_PREFIX(func)  mgl##func
 678 #define GLAPI_PREFIX_STR(func)  "mgl"#func
 679 #else
 680 #define GLAPI_PREFIX(func)  gl##func
 681 #define GLAPI_PREFIX_STR(func)  "gl"#func
 682 #endif /* USE_MGL_NAMESPACE */
 683
 684 typedef int GLclampx;
 685 #endif /* _GLAPI_TMP_H_ */"""
 686
 687         return header
 688
 689 class ES1APIPrinter(GLAPIPrinter):
 690     """OpenGL ES 1.x API Printer"""
 691
 692     def __init__(self, entries):
 693         super(ES1APIPrinter, self).__init__(entries)
 694         self.prefix_lib = 'gl'
 695         self.prefix_warn = 'gl'
 696
 697     def _override_for_api(self, ent):
 698         if ent.xml_data is None:
 699             raise Exception('ES2 API printer requires XML input')
 700         ent.hidden = (ent.name not in \
 701             ent.xml_data.entry_points_for_api_version('es1')) \
 702             or ent.hidden
 703         ent.handcode = False
 704
 705     def _get_c_header(self):
 706         header = """#ifndef _GLAPI_TMP_H_
 707 #define _GLAPI_TMP_H_
 708 typedef int GLclampx;
 709 #endif /* _GLAPI_TMP_H_ */"""
 710
 711         return header
 712
 713 class ES2APIPrinter(GLAPIPrinter):
 714     """OpenGL ES 2.x API Printer"""
 715
 716     def __init__(self, entries):
 717         super(ES2APIPrinter, self).__init__(entries)
 718         self.prefix_lib = 'gl'
 719         self.prefix_warn = 'gl'
 720
 721     def _override_for_api(self, ent):
 722         if ent.xml_data is None:
 723             raise Exception('ES2 API printer requires XML input')
 724         ent.hidden = (ent.name not in \
 725             ent.xml_data.entry_points_for_api_version('es2')) \
 726             or ent.hidden
 727
 728         # This is hella ugly.  The same-named function in desktop OpenGL is
 729         # hidden, but it needs to be exposed by libGLESv2 for OpenGL ES 3.0.
 730         # There's no way to express in the XML that a function should be be
 731         # hidden in one API but exposed in another.
 732         if ent.name == 'GetInternalformativ':
 733             ent.hidden = False
 734
 735         ent.handcode = False
 736
 737     def _get_c_header(self):
 738         header = """#ifndef _GLAPI_TMP_H_
 739 #define _GLAPI_TMP_H_
 740 typedef int GLclampx;
 741 #endif /* _GLAPI_TMP_H_ */"""
 742
 743         return header
 744
 745 class SharedGLAPIPrinter(GLAPIPrinter):
 746     """Shared GLAPI API Printer"""
 747
 748     def __init__(self, entries):
 749         super(SharedGLAPIPrinter, self).__init__(entries)
 750
 751         self.lib_need_table_size = True
 752         self.lib_need_noop_array = True
 753         self.lib_need_stubs = True
 754         self.lib_need_all_entries = True
 755         self.lib_need_non_hidden_entries = False
 756
 757         self.prefix_lib = 'shared'
 758         self.prefix_warn = 'gl'
 759
 760     def _override_for_api(self, ent):
 761         ent.hidden = True
 762         ent.handcode = False
 763
 764     def _get_c_header(self):
 765         header = """#ifndef _GLAPI_TMP_H_
 766 #define _GLAPI_TMP_H_
 767 typedef int GLclampx;
 768 #endif /* _GLAPI_TMP_H_ */"""
 769
 770         return header
 771
 772 def parse_args():
 773     printers = ['glapi', 'es1api', 'es2api', 'shared-glapi']
 774     modes = ['lib', 'app']
 775
 776     parser = OptionParser(usage='usage: %prog [options] <filename>')
 777     parser.add_option('-p', '--printer', dest='printer',
 778             help='printer to use: %s' % (", ".join(printers)))
 779     parser.add_option('-m', '--mode', dest='mode',
 780             help='target user: %s' % (", ".join(modes)))
 781
 782     options, args = parser.parse_args()
 783     if not args or options.printer not in printers or \
 784             options.mode not in modes:
 785         parser.print_help()
 786         sys.exit(1)
 787
 788     return (args[0], options)
 789
 790 def main():
 791     printers = {
 792         'glapi': GLAPIPrinter,
 793         'es1api': ES1APIPrinter,
 794         'es2api': ES2APIPrinter,
 795         'shared-glapi': SharedGLAPIPrinter,
 796     }
 797
 798     filename, options = parse_args()
 799
 800     if filename.endswith('.xml'):
 801         entries = abi_parse_xml(filename)
 802     else:
 803         entries = abi_parse(filename)
 804     abi_sanity_check(entries)
 805
 806     printer = printers[options.printer](entries)
 807     if options.mode == 'lib':
 808         printer.output_for_lib()
 809
 810 if __name__ == '__main__':
 811     main()