aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/glsl/glsl_parser_extras.cpp
blob: 8669b77629b6dfc3e66a73b78414899dd8e2f527 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
/*
 * Copyright © 2008, 2009 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>

extern "C" {
#include "main/core.h" /* for struct gl_context */
#include "main/context.h"
#include "main/shaderobj.h"
}

#include "ralloc.h"
#include "ast.h"
#include "glsl_parser_extras.h"
#include "glsl_parser.h"
#include "ir_optimization.h"
#include "loop_analysis.h"

/**
 * Format a short human-readable description of the given GLSL version.
 */
const char *
glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
{
   return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
                          version / 100, version % 100);
}


static unsigned known_desktop_glsl_versions[] =
   { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430 };


_mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
					       GLenum target, void *mem_ctx)
 : ctx(_ctx)
{
   switch (target) {
   case GL_VERTEX_SHADER:   this->target = vertex_shader; break;
   case GL_FRAGMENT_SHADER: this->target = fragment_shader; break;
   case GL_GEOMETRY_SHADER: this->target = geometry_shader; break;
   }

   this->scanner = NULL;
   this->translation_unit.make_empty();
   this->symbols = new(mem_ctx) glsl_symbol_table;
   this->info_log = ralloc_strdup(mem_ctx, "");
   this->error = false;
   this->loop_nesting_ast = NULL;
   this->switch_state.switch_nesting_ast = NULL;

   this->struct_specifier_depth = 0;
   this->num_builtins_to_link = 0;

   /* Set default language version and extensions */
   this->language_version = ctx->Const.ForceGLSLVersion ?
                            ctx->Const.ForceGLSLVersion : 110;
   this->es_shader = false;
   this->ARB_texture_rectangle_enable = true;

   /* OpenGL ES 2.0 has different defaults from desktop GL. */
   if (ctx->API == API_OPENGLES2) {
      this->language_version = 100;
      this->es_shader = true;
      this->ARB_texture_rectangle_enable = false;
   }

   this->extensions = &ctx->Extensions;

   this->Const.MaxLights = ctx->Const.MaxLights;
   this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
   this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
   this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
   this->Const.MaxVertexAttribs = ctx->Const.VertexProgram.MaxAttribs;
   this->Const.MaxVertexUniformComponents = ctx->Const.VertexProgram.MaxUniformComponents;
   this->Const.MaxVaryingFloats = ctx->Const.MaxVarying * 4;
   this->Const.MaxVertexTextureImageUnits = ctx->Const.VertexProgram.MaxTextureImageUnits;
   this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
   this->Const.MaxTextureImageUnits = ctx->Const.FragmentProgram.MaxTextureImageUnits;
   this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
   this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
   this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;

   this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;

   /* Populate the list of supported GLSL versions */
   /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
    * the OpenGL 3.2 Core context is supported, this logic will need
    * change.  Older versions of GLSL are no longer supported
    * outside the compatibility contexts of 3.x.
    */
   this->num_supported_versions = 0;
   if (_mesa_is_desktop_gl(ctx)) {
      for (unsigned i = 0; i < ARRAY_SIZE(known_desktop_glsl_versions); i++) {
         if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
            this->supported_versions[this->num_supported_versions].ver
               = known_desktop_glsl_versions[i];
            this->supported_versions[this->num_supported_versions].es = false;
            this->num_supported_versions++;
         }
      }
   }
   if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
      this->supported_versions[this->num_supported_versions].ver = 100;
      this->supported_versions[this->num_supported_versions].es = true;
      this->num_supported_versions++;
   }
   if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
      this->supported_versions[this->num_supported_versions].ver = 300;
      this->supported_versions[this->num_supported_versions].es = true;
      this->num_supported_versions++;
   }
   assert(this->num_supported_versions
          <= ARRAY_SIZE(this->supported_versions));

   /* Create a string for use in error messages to tell the user which GLSL
    * versions are supported.
    */
   char *supported = ralloc_strdup(this, "");
   for (unsigned i = 0; i < this->num_supported_versions; i++) {
      unsigned ver = this->supported_versions[i].ver;
      const char *const prefix = (i == 0)
	 ? ""
	 : ((i == this->num_supported_versions - 1) ? ", and " : ", ");
      const char *const suffix = (this->supported_versions[i].es) ? " ES" : "";

      ralloc_asprintf_append(& supported, "%s%u.%02u%s",
			     prefix,
			     ver / 100, ver % 100,
			     suffix);
   }

   this->supported_version_string = supported;

   if (ctx->Const.ForceGLSLExtensionsWarn)
      _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);

   this->default_uniform_qualifier = new(this) ast_type_qualifier();
   this->default_uniform_qualifier->flags.q.shared = 1;
   this->default_uniform_qualifier->flags.q.column_major = 1;

   this->gs_input_prim_type_specified = false;
   this->gs_input_prim_type = GL_POINTS;
   this->out_qualifier = new(this) ast_type_qualifier();
}

/**
 * Determine whether the current GLSL version is sufficiently high to support
 * a certain feature, and generate an error message if it isn't.
 *
 * \param required_glsl_version and \c required_glsl_es_version are
 * interpreted as they are in _mesa_glsl_parse_state::is_version().
 *
 * \param locp is the parser location where the error should be reported.
 *
 * \param fmt (and additional arguments) constitute a printf-style error
 * message to report if the version check fails.  Information about the
 * current and required GLSL versions will be appended.  So, for example, if
 * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
 * "foo unsupported") is called, the error message will be "foo unsupported in
 * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
 */
bool
_mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
                                      unsigned required_glsl_es_version,
                                      YYLTYPE *locp, const char *fmt, ...)
{
   if (this->is_version(required_glsl_version, required_glsl_es_version))
      return true;

   va_list args;
   va_start(args, fmt);
   char *problem = ralloc_vasprintf(this, fmt, args);
   va_end(args);
   const char *glsl_version_string
      = glsl_compute_version_string(this, false, required_glsl_version);
   const char *glsl_es_version_string
      = glsl_compute_version_string(this, true, required_glsl_es_version);
   const char *requirement_string = "";
   if (required_glsl_version && required_glsl_es_version) {
      requirement_string = ralloc_asprintf(this, " (%s or %s required)",
                                           glsl_version_string,
                                           glsl_es_version_string);
   } else if (required_glsl_version) {
      requirement_string = ralloc_asprintf(this, " (%s required)",
                                           glsl_version_string);
   } else if (required_glsl_es_version) {
      requirement_string = ralloc_asprintf(this, " (%s required)",
                                           glsl_es_version_string);
   }
   _mesa_glsl_error(locp, this, "%s in %s%s",
                    problem, this->get_version_string(),
                    requirement_string);

   return false;
}

/**
 * Process a GLSL #version directive.
 *
 * \param version is the integer that follows the #version token.
 *
 * \param ident is a string identifier that follows the integer, if any is
 * present.  Otherwise NULL.
 */
void
_mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
                                                  const char *ident)
{
   bool es_token_present = false;
   if (ident) {
      if (strcmp(ident, "es") == 0) {
         es_token_present = true;
      } else if (version >= 150) {
         if (strcmp(ident, "core") == 0) {
            /* Accept the token.  There's no need to record that this is
             * a core profile shader since that's the only profile we support.
             */
         } else if (strcmp(ident, "compatibility") == 0) {
            _mesa_glsl_error(locp, this,
                             "the compatibility profile is not supported");
         } else {
            _mesa_glsl_error(locp, this,
                             "\"%s\" is not a valid shading language profile; "
                             "if present, it must be \"core\"", ident);
         }
      } else {
         _mesa_glsl_error(locp, this,
                          "illegal text following version number");
      }
   }

   this->es_shader = es_token_present;
   if (version == 100) {
      if (es_token_present) {
         _mesa_glsl_error(locp, this,
                          "GLSL 1.00 ES should be selected using "
                          "`#version 100'");
      } else {
         this->es_shader = true;
      }
   }

   this->language_version = version;

   bool supported = false;
   for (unsigned i = 0; i < this->num_supported_versions; i++) {
      if (this->supported_versions[i].ver == (unsigned) version
          && this->supported_versions[i].es == this->es_shader) {
         supported = true;
         break;
      }
   }

   if (!supported) {
      _mesa_glsl_error(locp, this, "%s is not supported. "
                       "Supported versions are: %s",
                       this->get_version_string(),
                       this->supported_version_string);

      /* On exit, the language_version must be set to a valid value.
       * Later calls to _mesa_glsl_initialize_types will misbehave if
       * the version is invalid.
       */
      switch (this->ctx->API) {
      case API_OPENGL_COMPAT:
      case API_OPENGL_CORE:
	 this->language_version = this->ctx->Const.GLSLVersion;
	 break;

      case API_OPENGLES:
	 assert(!"Should not get here.");
	 /* FALLTHROUGH */

      case API_OPENGLES2:
	 this->language_version = 100;
	 break;
      }
   }

   if (this->language_version >= 140) {
      this->ARB_uniform_buffer_object_enable = true;
   }

   if (this->language_version == 300 && this->es_shader) {
      this->ARB_explicit_attrib_location_enable = true;
   }
}

extern "C" {

/**
 * The most common use of _mesa_glsl_shader_target_name(), which is
 * shared with C code in Mesa core to translate a GLenum to a short
 * shader stage name in debug printouts.
 *
 * It recognizes the PROGRAM variants of the names so it can be used
 * with a struct gl_program->Target, not just a struct
 * gl_shader->Type.
 */
const char *
_mesa_glsl_shader_target_name(GLenum type)
{
   switch (type) {
   case GL_VERTEX_SHADER:
   case GL_VERTEX_PROGRAM_ARB:
      return "vertex";
   case GL_FRAGMENT_SHADER:
   case GL_FRAGMENT_PROGRAM_ARB:
      return "fragment";
   case GL_GEOMETRY_SHADER:
      return "geometry";
   default:
      assert(!"Should not get here.");
      return "unknown";
   }
}

} /* extern "C" */

/**
 * Overloaded C++ variant usable within the compiler for translating
 * our internal enum into short stage names.
 */
const char *
_mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
{
   switch (target) {
   case vertex_shader:   return "vertex";
   case fragment_shader: return "fragment";
   case geometry_shader: return "geometry";
   }

   assert(!"Should not get here.");
   return "unknown";
}

/* This helper function will append the given message to the shader's
   info log and report it via GL_ARB_debug_output. Per that extension,
   'type' is one of the enum values classifying the message, and
   'id' is the implementation-defined ID of the given message. */
static void
_mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
               GLenum type, const char *fmt, va_list ap)
{
   bool error = (type == MESA_DEBUG_TYPE_ERROR);
   GLuint msg_id = 0;

   assert(state->info_log != NULL);

   /* Get the offset that the new message will be written to. */
   int msg_offset = strlen(state->info_log);

   ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
					    locp->source,
					    locp->first_line,
					    locp->first_column,
					    error ? "error" : "warning");
   ralloc_vasprintf_append(&state->info_log, fmt, ap);

   const char *const msg = &state->info_log[msg_offset];
   struct gl_context *ctx = state->ctx;

   /* Report the error via GL_ARB_debug_output. */
   _mesa_shader_debug(ctx, type, &msg_id, msg, strlen(msg));

   ralloc_strcat(&state->info_log, "\n");
}

void
_mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
		 const char *fmt, ...)
{
   va_list ap;

   state->error = true;

   va_start(ap, fmt);
   _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_ERROR, fmt, ap);
   va_end(ap);
}


void
_mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
		   const char *fmt, ...)
{
   va_list ap;

   va_start(ap, fmt);
   _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_OTHER, fmt, ap);
   va_end(ap);
}


/**
 * Enum representing the possible behaviors that can be specified in
 * an #extension directive.
 */
enum ext_behavior {
   extension_disable,
   extension_enable,
   extension_require,
   extension_warn
};

/**
 * Element type for _mesa_glsl_supported_extensions
 */
struct _mesa_glsl_extension {
   /**
    * Name of the extension when referred to in a GLSL extension
    * statement
    */
   const char *name;

   /** True if this extension is available to desktop GL shaders */
   bool avail_in_GL;

   /** True if this extension is available to GLES shaders */
   bool avail_in_ES;

   /**
    * Flag in the gl_extensions struct indicating whether this
    * extension is supported by the driver, or
    * &gl_extensions::dummy_true if supported by all drivers.
    *
    * Note: the type (GLboolean gl_extensions::*) is a "pointer to
    * member" type, the type-safe alternative to the "offsetof" macro.
    * In a nutshell:
    *
    * - foo bar::* p declares p to be an "offset" to a field of type
    *   foo that exists within struct bar
    * - &bar::baz computes the "offset" of field baz within struct bar
    * - x.*p accesses the field of x that exists at "offset" p
    * - x->*p is equivalent to (*x).*p
    */
   const GLboolean gl_extensions::* supported_flag;

   /**
    * Flag in the _mesa_glsl_parse_state struct that should be set
    * when this extension is enabled.
    *
    * See note in _mesa_glsl_extension::supported_flag about "pointer
    * to member" types.
    */
   bool _mesa_glsl_parse_state::* enable_flag;

   /**
    * Flag in the _mesa_glsl_parse_state struct that should be set
    * when the shader requests "warn" behavior for this extension.
    *
    * See note in _mesa_glsl_extension::supported_flag about "pointer
    * to member" types.
    */
   bool _mesa_glsl_parse_state::* warn_flag;


   bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
   void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
};

#define EXT(NAME, GL, ES, SUPPORTED_FLAG)                   \
   { "GL_" #NAME, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
         &_mesa_glsl_parse_state::NAME##_enable,            \
         &_mesa_glsl_parse_state::NAME##_warn }

/**
 * Table of extensions that can be enabled/disabled within a shader,
 * and the conditions under which they are supported.
 */
static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
   /*                                  API availability */
   /* name                             GL     ES         supported flag */
   EXT(ARB_conservative_depth,         true,  false,     ARB_conservative_depth),
   EXT(ARB_draw_buffers,               true,  false,     dummy_true),
   EXT(ARB_draw_instanced,             true,  false,     ARB_draw_instanced),
   EXT(ARB_explicit_attrib_location,   true,  false,     ARB_explicit_attrib_location),
   EXT(ARB_fragment_coord_conventions, true,  false,     ARB_fragment_coord_conventions),
   EXT(ARB_texture_rectangle,          true,  false,     dummy_true),
   EXT(EXT_texture_array,              true,  false,     EXT_texture_array),
   EXT(ARB_shader_texture_lod,         true,  false,     ARB_shader_texture_lod),
   EXT(ARB_shader_stencil_export,      true,  false,     ARB_shader_stencil_export),
   EXT(AMD_conservative_depth,         true,  false,     ARB_conservative_depth),
   EXT(AMD_shader_stencil_export,      true,  false,     ARB_shader_stencil_export),
   EXT(OES_texture_3D,                 false, true,      EXT_texture3D),
   EXT(OES_EGL_image_external,         false, true,      OES_EGL_image_external),
   EXT(ARB_shader_bit_encoding,        true,  false,     ARB_shader_bit_encoding),
   EXT(ARB_uniform_buffer_object,      true,  false,     ARB_uniform_buffer_object),
   EXT(OES_standard_derivatives,       false,  true,     OES_standard_derivatives),
   EXT(ARB_texture_cube_map_array,     true,  false,     ARB_texture_cube_map_array),
   EXT(ARB_shading_language_packing,   true,  false,     ARB_shading_language_packing),
   EXT(ARB_shading_language_420pack,   true,  false,     ARB_shading_language_420pack),
   EXT(ARB_texture_multisample,        true,  false,     ARB_texture_multisample),
   EXT(ARB_texture_query_lod,          true,  false,     ARB_texture_query_lod),
   EXT(ARB_gpu_shader5,                true,  false,     ARB_gpu_shader5),
   EXT(AMD_vertex_shader_layer,        true,  false,     AMD_vertex_shader_layer),
};

#undef EXT


/**
 * Determine whether a given extension is compatible with the target,
 * API, and extension information in the current parser state.
 */
bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
                                                 state) const
{
   /* Check that this extension matches whether we are compiling
    * for desktop GL or GLES.
    */
   if (state->es_shader) {
      if (!this->avail_in_ES) return false;
   } else {
      if (!this->avail_in_GL) return false;
   }

   /* Check that this extension is supported by the OpenGL
    * implementation.
    *
    * Note: the ->* operator indexes into state->extensions by the
    * offset this->supported_flag.  See
    * _mesa_glsl_extension::supported_flag for more info.
    */
   return state->extensions->*(this->supported_flag);
}

/**
 * Set the appropriate flags in the parser state to establish the
 * given behavior for this extension.
 */
void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
                                     ext_behavior behavior) const
{
   /* Note: the ->* operator indexes into state by the
    * offsets this->enable_flag and this->warn_flag.  See
    * _mesa_glsl_extension::supported_flag for more info.
    */
   state->*(this->enable_flag) = (behavior != extension_disable);
   state->*(this->warn_flag)   = (behavior == extension_warn);
}

/**
 * Find an extension by name in _mesa_glsl_supported_extensions.  If
 * the name is not found, return NULL.
 */
static const _mesa_glsl_extension *find_extension(const char *name)
{
   for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
      if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
         return &_mesa_glsl_supported_extensions[i];
      }
   }
   return NULL;
}


bool
_mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
			     const char *behavior_string, YYLTYPE *behavior_locp,
			     _mesa_glsl_parse_state *state)
{
   ext_behavior behavior;
   if (strcmp(behavior_string, "warn") == 0) {
      behavior = extension_warn;
   } else if (strcmp(behavior_string, "require") == 0) {
      behavior = extension_require;
   } else if (strcmp(behavior_string, "enable") == 0) {
      behavior = extension_enable;
   } else if (strcmp(behavior_string, "disable") == 0) {
      behavior = extension_disable;
   } else {
      _mesa_glsl_error(behavior_locp, state,
		       "unknown extension behavior `%s'",
		       behavior_string);
      return false;
   }

   if (strcmp(name, "all") == 0) {
      if ((behavior == extension_enable) || (behavior == extension_require)) {
	 _mesa_glsl_error(name_locp, state, "cannot %s all extensions",
			  (behavior == extension_enable)
			  ? "enable" : "require");
	 return false;
      } else {
         for (unsigned i = 0;
              i < Elements(_mesa_glsl_supported_extensions); ++i) {
            const _mesa_glsl_extension *extension
               = &_mesa_glsl_supported_extensions[i];
            if (extension->compatible_with_state(state)) {
               _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
            }
         }
      }
   } else {
      const _mesa_glsl_extension *extension = find_extension(name);
      if (extension && extension->compatible_with_state(state)) {
         extension->set_flags(state, behavior);
      } else {
         static const char *const fmt = "extension `%s' unsupported in %s shader";

         if (behavior == extension_require) {
            _mesa_glsl_error(name_locp, state, fmt,
                             name, _mesa_glsl_shader_target_name(state->target));
            return false;
         } else {
            _mesa_glsl_warning(name_locp, state, fmt,
                               name, _mesa_glsl_shader_target_name(state->target));
         }
      }
   }

   return true;
}


/**
 * Returns the name of the type of a column of a matrix. E.g.,
 *
 *    "mat3"   -> "vec3"
 *    "mat4x2" -> "vec2"
 */
static const char *
_mesa_ast_get_matrix_column_type_name(const char *matrix_type_name)
{
   static const char *vec_name[] = { "vec2", "vec3", "vec4" };

   /* The number of elements in a row of a matrix is specified by the last
    * character of the matrix type name.
    */
   long rows = strtol(matrix_type_name + strlen(matrix_type_name) - 1,
                      NULL, 10);
   return vec_name[rows - 2];
}

/**
 * Recurses through <type> and <expr> if <expr> is an aggregate initializer
 * and sets <expr>'s <constructor_type> field to <type>. Gives later functions
 * (process_array_constructor, et al) sufficient information to do type
 * checking.
 *
 * Operates on assignments involving an aggregate initializer. E.g.,
 *
 * vec4 pos = {1.0, -1.0, 0.0, 1.0};
 *
 * or more ridiculously,
 *
 * struct S {
 *     vec4 v[2];
 * };
 *
 * struct {
 *     S a[2], b;
 *     int c;
 * } aggregate = {
 *     {
 *         {
 *             {
 *                 {1.0, 2.0, 3.0, 4.0}, // a[0].v[0]
 *                 {5.0, 6.0, 7.0, 8.0}  // a[0].v[1]
 *             } // a[0].v
 *         }, // a[0]
 *         {
 *             {
 *                 {1.0, 2.0, 3.0, 4.0}, // a[1].v[0]
 *                 {5.0, 6.0, 7.0, 8.0}  // a[1].v[1]
 *             } // a[1].v
 *         } // a[1]
 *     }, // a
 *     {
 *         {
 *             {1.0, 2.0, 3.0, 4.0}, // b.v[0]
 *             {5.0, 6.0, 7.0, 8.0}  // b.v[1]
 *         } // b.v
 *     }, // b
 *     4 // c
 * };
 *
 * This pass is necessary because the right-hand side of <type> e = { ... }
 * doesn't contain sufficient information to determine if the types match.
 */
void
_mesa_ast_set_aggregate_type(const ast_type_specifier *type,
                             ast_expression *expr,
                             _mesa_glsl_parse_state *state)
{
   void *ctx = state;
   ast_aggregate_initializer *ai = (ast_aggregate_initializer *)expr;
   ai->constructor_type = (ast_type_specifier *)type;

   bool is_declaration = ai->constructor_type->structure != NULL;
   if (!is_declaration) {
      /* Look up <type> name in the symbol table to see if it's a struct. */
      const ast_type_specifier *struct_type =
         state->symbols->get_type_ast(type->type_name);
      ai->constructor_type->structure =
         struct_type ? new(ctx) ast_struct_specifier(*struct_type->structure)
                     : NULL;
   }

   /* If the aggregate is an array, recursively set its elements' types. */
   if (type->is_array) {
      /* We want to set the element type which is not an array itself, so make
       * a copy of the array type and set its is_array field to false.
       *
       * E.g., if <type> if struct S[2] we want to set each element's type to
       * struct S.
       *
       * FINISHME: Update when ARB_array_of_arrays is supported.
       */
      const ast_type_specifier *non_array_type =
         new(ctx) ast_type_specifier(type, false, NULL);

      for (exec_node *expr_node = ai->expressions.head;
           !expr_node->is_tail_sentinel();
           expr_node = expr_node->next) {
         ast_expression *expr = exec_node_data(ast_expression, expr_node,
                                               link);

         if (expr->oper == ast_aggregate)
            _mesa_ast_set_aggregate_type(non_array_type, expr, state);
      }

   /* If the aggregate is a struct, recursively set its fields' types. */
   } else if (ai->constructor_type->structure) {
      ai->constructor_type->structure->is_declaration = is_declaration;
      exec_node *expr_node = ai->expressions.head;

      /* Iterate through the struct's fields' declarations. E.g., iterate from
       * "float a, b" to "int c" in the struct below.
       *
       *     struct {
       *         float a, b;
       *         int c;
       *     } s;
       */
      for (exec_node *decl_list_node =
              ai->constructor_type->structure->declarations.head;
           !decl_list_node->is_tail_sentinel();
           decl_list_node = decl_list_node->next) {
         ast_declarator_list *decl_list = exec_node_data(ast_declarator_list,
                                                         decl_list_node, link);

         for (exec_node *decl_node = decl_list->declarations.head;
              !decl_node->is_tail_sentinel() && !expr_node->is_tail_sentinel();
              decl_node = decl_node->next, expr_node = expr_node->next) {
            ast_declaration *decl = exec_node_data(ast_declaration, decl_node,
                                                   link);
            ast_expression *expr = exec_node_data(ast_expression, expr_node,
                                                  link);

            bool is_array = decl_list->type->specifier->is_array;
            ast_expression *array_size = decl_list->type->specifier->array_size;

            /* Recognize variable declarations with the bracketed size attached
             * to the type rather than the variable name as arrays. E.g.,
             *
             *     float a[2];
             *     float[2] b;
             *
             * are both arrays, but <a>'s array_size is decl->array_size, while
             * <b>'s array_size is decl_list->type->specifier->array_size.
             */
            if (!is_array) {
               /* FINISHME: Update when ARB_array_of_arrays is supported. */
               is_array = decl->is_array;
               array_size = decl->array_size;
            }

            /* Declaration shadows the <type> parameter. */
            ast_type_specifier *type =
               new(ctx) ast_type_specifier(decl_list->type->specifier,
                                           is_array, array_size);

            if (expr->oper == ast_aggregate)
               _mesa_ast_set_aggregate_type(type, expr, state);
         }
      }
   } else {
      /* If the aggregate is a matrix, set its columns' types. */
      const char *name;
      const glsl_type *const constructor_type =
         ai->constructor_type->glsl_type(&name, state);

      if (constructor_type->is_matrix()) {
         for (exec_node *expr_node = ai->expressions.head;
              !expr_node->is_tail_sentinel();
              expr_node = expr_node->next) {
            ast_expression *expr = exec_node_data(ast_expression, expr_node,
                                                  link);

            /* Declaration shadows the <type> parameter. */
            ast_type_specifier *type = new(ctx)
               ast_type_specifier(_mesa_ast_get_matrix_column_type_name(name));

            if (expr->oper == ast_aggregate)
               _mesa_ast_set_aggregate_type(type, expr, state);
         }
      }
   }
}


void
_mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
{
   if (q->flags.q.constant)
      printf("const ");

   if (q->flags.q.invariant)
      printf("invariant ");

   if (q->flags.q.attribute)
      printf("attribute ");

   if (q->flags.q.varying)
      printf("varying ");

   if (q->flags.q.in && q->flags.q.out)
      printf("inout ");
   else {
      if (q->flags.q.in)
	 printf("in ");

      if (q->flags.q.out)
	 printf("out ");
   }

   if (q->flags.q.centroid)
      printf("centroid ");
   if (q->flags.q.uniform)
      printf("uniform ");
   if (q->flags.q.smooth)
      printf("smooth ");
   if (q->flags.q.flat)
      printf("flat ");
   if (q->flags.q.noperspective)
      printf("noperspective ");
}


void
ast_node::print(void) const
{
   printf("unhandled node ");
}


ast_node::ast_node(void)
{
   this->location.source = 0;
   this->location.line = 0;
   this->location.column = 0;
}


static void
ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
{
   if (is_array) {
      printf("[ ");

      if (array_size)
	 array_size->print();

      printf("] ");
   }
}


void
ast_compound_statement::print(void) const
{
   printf("{\n");
   
   foreach_list_const(n, &this->statements) {
      ast_node *ast = exec_node_data(ast_node, n, link);
      ast->print();
   }

   printf("}\n");
}


ast_compound_statement::ast_compound_statement(int new_scope,
					       ast_node *statements)
{
   this->new_scope = new_scope;

   if (statements != NULL) {
      this->statements.push_degenerate_list_at_head(&statements->link);
   }
}


void
ast_expression::print(void) const
{
   switch (oper) {
   case ast_assign:
   case ast_mul_assign:
   case ast_div_assign:
   case ast_mod_assign:
   case ast_add_assign:
   case ast_sub_assign:
   case ast_ls_assign:
   case ast_rs_assign:
   case ast_and_assign:
   case ast_xor_assign:
   case ast_or_assign:
      subexpressions[0]->print();
      printf("%s ", operator_string(oper));
      subexpressions[1]->print();
      break;

   case ast_field_selection:
      subexpressions[0]->print();
      printf(". %s ", primary_expression.identifier);
      break;

   case ast_plus:
   case ast_neg:
   case ast_bit_not:
   case ast_logic_not:
   case ast_pre_inc:
   case ast_pre_dec:
      printf("%s ", operator_string(oper));
      subexpressions[0]->print();
      break;

   case ast_post_inc:
   case ast_post_dec:
      subexpressions[0]->print();
      printf("%s ", operator_string(oper));
      break;

   case ast_conditional:
      subexpressions[0]->print();
      printf("? ");
      subexpressions[1]->print();
      printf(": ");
      subexpressions[2]->print();
      break;

   case ast_array_index:
      subexpressions[0]->print();
      printf("[ ");
      subexpressions[1]->print();
      printf("] ");
      break;

   case ast_function_call: {
      subexpressions[0]->print();
      printf("( ");

      foreach_list_const (n, &this->expressions) {
	 if (n != this->expressions.get_head())
	    printf(", ");

	 ast_node *ast = exec_node_data(ast_node, n, link);
	 ast->print();
      }

      printf(") ");
      break;
   }

   case ast_identifier:
      printf("%s ", primary_expression.identifier);
      break;

   case ast_int_constant:
      printf("%d ", primary_expression.int_constant);
      break;

   case ast_uint_constant:
      printf("%u ", primary_expression.uint_constant);
      break;

   case ast_float_constant:
      printf("%f ", primary_expression.float_constant);
      break;

   case ast_bool_constant:
      printf("%s ",
	     primary_expression.bool_constant
	     ? "true" : "false");
      break;

   case ast_sequence: {
      printf("( ");
      foreach_list_const(n, & this->expressions) {
	 if (n != this->expressions.get_head())
	    printf(", ");

	 ast_node *ast = exec_node_data(ast_node, n, link);
	 ast->print();
      }
      printf(") ");
      break;
   }

   case ast_aggregate: {
      printf("{ ");
      foreach_list_const(n, & this->expressions) {
	 if (n != this->expressions.get_head())
	    printf(", ");

	 ast_node *ast = exec_node_data(ast_node, n, link);
	 ast->print();
      }
      printf("} ");
      break;
   }

   default:
      assert(0);
      break;
   }
}

ast_expression::ast_expression(int oper,
			       ast_expression *ex0,
			       ast_expression *ex1,
			       ast_expression *ex2)
{
   this->oper = ast_operators(oper);
   this->subexpressions[0] = ex0;
   this->subexpressions[1] = ex1;
   this->subexpressions[2] = ex2;
   this->non_lvalue_description = NULL;
}


void
ast_expression_statement::print(void) const
{
   if (expression)
      expression->print();

   printf("; ");
}


ast_expression_statement::ast_expression_statement(ast_expression *ex) :
   expression(ex)
{
   /* empty */
}


void
ast_function::print(void) const
{
   return_type->print();
   printf(" %s (", identifier);

   foreach_list_const(n, & this->parameters) {
      ast_node *ast = exec_node_data(ast_node, n, link);
      ast->print();
   }

   printf(")");
}


ast_function::ast_function(void)
   : return_type(NULL), identifier(NULL), is_definition(false),
     signature(NULL)
{
   /* empty */
}


void
ast_fully_specified_type::print(void) const
{
   _mesa_ast_type_qualifier_print(& qualifier);
   specifier->print();
}


void
ast_parameter_declarator::print(void) const
{
   type->print();
   if (identifier)
      printf("%s ", identifier);
   ast_opt_array_size_print(is_array, array_size);
}


void
ast_function_definition::print(void) const
{
   prototype->print();
   body->print();
}


void
ast_declaration::print(void) const
{
   printf("%s ", identifier);
   ast_opt_array_size_print(is_array, array_size);

   if (initializer) {
      printf("= ");
      initializer->print();
   }
}


ast_declaration::ast_declaration(const char *identifier, bool is_array,
				 ast_expression *array_size,
				 ast_expression *initializer)
{
   this->identifier = identifier;
   this->is_array = is_array;
   this->array_size = array_size;
   this->initializer = initializer;
}


void
ast_declarator_list::print(void) const
{
   assert(type || invariant);

   if (type)
      type->print();
   else
      printf("invariant ");

   foreach_list_const (ptr, & this->declarations) {
      if (ptr != this->declarations.get_head())
	 printf(", ");

      ast_node *ast = exec_node_data(ast_node, ptr, link);
      ast->print();
   }

   printf("; ");
}


ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
{
   this->type = type;
   this->invariant = false;
}

void
ast_jump_statement::print(void) const
{
   switch (mode) {
   case ast_continue:
      printf("continue; ");
      break;
   case ast_break:
      printf("break; ");
      break;
   case ast_return:
      printf("return ");
      if (opt_return_value)
	 opt_return_value->print();

      printf("; ");
      break;
   case ast_discard:
      printf("discard; ");
      break;
   }
}


ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
   : opt_return_value(NULL)
{
   this->mode = ast_jump_modes(mode);

   if (mode == ast_return)
      opt_return_value = return_value;
}


void
ast_selection_statement::print(void) const
{
   printf("if ( ");
   condition->print();
   printf(") ");

   then_statement->print();

   if (else_statement) {
      printf("else ");
      else_statement->print();
   }
   
}


ast_selection_statement::ast_selection_statement(ast_expression *condition,
						 ast_node *then_statement,
						 ast_node *else_statement)
{
   this->condition = condition;
   this->then_statement = then_statement;
   this->else_statement = else_statement;
}


void
ast_switch_statement::print(void) const
{
   printf("switch ( ");
   test_expression->print();
   printf(") ");

   body->print();
}


ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
					   ast_node *body)
{
   this->test_expression = test_expression;
   this->body = body;
}


void
ast_switch_body::print(void) const
{
   printf("{\n");
   if (stmts != NULL) {
      stmts->print();
   }
   printf("}\n");
}


ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
{
   this->stmts = stmts;
}


void ast_case_label::print(void) const
{
   if (test_value != NULL) {
      printf("case ");
      test_value->print();
      printf(": ");
   } else {
      printf("default: ");
   }
}


ast_case_label::ast_case_label(ast_expression *test_value)
{
   this->test_value = test_value;
}


void ast_case_label_list::print(void) const
{
   foreach_list_const(n, & this->labels) {
      ast_node *ast = exec_node_data(ast_node, n, link);
      ast->print();
   }
   printf("\n");
}


ast_case_label_list::ast_case_label_list(void)
{
}


void ast_case_statement::print(void) const
{
   labels->print();
   foreach_list_const(n, & this->stmts) {
      ast_node *ast = exec_node_data(ast_node, n, link);
      ast->print();
      printf("\n");
   }
}


ast_case_statement::ast_case_statement(ast_case_label_list *labels)
{
   this->labels = labels;
}


void ast_case_statement_list::print(void) const
{
   foreach_list_const(n, & this->cases) {
      ast_node *ast = exec_node_data(ast_node, n, link);
      ast->print();
   }
}


ast_case_statement_list::ast_case_statement_list(void)
{
}


void
ast_iteration_statement::print(void) const
{
   switch (mode) {
   case ast_for:
      printf("for( ");
      if (init_statement)
	 init_statement->print();
      printf("; ");

      if (condition)
	 condition->print();
      printf("; ");

      if (rest_expression)
	 rest_expression->print();
      printf(") ");

      body->print();
      break;

   case ast_while:
      printf("while ( ");
      if (condition)
	 condition->print();
      printf(") ");
      body->print();
      break;

   case ast_do_while:
      printf("do ");
      body->print();
      printf("while ( ");
      if (condition)
	 condition->print();
      printf("); ");
      break;
   }
}


ast_iteration_statement::ast_iteration_statement(int mode,
						 ast_node *init,
						 ast_node *condition,
						 ast_expression *rest_expression,
						 ast_node *body)
{
   this->mode = ast_iteration_modes(mode);
   this->init_statement = init;
   this->condition = condition;
   this->rest_expression = rest_expression;
   this->body = body;
}


void
ast_struct_specifier::print(void) const
{
   printf("struct %s { ", name);
   foreach_list_const(n, &this->declarations) {
      ast_node *ast = exec_node_data(ast_node, n, link);
      ast->print();
   }
   printf("} ");
}


ast_struct_specifier::ast_struct_specifier(const char *identifier,
					   ast_declarator_list *declarator_list)
{
   if (identifier == NULL) {
      static unsigned anon_count = 1;
      identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
      anon_count++;
   }
   name = identifier;
   this->declarations.push_degenerate_list_at_head(&declarator_list->link);
   is_declaration = true;
}

static void
set_shader_inout_layout(struct gl_shader *shader,
		     struct _mesa_glsl_parse_state *state)
{
   if (shader->Type != GL_GEOMETRY_SHADER) {
      /* Should have been prevented by the parser. */
      assert(!state->gs_input_prim_type_specified);
      assert(!state->out_qualifier->flags.i);
      return;
   }

   shader->Geom.VerticesOut = 0;
   if (state->out_qualifier->flags.q.max_vertices)
      shader->Geom.VerticesOut = state->out_qualifier->max_vertices;

   if (state->gs_input_prim_type_specified) {
      shader->Geom.InputType = state->gs_input_prim_type;
   } else {
      shader->Geom.InputType = PRIM_UNKNOWN;
   }

   if (state->out_qualifier->flags.q.prim_type) {
      shader->Geom.OutputType = state->out_qualifier->prim_type;
   } else {
      shader->Geom.OutputType = PRIM_UNKNOWN;
   }
}

extern "C" {

void
_mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
                          bool dump_ast, bool dump_hir)
{
   struct _mesa_glsl_parse_state *state =
      new(shader) _mesa_glsl_parse_state(ctx, shader->Type, shader);
   const char *source = shader->Source;

   state->error = glcpp_preprocess(state, &source, &state->info_log,
                             &ctx->Extensions, ctx);

   if (!state->error) {
     _mesa_glsl_lexer_ctor(state, source);
     _mesa_glsl_parse(state);
     _mesa_glsl_lexer_dtor(state);
   }

   if (dump_ast) {
      foreach_list_const(n, &state->translation_unit) {
         ast_node *ast = exec_node_data(ast_node, n, link);
         ast->print();
      }
      printf("\n\n");
   }

   ralloc_free(shader->ir);
   shader->ir = new(shader) exec_list;
   if (!state->error && !state->translation_unit.is_empty())
      _mesa_ast_to_hir(shader->ir, state);

   if (!state->error) {
      validate_ir_tree(shader->ir);

      /* Print out the unoptimized IR. */
      if (dump_hir) {
         _mesa_print_ir(shader->ir, state);
      }
   }


   if (!state->error && !shader->ir->is_empty()) {
      struct gl_shader_compiler_options *options =
         &ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(shader->Type)];

      /* Do some optimization at compile time to reduce shader IR size
       * and reduce later work if the same shader is linked multiple times
       */
      while (do_common_optimization(shader->ir, false, false, 32, options))
         ;

      validate_ir_tree(shader->ir);
   }

   if (shader->InfoLog)
      ralloc_free(shader->InfoLog);

   shader->symbols = state->symbols;
   shader->CompileStatus = !state->error;
   shader->InfoLog = state->info_log;
   shader->Version = state->language_version;
   shader->InfoLog = state->info_log;
   shader->IsES = state->es_shader;

   memcpy(shader->builtins_to_link, state->builtins_to_link,
          sizeof(shader->builtins_to_link[0]) * state->num_builtins_to_link);
   shader->num_builtins_to_link = state->num_builtins_to_link;

   if (shader->UniformBlocks)
      ralloc_free(shader->UniformBlocks);
   shader->NumUniformBlocks = state->num_uniform_blocks;
   shader->UniformBlocks = state->uniform_blocks;
   ralloc_steal(shader, shader->UniformBlocks);

   if (!state->error)
      set_shader_inout_layout(shader, state);

   /* Retain any live IR, but trash the rest. */
   reparent_ir(shader->ir, shader->ir);

   ralloc_free(state);
}

} /* extern "C" */
/**
 * Do the set of common optimizations passes
 *
 * \param ir                          List of instructions to be optimized
 * \param linked                      Is the shader linked?  This enables
 *                                    optimizations passes that remove code at
 *                                    global scope and could cause linking to
 *                                    fail.
 * \param uniform_locations_assigned  Have locations already been assigned for
 *                                    uniforms?  This prevents the declarations
 *                                    of unused uniforms from being removed.
 *                                    The setting of this flag only matters if
 *                                    \c linked is \c true.
 * \param max_unroll_iterations       Maximum number of loop iterations to be
 *                                    unrolled.  Setting to 0 disables loop
 *                                    unrolling.
 * \param options                     The driver's preferred shader options.
 */
bool
do_common_optimization(exec_list *ir, bool linked,
		       bool uniform_locations_assigned,
		       unsigned max_unroll_iterations,
                       const struct gl_shader_compiler_options *options)
{
   GLboolean progress = GL_FALSE;

   progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;

   if (linked) {
      progress = do_function_inlining(ir) || progress;
      progress = do_dead_functions(ir) || progress;
      progress = do_structure_splitting(ir) || progress;
   }
   progress = do_if_simplification(ir) || progress;
   progress = opt_flatten_nested_if_blocks(ir) || progress;
   progress = do_copy_propagation(ir) || progress;
   progress = do_copy_propagation_elements(ir) || progress;

   if (options->PreferDP4 && !linked)
      progress = opt_flip_matrices(ir) || progress;

   if (linked)
      progress = do_dead_code(ir, uniform_locations_assigned) || progress;
   else
      progress = do_dead_code_unlinked(ir) || progress;
   progress = do_dead_code_local(ir) || progress;
   progress = do_tree_grafting(ir) || progress;
   progress = do_constant_propagation(ir) || progress;
   if (linked)
      progress = do_constant_variable(ir) || progress;
   else
      progress = do_constant_variable_unlinked(ir) || progress;
   progress = do_constant_folding(ir) || progress;
   progress = do_algebraic(ir) || progress;
   progress = do_lower_jumps(ir) || progress;
   progress = do_vec_index_to_swizzle(ir) || progress;
   progress = lower_vector_insert(ir, false) || progress;
   progress = do_swizzle_swizzle(ir) || progress;
   progress = do_noop_swizzle(ir) || progress;

   progress = optimize_split_arrays(ir, linked) || progress;
   progress = optimize_redundant_jumps(ir) || progress;

   loop_state *ls = analyze_loop_variables(ir);
   if (ls->loop_found) {
      progress = set_loop_controls(ir, ls) || progress;
      progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
   }
   delete ls;

   return progress;
}

extern "C" {

/**
 * To be called at GL teardown time, this frees compiler datastructures.
 *
 * After calling this, any previously compiled shaders and shader
 * programs would be invalid.  So this should happen at approximately
 * program exit.
 */
void
_mesa_destroy_shader_compiler(void)
{
   _mesa_destroy_shader_compiler_caches();

   _mesa_glsl_release_types();
}

/**
 * Releases compiler caches to trade off performance for memory.
 *
 * Intended to be used with glReleaseShaderCompiler().
 */
void
_mesa_destroy_shader_compiler_caches(void)
{
   _mesa_glsl_release_functions();
}

}