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[mesa.git] / src / glsl / glcpp / glcpp-parse.y
1 %{
2 /*
3 * Copyright © 2010 Intel Corporation
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * 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
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <assert.h>
29 #include <inttypes.h>
30
31 #include "glcpp.h"
32 #include "main/core.h" /* for struct gl_extensions */
33 #include "main/mtypes.h" /* for gl_api enum */
34
35 static void
36 yyerror (YYLTYPE *locp, glcpp_parser_t *parser, const char *error);
37
38 static void
39 _define_object_macro (glcpp_parser_t *parser,
40 YYLTYPE *loc,
41 const char *macro,
42 token_list_t *replacements);
43
44 static void
45 _define_function_macro (glcpp_parser_t *parser,
46 YYLTYPE *loc,
47 const char *macro,
48 string_list_t *parameters,
49 token_list_t *replacements);
50
51 static string_list_t *
52 _string_list_create (void *ctx);
53
54 static void
55 _string_list_append_item (string_list_t *list, const char *str);
56
57 static int
58 _string_list_contains (string_list_t *list, const char *member, int *index);
59
60 static int
61 _string_list_length (string_list_t *list);
62
63 static int
64 _string_list_equal (string_list_t *a, string_list_t *b);
65
66 static argument_list_t *
67 _argument_list_create (void *ctx);
68
69 static void
70 _argument_list_append (argument_list_t *list, token_list_t *argument);
71
72 static int
73 _argument_list_length (argument_list_t *list);
74
75 static token_list_t *
76 _argument_list_member_at (argument_list_t *list, int index);
77
78 /* Note: This function ralloc_steal()s the str pointer. */
79 static token_t *
80 _token_create_str (void *ctx, int type, char *str);
81
82 static token_t *
83 _token_create_ival (void *ctx, int type, int ival);
84
85 static token_list_t *
86 _token_list_create (void *ctx);
87
88 /* Note: This function calls ralloc_steal on token. */
89 static void
90 _token_list_append (token_list_t *list, token_t *token);
91
92 static void
93 _token_list_append_list (token_list_t *list, token_list_t *tail);
94
95 static int
96 _token_list_equal_ignoring_space (token_list_t *a, token_list_t *b);
97
98 static void
99 _parser_active_list_push (glcpp_parser_t *parser,
100 const char *identifier,
101 token_node_t *marker);
102
103 static void
104 _parser_active_list_pop (glcpp_parser_t *parser);
105
106 static int
107 _parser_active_list_contains (glcpp_parser_t *parser, const char *identifier);
108
109 static void
110 _glcpp_parser_expand_if (glcpp_parser_t *parser, int type, token_list_t *list);
111
112 static void
113 _glcpp_parser_expand_token_list (glcpp_parser_t *parser,
114 token_list_t *list);
115
116 static void
117 _glcpp_parser_print_expanded_token_list (glcpp_parser_t *parser,
118 token_list_t *list);
119
120 static void
121 _glcpp_parser_skip_stack_push_if (glcpp_parser_t *parser, YYLTYPE *loc,
122 int condition);
123
124 static void
125 _glcpp_parser_skip_stack_change_if (glcpp_parser_t *parser, YYLTYPE *loc,
126 const char *type, int condition);
127
128 static void
129 _glcpp_parser_skip_stack_pop (glcpp_parser_t *parser, YYLTYPE *loc);
130
131 #define yylex glcpp_parser_lex
132
133 static int
134 glcpp_parser_lex (YYSTYPE *yylval, YYLTYPE *yylloc, glcpp_parser_t *parser);
135
136 static void
137 glcpp_parser_lex_from (glcpp_parser_t *parser, token_list_t *list);
138
139 static void
140 add_builtin_define(glcpp_parser_t *parser, const char *name, int value);
141
142 %}
143
144 %pure-parser
145 %error-verbose
146
147 %locations
148 %initial-action {
149 @$.first_line = 1;
150 @$.first_column = 1;
151 @$.last_line = 1;
152 @$.last_column = 1;
153 @$.source = 0;
154 }
155
156 %parse-param {glcpp_parser_t *parser}
157 %lex-param {glcpp_parser_t *parser}
158
159 %expect 0
160 %token COMMA_FINAL DEFINED ELIF_EXPANDED HASH HASH_DEFINE_FUNC HASH_DEFINE_OBJ HASH_ELIF HASH_ELSE HASH_ENDIF HASH_IF HASH_IFDEF HASH_IFNDEF HASH_UNDEF HASH_VERSION IDENTIFIER IF_EXPANDED INTEGER INTEGER_STRING NEWLINE OTHER PLACEHOLDER SPACE
161 %token PASTE
162 %type <ival> expression INTEGER operator SPACE integer_constant
163 %type <str> IDENTIFIER INTEGER_STRING OTHER
164 %type <string_list> identifier_list
165 %type <token> preprocessing_token conditional_token
166 %type <token_list> pp_tokens replacement_list text_line conditional_tokens
167 %left OR
168 %left AND
169 %left '|'
170 %left '^'
171 %left '&'
172 %left EQUAL NOT_EQUAL
173 %left '<' '>' LESS_OR_EQUAL GREATER_OR_EQUAL
174 %left LEFT_SHIFT RIGHT_SHIFT
175 %left '+' '-'
176 %left '*' '/' '%'
177 %right UNARY
178
179 %%
180
181 input:
182 /* empty */
183 | input line
184 ;
185
186 line:
187 control_line {
188 ralloc_strcat (&parser->output, "\n");
189 }
190 | text_line {
191 _glcpp_parser_print_expanded_token_list (parser, $1);
192 ralloc_strcat (&parser->output, "\n");
193 ralloc_free ($1);
194 }
195 | expanded_line
196 | HASH non_directive
197 ;
198
199 expanded_line:
200 IF_EXPANDED expression NEWLINE {
201 _glcpp_parser_skip_stack_push_if (parser, & @1, $2);
202 }
203 | ELIF_EXPANDED expression NEWLINE {
204 _glcpp_parser_skip_stack_change_if (parser, & @1, "elif", $2);
205 }
206 ;
207
208 control_line:
209 HASH_DEFINE_OBJ IDENTIFIER replacement_list NEWLINE {
210 _define_object_macro (parser, & @2, $2, $3);
211 }
212 | HASH_DEFINE_FUNC IDENTIFIER '(' ')' replacement_list NEWLINE {
213 _define_function_macro (parser, & @2, $2, NULL, $5);
214 }
215 | HASH_DEFINE_FUNC IDENTIFIER '(' identifier_list ')' replacement_list NEWLINE {
216 _define_function_macro (parser, & @2, $2, $4, $6);
217 }
218 | HASH_UNDEF IDENTIFIER NEWLINE {
219 macro_t *macro = hash_table_find (parser->defines, $2);
220 if (macro) {
221 hash_table_remove (parser->defines, $2);
222 ralloc_free (macro);
223 }
224 ralloc_free ($2);
225 }
226 | HASH_IF conditional_tokens NEWLINE {
227 /* Be careful to only evaluate the 'if' expression if
228 * we are not skipping. When we are skipping, we
229 * simply push a new 0-valued 'if' onto the skip
230 * stack.
231 *
232 * This avoids generating diagnostics for invalid
233 * expressions that are being skipped. */
234 if (parser->skip_stack == NULL ||
235 parser->skip_stack->type == SKIP_NO_SKIP)
236 {
237 _glcpp_parser_expand_if (parser, IF_EXPANDED, $2);
238 }
239 else
240 {
241 _glcpp_parser_skip_stack_push_if (parser, & @1, 0);
242 parser->skip_stack->type = SKIP_TO_ENDIF;
243 }
244 }
245 | HASH_IF NEWLINE {
246 /* #if without an expression is only an error if we
247 * are not skipping */
248 if (parser->skip_stack == NULL ||
249 parser->skip_stack->type == SKIP_NO_SKIP)
250 {
251 glcpp_error(& @1, parser, "#if with no expression");
252 }
253 _glcpp_parser_skip_stack_push_if (parser, & @1, 0);
254 }
255 | HASH_IFDEF IDENTIFIER junk NEWLINE {
256 macro_t *macro = hash_table_find (parser->defines, $2);
257 ralloc_free ($2);
258 _glcpp_parser_skip_stack_push_if (parser, & @1, macro != NULL);
259 }
260 | HASH_IFNDEF IDENTIFIER junk NEWLINE {
261 macro_t *macro = hash_table_find (parser->defines, $2);
262 ralloc_free ($2);
263 _glcpp_parser_skip_stack_push_if (parser, & @1, macro == NULL);
264 }
265 | HASH_ELIF conditional_tokens NEWLINE {
266 /* Be careful to only evaluate the 'elif' expression
267 * if we are not skipping. When we are skipping, we
268 * simply change to a 0-valued 'elif' on the skip
269 * stack.
270 *
271 * This avoids generating diagnostics for invalid
272 * expressions that are being skipped. */
273 if (parser->skip_stack &&
274 parser->skip_stack->type == SKIP_TO_ELSE)
275 {
276 _glcpp_parser_expand_if (parser, ELIF_EXPANDED, $2);
277 }
278 else
279 {
280 _glcpp_parser_skip_stack_change_if (parser, & @1,
281 "elif", 0);
282 }
283 }
284 | HASH_ELIF NEWLINE {
285 /* #elif without an expression is an error unless we
286 * are skipping. */
287 if (parser->skip_stack &&
288 parser->skip_stack->type == SKIP_TO_ELSE)
289 {
290 glcpp_error(& @1, parser, "#elif with no expression");
291 }
292 else
293 {
294 _glcpp_parser_skip_stack_change_if (parser, & @1,
295 "elif", 0);
296 glcpp_warning(& @1, parser, "ignoring illegal #elif without expression");
297 }
298 }
299 | HASH_ELSE NEWLINE {
300 _glcpp_parser_skip_stack_change_if (parser, & @1, "else", 1);
301 }
302 | HASH_ENDIF NEWLINE {
303 _glcpp_parser_skip_stack_pop (parser, & @1);
304 }
305 | HASH_VERSION integer_constant NEWLINE {
306 macro_t *macro = hash_table_find (parser->defines, "__VERSION__");
307 if (macro) {
308 hash_table_remove (parser->defines, "__VERSION__");
309 ralloc_free (macro);
310 }
311 add_builtin_define (parser, "__VERSION__", $2);
312
313 if ($2 == 100)
314 add_builtin_define (parser, "GL_ES", 1);
315
316 /* Currently, all ES2 implementations support highp in the
317 * fragment shader, so we always define this macro in ES2.
318 * If we ever get a driver that doesn't support highp, we'll
319 * need to add a flag to the gl_context and check that here.
320 */
321 if ($2 >= 130 || $2 == 100)
322 add_builtin_define (parser, "GL_FRAGMENT_PRECISION_HIGH", 1);
323
324 ralloc_asprintf_append (&parser->output, "#version %" PRIiMAX, $2);
325 }
326 | HASH NEWLINE
327 ;
328
329 integer_constant:
330 INTEGER_STRING {
331 if (strlen ($1) >= 3 && strncmp ($1, "0x", 2) == 0) {
332 $$ = strtoll ($1 + 2, NULL, 16);
333 } else if ($1[0] == '0') {
334 $$ = strtoll ($1, NULL, 8);
335 } else {
336 $$ = strtoll ($1, NULL, 10);
337 }
338 }
339 | INTEGER {
340 $$ = $1;
341 }
342
343 expression:
344 integer_constant
345 | expression OR expression {
346 $$ = $1 || $3;
347 }
348 | expression AND expression {
349 $$ = $1 && $3;
350 }
351 | expression '|' expression {
352 $$ = $1 | $3;
353 }
354 | expression '^' expression {
355 $$ = $1 ^ $3;
356 }
357 | expression '&' expression {
358 $$ = $1 & $3;
359 }
360 | expression NOT_EQUAL expression {
361 $$ = $1 != $3;
362 }
363 | expression EQUAL expression {
364 $$ = $1 == $3;
365 }
366 | expression GREATER_OR_EQUAL expression {
367 $$ = $1 >= $3;
368 }
369 | expression LESS_OR_EQUAL expression {
370 $$ = $1 <= $3;
371 }
372 | expression '>' expression {
373 $$ = $1 > $3;
374 }
375 | expression '<' expression {
376 $$ = $1 < $3;
377 }
378 | expression RIGHT_SHIFT expression {
379 $$ = $1 >> $3;
380 }
381 | expression LEFT_SHIFT expression {
382 $$ = $1 << $3;
383 }
384 | expression '-' expression {
385 $$ = $1 - $3;
386 }
387 | expression '+' expression {
388 $$ = $1 + $3;
389 }
390 | expression '%' expression {
391 if ($3 == 0) {
392 yyerror (& @1, parser,
393 "zero modulus in preprocessor directive");
394 } else {
395 $$ = $1 % $3;
396 }
397 }
398 | expression '/' expression {
399 if ($3 == 0) {
400 yyerror (& @1, parser,
401 "division by 0 in preprocessor directive");
402 } else {
403 $$ = $1 / $3;
404 }
405 }
406 | expression '*' expression {
407 $$ = $1 * $3;
408 }
409 | '!' expression %prec UNARY {
410 $$ = ! $2;
411 }
412 | '~' expression %prec UNARY {
413 $$ = ~ $2;
414 }
415 | '-' expression %prec UNARY {
416 $$ = - $2;
417 }
418 | '+' expression %prec UNARY {
419 $$ = + $2;
420 }
421 | '(' expression ')' {
422 $$ = $2;
423 }
424 ;
425
426 identifier_list:
427 IDENTIFIER {
428 $$ = _string_list_create (parser);
429 _string_list_append_item ($$, $1);
430 ralloc_steal ($$, $1);
431 }
432 | identifier_list ',' IDENTIFIER {
433 $$ = $1;
434 _string_list_append_item ($$, $3);
435 ralloc_steal ($$, $3);
436 }
437 ;
438
439 text_line:
440 NEWLINE { $$ = NULL; }
441 | pp_tokens NEWLINE
442 ;
443
444 non_directive:
445 pp_tokens NEWLINE {
446 yyerror (& @1, parser, "Invalid tokens after #");
447 }
448 ;
449
450 replacement_list:
451 /* empty */ { $$ = NULL; }
452 | pp_tokens
453 ;
454
455 junk:
456 /* empty */
457 | pp_tokens {
458 glcpp_warning(&@1, parser, "extra tokens at end of directive");
459 }
460 ;
461
462 conditional_token:
463 /* Handle "defined" operator */
464 DEFINED IDENTIFIER {
465 int v = hash_table_find (parser->defines, $2) ? 1 : 0;
466 $$ = _token_create_ival (parser, INTEGER, v);
467 }
468 | DEFINED '(' IDENTIFIER ')' {
469 int v = hash_table_find (parser->defines, $3) ? 1 : 0;
470 $$ = _token_create_ival (parser, INTEGER, v);
471 }
472 | preprocessing_token
473 ;
474
475 conditional_tokens:
476 /* Exactly the same as pp_tokens, but using conditional_token */
477 conditional_token {
478 $$ = _token_list_create (parser);
479 _token_list_append ($$, $1);
480 }
481 | conditional_tokens conditional_token {
482 $$ = $1;
483 _token_list_append ($$, $2);
484 }
485 ;
486
487 pp_tokens:
488 preprocessing_token {
489 parser->space_tokens = 1;
490 $$ = _token_list_create (parser);
491 _token_list_append ($$, $1);
492 }
493 | pp_tokens preprocessing_token {
494 $$ = $1;
495 _token_list_append ($$, $2);
496 }
497 ;
498
499 preprocessing_token:
500 IDENTIFIER {
501 $$ = _token_create_str (parser, IDENTIFIER, $1);
502 $$->location = yylloc;
503 }
504 | INTEGER_STRING {
505 $$ = _token_create_str (parser, INTEGER_STRING, $1);
506 $$->location = yylloc;
507 }
508 | operator {
509 $$ = _token_create_ival (parser, $1, $1);
510 $$->location = yylloc;
511 }
512 | OTHER {
513 $$ = _token_create_str (parser, OTHER, $1);
514 $$->location = yylloc;
515 }
516 | SPACE {
517 $$ = _token_create_ival (parser, SPACE, SPACE);
518 $$->location = yylloc;
519 }
520 ;
521
522 operator:
523 '[' { $$ = '['; }
524 | ']' { $$ = ']'; }
525 | '(' { $$ = '('; }
526 | ')' { $$ = ')'; }
527 | '{' { $$ = '{'; }
528 | '}' { $$ = '}'; }
529 | '.' { $$ = '.'; }
530 | '&' { $$ = '&'; }
531 | '*' { $$ = '*'; }
532 | '+' { $$ = '+'; }
533 | '-' { $$ = '-'; }
534 | '~' { $$ = '~'; }
535 | '!' { $$ = '!'; }
536 | '/' { $$ = '/'; }
537 | '%' { $$ = '%'; }
538 | LEFT_SHIFT { $$ = LEFT_SHIFT; }
539 | RIGHT_SHIFT { $$ = RIGHT_SHIFT; }
540 | '<' { $$ = '<'; }
541 | '>' { $$ = '>'; }
542 | LESS_OR_EQUAL { $$ = LESS_OR_EQUAL; }
543 | GREATER_OR_EQUAL { $$ = GREATER_OR_EQUAL; }
544 | EQUAL { $$ = EQUAL; }
545 | NOT_EQUAL { $$ = NOT_EQUAL; }
546 | '^' { $$ = '^'; }
547 | '|' { $$ = '|'; }
548 | AND { $$ = AND; }
549 | OR { $$ = OR; }
550 | ';' { $$ = ';'; }
551 | ',' { $$ = ','; }
552 | '=' { $$ = '='; }
553 | PASTE { $$ = PASTE; }
554 ;
555
556 %%
557
558 string_list_t *
559 _string_list_create (void *ctx)
560 {
561 string_list_t *list;
562
563 list = ralloc (ctx, string_list_t);
564 list->head = NULL;
565 list->tail = NULL;
566
567 return list;
568 }
569
570 void
571 _string_list_append_item (string_list_t *list, const char *str)
572 {
573 string_node_t *node;
574
575 node = ralloc (list, string_node_t);
576 node->str = ralloc_strdup (node, str);
577
578 node->next = NULL;
579
580 if (list->head == NULL) {
581 list->head = node;
582 } else {
583 list->tail->next = node;
584 }
585
586 list->tail = node;
587 }
588
589 int
590 _string_list_contains (string_list_t *list, const char *member, int *index)
591 {
592 string_node_t *node;
593 int i;
594
595 if (list == NULL)
596 return 0;
597
598 for (i = 0, node = list->head; node; i++, node = node->next) {
599 if (strcmp (node->str, member) == 0) {
600 if (index)
601 *index = i;
602 return 1;
603 }
604 }
605
606 return 0;
607 }
608
609 int
610 _string_list_length (string_list_t *list)
611 {
612 int length = 0;
613 string_node_t *node;
614
615 if (list == NULL)
616 return 0;
617
618 for (node = list->head; node; node = node->next)
619 length++;
620
621 return length;
622 }
623
624 int
625 _string_list_equal (string_list_t *a, string_list_t *b)
626 {
627 string_node_t *node_a, *node_b;
628
629 if (a == NULL && b == NULL)
630 return 1;
631
632 if (a == NULL || b == NULL)
633 return 0;
634
635 for (node_a = a->head, node_b = b->head;
636 node_a && node_b;
637 node_a = node_a->next, node_b = node_b->next)
638 {
639 if (strcmp (node_a->str, node_b->str))
640 return 0;
641 }
642
643 /* Catch the case of lists being different lengths, (which
644 * would cause the loop above to terminate after the shorter
645 * list). */
646 return node_a == node_b;
647 }
648
649 argument_list_t *
650 _argument_list_create (void *ctx)
651 {
652 argument_list_t *list;
653
654 list = ralloc (ctx, argument_list_t);
655 list->head = NULL;
656 list->tail = NULL;
657
658 return list;
659 }
660
661 void
662 _argument_list_append (argument_list_t *list, token_list_t *argument)
663 {
664 argument_node_t *node;
665
666 node = ralloc (list, argument_node_t);
667 node->argument = argument;
668
669 node->next = NULL;
670
671 if (list->head == NULL) {
672 list->head = node;
673 } else {
674 list->tail->next = node;
675 }
676
677 list->tail = node;
678 }
679
680 int
681 _argument_list_length (argument_list_t *list)
682 {
683 int length = 0;
684 argument_node_t *node;
685
686 if (list == NULL)
687 return 0;
688
689 for (node = list->head; node; node = node->next)
690 length++;
691
692 return length;
693 }
694
695 token_list_t *
696 _argument_list_member_at (argument_list_t *list, int index)
697 {
698 argument_node_t *node;
699 int i;
700
701 if (list == NULL)
702 return NULL;
703
704 node = list->head;
705 for (i = 0; i < index; i++) {
706 node = node->next;
707 if (node == NULL)
708 break;
709 }
710
711 if (node)
712 return node->argument;
713
714 return NULL;
715 }
716
717 /* Note: This function ralloc_steal()s the str pointer. */
718 token_t *
719 _token_create_str (void *ctx, int type, char *str)
720 {
721 token_t *token;
722
723 token = ralloc (ctx, token_t);
724 token->type = type;
725 token->value.str = str;
726
727 ralloc_steal (token, str);
728
729 return token;
730 }
731
732 token_t *
733 _token_create_ival (void *ctx, int type, int ival)
734 {
735 token_t *token;
736
737 token = ralloc (ctx, token_t);
738 token->type = type;
739 token->value.ival = ival;
740
741 return token;
742 }
743
744 token_list_t *
745 _token_list_create (void *ctx)
746 {
747 token_list_t *list;
748
749 list = ralloc (ctx, token_list_t);
750 list->head = NULL;
751 list->tail = NULL;
752 list->non_space_tail = NULL;
753
754 return list;
755 }
756
757 void
758 _token_list_append (token_list_t *list, token_t *token)
759 {
760 token_node_t *node;
761
762 node = ralloc (list, token_node_t);
763 node->token = token;
764 node->next = NULL;
765
766 ralloc_steal (list, token);
767
768 if (list->head == NULL) {
769 list->head = node;
770 } else {
771 list->tail->next = node;
772 }
773
774 list->tail = node;
775 if (token->type != SPACE)
776 list->non_space_tail = node;
777 }
778
779 void
780 _token_list_append_list (token_list_t *list, token_list_t *tail)
781 {
782 if (tail == NULL || tail->head == NULL)
783 return;
784
785 if (list->head == NULL) {
786 list->head = tail->head;
787 } else {
788 list->tail->next = tail->head;
789 }
790
791 list->tail = tail->tail;
792 list->non_space_tail = tail->non_space_tail;
793 }
794
795 static token_list_t *
796 _token_list_copy (void *ctx, token_list_t *other)
797 {
798 token_list_t *copy;
799 token_node_t *node;
800
801 if (other == NULL)
802 return NULL;
803
804 copy = _token_list_create (ctx);
805 for (node = other->head; node; node = node->next) {
806 token_t *new_token = ralloc (copy, token_t);
807 *new_token = *node->token;
808 _token_list_append (copy, new_token);
809 }
810
811 return copy;
812 }
813
814 static void
815 _token_list_trim_trailing_space (token_list_t *list)
816 {
817 token_node_t *tail, *next;
818
819 if (list->non_space_tail) {
820 tail = list->non_space_tail->next;
821 list->non_space_tail->next = NULL;
822 list->tail = list->non_space_tail;
823
824 while (tail) {
825 next = tail->next;
826 ralloc_free (tail);
827 tail = next;
828 }
829 }
830 }
831
832 static int
833 _token_list_is_empty_ignoring_space (token_list_t *l)
834 {
835 token_node_t *n;
836
837 if (l == NULL)
838 return 1;
839
840 n = l->head;
841 while (n != NULL && n->token->type == SPACE)
842 n = n->next;
843
844 return n == NULL;
845 }
846
847 int
848 _token_list_equal_ignoring_space (token_list_t *a, token_list_t *b)
849 {
850 token_node_t *node_a, *node_b;
851
852 if (a == NULL || b == NULL) {
853 int a_empty = _token_list_is_empty_ignoring_space(a);
854 int b_empty = _token_list_is_empty_ignoring_space(b);
855 return a_empty == b_empty;
856 }
857
858 node_a = a->head;
859 node_b = b->head;
860
861 while (1)
862 {
863 if (node_a == NULL && node_b == NULL)
864 break;
865
866 if (node_a == NULL || node_b == NULL)
867 return 0;
868
869 if (node_a->token->type == SPACE) {
870 node_a = node_a->next;
871 continue;
872 }
873
874 if (node_b->token->type == SPACE) {
875 node_b = node_b->next;
876 continue;
877 }
878
879 if (node_a->token->type != node_b->token->type)
880 return 0;
881
882 switch (node_a->token->type) {
883 case INTEGER:
884 if (node_a->token->value.ival !=
885 node_b->token->value.ival)
886 {
887 return 0;
888 }
889 break;
890 case IDENTIFIER:
891 case INTEGER_STRING:
892 case OTHER:
893 if (strcmp (node_a->token->value.str,
894 node_b->token->value.str))
895 {
896 return 0;
897 }
898 break;
899 }
900
901 node_a = node_a->next;
902 node_b = node_b->next;
903 }
904
905 return 1;
906 }
907
908 static void
909 _token_print (char **out, token_t *token)
910 {
911 if (token->type < 256) {
912 ralloc_asprintf_append (out, "%c", token->type);
913 return;
914 }
915
916 switch (token->type) {
917 case INTEGER:
918 ralloc_asprintf_append (out, "%" PRIiMAX, token->value.ival);
919 break;
920 case IDENTIFIER:
921 case INTEGER_STRING:
922 case OTHER:
923 ralloc_strcat (out, token->value.str);
924 break;
925 case SPACE:
926 ralloc_strcat (out, " ");
927 break;
928 case LEFT_SHIFT:
929 ralloc_strcat (out, "<<");
930 break;
931 case RIGHT_SHIFT:
932 ralloc_strcat (out, ">>");
933 break;
934 case LESS_OR_EQUAL:
935 ralloc_strcat (out, "<=");
936 break;
937 case GREATER_OR_EQUAL:
938 ralloc_strcat (out, ">=");
939 break;
940 case EQUAL:
941 ralloc_strcat (out, "==");
942 break;
943 case NOT_EQUAL:
944 ralloc_strcat (out, "!=");
945 break;
946 case AND:
947 ralloc_strcat (out, "&&");
948 break;
949 case OR:
950 ralloc_strcat (out, "||");
951 break;
952 case PASTE:
953 ralloc_strcat (out, "##");
954 break;
955 case COMMA_FINAL:
956 ralloc_strcat (out, ",");
957 break;
958 case PLACEHOLDER:
959 /* Nothing to print. */
960 break;
961 default:
962 assert(!"Error: Don't know how to print token.");
963 break;
964 }
965 }
966
967 /* Return a new token (ralloc()ed off of 'token') formed by pasting
968 * 'token' and 'other'. Note that this function may return 'token' or
969 * 'other' directly rather than allocating anything new.
970 *
971 * Caution: Only very cursory error-checking is performed to see if
972 * the final result is a valid single token. */
973 static token_t *
974 _token_paste (glcpp_parser_t *parser, token_t *token, token_t *other)
975 {
976 token_t *combined = NULL;
977
978 /* Pasting a placeholder onto anything makes no change. */
979 if (other->type == PLACEHOLDER)
980 return token;
981
982 /* When 'token' is a placeholder, just return 'other'. */
983 if (token->type == PLACEHOLDER)
984 return other;
985
986 /* A very few single-character punctuators can be combined
987 * with another to form a multi-character punctuator. */
988 switch (token->type) {
989 case '<':
990 if (other->type == '<')
991 combined = _token_create_ival (token, LEFT_SHIFT, LEFT_SHIFT);
992 else if (other->type == '=')
993 combined = _token_create_ival (token, LESS_OR_EQUAL, LESS_OR_EQUAL);
994 break;
995 case '>':
996 if (other->type == '>')
997 combined = _token_create_ival (token, RIGHT_SHIFT, RIGHT_SHIFT);
998 else if (other->type == '=')
999 combined = _token_create_ival (token, GREATER_OR_EQUAL, GREATER_OR_EQUAL);
1000 break;
1001 case '=':
1002 if (other->type == '=')
1003 combined = _token_create_ival (token, EQUAL, EQUAL);
1004 break;
1005 case '!':
1006 if (other->type == '=')
1007 combined = _token_create_ival (token, NOT_EQUAL, NOT_EQUAL);
1008 break;
1009 case '&':
1010 if (other->type == '&')
1011 combined = _token_create_ival (token, AND, AND);
1012 break;
1013 case '|':
1014 if (other->type == '|')
1015 combined = _token_create_ival (token, OR, OR);
1016 break;
1017 }
1018
1019 if (combined != NULL) {
1020 /* Inherit the location from the first token */
1021 combined->location = token->location;
1022 return combined;
1023 }
1024
1025 /* Two string-valued tokens can usually just be mashed
1026 * together.
1027 *
1028 * XXX: This isn't actually legitimate. Several things here
1029 * should result in a diagnostic since the result cannot be a
1030 * valid, single pre-processing token. For example, pasting
1031 * "123" and "abc" is not legal, but we don't catch that
1032 * here. */
1033 if ((token->type == IDENTIFIER || token->type == OTHER || token->type == INTEGER_STRING) &&
1034 (other->type == IDENTIFIER || other->type == OTHER || other->type == INTEGER_STRING))
1035 {
1036 char *str;
1037
1038 str = ralloc_asprintf (token, "%s%s", token->value.str,
1039 other->value.str);
1040 combined = _token_create_str (token, token->type, str);
1041 combined->location = token->location;
1042 return combined;
1043 }
1044
1045 glcpp_error (&token->location, parser, "");
1046 ralloc_strcat (&parser->info_log, "Pasting \"");
1047 _token_print (&parser->info_log, token);
1048 ralloc_strcat (&parser->info_log, "\" and \"");
1049 _token_print (&parser->info_log, other);
1050 ralloc_strcat (&parser->info_log, "\" does not give a valid preprocessing token.\n");
1051
1052 return token;
1053 }
1054
1055 static void
1056 _token_list_print (glcpp_parser_t *parser, token_list_t *list)
1057 {
1058 token_node_t *node;
1059
1060 if (list == NULL)
1061 return;
1062
1063 for (node = list->head; node; node = node->next)
1064 _token_print (&parser->output, node->token);
1065 }
1066
1067 void
1068 yyerror (YYLTYPE *locp, glcpp_parser_t *parser, const char *error)
1069 {
1070 glcpp_error(locp, parser, "%s", error);
1071 }
1072
1073 static void add_builtin_define(glcpp_parser_t *parser,
1074 const char *name, int value)
1075 {
1076 token_t *tok;
1077 token_list_t *list;
1078
1079 tok = _token_create_ival (parser, INTEGER, value);
1080
1081 list = _token_list_create(parser);
1082 _token_list_append(list, tok);
1083 _define_object_macro(parser, NULL, name, list);
1084 }
1085
1086 glcpp_parser_t *
1087 glcpp_parser_create (const struct gl_extensions *extensions, int api)
1088 {
1089 glcpp_parser_t *parser;
1090 int language_version;
1091
1092 parser = ralloc (NULL, glcpp_parser_t);
1093
1094 glcpp_lex_init_extra (parser, &parser->scanner);
1095 parser->defines = hash_table_ctor (32, hash_table_string_hash,
1096 hash_table_string_compare);
1097 parser->active = NULL;
1098 parser->lexing_if = 0;
1099 parser->space_tokens = 1;
1100 parser->newline_as_space = 0;
1101 parser->in_control_line = 0;
1102 parser->paren_count = 0;
1103
1104 parser->skip_stack = NULL;
1105
1106 parser->lex_from_list = NULL;
1107 parser->lex_from_node = NULL;
1108
1109 parser->output = ralloc_strdup(parser, "");
1110 parser->info_log = ralloc_strdup(parser, "");
1111 parser->error = 0;
1112
1113 /* Add pre-defined macros. */
1114 add_builtin_define(parser, "GL_ARB_draw_buffers", 1);
1115 add_builtin_define(parser, "GL_ARB_texture_rectangle", 1);
1116
1117 if (api == API_OPENGLES2)
1118 add_builtin_define(parser, "GL_ES", 1);
1119
1120 if (extensions != NULL) {
1121 if (extensions->EXT_texture_array) {
1122 add_builtin_define(parser, "GL_EXT_texture_array", 1);
1123 }
1124
1125 if (extensions->ARB_fragment_coord_conventions)
1126 add_builtin_define(parser, "GL_ARB_fragment_coord_conventions",
1127 1);
1128
1129 if (extensions->ARB_explicit_attrib_location)
1130 add_builtin_define(parser, "GL_ARB_explicit_attrib_location", 1);
1131
1132 if (extensions->ARB_shader_texture_lod)
1133 add_builtin_define(parser, "GL_ARB_shader_texture_lod", 1);
1134
1135 if (extensions->AMD_conservative_depth) {
1136 add_builtin_define(parser, "GL_AMD_conservative_depth", 1);
1137 add_builtin_define(parser, "GL_ARB_conservative_depth", 1);
1138 }
1139 }
1140
1141 language_version = 110;
1142 add_builtin_define(parser, "__VERSION__", language_version);
1143
1144 return parser;
1145 }
1146
1147 int
1148 glcpp_parser_parse (glcpp_parser_t *parser)
1149 {
1150 return yyparse (parser);
1151 }
1152
1153 void
1154 glcpp_parser_destroy (glcpp_parser_t *parser)
1155 {
1156 glcpp_lex_destroy (parser->scanner);
1157 hash_table_dtor (parser->defines);
1158 ralloc_free (parser);
1159 }
1160
1161 typedef enum function_status
1162 {
1163 FUNCTION_STATUS_SUCCESS,
1164 FUNCTION_NOT_A_FUNCTION,
1165 FUNCTION_UNBALANCED_PARENTHESES
1166 } function_status_t;
1167
1168 /* Find a set of function-like macro arguments by looking for a
1169 * balanced set of parentheses.
1170 *
1171 * When called, 'node' should be the opening-parenthesis token, (or
1172 * perhaps preceeding SPACE tokens). Upon successful return *last will
1173 * be the last consumed node, (corresponding to the closing right
1174 * parenthesis).
1175 *
1176 * Return values:
1177 *
1178 * FUNCTION_STATUS_SUCCESS:
1179 *
1180 * Successfully parsed a set of function arguments.
1181 *
1182 * FUNCTION_NOT_A_FUNCTION:
1183 *
1184 * Macro name not followed by a '('. This is not an error, but
1185 * simply that the macro name should be treated as a non-macro.
1186 *
1187 * FUNCTION_UNBALANCED_PARENTHESES
1188 *
1189 * Macro name is not followed by a balanced set of parentheses.
1190 */
1191 static function_status_t
1192 _arguments_parse (argument_list_t *arguments,
1193 token_node_t *node,
1194 token_node_t **last)
1195 {
1196 token_list_t *argument;
1197 int paren_count;
1198
1199 node = node->next;
1200
1201 /* Ignore whitespace before first parenthesis. */
1202 while (node && node->token->type == SPACE)
1203 node = node->next;
1204
1205 if (node == NULL || node->token->type != '(')
1206 return FUNCTION_NOT_A_FUNCTION;
1207
1208 node = node->next;
1209
1210 argument = _token_list_create (arguments);
1211 _argument_list_append (arguments, argument);
1212
1213 for (paren_count = 1; node; node = node->next) {
1214 if (node->token->type == '(')
1215 {
1216 paren_count++;
1217 }
1218 else if (node->token->type == ')')
1219 {
1220 paren_count--;
1221 if (paren_count == 0)
1222 break;
1223 }
1224
1225 if (node->token->type == ',' &&
1226 paren_count == 1)
1227 {
1228 _token_list_trim_trailing_space (argument);
1229 argument = _token_list_create (arguments);
1230 _argument_list_append (arguments, argument);
1231 }
1232 else {
1233 if (argument->head == NULL) {
1234 /* Don't treat initial whitespace as
1235 * part of the arguement. */
1236 if (node->token->type == SPACE)
1237 continue;
1238 }
1239 _token_list_append (argument, node->token);
1240 }
1241 }
1242
1243 if (paren_count)
1244 return FUNCTION_UNBALANCED_PARENTHESES;
1245
1246 *last = node;
1247
1248 return FUNCTION_STATUS_SUCCESS;
1249 }
1250
1251 static token_list_t *
1252 _token_list_create_with_one_space (void *ctx)
1253 {
1254 token_list_t *list;
1255 token_t *space;
1256
1257 list = _token_list_create (ctx);
1258 space = _token_create_ival (list, SPACE, SPACE);
1259 _token_list_append (list, space);
1260
1261 return list;
1262 }
1263
1264 static void
1265 _glcpp_parser_expand_if (glcpp_parser_t *parser, int type, token_list_t *list)
1266 {
1267 token_list_t *expanded;
1268 token_t *token;
1269
1270 expanded = _token_list_create (parser);
1271 token = _token_create_ival (parser, type, type);
1272 _token_list_append (expanded, token);
1273 _glcpp_parser_expand_token_list (parser, list);
1274 _token_list_append_list (expanded, list);
1275 glcpp_parser_lex_from (parser, expanded);
1276 }
1277
1278 /* This is a helper function that's essentially part of the
1279 * implementation of _glcpp_parser_expand_node. It shouldn't be called
1280 * except for by that function.
1281 *
1282 * Returns NULL if node is a simple token with no expansion, (that is,
1283 * although 'node' corresponds to an identifier defined as a
1284 * function-like macro, it is not followed with a parenthesized
1285 * argument list).
1286 *
1287 * Compute the complete expansion of node (which is a function-like
1288 * macro) and subsequent nodes which are arguments.
1289 *
1290 * Returns the token list that results from the expansion and sets
1291 * *last to the last node in the list that was consumed by the
1292 * expansion. Specifically, *last will be set as follows: as the
1293 * token of the closing right parenthesis.
1294 */
1295 static token_list_t *
1296 _glcpp_parser_expand_function (glcpp_parser_t *parser,
1297 token_node_t *node,
1298 token_node_t **last)
1299
1300 {
1301 macro_t *macro;
1302 const char *identifier;
1303 argument_list_t *arguments;
1304 function_status_t status;
1305 token_list_t *substituted;
1306 int parameter_index;
1307
1308 identifier = node->token->value.str;
1309
1310 macro = hash_table_find (parser->defines, identifier);
1311
1312 assert (macro->is_function);
1313
1314 arguments = _argument_list_create (parser);
1315 status = _arguments_parse (arguments, node, last);
1316
1317 switch (status) {
1318 case FUNCTION_STATUS_SUCCESS:
1319 break;
1320 case FUNCTION_NOT_A_FUNCTION:
1321 return NULL;
1322 case FUNCTION_UNBALANCED_PARENTHESES:
1323 glcpp_error (&node->token->location, parser, "Macro %s call has unbalanced parentheses\n", identifier);
1324 return NULL;
1325 }
1326
1327 /* Replace a macro defined as empty with a SPACE token. */
1328 if (macro->replacements == NULL) {
1329 ralloc_free (arguments);
1330 return _token_list_create_with_one_space (parser);
1331 }
1332
1333 if (! ((_argument_list_length (arguments) ==
1334 _string_list_length (macro->parameters)) ||
1335 (_string_list_length (macro->parameters) == 0 &&
1336 _argument_list_length (arguments) == 1 &&
1337 arguments->head->argument->head == NULL)))
1338 {
1339 glcpp_error (&node->token->location, parser,
1340 "Error: macro %s invoked with %d arguments (expected %d)\n",
1341 identifier,
1342 _argument_list_length (arguments),
1343 _string_list_length (macro->parameters));
1344 return NULL;
1345 }
1346
1347 /* Perform argument substitution on the replacement list. */
1348 substituted = _token_list_create (arguments);
1349
1350 for (node = macro->replacements->head; node; node = node->next)
1351 {
1352 if (node->token->type == IDENTIFIER &&
1353 _string_list_contains (macro->parameters,
1354 node->token->value.str,
1355 &parameter_index))
1356 {
1357 token_list_t *argument;
1358 argument = _argument_list_member_at (arguments,
1359 parameter_index);
1360 /* Before substituting, we expand the argument
1361 * tokens, or append a placeholder token for
1362 * an empty argument. */
1363 if (argument->head) {
1364 token_list_t *expanded_argument;
1365 expanded_argument = _token_list_copy (parser,
1366 argument);
1367 _glcpp_parser_expand_token_list (parser,
1368 expanded_argument);
1369 _token_list_append_list (substituted,
1370 expanded_argument);
1371 } else {
1372 token_t *new_token;
1373
1374 new_token = _token_create_ival (substituted,
1375 PLACEHOLDER,
1376 PLACEHOLDER);
1377 _token_list_append (substituted, new_token);
1378 }
1379 } else {
1380 _token_list_append (substituted, node->token);
1381 }
1382 }
1383
1384 /* After argument substitution, and before further expansion
1385 * below, implement token pasting. */
1386
1387 _token_list_trim_trailing_space (substituted);
1388
1389 node = substituted->head;
1390 while (node)
1391 {
1392 token_node_t *next_non_space;
1393
1394 /* Look ahead for a PASTE token, skipping space. */
1395 next_non_space = node->next;
1396 while (next_non_space && next_non_space->token->type == SPACE)
1397 next_non_space = next_non_space->next;
1398
1399 if (next_non_space == NULL)
1400 break;
1401
1402 if (next_non_space->token->type != PASTE) {
1403 node = next_non_space;
1404 continue;
1405 }
1406
1407 /* Now find the next non-space token after the PASTE. */
1408 next_non_space = next_non_space->next;
1409 while (next_non_space && next_non_space->token->type == SPACE)
1410 next_non_space = next_non_space->next;
1411
1412 if (next_non_space == NULL) {
1413 yyerror (&node->token->location, parser, "'##' cannot appear at either end of a macro expansion\n");
1414 return NULL;
1415 }
1416
1417 node->token = _token_paste (parser, node->token, next_non_space->token);
1418 node->next = next_non_space->next;
1419 if (next_non_space == substituted->tail)
1420 substituted->tail = node;
1421
1422 node = node->next;
1423 }
1424
1425 substituted->non_space_tail = substituted->tail;
1426
1427 return substituted;
1428 }
1429
1430 /* Compute the complete expansion of node, (and subsequent nodes after
1431 * 'node' in the case that 'node' is a function-like macro and
1432 * subsequent nodes are arguments).
1433 *
1434 * Returns NULL if node is a simple token with no expansion.
1435 *
1436 * Otherwise, returns the token list that results from the expansion
1437 * and sets *last to the last node in the list that was consumed by
1438 * the expansion. Specifically, *last will be set as follows:
1439 *
1440 * As 'node' in the case of object-like macro expansion.
1441 *
1442 * As the token of the closing right parenthesis in the case of
1443 * function-like macro expansion.
1444 */
1445 static token_list_t *
1446 _glcpp_parser_expand_node (glcpp_parser_t *parser,
1447 token_node_t *node,
1448 token_node_t **last)
1449 {
1450 token_t *token = node->token;
1451 const char *identifier;
1452 macro_t *macro;
1453
1454 /* We only expand identifiers */
1455 if (token->type != IDENTIFIER) {
1456 /* We change any COMMA into a COMMA_FINAL to prevent
1457 * it being mistaken for an argument separator
1458 * later. */
1459 if (token->type == ',') {
1460 token->type = COMMA_FINAL;
1461 token->value.ival = COMMA_FINAL;
1462 }
1463
1464 return NULL;
1465 }
1466
1467 /* Look up this identifier in the hash table. */
1468 identifier = token->value.str;
1469 macro = hash_table_find (parser->defines, identifier);
1470
1471 /* Not a macro, so no expansion needed. */
1472 if (macro == NULL)
1473 return NULL;
1474
1475 /* Finally, don't expand this macro if we're already actively
1476 * expanding it, (to avoid infinite recursion). */
1477 if (_parser_active_list_contains (parser, identifier)) {
1478 /* We change the token type here from IDENTIFIER to
1479 * OTHER to prevent any future expansion of this
1480 * unexpanded token. */
1481 char *str;
1482 token_list_t *expansion;
1483 token_t *final;
1484
1485 str = ralloc_strdup (parser, token->value.str);
1486 final = _token_create_str (parser, OTHER, str);
1487 expansion = _token_list_create (parser);
1488 _token_list_append (expansion, final);
1489 *last = node;
1490 return expansion;
1491 }
1492
1493 if (! macro->is_function)
1494 {
1495 *last = node;
1496
1497 /* Replace a macro defined as empty with a SPACE token. */
1498 if (macro->replacements == NULL)
1499 return _token_list_create_with_one_space (parser);
1500
1501 return _token_list_copy (parser, macro->replacements);
1502 }
1503
1504 return _glcpp_parser_expand_function (parser, node, last);
1505 }
1506
1507 /* Push a new identifier onto the parser's active list.
1508 *
1509 * Here, 'marker' is the token node that appears in the list after the
1510 * expansion of 'identifier'. That is, when the list iterator begins
1511 * examining 'marker', then it is time to pop this node from the
1512 * active stack.
1513 */
1514 static void
1515 _parser_active_list_push (glcpp_parser_t *parser,
1516 const char *identifier,
1517 token_node_t *marker)
1518 {
1519 active_list_t *node;
1520
1521 node = ralloc (parser->active, active_list_t);
1522 node->identifier = ralloc_strdup (node, identifier);
1523 node->marker = marker;
1524 node->next = parser->active;
1525
1526 parser->active = node;
1527 }
1528
1529 static void
1530 _parser_active_list_pop (glcpp_parser_t *parser)
1531 {
1532 active_list_t *node = parser->active;
1533
1534 if (node == NULL) {
1535 parser->active = NULL;
1536 return;
1537 }
1538
1539 node = parser->active->next;
1540 ralloc_free (parser->active);
1541
1542 parser->active = node;
1543 }
1544
1545 static int
1546 _parser_active_list_contains (glcpp_parser_t *parser, const char *identifier)
1547 {
1548 active_list_t *node;
1549
1550 if (parser->active == NULL)
1551 return 0;
1552
1553 for (node = parser->active; node; node = node->next)
1554 if (strcmp (node->identifier, identifier) == 0)
1555 return 1;
1556
1557 return 0;
1558 }
1559
1560 /* Walk over the token list replacing nodes with their expansion.
1561 * Whenever nodes are expanded the walking will walk over the new
1562 * nodes, continuing to expand as necessary. The results are placed in
1563 * 'list' itself;
1564 */
1565 static void
1566 _glcpp_parser_expand_token_list (glcpp_parser_t *parser,
1567 token_list_t *list)
1568 {
1569 token_node_t *node_prev;
1570 token_node_t *node, *last = NULL;
1571 token_list_t *expansion;
1572 active_list_t *active_initial = parser->active;
1573
1574 if (list == NULL)
1575 return;
1576
1577 _token_list_trim_trailing_space (list);
1578
1579 node_prev = NULL;
1580 node = list->head;
1581
1582 while (node) {
1583
1584 while (parser->active && parser->active->marker == node)
1585 _parser_active_list_pop (parser);
1586
1587 expansion = _glcpp_parser_expand_node (parser, node, &last);
1588 if (expansion) {
1589 token_node_t *n;
1590
1591 for (n = node; n != last->next; n = n->next)
1592 while (parser->active &&
1593 parser->active->marker == n)
1594 {
1595 _parser_active_list_pop (parser);
1596 }
1597
1598 _parser_active_list_push (parser,
1599 node->token->value.str,
1600 last->next);
1601
1602 /* Splice expansion into list, supporting a
1603 * simple deletion if the expansion is
1604 * empty. */
1605 if (expansion->head) {
1606 if (node_prev)
1607 node_prev->next = expansion->head;
1608 else
1609 list->head = expansion->head;
1610 expansion->tail->next = last->next;
1611 if (last == list->tail)
1612 list->tail = expansion->tail;
1613 } else {
1614 if (node_prev)
1615 node_prev->next = last->next;
1616 else
1617 list->head = last->next;
1618 if (last == list->tail)
1619 list->tail = NULL;
1620 }
1621 } else {
1622 node_prev = node;
1623 }
1624 node = node_prev ? node_prev->next : list->head;
1625 }
1626
1627 /* Remove any lingering effects of this invocation on the
1628 * active list. That is, pop until the list looks like it did
1629 * at the beginning of this function. */
1630 while (parser->active && parser->active != active_initial)
1631 _parser_active_list_pop (parser);
1632
1633 list->non_space_tail = list->tail;
1634 }
1635
1636 void
1637 _glcpp_parser_print_expanded_token_list (glcpp_parser_t *parser,
1638 token_list_t *list)
1639 {
1640 if (list == NULL)
1641 return;
1642
1643 _glcpp_parser_expand_token_list (parser, list);
1644
1645 _token_list_trim_trailing_space (list);
1646
1647 _token_list_print (parser, list);
1648 }
1649
1650 static void
1651 _check_for_reserved_macro_name (glcpp_parser_t *parser, YYLTYPE *loc,
1652 const char *identifier)
1653 {
1654 /* According to the GLSL specification, macro names starting with "__"
1655 * or "GL_" are reserved for future use. So, don't allow them.
1656 */
1657 if (strncmp(identifier, "__", 2) == 0) {
1658 glcpp_error (loc, parser, "Macro names starting with \"__\" are reserved.\n");
1659 }
1660 if (strncmp(identifier, "GL_", 3) == 0) {
1661 glcpp_error (loc, parser, "Macro names starting with \"GL_\" are reserved.\n");
1662 }
1663 }
1664
1665 static int
1666 _macro_equal (macro_t *a, macro_t *b)
1667 {
1668 if (a->is_function != b->is_function)
1669 return 0;
1670
1671 if (a->is_function) {
1672 if (! _string_list_equal (a->parameters, b->parameters))
1673 return 0;
1674 }
1675
1676 return _token_list_equal_ignoring_space (a->replacements,
1677 b->replacements);
1678 }
1679
1680 void
1681 _define_object_macro (glcpp_parser_t *parser,
1682 YYLTYPE *loc,
1683 const char *identifier,
1684 token_list_t *replacements)
1685 {
1686 macro_t *macro, *previous;
1687
1688 if (loc != NULL)
1689 _check_for_reserved_macro_name(parser, loc, identifier);
1690
1691 macro = ralloc (parser, macro_t);
1692
1693 macro->is_function = 0;
1694 macro->parameters = NULL;
1695 macro->identifier = ralloc_strdup (macro, identifier);
1696 macro->replacements = replacements;
1697 ralloc_steal (macro, replacements);
1698
1699 previous = hash_table_find (parser->defines, identifier);
1700 if (previous) {
1701 if (_macro_equal (macro, previous)) {
1702 ralloc_free (macro);
1703 return;
1704 }
1705 glcpp_error (loc, parser, "Redefinition of macro %s\n",
1706 identifier);
1707 }
1708
1709 hash_table_insert (parser->defines, macro, identifier);
1710 }
1711
1712 void
1713 _define_function_macro (glcpp_parser_t *parser,
1714 YYLTYPE *loc,
1715 const char *identifier,
1716 string_list_t *parameters,
1717 token_list_t *replacements)
1718 {
1719 macro_t *macro, *previous;
1720
1721 _check_for_reserved_macro_name(parser, loc, identifier);
1722
1723 macro = ralloc (parser, macro_t);
1724 ralloc_steal (macro, parameters);
1725 ralloc_steal (macro, replacements);
1726
1727 macro->is_function = 1;
1728 macro->parameters = parameters;
1729 macro->identifier = ralloc_strdup (macro, identifier);
1730 macro->replacements = replacements;
1731 previous = hash_table_find (parser->defines, identifier);
1732 if (previous) {
1733 if (_macro_equal (macro, previous)) {
1734 ralloc_free (macro);
1735 return;
1736 }
1737 glcpp_error (loc, parser, "Redefinition of macro %s\n",
1738 identifier);
1739 }
1740
1741 hash_table_insert (parser->defines, macro, identifier);
1742 }
1743
1744 static int
1745 glcpp_parser_lex (YYSTYPE *yylval, YYLTYPE *yylloc, glcpp_parser_t *parser)
1746 {
1747 token_node_t *node;
1748 int ret;
1749
1750 if (parser->lex_from_list == NULL) {
1751 ret = glcpp_lex (yylval, yylloc, parser->scanner);
1752
1753 /* XXX: This ugly block of code exists for the sole
1754 * purpose of converting a NEWLINE token into a SPACE
1755 * token, but only in the case where we have seen a
1756 * function-like macro name, but have not yet seen its
1757 * closing parenthesis.
1758 *
1759 * There's perhaps a more compact way to do this with
1760 * mid-rule actions in the grammar.
1761 *
1762 * I'm definitely not pleased with the complexity of
1763 * this code here.
1764 */
1765 if (parser->newline_as_space)
1766 {
1767 if (ret == '(') {
1768 parser->paren_count++;
1769 } else if (ret == ')') {
1770 parser->paren_count--;
1771 if (parser->paren_count == 0)
1772 parser->newline_as_space = 0;
1773 } else if (ret == NEWLINE) {
1774 ret = SPACE;
1775 } else if (ret != SPACE) {
1776 if (parser->paren_count == 0)
1777 parser->newline_as_space = 0;
1778 }
1779 }
1780 else if (parser->in_control_line)
1781 {
1782 if (ret == NEWLINE)
1783 parser->in_control_line = 0;
1784 }
1785 else if (ret == HASH_DEFINE_OBJ || ret == HASH_DEFINE_FUNC ||
1786 ret == HASH_UNDEF || ret == HASH_IF ||
1787 ret == HASH_IFDEF || ret == HASH_IFNDEF ||
1788 ret == HASH_ELIF || ret == HASH_ELSE ||
1789 ret == HASH_ENDIF || ret == HASH)
1790 {
1791 parser->in_control_line = 1;
1792 }
1793 else if (ret == IDENTIFIER)
1794 {
1795 macro_t *macro;
1796 macro = hash_table_find (parser->defines,
1797 yylval->str);
1798 if (macro && macro->is_function) {
1799 parser->newline_as_space = 1;
1800 parser->paren_count = 0;
1801 }
1802 }
1803
1804 return ret;
1805 }
1806
1807 node = parser->lex_from_node;
1808
1809 if (node == NULL) {
1810 ralloc_free (parser->lex_from_list);
1811 parser->lex_from_list = NULL;
1812 return NEWLINE;
1813 }
1814
1815 *yylval = node->token->value;
1816 ret = node->token->type;
1817
1818 parser->lex_from_node = node->next;
1819
1820 return ret;
1821 }
1822
1823 static void
1824 glcpp_parser_lex_from (glcpp_parser_t *parser, token_list_t *list)
1825 {
1826 token_node_t *node;
1827
1828 assert (parser->lex_from_list == NULL);
1829
1830 /* Copy list, eliminating any space tokens. */
1831 parser->lex_from_list = _token_list_create (parser);
1832
1833 for (node = list->head; node; node = node->next) {
1834 if (node->token->type == SPACE)
1835 continue;
1836 _token_list_append (parser->lex_from_list, node->token);
1837 }
1838
1839 ralloc_free (list);
1840
1841 parser->lex_from_node = parser->lex_from_list->head;
1842
1843 /* It's possible the list consisted of nothing but whitespace. */
1844 if (parser->lex_from_node == NULL) {
1845 ralloc_free (parser->lex_from_list);
1846 parser->lex_from_list = NULL;
1847 }
1848 }
1849
1850 static void
1851 _glcpp_parser_skip_stack_push_if (glcpp_parser_t *parser, YYLTYPE *loc,
1852 int condition)
1853 {
1854 skip_type_t current = SKIP_NO_SKIP;
1855 skip_node_t *node;
1856
1857 if (parser->skip_stack)
1858 current = parser->skip_stack->type;
1859
1860 node = ralloc (parser, skip_node_t);
1861 node->loc = *loc;
1862
1863 if (current == SKIP_NO_SKIP) {
1864 if (condition)
1865 node->type = SKIP_NO_SKIP;
1866 else
1867 node->type = SKIP_TO_ELSE;
1868 } else {
1869 node->type = SKIP_TO_ENDIF;
1870 }
1871
1872 node->next = parser->skip_stack;
1873 parser->skip_stack = node;
1874 }
1875
1876 static void
1877 _glcpp_parser_skip_stack_change_if (glcpp_parser_t *parser, YYLTYPE *loc,
1878 const char *type, int condition)
1879 {
1880 if (parser->skip_stack == NULL) {
1881 glcpp_error (loc, parser, "%s without #if\n", type);
1882 return;
1883 }
1884
1885 if (parser->skip_stack->type == SKIP_TO_ELSE) {
1886 if (condition)
1887 parser->skip_stack->type = SKIP_NO_SKIP;
1888 } else {
1889 parser->skip_stack->type = SKIP_TO_ENDIF;
1890 }
1891 }
1892
1893 static void
1894 _glcpp_parser_skip_stack_pop (glcpp_parser_t *parser, YYLTYPE *loc)
1895 {
1896 skip_node_t *node;
1897
1898 if (parser->skip_stack == NULL) {
1899 glcpp_error (loc, parser, "#endif without #if\n");
1900 return;
1901 }
1902
1903 node = parser->skip_stack;
1904 parser->skip_stack = node->next;
1905 ralloc_free (node);
1906 }