2 * Mesa 3-D graphics library
5 * Copyright (C) 2005-2006 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 * \file slang_preprocess.c
32 #include "shader/grammar/grammar_mesa.h"
33 #include "slang_preprocess.h"
35 LONGSTRING
static const char *slang_pp_directives_syn
=
36 #include "library/slang_pp_directives_syn.h"
39 LONGSTRING
static const char *slang_pp_expression_syn
=
40 #include "library/slang_pp_expression_syn.h"
43 LONGSTRING
static const char *slang_pp_version_syn
=
44 #include "library/slang_pp_version_syn.h"
48 grammar_error_to_log (slang_info_log
*log
)
53 grammar_get_last_error ((byte
*) (buf
), sizeof (buf
), &pos
);
54 slang_info_log_error (log
, buf
);
58 _slang_preprocess_version (const char *text
, GLuint
*version
, GLuint
*eaten
, slang_info_log
*log
)
64 id
= grammar_load_from_text ((const byte
*) (slang_pp_version_syn
));
66 grammar_error_to_log (log
);
70 if (!grammar_fast_check (id
, (const byte
*) (text
), &prod
, &size
, 8)) {
71 grammar_error_to_log (log
);
76 /* there can be multiple #version directives - grab the last one */
78 *version
= (GLuint
) (I
[0]) + (GLuint
) (I
[1]) * 100;
79 *eaten
= (GLuint
) (I
[2]) + ((GLuint
) (I
[3]) << 8) + ((GLuint
) (I
[4]) << 16) + ((GLuint
) (I
[5]) << 24);
82 grammar_alloc_free (prod
);
87 * The preprocessor does the following work.
88 * 1. Remove comments. Each comment block is replaced with a single space and if the
89 * block contains new-lines, they are preserved. This ensures that line numbers
90 * stay the same and if a comment block delimits two tokens, the are delitmited
91 * by the space after comment removal.
92 * 2. Remove preprocessor directives from the source string, checking their syntax and
93 * executing them if appropriate. Again, new-lines are preserved.
95 * 4. Tokenize the source string by ensuring there is at least one space between every
96 * two adjacent tokens.
102 pp_annotate (slang_string
*output
, const char *fmt
, ...)
109 _mesa_vsprintf (buffer
, fmt
, va
);
111 slang_string_pushs (output
, buffer
, _mesa_strlen (buffer
));
119 * The expression is executed on a fixed-sized stack. The PUSH macro makes a runtime
120 * check if the stack is not overflown by too complex expressions. In that situation the
121 * GLSL preprocessor should report internal compiler error.
122 * The BINARYDIV makes a runtime check if the divider is not 0. If it is, it reports
126 #define EXECUTION_STACK_SIZE 1024
131 slang_info_log_error (elog, "internal compiler error: preprocessor execution stack overflow.");\
139 assert (sp < EXECUTION_STACK_SIZE);\
151 #define BINARYDIV(op)\
157 slang_info_log_error (elog, "division by zero in preprocessor expression.");\
172 #define OP_LOGICALOR 2
173 #define OP_LOGICALAND 3
178 #define OP_NOTEQUAL 8
179 #define OP_LESSEQUAL 9
180 #define OP_GREATEREQUAL 10
182 #define OP_GREATER 12
183 #define OP_LEFTSHIFT 13
184 #define OP_RIGHTSHIFT 14
186 #define OP_SUBTRACT 16
187 #define OP_MULTIPLY 17
189 #define OP_MODULUS 19
193 #define OP_COMPLEMENT 23
196 execute_expression (slang_string
*output
, const byte
*code
, GLuint
*pi
, GLint
*result
,
197 slang_info_log
*elog
)
200 GLint stack
[EXECUTION_STACK_SIZE
];
201 GLuint sp
= EXECUTION_STACK_SIZE
;
203 while (code
[i
] != OP_END
) {
207 PUSH(_mesa_atoi ((const char *) (&code
[i
])));
208 i
+= _mesa_strlen ((const char *) (&code
[i
])) + 1;
234 case OP_GREATEREQUAL
:
281 /* Write-back the index skipping the OP_END. */
284 /* There should be exactly one value left on the stack. This is our result. */
286 pp_annotate (output
, "%d ", *result
);
287 assert (sp
== EXECUTION_STACK_SIZE
);
292 * Function execute_expressions() executes up to 2 expressions. The second expression is there
293 * for the #line directive which takes 1 or 2 expressions that indicate line and file numbers.
294 * If it fails, it returns 0. If it succeeds, it returns the number of executed expressions.
298 #define EXP_EXPRESSION 1
301 execute_expressions (slang_string
*output
, grammar eid
, const byte
*expr
, GLint results
[2],
302 slang_info_log
*elog
)
306 GLuint size
, count
= 0;
308 success
= grammar_fast_check (eid
, expr
, &code
, &size
, 64);
312 while (code
[i
++] == EXP_EXPRESSION
) {
315 if (!execute_expression (output
, code
, &i
, &results
[count
], elog
)) {
321 grammar_alloc_free (code
);
324 slang_info_log_error (elog
, "syntax error in preprocessor expression.");\
330 * The pp_symbol structure is used to hold macro definitions and macro formal parameters. The
331 * pp_symbols strcture is a collection of pp_symbol. It is used both for storing macro formal
332 * parameters and all global macro definitions. Making this unification wastes some memory,
333 * becuse macro formal parameters don't need further lists of symbols. We lose 8 bytes per
334 * formal parameter here, but making this we can use the same code to substitute macro parameters
335 * as well as macros in the source string.
340 struct pp_symbol_
*symbols
;
345 pp_symbols_init (pp_symbols
*self
)
347 self
->symbols
= NULL
;
352 pp_symbols_free (pp_symbols
*);
354 typedef struct pp_symbol_
357 slang_string replacement
;
358 pp_symbols parameters
;
362 pp_symbol_init (pp_symbol
*self
)
364 slang_string_init (&self
->name
);
365 slang_string_init (&self
->replacement
);
366 pp_symbols_init (&self
->parameters
);
370 pp_symbol_free (pp_symbol
*self
)
372 slang_string_free (&self
->name
);
373 slang_string_free (&self
->replacement
);
374 pp_symbols_free (&self
->parameters
);
378 pp_symbol_reset (pp_symbol
*self
)
380 /* Leave symbol name intact. */
381 slang_string_reset (&self
->replacement
);
382 pp_symbols_free (&self
->parameters
);
383 pp_symbols_init (&self
->parameters
);
387 pp_symbols_free (pp_symbols
*self
)
391 for (i
= 0; i
< self
->count
; i
++)
392 pp_symbol_free (&self
->symbols
[i
]);
393 _mesa_free (self
->symbols
);
397 pp_symbols_push (pp_symbols
*self
)
399 self
->symbols
= (pp_symbol
*) (_mesa_realloc (self
->symbols
, self
->count
* sizeof (pp_symbol
),
400 (self
->count
+ 1) * sizeof (pp_symbol
)));
401 if (self
->symbols
== NULL
)
403 pp_symbol_init (&self
->symbols
[self
->count
]);
404 return &self
->symbols
[self
->count
++];
408 pp_symbols_erase (pp_symbols
*self
, pp_symbol
*symbol
)
410 assert (symbol
>= self
->symbols
&& symbol
< self
->symbols
+ self
->count
);
413 pp_symbol_free (symbol
);
414 if (symbol
< self
->symbols
+ self
->count
)
415 _mesa_memcpy (symbol
, symbol
+ 1, sizeof (pp_symbol
) * (self
->symbols
+ self
->count
- symbol
));
416 self
->symbols
= (pp_symbol
*) (_mesa_realloc (self
->symbols
, (self
->count
+ 1) * sizeof (pp_symbol
),
417 self
->count
* sizeof (pp_symbol
)));
418 return self
->symbols
!= NULL
;
422 pp_symbols_find (pp_symbols
*self
, const char *name
)
426 for (i
= 0; i
< self
->count
; i
++)
427 if (_mesa_strcmp (name
, slang_string_cstr (&self
->symbols
[i
].name
)) == 0)
428 return &self
->symbols
[i
];
433 * The condition context of a single #if/#else/#endif level. Those can be nested, so there
434 * is a stack of condition contexts.
435 * There is a special global context on the bottom of the stack. It is there to simplify
441 GLboolean current
; /* The condition value of this level. */
442 GLboolean effective
; /* The effective product of current condition, outer level conditions
443 * and position within #if-#else-#endif sections. */
444 GLboolean else_allowed
; /* TRUE if in #if-#else section, FALSE if in #else-#endif section
445 * and for global context. */
446 GLboolean endif_required
; /* FALSE for global context only. */
449 /* Should be enuff. */
450 #define CONDITION_STACK_SIZE 64
454 pp_cond_ctx stack
[CONDITION_STACK_SIZE
];
459 pp_cond_stack_push (pp_cond_stack
*self
, slang_info_log
*elog
)
461 if (self
->top
== self
->stack
) {
462 slang_info_log_error (elog
, "internal compiler error: preprocessor condition stack overflow.");
470 pp_cond_stack_reevaluate (pp_cond_stack
*self
)
472 /* There must be at least 2 conditions on the stack - one global and one being evaluated. */
473 assert (self
->top
<= &self
->stack
[CONDITION_STACK_SIZE
- 2]);
475 self
->top
->effective
= self
->top
->current
&& self
->top
[1].effective
;
479 * Extension enables through #extension directive.
480 * NOTE: Currently, only enable/disable state is stored.
485 GLboolean MESA_shader_debug
; /* GL_MESA_shader_debug enable */
486 GLboolean ARB_texture_rectangle
; /* GL_ARB_texture_rectangle enable */
490 * Disable all extensions. Called at startup and on #extension all: disable.
493 pp_ext_disable_all (pp_ext
*self
)
495 self
->MESA_shader_debug
= GL_FALSE
;
499 pp_ext_init (pp_ext
*self
)
501 pp_ext_disable_all (self
);
502 self
->ARB_texture_rectangle
= GL_TRUE
;
503 /* Other initialization code goes here. */
507 pp_ext_set (pp_ext
*self
, const char *name
, GLboolean enable
)
509 if (_mesa_strcmp (name
, "MESA_shader_debug") == 0)
510 self
->MESA_shader_debug
= enable
;
511 else if (_mesa_strcmp (name
, "GL_ARB_texture_rectangle") == 0)
512 self
->ARB_texture_rectangle
= enable
;
513 /* Next extension name tests go here. */
520 * The state of preprocessor: current line, file and version number, list of all defined macros
521 * and the #if/#endif context.
531 slang_info_log
*elog
;
536 pp_state_init (pp_state
*self
, slang_info_log
*elog
)
541 pp_symbols_init (&self
->symbols
);
542 pp_ext_init (&self
->ext
);
545 /* Initialize condition stack and create the global context. */
546 self
->cond
.top
= &self
->cond
.stack
[CONDITION_STACK_SIZE
- 1];
547 self
->cond
.top
->current
= GL_TRUE
;
548 self
->cond
.top
->effective
= GL_TRUE
;
549 self
->cond
.top
->else_allowed
= GL_FALSE
;
550 self
->cond
.top
->endif_required
= GL_FALSE
;
554 pp_state_free (pp_state
*self
)
556 pp_symbols_free (&self
->symbols
);
559 #define IS_FIRST_ID_CHAR(x) (((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') || (x) == '_')
560 #define IS_NEXT_ID_CHAR(x) (IS_FIRST_ID_CHAR(x) || ((x) >= '0' && (x) <= '9'))
561 #define IS_WHITE(x) ((x) == ' ' || (x) == '\n')
562 #define IS_NULL(x) ((x) == '\0')
564 #define SKIP_WHITE(x) do { while (IS_WHITE(*(x))) (x)++; } while (GL_FALSE)
568 slang_string
*output
;
574 expand_defined (expand_state
*e
, slang_string
*buffer
)
576 GLboolean in_paren
= GL_FALSE
;
579 /* Parse the optional opening parenthesis. */
580 SKIP_WHITE(e
->input
);
581 if (*e
->input
== '(') {
584 SKIP_WHITE(e
->input
);
588 if (!IS_FIRST_ID_CHAR(*e
->input
)) {
589 slang_info_log_error (e
->state
->elog
,
590 "preprocess error: identifier expected after operator 'defined'.");
593 slang_string_reset (buffer
);
594 slang_string_pushc (buffer
, *e
->input
++);
595 while (IS_NEXT_ID_CHAR(*e
->input
))
596 slang_string_pushc (buffer
, *e
->input
++);
597 id
= slang_string_cstr (buffer
);
599 /* Check if the operand is defined. Output 1 if it is defined, output 0 if not. */
600 if (pp_symbols_find (&e
->state
->symbols
, id
) == NULL
)
601 slang_string_pushs (e
->output
, " 0 ", 3);
603 slang_string_pushs (e
->output
, " 1 ", 3);
605 /* Parse the closing parentehesis if the opening one was there. */
607 SKIP_WHITE(e
->input
);
608 if (*e
->input
!= ')') {
609 slang_info_log_error (e
->state
->elog
, "preprocess error: ')' expected.");
613 SKIP_WHITE(e
->input
);
619 expand (expand_state
*, pp_symbols
*);
622 expand_symbol (expand_state
*e
, pp_symbol
*symbol
)
626 /* If the macro has some parameters, we need to parse them. */
627 if (symbol
->parameters
.count
!= 0) {
630 /* Parse the opening parenthesis. */
631 SKIP_WHITE(e
->input
);
632 if (*e
->input
!= '(') {
633 slang_info_log_error (e
->state
->elog
, "preprocess error: '(' expected.");
637 SKIP_WHITE(e
->input
);
639 /* Parse macro actual parameters. This can be anything, separated by a colon.
640 * TODO: What about nested/grouped parameters by parenthesis? */
641 for (i
= 0; i
< symbol
->parameters
.count
; i
++) {
642 if (*e
->input
== ')') {
643 slang_info_log_error (e
->state
->elog
, "preprocess error: unexpected ')'.");
647 /* Eat all characters up to the comma or closing parentheses. */
648 pp_symbol_reset (&symbol
->parameters
.symbols
[i
]);
649 while (!IS_NULL(*e
->input
) && *e
->input
!= ',' && *e
->input
!= ')')
650 slang_string_pushc (&symbol
->parameters
.symbols
[i
].replacement
, *e
->input
++);
652 /* If it was not the last paremeter, skip the comma. Otherwise, skip the
653 * closing parentheses. */
654 if (i
+ 1 == symbol
->parameters
.count
) {
655 /* This is the last paremeter - skip the closing parentheses. */
656 if (*e
->input
!= ')') {
657 slang_info_log_error (e
->state
->elog
, "preprocess error: ')' expected.");
661 SKIP_WHITE(e
->input
);
664 /* Skip the separating comma. */
665 if (*e
->input
!= ',') {
666 slang_info_log_error (e
->state
->elog
, "preprocess error: ',' expected.");
670 SKIP_WHITE(e
->input
);
675 /* Expand the macro. Use its parameters as a priority symbol list to expand
676 * macro parameters correctly. */
677 es
.output
= e
->output
;
678 es
.input
= slang_string_cstr (&symbol
->replacement
);
680 slang_string_pushc (e
->output
, ' ');
681 if (!expand (&es
, &symbol
->parameters
))
683 slang_string_pushc (e
->output
, ' ');
688 * Function expand() expands source text from <input> to <output>. The expansion is made using
689 * the list passed in <symbols> parameter. It allows us to expand macro formal parameters with
690 * actual parameters. The global list of symbols from pp state is used when doing a recursive
695 expand (expand_state
*e
, pp_symbols
*symbols
)
697 while (!IS_NULL(*e
->input
)) {
698 if (IS_FIRST_ID_CHAR(*e
->input
)) {
702 /* Parse the identifier. */
703 slang_string_init (&buffer
);
704 slang_string_pushc (&buffer
, *e
->input
++);
705 while (IS_NEXT_ID_CHAR(*e
->input
))
706 slang_string_pushc (&buffer
, *e
->input
++);
707 id
= slang_string_cstr (&buffer
);
709 /* Now check if the identifier is special in some way. The "defined" identifier is
710 * actually an operator that we must handle here and expand it either to " 0 " or " 1 ".
711 * The other identifiers start with "__" and we expand it to appropriate values
712 * taken from the preprocessor state. */
713 if (_mesa_strcmp (id
, "defined") == 0) {
714 if (!expand_defined (e
, &buffer
))
717 else if (_mesa_strcmp (id
, "__LINE__") == 0) {
718 slang_string_pushc (e
->output
, ' ');
719 slang_string_pushi (e
->output
, e
->state
->line
);
720 slang_string_pushc (e
->output
, ' ');
722 else if (_mesa_strcmp (id
, "__FILE__") == 0) {
723 slang_string_pushc (e
->output
, ' ');
724 slang_string_pushi (e
->output
, e
->state
->file
);
725 slang_string_pushc (e
->output
, ' ');
727 else if (_mesa_strcmp (id
, "__VERSION__") == 0) {
728 slang_string_pushc (e
->output
, ' ');
729 slang_string_pushi (e
->output
, e
->state
->version
);
730 slang_string_pushc (e
->output
, ' ');
733 else if (_mesa_strcmp (id
, "GL_ES") == 0 ||
734 _mesa_strcmp (id
, "GL_FRAGMENT_PRECISION_HIGH") == 0) {
735 slang_string_pushc (e
->output
, ' ');
736 slang_string_pushi (e
->output
, '1');
737 slang_string_pushc (e
->output
, ' ');
743 /* The list of symbols from <symbols> take precedence over the list from <state>.
744 * Note that in some cases this is the same list so avoid double look-up. */
745 symbol
= pp_symbols_find (symbols
, id
);
746 if (symbol
== NULL
&& symbols
!= &e
->state
->symbols
)
747 symbol
= pp_symbols_find (&e
->state
->symbols
, id
);
749 /* If the symbol was found, recursively expand its definition. */
750 if (symbol
!= NULL
) {
751 if (!expand_symbol (e
, symbol
)) {
752 slang_string_free (&buffer
);
757 slang_string_push (e
->output
, &buffer
);
760 slang_string_free (&buffer
);
762 else if (IS_WHITE(*e
->input
)) {
763 slang_string_pushc (e
->output
, *e
->input
++);
766 while (!IS_WHITE(*e
->input
) && !IS_NULL(*e
->input
) && !IS_FIRST_ID_CHAR(*e
->input
))
767 slang_string_pushc (e
->output
, *e
->input
++);
774 parse_if (slang_string
*output
, const byte
*prod
, GLuint
*pi
, GLint
*result
, pp_state
*state
,
780 text
= (const char *) (&prod
[*pi
]);
781 len
= _mesa_strlen (text
);
783 if (state
->cond
.top
->effective
) {
789 /* Expand the expression. */
790 slang_string_init (&expr
);
794 if (!expand (&es
, &state
->symbols
))
797 /* Execute the expression. */
798 count
= execute_expressions (output
, eid
, (const byte
*) (slang_string_cstr (&expr
)),
799 results
, state
->elog
);
800 slang_string_free (&expr
);
803 *result
= results
[0];
806 /* The directive is dead. */
814 #define ESCAPE_TOKEN 0
817 #define TOKEN_DEFINE 1
818 #define TOKEN_UNDEF 2
822 #define TOKEN_ENDIF 6
823 #define TOKEN_ERROR 7
824 #define TOKEN_PRAGMA 8
825 #define TOKEN_EXTENSION 9
826 #define TOKEN_LINE 10
829 #define PARAM_PARAMETER 1
831 #define BEHAVIOR_REQUIRE 1
832 #define BEHAVIOR_ENABLE 2
833 #define BEHAVIOR_WARN 3
834 #define BEHAVIOR_DISABLE 4
837 preprocess_source (slang_string
*output
, const char *source
, grammar pid
, grammar eid
,
838 slang_info_log
*elog
)
840 static const char *predefined
[] = {
846 "GL_FRAGMENT_PRECISION_HIGH",
854 if (!grammar_fast_check (pid
, (const byte
*) (source
), &prod
, &size
, 65536)) {
855 grammar_error_to_log (elog
);
859 pp_state_init (&state
, elog
);
861 /* add the predefined symbols to the symbol table */
862 for (i
= 0; predefined
[i
]; i
++) {
863 pp_symbol
*symbol
= NULL
;
864 symbol
= pp_symbols_push(&state
.symbols
);
866 slang_string_pushs(&symbol
->name
,
867 predefined
[i
], _mesa_strlen(predefined
[i
]));
872 if (prod
[i
] != ESCAPE_TOKEN
) {
873 if (state
.cond
.top
->effective
) {
877 /* Eat only one line of source code to expand it.
878 * FIXME: This approach has one drawback. If a macro with parameters spans across
879 * multiple lines, the preprocessor will raise an error. */
880 slang_string_init (&input
);
881 while (prod
[i
] != '\0' && prod
[i
] != '\n')
882 slang_string_pushc (&input
, prod
[i
++]);
884 slang_string_pushc (&input
, prod
[i
++]);
886 /* Increment line number. */
890 es
.input
= slang_string_cstr (&input
);
892 if (!expand (&es
, &state
.symbols
))
895 slang_string_free (&input
);
898 /* Condition stack is disabled - keep track on line numbers and output only newlines. */
899 if (prod
[i
] == '\n') {
901 /*pp_annotate (output, "%c", prod[i]);*/
904 /*pp_annotate (output, "%c", prod[i]);*/
917 /* End of source string.
918 * Check if all #ifs have been terminated by matching #endifs.
919 * On condition stack there should be only the global condition context. */
920 if (state
.cond
.top
->endif_required
) {
921 slang_info_log_error (elog
, "end of source without matching #endif.");
928 pp_symbol
*symbol
= NULL
;
930 /* Parse macro name. */
931 id
= (const char *) (&prod
[i
]);
932 idlen
= _mesa_strlen (id
);
933 if (state
.cond
.top
->effective
) {
934 pp_annotate (output
, "// #define %s(", id
);
936 /* If the symbol is already defined, override it. */
937 symbol
= pp_symbols_find (&state
.symbols
, id
);
938 if (symbol
== NULL
) {
939 symbol
= pp_symbols_push (&state
.symbols
);
942 slang_string_pushs (&symbol
->name
, id
, idlen
);
945 pp_symbol_reset (symbol
);
950 /* Parse optional macro parameters. */
951 while (prod
[i
++] != PARAM_END
) {
952 if (state
.cond
.top
->effective
) {
955 id
= (const char *) (&prod
[i
]);
956 idlen
= _mesa_strlen (id
);
957 pp_annotate (output
, "%s, ", id
);
958 param
= pp_symbols_push (&symbol
->parameters
);
961 slang_string_pushs (¶m
->name
, id
, idlen
);
966 /* Parse macro replacement. */
967 id
= (const char *) (&prod
[i
]);
968 idlen
= _mesa_strlen (id
);
969 if (state
.cond
.top
->effective
) {
970 pp_annotate (output
, ") %s", id
);
971 slang_string_pushs (&symbol
->replacement
, id
, idlen
);
978 id
= (const char *) (&prod
[i
]);
979 i
+= _mesa_strlen (id
) + 1;
980 if (state
.cond
.top
->effective
) {
983 pp_annotate (output
, "// #undef %s", id
);
984 /* Try to find symbol with given name and remove it. */
985 symbol
= pp_symbols_find (&state
.symbols
, id
);
987 if (!pp_symbols_erase (&state
.symbols
, symbol
))
996 /* Parse #if expression end execute it. */
997 pp_annotate (output
, "// #if ");
998 if (!parse_if (output
, prod
, &i
, &result
, &state
, eid
))
1001 /* Push new condition on the stack. */
1002 if (!pp_cond_stack_push (&state
.cond
, state
.elog
))
1004 state
.cond
.top
->current
= result
? GL_TRUE
: GL_FALSE
;
1005 state
.cond
.top
->else_allowed
= GL_TRUE
;
1006 state
.cond
.top
->endif_required
= GL_TRUE
;
1007 pp_cond_stack_reevaluate (&state
.cond
);
1012 /* Check if #else is alloved here. */
1013 if (!state
.cond
.top
->else_allowed
) {
1014 slang_info_log_error (elog
, "#else without matching #if.");
1018 /* Negate current condition and reevaluate it. */
1019 state
.cond
.top
->current
= !state
.cond
.top
->current
;
1020 state
.cond
.top
->else_allowed
= GL_FALSE
;
1021 pp_cond_stack_reevaluate (&state
.cond
);
1022 if (state
.cond
.top
->effective
)
1023 pp_annotate (output
, "// #else");
1027 /* Check if #elif is alloved here. */
1028 if (!state
.cond
.top
->else_allowed
) {
1029 slang_info_log_error (elog
, "#elif without matching #if.");
1033 /* Negate current condition and reevaluate it. */
1034 state
.cond
.top
->current
= !state
.cond
.top
->current
;
1035 pp_cond_stack_reevaluate (&state
.cond
);
1037 if (state
.cond
.top
->effective
)
1038 pp_annotate (output
, "// #elif ");
1043 /* Parse #elif expression end execute it. */
1044 if (!parse_if (output
, prod
, &i
, &result
, &state
, eid
))
1047 /* Update current condition and reevaluate it. */
1048 state
.cond
.top
->current
= result
? GL_TRUE
: GL_FALSE
;
1049 pp_cond_stack_reevaluate (&state
.cond
);
1054 /* Check if #endif is alloved here. */
1055 if (!state
.cond
.top
->endif_required
) {
1056 slang_info_log_error (elog
, "#endif without matching #if.");
1060 /* Pop the condition off the stack. */
1062 if (state
.cond
.top
->effective
)
1063 pp_annotate (output
, "// #endif");
1066 case TOKEN_EXTENSION
:
1067 /* Parse the extension name. */
1068 id
= (const char *) (&prod
[i
]);
1069 i
+= _mesa_strlen (id
) + 1;
1070 if (state
.cond
.top
->effective
)
1071 pp_annotate (output
, "// #extension %s: ", id
);
1073 /* Parse and apply extension behavior. */
1074 if (state
.cond
.top
->effective
) {
1075 switch (prod
[i
++]) {
1077 case BEHAVIOR_REQUIRE
:
1078 pp_annotate (output
, "require");
1079 if (!pp_ext_set (&state
.ext
, id
, GL_TRUE
)) {
1080 if (_mesa_strcmp (id
, "all") == 0) {
1081 slang_info_log_error (elog
, "require: bad behavior for #extension all.");
1085 slang_info_log_error (elog
, "%s: required extension is not supported.", id
);
1091 case BEHAVIOR_ENABLE
:
1092 pp_annotate (output
, "enable");
1093 if (!pp_ext_set (&state
.ext
, id
, GL_TRUE
)) {
1094 if (_mesa_strcmp (id
, "all") == 0) {
1095 slang_info_log_error (elog
, "enable: bad behavior for #extension all.");
1099 slang_info_log_warning (elog
, "%s: enabled extension is not supported.", id
);
1105 pp_annotate (output
, "warn");
1106 if (!pp_ext_set (&state
.ext
, id
, GL_TRUE
)) {
1107 if (_mesa_strcmp (id
, "all") != 0) {
1108 slang_info_log_warning (elog
, "%s: enabled extension is not supported.", id
);
1113 case BEHAVIOR_DISABLE
:
1114 pp_annotate (output
, "disable");
1115 if (!pp_ext_set (&state
.ext
, id
, GL_FALSE
)) {
1116 if (_mesa_strcmp (id
, "all") == 0) {
1117 pp_ext_disable_all (&state
.ext
);
1120 slang_info_log_warning (elog
, "%s: disabled extension is not supported.", id
);
1132 id
= (const char *) (&prod
[i
]);
1133 i
+= _mesa_strlen (id
) + 1;
1135 if (state
.cond
.top
->effective
) {
1136 slang_string buffer
;
1141 slang_string_init (&buffer
);
1143 es
.output
= &buffer
;
1146 if (!expand (&es
, &state
.symbols
))
1149 pp_annotate (output
, "// #line ");
1150 count
= execute_expressions (output
, eid
,
1151 (const byte
*) (slang_string_cstr (&buffer
)),
1152 results
, state
.elog
);
1153 slang_string_free (&buffer
);
1157 state
.line
= results
[0] - 1;
1159 state
.file
= results
[1];
1166 /* Check for missing #endifs. */
1167 if (state
.cond
.top
->endif_required
) {
1168 slang_info_log_error (elog
, "#endif expected but end of source found.");
1172 grammar_alloc_free(prod
);
1173 pp_state_free (&state
);
1177 grammar_alloc_free(prod
);
1178 pp_state_free (&state
);
1183 _slang_preprocess_directives (slang_string
*output
, const char *input
, slang_info_log
*elog
)
1188 pid
= grammar_load_from_text ((const byte
*) (slang_pp_directives_syn
));
1190 grammar_error_to_log (elog
);
1193 eid
= grammar_load_from_text ((const byte
*) (slang_pp_expression_syn
));
1195 grammar_error_to_log (elog
);
1196 grammar_destroy (pid
);
1199 success
= preprocess_source (output
, input
, pid
, eid
, elog
);
1200 grammar_destroy (eid
);
1201 grammar_destroy (pid
);