/
mojoshader_preprocessor.c
2482 lines (2091 loc) · 69.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
/**
* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
13
14
15
16
17
18
#if DEBUG_PREPROCESSOR
#define print_debug_token(token, len, val) \
MOJOSHADER_print_debug_token("PREPROCESSOR", token, len, val)
#else
#define print_debug_token(token, len, val)
#endif
19
20
#if DEBUG_LEXER
21
static Token debug_preprocessor_lexer(IncludeState *s)
22
{
23
const Token retval = preprocessor_lexer(s);
24
MOJOSHADER_print_debug_token("LEXER", s->token, s->tokenlen, retval);
25
return retval;
26
27
} // debug_preprocessor_lexer
#define preprocessor_lexer(s) debug_preprocessor_lexer(s)
28
29
#endif
30
31
32
#if DEBUG_TOKENIZER
static void print_debug_lexing_position(IncludeState *s)
{
33
34
if (s != NULL)
printf("NOW LEXING %s:%d ...\n", s->filename, s->line);
35
36
37
38
39
} // print_debug_lexing_position
#else
#define print_debug_lexing_position(s)
#endif
40
41
42
43
typedef struct Context
{
int isfail;
int out_of_memory;
44
char failstr[256];
45
int recursion_count;
46
int asm_comments;
47
int parsing_pragma;
48
Conditional *conditional_pool;
49
IncludeState *include_stack;
50
IncludeState *include_pool;
51
52
Define *define_hashtable[256];
Define *define_pool;
53
54
Define *file_macro;
Define *line_macro;
55
StringCache *filename_cache;
56
57
58
59
60
61
62
63
64
65
66
67
MOJOSHADER_includeOpen open_callback;
MOJOSHADER_includeClose close_callback;
MOJOSHADER_malloc malloc;
MOJOSHADER_free free;
void *malloc_data;
} Context;
// Convenience functions for allocators...
static inline void out_of_memory(Context *ctx)
{
68
ctx->out_of_memory = 1;
69
70
71
72
73
74
75
76
77
78
79
80
} // out_of_memory
static inline void *Malloc(Context *ctx, const size_t len)
{
void *retval = ctx->malloc((int) len, ctx->malloc_data);
if (retval == NULL)
out_of_memory(ctx);
return retval;
} // Malloc
static inline void Free(Context *ctx, void *ptr)
{
81
ctx->free(ptr, ctx->malloc_data);
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
} // Free
static inline char *StrDup(Context *ctx, const char *str)
{
char *retval = (char *) Malloc(ctx, strlen(str) + 1);
if (retval != NULL)
strcpy(retval, str);
return retval;
} // StrDup
static void failf(Context *ctx, const char *fmt, ...) ISPRINTF(2,3);
static void failf(Context *ctx, const char *fmt, ...)
{
ctx->isfail = 1;
va_list ap;
va_start(ap, fmt);
98
vsnprintf(ctx->failstr, sizeof (ctx->failstr), fmt, ap);
99
100
101
102
103
104
105
106
107
va_end(ap);
} // failf
static inline void fail(Context *ctx, const char *reason)
{
failf(ctx, "%s", reason);
} // fail
108
109
110
111
112
113
114
115
116
117
118
#if DEBUG_TOKENIZER
void MOJOSHADER_print_debug_token(const char *subsystem, const char *token,
const unsigned int tokenlen,
const Token tokenval)
{
printf("%s TOKEN: \"", subsystem);
unsigned int i;
for (i = 0; i < tokenlen; i++)
{
if (token[i] == '\n')
printf("\\n");
119
120
else if (token[i] == '\\')
printf("\\\\");
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
else
printf("%c", token[i]);
} // for
printf("\" (");
switch (tokenval)
{
#define TOKENCASE(x) case x: printf("%s", #x); break
TOKENCASE(TOKEN_UNKNOWN);
TOKENCASE(TOKEN_IDENTIFIER);
TOKENCASE(TOKEN_INT_LITERAL);
TOKENCASE(TOKEN_FLOAT_LITERAL);
TOKENCASE(TOKEN_STRING_LITERAL);
TOKENCASE(TOKEN_ADDASSIGN);
TOKENCASE(TOKEN_SUBASSIGN);
TOKENCASE(TOKEN_MULTASSIGN);
TOKENCASE(TOKEN_DIVASSIGN);
TOKENCASE(TOKEN_MODASSIGN);
TOKENCASE(TOKEN_XORASSIGN);
TOKENCASE(TOKEN_ANDASSIGN);
TOKENCASE(TOKEN_ORASSIGN);
TOKENCASE(TOKEN_INCREMENT);
TOKENCASE(TOKEN_DECREMENT);
TOKENCASE(TOKEN_RSHIFT);
TOKENCASE(TOKEN_LSHIFT);
TOKENCASE(TOKEN_ANDAND);
TOKENCASE(TOKEN_OROR);
TOKENCASE(TOKEN_LEQ);
TOKENCASE(TOKEN_GEQ);
TOKENCASE(TOKEN_EQL);
TOKENCASE(TOKEN_NEQ);
151
TOKENCASE(TOKEN_HASH);
152
153
154
155
156
157
158
159
160
161
162
163
TOKENCASE(TOKEN_HASHHASH);
TOKENCASE(TOKEN_PP_INCLUDE);
TOKENCASE(TOKEN_PP_LINE);
TOKENCASE(TOKEN_PP_DEFINE);
TOKENCASE(TOKEN_PP_UNDEF);
TOKENCASE(TOKEN_PP_IF);
TOKENCASE(TOKEN_PP_IFDEF);
TOKENCASE(TOKEN_PP_IFNDEF);
TOKENCASE(TOKEN_PP_ELSE);
TOKENCASE(TOKEN_PP_ELIF);
TOKENCASE(TOKEN_PP_ENDIF);
TOKENCASE(TOKEN_PP_ERROR);
164
TOKENCASE(TOKEN_PP_PRAGMA);
165
166
TOKENCASE(TOKEN_INCOMPLETE_COMMENT);
TOKENCASE(TOKEN_BAD_CHARS);
167
TOKENCASE(TOKEN_EOI);
168
TOKENCASE(TOKEN_PREPROCESSING_ERROR);
169
170
171
172
173
174
#undef TOKENCASE
case ((Token) '\n'):
printf("'\\n'");
break;
175
176
177
178
case ((Token) '\\'):
printf("'\\\\'");
break;
179
180
181
182
183
184
185
186
187
188
default:
assert(((int)tokenval) < 256);
printf("'%c'", (char) tokenval);
break;
} // switch
printf(")\n");
} // MOJOSHADER_print_debug_token
#endif
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
#if !MOJOSHADER_FORCE_INCLUDE_CALLBACKS
// !!! FIXME: most of these _MSC_VER should probably be _WINDOWS?
#ifdef _MSC_VER
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h> // GL headers need this for WINGDIAPI definition.
#else
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#endif
int MOJOSHADER_internal_include_open(MOJOSHADER_includeType inctype,
const char *fname, const char *parent,
const char **outdata,
unsigned int *outbytes,
MOJOSHADER_malloc m, MOJOSHADER_free f,
void *d)
{
#ifdef _MSC_VER
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
WCHAR wpath[MAX_PATH];
if (!MultiByteToWideChar(CP_UTF8, 0, fname, -1, wpath, MAX_PATH))
return 0;
const DWORD share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
const HANDLE handle = CreateFileW(wpath, FILE_GENERIC_READ, share,
NULL, OPEN_EXISTING, NULL, NULL);
if (handle == INVALID_HANDLE_VALUE)
return 0;
const DWORD fileSize = GetFileSize(handle, NULL);
if (fileSize == INVALID_FILE_SIZE)
{
CloseHandle(handle);
return 0;
} // if
char *data = (char *) m(fileSize, d);
if (data == NULL)
{
CloseHandle(handle);
return 0;
} // if
DWORD readLength = 0;
if (!ReadFile(handle, data, fileSize, &readLength, NULL))
{
CloseHandle(handle);
f(data, d);
return 0;
} // if
CloseHandle(handle);
if (readLength != fileSize)
{
f(data, d);
return 0;
} // if
*outdata = data;
*outbytes = fileSize;
return 1;
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
#else
struct stat statbuf;
if (stat(fname, &statbuf) == -1)
return 0;
char *data = (char *) m(statbuf.st_size, d);
if (data == NULL)
return 0;
const int fd = open(fname, O_RDONLY);
if (fd == -1)
{
f(data, d);
return 0;
} // if
if (read(fd, data, statbuf.st_size) != statbuf.st_size)
{
f(data, d);
close(fd);
return 0;
} // if
close(fd);
*outdata = data;
*outbytes = (unsigned int) statbuf.st_size;
return 1;
#endif
} // MOJOSHADER_internal_include_open
void MOJOSHADER_internal_include_close(const char *data, MOJOSHADER_malloc m,
MOJOSHADER_free f, void *d)
{
f((void *) data, d);
} // MOJOSHADER_internal_include_close
#endif // !MOJOSHADER_FORCE_INCLUDE_CALLBACKS
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
// data buffer stuff...
#define BUFFER_LEN (64 * 1024)
typedef struct BufferList
{
char buffer[BUFFER_LEN];
size_t bytes;
struct BufferList *next;
} BufferList;
typedef struct Buffer
{
size_t total_bytes;
BufferList head;
BufferList *tail;
} Buffer;
304
static void init_buffer(Buffer *buffer)
305
306
307
308
309
{
buffer->total_bytes = 0;
buffer->head.bytes = 0;
buffer->head.next = NULL;
buffer->tail = &buffer->head;
310
} // init_buffer
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
static int add_to_buffer(Buffer *buffer, const char *data,
size_t len, MOJOSHADER_malloc m, void *d)
{
buffer->total_bytes += len;
while (len > 0)
{
const size_t avail = BUFFER_LEN - buffer->tail->bytes;
const size_t cpy = (avail > len) ? len : avail;
memcpy(buffer->tail->buffer + buffer->tail->bytes, data, cpy);
len -= cpy;
data += cpy;
buffer->tail->bytes += cpy;
assert(buffer->tail->bytes <= BUFFER_LEN);
if (buffer->tail->bytes == BUFFER_LEN)
{
BufferList *item = (BufferList *) m(sizeof (BufferList), d);
if (item == NULL)
return 0;
item->bytes = 0;
item->next = NULL;
buffer->tail->next = item;
buffer->tail = item;
} // if
} // while
return 1;
} // add_to_buffer
static char *flatten_buffer(Buffer *buffer, MOJOSHADER_malloc m, void *d)
{
344
char *retval = (char *) m(buffer->total_bytes + 1, d);
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
if (retval == NULL)
return NULL;
BufferList *item = &buffer->head;
char *ptr = retval;
while (item != NULL)
{
BufferList *next = item->next;
memcpy(ptr, item->buffer, item->bytes);
ptr += item->bytes;
item = next;
} // while
*ptr = '\0';
assert(ptr == (retval + buffer->total_bytes));
return retval;
} // flatten_buffer
static void free_buffer(Buffer *buffer, MOJOSHADER_free f, void *d)
{
// head is statically allocated, so start with head.next...
BufferList *item = buffer->head.next;
while (item != NULL)
{
BufferList *next = item->next;
f(item, d);
item = next;
} // while
373
init_buffer(buffer);
374
375
376
} // free_buffer
377
// !!! FIXME: maybe use these pool magic elsewhere?
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
// Pool stuff...
// ugh, I hate this macro salsa.
#define FREE_POOL(type, poolname) \
static void free_##poolname##_pool(Context *ctx) { \
type *item = ctx->poolname##_pool; \
while (item != NULL) { \
type *next = item->next; \
Free(ctx, item); \
item = next; \
} \
}
#define GET_POOL(type, poolname) \
static type *get_##poolname(Context *ctx) { \
type *retval = ctx->poolname##_pool; \
if (retval != NULL) \
ctx->poolname##_pool = retval->next; \
else \
retval = (type *) Malloc(ctx, sizeof (type)); \
if (retval != NULL) \
memset(retval, '\0', sizeof (type)); \
return retval; \
}
#define PUT_POOL(type, poolname) \
static void put_##poolname(Context *ctx, type *item) { \
item->next = ctx->poolname##_pool; \
406
ctx->poolname##_pool = item; \
407
408
409
410
411
412
413
414
415
}
#define IMPLEMENT_POOL(type, poolname) \
FREE_POOL(type, poolname) \
GET_POOL(type, poolname) \
PUT_POOL(type, poolname)
IMPLEMENT_POOL(Conditional, conditional)
IMPLEMENT_POOL(IncludeState, include)
416
IMPLEMENT_POOL(Define, define)
417
418
419
420
// Preprocessor define hashtable stuff...
421
422
// !!! FIXME: why isn't this using mojoshader_common.c's code?
423
424
// this is djb's xor hashing function.
static inline uint32 hash_string_djbxor(const char *sym)
425
{
426
register uint32 hash = 5381;
427
while (*sym)
428
429
430
431
432
433
434
hash = ((hash << 5) + hash) ^ *(sym++);
return hash;
} // hash_string_djbxor
static inline uint8 hash_define(const char *sym)
{
return (uint8) hash_string_djbxor(sym);
435
436
437
} // hash_define
438
static int add_define(Context *ctx, const char *sym, const char *val,
439
char **parameters, int paramcount)
440
{
441
const uint8 hash = hash_define(sym);
442
Define *bucket = ctx->define_hashtable[hash];
443
444
while (bucket)
{
445
if (strcmp(bucket->identifier, sym) == 0)
446
{
447
448
failf(ctx, "'%s' already defined", sym); // !!! FIXME: warning?
// !!! FIXME: gcc reports the location of previous #define here.
449
450
451
452
453
return 0;
} // if
bucket = bucket->next;
} // while
454
bucket = get_define(ctx);
455
456
457
if (bucket == NULL)
return 0;
458
bucket->definition = val;
459
bucket->original = NULL;
460
461
462
bucket->identifier = sym;
bucket->parameters = (const char **) parameters;
bucket->paramcount = paramcount;
463
464
465
466
467
468
bucket->next = ctx->define_hashtable[hash];
ctx->define_hashtable[hash] = bucket;
return 1;
} // add_define
469
470
static void free_define(Context *ctx, Define *def)
{
471
472
473
474
475
476
477
478
479
480
481
if (def != NULL)
{
int i;
for (i = 0; i < def->paramcount; i++)
Free(ctx, (void *) def->parameters[i]);
Free(ctx, (void *) def->parameters);
Free(ctx, (void *) def->identifier);
Free(ctx, (void *) def->definition);
Free(ctx, (void *) def->original);
put_define(ctx, def);
} // if
482
483
484
} // free_define
485
486
static int remove_define(Context *ctx, const char *sym)
{
487
const uint8 hash = hash_define(sym);
488
489
Define *bucket = ctx->define_hashtable[hash];
Define *prev = NULL;
490
491
while (bucket)
{
492
if (strcmp(bucket->identifier, sym) == 0)
493
494
495
496
497
{
if (prev == NULL)
ctx->define_hashtable[hash] = bucket->next;
else
prev->next = bucket->next;
498
free_define(ctx, bucket);
499
500
501
502
503
504
505
506
507
508
return 1;
} // if
prev = bucket;
bucket = bucket->next;
} // while
return 0;
} // remove_define
509
static const Define *find_define(Context *ctx, const char *sym)
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
if ( (ctx->file_macro) && (strcmp(sym, "__FILE__") == 0) )
{
Free(ctx, (char *) ctx->file_macro->definition);
const IncludeState *state = ctx->include_stack;
const char *fname = state ? state->filename : "";
const size_t len = strlen(fname) + 2;
char *str = (char *) Malloc(ctx, len);
if (!str)
return NULL;
str[0] = '\"';
memcpy(str + 1, fname, len - 2);
str[len - 1] = '\"';
ctx->file_macro->definition = str;
return ctx->file_macro;
} // if
else if ( (ctx->line_macro) && (strcmp(sym, "__LINE__") == 0) )
{
Free(ctx, (char *) ctx->line_macro->definition);
const IncludeState *state = ctx->include_stack;
const size_t bufsize = 32;
char *str = (char *) Malloc(ctx, bufsize);
if (!str)
return 0;
const size_t len = snprintf(str, bufsize, "%u", state->line);
assert(len < bufsize);
ctx->line_macro->definition = str;
return ctx->line_macro;
} // else
542
const uint8 hash = hash_define(sym);
543
Define *bucket = ctx->define_hashtable[hash];
544
545
while (bucket)
{
546
if (strcmp(bucket->identifier, sym) == 0)
547
return bucket;
548
549
550
551
552
553
bucket = bucket->next;
} // while
return NULL;
} // find_define
554
555
556
557
558
559
560
561
562
563
564
static const Define *find_define_by_token(Context *ctx)
{
IncludeState *state = ctx->include_stack;
assert(state->tokenval == TOKEN_IDENTIFIER);
char *sym = (char *) alloca(state->tokenlen+1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
return find_define(ctx, sym);
} // find_define_by_token
565
566
static const Define *find_macro_arg(const IncludeState *state,
const Define *defines)
567
568
569
570
571
572
{
const Define *def = NULL;
char *sym = (char *) alloca(state->tokenlen + 1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
573
for (def = defines; def != NULL; def = def->next)
574
{
575
assert(def->parameters == NULL); // args can't have args!
576
577
578
579
580
581
582
583
584
assert(def->paramcount == 0); // args can't have args!
if (strcmp(def->identifier, sym) == 0)
break;
} // while
return def;
} // find_macro_arg
585
static void put_all_defines(Context *ctx)
586
{
587
size_t i;
588
589
for (i = 0; i < STATICARRAYLEN(ctx->define_hashtable); i++)
{
590
Define *bucket = ctx->define_hashtable[i];
591
592
593
ctx->define_hashtable[i] = NULL;
while (bucket)
{
594
Define *next = bucket->next;
595
free_define(ctx, bucket);
596
597
598
bucket = next;
} // while
} // for
599
} // put_all_defines
600
601
602
static int push_source(Context *ctx, const char *fname, const char *source,
603
unsigned int srclen, unsigned int linenum,
604
MOJOSHADER_includeClose close_callback)
605
{
606
IncludeState *state = get_include(ctx);
607
608
609
if (state == NULL)
return 0;
610
if (fname != NULL)
611
{
612
state->filename = stringcache(ctx->filename_cache, fname);
613
614
if (state->filename == NULL)
{
615
out_of_memory(ctx);
616
put_include(ctx, state);
617
618
return 0;
} // if
619
620
} // if
621
state->close_callback = close_callback;
622
623
624
state->source_base = source;
state->source = source;
state->token = source;
625
state->tokenval = ((Token) '\n');
626
state->orig_length = srclen;
627
state->bytes_left = srclen;
628
state->line = linenum;
629
state->next = ctx->include_stack;
630
state->asm_comments = ctx->asm_comments;
631
632
633
print_debug_lexing_position(state);
634
635
636
637
638
639
640
641
642
ctx->include_stack = state;
return 1;
} // push_source
static void pop_source(Context *ctx)
{
IncludeState *state = ctx->include_stack;
643
assert(state != NULL); // more pops than pushes!
644
645
646
if (state == NULL)
return;
647
if (state->close_callback)
648
{
649
650
state->close_callback(state->source_base, ctx->malloc,
ctx->free, ctx->malloc_data);
651
652
} // if
653
654
// state->filename is a pointer to the filename cache; don't free it here!
655
656
657
658
659
660
661
Conditional *cond = state->conditional_stack;
while (cond)
{
Conditional *next = cond->next;
put_conditional(ctx, cond);
cond = next;
} // while
662
663
ctx->include_stack = state->next;
664
665
666
print_debug_lexing_position(ctx->include_stack);
667
put_include(ctx, state);
668
669
670
} // pop_source
671
672
673
674
675
676
677
static void close_define_include(const char *data, MOJOSHADER_malloc m,
MOJOSHADER_free f, void *d)
{
f((void *) data, d);
} // close_define_include
678
679
680
681
Preprocessor *preprocessor_start(const char *fname, const char *source,
unsigned int sourcelen,
MOJOSHADER_includeOpen open_callback,
MOJOSHADER_includeClose close_callback,
682
const MOJOSHADER_preprocessorDefine *defines,
683
unsigned int define_count, int asm_comments,
684
685
686
MOJOSHADER_malloc m, MOJOSHADER_free f, void *d)
{
int okay = 1;
687
unsigned int i = 0;
688
689
690
691
692
693
694
// the preprocessor is internal-only, so we verify all these are != NULL.
assert(m != NULL);
assert(f != NULL);
Context *ctx = (Context *) m(sizeof (Context), d);
if (ctx == NULL)
695
return NULL;
696
697
698
699
700
701
702
memset(ctx, '\0', sizeof (Context));
ctx->malloc = m;
ctx->free = f;
ctx->malloc_data = d;
ctx->open_callback = open_callback;
ctx->close_callback = close_callback;
703
ctx->asm_comments = asm_comments;
704
705
ctx->filename_cache = stringcache_create(m, f, d);
706
707
708
709
710
711
712
713
714
715
716
okay = ((okay) && (ctx->filename_cache != NULL));
ctx->file_macro = get_define(ctx);
okay = ((okay) && (ctx->file_macro != NULL));
if ((okay) && (ctx->file_macro))
okay = ((ctx->file_macro->identifier = StrDup(ctx, "__FILE__")) != 0);
ctx->line_macro = get_define(ctx);
okay = ((okay) && (ctx->line_macro != NULL));
if ((okay) && (ctx->line_macro))
okay = ((ctx->line_macro->identifier = StrDup(ctx, "__LINE__")) != 0);
717
718
719
720
// let the usual preprocessor parser sort these out.
char *define_include = NULL;
unsigned int define_include_len = 0;
721
if ((okay) && (define_count > 0))
722
{
723
for (i = 0; i < define_count; i++)
724
{
725
726
define_include_len += strlen(defines[i].identifier);
define_include_len += strlen(defines[i].definition);
727
728
729
730
731
732
define_include_len += 10; // "#define<space><space><newline>"
} // for
define_include_len++; // for null terminator.
define_include = (char *) Malloc(ctx, define_include_len);
if (define_include == NULL)
733
okay = 0;
734
735
736
737
738
else
{
char *ptr = define_include;
for (i = 0; i < define_count; i++)
{
739
740
ptr += sprintf(ptr, "#define %s %s\n", defines[i].identifier,
defines[i].definition);
741
742
743
} // for
} // else
} // if
744
745
if ((okay) && (!push_source(ctx,fname,source,sourcelen,1,NULL)))
746
747
okay = 0;
748
749
750
if ((okay) && (define_include != NULL))
{
okay = push_source(ctx, "<predefined macros>", define_include,
751
define_include_len, 1, close_define_include);
752
753
} // if
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
if (!okay)
{
preprocessor_end((Preprocessor *) ctx);
return NULL;
} // if
return (Preprocessor *) ctx;
} // preprocessor_start
void preprocessor_end(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
if (ctx == NULL)
return;
while (ctx->include_stack != NULL)
pop_source(ctx);
773
774
put_all_defines(ctx);
775
776
777
if (ctx->filename_cache != NULL)
stringcache_destroy(ctx->filename_cache);
778
779
free_define(ctx, ctx->file_macro);
free_define(ctx, ctx->line_macro);
780
free_define_pool(ctx);
781
free_conditional_pool(ctx);
782
free_include_pool(ctx);
783
784
785
786
787
788
789
790
791
792
793
794
Free(ctx, ctx);
} // preprocessor_end
int preprocessor_outofmemory(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
return ctx->out_of_memory;
} // preprocessor_outofmemory
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
static inline void pushback(IncludeState *state)
{
#if DEBUG_PREPROCESSOR
printf("PREPROCESSOR PUSHBACK\n");
#endif
assert(!state->pushedback);
state->pushedback = 1;
} // pushback
static Token lexer(IncludeState *state)
{
if (!state->pushedback)
return preprocessor_lexer(state);
state->pushedback = 0;
return state->tokenval;
} // lexer
814
// !!! FIXME: parsing fails on preprocessor directives should skip rest of line.
815
816
static int require_newline(IncludeState *state)
{
817
818
const Token token = lexer(state);
pushback(state); // rewind no matter what.
819
return ( (token == TOKEN_INCOMPLETE_COMMENT) || // call it an eol.
820
(token == ((Token) '\n')) || (token == TOKEN_EOI) );
821
822
823
} // require_newline
824
825
826
827
828
829
830
831
832
833
static int token_to_int(IncludeState *state)
{
assert(state->tokenval == TOKEN_INT_LITERAL);
char *buf = (char *) alloca(state->tokenlen+1);
memcpy(buf, state->token, state->tokenlen);
buf[state->tokenlen] = '\0';
return atoi(buf);
} // token_to_int
834
835
836
static void handle_pp_include(Context *ctx)
{
IncludeState *state = ctx->include_stack;
837
Token token = lexer(state);
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
MOJOSHADER_includeType incltype;
char *filename = NULL;
int bogus = 0;
if (token == TOKEN_STRING_LITERAL)
incltype = MOJOSHADER_INCLUDETYPE_LOCAL;
else if (token == ((Token) '<'))
{
incltype = MOJOSHADER_INCLUDETYPE_SYSTEM;
// can't use lexer, since every byte between the < > pair is
// considered part of the filename. :/
while (!bogus)
{
if ( !(bogus = (state->bytes_left == 0)) )
{
const char ch = *state->source;
if ( !(bogus = ((ch == '\r') || (ch == '\n'))) )
{
state->source++;
state->bytes_left--;
if (ch == '>')
break;
} // if
} // if
} // while
} // else if
else
{
bogus = 1;
} // else
if (!bogus)
{
state->token++; // skip '<' or '\"'...
const unsigned int len = ((unsigned int) (state->source-state->token));
filename = (char *) alloca(len);
memcpy(filename, state->token, len-1);
filename[len-1] = '\0';
877
bogus = !require_newline(state);
878
879
880
881
882
883
884
885
886
887
} // if
if (bogus)
{
fail(ctx, "Invalid #include directive");
return;
} // else
const char *newdata = NULL;
unsigned int newbytes = 0;
888
889
890
891
892
893
if ((ctx->open_callback == NULL) || (ctx->close_callback == NULL))
{
fail(ctx, "Saw #include, but no include callbacks defined");
return;
} // if
894
895
896
897
898
899
900
901
if (!ctx->open_callback(incltype, filename, state->source_base,
&newdata, &newbytes, ctx->malloc,
ctx->free, ctx->malloc_data))
{
fail(ctx, "Include callback failed"); // !!! FIXME: better error
return;
} // if
902
MOJOSHADER_includeClose callback = ctx->close_callback;
903
if (!push_source(ctx, filename, newdata, newbytes, 1, callback))
904
905
906
907
908
909
910
{
assert(ctx->out_of_memory);
ctx->close_callback(newdata, ctx->malloc, ctx->free, ctx->malloc_data);
} // if
} // handle_pp_include
911
912
913
914
915
916
917
static void handle_pp_line(Context *ctx)
{
IncludeState *state = ctx->include_stack;
char *filename = NULL;
int linenum = 0;
int bogus = 0;
918
if (lexer(state) != TOKEN_INT_LITERAL)
919
920
bogus = 1;
else
921
linenum = token_to_int(state);
922
923
if (!bogus)
924
925
926
927
928
929
930
931
932
{
Token t = lexer(state);
if (t == ((Token) '\n'))
{
state->line = linenum;
return;
}
bogus = (t != TOKEN_STRING_LITERAL);
}
933
934
935
936
if (!bogus)
{
state->token++; // skip '\"'...
937
938
939
filename = (char *) alloca(state->tokenlen);
memcpy(filename, state->token, state->tokenlen-1);
filename[state->tokenlen-1] = '\0';
940
941
942
943
944
945
946
947
948
bogus = !require_newline(state);
} // if
if (bogus)
{
fail(ctx, "Invalid #line directive");
return;
} // if
949
950
951
const char *cached = stringcache(ctx->filename_cache, filename);
if (cached == NULL)
out_of_memory(ctx);
952
953
954
955
956
state->filename = cached;
state->line = linenum;
} // handle_pp_line
957
958
959
static void handle_pp_error(Context *ctx)
{
IncludeState *state = ctx->include_stack;
960
961
962
char *ptr = ctx->failstr;
int avail = sizeof (ctx->failstr) - 1;
int cpy = 0;
963
964
int done = 0;
965
966
967
968
969
970
971
const char *prefix = "#error";
const size_t prefixlen = strlen(prefix);
strcpy(ctx->failstr, prefix);
avail -= prefixlen;
ptr += prefixlen;
state->report_whitespace = 1;
972
973
while (!done)
{
974
const Token token = lexer(state);
975
976
977
switch (token)
{
case ((Token) '\n'):
978
979
980
state->line--; // make sure error is on the right line.
// fall through!
case TOKEN_INCOMPLETE_COMMENT:
981
case TOKEN_EOI:
982
pushback(state); // move back so we catch this later.
983
984
985
done = 1;
break;
986
case ((Token) ' '):
987
988
989
990
991
992
if (!avail)
break;
*(ptr++) = ' ';
avail--;
break;
993
default:
994
cpy = Min(avail, (int) state->tokenlen);
995
996
997
998
if (cpy)
memcpy(ptr, state->token, cpy);
ptr += cpy;
avail -= cpy;
999
1000
break;
} // switch