/
mojoshader_preprocessor.c
2564 lines (2162 loc) · 71.8 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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
} // 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)
{
if (ptr != NULL) // check for NULL in case of dumb free() impl.
ctx->free(ptr, ctx->malloc_data);
} // 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);
99
vsnprintf(ctx->failstr, sizeof (ctx->failstr), fmt, ap);
100
101
102
103
104
105
106
107
108
va_end(ap);
} // failf
static inline void fail(Context *ctx, const char *reason)
{
failf(ctx, "%s", reason);
} // fail
109
110
111
112
113
114
115
116
117
118
119
#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");
120
121
else if (token[i] == '\\')
printf("\\\\");
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
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);
152
TOKENCASE(TOKEN_HASH);
153
154
155
156
157
158
159
160
161
162
163
164
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);
165
TOKENCASE(TOKEN_PP_PRAGMA);
166
167
TOKENCASE(TOKEN_INCOMPLETE_COMMENT);
TOKENCASE(TOKEN_BAD_CHARS);
168
TOKENCASE(TOKEN_EOI);
169
TOKENCASE(TOKEN_PREPROCESSING_ERROR);
170
171
172
173
174
175
#undef TOKENCASE
case ((Token) '\n'):
printf("'\\n'");
break;
176
177
178
179
case ((Token) '\\'):
printf("'\\\\'");
break;
180
181
182
183
184
185
186
187
188
189
default:
assert(((int)tokenval) < 256);
printf("'%c'", (char) tokenval);
break;
} // switch
printf(")\n");
} // MOJOSHADER_print_debug_token
#endif
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
#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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
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;
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
#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
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
// 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;
305
static void init_buffer(Buffer *buffer)
306
307
308
309
310
{
buffer->total_bytes = 0;
buffer->head.bytes = 0;
buffer->head.next = NULL;
buffer->tail = &buffer->head;
311
} // init_buffer
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
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)
{
345
char *retval = (char *) m(buffer->total_bytes + 1, d);
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
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
374
init_buffer(buffer);
375
376
377
} // free_buffer
378
// !!! FIXME: maybe use these pool magic elsewhere?
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
// 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; \
407
ctx->poolname##_pool = item; \
408
409
410
411
412
413
414
415
416
}
#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)
417
IMPLEMENT_POOL(Define, define)
418
419
420
421
// Preprocessor define hashtable stuff...
422
423
// !!! FIXME: why isn't this using mojoshader_common.c's code?
424
425
// this is djb's xor hashing function.
static inline uint32 hash_string_djbxor(const char *sym)
426
{
427
register uint32 hash = 5381;
428
while (*sym)
429
430
431
432
433
434
435
hash = ((hash << 5) + hash) ^ *(sym++);
return hash;
} // hash_string_djbxor
static inline uint8 hash_define(const char *sym)
{
return (uint8) hash_string_djbxor(sym);
436
437
438
} // hash_define
439
static int add_define(Context *ctx, const char *sym, const char *val,
440
char **parameters, int paramcount)
441
{
442
const uint8 hash = hash_define(sym);
443
Define *bucket = ctx->define_hashtable[hash];
444
445
while (bucket)
{
446
if (strcmp(bucket->identifier, sym) == 0)
447
{
448
449
failf(ctx, "'%s' already defined", sym); // !!! FIXME: warning?
// !!! FIXME: gcc reports the location of previous #define here.
450
451
452
453
454
return 0;
} // if
bucket = bucket->next;
} // while
455
bucket = get_define(ctx);
456
457
458
if (bucket == NULL)
return 0;
459
bucket->definition = val;
460
bucket->original = NULL;
461
462
463
bucket->identifier = sym;
bucket->parameters = (const char **) parameters;
bucket->paramcount = paramcount;
464
465
466
467
468
469
bucket->next = ctx->define_hashtable[hash];
ctx->define_hashtable[hash] = bucket;
return 1;
} // add_define
470
471
static void free_define(Context *ctx, Define *def)
{
472
473
474
475
476
477
478
479
480
481
482
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
483
484
485
} // free_define
486
487
static int remove_define(Context *ctx, const char *sym)
{
488
const uint8 hash = hash_define(sym);
489
490
Define *bucket = ctx->define_hashtable[hash];
Define *prev = NULL;
491
492
while (bucket)
{
493
if (strcmp(bucket->identifier, sym) == 0)
494
495
496
497
498
{
if (prev == NULL)
ctx->define_hashtable[hash] = bucket->next;
else
prev->next = bucket->next;
499
free_define(ctx, bucket);
500
501
502
503
504
505
506
507
508
509
return 1;
} // if
prev = bucket;
bucket = bucket->next;
} // while
return 0;
} // remove_define
510
static const Define *find_define(Context *ctx, const char *sym)
511
{
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
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
543
const uint8 hash = hash_define(sym);
544
Define *bucket = ctx->define_hashtable[hash];
545
546
while (bucket)
{
547
if (strcmp(bucket->identifier, sym) == 0)
548
return bucket;
549
550
551
552
553
554
bucket = bucket->next;
} // while
return NULL;
} // find_define
555
556
557
558
559
560
561
562
563
564
565
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
566
567
static const Define *find_macro_arg(const IncludeState *state,
const Define *defines)
568
569
570
571
572
573
{
const Define *def = NULL;
char *sym = (char *) alloca(state->tokenlen + 1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
574
for (def = defines; def != NULL; def = def->next)
575
{
576
assert(def->parameters == NULL); // args can't have args!
577
578
579
580
581
582
583
584
585
assert(def->paramcount == 0); // args can't have args!
if (strcmp(def->identifier, sym) == 0)
break;
} // while
return def;
} // find_macro_arg
586
static void put_all_defines(Context *ctx)
587
{
588
size_t i;
589
590
for (i = 0; i < STATICARRAYLEN(ctx->define_hashtable); i++)
{
591
Define *bucket = ctx->define_hashtable[i];
592
593
594
ctx->define_hashtable[i] = NULL;
while (bucket)
{
595
Define *next = bucket->next;
596
free_define(ctx, bucket);
597
598
599
bucket = next;
} // while
} // for
600
} // put_all_defines
601
602
603
static int push_source(Context *ctx, const char *fname, const char *source,
604
unsigned int srclen, unsigned int linenum,
605
MOJOSHADER_includeClose close_callback)
606
{
607
IncludeState *state = get_include(ctx);
608
609
610
if (state == NULL)
return 0;
611
if (fname != NULL)
612
{
613
state->filename = stringcache(ctx->filename_cache, fname);
614
615
if (state->filename == NULL)
{
616
out_of_memory(ctx);
617
put_include(ctx, state);
618
619
return 0;
} // if
620
621
} // if
622
state->close_callback = close_callback;
623
624
625
state->source_base = source;
state->source = source;
state->token = source;
626
state->tokenval = ((Token) '\n');
627
state->orig_length = srclen;
628
state->bytes_left = srclen;
629
state->line = linenum;
630
state->next = ctx->include_stack;
631
state->asm_comments = ctx->asm_comments;
632
633
634
print_debug_lexing_position(state);
635
636
637
638
639
640
641
642
643
ctx->include_stack = state;
return 1;
} // push_source
static void pop_source(Context *ctx)
{
IncludeState *state = ctx->include_stack;
644
assert(state != NULL); // more pops than pushes!
645
646
647
if (state == NULL)
return;
648
if (state->close_callback)
649
{
650
651
state->close_callback(state->source_base, ctx->malloc,
ctx->free, ctx->malloc_data);
652
653
} // if
654
655
// state->filename is a pointer to the filename cache; don't free it here!
656
657
658
659
660
661
662
Conditional *cond = state->conditional_stack;
while (cond)
{
Conditional *next = cond->next;
put_conditional(ctx, cond);
cond = next;
} // while
663
664
ctx->include_stack = state->next;
665
666
667
print_debug_lexing_position(ctx->include_stack);
668
put_include(ctx, state);
669
670
671
} // pop_source
672
673
674
675
676
677
678
static void close_define_include(const char *data, MOJOSHADER_malloc m,
MOJOSHADER_free f, void *d)
{
f((void *) data, d);
} // close_define_include
679
680
681
682
Preprocessor *preprocessor_start(const char *fname, const char *source,
unsigned int sourcelen,
MOJOSHADER_includeOpen open_callback,
MOJOSHADER_includeClose close_callback,
683
const MOJOSHADER_preprocessorDefine *defines,
684
unsigned int define_count, int asm_comments,
685
686
687
MOJOSHADER_malloc m, MOJOSHADER_free f, void *d)
{
int okay = 1;
688
unsigned int i = 0;
689
690
691
692
693
694
695
// 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)
696
return NULL;
697
698
699
700
701
702
703
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;
704
ctx->asm_comments = asm_comments;
705
706
ctx->filename_cache = stringcache_create(m, f, d);
707
708
709
710
711
712
713
714
715
716
717
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);
718
719
720
721
// let the usual preprocessor parser sort these out.
char *define_include = NULL;
unsigned int define_include_len = 0;
722
if ((okay) && (define_count > 0))
723
{
724
for (i = 0; i < define_count; i++)
725
{
726
727
define_include_len += strlen(defines[i].identifier);
define_include_len += strlen(defines[i].definition);
728
729
730
731
732
733
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)
734
okay = 0;
735
736
737
738
739
else
{
char *ptr = define_include;
for (i = 0; i < define_count; i++)
{
740
741
ptr += sprintf(ptr, "#define %s %s\n", defines[i].identifier,
defines[i].definition);
742
743
744
} // for
} // else
} // if
745
746
if ((okay) && (!push_source(ctx,fname,source,sourcelen,1,NULL)))
747
748
okay = 0;
749
750
751
if ((okay) && (define_include != NULL))
{
okay = push_source(ctx, "<predefined macros>", define_include,
752
define_include_len, 1, close_define_include);
753
754
} // if
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
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);
774
775
put_all_defines(ctx);
776
777
778
if (ctx->filename_cache != NULL)
stringcache_destroy(ctx->filename_cache);
779
780
free_define(ctx, ctx->file_macro);
free_define(ctx, ctx->line_macro);
781
free_define_pool(ctx);
782
free_conditional_pool(ctx);
783
free_include_pool(ctx);
784
785
786
787
788
789
790
791
792
793
794
795
Free(ctx, ctx);
} // preprocessor_end
int preprocessor_outofmemory(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
return ctx->out_of_memory;
} // preprocessor_outofmemory
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
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
815
// !!! FIXME: parsing fails on preprocessor directives should skip rest of line.
816
817
static int require_newline(IncludeState *state)
{
818
819
const Token token = lexer(state);
pushback(state); // rewind no matter what.
820
return ( (token == TOKEN_INCOMPLETE_COMMENT) || // call it an eol.
821
(token == ((Token) '\n')) || (token == TOKEN_EOI) );
822
823
824
} // require_newline
825
826
827
828
829
830
831
832
833
834
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
835
836
837
static void handle_pp_include(Context *ctx)
{
IncludeState *state = ctx->include_stack;
838
Token token = lexer(state);
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
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';
878
bogus = !require_newline(state);
879
880
881
882
883
884
885
886
887
888
} // if
if (bogus)
{
fail(ctx, "Invalid #include directive");
return;
} // else
const char *newdata = NULL;
unsigned int newbytes = 0;
889
890
891
892
893
894
if ((ctx->open_callback == NULL) || (ctx->close_callback == NULL))
{
fail(ctx, "Saw #include, but no include callbacks defined");
return;
} // if
895
896
897
898
899
900
901
902
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
903
MOJOSHADER_includeClose callback = ctx->close_callback;
904
if (!push_source(ctx, filename, newdata, newbytes, 1, callback))
905
906
907
908
909
910
911
{
assert(ctx->out_of_memory);
ctx->close_callback(newdata, ctx->malloc, ctx->free, ctx->malloc_data);
} // if
} // handle_pp_include
912
913
914
915
916
917
918
static void handle_pp_line(Context *ctx)
{
IncludeState *state = ctx->include_stack;
char *filename = NULL;
int linenum = 0;
int bogus = 0;
919
if (lexer(state) != TOKEN_INT_LITERAL)
920
921
bogus = 1;
else
922
linenum = token_to_int(state);
923
924
if (!bogus)
925
926
927
928
929
930
931
932
933
{
Token t = lexer(state);
if (t == ((Token) '\n'))
{
state->line = linenum;
return;
}
bogus = (t != TOKEN_STRING_LITERAL);
}
934
935
936
937
if (!bogus)
{
state->token++; // skip '\"'...
938
939
940
filename = (char *) alloca(state->tokenlen);
memcpy(filename, state->token, state->tokenlen-1);
filename[state->tokenlen-1] = '\0';
941
942
943
944
945
946
947
948
949
bogus = !require_newline(state);
} // if
if (bogus)
{
fail(ctx, "Invalid #line directive");
return;
} // if
950
951
952
const char *cached = stringcache(ctx->filename_cache, filename);
if (cached == NULL)
out_of_memory(ctx);
953
954
955
956
957
state->filename = cached;
state->line = linenum;
} // handle_pp_line
958
959
960
static void handle_pp_error(Context *ctx)
{
IncludeState *state = ctx->include_stack;
961
962
963
char *ptr = ctx->failstr;
int avail = sizeof (ctx->failstr) - 1;
int cpy = 0;
964
965
int done = 0;
966
967
968
969
970
971
972
const char *prefix = "#error";
const size_t prefixlen = strlen(prefix);
strcpy(ctx->failstr, prefix);
avail -= prefixlen;
ptr += prefixlen;
state->report_whitespace = 1;
973
974
while (!done)
{
975
const Token token = lexer(state);
976
977
978
switch (token)
{
case ((Token) '\n'):
979
980
981
state->line--; // make sure error is on the right line.
// fall through!
case TOKEN_INCOMPLETE_COMMENT:
982
case TOKEN_EOI:
983
pushback(state); // move back so we catch this later.
984
985
986
done = 1;
break;
987
case ((Token) ' '):
988
989
990
991
992
993
if (!avail)
break;
*(ptr++) = ' ';
avail--;
break;
994
default:
995
cpy = Min(avail, (int) state->tokenlen);
996
997
998
999
if (cpy)
memcpy(ptr, state->token, cpy);
ptr += cpy;
avail -= cpy;
1000
break;