aboutsummaryrefslogtreecommitdiff
path: root/lib.c
blob: c4a6f87832fc0b69bc51773e4fc3969f81ef33c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
/*
 * 'sparse' library helper routines.
 *
 * Copyright (C) 2003 Transmeta Corp.
 *               2003-2004 Linus Torvalds
 *
 *  Licensed under the Open Software License version 1.1
 */
#include <ctype.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>

#include <sys/types.h>

#include "lib.h"
#include "allocate.h"
#include "token.h"
#include "parse.h"
#include "symbol.h"
#include "expression.h"
#include "scope.h"
#include "linearize.h"
#include "target.h"

int verbose, optimize, optimize_size, preprocessing;
int die_if_error = 0;

#ifndef __GNUC__
# define __GNUC__ 2
# define __GNUC_MINOR__ 95
# define __GNUC_PATCHLEVEL__ 0
#endif

int gcc_major = __GNUC__;
int gcc_minor = __GNUC_MINOR__;
int gcc_patchlevel = __GNUC_PATCHLEVEL__;

static const char *gcc_base_dir = GCC_BASE;

struct token *skip_to(struct token *token, int op)
{
	while (!match_op(token, op) && !eof_token(token))
		token = token->next;
	return token;
}

struct token *expect(struct token *token, int op, const char *where)
{
	if (!match_op(token, op)) {
		static struct token bad_token;
		if (token != &bad_token) {
			bad_token.next = token;
			sparse_error(token->pos, "Expected %s %s", show_special(op), where);
			sparse_error(token->pos, "got %s", show_token(token));
		}
		if (op == ';')
			return skip_to(token, op);
		return &bad_token;
	}
	return token->next;
}

unsigned int hexval(unsigned int c)
{
	int retval = 256;
	switch (c) {
	case '0'...'9':
		retval = c - '0';
		break;
	case 'a'...'f':
		retval = c - 'a' + 10;
		break;
	case 'A'...'F':
		retval = c - 'A' + 10;
		break;
	}
	return retval;
}

static void do_warn(const char *type, struct position pos, const char * fmt, va_list args)
{
	static char buffer[512];
	const char *name;

	vsprintf(buffer, fmt, args);	
	name = stream_name(pos.stream);
		
	fprintf(stderr, "%s:%d:%d: %s%s\n",
		name, pos.line, pos.pos, type, buffer);
}

static int max_warnings = 100;
static int show_info = 1;

void info(struct position pos, const char * fmt, ...)
{
	va_list args;

	if (!show_info)
		return;
	va_start(args, fmt);
	do_warn("", pos, fmt, args);
	va_end(args);
}

void warning(struct position pos, const char * fmt, ...)
{
	va_list args;

	if (!max_warnings) {
		show_info = 0;
		return;
	}

	if (!--max_warnings) {
		show_info = 0;
		fmt = "too many warnings";
	}

	va_start(args, fmt);
	do_warn("warning: ", pos, fmt, args);
	va_end(args);
}	

static void do_error(struct position pos, const char * fmt, va_list args)
{
	static int errors = 0;
        die_if_error = 1;
	show_info = 1;
	/* Shut up warnings after an error */
	max_warnings = 0;
	if (errors > 100) {
		static int once = 0;
		show_info = 0;
		if (once)
			return;
		fmt = "too many errors";
		once = 1;
	}

	do_warn("error: ", pos, fmt, args);
	errors++;
}	

void sparse_error(struct position pos, const char * fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	do_error(pos, fmt, args);
	va_end(args);
}

void expression_error(struct expression *expr, const char *fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	do_error(expr->pos, fmt, args);
	va_end(args);
	expr->ctype = &bad_ctype;
}

void error_die(struct position pos, const char * fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	do_warn("error: ", pos, fmt, args);
	va_end(args);
	exit(1);
}

void die(const char *fmt, ...)
{
	va_list args;
	static char buffer[512];

	va_start(args, fmt);
	vsnprintf(buffer, sizeof(buffer), fmt, args);
	va_end(args);

	fprintf(stderr, "%s\n", buffer);
	exit(1);
}

static struct token *pre_buffer_begin = NULL;
static struct token *pre_buffer_end = NULL;

int Waddress_space = 1;
int Wbitwise = 0;
int Wcast_to_as = 0;
int Wcast_truncate = 1;
int Wcontext = 1;
int Wdecl = 1;
int Wdefault_bitfield_sign = 0;
int Wdesignated_init = 1;
int Wdo_while = 0;
int Wenum_mismatch = 1;
int Wnon_pointer_null = 1;
int Wold_initializer = 1;
int Wone_bit_signed_bitfield = 1;
int Wparen_string = 0;
int Wptr_subtraction_blows = 0;
int Wreturn_void = 0;
int Wshadow = 0;
int Wtransparent_union = 0;
int Wtypesign = 0;
int Wundef = 0;
int Wuninitialized = 1;
int Wdeclarationafterstatement = -1;

int dbg_entry = 0;
int dbg_dead = 0;

int preprocess_only;

static enum { STANDARD_C89,
              STANDARD_C94,
              STANDARD_C99,
              STANDARD_GNU89,
              STANDARD_GNU99, } standard = STANDARD_GNU89;

#define CMDLINE_INCLUDE 20
int cmdline_include_nr = 0;
struct cmdline_include cmdline_include[CMDLINE_INCLUDE];


void add_pre_buffer(const char *fmt, ...)
{
	va_list args;
	unsigned int size;
	struct token *begin, *end;
	char buffer[4096];

	va_start(args, fmt);
	size = vsnprintf(buffer, sizeof(buffer), fmt, args);
	va_end(args);
	begin = tokenize_buffer(buffer, size, &end);
	if (!pre_buffer_begin)
		pre_buffer_begin = begin;
	if (pre_buffer_end)
		pre_buffer_end->next = begin;
	pre_buffer_end = end;
}

static char **handle_switch_D(char *arg, char **next)
{
	const char *name = arg + 1;
	const char *value = "1";

	if (!*name || isspace(*name))
		die("argument to `-D' is missing");

	for (;;) {
		char c;
		c = *++arg;
		if (!c)
			break;
		if (isspace((unsigned char)c) || c == '=') {
			*arg = '\0';
			value = arg + 1;
			break;
		}
	}
	add_pre_buffer("#define %s %s\n", name, value);
	return next;
}

static char **handle_switch_E(char *arg, char **next)
{
	if (arg[1] == '\0')
		preprocess_only = 1;
	return next;
}

static char **handle_switch_I(char *arg, char **next)
{
	char *path = arg+1;

	switch (arg[1]) {
	case '-':
		add_pre_buffer("#split_include\n");
		break;

	case '\0':	/* Plain "-I" */
		path = *++next;
		if (!path)
			die("missing argument for -I option");
		/* Fall through */
	default:
		add_pre_buffer("#add_include \"%s/\"\n", path);
	}
	return next;
}

static void add_cmdline_include(char *filename)
{
	int fd = open(filename, O_RDONLY);
	if (fd < 0) {
		perror(filename);
		return;
	}
	if (cmdline_include_nr >= CMDLINE_INCLUDE)
		die("too many include files for %s\n", filename);
	cmdline_include[cmdline_include_nr].filename = filename;
	cmdline_include[cmdline_include_nr].fd = fd;
	cmdline_include_nr++;
}

static char **handle_switch_i(char *arg, char **next)
{
	if (*next && !strcmp(arg, "include"))
		add_cmdline_include(*++next);
	else if (*next && !strcmp(arg, "imacros"))
		add_cmdline_include(*++next);
	else if (*next && !strcmp(arg, "isystem")) {
		char *path = *++next;
		if (!path)
			die("missing argument for -isystem option");
		add_pre_buffer("#add_isystem \"%s/\"\n", path);
	} else if (*next && !strcmp(arg, "idirafter")) {
		char *path = *++next;
		if (!path)
			die("missing argument for -idirafter option");
		add_pre_buffer("#add_dirafter \"%s/\"\n", path);
	}
	return next;
}

static char **handle_switch_M(char *arg, char **next)
{
	if (!strcmp(arg, "MF") || !strcmp(arg,"MQ") || !strcmp(arg,"MT")) {
		if (!*next)
			die("missing argument for -%s option", arg);
		return next + 1;
	}
	return next;
}

static char **handle_switch_m(char *arg, char **next)
{
	if (!strcmp(arg, "m64")) {
		bits_in_long = 64;
		max_int_alignment = 8;
		bits_in_pointer = 64;
		pointer_alignment = 8;
		size_t_ctype = &ulong_ctype;
		ssize_t_ctype = &long_ctype;
	} else if (!strcmp(arg, "msize-long")) {
		size_t_ctype = &ulong_ctype;
		ssize_t_ctype = &long_ctype;
	}
	return next;
}

static char **handle_switch_o(char *arg, char **next)
{
	if (!strcmp (arg, "o")) {       // "-o foo"
		if (!*++next)
			die("argument to '-o' is missing");
	}
	// else "-ofoo"

	return next;
}

static const struct warning {
	const char *name;
	int *flag;
} warnings[] = {
	{ "address-space", &Waddress_space },
	{ "bitwise", &Wbitwise },
	{ "cast-to-as", &Wcast_to_as },
	{ "cast-truncate", &Wcast_truncate },
	{ "context", &Wcontext },
	{ "decl", &Wdecl },
	{ "default-bitfield-sign", &Wdefault_bitfield_sign },
	{ "designated-init", &Wdesignated_init },
	{ "do-while", &Wdo_while },
	{ "enum-mismatch", &Wenum_mismatch },
	{ "non-pointer-null", &Wnon_pointer_null },
	{ "old-initializer", &Wold_initializer },
	{ "one-bit-signed-bitfield", &Wone_bit_signed_bitfield },
	{ "paren-string", &Wparen_string },
	{ "ptr-subtraction-blows", &Wptr_subtraction_blows },
	{ "return-void", &Wreturn_void },
	{ "shadow", &Wshadow },
	{ "transparent-union", &Wtransparent_union },
	{ "typesign", &Wtypesign },
	{ "undef", &Wundef },
	{ "uninitialized", &Wuninitialized },
	{ "declaration-after-statement", &Wdeclarationafterstatement },
};

enum {
	WARNING_OFF,
	WARNING_ON,
	WARNING_FORCE_OFF
};


static char **handle_onoff_switch(char *arg, char **next, const struct warning warnings[], int n)
{
	int flag = WARNING_ON;
	char *p = arg + 1;
	unsigned i;

	if (!strcmp(p, "sparse-all")) {
		for (i = 0; i < n; i++) {
			if (*warnings[i].flag != WARNING_FORCE_OFF)
				*warnings[i].flag = WARNING_ON;
		}
	}

	// Prefixes "no" and "no-" mean to turn warning off.
	if (p[0] == 'n' && p[1] == 'o') {
		p += 2;
		if (p[0] == '-')
			p++;
		flag = WARNING_FORCE_OFF;
	}

	for (i = 0; i < n; i++) {
		if (!strcmp(p,warnings[i].name)) {
			*warnings[i].flag = flag;
			return next;
		}
	}

	// Unknown.
	return NULL;
}

static char **handle_switch_W(char *arg, char **next)
{
	char ** ret = handle_onoff_switch(arg, next, warnings, sizeof warnings/sizeof warnings[0]);
	if (ret)
		return ret;

	// Unknown.
	return next;
}

static struct warning debugs[] = {
	{ "entry", &dbg_entry},
	{ "dead", &dbg_dead},
};


static char **handle_switch_v(char *arg, char **next)
{
	char ** ret = handle_onoff_switch(arg, next, debugs, sizeof debugs/sizeof debugs[0]);
	if (ret)
		return ret;

	// Unknown.
	do {
		verbose++;
	} while (*++arg == 'v');
	return next;
}


static void handle_onoff_switch_finalize(const struct warning warnings[], int n)
{
	unsigned i;

	for (i = 0; i < n; i++) {
		if (*warnings[i].flag == WARNING_FORCE_OFF)
			*warnings[i].flag = WARNING_OFF;
	}
}

static void handle_switch_W_finalize(void)
{
	handle_onoff_switch_finalize(warnings, sizeof(warnings) / sizeof(warnings[0]));

	/* default Wdeclarationafterstatement based on the C dialect */
	if (-1 == Wdeclarationafterstatement)
	{
		switch (standard)
		{
			case STANDARD_C89:
			case STANDARD_C94:
				Wdeclarationafterstatement = 1;
				break;

			case STANDARD_C99:
			case STANDARD_GNU89:
			case STANDARD_GNU99:
				Wdeclarationafterstatement = 0;
				break;

			default:
				assert (0);
		}

	}
}

static void handle_switch_v_finalize(void)
{
	handle_onoff_switch_finalize(debugs, sizeof(debugs) / sizeof(debugs[0]));
}

static char **handle_switch_U(char *arg, char **next)
{
	const char *name = arg + 1;
	add_pre_buffer ("#undef %s\n", name);
	return next;
}

static char **handle_switch_O(char *arg, char **next)
{
	int level = 1;
	if (arg[1] >= '0' && arg[1] <= '9')
		level = arg[1] - '0';
	optimize = level;
	optimize_size = arg[1] == 's';
	return next;
}

static char **handle_switch_ftabstop(char *arg, char **next)
{
	char *end;
	unsigned long val;

	if (*arg == '\0')
		die("error: missing argument to \"-ftabstop=\"");

	/* we silently ignore silly values */
	val = strtoul(arg, &end, 10);
	if (*end == '\0' && 1 <= val && val <= 100)
		tabstop = val;

	return next;
}

static char **handle_switch_f(char *arg, char **next)
{
	int flag = 1;

	arg++;

	if (!strncmp(arg, "tabstop=", 8))
		return handle_switch_ftabstop(arg+8, next);

	/* handle switches w/ arguments above, boolean and only boolean below */

	if (!strncmp(arg, "no-", 3)) {
		flag = 0;
		arg += 3;
	}
	/* handle switch here.. */
	return next;
}

static char **handle_switch_G(char *arg, char **next)
{
	if (!strcmp (arg, "G") && *next)
		return next + 1; // "-G 0"
	else
		return next;     // "-G0" or (bogus) terminal "-G"
}

static char **handle_switch_a(char *arg, char **next)
{
	if (!strcmp (arg, "ansi"))
		standard = STANDARD_C89;

	return next;
}

static char **handle_switch_s(char *arg, char **next)
{
	if (!strncmp (arg, "std=", 4))
	{
		arg += 4;

		if (!strcmp (arg, "c89") ||
		    !strcmp (arg, "iso9899:1990"))
			standard = STANDARD_C89;

		else if (!strcmp (arg, "iso9899:199409"))
			standard = STANDARD_C94;

		else if (!strcmp (arg, "c99") ||
			 !strcmp (arg, "c9x") ||
			 !strcmp (arg, "iso9899:1999") ||
			 !strcmp (arg, "iso9899:199x"))
			standard = STANDARD_C99;

		else if (!strcmp (arg, "gnu89"))
			standard = STANDARD_GNU89;

		else if (!strcmp (arg, "gnu99") || !strcmp (arg, "gnu9x"))
			standard = STANDARD_GNU99;

		else
			die ("Unsupported C dialect");
	}

	return next;
}

static char **handle_nostdinc(char *arg, char **next)
{
	add_pre_buffer("#nostdinc\n");
	return next;
}

static char **handle_base_dir(char *arg, char **next)
{
	gcc_base_dir = *++next;
	if (!gcc_base_dir)
		die("missing argument for -gcc-base-dir option");
	return next;
}

struct switches {
	const char *name;
	char **(*fn)(char *, char **);
};

static char **handle_switch(char *arg, char **next)
{
	static struct switches cmd[] = {
		{ "nostdinc", handle_nostdinc },
		{ "gcc-base-dir", handle_base_dir},
		{ NULL, NULL }
	};
	struct switches *s;

	switch (*arg) {
	case 'D': return handle_switch_D(arg, next);
	case 'E': return handle_switch_E(arg, next);
	case 'I': return handle_switch_I(arg, next);
	case 'i': return handle_switch_i(arg, next);
	case 'M': return handle_switch_M(arg, next);
	case 'm': return handle_switch_m(arg, next);
	case 'o': return handle_switch_o(arg, next);
	case 'U': return handle_switch_U(arg, next);
	case 'v': return handle_switch_v(arg, next);
	case 'W': return handle_switch_W(arg, next);
	case 'O': return handle_switch_O(arg, next);
	case 'f': return handle_switch_f(arg, next);
	case 'G': return handle_switch_G(arg, next);
	case 'a': return handle_switch_a(arg, next);
	case 's': return handle_switch_s(arg, next);
	default:
		break;
	}

	s = cmd;
	while (s->name) {
		if (!strcmp(s->name, arg))
			return s->fn(arg, next);
		s++;
	}

	/*
	 * Ignore unknown command line options:
	 * they're probably gcc switches
	 */
	return next;
}

void declare_builtin_functions(void)
{
	/* Gaah. gcc knows tons of builtin <string.h> functions */
	add_pre_buffer("extern void *__builtin_memcpy(void *, const void *, __SIZE_TYPE__);\n");
	add_pre_buffer("extern void *__builtin_mempcpy(void *, const void *, __SIZE_TYPE__);\n");
	add_pre_buffer("extern void *__builtin_memset(void *, int, __SIZE_TYPE__);\n");
	add_pre_buffer("extern int __builtin_memcmp(const void *, const void *, __SIZE_TYPE__);\n");
	add_pre_buffer("extern char *__builtin_strcat(char *, const char *);\n");
	add_pre_buffer("extern char *__builtin_strncat(char *, const char *, __SIZE_TYPE__);\n");
	add_pre_buffer("extern int __builtin_strcmp(const char *, const char *);\n");
	add_pre_buffer("extern char *__builtin_strchr(const char *, int);\n");
	add_pre_buffer("extern char *__builtin_strcpy(char *, const char *);\n");
	add_pre_buffer("extern char *__builtin_strncpy(char *, const char *, __SIZE_TYPE__);\n");
	add_pre_buffer("extern __SIZE_TYPE__ __builtin_strspn(const char *, const char *);\n");
	add_pre_buffer("extern __SIZE_TYPE__ __builtin_strcspn(const char *, const char *);\n");
	add_pre_buffer("extern char * __builtin_strpbrk(const char *, const char *);\n");
	add_pre_buffer("extern __SIZE_TYPE__ __builtin_strlen(const char *);\n");

	/* And bitwise operations.. */
	add_pre_buffer("extern int __builtin_clz(int);\n");
	add_pre_buffer("extern int __builtin_clzl(long);\n");
	add_pre_buffer("extern int __builtin_clzll(long long);\n");
	add_pre_buffer("extern int __builtin_ctz(int);\n");
	add_pre_buffer("extern int __builtin_ctzl(long);\n");
	add_pre_buffer("extern int __builtin_ctzll(long long);\n");
	add_pre_buffer("extern int __builtin_ffs(int);\n");
	add_pre_buffer("extern int __builtin_ffsl(long);\n");
	add_pre_buffer("extern int __builtin_ffsll(long long);\n");
	add_pre_buffer("extern int __builtin_popcount(unsigned int);\n");
	add_pre_buffer("extern int __builtin_popcountl(unsigned long);\n");
	add_pre_buffer("extern int __builtin_popcountll(unsigned long long);\n");

	/* And some random ones.. */
	add_pre_buffer("extern void *__builtin_return_address(unsigned int);\n");
	add_pre_buffer("extern void *__builtin_extract_return_addr(void *);\n");
	add_pre_buffer("extern void *__builtin_frame_address(unsigned int);\n");
	add_pre_buffer("extern void __builtin_trap(void);\n");
	add_pre_buffer("extern void *__builtin_alloca(__SIZE_TYPE__);\n");
	add_pre_buffer("extern void __builtin_prefetch (const void *, ...);\n");
	add_pre_buffer("extern long __builtin_alpha_extbl(long, long);\n");
	add_pre_buffer("extern long __builtin_alpha_extwl(long, long);\n");
	add_pre_buffer("extern long __builtin_alpha_insbl(long, long);\n");
	add_pre_buffer("extern long __builtin_alpha_inswl(long, long);\n");
	add_pre_buffer("extern long __builtin_alpha_insql(long, long);\n");
	add_pre_buffer("extern long __builtin_alpha_inslh(long, long);\n");
	add_pre_buffer("extern long __builtin_alpha_cmpbge(long, long);\n");
	add_pre_buffer("extern long __builtin_labs(long);\n");
	add_pre_buffer("extern double __builtin_fabs(double);\n");

	/* Add Blackfin-specific stuff */
	add_pre_buffer(
		"#ifdef __bfin__\n"
		"extern void __builtin_bfin_csync(void);\n"
		"extern void __builtin_bfin_ssync(void);\n"
		"extern int __builtin_bfin_norm_fr1x32(int);\n"
		"#endif\n"
	);

	/* And some floating point stuff.. */
	add_pre_buffer("extern int __builtin_isgreater(float, float);\n");
	add_pre_buffer("extern int __builtin_isgreaterequal(float, float);\n");
	add_pre_buffer("extern int __builtin_isless(float, float);\n");
	add_pre_buffer("extern int __builtin_islessequal(float, float);\n");
	add_pre_buffer("extern int __builtin_islessgreater(float, float);\n");
	add_pre_buffer("extern int __builtin_isunordered(float, float);\n");

	/* And some __FORTIFY_SOURCE ones.. */
	add_pre_buffer ("extern __SIZE_TYPE__ __builtin_object_size(void *, int);\n");
	add_pre_buffer ("extern void * __builtin___memcpy_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern void * __builtin___memmove_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern void * __builtin___mempcpy_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern void * __builtin___memset_chk(void *, int, __SIZE_TYPE__, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern int __builtin___sprintf_chk(char *, int, __SIZE_TYPE__, const char *, ...);\n");
	add_pre_buffer ("extern int __builtin___snprintf_chk(char *, __SIZE_TYPE__, int , __SIZE_TYPE__, const char *, ...);\n");
	add_pre_buffer ("extern char * __builtin___stpcpy_chk(char *, const char *, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern char * __builtin___strcat_chk(char *, const char *, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern char * __builtin___strcpy_chk(char *, const char *, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern char * __builtin___strncat_chk(char *, const char *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern char * __builtin___strncpy_chk(char *, const char *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
	add_pre_buffer ("extern int __builtin___vsprintf_chk(char *, int, __SIZE_TYPE__, const char *, __builtin_va_list);\n");
	add_pre_buffer ("extern int __builtin___vsnprintf_chk(char *, __SIZE_TYPE__, int, __SIZE_TYPE__, const char *, __builtin_va_list ap);\n");
	add_pre_buffer ("extern void __builtin_unreachable(void);\n");
}

void create_builtin_stream(void)
{
	add_pre_buffer("#weak_define __GNUC__ %d\n", gcc_major);
	add_pre_buffer("#weak_define __GNUC_MINOR__ %d\n", gcc_minor);
	add_pre_buffer("#weak_define __GNUC_PATCHLEVEL__ %d\n", gcc_patchlevel);

	/* We add compiler headers path here because we have to parse
	 * the arguments to get it, falling back to default. */
	add_pre_buffer("#add_system \"%s/include\"\n", gcc_base_dir);
	add_pre_buffer("#add_system \"%s/include-fixed\"\n", gcc_base_dir);

	add_pre_buffer("#define __extension__\n");
	add_pre_buffer("#define __pragma__\n");

	// gcc defines __SIZE_TYPE__ to be size_t.  For linux/i86 and
	// solaris/sparc that is really "unsigned int" and for linux/x86_64
	// it is "long unsigned int".  In either case we can probably
	// get away with this.  We need the #weak_define as cgcc will define
	// the right __SIZE_TYPE__.
	if (size_t_ctype == &ulong_ctype)
		add_pre_buffer("#weak_define __SIZE_TYPE__ long unsigned int\n");
	else
		add_pre_buffer("#weak_define __SIZE_TYPE__ unsigned int\n");
	add_pre_buffer("#weak_define __STDC__ 1\n");

	switch (standard)
	{
		case STANDARD_C89:
			add_pre_buffer("#weak_define __STRICT_ANSI__\n");
			break;

		case STANDARD_C94:
			add_pre_buffer("#weak_define __STDC_VERSION__ 199409L\n");
			add_pre_buffer("#weak_define __STRICT_ANSI__\n");
			break;

		case STANDARD_C99:
			add_pre_buffer("#weak_define __STDC_VERSION__ 199901L\n");
			add_pre_buffer("#weak_define __STRICT_ANSI__\n");
			break;

		case STANDARD_GNU89:
			break;

		case STANDARD_GNU99:
			add_pre_buffer("#weak_define __STDC_VERSION__ 199901L\n");
			break;

		default:
			assert (0);
	}

	add_pre_buffer("#define __builtin_stdarg_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
	add_pre_buffer("#define __builtin_va_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
	add_pre_buffer("#define __builtin_ms_va_start(a,b) ((a) = (__builtin_ms_va_list)(&(b)))\n");
	add_pre_buffer("#define __builtin_va_arg(arg,type)  ({ type __va_arg_ret = *(type *)(arg); arg += sizeof(type); __va_arg_ret; })\n");
	add_pre_buffer("#define __builtin_va_alist (*(void *)0)\n");
	add_pre_buffer("#define __builtin_va_arg_incr(x) ((x) + 1)\n");
	add_pre_buffer("#define __builtin_va_copy(dest, src) ({ dest = src; (void)0; })\n");
	add_pre_buffer("#define __builtin_va_end(arg)\n");
	add_pre_buffer("#define __builtin_ms_va_end(arg)\n");

	/* FIXME! We need to do these as special magic macros at expansion time! */
	add_pre_buffer("#define __BASE_FILE__ \"base_file.c\"\n");

	if (optimize)
		add_pre_buffer("#define __OPTIMIZE__ 1\n");
	if (optimize_size)
		add_pre_buffer("#define __OPTIMIZE_SIZE__ 1\n");

	/* GCC defines these for limits.h */
	add_pre_buffer("#weak_define __SHRT_MAX__ " STRINGIFY(__SHRT_MAX__) "\n");
	add_pre_buffer("#weak_define __SCHAR_MAX__ " STRINGIFY(__SCHAR_MAX__) "\n");
	add_pre_buffer("#weak_define __INT_MAX__ " STRINGIFY(__INT_MAX__) "\n");
	add_pre_buffer("#weak_define __LONG_MAX__ " STRINGIFY(__LONG_MAX__) "\n");
	add_pre_buffer("#weak_define __LONG_LONG_MAX__ " STRINGIFY(__LONG_LONG_MAX__) "\n");
	add_pre_buffer("#weak_define __WCHAR_MAX__ " STRINGIFY(__WCHAR_MAX__) "\n");
}

static struct symbol_list *sparse_tokenstream(struct token *token)
{
	// Preprocess the stream
	token = preprocess(token);

	if (preprocess_only) {
		while (!eof_token(token)) {
			int prec = 1;
			struct token *next = token->next;
			const char *separator = "";
			if (next->pos.whitespace)
				separator = " ";
			if (next->pos.newline) {
				separator = "\n\t\t\t\t\t";
				prec = next->pos.pos;
				if (prec > 4)
					prec = 4;
			}
			printf("%s%.*s", show_token(token), prec, separator);
			token = next;
		}
		putchar('\n');

		return NULL;
	}

	// Parse the resulting C code
	while (!eof_token(token))
		token = external_declaration(token, &translation_unit_used_list);
	return translation_unit_used_list;
}

static struct symbol_list *sparse_file(const char *filename)
{
	int fd;
	struct token *token;

	if (strcmp (filename, "-") == 0) {
		fd = 0;
	} else {
		fd = open(filename, O_RDONLY);
		if (fd < 0)
			die("No such file: %s", filename);
	}

	// Tokenize the input stream
	token = tokenize(filename, fd, NULL, includepath);
	close(fd);

	return sparse_tokenstream(token);
}

/*
 * This handles the "-include" directive etc: we're in global
 * scope, and all types/macros etc will affect all the following
 * files.
 *
 * NOTE NOTE NOTE! "#undef" of anything in this stage will
 * affect all subsequent files too, i.e. we can have non-local
 * behaviour between files!
 */
static struct symbol_list *sparse_initial(void)
{
	struct token *token;
	int i;

	// Prepend any "include" file to the stream.
	// We're in global scope, it will affect all files!
	token = NULL;
	for (i = cmdline_include_nr - 1; i >= 0; i--)
		token = tokenize(cmdline_include[i].filename, cmdline_include[i].fd,
				 token, includepath);

	// Prepend the initial built-in stream
	if (token)
		pre_buffer_end->next = token;
	return sparse_tokenstream(pre_buffer_begin);
}

struct symbol_list *sparse_initialize(int argc, char **argv, struct string_list **filelist)
{
	char **args;
	struct symbol_list *list;

	// Initialize symbol stream first, so that we can add defines etc
	init_symbols();

	args = argv;
	for (;;) {
		char *arg = *++args;
		if (!arg)
			break;

		if (arg[0] == '-' && arg[1]) {
			args = handle_switch(arg+1, args);
			continue;
		}
		add_ptr_list_notag(filelist, arg);
	}
	handle_switch_W_finalize();
	handle_switch_v_finalize();

	list = NULL;
	if (!ptr_list_empty(filelist)) {
		// Initialize type system
		init_ctype();

		create_builtin_stream();
		add_pre_buffer("#define __CHECKER__ 1\n");
		if (!preprocess_only)
			declare_builtin_functions();

		list = sparse_initial();

		/*
		 * Protect the initial token allocations, since
		 * they need to survive all the others
		 */
		protect_token_alloc();
	}
	return list;
}

struct symbol_list * sparse_keep_tokens(char *filename)
{
	struct symbol_list *res;

	/* Clear previous symbol list */
	translation_unit_used_list = NULL;

	new_file_scope();
	res = sparse_file(filename);

	/* And return it */
	return res;
}


struct symbol_list * __sparse(char *filename)
{
	struct symbol_list *res;

	res = sparse_keep_tokens(filename);

	/* Drop the tokens for this file after parsing */
	clear_token_alloc();

	/* And return it */
	return res;
}

struct symbol_list * sparse(char *filename)
{
	struct symbol_list *res = __sparse(filename);

	/* Evaluate the complete symbol list */
	evaluate_symbol_list(res);

	return res;
}