summaryrefslogtreecommitdiffstats
path: root/scripts/genksyms/genksyms.c
blob: 4a350816a9e8eb737e2c7170dc7f3c20ca7bb6af (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
/* Generate kernel symbol version hashes.
   Copyright 1996, 1997 Linux International.

   New implementation contributed by Richard Henderson <rth@tamu.edu>
   Based on original work by Bjorn Ekwall <bj0rn@blox.se>

   This file was part of the Linux modutils 2.4.22: moved back into the
   kernel sources by Rusty Russell/Kai Germaschewski.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2 of the License, or (at your
   option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <stdarg.h>
#ifdef __GNU_LIBRARY__
#include <getopt.h>
#endif				/* __GNU_LIBRARY__ */

#include "genksyms.h"
/*----------------------------------------------------------------------*/

#define HASH_BUCKETS  4096

static struct symbol *symtab[HASH_BUCKETS];
static FILE *debugfile;

int cur_line = 1;
char *cur_filename;

static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
	   flag_preserve, flag_warnings;
static const char *arch = "";
static const char *mod_prefix = "";

static int errors;
static int nsyms;

static struct symbol *expansion_trail;
static struct symbol *visited_symbols;

static const struct {
	int n;
	const char *name;
} symbol_types[] = {
	[SYM_NORMAL]     = { 0, NULL},
	[SYM_TYPEDEF]    = {'t', "typedef"},
	[SYM_ENUM]       = {'e', "enum"},
	[SYM_STRUCT]     = {'s', "struct"},
	[SYM_UNION]      = {'u', "union"},
};

static int equal_list(struct string_list *a, struct string_list *b);
static void print_list(FILE * f, struct string_list *list);
static struct string_list *concat_list(struct string_list *start, ...);
static struct string_list *mk_node(const char *string);
static void print_location(void);
static void print_type_name(enum symbol_type type, const char *name);

/*----------------------------------------------------------------------*/

static const unsigned int crctab32[] = {
	0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U,
	0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U,
	0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U,
	0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU,
	0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U,
	0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U,
	0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U,
	0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU,
	0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U,
	0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU,
	0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U,
	0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U,
	0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U,
	0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU,
	0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU,
	0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U,
	0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU,
	0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U,
	0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U,
	0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U,
	0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU,
	0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U,
	0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U,
	0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU,
	0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U,
	0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U,
	0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U,
	0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U,
	0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U,
	0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU,
	0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU,
	0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U,
	0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U,
	0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU,
	0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU,
	0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U,
	0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU,
	0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U,
	0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU,
	0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U,
	0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU,
	0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U,
	0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U,
	0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU,
	0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U,
	0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U,
	0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U,
	0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U,
	0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U,
	0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U,
	0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU,
	0x2d02ef8dU
};

static unsigned long partial_crc32_one(unsigned char c, unsigned long crc)
{
	return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
}

static unsigned long partial_crc32(const char *s, unsigned long crc)
{
	while (*s)
		crc = partial_crc32_one(*s++, crc);
	return crc;
}

static unsigned long crc32(const char *s)
{
	return partial_crc32(s, 0xffffffff) ^ 0xffffffff;
}

/*----------------------------------------------------------------------*/

static enum symbol_type map_to_ns(enum symbol_type t)
{
	if (t == SYM_TYPEDEF)
		t = SYM_NORMAL;
	else if (t == SYM_UNION)
		t = SYM_STRUCT;
	return t;
}

struct symbol *find_symbol(const char *name, enum symbol_type ns, int exact)
{
	unsigned long h = crc32(name) % HASH_BUCKETS;
	struct symbol *sym;

	for (sym = symtab[h]; sym; sym = sym->hash_next)
		if (map_to_ns(sym->type) == map_to_ns(ns) &&
		    strcmp(name, sym->name) == 0 &&
		    sym->is_declared)
			break;

	if (exact && sym && sym->type != ns)
		return NULL;
	return sym;
}

static int is_unknown_symbol(struct symbol *sym)
{
	struct string_list *defn;

	return ((sym->type == SYM_STRUCT ||
		 sym->type == SYM_UNION ||
		 sym->type == SYM_ENUM) &&
		(defn = sym->defn)  && defn->tag == SYM_NORMAL &&
			strcmp(defn->string, "}") == 0 &&
		(defn = defn->next) && defn->tag == SYM_NORMAL &&
			strcmp(defn->string, "UNKNOWN") == 0 &&
		(defn = defn->next) && defn->tag == SYM_NORMAL &&
			strcmp(defn->string, "{") == 0);
}

static struct symbol *__add_symbol(const char *name, enum symbol_type type,
			    struct string_list *defn, int is_extern,
			    int is_reference)
{
	unsigned long h = crc32(name) % HASH_BUCKETS;
	struct symbol *sym;
	enum symbol_status status = STATUS_UNCHANGED;

	for (sym = symtab[h]; sym; sym = sym->hash_next) {
		if (map_to_ns(sym->type) == map_to_ns(type) &&
		    strcmp(name, sym->name) == 0) {
			if (is_reference)
				/* fall through */ ;
			else if (sym->type == type &&
				 equal_list(sym->defn, defn)) {
				if (!sym->is_declared && sym->is_override) {
					print_location();
					print_type_name(type, name);
					fprintf(stderr, " modversion is "
						"unchanged\n");
				}
				sym->is_declared = 1;
				return sym;
			} else if (!sym->is_declared) {
				if (sym->is_override && flag_preserve) {
					print_location();
					fprintf(stderr, "ignoring ");
					print_type_name(type, name);
					fprintf(stderr, " modversion change\n");
					sym->is_declared = 1;
					return sym;
				} else {
					status = is_unknown_symbol(sym) ?
						STATUS_DEFINED : STATUS_MODIFIED;
				}
			} else {
				error_with_pos("redefinition of %s", name);
				return sym;
			}
			break;
		}
	}

	if (sym) {
		struct symbol **psym;

		for (psym = &symtab[h]; *psym; psym = &(*psym)->hash_next) {
			if (*psym == sym) {
				*psym = sym->hash_next;
				break;
			}
		}
		--nsyms;
	}

	sym = xmalloc(sizeof(*sym));
	sym->name = name;
	sym->type = type;
	sym->defn = defn;
	sym->expansion_trail = NULL;
	sym->visited = NULL;
	sym->is_extern = is_extern;

	sym->hash_next = symtab[h];
	symtab[h] = sym;

	sym->is_declared = !is_reference;
	sym->status = status;
	sym->is_override = 0;

	if (flag_debug) {
		if (symbol_types[type].name)
			fprintf(debugfile, "Defn for %s %s == <",
				symbol_types[type].name, name);
		else
			fprintf(debugfile, "Defn for type%d %s == <",
				type, name);
		if (is_extern)
			fputs("extern ", debugfile);
		print_list(debugfile, defn);
		fputs(">\n", debugfile);
	}

	++nsyms;
	return sym;
}

struct symbol *add_symbol(const char *name, enum symbol_type type,
			  struct string_list *defn, int is_extern)
{
	return __add_symbol(name, type, defn, is_extern, 0);
}

static struct symbol *add_reference_symbol(const char *name, enum symbol_type type,
				    struct string_list *defn, int is_extern)
{
	return __add_symbol(name, type, defn, is_extern, 1);
}

/*----------------------------------------------------------------------*/

void free_node(struct string_list *node)
{
	free(node->string);
	free(node);
}

void free_list(struct string_list *s, struct string_list *e)
{
	while (s != e) {
		struct string_list *next = s->next;
		free_node(s);
		s = next;
	}
}

static struct string_list *mk_node(const char *string)
{
	struct string_list *newnode;

	newnode = xmalloc(sizeof(*newnode));
	newnode->string = xstrdup(string);
	newnode->tag = SYM_NORMAL;
	newnode->next = NULL;

	return newnode;
}

static struct string_list *concat_list(struct string_list *start, ...)
{
	va_list ap;
	struct string_list *n, *n2;

	if (!start)
		return NULL;
	for (va_start(ap, start); (n = va_arg(ap, struct string_list *));) {
		for (n2 = n; n2->next; n2 = n2->next)
			;
		n2->next = start;
		start = n;
	}
	va_end(ap);
	return start;
}

struct string_list *copy_node(struct string_list *node)
{
	struct string_list *newnode;

	newnode = xmalloc(sizeof(*newnode));
	newnode->string = xstrdup(node->string);
	newnode->tag = node->tag;

	return newnode;
}

static int equal_list(struct string_list *a, struct string_list *b)
{
	while (a && b) {
		if (a->tag != b->tag || strcmp(a->string, b->string))
			return 0;
		a = a->next;
		b = b->next;
	}

	return !a && !b;
}

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

static struct string_list *read_node(FILE *f)
{
	char buffer[256];
	struct string_list node = {
		.string = buffer,
		.tag = SYM_NORMAL };
	int c;

	while ((c = fgetc(f)) != EOF) {
		if (c == ' ') {
			if (node.string == buffer)
				continue;
			break;
		} else if (c == '\n') {
			if (node.string == buffer)
				return NULL;
			ungetc(c, f);
			break;
		}
		if (node.string >= buffer + sizeof(buffer) - 1) {
			fprintf(stderr, "Token too long\n");
			exit(1);
		}
		*node.string++ = c;
	}
	if (node.string == buffer)
		return NULL;
	*node.string = 0;
	node.string = buffer;

	if (node.string[1] == '#') {
		int n;

		for (n = 0; n < ARRAY_SIZE(symbol_types); n++) {
			if (node.string[0] == symbol_types[n].n) {
				node.tag = n;
				node.string += 2;
				return copy_node(&node);
			}
		}
		fprintf(stderr, "Unknown type %c\n", node.string[0]);
		exit(1);
	}
	return copy_node(&node);
}

static void read_reference(FILE *f)
{
	while (!feof(f)) {
		struct string_list *defn = NULL;
		struct string_list *sym, *def;
		int is_extern = 0, is_override = 0;
		struct symbol *subsym;

		sym = read_node(f);
		if (sym && sym->tag == SYM_NORMAL &&
		    !strcmp(sym->string, "override")) {
			is_override = 1;
			free_node(sym);
			sym = read_node(f);
		}
		if (!sym)
			continue;
		def = read_node(f);
		if (def && def->tag == SYM_NORMAL &&
		    !strcmp(def->string, "extern")) {
			is_extern = 1;
			free_node(def);
			def = read_node(f);
		}
		while (def) {
			def->next = defn;
			defn = def;
			def = read_node(f);
		}
		subsym = add_reference_symbol(xstrdup(sym->string), sym->tag,
					      defn, is_extern);
		subsym->is_override = is_override;
		free_node(sym);
	}
}

static void print_node(FILE * f, struct string_list *list)
{
	if (symbol_types[list->tag].n) {
		putc(symbol_types[list->tag].n, f);
		putc('#', f);
	}
	fputs(list->string, f);
}

static void print_list(FILE * f, struct string_list *list)
{
	struct string_list **e, **b;
	struct string_list *tmp, **tmp2;
	int elem = 1;

	if (list == NULL) {
		fputs("(nil)", f);
		return;
	}

	tmp = list;
	while ((tmp = tmp->next) != NULL)
		elem++;

	b = alloca(elem * sizeof(*e));
	e = b + elem;
	tmp2 = e - 1;

	(*tmp2--) = list;
	while ((list = list->next) != NULL)
		*(tmp2--) = list;

	while (b != e) {
		print_node(f, *b++);
		putc(' ', f);
	}
}

static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc)
{
	struct string_list *list = sym->defn;
	struct string_list **e, **b;
	struct string_list *tmp, **tmp2;
	int elem = 1;

	if (!list)
		return crc;

	tmp = list;
	while ((tmp = tmp->next) != NULL)
		elem++;

	b = alloca(elem * sizeof(*e));
	e = b + elem;
	tmp2 = e - 1;

	*(tmp2--) = list;
	while ((list = list->next) != NULL)
		*(tmp2--) = list;

	while (b != e) {
		struct string_list *cur;
		struct symbol *subsym;

		cur = *(b++);
		switch (cur->tag) {
		case SYM_NORMAL:
			if (flag_dump_defs)
				fprintf(debugfile, "%s ", cur->string);
			crc = partial_crc32(cur->string, crc);
			crc = partial_crc32_one(' ', crc);
			break;

		case SYM_TYPEDEF:
			subsym = find_symbol(cur->string, cur->tag, 0);
			/* FIXME: Bad reference files can segfault here. */
			if (subsym->expansion_trail) {
				if (flag_dump_defs)
					fprintf(debugfile, "%s ", cur->string);
				crc = partial_crc32(cur->string, crc);
				crc = partial_crc32_one(' ', crc);
			} else {
				subsym->expansion_trail = expansion_trail;
				expansion_trail = subsym;
				crc = expand_and_crc_sym(subsym, crc);
			}
			break;

		case SYM_STRUCT:
		case SYM_UNION:
		case SYM_ENUM:
			subsym = find_symbol(cur->string, cur->tag, 0);
			if (!subsym) {
				struct string_list *n;

				error_with_pos("expand undefined %s %s",
					       symbol_types[cur->tag].name,
					       cur->string);
				n = concat_list(mk_node
						(symbol_types[cur->tag].name),
						mk_node(cur->string),
						mk_node("{"),
						mk_node("UNKNOWN"),
						mk_node("}"), NULL);
				subsym =
				    add_symbol(cur->string, cur->tag, n, 0);
			}
			if (subsym->expansion_trail) {
				if (flag_dump_defs) {
					fprintf(debugfile, "%s %s ",
						symbol_types[cur->tag].name,
						cur->string);
				}

				crc = partial_crc32(symbol_types[cur->tag].name,
						    crc);
				crc = partial_crc32_one(' ', crc);
				crc = partial_crc32(cur->string, crc);
				crc = partial_crc32_one(' ', crc);
			} else {
				subsym->expansion_trail = expansion_trail;
				expansion_trail = subsym;
				crc = expand_and_crc_sym(subsym, crc);
			}
			break;
		}
	}

	{
		static struct symbol **end = &visited_symbols;

		if (!sym->visited) {
			*end = sym;
			end = &sym->visited;
			sym->visited = (struct symbol *)-1L;
		}
	}

	return crc;
}

void export_symbol(const char *name)
{
	struct symbol *sym;

	sym = find_symbol(name, SYM_NORMAL, 0);
	if (!sym)
		error_with_pos("export undefined symbol %s", name);
	else {
		unsigned long crc;
		int has_changed = 0;

		if (flag_dump_defs)
			fprintf(debugfile, "Export %s == <", name);

		expansion_trail = (struct symbol *)-1L;

		sym->expansion_trail = expansion_trail;
		expansion_trail = sym;
		crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;

		sym = expansion_trail;
		while (sym != (struct symbol *)-1L) {
			struct symbol *n = sym->expansion_trail;

			if (sym->status != STATUS_UNCHANGED) {
				if (!has_changed) {
					print_location();
					fprintf(stderr, "%s: %s: modversion "
						"changed because of changes "
						"in ", flag_preserve ? "error" :
						       "warning", name);
				} else
					fprintf(stderr, ", ");
				print_type_name(sym->type, sym->name);
				if (sym->status == STATUS_DEFINED)
					fprintf(stderr, " (became defined)");
				has_changed = 1;
				if (flag_preserve)
					errors++;
			}
			sym->expansion_trail = 0;
			sym = n;
		}
		if (has_changed)
			fprintf(stderr, "\n");

		if (flag_dump_defs)
			fputs(">\n", debugfile);

		/* Used as a linker script. */
		printf("%s__crc_%s = 0x%08lx ;\n", mod_prefix, name, crc);
	}
}

/*----------------------------------------------------------------------*/

static void print_location(void)
{
	fprintf(stderr, "%s:%d: ", cur_filename ? : "<stdin>", cur_line);
}

static void print_type_name(enum symbol_type type, const char *name)
{
	if (symbol_types[type].name)
		fprintf(stderr, "%s %s", symbol_types[type].name, name);
	else
		fprintf(stderr, "%s", name);
}

void error_with_pos(const char *fmt, ...)
{
	va_list args;

	if (flag_warnings) {
		print_location();

		va_start(args, fmt);
		vfprintf(stderr, fmt, args);
		va_end(args);
		putc('\n', stderr);

		errors++;
	}
}

static void genksyms_usage(void)
{
	fputs("Usage:\n" "genksyms [-adDTwqhV] > /path/to/.tmp_obj.ver\n" "\n"
#ifdef __GNU_LIBRARY__
	      "  -a, --arch            Select architecture\n"
	      "  -d, --debug           Increment the debug level (repeatable)\n"
	      "  -D, --dump            Dump expanded symbol defs (for debugging only)\n"
	      "  -r, --reference file  Read reference symbols from a file\n"
	      "  -T, --dump-types file Dump expanded types into file\n"
	      "  -p, --preserve        Preserve reference modversions or fail\n"
	      "  -w, --warnings        Enable warnings\n"
	      "  -q, --quiet           Disable warnings (default)\n"
	      "  -h, --help            Print this message\n"
	      "  -V, --version         Print the release version\n"
#else				/* __GNU_LIBRARY__ */
	      "  -a                    Select architecture\n"
	      "  -d                    Increment the debug level (repeatable)\n"
	      "  -D                    Dump expanded symbol defs (for debugging only)\n"
	      "  -r file               Read reference symbols from a file\n"
	      "  -T file               Dump expanded types into file\n"
	      "  -p                    Preserve reference modversions or fail\n"
	      "  -w                    Enable warnings\n"
	      "  -q                    Disable warnings (default)\n"
	      "  -h                    Print this message\n"
	      "  -V                    Print the release version\n"
#endif				/* __GNU_LIBRARY__ */
	      , stderr);
}

int main(int argc, char **argv)
{
	FILE *dumpfile = NULL, *ref_file = NULL;
	int o;

#ifdef __GNU_LIBRARY__
	struct option long_opts[] = {
		{"arch", 1, 0, 'a'},
		{"debug", 0, 0, 'd'},
		{"warnings", 0, 0, 'w'},
		{"quiet", 0, 0, 'q'},
		{"dump", 0, 0, 'D'},
		{"reference", 1, 0, 'r'},
		{"dump-types", 1, 0, 'T'},
		{"preserve", 0, 0, 'p'},
		{"version", 0, 0, 'V'},
		{"help", 0, 0, 'h'},
		{0, 0, 0, 0}
	};

	while ((o = getopt_long(argc, argv, "a:dwqVDr:T:ph",
				&long_opts[0], NULL)) != EOF)
#else				/* __GNU_LIBRARY__ */
	while ((o = getopt(argc, argv, "a:dwqVDr:T:ph")) != EOF)
#endif				/* __GNU_LIBRARY__ */
		switch (o) {
		case 'a':
			arch = optarg;
			break;
		case 'd':
			flag_debug++;
			break;
		case 'w':
			flag_warnings = 1;
			break;
		case 'q':
			flag_warnings = 0;
			break;
		case 'V':
			fputs("genksyms version 2.5.60\n", stderr);
			break;
		case 'D':
			flag_dump_defs = 1;
			break;
		case 'r':
			flag_reference = 1;
			ref_file = fopen(optarg, "r");
			if (!ref_file) {
				perror(optarg);
				return 1;
			}
			break;
		case 'T':
			flag_dump_types = 1;
			dumpfile = fopen(optarg, "w");
			if (!dumpfile) {
				perror(optarg);
				return 1;
			}
			break;
		case 'p':
			flag_preserve = 1;
			break;
		case 'h':
			genksyms_usage();
			return 0;
		default:
			genksyms_usage();
			return 1;
		}
	if ((strcmp(arch, "h8300") == 0) || (strcmp(arch, "blackfin") == 0))
		mod_prefix = "_";
	{
		extern int yydebug;
		extern int yy_flex_debug;

		yydebug = (flag_debug > 1);
		yy_flex_debug = (flag_debug > 2);

		debugfile = stderr;
		/* setlinebuf(debugfile); */
	}

	if (flag_reference) {
		read_reference(ref_file);
		fclose(ref_file);
	}

	yyparse();

	if (flag_dump_types && visited_symbols) {
		while (visited_symbols != (struct symbol *)-1L) {
			struct symbol *sym = visited_symbols;

			if (sym->is_override)
				fputs("override ", dumpfile);
			if (symbol_types[sym->type].n) {
				putc(symbol_types[sym->type].n, dumpfile);
				putc('#', dumpfile);
			}
			fputs(sym->name, dumpfile);
			putc(' ', dumpfile);
			if (sym->is_extern)
				fputs("extern ", dumpfile);
			print_list(dumpfile, sym->defn);
			putc('\n', dumpfile);

			visited_symbols = sym->visited;
			sym->visited = NULL;
		}
	}

	if (flag_debug) {
		fprintf(debugfile, "Hash table occupancy %d/%d = %g\n",
			nsyms, HASH_BUCKETS,
			(double)nsyms / (double)HASH_BUCKETS);
	}

	return errors != 0;
}