aboutsummaryrefslogtreecommitdiff
path: root/binutils/coffgrok.c
blob: 74e6a7b68a778caac52d3045bbdbcb38ea573716 (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
/* coffgrok.c
   Copyright (C) 1994-2020 Free Software Foundation, Inc.

   This file is part of GNU Binutils.

   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */


/* Written by Steve Chamberlain (sac@cygnus.com)

   This module reads a coff file and builds a really simple type tree
   which can be read by other programs.  The first application is a
   coff->sysroff converter.  It can be tested with coffdump.c.  */

#include "sysdep.h"
#include "bfd.h"
#include "libiberty.h"
#include "coff/internal.h"
#include "../bfd/libcoff.h"
#include "bucomm.h"
#include "coffgrok.h"

static int                      lofile = 1;

static struct coff_scope *      top_scope;
static struct coff_scope *      file_scope;
static struct coff_ofile *      ofile;
static struct coff_symbol *     last_function_symbol;
static struct coff_type *       last_function_type;
static struct coff_type *       last_struct;
static struct coff_type *       last_enum;
static struct coff_sfile *      cur_sfile;
static struct coff_symbol **    tindex;
static asymbol **               syms;
static long                     symcount;
static struct coff_ptr_struct * rawsyms;
static unsigned int             rawcount;
static bfd *                    abfd;

#define N(x) ((x)->_n._n_nptr[1])

#define PTR_SIZE	4
#define SHORT_SIZE	2
#define INT_SIZE	4
#define LONG_SIZE	4
#define FLOAT_SIZE	4
#define DOUBLE_SIZE	8

#define INDEXOF(p)  ((struct coff_ptr_struct *)(p)-(rawsyms))


static struct coff_scope *
empty_scope (void)
{
  return (struct coff_scope *) (xcalloc (sizeof (struct coff_scope), 1));
}

static struct coff_symbol *
empty_symbol (void)
{
  return (struct coff_symbol *) (xcalloc (sizeof (struct coff_symbol), 1));
}

static void
push_scope (int slink)
{
  struct coff_scope *n = empty_scope ();

  if (slink)
    {
      if (top_scope)
	{
	  if (top_scope->list_tail)
	    {
	      top_scope->list_tail->next = n;
	    }
	  else
	    {
	      top_scope->list_head = n;
	    }
	  top_scope->list_tail = n;
	}
    }
  n->parent = top_scope;

  top_scope = n;
}

static void
pop_scope (void)
{
  /* PR 17512: file: 809933ac.  */
  if (top_scope == NULL)
    fatal (_("Out of context scope change encountered"));
  top_scope = top_scope->parent;
}

static void
do_sections_p1 (struct coff_ofile *head)
{
  asection *section;
  int idx;
  struct coff_section *all = (struct coff_section *) (xcalloc (abfd->section_count + 1,
					     sizeof (struct coff_section)));
  head->nsections = abfd->section_count + 1;
  head->sections = all;

  for (idx = 0, section = abfd->sections; section; section = section->next, idx++)
    {
      long relsize;
      unsigned int i = section->target_index;
      arelent **relpp;
      long relcount;

      /* PR 17512: file: 2d6effca.  */
      if (i > abfd->section_count)
	fatal (_("Invalid section target index: %u"), i);

      relsize = bfd_get_reloc_upper_bound (abfd, section);
      if (relsize < 0)
	bfd_fatal (bfd_get_filename (abfd));
      if (relsize == 0)
	continue;
      relpp = (arelent **) xmalloc (relsize);
      relcount = bfd_canonicalize_reloc (abfd, section, relpp, syms);
      if (relcount < 0)
	bfd_fatal (bfd_get_filename (abfd));

      head->sections[i].name = (char *) (section->name);
      head->sections[i].code = section->flags & SEC_CODE;
      head->sections[i].data = section->flags & SEC_DATA;
      if (strcmp (section->name, ".bss") == 0)
	head->sections[i].data = 1;
      head->sections[i].address = section->lma;
      head->sections[i].size = bfd_section_size (section);
      head->sections[i].number = idx;
      head->sections[i].nrelocs = section->reloc_count;
      head->sections[i].relocs =
	(struct coff_reloc *) (xcalloc (section->reloc_count,
					sizeof (struct coff_reloc)));
      head->sections[i].bfd_section = section;
    }
  head->sections[0].name = "ABSOLUTE";
  head->sections[0].code = 0;
  head->sections[0].data = 0;
  head->sections[0].address = 0;
  head->sections[0].size = 0;
  head->sections[0].number = 0;
}

static void
do_sections_p2 (struct coff_ofile *head)
{
  asection *section;

  for (section = abfd->sections; section; section = section->next)
    {
      unsigned int j;

      /* PR 17512: file: 7c1a36e8.
	 A corrupt COFF binary might have a reloc count but no relocs.
	 Handle this here.  */
      if (section->relocation == NULL)
	continue;

      for (j = 0; j < section->reloc_count; j++)
	{
	  unsigned int idx;
	  int i = section->target_index;
	  struct coff_reloc *r;
	  arelent *sr = section->relocation + j;

	  if (i > head->nsections)
	    fatal (_("Invalid section target index: %d"), i);
	  /* PR 17512: file: db850ff4.  */
	  if (j >= head->sections[i].nrelocs)
	    fatal (_("Target section has insufficient relocs"));
	  r = head->sections[i].relocs + j;
	  r->offset = sr->address;
	  r->addend = sr->addend;
	  idx = ((coff_symbol_type *) (sr->sym_ptr_ptr[0]))->native - rawsyms;
	  if (idx >= rawcount)
	    {
	      if (rawcount == 0)
		fatal (_("Symbol index %u encountered when there are no symbols"), idx);
	      non_fatal (_("Invalid symbol index %u encountered"), idx);
	      idx = 0;
	    }
	  r->symbol = tindex[idx];
	}
    }
}

static struct coff_where *
do_where (unsigned int i)
{
  struct internal_syment *sym;
  struct coff_where *where =
    (struct coff_where *) (xmalloc (sizeof (struct coff_where)));

  if (i >= rawcount)
    fatal ("Invalid symbol index: %d\n", i);

  sym = &rawsyms[i].u.syment;
  where->offset = sym->n_value;

  if (sym->n_scnum == -1)
    sym->n_scnum = 0;

  switch (sym->n_sclass)
    {
    case C_FIELD:
      where->where = coff_where_member_of_struct;
      where->offset = sym->n_value / 8;
      where->bitoffset = sym->n_value % 8;
      where->bitsize = rawsyms[i + 1].u.auxent.x_sym.x_misc.x_lnsz.x_size;
      break;
    case C_MOE:
      where->where = coff_where_member_of_enum;
      break;
    case C_MOS:
    case C_MOU:
      where->where = coff_where_member_of_struct;
      break;
    case C_AUTO:
    case C_ARG:
      where->where = coff_where_stack;
      break;
    case C_EXT:
    case C_STAT:
    case C_EXTDEF:
    case C_LABEL:
      where->where = coff_where_memory;
      /* PR 17512: file: 07a37c40.  */
      /* PR 17512: file: 0c2eb101.  */
      if (sym->n_scnum >= ofile->nsections || sym->n_scnum < 0)
	{
	  non_fatal (_("Invalid section number (%d) encountered"),
		     sym->n_scnum);
	  where->section = ofile->sections;
	}
      else
	where->section = &ofile->sections[sym->n_scnum];
      break;
    case C_REG:
    case C_REGPARM:
      where->where = coff_where_register;
      break;
    case C_ENTAG:
      where->where = coff_where_entag;
      break;
    case C_STRTAG:
    case C_UNTAG:
      where->where = coff_where_strtag;
      break;
    case C_TPDEF:
      where->where = coff_where_typedef;
      break;
    default:
      fatal (_("Unrecognized symbol class: %d"), sym->n_sclass);
      break;
    }
  return where;
}

static struct coff_line *
do_lines (int i, char *name ATTRIBUTE_UNUSED)
{
  struct coff_line *res = (struct coff_line *) xcalloc (sizeof (struct coff_line), 1);
  asection *s;
  unsigned int l;

  /* Find out if this function has any line numbers in the table.  */
  for (s = abfd->sections; s; s = s->next)
    {
      /* PR 17512: file: 07a37c40.
	 A corrupt COFF binary can have a linenumber count in the header
	 but no line number table.  This should be reported elsewhere, but
	 do not rely upon this.  */
      if (s->lineno == NULL)
	continue;

      for (l = 0; l < s->lineno_count; l++)
	{
	  if (s->lineno[l].line_number == 0)
	    {
	      if (rawsyms + i == ((coff_symbol_type *) (&(s->lineno[l].u.sym[0])))->native)
		{
		  /* These lines are for this function - so count them and stick them on.  */
		  int c = 0;
		  /* Find the linenumber of the top of the function, since coff linenumbers
		     are relative to the start of the function.  */
		  int start_line = rawsyms[i + 3].u.auxent.x_sym.x_misc.x_lnsz.x_lnno;

		  l++;
		  for (c = 0;
		       /* PR 17512: file: c2825452.  */
		       l + c + 1 < s->lineno_count
			 && s->lineno[l + c + 1].line_number;
		       c++)
		    ;

		  /* Add two extra records, one for the prologue and one for the epilogue.  */
		  c += 1;
		  res->nlines = c;
		  res->lines = (int *) (xcalloc (sizeof (int), c));
		  res->addresses = (int *) (xcalloc (sizeof (int), c));
		  res->lines[0] = start_line;
		  res->addresses[0] = rawsyms[i].u.syment.n_value - s->vma;
		  for (c = 0;
		       /* PR 17512: file: c2825452.  */
		       l + c + 1 < s->lineno_count
			 && s->lineno[l + c + 1].line_number;
		       c++)
		    {
		      res->lines[c + 1] = s->lineno[l + c].line_number + start_line - 1;
		      res->addresses[c + 1] = s->lineno[l + c].u.offset;
		    }
		  return res;
		}
	    }
	}
    }
  return res;
}

static struct coff_type *
do_type (unsigned int i)
{
  struct internal_syment *sym;
  union internal_auxent *aux;
  struct coff_type *res = (struct coff_type *) xmalloc (sizeof (struct coff_type));
  int type;
  int which_dt = 0;
  int dimind = 0;

  if (i >= rawcount)
    fatal (_("Type entry %u does not have enough symbolic information"), i);

  if (!rawsyms[i].is_sym)
    fatal (_("Type entry %u does not refer to a symbol"), i);
  sym = &rawsyms[i].u.syment;

  if (sym->n_numaux == 0 || i >= rawcount -1 || rawsyms[i + 1].is_sym)
    aux = NULL;
  else
    aux = &rawsyms[i + 1].u.auxent;

  type = sym->n_type;

  res->type = coff_basic_type;
  res->u.basic = type & 0xf;

  switch (type & 0xf)
    {
    case T_NULL:
    case T_VOID:
      if (sym->n_numaux && sym->n_sclass == C_STAT)
	{
	  /* This is probably a section definition.  */
	  res->type = coff_secdef_type;
	  if (aux == NULL)
	    fatal (_("Section definition needs a section length"));
	  res->size = aux->x_scn.x_scnlen;

	  /* PR 17512: file: 081c955d.
	     Fill in the asecdef structure as well.  */
	  res->u.asecdef.address = 0;
	  res->u.asecdef.size = 0;
	}
      else
	{
	  if (type == 0)
	    {
	      /* Don't know what this is, let's make it a simple int.  */
	      res->size = INT_SIZE;
	      res->u.basic = T_UINT;
	    }
	  else
	    {
	      /* Else it could be a function or pointer to void.  */
	      res->size = 0;
	    }
	}
      break;

    case T_UCHAR:
    case T_CHAR:
      res->size = 1;
      break;
    case T_USHORT:
    case T_SHORT:
      res->size = SHORT_SIZE;
      break;
    case T_UINT:
    case T_INT:
      res->size = INT_SIZE;
      break;
    case T_ULONG:
    case T_LONG:
      res->size = LONG_SIZE;
      break;
    case T_FLOAT:
      res->size = FLOAT_SIZE;
      break;
    case T_DOUBLE:
      res->size = DOUBLE_SIZE;
      break;
    case T_STRUCT:
    case T_UNION:
      if (sym->n_numaux)
	{
	  if (aux == NULL)
	    fatal (_("Aggregate definition needs auxillary information"));

	  if (aux->x_sym.x_tagndx.p)
	    {
	      unsigned int idx;

	      /* PR 17512: file: e72f3988.  */
	      if (aux->x_sym.x_tagndx.l < 0 || aux->x_sym.x_tagndx.p < rawsyms)
		{
		  non_fatal (_("Invalid tag index %#lx encountered"), aux->x_sym.x_tagndx.l);
		  idx = 0;
		}
	      else
		idx = INDEXOF (aux->x_sym.x_tagndx.p);

	      if (idx >= rawcount)
		{
		  if (rawcount == 0)
		    fatal (_("Symbol index %u encountered when there are no symbols"), idx);
		  non_fatal (_("Invalid symbol index %u encountered"), idx);
		  idx = 0;
		}

	      /* Referring to a struct defined elsewhere.  */
	      res->type = coff_structref_type;
	      res->u.astructref.ref = tindex[idx];
	      res->size = res->u.astructref.ref ?
		res->u.astructref.ref->type->size : 0;
	    }
	  else
	    {
	      /* A definition of a struct.  */
	      last_struct = res;
	      res->type = coff_structdef_type;
	      res->u.astructdef.elements = empty_scope ();
	      res->u.astructdef.idx = 0;
	      res->u.astructdef.isstruct = (type & 0xf) == T_STRUCT;
	      res->size = aux->x_sym.x_misc.x_lnsz.x_size;
	    }
	}
      else
	{
	  /* No auxents - it's anonymous.  */
	  res->type = coff_structref_type;
	  res->u.astructref.ref = 0;
	  res->size = 0;
	}
      break;
    case T_ENUM:
      if (aux == NULL)
	fatal (_("Enum definition needs auxillary information"));
      if (aux->x_sym.x_tagndx.p)
	{
	  unsigned int idx = INDEXOF (aux->x_sym.x_tagndx.p);

	  /* PR 17512: file: 1ef037c7.  */
	  if (idx >= rawcount)
	    fatal (_("Invalid enum symbol index %u encountered"), idx);
	  /* Referring to a enum defined elsewhere.  */
	  res->type = coff_enumref_type;
	  res->u.aenumref.ref = tindex[idx];
	  /* PR 17512: file: b85b67e8.  */
	  if (res->u.aenumref.ref)
	    res->size = res->u.aenumref.ref->type->size;
	  else
	    res->size = 0;
	}
      else
	{
	  /* A definition of an enum.  */
	  last_enum = res;
	  res->type = coff_enumdef_type;
	  res->u.aenumdef.elements = empty_scope ();
	  res->size = aux->x_sym.x_misc.x_lnsz.x_size;
	}
      break;
    case T_MOE:
      break;
    }

  for (which_dt = 5; which_dt >= 0; which_dt--)
    {
      switch ((type >> ((which_dt * 2) + 4)) & 0x3)
	{
	case 0:
	  break;
	case DT_ARY:
	  {
	    struct coff_type *ptr = ((struct coff_type *)
				     xmalloc (sizeof (struct coff_type)));
	    int els;

	    if (aux == NULL)
	      fatal (_("Array definition needs auxillary information"));
	    els = (dimind < DIMNUM
		   ? aux->x_sym.x_fcnary.x_ary.x_dimen[dimind]
		   : 0);

	    ++dimind;
	    ptr->type = coff_array_type;
	    /* PR 17512: file: ae1971e2.
	       Check for integer overflow.  */
	    {
	      long long a, z;
	      a = els;
	      z = res->size;
	      a *= z;
	      ptr->size = (int) a;
	      if (ptr->size != a)
		non_fatal (_("Out of range sum for els (%#x) * size (%#x)"), els, res->size);
	    }
	    ptr->u.array.dim = els;
	    ptr->u.array.array_of = res;
	    res = ptr;
	    break;
	  }
	case DT_PTR:
	  {
	    struct coff_type *ptr =
	      (struct coff_type *) xmalloc (sizeof (struct coff_type));

	    ptr->size = PTR_SIZE;
	    ptr->type = coff_pointer_type;
	    ptr->u.pointer.points_to = res;
	    res = ptr;
	    break;
	  }
	case DT_FCN:
	  {
	    struct coff_type *ptr
	      = (struct coff_type *) xmalloc (sizeof (struct coff_type));

	    ptr->size = 0;
	    ptr->type = coff_function_type;
	    ptr->u.function.function_returns = res;
	    ptr->u.function.parameters = empty_scope ();
	    ptr->u.function.lines = do_lines (i, N(sym));
	    ptr->u.function.code = 0;
	    last_function_type = ptr;
	    res = ptr;
	    break;
	  }
	}
    }
  return res;
}

static struct coff_visible *
do_visible (int i)
{
  struct internal_syment *sym = &rawsyms[i].u.syment;
  struct coff_visible *visible =
    (struct coff_visible *) (xmalloc (sizeof (struct coff_visible)));
  enum coff_vis_type t;

  switch (sym->n_sclass)
    {
    case C_MOS:
    case C_MOU:
    case C_FIELD:
      t = coff_vis_member_of_struct;
      break;
    case C_MOE:
      t = coff_vis_member_of_enum;
      break;
    case C_REGPARM:
      t = coff_vis_regparam;
      break;
    case C_REG:
      t = coff_vis_register;
      break;
    case C_STRTAG:
    case C_UNTAG:
    case C_ENTAG:
    case C_TPDEF:
      t = coff_vis_tag;
      break;
    case C_AUTOARG:
    case C_ARG:
      t = coff_vis_autoparam;
      break;
    case C_AUTO:
      t = coff_vis_auto;
      break;
    case C_LABEL:
    case C_STAT:
      t = coff_vis_int_def;
      break;
    case C_EXT:
      if (sym->n_scnum == N_UNDEF)
	{
	  if (sym->n_value)
	    t = coff_vis_common;
	  else
	    t = coff_vis_ext_ref;
	}
      else
	t = coff_vis_ext_def;
      break;
    default:
      fatal (_("Unrecognised symbol class: %d"), sym->n_sclass);
      break;
    }
  visible->type = t;
  return visible;
}

/* Define a symbol and attach to block B.  */

static int
do_define (unsigned int i, struct coff_scope *b)
{
  static int symbol_index;
  struct internal_syment *sym;
  struct coff_symbol *s = empty_symbol ();

  if (b == NULL)
    fatal (_("ICE: do_define called without a block"));
  if (i >= rawcount)
    fatal (_("Out of range symbol index: %u"), i);

  sym = &rawsyms[i].u.syment;
  s->number = ++symbol_index;
  s->name = N(sym);
  s->sfile = cur_sfile;
  /* Glue onto the ofile list.  */
  if (lofile >= 0)
    {
      if (ofile->symbol_list_tail)
	ofile->symbol_list_tail->next_in_ofile_list = s;
      else
	ofile->symbol_list_head = s;
      ofile->symbol_list_tail = s;
      /* And the block list.  */
    }
  if (b->vars_tail)
    b->vars_tail->next = s;
  else
    b->vars_head = s;

  b->vars_tail = s;
  b->nvars++;
  s->type = do_type (i);
  s->where = do_where (i);
  s->visible = do_visible (i);

  tindex[i] = s;

  /* We remember the lowest address in each section for each source file.  */
  if (s->where->where == coff_where_memory
      && s->type->type == coff_secdef_type)
    {
      struct coff_isection *is;

      /* PR 17512: file: 4676c97f.  */
      if (cur_sfile == NULL)
	non_fatal (_("Section referenced before any file is defined"));
      else
	{
	  is = cur_sfile->section + s->where->section->number;

	  if (!is->init)
	    {
	      is->low = s->where->offset;
	      /* PR 17512: file: 37e7a80d.
		 Check for integer overflow computing low + size.  */
	      {
		long long a, z;

		a = s->where->offset;
		z = s->type->size;
		a += z;
		is->high = (int) a;
		if (a != is->high)
		  non_fatal (_("Out of range sum for offset (%#x) + size (%#x)"),
			     is->low, s->type->size);
	      }
	      /* PR 17512: file: 37e7a80d.  */
	      if (is->high < s->where->offset)
		fatal (_("Out of range type size: %u"), s->type->size);
	      is->init = 1;
	      is->parent = s->where->section;
	    }
	}
    }

  if (s->type->type == coff_function_type)
    last_function_symbol = s;

  return i + sym->n_numaux + 1;
}

static struct coff_ofile *
doit (void)
{
  unsigned int i;
  bfd_boolean infile = FALSE;
  struct coff_ofile *head =
    (struct coff_ofile *) xmalloc (sizeof (struct coff_ofile));

  ofile = head;
  head->source_head = 0;
  head->source_tail = 0;
  head->nsources = 0;
  head->symbol_list_tail = 0;
  head->symbol_list_head = 0;
  do_sections_p1 (head);
  push_scope (1);

  for (i = 0; i < rawcount;)
    {
      struct internal_syment *sym = &rawsyms[i].u.syment;

      switch (sym->n_sclass)
	{
	case C_FILE:
	  {
	    /* New source file announced.  */
	    struct coff_sfile *n =
	      (struct coff_sfile *) xmalloc (sizeof (struct coff_sfile));

	    n->section = (struct coff_isection *) xcalloc (sizeof (struct coff_isection), abfd->section_count + 1);
	    cur_sfile = n;
	    n->name = N(sym);
	    n->next = 0;

	    if (infile)
	      pop_scope ();
	    else
	      infile = TRUE;

	    push_scope (1);
	    file_scope = n->scope = top_scope;

	    if (head->source_tail)
	      head->source_tail->next = n;
	    else
	      head->source_head = n;
	    head->source_tail = n;
	    head->nsources++;
	    i += sym->n_numaux + 1;
	  }
	  break;
	case C_FCN:
	  {
	    char *name = N(sym);

	    if (name[1] == 'b')
	      {
		/* Function start.  */
		push_scope (0);
		/* PR 17512: file: 0ef7fbaf.  */
		if (last_function_type)
		  last_function_type->u.function.code = top_scope;
		/* PR 17512: file: 22908266.  */
		if (sym->n_scnum < ofile->nsections && sym->n_scnum >= 0)
		  top_scope->sec = ofile->sections + sym->n_scnum;
		else
		  top_scope->sec = NULL;
		top_scope->offset = sym->n_value;
	      }
	    else
	      {
		/* PR 17512: file: e92e42e1.  */
		if (top_scope == NULL)
		  fatal (_("Function start encountered without a top level scope."));
		top_scope->size = sym->n_value - top_scope->offset + 1;
		pop_scope ();
	      }
	    i += sym->n_numaux + 1;
	  }
	  break;

	case C_BLOCK:
	  {
	    char *name = N(sym);

	    if (name[1] == 'b')
	      {
		/* Block start.  */
		push_scope (1);
		/* PR 17512: file: af7e8e83.  */
		if (sym->n_scnum < ofile->nsections && sym->n_scnum >= 0)
		  top_scope->sec = ofile->sections + sym->n_scnum;
		else
		  top_scope->sec = NULL;
		top_scope->offset = sym->n_value;
	      }
	    else
	      {
		if (top_scope == NULL)
		  fatal (_("Block start encountered without a scope for it."));
		top_scope->size = sym->n_value - top_scope->offset + 1;
		pop_scope ();
	      }
	    i += sym->n_numaux + 1;
	  }
	  break;
	case C_REGPARM:
	case C_ARG:
	  if (last_function_symbol == NULL)
	    fatal (_("Function arguments encountered without a function definition"));
	  i = do_define (i, last_function_symbol->type->u.function.parameters);
	  break;
	case C_MOS:
	case C_MOU:
	case C_FIELD:
	  /* PR 17512: file: 43ab21f4.  */
	  if (last_struct == NULL)
	    fatal (_("Structure element encountered without a structure definition"));
	  i = do_define (i, last_struct->u.astructdef.elements);
	  break;
	case C_MOE:
	  if (last_enum == NULL)
	    fatal (_("Enum element encountered without an enum definition"));
	  i = do_define (i, last_enum->u.aenumdef.elements);
	  break;
	case C_STRTAG:
	case C_ENTAG:
	case C_UNTAG:
	  /* Various definition.  */
	  if (top_scope == NULL)
	    fatal (_("Aggregate definition encountered without a scope"));
	  i = do_define (i, top_scope);
	  break;
	case C_EXT:
	case C_LABEL:
	  if (file_scope == NULL)
	    fatal (_("Label definition encountered without a file scope"));
	  i = do_define (i, file_scope);
	  break;
	case C_STAT:
	case C_TPDEF:
	case C_AUTO:
	case C_REG:
	  if (top_scope == NULL)
	    fatal (_("Variable definition encountered without a scope"));
	  i = do_define (i, top_scope);
	  break;
	case C_EOS:
	  i += sym->n_numaux + 1;
	  break;
	default:
	  fatal (_("Unrecognised symbol class: %d"), sym->n_sclass);
	}
    }
  do_sections_p2 (head);
  return head;
}

struct coff_ofile *
coff_grok (bfd *inabfd)
{
  long storage;
  struct coff_ofile *p;
  abfd = inabfd;

  if (! bfd_family_coff (abfd))
    {
      non_fatal (_("%s: is not a COFF format file"), bfd_get_filename (abfd));
      return NULL;
    }

  storage = bfd_get_symtab_upper_bound (abfd);

  if (storage < 0)
    bfd_fatal (abfd->filename);

  syms = (asymbol **) xmalloc (storage);
  symcount = bfd_canonicalize_symtab (abfd, syms);
  if (symcount < 0)
    bfd_fatal (abfd->filename);
  rawsyms = obj_raw_syments (abfd);
  rawcount = obj_raw_syment_count (abfd);
  tindex = (struct coff_symbol **) (xcalloc (sizeof (struct coff_symbol *), rawcount));

  p = doit ();
  return p;
}