summaryrefslogtreecommitdiff
path: root/gdb/machoread.c
blob: fb4e205088a447d48f69485f22e349b63d3914bf (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
/* Darwin support for GDB, the GNU debugger.
   Copyright (C) 2008-2020 Free Software Foundation, Inc.

   Contributed by AdaCore.

   This file is part of GDB.

   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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbcmd.h"
#include "gdbcore.h"
#include "mach-o.h"
#include "aout/stab_gnu.h"
#include "complaints.h"
#include "gdb_bfd.h"
#include <string>
#include <algorithm>

/* If non-zero displays debugging message.  */
static unsigned int mach_o_debug_level = 0;

/* Dwarf debugging information are never in the final executable.  They stay
   in object files and the executable contains the list of object files read
   during the link.
   Each time an oso (other source) is found in the executable, the reader
   creates such a structure.  They are read after the processing of the
   executable.  */

struct oso_el
{
  oso_el (asymbol **oso_sym_, asymbol **end_sym_, unsigned int nbr_syms_)
    : name((*oso_sym_)->name),
      mtime((*oso_sym_)->value),
      oso_sym(oso_sym_),
      end_sym(end_sym_),
      nbr_syms(nbr_syms_)
  {
  }

  /* Object file name.  Can also be a member name.  */
  const char *name;

  /* Associated time stamp.  */
  unsigned long mtime;

  /* Stab symbols range for this OSO.  */
  asymbol **oso_sym;
  asymbol **end_sym;

  /* Number of interesting stabs in the range.  */
  unsigned int nbr_syms;
};

static void
macho_new_init (struct objfile *objfile)
{
}

static void
macho_symfile_init (struct objfile *objfile)
{
  objfile->flags |= OBJF_REORDERED;
}

/* Add symbol SYM to the minimal symbol table of OBJFILE.  */

static void
macho_symtab_add_minsym (minimal_symbol_reader &reader,
			 struct objfile *objfile, const asymbol *sym)
{
  if (sym->name == NULL || *sym->name == '\0')
    {
      /* Skip names that don't exist (shouldn't happen), or names
         that are null strings (may happen).  */
      return;
    }

  if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
    {
      CORE_ADDR symaddr;
      enum minimal_symbol_type ms_type;

      /* Bfd symbols are section relative.  */
      symaddr = sym->value + sym->section->vma;

      if (sym->section == bfd_abs_section_ptr)
        ms_type = mst_abs;
      else if (sym->section->flags & SEC_CODE)
        {
          if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
            ms_type = mst_text;
          else
            ms_type = mst_file_text;
        }
      else if (sym->section->flags & SEC_ALLOC)
        {
          if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
            {
              if (sym->section->flags & SEC_LOAD)
                ms_type = mst_data;
              else
                ms_type = mst_bss;
            }
          else if (sym->flags & BSF_LOCAL)
            {
              /* Not a special stabs-in-elf symbol, do regular
                 symbol processing.  */
              if (sym->section->flags & SEC_LOAD)
                ms_type = mst_file_data;
              else
                ms_type = mst_file_bss;
            }
          else
            ms_type = mst_unknown;
        }
      else
        return;	/* Skip this symbol.  */

      reader.record_with_info (sym->name, symaddr, ms_type,
			       gdb_bfd_section_index (objfile->obfd,
						      sym->section));
    }
}

/* Build the minimal symbol table from SYMBOL_TABLE of length
   NUMBER_OF_SYMBOLS for OBJFILE.  Registers OSO filenames found.  */

static void
macho_symtab_read (minimal_symbol_reader &reader,
		   struct objfile *objfile,
		   long number_of_symbols, asymbol **symbol_table,
		   std::vector<oso_el> *oso_vector_ptr)
{
  long i;
  const asymbol *file_so = NULL;
  asymbol **oso_file = NULL;
  unsigned int nbr_syms = 0;

  /* Current state while reading stabs.  */
  enum
  {
    /* Not within an SO part.  Only non-debugging symbols should be present,
       and will be added to the minimal symbols table.  */
    S_NO_SO,

    /* First SO read.  Introduce an SO section, and may be followed by a second
       SO.  The SO section should contain onl debugging symbols.  */
    S_FIRST_SO,

    /* Second non-null SO found, just after the first one.  Means that the first
       is in fact a directory name.  */
    S_SECOND_SO,

    /* Non-null OSO found.  Debugging info are DWARF in this OSO file.  */
    S_DWARF_FILE,

    S_STAB_FILE
  } state = S_NO_SO;

  for (i = 0; i < number_of_symbols; i++)
    {
      const asymbol *sym = symbol_table[i];
      bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym;

      switch (state)
        {
        case S_NO_SO:
	  if (mach_o_sym->n_type == N_SO)
            {
              /* Start of object stab.  */
	      if (sym->name == NULL || sym->name[0] == 0)
                {
                  /* Unexpected empty N_SO.  */
                  complaint (_("Unexpected empty N_SO stab"));
                }
              else
                {
                  file_so = sym;
                  state = S_FIRST_SO;
                }
            }
          else if (sym->flags & BSF_DEBUGGING)
            {
              if (mach_o_sym->n_type == N_OPT)
                {
                  /* No complaint for OPT.  */
                  break;
                }

              /* Debugging symbols are not expected here.  */
              complaint (_("%s: Unexpected debug stab outside SO markers"),
                         objfile_name (objfile));
            }
          else
            {
              /* Non-debugging symbols go to the minimal symbol table.  */
              macho_symtab_add_minsym (reader, objfile, sym);
            }
          break;

        case S_FIRST_SO:
        case S_SECOND_SO:
	  if (mach_o_sym->n_type == N_SO)
            {
	      if (sym->name == NULL || sym->name[0] == 0)
                {
                  /* Unexpected empty N_SO.  */
                  complaint (_("Empty SO section"));
                  state = S_NO_SO;
                }
              else if (state == S_FIRST_SO)
                {
                  /* Second SO stab for the file name.  */
                  file_so = sym;
                  state = S_SECOND_SO;
                }
              else
                complaint (_("Three SO in a raw"));
            }
          else if (mach_o_sym->n_type == N_OSO)
            {
	      if (sym->name == NULL || sym->name[0] == 0)
                {
                  /* Empty OSO.  Means that this file was compiled with
                     stabs.  */
                  state = S_STAB_FILE;
                  warning (_("stabs debugging not supported for %s"),
                           file_so->name);
                }
              else
                {
                  /* Non-empty OSO for a Dwarf file.  */
                  oso_file = symbol_table + i;
                  nbr_syms = 0;
                  state = S_DWARF_FILE;
                }
            }
          else
            complaint (_("Unexpected stab after SO"));
          break;

        case S_STAB_FILE:
        case S_DWARF_FILE:
	  if (mach_o_sym->n_type == N_SO)
            {
	      if (sym->name == NULL || sym->name[0] == 0)
                {
                  /* End of file.  */
                  if (state == S_DWARF_FILE)
		    oso_vector_ptr->emplace_back (oso_file, symbol_table + i,
						  nbr_syms);
                  state = S_NO_SO;
                }
              else
                {
                  complaint (_("Missing nul SO"));
                  file_so = sym;
                  state = S_FIRST_SO;
                }
            }
          else if (sym->flags & BSF_DEBUGGING)
            {
              if (state == S_STAB_FILE)
                {
                  /* FIXME: to be implemented.  */
                }
              else
                {
                  switch (mach_o_sym->n_type)
                    {
                    case N_FUN:
                      if (sym->name == NULL || sym->name[0] == 0)
                        break;
                      /* Fall through.  */
                    case N_STSYM:
                      /* Interesting symbol.  */
                      nbr_syms++;
                      break;
                    case N_ENSYM:
                    case N_BNSYM:
                    case N_GSYM:
                      break;
                    default:
                      complaint (_("unhandled stab for dwarf OSO file"));
                      break;
                    }
                }
            }
          else
            complaint (_("non-debugging symbol within SO"));
          break;
        }
    }

  if (state != S_NO_SO)
    complaint (_("missing nul SO"));
}

/* If NAME describes an archive member (ie: ARCHIVE '(' MEMBER ')'),
   returns the length of the archive name.
   Returns -1 otherwise.  */

static int
get_archive_prefix_len (const char *name)
{
  const char *lparen;
  int name_len = strlen (name);

  if (name_len == 0 || name[name_len - 1] != ')')
    return -1;

  lparen = strrchr (name, '(');
  if (lparen == NULL || lparen == name)
    return -1;
  return lparen - name;
}

/* Compare function to std::sort OSOs, so that members of a library
   are gathered.  */

static bool
oso_el_compare_name (const oso_el &l, const oso_el &r)
{
  return strcmp (l.name, r.name) < 0;
}

/* Hash table entry structure for the stabs symbols in the main object file.
   This is used to speed up lookup for symbols in the OSO.  */

struct macho_sym_hash_entry
{
  struct bfd_hash_entry base;
  const asymbol *sym;
};

/* Routine to create an entry in the hash table.  */

static struct bfd_hash_entry *
macho_sym_hash_newfunc (struct bfd_hash_entry *entry,
                        struct bfd_hash_table *table,
                        const char *string)
{
  struct macho_sym_hash_entry *ret = (struct macho_sym_hash_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (ret == NULL)
    ret = (struct macho_sym_hash_entry *) bfd_hash_allocate (table,
                                                             sizeof (* ret));
  if (ret == NULL)
    return NULL;

  /* Call the allocation method of the superclass.  */
  ret = (struct macho_sym_hash_entry *)
	 bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string);

  if (ret)
    {
      /* Initialize the local fields.  */
      ret->sym = NULL;
    }

  return (struct bfd_hash_entry *) ret;
}

/* Get the value of SYM from the minimal symtab of MAIN_OBJFILE.  This is used
   to get the value of global and common symbols.  */

static CORE_ADDR
macho_resolve_oso_sym_with_minsym (struct objfile *main_objfile, asymbol *sym)
{
  /* For common symbol and global symbols, use the min symtab.  */
  struct bound_minimal_symbol msym;
  const char *name = sym->name;

  if (name[0] == bfd_get_symbol_leading_char (main_objfile->obfd))
    ++name;
  msym = lookup_minimal_symbol (name, NULL, main_objfile);
  if (msym.minsym == NULL)
    {
      warning (_("can't find symbol '%s' in minsymtab"), name);
      return 0;
    }
  else
    return BMSYMBOL_VALUE_ADDRESS (msym);
}

/* Add oso file OSO/ABFD as a symbol file.  */

static void
macho_add_oso_symfile (oso_el *oso, const gdb_bfd_ref_ptr &abfd,
		       const char *name,
                       struct objfile *main_objfile,
		       symfile_add_flags symfile_flags)
{
  int storage;
  int i;
  asymbol **symbol_table;
  asymbol **symp;
  struct bfd_hash_table table;
  int nbr_sections;

  /* Per section flag to mark which section have been rebased.  */
  unsigned char *sections_rebased;

  if (mach_o_debug_level > 0)
    printf_unfiltered
      (_("Loading debugging symbols from oso: %s\n"), oso->name);

  if (!bfd_check_format (abfd.get (), bfd_object))
    {
      warning (_("`%s': can't read symbols: %s."), oso->name,
               bfd_errmsg (bfd_get_error ()));
      return;
    }

  if (abfd->my_archive == NULL && oso->mtime != bfd_get_mtime (abfd.get ()))
    {
      warning (_("`%s': file time stamp mismatch."), oso->name);
      return;
    }

  if (!bfd_hash_table_init_n (&table, macho_sym_hash_newfunc,
                              sizeof (struct macho_sym_hash_entry),
                              oso->nbr_syms))
    {
      warning (_("`%s': can't create hash table"), oso->name);
      return;
    }

  bfd_set_cacheable (abfd.get (), 1);

  /* Read symbols table.  */
  storage = bfd_get_symtab_upper_bound (abfd.get ());
  symbol_table = (asymbol **) xmalloc (storage);
  bfd_canonicalize_symtab (abfd.get (), symbol_table);

  /* Init section flags.  */
  nbr_sections = bfd_count_sections (abfd.get ());
  sections_rebased = (unsigned char *) alloca (nbr_sections);
  for (i = 0; i < nbr_sections; i++)
    sections_rebased[i] = 0;

  /* Put symbols for the OSO file in the hash table.  */
  for (symp = oso->oso_sym; symp != oso->end_sym; symp++)
    {
      const asymbol *sym = *symp;
      bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym;

      switch (mach_o_sym->n_type)
        {
        case N_ENSYM:
        case N_BNSYM:
        case N_GSYM:
          sym = NULL;
          break;
        case N_FUN:
          if (sym->name == NULL || sym->name[0] == 0)
            sym = NULL;
          break;
        case N_STSYM:
          break;
        default:
          sym = NULL;
          break;
        }
      if (sym != NULL)
        {
          struct macho_sym_hash_entry *ent;

          ent = (struct macho_sym_hash_entry *)
            bfd_hash_lookup (&table, sym->name, TRUE, FALSE);
          if (ent->sym != NULL)
            complaint (_("Duplicated symbol %s in symbol table"), sym->name);
          else
            {
              if (mach_o_debug_level > 4)
                {
                  struct gdbarch *arch = main_objfile->arch ();
                  printf_unfiltered
                    (_("Adding symbol %s (addr: %s)\n"),
                     sym->name, paddress (arch, sym->value));
                }
              ent->sym = sym;
            }
        }
    }

  /* Relocate symbols of the OSO.  */
  for (i = 0; symbol_table[i]; i++)
    {
      asymbol *sym = symbol_table[i];
      bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym;

      if (mach_o_sym->n_type & BFD_MACH_O_N_STAB)
        continue;
      if ((mach_o_sym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_UNDF
           && sym->value != 0)
        {
          /* For common symbol use the min symtab and modify the OSO
             symbol table.  */
          CORE_ADDR res;

          res = macho_resolve_oso_sym_with_minsym (main_objfile, sym);
          if (res != 0)
            {
              sym->section = bfd_com_section_ptr;
              sym->value = res;
            }
        }
      else if ((mach_o_sym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_SECT)
        {
          /* Normal symbol.  */
          asection *sec = sym->section;
          bfd_mach_o_section *msec;
          unsigned int sec_type;

          /* Skip buggy ones.  */
          if (sec == NULL || sections_rebased[sec->index] != 0)
            continue;

          /* Only consider regular, non-debugging sections.  */
          msec = bfd_mach_o_get_mach_o_section (sec);
          sec_type = msec->flags & BFD_MACH_O_SECTION_TYPE_MASK;
          if ((sec_type == BFD_MACH_O_S_REGULAR
               || sec_type == BFD_MACH_O_S_ZEROFILL)
              && (msec->flags & BFD_MACH_O_S_ATTR_DEBUG) == 0)
            {
              CORE_ADDR addr = 0;

              if ((mach_o_sym->n_type & BFD_MACH_O_N_EXT) != 0)
                {
                  /* Use the min symtab for global symbols.  */
                  addr = macho_resolve_oso_sym_with_minsym (main_objfile, sym);
                }
              else
                {
                  struct macho_sym_hash_entry *ent;

                  ent = (struct macho_sym_hash_entry *)
                    bfd_hash_lookup (&table, sym->name, FALSE, FALSE);
                  if (ent != NULL)
                    addr = bfd_asymbol_value (ent->sym);
                }

              /* Adjust the section.  */
              if (addr != 0)
                {
                  CORE_ADDR res = addr - sym->value;

                  if (mach_o_debug_level > 3)
                    {
                      struct gdbarch *arch = main_objfile->arch ();
                      printf_unfiltered
                        (_("resolve sect %s with %s (set to %s)\n"),
                         sec->name, sym->name,
                         paddress (arch, res));
                    }
                  bfd_set_section_vma (sec, res);
                  sections_rebased[sec->index] = 1;
                }
            }
          else
            {
              /* Mark the section as never rebased.  */
              sections_rebased[sec->index] = 2;
            }
        }
    }

  bfd_hash_table_free (&table);

  /* We need to clear SYMFILE_MAINLINE to avoid interactive question
     from symfile.c:symbol_file_add_with_addrs_or_offsets.  */
  symbol_file_add_from_bfd
    (abfd.get (), name, symfile_flags & ~(SYMFILE_MAINLINE | SYMFILE_VERBOSE),
     NULL,
     main_objfile->flags & (OBJF_REORDERED | OBJF_SHARED
			    | OBJF_READNOW | OBJF_USERLOADED),
     main_objfile);
}

/* Read symbols from the vector of oso files.

   Note that this function sorts OSO_VECTOR_PTR.  */

static void
macho_symfile_read_all_oso (std::vector<oso_el> *oso_vector_ptr,
			    struct objfile *main_objfile,
			    symfile_add_flags symfile_flags)
{
  int ix;
  oso_el *oso;

  /* Sort oso by name so that files from libraries are gathered.  */
  std::sort (oso_vector_ptr->begin (), oso_vector_ptr->end (),
	     oso_el_compare_name);

  for (ix = 0; ix < oso_vector_ptr->size ();)
    {
      int pfx_len;

      oso = &(*oso_vector_ptr)[ix];

      /* Check if this is a library name.  */
      pfx_len = get_archive_prefix_len (oso->name);
      if (pfx_len > 0)
	{
          int last_ix;
          oso_el *oso2;
          int ix2;

	  std::string archive_name (oso->name, pfx_len);

          /* Compute number of oso for this archive.  */
          for (last_ix = ix; last_ix < oso_vector_ptr->size (); last_ix++)
            {
	      oso2 = &(*oso_vector_ptr)[last_ix];
              if (strncmp (oso2->name, archive_name.c_str (), pfx_len) != 0)
                break;
            }

	  /* Open the archive and check the format.  */
	  gdb_bfd_ref_ptr archive_bfd (gdb_bfd_open (archive_name.c_str (),
						     gnutarget));
	  if (archive_bfd == NULL)
	    {
	      warning (_("Could not open OSO archive file \"%s\""),
		       archive_name.c_str ());
              ix = last_ix;
	      continue;
	    }
	  if (!bfd_check_format (archive_bfd.get (), bfd_archive))
	    {
	      warning (_("OSO archive file \"%s\" not an archive."),
		       archive_name.c_str ());
              ix = last_ix;
	      continue;
	    }

	  gdb_bfd_ref_ptr member_bfd
	    (gdb_bfd_openr_next_archived_file (archive_bfd.get (), NULL));

	  if (member_bfd == NULL)
	    {
	      warning (_("Could not read archive members out of "
			 "OSO archive \"%s\""), archive_name.c_str ());
              ix = last_ix;
	      continue;
	    }

          /* Load all oso in this library.  */
	  while (member_bfd != NULL)
	    {
	      const char *member_name = bfd_get_filename (member_bfd.get ());
              int member_len = strlen (member_name);

              /* If this member is referenced, add it as a symfile.  */
              for (ix2 = ix; ix2 < last_ix; ix2++)
                {
                  oso2 = &(*oso_vector_ptr)[ix2];

                  if (oso2->name
                      && strlen (oso2->name) == pfx_len + member_len + 2
                      && !memcmp (member_name, oso2->name + pfx_len + 1,
                                  member_len))
                    {
                      macho_add_oso_symfile (oso2, member_bfd,
					     bfd_get_filename (member_bfd.get ()),
                                             main_objfile, symfile_flags);
                      oso2->name = NULL;
                      break;
                    }
                }

	      member_bfd = gdb_bfd_openr_next_archived_file (archive_bfd.get (),
							     member_bfd.get ());
	    }
          for (ix2 = ix; ix2 < last_ix; ix2++)
            {
              oso2 = &(*oso_vector_ptr)[ix2];

              if (oso2->name != NULL)
                warning (_("Could not find specified archive member "
                           "for OSO name \"%s\""), oso->name);
            }
          ix = last_ix;
	}
      else
	{
	  gdb_bfd_ref_ptr abfd (gdb_bfd_open (oso->name, gnutarget));
	  if (abfd == NULL)
            warning (_("`%s': can't open to read symbols: %s."), oso->name,
                     bfd_errmsg (bfd_get_error ()));
          else
            macho_add_oso_symfile (oso, abfd, oso->name, main_objfile,
				   symfile_flags);

          ix++;
        }
    }
}

/* DSYM (debug symbols) files contain the debug info of an executable.
   This is a separate file created by dsymutil(1) and is similar to debug
   link feature on ELF.
   DSYM files are located in a subdirectory.  Append DSYM_SUFFIX to the
   executable name and the executable base name to get the DSYM file name.  */
#define DSYM_SUFFIX ".dSYM/Contents/Resources/DWARF/"

/* Check if a dsym file exists for OBJFILE.  If so, returns a bfd for it
   and return *FILENAMEP with its original filename.
   Return NULL if no valid dsym file is found (FILENAMEP is not used in
   such case).  */

static gdb_bfd_ref_ptr
macho_check_dsym (struct objfile *objfile, std::string *filenamep)
{
  size_t name_len = strlen (objfile_name (objfile));
  size_t dsym_len = strlen (DSYM_SUFFIX);
  const char *base_name = lbasename (objfile_name (objfile));
  size_t base_len = strlen (base_name);
  char *dsym_filename = (char *) alloca (name_len + dsym_len + base_len + 1);
  bfd_mach_o_load_command *main_uuid;
  bfd_mach_o_load_command *dsym_uuid;

  strcpy (dsym_filename, objfile_name (objfile));
  strcpy (dsym_filename + name_len, DSYM_SUFFIX);
  strcpy (dsym_filename + name_len + dsym_len, base_name);

  if (access (dsym_filename, R_OK) != 0)
    return NULL;

  if (bfd_mach_o_lookup_command (objfile->obfd,
                                 BFD_MACH_O_LC_UUID, &main_uuid) == 0)
    {
      warning (_("can't find UUID in %s"), objfile_name (objfile));
      return NULL;
    }
  gdb_bfd_ref_ptr dsym_bfd (gdb_bfd_openr (dsym_filename, gnutarget));
  if (dsym_bfd == NULL)
    {
      warning (_("can't open dsym file %s"), dsym_filename);
      return NULL;
    }

  if (!bfd_check_format (dsym_bfd.get (), bfd_object))
    {
      warning (_("bad dsym file format: %s"), bfd_errmsg (bfd_get_error ()));
      return NULL;
    }

  if (bfd_mach_o_lookup_command (dsym_bfd.get (),
                                 BFD_MACH_O_LC_UUID, &dsym_uuid) == 0)
    {
      warning (_("can't find UUID in %s"), dsym_filename);
      return NULL;
    }
  if (memcmp (dsym_uuid->command.uuid.uuid, main_uuid->command.uuid.uuid,
              sizeof (main_uuid->command.uuid.uuid)))
    {
      warning (_("dsym file UUID doesn't match the one in %s"),
	       objfile_name (objfile));
      return NULL;
    }
  *filenamep = std::string (dsym_filename);
  return dsym_bfd;
}

static void
macho_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
{
  bfd *abfd = objfile->obfd;
  long storage_needed;
  std::vector<oso_el> oso_vector;
  /* We have to hold on to the symbol table until the call to
     macho_symfile_read_all_oso at the end of this function.  */
  gdb::def_vector<asymbol *> symbol_table;

  /* Get symbols from the symbol table only if the file is an executable.
     The symbol table of object files is not relocated and is expected to
     be in the executable.  */
  if (bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC))
    {
      std::string dsym_filename;

      /* Process the normal symbol table first.  */
      storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
      if (storage_needed < 0)
	error (_("Can't read symbols from %s: %s"),
	       bfd_get_filename (objfile->obfd),
	       bfd_errmsg (bfd_get_error ()));

      if (storage_needed > 0)
	{
	  long symcount;

	  symbol_table.resize (storage_needed / sizeof (asymbol *));

          minimal_symbol_reader reader (objfile);

	  symcount = bfd_canonicalize_symtab (objfile->obfd,
					      symbol_table.data ());

	  if (symcount < 0)
	    error (_("Can't read symbols from %s: %s"),
		   bfd_get_filename (objfile->obfd),
		   bfd_errmsg (bfd_get_error ()));

	  macho_symtab_read (reader, objfile, symcount, symbol_table.data (),
			     &oso_vector);

          reader.install ();
	}

      /* Try to read .eh_frame / .debug_frame.  */
      /* First, locate these sections.  We ignore the result status
	 as it only checks for debug info.  */
      dwarf2_has_info (objfile, NULL);
      dwarf2_build_frame_info (objfile);

      /* Check for DSYM file.  */
      gdb_bfd_ref_ptr dsym_bfd (macho_check_dsym (objfile, &dsym_filename));
      if (dsym_bfd != NULL)
	{
          struct bfd_section *asect, *dsect;

	  if (mach_o_debug_level > 0)
	    printf_unfiltered (_("dsym file found\n"));

          /* Set dsym section size.  */
          for (asect = objfile->obfd->sections, dsect = dsym_bfd->sections;
               asect && dsect;
               asect = asect->next, dsect = dsect->next)
            {
              if (strcmp (asect->name, dsect->name) != 0)
                break;
              bfd_set_section_size (dsect, bfd_section_size (asect));
            }

	  /* Add the dsym file as a separate file.  */
          symbol_file_add_separate (dsym_bfd.get (), dsym_filename.c_str (),
				    symfile_flags, objfile);

	  /* Don't try to read dwarf2 from main file or shared libraries.  */
          return;
	}
    }

  if (dwarf2_has_info (objfile, NULL))
    {
      /* DWARF 2 sections */
      dwarf2_build_psymtabs (objfile);
    }

  /* Then the oso.  */
  if (!oso_vector.empty ())
    macho_symfile_read_all_oso (&oso_vector, objfile, symfile_flags);
}

static bfd_byte *
macho_symfile_relocate (struct objfile *objfile, asection *sectp,
                        bfd_byte *buf)
{
  bfd *abfd = objfile->obfd;

  /* We're only interested in sections with relocation
     information.  */
  if ((sectp->flags & SEC_RELOC) == 0)
    return NULL;

  if (mach_o_debug_level > 0)
    printf_unfiltered (_("Relocate section '%s' of %s\n"),
                       sectp->name, objfile_name (objfile));

  return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL);
}

static void
macho_symfile_finish (struct objfile *objfile)
{
}

static void
macho_symfile_offsets (struct objfile *objfile,
                       const section_addr_info &addrs)
{
  unsigned int i;
  struct obj_section *osect;

  /* Allocate section_offsets.  */
  objfile->section_offsets.assign (bfd_count_sections (objfile->obfd), 0);

  /* This code is run when we first add the objfile with
     symfile_add_with_addrs_or_offsets, when "addrs" not "offsets" are
     passed in.  The place in symfile.c where the addrs are applied
     depends on the addrs having section names.  But in the dyld code
     we build an anonymous array of addrs, so that code is a no-op.
     Because of that, we have to apply the addrs to the sections here.
     N.B. if an objfile slides after we've already created it, then it
     goes through objfile_relocate.  */

  for (i = 0; i < addrs.size (); i++)
    {
      ALL_OBJFILE_OSECTIONS (objfile, osect)
	{
	  const char *bfd_sect_name = osect->the_bfd_section->name;

	  if (bfd_sect_name == addrs[i].name)
	    {
	      obj_section_offset (osect) = addrs[i].addr;
	      break;
	    }
	}
    }

  objfile->sect_index_text = 0;

  ALL_OBJFILE_OSECTIONS (objfile, osect)
    {
      const char *bfd_sect_name = osect->the_bfd_section->name;
      int sect_index = osect - objfile->sections;;

      if (startswith (bfd_sect_name, "LC_SEGMENT."))
	bfd_sect_name += 11;
      if (strcmp (bfd_sect_name, "__TEXT") == 0
	  || strcmp (bfd_sect_name, "__TEXT.__text") == 0)
	objfile->sect_index_text = sect_index;
    }
}

static const struct sym_fns macho_sym_fns = {
  macho_new_init,               /* init anything gbl to entire symtab */
  macho_symfile_init,           /* read initial info, setup for sym_read() */
  macho_symfile_read,           /* read a symbol file into symtab */
  NULL,				/* sym_read_psymbols */
  macho_symfile_finish,         /* finished with file, cleanup */
  macho_symfile_offsets,        /* xlate external to internal form */
  default_symfile_segments,	/* Get segment information from a file.  */
  NULL,
  macho_symfile_relocate,	/* Relocate a debug section.  */
  NULL,				/* sym_get_probes */
  &psym_functions
};

void _initialize_machoread ();
void
_initialize_machoread ()
{
  add_symtab_fns (bfd_target_mach_o_flavour, &macho_sym_fns);

  add_setshow_zuinteger_cmd ("mach-o", class_obscure,
			     &mach_o_debug_level,
			     _("Set if printing Mach-O symbols processing."),
			     _("Show if printing Mach-O symbols processing."),
			     NULL, NULL, NULL,
			     &setdebuglist, &showdebuglist);
}