aboutsummaryrefslogtreecommitdiff
path: root/gold/gdb-index.cc
blob: 5f1125f42716251f5156c93135abd599bcd52089 (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
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
// gdb-index.cc -- generate .gdb_index section for fast debug lookup

// Copyright (C) 2012-2014 Free Software Foundation, Inc.
// Written by Cary Coutant <ccoutant@google.com>.

// This file is part of gold.

// 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.

#include "gold.h"

#include "gdb-index.h"
#include "dwarf_reader.h"
#include "dwarf.h"
#include "object.h"
#include "output.h"
#include "demangle.h"

namespace gold
{

const int gdb_index_version = 7;

// Sizes of various records in the .gdb_index section.
const int gdb_index_offset_size = 4;
const int gdb_index_hdr_size = 6 * gdb_index_offset_size;
const int gdb_index_cu_size = 16;
const int gdb_index_tu_size = 24;
const int gdb_index_addr_size = 16 + gdb_index_offset_size;
const int gdb_index_sym_size = 2 * gdb_index_offset_size;

// This class manages the hashed symbol table for the .gdb_index section.
// It is essentially equivalent to the hashtab implementation in libiberty,
// but is copied into gdb sources and here for compatibility because its
// data structure is exposed on disk.

template <typename T>
class Gdb_hashtab
{
 public:
  Gdb_hashtab()
    : size_(0), capacity_(0), hashtab_(NULL)
  { }

  ~Gdb_hashtab()
  {
    for (size_t i = 0; i < this->capacity_; ++i)
      if (this->hashtab_[i] != NULL)
	delete this->hashtab_[i];
    delete[] this->hashtab_;
  }

  // Add a symbol.
  T*
  add(T* symbol)
  {
    // Resize the hash table if necessary.
    if (4 * this->size_ / 3 >= this->capacity_)
      this->expand();

    T** slot = this->find_slot(symbol);
    if (*slot == NULL)
      {
	++this->size_;
	*slot = symbol;
      }

    return *slot;
  }

  // Return the current size.
  size_t
  size() const
  { return this->size_; }

  // Return the current capacity.
  size_t
  capacity() const
  { return this->capacity_; }

  // Return the contents of slot N.
  T*
  operator[](size_t n)
  { return this->hashtab_[n]; }

 private:
  // Find a symbol in the hash table, or return an empty slot if
  // the symbol is not in the table.
  T**
  find_slot(T* symbol)
  {
    unsigned int index = symbol->hash() & (this->capacity_ - 1);
    unsigned int step = ((symbol->hash() * 17) & (this->capacity_ - 1)) | 1;

    for (;;)
      {
	if (this->hashtab_[index] == NULL
	    || this->hashtab_[index]->equal(symbol))
	  return &this->hashtab_[index];
	index = (index + step) & (this->capacity_ - 1);
      }
  }

  // Expand the hash table.
  void
  expand()
  {
    if (this->capacity_ == 0)
      {
	// Allocate the hash table for the first time.
	this->capacity_ = Gdb_hashtab::initial_size;
	this->hashtab_ = new T*[this->capacity_];
	memset(this->hashtab_, 0, this->capacity_ * sizeof(T*));
      }
    else
      {
	// Expand and rehash.
	unsigned int old_cap = this->capacity_;
	T** old_hashtab = this->hashtab_;
	this->capacity_ *= 2;
	this->hashtab_ = new T*[this->capacity_];
	memset(this->hashtab_, 0, this->capacity_ * sizeof(T*));
	for (size_t i = 0; i < old_cap; ++i)
	  {
	    if (old_hashtab[i] != NULL)
	      {
		T** slot = this->find_slot(old_hashtab[i]);
		*slot = old_hashtab[i];
	      }
	  }
	delete[] old_hashtab;
      }
  }

  // Initial size of the hash table; must be a power of 2.
  static const int initial_size = 1024;
  size_t size_;
  size_t capacity_;
  T** hashtab_;
};

// The hash function for strings in the mapped index.  This is copied
// directly from gdb/dwarf2read.c.

static unsigned int
mapped_index_string_hash(const unsigned char* str)
{
  unsigned int r = 0;
  unsigned char c;

  while ((c = *str++) != 0)
    {
      if (gdb_index_version >= 5)
	c = tolower (c);
      r = r * 67 + c - 113;
    }

  return r;
}

// A specialization of Dwarf_info_reader, for building the .gdb_index.

class Gdb_index_info_reader : public Dwarf_info_reader
{
 public:
  Gdb_index_info_reader(bool is_type_unit,
			Relobj* object,
			const unsigned char* symbols,
			off_t symbols_size,
			unsigned int shndx,
			unsigned int reloc_shndx,
			unsigned int reloc_type,
			Gdb_index* gdb_index)
    : Dwarf_info_reader(is_type_unit, object, symbols, symbols_size, shndx,
			reloc_shndx, reloc_type),
      gdb_index_(gdb_index), cu_index_(0), cu_language_(0)
  { }

  ~Gdb_index_info_reader()
  { this->clear_declarations(); }

  // Print usage statistics.
  static void
  print_stats();

 protected:
  // Visit a compilation unit.
  virtual void
  visit_compilation_unit(off_t cu_offset, off_t cu_length, Dwarf_die*);

  // Visit a type unit.
  virtual void
  visit_type_unit(off_t tu_offset, off_t tu_length, off_t type_offset,
		  uint64_t signature, Dwarf_die*);

 private:
  // A map for recording DIEs we've seen that may be referred to be
  // later DIEs (via DW_AT_specification or DW_AT_abstract_origin).
  // The map is indexed by a DIE offset within the compile unit.
  // PARENT_OFFSET_ is the offset of the DIE that represents the
  // outer context, and NAME_ is a pointer to a component of the
  // fully-qualified name.
  // Normally, the names we point to are in a string table, so we don't
  // have to manage them, but when we have a fully-qualified name
  // computed, we put it in the table, and set PARENT_OFFSET_ to -1
  // indicate a string that we are managing.
  struct Declaration_pair
  {
    Declaration_pair(off_t parent_offset, const char* name)
      : parent_offset_(parent_offset), name_(name)
    { }

    off_t parent_offset_;
    const char* name_; 
  };
  typedef Unordered_map<off_t, Declaration_pair> Declaration_map;

  // Visit a top-level DIE.
  void
  visit_top_die(Dwarf_die* die);

  // Visit the children of a DIE.
  void
  visit_children(Dwarf_die* die, Dwarf_die* context);

  // Visit a DIE.
  void
  visit_die(Dwarf_die* die, Dwarf_die* context);

  // Visit the children of a DIE.
  void
  visit_children_for_decls(Dwarf_die* die);

  // Visit a DIE.
  void
  visit_die_for_decls(Dwarf_die* die, Dwarf_die* context);

  // Guess a fully-qualified name for a class type, based on member function
  // linkage names.
  std::string
  guess_full_class_name(Dwarf_die* die);

  // Add a declaration DIE to the table of declarations.
  void
  add_declaration(Dwarf_die* die, Dwarf_die* context);

  // Add a declaration whose fully-qualified name is already known.
  void
  add_declaration_with_full_name(Dwarf_die* die, const char* full_name);

  // Return the context for a DIE whose parent is at DIE_OFFSET.
  std::string
  get_context(off_t die_offset);

  // Construct a fully-qualified name for DIE.
  std::string
  get_qualified_name(Dwarf_die* die, Dwarf_die* context);

  // Record the address ranges for a compilation unit.
  void
  record_cu_ranges(Dwarf_die* die);

  // Wrapper for read_pubtable.
  bool
  read_pubnames_and_pubtypes(Dwarf_die* die);

  // Read the .debug_pubnames and .debug_pubtypes tables.
  bool
  read_pubtable(Dwarf_pubnames_table* table, off_t offset);

  // Clear the declarations map.
  void
  clear_declarations();

  // The Gdb_index section.
  Gdb_index* gdb_index_;
  // The current CU index (negative for a TU).
  int cu_index_;
  // The language of the current CU or TU.
  unsigned int cu_language_;
  // Map from DIE offset to (parent offset, name) pair,
  // for DW_AT_specification.
  Declaration_map declarations_;

  // Statistics.
  // Total number of DWARF compilation units processed.
  static unsigned int dwarf_cu_count;
  // Number of DWARF compilation units with pubnames/pubtypes.
  static unsigned int dwarf_cu_nopubnames_count;
  // Total number of DWARF type units processed.
  static unsigned int dwarf_tu_count;
  // Number of DWARF type units with pubnames/pubtypes.
  static unsigned int dwarf_tu_nopubnames_count;
};

// Total number of DWARF compilation units processed.
unsigned int Gdb_index_info_reader::dwarf_cu_count = 0;
// Number of DWARF compilation units without pubnames/pubtypes.
unsigned int Gdb_index_info_reader::dwarf_cu_nopubnames_count = 0;
// Total number of DWARF type units processed.
unsigned int Gdb_index_info_reader::dwarf_tu_count = 0;
// Number of DWARF type units without pubnames/pubtypes.
unsigned int Gdb_index_info_reader::dwarf_tu_nopubnames_count = 0;

// Process a compilation unit and parse its child DIE.

void
Gdb_index_info_reader::visit_compilation_unit(off_t cu_offset, off_t cu_length,
					      Dwarf_die* root_die)
{
  ++Gdb_index_info_reader::dwarf_cu_count;
  this->cu_index_ = this->gdb_index_->add_comp_unit(cu_offset, cu_length);
  this->visit_top_die(root_die);
}

// Process a type unit and parse its child DIE.

void
Gdb_index_info_reader::visit_type_unit(off_t tu_offset, off_t,
				       off_t type_offset, uint64_t signature,
				       Dwarf_die* root_die)
{
  ++Gdb_index_info_reader::dwarf_tu_count;
  // Use a negative index to flag this as a TU instead of a CU.
  this->cu_index_ = -1 - this->gdb_index_->add_type_unit(tu_offset, type_offset,
							 signature);
  this->visit_top_die(root_die);
}

// Process a top-level DIE.
// For compile_unit DIEs, record the address ranges.  For all
// interesting tags, add qualified names to the symbol table
// and process interesting children.  We may need to process
// certain children just for saving declarations that might be
// referenced by later DIEs with a DW_AT_specification attribute.

void
Gdb_index_info_reader::visit_top_die(Dwarf_die* die)
{
  this->clear_declarations();

  switch (die->tag())
    {
      case elfcpp::DW_TAG_compile_unit:
      case elfcpp::DW_TAG_type_unit:
	this->cu_language_ = die->int_attribute(elfcpp::DW_AT_language);
	// Check for languages that require specialized knowledge to
	// construct fully-qualified names, that we don't yet support.
	if (this->cu_language_ == elfcpp::DW_LANG_Ada83
	    || this->cu_language_ == elfcpp::DW_LANG_Fortran77
	    || this->cu_language_ == elfcpp::DW_LANG_Fortran90
	    || this->cu_language_ == elfcpp::DW_LANG_Java
	    || this->cu_language_ == elfcpp::DW_LANG_Ada95
	    || this->cu_language_ == elfcpp::DW_LANG_Fortran95)
	  {
	    gold_warning(_("%s: --gdb-index currently supports "
			   "only C and C++ languages"),
			 this->object()->name().c_str());
	    return;
	  }
	if (die->tag() == elfcpp::DW_TAG_compile_unit)
	  this->record_cu_ranges(die);
	// If there is a pubnames and/or pubtypes section for this
	// compilation unit, use those; otherwise, parse the DWARF
	// info to extract the names.
	if (!this->read_pubnames_and_pubtypes(die))
	  {
	    if (die->tag() == elfcpp::DW_TAG_compile_unit)
	      ++Gdb_index_info_reader::dwarf_cu_nopubnames_count;
	    else
	      ++Gdb_index_info_reader::dwarf_tu_nopubnames_count;
	    this->visit_children(die, NULL);
	  }
	break;
      default:
	// The top level DIE should be one of the above.
	gold_warning(_("%s: top level DIE is not DW_TAG_compile_unit "
		       "or DW_TAG_type_unit"),
		     this->object()->name().c_str());
	return;
    }

}

// Visit the children of PARENT, looking for symbols to add to the index.
// CONTEXT points to the DIE to use for constructing the qualified name --
// NULL if PARENT is the top-level DIE; otherwise it is the same as PARENT.

void
Gdb_index_info_reader::visit_children(Dwarf_die* parent, Dwarf_die* context)
{
  off_t next_offset = 0;
  for (off_t die_offset = parent->child_offset();
       die_offset != 0;
       die_offset = next_offset)
    {
      Dwarf_die die(this, die_offset, parent);
      if (die.tag() == 0)
	break;
      this->visit_die(&die, context);
      next_offset = die.sibling_offset();
    }
}

// Visit a child DIE, looking for symbols to add to the index.
// CONTEXT is the parent DIE, used for constructing the qualified name;
// it is NULL if the parent DIE is the top-level DIE.

void
Gdb_index_info_reader::visit_die(Dwarf_die* die, Dwarf_die* context)
{
  switch (die->tag())
    {
      case elfcpp::DW_TAG_subprogram:
      case elfcpp::DW_TAG_constant:
      case elfcpp::DW_TAG_variable:
      case elfcpp::DW_TAG_enumerator:
      case elfcpp::DW_TAG_base_type:
	if (die->is_declaration())
	  this->add_declaration(die, context);
	else
	  {
	    // If the DIE is not a declaration, add it to the index.
	    std::string full_name = this->get_qualified_name(die, context);
	    if (!full_name.empty())
	      this->gdb_index_->add_symbol(this->cu_index_,
                                           full_name.c_str(), 0);
	  }
	break;
      case elfcpp::DW_TAG_typedef:
      case elfcpp::DW_TAG_union_type:
      case elfcpp::DW_TAG_class_type:
      case elfcpp::DW_TAG_interface_type:
      case elfcpp::DW_TAG_structure_type:
      case elfcpp::DW_TAG_enumeration_type:
      case elfcpp::DW_TAG_subrange_type:
      case elfcpp::DW_TAG_namespace:
	{
	  std::string full_name;
	  
	  // For classes at the top level, we need to look for a
	  // member function with a linkage name in order to get
	  // the properly-canonicalized name.
	  if (context == NULL
	      && (die->tag() == elfcpp::DW_TAG_class_type
		  || die->tag() == elfcpp::DW_TAG_structure_type
		  || die->tag() == elfcpp::DW_TAG_union_type))
	    full_name.assign(this->guess_full_class_name(die));

	  // Because we will visit the children, we need to add this DIE
	  // to the declarations table.
	  if (full_name.empty())
	    this->add_declaration(die, context);
	  else
	    this->add_declaration_with_full_name(die, full_name.c_str());

	  // If the DIE is not a declaration, add it to the index.
	  // Gdb stores a namespace in the index even when it is
	  // a declaration.
	  if (die->tag() == elfcpp::DW_TAG_namespace
	      || !die->is_declaration())
	    {
	      if (full_name.empty())
		full_name = this->get_qualified_name(die, context);
	      if (!full_name.empty())
		this->gdb_index_->add_symbol(this->cu_index_,
					     full_name.c_str(), 0);
	    }

	  // We're interested in the children only for namespaces and
	  // enumeration types.  For enumeration types, we do not include
	  // the enumeration tag as part of the full name.  For other tags,
	  // visit the children only to collect declarations.
	  if (die->tag() == elfcpp::DW_TAG_namespace
	      || die->tag() == elfcpp::DW_TAG_enumeration_type)
	    this->visit_children(die, die);
	  else
	    this->visit_children_for_decls(die);
	}
	break;
      default:
	break;
    }
}

// Visit the children of PARENT, looking only for declarations that
// may be referenced by later specification DIEs.

void
Gdb_index_info_reader::visit_children_for_decls(Dwarf_die* parent)
{
  off_t next_offset = 0;
  for (off_t die_offset = parent->child_offset();
       die_offset != 0;
       die_offset = next_offset)
    {
      Dwarf_die die(this, die_offset, parent);
      if (die.tag() == 0)
	break;
      this->visit_die_for_decls(&die, parent);
      next_offset = die.sibling_offset();
    }
}

// Visit a child DIE, looking only for declarations that
// may be referenced by later specification DIEs.

void
Gdb_index_info_reader::visit_die_for_decls(Dwarf_die* die, Dwarf_die* context)
{
  switch (die->tag())
    {
      case elfcpp::DW_TAG_subprogram:
      case elfcpp::DW_TAG_constant:
      case elfcpp::DW_TAG_variable:
      case elfcpp::DW_TAG_enumerator:
      case elfcpp::DW_TAG_base_type:
	{
	  if (die->is_declaration())
	    this->add_declaration(die, context);
	}
	break;
      case elfcpp::DW_TAG_typedef:
      case elfcpp::DW_TAG_union_type:
      case elfcpp::DW_TAG_class_type:
      case elfcpp::DW_TAG_interface_type:
      case elfcpp::DW_TAG_structure_type:
      case elfcpp::DW_TAG_enumeration_type:
      case elfcpp::DW_TAG_subrange_type:
      case elfcpp::DW_TAG_namespace:
	{
	  if (die->is_declaration())
	    this->add_declaration(die, context);
	  this->visit_children_for_decls(die);
	}
	break;
      default:
	break;
    }
}

// Extract the class name from the linkage name of a member function.
// This code is adapted from ../gdb/cp-support.c.

#define d_left(dc) (dc)->u.s_binary.left
#define d_right(dc) (dc)->u.s_binary.right

static char*
class_name_from_linkage_name(const char* linkage_name)
{
  void* storage;
  struct demangle_component* tree =
      cplus_demangle_v3_components(linkage_name, DMGL_NO_OPTS, &storage);
  if (tree == NULL)
    return NULL;

  int done = 0;

  // First strip off any qualifiers, if we have a function or
  // method.
  while (!done)
    switch (tree->type)
      {
	case DEMANGLE_COMPONENT_CONST:
	case DEMANGLE_COMPONENT_RESTRICT:
	case DEMANGLE_COMPONENT_VOLATILE:
	case DEMANGLE_COMPONENT_CONST_THIS:
	case DEMANGLE_COMPONENT_RESTRICT_THIS:
	case DEMANGLE_COMPONENT_VOLATILE_THIS:
	case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
	  tree = d_left(tree);
	  break;
	default:
	  done = 1;
	  break;
      }

  // If what we have now is a function, discard the argument list.
  if (tree->type == DEMANGLE_COMPONENT_TYPED_NAME)
    tree = d_left(tree);

  // If what we have now is a template, strip off the template
  // arguments.  The left subtree may be a qualified name.
  if (tree->type == DEMANGLE_COMPONENT_TEMPLATE)
    tree = d_left(tree);

  // What we have now should be a name, possibly qualified.
  // Additional qualifiers could live in the left subtree or the right
  // subtree.  Find the last piece.
  done = 0;
  struct demangle_component* prev_comp = NULL;
  struct demangle_component* cur_comp = tree;
  while (!done)
    switch (cur_comp->type)
      {
	case DEMANGLE_COMPONENT_QUAL_NAME:
	case DEMANGLE_COMPONENT_LOCAL_NAME:
	  prev_comp = cur_comp;
	  cur_comp = d_right(cur_comp);
	  break;
	case DEMANGLE_COMPONENT_TEMPLATE:
	case DEMANGLE_COMPONENT_NAME:
	case DEMANGLE_COMPONENT_CTOR:
	case DEMANGLE_COMPONENT_DTOR:
	case DEMANGLE_COMPONENT_OPERATOR:
	case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
	  done = 1;
	  break;
	default:
	  done = 1;
	  cur_comp = NULL;
	  break;
      }

  char* ret = NULL;
  if (cur_comp != NULL && prev_comp != NULL)
    {
      // We want to discard the rightmost child of PREV_COMP.
      *prev_comp = *d_left(prev_comp);
      size_t allocated_size;
      ret = cplus_demangle_print(DMGL_NO_OPTS, tree, 30, &allocated_size);
    }

  free(storage);
  return ret;
}

// Guess a fully-qualified name for a class type, based on member function
// linkage names.  This is needed for class/struct/union types at the
// top level, because GCC does not always properly embed them within
// the namespace.  As in gdb, we look for a member function with a linkage
// name and extract the qualified name from the demangled name.

std::string
Gdb_index_info_reader::guess_full_class_name(Dwarf_die* die)
{
  std::string full_name;
  off_t next_offset = 0;
  
  // This routine scans ahead in the DIE structure, possibly advancing
  // the relocation tracker beyond the current DIE.  We need to checkpoint
  // the tracker and reset it when we're done.
  uint64_t checkpoint = this->get_reloc_checkpoint();

  for (off_t child_offset = die->child_offset();
       child_offset != 0;
       child_offset = next_offset)
    {
      Dwarf_die child(this, child_offset, die);
      if (child.tag() == 0)
	break;
      if (child.tag() == elfcpp::DW_TAG_subprogram)
        {
          const char* linkage_name = child.linkage_name();
	  if (linkage_name != NULL)
	    {
	      char* guess = class_name_from_linkage_name(linkage_name);
	      if (guess != NULL)
	        {
		  full_name.assign(guess);
		  free(guess);
		  break;
	        }
	    }
        }
      next_offset = child.sibling_offset();
    }

  this->reset_relocs(checkpoint);
  return full_name;
}

// Add a declaration DIE to the table of declarations.

void
Gdb_index_info_reader::add_declaration(Dwarf_die* die, Dwarf_die* context)
{
  const char* name = die->name();

  off_t parent_offset = context != NULL ? context->offset() : 0;

  // If this DIE has a DW_AT_specification or DW_AT_abstract_origin
  // attribute, use the parent and name from the earlier declaration.
  off_t spec = die->specification();
  if (spec == 0)
    spec = die->abstract_origin();
  if (spec > 0)
    {
      Declaration_map::iterator it = this->declarations_.find(spec);
      if (it != this->declarations_.end())
        {
	  parent_offset = it->second.parent_offset_;
	  name = it->second.name_;
        }
    }

  if (name == NULL)
    {
      if (die->tag() == elfcpp::DW_TAG_namespace)
        name = "(anonymous namespace)";
      else if (die->tag() == elfcpp::DW_TAG_union_type)
        name = "(anonymous union)";
      else
        name = "(unknown)";
    }

  Declaration_pair decl(parent_offset, name);
  this->declarations_.insert(std::make_pair(die->offset(), decl));
}

// Add a declaration whose fully-qualified name is already known.
// In the case where we had to get the canonical name by demangling
// a linkage name, this ensures we use that name instead of the one
// provided in DW_AT_name.

void
Gdb_index_info_reader::add_declaration_with_full_name(
    Dwarf_die* die,
    const char* full_name)
{
  // We need to copy the name.
  int len = strlen(full_name);
  char* copy = new char[len + 1];
  memcpy(copy, full_name, len + 1);

  // Flag that we now manage the memory this points to.
  Declaration_pair decl(-1, copy);
  this->declarations_.insert(std::make_pair(die->offset(), decl));
}

// Return the context for a DIE whose parent is at DIE_OFFSET.

std::string
Gdb_index_info_reader::get_context(off_t die_offset)
{
  std::string context;
  Declaration_map::iterator it = this->declarations_.find(die_offset);
  if (it != this->declarations_.end())
    {
      off_t parent_offset = it->second.parent_offset_;
      if (parent_offset > 0)
	{
	  context = get_context(parent_offset);
	  context.append("::");
	}
      if (it->second.name_ != NULL)
        context.append(it->second.name_);
    }
  return context;
}

// Construct the fully-qualified name for DIE.

std::string
Gdb_index_info_reader::get_qualified_name(Dwarf_die* die, Dwarf_die* context)
{
  std::string full_name;
  const char* name = die->name();

  off_t parent_offset = context != NULL ? context->offset() : 0;

  // If this DIE has a DW_AT_specification or DW_AT_abstract_origin
  // attribute, use the parent and name from the earlier declaration.
  off_t spec = die->specification();
  if (spec == 0)
    spec = die->abstract_origin();
  if (spec > 0)
    {
      Declaration_map::iterator it = this->declarations_.find(spec);
      if (it != this->declarations_.end())
        {
	  parent_offset = it->second.parent_offset_;
	  name = it->second.name_;
        }
    }

  if (name == NULL && die->tag() == elfcpp::DW_TAG_namespace)
    name = "(anonymous namespace)";
  else if (name == NULL)
    return full_name;

  // If this is an enumerator constant, skip the immediate parent,
  // which is the enumeration tag.
  if (die->tag() == elfcpp::DW_TAG_enumerator)
    {
      Declaration_map::iterator it = this->declarations_.find(parent_offset);
      if (it != this->declarations_.end())
	parent_offset = it->second.parent_offset_;
    }

  if (parent_offset > 0)
    {
      full_name.assign(this->get_context(parent_offset));
      full_name.append("::");
    }
  full_name.append(name);

  return full_name;
}

// Record the address ranges for a compilation unit.

void
Gdb_index_info_reader::record_cu_ranges(Dwarf_die* die)
{
  unsigned int shndx;
  unsigned int shndx2;

  off_t ranges_offset = die->ref_attribute(elfcpp::DW_AT_ranges, &shndx);
  if (ranges_offset != -1)
    {
      Dwarf_range_list* ranges = this->read_range_list(shndx, ranges_offset);
      if (ranges != NULL)
	this->gdb_index_->add_address_range_list(this->object(),
						 this->cu_index_, ranges);
      return;
    }

  off_t low_pc = die->address_attribute(elfcpp::DW_AT_low_pc, &shndx);
  off_t high_pc = die->address_attribute(elfcpp::DW_AT_high_pc, &shndx2);
  if (high_pc == -1)
    {
      high_pc = die->uint_attribute(elfcpp::DW_AT_high_pc);
      high_pc += low_pc;
      shndx2 = shndx;
    }
  if ((low_pc != 0 || high_pc != 0) && low_pc != -1)
    {
      if (shndx != shndx2)
        {
	  gold_warning(_("%s: DWARF info may be corrupt; low_pc and high_pc "
			 "are in different sections"),
		       this->object()->name().c_str());
	  return;
	}
      if (shndx == 0 || this->object()->is_section_included(shndx))
        {
	  Dwarf_range_list* ranges = new Dwarf_range_list();
	  ranges->add(shndx, low_pc, high_pc);
	  this->gdb_index_->add_address_range_list(this->object(),
						   this->cu_index_, ranges);
        }
    }
}

// Read table and add the relevant names to the index.  Returns true
// if any names were added.

bool
Gdb_index_info_reader::read_pubtable(Dwarf_pubnames_table* table, off_t offset)
{
  // If we couldn't read the section when building the cu_pubname_map,
  // then we won't find any pubnames now.
  if (table == NULL)
    return false;

  if (!table->read_header(offset))
    return false;
  while (true)
    {
      uint8_t flag_byte;
      const char* name = table->next_name(&flag_byte);
      if (name == NULL)
        break;

      this->gdb_index_->add_symbol(this->cu_index_, name, flag_byte);
    }
  return true;
}

// Read the .debug_pubnames and .debug_pubtypes tables for the CU or TU.
// Returns TRUE if either a pubnames or pubtypes section was found.

bool
Gdb_index_info_reader::read_pubnames_and_pubtypes(Dwarf_die* die)
{
  // If this is a skeleton debug-type die (generated via
  // -gsplit-dwarf), then the associated pubnames should have been
  // read along with the corresponding CU.  In any case, there isn't
  // enough info inside to build a gdb index entry.
  if (die->tag() == elfcpp::DW_TAG_type_unit
      && die->string_attribute(elfcpp::DW_AT_GNU_dwo_name))
    return true;

  // We use stmt_list_off as a unique identifier for the
  // compilation unit and its associated type units.
  unsigned int shndx;
  off_t stmt_list_off = die->ref_attribute (elfcpp::DW_AT_stmt_list,
                                            &shndx);
  // Look for the attr as either a flag or a ref.
  off_t offset = die->ref_attribute(elfcpp::DW_AT_GNU_pubnames, &shndx);

  // Newer versions of GCC generate CUs, but not TUs, with
  // DW_AT_FORM_flag_present.
  unsigned int flag = die->uint_attribute(elfcpp::DW_AT_GNU_pubnames);
  if (offset == -1 && flag == 0)
    {
      // Didn't find the attribute.
      if (die->tag() == elfcpp::DW_TAG_type_unit)
        {
          // If die is a TU, then it might correspond to a CU which we
          // have read. If it does, then no need to read the pubnames.
          // If it doesn't, then the caller will have to parse the
          // dies manually to find the names.
          return this->gdb_index_->pubnames_read(this->object(),
                                                 stmt_list_off);
        }
      else
        {
          // No attribute on the CU means that no pubnames were read.
          return false;
        }
    }

  // We found the attribute, so we can check if the corresponding
  // pubnames have been read.
  if (this->gdb_index_->pubnames_read(this->object(), stmt_list_off))
    return true;

  this->gdb_index_->set_pubnames_read(this->object(), stmt_list_off);

  // We have an attribute, and the pubnames haven't been read, so read
  // them.
  bool names = false;
  // In some of the cases, we could rely on the previous value of
  // offset here, but sorting out which cases complicates the logic
  // enough that it isn't worth it. So just look up the offset again.
  offset = this->gdb_index_->find_pubname_offset(this->cu_offset());
  names = this->read_pubtable(this->gdb_index_->pubnames_table(), offset);

  bool types = false;
  offset = this->gdb_index_->find_pubtype_offset(this->cu_offset());
  types = this->read_pubtable(this->gdb_index_->pubtypes_table(), offset);
  return names || types;
}

// Clear the declarations map.
void
Gdb_index_info_reader::clear_declarations()
{
  // Free strings in memory we manage.
  for (Declaration_map::iterator it = this->declarations_.begin();
       it != this->declarations_.end();
       ++it)
    {
      if (it->second.parent_offset_ == -1)
	delete[] it->second.name_;
    }

  this->declarations_.clear();
}

// Print usage statistics.
void
Gdb_index_info_reader::print_stats()
{
  fprintf(stderr, _("%s: DWARF CUs: %u\n"),
          program_name, Gdb_index_info_reader::dwarf_cu_count);
  fprintf(stderr, _("%s: DWARF CUs without pubnames/pubtypes: %u\n"),
          program_name, Gdb_index_info_reader::dwarf_cu_nopubnames_count);
  fprintf(stderr, _("%s: DWARF TUs: %u\n"),
          program_name, Gdb_index_info_reader::dwarf_tu_count);
  fprintf(stderr, _("%s: DWARF TUs without pubnames/pubtypes: %u\n"),
          program_name, Gdb_index_info_reader::dwarf_tu_nopubnames_count);
}

// Class Gdb_index.

// Construct the .gdb_index section.

Gdb_index::Gdb_index(Output_section* gdb_index_section)
  : Output_section_data(4),
    pubnames_table_(NULL),
    pubtypes_table_(NULL),
    gdb_index_section_(gdb_index_section),
    comp_units_(),
    type_units_(),
    ranges_(),
    cu_vector_list_(),
    cu_vector_offsets_(NULL),
    stringpool_(),
    tu_offset_(0),
    addr_offset_(0),
    symtab_offset_(0),
    cu_pool_offset_(0),
    stringpool_offset_(0),
    pubnames_object_(NULL),
    stmt_list_offset_(-1)
{
  this->gdb_symtab_ = new Gdb_hashtab<Gdb_symbol>();
}

Gdb_index::~Gdb_index()
{
  // Free the memory used by the symbol table.
  delete this->gdb_symtab_;
  // Free the memory used by the CU vectors.
  for (unsigned int i = 0; i < this->cu_vector_list_.size(); ++i)
    delete this->cu_vector_list_[i];
}


// Scan the pubnames and pubtypes sections and build a map of the
// various cus and tus they refer to, so we can process the entries
// when we encounter the die for that cu or tu.
// Return the just-read table so it can be cached.

Dwarf_pubnames_table*
Gdb_index::map_pubtable_to_dies(unsigned int attr,
                                Gdb_index_info_reader* dwinfo,
                                Relobj* object,
                                const unsigned char* symbols,
                                off_t symbols_size)
{
  uint64_t section_offset = 0;
  Dwarf_pubnames_table* table;
  Pubname_offset_map* map;

  if (attr == elfcpp::DW_AT_GNU_pubnames)
    {
      table = new Dwarf_pubnames_table(dwinfo, false);
      map = &this->cu_pubname_map_;
    }
  else
    {
      table = new Dwarf_pubnames_table(dwinfo, true);
      map = &this->cu_pubtype_map_;
    }

  map->clear();
  if (!table->read_section(object, symbols, symbols_size))
    return NULL;

  while (table->read_header(section_offset))
    {
      map->insert(std::make_pair(table->cu_offset(), section_offset));
      section_offset += table->subsection_size();
    }

  return table;
}

// Wrapper for map_pubtable_to_dies

void
Gdb_index::map_pubnames_and_types_to_dies(Gdb_index_info_reader* dwinfo,
                                          Relobj* object,
                                          const unsigned char* symbols,
                                          off_t symbols_size)
{
  // This is a new object, so reset the relevant variables.
  this->pubnames_object_ = object;
  this->stmt_list_offset_ = -1;

  delete this->pubnames_table_;
  this->pubnames_table_
      = this->map_pubtable_to_dies(elfcpp::DW_AT_GNU_pubnames, dwinfo,
                                   object, symbols, symbols_size);
  delete this->pubtypes_table_;
  this->pubtypes_table_
      = this->map_pubtable_to_dies(elfcpp::DW_AT_GNU_pubtypes, dwinfo,
                                   object, symbols, symbols_size);
}

// Given a cu_offset, find the associated section of the pubnames
// table.

off_t
Gdb_index::find_pubname_offset(off_t cu_offset)
{
  Pubname_offset_map::iterator it = this->cu_pubname_map_.find(cu_offset);
  if (it != this->cu_pubname_map_.end())
    return it->second;
  return -1;
}

// Given a cu_offset, find the associated section of the pubnames
// table.

off_t
Gdb_index::find_pubtype_offset(off_t cu_offset)
{
  Pubname_offset_map::iterator it = this->cu_pubtype_map_.find(cu_offset);
  if (it != this->cu_pubtype_map_.end())
    return it->second;
  return -1;
}

// Scan a .debug_info or .debug_types input section.

void
Gdb_index::scan_debug_info(bool is_type_unit,
			   Relobj* object,
			   const unsigned char* symbols,
			   off_t symbols_size,
			   unsigned int shndx,
			   unsigned int reloc_shndx,
			   unsigned int reloc_type)
{
  Gdb_index_info_reader dwinfo(is_type_unit, object,
			       symbols, symbols_size,
			       shndx, reloc_shndx,
			       reloc_type, this);
  if (object != this->pubnames_object_)
    map_pubnames_and_types_to_dies(&dwinfo, object, symbols, symbols_size);
  dwinfo.parse();
}

// Add a symbol.

void
Gdb_index::add_symbol(int cu_index, const char* sym_name, uint8_t flags)
{
  unsigned int hash = mapped_index_string_hash(
      reinterpret_cast<const unsigned char*>(sym_name));
  Gdb_symbol* sym = new Gdb_symbol();
  this->stringpool_.add(sym_name, true, &sym->name_key);
  sym->hashval = hash;
  sym->cu_vector_index = 0;

  Gdb_symbol* found = this->gdb_symtab_->add(sym);
  if (found == sym)
    {
      // New symbol -- allocate a new CU index vector.
      found->cu_vector_index = this->cu_vector_list_.size();
      this->cu_vector_list_.push_back(new Cu_vector());
    }
  else
    {
      // Found an existing symbol -- append to the existing
      // CU index vector.
      delete sym;
    }

  // Add the CU index to the vector list for this symbol,
  // if it's not already on the list.  We only need to
  // check the last added entry.
  Cu_vector* cu_vec = this->cu_vector_list_[found->cu_vector_index];
  if (cu_vec->size() == 0
      || cu_vec->back().first != cu_index
      || cu_vec->back().second != flags)
    cu_vec->push_back(std::make_pair(cu_index, flags));
}

// Return TRUE if we have already processed the pubnames associated
// with the statement list at the given OFFSET.

bool
Gdb_index::pubnames_read(const Relobj* object, off_t offset)
{
  bool ret = (this->pubnames_object_ == object
	      && this->stmt_list_offset_ == offset);
  return ret;
}

// Record that we have processed the pubnames associated with the
// statement list for OBJECT at the given OFFSET.

void
Gdb_index::set_pubnames_read(const Relobj* object, off_t offset)
{
  this->pubnames_object_ = object;
  this->stmt_list_offset_ = offset;
}

// Set the size of the .gdb_index section.

void
Gdb_index::set_final_data_size()
{
  // Finalize the string pool.
  this->stringpool_.set_string_offsets();

  // Compute the total size of the CU vectors.
  // For each CU vector, include one entry for the count at the
  // beginning of the vector.
  unsigned int cu_vector_count = this->cu_vector_list_.size();
  unsigned int cu_vector_size = 0;
  this->cu_vector_offsets_ = new off_t[cu_vector_count];
  for (unsigned int i = 0; i < cu_vector_count; ++i)
    {
      Cu_vector* cu_vec = this->cu_vector_list_[i];
      cu_vector_offsets_[i] = cu_vector_size;
      cu_vector_size += gdb_index_offset_size * (cu_vec->size() + 1);
    }

  // Assign relative offsets to each portion of the index,
  // and find the total size of the section.
  section_size_type data_size = gdb_index_hdr_size;
  data_size += this->comp_units_.size() * gdb_index_cu_size;
  this->tu_offset_ = data_size;
  data_size += this->type_units_.size() * gdb_index_tu_size;
  this->addr_offset_ = data_size;
  for (unsigned int i = 0; i < this->ranges_.size(); ++i)
    data_size += this->ranges_[i].ranges->size() * gdb_index_addr_size;
  this->symtab_offset_ = data_size;
  data_size += this->gdb_symtab_->capacity() * gdb_index_sym_size;
  this->cu_pool_offset_ = data_size;
  data_size += cu_vector_size;
  this->stringpool_offset_ = data_size;
  data_size += this->stringpool_.get_strtab_size();

  this->set_data_size(data_size);
}

// Write the data to the file.

void
Gdb_index::do_write(Output_file* of)
{
  const off_t off = this->offset();
  const off_t oview_size = this->data_size();
  unsigned char* const oview = of->get_output_view(off, oview_size);
  unsigned char* pov = oview;

  // Write the file header.
  // (1) Version number.
  elfcpp::Swap<32, false>::writeval(pov, gdb_index_version);
  pov += 4;
  // (2) Offset of the CU list.
  elfcpp::Swap<32, false>::writeval(pov, gdb_index_hdr_size);
  pov += 4;
  // (3) Offset of the types CU list.
  elfcpp::Swap<32, false>::writeval(pov, this->tu_offset_);
  pov += 4;
  // (4) Offset of the address area.
  elfcpp::Swap<32, false>::writeval(pov, this->addr_offset_);
  pov += 4;
  // (5) Offset of the symbol table.
  elfcpp::Swap<32, false>::writeval(pov, this->symtab_offset_);
  pov += 4;
  // (6) Offset of the constant pool.
  elfcpp::Swap<32, false>::writeval(pov, this->cu_pool_offset_);
  pov += 4;

  gold_assert(pov - oview == gdb_index_hdr_size);

  // Write the CU list.
  unsigned int comp_units_count = this->comp_units_.size();
  for (unsigned int i = 0; i < comp_units_count; ++i)
    {
      const Comp_unit& cu = this->comp_units_[i];
      elfcpp::Swap<64, false>::writeval(pov, cu.cu_offset);
      elfcpp::Swap<64, false>::writeval(pov + 8, cu.cu_length);
      pov += 16;
    }

  gold_assert(pov - oview == this->tu_offset_);

  // Write the types CU list.
  for (unsigned int i = 0; i < this->type_units_.size(); ++i)
    {
      const Type_unit& tu = this->type_units_[i];
      elfcpp::Swap<64, false>::writeval(pov, tu.tu_offset);
      elfcpp::Swap<64, false>::writeval(pov + 8, tu.type_offset);
      elfcpp::Swap<64, false>::writeval(pov + 16, tu.type_signature);
      pov += 24;
    }

  gold_assert(pov - oview == this->addr_offset_);

  // Write the address area.
  for (unsigned int i = 0; i < this->ranges_.size(); ++i)
    {
      int cu_index = this->ranges_[i].cu_index;
      // Translate negative indexes, which refer to a TU, to a
      // logical index into a concatenated CU/TU list.
      if (cu_index < 0)
        cu_index = comp_units_count + (-1 - cu_index);
      Relobj* object = this->ranges_[i].object;
      const Dwarf_range_list& ranges = *this->ranges_[i].ranges;
      for (unsigned int j = 0; j < ranges.size(); ++j)
        {
	  const Dwarf_range_list::Range& range = ranges[j];
	  uint64_t base = 0;
	  if (range.shndx > 0)
	    {
	      const Output_section* os = object->output_section(range.shndx);
	      base = (os->address()
		      + object->output_section_offset(range.shndx));
	    }
	  elfcpp::Swap_aligned32<64, false>::writeval(pov, base + range.start);
	  elfcpp::Swap_aligned32<64, false>::writeval(pov + 8,
						      base + range.end);
	  elfcpp::Swap<32, false>::writeval(pov + 16, cu_index);
	  pov += 20;
	}
    }

  gold_assert(pov - oview == this->symtab_offset_);

  // Write the symbol table.
  for (unsigned int i = 0; i < this->gdb_symtab_->capacity(); ++i)
    {
      const Gdb_symbol* sym = (*this->gdb_symtab_)[i];
      section_offset_type name_offset = 0;
      unsigned int cu_vector_offset = 0;
      if (sym != NULL)
	{
	  name_offset = (this->stringpool_.get_offset_from_key(sym->name_key)
			 + this->stringpool_offset_ - this->cu_pool_offset_);
	  cu_vector_offset = this->cu_vector_offsets_[sym->cu_vector_index];
	}
      elfcpp::Swap<32, false>::writeval(pov, name_offset);
      elfcpp::Swap<32, false>::writeval(pov + 4, cu_vector_offset);
      pov += 8;
    }

  gold_assert(pov - oview == this->cu_pool_offset_);

  // Write the CU vectors into the constant pool.
  for (unsigned int i = 0; i < this->cu_vector_list_.size(); ++i)
    {
      Cu_vector* cu_vec = this->cu_vector_list_[i];
      elfcpp::Swap<32, false>::writeval(pov, cu_vec->size());
      pov += 4;
      for (unsigned int j = 0; j < cu_vec->size(); ++j)
	{
	  int cu_index = (*cu_vec)[j].first;
          uint8_t flags = (*cu_vec)[j].second;
	  if (cu_index < 0)
	    cu_index = comp_units_count + (-1 - cu_index);
          cu_index |= flags << 24;
	  elfcpp::Swap<32, false>::writeval(pov, cu_index);
	  pov += 4;
	}
    }

  gold_assert(pov - oview == this->stringpool_offset_);

  // Write the strings into the constant pool.
  this->stringpool_.write_to_buffer(pov, oview_size - this->stringpool_offset_);

  of->write_output_view(off, oview_size, oview);
}

// Print usage statistics.
void
Gdb_index::print_stats()
{
  if (parameters->options().gdb_index())
    Gdb_index_info_reader::print_stats();
}

} // End namespace gold.