summaryrefslogtreecommitdiff
path: root/gdb/buildsym.c
blob: 0b0f3b3d0fded55be49a693122e3b802e3d79eb6 (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
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
/* Support routines for building symbol tables in GDB's internal format.
   Copyright (C) 1986-2014 Free Software Foundation, Inc.

   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/>.  */

/* This module provides subroutines used for creating and adding to
   the symbol table.  These routines are called from various symbol-
   file-reading routines.

   Routines to support specific debugging information formats (stabs,
   DWARF, etc) belong somewhere else.  */

#include "defs.h"
#include "bfd.h"
#include "gdb_obstack.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbtypes.h"
#include "complaints.h"
#include "expression.h"		/* For "enum exp_opcode" used by...  */
#include "bcache.h"
#include "filenames.h"		/* For DOSish file names.  */
#include "macrotab.h"
#include "demangle.h"		/* Needed by SYMBOL_INIT_DEMANGLED_NAME.  */
#include "block.h"
#include "cp-support.h"
#include "dictionary.h"
#include "addrmap.h"

/* Ask buildsym.h to define the vars it normally declares `extern'.  */
#define	EXTERN
/**/
#include "buildsym.h"		/* Our own declarations.  */
#undef	EXTERN

/* For cleanup_undefined_stabs_types and finish_global_stabs (somewhat
   questionable--see comment where we call them).  */

#include "stabsread.h"

/* The objfile we are currently reading debug info from.  */

static struct objfile *buildsym_objfile;

/* The compilation directory.  */

static char *buildsym_comp_dir;

/* List of subfiles.  */

static struct subfile *subfiles;

/* The "main" subfile.
   In C this is the ".c" file (and similarly for other languages).
   This becomes the "primary" symtab of the compilation unit.  */

static struct subfile *main_subfile;

/* List of free `struct pending' structures for reuse.  */

static struct pending *free_pendings;

/* Non-zero if symtab has line number info.  This prevents an
   otherwise empty symtab from being tossed.  */

static int have_line_numbers;

/* The mutable address map for the compilation unit whose symbols
   we're currently reading.  The symtabs' shared blockvector will
   point to a fixed copy of this.  */
static struct addrmap *pending_addrmap;

/* The obstack on which we allocate pending_addrmap.
   If pending_addrmap is NULL, this is uninitialized; otherwise, it is
   initialized (and holds pending_addrmap).  */
static struct obstack pending_addrmap_obstack;

/* Non-zero if we recorded any ranges in the addrmap that are
   different from those in the blockvector already.  We set this to
   zero when we start processing a symfile, and if it's still zero at
   the end, then we just toss the addrmap.  */
static int pending_addrmap_interesting;

/* An obstack used for allocating pending blocks.  */

static struct obstack pending_block_obstack;

/* List of blocks already made (lexical contexts already closed).
   This is used at the end to make the blockvector.  */

struct pending_block
  {
    struct pending_block *next;
    struct block *block;
  };

/* Pointer to the head of a linked list of symbol blocks which have
   already been finalized (lexical contexts already closed) and which
   are just waiting to be built into a blockvector when finalizing the
   associated symtab.  */

static struct pending_block *pending_blocks;

struct subfile_stack
  {
    struct subfile_stack *next;
    char *name;
  };

static struct subfile_stack *subfile_stack;

/* The macro table for the compilation unit whose symbols we're
   currently reading.  All the symtabs for the CU will point to this.  */
static struct macro_table *pending_macros;

static int compare_line_numbers (const void *ln1p, const void *ln2p);

static void record_pending_block (struct objfile *objfile,
				  struct block *block,
				  struct pending_block *opblock);

/* Initial sizes of data structures.  These are realloc'd larger if
   needed, and realloc'd down to the size actually used, when
   completed.  */

#define	INITIAL_CONTEXT_STACK_SIZE	10
#define	INITIAL_LINE_VECTOR_LENGTH	1000


/* Maintain the lists of symbols and blocks.  */

/* Add a symbol to one of the lists of symbols.  */

void
add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
{
  struct pending *link;

  /* If this is an alias for another symbol, don't add it.  */
  if (symbol->ginfo.name && symbol->ginfo.name[0] == '#')
    return;

  /* We keep PENDINGSIZE symbols in each link of the list.  If we
     don't have a link with room in it, add a new link.  */
  if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE)
    {
      if (free_pendings)
	{
	  link = free_pendings;
	  free_pendings = link->next;
	}
      else
	{
	  link = (struct pending *) xmalloc (sizeof (struct pending));
	}

      link->next = *listhead;
      *listhead = link;
      link->nsyms = 0;
    }

  (*listhead)->symbol[(*listhead)->nsyms++] = symbol;
}

/* Find a symbol named NAME on a LIST.  NAME need not be
   '\0'-terminated; LENGTH is the length of the name.  */

struct symbol *
find_symbol_in_list (struct pending *list, char *name, int length)
{
  int j;
  const char *pp;

  while (list != NULL)
    {
      for (j = list->nsyms; --j >= 0;)
	{
	  pp = SYMBOL_LINKAGE_NAME (list->symbol[j]);
	  if (*pp == *name && strncmp (pp, name, length) == 0
	      && pp[length] == '\0')
	    {
	      return (list->symbol[j]);
	    }
	}
      list = list->next;
    }
  return (NULL);
}

/* At end of reading syms, or in case of quit, really free as many
   `struct pending's as we can easily find.  */

void
really_free_pendings (void *dummy)
{
  struct pending *next, *next1;

  for (next = free_pendings; next; next = next1)
    {
      next1 = next->next;
      xfree ((void *) next);
    }
  free_pendings = NULL;

  free_pending_blocks ();

  for (next = file_symbols; next != NULL; next = next1)
    {
      next1 = next->next;
      xfree ((void *) next);
    }
  file_symbols = NULL;

  for (next = global_symbols; next != NULL; next = next1)
    {
      next1 = next->next;
      xfree ((void *) next);
    }
  global_symbols = NULL;

  if (pending_macros)
    free_macro_table (pending_macros);

  if (pending_addrmap)
    {
      obstack_free (&pending_addrmap_obstack, NULL);
      pending_addrmap = NULL;
    }
}

/* This function is called to discard any pending blocks.  */

void
free_pending_blocks (void)
{
  if (pending_blocks != NULL)
    {
      obstack_free (&pending_block_obstack, NULL);
      pending_blocks = NULL;
    }
}

/* Take one of the lists of symbols and make a block from it.  Keep
   the order the symbols have in the list (reversed from the input
   file).  Put the block on the list of pending blocks.  */

static struct block *
finish_block_internal (struct symbol *symbol, struct pending **listhead,
		       struct pending_block *old_blocks,
		       CORE_ADDR start, CORE_ADDR end,
		       int is_global, int expandable)
{
  struct objfile *objfile = buildsym_objfile;
  struct gdbarch *gdbarch = get_objfile_arch (objfile);
  struct pending *next, *next1;
  struct block *block;
  struct pending_block *pblock;
  struct pending_block *opblock;

  block = (is_global
	   ? allocate_global_block (&objfile->objfile_obstack)
	   : allocate_block (&objfile->objfile_obstack));

  if (symbol)
    {
      BLOCK_DICT (block) = dict_create_linear (&objfile->objfile_obstack,
					       *listhead);
    }
  else
    {
      if (expandable)
	{
	  BLOCK_DICT (block) = dict_create_hashed_expandable ();
	  dict_add_pending (BLOCK_DICT (block), *listhead);
	}
      else
	{
	  BLOCK_DICT (block) =
	    dict_create_hashed (&objfile->objfile_obstack, *listhead);
	}
    }

  BLOCK_START (block) = start;
  BLOCK_END (block) = end;

  /* Put the block in as the value of the symbol that names it.  */

  if (symbol)
    {
      struct type *ftype = SYMBOL_TYPE (symbol);
      struct dict_iterator iter;
      SYMBOL_BLOCK_VALUE (symbol) = block;
      BLOCK_FUNCTION (block) = symbol;

      if (TYPE_NFIELDS (ftype) <= 0)
	{
	  /* No parameter type information is recorded with the
	     function's type.  Set that from the type of the
	     parameter symbols.  */
	  int nparams = 0, iparams;
	  struct symbol *sym;

	  /* Here we want to directly access the dictionary, because
	     we haven't fully initialized the block yet.  */
	  ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
	    {
	      if (SYMBOL_IS_ARGUMENT (sym))
		nparams++;
	    }
	  if (nparams > 0)
	    {
	      TYPE_NFIELDS (ftype) = nparams;
	      TYPE_FIELDS (ftype) = (struct field *)
		TYPE_ALLOC (ftype, nparams * sizeof (struct field));

	      iparams = 0;
	      /* Here we want to directly access the dictionary, because
		 we haven't fully initialized the block yet.  */
	      ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
		{
		  if (iparams == nparams)
		    break;

		  if (SYMBOL_IS_ARGUMENT (sym))
		    {
		      TYPE_FIELD_TYPE (ftype, iparams) = SYMBOL_TYPE (sym);
		      TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
		      iparams++;
		    }
		}
	    }
	}
    }
  else
    {
      BLOCK_FUNCTION (block) = NULL;
    }

  /* Now "free" the links of the list, and empty the list.  */

  for (next = *listhead; next; next = next1)
    {
      next1 = next->next;
      next->next = free_pendings;
      free_pendings = next;
    }
  *listhead = NULL;

  /* Check to be sure that the blocks have an end address that is
     greater than starting address.  */

  if (BLOCK_END (block) < BLOCK_START (block))
    {
      if (symbol)
	{
	  complaint (&symfile_complaints,
		     _("block end address less than block "
		       "start address in %s (patched it)"),
		     SYMBOL_PRINT_NAME (symbol));
	}
      else
	{
	  complaint (&symfile_complaints,
		     _("block end address %s less than block "
		       "start address %s (patched it)"),
		     paddress (gdbarch, BLOCK_END (block)),
		     paddress (gdbarch, BLOCK_START (block)));
	}
      /* Better than nothing.  */
      BLOCK_END (block) = BLOCK_START (block);
    }

  /* Install this block as the superblock of all blocks made since the
     start of this scope that don't have superblocks yet.  */

  opblock = NULL;
  for (pblock = pending_blocks; 
       pblock && pblock != old_blocks; 
       pblock = pblock->next)
    {
      if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
	{
	  /* Check to be sure the blocks are nested as we receive
	     them.  If the compiler/assembler/linker work, this just
	     burns a small amount of time.

	     Skip blocks which correspond to a function; they're not
	     physically nested inside this other blocks, only
	     lexically nested.  */
	  if (BLOCK_FUNCTION (pblock->block) == NULL
	      && (BLOCK_START (pblock->block) < BLOCK_START (block)
		  || BLOCK_END (pblock->block) > BLOCK_END (block)))
	    {
	      if (symbol)
		{
		  complaint (&symfile_complaints,
			     _("inner block not inside outer block in %s"),
			     SYMBOL_PRINT_NAME (symbol));
		}
	      else
		{
		  complaint (&symfile_complaints,
			     _("inner block (%s-%s) not "
			       "inside outer block (%s-%s)"),
			     paddress (gdbarch, BLOCK_START (pblock->block)),
			     paddress (gdbarch, BLOCK_END (pblock->block)),
			     paddress (gdbarch, BLOCK_START (block)),
			     paddress (gdbarch, BLOCK_END (block)));
		}
	      if (BLOCK_START (pblock->block) < BLOCK_START (block))
		BLOCK_START (pblock->block) = BLOCK_START (block);
	      if (BLOCK_END (pblock->block) > BLOCK_END (block))
		BLOCK_END (pblock->block) = BLOCK_END (block);
	    }
	  BLOCK_SUPERBLOCK (pblock->block) = block;
	}
      opblock = pblock;
    }

  block_set_using (block, using_directives, &objfile->objfile_obstack);
  using_directives = NULL;

  record_pending_block (objfile, block, opblock);

  return block;
}

struct block *
finish_block (struct symbol *symbol, struct pending **listhead,
	      struct pending_block *old_blocks,
	      CORE_ADDR start, CORE_ADDR end)
{
  return finish_block_internal (symbol, listhead, old_blocks,
				start, end, 0, 0);
}

/* Record BLOCK on the list of all blocks in the file.  Put it after
   OPBLOCK, or at the beginning if opblock is NULL.  This puts the
   block in the list after all its subblocks.

   Allocate the pending block struct in the objfile_obstack to save
   time.  This wastes a little space.  FIXME: Is it worth it?  */

static void
record_pending_block (struct objfile *objfile, struct block *block,
		      struct pending_block *opblock)
{
  struct pending_block *pblock;

  if (pending_blocks == NULL)
    obstack_init (&pending_block_obstack);

  pblock = (struct pending_block *)
    obstack_alloc (&pending_block_obstack, sizeof (struct pending_block));
  pblock->block = block;
  if (opblock)
    {
      pblock->next = opblock->next;
      opblock->next = pblock;
    }
  else
    {
      pblock->next = pending_blocks;
      pending_blocks = pblock;
    }
}


/* Record that the range of addresses from START to END_INCLUSIVE
   (inclusive, like it says) belongs to BLOCK.  BLOCK's start and end
   addresses must be set already.  You must apply this function to all
   BLOCK's children before applying it to BLOCK.

   If a call to this function complicates the picture beyond that
   already provided by BLOCK_START and BLOCK_END, then we create an
   address map for the block.  */
void
record_block_range (struct block *block,
                    CORE_ADDR start, CORE_ADDR end_inclusive)
{
  /* If this is any different from the range recorded in the block's
     own BLOCK_START and BLOCK_END, then note that the address map has
     become interesting.  Note that even if this block doesn't have
     any "interesting" ranges, some later block might, so we still
     need to record this block in the addrmap.  */
  if (start != BLOCK_START (block)
      || end_inclusive + 1 != BLOCK_END (block))
    pending_addrmap_interesting = 1;

  if (! pending_addrmap)
    {
      obstack_init (&pending_addrmap_obstack);
      pending_addrmap = addrmap_create_mutable (&pending_addrmap_obstack);
    }

  addrmap_set_empty (pending_addrmap, start, end_inclusive, block);
}


static struct blockvector *
make_blockvector (struct objfile *objfile)
{
  struct pending_block *next;
  struct blockvector *blockvector;
  int i;

  /* Count the length of the list of blocks.  */

  for (next = pending_blocks, i = 0; next; next = next->next, i++)
    {;
    }

  blockvector = (struct blockvector *)
    obstack_alloc (&objfile->objfile_obstack,
		   (sizeof (struct blockvector)
		    + (i - 1) * sizeof (struct block *)));

  /* Copy the blocks into the blockvector.  This is done in reverse
     order, which happens to put the blocks into the proper order
     (ascending starting address).  finish_block has hair to insert
     each block into the list after its subblocks in order to make
     sure this is true.  */

  BLOCKVECTOR_NBLOCKS (blockvector) = i;
  for (next = pending_blocks; next; next = next->next)
    {
      BLOCKVECTOR_BLOCK (blockvector, --i) = next->block;
    }

  free_pending_blocks ();

  /* If we needed an address map for this symtab, record it in the
     blockvector.  */
  if (pending_addrmap && pending_addrmap_interesting)
    BLOCKVECTOR_MAP (blockvector)
      = addrmap_create_fixed (pending_addrmap, &objfile->objfile_obstack);
  else
    BLOCKVECTOR_MAP (blockvector) = 0;

  /* Some compilers output blocks in the wrong order, but we depend on
     their being in the right order so we can binary search.  Check the
     order and moan about it.
     Note: Remember that the first two blocks are the global and static
     blocks.  We could special case that fact and begin checking at block 2.
     To avoid making that assumption we do not.  */
  if (BLOCKVECTOR_NBLOCKS (blockvector) > 1)
    {
      for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++)
	{
	  if (BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i - 1))
	      > BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i)))
	    {
	      CORE_ADDR start
		= BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i));

	      complaint (&symfile_complaints, _("block at %s out of order"),
			 hex_string ((LONGEST) start));
	    }
	}
    }

  return (blockvector);
}

/* Start recording information about source code that came from an
   included (or otherwise merged-in) source file with a different
   name.  NAME is the name of the file (cannot be NULL).  */

void
start_subfile (const char *name)
{
  struct subfile *subfile;

  /* See if this subfile is already known as a subfile of the current
     main source file.  */

  for (subfile = subfiles; subfile; subfile = subfile->next)
    {
      char *subfile_name;

      /* If NAME is an absolute path, and this subfile is not, then
	 attempt to create an absolute path to compare.  */
      if (IS_ABSOLUTE_PATH (name)
	  && !IS_ABSOLUTE_PATH (subfile->name)
	  && subfile->dirname != NULL)
	subfile_name = concat (subfile->dirname, SLASH_STRING,
			       subfile->name, (char *) NULL);
      else
	subfile_name = subfile->name;

      if (FILENAME_CMP (subfile_name, name) == 0)
	{
	  current_subfile = subfile;
	  if (subfile_name != subfile->name)
	    xfree (subfile_name);
	  return;
	}
      if (subfile_name != subfile->name)
	xfree (subfile_name);
    }

  /* This subfile is not known.  Add an entry for it.  Make an entry
     for this subfile in the list of all subfiles of the current main
     source file.  */

  subfile = (struct subfile *) xmalloc (sizeof (struct subfile));
  memset ((char *) subfile, 0, sizeof (struct subfile));
  subfile->next = subfiles;
  subfiles = subfile;
  current_subfile = subfile;

  /* Save its name and compilation directory name.  */
  subfile->name = xstrdup (name);
  subfile->dirname
    = (buildsym_comp_dir == NULL) ? NULL : xstrdup (buildsym_comp_dir);

  /* Initialize line-number recording for this subfile.  */
  subfile->line_vector = NULL;

  /* Default the source language to whatever can be deduced from the
     filename.  If nothing can be deduced (such as for a C/C++ include
     file with a ".h" extension), then inherit whatever language the
     previous subfile had.  This kludgery is necessary because there
     is no standard way in some object formats to record the source
     language.  Also, when symtabs are allocated we try to deduce a
     language then as well, but it is too late for us to use that
     information while reading symbols, since symtabs aren't allocated
     until after all the symbols have been processed for a given
     source file.  */

  subfile->language = deduce_language_from_filename (subfile->name);
  if (subfile->language == language_unknown
      && subfile->next != NULL)
    {
      subfile->language = subfile->next->language;
    }

  /* Initialize the debug format string to NULL.  We may supply it
     later via a call to record_debugformat.  */
  subfile->debugformat = NULL;

  /* Similarly for the producer.  */
  subfile->producer = NULL;

  /* If the filename of this subfile ends in .C, then change the
     language of any pending subfiles from C to C++.  We also accept
     any other C++ suffixes accepted by deduce_language_from_filename.  */
  /* Likewise for f2c.  */

  if (subfile->name)
    {
      struct subfile *s;
      enum language sublang = deduce_language_from_filename (subfile->name);

      if (sublang == language_cplus || sublang == language_fortran)
	for (s = subfiles; s != NULL; s = s->next)
	  if (s->language == language_c)
	    s->language = sublang;
    }

  /* And patch up this file if necessary.  */
  if (subfile->language == language_c
      && subfile->next != NULL
      && (subfile->next->language == language_cplus
	  || subfile->next->language == language_fortran))
    {
      subfile->language = subfile->next->language;
    }
}

/* Delete the subfiles list.  */

static void
free_subfiles_list (void)
{
  struct subfile *subfile, *nextsub;

  for (subfile = subfiles; subfile != NULL; subfile = nextsub)
    {
      nextsub = subfile->next;
      xfree (subfile->name);
      xfree (subfile->dirname);
      xfree (subfile->line_vector);
      xfree (subfile);
    }
  subfiles = NULL;
  current_subfile = NULL;
  main_subfile = NULL;
}

/* For stabs readers, the first N_SO symbol is assumed to be the
   source file name, and the subfile struct is initialized using that
   assumption.  If another N_SO symbol is later seen, immediately
   following the first one, then the first one is assumed to be the
   directory name and the second one is really the source file name.

   So we have to patch up the subfile struct by moving the old name
   value to dirname and remembering the new name.  Some sanity
   checking is performed to ensure that the state of the subfile
   struct is reasonable and that the old name we are assuming to be a
   directory name actually is (by checking for a trailing '/').  */

void
patch_subfile_names (struct subfile *subfile, char *name)
{
  if (subfile != NULL && subfile->dirname == NULL && subfile->name != NULL
      && IS_DIR_SEPARATOR (subfile->name[strlen (subfile->name) - 1]))
    {
      /* With correct debug info, buildsym_comp_dir should be NULL since
	 subfile->dirname is NULL.  However, don't assume this.  */
      xfree (buildsym_comp_dir);
      buildsym_comp_dir = xstrdup (subfile->name);

      subfile->dirname = subfile->name;
      subfile->name = xstrdup (name);
      set_last_source_file (name);

      /* Default the source language to whatever can be deduced from
         the filename.  If nothing can be deduced (such as for a C/C++
         include file with a ".h" extension), then inherit whatever
         language the previous subfile had.  This kludgery is
         necessary because there is no standard way in some object
         formats to record the source language.  Also, when symtabs
         are allocated we try to deduce a language then as well, but
         it is too late for us to use that information while reading
         symbols, since symtabs aren't allocated until after all the
         symbols have been processed for a given source file.  */

      subfile->language = deduce_language_from_filename (subfile->name);
      if (subfile->language == language_unknown
	  && subfile->next != NULL)
	{
	  subfile->language = subfile->next->language;
	}
    }
}

/* Handle the N_BINCL and N_EINCL symbol types that act like N_SOL for
   switching source files (different subfiles, as we call them) within
   one object file, but using a stack rather than in an arbitrary
   order.  */

void
push_subfile (void)
{
  struct subfile_stack *tem
    = (struct subfile_stack *) xmalloc (sizeof (struct subfile_stack));

  tem->next = subfile_stack;
  subfile_stack = tem;
  if (current_subfile == NULL || current_subfile->name == NULL)
    {
      internal_error (__FILE__, __LINE__, 
		      _("failed internal consistency check"));
    }
  tem->name = current_subfile->name;
}

char *
pop_subfile (void)
{
  char *name;
  struct subfile_stack *link = subfile_stack;

  if (link == NULL)
    {
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }
  name = link->name;
  subfile_stack = link->next;
  xfree ((void *) link);
  return (name);
}

/* Add a linetable entry for line number LINE and address PC to the
   line vector for SUBFILE.  */

void
record_line (struct subfile *subfile, int line, CORE_ADDR pc)
{
  struct linetable_entry *e;

  /* Ignore the dummy line number in libg.o */
  if (line == 0xffff)
    {
      return;
    }

  /* Make sure line vector exists and is big enough.  */
  if (!subfile->line_vector)
    {
      subfile->line_vector_length = INITIAL_LINE_VECTOR_LENGTH;
      subfile->line_vector = (struct linetable *)
	xmalloc (sizeof (struct linetable)
	   + subfile->line_vector_length * sizeof (struct linetable_entry));
      subfile->line_vector->nitems = 0;
      have_line_numbers = 1;
    }

  if (subfile->line_vector->nitems + 1 >= subfile->line_vector_length)
    {
      subfile->line_vector_length *= 2;
      subfile->line_vector = (struct linetable *)
	xrealloc ((char *) subfile->line_vector,
		  (sizeof (struct linetable)
		   + (subfile->line_vector_length
		      * sizeof (struct linetable_entry))));
    }

  /* Normally, we treat lines as unsorted.  But the end of sequence
     marker is special.  We sort line markers at the same PC by line
     number, so end of sequence markers (which have line == 0) appear
     first.  This is right if the marker ends the previous function,
     and there is no padding before the next function.  But it is
     wrong if the previous line was empty and we are now marking a
     switch to a different subfile.  We must leave the end of sequence
     marker at the end of this group of lines, not sort the empty line
     to after the marker.  The easiest way to accomplish this is to
     delete any empty lines from our table, if they are followed by
     end of sequence markers.  All we lose is the ability to set
     breakpoints at some lines which contain no instructions
     anyway.  */
  if (line == 0 && subfile->line_vector->nitems > 0)
    {
      e = subfile->line_vector->item + subfile->line_vector->nitems - 1;
      while (subfile->line_vector->nitems > 0 && e->pc == pc)
	{
	  e--;
	  subfile->line_vector->nitems--;
	}
    }

  e = subfile->line_vector->item + subfile->line_vector->nitems++;
  e->line = line;
  e->pc = pc;
}

/* Needed in order to sort line tables from IBM xcoff files.  Sigh!  */

static int
compare_line_numbers (const void *ln1p, const void *ln2p)
{
  struct linetable_entry *ln1 = (struct linetable_entry *) ln1p;
  struct linetable_entry *ln2 = (struct linetable_entry *) ln2p;

  /* Note: this code does not assume that CORE_ADDRs can fit in ints.
     Please keep it that way.  */
  if (ln1->pc < ln2->pc)
    return -1;

  if (ln1->pc > ln2->pc)
    return 1;

  /* If pc equal, sort by line.  I'm not sure whether this is optimum
     behavior (see comment at struct linetable in symtab.h).  */
  return ln1->line - ln2->line;
}

/* Return the macro table.
   Initialize it if this is the first use.
   It is only valid to call this between calls to start_symtab and the
   end_symtab* functions.  */

struct macro_table *
get_macro_table (const char *comp_dir)
{
  struct objfile *objfile = buildsym_objfile;

  if (! pending_macros)
    pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
				      objfile->per_bfd->macro_cache,
				      comp_dir);
  return pending_macros;
}

/* Start a new symtab for a new source file in OBJFILE.  Called, for example,
   when a stabs symbol of type N_SO is seen, or when a DWARF
   TAG_compile_unit DIE is seen.  It indicates the start of data for
   one original source file.

   NAME is the name of the file (cannot be NULL).  COMP_DIR is the directory in
   which the file was compiled (or NULL if not known).  START_ADDR is the
   lowest address of objects in the file (or 0 if not known).  */

void
start_symtab (struct objfile *objfile, const char *name, const char *comp_dir,
	      CORE_ADDR start_addr)
{
  buildsym_objfile = objfile;
  buildsym_comp_dir = comp_dir != NULL ? xstrdup (comp_dir) : NULL;
  restart_symtab (start_addr);
  set_last_source_file (name);
  start_subfile (name);
  /* Save this so that we don't have to go looking for it at the end
     of the subfiles list.  */
  main_subfile = current_subfile;
}

/* Restart compilation for a symtab.
   This is used when a symtab is built from multiple sources.
   The symtab is first built with start_symtab and then for each additional
   piece call restart_symtab.  */

void
restart_symtab (CORE_ADDR start_addr)
{
  set_last_source_file (NULL);
  last_source_start_addr = start_addr;
  file_symbols = NULL;
  global_symbols = NULL;
  within_function = 0;
  have_line_numbers = 0;

  /* Context stack is initially empty.  Allocate first one with room
     for 10 levels; reuse it forever afterward.  */
  if (context_stack == NULL)
    {
      context_stack_size = INITIAL_CONTEXT_STACK_SIZE;
      context_stack = (struct context_stack *)
	xmalloc (context_stack_size * sizeof (struct context_stack));
    }
  context_stack_depth = 0;

  /* We shouldn't have any address map at this point.  */
  gdb_assert (! pending_addrmap);

  /* Reset the sub source files list.  The list should already be empty,
     but free it anyway in case some code didn't finish cleaning up after
     an error.  */
  free_subfiles_list ();
}

/* Subroutine of end_symtab to simplify it.  Look for a subfile that
   matches the main source file's basename.  If there is only one, and
   if the main source file doesn't have any symbol or line number
   information, then copy this file's symtab and line_vector to the
   main source file's subfile and discard the other subfile.  This can
   happen because of a compiler bug or from the user playing games
   with #line or from things like a distributed build system that
   manipulates the debug info.  */

static void
watch_main_source_file_lossage (void)
{
  struct subfile *subfile;

  /* We have to watch for mainsub == NULL here.  It's a quirk of
     end_symtab, it can return NULL so there may not be a main subfile.  */
  if (main_subfile == NULL)
    return;

  /* If the main source file doesn't have any line number or symbol
     info, look for an alias in another subfile.  */

  if (main_subfile->line_vector == NULL
      && main_subfile->symtab == NULL)
    {
      const char *mainbase = lbasename (main_subfile->name);
      int nr_matches = 0;
      struct subfile *prevsub;
      struct subfile *mainsub_alias = NULL;
      struct subfile *prev_mainsub_alias = NULL;

      prevsub = NULL;
      for (subfile = subfiles;
	   /* Stop before we get to the last one.  */
	   subfile->next;
	   subfile = subfile->next)
	{
	  if (filename_cmp (lbasename (subfile->name), mainbase) == 0)
	    {
	      ++nr_matches;
	      mainsub_alias = subfile;
	      prev_mainsub_alias = prevsub;
	    }
	  prevsub = subfile;
	}

      if (nr_matches == 1)
	{
	  gdb_assert (mainsub_alias != NULL && mainsub_alias != main_subfile);

	  /* Found a match for the main source file.
	     Copy its line_vector and symtab to the main subfile
	     and then discard it.  */

	  main_subfile->line_vector = mainsub_alias->line_vector;
	  main_subfile->line_vector_length = mainsub_alias->line_vector_length;
	  main_subfile->symtab = mainsub_alias->symtab;

	  if (prev_mainsub_alias == NULL)
	    subfiles = mainsub_alias->next;
	  else
	    prev_mainsub_alias->next = mainsub_alias->next;
	  xfree (mainsub_alias->name);
	  xfree (mainsub_alias->dirname);
	  xfree (mainsub_alias);
	}
    }
}

/* Helper function for qsort.  Parameters are `struct block *' pointers,
   function sorts them in descending order by their BLOCK_START.  */

static int
block_compar (const void *ap, const void *bp)
{
  const struct block *a = *(const struct block **) ap;
  const struct block *b = *(const struct block **) bp;

  return ((BLOCK_START (b) > BLOCK_START (a))
	  - (BLOCK_START (b) < BLOCK_START (a)));
}

/* Reset globals used to build symtabs.  */

static void
reset_symtab_globals (void)
{
  buildsym_objfile = NULL;
  xfree (buildsym_comp_dir);
  buildsym_comp_dir = NULL;
  set_last_source_file (NULL);
  free_subfiles_list ();
  pending_macros = NULL;
  if (pending_addrmap)
    {
      obstack_free (&pending_addrmap_obstack, NULL);
      pending_addrmap = NULL;
    }
}

/* Implementation of the first part of end_symtab.  It allows modifying
   STATIC_BLOCK before it gets finalized by end_symtab_from_static_block.
   If the returned value is NULL there is no blockvector created for
   this symtab (you still must call end_symtab_from_static_block).

   END_ADDR is the same as for end_symtab: the address of the end of the
   file's text.

   If EXPANDABLE is non-zero the STATIC_BLOCK dictionary is made
   expandable.

   If REQUIRED is non-zero, then a symtab is created even if it does
   not contain any symbols.  */

struct block *
end_symtab_get_static_block (CORE_ADDR end_addr, int expandable, int required)
{
  struct objfile *objfile = buildsym_objfile;

  /* Finish the lexical context of the last function in the file; pop
     the context stack.  */

  if (context_stack_depth > 0)
    {
      struct context_stack *cstk = pop_context ();

      /* Make a block for the local symbols within.  */
      finish_block (cstk->name, &local_symbols, cstk->old_blocks,
		    cstk->start_addr, end_addr);

      if (context_stack_depth > 0)
	{
	  /* This is said to happen with SCO.  The old coffread.c
	     code simply emptied the context stack, so we do the
	     same.  FIXME: Find out why it is happening.  This is not
	     believed to happen in most cases (even for coffread.c);
	     it used to be an abort().  */
	  complaint (&symfile_complaints,
	             _("Context stack not empty in end_symtab"));
	  context_stack_depth = 0;
	}
    }

  /* Reordered executables may have out of order pending blocks; if
     OBJF_REORDERED is true, then sort the pending blocks.  */

  if ((objfile->flags & OBJF_REORDERED) && pending_blocks)
    {
      unsigned count = 0;
      struct pending_block *pb;
      struct block **barray, **bp;
      struct cleanup *back_to;

      for (pb = pending_blocks; pb != NULL; pb = pb->next)
	count++;

      barray = xmalloc (sizeof (*barray) * count);
      back_to = make_cleanup (xfree, barray);

      bp = barray;
      for (pb = pending_blocks; pb != NULL; pb = pb->next)
	*bp++ = pb->block;

      qsort (barray, count, sizeof (*barray), block_compar);

      bp = barray;
      for (pb = pending_blocks; pb != NULL; pb = pb->next)
	pb->block = *bp++;

      do_cleanups (back_to);
    }

  /* Cleanup any undefined types that have been left hanging around
     (this needs to be done before the finish_blocks so that
     file_symbols is still good).

     Both cleanup_undefined_stabs_types and finish_global_stabs are stabs
     specific, but harmless for other symbol readers, since on gdb
     startup or when finished reading stabs, the state is set so these
     are no-ops.  FIXME: Is this handled right in case of QUIT?  Can
     we make this cleaner?  */

  cleanup_undefined_stabs_types (objfile);
  finish_global_stabs (objfile);

  if (!required
      && pending_blocks == NULL
      && file_symbols == NULL
      && global_symbols == NULL
      && have_line_numbers == 0
      && pending_macros == NULL)
    {
      /* Ignore symtabs that have no functions with real debugging info.  */
      return NULL;
    }
  else
    {
      /* Define the STATIC_BLOCK.  */
      return finish_block_internal (NULL, &file_symbols, NULL,
				    last_source_start_addr, end_addr,
				    0, expandable);
    }
}

/* Subroutine of end_symtab_from_static_block to simplify it.
   Handle the "no blockvector" case.
   When this happens there is nothing to record, so just free up
   any memory we allocated while reading debug info.  */

static void
end_symtab_without_blockvector (void)
{
  struct objfile *objfile = buildsym_objfile;
  struct subfile *subfile;

  /* Since we are ignoring these subfiles, we also need
     to unlink the associated empty symtab that we created.
     Otherwise, we can run into trouble because various parts
     such as the block-vector are uninitialized whereas
     the rest of the code assumes that they are.

     We can only unlink the symtab.  We can't free it because
     it was allocated on the objfile obstack.  */

  for (subfile = subfiles; subfile != NULL; subfile = subfile->next)
    {
      if (subfile->symtab)
	{
	  struct symtab *s;

	  if (objfile->symtabs == subfile->symtab)
	    objfile->symtabs = objfile->symtabs->next;
	  else
	    ALL_OBJFILE_SYMTABS (objfile, s)
	      if (s->next == subfile->symtab)
		{
		  s->next = s->next->next;
		  break;
		}
	  subfile->symtab = NULL;
	}
    }
}

/* Subroutine of end_symtab_from_static_block to simplify it.
   Handle the "have blockvector" case.
   See end_symtab_from_static_block for a description of the arguments.  */

static struct symtab *
end_symtab_with_blockvector (struct block *static_block,
			     int section, int expandable)
{
  struct objfile *objfile = buildsym_objfile;
  struct symtab *symtab;
  struct blockvector *blockvector;
  struct subfile *subfile;
  CORE_ADDR end_addr;

  gdb_assert (static_block != NULL);
  gdb_assert (subfiles != NULL);

  end_addr = BLOCK_END (static_block);

  /* Create the GLOBAL_BLOCK and build the blockvector.  */
  finish_block_internal (NULL, &global_symbols, NULL,
			 last_source_start_addr, end_addr,
			 1, expandable);
  blockvector = make_blockvector (objfile);

  /* Read the line table if it has to be read separately.
     This is only used by xcoffread.c.  */
  if (objfile->sf->sym_read_linetable != NULL)
    objfile->sf->sym_read_linetable (objfile);

  /* Handle the case where the debug info specifies a different path
     for the main source file.  It can cause us to lose track of its
     line number information.  */
  watch_main_source_file_lossage ();

  /* Now create the symtab objects proper, one for each subfile.  */

  for (subfile = subfiles; subfile != NULL; subfile = subfile->next)
    {
      int linetablesize = 0;

      if (subfile->line_vector)
	{
	  linetablesize = sizeof (struct linetable) +
	    subfile->line_vector->nitems * sizeof (struct linetable_entry);

	  /* Like the pending blocks, the line table may be
	     scrambled in reordered executables.  Sort it if
	     OBJF_REORDERED is true.  */
	  if (objfile->flags & OBJF_REORDERED)
	    qsort (subfile->line_vector->item,
		   subfile->line_vector->nitems,
		   sizeof (struct linetable_entry), compare_line_numbers);
	}

      /* Allocate a symbol table if necessary.  */
      if (subfile->symtab == NULL)
	subfile->symtab = allocate_symtab (subfile->name, objfile);
      symtab = subfile->symtab;

      /* Fill in its components.  */
      symtab->blockvector = blockvector;
      symtab->macro_table = pending_macros;
      if (subfile->line_vector)
	{
	  /* Reallocate the line table on the symbol obstack.  */
	  SYMTAB_LINETABLE (symtab) = (struct linetable *)
	    obstack_alloc (&objfile->objfile_obstack, linetablesize);
	  memcpy (SYMTAB_LINETABLE (symtab), subfile->line_vector,
		  linetablesize);
	}
      else
	{
	  SYMTAB_LINETABLE (symtab) = NULL;
	}
      symtab->block_line_section = section;
      if (subfile->dirname)
	{
	  /* Reallocate the dirname on the symbol obstack.  */
	  SYMTAB_DIRNAME (symtab) =
	    obstack_copy0 (&objfile->objfile_obstack,
			   subfile->dirname,
			   strlen (subfile->dirname));
	}
      else
	{
	  SYMTAB_DIRNAME (symtab) = NULL;
	}

      /* Use whatever language we have been using for this
	 subfile, not the one that was deduced in allocate_symtab
	 from the filename.  We already did our own deducing when
	 we created the subfile, and we may have altered our
	 opinion of what language it is from things we found in
	 the symbols.  */
      symtab->language = subfile->language;

      /* Save the debug format string (if any) in the symtab.  */
      symtab->debugformat = subfile->debugformat;

      /* Similarly for the producer.  */
      symtab->producer = subfile->producer;

      /* All symtabs for the main file and the subfiles share a
	 blockvector, so we need to clear primary for everything
	 but the main file.  */
      set_symtab_primary (symtab, 0);
    }

  /* The main source file is the primary symtab.  */
  gdb_assert (main_subfile->symtab != NULL);
  symtab = main_subfile->symtab;
  set_symtab_primary (symtab, 1);
  {
    struct block *b = BLOCKVECTOR_BLOCK (symtab->blockvector, GLOBAL_BLOCK);

    set_block_symtab (b, symtab);
  }

  /* Default any symbols without a specified symtab to the primary symtab.  */
  {
    int block_i;

    for (block_i = 0; block_i < BLOCKVECTOR_NBLOCKS (blockvector); block_i++)
      {
	struct block *block = BLOCKVECTOR_BLOCK (blockvector, block_i);
	struct symbol *sym;
	struct dict_iterator iter;

	/* Inlined functions may have symbols not in the global or
	   static symbol lists.  */
	if (BLOCK_FUNCTION (block) != NULL)
	  if (SYMBOL_SYMTAB (BLOCK_FUNCTION (block)) == NULL)
	    SYMBOL_SYMTAB (BLOCK_FUNCTION (block)) = symtab;

	/* Note that we only want to fix up symbols from the local
	   blocks, not blocks coming from included symtabs.  That is why
	   we use ALL_DICT_SYMBOLS here and not ALL_BLOCK_SYMBOLS.  */
	ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
	  if (SYMBOL_SYMTAB (sym) == NULL)
	    SYMBOL_SYMTAB (sym) = symtab;
      }
  }

  return symtab;
}

/* Implementation of the second part of end_symtab.  Pass STATIC_BLOCK
   as value returned by end_symtab_get_static_block.

   SECTION is the same as for end_symtab: the section number
   (in objfile->section_offsets) of the blockvector and linetable.

   If EXPANDABLE is non-zero the GLOBAL_BLOCK dictionary is made
   expandable.  */

struct symtab *
end_symtab_from_static_block (struct block *static_block,
			      int section, int expandable)
{
  struct symtab *s;

  if (static_block == NULL)
    {
      end_symtab_without_blockvector ();
      s = NULL;
    }
  else
    s = end_symtab_with_blockvector (static_block, section, expandable);

  reset_symtab_globals ();

  return s;
}

/* Finish the symbol definitions for one main source file, close off
   all the lexical contexts for that file (creating struct block's for
   them), then make the struct symtab for that file and put it in the
   list of all such.

   END_ADDR is the address of the end of the file's text.  SECTION is
   the section number (in objfile->section_offsets) of the blockvector
   and linetable.

   Note that it is possible for end_symtab() to return NULL.  In
   particular, for the DWARF case at least, it will return NULL when
   it finds a compilation unit that has exactly one DIE, a
   TAG_compile_unit DIE.  This can happen when we link in an object
   file that was compiled from an empty source file.  Returning NULL
   is probably not the correct thing to do, because then gdb will
   never know about this empty file (FIXME).

   If you need to modify STATIC_BLOCK before it is finalized you should
   call end_symtab_get_static_block and end_symtab_from_static_block
   yourself.  */

struct symtab *
end_symtab (CORE_ADDR end_addr, int section)
{
  struct block *static_block;

  static_block = end_symtab_get_static_block (end_addr, 0, 0);
  return end_symtab_from_static_block (static_block, section, 0);
}

/* Same as end_symtab except create a symtab that can be later added to.  */

struct symtab *
end_expandable_symtab (CORE_ADDR end_addr, int section)
{
  struct block *static_block;

  static_block = end_symtab_get_static_block (end_addr, 1, 0);
  return end_symtab_from_static_block (static_block, section, 1);
}

/* Subroutine of augment_type_symtab to simplify it.
   Attach SYMTAB to all symbols in PENDING_LIST that don't have one.  */

static void
set_missing_symtab (struct pending *pending_list, struct symtab *symtab)
{
  struct pending *pending;
  int i;

  for (pending = pending_list; pending != NULL; pending = pending->next)
    {
      for (i = 0; i < pending->nsyms; ++i)
	{
	  if (SYMBOL_SYMTAB (pending->symbol[i]) == NULL)
	    SYMBOL_SYMTAB (pending->symbol[i]) = symtab;
	}
    }
}

/* Same as end_symtab, but for the case where we're adding more symbols
   to an existing symtab that is known to contain only type information.
   This is the case for DWARF4 Type Units.  */

void
augment_type_symtab (struct symtab *primary_symtab)
{
  const struct blockvector *blockvector = primary_symtab->blockvector;

  if (context_stack_depth > 0)
    {
      complaint (&symfile_complaints,
		 _("Context stack not empty in augment_type_symtab"));
      context_stack_depth = 0;
    }
  if (pending_blocks != NULL)
    complaint (&symfile_complaints, _("Blocks in a type symtab"));
  if (pending_macros != NULL)
    complaint (&symfile_complaints, _("Macro in a type symtab"));
  if (have_line_numbers)
    complaint (&symfile_complaints,
	       _("Line numbers recorded in a type symtab"));

  if (file_symbols != NULL)
    {
      struct block *block = BLOCKVECTOR_BLOCK (blockvector, STATIC_BLOCK);

      /* First mark any symbols without a specified symtab as belonging
	 to the primary symtab.  */
      set_missing_symtab (file_symbols, primary_symtab);

      dict_add_pending (BLOCK_DICT (block), file_symbols);
    }

  if (global_symbols != NULL)
    {
      struct block *block = BLOCKVECTOR_BLOCK (blockvector, GLOBAL_BLOCK);

      /* First mark any symbols without a specified symtab as belonging
	 to the primary symtab.  */
      set_missing_symtab (global_symbols, primary_symtab);

      dict_add_pending (BLOCK_DICT (block), global_symbols);
    }

  reset_symtab_globals ();
}

/* Push a context block.  Args are an identifying nesting level
   (checkable when you pop it), and the starting PC address of this
   context.  */

struct context_stack *
push_context (int desc, CORE_ADDR valu)
{
  struct context_stack *new;

  if (context_stack_depth == context_stack_size)
    {
      context_stack_size *= 2;
      context_stack = (struct context_stack *)
	xrealloc ((char *) context_stack,
		  (context_stack_size * sizeof (struct context_stack)));
    }

  new = &context_stack[context_stack_depth++];
  new->depth = desc;
  new->locals = local_symbols;
  new->old_blocks = pending_blocks;
  new->start_addr = valu;
  new->using_directives = using_directives;
  new->name = NULL;

  local_symbols = NULL;
  using_directives = NULL;

  return new;
}

/* Pop a context block.  Returns the address of the context block just
   popped.  */

struct context_stack *
pop_context (void)
{
  gdb_assert (context_stack_depth > 0);
  return (&context_stack[--context_stack_depth]);
}



/* Compute a small integer hash code for the given name.  */

int
hashname (const char *name)
{
    return (hash(name,strlen(name)) % HASHSIZE);
}


void
record_debugformat (const char *format)
{
  current_subfile->debugformat = format;
}

void
record_producer (const char *producer)
{
  current_subfile->producer = producer;
}

/* Merge the first symbol list SRCLIST into the second symbol list
   TARGETLIST by repeated calls to add_symbol_to_list().  This
   procedure "frees" each link of SRCLIST by adding it to the
   free_pendings list.  Caller must set SRCLIST to a null list after
   calling this function.

   Void return.  */

void
merge_symbol_lists (struct pending **srclist, struct pending **targetlist)
{
  int i;

  if (!srclist || !*srclist)
    return;

  /* Merge in elements from current link.  */
  for (i = 0; i < (*srclist)->nsyms; i++)
    add_symbol_to_list ((*srclist)->symbol[i], targetlist);

  /* Recurse on next.  */
  merge_symbol_lists (&(*srclist)->next, targetlist);

  /* "Free" the current link.  */
  (*srclist)->next = free_pendings;
  free_pendings = (*srclist);
}


/* Name of source file whose symbol data we are now processing.  This
   comes from a symbol of type N_SO for stabs.  For Dwarf it comes
   from the DW_AT_name attribute of a DW_TAG_compile_unit DIE.  */

static char *last_source_file;

/* See buildsym.h.  */

void
set_last_source_file (const char *name)
{
  xfree (last_source_file);
  last_source_file = name == NULL ? NULL : xstrdup (name);
}

/* See buildsym.h.  */

const char *
get_last_source_file (void)
{
  return last_source_file;
}



/* Initialize anything that needs initializing when starting to read a
   fresh piece of a symbol file, e.g. reading in the stuff
   corresponding to a psymtab.  */

void
buildsym_init (void)
{
  free_pendings = NULL;
  file_symbols = NULL;
  global_symbols = NULL;
  pending_blocks = NULL;
  pending_macros = NULL;
  using_directives = NULL;
  subfile_stack = NULL;

  /* We shouldn't have any address map at this point.  */
  gdb_assert (! pending_addrmap);
  pending_addrmap_interesting = 0;
}

/* Initialize anything that needs initializing when a completely new
   symbol file is specified (not just adding some symbols from another
   file, e.g. a shared library).  */

void
buildsym_new_init (void)
{
  buildsym_init ();
}