aboutsummaryrefslogtreecommitdiff
path: root/gdb/dstread.c
blob: d23f9f6ed415d4c8ad81d39b7e9881b38b5b59d0 (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
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
/* Read apollo DST symbol tables and convert to internal format, for GDB.
   Contributed by Troy Rollo, University of NSW (troy@cbme.unsw.edu.au).
   Copyright 1993 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 2 of the License, or
(at your option) any later version.

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

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "breakpoint.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "buildsym.h"
#include "obstack.h"

#include "gdb_string.h"

#include "dst.h"

CORE_ADDR cur_src_start_addr, cur_src_end_addr;
dst_sec	blocks_info, lines_info, symbols_info;

/* Vector of line number information.  */

static struct linetable *line_vector;

/* Index of next entry to go in line_vector_index.  */

static int line_vector_index;

/* Last line number recorded in the line vector.  */

static int prev_line_number;

/* Number of elements allocated for line_vector currently.  */

static int line_vector_length;

static int
init_dst_sections PARAMS ((int));

static void
read_dst_symtab PARAMS ((struct objfile *));

static void
find_dst_sections PARAMS ((bfd *, sec_ptr, PTR));

static void
dst_symfile_init PARAMS ((struct objfile *));

static void
dst_new_init PARAMS ((struct objfile *));

static void
dst_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));

static void
dst_symfile_finish PARAMS ((struct objfile *));

static void
dst_end_symtab PARAMS ((struct objfile *));

static void
complete_symtab PARAMS ((char *, CORE_ADDR, unsigned int));

static void
dst_start_symtab PARAMS ((void));

static void
dst_record_line PARAMS ((int, CORE_ADDR));

/* Manage the vector of line numbers.  */
/* FIXME: Use record_line instead.  */

static void
dst_record_line (line, pc)
     int line;
     CORE_ADDR pc;
{
  struct linetable_entry *e;
  /* Make sure line vector is big enough.  */

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

  e = line_vector->item + line_vector_index++;
  e->line = line; e->pc = pc;
}

/* Start a new symtab for a new source file.
   It indicates the start of data for one original source file.  */
/* FIXME: use start_symtab, like coffread.c now does.  */

static void
dst_start_symtab ()
{
  /* Initialize the source file line number information for this file.  */

  if (line_vector)		/* Unlikely, but maybe possible? */
    free ((PTR)line_vector);
  line_vector_index = 0;
  line_vector_length = 1000;
  prev_line_number = -2;	/* Force first line number to be explicit */
  line_vector = (struct linetable *)
    xmalloc (sizeof (struct linetable)
	     + line_vector_length * sizeof (struct linetable_entry));
}

/* Save the vital information from when starting to read a file,
   for use when closing off the current file.
   NAME is the file name the symbols came from, START_ADDR is the first
   text address for the file, and SIZE is the number of bytes of text.  */

static void
complete_symtab (name, start_addr, size)
    char *name;
    CORE_ADDR start_addr;
    unsigned int size;
{
  last_source_file = savestring (name, strlen (name));
  cur_src_start_addr = start_addr;
  cur_src_end_addr = start_addr + size;

  if (current_objfile -> ei.entry_point >= cur_src_start_addr &&
      current_objfile -> ei.entry_point <  cur_src_end_addr)
    {
      current_objfile -> ei.entry_file_lowpc = cur_src_start_addr;
      current_objfile -> ei.entry_file_highpc = cur_src_end_addr;
    }
}

/* 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. */
/* FIXME: Use end_symtab, like coffread.c now does.  */

static void
dst_end_symtab (objfile)
     struct objfile *objfile;
{
  register struct symtab *symtab;
  register struct blockvector *blockvector;
  register struct linetable *lv;

  /* Create the blockvector that points to all the file's blocks.  */

  blockvector = make_blockvector (objfile);

  /* Now create the symtab object for this source file.  */
  symtab = allocate_symtab (last_source_file, objfile);

  /* Fill in its components.  */
  symtab->blockvector = blockvector;
  symtab->free_code = free_linetable;
  symtab->free_ptr = 0;
  symtab->filename = last_source_file;
  symtab->dirname = NULL;
  symtab->debugformat = obsavestring ("Apollo DST", 10,
				      &objfile -> symbol_obstack);
  lv = line_vector;
  lv->nitems = line_vector_index;
  symtab->linetable = (struct linetable *)
    xrealloc ((char *) lv, (sizeof (struct linetable)
		   + lv->nitems * sizeof (struct linetable_entry)));

  free_named_symtabs (symtab->filename);

  /* Reinitialize for beginning of new file. */
  line_vector = 0;
  line_vector_length = -1;
  last_source_file = NULL;
}

/* dst_symfile_init ()
   is the dst-specific initialization routine for reading symbols.

   We will only be called if this is a DST or DST-like file.
   BFD handles figuring out the format of the file, and code in symtab.c
   uses BFD's determination to vector to us.

   The ultimate result is a new symtab (or, FIXME, eventually a psymtab).  */

static void
dst_symfile_init (objfile)
     struct objfile *objfile;
{
  asection	*section;
  bfd *abfd = objfile->obfd;

  init_entry_point_info (objfile);

}

/* This function is called for every section; it finds the outer limits
   of the line table (minimum and maximum file offset) so that the
   mainline code can read the whole thing for efficiency.  */

/* ARGSUSED */
static void
find_dst_sections (abfd, asect, vpinfo)
     bfd *abfd;
     sec_ptr asect;
     PTR vpinfo;
{
  int size, count;
  long base;
  file_ptr offset, maxoff;
  dst_sec *section;

/* WARNING WILL ROBINSON!  ACCESSING BFD-PRIVATE DATA HERE!  FIXME!  */
  size = asect->_raw_size;
  offset = asect->filepos;
  base = asect->vma;
/* End of warning */

  section = NULL;
  if (!strcmp(asect->name, ".blocks"))
    section = &blocks_info;
  else if (!strcmp(asect->name, ".lines"))
    section = &lines_info;
  else if (!strcmp(asect->name, ".symbols"))
    section = &symbols_info;
  if (!section)
    return;
  section->size = size;
  section->position = offset;
  section->base = base;
}


/* The BFD for this file -- only good while we're actively reading
   symbols into a psymtab or a symtab.  */

static bfd *symfile_bfd;

/* Read a symbol file, after initialization by dst_symfile_init.  */
/* FIXME!  Addr and Mainline are not used yet -- this will not work for
   shared libraries or add_file!  */

/* ARGSUSED */
static void
dst_symfile_read (objfile, section_offsets, mainline)
     struct objfile *objfile;
     struct section_offsets *section_offsets;
     int mainline;
{
  bfd *abfd = objfile->obfd;
  char *name = bfd_get_filename (abfd);
  int desc;
  register int val;
  int num_symbols;
  int symtab_offset;
  int stringtab_offset;

  symfile_bfd = abfd;			/* Kludge for swap routines */

/* WARNING WILL ROBINSON!  ACCESSING BFD-PRIVATE DATA HERE!  FIXME!  */
   desc = fileno ((FILE *)(abfd->iostream));	/* File descriptor */

  /* Read the line number table, all at once.  */
  bfd_map_over_sections (abfd, find_dst_sections, (PTR)NULL);

  val = init_dst_sections (desc);
  if (val < 0)
    error ("\"%s\": error reading debugging symbol tables\n", name);

  init_minimal_symbol_collection ();
  make_cleanup (discard_minimal_symbols, 0);

  /* Now that the executable file is positioned at symbol table,
     process it and define symbols accordingly.  */

  read_dst_symtab (objfile);

  /* Sort symbols alphabetically within each block.  */

  {
    struct symtab *s;
    for (s = objfile -> symtabs; s != NULL; s = s -> next)
      {
	sort_symtab_syms (s);
      }
  }

  /* Install any minimal symbols that have been collected as the current
     minimal symbols for this objfile. */

  install_minimal_symbols (objfile);
}

static void
dst_new_init (ignore)
     struct objfile *ignore;
{
	/* Nothin' to do */
}

/* Perform any local cleanups required when we are done with a particular
   objfile.  I.E, we are in the process of discarding all symbol information
   for an objfile, freeing up all memory held for it, and unlinking the
   objfile struct from the global list of known objfiles. */

static void
dst_symfile_finish (objfile)
     struct objfile *objfile;
{
    /* Nothing to do */
}


/* Get the next line number from the DST. Returns 0 when we hit an
 * end directive or cannot continue for any other reason.
 *
 * Note that ordinary pc deltas are multiplied by two. Apparently
 * this is what was really intended.
 */
static int
get_dst_line(buffer, pc)
    signed char **buffer;
    long *pc;
{
	static last_pc = 0;
	static long last_line = 0;
	static int last_file = 0;
	dst_ln_entry_ptr_t entry;
	int size;
	dst_src_loc_t *src_loc;

	if (*pc != -1)
	{
		last_pc = *pc;
		*pc = -1;
	}
	entry = (dst_ln_entry_ptr_t) *buffer;

	while (dst_ln_ln_delta(*entry) == dst_ln_escape_flag)
	{
		switch(entry->esc.esc_code)
		{
		case dst_ln_pad:
			size = 1;         /* pad byte */
			break;
		case dst_ln_file:
		        /* file escape.  Next 4 bytes are a dst_src_loc_t */
			size = 5;
			src_loc = (dst_src_loc_t *) (*buffer + 1);
			last_line = src_loc->line_number;
			last_file = src_loc->file_index;
			break;
		case dst_ln_dln1_dpc1:
			/* 1 byte line delta, 1 byte pc delta */    
			last_line += (*buffer)[1];
			last_pc += 2 * (unsigned char) (*buffer)[2];
			dst_record_line(last_line, last_pc);
			size = 3;
			break;
		case dst_ln_dln2_dpc2:
			/* 2 bytes line delta, 2 bytes pc delta */
			last_line += *(short *) (*buffer + 1);
			last_pc += 2 * (*(short *) (*buffer + 3));
			size = 5;
			dst_record_line(last_line, last_pc);
			break;
		case dst_ln_ln4_pc4:
			/* 4 bytes ABSOLUTE line number, 4 bytes ABSOLUTE pc */
			last_line = *(unsigned long *) (*buffer + 1);
			last_pc = *(unsigned long *) (*buffer + 5);
			size = 9;
			dst_record_line(last_line, last_pc);
			break;
		case dst_ln_dln1_dpc0:
			/* 1 byte line delta, pc delta = 0 */
			size = 2;
			last_line+= (*buffer)[1];
			break;
		 case dst_ln_ln_off_1:
			/* statement escape, stmt # = 1 (2nd stmt on line) */
			size = 1;
			break;
		case dst_ln_ln_off:
			/* statement escape, stmt # = next byte */
			size = 2;
			break;
		case dst_ln_entry:
			/* entry escape, next byte is entry number */    
			size = 2;
			break;
		case dst_ln_exit:
			/* exit escape */
			size = 1;
			break;
		case dst_ln_stmt_end:
			/* gap escape, 4 bytes pc delta */
			size = 5;
			/* last_pc += 2 * (*(long *) (*buffer + 1)); */
			/* Apparently this isn't supposed to actually modify
			 * the pc value. Totally weird.
			 */
			break;
		 case dst_ln_escape_11:
		 case dst_ln_escape_12:
		 case dst_ln_escape_13:
			size = 1;
			break;
		 case dst_ln_nxt_byte:
			/* This shouldn't happen. If it does, we're SOL */
			return 0;
			break;
		 case dst_ln_end:
			/* end escape, final entry follows */
			return 0;
		}
		*buffer += (size < 0) ? -size : size;
		entry = (dst_ln_entry_ptr_t) *buffer;
	}
	last_line += dst_ln_ln_delta(*entry);
	last_pc += entry->delta.pc_delta * 2;
	(*buffer)++;
	dst_record_line(last_line, last_pc);
	return 1;
}

static	void
enter_all_lines(buffer, address)
    char *buffer;
    long address;
{
    if (buffer)
	while (get_dst_line(&buffer, &address));
}

static int
get_dst_entry(buffer, ret_entry)
    char *buffer;
    dst_rec_ptr_t *ret_entry;
{
    int size;
    dst_rec_ptr_t entry;
    static int last_type;
    int	ar_size;
    static unsigned lu3;

    entry = (dst_rec_ptr_t) buffer;
    switch(entry->rec_type)
    {
    case dst_typ_pad:
	size = 0;
	break;
    case dst_typ_comp_unit:
	size = sizeof(DST_comp_unit(entry));
	break;
    case dst_typ_section_tab:
	size = sizeof(DST_section_tab(entry))
		+ ((int) DST_section_tab(entry).number_of_sections
		   - dst_dummy_array_size) * sizeof(long);
	break;
    case dst_typ_file_tab:
	size = sizeof(DST_file_tab(entry))
		+ ((int) DST_file_tab(entry).number_of_files
		   - dst_dummy_array_size) * sizeof(dst_file_desc_t);
	break;
    case dst_typ_block:
	size = sizeof(DST_block(entry))
		+ ((int) DST_block(entry).n_of_code_ranges
		   - dst_dummy_array_size) * sizeof(dst_code_range_t);
	break;
    case dst_typ_5:
	size = -1;
	break;
    case dst_typ_var:
	size = sizeof(DST_var(entry)) -
		sizeof(dst_var_loc_long_t) * dst_dummy_array_size +
		DST_var(entry).no_of_locs *
		( DST_var(entry).short_locs ?
		  sizeof(dst_var_loc_short_t):
		  sizeof(dst_var_loc_long_t));
	break;
    case dst_typ_pointer:
	size = sizeof(DST_pointer(entry));
	break;
    case dst_typ_array:
	size = sizeof(DST_array(entry));
	break;
    case dst_typ_subrange:
	size = sizeof(DST_subrange(entry));
	break;
    case dst_typ_set:
	size = sizeof(DST_set(entry));
	break;
    case dst_typ_implicit_enum:
	size = sizeof(DST_implicit_enum(entry))
		+ ((int) DST_implicit_enum(entry).nelems
		   - dst_dummy_array_size) * sizeof(dst_rel_offset_t);
	break;
    case dst_typ_explicit_enum:
	size = sizeof(DST_explicit_enum(entry))
		+ ((int) DST_explicit_enum(entry).nelems
		   - dst_dummy_array_size) * sizeof(dst_enum_elem_t);
	break;
    case dst_typ_short_rec:
	size = sizeof(DST_short_rec(entry))
		+ DST_short_rec(entry).nfields * sizeof(dst_short_field_t)
		- dst_dummy_array_size * sizeof(dst_field_t);
	break;
    case dst_typ_short_union:
	size = sizeof(DST_short_union(entry))
		+ DST_short_union(entry).nfields * sizeof(dst_short_field_t)
		- dst_dummy_array_size * sizeof(dst_field_t);
	break;
    case dst_typ_file:
	size = sizeof(DST_file(entry));
	break;
    case dst_typ_offset:
	size = sizeof(DST_offset(entry));
	break;
    case dst_typ_alias:
	size = sizeof(DST_alias(entry));
	break;
    case dst_typ_signature:
	size = sizeof(DST_signature(entry)) +
		((int) DST_signature(entry).nargs -
		 dst_dummy_array_size) * sizeof(dst_arg_t);
	break;
    case dst_typ_21:
	size = -1;
	break;
    case dst_typ_old_label:
	size = sizeof(DST_old_label(entry));
	break;
    case dst_typ_scope:
	size = sizeof(DST_scope(entry));
	break;
    case dst_typ_end_scope:
	size = 0;
	break;
    case dst_typ_25:
    case dst_typ_26:
	size = -1;
	break;
    case dst_typ_string_tab:
    case dst_typ_global_name_tab:
	size = sizeof(DST_string_tab(entry))
		+ DST_string_tab(entry).length
		- dst_dummy_array_size;
	break;
    case dst_typ_forward:
	size = sizeof(DST_forward(entry));
	get_dst_entry((char *) entry + DST_forward(entry).rec_off, &entry);
	break;
    case dst_typ_aux_size:
	size = sizeof(DST_aux_size(entry));
	break;
    case dst_typ_aux_align:
	size = sizeof(DST_aux_align(entry));
	break;
    case dst_typ_aux_field_size:
	size = sizeof(DST_aux_field_size(entry));
	break;
    case dst_typ_aux_field_off:
	size = sizeof(DST_aux_field_off(entry));
	break;
    case dst_typ_aux_field_align:
	size = sizeof(DST_aux_field_align(entry));
	break;
    case dst_typ_aux_qual:
	size = sizeof(DST_aux_qual(entry));
	break;
    case dst_typ_aux_var_bound:
	size = sizeof(DST_aux_var_bound(entry));
	break;
    case dst_typ_extension:
	size = DST_extension(entry).rec_size;
	break;
    case dst_typ_string:
	size = sizeof(DST_string(entry));
	break;
    case dst_typ_old_entry:
	size = 48; /* Obsolete entry type */
	break;
    case dst_typ_const:
	size = sizeof(DST_const(entry))
		+ DST_const(entry).value.length
		- sizeof(DST_const(entry).value.val);
	break;
    case dst_typ_reference:
	size = sizeof(DST_reference(entry));
	break;
    case dst_typ_old_record:
    case dst_typ_old_union:
    case dst_typ_record:
    case dst_typ_union:
	size = sizeof(DST_record(entry))
		+ ((int) DST_record(entry).nfields
		   - dst_dummy_array_size) * sizeof(dst_field_t);
	break;
    case dst_typ_aux_type_deriv:
	size = sizeof(DST_aux_type_deriv(entry));
	break;
    case dst_typ_locpool:
	size = sizeof(DST_locpool(entry))
		+ ((int) DST_locpool(entry).length -
		   dst_dummy_array_size);
	break;
    case dst_typ_variable:
	size = sizeof(DST_variable(entry));
	break;
    case dst_typ_label:
	size = sizeof(DST_label(entry));
	break;
    case dst_typ_entry:
	size = sizeof(DST_entry(entry));
	break;
    case dst_typ_aux_lifetime:
	size = sizeof(DST_aux_lifetime(entry));
	break;
    case dst_typ_aux_ptr_base:
	size = sizeof(DST_aux_ptr_base(entry));
	break;
    case dst_typ_aux_src_range:
	size = sizeof(DST_aux_src_range(entry));
	break;
    case dst_typ_aux_reg_val:
	size = sizeof(DST_aux_reg_val(entry));
	break;
    case dst_typ_aux_unit_names:
	size = sizeof(DST_aux_unit_names(entry))
		+ ((int) DST_aux_unit_names(entry).number_of_names
		   - dst_dummy_array_size) * sizeof(dst_rel_offset_t);
	break;
    case dst_typ_aux_sect_info:
	size = sizeof(DST_aux_sect_info(entry))
		+ ((int) DST_aux_sect_info(entry).number_of_refs
		   - dst_dummy_array_size) * sizeof(dst_sect_ref_t);
	break;
    default:
	size = -1;
	break;
    }
    if (size == -1)
    {
	fprintf_unfiltered(gdb_stderr, "Warning: unexpected DST entry type (%d) found\nLast valid entry was of type: %d\n",
		(int) entry->rec_type,
		last_type);
	fprintf_unfiltered(gdb_stderr, "Last unknown_3 value: %d\n", lu3);
	size = 0;
    }
    else
	last_type = entry->rec_type;
    if (size & 1) /* Align on a word boundary */
	size++;
   size += 2;
   *ret_entry = entry;
   return size;
}

static	int next_dst_entry(buffer, entry, table)
    char **buffer;
    dst_rec_ptr_t *entry;
    dst_sec *table;
{
    if (*buffer - table->buffer >= table->size)
    {
	*entry = NULL;
	return 0;
    }
    *buffer += get_dst_entry(*buffer, entry);
    return 1;
}

#define NEXT_BLK(a, b) next_dst_entry(a, b, &blocks_info)
#define NEXT_SYM(a, b) next_dst_entry(a, b, &symbols_info)
#define	DST_OFFSET(a, b) ((char *) (a) + (b))

static	dst_rec_ptr_t	section_table = NULL;

char *
get_sec_ref(ref)
    dst_sect_ref_t *ref;
{
	dst_sec *section = NULL;
	long offset;

	if (!section_table || !ref->sect_index)
		return NULL;
	offset = DST_section_tab(section_table).section_base[ref->sect_index-1]
		+ ref->sect_offset;
	if (offset >= blocks_info.base &&
	    offset < blocks_info.base + blocks_info.size)
		section = &blocks_info;
	else if (offset >= symbols_info.base &&
		 offset < symbols_info.base + symbols_info.size)
		section = &symbols_info;
	else if (offset >= lines_info.base &&
		 offset < lines_info.base + lines_info.size)
		section = &lines_info;
	if (!section)
		return NULL;
	return section->buffer + (offset - section->base);
}

CORE_ADDR
dst_get_addr(int section, long offset)
{
	if (!section_table || !section)
		return 0;
	return DST_section_tab(section_table).section_base[section-1] + offset;
}

CORE_ADDR
dst_sym_addr(ref)
    dst_sect_ref_t *ref;
{
	if (!section_table || !ref->sect_index)
		return 0;
	return DST_section_tab(section_table).section_base[ref->sect_index-1]
		+ ref->sect_offset;
}

static struct type *
create_new_type(objfile)
    struct objfile *objfile;
{
	struct type *type;

	type = (struct type *)
		obstack_alloc (&objfile->symbol_obstack, sizeof (struct type));
	memset(type, 0, sizeof(struct type));
	return type;
}

static struct symbol *
create_new_symbol(objfile, name)
    struct objfile *objfile;
    char *name;
{
	struct symbol *sym = (struct symbol *)
	       obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol));
	memset (sym, 0, sizeof (struct symbol));
	SYMBOL_NAME (sym) = obsavestring (name, strlen (name),
					  &objfile->symbol_obstack);
	SYMBOL_VALUE (sym) = 0;
	SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;

	SYMBOL_CLASS (sym) = LOC_BLOCK;
	return sym;
};

static struct type *
decode_dst_type PARAMS ((struct objfile *, dst_rec_ptr_t));

static struct type *
decode_type_desc(objfile, type_desc, base)
	struct objfile *objfile;
	dst_type_t *type_desc;
	dst_rec_ptr_t base;
{
	struct type *type;
	dst_rec_ptr_t entry;
	if (type_desc->std_type.user_defined_type)
	{
		entry = (dst_rec_ptr_t) DST_OFFSET(base,
					dst_user_type_offset(*type_desc));
		type = decode_dst_type(objfile, entry);
	}
	else
	{
		switch(type_desc->std_type.dtc)
		{
		case dst_int8_type:
			type = builtin_type_signed_char;
			break;
		case dst_int16_type:
			type = builtin_type_short;
			break;
		case dst_int32_type:
			type = builtin_type_long;
			break;
		case dst_uint8_type:
			type = builtin_type_unsigned_char;
			break;
		case dst_uint16_type:
			type = builtin_type_unsigned_short;
			break;
		case dst_uint32_type:
			type = builtin_type_unsigned_long;
			break;
		case dst_real32_type:
			type = builtin_type_float;
			break;
		case dst_real64_type:
			type = builtin_type_double;
			break;
		case dst_complex_type:
			type = builtin_type_complex;
			break;
		case dst_dcomplex_type:
			type = builtin_type_double_complex;
			break;
		case dst_bool8_type:
			type = builtin_type_char;
			break;
		case dst_bool16_type:
			type = builtin_type_short;
			break;
		case dst_bool32_type:
			type = builtin_type_long;
			break;
		case dst_char_type:
			type = builtin_type_char;
			break;
		/* The next few are more complex. I will take care
		 * of them properly at a later point.
		 */
		case dst_string_type:
			type = builtin_type_void;
			break;
		case dst_ptr_type:
			type = builtin_type_void;
			break;
		case dst_set_type:
			type = builtin_type_void;
			break;
		case dst_proc_type:
			type = builtin_type_void;
			break;
		case dst_func_type:
			type = builtin_type_void;
			break;
		/* Back tto some ordinary ones */
		case dst_void_type:
			type = builtin_type_void;
			break;
		case dst_uchar_type:
			type = builtin_type_unsigned_char;
			break;
		default:
			type = builtin_type_void;
			break;
		}
	} 
	return type;
}

struct	structure_list
    {
    struct structure_list *next;
    struct type *type;
    };

static struct structure_list *struct_list = NULL;

static struct type *
find_dst_structure(name)
    char *name;
{
	struct structure_list *element;

	for (element = struct_list; element; element = element->next)
		if (!strcmp(name, TYPE_NAME(element->type)))
			return element->type;
	return NULL;
}


static struct type *
decode_dst_structure(objfile, entry, code, version)
    struct objfile *objfile;
    dst_rec_ptr_t entry;
    int code;
    int version;
{
	struct	type *type, *child_type;
	char	*struct_name;
	char	*name, *field_name;
	int	i;
	int	fieldoffset, fieldsize;
	dst_type_t type_desc;
	struct structure_list *element;

	struct_name = DST_OFFSET(entry, DST_record(entry).noffset);
	name = concat( (code == TYPE_CODE_UNION)?"union ":"struct ",
			struct_name, NULL);
	type = find_dst_structure(name);
	if (type)
	{
		free((PTR) name);
		return type;
	}
	type = create_new_type(objfile);
	TYPE_NAME(type) = obstack_copy0 (&objfile->symbol_obstack,
						name, strlen(name));
	free((PTR) name);
	TYPE_CODE(type) = code;
	TYPE_LENGTH(type) = DST_record(entry).size;
	TYPE_NFIELDS(type) = DST_record(entry).nfields;
	TYPE_FIELDS(type) = (struct field *)
	       obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) *
					DST_record(entry).nfields);
	fieldoffset = fieldsize = 0;
	INIT_CPLUS_SPECIFIC(type);
	element = (struct structure_list *)
				xmalloc(sizeof(struct structure_list));
	element->type = type;
	element->next = struct_list;
	struct_list = element;
	for (i = 0; i < DST_record(entry).nfields; i++)
	{
		switch (version)
		{
		case 2:
			field_name = DST_OFFSET(entry,
					DST_record(entry).f.ofields[i].noffset);
			fieldoffset = DST_record(entry).f.ofields[i].foffset*8 +
				      DST_record(entry).f.ofields[i].bit_offset;
			fieldsize = DST_record(entry).f.ofields[i].size;
			type_desc = DST_record(entry).f.ofields[i].type_desc;
			break;
		case 1:
			field_name = DST_OFFSET(entry,
					DST_record(entry).f.fields[i].noffset);
			type_desc = DST_record(entry).f.fields[i].type_desc;
			switch(DST_record(entry).f.fields[i].f.field_loc.format_tag)
			{
			case dst_field_byte:
				fieldoffset = DST_record(entry).f.
					fields[i].f.field_byte.offset * 8;
				fieldsize = -1;
				break;
			case dst_field_bit:
				fieldoffset = DST_record(entry).f.
					fields[i].f.field_bit.byte_offset * 8 +
					      DST_record(entry).f.
					fields[i].f.field_bit.bit_offset;
				fieldsize = DST_record(entry).f.
					fields[i].f.field_bit.nbits;
				break;
			case dst_field_loc:
				fieldoffset += fieldsize;
				fieldsize = -1;
				break;
			}
			break;
		case 0:
			field_name = DST_OFFSET(entry,
					DST_record(entry).f.sfields[i].noffset);
			fieldoffset = DST_record(entry).f.sfields[i].foffset;
			type_desc = DST_record(entry).f.sfields[i].type_desc;
			if (i < DST_record(entry).nfields - 1)
				fieldsize = DST_record(entry).f.sfields[i+1].foffset;
			else
				fieldsize = DST_record(entry).size;
			fieldsize -= fieldoffset;
			fieldoffset *= 8;
			fieldsize *= 8;
		}
		TYPE_FIELDS(type)[i].name = 
			obstack_copy0 (&objfile->symbol_obstack,
						field_name, strlen(field_name));
		TYPE_FIELDS(type)[i].type = decode_type_desc(objfile,
						&type_desc,
						entry);
		if (fieldsize == -1)
			fieldsize = TYPE_LENGTH(TYPE_FIELDS(type)[i].type) *
					8;
		TYPE_FIELDS(type)[i].bitsize = fieldsize;
		TYPE_FIELDS(type)[i].bitpos = fieldoffset;
	}
	return type;
}

static struct type *
decode_dst_type(objfile, entry)
    struct objfile *objfile;
    dst_rec_ptr_t entry;
{
	struct type *child_type, *type, *range_type, *index_type;

	switch(entry->rec_type)
	{
	case dst_typ_var:
		return decode_type_desc(objfile,
				 	&DST_var(entry).type_desc,
					entry);
		break;
	case dst_typ_variable:
		return decode_type_desc(objfile,
				 	&DST_variable(entry).type_desc,
					entry);
		break;
	case dst_typ_short_rec:
		return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,0);
	case dst_typ_short_union:
		return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 0);
	case dst_typ_union:
		return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 1);
	case dst_typ_record:
		return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,1);
	case dst_typ_old_union:
		return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 2);
	case dst_typ_old_record:
		return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,2);
	case dst_typ_pointer:
		return make_pointer_type(
				decode_type_desc(objfile,
					&DST_pointer(entry).type_desc,
					entry),
				NULL);
	case dst_typ_array:
		child_type = decode_type_desc(objfile,
					     &DST_pointer(entry).type_desc,
					     entry);
		index_type = lookup_fundamental_type(objfile,
							FT_INTEGER);
		range_type = create_range_type ((struct type *) NULL,
				index_type, DST_array(entry).lo_bound,
					DST_array(entry).hi_bound);
		return create_array_type ((struct type *) NULL, child_type,
					range_type);
	case dst_typ_alias:
		return decode_type_desc(objfile,
					&DST_alias(entry).type_desc,
					entry);
	default:
		return builtin_type_int;
	}
}

struct	symbol_list {
	struct symbol_list *next;
	struct symbol *symbol;
};

static	struct	symbol_list *dst_global_symbols = NULL;
static	int	total_globals = 0;

static void
decode_dst_locstring(locstr, sym)
    char *locstr;
    struct symbol *sym;
{
	dst_loc_entry_t *entry, *next_entry;
	CORE_ADDR	temp;
	int count = 0;

	while(1)
	{
		if (count++ == 100)
		{
			fprintf_unfiltered(gdb_stderr, "Error reading locstring\n");
			break;
		}
		entry = (dst_loc_entry_t *) locstr;
		next_entry = (dst_loc_entry_t *) (locstr + 1);
		switch (entry->header.code)
		{
		case dst_lsc_end:	/* End of string */
			return;
		case dst_lsc_indirect:/* Indirect through previous. Arg == 6 */
					/* Or register ax x == arg */
			if (entry->header.arg < 6)
			{
				SYMBOL_CLASS(sym) = LOC_REGISTER;
				SYMBOL_VALUE(sym) = entry->header.arg + 8;
			}
			/* We predict indirects */
			locstr++;
			break;
		case dst_lsc_dreg:
			SYMBOL_CLASS(sym) = LOC_REGISTER;
			SYMBOL_VALUE(sym) = entry->header.arg;
			locstr++;
			break;
		case dst_lsc_section:/* Section (arg+1) */
			SYMBOL_VALUE(sym) = dst_get_addr(entry->header.arg+1, 0);
			locstr++;
			break;
		case dst_lsc_sec_byte: /* Section (next_byte+1) */
			SYMBOL_VALUE(sym) = dst_get_addr(locstr[1]+1, 0);
			locstr+=2;
			break;
		case dst_lsc_add:	/* Add (arg+1)*2 */
		case dst_lsc_sub:	/* Subtract (arg+1)*2 */
			temp = (entry->header.arg + 1) * 2;
			locstr++;
			if (*locstr == dst_multiply_256)
			{
				temp <<= 8;
				locstr++;
			}
			switch(entry->header.code)
			{
			case dst_lsc_add:
				if (SYMBOL_CLASS(sym) == LOC_LOCAL)
					SYMBOL_CLASS(sym) = LOC_ARG;
				SYMBOL_VALUE(sym) += temp;
				break;
			case dst_lsc_sub:
				SYMBOL_VALUE(sym) -= temp;
				break;
			}
			break;
		case dst_lsc_add_byte:
		case dst_lsc_sub_byte:
			switch (entry->header.arg & 0x03)
			{
			case 1:
				temp = (unsigned char) locstr[1];
				locstr += 2;
				break;
			case 2:
				temp = * (unsigned short *) (locstr + 1);
				locstr += 3;
				break;
			case 3:
				temp = * (unsigned long *) (locstr + 1);
				locstr += 5;
				break;
			}
			if (*locstr == dst_multiply_256)
			{
				temp <<= 8;
				locstr++;
			}
			switch(entry->header.code)
			{
			case dst_lsc_add_byte:
				if (SYMBOL_CLASS(sym) == LOC_LOCAL)
					SYMBOL_CLASS(sym) = LOC_ARG;
				SYMBOL_VALUE(sym) += temp;
				break;
			case dst_lsc_sub_byte:
				SYMBOL_VALUE(sym) -= temp;
				break;
			}
			break;
		case dst_lsc_sbreg:	/* Stack base register (frame pointer). Arg==0*/
			if (next_entry->header.code != dst_lsc_indirect)
			{
				SYMBOL_VALUE(sym) = 0;
				SYMBOL_CLASS(sym) = LOC_STATIC;
				return;
			}
			SYMBOL_VALUE(sym) = 0;
			SYMBOL_CLASS(sym) = LOC_LOCAL;
			locstr++;
			break;
		default:
			SYMBOL_VALUE(sym) = 0;
			SYMBOL_CLASS(sym) = LOC_STATIC;
			return;
		}
	}
}

static struct symbol_list *
process_dst_symbols(objfile, entry, name, nsyms_ret)
    struct objfile *objfile;
    dst_rec_ptr_t entry;
    char *name;
    int *nsyms_ret;
{
	struct symbol_list *list = NULL, *element;
	struct symbol *sym;
	char *symname;
	int nsyms = 0;
	char *location;
	long line;
	dst_type_t symtype;
	struct type *type;
	dst_var_attr_t attr;
	dst_var_loc_t loc_type;
	unsigned loc_index;
	long	loc_value;

	if (!entry)
	{
		*nsyms_ret = 0;
		return NULL;
	}
	location = (char *) entry;
	while (NEXT_SYM(&location, &entry) &&
	       entry->rec_type != dst_typ_end_scope)
	{
		if (entry->rec_type == dst_typ_var)
		{
			if (DST_var(entry).short_locs)
			{
				loc_type = DST_var(entry).locs.shorts[0].loc_type;
				loc_index = DST_var(entry).locs.shorts[0].loc_index;
				loc_value = DST_var(entry).locs.shorts[0].location;
			}
			else
			{
				loc_type = DST_var(entry).locs.longs[0].loc_type;
				loc_index = DST_var(entry).locs.longs[0].loc_index;
				loc_value = DST_var(entry).locs.longs[0].location;
			}
			if (loc_type == dst_var_loc_external)
				continue;
			symname = DST_OFFSET(entry, DST_var(entry).noffset);
			line = DST_var(entry).src_loc.line_number;
			symtype = DST_var(entry).type_desc;
			attr = DST_var(entry).attributes;
		}
		else if (entry->rec_type == dst_typ_variable)
		{
			symname = DST_OFFSET(entry,
						DST_variable(entry).noffset);
			line = DST_variable(entry).src_loc.line_number;
			symtype = DST_variable(entry).type_desc;
			attr = DST_variable(entry).attributes;
		}
		else
		{
			continue;
		}
		if (symname && name && !strcmp(symname, name))
			/* It's the function return value */
			continue;
		sym = create_new_symbol(objfile, symname);

		if ((attr & (1<<dst_var_attr_global)) ||
		    (attr & (1<<dst_var_attr_static)))
			SYMBOL_CLASS(sym) = LOC_STATIC;
		else
			SYMBOL_CLASS(sym) = LOC_LOCAL;
		SYMBOL_LINE(sym) = line;
		SYMBOL_TYPE(sym) = decode_type_desc(objfile, &symtype,
						entry);
		SYMBOL_VALUE(sym) = 0;
		switch (entry->rec_type)
		{
		case dst_typ_var:
			switch(loc_type)
			{
			case dst_var_loc_abs:
				SYMBOL_VALUE_ADDRESS(sym) = loc_value;
				break;
			case dst_var_loc_sect_off:
			case dst_var_loc_ind_sect_off: /* What is this? */
				SYMBOL_VALUE_ADDRESS(sym) = dst_get_addr(
						loc_index,
						loc_value);
				break;
			case dst_var_loc_ind_reg_rel: /* What is this? */
			case dst_var_loc_reg_rel:
				/* If it isn't fp relative, specify the
				 * register it's relative to.
				 */
				if (loc_index)
				{
					sym->aux_value.basereg = loc_index;
				}
				SYMBOL_VALUE(sym) = loc_value;
				if (loc_value > 0 &&
				    SYMBOL_CLASS(sym) == LOC_BASEREG)
					SYMBOL_CLASS(sym) = LOC_BASEREG_ARG;
				break;
			case dst_var_loc_reg:
				SYMBOL_VALUE(sym) = loc_index;
				SYMBOL_CLASS(sym) = LOC_REGISTER;
				break;
			}
			break;
		case dst_typ_variable:
			/* External variable..... don't try to interpret
			 * its nonexistant locstring.
			 */
			if (DST_variable(entry).loffset == -1)
				continue;
			decode_dst_locstring(DST_OFFSET(entry,
						DST_variable(entry).loffset),
					     sym);
		}
		element = (struct symbol_list *)
				xmalloc(sizeof(struct symbol_list));
		
		if (attr & (1<<dst_var_attr_global))
		{
			element->next = dst_global_symbols;
			dst_global_symbols = element;
			total_globals++;
		}
		else
		{
			element->next = list;
			list = element;
			nsyms++;
		}
		element->symbol = sym;
	}
	*nsyms_ret = nsyms;
	return list;
}


static struct symbol *
process_dst_function(objfile, entry, name, address)
    struct objfile *objfile;
    dst_rec_ptr_t entry;
    char *name;
    CORE_ADDR address;
{
	struct	symbol *sym;
	struct	type *type, *ftype;
	dst_rec_ptr_t sym_entry, typ_entry;
	char *location;
	struct symbol_list *element;

	type = builtin_type_int;
	sym = create_new_symbol(objfile, name);
	SYMBOL_CLASS(sym) = LOC_BLOCK;

	if (entry)
	{
		location = (char *) entry;
		do
		{
			NEXT_SYM(&location, &sym_entry);
		} while (sym_entry && sym_entry->rec_type != dst_typ_signature);

		if (sym_entry)
		{
			SYMBOL_LINE(sym) =
				DST_signature(sym_entry).src_loc.line_number;
			if (DST_signature(sym_entry).result)
			{
				typ_entry = (dst_rec_ptr_t)
					    DST_OFFSET(sym_entry,
					    DST_signature(sym_entry).result);
				type = decode_dst_type(objfile, typ_entry);
			}
		}
	}

	if (!type->function_type)
	{
		ftype = create_new_type(objfile);
		type->function_type = ftype;
		ftype->target_type = type;
		ftype->code = TYPE_CODE_FUNC;
	}
	SYMBOL_TYPE(sym) = type->function_type;

	/* Now add ourselves to the global symbols list */
	element = (struct symbol_list *)
			xmalloc(sizeof(struct symbol_list));

	element->next = dst_global_symbols;
	dst_global_symbols = element;
	total_globals++;
	element->symbol = sym;

	return sym;
}

static struct block *
process_dst_block(objfile, entry)
    struct objfile *objfile;
    dst_rec_ptr_t entry;
{
	struct	block	*block;
	struct	symbol	*function = NULL;
	CORE_ADDR address;
	long	size;
	char	*name;
	dst_rec_ptr_t child_entry, symbol_entry;
	struct block *child_block;
	int	total_symbols = 0;
	char	fake_name[20];
	static	long	fake_seq = 0;
	struct symbol_list *symlist, *nextsym;
	int	symnum;

	if (DST_block(entry).noffset)
		name = DST_OFFSET(entry, DST_block(entry).noffset);
	else
		name = NULL;
	if (DST_block(entry).n_of_code_ranges)
	{
		address = dst_sym_addr(
				&DST_block(entry).code_ranges[0].code_start);
		size = DST_block(entry).code_ranges[0].code_size;
	}
	else
	{
		address = -1;
		size = 0;
	}
	symbol_entry = (dst_rec_ptr_t) get_sec_ref(&DST_block(entry).symbols_start);
	switch(DST_block(entry).block_type)
	{
	/* These are all really functions. Even the "program" type.
	 * This is because the Apollo OS was written in Pascal, and
	 * in Pascal, the main procedure is described as the Program.
	 * Cute, huh?
	 */
	case dst_block_procedure:
	case dst_block_function:
	case dst_block_subroutine:
	case dst_block_program:
		prim_record_minimal_symbol(name, address, mst_text, objfile);
		function = process_dst_function(
			objfile,
			symbol_entry,
			name,
			address);
		enter_all_lines(get_sec_ref(&DST_block(entry).code_ranges[0].lines_start), address);
		break;
	case dst_block_block_data:
		break;

	default:
		/* GDB has to call it something, and the module name
		 * won't cut it
		 */
		sprintf(fake_name, "block_%08lx", fake_seq++);
		function = process_dst_function(
			objfile, NULL, fake_name, address);
		break;
	}
	symlist = process_dst_symbols(objfile, symbol_entry,
					name, &total_symbols);
	block = (struct block *)
	    obstack_alloc (&objfile->symbol_obstack,
				sizeof (struct block) +
				(total_symbols - 1) * sizeof (struct symbol *));

	symnum = 0;
	while (symlist)
	{
		nextsym = symlist->next;

		block->sym[symnum] = symlist->symbol;

		free((PTR) symlist);
		symlist = nextsym;
		symnum++;
	}
	BLOCK_NSYMS (block) = total_symbols;
	BLOCK_START (block) = address;
	BLOCK_END (block) = address + size;
	BLOCK_SUPERBLOCK (block) = 0;
	if (function)
	{
		SYMBOL_BLOCK_VALUE (function) = block;
		BLOCK_FUNCTION (block) = function;
	}
	else
		BLOCK_FUNCTION (block) = 0;

	if (DST_block(entry).child_block_off)
	{
		child_entry = (dst_rec_ptr_t) DST_OFFSET(entry,
					DST_block(entry).child_block_off);
		while (child_entry)
		{
			child_block = process_dst_block(objfile, child_entry);
			if (child_block)
			{
				if (BLOCK_START(child_block) <
				     BLOCK_START(block) ||
				    BLOCK_START(block) == -1)
					BLOCK_START(block) =
					     BLOCK_START(child_block);
				if (BLOCK_END(child_block) >
				     BLOCK_END(block) ||
				    BLOCK_END(block) == -1)
					BLOCK_END(block) =
					     BLOCK_END(child_block);
				BLOCK_SUPERBLOCK (child_block) = block;
			}
			if (DST_block(child_entry).sibling_block_off)
				child_entry = (dst_rec_ptr_t) DST_OFFSET(
					child_entry,
					DST_block(child_entry).sibling_block_off);
			else
				child_entry = NULL;
		}
	}
	record_pending_block (objfile, block, NULL);
	return block;
}


static void
read_dst_symtab (objfile)
     struct objfile *objfile;
{
	char	*buffer;
	dst_rec_ptr_t entry, file_table, root_block;
	char	*source_file;
	struct	block *block, *global_block;
	int	symnum;
	struct symbol_list *nextsym;
	int	module_num = 0;
	struct	structure_list *element;

	current_objfile = objfile;
	buffer = blocks_info.buffer;
	while (NEXT_BLK(&buffer, &entry))
	{
		if (entry->rec_type == dst_typ_comp_unit)
		{
			file_table = (dst_rec_ptr_t) DST_OFFSET(entry,
					DST_comp_unit(entry).file_table);
			section_table = (dst_rec_ptr_t) DST_OFFSET(entry,
					DST_comp_unit(entry).section_table);
			root_block = (dst_rec_ptr_t) DST_OFFSET(entry,
					DST_comp_unit(entry).root_block_offset);
			source_file = DST_OFFSET(file_table,
					DST_file_tab(file_table).files[0].noffset);
			/* Point buffer to the start of the next comp_unit */
			buffer = DST_OFFSET(entry,
					DST_comp_unit(entry).data_size);
			dst_start_symtab();

			block = process_dst_block(objfile, root_block);

			global_block = (struct block *)
				    obstack_alloc (&objfile->symbol_obstack,
					sizeof (struct block) +
					(total_globals - 1) *
					sizeof (struct symbol *));
			BLOCK_NSYMS(global_block) = total_globals;
			for (symnum = 0; symnum < total_globals; symnum++)
			{
				nextsym = dst_global_symbols->next;

				global_block->sym[symnum] =
						dst_global_symbols->symbol;

				free((PTR) dst_global_symbols);
				dst_global_symbols = nextsym;
			}
			dst_global_symbols = NULL;
			total_globals = 0;
			BLOCK_FUNCTION(global_block) = 0;
			BLOCK_START(global_block) = BLOCK_START(block);
			BLOCK_END(global_block) = BLOCK_END(block);
			BLOCK_SUPERBLOCK(global_block) = 0;
			BLOCK_SUPERBLOCK(block) = global_block;
			record_pending_block (objfile, global_block, NULL);

			complete_symtab(source_file,
					BLOCK_START(block), 
					BLOCK_END(block) - BLOCK_START(block));
			module_num++;
			dst_end_symtab(objfile);
		}
	}
	if (module_num)
		prim_record_minimal_symbol("<end_of_program>",
				BLOCK_END(block), mst_text, objfile);
	/* One more faked symbol to make sure nothing can ever run off the
	 * end of the symbol table. This one represents the end of the
	 * text space. It used to be (CORE_ADDR) -1 (effectively the highest
	 * int possible), but some parts of gdb treated it as a signed
	 * number and failed comparisons. We could equally use 7fffffff,
	 * but no functions are ever mapped to an address higher than
	 * 40000000
	 */
	prim_record_minimal_symbol("<end_of_text>",
				(CORE_ADDR) 0x40000000,
				mst_text, objfile);
	while (struct_list)
	{
		element = struct_list;
		struct_list = element->next;
		free((PTR) element);
	}
}


/* Support for line number handling */
static char *linetab = NULL;
static long linetab_offset;
static unsigned long linetab_size;

/* Read in all the line numbers for fast lookups later.  Leave them in
   external (unswapped) format in memory; we'll swap them as we enter
   them into GDB's data structures.  */
static int
init_one_section(chan, secinfo)
    int chan;
    dst_sec *secinfo;
{
  if (secinfo->size == 0
      || lseek(chan, secinfo->position, 0) == -1
      || (secinfo->buffer = xmalloc(secinfo->size)) == NULL
      || myread(chan, secinfo->buffer, secinfo->size) == -1)
	return 0;
  else
	return 1;
}
 
static int
init_dst_sections (chan)
    int chan;
{

  if (!init_one_section(chan, &blocks_info) ||
      !init_one_section(chan, &lines_info) ||
      !init_one_section(chan, &symbols_info))
    return -1;
  else
    return 0;
}

/* Fake up support for relocating symbol addresses.  FIXME.  */

struct section_offsets dst_symfile_faker = {0};

struct section_offsets *
dst_symfile_offsets (objfile, addr)
     struct objfile *objfile;
     CORE_ADDR addr;
{
  objfile->num_sections = 1;
  return &dst_symfile_faker;
}

/* Register our ability to parse symbols for DST BFD files */

static struct sym_fns dst_sym_fns =
{
  /* FIXME: Can this be integrated with coffread.c?  If not, should it be
     a separate flavour like ecoff?  */
  (enum bfd_flavour)-2,

  dst_new_init,		/* sym_new_init: init anything gbl to entire symtab */
  dst_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
  dst_symfile_read,	/* sym_read: read a symbol file into symtab */
  dst_symfile_finish,	/* sym_finish: finished with file, cleanup */
  dst_symfile_offsets, /* sym_offsets:  xlate external to internal form */
  NULL			/* next: pointer to next struct sym_fns */
};

void
_initialize_dstread ()
{
  add_symtab_fns(&dst_sym_fns);
}