aboutsummaryrefslogtreecommitdiff
path: root/gdb/dbxread.c
blob: 012fac20119951405e4b30ebd6a5ab11c2fc7214 (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
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
/* Read dbx symbol tables and convert to internal format, for GDB.
   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* This module provides three functions: dbx_symfile_init,
   which initializes to read a symbol file; dbx_new_init, which 
   discards existing cached information when all symbols are being
   discarded; and dbx_symfile_read, which reads a symbol table
   from a file.

   dbx_symfile_read only does the minimum work necessary for letting the
   user "name" things symbolically; it does not read the entire symtab.
   Instead, it reads the external and static symbols and puts them in partial
   symbol tables.  When more extensive information is requested of a
   file, the corresponding partial symbol table is mutated into a full
   fledged symbol table by going back and reading the symbols
   for real.  dbx_psymtab_to_symtab() is the function that does this */

#include "defs.h"
#include <string.h>

#if defined(USG) || defined(__CYGNUSCLIB__)
#include <sys/types.h>
#include <fcntl.h>
#endif

#include <obstack.h>
#include <sys/param.h>
#ifndef	NO_SYS_FILE
#include <sys/file.h>
#endif
#include <sys/stat.h>
#include <ctype.h>
#include "symtab.h"
#include "breakpoint.h"
#include "command.h"
#include "target.h"
#include "gdbcore.h"		/* for bfd stuff */
#include "libbfd.h"		/* FIXME Secret internal BFD stuff (bfd_read) */
#include "libaout.h"	 	/* FIXME Secret internal BFD stuff for a.out */
#include "symfile.h"
#include "objfiles.h"
#include "buildsym.h"
#include "stabsread.h"
#include "gdb-stabs.h"
#include "demangle.h"
#include "language.h"		/* Needed inside partial-stab.h */
#include "complaints.h"

#include "aout/aout64.h"
#include "aout/stab_gnu.h"	/* We always use GNU stabs, not native, now */

#if !defined (SEEK_SET)
#define SEEK_SET 0
#define SEEK_CUR 1
#endif

/* Each partial symbol table entry contains a pointer to private data for the
   read_symtab() function to use when expanding a partial symbol table entry
   to a full symbol table entry.

   For dbxread this structure contains the offset within the file symbol table
   of first local symbol for this file, and length (in bytes) of the section
   of the symbol table devoted to this file's symbols (actually, the section
   bracketed may contain more than just this file's symbols).  It also contains
   further information needed to locate the symbols if they are in an ELF file.

   If ldsymlen is 0, the only reason for this thing's existence is the
   dependency list.  Nothing else will happen when it is read in.  */

#define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
#define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
#define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
#define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
#define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
#define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
#define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)

struct symloc {
  int ldsymoff;
  int ldsymlen;
  int symbol_size;
  int symbol_offset;
  int string_offset;
  int file_string_offset;
};

/* Macro to determine which symbols to ignore when reading the first symbol
   of a file.  Some machines override this definition. */
#ifndef IGNORE_SYMBOL
/* This code is used on Ultrix systems.  Ignore it */
#define IGNORE_SYMBOL(type)  (type == (int)N_NSYMS)
#endif

/* Macro for name of symbol to indicate a file compiled with gcc. */
#ifndef GCC_COMPILED_FLAG_SYMBOL
#define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled."
#endif

/* Macro for name of symbol to indicate a file compiled with gcc2. */
#ifndef GCC2_COMPILED_FLAG_SYMBOL
#define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled."
#endif

/* Define this as 1 if a pcc declaration of a char or short argument
   gives the correct address.  Otherwise assume pcc gives the
   address of the corresponding int, which is not the same on a
   big-endian machine.  */

#ifndef BELIEVE_PCC_PROMOTION
#define BELIEVE_PCC_PROMOTION 0
#endif

/* Remember what we deduced to be the source language of this psymtab. */

static enum language psymtab_language = language_unknown;

/* Nonzero means give verbose info on gdb action.  From main.c.  */
extern int info_verbose;

/* The BFD for this file -- implicit parameter to next_symbol_text.  */

static bfd *symfile_bfd;

/* The size of each symbol in the symbol file (in external form).
   This is set by dbx_symfile_read when building psymtabs, and by
   dbx_psymtab_to_symtab when building symtabs.  */

static unsigned symbol_size;

/* This is the offset of the symbol table in the executable file */
static unsigned symbol_table_offset;

/* This is the offset of the string table in the executable file */
static unsigned string_table_offset;

/* For elf+stab executables, the n_strx field is not a simple index
   into the string table.  Instead, each .o file has a base offset
   in the string table, and the associated symbols contain offsets
   from this base.  The following two variables contain the base
   offset for the current and next .o files. */
static unsigned int file_string_table_offset;
static unsigned int next_file_string_table_offset;

/* Complaints about the symbols we have encountered.  */

struct complaint lbrac_complaint = 
  {"bad block start address patched", 0, 0};

struct complaint string_table_offset_complaint =
  {"bad string table offset in symbol %d", 0, 0};

struct complaint unknown_symtype_complaint =
  {"unknown symbol type %s", 0, 0};

struct complaint unknown_symchar_complaint =
  {"unknown symbol type character `%c'", 0, 0};

struct complaint lbrac_rbrac_complaint =
  {"block start larger than block end", 0, 0};

struct complaint lbrac_unmatched_complaint =
  {"unmatched N_LBRAC before symtab pos %d", 0, 0};

struct complaint lbrac_mismatch_complaint =
  {"N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d", 0, 0};

struct complaint repeated_header_complaint =
  {"\"repeated\" header file not previously seen, at symtab pos %d", 0, 0};

struct complaint repeated_header_name_complaint =
  {"\"repeated\" header file not previously seen, named %s", 0, 0};

/* During initial symbol readin, we need to have a structure to keep
   track of which psymtabs have which bincls in them.  This structure
   is used during readin to setup the list of dependencies within each
   partial symbol table. */

struct header_file_location
{
  char *name;			/* Name of header file */
  int instance;			/* See above */
  struct partial_symtab *pst;	/* Partial symtab that has the
				   BINCL/EINCL defs for this file */
};

/* The actual list and controling variables */
static struct header_file_location *bincl_list, *next_bincl;
static int bincls_allocated;

/* Local function prototypes */

static void
free_header_files PARAMS ((void));

static void
init_header_files PARAMS ((void));

static struct pending *
copy_pending PARAMS ((struct pending *, int, struct pending *));

static void
read_ofile_symtab PARAMS ((struct partial_symtab *));

static void
dbx_psymtab_to_symtab PARAMS ((struct partial_symtab *));

static void
dbx_psymtab_to_symtab_1 PARAMS ((struct partial_symtab *));

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

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

static struct partial_symtab *
find_corresponding_bincl_psymtab PARAMS ((char *, int));

static void
add_bincl_to_list PARAMS ((struct partial_symtab *, char *, int));

static void
init_bincl_list PARAMS ((int, struct objfile *));

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

static char *
dbx_next_symbol_text PARAMS ((void));

static void
fill_symbuf PARAMS ((bfd *));

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

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

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

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

static void
record_minimal_symbol PARAMS ((char *, CORE_ADDR, int, struct objfile *));

static void
add_new_header_file PARAMS ((char *, int));

static void
add_old_header_file PARAMS ((char *, int));

static void
add_this_object_header_file PARAMS ((int));

/* Free up old header file tables */

static void
free_header_files ()
{
  register int i;

  if (header_files != NULL)
    {
      for (i = 0; i < n_header_files; i++)
	{
	  free (header_files[i].name);
	}
      free ((PTR)header_files);
      header_files = NULL;
      n_header_files = 0;
    }
  if (this_object_header_files)
    {
      free ((PTR)this_object_header_files);
      this_object_header_files = NULL;
    }
  n_allocated_header_files = 0;
  n_allocated_this_object_header_files = 0;
}

/* Allocate new header file tables */

static void
init_header_files ()
{
  n_header_files = 0;
  n_allocated_header_files = 10;
  header_files = (struct header_file *)
    xmalloc (10 * sizeof (struct header_file));

  n_allocated_this_object_header_files = 10;
  this_object_header_files = (int *) xmalloc (10 * sizeof (int));
}

/* Add header file number I for this object file
   at the next successive FILENUM.  */

static void
add_this_object_header_file (i)
     int i;
{
  if (n_this_object_header_files == n_allocated_this_object_header_files)
    {
      n_allocated_this_object_header_files *= 2;
      this_object_header_files
	= (int *) xrealloc ((char *) this_object_header_files,
			    n_allocated_this_object_header_files * sizeof (int));
    }

  this_object_header_files[n_this_object_header_files++] = i;
}

/* Add to this file an "old" header file, one already seen in
   a previous object file.  NAME is the header file's name.
   INSTANCE is its instance code, to select among multiple
   symbol tables for the same header file.  */

static void
add_old_header_file (name, instance)
     char *name;
     int instance;
{
  register struct header_file *p = header_files;
  register int i;

  for (i = 0; i < n_header_files; i++)
    if (STREQ (p[i].name, name) && instance == p[i].instance)
      {
	add_this_object_header_file (i);
	return;
      }
  complain (&repeated_header_complaint, symnum);
  complain (&repeated_header_name_complaint, name);
}

/* Add to this file a "new" header file: definitions for its types follow.
   NAME is the header file's name.
   Most often this happens only once for each distinct header file,
   but not necessarily.  If it happens more than once, INSTANCE has
   a different value each time, and references to the header file
   use INSTANCE values to select among them.

   dbx output contains "begin" and "end" markers for each new header file,
   but at this level we just need to know which files there have been;
   so we record the file when its "begin" is seen and ignore the "end".  */

static void
add_new_header_file (name, instance)
     char *name;
     int instance;
{
  register int i;

  /* Make sure there is room for one more header file.  */

  if (n_header_files == n_allocated_header_files)
    {
      n_allocated_header_files *= 2;
      header_files = (struct header_file *)
	xrealloc ((char *) header_files,
		  (n_allocated_header_files * sizeof (struct header_file)));
    }

  /* Create an entry for this header file.  */

  i = n_header_files++;
  header_files[i].name = savestring (name, strlen(name));
  header_files[i].instance = instance;
  header_files[i].length = 10;
  header_files[i].vector
    = (struct type **) xmalloc (10 * sizeof (struct type *));
  memset (header_files[i].vector, 0, 10 * sizeof (struct type *));

  add_this_object_header_file (i);
}

#if 0
static struct type **
explicit_lookup_type (real_filenum, index)
     int real_filenum, index;
{
  register struct header_file *f = &header_files[real_filenum];

  if (index >= f->length)
    {
      f->length *= 2;
      f->vector = (struct type **)
	xrealloc (f->vector, f->length * sizeof (struct type *));
      bzero (&f->vector[f->length / 2],
	     f->length * sizeof (struct type *) / 2);
    }
  return &f->vector[index];
}
#endif

static void
record_minimal_symbol (name, address, type, objfile)
     char *name;
     CORE_ADDR address;
     int type;
     struct objfile *objfile;
{
  enum minimal_symbol_type ms_type;

  switch (type)
    {
    case N_TEXT | N_EXT:  ms_type = mst_text; break;
    case N_DATA | N_EXT:  ms_type = mst_data; break;
    case N_BSS | N_EXT:   ms_type = mst_bss;  break;
    case N_ABS | N_EXT:   ms_type = mst_abs;  break;
#ifdef N_SETV
    case N_SETV | N_EXT:  ms_type = mst_data; break;
    case N_SETV:
      /* I don't think this type actually exists; since a N_SETV is the result
	 of going over many .o files, it doesn't make sense to have one
	 file local.  */
      ms_type = mst_file_data;
      break;
#endif
    case N_NBTEXT:
    case N_FN:
    case N_FN_SEQ:
    case N_TEXT:
      ms_type = mst_file_text;
      break;

    case N_DATA:
      ms_type = mst_file_data;

      /* Check for __DYNAMIC, which is used by Sun shared libraries. 
	 Record it as global even if it's local, not global, so
	 lookup_minimal_symbol can find it.
	 FIXME:  this might want to check for _DYNAMIC and the current
	 symbol_leading_char.  */
      if (name[8] == 'C' && STREQ ("__DYNAMIC", name))
	ms_type = mst_data;

      /* Same with virtual function tables, both global and static.  */
      {
	char *tempstring = name;
	if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd))
	  ++tempstring;
	if (VTBL_PREFIX_P ((tempstring)))
	  ms_type = mst_data;
      }
      break;

    case N_BSS:
      ms_type = mst_file_bss;
      break;

    default:      ms_type = mst_unknown; break;
  }

  prim_record_minimal_symbol
    (obsavestring (name, strlen (name), &objfile -> symbol_obstack),
     address,
     ms_type);
}

/* Scan and build partial symbols for a symbol file.
   We have been initialized by a call to dbx_symfile_init, which 
   put all the relevant info into a "struct dbx_symfile_info",
   hung off the objfile structure.

   SECTION_OFFSETS contains offsets relative to which the symbols in the
   various sections are (depending where the sections were actually loaded).
   MAINLINE is true if we are reading the main symbol
   table (as opposed to a shared lib or dynamically loaded file).  */

static void
dbx_symfile_read (objfile, section_offsets, mainline)
     struct objfile *objfile;
     struct section_offsets *section_offsets;
     int mainline;	/* FIXME comments above */
{
  bfd *sym_bfd;
  int val;
  struct cleanup *back_to;

  sym_bfd = objfile->obfd;
  val = bfd_seek (objfile->obfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET);
  if (val < 0)
    perror_with_name (objfile->name);

  /* If we are reinitializing, or if we have never loaded syms yet, init */
  if (mainline || objfile->global_psymbols.size == 0 || objfile->static_psymbols.size == 0)
    init_psymbol_list (objfile);

  symbol_size = DBX_SYMBOL_SIZE (objfile);
  symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);

  pending_blocks = 0;
  back_to = make_cleanup (really_free_pendings, 0);

  init_minimal_symbol_collection ();
  make_cleanup (discard_minimal_symbols, 0);

  /* Now that the symbol table data of the executable file are all in core,
     process them and define symbols accordingly.  */

  read_dbx_symtab (section_offsets, objfile,
		   bfd_section_vma  (sym_bfd, DBX_TEXT_SECT (objfile)),
		   bfd_section_size (sym_bfd, DBX_TEXT_SECT (objfile)));

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

  install_minimal_symbols (objfile);

  if (!have_partial_symbols ()) {
    wrap_here ("");
    printf_filtered ("(no debugging symbols found)...");
    wrap_here ("");
  }

  do_cleanups (back_to);
}

/* 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).  */

static void
dbx_new_init (ignore)
     struct objfile *ignore;
{
  stabsread_new_init ();
  buildsym_new_init ();
  init_header_files ();
}


/* dbx_symfile_init ()
   is the dbx-specific initialization routine for reading symbols.
   It is passed a struct objfile which contains, among other things,
   the BFD for the file whose symbols are being read, and a slot for a pointer
   to "private data" which we fill with goodies.

   We read the string table into malloc'd space and stash a pointer to it.

   Since BFD doesn't know how to read debug symbols in a format-independent
   way (and may never do so...), we have to do it ourselves.  We will never
   be called unless this is an a.out (or very similar) file. 
   FIXME, there should be a cleaner peephole into the BFD environment here.  */

#define DBX_STRINGTAB_SIZE_SIZE sizeof(long)   /* FIXME */

static void
dbx_symfile_init (objfile)
     struct objfile *objfile;
{
  int val;
  bfd *sym_bfd = objfile->obfd;
  char *name = bfd_get_filename (sym_bfd);
  unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE];

  /* Allocate struct to keep track of the symfile */
  objfile->sym_private = (PTR)
    xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));

  /* FIXME POKING INSIDE BFD DATA STRUCTURES */
#define	STRING_TABLE_OFFSET	(sym_bfd->origin + obj_str_filepos (sym_bfd))
#define	SYMBOL_TABLE_OFFSET	(sym_bfd->origin + obj_sym_filepos (sym_bfd))

  /* FIXME POKING INSIDE BFD DATA STRUCTURES */

  DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
  DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
  if (!DBX_TEXT_SECT (objfile))
    error ("Can't find .text section in symbol file");

  DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd);
  DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
  DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;

  /* Read the string table and stash it away in the psymbol_obstack.  It is
     only needed as long as we need to expand psymbols into full symbols,
     so when we blow away the psymbol the string table goes away as well.
     Note that gdb used to use the results of attempting to malloc the
     string table, based on the size it read, as a form of sanity check
     for botched byte swapping, on the theory that a byte swapped string
     table size would be so totally bogus that the malloc would fail.  Now
     that we put in on the psymbol_obstack, we can't do this since gdb gets
     a fatal error (out of virtual memory) if the size is bogus.  We can
     however at least check to see if the size is less than the size of
     the size field itself, or larger than the size of the entire file.
     Note that all valid string tables have a size greater than zero, since
     the bytes used to hold the size are included in the count. */

  if (STRING_TABLE_OFFSET == 0)
    {
      /* It appears that with the existing bfd code, STRING_TABLE_OFFSET
	 will never be zero, even when there is no string table.  This
	 would appear to be a bug in bfd. */
      DBX_STRINGTAB_SIZE (objfile) = 0;
      DBX_STRINGTAB (objfile) = NULL;
    }
  else
    {
      val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
      if (val < 0)
	perror_with_name (name);
      
      memset ((PTR) size_temp, 0, sizeof (size_temp));
      val = bfd_read ((PTR) size_temp, sizeof (size_temp), 1, sym_bfd);
      if (val < 0)
	{
	  perror_with_name (name);
	}
      else if (val == 0)
	{
	  /* With the existing bfd code, STRING_TABLE_OFFSET will be set to
	     EOF if there is no string table, and attempting to read the size
	     from EOF will read zero bytes. */
	  DBX_STRINGTAB_SIZE (objfile) = 0;
	  DBX_STRINGTAB (objfile) = NULL;
	}
      else
	{
	  /* Read some data that would appear to be the string table size.
	     If there really is a string table, then it is probably the right
	     size.  Byteswap if necessary and validate the size.  Note that
	     the minimum is DBX_STRINGTAB_SIZE_SIZE.  If we just read some
	     random data that happened to be at STRING_TABLE_OFFSET, because
	     bfd can't tell us there is no string table, the sanity checks may
	     or may not catch this. */
	  DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
	  
	  if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp)
	      || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
	    error ("ridiculous string table size (%d bytes).",
		   DBX_STRINGTAB_SIZE (objfile));
	  
	  DBX_STRINGTAB (objfile) =
	    (char *) obstack_alloc (&objfile -> psymbol_obstack,
				    DBX_STRINGTAB_SIZE (objfile));
	  
	  /* Now read in the string table in one big gulp.  */
	  
	  val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
	  if (val < 0)
	    perror_with_name (name);
	  val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
			  sym_bfd);
	  if (val != DBX_STRINGTAB_SIZE (objfile))
	    perror_with_name (name);
	}
    }
}

/* 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
dbx_symfile_finish (objfile)
     struct objfile *objfile;
{
  if (objfile->sym_private != NULL)
    {
      mfree (objfile -> md, objfile->sym_private);
    }
  free_header_files ();
}


/* Buffer for reading the symbol table entries.  */
static struct internal_nlist symbuf[4096];
static int symbuf_idx;
static int symbuf_end;

/* Name of last function encountered.  Used in Solaris to approximate
   object file boundaries.  */
static char *last_function_name;

/* The address in memory of the string table of the object file we are
   reading (which might not be the "main" object file, but might be a
   shared library or some other dynamically loaded thing).  This is set
   by read_dbx_symtab when building psymtabs, and by read_ofile_symtab 
   when building symtabs, and is used only by next_symbol_text.  */
static char *stringtab_global;

/* Refill the symbol table input buffer
   and set the variables that control fetching entries from it.
   Reports an error if no data available.
   This function can read past the end of the symbol table
   (into the string table) but this does no harm.  */

static void
fill_symbuf (sym_bfd)
     bfd *sym_bfd;
{
  int nbytes = bfd_read ((PTR)symbuf, sizeof (symbuf), 1, sym_bfd);
  if (nbytes < 0)
    perror_with_name (bfd_get_filename (sym_bfd));
  else if (nbytes == 0)
    error ("Premature end of file reading symbol table");
  symbuf_end = nbytes / symbol_size;
  symbuf_idx = 0;
}

#define SWAP_SYMBOL(symp, abfd) \
  { \
    (symp)->n_strx = bfd_h_get_32(abfd,			\
				(unsigned char *)&(symp)->n_strx);	\
    (symp)->n_desc = bfd_h_get_16 (abfd,			\
				(unsigned char *)&(symp)->n_desc);  	\
    (symp)->n_value = bfd_h_get_32 (abfd,			\
				(unsigned char *)&(symp)->n_value); 	\
  }

/* Invariant: The symbol pointed to by symbuf_idx is the first one
   that hasn't been swapped.  Swap the symbol at the same time
   that symbuf_idx is incremented.  */

/* dbx allows the text of a symbol name to be continued into the
   next symbol name!  When such a continuation is encountered
   (a \ at the end of the text of a name)
   call this function to get the continuation.  */

static char *
dbx_next_symbol_text ()
{
  if (symbuf_idx == symbuf_end)
    fill_symbuf (symfile_bfd);
  symnum++;
  SWAP_SYMBOL(&symbuf[symbuf_idx], symfile_bfd);
  return symbuf[symbuf_idx++].n_strx + stringtab_global
	  + file_string_table_offset;
}

/* Initializes storage for all of the partial symbols that will be
   created by read_dbx_symtab and subsidiaries.  */

static void
init_psymbol_list (objfile)
     struct objfile *objfile;
{
  /* Free any previously allocated psymbol lists.  */
  if (objfile -> global_psymbols.list)
    mfree (objfile -> md, (PTR)objfile -> global_psymbols.list);
  if (objfile -> static_psymbols.list)
    mfree (objfile -> md, (PTR)objfile -> static_psymbols.list);

  /* Current best guess is that there are approximately a twentieth
     of the total symbols (in a debugging file) are global or static
     oriented symbols */
  objfile -> global_psymbols.size = DBX_SYMCOUNT (objfile) / 10;
  objfile -> static_psymbols.size = DBX_SYMCOUNT (objfile) / 10;
  objfile -> global_psymbols.next = objfile -> global_psymbols.list = (struct partial_symbol *)
    xmmalloc (objfile -> md, objfile -> global_psymbols.size * sizeof (struct partial_symbol));
  objfile -> static_psymbols.next = objfile -> static_psymbols.list = (struct partial_symbol *)
    xmmalloc (objfile -> md, objfile -> static_psymbols.size * sizeof (struct partial_symbol));
}

/* Initialize the list of bincls to contain none and have some
   allocated.  */

static void
init_bincl_list (number, objfile)
     int number;
     struct objfile *objfile;
{
  bincls_allocated = number;
  next_bincl = bincl_list = (struct header_file_location *)
    xmmalloc (objfile -> md, bincls_allocated * sizeof(struct header_file_location));
}

/* Add a bincl to the list.  */

static void
add_bincl_to_list (pst, name, instance)
     struct partial_symtab *pst;
     char *name;
     int instance;
{
  if (next_bincl >= bincl_list + bincls_allocated)
    {
      int offset = next_bincl - bincl_list;
      bincls_allocated *= 2;
      bincl_list = (struct header_file_location *)
	xmrealloc (pst->objfile->md, (char *)bincl_list,
		  bincls_allocated * sizeof (struct header_file_location));
      next_bincl = bincl_list + offset;
    }
  next_bincl->pst = pst;
  next_bincl->instance = instance;
  next_bincl++->name = name;
}

/* Given a name, value pair, find the corresponding
   bincl in the list.  Return the partial symtab associated
   with that header_file_location.  */

static struct partial_symtab *
find_corresponding_bincl_psymtab (name, instance)
     char *name;
     int instance;
{
  struct header_file_location *bincl;

  for (bincl = bincl_list; bincl < next_bincl; bincl++)
    if (bincl->instance == instance
	&& STREQ (name, bincl->name))
      return bincl->pst;

  return (struct partial_symtab *) 0;
}

/* Free the storage allocated for the bincl list.  */

static void
free_bincl_list (objfile)
     struct objfile *objfile;
{
  mfree (objfile -> md, (PTR)bincl_list);
  bincls_allocated = 0;
}

/* Given pointers to an a.out symbol table in core containing dbx
   style data, setup partial_symtab's describing each source file for
   which debugging information is available.
   SYMFILE_NAME is the name of the file we are reading from
   and SECTION_OFFSETS is the set of offsets for the various sections
   of the file (a set of zeros if the mainline program).  */

static void
read_dbx_symtab (section_offsets, objfile, text_addr, text_size)
     struct section_offsets *section_offsets;
     struct objfile *objfile;
     CORE_ADDR text_addr;
     int text_size;
{
  register struct internal_nlist *bufp = 0;	/* =0 avoids gcc -Wall glitch */
  register char *namestring;
  int nsl;
  int past_first_source_file = 0;
  CORE_ADDR last_o_file_start = 0;
  struct cleanup *back_to;
  bfd *abfd;

  /* End of the text segment of the executable file.  */
  CORE_ADDR end_of_text_addr;

  /* Current partial symtab */
  struct partial_symtab *pst;

  /* List of current psymtab's include files */
  char **psymtab_include_list;
  int includes_allocated;
  int includes_used;

  /* Index within current psymtab dependency list */
  struct partial_symtab **dependency_list;
  int dependencies_used, dependencies_allocated;

  /* FIXME.  We probably want to change stringtab_global rather than add this
     while processing every symbol entry.  FIXME.  */
  file_string_table_offset = 0;
  next_file_string_table_offset = 0;

  stringtab_global = DBX_STRINGTAB (objfile);
  
  pst = (struct partial_symtab *) 0;

  includes_allocated = 30;
  includes_used = 0;
  psymtab_include_list = (char **) alloca (includes_allocated *
					   sizeof (char *));

  dependencies_allocated = 30;
  dependencies_used = 0;
  dependency_list =
    (struct partial_symtab **) alloca (dependencies_allocated *
				       sizeof (struct partial_symtab *));

  /* Init bincl list */
  init_bincl_list (20, objfile);
  back_to = make_cleanup (free_bincl_list, objfile);

  last_source_file = NULL;

#ifdef END_OF_TEXT_DEFAULT
  end_of_text_addr = END_OF_TEXT_DEFAULT;
#else
  end_of_text_addr = text_addr + section_offsets->offsets[SECT_OFF_TEXT]
			       + text_size;	/* Relocate */
#endif

  symfile_bfd = objfile->obfd;	/* For next_text_symbol */
  abfd = objfile->obfd;
  symbuf_end = symbuf_idx = 0;
  next_symbol_text_func = dbx_next_symbol_text;

  for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++)
    {
      /* Get the symbol for this run and pull out some info */
      QUIT;	/* allow this to be interruptable */
      if (symbuf_idx == symbuf_end)
	fill_symbuf (abfd);
      bufp = &symbuf[symbuf_idx++];

      /*
       * Special case to speed up readin.
       */
      if (bufp->n_type == (unsigned char)N_SLINE) continue;

      SWAP_SYMBOL (bufp, abfd);

      /* Ok.  There is a lot of code duplicated in the rest of this
         switch statement (for efficiency reasons).  Since I don't
         like duplicating code, I will do my penance here, and
         describe the code which is duplicated:

	 *) The assignment to namestring.
	 *) The call to strchr.
	 *) The addition of a partial symbol the the two partial
	    symbol lists.  This last is a large section of code, so
	    I've imbedded it in the following macro.
	 */
      
/* Set namestring based on bufp.  If the string table index is invalid, 
   give a fake name, and print a single error message per symbol file read,
   rather than abort the symbol reading or flood the user with messages.  */

/*FIXME: Too many adds and indirections in here for the inner loop.  */
#define SET_NAMESTRING()\
  if (((unsigned)bufp->n_strx + file_string_table_offset) >=		\
      DBX_STRINGTAB_SIZE (objfile)) {					\
    complain (&string_table_offset_complaint, symnum);			\
    namestring = "foo";							\
  } else								\
    namestring = bufp->n_strx + file_string_table_offset +		\
		 DBX_STRINGTAB (objfile)

#define CUR_SYMBOL_TYPE bufp->n_type
#define CUR_SYMBOL_VALUE bufp->n_value
#define DBXREAD_ONLY
#define START_PSYMTAB(ofile,secoff,fname,low,symoff,global_syms,static_syms)\
  start_psymtab(ofile, secoff, fname, low, symoff, global_syms, static_syms)
#define END_PSYMTAB(pst,ilist,ninc,c_off,c_text,dep_list,n_deps)\
  end_psymtab(pst,ilist,ninc,c_off,c_text,dep_list,n_deps)

#include "partial-stab.h"
    }

  /* If there's stuff to be cleaned up, clean it up.  */
  if (DBX_SYMCOUNT (objfile) > 0			/* We have some syms */
/*FIXME, does this have a bug at start address 0? */
      && last_o_file_start
      && objfile -> ei.entry_point < bufp->n_value
      && objfile -> ei.entry_point >= last_o_file_start)
    {
      objfile -> ei.entry_file_lowpc = last_o_file_start;
      objfile -> ei.entry_file_highpc = bufp->n_value;
    }

  if (pst)
    {
      end_psymtab (pst, psymtab_include_list, includes_used,
		   symnum * symbol_size, end_of_text_addr,
		   dependency_list, dependencies_used);
    }

  do_cleanups (back_to);
}

/* Allocate and partially fill a partial symtab.  It will be
   completely filled at the end of the symbol list.

   SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
   is the address relative to which its symbols are (incremental) or 0
   (normal). */


struct partial_symtab *
start_psymtab (objfile, section_offsets,
	       filename, textlow, ldsymoff, global_syms, static_syms)
     struct objfile *objfile;
     struct section_offsets *section_offsets;
     char *filename;
     CORE_ADDR textlow;
     int ldsymoff;
     struct partial_symbol *global_syms;
     struct partial_symbol *static_syms;
{
  struct partial_symtab *result =
      start_psymtab_common(objfile, section_offsets,
			   filename, textlow, global_syms, static_syms);

  result->read_symtab_private = (char *)
    obstack_alloc (&objfile -> psymbol_obstack, sizeof (struct symloc));
  LDSYMOFF(result) = ldsymoff;
  result->read_symtab = dbx_psymtab_to_symtab;
  SYMBOL_SIZE(result) = symbol_size;
  SYMBOL_OFFSET(result) = symbol_table_offset;
  STRING_OFFSET(result) = string_table_offset;
  FILE_STRING_OFFSET(result) = file_string_table_offset;

  /* If we're handling an ELF file, drag some section-relocation info
     for this source file out of the ELF symbol table, to compensate for
     Sun brain death.  This replaces the section_offsets in this psymtab,
     if successful.  */
  elfstab_offset_sections (objfile, result);

  /* Deduce the source language from the filename for this psymtab. */
  psymtab_language = deduce_language_from_filename (filename);

  return result;
}

/* Close off the current usage of a partial_symbol table entry.  This
   involves setting the correct number of includes (with a realloc),
   setting the high text mark, setting the symbol length in the
   executable, and setting the length of the global and static lists
   of psymbols.

   The global symbols and static symbols are then seperately sorted.

   Then the partial symtab is put on the global list.
   *** List variables and peculiarities of same. ***
   */

void
end_psymtab (pst, include_list, num_includes, capping_symbol_offset,
	     capping_text, dependency_list, number_dependencies)
     struct partial_symtab *pst;
     char **include_list;
     int num_includes;
     int capping_symbol_offset;
     CORE_ADDR capping_text;
     struct partial_symtab **dependency_list;
     int number_dependencies;
/*     struct partial_symbol *capping_global, *capping_static;*/
{
  int i;
  struct partial_symtab *p1;
  struct objfile *objfile = pst -> objfile;

  if (capping_symbol_offset != -1)
      LDSYMLEN(pst) = capping_symbol_offset - LDSYMOFF(pst);
  pst->texthigh = capping_text;

  /* Under Solaris, the N_SO symbols always have a value of 0,
     instead of the usual address of the .o file.  Therefore,
     we have to do some tricks to fill in texthigh and textlow.
     The first trick is in partial-stab.h: if we see a static
     or global function, and the textlow for the current pst
     is still 0, then we use that function's address for 
     the textlow of the pst.

     Now, to fill in texthigh, we remember the last function seen
     in the .o file (also in partial-stab.h).  Also, there's a hack in
     bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
     to here via the misc_info field.  Therefore, we can fill in
     a reliable texthigh by taking the address plus size of the
     last function in the file.

     Unfortunately, that does not cover the case where the last function
     in the file is static.  See the paragraph below for more comments
     on this situation.

     Finally, if we have a valid textlow for the current file, we run
     down the partial_symtab_list filling in previous texthighs that
     are still unknown.  */

  if (pst->texthigh == 0 && last_function_name) {
    char *p;
    int n;
    struct minimal_symbol *minsym;

    p = strchr (last_function_name, ':');
    if (p == NULL)
      p = last_function_name;
    n = p - last_function_name;
    p = alloca (n + 1);
    strncpy (p, last_function_name, n);
    p[n] = 0;
    
    minsym = lookup_minimal_symbol (p, objfile);

    if (minsym) {
      pst->texthigh = SYMBOL_VALUE_ADDRESS (minsym) +
	(int) MSYMBOL_INFO (minsym);
    } else {
      /* This file ends with a static function, and it's
	 difficult to imagine how hard it would be to track down
	 the elf symbol.  Luckily, most of the time no one will notice,
	 since the next file will likely be compiled with -g, so
	 the code below will copy the first fuction's start address 
	 back to our texthigh variable.  (Also, if this file is the
	 last one in a dynamically linked program, texthigh already
	 has the right value.)  If the next file isn't compiled
	 with -g, then the last function in this file winds up owning
	 all of the text space up to the next -g file, or the end (minus
	 shared libraries).  This only matters for single stepping,
	 and even then it will still work, except that it will single
	 step through all of the covered functions, instead of setting
	 breakpoints around them as it usualy does.  This makes it
	 pretty slow, but at least it doesn't fail.

	 We can fix this with a fairly big change to bfd, but we need
	 to coordinate better with Cygnus if we want to do that.  FIXME.  */
    }
    last_function_name = NULL;
  }

  /* this test will be true if the last .o file is only data */
  if (pst->textlow == 0)
    pst->textlow = pst->texthigh;

  /* If we know our own starting text address, then walk through all other
     psymtabs for this objfile, and if any didn't know their ending text
     address, set it to our starting address.  Take care to not set our
     own ending address to our starting address, nor to set addresses on
     `dependency' files that have both textlow and texthigh zero.  */
  if (pst->textlow) {
    ALL_OBJFILE_PSYMTABS (objfile, p1) {
      if (p1->texthigh == 0  && p1->textlow != 0 && p1 != pst) {
	p1->texthigh = pst->textlow;
	/* if this file has only data, then make textlow match texthigh */
	if (p1->textlow == 0)
	  p1->textlow = p1->texthigh;
      }
    }
  }

  /* End of kludge for patching Solaris textlow and texthigh.  */


  pst->n_global_syms =
    objfile->global_psymbols.next - (objfile->global_psymbols.list + pst->globals_offset);
  pst->n_static_syms =
    objfile->static_psymbols.next - (objfile->static_psymbols.list + pst->statics_offset);

  pst->number_of_dependencies = number_dependencies;
  if (number_dependencies)
    {
      pst->dependencies = (struct partial_symtab **)
	obstack_alloc (&objfile->psymbol_obstack,
		       number_dependencies * sizeof (struct partial_symtab *));
      memcpy (pst->dependencies, dependency_list,
	     number_dependencies * sizeof (struct partial_symtab *));
    }
  else
    pst->dependencies = 0;

  for (i = 0; i < num_includes; i++)
    {
      struct partial_symtab *subpst =
	allocate_psymtab (include_list[i], objfile);

      subpst->section_offsets = pst->section_offsets;
      subpst->read_symtab_private =
	  (char *) obstack_alloc (&objfile->psymbol_obstack,
				  sizeof (struct symloc));
      LDSYMOFF(subpst) =
	LDSYMLEN(subpst) =
	  subpst->textlow =
	    subpst->texthigh = 0;

      /* We could save slight bits of space by only making one of these,
	 shared by the entire set of include files.  FIXME-someday.  */
      subpst->dependencies = (struct partial_symtab **)
	obstack_alloc (&objfile->psymbol_obstack,
		       sizeof (struct partial_symtab *));
      subpst->dependencies[0] = pst;
      subpst->number_of_dependencies = 1;

      subpst->globals_offset =
	subpst->n_global_syms =
	  subpst->statics_offset =
	    subpst->n_static_syms = 0;

      subpst->readin = 0;
      subpst->symtab = 0;
      subpst->read_symtab = pst->read_symtab;
    }

  sort_pst_symbols (pst);

  /* If there is already a psymtab or symtab for a file of this name, remove it.
     (If there is a symtab, more drastic things also happen.)
     This happens in VxWorks.  */
  free_named_symtabs (pst->filename);

  if (num_includes == 0
   && number_dependencies == 0
   && pst->n_global_syms == 0
   && pst->n_static_syms == 0) {
    /* Throw away this psymtab, it's empty.  We can't deallocate it, since
       it is on the obstack, but we can forget to chain it on the list.  */
    struct partial_symtab *prev_pst;

    /* First, snip it out of the psymtab chain */

    if (pst->objfile->psymtabs == pst)
      pst->objfile->psymtabs = pst->next;
    else
      for (prev_pst = pst->objfile->psymtabs; prev_pst; prev_pst = pst->next)
	if (prev_pst->next == pst)
	  prev_pst->next = pst->next;

    /* Next, put it on a free list for recycling */

    pst->next = pst->objfile->free_psymtabs;
    pst->objfile->free_psymtabs = pst;
  }
}

static void
dbx_psymtab_to_symtab_1 (pst)
     struct partial_symtab *pst;
{
  struct cleanup *old_chain;
  int i;
  
  if (!pst)
    return;

  if (pst->readin)
    {
      fprintf (stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
	       pst->filename);
      return;
    }

  /* Read in all partial symtabs on which this one is dependent */
  for (i = 0; i < pst->number_of_dependencies; i++)
    if (!pst->dependencies[i]->readin)
      {
	/* Inform about additional files that need to be read in.  */
	if (info_verbose)
	  {
	    fputs_filtered (" ", stdout);
	    wrap_here ("");
	    fputs_filtered ("and ", stdout);
	    wrap_here ("");
	    printf_filtered ("%s...", pst->dependencies[i]->filename);
	    wrap_here ("");		/* Flush output */
	    fflush (stdout);
	  }
	dbx_psymtab_to_symtab_1 (pst->dependencies[i]);
      }

  if (LDSYMLEN(pst))		/* Otherwise it's a dummy */
    {
      /* Init stuff necessary for reading in symbols */
      stabsread_init ();
      buildsym_init ();
      old_chain = make_cleanup (really_free_pendings, 0);
      file_string_table_offset = FILE_STRING_OFFSET (pst);
      symbol_size = SYMBOL_SIZE (pst);

      /* Read in this file's symbols */
      bfd_seek (pst->objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET);
      read_ofile_symtab (pst);
      sort_symtab_syms (pst->symtab);

      do_cleanups (old_chain);
    }

  pst->readin = 1;
}

/* Read in all of the symbols for a given psymtab for real.
   Be verbose about it if the user wants that.  */

static void
dbx_psymtab_to_symtab (pst)
     struct partial_symtab *pst;
{
  bfd *sym_bfd;

  if (!pst)
    return;

  if (pst->readin)
    {
      fprintf (stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
	       pst->filename);
      return;
    }

  if (LDSYMLEN(pst) || pst->number_of_dependencies)
    {
      /* Print the message now, before reading the string table,
	 to avoid disconcerting pauses.  */
      if (info_verbose)
	{
	  printf_filtered ("Reading in symbols for %s...", pst->filename);
	  fflush (stdout);
	}

      sym_bfd = pst->objfile->obfd;

      next_symbol_text_func = dbx_next_symbol_text;

      dbx_psymtab_to_symtab_1 (pst);

      /* Match with global symbols.  This only needs to be done once,
         after all of the symtabs and dependencies have been read in.   */
      scan_file_globals (pst->objfile);

      /* Finish up the debug error message.  */
      if (info_verbose)
	printf_filtered ("done.\n");
    }
}

/* Read in a defined section of a specific object file's symbols. */
  
static void
read_ofile_symtab (pst)
     struct partial_symtab *pst;
{
  register char *namestring;
  register struct internal_nlist *bufp;
  unsigned char type;
  unsigned max_symnum;
  register bfd *abfd;
  struct symtab *rtn;
  struct objfile *objfile;
  int sym_offset;		/* Offset to start of symbols to read */
  int sym_size;			/* Size of symbols to read */
  CORE_ADDR text_offset;	/* Start of text segment for symbols */
  int text_size;		/* Size of text segment for symbols */
  struct section_offsets *section_offsets;

  objfile = pst->objfile;
  sym_offset = LDSYMOFF(pst);
  sym_size = LDSYMLEN(pst);
  text_offset = pst->textlow;
  text_size = pst->texthigh - pst->textlow;
  section_offsets = pst->section_offsets;

  current_objfile = objfile;
  subfile_stack = NULL;

  stringtab_global = DBX_STRINGTAB (objfile);
  last_source_file = NULL;

  abfd = objfile->obfd;
  symfile_bfd = objfile->obfd;	/* Implicit param to next_text_symbol */
  symbuf_end = symbuf_idx = 0;

  /* It is necessary to actually read one symbol *before* the start
     of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL
     occurs before the N_SO symbol.

     Detecting this in read_dbx_symtab
     would slow down initial readin, so we look for it here instead.  */
  if (!processing_acc_compilation && sym_offset >= (int)symbol_size)
    {
      bfd_seek (symfile_bfd, sym_offset - symbol_size, SEEK_CUR);
      fill_symbuf (abfd);
      bufp = &symbuf[symbuf_idx++];
      SWAP_SYMBOL (bufp, abfd);

      SET_NAMESTRING ();

      processing_gcc_compilation = 0;
      if (bufp->n_type == N_TEXT)
	{
	  if (STREQ (namestring, GCC_COMPILED_FLAG_SYMBOL))
	    processing_gcc_compilation = 1;
	  else if (STREQ (namestring, GCC2_COMPILED_FLAG_SYMBOL))
	    processing_gcc_compilation = 2;
	}

      /* Try to select a C++ demangling based on the compilation unit
	 producer. */

      if (processing_gcc_compilation)
	{
	  if (AUTO_DEMANGLING)
	    {
	      set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
	    }
	}
    }
  else
    {
      /* The N_SO starting this symtab is the first symbol, so we
	 better not check the symbol before it.  I'm not this can
	 happen, but it doesn't hurt to check for it.  */
      bfd_seek (symfile_bfd, sym_offset, SEEK_CUR);
      processing_gcc_compilation = 0;
    }

  if (symbuf_idx == symbuf_end)
    fill_symbuf (abfd);
  bufp = &symbuf[symbuf_idx];
  if (bufp->n_type != (unsigned char)N_SO)
    error("First symbol in segment of executable not a source symbol");

  max_symnum = sym_size / symbol_size;

  for (symnum = 0;
       symnum < max_symnum;
       symnum++)
    {
      QUIT;			/* Allow this to be interruptable */
      if (symbuf_idx == symbuf_end)
	fill_symbuf(abfd);
      bufp = &symbuf[symbuf_idx++];
      SWAP_SYMBOL (bufp, abfd);

      type = bufp->n_type;

      SET_NAMESTRING ();

      if (type & N_STAB) {
	  process_one_symbol (type, bufp->n_desc, bufp->n_value,
			      namestring, section_offsets, objfile);
      }
      /* We skip checking for a new .o or -l file; that should never
         happen in this routine. */
      else if (type == N_TEXT)
	{
	  /* I don't think this code will ever be executed, because
	     the GCC_COMPILED_FLAG_SYMBOL usually is right before
	     the N_SO symbol which starts this source file.
	     However, there is no reason not to accept
	     the GCC_COMPILED_FLAG_SYMBOL anywhere.  */

	  if (STREQ (namestring, GCC_COMPILED_FLAG_SYMBOL))
	    processing_gcc_compilation = 1;
	  else if (STREQ (namestring, GCC2_COMPILED_FLAG_SYMBOL))
	    processing_gcc_compilation = 2;

	  if (AUTO_DEMANGLING)
	    {
	      set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
	    }
	}
      else if (type & N_EXT || type == (unsigned char)N_TEXT
	       || type == (unsigned char)N_NBTEXT
	       ) {
	  /* Global symbol: see if we came across a dbx defintion for
	     a corresponding symbol.  If so, store the value.  Remove
	     syms from the chain when their values are stored, but
	     search the whole chain, as there may be several syms from
	     different files with the same name. */
	  /* This is probably not true.  Since the files will be read
	     in one at a time, each reference to a global symbol will
	     be satisfied in each file as it appears. So we skip this
	     section. */
	  ;
        }
    }

  current_objfile = NULL;

  /* In a Solaris elf file, this variable, which comes from the
     value of the N_SO symbol, will still be 0.  Luckily, text_offset,
     which comes from pst->textlow is correct. */
  if (last_source_start_addr == 0)
    last_source_start_addr = text_offset;

  pst->symtab = end_symtab (text_offset + text_size, 0, 0, objfile,
			    SECT_OFF_TEXT);
  end_stabs ();
}


/* This handles a single symbol from the symbol-file, building symbols
   into a GDB symtab.  It takes these arguments and an implicit argument.

   TYPE is the type field of the ".stab" symbol entry.
   DESC is the desc field of the ".stab" entry.
   VALU is the value field of the ".stab" entry.
   NAME is the symbol name, in our address space.
   SECTION_OFFSETS is a set of amounts by which the sections of this object
          file were relocated when it was loaded into memory.
          All symbols that refer
	  to memory locations need to be offset by these amounts.
   OBJFILE is the object file from which we are reading symbols.
 	       It is used in end_symtab.  */

void
process_one_symbol (type, desc, valu, name, section_offsets, objfile)
     int type, desc;
     CORE_ADDR valu;
     char *name;
     struct section_offsets *section_offsets;
     struct objfile *objfile;
{
#ifdef SUN_FIXED_LBRAC_BUG
  /* If SUN_FIXED_LBRAC_BUG is defined, then it tells us whether we need
     to correct the address of N_LBRAC's.  If it is not defined, then
     we never need to correct the addresses.  */

  /* This records the last pc address we've seen.  We depend on there being
     an SLINE or FUN or SO before the first LBRAC, since the variable does
     not get reset in between reads of different symbol files.  */
  static CORE_ADDR last_pc_address;
#endif

  register struct context_stack *new;
  /* This remembers the address of the start of a function.  It is used
     because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries are
     relative to the current function's start address.  On systems
     other than Solaris 2, this just holds the SECT_OFF_TEXT value, and is
     used to relocate these symbol types rather than SECTION_OFFSETS.  */
  static CORE_ADDR function_start_offset;

  /* If this is nonzero, N_LBRAC, N_RBRAC, and N_SLINE entries are relative
     to the function start address.  */
  int block_address_function_relative;

  /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this source
     file.  Used to detect the SunPRO solaris compiler.  */
  int n_opt_found;

  /* The stab type used for the definition of the last function.
     N_STSYM or N_GSYM for SunOS4 acc; N_FUN for other compilers.  */
  static int function_stab_type = 0;

  /* This is true for Solaris (and all other stabs-in-elf systems, hopefully,
     since it would be silly to do things differently from Solaris), and
     false for SunOS4 and other a.out file formats.  */
  block_address_function_relative =
    0 == strncmp (bfd_get_target (objfile->obfd), "elf", 3);

  if (!block_address_function_relative)
    /* N_LBRAC, N_RBRAC and N_SLINE entries are not relative to the
       function start address, so just use the text offset.  */
    function_start_offset = ANOFFSET (section_offsets, SECT_OFF_TEXT);

  /* Something is wrong if we see real data before
     seeing a source file name.  */

  if (last_source_file == NULL && type != (unsigned char)N_SO)
    {
      /* Ignore any symbols which appear before an N_SO symbol.  Currently
	 no one puts symbols there, but we should deal gracefully with the
	 case.  A complain()t might be in order (if !IGNORE_SYMBOL (type)),
	 but this should not be an error ().  */
      return;
    }

  switch (type)
    {
    case N_FUN:
    case N_FNAME:
      /* Relocate for dynamic loading */
      valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
      goto define_a_symbol;

    case N_LBRAC:
      /* This "symbol" just indicates the start of an inner lexical
	 context within a function.  */

#if defined(BLOCK_ADDRESS_ABSOLUTE)
      /* Relocate for dynamic loading (?).  */
      valu += function_start_offset;
#else
      if (block_address_function_relative)
	/* Relocate for Sun ELF acc fn-relative syms.  */
	valu += function_start_offset;
      else
	/* On most machines, the block addresses are relative to the
	   N_SO, the linker did not relocate them (sigh).  */
	valu += last_source_start_addr;
#endif

#ifdef SUN_FIXED_LBRAC_BUG
      if (!SUN_FIXED_LBRAC_BUG && valu < last_pc_address) {
	/* Patch current LBRAC pc value to match last handy pc value */
 	complain (&lbrac_complaint);
	valu = last_pc_address;
      }
#endif
      new = push_context (desc, valu);
      break;

    case N_RBRAC:
      /* This "symbol" just indicates the end of an inner lexical
	 context that was started with N_LBRAC.  */

#if defined(BLOCK_ADDRESS_ABSOLUTE)
      /* Relocate for dynamic loading (?).  */
      valu += function_start_offset;
#else
      if (block_address_function_relative)
	/* Relocate for Sun ELF acc fn-relative syms.  */
	valu += function_start_offset;
      else
	/* On most machines, the block addresses are relative to the
	   N_SO, the linker did not relocate them (sigh).  */
	valu += last_source_start_addr;
#endif

      new = pop_context();
      if (desc != new->depth)
	complain (&lbrac_mismatch_complaint, symnum);

      /* Some compilers put the variable decls inside of an
         LBRAC/RBRAC block.  This macro should be nonzero if this
	 is true.  DESC is N_DESC from the N_RBRAC symbol.
	 GCC_P is true if we've detected the GCC_COMPILED_SYMBOL
	 or the GCC2_COMPILED_SYMBOL.  */
#if !defined (VARIABLES_INSIDE_BLOCK)
#define VARIABLES_INSIDE_BLOCK(desc, gcc_p) 0
#endif

      /* Can only use new->locals as local symbols here if we're in
         gcc or on a machine that puts them before the lbrack.  */
      if (!VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation))
	local_symbols = new->locals;

      /* If this is not the outermost LBRAC...RBRAC pair in the
	 function, its local symbols preceded it, and are the ones
	 just recovered from the context stack.  Defined the block for them.

	 If this is the outermost LBRAC...RBRAC pair, there is no
	 need to do anything; leave the symbols that preceded it
	 to be attached to the function's own block.  However, if
	 it is so, we need to indicate that we just moved outside
	 of the function.  */
      if (local_symbols
	  && (context_stack_depth
	      > !VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation)))
	{
	  /* FIXME Muzzle a compiler bug that makes end < start.  */
	  if (new->start_addr > valu)
	    {
	      complain (&lbrac_rbrac_complaint);
	      new->start_addr = valu;
	    }
	  /* Make a block for the local symbols within.  */
	  finish_block (0, &local_symbols, new->old_blocks,
			new->start_addr, valu, objfile);
	}
      else
	{
	  within_function = 0;
	}
      if (VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation))
	/* Now pop locals of block just finished.  */
	local_symbols = new->locals;
      break;

    case N_FN:
    case N_FN_SEQ:
      /* This kind of symbol indicates the start of an object file.  */
      /* Relocate for dynamic loading */
      valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
      break;

    case N_SO:
      /* This type of symbol indicates the start of data
	 for one source file.
	 Finish the symbol table of the previous source file
	 (if any) and start accumulating a new symbol table.  */
      /* Relocate for dynamic loading */
      valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);

      n_opt_found = 0;

#ifdef SUN_FIXED_LBRAC_BUG
      last_pc_address = valu;	/* Save for SunOS bug circumcision */
#endif

#ifdef PCC_SOL_BROKEN
      /* pcc bug, occasionally puts out SO for SOL.  */
      if (context_stack_depth > 0)
	{
	  start_subfile (name, NULL);
	  break;
	}
#endif
      if (last_source_file)
	{
	  /* Check if previous symbol was also an N_SO (with some
	     sanity checks).  If so, that one was actually the directory
	     name, and the current one is the real file name.
	     Patch things up. */	   
	  if (previous_stab_code == (unsigned char) N_SO)
	    {
	      patch_subfile_names (current_subfile, name);
	      break;		/* Ignore repeated SOs */
	    }
	  end_symtab (valu, 0, 0, objfile, SECT_OFF_TEXT);
	  end_stabs ();
	}
      start_stabs ();
      start_symtab (name, NULL, valu);
      break;


    case N_SOL:
      /* This type of symbol indicates the start of data for
	 a sub-source-file, one whose contents were copied or
	 included in the compilation of the main source file
	 (whose name was given in the N_SO symbol.)  */
      /* Relocate for dynamic loading */
      valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
      start_subfile (name, current_subfile->dirname);
      break;

    case N_BINCL:
      push_subfile ();
      add_new_header_file (name, valu);
      start_subfile (name, current_subfile->dirname);
      break;

    case N_EINCL:
      start_subfile (pop_subfile (), current_subfile->dirname);
      break;

    case N_EXCL:
      add_old_header_file (name, valu);
      break;

    case N_SLINE:
      /* This type of "symbol" really just records
	 one line-number -- core-address correspondence.
	 Enter it in the line list for this symbol table.  */
      /* Relocate for dynamic loading and for ELF acc fn-relative syms.  */
      valu += function_start_offset;
#ifdef SUN_FIXED_LBRAC_BUG
      last_pc_address = valu;	/* Save for SunOS bug circumcision */
#endif
      record_line (current_subfile, desc, valu);
      break;

    case N_BCOMM:
      if (common_block)
	{
	  static struct complaint msg = {
	    "Invalid symbol data: common within common at symtab pos %d",
	    0, 0};
	  complain (&msg, symnum);
	}
      common_block = local_symbols;
      common_block_i = local_symbols ? local_symbols->nsyms : 0;
      break;

    case N_ECOMM:
      /* Symbols declared since the BCOMM are to have the common block
	 start address added in when we know it.  common_block points to
	 the first symbol after the BCOMM in the local_symbols list;
	 copy the list and hang it off the symbol for the common block name
	 for later fixup.  */
      {
	int i;
	struct symbol *sym =
	  (struct symbol *) xmmalloc (objfile -> md, sizeof (struct symbol));
	memset (sym, 0, sizeof *sym);
	SYMBOL_NAME (sym) = savestring (name, strlen (name));
	SYMBOL_CLASS (sym) = LOC_BLOCK;
	SYMBOL_NAMESPACE (sym) = (enum namespace)((long)
	  copy_pending (local_symbols, common_block_i, common_block));
	i = hashname (SYMBOL_NAME (sym));
	SYMBOL_VALUE_CHAIN (sym) = global_sym_chain[i];
	global_sym_chain[i] = sym;
	common_block = 0;
	break;
      }

    /* The following symbol types need to have the appropriate offset added
       to their value; then we process symbol definitions in the name.  */

    case N_STSYM:		/* Static symbol in data seg */
    case N_LCSYM:		/* Static symbol in BSS seg */
    case N_ROSYM:		/* Static symbol in Read-only data seg */
     /* HORRID HACK DEPT.  However, it's Sun's furgin' fault.  FIXME.
	Solaris2's stabs-in-coff makes *most* symbols relative
	but leaves a few absolute.  N_STSYM and friends sit on the fence.
	.stab "foo:S...",N_STSYM 	is absolute (ld relocates it)
	.stab "foo:V...",N_STSYM	is relative (section base subtracted).
	This leaves us no choice but to search for the 'S' or 'V'...
	(or pass the whole section_offsets stuff down ONE MORE function
	call level, which we really don't want to do).  */
      {
	char *p;
	p = strchr (name, ':');
	if (p != 0 && p[1] == 'S')
	  {
	    /* FIXME!  We relocate it by the TEXT offset, in case the
	       whole module moved in memory.  But this is wrong, since
	       the sections can side around independently.  */
	    valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
	    goto define_a_symbol;
	  }
	/* Since it's not the kludge case, re-dispatch to the right handler. */
	switch (type) {
	case N_STSYM: 	goto case_N_STSYM;
	case N_LCSYM:	goto case_N_LCSYM;
	case N_ROSYM:	goto case_N_ROSYM;
	default:	abort();
	}
      }

    case_N_STSYM:		/* Static symbol in data seg */
    case N_DSLINE:		/* Source line number, data seg */
      valu += ANOFFSET (section_offsets, SECT_OFF_DATA);
      goto define_a_symbol;

    case_N_LCSYM:		/* Static symbol in BSS seg */
    case N_BSLINE:		/* Source line number, bss seg */
    /*   N_BROWS:	overlaps with N_BSLINE */
      valu += ANOFFSET (section_offsets, SECT_OFF_BSS);
      goto define_a_symbol;

    case_N_ROSYM:		/* Static symbol in Read-only data seg */
      valu += ANOFFSET (section_offsets, SECT_OFF_RODATA);
      goto define_a_symbol;

    case N_ENTRY:		/* Alternate entry point */
      /* Relocate for dynamic loading */
      valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
      goto define_a_symbol;

    /* The following symbol types we don't know how to process.  Handle
       them in a "default" way, but complain to people who care.  */
    default:
    case N_CATCH:		/* Exception handler catcher */
    case N_EHDECL:		/* Exception handler name */
    case N_PC:			/* Global symbol in Pascal */
    case N_M2C:			/* Modula-2 compilation unit */
    /*   N_MOD2:	overlaps with N_EHDECL */
    case N_SCOPE:		/* Modula-2 scope information */
    case N_ECOML:		/* End common (local name) */
    case N_NBTEXT:		/* Gould Non-Base-Register symbols??? */
    case N_NBDATA:
    case N_NBBSS:
    case N_NBSTS:
    case N_NBLCS:
      complain (&unknown_symtype_complaint, local_hex_string(type));
      /* FALLTHROUGH */

    /* The following symbol types don't need the address field relocated,
       since it is either unused, or is absolute.  */
    define_a_symbol:
    case N_GSYM:		/* Global variable */
    case N_NSYMS:		/* Number of symbols (ultrix) */
    case N_NOMAP:		/* No map?  (ultrix) */
    case N_RSYM:		/* Register variable */
    case N_DEFD:		/* Modula-2 GNU module dependency */
    case N_SSYM:		/* Struct or union element */
    case N_LSYM:		/* Local symbol in stack */
    case N_PSYM:		/* Parameter variable */
    case N_LENG:		/* Length of preceding symbol type */
      if (name)
	{
	  int deftype;
	  char *colon_pos = strchr (name, ':');
	  if (colon_pos == NULL)
	    deftype = '\0';
	  else
	    deftype = colon_pos[1];

	  switch (deftype)
	    {
	    case 'f':
	    case 'F':
	      function_stab_type = type;

#ifdef SUN_FIXED_LBRAC_BUG
	      /* The Sun acc compiler, under SunOS4, puts out
		 functions with N_GSYM or N_STSYM.  The problem is
		 that the address of the symbol is no good (for N_GSYM
		 it doesn't even attept an address; for N_STSYM it
		 puts out an address but then it gets relocated
		 relative to the data segment, not the text segment).
		 Currently we can't fix this up later as we do for
		 some types of symbol in scan_file_globals.
		 Fortunately we do have a way of finding the address -
		 we know that the value in last_pc_address is either
		 the one we want (if we're dealing with the first
		 function in an object file), or somewhere in the
		 previous function. This means that we can use the
		 minimal symbol table to get the address.  */

	      if (type == N_GSYM || type == N_STSYM)
		{
		  struct minimal_symbol *m;
		  int l = colon_pos - name;

		  m = lookup_minimal_symbol_by_pc (last_pc_address);
		  if (m && STREQN (SYMBOL_NAME (m), name, l))
		    /* last_pc_address was in this function */
		    valu = SYMBOL_VALUE (m);
		  else if (m && STREQN (SYMBOL_NAME (m+1), name, l))
		    /* last_pc_address was in last function */
		    valu = SYMBOL_VALUE (m+1);
		  else
		    /* Not found - use last_pc_address (for finish_block) */
		    valu = last_pc_address;
		}

	      last_pc_address = valu;	/* Save for SunOS bug circumcision */
#endif

	      if (block_address_function_relative)
		/* For Solaris 2.0 compilers, the block addresses and
		   N_SLINE's are relative to the start of the
		   function.  On normal systems, and when using gcc on
		   Solaris 2.0, these addresses are just absolute, or
		   relative to the N_SO, depending on
		   BLOCK_ADDRESS_ABSOLUTE.  */
		function_start_offset = valu;	

	      within_function = 1;
	      if (context_stack_depth > 0)
		{
		  new = pop_context ();
		  /* Make a block for the local symbols within.  */
		  finish_block (new->name, &local_symbols, new->old_blocks,
				new->start_addr, valu, objfile);
		}
	      /* Stack must be empty now.  */
	      if (context_stack_depth != 0)
		complain (&lbrac_unmatched_complaint, symnum);

	      new = push_context (0, valu);
	      new->name = define_symbol (valu, name, desc, type, objfile);
	      break;

	    default:
	      define_symbol (valu, name, desc, type, objfile);
	      break;
	    }
	}
      break;

    /* We use N_OPT to carry the gcc2_compiled flag.  Sun uses it
       for a bunch of other flags, too.  Someday we may parse their
       flags; for now we ignore theirs and hope they'll ignore ours.  */
    case N_OPT:			/* Solaris 2:  Compiler options */
      if (name)
	{
	  if (STREQ (name, GCC2_COMPILED_FLAG_SYMBOL))
	    {
	      processing_gcc_compilation = 2;
#if 1	      /* Works, but is experimental.  -fnf */
	      if (AUTO_DEMANGLING)
		{
		  set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
		}
#endif
	    }
	  else
	    n_opt_found = 1;
	}
      break;

    /* The following symbol types can be ignored.  */
    case N_OBJ:			/* Solaris 2:  Object file dir and name */
    /*   N_UNDF: 		   Solaris 2:  file separator mark */
    /*   N_UNDF: -- we will never encounter it, since we only process one
		    file's symbols at once.  */
    case N_ENDM:		/* Solaris 2:  End of module */
    case N_MAIN:		/* Name of main routine.  */
      break;
    }

  previous_stab_code = type;
}

/* Copy a pending list, used to record the contents of a common
   block for later fixup.  We copy the symbols starting with all
   symbols in BEG, and ending with the symbols which are in 
   END at index ENDI.  */
static struct pending *
copy_pending (beg, endi, end)
    struct pending *beg;
    int endi;
    struct pending *end;
{
  struct pending *new = 0;
  struct pending *next;
  int j;

  /* Copy all the struct pendings before end.  */
  for (next = beg; next != NULL && next != end; next = next->next)
    {
      for (j = 0; j < next->nsyms; j++)
	add_symbol_to_list (next->symbol[j], &new);
    }

  /* Copy however much of END we need.  */
  for (j = endi; j < end->nsyms; j++)
    add_symbol_to_list (end->symbol[j], &new);

  return new;
}

/* Scan and build partial symbols for an ELF symbol file.
   This ELF file has already been processed to get its minimal symbols,
   and any DWARF symbols that were in it.

   This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
   rolled into one.

   OBJFILE is the object file we are reading symbols from.
   ADDR is the address relative to which the symbols are (e.g.
   the base address of the text segment).
   MAINLINE is true if we are reading the main symbol
   table (as opposed to a shared lib or dynamically loaded file).
   STABOFFSET and STABSIZE define the location in OBJFILE where the .stab
   section exists.
   STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
   .stabstr section exists.

   This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
   adjusted for elf details. */

void
elfstab_build_psymtabs (objfile, section_offsets, mainline, 
			       staboffset, stabsize,
			       stabstroffset, stabstrsize)
      struct objfile *objfile;
      struct section_offsets *section_offsets;
      int mainline;
      file_ptr staboffset;
      unsigned int stabsize;
      file_ptr stabstroffset;
      unsigned int stabstrsize;
{
  int val;
  bfd *sym_bfd = objfile->obfd;
  char *name = bfd_get_filename (sym_bfd);
  struct dbx_symfile_info *info;

  /* There is already a dbx_symfile_info allocated by our caller.
     It might even contain some info from the ELF symtab to help us.  */
  info = (struct dbx_symfile_info *) objfile->sym_private;

  DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
  if (!DBX_TEXT_SECT (objfile))
    error ("Can't find .text section in symbol file");

#define	ELF_STABS_SYMBOL_SIZE	12	/* XXX FIXME XXX */
  DBX_SYMBOL_SIZE    (objfile) = ELF_STABS_SYMBOL_SIZE;
  DBX_SYMCOUNT       (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile);
  DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
  DBX_SYMTAB_OFFSET  (objfile) = staboffset;
  
  if (stabstrsize < 0	/* FIXME:  stabstrsize is unsigned; never true! */
      || stabstrsize > bfd_get_size (sym_bfd))
    error ("ridiculous string table size: %d bytes", stabstrsize);
  DBX_STRINGTAB (objfile) = (char *)
    obstack_alloc (&objfile->psymbol_obstack, stabstrsize+1);

  /* Now read in the string table in one big gulp.  */

  val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
  if (val < 0)
    perror_with_name (name);
  val = bfd_read (DBX_STRINGTAB (objfile), stabstrsize, 1, sym_bfd);
  if (val != stabstrsize)
    perror_with_name (name);

  stabsread_new_init ();
  buildsym_new_init ();
  free_header_files ();
  init_header_files ();
  install_minimal_symbols (objfile);

  processing_acc_compilation = 1;

  /* In an elf file, we've already installed the minimal symbols that came
     from the elf (non-stab) symbol table, so always act like an
     incremental load here. */
  dbx_symfile_read (objfile, section_offsets, 0);
}

/* Scan and build partial symbols for a PA symbol file.
   This PA file has already been processed to get its minimal symbols.

   OBJFILE is the object file we are reading symbols from.
   ADDR is the address relative to which the symbols are (e.g.
   the base address of the text segment).
   MAINLINE is true if we are reading the main symbol
   table (as opposed to a shared lib or dynamically loaded file).

   */

void
pastab_build_psymtabs (objfile, section_offsets, mainline)
     struct objfile *objfile;
     struct section_offsets *section_offsets;
     int mainline;
{
  free_header_files ();
  init_header_files ();

  /* In a PA file, we've already installed the minimal symbols that came
     from the PA (non-stab) symbol table, so always act like an
     incremental load here. */

  dbx_symfile_read (objfile, section_offsets, mainline);
}

/* Parse the user's idea of an offset for dynamic linking, into our idea
   of how to represent it for fast symbol reading.  */

static struct section_offsets *
dbx_symfile_offsets (objfile, addr)
     struct objfile *objfile;
     CORE_ADDR addr;
{
  struct section_offsets *section_offsets;
  int i;
 
  section_offsets = (struct section_offsets *)
    obstack_alloc (&objfile -> psymbol_obstack,
		   sizeof (struct section_offsets) +
		          sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));

  for (i = 0; i < SECT_OFF_MAX; i++)
    ANOFFSET (section_offsets, i) = addr;
  
  return section_offsets;
}

/* Register our willingness to decode symbols for SunOS and a.out and
   b.out files handled by BFD... */
static struct sym_fns sunos_sym_fns =
{
  "sunOs",		/* sym_name: name or name prefix of BFD target type */
  6,			/* sym_namelen: number of significant sym_name chars */
  dbx_new_init,		/* sym_new_init: init anything gbl to entire symtab */
  dbx_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
  dbx_symfile_read,	/* sym_read: read a symbol file into symtab */
  dbx_symfile_finish,	/* sym_finish: finished with file, cleanup */
  dbx_symfile_offsets,	/* sym_offsets: parse user's offsets to internal form */
  NULL			/* next: pointer to next struct sym_fns */
};

static struct sym_fns aout_sym_fns =
{
  "a.out",		/* sym_name: name or name prefix of BFD target type */
  5,			/* sym_namelen: number of significant sym_name chars */
  dbx_new_init,		/* sym_new_init: init anything gbl to entire symtab */
  dbx_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
  dbx_symfile_read,	/* sym_read: read a symbol file into symtab */
  dbx_symfile_finish,	/* sym_finish: finished with file, cleanup */
  dbx_symfile_offsets,	/* sym_offsets: parse user's offsets to internal form */
  NULL			/* next: pointer to next struct sym_fns */
};

static struct sym_fns bout_sym_fns =
{
  "b.out",		/* sym_name: name or name prefix of BFD target type */
  5,			/* sym_namelen: number of significant sym_name chars */
  dbx_new_init,		/* sym_new_init: init anything gbl to entire symtab */
  dbx_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
  dbx_symfile_read,	/* sym_read: read a symbol file into symtab */
  dbx_symfile_finish,	/* sym_finish: finished with file, cleanup */
  dbx_symfile_offsets,	/* sym_offsets: parse user's offsets to internal form */
  NULL			/* next: pointer to next struct sym_fns */
};

void
_initialize_dbxread ()
{
  add_symtab_fns(&sunos_sym_fns);
  add_symtab_fns(&aout_sym_fns);
  add_symtab_fns(&bout_sym_fns);
}