aboutsummaryrefslogtreecommitdiff
path: root/gdb/stack.c
blob: 68f16b653c3351976ee5dfaabb3b093114bca0a4 (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
/* Print and select stack frames for GDB, the GNU debugger.

   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
   1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 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 <ctype.h>
#include "defs.h"
#include "gdb_string.h"
#include "value.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "language.h"
#include "frame.h"
#include "gdbcmd.h"
#include "gdbcore.h"
#include "target.h"
#include "breakpoint.h"
#include "demangle.h"
#include "inferior.h"
#include "annotate.h"
#include "ui-out.h"

/* Prototypes for exported functions. */

void args_info (char *, int);

void locals_info (char *, int);

void (*selected_frame_level_changed_hook) (int);

void _initialize_stack (void);

/* Prototypes for local functions. */

static void return_command (char *, int);

static void down_command (char *, int);

static void down_silently_base (char *);

static void down_silently_command (char *, int);

static void up_command (char *, int);

static void up_silently_base (char *);

static void up_silently_command (char *, int);

void frame_command (char *, int);

static void current_frame_command (char *, int);

static void select_frame_command (char *, int);

static void print_frame_arg_vars (struct frame_info *, struct ui_file *);

static void catch_info (char *, int);

static void args_plus_locals_info (char *, int);

static void print_frame_label_vars (struct frame_info *, int,
				    struct ui_file *);

static void print_frame_local_vars (struct frame_info *, int,
				    struct ui_file *);

static int print_block_frame_labels (struct block *, int *,
				     struct ui_file *);

static int print_block_frame_locals (struct block *,
				     struct frame_info *,
				     int,
				     struct ui_file *);

static void print_frame (struct frame_info *fi, 
			 int level, 
			 int source, 
			 int args, 
			 struct symtab_and_line sal);

static void print_frame_info_base (struct frame_info *, int, int, int);

static void print_stack_frame_base (struct frame_info *, int, int);

static void backtrace_command (char *, int);

struct frame_info *parse_frame_specification (char *);

static void frame_info (char *, int);

extern int addressprint;	/* Print addresses, or stay symbolic only? */
extern int lines_to_list;	/* # of lines "list" command shows by default */

/* The "selected" stack frame is used by default for local and arg access.
   May be zero, for no selected frame.  */

struct frame_info *selected_frame;

/* Level of the selected frame:
   0 for innermost, 1 for its caller, ...
   or -1 for frame specified by address with no defined level.  */

int selected_frame_level;

/* Zero means do things normally; we are interacting directly with the
   user.  One means print the full filename and linenumber when a
   frame is printed, and do so in a format emacs18/emacs19.22 can
   parse.  Two means print similar annotations, but in many more
   cases and in a slightly different syntax.  */

int annotation_level = 0;


struct print_stack_frame_args
  {
    struct frame_info *fi;
    int level;
    int source;
    int args;
  };

static int print_stack_frame_base_stub (char *);

/* Show and print the frame arguments.
   Pass the args the way catch_errors wants them.  */
static int show_and_print_stack_frame_stub (void *args);
static int
show_and_print_stack_frame_stub (void *args)
{
  struct print_stack_frame_args *p = (struct print_stack_frame_args *) args;

  print_frame_info (p->fi, p->level, p->source, p->args);

  return 0;
}

/* Show or print the frame arguments.
   Pass the args the way catch_errors wants them.  */
static int print_stack_frame_stub (void *args);
static int
print_stack_frame_stub (void *args)
{
  struct print_stack_frame_args *p = (struct print_stack_frame_args *) args;

  print_frame_info_base (p->fi, p->level, p->source, p->args);
  return 0;
}

/* Print a stack frame briefly.  FRAME_INFI should be the frame info
   and LEVEL should be its level in the stack (or -1 for level not
   defined). */

/* Pass the args the way catch_errors wants them.  */
static int
print_stack_frame_base_stub (char *args)
{
  struct print_stack_frame_args *p = (struct print_stack_frame_args *) args;

  print_frame_info_base (p->fi, p->level, p->source, p->args);
  return 0;
}

/* print the frame arguments to the terminal.  
   Pass the args the way catch_errors wants them.  */
static int print_only_stack_frame_stub (void *);
static int
print_only_stack_frame_stub (void *args)
{
  struct print_stack_frame_args *p = (struct print_stack_frame_args *) args;

  print_frame_info_base (p->fi, p->level, p->source, p->args);
  return 0;
}

/* Print a stack frame briefly.  FRAME_INFI should be the frame info
   and LEVEL should be its level in the stack (or -1 for level not defined).
   This prints the level, the function executing, the arguments,
   and the file name and line number.
   If the pc is not at the beginning of the source line,
   the actual pc is printed at the beginning.

   If SOURCE is 1, print the source line as well.
   If SOURCE is -1, print ONLY the source line.  */

static void
print_stack_frame_base (struct frame_info *fi, int level, int source)
{
  struct print_stack_frame_args args;

  args.fi = fi;
  args.level = level;
  args.source = source;
  args.args = 1;

  catch_errors (print_stack_frame_stub, &args, "", RETURN_MASK_ALL);
}

/* Show and print a stack frame briefly.  FRAME_INFI should be the frame info
   and LEVEL should be its level in the stack (or -1 for level not defined).
   This prints the level, the function executing, the arguments,
   and the file name and line number.
   If the pc is not at the beginning of the source line,
   the actual pc is printed at the beginning.

   If SOURCE is 1, print the source line as well.
   If SOURCE is -1, print ONLY the source line.  */

void
show_and_print_stack_frame (struct frame_info *fi, int level, int source)
{
  struct print_stack_frame_args args;

  args.fi = fi;
  args.level = level;
  args.source = source;
  args.args = 1;

  catch_errors (show_and_print_stack_frame_stub, &args, "", RETURN_MASK_ALL);
}


/* Show or print a stack frame briefly.  FRAME_INFI should be the frame info
   and LEVEL should be its level in the stack (or -1 for level not defined).
   This prints the level, the function executing, the arguments,
   and the file name and line number.
   If the pc is not at the beginning of the source line,
   the actual pc is printed at the beginning.

   If SOURCE is 1, print the source line as well.
   If SOURCE is -1, print ONLY the source line.  */

void
print_stack_frame (struct frame_info *fi, int level, int source)
{
  struct print_stack_frame_args args;

  args.fi = fi;
  args.level = level;
  args.source = source;
  args.args = 1;

  catch_errors (print_stack_frame_stub, (char *) &args, "", RETURN_MASK_ALL);
}

/* Print a stack frame briefly.  FRAME_INFI should be the frame info
   and LEVEL should be its level in the stack (or -1 for level not defined).
   This prints the level, the function executing, the arguments,
   and the file name and line number.
   If the pc is not at the beginning of the source line,
   the actual pc is printed at the beginning.

   If SOURCE is 1, print the source line as well.
   If SOURCE is -1, print ONLY the source line.  */

void
print_only_stack_frame (struct frame_info *fi, int level, int source)
{
  struct print_stack_frame_args args;

  args.fi = fi;
  args.level = level;
  args.source = source;
  args.args = 1;

  catch_errors (print_only_stack_frame_stub, &args, "", RETURN_MASK_ALL);
}

struct print_args_args
{
  struct symbol *func;
  struct frame_info *fi;
  struct ui_file *stream;
};

static int print_args_stub (PTR);

/* Pass the args the way catch_errors wants them.  */

static int
print_args_stub (PTR args)
{
  int numargs;
  struct print_args_args *p = (struct print_args_args *) args;

  numargs = FRAME_NUM_ARGS (p->fi);
  print_frame_args (p->func, p->fi, numargs, p->stream);
  return 0;
}

/* Print information about a frame for frame "fi" at level "level".
   Used in "where" output, also used to emit breakpoint or step
   messages.  
   LEVEL is the level of the frame, or -1 if it is the
   innermost frame but we don't want to print the level.  
   The meaning of the SOURCE argument is: 
   SRC_LINE: Print only source line
   LOCATION: Print only location 
   LOC_AND_SRC: Print location and source line.  */

static void
print_frame_info_base (struct frame_info *fi, int level, int source, int args)
{
  struct symtab_and_line sal;
  int source_print;
  int location_print;

#if 0
  char buf[MAX_REGISTER_RAW_SIZE];
  CORE_ADDR sp;

  /* On the 68k, this spends too much time in m68k_find_saved_regs.  */

  /* Get the value of SP_REGNUM relative to the frame.  */
  get_saved_register (buf, (int *) NULL, (CORE_ADDR *) NULL,
		    FRAME_INFO_ID (fi), SP_REGNUM, (enum lval_type *) NULL);
  sp = extract_address (buf, REGISTER_RAW_SIZE (SP_REGNUM));

  /* This is not a perfect test, because if a function alloca's some
     memory, puts some code there, and then jumps into it, then the test
     will succeed even though there is no call dummy.  Probably best is
     to check for a bp_call_dummy breakpoint.  */
  if (PC_IN_CALL_DUMMY (fi->pc, sp, fi->frame))
#else
  if (frame_in_dummy (fi))
#endif
    {
      annotate_frame_begin (level == -1 ? 0 : level, fi->pc);

      /* Do this regardless of SOURCE because we don't have any source
         to list for this frame.  */
      if (level >= 0)
	printf_filtered ("#%-2d ", level);
      annotate_function_call ();
      printf_filtered ("<function called from gdb>\n");
      annotate_frame_end ();
      return;
    }
  if (fi->signal_handler_caller)
    {
      annotate_frame_begin (level == -1 ? 0 : level, fi->pc);

      /* Do this regardless of SOURCE because we don't have any source
         to list for this frame.  */
      if (level >= 0)
	printf_filtered ("#%-2d ", level);
      annotate_signal_handler_caller ();
      printf_filtered ("<signal handler called>\n");
      annotate_frame_end ();
      return;
    }

  /* If fi is not the innermost frame, that normally means that fi->pc
     points to *after* the call instruction, and we want to get the line
     containing the call, never the next line.  But if the next frame is
     a signal_handler_caller or a dummy frame, then the next frame was
     not entered as the result of a call, and we want to get the line
     containing fi->pc.  */
  sal =
    find_pc_line (fi->pc,
		  fi->next != NULL
		  && !fi->next->signal_handler_caller
		  && !frame_in_dummy (fi->next));

  location_print = (source == LOCATION 
		    || source == LOC_AND_ADDRESS
		    || source == SRC_AND_LOC);

  if (location_print || !sal.symtab)
    print_frame (fi, level, source, args, sal);

  source_print = (source == SRC_LINE || source == SRC_AND_LOC);

  if (source_print && sal.symtab)
    {
      int done = 0;
      int mid_statement = (source == SRC_LINE) && (fi->pc != sal.pc);

      if (annotation_level)
	done = identify_source_line (sal.symtab, sal.line, mid_statement,
				     fi->pc);
      if (!done)
	{
	  if (print_frame_info_listing_hook)
	    {
	      print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0);
	      current_source_symtab = sal.symtab;
	    }
	  else
	    {
	      /* We used to do this earlier, but that is clearly
		 wrong. This function is used by many different
		 parts of gdb, including normal_stop in infrun.c,
		 which uses this to print out the current PC
		 when we stepi/nexti into the middle of a source
		 line. Only the command line really wants this
		 behavior. Other UIs probably would like the
		 ability to decide for themselves if it is desired. */
	      if (addressprint && mid_statement)
		{
		  ui_out_field_core_addr (uiout, "addr", fi->pc);
		  ui_out_text (uiout, "\t");
		}

	      print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
	    }
	}
      current_source_line = max (sal.line - lines_to_list / 2, 1);
    }

  if (source != 0)
    set_default_breakpoint (1, fi->pc, sal.symtab, sal.line);

  annotate_frame_end ();

  gdb_flush (gdb_stdout);
}

static void
print_frame (struct frame_info *fi, 
	     int level, 
	     int source, 
	     int args, 
	     struct symtab_and_line sal)
{
  struct symbol *func;
  register char *funname = 0;
  enum language funlang = language_unknown;
  struct ui_stream *stb;
  struct cleanup *old_chain;
  struct cleanup *list_chain;

  stb = ui_out_stream_new (uiout);
  old_chain = make_cleanup_ui_out_stream_delete (stb);

  func = find_pc_function (fi->pc);
  if (func)
    {
      /* In certain pathological cases, the symtabs give the wrong
         function (when we are in the first function in a file which
         is compiled without debugging symbols, the previous function
         is compiled with debugging symbols, and the "foo.o" symbol
         that is supposed to tell us where the file with debugging symbols
         ends has been truncated by ar because it is longer than 15
         characters).  This also occurs if the user uses asm() to create
         a function but not stabs for it (in a file compiled -g).

         So look in the minimal symbol tables as well, and if it comes
         up with a larger address for the function use that instead.
         I don't think this can ever cause any problems; there shouldn't
         be any minimal symbols in the middle of a function; if this is
         ever changed many parts of GDB will need to be changed (and we'll
         create a find_pc_minimal_function or some such).  */

      struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
      if (msymbol != NULL
	  && (SYMBOL_VALUE_ADDRESS (msymbol)
	      > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
	{
#if 0
	  /* There is no particular reason to think the line number
	     information is wrong.  Someone might have just put in
	     a label with asm() but left the line numbers alone.  */
	  /* In this case we have no way of knowing the source file
	     and line number, so don't print them.  */
	  sal.symtab = 0;
#endif
	  /* We also don't know anything about the function besides
	     its address and name.  */
	  func = 0;
	  funname = SYMBOL_NAME (msymbol);
	  funlang = SYMBOL_LANGUAGE (msymbol);
	}
      else
	{
	  /* I'd like to use SYMBOL_SOURCE_NAME() here, to display the
	     demangled name that we already have stored in the symbol
	     table, but we stored a version with DMGL_PARAMS turned
	     on, and here we don't want to display parameters. So call
	     the demangler again, with DMGL_ANSI only. (Yes, I know
	     that printf_symbol_filtered() will again try to demangle
	     the name on the fly, but the issue is that if
	     cplus_demangle() fails here, it'll fail there too. So we
	     want to catch the failure ("demangled==NULL" case below)
	     here, while we still have our hands on the function
	     symbol.) */
	  char *demangled;
	  funname = SYMBOL_NAME (func);
	  funlang = SYMBOL_LANGUAGE (func);
	  if (funlang == language_cplus)
	    {
	      demangled = cplus_demangle (funname, DMGL_ANSI);
	      if (demangled == NULL)
		/* If the demangler fails, try the demangled name from
		   the symbol table. This'll have parameters, but
		   that's preferable to diplaying a mangled name. */
		funname = SYMBOL_SOURCE_NAME (func);
	    }
	}
    }
  else
    {
      struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
      if (msymbol != NULL)
	{
	  funname = SYMBOL_NAME (msymbol);
	  funlang = SYMBOL_LANGUAGE (msymbol);
	}
    }

  annotate_frame_begin (level == -1 ? 0 : level, fi->pc);

  list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");

  if (level >= 0)
    {
      ui_out_text (uiout, "#");
      ui_out_field_fmt (uiout, "level", "%-2d", level);
      ui_out_spaces (uiout, 1);
    }
  if (addressprint)
    if (fi->pc != sal.pc || !sal.symtab || source == LOC_AND_ADDRESS)
      {
	annotate_frame_address ();
	ui_out_field_core_addr (uiout, "addr", fi->pc);
	annotate_frame_address_end ();
	ui_out_text (uiout, " in ");
      }
  annotate_frame_function_name ();
  fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang,
			   DMGL_ANSI);
  ui_out_field_stream (uiout, "func", stb);
  ui_out_wrap_hint (uiout, "   ");
  annotate_frame_args ();
      
  ui_out_text (uiout, " (");
  if (args)
    {
      struct print_args_args args;
      struct cleanup *args_list_chain;
      args.fi = fi;
      args.func = func;
      args.stream = gdb_stdout;
      args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
      catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL);
      /* FIXME: args must be a list. If one argument is a string it will
		 have " that will not be properly escaped.  */
      /* Invoke ui_out_tuple_end.  */
      do_cleanups (args_list_chain);
      QUIT;
    }
  ui_out_text (uiout, ")");
  if (sal.symtab && sal.symtab->filename)
    {
      annotate_frame_source_begin ();
      ui_out_wrap_hint (uiout, "   ");
      ui_out_text (uiout, " at ");
      annotate_frame_source_file ();
      ui_out_field_string (uiout, "file", sal.symtab->filename);
      annotate_frame_source_file_end ();
      ui_out_text (uiout, ":");
      annotate_frame_source_line ();
      ui_out_field_int (uiout, "line", sal.line);
      annotate_frame_source_end ();
    }

#ifdef PC_SOLIB
  if (!funname || (!sal.symtab || !sal.symtab->filename))
    {
      char *lib = PC_SOLIB (fi->pc);
      if (lib)
	{
	  annotate_frame_where ();
	  ui_out_wrap_hint (uiout, "  ");
	  ui_out_text (uiout, " from ");
	  ui_out_field_string (uiout, "from", lib);
	}
    }
#endif /* PC_SOLIB */

  /* do_cleanups will call ui_out_tuple_end() for us.  */
  do_cleanups (list_chain);
  ui_out_text (uiout, "\n");
  do_cleanups (old_chain);
}


/* Show or print the frame info.  If this is the tui, it will be shown in 
   the source display */
void
print_frame_info (struct frame_info *fi, register int level, int source,
		  int args)
{
  print_frame_info_base (fi, level, source, args);
}

/* Show the frame info.  If this is the tui, it will be shown in 
   the source display otherwise, nothing is done */
void
show_stack_frame (struct frame_info *fi)
{
}


/* Read a frame specification in whatever the appropriate format is.
   Call error() if the specification is in any way invalid (i.e.
   this function never returns NULL).  */

struct frame_info *
parse_frame_specification (char *frame_exp)
{
  int numargs = 0;
#define	MAXARGS	4
  CORE_ADDR args[MAXARGS];
  int level;

  if (frame_exp)
    {
      char *addr_string, *p;
      struct cleanup *tmp_cleanup;

      while (*frame_exp == ' ')
	frame_exp++;

      while (*frame_exp)
	{
	  if (numargs > MAXARGS)
	    error ("Too many args in frame specification");
	  /* Parse an argument.  */
	  for (p = frame_exp; *p && *p != ' '; p++)
	    ;
	  addr_string = savestring (frame_exp, p - frame_exp);

	  {
	    struct value *vp;

	    tmp_cleanup = make_cleanup (xfree, addr_string);

	    /* NOTE: we call parse_and_eval and then both
	       value_as_long and value_as_address rather than calling
	       parse_and_eval_long and parse_and_eval_address because
	       of the issue of potential side effects from evaluating
	       the expression.  */
	    vp = parse_and_eval (addr_string);
	    if (numargs == 0)
	      level = value_as_long (vp);

	    args[numargs++] = value_as_address (vp);
	    do_cleanups (tmp_cleanup);
	  }

	  /* Skip spaces, move to possible next arg.  */
	  while (*p == ' ')
	    p++;
	  frame_exp = p;
	}
    }

  switch (numargs)
    {
    case 0:
      if (selected_frame == NULL)
	error ("No selected frame.");
      return selected_frame;
      /* NOTREACHED */
    case 1:
      {
	struct frame_info *fid =
	find_relative_frame (get_current_frame (), &level);
	struct frame_info *tfid;

	if (level == 0)
	  /* find_relative_frame was successful */
	  return fid;

	/* If SETUP_ARBITRARY_FRAME is defined, then frame specifications
	   take at least 2 addresses.  It is important to detect this case
	   here so that "frame 100" does not give a confusing error message
	   like "frame specification requires two addresses".  This of course
	   does not solve the "frame 100" problem for machines on which
	   a frame specification can be made with one address.  To solve
	   that, we need a new syntax for a specifying a frame by address.
	   I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for
	   two args, etc.), but people might think that is too much typing,
	   so I guess *0x23,0x45 would be a possible alternative (commas
	   really should be used instead of spaces to delimit; using spaces
	   normally works in an expression).  */
#ifdef SETUP_ARBITRARY_FRAME
	error ("No frame %d", args[0]);
#endif

	/* If (s)he specifies the frame with an address, he deserves what
	   (s)he gets.  Still, give the highest one that matches.  */

	for (fid = get_current_frame ();
	     fid && fid->frame != args[0];
	     fid = get_prev_frame (fid))
	  ;

	if (fid)
	  while ((tfid = get_prev_frame (fid)) &&
		 (tfid->frame == args[0]))
	    fid = tfid;

	/* We couldn't identify the frame as an existing frame, but
	   perhaps we can create one with a single argument.  */
      }

    default:
#ifdef SETUP_ARBITRARY_FRAME
      return SETUP_ARBITRARY_FRAME (numargs, args);
#else
      /* Usual case.  Do it here rather than have everyone supply
         a SETUP_ARBITRARY_FRAME that does this.  */
      if (numargs == 1)
	return create_new_frame (args[0], 0);
      error ("Too many args in frame specification");
#endif
      /* NOTREACHED */
    }
  /* NOTREACHED */
}

/* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except
   that if it is unsure about the answer, it returns 0
   instead of guessing (this happens on the VAX and i960, for example).

   On most machines, we never have to guess about the args address,
   so FRAME_ARGS_ADDRESS{,_CORRECT} are the same.  */
#if !defined (FRAME_ARGS_ADDRESS_CORRECT)
#define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS
#endif

/* Print verbosely the selected frame or the frame at address ADDR.
   This means absolutely all information in the frame is printed.  */

static void
frame_info (char *addr_exp, int from_tty)
{
  struct frame_info *fi;
  struct symtab_and_line sal;
  struct symbol *func;
  struct symtab *s;
  struct frame_info *calling_frame_info;
  int i, count, numregs;
  char *funname = 0;
  enum language funlang = language_unknown;

  if (!target_has_stack)
    error ("No stack.");

  fi = parse_frame_specification (addr_exp);
  if (fi == NULL)
    error ("Invalid frame specified.");

  sal = find_pc_line (fi->pc,
		      fi->next != NULL
		      && !fi->next->signal_handler_caller
		      && !frame_in_dummy (fi->next));
  func = get_frame_function (fi);
  s = find_pc_symtab (fi->pc);
  if (func)
    {
      /* I'd like to use SYMBOL_SOURCE_NAME() here, to display
       * the demangled name that we already have stored in
       * the symbol table, but we stored a version with
       * DMGL_PARAMS turned on, and here we don't want
       * to display parameters. So call the demangler again,
       * with DMGL_ANSI only. RT
       * (Yes, I know that printf_symbol_filtered() will
       * again try to demangle the name on the fly, but
       * the issue is that if cplus_demangle() fails here,
       * it'll fail there too. So we want to catch the failure
       * ("demangled==NULL" case below) here, while we still
       * have our hands on the function symbol.)
       */
      char *demangled;
      funname = SYMBOL_NAME (func);
      funlang = SYMBOL_LANGUAGE (func);
      if (funlang == language_cplus)
	{
	  demangled = cplus_demangle (funname, DMGL_ANSI);
	  /* If the demangler fails, try the demangled name
	   * from the symbol table. This'll have parameters,
	   * but that's preferable to diplaying a mangled name.
	   */
	  if (demangled == NULL)
	    funname = SYMBOL_SOURCE_NAME (func);
	}
    }
  else
    {
      register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
      if (msymbol != NULL)
	{
	  funname = SYMBOL_NAME (msymbol);
	  funlang = SYMBOL_LANGUAGE (msymbol);
	}
    }
  calling_frame_info = get_prev_frame (fi);

  if (!addr_exp && selected_frame_level >= 0)
    {
      printf_filtered ("Stack level %d, frame at ", selected_frame_level);
      print_address_numeric (fi->frame, 1, gdb_stdout);
      printf_filtered (":\n");
    }
  else
    {
      printf_filtered ("Stack frame at ");
      print_address_numeric (fi->frame, 1, gdb_stdout);
      printf_filtered (":\n");
    }
  printf_filtered (" %s = ", REGISTER_NAME (PC_REGNUM));
  print_address_numeric (fi->pc, 1, gdb_stdout);

  wrap_here ("   ");
  if (funname)
    {
      printf_filtered (" in ");
      fprintf_symbol_filtered (gdb_stdout, funname, funlang,
			       DMGL_ANSI | DMGL_PARAMS);
    }
  wrap_here ("   ");
  if (sal.symtab)
    printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
  puts_filtered ("; ");
  wrap_here ("    ");
  printf_filtered ("saved %s ", REGISTER_NAME (PC_REGNUM));
  print_address_numeric (FRAME_SAVED_PC (fi), 1, gdb_stdout);
  printf_filtered ("\n");

  {
    int frameless;
    frameless = FRAMELESS_FUNCTION_INVOCATION (fi);
    if (frameless)
      printf_filtered (" (FRAMELESS),");
  }

  if (calling_frame_info)
    {
      printf_filtered (" called by frame at ");
      print_address_numeric (calling_frame_info->frame, 1, gdb_stdout);
    }
  if (fi->next && calling_frame_info)
    puts_filtered (",");
  wrap_here ("   ");
  if (fi->next)
    {
      printf_filtered (" caller of frame at ");
      print_address_numeric (fi->next->frame, 1, gdb_stdout);
    }
  if (fi->next || calling_frame_info)
    puts_filtered ("\n");
  if (s)
    printf_filtered (" source language %s.\n", language_str (s->language));

#ifdef PRINT_EXTRA_FRAME_INFO
  PRINT_EXTRA_FRAME_INFO (fi);
#endif

  {
    /* Address of the argument list for this frame, or 0.  */
    CORE_ADDR arg_list = FRAME_ARGS_ADDRESS_CORRECT (fi);
    /* Number of args for this frame, or -1 if unknown.  */
    int numargs;

    if (arg_list == 0)
      printf_filtered (" Arglist at unknown address.\n");
    else
      {
	printf_filtered (" Arglist at ");
	print_address_numeric (arg_list, 1, gdb_stdout);
	printf_filtered (",");

	numargs = FRAME_NUM_ARGS (fi);
	if (numargs < 0)
	  puts_filtered (" args: ");
	else if (numargs == 0)
	  puts_filtered (" no args.");
	else if (numargs == 1)
	  puts_filtered (" 1 arg: ");
	else
	  printf_filtered (" %d args: ", numargs);
	print_frame_args (func, fi, numargs, gdb_stdout);
	puts_filtered ("\n");
      }
  }
  {
    /* Address of the local variables for this frame, or 0.  */
    CORE_ADDR arg_list = FRAME_LOCALS_ADDRESS (fi);

    if (arg_list == 0)
      printf_filtered (" Locals at unknown address,");
    else
      {
	printf_filtered (" Locals at ");
	print_address_numeric (arg_list, 1, gdb_stdout);
	printf_filtered (",");
      }
  }

  FRAME_INIT_SAVED_REGS (fi);
  if (fi->saved_regs != NULL)
    {
      /* The sp is special; what's returned isn't the save address, but
         actually the value of the previous frame's sp.  */
      printf_filtered (" Previous frame's sp is ");
      print_address_numeric (fi->saved_regs[SP_REGNUM], 1, gdb_stdout);
      printf_filtered ("\n");
      count = 0;
      numregs = NUM_REGS + NUM_PSEUDO_REGS;
      for (i = 0; i < numregs; i++)
	if (fi->saved_regs[i] && i != SP_REGNUM)
	  {
	    if (count == 0)
	      puts_filtered (" Saved registers:\n ");
	    else
	      puts_filtered (",");
	    wrap_here (" ");
	    printf_filtered (" %s at ", REGISTER_NAME (i));
	    print_address_numeric (fi->saved_regs[i], 1, gdb_stdout);
	    count++;
	  }
      if (count)
	puts_filtered ("\n");
    }
  else
    {
      /* We could get some information about saved registers by
         calling get_saved_register on each register.  Which info goes
         with which frame is necessarily lost, however, and I suspect
         that the users don't care whether they get the info.  */
      puts_filtered ("\n");
    }
}

#if 0
/* Set a limit on the number of frames printed by default in a
   backtrace.  */

static int backtrace_limit;

static void
set_backtrace_limit_command (char *count_exp, int from_tty)
{
  int count = parse_and_eval_long (count_exp);

  if (count < 0)
    error ("Negative argument not meaningful as backtrace limit.");

  backtrace_limit = count;
}

static void
backtrace_limit_info (char *arg, int from_tty)
{
  if (arg)
    error ("\"Info backtrace-limit\" takes no arguments.");

  printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit);
}
#endif

/* Print briefly all stack frames or just the innermost COUNT frames.  */

static void backtrace_command_1 (char *count_exp, int show_locals,
				 int from_tty);
static void
backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
{
  struct frame_info *fi;
  register int count;
  register int i;
  register struct frame_info *trailing;
  register int trailing_level;

  if (!target_has_stack)
    error ("No stack.");

  /* The following code must do two things.  First, it must
     set the variable TRAILING to the frame from which we should start
     printing.  Second, it must set the variable count to the number
     of frames which we should print, or -1 if all of them.  */
  trailing = get_current_frame ();

  /* The target can be in a state where there is no valid frames
     (e.g., just connected). */
  if (trailing == NULL)
    error ("No stack.");

  trailing_level = 0;
  if (count_exp)
    {
      count = parse_and_eval_long (count_exp);
      if (count < 0)
	{
	  struct frame_info *current;

	  count = -count;

	  current = trailing;
	  while (current && count--)
	    {
	      QUIT;
	      current = get_prev_frame (current);
	    }

	  /* Will stop when CURRENT reaches the top of the stack.  TRAILING
	     will be COUNT below it.  */
	  while (current)
	    {
	      QUIT;
	      trailing = get_prev_frame (trailing);
	      current = get_prev_frame (current);
	      trailing_level++;
	    }

	  count = -1;
	}
    }
  else
    count = -1;

  if (info_verbose)
    {
      struct partial_symtab *ps;

      /* Read in symbols for all of the frames.  Need to do this in
         a separate pass so that "Reading in symbols for xxx" messages
         don't screw up the appearance of the backtrace.  Also
         if people have strong opinions against reading symbols for
         backtrace this may have to be an option.  */
      i = count;
      for (fi = trailing;
	   fi != NULL && i--;
	   fi = get_prev_frame (fi))
	{
	  QUIT;
	  ps = find_pc_psymtab (fi->pc);
	  if (ps)
	    PSYMTAB_TO_SYMTAB (ps);	/* Force syms to come in */
	}
    }

  for (i = 0, fi = trailing;
       fi && count--;
       i++, fi = get_prev_frame (fi))
    {
      QUIT;

      /* Don't use print_stack_frame; if an error() occurs it probably
         means further attempts to backtrace would fail (on the other
         hand, perhaps the code does or could be fixed to make sure
         the frame->prev field gets set to NULL in that case).  */
      print_frame_info_base (fi, trailing_level + i, 0, 1);
      if (show_locals)
	print_frame_local_vars (fi, 1, gdb_stdout);
    }

  /* If we've stopped before the end, mention that.  */
  if (fi && from_tty)
    printf_filtered ("(More stack frames follow...)\n");
}

static void
backtrace_command (char *arg, int from_tty)
{
  struct cleanup *old_chain = (struct cleanup *) NULL;
  char **argv = (char **) NULL;
  int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0;
  char *argPtr = arg;

  if (arg != (char *) NULL)
    {
      int i;

      argv = buildargv (arg);
      old_chain = make_cleanup_freeargv (argv);
      argc = 0;
      for (i = 0; (argv[i] != (char *) NULL); i++)
	{
	  unsigned int j;

	  for (j = 0; (j < strlen (argv[i])); j++)
	    argv[i][j] = tolower (argv[i][j]);

	  if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full"))
	    argIndicatingFullTrace = argc;
	  else
	    {
	      argc++;
	      totArgLen += strlen (argv[i]);
	    }
	}
      totArgLen += argc;
      if (argIndicatingFullTrace >= 0)
	{
	  if (totArgLen > 0)
	    {
	      argPtr = (char *) xmalloc (totArgLen + 1);
	      if (!argPtr)
		nomem (0);
	      else
		{
		  memset (argPtr, 0, totArgLen + 1);
		  for (i = 0; (i < (argc + 1)); i++)
		    {
		      if (i != argIndicatingFullTrace)
			{
			  strcat (argPtr, argv[i]);
			  strcat (argPtr, " ");
			}
		    }
		}
	    }
	  else
	    argPtr = (char *) NULL;
	}
    }

  backtrace_command_1 (argPtr, (argIndicatingFullTrace >= 0), from_tty);

  if (argIndicatingFullTrace >= 0 && totArgLen > 0)
    xfree (argPtr);

  if (old_chain)
    do_cleanups (old_chain);
}

static void backtrace_full_command (char *arg, int from_tty);
static void
backtrace_full_command (char *arg, int from_tty)
{
  backtrace_command_1 (arg, 1, from_tty);
}


/* Print the local variables of a block B active in FRAME.
   Return 1 if any variables were printed; 0 otherwise.  */

static int
print_block_frame_locals (struct block *b, register struct frame_info *fi,
			  int num_tabs, register struct ui_file *stream)
{
  register int i, j;
  register struct symbol *sym;
  register int values_printed = 0;

  ALL_BLOCK_SYMBOLS (b, i, sym)
    {
      switch (SYMBOL_CLASS (sym))
	{
	case LOC_LOCAL:
	case LOC_REGISTER:
	case LOC_STATIC:
	case LOC_BASEREG:
	  values_printed = 1;
	  for (j = 0; j < num_tabs; j++)
	    fputs_filtered ("\t", stream);
	  fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
	  fputs_filtered (" = ", stream);
	  print_variable_value (sym, fi, stream);
	  fprintf_filtered (stream, "\n");
	  break;

	default:
	  /* Ignore symbols which are not locals.  */
	  break;
	}
    }
  return values_printed;
}

/* Same, but print labels.  */

static int
print_block_frame_labels (struct block *b, int *have_default,
			  register struct ui_file *stream)
{
  register int i;
  register struct symbol *sym;
  register int values_printed = 0;

  ALL_BLOCK_SYMBOLS (b, i, sym)
    {
      if (STREQ (SYMBOL_NAME (sym), "default"))
	{
	  if (*have_default)
	    continue;
	  *have_default = 1;
	}
      if (SYMBOL_CLASS (sym) == LOC_LABEL)
	{
	  struct symtab_and_line sal;
	  sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
	  values_printed = 1;
	  fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
	  if (addressprint)
	    {
	      fprintf_filtered (stream, " ");
	      print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
	    }
	  fprintf_filtered (stream, " in file %s, line %d\n",
			    sal.symtab->filename, sal.line);
	}
    }
  return values_printed;
}

/* Print on STREAM all the local variables in frame FRAME,
   including all the blocks active in that frame
   at its current pc.

   Returns 1 if the job was done,
   or 0 if nothing was printed because we have no info
   on the function running in FRAME.  */

static void
print_frame_local_vars (register struct frame_info *fi, register int num_tabs,
			register struct ui_file *stream)
{
  register struct block *block = get_frame_block (fi);
  register int values_printed = 0;

  if (block == 0)
    {
      fprintf_filtered (stream, "No symbol table info available.\n");
      return;
    }

  while (block != 0)
    {
      if (print_block_frame_locals (block, fi, num_tabs, stream))
	values_printed = 1;
      /* After handling the function's top-level block, stop.
         Don't continue to its superblock, the block of
         per-file symbols.  */
      if (BLOCK_FUNCTION (block))
	break;
      block = BLOCK_SUPERBLOCK (block);
    }

  if (!values_printed)
    {
      fprintf_filtered (stream, "No locals.\n");
    }
}

/* Same, but print labels.  */

static void
print_frame_label_vars (register struct frame_info *fi, int this_level_only,
			register struct ui_file *stream)
{
  register struct blockvector *bl;
  register struct block *block = get_frame_block (fi);
  register int values_printed = 0;
  int index, have_default = 0;
  char *blocks_printed;
  CORE_ADDR pc = fi->pc;

  if (block == 0)
    {
      fprintf_filtered (stream, "No symbol table info available.\n");
      return;
    }

  bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
  blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
  memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));

  while (block != 0)
    {
      CORE_ADDR end = BLOCK_END (block) - 4;
      int last_index;

      if (bl != blockvector_for_pc (end, &index))
	error ("blockvector blotch");
      if (BLOCKVECTOR_BLOCK (bl, index) != block)
	error ("blockvector botch");
      last_index = BLOCKVECTOR_NBLOCKS (bl);
      index += 1;

      /* Don't print out blocks that have gone by.  */
      while (index < last_index
	     && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
	index++;

      while (index < last_index
	     && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
	{
	  if (blocks_printed[index] == 0)
	    {
	      if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
		values_printed = 1;
	      blocks_printed[index] = 1;
	    }
	  index++;
	}
      if (have_default)
	return;
      if (values_printed && this_level_only)
	return;

      /* After handling the function's top-level block, stop.
         Don't continue to its superblock, the block of
         per-file symbols.  */
      if (BLOCK_FUNCTION (block))
	break;
      block = BLOCK_SUPERBLOCK (block);
    }

  if (!values_printed && !this_level_only)
    {
      fprintf_filtered (stream, "No catches.\n");
    }
}

/* ARGSUSED */
void
locals_info (char *args, int from_tty)
{
  if (!selected_frame)
    error ("No frame selected.");
  print_frame_local_vars (selected_frame, 0, gdb_stdout);
}

static void
catch_info (char *ignore, int from_tty)
{
  struct symtab_and_line *sal;

  /* Check for target support for exception handling */
  sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
  if (sal)
    {
      /* Currently not handling this */
      /* Ideally, here we should interact with the C++ runtime
         system to find the list of active handlers, etc. */
      fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n");
#if 0
      if (!selected_frame)
	error ("No frame selected.");
#endif
    }
  else
    {
      /* Assume g++ compiled code -- old v 4.16 behaviour */
      if (!selected_frame)
	error ("No frame selected.");

      print_frame_label_vars (selected_frame, 0, gdb_stdout);
    }
}

static void
print_frame_arg_vars (register struct frame_info *fi,
		      register struct ui_file *stream)
{
  struct symbol *func = get_frame_function (fi);
  register struct block *b;
  register int i;
  register struct symbol *sym, *sym2;
  register int values_printed = 0;

  if (func == 0)
    {
      fprintf_filtered (stream, "No symbol table info available.\n");
      return;
    }

  b = SYMBOL_BLOCK_VALUE (func);
  ALL_BLOCK_SYMBOLS (b, i, sym)
    {
      switch (SYMBOL_CLASS (sym))
	{
	case LOC_ARG:
	case LOC_LOCAL_ARG:
	case LOC_REF_ARG:
	case LOC_REGPARM:
	case LOC_REGPARM_ADDR:
	case LOC_BASEREG_ARG:
	  values_printed = 1;
	  fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
	  fputs_filtered (" = ", stream);

	  /* We have to look up the symbol because arguments can have
	     two entries (one a parameter, one a local) and the one we
	     want is the local, which lookup_symbol will find for us.
	     This includes gcc1 (not gcc2) on the sparc when passing a
	     small structure and gcc2 when the argument type is float
	     and it is passed as a double and converted to float by
	     the prologue (in the latter case the type of the LOC_ARG
	     symbol is double and the type of the LOC_LOCAL symbol is
	     float).  There are also LOC_ARG/LOC_REGISTER pairs which
	     are not combined in symbol-reading.  */

	  sym2 = lookup_symbol (SYMBOL_NAME (sym),
		   b, VAR_NAMESPACE, (int *) NULL, (struct symtab **) NULL);
	  print_variable_value (sym2, fi, stream);
	  fprintf_filtered (stream, "\n");
	  break;

	default:
	  /* Don't worry about things which aren't arguments.  */
	  break;
	}
    }
  if (!values_printed)
    {
      fprintf_filtered (stream, "No arguments.\n");
    }
}

void
args_info (char *ignore, int from_tty)
{
  if (!selected_frame)
    error ("No frame selected.");
  print_frame_arg_vars (selected_frame, gdb_stdout);
}


static void
args_plus_locals_info (char *ignore, int from_tty)
{
  args_info (ignore, from_tty);
  locals_info (ignore, from_tty);
}


/* Select frame FI, and note that its stack level is LEVEL.
   LEVEL may be -1 if an actual level number is not known.  */

void
select_frame (struct frame_info *fi, int level)
{
  register struct symtab *s;

  selected_frame = fi;
  selected_frame_level = level;
  if (selected_frame_level_changed_hook)
    selected_frame_level_changed_hook (level);

  /* Ensure that symbols for this frame are read in.  Also, determine the
     source language of this frame, and switch to it if desired.  */
  if (fi)
    {
      s = find_pc_symtab (fi->pc);
      if (s
	  && s->language != current_language->la_language
	  && s->language != language_unknown
	  && language_mode == language_mode_auto)
	{
	  set_language (s->language);
	}
    }
}


/* Select frame FI, noting that its stack level is LEVEL.  Also print
   the stack frame and show the source if this is the tui version.  */
void
select_and_print_frame (struct frame_info *fi, int level)
{
  select_frame (fi, level);
  if (fi)
    {
      print_stack_frame (fi, level, 1);
    }
}


/* Store the selected frame and its level into *FRAMEP and *LEVELP.
   If there is no selected frame, *FRAMEP is set to NULL.  */

void
record_selected_frame (CORE_ADDR *frameaddrp, int *levelp)
{
  *frameaddrp = selected_frame ? selected_frame->frame : 0;
  *levelp = selected_frame_level;
}

/* Return the symbol-block in which the selected frame is executing.
   Can return zero under various legitimate circumstances.  */

struct block *
get_selected_block (void)
{
  if (!target_has_stack)
    return 0;

  if (!selected_frame)
    return get_current_block ();
  return get_frame_block (selected_frame);
}

/* Find a frame a certain number of levels away from FRAME.
   LEVEL_OFFSET_PTR points to an int containing the number of levels.
   Positive means go to earlier frames (up); negative, the reverse.
   The int that contains the number of levels is counted toward
   zero as the frames for those levels are found.
   If the top or bottom frame is reached, that frame is returned,
   but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
   how much farther the original request asked to go.  */

struct frame_info *
find_relative_frame (register struct frame_info *frame,
		     register int *level_offset_ptr)
{
  register struct frame_info *prev;
  register struct frame_info *frame1;

  /* Going up is simple: just do get_prev_frame enough times
     or until initial frame is reached.  */
  while (*level_offset_ptr > 0)
    {
      prev = get_prev_frame (frame);
      if (prev == 0)
	break;
      (*level_offset_ptr)--;
      frame = prev;
    }
  /* Going down is just as simple.  */
  if (*level_offset_ptr < 0)
    {
      while (*level_offset_ptr < 0)
	{
	  frame1 = get_next_frame (frame);
	  if (!frame1)
	    break;
	  frame = frame1;
	  (*level_offset_ptr)++;
	}
    }
  return frame;
}

/* The "select_frame" command.  With no arg, NOP.
   With arg LEVEL_EXP, select the frame at level LEVEL if it is a
   valid level.  Otherwise, treat level_exp as an address expression
   and select it.  See parse_frame_specification for more info on proper
   frame expressions. */

/* ARGSUSED */
void
select_frame_command_wrapper (char *level_exp, int from_tty)
{
  select_frame_command (level_exp, from_tty);
}

static void
select_frame_command (char *level_exp, int from_tty)
{
  register struct frame_info *frame, *frame1;
  unsigned int level = 0;

  if (!target_has_stack)
    error ("No stack.");

  frame = parse_frame_specification (level_exp);

  /* Try to figure out what level this frame is.  But if there is
     no current stack, don't error out -- let the user set one.  */
  frame1 = 0;
  if (get_current_frame ())
    {
      for (frame1 = get_prev_frame (0);
	   frame1 && frame1 != frame;
	   frame1 = get_prev_frame (frame1))
	level++;
    }

  if (!frame1)
    level = 0;

  select_frame (frame, level);
}

/* The "frame" command.  With no arg, print selected frame briefly.
   With arg, behaves like select_frame and then prints the selected
   frame.  */

void
frame_command (char *level_exp, int from_tty)
{
  select_frame_command (level_exp, from_tty);
  show_and_print_stack_frame (selected_frame, selected_frame_level, 1);
}

/* The XDB Compatibility command to print the current frame. */

static void
current_frame_command (char *level_exp, int from_tty)
{
  if (target_has_stack == 0 || selected_frame == 0)
    error ("No stack.");
  print_only_stack_frame (selected_frame, selected_frame_level, 1);
}

/* Select the frame up one or COUNT stack levels
   from the previously selected frame, and print it briefly.  */

/* ARGSUSED */
static void
up_silently_base (char *count_exp)
{
  register struct frame_info *fi;
  int count = 1, count1;
  if (count_exp)
    count = parse_and_eval_long (count_exp);
  count1 = count;

  if (target_has_stack == 0 || selected_frame == 0)
    error ("No stack.");

  fi = find_relative_frame (selected_frame, &count1);
  if (count1 != 0 && count_exp == 0)
    error ("Initial frame selected; you cannot go up.");
  select_frame (fi, selected_frame_level + count - count1);
}

static void
up_silently_command (char *count_exp, int from_tty)
{
  up_silently_base (count_exp);
}

static void
up_command (char *count_exp, int from_tty)
{
  up_silently_base (count_exp);
  show_and_print_stack_frame (selected_frame, selected_frame_level, 1);
}

/* Select the frame down one or COUNT stack levels
   from the previously selected frame, and print it briefly.  */

/* ARGSUSED */
static void
down_silently_base (char *count_exp)
{
  register struct frame_info *frame;
  int count = -1, count1;
  if (count_exp)
    count = -parse_and_eval_long (count_exp);
  count1 = count;

  if (target_has_stack == 0 || selected_frame == 0)
    error ("No stack.");

  frame = find_relative_frame (selected_frame, &count1);
  if (count1 != 0 && count_exp == 0)
    {

      /* We only do this if count_exp is not specified.  That way "down"
         means to really go down (and let me know if that is
         impossible), but "down 9999" can be used to mean go all the way
         down without getting an error.  */

      error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
    }

  select_frame (frame, selected_frame_level + count - count1);
}

/* ARGSUSED */
static void
down_silently_command (char *count_exp, int from_tty)
{
  down_silently_base (count_exp);
}

static void
down_command (char *count_exp, int from_tty)
{
  down_silently_base (count_exp);
  show_and_print_stack_frame (selected_frame, selected_frame_level, 1);
}

void
return_command_wrapper (char *retval_exp, int from_tty)
{
  return_command (retval_exp, from_tty);
}

static void
return_command (char *retval_exp, int from_tty)
{
  struct symbol *thisfun;
  CORE_ADDR selected_frame_addr;
  CORE_ADDR selected_frame_pc;
  struct frame_info *frame;
  struct value *return_value = NULL;

  if (selected_frame == NULL)
    error ("No selected frame.");
  thisfun = get_frame_function (selected_frame);
  selected_frame_addr = FRAME_FP (selected_frame);
  selected_frame_pc = selected_frame->pc;

  /* Compute the return value (if any -- possibly getting errors here).  */

  if (retval_exp)
    {
      struct type *return_type = NULL;

      return_value = parse_and_eval (retval_exp);

      /* Cast return value to the return type of the function.  */
      if (thisfun != NULL)
	return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
      if (return_type == NULL)
	return_type = builtin_type_int;
      return_value = value_cast (return_type, return_value);

      /* Make sure we have fully evaluated it, since
         it might live in the stack frame we're about to pop.  */
      if (VALUE_LAZY (return_value))
	value_fetch_lazy (return_value);
    }

  /* If interactive, require confirmation.  */

  if (from_tty)
    {
      if (thisfun != 0)
	{
	  if (!query ("Make %s return now? ", SYMBOL_SOURCE_NAME (thisfun)))
	    {
	      error ("Not confirmed.");
	      /* NOTREACHED */
	    }
	}
      else if (!query ("Make selected stack frame return now? "))
	error ("Not confirmed.");
    }

  /* Do the real work.  Pop until the specified frame is current.  We
     use this method because the selected_frame is not valid after
     a POP_FRAME.  The pc comparison makes this work even if the
     selected frame shares its fp with another frame.  */

  while (selected_frame_addr != (frame = get_current_frame ())->frame
	 || selected_frame_pc != frame->pc)
    POP_FRAME;

  /* Then pop that frame.  */

  POP_FRAME;

  /* Compute the return value (if any) and store in the place
     for return values.  */

  if (retval_exp)
    set_return_value (return_value);

  /* If we are at the end of a call dummy now, pop the dummy frame too.  */

  if (CALL_DUMMY_HAS_COMPLETED (read_pc(), read_sp (),
				FRAME_FP (get_current_frame ())))
    POP_FRAME;

  /* If interactive, print the frame that is now current.  */

  if (from_tty)
    frame_command ("0", 1);
  else
    select_frame_command ("0", 0);
}

/* Sets the scope to input function name, provided that the
   function is within the current stack frame */

struct function_bounds
{
  CORE_ADDR low, high;
};

static void func_command (char *arg, int from_tty);
static void
func_command (char *arg, int from_tty)
{
  struct frame_info *fp;
  int found = 0;
  struct symtabs_and_lines sals;
  int i;
  int level = 1;
  struct function_bounds *func_bounds = (struct function_bounds *) NULL;

  if (arg != (char *) NULL)
    return;

  fp = parse_frame_specification ("0");
  sals = decode_line_spec (arg, 1);
  func_bounds = (struct function_bounds *) xmalloc (
			      sizeof (struct function_bounds) * sals.nelts);
  for (i = 0; (i < sals.nelts && !found); i++)
    {
      if (sals.sals[i].pc == (CORE_ADDR) 0 ||
	  find_pc_partial_function (sals.sals[i].pc,
				    (char **) NULL,
				    &func_bounds[i].low,
				    &func_bounds[i].high) == 0)
	{
	  func_bounds[i].low =
	    func_bounds[i].high = (CORE_ADDR) NULL;
	}
    }

  do
    {
      for (i = 0; (i < sals.nelts && !found); i++)
	found = (fp->pc >= func_bounds[i].low &&
		 fp->pc < func_bounds[i].high);
      if (!found)
	{
	  level = 1;
	  fp = find_relative_frame (fp, &level);
	}
    }
  while (!found && level == 0);

  if (func_bounds)
    xfree (func_bounds);

  if (!found)
    printf_filtered ("'%s' not within current stack frame.\n", arg);
  else if (fp != selected_frame)
    select_and_print_frame (fp, level);
}

/* Gets the language of the current frame.  */

enum language
get_frame_language (void)
{
  register struct symtab *s;
  enum language flang;		/* The language of the current frame */

  if (selected_frame)
    {
      s = find_pc_symtab (selected_frame->pc);
      if (s)
	flang = s->language;
      else
	flang = language_unknown;
    }
  else
    flang = language_unknown;

  return flang;
}

void
_initialize_stack (void)
{
#if 0
  backtrace_limit = 30;
#endif

  add_com ("return", class_stack, return_command,
	   "Make selected stack frame return to its caller.\n\
Control remains in the debugger, but when you continue\n\
execution will resume in the frame above the one now selected.\n\
If an argument is given, it is an expression for the value to return.");

  add_com ("up", class_stack, up_command,
	   "Select and print stack frame that called this one.\n\
An argument says how many frames up to go.");
  add_com ("up-silently", class_support, up_silently_command,
	   "Same as the `up' command, but does not print anything.\n\
This is useful in command scripts.");

  add_com ("down", class_stack, down_command,
	   "Select and print stack frame called by this one.\n\
An argument says how many frames down to go.");
  add_com_alias ("do", "down", class_stack, 1);
  add_com_alias ("dow", "down", class_stack, 1);
  add_com ("down-silently", class_support, down_silently_command,
	   "Same as the `down' command, but does not print anything.\n\
This is useful in command scripts.");

  add_com ("frame", class_stack, frame_command,
	   "Select and print a stack frame.\n\
With no argument, print the selected stack frame.  (See also \"info frame\").\n\
An argument specifies the frame to select.\n\
It can be a stack frame number or the address of the frame.\n\
With argument, nothing is printed if input is coming from\n\
a command file or a user-defined command.");

  add_com_alias ("f", "frame", class_stack, 1);

  if (xdb_commands)
    {
      add_com ("L", class_stack, current_frame_command,
	       "Print the current stack frame.\n");
      add_com_alias ("V", "frame", class_stack, 1);
    }
  add_com ("select-frame", class_stack, select_frame_command,
	   "Select a stack frame without printing anything.\n\
An argument specifies the frame to select.\n\
It can be a stack frame number or the address of the frame.\n");

  add_com ("backtrace", class_stack, backtrace_command,
	   "Print backtrace of all stack frames, or innermost COUNT frames.\n\
With a negative argument, print outermost -COUNT frames.\n\
Use of the 'full' qualifier also prints the values of the local variables.\n");
  add_com_alias ("bt", "backtrace", class_stack, 0);
  if (xdb_commands)
    {
      add_com_alias ("t", "backtrace", class_stack, 0);
      add_com ("T", class_stack, backtrace_full_command,
	       "Print backtrace of all stack frames, or innermost COUNT frames \n\
and the values of the local variables.\n\
With a negative argument, print outermost -COUNT frames.\n\
Usage: T <count>\n");
    }

  add_com_alias ("where", "backtrace", class_alias, 0);
  add_info ("stack", backtrace_command,
	    "Backtrace of the stack, or innermost COUNT frames.");
  add_info_alias ("s", "stack", 1);
  add_info ("frame", frame_info,
	    "All about selected stack frame, or frame at ADDR.");
  add_info_alias ("f", "frame", 1);
  add_info ("locals", locals_info,
	    "Local variables of current stack frame.");
  add_info ("args", args_info,
	    "Argument variables of current stack frame.");
  if (xdb_commands)
    add_com ("l", class_info, args_plus_locals_info,
	     "Argument and local variables of current stack frame.");

  if (dbx_commands)
    add_com ("func", class_stack, func_command,
      "Select the stack frame that contains <func>.\nUsage: func <name>\n");

  add_info ("catch", catch_info,
	    "Exceptions that can be caught in the current stack frame.");

#if 0
  add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command,
  "Specify maximum number of frames for \"backtrace\" to print by default.",
	   &setlist);
  add_info ("backtrace-limit", backtrace_limit_info,
     "The maximum number of frames for \"backtrace\" to print by default.");
#endif
}