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
|
/* Copyright (C) 1992-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "observable.h"
#include "gdbcmd.h"
#include "target.h"
#include "ada-lang.h"
#include "gdbcore.h"
#include "inferior.h"
#include "gdbthread.h"
#include "progspace.h"
#include "objfiles.h"
#include "cli/cli-style.h"
static int ada_build_task_list ();
/* The name of the array in the GNAT runtime where the Ada Task Control
Block of each task is stored. */
#define KNOWN_TASKS_NAME "system__tasking__debug__known_tasks"
/* The maximum number of tasks known to the Ada runtime. */
static const int MAX_NUMBER_OF_KNOWN_TASKS = 1000;
/* The name of the variable in the GNAT runtime where the head of a task
chain is saved. This is an alternate mechanism to find the list of known
tasks. */
#define KNOWN_TASKS_LIST "system__tasking__debug__first_task"
enum task_states
{
Unactivated,
Runnable,
Terminated,
Activator_Sleep,
Acceptor_Sleep,
Entry_Caller_Sleep,
Async_Select_Sleep,
Delay_Sleep,
Master_Completion_Sleep,
Master_Phase_2_Sleep,
Interrupt_Server_Idle_Sleep,
Interrupt_Server_Blocked_Interrupt_Sleep,
Timer_Server_Sleep,
AST_Server_Sleep,
Asynchronous_Hold,
Interrupt_Server_Blocked_On_Event_Flag,
Activating,
Acceptor_Delay_Sleep
};
/* A short description corresponding to each possible task state. */
static const char * const task_states[] = {
N_("Unactivated"),
N_("Runnable"),
N_("Terminated"),
N_("Child Activation Wait"),
N_("Accept or Select Term"),
N_("Waiting on entry call"),
N_("Async Select Wait"),
N_("Delay Sleep"),
N_("Child Termination Wait"),
N_("Wait Child in Term Alt"),
"",
"",
"",
"",
N_("Asynchronous Hold"),
"",
N_("Activating"),
N_("Selective Wait")
};
/* Return a string representing the task state. */
static const char *
get_state (unsigned value)
{
if (value >= 0
&& value <= ARRAY_SIZE (task_states)
&& task_states[value][0] != '\0')
return _(task_states[value]);
static char buffer[100];
xsnprintf (buffer, sizeof (buffer), _("Unknown task state: %d"), value);
return buffer;
}
/* A longer description corresponding to each possible task state. */
static const char * const long_task_states[] = {
N_("Unactivated"),
N_("Runnable"),
N_("Terminated"),
N_("Waiting for child activation"),
N_("Blocked in accept or select with terminate"),
N_("Waiting on entry call"),
N_("Asynchronous Selective Wait"),
N_("Delay Sleep"),
N_("Waiting for children termination"),
N_("Waiting for children in terminate alternative"),
"",
"",
"",
"",
N_("Asynchronous Hold"),
"",
N_("Activating"),
N_("Blocked in selective wait statement")
};
/* Return a string representing the task state. This uses the long
descriptions. */
static const char *
get_long_state (unsigned value)
{
if (value >= 0
&& value <= ARRAY_SIZE (long_task_states)
&& long_task_states[value][0] != '\0')
return _(long_task_states[value]);
static char buffer[100];
xsnprintf (buffer, sizeof (buffer), _("Unknown task state: %d"), value);
return buffer;
}
/* The index of certain important fields in the Ada Task Control Block
record and sub-records. */
struct atcb_fieldnos
{
/* Fields in record Ada_Task_Control_Block. */
int common;
int entry_calls;
int atc_nesting_level;
/* Fields in record Common_ATCB. */
int state;
int parent;
int priority;
int image;
int image_len; /* This field may be missing. */
int activation_link;
int call;
int ll;
int base_cpu;
/* Fields in Task_Primitives.Private_Data. */
int ll_thread;
int ll_lwp; /* This field may be missing. */
/* Fields in Common_ATCB.Call.all. */
int call_self;
};
/* This module's per-program-space data. */
struct ada_tasks_pspace_data
{
/* Nonzero if the data has been initialized. If set to zero,
it means that the data has either not been initialized, or
has potentially become stale. */
int initialized_p = 0;
/* The ATCB record type. */
struct type *atcb_type = nullptr;
/* The ATCB "Common" component type. */
struct type *atcb_common_type = nullptr;
/* The type of the "ll" field, from the atcb_common_type. */
struct type *atcb_ll_type = nullptr;
/* The type of the "call" field, from the atcb_common_type. */
struct type *atcb_call_type = nullptr;
/* The index of various fields in the ATCB record and sub-records. */
struct atcb_fieldnos atcb_fieldno {};
/* On some systems, gdbserver applies an offset to the CPU that is
reported. */
unsigned int cpu_id_offset = 0;
};
/* Key to our per-program-space data. */
static const registry<program_space>::key<ada_tasks_pspace_data>
ada_tasks_pspace_data_handle;
/* The kind of data structure used by the runtime to store the list
of Ada tasks. */
enum ada_known_tasks_kind
{
/* Use this value when we haven't determined which kind of structure
is being used, or when we need to recompute it.
We set the value of this enumerate to zero on purpose: This allows
us to use this enumerate in a structure where setting all fields
to zero will result in this kind being set to unknown. */
ADA_TASKS_UNKNOWN = 0,
/* This value means that we did not find any task list. Unless
there is a bug somewhere, this means that the inferior does not
use tasking. */
ADA_TASKS_NOT_FOUND,
/* This value means that the task list is stored as an array.
This is the usual method, as it causes very little overhead.
But this method is not always used, as it does use a certain
amount of memory, which might be scarse in certain environments. */
ADA_TASKS_ARRAY,
/* This value means that the task list is stored as a linked list.
This has more runtime overhead than the array approach, but
also require less memory when the number of tasks is small. */
ADA_TASKS_LIST,
};
/* This module's per-inferior data. */
struct ada_tasks_inferior_data
{
/* The type of data structure used by the runtime to store
the list of Ada tasks. The value of this field influences
the interpretation of the known_tasks_addr field below:
- ADA_TASKS_UNKNOWN: The value of known_tasks_addr hasn't
been determined yet;
- ADA_TASKS_NOT_FOUND: The program probably does not use tasking
and the known_tasks_addr is irrelevant;
- ADA_TASKS_ARRAY: The known_tasks is an array;
- ADA_TASKS_LIST: The known_tasks is a list. */
enum ada_known_tasks_kind known_tasks_kind = ADA_TASKS_UNKNOWN;
/* The address of the known_tasks structure. This is where
the runtime stores the information for all Ada tasks.
The interpretation of this field depends on KNOWN_TASKS_KIND
above. */
CORE_ADDR known_tasks_addr = 0;
/* Type of elements of the known task. Usually a pointer. */
struct type *known_tasks_element = nullptr;
/* Number of elements in the known tasks array. */
unsigned int known_tasks_length = 0;
/* When nonzero, this flag indicates that the task_list field
below is up to date. When set to zero, the list has either
not been initialized, or has potentially become stale. */
bool task_list_valid_p = false;
/* The list of Ada tasks.
Note: To each task we associate a number that the user can use to
reference it - this number is printed beside each task in the tasks
info listing displayed by "info tasks". This number is equal to
its index in the vector + 1. Reciprocally, to compute the index
of a task in the vector, we need to substract 1 from its number. */
std::vector<ada_task_info> task_list;
};
/* Key to our per-inferior data. */
static const registry<inferior>::key<ada_tasks_inferior_data>
ada_tasks_inferior_data_handle;
/* Return a string with TASKNO followed by the task name if TASK_INFO
contains a name. */
static std::string
task_to_str (int taskno, const ada_task_info *task_info)
{
if (task_info->name[0] == '\0')
return string_printf ("%d", taskno);
else
return string_printf ("%d \"%s\"", taskno, task_info->name);
}
/* Return the ada-tasks module's data for the given program space (PSPACE).
If none is found, add a zero'ed one now.
This function always returns a valid object. */
static struct ada_tasks_pspace_data *
get_ada_tasks_pspace_data (struct program_space *pspace)
{
struct ada_tasks_pspace_data *data;
data = ada_tasks_pspace_data_handle.get (pspace);
if (data == NULL)
data = ada_tasks_pspace_data_handle.emplace (pspace);
return data;
}
/* Return the ada-tasks module's data for the given inferior (INF).
If none is found, add a zero'ed one now.
This function always returns a valid object.
Note that we could use an observer of the inferior-created event
to make sure that the ada-tasks per-inferior data always exists.
But we preferred this approach, as it avoids this entirely as long
as the user does not use any of the tasking features. This is
quite possible, particularly in the case where the inferior does
not use tasking. */
static struct ada_tasks_inferior_data *
get_ada_tasks_inferior_data (struct inferior *inf)
{
struct ada_tasks_inferior_data *data;
data = ada_tasks_inferior_data_handle.get (inf);
if (data == NULL)
data = ada_tasks_inferior_data_handle.emplace (inf);
return data;
}
/* Return the task number of the task whose thread is THREAD, or zero
if the task could not be found. */
int
ada_get_task_number (thread_info *thread)
{
struct inferior *inf = thread->inf;
struct ada_tasks_inferior_data *data;
gdb_assert (inf != NULL);
data = get_ada_tasks_inferior_data (inf);
for (int i = 0; i < data->task_list.size (); i++)
if (data->task_list[i].ptid == thread->ptid)
return i + 1;
return 0; /* No matching task found. */
}
/* Return the task number of the task running in inferior INF which
matches TASK_ID , or zero if the task could not be found. */
static int
get_task_number_from_id (CORE_ADDR task_id, struct inferior *inf)
{
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
for (int i = 0; i < data->task_list.size (); i++)
{
if (data->task_list[i].task_id == task_id)
return i + 1;
}
/* Task not found. Return 0. */
return 0;
}
/* Return non-zero if TASK_NUM is a valid task number. */
int
valid_task_id (int task_num)
{
struct ada_tasks_inferior_data *data;
ada_build_task_list ();
data = get_ada_tasks_inferior_data (current_inferior ());
return task_num > 0 && task_num <= data->task_list.size ();
}
/* Return non-zero iff the task STATE corresponds to a non-terminated
task state. */
static int
ada_task_is_alive (const struct ada_task_info *task_info)
{
return (task_info->state != Terminated);
}
/* Search through the list of known tasks for the one whose ptid is
PTID, and return it. Return NULL if the task was not found. */
struct ada_task_info *
ada_get_task_info_from_ptid (ptid_t ptid)
{
struct ada_tasks_inferior_data *data;
ada_build_task_list ();
data = get_ada_tasks_inferior_data (current_inferior ());
for (ada_task_info &task : data->task_list)
{
if (task.ptid == ptid)
return &task;
}
return NULL;
}
/* Call the ITERATOR function once for each Ada task that hasn't been
terminated yet. */
void
iterate_over_live_ada_tasks (ada_task_list_iterator_ftype iterator)
{
struct ada_tasks_inferior_data *data;
ada_build_task_list ();
data = get_ada_tasks_inferior_data (current_inferior ());
for (ada_task_info &task : data->task_list)
{
if (!ada_task_is_alive (&task))
continue;
iterator (&task);
}
}
/* Extract the contents of the value as a string whose length is LENGTH,
and store the result in DEST. */
static void
value_as_string (char *dest, struct value *val, int length)
{
memcpy (dest, val->contents ().data (), length);
dest[length] = '\0';
}
/* Extract the string image from the fat string corresponding to VAL,
and store it in DEST. If the string length is greater than MAX_LEN,
then truncate the result to the first MAX_LEN characters of the fat
string. */
static void
read_fat_string_value (char *dest, struct value *val, int max_len)
{
struct value *array_val;
struct value *bounds_val;
int len;
/* The following variables are made static to avoid recomputing them
each time this function is called. */
static int initialize_fieldnos = 1;
static int array_fieldno;
static int bounds_fieldno;
static int upper_bound_fieldno;
/* Get the index of the fields that we will need to read in order
to extract the string from the fat string. */
if (initialize_fieldnos)
{
struct type *type = val->type ();
struct type *bounds_type;
array_fieldno = ada_get_field_index (type, "P_ARRAY", 0);
bounds_fieldno = ada_get_field_index (type, "P_BOUNDS", 0);
bounds_type = type->field (bounds_fieldno).type ();
if (bounds_type->code () == TYPE_CODE_PTR)
bounds_type = bounds_type->target_type ();
if (bounds_type->code () != TYPE_CODE_STRUCT)
error (_("Unknown task name format. Aborting"));
upper_bound_fieldno = ada_get_field_index (bounds_type, "UB0", 0);
initialize_fieldnos = 0;
}
/* Get the size of the task image by checking the value of the bounds.
The lower bound is always 1, so we only need to read the upper bound. */
bounds_val = value_ind (value_field (val, bounds_fieldno));
len = value_as_long (value_field (bounds_val, upper_bound_fieldno));
/* Make sure that we do not read more than max_len characters... */
if (len > max_len)
len = max_len;
/* Extract LEN characters from the fat string. */
array_val = value_ind (value_field (val, array_fieldno));
read_memory (array_val->address (), (gdb_byte *) dest, len);
/* Add the NUL character to close the string. */
dest[len] = '\0';
}
/* Get, from the debugging information, the type description of all types
related to the Ada Task Control Block that are needed in order to
read the list of known tasks in the Ada runtime. If all of the info
needed to do so is found, then save that info in the module's per-
program-space data, and return NULL. Otherwise, if any information
cannot be found, leave the per-program-space data untouched, and
return an error message explaining what was missing (that error
message does NOT need to be deallocated). */
const char *
ada_get_tcb_types_info (void)
{
struct type *type;
struct type *common_type;
struct type *ll_type;
struct type *call_type;
struct atcb_fieldnos fieldnos;
struct ada_tasks_pspace_data *pspace_data;
const char *atcb_name = "system__tasking__ada_task_control_block___XVE";
const char *atcb_name_fixed = "system__tasking__ada_task_control_block";
const char *common_atcb_name = "system__tasking__common_atcb";
const char *private_data_name = "system__task_primitives__private_data";
const char *entry_call_record_name = "system__tasking__entry_call_record";
/* ATCB symbols may be found in several compilation units. As we
are only interested in one instance, use standard (literal,
C-like) lookups to get the first match. */
struct symbol *atcb_sym =
lookup_symbol_in_language (atcb_name, NULL, STRUCT_DOMAIN,
language_c, NULL).symbol;
const struct symbol *common_atcb_sym =
lookup_symbol_in_language (common_atcb_name, NULL, STRUCT_DOMAIN,
language_c, NULL).symbol;
const struct symbol *private_data_sym =
lookup_symbol_in_language (private_data_name, NULL, STRUCT_DOMAIN,
language_c, NULL).symbol;
const struct symbol *entry_call_record_sym =
lookup_symbol_in_language (entry_call_record_name, NULL, STRUCT_DOMAIN,
language_c, NULL).symbol;
if (atcb_sym == NULL || atcb_sym->type () == NULL)
{
/* In Ravenscar run-time libs, the ATCB does not have a dynamic
size, so the symbol name differs. */
atcb_sym = lookup_symbol_in_language (atcb_name_fixed, NULL,
STRUCT_DOMAIN, language_c,
NULL).symbol;
if (atcb_sym == NULL || atcb_sym->type () == NULL)
return _("Cannot find Ada_Task_Control_Block type");
type = atcb_sym->type ();
}
else
{
/* Get a static representation of the type record
Ada_Task_Control_Block. */
type = atcb_sym->type ();
type = ada_template_to_fixed_record_type_1 (type, NULL, 0, NULL, 0);
}
if (common_atcb_sym == NULL || common_atcb_sym->type () == NULL)
return _("Cannot find Common_ATCB type");
if (private_data_sym == NULL || private_data_sym->type ()== NULL)
return _("Cannot find Private_Data type");
if (entry_call_record_sym == NULL || entry_call_record_sym->type () == NULL)
return _("Cannot find Entry_Call_Record type");
/* Get the type for Ada_Task_Control_Block.Common. */
common_type = common_atcb_sym->type ();
/* Get the type for Ada_Task_Control_Bloc.Common.Call.LL. */
ll_type = private_data_sym->type ();
/* Get the type for Common_ATCB.Call.all. */
call_type = entry_call_record_sym->type ();
/* Get the field indices. */
fieldnos.common = ada_get_field_index (type, "common", 0);
fieldnos.entry_calls = ada_get_field_index (type, "entry_calls", 1);
fieldnos.atc_nesting_level =
ada_get_field_index (type, "atc_nesting_level", 1);
fieldnos.state = ada_get_field_index (common_type, "state", 0);
fieldnos.parent = ada_get_field_index (common_type, "parent", 1);
fieldnos.priority = ada_get_field_index (common_type, "base_priority", 0);
fieldnos.image = ada_get_field_index (common_type, "task_image", 1);
fieldnos.image_len = ada_get_field_index (common_type, "task_image_len", 1);
fieldnos.activation_link = ada_get_field_index (common_type,
"activation_link", 1);
fieldnos.call = ada_get_field_index (common_type, "call", 1);
fieldnos.ll = ada_get_field_index (common_type, "ll", 0);
fieldnos.base_cpu = ada_get_field_index (common_type, "base_cpu", 0);
fieldnos.ll_thread = ada_get_field_index (ll_type, "thread", 0);
fieldnos.ll_lwp = ada_get_field_index (ll_type, "lwp", 1);
fieldnos.call_self = ada_get_field_index (call_type, "self", 0);
/* On certain platforms such as x86-windows, the "lwp" field has been
named "thread_id". This field will likely be renamed in the future,
but we need to support both possibilities to avoid an unnecessary
dependency on a recent compiler. We therefore try locating the
"thread_id" field in place of the "lwp" field if we did not find
the latter. */
if (fieldnos.ll_lwp < 0)
fieldnos.ll_lwp = ada_get_field_index (ll_type, "thread_id", 1);
/* Check for the CPU offset. */
bound_minimal_symbol first_id_sym
= lookup_bound_minimal_symbol ("__gnat_gdb_cpu_first_id");
unsigned int first_id = 0;
if (first_id_sym.minsym != nullptr)
{
CORE_ADDR addr = first_id_sym.value_address ();
/* This symbol always has type uint32_t. */
struct type *u32type = builtin_type (target_gdbarch ())->builtin_uint32;
first_id = value_as_long (value_at (u32type, addr));
}
/* Set all the out parameters all at once, now that we are certain
that there are no potential error() anymore. */
pspace_data = get_ada_tasks_pspace_data (current_program_space);
pspace_data->initialized_p = 1;
pspace_data->atcb_type = type;
pspace_data->atcb_common_type = common_type;
pspace_data->atcb_ll_type = ll_type;
pspace_data->atcb_call_type = call_type;
pspace_data->atcb_fieldno = fieldnos;
pspace_data->cpu_id_offset = first_id;
return NULL;
}
/* Build the PTID of the task from its COMMON_VALUE, which is the "Common"
component of its ATCB record. This PTID needs to match the PTID used
by the thread layer. */
static ptid_t
ptid_from_atcb_common (struct value *common_value)
{
ULONGEST thread;
CORE_ADDR lwp = 0;
struct value *ll_value;
ptid_t ptid;
const struct ada_tasks_pspace_data *pspace_data
= get_ada_tasks_pspace_data (current_program_space);
ll_value = value_field (common_value, pspace_data->atcb_fieldno.ll);
if (pspace_data->atcb_fieldno.ll_lwp >= 0)
lwp = value_as_address (value_field (ll_value,
pspace_data->atcb_fieldno.ll_lwp));
thread = value_as_long (value_field (ll_value,
pspace_data->atcb_fieldno.ll_thread));
ptid = target_get_ada_task_ptid (lwp, thread);
return ptid;
}
/* Read the ATCB data of a given task given its TASK_ID (which is in practice
the address of its associated ATCB record), and store the result inside
TASK_INFO. */
static void
read_atcb (CORE_ADDR task_id, struct ada_task_info *task_info)
{
struct value *tcb_value;
struct value *common_value;
struct value *atc_nesting_level_value;
struct value *entry_calls_value;
struct value *entry_calls_value_element;
int called_task_fieldno = -1;
static const char ravenscar_task_name[] = "Ravenscar task";
const struct ada_tasks_pspace_data *pspace_data
= get_ada_tasks_pspace_data (current_program_space);
/* Clear the whole structure to start with, so that everything
is always initialized the same. */
memset (task_info, 0, sizeof (struct ada_task_info));
if (!pspace_data->initialized_p)
{
const char *err_msg = ada_get_tcb_types_info ();
if (err_msg != NULL)
error (_("%s. Aborting"), err_msg);
}
tcb_value = value_from_contents_and_address (pspace_data->atcb_type,
NULL, task_id);
common_value = value_field (tcb_value, pspace_data->atcb_fieldno.common);
/* Fill in the task_id. */
task_info->task_id = task_id;
/* Compute the name of the task.
Depending on the GNAT version used, the task image is either a fat
string, or a thin array of characters. Older versions of GNAT used
to use fat strings, and therefore did not need an extra field in
the ATCB to store the string length. For efficiency reasons, newer
versions of GNAT replaced the fat string by a static buffer, but this
also required the addition of a new field named "Image_Len" containing
the length of the task name. The method used to extract the task name
is selected depending on the existence of this field.
In some run-time libs (e.g. Ravenscar), the name is not in the ATCB;
we may want to get it from the first user frame of the stack. For now,
we just give a dummy name. */
if (pspace_data->atcb_fieldno.image_len == -1)
{
if (pspace_data->atcb_fieldno.image >= 0)
read_fat_string_value (task_info->name,
value_field (common_value,
pspace_data->atcb_fieldno.image),
sizeof (task_info->name) - 1);
else
{
struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol_by_pc (task_id);
if (msym.minsym)
{
const char *full_name = msym.minsym->linkage_name ();
const char *task_name = full_name;
const char *p;
/* Strip the prefix. */
for (p = full_name; *p; p++)
if (p[0] == '_' && p[1] == '_')
task_name = p + 2;
/* Copy the task name. */
strncpy (task_info->name, task_name,
sizeof (task_info->name) - 1);
task_info->name[sizeof (task_info->name) - 1] = 0;
}
else
{
/* No symbol found. Use a default name. */
strcpy (task_info->name, ravenscar_task_name);
}
}
}
else
{
int len = value_as_long
(value_field (common_value,
pspace_data->atcb_fieldno.image_len));
value_as_string (task_info->name,
value_field (common_value,
pspace_data->atcb_fieldno.image),
len);
}
/* Compute the task state and priority. */
task_info->state =
value_as_long (value_field (common_value,
pspace_data->atcb_fieldno.state));
task_info->priority =
value_as_long (value_field (common_value,
pspace_data->atcb_fieldno.priority));
/* If the ATCB contains some information about the parent task,
then compute it as well. Otherwise, zero. */
if (pspace_data->atcb_fieldno.parent >= 0)
task_info->parent =
value_as_address (value_field (common_value,
pspace_data->atcb_fieldno.parent));
/* If the task is in an entry call waiting for another task,
then determine which task it is. */
if (task_info->state == Entry_Caller_Sleep
&& pspace_data->atcb_fieldno.atc_nesting_level > 0
&& pspace_data->atcb_fieldno.entry_calls > 0)
{
/* Let My_ATCB be the Ada task control block of a task calling the
entry of another task; then the Task_Id of the called task is
in My_ATCB.Entry_Calls (My_ATCB.ATC_Nesting_Level).Called_Task. */
atc_nesting_level_value =
value_field (tcb_value, pspace_data->atcb_fieldno.atc_nesting_level);
entry_calls_value =
ada_coerce_to_simple_array_ptr
(value_field (tcb_value, pspace_data->atcb_fieldno.entry_calls));
entry_calls_value_element =
value_subscript (entry_calls_value,
value_as_long (atc_nesting_level_value));
called_task_fieldno =
ada_get_field_index (entry_calls_value_element->type (),
"called_task", 0);
task_info->called_task =
value_as_address (value_field (entry_calls_value_element,
called_task_fieldno));
}
/* If the ATCB contains some information about RV callers, then
compute the "caller_task". Otherwise, leave it as zero. */
if (pspace_data->atcb_fieldno.call >= 0)
{
/* Get the ID of the caller task from Common_ATCB.Call.all.Self.
If Common_ATCB.Call is null, then there is no caller. */
const CORE_ADDR call =
value_as_address (value_field (common_value,
pspace_data->atcb_fieldno.call));
struct value *call_val;
if (call != 0)
{
call_val =
value_from_contents_and_address (pspace_data->atcb_call_type,
NULL, call);
task_info->caller_task =
value_as_address
(value_field (call_val, pspace_data->atcb_fieldno.call_self));
}
}
task_info->base_cpu
= (pspace_data->cpu_id_offset
+ value_as_long (value_field (common_value,
pspace_data->atcb_fieldno.base_cpu)));
/* And finally, compute the task ptid. Note that there is not point
in computing it if the task is no longer alive, in which case
it is good enough to set its ptid to the null_ptid. */
if (ada_task_is_alive (task_info))
task_info->ptid = ptid_from_atcb_common (common_value);
else
task_info->ptid = null_ptid;
}
/* Read the ATCB info of the given task (identified by TASK_ID), and
add the result to the given inferior's TASK_LIST. */
static void
add_ada_task (CORE_ADDR task_id, struct inferior *inf)
{
struct ada_task_info task_info;
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
read_atcb (task_id, &task_info);
data->task_list.push_back (task_info);
}
/* Read the Known_Tasks array from the inferior memory, and store
it in the current inferior's TASK_LIST. Return true upon success. */
static bool
read_known_tasks_array (struct ada_tasks_inferior_data *data)
{
const int target_ptr_byte = data->known_tasks_element->length ();
const int known_tasks_size = target_ptr_byte * data->known_tasks_length;
gdb_byte *known_tasks = (gdb_byte *) alloca (known_tasks_size);
int i;
/* Build a new list by reading the ATCBs from the Known_Tasks array
in the Ada runtime. */
read_memory (data->known_tasks_addr, known_tasks, known_tasks_size);
for (i = 0; i < data->known_tasks_length; i++)
{
CORE_ADDR task_id =
extract_typed_address (known_tasks + i * target_ptr_byte,
data->known_tasks_element);
if (task_id != 0)
add_ada_task (task_id, current_inferior ());
}
return true;
}
/* Read the known tasks from the inferior memory, and store it in
the current inferior's TASK_LIST. Return true upon success. */
static bool
read_known_tasks_list (struct ada_tasks_inferior_data *data)
{
const int target_ptr_byte = data->known_tasks_element->length ();
gdb_byte *known_tasks = (gdb_byte *) alloca (target_ptr_byte);
CORE_ADDR task_id;
const struct ada_tasks_pspace_data *pspace_data
= get_ada_tasks_pspace_data (current_program_space);
/* Sanity check. */
if (pspace_data->atcb_fieldno.activation_link < 0)
return false;
/* Build a new list by reading the ATCBs. Read head of the list. */
read_memory (data->known_tasks_addr, known_tasks, target_ptr_byte);
task_id = extract_typed_address (known_tasks, data->known_tasks_element);
while (task_id != 0)
{
struct value *tcb_value;
struct value *common_value;
add_ada_task (task_id, current_inferior ());
/* Read the chain. */
tcb_value = value_from_contents_and_address (pspace_data->atcb_type,
NULL, task_id);
common_value = value_field (tcb_value, pspace_data->atcb_fieldno.common);
task_id = value_as_address
(value_field (common_value,
pspace_data->atcb_fieldno.activation_link));
}
return true;
}
/* Set all fields of the current inferior ada-tasks data pointed by DATA.
Do nothing if those fields are already set and still up to date. */
static void
ada_tasks_inferior_data_sniffer (struct ada_tasks_inferior_data *data)
{
struct bound_minimal_symbol msym;
struct symbol *sym;
/* Return now if already set. */
if (data->known_tasks_kind != ADA_TASKS_UNKNOWN)
return;
/* Try array. */
msym = lookup_minimal_symbol (KNOWN_TASKS_NAME, NULL, NULL);
if (msym.minsym != NULL)
{
data->known_tasks_kind = ADA_TASKS_ARRAY;
data->known_tasks_addr = msym.value_address ();
/* Try to get pointer type and array length from the symtab. */
sym = lookup_symbol_in_language (KNOWN_TASKS_NAME, NULL, VAR_DOMAIN,
language_c, NULL).symbol;
if (sym != NULL)
{
/* Validate. */
struct type *type = check_typedef (sym->type ());
struct type *eltype = NULL;
struct type *idxtype = NULL;
if (type->code () == TYPE_CODE_ARRAY)
eltype = check_typedef (type->target_type ());
if (eltype != NULL
&& eltype->code () == TYPE_CODE_PTR)
idxtype = check_typedef (type->index_type ());
if (idxtype != NULL
&& idxtype->bounds ()->low.is_constant ()
&& idxtype->bounds ()->high.is_constant ())
{
data->known_tasks_element = eltype;
data->known_tasks_length =
(idxtype->bounds ()->high.const_val ()
- idxtype->bounds ()->low.const_val () + 1);
return;
}
}
/* Fallback to default values. The runtime may have been stripped (as
in some distributions), but it is likely that the executable still
contains debug information on the task type (due to implicit with of
Ada.Tasking). */
data->known_tasks_element =
builtin_type (target_gdbarch ())->builtin_data_ptr;
data->known_tasks_length = MAX_NUMBER_OF_KNOWN_TASKS;
return;
}
/* Try list. */
msym = lookup_minimal_symbol (KNOWN_TASKS_LIST, NULL, NULL);
if (msym.minsym != NULL)
{
data->known_tasks_kind = ADA_TASKS_LIST;
data->known_tasks_addr = msym.value_address ();
data->known_tasks_length = 1;
sym = lookup_symbol_in_language (KNOWN_TASKS_LIST, NULL, VAR_DOMAIN,
language_c, NULL).symbol;
if (sym != NULL && sym->value_address () != 0)
{
/* Validate. */
struct type *type = check_typedef (sym->type ());
if (type->code () == TYPE_CODE_PTR)
{
data->known_tasks_element = type;
return;
}
}
/* Fallback to default values. */
data->known_tasks_element =
builtin_type (target_gdbarch ())->builtin_data_ptr;
data->known_tasks_length = 1;
return;
}
/* Can't find tasks. */
data->known_tasks_kind = ADA_TASKS_NOT_FOUND;
data->known_tasks_addr = 0;
}
/* Read the known tasks from the current inferior's memory, and store it
in the current inferior's data TASK_LIST. */
static void
read_known_tasks ()
{
struct ada_tasks_inferior_data *data =
get_ada_tasks_inferior_data (current_inferior ());
/* Step 1: Clear the current list, if necessary. */
data->task_list.clear ();
/* Step 2: do the real work.
If the application does not use task, then no more needs to be done.
It is important to have the task list cleared (see above) before we
return, as we don't want a stale task list to be used... This can
happen for instance when debugging a non-multitasking program after
having debugged a multitasking one. */
ada_tasks_inferior_data_sniffer (data);
gdb_assert (data->known_tasks_kind != ADA_TASKS_UNKNOWN);
/* Step 3: Set task_list_valid_p, to avoid re-reading the Known_Tasks
array unless needed. */
switch (data->known_tasks_kind)
{
case ADA_TASKS_NOT_FOUND: /* Tasking not in use in inferior. */
break;
case ADA_TASKS_ARRAY:
data->task_list_valid_p = read_known_tasks_array (data);
break;
case ADA_TASKS_LIST:
data->task_list_valid_p = read_known_tasks_list (data);
break;
}
}
/* Build the task_list by reading the Known_Tasks array from
the inferior, and return the number of tasks in that list
(zero means that the program is not using tasking at all). */
static int
ada_build_task_list ()
{
struct ada_tasks_inferior_data *data;
if (!target_has_stack ())
error (_("Cannot inspect Ada tasks when program is not running"));
data = get_ada_tasks_inferior_data (current_inferior ());
if (!data->task_list_valid_p)
read_known_tasks ();
return data->task_list.size ();
}
/* Print a table providing a short description of all Ada tasks
running inside inferior INF. If ARG_STR is set, it will be
interpreted as a task number, and the table will be limited to
that task only. */
void
print_ada_task_info (struct ui_out *uiout,
const char *arg_str,
struct inferior *inf)
{
struct ada_tasks_inferior_data *data;
int taskno, nb_tasks;
int taskno_arg = 0;
int nb_columns;
if (ada_build_task_list () == 0)
{
uiout->message (_("Your application does not use any Ada tasks.\n"));
return;
}
if (arg_str != NULL && arg_str[0] != '\0')
taskno_arg = value_as_long (parse_and_eval (arg_str));
if (uiout->is_mi_like_p ())
/* In GDB/MI mode, we want to provide the thread ID corresponding
to each task. This allows clients to quickly find the thread
associated to any task, which is helpful for commands that
take a --thread argument. However, in order to be able to
provide that thread ID, the thread list must be up to date
first. */
target_update_thread_list ();
data = get_ada_tasks_inferior_data (inf);
/* Compute the number of tasks that are going to be displayed
in the output. If an argument was given, there will be
at most 1 entry. Otherwise, there will be as many entries
as we have tasks. */
if (taskno_arg)
{
if (taskno_arg > 0 && taskno_arg <= data->task_list.size ())
nb_tasks = 1;
else
nb_tasks = 0;
}
else
nb_tasks = data->task_list.size ();
nb_columns = uiout->is_mi_like_p () ? 8 : 7;
ui_out_emit_table table_emitter (uiout, nb_columns, nb_tasks, "tasks");
uiout->table_header (1, ui_left, "current", "");
uiout->table_header (3, ui_right, "id", "ID");
{
size_t tid_width = 9;
/* Grown below in case the largest entry is bigger. */
if (!uiout->is_mi_like_p ())
{
for (taskno = 1; taskno <= data->task_list.size (); taskno++)
{
const struct ada_task_info *const task_info
= &data->task_list[taskno - 1];
gdb_assert (task_info != NULL);
tid_width = std::max (tid_width,
1 + strlen (phex_nz (task_info->task_id,
sizeof (CORE_ADDR))));
}
}
uiout->table_header (tid_width, ui_right, "task-id", "TID");
}
/* The following column is provided in GDB/MI mode only because
it is only really useful in that mode, and also because it
allows us to keep the CLI output shorter and more compact. */
if (uiout->is_mi_like_p ())
uiout->table_header (4, ui_right, "thread-id", "");
uiout->table_header (4, ui_right, "parent-id", "P-ID");
uiout->table_header (3, ui_right, "priority", "Pri");
uiout->table_header (22, ui_left, "state", "State");
/* Use ui_noalign for the last column, to prevent the CLI uiout
from printing an extra space at the end of each row. This
is a bit of a hack, but does get the job done. */
uiout->table_header (1, ui_noalign, "name", "Name");
uiout->table_body ();
for (taskno = 1; taskno <= data->task_list.size (); taskno++)
{
const struct ada_task_info *const task_info =
&data->task_list[taskno - 1];
int parent_id;
gdb_assert (task_info != NULL);
/* If the user asked for the output to be restricted
to one task only, and this is not the task, skip
to the next one. */
if (taskno_arg && taskno != taskno_arg)
continue;
ui_out_emit_tuple tuple_emitter (uiout, NULL);
/* Print a star if this task is the current task (or the task
currently selected). */
if (task_info->ptid == inferior_ptid)
uiout->field_string ("current", "*");
else
uiout->field_skip ("current");
/* Print the task number. */
uiout->field_signed ("id", taskno);
/* Print the Task ID. */
uiout->field_string ("task-id", phex_nz (task_info->task_id,
sizeof (CORE_ADDR)));
/* Print the associated Thread ID. */
if (uiout->is_mi_like_p ())
{
thread_info *thread = (ada_task_is_alive (task_info)
? inf->find_thread (task_info->ptid)
: nullptr);
if (thread != NULL)
uiout->field_signed ("thread-id", thread->global_num);
else
{
/* This can happen if the thread is no longer alive. */
uiout->field_skip ("thread-id");
}
}
/* Print the ID of the parent task. */
parent_id = get_task_number_from_id (task_info->parent, inf);
if (parent_id)
uiout->field_signed ("parent-id", parent_id);
else
uiout->field_skip ("parent-id");
/* Print the base priority of the task. */
uiout->field_signed ("priority", task_info->priority);
/* Print the task current state. */
if (task_info->caller_task)
uiout->field_fmt ("state",
_("Accepting RV with %-4d"),
get_task_number_from_id (task_info->caller_task,
inf));
else if (task_info->called_task)
uiout->field_fmt ("state",
_("Waiting on RV with %-3d"),
get_task_number_from_id (task_info->called_task,
inf));
else
uiout->field_string ("state", get_state (task_info->state));
/* Finally, print the task name, without quotes around it, as mi like
is not expecting quotes, and in non mi-like no need for quotes
as there is a specific column for the name. */
uiout->field_fmt ("name",
(task_info->name[0] != '\0'
? ui_file_style ()
: metadata_style.style ()),
"%s",
(task_info->name[0] != '\0'
? task_info->name
: _("<no name>")));
uiout->text ("\n");
}
}
/* Print a detailed description of the Ada task whose ID is TASKNO_STR
for the given inferior (INF). */
static void
info_task (struct ui_out *uiout, const char *taskno_str, struct inferior *inf)
{
const int taskno = value_as_long (parse_and_eval (taskno_str));
struct ada_task_info *task_info;
int parent_taskno = 0;
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
if (ada_build_task_list () == 0)
{
uiout->message (_("Your application does not use any Ada tasks.\n"));
return;
}
if (taskno <= 0 || taskno > data->task_list.size ())
error (_("Task ID %d not known. Use the \"info tasks\" command to\n"
"see the IDs of currently known tasks"), taskno);
task_info = &data->task_list[taskno - 1];
/* Print the Ada task ID. */
gdb_printf (_("Ada Task: %s\n"),
paddress (target_gdbarch (), task_info->task_id));
/* Print the name of the task. */
if (task_info->name[0] != '\0')
gdb_printf (_("Name: %s\n"), task_info->name);
else
fprintf_styled (gdb_stdout, metadata_style.style (), _("<no name>\n"));
/* Print the TID and LWP. */
gdb_printf (_("Thread: 0x%s\n"), phex_nz (task_info->ptid.tid (),
sizeof (ULONGEST)));
gdb_printf (_("LWP: %#lx\n"), task_info->ptid.lwp ());
/* If set, print the base CPU. */
if (task_info->base_cpu != 0)
gdb_printf (_("Base CPU: %d\n"), task_info->base_cpu);
/* Print who is the parent (if any). */
if (task_info->parent != 0)
parent_taskno = get_task_number_from_id (task_info->parent, inf);
if (parent_taskno)
{
struct ada_task_info *parent = &data->task_list[parent_taskno - 1];
gdb_printf (_("Parent: %d"), parent_taskno);
if (parent->name[0] != '\0')
gdb_printf (" (%s)", parent->name);
gdb_printf ("\n");
}
else
gdb_printf (_("No parent\n"));
/* Print the base priority. */
gdb_printf (_("Base Priority: %d\n"), task_info->priority);
/* print the task current state. */
{
int target_taskno = 0;
if (task_info->caller_task)
{
target_taskno = get_task_number_from_id (task_info->caller_task, inf);
gdb_printf (_("State: Accepting rendezvous with %d"),
target_taskno);
}
else if (task_info->called_task)
{
target_taskno = get_task_number_from_id (task_info->called_task, inf);
gdb_printf (_("State: Waiting on task %d's entry"),
target_taskno);
}
else
gdb_printf (_("State: %s"), get_long_state (task_info->state));
if (target_taskno)
{
ada_task_info *target_task_info = &data->task_list[target_taskno - 1];
if (target_task_info->name[0] != '\0')
gdb_printf (" (%s)", target_task_info->name);
}
gdb_printf ("\n");
}
}
/* If ARG is empty or null, then print a list of all Ada tasks.
Otherwise, print detailed information about the task whose ID
is ARG.
Does nothing if the program doesn't use Ada tasking. */
static void
info_tasks_command (const char *arg, int from_tty)
{
struct ui_out *uiout = current_uiout;
if (arg == NULL || *arg == '\0')
print_ada_task_info (uiout, NULL, current_inferior ());
else
info_task (uiout, arg, current_inferior ());
}
/* Print a message telling the user id of the current task.
This function assumes that tasking is in use in the inferior. */
static void
display_current_task_id (void)
{
const int current_task = ada_get_task_number (inferior_thread ());
if (current_task == 0)
gdb_printf (_("[Current task is unknown]\n"));
else
{
struct ada_tasks_inferior_data *data
= get_ada_tasks_inferior_data (current_inferior ());
struct ada_task_info *task_info = &data->task_list[current_task - 1];
gdb_printf (_("[Current task is %s]\n"),
task_to_str (current_task, task_info).c_str ());
}
}
/* Parse and evaluate TIDSTR into a task id, and try to switch to
that task. Print an error message if the task switch failed. */
static void
task_command_1 (const char *taskno_str, int from_tty, struct inferior *inf)
{
const int taskno = value_as_long (parse_and_eval (taskno_str));
struct ada_task_info *task_info;
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
if (taskno <= 0 || taskno > data->task_list.size ())
error (_("Task ID %d not known. Use the \"info tasks\" command to\n"
"see the IDs of currently known tasks"), taskno);
task_info = &data->task_list[taskno - 1];
if (!ada_task_is_alive (task_info))
error (_("Cannot switch to task %s: Task is no longer running"),
task_to_str (taskno, task_info).c_str ());
/* On some platforms, the thread list is not updated until the user
performs a thread-related operation (by using the "info threads"
command, for instance). So this thread list may not be up to date
when the user attempts this task switch. Since we cannot switch
to the thread associated to our task if GDB does not know about
that thread, we need to make sure that any new threads gets added
to the thread list. */
target_update_thread_list ();
/* Verify that the ptid of the task we want to switch to is valid
(in other words, a ptid that GDB knows about). Otherwise, we will
cause an assertion failure later on, when we try to determine
the ptid associated thread_info data. We should normally never
encounter such an error, but the wrong ptid can actually easily be
computed if target_get_ada_task_ptid has not been implemented for
our target (yet). Rather than cause an assertion error in that case,
it's nicer for the user to just refuse to perform the task switch. */
thread_info *tp = inf->find_thread (task_info->ptid);
if (tp == NULL)
error (_("Unable to compute thread ID for task %s.\n"
"Cannot switch to this task."),
task_to_str (taskno, task_info).c_str ());
switch_to_thread (tp);
ada_find_printable_frame (get_selected_frame (NULL));
gdb_printf (_("[Switching to task %s]\n"),
task_to_str (taskno, task_info).c_str ());
print_stack_frame (get_selected_frame (NULL),
frame_relative_level (get_selected_frame (NULL)),
SRC_AND_LOC, 1);
}
/* Print the ID of the current task if TASKNO_STR is empty or NULL.
Otherwise, switch to the task indicated by TASKNO_STR. */
static void
task_command (const char *taskno_str, int from_tty)
{
struct ui_out *uiout = current_uiout;
if (ada_build_task_list () == 0)
{
uiout->message (_("Your application does not use any Ada tasks.\n"));
return;
}
if (taskno_str == NULL || taskno_str[0] == '\0')
display_current_task_id ();
else
task_command_1 (taskno_str, from_tty, current_inferior ());
}
/* Indicate that the given inferior's task list may have changed,
so invalidate the cache. */
static void
ada_task_list_changed (struct inferior *inf)
{
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
data->task_list_valid_p = false;
}
/* Invalidate the per-program-space data. */
static void
ada_tasks_invalidate_pspace_data (struct program_space *pspace)
{
get_ada_tasks_pspace_data (pspace)->initialized_p = 0;
}
/* Invalidate the per-inferior data. */
static void
ada_tasks_invalidate_inferior_data (struct inferior *inf)
{
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
data->known_tasks_kind = ADA_TASKS_UNKNOWN;
data->task_list_valid_p = false;
}
/* The 'normal_stop' observer notification callback. */
static void
ada_tasks_normal_stop_observer (struct bpstat *unused_args, int unused_args2)
{
/* The inferior has been resumed, and just stopped. This means that
our task_list needs to be recomputed before it can be used again. */
ada_task_list_changed (current_inferior ());
}
/* Clear data associated to PSPACE and all inferiors using that program
space. */
static void
ada_tasks_clear_pspace_data (program_space *pspace)
{
/* The associated program-space data might have changed after
this objfile was added. Invalidate all cached data. */
ada_tasks_invalidate_pspace_data (pspace);
/* Invalidate the per-inferior cache for all inferiors using
this program space. */
for (inferior *inf : all_inferiors ())
if (inf->pspace == pspace)
ada_tasks_invalidate_inferior_data (inf);
}
/* Called when a new objfile was added. */
static void
ada_tasks_new_objfile_observer (objfile *objfile)
{
ada_tasks_clear_pspace_data (objfile->pspace);
}
/* The qcs command line flags for the "task apply" commands. Keep
this in sync with the "frame apply" commands. */
using qcs_flag_option_def
= gdb::option::flag_option_def<qcs_flags>;
static const gdb::option::option_def task_qcs_flags_option_defs[] = {
qcs_flag_option_def {
"q", [] (qcs_flags *opt) { return &opt->quiet; },
N_("Disables printing the task information."),
},
qcs_flag_option_def {
"c", [] (qcs_flags *opt) { return &opt->cont; },
N_("Print any error raised by COMMAND and continue."),
},
qcs_flag_option_def {
"s", [] (qcs_flags *opt) { return &opt->silent; },
N_("Silently ignore any errors or empty output produced by COMMAND."),
},
};
/* Create an option_def_group for the "task apply all" options, with
FLAGS as context. */
static inline std::array<gdb::option::option_def_group, 1>
make_task_apply_all_options_def_group (qcs_flags *flags)
{
return {{
{ {task_qcs_flags_option_defs}, flags },
}};
}
/* Create an option_def_group for the "task apply" options, with
FLAGS as context. */
static inline gdb::option::option_def_group
make_task_apply_options_def_group (qcs_flags *flags)
{
return {{task_qcs_flags_option_defs}, flags};
}
/* Implementation of 'task apply all'. */
static void
task_apply_all_command (const char *cmd, int from_tty)
{
qcs_flags flags;
auto group = make_task_apply_all_options_def_group (&flags);
gdb::option::process_options
(&cmd, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group);
validate_flags_qcs ("task apply all", &flags);
if (cmd == nullptr || *cmd == '\0')
error (_("Please specify a command at the end of 'task apply all'"));
update_thread_list ();
ada_build_task_list ();
inferior *inf = current_inferior ();
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
/* Save a copy of the thread list and increment each thread's
refcount while executing the command in the context of each
thread, in case the command affects this. */
std::vector<std::pair<int, thread_info_ref>> thr_list_cpy;
for (int i = 1; i <= data->task_list.size (); ++i)
{
ada_task_info &task = data->task_list[i - 1];
if (!ada_task_is_alive (&task))
continue;
thread_info *tp = inf->find_thread (task.ptid);
if (tp == nullptr)
warning (_("Unable to compute thread ID for task %s.\n"
"Cannot switch to this task."),
task_to_str (i, &task).c_str ());
else
thr_list_cpy.emplace_back (i, thread_info_ref::new_reference (tp));
}
scoped_restore_current_thread restore_thread;
for (const auto &info : thr_list_cpy)
if (switch_to_thread_if_alive (info.second.get ()))
thread_try_catch_cmd (info.second.get (), info.first, cmd,
from_tty, flags);
}
/* Implementation of 'task apply'. */
static void
task_apply_command (const char *tidlist, int from_tty)
{
if (tidlist == nullptr || *tidlist == '\0')
error (_("Please specify a task ID list"));
update_thread_list ();
ada_build_task_list ();
inferior *inf = current_inferior ();
struct ada_tasks_inferior_data *data = get_ada_tasks_inferior_data (inf);
/* Save a copy of the thread list and increment each thread's
refcount while executing the command in the context of each
thread, in case the command affects this. */
std::vector<std::pair<int, thread_info_ref>> thr_list_cpy;
number_or_range_parser parser (tidlist);
while (!parser.finished ())
{
int num = parser.get_number ();
if (num < 1 || num - 1 >= data->task_list.size ())
warning (_("no Ada Task with number %d"), num);
else
{
ada_task_info &task = data->task_list[num - 1];
if (!ada_task_is_alive (&task))
continue;
thread_info *tp = inf->find_thread (task.ptid);
if (tp == nullptr)
warning (_("Unable to compute thread ID for task %s.\n"
"Cannot switch to this task."),
task_to_str (num, &task).c_str ());
else
thr_list_cpy.emplace_back (num,
thread_info_ref::new_reference (tp));
}
}
qcs_flags flags;
const char *cmd = parser.cur_tok ();
auto group = make_task_apply_options_def_group (&flags);
gdb::option::process_options
(&cmd, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group);
validate_flags_qcs ("task apply", &flags);
if (*cmd == '\0')
error (_("Please specify a command following the task ID list"));
scoped_restore_current_thread restore_thread;
for (const auto &info : thr_list_cpy)
if (switch_to_thread_if_alive (info.second.get ()))
thread_try_catch_cmd (info.second.get (), info.first, cmd,
from_tty, flags);
}
void _initialize_tasks ();
void
_initialize_tasks ()
{
/* Attach various observers. */
gdb::observers::normal_stop.attach (ada_tasks_normal_stop_observer,
"ada-tasks");
gdb::observers::new_objfile.attach (ada_tasks_new_objfile_observer,
"ada-tasks");
gdb::observers::all_objfiles_removed.attach (ada_tasks_clear_pspace_data,
"ada-tasks");
static struct cmd_list_element *task_cmd_list;
static struct cmd_list_element *task_apply_list;
/* Some new commands provided by this module. */
add_info ("tasks", info_tasks_command,
_("Provide information about all known Ada tasks."));
add_prefix_cmd ("task", class_run, task_command,
_("Use this command to switch between Ada tasks.\n\
Without argument, this command simply prints the current task ID."),
&task_cmd_list, 1, &cmdlist);
#define TASK_APPLY_OPTION_HELP "\
Prints per-inferior task number followed by COMMAND output.\n\
\n\
By default, an error raised during the execution of COMMAND\n\
aborts \"task apply\".\n\
\n\
Options:\n\
%OPTIONS%"
static const auto task_apply_opts
= make_task_apply_options_def_group (nullptr);
static std::string task_apply_help = gdb::option::build_help (_("\
Apply a command to a list of tasks.\n\
Usage: task apply ID... [OPTION]... COMMAND\n\
ID is a space-separated list of IDs of tasks to apply COMMAND on.\n"
TASK_APPLY_OPTION_HELP), task_apply_opts);
add_prefix_cmd ("apply", class_run,
task_apply_command,
task_apply_help.c_str (),
&task_apply_list, 1,
&task_cmd_list);
static const auto task_apply_all_opts
= make_task_apply_all_options_def_group (nullptr);
static std::string task_apply_all_help = gdb::option::build_help (_("\
Apply a command to all tasks in the current inferior.\n\
\n\
Usage: task apply all [OPTION]... COMMAND\n"
TASK_APPLY_OPTION_HELP), task_apply_all_opts);
add_cmd ("all", class_run, task_apply_all_command,
task_apply_all_help.c_str (), &task_apply_list);
}
|