aboutsummaryrefslogtreecommitdiff
path: root/gdb/stack.c
blob: 4899d0f416984f3a7237ea8959f57ce5bb53c2bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
/* Print and select stack frames for GDB, the GNU debugger.

   Copyright (C) 1986-2019 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 "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 "source.h"
#include "breakpoint.h"
#include "demangle.h"
#include "inferior.h"
#include "annotate.h"
#include "ui-out.h"
#include "block.h"
#include "stack.h"
#include "dictionary.h"
#include "reggroups.h"
#include "regcache.h"
#include "solib.h"
#include "valprint.h"
#include "gdbthread.h"
#include "cp-support.h"
#include "disasm.h"
#include "inline-frame.h"
#include "linespec.h"
#include "cli/cli-utils.h"
#include "objfiles.h"
#include "annotate.h"

#include "symfile.h"
#include "extension.h"
#include "observable.h"
#include "gdbsupport/def-vector.h"
#include "cli/cli-option.h"
#include "cli/cli-style.h"

/* The possible choices of "set print frame-arguments", and the value
   of this setting.  */

const char print_frame_arguments_all[] = "all";
const char print_frame_arguments_scalars[] = "scalars";
const char print_frame_arguments_none[] = "none";
const char print_frame_arguments_presence[] = "presence";

static const char *const print_frame_arguments_choices[] =
{
  print_frame_arguments_all,
  print_frame_arguments_scalars,
  print_frame_arguments_none,
  print_frame_arguments_presence,
  NULL
};

/* The possible choices of "set print frame-info", and the value
   of this setting.  */

const char print_frame_info_auto[] = "auto";
const char print_frame_info_source_line[] = "source-line";
const char print_frame_info_location[] = "location";
const char print_frame_info_source_and_location[] = "source-and-location";
const char print_frame_info_location_and_address[] = "location-and-address";
const char print_frame_info_short_location[] = "short-location";

static const char *const print_frame_info_choices[] =
{
  print_frame_info_auto,
  print_frame_info_source_line,
  print_frame_info_location,
  print_frame_info_source_and_location,
  print_frame_info_location_and_address,
  print_frame_info_short_location,
  NULL
};

/* print_frame_info_print_what[i] maps a choice to the corresponding
   print_what enum.  */
static const gdb::optional<enum print_what> print_frame_info_print_what[] =
  {{}, /* Empty value for "auto".  */
   SRC_LINE, LOCATION, SRC_AND_LOC, LOC_AND_ADDRESS, SHORT_LOCATION};

/* The possible choices of "set print entry-values", and the value
   of this setting.  */

const char print_entry_values_no[] = "no";
const char print_entry_values_only[] = "only";
const char print_entry_values_preferred[] = "preferred";
const char print_entry_values_if_needed[] = "if-needed";
const char print_entry_values_both[] = "both";
const char print_entry_values_compact[] = "compact";
const char print_entry_values_default[] = "default";
static const char *const print_entry_values_choices[] =
{
  print_entry_values_no,
  print_entry_values_only,
  print_entry_values_preferred,
  print_entry_values_if_needed,
  print_entry_values_both,
  print_entry_values_compact,
  print_entry_values_default,
  NULL
};

/* See frame.h.  */
frame_print_options user_frame_print_options;

/* Option definitions for some frame-related "set print ..."
   settings.  */

using boolean_option_def
  = gdb::option::boolean_option_def<frame_print_options>;
using enum_option_def
  = gdb::option::enum_option_def<frame_print_options>;

static const gdb::option::option_def frame_print_option_defs[] = {

  enum_option_def {
    "entry-values",
    print_entry_values_choices,
    [] (frame_print_options *opt) { return &opt->print_entry_values; },
    NULL, /* show_cmd_cb */
    N_("Set printing of function arguments at function entry."),
    N_("Show printing of function arguments at function entry."),
    N_("GDB can sometimes determine the values of function arguments at entry,\n\
in addition to their current values.  This option tells GDB whether\n\
to print the current value, the value at entry (marked as val@entry),\n\
or both.  Note that one or both of these values may be <optimized out>."),
  },

  enum_option_def {
    "frame-arguments",
    print_frame_arguments_choices,
    [] (frame_print_options *opt) { return &opt->print_frame_arguments; },
    NULL, /* show_cmd_cb */
    N_("Set printing of non-scalar frame arguments."),
    N_("Show printing of non-scalar frame arguments."),
    NULL /* help_doc */
  },

  boolean_option_def {
    "raw-frame-arguments",
    [] (frame_print_options *opt) { return &opt->print_raw_frame_arguments; },
    NULL, /* show_cmd_cb */
    N_("Set whether to print frame arguments in raw form."),
    N_("Show whether to print frame arguments in raw form."),
    N_("If set, frame arguments are printed in raw form, bypassing any\n\
pretty-printers for that value.")
  },

  enum_option_def {
    "frame-info",
    print_frame_info_choices,
    [] (frame_print_options *opt) { return &opt->print_frame_info; },
    NULL, /* show_cmd_cb */
    N_("Set printing of frame information."),
    N_("Show printing of frame information."),
    NULL /* help_doc */
  }

};

/* Options for the "backtrace" command.  */

struct backtrace_cmd_options
{
  bool full = false;
  bool no_filters = false;
  bool hide = false;
};

using bt_flag_option_def
  = gdb::option::flag_option_def<backtrace_cmd_options>;

static const gdb::option::option_def backtrace_command_option_defs[] = {
  bt_flag_option_def {
    "full",
    [] (backtrace_cmd_options *opt) { return &opt->full; },
    N_("Print values of local variables.")
  },

  bt_flag_option_def {
    "no-filters",
    [] (backtrace_cmd_options *opt) { return &opt->no_filters; },
    N_("Prohibit frame filters from executing on a backtrace."),
  },

  bt_flag_option_def {
    "hide",
    [] (backtrace_cmd_options *opt) { return &opt->hide; },
    N_("Causes Python frame filter elided frames to not be printed."),
  },
};

/* Prototypes for local functions.  */

static void print_frame_local_vars (struct frame_info *frame,
				    bool quiet,
				    const char *regexp, const char *t_regexp,
				    int num_tabs, struct ui_file *stream);

static void print_frame (const frame_print_options &opts,
			 frame_info *frame, int print_level,
			 enum print_what print_what,  int print_args,
			 struct symtab_and_line sal);

static void set_last_displayed_sal (int valid,
				    struct program_space *pspace,
				    CORE_ADDR addr,
				    struct symtab *symtab,
				    int line);

static struct frame_info *find_frame_for_function (const char *);
static struct frame_info *find_frame_for_address (CORE_ADDR);

/* 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;

/* These variables hold the last symtab and line we displayed to the user.
 * This is where we insert a breakpoint or a skiplist entry by default.  */
static int last_displayed_sal_valid = 0;
static struct program_space *last_displayed_pspace = 0;
static CORE_ADDR last_displayed_addr = 0;
static struct symtab *last_displayed_symtab = 0;
static int last_displayed_line = 0;


/* See stack.h.  */

int
frame_show_address (struct frame_info *frame,
		    struct symtab_and_line sal)
{
  /* If there is a line number, but no PC, then there is no location
     information associated with this sal.  The only way that should
     happen is for the call sites of inlined functions (SAL comes from
     find_frame_sal).  Otherwise, we would have some PC range if the
     SAL came from a line table.  */
  if (sal.line != 0 && sal.pc == 0 && sal.end == 0)
    {
      if (get_next_frame (frame) == NULL)
	gdb_assert (inline_skipped_frames (inferior_thread ()) > 0);
      else
	gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME);
      return 0;
    }

  return get_frame_pc (frame) != sal.pc;
}

/* See frame.h.  */

void
print_stack_frame_to_uiout (struct ui_out *uiout, struct frame_info *frame,
			    int print_level, enum print_what print_what,
			    int set_current_sal)
{
  scoped_restore save_uiout = make_scoped_restore (&current_uiout, uiout);

  print_stack_frame (frame, print_level, print_what, set_current_sal);
}

/* Show or print a stack frame FRAME briefly.  The output is formatted
   according to PRINT_LEVEL and PRINT_WHAT printing the frame's
   relative level, function name, argument list, and file name and
   line number.  If the frame's PC is not at the beginning of the
   source line, the actual PC is printed at the beginning.  */

void
print_stack_frame (struct frame_info *frame, int print_level,
		   enum print_what print_what,
		   int set_current_sal)
{

  /* For mi, alway print location and address.  */
  if (current_uiout->is_mi_like_p ())
    print_what = LOC_AND_ADDRESS;

  try
    {
      print_frame_info (user_frame_print_options,
			frame, print_level, print_what, 1 /* print_args */,
			set_current_sal);
      if (set_current_sal)
	set_current_sal_from_frame (frame);
    }
  catch (const gdb_exception_error &e)
    {
    }
}

/* Print nameless arguments of frame FRAME on STREAM, where START is
   the offset of the first nameless argument, and NUM is the number of
   nameless arguments to print.  FIRST is nonzero if this is the first
   argument (not just the first nameless argument).  */

static void
print_frame_nameless_args (struct frame_info *frame, long start, int num,
			   int first, struct ui_file *stream)
{
  struct gdbarch *gdbarch = get_frame_arch (frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  int i;
  CORE_ADDR argsaddr;
  long arg_value;

  for (i = 0; i < num; i++)
    {
      QUIT;
      argsaddr = get_frame_args_address (frame);
      if (!argsaddr)
	return;
      arg_value = read_memory_integer (argsaddr + start,
				       sizeof (int), byte_order);
      if (!first)
	fprintf_filtered (stream, ", ");
      fprintf_filtered (stream, "%ld", arg_value);
      first = 0;
      start += sizeof (int);
    }
}

/* Print single argument of inferior function.  ARG must be already
   read in.

   Errors are printed as if they would be the parameter value.  Use zeroed ARG
   iff it should not be printed accoring to user settings.  */

static void
print_frame_arg (const frame_print_options &fp_opts,
		 const struct frame_arg *arg)
{
  struct ui_out *uiout = current_uiout;

  string_file stb;

  gdb_assert (!arg->val || !arg->error);
  gdb_assert (arg->entry_kind == print_entry_values_no
	      || arg->entry_kind == print_entry_values_only
	      || (!uiout->is_mi_like_p ()
		  && arg->entry_kind == print_entry_values_compact));

  annotate_arg_emitter arg_emitter;
  ui_out_emit_tuple tuple_emitter (uiout, NULL);
  fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym),
			   SYMBOL_LANGUAGE (arg->sym), DMGL_PARAMS | DMGL_ANSI);
  if (arg->entry_kind == print_entry_values_compact)
    {
      /* It is OK to provide invalid MI-like stream as with
	 PRINT_ENTRY_VALUE_COMPACT we never use MI.  */
      stb.puts ("=");

      fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym),
			       SYMBOL_LANGUAGE (arg->sym),
			       DMGL_PARAMS | DMGL_ANSI);
    }
  if (arg->entry_kind == print_entry_values_only
      || arg->entry_kind == print_entry_values_compact)
    stb.puts ("@entry");
  uiout->field_stream ("name", stb, variable_name_style.style ());
  annotate_arg_name_end ();
  uiout->text ("=");

  if (!arg->val && !arg->error)
    uiout->text ("...");
  else
    {
      if (arg->error)
	stb.printf (_("<error reading variable: %s>"), arg->error.get ());
      else
	{
	  try
	    {
	      const struct language_defn *language;
	      struct value_print_options vp_opts;

	      /* Avoid value_print because it will deref ref parameters.  We
		 just want to print their addresses.  Print ??? for args whose
		 address we do not know.  We pass 2 as "recurse" to val_print
		 because our standard indentation here is 4 spaces, and
		 val_print indents 2 for each recurse.  */ 

	      annotate_arg_value (value_type (arg->val));

	      /* Use the appropriate language to display our symbol, unless the
		 user forced the language to a specific language.  */
	      if (language_mode == language_mode_auto)
		language = language_def (SYMBOL_LANGUAGE (arg->sym));
	      else
		language = current_language;

	      get_no_prettyformat_print_options (&vp_opts);
	      vp_opts.deref_ref = 1;
	      vp_opts.raw = fp_opts.print_raw_frame_arguments;

	      /* True in "summary" mode, false otherwise.  */
	      vp_opts.summary
		= fp_opts.print_frame_arguments == print_frame_arguments_scalars;

	      common_val_print (arg->val, &stb, 2, &vp_opts, language);
	    }
	  catch (const gdb_exception_error &except)
	    {
	      stb.printf (_("<error reading variable: %s>"),
			  except.what ());
	    }
	}
    }

  uiout->field_stream ("value", stb);
}

/* Read in inferior function local SYM at FRAME into ARGP.  Caller is
   responsible for xfree of ARGP->ERROR.  This function never throws an
   exception.  */

void
read_frame_local (struct symbol *sym, struct frame_info *frame,
		  struct frame_arg *argp)
{
  argp->sym = sym;
  argp->val = NULL;
  argp->error = NULL;

  try
    {
      argp->val = read_var_value (sym, NULL, frame);
    }
  catch (const gdb_exception_error &except)
    {
      argp->error.reset (xstrdup (except.what ()));
    }
}

/* Read in inferior function parameter SYM at FRAME into ARGP.  This
   function never throws an exception.  */

void
read_frame_arg (const frame_print_options &fp_opts,
		symbol *sym, frame_info *frame,
	        struct frame_arg *argp, struct frame_arg *entryargp)
{
  struct value *val = NULL, *entryval = NULL;
  char *val_error = NULL, *entryval_error = NULL;
  int val_equal = 0;

  if (fp_opts.print_entry_values != print_entry_values_only
      && fp_opts.print_entry_values != print_entry_values_preferred)
    {
      try
	{
	  val = read_var_value (sym, NULL, frame);
	}
      catch (const gdb_exception_error &except)
	{
	  val_error = (char *) alloca (except.message->size () + 1);
	  strcpy (val_error, except.what ());
	}
    }

  if (SYMBOL_COMPUTED_OPS (sym) != NULL
      && SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry != NULL
      && fp_opts.print_entry_values != print_entry_values_no
      && (fp_opts.print_entry_values != print_entry_values_if_needed
	  || !val || value_optimized_out (val)))
    {
      try
	{
	  const struct symbol_computed_ops *ops;

	  ops = SYMBOL_COMPUTED_OPS (sym);
	  entryval = ops->read_variable_at_entry (sym, frame);
	}
      catch (const gdb_exception_error &except)
	{
	  if (except.error != NO_ENTRY_VALUE_ERROR)
	    {
	      entryval_error = (char *) alloca (except.message->size () + 1);
	      strcpy (entryval_error, except.what ());
	    }
	}

      if (entryval != NULL && value_optimized_out (entryval))
	entryval = NULL;

      if (fp_opts.print_entry_values == print_entry_values_compact
	  || fp_opts.print_entry_values == print_entry_values_default)
	{
	  /* For MI do not try to use print_entry_values_compact for ARGP.  */

	  if (val && entryval && !current_uiout->is_mi_like_p ())
	    {
	      struct type *type = value_type (val);

	      if (value_lazy (val))
		value_fetch_lazy (val);
	      if (value_lazy (entryval))
		value_fetch_lazy (entryval);

	      if (value_contents_eq (val, 0, entryval, 0, TYPE_LENGTH (type)))
		{
		  /* Initialize it just to avoid a GCC false warning.  */
		  struct value *val_deref = NULL, *entryval_deref;

		  /* DW_AT_call_value does match with the current
		     value.  If it is a reference still try to verify if
		     dereferenced DW_AT_call_data_value does not differ.  */

		  try
		    {
		      struct type *type_deref;

		      val_deref = coerce_ref (val);
		      if (value_lazy (val_deref))
			value_fetch_lazy (val_deref);
		      type_deref = value_type (val_deref);

		      entryval_deref = coerce_ref (entryval);
		      if (value_lazy (entryval_deref))
			value_fetch_lazy (entryval_deref);

		      /* If the reference addresses match but dereferenced
			 content does not match print them.  */
		      if (val != val_deref
			  && value_contents_eq (val_deref, 0,
						entryval_deref, 0,
						TYPE_LENGTH (type_deref)))
			val_equal = 1;
		    }
		  catch (const gdb_exception_error &except)
		    {
		      /* If the dereferenced content could not be
			 fetched do not display anything.  */
		      if (except.error == NO_ENTRY_VALUE_ERROR)
			val_equal = 1;
		      else if (except.message != NULL)
			{
			  entryval_error
			    = (char *) alloca (except.message->size () + 1);
			  strcpy (entryval_error, except.what ());
			}
		    }

		  /* Value was not a reference; and its content matches.  */
		  if (val == val_deref)
		    val_equal = 1;

		  if (val_equal)
		    entryval = NULL;
		}
	    }

	  /* Try to remove possibly duplicate error message for ENTRYARGP even
	     in MI mode.  */

	  if (val_error && entryval_error
	      && strcmp (val_error, entryval_error) == 0)
	    {
	      entryval_error = NULL;

	      /* Do not se VAL_EQUAL as the same error message may be shown for
		 the entry value even if no entry values are present in the
		 inferior.  */
	    }
	}
    }

  if (entryval == NULL)
    {
      if (fp_opts.print_entry_values == print_entry_values_preferred)
	{
	  gdb_assert (val == NULL);

	  try
	    {
	      val = read_var_value (sym, NULL, frame);
	    }
	  catch (const gdb_exception_error &except)
	    {
	      val_error = (char *) alloca (except.message->size () + 1);
	      strcpy (val_error, except.what ());
	    }
	}
      if (fp_opts.print_entry_values == print_entry_values_only
	  || fp_opts.print_entry_values == print_entry_values_both
	  || (fp_opts.print_entry_values == print_entry_values_preferred
	      && (!val || value_optimized_out (val))))
	{
	  entryval = allocate_optimized_out_value (SYMBOL_TYPE (sym));
	  entryval_error = NULL;
	}
    }
  if ((fp_opts.print_entry_values == print_entry_values_compact
       || fp_opts.print_entry_values == print_entry_values_if_needed
       || fp_opts.print_entry_values == print_entry_values_preferred)
      && (!val || value_optimized_out (val)) && entryval != NULL)
    {
      val = NULL;
      val_error = NULL;
    }

  argp->sym = sym;
  argp->val = val;
  argp->error.reset (val_error ? xstrdup (val_error) : NULL);
  if (!val && !val_error)
    argp->entry_kind = print_entry_values_only;
  else if ((fp_opts.print_entry_values == print_entry_values_compact
	   || fp_opts.print_entry_values == print_entry_values_default)
	   && val_equal)
    {
      argp->entry_kind = print_entry_values_compact;
      gdb_assert (!current_uiout->is_mi_like_p ());
    }
  else
    argp->entry_kind = print_entry_values_no;

  entryargp->sym = sym;
  entryargp->val = entryval;
  entryargp->error.reset (entryval_error ? xstrdup (entryval_error) : NULL);
  if (!entryval && !entryval_error)
    entryargp->entry_kind = print_entry_values_no;
  else
    entryargp->entry_kind = print_entry_values_only;
}

/* Print the arguments of frame FRAME on STREAM, given the function
   FUNC running in that frame (as a symbol), where NUM is the number
   of arguments according to the stack frame (or -1 if the number of
   arguments is unknown).  */

/* Note that currently the "number of arguments according to the
   stack frame" is only known on VAX where i refers to the "number of
   ints of arguments according to the stack frame".  */

static void
print_frame_args (const frame_print_options &fp_opts,
		  struct symbol *func, struct frame_info *frame,
		  int num, struct ui_file *stream)
{
  struct ui_out *uiout = current_uiout;
  int first = 1;
  /* Offset of next stack argument beyond the one we have seen that is
     at the highest offset, or -1 if we haven't come to a stack
     argument yet.  */
  long highest_offset = -1;
  /* Number of ints of arguments that we have printed so far.  */
  int args_printed = 0;
  /* True if we should print arg names.  If false, we only indicate
     the presence of arguments by printing ellipsis.  */
  bool print_names
    = fp_opts.print_frame_arguments != print_frame_arguments_presence;
  /* True if we should print arguments, false otherwise.  */
  bool print_args
    = (print_names
       && fp_opts.print_frame_arguments != print_frame_arguments_none);

  if (func)
    {
      const struct block *b = SYMBOL_BLOCK_VALUE (func);
      struct block_iterator iter;
      struct symbol *sym;

      ALL_BLOCK_SYMBOLS (b, iter, sym)
        {
	  struct frame_arg arg, entryarg;

	  QUIT;

	  /* Keep track of the highest stack argument offset seen, and
	     skip over any kinds of symbols we don't care about.  */

	  if (!SYMBOL_IS_ARGUMENT (sym))
	    continue;

	  if (!print_names)
	    {
	      uiout->text ("...");
	      first = 0;
	      break;
	    }

	  switch (SYMBOL_CLASS (sym))
	    {
	    case LOC_ARG:
	    case LOC_REF_ARG:
	      {
		long current_offset = SYMBOL_VALUE (sym);
		int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));

		/* Compute address of next argument by adding the size of
		   this argument and rounding to an int boundary.  */
		current_offset =
		  ((current_offset + arg_size + sizeof (int) - 1)
		   & ~(sizeof (int) - 1));

		/* If this is the highest offset seen yet, set
		   highest_offset.  */
		if (highest_offset == -1
		    || (current_offset > highest_offset))
		  highest_offset = current_offset;

		/* Add the number of ints we're about to print to
		   args_printed.  */
		args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
	      }

	      /* We care about types of symbols, but don't need to
		 keep track of stack offsets in them.  */
	    case LOC_REGISTER:
	    case LOC_REGPARM_ADDR:
	    case LOC_COMPUTED:
	    case LOC_OPTIMIZED_OUT:
	    default:
	      break;
	    }

	  /* 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 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).  */
	  /* But if the parameter name is null, don't try it.  Null
	     parameter names occur on the RS/6000, for traceback
	     tables.  FIXME, should we even print them?  */

	  if (*SYMBOL_LINKAGE_NAME (sym))
	    {
	      struct symbol *nsym;

	      nsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym),
						b, VAR_DOMAIN).symbol;
	      gdb_assert (nsym != NULL);
	      if (SYMBOL_CLASS (nsym) == LOC_REGISTER
		  && !SYMBOL_IS_ARGUMENT (nsym))
		{
		  /* There is a LOC_ARG/LOC_REGISTER pair.  This means
		     that it was passed on the stack and loaded into a
		     register, or passed in a register and stored in a
		     stack slot.  GDB 3.x used the LOC_ARG; GDB
		     4.0-4.11 used the LOC_REGISTER.

		     Reasons for using the LOC_ARG:

		     (1) Because find_saved_registers may be slow for
		         remote debugging.

		     (2) Because registers are often re-used and stack
		         slots rarely (never?) are.  Therefore using
		         the stack slot is much less likely to print
		         garbage.

		     Reasons why we might want to use the LOC_REGISTER:

		     (1) So that the backtrace prints the same value
		         as "print foo".  I see no compelling reason
		         why this needs to be the case; having the
		         backtrace print the value which was passed
		         in, and "print foo" print the value as
		         modified within the called function, makes
		         perfect sense to me.

		     Additional note: It might be nice if "info args"
		     displayed both values.

		     One more note: There is a case with SPARC
		     structure passing where we need to use the
		     LOC_REGISTER, but this is dealt with by creating
		     a single LOC_REGPARM in symbol reading.  */

		  /* Leave sym (the LOC_ARG) alone.  */
		  ;
		}
	      else
		sym = nsym;
	    }

	  /* Print the current arg.  */
	  if (!first)
	    uiout->text (", ");
	  uiout->wrap_hint ("    ");

	  if (!print_args)
	    {
	      arg.sym = sym;
	      arg.entry_kind = print_entry_values_no;
	      entryarg.sym = sym;
	      entryarg.entry_kind = print_entry_values_no;
	    }
	  else
	    read_frame_arg (fp_opts, sym, frame, &arg, &entryarg);

	  if (arg.entry_kind != print_entry_values_only)
	    print_frame_arg (fp_opts, &arg);

	  if (entryarg.entry_kind != print_entry_values_no)
	    {
	      if (arg.entry_kind != print_entry_values_only)
		{
		  uiout->text (", ");
		  uiout->wrap_hint ("    ");
		}

	      print_frame_arg (fp_opts, &entryarg);
	    }

	  first = 0;
	}
    }

  /* Don't print nameless args in situations where we don't know
     enough about the stack to find them.  */
  if (num != -1)
    {
      long start;

      if (highest_offset == -1)
	start = gdbarch_frame_args_skip (get_frame_arch (frame));
      else
	start = highest_offset;

      if (!print_names && !first && num > 0)
	uiout->text ("...");
      else
	print_frame_nameless_args (frame, start, num - args_printed,
				   first, stream);
    }
}

/* Set the current source and line to the location given by frame
   FRAME, if possible.  When CENTER is true, adjust so the relevant
   line is in the center of the next 'list'.  */

void
set_current_sal_from_frame (struct frame_info *frame)
{
  symtab_and_line sal = find_frame_sal (frame);
  if (sal.symtab != NULL)
    set_current_source_symtab_and_line (sal);
}

/* If ON, GDB will display disassembly of the next source line when
   execution of the program being debugged stops.
   If AUTO (which is the default), or there's no line info to determine
   the source line of the next instruction, display disassembly of next
   instruction instead.  */

static enum auto_boolean disassemble_next_line;

static void
show_disassemble_next_line (struct ui_file *file, int from_tty,
				 struct cmd_list_element *c,
				 const char *value)
{
  fprintf_filtered (file,
		    _("Debugger's willingness to use "
		      "disassemble-next-line is %s.\n"),
                    value);
}

/* Use TRY_CATCH to catch the exception from the gdb_disassembly
   because it will be broken by filter sometime.  */

static void
do_gdb_disassembly (struct gdbarch *gdbarch,
		    int how_many, CORE_ADDR low, CORE_ADDR high)
{

  try
    {
      gdb_disassembly (gdbarch, current_uiout,
		       DISASSEMBLY_RAW_INSN, how_many,
		       low, high);
    }
  catch (const gdb_exception_error &exception)
    {
      /* If an exception was thrown while doing the disassembly, print
	 the error message, to give the user a clue of what happened.  */
      exception_print (gdb_stderr, exception);
    }
}

/* Converts the PRINT_FRAME_INFO choice to an optional enum print_what.
   Value not present indicates to the caller to use default values
   specific to the command being executed.  */

static gdb::optional<enum print_what>
print_frame_info_to_print_what (const char *print_frame_info)
{
  for (int i = 0; print_frame_info_choices[i] != NULL; i++)
    if (print_frame_info == print_frame_info_choices[i])
      return print_frame_info_print_what[i];

  internal_error (__FILE__, __LINE__,
		  "Unexpected print frame-info value `%s'.",
		  print_frame_info);
}

/* Print the PC from FRAME, plus any flags, to UIOUT.  */

static void
print_pc (struct ui_out *uiout, struct gdbarch *gdbarch, frame_info *frame,
	  CORE_ADDR pc)
{
  uiout->field_core_addr ("addr", gdbarch, pc);

  std::string flags = gdbarch_get_pc_address_flags (gdbarch, frame, pc);
  if (!flags.empty ())
  {
    uiout->text (" [");
    uiout->field_string ("addr_flags", flags);
    uiout->text ("]");
  }
}

/* See stack.h.  */

void
get_user_print_what_frame_info (gdb::optional<enum print_what> *what)
{
  *what
    = print_frame_info_to_print_what
        (user_frame_print_options.print_frame_info);
}

/* Print information about frame FRAME.  The output is format according
   to PRINT_LEVEL and PRINT_WHAT and PRINT_ARGS.  For the meaning of
   PRINT_WHAT, see enum print_what comments in frame.h.
   Note that PRINT_WHAT is overriden if FP_OPTS.print_frame_info
   != print_frame_info_auto.

   Used in "where" output, and to emit breakpoint or step
   messages.  */

void
print_frame_info (const frame_print_options &fp_opts,
		  frame_info *frame, int print_level,
		  enum print_what print_what, int print_args,
		  int set_current_sal)
{
  struct gdbarch *gdbarch = get_frame_arch (frame);
  int source_print;
  int location_print;
  struct ui_out *uiout = current_uiout;

  if (!current_uiout->is_mi_like_p ()
      && fp_opts.print_frame_info != print_frame_info_auto)
    {
      /* Use the specific frame information desired by the user.  */
      print_what = *print_frame_info_to_print_what (fp_opts.print_frame_info);
    }

  if (get_frame_type (frame) == DUMMY_FRAME
      || get_frame_type (frame) == SIGTRAMP_FRAME
      || get_frame_type (frame) == ARCH_FRAME)
    {
      ui_out_emit_tuple tuple_emitter (uiout, "frame");

      annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
			    gdbarch, get_frame_pc (frame));

      /* Do this regardless of SOURCE because we don't have any source
         to list for this frame.  */
      if (print_level)
        {
          uiout->text ("#");
          uiout->field_fmt_signed (2, ui_left, "level",
				   frame_relative_level (frame));
        }
      if (uiout->is_mi_like_p ())
        {
          annotate_frame_address ();
	  print_pc (uiout, gdbarch, frame, get_frame_pc (frame));
          annotate_frame_address_end ();
        }

      if (get_frame_type (frame) == DUMMY_FRAME)
        {
          annotate_function_call ();
          uiout->field_string ("func", "<function called from gdb>",
			       function_name_style.style ());
	}
      else if (get_frame_type (frame) == SIGTRAMP_FRAME)
        {
	  annotate_signal_handler_caller ();
          uiout->field_string ("func", "<signal handler called>",
			       function_name_style.style ());
        }
      else if (get_frame_type (frame) == ARCH_FRAME)
        {
          uiout->field_string ("func", "<cross-architecture call>",
			       function_name_style.style ());
	}
      uiout->text ("\n");
      annotate_frame_end ();

      /* If disassemble-next-line is set to auto or on output the next
	 instruction.  */
      if (disassemble_next_line == AUTO_BOOLEAN_AUTO
	  || disassemble_next_line == AUTO_BOOLEAN_TRUE)
	do_gdb_disassembly (get_frame_arch (frame), 1,
			    get_frame_pc (frame), get_frame_pc (frame) + 1);

      return;
    }

  /* If FRAME is not the innermost frame, that normally means that
     FRAME->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 SIGTRAMP_FRAME 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 FRAME->pc.  */
  symtab_and_line sal = find_frame_sal (frame);

  location_print = (print_what == LOCATION
		    || print_what == SRC_AND_LOC
		    || print_what == LOC_AND_ADDRESS
		    || print_what == SHORT_LOCATION);
  if (location_print || !sal.symtab)
    print_frame (fp_opts, frame, print_level, print_what, print_args, sal);

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

  /* If disassemble-next-line is set to auto or on and doesn't have
     the line debug messages for $pc, output the next instruction.  */
  if ((disassemble_next_line == AUTO_BOOLEAN_AUTO
       || disassemble_next_line == AUTO_BOOLEAN_TRUE)
      && source_print && !sal.symtab)
    do_gdb_disassembly (get_frame_arch (frame), 1,
			get_frame_pc (frame), get_frame_pc (frame) + 1);

  if (source_print && sal.symtab)
    {
      int mid_statement = ((print_what == SRC_LINE)
			   && frame_show_address (frame, sal));
      annotate_source_line (sal.symtab, sal.line, mid_statement,
			    get_frame_pc (frame));

      if (deprecated_print_frame_info_listing_hook)
	deprecated_print_frame_info_listing_hook (sal.symtab, sal.line,
						  sal.line + 1, 0);
      else
	{
	  struct value_print_options opts;

	  get_user_print_options (&opts);
	  /* 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 (opts.addressprint && mid_statement)
	    {
	      print_pc (uiout, gdbarch, frame, get_frame_pc (frame));
	      uiout->text ("\t");
	    }

	  print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
	}
    }

  /* If disassemble-next-line is set to on and there is line debug
     messages, output assembly codes for next line.  */
  if (disassemble_next_line == AUTO_BOOLEAN_TRUE)
    do_gdb_disassembly (get_frame_arch (frame), -1, sal.pc, sal.end);

  if (set_current_sal)
    {
      CORE_ADDR pc;

      if (get_frame_pc_if_available (frame, &pc))
	set_last_displayed_sal (1, sal.pspace, pc, sal.symtab, sal.line);
      else
	set_last_displayed_sal (0, 0, 0, 0, 0);
    }

  annotate_frame_end ();

  gdb_flush (gdb_stdout);
}

/* Remember the last symtab and line we displayed, which we use e.g.
 * as the place to put a breakpoint when the `break' command is
 * invoked with no arguments.  */

static void
set_last_displayed_sal (int valid, struct program_space *pspace,
			CORE_ADDR addr, struct symtab *symtab,
			int line)
{
  last_displayed_sal_valid = valid;
  last_displayed_pspace = pspace;
  last_displayed_addr = addr;
  last_displayed_symtab = symtab;
  last_displayed_line = line;
  if (valid && pspace == NULL)
    {
      clear_last_displayed_sal ();
      internal_error (__FILE__, __LINE__,
		      _("Trying to set NULL pspace."));
    }
}

/* Forget the last sal we displayed.  */

void
clear_last_displayed_sal (void)
{
  last_displayed_sal_valid = 0;
  last_displayed_pspace = 0;
  last_displayed_addr = 0;
  last_displayed_symtab = 0;
  last_displayed_line = 0;
}

/* Is our record of the last sal we displayed valid?  If not,
 * the get_last_displayed_* functions will return NULL or 0, as
 * appropriate.  */

int
last_displayed_sal_is_valid (void)
{
  return last_displayed_sal_valid;
}

/* Get the pspace of the last sal we displayed, if it's valid.  */

struct program_space *
get_last_displayed_pspace (void)
{
  if (last_displayed_sal_valid)
    return last_displayed_pspace;
  return 0;
}

/* Get the address of the last sal we displayed, if it's valid.  */

CORE_ADDR
get_last_displayed_addr (void)
{
  if (last_displayed_sal_valid)
    return last_displayed_addr;
  return 0;
}

/* Get the symtab of the last sal we displayed, if it's valid.  */

struct symtab*
get_last_displayed_symtab (void)
{
  if (last_displayed_sal_valid)
    return last_displayed_symtab;
  return 0;
}

/* Get the line of the last sal we displayed, if it's valid.  */

int
get_last_displayed_line (void)
{
  if (last_displayed_sal_valid)
    return last_displayed_line;
  return 0;
}

/* Get the last sal we displayed, if it's valid.  */

symtab_and_line
get_last_displayed_sal ()
{
  symtab_and_line sal;

  if (last_displayed_sal_valid)
    {
      sal.pspace = last_displayed_pspace;
      sal.pc = last_displayed_addr;
      sal.symtab = last_displayed_symtab;
      sal.line = last_displayed_line;
    }

  return sal;
}


/* Attempt to obtain the name, FUNLANG and optionally FUNCP of the function
   corresponding to FRAME.  */

gdb::unique_xmalloc_ptr<char>
find_frame_funname (struct frame_info *frame, enum language *funlang,
		    struct symbol **funcp)
{
  struct symbol *func;
  gdb::unique_xmalloc_ptr<char> funname;

  *funlang = language_unknown;
  if (funcp)
    *funcp = NULL;

  func = get_frame_function (frame);
  if (func)
    {
      const char *print_name = SYMBOL_PRINT_NAME (func);

      *funlang = SYMBOL_LANGUAGE (func);
      if (funcp)
	*funcp = func;
      if (*funlang == language_cplus)
	{
	  /* It seems appropriate to use SYMBOL_PRINT_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 remove the parameters.  */
	  funname = cp_remove_params (print_name);
	}

      /* If we didn't hit the C++ case above, set *funname
	 here.  */
      if (funname == NULL)
	funname.reset (xstrdup (print_name));
    }
  else
    {
      struct bound_minimal_symbol msymbol;
      CORE_ADDR pc;

      if (!get_frame_address_in_block_if_available (frame, &pc))
	return funname;

      msymbol = lookup_minimal_symbol_by_pc (pc);
      if (msymbol.minsym != NULL)
	{
	  funname.reset (xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym)));
	  *funlang = MSYMBOL_LANGUAGE (msymbol.minsym);
	}
    }

  return funname;
}

static void
print_frame (const frame_print_options &fp_opts,
	     frame_info *frame, int print_level,
	     enum print_what print_what, int print_args,
	     struct symtab_and_line sal)
{
  struct gdbarch *gdbarch = get_frame_arch (frame);
  struct ui_out *uiout = current_uiout;
  enum language funlang = language_unknown;
  struct value_print_options opts;
  struct symbol *func;
  CORE_ADDR pc = 0;
  int pc_p;

  pc_p = get_frame_pc_if_available (frame, &pc);

  gdb::unique_xmalloc_ptr<char> funname
    = find_frame_funname (frame, &funlang, &func);

  annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
			gdbarch, pc);

  {
    ui_out_emit_tuple tuple_emitter (uiout, "frame");

    if (print_level)
      {
	uiout->text ("#");
	uiout->field_fmt_signed (2, ui_left, "level",
				 frame_relative_level (frame));
      }
    get_user_print_options (&opts);
    if (opts.addressprint)
      if (!sal.symtab
	  || frame_show_address (frame, sal)
	  || print_what == LOC_AND_ADDRESS)
	{
	  annotate_frame_address ();
	  if (pc_p)
	    print_pc (uiout, gdbarch, frame, pc);
	  else
	    uiout->field_string ("addr", "<unavailable>",
				 address_style.style ());
	  annotate_frame_address_end ();
	  uiout->text (" in ");
	}
    annotate_frame_function_name ();

    string_file stb;
    fprintf_symbol_filtered (&stb, funname ? funname.get () : "??",
			     funlang, DMGL_ANSI);
    uiout->field_stream ("func", stb, function_name_style.style ());
    uiout->wrap_hint ("   ");
    annotate_frame_args ();

    uiout->text (" (");
    if (print_args)
      {
	int numargs;

	if (gdbarch_frame_num_args_p (gdbarch))
	  {
	    numargs = gdbarch_frame_num_args (gdbarch, frame);
	    gdb_assert (numargs >= 0);
	  }
	else
	  numargs = -1;
    
	{
	  ui_out_emit_list list_emitter (uiout, "args");
	  try
	    {
	      print_frame_args (fp_opts, func, frame, numargs, gdb_stdout);
	    }
	  catch (const gdb_exception_error &e)
	    {
	    }

	    /* FIXME: ARGS must be a list.  If one argument is a string it
	       will have " that will not be properly escaped.  */
	    }
	QUIT;
      }
    uiout->text (")");
    if (print_what != SHORT_LOCATION && sal.symtab)
      {
	const char *filename_display;
      
	filename_display = symtab_to_filename_for_display (sal.symtab);
	annotate_frame_source_begin ();
	uiout->wrap_hint ("   ");
	uiout->text (" at ");
	annotate_frame_source_file ();
	uiout->field_string ("file", filename_display,
			     file_name_style.style ());
	if (uiout->is_mi_like_p ())
	  {
	    const char *fullname = symtab_to_fullname (sal.symtab);

	    uiout->field_string ("fullname", fullname);
	  }
	annotate_frame_source_file_end ();
	uiout->text (":");
	annotate_frame_source_line ();
	uiout->field_signed ("line", sal.line);
	annotate_frame_source_end ();
      }

    if (print_what != SHORT_LOCATION
	&& pc_p && (funname == NULL || sal.symtab == NULL))
      {
	char *lib = solib_name_from_address (get_frame_program_space (frame),
					     get_frame_pc (frame));

	if (lib)
	  {
	    annotate_frame_where ();
	    uiout->wrap_hint ("  ");
	    uiout->text (" from ");
	    uiout->field_string ("from", lib);
	  }
      }
    if (uiout->is_mi_like_p ())
      uiout->field_string ("arch",
			   (gdbarch_bfd_arch_info (gdbarch))->printable_name);
  }

  uiout->text ("\n");
}


/* Completion function for "frame function", "info frame function", and
   "select-frame function" commands.  */

void
frame_selection_by_function_completer (struct cmd_list_element *ignore,
				       completion_tracker &tracker,
				       const char *text, const char *word)
{
  /* This is used to complete function names within a stack.  It would be
     nice if we only offered functions that were actually in the stack.
     However, this would mean unwinding the stack to completion, which
     could take too long, or on a corrupted stack, possibly not end.
     Instead, we offer all symbol names as a safer choice.  */
  collect_symbol_completion_matches (tracker,
				     complete_symbol_mode::EXPRESSION,
				     symbol_name_match_type::EXPRESSION,
				     text, word);
}

/* Core of all the "info frame" sub-commands.  Print information about a
   frame FI.  If SELECTED_FRAME_P is true then the user didn't provide a
   frame specification, they just entered 'info frame'.  If the user did
   provide a frame specification (for example 'info frame 0', 'info frame
   level 1') then SELECTED_FRAME_P will be false.  */

static void
info_frame_command_core (struct frame_info *fi, bool selected_frame_p)
{
  struct symbol *func;
  struct symtab *s;
  struct frame_info *calling_frame_info;
  int numregs;
  const char *funname = 0;
  enum language funlang = language_unknown;
  const char *pc_regname;
  struct gdbarch *gdbarch;
  CORE_ADDR frame_pc;
  int frame_pc_p;
  /* Initialize it to avoid "may be used uninitialized" warning.  */
  CORE_ADDR caller_pc = 0;
  int caller_pc_p = 0;

  gdbarch = get_frame_arch (fi);

  /* Name of the value returned by get_frame_pc().  Per comments, "pc"
     is not a good name.  */
  if (gdbarch_pc_regnum (gdbarch) >= 0)
    /* OK, this is weird.  The gdbarch_pc_regnum hardware register's value can
       easily not match that of the internal value returned by
       get_frame_pc().  */
    pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch));
  else
    /* But then, this is weird to.  Even without gdbarch_pc_regnum, an
       architectures will often have a hardware register called "pc",
       and that register's value, again, can easily not match
       get_frame_pc().  */
    pc_regname = "pc";

  frame_pc_p = get_frame_pc_if_available (fi, &frame_pc);
  func = get_frame_function (fi);
  symtab_and_line sal = find_frame_sal (fi);
  s = sal.symtab;
  gdb::unique_xmalloc_ptr<char> func_only;
  if (func)
    {
      funname = SYMBOL_PRINT_NAME (func);
      funlang = SYMBOL_LANGUAGE (func);
      if (funlang == language_cplus)
	{
	  /* It seems appropriate to use SYMBOL_PRINT_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 remove the parameters.  */
	  func_only = cp_remove_params (funname);

	  if (func_only)
	    funname = func_only.get ();
	}
    }
  else if (frame_pc_p)
    {
      struct bound_minimal_symbol msymbol;

      msymbol = lookup_minimal_symbol_by_pc (frame_pc);
      if (msymbol.minsym != NULL)
	{
	  funname = MSYMBOL_PRINT_NAME (msymbol.minsym);
	  funlang = MSYMBOL_LANGUAGE (msymbol.minsym);
	}
    }
  calling_frame_info = get_prev_frame (fi);

  if (selected_frame_p && frame_relative_level (fi) >= 0)
    {
      printf_filtered (_("Stack level %d, frame at "),
		       frame_relative_level (fi));
    }
  else
    {
      printf_filtered (_("Stack frame at "));
    }
  fputs_filtered (paddress (gdbarch, get_frame_base (fi)), gdb_stdout);
  printf_filtered (":\n");
  printf_filtered (" %s = ", pc_regname);
  if (frame_pc_p)
    fputs_filtered (paddress (gdbarch, get_frame_pc (fi)), gdb_stdout);
  else
    fputs_filtered ("<unavailable>", 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)", symtab_to_filename_for_display (sal.symtab),
		     sal.line);
  puts_filtered ("; ");
  wrap_here ("    ");
  printf_filtered ("saved %s = ", pc_regname);

  if (!frame_id_p (frame_unwind_caller_id (fi)))
    val_print_not_saved (gdb_stdout);
  else
    {
      try
	{
	  caller_pc = frame_unwind_caller_pc (fi);
	  caller_pc_p = 1;
	}
      catch (const gdb_exception_error &ex)
	{
	  switch (ex.error)
	    {
	    case NOT_AVAILABLE_ERROR:
	      val_print_unavailable (gdb_stdout);
	      break;
	    case OPTIMIZED_OUT_ERROR:
	      val_print_not_saved (gdb_stdout);
	      break;
	    default:
	      fprintf_filtered (gdb_stdout, _("<error: %s>"),
				ex.what ());
	      break;
	    }
	}
    }

  if (caller_pc_p)
    fputs_filtered (paddress (gdbarch, caller_pc), gdb_stdout);
  printf_filtered ("\n");

  if (calling_frame_info == NULL)
    {
      enum unwind_stop_reason reason;

      reason = get_frame_unwind_stop_reason (fi);
      if (reason != UNWIND_NO_REASON)
	printf_filtered (_(" Outermost frame: %s\n"),
			 frame_stop_reason_string (fi));
    }
  else if (get_frame_type (fi) == TAILCALL_FRAME)
    puts_filtered (" tail call frame");
  else if (get_frame_type (fi) == INLINE_FRAME)
    printf_filtered (" inlined into frame %d",
		     frame_relative_level (get_prev_frame (fi)));
  else
    {
      printf_filtered (" called by frame at ");
      fputs_filtered (paddress (gdbarch, get_frame_base (calling_frame_info)),
		      gdb_stdout);
    }
  if (get_next_frame (fi) && calling_frame_info)
    puts_filtered (",");
  wrap_here ("   ");
  if (get_next_frame (fi))
    {
      printf_filtered (" caller of frame at ");
      fputs_filtered (paddress (gdbarch, get_frame_base (get_next_frame (fi))),
		      gdb_stdout);
    }
  if (get_next_frame (fi) || calling_frame_info)
    puts_filtered ("\n");

  if (s)
    printf_filtered (" source language %s.\n",
		     language_str (s->language));

  {
    /* Address of the argument list for this frame, or 0.  */
    CORE_ADDR arg_list = get_frame_args_address (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 ");
	fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout);
	printf_filtered (",");

	if (!gdbarch_frame_num_args_p (gdbarch))
	  {
	    numargs = -1;
	    puts_filtered (" args: ");
	  }
	else
	  {
	    numargs = gdbarch_frame_num_args (gdbarch, fi);
	    gdb_assert (numargs >= 0);
	    if (numargs == 0)
	      puts_filtered (" no args.");
	    else if (numargs == 1)
	      puts_filtered (" 1 arg: ");
	    else
	      printf_filtered (" %d args: ", numargs);
	  }
	print_frame_args (user_frame_print_options,
			  func, fi, numargs, gdb_stdout);
	puts_filtered ("\n");
      }
  }
  {
    /* Address of the local variables for this frame, or 0.  */
    CORE_ADDR arg_list = get_frame_locals_address (fi);

    if (arg_list == 0)
      printf_filtered (" Locals at unknown address,");
    else
      {
	printf_filtered (" Locals at ");
	fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout);
	printf_filtered (",");
      }
  }

  /* Print as much information as possible on the location of all the
     registers.  */
  {
    int count;
    int i;
    int need_nl = 1;
    int sp_regnum = gdbarch_sp_regnum (gdbarch);

    /* The sp is special; what's displayed isn't the save address, but
       the value of the previous frame's sp.  This is a legacy thing,
       at one stage the frame cached the previous frame's SP instead
       of its address, hence it was easiest to just display the cached
       value.  */
    if (sp_regnum >= 0)
      {
	struct value *value = frame_unwind_register_value (fi, sp_regnum);
	gdb_assert (value != NULL);

	if (!value_optimized_out (value) && value_entirely_available (value))
	  {
	    if (VALUE_LVAL (value) == not_lval)
	      {
		CORE_ADDR sp;
		enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
		int sp_size = register_size (gdbarch, sp_regnum);

		sp = extract_unsigned_integer (value_contents_all (value),
					       sp_size, byte_order);

		printf_filtered (" Previous frame's sp is ");
		fputs_filtered (paddress (gdbarch, sp), gdb_stdout);
		printf_filtered ("\n");
	      }
	    else if (VALUE_LVAL (value) == lval_memory)
	      {
		printf_filtered (" Previous frame's sp at ");
		fputs_filtered (paddress (gdbarch, value_address (value)),
				gdb_stdout);
		printf_filtered ("\n");
	      }
	    else if (VALUE_LVAL (value) == lval_register)
	      {
		printf_filtered (" Previous frame's sp in %s\n",
				 gdbarch_register_name (gdbarch,
							VALUE_REGNUM (value)));
	      }

	    release_value (value);
	    need_nl = 0;
	  }
	/* else keep quiet.  */
      }

    count = 0;
    numregs = gdbarch_num_cooked_regs (gdbarch);
    for (i = 0; i < numregs; i++)
      if (i != sp_regnum
	  && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup))
	{
	  enum lval_type lval;
	  int optimized;
	  int unavailable;
	  CORE_ADDR addr;
	  int realnum;

	  /* Find out the location of the saved register without
             fetching the corresponding value.  */
	  frame_register_unwind (fi, i, &optimized, &unavailable,
				 &lval, &addr, &realnum, NULL);
	  /* For moment, only display registers that were saved on the
	     stack.  */
	  if (!optimized && !unavailable && lval == lval_memory)
	    {
	      if (count == 0)
		puts_filtered (" Saved registers:\n ");
	      else
		puts_filtered (",");
	      wrap_here (" ");
	      printf_filtered (" %s at ",
			       gdbarch_register_name (gdbarch, i));
	      fputs_filtered (paddress (gdbarch, addr), gdb_stdout);
	      count++;
	    }
	}
    if (count || need_nl)
      puts_filtered ("\n");
  }
}

/* Return the innermost frame at level LEVEL.  */

static struct frame_info *
leading_innermost_frame (int level)
{
  struct frame_info *leading;

  leading = get_current_frame ();

  gdb_assert (level >= 0);

  while (leading != nullptr && level)
    {
      QUIT;
      leading = get_prev_frame (leading);
      level--;
    }

  return leading;
}

/* Return the starting frame needed to handle COUNT outermost frames.  */

static struct frame_info *
trailing_outermost_frame (int count)
{
  struct frame_info *current;
  struct frame_info *trailing;

  trailing = get_current_frame ();

  gdb_assert (count > 0);

  current = trailing;
  while (current != nullptr && 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 != nullptr)
    {
      QUIT;
      trailing = get_prev_frame (trailing);
      current = get_prev_frame (current);
    }

  return trailing;
}

/* The core of all the "select-frame" sub-commands.  Just wraps a call to
   SELECT_FRAME.  */

static void
select_frame_command_core (struct frame_info *fi, bool ignored)
{
  struct frame_info *prev_frame = get_selected_frame_if_set ();
  select_frame (fi);
  if (get_selected_frame_if_set () != prev_frame)
    gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME);
}

/* See stack.h.  */

void
select_frame_for_mi (struct frame_info *fi)
{
  select_frame_command_core (fi, false /* Ignored.  */);
}

/* The core of all the "frame" sub-commands.  Select frame FI, and if this
   means we change frame send out a change notification (otherwise, just
   reprint the current frame summary).   */

static void
frame_command_core (struct frame_info *fi, bool ignored)
{
  struct frame_info *prev_frame = get_selected_frame_if_set ();

  select_frame (fi);
  if (get_selected_frame_if_set () != prev_frame)
    gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME);
  else
    print_selected_thread_frame (current_uiout, USER_SELECTED_FRAME);
}

/* The three commands 'frame', 'select-frame', and 'info frame' all have a
   common set of sub-commands that allow a specific frame to be selected.
   All of the sub-command functions are static methods within this class
   template which is then instantiated below.  The template parameter is a
   callback used to implement the functionality of the base command
   ('frame', 'select-frame', or 'info frame').

   In the template parameter FI is the frame being selected.  The
   SELECTED_FRAME_P flag is true if the frame being selected was done by
   default, which happens when the user uses the base command with no
   arguments.  For example the commands 'info frame', 'select-frame',
   'frame' will all cause SELECTED_FRAME_P to be true.  In all other cases
   SELECTED_FRAME_P is false.  */

template <void (*FPTR) (struct frame_info *fi, bool selected_frame_p)>
class frame_command_helper
{
public:

  /* The "frame level" family of commands.  The ARG is an integer that is
     the frame's level in the stack.  */
  static void
  level (const char *arg, int from_tty)
  {
    int level = value_as_long (parse_and_eval (arg));
    struct frame_info *fid
      = find_relative_frame (get_current_frame (), &level);
    if (level != 0)
      error (_("No frame at level %s."), arg);
    FPTR (fid, false);
  }

  /* The "frame address" family of commands.  ARG is a stack-pointer
     address for an existing frame.  This command does not allow new
     frames to be created.  */

  static void
  address (const char *arg, int from_tty)
  {
    CORE_ADDR addr = value_as_address (parse_and_eval (arg));
    struct frame_info *fid = find_frame_for_address (addr);
    if (fid == NULL)
      error (_("No frame at address %s."), arg);
    FPTR (fid, false);
  }

  /* The "frame view" family of commands.  ARG is one or two addresses and
     is used to view a frame that might be outside the current backtrace.
     The addresses are stack-pointer address, and (optional) pc-address.  */

  static void
  view (const char *args, int from_tty)
  {
    struct frame_info *fid;

    if (args == NULL)
    error (_("Missing address argument to view a frame"));

    gdb_argv argv (args);

    if (argv.count () == 2)
      {
	CORE_ADDR addr[2];

	addr [0] = value_as_address (parse_and_eval (argv[0]));
	addr [1] = value_as_address (parse_and_eval (argv[1]));
	fid = create_new_frame (addr[0], addr[1]);
      }
    else
      {
	CORE_ADDR addr = value_as_address (parse_and_eval (argv[0]));
	fid = create_new_frame (addr, false);
      }
    FPTR (fid, false);
  }

  /* The "frame function" family of commands.  ARG is the name of a
     function within the stack, the first function (searching from frame
     0) with that name will be selected.  */

  static void
  function (const char *arg, int from_tty)
  {
    if (arg == NULL)
      error (_("Missing function name argument"));
    struct frame_info *fid = find_frame_for_function (arg);
    if (fid == NULL)
      error (_("No frame for function \"%s\"."), arg);
    FPTR (fid, false);
  }

  /* The "frame" base command, that is, when no sub-command is specified.
     If one argument is provided then we assume that this is a frame's
     level as historically, this was the supported command syntax that was
     used most often.

     If no argument is provided, then the current frame is selected.  */

  static void
  base_command (const char *arg, int from_tty)
  {
    if (arg == NULL)
      FPTR (get_selected_frame (_("No stack.")), true);
    else
      level (arg, from_tty);
  }
};

/* Instantiate three FRAME_COMMAND_HELPER instances to implement the
   sub-commands for 'info frame', 'frame', and 'select-frame' commands.  */

static frame_command_helper <info_frame_command_core> info_frame_cmd;
static frame_command_helper <frame_command_core> frame_cmd;
static frame_command_helper <select_frame_command_core> select_frame_cmd;

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

static void
backtrace_command_1 (const frame_print_options &fp_opts,
		     const backtrace_cmd_options &bt_opts,
		     const char *count_exp, int from_tty)

{
  struct frame_info *fi;
  int count;
  int py_start = 0, py_end = 0;
  enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;

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

  if (count_exp)
    {
      count = parse_and_eval_long (count_exp);
      if (count < 0)
	py_start = count;
      else
	{
	  py_start = 0;
	  /* The argument to apply_ext_lang_frame_filter is the number
	     of the final frame to print, and frames start at 0.  */
	  py_end = count - 1;
	}
    }
  else
    {
      py_end = -1;
      count = -1;
    }

  frame_filter_flags flags = 0;

  if (bt_opts.full)
    flags |= PRINT_LOCALS;
  if (bt_opts.hide)
    flags |= PRINT_HIDE;

  if (!bt_opts.no_filters)
    {
      enum ext_lang_frame_args arg_type;

      flags |= PRINT_LEVEL | PRINT_FRAME_INFO | PRINT_ARGS;
      if (from_tty)
	flags |= PRINT_MORE_FRAMES;

      if (fp_opts.print_frame_arguments == print_frame_arguments_scalars)
	arg_type = CLI_SCALAR_VALUES;
      else if (fp_opts.print_frame_arguments == print_frame_arguments_all)
	arg_type = CLI_ALL_VALUES;
      else if (fp_opts.print_frame_arguments == print_frame_arguments_presence)
	arg_type = CLI_PRESENCE;
      else if (fp_opts.print_frame_arguments == print_frame_arguments_none)
	arg_type = NO_VALUES;
      else
	gdb_assert (0);

      result = apply_ext_lang_frame_filter (get_current_frame (), flags,
					    arg_type, current_uiout,
					    py_start, py_end);
    }

  /* Run the inbuilt backtrace if there are no filters registered, or
     "-no-filters" has been specified from the command.  */
  if (bt_opts.no_filters || result == EXT_LANG_BT_NO_FILTERS)
    {
      struct frame_info *trailing;

      /* 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.  */

      if (count_exp != NULL && count < 0)
	{
	  trailing = trailing_outermost_frame (-count);
	  count = -1;
	}
      else
	trailing = get_current_frame ();

      for (fi = trailing; fi && count--; 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 (fp_opts, fi, 1, LOCATION, 1, 0);
	  if ((flags & PRINT_LOCALS) != 0)
	    {
	      struct frame_id frame_id = get_frame_id (fi);

	      print_frame_local_vars (fi, false, NULL, NULL, 1, gdb_stdout);

	      /* print_frame_local_vars invalidates FI.  */
	      fi = frame_find_by_id (frame_id);
	      if (fi == NULL)
		{
		  trailing = NULL;
		  warning (_("Unable to restore previously selected frame."));
		  break;
		}
	    }

	  /* Save the last frame to check for error conditions.  */
	  trailing = fi;
	}

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

      /* If we've run out of frames, and the reason appears to be an error
	 condition, print it.  */
      if (fi == NULL && trailing != NULL)
	{
	  enum unwind_stop_reason reason;

	  reason = get_frame_unwind_stop_reason (trailing);
	  if (reason >= UNWIND_FIRST_ERROR)
	    printf_filtered (_("Backtrace stopped: %s\n"),
			     frame_stop_reason_string (trailing));
	}
    }
}

/* Create an option_def_group array grouping all the "backtrace"
   options, with FP_OPTS, BT_CMD_OPT, SET_BT_OPTS as contexts.  */

static inline std::array<gdb::option::option_def_group, 3>
make_backtrace_options_def_group (frame_print_options *fp_opts,
				  backtrace_cmd_options *bt_cmd_opts,
				  set_backtrace_options *set_bt_opts)
{
  return {{
    { {frame_print_option_defs}, fp_opts },
    { {set_backtrace_option_defs}, set_bt_opts },
    { {backtrace_command_option_defs}, bt_cmd_opts }
  }};
}

/* Parse the backtrace command's qualifiers.  Returns ARG advanced
   past the qualifiers, if any.  BT_CMD_OPTS, if not null, is used to
   store the parsed qualifiers.  */

static const char *
parse_backtrace_qualifiers (const char *arg,
			    backtrace_cmd_options *bt_cmd_opts = nullptr)
{
  while (true)
    {
      const char *save_arg = arg;
      std::string this_arg = extract_arg (&arg);

      if (this_arg.empty ())
	return arg;

      if (subset_compare (this_arg.c_str (), "no-filters"))
	{
	  if (bt_cmd_opts != nullptr)
	    bt_cmd_opts->no_filters = true;
	}
      else if (subset_compare (this_arg.c_str (), "full"))
	{
	  if (bt_cmd_opts != nullptr)
	    bt_cmd_opts->full = true;
	}
      else if (subset_compare (this_arg.c_str (), "hide"))
	{
	  if (bt_cmd_opts != nullptr)
	    bt_cmd_opts->hide = true;
	}
      else
	{
	  /* Not a recognized qualifier, so stop.  */
	  return save_arg;
	}
    }
}

static void
backtrace_command (const char *arg, int from_tty)
{
  frame_print_options fp_opts = user_frame_print_options;
  backtrace_cmd_options bt_cmd_opts;
  set_backtrace_options set_bt_opts = user_set_backtrace_options;

  auto grp
    = make_backtrace_options_def_group (&fp_opts, &bt_cmd_opts, &set_bt_opts);
  gdb::option::process_options
    (&arg, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, grp);

  /* Parse non-'-'-prefixed qualifiers, for backwards
     compatibility.  */
  if (arg != NULL)
    {
      arg = parse_backtrace_qualifiers (arg, &bt_cmd_opts);
      if (*arg == '\0')
	arg = NULL;
    }

  /* These options are handled quite deep in the unwind machinery, so
     we get to pass them down by swapping globals.  */
  scoped_restore restore_set_backtrace_options
    = make_scoped_restore (&user_set_backtrace_options, set_bt_opts);

  backtrace_command_1 (fp_opts, bt_cmd_opts, arg, from_tty);
}

/* Completer for the "backtrace" command.  */

static void
backtrace_command_completer (struct cmd_list_element *ignore,
			     completion_tracker &tracker,
			     const char *text, const char */*word*/)
{
  const auto group
    = make_backtrace_options_def_group (nullptr, nullptr, nullptr);
  if (gdb::option::complete_options
      (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group))
    return;

  if (*text != '\0')
    {
      const char *p = skip_to_space (text);
      if (*p == '\0')
	{
	  static const char *const backtrace_cmd_qualifier_choices[] = {
	    "full", "no-filters", "hide", nullptr,
	  };
	  complete_on_enum (tracker, backtrace_cmd_qualifier_choices,
			    text, text);

	  if (tracker.have_completions ())
	    return;
	}
      else
	{
	  const char *cmd = parse_backtrace_qualifiers (text);
	  tracker.advance_custom_word_point_by (cmd - text);
	  text = cmd;
	}
    }

  const char *word = advance_to_expression_complete_word_point (tracker, text);
  expression_completer (ignore, tracker, text, word);
}

/* Iterate over the local variables of a block B, calling CB with
   CB_DATA.  */

static void
iterate_over_block_locals (const struct block *b,
			   iterate_over_block_arg_local_vars_cb cb,
			   void *cb_data)
{
  struct block_iterator iter;
  struct symbol *sym;

  ALL_BLOCK_SYMBOLS (b, iter, sym)
    {
      switch (SYMBOL_CLASS (sym))
	{
	case LOC_LOCAL:
	case LOC_REGISTER:
	case LOC_STATIC:
	case LOC_COMPUTED:
	case LOC_OPTIMIZED_OUT:
	  if (SYMBOL_IS_ARGUMENT (sym))
	    break;
	  if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
	    break;
	  (*cb) (SYMBOL_PRINT_NAME (sym), sym, cb_data);
	  break;

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


/* Same, but print labels.  */

#if 0
/* Commented out, as the code using this function has also been
   commented out.  FIXME:brobecker/2009-01-13: Find out why the code
   was commented out in the first place.  The discussion introducing
   this change (2007-12-04: Support lexical blocks and function bodies
   that occupy non-contiguous address ranges) did not explain why
   this change was made.  */
static int
print_block_frame_labels (struct gdbarch *gdbarch, struct block *b,
			  int *have_default, struct ui_file *stream)
{
  struct block_iterator iter;
  struct symbol *sym;
  int values_printed = 0;

  ALL_BLOCK_SYMBOLS (b, iter, sym)
    {
      if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0)
	{
	  if (*have_default)
	    continue;
	  *have_default = 1;
	}
      if (SYMBOL_CLASS (sym) == LOC_LABEL)
	{
	  struct symtab_and_line sal;
	  struct value_print_options opts;

	  sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
	  values_printed = 1;
	  fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
	  get_user_print_options (&opts);
	  if (opts.addressprint)
	    {
	      fprintf_filtered (stream, " ");
	      fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (sym)),
			      stream);
	    }
	  fprintf_filtered (stream, " in file %s, line %d\n",
			    sal.symtab->filename, sal.line);
	}
    }

  return values_printed;
}
#endif

/* Iterate over all the local variables in block B, including all its
   superblocks, stopping when the top-level block is reached.  */

void
iterate_over_block_local_vars (const struct block *block,
			       iterate_over_block_arg_local_vars_cb cb,
			       void *cb_data)
{
  while (block)
    {
      iterate_over_block_locals (block, cb, cb_data);
      /* 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);
    }
}

/* Data to be passed around in the calls to the locals and args
   iterators.  */

struct print_variable_and_value_data
{
  gdb::optional<compiled_regex> preg;
  gdb::optional<compiled_regex> treg;
  struct frame_id frame_id;
  int num_tabs;
  struct ui_file *stream;
  int values_printed;
};

/* The callback for the locals and args iterators.  */

static void
do_print_variable_and_value (const char *print_name,
			     struct symbol *sym,
			     void *cb_data)
{
  struct print_variable_and_value_data *p
    = (struct print_variable_and_value_data *) cb_data;
  struct frame_info *frame;

  if (p->preg.has_value ()
      && p->preg->exec (SYMBOL_NATURAL_NAME (sym), 0,
			NULL, 0) != 0)
    return;
  if (p->treg.has_value ()
      && !treg_matches_sym_type_name (*p->treg, sym))
    return;

  frame = frame_find_by_id (p->frame_id);
  if (frame == NULL)
    {
      warning (_("Unable to restore previously selected frame."));
      return;
    }

  print_variable_and_value (print_name, sym, frame, p->stream, p->num_tabs);

  /* print_variable_and_value invalidates FRAME.  */
  frame = NULL;

  p->values_printed = 1;
}

/* Prepares the regular expression REG from REGEXP.
   If REGEXP is NULL, it results in an empty regular expression.  */

static void
prepare_reg (const char *regexp, gdb::optional<compiled_regex> *reg)
{
  if (regexp != NULL)
    {
      int cflags = REG_NOSUB | (case_sensitivity == case_sensitive_off
				? REG_ICASE : 0);
      reg->emplace (regexp, cflags, _("Invalid regexp"));
    }
  else
    reg->reset ();
}

/* Print all variables from the innermost up to the function block of FRAME.
   Print them with values to STREAM indented by NUM_TABS.
   If REGEXP is not NULL, only print local variables whose name
   matches REGEXP.
   If T_REGEXP is not NULL, only print local variables whose type
   matches T_REGEXP.
   If no local variables have been printed and !QUIET, prints a message
   explaining why no local variables could be printed.

   This function will invalidate FRAME.  */

static void
print_frame_local_vars (struct frame_info *frame,
			bool quiet,
			const char *regexp, const char *t_regexp,
			int num_tabs, struct ui_file *stream)
{
  struct print_variable_and_value_data cb_data;
  const struct block *block;
  CORE_ADDR pc;

  if (!get_frame_pc_if_available (frame, &pc))
    {
      if (!quiet)
	fprintf_filtered (stream,
			  _("PC unavailable, cannot determine locals.\n"));
      return;
    }

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

  prepare_reg (regexp, &cb_data.preg);
  prepare_reg (t_regexp, &cb_data.treg);
  cb_data.frame_id = get_frame_id (frame);
  cb_data.num_tabs = 4 * num_tabs;
  cb_data.stream = stream;
  cb_data.values_printed = 0;

  /* Temporarily change the selected frame to the given FRAME.
     This allows routines that rely on the selected frame instead
     of being given a frame as parameter to use the correct frame.  */
  scoped_restore_selected_frame restore_selected_frame;
  select_frame (frame);

  iterate_over_block_local_vars (block,
				 do_print_variable_and_value,
				 &cb_data);

  if (!cb_data.values_printed && !quiet)
    {
      if (regexp == NULL && t_regexp == NULL)
	fprintf_filtered (stream, _("No locals.\n"));
      else
	fprintf_filtered (stream, _("No matching locals.\n"));
    }
}

/* Structure to hold the values of the options used by the 'info
   variables' command and other similar commands.  These correspond to the
   -q and -t options.  */

struct info_print_options
{
  bool quiet = false;
  char *type_regexp = nullptr;

  ~info_print_options ()
  {
    xfree (type_regexp);
  }
};

/* The options used by the 'info locals' and 'info args' commands.  */

static const gdb::option::option_def info_print_options_defs[] = {
  gdb::option::boolean_option_def<info_print_options> {
    "q",
    [] (info_print_options *opt) { return &opt->quiet; },
    nullptr, /* show_cmd_cb */
    nullptr /* set_doc */
  },

  gdb::option::string_option_def<info_print_options> {
    "t",
    [] (info_print_options *opt) { return &opt->type_regexp; },
    nullptr, /* show_cmd_cb */
    nullptr /* set_doc */
  }
};

/* Returns the option group used by 'info locals' and 'info args'
   commands.  */

static gdb::option::option_def_group
make_info_print_options_def_group (info_print_options *opts)
{
  return {{info_print_options_defs}, opts};
}

/* Command completer for 'info locals' and 'info args'.  */

static void
info_print_command_completer (struct cmd_list_element *ignore,
			      completion_tracker &tracker,
			      const char *text, const char * /* word */)
{
  const auto group
    = make_info_print_options_def_group (nullptr);
  if (gdb::option::complete_options
      (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group))
    return;

  const char *word = advance_to_expression_complete_word_point (tracker, text);
  symbol_completer (ignore, tracker, text, word);
}

/* Implement the 'info locals' command.  */

void
info_locals_command (const char *args, int from_tty)
{
  info_print_options opts;
  auto grp = make_info_print_options_def_group (&opts);
  gdb::option::process_options
    (&args, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, grp);
  if (args != nullptr && *args == '\0')
    args = nullptr;

  print_frame_local_vars (get_selected_frame (_("No frame selected.")),
			  opts.quiet, args, opts.type_regexp,
			  0, gdb_stdout);
}

/* Iterate over all the argument variables in block B.  */

void
iterate_over_block_arg_vars (const struct block *b,
			     iterate_over_block_arg_local_vars_cb cb,
			     void *cb_data)
{
  struct block_iterator iter;
  struct symbol *sym, *sym2;

  ALL_BLOCK_SYMBOLS (b, iter, sym)
    {
      /* Don't worry about things which aren't arguments.  */
      if (SYMBOL_IS_ARGUMENT (sym))
	{
	  /* 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_search_name (SYMBOL_SEARCH_NAME (sym),
					    b, VAR_DOMAIN).symbol;
	  (*cb) (SYMBOL_PRINT_NAME (sym), sym2, cb_data);
	}
    }
}

/* Print all argument variables of the function of FRAME.
   Print them with values to STREAM.
   If REGEXP is not NULL, only print argument variables whose name
   matches REGEXP.
   If T_REGEXP is not NULL, only print argument variables whose type
   matches T_REGEXP.
   If no argument variables have been printed and !QUIET, prints a message
   explaining why no argument variables could be printed.

   This function will invalidate FRAME.  */

static void
print_frame_arg_vars (struct frame_info *frame,
		      bool quiet,
		      const char *regexp, const char *t_regexp,
		      struct ui_file *stream)
{
  struct print_variable_and_value_data cb_data;
  struct symbol *func;
  CORE_ADDR pc;
  gdb::optional<compiled_regex> preg;
  gdb::optional<compiled_regex> treg;

  if (!get_frame_pc_if_available (frame, &pc))
    {
      if (!quiet)
	fprintf_filtered (stream,
			  _("PC unavailable, cannot determine args.\n"));
      return;
    }

  func = get_frame_function (frame);
  if (func == NULL)
    {
      if (!quiet)
	fprintf_filtered (stream, _("No symbol table info available.\n"));
      return;
    }

  prepare_reg (regexp, &cb_data.preg);
  prepare_reg (t_regexp, &cb_data.treg);
  cb_data.frame_id = get_frame_id (frame);
  cb_data.num_tabs = 0;
  cb_data.stream = stream;
  cb_data.values_printed = 0;

  iterate_over_block_arg_vars (SYMBOL_BLOCK_VALUE (func),
			       do_print_variable_and_value, &cb_data);

  /* do_print_variable_and_value invalidates FRAME.  */
  frame = NULL;

  if (!cb_data.values_printed && !quiet)
    {
      if (regexp == NULL && t_regexp == NULL)
	fprintf_filtered (stream, _("No arguments.\n"));
      else
	fprintf_filtered (stream, _("No matching arguments.\n"));
    }
}

/* Implement the 'info args' command.  */

void
info_args_command (const char *args, int from_tty)
{
  info_print_options opts;
  auto grp = make_info_print_options_def_group (&opts);
  gdb::option::process_options
    (&args, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, grp);
  if (args != nullptr && *args == '\0')
    args = nullptr;

  print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
			opts.quiet, args, opts.type_regexp, gdb_stdout);
}

/* Return the symbol-block in which the selected frame is executing.
   Can return zero under various legitimate circumstances.

   If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
   code address within the block returned.  We use this to decide
   which macros are in scope.  */

const struct block *
get_selected_block (CORE_ADDR *addr_in_block)
{
  if (!has_stack_frames ())
    return 0;

  return get_frame_block (get_selected_frame (NULL), addr_in_block);
}

/* 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 (struct frame_info *frame, int *level_offset_ptr)
{
  /* Going up is simple: just call get_prev_frame enough times or
     until the initial frame is reached.  */
  while (*level_offset_ptr > 0)
    {
      struct frame_info *prev = get_prev_frame (frame);

      if (!prev)
	break;
      (*level_offset_ptr)--;
      frame = prev;
    }

  /* Going down is just as simple.  */
  while (*level_offset_ptr < 0)
    {
      struct frame_info *next = get_next_frame (frame);

      if (!next)
	break;
      (*level_offset_ptr)++;
      frame = next;
    }

  return frame;
}

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

static void
up_silently_base (const char *count_exp)
{
  struct frame_info *frame;
  int count = 1;

  if (count_exp)
    count = parse_and_eval_long (count_exp);

  frame = find_relative_frame (get_selected_frame ("No stack."), &count);
  if (count != 0 && count_exp == NULL)
    error (_("Initial frame selected; you cannot go up."));
  select_frame (frame);
}

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

static void
up_command (const char *count_exp, int from_tty)
{
  up_silently_base (count_exp);
  gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME);
}

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

static void
down_silently_base (const char *count_exp)
{
  struct frame_info *frame;
  int count = -1;

  if (count_exp)
    count = -parse_and_eval_long (count_exp);

  frame = find_relative_frame (get_selected_frame ("No stack."), &count);
  if (count != 0 && count_exp == NULL)
    {
      /* 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 (innermost) frame selected; you cannot go down."));
    }

  select_frame (frame);
}

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

static void
down_command (const char *count_exp, int from_tty)
{
  down_silently_base (count_exp);
  gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME);
}

void
return_command (const char *retval_exp, int from_tty)
{
  /* Initialize it just to avoid a GCC false warning.  */
  enum return_value_convention rv_conv = RETURN_VALUE_STRUCT_CONVENTION;
  struct frame_info *thisframe;
  struct gdbarch *gdbarch;
  struct symbol *thisfun;
  struct value *return_value = NULL;
  struct value *function = NULL;
  const char *query_prefix = "";

  thisframe = get_selected_frame ("No selected frame.");
  thisfun = get_frame_function (thisframe);
  gdbarch = get_frame_arch (thisframe);

  if (get_frame_type (get_current_frame ()) == INLINE_FRAME)
    error (_("Can not force return from an inlined function."));

  /* Compute the return value.  If the computation triggers an error,
     let it bail.  If the return type can't be handled, set
     RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
     message.  */
  if (retval_exp)
    {
      expression_up retval_expr = parse_expression (retval_exp);
      struct type *return_type = NULL;

      /* Compute the return value.  Should the computation fail, this
         call throws an error.  */
      return_value = evaluate_expression (retval_expr.get ());

      /* Cast return value to the return type of the function.  Should
         the cast fail, this call throws an error.  */
      if (thisfun != NULL)
	return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
      if (return_type == NULL)
      	{
	  if (retval_expr->elts[0].opcode != UNOP_CAST
	      && retval_expr->elts[0].opcode != UNOP_CAST_TYPE)
	    error (_("Return value type not available for selected "
		     "stack frame.\n"
		     "Please use an explicit cast of the value to return."));
	  return_type = value_type (return_value);
	}
      return_type = check_typedef (return_type);
      return_value = value_cast (return_type, return_value);

      /* Make sure the value is fully evaluated.  It may live in the
         stack frame we're about to pop.  */
      if (value_lazy (return_value))
	value_fetch_lazy (return_value);

      if (thisfun != NULL)
	function = read_var_value (thisfun, NULL, thisframe);

      rv_conv = RETURN_VALUE_REGISTER_CONVENTION;
      if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
	/* If the return-type is "void", don't try to find the
           return-value's location.  However, do still evaluate the
           return expression so that, even when the expression result
           is discarded, side effects such as "return i++" still
           occur.  */
	return_value = NULL;
      else if (thisfun != NULL)
	{
	  rv_conv = struct_return_convention (gdbarch, function, return_type);
	  if (rv_conv == RETURN_VALUE_STRUCT_CONVENTION
	      || rv_conv == RETURN_VALUE_ABI_RETURNS_ADDRESS)
	    {
	      query_prefix = "The location at which to store the "
		"function's return value is unknown.\n"
		"If you continue, the return value "
		"that you specified will be ignored.\n";
	      return_value = NULL;
	    }
	}
    }

  /* Does an interactive user really want to do this?  Include
     information, such as how well GDB can handle the return value, in
     the query message.  */
  if (from_tty)
    {
      int confirmed;

      if (thisfun == NULL)
	confirmed = query (_("%sMake selected stack frame return now? "),
			   query_prefix);
      else
	{
	  if (TYPE_NO_RETURN (thisfun->type))
	    warning (_("Function does not return normally to caller."));
	  confirmed = query (_("%sMake %s return now? "), query_prefix,
			     SYMBOL_PRINT_NAME (thisfun));
	}
      if (!confirmed)
	error (_("Not confirmed"));
    }

  /* Discard the selected frame and all frames inner-to it.  */
  frame_pop (get_selected_frame (NULL));

  /* Store RETURN_VALUE in the just-returned register set.  */
  if (return_value != NULL)
    {
      struct type *return_type = value_type (return_value);
      struct gdbarch *cache_arch = get_current_regcache ()->arch ();

      gdb_assert (rv_conv != RETURN_VALUE_STRUCT_CONVENTION
		  && rv_conv != RETURN_VALUE_ABI_RETURNS_ADDRESS);
      gdbarch_return_value (cache_arch, function, return_type,
			    get_current_regcache (), NULL /*read*/,
			    value_contents (return_value) /*write*/);
    }

  /* If we are at the end of a call dummy now, pop the dummy frame
     too.  */
  if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
    frame_pop (get_current_frame ());

  select_frame (get_current_frame ());
  /* If interactive, print the frame that is now current.  */
  if (from_tty)
    print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
}

/* Find the most inner frame in the current stack for a function called
   FUNCTION_NAME.  If no matching frame is found return NULL.  */

static struct frame_info *
find_frame_for_function (const char *function_name)
{
  /* Used to hold the lower and upper addresses for each of the
     SYMTAB_AND_LINEs found for functions matching FUNCTION_NAME.  */
  struct function_bounds
  {
    CORE_ADDR low, high;
  };
  struct frame_info *frame;
  bool found = false;
  int level = 1;

  gdb_assert (function_name != NULL);

  frame = get_current_frame ();
  std::vector<symtab_and_line> sals
    = decode_line_with_current_source (function_name,
				       DECODE_LINE_FUNFIRSTLINE);
  gdb::def_vector<function_bounds> func_bounds (sals.size ());
  for (size_t i = 0; i < sals.size (); i++)
    {
      if (sals[i].pspace != current_program_space)
	func_bounds[i].low = func_bounds[i].high = 0;
      else if (sals[i].pc == 0
	       || find_pc_partial_function (sals[i].pc, NULL,
					    &func_bounds[i].low,
					    &func_bounds[i].high) == 0)
	func_bounds[i].low = func_bounds[i].high = 0;
    }

  do
    {
      for (size_t i = 0; (i < sals.size () && !found); i++)
	found = (get_frame_pc (frame) >= func_bounds[i].low
		 && get_frame_pc (frame) < func_bounds[i].high);
      if (!found)
	{
	  level = 1;
	  frame = find_relative_frame (frame, &level);
	}
    }
  while (!found && level == 0);

  if (!found)
    frame = NULL;

  return frame;
}

/* Implements the dbx 'func' command.  */

static void
func_command (const char *arg, int from_tty)
{
  if (arg == NULL)
    return;

  struct frame_info *frame = find_frame_for_function (arg);
  if (frame == NULL)
    error (_("'%s' not within current stack frame."), arg);
  if (frame != get_selected_frame (NULL))
    {
      select_frame (frame);
      print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
    }
}

/* The qcs command line flags for the "frame apply" commands.  Keep
   this in sync with the "thread apply" commands.  */

using qcs_flag_option_def
  = gdb::option::flag_option_def<qcs_flags>;

static const gdb::option::option_def fr_qcs_flags_option_defs[] = {
  qcs_flag_option_def {
    "q", [] (qcs_flags *opt) { return &opt->quiet; },
    N_("Disables printing the frame location 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 array for all the "frame apply" options,
   with FLAGS and SET_BT_OPTS as context.  */

static inline std::array<gdb::option::option_def_group, 2>
make_frame_apply_options_def_group (qcs_flags *flags,
				    set_backtrace_options *set_bt_opts)
{
  return {{
    { {fr_qcs_flags_option_defs}, flags },
    { {set_backtrace_option_defs}, set_bt_opts },
  }};
}

/* Apply a GDB command to all stack frames, or a set of identified frames,
   or innermost COUNT frames.
   With a negative COUNT, apply command on outermost -COUNT frames.

   frame apply 3 info frame     Apply 'info frame' to frames 0, 1, 2
   frame apply -3 info frame    Apply 'info frame' to outermost 3 frames.
   frame apply all x/i $pc      Apply 'x/i $pc' cmd to all frames.
   frame apply all -s p local_var_no_idea_in_which_frame
                If a frame has a local variable called
                local_var_no_idea_in_which_frame, print frame
                and value of local_var_no_idea_in_which_frame.
   frame apply all -s -q p local_var_no_idea_in_which_frame
                Same as before, but only print the variable value.
   frame apply level 2-5 0 4-7 -s p i = i + 1
                Adds 1 to the variable i in the specified frames.
                Note that i will be incremented twice in
                frames 4 and 5.  */

/* Apply a GDB command to COUNT stack frames, starting at TRAILING.
   CMD starts with 0 or more qcs flags followed by the GDB command to apply.
   COUNT -1 means all frames starting at TRAILING.  WHICH_COMMAND is used
   for error messages.  */

static void
frame_apply_command_count (const char *which_command,
			   const char *cmd, int from_tty,
			   struct frame_info *trailing, int count)
{
  qcs_flags flags;
  set_backtrace_options set_bt_opts = user_set_backtrace_options;

  auto group = make_frame_apply_options_def_group (&flags, &set_bt_opts);
  gdb::option::process_options
    (&cmd, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group);

  validate_flags_qcs (which_command, &flags);

  if (cmd == NULL || *cmd == '\0')
    error (_("Please specify a command to apply on the selected frames"));

  /* The below will restore the current inferior/thread/frame.
     Usually, only the frame is effectively to be restored.
     But in case CMD switches of inferior/thread, better restore
     these also.  */
  scoped_restore_current_thread restore_thread;

  /* These options are handled quite deep in the unwind machinery, so
     we get to pass them down by swapping globals.  */
  scoped_restore restore_set_backtrace_options
    = make_scoped_restore (&user_set_backtrace_options, set_bt_opts);

  for (frame_info *fi = trailing; fi && count--; fi = get_prev_frame (fi))
    {
      QUIT;

      select_frame (fi);
      try
	{
	  std::string cmd_result;
	  {
	    /* In case CMD switches of inferior/thread/frame, the below
	       restores the inferior/thread/frame.  FI can then be
	       set to the selected frame.  */
	    scoped_restore_current_thread restore_fi_current_frame;

	    cmd_result = execute_command_to_string
	      (cmd, from_tty, gdb_stdout->term_out ());
	  }
	  fi = get_selected_frame (_("frame apply "
				     "unable to get selected frame."));
	  if (!flags.silent || cmd_result.length () > 0)
	    {
	      if (!flags.quiet)
		print_stack_frame (fi, 1, LOCATION, 0);
	      printf_filtered ("%s", cmd_result.c_str ());
	    }
	}
      catch (const gdb_exception_error &ex)
	{
	  fi = get_selected_frame (_("frame apply "
				     "unable to get selected frame."));
	  if (!flags.silent)
	    {
	      if (!flags.quiet)
		print_stack_frame (fi, 1, LOCATION, 0);
	      if (flags.cont)
		printf_filtered ("%s\n", ex.what ());
	      else
		throw;
	    }
	}
    }
}

/* Completer for the "frame apply ..." commands.  */

static void
frame_apply_completer (completion_tracker &tracker, const char *text)
{
  const auto group = make_frame_apply_options_def_group (nullptr, nullptr);
  if (gdb::option::complete_options
      (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group))
    return;

  complete_nested_command_line (tracker, text);
}

/* Completer for the "frame apply" commands.  */

static void
frame_apply_level_cmd_completer (struct cmd_list_element *ignore,
				 completion_tracker &tracker,
				 const char *text, const char */*word*/)
{
  /* Do this explicitly because there's an early return below.  */
  tracker.set_use_custom_word_point (true);

  number_or_range_parser levels (text);

  /* Skip the LEVEL list to find the options and command args.  */
  try
    {
      while (!levels.finished ())
	{
	  /* Call for effect.  */
	  levels.get_number ();

	  if (levels.in_range ())
	    levels.skip_range ();
	}
    }
  catch (const gdb_exception_error &ex)
    {
      /* get_number throws if it parses a negative number, for
	 example.  But a seemingly negative number may be the start of
	 an option instead.  */
    }

  const char *cmd = levels.cur_tok ();

  if (cmd == text)
    {
      /* No level list yet.  */
      return;
    }

  /* Check if we're past a valid LEVEL already.  */
  if (levels.finished ()
      && cmd > text && !isspace (cmd[-1]))
    return;

  /* We're past LEVELs, advance word point.  */
  tracker.advance_custom_word_point_by (cmd - text);
  text = cmd;

  frame_apply_completer (tracker, text);
}

/* Completer for the "frame apply all" command.  */

void
frame_apply_all_cmd_completer (struct cmd_list_element *ignore,
			       completion_tracker &tracker,
			       const char *text, const char */*word*/)
{
  frame_apply_completer (tracker, text);
}

/* Completer for the "frame apply COUNT" command.  */

static void
frame_apply_cmd_completer (struct cmd_list_element *ignore,
			   completion_tracker &tracker,
			   const char *text, const char */*word*/)
{
  const char *cmd = text;

  int count = get_number_trailer (&cmd, 0);
  if (count == 0)
    return;

  /* Check if we're past a valid COUNT already.  */
  if (cmd > text && !isspace (cmd[-1]))
    return;

  /* We're past COUNT, advance word point.  */
  tracker.advance_custom_word_point_by (cmd - text);
  text = cmd;

  frame_apply_completer (tracker, text);
}

/* Implementation of the "frame apply level" command.  */

static void
frame_apply_level_command (const char *cmd, int from_tty)
{
  if (!target_has_stack)
    error (_("No stack."));

  bool level_found = false;
  const char *levels_str = cmd;
  number_or_range_parser levels (levels_str);

  /* Skip the LEVEL list to find the flags and command args.  */
  while (!levels.finished ())
    {
      /* Call for effect.  */
      levels.get_number ();

      level_found = true;
      if (levels.in_range ())
	levels.skip_range ();
    }

  if (!level_found)
    error (_("Missing or invalid LEVEL... argument"));

  cmd = levels.cur_tok ();

  /* Redo the LEVELS parsing, but applying COMMAND.  */
  levels.init (levels_str);
  while (!levels.finished ())
    {
      const int level_beg = levels.get_number ();
      int n_frames;

      if (levels.in_range ())
	{
	  n_frames = levels.end_value () - level_beg + 1;
	  levels.skip_range ();
	}
      else
	n_frames = 1;

      frame_apply_command_count ("frame apply level", cmd, from_tty,
				 leading_innermost_frame (level_beg), n_frames);
    }
}

/* Implementation of the "frame apply all" command.  */

static void
frame_apply_all_command (const char *cmd, int from_tty)
{
  if (!target_has_stack)
    error (_("No stack."));

  frame_apply_command_count ("frame apply all", cmd, from_tty,
			     get_current_frame (), INT_MAX);
}

/* Implementation of the "frame apply" command.  */

static void
frame_apply_command (const char* cmd, int from_tty)
{
  int count;
  struct frame_info *trailing;

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

  if (cmd == NULL)
    error (_("Missing COUNT argument."));
  count = get_number_trailer (&cmd, 0);
  if (count == 0)
    error (_("Invalid COUNT argument."));

  if (count < 0)
    {
      trailing = trailing_outermost_frame (-count);
      count = -1;
    }
  else
    trailing = get_current_frame ();

  frame_apply_command_count ("frame apply", cmd, from_tty,
			     trailing, count);
}

/* Implementation of the "faas" command.  */

static void
faas_command (const char *cmd, int from_tty)
{
  std::string expanded = std::string ("frame apply all -s ") + cmd;
  execute_command (expanded.c_str (), from_tty);
}


/* Find inner-mode frame with frame address ADDRESS.  Return NULL if no
   matching frame can be found.  */

static struct frame_info *
find_frame_for_address (CORE_ADDR address)
{
  struct frame_id id;
  struct frame_info *fid;

  id = frame_id_build_wild (address);

  /* If (s)he specifies the frame with an address, he deserves
     what (s)he gets.  Still, give the highest one that matches.
     (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
     know).  */
  for (fid = get_current_frame ();
       fid != NULL;
       fid = get_prev_frame (fid))
    {
      if (frame_id_eq (id, get_frame_id (fid)))
	{
	  struct frame_info *prev_frame;

	  while (1)
	    {
	      prev_frame = get_prev_frame (fid);
	      if (!prev_frame
		  || !frame_id_eq (id, get_frame_id (prev_frame)))
		break;
	      fid = prev_frame;
	    }
	  return fid;
	}
    }
  return NULL;
}



/* Commands with a prefix of `frame apply'.  */
static struct cmd_list_element *frame_apply_cmd_list = NULL;

/* Commands with a prefix of `frame'.  */
static struct cmd_list_element *frame_cmd_list = NULL;

/* Commands with a prefix of `select frame'.  */
static struct cmd_list_element *select_frame_cmd_list = NULL;

/* Commands with a prefix of `info frame'.  */
static struct cmd_list_element *info_frame_cmd_list = NULL;

void
_initialize_stack (void)
{
  struct cmd_list_element *cmd;

  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_prefix_cmd ("frame", class_stack,
                  &frame_cmd.base_command, _("\
Select and print a stack frame.\n\
With no argument, print the selected stack frame.  (See also \"info frame\").\n\
A single numerical argument specifies the frame to select."),
                  &frame_cmd_list, "frame ", 1, &cmdlist);

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

#define FRAME_APPLY_OPTION_HELP "\
Prints the frame location information followed by COMMAND output.\n\
\n\
By default, an error raised during the execution of COMMAND\n\
aborts \"frame apply\".\n\
\n\
Options:\n\
%OPTIONS%"

  const auto frame_apply_opts
    = make_frame_apply_options_def_group (nullptr, nullptr);

  static std::string frame_apply_cmd_help = gdb::option::build_help (_("\
Apply a command to a number of frames.\n\
Usage: frame apply COUNT [OPTION]... COMMAND\n\
With a negative COUNT argument, applies the command on outermost -COUNT frames.\n"
				  FRAME_APPLY_OPTION_HELP),
			       frame_apply_opts);

  cmd = add_prefix_cmd ("apply", class_stack, frame_apply_command,
			frame_apply_cmd_help.c_str (),
			&frame_apply_cmd_list, "frame apply ", 1,
			&frame_cmd_list);
  set_cmd_completer_handle_brkchars (cmd, frame_apply_cmd_completer);

  static std::string frame_apply_all_cmd_help = gdb::option::build_help (_("\
Apply a command to all frames.\n\
\n\
Usage: frame apply all [OPTION]... COMMAND\n"
				  FRAME_APPLY_OPTION_HELP),
			       frame_apply_opts);

  cmd = add_cmd ("all", class_stack, frame_apply_all_command,
		 frame_apply_all_cmd_help.c_str (),
		 &frame_apply_cmd_list);
  set_cmd_completer_handle_brkchars (cmd, frame_apply_all_cmd_completer);

  static std::string frame_apply_level_cmd_help = gdb::option::build_help (_("\
Apply a command to a list of frames.\n\
\n\
Usage: frame apply level LEVEL... [OPTION]... COMMAND\n\
LEVEL is a space-separated list of levels of frames to apply COMMAND on.\n"
				  FRAME_APPLY_OPTION_HELP),
			       frame_apply_opts);

  cmd = add_cmd ("level", class_stack, frame_apply_level_command,
	   frame_apply_level_cmd_help.c_str (),
	   &frame_apply_cmd_list);
  set_cmd_completer_handle_brkchars (cmd, frame_apply_level_cmd_completer);

  cmd = add_com ("faas", class_stack, faas_command, _("\
Apply a command to all frames (ignoring errors and empty output).\n\
Usage: faas [OPTION]... COMMAND\n\
shortcut for 'frame apply all -s [OPTION]... COMMAND'\n\
See \"help frame apply all\" for available options."));
  set_cmd_completer_handle_brkchars (cmd, frame_apply_all_cmd_completer);

  add_prefix_cmd ("frame", class_stack,
		  &frame_cmd.base_command, _("\
Select and print a stack frame.\n\
With no argument, print the selected stack frame.  (See also \"info frame\").\n\
A single numerical argument specifies the frame to select."),
		  &frame_cmd_list, "frame ", 1, &cmdlist);
  add_com_alias ("f", "frame", class_stack, 1);

  add_cmd ("address", class_stack, &frame_cmd.address,
	   _("\
Select and print a stack frame by stack address.\n\
\n\
Usage: frame address STACK-ADDRESS"),
	   &frame_cmd_list);

  add_cmd ("view", class_stack, &frame_cmd.view,
	   _("\
View a stack frame that might be outside the current backtrace.\n\
\n\
Usage: frame view STACK-ADDRESS\n\
       frame view STACK-ADDRESS PC-ADDRESS"),
	   &frame_cmd_list);

  cmd = add_cmd ("function", class_stack, &frame_cmd.function,
	   _("\
Select and print a stack frame by function name.\n\
\n\
Usage: frame function NAME\n\
\n\
The innermost frame that visited function NAME is selected."),
	   &frame_cmd_list);
  set_cmd_completer (cmd, frame_selection_by_function_completer);


  add_cmd ("level", class_stack, &frame_cmd.level,
	   _("\
Select and print a stack frame by level.\n\
\n\
Usage: frame level LEVEL"),
	   &frame_cmd_list);

  cmd = add_prefix_cmd_suppress_notification ("select-frame", class_stack,
		      &select_frame_cmd.base_command, _("\
Select a stack frame without printing anything.\n\
A single numerical argument specifies the frame to select."),
		      &select_frame_cmd_list, "select-frame ", 1, &cmdlist,
		      &cli_suppress_notification.user_selected_context);

  add_cmd_suppress_notification ("address", class_stack,
			 &select_frame_cmd.address, _("\
Select a stack frame by stack address.\n\
\n\
Usage: select-frame address STACK-ADDRESS"),
			 &select_frame_cmd_list,
			 &cli_suppress_notification.user_selected_context);


  add_cmd_suppress_notification ("view", class_stack,
		 &select_frame_cmd.view, _("\
Select a stack frame that might be outside the current backtrace.\n\
\n\
Usage: select-frame view STACK-ADDRESS\n\
       select-frame view STACK-ADDRESS PC-ADDRESS"),
		 &select_frame_cmd_list,
		 &cli_suppress_notification.user_selected_context);

  cmd = add_cmd_suppress_notification ("function", class_stack,
	       &select_frame_cmd.function, _("\
Select a stack frame by function name.\n\
\n\
Usage: select-frame function NAME"),
	       &select_frame_cmd_list,
	       &cli_suppress_notification.user_selected_context);
  set_cmd_completer (cmd, frame_selection_by_function_completer);

  add_cmd_suppress_notification ("level", class_stack,
			 &select_frame_cmd.level, _("\
Select a stack frame by level.\n\
\n\
Usage: select-frame level LEVEL"),
			 &select_frame_cmd_list,
			 &cli_suppress_notification.user_selected_context);

  const auto backtrace_opts
    = make_backtrace_options_def_group (nullptr, nullptr, nullptr);

  static std::string backtrace_help
    = gdb::option::build_help (_("\
Print backtrace of all stack frames, or innermost COUNT frames.\n\
Usage: backtrace [OPTION]... [QUALIFIER]... [COUNT | -COUNT]\n\
\n\
Options:\n\
%OPTIONS%\n\
\n\
For backward compatibility, the following qualifiers are supported:\n\
\n\
   full       - same as -full option.\n\
   no-filters - same as -no-filters option.\n\
   hide       - same as -hide.\n\
\n\
With a negative COUNT, print outermost -COUNT frames."),
			       backtrace_opts);

  cmd_list_element *c = add_com ("backtrace", class_stack,
				 backtrace_command,
				 backtrace_help.c_str ());
  set_cmd_completer_handle_brkchars (c, backtrace_command_completer);

  add_com_alias ("bt", "backtrace", class_stack, 0);

  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_prefix_cmd ("frame", class_info, &info_frame_cmd.base_command,
		  _("All about the selected stack frame.\n\
With no arguments, displays information about the currently selected stack\n\
frame.  Alternatively a frame specification may be provided (See \"frame\")\n\
the information is then printed about the specified frame."),
		  &info_frame_cmd_list, "info frame ", 1, &infolist);
  add_info_alias ("f", "frame", 1);

  add_cmd ("address", class_stack, &info_frame_cmd.address,
	   _("\
Print information about a stack frame selected by stack address.\n\
\n\
Usage: info frame address STACK-ADDRESS"),
	   &info_frame_cmd_list);

  add_cmd ("view", class_stack, &info_frame_cmd.view,
	   _("\
Print information about a stack frame outside the current backtrace.\n\
\n\
Usage: info frame view STACK-ADDRESS\n\
       info frame view STACK-ADDRESS PC-ADDRESS"),
	   &info_frame_cmd_list);

  cmd = add_cmd ("function", class_stack, &info_frame_cmd.function,
	   _("\
Print information about a stack frame selected by function name.\n\
\n\
Usage: info frame function NAME"),
	   &info_frame_cmd_list);
  set_cmd_completer (cmd, frame_selection_by_function_completer);

  add_cmd ("level", class_stack, &info_frame_cmd.level,
	   _("\
Print information about a stack frame selected by level.\n\
\n\
Usage: info frame level LEVEL"),
	   &info_frame_cmd_list);

  cmd = add_info ("locals", info_locals_command,
		  info_print_args_help (_("\
All local variables of current stack frame or those matching REGEXPs.\n\
Usage: info locals [-q] [-t TYPEREGEXP] [NAMEREGEXP]\n\
Prints the local variables of the current stack frame.\n"),
					_("local variables"),
					false));
  set_cmd_completer_handle_brkchars (cmd, info_print_command_completer);
  cmd = add_info ("args", info_args_command,
		  info_print_args_help (_("\
All argument variables of current stack frame or those matching REGEXPs.\n\
Usage: info args [-q] [-t TYPEREGEXP] [NAMEREGEXP]\n\
Prints the argument variables of the current stack frame.\n"),
					_("argument variables"),
					false));
  set_cmd_completer_handle_brkchars (cmd, info_print_command_completer);

  if (dbx_commands)
    add_com ("func", class_stack, func_command, _("\
Select the stack frame that contains NAME.\n\
Usage: func NAME"));

  /* Install "set print raw frame-arguments", a deprecated spelling of
     "set print raw-frame-arguments".  */
  cmd = add_setshow_boolean_cmd
    ("frame-arguments", no_class,
     &user_frame_print_options.print_raw_frame_arguments,
     _("\
Set whether to print frame arguments in raw form."), _("\
Show whether to print frame arguments in raw form."), _("\
If set, frame arguments are printed in raw form, bypassing any\n\
pretty-printers for that value."),
     NULL, NULL,
     &setprintrawlist, &showprintrawlist);
  deprecate_cmd (cmd, "set print raw-frame-arguments");

  add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack,
			        &disassemble_next_line, _("\
Set whether to disassemble next source line or insn when execution stops."),
				_("\
Show whether to disassemble next source line or insn when execution stops."),
				_("\
If ON, GDB will display disassembly of the next source line, in addition\n\
to displaying the source line itself.  If the next source line cannot\n\
be displayed (e.g., source is unavailable or there's no line info), GDB\n\
will display disassembly of next instruction instead of showing the\n\
source line.\n\
If AUTO, display disassembly of next instruction only if the source line\n\
cannot be displayed.\n\
If OFF (which is the default), never display the disassembly of the next\n\
source line."),
			        NULL,
			        show_disassemble_next_line,
			        &setlist, &showlist);
  disassemble_next_line = AUTO_BOOLEAN_FALSE;

  gdb::option::add_setshow_cmds_for_options
    (class_stack, &user_frame_print_options,
     frame_print_option_defs, &setprintlist, &showprintlist);
}