aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/clang16/lib/AST/DeclCXX.cpp
blob: 3cf355714107c030bc5fcf267e1a0dcc51b66f39 (plain) (blame)
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
//===- DeclCXX.cpp - C++ Declaration AST Node Implementation --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the C++ related Decl classes.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/DeclCXX.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/ASTUnresolvedSet.h"
#include "clang/AST/Attr.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/LambdaCapture.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/ODRHash.h"
#include "clang/AST/Type.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/UnresolvedSet.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/OperatorKinds.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/Specifiers.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>

using namespace clang;

//===----------------------------------------------------------------------===//
// Decl Allocation/Deallocation Method Implementations
//===----------------------------------------------------------------------===//

void AccessSpecDecl::anchor() {}

AccessSpecDecl *AccessSpecDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) AccessSpecDecl(EmptyShell());
}

void LazyASTUnresolvedSet::getFromExternalSource(ASTContext &C) const {
  ExternalASTSource *Source = C.getExternalSource();
  assert(Impl.Decls.isLazy() && "getFromExternalSource for non-lazy set");
  assert(Source && "getFromExternalSource with no external source");

  for (ASTUnresolvedSet::iterator I = Impl.begin(); I != Impl.end(); ++I)
    I.setDecl(cast<NamedDecl>(Source->GetExternalDecl(
        reinterpret_cast<uintptr_t>(I.getDecl()) >> 2)));
  Impl.Decls.setLazy(false);
}

CXXRecordDecl::DefinitionData::DefinitionData(CXXRecordDecl *D)
    : UserDeclaredConstructor(false), UserDeclaredSpecialMembers(0),
      Aggregate(true), PlainOldData(true), Empty(true), Polymorphic(false),
      Abstract(false), IsStandardLayout(true), IsCXX11StandardLayout(true),
      HasBasesWithFields(false), HasBasesWithNonStaticDataMembers(false),
      HasPrivateFields(false), HasProtectedFields(false),
      HasPublicFields(false), HasMutableFields(false), HasVariantMembers(false),
      HasOnlyCMembers(true), HasInitMethod(false), HasInClassInitializer(false),
      HasUninitializedReferenceMember(false), HasUninitializedFields(false),
      HasInheritedConstructor(false), HasInheritedDefaultConstructor(false),
      HasInheritedAssignment(false),
      NeedOverloadResolutionForCopyConstructor(false),
      NeedOverloadResolutionForMoveConstructor(false),
      NeedOverloadResolutionForCopyAssignment(false),
      NeedOverloadResolutionForMoveAssignment(false),
      NeedOverloadResolutionForDestructor(false),
      DefaultedCopyConstructorIsDeleted(false),
      DefaultedMoveConstructorIsDeleted(false),
      DefaultedCopyAssignmentIsDeleted(false),
      DefaultedMoveAssignmentIsDeleted(false),
      DefaultedDestructorIsDeleted(false), HasTrivialSpecialMembers(SMF_All),
      HasTrivialSpecialMembersForCall(SMF_All),
      DeclaredNonTrivialSpecialMembers(0),
      DeclaredNonTrivialSpecialMembersForCall(0), HasIrrelevantDestructor(true),
      HasConstexprNonCopyMoveConstructor(false),
      HasDefaultedDefaultConstructor(false),
      DefaultedDefaultConstructorIsConstexpr(true),
      HasConstexprDefaultConstructor(false),
      DefaultedDestructorIsConstexpr(true),
      HasNonLiteralTypeFieldsOrBases(false), StructuralIfLiteral(true),
      UserProvidedDefaultConstructor(false), DeclaredSpecialMembers(0),
      ImplicitCopyConstructorCanHaveConstParamForVBase(true),
      ImplicitCopyConstructorCanHaveConstParamForNonVBase(true),
      ImplicitCopyAssignmentHasConstParam(true),
      HasDeclaredCopyConstructorWithConstParam(false),
      HasDeclaredCopyAssignmentWithConstParam(false),
      IsAnyDestructorNoReturn(false), IsLambda(false),
      IsParsingBaseSpecifiers(false), ComputedVisibleConversions(false),
      HasODRHash(false), Definition(D) {}

CXXBaseSpecifier *CXXRecordDecl::DefinitionData::getBasesSlowCase() const {
  return Bases.get(Definition->getASTContext().getExternalSource());
}

CXXBaseSpecifier *CXXRecordDecl::DefinitionData::getVBasesSlowCase() const {
  return VBases.get(Definition->getASTContext().getExternalSource());
}

CXXRecordDecl::CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C,
                             DeclContext *DC, SourceLocation StartLoc,
                             SourceLocation IdLoc, IdentifierInfo *Id,
                             CXXRecordDecl *PrevDecl)
    : RecordDecl(K, TK, C, DC, StartLoc, IdLoc, Id, PrevDecl),
      DefinitionData(PrevDecl ? PrevDecl->DefinitionData
                              : nullptr) {}

CXXRecordDecl *CXXRecordDecl::Create(const ASTContext &C, TagKind TK,
                                     DeclContext *DC, SourceLocation StartLoc,
                                     SourceLocation IdLoc, IdentifierInfo *Id,
                                     CXXRecordDecl *PrevDecl,
                                     bool DelayTypeCreation) {
  auto *R = new (C, DC) CXXRecordDecl(CXXRecord, TK, C, DC, StartLoc, IdLoc, Id,
                                      PrevDecl);
  R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);

  // FIXME: DelayTypeCreation seems like such a hack
  if (!DelayTypeCreation)
    C.getTypeDeclType(R, PrevDecl);
  return R;
}

CXXRecordDecl *
CXXRecordDecl::CreateLambda(const ASTContext &C, DeclContext *DC,
                            TypeSourceInfo *Info, SourceLocation Loc,
                            unsigned DependencyKind, bool IsGeneric,
                            LambdaCaptureDefault CaptureDefault) {
  auto *R = new (C, DC) CXXRecordDecl(CXXRecord, TTK_Class, C, DC, Loc, Loc,
                                      nullptr, nullptr);
  R->setBeingDefined(true);
  R->DefinitionData = new (C) struct LambdaDefinitionData(
      R, Info, DependencyKind, IsGeneric, CaptureDefault);
  R->setMayHaveOutOfDateDef(false);
  R->setImplicit(true);

  C.getTypeDeclType(R, /*PrevDecl=*/nullptr);
  return R;
}

CXXRecordDecl *
CXXRecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
  auto *R = new (C, ID) CXXRecordDecl(
      CXXRecord, TTK_Struct, C, nullptr, SourceLocation(), SourceLocation(),
      nullptr, nullptr);
  R->setMayHaveOutOfDateDef(false);
  return R;
}

/// Determine whether a class has a repeated base class. This is intended for
/// use when determining if a class is standard-layout, so makes no attempt to
/// handle virtual bases.
static bool hasRepeatedBaseClass(const CXXRecordDecl *StartRD) {
  llvm::SmallPtrSet<const CXXRecordDecl*, 8> SeenBaseTypes;
  SmallVector<const CXXRecordDecl*, 8> WorkList = {StartRD};
  while (!WorkList.empty()) {
    const CXXRecordDecl *RD = WorkList.pop_back_val();
    if (RD->getTypeForDecl()->isDependentType())
      continue;
    for (const CXXBaseSpecifier &BaseSpec : RD->bases()) {
      if (const CXXRecordDecl *B = BaseSpec.getType()->getAsCXXRecordDecl()) {
        if (!SeenBaseTypes.insert(B).second)
          return true;
        WorkList.push_back(B);
      }
    }
  }
  return false;
}

void
CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
                        unsigned NumBases) {
  ASTContext &C = getASTContext();

  if (!data().Bases.isOffset() && data().NumBases > 0)
    C.Deallocate(data().getBases());

  if (NumBases) {
    if (!C.getLangOpts().CPlusPlus17) {
      // C++ [dcl.init.aggr]p1:
      //   An aggregate is [...] a class with [...] no base classes [...].
      data().Aggregate = false;
    }

    // C++ [class]p4:
    //   A POD-struct is an aggregate class...
    data().PlainOldData = false;
  }

  // The set of seen virtual base types.
  llvm::SmallPtrSet<CanQualType, 8> SeenVBaseTypes;

  // The virtual bases of this class.
  SmallVector<const CXXBaseSpecifier *, 8> VBases;

  data().Bases = new(C) CXXBaseSpecifier [NumBases];
  data().NumBases = NumBases;
  for (unsigned i = 0; i < NumBases; ++i) {
    data().getBases()[i] = *Bases[i];
    // Keep track of inherited vbases for this base class.
    const CXXBaseSpecifier *Base = Bases[i];
    QualType BaseType = Base->getType();
    // Skip dependent types; we can't do any checking on them now.
    if (BaseType->isDependentType())
      continue;
    auto *BaseClassDecl =
        cast<CXXRecordDecl>(BaseType->castAs<RecordType>()->getDecl());

    // C++2a [class]p7:
    //   A standard-layout class is a class that:
    //    [...]
    //    -- has all non-static data members and bit-fields in the class and
    //       its base classes first declared in the same class
    if (BaseClassDecl->data().HasBasesWithFields ||
        !BaseClassDecl->field_empty()) {
      if (data().HasBasesWithFields)
        // Two bases have members or bit-fields: not standard-layout.
        data().IsStandardLayout = false;
      data().HasBasesWithFields = true;
    }

    // C++11 [class]p7:
    //   A standard-layout class is a class that:
    //     -- [...] has [...] at most one base class with non-static data
    //        members
    if (BaseClassDecl->data().HasBasesWithNonStaticDataMembers ||
        BaseClassDecl->hasDirectFields()) {
      if (data().HasBasesWithNonStaticDataMembers)
        data().IsCXX11StandardLayout = false;
      data().HasBasesWithNonStaticDataMembers = true;
    }

    if (!BaseClassDecl->isEmpty()) {
      // C++14 [meta.unary.prop]p4:
      //   T is a class type [...] with [...] no base class B for which
      //   is_empty<B>::value is false.
      data().Empty = false;
    }

    // C++1z [dcl.init.agg]p1:
    //   An aggregate is a class with [...] no private or protected base classes
    if (Base->getAccessSpecifier() != AS_public) {
      data().Aggregate = false;

      // C++20 [temp.param]p7:
      //   A structural type is [...] a literal class type with [...] all base
      //   classes [...] public
      data().StructuralIfLiteral = false;
    }

    // C++ [class.virtual]p1:
    //   A class that declares or inherits a virtual function is called a
    //   polymorphic class.
    if (BaseClassDecl->isPolymorphic()) {
      data().Polymorphic = true;

      //   An aggregate is a class with [...] no virtual functions.
      data().Aggregate = false;
    }

    // C++0x [class]p7:
    //   A standard-layout class is a class that: [...]
    //    -- has no non-standard-layout base classes
    if (!BaseClassDecl->isStandardLayout())
      data().IsStandardLayout = false;
    if (!BaseClassDecl->isCXX11StandardLayout())
      data().IsCXX11StandardLayout = false;

    // Record if this base is the first non-literal field or base.
    if (!hasNonLiteralTypeFieldsOrBases() && !BaseType->isLiteralType(C))
      data().HasNonLiteralTypeFieldsOrBases = true;

    // Now go through all virtual bases of this base and add them.
    for (const auto &VBase : BaseClassDecl->vbases()) {
      // Add this base if it's not already in the list.
      if (SeenVBaseTypes.insert(C.getCanonicalType(VBase.getType())).second) {
        VBases.push_back(&VBase);

        // C++11 [class.copy]p8:
        //   The implicitly-declared copy constructor for a class X will have
        //   the form 'X::X(const X&)' if each [...] virtual base class B of X
        //   has a copy constructor whose first parameter is of type
        //   'const B&' or 'const volatile B&' [...]
        if (CXXRecordDecl *VBaseDecl = VBase.getType()->getAsCXXRecordDecl())
          if (!VBaseDecl->hasCopyConstructorWithConstParam())
            data().ImplicitCopyConstructorCanHaveConstParamForVBase = false;

        // C++1z [dcl.init.agg]p1:
        //   An aggregate is a class with [...] no virtual base classes
        data().Aggregate = false;
      }
    }

    if (Base->isVirtual()) {
      // Add this base if it's not already in the list.
      if (SeenVBaseTypes.insert(C.getCanonicalType(BaseType)).second)
        VBases.push_back(Base);

      // C++14 [meta.unary.prop] is_empty:
      //   T is a class type, but not a union type, with ... no virtual base
      //   classes
      data().Empty = false;

      // C++1z [dcl.init.agg]p1:
      //   An aggregate is a class with [...] no virtual base classes
      data().Aggregate = false;

      // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
      //   A [default constructor, copy/move constructor, or copy/move assignment
      //   operator for a class X] is trivial [...] if:
      //    -- class X has [...] no virtual base classes
      data().HasTrivialSpecialMembers &= SMF_Destructor;
      data().HasTrivialSpecialMembersForCall &= SMF_Destructor;

      // C++0x [class]p7:
      //   A standard-layout class is a class that: [...]
      //    -- has [...] no virtual base classes
      data().IsStandardLayout = false;
      data().IsCXX11StandardLayout = false;

      // C++20 [dcl.constexpr]p3:
      //   In the definition of a constexpr function [...]
      //    -- if the function is a constructor or destructor,
      //       its class shall not have any virtual base classes
      data().DefaultedDefaultConstructorIsConstexpr = false;
      data().DefaultedDestructorIsConstexpr = false;

      // C++1z [class.copy]p8:
      //   The implicitly-declared copy constructor for a class X will have
      //   the form 'X::X(const X&)' if each potentially constructed subobject
      //   has a copy constructor whose first parameter is of type
      //   'const B&' or 'const volatile B&' [...]
      if (!BaseClassDecl->hasCopyConstructorWithConstParam())
        data().ImplicitCopyConstructorCanHaveConstParamForVBase = false;
    } else {
      // C++ [class.ctor]p5:
      //   A default constructor is trivial [...] if:
      //    -- all the direct base classes of its class have trivial default
      //       constructors.
      if (!BaseClassDecl->hasTrivialDefaultConstructor())
        data().HasTrivialSpecialMembers &= ~SMF_DefaultConstructor;

      // C++0x [class.copy]p13:
      //   A copy/move constructor for class X is trivial if [...]
      //    [...]
      //    -- the constructor selected to copy/move each direct base class
      //       subobject is trivial, and
      if (!BaseClassDecl->hasTrivialCopyConstructor())
        data().HasTrivialSpecialMembers &= ~SMF_CopyConstructor;

      if (!BaseClassDecl->hasTrivialCopyConstructorForCall())
        data().HasTrivialSpecialMembersForCall &= ~SMF_CopyConstructor;

      // If the base class doesn't have a simple move constructor, we'll eagerly
      // declare it and perform overload resolution to determine which function
      // it actually calls. If it does have a simple move constructor, this
      // check is correct.
      if (!BaseClassDecl->hasTrivialMoveConstructor())
        data().HasTrivialSpecialMembers &= ~SMF_MoveConstructor;

      if (!BaseClassDecl->hasTrivialMoveConstructorForCall())
        data().HasTrivialSpecialMembersForCall &= ~SMF_MoveConstructor;

      // C++0x [class.copy]p27:
      //   A copy/move assignment operator for class X is trivial if [...]
      //    [...]
      //    -- the assignment operator selected to copy/move each direct base
      //       class subobject is trivial, and
      if (!BaseClassDecl->hasTrivialCopyAssignment())
        data().HasTrivialSpecialMembers &= ~SMF_CopyAssignment;
      // If the base class doesn't have a simple move assignment, we'll eagerly
      // declare it and perform overload resolution to determine which function
      // it actually calls. If it does have a simple move assignment, this
      // check is correct.
      if (!BaseClassDecl->hasTrivialMoveAssignment())
        data().HasTrivialSpecialMembers &= ~SMF_MoveAssignment;

      // C++11 [class.ctor]p6:
      //   If that user-written default constructor would satisfy the
      //   requirements of a constexpr constructor, the implicitly-defined
      //   default constructor is constexpr.
      if (!BaseClassDecl->hasConstexprDefaultConstructor())
        data().DefaultedDefaultConstructorIsConstexpr = false;

      // C++1z [class.copy]p8:
      //   The implicitly-declared copy constructor for a class X will have
      //   the form 'X::X(const X&)' if each potentially constructed subobject
      //   has a copy constructor whose first parameter is of type
      //   'const B&' or 'const volatile B&' [...]
      if (!BaseClassDecl->hasCopyConstructorWithConstParam())
        data().ImplicitCopyConstructorCanHaveConstParamForNonVBase = false;
    }

    // C++ [class.ctor]p3:
    //   A destructor is trivial if all the direct base classes of its class
    //   have trivial destructors.
    if (!BaseClassDecl->hasTrivialDestructor())
      data().HasTrivialSpecialMembers &= ~SMF_Destructor;

    if (!BaseClassDecl->hasTrivialDestructorForCall())
      data().HasTrivialSpecialMembersForCall &= ~SMF_Destructor;

    if (!BaseClassDecl->hasIrrelevantDestructor())
      data().HasIrrelevantDestructor = false;

    if (BaseClassDecl->isAnyDestructorNoReturn())
      data().IsAnyDestructorNoReturn = true;

    // C++11 [class.copy]p18:
    //   The implicitly-declared copy assignment operator for a class X will
    //   have the form 'X& X::operator=(const X&)' if each direct base class B
    //   of X has a copy assignment operator whose parameter is of type 'const
    //   B&', 'const volatile B&', or 'B' [...]
    if (!BaseClassDecl->hasCopyAssignmentWithConstParam())
      data().ImplicitCopyAssignmentHasConstParam = false;

    // A class has an Objective-C object member if... or any of its bases
    // has an Objective-C object member.
    if (BaseClassDecl->hasObjectMember())
      setHasObjectMember(true);

    if (BaseClassDecl->hasVolatileMember())
      setHasVolatileMember(true);

    if (BaseClassDecl->getArgPassingRestrictions() ==
        RecordDecl::APK_CanNeverPassInRegs)
      setArgPassingRestrictions(RecordDecl::APK_CanNeverPassInRegs);

    // Keep track of the presence of mutable fields.
    if (BaseClassDecl->hasMutableFields())
      data().HasMutableFields = true;

    if (BaseClassDecl->hasUninitializedReferenceMember())
      data().HasUninitializedReferenceMember = true;

    if (!BaseClassDecl->allowConstDefaultInit())
      data().HasUninitializedFields = true;

    addedClassSubobject(BaseClassDecl);
  }

  // C++2a [class]p7:
  //   A class S is a standard-layout class if it:
  //     -- has at most one base class subobject of any given type
  //
  // Note that we only need to check this for classes with more than one base
  // class. If there's only one base class, and it's standard layout, then
  // we know there are no repeated base classes.
  if (data().IsStandardLayout && NumBases > 1 && hasRepeatedBaseClass(this))
    data().IsStandardLayout = false;

  if (VBases.empty()) {
    data().IsParsingBaseSpecifiers = false;
    return;
  }

  // Create base specifier for any direct or indirect virtual bases.
  data().VBases = new (C) CXXBaseSpecifier[VBases.size()];
  data().NumVBases = VBases.size();
  for (int I = 0, E = VBases.size(); I != E; ++I) {
    QualType Type = VBases[I]->getType();
    if (!Type->isDependentType())
      addedClassSubobject(Type->getAsCXXRecordDecl());
    data().getVBases()[I] = *VBases[I];
  }

  data().IsParsingBaseSpecifiers = false;
}

unsigned CXXRecordDecl::getODRHash() const {
  assert(hasDefinition() && "ODRHash only for records with definitions");

  // Previously calculated hash is stored in DefinitionData.
  if (DefinitionData->HasODRHash)
    return DefinitionData->ODRHash;

  // Only calculate hash on first call of getODRHash per record.
  ODRHash Hash;
  Hash.AddCXXRecordDecl(getDefinition());
  DefinitionData->HasODRHash = true;
  DefinitionData->ODRHash = Hash.CalculateHash();

  return DefinitionData->ODRHash;
}

void CXXRecordDecl::addedClassSubobject(CXXRecordDecl *Subobj) {
  // C++11 [class.copy]p11:
  //   A defaulted copy/move constructor for a class X is defined as
  //   deleted if X has:
  //    -- a direct or virtual base class B that cannot be copied/moved [...]
  //    -- a non-static data member of class type M (or array thereof)
  //       that cannot be copied or moved [...]
  if (!Subobj->hasSimpleCopyConstructor())
    data().NeedOverloadResolutionForCopyConstructor = true;
  if (!Subobj->hasSimpleMoveConstructor())
    data().NeedOverloadResolutionForMoveConstructor = true;

  // C++11 [class.copy]p23:
  //   A defaulted copy/move assignment operator for a class X is defined as
  //   deleted if X has:
  //    -- a direct or virtual base class B that cannot be copied/moved [...]
  //    -- a non-static data member of class type M (or array thereof)
  //        that cannot be copied or moved [...]
  if (!Subobj->hasSimpleCopyAssignment())
    data().NeedOverloadResolutionForCopyAssignment = true;
  if (!Subobj->hasSimpleMoveAssignment())
    data().NeedOverloadResolutionForMoveAssignment = true;

  // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5:
  //   A defaulted [ctor or dtor] for a class X is defined as
  //   deleted if X has:
  //    -- any direct or virtual base class [...] has a type with a destructor
  //       that is deleted or inaccessible from the defaulted [ctor or dtor].
  //    -- any non-static data member has a type with a destructor
  //       that is deleted or inaccessible from the defaulted [ctor or dtor].
  if (!Subobj->hasSimpleDestructor()) {
    data().NeedOverloadResolutionForCopyConstructor = true;
    data().NeedOverloadResolutionForMoveConstructor = true;
    data().NeedOverloadResolutionForDestructor = true;
  }

  // C++2a [dcl.constexpr]p4:
  //   The definition of a constexpr destructor [shall] satisfy the
  //   following requirement:
  //   -- for every subobject of class type or (possibly multi-dimensional)
  //      array thereof, that class type shall have a constexpr destructor
  if (!Subobj->hasConstexprDestructor())
    data().DefaultedDestructorIsConstexpr = false;

  // C++20 [temp.param]p7:
  //   A structural type is [...] a literal class type [for which] the types
  //   of all base classes and non-static data members are structural types or
  //   (possibly multi-dimensional) array thereof
  if (!Subobj->data().StructuralIfLiteral)
    data().StructuralIfLiteral = false;
}

bool CXXRecordDecl::hasConstexprDestructor() const {
  auto *Dtor = getDestructor();
  return Dtor ? Dtor->isConstexpr() : defaultedDestructorIsConstexpr();
}

bool CXXRecordDecl::hasAnyDependentBases() const {
  if (!isDependentContext())
    return false;

  return !forallBases([](const CXXRecordDecl *) { return true; });
}

bool CXXRecordDecl::isTriviallyCopyable() const {
  // C++0x [class]p5:
  //   A trivially copyable class is a class that:
  //   -- has no non-trivial copy constructors,
  if (hasNonTrivialCopyConstructor()) return false;
  //   -- has no non-trivial move constructors,
  if (hasNonTrivialMoveConstructor()) return false;
  //   -- has no non-trivial copy assignment operators,
  if (hasNonTrivialCopyAssignment()) return false;
  //   -- has no non-trivial move assignment operators, and
  if (hasNonTrivialMoveAssignment()) return false;
  //   -- has a trivial destructor.
  if (!hasTrivialDestructor()) return false;

  return true;
}

void CXXRecordDecl::markedVirtualFunctionPure() {
  // C++ [class.abstract]p2:
  //   A class is abstract if it has at least one pure virtual function.
  data().Abstract = true;
}

bool CXXRecordDecl::hasSubobjectAtOffsetZeroOfEmptyBaseType(
    ASTContext &Ctx, const CXXRecordDecl *XFirst) {
  if (!getNumBases())
    return false;

  llvm::SmallPtrSet<const CXXRecordDecl*, 8> Bases;
  llvm::SmallPtrSet<const CXXRecordDecl*, 8> M;
  SmallVector<const CXXRecordDecl*, 8> WorkList;

  // Visit a type that we have determined is an element of M(S).
  auto Visit = [&](const CXXRecordDecl *RD) -> bool {
    RD = RD->getCanonicalDecl();

    // C++2a [class]p8:
    //   A class S is a standard-layout class if it [...] has no element of the
    //   set M(S) of types as a base class.
    //
    // If we find a subobject of an empty type, it might also be a base class,
    // so we'll need to walk the base classes to check.
    if (!RD->data().HasBasesWithFields) {
      // Walk the bases the first time, stopping if we find the type. Build a
      // set of them so we don't need to walk them again.
      if (Bases.empty()) {
        bool RDIsBase = !forallBases([&](const CXXRecordDecl *Base) -> bool {
          Base = Base->getCanonicalDecl();
          if (RD == Base)
            return false;
          Bases.insert(Base);
          return true;
        });
        if (RDIsBase)
          return true;
      } else {
        if (Bases.count(RD))
          return true;
      }
    }

    if (M.insert(RD).second)
      WorkList.push_back(RD);
    return false;
  };

  if (Visit(XFirst))
    return true;

  while (!WorkList.empty()) {
    const CXXRecordDecl *X = WorkList.pop_back_val();

    // FIXME: We don't check the bases of X. That matches the standard, but
    // that sure looks like a wording bug.

    //   -- If X is a non-union class type with a non-static data member
    //      [recurse to each field] that is either of zero size or is the
    //      first non-static data member of X
    //   -- If X is a union type, [recurse to union members]
    bool IsFirstField = true;
    for (auto *FD : X->fields()) {
      // FIXME: Should we really care about the type of the first non-static
      // data member of a non-union if there are preceding unnamed bit-fields?
      if (FD->isUnnamedBitfield())
        continue;

      if (!IsFirstField && !FD->isZeroSize(Ctx))
        continue;

      //   -- If X is n array type, [visit the element type]
      QualType T = Ctx.getBaseElementType(FD->getType());
      if (auto *RD = T->getAsCXXRecordDecl())
        if (Visit(RD))
          return true;

      if (!X->isUnion())
        IsFirstField = false;
    }
  }

  return false;
}

bool CXXRecordDecl::lambdaIsDefaultConstructibleAndAssignable() const {
  assert(isLambda() && "not a lambda");

  // C++2a [expr.prim.lambda.capture]p11:
  //   The closure type associated with a lambda-expression has no default
  //   constructor if the lambda-expression has a lambda-capture and a
  //   defaulted default constructor otherwise. It has a deleted copy
  //   assignment operator if the lambda-expression has a lambda-capture and
  //   defaulted copy and move assignment operators otherwise.
  //
  // C++17 [expr.prim.lambda]p21:
  //   The closure type associated with a lambda-expression has no default
  //   constructor and a deleted copy assignment operator.
  if (getLambdaCaptureDefault() != LCD_None || capture_size() != 0)
    return false;
  return getASTContext().getLangOpts().CPlusPlus20;
}

void CXXRecordDecl::addedMember(Decl *D) {
  if (!D->isImplicit() &&
      !isa<FieldDecl>(D) &&
      !isa<IndirectFieldDecl>(D) &&
      (!isa<TagDecl>(D) || cast<TagDecl>(D)->getTagKind() == TTK_Class ||
        cast<TagDecl>(D)->getTagKind() == TTK_Interface))
    data().HasOnlyCMembers = false;

  // Ignore friends and invalid declarations.
  if (D->getFriendObjectKind() || D->isInvalidDecl())
    return;

  auto *FunTmpl = dyn_cast<FunctionTemplateDecl>(D);
  if (FunTmpl)
    D = FunTmpl->getTemplatedDecl();

  // FIXME: Pass NamedDecl* to addedMember?
  Decl *DUnderlying = D;
  if (auto *ND = dyn_cast<NamedDecl>(DUnderlying)) {
    DUnderlying = ND->getUnderlyingDecl();
    if (auto *UnderlyingFunTmpl = dyn_cast<FunctionTemplateDecl>(DUnderlying))
      DUnderlying = UnderlyingFunTmpl->getTemplatedDecl();
  }

  if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
    if (Method->isVirtual()) {
      // C++ [dcl.init.aggr]p1:
      //   An aggregate is an array or a class with [...] no virtual functions.
      data().Aggregate = false;

      // C++ [class]p4:
      //   A POD-struct is an aggregate class...
      data().PlainOldData = false;

      // C++14 [meta.unary.prop]p4:
      //   T is a class type [...] with [...] no virtual member functions...
      data().Empty = false;

      // C++ [class.virtual]p1:
      //   A class that declares or inherits a virtual function is called a
      //   polymorphic class.
      data().Polymorphic = true;

      // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
      //   A [default constructor, copy/move constructor, or copy/move
      //   assignment operator for a class X] is trivial [...] if:
      //    -- class X has no virtual functions [...]
      data().HasTrivialSpecialMembers &= SMF_Destructor;
      data().HasTrivialSpecialMembersForCall &= SMF_Destructor;

      // C++0x [class]p7:
      //   A standard-layout class is a class that: [...]
      //    -- has no virtual functions
      data().IsStandardLayout = false;
      data().IsCXX11StandardLayout = false;
    }
  }

  // Notify the listener if an implicit member was added after the definition
  // was completed.
  if (!isBeingDefined() && D->isImplicit())
    if (ASTMutationListener *L = getASTMutationListener())
      L->AddedCXXImplicitMember(data().Definition, D);

  // The kind of special member this declaration is, if any.
  unsigned SMKind = 0;

  // Handle constructors.
  if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
    if (Constructor->isInheritingConstructor()) {
      // Ignore constructor shadow declarations. They are lazily created and
      // so shouldn't affect any properties of the class.
    } else {
      if (!Constructor->isImplicit()) {
        // Note that we have a user-declared constructor.
        data().UserDeclaredConstructor = true;

        const TargetInfo &TI = getASTContext().getTargetInfo();
        if ((!Constructor->isDeleted() && !Constructor->isDefaulted()) ||
            !TI.areDefaultedSMFStillPOD(getLangOpts())) {
          // C++ [class]p4:
          //   A POD-struct is an aggregate class [...]
          // Since the POD bit is meant to be C++03 POD-ness, clear it even if
          // the type is technically an aggregate in C++0x since it wouldn't be
          // in 03.
          data().PlainOldData = false;
        }
      }

      if (Constructor->isDefaultConstructor()) {
        SMKind |= SMF_DefaultConstructor;

        if (Constructor->isUserProvided())
          data().UserProvidedDefaultConstructor = true;
        if (Constructor->isConstexpr())
          data().HasConstexprDefaultConstructor = true;
        if (Constructor->isDefaulted())
          data().HasDefaultedDefaultConstructor = true;
      }

      if (!FunTmpl) {
        unsigned Quals;
        if (Constructor->isCopyConstructor(Quals)) {
          SMKind |= SMF_CopyConstructor;

          if (Quals & Qualifiers::Const)
            data().HasDeclaredCopyConstructorWithConstParam = true;
        } else if (Constructor->isMoveConstructor())
          SMKind |= SMF_MoveConstructor;
      }

      // C++11 [dcl.init.aggr]p1: DR1518
      //   An aggregate is an array or a class with no user-provided [or]
      //   explicit [...] constructors
      // C++20 [dcl.init.aggr]p1:
      //   An aggregate is an array or a class with no user-declared [...]
      //   constructors
      if (getASTContext().getLangOpts().CPlusPlus20
              ? !Constructor->isImplicit()
              : (Constructor->isUserProvided() || Constructor->isExplicit()))
        data().Aggregate = false;
    }
  }

  // Handle constructors, including those inherited from base classes.
  if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(DUnderlying)) {
    // Record if we see any constexpr constructors which are neither copy
    // nor move constructors.
    // C++1z [basic.types]p10:
    //   [...] has at least one constexpr constructor or constructor template
    //   (possibly inherited from a base class) that is not a copy or move
    //   constructor [...]
    if (Constructor->isConstexpr() && !Constructor->isCopyOrMoveConstructor())
      data().HasConstexprNonCopyMoveConstructor = true;
    if (!isa<CXXConstructorDecl>(D) && Constructor->isDefaultConstructor())
      data().HasInheritedDefaultConstructor = true;
  }

  // Handle member functions.
  if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
    if (isa<CXXDestructorDecl>(D))
      SMKind |= SMF_Destructor;

    if (Method->isCopyAssignmentOperator()) {
      SMKind |= SMF_CopyAssignment;

      const auto *ParamTy =
          Method->getParamDecl(0)->getType()->getAs<ReferenceType>();
      if (!ParamTy || ParamTy->getPointeeType().isConstQualified())
        data().HasDeclaredCopyAssignmentWithConstParam = true;
    }

    if (Method->isMoveAssignmentOperator())
      SMKind |= SMF_MoveAssignment;

    // Keep the list of conversion functions up-to-date.
    if (auto *Conversion = dyn_cast<CXXConversionDecl>(D)) {
      // FIXME: We use the 'unsafe' accessor for the access specifier here,
      // because Sema may not have set it yet. That's really just a misdesign
      // in Sema. However, LLDB *will* have set the access specifier correctly,
      // and adds declarations after the class is technically completed,
      // so completeDefinition()'s overriding of the access specifiers doesn't
      // work.
      AccessSpecifier AS = Conversion->getAccessUnsafe();

      if (Conversion->getPrimaryTemplate()) {
        // We don't record specializations.
      } else {
        ASTContext &Ctx = getASTContext();
        ASTUnresolvedSet &Conversions = data().Conversions.get(Ctx);
        NamedDecl *Primary =
            FunTmpl ? cast<NamedDecl>(FunTmpl) : cast<NamedDecl>(Conversion);
        if (Primary->getPreviousDecl())
          Conversions.replace(cast<NamedDecl>(Primary->getPreviousDecl()),
                              Primary, AS);
        else
          Conversions.addDecl(Ctx, Primary, AS);
      }
    }

    if (SMKind) {
      // If this is the first declaration of a special member, we no longer have
      // an implicit trivial special member.
      data().HasTrivialSpecialMembers &=
          data().DeclaredSpecialMembers | ~SMKind;
      data().HasTrivialSpecialMembersForCall &=
          data().DeclaredSpecialMembers | ~SMKind;

      // Note when we have declared a declared special member, and suppress the
      // implicit declaration of this special member.
      data().DeclaredSpecialMembers |= SMKind;
      if (!Method->isImplicit()) {
        data().UserDeclaredSpecialMembers |= SMKind;

        const TargetInfo &TI = getASTContext().getTargetInfo();
        if ((!Method->isDeleted() && !Method->isDefaulted() &&
             SMKind != SMF_MoveAssignment) ||
            !TI.areDefaultedSMFStillPOD(getLangOpts())) {
          // C++03 [class]p4:
          //   A POD-struct is an aggregate class that has [...] no user-defined
          //   copy assignment operator and no user-defined destructor.
          //
          // Since the POD bit is meant to be C++03 POD-ness, and in C++03,
          // aggregates could not have any constructors, clear it even for an
          // explicitly defaulted or deleted constructor.
          // type is technically an aggregate in C++0x since it wouldn't be in
          // 03.
          //
          // Also, a user-declared move assignment operator makes a class
          // non-POD. This is an extension in C++03.
          data().PlainOldData = false;
        }
      }
      // When instantiating a class, we delay updating the destructor and
      // triviality properties of the class until selecting a destructor and
      // computing the eligibility of its special member functions. This is
      // because there might be function constraints that we need to evaluate
      // and compare later in the instantiation.
      if (!Method->isIneligibleOrNotSelected()) {
        addedEligibleSpecialMemberFunction(Method, SMKind);
      }
    }

    return;
  }

  // Handle non-static data members.
  if (const auto *Field = dyn_cast<FieldDecl>(D)) {
    ASTContext &Context = getASTContext();

    // C++2a [class]p7:
    //   A standard-layout class is a class that:
    //    [...]
    //    -- has all non-static data members and bit-fields in the class and
    //       its base classes first declared in the same class
    if (data().HasBasesWithFields)
      data().IsStandardLayout = false;

    // C++ [class.bit]p2:
    //   A declaration for a bit-field that omits the identifier declares an
    //   unnamed bit-field. Unnamed bit-fields are not members and cannot be
    //   initialized.
    if (Field->isUnnamedBitfield()) {
      // C++ [meta.unary.prop]p4: [LWG2358]
      //   T is a class type [...] with [...] no unnamed bit-fields of non-zero
      //   length
      if (data().Empty && !Field->isZeroLengthBitField(Context) &&
          Context.getLangOpts().getClangABICompat() >
              LangOptions::ClangABI::Ver6)
        data().Empty = false;
      return;
    }

    // C++11 [class]p7:
    //   A standard-layout class is a class that:
    //    -- either has no non-static data members in the most derived class
    //       [...] or has no base classes with non-static data members
    if (data().HasBasesWithNonStaticDataMembers)
      data().IsCXX11StandardLayout = false;

    // C++ [dcl.init.aggr]p1:
    //   An aggregate is an array or a class (clause 9) with [...] no
    //   private or protected non-static data members (clause 11).
    //
    // A POD must be an aggregate.
    if (D->getAccess() == AS_private || D->getAccess() == AS_protected) {
      data().Aggregate = false;
      data().PlainOldData = false;

      // C++20 [temp.param]p7:
      //   A structural type is [...] a literal class type [for which] all
      //   non-static data members are public
      data().StructuralIfLiteral = false;
    }

    // Track whether this is the first field. We use this when checking
    // whether the class is standard-layout below.
    bool IsFirstField = !data().HasPrivateFields &&
                        !data().HasProtectedFields && !data().HasPublicFields;

    // C++0x [class]p7:
    //   A standard-layout class is a class that:
    //    [...]
    //    -- has the same access control for all non-static data members,
    switch (D->getAccess()) {
    case AS_private:    data().HasPrivateFields = true;   break;
    case AS_protected:  data().HasProtectedFields = true; break;
    case AS_public:     data().HasPublicFields = true;    break;
    case AS_none:       llvm_unreachable("Invalid access specifier");
    };
    if ((data().HasPrivateFields + data().HasProtectedFields +
         data().HasPublicFields) > 1) {
      data().IsStandardLayout = false;
      data().IsCXX11StandardLayout = false;
    }

    // Keep track of the presence of mutable fields.
    if (Field->isMutable()) {
      data().HasMutableFields = true;

      // C++20 [temp.param]p7:
      //   A structural type is [...] a literal class type [for which] all
      //   non-static data members are public
      data().StructuralIfLiteral = false;
    }

    // C++11 [class.union]p8, DR1460:
    //   If X is a union, a non-static data member of X that is not an anonymous
    //   union is a variant member of X.
    if (isUnion() && !Field->isAnonymousStructOrUnion())
      data().HasVariantMembers = true;

    // C++0x [class]p9:
    //   A POD struct is a class that is both a trivial class and a
    //   standard-layout class, and has no non-static data members of type
    //   non-POD struct, non-POD union (or array of such types).
    //
    // Automatic Reference Counting: the presence of a member of Objective-C pointer type
    // that does not explicitly have no lifetime makes the class a non-POD.
    QualType T = Context.getBaseElementType(Field->getType());
    if (T->isObjCRetainableType() || T.isObjCGCStrong()) {
      if (T.hasNonTrivialObjCLifetime()) {
        // Objective-C Automatic Reference Counting:
        //   If a class has a non-static data member of Objective-C pointer
        //   type (or array thereof), it is a non-POD type and its
        //   default constructor (if any), copy constructor, move constructor,
        //   copy assignment operator, move assignment operator, and destructor are
        //   non-trivial.
        setHasObjectMember(true);
        struct DefinitionData &Data = data();
        Data.PlainOldData = false;
        Data.HasTrivialSpecialMembers = 0;

        // __strong or __weak fields do not make special functions non-trivial
        // for the purpose of calls.
        Qualifiers::ObjCLifetime LT = T.getQualifiers().getObjCLifetime();
        if (LT != Qualifiers::OCL_Strong && LT != Qualifiers::OCL_Weak)
          data().HasTrivialSpecialMembersForCall = 0;

        // Structs with __weak fields should never be passed directly.
        if (LT == Qualifiers::OCL_Weak)
          setArgPassingRestrictions(RecordDecl::APK_CanNeverPassInRegs);

        Data.HasIrrelevantDestructor = false;

        if (isUnion()) {
          data().DefaultedCopyConstructorIsDeleted = true;
          data().DefaultedMoveConstructorIsDeleted = true;
          data().DefaultedCopyAssignmentIsDeleted = true;
          data().DefaultedMoveAssignmentIsDeleted = true;
          data().DefaultedDestructorIsDeleted = true;
          data().NeedOverloadResolutionForCopyConstructor = true;
          data().NeedOverloadResolutionForMoveConstructor = true;
          data().NeedOverloadResolutionForCopyAssignment = true;
          data().NeedOverloadResolutionForMoveAssignment = true;
          data().NeedOverloadResolutionForDestructor = true;
        }
      } else if (!Context.getLangOpts().ObjCAutoRefCount) {
        setHasObjectMember(true);
      }
    } else if (!T.isCXX98PODType(Context))
      data().PlainOldData = false;

    if (T->isReferenceType()) {
      if (!Field->hasInClassInitializer())
        data().HasUninitializedReferenceMember = true;

      // C++0x [class]p7:
      //   A standard-layout class is a class that:
      //    -- has no non-static data members of type [...] reference,
      data().IsStandardLayout = false;
      data().IsCXX11StandardLayout = false;

      // C++1z [class.copy.ctor]p10:
      //   A defaulted copy constructor for a class X is defined as deleted if X has:
      //    -- a non-static data member of rvalue reference type
      if (T->isRValueReferenceType())
        data().DefaultedCopyConstructorIsDeleted = true;
    }

    if (!Field->hasInClassInitializer() && !Field->isMutable()) {
      if (CXXRecordDecl *FieldType = T->getAsCXXRecordDecl()) {
        if (FieldType->hasDefinition() && !FieldType->allowConstDefaultInit())
          data().HasUninitializedFields = true;
      } else {
        data().HasUninitializedFields = true;
      }
    }

    // Record if this field is the first non-literal or volatile field or base.
    if (!T->isLiteralType(Context) || T.isVolatileQualified())
      data().HasNonLiteralTypeFieldsOrBases = true;

    if (Field->hasInClassInitializer() ||
        (Field->isAnonymousStructOrUnion() &&
         Field->getType()->getAsCXXRecordDecl()->hasInClassInitializer())) {
      data().HasInClassInitializer = true;

      // C++11 [class]p5:
      //   A default constructor is trivial if [...] no non-static data member
      //   of its class has a brace-or-equal-initializer.
      data().HasTrivialSpecialMembers &= ~SMF_DefaultConstructor;

      // C++11 [dcl.init.aggr]p1:
      //   An aggregate is a [...] class with [...] no
      //   brace-or-equal-initializers for non-static data members.
      //
      // This rule was removed in C++14.
      if (!getASTContext().getLangOpts().CPlusPlus14)
        data().Aggregate = false;

      // C++11 [class]p10:
      //   A POD struct is [...] a trivial class.
      data().PlainOldData = false;
    }

    // C++11 [class.copy]p23:
    //   A defaulted copy/move assignment operator for a class X is defined
    //   as deleted if X has:
    //    -- a non-static data member of reference type
    if (T->isReferenceType()) {
      data().DefaultedCopyAssignmentIsDeleted = true;
      data().DefaultedMoveAssignmentIsDeleted = true;
    }

    // Bitfields of length 0 are also zero-sized, but we already bailed out for
    // those because they are always unnamed.
    bool IsZeroSize = Field->isZeroSize(Context);

    if (const auto *RecordTy = T->getAs<RecordType>()) {
      auto *FieldRec = cast<CXXRecordDecl>(RecordTy->getDecl());
      if (FieldRec->getDefinition()) {
        addedClassSubobject(FieldRec);

        // We may need to perform overload resolution to determine whether a
        // field can be moved if it's const or volatile qualified.
        if (T.getCVRQualifiers() & (Qualifiers::Const | Qualifiers::Volatile)) {
          // We need to care about 'const' for the copy constructor because an
          // implicit copy constructor might be declared with a non-const
          // parameter.
          data().NeedOverloadResolutionForCopyConstructor = true;
          data().NeedOverloadResolutionForMoveConstructor = true;
          data().NeedOverloadResolutionForCopyAssignment = true;
          data().NeedOverloadResolutionForMoveAssignment = true;
        }

        // C++11 [class.ctor]p5, C++11 [class.copy]p11:
        //   A defaulted [special member] for a class X is defined as
        //   deleted if:
        //    -- X is a union-like class that has a variant member with a
        //       non-trivial [corresponding special member]
        if (isUnion()) {
          if (FieldRec->hasNonTrivialCopyConstructor())
            data().DefaultedCopyConstructorIsDeleted = true;
          if (FieldRec->hasNonTrivialMoveConstructor())
            data().DefaultedMoveConstructorIsDeleted = true;
          if (FieldRec->hasNonTrivialCopyAssignment())
            data().DefaultedCopyAssignmentIsDeleted = true;
          if (FieldRec->hasNonTrivialMoveAssignment())
            data().DefaultedMoveAssignmentIsDeleted = true;
          if (FieldRec->hasNonTrivialDestructor())
            data().DefaultedDestructorIsDeleted = true;
        }

        // For an anonymous union member, our overload resolution will perform
        // overload resolution for its members.
        if (Field->isAnonymousStructOrUnion()) {
          data().NeedOverloadResolutionForCopyConstructor |=
              FieldRec->data().NeedOverloadResolutionForCopyConstructor;
          data().NeedOverloadResolutionForMoveConstructor |=
              FieldRec->data().NeedOverloadResolutionForMoveConstructor;
          data().NeedOverloadResolutionForCopyAssignment |=
              FieldRec->data().NeedOverloadResolutionForCopyAssignment;
          data().NeedOverloadResolutionForMoveAssignment |=
              FieldRec->data().NeedOverloadResolutionForMoveAssignment;
          data().NeedOverloadResolutionForDestructor |=
              FieldRec->data().NeedOverloadResolutionForDestructor;
        }

        // C++0x [class.ctor]p5:
        //   A default constructor is trivial [...] if:
        //    -- for all the non-static data members of its class that are of
        //       class type (or array thereof), each such class has a trivial
        //       default constructor.
        if (!FieldRec->hasTrivialDefaultConstructor())
          data().HasTrivialSpecialMembers &= ~SMF_DefaultConstructor;

        // C++0x [class.copy]p13:
        //   A copy/move constructor for class X is trivial if [...]
        //    [...]
        //    -- for each non-static data member of X that is of class type (or
        //       an array thereof), the constructor selected to copy/move that
        //       member is trivial;
        if (!FieldRec->hasTrivialCopyConstructor())
          data().HasTrivialSpecialMembers &= ~SMF_CopyConstructor;

        if (!FieldRec->hasTrivialCopyConstructorForCall())
          data().HasTrivialSpecialMembersForCall &= ~SMF_CopyConstructor;

        // If the field doesn't have a simple move constructor, we'll eagerly
        // declare the move constructor for this class and we'll decide whether
        // it's trivial then.
        if (!FieldRec->hasTrivialMoveConstructor())
          data().HasTrivialSpecialMembers &= ~SMF_MoveConstructor;

        if (!FieldRec->hasTrivialMoveConstructorForCall())
          data().HasTrivialSpecialMembersForCall &= ~SMF_MoveConstructor;

        // C++0x [class.copy]p27:
        //   A copy/move assignment operator for class X is trivial if [...]
        //    [...]
        //    -- for each non-static data member of X that is of class type (or
        //       an array thereof), the assignment operator selected to
        //       copy/move that member is trivial;
        if (!FieldRec->hasTrivialCopyAssignment())
          data().HasTrivialSpecialMembers &= ~SMF_CopyAssignment;
        // If the field doesn't have a simple move assignment, we'll eagerly
        // declare the move assignment for this class and we'll decide whether
        // it's trivial then.
        if (!FieldRec->hasTrivialMoveAssignment())
          data().HasTrivialSpecialMembers &= ~SMF_MoveAssignment;

        if (!FieldRec->hasTrivialDestructor())
          data().HasTrivialSpecialMembers &= ~SMF_Destructor;
        if (!FieldRec->hasTrivialDestructorForCall())
          data().HasTrivialSpecialMembersForCall &= ~SMF_Destructor;
        if (!FieldRec->hasIrrelevantDestructor())
          data().HasIrrelevantDestructor = false;
        if (FieldRec->isAnyDestructorNoReturn())
          data().IsAnyDestructorNoReturn = true;
        if (FieldRec->hasObjectMember())
          setHasObjectMember(true);
        if (FieldRec->hasVolatileMember())
          setHasVolatileMember(true);
        if (FieldRec->getArgPassingRestrictions() ==
            RecordDecl::APK_CanNeverPassInRegs)
          setArgPassingRestrictions(RecordDecl::APK_CanNeverPassInRegs);

        // C++0x [class]p7:
        //   A standard-layout class is a class that:
        //    -- has no non-static data members of type non-standard-layout
        //       class (or array of such types) [...]
        if (!FieldRec->isStandardLayout())
          data().IsStandardLayout = false;
        if (!FieldRec->isCXX11StandardLayout())
          data().IsCXX11StandardLayout = false;

        // C++2a [class]p7:
        //   A standard-layout class is a class that:
        //    [...]
        //    -- has no element of the set M(S) of types as a base class.
        if (data().IsStandardLayout &&
            (isUnion() || IsFirstField || IsZeroSize) &&
            hasSubobjectAtOffsetZeroOfEmptyBaseType(Context, FieldRec))
          data().IsStandardLayout = false;

        // C++11 [class]p7:
        //   A standard-layout class is a class that:
        //    -- has no base classes of the same type as the first non-static
        //       data member
        if (data().IsCXX11StandardLayout && IsFirstField) {
          // FIXME: We should check all base classes here, not just direct
          // base classes.
          for (const auto &BI : bases()) {
            if (Context.hasSameUnqualifiedType(BI.getType(), T)) {
              data().IsCXX11StandardLayout = false;
              break;
            }
          }
        }

        // Keep track of the presence of mutable fields.
        if (FieldRec->hasMutableFields())
          data().HasMutableFields = true;

        if (Field->isMutable()) {
          // Our copy constructor/assignment might call something other than
          // the subobject's copy constructor/assignment if it's mutable and of
          // class type.
          data().NeedOverloadResolutionForCopyConstructor = true;
          data().NeedOverloadResolutionForCopyAssignment = true;
        }

        // C++11 [class.copy]p13:
        //   If the implicitly-defined constructor would satisfy the
        //   requirements of a constexpr constructor, the implicitly-defined
        //   constructor is constexpr.
        // C++11 [dcl.constexpr]p4:
        //    -- every constructor involved in initializing non-static data
        //       members [...] shall be a constexpr constructor
        if (!Field->hasInClassInitializer() &&
            !FieldRec->hasConstexprDefaultConstructor() && !isUnion())
          // The standard requires any in-class initializer to be a constant
          // expression. We consider this to be a defect.
          data().DefaultedDefaultConstructorIsConstexpr = false;

        // C++11 [class.copy]p8:
        //   The implicitly-declared copy constructor for a class X will have
        //   the form 'X::X(const X&)' if each potentially constructed subobject
        //   of a class type M (or array thereof) has a copy constructor whose
        //   first parameter is of type 'const M&' or 'const volatile M&'.
        if (!FieldRec->hasCopyConstructorWithConstParam())
          data().ImplicitCopyConstructorCanHaveConstParamForNonVBase = false;

        // C++11 [class.copy]p18:
        //   The implicitly-declared copy assignment oeprator for a class X will
        //   have the form 'X& X::operator=(const X&)' if [...] for all the
        //   non-static data members of X that are of a class type M (or array
        //   thereof), each such class type has a copy assignment operator whose
        //   parameter is of type 'const M&', 'const volatile M&' or 'M'.
        if (!FieldRec->hasCopyAssignmentWithConstParam())
          data().ImplicitCopyAssignmentHasConstParam = false;

        if (FieldRec->hasUninitializedReferenceMember() &&
            !Field->hasInClassInitializer())
          data().HasUninitializedReferenceMember = true;

        // C++11 [class.union]p8, DR1460:
        //   a non-static data member of an anonymous union that is a member of
        //   X is also a variant member of X.
        if (FieldRec->hasVariantMembers() &&
            Field->isAnonymousStructOrUnion())
          data().HasVariantMembers = true;
      }
    } else {
      // Base element type of field is a non-class type.
      if (!T->isLiteralType(Context) ||
          (!Field->hasInClassInitializer() && !isUnion() &&
           !Context.getLangOpts().CPlusPlus20))
        data().DefaultedDefaultConstructorIsConstexpr = false;

      // C++11 [class.copy]p23:
      //   A defaulted copy/move assignment operator for a class X is defined
      //   as deleted if X has:
      //    -- a non-static data member of const non-class type (or array
      //       thereof)
      if (T.isConstQualified()) {
        data().DefaultedCopyAssignmentIsDeleted = true;
        data().DefaultedMoveAssignmentIsDeleted = true;
      }

      // C++20 [temp.param]p7:
      //   A structural type is [...] a literal class type [for which] the
      //   types of all non-static data members are structural types or
      //   (possibly multidimensional) array thereof
      // We deal with class types elsewhere.
      if (!T->isStructuralType())
        data().StructuralIfLiteral = false;
    }

    // C++14 [meta.unary.prop]p4:
    //   T is a class type [...] with [...] no non-static data members other
    //   than subobjects of zero size
    if (data().Empty && !IsZeroSize)
      data().Empty = false;
  }

  // Handle using declarations of conversion functions.
  if (auto *Shadow = dyn_cast<UsingShadowDecl>(D)) {
    if (Shadow->getDeclName().getNameKind()
          == DeclarationName::CXXConversionFunctionName) {
      ASTContext &Ctx = getASTContext();
      data().Conversions.get(Ctx).addDecl(Ctx, Shadow, Shadow->getAccess());
    }
  }

  if (const auto *Using = dyn_cast<UsingDecl>(D)) {
    if (Using->getDeclName().getNameKind() ==
        DeclarationName::CXXConstructorName) {
      data().HasInheritedConstructor = true;
      // C++1z [dcl.init.aggr]p1:
      //  An aggregate is [...] a class [...] with no inherited constructors
      data().Aggregate = false;
    }

    if (Using->getDeclName().getCXXOverloadedOperator() == OO_Equal)
      data().HasInheritedAssignment = true;
  }
}

void CXXRecordDecl::addedSelectedDestructor(CXXDestructorDecl *DD) {
  DD->setIneligibleOrNotSelected(false);
  addedEligibleSpecialMemberFunction(DD, SMF_Destructor);
}

void CXXRecordDecl::addedEligibleSpecialMemberFunction(const CXXMethodDecl *MD,
                                                       unsigned SMKind) {
  // FIXME: We shouldn't change DeclaredNonTrivialSpecialMembers if `MD` is
  // a function template, but this needs CWG attention before we break ABI.
  // See https://github.com/llvm/llvm-project/issues/59206

  if (const auto *DD = dyn_cast<CXXDestructorDecl>(MD)) {
    if (DD->isUserProvided())
      data().HasIrrelevantDestructor = false;
    // If the destructor is explicitly defaulted and not trivial or not public
    // or if the destructor is deleted, we clear HasIrrelevantDestructor in
    // finishedDefaultedOrDeletedMember.

    // C++11 [class.dtor]p5:
    //   A destructor is trivial if [...] the destructor is not virtual.
    if (DD->isVirtual()) {
      data().HasTrivialSpecialMembers &= ~SMF_Destructor;
      data().HasTrivialSpecialMembersForCall &= ~SMF_Destructor;
    }

    if (DD->isNoReturn())
      data().IsAnyDestructorNoReturn = true;
  }

  if (!MD->isImplicit() && !MD->isUserProvided()) {
    // This method is user-declared but not user-provided. We can't work
    // out whether it's trivial yet (not until we get to the end of the
    // class). We'll handle this method in
    // finishedDefaultedOrDeletedMember.
  } else if (MD->isTrivial()) {
    data().HasTrivialSpecialMembers |= SMKind;
    data().HasTrivialSpecialMembersForCall |= SMKind;
  } else if (MD->isTrivialForCall()) {
    data().HasTrivialSpecialMembersForCall |= SMKind;
    data().DeclaredNonTrivialSpecialMembers |= SMKind;
  } else {
    data().DeclaredNonTrivialSpecialMembers |= SMKind;
    // If this is a user-provided function, do not set
    // DeclaredNonTrivialSpecialMembersForCall here since we don't know
    // yet whether the method would be considered non-trivial for the
    // purpose of calls (attribute "trivial_abi" can be dropped from the
    // class later, which can change the special method's triviality).
    if (!MD->isUserProvided())
      data().DeclaredNonTrivialSpecialMembersForCall |= SMKind;
  }
}

void CXXRecordDecl::finishedDefaultedOrDeletedMember(CXXMethodDecl *D) {
  assert(!D->isImplicit() && !D->isUserProvided());

  // The kind of special member this declaration is, if any.
  unsigned SMKind = 0;

  if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
    if (Constructor->isDefaultConstructor()) {
      SMKind |= SMF_DefaultConstructor;
      if (Constructor->isConstexpr())
        data().HasConstexprDefaultConstructor = true;
    }
    if (Constructor->isCopyConstructor())
      SMKind |= SMF_CopyConstructor;
    else if (Constructor->isMoveConstructor())
      SMKind |= SMF_MoveConstructor;
    else if (Constructor->isConstexpr())
      // We may now know that the constructor is constexpr.
      data().HasConstexprNonCopyMoveConstructor = true;
  } else if (isa<CXXDestructorDecl>(D)) {
    SMKind |= SMF_Destructor;
    if (!D->isTrivial() || D->getAccess() != AS_public || D->isDeleted())
      data().HasIrrelevantDestructor = false;
  } else if (D->isCopyAssignmentOperator())
    SMKind |= SMF_CopyAssignment;
  else if (D->isMoveAssignmentOperator())
    SMKind |= SMF_MoveAssignment;

  // Update which trivial / non-trivial special members we have.
  // addedMember will have skipped this step for this member.
  if (!D->isIneligibleOrNotSelected()) {
    if (D->isTrivial())
      data().HasTrivialSpecialMembers |= SMKind;
    else
      data().DeclaredNonTrivialSpecialMembers |= SMKind;
  }
}

void CXXRecordDecl::LambdaDefinitionData::AddCaptureList(ASTContext &Ctx,
                                                         Capture *CaptureList) {
  Captures.push_back(CaptureList);
  if (Captures.size() == 2) {
    // The TinyPtrVector member now needs destruction.
    Ctx.addDestruction(&Captures);
  }
}

void CXXRecordDecl::setCaptures(ASTContext &Context,
                                ArrayRef<LambdaCapture> Captures) {
  CXXRecordDecl::LambdaDefinitionData &Data = getLambdaData();

  // Copy captures.
  Data.NumCaptures = Captures.size();
  Data.NumExplicitCaptures = 0;
  auto *ToCapture = (LambdaCapture *)Context.Allocate(sizeof(LambdaCapture) *
                                                      Captures.size());
  Data.AddCaptureList(Context, ToCapture);
  for (unsigned I = 0, N = Captures.size(); I != N; ++I) {
    if (Captures[I].isExplicit())
      ++Data.NumExplicitCaptures;

    *ToCapture++ = Captures[I];
  }

  if (!lambdaIsDefaultConstructibleAndAssignable())
    Data.DefaultedCopyAssignmentIsDeleted = true;
}

void CXXRecordDecl::setTrivialForCallFlags(CXXMethodDecl *D) {
  unsigned SMKind = 0;

  if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
    if (Constructor->isCopyConstructor())
      SMKind = SMF_CopyConstructor;
    else if (Constructor->isMoveConstructor())
      SMKind = SMF_MoveConstructor;
  } else if (isa<CXXDestructorDecl>(D))
    SMKind = SMF_Destructor;

  if (D->isTrivialForCall())
    data().HasTrivialSpecialMembersForCall |= SMKind;
  else
    data().DeclaredNonTrivialSpecialMembersForCall |= SMKind;
}

bool CXXRecordDecl::isCLike() const {
  if (getTagKind() == TTK_Class || getTagKind() == TTK_Interface ||
      !TemplateOrInstantiation.isNull())
    return false;
  if (!hasDefinition())
    return true;

  return isPOD() && data().HasOnlyCMembers;
}

bool CXXRecordDecl::isGenericLambda() const {
  if (!isLambda()) return false;
  return getLambdaData().IsGenericLambda;
}

#ifndef NDEBUG
static bool allLookupResultsAreTheSame(const DeclContext::lookup_result &R) {
  for (auto *D : R)
    if (!declaresSameEntity(D, R.front()))
      return false;
  return true;
}
#endif

static NamedDecl* getLambdaCallOperatorHelper(const CXXRecordDecl &RD) {
  if (!RD.isLambda()) return nullptr;
  DeclarationName Name =
    RD.getASTContext().DeclarationNames.getCXXOperatorName(OO_Call);
  DeclContext::lookup_result Calls = RD.lookup(Name);

  assert(!Calls.empty() && "Missing lambda call operator!");
  assert(allLookupResultsAreTheSame(Calls) &&
         "More than one lambda call operator!");
  return Calls.front();
}

FunctionTemplateDecl* CXXRecordDecl::getDependentLambdaCallOperator() const {
  NamedDecl *CallOp = getLambdaCallOperatorHelper(*this);
  return  dyn_cast_or_null<FunctionTemplateDecl>(CallOp);
}

CXXMethodDecl *CXXRecordDecl::getLambdaCallOperator() const {
  NamedDecl *CallOp = getLambdaCallOperatorHelper(*this);

  if (CallOp == nullptr)
    return nullptr;

  if (const auto *CallOpTmpl = dyn_cast<FunctionTemplateDecl>(CallOp))
    return cast<CXXMethodDecl>(CallOpTmpl->getTemplatedDecl());

  return cast<CXXMethodDecl>(CallOp);
}

CXXMethodDecl* CXXRecordDecl::getLambdaStaticInvoker() const {
  CXXMethodDecl *CallOp = getLambdaCallOperator();
  CallingConv CC = CallOp->getType()->castAs<FunctionType>()->getCallConv();
  return getLambdaStaticInvoker(CC);
}

static DeclContext::lookup_result
getLambdaStaticInvokers(const CXXRecordDecl &RD) {
  assert(RD.isLambda() && "Must be a lambda");
  DeclarationName Name =
      &RD.getASTContext().Idents.get(getLambdaStaticInvokerName());
  return RD.lookup(Name);
}

static CXXMethodDecl *getInvokerAsMethod(NamedDecl *ND) {
  if (const auto *InvokerTemplate = dyn_cast<FunctionTemplateDecl>(ND))
    return cast<CXXMethodDecl>(InvokerTemplate->getTemplatedDecl());
  return cast<CXXMethodDecl>(ND);
}

CXXMethodDecl *CXXRecordDecl::getLambdaStaticInvoker(CallingConv CC) const {
  if (!isLambda())
    return nullptr;
  DeclContext::lookup_result Invoker = getLambdaStaticInvokers(*this);

  for (NamedDecl *ND : Invoker) {
    const auto *FTy =
        cast<ValueDecl>(ND->getAsFunction())->getType()->castAs<FunctionType>();
    if (FTy->getCallConv() == CC)
      return getInvokerAsMethod(ND);
  }

  return nullptr;
}

void CXXRecordDecl::getCaptureFields(
    llvm::DenseMap<const ValueDecl *, FieldDecl *> &Captures,
    FieldDecl *&ThisCapture) const {
  Captures.clear();
  ThisCapture = nullptr;

  LambdaDefinitionData &Lambda = getLambdaData();
  for (const LambdaCapture *List : Lambda.Captures) {
    RecordDecl::field_iterator Field = field_begin();
    for (const LambdaCapture *C = List, *CEnd = C + Lambda.NumCaptures;
         C != CEnd; ++C, ++Field) {
      if (C->capturesThis())
        ThisCapture = *Field;
      else if (C->capturesVariable())
        Captures[C->getCapturedVar()] = *Field;
    }
    assert(Field == field_end());
  }
}

TemplateParameterList *
CXXRecordDecl::getGenericLambdaTemplateParameterList() const {
  if (!isGenericLambda()) return nullptr;
  CXXMethodDecl *CallOp = getLambdaCallOperator();
  if (FunctionTemplateDecl *Tmpl = CallOp->getDescribedFunctionTemplate())
    return Tmpl->getTemplateParameters();
  return nullptr;
}

ArrayRef<NamedDecl *>
CXXRecordDecl::getLambdaExplicitTemplateParameters() const {
  TemplateParameterList *List = getGenericLambdaTemplateParameterList();
  if (!List)
    return {};

  assert(std::is_partitioned(List->begin(), List->end(),
                             [](const NamedDecl *D) { return !D->isImplicit(); })
         && "Explicit template params should be ordered before implicit ones");

  const auto ExplicitEnd = llvm::partition_point(
      *List, [](const NamedDecl *D) { return !D->isImplicit(); });
  return llvm::ArrayRef(List->begin(), ExplicitEnd);
}

Decl *CXXRecordDecl::getLambdaContextDecl() const {
  assert(isLambda() && "Not a lambda closure type!");
  ExternalASTSource *Source = getParentASTContext().getExternalSource();
  return getLambdaData().ContextDecl.get(Source);
}

void CXXRecordDecl::setDeviceLambdaManglingNumber(unsigned Num) const {
  assert(isLambda() && "Not a lambda closure type!");
  if (Num)
    getASTContext().DeviceLambdaManglingNumbers[this] = Num;
}

unsigned CXXRecordDecl::getDeviceLambdaManglingNumber() const {
  assert(isLambda() && "Not a lambda closure type!");
  auto I = getASTContext().DeviceLambdaManglingNumbers.find(this);
  if (I != getASTContext().DeviceLambdaManglingNumbers.end())
    return I->second;
  return 0;
}

static CanQualType GetConversionType(ASTContext &Context, NamedDecl *Conv) {
  QualType T =
      cast<CXXConversionDecl>(Conv->getUnderlyingDecl()->getAsFunction())
          ->getConversionType();
  return Context.getCanonicalType(T);
}

/// Collect the visible conversions of a base class.
///
/// \param Record a base class of the class we're considering
/// \param InVirtual whether this base class is a virtual base (or a base
///   of a virtual base)
/// \param Access the access along the inheritance path to this base
/// \param ParentHiddenTypes the conversions provided by the inheritors
///   of this base
/// \param Output the set to which to add conversions from non-virtual bases
/// \param VOutput the set to which to add conversions from virtual bases
/// \param HiddenVBaseCs the set of conversions which were hidden in a
///   virtual base along some inheritance path
static void CollectVisibleConversions(
    ASTContext &Context, const CXXRecordDecl *Record, bool InVirtual,
    AccessSpecifier Access,
    const llvm::SmallPtrSet<CanQualType, 8> &ParentHiddenTypes,
    ASTUnresolvedSet &Output, UnresolvedSetImpl &VOutput,
    llvm::SmallPtrSet<NamedDecl *, 8> &HiddenVBaseCs) {
  // The set of types which have conversions in this class or its
  // subclasses.  As an optimization, we don't copy the derived set
  // unless it might change.
  const llvm::SmallPtrSet<CanQualType, 8> *HiddenTypes = &ParentHiddenTypes;
  llvm::SmallPtrSet<CanQualType, 8> HiddenTypesBuffer;

  // Collect the direct conversions and figure out which conversions
  // will be hidden in the subclasses.
  CXXRecordDecl::conversion_iterator ConvI = Record->conversion_begin();
  CXXRecordDecl::conversion_iterator ConvE = Record->conversion_end();
  if (ConvI != ConvE) {
    HiddenTypesBuffer = ParentHiddenTypes;
    HiddenTypes = &HiddenTypesBuffer;

    for (CXXRecordDecl::conversion_iterator I = ConvI; I != ConvE; ++I) {
      CanQualType ConvType(GetConversionType(Context, I.getDecl()));
      bool Hidden = ParentHiddenTypes.count(ConvType);
      if (!Hidden)
        HiddenTypesBuffer.insert(ConvType);

      // If this conversion is hidden and we're in a virtual base,
      // remember that it's hidden along some inheritance path.
      if (Hidden && InVirtual)
        HiddenVBaseCs.insert(cast<NamedDecl>(I.getDecl()->getCanonicalDecl()));

      // If this conversion isn't hidden, add it to the appropriate output.
      else if (!Hidden) {
        AccessSpecifier IAccess
          = CXXRecordDecl::MergeAccess(Access, I.getAccess());

        if (InVirtual)
          VOutput.addDecl(I.getDecl(), IAccess);
        else
          Output.addDecl(Context, I.getDecl(), IAccess);
      }
    }
  }

  // Collect information recursively from any base classes.
  for (const auto &I : Record->bases()) {
    const auto *RT = I.getType()->getAs<RecordType>();
    if (!RT) continue;

    AccessSpecifier BaseAccess
      = CXXRecordDecl::MergeAccess(Access, I.getAccessSpecifier());
    bool BaseInVirtual = InVirtual || I.isVirtual();

    auto *Base = cast<CXXRecordDecl>(RT->getDecl());
    CollectVisibleConversions(Context, Base, BaseInVirtual, BaseAccess,
                              *HiddenTypes, Output, VOutput, HiddenVBaseCs);
  }
}

/// Collect the visible conversions of a class.
///
/// This would be extremely straightforward if it weren't for virtual
/// bases.  It might be worth special-casing that, really.
static void CollectVisibleConversions(ASTContext &Context,
                                      const CXXRecordDecl *Record,
                                      ASTUnresolvedSet &Output) {
  // The collection of all conversions in virtual bases that we've
  // found.  These will be added to the output as long as they don't
  // appear in the hidden-conversions set.
  UnresolvedSet<8> VBaseCs;

  // The set of conversions in virtual bases that we've determined to
  // be hidden.
  llvm::SmallPtrSet<NamedDecl*, 8> HiddenVBaseCs;

  // The set of types hidden by classes derived from this one.
  llvm::SmallPtrSet<CanQualType, 8> HiddenTypes;

  // Go ahead and collect the direct conversions and add them to the
  // hidden-types set.
  CXXRecordDecl::conversion_iterator ConvI = Record->conversion_begin();
  CXXRecordDecl::conversion_iterator ConvE = Record->conversion_end();
  Output.append(Context, ConvI, ConvE);
  for (; ConvI != ConvE; ++ConvI)
    HiddenTypes.insert(GetConversionType(Context, ConvI.getDecl()));

  // Recursively collect conversions from base classes.
  for (const auto &I : Record->bases()) {
    const auto *RT = I.getType()->getAs<RecordType>();
    if (!RT) continue;

    CollectVisibleConversions(Context, cast<CXXRecordDecl>(RT->getDecl()),
                              I.isVirtual(), I.getAccessSpecifier(),
                              HiddenTypes, Output, VBaseCs, HiddenVBaseCs);
  }

  // Add any unhidden conversions provided by virtual bases.
  for (UnresolvedSetIterator I = VBaseCs.begin(), E = VBaseCs.end();
         I != E; ++I) {
    if (!HiddenVBaseCs.count(cast<NamedDecl>(I.getDecl()->getCanonicalDecl())))
      Output.addDecl(Context, I.getDecl(), I.getAccess());
  }
}

/// getVisibleConversionFunctions - get all conversion functions visible
/// in current class; including conversion function templates.
llvm::iterator_range<CXXRecordDecl::conversion_iterator>
CXXRecordDecl::getVisibleConversionFunctions() const {
  ASTContext &Ctx = getASTContext();

  ASTUnresolvedSet *Set;
  if (bases_begin() == bases_end()) {
    // If root class, all conversions are visible.
    Set = &data().Conversions.get(Ctx);
  } else {
    Set = &data().VisibleConversions.get(Ctx);
    // If visible conversion list is not evaluated, evaluate it.
    if (!data().ComputedVisibleConversions) {
      CollectVisibleConversions(Ctx, this, *Set);
      data().ComputedVisibleConversions = true;
    }
  }
  return llvm::make_range(Set->begin(), Set->end());
}

void CXXRecordDecl::removeConversion(const NamedDecl *ConvDecl) {
  // This operation is O(N) but extremely rare.  Sema only uses it to
  // remove UsingShadowDecls in a class that were followed by a direct
  // declaration, e.g.:
  //   class A : B {
  //     using B::operator int;
  //     operator int();
  //   };
  // This is uncommon by itself and even more uncommon in conjunction
  // with sufficiently large numbers of directly-declared conversions
  // that asymptotic behavior matters.

  ASTUnresolvedSet &Convs = data().Conversions.get(getASTContext());
  for (unsigned I = 0, E = Convs.size(); I != E; ++I) {
    if (Convs[I].getDecl() == ConvDecl) {
      Convs.erase(I);
      assert(!llvm::is_contained(Convs, ConvDecl) &&
             "conversion was found multiple times in unresolved set");
      return;
    }
  }

  llvm_unreachable("conversion not found in set!");
}

CXXRecordDecl *CXXRecordDecl::getInstantiatedFromMemberClass() const {
  if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo())
    return cast<CXXRecordDecl>(MSInfo->getInstantiatedFrom());

  return nullptr;
}

MemberSpecializationInfo *CXXRecordDecl::getMemberSpecializationInfo() const {
  return TemplateOrInstantiation.dyn_cast<MemberSpecializationInfo *>();
}

void
CXXRecordDecl::setInstantiationOfMemberClass(CXXRecordDecl *RD,
                                             TemplateSpecializationKind TSK) {
  assert(TemplateOrInstantiation.isNull() &&
         "Previous template or instantiation?");
  assert(!isa<ClassTemplatePartialSpecializationDecl>(this));
  TemplateOrInstantiation
    = new (getASTContext()) MemberSpecializationInfo(RD, TSK);
}

ClassTemplateDecl *CXXRecordDecl::getDescribedClassTemplate() const {
  return TemplateOrInstantiation.dyn_cast<ClassTemplateDecl *>();
}

void CXXRecordDecl::setDescribedClassTemplate(ClassTemplateDecl *Template) {
  TemplateOrInstantiation = Template;
}

TemplateSpecializationKind CXXRecordDecl::getTemplateSpecializationKind() const{
  if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(this))
    return Spec->getSpecializationKind();

  if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo())
    return MSInfo->getTemplateSpecializationKind();

  return TSK_Undeclared;
}

void
CXXRecordDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK) {
  if (auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(this)) {
    Spec->setSpecializationKind(TSK);
    return;
  }

  if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
    MSInfo->setTemplateSpecializationKind(TSK);
    return;
  }

  llvm_unreachable("Not a class template or member class specialization");
}

const CXXRecordDecl *CXXRecordDecl::getTemplateInstantiationPattern() const {
  auto GetDefinitionOrSelf =
      [](const CXXRecordDecl *D) -> const CXXRecordDecl * {
    if (auto *Def = D->getDefinition())
      return Def;
    return D;
  };

  // If it's a class template specialization, find the template or partial
  // specialization from which it was instantiated.
  if (auto *TD = dyn_cast<ClassTemplateSpecializationDecl>(this)) {
    auto From = TD->getInstantiatedFrom();
    if (auto *CTD = From.dyn_cast<ClassTemplateDecl *>()) {
      while (auto *NewCTD = CTD->getInstantiatedFromMemberTemplate()) {
        if (NewCTD->isMemberSpecialization())
          break;
        CTD = NewCTD;
      }
      return GetDefinitionOrSelf(CTD->getTemplatedDecl());
    }
    if (auto *CTPSD =
            From.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) {
      while (auto *NewCTPSD = CTPSD->getInstantiatedFromMember()) {
        if (NewCTPSD->isMemberSpecialization())
          break;
        CTPSD = NewCTPSD;
      }
      return GetDefinitionOrSelf(CTPSD);
    }
  }

  if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
    if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
      const CXXRecordDecl *RD = this;
      while (auto *NewRD = RD->getInstantiatedFromMemberClass())
        RD = NewRD;
      return GetDefinitionOrSelf(RD);
    }
  }

  assert(!isTemplateInstantiation(this->getTemplateSpecializationKind()) &&
         "couldn't find pattern for class template instantiation");
  return nullptr;
}

CXXDestructorDecl *CXXRecordDecl::getDestructor() const {
  ASTContext &Context = getASTContext();
  QualType ClassType = Context.getTypeDeclType(this);

  DeclarationName Name
    = Context.DeclarationNames.getCXXDestructorName(
                                          Context.getCanonicalType(ClassType));

  DeclContext::lookup_result R = lookup(Name);

  // If a destructor was marked as not selected, we skip it. We don't always
  // have a selected destructor: dependent types, unnamed structs.
  for (auto *Decl : R) {
    auto* DD = dyn_cast<CXXDestructorDecl>(Decl);
    if (DD && !DD->isIneligibleOrNotSelected())
      return DD;
  }
  return nullptr;
}

static bool isDeclContextInNamespace(const DeclContext *DC) {
  while (!DC->isTranslationUnit()) {
    if (DC->isNamespace())
      return true;
    DC = DC->getParent();
  }
  return false;
}

bool CXXRecordDecl::isInterfaceLike() const {
  assert(hasDefinition() && "checking for interface-like without a definition");
  // All __interfaces are inheritently interface-like.
  if (isInterface())
    return true;

  // Interface-like types cannot have a user declared constructor, destructor,
  // friends, VBases, conversion functions, or fields.  Additionally, lambdas
  // cannot be interface types.
  if (isLambda() || hasUserDeclaredConstructor() ||
      hasUserDeclaredDestructor() || !field_empty() || hasFriends() ||
      getNumVBases() > 0 || conversion_end() - conversion_begin() > 0)
    return false;

  // No interface-like type can have a method with a definition.
  for (const auto *const Method : methods())
    if (Method->isDefined() && !Method->isImplicit())
      return false;

  // Check "Special" types.
  const auto *Uuid = getAttr<UuidAttr>();
  // MS SDK declares IUnknown/IDispatch both in the root of a TU, or in an
  // extern C++ block directly in the TU.  These are only valid if in one
  // of these two situations.
  if (Uuid && isStruct() && !getDeclContext()->isExternCContext() &&
      !isDeclContextInNamespace(getDeclContext()) &&
      ((getName() == "IUnknown" &&
        Uuid->getGuid() == "00000000-0000-0000-C000-000000000046") ||
       (getName() == "IDispatch" &&
        Uuid->getGuid() == "00020400-0000-0000-C000-000000000046"))) {
    if (getNumBases() > 0)
      return false;
    return true;
  }

  // FIXME: Any access specifiers is supposed to make this no longer interface
  // like.

  // If this isn't a 'special' type, it must have a single interface-like base.
  if (getNumBases() != 1)
    return false;

  const auto BaseSpec = *bases_begin();
  if (BaseSpec.isVirtual() || BaseSpec.getAccessSpecifier() != AS_public)
    return false;
  const auto *Base = BaseSpec.getType()->getAsCXXRecordDecl();
  if (Base->isInterface() || !Base->isInterfaceLike())
    return false;
  return true;
}

void CXXRecordDecl::completeDefinition() {
  completeDefinition(nullptr);
}

void CXXRecordDecl::completeDefinition(CXXFinalOverriderMap *FinalOverriders) {
  RecordDecl::completeDefinition();

  // If the class may be abstract (but hasn't been marked as such), check for
  // any pure final overriders.
  if (mayBeAbstract()) {
    CXXFinalOverriderMap MyFinalOverriders;
    if (!FinalOverriders) {
      getFinalOverriders(MyFinalOverriders);
      FinalOverriders = &MyFinalOverriders;
    }

    bool Done = false;
    for (CXXFinalOverriderMap::iterator M = FinalOverriders->begin(),
                                     MEnd = FinalOverriders->end();
         M != MEnd && !Done; ++M) {
      for (OverridingMethods::iterator SO = M->second.begin(),
                                    SOEnd = M->second.end();
           SO != SOEnd && !Done; ++SO) {
        assert(SO->second.size() > 0 &&
               "All virtual functions have overriding virtual functions");

        // C++ [class.abstract]p4:
        //   A class is abstract if it contains or inherits at least one
        //   pure virtual function for which the final overrider is pure
        //   virtual.
        if (SO->second.front().Method->isPure()) {
          data().Abstract = true;
          Done = true;
          break;
        }
      }
    }
  }

  // Set access bits correctly on the directly-declared conversions.
  for (conversion_iterator I = conversion_begin(), E = conversion_end();
       I != E; ++I)
    I.setAccess((*I)->getAccess());
}

bool CXXRecordDecl::mayBeAbstract() const {
  if (data().Abstract || isInvalidDecl() || !data().Polymorphic ||
      isDependentContext())
    return false;

  for (const auto &B : bases()) {
    const auto *BaseDecl =
        cast<CXXRecordDecl>(B.getType()->castAs<RecordType>()->getDecl());
    if (BaseDecl->isAbstract())
      return true;
  }

  return false;
}

bool CXXRecordDecl::isEffectivelyFinal() const {
  auto *Def = getDefinition();
  if (!Def)
    return false;
  if (Def->hasAttr<FinalAttr>())
    return true;
  if (const auto *Dtor = Def->getDestructor())
    if (Dtor->hasAttr<FinalAttr>())
      return true;
  return false;
}

void CXXDeductionGuideDecl::anchor() {}

bool ExplicitSpecifier::isEquivalent(const ExplicitSpecifier Other) const {
  if ((getKind() != Other.getKind() ||
       getKind() == ExplicitSpecKind::Unresolved)) {
    if (getKind() == ExplicitSpecKind::Unresolved &&
        Other.getKind() == ExplicitSpecKind::Unresolved) {
      ODRHash SelfHash, OtherHash;
      SelfHash.AddStmt(getExpr());
      OtherHash.AddStmt(Other.getExpr());
      return SelfHash.CalculateHash() == OtherHash.CalculateHash();
    } else
      return false;
  }
  return true;
}

ExplicitSpecifier ExplicitSpecifier::getFromDecl(FunctionDecl *Function) {
  switch (Function->getDeclKind()) {
  case Decl::Kind::CXXConstructor:
    return cast<CXXConstructorDecl>(Function)->getExplicitSpecifier();
  case Decl::Kind::CXXConversion:
    return cast<CXXConversionDecl>(Function)->getExplicitSpecifier();
  case Decl::Kind::CXXDeductionGuide:
    return cast<CXXDeductionGuideDecl>(Function)->getExplicitSpecifier();
  default:
    return {};
  }
}

CXXDeductionGuideDecl *
CXXDeductionGuideDecl::Create(ASTContext &C, DeclContext *DC,
                              SourceLocation StartLoc, ExplicitSpecifier ES,
                              const DeclarationNameInfo &NameInfo, QualType T,
                              TypeSourceInfo *TInfo, SourceLocation EndLocation,
                              CXXConstructorDecl *Ctor) {
  return new (C, DC) CXXDeductionGuideDecl(C, DC, StartLoc, ES, NameInfo, T,
                                           TInfo, EndLocation, Ctor);
}

CXXDeductionGuideDecl *CXXDeductionGuideDecl::CreateDeserialized(ASTContext &C,
                                                                 unsigned ID) {
  return new (C, ID) CXXDeductionGuideDecl(
      C, nullptr, SourceLocation(), ExplicitSpecifier(), DeclarationNameInfo(),
      QualType(), nullptr, SourceLocation(), nullptr);
}

RequiresExprBodyDecl *RequiresExprBodyDecl::Create(
    ASTContext &C, DeclContext *DC, SourceLocation StartLoc) {
  return new (C, DC) RequiresExprBodyDecl(C, DC, StartLoc);
}

RequiresExprBodyDecl *RequiresExprBodyDecl::CreateDeserialized(ASTContext &C,
                                                               unsigned ID) {
  return new (C, ID) RequiresExprBodyDecl(C, nullptr, SourceLocation());
}

void CXXMethodDecl::anchor() {}

bool CXXMethodDecl::isStatic() const {
  const CXXMethodDecl *MD = getCanonicalDecl();

  if (MD->getStorageClass() == SC_Static)
    return true;

  OverloadedOperatorKind OOK = getDeclName().getCXXOverloadedOperator();
  return isStaticOverloadedOperator(OOK);
}

static bool recursivelyOverrides(const CXXMethodDecl *DerivedMD,
                                 const CXXMethodDecl *BaseMD) {
  for (const CXXMethodDecl *MD : DerivedMD->overridden_methods()) {
    if (MD->getCanonicalDecl() == BaseMD->getCanonicalDecl())
      return true;
    if (recursivelyOverrides(MD, BaseMD))
      return true;
  }
  return false;
}

CXXMethodDecl *
CXXMethodDecl::getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD,
                                                     bool MayBeBase) {
  if (this->getParent()->getCanonicalDecl() == RD->getCanonicalDecl())
    return this;

  // Lookup doesn't work for destructors, so handle them separately.
  if (isa<CXXDestructorDecl>(this)) {
    CXXMethodDecl *MD = RD->getDestructor();
    if (MD) {
      if (recursivelyOverrides(MD, this))
        return MD;
      if (MayBeBase && recursivelyOverrides(this, MD))
        return MD;
    }
    return nullptr;
  }

  for (auto *ND : RD->lookup(getDeclName())) {
    auto *MD = dyn_cast<CXXMethodDecl>(ND);
    if (!MD)
      continue;
    if (recursivelyOverrides(MD, this))
      return MD;
    if (MayBeBase && recursivelyOverrides(this, MD))
      return MD;
  }

  return nullptr;
}

CXXMethodDecl *
CXXMethodDecl::getCorrespondingMethodInClass(const CXXRecordDecl *RD,
                                             bool MayBeBase) {
  if (auto *MD = getCorrespondingMethodDeclaredInClass(RD, MayBeBase))
    return MD;

  llvm::SmallVector<CXXMethodDecl*, 4> FinalOverriders;
  auto AddFinalOverrider = [&](CXXMethodDecl *D) {
    // If this function is overridden by a candidate final overrider, it is not
    // a final overrider.
    for (CXXMethodDecl *OtherD : FinalOverriders) {
      if (declaresSameEntity(D, OtherD) || recursivelyOverrides(OtherD, D))
        return;
    }

    // Other candidate final overriders might be overridden by this function.
    llvm::erase_if(FinalOverriders, [&](CXXMethodDecl *OtherD) {
      return recursivelyOverrides(D, OtherD);
    });

    FinalOverriders.push_back(D);
  };

  for (const auto &I : RD->bases()) {
    const RecordType *RT = I.getType()->getAs<RecordType>();
    if (!RT)
      continue;
    const auto *Base = cast<CXXRecordDecl>(RT->getDecl());
    if (CXXMethodDecl *D = this->getCorrespondingMethodInClass(Base))
      AddFinalOverrider(D);
  }

  return FinalOverriders.size() == 1 ? FinalOverriders.front() : nullptr;
}

CXXMethodDecl *
CXXMethodDecl::Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
                      const DeclarationNameInfo &NameInfo, QualType T,
                      TypeSourceInfo *TInfo, StorageClass SC, bool UsesFPIntrin,
                      bool isInline, ConstexprSpecKind ConstexprKind,
                      SourceLocation EndLocation,
                      Expr *TrailingRequiresClause) {
  return new (C, RD) CXXMethodDecl(
      CXXMethod, C, RD, StartLoc, NameInfo, T, TInfo, SC, UsesFPIntrin,
      isInline, ConstexprKind, EndLocation, TrailingRequiresClause);
}

CXXMethodDecl *CXXMethodDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) CXXMethodDecl(
      CXXMethod, C, nullptr, SourceLocation(), DeclarationNameInfo(),
      QualType(), nullptr, SC_None, false, false,
      ConstexprSpecKind::Unspecified, SourceLocation(), nullptr);
}

CXXMethodDecl *CXXMethodDecl::getDevirtualizedMethod(const Expr *Base,
                                                     bool IsAppleKext) {
  assert(isVirtual() && "this method is expected to be virtual");

  // When building with -fapple-kext, all calls must go through the vtable since
  // the kernel linker can do runtime patching of vtables.
  if (IsAppleKext)
    return nullptr;

  // If the member function is marked 'final', we know that it can't be
  // overridden and can therefore devirtualize it unless it's pure virtual.
  if (hasAttr<FinalAttr>())
    return isPure() ? nullptr : this;

  // If Base is unknown, we cannot devirtualize.
  if (!Base)
    return nullptr;

  // If the base expression (after skipping derived-to-base conversions) is a
  // class prvalue, then we can devirtualize.
  Base = Base->getBestDynamicClassTypeExpr();
  if (Base->isPRValue() && Base->getType()->isRecordType())
    return this;

  // If we don't even know what we would call, we can't devirtualize.
  const CXXRecordDecl *BestDynamicDecl = Base->getBestDynamicClassType();
  if (!BestDynamicDecl)
    return nullptr;

  // There may be a method corresponding to MD in a derived class.
  CXXMethodDecl *DevirtualizedMethod =
      getCorrespondingMethodInClass(BestDynamicDecl);

  // If there final overrider in the dynamic type is ambiguous, we can't
  // devirtualize this call.
  if (!DevirtualizedMethod)
    return nullptr;

  // If that method is pure virtual, we can't devirtualize. If this code is
  // reached, the result would be UB, not a direct call to the derived class
  // function, and we can't assume the derived class function is defined.
  if (DevirtualizedMethod->isPure())
    return nullptr;

  // If that method is marked final, we can devirtualize it.
  if (DevirtualizedMethod->hasAttr<FinalAttr>())
    return DevirtualizedMethod;

  // Similarly, if the class itself or its destructor is marked 'final',
  // the class can't be derived from and we can therefore devirtualize the
  // member function call.
  if (BestDynamicDecl->isEffectivelyFinal())
    return DevirtualizedMethod;

  if (const auto *DRE = dyn_cast<DeclRefExpr>(Base)) {
    if (const auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
      if (VD->getType()->isRecordType())
        // This is a record decl. We know the type and can devirtualize it.
        return DevirtualizedMethod;

    return nullptr;
  }

  // We can devirtualize calls on an object accessed by a class member access
  // expression, since by C++11 [basic.life]p6 we know that it can't refer to
  // a derived class object constructed in the same location.
  if (const auto *ME = dyn_cast<MemberExpr>(Base)) {
    const ValueDecl *VD = ME->getMemberDecl();
    return VD->getType()->isRecordType() ? DevirtualizedMethod : nullptr;
  }

  // Likewise for calls on an object accessed by a (non-reference) pointer to
  // member access.
  if (auto *BO = dyn_cast<BinaryOperator>(Base)) {
    if (BO->isPtrMemOp()) {
      auto *MPT = BO->getRHS()->getType()->castAs<MemberPointerType>();
      if (MPT->getPointeeType()->isRecordType())
        return DevirtualizedMethod;
    }
  }

  // We can't devirtualize the call.
  return nullptr;
}

bool CXXMethodDecl::isUsualDeallocationFunction(
    SmallVectorImpl<const FunctionDecl *> &PreventedBy) const {
  assert(PreventedBy.empty() && "PreventedBy is expected to be empty");
  if (getOverloadedOperator() != OO_Delete &&
      getOverloadedOperator() != OO_Array_Delete)
    return false;

  // C++ [basic.stc.dynamic.deallocation]p2:
  //   A template instance is never a usual deallocation function,
  //   regardless of its signature.
  if (getPrimaryTemplate())
    return false;

  // C++ [basic.stc.dynamic.deallocation]p2:
  //   If a class T has a member deallocation function named operator delete
  //   with exactly one parameter, then that function is a usual (non-placement)
  //   deallocation function. [...]
  if (getNumParams() == 1)
    return true;
  unsigned UsualParams = 1;

  // C++ P0722:
  //   A destroying operator delete is a usual deallocation function if
  //   removing the std::destroying_delete_t parameter and changing the
  //   first parameter type from T* to void* results in the signature of
  //   a usual deallocation function.
  if (isDestroyingOperatorDelete())
    ++UsualParams;

  // C++ <=14 [basic.stc.dynamic.deallocation]p2:
  //   [...] If class T does not declare such an operator delete but does
  //   declare a member deallocation function named operator delete with
  //   exactly two parameters, the second of which has type std::size_t (18.1),
  //   then this function is a usual deallocation function.
  //
  // C++17 says a usual deallocation function is one with the signature
  //   (void* [, size_t] [, std::align_val_t] [, ...])
  // and all such functions are usual deallocation functions. It's not clear
  // that allowing varargs functions was intentional.
  ASTContext &Context = getASTContext();
  if (UsualParams < getNumParams() &&
      Context.hasSameUnqualifiedType(getParamDecl(UsualParams)->getType(),
                                     Context.getSizeType()))
    ++UsualParams;

  if (UsualParams < getNumParams() &&
      getParamDecl(UsualParams)->getType()->isAlignValT())
    ++UsualParams;

  if (UsualParams != getNumParams())
    return false;

  // In C++17 onwards, all potential usual deallocation functions are actual
  // usual deallocation functions. Honor this behavior when post-C++14
  // deallocation functions are offered as extensions too.
  // FIXME(EricWF): Destroying Delete should be a language option. How do we
  // handle when destroying delete is used prior to C++17?
  if (Context.getLangOpts().CPlusPlus17 ||
      Context.getLangOpts().AlignedAllocation ||
      isDestroyingOperatorDelete())
    return true;

  // This function is a usual deallocation function if there are no
  // single-parameter deallocation functions of the same kind.
  DeclContext::lookup_result R = getDeclContext()->lookup(getDeclName());
  bool Result = true;
  for (const auto *D : R) {
    if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
      if (FD->getNumParams() == 1) {
        PreventedBy.push_back(FD);
        Result = false;
      }
    }
  }
  return Result;
}

bool CXXMethodDecl::isCopyAssignmentOperator() const {
  // C++0x [class.copy]p17:
  //  A user-declared copy assignment operator X::operator= is a non-static
  //  non-template member function of class X with exactly one parameter of
  //  type X, X&, const X&, volatile X& or const volatile X&.
  if (/*operator=*/getOverloadedOperator() != OO_Equal ||
      /*non-static*/ isStatic() ||
      /*non-template*/getPrimaryTemplate() || getDescribedFunctionTemplate() ||
      getNumParams() != 1)
    return false;

  QualType ParamType = getParamDecl(0)->getType();
  if (const auto *Ref = ParamType->getAs<LValueReferenceType>())
    ParamType = Ref->getPointeeType();

  ASTContext &Context = getASTContext();
  QualType ClassType
    = Context.getCanonicalType(Context.getTypeDeclType(getParent()));
  return Context.hasSameUnqualifiedType(ClassType, ParamType);
}

bool CXXMethodDecl::isMoveAssignmentOperator() const {
  // C++0x [class.copy]p19:
  //  A user-declared move assignment operator X::operator= is a non-static
  //  non-template member function of class X with exactly one parameter of type
  //  X&&, const X&&, volatile X&&, or const volatile X&&.
  if (getOverloadedOperator() != OO_Equal || isStatic() ||
      getPrimaryTemplate() || getDescribedFunctionTemplate() ||
      getNumParams() != 1)
    return false;

  QualType ParamType = getParamDecl(0)->getType();
  if (!ParamType->isRValueReferenceType())
    return false;
  ParamType = ParamType->getPointeeType();

  ASTContext &Context = getASTContext();
  QualType ClassType
    = Context.getCanonicalType(Context.getTypeDeclType(getParent()));
  return Context.hasSameUnqualifiedType(ClassType, ParamType);
}

void CXXMethodDecl::addOverriddenMethod(const CXXMethodDecl *MD) {
  assert(MD->isCanonicalDecl() && "Method is not canonical!");
  assert(!MD->getParent()->isDependentContext() &&
         "Can't add an overridden method to a class template!");
  assert(MD->isVirtual() && "Method is not virtual!");

  getASTContext().addOverriddenMethod(this, MD);
}

CXXMethodDecl::method_iterator CXXMethodDecl::begin_overridden_methods() const {
  if (isa<CXXConstructorDecl>(this)) return nullptr;
  return getASTContext().overridden_methods_begin(this);
}

CXXMethodDecl::method_iterator CXXMethodDecl::end_overridden_methods() const {
  if (isa<CXXConstructorDecl>(this)) return nullptr;
  return getASTContext().overridden_methods_end(this);
}

unsigned CXXMethodDecl::size_overridden_methods() const {
  if (isa<CXXConstructorDecl>(this)) return 0;
  return getASTContext().overridden_methods_size(this);
}

CXXMethodDecl::overridden_method_range
CXXMethodDecl::overridden_methods() const {
  if (isa<CXXConstructorDecl>(this))
    return overridden_method_range(nullptr, nullptr);
  return getASTContext().overridden_methods(this);
}

static QualType getThisObjectType(ASTContext &C, const FunctionProtoType *FPT,
                                  const CXXRecordDecl *Decl) {
  QualType ClassTy = C.getTypeDeclType(Decl);
  return C.getQualifiedType(ClassTy, FPT->getMethodQuals());
}

QualType CXXMethodDecl::getThisType(const FunctionProtoType *FPT,
                                    const CXXRecordDecl *Decl) {
  ASTContext &C = Decl->getASTContext();
  QualType ObjectTy = ::getThisObjectType(C, FPT, Decl);
  return C.getPointerType(ObjectTy);
}

QualType CXXMethodDecl::getThisObjectType(const FunctionProtoType *FPT,
                                          const CXXRecordDecl *Decl) {
  ASTContext &C = Decl->getASTContext();
  return ::getThisObjectType(C, FPT, Decl);
}

QualType CXXMethodDecl::getThisType() const {
  // C++ 9.3.2p1: The type of this in a member function of a class X is X*.
  // If the member function is declared const, the type of this is const X*,
  // if the member function is declared volatile, the type of this is
  // volatile X*, and if the member function is declared const volatile,
  // the type of this is const volatile X*.
  assert(isInstance() && "No 'this' for static methods!");
  return CXXMethodDecl::getThisType(getType()->castAs<FunctionProtoType>(),
                                    getParent());
}

QualType CXXMethodDecl::getThisObjectType() const {
  // Ditto getThisType.
  assert(isInstance() && "No 'this' for static methods!");
  return CXXMethodDecl::getThisObjectType(
      getType()->castAs<FunctionProtoType>(), getParent());
}

bool CXXMethodDecl::hasInlineBody() const {
  // If this function is a template instantiation, look at the template from
  // which it was instantiated.
  const FunctionDecl *CheckFn = getTemplateInstantiationPattern();
  if (!CheckFn)
    CheckFn = this;

  const FunctionDecl *fn;
  return CheckFn->isDefined(fn) && !fn->isOutOfLine() &&
         (fn->doesThisDeclarationHaveABody() || fn->willHaveBody());
}

bool CXXMethodDecl::isLambdaStaticInvoker() const {
  const CXXRecordDecl *P = getParent();
  return P->isLambda() && getDeclName().isIdentifier() &&
         getName() == getLambdaStaticInvokerName();
}

CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context,
                                       TypeSourceInfo *TInfo, bool IsVirtual,
                                       SourceLocation L, Expr *Init,
                                       SourceLocation R,
                                       SourceLocation EllipsisLoc)
    : Initializee(TInfo), Init(Init), MemberOrEllipsisLocation(EllipsisLoc),
      LParenLoc(L), RParenLoc(R), IsDelegating(false), IsVirtual(IsVirtual),
      IsWritten(false), SourceOrder(0) {}

CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context, FieldDecl *Member,
                                       SourceLocation MemberLoc,
                                       SourceLocation L, Expr *Init,
                                       SourceLocation R)
    : Initializee(Member), Init(Init), MemberOrEllipsisLocation(MemberLoc),
      LParenLoc(L), RParenLoc(R), IsDelegating(false), IsVirtual(false),
      IsWritten(false), SourceOrder(0) {}

CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context,
                                       IndirectFieldDecl *Member,
                                       SourceLocation MemberLoc,
                                       SourceLocation L, Expr *Init,
                                       SourceLocation R)
    : Initializee(Member), Init(Init), MemberOrEllipsisLocation(MemberLoc),
      LParenLoc(L), RParenLoc(R), IsDelegating(false), IsVirtual(false),
      IsWritten(false), SourceOrder(0) {}

CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context,
                                       TypeSourceInfo *TInfo,
                                       SourceLocation L, Expr *Init,
                                       SourceLocation R)
    : Initializee(TInfo), Init(Init), LParenLoc(L), RParenLoc(R),
      IsDelegating(true), IsVirtual(false), IsWritten(false), SourceOrder(0) {}

int64_t CXXCtorInitializer::getID(const ASTContext &Context) const {
  return Context.getAllocator()
                .identifyKnownAlignedObject<CXXCtorInitializer>(this);
}

TypeLoc CXXCtorInitializer::getBaseClassLoc() const {
  if (isBaseInitializer())
    return Initializee.get<TypeSourceInfo*>()->getTypeLoc();
  else
    return {};
}

const Type *CXXCtorInitializer::getBaseClass() const {
  if (isBaseInitializer())
    return Initializee.get<TypeSourceInfo*>()->getType().getTypePtr();
  else
    return nullptr;
}

SourceLocation CXXCtorInitializer::getSourceLocation() const {
  if (isInClassMemberInitializer())
    return getAnyMember()->getLocation();

  if (isAnyMemberInitializer())
    return getMemberLocation();

  if (const auto *TSInfo = Initializee.get<TypeSourceInfo *>())
    return TSInfo->getTypeLoc().getBeginLoc();

  return {};
}

SourceRange CXXCtorInitializer::getSourceRange() const {
  if (isInClassMemberInitializer()) {
    FieldDecl *D = getAnyMember();
    if (Expr *I = D->getInClassInitializer())
      return I->getSourceRange();
    return {};
  }

  return SourceRange(getSourceLocation(), getRParenLoc());
}

CXXConstructorDecl::CXXConstructorDecl(
    ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
    const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
    ExplicitSpecifier ES, bool UsesFPIntrin, bool isInline,
    bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind,
    InheritedConstructor Inherited, Expr *TrailingRequiresClause)
    : CXXMethodDecl(CXXConstructor, C, RD, StartLoc, NameInfo, T, TInfo,
                    SC_None, UsesFPIntrin, isInline, ConstexprKind,
                    SourceLocation(), TrailingRequiresClause) {
  setNumCtorInitializers(0);
  setInheritingConstructor(static_cast<bool>(Inherited));
  setImplicit(isImplicitlyDeclared);
  CXXConstructorDeclBits.HasTrailingExplicitSpecifier = ES.getExpr() ? 1 : 0;
  if (Inherited)
    *getTrailingObjects<InheritedConstructor>() = Inherited;
  setExplicitSpecifier(ES);
}

void CXXConstructorDecl::anchor() {}

CXXConstructorDecl *CXXConstructorDecl::CreateDeserialized(ASTContext &C,
                                                           unsigned ID,
                                                           uint64_t AllocKind) {
  bool hasTrailingExplicit = static_cast<bool>(AllocKind & TAKHasTailExplicit);
  bool isInheritingConstructor =
      static_cast<bool>(AllocKind & TAKInheritsConstructor);
  unsigned Extra =
      additionalSizeToAlloc<InheritedConstructor, ExplicitSpecifier>(
          isInheritingConstructor, hasTrailingExplicit);
  auto *Result = new (C, ID, Extra) CXXConstructorDecl(
      C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
      ExplicitSpecifier(), false, false, false, ConstexprSpecKind::Unspecified,
      InheritedConstructor(), nullptr);
  Result->setInheritingConstructor(isInheritingConstructor);
  Result->CXXConstructorDeclBits.HasTrailingExplicitSpecifier =
      hasTrailingExplicit;
  Result->setExplicitSpecifier(ExplicitSpecifier());
  return Result;
}

CXXConstructorDecl *CXXConstructorDecl::Create(
    ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
    const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
    ExplicitSpecifier ES, bool UsesFPIntrin, bool isInline,
    bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind,
    InheritedConstructor Inherited, Expr *TrailingRequiresClause) {
  assert(NameInfo.getName().getNameKind()
         == DeclarationName::CXXConstructorName &&
         "Name must refer to a constructor");
  unsigned Extra =
      additionalSizeToAlloc<InheritedConstructor, ExplicitSpecifier>(
          Inherited ? 1 : 0, ES.getExpr() ? 1 : 0);
  return new (C, RD, Extra) CXXConstructorDecl(
      C, RD, StartLoc, NameInfo, T, TInfo, ES, UsesFPIntrin, isInline,
      isImplicitlyDeclared, ConstexprKind, Inherited, TrailingRequiresClause);
}

CXXConstructorDecl::init_const_iterator CXXConstructorDecl::init_begin() const {
  return CtorInitializers.get(getASTContext().getExternalSource());
}

CXXConstructorDecl *CXXConstructorDecl::getTargetConstructor() const {
  assert(isDelegatingConstructor() && "Not a delegating constructor!");
  Expr *E = (*init_begin())->getInit()->IgnoreImplicit();
  if (const auto *Construct = dyn_cast<CXXConstructExpr>(E))
    return Construct->getConstructor();

  return nullptr;
}

bool CXXConstructorDecl::isDefaultConstructor() const {
  // C++ [class.default.ctor]p1:
  //   A default constructor for a class X is a constructor of class X for
  //   which each parameter that is not a function parameter pack has a default
  //   argument (including the case of a constructor with no parameters)
  return getMinRequiredArguments() == 0;
}

bool
CXXConstructorDecl::isCopyConstructor(unsigned &TypeQuals) const {
  return isCopyOrMoveConstructor(TypeQuals) &&
         getParamDecl(0)->getType()->isLValueReferenceType();
}

bool CXXConstructorDecl::isMoveConstructor(unsigned &TypeQuals) const {
  return isCopyOrMoveConstructor(TypeQuals) &&
         getParamDecl(0)->getType()->isRValueReferenceType();
}

/// Determine whether this is a copy or move constructor.
bool CXXConstructorDecl::isCopyOrMoveConstructor(unsigned &TypeQuals) const {
  // C++ [class.copy]p2:
  //   A non-template constructor for class X is a copy constructor
  //   if its first parameter is of type X&, const X&, volatile X& or
  //   const volatile X&, and either there are no other parameters
  //   or else all other parameters have default arguments (8.3.6).
  // C++0x [class.copy]p3:
  //   A non-template constructor for class X is a move constructor if its
  //   first parameter is of type X&&, const X&&, volatile X&&, or
  //   const volatile X&&, and either there are no other parameters or else
  //   all other parameters have default arguments.
  if (!hasOneParamOrDefaultArgs() || getPrimaryTemplate() != nullptr ||
      getDescribedFunctionTemplate() != nullptr)
    return false;

  const ParmVarDecl *Param = getParamDecl(0);

  // Do we have a reference type?
  const auto *ParamRefType = Param->getType()->getAs<ReferenceType>();
  if (!ParamRefType)
    return false;

  // Is it a reference to our class type?
  ASTContext &Context = getASTContext();

  CanQualType PointeeType
    = Context.getCanonicalType(ParamRefType->getPointeeType());
  CanQualType ClassTy
    = Context.getCanonicalType(Context.getTagDeclType(getParent()));
  if (PointeeType.getUnqualifiedType() != ClassTy)
    return false;

  // FIXME: other qualifiers?

  // We have a copy or move constructor.
  TypeQuals = PointeeType.getCVRQualifiers();
  return true;
}

bool CXXConstructorDecl::isConvertingConstructor(bool AllowExplicit) const {
  // C++ [class.conv.ctor]p1:
  //   A constructor declared without the function-specifier explicit
  //   that can be called with a single parameter specifies a
  //   conversion from the type of its first parameter to the type of
  //   its class. Such a constructor is called a converting
  //   constructor.
  if (isExplicit() && !AllowExplicit)
    return false;

  // FIXME: This has nothing to do with the definition of converting
  // constructor, but is convenient for how we use this function in overload
  // resolution.
  return getNumParams() == 0
             ? getType()->castAs<FunctionProtoType>()->isVariadic()
             : getMinRequiredArguments() <= 1;
}

bool CXXConstructorDecl::isSpecializationCopyingObject() const {
  if (!hasOneParamOrDefaultArgs() || getDescribedFunctionTemplate() != nullptr)
    return false;

  const ParmVarDecl *Param = getParamDecl(0);

  ASTContext &Context = getASTContext();
  CanQualType ParamType = Context.getCanonicalType(Param->getType());

  // Is it the same as our class type?
  CanQualType ClassTy
    = Context.getCanonicalType(Context.getTagDeclType(getParent()));
  if (ParamType.getUnqualifiedType() != ClassTy)
    return false;

  return true;
}

void CXXDestructorDecl::anchor() {}

CXXDestructorDecl *
CXXDestructorDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) CXXDestructorDecl(
      C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
      false, false, false, ConstexprSpecKind::Unspecified, nullptr);
}

CXXDestructorDecl *CXXDestructorDecl::Create(
    ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
    const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
    bool UsesFPIntrin, bool isInline, bool isImplicitlyDeclared,
    ConstexprSpecKind ConstexprKind, Expr *TrailingRequiresClause) {
  assert(NameInfo.getName().getNameKind()
         == DeclarationName::CXXDestructorName &&
         "Name must refer to a destructor");
  return new (C, RD) CXXDestructorDecl(
      C, RD, StartLoc, NameInfo, T, TInfo, UsesFPIntrin, isInline,
      isImplicitlyDeclared, ConstexprKind, TrailingRequiresClause);
}

void CXXDestructorDecl::setOperatorDelete(FunctionDecl *OD, Expr *ThisArg) {
  auto *First = cast<CXXDestructorDecl>(getFirstDecl());
  if (OD && !First->OperatorDelete) {
    First->OperatorDelete = OD;
    First->OperatorDeleteThisArg = ThisArg;
    if (auto *L = getASTMutationListener())
      L->ResolvedOperatorDelete(First, OD, ThisArg);
  }
}

void CXXConversionDecl::anchor() {}

CXXConversionDecl *
CXXConversionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) CXXConversionDecl(
      C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
      false, false, ExplicitSpecifier(), ConstexprSpecKind::Unspecified,
      SourceLocation(), nullptr);
}

CXXConversionDecl *CXXConversionDecl::Create(
    ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
    const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
    bool UsesFPIntrin, bool isInline, ExplicitSpecifier ES,
    ConstexprSpecKind ConstexprKind, SourceLocation EndLocation,
    Expr *TrailingRequiresClause) {
  assert(NameInfo.getName().getNameKind()
         == DeclarationName::CXXConversionFunctionName &&
         "Name must refer to a conversion function");
  return new (C, RD) CXXConversionDecl(
      C, RD, StartLoc, NameInfo, T, TInfo, UsesFPIntrin, isInline, ES,
      ConstexprKind, EndLocation, TrailingRequiresClause);
}

bool CXXConversionDecl::isLambdaToBlockPointerConversion() const {
  return isImplicit() && getParent()->isLambda() &&
         getConversionType()->isBlockPointerType();
}

LinkageSpecDecl::LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc,
                                 SourceLocation LangLoc, LanguageIDs lang,
                                 bool HasBraces)
    : Decl(LinkageSpec, DC, LangLoc), DeclContext(LinkageSpec),
      ExternLoc(ExternLoc), RBraceLoc(SourceLocation()) {
  setLanguage(lang);
  LinkageSpecDeclBits.HasBraces = HasBraces;
}

void LinkageSpecDecl::anchor() {}

LinkageSpecDecl *LinkageSpecDecl::Create(ASTContext &C,
                                         DeclContext *DC,
                                         SourceLocation ExternLoc,
                                         SourceLocation LangLoc,
                                         LanguageIDs Lang,
                                         bool HasBraces) {
  return new (C, DC) LinkageSpecDecl(DC, ExternLoc, LangLoc, Lang, HasBraces);
}

LinkageSpecDecl *LinkageSpecDecl::CreateDeserialized(ASTContext &C,
                                                     unsigned ID) {
  return new (C, ID) LinkageSpecDecl(nullptr, SourceLocation(),
                                     SourceLocation(), lang_c, false);
}

void UsingDirectiveDecl::anchor() {}

UsingDirectiveDecl *UsingDirectiveDecl::Create(ASTContext &C, DeclContext *DC,
                                               SourceLocation L,
                                               SourceLocation NamespaceLoc,
                                           NestedNameSpecifierLoc QualifierLoc,
                                               SourceLocation IdentLoc,
                                               NamedDecl *Used,
                                               DeclContext *CommonAncestor) {
  if (auto *NS = dyn_cast_or_null<NamespaceDecl>(Used))
    Used = NS->getOriginalNamespace();
  return new (C, DC) UsingDirectiveDecl(DC, L, NamespaceLoc, QualifierLoc,
                                        IdentLoc, Used, CommonAncestor);
}

UsingDirectiveDecl *UsingDirectiveDecl::CreateDeserialized(ASTContext &C,
                                                           unsigned ID) {
  return new (C, ID) UsingDirectiveDecl(nullptr, SourceLocation(),
                                        SourceLocation(),
                                        NestedNameSpecifierLoc(),
                                        SourceLocation(), nullptr, nullptr);
}

NamespaceDecl *UsingDirectiveDecl::getNominatedNamespace() {
  if (auto *NA = dyn_cast_or_null<NamespaceAliasDecl>(NominatedNamespace))
    return NA->getNamespace();
  return cast_or_null<NamespaceDecl>(NominatedNamespace);
}

NamespaceDecl::NamespaceDecl(ASTContext &C, DeclContext *DC, bool Inline,
                             SourceLocation StartLoc, SourceLocation IdLoc,
                             IdentifierInfo *Id, NamespaceDecl *PrevDecl,
                             bool Nested)
    : NamedDecl(Namespace, DC, IdLoc, Id), DeclContext(Namespace),
      redeclarable_base(C), LocStart(StartLoc) {
  unsigned Flags = 0;
  if (Inline)
    Flags |= F_Inline;
  if (Nested)
    Flags |= F_Nested;
  AnonOrFirstNamespaceAndFlags = {nullptr, Flags};
  setPreviousDecl(PrevDecl);

  if (PrevDecl)
    AnonOrFirstNamespaceAndFlags.setPointer(PrevDecl->getOriginalNamespace());
}

NamespaceDecl *NamespaceDecl::Create(ASTContext &C, DeclContext *DC,
                                     bool Inline, SourceLocation StartLoc,
                                     SourceLocation IdLoc, IdentifierInfo *Id,
                                     NamespaceDecl *PrevDecl, bool Nested) {
  return new (C, DC)
      NamespaceDecl(C, DC, Inline, StartLoc, IdLoc, Id, PrevDecl, Nested);
}

NamespaceDecl *NamespaceDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) NamespaceDecl(C, nullptr, false, SourceLocation(),
                                   SourceLocation(), nullptr, nullptr, false);
}

NamespaceDecl *NamespaceDecl::getOriginalNamespace() {
  if (isFirstDecl())
    return this;

  return AnonOrFirstNamespaceAndFlags.getPointer();
}

const NamespaceDecl *NamespaceDecl::getOriginalNamespace() const {
  if (isFirstDecl())
    return this;

  return AnonOrFirstNamespaceAndFlags.getPointer();
}

bool NamespaceDecl::isOriginalNamespace() const { return isFirstDecl(); }

NamespaceDecl *NamespaceDecl::getNextRedeclarationImpl() {
  return getNextRedeclaration();
}

NamespaceDecl *NamespaceDecl::getPreviousDeclImpl() {
  return getPreviousDecl();
}

NamespaceDecl *NamespaceDecl::getMostRecentDeclImpl() {
  return getMostRecentDecl();
}

void NamespaceAliasDecl::anchor() {}

NamespaceAliasDecl *NamespaceAliasDecl::getNextRedeclarationImpl() {
  return getNextRedeclaration();
}

NamespaceAliasDecl *NamespaceAliasDecl::getPreviousDeclImpl() {
  return getPreviousDecl();
}

NamespaceAliasDecl *NamespaceAliasDecl::getMostRecentDeclImpl() {
  return getMostRecentDecl();
}

NamespaceAliasDecl *NamespaceAliasDecl::Create(ASTContext &C, DeclContext *DC,
                                               SourceLocation UsingLoc,
                                               SourceLocation AliasLoc,
                                               IdentifierInfo *Alias,
                                           NestedNameSpecifierLoc QualifierLoc,
                                               SourceLocation IdentLoc,
                                               NamedDecl *Namespace) {
  // FIXME: Preserve the aliased namespace as written.
  if (auto *NS = dyn_cast_or_null<NamespaceDecl>(Namespace))
    Namespace = NS->getOriginalNamespace();
  return new (C, DC) NamespaceAliasDecl(C, DC, UsingLoc, AliasLoc, Alias,
                                        QualifierLoc, IdentLoc, Namespace);
}

NamespaceAliasDecl *
NamespaceAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) NamespaceAliasDecl(C, nullptr, SourceLocation(),
                                        SourceLocation(), nullptr,
                                        NestedNameSpecifierLoc(),
                                        SourceLocation(), nullptr);
}

void LifetimeExtendedTemporaryDecl::anchor() {}

/// Retrieve the storage duration for the materialized temporary.
StorageDuration LifetimeExtendedTemporaryDecl::getStorageDuration() const {
  const ValueDecl *ExtendingDecl = getExtendingDecl();
  if (!ExtendingDecl)
    return SD_FullExpression;
  // FIXME: This is not necessarily correct for a temporary materialized
  // within a default initializer.
  if (isa<FieldDecl>(ExtendingDecl))
    return SD_Automatic;
  // FIXME: This only works because storage class specifiers are not allowed
  // on decomposition declarations.
  if (isa<BindingDecl>(ExtendingDecl))
    return ExtendingDecl->getDeclContext()->isFunctionOrMethod() ? SD_Automatic
                                                                 : SD_Static;
  return cast<VarDecl>(ExtendingDecl)->getStorageDuration();
}

APValue *LifetimeExtendedTemporaryDecl::getOrCreateValue(bool MayCreate) const {
  assert(getStorageDuration() == SD_Static &&
         "don't need to cache the computed value for this temporary");
  if (MayCreate && !Value) {
    Value = (new (getASTContext()) APValue);
    getASTContext().addDestruction(Value);
  }
  assert(Value && "may not be null");
  return Value;
}

void UsingShadowDecl::anchor() {}

UsingShadowDecl::UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC,
                                 SourceLocation Loc, DeclarationName Name,
                                 BaseUsingDecl *Introducer, NamedDecl *Target)
    : NamedDecl(K, DC, Loc, Name), redeclarable_base(C),
      UsingOrNextShadow(Introducer) {
  if (Target) {
    assert(!isa<UsingShadowDecl>(Target));
    setTargetDecl(Target);
  }
  setImplicit();
}

UsingShadowDecl::UsingShadowDecl(Kind K, ASTContext &C, EmptyShell Empty)
    : NamedDecl(K, nullptr, SourceLocation(), DeclarationName()),
      redeclarable_base(C) {}

UsingShadowDecl *
UsingShadowDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) UsingShadowDecl(UsingShadow, C, EmptyShell());
}

BaseUsingDecl *UsingShadowDecl::getIntroducer() const {
  const UsingShadowDecl *Shadow = this;
  while (const auto *NextShadow =
             dyn_cast<UsingShadowDecl>(Shadow->UsingOrNextShadow))
    Shadow = NextShadow;
  return cast<BaseUsingDecl>(Shadow->UsingOrNextShadow);
}

void ConstructorUsingShadowDecl::anchor() {}

ConstructorUsingShadowDecl *
ConstructorUsingShadowDecl::Create(ASTContext &C, DeclContext *DC,
                                   SourceLocation Loc, UsingDecl *Using,
                                   NamedDecl *Target, bool IsVirtual) {
  return new (C, DC) ConstructorUsingShadowDecl(C, DC, Loc, Using, Target,
                                                IsVirtual);
}

ConstructorUsingShadowDecl *
ConstructorUsingShadowDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) ConstructorUsingShadowDecl(C, EmptyShell());
}

CXXRecordDecl *ConstructorUsingShadowDecl::getNominatedBaseClass() const {
  return getIntroducer()->getQualifier()->getAsRecordDecl();
}

void BaseUsingDecl::anchor() {}

void BaseUsingDecl::addShadowDecl(UsingShadowDecl *S) {
  assert(!llvm::is_contained(shadows(), S) && "declaration already in set");
  assert(S->getIntroducer() == this);

  if (FirstUsingShadow.getPointer())
    S->UsingOrNextShadow = FirstUsingShadow.getPointer();
  FirstUsingShadow.setPointer(S);
}

void BaseUsingDecl::removeShadowDecl(UsingShadowDecl *S) {
  assert(llvm::is_contained(shadows(), S) && "declaration not in set");
  assert(S->getIntroducer() == this);

  // Remove S from the shadow decl chain. This is O(n) but hopefully rare.

  if (FirstUsingShadow.getPointer() == S) {
    FirstUsingShadow.setPointer(
      dyn_cast<UsingShadowDecl>(S->UsingOrNextShadow));
    S->UsingOrNextShadow = this;
    return;
  }

  UsingShadowDecl *Prev = FirstUsingShadow.getPointer();
  while (Prev->UsingOrNextShadow != S)
    Prev = cast<UsingShadowDecl>(Prev->UsingOrNextShadow);
  Prev->UsingOrNextShadow = S->UsingOrNextShadow;
  S->UsingOrNextShadow = this;
}

void UsingDecl::anchor() {}

UsingDecl *UsingDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation UL,
                             NestedNameSpecifierLoc QualifierLoc,
                             const DeclarationNameInfo &NameInfo,
                             bool HasTypename) {
  return new (C, DC) UsingDecl(DC, UL, QualifierLoc, NameInfo, HasTypename);
}

UsingDecl *UsingDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) UsingDecl(nullptr, SourceLocation(),
                               NestedNameSpecifierLoc(), DeclarationNameInfo(),
                               false);
}

SourceRange UsingDecl::getSourceRange() const {
  SourceLocation Begin = isAccessDeclaration()
    ? getQualifierLoc().getBeginLoc() : UsingLocation;
  return SourceRange(Begin, getNameInfo().getEndLoc());
}

void UsingEnumDecl::anchor() {}

UsingEnumDecl *UsingEnumDecl::Create(ASTContext &C, DeclContext *DC,
                                     SourceLocation UL,
                                     SourceLocation EL,
                                     SourceLocation NL,
                                     TypeSourceInfo *EnumType) {
  assert(isa<EnumDecl>(EnumType->getType()->getAsTagDecl()));
  return new (C, DC)
      UsingEnumDecl(DC, EnumType->getType()->getAsTagDecl()->getDeclName(), UL, EL, NL, EnumType);
}

UsingEnumDecl *UsingEnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID)
      UsingEnumDecl(nullptr, DeclarationName(), SourceLocation(),
                    SourceLocation(), SourceLocation(), nullptr);
}

SourceRange UsingEnumDecl::getSourceRange() const {
  return SourceRange(UsingLocation, EnumType->getTypeLoc().getEndLoc());
}

void UsingPackDecl::anchor() {}

UsingPackDecl *UsingPackDecl::Create(ASTContext &C, DeclContext *DC,
                                     NamedDecl *InstantiatedFrom,
                                     ArrayRef<NamedDecl *> UsingDecls) {
  size_t Extra = additionalSizeToAlloc<NamedDecl *>(UsingDecls.size());
  return new (C, DC, Extra) UsingPackDecl(DC, InstantiatedFrom, UsingDecls);
}

UsingPackDecl *UsingPackDecl::CreateDeserialized(ASTContext &C, unsigned ID,
                                                 unsigned NumExpansions) {
  size_t Extra = additionalSizeToAlloc<NamedDecl *>(NumExpansions);
  auto *Result =
      new (C, ID, Extra) UsingPackDecl(nullptr, nullptr, std::nullopt);
  Result->NumExpansions = NumExpansions;
  auto *Trail = Result->getTrailingObjects<NamedDecl *>();
  for (unsigned I = 0; I != NumExpansions; ++I)
    new (Trail + I) NamedDecl*(nullptr);
  return Result;
}

void UnresolvedUsingValueDecl::anchor() {}

UnresolvedUsingValueDecl *
UnresolvedUsingValueDecl::Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation UsingLoc,
                                 NestedNameSpecifierLoc QualifierLoc,
                                 const DeclarationNameInfo &NameInfo,
                                 SourceLocation EllipsisLoc) {
  return new (C, DC) UnresolvedUsingValueDecl(DC, C.DependentTy, UsingLoc,
                                              QualifierLoc, NameInfo,
                                              EllipsisLoc);
}

UnresolvedUsingValueDecl *
UnresolvedUsingValueDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) UnresolvedUsingValueDecl(nullptr, QualType(),
                                              SourceLocation(),
                                              NestedNameSpecifierLoc(),
                                              DeclarationNameInfo(),
                                              SourceLocation());
}

SourceRange UnresolvedUsingValueDecl::getSourceRange() const {
  SourceLocation Begin = isAccessDeclaration()
    ? getQualifierLoc().getBeginLoc() : UsingLocation;
  return SourceRange(Begin, getNameInfo().getEndLoc());
}

void UnresolvedUsingTypenameDecl::anchor() {}

UnresolvedUsingTypenameDecl *
UnresolvedUsingTypenameDecl::Create(ASTContext &C, DeclContext *DC,
                                    SourceLocation UsingLoc,
                                    SourceLocation TypenameLoc,
                                    NestedNameSpecifierLoc QualifierLoc,
                                    SourceLocation TargetNameLoc,
                                    DeclarationName TargetName,
                                    SourceLocation EllipsisLoc) {
  return new (C, DC) UnresolvedUsingTypenameDecl(
      DC, UsingLoc, TypenameLoc, QualifierLoc, TargetNameLoc,
      TargetName.getAsIdentifierInfo(), EllipsisLoc);
}

UnresolvedUsingTypenameDecl *
UnresolvedUsingTypenameDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) UnresolvedUsingTypenameDecl(
      nullptr, SourceLocation(), SourceLocation(), NestedNameSpecifierLoc(),
      SourceLocation(), nullptr, SourceLocation());
}

UnresolvedUsingIfExistsDecl *
UnresolvedUsingIfExistsDecl::Create(ASTContext &Ctx, DeclContext *DC,
                                    SourceLocation Loc, DeclarationName Name) {
  return new (Ctx, DC) UnresolvedUsingIfExistsDecl(DC, Loc, Name);
}

UnresolvedUsingIfExistsDecl *
UnresolvedUsingIfExistsDecl::CreateDeserialized(ASTContext &Ctx, unsigned ID) {
  return new (Ctx, ID)
      UnresolvedUsingIfExistsDecl(nullptr, SourceLocation(), DeclarationName());
}

UnresolvedUsingIfExistsDecl::UnresolvedUsingIfExistsDecl(DeclContext *DC,
                                                         SourceLocation Loc,
                                                         DeclarationName Name)
    : NamedDecl(Decl::UnresolvedUsingIfExists, DC, Loc, Name) {}

void UnresolvedUsingIfExistsDecl::anchor() {}

void StaticAssertDecl::anchor() {}

StaticAssertDecl *StaticAssertDecl::Create(ASTContext &C, DeclContext *DC,
                                           SourceLocation StaticAssertLoc,
                                           Expr *AssertExpr,
                                           StringLiteral *Message,
                                           SourceLocation RParenLoc,
                                           bool Failed) {
  return new (C, DC) StaticAssertDecl(DC, StaticAssertLoc, AssertExpr, Message,
                                      RParenLoc, Failed);
}

StaticAssertDecl *StaticAssertDecl::CreateDeserialized(ASTContext &C,
                                                       unsigned ID) {
  return new (C, ID) StaticAssertDecl(nullptr, SourceLocation(), nullptr,
                                      nullptr, SourceLocation(), false);
}

VarDecl *ValueDecl::getPotentiallyDecomposedVarDecl() {
  assert((isa<VarDecl, BindingDecl>(this)) &&
         "expected a VarDecl or a BindingDecl");
  if (auto *Var = llvm::dyn_cast<VarDecl>(this))
    return Var;
  if (auto *BD = llvm::dyn_cast<BindingDecl>(this))
    return llvm::dyn_cast<VarDecl>(BD->getDecomposedDecl());
  return nullptr;
}

void BindingDecl::anchor() {}

BindingDecl *BindingDecl::Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation IdLoc, IdentifierInfo *Id) {
  return new (C, DC) BindingDecl(DC, IdLoc, Id);
}

BindingDecl *BindingDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) BindingDecl(nullptr, SourceLocation(), nullptr);
}

VarDecl *BindingDecl::getHoldingVar() const {
  Expr *B = getBinding();
  if (!B)
    return nullptr;
  auto *DRE = dyn_cast<DeclRefExpr>(B->IgnoreImplicit());
  if (!DRE)
    return nullptr;

  auto *VD = cast<VarDecl>(DRE->getDecl());
  assert(VD->isImplicit() && "holding var for binding decl not implicit");
  return VD;
}

void DecompositionDecl::anchor() {}

DecompositionDecl *DecompositionDecl::Create(ASTContext &C, DeclContext *DC,
                                             SourceLocation StartLoc,
                                             SourceLocation LSquareLoc,
                                             QualType T, TypeSourceInfo *TInfo,
                                             StorageClass SC,
                                             ArrayRef<BindingDecl *> Bindings) {
  size_t Extra = additionalSizeToAlloc<BindingDecl *>(Bindings.size());
  return new (C, DC, Extra)
      DecompositionDecl(C, DC, StartLoc, LSquareLoc, T, TInfo, SC, Bindings);
}

DecompositionDecl *DecompositionDecl::CreateDeserialized(ASTContext &C,
                                                         unsigned ID,
                                                         unsigned NumBindings) {
  size_t Extra = additionalSizeToAlloc<BindingDecl *>(NumBindings);
  auto *Result = new (C, ID, Extra)
      DecompositionDecl(C, nullptr, SourceLocation(), SourceLocation(),
                        QualType(), nullptr, StorageClass(), std::nullopt);
  // Set up and clean out the bindings array.
  Result->NumBindings = NumBindings;
  auto *Trail = Result->getTrailingObjects<BindingDecl *>();
  for (unsigned I = 0; I != NumBindings; ++I)
    new (Trail + I) BindingDecl*(nullptr);
  return Result;
}

void DecompositionDecl::printName(llvm::raw_ostream &OS,
                                  const PrintingPolicy &Policy) const {
  OS << '[';
  bool Comma = false;
  for (const auto *B : bindings()) {
    if (Comma)
      OS << ", ";
    B->printName(OS, Policy);
    Comma = true;
  }
  OS << ']';
}

void MSPropertyDecl::anchor() {}

MSPropertyDecl *MSPropertyDecl::Create(ASTContext &C, DeclContext *DC,
                                       SourceLocation L, DeclarationName N,
                                       QualType T, TypeSourceInfo *TInfo,
                                       SourceLocation StartL,
                                       IdentifierInfo *Getter,
                                       IdentifierInfo *Setter) {
  return new (C, DC) MSPropertyDecl(DC, L, N, T, TInfo, StartL, Getter, Setter);
}

MSPropertyDecl *MSPropertyDecl::CreateDeserialized(ASTContext &C,
                                                   unsigned ID) {
  return new (C, ID) MSPropertyDecl(nullptr, SourceLocation(),
                                    DeclarationName(), QualType(), nullptr,
                                    SourceLocation(), nullptr, nullptr);
}

void MSGuidDecl::anchor() {}

MSGuidDecl::MSGuidDecl(DeclContext *DC, QualType T, Parts P)
    : ValueDecl(Decl::MSGuid, DC, SourceLocation(), DeclarationName(), T),
      PartVal(P) {}

MSGuidDecl *MSGuidDecl::Create(const ASTContext &C, QualType T, Parts P) {
  DeclContext *DC = C.getTranslationUnitDecl();
  return new (C, DC) MSGuidDecl(DC, T, P);
}

MSGuidDecl *MSGuidDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID) MSGuidDecl(nullptr, QualType(), Parts());
}

void MSGuidDecl::printName(llvm::raw_ostream &OS,
                           const PrintingPolicy &) const {
  OS << llvm::format("GUID{%08" PRIx32 "-%04" PRIx16 "-%04" PRIx16 "-",
                     PartVal.Part1, PartVal.Part2, PartVal.Part3);
  unsigned I = 0;
  for (uint8_t Byte : PartVal.Part4And5) {
    OS << llvm::format("%02" PRIx8, Byte);
    if (++I == 2)
      OS << '-';
  }
  OS << '}';
}

/// Determine if T is a valid 'struct _GUID' of the shape that we expect.
static bool isValidStructGUID(ASTContext &Ctx, QualType T) {
  // FIXME: We only need to check this once, not once each time we compute a
  // GUID APValue.
  using MatcherRef = llvm::function_ref<bool(QualType)>;

  auto IsInt = [&Ctx](unsigned N) {
    return [&Ctx, N](QualType T) {
      return T->isUnsignedIntegerOrEnumerationType() &&
             Ctx.getIntWidth(T) == N;
    };
  };

  auto IsArray = [&Ctx](MatcherRef Elem, unsigned N) {
    return [&Ctx, Elem, N](QualType T) {
      const ConstantArrayType *CAT = Ctx.getAsConstantArrayType(T);
      return CAT && CAT->getSize() == N && Elem(CAT->getElementType());
    };
  };

  auto IsStruct = [](std::initializer_list<MatcherRef> Fields) {
    return [Fields](QualType T) {
      const RecordDecl *RD = T->getAsRecordDecl();
      if (!RD || RD->isUnion())
        return false;
      RD = RD->getDefinition();
      if (!RD)
        return false;
      if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
        if (CXXRD->getNumBases())
          return false;
      auto MatcherIt = Fields.begin();
      for (const FieldDecl *FD : RD->fields()) {
        if (FD->isUnnamedBitfield()) continue;
        if (FD->isBitField() || MatcherIt == Fields.end() ||
            !(*MatcherIt)(FD->getType()))
          return false;
        ++MatcherIt;
      }
      return MatcherIt == Fields.end();
    };
  };

  // We expect an {i32, i16, i16, [8 x i8]}.
  return IsStruct({IsInt(32), IsInt(16), IsInt(16), IsArray(IsInt(8), 8)})(T);
}

APValue &MSGuidDecl::getAsAPValue() const {
  if (APVal.isAbsent() && isValidStructGUID(getASTContext(), getType())) {
    using llvm::APInt;
    using llvm::APSInt;
    APVal = APValue(APValue::UninitStruct(), 0, 4);
    APVal.getStructField(0) = APValue(APSInt(APInt(32, PartVal.Part1), true));
    APVal.getStructField(1) = APValue(APSInt(APInt(16, PartVal.Part2), true));
    APVal.getStructField(2) = APValue(APSInt(APInt(16, PartVal.Part3), true));
    APValue &Arr = APVal.getStructField(3) =
        APValue(APValue::UninitArray(), 8, 8);
    for (unsigned I = 0; I != 8; ++I) {
      Arr.getArrayInitializedElt(I) =
          APValue(APSInt(APInt(8, PartVal.Part4And5[I]), true));
    }
    // Register this APValue to be destroyed if necessary. (Note that the
    // MSGuidDecl destructor is never run.)
    getASTContext().addDestruction(&APVal);
  }

  return APVal;
}

void UnnamedGlobalConstantDecl::anchor() {}

UnnamedGlobalConstantDecl::UnnamedGlobalConstantDecl(const ASTContext &C,
                                                     DeclContext *DC,
                                                     QualType Ty,
                                                     const APValue &Val)
    : ValueDecl(Decl::UnnamedGlobalConstant, DC, SourceLocation(),
                DeclarationName(), Ty),
      Value(Val) {
  // Cleanup the embedded APValue if required (note that our destructor is never
  // run)
  if (Value.needsCleanup())
    C.addDestruction(&Value);
}

UnnamedGlobalConstantDecl *
UnnamedGlobalConstantDecl::Create(const ASTContext &C, QualType T,
                                  const APValue &Value) {
  DeclContext *DC = C.getTranslationUnitDecl();
  return new (C, DC) UnnamedGlobalConstantDecl(C, DC, T, Value);
}

UnnamedGlobalConstantDecl *
UnnamedGlobalConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
  return new (C, ID)
      UnnamedGlobalConstantDecl(C, nullptr, QualType(), APValue());
}

void UnnamedGlobalConstantDecl::printName(llvm::raw_ostream &OS,
                                          const PrintingPolicy &) const {
  OS << "unnamed-global-constant";
}

static const char *getAccessName(AccessSpecifier AS) {
  switch (AS) {
    case AS_none:
      llvm_unreachable("Invalid access specifier!");
    case AS_public:
      return "public";
    case AS_private:
      return "private";
    case AS_protected:
      return "protected";
  }
  llvm_unreachable("Invalid access specifier!");
}

const StreamingDiagnostic &clang::operator<<(const StreamingDiagnostic &DB,
                                             AccessSpecifier AS) {
  return DB << getAccessName(AS);
}