summaryrefslogtreecommitdiff
path: root/gcc/ada/exp_aggr.adb
blob: 64d8127e5a2f0092e6aa0b97ba066eb266dfbda2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             E X P _ A G G R                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2010, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Atree;    use Atree;
with Checks;   use Checks;
with Debug;    use Debug;
with Einfo;    use Einfo;
with Elists;   use Elists;
with Errout;   use Errout;
with Expander; use Expander;
with Exp_Util; use Exp_Util;
with Exp_Ch3;  use Exp_Ch3;
with Exp_Ch7;  use Exp_Ch7;
with Exp_Ch9;  use Exp_Ch9;
with Exp_Disp; use Exp_Disp;
with Exp_Tss;  use Exp_Tss;
with Fname;    use Fname;
with Freeze;   use Freeze;
with Itypes;   use Itypes;
with Lib;      use Lib;
with Namet;    use Namet;
with Nmake;    use Nmake;
with Nlists;   use Nlists;
with Opt;      use Opt;
with Restrict; use Restrict;
with Rident;   use Rident;
with Rtsfind;  use Rtsfind;
with Ttypes;   use Ttypes;
with Sem;      use Sem;
with Sem_Aux;  use Sem_Aux;
with Sem_Ch3;  use Sem_Ch3;
with Sem_Eval; use Sem_Eval;
with Sem_Res;  use Sem_Res;
with Sem_Util; use Sem_Util;
with Sinfo;    use Sinfo;
with Snames;   use Snames;
with Stand;    use Stand;
with Targparm; use Targparm;
with Tbuild;   use Tbuild;
with Uintp;    use Uintp;

package body Exp_Aggr is

   type Case_Bounds is record
     Choice_Lo   : Node_Id;
     Choice_Hi   : Node_Id;
     Choice_Node : Node_Id;
   end record;

   type Case_Table_Type is array (Nat range <>) of Case_Bounds;
   --  Table type used by Check_Case_Choices procedure

   function Must_Slide
     (Obj_Type : Entity_Id;
      Typ      : Entity_Id) return Boolean;
   --  A static array aggregate in an object declaration can in most cases be
   --  expanded in place. The one exception is when the aggregate is given
   --  with component associations that specify different bounds from those of
   --  the type definition in the object declaration. In this pathological
   --  case the aggregate must slide, and we must introduce an intermediate
   --  temporary to hold it.
   --
   --  The same holds in an assignment to one-dimensional array of arrays,
   --  when a component may be given with bounds that differ from those of the
   --  component type.

   procedure Sort_Case_Table (Case_Table : in out Case_Table_Type);
   --  Sort the Case Table using the Lower Bound of each Choice as the key.
   --  A simple insertion sort is used since the number of choices in a case
   --  statement of variant part will usually be small and probably in near
   --  sorted order.

   function Has_Default_Init_Comps (N : Node_Id) return Boolean;
   --  N is an aggregate (record or array). Checks the presence of default
   --  initialization (<>) in any component (Ada 2005: AI-287).

   function Is_Static_Dispatch_Table_Aggregate (N : Node_Id) return Boolean;
   --  Returns true if N is an aggregate used to initialize the components
   --  of an statically allocated dispatch table.

   ------------------------------------------------------
   -- Local subprograms for Record Aggregate Expansion --
   ------------------------------------------------------

   procedure Expand_Record_Aggregate
     (N           : Node_Id;
      Orig_Tag    : Node_Id := Empty;
      Parent_Expr : Node_Id := Empty);
   --  This is the top level procedure for record aggregate expansion.
   --  Expansion for record aggregates needs expand aggregates for tagged
   --  record types. Specifically Expand_Record_Aggregate adds the Tag
   --  field in front of the Component_Association list that was created
   --  during resolution by Resolve_Record_Aggregate.
   --
   --    N is the record aggregate node.
   --    Orig_Tag is the value of the Tag that has to be provided for this
   --      specific aggregate. It carries the tag corresponding to the type
   --      of the outermost aggregate during the recursive expansion
   --    Parent_Expr is the ancestor part of the original extension
   --      aggregate

   procedure Convert_To_Assignments (N : Node_Id; Typ : Entity_Id);
   --  N is an N_Aggregate or an N_Extension_Aggregate. Typ is the type of the
   --  aggregate (which can only be a record type, this procedure is only used
   --  for record types). Transform the given aggregate into a sequence of
   --  assignments performed component by component.

   function Build_Record_Aggr_Code
     (N                             : Node_Id;
      Typ                           : Entity_Id;
      Lhs                           : Node_Id;
      Flist                         : Node_Id   := Empty;
      Obj                           : Entity_Id := Empty;
      Is_Limited_Ancestor_Expansion : Boolean   := False) return List_Id;
   --  N is an N_Aggregate or an N_Extension_Aggregate. Typ is the type of the
   --  aggregate. Target is an expression containing the location on which the
   --  component by component assignments will take place. Returns the list of
   --  assignments plus all other adjustments needed for tagged and controlled
   --  types. Flist is an expression representing the finalization list on
   --  which to attach the controlled components if any. Obj is present in the
   --  object declaration and dynamic allocation cases, it contains an entity
   --  that allows to know if the value being created needs to be attached to
   --  the final list in case of pragma Finalize_Storage_Only.
   --
   --  ???
   --  The meaning of the Obj formal is extremely unclear. *What* entity
   --  should be passed? For the object declaration case we may guess that
   --  this is the object being declared, but what about the allocator case?
   --
   --  Is_Limited_Ancestor_Expansion indicates that the function has been
   --  called recursively to expand the limited ancestor to avoid copying it.

   function Has_Mutable_Components (Typ : Entity_Id) return Boolean;
   --  Return true if one of the component is of a discriminated type with
   --  defaults. An aggregate for a type with mutable components must be
   --  expanded into individual assignments.

   procedure Initialize_Discriminants (N : Node_Id; Typ : Entity_Id);
   --  If the type of the aggregate is a type extension with renamed discrimi-
   --  nants, we must initialize the hidden discriminants of the parent.
   --  Otherwise, the target object must not be initialized. The discriminants
   --  are initialized by calling the initialization procedure for the type.
   --  This is incorrect if the initialization of other components has any
   --  side effects. We restrict this call to the case where the parent type
   --  has a variant part, because this is the only case where the hidden
   --  discriminants are accessed, namely when calling discriminant checking
   --  functions of the parent type, and when applying a stream attribute to
   --  an object of the derived type.

   -----------------------------------------------------
   -- Local Subprograms for Array Aggregate Expansion --
   -----------------------------------------------------

   function Aggr_Size_OK (N : Node_Id; Typ : Entity_Id) return Boolean;
   --  Very large static aggregates present problems to the back-end, and are
   --  transformed into assignments and loops. This function verifies that the
   --  total number of components of an aggregate is acceptable for rewriting
   --  into a purely positional static form. Aggr_Size_OK must be called before
   --  calling Flatten.
   --
   --  This function also detects and warns about one-component aggregates that
   --  appear in a non-static context. Even if the component value is static,
   --  such an aggregate must be expanded into an assignment.

   procedure Convert_Array_Aggr_In_Allocator
     (Decl   : Node_Id;
      Aggr   : Node_Id;
      Target : Node_Id);
   --  If the aggregate appears within an allocator and can be expanded in
   --  place, this routine generates the individual assignments to components
   --  of the designated object. This is an optimization over the general
   --  case, where a temporary is first created on the stack and then used to
   --  construct the allocated object on the heap.

   procedure Convert_To_Positional
     (N                    : Node_Id;
      Max_Others_Replicate : Nat     := 5;
      Handle_Bit_Packed    : Boolean := False);
   --  If possible, convert named notation to positional notation. This
   --  conversion is possible only in some static cases. If the conversion is
   --  possible, then N is rewritten with the analyzed converted aggregate.
   --  The parameter Max_Others_Replicate controls the maximum number of
   --  values corresponding to an others choice that will be converted to
   --  positional notation (the default of 5 is the normal limit, and reflects
   --  the fact that normally the loop is better than a lot of separate
   --  assignments). Note that this limit gets overridden in any case if
   --  either of the restrictions No_Elaboration_Code or No_Implicit_Loops is
   --  set. The parameter Handle_Bit_Packed is usually set False (since we do
   --  not expect the back end to handle bit packed arrays, so the normal case
   --  of conversion is pointless), but in the special case of a call from
   --  Packed_Array_Aggregate_Handled, we set this parameter to True, since
   --  these are cases we handle in there.

   procedure Expand_Array_Aggregate (N : Node_Id);
   --  This is the top-level routine to perform array aggregate expansion.
   --  N is the N_Aggregate node to be expanded.

   function Backend_Processing_Possible (N : Node_Id) return Boolean;
   --  This function checks if array aggregate N can be processed directly
   --  by the backend. If this is the case True is returned.

   function Build_Array_Aggr_Code
     (N           : Node_Id;
      Ctype       : Entity_Id;
      Index       : Node_Id;
      Into        : Node_Id;
      Scalar_Comp : Boolean;
      Indexes     : List_Id := No_List;
      Flist       : Node_Id := Empty) return List_Id;
   --  This recursive routine returns a list of statements containing the
   --  loops and assignments that are needed for the expansion of the array
   --  aggregate N.
   --
   --    N is the (sub-)aggregate node to be expanded into code. This node
   --    has been fully analyzed, and its Etype is properly set.
   --
   --    Index is the index node corresponding to the array sub-aggregate N.
   --
   --    Into is the target expression into which we are copying the aggregate.
   --    Note that this node may not have been analyzed yet, and so the Etype
   --    field may not be set.
   --
   --    Scalar_Comp is True if the component type of the aggregate is scalar.
   --
   --    Indexes is the current list of expressions used to index the
   --    object we are writing into.
   --
   --    Flist is an expression representing the finalization list on which
   --    to attach the controlled components if any.

   function Number_Of_Choices (N : Node_Id) return Nat;
   --  Returns the number of discrete choices (not including the others choice
   --  if present) contained in (sub-)aggregate N.

   function Late_Expansion
     (N      : Node_Id;
      Typ    : Entity_Id;
      Target : Node_Id;
      Flist  : Node_Id := Empty;
      Obj    : Entity_Id := Empty) return List_Id;
   --  N is a nested (record or array) aggregate that has been marked with
   --  'Delay_Expansion'. Typ is the expected type of the aggregate and Target
   --  is a (duplicable) expression that will hold the result of the aggregate
   --  expansion. Flist is the finalization list to be used to attach
   --  controlled components. 'Obj' when non empty, carries the original
   --  object being initialized in order to know if it needs to be attached to
   --  the previous parameter which may not be the case in the case where
   --  Finalize_Storage_Only is set. Basically this procedure is used to
   --  implement top-down expansions of nested aggregates. This is necessary
   --  for avoiding temporaries at each level as well as for propagating the
   --  right internal finalization list.

   function Make_OK_Assignment_Statement
     (Sloc       : Source_Ptr;
      Name       : Node_Id;
      Expression : Node_Id) return Node_Id;
   --  This is like Make_Assignment_Statement, except that Assignment_OK
   --  is set in the left operand. All assignments built by this unit
   --  use this routine. This is needed to deal with assignments to
   --  initialized constants that are done in place.

   function Packed_Array_Aggregate_Handled (N : Node_Id) return Boolean;
   --  Given an array aggregate, this function handles the case of a packed
   --  array aggregate with all constant values, where the aggregate can be
   --  evaluated at compile time. If this is possible, then N is rewritten
   --  to be its proper compile time value with all the components properly
   --  assembled. The expression is analyzed and resolved and True is
   --  returned. If this transformation is not possible, N is unchanged
   --  and False is returned

   function Safe_Slice_Assignment (N : Node_Id) return Boolean;
   --  If a slice assignment has an aggregate with a single others_choice,
   --  the assignment can be done in place even if bounds are not static,
   --  by converting it into a loop over the discrete range of the slice.

   ------------------
   -- Aggr_Size_OK --
   ------------------

   function Aggr_Size_OK (N : Node_Id; Typ : Entity_Id) return Boolean is
      Lo   : Node_Id;
      Hi   : Node_Id;
      Indx : Node_Id;
      Siz  : Int;
      Lov  : Uint;
      Hiv  : Uint;

      --  The following constant determines the maximum size of an
      --  array aggregate produced by converting named to positional
      --  notation (e.g. from others clauses). This avoids running
      --  away with attempts to convert huge aggregates, which hit
      --  memory limits in the backend.

      --  The normal limit is 5000, but we increase this limit to
      --  2**24 (about 16 million) if Restrictions (No_Elaboration_Code)
      --  or Restrictions (No_Implicit_Loops) is specified, since in
      --  either case, we are at risk of declaring the program illegal
      --  because of this limit.

      Max_Aggr_Size : constant Nat :=
                        5000 + (2 ** 24 - 5000) *
                          Boolean'Pos
                            (Restriction_Active (No_Elaboration_Code)
                               or else
                             Restriction_Active (No_Implicit_Loops));

      function Component_Count (T : Entity_Id) return Int;
      --  The limit is applied to the total number of components that the
      --  aggregate will have, which is the number of static expressions
      --  that will appear in the flattened array. This requires a recursive
      --  computation of the number of scalar components of the structure.

      ---------------------
      -- Component_Count --
      ---------------------

      function Component_Count (T : Entity_Id) return Int is
         Res  : Int := 0;
         Comp : Entity_Id;

      begin
         if Is_Scalar_Type (T) then
            return 1;

         elsif Is_Record_Type (T) then
            Comp := First_Component (T);
            while Present (Comp) loop
               Res := Res + Component_Count (Etype (Comp));
               Next_Component (Comp);
            end loop;

            return Res;

         elsif Is_Array_Type (T) then
            declare
               Lo : constant Node_Id :=
                      Type_Low_Bound (Etype (First_Index (T)));
               Hi : constant Node_Id :=
                      Type_High_Bound (Etype (First_Index (T)));

               Siz  : constant Int := Component_Count (Component_Type (T));

            begin
               if not Compile_Time_Known_Value (Lo)
                 or else not Compile_Time_Known_Value (Hi)
               then
                  return 0;
               else
                  return
                    Siz * UI_To_Int (Expr_Value (Hi) - Expr_Value (Lo) + 1);
               end if;
            end;

         else
            --  Can only be a null for an access type

            return 1;
         end if;
      end Component_Count;

   --  Start of processing for Aggr_Size_OK

   begin
      Siz  := Component_Count (Component_Type (Typ));

      Indx := First_Index (Typ);
      while Present (Indx) loop
         Lo  := Type_Low_Bound (Etype (Indx));
         Hi  := Type_High_Bound (Etype (Indx));

         --  Bounds need to be known at compile time

         if not Compile_Time_Known_Value (Lo)
           or else not Compile_Time_Known_Value (Hi)
         then
            return False;
         end if;

         Lov := Expr_Value (Lo);
         Hiv := Expr_Value (Hi);

         --  A flat array is always safe

         if Hiv < Lov then
            return True;
         end if;

         --  One-component aggregates are suspicious, and if the context type
         --  is an object declaration with non-static bounds it will trip gcc;
         --  such an aggregate must be expanded into a single assignment.

         if Hiv = Lov
           and then Nkind (Parent (N)) = N_Object_Declaration
         then
            declare
               Index_Type : constant Entity_Id :=
                              Etype
                                (First_Index
                                   (Etype (Defining_Identifier (Parent (N)))));
               Indx       : Node_Id;

            begin
               if not Compile_Time_Known_Value (Type_Low_Bound (Index_Type))
                  or else not Compile_Time_Known_Value
                                (Type_High_Bound (Index_Type))
               then
                  if Present (Component_Associations (N)) then
                     Indx :=
                       First (Choices (First (Component_Associations (N))));
                     if Is_Entity_Name (Indx)
                       and then not Is_Type (Entity (Indx))
                     then
                        Error_Msg_N
                          ("single component aggregate in non-static context?",
                            Indx);
                        Error_Msg_N ("\maybe subtype name was meant?", Indx);
                     end if;
                  end if;

                  return False;
               end if;
            end;
         end if;

         declare
            Rng : constant Uint := Hiv - Lov + 1;

         begin
            --  Check if size is too large

            if not UI_Is_In_Int_Range (Rng) then
               return False;
            end if;

            Siz := Siz * UI_To_Int (Rng);
         end;

         if Siz <= 0
           or else Siz > Max_Aggr_Size
         then
            return False;
         end if;

         --  Bounds must be in integer range, for later array construction

         if not UI_Is_In_Int_Range (Lov)
             or else
            not UI_Is_In_Int_Range (Hiv)
         then
            return False;
         end if;

         Next_Index (Indx);
      end loop;

      return True;
   end Aggr_Size_OK;

   ---------------------------------
   -- Backend_Processing_Possible --
   ---------------------------------

   --  Backend processing by Gigi/gcc is possible only if all the following
   --  conditions are met:

   --    1. N is fully positional

   --    2. N is not a bit-packed array aggregate;

   --    3. The size of N's array type must be known at compile time. Note
   --       that this implies that the component size is also known

   --    4. The array type of N does not follow the Fortran layout convention
   --       or if it does it must be 1 dimensional.

   --    5. The array component type may not be tagged (which could necessitate
   --       reassignment of proper tags).

   --    6. The array component type must not have unaligned bit components

   --    7. None of the components of the aggregate may be bit unaligned
   --       components.

   --    8. There cannot be delayed components, since we do not know enough
   --       at this stage to know if back end processing is possible.

   --    9. There cannot be any discriminated record components, since the
   --       back end cannot handle this complex case.

   --   10. No controlled actions need to be generated for components

   --   11. For a VM back end, the array should have no aliased components

   function Backend_Processing_Possible (N : Node_Id) return Boolean is
      Typ : constant Entity_Id := Etype (N);
      --  Typ is the correct constrained array subtype of the aggregate

      function Component_Check (N : Node_Id; Index : Node_Id) return Boolean;
      --  This routine checks components of aggregate N, enforcing checks
      --  1, 7, 8, and 9. In the multi-dimensional case, these checks are
      --  performed on subaggregates. The Index value is the current index
      --  being checked in the multi-dimensional case.

      ---------------------
      -- Component_Check --
      ---------------------

      function Component_Check (N : Node_Id; Index : Node_Id) return Boolean is
         Expr : Node_Id;

      begin
         --  Checks 1: (no component associations)

         if Present (Component_Associations (N)) then
            return False;
         end if;

         --  Checks on components

         --  Recurse to check subaggregates, which may appear in qualified
         --  expressions. If delayed, the front-end will have to expand.
         --  If the component is a discriminated record, treat as non-static,
         --  as the back-end cannot handle this properly.

         Expr := First (Expressions (N));
         while Present (Expr) loop

            --  Checks 8: (no delayed components)

            if Is_Delayed_Aggregate (Expr) then
               return False;
            end if;

            --  Checks 9: (no discriminated records)

            if Present (Etype (Expr))
              and then Is_Record_Type (Etype (Expr))
              and then Has_Discriminants (Etype (Expr))
            then
               return False;
            end if;

            --  Checks 7. Component must not be bit aligned component

            if Possible_Bit_Aligned_Component (Expr) then
               return False;
            end if;

            --  Recursion to following indexes for multiple dimension case

            if Present (Next_Index (Index))
               and then not Component_Check (Expr, Next_Index (Index))
            then
               return False;
            end if;

            --  All checks for that component finished, on to next

            Next (Expr);
         end loop;

         return True;
      end Component_Check;

   --  Start of processing for Backend_Processing_Possible

   begin
      --  Checks 2 (array not bit packed) and 10 (no controlled actions)

      if Is_Bit_Packed_Array (Typ) or else Needs_Finalization (Typ) then
         return False;
      end if;

      --  If component is limited, aggregate must be expanded because each
      --  component assignment must be built in place.

      if Is_Immutably_Limited_Type (Component_Type (Typ)) then
         return False;
      end if;

      --  Checks 4 (array must not be multi-dimensional Fortran case)

      if Convention (Typ) = Convention_Fortran
        and then Number_Dimensions (Typ) > 1
      then
         return False;
      end if;

      --  Checks 3 (size of array must be known at compile time)

      if not Size_Known_At_Compile_Time (Typ) then
         return False;
      end if;

      --  Checks on components

      if not Component_Check (N, First_Index (Typ)) then
         return False;
      end if;

      --  Checks 5 (if the component type is tagged, then we may need to do
      --    tag adjustments. Perhaps this should be refined to check for any
      --    component associations that actually need tag adjustment, similar
      --    to the test in Component_Not_OK_For_Backend for record aggregates
      --    with tagged components, but not clear whether it's worthwhile ???;
      --    in the case of the JVM, object tags are handled implicitly)

      if Is_Tagged_Type (Component_Type (Typ))
        and then Tagged_Type_Expansion
      then
         return False;
      end if;

      --  Checks 6 (component type must not have bit aligned components)

      if Type_May_Have_Bit_Aligned_Components (Component_Type (Typ)) then
         return False;
      end if;

      --  Checks 11: Array aggregates with aliased components are currently
      --  not well supported by the VM backend; disable temporarily this
      --  backend processing until it is definitely supported.

      if VM_Target /= No_VM
        and then Has_Aliased_Components (Base_Type (Typ))
      then
         return False;
      end if;

      --  Backend processing is possible

      Set_Size_Known_At_Compile_Time (Etype (N), True);
      return True;
   end Backend_Processing_Possible;

   ---------------------------
   -- Build_Array_Aggr_Code --
   ---------------------------

   --  The code that we generate from a one dimensional aggregate is

   --  1. If the sub-aggregate contains discrete choices we

   --     (a) Sort the discrete choices

   --     (b) Otherwise for each discrete choice that specifies a range we
   --         emit a loop. If a range specifies a maximum of three values, or
   --         we are dealing with an expression we emit a sequence of
   --         assignments instead of a loop.

   --     (c) Generate the remaining loops to cover the others choice if any

   --  2. If the aggregate contains positional elements we

   --     (a) translate the positional elements in a series of assignments

   --     (b) Generate a final loop to cover the others choice if any.
   --         Note that this final loop has to be a while loop since the case

   --             L : Integer := Integer'Last;
   --             H : Integer := Integer'Last;
   --             A : array (L .. H) := (1, others =>0);

   --         cannot be handled by a for loop. Thus for the following

   --             array (L .. H) := (.. positional elements.., others =>E);

   --         we always generate something like:

   --             J : Index_Type := Index_Of_Last_Positional_Element;
   --             while J < H loop
   --                J := Index_Base'Succ (J)
   --                Tmp (J) := E;
   --             end loop;

   function Build_Array_Aggr_Code
     (N           : Node_Id;
      Ctype       : Entity_Id;
      Index       : Node_Id;
      Into        : Node_Id;
      Scalar_Comp : Boolean;
      Indexes     : List_Id := No_List;
      Flist       : Node_Id := Empty) return List_Id
   is
      Loc          : constant Source_Ptr := Sloc (N);
      Index_Base   : constant Entity_Id  := Base_Type (Etype (Index));
      Index_Base_L : constant Node_Id := Type_Low_Bound (Index_Base);
      Index_Base_H : constant Node_Id := Type_High_Bound (Index_Base);

      function Add (Val : Int; To : Node_Id) return Node_Id;
      --  Returns an expression where Val is added to expression To, unless
      --  To+Val is provably out of To's base type range. To must be an
      --  already analyzed expression.

      function Empty_Range (L, H : Node_Id) return Boolean;
      --  Returns True if the range defined by L .. H is certainly empty

      function Equal (L, H : Node_Id) return Boolean;
      --  Returns True if L = H for sure

      function Index_Base_Name return Node_Id;
      --  Returns a new reference to the index type name

      function Gen_Assign (Ind : Node_Id; Expr : Node_Id) return List_Id;
      --  Ind must be a side-effect free expression. If the input aggregate
      --  N to Build_Loop contains no sub-aggregates, then this function
      --  returns the assignment statement:
      --
      --     Into (Indexes, Ind) := Expr;
      --
      --  Otherwise we call Build_Code recursively
      --
      --  Ada 2005 (AI-287): In case of default initialized component, Expr
      --  is empty and we generate a call to the corresponding IP subprogram.

      function Gen_Loop (L, H : Node_Id; Expr : Node_Id) return List_Id;
      --  Nodes L and H must be side-effect free expressions.
      --  If the input aggregate N to Build_Loop contains no sub-aggregates,
      --  This routine returns the for loop statement
      --
      --     for J in Index_Base'(L) .. Index_Base'(H) loop
      --        Into (Indexes, J) := Expr;
      --     end loop;
      --
      --  Otherwise we call Build_Code recursively.
      --  As an optimization if the loop covers 3 or less scalar elements we
      --  generate a sequence of assignments.

      function Gen_While (L, H : Node_Id; Expr : Node_Id) return List_Id;
      --  Nodes L and H must be side-effect free expressions.
      --  If the input aggregate N to Build_Loop contains no sub-aggregates,
      --  This routine returns the while loop statement
      --
      --     J : Index_Base := L;
      --     while J < H loop
      --        J := Index_Base'Succ (J);
      --        Into (Indexes, J) := Expr;
      --     end loop;
      --
      --  Otherwise we call Build_Code recursively

      function Local_Compile_Time_Known_Value (E : Node_Id) return Boolean;
      function Local_Expr_Value               (E : Node_Id) return Uint;
      --  These two Local routines are used to replace the corresponding ones
      --  in sem_eval because while processing the bounds of an aggregate with
      --  discrete choices whose index type is an enumeration, we build static
      --  expressions not recognized by Compile_Time_Known_Value as such since
      --  they have not yet been analyzed and resolved. All the expressions in
      --  question are things like Index_Base_Name'Val (Const) which we can
      --  easily recognize as being constant.

      ---------
      -- Add --
      ---------

      function Add (Val : Int; To : Node_Id) return Node_Id is
         Expr_Pos : Node_Id;
         Expr     : Node_Id;
         To_Pos   : Node_Id;
         U_To     : Uint;
         U_Val    : constant Uint := UI_From_Int (Val);

      begin
         --  Note: do not try to optimize the case of Val = 0, because
         --  we need to build a new node with the proper Sloc value anyway.

         --  First test if we can do constant folding

         if Local_Compile_Time_Known_Value (To) then
            U_To := Local_Expr_Value (To) + Val;

            --  Determine if our constant is outside the range of the index.
            --  If so return an Empty node. This empty node will be caught
            --  by Empty_Range below.

            if Compile_Time_Known_Value (Index_Base_L)
              and then U_To < Expr_Value (Index_Base_L)
            then
               return Empty;

            elsif Compile_Time_Known_Value (Index_Base_H)
              and then U_To > Expr_Value (Index_Base_H)
            then
               return Empty;
            end if;

            Expr_Pos := Make_Integer_Literal (Loc, U_To);
            Set_Is_Static_Expression (Expr_Pos);

            if not Is_Enumeration_Type (Index_Base) then
               Expr := Expr_Pos;

            --  If we are dealing with enumeration return
            --     Index_Base'Val (Expr_Pos)

            else
               Expr :=
                 Make_Attribute_Reference
                   (Loc,
                    Prefix         => Index_Base_Name,
                    Attribute_Name => Name_Val,
                    Expressions    => New_List (Expr_Pos));
            end if;

            return Expr;
         end if;

         --  If we are here no constant folding possible

         if not Is_Enumeration_Type (Index_Base) then
            Expr :=
              Make_Op_Add (Loc,
                           Left_Opnd  => Duplicate_Subexpr (To),
                           Right_Opnd => Make_Integer_Literal (Loc, U_Val));

         --  If we are dealing with enumeration return
         --    Index_Base'Val (Index_Base'Pos (To) + Val)

         else
            To_Pos :=
              Make_Attribute_Reference
                (Loc,
                 Prefix         => Index_Base_Name,
                 Attribute_Name => Name_Pos,
                 Expressions    => New_List (Duplicate_Subexpr (To)));

            Expr_Pos :=
              Make_Op_Add (Loc,
                           Left_Opnd  => To_Pos,
                           Right_Opnd => Make_Integer_Literal (Loc, U_Val));

            Expr :=
              Make_Attribute_Reference
                (Loc,
                 Prefix         => Index_Base_Name,
                 Attribute_Name => Name_Val,
                 Expressions    => New_List (Expr_Pos));
         end if;

         return Expr;
      end Add;

      -----------------
      -- Empty_Range --
      -----------------

      function Empty_Range (L, H : Node_Id) return Boolean is
         Is_Empty : Boolean := False;
         Low      : Node_Id;
         High     : Node_Id;

      begin
         --  First check if L or H were already detected as overflowing the
         --  index base range type by function Add above. If this is so Add
         --  returns the empty node.

         if No (L) or else No (H) then
            return True;
         end if;

         for J in 1 .. 3 loop
            case J is

               --  L > H    range is empty

               when 1 =>
                  Low  := L;
                  High := H;

               --  B_L > H  range must be empty

               when 2 =>
                  Low  := Index_Base_L;
                  High := H;

               --  L > B_H  range must be empty

               when 3 =>
                  Low  := L;
                  High := Index_Base_H;
            end case;

            if Local_Compile_Time_Known_Value (Low)
              and then Local_Compile_Time_Known_Value (High)
            then
               Is_Empty :=
                 UI_Gt (Local_Expr_Value (Low), Local_Expr_Value (High));
            end if;

            exit when Is_Empty;
         end loop;

         return Is_Empty;
      end Empty_Range;

      -----------
      -- Equal --
      -----------

      function Equal (L, H : Node_Id) return Boolean is
      begin
         if L = H then
            return True;

         elsif Local_Compile_Time_Known_Value (L)
           and then Local_Compile_Time_Known_Value (H)
         then
            return UI_Eq (Local_Expr_Value (L), Local_Expr_Value (H));
         end if;

         return False;
      end Equal;

      ----------------
      -- Gen_Assign --
      ----------------

      function Gen_Assign (Ind : Node_Id; Expr : Node_Id) return List_Id is
         L : constant List_Id := New_List;
         F : Entity_Id;
         A : Node_Id;

         New_Indexes  : List_Id;
         Indexed_Comp : Node_Id;
         Expr_Q       : Node_Id;
         Comp_Type    : Entity_Id := Empty;

         function Add_Loop_Actions (Lis : List_Id) return List_Id;
         --  Collect insert_actions generated in the construction of a
         --  loop, and prepend them to the sequence of assignments to
         --  complete the eventual body of the loop.

         ----------------------
         -- Add_Loop_Actions --
         ----------------------

         function Add_Loop_Actions (Lis : List_Id) return List_Id is
            Res : List_Id;

         begin
            --  Ada 2005 (AI-287): Do nothing else in case of default
            --  initialized component.

            if No (Expr) then
               return Lis;

            elsif Nkind (Parent (Expr)) = N_Component_Association
              and then Present (Loop_Actions (Parent (Expr)))
            then
               Append_List (Lis, Loop_Actions (Parent (Expr)));
               Res := Loop_Actions (Parent (Expr));
               Set_Loop_Actions (Parent (Expr), No_List);
               return Res;

            else
               return Lis;
            end if;
         end Add_Loop_Actions;

      --  Start of processing for Gen_Assign

      begin
         if No (Indexes) then
            New_Indexes := New_List;
         else
            New_Indexes := New_Copy_List_Tree (Indexes);
         end if;

         Append_To (New_Indexes, Ind);

         if Present (Flist) then
            F := New_Copy_Tree (Flist);

         elsif Present (Etype (N)) and then Needs_Finalization (Etype (N)) then
            if Is_Entity_Name (Into)
              and then Present (Scope (Entity (Into)))
            then
               F := Find_Final_List (Scope (Entity (Into)));
            else
               F := Find_Final_List (Current_Scope);
            end if;
         else
            F := Empty;
         end if;

         if Present (Next_Index (Index)) then
            return
              Add_Loop_Actions (
                Build_Array_Aggr_Code
                  (N           => Expr,
                   Ctype       => Ctype,
                   Index       => Next_Index (Index),
                   Into        => Into,
                   Scalar_Comp => Scalar_Comp,
                   Indexes     => New_Indexes,
                   Flist       => F));
         end if;

         --  If we get here then we are at a bottom-level (sub-)aggregate

         Indexed_Comp :=
           Checks_Off
             (Make_Indexed_Component (Loc,
                Prefix      => New_Copy_Tree (Into),
                Expressions => New_Indexes));

         Set_Assignment_OK (Indexed_Comp);

         --  Ada 2005 (AI-287): In case of default initialized component, Expr
         --  is not present (and therefore we also initialize Expr_Q to empty).

         if No (Expr) then
            Expr_Q := Empty;
         elsif Nkind (Expr) = N_Qualified_Expression then
            Expr_Q := Expression (Expr);
         else
            Expr_Q := Expr;
         end if;

         if Present (Etype (N))
           and then Etype (N) /= Any_Composite
         then
            Comp_Type := Component_Type (Etype (N));
            pragma Assert (Comp_Type = Ctype); --  AI-287

         elsif Present (Next (First (New_Indexes))) then

            --  Ada 2005 (AI-287): Do nothing in case of default initialized
            --  component because we have received the component type in
            --  the formal parameter Ctype.

            --  ??? Some assert pragmas have been added to check if this new
            --      formal can be used to replace this code in all cases.

            if Present (Expr) then

               --  This is a multidimensional array. Recover the component
               --  type from the outermost aggregate, because subaggregates
               --  do not have an assigned type.

               declare
                  P : Node_Id;

               begin
                  P := Parent (Expr);
                  while Present (P) loop
                     if Nkind (P) = N_Aggregate
                       and then Present (Etype (P))
                     then
                        Comp_Type := Component_Type (Etype (P));
                        exit;

                     else
                        P := Parent (P);
                     end if;
                  end loop;

                  pragma Assert (Comp_Type = Ctype); --  AI-287
               end;
            end if;
         end if;

         --  Ada 2005 (AI-287): We only analyze the expression in case of non-
         --  default initialized components (otherwise Expr_Q is not present).

         if Present (Expr_Q)
           and then Nkind_In (Expr_Q, N_Aggregate, N_Extension_Aggregate)
         then
            --  At this stage the Expression may not have been analyzed yet
            --  because the array aggregate code has not been updated to use
            --  the Expansion_Delayed flag and avoid analysis altogether to
            --  solve the same problem (see Resolve_Aggr_Expr). So let us do
            --  the analysis of non-array aggregates now in order to get the
            --  value of Expansion_Delayed flag for the inner aggregate ???

            if Present (Comp_Type) and then not Is_Array_Type (Comp_Type) then
               Analyze_And_Resolve (Expr_Q, Comp_Type);
            end if;

            if Is_Delayed_Aggregate (Expr_Q) then

               --  This is either a subaggregate of a multidimensional array,
               --  or a component of an array type whose component type is
               --  also an array. In the latter case, the expression may have
               --  component associations that provide different bounds from
               --  those of the component type, and sliding must occur. Instead
               --  of decomposing the current aggregate assignment, force the
               --  re-analysis of the assignment, so that a temporary will be
               --  generated in the usual fashion, and sliding will take place.

               if Nkind (Parent (N)) = N_Assignment_Statement
                 and then Is_Array_Type (Comp_Type)
                 and then Present (Component_Associations (Expr_Q))
                 and then Must_Slide (Comp_Type, Etype (Expr_Q))
               then
                  Set_Expansion_Delayed (Expr_Q, False);
                  Set_Analyzed (Expr_Q, False);

               else
                  return
                    Add_Loop_Actions (
                      Late_Expansion (
                        Expr_Q, Etype (Expr_Q), Indexed_Comp, F));
               end if;
            end if;
         end if;

         --  Ada 2005 (AI-287): In case of default initialized component, call
         --  the initialization subprogram associated with the component type.
         --  If the component type is an access type, add an explicit null
         --  assignment, because for the back-end there is an initialization
         --  present for the whole aggregate, and no default initialization
         --  will take place.

         --  In addition, if the component type is controlled, we must call
         --  its Initialize procedure explicitly, because there is no explicit
         --  object creation that will invoke it otherwise.

         if No (Expr) then
            if Present (Base_Init_Proc (Base_Type (Ctype)))
              or else Has_Task (Base_Type (Ctype))
            then
               Append_List_To (L,
                 Build_Initialization_Call (Loc,
                   Id_Ref            => Indexed_Comp,
                   Typ               => Ctype,
                   With_Default_Init => True));

            elsif Is_Access_Type (Ctype) then
               Append_To (L,
                  Make_Assignment_Statement (Loc,
                     Name => Indexed_Comp,
                     Expression => Make_Null (Loc)));
            end if;

            if Needs_Finalization (Ctype) then
               Append_List_To (L,
                 Make_Init_Call (
                   Ref         => New_Copy_Tree (Indexed_Comp),
                   Typ         => Ctype,
                   Flist_Ref   => Find_Final_List (Current_Scope),
                   With_Attach => Make_Integer_Literal (Loc, 1)));
            end if;

         else
            --  Now generate the assignment with no associated controlled
            --  actions since the target of the assignment may not have been
            --  initialized, it is not possible to Finalize it as expected by
            --  normal controlled assignment. The rest of the controlled
            --  actions are done manually with the proper finalization list
            --  coming from the context.

            A :=
              Make_OK_Assignment_Statement (Loc,
                Name       => Indexed_Comp,
                Expression => New_Copy_Tree (Expr));

            if Present (Comp_Type) and then Needs_Finalization (Comp_Type) then
               Set_No_Ctrl_Actions (A);

               --  If this is an aggregate for an array of arrays, each
               --  sub-aggregate will be expanded as well, and even with
               --  No_Ctrl_Actions the assignments of inner components will
               --  require attachment in their assignments to temporaries.
               --  These temporaries must be finalized for each subaggregate,
               --  to prevent multiple attachments of the same temporary
               --  location to same finalization chain (and consequently
               --  circular lists). To ensure that finalization takes place
               --  for each subaggregate we wrap the assignment in a block.

               if Is_Array_Type (Comp_Type)
                 and then Nkind (Expr) = N_Aggregate
               then
                  A :=
                    Make_Block_Statement (Loc,
                      Handled_Statement_Sequence =>
                        Make_Handled_Sequence_Of_Statements (Loc,
                           Statements => New_List (A)));
               end if;
            end if;

            Append_To (L, A);

            --  Adjust the tag if tagged (because of possible view
            --  conversions), unless compiling for a VM where
            --  tags are implicit.

            if Present (Comp_Type)
              and then Is_Tagged_Type (Comp_Type)
              and then Tagged_Type_Expansion
            then
               A :=
                 Make_OK_Assignment_Statement (Loc,
                   Name =>
                     Make_Selected_Component (Loc,
                       Prefix =>  New_Copy_Tree (Indexed_Comp),
                       Selector_Name =>
                         New_Reference_To
                           (First_Tag_Component (Comp_Type), Loc)),

                   Expression =>
                     Unchecked_Convert_To (RTE (RE_Tag),
                       New_Reference_To
                         (Node (First_Elmt (Access_Disp_Table (Comp_Type))),
                          Loc)));

               Append_To (L, A);
            end if;

            --  Adjust and attach the component to the proper final list, which
            --  can be the controller of the outer record object or the final
            --  list associated with the scope.

            --  If the component is itself an array of controlled types, whose
            --  value is given by a sub-aggregate, then the attach calls have
            --  been generated when individual subcomponent are assigned, and
            --  must not be done again to prevent malformed finalization chains
            --  (see comments above, concerning the creation of a block to hold
            --  inner finalization actions).

            if Present (Comp_Type)
              and then Needs_Finalization (Comp_Type)
              and then not Is_Limited_Type (Comp_Type)
              and then not
                (Is_Array_Type (Comp_Type)
                   and then Is_Controlled (Component_Type (Comp_Type))
                   and then Nkind (Expr) = N_Aggregate)
            then
               Append_List_To (L,
                 Make_Adjust_Call (
                   Ref         => New_Copy_Tree (Indexed_Comp),
                   Typ         => Comp_Type,
                   Flist_Ref   => F,
                   With_Attach => Make_Integer_Literal (Loc, 1)));
            end if;
         end if;

         return Add_Loop_Actions (L);
      end Gen_Assign;

      --------------
      -- Gen_Loop --
      --------------

      function Gen_Loop (L, H : Node_Id; Expr : Node_Id) return List_Id is
         L_J : Node_Id;

         L_L : Node_Id;
         --  Index_Base'(L)

         L_H : Node_Id;
         --  Index_Base'(H)

         L_Range : Node_Id;
         --  Index_Base'(L) .. Index_Base'(H)

         L_Iteration_Scheme : Node_Id;
         --  L_J in Index_Base'(L) .. Index_Base'(H)

         L_Body : List_Id;
         --  The statements to execute in the loop

         S : constant List_Id := New_List;
         --  List of statements

         Tcopy : Node_Id;
         --  Copy of expression tree, used for checking purposes

      begin
         --  If loop bounds define an empty range return the null statement

         if Empty_Range (L, H) then
            Append_To (S, Make_Null_Statement (Loc));

            --  Ada 2005 (AI-287): Nothing else need to be done in case of
            --  default initialized component.

            if No (Expr) then
               null;

            else
               --  The expression must be type-checked even though no component
               --  of the aggregate will have this value. This is done only for
               --  actual components of the array, not for subaggregates. Do
               --  the check on a copy, because the expression may be shared
               --  among several choices, some of which might be non-null.

               if Present (Etype (N))
                 and then Is_Array_Type (Etype (N))
                 and then No (Next_Index (Index))
               then
                  Expander_Mode_Save_And_Set (False);
                  Tcopy := New_Copy_Tree (Expr);
                  Set_Parent (Tcopy, N);
                  Analyze_And_Resolve (Tcopy, Component_Type (Etype (N)));
                  Expander_Mode_Restore;
               end if;
            end if;

            return S;

         --  If loop bounds are the same then generate an assignment

         elsif Equal (L, H) then
            return Gen_Assign (New_Copy_Tree (L), Expr);

         --  If H - L <= 2 then generate a sequence of assignments when we are
         --  processing the bottom most aggregate and it contains scalar
         --  components.

         elsif No (Next_Index (Index))
           and then Scalar_Comp
           and then Local_Compile_Time_Known_Value (L)
           and then Local_Compile_Time_Known_Value (H)
           and then Local_Expr_Value (H) - Local_Expr_Value (L) <= 2
         then

            Append_List_To (S, Gen_Assign (New_Copy_Tree (L), Expr));
            Append_List_To (S, Gen_Assign (Add (1, To => L), Expr));

            if Local_Expr_Value (H) - Local_Expr_Value (L) = 2 then
               Append_List_To (S, Gen_Assign (Add (2, To => L), Expr));
            end if;

            return S;
         end if;

         --  Otherwise construct the loop, starting with the loop index L_J

         L_J := Make_Temporary (Loc, 'J', L);

         --  Construct "L .. H" in Index_Base. We use a qualified expression
         --  for the bound to convert to the index base, but we don't need
         --  to do that if we already have the base type at hand.

         if Etype (L) = Index_Base then
            L_L := L;
         else
            L_L :=
              Make_Qualified_Expression (Loc,
                Subtype_Mark => Index_Base_Name,
                Expression   => L);
         end if;

         if Etype (H) = Index_Base then
            L_H := H;
         else
            L_H :=
              Make_Qualified_Expression (Loc,
                Subtype_Mark => Index_Base_Name,
                Expression   => H);
         end if;

         L_Range :=
           Make_Range (Loc,
             Low_Bound => L_L,
             High_Bound => L_H);

         --  Construct "for L_J in Index_Base range L .. H"

         L_Iteration_Scheme :=
           Make_Iteration_Scheme
             (Loc,
              Loop_Parameter_Specification =>
                Make_Loop_Parameter_Specification
                  (Loc,
                   Defining_Identifier         => L_J,
                   Discrete_Subtype_Definition => L_Range));

         --  Construct the statements to execute in the loop body

         L_Body := Gen_Assign (New_Reference_To (L_J, Loc), Expr);

         --  Construct the final loop

         Append_To (S, Make_Implicit_Loop_Statement
                         (Node             => N,
                          Identifier       => Empty,
                          Iteration_Scheme => L_Iteration_Scheme,
                          Statements       => L_Body));

         --  A small optimization: if the aggregate is initialized with a box
         --  and the component type has no initialization procedure, remove the
         --  useless empty loop.

         if Nkind (First (S)) = N_Loop_Statement
           and then Is_Empty_List (Statements (First (S)))
         then
            return New_List (Make_Null_Statement (Loc));
         else
            return S;
         end if;
      end Gen_Loop;

      ---------------
      -- Gen_While --
      ---------------

      --  The code built is

      --     W_J : Index_Base := L;
      --     while W_J < H loop
      --        W_J := Index_Base'Succ (W);
      --        L_Body;
      --     end loop;

      function Gen_While (L, H : Node_Id; Expr : Node_Id) return List_Id is
         W_J : Node_Id;

         W_Decl : Node_Id;
         --  W_J : Base_Type := L;

         W_Iteration_Scheme : Node_Id;
         --  while W_J < H

         W_Index_Succ : Node_Id;
         --  Index_Base'Succ (J)

         W_Increment : Node_Id;
         --  W_J := Index_Base'Succ (W)

         W_Body : constant List_Id := New_List;
         --  The statements to execute in the loop

         S : constant List_Id := New_List;
         --  list of statement

      begin
         --  If loop bounds define an empty range or are equal return null

         if Empty_Range (L, H) or else Equal (L, H) then
            Append_To (S, Make_Null_Statement (Loc));
            return S;
         end if;

         --  Build the decl of W_J

         W_J    := Make_Temporary (Loc, 'J', L);
         W_Decl :=
           Make_Object_Declaration
             (Loc,
              Defining_Identifier => W_J,
              Object_Definition   => Index_Base_Name,
              Expression          => L);

         --  Theoretically we should do a New_Copy_Tree (L) here, but we know
         --  that in this particular case L is a fresh Expr generated by
         --  Add which we are the only ones to use.

         Append_To (S, W_Decl);

         --  Construct " while W_J < H"

         W_Iteration_Scheme :=
           Make_Iteration_Scheme
             (Loc,
              Condition => Make_Op_Lt
                             (Loc,
                              Left_Opnd  => New_Reference_To (W_J, Loc),
                              Right_Opnd => New_Copy_Tree (H)));

         --  Construct the statements to execute in the loop body

         W_Index_Succ :=
           Make_Attribute_Reference
             (Loc,
              Prefix         => Index_Base_Name,
              Attribute_Name => Name_Succ,
              Expressions    => New_List (New_Reference_To (W_J, Loc)));

         W_Increment  :=
           Make_OK_Assignment_Statement
             (Loc,
              Name       => New_Reference_To (W_J, Loc),
              Expression => W_Index_Succ);

         Append_To (W_Body, W_Increment);
         Append_List_To (W_Body,
           Gen_Assign (New_Reference_To (W_J, Loc), Expr));

         --  Construct the final loop

         Append_To (S, Make_Implicit_Loop_Statement
                         (Node             => N,
                          Identifier       => Empty,
                          Iteration_Scheme => W_Iteration_Scheme,
                          Statements       => W_Body));

         return S;
      end Gen_While;

      ---------------------
      -- Index_Base_Name --
      ---------------------

      function Index_Base_Name return Node_Id is
      begin
         return New_Reference_To (Index_Base, Sloc (N));
      end Index_Base_Name;

      ------------------------------------
      -- Local_Compile_Time_Known_Value --
      ------------------------------------

      function Local_Compile_Time_Known_Value (E : Node_Id) return Boolean is
      begin
         return Compile_Time_Known_Value (E)
           or else
             (Nkind (E) = N_Attribute_Reference
               and then Attribute_Name (E) = Name_Val
               and then Compile_Time_Known_Value (First (Expressions (E))));
      end Local_Compile_Time_Known_Value;

      ----------------------
      -- Local_Expr_Value --
      ----------------------

      function Local_Expr_Value (E : Node_Id) return Uint is
      begin
         if Compile_Time_Known_Value (E) then
            return Expr_Value (E);
         else
            return Expr_Value (First (Expressions (E)));
         end if;
      end Local_Expr_Value;

      --  Build_Array_Aggr_Code Variables

      Assoc  : Node_Id;
      Choice : Node_Id;
      Expr   : Node_Id;
      Typ    : Entity_Id;

      Others_Expr        : Node_Id := Empty;
      Others_Box_Present : Boolean := False;

      Aggr_L : constant Node_Id := Low_Bound (Aggregate_Bounds (N));
      Aggr_H : constant Node_Id := High_Bound (Aggregate_Bounds (N));
      --  The aggregate bounds of this specific sub-aggregate. Note that if
      --  the code generated by Build_Array_Aggr_Code is executed then these
      --  bounds are OK. Otherwise a Constraint_Error would have been raised.

      Aggr_Low  : constant Node_Id := Duplicate_Subexpr_No_Checks (Aggr_L);
      Aggr_High : constant Node_Id := Duplicate_Subexpr_No_Checks (Aggr_H);
      --  After Duplicate_Subexpr these are side-effect free

      Low        : Node_Id;
      High       : Node_Id;

      Nb_Choices : Nat := 0;
      Table      : Case_Table_Type (1 .. Number_Of_Choices (N));
      --  Used to sort all the different choice values

      Nb_Elements : Int;
      --  Number of elements in the positional aggregate

      New_Code : constant List_Id := New_List;

   --  Start of processing for Build_Array_Aggr_Code

   begin
      --  First before we start, a special case. if we have a bit packed
      --  array represented as a modular type, then clear the value to
      --  zero first, to ensure that unused bits are properly cleared.

      Typ := Etype (N);

      if Present (Typ)
        and then Is_Bit_Packed_Array (Typ)
        and then Is_Modular_Integer_Type (Packed_Array_Type (Typ))
      then
         Append_To (New_Code,
           Make_Assignment_Statement (Loc,
             Name => New_Copy_Tree (Into),
             Expression =>
               Unchecked_Convert_To (Typ,
                 Make_Integer_Literal (Loc, Uint_0))));
      end if;

      --  If the component type contains tasks, we need to build a Master
      --  entity in the current scope, because it will be needed if build-
      --  in-place functions are called in the expanded code.

      if Nkind (Parent (N)) = N_Object_Declaration
        and then Has_Task (Typ)
      then
         Build_Master_Entity (Defining_Identifier (Parent (N)));
      end if;

      --  STEP 1: Process component associations

      --  For those associations that may generate a loop, initialize
      --  Loop_Actions to collect inserted actions that may be crated.

      --  Skip this if no component associations

      if No (Expressions (N)) then

         --  STEP 1 (a): Sort the discrete choices

         Assoc := First (Component_Associations (N));
         while Present (Assoc) loop
            Choice := First (Choices (Assoc));
            while Present (Choice) loop
               if Nkind (Choice) = N_Others_Choice then
                  Set_Loop_Actions (Assoc, New_List);

                  if Box_Present (Assoc) then
                     Others_Box_Present := True;
                  else
                     Others_Expr := Expression (Assoc);
                  end if;
                  exit;
               end if;

               Get_Index_Bounds (Choice, Low, High);

               if Low /= High then
                  Set_Loop_Actions (Assoc, New_List);
               end if;

               Nb_Choices := Nb_Choices + 1;
               if Box_Present (Assoc) then
                  Table (Nb_Choices) := (Choice_Lo   => Low,
                                         Choice_Hi   => High,
                                         Choice_Node => Empty);
               else
                  Table (Nb_Choices) := (Choice_Lo   => Low,
                                         Choice_Hi   => High,
                                         Choice_Node => Expression (Assoc));
               end if;
               Next (Choice);
            end loop;

            Next (Assoc);
         end loop;

         --  If there is more than one set of choices these must be static
         --  and we can therefore sort them. Remember that Nb_Choices does not
         --  account for an others choice.

         if Nb_Choices > 1 then
            Sort_Case_Table (Table);
         end if;

         --  STEP 1 (b):  take care of the whole set of discrete choices

         for J in 1 .. Nb_Choices loop
            Low  := Table (J).Choice_Lo;
            High := Table (J).Choice_Hi;
            Expr := Table (J).Choice_Node;
            Append_List (Gen_Loop (Low, High, Expr), To => New_Code);
         end loop;

         --  STEP 1 (c): generate the remaining loops to cover others choice
         --  We don't need to generate loops over empty gaps, but if there is
         --  a single empty range we must analyze the expression for semantics

         if Present (Others_Expr) or else Others_Box_Present then
            declare
               First : Boolean := True;

            begin
               for J in 0 .. Nb_Choices loop
                  if J = 0 then
                     Low := Aggr_Low;
                  else
                     Low := Add (1, To => Table (J).Choice_Hi);
                  end if;

                  if J = Nb_Choices then
                     High := Aggr_High;
                  else
                     High := Add (-1, To => Table (J + 1).Choice_Lo);
                  end if;

                  --  If this is an expansion within an init proc, make
                  --  sure that discriminant references are replaced by
                  --  the corresponding discriminal.

                  if Inside_Init_Proc then
                     if Is_Entity_Name (Low)
                       and then Ekind (Entity (Low)) = E_Discriminant
                     then
                        Set_Entity (Low, Discriminal (Entity (Low)));
                     end if;

                     if Is_Entity_Name (High)
                       and then Ekind (Entity (High)) = E_Discriminant
                     then
                        Set_Entity (High, Discriminal (Entity (High)));
                     end if;
                  end if;

                  if First
                    or else not Empty_Range (Low, High)
                  then
                     First := False;
                     Append_List
                       (Gen_Loop (Low, High, Others_Expr), To => New_Code);
                  end if;
               end loop;
            end;
         end if;

      --  STEP 2: Process positional components

      else
         --  STEP 2 (a): Generate the assignments for each positional element
         --  Note that here we have to use Aggr_L rather than Aggr_Low because
         --  Aggr_L is analyzed and Add wants an analyzed expression.

         Expr        := First (Expressions (N));
         Nb_Elements := -1;
         while Present (Expr) loop
            Nb_Elements := Nb_Elements + 1;
            Append_List (Gen_Assign (Add (Nb_Elements, To => Aggr_L), Expr),
                         To => New_Code);
            Next (Expr);
         end loop;

         --  STEP 2 (b): Generate final loop if an others choice is present
         --  Here Nb_Elements gives the offset of the last positional element.

         if Present (Component_Associations (N)) then
            Assoc := Last (Component_Associations (N));

            --  Ada 2005 (AI-287)

            if Box_Present (Assoc) then
               Append_List (Gen_While (Add (Nb_Elements, To => Aggr_L),
                                       Aggr_High,
                                       Empty),
                            To => New_Code);
            else
               Expr  := Expression (Assoc);

               Append_List (Gen_While (Add (Nb_Elements, To => Aggr_L),
                                       Aggr_High,
                                       Expr), --  AI-287
                            To => New_Code);
            end if;
         end if;
      end if;

      return New_Code;
   end Build_Array_Aggr_Code;

   ----------------------------
   -- Build_Record_Aggr_Code --
   ----------------------------

   function Build_Record_Aggr_Code
     (N                             : Node_Id;
      Typ                           : Entity_Id;
      Lhs                           : Node_Id;
      Flist                         : Node_Id   := Empty;
      Obj                           : Entity_Id := Empty;
      Is_Limited_Ancestor_Expansion : Boolean   := False) return List_Id
   is
      Loc     : constant Source_Ptr := Sloc (N);
      L       : constant List_Id    := New_List;
      N_Typ   : constant Entity_Id  := Etype (N);

      Comp      : Node_Id;
      Instr     : Node_Id;
      Ref       : Node_Id;
      Target    : Entity_Id;
      F         : Node_Id;
      Comp_Type : Entity_Id;
      Selector  : Entity_Id;
      Comp_Expr : Node_Id;
      Expr_Q    : Node_Id;

      Internal_Final_List : Node_Id := Empty;

      --  If this is an internal aggregate, the External_Final_List is an
      --  expression for the controller record of the enclosing type.

      --  If the current aggregate has several controlled components, this
      --  expression will appear in several calls to attach to the finali-
      --  zation list, and it must not be shared.

      External_Final_List      : Node_Id;
      Ancestor_Is_Expression   : Boolean := False;
      Ancestor_Is_Subtype_Mark : Boolean := False;

      Init_Typ : Entity_Id := Empty;
      Attach   : Node_Id;

      Ctrl_Stuff_Done : Boolean := False;
      --  True if Gen_Ctrl_Actions_For_Aggr has already been called; calls
      --  after the first do nothing.

      function Ancestor_Discriminant_Value (Disc : Entity_Id) return Node_Id;
      --  Returns the value that the given discriminant of an ancestor type
      --  should receive (in the absence of a conflict with the value provided
      --  by an ancestor part of an extension aggregate).

      procedure Check_Ancestor_Discriminants (Anc_Typ : Entity_Id);
      --  Check that each of the discriminant values defined by the ancestor
      --  part of an extension aggregate match the corresponding values
      --  provided by either an association of the aggregate or by the
      --  constraint imposed by a parent type (RM95-4.3.2(8)).

      function Compatible_Int_Bounds
        (Agg_Bounds : Node_Id;
         Typ_Bounds : Node_Id) return Boolean;
      --  Return true if Agg_Bounds are equal or within Typ_Bounds. It is
      --  assumed that both bounds are integer ranges.

      procedure Gen_Ctrl_Actions_For_Aggr;
      --  Deal with the various controlled type data structure initializations
      --  (but only if it hasn't been done already).

      function Get_Constraint_Association (T : Entity_Id) return Node_Id;
      --  Returns the first discriminant association in the constraint
      --  associated with T, if any, otherwise returns Empty.

      function Init_Controller
        (Target  : Node_Id;
         Typ     : Entity_Id;
         F       : Node_Id;
         Attach  : Node_Id;
         Init_Pr : Boolean) return List_Id;
      --  Returns the list of statements necessary to initialize the internal
      --  controller of the (possible) ancestor typ into target and attach it
      --  to finalization list F. Init_Pr conditions the call to the init proc
      --  since it may already be done due to ancestor initialization.

      function Is_Int_Range_Bounds (Bounds : Node_Id) return Boolean;
      --  Check whether Bounds is a range node and its lower and higher bounds
      --  are integers literals.

      ---------------------------------
      -- Ancestor_Discriminant_Value --
      ---------------------------------

      function Ancestor_Discriminant_Value (Disc : Entity_Id) return Node_Id is
         Assoc        : Node_Id;
         Assoc_Elmt   : Elmt_Id;
         Aggr_Comp    : Entity_Id;
         Corresp_Disc : Entity_Id;
         Current_Typ  : Entity_Id := Base_Type (Typ);
         Parent_Typ   : Entity_Id;
         Parent_Disc  : Entity_Id;
         Save_Assoc   : Node_Id := Empty;

      begin
         --  First check any discriminant associations to see if any of them
         --  provide a value for the discriminant.

         if Present (Discriminant_Specifications (Parent (Current_Typ))) then
            Assoc := First (Component_Associations (N));
            while Present (Assoc) loop
               Aggr_Comp := Entity (First (Choices (Assoc)));

               if Ekind (Aggr_Comp) = E_Discriminant then
                  Save_Assoc := Expression (Assoc);

                  Corresp_Disc := Corresponding_Discriminant (Aggr_Comp);
                  while Present (Corresp_Disc) loop

                     --  If found a corresponding discriminant then return the
                     --  value given in the aggregate. (Note: this is not
                     --  correct in the presence of side effects. ???)

                     if Disc = Corresp_Disc then
                        return Duplicate_Subexpr (Expression (Assoc));
                     end if;

                     Corresp_Disc :=
                       Corresponding_Discriminant (Corresp_Disc);
                  end loop;
               end if;

               Next (Assoc);
            end loop;
         end if;

         --  No match found in aggregate, so chain up parent types to find
         --  a constraint that defines the value of the discriminant.

         Parent_Typ := Etype (Current_Typ);
         while Current_Typ /= Parent_Typ loop
            if Has_Discriminants (Parent_Typ)
              and then not Has_Unknown_Discriminants (Parent_Typ)
            then
               Parent_Disc := First_Discriminant (Parent_Typ);

               --  We either get the association from the subtype indication
               --  of the type definition itself, or from the discriminant
               --  constraint associated with the type entity (which is
               --  preferable, but it's not always present ???)

               if Is_Empty_Elmt_List (
                 Discriminant_Constraint (Current_Typ))
               then
                  Assoc := Get_Constraint_Association (Current_Typ);
                  Assoc_Elmt := No_Elmt;
               else
                  Assoc_Elmt :=
                    First_Elmt (Discriminant_Constraint (Current_Typ));
                  Assoc := Node (Assoc_Elmt);
               end if;

               --  Traverse the discriminants of the parent type looking
               --  for one that corresponds.

               while Present (Parent_Disc) and then Present (Assoc) loop
                  Corresp_Disc := Parent_Disc;
                  while Present (Corresp_Disc)
                    and then Disc /= Corresp_Disc
                  loop
                     Corresp_Disc :=
                       Corresponding_Discriminant (Corresp_Disc);
                  end loop;

                  if Disc = Corresp_Disc then
                     if Nkind (Assoc) = N_Discriminant_Association then
                        Assoc := Expression (Assoc);
                     end if;

                     --  If the located association directly denotes a
                     --  discriminant, then use the value of a saved
                     --  association of the aggregate. This is a kludge to
                     --  handle certain cases involving multiple discriminants
                     --  mapped to a single discriminant of a descendant. It's
                     --  not clear how to locate the appropriate discriminant
                     --  value for such cases. ???

                     if Is_Entity_Name (Assoc)
                       and then Ekind (Entity (Assoc)) = E_Discriminant
                     then
                        Assoc := Save_Assoc;
                     end if;

                     return Duplicate_Subexpr (Assoc);
                  end if;

                  Next_Discriminant (Parent_Disc);

                  if No (Assoc_Elmt) then
                     Next (Assoc);
                  else
                     Next_Elmt (Assoc_Elmt);
                     if Present (Assoc_Elmt) then
                        Assoc := Node (Assoc_Elmt);
                     else
                        Assoc := Empty;
                     end if;
                  end if;
               end loop;
            end if;

            Current_Typ := Parent_Typ;
            Parent_Typ := Etype (Current_Typ);
         end loop;

         --  In some cases there's no ancestor value to locate (such as
         --  when an ancestor part given by an expression defines the
         --  discriminant value).

         return Empty;
      end Ancestor_Discriminant_Value;

      ----------------------------------
      -- Check_Ancestor_Discriminants --
      ----------------------------------

      procedure Check_Ancestor_Discriminants (Anc_Typ : Entity_Id) is
         Discr      : Entity_Id;
         Disc_Value : Node_Id;
         Cond       : Node_Id;

      begin
         Discr := First_Discriminant (Base_Type (Anc_Typ));
         while Present (Discr) loop
            Disc_Value := Ancestor_Discriminant_Value (Discr);

            if Present (Disc_Value) then
               Cond := Make_Op_Ne (Loc,
                 Left_Opnd =>
                   Make_Selected_Component (Loc,
                     Prefix        => New_Copy_Tree (Target),
                     Selector_Name => New_Occurrence_Of (Discr, Loc)),
                 Right_Opnd => Disc_Value);

               Append_To (L,
                 Make_Raise_Constraint_Error (Loc,
                   Condition => Cond,
                   Reason    => CE_Discriminant_Check_Failed));
            end if;

            Next_Discriminant (Discr);
         end loop;
      end Check_Ancestor_Discriminants;

      ---------------------------
      -- Compatible_Int_Bounds --
      ---------------------------

      function Compatible_Int_Bounds
        (Agg_Bounds : Node_Id;
         Typ_Bounds : Node_Id) return Boolean
      is
         Agg_Lo : constant Uint := Intval (Low_Bound  (Agg_Bounds));
         Agg_Hi : constant Uint := Intval (High_Bound (Agg_Bounds));
         Typ_Lo : constant Uint := Intval (Low_Bound  (Typ_Bounds));
         Typ_Hi : constant Uint := Intval (High_Bound (Typ_Bounds));
      begin
         return Typ_Lo <= Agg_Lo and then Agg_Hi <= Typ_Hi;
      end Compatible_Int_Bounds;

      --------------------------------
      -- Get_Constraint_Association --
      --------------------------------

      function Get_Constraint_Association (T : Entity_Id) return Node_Id is
         Typ_Def : constant Node_Id := Type_Definition (Parent (T));
         Indic   : constant Node_Id := Subtype_Indication (Typ_Def);

      begin
         --  ??? Also need to cover case of a type mark denoting a subtype
         --  with constraint.

         if Nkind (Indic) = N_Subtype_Indication
           and then Present (Constraint (Indic))
         then
            return First (Constraints (Constraint (Indic)));
         end if;

         return Empty;
      end Get_Constraint_Association;

      ---------------------
      -- Init_Controller --
      ---------------------

      function Init_Controller
        (Target  : Node_Id;
         Typ     : Entity_Id;
         F       : Node_Id;
         Attach  : Node_Id;
         Init_Pr : Boolean) return List_Id
      is
         L           : constant List_Id := New_List;
         Ref         : Node_Id;
         RC          : RE_Id;
         Target_Type : Entity_Id;

      begin
         --  Generate:
         --     init-proc (target._controller);
         --     initialize (target._controller);
         --     Attach_to_Final_List (target._controller, F);

         Ref :=
           Make_Selected_Component (Loc,
             Prefix        => Convert_To (Typ, New_Copy_Tree (Target)),
             Selector_Name => Make_Identifier (Loc, Name_uController));
         Set_Assignment_OK (Ref);

         --  Ada 2005 (AI-287): Give support to aggregates of limited types.
         --  If the type is intrinsically limited the controller is limited as
         --  well. If it is tagged and limited then so is the controller.
         --  Otherwise an untagged type may have limited components without its
         --  full view being limited, so the controller is not limited.

         if Nkind (Target) = N_Identifier then
            Target_Type := Etype (Target);

         elsif Nkind (Target) = N_Selected_Component then
            Target_Type := Etype (Selector_Name (Target));

         elsif Nkind (Target) = N_Unchecked_Type_Conversion then
            Target_Type := Etype (Target);

         elsif Nkind (Target) = N_Unchecked_Expression
           and then Nkind (Expression (Target)) = N_Indexed_Component
         then
            Target_Type := Etype (Prefix (Expression (Target)));

         else
            Target_Type := Etype (Target);
         end if;

         --  If the target has not been analyzed yet, as will happen with
         --  delayed expansion, use the given type (either the aggregate type
         --  or an ancestor) to determine limitedness.

         if No (Target_Type) then
            Target_Type := Typ;
         end if;

         if (Is_Tagged_Type (Target_Type))
           and then Is_Limited_Type (Target_Type)
         then
            RC := RE_Limited_Record_Controller;

         elsif Is_Immutably_Limited_Type (Target_Type) then
            RC := RE_Limited_Record_Controller;

         else
            RC := RE_Record_Controller;
         end if;

         if Init_Pr then
            Append_List_To (L,
              Build_Initialization_Call (Loc,
                Id_Ref       => Ref,
                Typ          => RTE (RC),
                In_Init_Proc => Within_Init_Proc));
         end if;

         Append_To (L,
           Make_Procedure_Call_Statement (Loc,
             Name =>
               New_Reference_To (
                 Find_Prim_Op (RTE (RC), Name_Initialize), Loc),
             Parameter_Associations =>
               New_List (New_Copy_Tree (Ref))));

         Append_To (L,
           Make_Attach_Call (
             Obj_Ref     => New_Copy_Tree (Ref),
             Flist_Ref   => F,
             With_Attach => Attach));

         return L;
      end Init_Controller;

      -------------------------
      -- Is_Int_Range_Bounds --
      -------------------------

      function Is_Int_Range_Bounds (Bounds : Node_Id) return Boolean is
      begin
         return Nkind (Bounds) = N_Range
           and then Nkind (Low_Bound  (Bounds)) = N_Integer_Literal
           and then Nkind (High_Bound (Bounds)) = N_Integer_Literal;
      end Is_Int_Range_Bounds;

      -------------------------------
      -- Gen_Ctrl_Actions_For_Aggr --
      -------------------------------

      procedure Gen_Ctrl_Actions_For_Aggr is
         Alloc : Node_Id := Empty;

      begin
         --  Do the work only the first time this is called

         if Ctrl_Stuff_Done then
            return;
         end if;

         Ctrl_Stuff_Done := True;

         if Present (Obj)
           and then Finalize_Storage_Only (Typ)
           and then
             (Is_Library_Level_Entity (Obj)
                or else Entity (Constant_Value (RTE (RE_Garbage_Collected))) =
                                                          Standard_True)

            --  why not Is_True (Expr_Value (RTE (RE_Garbaage_Collected) ???
         then
            Attach := Make_Integer_Literal (Loc, 0);

         elsif Nkind (Parent (N)) = N_Qualified_Expression
           and then Nkind (Parent (Parent (N))) = N_Allocator
         then
            Alloc  := Parent (Parent (N));
            Attach := Make_Integer_Literal (Loc, 2);

         else
            Attach := Make_Integer_Literal (Loc, 1);
         end if;

         --  Determine the external finalization list. It is either the
         --  finalization list of the outer-scope or the one coming from
         --  an outer aggregate.  When the target is not a temporary, the
         --  proper scope is the scope of the target rather than the
         --  potentially transient current scope.

         if Needs_Finalization (Typ) then

            --  The current aggregate belongs to an allocator which creates
            --  an object through an anonymous access type or acts as the root
            --  of a coextension chain.

            if Present (Alloc)
              and then
                (Is_Coextension_Root (Alloc)
                   or else Ekind (Etype (Alloc)) = E_Anonymous_Access_Type)
            then
               if No (Associated_Final_Chain (Etype (Alloc))) then
                  Build_Final_List (Alloc, Etype (Alloc));
               end if;

               External_Final_List :=
                 Make_Selected_Component (Loc,
                   Prefix =>
                     New_Reference_To (
                       Associated_Final_Chain (Etype (Alloc)), Loc),
                   Selector_Name => Make_Identifier (Loc, Name_F));

            elsif Present (Flist) then
               External_Final_List := New_Copy_Tree (Flist);

            elsif Is_Entity_Name (Target)
              and then Present (Scope (Entity (Target)))
            then
               External_Final_List :=
                 Find_Final_List (Scope (Entity (Target)));

            else
               External_Final_List := Find_Final_List (Current_Scope);
            end if;
         else
            External_Final_List := Empty;
         end if;

         --  Initialize and attach the outer object in the is_controlled case

         if Is_Controlled (Typ) then
            if Ancestor_Is_Subtype_Mark then
               Ref := Convert_To (Init_Typ, New_Copy_Tree (Target));
               Set_Assignment_OK (Ref);
               Append_To (L,
                 Make_Procedure_Call_Statement (Loc,
                   Name =>
                     New_Reference_To
                       (Find_Prim_Op (Init_Typ, Name_Initialize), Loc),
                   Parameter_Associations => New_List (New_Copy_Tree (Ref))));
            end if;

            if not Has_Controlled_Component (Typ) then
               Ref := New_Copy_Tree (Target);
               Set_Assignment_OK (Ref);

               --  This is an aggregate of a coextension. Do not produce a
               --  finalization call, but rather attach the reference of the
               --  aggregate to its coextension chain.

               if Present (Alloc)
                 and then Is_Dynamic_Coextension (Alloc)
               then
                  if No (Coextensions (Alloc)) then
                     Set_Coextensions (Alloc, New_Elmt_List);
                  end if;

                  Append_Elmt (Ref, Coextensions (Alloc));
               else
                  Append_To (L,
                    Make_Attach_Call (
                      Obj_Ref     => Ref,
                      Flist_Ref   => New_Copy_Tree (External_Final_List),
                      With_Attach => Attach));
               end if;
            end if;
         end if;

         --  In the Has_Controlled component case, all the intermediate
         --  controllers must be initialized.

         if Has_Controlled_Component (Typ)
           and not Is_Limited_Ancestor_Expansion
         then
            declare
               Inner_Typ : Entity_Id;
               Outer_Typ : Entity_Id;
               At_Root   : Boolean;

            begin
               --  Find outer type with a controller

               Outer_Typ := Base_Type (Typ);
               while Outer_Typ /= Init_Typ
                 and then not Has_New_Controlled_Component (Outer_Typ)
               loop
                  Outer_Typ := Etype (Outer_Typ);
               end loop;

               --  Attach it to the outer record controller to the external
               --  final list.

               if Outer_Typ = Init_Typ then
                  Append_List_To (L,
                    Init_Controller (
                      Target  => Target,
                      Typ     => Outer_Typ,
                      F       => External_Final_List,
                      Attach  => Attach,
                      Init_Pr => False));

                  At_Root   := True;
                  Inner_Typ := Init_Typ;

               else
                  Append_List_To (L,
                    Init_Controller (
                      Target  => Target,
                      Typ     => Outer_Typ,
                      F       => External_Final_List,
                      Attach  => Attach,
                      Init_Pr => True));

                  Inner_Typ := Etype (Outer_Typ);
                  At_Root   :=
                    not Is_Tagged_Type (Typ) or else Inner_Typ = Outer_Typ;
               end if;

               --  The outer object has to be attached as well

               if Is_Controlled (Typ) then
                  Ref := New_Copy_Tree (Target);
                  Set_Assignment_OK (Ref);
                  Append_To (L,
                    Make_Attach_Call (
                      Obj_Ref     => Ref,
                      Flist_Ref   => New_Copy_Tree (External_Final_List),
                      With_Attach => New_Copy_Tree (Attach)));
               end if;

               --  Initialize the internal controllers for tagged types with
               --  more than one controller.

               while not At_Root and then Inner_Typ /= Init_Typ loop
                  if Has_New_Controlled_Component (Inner_Typ) then
                     F :=
                       Make_Selected_Component (Loc,
                         Prefix =>
                           Convert_To (Outer_Typ, New_Copy_Tree (Target)),
                         Selector_Name =>
                           Make_Identifier (Loc, Name_uController));
                     F :=
                       Make_Selected_Component (Loc,
                         Prefix => F,
                         Selector_Name => Make_Identifier (Loc, Name_F));

                     Append_List_To (L,
                       Init_Controller (
                         Target  => Target,
                         Typ     => Inner_Typ,
                         F       => F,
                         Attach  => Make_Integer_Literal (Loc, 1),
                         Init_Pr => True));
                     Outer_Typ := Inner_Typ;
                  end if;

                  --  Stop at the root

                  At_Root := Inner_Typ = Etype (Inner_Typ);
                  Inner_Typ := Etype (Inner_Typ);
               end loop;

               --  If not done yet attach the controller of the ancestor part

               if Outer_Typ /= Init_Typ
                 and then Inner_Typ = Init_Typ
                 and then Has_Controlled_Component (Init_Typ)
               then
                  F :=
                    Make_Selected_Component (Loc,
                      Prefix => Convert_To (Outer_Typ, New_Copy_Tree (Target)),
                      Selector_Name =>
                        Make_Identifier (Loc, Name_uController));
                  F :=
                    Make_Selected_Component (Loc,
                      Prefix        => F,
                      Selector_Name => Make_Identifier (Loc, Name_F));

                  Attach := Make_Integer_Literal (Loc, 1);
                  Append_List_To (L,
                    Init_Controller (
                      Target  => Target,
                      Typ     => Init_Typ,
                      F       => F,
                      Attach  => Attach,
                      Init_Pr => False));

                     --  Note: Init_Pr is False because the ancestor part has
                     --  already been initialized either way (by default, if
                     --  given by a type name, otherwise from the expression).

               end if;
            end;
         end if;
      end Gen_Ctrl_Actions_For_Aggr;

      function Rewrite_Discriminant (Expr : Node_Id) return Traverse_Result;
      --  If default expression of a component mentions a discriminant of the
      --  type, it must be rewritten as the discriminant of the target object.

      function Replace_Type (Expr : Node_Id) return Traverse_Result;
      --  If the aggregate contains a self-reference, traverse each expression
      --  to replace a possible self-reference with a reference to the proper
      --  component of the target of the assignment.

      --------------------------
      -- Rewrite_Discriminant --
      --------------------------

      function Rewrite_Discriminant (Expr : Node_Id) return Traverse_Result is
      begin
         if Is_Entity_Name (Expr)
           and then Present (Entity (Expr))
           and then Ekind (Entity (Expr)) = E_In_Parameter
           and then Present (Discriminal_Link (Entity (Expr)))
           and then Scope (Discriminal_Link (Entity (Expr)))
                      = Base_Type (Etype (N))
         then
            Rewrite (Expr,
              Make_Selected_Component (Loc,
                Prefix        => New_Copy_Tree (Lhs),
                Selector_Name => Make_Identifier (Loc, Chars (Expr))));
         end if;
         return OK;
      end Rewrite_Discriminant;

      ------------------
      -- Replace_Type --
      ------------------

      function Replace_Type (Expr : Node_Id) return Traverse_Result is
      begin
         --  Note regarding the Root_Type test below: Aggregate components for
         --  self-referential types include attribute references to the current
         --  instance, of the form: Typ'access, etc.. These references are
         --  rewritten as references to the target of the aggregate: the
         --  left-hand side of an assignment, the entity in a declaration,
         --  or a temporary. Without this test, we would improperly extended
         --  this rewriting to attribute references whose prefix was not the
         --  type of the aggregate.

         if Nkind (Expr) = N_Attribute_Reference
           and then Is_Entity_Name (Prefix (Expr))
           and then Is_Type (Entity (Prefix (Expr)))
           and then Root_Type (Etype (N)) = Root_Type (Entity (Prefix (Expr)))
         then
            if Is_Entity_Name (Lhs) then
               Rewrite (Prefix (Expr),
                 New_Occurrence_Of (Entity (Lhs), Loc));

            elsif Nkind (Lhs) = N_Selected_Component then
               Rewrite (Expr,
                 Make_Attribute_Reference (Loc,
                   Attribute_Name => Name_Unrestricted_Access,
                   Prefix         => New_Copy_Tree (Prefix (Lhs))));
               Set_Analyzed (Parent (Expr), False);

            else
               Rewrite (Expr,
                 Make_Attribute_Reference (Loc,
                   Attribute_Name => Name_Unrestricted_Access,
                   Prefix         => New_Copy_Tree (Lhs)));
               Set_Analyzed (Parent (Expr), False);
            end if;
         end if;

         return OK;
      end Replace_Type;

      procedure Replace_Self_Reference is
        new Traverse_Proc (Replace_Type);

      procedure Replace_Discriminants is
        new Traverse_Proc (Rewrite_Discriminant);

   --  Start of processing for Build_Record_Aggr_Code

   begin
      if Has_Self_Reference (N) then
         Replace_Self_Reference (N);
      end if;

      --  If the target of the aggregate is class-wide, we must convert it
      --  to the actual type of the aggregate, so that the proper components
      --  are visible. We know already that the types are compatible.

      if Present (Etype (Lhs))
        and then Is_Class_Wide_Type (Etype (Lhs))
      then
         Target := Unchecked_Convert_To (Typ, Lhs);
      else
         Target := Lhs;
      end if;

      --  Deal with the ancestor part of extension aggregates or with the
      --  discriminants of the root type.

      if Nkind (N) = N_Extension_Aggregate then
         declare
            A      : constant Node_Id := Ancestor_Part (N);
            Assign : List_Id;

         begin
            --  If the ancestor part is a subtype mark "T", we generate

            --     init-proc (T(tmp));  if T is constrained and
            --     init-proc (S(tmp));  where S applies an appropriate
            --                          constraint if T is unconstrained

            if Is_Entity_Name (A) and then Is_Type (Entity (A)) then
               Ancestor_Is_Subtype_Mark := True;

               if Is_Constrained (Entity (A)) then
                  Init_Typ := Entity (A);

               --  For an ancestor part given by an unconstrained type mark,
               --  create a subtype constrained by appropriate corresponding
               --  discriminant values coming from either associations of the
               --  aggregate or a constraint on a parent type. The subtype will
               --  be used to generate the correct default value for the
               --  ancestor part.

               elsif Has_Discriminants (Entity (A)) then
                  declare
                     Anc_Typ    : constant Entity_Id := Entity (A);
                     Anc_Constr : constant List_Id   := New_List;
                     Discrim    : Entity_Id;
                     Disc_Value : Node_Id;
                     New_Indic  : Node_Id;
                     Subt_Decl  : Node_Id;

                  begin
                     Discrim := First_Discriminant (Anc_Typ);
                     while Present (Discrim) loop
                        Disc_Value := Ancestor_Discriminant_Value (Discrim);
                        Append_To (Anc_Constr, Disc_Value);
                        Next_Discriminant (Discrim);
                     end loop;

                     New_Indic :=
                       Make_Subtype_Indication (Loc,
                         Subtype_Mark => New_Occurrence_Of (Anc_Typ, Loc),
                         Constraint   =>
                           Make_Index_Or_Discriminant_Constraint (Loc,
                             Constraints => Anc_Constr));

                     Init_Typ := Create_Itype (Ekind (Anc_Typ), N);

                     Subt_Decl :=
                       Make_Subtype_Declaration (Loc,
                         Defining_Identifier => Init_Typ,
                         Subtype_Indication  => New_Indic);

                     --  Itypes must be analyzed with checks off Declaration
                     --  must have a parent for proper handling of subsidiary
                     --  actions.

                     Set_Parent (Subt_Decl, N);
                     Analyze (Subt_Decl, Suppress => All_Checks);
                  end;
               end if;

               Ref := Convert_To (Init_Typ, New_Copy_Tree (Target));
               Set_Assignment_OK (Ref);

               if not Is_Interface (Init_Typ) then
                  Append_List_To (L,
                    Build_Initialization_Call (Loc,
                      Id_Ref            => Ref,
                      Typ               => Init_Typ,
                      In_Init_Proc      => Within_Init_Proc,
                      With_Default_Init => Has_Default_Init_Comps (N)
                                             or else
                                           Has_Task (Base_Type (Init_Typ))));

                  if Is_Constrained (Entity (A))
                    and then Has_Discriminants (Entity (A))
                  then
                     Check_Ancestor_Discriminants (Entity (A));
                  end if;
               end if;

            --  Handle calls to C++ constructors

            elsif Is_CPP_Constructor_Call (A) then
               Init_Typ := Etype (A);
               Ref := Convert_To (Init_Typ, New_Copy_Tree (Target));
               Set_Assignment_OK (Ref);

               Append_List_To (L,
                 Build_Initialization_Call (Loc,
                   Id_Ref            => Ref,
                   Typ               => Init_Typ,
                   In_Init_Proc      => Within_Init_Proc,
                   With_Default_Init => Has_Default_Init_Comps (N),
                   Constructor_Ref   => A));

            --  Ada 2005 (AI-287): If the ancestor part is an aggregate of
            --  limited type, a recursive call expands the ancestor. Note that
            --  in the limited case, the ancestor part must be either a
            --  function call (possibly qualified, or wrapped in an unchecked
            --  conversion) or aggregate (definitely qualified).
            --  The ancestor part can also be a function call (that may be
            --  transformed into an explicit dereference) or a qualification
            --  of one such.

            elsif Is_Limited_Type (Etype (A))
              and then Nkind_In (Unqualify (A), N_Aggregate,
                                                N_Extension_Aggregate)
            then
               Ancestor_Is_Expression := True;

               --  Set up  finalization data for enclosing record, because
               --  controlled subcomponents of the ancestor part will be
               --  attached to it.

               Gen_Ctrl_Actions_For_Aggr;

               Append_List_To (L,
                  Build_Record_Aggr_Code (
                    N                             => Unqualify (A),
                    Typ                           => Etype (Unqualify (A)),
                    Lhs                           => Target,
                    Flist                         => Flist,
                    Obj                           => Obj,
                    Is_Limited_Ancestor_Expansion => True));

            --  If the ancestor part is an expression "E", we generate

            --     T(tmp) := E;

            --  In Ada 2005, this includes the case of a (possibly qualified)
            --  limited function call. The assignment will turn into a
            --  build-in-place function call (for further details, see
            --  Make_Build_In_Place_Call_In_Assignment).

            else
               Ancestor_Is_Expression := True;
               Init_Typ := Etype (A);

               --  If the ancestor part is an aggregate, force its full
               --  expansion, which was delayed.

               if Nkind_In (Unqualify (A), N_Aggregate,
                                           N_Extension_Aggregate)
               then
                  Set_Analyzed (A, False);
                  Set_Analyzed (Expression (A), False);
               end if;

               Ref := Convert_To (Init_Typ, New_Copy_Tree (Target));
               Set_Assignment_OK (Ref);

               --  Make the assignment without usual controlled actions since
               --  we only want the post adjust but not the pre finalize here
               --  Add manual adjust when necessary.

               Assign := New_List (
                 Make_OK_Assignment_Statement (Loc,
                   Name       => Ref,
                   Expression => A));
               Set_No_Ctrl_Actions (First (Assign));

               --  Assign the tag now to make sure that the dispatching call in
               --  the subsequent deep_adjust works properly (unless VM_Target,
               --  where tags are implicit).

               if Tagged_Type_Expansion then
                  Instr :=
                    Make_OK_Assignment_Statement (Loc,
                      Name =>
                        Make_Selected_Component (Loc,
                          Prefix => New_Copy_Tree (Target),
                          Selector_Name =>
                            New_Reference_To
                              (First_Tag_Component (Base_Type (Typ)), Loc)),

                      Expression =>
                        Unchecked_Convert_To (RTE (RE_Tag),
                          New_Reference_To
                            (Node (First_Elmt
                               (Access_Disp_Table (Base_Type (Typ)))),
                             Loc)));

                  Set_Assignment_OK (Name (Instr));
                  Append_To (Assign, Instr);

                  --  Ada 2005 (AI-251): If tagged type has progenitors we must
                  --  also initialize tags of the secondary dispatch tables.

                  if Has_Interfaces (Base_Type (Typ)) then
                     Init_Secondary_Tags
                       (Typ        => Base_Type (Typ),
                        Target     => Target,
                        Stmts_List => Assign);
                  end if;
               end if;

               --  Call Adjust manually

               if Needs_Finalization (Etype (A))
                 and then not Is_Limited_Type (Etype (A))
               then
                  Append_List_To (Assign,
                    Make_Adjust_Call (
                      Ref         => New_Copy_Tree (Ref),
                      Typ         => Etype (A),
                      Flist_Ref   => New_Reference_To (
                        RTE (RE_Global_Final_List), Loc),
                      With_Attach => Make_Integer_Literal (Loc, 0)));
               end if;

               Append_To (L,
                 Make_Unsuppress_Block (Loc, Name_Discriminant_Check, Assign));

               if Has_Discriminants (Init_Typ) then
                  Check_Ancestor_Discriminants (Init_Typ);
               end if;
            end if;
         end;

      --  Normal case (not an extension aggregate)

      else
         --  Generate the discriminant expressions, component by component.
         --  If the base type is an unchecked union, the discriminants are
         --  unknown to the back-end and absent from a value of the type, so
         --  assignments for them are not emitted.

         if Has_Discriminants (Typ)
           and then not Is_Unchecked_Union (Base_Type (Typ))
         then
            --  If the type is derived, and constrains discriminants of the
            --  parent type, these discriminants are not components of the
            --  aggregate, and must be initialized explicitly. They are not
            --  visible components of the object, but can become visible with
            --  a view conversion to the ancestor.

            declare
               Btype      : Entity_Id;
               Parent_Type : Entity_Id;
               Disc        : Entity_Id;
               Discr_Val   : Elmt_Id;

            begin
               Btype := Base_Type (Typ);
               while Is_Derived_Type (Btype)
                  and then Present (Stored_Constraint (Btype))
               loop
                  Parent_Type := Etype (Btype);

                  Disc := First_Discriminant (Parent_Type);
                  Discr_Val :=
                    First_Elmt (Stored_Constraint (Base_Type (Typ)));
                  while Present (Discr_Val) loop

                     --  Only those discriminants of the parent that are not
                     --  renamed by discriminants of the derived type need to
                     --  be added explicitly.

                     if not Is_Entity_Name (Node (Discr_Val))
                       or else
                         Ekind (Entity (Node (Discr_Val))) /= E_Discriminant
                     then
                        Comp_Expr :=
                          Make_Selected_Component (Loc,
                            Prefix        => New_Copy_Tree (Target),
                            Selector_Name => New_Occurrence_Of (Disc, Loc));

                        Instr :=
                          Make_OK_Assignment_Statement (Loc,
                            Name       => Comp_Expr,
                            Expression => New_Copy_Tree (Node (Discr_Val)));

                        Set_No_Ctrl_Actions (Instr);
                        Append_To (L, Instr);
                     end if;

                     Next_Discriminant (Disc);
                     Next_Elmt (Discr_Val);
                  end loop;

                  Btype := Base_Type (Parent_Type);
               end loop;
            end;

            --  Generate discriminant init values for the visible discriminants

            declare
               Discriminant : Entity_Id;
               Discriminant_Value : Node_Id;

            begin
               Discriminant := First_Stored_Discriminant (Typ);
               while Present (Discriminant) loop
                  Comp_Expr :=
                    Make_Selected_Component (Loc,
                      Prefix        => New_Copy_Tree (Target),
                      Selector_Name => New_Occurrence_Of (Discriminant, Loc));

                  Discriminant_Value :=
                    Get_Discriminant_Value (
                      Discriminant,
                      N_Typ,
                      Discriminant_Constraint (N_Typ));

                  Instr :=
                    Make_OK_Assignment_Statement (Loc,
                      Name       => Comp_Expr,
                      Expression => New_Copy_Tree (Discriminant_Value));

                  Set_No_Ctrl_Actions (Instr);
                  Append_To (L, Instr);

                  Next_Stored_Discriminant (Discriminant);
               end loop;
            end;
         end if;
      end if;

      --  For CPP types we generate an implicit call to the C++ default
      --  constructor to ensure the proper initialization of the _Tag
      --  component.

      if Is_CPP_Class (Root_Type (Typ))
        and then CPP_Num_Prims (Typ) > 0
      then
         Invoke_Constructor : declare
            CPP_Parent : constant Entity_Id :=
                           Enclosing_CPP_Parent (Typ);

            procedure Invoke_IC_Proc (T : Entity_Id);
            --  Recursive routine used to climb to parents. Required because
            --  parents must be initialized before descendants to ensure
            --  propagation of inherited C++ slots.

            --------------------
            -- Invoke_IC_Proc --
            --------------------

            procedure Invoke_IC_Proc (T : Entity_Id) is
            begin
               --  Avoid generating extra calls. Initialization required
               --  only for types defined from the level of derivation of
               --  type of the constructor and the type of the aggregate.

               if T = CPP_Parent then
                  return;
               end if;

               Invoke_IC_Proc (Etype (T));

               --  Generate call to the IC routine

               if Present (CPP_Init_Proc (T)) then
                  Append_To (L,
                    Make_Procedure_Call_Statement (Loc,
                      New_Reference_To (CPP_Init_Proc (T), Loc)));
               end if;
            end Invoke_IC_Proc;

         --  Start of processing for Invoke_Constructor

         begin
            --  Implicit invocation of the C++ constructor

            if Nkind (N) = N_Aggregate then
               Append_To (L,
                 Make_Procedure_Call_Statement (Loc,
                   Name =>
                     New_Reference_To
                       (Base_Init_Proc (CPP_Parent), Loc),
                   Parameter_Associations => New_List (
                     Unchecked_Convert_To (CPP_Parent,
                       New_Copy_Tree (Lhs)))));
            end if;

            Invoke_IC_Proc (Typ);
         end Invoke_Constructor;
      end if;

      --  Generate the assignments, component by component

      --    tmp.comp1 := Expr1_From_Aggr;
      --    tmp.comp2 := Expr2_From_Aggr;
      --    ....

      Comp := First (Component_Associations (N));
      while Present (Comp) loop
         Selector := Entity (First (Choices (Comp)));

         --  C++ constructors

         if Is_CPP_Constructor_Call (Expression (Comp)) then
            Append_List_To (L,
              Build_Initialization_Call (Loc,
                Id_Ref            => Make_Selected_Component (Loc,
                                       Prefix        => New_Copy_Tree (Target),
                                       Selector_Name =>
                                         New_Occurrence_Of (Selector, Loc)),
                Typ               => Etype (Selector),
                Enclos_Type       => Typ,
                With_Default_Init => True,
                Constructor_Ref   => Expression (Comp)));

         --  Ada 2005 (AI-287): For each default-initialized component generate
         --  a call to the corresponding IP subprogram if available.

         elsif Box_Present (Comp)
           and then Has_Non_Null_Base_Init_Proc (Etype (Selector))
         then
            if Ekind (Selector) /= E_Discriminant then
               Gen_Ctrl_Actions_For_Aggr;
            end if;

            --  Ada 2005 (AI-287): If the component type has tasks then
            --  generate the activation chain and master entities (except
            --  in case of an allocator because in that case these entities
            --  are generated by Build_Task_Allocate_Block_With_Init_Stmts).

            declare
               Ctype            : constant Entity_Id := Etype (Selector);
               Inside_Allocator : Boolean            := False;
               P                : Node_Id            := Parent (N);

            begin
               if Is_Task_Type (Ctype) or else Has_Task (Ctype) then
                  while Present (P) loop
                     if Nkind (P) = N_Allocator then
                        Inside_Allocator := True;
                        exit;
                     end if;

                     P := Parent (P);
                  end loop;

                  if not Inside_Init_Proc and not Inside_Allocator then
                     Build_Activation_Chain_Entity (N);
                  end if;
               end if;
            end;

            Append_List_To (L,
              Build_Initialization_Call (Loc,
                Id_Ref            => Make_Selected_Component (Loc,
                                       Prefix        => New_Copy_Tree (Target),
                                       Selector_Name =>
                                         New_Occurrence_Of (Selector, Loc)),
                Typ               => Etype (Selector),
                Enclos_Type       => Typ,
                With_Default_Init => True));

         --  Prepare for component assignment

         elsif Ekind (Selector) /= E_Discriminant
           or else Nkind (N) = N_Extension_Aggregate
         then
            --  All the discriminants have now been assigned

            --  This is now a good moment to initialize and attach all the
            --  controllers. Their position may depend on the discriminants.

            if Ekind (Selector) /= E_Discriminant then
               Gen_Ctrl_Actions_For_Aggr;
            end if;

            Comp_Type := Etype (Selector);
            Comp_Expr :=
              Make_Selected_Component (Loc,
                Prefix        => New_Copy_Tree (Target),
                Selector_Name => New_Occurrence_Of (Selector, Loc));

            if Nkind (Expression (Comp)) = N_Qualified_Expression then
               Expr_Q := Expression (Expression (Comp));
            else
               Expr_Q := Expression (Comp);
            end if;

            --  The controller is the one of the parent type defining the
            --  component (in case of inherited components).

            if Needs_Finalization (Comp_Type) then
               Internal_Final_List :=
                 Make_Selected_Component (Loc,
                   Prefix        => Convert_To
                     (Scope (Original_Record_Component (Selector)),
                      New_Copy_Tree (Target)),
                   Selector_Name => Make_Identifier (Loc, Name_uController));

               Internal_Final_List :=
                 Make_Selected_Component (Loc,
                   Prefix        => Internal_Final_List,
                   Selector_Name => Make_Identifier (Loc, Name_F));

               --  The internal final list can be part of a constant object

               Set_Assignment_OK (Internal_Final_List);

            else
               Internal_Final_List := Empty;
            end if;

            --  Now either create the assignment or generate the code for the
            --  inner aggregate top-down.

            if Is_Delayed_Aggregate (Expr_Q) then

               --  We have the following case of aggregate nesting inside
               --  an object declaration:

               --    type Arr_Typ is array (Integer range <>) of ...;

               --    type Rec_Typ (...) is record
               --       Obj_Arr_Typ : Arr_Typ (A .. B);
               --    end record;

               --    Obj_Rec_Typ : Rec_Typ := (...,
               --      Obj_Arr_Typ => (X => (...), Y => (...)));

               --  The length of the ranges of the aggregate and Obj_Add_Typ
               --  are equal (B - A = Y - X), but they do not coincide (X /=
               --  A and B /= Y). This case requires array sliding which is
               --  performed in the following manner:

               --    subtype Arr_Sub is Arr_Typ (X .. Y);
               --    Temp : Arr_Sub;
               --    Temp (X) := (...);
               --    ...
               --    Temp (Y) := (...);
               --    Obj_Rec_Typ.Obj_Arr_Typ := Temp;

               if Ekind (Comp_Type) = E_Array_Subtype
                 and then Is_Int_Range_Bounds (Aggregate_Bounds (Expr_Q))
                 and then Is_Int_Range_Bounds (First_Index (Comp_Type))
                 and then not
                   Compatible_Int_Bounds
                     (Agg_Bounds => Aggregate_Bounds (Expr_Q),
                      Typ_Bounds => First_Index (Comp_Type))
               then
                  --  Create the array subtype with bounds equal to those of
                  --  the corresponding aggregate.

                  declare
                     SubE : constant Entity_Id := Make_Temporary (Loc, 'T');

                     SubD : constant Node_Id :=
                              Make_Subtype_Declaration (Loc,
                                Defining_Identifier => SubE,
                                Subtype_Indication  =>
                                  Make_Subtype_Indication (Loc,
                                    Subtype_Mark =>
                                      New_Reference_To
                                        (Etype (Comp_Type), Loc),
                                    Constraint =>
                                      Make_Index_Or_Discriminant_Constraint
                                        (Loc,
                                         Constraints => New_List (
                                          New_Copy_Tree
                                            (Aggregate_Bounds (Expr_Q))))));

                     --  Create a temporary array of the above subtype which
                     --  will be used to capture the aggregate assignments.

                     TmpE : constant Entity_Id := Make_Temporary (Loc, 'A', N);

                     TmpD : constant Node_Id :=
                              Make_Object_Declaration (Loc,
                                Defining_Identifier => TmpE,
                                Object_Definition   =>
                                  New_Reference_To (SubE, Loc));

                  begin
                     Set_No_Initialization (TmpD);
                     Append_To (L, SubD);
                     Append_To (L, TmpD);

                     --  Expand aggregate into assignments to the temp array

                     Append_List_To (L,
                       Late_Expansion (Expr_Q, Comp_Type,
                         New_Reference_To (TmpE, Loc), Internal_Final_List));

                     --  Slide

                     Append_To (L,
                       Make_Assignment_Statement (Loc,
                         Name       => New_Copy_Tree (Comp_Expr),
                         Expression => New_Reference_To (TmpE, Loc)));

                     --  Do not pass the original aggregate to Gigi as is,
                     --  since it will potentially clobber the front or the end
                     --  of the array. Setting the expression to empty is safe
                     --  since all aggregates are expanded into assignments.

                     if Present (Obj) then
                        Set_Expression (Parent (Obj), Empty);
                     end if;
                  end;

               --  Normal case (sliding not required)

               else
                  Append_List_To (L,
                    Late_Expansion (Expr_Q, Comp_Type, Comp_Expr,
                      Internal_Final_List));
               end if;

            --  Expr_Q is not delayed aggregate

            else
               if Has_Discriminants (Typ) then
                  Replace_Discriminants (Expr_Q);
               end if;

               Instr :=
                 Make_OK_Assignment_Statement (Loc,
                   Name       => Comp_Expr,
                   Expression => Expr_Q);

               Set_No_Ctrl_Actions (Instr);
               Append_To (L, Instr);

               --  Adjust the tag if tagged (because of possible view
               --  conversions), unless compiling for a VM where tags are
               --  implicit.

               --    tmp.comp._tag := comp_typ'tag;

               if Is_Tagged_Type (Comp_Type)
                 and then Tagged_Type_Expansion
               then
                  Instr :=
                    Make_OK_Assignment_Statement (Loc,
                      Name =>
                        Make_Selected_Component (Loc,
                          Prefix =>  New_Copy_Tree (Comp_Expr),
                          Selector_Name =>
                            New_Reference_To
                              (First_Tag_Component (Comp_Type), Loc)),

                      Expression =>
                        Unchecked_Convert_To (RTE (RE_Tag),
                          New_Reference_To
                            (Node (First_Elmt (Access_Disp_Table (Comp_Type))),
                             Loc)));

                  Append_To (L, Instr);
               end if;

               --  Adjust and Attach the component to the proper controller

               --     Adjust (tmp.comp);
               --     Attach_To_Final_List (tmp.comp,
               --       comp_typ (tmp)._record_controller.f)

               if Needs_Finalization (Comp_Type)
                 and then not Is_Limited_Type (Comp_Type)
               then
                  Append_List_To (L,
                    Make_Adjust_Call (
                      Ref         => New_Copy_Tree (Comp_Expr),
                      Typ         => Comp_Type,
                      Flist_Ref   => Internal_Final_List,
                      With_Attach => Make_Integer_Literal (Loc, 1)));
               end if;
            end if;

         --  ???

         elsif Ekind (Selector) = E_Discriminant
           and then Nkind (N) /= N_Extension_Aggregate
           and then Nkind (Parent (N)) = N_Component_Association
           and then Is_Constrained (Typ)
         then
            --  We must check that the discriminant value imposed by the
            --  context is the same as the value given in the subaggregate,
            --  because after the expansion into assignments there is no
            --  record on which to perform a regular discriminant check.

            declare
               D_Val : Elmt_Id;
               Disc  : Entity_Id;

            begin
               D_Val := First_Elmt (Discriminant_Constraint (Typ));
               Disc  := First_Discriminant (Typ);
               while Chars (Disc) /= Chars (Selector) loop
                  Next_Discriminant (Disc);
                  Next_Elmt (D_Val);
               end loop;

               pragma Assert (Present (D_Val));

               --  This check cannot performed for components that are
               --  constrained by a current instance, because this is not a
               --  value that can be compared with the actual constraint.

               if Nkind (Node (D_Val)) /= N_Attribute_Reference
                 or else not Is_Entity_Name (Prefix (Node (D_Val)))
                 or else not Is_Type (Entity (Prefix (Node (D_Val))))
               then
                  Append_To (L,
                  Make_Raise_Constraint_Error (Loc,
                    Condition =>
                      Make_Op_Ne (Loc,
                        Left_Opnd => New_Copy_Tree (Node (D_Val)),
                        Right_Opnd => Expression (Comp)),
                      Reason => CE_Discriminant_Check_Failed));

               else
                  --  Find self-reference in previous discriminant assignment,
                  --  and replace with proper expression.

                  declare
                     Ass : Node_Id;

                  begin
                     Ass := First (L);
                     while Present (Ass) loop
                        if Nkind (Ass) = N_Assignment_Statement
                          and then Nkind (Name (Ass)) = N_Selected_Component
                          and then Chars (Selector_Name (Name (Ass))) =
                             Chars (Disc)
                        then
                           Set_Expression
                             (Ass, New_Copy_Tree (Expression (Comp)));
                           exit;
                        end if;
                        Next (Ass);
                     end loop;
                  end;
               end if;
            end;
         end if;

         Next (Comp);
      end loop;

      --  If the type is tagged, the tag needs to be initialized (unless
      --  compiling for the Java VM where tags are implicit). It is done
      --  late in the initialization process because in some cases, we call
      --  the init proc of an ancestor which will not leave out the right tag

      if Ancestor_Is_Expression then
         null;

      --  For CPP types we generated a call to the C++ default constructor
      --  before the components have been initialized to ensure the proper
      --  initialization of the _Tag component (see above).

      elsif Is_CPP_Class (Typ) then
         null;

      elsif Is_Tagged_Type (Typ) and then Tagged_Type_Expansion then
         Instr :=
           Make_OK_Assignment_Statement (Loc,
             Name =>
               Make_Selected_Component (Loc,
                 Prefix => New_Copy_Tree (Target),
                 Selector_Name =>
                   New_Reference_To
                     (First_Tag_Component (Base_Type (Typ)), Loc)),

             Expression =>
               Unchecked_Convert_To (RTE (RE_Tag),
                 New_Reference_To
                   (Node (First_Elmt (Access_Disp_Table (Base_Type (Typ)))),
                    Loc)));

         Append_To (L, Instr);

         --  Ada 2005 (AI-251): If the tagged type has been derived from
         --  abstract interfaces we must also initialize the tags of the
         --  secondary dispatch tables.

         if Has_Interfaces (Base_Type (Typ)) then
            Init_Secondary_Tags
              (Typ        => Base_Type (Typ),
               Target     => Target,
               Stmts_List => L);
         end if;
      end if;

      --  If the controllers have not been initialized yet (by lack of non-
      --  discriminant components), let's do it now.

      Gen_Ctrl_Actions_For_Aggr;

      return L;
   end Build_Record_Aggr_Code;

   -------------------------------
   -- Convert_Aggr_In_Allocator --
   -------------------------------

   procedure Convert_Aggr_In_Allocator
     (Alloc :  Node_Id;
      Decl  :  Node_Id;
      Aggr  :  Node_Id)
   is
      Loc  : constant Source_Ptr := Sloc (Aggr);
      Typ  : constant Entity_Id  := Etype (Aggr);
      Temp : constant Entity_Id  := Defining_Identifier (Decl);

      Occ  : constant Node_Id :=
               Unchecked_Convert_To (Typ,
                 Make_Explicit_Dereference (Loc,
                   New_Reference_To (Temp, Loc)));

      Access_Type : constant Entity_Id := Etype (Temp);
      Flist       : Entity_Id;

   begin
      --  If the allocator is for an access discriminant, there is no
      --  finalization list for the anonymous access type, and the eventual
      --  finalization of the object is handled through the coextension
      --  mechanism. If the enclosing object is not dynamically allocated,
      --  the access discriminant is itself placed on the stack. Otherwise,
      --  some other finalization list is used (see exp_ch4.adb).

      --  Decl has been inserted in the code ahead of the allocator, using
      --  Insert_Actions. We use Insert_Actions below as well, to ensure that
      --  subsequent insertions are done in the proper order. Using (for
      --  example) Insert_Actions_After to place the expanded aggregate
      --  immediately after Decl may lead to out-of-order references if the
      --  allocator has generated a finalization list, as when the designated
      --  object is controlled and there is an open transient scope.

      if Ekind (Access_Type) = E_Anonymous_Access_Type
        and then Nkind (Associated_Node_For_Itype (Access_Type)) =
                                              N_Discriminant_Specification
      then
         Flist := Empty;

      elsif Needs_Finalization (Typ) then
         Flist := Find_Final_List (Access_Type);

      --  Otherwise there are no controlled actions to be performed.

      else
         Flist := Empty;
      end if;

      if Is_Array_Type (Typ) then
         Convert_Array_Aggr_In_Allocator (Decl, Aggr, Occ);

      elsif Has_Default_Init_Comps (Aggr) then
         declare
            L          : constant List_Id := New_List;
            Init_Stmts : List_Id;

         begin
            Init_Stmts :=
              Late_Expansion
                (Aggr, Typ, Occ,
                 Flist,
                 Associated_Final_Chain (Base_Type (Access_Type)));

            --  ??? Dubious actual for Obj: expect 'the original object being
            --  initialized'

            if Has_Task (Typ) then
               Build_Task_Allocate_Block_With_Init_Stmts (L, Aggr, Init_Stmts);
               Insert_Actions (Alloc, L);
            else
               Insert_Actions (Alloc, Init_Stmts);
            end if;
         end;

      else
         Insert_Actions (Alloc,
           Late_Expansion
             (Aggr, Typ, Occ, Flist,
              Associated_Final_Chain (Base_Type (Access_Type))));

         --  ??? Dubious actual for Obj: expect 'the original object being
         --  initialized'

      end if;
   end Convert_Aggr_In_Allocator;

   --------------------------------
   -- Convert_Aggr_In_Assignment --
   --------------------------------

   procedure Convert_Aggr_In_Assignment (N : Node_Id) is
      Aggr : Node_Id            := Expression (N);
      Typ  : constant Entity_Id := Etype (Aggr);
      Occ  : constant Node_Id   := New_Copy_Tree (Name (N));

   begin
      if Nkind (Aggr) = N_Qualified_Expression then
         Aggr := Expression (Aggr);
      end if;

      Insert_Actions_After (N,
        Late_Expansion
          (Aggr, Typ, Occ,
           Find_Final_List (Typ, New_Copy_Tree (Occ))));
   end Convert_Aggr_In_Assignment;

   ---------------------------------
   -- Convert_Aggr_In_Object_Decl --
   ---------------------------------

   procedure Convert_Aggr_In_Object_Decl (N : Node_Id) is
      Obj  : constant Entity_Id  := Defining_Identifier (N);
      Aggr : Node_Id             := Expression (N);
      Loc  : constant Source_Ptr := Sloc (Aggr);
      Typ  : constant Entity_Id  := Etype (Aggr);
      Occ  : constant Node_Id    := New_Occurrence_Of (Obj, Loc);

      function Discriminants_Ok return Boolean;
      --  If the object type is constrained, the discriminants in the
      --  aggregate must be checked against the discriminants of the subtype.
      --  This cannot be done using Apply_Discriminant_Checks because after
      --  expansion there is no aggregate left to check.

      ----------------------
      -- Discriminants_Ok --
      ----------------------

      function Discriminants_Ok return Boolean is
         Cond  : Node_Id := Empty;
         Check : Node_Id;
         D     : Entity_Id;
         Disc1 : Elmt_Id;
         Disc2 : Elmt_Id;
         Val1  : Node_Id;
         Val2  : Node_Id;

      begin
         D := First_Discriminant (Typ);
         Disc1 := First_Elmt (Discriminant_Constraint (Typ));
         Disc2 := First_Elmt (Discriminant_Constraint (Etype (Obj)));
         while Present (Disc1) and then Present (Disc2) loop
            Val1 := Node (Disc1);
            Val2 := Node (Disc2);

            if not Is_OK_Static_Expression (Val1)
              or else not Is_OK_Static_Expression (Val2)
            then
               Check := Make_Op_Ne (Loc,
                 Left_Opnd  => Duplicate_Subexpr (Val1),
                 Right_Opnd => Duplicate_Subexpr (Val2));

               if No (Cond) then
                  Cond := Check;

               else
                  Cond := Make_Or_Else (Loc,
                    Left_Opnd => Cond,
                    Right_Opnd => Check);
               end if;

            elsif Expr_Value (Val1) /= Expr_Value (Val2) then
               Apply_Compile_Time_Constraint_Error (Aggr,
                 Msg    => "incorrect value for discriminant&?",
                 Reason => CE_Discriminant_Check_Failed,
                 Ent    => D);
               return False;
            end if;

            Next_Discriminant (D);
            Next_Elmt (Disc1);
            Next_Elmt (Disc2);
         end loop;

         --  If any discriminant constraint is non-static, emit a check

         if Present (Cond) then
            Insert_Action (N,
              Make_Raise_Constraint_Error (Loc,
                Condition => Cond,
                Reason => CE_Discriminant_Check_Failed));
         end if;

         return True;
      end Discriminants_Ok;

   --  Start of processing for Convert_Aggr_In_Object_Decl

   begin
      Set_Assignment_OK (Occ);

      if Nkind (Aggr) = N_Qualified_Expression then
         Aggr := Expression (Aggr);
      end if;

      if Has_Discriminants (Typ)
        and then Typ /= Etype (Obj)
        and then Is_Constrained (Etype (Obj))
        and then not Discriminants_Ok
      then
         return;
      end if;

      --  If the context is an extended return statement, it has its own
      --  finalization machinery (i.e. works like a transient scope) and
      --  we do not want to create an additional one, because objects on
      --  the finalization list of the return must be moved to the caller's
      --  finalization list to complete the return.

      --  However, if the aggregate is limited, it is built in place, and the
      --  controlled components are not assigned to intermediate temporaries
      --  so there is no need for a transient scope in this case either.

      if Requires_Transient_Scope (Typ)
        and then Ekind (Current_Scope) /= E_Return_Statement
        and then not Is_Limited_Type (Typ)
      then
         Establish_Transient_Scope
           (Aggr,
            Sec_Stack =>
              Is_Controlled (Typ) or else Has_Controlled_Component (Typ));
      end if;

      Insert_Actions_After (N, Late_Expansion (Aggr, Typ, Occ, Obj => Obj));
      Set_No_Initialization (N);
      Initialize_Discriminants (N, Typ);
   end Convert_Aggr_In_Object_Decl;

   -------------------------------------
   -- Convert_Array_Aggr_In_Allocator --
   -------------------------------------

   procedure Convert_Array_Aggr_In_Allocator
     (Decl   : Node_Id;
      Aggr   : Node_Id;
      Target : Node_Id)
   is
      Aggr_Code : List_Id;
      Typ       : constant Entity_Id := Etype (Aggr);
      Ctyp      : constant Entity_Id := Component_Type (Typ);

   begin
      --  The target is an explicit dereference of the allocated object.
      --  Generate component assignments to it, as for an aggregate that
      --  appears on the right-hand side of an assignment statement.

      Aggr_Code :=
        Build_Array_Aggr_Code (Aggr,
          Ctype       => Ctyp,
          Index       => First_Index (Typ),
          Into        => Target,
          Scalar_Comp => Is_Scalar_Type (Ctyp));

      Insert_Actions_After (Decl, Aggr_Code);
   end Convert_Array_Aggr_In_Allocator;

   ----------------------------
   -- Convert_To_Assignments --
   ----------------------------

   procedure Convert_To_Assignments (N : Node_Id; Typ : Entity_Id) is
      Loc  : constant Source_Ptr := Sloc (N);
      T    : Entity_Id;
      Temp : Entity_Id;

      Instr       : Node_Id;
      Target_Expr : Node_Id;
      Parent_Kind : Node_Kind;
      Unc_Decl    : Boolean := False;
      Parent_Node : Node_Id;

   begin
      pragma Assert (not Is_Static_Dispatch_Table_Aggregate (N));
      pragma Assert (Is_Record_Type (Typ));

      Parent_Node := Parent (N);
      Parent_Kind := Nkind (Parent_Node);

      if Parent_Kind = N_Qualified_Expression then

         --  Check if we are in a unconstrained declaration because in this
         --  case the current delayed expansion mechanism doesn't work when
         --  the declared object size depend on the initializing expr.

         begin
            Parent_Node := Parent (Parent_Node);
            Parent_Kind := Nkind (Parent_Node);

            if Parent_Kind = N_Object_Declaration then
               Unc_Decl :=
                 not Is_Entity_Name (Object_Definition (Parent_Node))
                   or else Has_Discriminants
                             (Entity (Object_Definition (Parent_Node)))
                   or else Is_Class_Wide_Type
                             (Entity (Object_Definition (Parent_Node)));
            end if;
         end;
      end if;

      --  Just set the Delay flag in the cases where the transformation will be
      --  done top down from above.

      if False

         --  Internal aggregate (transformed when expanding the parent)

         or else Parent_Kind = N_Aggregate
         or else Parent_Kind = N_Extension_Aggregate
         or else Parent_Kind = N_Component_Association

         --  Allocator (see Convert_Aggr_In_Allocator)

         or else Parent_Kind = N_Allocator

         --  Object declaration (see Convert_Aggr_In_Object_Decl)

         or else (Parent_Kind = N_Object_Declaration and then not Unc_Decl)

         --  Safe assignment (see Convert_Aggr_Assignments). So far only the
         --  assignments in init procs are taken into account.

         or else (Parent_Kind = N_Assignment_Statement
                   and then Inside_Init_Proc)

         --  (Ada 2005) An inherently limited type in a return statement,
         --  which will be handled in a build-in-place fashion, and may be
         --  rewritten as an extended return and have its own finalization
         --  machinery. In the case of a simple return, the aggregate needs
         --  to be delayed until the scope for the return statement has been
         --  created, so that any finalization chain will be associated with
         --  that scope. For extended returns, we delay expansion to avoid the
         --  creation of an unwanted transient scope that could result in
         --  premature finalization of the return object (which is built in
         --  in place within the caller's scope).

         or else
           (Is_Immutably_Limited_Type (Typ)
             and then
               (Nkind (Parent (Parent_Node)) = N_Extended_Return_Statement
                 or else Nkind (Parent_Node) = N_Simple_Return_Statement))
      then
         Set_Expansion_Delayed (N);
         return;
      end if;

      if Requires_Transient_Scope (Typ) then
         Establish_Transient_Scope
           (N, Sec_Stack =>
                 Is_Controlled (Typ) or else Has_Controlled_Component (Typ));
      end if;

      --  If the aggregate is non-limited, create a temporary. If it is limited
      --  and the context is an assignment, this is a subaggregate for an
      --  enclosing aggregate being expanded. It must be built in place, so use
      --  the target of the current assignment.

      if Is_Limited_Type (Typ)
        and then Nkind (Parent (N)) = N_Assignment_Statement
      then
         Target_Expr := New_Copy_Tree (Name (Parent (N)));
         Insert_Actions
           (Parent (N), Build_Record_Aggr_Code (N, Typ, Target_Expr));
         Rewrite (Parent (N), Make_Null_Statement (Loc));

      else
         Temp := Make_Temporary (Loc, 'A', N);

         --  If the type inherits unknown discriminants, use the view with
         --  known discriminants if available.

         if Has_Unknown_Discriminants (Typ)
            and then Present (Underlying_Record_View (Typ))
         then
            T := Underlying_Record_View (Typ);
         else
            T := Typ;
         end if;

         Instr :=
           Make_Object_Declaration (Loc,
             Defining_Identifier => Temp,
             Object_Definition   => New_Occurrence_Of (T, Loc));

         Set_No_Initialization (Instr);
         Insert_Action (N, Instr);
         Initialize_Discriminants (Instr, T);
         Target_Expr := New_Occurrence_Of (Temp, Loc);
         Insert_Actions (N, Build_Record_Aggr_Code (N, T, Target_Expr));
         Rewrite (N, New_Occurrence_Of (Temp, Loc));
         Analyze_And_Resolve (N, T);
      end if;
   end Convert_To_Assignments;

   ---------------------------
   -- Convert_To_Positional --
   ---------------------------

   procedure Convert_To_Positional
     (N                    : Node_Id;
      Max_Others_Replicate : Nat     := 5;
      Handle_Bit_Packed    : Boolean := False)
   is
      Typ : constant Entity_Id := Etype (N);

      Static_Components : Boolean := True;

      procedure Check_Static_Components;
      --  Check whether all components of the aggregate are compile-time known
      --  values, and can be passed as is to the back-end without further
      --  expansion.

      function Flatten
        (N   : Node_Id;
         Ix  : Node_Id;
         Ixb : Node_Id) return Boolean;
      --  Convert the aggregate into a purely positional form if possible. On
      --  entry the bounds of all dimensions are known to be static, and the
      --  total number of components is safe enough to expand.

      function Is_Flat (N : Node_Id; Dims : Int) return Boolean;
      --  Return True iff the array N is flat (which is not trivial in the case
      --  of multidimensional aggregates).

      -----------------------------
      -- Check_Static_Components --
      -----------------------------

      procedure Check_Static_Components is
         Expr : Node_Id;

      begin
         Static_Components := True;

         if Nkind (N) = N_String_Literal then
            null;

         elsif Present (Expressions (N)) then
            Expr := First (Expressions (N));
            while Present (Expr) loop
               if Nkind (Expr) /= N_Aggregate
                 or else not Compile_Time_Known_Aggregate (Expr)
                 or else Expansion_Delayed (Expr)
               then
                  Static_Components := False;
                  exit;
               end if;

               Next (Expr);
            end loop;
         end if;

         if Nkind (N) = N_Aggregate
           and then  Present (Component_Associations (N))
         then
            Expr := First (Component_Associations (N));
            while Present (Expr) loop
               if Nkind_In (Expression (Expr), N_Integer_Literal,
                                               N_Real_Literal)
               then
                  null;

               elsif Is_Entity_Name (Expression (Expr))
                 and then Present (Entity (Expression (Expr)))
                 and then Ekind (Entity (Expression (Expr))) =
                   E_Enumeration_Literal
               then
                  null;

               elsif Nkind (Expression (Expr)) /= N_Aggregate
                 or else not Compile_Time_Known_Aggregate (Expression (Expr))
                 or else Expansion_Delayed (Expression (Expr))
               then
                  Static_Components := False;
                  exit;
               end if;

               Next (Expr);
            end loop;
         end if;
      end Check_Static_Components;

      -------------
      -- Flatten --
      -------------

      function Flatten
        (N   : Node_Id;
         Ix  : Node_Id;
         Ixb : Node_Id) return Boolean
      is
         Loc : constant Source_Ptr := Sloc (N);
         Blo : constant Node_Id    := Type_Low_Bound (Etype (Ixb));
         Lo  : constant Node_Id    := Type_Low_Bound (Etype (Ix));
         Hi  : constant Node_Id    := Type_High_Bound (Etype (Ix));
         Lov : Uint;
         Hiv : Uint;

      begin
         if Nkind (Original_Node (N)) = N_String_Literal then
            return True;
         end if;

         if not Compile_Time_Known_Value (Lo)
           or else not Compile_Time_Known_Value (Hi)
         then
            return False;
         end if;

         Lov := Expr_Value (Lo);
         Hiv := Expr_Value (Hi);

         if Hiv < Lov
           or else not Compile_Time_Known_Value (Blo)
         then
            return False;
         end if;

         --  Determine if set of alternatives is suitable for conversion and
         --  build an array containing the values in sequence.

         declare
            Vals : array (UI_To_Int (Lov) .. UI_To_Int (Hiv))
                     of Node_Id := (others => Empty);
            --  The values in the aggregate sorted appropriately

            Vlist : List_Id;
            --  Same data as Vals in list form

            Rep_Count : Nat;
            --  Used to validate Max_Others_Replicate limit

            Elmt         : Node_Id;
            Num          : Int := UI_To_Int (Lov);
            Choice_Index : Int;
            Choice       : Node_Id;
            Lo, Hi       : Node_Id;

         begin
            if Present (Expressions (N)) then
               Elmt := First (Expressions (N));
               while Present (Elmt) loop
                  if Nkind (Elmt) = N_Aggregate
                    and then Present (Next_Index (Ix))
                    and then
                      not Flatten (Elmt, Next_Index (Ix), Next_Index (Ixb))
                  then
                     return False;
                  end if;

                  Vals (Num) := Relocate_Node (Elmt);
                  Num := Num + 1;

                  Next (Elmt);
               end loop;
            end if;

            if No (Component_Associations (N)) then
               return True;
            end if;

            Elmt := First (Component_Associations (N));

            if Nkind (Expression (Elmt)) = N_Aggregate then
               if Present (Next_Index (Ix))
                 and then
                   not Flatten
                        (Expression (Elmt), Next_Index (Ix), Next_Index (Ixb))
               then
                  return False;
               end if;
            end if;

            Component_Loop : while Present (Elmt) loop
               Choice := First (Choices (Elmt));
               Choice_Loop : while Present (Choice) loop

                  --  If we have an others choice, fill in the missing elements
                  --  subject to the limit established by Max_Others_Replicate.

                  if Nkind (Choice) = N_Others_Choice then
                     Rep_Count := 0;

                     for J in Vals'Range loop
                        if No (Vals (J)) then
                           Vals (J) := New_Copy_Tree (Expression (Elmt));
                           Rep_Count := Rep_Count + 1;

                           --  Check for maximum others replication. Note that
                           --  we skip this test if either of the restrictions
                           --  No_Elaboration_Code or No_Implicit_Loops is
                           --  active, if this is a preelaborable unit or a
                           --  predefined unit. This ensures that predefined
                           --  units get the same level of constant folding in
                           --  Ada 95 and Ada 05, where their categorization
                           --  has changed.

                           declare
                              P : constant Entity_Id :=
                                    Cunit_Entity (Current_Sem_Unit);

                           begin
                              --  Check if duplication OK and if so continue
                              --  processing.

                              if Restriction_Active (No_Elaboration_Code)
                                or else Restriction_Active (No_Implicit_Loops)
                                or else Is_Preelaborated (P)
                                or else (Ekind (P) = E_Package_Body
                                          and then
                                            Is_Preelaborated (Spec_Entity (P)))
                                or else
                                  Is_Predefined_File_Name
                                    (Unit_File_Name (Get_Source_Unit (P)))
                              then
                                 null;

                              --  If duplication not OK, then we return False
                              --  if the replication count is too high

                              elsif Rep_Count > Max_Others_Replicate then
                                 return False;

                              --  Continue on if duplication not OK, but the
                              --  replication count is not excessive.

                              else
                                 null;
                              end if;
                           end;
                        end if;
                     end loop;

                     exit Component_Loop;

                  --  Case of a subtype mark, identifier or expanded name

                  elsif Is_Entity_Name (Choice)
                    and then Is_Type (Entity (Choice))
                  then
                     Lo := Type_Low_Bound  (Etype (Choice));
                     Hi := Type_High_Bound (Etype (Choice));

                  --  Case of subtype indication

                  elsif Nkind (Choice) = N_Subtype_Indication then
                     Lo := Low_Bound  (Range_Expression (Constraint (Choice)));
                     Hi := High_Bound (Range_Expression (Constraint (Choice)));

                  --  Case of a range

                  elsif Nkind (Choice) = N_Range then
                     Lo := Low_Bound (Choice);
                     Hi := High_Bound (Choice);

                  --  Normal subexpression case

                  else pragma Assert (Nkind (Choice) in N_Subexpr);
                     if not Compile_Time_Known_Value (Choice) then
                        return False;

                     else
                        Choice_Index := UI_To_Int (Expr_Value (Choice));
                        if Choice_Index in Vals'Range then
                           Vals (Choice_Index) :=
                             New_Copy_Tree (Expression (Elmt));
                           goto Continue;

                        else
                           --  Choice is statically out-of-range, will be
                           --  rewritten to raise Constraint_Error.

                           return False;
                        end if;
                     end if;
                  end if;

                  --  Range cases merge with Lo,Hi set

                  if not Compile_Time_Known_Value (Lo)
                       or else
                     not Compile_Time_Known_Value (Hi)
                  then
                     return False;
                  else
                     for J in UI_To_Int (Expr_Value (Lo)) ..
                              UI_To_Int (Expr_Value (Hi))
                     loop
                        Vals (J) := New_Copy_Tree (Expression (Elmt));
                     end loop;
                  end if;

               <<Continue>>
                  Next (Choice);
               end loop Choice_Loop;

               Next (Elmt);
            end loop Component_Loop;

            --  If we get here the conversion is possible

            Vlist := New_List;
            for J in Vals'Range loop
               Append (Vals (J), Vlist);
            end loop;

            Rewrite (N, Make_Aggregate (Loc, Expressions => Vlist));
            Set_Aggregate_Bounds (N, Aggregate_Bounds (Original_Node (N)));
            return True;
         end;
      end Flatten;

      -------------
      -- Is_Flat --
      -------------

      function Is_Flat (N : Node_Id; Dims : Int) return Boolean is
         Elmt : Node_Id;

      begin
         if Dims = 0 then
            return True;

         elsif Nkind (N) = N_Aggregate then
            if Present (Component_Associations (N)) then
               return False;

            else
               Elmt := First (Expressions (N));
               while Present (Elmt) loop
                  if not Is_Flat (Elmt, Dims - 1) then
                     return False;
                  end if;

                  Next (Elmt);
               end loop;

               return True;
            end if;
         else
            return True;
         end if;
      end Is_Flat;

   --  Start of processing for Convert_To_Positional

   begin
      --  Ada 2005 (AI-287): Do not convert in case of default initialized
      --  components because in this case will need to call the corresponding
      --  IP procedure.

      if Has_Default_Init_Comps (N) then
         return;
      end if;

      if Is_Flat (N, Number_Dimensions (Typ)) then
         return;
      end if;

      if Is_Bit_Packed_Array (Typ)
        and then not Handle_Bit_Packed
      then
         return;
      end if;

      --  Do not convert to positional if controlled components are involved
      --  since these require special processing

      if Has_Controlled_Component (Typ) then
         return;
      end if;

      Check_Static_Components;

      --  If the size is known, or all the components are static, try to
      --  build a fully positional aggregate.

      --  The size of the type  may not be known for an aggregate with
      --  discriminated array components, but if the components are static
      --  it is still possible to verify statically that the length is
      --  compatible with the upper bound of the type, and therefore it is
      --  worth flattening such aggregates as well.

      --  For now the back-end expands these aggregates into individual
      --  assignments to the target anyway, but it is conceivable that
      --  it will eventually be able to treat such aggregates statically???

      if Aggr_Size_OK (N, Typ)
        and then Flatten (N, First_Index (Typ), First_Index (Base_Type (Typ)))
      then
         if Static_Components then
            Set_Compile_Time_Known_Aggregate (N);
            Set_Expansion_Delayed (N, False);
         end if;

         Analyze_And_Resolve (N, Typ);
      end if;
   end Convert_To_Positional;

   ----------------------------
   -- Expand_Array_Aggregate --
   ----------------------------

   --  Array aggregate expansion proceeds as follows:

   --  1. If requested we generate code to perform all the array aggregate
   --     bound checks, specifically

   --         (a) Check that the index range defined by aggregate bounds is
   --             compatible with corresponding index subtype.

   --         (b) If an others choice is present check that no aggregate
   --             index is outside the bounds of the index constraint.

   --         (c) For multidimensional arrays make sure that all subaggregates
   --             corresponding to the same dimension have the same bounds.

   --  2. Check for packed array aggregate which can be converted to a
   --     constant so that the aggregate disappeares completely.

   --  3. Check case of nested aggregate. Generally nested aggregates are
   --     handled during the processing of the parent aggregate.

   --  4. Check if the aggregate can be statically processed. If this is the
   --     case pass it as is to Gigi. Note that a necessary condition for
   --     static processing is that the aggregate be fully positional.

   --  5. If in place aggregate expansion is possible (i.e. no need to create
   --     a temporary) then mark the aggregate as such and return. Otherwise
   --     create a new temporary and generate the appropriate initialization
   --     code.

   procedure Expand_Array_Aggregate (N : Node_Id) is
      Loc : constant Source_Ptr := Sloc (N);

      Typ  : constant Entity_Id := Etype (N);
      Ctyp : constant Entity_Id := Component_Type (Typ);
      --  Typ is the correct constrained array subtype of the aggregate
      --  Ctyp is the corresponding component type.

      Aggr_Dimension : constant Pos := Number_Dimensions (Typ);
      --  Number of aggregate index dimensions

      Aggr_Low  : array (1 .. Aggr_Dimension) of Node_Id;
      Aggr_High : array (1 .. Aggr_Dimension) of Node_Id;
      --  Low and High bounds of the constraint for each aggregate index

      Aggr_Index_Typ : array (1 .. Aggr_Dimension) of Entity_Id;
      --  The type of each index

      Maybe_In_Place_OK : Boolean;
      --  If the type is neither controlled nor packed and the aggregate
      --  is the expression in an assignment, assignment in place may be
      --  possible, provided other conditions are met on the LHS.

      Others_Present : array (1 .. Aggr_Dimension) of Boolean :=
                         (others => False);
      --  If Others_Present (J) is True, then there is an others choice
      --  in one of the sub-aggregates of N at dimension J.

      procedure Build_Constrained_Type (Positional : Boolean);
      --  If the subtype is not static or unconstrained, build a constrained
      --  type using the computable sizes of the aggregate and its sub-
      --  aggregates.

      procedure Check_Bounds (Aggr_Bounds : Node_Id; Index_Bounds : Node_Id);
      --  Checks that the bounds of Aggr_Bounds are within the bounds defined
      --  by Index_Bounds.

      procedure Check_Same_Aggr_Bounds (Sub_Aggr : Node_Id; Dim : Pos);
      --  Checks that in a multi-dimensional array aggregate all subaggregates
      --  corresponding to the same dimension have the same bounds.
      --  Sub_Aggr is an array sub-aggregate. Dim is the dimension
      --  corresponding to the sub-aggregate.

      procedure Compute_Others_Present (Sub_Aggr : Node_Id; Dim : Pos);
      --  Computes the values of array Others_Present. Sub_Aggr is the
      --  array sub-aggregate we start the computation from. Dim is the
      --  dimension corresponding to the sub-aggregate.

      function In_Place_Assign_OK return Boolean;
      --  Simple predicate to determine whether an aggregate assignment can
      --  be done in place, because none of the new values can depend on the
      --  components of the target of the assignment.

      procedure Others_Check (Sub_Aggr : Node_Id; Dim : Pos);
      --  Checks that if an others choice is present in any sub-aggregate no
      --  aggregate index is outside the bounds of the index constraint.
      --  Sub_Aggr is an array sub-aggregate. Dim is the dimension
      --  corresponding to the sub-aggregate.

      function Safe_Left_Hand_Side (N : Node_Id) return Boolean;
      --  In addition to Maybe_In_Place_OK, in order for an aggregate to be
      --  built directly into the target of the assignment it must be free
      --  of side-effects.

      ----------------------------
      -- Build_Constrained_Type --
      ----------------------------

      procedure Build_Constrained_Type (Positional : Boolean) is
         Loc      : constant Source_Ptr := Sloc (N);
         Agg_Type : constant Entity_Id  := Make_Temporary (Loc, 'A');
         Comp     : Node_Id;
         Decl     : Node_Id;
         Typ      : constant Entity_Id := Etype (N);
         Indexes  : constant List_Id   := New_List;
         Num      : Int;
         Sub_Agg  : Node_Id;

      begin
         --  If the aggregate is purely positional, all its subaggregates
         --  have the same size. We collect the dimensions from the first
         --  subaggregate at each level.

         if Positional then
            Sub_Agg := N;

            for D in 1 .. Number_Dimensions (Typ) loop
               Sub_Agg := First (Expressions (Sub_Agg));

               Comp := Sub_Agg;
               Num := 0;
               while Present (Comp) loop
                  Num := Num + 1;
                  Next (Comp);
               end loop;

               Append_To (Indexes,
                 Make_Range (Loc,
                   Low_Bound =>  Make_Integer_Literal (Loc, 1),
                   High_Bound => Make_Integer_Literal (Loc, Num)));
            end loop;

         else
            --  We know the aggregate type is unconstrained and the aggregate
            --  is not processable by the back end, therefore not necessarily
            --  positional. Retrieve each dimension bounds (computed earlier).

            for D in 1 .. Number_Dimensions (Typ) loop
               Append (
                 Make_Range (Loc,
                    Low_Bound  => Aggr_Low  (D),
                    High_Bound => Aggr_High (D)),
                 Indexes);
            end loop;
         end if;

         Decl :=
           Make_Full_Type_Declaration (Loc,
               Defining_Identifier => Agg_Type,
               Type_Definition =>
                 Make_Constrained_Array_Definition (Loc,
                   Discrete_Subtype_Definitions => Indexes,
                   Component_Definition         =>
                     Make_Component_Definition (Loc,
                       Aliased_Present    => False,
                       Subtype_Indication =>
                         New_Occurrence_Of (Component_Type (Typ), Loc))));

         Insert_Action (N, Decl);
         Analyze (Decl);
         Set_Etype (N, Agg_Type);
         Set_Is_Itype (Agg_Type);
         Freeze_Itype (Agg_Type, N);
      end Build_Constrained_Type;

      ------------------
      -- Check_Bounds --
      ------------------

      procedure Check_Bounds (Aggr_Bounds : Node_Id; Index_Bounds : Node_Id) is
         Aggr_Lo : Node_Id;
         Aggr_Hi : Node_Id;

         Ind_Lo  : Node_Id;
         Ind_Hi  : Node_Id;

         Cond    : Node_Id := Empty;

      begin
         Get_Index_Bounds (Aggr_Bounds, Aggr_Lo, Aggr_Hi);
         Get_Index_Bounds (Index_Bounds, Ind_Lo, Ind_Hi);

         --  Generate the following test:
         --
         --    [constraint_error when
         --      Aggr_Lo <= Aggr_Hi and then
         --        (Aggr_Lo < Ind_Lo or else Aggr_Hi > Ind_Hi)]

         --  As an optimization try to see if some tests are trivially vacuous
         --  because we are comparing an expression against itself.

         if Aggr_Lo = Ind_Lo and then Aggr_Hi = Ind_Hi then
            Cond := Empty;

         elsif Aggr_Hi = Ind_Hi then
            Cond :=
              Make_Op_Lt (Loc,
                Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Lo),
                Right_Opnd => Duplicate_Subexpr_Move_Checks (Ind_Lo));

         elsif Aggr_Lo = Ind_Lo then
            Cond :=
              Make_Op_Gt (Loc,
                Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Hi),
                Right_Opnd => Duplicate_Subexpr_Move_Checks (Ind_Hi));

         else
            Cond :=
              Make_Or_Else (Loc,
                Left_Opnd =>
                  Make_Op_Lt (Loc,
                    Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Lo),
                    Right_Opnd => Duplicate_Subexpr_Move_Checks (Ind_Lo)),

                Right_Opnd =>
                  Make_Op_Gt (Loc,
                    Left_Opnd  => Duplicate_Subexpr (Aggr_Hi),
                    Right_Opnd => Duplicate_Subexpr (Ind_Hi)));
         end if;

         if Present (Cond) then
            Cond :=
              Make_And_Then (Loc,
                Left_Opnd =>
                  Make_Op_Le (Loc,
                    Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Lo),
                    Right_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Hi)),

                Right_Opnd => Cond);

            Set_Analyzed (Left_Opnd  (Left_Opnd (Cond)), False);
            Set_Analyzed (Right_Opnd (Left_Opnd (Cond)), False);
            Insert_Action (N,
              Make_Raise_Constraint_Error (Loc,
                Condition => Cond,
                Reason    => CE_Length_Check_Failed));
         end if;
      end Check_Bounds;

      ----------------------------
      -- Check_Same_Aggr_Bounds --
      ----------------------------

      procedure Check_Same_Aggr_Bounds (Sub_Aggr : Node_Id; Dim : Pos) is
         Sub_Lo : constant Node_Id := Low_Bound (Aggregate_Bounds (Sub_Aggr));
         Sub_Hi : constant Node_Id := High_Bound (Aggregate_Bounds (Sub_Aggr));
         --  The bounds of this specific sub-aggregate

         Aggr_Lo : constant Node_Id := Aggr_Low (Dim);
         Aggr_Hi : constant Node_Id := Aggr_High (Dim);
         --  The bounds of the aggregate for this dimension

         Ind_Typ : constant Entity_Id := Aggr_Index_Typ (Dim);
         --  The index type for this dimension.xxx

         Cond  : Node_Id := Empty;
         Assoc : Node_Id;
         Expr  : Node_Id;

      begin
         --  If index checks are on generate the test

         --    [constraint_error when
         --      Aggr_Lo /= Sub_Lo or else Aggr_Hi /= Sub_Hi]

         --  As an optimization try to see if some tests are trivially vacuos
         --  because we are comparing an expression against itself. Also for
         --  the first dimension the test is trivially vacuous because there
         --  is just one aggregate for dimension 1.

         if Index_Checks_Suppressed (Ind_Typ) then
            Cond := Empty;

         elsif Dim = 1
           or else (Aggr_Lo = Sub_Lo and then Aggr_Hi = Sub_Hi)
         then
            Cond := Empty;

         elsif Aggr_Hi = Sub_Hi then
            Cond :=
              Make_Op_Ne (Loc,
                Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Lo),
                Right_Opnd => Duplicate_Subexpr_Move_Checks (Sub_Lo));

         elsif Aggr_Lo = Sub_Lo then
            Cond :=
              Make_Op_Ne (Loc,
                Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Hi),
                Right_Opnd => Duplicate_Subexpr_Move_Checks (Sub_Hi));

         else
            Cond :=
              Make_Or_Else (Loc,
                Left_Opnd =>
                  Make_Op_Ne (Loc,
                    Left_Opnd  => Duplicate_Subexpr_Move_Checks (Aggr_Lo),
                    Right_Opnd => Duplicate_Subexpr_Move_Checks (Sub_Lo)),

                Right_Opnd =>
                  Make_Op_Ne (Loc,
                    Left_Opnd  => Duplicate_Subexpr (Aggr_Hi),
                    Right_Opnd => Duplicate_Subexpr (Sub_Hi)));
         end if;

         if Present (Cond) then
            Insert_Action (N,
              Make_Raise_Constraint_Error (Loc,
                Condition => Cond,
                Reason    => CE_Length_Check_Failed));
         end if;

         --  Now look inside the sub-aggregate to see if there is more work

         if Dim < Aggr_Dimension then

            --  Process positional components

            if Present (Expressions (Sub_Aggr)) then
               Expr := First (Expressions (Sub_Aggr));
               while Present (Expr) loop
                  Check_Same_Aggr_Bounds (Expr, Dim + 1);
                  Next (Expr);
               end loop;
            end if;

            --  Process component associations

            if Present (Component_Associations (Sub_Aggr)) then
               Assoc := First (Component_Associations (Sub_Aggr));
               while Present (Assoc) loop
                  Expr := Expression (Assoc);
                  Check_Same_Aggr_Bounds (Expr, Dim + 1);
                  Next (Assoc);
               end loop;
            end if;
         end if;
      end Check_Same_Aggr_Bounds;

      ----------------------------
      -- Compute_Others_Present --
      ----------------------------

      procedure Compute_Others_Present (Sub_Aggr : Node_Id; Dim : Pos) is
         Assoc : Node_Id;
         Expr  : Node_Id;

      begin
         if Present (Component_Associations (Sub_Aggr)) then
            Assoc := Last (Component_Associations (Sub_Aggr));

            if Nkind (First (Choices (Assoc))) = N_Others_Choice then
               Others_Present (Dim) := True;
            end if;
         end if;

         --  Now look inside the sub-aggregate to see if there is more work

         if Dim < Aggr_Dimension then

            --  Process positional components

            if Present (Expressions (Sub_Aggr)) then
               Expr := First (Expressions (Sub_Aggr));
               while Present (Expr) loop
                  Compute_Others_Present (Expr, Dim + 1);
                  Next (Expr);
               end loop;
            end if;

            --  Process component associations

            if Present (Component_Associations (Sub_Aggr)) then
               Assoc := First (Component_Associations (Sub_Aggr));
               while Present (Assoc) loop
                  Expr := Expression (Assoc);
                  Compute_Others_Present (Expr, Dim + 1);
                  Next (Assoc);
               end loop;
            end if;
         end if;
      end Compute_Others_Present;

      ------------------------
      -- In_Place_Assign_OK --
      ------------------------

      function In_Place_Assign_OK return Boolean is
         Aggr_In : Node_Id;
         Aggr_Lo : Node_Id;
         Aggr_Hi : Node_Id;
         Obj_In  : Node_Id;
         Obj_Lo  : Node_Id;
         Obj_Hi  : Node_Id;

         function Is_Others_Aggregate (Aggr : Node_Id) return Boolean;
         --  Aggregates that consist of a single Others choice are safe
         --  if the single expression is.

         function Safe_Aggregate (Aggr : Node_Id) return Boolean;
         --  Check recursively that each component of a (sub)aggregate does
         --  not depend on the variable being assigned to.

         function Safe_Component (Expr : Node_Id) return Boolean;
         --  Verify that an expression cannot depend on the variable being
         --  assigned to. Room for improvement here (but less than before).

         -------------------------
         -- Is_Others_Aggregate --
         -------------------------

         function Is_Others_Aggregate (Aggr : Node_Id) return Boolean is
         begin
            return No (Expressions (Aggr))
              and then Nkind
                (First (Choices (First (Component_Associations (Aggr)))))
                  = N_Others_Choice;
         end Is_Others_Aggregate;

         --------------------
         -- Safe_Aggregate --
         --------------------

         function Safe_Aggregate (Aggr : Node_Id) return Boolean is
            Expr : Node_Id;

         begin
            if Present (Expressions (Aggr)) then
               Expr := First (Expressions (Aggr));
               while Present (Expr) loop
                  if Nkind (Expr) = N_Aggregate then
                     if not Safe_Aggregate (Expr) then
                        return False;
                     end if;

                  elsif not Safe_Component (Expr) then
                     return False;
                  end if;

                  Next (Expr);
               end loop;
            end if;

            if Present (Component_Associations (Aggr)) then
               Expr := First (Component_Associations (Aggr));
               while Present (Expr) loop
                  if Nkind (Expression (Expr)) = N_Aggregate then
                     if not Safe_Aggregate (Expression (Expr)) then
                        return False;
                     end if;

                  elsif not Safe_Component (Expression (Expr)) then
                     return False;
                  end if;

                  Next (Expr);
               end loop;
            end if;

            return True;
         end Safe_Aggregate;

         --------------------
         -- Safe_Component --
         --------------------

         function Safe_Component (Expr : Node_Id) return Boolean is
            Comp : Node_Id := Expr;

            function Check_Component (Comp : Node_Id) return Boolean;
            --  Do the recursive traversal, after copy

            ---------------------
            -- Check_Component --
            ---------------------

            function Check_Component (Comp : Node_Id) return Boolean is
            begin
               if Is_Overloaded (Comp) then
                  return False;
               end if;

               return Compile_Time_Known_Value (Comp)

                 or else (Is_Entity_Name (Comp)
                           and then  Present (Entity (Comp))
                           and then No (Renamed_Object (Entity (Comp))))

                 or else (Nkind (Comp) = N_Attribute_Reference
                           and then Check_Component (Prefix (Comp)))

                 or else (Nkind (Comp) in N_Binary_Op
                           and then Check_Component (Left_Opnd  (Comp))
                           and then Check_Component (Right_Opnd (Comp)))

                 or else (Nkind (Comp) in N_Unary_Op
                           and then Check_Component (Right_Opnd (Comp)))

                 or else (Nkind (Comp) = N_Selected_Component
                           and then Check_Component (Prefix (Comp)))

                 or else (Nkind (Comp) = N_Unchecked_Type_Conversion
                           and then Check_Component (Expression (Comp)));
            end Check_Component;

         --  Start of processing for Safe_Component

         begin
            --  If the component appears in an association that may
            --  correspond to more than one element, it is not analyzed
            --  before the expansion into assignments, to avoid side effects.
            --  We analyze, but do not resolve the copy, to obtain sufficient
            --  entity information for the checks that follow. If component is
            --  overloaded we assume an unsafe function call.

            if not Analyzed (Comp) then
               if Is_Overloaded (Expr) then
                  return False;

               elsif Nkind (Expr) = N_Aggregate
                  and then not Is_Others_Aggregate (Expr)
               then
                  return False;

               elsif Nkind (Expr) = N_Allocator then

                  --  For now, too complex to analyze

                  return False;
               end if;

               Comp := New_Copy_Tree (Expr);
               Set_Parent (Comp, Parent (Expr));
               Analyze (Comp);
            end if;

            if Nkind (Comp) = N_Aggregate then
               return Safe_Aggregate (Comp);
            else
               return Check_Component (Comp);
            end if;
         end Safe_Component;

      --  Start of processing for In_Place_Assign_OK

      begin
         if Present (Component_Associations (N)) then

            --  On assignment, sliding can take place, so we cannot do the
            --  assignment in place unless the bounds of the aggregate are
            --  statically equal to those of the target.

            --  If the aggregate is given by an others choice, the bounds
            --  are derived from the left-hand side, and the assignment is
            --  safe if the expression is.

            if Is_Others_Aggregate (N) then
               return
                 Safe_Component
                  (Expression (First (Component_Associations (N))));
            end if;

            Aggr_In := First_Index (Etype (N));

            if Nkind (Parent (N)) = N_Assignment_Statement then
               Obj_In  := First_Index (Etype (Name (Parent (N))));

            else
               --  Context is an allocator. Check bounds of aggregate
               --  against given type in qualified expression.

               pragma Assert (Nkind (Parent (Parent (N))) = N_Allocator);
               Obj_In :=
                 First_Index (Etype (Entity (Subtype_Mark (Parent (N)))));
            end if;

            while Present (Aggr_In) loop
               Get_Index_Bounds (Aggr_In, Aggr_Lo, Aggr_Hi);
               Get_Index_Bounds (Obj_In, Obj_Lo, Obj_Hi);

               if not Compile_Time_Known_Value (Aggr_Lo)
                 or else not Compile_Time_Known_Value (Aggr_Hi)
                 or else not Compile_Time_Known_Value (Obj_Lo)
                 or else not Compile_Time_Known_Value (Obj_Hi)
                 or else Expr_Value (Aggr_Lo) /= Expr_Value (Obj_Lo)
                 or else Expr_Value (Aggr_Hi) /= Expr_Value (Obj_Hi)
               then
                  return False;
               end if;

               Next_Index (Aggr_In);
               Next_Index (Obj_In);
            end loop;
         end if;

         --  Now check the component values themselves

         return Safe_Aggregate (N);
      end In_Place_Assign_OK;

      ------------------
      -- Others_Check --
      ------------------

      procedure Others_Check (Sub_Aggr : Node_Id; Dim : Pos) is
         Aggr_Lo : constant Node_Id := Aggr_Low (Dim);
         Aggr_Hi : constant Node_Id := Aggr_High (Dim);
         --  The bounds of the aggregate for this dimension

         Ind_Typ : constant Entity_Id := Aggr_Index_Typ (Dim);
         --  The index type for this dimension

         Need_To_Check : Boolean := False;

         Choices_Lo : Node_Id := Empty;
         Choices_Hi : Node_Id := Empty;
         --  The lowest and highest discrete choices for a named sub-aggregate

         Nb_Choices : Int := -1;
         --  The number of discrete non-others choices in this sub-aggregate

         Nb_Elements : Uint := Uint_0;
         --  The number of elements in a positional aggregate

         Cond : Node_Id := Empty;

         Assoc  : Node_Id;
         Choice : Node_Id;
         Expr   : Node_Id;

      begin
         --  Check if we have an others choice. If we do make sure that this
         --  sub-aggregate contains at least one element in addition to the
         --  others choice.

         if Range_Checks_Suppressed (Ind_Typ) then
            Need_To_Check := False;

         elsif Present (Expressions (Sub_Aggr))
           and then Present (Component_Associations (Sub_Aggr))
         then
            Need_To_Check := True;

         elsif Present (Component_Associations (Sub_Aggr)) then
            Assoc := Last (Component_Associations (Sub_Aggr));

            if Nkind (First (Choices (Assoc))) /= N_Others_Choice then
               Need_To_Check := False;

            else
               --  Count the number of discrete choices. Start with -1 because
               --  the others choice does not count.

               Nb_Choices := -1;
               Assoc := First (Component_Associations (Sub_Aggr));
               while Present (Assoc) loop
                  Choice := First (Choices (Assoc));
                  while Present (Choice) loop
                     Nb_Choices := Nb_Choices + 1;
                     Next (Choice);
                  end loop;

                  Next (Assoc);
               end loop;

               --  If there is only an others choice nothing to do

               Need_To_Check := (Nb_Choices > 0);
            end if;

         else
            Need_To_Check := False;
         end if;

         --  If we are dealing with a positional sub-aggregate with an others
         --  choice then compute the number or positional elements.

         if Need_To_Check and then Present (Expressions (Sub_Aggr)) then
            Expr := First (Expressions (Sub_Aggr));
            Nb_Elements := Uint_0;
            while Present (Expr) loop
               Nb_Elements := Nb_Elements + 1;
               Next (Expr);
            end loop;

         --  If the aggregate contains discrete choices and an others choice
         --  compute the smallest and largest discrete choice values.

         elsif Need_To_Check then
            Compute_Choices_Lo_And_Choices_Hi : declare

               Table : Case_Table_Type (1 .. Nb_Choices);
               --  Used to sort all the different choice values

               J    : Pos := 1;
               Low  : Node_Id;
               High : Node_Id;

            begin
               Assoc := First (Component_Associations (Sub_Aggr));
               while Present (Assoc) loop
                  Choice := First (Choices (Assoc));
                  while Present (Choice) loop
                     if Nkind (Choice) = N_Others_Choice then
                        exit;
                     end if;

                     Get_Index_Bounds (Choice, Low, High);
                     Table (J).Choice_Lo := Low;
                     Table (J).Choice_Hi := High;

                     J := J + 1;
                     Next (Choice);
                  end loop;

                  Next (Assoc);
               end loop;

               --  Sort the discrete choices

               Sort_Case_Table (Table);

               Choices_Lo := Table (1).Choice_Lo;
               Choices_Hi := Table (Nb_Choices).Choice_Hi;
            end Compute_Choices_Lo_And_Choices_Hi;
         end if;

         --  If no others choice in this sub-aggregate, or the aggregate
         --  comprises only an others choice, nothing to do.

         if not Need_To_Check then
            Cond := Empty;

         --  If we are dealing with an aggregate containing an others choice
         --  and positional components, we generate the following test:

         --    if Ind_Typ'Pos (Aggr_Lo) + (Nb_Elements - 1) >
         --            Ind_Typ'Pos (Aggr_Hi)
         --    then
         --       raise Constraint_Error;
         --    end if;

         elsif Nb_Elements > Uint_0 then
            Cond :=
              Make_Op_Gt (Loc,
                Left_Opnd  =>
                  Make_Op_Add (Loc,
                    Left_Opnd  =>
                      Make_Attribute_Reference (Loc,
                        Prefix         => New_Reference_To (Ind_Typ, Loc),
                        Attribute_Name => Name_Pos,
                        Expressions    =>
                          New_List
                            (Duplicate_Subexpr_Move_Checks (Aggr_Lo))),
                    Right_Opnd => Make_Integer_Literal (Loc, Nb_Elements - 1)),

                Right_Opnd =>
                  Make_Attribute_Reference (Loc,
                    Prefix         => New_Reference_To (Ind_Typ, Loc),
                    Attribute_Name => Name_Pos,
                    Expressions    => New_List (
                      Duplicate_Subexpr_Move_Checks (Aggr_Hi))));

         --  If we are dealing with an aggregate containing an others choice
         --  and discrete choices we generate the following test:

         --    [constraint_error when
         --      Choices_Lo < Aggr_Lo or else Choices_Hi > Aggr_Hi];

         else
            Cond :=
              Make_Or_Else (Loc,
                Left_Opnd =>
                  Make_Op_Lt (Loc,
                    Left_Opnd  =>
                      Duplicate_Subexpr_Move_Checks (Choices_Lo),
                    Right_Opnd =>
                      Duplicate_Subexpr_Move_Checks (Aggr_Lo)),

                Right_Opnd =>
                  Make_Op_Gt (Loc,
                    Left_Opnd  =>
                      Duplicate_Subexpr (Choices_Hi),
                    Right_Opnd =>
                      Duplicate_Subexpr (Aggr_Hi)));
         end if;

         if Present (Cond) then
            Insert_Action (N,
              Make_Raise_Constraint_Error (Loc,
                Condition => Cond,
                Reason    => CE_Length_Check_Failed));
            --  Questionable reason code, shouldn't that be a
            --  CE_Range_Check_Failed ???
         end if;

         --  Now look inside the sub-aggregate to see if there is more work

         if Dim < Aggr_Dimension then

            --  Process positional components

            if Present (Expressions (Sub_Aggr)) then
               Expr := First (Expressions (Sub_Aggr));
               while Present (Expr) loop
                  Others_Check (Expr, Dim + 1);
                  Next (Expr);
               end loop;
            end if;

            --  Process component associations

            if Present (Component_Associations (Sub_Aggr)) then
               Assoc := First (Component_Associations (Sub_Aggr));
               while Present (Assoc) loop
                  Expr := Expression (Assoc);
                  Others_Check (Expr, Dim + 1);
                  Next (Assoc);
               end loop;
            end if;
         end if;
      end Others_Check;

      -------------------------
      -- Safe_Left_Hand_Side --
      -------------------------

      function Safe_Left_Hand_Side (N : Node_Id) return Boolean is
         function Is_Safe_Index (Indx : Node_Id) return Boolean;
         --  If the left-hand side includes an indexed component, check that
         --  the indexes are free of side-effect.

         -------------------
         -- Is_Safe_Index --
         -------------------

         function Is_Safe_Index (Indx : Node_Id) return Boolean is
         begin
            if Is_Entity_Name (Indx) then
               return True;

            elsif Nkind (Indx) = N_Integer_Literal then
               return True;

            elsif Nkind (Indx) = N_Function_Call
              and then Is_Entity_Name (Name (Indx))
              and then
                Has_Pragma_Pure_Function (Entity (Name (Indx)))
            then
               return True;

            elsif Nkind (Indx) = N_Type_Conversion
              and then Is_Safe_Index (Expression (Indx))
            then
               return True;

            else
               return False;
            end if;
         end Is_Safe_Index;

      --  Start of processing for Safe_Left_Hand_Side

      begin
         if Is_Entity_Name (N) then
            return True;

         elsif Nkind_In (N, N_Explicit_Dereference, N_Selected_Component)
           and then Safe_Left_Hand_Side (Prefix (N))
         then
            return True;

         elsif Nkind (N) = N_Indexed_Component
           and then Safe_Left_Hand_Side (Prefix (N))
           and then
             Is_Safe_Index (First (Expressions (N)))
         then
            return True;

         elsif Nkind (N) = N_Unchecked_Type_Conversion then
            return Safe_Left_Hand_Side (Expression (N));

         else
            return False;
         end if;
      end Safe_Left_Hand_Side;

      --  Local variables

      Tmp : Entity_Id;
      --  Holds the temporary aggregate value

      Tmp_Decl : Node_Id;
      --  Holds the declaration of Tmp

      Aggr_Code   : List_Id;
      Parent_Node : Node_Id;
      Parent_Kind : Node_Kind;

   --  Start of processing for Expand_Array_Aggregate

   begin
      --  Do not touch the special aggregates of attributes used for Asm calls

      if Is_RTE (Ctyp, RE_Asm_Input_Operand)
        or else Is_RTE (Ctyp, RE_Asm_Output_Operand)
      then
         return;
      end if;

      --  If the semantic analyzer has determined that aggregate N will raise
      --  Constraint_Error at run time, then the aggregate node has been
      --  replaced with an N_Raise_Constraint_Error node and we should
      --  never get here.

      pragma Assert (not Raises_Constraint_Error (N));

      --  STEP 1a

      --  Check that the index range defined by aggregate bounds is
      --  compatible with corresponding index subtype.

      Index_Compatibility_Check : declare
         Aggr_Index_Range : Node_Id := First_Index (Typ);
         --  The current aggregate index range

         Index_Constraint : Node_Id := First_Index (Etype (Typ));
         --  The corresponding index constraint against which we have to
         --  check the above aggregate index range.

      begin
         Compute_Others_Present (N, 1);

         for J in 1 .. Aggr_Dimension loop
            --  There is no need to emit a check if an others choice is
            --  present for this array aggregate dimension since in this
            --  case one of N's sub-aggregates has taken its bounds from the
            --  context and these bounds must have been checked already. In
            --  addition all sub-aggregates corresponding to the same
            --  dimension must all have the same bounds (checked in (c) below).

            if not Range_Checks_Suppressed (Etype (Index_Constraint))
              and then not Others_Present (J)
            then
               --  We don't use Checks.Apply_Range_Check here because it emits
               --  a spurious check. Namely it checks that the range defined by
               --  the aggregate bounds is non empty. But we know this already
               --  if we get here.

               Check_Bounds (Aggr_Index_Range, Index_Constraint);
            end if;

            --  Save the low and high bounds of the aggregate index as well as
            --  the index type for later use in checks (b) and (c) below.

            Aggr_Low  (J) := Low_Bound (Aggr_Index_Range);
            Aggr_High (J) := High_Bound (Aggr_Index_Range);

            Aggr_Index_Typ (J) := Etype (Index_Constraint);

            Next_Index (Aggr_Index_Range);
            Next_Index (Index_Constraint);
         end loop;
      end Index_Compatibility_Check;

      --  STEP 1b

      --  If an others choice is present check that no aggregate index is
      --  outside the bounds of the index constraint.

      Others_Check (N, 1);

      --  STEP 1c

      --  For multidimensional arrays make sure that all subaggregates
      --  corresponding to the same dimension have the same bounds.

      if Aggr_Dimension > 1 then
         Check_Same_Aggr_Bounds (N, 1);
      end if;

      --  STEP 2

      --  Here we test for is packed array aggregate that we can handle at
      --  compile time. If so, return with transformation done. Note that we do
      --  this even if the aggregate is nested, because once we have done this
      --  processing, there is no more nested aggregate!

      if Packed_Array_Aggregate_Handled (N) then
         return;
      end if;

      --  At this point we try to convert to positional form

      if Ekind (Current_Scope) = E_Package
        and then Static_Elaboration_Desired (Current_Scope)
      then
         Convert_To_Positional (N, Max_Others_Replicate => 100);

      else
         Convert_To_Positional (N);
      end if;

      --  if the result is no longer an aggregate (e.g. it may be a string
      --  literal, or a temporary which has the needed value), then we are
      --  done, since there is no longer a nested aggregate.

      if Nkind (N) /= N_Aggregate then
         return;

      --  We are also done if the result is an analyzed aggregate
      --  This case could use more comments ???

      elsif Analyzed (N)
        and then N /= Original_Node (N)
      then
         return;
      end if;

      --  If all aggregate components are compile-time known and the aggregate
      --  has been flattened, nothing left to do. The same occurs if the
      --  aggregate is used to initialize the components of an statically
      --  allocated dispatch table.

      if Compile_Time_Known_Aggregate (N)
        or else Is_Static_Dispatch_Table_Aggregate (N)
      then
         Set_Expansion_Delayed (N, False);
         return;
      end if;

      --  Now see if back end processing is possible

      if Backend_Processing_Possible (N) then

         --  If the aggregate is static but the constraints are not, build
         --  a static subtype for the aggregate, so that Gigi can place it
         --  in static memory. Perform an unchecked_conversion to the non-
         --  static type imposed by the context.

         declare
            Itype      : constant Entity_Id := Etype (N);
            Index      : Node_Id;
            Needs_Type : Boolean := False;

         begin
            Index := First_Index (Itype);
            while Present (Index) loop
               if not Is_Static_Subtype (Etype (Index)) then
                  Needs_Type := True;
                  exit;
               else
                  Next_Index (Index);
               end if;
            end loop;

            if Needs_Type then
               Build_Constrained_Type (Positional => True);
               Rewrite (N, Unchecked_Convert_To (Itype, N));
               Analyze (N);
            end if;
         end;

         return;
      end if;

      --  STEP 3

      --  Delay expansion for nested aggregates: it will be taken care of
      --  when the parent aggregate is expanded.

      Parent_Node := Parent (N);
      Parent_Kind := Nkind (Parent_Node);

      if Parent_Kind = N_Qualified_Expression then
         Parent_Node := Parent (Parent_Node);
         Parent_Kind := Nkind (Parent_Node);
      end if;

      if Parent_Kind = N_Aggregate
        or else Parent_Kind = N_Extension_Aggregate
        or else Parent_Kind = N_Component_Association
        or else (Parent_Kind = N_Object_Declaration
                  and then Needs_Finalization (Typ))
        or else (Parent_Kind = N_Assignment_Statement
                  and then Inside_Init_Proc)
      then
         if Static_Array_Aggregate (N)
           or else Compile_Time_Known_Aggregate (N)
         then
            Set_Expansion_Delayed (N, False);
            return;
         else
            Set_Expansion_Delayed (N);
            return;
         end if;
      end if;

      --  STEP 4

      --  Look if in place aggregate expansion is possible

      --  For object declarations we build the aggregate in place, unless
      --  the array is bit-packed or the component is controlled.

      --  For assignments we do the assignment in place if all the component
      --  associations have compile-time known values. For other cases we
      --  create a temporary. The analysis for safety of on-line assignment
      --  is delicate, i.e. we don't know how to do it fully yet ???

      --  For allocators we assign to the designated object in place if the
      --  aggregate meets the same conditions as other in-place assignments.
      --  In this case the aggregate may not come from source but was created
      --  for default initialization, e.g. with Initialize_Scalars.

      if Requires_Transient_Scope (Typ) then
         Establish_Transient_Scope
           (N, Sec_Stack => Has_Controlled_Component (Typ));
      end if;

      if Has_Default_Init_Comps (N) then
         Maybe_In_Place_OK := False;

      elsif Is_Bit_Packed_Array (Typ)
        or else Has_Controlled_Component (Typ)
      then
         Maybe_In_Place_OK := False;

      else
         Maybe_In_Place_OK :=
          (Nkind (Parent (N)) = N_Assignment_Statement
            and then Comes_From_Source (N)
            and then In_Place_Assign_OK)

          or else
            (Nkind (Parent (Parent (N))) = N_Allocator
              and then In_Place_Assign_OK);
      end if;

      --  If this is an array of tasks, it will be expanded into build-in-place
      --  assignments. Build an activation chain for the tasks now.

      if Has_Task (Etype (N)) then
         Build_Activation_Chain_Entity (N);
      end if;

      --  Should document these individual tests ???

      if not Has_Default_Init_Comps (N)
         and then Comes_From_Source (Parent (N))
         and then Nkind (Parent (N)) = N_Object_Declaration
         and then not
           Must_Slide (Etype (Defining_Identifier (Parent (N))), Typ)
         and then N = Expression (Parent (N))
         and then not Is_Bit_Packed_Array (Typ)
         and then not Has_Controlled_Component (Typ)

      --  If the aggregate is the expression in an object declaration, it
      --  cannot be expanded in place. Lookahead in the current declarative
      --  part to find an address clause for the object being declared. If
      --  one is present, we cannot build in place. Unclear comment???

         and then not Has_Following_Address_Clause (Parent (N))
      then
         Tmp := Defining_Identifier (Parent (N));
         Set_No_Initialization (Parent (N));
         Set_Expression (Parent (N), Empty);

         --  Set the type of the entity, for use in the analysis of the
         --  subsequent indexed assignments. If the nominal type is not
         --  constrained, build a subtype from the known bounds of the
         --  aggregate. If the declaration has a subtype mark, use it,
         --  otherwise use the itype of the aggregate.

         if not Is_Constrained (Typ) then
            Build_Constrained_Type (Positional => False);
         elsif Is_Entity_Name (Object_Definition (Parent (N)))
           and then Is_Constrained (Entity (Object_Definition (Parent (N))))
         then
            Set_Etype (Tmp, Entity (Object_Definition (Parent (N))));
         else
            Set_Size_Known_At_Compile_Time (Typ, False);
            Set_Etype (Tmp, Typ);
         end if;

      elsif Maybe_In_Place_OK
        and then Nkind (Parent (N)) = N_Qualified_Expression
        and then Nkind (Parent (Parent (N))) = N_Allocator
      then
         Set_Expansion_Delayed (N);
         return;

      --  In the remaining cases the aggregate is the RHS of an assignment

      elsif Maybe_In_Place_OK
        and then Safe_Left_Hand_Side (Name (Parent (N)))
      then
         Tmp := Name (Parent (N));

         if Etype (Tmp) /= Etype (N) then
            Apply_Length_Check (N, Etype (Tmp));

            if Nkind (N) = N_Raise_Constraint_Error then

               --  Static error, nothing further to expand

               return;
            end if;
         end if;

      elsif Maybe_In_Place_OK
        and then Nkind (Name (Parent (N))) = N_Slice
        and then Safe_Slice_Assignment (N)
      then
         --  Safe_Slice_Assignment rewrites assignment as a loop

         return;

      --  Step 5

      --  In place aggregate expansion is not possible

      else
         Maybe_In_Place_OK := False;
         Tmp := Make_Temporary (Loc, 'A', N);
         Tmp_Decl :=
           Make_Object_Declaration
             (Loc,
              Defining_Identifier => Tmp,
              Object_Definition   => New_Occurrence_Of (Typ, Loc));
         Set_No_Initialization (Tmp_Decl, True);

         --  If we are within a loop, the temporary will be pushed on the
         --  stack at each iteration. If the aggregate is the expression for an
         --  allocator, it will be immediately copied to the heap and can
         --  be reclaimed at once. We create a transient scope around the
         --  aggregate for this purpose.

         if Ekind (Current_Scope) = E_Loop
           and then Nkind (Parent (Parent (N))) = N_Allocator
         then
            Establish_Transient_Scope (N, False);
         end if;

         Insert_Action (N, Tmp_Decl);
      end if;

      --  Construct and insert the aggregate code. We can safely suppress index
      --  checks because this code is guaranteed not to raise CE on index
      --  checks. However we should *not* suppress all checks.

      declare
         Target : Node_Id;

      begin
         if Nkind (Tmp) = N_Defining_Identifier then
            Target := New_Reference_To (Tmp, Loc);

         else

            if Has_Default_Init_Comps (N) then

               --  Ada 2005 (AI-287): This case has not been analyzed???

               raise Program_Error;
            end if;

            --  Name in assignment is explicit dereference

            Target := New_Copy (Tmp);
         end if;

         Aggr_Code :=
           Build_Array_Aggr_Code (N,
             Ctype       => Ctyp,
             Index       => First_Index (Typ),
             Into        => Target,
             Scalar_Comp => Is_Scalar_Type (Ctyp));
      end;

      if Comes_From_Source (Tmp) then
         Insert_Actions_After (Parent (N), Aggr_Code);

      else
         Insert_Actions (N, Aggr_Code);
      end if;

      --  If the aggregate has been assigned in place, remove the original
      --  assignment.

      if Nkind (Parent (N)) = N_Assignment_Statement
        and then Maybe_In_Place_OK
      then
         Rewrite (Parent (N), Make_Null_Statement (Loc));

      elsif Nkind (Parent (N)) /= N_Object_Declaration
        or else Tmp /= Defining_Identifier (Parent (N))
      then
         Rewrite (N, New_Occurrence_Of (Tmp, Loc));
         Analyze_And_Resolve (N, Typ);
      end if;
   end Expand_Array_Aggregate;

   ------------------------
   -- Expand_N_Aggregate --
   ------------------------

   procedure Expand_N_Aggregate (N : Node_Id) is
   begin
      if Is_Record_Type (Etype (N)) then
         Expand_Record_Aggregate (N);
      else
         Expand_Array_Aggregate (N);
      end if;
   exception
      when RE_Not_Available =>
         return;
   end Expand_N_Aggregate;

   ----------------------------------
   -- Expand_N_Extension_Aggregate --
   ----------------------------------

   --  If the ancestor part is an expression, add a component association for
   --  the parent field. If the type of the ancestor part is not the direct
   --  parent of the expected type,  build recursively the needed ancestors.
   --  If the ancestor part is a subtype_mark, replace aggregate with a decla-
   --  ration for a temporary of the expected type, followed by individual
   --  assignments to the given components.

   procedure Expand_N_Extension_Aggregate (N : Node_Id) is
      Loc : constant Source_Ptr := Sloc  (N);
      A   : constant Node_Id    := Ancestor_Part (N);
      Typ : constant Entity_Id  := Etype (N);

   begin
      --  If the ancestor is a subtype mark, an init proc must be called
      --  on the resulting object which thus has to be materialized in
      --  the front-end

      if Is_Entity_Name (A) and then Is_Type (Entity (A)) then
         Convert_To_Assignments (N, Typ);

      --  The extension aggregate is transformed into a record aggregate
      --  of the following form (c1 and c2 are inherited components)

      --   (Exp with c3 => a, c4 => b)
      --      ==> (c1 => Exp.c1, c2 => Exp.c2, c3 => a, c4 => b)

      else
         Set_Etype (N, Typ);

         if Tagged_Type_Expansion then
            Expand_Record_Aggregate (N,
              Orig_Tag    =>
                New_Occurrence_Of
                  (Node (First_Elmt (Access_Disp_Table (Typ))), Loc),
              Parent_Expr => A);
         else
            --  No tag is needed in the case of a VM
            Expand_Record_Aggregate (N,
              Parent_Expr => A);
         end if;
      end if;

   exception
      when RE_Not_Available =>
         return;
   end Expand_N_Extension_Aggregate;

   -----------------------------
   -- Expand_Record_Aggregate --
   -----------------------------

   procedure Expand_Record_Aggregate
     (N           : Node_Id;
      Orig_Tag    : Node_Id := Empty;
      Parent_Expr : Node_Id := Empty)
   is
      Loc      : constant Source_Ptr := Sloc  (N);
      Comps    : constant List_Id    := Component_Associations (N);
      Typ      : constant Entity_Id  := Etype (N);
      Base_Typ : constant Entity_Id  := Base_Type (Typ);

      Static_Components : Boolean := True;
      --  Flag to indicate whether all components are compile-time known,
      --  and the aggregate can be constructed statically and handled by
      --  the back-end.

      function Component_Not_OK_For_Backend return Boolean;
      --  Check for presence of component which makes it impossible for the
      --  backend to process the aggregate, thus requiring the use of a series
      --  of assignment statements. Cases checked for are a nested aggregate
      --  needing Late_Expansion, the presence of a tagged component which may
      --  need tag adjustment, and a bit unaligned component reference.
      --
      --  We also force expansion into assignments if a component is of a
      --  mutable type (including a private type with discriminants) because
      --  in that case the size of the component to be copied may be smaller
      --  than the side of the target, and there is no simple way for gigi
      --  to compute the size of the object to be copied.
      --
      --  NOTE: This is part of the ongoing work to define precisely the
      --  interface between front-end and back-end handling of aggregates.
      --  In general it is desirable to pass aggregates as they are to gigi,
      --  in order to minimize elaboration code. This is one case where the
      --  semantics of Ada complicate the analysis and lead to anomalies in
      --  the gcc back-end if the aggregate is not expanded into assignments.

      ----------------------------------
      -- Component_Not_OK_For_Backend --
      ----------------------------------

      function Component_Not_OK_For_Backend return Boolean is
         C      : Node_Id;
         Expr_Q : Node_Id;

      begin
         if No (Comps) then
            return False;
         end if;

         C := First (Comps);
         while Present (C) loop

            --  If the component has box initialization, expansion is needed
            --  and component is not ready for backend.

            if Box_Present (C) then
               return True;
            end if;

            if Nkind (Expression (C)) = N_Qualified_Expression then
               Expr_Q := Expression (Expression (C));
            else
               Expr_Q := Expression (C);
            end if;

            --  Return true if the aggregate has any associations for tagged
            --  components that may require tag adjustment.

            --  These are cases where the source expression may have a tag that
            --  could differ from the component tag (e.g., can occur for type
            --  conversions and formal parameters). (Tag adjustment not needed
            --  if VM_Target because object tags are implicit in the machine.)

            if Is_Tagged_Type (Etype (Expr_Q))
              and then (Nkind (Expr_Q) = N_Type_Conversion
                         or else (Is_Entity_Name (Expr_Q)
                                    and then
                                      Ekind (Entity (Expr_Q)) in Formal_Kind))
              and then Tagged_Type_Expansion
            then
               Static_Components := False;
               return True;

            elsif Is_Delayed_Aggregate (Expr_Q) then
               Static_Components := False;
               return True;

            elsif Possible_Bit_Aligned_Component (Expr_Q) then
               Static_Components := False;
               return True;
            end if;

            if Is_Scalar_Type (Etype (Expr_Q)) then
               if not Compile_Time_Known_Value (Expr_Q) then
                  Static_Components := False;
               end if;

            elsif Nkind (Expr_Q) /= N_Aggregate
              or else not Compile_Time_Known_Aggregate (Expr_Q)
            then
               Static_Components := False;

               if Is_Private_Type (Etype (Expr_Q))
                 and then Has_Discriminants (Etype (Expr_Q))
               then
                  return True;
               end if;
            end if;

            Next (C);
         end loop;

         return False;
      end Component_Not_OK_For_Backend;

      --  Remaining Expand_Record_Aggregate variables

      Tag_Value : Node_Id;
      Comp      : Entity_Id;
      New_Comp  : Node_Id;

   --  Start of processing for Expand_Record_Aggregate

   begin
      --  If the aggregate is to be assigned to an atomic variable, we
      --  have to prevent a piecemeal assignment even if the aggregate
      --  is to be expanded. We create a temporary for the aggregate, and
      --  assign the temporary instead, so that the back end can generate
      --  an atomic move for it.

      if Is_Atomic (Typ)
        and then Comes_From_Source (Parent (N))
        and then Is_Atomic_Aggregate (N, Typ)
      then
         return;

      --  No special management required for aggregates used to initialize
      --  statically allocated dispatch tables

      elsif Is_Static_Dispatch_Table_Aggregate (N) then
         return;
      end if;

      --  Ada 2005 (AI-318-2): We need to convert to assignments if components
      --  are build-in-place function calls. The assignments will each turn
      --  into a build-in-place function call.  If components are all static,
      --  we can pass the aggregate to the backend regardless of limitedness.

      --  Extension aggregates, aggregates in extended return statements, and
      --  aggregates for C++ imported types must be expanded.

      if Ada_Version >= Ada_2005 and then Is_Immutably_Limited_Type (Typ) then
         if not Nkind_In (Parent (N), N_Object_Declaration,
                                      N_Component_Association)
         then
            Convert_To_Assignments (N, Typ);

         elsif Nkind (N) = N_Extension_Aggregate
           or else Convention (Typ) = Convention_CPP
         then
            Convert_To_Assignments (N, Typ);

         elsif not Size_Known_At_Compile_Time (Typ)
           or else Component_Not_OK_For_Backend
           or else not Static_Components
         then
            Convert_To_Assignments (N, Typ);

         else
            Set_Compile_Time_Known_Aggregate (N);
            Set_Expansion_Delayed (N, False);
         end if;

      --  Gigi doesn't handle properly temporaries of variable size
      --  so we generate it in the front-end

      elsif not Size_Known_At_Compile_Time (Typ) then
         Convert_To_Assignments (N, Typ);

      --  Temporaries for controlled aggregates need to be attached to a
      --  final chain in order to be properly finalized, so it has to
      --  be created in the front-end

      elsif Is_Controlled (Typ)
        or else Has_Controlled_Component (Base_Type (Typ))
      then
         Convert_To_Assignments (N, Typ);

         --  Ada 2005 (AI-287): In case of default initialized components we
         --  convert the aggregate into assignments.

      elsif Has_Default_Init_Comps (N) then
         Convert_To_Assignments (N, Typ);

      --  Check components

      elsif Component_Not_OK_For_Backend then
         Convert_To_Assignments (N, Typ);

      --  If an ancestor is private, some components are not inherited and
      --  we cannot expand into a record aggregate

      elsif Has_Private_Ancestor (Typ) then
         Convert_To_Assignments (N, Typ);

      --  ??? The following was done to compile fxacc00.ads in the ACVCs. Gigi
      --  is not able to handle the aggregate for Late_Request.

      elsif Is_Tagged_Type (Typ) and then Has_Discriminants (Typ) then
         Convert_To_Assignments (N, Typ);

      --  If the tagged types covers interface types we need to initialize all
      --  hidden components containing pointers to secondary dispatch tables.

      elsif Is_Tagged_Type (Typ) and then Has_Interfaces (Typ) then
         Convert_To_Assignments (N, Typ);

      --  If some components are mutable, the size of the aggregate component
      --  may be distinct from the default size of the type component, so
      --  we need to expand to insure that the back-end copies the proper
      --  size of the data.

      elsif Has_Mutable_Components (Typ) then
         Convert_To_Assignments (N, Typ);

      --  If the type involved has any non-bit aligned components, then we are
      --  not sure that the back end can handle this case correctly.

      elsif Type_May_Have_Bit_Aligned_Components (Typ) then
         Convert_To_Assignments (N, Typ);

      --  In all other cases, build a proper aggregate handlable by gigi

      else
         if Nkind (N) = N_Aggregate then

            --  If the aggregate is static and can be handled by the back-end,
            --  nothing left to do.

            if Static_Components then
               Set_Compile_Time_Known_Aggregate (N);
               Set_Expansion_Delayed (N, False);
            end if;
         end if;

         --  If no discriminants, nothing special to do

         if not Has_Discriminants (Typ) then
            null;

         --  Case of discriminants present

         elsif Is_Derived_Type (Typ) then

            --  For untagged types,  non-stored discriminants are replaced
            --  with stored discriminants, which are the ones that gigi uses
            --  to describe the type and its components.

            Generate_Aggregate_For_Derived_Type : declare
               Constraints  : constant List_Id := New_List;
               First_Comp   : Node_Id;
               Discriminant : Entity_Id;
               Decl         : Node_Id;
               Num_Disc     : Int := 0;
               Num_Gird     : Int := 0;

               procedure Prepend_Stored_Values (T : Entity_Id);
               --  Scan the list of stored discriminants of the type, and add
               --  their values to the aggregate being built.

               ---------------------------
               -- Prepend_Stored_Values --
               ---------------------------

               procedure Prepend_Stored_Values (T : Entity_Id) is
               begin
                  Discriminant := First_Stored_Discriminant (T);
                  while Present (Discriminant) loop
                     New_Comp :=
                       Make_Component_Association (Loc,
                         Choices    =>
                           New_List (New_Occurrence_Of (Discriminant, Loc)),

                         Expression =>
                           New_Copy_Tree (
                             Get_Discriminant_Value (
                                 Discriminant,
                                 Typ,
                                 Discriminant_Constraint (Typ))));

                     if No (First_Comp) then
                        Prepend_To (Component_Associations (N), New_Comp);
                     else
                        Insert_After (First_Comp, New_Comp);
                     end if;

                     First_Comp := New_Comp;
                     Next_Stored_Discriminant (Discriminant);
                  end loop;
               end Prepend_Stored_Values;

            --  Start of processing for Generate_Aggregate_For_Derived_Type

            begin
               --  Remove the associations for the discriminant of derived type

               First_Comp := First (Component_Associations (N));
               while Present (First_Comp) loop
                  Comp := First_Comp;
                  Next (First_Comp);

                  if Ekind (Entity
                             (First (Choices (Comp)))) = E_Discriminant
                  then
                     Remove (Comp);
                     Num_Disc := Num_Disc + 1;
                  end if;
               end loop;

               --  Insert stored discriminant associations in the correct
               --  order. If there are more stored discriminants than new
               --  discriminants, there is at least one new discriminant that
               --  constrains more than one of the stored discriminants. In
               --  this case we need to construct a proper subtype of the
               --  parent type, in order to supply values to all the
               --  components. Otherwise there is one-one correspondence
               --  between the constraints and the stored discriminants.

               First_Comp := Empty;

               Discriminant := First_Stored_Discriminant (Base_Type (Typ));
               while Present (Discriminant) loop
                  Num_Gird := Num_Gird + 1;
                  Next_Stored_Discriminant (Discriminant);
               end loop;

               --  Case of more stored discriminants than new discriminants

               if Num_Gird > Num_Disc then

                  --  Create a proper subtype of the parent type, which is the
                  --  proper implementation type for the aggregate, and convert
                  --  it to the intended target type.

                  Discriminant := First_Stored_Discriminant (Base_Type (Typ));
                  while Present (Discriminant) loop
                     New_Comp :=
                       New_Copy_Tree (
                         Get_Discriminant_Value (
                             Discriminant,
                             Typ,
                             Discriminant_Constraint (Typ)));
                     Append (New_Comp, Constraints);
                     Next_Stored_Discriminant (Discriminant);
                  end loop;

                  Decl :=
                    Make_Subtype_Declaration (Loc,
                      Defining_Identifier => Make_Temporary (Loc, 'T'),
                      Subtype_Indication =>
                        Make_Subtype_Indication (Loc,
                          Subtype_Mark =>
                            New_Occurrence_Of (Etype (Base_Type (Typ)), Loc),
                          Constraint =>
                            Make_Index_Or_Discriminant_Constraint
                              (Loc, Constraints)));

                  Insert_Action (N, Decl);
                  Prepend_Stored_Values (Base_Type (Typ));

                  Set_Etype (N, Defining_Identifier (Decl));
                  Set_Analyzed (N);

                  Rewrite (N, Unchecked_Convert_To (Typ, N));
                  Analyze (N);

               --  Case where we do not have fewer new discriminants than
               --  stored discriminants, so in this case we can simply use the
               --  stored discriminants of the subtype.

               else
                  Prepend_Stored_Values (Typ);
               end if;
            end Generate_Aggregate_For_Derived_Type;
         end if;

         if Is_Tagged_Type (Typ) then

            --  The tagged case, _parent and _tag component must be created

            --  Reset null_present unconditionally. tagged records always have
            --  at least one field (the tag or the parent)

            Set_Null_Record_Present (N, False);

            --  When the current aggregate comes from the expansion of an
            --  extension aggregate, the parent expr is replaced by an
            --  aggregate formed by selected components of this expr

            if Present (Parent_Expr)
              and then Is_Empty_List (Comps)
            then
               Comp := First_Component_Or_Discriminant (Typ);
               while Present (Comp) loop

                  --  Skip all expander-generated components

                  if
                    not Comes_From_Source (Original_Record_Component (Comp))
                  then
                     null;

                  else
                     New_Comp :=
                       Make_Selected_Component (Loc,
                         Prefix =>
                           Unchecked_Convert_To (Typ,
                             Duplicate_Subexpr (Parent_Expr, True)),

                         Selector_Name => New_Occurrence_Of (Comp, Loc));

                     Append_To (Comps,
                       Make_Component_Association (Loc,
                         Choices    =>
                           New_List (New_Occurrence_Of (Comp, Loc)),
                         Expression =>
                           New_Comp));

                     Analyze_And_Resolve (New_Comp, Etype (Comp));
                  end if;

                  Next_Component_Or_Discriminant (Comp);
               end loop;
            end if;

            --  Compute the value for the Tag now, if the type is a root it
            --  will be included in the aggregate right away, otherwise it will
            --  be propagated to the parent aggregate

            if Present (Orig_Tag) then
               Tag_Value := Orig_Tag;
            elsif not Tagged_Type_Expansion then
               Tag_Value := Empty;
            else
               Tag_Value :=
                 New_Occurrence_Of
                   (Node (First_Elmt (Access_Disp_Table (Typ))), Loc);
            end if;

            --  For a derived type, an aggregate for the parent is formed with
            --  all the inherited components.

            if Is_Derived_Type (Typ) then

               declare
                  First_Comp   : Node_Id;
                  Parent_Comps : List_Id;
                  Parent_Aggr  : Node_Id;
                  Parent_Name  : Node_Id;

               begin
                  --  Remove the inherited component association from the
                  --  aggregate and store them in the parent aggregate

                  First_Comp := First (Component_Associations (N));
                  Parent_Comps := New_List;
                  while Present (First_Comp)
                    and then Scope (Original_Record_Component (
                            Entity (First (Choices (First_Comp))))) /= Base_Typ
                  loop
                     Comp := First_Comp;
                     Next (First_Comp);
                     Remove (Comp);
                     Append (Comp, Parent_Comps);
                  end loop;

                  Parent_Aggr := Make_Aggregate (Loc,
                    Component_Associations => Parent_Comps);
                  Set_Etype (Parent_Aggr, Etype (Base_Type (Typ)));

                  --  Find the _parent component

                  Comp := First_Component (Typ);
                  while Chars (Comp) /= Name_uParent loop
                     Comp := Next_Component (Comp);
                  end loop;

                  Parent_Name := New_Occurrence_Of (Comp, Loc);

                  --  Insert the parent aggregate

                  Prepend_To (Component_Associations (N),
                    Make_Component_Association (Loc,
                      Choices    => New_List (Parent_Name),
                      Expression => Parent_Aggr));

                  --  Expand recursively the parent propagating the right Tag

                  Expand_Record_Aggregate (
                    Parent_Aggr, Tag_Value, Parent_Expr);
               end;

            --  For a root type, the tag component is added (unless compiling
            --  for the VMs, where tags are implicit).

            elsif Tagged_Type_Expansion then
               declare
                  Tag_Name  : constant Node_Id :=
                                New_Occurrence_Of
                                  (First_Tag_Component (Typ), Loc);
                  Typ_Tag   : constant Entity_Id := RTE (RE_Tag);
                  Conv_Node : constant Node_Id :=
                                Unchecked_Convert_To (Typ_Tag, Tag_Value);

               begin
                  Set_Etype (Conv_Node, Typ_Tag);
                  Prepend_To (Component_Associations (N),
                    Make_Component_Association (Loc,
                      Choices    => New_List (Tag_Name),
                      Expression => Conv_Node));
               end;
            end if;
         end if;
      end if;

   end Expand_Record_Aggregate;

   ----------------------------
   -- Has_Default_Init_Comps --
   ----------------------------

   function Has_Default_Init_Comps (N : Node_Id) return Boolean is
      Comps : constant List_Id := Component_Associations (N);
      C     : Node_Id;
      Expr  : Node_Id;
   begin
      pragma Assert (Nkind_In (N, N_Aggregate, N_Extension_Aggregate));

      if No (Comps) then
         return False;
      end if;

      if Has_Self_Reference (N) then
         return True;
      end if;

      --  Check if any direct component has default initialized components

      C := First (Comps);
      while Present (C) loop
         if Box_Present (C) then
            return True;
         end if;

         Next (C);
      end loop;

      --  Recursive call in case of aggregate expression

      C := First (Comps);
      while Present (C) loop
         Expr := Expression (C);

         if Present (Expr)
           and then
             Nkind_In (Expr, N_Aggregate, N_Extension_Aggregate)
           and then Has_Default_Init_Comps (Expr)
         then
            return True;
         end if;

         Next (C);
      end loop;

      return False;
   end Has_Default_Init_Comps;

   --------------------------
   -- Is_Delayed_Aggregate --
   --------------------------

   function Is_Delayed_Aggregate (N : Node_Id) return Boolean is
      Node : Node_Id   := N;
      Kind : Node_Kind := Nkind (Node);

   begin
      if Kind = N_Qualified_Expression then
         Node := Expression (Node);
         Kind := Nkind (Node);
      end if;

      if Kind /= N_Aggregate and then Kind /= N_Extension_Aggregate then
         return False;
      else
         return Expansion_Delayed (Node);
      end if;
   end Is_Delayed_Aggregate;

   ----------------------------------------
   -- Is_Static_Dispatch_Table_Aggregate --
   ----------------------------------------

   function Is_Static_Dispatch_Table_Aggregate (N : Node_Id) return Boolean is
      Typ : constant Entity_Id := Base_Type (Etype (N));

   begin
      return Static_Dispatch_Tables
        and then Tagged_Type_Expansion
        and then RTU_Loaded (Ada_Tags)

         --  Avoid circularity when rebuilding the compiler

        and then Cunit_Entity (Get_Source_Unit (N)) /= RTU_Entity (Ada_Tags)
        and then (Typ = RTE (RE_Dispatch_Table_Wrapper)
                    or else
                  Typ = RTE (RE_Address_Array)
                    or else
                  Typ = RTE (RE_Type_Specific_Data)
                    or else
                  Typ = RTE (RE_Tag_Table)
                    or else
                  (RTE_Available (RE_Interface_Data)
                     and then Typ = RTE (RE_Interface_Data))
                    or else
                  (RTE_Available (RE_Interfaces_Array)
                     and then Typ = RTE (RE_Interfaces_Array))
                    or else
                  (RTE_Available (RE_Interface_Data_Element)
                     and then Typ = RTE (RE_Interface_Data_Element)));
   end Is_Static_Dispatch_Table_Aggregate;

   --------------------
   -- Late_Expansion --
   --------------------

   function Late_Expansion
     (N      : Node_Id;
      Typ    : Entity_Id;
      Target : Node_Id;
      Flist  : Node_Id   := Empty;
      Obj    : Entity_Id := Empty) return List_Id
   is
   begin
      if Is_Record_Type (Etype (N)) then
         return Build_Record_Aggr_Code (N, Typ, Target, Flist, Obj);

      else pragma Assert (Is_Array_Type (Etype (N)));
         return
           Build_Array_Aggr_Code
             (N           => N,
              Ctype       => Component_Type (Etype (N)),
              Index       => First_Index (Typ),
              Into        => Target,
              Scalar_Comp => Is_Scalar_Type (Component_Type (Typ)),
              Indexes     => No_List,
              Flist       => Flist);
      end if;
   end Late_Expansion;

   ----------------------------------
   -- Make_OK_Assignment_Statement --
   ----------------------------------

   function Make_OK_Assignment_Statement
     (Sloc       : Source_Ptr;
      Name       : Node_Id;
      Expression : Node_Id) return Node_Id
   is
   begin
      Set_Assignment_OK (Name);

      return Make_Assignment_Statement (Sloc, Name, Expression);
   end Make_OK_Assignment_Statement;

   -----------------------
   -- Number_Of_Choices --
   -----------------------

   function Number_Of_Choices (N : Node_Id) return Nat is
      Assoc  : Node_Id;
      Choice : Node_Id;

      Nb_Choices : Nat := 0;

   begin
      if Present (Expressions (N)) then
         return 0;
      end if;

      Assoc := First (Component_Associations (N));
      while Present (Assoc) loop
         Choice := First (Choices (Assoc));
         while Present (Choice) loop
            if Nkind (Choice) /= N_Others_Choice then
               Nb_Choices := Nb_Choices + 1;
            end if;

            Next (Choice);
         end loop;

         Next (Assoc);
      end loop;

      return Nb_Choices;
   end Number_Of_Choices;

   ------------------------------------
   -- Packed_Array_Aggregate_Handled --
   ------------------------------------

   --  The current version of this procedure will handle at compile time
   --  any array aggregate that meets these conditions:

   --    One dimensional, bit packed
   --    Underlying packed type is modular type
   --    Bounds are within 32-bit Int range
   --    All bounds and values are static

   function Packed_Array_Aggregate_Handled (N : Node_Id) return Boolean is
      Loc  : constant Source_Ptr := Sloc (N);
      Typ  : constant Entity_Id  := Etype (N);
      Ctyp : constant Entity_Id  := Component_Type (Typ);

      Not_Handled : exception;
      --  Exception raised if this aggregate cannot be handled

   begin
      --  For now, handle only one dimensional bit packed arrays

      if not Is_Bit_Packed_Array (Typ)
        or else Number_Dimensions (Typ) > 1
        or else not Is_Modular_Integer_Type (Packed_Array_Type (Typ))
      then
         return False;
      end if;

      if not Is_Scalar_Type (Component_Type (Typ))
        and then Has_Non_Standard_Rep (Component_Type (Typ))
      then
         return False;
      end if;

      declare
         Csiz  : constant Nat := UI_To_Int (Component_Size (Typ));

         Lo : Node_Id;
         Hi : Node_Id;
         --  Bounds of index type

         Lob : Uint;
         Hib : Uint;
         --  Values of bounds if compile time known

         function Get_Component_Val (N : Node_Id) return Uint;
         --  Given a expression value N of the component type Ctyp, returns a
         --  value of Csiz (component size) bits representing this value. If
         --  the value is non-static or any other reason exists why the value
         --  cannot be returned, then Not_Handled is raised.

         -----------------------
         -- Get_Component_Val --
         -----------------------

         function Get_Component_Val (N : Node_Id) return Uint is
            Val  : Uint;

         begin
            --  We have to analyze the expression here before doing any further
            --  processing here. The analysis of such expressions is deferred
            --  till expansion to prevent some problems of premature analysis.

            Analyze_And_Resolve (N, Ctyp);

            --  Must have a compile time value. String literals have to be
            --  converted into temporaries as well, because they cannot easily
            --  be converted into their bit representation.

            if not Compile_Time_Known_Value (N)
              or else Nkind (N) = N_String_Literal
            then
               raise Not_Handled;
            end if;

            Val := Expr_Rep_Value (N);

            --  Adjust for bias, and strip proper number of bits

            if Has_Biased_Representation (Ctyp) then
               Val := Val - Expr_Value (Type_Low_Bound (Ctyp));
            end if;

            return Val mod Uint_2 ** Csiz;
         end Get_Component_Val;

      --  Here we know we have a one dimensional bit packed array

      begin
         Get_Index_Bounds (First_Index (Typ), Lo, Hi);

         --  Cannot do anything if bounds are dynamic

         if not Compile_Time_Known_Value (Lo)
              or else
            not Compile_Time_Known_Value (Hi)
         then
            return False;
         end if;

         --  Or are silly out of range of int bounds

         Lob := Expr_Value (Lo);
         Hib := Expr_Value (Hi);

         if not UI_Is_In_Int_Range (Lob)
              or else
            not UI_Is_In_Int_Range (Hib)
         then
            return False;
         end if;

         --  At this stage we have a suitable aggregate for handling at compile
         --  time (the only remaining checks are that the values of expressions
         --  in the aggregate are compile time known (check is performed by
         --  Get_Component_Val), and that any subtypes or ranges are statically
         --  known.

         --  If the aggregate is not fully positional at this stage, then
         --  convert it to positional form. Either this will fail, in which
         --  case we can do nothing, or it will succeed, in which case we have
         --  succeeded in handling the aggregate, or it will stay an aggregate,
         --  in which case we have failed to handle this case.

         if Present (Component_Associations (N)) then
            Convert_To_Positional
             (N, Max_Others_Replicate => 64, Handle_Bit_Packed => True);
            return Nkind (N) /= N_Aggregate;
         end if;

         --  Otherwise we are all positional, so convert to proper value

         declare
            Lov : constant Int := UI_To_Int (Lob);
            Hiv : constant Int := UI_To_Int (Hib);

            Len : constant Nat := Int'Max (0, Hiv - Lov + 1);
            --  The length of the array (number of elements)

            Aggregate_Val : Uint;
            --  Value of aggregate. The value is set in the low order bits of
            --  this value. For the little-endian case, the values are stored
            --  from low-order to high-order and for the big-endian case the
            --  values are stored from high-order to low-order. Note that gigi
            --  will take care of the conversions to left justify the value in
            --  the big endian case (because of left justified modular type
            --  processing), so we do not have to worry about that here.

            Lit : Node_Id;
            --  Integer literal for resulting constructed value

            Shift : Nat;
            --  Shift count from low order for next value

            Incr : Int;
            --  Shift increment for loop

            Expr : Node_Id;
            --  Next expression from positional parameters of aggregate

         begin
            --  For little endian, we fill up the low order bits of the target
            --  value. For big endian we fill up the high order bits of the
            --  target value (which is a left justified modular value).

            if Bytes_Big_Endian xor Debug_Flag_8 then
               Shift := Csiz * (Len - 1);
               Incr  := -Csiz;
            else
               Shift := 0;
               Incr  := +Csiz;
            end if;

            --  Loop to set the values

            if Len = 0 then
               Aggregate_Val := Uint_0;
            else
               Expr := First (Expressions (N));
               Aggregate_Val := Get_Component_Val (Expr) * Uint_2 ** Shift;

               for J in 2 .. Len loop
                  Shift := Shift + Incr;
                  Next (Expr);
                  Aggregate_Val :=
                    Aggregate_Val + Get_Component_Val (Expr) * Uint_2 ** Shift;
               end loop;
            end if;

            --  Now we can rewrite with the proper value

            Lit :=
              Make_Integer_Literal (Loc,
                Intval => Aggregate_Val);
            Set_Print_In_Hex (Lit);

            --  Construct the expression using this literal. Note that it is
            --  important to qualify the literal with its proper modular type
            --  since universal integer does not have the required range and
            --  also this is a left justified modular type, which is important
            --  in the big-endian case.

            Rewrite (N,
              Unchecked_Convert_To (Typ,
                Make_Qualified_Expression (Loc,
                  Subtype_Mark =>
                    New_Occurrence_Of (Packed_Array_Type (Typ), Loc),
                  Expression   => Lit)));

            Analyze_And_Resolve (N, Typ);
            return True;
         end;
      end;

   exception
      when Not_Handled =>
         return False;
   end Packed_Array_Aggregate_Handled;

   ----------------------------
   -- Has_Mutable_Components --
   ----------------------------

   function Has_Mutable_Components (Typ : Entity_Id) return Boolean is
      Comp : Entity_Id;

   begin
      Comp := First_Component (Typ);
      while Present (Comp) loop
         if Is_Record_Type (Etype (Comp))
           and then Has_Discriminants (Etype (Comp))
           and then not Is_Constrained (Etype (Comp))
         then
            return True;
         end if;

         Next_Component (Comp);
      end loop;

      return False;
   end Has_Mutable_Components;

   ------------------------------
   -- Initialize_Discriminants --
   ------------------------------

   procedure Initialize_Discriminants (N : Node_Id; Typ : Entity_Id) is
      Loc  : constant Source_Ptr := Sloc (N);
      Bas  : constant Entity_Id  := Base_Type (Typ);
      Par  : constant Entity_Id  := Etype (Bas);
      Decl : constant Node_Id    := Parent (Par);
      Ref  : Node_Id;

   begin
      if Is_Tagged_Type (Bas)
        and then Is_Derived_Type (Bas)
        and then Has_Discriminants (Par)
        and then Has_Discriminants (Bas)
        and then Number_Discriminants (Bas) /= Number_Discriminants (Par)
        and then Nkind (Decl) = N_Full_Type_Declaration
        and then Nkind (Type_Definition (Decl)) = N_Record_Definition
        and then Present
          (Variant_Part (Component_List (Type_Definition (Decl))))
        and then Nkind (N) /= N_Extension_Aggregate
      then

         --   Call init proc to set discriminants.
         --   There should eventually be a special procedure for this ???

         Ref := New_Reference_To (Defining_Identifier (N), Loc);
         Insert_Actions_After (N,
           Build_Initialization_Call (Sloc (N), Ref, Typ));
      end if;
   end Initialize_Discriminants;

   ----------------
   -- Must_Slide --
   ----------------

   function Must_Slide
     (Obj_Type : Entity_Id;
      Typ      : Entity_Id) return Boolean
   is
      L1, L2, H1, H2 : Node_Id;
   begin
      --  No sliding if the type of the object is not established yet, if it is
      --  an unconstrained type whose actual subtype comes from the aggregate,
      --  or if the two types are identical.

      if not Is_Array_Type (Obj_Type) then
         return False;

      elsif not Is_Constrained (Obj_Type) then
         return False;

      elsif Typ = Obj_Type then
         return False;

      else
         --  Sliding can only occur along the first dimension

         Get_Index_Bounds (First_Index (Typ), L1, H1);
         Get_Index_Bounds (First_Index (Obj_Type), L2, H2);

         if not Is_Static_Expression (L1)
           or else not Is_Static_Expression (L2)
           or else not Is_Static_Expression (H1)
           or else not Is_Static_Expression (H2)
         then
            return False;
         else
            return Expr_Value (L1) /= Expr_Value (L2)
              or else Expr_Value (H1) /= Expr_Value (H2);
         end if;
      end if;
   end Must_Slide;

   ---------------------------
   -- Safe_Slice_Assignment --
   ---------------------------

   function Safe_Slice_Assignment (N : Node_Id) return Boolean is
      Loc        : constant Source_Ptr := Sloc (Parent (N));
      Pref       : constant Node_Id    := Prefix (Name (Parent (N)));
      Range_Node : constant Node_Id    := Discrete_Range (Name (Parent (N)));
      Expr       : Node_Id;
      L_J        : Entity_Id;
      L_Iter     : Node_Id;
      L_Body     : Node_Id;
      Stat       : Node_Id;

   begin
      --  Generate: for J in Range loop Pref (J) := Expr; end loop;

      if Comes_From_Source (N)
        and then No (Expressions (N))
        and then Nkind (First (Choices (First (Component_Associations (N)))))
                   = N_Others_Choice
      then
         Expr := Expression (First (Component_Associations (N)));
         L_J := Make_Temporary (Loc, 'J');

         L_Iter :=
           Make_Iteration_Scheme (Loc,
             Loop_Parameter_Specification =>
               Make_Loop_Parameter_Specification
                 (Loc,
                  Defining_Identifier         => L_J,
                  Discrete_Subtype_Definition => Relocate_Node (Range_Node)));

         L_Body :=
           Make_Assignment_Statement (Loc,
              Name =>
                Make_Indexed_Component (Loc,
                  Prefix      => Relocate_Node (Pref),
                  Expressions => New_List (New_Occurrence_Of (L_J, Loc))),
               Expression => Relocate_Node (Expr));

         --  Construct the final loop

         Stat :=
           Make_Implicit_Loop_Statement
             (Node             => Parent (N),
              Identifier       => Empty,
              Iteration_Scheme => L_Iter,
              Statements       => New_List (L_Body));

         --  Set type of aggregate to be type of lhs in assignment,
         --  to suppress redundant length checks.

         Set_Etype (N, Etype (Name (Parent (N))));

         Rewrite (Parent (N), Stat);
         Analyze (Parent (N));
         return True;

      else
         return False;
      end if;
   end Safe_Slice_Assignment;

   ---------------------
   -- Sort_Case_Table --
   ---------------------

   procedure Sort_Case_Table (Case_Table : in out Case_Table_Type) is
      L : constant Int := Case_Table'First;
      U : constant Int := Case_Table'Last;
      K : Int;
      J : Int;
      T : Case_Bounds;

   begin
      K := L;
      while K /= U loop
         T := Case_Table (K + 1);

         J := K + 1;
         while J /= L
           and then Expr_Value (Case_Table (J - 1).Choice_Lo) >
                    Expr_Value (T.Choice_Lo)
         loop
            Case_Table (J) := Case_Table (J - 1);
            J := J - 1;
         end loop;

         Case_Table (J) := T;
         K := K + 1;
      end loop;
   end Sort_Case_Table;

   ----------------------------
   -- Static_Array_Aggregate --
   ----------------------------

   function Static_Array_Aggregate (N : Node_Id) return Boolean is
      Bounds : constant Node_Id := Aggregate_Bounds (N);

      Typ       : constant Entity_Id := Etype (N);
      Comp_Type : constant Entity_Id := Component_Type (Typ);
      Agg       : Node_Id;
      Expr      : Node_Id;
      Lo        : Node_Id;
      Hi        : Node_Id;

   begin
      if Is_Tagged_Type (Typ)
        or else Is_Controlled (Typ)
        or else Is_Packed (Typ)
      then
         return False;
      end if;

      if Present (Bounds)
        and then Nkind (Bounds) = N_Range
        and then Nkind (Low_Bound  (Bounds)) = N_Integer_Literal
        and then Nkind (High_Bound (Bounds)) = N_Integer_Literal
      then
         Lo := Low_Bound  (Bounds);
         Hi := High_Bound (Bounds);

         if No (Component_Associations (N)) then

            --  Verify that all components are static integers

            Expr := First (Expressions (N));
            while Present (Expr) loop
               if Nkind (Expr) /= N_Integer_Literal then
                  return False;
               end if;

               Next (Expr);
            end loop;

            return True;

         else
            --  We allow only a single named association, either a static
            --  range or an others_clause, with a static expression.

            Expr := First (Component_Associations (N));

            if Present (Expressions (N)) then
               return False;

            elsif Present (Next (Expr)) then
               return False;

            elsif Present (Next (First (Choices (Expr)))) then
               return False;

            else
               --  The aggregate is static if all components are literals,
               --  or else all its components are static aggregates for the
               --  component type. We also limit the size of a static aggregate
               --  to prevent runaway static expressions.

               if Is_Array_Type (Comp_Type)
                 or else Is_Record_Type (Comp_Type)
               then
                  if Nkind (Expression (Expr)) /= N_Aggregate
                    or else
                      not Compile_Time_Known_Aggregate (Expression (Expr))
                  then
                     return False;
                  end if;

               elsif Nkind (Expression (Expr)) /= N_Integer_Literal then
                  return False;

               elsif not Aggr_Size_OK (N, Typ) then
                  return False;
               end if;

               --  Create a positional aggregate with the right number of
               --  copies of the expression.

               Agg := Make_Aggregate (Sloc (N), New_List, No_List);

               for I in UI_To_Int (Intval (Lo)) .. UI_To_Int (Intval (Hi))
               loop
                  Append_To
                    (Expressions (Agg), New_Copy (Expression (Expr)));

                  --  The copied expression must be analyzed and resolved.
                  --  Besides setting the type, this ensures that static
                  --  expressions are appropriately marked as such.

                  Analyze_And_Resolve
                    (Last (Expressions (Agg)), Component_Type (Typ));
               end loop;

               Set_Aggregate_Bounds (Agg, Bounds);
               Set_Etype (Agg, Typ);
               Set_Analyzed (Agg);
               Rewrite (N, Agg);
               Set_Compile_Time_Known_Aggregate (N);

               return True;
            end if;
         end if;

      else
         return False;
      end if;
   end Static_Array_Aggregate;

end Exp_Aggr;