summaryrefslogtreecommitdiff
path: root/clang/lib/AST/ItaniumMangle.cpp
blob: 0d405f1f57f21eca4b47bf9d205ab7d18b9d5bb2 (about) (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
//===--- ItaniumMangle.cpp - Itanium C++ Name Mangling ----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implements C++ name mangling according to the Itanium C++ ABI,
// which is used in GCC 3.2 and newer (and many compilers that are
// ABI-compatible with GCC):
//
//   http://www.codesourcery.com/public/cxx-abi/abi.html
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Mangle.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/TypeLoc.h"
#include "clang/Basic/ABI.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/ErrorHandling.h"

#define MANGLE_CHECKER 0

#if MANGLE_CHECKER
#include <cxxabi.h>
#endif

using namespace clang;

namespace {

/// \brief Retrieve the declaration context that should be used when mangling 
/// the given declaration.
static const DeclContext *getEffectiveDeclContext(const Decl *D) {
  // The ABI assumes that lambda closure types that occur within 
  // default arguments live in the context of the function. However, due to
  // the way in which Clang parses and creates function declarations, this is
  // not the case: the lambda closure type ends up living in the context 
  // where the function itself resides, because the function declaration itself
  // had not yet been created. Fix the context here.
  if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) {
    if (RD->isLambda())
      if (ParmVarDecl *ContextParam
            = dyn_cast_or_null<ParmVarDecl>(RD->getLambdaContextDecl()))
        return ContextParam->getDeclContext();
  }
  
  return D->getDeclContext();
}

static const DeclContext *getEffectiveParentContext(const DeclContext *DC) {
  return getEffectiveDeclContext(cast<Decl>(DC));
}
  
static const CXXRecordDecl *GetLocalClassDecl(const NamedDecl *ND) {
  const DeclContext *DC = dyn_cast<DeclContext>(ND);
  if (!DC)
    DC = getEffectiveDeclContext(ND);
  while (!DC->isNamespace() && !DC->isTranslationUnit()) {
    const DeclContext *Parent = getEffectiveDeclContext(cast<Decl>(DC));
    if (isa<FunctionDecl>(Parent))
      return dyn_cast<CXXRecordDecl>(DC);
    DC = Parent;
  }
  return 0;
}

static const FunctionDecl *getStructor(const FunctionDecl *fn) {
  if (const FunctionTemplateDecl *ftd = fn->getPrimaryTemplate())
    return ftd->getTemplatedDecl();

  return fn;
}

static const NamedDecl *getStructor(const NamedDecl *decl) {
  const FunctionDecl *fn = dyn_cast_or_null<FunctionDecl>(decl);
  return (fn ? getStructor(fn) : decl);
}
                                                    
static const unsigned UnknownArity = ~0U;

class ItaniumMangleContext : public MangleContext {
  llvm::DenseMap<const TagDecl *, uint64_t> AnonStructIds;
  unsigned Discriminator;
  llvm::DenseMap<const NamedDecl*, unsigned> Uniquifier;
  
public:
  explicit ItaniumMangleContext(ASTContext &Context,
                                DiagnosticsEngine &Diags)
    : MangleContext(Context, Diags) { }

  uint64_t getAnonymousStructId(const TagDecl *TD) {
    std::pair<llvm::DenseMap<const TagDecl *,
      uint64_t>::iterator, bool> Result =
      AnonStructIds.insert(std::make_pair(TD, AnonStructIds.size()));
    return Result.first->second;
  }

  void startNewFunction() {
    MangleContext::startNewFunction();
    mangleInitDiscriminator();
  }

  /// @name Mangler Entry Points
  /// @{

  bool shouldMangleDeclName(const NamedDecl *D);
  void mangleName(const NamedDecl *D, raw_ostream &);
  void mangleThunk(const CXXMethodDecl *MD,
                   const ThunkInfo &Thunk,
                   raw_ostream &);
  void mangleCXXDtorThunk(const CXXDestructorDecl *DD, CXXDtorType Type,
                          const ThisAdjustment &ThisAdjustment,
                          raw_ostream &);
  void mangleReferenceTemporary(const VarDecl *D,
                                raw_ostream &);
  void mangleCXXVTable(const CXXRecordDecl *RD,
                       raw_ostream &);
  void mangleCXXVTT(const CXXRecordDecl *RD,
                    raw_ostream &);
  void mangleCXXCtorVTable(const CXXRecordDecl *RD, int64_t Offset,
                           const CXXRecordDecl *Type,
                           raw_ostream &);
  void mangleCXXRTTI(QualType T, raw_ostream &);
  void mangleCXXRTTIName(QualType T, raw_ostream &);
  void mangleCXXCtor(const CXXConstructorDecl *D, CXXCtorType Type,
                     raw_ostream &);
  void mangleCXXDtor(const CXXDestructorDecl *D, CXXDtorType Type,
                     raw_ostream &);

  void mangleItaniumGuardVariable(const VarDecl *D, raw_ostream &);

  void mangleInitDiscriminator() {
    Discriminator = 0;
  }

  bool getNextDiscriminator(const NamedDecl *ND, unsigned &disc) {
    // Lambda closure types with external linkage (indicated by a 
    // non-zero lambda mangling number) have their own numbering scheme, so
    // they do not need a discriminator.
    if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(ND))
      if (RD->isLambda() && RD->getLambdaManglingNumber() > 0)
        return false;
        
    unsigned &discriminator = Uniquifier[ND];
    if (!discriminator)
      discriminator = ++Discriminator;
    if (discriminator == 1)
      return false;
    disc = discriminator-2;
    return true;
  }
  /// @}
};

/// CXXNameMangler - Manage the mangling of a single name.
class CXXNameMangler {
  ItaniumMangleContext &Context;
  raw_ostream &Out;

  /// The "structor" is the top-level declaration being mangled, if
  /// that's not a template specialization; otherwise it's the pattern
  /// for that specialization.
  const NamedDecl *Structor;
  unsigned StructorType;

  /// SeqID - The next subsitution sequence number.
  unsigned SeqID;

  class FunctionTypeDepthState {
    unsigned Bits;

    enum { InResultTypeMask = 1 };

  public:
    FunctionTypeDepthState() : Bits(0) {}

    /// The number of function types we're inside.
    unsigned getDepth() const {
      return Bits >> 1;
    }

    /// True if we're in the return type of the innermost function type.
    bool isInResultType() const {
      return Bits & InResultTypeMask;
    }

    FunctionTypeDepthState push() {
      FunctionTypeDepthState tmp = *this;
      Bits = (Bits & ~InResultTypeMask) + 2;
      return tmp;
    }

    void enterResultType() {
      Bits |= InResultTypeMask;
    }

    void leaveResultType() {
      Bits &= ~InResultTypeMask;
    }

    void pop(FunctionTypeDepthState saved) {
      assert(getDepth() == saved.getDepth() + 1);
      Bits = saved.Bits;
    }

  } FunctionTypeDepth;

  llvm::DenseMap<uintptr_t, unsigned> Substitutions;

  ASTContext &getASTContext() const { return Context.getASTContext(); }

public:
  CXXNameMangler(ItaniumMangleContext &C, raw_ostream &Out_,
                 const NamedDecl *D = 0)
    : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(0),
      SeqID(0) {
    // These can't be mangled without a ctor type or dtor type.
    assert(!D || (!isa<CXXDestructorDecl>(D) &&
                  !isa<CXXConstructorDecl>(D)));
  }
  CXXNameMangler(ItaniumMangleContext &C, raw_ostream &Out_,
                 const CXXConstructorDecl *D, CXXCtorType Type)
    : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
      SeqID(0) { }
  CXXNameMangler(ItaniumMangleContext &C, raw_ostream &Out_,
                 const CXXDestructorDecl *D, CXXDtorType Type)
    : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
      SeqID(0) { }

#if MANGLE_CHECKER
  ~CXXNameMangler() {
    if (Out.str()[0] == '\01')
      return;

    int status = 0;
    char *result = abi::__cxa_demangle(Out.str().str().c_str(), 0, 0, &status);
    assert(status == 0 && "Could not demangle mangled name!");
    free(result);
  }
#endif
  raw_ostream &getStream() { return Out; }

  void mangle(const NamedDecl *D, StringRef Prefix = "_Z");
  void mangleCallOffset(int64_t NonVirtual, int64_t Virtual);
  void mangleNumber(const llvm::APSInt &I);
  void mangleNumber(int64_t Number);
  void mangleFloat(const llvm::APFloat &F);
  void mangleFunctionEncoding(const FunctionDecl *FD);
  void mangleName(const NamedDecl *ND);
  void mangleType(QualType T);
  void mangleNameOrStandardSubstitution(const NamedDecl *ND);
  
private:
  bool mangleSubstitution(const NamedDecl *ND);
  bool mangleSubstitution(QualType T);
  bool mangleSubstitution(TemplateName Template);
  bool mangleSubstitution(uintptr_t Ptr);

  void mangleExistingSubstitution(QualType type);
  void mangleExistingSubstitution(TemplateName name);

  bool mangleStandardSubstitution(const NamedDecl *ND);

  void addSubstitution(const NamedDecl *ND) {
    ND = cast<NamedDecl>(ND->getCanonicalDecl());

    addSubstitution(reinterpret_cast<uintptr_t>(ND));
  }
  void addSubstitution(QualType T);
  void addSubstitution(TemplateName Template);
  void addSubstitution(uintptr_t Ptr);

  void mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
                              NamedDecl *firstQualifierLookup,
                              bool recursive = false);
  void mangleUnresolvedName(NestedNameSpecifier *qualifier,
                            NamedDecl *firstQualifierLookup,
                            DeclarationName name,
                            unsigned KnownArity = UnknownArity);

  void mangleName(const TemplateDecl *TD,
                  const TemplateArgument *TemplateArgs,
                  unsigned NumTemplateArgs);
  void mangleUnqualifiedName(const NamedDecl *ND) {
    mangleUnqualifiedName(ND, ND->getDeclName(), UnknownArity);
  }
  void mangleUnqualifiedName(const NamedDecl *ND, DeclarationName Name,
                             unsigned KnownArity);
  void mangleUnscopedName(const NamedDecl *ND);
  void mangleUnscopedTemplateName(const TemplateDecl *ND);
  void mangleUnscopedTemplateName(TemplateName);
  void mangleSourceName(const IdentifierInfo *II);
  void mangleLocalName(const NamedDecl *ND);
  void mangleLambda(const CXXRecordDecl *Lambda);
  void mangleNestedName(const NamedDecl *ND, const DeclContext *DC,
                        bool NoFunction=false);
  void mangleNestedName(const TemplateDecl *TD,
                        const TemplateArgument *TemplateArgs,
                        unsigned NumTemplateArgs);
  void manglePrefix(NestedNameSpecifier *qualifier);
  void manglePrefix(const DeclContext *DC, bool NoFunction=false);
  void manglePrefix(QualType type);
  void mangleTemplatePrefix(const TemplateDecl *ND);
  void mangleTemplatePrefix(TemplateName Template);
  void mangleOperatorName(OverloadedOperatorKind OO, unsigned Arity);
  void mangleQualifiers(Qualifiers Quals);
  void mangleRefQualifier(RefQualifierKind RefQualifier);

  void mangleObjCMethodName(const ObjCMethodDecl *MD);

  // Declare manglers for every type class.
#define ABSTRACT_TYPE(CLASS, PARENT)
#define NON_CANONICAL_TYPE(CLASS, PARENT)
#define TYPE(CLASS, PARENT) void mangleType(const CLASS##Type *T);
#include "clang/AST/TypeNodes.def"

  void mangleType(const TagType*);
  void mangleType(TemplateName);
  void mangleBareFunctionType(const FunctionType *T,
                              bool MangleReturnType);
  void mangleNeonVectorType(const VectorType *T);

  void mangleIntegerLiteral(QualType T, const llvm::APSInt &Value);
  void mangleMemberExpr(const Expr *base, bool isArrow,
                        NestedNameSpecifier *qualifier,
                        NamedDecl *firstQualifierLookup,
                        DeclarationName name,
                        unsigned knownArity);
  void mangleExpression(const Expr *E, unsigned Arity = UnknownArity);
  void mangleCXXCtorType(CXXCtorType T);
  void mangleCXXDtorType(CXXDtorType T);

  void mangleTemplateArgs(const ASTTemplateArgumentListInfo &TemplateArgs);
  void mangleTemplateArgs(TemplateName Template,
                          const TemplateArgument *TemplateArgs,
                          unsigned NumTemplateArgs);  
  void mangleTemplateArgs(const TemplateParameterList &PL,
                          const TemplateArgument *TemplateArgs,
                          unsigned NumTemplateArgs);
  void mangleTemplateArgs(const TemplateParameterList &PL,
                          const TemplateArgumentList &AL);
  void mangleTemplateArg(const NamedDecl *P, TemplateArgument A);
  void mangleUnresolvedTemplateArgs(const TemplateArgument *args,
                                    unsigned numArgs);

  void mangleTemplateParameter(unsigned Index);

  void mangleFunctionParam(const ParmVarDecl *parm);
};

}

static bool isInCLinkageSpecification(const Decl *D) {
  D = D->getCanonicalDecl();
  for (const DeclContext *DC = getEffectiveDeclContext(D);
       !DC->isTranslationUnit(); DC = getEffectiveParentContext(DC)) {
    if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC))
      return Linkage->getLanguage() == LinkageSpecDecl::lang_c;
  }

  return false;
}

bool ItaniumMangleContext::shouldMangleDeclName(const NamedDecl *D) {
  // In C, functions with no attributes never need to be mangled. Fastpath them.
  if (!getASTContext().getLangOpts().CPlusPlus && !D->hasAttrs())
    return false;

  // Any decl can be declared with __asm("foo") on it, and this takes precedence
  // over all other naming in the .o file.
  if (D->hasAttr<AsmLabelAttr>())
    return true;

  // Clang's "overloadable" attribute extension to C/C++ implies name mangling
  // (always) as does passing a C++ member function and a function
  // whose name is not a simple identifier.
  const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
  if (FD && (FD->hasAttr<OverloadableAttr>() || isa<CXXMethodDecl>(FD) ||
             !FD->getDeclName().isIdentifier()))
    return true;

  // Otherwise, no mangling is done outside C++ mode.
  if (!getASTContext().getLangOpts().CPlusPlus)
    return false;

  // Variables at global scope with non-internal linkage are not mangled
  if (!FD) {
    const DeclContext *DC = getEffectiveDeclContext(D);
    // Check for extern variable declared locally.
    if (DC->isFunctionOrMethod() && D->hasLinkage())
      while (!DC->isNamespace() && !DC->isTranslationUnit())
        DC = getEffectiveParentContext(DC);
    if (DC->isTranslationUnit() && D->getLinkage() != InternalLinkage)
      return false;
  }

  // Class members are always mangled.
  if (getEffectiveDeclContext(D)->isRecord())
    return true;

  // C functions and "main" are not mangled.
  if ((FD && FD->isMain()) || isInCLinkageSpecification(D))
    return false;

  return true;
}

void CXXNameMangler::mangle(const NamedDecl *D, StringRef Prefix) {
  // Any decl can be declared with __asm("foo") on it, and this takes precedence
  // over all other naming in the .o file.
  if (const AsmLabelAttr *ALA = D->getAttr<AsmLabelAttr>()) {
    // If we have an asm name, then we use it as the mangling.

    // Adding the prefix can cause problems when one file has a "foo" and
    // another has a "\01foo". That is known to happen on ELF with the
    // tricks normally used for producing aliases (PR9177). Fortunately the
    // llvm mangler on ELF is a nop, so we can just avoid adding the \01
    // marker.  We also avoid adding the marker if this is an alias for an
    // LLVM intrinsic.
    StringRef UserLabelPrefix =
      getASTContext().getTargetInfo().getUserLabelPrefix();
    if (!UserLabelPrefix.empty() && !ALA->getLabel().startswith("llvm."))
      Out << '\01';  // LLVM IR Marker for __asm("foo")

    Out << ALA->getLabel();
    return;
  }

  // <mangled-name> ::= _Z <encoding>
  //            ::= <data name>
  //            ::= <special-name>
  Out << Prefix;
  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
    mangleFunctionEncoding(FD);
  else if (const VarDecl *VD = dyn_cast<VarDecl>(D))
    mangleName(VD);
  else
    mangleName(cast<FieldDecl>(D));
}

void CXXNameMangler::mangleFunctionEncoding(const FunctionDecl *FD) {
  // <encoding> ::= <function name> <bare-function-type>
  mangleName(FD);

  // Don't mangle in the type if this isn't a decl we should typically mangle.
  if (!Context.shouldMangleDeclName(FD))
    return;

  // Whether the mangling of a function type includes the return type depends on
  // the context and the nature of the function. The rules for deciding whether
  // the return type is included are:
  //
  //   1. Template functions (names or types) have return types encoded, with
  //   the exceptions listed below.
  //   2. Function types not appearing as part of a function name mangling,
  //   e.g. parameters, pointer types, etc., have return type encoded, with the
  //   exceptions listed below.
  //   3. Non-template function names do not have return types encoded.
  //
  // The exceptions mentioned in (1) and (2) above, for which the return type is
  // never included, are
  //   1. Constructors.
  //   2. Destructors.
  //   3. Conversion operator functions, e.g. operator int.
  bool MangleReturnType = false;
  if (FunctionTemplateDecl *PrimaryTemplate = FD->getPrimaryTemplate()) {
    if (!(isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD) ||
          isa<CXXConversionDecl>(FD)))
      MangleReturnType = true;

    // Mangle the type of the primary template.
    FD = PrimaryTemplate->getTemplatedDecl();
  }

  mangleBareFunctionType(FD->getType()->getAs<FunctionType>(), 
                         MangleReturnType);
}

static const DeclContext *IgnoreLinkageSpecDecls(const DeclContext *DC) {
  while (isa<LinkageSpecDecl>(DC)) {
    DC = getEffectiveParentContext(DC);
  }

  return DC;
}

/// isStd - Return whether a given namespace is the 'std' namespace.
static bool isStd(const NamespaceDecl *NS) {
  if (!IgnoreLinkageSpecDecls(getEffectiveParentContext(NS))
                                ->isTranslationUnit())
    return false;
  
  const IdentifierInfo *II = NS->getOriginalNamespace()->getIdentifier();
  return II && II->isStr("std");
}

// isStdNamespace - Return whether a given decl context is a toplevel 'std'
// namespace.
static bool isStdNamespace(const DeclContext *DC) {
  if (!DC->isNamespace())
    return false;

  return isStd(cast<NamespaceDecl>(DC));
}

static const TemplateDecl *
isTemplate(const NamedDecl *ND, const TemplateArgumentList *&TemplateArgs) {
  // Check if we have a function template.
  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)){
    if (const TemplateDecl *TD = FD->getPrimaryTemplate()) {
      TemplateArgs = FD->getTemplateSpecializationArgs();
      return TD;
    }
  }

  // Check if we have a class template.
  if (const ClassTemplateSpecializationDecl *Spec =
        dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
    TemplateArgs = &Spec->getTemplateArgs();
    return Spec->getSpecializedTemplate();
  }

  return 0;
}

static bool isLambda(const NamedDecl *ND) {
  const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(ND);
  if (!Record)
    return false;
  
  return Record->isLambda();
}

void CXXNameMangler::mangleName(const NamedDecl *ND) {
  //  <name> ::= <nested-name>
  //         ::= <unscoped-name>
  //         ::= <unscoped-template-name> <template-args>
  //         ::= <local-name>
  //
  const DeclContext *DC = getEffectiveDeclContext(ND);

  // If this is an extern variable declared locally, the relevant DeclContext
  // is that of the containing namespace, or the translation unit.
  // FIXME: This is a hack; extern variables declared locally should have
  // a proper semantic declaration context!
  if (isa<FunctionDecl>(DC) && ND->hasLinkage() && !isLambda(ND))
    while (!DC->isNamespace() && !DC->isTranslationUnit())
      DC = getEffectiveParentContext(DC);
  else if (GetLocalClassDecl(ND)) {
    mangleLocalName(ND);
    return;
  }

  DC = IgnoreLinkageSpecDecls(DC);

  if (DC->isTranslationUnit() || isStdNamespace(DC)) {
    // Check if we have a template.
    const TemplateArgumentList *TemplateArgs = 0;
    if (const TemplateDecl *TD = isTemplate(ND, TemplateArgs)) {
      mangleUnscopedTemplateName(TD);
      TemplateParameterList *TemplateParameters = TD->getTemplateParameters();
      mangleTemplateArgs(*TemplateParameters, *TemplateArgs);
      return;
    }

    mangleUnscopedName(ND);
    return;
  }

  if (isa<FunctionDecl>(DC) || isa<ObjCMethodDecl>(DC)) {
    mangleLocalName(ND);
    return;
  }

  mangleNestedName(ND, DC);
}
void CXXNameMangler::mangleName(const TemplateDecl *TD,
                                const TemplateArgument *TemplateArgs,
                                unsigned NumTemplateArgs) {
  const DeclContext *DC = IgnoreLinkageSpecDecls(getEffectiveDeclContext(TD));

  if (DC->isTranslationUnit() || isStdNamespace(DC)) {
    mangleUnscopedTemplateName(TD);
    TemplateParameterList *TemplateParameters = TD->getTemplateParameters();
    mangleTemplateArgs(*TemplateParameters, TemplateArgs, NumTemplateArgs);
  } else {
    mangleNestedName(TD, TemplateArgs, NumTemplateArgs);
  }
}

void CXXNameMangler::mangleUnscopedName(const NamedDecl *ND) {
  //  <unscoped-name> ::= <unqualified-name>
  //                  ::= St <unqualified-name>   # ::std::

  if (isStdNamespace(IgnoreLinkageSpecDecls(getEffectiveDeclContext(ND))))
    Out << "St";

  mangleUnqualifiedName(ND);
}

void CXXNameMangler::mangleUnscopedTemplateName(const TemplateDecl *ND) {
  //     <unscoped-template-name> ::= <unscoped-name>
  //                              ::= <substitution>
  if (mangleSubstitution(ND))
    return;

  // <template-template-param> ::= <template-param>
  if (const TemplateTemplateParmDecl *TTP
                                     = dyn_cast<TemplateTemplateParmDecl>(ND)) {
    mangleTemplateParameter(TTP->getIndex());
    return;
  }

  mangleUnscopedName(ND->getTemplatedDecl());
  addSubstitution(ND);
}

void CXXNameMangler::mangleUnscopedTemplateName(TemplateName Template) {
  //     <unscoped-template-name> ::= <unscoped-name>
  //                              ::= <substitution>
  if (TemplateDecl *TD = Template.getAsTemplateDecl())
    return mangleUnscopedTemplateName(TD);
  
  if (mangleSubstitution(Template))
    return;

  DependentTemplateName *Dependent = Template.getAsDependentTemplateName();
  assert(Dependent && "Not a dependent template name?");
  if (const IdentifierInfo *Id = Dependent->getIdentifier())
    mangleSourceName(Id);
  else
    mangleOperatorName(Dependent->getOperator(), UnknownArity);
  
  addSubstitution(Template);
}

void CXXNameMangler::mangleFloat(const llvm::APFloat &f) {
  // ABI:
  //   Floating-point literals are encoded using a fixed-length
  //   lowercase hexadecimal string corresponding to the internal
  //   representation (IEEE on Itanium), high-order bytes first,
  //   without leading zeroes. For example: "Lf bf800000 E" is -1.0f
  //   on Itanium.
  // The 'without leading zeroes' thing seems to be an editorial
  // mistake; see the discussion on cxx-abi-dev beginning on
  // 2012-01-16.

  // Our requirements here are just barely wierd enough to justify
  // using a custom algorithm instead of post-processing APInt::toString().

  llvm::APInt valueBits = f.bitcastToAPInt();
  unsigned numCharacters = (valueBits.getBitWidth() + 3) / 4;
  assert(numCharacters != 0);

  // Allocate a buffer of the right number of characters.
  llvm::SmallVector<char, 20> buffer;
  buffer.set_size(numCharacters);

  // Fill the buffer left-to-right.
  for (unsigned stringIndex = 0; stringIndex != numCharacters; ++stringIndex) {
    // The bit-index of the next hex digit.
    unsigned digitBitIndex = 4 * (numCharacters - stringIndex - 1);

    // Project out 4 bits starting at 'digitIndex'.
    llvm::integerPart hexDigit
      = valueBits.getRawData()[digitBitIndex / llvm::integerPartWidth];
    hexDigit >>= (digitBitIndex % llvm::integerPartWidth);
    hexDigit &= 0xF;

    // Map that over to a lowercase hex digit.
    static const char charForHex[16] = {
      '0', '1', '2', '3', '4', '5', '6', '7',
      '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
    };
    buffer[stringIndex] = charForHex[hexDigit];
  }

  Out.write(buffer.data(), numCharacters);
}

void CXXNameMangler::mangleNumber(const llvm::APSInt &Value) {
  if (Value.isSigned() && Value.isNegative()) {
    Out << 'n';
    Value.abs().print(Out, true);
  } else
    Value.print(Out, Value.isSigned());
}

void CXXNameMangler::mangleNumber(int64_t Number) {
  //  <number> ::= [n] <non-negative decimal integer>
  if (Number < 0) {
    Out << 'n';
    Number = -Number;
  }

  Out << Number;
}

void CXXNameMangler::mangleCallOffset(int64_t NonVirtual, int64_t Virtual) {
  //  <call-offset>  ::= h <nv-offset> _
  //                 ::= v <v-offset> _
  //  <nv-offset>    ::= <offset number>        # non-virtual base override
  //  <v-offset>     ::= <offset number> _ <virtual offset number>
  //                      # virtual base override, with vcall offset
  if (!Virtual) {
    Out << 'h';
    mangleNumber(NonVirtual);
    Out << '_';
    return;
  }

  Out << 'v';
  mangleNumber(NonVirtual);
  Out << '_';
  mangleNumber(Virtual);
  Out << '_';
}

void CXXNameMangler::manglePrefix(QualType type) {
  if (const TemplateSpecializationType *TST =
        type->getAs<TemplateSpecializationType>()) {
    if (!mangleSubstitution(QualType(TST, 0))) {
      mangleTemplatePrefix(TST->getTemplateName());
        
      // FIXME: GCC does not appear to mangle the template arguments when
      // the template in question is a dependent template name. Should we
      // emulate that badness?
      mangleTemplateArgs(TST->getTemplateName(), TST->getArgs(),
                         TST->getNumArgs());
      addSubstitution(QualType(TST, 0));
    }
  } else if (const DependentTemplateSpecializationType *DTST
               = type->getAs<DependentTemplateSpecializationType>()) {
    TemplateName Template
      = getASTContext().getDependentTemplateName(DTST->getQualifier(), 
                                                 DTST->getIdentifier());
    mangleTemplatePrefix(Template);

    // FIXME: GCC does not appear to mangle the template arguments when
    // the template in question is a dependent template name. Should we
    // emulate that badness?
    mangleTemplateArgs(Template, DTST->getArgs(), DTST->getNumArgs());
  } else {
    // We use the QualType mangle type variant here because it handles
    // substitutions.
    mangleType(type);
  }
}

/// Mangle everything prior to the base-unresolved-name in an unresolved-name.
///
/// \param firstQualifierLookup - the entity found by unqualified lookup
///   for the first name in the qualifier, if this is for a member expression
/// \param recursive - true if this is being called recursively,
///   i.e. if there is more prefix "to the right".
void CXXNameMangler::mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
                                            NamedDecl *firstQualifierLookup,
                                            bool recursive) {

  // x, ::x
  // <unresolved-name> ::= [gs] <base-unresolved-name>

  // T::x / decltype(p)::x
  // <unresolved-name> ::= sr <unresolved-type> <base-unresolved-name>

  // T::N::x /decltype(p)::N::x
  // <unresolved-name> ::= srN <unresolved-type> <unresolved-qualifier-level>+ E
  //                       <base-unresolved-name>

  // A::x, N::y, A<T>::z; "gs" means leading "::"
  // <unresolved-name> ::= [gs] sr <unresolved-qualifier-level>+ E
  //                       <base-unresolved-name>

  switch (qualifier->getKind()) {
  case NestedNameSpecifier::Global:
    Out << "gs";

    // We want an 'sr' unless this is the entire NNS.
    if (recursive)
      Out << "sr";

    // We never want an 'E' here.
    return;

  case NestedNameSpecifier::Namespace:
    if (qualifier->getPrefix())
      mangleUnresolvedPrefix(qualifier->getPrefix(), firstQualifierLookup,
                             /*recursive*/ true);
    else
      Out << "sr";
    mangleSourceName(qualifier->getAsNamespace()->getIdentifier());
    break;
  case NestedNameSpecifier::NamespaceAlias:
    if (qualifier->getPrefix())
      mangleUnresolvedPrefix(qualifier->getPrefix(), firstQualifierLookup,
                             /*recursive*/ true);
    else
      Out << "sr";
    mangleSourceName(qualifier->getAsNamespaceAlias()->getIdentifier());
    break;

  case NestedNameSpecifier::TypeSpec:
  case NestedNameSpecifier::TypeSpecWithTemplate: {
    const Type *type = qualifier->getAsType();

    // We only want to use an unresolved-type encoding if this is one of:
    //   - a decltype
    //   - a template type parameter
    //   - a template template parameter with arguments
    // In all of these cases, we should have no prefix.
    if (qualifier->getPrefix()) {
      mangleUnresolvedPrefix(qualifier->getPrefix(), firstQualifierLookup,
                             /*recursive*/ true);
    } else {
      // Otherwise, all the cases want this.
      Out << "sr";
    }

    // Only certain other types are valid as prefixes;  enumerate them.
    switch (type->getTypeClass()) {
    case Type::Builtin:
    case Type::Complex:
    case Type::Pointer:
    case Type::BlockPointer:
    case Type::LValueReference:
    case Type::RValueReference:
    case Type::MemberPointer:
    case Type::ConstantArray:
    case Type::IncompleteArray:
    case Type::VariableArray:
    case Type::DependentSizedArray:
    case Type::DependentSizedExtVector:
    case Type::Vector:
    case Type::ExtVector:
    case Type::FunctionProto:
    case Type::FunctionNoProto:
    case Type::Enum:
    case Type::Paren:
    case Type::Elaborated:
    case Type::Attributed:
    case Type::Auto:
    case Type::PackExpansion:
    case Type::ObjCObject:
    case Type::ObjCInterface:
    case Type::ObjCObjectPointer:
    case Type::Atomic:
      llvm_unreachable("type is illegal as a nested name specifier");

    case Type::SubstTemplateTypeParmPack:
      // FIXME: not clear how to mangle this!
      // template <class T...> class A {
      //   template <class U...> void foo(decltype(T::foo(U())) x...);
      // };
      Out << "_SUBSTPACK_";
      break;

    // <unresolved-type> ::= <template-param>
    //                   ::= <decltype>
    //                   ::= <template-template-param> <template-args>
    // (this last is not official yet)
    case Type::TypeOfExpr:
    case Type::TypeOf:
    case Type::Decltype:
    case Type::TemplateTypeParm:
    case Type::UnaryTransform:
    case Type::SubstTemplateTypeParm:
    unresolvedType:
      assert(!qualifier->getPrefix());

      // We only get here recursively if we're followed by identifiers.
      if (recursive) Out << 'N';

      // This seems to do everything we want.  It's not really
      // sanctioned for a substituted template parameter, though.
      mangleType(QualType(type, 0));

      // We never want to print 'E' directly after an unresolved-type,
      // so we return directly.
      return;

    case Type::Typedef:
      mangleSourceName(cast<TypedefType>(type)->getDecl()->getIdentifier());
      break;

    case Type::UnresolvedUsing:
      mangleSourceName(cast<UnresolvedUsingType>(type)->getDecl()
                         ->getIdentifier());
      break;

    case Type::Record:
      mangleSourceName(cast<RecordType>(type)->getDecl()->getIdentifier());
      break;

    case Type::TemplateSpecialization: {
      const TemplateSpecializationType *tst
        = cast<TemplateSpecializationType>(type);
      TemplateName name = tst->getTemplateName();
      switch (name.getKind()) {
      case TemplateName::Template:
      case TemplateName::QualifiedTemplate: {
        TemplateDecl *temp = name.getAsTemplateDecl();

        // If the base is a template template parameter, this is an
        // unresolved type.
        assert(temp && "no template for template specialization type");
        if (isa<TemplateTemplateParmDecl>(temp)) goto unresolvedType;

        mangleSourceName(temp->getIdentifier());
        break;
      }

      case TemplateName::OverloadedTemplate:
      case TemplateName::DependentTemplate:
        llvm_unreachable("invalid base for a template specialization type");

      case TemplateName::SubstTemplateTemplateParm: {
        SubstTemplateTemplateParmStorage *subst
          = name.getAsSubstTemplateTemplateParm();
        mangleExistingSubstitution(subst->getReplacement());
        break;
      }

      case TemplateName::SubstTemplateTemplateParmPack: {
        // FIXME: not clear how to mangle this!
        // template <template <class U> class T...> class A {
        //   template <class U...> void foo(decltype(T<U>::foo) x...);
        // };
        Out << "_SUBSTPACK_";
        break;
      }
      }

      mangleUnresolvedTemplateArgs(tst->getArgs(), tst->getNumArgs());
      break;
    }

    case Type::InjectedClassName:
      mangleSourceName(cast<InjectedClassNameType>(type)->getDecl()
                         ->getIdentifier());
      break;

    case Type::DependentName:
      mangleSourceName(cast<DependentNameType>(type)->getIdentifier());
      break;

    case Type::DependentTemplateSpecialization: {
      const DependentTemplateSpecializationType *tst
        = cast<DependentTemplateSpecializationType>(type);
      mangleSourceName(tst->getIdentifier());
      mangleUnresolvedTemplateArgs(tst->getArgs(), tst->getNumArgs());
      break;
    }
    }
    break;
  }

  case NestedNameSpecifier::Identifier:
    // Member expressions can have these without prefixes.
    if (qualifier->getPrefix()) {
      mangleUnresolvedPrefix(qualifier->getPrefix(), firstQualifierLookup,
                             /*recursive*/ true);
    } else if (firstQualifierLookup) {

      // Try to make a proper qualifier out of the lookup result, and
      // then just recurse on that.
      NestedNameSpecifier *newQualifier;
      if (TypeDecl *typeDecl = dyn_cast<TypeDecl>(firstQualifierLookup)) {
        QualType type = getASTContext().getTypeDeclType(typeDecl);

        // Pretend we had a different nested name specifier.
        newQualifier = NestedNameSpecifier::Create(getASTContext(),
                                                   /*prefix*/ 0,
                                                   /*template*/ false,
                                                   type.getTypePtr());
      } else if (NamespaceDecl *nspace =
                   dyn_cast<NamespaceDecl>(firstQualifierLookup)) {
        newQualifier = NestedNameSpecifier::Create(getASTContext(),
                                                   /*prefix*/ 0,
                                                   nspace);
      } else if (NamespaceAliasDecl *alias =
                   dyn_cast<NamespaceAliasDecl>(firstQualifierLookup)) {
        newQualifier = NestedNameSpecifier::Create(getASTContext(),
                                                   /*prefix*/ 0,
                                                   alias);
      } else {
        // No sensible mangling to do here.
        newQualifier = 0;
      }

      if (newQualifier)
        return mangleUnresolvedPrefix(newQualifier, /*lookup*/ 0, recursive);

    } else {
      Out << "sr";
    }

    mangleSourceName(qualifier->getAsIdentifier());
    break;
  }

  // If this was the innermost part of the NNS, and we fell out to
  // here, append an 'E'.
  if (!recursive)
    Out << 'E';
}

/// Mangle an unresolved-name, which is generally used for names which
/// weren't resolved to specific entities.
void CXXNameMangler::mangleUnresolvedName(NestedNameSpecifier *qualifier,
                                          NamedDecl *firstQualifierLookup,
                                          DeclarationName name,
                                          unsigned knownArity) {
  if (qualifier) mangleUnresolvedPrefix(qualifier, firstQualifierLookup);
  mangleUnqualifiedName(0, name, knownArity);
}

static const FieldDecl *FindFirstNamedDataMember(const RecordDecl *RD) {
  assert(RD->isAnonymousStructOrUnion() &&
         "Expected anonymous struct or union!");
  
  for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
       I != E; ++I) {
    const FieldDecl *FD = *I;
    
    if (FD->getIdentifier())
      return FD;
    
    if (const RecordType *RT = FD->getType()->getAs<RecordType>()) {
      if (const FieldDecl *NamedDataMember = 
          FindFirstNamedDataMember(RT->getDecl()))
        return NamedDataMember;
    }
  }

  // We didn't find a named data member.
  return 0;
}

void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
                                           DeclarationName Name,
                                           unsigned KnownArity) {
  //  <unqualified-name> ::= <operator-name>
  //                     ::= <ctor-dtor-name>
  //                     ::= <source-name>
  switch (Name.getNameKind()) {
  case DeclarationName::Identifier: {
    if (const IdentifierInfo *II = Name.getAsIdentifierInfo()) {
      // We must avoid conflicts between internally- and externally-
      // linked variable and function declaration names in the same TU:
      //   void test() { extern void foo(); }
      //   static void foo();
      // This naming convention is the same as that followed by GCC,
      // though it shouldn't actually matter.
      if (ND && ND->getLinkage() == InternalLinkage &&
          getEffectiveDeclContext(ND)->isFileContext())
        Out << 'L';

      mangleSourceName(II);
      break;
    }

    // Otherwise, an anonymous entity.  We must have a declaration.
    assert(ND && "mangling empty name without declaration");

    if (const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(ND)) {
      if (NS->isAnonymousNamespace()) {
        // This is how gcc mangles these names.
        Out << "12_GLOBAL__N_1";
        break;
      }
    }

    if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
      // We must have an anonymous union or struct declaration.
      const RecordDecl *RD = 
        cast<RecordDecl>(VD->getType()->getAs<RecordType>()->getDecl());
      
      // Itanium C++ ABI 5.1.2:
      //
      //   For the purposes of mangling, the name of an anonymous union is
      //   considered to be the name of the first named data member found by a
      //   pre-order, depth-first, declaration-order walk of the data members of
      //   the anonymous union. If there is no such data member (i.e., if all of
      //   the data members in the union are unnamed), then there is no way for
      //   a program to refer to the anonymous union, and there is therefore no
      //   need to mangle its name.
      const FieldDecl *FD = FindFirstNamedDataMember(RD);

      // It's actually possible for various reasons for us to get here
      // with an empty anonymous struct / union.  Fortunately, it
      // doesn't really matter what name we generate.
      if (!FD) break;
      assert(FD->getIdentifier() && "Data member name isn't an identifier!");
      
      mangleSourceName(FD->getIdentifier());
      break;
    }
    
    // We must have an anonymous struct.
    const TagDecl *TD = cast<TagDecl>(ND);
    if (const TypedefNameDecl *D = TD->getTypedefNameForAnonDecl()) {
      assert(TD->getDeclContext() == D->getDeclContext() &&
             "Typedef should not be in another decl context!");
      assert(D->getDeclName().getAsIdentifierInfo() &&
             "Typedef was not named!");
      mangleSourceName(D->getDeclName().getAsIdentifierInfo());
      break;
    }

    // <unnamed-type-name> ::= <closure-type-name>
    // 
    // <closure-type-name> ::= Ul <lambda-sig> E [ <nonnegative number> ] _
    // <lambda-sig> ::= <parameter-type>+   # Parameter types or 'v' for 'void'.
    if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(TD)) {
      if (Record->isLambda() && Record->getLambdaManglingNumber()) {
        mangleLambda(Record);
        break;
      }
    }
        
    // Get a unique id for the anonymous struct.
    uint64_t AnonStructId = Context.getAnonymousStructId(TD);

    // Mangle it as a source name in the form
    // [n] $_<id>
    // where n is the length of the string.
    SmallString<8> Str;
    Str += "$_";
    Str += llvm::utostr(AnonStructId);

    Out << Str.size();
    Out << Str.str();
    break;
  }

  case DeclarationName::ObjCZeroArgSelector:
  case DeclarationName::ObjCOneArgSelector:
  case DeclarationName::ObjCMultiArgSelector:
    llvm_unreachable("Can't mangle Objective-C selector names here!");

  case DeclarationName::CXXConstructorName:
    if (ND == Structor)
      // If the named decl is the C++ constructor we're mangling, use the type
      // we were given.
      mangleCXXCtorType(static_cast<CXXCtorType>(StructorType));
    else
      // Otherwise, use the complete constructor name. This is relevant if a
      // class with a constructor is declared within a constructor.
      mangleCXXCtorType(Ctor_Complete);
    break;

  case DeclarationName::CXXDestructorName:
    if (ND == Structor)
      // If the named decl is the C++ destructor we're mangling, use the type we
      // were given.
      mangleCXXDtorType(static_cast<CXXDtorType>(StructorType));
    else
      // Otherwise, use the complete destructor name. This is relevant if a
      // class with a destructor is declared within a destructor.
      mangleCXXDtorType(Dtor_Complete);
    break;

  case DeclarationName::CXXConversionFunctionName:
    // <operator-name> ::= cv <type>    # (cast)
    Out << "cv";
    mangleType(Name.getCXXNameType());
    break;

  case DeclarationName::CXXOperatorName: {
    unsigned Arity;
    if (ND) {
      Arity = cast<FunctionDecl>(ND)->getNumParams();

      // If we have a C++ member function, we need to include the 'this' pointer.
      // FIXME: This does not make sense for operators that are static, but their
      // names stay the same regardless of the arity (operator new for instance).
      if (isa<CXXMethodDecl>(ND))
        Arity++;
    } else
      Arity = KnownArity;

    mangleOperatorName(Name.getCXXOverloadedOperator(), Arity);
    break;
  }

  case DeclarationName::CXXLiteralOperatorName:
    // FIXME: This mangling is not yet official.
    Out << "li";
    mangleSourceName(Name.getCXXLiteralIdentifier());
    break;

  case DeclarationName::CXXUsingDirective:
    llvm_unreachable("Can't mangle a using directive name!");
  }
}

void CXXNameMangler::mangleSourceName(const IdentifierInfo *II) {
  // <source-name> ::= <positive length number> <identifier>
  // <number> ::= [n] <non-negative decimal integer>
  // <identifier> ::= <unqualified source code identifier>
  Out << II->getLength() << II->getName();
}

void CXXNameMangler::mangleNestedName(const NamedDecl *ND,
                                      const DeclContext *DC,
                                      bool NoFunction) {
  // <nested-name> 
  //   ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E
  //   ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix> 
  //       <template-args> E

  Out << 'N';
  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(ND)) {
    mangleQualifiers(Qualifiers::fromCVRMask(Method->getTypeQualifiers()));
    mangleRefQualifier(Method->getRefQualifier());
  }
  
  // Check if we have a template.
  const TemplateArgumentList *TemplateArgs = 0;
  if (const TemplateDecl *TD = isTemplate(ND, TemplateArgs)) {
    mangleTemplatePrefix(TD);
    TemplateParameterList *TemplateParameters = TD->getTemplateParameters();
    mangleTemplateArgs(*TemplateParameters, *TemplateArgs);
  }
  else {
    manglePrefix(DC, NoFunction);
    mangleUnqualifiedName(ND);
  }

  Out << 'E';
}
void CXXNameMangler::mangleNestedName(const TemplateDecl *TD,
                                      const TemplateArgument *TemplateArgs,
                                      unsigned NumTemplateArgs) {
  // <nested-name> ::= N [<CV-qualifiers>] <template-prefix> <template-args> E

  Out << 'N';

  mangleTemplatePrefix(TD);
  TemplateParameterList *TemplateParameters = TD->getTemplateParameters();
  mangleTemplateArgs(*TemplateParameters, TemplateArgs, NumTemplateArgs);

  Out << 'E';
}

void CXXNameMangler::mangleLocalName(const NamedDecl *ND) {
  // <local-name> := Z <function encoding> E <entity name> [<discriminator>]
  //              := Z <function encoding> E s [<discriminator>]
  // <local-name> := Z <function encoding> E d [ <parameter number> ] 
  //                 _ <entity name>
  // <discriminator> := _ <non-negative number>
  const DeclContext *DC = getEffectiveDeclContext(ND);
  if (isa<ObjCMethodDecl>(DC) && isa<FunctionDecl>(ND)) {
    // Don't add objc method name mangling to locally declared function
    mangleUnqualifiedName(ND);
    return;
  }

  Out << 'Z';

  if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(DC)) {
   mangleObjCMethodName(MD);
  } else if (const CXXRecordDecl *RD = GetLocalClassDecl(ND)) {
    mangleFunctionEncoding(cast<FunctionDecl>(getEffectiveDeclContext(RD)));
    Out << 'E';

    // The parameter number is omitted for the last parameter, 0 for the 
    // second-to-last parameter, 1 for the third-to-last parameter, etc. The 
    // <entity name> will of course contain a <closure-type-name>: Its 
    // numbering will be local to the particular argument in which it appears
    // -- other default arguments do not affect its encoding.
    bool SkipDiscriminator = false;
    if (RD->isLambda()) {
      if (const ParmVarDecl *Parm
                 = dyn_cast_or_null<ParmVarDecl>(RD->getLambdaContextDecl())) {
        if (const FunctionDecl *Func
              = dyn_cast<FunctionDecl>(Parm->getDeclContext())) {
          Out << 'd';
          unsigned Num = Func->getNumParams() - Parm->getFunctionScopeIndex();
          if (Num > 1)
            mangleNumber(Num - 2);
          Out << '_';
          SkipDiscriminator = true;
        }
      }
    }
    
    // Mangle the name relative to the closest enclosing function.
    if (ND == RD) // equality ok because RD derived from ND above
      mangleUnqualifiedName(ND);
    else
      mangleNestedName(ND, DC, true /*NoFunction*/);

    if (!SkipDiscriminator) {
      unsigned disc;
      if (Context.getNextDiscriminator(RD, disc)) {
        if (disc < 10)
          Out << '_' << disc;
        else
          Out << "__" << disc << '_';
      }
    }
    
    return;
  }
  else
    mangleFunctionEncoding(cast<FunctionDecl>(DC));

  Out << 'E';
  mangleUnqualifiedName(ND);
}

void CXXNameMangler::mangleLambda(const CXXRecordDecl *Lambda) {
  // If the context of a closure type is an initializer for a class member 
  // (static or nonstatic), it is encoded in a qualified name with a final 
  // <prefix> of the form:
  //
  //   <data-member-prefix> := <member source-name> M
  //
  // Technically, the data-member-prefix is part of the <prefix>. However,
  // since a closure type will always be mangled with a prefix, it's easier
  // to emit that last part of the prefix here.
  if (Decl *Context = Lambda->getLambdaContextDecl()) {
    if ((isa<VarDecl>(Context) || isa<FieldDecl>(Context)) &&
        Context->getDeclContext()->isRecord()) {
      if (const IdentifierInfo *Name
            = cast<NamedDecl>(Context)->getIdentifier()) {
        mangleSourceName(Name);
        Out << 'M';            
      }
    }
  }

  Out << "Ul";
  DeclarationName Name
    = getASTContext().DeclarationNames.getCXXOperatorName(OO_Call);
  const FunctionProtoType *Proto
    = cast<CXXMethodDecl>(*Lambda->lookup(Name).first)->getType()->
        getAs<FunctionProtoType>();
  mangleBareFunctionType(Proto, /*MangleReturnType=*/false);        
  Out << "E";
  
  // The number is omitted for the first closure type with a given 
  // <lambda-sig> in a given context; it is n-2 for the nth closure type 
  // (in lexical order) with that same <lambda-sig> and context.
  //
  // The AST keeps track of the number for us.
  unsigned Number = Lambda->getLambdaManglingNumber();
  assert(Number > 0 && "Lambda should be mangled as an unnamed class");
  if (Number > 1)
    mangleNumber(Number - 2);
  Out << '_';  
}

void CXXNameMangler::manglePrefix(NestedNameSpecifier *qualifier) {
  switch (qualifier->getKind()) {
  case NestedNameSpecifier::Global:
    // nothing
    return;

  case NestedNameSpecifier::Namespace:
    mangleName(qualifier->getAsNamespace());
    return;

  case NestedNameSpecifier::NamespaceAlias:
    mangleName(qualifier->getAsNamespaceAlias()->getNamespace());
    return;

  case NestedNameSpecifier::TypeSpec:
  case NestedNameSpecifier::TypeSpecWithTemplate:
    manglePrefix(QualType(qualifier->getAsType(), 0));
    return;

  case NestedNameSpecifier::Identifier:
    // Member expressions can have these without prefixes, but that
    // should end up in mangleUnresolvedPrefix instead.
    assert(qualifier->getPrefix());
    manglePrefix(qualifier->getPrefix());

    mangleSourceName(qualifier->getAsIdentifier());
    return;
  }

  llvm_unreachable("unexpected nested name specifier");
}

void CXXNameMangler::manglePrefix(const DeclContext *DC, bool NoFunction) {
  //  <prefix> ::= <prefix> <unqualified-name>
  //           ::= <template-prefix> <template-args>
  //           ::= <template-param>
  //           ::= # empty
  //           ::= <substitution>

  DC = IgnoreLinkageSpecDecls(DC);

  if (DC->isTranslationUnit())
    return;

  if (const BlockDecl *Block = dyn_cast<BlockDecl>(DC)) {
    manglePrefix(getEffectiveParentContext(DC), NoFunction);    
    SmallString<64> Name;
    llvm::raw_svector_ostream NameStream(Name);
    Context.mangleBlock(Block, NameStream);
    NameStream.flush();
    Out << Name.size() << Name;
    return;
  }
  
  const NamedDecl *ND = cast<NamedDecl>(DC);  
  if (mangleSubstitution(ND))
    return;
  
  // Check if we have a template.
  const TemplateArgumentList *TemplateArgs = 0;
  if (const TemplateDecl *TD = isTemplate(ND, TemplateArgs)) {
    mangleTemplatePrefix(TD);
    TemplateParameterList *TemplateParameters = TD->getTemplateParameters();
    mangleTemplateArgs(*TemplateParameters, *TemplateArgs);
  }
  else if(NoFunction && (isa<FunctionDecl>(ND) || isa<ObjCMethodDecl>(ND)))
    return;
  else if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(ND))
    mangleObjCMethodName(Method);
  else {
    manglePrefix(getEffectiveDeclContext(ND), NoFunction);
    mangleUnqualifiedName(ND);
  }

  addSubstitution(ND);
}

void CXXNameMangler::mangleTemplatePrefix(TemplateName Template) {
  // <template-prefix> ::= <prefix> <template unqualified-name>
  //                   ::= <template-param>
  //                   ::= <substitution>
  if (TemplateDecl *TD = Template.getAsTemplateDecl())
    return mangleTemplatePrefix(TD);

  if (QualifiedTemplateName *Qualified = Template.getAsQualifiedTemplateName())
    manglePrefix(Qualified->getQualifier());
  
  if (OverloadedTemplateStorage *Overloaded
                                      = Template.getAsOverloadedTemplate()) {
    mangleUnqualifiedName(0, (*Overloaded->begin())->getDeclName(), 
                          UnknownArity);
    return;
  }
   
  DependentTemplateName *Dependent = Template.getAsDependentTemplateName();
  assert(Dependent && "Unknown template name kind?");
  manglePrefix(Dependent->getQualifier());
  mangleUnscopedTemplateName(Template);
}

void CXXNameMangler::mangleTemplatePrefix(const TemplateDecl *ND) {
  // <template-prefix> ::= <prefix> <template unqualified-name>
  //                   ::= <template-param>
  //                   ::= <substitution>
  // <template-template-param> ::= <template-param>
  //                               <substitution>

  if (mangleSubstitution(ND))
    return;

  // <template-template-param> ::= <template-param>
  if (const TemplateTemplateParmDecl *TTP
                                     = dyn_cast<TemplateTemplateParmDecl>(ND)) {
    mangleTemplateParameter(TTP->getIndex());
    return;
  }

  manglePrefix(getEffectiveDeclContext(ND));
  mangleUnqualifiedName(ND->getTemplatedDecl());
  addSubstitution(ND);
}

/// Mangles a template name under the production <type>.  Required for
/// template template arguments.
///   <type> ::= <class-enum-type>
///          ::= <template-param>
///          ::= <substitution>
void CXXNameMangler::mangleType(TemplateName TN) {
  if (mangleSubstitution(TN))
    return;
      
  TemplateDecl *TD = 0;

  switch (TN.getKind()) {
  case TemplateName::QualifiedTemplate:
    TD = TN.getAsQualifiedTemplateName()->getTemplateDecl();
    goto HaveDecl;

  case TemplateName::Template:
    TD = TN.getAsTemplateDecl();
    goto HaveDecl;

  HaveDecl:
    if (isa<TemplateTemplateParmDecl>(TD))
      mangleTemplateParameter(cast<TemplateTemplateParmDecl>(TD)->getIndex());
    else
      mangleName(TD);
    break;

  case TemplateName::OverloadedTemplate:
    llvm_unreachable("can't mangle an overloaded template name as a <type>");

  case TemplateName::DependentTemplate: {
    const DependentTemplateName *Dependent = TN.getAsDependentTemplateName();
    assert(Dependent->isIdentifier());

    // <class-enum-type> ::= <name>
    // <name> ::= <nested-name>
    mangleUnresolvedPrefix(Dependent->getQualifier(), 0);
    mangleSourceName(Dependent->getIdentifier());
    break;
  }

  case TemplateName::SubstTemplateTemplateParm: {
    // Substituted template parameters are mangled as the substituted
    // template.  This will check for the substitution twice, which is
    // fine, but we have to return early so that we don't try to *add*
    // the substitution twice.
    SubstTemplateTemplateParmStorage *subst
      = TN.getAsSubstTemplateTemplateParm();
    mangleType(subst->getReplacement());
    return;
  }

  case TemplateName::SubstTemplateTemplateParmPack: {
    // FIXME: not clear how to mangle this!
    // template <template <class> class T...> class A {
    //   template <template <class> class U...> void foo(B<T,U> x...);
    // };
    Out << "_SUBSTPACK_";
    break;
  }
  }

  addSubstitution(TN);
}

void
CXXNameMangler::mangleOperatorName(OverloadedOperatorKind OO, unsigned Arity) {
  switch (OO) {
  // <operator-name> ::= nw     # new
  case OO_New: Out << "nw"; break;
  //              ::= na        # new[]
  case OO_Array_New: Out << "na"; break;
  //              ::= dl        # delete
  case OO_Delete: Out << "dl"; break;
  //              ::= da        # delete[]
  case OO_Array_Delete: Out << "da"; break;
  //              ::= ps        # + (unary)
  //              ::= pl        # + (binary or unknown)
  case OO_Plus:
    Out << (Arity == 1? "ps" : "pl"); break;
  //              ::= ng        # - (unary)
  //              ::= mi        # - (binary or unknown)
  case OO_Minus:
    Out << (Arity == 1? "ng" : "mi"); break;
  //              ::= ad        # & (unary)
  //              ::= an        # & (binary or unknown)
  case OO_Amp:
    Out << (Arity == 1? "ad" : "an"); break;
  //              ::= de        # * (unary)
  //              ::= ml        # * (binary or unknown)
  case OO_Star:
    // Use binary when unknown.
    Out << (Arity == 1? "de" : "ml"); break;
  //              ::= co        # ~
  case OO_Tilde: Out << "co"; break;
  //              ::= dv        # /
  case OO_Slash: Out << "dv"; break;
  //              ::= rm        # %
  case OO_Percent: Out << "rm"; break;
  //              ::= or        # |
  case OO_Pipe: Out << "or"; break;
  //              ::= eo        # ^
  case OO_Caret: Out << "eo"; break;
  //              ::= aS        # =
  case OO_Equal: Out << "aS"; break;
  //              ::= pL        # +=
  case OO_PlusEqual: Out << "pL"; break;
  //              ::= mI        # -=
  case OO_MinusEqual: Out << "mI"; break;
  //              ::= mL        # *=
  case OO_StarEqual: Out << "mL"; break;
  //              ::= dV        # /=
  case OO_SlashEqual: Out << "dV"; break;
  //              ::= rM        # %=
  case OO_PercentEqual: Out << "rM"; break;
  //              ::= aN        # &=
  case OO_AmpEqual: Out << "aN"; break;
  //              ::= oR        # |=
  case OO_PipeEqual: Out << "oR"; break;
  //              ::= eO        # ^=
  case OO_CaretEqual: Out << "eO"; break;
  //              ::= ls        # <<
  case OO_LessLess: Out << "ls"; break;
  //              ::= rs        # >>
  case OO_GreaterGreater: Out << "rs"; break;
  //              ::= lS        # <<=
  case OO_LessLessEqual: Out << "lS"; break;
  //              ::= rS        # >>=
  case OO_GreaterGreaterEqual: Out << "rS"; break;
  //              ::= eq        # ==
  case OO_EqualEqual: Out << "eq"; break;
  //              ::= ne        # !=
  case OO_ExclaimEqual: Out << "ne"; break;
  //              ::= lt        # <
  case OO_Less: Out << "lt"; break;
  //              ::= gt        # >
  case OO_Greater: Out << "gt"; break;
  //              ::= le        # <=
  case OO_LessEqual: Out << "le"; break;
  //              ::= ge        # >=
  case OO_GreaterEqual: Out << "ge"; break;
  //              ::= nt        # !
  case OO_Exclaim: Out << "nt"; break;
  //              ::= aa        # &&
  case OO_AmpAmp: Out << "aa"; break;
  //              ::= oo        # ||
  case OO_PipePipe: Out << "oo"; break;
  //              ::= pp        # ++
  case OO_PlusPlus: Out << "pp"; break;
  //              ::= mm        # --
  case OO_MinusMinus: Out << "mm"; break;
  //              ::= cm        # ,
  case OO_Comma: Out << "cm"; break;
  //              ::= pm        # ->*
  case OO_ArrowStar: Out << "pm"; break;
  //              ::= pt        # ->
  case OO_Arrow: Out << "pt"; break;
  //              ::= cl        # ()
  case OO_Call: Out << "cl"; break;
  //              ::= ix        # []
  case OO_Subscript: Out << "ix"; break;

  //              ::= qu        # ?
  // The conditional operator can't be overloaded, but we still handle it when
  // mangling expressions.
  case OO_Conditional: Out << "qu"; break;

  case OO_None:
  case NUM_OVERLOADED_OPERATORS:
    llvm_unreachable("Not an overloaded operator");
  }
}

void CXXNameMangler::mangleQualifiers(Qualifiers Quals) {
  // <CV-qualifiers> ::= [r] [V] [K]    # restrict (C99), volatile, const
  if (Quals.hasRestrict())
    Out << 'r';
  if (Quals.hasVolatile())
    Out << 'V';
  if (Quals.hasConst())
    Out << 'K';

  if (Quals.hasAddressSpace()) {
    // Extension:
    //
    //   <type> ::= U <address-space-number>
    // 
    // where <address-space-number> is a source name consisting of 'AS' 
    // followed by the address space <number>.
    SmallString<64> ASString;
    ASString = "AS" + llvm::utostr_32(Quals.getAddressSpace());
    Out << 'U' << ASString.size() << ASString;
  }
  
  StringRef LifetimeName;
  switch (Quals.getObjCLifetime()) {
  // Objective-C ARC Extension:
  //
  //   <type> ::= U "__strong"
  //   <type> ::= U "__weak"
  //   <type> ::= U "__autoreleasing"
  case Qualifiers::OCL_None:
    break;
    
  case Qualifiers::OCL_Weak:
    LifetimeName = "__weak";
    break;
    
  case Qualifiers::OCL_Strong:
    LifetimeName = "__strong";
    break;
    
  case Qualifiers::OCL_Autoreleasing:
    LifetimeName = "__autoreleasing";
    break;
    
  case Qualifiers::OCL_ExplicitNone:
    // The __unsafe_unretained qualifier is *not* mangled, so that
    // __unsafe_unretained types in ARC produce the same manglings as the
    // equivalent (but, naturally, unqualified) types in non-ARC, providing
    // better ABI compatibility.
    //
    // It's safe to do this because unqualified 'id' won't show up
    // in any type signatures that need to be mangled.
    break;
  }
  if (!LifetimeName.empty())
    Out << 'U' << LifetimeName.size() << LifetimeName;
}

void CXXNameMangler::mangleRefQualifier(RefQualifierKind RefQualifier) {
  // <ref-qualifier> ::= R                # lvalue reference
  //                 ::= O                # rvalue-reference
  // Proposal to Itanium C++ ABI list on 1/26/11
  switch (RefQualifier) {
  case RQ_None:
    break;
      
  case RQ_LValue:
    Out << 'R';
    break;
      
  case RQ_RValue:
    Out << 'O';
    break;
  }
}

void CXXNameMangler::mangleObjCMethodName(const ObjCMethodDecl *MD) {
  Context.mangleObjCMethodName(MD, Out);
}

void CXXNameMangler::mangleType(QualType T) {
  // If our type is instantiation-dependent but not dependent, we mangle
  // it as it was written in the source, removing any top-level sugar. 
  // Otherwise, use the canonical type.
  //
  // FIXME: This is an approximation of the instantiation-dependent name 
  // mangling rules, since we should really be using the type as written and
  // augmented via semantic analysis (i.e., with implicit conversions and
  // default template arguments) for any instantiation-dependent type. 
  // Unfortunately, that requires several changes to our AST:
  //   - Instantiation-dependent TemplateSpecializationTypes will need to be 
  //     uniqued, so that we can handle substitutions properly
  //   - Default template arguments will need to be represented in the
  //     TemplateSpecializationType, since they need to be mangled even though
  //     they aren't written.
  //   - Conversions on non-type template arguments need to be expressed, since
  //     they can affect the mangling of sizeof/alignof.
  if (!T->isInstantiationDependentType() || T->isDependentType())
    T = T.getCanonicalType();
  else {
    // Desugar any types that are purely sugar.
    do {
      // Don't desugar through template specialization types that aren't
      // type aliases. We need to mangle the template arguments as written.
      if (const TemplateSpecializationType *TST 
                                      = dyn_cast<TemplateSpecializationType>(T))
        if (!TST->isTypeAlias())
          break;

      QualType Desugared 
        = T.getSingleStepDesugaredType(Context.getASTContext());
      if (Desugared == T)
        break;
      
      T = Desugared;
    } while (true);
  }
  SplitQualType split = T.split();
  Qualifiers quals = split.Quals;
  const Type *ty = split.Ty;

  bool isSubstitutable = quals || !isa<BuiltinType>(T);
  if (isSubstitutable && mangleSubstitution(T))
    return;

  // If we're mangling a qualified array type, push the qualifiers to
  // the element type.
  if (quals && isa<ArrayType>(T)) {
    ty = Context.getASTContext().getAsArrayType(T);
    quals = Qualifiers();

    // Note that we don't update T: we want to add the
    // substitution at the original type.
  }

  if (quals) {
    mangleQualifiers(quals);
    // Recurse:  even if the qualified type isn't yet substitutable,
    // the unqualified type might be.
    mangleType(QualType(ty, 0));
  } else {
    switch (ty->getTypeClass()) {
#define ABSTRACT_TYPE(CLASS, PARENT)
#define NON_CANONICAL_TYPE(CLASS, PARENT) \
    case Type::CLASS: \
      llvm_unreachable("can't mangle non-canonical type " #CLASS "Type"); \
      return;
#define TYPE(CLASS, PARENT) \
    case Type::CLASS: \
      mangleType(static_cast<const CLASS##Type*>(ty)); \
      break;
#include "clang/AST/TypeNodes.def"
    }
  }

  // Add the substitution.
  if (isSubstitutable)
    addSubstitution(T);
}

void CXXNameMangler::mangleNameOrStandardSubstitution(const NamedDecl *ND) {
  if (!mangleStandardSubstitution(ND))
    mangleName(ND);
}

void CXXNameMangler::mangleType(const BuiltinType *T) {
  //  <type>         ::= <builtin-type>
  //  <builtin-type> ::= v  # void
  //                 ::= w  # wchar_t
  //                 ::= b  # bool
  //                 ::= c  # char
  //                 ::= a  # signed char
  //                 ::= h  # unsigned char
  //                 ::= s  # short
  //                 ::= t  # unsigned short
  //                 ::= i  # int
  //                 ::= j  # unsigned int
  //                 ::= l  # long
  //                 ::= m  # unsigned long
  //                 ::= x  # long long, __int64
  //                 ::= y  # unsigned long long, __int64
  //                 ::= n  # __int128
  // UNSUPPORTED:    ::= o  # unsigned __int128
  //                 ::= f  # float
  //                 ::= d  # double
  //                 ::= e  # long double, __float80
  // UNSUPPORTED:    ::= g  # __float128
  // UNSUPPORTED:    ::= Dd # IEEE 754r decimal floating point (64 bits)
  // UNSUPPORTED:    ::= De # IEEE 754r decimal floating point (128 bits)
  // UNSUPPORTED:    ::= Df # IEEE 754r decimal floating point (32 bits)
  //                 ::= Dh # IEEE 754r half-precision floating point (16 bits)
  //                 ::= Di # char32_t
  //                 ::= Ds # char16_t
  //                 ::= Dn # std::nullptr_t (i.e., decltype(nullptr))
  //                 ::= u <source-name>    # vendor extended type
  switch (T->getKind()) {
  case BuiltinType::Void: Out << 'v'; break;
  case BuiltinType::Bool: Out << 'b'; break;
  case BuiltinType::Char_U: case BuiltinType::Char_S: Out << 'c'; break;
  case BuiltinType::UChar: Out << 'h'; break;
  case BuiltinType::UShort: Out << 't'; break;
  case BuiltinType::UInt: Out << 'j'; break;
  case BuiltinType::ULong: Out << 'm'; break;
  case BuiltinType::ULongLong: Out << 'y'; break;
  case BuiltinType::UInt128: Out << 'o'; break;
  case BuiltinType::SChar: Out << 'a'; break;
  case BuiltinType::WChar_S:
  case BuiltinType::WChar_U: Out << 'w'; break;
  case BuiltinType::Char16: Out << "Ds"; break;
  case BuiltinType::Char32: Out << "Di"; break;
  case BuiltinType::Short: Out << 's'; break;
  case BuiltinType::Int: Out << 'i'; break;
  case BuiltinType::Long: Out << 'l'; break;
  case BuiltinType::LongLong: Out << 'x'; break;
  case BuiltinType::Int128: Out << 'n'; break;
  case BuiltinType::Half: Out << "Dh"; break;
  case BuiltinType::Float: Out << 'f'; break;
  case BuiltinType::Double: Out << 'd'; break;
  case BuiltinType::LongDouble: Out << 'e'; break;
  case BuiltinType::NullPtr: Out << "Dn"; break;

#define BUILTIN_TYPE(Id, SingletonId)
#define PLACEHOLDER_TYPE(Id, SingletonId) \
  case BuiltinType::Id:
#include "clang/AST/BuiltinTypes.def"
  case BuiltinType::Dependent:
    llvm_unreachable("mangling a placeholder type");
  case BuiltinType::ObjCId: Out << "11objc_object"; break;
  case BuiltinType::ObjCClass: Out << "10objc_class"; break;
  case BuiltinType::ObjCSel: Out << "13objc_selector"; break;
  }
}

// <type>          ::= <function-type>
// <function-type> ::= F [Y] <bare-function-type> E
void CXXNameMangler::mangleType(const FunctionProtoType *T) {
  Out << 'F';
  // FIXME: We don't have enough information in the AST to produce the 'Y'
  // encoding for extern "C" function types.
  mangleBareFunctionType(T, /*MangleReturnType=*/true);
  Out << 'E';
}
void CXXNameMangler::mangleType(const FunctionNoProtoType *T) {
  llvm_unreachable("Can't mangle K&R function prototypes");
}
void CXXNameMangler::mangleBareFunctionType(const FunctionType *T,
                                            bool MangleReturnType) {
  // We should never be mangling something without a prototype.
  const FunctionProtoType *Proto = cast<FunctionProtoType>(T);

  // Record that we're in a function type.  See mangleFunctionParam
  // for details on what we're trying to achieve here.
  FunctionTypeDepthState saved = FunctionTypeDepth.push();

  // <bare-function-type> ::= <signature type>+
  if (MangleReturnType) {
    FunctionTypeDepth.enterResultType();
    mangleType(Proto->getResultType());
    FunctionTypeDepth.leaveResultType();
  }

  if (Proto->getNumArgs() == 0 && !Proto->isVariadic()) {
    //   <builtin-type> ::= v   # void
    Out << 'v';

    FunctionTypeDepth.pop(saved);
    return;
  }

  for (FunctionProtoType::arg_type_iterator Arg = Proto->arg_type_begin(),
                                         ArgEnd = Proto->arg_type_end();
       Arg != ArgEnd; ++Arg)
    mangleType(Context.getASTContext().getSignatureParameterType(*Arg));

  FunctionTypeDepth.pop(saved);

  // <builtin-type>      ::= z  # ellipsis
  if (Proto->isVariadic())
    Out << 'z';
}

// <type>            ::= <class-enum-type>
// <class-enum-type> ::= <name>
void CXXNameMangler::mangleType(const UnresolvedUsingType *T) {
  mangleName(T->getDecl());
}

// <type>            ::= <class-enum-type>
// <class-enum-type> ::= <name>
void CXXNameMangler::mangleType(const EnumType *T) {
  mangleType(static_cast<const TagType*>(T));
}
void CXXNameMangler::mangleType(const RecordType *T) {
  mangleType(static_cast<const TagType*>(T));
}
void CXXNameMangler::mangleType(const TagType *T) {
  mangleName(T->getDecl());
}

// <type>       ::= <array-type>
// <array-type> ::= A <positive dimension number> _ <element type>
//              ::= A [<dimension expression>] _ <element type>
void CXXNameMangler::mangleType(const ConstantArrayType *T) {
  Out << 'A' << T->getSize() << '_';
  mangleType(T->getElementType());
}
void CXXNameMangler::mangleType(const VariableArrayType *T) {
  Out << 'A';
  // decayed vla types (size 0) will just be skipped.
  if (T->getSizeExpr())
    mangleExpression(T->getSizeExpr());
  Out << '_';
  mangleType(T->getElementType());
}
void CXXNameMangler::mangleType(const DependentSizedArrayType *T) {
  Out << 'A';
  mangleExpression(T->getSizeExpr());
  Out << '_';
  mangleType(T->getElementType());
}
void CXXNameMangler::mangleType(const IncompleteArrayType *T) {
  Out << "A_";
  mangleType(T->getElementType());
}

// <type>                   ::= <pointer-to-member-type>
// <pointer-to-member-type> ::= M <class type> <member type>
void CXXNameMangler::mangleType(const MemberPointerType *T) {
  Out << 'M';
  mangleType(QualType(T->getClass(), 0));
  QualType PointeeType = T->getPointeeType();
  if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(PointeeType)) {
    mangleQualifiers(Qualifiers::fromCVRMask(FPT->getTypeQuals()));
    mangleRefQualifier(FPT->getRefQualifier());
    mangleType(FPT);
    
    // Itanium C++ ABI 5.1.8:
    //
    //   The type of a non-static member function is considered to be different,
    //   for the purposes of substitution, from the type of a namespace-scope or
    //   static member function whose type appears similar. The types of two
    //   non-static member functions are considered to be different, for the
    //   purposes of substitution, if the functions are members of different
    //   classes. In other words, for the purposes of substitution, the class of 
    //   which the function is a member is considered part of the type of 
    //   function.

    // We increment the SeqID here to emulate adding an entry to the
    // substitution table. We can't actually add it because we don't want this
    // particular function type to be substituted.
    ++SeqID;
  } else
    mangleType(PointeeType);
}

// <type>           ::= <template-param>
void CXXNameMangler::mangleType(const TemplateTypeParmType *T) {
  mangleTemplateParameter(T->getIndex());
}

// <type>           ::= <template-param>
void CXXNameMangler::mangleType(const SubstTemplateTypeParmPackType *T) {
  // FIXME: not clear how to mangle this!
  // template <class T...> class A {
  //   template <class U...> void foo(T(*)(U) x...);
  // };
  Out << "_SUBSTPACK_";
}

// <type> ::= P <type>   # pointer-to
void CXXNameMangler::mangleType(const PointerType *T) {
  Out << 'P';
  mangleType(T->getPointeeType());
}
void CXXNameMangler::mangleType(const ObjCObjectPointerType *T) {
  Out << 'P';
  mangleType(T->getPointeeType());
}

// <type> ::= R <type>   # reference-to
void CXXNameMangler::mangleType(const LValueReferenceType *T) {
  Out << 'R';
  mangleType(T->getPointeeType());
}

// <type> ::= O <type>   # rvalue reference-to (C++0x)
void CXXNameMangler::mangleType(const RValueReferenceType *T) {
  Out << 'O';
  mangleType(T->getPointeeType());
}

// <type> ::= C <type>   # complex pair (C 2000)
void CXXNameMangler::mangleType(const ComplexType *T) {
  Out << 'C';
  mangleType(T->getElementType());
}

// ARM's ABI for Neon vector types specifies that they should be mangled as
// if they are structs (to match ARM's initial implementation).  The
// vector type must be one of the special types predefined by ARM.
void CXXNameMangler::mangleNeonVectorType(const VectorType *T) {
  QualType EltType = T->getElementType();
  assert(EltType->isBuiltinType() && "Neon vector element not a BuiltinType");
  const char *EltName = 0;
  if (T->getVectorKind() == VectorType::NeonPolyVector) {
    switch (cast<BuiltinType>(EltType)->getKind()) {
    case BuiltinType::SChar:     EltName = "poly8_t"; break;
    case BuiltinType::Short:     EltName = "poly16_t"; break;
    default: llvm_unreachable("unexpected Neon polynomial vector element type");
    }
  } else {
    switch (cast<BuiltinType>(EltType)->getKind()) {
    case BuiltinType::SChar:     EltName = "int8_t"; break;
    case BuiltinType::UChar:     EltName = "uint8_t"; break;
    case BuiltinType::Short:     EltName = "int16_t"; break;
    case BuiltinType::UShort:    EltName = "uint16_t"; break;
    case BuiltinType::Int:       EltName = "int32_t"; break;
    case BuiltinType::UInt:      EltName = "uint32_t"; break;
    case BuiltinType::LongLong:  EltName = "int64_t"; break;
    case BuiltinType::ULongLong: EltName = "uint64_t"; break;
    case BuiltinType::Float:     EltName = "float32_t"; break;
    default: llvm_unreachable("unexpected Neon vector element type");
    }
  }
  const char *BaseName = 0;
  unsigned BitSize = (T->getNumElements() *
                      getASTContext().getTypeSize(EltType));
  if (BitSize == 64)
    BaseName = "__simd64_";
  else {
    assert(BitSize == 128 && "Neon vector type not 64 or 128 bits");
    BaseName = "__simd128_";
  }
  Out << strlen(BaseName) + strlen(EltName);
  Out << BaseName << EltName;
}

// GNU extension: vector types
// <type>                  ::= <vector-type>
// <vector-type>           ::= Dv <positive dimension number> _
//                                    <extended element type>
//                         ::= Dv [<dimension expression>] _ <element type>
// <extended element type> ::= <element type>
//                         ::= p # AltiVec vector pixel
void CXXNameMangler::mangleType(const VectorType *T) {
  if ((T->getVectorKind() == VectorType::NeonVector ||
       T->getVectorKind() == VectorType::NeonPolyVector)) {
    mangleNeonVectorType(T);
    return;
  }
  Out << "Dv" << T->getNumElements() << '_';
  if (T->getVectorKind() == VectorType::AltiVecPixel)
    Out << 'p';
  else if (T->getVectorKind() == VectorType::AltiVecBool)
    Out << 'b';
  else
    mangleType(T->getElementType());
}
void CXXNameMangler::mangleType(const ExtVectorType *T) {
  mangleType(static_cast<const VectorType*>(T));
}
void CXXNameMangler::mangleType(const DependentSizedExtVectorType *T) {
  Out << "Dv";
  mangleExpression(T->getSizeExpr());
  Out << '_';
  mangleType(T->getElementType());
}

void CXXNameMangler::mangleType(const PackExpansionType *T) {
  // <type>  ::= Dp <type>          # pack expansion (C++0x)
  Out << "Dp";
  mangleType(T->getPattern());
}

void CXXNameMangler::mangleType(const ObjCInterfaceType *T) {
  mangleSourceName(T->getDecl()->getIdentifier());
}

void CXXNameMangler::mangleType(const ObjCObjectType *T) {
  // We don't allow overloading by different protocol qualification,
  // so mangling them isn't necessary.
  mangleType(T->getBaseType());
}

void CXXNameMangler::mangleType(const BlockPointerType *T) {
  Out << "U13block_pointer";
  mangleType(T->getPointeeType());
}

void CXXNameMangler::mangleType(const InjectedClassNameType *T) {
  // Mangle injected class name types as if the user had written the
  // specialization out fully.  It may not actually be possible to see
  // this mangling, though.
  mangleType(T->getInjectedSpecializationType());
}

void CXXNameMangler::mangleType(const TemplateSpecializationType *T) {
  if (TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl()) {
    mangleName(TD, T->getArgs(), T->getNumArgs());
  } else {
    if (mangleSubstitution(QualType(T, 0)))
      return;
    
    mangleTemplatePrefix(T->getTemplateName());
    
    // FIXME: GCC does not appear to mangle the template arguments when
    // the template in question is a dependent template name. Should we
    // emulate that badness?
    mangleTemplateArgs(T->getTemplateName(), T->getArgs(), T->getNumArgs());
    addSubstitution(QualType(T, 0));
  }
}

void CXXNameMangler::mangleType(const DependentNameType *T) {
  // Typename types are always nested
  Out << 'N';
  manglePrefix(T->getQualifier());
  mangleSourceName(T->getIdentifier());    
  Out << 'E';
}

void CXXNameMangler::mangleType(const DependentTemplateSpecializationType *T) {
  // Dependently-scoped template types are nested if they have a prefix.
  Out << 'N';

  // TODO: avoid making this TemplateName.
  TemplateName Prefix =
    getASTContext().getDependentTemplateName(T->getQualifier(),
                                             T->getIdentifier());
  mangleTemplatePrefix(Prefix);

  // FIXME: GCC does not appear to mangle the template arguments when
  // the template in question is a dependent template name. Should we
  // emulate that badness?
  mangleTemplateArgs(Prefix, T->getArgs(), T->getNumArgs());    
  Out << 'E';
}

void CXXNameMangler::mangleType(const TypeOfType *T) {
  // FIXME: this is pretty unsatisfactory, but there isn't an obvious
  // "extension with parameters" mangling.
  Out << "u6typeof";
}

void CXXNameMangler::mangleType(const TypeOfExprType *T) {
  // FIXME: this is pretty unsatisfactory, but there isn't an obvious
  // "extension with parameters" mangling.
  Out << "u6typeof";
}

void CXXNameMangler::mangleType(const DecltypeType *T) {
  Expr *E = T->getUnderlyingExpr();

  // type ::= Dt <expression> E  # decltype of an id-expression
  //                             #   or class member access
  //      ::= DT <expression> E  # decltype of an expression

  // This purports to be an exhaustive list of id-expressions and
  // class member accesses.  Note that we do not ignore parentheses;
  // parentheses change the semantics of decltype for these
  // expressions (and cause the mangler to use the other form).
  if (isa<DeclRefExpr>(E) ||
      isa<MemberExpr>(E) ||
      isa<UnresolvedLookupExpr>(E) ||
      isa<DependentScopeDeclRefExpr>(E) ||
      isa<CXXDependentScopeMemberExpr>(E) ||
      isa<UnresolvedMemberExpr>(E))
    Out << "Dt";
  else
    Out << "DT";
  mangleExpression(E);
  Out << 'E';
}

void CXXNameMangler::mangleType(const UnaryTransformType *T) {
  // If this is dependent, we need to record that. If not, we simply
  // mangle it as the underlying type since they are equivalent.
  if (T->isDependentType()) {
    Out << 'U';
    
    switch (T->getUTTKind()) {
      case UnaryTransformType::EnumUnderlyingType:
        Out << "3eut";
        break;
    }
  }

  mangleType(T->getUnderlyingType());
}

void CXXNameMangler::mangleType(const AutoType *T) {
  QualType D = T->getDeducedType();
  // <builtin-type> ::= Da  # dependent auto
  if (D.isNull())
    Out << "Da";
  else
    mangleType(D);
}

void CXXNameMangler::mangleType(const AtomicType *T) {
  // <type> ::= U <source-name> <type>	# vendor extended type qualifier
  // (Until there's a standardized mangling...)
  Out << "U7_Atomic";
  mangleType(T->getValueType());
}

void CXXNameMangler::mangleIntegerLiteral(QualType T,
                                          const llvm::APSInt &Value) {
  //  <expr-primary> ::= L <type> <value number> E # integer literal
  Out << 'L';

  mangleType(T);
  if (T->isBooleanType()) {
    // Boolean values are encoded as 0/1.
    Out << (Value.getBoolValue() ? '1' : '0');
  } else {
    mangleNumber(Value);
  }
  Out << 'E';

}

/// Mangles a member expression.
void CXXNameMangler::mangleMemberExpr(const Expr *base,
                                      bool isArrow,
                                      NestedNameSpecifier *qualifier,
                                      NamedDecl *firstQualifierLookup,
                                      DeclarationName member,
                                      unsigned arity) {
  // <expression> ::= dt <expression> <unresolved-name>
  //              ::= pt <expression> <unresolved-name>
  if (base) {
    if (base->isImplicitCXXThis()) {
      // Note: GCC mangles member expressions to the implicit 'this' as
      // *this., whereas we represent them as this->. The Itanium C++ ABI
      // does not specify anything here, so we follow GCC.
      Out << "dtdefpT";
    } else {
      Out << (isArrow ? "pt" : "dt");
      mangleExpression(base);
    }
  }
  mangleUnresolvedName(qualifier, firstQualifierLookup, member, arity);
}

/// Look at the callee of the given call expression and determine if
/// it's a parenthesized id-expression which would have triggered ADL
/// otherwise.
static bool isParenthesizedADLCallee(const CallExpr *call) {
  const Expr *callee = call->getCallee();
  const Expr *fn = callee->IgnoreParens();

  // Must be parenthesized.  IgnoreParens() skips __extension__ nodes,
  // too, but for those to appear in the callee, it would have to be
  // parenthesized.
  if (callee == fn) return false;

  // Must be an unresolved lookup.
  const UnresolvedLookupExpr *lookup = dyn_cast<UnresolvedLookupExpr>(fn);
  if (!lookup) return false;

  assert(!lookup->requiresADL());

  // Must be an unqualified lookup.
  if (lookup->getQualifier()) return false;

  // Must not have found a class member.  Note that if one is a class
  // member, they're all class members.
  if (lookup->getNumDecls() > 0 &&
      (*lookup->decls_begin())->isCXXClassMember())
    return false;

  // Otherwise, ADL would have been triggered.
  return true;
}

void CXXNameMangler::mangleExpression(const Expr *E, unsigned Arity) {
  // <expression> ::= <unary operator-name> <expression>
  //              ::= <binary operator-name> <expression> <expression>
  //              ::= <trinary operator-name> <expression> <expression> <expression>
  //              ::= cv <type> expression           # conversion with one argument
  //              ::= cv <type> _ <expression>* E # conversion with a different number of arguments
  //              ::= st <type>                      # sizeof (a type)
  //              ::= at <type>                      # alignof (a type)
  //              ::= <template-param>
  //              ::= <function-param>
  //              ::= sr <type> <unqualified-name>                   # dependent name
  //              ::= sr <type> <unqualified-name> <template-args>   # dependent template-id
  //              ::= ds <expression> <expression>                   # expr.*expr
  //              ::= sZ <template-param>                            # size of a parameter pack
  //              ::= sZ <function-param>    # size of a function parameter pack
  //              ::= <expr-primary>
  // <expr-primary> ::= L <type> <value number> E    # integer literal
  //                ::= L <type <value float> E      # floating literal
  //                ::= L <mangled-name> E           # external name
  //                ::= fpT                          # 'this' expression
  QualType ImplicitlyConvertedToType;
  
recurse:
  switch (E->getStmtClass()) {
  case Expr::NoStmtClass:
#define ABSTRACT_STMT(Type)
#define EXPR(Type, Base)
#define STMT(Type, Base) \
  case Expr::Type##Class:
#include "clang/AST/StmtNodes.inc"
    // fallthrough

  // These all can only appear in local or variable-initialization
  // contexts and so should never appear in a mangling.
  case Expr::AddrLabelExprClass:
  case Expr::DesignatedInitExprClass:
  case Expr::ImplicitValueInitExprClass:
  case Expr::ParenListExprClass:
  case Expr::LambdaExprClass:
    llvm_unreachable("unexpected statement kind");

  // FIXME: invent manglings for all these.
  case Expr::BlockExprClass:
  case Expr::CXXPseudoDestructorExprClass:
  case Expr::ChooseExprClass:
  case Expr::CompoundLiteralExprClass:
  case Expr::ExtVectorElementExprClass:
  case Expr::GenericSelectionExprClass:
  case Expr::ObjCEncodeExprClass:
  case Expr::ObjCIsaExprClass:
  case Expr::ObjCIvarRefExprClass:
  case Expr::ObjCMessageExprClass:
  case Expr::ObjCPropertyRefExprClass:
  case Expr::ObjCProtocolExprClass:
  case Expr::ObjCSelectorExprClass:
  case Expr::ObjCStringLiteralClass:
  case Expr::ObjCNumericLiteralClass:
  case Expr::ObjCArrayLiteralClass:
  case Expr::ObjCDictionaryLiteralClass:
  case Expr::ObjCSubscriptRefExprClass:
  case Expr::ObjCIndirectCopyRestoreExprClass:
  case Expr::OffsetOfExprClass:
  case Expr::PredefinedExprClass:
  case Expr::ShuffleVectorExprClass:
  case Expr::StmtExprClass:
  case Expr::UnaryTypeTraitExprClass:
  case Expr::BinaryTypeTraitExprClass:
  case Expr::TypeTraitExprClass:
  case Expr::ArrayTypeTraitExprClass:
  case Expr::ExpressionTraitExprClass:
  case Expr::VAArgExprClass:
  case Expr::CXXUuidofExprClass:
  case Expr::CXXNoexceptExprClass:
  case Expr::CUDAKernelCallExprClass:
  case Expr::AsTypeExprClass:
  case Expr::PseudoObjectExprClass:
  case Expr::AtomicExprClass:
  {
    // As bad as this diagnostic is, it's better than crashing.
    DiagnosticsEngine &Diags = Context.getDiags();
    unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
                                     "cannot yet mangle expression type %0");
    Diags.Report(E->getExprLoc(), DiagID)
      << E->getStmtClassName() << E->getSourceRange();
    break;
  }

  // Even gcc-4.5 doesn't mangle this.
  case Expr::BinaryConditionalOperatorClass: {
    DiagnosticsEngine &Diags = Context.getDiags();
    unsigned DiagID =
      Diags.getCustomDiagID(DiagnosticsEngine::Error,
                "?: operator with omitted middle operand cannot be mangled");
    Diags.Report(E->getExprLoc(), DiagID)
      << E->getStmtClassName() << E->getSourceRange();
    break;
  }

  // These are used for internal purposes and cannot be meaningfully mangled.
  case Expr::OpaqueValueExprClass:
    llvm_unreachable("cannot mangle opaque value; mangling wrong thing?");

  case Expr::InitListExprClass: {
    // Proposal by Jason Merrill, 2012-01-03
    Out << "il";
    const InitListExpr *InitList = cast<InitListExpr>(E);
    for (unsigned i = 0, e = InitList->getNumInits(); i != e; ++i)
      mangleExpression(InitList->getInit(i));
    Out << "E";
    break;
  }

  case Expr::CXXDefaultArgExprClass:
    mangleExpression(cast<CXXDefaultArgExpr>(E)->getExpr(), Arity);
    break;

  case Expr::SubstNonTypeTemplateParmExprClass:
    mangleExpression(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(),
                     Arity);
    break;

  case Expr::UserDefinedLiteralClass:
    // We follow g++'s approach of mangling a UDL as a call to the literal
    // operator.
  case Expr::CXXMemberCallExprClass: // fallthrough
  case Expr::CallExprClass: {
    const CallExpr *CE = cast<CallExpr>(E);

    // <expression> ::= cp <simple-id> <expression>* E
    // We use this mangling only when the call would use ADL except
    // for being parenthesized.  Per discussion with David
    // Vandervoorde, 2011.04.25.
    if (isParenthesizedADLCallee(CE)) {
      Out << "cp";
      // The callee here is a parenthesized UnresolvedLookupExpr with
      // no qualifier and should always get mangled as a <simple-id>
      // anyway.

    // <expression> ::= cl <expression>* E
    } else {
      Out << "cl";
    }

    mangleExpression(CE->getCallee(), CE->getNumArgs());
    for (unsigned I = 0, N = CE->getNumArgs(); I != N; ++I)
      mangleExpression(CE->getArg(I));
    Out << 'E';
    break;
  }

  case Expr::CXXNewExprClass: {
    const CXXNewExpr *New = cast<CXXNewExpr>(E);
    if (New->isGlobalNew()) Out << "gs";
    Out << (New->isArray() ? "na" : "nw");
    for (CXXNewExpr::const_arg_iterator I = New->placement_arg_begin(),
           E = New->placement_arg_end(); I != E; ++I)
      mangleExpression(*I);
    Out << '_';
    mangleType(New->getAllocatedType());
    if (New->hasInitializer()) {
      // Proposal by Jason Merrill, 2012-01-03
      if (New->getInitializationStyle() == CXXNewExpr::ListInit)
        Out << "il";
      else
        Out << "pi";
      const Expr *Init = New->getInitializer();
      if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init)) {
        // Directly inline the initializers.
        for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
                                                  E = CCE->arg_end();
             I != E; ++I)
          mangleExpression(*I);
      } else if (const ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init)) {
        for (unsigned i = 0, e = PLE->getNumExprs(); i != e; ++i)
          mangleExpression(PLE->getExpr(i));
      } else if (New->getInitializationStyle() == CXXNewExpr::ListInit &&
                 isa<InitListExpr>(Init)) {
        // Only take InitListExprs apart for list-initialization.
        const InitListExpr *InitList = cast<InitListExpr>(Init);
        for (unsigned i = 0, e = InitList->getNumInits(); i != e; ++i)
          mangleExpression(InitList->getInit(i));
      } else
        mangleExpression(Init);
    }
    Out << 'E';
    break;
  }

  case Expr::MemberExprClass: {
    const MemberExpr *ME = cast<MemberExpr>(E);
    mangleMemberExpr(ME->getBase(), ME->isArrow(),
                     ME->getQualifier(), 0, ME->getMemberDecl()->getDeclName(),
                     Arity);
    break;
  }

  case Expr::UnresolvedMemberExprClass: {
    const UnresolvedMemberExpr *ME = cast<UnresolvedMemberExpr>(E);
    mangleMemberExpr(ME->getBase(), ME->isArrow(),
                     ME->getQualifier(), 0, ME->getMemberName(),
                     Arity);
    if (ME->hasExplicitTemplateArgs())
      mangleTemplateArgs(ME->getExplicitTemplateArgs());
    break;
  }

  case Expr::CXXDependentScopeMemberExprClass: {
    const CXXDependentScopeMemberExpr *ME
      = cast<CXXDependentScopeMemberExpr>(E);
    mangleMemberExpr(ME->getBase(), ME->isArrow(),
                     ME->getQualifier(), ME->getFirstQualifierFoundInScope(),
                     ME->getMember(), Arity);
    if (ME->hasExplicitTemplateArgs())
      mangleTemplateArgs(ME->getExplicitTemplateArgs());
    break;
  }

  case Expr::UnresolvedLookupExprClass: {
    const UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(E);
    mangleUnresolvedName(ULE->getQualifier(), 0, ULE->getName(), Arity);

    // All the <unresolved-name> productions end in a
    // base-unresolved-name, where <template-args> are just tacked
    // onto the end.
    if (ULE->hasExplicitTemplateArgs())
      mangleTemplateArgs(ULE->getExplicitTemplateArgs());
    break;
  }

  case Expr::CXXUnresolvedConstructExprClass: {
    const CXXUnresolvedConstructExpr *CE = cast<CXXUnresolvedConstructExpr>(E);
    unsigned N = CE->arg_size();

    Out << "cv";
    mangleType(CE->getType());
    if (N != 1) Out << '_';
    for (unsigned I = 0; I != N; ++I) mangleExpression(CE->getArg(I));
    if (N != 1) Out << 'E';
    break;
  }

  case Expr::CXXTemporaryObjectExprClass:
  case Expr::CXXConstructExprClass: {
    const CXXConstructExpr *CE = cast<CXXConstructExpr>(E);
    unsigned N = CE->getNumArgs();

    // Proposal by Jason Merrill, 2012-01-03
    if (CE->isListInitialization())
      Out << "tl";
    else
      Out << "cv";
    mangleType(CE->getType());
    if (N != 1) Out << '_';
    for (unsigned I = 0; I != N; ++I) mangleExpression(CE->getArg(I));
    if (N != 1) Out << 'E';
    break;
  }

  case Expr::CXXScalarValueInitExprClass:
    Out <<"cv";
    mangleType(E->getType());
    Out <<"_E";
    break;

  case Expr::UnaryExprOrTypeTraitExprClass: {
    const UnaryExprOrTypeTraitExpr *SAE = cast<UnaryExprOrTypeTraitExpr>(E);
    
    if (!SAE->isInstantiationDependent()) {
      // Itanium C++ ABI:
      //   If the operand of a sizeof or alignof operator is not 
      //   instantiation-dependent it is encoded as an integer literal 
      //   reflecting the result of the operator.
      //
      //   If the result of the operator is implicitly converted to a known 
      //   integer type, that type is used for the literal; otherwise, the type 
      //   of std::size_t or std::ptrdiff_t is used.
      QualType T = (ImplicitlyConvertedToType.isNull() || 
                    !ImplicitlyConvertedToType->isIntegerType())? SAE->getType()
                                                    : ImplicitlyConvertedToType;
      llvm::APSInt V = SAE->EvaluateKnownConstInt(Context.getASTContext());
      mangleIntegerLiteral(T, V);
      break;
    }
    
    switch(SAE->getKind()) {
    case UETT_SizeOf:
      Out << 's';
      break;
    case UETT_AlignOf:
      Out << 'a';
      break;
    case UETT_VecStep:
      DiagnosticsEngine &Diags = Context.getDiags();
      unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
                                     "cannot yet mangle vec_step expression");
      Diags.Report(DiagID);
      return;
    }
    if (SAE->isArgumentType()) {
      Out << 't';
      mangleType(SAE->getArgumentType());
    } else {
      Out << 'z';
      mangleExpression(SAE->getArgumentExpr());
    }
    break;
  }

  case Expr::CXXThrowExprClass: {
    const CXXThrowExpr *TE = cast<CXXThrowExpr>(E);

    // Proposal from David Vandervoorde, 2010.06.30
    if (TE->getSubExpr()) {
      Out << "tw";
      mangleExpression(TE->getSubExpr());
    } else {
      Out << "tr";
    }
    break;
  }

  case Expr::CXXTypeidExprClass: {
    const CXXTypeidExpr *TIE = cast<CXXTypeidExpr>(E);

    // Proposal from David Vandervoorde, 2010.06.30
    if (TIE->isTypeOperand()) {
      Out << "ti";
      mangleType(TIE->getTypeOperand());
    } else {
      Out << "te";
      mangleExpression(TIE->getExprOperand());
    }
    break;
  }

  case Expr::CXXDeleteExprClass: {
    const CXXDeleteExpr *DE = cast<CXXDeleteExpr>(E);

    // Proposal from David Vandervoorde, 2010.06.30
    if (DE->isGlobalDelete()) Out << "gs";
    Out << (DE->isArrayForm() ? "da" : "dl");
    mangleExpression(DE->getArgument());
    break;
  }

  case Expr::UnaryOperatorClass: {
    const UnaryOperator *UO = cast<UnaryOperator>(E);
    mangleOperatorName(UnaryOperator::getOverloadedOperator(UO->getOpcode()),
                       /*Arity=*/1);
    mangleExpression(UO->getSubExpr());
    break;
  }

  case Expr::ArraySubscriptExprClass: {
    const ArraySubscriptExpr *AE = cast<ArraySubscriptExpr>(E);

    // Array subscript is treated as a syntactically weird form of
    // binary operator.
    Out << "ix";
    mangleExpression(AE->getLHS());
    mangleExpression(AE->getRHS());
    break;
  }

  case Expr::CompoundAssignOperatorClass: // fallthrough
  case Expr::BinaryOperatorClass: {
    const BinaryOperator *BO = cast<BinaryOperator>(E);
    if (BO->getOpcode() == BO_PtrMemD)
      Out << "ds";
    else
      mangleOperatorName(BinaryOperator::getOverloadedOperator(BO->getOpcode()),
                         /*Arity=*/2);
    mangleExpression(BO->getLHS());
    mangleExpression(BO->getRHS());
    break;
  }

  case Expr::ConditionalOperatorClass: {
    const ConditionalOperator *CO = cast<ConditionalOperator>(E);
    mangleOperatorName(OO_Conditional, /*Arity=*/3);
    mangleExpression(CO->getCond());
    mangleExpression(CO->getLHS(), Arity);
    mangleExpression(CO->getRHS(), Arity);
    break;
  }

  case Expr::ImplicitCastExprClass: {
    ImplicitlyConvertedToType = E->getType();
    E = cast<ImplicitCastExpr>(E)->getSubExpr();
    goto recurse;
  }
      
  case Expr::ObjCBridgedCastExprClass: {
    // Mangle ownership casts as a vendor extended operator __bridge, 
    // __bridge_transfer, or __bridge_retain.
    StringRef Kind = cast<ObjCBridgedCastExpr>(E)->getBridgeKindName();
    Out << "v1U" << Kind.size() << Kind;
  }
  // Fall through to mangle the cast itself.
      
  case Expr::CStyleCastExprClass:
  case Expr::CXXStaticCastExprClass:
  case Expr::CXXDynamicCastExprClass:
  case Expr::CXXReinterpretCastExprClass:
  case Expr::CXXConstCastExprClass:
  case Expr::CXXFunctionalCastExprClass: {
    const ExplicitCastExpr *ECE = cast<ExplicitCastExpr>(E);
    Out << "cv";
    mangleType(ECE->getType());
    mangleExpression(ECE->getSubExpr());
    break;
  }

  case Expr::CXXOperatorCallExprClass: {
    const CXXOperatorCallExpr *CE = cast<CXXOperatorCallExpr>(E);
    unsigned NumArgs = CE->getNumArgs();
    mangleOperatorName(CE->getOperator(), /*Arity=*/NumArgs);
    // Mangle the arguments.
    for (unsigned i = 0; i != NumArgs; ++i)
      mangleExpression(CE->getArg(i));
    break;
  }

  case Expr::ParenExprClass:
    mangleExpression(cast<ParenExpr>(E)->getSubExpr(), Arity);
    break;

  case Expr::DeclRefExprClass: {
    const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl();

    switch (D->getKind()) {
    default:
      //  <expr-primary> ::= L <mangled-name> E # external name
      Out << 'L';
      mangle(D, "_Z");
      Out << 'E';
      break;

    case Decl::ParmVar:
      mangleFunctionParam(cast<ParmVarDecl>(D));
      break;

    case Decl::EnumConstant: {
      const EnumConstantDecl *ED = cast<EnumConstantDecl>(D);
      mangleIntegerLiteral(ED->getType(), ED->getInitVal());
      break;
    }

    case Decl::NonTypeTemplateParm: {
      const NonTypeTemplateParmDecl *PD = cast<NonTypeTemplateParmDecl>(D);
      mangleTemplateParameter(PD->getIndex());
      break;
    }

    }

    break;
  }

  case Expr::SubstNonTypeTemplateParmPackExprClass:
    // FIXME: not clear how to mangle this!
    // template <unsigned N...> class A {
    //   template <class U...> void foo(U (&x)[N]...);
    // };
    Out << "_SUBSTPACK_";
    break;
      
  case Expr::DependentScopeDeclRefExprClass: {
    const DependentScopeDeclRefExpr *DRE = cast<DependentScopeDeclRefExpr>(E);
    mangleUnresolvedName(DRE->getQualifier(), 0, DRE->getDeclName(), Arity);

    // All the <unresolved-name> productions end in a
    // base-unresolved-name, where <template-args> are just tacked
    // onto the end.
    if (DRE->hasExplicitTemplateArgs())
      mangleTemplateArgs(DRE->getExplicitTemplateArgs());
    break;
  }

  case Expr::CXXBindTemporaryExprClass:
    mangleExpression(cast<CXXBindTemporaryExpr>(E)->getSubExpr());
    break;

  case Expr::ExprWithCleanupsClass:
    mangleExpression(cast<ExprWithCleanups>(E)->getSubExpr(), Arity);
    break;

  case Expr::FloatingLiteralClass: {
    const FloatingLiteral *FL = cast<FloatingLiteral>(E);
    Out << 'L';
    mangleType(FL->getType());
    mangleFloat(FL->getValue());
    Out << 'E';
    break;
  }

  case Expr::CharacterLiteralClass:
    Out << 'L';
    mangleType(E->getType());
    Out << cast<CharacterLiteral>(E)->getValue();
    Out << 'E';
    break;

  // FIXME. __objc_yes/__objc_no are mangled same as true/false
  case Expr::ObjCBoolLiteralExprClass:
    Out << "Lb";
    Out << (cast<ObjCBoolLiteralExpr>(E)->getValue() ? '1' : '0');
    Out << 'E';
    break;
  
  case Expr::CXXBoolLiteralExprClass:
    Out << "Lb";
    Out << (cast<CXXBoolLiteralExpr>(E)->getValue() ? '1' : '0');
    Out << 'E';
    break;

  case Expr::IntegerLiteralClass: {
    llvm::APSInt Value(cast<IntegerLiteral>(E)->getValue());
    if (E->getType()->isSignedIntegerType())
      Value.setIsSigned(true);
    mangleIntegerLiteral(E->getType(), Value);
    break;
  }

  case Expr::ImaginaryLiteralClass: {
    const ImaginaryLiteral *IE = cast<ImaginaryLiteral>(E);
    // Mangle as if a complex literal.
    // Proposal from David Vandevoorde, 2010.06.30.
    Out << 'L';
    mangleType(E->getType());
    if (const FloatingLiteral *Imag =
          dyn_cast<FloatingLiteral>(IE->getSubExpr())) {
      // Mangle a floating-point zero of the appropriate type.
      mangleFloat(llvm::APFloat(Imag->getValue().getSemantics()));
      Out << '_';
      mangleFloat(Imag->getValue());
    } else {
      Out << "0_";
      llvm::APSInt Value(cast<IntegerLiteral>(IE->getSubExpr())->getValue());
      if (IE->getSubExpr()->getType()->isSignedIntegerType())
        Value.setIsSigned(true);
      mangleNumber(Value);
    }
    Out << 'E';
    break;
  }

  case Expr::StringLiteralClass: {
    // Revised proposal from David Vandervoorde, 2010.07.15.
    Out << 'L';
    assert(isa<ConstantArrayType>(E->getType()));
    mangleType(E->getType());
    Out << 'E';
    break;
  }

  case Expr::GNUNullExprClass:
    // FIXME: should this really be mangled the same as nullptr?
    // fallthrough

  case Expr::CXXNullPtrLiteralExprClass: {
    // Proposal from David Vandervoorde, 2010.06.30, as
    // modified by ABI list discussion.
    Out << "LDnE";
    break;
  }
      
  case Expr::PackExpansionExprClass:
    Out << "sp";
    mangleExpression(cast<PackExpansionExpr>(E)->getPattern());
    break;
      
  case Expr::SizeOfPackExprClass: {
    Out << "sZ";
    const NamedDecl *Pack = cast<SizeOfPackExpr>(E)->getPack();
    if (const TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Pack))
      mangleTemplateParameter(TTP->getIndex());
    else if (const NonTypeTemplateParmDecl *NTTP
                = dyn_cast<NonTypeTemplateParmDecl>(Pack))
      mangleTemplateParameter(NTTP->getIndex());
    else if (const TemplateTemplateParmDecl *TempTP
                                    = dyn_cast<TemplateTemplateParmDecl>(Pack))
      mangleTemplateParameter(TempTP->getIndex());
    else
      mangleFunctionParam(cast<ParmVarDecl>(Pack));
    break;
  }
      
  case Expr::MaterializeTemporaryExprClass: {
    mangleExpression(cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr());
    break;
  }
      
  case Expr::CXXThisExprClass:
    Out << "fpT";
    break;
  }
}

/// Mangle an expression which refers to a parameter variable.
///
/// <expression>     ::= <function-param>
/// <function-param> ::= fp <top-level CV-qualifiers> _      # L == 0, I == 0
/// <function-param> ::= fp <top-level CV-qualifiers>
///                      <parameter-2 non-negative number> _ # L == 0, I > 0
/// <function-param> ::= fL <L-1 non-negative number>
///                      p <top-level CV-qualifiers> _       # L > 0, I == 0
/// <function-param> ::= fL <L-1 non-negative number>
///                      p <top-level CV-qualifiers>
///                      <I-1 non-negative number> _         # L > 0, I > 0
///
/// L is the nesting depth of the parameter, defined as 1 if the
/// parameter comes from the innermost function prototype scope
/// enclosing the current context, 2 if from the next enclosing
/// function prototype scope, and so on, with one special case: if
/// we've processed the full parameter clause for the innermost
/// function type, then L is one less.  This definition conveniently
/// makes it irrelevant whether a function's result type was written
/// trailing or leading, but is otherwise overly complicated; the
/// numbering was first designed without considering references to
/// parameter in locations other than return types, and then the
/// mangling had to be generalized without changing the existing
/// manglings.
///
/// I is the zero-based index of the parameter within its parameter
/// declaration clause.  Note that the original ABI document describes
/// this using 1-based ordinals.
void CXXNameMangler::mangleFunctionParam(const ParmVarDecl *parm) {
  unsigned parmDepth = parm->getFunctionScopeDepth();
  unsigned parmIndex = parm->getFunctionScopeIndex();

  // Compute 'L'.
  // parmDepth does not include the declaring function prototype.
  // FunctionTypeDepth does account for that.
  assert(parmDepth < FunctionTypeDepth.getDepth());
  unsigned nestingDepth = FunctionTypeDepth.getDepth() - parmDepth;
  if (FunctionTypeDepth.isInResultType())
    nestingDepth--;

  if (nestingDepth == 0) {
    Out << "fp";
  } else {
    Out << "fL" << (nestingDepth - 1) << 'p';
  }

  // Top-level qualifiers.  We don't have to worry about arrays here,
  // because parameters declared as arrays should already have been
  // tranformed to have pointer type. FIXME: apparently these don't
  // get mangled if used as an rvalue of a known non-class type?
  assert(!parm->getType()->isArrayType()
         && "parameter's type is still an array type?");
  mangleQualifiers(parm->getType().getQualifiers());

  // Parameter index.
  if (parmIndex != 0) {
    Out << (parmIndex - 1);
  }
  Out << '_';
}

void CXXNameMangler::mangleCXXCtorType(CXXCtorType T) {
  // <ctor-dtor-name> ::= C1  # complete object constructor
  //                  ::= C2  # base object constructor
  //                  ::= C3  # complete object allocating constructor
  //
  switch (T) {
  case Ctor_Complete:
    Out << "C1";
    break;
  case Ctor_Base:
    Out << "C2";
    break;
  case Ctor_CompleteAllocating:
    Out << "C3";
    break;
  }
}

void CXXNameMangler::mangleCXXDtorType(CXXDtorType T) {
  // <ctor-dtor-name> ::= D0  # deleting destructor
  //                  ::= D1  # complete object destructor
  //                  ::= D2  # base object destructor
  //
  switch (T) {
  case Dtor_Deleting:
    Out << "D0";
    break;
  case Dtor_Complete:
    Out << "D1";
    break;
  case Dtor_Base:
    Out << "D2";
    break;
  }
}

void CXXNameMangler::mangleTemplateArgs(
                          const ASTTemplateArgumentListInfo &TemplateArgs) {
  // <template-args> ::= I <template-arg>+ E
  Out << 'I';
  for (unsigned i = 0, e = TemplateArgs.NumTemplateArgs; i != e; ++i)
    mangleTemplateArg(0, TemplateArgs.getTemplateArgs()[i].getArgument());
  Out << 'E';
}

void CXXNameMangler::mangleTemplateArgs(TemplateName Template,
                                        const TemplateArgument *TemplateArgs,
                                        unsigned NumTemplateArgs) {
  if (TemplateDecl *TD = Template.getAsTemplateDecl())
    return mangleTemplateArgs(*TD->getTemplateParameters(), TemplateArgs,
                              NumTemplateArgs);
  
  mangleUnresolvedTemplateArgs(TemplateArgs, NumTemplateArgs);
}

void CXXNameMangler::mangleUnresolvedTemplateArgs(const TemplateArgument *args,
                                                  unsigned numArgs) {
  // <template-args> ::= I <template-arg>+ E
  Out << 'I';
  for (unsigned i = 0; i != numArgs; ++i)
    mangleTemplateArg(0, args[i]);
  Out << 'E';
}

void CXXNameMangler::mangleTemplateArgs(const TemplateParameterList &PL,
                                        const TemplateArgumentList &AL) {
  // <template-args> ::= I <template-arg>+ E
  Out << 'I';
  for (unsigned i = 0, e = AL.size(); i != e; ++i)
    mangleTemplateArg(PL.getParam(i), AL[i]);
  Out << 'E';
}

void CXXNameMangler::mangleTemplateArgs(const TemplateParameterList &PL,
                                        const TemplateArgument *TemplateArgs,
                                        unsigned NumTemplateArgs) {
  // <template-args> ::= I <template-arg>+ E
  Out << 'I';
  for (unsigned i = 0; i != NumTemplateArgs; ++i)
    mangleTemplateArg(PL.getParam(i), TemplateArgs[i]);
  Out << 'E';
}

void CXXNameMangler::mangleTemplateArg(const NamedDecl *P,
                                       TemplateArgument A) {
  // <template-arg> ::= <type>              # type or template
  //                ::= X <expression> E    # expression
  //                ::= <expr-primary>      # simple expressions
  //                ::= J <template-arg>* E # argument pack
  //                ::= sp <expression>     # pack expansion of (C++0x)  
  if (!A.isInstantiationDependent() || A.isDependent())
    A = Context.getASTContext().getCanonicalTemplateArgument(A);
  
  switch (A.getKind()) {
  case TemplateArgument::Null:
    llvm_unreachable("Cannot mangle NULL template argument");
      
  case TemplateArgument::Type:
    mangleType(A.getAsType());
    break;
  case TemplateArgument::Template:
    // This is mangled as <type>.
    mangleType(A.getAsTemplate());
    break;
  case TemplateArgument::TemplateExpansion:
    // <type>  ::= Dp <type>          # pack expansion (C++0x)
    Out << "Dp";
    mangleType(A.getAsTemplateOrTemplatePattern());
    break;
  case TemplateArgument::Expression: {
    // It's possible to end up with a DeclRefExpr here in certain
    // dependent cases, in which case we should mangle as a
    // declaration.
    const Expr *E = A.getAsExpr()->IgnoreParens();
    if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
      const ValueDecl *D = DRE->getDecl();
      if (isa<VarDecl>(D) || isa<FunctionDecl>(D)) {
        Out << "L";
        mangle(D, "_Z");
        Out << 'E';
        break;
      }
    }
    
    Out << 'X';
    mangleExpression(E);
    Out << 'E';
    break;
  }
  case TemplateArgument::Integral:
    mangleIntegerLiteral(A.getIntegralType(), *A.getAsIntegral());
    break;
  case TemplateArgument::Declaration: {
    assert(P && "Missing template parameter for declaration argument");
    //  <expr-primary> ::= L <mangled-name> E # external name
    //  <expr-primary> ::= L <type> 0 E
    // Clang produces AST's where pointer-to-member-function expressions
    // and pointer-to-function expressions are represented as a declaration not
    // an expression. We compensate for it here to produce the correct mangling.
    const NonTypeTemplateParmDecl *Parameter = cast<NonTypeTemplateParmDecl>(P);

    // Handle NULL pointer arguments.
    if (!A.getAsDecl()) {
      Out << "L";
      mangleType(Parameter->getType());
      Out << "0E";
      break;
    }
    

    NamedDecl *D = cast<NamedDecl>(A.getAsDecl());
    bool compensateMangling = !Parameter->getType()->isReferenceType();
    if (compensateMangling) {
      Out << 'X';
      mangleOperatorName(OO_Amp, 1);
    }

    Out << 'L';
    // References to external entities use the mangled name; if the name would
    // not normally be manged then mangle it as unqualified.
    //
    // FIXME: The ABI specifies that external names here should have _Z, but
    // gcc leaves this off.
    if (compensateMangling)
      mangle(D, "_Z");
    else
      mangle(D, "Z");
    Out << 'E';

    if (compensateMangling)
      Out << 'E';

    break;
  }
      
  case TemplateArgument::Pack: {
    // Note: proposal by Mike Herrick on 12/20/10
    Out << 'J';
    for (TemplateArgument::pack_iterator PA = A.pack_begin(), 
                                      PAEnd = A.pack_end();
         PA != PAEnd; ++PA)
      mangleTemplateArg(P, *PA);
    Out << 'E';
  }
  }
}

void CXXNameMangler::mangleTemplateParameter(unsigned Index) {
  // <template-param> ::= T_    # first template parameter
  //                  ::= T <parameter-2 non-negative number> _
  if (Index == 0)
    Out << "T_";
  else
    Out << 'T' << (Index - 1) << '_';
}

void CXXNameMangler::mangleExistingSubstitution(QualType type) {
  bool result = mangleSubstitution(type);
  assert(result && "no existing substitution for type");
  (void) result;
}

void CXXNameMangler::mangleExistingSubstitution(TemplateName tname) {
  bool result = mangleSubstitution(tname);
  assert(result && "no existing substitution for template name");
  (void) result;
}

// <substitution> ::= S <seq-id> _
//                ::= S_
bool CXXNameMangler::mangleSubstitution(const NamedDecl *ND) {
  // Try one of the standard substitutions first.
  if (mangleStandardSubstitution(ND))
    return true;

  ND = cast<NamedDecl>(ND->getCanonicalDecl());
  return mangleSubstitution(reinterpret_cast<uintptr_t>(ND));
}

/// \brief Determine whether the given type has any qualifiers that are
/// relevant for substitutions.
static bool hasMangledSubstitutionQualifiers(QualType T) {
  Qualifiers Qs = T.getQualifiers();
  return Qs.getCVRQualifiers() || Qs.hasAddressSpace();
}

bool CXXNameMangler::mangleSubstitution(QualType T) {
  if (!hasMangledSubstitutionQualifiers(T)) {
    if (const RecordType *RT = T->getAs<RecordType>())
      return mangleSubstitution(RT->getDecl());
  }

  uintptr_t TypePtr = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());

  return mangleSubstitution(TypePtr);
}

bool CXXNameMangler::mangleSubstitution(TemplateName Template) {
  if (TemplateDecl *TD = Template.getAsTemplateDecl())
    return mangleSubstitution(TD);
  
  Template = Context.getASTContext().getCanonicalTemplateName(Template);
  return mangleSubstitution(
                      reinterpret_cast<uintptr_t>(Template.getAsVoidPointer()));
}

bool CXXNameMangler::mangleSubstitution(uintptr_t Ptr) {
  llvm::DenseMap<uintptr_t, unsigned>::iterator I = Substitutions.find(Ptr);
  if (I == Substitutions.end())
    return false;

  unsigned SeqID = I->second;
  if (SeqID == 0)
    Out << "S_";
  else {
    SeqID--;

    // <seq-id> is encoded in base-36, using digits and upper case letters.
    char Buffer[10];
    char *BufferPtr = llvm::array_endof(Buffer);

    if (SeqID == 0) *--BufferPtr = '0';

    while (SeqID) {
      assert(BufferPtr > Buffer && "Buffer overflow!");

      char c = static_cast<char>(SeqID % 36);

      *--BufferPtr =  (c < 10 ? '0' + c : 'A' + c - 10);
      SeqID /= 36;
    }

    Out << 'S'
        << StringRef(BufferPtr, llvm::array_endof(Buffer)-BufferPtr)
        << '_';
  }

  return true;
}

static bool isCharType(QualType T) {
  if (T.isNull())
    return false;

  return T->isSpecificBuiltinType(BuiltinType::Char_S) ||
    T->isSpecificBuiltinType(BuiltinType::Char_U);
}

/// isCharSpecialization - Returns whether a given type is a template
/// specialization of a given name with a single argument of type char.
static bool isCharSpecialization(QualType T, const char *Name) {
  if (T.isNull())
    return false;

  const RecordType *RT = T->getAs<RecordType>();
  if (!RT)
    return false;

  const ClassTemplateSpecializationDecl *SD =
    dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
  if (!SD)
    return false;

  if (!isStdNamespace(getEffectiveDeclContext(SD)))
    return false;

  const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs();
  if (TemplateArgs.size() != 1)
    return false;

  if (!isCharType(TemplateArgs[0].getAsType()))
    return false;

  return SD->getIdentifier()->getName() == Name;
}

template <std::size_t StrLen>
static bool isStreamCharSpecialization(const ClassTemplateSpecializationDecl*SD,
                                       const char (&Str)[StrLen]) {
  if (!SD->getIdentifier()->isStr(Str))
    return false;

  const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs();
  if (TemplateArgs.size() != 2)
    return false;

  if (!isCharType(TemplateArgs[0].getAsType()))
    return false;

  if (!isCharSpecialization(TemplateArgs[1].getAsType(), "char_traits"))
    return false;

  return true;
}

bool CXXNameMangler::mangleStandardSubstitution(const NamedDecl *ND) {
  // <substitution> ::= St # ::std::
  if (const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(ND)) {
    if (isStd(NS)) {
      Out << "St";
      return true;
    }
  }

  if (const ClassTemplateDecl *TD = dyn_cast<ClassTemplateDecl>(ND)) {
    if (!isStdNamespace(getEffectiveDeclContext(TD)))
      return false;

    // <substitution> ::= Sa # ::std::allocator
    if (TD->getIdentifier()->isStr("allocator")) {
      Out << "Sa";
      return true;
    }

    // <<substitution> ::= Sb # ::std::basic_string
    if (TD->getIdentifier()->isStr("basic_string")) {
      Out << "Sb";
      return true;
    }
  }

  if (const ClassTemplateSpecializationDecl *SD =
        dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
    if (!isStdNamespace(getEffectiveDeclContext(SD)))
      return false;

    //    <substitution> ::= Ss # ::std::basic_string<char,
    //                            ::std::char_traits<char>,
    //                            ::std::allocator<char> >
    if (SD->getIdentifier()->isStr("basic_string")) {
      const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs();

      if (TemplateArgs.size() != 3)
        return false;

      if (!isCharType(TemplateArgs[0].getAsType()))
        return false;

      if (!isCharSpecialization(TemplateArgs[1].getAsType(), "char_traits"))
        return false;

      if (!isCharSpecialization(TemplateArgs[2].getAsType(), "allocator"))
        return false;

      Out << "Ss";
      return true;
    }

    //    <substitution> ::= Si # ::std::basic_istream<char,
    //                            ::std::char_traits<char> >
    if (isStreamCharSpecialization(SD, "basic_istream")) {
      Out << "Si";
      return true;
    }

    //    <substitution> ::= So # ::std::basic_ostream<char,
    //                            ::std::char_traits<char> >
    if (isStreamCharSpecialization(SD, "basic_ostream")) {
      Out << "So";
      return true;
    }

    //    <substitution> ::= Sd # ::std::basic_iostream<char,
    //                            ::std::char_traits<char> >
    if (isStreamCharSpecialization(SD, "basic_iostream")) {
      Out << "Sd";
      return true;
    }
  }
  return false;
}

void CXXNameMangler::addSubstitution(QualType T) {
  if (!hasMangledSubstitutionQualifiers(T)) {
    if (const RecordType *RT = T->getAs<RecordType>()) {
      addSubstitution(RT->getDecl());
      return;
    }
  }

  uintptr_t TypePtr = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());
  addSubstitution(TypePtr);
}

void CXXNameMangler::addSubstitution(TemplateName Template) {
  if (TemplateDecl *TD = Template.getAsTemplateDecl())
    return addSubstitution(TD);
  
  Template = Context.getASTContext().getCanonicalTemplateName(Template);
  addSubstitution(reinterpret_cast<uintptr_t>(Template.getAsVoidPointer()));
}

void CXXNameMangler::addSubstitution(uintptr_t Ptr) {
  assert(!Substitutions.count(Ptr) && "Substitution already exists!");
  Substitutions[Ptr] = SeqID++;
}

//

/// \brief Mangles the name of the declaration D and emits that name to the
/// given output stream.
///
/// If the declaration D requires a mangled name, this routine will emit that
/// mangled name to \p os and return true. Otherwise, \p os will be unchanged
/// and this routine will return false. In this case, the caller should just
/// emit the identifier of the declaration (\c D->getIdentifier()) as its
/// name.
void ItaniumMangleContext::mangleName(const NamedDecl *D,
                                      raw_ostream &Out) {
  assert((isa<FunctionDecl>(D) || isa<VarDecl>(D)) &&
          "Invalid mangleName() call, argument is not a variable or function!");
  assert(!isa<CXXConstructorDecl>(D) && !isa<CXXDestructorDecl>(D) &&
         "Invalid mangleName() call on 'structor decl!");

  PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
                                 getASTContext().getSourceManager(),
                                 "Mangling declaration");

  CXXNameMangler Mangler(*this, Out, D);
  return Mangler.mangle(D);
}

void ItaniumMangleContext::mangleCXXCtor(const CXXConstructorDecl *D,
                                         CXXCtorType Type,
                                         raw_ostream &Out) {
  CXXNameMangler Mangler(*this, Out, D, Type);
  Mangler.mangle(D);
}

void ItaniumMangleContext::mangleCXXDtor(const CXXDestructorDecl *D,
                                         CXXDtorType Type,
                                         raw_ostream &Out) {
  CXXNameMangler Mangler(*this, Out, D, Type);
  Mangler.mangle(D);
}

void ItaniumMangleContext::mangleThunk(const CXXMethodDecl *MD,
                                       const ThunkInfo &Thunk,
                                       raw_ostream &Out) {
  //  <special-name> ::= T <call-offset> <base encoding>
  //                      # base is the nominal target function of thunk
  //  <special-name> ::= Tc <call-offset> <call-offset> <base encoding>
  //                      # base is the nominal target function of thunk
  //                      # first call-offset is 'this' adjustment
  //                      # second call-offset is result adjustment
  
  assert(!isa<CXXDestructorDecl>(MD) &&
         "Use mangleCXXDtor for destructor decls!");
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZT";
  if (!Thunk.Return.isEmpty())
    Mangler.getStream() << 'c';
  
  // Mangle the 'this' pointer adjustment.
  Mangler.mangleCallOffset(Thunk.This.NonVirtual, Thunk.This.VCallOffsetOffset);
  
  // Mangle the return pointer adjustment if there is one.
  if (!Thunk.Return.isEmpty())
    Mangler.mangleCallOffset(Thunk.Return.NonVirtual,
                             Thunk.Return.VBaseOffsetOffset);
  
  Mangler.mangleFunctionEncoding(MD);
}

void 
ItaniumMangleContext::mangleCXXDtorThunk(const CXXDestructorDecl *DD,
                                         CXXDtorType Type,
                                         const ThisAdjustment &ThisAdjustment,
                                         raw_ostream &Out) {
  //  <special-name> ::= T <call-offset> <base encoding>
  //                      # base is the nominal target function of thunk
  CXXNameMangler Mangler(*this, Out, DD, Type);
  Mangler.getStream() << "_ZT";

  // Mangle the 'this' pointer adjustment.
  Mangler.mangleCallOffset(ThisAdjustment.NonVirtual, 
                           ThisAdjustment.VCallOffsetOffset);

  Mangler.mangleFunctionEncoding(DD);
}

/// mangleGuardVariable - Returns the mangled name for a guard variable
/// for the passed in VarDecl.
void ItaniumMangleContext::mangleItaniumGuardVariable(const VarDecl *D,
                                                      raw_ostream &Out) {
  //  <special-name> ::= GV <object name>       # Guard variable for one-time
  //                                            # initialization
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZGV";
  Mangler.mangleName(D);
}

void ItaniumMangleContext::mangleReferenceTemporary(const VarDecl *D,
                                                    raw_ostream &Out) {
  // We match the GCC mangling here.
  //  <special-name> ::= GR <object name>
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZGR";
  Mangler.mangleName(D);
}

void ItaniumMangleContext::mangleCXXVTable(const CXXRecordDecl *RD,
                                           raw_ostream &Out) {
  // <special-name> ::= TV <type>  # virtual table
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZTV";
  Mangler.mangleNameOrStandardSubstitution(RD);
}

void ItaniumMangleContext::mangleCXXVTT(const CXXRecordDecl *RD,
                                        raw_ostream &Out) {
  // <special-name> ::= TT <type>  # VTT structure
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZTT";
  Mangler.mangleNameOrStandardSubstitution(RD);
}

void ItaniumMangleContext::mangleCXXCtorVTable(const CXXRecordDecl *RD,
                                               int64_t Offset,
                                               const CXXRecordDecl *Type,
                                               raw_ostream &Out) {
  // <special-name> ::= TC <type> <offset number> _ <base type>
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZTC";
  Mangler.mangleNameOrStandardSubstitution(RD);
  Mangler.getStream() << Offset;
  Mangler.getStream() << '_';
  Mangler.mangleNameOrStandardSubstitution(Type);
}

void ItaniumMangleContext::mangleCXXRTTI(QualType Ty,
                                         raw_ostream &Out) {
  // <special-name> ::= TI <type>  # typeinfo structure
  assert(!Ty.hasQualifiers() && "RTTI info cannot have top-level qualifiers");
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZTI";
  Mangler.mangleType(Ty);
}

void ItaniumMangleContext::mangleCXXRTTIName(QualType Ty,
                                             raw_ostream &Out) {
  // <special-name> ::= TS <type>  # typeinfo name (null terminated byte string)
  CXXNameMangler Mangler(*this, Out);
  Mangler.getStream() << "_ZTS";
  Mangler.mangleType(Ty);
}

MangleContext *clang::createItaniumMangleContext(ASTContext &Context,
                                                 DiagnosticsEngine &Diags) {
  return new ItaniumMangleContext(Context, Diags);
}