1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
|
/* Basic IPA utilities for type inheritance graph construction and
devirtualization.
Copyright (C) 2013-2019 Free Software Foundation, Inc.
Contributed by Jan Hubicka
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Brief vocabulary:
ODR = One Definition Rule
In short, the ODR states that:
1 In any translation unit, a template, type, function, or object can
have no more than one definition. Some of these can have any number
of declarations. A definition provides an instance.
2 In the entire program, an object or non-inline function cannot have
more than one definition; if an object or function is used, it must
have exactly one definition. You can declare an object or function
that is never used, in which case you don't have to provide
a definition. In no event can there be more than one definition.
3 Some things, like types, templates, and extern inline functions, can
be defined in more than one translation unit. For a given entity,
each definition must be the same. Non-extern objects and functions
in different translation units are different entities, even if their
names and types are the same.
OTR = OBJ_TYPE_REF
This is the Gimple representation of type information of a polymorphic call.
It contains two parameters:
otr_type is a type of class whose method is called.
otr_token is the index into virtual table where address is taken.
BINFO
This is the type inheritance information attached to each tree
RECORD_TYPE by the C++ frontend. It provides information about base
types and virtual tables.
BINFO is linked to the RECORD_TYPE by TYPE_BINFO.
BINFO also links to its type by BINFO_TYPE and to the virtual table by
BINFO_VTABLE.
Base types of a given type are enumerated by BINFO_BASE_BINFO
vector. Members of this vectors are not BINFOs associated
with a base type. Rather they are new copies of BINFOs
(base BINFOs). Their virtual tables may differ from
virtual table of the base type. Also BINFO_OFFSET specifies
offset of the base within the type.
In the case of single inheritance, the virtual table is shared
and BINFO_VTABLE of base BINFO is NULL. In the case of multiple
inheritance the individual virtual tables are pointer to by
BINFO_VTABLE of base binfos (that differs of BINFO_VTABLE of
binfo associated to the base type).
BINFO lookup for a given base type and offset can be done by
get_binfo_at_offset. It returns proper BINFO whose virtual table
can be used for lookup of virtual methods associated with the
base type.
token
This is an index of virtual method in virtual table associated
to the type defining it. Token can be looked up from OBJ_TYPE_REF
or from DECL_VINDEX of a given virtual table.
polymorphic (indirect) call
This is callgraph representation of virtual method call. Every
polymorphic call contains otr_type and otr_token taken from
original OBJ_TYPE_REF at callgraph construction time.
What we do here:
build_type_inheritance_graph triggers a construction of the type inheritance
graph.
We reconstruct it based on types of methods we see in the unit.
This means that the graph is not complete. Types with no methods are not
inserted into the graph. Also types without virtual methods are not
represented at all, though it may be easy to add this.
The inheritance graph is represented as follows:
Vertices are structures odr_type. Every odr_type may correspond
to one or more tree type nodes that are equivalent by ODR rule.
(the multiple type nodes appear only with linktime optimization)
Edges are represented by odr_type->base and odr_type->derived_types.
At the moment we do not track offsets of types for multiple inheritance.
Adding this is easy.
possible_polymorphic_call_targets returns, given an parameters found in
indirect polymorphic edge all possible polymorphic call targets of the call.
pass_ipa_devirt performs simple speculative devirtualization.
*/
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "rtl.h"
#include "tree.h"
#include "gimple.h"
#include "alloc-pool.h"
#include "tree-pass.h"
#include "cgraph.h"
#include "lto-streamer.h"
#include "fold-const.h"
#include "print-tree.h"
#include "calls.h"
#include "ipa-utils.h"
#include "gimple-fold.h"
#include "symbol-summary.h"
#include "tree-vrp.h"
#include "ipa-prop.h"
#include "ipa-fnsummary.h"
#include "demangle.h"
#include "dbgcnt.h"
#include "gimple-pretty-print.h"
#include "intl.h"
#include "stringpool.h"
#include "attribs.h"
/* Hash based set of pairs of types. */
struct type_pair
{
tree first;
tree second;
};
template <>
struct default_hash_traits <type_pair>
: typed_noop_remove <type_pair>
{
GTY((skip)) typedef type_pair value_type;
GTY((skip)) typedef type_pair compare_type;
static hashval_t
hash (type_pair p)
{
return TYPE_UID (p.first) ^ TYPE_UID (p.second);
}
static bool
is_empty (type_pair p)
{
return p.first == NULL;
}
static bool
is_deleted (type_pair p ATTRIBUTE_UNUSED)
{
return false;
}
static bool
equal (const type_pair &a, const type_pair &b)
{
return a.first==b.first && a.second == b.second;
}
static void
mark_empty (type_pair &e)
{
e.first = NULL;
}
};
static bool odr_types_equivalent_p (tree, tree, bool, bool *,
hash_set<type_pair> *,
location_t, location_t);
static void warn_odr (tree t1, tree t2, tree st1, tree st2,
bool warn, bool *warned, const char *reason);
static bool odr_violation_reported = false;
/* Pointer set of all call targets appearing in the cache. */
static hash_set<cgraph_node *> *cached_polymorphic_call_targets;
/* The node of type inheritance graph. For each type unique in
One Definition Rule (ODR) sense, we produce one node linking all
main variants of types equivalent to it, bases and derived types. */
struct GTY(()) odr_type_d
{
/* leader type. */
tree type;
/* All bases; built only for main variants of types. */
vec<odr_type> GTY((skip)) bases;
/* All derived types with virtual methods seen in unit;
built only for main variants of types. */
vec<odr_type> GTY((skip)) derived_types;
/* All equivalent types, if more than one. */
vec<tree, va_gc> *types;
/* Set of all equivalent types, if NON-NULL. */
hash_set<tree> * GTY((skip)) types_set;
/* Unique ID indexing the type in odr_types array. */
int id;
/* Is it in anonymous namespace? */
bool anonymous_namespace;
/* Do we know about all derivations of given type? */
bool all_derivations_known;
/* Did we report ODR violation here? */
bool odr_violated;
/* Set when virtual table without RTTI previaled table with. */
bool rtti_broken;
};
/* Return TRUE if all derived types of T are known and thus
we may consider the walk of derived type complete.
This is typically true only for final anonymous namespace types and types
defined within functions (that may be COMDAT and thus shared across units,
but with the same set of derived types). */
bool
type_all_derivations_known_p (const_tree t)
{
if (TYPE_FINAL_P (t))
return true;
if (flag_ltrans)
return false;
/* Non-C++ types may have IDENTIFIER_NODE here, do not crash. */
if (!TYPE_NAME (t) || TREE_CODE (TYPE_NAME (t)) != TYPE_DECL)
return true;
if (type_in_anonymous_namespace_p (t))
return true;
return (decl_function_context (TYPE_NAME (t)) != NULL);
}
/* Return TRUE if type's constructors are all visible. */
static bool
type_all_ctors_visible_p (tree t)
{
return !flag_ltrans
&& symtab->state >= CONSTRUCTION
/* We cannot always use type_all_derivations_known_p.
For function local types we must assume case where
the function is COMDAT and shared in between units.
TODO: These cases are quite easy to get, but we need
to keep track of C++ privatizing via -Wno-weak
as well as the IPA privatizing. */
&& type_in_anonymous_namespace_p (t);
}
/* Return TRUE if type may have instance. */
static bool
type_possibly_instantiated_p (tree t)
{
tree vtable;
varpool_node *vnode;
/* TODO: Add abstract types here. */
if (!type_all_ctors_visible_p (t))
return true;
vtable = BINFO_VTABLE (TYPE_BINFO (t));
if (TREE_CODE (vtable) == POINTER_PLUS_EXPR)
vtable = TREE_OPERAND (TREE_OPERAND (vtable, 0), 0);
vnode = varpool_node::get (vtable);
return vnode && vnode->definition;
}
/* Hash used to unify ODR types based on their mangled name and for anonymous
namespace types. */
struct odr_name_hasher : pointer_hash <odr_type_d>
{
typedef union tree_node *compare_type;
static inline hashval_t hash (const odr_type_d *);
static inline bool equal (const odr_type_d *, const tree_node *);
static inline void remove (odr_type_d *);
};
/* Has used to unify ODR types based on their associated virtual table.
This hash is needed to keep -fno-lto-odr-type-merging to work and contains
only polymorphic types. Types with mangled names are inserted to both. */
struct odr_vtable_hasher:odr_name_hasher
{
static inline hashval_t hash (const odr_type_d *);
static inline bool equal (const odr_type_d *, const tree_node *);
};
static bool
can_be_name_hashed_p (tree t)
{
return (!in_lto_p || odr_type_p (t));
}
/* Hash type by its ODR name. */
static hashval_t
hash_odr_name (const_tree t)
{
gcc_checking_assert (TYPE_MAIN_VARIANT (t) == t);
/* If not in LTO, all main variants are unique, so we can do
pointer hash. */
if (!in_lto_p)
return htab_hash_pointer (t);
/* Anonymous types are unique. */
if (type_with_linkage_p (t) && type_in_anonymous_namespace_p (t))
return htab_hash_pointer (t);
gcc_checking_assert (TYPE_NAME (t)
&& DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t)));
return IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME (TYPE_NAME (t)));
}
/* Return the computed hashcode for ODR_TYPE. */
inline hashval_t
odr_name_hasher::hash (const odr_type_d *odr_type)
{
return hash_odr_name (odr_type->type);
}
static bool
can_be_vtable_hashed_p (tree t)
{
/* vtable hashing can distinguish only main variants. */
if (TYPE_MAIN_VARIANT (t) != t)
return false;
/* Anonymous namespace types are always handled by name hash. */
if (type_with_linkage_p (t) && type_in_anonymous_namespace_p (t))
return false;
return (TREE_CODE (t) == RECORD_TYPE
&& TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t)));
}
/* Hash type by assembler name of its vtable. */
static hashval_t
hash_odr_vtable (const_tree t)
{
tree v = BINFO_VTABLE (TYPE_BINFO (TYPE_MAIN_VARIANT (t)));
inchash::hash hstate;
gcc_checking_assert (in_lto_p);
gcc_checking_assert (!type_in_anonymous_namespace_p (t));
gcc_checking_assert (TREE_CODE (t) == RECORD_TYPE
&& TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t)));
gcc_checking_assert (TYPE_MAIN_VARIANT (t) == t);
if (TREE_CODE (v) == POINTER_PLUS_EXPR)
{
add_expr (TREE_OPERAND (v, 1), hstate);
v = TREE_OPERAND (TREE_OPERAND (v, 0), 0);
}
hstate.add_hwi (IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME (v)));
return hstate.end ();
}
/* Return the computed hashcode for ODR_TYPE. */
inline hashval_t
odr_vtable_hasher::hash (const odr_type_d *odr_type)
{
return hash_odr_vtable (odr_type->type);
}
/* For languages with One Definition Rule, work out if
types are the same based on their name.
This is non-trivial for LTO where minor differences in
the type representation may have prevented type merging
to merge two copies of otherwise equivalent type.
Until we start streaming mangled type names, this function works
only for polymorphic types.
*/
bool
types_same_for_odr (const_tree type1, const_tree type2)
{
gcc_checking_assert (TYPE_P (type1) && TYPE_P (type2));
type1 = TYPE_MAIN_VARIANT (type1);
type2 = TYPE_MAIN_VARIANT (type2);
if (type1 == type2)
return true;
if (!in_lto_p)
return false;
/* Anonymous namespace types are never duplicated. */
if ((type_with_linkage_p (type1) && type_in_anonymous_namespace_p (type1))
|| (type_with_linkage_p (type2) && type_in_anonymous_namespace_p (type2)))
return false;
/* ODR name of the type is set in DECL_ASSEMBLER_NAME of its TYPE_NAME.
Ideally we should never need types without ODR names here. It can however
happen in two cases:
1) for builtin types that are not streamed but rebuilt in lto/lto-lang.c
Here testing for equivalence is safe, since their MAIN_VARIANTs are
unique.
2) for units streamed with -fno-lto-odr-type-merging. Here we can't
establish precise ODR equivalency, but for correctness we care only
about equivalency on complete polymorphic types. For these we can
compare assembler names of their virtual tables. */
if ((!TYPE_NAME (type1) || !DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (type1)))
|| (!TYPE_NAME (type2) || !DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (type2))))
{
/* See if types are obviously different (i.e. different codes
or polymorphic wrt non-polymorphic). This is not strictly correct
for ODR violating programs, but we can't do better without streaming
ODR names. */
if (TREE_CODE (type1) != TREE_CODE (type2))
return false;
if (TREE_CODE (type1) == RECORD_TYPE
&& (TYPE_BINFO (type1) == NULL_TREE)
!= (TYPE_BINFO (type2) == NULL_TREE))
return false;
if (TREE_CODE (type1) == RECORD_TYPE && TYPE_BINFO (type1)
&& (BINFO_VTABLE (TYPE_BINFO (type1)) == NULL_TREE)
!= (BINFO_VTABLE (TYPE_BINFO (type2)) == NULL_TREE))
return false;
/* At the moment we have no way to establish ODR equivalence at LTO
other than comparing virtual table pointers of polymorphic types.
Eventually we should start saving mangled names in TYPE_NAME.
Then this condition will become non-trivial. */
if (TREE_CODE (type1) == RECORD_TYPE
&& TYPE_BINFO (type1) && TYPE_BINFO (type2)
&& BINFO_VTABLE (TYPE_BINFO (type1))
&& BINFO_VTABLE (TYPE_BINFO (type2)))
{
tree v1 = BINFO_VTABLE (TYPE_BINFO (type1));
tree v2 = BINFO_VTABLE (TYPE_BINFO (type2));
gcc_assert (TREE_CODE (v1) == POINTER_PLUS_EXPR
&& TREE_CODE (v2) == POINTER_PLUS_EXPR);
return (operand_equal_p (TREE_OPERAND (v1, 1),
TREE_OPERAND (v2, 1), 0)
&& DECL_ASSEMBLER_NAME
(TREE_OPERAND (TREE_OPERAND (v1, 0), 0))
== DECL_ASSEMBLER_NAME
(TREE_OPERAND (TREE_OPERAND (v2, 0), 0)));
}
gcc_unreachable ();
}
return (DECL_ASSEMBLER_NAME (TYPE_NAME (type1))
== DECL_ASSEMBLER_NAME (TYPE_NAME (type2)));
}
/* Return true if we can decide on ODR equivalency.
In non-LTO it is always decide, in LTO however it depends in the type has
ODR info attached. */
bool
types_odr_comparable (tree t1, tree t2)
{
return (!in_lto_p
|| TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)
|| (odr_type_p (TYPE_MAIN_VARIANT (t1))
&& odr_type_p (TYPE_MAIN_VARIANT (t2)))
|| (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE
&& TYPE_BINFO (t1) && TYPE_BINFO (t2)
&& polymorphic_type_binfo_p (TYPE_BINFO (t1))
&& polymorphic_type_binfo_p (TYPE_BINFO (t2))));
}
/* Return true if T1 and T2 are ODR equivalent. If ODR equivalency is not
known, be conservative and return false. */
bool
types_must_be_same_for_odr (tree t1, tree t2)
{
if (types_odr_comparable (t1, t2))
return types_same_for_odr (t1, t2);
else
return TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2);
}
/* If T is compound type, return type it is based on. */
static tree
compound_type_base (const_tree t)
{
if (TREE_CODE (t) == ARRAY_TYPE
|| POINTER_TYPE_P (t)
|| TREE_CODE (t) == COMPLEX_TYPE
|| VECTOR_TYPE_P (t))
return TREE_TYPE (t);
if (TREE_CODE (t) == METHOD_TYPE)
return TYPE_METHOD_BASETYPE (t);
if (TREE_CODE (t) == OFFSET_TYPE)
return TYPE_OFFSET_BASETYPE (t);
return NULL_TREE;
}
/* Return true if T is either ODR type or compound type based from it.
If the function return true, we know that T is a type originating from C++
source even at link-time. */
bool
odr_or_derived_type_p (const_tree t)
{
do
{
if (odr_type_p (TYPE_MAIN_VARIANT (t)))
return true;
/* Function type is a tricky one. Basically we can consider it
ODR derived if return type or any of the parameters is.
We need to check all parameters because LTO streaming merges
common types (such as void) and they are not considered ODR then. */
if (TREE_CODE (t) == FUNCTION_TYPE)
{
if (TYPE_METHOD_BASETYPE (t))
t = TYPE_METHOD_BASETYPE (t);
else
{
if (TREE_TYPE (t) && odr_or_derived_type_p (TREE_TYPE (t)))
return true;
for (t = TYPE_ARG_TYPES (t); t; t = TREE_CHAIN (t))
if (odr_or_derived_type_p (TYPE_MAIN_VARIANT (TREE_VALUE (t))))
return true;
return false;
}
}
else
t = compound_type_base (t);
}
while (t);
return t;
}
/* Compare types T1 and T2 and return true if they are
equivalent. */
inline bool
odr_name_hasher::equal (const odr_type_d *o1, const tree_node *t2)
{
tree t1 = o1->type;
gcc_checking_assert (TYPE_MAIN_VARIANT (t2) == t2);
gcc_checking_assert (TYPE_MAIN_VARIANT (t1) == t1);
if (t1 == t2)
return true;
if (!in_lto_p)
return false;
/* Check for anonymous namespaces. */
if ((type_with_linkage_p (t1) && type_in_anonymous_namespace_p (t1))
|| (type_with_linkage_p (t2) && type_in_anonymous_namespace_p (t2)))
return false;
gcc_checking_assert (DECL_ASSEMBLER_NAME (TYPE_NAME (t1)));
gcc_checking_assert (DECL_ASSEMBLER_NAME (TYPE_NAME (t2)));
return (DECL_ASSEMBLER_NAME (TYPE_NAME (t1))
== DECL_ASSEMBLER_NAME (TYPE_NAME (t2)));
}
/* Compare types T1 and T2 and return true if they are
equivalent. */
inline bool
odr_vtable_hasher::equal (const odr_type_d *o1, const tree_node *t2)
{
tree t1 = o1->type;
gcc_checking_assert (TYPE_MAIN_VARIANT (t2) == t2);
gcc_checking_assert (TYPE_MAIN_VARIANT (t1) == t1);
gcc_checking_assert (in_lto_p);
t1 = TYPE_MAIN_VARIANT (t1);
t2 = TYPE_MAIN_VARIANT (t2);
if (t1 == t2)
return true;
tree v1 = BINFO_VTABLE (TYPE_BINFO (t1));
tree v2 = BINFO_VTABLE (TYPE_BINFO (t2));
return (operand_equal_p (TREE_OPERAND (v1, 1),
TREE_OPERAND (v2, 1), 0)
&& DECL_ASSEMBLER_NAME
(TREE_OPERAND (TREE_OPERAND (v1, 0), 0))
== DECL_ASSEMBLER_NAME
(TREE_OPERAND (TREE_OPERAND (v2, 0), 0)));
}
/* Free ODR type V. */
inline void
odr_name_hasher::remove (odr_type_d *v)
{
v->bases.release ();
v->derived_types.release ();
if (v->types_set)
delete v->types_set;
ggc_free (v);
}
/* ODR type hash used to look up ODR type based on tree type node. */
typedef hash_table<odr_name_hasher> odr_hash_type;
static odr_hash_type *odr_hash;
typedef hash_table<odr_vtable_hasher> odr_vtable_hash_type;
static odr_vtable_hash_type *odr_vtable_hash;
/* ODR types are also stored into ODR_TYPE vector to allow consistent
walking. Bases appear before derived types. Vector is garbage collected
so we won't end up visiting empty types. */
static GTY(()) vec <odr_type, va_gc> *odr_types_ptr;
#define odr_types (*odr_types_ptr)
/* Set TYPE_BINFO of TYPE and its variants to BINFO. */
void
set_type_binfo (tree type, tree binfo)
{
for (; type; type = TYPE_NEXT_VARIANT (type))
if (COMPLETE_TYPE_P (type))
TYPE_BINFO (type) = binfo;
else
gcc_assert (!TYPE_BINFO (type));
}
/* Return true if type variants match.
This assumes that we already verified that T1 and T2 are variants of the
same type. */
static bool
type_variants_equivalent_p (tree t1, tree t2)
{
if (TYPE_QUALS (t1) != TYPE_QUALS (t2))
return false;
if (comp_type_attributes (t1, t2) != 1)
return false;
if (COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2)
&& TYPE_ALIGN (t1) != TYPE_ALIGN (t2))
return false;
return true;
}
/* Compare T1 and T2 based on name or structure. */
static bool
odr_subtypes_equivalent_p (tree t1, tree t2,
hash_set<type_pair> *visited,
location_t loc1, location_t loc2)
{
/* This can happen in incomplete types that should be handled earlier. */
gcc_assert (t1 && t2);
if (t1 == t2)
return true;
/* Anonymous namespace types must match exactly. */
if ((type_with_linkage_p (TYPE_MAIN_VARIANT (t1))
&& type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t1)))
|| (type_with_linkage_p (TYPE_MAIN_VARIANT (t2))
&& type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t2))))
return false;
/* For ODR types be sure to compare their names.
To support -Wno-odr-type-merging we allow one type to be non-ODR
and other ODR even though it is a violation. */
if (types_odr_comparable (t1, t2))
{
if (t1 != t2
&& odr_type_p (TYPE_MAIN_VARIANT (t1))
&& get_odr_type (TYPE_MAIN_VARIANT (t1), true)->odr_violated)
return false;
if (!types_same_for_odr (t1, t2))
return false;
if (!type_variants_equivalent_p (t1, t2))
return false;
/* Limit recursion: If subtypes are ODR types and we know
that they are same, be happy. */
if (odr_type_p (TYPE_MAIN_VARIANT (t1)))
return true;
}
/* Component types, builtins and possibly violating ODR types
have to be compared structurally. */
if (TREE_CODE (t1) != TREE_CODE (t2))
return false;
if (AGGREGATE_TYPE_P (t1)
&& (TYPE_NAME (t1) == NULL_TREE) != (TYPE_NAME (t2) == NULL_TREE))
return false;
type_pair pair={TYPE_MAIN_VARIANT (t1), TYPE_MAIN_VARIANT (t2)};
if (TYPE_UID (TYPE_MAIN_VARIANT (t1)) > TYPE_UID (TYPE_MAIN_VARIANT (t2)))
{
pair.first = TYPE_MAIN_VARIANT (t2);
pair.second = TYPE_MAIN_VARIANT (t1);
}
if (visited->add (pair))
return true;
if (!odr_types_equivalent_p (TYPE_MAIN_VARIANT (t1), TYPE_MAIN_VARIANT (t2),
false, NULL, visited, loc1, loc2))
return false;
if (!type_variants_equivalent_p (t1, t2))
return false;
return true;
}
/* Return true if DECL1 and DECL2 are identical methods. Consider
name equivalent to name.localalias.xyz. */
static bool
methods_equal_p (tree decl1, tree decl2)
{
if (DECL_ASSEMBLER_NAME (decl1) == DECL_ASSEMBLER_NAME (decl2))
return true;
const char sep = symbol_table::symbol_suffix_separator ();
const char *name1 = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl1));
const char *ptr1 = strchr (name1, sep);
int len1 = ptr1 ? ptr1 - name1 : strlen (name1);
const char *name2 = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl2));
const char *ptr2 = strchr (name2, sep);
int len2 = ptr2 ? ptr2 - name2 : strlen (name2);
if (len1 != len2)
return false;
return !strncmp (name1, name2, len1);
}
/* Compare two virtual tables, PREVAILING and VTABLE and output ODR
violation warnings. */
void
compare_virtual_tables (varpool_node *prevailing, varpool_node *vtable)
{
int n1, n2;
if (DECL_VIRTUAL_P (prevailing->decl) != DECL_VIRTUAL_P (vtable->decl))
{
odr_violation_reported = true;
if (DECL_VIRTUAL_P (prevailing->decl))
{
varpool_node *tmp = prevailing;
prevailing = vtable;
vtable = tmp;
}
auto_diagnostic_group d;
if (warning_at (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (vtable->decl))),
OPT_Wodr,
"virtual table of type %qD violates one definition rule",
DECL_CONTEXT (vtable->decl)))
inform (DECL_SOURCE_LOCATION (prevailing->decl),
"variable of same assembler name as the virtual table is "
"defined in another translation unit");
return;
}
if (!prevailing->definition || !vtable->definition)
return;
/* If we do not stream ODR type info, do not bother to do useful compare. */
if (!TYPE_BINFO (DECL_CONTEXT (vtable->decl))
|| !polymorphic_type_binfo_p (TYPE_BINFO (DECL_CONTEXT (vtable->decl))))
return;
odr_type class_type = get_odr_type (DECL_CONTEXT (vtable->decl), true);
if (class_type->odr_violated)
return;
for (n1 = 0, n2 = 0; true; n1++, n2++)
{
struct ipa_ref *ref1, *ref2;
bool end1, end2;
end1 = !prevailing->iterate_reference (n1, ref1);
end2 = !vtable->iterate_reference (n2, ref2);
/* !DECL_VIRTUAL_P means RTTI entry;
We warn when RTTI is lost because non-RTTI previals; we silently
accept the other case. */
while (!end2
&& (end1
|| (methods_equal_p (ref1->referred->decl,
ref2->referred->decl)
&& TREE_CODE (ref1->referred->decl) == FUNCTION_DECL))
&& TREE_CODE (ref2->referred->decl) != FUNCTION_DECL)
{
if (!class_type->rtti_broken)
{
auto_diagnostic_group d;
if (warning_at (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (vtable->decl))),
OPT_Wodr,
"virtual table of type %qD contains RTTI "
"information",
DECL_CONTEXT (vtable->decl)))
{
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"but is prevailed by one without from other"
" translation unit");
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"RTTI will not work on this type");
class_type->rtti_broken = true;
}
}
n2++;
end2 = !vtable->iterate_reference (n2, ref2);
}
while (!end1
&& (end2
|| (methods_equal_p (ref2->referred->decl, ref1->referred->decl)
&& TREE_CODE (ref2->referred->decl) == FUNCTION_DECL))
&& TREE_CODE (ref1->referred->decl) != FUNCTION_DECL)
{
n1++;
end1 = !prevailing->iterate_reference (n1, ref1);
}
/* Finished? */
if (end1 && end2)
{
/* Extra paranoia; compare the sizes. We do not have information
about virtual inheritance offsets, so just be sure that these
match.
Do this as very last check so the not very informative error
is not output too often. */
if (DECL_SIZE (prevailing->decl) != DECL_SIZE (vtable->decl))
{
class_type->odr_violated = true;
auto_diagnostic_group d;
tree ctx = TYPE_NAME (DECL_CONTEXT (vtable->decl));
if (warning_at (DECL_SOURCE_LOCATION (ctx), OPT_Wodr,
"virtual table of type %qD violates "
"one definition rule",
DECL_CONTEXT (vtable->decl)))
{
ctx = TYPE_NAME (DECL_CONTEXT (prevailing->decl));
inform (DECL_SOURCE_LOCATION (ctx),
"the conflicting type defined in another translation"
" unit has virtual table of different size");
}
}
return;
}
if (!end1 && !end2)
{
if (methods_equal_p (ref1->referred->decl, ref2->referred->decl))
continue;
class_type->odr_violated = true;
/* If the loops above stopped on non-virtual pointer, we have
mismatch in RTTI information mangling. */
if (TREE_CODE (ref1->referred->decl) != FUNCTION_DECL
&& TREE_CODE (ref2->referred->decl) != FUNCTION_DECL)
{
auto_diagnostic_group d;
if (warning_at (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (vtable->decl))),
OPT_Wodr,
"virtual table of type %qD violates "
"one definition rule",
DECL_CONTEXT (vtable->decl)))
{
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"the conflicting type defined in another translation "
"unit with different RTTI information");
}
return;
}
/* At this point both REF1 and REF2 points either to virtual table
or virtual method. If one points to virtual table and other to
method we can complain the same way as if one table was shorter
than other pointing out the extra method. */
if (TREE_CODE (ref1->referred->decl)
!= TREE_CODE (ref2->referred->decl))
{
if (VAR_P (ref1->referred->decl))
end1 = true;
else if (VAR_P (ref2->referred->decl))
end2 = true;
}
}
class_type->odr_violated = true;
/* Complain about size mismatch. Either we have too many virutal
functions or too many virtual table pointers. */
if (end1 || end2)
{
if (end1)
{
varpool_node *tmp = prevailing;
prevailing = vtable;
vtable = tmp;
ref1 = ref2;
}
auto_diagnostic_group d;
if (warning_at (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (vtable->decl))),
OPT_Wodr,
"virtual table of type %qD violates "
"one definition rule",
DECL_CONTEXT (vtable->decl)))
{
if (TREE_CODE (ref1->referring->decl) == FUNCTION_DECL)
{
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"the conflicting type defined in another translation "
"unit");
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (ref1->referring->decl))),
"contains additional virtual method %qD",
ref1->referred->decl);
}
else
{
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"the conflicting type defined in another translation "
"unit has virtual table with more entries");
}
}
return;
}
/* And in the last case we have either mistmatch in between two virtual
methods or two virtual table pointers. */
auto_diagnostic_group d;
if (warning_at (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (vtable->decl))), OPT_Wodr,
"virtual table of type %qD violates "
"one definition rule ",
DECL_CONTEXT (vtable->decl)))
{
if (TREE_CODE (ref1->referred->decl) == FUNCTION_DECL)
{
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"the conflicting type defined in another translation "
"unit");
gcc_assert (TREE_CODE (ref2->referred->decl)
== FUNCTION_DECL);
inform (DECL_SOURCE_LOCATION
(ref1->referred->ultimate_alias_target ()->decl),
"virtual method %qD",
ref1->referred->ultimate_alias_target ()->decl);
inform (DECL_SOURCE_LOCATION
(ref2->referred->ultimate_alias_target ()->decl),
"ought to match virtual method %qD but does not",
ref2->referred->ultimate_alias_target ()->decl);
}
else
inform (DECL_SOURCE_LOCATION
(TYPE_NAME (DECL_CONTEXT (prevailing->decl))),
"the conflicting type defined in another translation "
"unit has virtual table with different contents");
return;
}
}
}
/* Output ODR violation warning about T1 and T2 with REASON.
Display location of ST1 and ST2 if REASON speaks about field or
method of the type.
If WARN is false, do nothing. Set WARNED if warning was indeed
output. */
static void
warn_odr (tree t1, tree t2, tree st1, tree st2,
bool warn, bool *warned, const char *reason)
{
tree decl2 = TYPE_NAME (TYPE_MAIN_VARIANT (t2));
if (warned)
*warned = false;
if (!warn || !TYPE_NAME(TYPE_MAIN_VARIANT (t1)))
return;
/* ODR warnings are output druing LTO streaming; we must apply location
cache for potential warnings to be output correctly. */
if (lto_location_cache::current_cache)
lto_location_cache::current_cache->apply_location_cache ();
auto_diagnostic_group d;
if (t1 != TYPE_MAIN_VARIANT (t1)
&& TYPE_NAME (t1) != TYPE_NAME (TYPE_MAIN_VARIANT (t1)))
{
if (!warning_at (DECL_SOURCE_LOCATION (TYPE_NAME (TYPE_MAIN_VARIANT (t1))),
OPT_Wodr, "type %qT (typedef of %qT) violates the "
"C++ One Definition Rule",
t1, TYPE_MAIN_VARIANT (t1)))
return;
}
else
{
if (!warning_at (DECL_SOURCE_LOCATION (TYPE_NAME (TYPE_MAIN_VARIANT (t1))),
OPT_Wodr, "type %qT violates the C++ One Definition Rule",
t1))
return;
}
if (!st1 && !st2)
;
/* For FIELD_DECL support also case where one of fields is
NULL - this is used when the structures have mismatching number of
elements. */
else if (!st1 || TREE_CODE (st1) == FIELD_DECL)
{
inform (DECL_SOURCE_LOCATION (decl2),
"a different type is defined in another translation unit");
if (!st1)
{
st1 = st2;
st2 = NULL;
}
inform (DECL_SOURCE_LOCATION (st1),
"the first difference of corresponding definitions is field %qD",
st1);
if (st2)
decl2 = st2;
}
else if (TREE_CODE (st1) == FUNCTION_DECL)
{
inform (DECL_SOURCE_LOCATION (decl2),
"a different type is defined in another translation unit");
inform (DECL_SOURCE_LOCATION (st1),
"the first difference of corresponding definitions is method %qD",
st1);
decl2 = st2;
}
else
return;
inform (DECL_SOURCE_LOCATION (decl2), reason);
if (warned)
*warned = true;
}
/* Return ture if T1 and T2 are incompatible and we want to recusively
dive into them from warn_type_mismatch to give sensible answer. */
static bool
type_mismatch_p (tree t1, tree t2)
{
if (odr_or_derived_type_p (t1) && odr_or_derived_type_p (t2)
&& !odr_types_equivalent_p (t1, t2))
return true;
return !types_compatible_p (t1, t2);
}
/* Types T1 and T2 was found to be incompatible in a context they can't
(either used to declare a symbol of same assembler name or unified by
ODR rule). We already output warning about this, but if possible, output
extra information on how the types mismatch.
This is hard to do in general. We basically handle the common cases.
If LOC1 and LOC2 are meaningful locations, use it in the case the types
themselves do no thave one.*/
void
warn_types_mismatch (tree t1, tree t2, location_t loc1, location_t loc2)
{
/* Location of type is known only if it has TYPE_NAME and the name is
TYPE_DECL. */
location_t loc_t1 = TYPE_NAME (t1) && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL
? DECL_SOURCE_LOCATION (TYPE_NAME (t1))
: UNKNOWN_LOCATION;
location_t loc_t2 = TYPE_NAME (t2) && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL
? DECL_SOURCE_LOCATION (TYPE_NAME (t2))
: UNKNOWN_LOCATION;
bool loc_t2_useful = false;
/* With LTO it is a common case that the location of both types match.
See if T2 has a location that is different from T1. If so, we will
inform user about the location.
Do not consider the location passed to us in LOC1/LOC2 as those are
already output. */
if (loc_t2 > BUILTINS_LOCATION && loc_t2 != loc_t1)
{
if (loc_t1 <= BUILTINS_LOCATION)
loc_t2_useful = true;
else
{
expanded_location xloc1 = expand_location (loc_t1);
expanded_location xloc2 = expand_location (loc_t2);
if (strcmp (xloc1.file, xloc2.file)
|| xloc1.line != xloc2.line
|| xloc1.column != xloc2.column)
loc_t2_useful = true;
}
}
if (loc_t1 <= BUILTINS_LOCATION)
loc_t1 = loc1;
if (loc_t2 <= BUILTINS_LOCATION)
loc_t2 = loc2;
location_t loc = loc_t1 <= BUILTINS_LOCATION ? loc_t2 : loc_t1;
/* It is a quite common bug to reference anonymous namespace type in
non-anonymous namespace class. */
if ((type_with_linkage_p (TYPE_MAIN_VARIANT (t1))
&& type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t1)))
|| (type_with_linkage_p (TYPE_MAIN_VARIANT (t2))
&& type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t2))))
{
if (type_with_linkage_p (TYPE_MAIN_VARIANT (t1))
&& !type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t1)))
{
std::swap (t1, t2);
std::swap (loc_t1, loc_t2);
}
gcc_assert (TYPE_NAME (t1) && TYPE_NAME (t2)
&& TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL
&& TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL);
tree n1 = TYPE_NAME (t1);
tree n2 = TYPE_NAME (t2);
if (TREE_CODE (n1) == TYPE_DECL)
n1 = DECL_NAME (n1);
if (TREE_CODE (n2) == TYPE_DECL)
n2 = DECL_NAME (n2);
/* Most of the time, the type names will match, do not be unnecesarily
verbose. */
if (IDENTIFIER_POINTER (n1) != IDENTIFIER_POINTER (n2))
inform (loc_t1,
"type %qT defined in anonymous namespace cannot match "
"type %qT across the translation unit boundary",
t1, t2);
else
inform (loc_t1,
"type %qT defined in anonymous namespace cannot match "
"across the translation unit boundary",
t1);
if (loc_t2_useful)
inform (loc_t2,
"the incompatible type defined in another translation unit");
return;
}
tree mt1 = TYPE_MAIN_VARIANT (t1);
tree mt2 = TYPE_MAIN_VARIANT (t2);
/* If types have mangled ODR names and they are different, it is most
informative to output those.
This also covers types defined in different namespaces. */
if (TYPE_NAME (mt1) && TYPE_NAME (mt2)
&& TREE_CODE (TYPE_NAME (mt1)) == TYPE_DECL
&& TREE_CODE (TYPE_NAME (mt2)) == TYPE_DECL
&& DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (mt1))
&& DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (mt2))
&& DECL_ASSEMBLER_NAME (TYPE_NAME (mt1))
!= DECL_ASSEMBLER_NAME (TYPE_NAME (mt2)))
{
char *name1 = xstrdup (cplus_demangle
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (TYPE_NAME (mt1))),
DMGL_PARAMS | DMGL_ANSI | DMGL_TYPES));
char *name2 = cplus_demangle
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (TYPE_NAME (mt2))),
DMGL_PARAMS | DMGL_ANSI | DMGL_TYPES);
if (name1 && name2 && strcmp (name1, name2))
{
inform (loc_t1,
"type name %qs should match type name %qs",
name1, name2);
if (loc_t2_useful)
inform (loc_t2,
"the incompatible type is defined here");
free (name1);
return;
}
free (name1);
}
/* A tricky case are compound types. Often they appear the same in source
code and the mismatch is dragged in by type they are build from.
Look for those differences in subtypes and try to be informative. In other
cases just output nothing because the source code is probably different
and in this case we already output a all necessary info. */
if (!TYPE_NAME (t1) || !TYPE_NAME (t2))
{
if (TREE_CODE (t1) == TREE_CODE (t2))
{
if (TREE_CODE (t1) == ARRAY_TYPE
&& COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2))
{
tree i1 = TYPE_DOMAIN (t1);
tree i2 = TYPE_DOMAIN (t2);
if (i1 && i2
&& TYPE_MAX_VALUE (i1)
&& TYPE_MAX_VALUE (i2)
&& !operand_equal_p (TYPE_MAX_VALUE (i1),
TYPE_MAX_VALUE (i2), 0))
{
inform (loc,
"array types have different bounds");
return;
}
}
if ((POINTER_TYPE_P (t1) || TREE_CODE (t1) == ARRAY_TYPE)
&& type_mismatch_p (TREE_TYPE (t1), TREE_TYPE (t2)))
warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2), loc_t1, loc_t2);
else if (TREE_CODE (t1) == METHOD_TYPE
|| TREE_CODE (t1) == FUNCTION_TYPE)
{
tree parms1 = NULL, parms2 = NULL;
int count = 1;
if (type_mismatch_p (TREE_TYPE (t1), TREE_TYPE (t2)))
{
inform (loc, "return value type mismatch");
warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2), loc_t1,
loc_t2);
return;
}
if (prototype_p (t1) && prototype_p (t2))
for (parms1 = TYPE_ARG_TYPES (t1), parms2 = TYPE_ARG_TYPES (t2);
parms1 && parms2;
parms1 = TREE_CHAIN (parms1), parms2 = TREE_CHAIN (parms2),
count++)
{
if (type_mismatch_p (TREE_VALUE (parms1), TREE_VALUE (parms2)))
{
if (count == 1 && TREE_CODE (t1) == METHOD_TYPE)
inform (loc,
"implicit this pointer type mismatch");
else
inform (loc,
"type mismatch in parameter %i",
count - (TREE_CODE (t1) == METHOD_TYPE));
warn_types_mismatch (TREE_VALUE (parms1),
TREE_VALUE (parms2),
loc_t1, loc_t2);
return;
}
}
if (parms1 || parms2)
{
inform (loc,
"types have different parameter counts");
return;
}
}
}
return;
}
if (types_odr_comparable (t1, t2)
/* We make assign integers mangled names to be able to handle
signed/unsigned chars. Accepting them here would however lead to
confussing message like
"type ‘const int’ itself violates the C++ One Definition Rule" */
&& TREE_CODE (t1) != INTEGER_TYPE
&& types_same_for_odr (t1, t2))
inform (loc_t1,
"type %qT itself violates the C++ One Definition Rule", t1);
/* Prevent pointless warnings like "struct aa" should match "struct aa". */
else if (TYPE_NAME (t1) == TYPE_NAME (t2)
&& TREE_CODE (t1) == TREE_CODE (t2) && !loc_t2_useful)
return;
else
inform (loc_t1, "type %qT should match type %qT",
t1, t2);
if (loc_t2_useful)
inform (loc_t2, "the incompatible type is defined here");
}
/* Return true if T should be ignored in TYPE_FIELDS for ODR comparsion. */
static bool
skip_in_fields_list_p (tree t)
{
if (TREE_CODE (t) != FIELD_DECL)
return true;
/* C++ FE introduces zero sized fields depending on -std setting, see
PR89358. */
if (DECL_SIZE (t)
&& integer_zerop (DECL_SIZE (t))
&& DECL_ARTIFICIAL (t)
&& DECL_IGNORED_P (t)
&& !DECL_NAME (t))
return true;
return false;
}
/* Compare T1 and T2, report ODR violations if WARN is true and set
WARNED to true if anything is reported. Return true if types match.
If true is returned, the types are also compatible in the sense of
gimple_canonical_types_compatible_p.
If LOC1 and LOC2 is not UNKNOWN_LOCATION it may be used to output a warning
about the type if the type itself do not have location. */
static bool
odr_types_equivalent_p (tree t1, tree t2, bool warn, bool *warned,
hash_set<type_pair> *visited,
location_t loc1, location_t loc2)
{
/* Check first for the obvious case of pointer identity. */
if (t1 == t2)
return true;
/* Can't be the same type if the types don't have the same code. */
if (TREE_CODE (t1) != TREE_CODE (t2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a different type is defined in another translation unit"));
return false;
}
if ((type_with_linkage_p (TYPE_MAIN_VARIANT (t1))
&& type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t1)))
|| (type_with_linkage_p (TYPE_MAIN_VARIANT (t2))
&& type_in_anonymous_namespace_p (TYPE_MAIN_VARIANT (t2))))
{
/* We cannot trip this when comparing ODR types, only when trying to
match different ODR derivations from different declarations.
So WARN should be always false. */
gcc_assert (!warn);
return false;
}
if (TREE_CODE (t1) == ENUMERAL_TYPE
&& TYPE_VALUES (t1) && TYPE_VALUES (t2))
{
tree v1, v2;
for (v1 = TYPE_VALUES (t1), v2 = TYPE_VALUES (t2);
v1 && v2 ; v1 = TREE_CHAIN (v1), v2 = TREE_CHAIN (v2))
{
if (TREE_PURPOSE (v1) != TREE_PURPOSE (v2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("an enum with different value name"
" is defined in another translation unit"));
return false;
}
if (!operand_equal_p (TREE_VALUE (v1), TREE_VALUE (v2), 0))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("an enum with different values is defined"
" in another translation unit"));
return false;
}
}
if (v1 || v2)
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("an enum with mismatching number of values "
"is defined in another translation unit"));
return false;
}
}
/* Non-aggregate types can be handled cheaply. */
if (INTEGRAL_TYPE_P (t1)
|| SCALAR_FLOAT_TYPE_P (t1)
|| FIXED_POINT_TYPE_P (t1)
|| TREE_CODE (t1) == VECTOR_TYPE
|| TREE_CODE (t1) == COMPLEX_TYPE
|| TREE_CODE (t1) == OFFSET_TYPE
|| POINTER_TYPE_P (t1))
{
if (TYPE_PRECISION (t1) != TYPE_PRECISION (t2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different precision is defined "
"in another translation unit"));
return false;
}
if (TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different signedness is defined "
"in another translation unit"));
return false;
}
if (TREE_CODE (t1) == INTEGER_TYPE
&& TYPE_STRING_FLAG (t1) != TYPE_STRING_FLAG (t2))
{
/* char WRT uint_8? */
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a different type is defined in another "
"translation unit"));
return false;
}
/* For canonical type comparisons we do not want to build SCCs
so we cannot compare pointed-to types. But we can, for now,
require the same pointed-to type kind and match what
useless_type_conversion_p would do. */
if (POINTER_TYPE_P (t1))
{
if (TYPE_ADDR_SPACE (TREE_TYPE (t1))
!= TYPE_ADDR_SPACE (TREE_TYPE (t2)))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("it is defined as a pointer in different address "
"space in another translation unit"));
return false;
}
if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2),
visited, loc1, loc2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("it is defined as a pointer to different type "
"in another translation unit"));
if (warn && warned)
warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2),
loc1, loc2);
return false;
}
}
if ((TREE_CODE (t1) == VECTOR_TYPE || TREE_CODE (t1) == COMPLEX_TYPE)
&& !odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2),
visited, loc1, loc2))
{
/* Probably specific enough. */
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a different type is defined "
"in another translation unit"));
if (warn && warned)
warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2), loc1, loc2);
return false;
}
}
/* Do type-specific comparisons. */
else switch (TREE_CODE (t1))
{
case ARRAY_TYPE:
{
/* Array types are the same if the element types are the same and
the number of elements are the same. */
if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2),
visited, loc1, loc2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a different type is defined in another "
"translation unit"));
if (warn && warned)
warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2), loc1, loc2);
}
gcc_assert (TYPE_STRING_FLAG (t1) == TYPE_STRING_FLAG (t2));
gcc_assert (TYPE_NONALIASED_COMPONENT (t1)
== TYPE_NONALIASED_COMPONENT (t2));
tree i1 = TYPE_DOMAIN (t1);
tree i2 = TYPE_DOMAIN (t2);
/* For an incomplete external array, the type domain can be
NULL_TREE. Check this condition also. */
if (i1 == NULL_TREE || i2 == NULL_TREE)
return type_variants_equivalent_p (t1, t2);
tree min1 = TYPE_MIN_VALUE (i1);
tree min2 = TYPE_MIN_VALUE (i2);
tree max1 = TYPE_MAX_VALUE (i1);
tree max2 = TYPE_MAX_VALUE (i2);
/* In C++, minimums should be always 0. */
gcc_assert (min1 == min2);
if (!operand_equal_p (max1, max2, 0))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("an array of different size is defined "
"in another translation unit"));
return false;
}
}
break;
case METHOD_TYPE:
case FUNCTION_TYPE:
/* Function types are the same if the return type and arguments types
are the same. */
if (!odr_subtypes_equivalent_p (TREE_TYPE (t1), TREE_TYPE (t2),
visited, loc1, loc2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("has different return value "
"in another translation unit"));
if (warn && warned)
warn_types_mismatch (TREE_TYPE (t1), TREE_TYPE (t2), loc1, loc2);
return false;
}
if (TYPE_ARG_TYPES (t1) == TYPE_ARG_TYPES (t2)
|| !prototype_p (t1) || !prototype_p (t2))
return type_variants_equivalent_p (t1, t2);
else
{
tree parms1, parms2;
for (parms1 = TYPE_ARG_TYPES (t1), parms2 = TYPE_ARG_TYPES (t2);
parms1 && parms2;
parms1 = TREE_CHAIN (parms1), parms2 = TREE_CHAIN (parms2))
{
if (!odr_subtypes_equivalent_p
(TREE_VALUE (parms1), TREE_VALUE (parms2),
visited, loc1, loc2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("has different parameters in another "
"translation unit"));
if (warn && warned)
warn_types_mismatch (TREE_VALUE (parms1),
TREE_VALUE (parms2), loc1, loc2);
return false;
}
}
if (parms1 || parms2)
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("has different parameters "
"in another translation unit"));
return false;
}
return type_variants_equivalent_p (t1, t2);
}
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
{
tree f1, f2;
/* For aggregate types, all the fields must be the same. */
if (COMPLETE_TYPE_P (t1) && COMPLETE_TYPE_P (t2))
{
if (TYPE_BINFO (t1) && TYPE_BINFO (t2)
&& polymorphic_type_binfo_p (TYPE_BINFO (t1))
!= polymorphic_type_binfo_p (TYPE_BINFO (t2)))
{
if (polymorphic_type_binfo_p (TYPE_BINFO (t1)))
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type defined in another translation unit "
"is not polymorphic"));
else
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type defined in another translation unit "
"is polymorphic"));
return false;
}
for (f1 = TYPE_FIELDS (t1), f2 = TYPE_FIELDS (t2);
f1 || f2;
f1 = TREE_CHAIN (f1), f2 = TREE_CHAIN (f2))
{
/* Skip non-fields. */
while (f1 && skip_in_fields_list_p (f1))
f1 = TREE_CHAIN (f1);
while (f2 && skip_in_fields_list_p (f2))
f2 = TREE_CHAIN (f2);
if (!f1 || !f2)
break;
if (DECL_VIRTUAL_P (f1) != DECL_VIRTUAL_P (f2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different virtual table pointers"
" is defined in another translation unit"));
return false;
}
if (DECL_ARTIFICIAL (f1) != DECL_ARTIFICIAL (f2))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different bases is defined "
"in another translation unit"));
return false;
}
if (DECL_NAME (f1) != DECL_NAME (f2)
&& !DECL_ARTIFICIAL (f1))
{
warn_odr (t1, t2, f1, f2, warn, warned,
G_("a field with different name is defined "
"in another translation unit"));
return false;
}
if (!odr_subtypes_equivalent_p (TREE_TYPE (f1),
TREE_TYPE (f2),
visited, loc1, loc2))
{
/* Do not warn about artificial fields and just go into
generic field mismatch warning. */
if (DECL_ARTIFICIAL (f1))
break;
warn_odr (t1, t2, f1, f2, warn, warned,
G_("a field of same name but different type "
"is defined in another translation unit"));
if (warn && warned)
warn_types_mismatch (TREE_TYPE (f1), TREE_TYPE (f2), loc1, loc2);
return false;
}
if (!gimple_compare_field_offset (f1, f2))
{
/* Do not warn about artificial fields and just go into
generic field mismatch warning. */
if (DECL_ARTIFICIAL (f1))
break;
warn_odr (t1, t2, f1, f2, warn, warned,
G_("fields have different layout "
"in another translation unit"));
return false;
}
if (DECL_BIT_FIELD (f1) != DECL_BIT_FIELD (f2))
{
warn_odr (t1, t2, f1, f2, warn, warned,
G_("one field is a bitfield while the other "
"is not"));
return false;
}
else
gcc_assert (DECL_NONADDRESSABLE_P (f1)
== DECL_NONADDRESSABLE_P (f2));
}
/* If one aggregate has more fields than the other, they
are not the same. */
if (f1 || f2)
{
if ((f1 && DECL_VIRTUAL_P (f1)) || (f2 && DECL_VIRTUAL_P (f2)))
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different virtual table pointers"
" is defined in another translation unit"));
else if ((f1 && DECL_ARTIFICIAL (f1))
|| (f2 && DECL_ARTIFICIAL (f2)))
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different bases is defined "
"in another translation unit"));
else
warn_odr (t1, t2, f1, f2, warn, warned,
G_("a type with different number of fields "
"is defined in another translation unit"));
return false;
}
}
break;
}
case VOID_TYPE:
case NULLPTR_TYPE:
break;
default:
debug_tree (t1);
gcc_unreachable ();
}
/* Those are better to come last as they are utterly uninformative. */
if (TYPE_SIZE (t1) && TYPE_SIZE (t2)
&& !operand_equal_p (TYPE_SIZE (t1), TYPE_SIZE (t2), 0))
{
warn_odr (t1, t2, NULL, NULL, warn, warned,
G_("a type with different size "
"is defined in another translation unit"));
return false;
}
gcc_assert (!TYPE_SIZE_UNIT (t1) || !TYPE_SIZE_UNIT (t2)
|| operand_equal_p (TYPE_SIZE_UNIT (t1),
TYPE_SIZE_UNIT (t2), 0));
return type_variants_equivalent_p (t1, t2);
}
/* Return true if TYPE1 and TYPE2 are equivalent for One Definition Rule. */
bool
odr_types_equivalent_p (tree type1, tree type2)
{
gcc_checking_assert (odr_or_derived_type_p (type1)
&& odr_or_derived_type_p (type2));
hash_set<type_pair> visited;
return odr_types_equivalent_p (type1, type2, false, NULL,
&visited, UNKNOWN_LOCATION, UNKNOWN_LOCATION);
}
/* TYPE is equivalent to VAL by ODR, but its tree representation differs
from VAL->type. This may happen in LTO where tree merging did not merge
all variants of the same type or due to ODR violation.
Analyze and report ODR violations and add type to duplicate list.
If TYPE is more specified than VAL->type, prevail VAL->type. Also if
this is first time we see definition of a class return true so the
base types are analyzed. */
static bool
add_type_duplicate (odr_type val, tree type)
{
bool build_bases = false;
bool prevail = false;
bool odr_must_violate = false;
if (!val->types_set)
val->types_set = new hash_set<tree>;
/* Chose polymorphic type as leader (this happens only in case of ODR
violations. */
if ((TREE_CODE (type) == RECORD_TYPE && TYPE_BINFO (type)
&& polymorphic_type_binfo_p (TYPE_BINFO (type)))
&& (TREE_CODE (val->type) != RECORD_TYPE || !TYPE_BINFO (val->type)
|| !polymorphic_type_binfo_p (TYPE_BINFO (val->type))))
{
prevail = true;
build_bases = true;
}
/* Always prefer complete type to be the leader. */
else if (!COMPLETE_TYPE_P (val->type) && COMPLETE_TYPE_P (type))
{
prevail = true;
if (TREE_CODE (type) == RECORD_TYPE)
build_bases = TYPE_BINFO (type);
}
else if (COMPLETE_TYPE_P (val->type) && !COMPLETE_TYPE_P (type))
;
else if (TREE_CODE (val->type) == ENUMERAL_TYPE
&& TREE_CODE (type) == ENUMERAL_TYPE
&& !TYPE_VALUES (val->type) && TYPE_VALUES (type))
prevail = true;
else if (TREE_CODE (val->type) == RECORD_TYPE
&& TREE_CODE (type) == RECORD_TYPE
&& TYPE_BINFO (type) && !TYPE_BINFO (val->type))
{
gcc_assert (!val->bases.length ());
build_bases = true;
prevail = true;
}
if (prevail)
std::swap (val->type, type);
val->types_set->add (type);
/* If we now have a mangled name, be sure to record it to val->type
so ODR hash can work. */
if (can_be_name_hashed_p (type) && !can_be_name_hashed_p (val->type))
SET_DECL_ASSEMBLER_NAME (TYPE_NAME (val->type),
DECL_ASSEMBLER_NAME (TYPE_NAME (type)));
bool merge = true;
bool base_mismatch = false;
unsigned int i;
bool warned = false;
hash_set<type_pair> visited;
gcc_assert (in_lto_p);
vec_safe_push (val->types, type);
/* If both are class types, compare the bases. */
if (COMPLETE_TYPE_P (type) && COMPLETE_TYPE_P (val->type)
&& TREE_CODE (val->type) == RECORD_TYPE
&& TREE_CODE (type) == RECORD_TYPE
&& TYPE_BINFO (val->type) && TYPE_BINFO (type))
{
if (BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
!= BINFO_N_BASE_BINFOS (TYPE_BINFO (val->type)))
{
if (!flag_ltrans && !warned && !val->odr_violated)
{
tree extra_base;
warn_odr (type, val->type, NULL, NULL, !warned, &warned,
"a type with the same name but different "
"number of polymorphic bases is "
"defined in another translation unit");
if (warned)
{
if (BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
> BINFO_N_BASE_BINFOS (TYPE_BINFO (val->type)))
extra_base = BINFO_BASE_BINFO
(TYPE_BINFO (type),
BINFO_N_BASE_BINFOS (TYPE_BINFO (val->type)));
else
extra_base = BINFO_BASE_BINFO
(TYPE_BINFO (val->type),
BINFO_N_BASE_BINFOS (TYPE_BINFO (type)));
tree extra_base_type = BINFO_TYPE (extra_base);
inform (DECL_SOURCE_LOCATION (TYPE_NAME (extra_base_type)),
"the extra base is defined here");
}
}
base_mismatch = true;
}
else
for (i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); i++)
{
tree base1 = BINFO_BASE_BINFO (TYPE_BINFO (type), i);
tree base2 = BINFO_BASE_BINFO (TYPE_BINFO (val->type), i);
tree type1 = BINFO_TYPE (base1);
tree type2 = BINFO_TYPE (base2);
if (types_odr_comparable (type1, type2))
{
if (!types_same_for_odr (type1, type2))
base_mismatch = true;
}
else
if (!odr_types_equivalent_p (type1, type2))
base_mismatch = true;
if (base_mismatch)
{
if (!warned && !val->odr_violated)
{
warn_odr (type, val->type, NULL, NULL,
!warned, &warned,
"a type with the same name but different base "
"type is defined in another translation unit");
if (warned)
warn_types_mismatch (type1, type2,
UNKNOWN_LOCATION, UNKNOWN_LOCATION);
}
break;
}
if (BINFO_OFFSET (base1) != BINFO_OFFSET (base2))
{
base_mismatch = true;
if (!warned && !val->odr_violated)
warn_odr (type, val->type, NULL, NULL,
!warned, &warned,
"a type with the same name but different base "
"layout is defined in another translation unit");
break;
}
/* One of bases is not of complete type. */
if (!TYPE_BINFO (type1) != !TYPE_BINFO (type2))
{
/* If we have a polymorphic type info specified for TYPE1
but not for TYPE2 we possibly missed a base when recording
VAL->type earlier.
Be sure this does not happen. */
if (TYPE_BINFO (type1)
&& polymorphic_type_binfo_p (TYPE_BINFO (type1))
&& !build_bases)
odr_must_violate = true;
break;
}
/* One base is polymorphic and the other not.
This ought to be diagnosed earlier, but do not ICE in the
checking bellow. */
else if (TYPE_BINFO (type1)
&& polymorphic_type_binfo_p (TYPE_BINFO (type1))
!= polymorphic_type_binfo_p (TYPE_BINFO (type2)))
{
if (!warned && !val->odr_violated)
warn_odr (type, val->type, NULL, NULL,
!warned, &warned,
"a base of the type is polymorphic only in one "
"translation unit");
base_mismatch = true;
break;
}
}
if (base_mismatch)
{
merge = false;
odr_violation_reported = true;
val->odr_violated = true;
if (symtab->dump_file)
{
fprintf (symtab->dump_file, "ODR base violation\n");
print_node (symtab->dump_file, "", val->type, 0);
putc ('\n',symtab->dump_file);
print_node (symtab->dump_file, "", type, 0);
putc ('\n',symtab->dump_file);
}
}
}
/* Next compare memory layout.
The DECL_SOURCE_LOCATIONs in this invocation came from LTO streaming.
We must apply the location cache to ensure that they are valid
before we can pass them to odr_types_equivalent_p (PR lto/83121). */
if (lto_location_cache::current_cache)
lto_location_cache::current_cache->apply_location_cache ();
/* As a special case we stream mangles names of integer types so we can see
if they are believed to be same even though they have different
representation. Avoid bogus warning on mismatches in these. */
if (TREE_CODE (type) != INTEGER_TYPE
&& TREE_CODE (val->type) != INTEGER_TYPE
&& !odr_types_equivalent_p (val->type, type,
!flag_ltrans && !val->odr_violated && !warned,
&warned, &visited,
DECL_SOURCE_LOCATION (TYPE_NAME (val->type)),
DECL_SOURCE_LOCATION (TYPE_NAME (type))))
{
merge = false;
odr_violation_reported = true;
val->odr_violated = true;
}
gcc_assert (val->odr_violated || !odr_must_violate);
/* Sanity check that all bases will be build same way again. */
if (flag_checking
&& COMPLETE_TYPE_P (type) && COMPLETE_TYPE_P (val->type)
&& TREE_CODE (val->type) == RECORD_TYPE
&& TREE_CODE (type) == RECORD_TYPE
&& TYPE_BINFO (val->type) && TYPE_BINFO (type)
&& !val->odr_violated
&& !base_mismatch && val->bases.length ())
{
unsigned int num_poly_bases = 0;
unsigned int j;
for (i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); i++)
if (polymorphic_type_binfo_p (BINFO_BASE_BINFO
(TYPE_BINFO (type), i)))
num_poly_bases++;
gcc_assert (num_poly_bases == val->bases.length ());
for (j = 0, i = 0; i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type));
i++)
if (polymorphic_type_binfo_p (BINFO_BASE_BINFO
(TYPE_BINFO (type), i)))
{
odr_type base = get_odr_type
(BINFO_TYPE
(BINFO_BASE_BINFO (TYPE_BINFO (type),
i)),
true);
gcc_assert (val->bases[j] == base);
j++;
}
}
/* Regularize things a little. During LTO same types may come with
different BINFOs. Either because their virtual table was
not merged by tree merging and only later at decl merging or
because one type comes with external vtable, while other
with internal. We want to merge equivalent binfos to conserve
memory and streaming overhead.
The external vtables are more harmful: they contain references
to external declarations of methods that may be defined in the
merged LTO unit. For this reason we absolutely need to remove
them and replace by internal variants. Not doing so will lead
to incomplete answers from possible_polymorphic_call_targets.
FIXME: disable for now; because ODR types are now build during
streaming in, the variants do not need to be linked to the type,
yet. We need to do the merging in cleanup pass to be implemented
soon. */
if (!flag_ltrans && merge
&& 0
&& TREE_CODE (val->type) == RECORD_TYPE
&& TREE_CODE (type) == RECORD_TYPE
&& TYPE_BINFO (val->type) && TYPE_BINFO (type)
&& TYPE_MAIN_VARIANT (type) == type
&& TYPE_MAIN_VARIANT (val->type) == val->type
&& BINFO_VTABLE (TYPE_BINFO (val->type))
&& BINFO_VTABLE (TYPE_BINFO (type)))
{
tree master_binfo = TYPE_BINFO (val->type);
tree v1 = BINFO_VTABLE (master_binfo);
tree v2 = BINFO_VTABLE (TYPE_BINFO (type));
if (TREE_CODE (v1) == POINTER_PLUS_EXPR)
{
gcc_assert (TREE_CODE (v2) == POINTER_PLUS_EXPR
&& operand_equal_p (TREE_OPERAND (v1, 1),
TREE_OPERAND (v2, 1), 0));
v1 = TREE_OPERAND (TREE_OPERAND (v1, 0), 0);
v2 = TREE_OPERAND (TREE_OPERAND (v2, 0), 0);
}
gcc_assert (DECL_ASSEMBLER_NAME (v1)
== DECL_ASSEMBLER_NAME (v2));
if (DECL_EXTERNAL (v1) && !DECL_EXTERNAL (v2))
{
unsigned int i;
set_type_binfo (val->type, TYPE_BINFO (type));
for (i = 0; i < val->types->length (); i++)
{
if (TYPE_BINFO ((*val->types)[i])
== master_binfo)
set_type_binfo ((*val->types)[i], TYPE_BINFO (type));
}
BINFO_TYPE (TYPE_BINFO (type)) = val->type;
}
else
set_type_binfo (type, master_binfo);
}
return build_bases;
}
/* REF is OBJ_TYPE_REF, return the class the ref corresponds to. */
tree
obj_type_ref_class (const_tree ref)
{
gcc_checking_assert (TREE_CODE (ref) == OBJ_TYPE_REF);
ref = TREE_TYPE (ref);
gcc_checking_assert (TREE_CODE (ref) == POINTER_TYPE);
ref = TREE_TYPE (ref);
/* We look for type THIS points to. ObjC also builds
OBJ_TYPE_REF with non-method calls, Their first parameter
ID however also corresponds to class type. */
gcc_checking_assert (TREE_CODE (ref) == METHOD_TYPE
|| TREE_CODE (ref) == FUNCTION_TYPE);
ref = TREE_VALUE (TYPE_ARG_TYPES (ref));
gcc_checking_assert (TREE_CODE (ref) == POINTER_TYPE);
tree ret = TREE_TYPE (ref);
if (!in_lto_p)
ret = TYPE_CANONICAL (ret);
else
ret = get_odr_type (ret)->type;
return ret;
}
/* Get ODR type hash entry for TYPE. If INSERT is true, create
possibly new entry. */
odr_type
get_odr_type (tree type, bool insert)
{
odr_type_d **slot = NULL;
odr_type_d **vtable_slot = NULL;
odr_type val = NULL;
hashval_t hash;
bool build_bases = false;
bool insert_to_odr_array = false;
int base_id = -1;
type = TYPE_MAIN_VARIANT (type);
if (!in_lto_p)
type = TYPE_CANONICAL (type);
gcc_checking_assert (can_be_name_hashed_p (type)
|| can_be_vtable_hashed_p (type));
/* Lookup entry, first try name hash, fallback to vtable hash. */
if (can_be_name_hashed_p (type))
{
hash = hash_odr_name (type);
slot = odr_hash->find_slot_with_hash (type, hash,
insert ? INSERT : NO_INSERT);
}
if ((!slot || !*slot) && in_lto_p && can_be_vtable_hashed_p (type))
{
hash = hash_odr_vtable (type);
if (!odr_vtable_hash)
odr_vtable_hash = new odr_vtable_hash_type (23);
vtable_slot = odr_vtable_hash->find_slot_with_hash (type, hash,
insert ? INSERT : NO_INSERT);
}
if (!slot && !vtable_slot)
return NULL;
/* See if we already have entry for type. */
if ((slot && *slot) || (vtable_slot && *vtable_slot))
{
if (slot && *slot)
{
val = *slot;
if (flag_checking
&& in_lto_p && can_be_vtable_hashed_p (type))
{
hash = hash_odr_vtable (type);
vtable_slot = odr_vtable_hash->find_slot_with_hash (type, hash,
NO_INSERT);
gcc_assert (!vtable_slot || *vtable_slot == *slot);
vtable_slot = NULL;
}
}
else if (*vtable_slot)
val = *vtable_slot;
if (val->type != type && insert
&& (!val->types_set || !val->types_set->add (type)))
{
/* We have type duplicate, but it may introduce vtable name or
mangled name; be sure to keep hashes in sync. */
if (in_lto_p && can_be_vtable_hashed_p (type)
&& (!vtable_slot || !*vtable_slot))
{
if (!vtable_slot)
{
hash = hash_odr_vtable (type);
vtable_slot = odr_vtable_hash->find_slot_with_hash
(type, hash, INSERT);
gcc_checking_assert (!*vtable_slot || *vtable_slot == val);
}
*vtable_slot = val;
}
if (slot && !*slot)
*slot = val;
build_bases = add_type_duplicate (val, type);
}
}
else
{
val = ggc_cleared_alloc<odr_type_d> ();
val->type = type;
val->bases = vNULL;
val->derived_types = vNULL;
if (type_with_linkage_p (type))
val->anonymous_namespace = type_in_anonymous_namespace_p (type);
else
val->anonymous_namespace = 0;
build_bases = COMPLETE_TYPE_P (val->type);
insert_to_odr_array = true;
if (slot)
*slot = val;
if (vtable_slot)
*vtable_slot = val;
}
if (build_bases && TREE_CODE (type) == RECORD_TYPE && TYPE_BINFO (type)
&& type_with_linkage_p (type)
&& type == TYPE_MAIN_VARIANT (type))
{
tree binfo = TYPE_BINFO (type);
unsigned int i;
gcc_assert (BINFO_TYPE (TYPE_BINFO (val->type)) == type);
val->all_derivations_known = type_all_derivations_known_p (type);
for (i = 0; i < BINFO_N_BASE_BINFOS (binfo); i++)
/* For now record only polymorphic types. other are
pointless for devirtualization and we cannot precisely
determine ODR equivalency of these during LTO. */
if (polymorphic_type_binfo_p (BINFO_BASE_BINFO (binfo, i)))
{
tree base_type= BINFO_TYPE (BINFO_BASE_BINFO (binfo, i));
odr_type base = get_odr_type (base_type, true);
gcc_assert (TYPE_MAIN_VARIANT (base_type) == base_type);
base->derived_types.safe_push (val);
val->bases.safe_push (base);
if (base->id > base_id)
base_id = base->id;
}
}
/* Ensure that type always appears after bases. */
if (insert_to_odr_array)
{
if (odr_types_ptr)
val->id = odr_types.length ();
vec_safe_push (odr_types_ptr, val);
}
else if (base_id > val->id)
{
odr_types[val->id] = 0;
/* Be sure we did not recorded any derived types; these may need
renumbering too. */
gcc_assert (val->derived_types.length() == 0);
val->id = odr_types.length ();
vec_safe_push (odr_types_ptr, val);
}
return val;
}
bool
odr_type_violation_reported_p (tree type)
{
return get_odr_type (type, false)->odr_violated;
}
/* Add TYPE od ODR type hash. */
void
register_odr_type (tree type)
{
if (!odr_hash)
{
odr_hash = new odr_hash_type (23);
if (in_lto_p)
odr_vtable_hash = new odr_vtable_hash_type (23);
}
if (type == TYPE_MAIN_VARIANT (type))
{
/* To get ODR warings right, first register all sub-types. */
if (RECORD_OR_UNION_TYPE_P (type)
&& COMPLETE_TYPE_P (type))
{
/* Limit recursion on types which are already registered. */
odr_type ot = get_odr_type (type, false);
if (ot
&& (ot->type == type
|| (ot->types_set
&& ot->types_set->contains (type))))
return;
for (tree f = TYPE_FIELDS (type); f; f = TREE_CHAIN (f))
if (TREE_CODE (f) == FIELD_DECL)
{
tree subtype = TREE_TYPE (f);
while (TREE_CODE (subtype) == ARRAY_TYPE)
subtype = TREE_TYPE (subtype);
if (type_with_linkage_p (TYPE_MAIN_VARIANT (subtype)))
register_odr_type (TYPE_MAIN_VARIANT (subtype));
}
if (TYPE_BINFO (type))
for (unsigned int i = 0;
i < BINFO_N_BASE_BINFOS (TYPE_BINFO (type)); i++)
register_odr_type (BINFO_TYPE (BINFO_BASE_BINFO
(TYPE_BINFO (type), i)));
}
get_odr_type (type, true);
}
}
/* Return true if type is known to have no derivations. */
bool
type_known_to_have_no_derivations_p (tree t)
{
return (type_all_derivations_known_p (t)
&& (TYPE_FINAL_P (t)
|| (odr_hash
&& !get_odr_type (t, true)->derived_types.length())));
}
/* Dump ODR type T and all its derived types. INDENT specifies indentation for
recursive printing. */
static void
dump_odr_type (FILE *f, odr_type t, int indent=0)
{
unsigned int i;
fprintf (f, "%*s type %i: ", indent * 2, "", t->id);
print_generic_expr (f, t->type, TDF_SLIM);
fprintf (f, "%s", t->anonymous_namespace ? " (anonymous namespace)":"");
fprintf (f, "%s\n", t->all_derivations_known ? " (derivations known)":"");
if (TYPE_NAME (t->type))
{
/*fprintf (f, "%*s defined at: %s:%i\n", indent * 2, "",
DECL_SOURCE_FILE (TYPE_NAME (t->type)),
DECL_SOURCE_LINE (TYPE_NAME (t->type)));*/
if (DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t->type)))
fprintf (f, "%*s mangled name: %s\n", indent * 2, "",
IDENTIFIER_POINTER
(DECL_ASSEMBLER_NAME (TYPE_NAME (t->type))));
}
if (t->bases.length ())
{
fprintf (f, "%*s base odr type ids: ", indent * 2, "");
for (i = 0; i < t->bases.length (); i++)
fprintf (f, " %i", t->bases[i]->id);
fprintf (f, "\n");
}
if (t->derived_types.length ())
{
fprintf (f, "%*s derived types:\n", indent * 2, "");
for (i = 0; i < t->derived_types.length (); i++)
dump_odr_type (f, t->derived_types[i], indent + 1);
}
fprintf (f, "\n");
}
/* Dump the type inheritance graph. */
static void
dump_type_inheritance_graph (FILE *f)
{
unsigned int i;
unsigned int num_all_types = 0, num_types = 0, num_duplicates = 0;
if (!odr_types_ptr)
return;
fprintf (f, "\n\nType inheritance graph:\n");
for (i = 0; i < odr_types.length (); i++)
{
if (odr_types[i] && odr_types[i]->bases.length () == 0)
dump_odr_type (f, odr_types[i]);
}
for (i = 0; i < odr_types.length (); i++)
{
if (!odr_types[i])
continue;
num_all_types++;
if (!odr_types[i]->types || !odr_types[i]->types->length ())
continue;
/* To aid ODR warnings we also mangle integer constants but do
not consinder duplicates there. */
if (TREE_CODE (odr_types[i]->type) == INTEGER_TYPE)
continue;
/* It is normal to have one duplicate and one normal variant. */
if (odr_types[i]->types->length () == 1
&& COMPLETE_TYPE_P (odr_types[i]->type)
&& !COMPLETE_TYPE_P ((*odr_types[i]->types)[0]))
continue;
num_types ++;
unsigned int j;
fprintf (f, "Duplicate tree types for odr type %i\n", i);
print_node (f, "", odr_types[i]->type, 0);
print_node (f, "", TYPE_NAME (odr_types[i]->type), 0);
putc ('\n',f);
for (j = 0; j < odr_types[i]->types->length (); j++)
{
tree t;
num_duplicates ++;
fprintf (f, "duplicate #%i\n", j);
print_node (f, "", (*odr_types[i]->types)[j], 0);
t = (*odr_types[i]->types)[j];
while (TYPE_P (t) && TYPE_CONTEXT (t))
{
t = TYPE_CONTEXT (t);
print_node (f, "", t, 0);
}
print_node (f, "", TYPE_NAME ((*odr_types[i]->types)[j]), 0);
putc ('\n',f);
}
}
fprintf (f, "Out of %i types there are %i types with duplicates; "
"%i duplicates overall\n", num_all_types, num_types, num_duplicates);
}
/* Save some WPA->ltrans streaming by freeing stuff needed only for good
ODR warnings.
We free TYPE_VALUES of enums and also make TYPE_DECLs to not point back
to the type (which is needed to keep them in the same SCC and preserve
location information to output warnings) and subsequently we make all
TYPE_DECLS of same assembler name equivalent. */
static void
free_odr_warning_data ()
{
static bool odr_data_freed = false;
if (odr_data_freed || !flag_wpa || !odr_types_ptr)
return;
odr_data_freed = true;
for (unsigned int i = 0; i < odr_types.length (); i++)
if (odr_types[i])
{
tree t = odr_types[i]->type;
if (TREE_CODE (t) == ENUMERAL_TYPE)
TYPE_VALUES (t) = NULL;
TREE_TYPE (TYPE_NAME (t)) = void_type_node;
if (odr_types[i]->types)
for (unsigned int j = 0; j < odr_types[i]->types->length (); j++)
{
tree td = (*odr_types[i]->types)[j];
if (TREE_CODE (td) == ENUMERAL_TYPE)
TYPE_VALUES (td) = NULL;
TYPE_NAME (td) = TYPE_NAME (t);
}
}
odr_data_freed = true;
}
/* Initialize IPA devirt and build inheritance tree graph. */
void
build_type_inheritance_graph (void)
{
struct symtab_node *n;
FILE *inheritance_dump_file;
dump_flags_t flags;
if (odr_hash)
{
free_odr_warning_data ();
return;
}
timevar_push (TV_IPA_INHERITANCE);
inheritance_dump_file = dump_begin (TDI_inheritance, &flags);
odr_hash = new odr_hash_type (23);
if (in_lto_p)
odr_vtable_hash = new odr_vtable_hash_type (23);
/* We reconstruct the graph starting of types of all methods seen in the
unit. */
FOR_EACH_SYMBOL (n)
if (is_a <cgraph_node *> (n)
&& DECL_VIRTUAL_P (n->decl)
&& n->real_symbol_p ())
get_odr_type (TYPE_METHOD_BASETYPE (TREE_TYPE (n->decl)), true);
/* Look also for virtual tables of types that do not define any methods.
We need it in a case where class B has virtual base of class A
re-defining its virtual method and there is class C with no virtual
methods with B as virtual base.
Here we output B's virtual method in two variant - for non-virtual
and virtual inheritance. B's virtual table has non-virtual version,
while C's has virtual.
For this reason we need to know about C in order to include both
variants of B. More correctly, record_target_from_binfo should
add both variants of the method when walking B, but we have no
link in between them.
We rely on fact that either the method is exported and thus we
assume it is called externally or C is in anonymous namespace and
thus we will see the vtable. */
else if (is_a <varpool_node *> (n)
&& DECL_VIRTUAL_P (n->decl)
&& TREE_CODE (DECL_CONTEXT (n->decl)) == RECORD_TYPE
&& TYPE_BINFO (DECL_CONTEXT (n->decl))
&& polymorphic_type_binfo_p (TYPE_BINFO (DECL_CONTEXT (n->decl))))
get_odr_type (TYPE_MAIN_VARIANT (DECL_CONTEXT (n->decl)), true);
if (inheritance_dump_file)
{
dump_type_inheritance_graph (inheritance_dump_file);
dump_end (TDI_inheritance, inheritance_dump_file);
}
free_odr_warning_data ();
timevar_pop (TV_IPA_INHERITANCE);
}
/* Return true if N has reference from live virtual table
(and thus can be a destination of polymorphic call).
Be conservatively correct when callgraph is not built or
if the method may be referred externally. */
static bool
referenced_from_vtable_p (struct cgraph_node *node)
{
int i;
struct ipa_ref *ref;
bool found = false;
if (node->externally_visible
|| DECL_EXTERNAL (node->decl)
|| node->used_from_other_partition)
return true;
/* Keep this test constant time.
It is unlikely this can happen except for the case where speculative
devirtualization introduced many speculative edges to this node.
In this case the target is very likely alive anyway. */
if (node->ref_list.referring.length () > 100)
return true;
/* We need references built. */
if (symtab->state <= CONSTRUCTION)
return true;
for (i = 0; node->iterate_referring (i, ref); i++)
if ((ref->use == IPA_REF_ALIAS
&& referenced_from_vtable_p (dyn_cast<cgraph_node *> (ref->referring)))
|| (ref->use == IPA_REF_ADDR
&& VAR_P (ref->referring->decl)
&& DECL_VIRTUAL_P (ref->referring->decl)))
{
found = true;
break;
}
return found;
}
/* Return if TARGET is cxa_pure_virtual. */
static bool
is_cxa_pure_virtual_p (tree target)
{
return target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE
&& DECL_NAME (target)
&& id_equal (DECL_NAME (target),
"__cxa_pure_virtual");
}
/* If TARGET has associated node, record it in the NODES array.
CAN_REFER specify if program can refer to the target directly.
if TARGET is unknown (NULL) or it cannot be inserted (for example because
its body was already removed and there is no way to refer to it), clear
COMPLETEP. */
static void
maybe_record_node (vec <cgraph_node *> &nodes,
tree target, hash_set<tree> *inserted,
bool can_refer,
bool *completep)
{
struct cgraph_node *target_node, *alias_target;
enum availability avail;
bool pure_virtual = is_cxa_pure_virtual_p (target);
/* __builtin_unreachable do not need to be added into
list of targets; the runtime effect of calling them is undefined.
Only "real" virtual methods should be accounted. */
if (target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE && !pure_virtual)
return;
if (!can_refer)
{
/* The only case when method of anonymous namespace becomes unreferable
is when we completely optimized it out. */
if (flag_ltrans
|| !target
|| !type_in_anonymous_namespace_p (DECL_CONTEXT (target)))
*completep = false;
return;
}
if (!target)
return;
target_node = cgraph_node::get (target);
/* Prefer alias target over aliases, so we do not get confused by
fake duplicates. */
if (target_node)
{
alias_target = target_node->ultimate_alias_target (&avail);
if (target_node != alias_target
&& avail >= AVAIL_AVAILABLE
&& target_node->get_availability ())
target_node = alias_target;
}
/* Method can only be called by polymorphic call if any
of vtables referring to it are alive.
While this holds for non-anonymous functions, too, there are
cases where we want to keep them in the list; for example
inline functions with -fno-weak are static, but we still
may devirtualize them when instance comes from other unit.
The same holds for LTO.
Currently we ignore these functions in speculative devirtualization.
??? Maybe it would make sense to be more aggressive for LTO even
elsewhere. */
if (!flag_ltrans
&& !pure_virtual
&& type_in_anonymous_namespace_p (DECL_CONTEXT (target))
&& (!target_node
|| !referenced_from_vtable_p (target_node)))
;
/* See if TARGET is useful function we can deal with. */
else if (target_node != NULL
&& (TREE_PUBLIC (target)
|| DECL_EXTERNAL (target)
|| target_node->definition)
&& target_node->real_symbol_p ())
{
gcc_assert (!target_node->global.inlined_to);
gcc_assert (target_node->real_symbol_p ());
/* When sanitizing, do not assume that __cxa_pure_virtual is not called
by valid program. */
if (flag_sanitize & SANITIZE_UNREACHABLE)
;
/* Only add pure virtual if it is the only possible target. This way
we will preserve the diagnostics about pure virtual called in many
cases without disabling optimization in other. */
else if (pure_virtual)
{
if (nodes.length ())
return;
}
/* If we found a real target, take away cxa_pure_virtual. */
else if (!pure_virtual && nodes.length () == 1
&& is_cxa_pure_virtual_p (nodes[0]->decl))
nodes.pop ();
if (pure_virtual && nodes.length ())
return;
if (!inserted->add (target))
{
cached_polymorphic_call_targets->add (target_node);
nodes.safe_push (target_node);
}
}
else if (!completep)
;
/* We have definition of __cxa_pure_virtual that is not accessible (it is
optimized out or partitioned to other unit) so we cannot add it. When
not sanitizing, there is nothing to do.
Otherwise declare the list incomplete. */
else if (pure_virtual)
{
if (flag_sanitize & SANITIZE_UNREACHABLE)
*completep = false;
}
else if (flag_ltrans
|| !type_in_anonymous_namespace_p (DECL_CONTEXT (target)))
*completep = false;
}
/* See if BINFO's type matches OUTER_TYPE. If so, look up
BINFO of subtype of OTR_TYPE at OFFSET and in that BINFO find
method in vtable and insert method to NODES array
or BASES_TO_CONSIDER if this array is non-NULL.
Otherwise recurse to base BINFOs.
This matches what get_binfo_at_offset does, but with offset
being unknown.
TYPE_BINFOS is a stack of BINFOS of types with defined
virtual table seen on way from class type to BINFO.
MATCHED_VTABLES tracks virtual tables we already did lookup
for virtual function in. INSERTED tracks nodes we already
inserted.
ANONYMOUS is true if BINFO is part of anonymous namespace.
Clear COMPLETEP when we hit unreferable target.
*/
static void
record_target_from_binfo (vec <cgraph_node *> &nodes,
vec <tree> *bases_to_consider,
tree binfo,
tree otr_type,
vec <tree> &type_binfos,
HOST_WIDE_INT otr_token,
tree outer_type,
HOST_WIDE_INT offset,
hash_set<tree> *inserted,
hash_set<tree> *matched_vtables,
bool anonymous,
bool *completep)
{
tree type = BINFO_TYPE (binfo);
int i;
tree base_binfo;
if (BINFO_VTABLE (binfo))
type_binfos.safe_push (binfo);
if (types_same_for_odr (type, outer_type))
{
int i;
tree type_binfo = NULL;
/* Look up BINFO with virtual table. For normal types it is always last
binfo on stack. */
for (i = type_binfos.length () - 1; i >= 0; i--)
if (BINFO_OFFSET (type_binfos[i]) == BINFO_OFFSET (binfo))
{
type_binfo = type_binfos[i];
break;
}
if (BINFO_VTABLE (binfo))
type_binfos.pop ();
/* If this is duplicated BINFO for base shared by virtual inheritance,
we may not have its associated vtable. This is not a problem, since
we will walk it on the other path. */
if (!type_binfo)
return;
tree inner_binfo = get_binfo_at_offset (type_binfo,
offset, otr_type);
if (!inner_binfo)
{
gcc_assert (odr_violation_reported);
return;
}
/* For types in anonymous namespace first check if the respective vtable
is alive. If not, we know the type can't be called. */
if (!flag_ltrans && anonymous)
{
tree vtable = BINFO_VTABLE (inner_binfo);
varpool_node *vnode;
if (TREE_CODE (vtable) == POINTER_PLUS_EXPR)
vtable = TREE_OPERAND (TREE_OPERAND (vtable, 0), 0);
vnode = varpool_node::get (vtable);
if (!vnode || !vnode->definition)
return;
}
gcc_assert (inner_binfo);
if (bases_to_consider
? !matched_vtables->contains (BINFO_VTABLE (inner_binfo))
: !matched_vtables->add (BINFO_VTABLE (inner_binfo)))
{
bool can_refer;
tree target = gimple_get_virt_method_for_binfo (otr_token,
inner_binfo,
&can_refer);
if (!bases_to_consider)
maybe_record_node (nodes, target, inserted, can_refer, completep);
/* Destructors are never called via construction vtables. */
else if (!target || !DECL_CXX_DESTRUCTOR_P (target))
bases_to_consider->safe_push (target);
}
return;
}
/* Walk bases. */
for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
/* Walking bases that have no virtual method is pointless exercise. */
if (polymorphic_type_binfo_p (base_binfo))
record_target_from_binfo (nodes, bases_to_consider, base_binfo, otr_type,
type_binfos,
otr_token, outer_type, offset, inserted,
matched_vtables, anonymous, completep);
if (BINFO_VTABLE (binfo))
type_binfos.pop ();
}
/* Look up virtual methods matching OTR_TYPE (with OFFSET and OTR_TOKEN)
of TYPE, insert them to NODES, recurse into derived nodes.
INSERTED is used to avoid duplicate insertions of methods into NODES.
MATCHED_VTABLES are used to avoid duplicate walking vtables.
Clear COMPLETEP if unreferable target is found.
If CONSIDER_CONSTRUCTION is true, record to BASES_TO_CONSIDER
all cases where BASE_SKIPPED is true (because the base is abstract
class). */
static void
possible_polymorphic_call_targets_1 (vec <cgraph_node *> &nodes,
hash_set<tree> *inserted,
hash_set<tree> *matched_vtables,
tree otr_type,
odr_type type,
HOST_WIDE_INT otr_token,
tree outer_type,
HOST_WIDE_INT offset,
bool *completep,
vec <tree> &bases_to_consider,
bool consider_construction)
{
tree binfo = TYPE_BINFO (type->type);
unsigned int i;
auto_vec <tree, 8> type_binfos;
bool possibly_instantiated = type_possibly_instantiated_p (type->type);
/* We may need to consider types w/o instances because of possible derived
types using their methods either directly or via construction vtables.
We are safe to skip them when all derivations are known, since we will
handle them later.
This is done by recording them to BASES_TO_CONSIDER array. */
if (possibly_instantiated || consider_construction)
{
record_target_from_binfo (nodes,
(!possibly_instantiated
&& type_all_derivations_known_p (type->type))
? &bases_to_consider : NULL,
binfo, otr_type, type_binfos, otr_token,
outer_type, offset,
inserted, matched_vtables,
type->anonymous_namespace, completep);
}
for (i = 0; i < type->derived_types.length (); i++)
possible_polymorphic_call_targets_1 (nodes, inserted,
matched_vtables,
otr_type,
type->derived_types[i],
otr_token, outer_type, offset, completep,
bases_to_consider, consider_construction);
}
/* Cache of queries for polymorphic call targets.
Enumerating all call targets may get expensive when there are many
polymorphic calls in the program, so we memoize all the previous
queries and avoid duplicated work. */
struct polymorphic_call_target_d
{
HOST_WIDE_INT otr_token;
ipa_polymorphic_call_context context;
odr_type type;
vec <cgraph_node *> targets;
tree decl_warning;
int type_warning;
unsigned int n_odr_types;
bool complete;
bool speculative;
};
/* Polymorphic call target cache helpers. */
struct polymorphic_call_target_hasher
: pointer_hash <polymorphic_call_target_d>
{
static inline hashval_t hash (const polymorphic_call_target_d *);
static inline bool equal (const polymorphic_call_target_d *,
const polymorphic_call_target_d *);
static inline void remove (polymorphic_call_target_d *);
};
/* Return the computed hashcode for ODR_QUERY. */
inline hashval_t
polymorphic_call_target_hasher::hash (const polymorphic_call_target_d *odr_query)
{
inchash::hash hstate (odr_query->otr_token);
hstate.add_hwi (odr_query->type->id);
hstate.merge_hash (TYPE_UID (odr_query->context.outer_type));
hstate.add_hwi (odr_query->context.offset);
hstate.add_hwi (odr_query->n_odr_types);
if (odr_query->context.speculative_outer_type)
{
hstate.merge_hash (TYPE_UID (odr_query->context.speculative_outer_type));
hstate.add_hwi (odr_query->context.speculative_offset);
}
hstate.add_flag (odr_query->speculative);
hstate.add_flag (odr_query->context.maybe_in_construction);
hstate.add_flag (odr_query->context.maybe_derived_type);
hstate.add_flag (odr_query->context.speculative_maybe_derived_type);
hstate.commit_flag ();
return hstate.end ();
}
/* Compare cache entries T1 and T2. */
inline bool
polymorphic_call_target_hasher::equal (const polymorphic_call_target_d *t1,
const polymorphic_call_target_d *t2)
{
return (t1->type == t2->type && t1->otr_token == t2->otr_token
&& t1->speculative == t2->speculative
&& t1->context.offset == t2->context.offset
&& t1->context.speculative_offset == t2->context.speculative_offset
&& t1->context.outer_type == t2->context.outer_type
&& t1->context.speculative_outer_type == t2->context.speculative_outer_type
&& t1->context.maybe_in_construction
== t2->context.maybe_in_construction
&& t1->context.maybe_derived_type == t2->context.maybe_derived_type
&& (t1->context.speculative_maybe_derived_type
== t2->context.speculative_maybe_derived_type)
/* Adding new type may affect outcome of target search. */
&& t1->n_odr_types == t2->n_odr_types);
}
/* Remove entry in polymorphic call target cache hash. */
inline void
polymorphic_call_target_hasher::remove (polymorphic_call_target_d *v)
{
v->targets.release ();
free (v);
}
/* Polymorphic call target query cache. */
typedef hash_table<polymorphic_call_target_hasher>
polymorphic_call_target_hash_type;
static polymorphic_call_target_hash_type *polymorphic_call_target_hash;
/* Destroy polymorphic call target query cache. */
static void
free_polymorphic_call_targets_hash ()
{
if (cached_polymorphic_call_targets)
{
delete polymorphic_call_target_hash;
polymorphic_call_target_hash = NULL;
delete cached_polymorphic_call_targets;
cached_polymorphic_call_targets = NULL;
}
}
/* Force rebuilding type inheritance graph from scratch.
This is use to make sure that we do not keep references to types
which was not visible to free_lang_data. */
void
rebuild_type_inheritance_graph ()
{
if (!odr_hash)
return;
delete odr_hash;
if (in_lto_p)
delete odr_vtable_hash;
odr_hash = NULL;
odr_vtable_hash = NULL;
odr_types_ptr = NULL;
free_polymorphic_call_targets_hash ();
}
/* When virtual function is removed, we may need to flush the cache. */
static void
devirt_node_removal_hook (struct cgraph_node *n, void *d ATTRIBUTE_UNUSED)
{
if (cached_polymorphic_call_targets
&& cached_polymorphic_call_targets->contains (n))
free_polymorphic_call_targets_hash ();
}
/* Look up base of BINFO that has virtual table VTABLE with OFFSET. */
tree
subbinfo_with_vtable_at_offset (tree binfo, unsigned HOST_WIDE_INT offset,
tree vtable)
{
tree v = BINFO_VTABLE (binfo);
int i;
tree base_binfo;
unsigned HOST_WIDE_INT this_offset;
if (v)
{
if (!vtable_pointer_value_to_vtable (v, &v, &this_offset))
gcc_unreachable ();
if (offset == this_offset
&& DECL_ASSEMBLER_NAME (v) == DECL_ASSEMBLER_NAME (vtable))
return binfo;
}
for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
if (polymorphic_type_binfo_p (base_binfo))
{
base_binfo = subbinfo_with_vtable_at_offset (base_binfo, offset, vtable);
if (base_binfo)
return base_binfo;
}
return NULL;
}
/* T is known constant value of virtual table pointer.
Store virtual table to V and its offset to OFFSET.
Return false if T does not look like virtual table reference. */
bool
vtable_pointer_value_to_vtable (const_tree t, tree *v,
unsigned HOST_WIDE_INT *offset)
{
/* We expect &MEM[(void *)&virtual_table + 16B].
We obtain object's BINFO from the context of the virtual table.
This one contains pointer to virtual table represented via
POINTER_PLUS_EXPR. Verify that this pointer matches what
we propagated through.
In the case of virtual inheritance, the virtual tables may
be nested, i.e. the offset may be different from 16 and we may
need to dive into the type representation. */
if (TREE_CODE (t) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (t, 0)) == MEM_REF
&& TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 1)) == INTEGER_CST
&& (TREE_CODE (TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 0))
== VAR_DECL)
&& DECL_VIRTUAL_P (TREE_OPERAND (TREE_OPERAND
(TREE_OPERAND (t, 0), 0), 0)))
{
*v = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 0);
*offset = tree_to_uhwi (TREE_OPERAND (TREE_OPERAND (t, 0), 1));
return true;
}
/* Alternative representation, used by C++ frontend is POINTER_PLUS_EXPR.
We need to handle it when T comes from static variable initializer or
BINFO. */
if (TREE_CODE (t) == POINTER_PLUS_EXPR)
{
*offset = tree_to_uhwi (TREE_OPERAND (t, 1));
t = TREE_OPERAND (t, 0);
}
else
*offset = 0;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
*v = TREE_OPERAND (t, 0);
return true;
}
/* T is known constant value of virtual table pointer. Return BINFO of the
instance type. */
tree
vtable_pointer_value_to_binfo (const_tree t)
{
tree vtable;
unsigned HOST_WIDE_INT offset;
if (!vtable_pointer_value_to_vtable (t, &vtable, &offset))
return NULL_TREE;
/* FIXME: for stores of construction vtables we return NULL,
because we do not have BINFO for those. Eventually we should fix
our representation to allow this case to be handled, too.
In the case we see store of BINFO we however may assume
that standard folding will be able to cope with it. */
return subbinfo_with_vtable_at_offset (TYPE_BINFO (DECL_CONTEXT (vtable)),
offset, vtable);
}
/* Walk bases of OUTER_TYPE that contain OTR_TYPE at OFFSET.
Look up their respective virtual methods for OTR_TOKEN and OTR_TYPE
and insert them in NODES.
MATCHED_VTABLES and INSERTED is used to avoid duplicated work. */
static void
record_targets_from_bases (tree otr_type,
HOST_WIDE_INT otr_token,
tree outer_type,
HOST_WIDE_INT offset,
vec <cgraph_node *> &nodes,
hash_set<tree> *inserted,
hash_set<tree> *matched_vtables,
bool *completep)
{
while (true)
{
HOST_WIDE_INT pos, size;
tree base_binfo;
tree fld;
if (types_same_for_odr (outer_type, otr_type))
return;
for (fld = TYPE_FIELDS (outer_type); fld; fld = DECL_CHAIN (fld))
{
if (TREE_CODE (fld) != FIELD_DECL)
continue;
pos = int_bit_position (fld);
size = tree_to_shwi (DECL_SIZE (fld));
if (pos <= offset && (pos + size) > offset
/* Do not get confused by zero sized bases. */
&& polymorphic_type_binfo_p (TYPE_BINFO (TREE_TYPE (fld))))
break;
}
/* Within a class type we should always find corresponding fields. */
gcc_assert (fld && TREE_CODE (TREE_TYPE (fld)) == RECORD_TYPE);
/* Nonbase types should have been stripped by outer_class_type. */
gcc_assert (DECL_ARTIFICIAL (fld));
outer_type = TREE_TYPE (fld);
offset -= pos;
base_binfo = get_binfo_at_offset (TYPE_BINFO (outer_type),
offset, otr_type);
if (!base_binfo)
{
gcc_assert (odr_violation_reported);
return;
}
gcc_assert (base_binfo);
if (!matched_vtables->add (BINFO_VTABLE (base_binfo)))
{
bool can_refer;
tree target = gimple_get_virt_method_for_binfo (otr_token,
base_binfo,
&can_refer);
if (!target || ! DECL_CXX_DESTRUCTOR_P (target))
maybe_record_node (nodes, target, inserted, can_refer, completep);
matched_vtables->add (BINFO_VTABLE (base_binfo));
}
}
}
/* When virtual table is removed, we may need to flush the cache. */
static void
devirt_variable_node_removal_hook (varpool_node *n,
void *d ATTRIBUTE_UNUSED)
{
if (cached_polymorphic_call_targets
&& DECL_VIRTUAL_P (n->decl)
&& type_in_anonymous_namespace_p (DECL_CONTEXT (n->decl)))
free_polymorphic_call_targets_hash ();
}
/* Record about how many calls would benefit from given type to be final. */
struct odr_type_warn_count
{
tree type;
int count;
profile_count dyn_count;
};
/* Record about how many calls would benefit from given method to be final. */
struct decl_warn_count
{
tree decl;
int count;
profile_count dyn_count;
};
/* Information about type and decl warnings. */
struct final_warning_record
{
/* If needed grow type_warnings vector and initialize new decl_warn_count
to have dyn_count set to profile_count::zero (). */
void grow_type_warnings (unsigned newlen);
profile_count dyn_count;
auto_vec<odr_type_warn_count> type_warnings;
hash_map<tree, decl_warn_count> decl_warnings;
};
void
final_warning_record::grow_type_warnings (unsigned newlen)
{
unsigned len = type_warnings.length ();
if (newlen > len)
{
type_warnings.safe_grow_cleared (newlen);
for (unsigned i = len; i < newlen; i++)
type_warnings[i].dyn_count = profile_count::zero ();
}
}
struct final_warning_record *final_warning_records;
/* Return vector containing possible targets of polymorphic call of type
OTR_TYPE calling method OTR_TOKEN within type of OTR_OUTER_TYPE and OFFSET.
If INCLUDE_BASES is true, walk also base types of OUTER_TYPES containing
OTR_TYPE and include their virtual method. This is useful for types
possibly in construction or destruction where the virtual table may
temporarily change to one of base types. INCLUDE_DERIVER_TYPES make
us to walk the inheritance graph for all derivations.
If COMPLETEP is non-NULL, store true if the list is complete.
CACHE_TOKEN (if non-NULL) will get stored to an unique ID of entry
in the target cache. If user needs to visit every target list
just once, it can memoize them.
If SPECULATIVE is set, the list will not contain targets that
are not speculatively taken.
Returned vector is placed into cache. It is NOT caller's responsibility
to free it. The vector can be freed on cgraph_remove_node call if
the particular node is a virtual function present in the cache. */
vec <cgraph_node *>
possible_polymorphic_call_targets (tree otr_type,
HOST_WIDE_INT otr_token,
ipa_polymorphic_call_context context,
bool *completep,
void **cache_token,
bool speculative)
{
static struct cgraph_node_hook_list *node_removal_hook_holder;
vec <cgraph_node *> nodes = vNULL;
auto_vec <tree, 8> bases_to_consider;
odr_type type, outer_type;
polymorphic_call_target_d key;
polymorphic_call_target_d **slot;
unsigned int i;
tree binfo, target;
bool complete;
bool can_refer = false;
bool skipped = false;
otr_type = TYPE_MAIN_VARIANT (otr_type);
/* If ODR is not initialized or the context is invalid, return empty
incomplete list. */
if (!odr_hash || context.invalid || !TYPE_BINFO (otr_type))
{
if (completep)
*completep = context.invalid;
if (cache_token)
*cache_token = NULL;
return nodes;
}
/* Do not bother to compute speculative info when user do not asks for it. */
if (!speculative || !context.speculative_outer_type)
context.clear_speculation ();
type = get_odr_type (otr_type, true);
/* Recording type variants would waste results cache. */
gcc_assert (!context.outer_type
|| TYPE_MAIN_VARIANT (context.outer_type) == context.outer_type);
/* Look up the outer class type we want to walk.
If we fail to do so, the context is invalid. */
if ((context.outer_type || context.speculative_outer_type)
&& !context.restrict_to_inner_class (otr_type))
{
if (completep)
*completep = true;
if (cache_token)
*cache_token = NULL;
return nodes;
}
gcc_assert (!context.invalid);
/* Check that restrict_to_inner_class kept the main variant. */
gcc_assert (!context.outer_type
|| TYPE_MAIN_VARIANT (context.outer_type) == context.outer_type);
/* We canonicalize our query, so we do not need extra hashtable entries. */
/* Without outer type, we have no use for offset. Just do the
basic search from inner type. */
if (!context.outer_type)
context.clear_outer_type (otr_type);
/* We need to update our hierarchy if the type does not exist. */
outer_type = get_odr_type (context.outer_type, true);
/* If the type is complete, there are no derivations. */
if (TYPE_FINAL_P (outer_type->type))
context.maybe_derived_type = false;
/* Initialize query cache. */
if (!cached_polymorphic_call_targets)
{
cached_polymorphic_call_targets = new hash_set<cgraph_node *>;
polymorphic_call_target_hash
= new polymorphic_call_target_hash_type (23);
if (!node_removal_hook_holder)
{
node_removal_hook_holder =
symtab->add_cgraph_removal_hook (&devirt_node_removal_hook, NULL);
symtab->add_varpool_removal_hook (&devirt_variable_node_removal_hook,
NULL);
}
}
if (in_lto_p)
{
if (context.outer_type != otr_type)
context.outer_type
= get_odr_type (context.outer_type, true)->type;
if (context.speculative_outer_type)
context.speculative_outer_type
= get_odr_type (context.speculative_outer_type, true)->type;
}
/* Look up cached answer. */
key.type = type;
key.otr_token = otr_token;
key.speculative = speculative;
key.context = context;
key.n_odr_types = odr_types.length ();
slot = polymorphic_call_target_hash->find_slot (&key, INSERT);
if (cache_token)
*cache_token = (void *)*slot;
if (*slot)
{
if (completep)
*completep = (*slot)->complete;
if ((*slot)->type_warning && final_warning_records)
{
final_warning_records->type_warnings[(*slot)->type_warning - 1].count++;
if (!final_warning_records->type_warnings
[(*slot)->type_warning - 1].dyn_count.initialized_p ())
final_warning_records->type_warnings
[(*slot)->type_warning - 1].dyn_count = profile_count::zero ();
if (final_warning_records->dyn_count > 0)
final_warning_records->type_warnings[(*slot)->type_warning - 1].dyn_count
= final_warning_records->type_warnings[(*slot)->type_warning - 1].dyn_count
+ final_warning_records->dyn_count;
}
if (!speculative && (*slot)->decl_warning && final_warning_records)
{
struct decl_warn_count *c =
final_warning_records->decl_warnings.get ((*slot)->decl_warning);
c->count++;
if (final_warning_records->dyn_count > 0)
c->dyn_count += final_warning_records->dyn_count;
}
return (*slot)->targets;
}
complete = true;
/* Do actual search. */
timevar_push (TV_IPA_VIRTUAL_CALL);
*slot = XCNEW (polymorphic_call_target_d);
if (cache_token)
*cache_token = (void *)*slot;
(*slot)->type = type;
(*slot)->otr_token = otr_token;
(*slot)->context = context;
(*slot)->speculative = speculative;
hash_set<tree> inserted;
hash_set<tree> matched_vtables;
/* First insert targets we speculatively identified as likely. */
if (context.speculative_outer_type)
{
odr_type speculative_outer_type;
bool speculation_complete = true;
/* First insert target from type itself and check if it may have
derived types. */
speculative_outer_type = get_odr_type (context.speculative_outer_type, true);
if (TYPE_FINAL_P (speculative_outer_type->type))
context.speculative_maybe_derived_type = false;
binfo = get_binfo_at_offset (TYPE_BINFO (speculative_outer_type->type),
context.speculative_offset, otr_type);
if (binfo)
target = gimple_get_virt_method_for_binfo (otr_token, binfo,
&can_refer);
else
target = NULL;
/* In the case we get complete method, we don't need
to walk derivations. */
if (target && DECL_FINAL_P (target))
context.speculative_maybe_derived_type = false;
if (type_possibly_instantiated_p (speculative_outer_type->type))
maybe_record_node (nodes, target, &inserted, can_refer, &speculation_complete);
if (binfo)
matched_vtables.add (BINFO_VTABLE (binfo));
/* Next walk recursively all derived types. */
if (context.speculative_maybe_derived_type)
for (i = 0; i < speculative_outer_type->derived_types.length(); i++)
possible_polymorphic_call_targets_1 (nodes, &inserted,
&matched_vtables,
otr_type,
speculative_outer_type->derived_types[i],
otr_token, speculative_outer_type->type,
context.speculative_offset,
&speculation_complete,
bases_to_consider,
false);
}
if (!speculative || !nodes.length ())
{
/* First see virtual method of type itself. */
binfo = get_binfo_at_offset (TYPE_BINFO (outer_type->type),
context.offset, otr_type);
if (binfo)
target = gimple_get_virt_method_for_binfo (otr_token, binfo,
&can_refer);
else
{
gcc_assert (odr_violation_reported);
target = NULL;
}
/* Destructors are never called through construction virtual tables,
because the type is always known. */
if (target && DECL_CXX_DESTRUCTOR_P (target))
context.maybe_in_construction = false;
if (target)
{
/* In the case we get complete method, we don't need
to walk derivations. */
if (DECL_FINAL_P (target))
context.maybe_derived_type = false;
}
/* If OUTER_TYPE is abstract, we know we are not seeing its instance. */
if (type_possibly_instantiated_p (outer_type->type))
maybe_record_node (nodes, target, &inserted, can_refer, &complete);
else
skipped = true;
if (binfo)
matched_vtables.add (BINFO_VTABLE (binfo));
/* Next walk recursively all derived types. */
if (context.maybe_derived_type)
{
for (i = 0; i < outer_type->derived_types.length(); i++)
possible_polymorphic_call_targets_1 (nodes, &inserted,
&matched_vtables,
otr_type,
outer_type->derived_types[i],
otr_token, outer_type->type,
context.offset, &complete,
bases_to_consider,
context.maybe_in_construction);
if (!outer_type->all_derivations_known)
{
if (!speculative && final_warning_records
&& nodes.length () == 1
&& TREE_CODE (TREE_TYPE (nodes[0]->decl)) == METHOD_TYPE)
{
if (complete
&& warn_suggest_final_types
&& !outer_type->derived_types.length ())
{
final_warning_records->grow_type_warnings
(outer_type->id);
final_warning_records->type_warnings[outer_type->id].count++;
if (!final_warning_records->type_warnings
[outer_type->id].dyn_count.initialized_p ())
final_warning_records->type_warnings
[outer_type->id].dyn_count = profile_count::zero ();
final_warning_records->type_warnings[outer_type->id].dyn_count
+= final_warning_records->dyn_count;
final_warning_records->type_warnings[outer_type->id].type
= outer_type->type;
(*slot)->type_warning = outer_type->id + 1;
}
if (complete
&& warn_suggest_final_methods
&& types_same_for_odr (DECL_CONTEXT (nodes[0]->decl),
outer_type->type))
{
bool existed;
struct decl_warn_count &c =
final_warning_records->decl_warnings.get_or_insert
(nodes[0]->decl, &existed);
if (existed)
{
c.count++;
c.dyn_count += final_warning_records->dyn_count;
}
else
{
c.count = 1;
c.dyn_count = final_warning_records->dyn_count;
c.decl = nodes[0]->decl;
}
(*slot)->decl_warning = nodes[0]->decl;
}
}
complete = false;
}
}
if (!speculative)
{
/* Destructors are never called through construction virtual tables,
because the type is always known. One of entries may be
cxa_pure_virtual so look to at least two of them. */
if (context.maybe_in_construction)
for (i =0 ; i < MIN (nodes.length (), 2); i++)
if (DECL_CXX_DESTRUCTOR_P (nodes[i]->decl))
context.maybe_in_construction = false;
if (context.maybe_in_construction)
{
if (type != outer_type
&& (!skipped
|| (context.maybe_derived_type
&& !type_all_derivations_known_p (outer_type->type))))
record_targets_from_bases (otr_type, otr_token, outer_type->type,
context.offset, nodes, &inserted,
&matched_vtables, &complete);
if (skipped)
maybe_record_node (nodes, target, &inserted, can_refer, &complete);
for (i = 0; i < bases_to_consider.length(); i++)
maybe_record_node (nodes, bases_to_consider[i], &inserted, can_refer, &complete);
}
}
}
(*slot)->targets = nodes;
(*slot)->complete = complete;
(*slot)->n_odr_types = odr_types.length ();
if (completep)
*completep = complete;
timevar_pop (TV_IPA_VIRTUAL_CALL);
return nodes;
}
bool
add_decl_warning (const tree &key ATTRIBUTE_UNUSED, const decl_warn_count &value,
vec<const decl_warn_count*> *vec)
{
vec->safe_push (&value);
return true;
}
/* Dump target list TARGETS into FILE. */
static void
dump_targets (FILE *f, vec <cgraph_node *> targets, bool verbose)
{
unsigned int i;
for (i = 0; i < targets.length (); i++)
{
char *name = NULL;
if (in_lto_p)
name = cplus_demangle_v3 (targets[i]->asm_name (), 0);
fprintf (f, " %s/%i", name ? name : targets[i]->name (),
targets[i]->order);
if (in_lto_p)
free (name);
if (!targets[i]->definition)
fprintf (f, " (no definition%s)",
DECL_DECLARED_INLINE_P (targets[i]->decl)
? " inline" : "");
/* With many targets for every call polymorphic dumps are going to
be quadratic in size. */
if (i > 10 && !verbose)
{
fprintf (f, " ... and %i more targets\n", targets.length () - i);
return;
}
}
fprintf (f, "\n");
}
/* Dump all possible targets of a polymorphic call. */
void
dump_possible_polymorphic_call_targets (FILE *f,
tree otr_type,
HOST_WIDE_INT otr_token,
const ipa_polymorphic_call_context &ctx,
bool verbose)
{
vec <cgraph_node *> targets;
bool final;
odr_type type = get_odr_type (TYPE_MAIN_VARIANT (otr_type), false);
unsigned int len;
if (!type)
return;
targets = possible_polymorphic_call_targets (otr_type, otr_token,
ctx,
&final, NULL, false);
fprintf (f, " Targets of polymorphic call of type %i:", type->id);
print_generic_expr (f, type->type, TDF_SLIM);
fprintf (f, " token %i\n", (int)otr_token);
ctx.dump (f);
fprintf (f, " %s%s%s%s\n ",
final ? "This is a complete list." :
"This is partial list; extra targets may be defined in other units.",
ctx.maybe_in_construction ? " (base types included)" : "",
ctx.maybe_derived_type ? " (derived types included)" : "",
ctx.speculative_maybe_derived_type ? " (speculative derived types included)" : "");
len = targets.length ();
dump_targets (f, targets, verbose);
targets = possible_polymorphic_call_targets (otr_type, otr_token,
ctx,
&final, NULL, true);
if (targets.length () != len)
{
fprintf (f, " Speculative targets:");
dump_targets (f, targets, verbose);
}
/* Ugly: during callgraph construction the target cache may get populated
before all targets are found. While this is harmless (because all local
types are discovered and only in those case we devirtualize fully and we
don't do speculative devirtualization before IPA stage) it triggers
assert here when dumping at that stage also populates the case with
speculative targets. Quietly ignore this. */
gcc_assert (symtab->state < IPA_SSA || targets.length () <= len);
fprintf (f, "\n");
}
/* Return true if N can be possibly target of a polymorphic call of
OTR_TYPE/OTR_TOKEN. */
bool
possible_polymorphic_call_target_p (tree otr_type,
HOST_WIDE_INT otr_token,
const ipa_polymorphic_call_context &ctx,
struct cgraph_node *n)
{
vec <cgraph_node *> targets;
unsigned int i;
enum built_in_function fcode;
bool final;
if (TREE_CODE (TREE_TYPE (n->decl)) == FUNCTION_TYPE
&& ((fcode = DECL_FUNCTION_CODE (n->decl)) == BUILT_IN_UNREACHABLE
|| fcode == BUILT_IN_TRAP))
return true;
if (is_cxa_pure_virtual_p (n->decl))
return true;
if (!odr_hash)
return true;
targets = possible_polymorphic_call_targets (otr_type, otr_token, ctx, &final);
for (i = 0; i < targets.length (); i++)
if (n->semantically_equivalent_p (targets[i]))
return true;
/* At a moment we allow middle end to dig out new external declarations
as a targets of polymorphic calls. */
if (!final && !n->definition)
return true;
return false;
}
/* Return true if N can be possibly target of a polymorphic call of
OBJ_TYPE_REF expression REF in STMT. */
bool
possible_polymorphic_call_target_p (tree ref,
gimple *stmt,
struct cgraph_node *n)
{
ipa_polymorphic_call_context context (current_function_decl, ref, stmt);
tree call_fn = gimple_call_fn (stmt);
return possible_polymorphic_call_target_p (obj_type_ref_class (call_fn),
tree_to_uhwi
(OBJ_TYPE_REF_TOKEN (call_fn)),
context,
n);
}
/* After callgraph construction new external nodes may appear.
Add them into the graph. */
void
update_type_inheritance_graph (void)
{
struct cgraph_node *n;
if (!odr_hash)
return;
free_polymorphic_call_targets_hash ();
timevar_push (TV_IPA_INHERITANCE);
/* We reconstruct the graph starting from types of all methods seen in the
unit. */
FOR_EACH_FUNCTION (n)
if (DECL_VIRTUAL_P (n->decl)
&& !n->definition
&& n->real_symbol_p ())
get_odr_type (TYPE_METHOD_BASETYPE (TREE_TYPE (n->decl)), true);
timevar_pop (TV_IPA_INHERITANCE);
}
/* Return true if N looks like likely target of a polymorphic call.
Rule out cxa_pure_virtual, noreturns, function declared cold and
other obvious cases. */
bool
likely_target_p (struct cgraph_node *n)
{
int flags;
/* cxa_pure_virtual and similar things are not likely. */
if (TREE_CODE (TREE_TYPE (n->decl)) != METHOD_TYPE)
return false;
flags = flags_from_decl_or_type (n->decl);
if (flags & ECF_NORETURN)
return false;
if (lookup_attribute ("cold",
DECL_ATTRIBUTES (n->decl)))
return false;
if (n->frequency < NODE_FREQUENCY_NORMAL)
return false;
/* If there are no live virtual tables referring the target,
the only way the target can be called is an instance coming from other
compilation unit; speculative devirtualization is built around an
assumption that won't happen. */
if (!referenced_from_vtable_p (n))
return false;
return true;
}
/* Compare type warning records P1 and P2 and choose one with larger count;
helper for qsort. */
int
type_warning_cmp (const void *p1, const void *p2)
{
const odr_type_warn_count *t1 = (const odr_type_warn_count *)p1;
const odr_type_warn_count *t2 = (const odr_type_warn_count *)p2;
if (t1->dyn_count < t2->dyn_count)
return 1;
if (t1->dyn_count > t2->dyn_count)
return -1;
return t2->count - t1->count;
}
/* Compare decl warning records P1 and P2 and choose one with larger count;
helper for qsort. */
int
decl_warning_cmp (const void *p1, const void *p2)
{
const decl_warn_count *t1 = *(const decl_warn_count * const *)p1;
const decl_warn_count *t2 = *(const decl_warn_count * const *)p2;
if (t1->dyn_count < t2->dyn_count)
return 1;
if (t1->dyn_count > t2->dyn_count)
return -1;
return t2->count - t1->count;
}
/* Try to speculatively devirtualize call to OTR_TYPE with OTR_TOKEN with
context CTX. */
struct cgraph_node *
try_speculative_devirtualization (tree otr_type, HOST_WIDE_INT otr_token,
ipa_polymorphic_call_context ctx)
{
vec <cgraph_node *>targets
= possible_polymorphic_call_targets
(otr_type, otr_token, ctx, NULL, NULL, true);
unsigned int i;
struct cgraph_node *likely_target = NULL;
for (i = 0; i < targets.length (); i++)
if (likely_target_p (targets[i]))
{
if (likely_target)
return NULL;
likely_target = targets[i];
}
if (!likely_target
||!likely_target->definition
|| DECL_EXTERNAL (likely_target->decl))
return NULL;
/* Don't use an implicitly-declared destructor (c++/58678). */
struct cgraph_node *non_thunk_target
= likely_target->function_symbol ();
if (DECL_ARTIFICIAL (non_thunk_target->decl))
return NULL;
if (likely_target->get_availability () <= AVAIL_INTERPOSABLE
&& likely_target->can_be_discarded_p ())
return NULL;
return likely_target;
}
/* The ipa-devirt pass.
When polymorphic call has only one likely target in the unit,
turn it into a speculative call. */
static unsigned int
ipa_devirt (void)
{
struct cgraph_node *n;
hash_set<void *> bad_call_targets;
struct cgraph_edge *e;
int npolymorphic = 0, nspeculated = 0, nconverted = 0, ncold = 0;
int nmultiple = 0, noverwritable = 0, ndevirtualized = 0, nnotdefined = 0;
int nwrong = 0, nok = 0, nexternal = 0, nartificial = 0;
int ndropped = 0;
if (!odr_types_ptr)
return 0;
if (dump_file)
dump_type_inheritance_graph (dump_file);
/* We can output -Wsuggest-final-methods and -Wsuggest-final-types warnings.
This is implemented by setting up final_warning_records that are updated
by get_polymorphic_call_targets.
We need to clear cache in this case to trigger recomputation of all
entries. */
if (warn_suggest_final_methods || warn_suggest_final_types)
{
final_warning_records = new (final_warning_record);
final_warning_records->dyn_count = profile_count::zero ();
final_warning_records->grow_type_warnings (odr_types.length ());
free_polymorphic_call_targets_hash ();
}
FOR_EACH_DEFINED_FUNCTION (n)
{
bool update = false;
if (!opt_for_fn (n->decl, flag_devirtualize))
continue;
if (dump_file && n->indirect_calls)
fprintf (dump_file, "\n\nProcesing function %s\n",
n->dump_name ());
for (e = n->indirect_calls; e; e = e->next_callee)
if (e->indirect_info->polymorphic)
{
struct cgraph_node *likely_target = NULL;
void *cache_token;
bool final;
if (final_warning_records)
final_warning_records->dyn_count = e->count.ipa ();
vec <cgraph_node *>targets
= possible_polymorphic_call_targets
(e, &final, &cache_token, true);
unsigned int i;
/* Trigger warnings by calculating non-speculative targets. */
if (warn_suggest_final_methods || warn_suggest_final_types)
possible_polymorphic_call_targets (e);
if (dump_file)
dump_possible_polymorphic_call_targets
(dump_file, e, (dump_flags & TDF_DETAILS));
npolymorphic++;
/* See if the call can be devirtualized by means of ipa-prop's
polymorphic call context propagation. If not, we can just
forget about this call being polymorphic and avoid some heavy
lifting in remove_unreachable_nodes that will otherwise try to
keep all possible targets alive until inlining and in the inliner
itself.
This may need to be revisited once we add further ways to use
the may edges, but it is a resonable thing to do right now. */
if ((e->indirect_info->param_index == -1
|| (!opt_for_fn (n->decl, flag_devirtualize_speculatively)
&& e->indirect_info->vptr_changed))
&& !flag_ltrans_devirtualize)
{
e->indirect_info->polymorphic = false;
ndropped++;
if (dump_file)
fprintf (dump_file, "Dropping polymorphic call info;"
" it cannot be used by ipa-prop\n");
}
if (!opt_for_fn (n->decl, flag_devirtualize_speculatively))
continue;
if (!e->maybe_hot_p ())
{
if (dump_file)
fprintf (dump_file, "Call is cold\n\n");
ncold++;
continue;
}
if (e->speculative)
{
if (dump_file)
fprintf (dump_file, "Call is already speculated\n\n");
nspeculated++;
/* When dumping see if we agree with speculation. */
if (!dump_file)
continue;
}
if (bad_call_targets.contains (cache_token))
{
if (dump_file)
fprintf (dump_file, "Target list is known to be useless\n\n");
nmultiple++;
continue;
}
for (i = 0; i < targets.length (); i++)
if (likely_target_p (targets[i]))
{
if (likely_target)
{
likely_target = NULL;
if (dump_file)
fprintf (dump_file, "More than one likely target\n\n");
nmultiple++;
break;
}
likely_target = targets[i];
}
if (!likely_target)
{
bad_call_targets.add (cache_token);
continue;
}
/* This is reached only when dumping; check if we agree or disagree
with the speculation. */
if (e->speculative)
{
struct cgraph_edge *e2;
struct ipa_ref *ref;
e->speculative_call_info (e2, e, ref);
if (e2->callee->ultimate_alias_target ()
== likely_target->ultimate_alias_target ())
{
fprintf (dump_file, "We agree with speculation\n\n");
nok++;
}
else
{
fprintf (dump_file, "We disagree with speculation\n\n");
nwrong++;
}
continue;
}
if (!likely_target->definition)
{
if (dump_file)
fprintf (dump_file, "Target is not a definition\n\n");
nnotdefined++;
continue;
}
/* Do not introduce new references to external symbols. While we
can handle these just well, it is common for programs to
incorrectly with headers defining methods they are linked
with. */
if (DECL_EXTERNAL (likely_target->decl))
{
if (dump_file)
fprintf (dump_file, "Target is external\n\n");
nexternal++;
continue;
}
/* Don't use an implicitly-declared destructor (c++/58678). */
struct cgraph_node *non_thunk_target
= likely_target->function_symbol ();
if (DECL_ARTIFICIAL (non_thunk_target->decl))
{
if (dump_file)
fprintf (dump_file, "Target is artificial\n\n");
nartificial++;
continue;
}
if (likely_target->get_availability () <= AVAIL_INTERPOSABLE
&& likely_target->can_be_discarded_p ())
{
if (dump_file)
fprintf (dump_file, "Target is overwritable\n\n");
noverwritable++;
continue;
}
else if (dbg_cnt (devirt))
{
if (dump_enabled_p ())
{
dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, e->call_stmt,
"speculatively devirtualizing call "
"in %s to %s\n",
n->dump_name (),
likely_target->dump_name ());
}
if (!likely_target->can_be_discarded_p ())
{
cgraph_node *alias;
alias = dyn_cast<cgraph_node *> (likely_target->noninterposable_alias ());
if (alias)
likely_target = alias;
}
nconverted++;
update = true;
e->make_speculative
(likely_target, e->count.apply_scale (8, 10));
}
}
if (update)
ipa_update_overall_fn_summary (n);
}
if (warn_suggest_final_methods || warn_suggest_final_types)
{
if (warn_suggest_final_types)
{
final_warning_records->type_warnings.qsort (type_warning_cmp);
for (unsigned int i = 0;
i < final_warning_records->type_warnings.length (); i++)
if (final_warning_records->type_warnings[i].count)
{
tree type = final_warning_records->type_warnings[i].type;
int count = final_warning_records->type_warnings[i].count;
profile_count dyn_count
= final_warning_records->type_warnings[i].dyn_count;
if (!(dyn_count > 0))
warning_n (DECL_SOURCE_LOCATION (TYPE_NAME (type)),
OPT_Wsuggest_final_types, count,
"Declaring type %qD final "
"would enable devirtualization of %i call",
"Declaring type %qD final "
"would enable devirtualization of %i calls",
type,
count);
else
warning_n (DECL_SOURCE_LOCATION (TYPE_NAME (type)),
OPT_Wsuggest_final_types, count,
"Declaring type %qD final "
"would enable devirtualization of %i call "
"executed %lli times",
"Declaring type %qD final "
"would enable devirtualization of %i calls "
"executed %lli times",
type,
count,
(long long) dyn_count.to_gcov_type ());
}
}
if (warn_suggest_final_methods)
{
auto_vec<const decl_warn_count*> decl_warnings_vec;
final_warning_records->decl_warnings.traverse
<vec<const decl_warn_count *> *, add_decl_warning> (&decl_warnings_vec);
decl_warnings_vec.qsort (decl_warning_cmp);
for (unsigned int i = 0; i < decl_warnings_vec.length (); i++)
{
tree decl = decl_warnings_vec[i]->decl;
int count = decl_warnings_vec[i]->count;
profile_count dyn_count
= decl_warnings_vec[i]->dyn_count;
if (!(dyn_count > 0))
if (DECL_CXX_DESTRUCTOR_P (decl))
warning_n (DECL_SOURCE_LOCATION (decl),
OPT_Wsuggest_final_methods, count,
"Declaring virtual destructor of %qD final "
"would enable devirtualization of %i call",
"Declaring virtual destructor of %qD final "
"would enable devirtualization of %i calls",
DECL_CONTEXT (decl), count);
else
warning_n (DECL_SOURCE_LOCATION (decl),
OPT_Wsuggest_final_methods, count,
"Declaring method %qD final "
"would enable devirtualization of %i call",
"Declaring method %qD final "
"would enable devirtualization of %i calls",
decl, count);
else if (DECL_CXX_DESTRUCTOR_P (decl))
warning_n (DECL_SOURCE_LOCATION (decl),
OPT_Wsuggest_final_methods, count,
"Declaring virtual destructor of %qD final "
"would enable devirtualization of %i call "
"executed %lli times",
"Declaring virtual destructor of %qD final "
"would enable devirtualization of %i calls "
"executed %lli times",
DECL_CONTEXT (decl), count,
(long long)dyn_count.to_gcov_type ());
else
warning_n (DECL_SOURCE_LOCATION (decl),
OPT_Wsuggest_final_methods, count,
"Declaring method %qD final "
"would enable devirtualization of %i call "
"executed %lli times",
"Declaring method %qD final "
"would enable devirtualization of %i calls "
"executed %lli times",
decl, count,
(long long)dyn_count.to_gcov_type ());
}
}
delete (final_warning_records);
final_warning_records = 0;
}
if (dump_file)
fprintf (dump_file,
"%i polymorphic calls, %i devirtualized,"
" %i speculatively devirtualized, %i cold\n"
"%i have multiple targets, %i overwritable,"
" %i already speculated (%i agree, %i disagree),"
" %i external, %i not defined, %i artificial, %i infos dropped\n",
npolymorphic, ndevirtualized, nconverted, ncold,
nmultiple, noverwritable, nspeculated, nok, nwrong,
nexternal, nnotdefined, nartificial, ndropped);
return ndevirtualized || ndropped ? TODO_remove_functions : 0;
}
namespace {
const pass_data pass_data_ipa_devirt =
{
IPA_PASS, /* type */
"devirt", /* name */
OPTGROUP_NONE, /* optinfo_flags */
TV_IPA_DEVIRT, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
( TODO_dump_symtab ), /* todo_flags_finish */
};
class pass_ipa_devirt : public ipa_opt_pass_d
{
public:
pass_ipa_devirt (gcc::context *ctxt)
: ipa_opt_pass_d (pass_data_ipa_devirt, ctxt,
NULL, /* generate_summary */
NULL, /* write_summary */
NULL, /* read_summary */
NULL, /* write_optimization_summary */
NULL, /* read_optimization_summary */
NULL, /* stmt_fixup */
0, /* function_transform_todo_flags_start */
NULL, /* function_transform */
NULL) /* variable_transform */
{}
/* opt_pass methods: */
virtual bool gate (function *)
{
/* In LTO, always run the IPA passes and decide on function basis if the
pass is enabled. */
if (in_lto_p)
return true;
return (flag_devirtualize
&& (flag_devirtualize_speculatively
|| (warn_suggest_final_methods
|| warn_suggest_final_types))
&& optimize);
}
virtual unsigned int execute (function *) { return ipa_devirt (); }
}; // class pass_ipa_devirt
} // anon namespace
ipa_opt_pass_d *
make_pass_ipa_devirt (gcc::context *ctxt)
{
return new pass_ipa_devirt (ctxt);
}
#include "gt-ipa-devirt.h"
|