summaryrefslogtreecommitdiff
path: root/gcc/cgraph.h
blob: 0d5806b458ebb7bcfad966e342d423053d38d519 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
/* Callgraph handling code.
   Copyright (C) 2003-2016 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/>.  */

#ifndef GCC_CGRAPH_H
#define GCC_CGRAPH_H

#include "ipa-ref.h"
#include "plugin-api.h"

class ipa_opt_pass_d;
typedef ipa_opt_pass_d *ipa_opt_pass;

/* Symbol table consists of functions and variables.
   TODO: add labels and CONST_DECLs.  */
enum symtab_type
{
  SYMTAB_SYMBOL,
  SYMTAB_FUNCTION,
  SYMTAB_VARIABLE
};

/* Section names are stored as reference counted strings in GGC safe hashtable
   (to make them survive through PCH).  */

struct GTY((for_user)) section_hash_entry
{
  int ref_count;
  char *name;  /* As long as this datastructure stays in GGC, we can not put
		  string at the tail of structure of GGC dies in horrible
		  way  */
};

struct section_name_hasher : ggc_ptr_hash<section_hash_entry>
{
  typedef const char *compare_type;

  static hashval_t hash (section_hash_entry *);
  static bool equal (section_hash_entry *, const char *);
};

enum availability
{
  /* Not yet set by cgraph_function_body_availability.  */
  AVAIL_UNSET,
  /* Function body/variable initializer is unknown.  */
  AVAIL_NOT_AVAILABLE,
  /* Function body/variable initializer is known but might be replaced
     by a different one from other compilation unit and thus needs to
     be dealt with a care.  Like AVAIL_NOT_AVAILABLE it can have
     arbitrary side effects on escaping variables and functions, while
     like AVAILABLE it might access static variables.  */
  AVAIL_INTERPOSABLE,
  /* Function body/variable initializer is known and will be used in final
     program.  */
  AVAIL_AVAILABLE,
  /* Function body/variable initializer is known and all it's uses are
     explicitly visible within current unit (ie it's address is never taken and
     it is not exported to other units). Currently used only for functions.  */
  AVAIL_LOCAL
};

/* Classification of symbols WRT partitioning.  */
enum symbol_partitioning_class
{
   /* External declarations are ignored by partitioning algorithms and they are
      added into the boundary later via compute_ltrans_boundary.  */
   SYMBOL_EXTERNAL,
   /* Partitioned symbols are pur into one of partitions.  */
   SYMBOL_PARTITION,
   /* Duplicated symbols (such as comdat or constant pool references) are
      copied into every node needing them via add_symbol_to_partition.  */
   SYMBOL_DUPLICATE
};

/* Base of all entries in the symbol table.
   The symtab_node is inherited by cgraph and varpol nodes.  */
class GTY((desc ("%h.type"), tag ("SYMTAB_SYMBOL"),
	   chain_next ("%h.next"), chain_prev ("%h.previous")))
  symtab_node
{
public:
  /* Return name.  */
  const char *name () const;

  /* Return asm name.  */
  const char * asm_name () const;

  /* Add node into symbol table.  This function is not used directly, but via
     cgraph/varpool node creation routines.  */
  void register_symbol (void);

  /* Remove symbol from symbol table.  */
  void remove (void);

  /* Dump symtab node to F.  */
  void dump (FILE *f);

  /* Dump symtab node to stderr.  */
  void DEBUG_FUNCTION debug (void);

  /* Verify consistency of node.  */
  void DEBUG_FUNCTION verify (void);

  /* Return ipa reference from this symtab_node to
     REFERED_NODE or REFERED_VARPOOL_NODE. USE_TYPE specify type
     of the use and STMT the statement (if it exists).  */
  ipa_ref *create_reference (symtab_node *referred_node,
			     enum ipa_ref_use use_type);

  /* Return ipa reference from this symtab_node to
     REFERED_NODE or REFERED_VARPOOL_NODE. USE_TYPE specify type
     of the use and STMT the statement (if it exists).  */
  ipa_ref *create_reference (symtab_node *referred_node,
			     enum ipa_ref_use use_type, gimple *stmt);

  /* If VAL is a reference to a function or a variable, add a reference from
     this symtab_node to the corresponding symbol table node.  USE_TYPE specify
     type of the use and STMT the statement (if it exists).  Return the new
     reference or NULL if none was created.  */
  ipa_ref *maybe_create_reference (tree val, enum ipa_ref_use use_type,
				   gimple *stmt);

  /* Clone all references from symtab NODE to this symtab_node.  */
  void clone_references (symtab_node *node);

  /* Remove all stmt references in non-speculative references.
     Those are not maintained during inlining & clonning.
     The exception are speculative references that are updated along
     with callgraph edges associated with them.  */
  void clone_referring (symtab_node *node);

  /* Clone reference REF to this symtab_node and set its stmt to STMT.  */
  ipa_ref *clone_reference (ipa_ref *ref, gimple *stmt);

  /* Find the structure describing a reference to REFERRED_NODE
     and associated with statement STMT.  */
  ipa_ref *find_reference (symtab_node *referred_node, gimple *stmt,
			   unsigned int lto_stmt_uid);

  /* Remove all references that are associated with statement STMT.  */
  void remove_stmt_references (gimple *stmt);

  /* Remove all stmt references in non-speculative references.
     Those are not maintained during inlining & clonning.
     The exception are speculative references that are updated along
     with callgraph edges associated with them.  */
  void clear_stmts_in_references (void);

  /* Remove all references in ref list.  */
  void remove_all_references (void);

  /* Remove all referring items in ref list.  */
  void remove_all_referring (void);

  /* Dump references in ref list to FILE.  */
  void dump_references (FILE *file);

  /* Dump referring in list to FILE.  */
  void dump_referring (FILE *);

  /* Get number of references for this node.  */
  inline unsigned num_references (void)
  {
    return ref_list.references ? ref_list.references->length () : 0;
  }

  /* Iterates I-th reference in the list, REF is also set.  */
  ipa_ref *iterate_reference (unsigned i, ipa_ref *&ref);

  /* Iterates I-th referring item in the list, REF is also set.  */
  ipa_ref *iterate_referring (unsigned i, ipa_ref *&ref);

  /* Iterates I-th referring alias item in the list, REF is also set.  */
  ipa_ref *iterate_direct_aliases (unsigned i, ipa_ref *&ref);

  /* Return true if symtab node and TARGET represents
     semantically equivalent symbols.  */
  bool semantically_equivalent_p (symtab_node *target);

  /* Classify symbol symtab node for partitioning.  */
  enum symbol_partitioning_class get_partitioning_class (void);

  /* Return comdat group.  */
  tree get_comdat_group ()
    {
      return x_comdat_group;
    }

  /* Return comdat group as identifier_node.  */
  tree get_comdat_group_id ()
    {
      if (x_comdat_group && TREE_CODE (x_comdat_group) != IDENTIFIER_NODE)
	x_comdat_group = DECL_ASSEMBLER_NAME (x_comdat_group);
      return x_comdat_group;
    }

  /* Set comdat group.  */
  void set_comdat_group (tree group)
    {
      gcc_checking_assert (!group || TREE_CODE (group) == IDENTIFIER_NODE
			   || DECL_P (group));
      x_comdat_group = group;
    }

  /* Return section as string.  */
  const char * get_section ()
    {
      if (!x_section)
	return NULL;
      return x_section->name;
    }

  /* Remove node from same comdat group.   */
  void remove_from_same_comdat_group (void);

  /* Add this symtab_node to the same comdat group that OLD is in.  */
  void add_to_same_comdat_group (symtab_node *old_node);

  /* Dissolve the same_comdat_group list in which NODE resides.  */
  void dissolve_same_comdat_group_list (void);

  /* Return true when symtab_node is known to be used from other (non-LTO)
     object file. Known only when doing LTO via linker plugin.  */
  bool used_from_object_file_p (void);

  /* Walk the alias chain to return the symbol NODE is alias of.
     If NODE is not an alias, return NODE.
     When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
  symtab_node *ultimate_alias_target (enum availability *avail = NULL);

  /* Return next reachable static symbol with initializer after NODE.  */
  inline symtab_node *next_defined_symbol (void);

  /* Add reference recording that symtab node is alias of TARGET.
     If TRANSPARENT is true make the alias to be transparent alias.
     The function can fail in the case of aliasing cycles; in this case
     it returns false.  */
  bool resolve_alias (symtab_node *target, bool transparent = false);

  /* C++ FE sometimes change linkage flags after producing same
     body aliases.  */
  void fixup_same_cpp_alias_visibility (symtab_node *target);

  /* Call callback on symtab node and aliases associated to this node.
     When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
     skipped.  */
  bool call_for_symbol_and_aliases (bool (*callback) (symtab_node *, void *),
				    void *data,
				    bool include_overwrite);

  /* If node can not be interposable by static or dynamic linker to point to
     different definition, return this symbol. Otherwise look for alias with
     such property and if none exists, introduce new one.  */
  symtab_node *noninterposable_alias (void);

  /* Return node that alias is aliasing.  */
  inline symtab_node *get_alias_target (void);

  /* Set section for symbol and its aliases.  */
  void set_section (const char *section);

  /* Set section, do not recurse into aliases.
     When one wants to change section of symbol and its aliases,
     use set_section.  */
  void set_section_for_node (const char *section);

  /* Set initialization priority to PRIORITY.  */
  void set_init_priority (priority_type priority);

  /* Return the initialization priority.  */
  priority_type get_init_priority ();

  /* Return availability of NODE.  */
  enum availability get_availability (void);

  /* Make DECL local.  */
  void make_decl_local (void);

  /* Copy visibility from N.  */
  void copy_visibility_from (symtab_node *n);

  /* Return desired alignment of the definition.  This is NOT alignment useful
     to access THIS, because THIS may be interposable and DECL_ALIGN should
     be used instead.  It however must be guaranteed when output definition
     of THIS.  */
  unsigned int definition_alignment ();

  /* Return true if alignment can be increased.  */
  bool can_increase_alignment_p ();

  /* Increase alignment of symbol to ALIGN.  */
  void increase_alignment (unsigned int align);

  /* Return true if list contains an alias.  */
  bool has_aliases_p (void);

  /* Return true when the symbol is real symbol, i.e. it is not inline clone
     or abstract function kept for debug info purposes only.  */
  bool real_symbol_p (void);

  /* Determine if symbol declaration is needed.  That is, visible to something
     either outside this translation unit, something magic in the system
     configury. This function is used just during symbol creation.  */
  bool needed_p (void);

  /* Return true when there are references to the node.  */
  bool referred_to_p (bool include_self = true);

  /* Return true if symbol can be discarded by linker from the binary.
     Assume that symbol is used (so there is no need to take into account
     garbage collecting linkers)

     This can happen for comdats, commons and weaks when they are previaled
     by other definition at static linking time.  */
  inline bool
  can_be_discarded_p (void)
  {
    return (DECL_EXTERNAL (decl)
	    || ((get_comdat_group ()
		 || DECL_COMMON (decl)
		 || (DECL_SECTION_NAME (decl) && DECL_WEAK (decl)))
		&& ((resolution != LDPR_PREVAILING_DEF
		     && resolution != LDPR_PREVAILING_DEF_IRONLY_EXP)
		    || flag_incremental_link)
		&& resolution != LDPR_PREVAILING_DEF_IRONLY));
  }

  /* Return true if NODE is local to a particular COMDAT group, and must not
     be named from outside the COMDAT.  This is used for C++ decloned
     constructors.  */
  inline bool comdat_local_p (void)
  {
    return (same_comdat_group && !TREE_PUBLIC (decl));
  }

  /* Return true if ONE and TWO are part of the same COMDAT group.  */
  inline bool in_same_comdat_group_p (symtab_node *target);

  /* Return true if symbol is known to be nonzero.  */
  bool nonzero_address ();

  /* Return 0 if symbol is known to have different address than S2,
     Return 1 if symbol is known to have same address as S2,
     return 2 otherwise. 

     If MEMORY_ACCESSED is true, assume that both memory pointer to THIS
     and S2 is going to be accessed.  This eliminates the situations when
     either THIS or S2 is NULL and is seful for comparing bases when deciding
     about memory aliasing.  */
  int equal_address_to (symtab_node *s2, bool memory_accessed = false);

  /* Return true if symbol's address may possibly be compared to other
     symbol's address.  */
  bool address_matters_p ();

  /* Return true if NODE's address can be compared.  This use properties
     of NODE only and does not look if the address is actually taken in
     interesting way.  For that use ADDRESS_MATTERS_P instead.  */
  bool address_can_be_compared_p (void);

  /* Return symbol table node associated with DECL, if any,
     and NULL otherwise.  */
  static inline symtab_node *get (const_tree decl)
  {
    /* Check that we are called for sane type of object - functions
       and static or external variables.  */
    gcc_checking_assert (TREE_CODE (decl) == FUNCTION_DECL
			 || (TREE_CODE (decl) == VAR_DECL
			     && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
				 || in_lto_p)));
    /* Check that the mapping is sane - perhaps this check can go away,
       but at the moment frontends tends to corrupt the mapping by calling
       memcpy/memset on the tree nodes.  */
    gcc_checking_assert (!decl->decl_with_vis.symtab_node
			 || decl->decl_with_vis.symtab_node->decl == decl);
    return decl->decl_with_vis.symtab_node;
  }

  /* Try to find a symtab node for declaration DECL and if it does not
     exist or if it corresponds to an inline clone, create a new one.  */
  static inline symtab_node * get_create (tree node);

  /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
     Return NULL if there's no such node.  */
  static symtab_node *get_for_asmname (const_tree asmname);

  /* Dump symbol table to F.  */
  static void dump_table (FILE *);

  /* Dump symbol table to stderr.  */
  static inline DEBUG_FUNCTION void debug_symtab (void)
  {
    dump_table (stderr);
  }

  /* Verify symbol table for internal consistency.  */
  static DEBUG_FUNCTION void verify_symtab_nodes (void);

  /* Perform internal consistency checks, if they are enabled.  */
  static inline void checking_verify_symtab_nodes (void);

  /* Type of the symbol.  */
  ENUM_BITFIELD (symtab_type) type : 8;

  /* The symbols resolution.  */
  ENUM_BITFIELD (ld_plugin_symbol_resolution) resolution : 8;

  /*** Flags representing the symbol type.  ***/

  /* True when symbol corresponds to a definition in current unit.
     set via finalize_function or finalize_decl  */
  unsigned definition : 1;
  /* True when symbol is an alias.
     Set by ssemble_alias.  */
  unsigned alias : 1;
  /* When true the alias is translated into its target symbol either by GCC
     or assembler (it also may just be a duplicate declaration of the same
     linker name).

     Currently transparent aliases come in three different flavors
       - aliases having the same assembler name as their target (aka duplicated
	 declarations). In this case the assembler names compare via
	 assembler_names_equal_p and weakref is false
       - aliases that are renamed at a time being output to final file
	 by varasm.c. For those DECL_ASSEMBLER_NAME have
	 IDENTIFIER_TRANSPARENT_ALIAS set and thus also their assembler
	 name must be unique.
	 Weakrefs belong to this cateogry when we target assembler without
	 .weakref directive.
       - weakrefs that are renamed by assembler via .weakref directive.
	 In this case the alias may or may not be definition (depending if
	 target declaration was seen by the compiler), weakref is set.
	 Unless we are before renaming statics, assembler names are different.

     Given that we now support duplicate declarations, the second option is
     redundant and will be removed.  */
  unsigned transparent_alias : 1;
  /* True when alias is a weakref.  */
  unsigned weakref : 1;
  /* C++ frontend produce same body aliases and extra name aliases for
     virtual functions and vtables that are obviously equivalent.
     Those aliases are bit special, especially because C++ frontend
     visibility code is so ugly it can not get them right at first time
     and their visibility needs to be copied from their "masters" at
     the end of parsing.  */
  unsigned cpp_implicit_alias : 1;
  /* Set once the definition was analyzed.  The list of references and
     other properties are built during analysis.  */
  unsigned analyzed : 1;
  /* Set for write-only variables.  */
  unsigned writeonly : 1;
  /* Visibility of symbol was used for further optimization; do not
     permit further changes.  */
  unsigned refuse_visibility_changes : 1;

  /*** Visibility and linkage flags.  ***/

  /* Set when function is visible by other units.  */
  unsigned externally_visible : 1;
  /* Don't reorder to other symbols having this set.  */
  unsigned no_reorder : 1;
  /* The symbol will be assumed to be used in an invisible way (like
     by an toplevel asm statement).  */
  unsigned force_output : 1;
  /* Like FORCE_OUTPUT, but in the case it is ABI requiring the symbol to be
     exported.  Unlike FORCE_OUTPUT this flag gets cleared to symbols promoted
     to static and it does not inhibit optimization.  */
  unsigned forced_by_abi : 1;
  /* True when the name is known to be unique and thus it does not need mangling.  */
  unsigned unique_name : 1;
  /* Specify whether the section was set by user or by
     compiler via -ffunction-sections.  */
  unsigned implicit_section : 1;
  /* True when body and other characteristics have been removed by
     symtab_remove_unreachable_nodes. */
  unsigned body_removed : 1;

  /*** WHOPR Partitioning flags.
       These flags are used at ltrans stage when only part of the callgraph is
       available. ***/

  /* Set when variable is used from other LTRANS partition.  */
  unsigned used_from_other_partition : 1;
  /* Set when function is available in the other LTRANS partition.
     During WPA output it is used to mark nodes that are present in
     multiple partitions.  */
  unsigned in_other_partition : 1;



  /*** other flags.  ***/

  /* Set when symbol has address taken. */
  unsigned address_taken : 1;
  /* Set when init priority is set.  */
  unsigned in_init_priority_hash : 1;

  /* Set when symbol needs to be streamed into LTO bytecode for LTO, or in case
     of offloading, for separate compilation for a different target.  */
  unsigned need_lto_streaming : 1;

  /* Set when symbol can be streamed into bytecode for offloading.  */
  unsigned offloadable : 1;


  /* Ordering of all symtab entries.  */
  int order;

  /* Declaration representing the symbol.  */
  tree decl;

  /* Linked list of symbol table entries starting with symtab_nodes.  */
  symtab_node *next;
  symtab_node *previous;

  /* Linked list of symbols with the same asm name.  There may be multiple
     entries for single symbol name during LTO, because symbols are renamed
     only after partitioning.

     Because inline clones are kept in the assembler name has, they also produce
     duplicate entries.

     There are also several long standing bugs where frontends and builtin
     code produce duplicated decls.  */
  symtab_node *next_sharing_asm_name;
  symtab_node *previous_sharing_asm_name;

  /* Circular list of nodes in the same comdat group if non-NULL.  */
  symtab_node *same_comdat_group;

  /* Vectors of referring and referenced entities.  */
  ipa_ref_list ref_list;

  /* Alias target. May be either DECL pointer or ASSEMBLER_NAME pointer
     depending to what was known to frontend on the creation time.
     Once alias is resolved, this pointer become NULL.  */
  tree alias_target;

  /* File stream where this node is being written to.  */
  struct lto_file_decl_data * lto_file_data;

  PTR GTY ((skip)) aux;

  /* Comdat group the symbol is in.  Can be private if GGC allowed that.  */
  tree x_comdat_group;

  /* Section name. Again can be private, if allowed.  */
  section_hash_entry *x_section;

protected:
  /* Dump base fields of symtab nodes to F.  Not to be used directly.  */
  void dump_base (FILE *);

  /* Verify common part of symtab node.  */
  bool DEBUG_FUNCTION verify_base (void);

  /* Remove node from symbol table.  This function is not used directly, but via
     cgraph/varpool node removal routines.  */
  void unregister (void);

  /* Return the initialization and finalization priority information for
     DECL.  If there is no previous priority information, a freshly
     allocated structure is returned.  */
  struct symbol_priority_map *priority_info (void);

  /* Worker for call_for_symbol_and_aliases_1.  */
  bool call_for_symbol_and_aliases_1 (bool (*callback) (symtab_node *, void *),
				      void *data,
				      bool include_overwrite);
private:
  /* Worker for set_section.  */
  static bool set_section (symtab_node *n, void *s);

  /* Worker for symtab_resolve_alias.  */
  static bool set_implicit_section (symtab_node *n, void *);

  /* Worker searching noninterposable alias.  */
  static bool noninterposable_alias (symtab_node *node, void *data);

  /* Worker for ultimate_alias_target.  */
  symtab_node *ultimate_alias_target_1 (enum availability *avail = NULL);
};

inline void
symtab_node::checking_verify_symtab_nodes (void)
{
  if (flag_checking)
    symtab_node::verify_symtab_nodes ();
}

/* Walk all aliases for NODE.  */
#define FOR_EACH_ALIAS(node, alias) \
  for (unsigned x_i = 0; node->iterate_direct_aliases (x_i, alias); x_i++)

/* This is the information that is put into the cgraph local structure
   to recover a function.  */
struct lto_file_decl_data;

extern const char * const cgraph_availability_names[];
extern const char * const ld_plugin_symbol_resolution_names[];
extern const char * const tls_model_names[];

/* Information about thunk, used only for same body aliases.  */

struct GTY(()) cgraph_thunk_info {
  /* Information about the thunk.  */
  HOST_WIDE_INT fixed_offset;
  HOST_WIDE_INT virtual_value;
  tree alias;
  bool this_adjusting;
  bool virtual_offset_p;
  bool add_pointer_bounds_args;
  /* Set to true when alias node is thunk.  */
  bool thunk_p;
};

/* Information about the function collected locally.
   Available after function is analyzed.  */

struct GTY(()) cgraph_local_info {
  /* Set when function is visible in current compilation unit only and
     its address is never taken.  */
  unsigned local : 1;

  /* False when there is something makes versioning impossible.  */
  unsigned versionable : 1;

  /* False when function calling convention and signature can not be changed.
     This is the case when __builtin_apply_args is used.  */
  unsigned can_change_signature : 1;

  /* True when the function has been originally extern inline, but it is
     redefined now.  */
  unsigned redefined_extern_inline : 1;

  /* True if the function may enter serial irrevocable mode.  */
  unsigned tm_may_enter_irr : 1;
};

/* Information about the function that needs to be computed globally
   once compilation is finished.  Available only with -funit-at-a-time.  */

struct GTY(()) cgraph_global_info {
  /* For inline clones this points to the function they will be
     inlined into.  */
  cgraph_node *inlined_to;
};

/* Represent which DECL tree (or reference to such tree)
   will be replaced by another tree while versioning.  */
struct GTY(()) ipa_replace_map
{
  /* The tree that will be replaced.  */
  tree old_tree;
  /* The new (replacing) tree.  */
  tree new_tree;
  /* Parameter number to replace, when old_tree is NULL.  */
  int parm_num;
  /* True when a substitution should be done, false otherwise.  */
  bool replace_p;
  /* True when we replace a reference to old_tree.  */
  bool ref_p;
};

struct GTY(()) cgraph_clone_info
{
  vec<ipa_replace_map *, va_gc> *tree_map;
  bitmap args_to_skip;
  bitmap combined_args_to_skip;
};

enum cgraph_simd_clone_arg_type
{
  SIMD_CLONE_ARG_TYPE_VECTOR,
  SIMD_CLONE_ARG_TYPE_UNIFORM,
  /* These are only for integer/pointer arguments passed by value.  */
  SIMD_CLONE_ARG_TYPE_LINEAR_CONSTANT_STEP,
  SIMD_CLONE_ARG_TYPE_LINEAR_VARIABLE_STEP,
  /* These 6 are only for reference type arguments or arguments passed
     by reference.  */
  SIMD_CLONE_ARG_TYPE_LINEAR_REF_CONSTANT_STEP,
  SIMD_CLONE_ARG_TYPE_LINEAR_REF_VARIABLE_STEP,
  SIMD_CLONE_ARG_TYPE_LINEAR_UVAL_CONSTANT_STEP,
  SIMD_CLONE_ARG_TYPE_LINEAR_UVAL_VARIABLE_STEP,
  SIMD_CLONE_ARG_TYPE_LINEAR_VAL_CONSTANT_STEP,
  SIMD_CLONE_ARG_TYPE_LINEAR_VAL_VARIABLE_STEP,
  SIMD_CLONE_ARG_TYPE_MASK
};

/* Function arguments in the original function of a SIMD clone.
   Supplementary data for `struct simd_clone'.  */

struct GTY(()) cgraph_simd_clone_arg {
  /* Original function argument as it originally existed in
     DECL_ARGUMENTS.  */
  tree orig_arg;

  /* orig_arg's function (or for extern functions type from
     TYPE_ARG_TYPES).  */
  tree orig_type;

  /* If argument is a vector, this holds the vector version of
     orig_arg that after adjusting the argument types will live in
     DECL_ARGUMENTS.  Otherwise, this is NULL.

     This basically holds:
       vector(simdlen) __typeof__(orig_arg) new_arg.  */
  tree vector_arg;

  /* vector_arg's type (or for extern functions new vector type.  */
  tree vector_type;

  /* If argument is a vector, this holds the array where the simd
     argument is held while executing the simd clone function.  This
     is a local variable in the cloned function.  Its content is
     copied from vector_arg upon entry to the clone.

     This basically holds:
       __typeof__(orig_arg) simd_array[simdlen].  */
  tree simd_array;

  /* A SIMD clone's argument can be either linear (constant or
     variable), uniform, or vector.  */
  enum cgraph_simd_clone_arg_type arg_type;

  /* For arg_type SIMD_CLONE_ARG_TYPE_LINEAR_*CONSTANT_STEP this is
     the constant linear step, if arg_type is
     SIMD_CLONE_ARG_TYPE_LINEAR_*VARIABLE_STEP, this is index of
     the uniform argument holding the step, otherwise 0.  */
  HOST_WIDE_INT linear_step;

  /* Variable alignment if available, otherwise 0.  */
  unsigned int alignment;
};

/* Specific data for a SIMD function clone.  */

struct GTY(()) cgraph_simd_clone {
  /* Number of words in the SIMD lane associated with this clone.  */
  unsigned int simdlen;

  /* Number of annotated function arguments in `args'.  This is
     usually the number of named arguments in FNDECL.  */
  unsigned int nargs;

  /* Max hardware vector size in bits for integral vectors.  */
  unsigned int vecsize_int;

  /* Max hardware vector size in bits for floating point vectors.  */
  unsigned int vecsize_float;

  /* Machine mode of the mask argument(s), if they are to be passed
     as bitmasks in integer argument(s).  VOIDmode if masks are passed
     as vectors of characteristic type.  */
  machine_mode mask_mode;

  /* The mangling character for a given vector size.  This is used
     to determine the ISA mangling bit as specified in the Intel
     Vector ABI.  */
  unsigned char vecsize_mangle;

  /* True if this is the masked, in-branch version of the clone,
     otherwise false.  */
  unsigned int inbranch : 1;

  /* True if this is a Cilk Plus variant.  */
  unsigned int cilk_elemental : 1;

  /* Doubly linked list of SIMD clones.  */
  cgraph_node *prev_clone, *next_clone;

  /* Original cgraph node the SIMD clones were created for.  */
  cgraph_node *origin;

  /* Annotated function arguments for the original function.  */
  cgraph_simd_clone_arg GTY((length ("%h.nargs"))) args[1];
};

/* Function Multiversioning info.  */
struct GTY((for_user)) cgraph_function_version_info {
  /* The cgraph_node for which the function version info is stored.  */
  cgraph_node *this_node;
  /* Chains all the semantically identical function versions.  The
     first function in this chain is the version_info node of the
     default function.  */
  cgraph_function_version_info *prev;
  /* If this version node corresponds to a dispatcher for function
     versions, this points to the version info node of the default
     function, the first node in the chain.  */
  cgraph_function_version_info *next;
  /* If this node corresponds to a function version, this points
     to the dispatcher function decl, which is the function that must
     be called to execute the right function version at run-time.

     If this cgraph node is a dispatcher (if dispatcher_function is
     true, in the cgraph_node struct) for function versions, this
     points to resolver function, which holds the function body of the
     dispatcher. The dispatcher decl is an alias to the resolver
     function decl.  */
  tree dispatcher_resolver;
};

#define DEFCIFCODE(code, type, string)	CIF_ ## code,
/* Reasons for inlining failures.  */

enum cgraph_inline_failed_t {
#include "cif-code.def"
  CIF_N_REASONS
};

enum cgraph_inline_failed_type_t
{
  CIF_FINAL_NORMAL = 0,
  CIF_FINAL_ERROR
};

struct cgraph_edge;

struct cgraph_edge_hasher : ggc_ptr_hash<cgraph_edge>
{
  typedef gimple *compare_type;

  static hashval_t hash (cgraph_edge *);
  static hashval_t hash (gimple *);
  static bool equal (cgraph_edge *, gimple *);
};

/* The cgraph data structure.
   Each function decl has assigned cgraph_node listing callees and callers.  */

struct GTY((tag ("SYMTAB_FUNCTION"))) cgraph_node : public symtab_node {
public:
  /* Remove the node from cgraph and all inline clones inlined into it.
     Skip however removal of FORBIDDEN_NODE and return true if it needs to be
     removed.  This allows to call the function from outer loop walking clone
     tree.  */
  bool remove_symbol_and_inline_clones (cgraph_node *forbidden_node = NULL);

  /* Record all references from cgraph_node that are taken
     in statement STMT.  */
  void record_stmt_references (gimple *stmt);

  /* Like cgraph_set_call_stmt but walk the clone tree and update all
     clones sharing the same function body.
     When WHOLE_SPECULATIVE_EDGES is true, all three components of
     speculative edge gets updated.  Otherwise we update only direct
     call.  */
  void set_call_stmt_including_clones (gimple *old_stmt, gcall *new_stmt,
				       bool update_speculative = true);

  /* Walk the alias chain to return the function cgraph_node is alias of.
     Walk through thunk, too.
     When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
  cgraph_node *function_symbol (enum availability *avail = NULL);

  /* Walk the alias chain to return the function cgraph_node is alias of.
     Walk through non virtual thunks, too.  Thus we return either a function
     or a virtual thunk node.
     When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
  cgraph_node *function_or_virtual_thunk_symbol
				(enum availability *avail = NULL);

  /* Create node representing clone of N executed COUNT times.  Decrease
     the execution counts from original node too.
     The new clone will have decl set to DECL that may or may not be the same
     as decl of N.

     When UPDATE_ORIGINAL is true, the counts are subtracted from the original
     function's profile to reflect the fact that part of execution is handled
     by node.
     When CALL_DUPLICATOIN_HOOK is true, the ipa passes are acknowledged about
     the new clone. Otherwise the caller is responsible for doing so later.

     If the new node is being inlined into another one, NEW_INLINED_TO should be
     the outline function the new one is (even indirectly) inlined to.
     All hooks will see this in node's global.inlined_to, when invoked.
     Can be NULL if the node is not inlined.  */
  cgraph_node *create_clone (tree decl, gcov_type count, int freq,
			     bool update_original,
			     vec<cgraph_edge *> redirect_callers,
			     bool call_duplication_hook,
			     cgraph_node *new_inlined_to,
			     bitmap args_to_skip);

  /* Create callgraph node clone with new declaration.  The actual body will
     be copied later at compilation stage.  */
  cgraph_node *create_virtual_clone (vec<cgraph_edge *> redirect_callers,
				     vec<ipa_replace_map *, va_gc> *tree_map,
				     bitmap args_to_skip, const char * suffix);

  /* cgraph node being removed from symbol table; see if its entry can be
   replaced by other inline clone.  */
  cgraph_node *find_replacement (void);

  /* Create a new cgraph node which is the new version of
     callgraph node.  REDIRECT_CALLERS holds the callers
     edges which should be redirected to point to
     NEW_VERSION.  ALL the callees edges of the node
     are cloned to the new version node.  Return the new
     version node.

     If non-NULL BLOCK_TO_COPY determine what basic blocks
     was copied to prevent duplications of calls that are dead
     in the clone.  */

  cgraph_node *create_version_clone (tree new_decl,
				    vec<cgraph_edge *> redirect_callers,
				    bitmap bbs_to_copy);

  /* Perform function versioning.
     Function versioning includes copying of the tree and
     a callgraph update (creating a new cgraph node and updating
     its callees and callers).

     REDIRECT_CALLERS varray includes the edges to be redirected
     to the new version.

     TREE_MAP is a mapping of tree nodes we want to replace with
     new ones (according to results of prior analysis).

     If non-NULL ARGS_TO_SKIP determine function parameters to remove
     from new version.
     If SKIP_RETURN is true, the new version will return void.
     If non-NULL BLOCK_TO_COPY determine what basic blocks to copy.
     If non_NULL NEW_ENTRY determine new entry BB of the clone.

     Return the new version's cgraph node.  */
  cgraph_node *create_version_clone_with_body
    (vec<cgraph_edge *> redirect_callers,
     vec<ipa_replace_map *, va_gc> *tree_map, bitmap args_to_skip,
     bool skip_return, bitmap bbs_to_copy, basic_block new_entry_block,
     const char *clone_name);

  /* Insert a new cgraph_function_version_info node into cgraph_fnver_htab
     corresponding to cgraph_node.  */
  cgraph_function_version_info *insert_new_function_version (void);

  /* Get the cgraph_function_version_info node corresponding to node.  */
  cgraph_function_version_info *function_version (void);

  /* Discover all functions and variables that are trivially needed, analyze
     them as well as all functions and variables referred by them  */
  void analyze (void);

  /* Add thunk alias into callgraph.  The alias declaration is ALIAS and it
     aliases DECL with an adjustments made into the first parameter.
     See comments in thunk_adjust for detail on the parameters.  */
  cgraph_node * create_thunk (tree alias, tree, bool this_adjusting,
			      HOST_WIDE_INT fixed_offset,
			      HOST_WIDE_INT virtual_value,
			      tree virtual_offset,
			      tree real_alias);


  /* Return node that alias is aliasing.  */
  inline cgraph_node *get_alias_target (void);

  /* Given function symbol, walk the alias chain to return the function node
     is alias of. Do not walk through thunks.
     When AVAILABILITY is non-NULL, get minimal availability in the chain.  */

  cgraph_node *ultimate_alias_target (availability *availability = NULL);

  /* Expand thunk NODE to gimple if possible.
     When FORCE_GIMPLE_THUNK is true, gimple thunk is created and
     no assembler is produced.
     When OUTPUT_ASM_THUNK is true, also produce assembler for
     thunks that are not lowered.  */
  bool expand_thunk (bool output_asm_thunks, bool force_gimple_thunk);

  /*  Call expand_thunk on all callers that are thunks and analyze those
      nodes that were expanded.  */
  void expand_all_artificial_thunks ();

  /* Assemble thunks and aliases associated to node.  */
  void assemble_thunks_and_aliases (void);

  /* Expand function specified by node.  */
  void expand (void);

  /* As an GCC extension we allow redefinition of the function.  The
     semantics when both copies of bodies differ is not well defined.
     We replace the old body with new body so in unit at a time mode
     we always use new body, while in normal mode we may end up with
     old body inlined into some functions and new body expanded and
     inlined in others.  */
  void reset (void);

  /* Creates a wrapper from cgraph_node to TARGET node. Thunk is used for this
     kind of wrapper method.  */
  void create_wrapper (cgraph_node *target);

  /* Verify cgraph nodes of the cgraph node.  */
  void DEBUG_FUNCTION verify_node (void);

  /* Remove function from symbol table.  */
  void remove (void);

  /* Dump call graph node to file F.  */
  void dump (FILE *f);

  /* Dump call graph node to stderr.  */
  void DEBUG_FUNCTION debug (void);

  /* When doing LTO, read cgraph_node's body from disk if it is not already
     present.  */
  bool get_untransformed_body (void);

  /* Prepare function body.  When doing LTO, read cgraph_node's body from disk 
     if it is not already present.  When some IPA transformations are scheduled,
     apply them.  */
  bool get_body (void);

  /* Release memory used to represent body of function.
     Use this only for functions that are released before being translated to
     target code (i.e. RTL).  Functions that are compiled to RTL and beyond
     are free'd in final.c via free_after_compilation().  */
  void release_body (bool keep_arguments = false);

  /* Return the DECL_STRUCT_FUNCTION of the function.  */
  struct function *get_fun (void);

  /* cgraph_node is no longer nested function; update cgraph accordingly.  */
  void unnest (void);

  /* Bring cgraph node local.  */
  void make_local (void);

  /* Likewise indicate that a node is having address taken.  */
  void mark_address_taken (void);

  /* Set fialization priority to PRIORITY.  */
  void set_fini_priority (priority_type priority);

  /* Return the finalization priority.  */
  priority_type get_fini_priority (void);

  /* Create edge from a given function to CALLEE in the cgraph.  */
  cgraph_edge *create_edge (cgraph_node *callee,
			    gcall *call_stmt, gcov_type count,
			    int freq);

  /* Create an indirect edge with a yet-undetermined callee where the call
     statement destination is a formal parameter of the caller with index
     PARAM_INDEX. */
  cgraph_edge *create_indirect_edge (gcall *call_stmt, int ecf_flags,
				     gcov_type count, int freq,
				     bool compute_indirect_info = true);

  /* Like cgraph_create_edge walk the clone tree and update all clones sharing
   same function body.  If clones already have edge for OLD_STMT; only
   update the edge same way as cgraph_set_call_stmt_including_clones does.  */
  void create_edge_including_clones (cgraph_node *callee,
				     gimple *old_stmt, gcall *stmt,
				     gcov_type count,
				     int freq,
				     cgraph_inline_failed_t reason);

  /* Return the callgraph edge representing the GIMPLE_CALL statement
     CALL_STMT.  */
  cgraph_edge *get_edge (gimple *call_stmt);

  /* Collect all callers of cgraph_node and its aliases that are known to lead
     to NODE (i.e. are not overwritable) and that are not thunks.  */
  vec<cgraph_edge *> collect_callers (void);

  /* Remove all callers from the node.  */
  void remove_callers (void);

  /* Remove all callees from the node.  */
  void remove_callees (void);

  /* Return function availability.  See cgraph.h for description of individual
     return values.  */
  enum availability get_availability (void);

  /* Set TREE_NOTHROW on cgraph_node's decl and on aliases of the node
     if any to NOTHROW.  */
  void set_nothrow_flag (bool nothrow);

  /* Set TREE_READONLY on cgraph_node's decl and on aliases of the node
     if any to READONLY.  */
  void set_const_flag (bool readonly, bool looping);

  /* Set DECL_PURE_P on cgraph_node's decl and on aliases of the node
     if any to PURE.  */
  void set_pure_flag (bool pure, bool looping);

  /* Call callback on function and aliases associated to the function.
     When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
     skipped. */

  bool call_for_symbol_and_aliases (bool (*callback) (cgraph_node *,
						      void *),
				    void *data, bool include_overwritable);

  /* Call callback on cgraph_node, thunks and aliases associated to NODE.
     When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
     skipped.  When EXCLUDE_VIRTUAL_THUNKS is true, virtual thunks are
     skipped.  */
  bool call_for_symbol_thunks_and_aliases (bool (*callback) (cgraph_node *node,
							     void *data),
					   void *data,
					   bool include_overwritable,
					   bool exclude_virtual_thunks = false);

  /* Likewise indicate that a node is needed, i.e. reachable via some
     external means.  */
  inline void mark_force_output (void);

  /* Return true when function can be marked local.  */
  bool local_p (void);

  /* Return true if cgraph_node can be made local for API change.
     Extern inline functions and C++ COMDAT functions can be made local
     at the expense of possible code size growth if function is used in multiple
     compilation units.  */
  bool can_be_local_p (void);

  /* Return true when cgraph_node can not return or throw and thus
     it is safe to ignore its side effects for IPA analysis.  */
  bool cannot_return_p (void);

  /* Return true when function cgraph_node and all its aliases are only called
     directly.
     i.e. it is not externally visible, address was not taken and
     it is not used in any other non-standard way.  */
  bool only_called_directly_p (void);

  /* Return true when function is only called directly or it has alias.
     i.e. it is not externally visible, address was not taken and
     it is not used in any other non-standard way.  */
  inline bool only_called_directly_or_aliased_p (void);

  /* Return true when function cgraph_node can be expected to be removed
     from program when direct calls in this compilation unit are removed.

     As a special case COMDAT functions are
     cgraph_can_remove_if_no_direct_calls_p while the are not
     cgraph_only_called_directly_p (it is possible they are called from other
     unit)

     This function behaves as cgraph_only_called_directly_p because eliminating
     all uses of COMDAT function does not make it necessarily disappear from
     the program unless we are compiling whole program or we do LTO.  In this
     case we know we win since dynamic linking will not really discard the
     linkonce section.  

     If WILL_INLINE is true, assume that function will be inlined into all the
     direct calls.  */
  bool will_be_removed_from_program_if_no_direct_calls_p
	 (bool will_inline = false);

  /* Return true when function can be removed from callgraph
     if all direct calls and references are eliminated.  The function does
     not take into account comdat groups.  */
  bool can_remove_if_no_direct_calls_and_refs_p (void);

  /* Return true when function cgraph_node and its aliases can be removed from
     callgraph if all direct calls are eliminated. 
     If WILL_INLINE is true, assume that function will be inlined into all the
     direct calls.  */
  bool can_remove_if_no_direct_calls_p (bool will_inline = false);

  /* Return true when callgraph node is a function with Gimple body defined
     in current unit.  Functions can also be define externally or they
     can be thunks with no Gimple representation.

     Note that at WPA stage, the function body may not be present in memory.  */
  inline bool has_gimple_body_p (void);

  /* Return true if function should be optimized for size.  */
  bool optimize_for_size_p (void);

  /* Dump the callgraph to file F.  */
  static void dump_cgraph (FILE *f);

  /* Dump the call graph to stderr.  */
  static inline
  void debug_cgraph (void)
  {
    dump_cgraph (stderr);
  }

  /* Record that DECL1 and DECL2 are semantically identical function
     versions.  */
  static void record_function_versions (tree decl1, tree decl2);

  /* Remove the cgraph_function_version_info and cgraph_node for DECL.  This
     DECL is a duplicate declaration.  */
  static void delete_function_version (tree decl);

  /* Add the function FNDECL to the call graph.
     Unlike finalize_function, this function is intended to be used
     by middle end and allows insertion of new function at arbitrary point
     of compilation.  The function can be either in high, low or SSA form
     GIMPLE.

     The function is assumed to be reachable and have address taken (so no
     API breaking optimizations are performed on it).

     Main work done by this function is to enqueue the function for later
     processing to avoid need the passes to be re-entrant.  */
  static void add_new_function (tree fndecl, bool lowered);

  /* Return callgraph node for given symbol and check it is a function. */
  static inline cgraph_node *get (const_tree decl)
  {
    gcc_checking_assert (TREE_CODE (decl) == FUNCTION_DECL);
    return dyn_cast <cgraph_node *> (symtab_node::get (decl));
  }

  /* DECL has been parsed.  Take it, queue it, compile it at the whim of the
     logic in effect.  If NO_COLLECT is true, then our caller cannot stand to
     have the garbage collector run at the moment.  We would need to either
     create a new GC context, or just not compile right now.  */
  static void finalize_function (tree, bool);

  /* Return cgraph node assigned to DECL.  Create new one when needed.  */
  static cgraph_node * create (tree decl);

  /* Try to find a call graph node for declaration DECL and if it does not
     exist or if it corresponds to an inline clone, create a new one.  */
  static cgraph_node * get_create (tree);

  /* Return local info for the compiled function.  */
  static cgraph_local_info *local_info (tree decl);

  /* Return local info for the compiled function.  */
  static struct cgraph_rtl_info *rtl_info (tree);

  /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
     Return NULL if there's no such node.  */
  static cgraph_node *get_for_asmname (tree asmname);

  /* Attempt to mark ALIAS as an alias to DECL.  Return alias node if
     successful and NULL otherwise.
     Same body aliases are output whenever the body of DECL is output,
     and cgraph_node::get (ALIAS) transparently
     returns cgraph_node::get (DECL).  */
  static cgraph_node * create_same_body_alias (tree alias, tree decl);

  /* Verify whole cgraph structure.  */
  static void DEBUG_FUNCTION verify_cgraph_nodes (void);

  /* Verify cgraph, if consistency checking is enabled.  */
  static inline void checking_verify_cgraph_nodes (void);

  /* Worker to bring NODE local.  */
  static bool make_local (cgraph_node *node, void *);

  /* Mark ALIAS as an alias to DECL.  DECL_NODE is cgraph node representing
     the function body is associated
     with (not necessarily cgraph_node (DECL).  */
  static cgraph_node *create_alias (tree alias, tree target);

  /* Return true if NODE has thunk.  */
  static bool has_thunk_p (cgraph_node *node, void *);

  cgraph_edge *callees;
  cgraph_edge *callers;
  /* List of edges representing indirect calls with a yet undetermined
     callee.  */
  cgraph_edge *indirect_calls;
  /* For nested functions points to function the node is nested in.  */
  cgraph_node *origin;
  /* Points to first nested function, if any.  */
  cgraph_node *nested;
  /* Pointer to the next function with same origin, if any.  */
  cgraph_node *next_nested;
  /* Pointer to the next clone.  */
  cgraph_node *next_sibling_clone;
  cgraph_node *prev_sibling_clone;
  cgraph_node *clones;
  cgraph_node *clone_of;
  /* If instrumentation_clone is 1 then instrumented_version points
     to the original function used to make instrumented version.
     Otherwise points to instrumented version of the function.  */
  cgraph_node *instrumented_version;
  /* If instrumentation_clone is 1 then orig_decl is the original
     function declaration.  */
  tree orig_decl;
  /* For functions with many calls sites it holds map from call expression
     to the edge to speed up cgraph_edge function.  */
  hash_table<cgraph_edge_hasher> *GTY(()) call_site_hash;
  /* Declaration node used to be clone of. */
  tree former_clone_of;

  /* If this is a SIMD clone, this points to the SIMD specific
     information for it.  */
  cgraph_simd_clone *simdclone;
  /* If this function has SIMD clones, this points to the first clone.  */
  cgraph_node *simd_clones;

  /* Interprocedural passes scheduled to have their transform functions
     applied next time we execute local pass on them.  We maintain it
     per-function in order to allow IPA passes to introduce new functions.  */
  vec<ipa_opt_pass> GTY((skip)) ipa_transforms_to_apply;

  cgraph_local_info local;
  cgraph_global_info global;
  struct cgraph_rtl_info *rtl;
  cgraph_clone_info clone;
  cgraph_thunk_info thunk;

  /* Expected number of executions: calculated in profile.c.  */
  gcov_type count;
  /* How to scale counts at materialization time; used to merge
     LTO units with different number of profile runs.  */
  int count_materialization_scale;
  /* Unique id of the node.  */
  int uid;
  /* Summary unique id of the node.  */
  int summary_uid;
  /* ID assigned by the profiling.  */
  unsigned int profile_id;
  /* Time profiler: first run of function.  */
  int tp_first_run;

  /* Set when decl is an abstract function pointed to by the
     ABSTRACT_DECL_ORIGIN of a reachable function.  */
  unsigned used_as_abstract_origin : 1;
  /* Set once the function is lowered (i.e. its CFG is built).  */
  unsigned lowered : 1;
  /* Set once the function has been instantiated and its callee
     lists created.  */
  unsigned process : 1;
  /* How commonly executed the node is.  Initialized during branch
     probabilities pass.  */
  ENUM_BITFIELD (node_frequency) frequency : 2;
  /* True when function can only be called at startup (from static ctor).  */
  unsigned only_called_at_startup : 1;
  /* True when function can only be called at startup (from static dtor).  */
  unsigned only_called_at_exit : 1;
  /* True when function is the transactional clone of a function which
     is called only from inside transactions.  */
  /* ?? We should be able to remove this.  We have enough bits in
     cgraph to calculate it.  */
  unsigned tm_clone : 1;
  /* True if this decl is a dispatcher for function versions.  */
  unsigned dispatcher_function : 1;
  /* True if this decl calls a COMDAT-local function.  This is set up in
     compute_inline_parameters and inline_call.  */
  unsigned calls_comdat_local : 1;
  /* True if node has been created by merge operation in IPA-ICF.  */
  unsigned icf_merged: 1;
  /* True when function is clone created for Pointer Bounds Checker
     instrumentation.  */
  unsigned instrumentation_clone : 1;
  /* True if call to node can't result in a call to free, munmap or
     other operation that could make previously non-trapping memory
     accesses trapping.  */
  unsigned nonfreeing_fn : 1;
  /* True if there was multiple COMDAT bodies merged by lto-symtab.  */
  unsigned merged_comdat : 1;
  /* True if function was created to be executed in parallel.  */
  unsigned parallelized_function : 1;
  /* True if function is part split out by ipa-split.  */
  unsigned split_part : 1;
  /* True if the function appears as possible target of indirect call.  */
  unsigned indirect_call_target : 1;

private:
  /* Worker for call_for_symbol_and_aliases.  */
  bool call_for_symbol_and_aliases_1 (bool (*callback) (cgraph_node *,
						        void *),
				      void *data, bool include_overwritable);
};

/* A cgraph node set is a collection of cgraph nodes.  A cgraph node
   can appear in multiple sets.  */
struct cgraph_node_set_def
{
  hash_map<cgraph_node *, size_t> *map;
  vec<cgraph_node *> nodes;
};

typedef cgraph_node_set_def *cgraph_node_set;
typedef struct varpool_node_set_def *varpool_node_set;

class varpool_node;

/* A varpool node set is a collection of varpool nodes.  A varpool node
   can appear in multiple sets.  */
struct varpool_node_set_def
{
  hash_map<varpool_node *, size_t> * map;
  vec<varpool_node *> nodes;
};

/* Iterator structure for cgraph node sets.  */
struct cgraph_node_set_iterator
{
  cgraph_node_set set;
  unsigned index;
};

/* Iterator structure for varpool node sets.  */
struct varpool_node_set_iterator
{
  varpool_node_set set;
  unsigned index;
};

/* Context of polymorphic call. It represent information about the type of
   instance that may reach the call.  This is used by ipa-devirt walkers of the
   type inheritance graph.  */

class GTY(()) ipa_polymorphic_call_context {
public:
  /* The called object appears in an object of type OUTER_TYPE
     at offset OFFSET.  When information is not 100% reliable, we
     use SPECULATIVE_OUTER_TYPE and SPECULATIVE_OFFSET. */
  HOST_WIDE_INT offset;
  HOST_WIDE_INT speculative_offset;
  tree outer_type;
  tree speculative_outer_type;
  /* True if outer object may be in construction or destruction.  */
  unsigned maybe_in_construction : 1;
  /* True if outer object may be of derived type.  */
  unsigned maybe_derived_type : 1;
  /* True if speculative outer object may be of derived type.  We always
     speculate that construction does not happen.  */
  unsigned speculative_maybe_derived_type : 1;
  /* True if the context is invalid and all calls should be redirected
     to BUILTIN_UNREACHABLE.  */
  unsigned invalid : 1;
  /* True if the outer type is dynamic.  */
  unsigned dynamic : 1;

  /* Build empty "I know nothing" context.  */
  ipa_polymorphic_call_context ();
  /* Build polymorphic call context for indirect call E.  */
  ipa_polymorphic_call_context (cgraph_edge *e);
  /* Build polymorphic call context for IP invariant CST.
     If specified, OTR_TYPE specify the type of polymorphic call
     that takes CST+OFFSET as a prameter.  */
  ipa_polymorphic_call_context (tree cst, tree otr_type = NULL,
				HOST_WIDE_INT offset = 0);
  /* Build context for pointer REF contained in FNDECL at statement STMT.
     if INSTANCE is non-NULL, return pointer to the object described by
     the context.  */
  ipa_polymorphic_call_context (tree fndecl, tree ref, gimple *stmt,
				tree *instance = NULL);

  /* Look for vtable stores or constructor calls to work out dynamic type
     of memory location.  */
  bool get_dynamic_type (tree, tree, tree, gimple *);

  /* Make context non-speculative.  */
  void clear_speculation ();

  /* Produce context specifying all derrived types of OTR_TYPE.  If OTR_TYPE is
     NULL, the context is set to dummy "I know nothing" setting.  */
  void clear_outer_type (tree otr_type = NULL);

  /* Walk container types and modify context to point to actual class
     containing OTR_TYPE (if non-NULL) as base class.
     Return true if resulting context is valid.

     When CONSIDER_PLACEMENT_NEW is false, reject contexts that may be made
     valid only via alocation of new polymorphic type inside by means
     of placement new.

     When CONSIDER_BASES is false, only look for actual fields, not base types
     of TYPE.  */
  bool restrict_to_inner_class (tree otr_type,
				bool consider_placement_new = true,
				bool consider_bases = true);

  /* Adjust all offsets in contexts by given number of bits.  */
  void offset_by (HOST_WIDE_INT);
  /* Use when we can not track dynamic type change.  This speculatively assume
     type change is not happening.  */
  void possible_dynamic_type_change (bool, tree otr_type = NULL);
  /* Assume that both THIS and a given context is valid and strenghten THIS
     if possible.  Return true if any strenghtening was made.
     If actual type the context is being used in is known, OTR_TYPE should be
     set accordingly. This improves quality of combined result.  */
  bool combine_with (ipa_polymorphic_call_context, tree otr_type = NULL);
  bool meet_with (ipa_polymorphic_call_context, tree otr_type = NULL);

  /* Return TRUE if context is fully useless.  */
  bool useless_p () const;
  /* Return TRUE if this context conveys the same information as X.  */
  bool equal_to (const ipa_polymorphic_call_context &x) const;

  /* Dump human readable context to F.  If NEWLINE is true, it will be
     terminated by a newline.  */
  void dump (FILE *f, bool newline = true) const;
  void DEBUG_FUNCTION debug () const;

  /* LTO streaming.  */
  void stream_out (struct output_block *) const;
  void stream_in (struct lto_input_block *, struct data_in *data_in);

private:
  bool combine_speculation_with (tree, HOST_WIDE_INT, bool, tree);
  bool meet_speculation_with (tree, HOST_WIDE_INT, bool, tree);
  void set_by_decl (tree, HOST_WIDE_INT);
  bool set_by_invariant (tree, tree, HOST_WIDE_INT);
  bool speculation_consistent_p (tree, HOST_WIDE_INT, bool, tree) const;
  void make_speculative (tree otr_type = NULL);
};

/* Structure containing additional information about an indirect call.  */

struct GTY(()) cgraph_indirect_call_info
{
  /* When agg_content is set, an offset where the call pointer is located
     within the aggregate.  */
  HOST_WIDE_INT offset;
  /* Context of the polymorphic call; use only when POLYMORPHIC flag is set.  */
  ipa_polymorphic_call_context context;
  /* OBJ_TYPE_REF_TOKEN of a polymorphic call (if polymorphic is set).  */
  HOST_WIDE_INT otr_token;
  /* Type of the object from OBJ_TYPE_REF_OBJECT. */
  tree otr_type;
  /* Index of the parameter that is called.  */
  int param_index;
  /* ECF flags determined from the caller.  */
  int ecf_flags;
  /* Profile_id of common target obtrained from profile.  */
  int common_target_id;
  /* Probability that call will land in function with COMMON_TARGET_ID.  */
  int common_target_probability;

  /* Set when the call is a virtual call with the parameter being the
     associated object pointer rather than a simple direct call.  */
  unsigned polymorphic : 1;
  /* Set when the call is a call of a pointer loaded from contents of an
     aggregate at offset.  */
  unsigned agg_contents : 1;
  /* Set when this is a call through a member pointer.  */
  unsigned member_ptr : 1;
  /* When the previous bit is set, this one determines whether the destination
     is loaded from a parameter passed by reference. */
  unsigned by_ref : 1;
  /* For polymorphic calls this specify whether the virtual table pointer
     may have changed in between function entry and the call.  */
  unsigned vptr_changed : 1;
};

struct GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller"),
	    for_user)) cgraph_edge {
  friend class cgraph_node;

  /* Remove the edge in the cgraph.  */
  void remove (void);

  /* Change field call_stmt of edge to NEW_STMT.
     If UPDATE_SPECULATIVE and E is any component of speculative
     edge, then update all components.  */
  void set_call_stmt (gcall *new_stmt, bool update_speculative = true);

  /* Redirect callee of the edge to N.  The function does not update underlying
     call expression.  */
  void redirect_callee (cgraph_node *n);

  /* If the edge does not lead to a thunk, simply redirect it to N.  Otherwise
     create one or more equivalent thunks for N and redirect E to the first in
     the chain.  Note that it is then necessary to call
     n->expand_all_artificial_thunks once all callers are redirected.  */
  void redirect_callee_duplicating_thunks (cgraph_node *n);

  /* Make an indirect edge with an unknown callee an ordinary edge leading to
     CALLEE.  DELTA is an integer constant that is to be added to the this
     pointer (first parameter) to compensate for skipping
     a thunk adjustment.  */
  cgraph_edge *make_direct (cgraph_node *callee);

  /* Turn edge into speculative call calling N2. Update
     the profile so the direct call is taken COUNT times
     with FREQUENCY.  */
  cgraph_edge *make_speculative (cgraph_node *n2, gcov_type direct_count,
				 int direct_frequency);

   /* Given speculative call edge, return all three components.  */
  void speculative_call_info (cgraph_edge *&direct, cgraph_edge *&indirect,
			      ipa_ref *&reference);

  /* Speculative call edge turned out to be direct call to CALLE_DECL.
     Remove the speculative call sequence and return edge representing the call.
     It is up to caller to redirect the call as appropriate. */
  cgraph_edge *resolve_speculation (tree callee_decl = NULL);

  /* If necessary, change the function declaration in the call statement
     associated with the edge so that it corresponds to the edge callee.  */
  gimple *redirect_call_stmt_to_callee (void);

  /* Create clone of edge in the node N represented
     by CALL_EXPR the callgraph.  */
  cgraph_edge * clone (cgraph_node *n, gcall *call_stmt, unsigned stmt_uid,
		       gcov_type count_scale, int freq_scale, bool update_original);

  /* Verify edge count and frequency.  */
  bool verify_count_and_frequency ();

  /* Return true when call of edge can not lead to return from caller
     and thus it is safe to ignore its side effects for IPA analysis
     when computing side effects of the caller.  */
  bool cannot_lead_to_return_p (void);

  /* Return true when the edge represents a direct recursion.  */
  bool recursive_p (void);

  /* Return true if the call can be hot.  */
  bool maybe_hot_p (void);

  /* Rebuild cgraph edges for current function node.  This needs to be run after
     passes that don't update the cgraph.  */
  static unsigned int rebuild_edges (void);

  /* Rebuild cgraph references for current function node.  This needs to be run
     after passes that don't update the cgraph.  */
  static void rebuild_references (void);

  /* Expected number of executions: calculated in profile.c.  */
  gcov_type count;
  cgraph_node *caller;
  cgraph_node *callee;
  cgraph_edge *prev_caller;
  cgraph_edge *next_caller;
  cgraph_edge *prev_callee;
  cgraph_edge *next_callee;
  gcall *call_stmt;
  /* Additional information about an indirect call.  Not cleared when an edge
     becomes direct.  */
  cgraph_indirect_call_info *indirect_info;
  PTR GTY ((skip (""))) aux;
  /* When equal to CIF_OK, inline this call.  Otherwise, points to the
     explanation why function was not inlined.  */
  enum cgraph_inline_failed_t inline_failed;
  /* The stmt_uid of call_stmt.  This is used by LTO to recover the call_stmt
     when the function is serialized in.  */
  unsigned int lto_stmt_uid;
  /* Expected frequency of executions within the function.
     When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
     per function call.  The range is 0 to CGRAPH_FREQ_MAX.  */
  int frequency;
  /* Unique id of the edge.  */
  int uid;
  /* Whether this edge was made direct by indirect inlining.  */
  unsigned int indirect_inlining_edge : 1;
  /* Whether this edge describes an indirect call with an undetermined
     callee.  */
  unsigned int indirect_unknown_callee : 1;
  /* Whether this edge is still a dangling  */
  /* True if the corresponding CALL stmt cannot be inlined.  */
  unsigned int call_stmt_cannot_inline_p : 1;
  /* Can this call throw externally?  */
  unsigned int can_throw_external : 1;
  /* Edges with SPECULATIVE flag represents indirect calls that was
     speculatively turned into direct (i.e. by profile feedback).
     The final code sequence will have form:

     if (call_target == expected_fn)
       expected_fn ();
     else
       call_target ();

     Every speculative call is represented by three components attached
     to a same call statement:
     1) a direct call (to expected_fn)
     2) an indirect call (to call_target)
     3) a IPA_REF_ADDR refrence to expected_fn.

     Optimizers may later redirect direct call to clone, so 1) and 3)
     do not need to necesarily agree with destination.  */
  unsigned int speculative : 1;
  /* Set to true when caller is a constructor or destructor of polymorphic
     type.  */
  unsigned in_polymorphic_cdtor : 1;

private:
  /* Remove the edge from the list of the callers of the callee.  */
  void remove_caller (void);

  /* Remove the edge from the list of the callees of the caller.  */
  void remove_callee (void);

  /* Set callee N of call graph edge and add it to the corresponding set of
     callers. */
  void set_callee (cgraph_node *n);

  /* Output flags of edge to a file F.  */
  void dump_edge_flags (FILE *f);

  /* Verify that call graph edge corresponds to DECL from the associated
     statement.  Return true if the verification should fail.  */
  bool verify_corresponds_to_fndecl (tree decl);
};

#define CGRAPH_FREQ_BASE 1000
#define CGRAPH_FREQ_MAX 100000

/* The varpool data structure.
   Each static variable decl has assigned varpool_node.  */

class GTY((tag ("SYMTAB_VARIABLE"))) varpool_node : public symtab_node {
public:
  /* Dump given varpool node to F.  */
  void dump (FILE *f);

  /* Dump given varpool node to stderr.  */
  void DEBUG_FUNCTION debug (void);

  /* Remove variable from symbol table.  */
  void remove (void);

  /* Remove node initializer when it is no longer needed.  */
  void remove_initializer (void);

  void analyze (void);

  /* Return variable availability.  */
  availability get_availability (void);

  /* When doing LTO, read variable's constructor from disk if
     it is not already present.  */
  tree get_constructor (void);

  /* Return true if variable has constructor that can be used for folding.  */
  bool ctor_useable_for_folding_p (void);

  /* For given variable pool node, walk the alias chain to return the function
     the variable is alias of. Do not walk through thunks.
     When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
  inline varpool_node *ultimate_alias_target
    (availability *availability = NULL);

  /* Return node that alias is aliasing.  */
  inline varpool_node *get_alias_target (void);

  /* Output one variable, if necessary.  Return whether we output it.  */
  bool assemble_decl (void);

  /* For variables in named sections make sure get_variable_section
     is called before we switch to those sections.  Then section
     conflicts between read-only and read-only requiring relocations
     sections can be resolved.  */
  void finalize_named_section_flags (void);

  /* Call calback on varpool symbol and aliases associated to varpool symbol.
     When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
     skipped. */
  bool call_for_symbol_and_aliases (bool (*callback) (varpool_node *, void *),
				    void *data,
				    bool include_overwritable);

  /* Return true when variable should be considered externally visible.  */
  bool externally_visible_p (void);

  /* Return true when all references to variable must be visible
     in ipa_ref_list.
     i.e. if the variable is not externally visible or not used in some magic
     way (asm statement or such).
     The magic uses are all summarized in force_output flag.  */
  inline bool all_refs_explicit_p ();

  /* Return true when variable can be removed from variable pool
     if all direct calls are eliminated.  */
  inline bool can_remove_if_no_refs_p (void);

  /* Add the variable DECL to the varpool.
     Unlike finalize_decl function is intended to be used
     by middle end and allows insertion of new variable at arbitrary point
     of compilation.  */
  static void add (tree decl);

  /* Return varpool node for given symbol and check it is a function. */
  static inline varpool_node *get (const_tree decl);

  /* Mark DECL as finalized.  By finalizing the declaration, frontend instruct
     the middle end to output the variable to asm file, if needed or externally
     visible.  */
  static void finalize_decl (tree decl);

  /* Attempt to mark ALIAS as an alias to DECL.  Return TRUE if successful.
     Extra name aliases are output whenever DECL is output.  */
  static varpool_node * create_extra_name_alias (tree alias, tree decl);

  /* Attempt to mark ALIAS as an alias to DECL.  Return TRUE if successful.
     Extra name aliases are output whenever DECL is output.  */
  static varpool_node * create_alias (tree, tree);

  /* Dump the variable pool to F.  */
  static void dump_varpool (FILE *f);

  /* Dump the variable pool to stderr.  */
  static void DEBUG_FUNCTION debug_varpool (void);

  /* Allocate new callgraph node and insert it into basic data structures.  */
  static varpool_node *create_empty (void);

  /* Return varpool node assigned to DECL.  Create new one when needed.  */
  static varpool_node *get_create (tree decl);

  /* Given an assembler name, lookup node.  */
  static varpool_node *get_for_asmname (tree asmname);

  /* Set when variable is scheduled to be assembled.  */
  unsigned output : 1;

  /* Set when variable has statically initialized pointer
     or is a static bounds variable and needs initalization.  */
  unsigned need_bounds_init : 1;

  /* Set if the variable is dynamically initialized, except for
     function local statics.   */
  unsigned dynamically_initialized : 1;

  ENUM_BITFIELD(tls_model) tls_model : 3;

  /* Set if the variable is known to be used by single function only.
     This is computed by ipa_signle_use pass and used by late optimizations
     in places where optimization would be valid for local static variable
     if we did not do any inter-procedural code movement.  */
  unsigned used_by_single_function : 1;

private:
  /* Assemble thunks and aliases associated to varpool node.  */
  void assemble_aliases (void);

  /* Worker for call_for_node_and_aliases.  */
  bool call_for_symbol_and_aliases_1 (bool (*callback) (varpool_node *, void *),
				      void *data,
				      bool include_overwritable);
};

/* Every top level asm statement is put into a asm_node.  */

struct GTY(()) asm_node {


  /* Next asm node.  */
  asm_node *next;
  /* String for this asm node.  */
  tree asm_str;
  /* Ordering of all cgraph nodes.  */
  int order;
};

/* Report whether or not THIS symtab node is a function, aka cgraph_node.  */

template <>
template <>
inline bool
is_a_helper <cgraph_node *>::test (symtab_node *p)
{
  return p && p->type == SYMTAB_FUNCTION;
}

/* Report whether or not THIS symtab node is a vriable, aka varpool_node.  */

template <>
template <>
inline bool
is_a_helper <varpool_node *>::test (symtab_node *p)
{
  return p && p->type == SYMTAB_VARIABLE;
}

/* Macros to access the next item in the list of free cgraph nodes and
   edges. */
#define NEXT_FREE_NODE(NODE) dyn_cast<cgraph_node *> ((NODE)->next)
#define SET_NEXT_FREE_NODE(NODE,NODE2) ((NODE))->next = NODE2
#define NEXT_FREE_EDGE(EDGE) (EDGE)->prev_caller

typedef void (*cgraph_edge_hook)(cgraph_edge *, void *);
typedef void (*cgraph_node_hook)(cgraph_node *, void *);
typedef void (*varpool_node_hook)(varpool_node *, void *);
typedef void (*cgraph_2edge_hook)(cgraph_edge *, cgraph_edge *, void *);
typedef void (*cgraph_2node_hook)(cgraph_node *, cgraph_node *, void *);

struct cgraph_edge_hook_list;
struct cgraph_node_hook_list;
struct varpool_node_hook_list;
struct cgraph_2edge_hook_list;
struct cgraph_2node_hook_list;

/* Map from a symbol to initialization/finalization priorities.  */
struct GTY(()) symbol_priority_map {
  priority_type init;
  priority_type fini;
};

enum symtab_state
{
  /* Frontend is parsing and finalizing functions.  */
  PARSING,
  /* Callgraph is being constructed.  It is safe to add new functions.  */
  CONSTRUCTION,
  /* Callgraph is being streamed-in at LTO time.  */
  LTO_STREAMING,
  /* Callgraph is built and early IPA passes are being run.  */
  IPA,
  /* Callgraph is built and all functions are transformed to SSA form.  */
  IPA_SSA,
  /* All inline decisions are done; it is now possible to remove extern inline
     functions and virtual call targets.  */
  IPA_SSA_AFTER_INLINING,
  /* Functions are now ordered and being passed to RTL expanders.  */
  EXPANSION,
  /* All cgraph expansion is done.  */
  FINISHED
};

struct asmname_hasher : ggc_ptr_hash <symtab_node>
{
  typedef const_tree compare_type;

  static hashval_t hash (symtab_node *n);
  static bool equal (symtab_node *n, const_tree t);
};

class GTY((tag ("SYMTAB"))) symbol_table
{
public:
  friend class symtab_node;
  friend class cgraph_node;
  friend class cgraph_edge;

  symbol_table (): cgraph_max_summary_uid (1)
  {
  }

  /* Initialize callgraph dump file.  */
  void initialize (void);

  /* Register a top-level asm statement ASM_STR.  */
  inline asm_node *finalize_toplevel_asm (tree asm_str);

  /* Analyze the whole compilation unit once it is parsed completely.  */
  void finalize_compilation_unit (void);

  /* C++ frontend produce same body aliases all over the place, even before PCH
     gets streamed out. It relies on us linking the aliases with their function
     in order to do the fixups, but ipa-ref is not PCH safe.  Consequentely we
     first produce aliases without links, but once C++ FE is sure he won't sream
     PCH we build the links via this function.  */
  void process_same_body_aliases (void);

  /* Perform simple optimizations based on callgraph.  */
  void compile (void);

  /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these
     functions into callgraph in a way so they look like ordinary reachable
     functions inserted into callgraph already at construction time.  */
  void process_new_functions (void);

  /* Once all functions from compilation unit are in memory, produce all clones
     and update all calls.  We might also do this on demand if we don't want to
     bring all functions to memory prior compilation, but current WHOPR
     implementation does that and it is bit easier to keep everything right
     in this order.  */
  void materialize_all_clones (void);

  /* Register a symbol NODE.  */
  inline void register_symbol (symtab_node *node);

  inline void
  clear_asm_symbols (void)
  {
    asmnodes = NULL;
    asm_last_node = NULL;
  }

  /* Perform reachability analysis and reclaim all unreachable nodes.  */
  bool remove_unreachable_nodes (FILE *file);

  /* Optimization of function bodies might've rendered some variables as
     unnecessary so we want to avoid these from being compiled.  Re-do
     reachability starting from variables that are either externally visible
     or was referred from the asm output routines.  */
  void remove_unreferenced_decls (void);

  /* Unregister a symbol NODE.  */
  inline void unregister (symtab_node *node);

  /* Allocate new callgraph node and insert it into basic data structures.  */
  cgraph_node *create_empty (void);

  /* Release a callgraph NODE with UID and put in to the list
     of free nodes.  */
  void release_symbol (cgraph_node *node, int uid);

  /* Output all variables enqueued to be assembled.  */
  bool output_variables (void);

  /* Weakrefs may be associated to external decls and thus not output
     at expansion time.  Emit all necessary aliases.  */
  void output_weakrefs (void);

  /* Return first static symbol with definition.  */
  inline symtab_node *first_symbol (void);

  /* Return first assembler symbol.  */
  inline asm_node *
  first_asm_symbol (void)
  {
    return asmnodes;
  }

  /* Return first static symbol with definition.  */
  inline symtab_node *first_defined_symbol (void);

  /* Return first variable.  */
  inline varpool_node *first_variable (void);

  /* Return next variable after NODE.  */
  inline varpool_node *next_variable (varpool_node *node);

  /* Return first static variable with initializer.  */
  inline varpool_node *first_static_initializer (void);

  /* Return next static variable with initializer after NODE.  */
  inline varpool_node *next_static_initializer (varpool_node *node);

  /* Return first static variable with definition.  */
  inline varpool_node *first_defined_variable (void);

  /* Return next static variable with definition after NODE.  */
  inline varpool_node *next_defined_variable (varpool_node *node);

  /* Return first function with body defined.  */
  inline cgraph_node *first_defined_function (void);

  /* Return next function with body defined after NODE.  */
  inline cgraph_node *next_defined_function (cgraph_node *node);

  /* Return first function.  */
  inline cgraph_node *first_function (void);

  /* Return next function.  */
  inline cgraph_node *next_function (cgraph_node *node);

  /* Return first function with body defined.  */
  cgraph_node *first_function_with_gimple_body (void);

  /* Return next reachable static variable with initializer after NODE.  */
  inline cgraph_node *next_function_with_gimple_body (cgraph_node *node);

  /* Register HOOK to be called with DATA on each removed edge.  */
  cgraph_edge_hook_list *add_edge_removal_hook (cgraph_edge_hook hook,
						void *data);

  /* Remove ENTRY from the list of hooks called on removing edges.  */
  void remove_edge_removal_hook (cgraph_edge_hook_list *entry);

  /* Register HOOK to be called with DATA on each removed node.  */
  cgraph_node_hook_list *add_cgraph_removal_hook (cgraph_node_hook hook,
						  void *data);

  /* Remove ENTRY from the list of hooks called on removing nodes.  */
  void remove_cgraph_removal_hook (cgraph_node_hook_list *entry);

  /* Register HOOK to be called with DATA on each removed node.  */
  varpool_node_hook_list *add_varpool_removal_hook (varpool_node_hook hook,
						    void *data);

  /* Remove ENTRY from the list of hooks called on removing nodes.  */
  void remove_varpool_removal_hook (varpool_node_hook_list *entry);

  /* Register HOOK to be called with DATA on each inserted node.  */
  cgraph_node_hook_list *add_cgraph_insertion_hook (cgraph_node_hook hook,
						    void *data);

  /* Remove ENTRY from the list of hooks called on inserted nodes.  */
  void remove_cgraph_insertion_hook (cgraph_node_hook_list *entry);

  /* Register HOOK to be called with DATA on each inserted node.  */
  varpool_node_hook_list *add_varpool_insertion_hook (varpool_node_hook hook,
						      void *data);

  /* Remove ENTRY from the list of hooks called on inserted nodes.  */
  void remove_varpool_insertion_hook (varpool_node_hook_list *entry);

  /* Register HOOK to be called with DATA on each duplicated edge.  */
  cgraph_2edge_hook_list *add_edge_duplication_hook (cgraph_2edge_hook hook,
						     void *data);
  /* Remove ENTRY from the list of hooks called on duplicating edges.  */
  void remove_edge_duplication_hook (cgraph_2edge_hook_list *entry);

  /* Register HOOK to be called with DATA on each duplicated node.  */
  cgraph_2node_hook_list *add_cgraph_duplication_hook (cgraph_2node_hook hook,
						       void *data);

  /* Remove ENTRY from the list of hooks called on duplicating nodes.  */
  void remove_cgraph_duplication_hook (cgraph_2node_hook_list *entry);

  /* Call all edge removal hooks.  */
  void call_edge_removal_hooks (cgraph_edge *e);

  /* Call all node insertion hooks.  */
  void call_cgraph_insertion_hooks (cgraph_node *node);

  /* Call all node removal hooks.  */
  void call_cgraph_removal_hooks (cgraph_node *node);

  /* Call all node duplication hooks.  */
  void call_cgraph_duplication_hooks (cgraph_node *node, cgraph_node *node2);

  /* Call all edge duplication hooks.  */
  void call_edge_duplication_hooks (cgraph_edge *cs1, cgraph_edge *cs2);

  /* Call all node removal hooks.  */
  void call_varpool_removal_hooks (varpool_node *node);

  /* Call all node insertion hooks.  */
  void call_varpool_insertion_hooks (varpool_node *node);

  /* Arrange node to be first in its entry of assembler_name_hash.  */
  void symtab_prevail_in_asm_name_hash (symtab_node *node);

  /* Initalize asm name hash unless.  */
  void symtab_initialize_asm_name_hash (void);

  /* Set the DECL_ASSEMBLER_NAME and update symtab hashtables.  */
  void change_decl_assembler_name (tree decl, tree name);

  /* Return true if assembler names NAME1 and NAME2 leads to the same symbol
     name.  */
  static bool assembler_names_equal_p (const char *name1, const char *name2);

  int cgraph_count;
  int cgraph_max_uid;
  int cgraph_max_summary_uid;

  int edges_count;
  int edges_max_uid;

  symtab_node* GTY(()) nodes;
  asm_node* GTY(()) asmnodes;
  asm_node* GTY(()) asm_last_node;
  cgraph_node* GTY(()) free_nodes;

  /* Head of a linked list of unused (freed) call graph edges.
     Do not GTY((delete)) this list so UIDs gets reliably recycled.  */
  cgraph_edge * GTY(()) free_edges;

  /* The order index of the next symtab node to be created.  This is
     used so that we can sort the cgraph nodes in order by when we saw
     them, to support -fno-toplevel-reorder.  */
  int order;

  /* Set when whole unit has been analyzed so we can access global info.  */
  bool global_info_ready;
  /* What state callgraph is in right now.  */
  enum symtab_state state;
  /* Set when the cgraph is fully build and the basic flags are computed.  */
  bool function_flags_ready;

  bool cpp_implicit_aliases_done;

  /* Hash table used to hold sectoons.  */
  hash_table<section_name_hasher> *GTY(()) section_hash;

  /* Hash table used to convert assembler names into nodes.  */
  hash_table<asmname_hasher> *assembler_name_hash;

  /* Hash table used to hold init priorities.  */
  hash_map<symtab_node *, symbol_priority_map> *init_priority_hash;

  FILE* GTY ((skip)) dump_file;

  /* Return symbol used to separate symbol name from suffix.  */
  static char symbol_suffix_separator ();

private:
  /* Allocate new callgraph node.  */
  inline cgraph_node * allocate_cgraph_symbol (void);

  /* Allocate a cgraph_edge structure and fill it with data according to the
     parameters of which only CALLEE can be NULL (when creating an indirect call
     edge).  */
  cgraph_edge *create_edge (cgraph_node *caller, cgraph_node *callee,
			    gcall *call_stmt, gcov_type count, int freq,
			    bool indir_unknown_callee);

  /* Put the edge onto the free list.  */
  void free_edge (cgraph_edge *e);

  /* Insert NODE to assembler name hash.  */
  void insert_to_assembler_name_hash (symtab_node *node, bool with_clones);

  /* Remove NODE from assembler name hash.  */
  void unlink_from_assembler_name_hash (symtab_node *node, bool with_clones);

  /* Hash asmnames ignoring the user specified marks.  */
  static hashval_t decl_assembler_name_hash (const_tree asmname);

  /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL.  */
  static bool decl_assembler_name_equal (tree decl, const_tree asmname);

  friend struct asmname_hasher;

  /* List of hooks triggered when an edge is removed.  */
  cgraph_edge_hook_list * GTY((skip)) m_first_edge_removal_hook;
  /* List of hooks triggem_red when a cgraph node is removed.  */
  cgraph_node_hook_list * GTY((skip)) m_first_cgraph_removal_hook;
  /* List of hooks triggered when an edge is duplicated.  */
  cgraph_2edge_hook_list * GTY((skip)) m_first_edge_duplicated_hook;
  /* List of hooks triggered when a node is duplicated.  */
  cgraph_2node_hook_list * GTY((skip)) m_first_cgraph_duplicated_hook;
  /* List of hooks triggered when an function is inserted.  */
  cgraph_node_hook_list * GTY((skip)) m_first_cgraph_insertion_hook;
  /* List of hooks triggered when an variable is inserted.  */
  varpool_node_hook_list * GTY((skip)) m_first_varpool_insertion_hook;
  /* List of hooks triggered when a node is removed.  */
  varpool_node_hook_list * GTY((skip)) m_first_varpool_removal_hook;
};

extern GTY(()) symbol_table *symtab;

extern vec<cgraph_node *> cgraph_new_nodes;

inline hashval_t
asmname_hasher::hash (symtab_node *n)
{
  return symbol_table::decl_assembler_name_hash
    (DECL_ASSEMBLER_NAME (n->decl));
}

inline bool
asmname_hasher::equal (symtab_node *n, const_tree t)
{
  return symbol_table::decl_assembler_name_equal (n->decl, t);
}

/* In cgraph.c  */
void cgraph_c_finalize (void);
void release_function_body (tree);
cgraph_indirect_call_info *cgraph_allocate_init_indirect_info (void);

void cgraph_update_edges_for_call_stmt (gimple *, tree, gimple *);
bool cgraph_function_possibly_inlined_p (tree);

const char* cgraph_inline_failed_string (cgraph_inline_failed_t);
cgraph_inline_failed_type_t cgraph_inline_failed_type (cgraph_inline_failed_t);

extern bool gimple_check_call_matching_types (gimple *, tree, bool);

/* In cgraphunit.c  */
void cgraphunit_c_finalize (void);

/*  Initialize datastructures so DECL is a function in lowered gimple form.
    IN_SSA is true if the gimple is in SSA.  */
basic_block init_lowered_empty_function (tree, bool, gcov_type);

/* In cgraphclones.c  */

tree clone_function_name_1 (const char *, const char *);
tree clone_function_name (tree decl, const char *);

void tree_function_versioning (tree, tree, vec<ipa_replace_map *, va_gc> *,
			       bool, bitmap, bool, bitmap, basic_block);

/* In cgraphbuild.c  */
int compute_call_stmt_bb_frequency (tree, basic_block bb);
void record_references_in_initializer (tree, bool);

/* In ipa.c  */
void cgraph_build_static_cdtor (char which, tree body, int priority);
bool ipa_discover_readonly_nonaddressable_vars (void);

/* In varpool.c  */
tree ctor_for_folding (tree);

/* In tree-chkp.c  */
extern bool chkp_function_instrumented_p (tree fndecl);

/* Return true when the symbol is real symbol, i.e. it is not inline clone
   or abstract function kept for debug info purposes only.  */
inline bool
symtab_node::real_symbol_p (void)
{
  cgraph_node *cnode;

  if (DECL_ABSTRACT_P (decl))
    return false;
  if (transparent_alias && definition)
    return false;
  if (!is_a <cgraph_node *> (this))
    return true;
  cnode = dyn_cast <cgraph_node *> (this);
  if (cnode->global.inlined_to)
    return false;
  return true;
}

/* Return true if DECL should have entry in symbol table if used.
   Those are functions and static & external veriables*/

static inline bool
decl_in_symtab_p (const_tree decl)
{
  return (TREE_CODE (decl) == FUNCTION_DECL
          || (TREE_CODE (decl) == VAR_DECL
	      && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))));
}

inline bool
symtab_node::in_same_comdat_group_p (symtab_node *target)
{
  symtab_node *source = this;

  if (cgraph_node *cn = dyn_cast <cgraph_node *> (target))
    {
      if (cn->global.inlined_to)
	source = cn->global.inlined_to;
    }
  if (cgraph_node *cn = dyn_cast <cgraph_node *> (target))
    {
      if (cn->global.inlined_to)
	target = cn->global.inlined_to;
    }

  return source->get_comdat_group () == target->get_comdat_group ();
}

/* Return node that alias is aliasing.  */

inline symtab_node *
symtab_node::get_alias_target (void)
{
  ipa_ref *ref = NULL;
  iterate_reference (0, ref);
  if (ref->use == IPA_REF_CHKP)
    iterate_reference (1, ref);
  gcc_checking_assert (ref->use == IPA_REF_ALIAS);
  return ref->referred;
}

/* Return next reachable static symbol with initializer after the node.  */

inline symtab_node *
symtab_node::next_defined_symbol (void)
{
  symtab_node *node1 = next;

  for (; node1; node1 = node1->next)
    if (node1->definition)
      return node1;

  return NULL;
}

/* Iterates I-th reference in the list, REF is also set.  */

inline ipa_ref *
symtab_node::iterate_reference (unsigned i, ipa_ref *&ref)
{
  vec_safe_iterate (ref_list.references, i, &ref);

  return ref;
}

/* Iterates I-th referring item in the list, REF is also set.  */

inline ipa_ref *
symtab_node::iterate_referring (unsigned i, ipa_ref *&ref)
{
  ref_list.referring.iterate (i, &ref);

  return ref;
}

/* Iterates I-th referring alias item in the list, REF is also set.  */

inline ipa_ref *
symtab_node::iterate_direct_aliases (unsigned i, ipa_ref *&ref)
{
  ref_list.referring.iterate (i, &ref);

  if (ref && ref->use != IPA_REF_ALIAS)
    return NULL;

  return ref;
}

/* Return true if list contains an alias.  */

inline bool
symtab_node::has_aliases_p (void)
{
  ipa_ref *ref = NULL;

  return (iterate_direct_aliases (0, ref) != NULL);
}

/* Return true when RESOLUTION indicate that linker will use
   the symbol from non-LTO object files.  */

inline bool
resolution_used_from_other_file_p (enum ld_plugin_symbol_resolution resolution)
{
  return (resolution == LDPR_PREVAILING_DEF
	  || resolution == LDPR_PREEMPTED_REG
	  || resolution == LDPR_RESOLVED_EXEC
	  || resolution == LDPR_RESOLVED_DYN);
}

/* Return true when symtab_node is known to be used from other (non-LTO)
   object file. Known only when doing LTO via linker plugin.  */

inline bool
symtab_node::used_from_object_file_p (void)
{
  if (!TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
    return false;
  if (resolution_used_from_other_file_p (resolution))
    return true;
  return false;
}

/* Return varpool node for given symbol and check it is a function. */

inline varpool_node *
varpool_node::get (const_tree decl)
{
  gcc_checking_assert (TREE_CODE (decl) == VAR_DECL);
  return dyn_cast<varpool_node *> (symtab_node::get (decl));
}

/* Register a symbol NODE.  */

inline void
symbol_table::register_symbol (symtab_node *node)
{
  node->next = nodes;
  node->previous = NULL;

  if (nodes)
    nodes->previous = node;
  nodes = node;

  node->order = order++;
}

/* Register a top-level asm statement ASM_STR.  */

asm_node *
symbol_table::finalize_toplevel_asm (tree asm_str)
{
  asm_node *node;

  node = ggc_cleared_alloc<asm_node> ();
  node->asm_str = asm_str;
  node->order = order++;
  node->next = NULL;

  if (asmnodes == NULL)
    asmnodes = node;
  else
    asm_last_node->next = node;

  asm_last_node = node;
  return node;
}

/* Unregister a symbol NODE.  */
inline void
symbol_table::unregister (symtab_node *node)
{
  if (node->previous)
    node->previous->next = node->next;
  else
    nodes = node->next;

  if (node->next)
    node->next->previous = node->previous;

  node->next = NULL;
  node->previous = NULL;
}

/* Release a callgraph NODE with UID and put in to the list of free nodes.  */

inline void
symbol_table::release_symbol (cgraph_node *node, int uid)
{
  cgraph_count--;

  /* Clear out the node to NULL all pointers and add the node to the free
     list.  */
  memset (node, 0, sizeof (*node));
  node->type = SYMTAB_FUNCTION;
  node->uid = uid;
  SET_NEXT_FREE_NODE (node, free_nodes);
  free_nodes = node;
}

/* Allocate new callgraph node.  */

inline cgraph_node *
symbol_table::allocate_cgraph_symbol (void)
{
  cgraph_node *node;

  if (free_nodes)
    {
      node = free_nodes;
      free_nodes = NEXT_FREE_NODE (node);
    }
  else
    {
      node = ggc_cleared_alloc<cgraph_node> ();
      node->uid = cgraph_max_uid++;
    }

  node->summary_uid = cgraph_max_summary_uid++;
  return node;
}


/* Return first static symbol with definition.  */
inline symtab_node *
symbol_table::first_symbol (void)
{
  return nodes;
}

/* Walk all symbols.  */
#define FOR_EACH_SYMBOL(node) \
   for ((node) = symtab->first_symbol (); (node); (node) = (node)->next)

/* Return first static symbol with definition.  */
inline symtab_node *
symbol_table::first_defined_symbol (void)
{
  symtab_node *node;

  for (node = nodes; node; node = node->next)
    if (node->definition)
      return node;

  return NULL;
}

/* Walk all symbols with definitions in current unit.  */
#define FOR_EACH_DEFINED_SYMBOL(node) \
   for ((node) = symtab->first_defined_symbol (); (node); \
	(node) = node->next_defined_symbol ())

/* Return first variable.  */
inline varpool_node *
symbol_table::first_variable (void)
{
  symtab_node *node;
  for (node = nodes; node; node = node->next)
    if (varpool_node *vnode = dyn_cast <varpool_node *> (node))
      return vnode;
  return NULL;
}

/* Return next variable after NODE.  */
inline varpool_node *
symbol_table::next_variable (varpool_node *node)
{
  symtab_node *node1 = node->next;
  for (; node1; node1 = node1->next)
    if (varpool_node *vnode1 = dyn_cast <varpool_node *> (node1))
      return vnode1;
  return NULL;
}
/* Walk all variables.  */
#define FOR_EACH_VARIABLE(node) \
   for ((node) = symtab->first_variable (); \
        (node); \
	(node) = symtab->next_variable ((node)))

/* Return first static variable with initializer.  */
inline varpool_node *
symbol_table::first_static_initializer (void)
{
  symtab_node *node;
  for (node = nodes; node; node = node->next)
    {
      varpool_node *vnode = dyn_cast <varpool_node *> (node);
      if (vnode && DECL_INITIAL (node->decl))
	return vnode;
    }
  return NULL;
}

/* Return next static variable with initializer after NODE.  */
inline varpool_node *
symbol_table::next_static_initializer (varpool_node *node)
{
  symtab_node *node1 = node->next;
  for (; node1; node1 = node1->next)
    {
      varpool_node *vnode1 = dyn_cast <varpool_node *> (node1);
      if (vnode1 && DECL_INITIAL (node1->decl))
	return vnode1;
    }
  return NULL;
}

/* Walk all static variables with initializer set.  */
#define FOR_EACH_STATIC_INITIALIZER(node) \
   for ((node) = symtab->first_static_initializer (); (node); \
	(node) = symtab->next_static_initializer (node))

/* Return first static variable with definition.  */
inline varpool_node *
symbol_table::first_defined_variable (void)
{
  symtab_node *node;
  for (node = nodes; node; node = node->next)
    {
      varpool_node *vnode = dyn_cast <varpool_node *> (node);
      if (vnode && vnode->definition)
	return vnode;
    }
  return NULL;
}

/* Return next static variable with definition after NODE.  */
inline varpool_node *
symbol_table::next_defined_variable (varpool_node *node)
{
  symtab_node *node1 = node->next;
  for (; node1; node1 = node1->next)
    {
      varpool_node *vnode1 = dyn_cast <varpool_node *> (node1);
      if (vnode1 && vnode1->definition)
	return vnode1;
    }
  return NULL;
}
/* Walk all variables with definitions in current unit.  */
#define FOR_EACH_DEFINED_VARIABLE(node) \
   for ((node) = symtab->first_defined_variable (); (node); \
	(node) = symtab->next_defined_variable (node))

/* Return first function with body defined.  */
inline cgraph_node *
symbol_table::first_defined_function (void)
{
  symtab_node *node;
  for (node = nodes; node; node = node->next)
    {
      cgraph_node *cn = dyn_cast <cgraph_node *> (node);
      if (cn && cn->definition)
	return cn;
    }
  return NULL;
}

/* Return next function with body defined after NODE.  */
inline cgraph_node *
symbol_table::next_defined_function (cgraph_node *node)
{
  symtab_node *node1 = node->next;
  for (; node1; node1 = node1->next)
    {
      cgraph_node *cn1 = dyn_cast <cgraph_node *> (node1);
      if (cn1 && cn1->definition)
	return cn1;
    }
  return NULL;
}

/* Walk all functions with body defined.  */
#define FOR_EACH_DEFINED_FUNCTION(node) \
   for ((node) = symtab->first_defined_function (); (node); \
	(node) = symtab->next_defined_function ((node)))

/* Return first function.  */
inline cgraph_node *
symbol_table::first_function (void)
{
  symtab_node *node;
  for (node = nodes; node; node = node->next)
    if (cgraph_node *cn = dyn_cast <cgraph_node *> (node))
      return cn;
  return NULL;
}

/* Return next function.  */
inline cgraph_node *
symbol_table::next_function (cgraph_node *node)
{
  symtab_node *node1 = node->next;
  for (; node1; node1 = node1->next)
    if (cgraph_node *cn1 = dyn_cast <cgraph_node *> (node1))
      return cn1;
  return NULL;
}

/* Return first function with body defined.  */
inline cgraph_node *
symbol_table::first_function_with_gimple_body (void)
{
  symtab_node *node;
  for (node = nodes; node; node = node->next)
    {
      cgraph_node *cn = dyn_cast <cgraph_node *> (node);
      if (cn && cn->has_gimple_body_p ())
	return cn;
    }
  return NULL;
}

/* Return next reachable static variable with initializer after NODE.  */
inline cgraph_node *
symbol_table::next_function_with_gimple_body (cgraph_node *node)
{
  symtab_node *node1 = node->next;
  for (; node1; node1 = node1->next)
    {
      cgraph_node *cn1 = dyn_cast <cgraph_node *> (node1);
      if (cn1 && cn1->has_gimple_body_p ())
	return cn1;
    }
  return NULL;
}

/* Walk all functions.  */
#define FOR_EACH_FUNCTION(node) \
   for ((node) = symtab->first_function (); (node); \
	(node) = symtab->next_function ((node)))

/* Return true when callgraph node is a function with Gimple body defined
   in current unit.  Functions can also be define externally or they
   can be thunks with no Gimple representation.

   Note that at WPA stage, the function body may not be present in memory.  */

inline bool
cgraph_node::has_gimple_body_p (void)
{
  return definition && !thunk.thunk_p && !alias;
}

/* Walk all functions with body defined.  */
#define FOR_EACH_FUNCTION_WITH_GIMPLE_BODY(node) \
   for ((node) = symtab->first_function_with_gimple_body (); (node); \
	(node) = symtab->next_function_with_gimple_body (node))

/* Uniquize all constants that appear in memory.
   Each constant in memory thus far output is recorded
   in `const_desc_table'.  */

struct GTY((for_user)) constant_descriptor_tree {
  /* A MEM for the constant.  */
  rtx rtl;

  /* The value of the constant.  */
  tree value;

  /* Hash of value.  Computing the hash from value each time
     hashfn is called can't work properly, as that means recursive
     use of the hash table during hash table expansion.  */
  hashval_t hash;
};

/* Return true when function is only called directly or it has alias.
   i.e. it is not externally visible, address was not taken and
   it is not used in any other non-standard way.  */

inline bool
cgraph_node::only_called_directly_or_aliased_p (void)
{
  gcc_assert (!global.inlined_to);
  return (!force_output && !address_taken
	  && !used_from_other_partition
	  && !DECL_VIRTUAL_P (decl)
	  && !DECL_STATIC_CONSTRUCTOR (decl)
	  && !DECL_STATIC_DESTRUCTOR (decl)
	  && !used_from_object_file_p ()
	  && !externally_visible);
}

/* Return true when function can be removed from callgraph
   if all direct calls are eliminated.  */

inline bool
cgraph_node::can_remove_if_no_direct_calls_and_refs_p (void)
{
  gcc_checking_assert (!global.inlined_to);
  /* Instrumentation clones should not be removed before
     instrumentation happens.  New callers may appear after
     instrumentation.  */
  if (instrumentation_clone
      && !chkp_function_instrumented_p (decl))
    return false;
  /* Extern inlines can always go, we will use the external definition.  */
  if (DECL_EXTERNAL (decl))
    return true;
  /* When function is needed, we can not remove it.  */
  if (force_output || used_from_other_partition)
    return false;
  if (DECL_STATIC_CONSTRUCTOR (decl)
      || DECL_STATIC_DESTRUCTOR (decl))
    return false;
  /* Only COMDAT functions can be removed if externally visible.  */
  if (externally_visible
      && (!DECL_COMDAT (decl)
	  || forced_by_abi
	  || used_from_object_file_p ()))
    return false;
  return true;
}

/* Verify cgraph, if consistency checking is enabled.  */

inline void
cgraph_node::checking_verify_cgraph_nodes (void)
{
  if (flag_checking)
    cgraph_node::verify_cgraph_nodes ();
}

/* Return true when variable can be removed from variable pool
   if all direct calls are eliminated.  */

inline bool
varpool_node::can_remove_if_no_refs_p (void)
{
  if (DECL_EXTERNAL (decl))
    return true;
  return (!force_output && !used_from_other_partition
	  && ((DECL_COMDAT (decl)
	       && !forced_by_abi
	       && !used_from_object_file_p ())
	      || !externally_visible
	      || DECL_HAS_VALUE_EXPR_P (decl)));
}

/* Return true when all references to variable must be visible in ipa_ref_list.
   i.e. if the variable is not externally visible or not used in some magic
   way (asm statement or such).
   The magic uses are all summarized in force_output flag.  */

inline bool
varpool_node::all_refs_explicit_p ()
{
  return (definition
	  && !externally_visible
	  && !used_from_other_partition
	  && !force_output);
}

struct tree_descriptor_hasher : ggc_ptr_hash<constant_descriptor_tree>
{
  static hashval_t hash (constant_descriptor_tree *);
  static bool equal (constant_descriptor_tree *, constant_descriptor_tree *);
};

/* Constant pool accessor function.  */
hash_table<tree_descriptor_hasher> *constant_pool_htab (void);

/* Return node that alias is aliasing.  */

inline cgraph_node *
cgraph_node::get_alias_target (void)
{
  return dyn_cast <cgraph_node *> (symtab_node::get_alias_target ());
}

/* Return node that alias is aliasing.  */

inline varpool_node *
varpool_node::get_alias_target (void)
{
  return dyn_cast <varpool_node *> (symtab_node::get_alias_target ());
}

/* Walk the alias chain to return the symbol NODE is alias of.
   If NODE is not an alias, return NODE.
   When AVAILABILITY is non-NULL, get minimal availability in the chain.  */

inline symtab_node *
symtab_node::ultimate_alias_target (enum availability *availability)
{
  if (!alias)
    {
      if (availability)
	*availability = get_availability ();
      return this;
    }

  return ultimate_alias_target_1 (availability);
}

/* Given function symbol, walk the alias chain to return the function node
   is alias of. Do not walk through thunks.
   When AVAILABILITY is non-NULL, get minimal availability in the chain.  */

inline cgraph_node *
cgraph_node::ultimate_alias_target (enum availability *availability)
{
  cgraph_node *n = dyn_cast <cgraph_node *>
    (symtab_node::ultimate_alias_target (availability));
  if (!n && availability)
    *availability = AVAIL_NOT_AVAILABLE;
  return n;
}

/* For given variable pool node, walk the alias chain to return the function
   the variable is alias of. Do not walk through thunks.
   When AVAILABILITY is non-NULL, get minimal availability in the chain.  */

inline varpool_node *
varpool_node::ultimate_alias_target (availability *availability)
{
  varpool_node *n = dyn_cast <varpool_node *>
    (symtab_node::ultimate_alias_target (availability));

  if (!n && availability)
    *availability = AVAIL_NOT_AVAILABLE;
  return n;
}

/* Set callee N of call graph edge and add it to the corresponding set of
   callers. */

inline void
cgraph_edge::set_callee (cgraph_node *n)
{
  prev_caller = NULL;
  if (n->callers)
    n->callers->prev_caller = this;
  next_caller = n->callers;
  n->callers = this;
  callee = n;
}

/* Redirect callee of the edge to N.  The function does not update underlying
   call expression.  */

inline void
cgraph_edge::redirect_callee (cgraph_node *n)
{
  /* Remove from callers list of the current callee.  */
  remove_callee ();

  /* Insert to callers list of the new callee.  */
  set_callee (n);
}

/* Return true when the edge represents a direct recursion.  */

inline bool
cgraph_edge::recursive_p (void)
{
  cgraph_node *c = callee->ultimate_alias_target ();
  if (caller->global.inlined_to)
    return caller->global.inlined_to->decl == c->decl;
  else
    return caller->decl == c->decl;
}

/* Remove the edge from the list of the callers of the callee.  */

inline void
cgraph_edge::remove_callee (void)
{
  gcc_assert (!indirect_unknown_callee);
  if (prev_caller)
    prev_caller->next_caller = next_caller;
  if (next_caller)
    next_caller->prev_caller = prev_caller;
  if (!prev_caller)
    callee->callers = next_caller;
}

/* Return true if the TM_CLONE bit is set for a given FNDECL.  */
static inline bool
decl_is_tm_clone (const_tree fndecl)
{
  cgraph_node *n = cgraph_node::get (fndecl);
  if (n)
    return n->tm_clone;
  return false;
}

/* Likewise indicate that a node is needed, i.e. reachable via some
   external means.  */

inline void
cgraph_node::mark_force_output (void)
{
  force_output = 1;
  gcc_checking_assert (!global.inlined_to);
}

/* Return true if function should be optimized for size.  */

inline bool
cgraph_node::optimize_for_size_p (void)
{
  if (opt_for_fn (decl, optimize_size))
    return true;
  if (frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED)
    return true;
  else
    return false;
}

/* Return symtab_node for NODE or create one if it is not present
   in symtab.  */

inline symtab_node *
symtab_node::get_create (tree node)
{
  if (TREE_CODE (node) == VAR_DECL)
    return varpool_node::get_create (node);
  else
    return cgraph_node::get_create (node);
}

/* Return availability of NODE.  */

inline enum availability
symtab_node::get_availability (void)
{
  if (is_a <cgraph_node *> (this))
    return dyn_cast <cgraph_node *> (this)->get_availability ();
  else
    return dyn_cast <varpool_node *> (this)->get_availability ();
}

/* Call calback on symtab node and aliases associated to this node.
   When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
   skipped. */

inline bool
symtab_node::call_for_symbol_and_aliases (bool (*callback) (symtab_node *,
							    void *),
					  void *data,
					  bool include_overwritable)
{
  if (callback (this, data))
    return true;
  if (has_aliases_p ())
    return call_for_symbol_and_aliases_1 (callback, data, include_overwritable);
  return false;
}

/* Call callback on function and aliases associated to the function.
   When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
   skipped.  */

inline bool
cgraph_node::call_for_symbol_and_aliases (bool (*callback) (cgraph_node *,
							    void *),
					  void *data,
					  bool include_overwritable)
{
  if (callback (this, data))
    return true;
  if (has_aliases_p ())
    return call_for_symbol_and_aliases_1 (callback, data, include_overwritable);
  return false;
}

/* Call calback on varpool symbol and aliases associated to varpool symbol.
   When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
   skipped. */

inline bool
varpool_node::call_for_symbol_and_aliases (bool (*callback) (varpool_node *,
							     void *),
					   void *data,
					   bool include_overwritable)
{
  if (callback (this, data))
    return true;
  if (has_aliases_p ())
    return call_for_symbol_and_aliases_1 (callback, data, include_overwritable);
  return false;
}

/* Return true if refernece may be used in address compare.  */

inline bool
ipa_ref::address_matters_p ()
{
  if (use != IPA_REF_ADDR)
    return false;
  /* Addresses taken from virtual tables are never compared.  */
  if (is_a <varpool_node *> (referring)
      && DECL_VIRTUAL_P (referring->decl))
    return false;
  return referred->address_can_be_compared_p ();
}

/* Build polymorphic call context for indirect call E.  */

inline
ipa_polymorphic_call_context::ipa_polymorphic_call_context (cgraph_edge *e)
{
  gcc_checking_assert (e->indirect_info->polymorphic);
  *this = e->indirect_info->context;
}

/* Build empty "I know nothing" context.  */

inline
ipa_polymorphic_call_context::ipa_polymorphic_call_context ()
{
  clear_speculation ();
  clear_outer_type ();
  invalid = false;
}

/* Make context non-speculative.  */

inline void
ipa_polymorphic_call_context::clear_speculation ()
{
  speculative_outer_type = NULL;
  speculative_offset = 0;
  speculative_maybe_derived_type = false;
}

/* Produce context specifying all derrived types of OTR_TYPE.  If OTR_TYPE is
   NULL, the context is set to dummy "I know nothing" setting.  */

inline void
ipa_polymorphic_call_context::clear_outer_type (tree otr_type)
{
  outer_type = otr_type ? TYPE_MAIN_VARIANT (otr_type) : NULL;
  offset = 0;
  maybe_derived_type = true;
  maybe_in_construction = true;
  dynamic = true;
}

/* Adjust all offsets in contexts by OFF bits.  */

inline void
ipa_polymorphic_call_context::offset_by (HOST_WIDE_INT off)
{
  if (outer_type)
    offset += off;
  if (speculative_outer_type)
    speculative_offset += off;
}

/* Return TRUE if context is fully useless.  */

inline bool
ipa_polymorphic_call_context::useless_p () const
{
  return (!outer_type && !speculative_outer_type);
}

/* Return true if NODE is local.  Instrumentation clones are counted as local
   only when original function is local.  */

static inline bool
cgraph_local_p (cgraph_node *node)
{
  if (!node->instrumentation_clone || !node->instrumented_version)
    return node->local.local;

  return node->local.local && node->instrumented_version->local.local;
}

/* When using fprintf (or similar), problems can arise with
   transient generated strings.  Many string-generation APIs
   only support one result being alive at once (e.g. by
   returning a pointer to a statically-allocated buffer).

   If there is more than one generated string within one
   fprintf call: the first string gets evicted or overwritten
   by the second, before fprintf is fully evaluated.
   See e.g. PR/53136.

   This function provides a workaround for this, by providing
   a simple way to create copies of these transient strings,
   without the need to have explicit cleanup:

       fprintf (dumpfile, "string 1: %s string 2:%s\n",
                xstrdup_for_dump (EXPR_1),
                xstrdup_for_dump (EXPR_2));

   This is actually a simple wrapper around ggc_strdup, but
   the name documents the intent.  We require that no GC can occur
   within the fprintf call.  */

static inline const char *
xstrdup_for_dump (const char *transient_str)
{
  return ggc_strdup (transient_str);
}

#endif  /* GCC_CGRAPH_H  */