aboutsummaryrefslogtreecommitdiff
path: root/gold/symtab.cc
blob: daf9daf453a218a4921e650a393e194892624443 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
// symtab.cc -- the gold symbol table

// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.

// This file is part of gold.

// This program 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 of the License, or
// (at your option) any later version.

// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.

#include "gold.h"

#include <cstring>
#include <stdint.h>
#include <algorithm>
#include <set>
#include <string>
#include <utility>
#include "demangle.h"

#include "gc.h"
#include "object.h"
#include "dwarf_reader.h"
#include "dynobj.h"
#include "output.h"
#include "target.h"
#include "workqueue.h"
#include "symtab.h"
#include "demangle.h"   // needed for --dynamic-list-cpp-new
#include "plugin.h"

namespace gold
{

// Class Symbol.

// Initialize fields in Symbol.  This initializes everything except u_
// and source_.

void
Symbol::init_fields(const char* name, const char* version,
		    elfcpp::STT type, elfcpp::STB binding,
		    elfcpp::STV visibility, unsigned char nonvis)
{
  this->name_ = name;
  this->version_ = version;
  this->symtab_index_ = 0;
  this->dynsym_index_ = 0;
  this->got_offsets_.init();
  this->plt_offset_ = 0;
  this->type_ = type;
  this->binding_ = binding;
  this->visibility_ = visibility;
  this->nonvis_ = nonvis;
  this->is_target_special_ = false;
  this->is_def_ = false;
  this->is_forwarder_ = false;
  this->has_alias_ = false;
  this->needs_dynsym_entry_ = false;
  this->in_reg_ = false;
  this->in_dyn_ = false;
  this->has_plt_offset_ = false;
  this->has_warning_ = false;
  this->is_copied_from_dynobj_ = false;
  this->is_forced_local_ = false;
  this->is_ordinary_shndx_ = false;
  this->in_real_elf_ = false;
}

// Return the demangled version of the symbol's name, but only
// if the --demangle flag was set.

static std::string
demangle(const char* name)
{
  if (!parameters->options().do_demangle())
    return name;

  // cplus_demangle allocates memory for the result it returns,
  // and returns NULL if the name is already demangled.
  char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS);
  if (demangled_name == NULL)
    return name;

  std::string retval(demangled_name);
  free(demangled_name);
  return retval;
}

std::string
Symbol::demangled_name() const
{
  return demangle(this->name());
}

// Initialize the fields in the base class Symbol for SYM in OBJECT.

template<int size, bool big_endian>
void
Symbol::init_base_object(const char* name, const char* version, Object* object,
			 const elfcpp::Sym<size, big_endian>& sym,
			 unsigned int st_shndx, bool is_ordinary)
{
  this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(),
		    sym.get_st_visibility(), sym.get_st_nonvis());
  this->u_.from_object.object = object;
  this->u_.from_object.shndx = st_shndx;
  this->is_ordinary_shndx_ = is_ordinary;
  this->source_ = FROM_OBJECT;
  this->in_reg_ = !object->is_dynamic();
  this->in_dyn_ = object->is_dynamic();
  this->in_real_elf_ = object->pluginobj() == NULL;
}

// Initialize the fields in the base class Symbol for a symbol defined
// in an Output_data.

void
Symbol::init_base_output_data(const char* name, const char* version,
			      Output_data* od, elfcpp::STT type,
			      elfcpp::STB binding, elfcpp::STV visibility,
			      unsigned char nonvis, bool offset_is_from_end)
{
  this->init_fields(name, version, type, binding, visibility, nonvis);
  this->u_.in_output_data.output_data = od;
  this->u_.in_output_data.offset_is_from_end = offset_is_from_end;
  this->source_ = IN_OUTPUT_DATA;
  this->in_reg_ = true;
  this->in_real_elf_ = true;
}

// Initialize the fields in the base class Symbol for a symbol defined
// in an Output_segment.

void
Symbol::init_base_output_segment(const char* name, const char* version,
				 Output_segment* os, elfcpp::STT type,
				 elfcpp::STB binding, elfcpp::STV visibility,
				 unsigned char nonvis,
				 Segment_offset_base offset_base)
{
  this->init_fields(name, version, type, binding, visibility, nonvis);
  this->u_.in_output_segment.output_segment = os;
  this->u_.in_output_segment.offset_base = offset_base;
  this->source_ = IN_OUTPUT_SEGMENT;
  this->in_reg_ = true;
  this->in_real_elf_ = true;
}

// Initialize the fields in the base class Symbol for a symbol defined
// as a constant.

void
Symbol::init_base_constant(const char* name, const char* version,
			   elfcpp::STT type, elfcpp::STB binding,
			   elfcpp::STV visibility, unsigned char nonvis)
{
  this->init_fields(name, version, type, binding, visibility, nonvis);
  this->source_ = IS_CONSTANT;
  this->in_reg_ = true;
  this->in_real_elf_ = true;
}

// Initialize the fields in the base class Symbol for an undefined
// symbol.

void
Symbol::init_base_undefined(const char* name, const char* version,
			    elfcpp::STT type, elfcpp::STB binding,
			    elfcpp::STV visibility, unsigned char nonvis)
{
  this->init_fields(name, version, type, binding, visibility, nonvis);
  this->dynsym_index_ = -1U;
  this->source_ = IS_UNDEFINED;
  this->in_reg_ = true;
  this->in_real_elf_ = true;
}

// Allocate a common symbol in the base.

void
Symbol::allocate_base_common(Output_data* od)
{
  gold_assert(this->is_common());
  this->source_ = IN_OUTPUT_DATA;
  this->u_.in_output_data.output_data = od;
  this->u_.in_output_data.offset_is_from_end = false;
}

// Initialize the fields in Sized_symbol for SYM in OBJECT.

template<int size>
template<bool big_endian>
void
Sized_symbol<size>::init_object(const char* name, const char* version,
				Object* object,
				const elfcpp::Sym<size, big_endian>& sym,
				unsigned int st_shndx, bool is_ordinary)
{
  this->init_base_object(name, version, object, sym, st_shndx, is_ordinary);
  this->value_ = sym.get_st_value();
  this->symsize_ = sym.get_st_size();
}

// Initialize the fields in Sized_symbol for a symbol defined in an
// Output_data.

template<int size>
void
Sized_symbol<size>::init_output_data(const char* name, const char* version,
				     Output_data* od, Value_type value,
				     Size_type symsize, elfcpp::STT type,
				     elfcpp::STB binding,
				     elfcpp::STV visibility,
				     unsigned char nonvis,
				     bool offset_is_from_end)
{
  this->init_base_output_data(name, version, od, type, binding, visibility,
			      nonvis, offset_is_from_end);
  this->value_ = value;
  this->symsize_ = symsize;
}

// Initialize the fields in Sized_symbol for a symbol defined in an
// Output_segment.

template<int size>
void
Sized_symbol<size>::init_output_segment(const char* name, const char* version,
					Output_segment* os, Value_type value,
					Size_type symsize, elfcpp::STT type,
					elfcpp::STB binding,
					elfcpp::STV visibility,
					unsigned char nonvis,
					Segment_offset_base offset_base)
{
  this->init_base_output_segment(name, version, os, type, binding, visibility,
				 nonvis, offset_base);
  this->value_ = value;
  this->symsize_ = symsize;
}

// Initialize the fields in Sized_symbol for a symbol defined as a
// constant.

template<int size>
void
Sized_symbol<size>::init_constant(const char* name, const char* version,
				  Value_type value, Size_type symsize,
				  elfcpp::STT type, elfcpp::STB binding,
				  elfcpp::STV visibility, unsigned char nonvis)
{
  this->init_base_constant(name, version, type, binding, visibility, nonvis);
  this->value_ = value;
  this->symsize_ = symsize;
}

// Initialize the fields in Sized_symbol for an undefined symbol.

template<int size>
void
Sized_symbol<size>::init_undefined(const char* name, const char* version,
				   elfcpp::STT type, elfcpp::STB binding,
				   elfcpp::STV visibility, unsigned char nonvis)
{
  this->init_base_undefined(name, version, type, binding, visibility, nonvis);
  this->value_ = 0;
  this->symsize_ = 0;
}

// Return true if SHNDX represents a common symbol.

bool
Symbol::is_common_shndx(unsigned int shndx)
{
  return (shndx == elfcpp::SHN_COMMON
	  || shndx == parameters->target().small_common_shndx()
	  || shndx == parameters->target().large_common_shndx());
}

// Allocate a common symbol.

template<int size>
void
Sized_symbol<size>::allocate_common(Output_data* od, Value_type value)
{
  this->allocate_base_common(od);
  this->value_ = value;
}

// The ""'s around str ensure str is a string literal, so sizeof works.
#define strprefix(var, str)   (strncmp(var, str, sizeof("" str "") - 1) == 0)

// Return true if this symbol should be added to the dynamic symbol
// table.

inline bool
Symbol::should_add_dynsym_entry() const
{
  // If the symbol is used by a dynamic relocation, we need to add it.
  if (this->needs_dynsym_entry())
    return true;

  // If this symbol's section is not added, the symbol need not be added. 
  // The section may have been GCed.  Note that export_dynamic is being 
  // overridden here.  This should not be done for shared objects.
  if (parameters->options().gc_sections() 
      && !parameters->options().shared()
      && this->source() == Symbol::FROM_OBJECT
      && !this->object()->is_dynamic())
    {
      Relobj* relobj = static_cast<Relobj*>(this->object());
      bool is_ordinary;
      unsigned int shndx = this->shndx(&is_ordinary);
      if (is_ordinary && shndx != elfcpp::SHN_UNDEF
          && !relobj->is_section_included(shndx))
        return false;
    }

  // If the symbol was forced local in a version script, do not add it.
  if (this->is_forced_local())
    return false;

  // If the symbol was forced dynamic in a --dynamic-list file, add it.
  if (parameters->options().in_dynamic_list(this->name()))
    return true;

  // If dynamic-list-data was specified, add any STT_OBJECT.
  if (parameters->options().dynamic_list_data()
      && !this->is_from_dynobj()
      && this->type() == elfcpp::STT_OBJECT)
    return true;

  // If --dynamic-list-cpp-new was specified, add any new/delete symbol.
  // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols.
  if ((parameters->options().dynamic_list_cpp_new()
       || parameters->options().dynamic_list_cpp_typeinfo())
      && !this->is_from_dynobj())
    {
      // TODO(csilvers): We could probably figure out if we're an operator
      //                 new/delete or typeinfo without the need to demangle.
      char* demangled_name = cplus_demangle(this->name(),
                                            DMGL_ANSI | DMGL_PARAMS);
      if (demangled_name == NULL)
        {
          // Not a C++ symbol, so it can't satisfy these flags
        }
      else if (parameters->options().dynamic_list_cpp_new()
               && (strprefix(demangled_name, "operator new")
                   || strprefix(demangled_name, "operator delete")))
        {
          free(demangled_name);
          return true;
        }
      else if (parameters->options().dynamic_list_cpp_typeinfo()
               && (strprefix(demangled_name, "typeinfo name for")
                   || strprefix(demangled_name, "typeinfo for")))
        {
          free(demangled_name);
          return true;
        }
      else
        free(demangled_name);
    }

  // If exporting all symbols or building a shared library,
  // and the symbol is defined in a regular object and is
  // externally visible, we need to add it.
  if ((parameters->options().export_dynamic() || parameters->options().shared())
      && !this->is_from_dynobj()
      && this->is_externally_visible())
    return true;

  return false;
}

// Return true if the final value of this symbol is known at link
// time.

bool
Symbol::final_value_is_known() const
{
  // If we are not generating an executable, then no final values are
  // known, since they will change at runtime.
  if (parameters->options().shared() || parameters->options().relocatable())
    return false;

  // If the symbol is not from an object file, and is not undefined,
  // then it is defined, and known.
  if (this->source_ != FROM_OBJECT)
    {
      if (this->source_ != IS_UNDEFINED)
	return true;
    }
  else
    {
      // If the symbol is from a dynamic object, then the final value
      // is not known.
      if (this->object()->is_dynamic())
	return false;

      // If the symbol is not undefined (it is defined or common),
      // then the final value is known.
      if (!this->is_undefined())
	return true;
    }

  // If the symbol is undefined, then whether the final value is known
  // depends on whether we are doing a static link.  If we are doing a
  // dynamic link, then the final value could be filled in at runtime.
  // This could reasonably be the case for a weak undefined symbol.
  return parameters->doing_static_link();
}

// Return the output section where this symbol is defined.

Output_section*
Symbol::output_section() const
{
  switch (this->source_)
    {
    case FROM_OBJECT:
      {
	unsigned int shndx = this->u_.from_object.shndx;
	if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_)
	  {
	    gold_assert(!this->u_.from_object.object->is_dynamic());
	    gold_assert(this->u_.from_object.object->pluginobj() == NULL);
	    Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object);
	    return relobj->output_section(shndx);
	  }
	return NULL;
      }

    case IN_OUTPUT_DATA:
      return this->u_.in_output_data.output_data->output_section();

    case IN_OUTPUT_SEGMENT:
    case IS_CONSTANT:
    case IS_UNDEFINED:
      return NULL;

    default:
      gold_unreachable();
    }
}

// Set the symbol's output section.  This is used for symbols defined
// in scripts.  This should only be called after the symbol table has
// been finalized.

void
Symbol::set_output_section(Output_section* os)
{
  switch (this->source_)
    {
    case FROM_OBJECT:
    case IN_OUTPUT_DATA:
      gold_assert(this->output_section() == os);
      break;
    case IS_CONSTANT:
      this->source_ = IN_OUTPUT_DATA;
      this->u_.in_output_data.output_data = os;
      this->u_.in_output_data.offset_is_from_end = false;
      break;
    case IN_OUTPUT_SEGMENT:
    case IS_UNDEFINED:
    default:
      gold_unreachable();
    }
}

// Class Symbol_table.

Symbol_table::Symbol_table(unsigned int count,
                           const Version_script_info& version_script)
  : saw_undefined_(0), offset_(0), table_(count), namepool_(),
    forwarders_(), commons_(), tls_commons_(), small_commons_(),
    large_commons_(), forced_locals_(), warnings_(),
    version_script_(version_script), gc_(NULL)
{
  namepool_.reserve(count);
}

Symbol_table::~Symbol_table()
{
}

// The hash function.  The key values are Stringpool keys.

inline size_t
Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const
{
  return key.first ^ key.second;
}

// The symbol table key equality function.  This is called with
// Stringpool keys.

inline bool
Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1,
					  const Symbol_table_key& k2) const
{
  return k1.first == k2.first && k1.second == k2.second;
}

// For symbols that have been listed with -u option, add them to the
// work list to avoid gc'ing them.

void 
Symbol_table::gc_mark_undef_symbols()
{
  for (options::String_set::const_iterator p =
	 parameters->options().undefined_begin();
       p != parameters->options().undefined_end();
       ++p)
    {
      const char* name = p->c_str();
      Symbol* sym = this->lookup(name);
      gold_assert (sym != NULL);
      if (sym->source() == Symbol::FROM_OBJECT 
          && !sym->object()->is_dynamic())
        {
          Relobj* obj = static_cast<Relobj*>(sym->object());
          bool is_ordinary;
          unsigned int shndx = sym->shndx(&is_ordinary);
          if (is_ordinary)
            {
              gold_assert(this->gc_ != NULL);
              this->gc_->worklist().push(Section_id(obj, shndx));
            }
        }
    }
}

void
Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym)
{
  if (!sym->is_from_dynobj() 
      && sym->is_externally_visible())
    {
      //Add the object and section to the work list.
      Relobj* obj = static_cast<Relobj*>(sym->object());
      bool is_ordinary;
      unsigned int shndx = sym->shndx(&is_ordinary);
      if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
        {
          gold_assert(this->gc_!= NULL);
          this->gc_->worklist().push(Section_id(obj, shndx));
        }
    }
}

// When doing garbage collection, keep symbols that have been seen in
// dynamic objects.
inline void 
Symbol_table::gc_mark_dyn_syms(Symbol* sym)
{
  if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT
      && !sym->object()->is_dynamic())
    {
      Relobj *obj = static_cast<Relobj*>(sym->object()); 
      bool is_ordinary;
      unsigned int shndx = sym->shndx(&is_ordinary);
      if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
        {
          gold_assert(this->gc_ != NULL);
          this->gc_->worklist().push(Section_id(obj, shndx));
        }
    }
}

// Make TO a symbol which forwards to FROM.

void
Symbol_table::make_forwarder(Symbol* from, Symbol* to)
{
  gold_assert(from != to);
  gold_assert(!from->is_forwarder() && !to->is_forwarder());
  this->forwarders_[from] = to;
  from->set_forwarder();
}

// Resolve the forwards from FROM, returning the real symbol.

Symbol*
Symbol_table::resolve_forwards(const Symbol* from) const
{
  gold_assert(from->is_forwarder());
  Unordered_map<const Symbol*, Symbol*>::const_iterator p =
    this->forwarders_.find(from);
  gold_assert(p != this->forwarders_.end());
  return p->second;
}

// Look up a symbol by name.

Symbol*
Symbol_table::lookup(const char* name, const char* version) const
{
  Stringpool::Key name_key;
  name = this->namepool_.find(name, &name_key);
  if (name == NULL)
    return NULL;

  Stringpool::Key version_key = 0;
  if (version != NULL)
    {
      version = this->namepool_.find(version, &version_key);
      if (version == NULL)
	return NULL;
    }

  Symbol_table_key key(name_key, version_key);
  Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key);
  if (p == this->table_.end())
    return NULL;
  return p->second;
}

// Resolve a Symbol with another Symbol.  This is only used in the
// unusual case where there are references to both an unversioned
// symbol and a symbol with a version, and we then discover that that
// version is the default version.  Because this is unusual, we do
// this the slow way, by converting back to an ELF symbol.

template<int size, bool big_endian>
void
Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
{
  unsigned char buf[elfcpp::Elf_sizes<size>::sym_size];
  elfcpp::Sym_write<size, big_endian> esym(buf);
  // We don't bother to set the st_name or the st_shndx field.
  esym.put_st_value(from->value());
  esym.put_st_size(from->symsize());
  esym.put_st_info(from->binding(), from->type());
  esym.put_st_other(from->visibility(), from->nonvis());
  bool is_ordinary;
  unsigned int shndx = from->shndx(&is_ordinary);
  this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(),
		from->version());
  if (from->in_reg())
    to->set_in_reg();
  if (from->in_dyn())
    to->set_in_dyn();
  if (parameters->options().gc_sections())
    this->gc_mark_dyn_syms(to);
}

// Record that a symbol is forced to be local by a version script or
// by visibility.

void
Symbol_table::force_local(Symbol* sym)
{
  if (!sym->is_defined() && !sym->is_common())
    return;
  if (sym->is_forced_local())
    {
      // We already got this one.
      return;
    }
  sym->set_is_forced_local();
  this->forced_locals_.push_back(sym);
}

// Adjust NAME for wrapping, and update *NAME_KEY if necessary.  This
// is only called for undefined symbols, when at least one --wrap
// option was used.

const char*
Symbol_table::wrap_symbol(Object* object, const char* name,
			  Stringpool::Key* name_key)
{
  // For some targets, we need to ignore a specific character when
  // wrapping, and add it back later.
  char prefix = '\0';
  if (name[0] == object->target()->wrap_char())
    {
      prefix = name[0];
      ++name;
    }

  if (parameters->options().is_wrap(name))
    {
      // Turn NAME into __wrap_NAME.
      std::string s;
      if (prefix != '\0')
	s += prefix;
      s += "__wrap_";
      s += name;

      // This will give us both the old and new name in NAMEPOOL_, but
      // that is OK.  Only the versions we need will wind up in the
      // real string table in the output file.
      return this->namepool_.add(s.c_str(), true, name_key);
    }

  const char* const real_prefix = "__real_";
  const size_t real_prefix_length = strlen(real_prefix);
  if (strncmp(name, real_prefix, real_prefix_length) == 0
      && parameters->options().is_wrap(name + real_prefix_length))
    {
      // Turn __real_NAME into NAME.
      std::string s;
      if (prefix != '\0')
	s += prefix;
      s += name + real_prefix_length;
      return this->namepool_.add(s.c_str(), true, name_key);
    }

  return name;
}

// This is called when we see a symbol NAME/VERSION, and the symbol
// already exists in the symbol table, and VERSION is marked as being
// the default version.  SYM is the NAME/VERSION symbol we just added.
// DEFAULT_IS_NEW is true if this is the first time we have seen the
// symbol NAME/NULL.  PDEF points to the entry for NAME/NULL.

template<int size, bool big_endian>
void
Symbol_table::define_default_version(Sized_symbol<size>* sym,
				     bool default_is_new,
				     Symbol_table_type::iterator pdef)
{
  if (default_is_new)
    {
      // This is the first time we have seen NAME/NULL.  Make
      // NAME/NULL point to NAME/VERSION, and mark SYM as the default
      // version.
      pdef->second = sym;
      sym->set_is_default();
    }
  else if (pdef->second == sym)
    {
      // NAME/NULL already points to NAME/VERSION.  Don't mark the
      // symbol as the default if it is not already the default.
    }
  else
    {
      // This is the unfortunate case where we already have entries
      // for both NAME/VERSION and NAME/NULL.  We now see a symbol
      // NAME/VERSION where VERSION is the default version.  We have
      // already resolved this new symbol with the existing
      // NAME/VERSION symbol.

      // It's possible that NAME/NULL and NAME/VERSION are both
      // defined in regular objects.  This can only happen if one
      // object file defines foo and another defines foo@@ver.  This
      // is somewhat obscure, but we call it a multiple definition
      // error.

      // It's possible that NAME/NULL actually has a version, in which
      // case it won't be the same as VERSION.  This happens with
      // ver_test_7.so in the testsuite for the symbol t2_2.  We see
      // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL.  We
      // then see an unadorned t2_2 in an object file and give it
      // version VER1 from the version script.  This looks like a
      // default definition for VER1, so it looks like we should merge
      // t2_2/NULL with t2_2/VER1.  That doesn't make sense, but it's
      // not obvious that this is an error, either.  So we just punt.

      // If one of the symbols has non-default visibility, and the
      // other is defined in a shared object, then they are different
      // symbols.

      // Otherwise, we just resolve the symbols as though they were
      // the same.

      if (pdef->second->version() != NULL)
	gold_assert(pdef->second->version() != sym->version());
      else if (sym->visibility() != elfcpp::STV_DEFAULT
	       && pdef->second->is_from_dynobj())
	;
      else if (pdef->second->visibility() != elfcpp::STV_DEFAULT
	       && sym->is_from_dynobj())
	;
      else
	{
	  const Sized_symbol<size>* symdef;
	  symdef = this->get_sized_symbol<size>(pdef->second);
	  Symbol_table::resolve<size, big_endian>(sym, symdef);
	  this->make_forwarder(pdef->second, sym);
	  pdef->second = sym;
	  sym->set_is_default();
	}
    }
}

// Add one symbol from OBJECT to the symbol table.  NAME is symbol
// name and VERSION is the version; both are canonicalized.  DEF is
// whether this is the default version.  ST_SHNDX is the symbol's
// section index; IS_ORDINARY is whether this is a normal section
// rather than a special code.

// If DEF is true, then this is the definition of a default version of
// a symbol.  That means that any lookup of NAME/NULL and any lookup
// of NAME/VERSION should always return the same symbol.  This is
// obvious for references, but in particular we want to do this for
// definitions: overriding NAME/NULL should also override
// NAME/VERSION.  If we don't do that, it would be very hard to
// override functions in a shared library which uses versioning.

// We implement this by simply making both entries in the hash table
// point to the same Symbol structure.  That is easy enough if this is
// the first time we see NAME/NULL or NAME/VERSION, but it is possible
// that we have seen both already, in which case they will both have
// independent entries in the symbol table.  We can't simply change
// the symbol table entry, because we have pointers to the entries
// attached to the object files.  So we mark the entry attached to the
// object file as a forwarder, and record it in the forwarders_ map.
// Note that entries in the hash table will never be marked as
// forwarders.
//
// ORIG_ST_SHNDX and ST_SHNDX are almost always the same.
// ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF
// for a special section code.  ST_SHNDX may be modified if the symbol
// is defined in a section being discarded.

template<int size, bool big_endian>
Sized_symbol<size>*
Symbol_table::add_from_object(Object* object,
			      const char *name,
			      Stringpool::Key name_key,
			      const char *version,
			      Stringpool::Key version_key,
			      bool def,
			      const elfcpp::Sym<size, big_endian>& sym,
			      unsigned int st_shndx,
			      bool is_ordinary,
			      unsigned int orig_st_shndx)
{
  // Print a message if this symbol is being traced.
  if (parameters->options().is_trace_symbol(name))
    {
      if (orig_st_shndx == elfcpp::SHN_UNDEF)
        gold_info(_("%s: reference to %s"), object->name().c_str(), name);
      else
        gold_info(_("%s: definition of %s"), object->name().c_str(), name);
    }

  // For an undefined symbol, we may need to adjust the name using
  // --wrap.
  if (orig_st_shndx == elfcpp::SHN_UNDEF
      && parameters->options().any_wrap())
    {
      const char* wrap_name = this->wrap_symbol(object, name, &name_key);
      if (wrap_name != name)
	{
	  // If we see a reference to malloc with version GLIBC_2.0,
	  // and we turn it into a reference to __wrap_malloc, then we
	  // discard the version number.  Otherwise the user would be
	  // required to specify the correct version for
	  // __wrap_malloc.
	  version = NULL;
	  version_key = 0;
	  name = wrap_name;
	}
    }

  Symbol* const snull = NULL;
  std::pair<typename Symbol_table_type::iterator, bool> ins =
    this->table_.insert(std::make_pair(std::make_pair(name_key, version_key),
				       snull));

  std::pair<typename Symbol_table_type::iterator, bool> insdef =
    std::make_pair(this->table_.end(), false);
  if (def)
    {
      const Stringpool::Key vnull_key = 0;
      insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
								 vnull_key),
						  snull));
    }

  // ins.first: an iterator, which is a pointer to a pair.
  // ins.first->first: the key (a pair of name and version).
  // ins.first->second: the value (Symbol*).
  // ins.second: true if new entry was inserted, false if not.

  Sized_symbol<size>* ret;
  bool was_undefined;
  bool was_common;
  if (!ins.second)
    {
      // We already have an entry for NAME/VERSION.
      ret = this->get_sized_symbol<size>(ins.first->second);
      gold_assert(ret != NULL);

      was_undefined = ret->is_undefined();
      was_common = ret->is_common();

      this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
		    version);
      if (parameters->options().gc_sections())
        this->gc_mark_dyn_syms(ret);

      if (def)
	this->define_default_version<size, big_endian>(ret, insdef.second,
						       insdef.first);
    }
  else
    {
      // This is the first time we have seen NAME/VERSION.
      gold_assert(ins.first->second == NULL);

      if (def && !insdef.second)
	{
	  // We already have an entry for NAME/NULL.  If we override
	  // it, then change it to NAME/VERSION.
	  ret = this->get_sized_symbol<size>(insdef.first->second);

	  was_undefined = ret->is_undefined();
	  was_common = ret->is_common();

	  this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
			version);
          if (parameters->options().gc_sections())
            this->gc_mark_dyn_syms(ret);
	  ins.first->second = ret;
	}
      else
	{
	  was_undefined = false;
	  was_common = false;

	  Sized_target<size, big_endian>* target =
	    object->sized_target<size, big_endian>();
	  if (!target->has_make_symbol())
	    ret = new Sized_symbol<size>();
	  else
	    {
	      ret = target->make_symbol();
	      if (ret == NULL)
		{
		  // This means that we don't want a symbol table
		  // entry after all.
		  if (!def)
		    this->table_.erase(ins.first);
		  else
		    {
		      this->table_.erase(insdef.first);
		      // Inserting insdef invalidated ins.
		      this->table_.erase(std::make_pair(name_key,
							version_key));
		    }
		  return NULL;
		}
	    }

	  ret->init_object(name, version, object, sym, st_shndx, is_ordinary);

	  ins.first->second = ret;
	  if (def)
	    {
	      // This is the first time we have seen NAME/NULL.  Point
	      // it at the new entry for NAME/VERSION.
	      gold_assert(insdef.second);
	      insdef.first->second = ret;
	    }
	}

      if (def)
	ret->set_is_default();
    }

  // Record every time we see a new undefined symbol, to speed up
  // archive groups.
  if (!was_undefined && ret->is_undefined())
    ++this->saw_undefined_;

  // Keep track of common symbols, to speed up common symbol
  // allocation.
  if (!was_common && ret->is_common())
    {
      if (ret->type() == elfcpp::STT_TLS)
	this->tls_commons_.push_back(ret);
      else if (!is_ordinary
	       && st_shndx == parameters->target().small_common_shndx())
	this->small_commons_.push_back(ret);
      else if (!is_ordinary
	       && st_shndx == parameters->target().large_common_shndx())
	this->large_commons_.push_back(ret);
      else
	this->commons_.push_back(ret);
    }

  // If we're not doing a relocatable link, then any symbol with
  // hidden or internal visibility is local.
  if ((ret->visibility() == elfcpp::STV_HIDDEN
       || ret->visibility() == elfcpp::STV_INTERNAL)
      && (ret->binding() == elfcpp::STB_GLOBAL
	  || ret->binding() == elfcpp::STB_WEAK)
      && !parameters->options().relocatable())
    this->force_local(ret);

  return ret;
}

// Add all the symbols in a relocatable object to the hash table.

template<int size, bool big_endian>
void
Symbol_table::add_from_relobj(
    Sized_relobj<size, big_endian>* relobj,
    const unsigned char* syms,
    size_t count,
    size_t symndx_offset,
    const char* sym_names,
    size_t sym_name_size,
    typename Sized_relobj<size, big_endian>::Symbols* sympointers,
    size_t *defined)
{
  *defined = 0;

  gold_assert(size == relobj->target()->get_size());
  gold_assert(size == parameters->target().get_size());

  const int sym_size = elfcpp::Elf_sizes<size>::sym_size;

  const bool just_symbols = relobj->just_symbols();

  const unsigned char* p = syms;
  for (size_t i = 0; i < count; ++i, p += sym_size)
    {
      (*sympointers)[i] = NULL;

      elfcpp::Sym<size, big_endian> sym(p);

      unsigned int st_name = sym.get_st_name();
      if (st_name >= sym_name_size)
	{
	  relobj->error(_("bad global symbol name offset %u at %zu"),
			st_name, i);
	  continue;
	}

      const char* name = sym_names + st_name;

      bool is_ordinary;
      unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset,
						       sym.get_st_shndx(),
						       &is_ordinary);
      unsigned int orig_st_shndx = st_shndx;
      if (!is_ordinary)
	orig_st_shndx = elfcpp::SHN_UNDEF;

      if (st_shndx != elfcpp::SHN_UNDEF)
	++*defined;

      // A symbol defined in a section which we are not including must
      // be treated as an undefined symbol.
      if (st_shndx != elfcpp::SHN_UNDEF
	  && is_ordinary
	  && !relobj->is_section_included(st_shndx))
	st_shndx = elfcpp::SHN_UNDEF;

      // In an object file, an '@' in the name separates the symbol
      // name from the version name.  If there are two '@' characters,
      // this is the default version.
      const char* ver = strchr(name, '@');
      Stringpool::Key ver_key = 0;
      int namelen = 0;
      // DEF: is the version default?  LOCAL: is the symbol forced local?
      bool def = false;
      bool local = false;

      if (ver != NULL)
        {
          // The symbol name is of the form foo@VERSION or foo@@VERSION
          namelen = ver - name;
          ++ver;
	  if (*ver == '@')
	    {
	      def = true;
	      ++ver;
	    }
	  ver = this->namepool_.add(ver, true, &ver_key);
        }
      // We don't want to assign a version to an undefined symbol,
      // even if it is listed in the version script.  FIXME: What
      // about a common symbol?
      else
	{
	  namelen = strlen(name);
	  if (!this->version_script_.empty()
	      && st_shndx != elfcpp::SHN_UNDEF)
	    {
	      // The symbol name did not have a version, but the
	      // version script may assign a version anyway.
	      std::string version;
	      if (this->version_script_.get_symbol_version(name, &version))
		{
		  // The version can be empty if the version script is
		  // only used to force some symbols to be local.
		  if (!version.empty())
		    {
		      ver = this->namepool_.add_with_length(version.c_str(),
							    version.length(),
							    true,
							    &ver_key);
		      def = true;
		    }
		}
	      else if (this->version_script_.symbol_is_local(name))
		local = true;
	    }
	}

      elfcpp::Sym<size, big_endian>* psym = &sym;
      unsigned char symbuf[sym_size];
      elfcpp::Sym<size, big_endian> sym2(symbuf);
      if (just_symbols)
	{
	  memcpy(symbuf, p, sym_size);
	  elfcpp::Sym_write<size, big_endian> sw(symbuf);
	  if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary)
	    {
	      // Symbol values in object files are section relative.
	      // This is normally what we want, but since here we are
	      // converting the symbol to absolute we need to add the
	      // section address.  The section address in an object
	      // file is normally zero, but people can use a linker
	      // script to change it.
	      sw.put_st_value(sym.get_st_value()
			      + relobj->section_address(orig_st_shndx));
	    }
	  st_shndx = elfcpp::SHN_ABS;
	  is_ordinary = false;
	  psym = &sym2;
	}

      // Fix up visibility if object has no-export set.
      if (relobj->no_export())
        {
	  // We may have copied symbol already above.
	  if (psym != &sym2)
	    {
	      memcpy(symbuf, p, sym_size);
	      psym = &sym2;
	    }

	  elfcpp::STV visibility = sym2.get_st_visibility();
	  if (visibility == elfcpp::STV_DEFAULT
	      || visibility == elfcpp::STV_PROTECTED)
	    {
	      elfcpp::Sym_write<size, big_endian> sw(symbuf);
	      unsigned char nonvis = sym2.get_st_nonvis();
	      sw.put_st_other(elfcpp::STV_HIDDEN, nonvis);
	    }
        }

      Stringpool::Key name_key;
      name = this->namepool_.add_with_length(name, namelen, true,
					     &name_key);

      Sized_symbol<size>* res;
      res = this->add_from_object(relobj, name, name_key, ver, ver_key,
				  def, *psym, st_shndx, is_ordinary,
				  orig_st_shndx);
      
      // If building a shared library using garbage collection, do not 
      // treat externally visible symbols as garbage.
      if (parameters->options().gc_sections() 
          && parameters->options().shared())
        this->gc_mark_symbol_for_shlib(res);

      if (local)
	this->force_local(res);

      (*sympointers)[i] = res;
    }
}

// Add a symbol from a plugin-claimed file.

template<int size, bool big_endian>
Symbol*
Symbol_table::add_from_pluginobj(
    Sized_pluginobj<size, big_endian>* obj,
    const char* name,
    const char* ver,
    elfcpp::Sym<size, big_endian>* sym)
{
  unsigned int st_shndx = sym->get_st_shndx();

  Stringpool::Key ver_key = 0;
  bool def = false;
  bool local = false;

  if (ver != NULL)
    {
      ver = this->namepool_.add(ver, true, &ver_key);
    }
  // We don't want to assign a version to an undefined symbol,
  // even if it is listed in the version script.  FIXME: What
  // about a common symbol?
  else
    {
      if (!this->version_script_.empty()
          && st_shndx != elfcpp::SHN_UNDEF)
        {
          // The symbol name did not have a version, but the
          // version script may assign a version anyway.
          std::string version;
          if (this->version_script_.get_symbol_version(name, &version))
            {
              // The version can be empty if the version script is
              // only used to force some symbols to be local.
              if (!version.empty())
                {
                  ver = this->namepool_.add_with_length(version.c_str(),
                                                        version.length(),
                                                        true,
                                                        &ver_key);
                  def = true;
                }
            }
          else if (this->version_script_.symbol_is_local(name))
            local = true;
        }
    }

  Stringpool::Key name_key;
  name = this->namepool_.add(name, true, &name_key);

  Sized_symbol<size>* res;
  res = this->add_from_object(obj, name, name_key, ver, ver_key,
		              def, *sym, st_shndx, true, st_shndx);

  if (local)
    this->force_local(res);

  return res;
}

// Add all the symbols in a dynamic object to the hash table.

template<int size, bool big_endian>
void
Symbol_table::add_from_dynobj(
    Sized_dynobj<size, big_endian>* dynobj,
    const unsigned char* syms,
    size_t count,
    const char* sym_names,
    size_t sym_name_size,
    const unsigned char* versym,
    size_t versym_size,
    const std::vector<const char*>* version_map,
    typename Sized_relobj<size, big_endian>::Symbols* sympointers,
    size_t* defined)
{
  *defined = 0;

  gold_assert(size == dynobj->target()->get_size());
  gold_assert(size == parameters->target().get_size());

  if (dynobj->just_symbols())
    {
      gold_error(_("--just-symbols does not make sense with a shared object"));
      return;
    }

  if (versym != NULL && versym_size / 2 < count)
    {
      dynobj->error(_("too few symbol versions"));
      return;
    }

  const int sym_size = elfcpp::Elf_sizes<size>::sym_size;

  // We keep a list of all STT_OBJECT symbols, so that we can resolve
  // weak aliases.  This is necessary because if the dynamic object
  // provides the same variable under two names, one of which is a
  // weak definition, and the regular object refers to the weak
  // definition, we have to put both the weak definition and the
  // strong definition into the dynamic symbol table.  Given a weak
  // definition, the only way that we can find the corresponding
  // strong definition, if any, is to search the symbol table.
  std::vector<Sized_symbol<size>*> object_symbols;

  const unsigned char* p = syms;
  const unsigned char* vs = versym;
  for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2)
    {
      elfcpp::Sym<size, big_endian> sym(p);

      if (sympointers != NULL)
	(*sympointers)[i] = NULL;

      // Ignore symbols with local binding or that have
      // internal or hidden visibility.
      if (sym.get_st_bind() == elfcpp::STB_LOCAL
          || sym.get_st_visibility() == elfcpp::STV_INTERNAL
          || sym.get_st_visibility() == elfcpp::STV_HIDDEN)
	continue;

      // A protected symbol in a shared library must be treated as a
      // normal symbol when viewed from outside the shared library.
      // Implement this by overriding the visibility here.
      elfcpp::Sym<size, big_endian>* psym = &sym;
      unsigned char symbuf[sym_size];
      elfcpp::Sym<size, big_endian> sym2(symbuf);
      if (sym.get_st_visibility() == elfcpp::STV_PROTECTED)
	{
	  memcpy(symbuf, p, sym_size);
	  elfcpp::Sym_write<size, big_endian> sw(symbuf);
	  sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis());
	  psym = &sym2;
	}

      unsigned int st_name = psym->get_st_name();
      if (st_name >= sym_name_size)
	{
	  dynobj->error(_("bad symbol name offset %u at %zu"),
			st_name, i);
	  continue;
	}

      const char* name = sym_names + st_name;

      bool is_ordinary;
      unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(),
						       &is_ordinary);

      if (st_shndx != elfcpp::SHN_UNDEF)
	++*defined;

      Sized_symbol<size>* res;

      if (versym == NULL)
	{
	  Stringpool::Key name_key;
	  name = this->namepool_.add(name, true, &name_key);
	  res = this->add_from_object(dynobj, name, name_key, NULL, 0,
				      false, *psym, st_shndx, is_ordinary,
				      st_shndx);
	}
      else
	{
	  // Read the version information.

	  unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs);

	  bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0;
	  v &= elfcpp::VERSYM_VERSION;

	  // The Sun documentation says that V can be VER_NDX_LOCAL,
	  // or VER_NDX_GLOBAL, or a version index.  The meaning of
	  // VER_NDX_LOCAL is defined as "Symbol has local scope."
	  // The old GNU linker will happily generate VER_NDX_LOCAL
	  // for an undefined symbol.  I don't know what the Sun
	  // linker will generate.

	  if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
	      && st_shndx != elfcpp::SHN_UNDEF)
	    {
	      // This symbol should not be visible outside the object.
	      continue;
	    }

	  // At this point we are definitely going to add this symbol.
	  Stringpool::Key name_key;
	  name = this->namepool_.add(name, true, &name_key);

	  if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL)
	      || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL))
	    {
	      // This symbol does not have a version.
	      res = this->add_from_object(dynobj, name, name_key, NULL, 0,
					  false, *psym, st_shndx, is_ordinary,
					  st_shndx);
	    }
	  else
	    {
	      if (v >= version_map->size())
		{
		  dynobj->error(_("versym for symbol %zu out of range: %u"),
				i, v);
		  continue;
		}

	      const char* version = (*version_map)[v];
	      if (version == NULL)
		{
		  dynobj->error(_("versym for symbol %zu has no name: %u"),
				i, v);
		  continue;
		}

	      Stringpool::Key version_key;
	      version = this->namepool_.add(version, true, &version_key);

	      // If this is an absolute symbol, and the version name
	      // and symbol name are the same, then this is the
	      // version definition symbol.  These symbols exist to
	      // support using -u to pull in particular versions.  We
	      // do not want to record a version for them.
	      if (st_shndx == elfcpp::SHN_ABS
		  && !is_ordinary
		  && name_key == version_key)
		res = this->add_from_object(dynobj, name, name_key, NULL, 0,
					    false, *psym, st_shndx, is_ordinary,
					    st_shndx);
	      else
		{
		  const bool def = (!hidden
				    && st_shndx != elfcpp::SHN_UNDEF);
		  res = this->add_from_object(dynobj, name, name_key, version,
					      version_key, def, *psym, st_shndx,
					      is_ordinary, st_shndx);
		}
	    }
	}

      // Note that it is possible that RES was overridden by an
      // earlier object, in which case it can't be aliased here.
      if (st_shndx != elfcpp::SHN_UNDEF
	  && is_ordinary
	  && psym->get_st_type() == elfcpp::STT_OBJECT
	  && res->source() == Symbol::FROM_OBJECT
	  && res->object() == dynobj)
	object_symbols.push_back(res);

      if (sympointers != NULL)
	(*sympointers)[i] = res;
    }

  this->record_weak_aliases(&object_symbols);
}

// This is used to sort weak aliases.  We sort them first by section
// index, then by offset, then by weak ahead of strong.

template<int size>
class Weak_alias_sorter
{
 public:
  bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const;
};

template<int size>
bool
Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1,
				    const Sized_symbol<size>* s2) const
{
  bool is_ordinary;
  unsigned int s1_shndx = s1->shndx(&is_ordinary);
  gold_assert(is_ordinary);
  unsigned int s2_shndx = s2->shndx(&is_ordinary);
  gold_assert(is_ordinary);
  if (s1_shndx != s2_shndx)
    return s1_shndx < s2_shndx;

  if (s1->value() != s2->value())
    return s1->value() < s2->value();
  if (s1->binding() != s2->binding())
    {
      if (s1->binding() == elfcpp::STB_WEAK)
	return true;
      if (s2->binding() == elfcpp::STB_WEAK)
	return false;
    }
  return std::string(s1->name()) < std::string(s2->name());
}

// SYMBOLS is a list of object symbols from a dynamic object.  Look
// for any weak aliases, and record them so that if we add the weak
// alias to the dynamic symbol table, we also add the corresponding
// strong symbol.

template<int size>
void
Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols)
{
  // Sort the vector by section index, then by offset, then by weak
  // ahead of strong.
  std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>());

  // Walk through the vector.  For each weak definition, record
  // aliases.
  for (typename std::vector<Sized_symbol<size>*>::const_iterator p =
	 symbols->begin();
       p != symbols->end();
       ++p)
    {
      if ((*p)->binding() != elfcpp::STB_WEAK)
	continue;

      // Build a circular list of weak aliases.  Each symbol points to
      // the next one in the circular list.

      Sized_symbol<size>* from_sym = *p;
      typename std::vector<Sized_symbol<size>*>::const_iterator q;
      for (q = p + 1; q != symbols->end(); ++q)
	{
	  bool dummy;
	  if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy)
	      || (*q)->value() != from_sym->value())
	    break;

	  this->weak_aliases_[from_sym] = *q;
	  from_sym->set_has_alias();
	  from_sym = *q;
	}

      if (from_sym != *p)
	{
	  this->weak_aliases_[from_sym] = *p;
	  from_sym->set_has_alias();
	}

      p = q - 1;
    }
}

// Create and return a specially defined symbol.  If ONLY_IF_REF is
// true, then only create the symbol if there is a reference to it.
// If this does not return NULL, it sets *POLDSYM to the existing
// symbol if there is one.  This sets *RESOLVE_OLDSYM if we should
// resolve the newly created symbol to the old one.  This
// canonicalizes *PNAME and *PVERSION.

template<int size, bool big_endian>
Sized_symbol<size>*
Symbol_table::define_special_symbol(const char** pname, const char** pversion,
				    bool only_if_ref,
                                    Sized_symbol<size>** poldsym,
				    bool *resolve_oldsym)
{
  *resolve_oldsym = false;

  // If the caller didn't give us a version, see if we get one from
  // the version script.
  std::string v;
  bool is_default_version = false;
  if (*pversion == NULL)
    {
      if (this->version_script_.get_symbol_version(*pname, &v))
	{
	  if (!v.empty())
	    *pversion = v.c_str();

	  // If we get the version from a version script, then we are
	  // also the default version.
	  is_default_version = true;
	}
    }

  Symbol* oldsym;
  Sized_symbol<size>* sym;

  bool add_to_table = false;
  typename Symbol_table_type::iterator add_loc = this->table_.end();
  bool add_def_to_table = false;
  typename Symbol_table_type::iterator add_def_loc = this->table_.end();

  if (only_if_ref)
    {
      oldsym = this->lookup(*pname, *pversion);
      if (oldsym == NULL && is_default_version)
	oldsym = this->lookup(*pname, NULL);
      if (oldsym == NULL || !oldsym->is_undefined())
	return NULL;

      *pname = oldsym->name();
      if (!is_default_version)
	*pversion = oldsym->version();
    }
  else
    {
      // Canonicalize NAME and VERSION.
      Stringpool::Key name_key;
      *pname = this->namepool_.add(*pname, true, &name_key);

      Stringpool::Key version_key = 0;
      if (*pversion != NULL)
	*pversion = this->namepool_.add(*pversion, true, &version_key);

      Symbol* const snull = NULL;
      std::pair<typename Symbol_table_type::iterator, bool> ins =
	this->table_.insert(std::make_pair(std::make_pair(name_key,
							  version_key),
					   snull));

      std::pair<typename Symbol_table_type::iterator, bool> insdef =
	std::make_pair(this->table_.end(), false);
      if (is_default_version)
	{
	  const Stringpool::Key vnull = 0;
	  insdef = this->table_.insert(std::make_pair(std::make_pair(name_key,
								     vnull),
						      snull));
	}

      if (!ins.second)
	{
	  // We already have a symbol table entry for NAME/VERSION.
	  oldsym = ins.first->second;
	  gold_assert(oldsym != NULL);

	  if (is_default_version)
	    {
	      Sized_symbol<size>* soldsym =
		this->get_sized_symbol<size>(oldsym);
	      this->define_default_version<size, big_endian>(soldsym,
							     insdef.second,
							     insdef.first);
	    }
	}
      else
	{
	  // We haven't seen this symbol before.
	  gold_assert(ins.first->second == NULL);

	  add_to_table = true;
	  add_loc = ins.first;

	  if (is_default_version && !insdef.second)
	    {
	      // We are adding NAME/VERSION, and it is the default
	      // version.  We already have an entry for NAME/NULL.
	      oldsym = insdef.first->second;
	      *resolve_oldsym = true;
	    }
	  else
	    {
	      oldsym = NULL;

	      if (is_default_version)
		{
		  add_def_to_table = true;
		  add_def_loc = insdef.first;
		}
	    }
	}
    }

  const Target& target = parameters->target();
  if (!target.has_make_symbol())
    sym = new Sized_symbol<size>();
  else
    {
      gold_assert(target.get_size() == size);
      gold_assert(target.is_big_endian() ? big_endian : !big_endian);
      typedef Sized_target<size, big_endian> My_target;
      const My_target* sized_target =
          static_cast<const My_target*>(&target);
      sym = sized_target->make_symbol();
      if (sym == NULL)
        return NULL;
    }

  if (add_to_table)
    add_loc->second = sym;
  else
    gold_assert(oldsym != NULL);

  if (add_def_to_table)
    add_def_loc->second = sym;

  *poldsym = this->get_sized_symbol<size>(oldsym);

  return sym;
}

// Define a symbol based on an Output_data.

Symbol*
Symbol_table::define_in_output_data(const char* name,
				    const char* version,
				    Output_data* od,
				    uint64_t value,
				    uint64_t symsize,
				    elfcpp::STT type,
				    elfcpp::STB binding,
				    elfcpp::STV visibility,
				    unsigned char nonvis,
				    bool offset_is_from_end,
				    bool only_if_ref)
{
  if (parameters->target().get_size() == 32)
    {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
      return this->do_define_in_output_data<32>(name, version, od,
                                                value, symsize, type, binding,
                                                visibility, nonvis,
                                                offset_is_from_end,
                                                only_if_ref);
#else
      gold_unreachable();
#endif
    }
  else if (parameters->target().get_size() == 64)
    {
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
      return this->do_define_in_output_data<64>(name, version, od,
                                                value, symsize, type, binding,
                                                visibility, nonvis,
                                                offset_is_from_end,
                                                only_if_ref);
#else
      gold_unreachable();
#endif
    }
  else
    gold_unreachable();
}

// Define a symbol in an Output_data, sized version.

template<int size>
Sized_symbol<size>*
Symbol_table::do_define_in_output_data(
    const char* name,
    const char* version,
    Output_data* od,
    typename elfcpp::Elf_types<size>::Elf_Addr value,
    typename elfcpp::Elf_types<size>::Elf_WXword symsize,
    elfcpp::STT type,
    elfcpp::STB binding,
    elfcpp::STV visibility,
    unsigned char nonvis,
    bool offset_is_from_end,
    bool only_if_ref)
{
  Sized_symbol<size>* sym;
  Sized_symbol<size>* oldsym;
  bool resolve_oldsym;

  if (parameters->target().is_big_endian())
    {
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
      sym = this->define_special_symbol<size, true>(&name, &version,
						    only_if_ref, &oldsym,
						    &resolve_oldsym);
#else
      gold_unreachable();
#endif
    }
  else
    {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
      sym = this->define_special_symbol<size, false>(&name, &version,
						     only_if_ref, &oldsym,
						     &resolve_oldsym);
#else
      gold_unreachable();
#endif
    }

  if (sym == NULL)
    return NULL;

  sym->init_output_data(name, version, od, value, symsize, type, binding,
			visibility, nonvis, offset_is_from_end);

  if (oldsym == NULL)
    {
      if (binding == elfcpp::STB_LOCAL
	  || this->version_script_.symbol_is_local(name))
	this->force_local(sym);
      else if (version != NULL)
	sym->set_is_default();
      return sym;
    }

  if (Symbol_table::should_override_with_special(oldsym))
    this->override_with_special(oldsym, sym);

  if (resolve_oldsym)
    return sym;
  else
    {
      delete sym;
      return oldsym;
    }
}

// Define a symbol based on an Output_segment.

Symbol*
Symbol_table::define_in_output_segment(const char* name,
				       const char* version, Output_segment* os,
				       uint64_t value,
				       uint64_t symsize,
				       elfcpp::STT type,
				       elfcpp::STB binding,
				       elfcpp::STV visibility,
				       unsigned char nonvis,
				       Symbol::Segment_offset_base offset_base,
				       bool only_if_ref)
{
  if (parameters->target().get_size() == 32)
    {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
      return this->do_define_in_output_segment<32>(name, version, os,
                                                   value, symsize, type,
                                                   binding, visibility, nonvis,
                                                   offset_base, only_if_ref);
#else
      gold_unreachable();
#endif
    }
  else if (parameters->target().get_size() == 64)
    {
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
      return this->do_define_in_output_segment<64>(name, version, os,
                                                   value, symsize, type,
                                                   binding, visibility, nonvis,
                                                   offset_base, only_if_ref);
#else
      gold_unreachable();
#endif
    }
  else
    gold_unreachable();
}

// Define a symbol in an Output_segment, sized version.

template<int size>
Sized_symbol<size>*
Symbol_table::do_define_in_output_segment(
    const char* name,
    const char* version,
    Output_segment* os,
    typename elfcpp::Elf_types<size>::Elf_Addr value,
    typename elfcpp::Elf_types<size>::Elf_WXword symsize,
    elfcpp::STT type,
    elfcpp::STB binding,
    elfcpp::STV visibility,
    unsigned char nonvis,
    Symbol::Segment_offset_base offset_base,
    bool only_if_ref)
{
  Sized_symbol<size>* sym;
  Sized_symbol<size>* oldsym;
  bool resolve_oldsym;

  if (parameters->target().is_big_endian())
    {
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
      sym = this->define_special_symbol<size, true>(&name, &version,
						    only_if_ref, &oldsym,
						    &resolve_oldsym);
#else
      gold_unreachable();
#endif
    }
  else
    {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
      sym = this->define_special_symbol<size, false>(&name, &version,
						     only_if_ref, &oldsym,
						     &resolve_oldsym);
#else
      gold_unreachable();
#endif
    }

  if (sym == NULL)
    return NULL;

  sym->init_output_segment(name, version, os, value, symsize, type, binding,
			   visibility, nonvis, offset_base);

  if (oldsym == NULL)
    {
      if (binding == elfcpp::STB_LOCAL
	  || this->version_script_.symbol_is_local(name))
	this->force_local(sym);
      else if (version != NULL)
	sym->set_is_default();
      return sym;
    }

  if (Symbol_table::should_override_with_special(oldsym))
    this->override_with_special(oldsym, sym);

  if (resolve_oldsym)
    return sym;
  else
    {
      delete sym;
      return oldsym;
    }
}

// Define a special symbol with a constant value.  It is a multiple
// definition error if this symbol is already defined.

Symbol*
Symbol_table::define_as_constant(const char* name,
				 const char* version,
				 uint64_t value,
				 uint64_t symsize,
				 elfcpp::STT type,
				 elfcpp::STB binding,
				 elfcpp::STV visibility,
				 unsigned char nonvis,
				 bool only_if_ref,
                                 bool force_override)
{
  if (parameters->target().get_size() == 32)
    {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
      return this->do_define_as_constant<32>(name, version, value,
                                             symsize, type, binding,
                                             visibility, nonvis, only_if_ref,
                                             force_override);
#else
      gold_unreachable();
#endif
    }
  else if (parameters->target().get_size() == 64)
    {
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
      return this->do_define_as_constant<64>(name, version, value,
                                             symsize, type, binding,
                                             visibility, nonvis, only_if_ref,
                                             force_override);
#else
      gold_unreachable();
#endif
    }
  else
    gold_unreachable();
}

// Define a symbol as a constant, sized version.

template<int size>
Sized_symbol<size>*
Symbol_table::do_define_as_constant(
    const char* name,
    const char* version,
    typename elfcpp::Elf_types<size>::Elf_Addr value,
    typename elfcpp::Elf_types<size>::Elf_WXword symsize,
    elfcpp::STT type,
    elfcpp::STB binding,
    elfcpp::STV visibility,
    unsigned char nonvis,
    bool only_if_ref,
    bool force_override)
{
  Sized_symbol<size>* sym;
  Sized_symbol<size>* oldsym;
  bool resolve_oldsym;

  if (parameters->target().is_big_endian())
    {
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
      sym = this->define_special_symbol<size, true>(&name, &version,
						    only_if_ref, &oldsym,
						    &resolve_oldsym);
#else
      gold_unreachable();
#endif
    }
  else
    {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
      sym = this->define_special_symbol<size, false>(&name, &version,
						     only_if_ref, &oldsym,
						     &resolve_oldsym);
#else
      gold_unreachable();
#endif
    }

  if (sym == NULL)
    return NULL;

  sym->init_constant(name, version, value, symsize, type, binding, visibility,
		     nonvis);

  if (oldsym == NULL)
    {
      // Version symbols are absolute symbols with name == version.
      // We don't want to force them to be local.
      if ((version == NULL
	   || name != version
	   || value != 0)
	  && (binding == elfcpp::STB_LOCAL
	      || this->version_script_.symbol_is_local(name)))
	this->force_local(sym);
      else if (version != NULL
	       && (name != version || value != 0))
	sym->set_is_default();
      return sym;
    }

  if (force_override || Symbol_table::should_override_with_special(oldsym))
    this->override_with_special(oldsym, sym);

  if (resolve_oldsym)
    return sym;
  else
    {
      delete sym;
      return oldsym;
    }
}

// Define a set of symbols in output sections.

void
Symbol_table::define_symbols(const Layout* layout, int count,
			     const Define_symbol_in_section* p,
			     bool only_if_ref)
{
  for (int i = 0; i < count; ++i, ++p)
    {
      Output_section* os = layout->find_output_section(p->output_section);
      if (os != NULL)
	this->define_in_output_data(p->name, NULL, os, p->value,
				    p->size, p->type, p->binding,
				    p->visibility, p->nonvis,
				    p->offset_is_from_end,
				    only_if_ref || p->only_if_ref);
      else
	this->define_as_constant(p->name, NULL, 0, p->size, p->type,
				 p->binding, p->visibility, p->nonvis,
				 only_if_ref || p->only_if_ref,
                                 false);
    }
}

// Define a set of symbols in output segments.

void
Symbol_table::define_symbols(const Layout* layout, int count,
			     const Define_symbol_in_segment* p,
			     bool only_if_ref)
{
  for (int i = 0; i < count; ++i, ++p)
    {
      Output_segment* os = layout->find_output_segment(p->segment_type,
						       p->segment_flags_set,
						       p->segment_flags_clear);
      if (os != NULL)
	this->define_in_output_segment(p->name, NULL, os, p->value,
				       p->size, p->type, p->binding,
				       p->visibility, p->nonvis,
				       p->offset_base,
				       only_if_ref || p->only_if_ref);
      else
	this->define_as_constant(p->name, NULL, 0, p->size, p->type,
				 p->binding, p->visibility, p->nonvis,
				 only_if_ref || p->only_if_ref,
                                 false);
    }
}

// Define CSYM using a COPY reloc.  POSD is the Output_data where the
// symbol should be defined--typically a .dyn.bss section.  VALUE is
// the offset within POSD.

template<int size>
void
Symbol_table::define_with_copy_reloc(
    Sized_symbol<size>* csym,
    Output_data* posd,
    typename elfcpp::Elf_types<size>::Elf_Addr value)
{
  gold_assert(csym->is_from_dynobj());
  gold_assert(!csym->is_copied_from_dynobj());
  Object* object = csym->object();
  gold_assert(object->is_dynamic());
  Dynobj* dynobj = static_cast<Dynobj*>(object);

  // Our copied variable has to override any variable in a shared
  // library.
  elfcpp::STB binding = csym->binding();
  if (binding == elfcpp::STB_WEAK)
    binding = elfcpp::STB_GLOBAL;

  this->define_in_output_data(csym->name(), csym->version(),
			      posd, value, csym->symsize(),
			      csym->type(), binding,
			      csym->visibility(), csym->nonvis(),
			      false, false);

  csym->set_is_copied_from_dynobj();
  csym->set_needs_dynsym_entry();

  this->copied_symbol_dynobjs_[csym] = dynobj;

  // We have now defined all aliases, but we have not entered them all
  // in the copied_symbol_dynobjs_ map.
  if (csym->has_alias())
    {
      Symbol* sym = csym;
      while (true)
	{
	  sym = this->weak_aliases_[sym];
	  if (sym == csym)
	    break;
	  gold_assert(sym->output_data() == posd);

	  sym->set_is_copied_from_dynobj();
	  this->copied_symbol_dynobjs_[sym] = dynobj;
	}
    }
}

// SYM is defined using a COPY reloc.  Return the dynamic object where
// the original definition was found.

Dynobj*
Symbol_table::get_copy_source(const Symbol* sym) const
{
  gold_assert(sym->is_copied_from_dynobj());
  Copied_symbol_dynobjs::const_iterator p =
    this->copied_symbol_dynobjs_.find(sym);
  gold_assert(p != this->copied_symbol_dynobjs_.end());
  return p->second;
}

// Add any undefined symbols named on the command line.

void
Symbol_table::add_undefined_symbols_from_command_line()
{
  if (parameters->options().any_undefined())
    {
      if (parameters->target().get_size() == 32)
	{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
	  this->do_add_undefined_symbols_from_command_line<32>();
#else
	  gold_unreachable();
#endif
	}
      else if (parameters->target().get_size() == 64)
	{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
	  this->do_add_undefined_symbols_from_command_line<64>();
#else
	  gold_unreachable();
#endif
	}
      else
	gold_unreachable();
    }
}

template<int size>
void
Symbol_table::do_add_undefined_symbols_from_command_line()
{
  for (options::String_set::const_iterator p =
	 parameters->options().undefined_begin();
       p != parameters->options().undefined_end();
       ++p)
    {
      const char* name = p->c_str();

      if (this->lookup(name) != NULL)
	continue;

      const char* version = NULL;

      Sized_symbol<size>* sym;
      Sized_symbol<size>* oldsym;
      bool resolve_oldsym;
      if (parameters->target().is_big_endian())
	{
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
	  sym = this->define_special_symbol<size, true>(&name, &version,
							false, &oldsym,
							&resolve_oldsym);
#else
	  gold_unreachable();
#endif
	}
      else
	{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
	  sym = this->define_special_symbol<size, false>(&name, &version,
							 false, &oldsym,
							 &resolve_oldsym);
#else
	  gold_unreachable();
#endif
	}

      gold_assert(oldsym == NULL);

      sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
			  elfcpp::STV_DEFAULT, 0);
      ++this->saw_undefined_;
    }
}

// Set the dynamic symbol indexes.  INDEX is the index of the first
// global dynamic symbol.  Pointers to the symbols are stored into the
// vector SYMS.  The names are added to DYNPOOL.  This returns an
// updated dynamic symbol index.

unsigned int
Symbol_table::set_dynsym_indexes(unsigned int index,
				 std::vector<Symbol*>* syms,
				 Stringpool* dynpool,
				 Versions* versions)
{
  for (Symbol_table_type::iterator p = this->table_.begin();
       p != this->table_.end();
       ++p)
    {
      Symbol* sym = p->second;

      // Note that SYM may already have a dynamic symbol index, since
      // some symbols appear more than once in the symbol table, with
      // and without a version.

      if (!sym->should_add_dynsym_entry())
	sym->set_dynsym_index(-1U);
      else if (!sym->has_dynsym_index())
	{
	  sym->set_dynsym_index(index);
	  ++index;
	  syms->push_back(sym);
	  dynpool->add(sym->name(), false, NULL);

	  // Record any version information.
          if (sym->version() != NULL)
            versions->record_version(this, dynpool, sym);
	}
    }

  // Finish up the versions.  In some cases this may add new dynamic
  // symbols.
  index = versions->finalize(this, index, syms);

  return index;
}

// Set the final values for all the symbols.  The index of the first
// global symbol in the output file is *PLOCAL_SYMCOUNT.  Record the
// file offset OFF.  Add their names to POOL.  Return the new file
// offset.  Update *PLOCAL_SYMCOUNT if necessary.

off_t
Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index,
		       size_t dyncount, Stringpool* pool,
		       unsigned int *plocal_symcount)
{
  off_t ret;

  gold_assert(*plocal_symcount != 0);
  this->first_global_index_ = *plocal_symcount;

  this->dynamic_offset_ = dynoff;
  this->first_dynamic_global_index_ = dyn_global_index;
  this->dynamic_count_ = dyncount;

  if (parameters->target().get_size() == 32)
    {
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE)
      ret = this->sized_finalize<32>(off, pool, plocal_symcount);
#else
      gold_unreachable();
#endif
    }
  else if (parameters->target().get_size() == 64)
    {
#if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE)
      ret = this->sized_finalize<64>(off, pool, plocal_symcount);
#else
      gold_unreachable();
#endif
    }
  else
    gold_unreachable();

  // Now that we have the final symbol table, we can reliably note
  // which symbols should get warnings.
  this->warnings_.note_warnings(this);

  return ret;
}

// SYM is going into the symbol table at *PINDEX.  Add the name to
// POOL, update *PINDEX and *POFF.

template<int size>
void
Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool,
				  unsigned int* pindex, off_t* poff)
{
  sym->set_symtab_index(*pindex);
  pool->add(sym->name(), false, NULL);
  ++*pindex;
  *poff += elfcpp::Elf_sizes<size>::sym_size;
}

// Set the final value for all the symbols.  This is called after
// Layout::finalize, so all the output sections have their final
// address.

template<int size>
off_t
Symbol_table::sized_finalize(off_t off, Stringpool* pool,
			     unsigned int* plocal_symcount)
{
  off = align_address(off, size >> 3);
  this->offset_ = off;

  unsigned int index = *plocal_symcount;
  const unsigned int orig_index = index;

  // First do all the symbols which have been forced to be local, as
  // they must appear before all global symbols.
  for (Forced_locals::iterator p = this->forced_locals_.begin();
       p != this->forced_locals_.end();
       ++p)
    {
      Symbol* sym = *p;
      gold_assert(sym->is_forced_local());
      if (this->sized_finalize_symbol<size>(sym))
	{
	  this->add_to_final_symtab<size>(sym, pool, &index, &off);
	  ++*plocal_symcount;
	}
    }

  // Now do all the remaining symbols.
  for (Symbol_table_type::iterator p = this->table_.begin();
       p != this->table_.end();
       ++p)
    {
      Symbol* sym = p->second;
      if (this->sized_finalize_symbol<size>(sym))
	this->add_to_final_symtab<size>(sym, pool, &index, &off);
    }

  this->output_count_ = index - orig_index;

  return off;
}

// Finalize the symbol SYM.  This returns true if the symbol should be
// added to the symbol table, false otherwise.

template<int size>
bool
Symbol_table::sized_finalize_symbol(Symbol* unsized_sym)
{
  typedef typename Sized_symbol<size>::Value_type Value_type;

  Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym);

  // The default version of a symbol may appear twice in the symbol
  // table.  We only need to finalize it once.
  if (sym->has_symtab_index())
    return false;

  if (!sym->in_reg())
    {
      gold_assert(!sym->has_symtab_index());
      sym->set_symtab_index(-1U);
      gold_assert(sym->dynsym_index() == -1U);
      return false;
    }

  Value_type value;

  switch (sym->source())
    {
    case Symbol::FROM_OBJECT:
      {
	bool is_ordinary;
	unsigned int shndx = sym->shndx(&is_ordinary);

	if (!is_ordinary
	    && shndx != elfcpp::SHN_ABS
	    && !Symbol::is_common_shndx(shndx))
	  {
	    gold_error(_("%s: unsupported symbol section 0x%x"),
		       sym->demangled_name().c_str(), shndx);
	    shndx = elfcpp::SHN_UNDEF;
	  }

	Object* symobj = sym->object();
	if (symobj->is_dynamic())
	  {
	    value = 0;
	    shndx = elfcpp::SHN_UNDEF;
	  }
	else if (symobj->pluginobj() != NULL)
	  {
	    value = 0;
	    shndx = elfcpp::SHN_UNDEF;
	  }
	else if (shndx == elfcpp::SHN_UNDEF)
	  value = 0;
	else if (!is_ordinary
		 && (shndx == elfcpp::SHN_ABS
		     || Symbol::is_common_shndx(shndx)))
	  value = sym->value();
	else
	  {
	    Relobj* relobj = static_cast<Relobj*>(symobj);
	    Output_section* os = relobj->output_section(shndx);

	    if (os == NULL)
	      {
		sym->set_symtab_index(-1U);
                bool static_or_reloc = (parameters->doing_static_link() ||
                                        parameters->options().relocatable());
                gold_assert(static_or_reloc || sym->dynsym_index() == -1U);

		return false;
	      }

            uint64_t secoff64 = relobj->output_section_offset(shndx);
            if (secoff64 == -1ULL)
              {
                // The section needs special handling (e.g., a merge section).
	        value = os->output_address(relobj, shndx, sym->value());
	      }
            else
              {
                Value_type secoff =
                  convert_types<Value_type, uint64_t>(secoff64);
	        if (sym->type() == elfcpp::STT_TLS)
	          value = sym->value() + os->tls_offset() + secoff;
	        else
	          value = sym->value() + os->address() + secoff;
	      }
	  }
      }
      break;

    case Symbol::IN_OUTPUT_DATA:
      {
	Output_data* od = sym->output_data();
	value = sym->value();
	if (sym->type() != elfcpp::STT_TLS)
	  value += od->address();
	else
	  {
	    Output_section* os = od->output_section();
	    gold_assert(os != NULL);
	    value += os->tls_offset() + (od->address() - os->address());
	  }
	if (sym->offset_is_from_end())
	  value += od->data_size();
      }
      break;

    case Symbol::IN_OUTPUT_SEGMENT:
      {
	Output_segment* os = sym->output_segment();
	value = sym->value();
        if (sym->type() != elfcpp::STT_TLS)
	  value += os->vaddr();
	switch (sym->offset_base())
	  {
	  case Symbol::SEGMENT_START:
	    break;
	  case Symbol::SEGMENT_END:
	    value += os->memsz();
	    break;
	  case Symbol::SEGMENT_BSS:
	    value += os->filesz();
	    break;
	  default:
	    gold_unreachable();
	  }
      }
      break;

    case Symbol::IS_CONSTANT:
      value = sym->value();
      break;

    case Symbol::IS_UNDEFINED:
      value = 0;
      break;

    default:
      gold_unreachable();
    }

  sym->set_value(value);

  if (parameters->options().strip_all())
    {
      sym->set_symtab_index(-1U);
      return false;
    }

  return true;
}

// Write out the global symbols.

void
Symbol_table::write_globals(const Stringpool* sympool,
			    const Stringpool* dynpool,
			    Output_symtab_xindex* symtab_xindex,
			    Output_symtab_xindex* dynsym_xindex,
			    Output_file* of) const
{
  switch (parameters->size_and_endianness())
    {
#ifdef HAVE_TARGET_32_LITTLE
    case Parameters::TARGET_32_LITTLE:
      this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex,
					   dynsym_xindex, of);
      break;
#endif
#ifdef HAVE_TARGET_32_BIG
    case Parameters::TARGET_32_BIG:
      this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex,
					  dynsym_xindex, of);
      break;
#endif
#ifdef HAVE_TARGET_64_LITTLE
    case Parameters::TARGET_64_LITTLE:
      this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex,
					   dynsym_xindex, of);
      break;
#endif
#ifdef HAVE_TARGET_64_BIG
    case Parameters::TARGET_64_BIG:
      this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex,
					  dynsym_xindex, of);
      break;
#endif
    default:
      gold_unreachable();
    }
}

// Write out the global symbols.

template<int size, bool big_endian>
void
Symbol_table::sized_write_globals(const Stringpool* sympool,
				  const Stringpool* dynpool,
				  Output_symtab_xindex* symtab_xindex,
				  Output_symtab_xindex* dynsym_xindex,
				  Output_file* of) const
{
  const Target& target = parameters->target();

  const int sym_size = elfcpp::Elf_sizes<size>::sym_size;

  const unsigned int output_count = this->output_count_;
  const section_size_type oview_size = output_count * sym_size;
  const unsigned int first_global_index = this->first_global_index_;
  unsigned char* psyms;
  if (this->offset_ == 0 || output_count == 0)
    psyms = NULL;
  else
    psyms = of->get_output_view(this->offset_, oview_size);

  const unsigned int dynamic_count = this->dynamic_count_;
  const section_size_type dynamic_size = dynamic_count * sym_size;
  const unsigned int first_dynamic_global_index =
    this->first_dynamic_global_index_;
  unsigned char* dynamic_view;
  if (this->dynamic_offset_ == 0 || dynamic_count == 0)
    dynamic_view = NULL;
  else
    dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size);

  for (Symbol_table_type::const_iterator p = this->table_.begin();
       p != this->table_.end();
       ++p)
    {
      Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second);

      // Possibly warn about unresolved symbols in shared libraries.
      this->warn_about_undefined_dynobj_symbol(sym);

      unsigned int sym_index = sym->symtab_index();
      unsigned int dynsym_index;
      if (dynamic_view == NULL)
	dynsym_index = -1U;
      else
	dynsym_index = sym->dynsym_index();

      if (sym_index == -1U && dynsym_index == -1U)
	{
	  // This symbol is not included in the output file.
	  continue;
	}

      unsigned int shndx;
      typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value();
      typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
      switch (sym->source())
	{
	case Symbol::FROM_OBJECT:
	  {
	    bool is_ordinary;
	    unsigned int in_shndx = sym->shndx(&is_ordinary);

	    if (!is_ordinary
		&& in_shndx != elfcpp::SHN_ABS
		&& !Symbol::is_common_shndx(in_shndx))
	      {
		gold_error(_("%s: unsupported symbol section 0x%x"),
			   sym->demangled_name().c_str(), in_shndx);
		shndx = in_shndx;
	      }
	    else
	      {
		Object* symobj = sym->object();
		if (symobj->is_dynamic())
		  {
		    if (sym->needs_dynsym_value())
		      dynsym_value = target.dynsym_value(sym);
		    shndx = elfcpp::SHN_UNDEF;
		  }
		else if (symobj->pluginobj() != NULL)
		  shndx = elfcpp::SHN_UNDEF;
		else if (in_shndx == elfcpp::SHN_UNDEF
			 || (!is_ordinary
			     && (in_shndx == elfcpp::SHN_ABS
				 || Symbol::is_common_shndx(in_shndx))))
		  shndx = in_shndx;
		else
		  {
		    Relobj* relobj = static_cast<Relobj*>(symobj);
		    Output_section* os = relobj->output_section(in_shndx);
		    gold_assert(os != NULL);
		    shndx = os->out_shndx();

		    if (shndx >= elfcpp::SHN_LORESERVE)
		      {
			if (sym_index != -1U)
			  symtab_xindex->add(sym_index, shndx);
			if (dynsym_index != -1U)
			  dynsym_xindex->add(dynsym_index, shndx);
			shndx = elfcpp::SHN_XINDEX;
		      }

		    // In object files symbol values are section
		    // relative.
		    if (parameters->options().relocatable())
		      sym_value -= os->address();
		  }
	      }
	  }
	  break;

	case Symbol::IN_OUTPUT_DATA:
	  shndx = sym->output_data()->out_shndx();
	  if (shndx >= elfcpp::SHN_LORESERVE)
	    {
	      if (sym_index != -1U)
		symtab_xindex->add(sym_index, shndx);
	      if (dynsym_index != -1U)
		dynsym_xindex->add(dynsym_index, shndx);
	      shndx = elfcpp::SHN_XINDEX;
	    }
	  break;

	case Symbol::IN_OUTPUT_SEGMENT:
	  shndx = elfcpp::SHN_ABS;
	  break;

	case Symbol::IS_CONSTANT:
	  shndx = elfcpp::SHN_ABS;
	  break;

	case Symbol::IS_UNDEFINED:
	  shndx = elfcpp::SHN_UNDEF;
	  break;

	default:
	  gold_unreachable();
	}

      if (sym_index != -1U)
	{
	  sym_index -= first_global_index;
	  gold_assert(sym_index < output_count);
	  unsigned char* ps = psyms + (sym_index * sym_size);
	  this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx,
						     sympool, ps);
	}

      if (dynsym_index != -1U)
	{
	  dynsym_index -= first_dynamic_global_index;
	  gold_assert(dynsym_index < dynamic_count);
	  unsigned char* pd = dynamic_view + (dynsym_index * sym_size);
	  this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx,
						     dynpool, pd);
	}
    }

  of->write_output_view(this->offset_, oview_size, psyms);
  if (dynamic_view != NULL)
    of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view);
}

// Write out the symbol SYM, in section SHNDX, to P.  POOL is the
// strtab holding the name.

template<int size, bool big_endian>
void
Symbol_table::sized_write_symbol(
    Sized_symbol<size>* sym,
    typename elfcpp::Elf_types<size>::Elf_Addr value,
    unsigned int shndx,
    const Stringpool* pool,
    unsigned char* p) const
{
  elfcpp::Sym_write<size, big_endian> osym(p);
  osym.put_st_name(pool->get_offset(sym->name()));
  osym.put_st_value(value);
  // Use a symbol size of zero for undefined symbols from shared libraries.
  if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj())
    osym.put_st_size(0);
  else
    osym.put_st_size(sym->symsize());
  // A version script may have overridden the default binding.
  if (sym->is_forced_local())
    osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type()));
  else
    osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type()));
  osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis()));
  osym.put_st_shndx(shndx);
}

// Check for unresolved symbols in shared libraries.  This is
// controlled by the --allow-shlib-undefined option.

// We only warn about libraries for which we have seen all the
// DT_NEEDED entries.  We don't try to track down DT_NEEDED entries
// which were not seen in this link.  If we didn't see a DT_NEEDED
// entry, we aren't going to be able to reliably report whether the
// symbol is undefined.

// We also don't warn about libraries found in a system library
// directory (e.g., /lib or /usr/lib); we assume that those libraries
// are OK.  This heuristic avoids problems on GNU/Linux, in which -ldl
// can have undefined references satisfied by ld-linux.so.

inline void
Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const
{
  bool dummy;
  if (sym->source() == Symbol::FROM_OBJECT
      && sym->object()->is_dynamic()
      && sym->shndx(&dummy) == elfcpp::SHN_UNDEF
      && sym->binding() != elfcpp::STB_WEAK
      && !parameters->options().allow_shlib_undefined()
      && !parameters->target().is_defined_by_abi(sym)
      && !sym->object()->is_in_system_directory())
    {
      // A very ugly cast.
      Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
      if (!dynobj->has_unknown_needed_entries())
        gold_undefined_symbol(sym);
    }
}

// Write out a section symbol.  Return the update offset.

void
Symbol_table::write_section_symbol(const Output_section *os,
				   Output_symtab_xindex* symtab_xindex,
				   Output_file* of,
				   off_t offset) const
{
  switch (parameters->size_and_endianness())
    {
#ifdef HAVE_TARGET_32_LITTLE
    case Parameters::TARGET_32_LITTLE:
      this->sized_write_section_symbol<32, false>(os, symtab_xindex, of,
						  offset);
      break;
#endif
#ifdef HAVE_TARGET_32_BIG
    case Parameters::TARGET_32_BIG:
      this->sized_write_section_symbol<32, true>(os, symtab_xindex, of,
						 offset);
      break;
#endif
#ifdef HAVE_TARGET_64_LITTLE
    case Parameters::TARGET_64_LITTLE:
      this->sized_write_section_symbol<64, false>(os, symtab_xindex, of,
						  offset);
      break;
#endif
#ifdef HAVE_TARGET_64_BIG
    case Parameters::TARGET_64_BIG:
      this->sized_write_section_symbol<64, true>(os, symtab_xindex, of,
						 offset);
      break;
#endif
    default:
      gold_unreachable();
    }
}

// Write out a section symbol, specialized for size and endianness.

template<int size, bool big_endian>
void
Symbol_table::sized_write_section_symbol(const Output_section* os,
					 Output_symtab_xindex* symtab_xindex,
					 Output_file* of,
					 off_t offset) const
{
  const int sym_size = elfcpp::Elf_sizes<size>::sym_size;

  unsigned char* pov = of->get_output_view(offset, sym_size);

  elfcpp::Sym_write<size, big_endian> osym(pov);
  osym.put_st_name(0);
  if (parameters->options().relocatable())
    osym.put_st_value(0);
  else
    osym.put_st_value(os->address());
  osym.put_st_size(0);
  osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL,
				       elfcpp::STT_SECTION));
  osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0));

  unsigned int shndx = os->out_shndx();
  if (shndx >= elfcpp::SHN_LORESERVE)
    {
      symtab_xindex->add(os->symtab_index(), shndx);
      shndx = elfcpp::SHN_XINDEX;
    }
  osym.put_st_shndx(shndx);

  of->write_output_view(offset, sym_size, pov);
}

// Print statistical information to stderr.  This is used for --stats.

void
Symbol_table::print_stats() const
{
#if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP)
  fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"),
	  program_name, this->table_.size(), this->table_.bucket_count());
#else
  fprintf(stderr, _("%s: symbol table entries: %zu\n"),
	  program_name, this->table_.size());
#endif
  this->namepool_.print_stats("symbol table stringpool");
}

// We check for ODR violations by looking for symbols with the same
// name for which the debugging information reports that they were
// defined in different source locations.  When comparing the source
// location, we consider instances with the same base filename and
// line number to be the same.  This is because different object
// files/shared libraries can include the same header file using
// different paths, and we don't want to report an ODR violation in
// that case.

// This struct is used to compare line information, as returned by
// Dwarf_line_info::one_addr2line.  It implements a < comparison
// operator used with std::set.

struct Odr_violation_compare
{
  bool
  operator()(const std::string& s1, const std::string& s2) const
  {
    std::string::size_type pos1 = s1.rfind('/');
    std::string::size_type pos2 = s2.rfind('/');
    if (pos1 == std::string::npos
	|| pos2 == std::string::npos)
      return s1 < s2;
    return s1.compare(pos1, std::string::npos,
		      s2, pos2, std::string::npos) < 0;
  }
};

// Check candidate_odr_violations_ to find symbols with the same name
// but apparently different definitions (different source-file/line-no).

void
Symbol_table::detect_odr_violations(const Task* task,
				    const char* output_file_name) const
{
  for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
       it != candidate_odr_violations_.end();
       ++it)
    {
      const char* symbol_name = it->first;
      // We use a sorted set so the output is deterministic.
      std::set<std::string, Odr_violation_compare> line_nums;

      for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator
               locs = it->second.begin();
           locs != it->second.end();
           ++locs)
        {
	  // We need to lock the object in order to read it.  This
	  // means that we have to run in a singleton Task.  If we
	  // want to run this in a general Task for better
	  // performance, we will need one Task for object, plus
	  // appropriate locking to ensure that we don't conflict with
	  // other uses of the object.  Also note, one_addr2line is not
          // currently thread-safe.
	  Task_lock_obj<Object> tl(task, locs->object);
          // 16 is the size of the object-cache that one_addr2line should use.
          std::string lineno = Dwarf_line_info::one_addr2line(
              locs->object, locs->shndx, locs->offset, 16);
          if (!lineno.empty())
            line_nums.insert(lineno);
        }

      if (line_nums.size() > 1)
        {
          gold_warning(_("while linking %s: symbol '%s' defined in multiple "
                         "places (possible ODR violation):"),
                       output_file_name, demangle(symbol_name).c_str());
          for (std::set<std::string>::const_iterator it2 = line_nums.begin();
               it2 != line_nums.end();
               ++it2)
            fprintf(stderr, "  %s\n", it2->c_str());
        }
    }
  // We only call one_addr2line() in this function, so we can clear its cache.
  Dwarf_line_info::clear_addr2line_cache();
}

// Warnings functions.

// Add a new warning.

void
Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj,
		      const std::string& warning)
{
  name = symtab->canonicalize_name(name);
  this->warnings_[name].set(obj, warning);
}

// Look through the warnings and mark the symbols for which we should
// warn.  This is called during Layout::finalize when we know the
// sources for all the symbols.

void
Warnings::note_warnings(Symbol_table* symtab)
{
  for (Warning_table::iterator p = this->warnings_.begin();
       p != this->warnings_.end();
       ++p)
    {
      Symbol* sym = symtab->lookup(p->first, NULL);
      if (sym != NULL
	  && sym->source() == Symbol::FROM_OBJECT
	  && sym->object() == p->second.object)
	sym->set_has_warning();
    }
}

// Issue a warning.  This is called when we see a relocation against a
// symbol for which has a warning.

template<int size, bool big_endian>
void
Warnings::issue_warning(const Symbol* sym,
			const Relocate_info<size, big_endian>* relinfo,
			size_t relnum, off_t reloffset) const
{
  gold_assert(sym->has_warning());
  Warning_table::const_iterator p = this->warnings_.find(sym->name());
  gold_assert(p != this->warnings_.end());
  gold_warning_at_location(relinfo, relnum, reloffset,
			   "%s", p->second.text.c_str());
}

// Instantiate the templates we need.  We could use the configure
// script to restrict this to only the ones needed for implemented
// targets.

#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
template
void
Sized_symbol<32>::allocate_common(Output_data*, Value_type);
#endif

#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
template
void
Sized_symbol<64>::allocate_common(Output_data*, Value_type);
#endif

#ifdef HAVE_TARGET_32_LITTLE
template
void
Symbol_table::add_from_relobj<32, false>(
    Sized_relobj<32, false>* relobj,
    const unsigned char* syms,
    size_t count,
    size_t symndx_offset,
    const char* sym_names,
    size_t sym_name_size,
    Sized_relobj<32, false>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_32_BIG
template
void
Symbol_table::add_from_relobj<32, true>(
    Sized_relobj<32, true>* relobj,
    const unsigned char* syms,
    size_t count,
    size_t symndx_offset,
    const char* sym_names,
    size_t sym_name_size,
    Sized_relobj<32, true>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_64_LITTLE
template
void
Symbol_table::add_from_relobj<64, false>(
    Sized_relobj<64, false>* relobj,
    const unsigned char* syms,
    size_t count,
    size_t symndx_offset,
    const char* sym_names,
    size_t sym_name_size,
    Sized_relobj<64, false>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_64_BIG
template
void
Symbol_table::add_from_relobj<64, true>(
    Sized_relobj<64, true>* relobj,
    const unsigned char* syms,
    size_t count,
    size_t symndx_offset,
    const char* sym_names,
    size_t sym_name_size,
    Sized_relobj<64, true>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_32_LITTLE
template
Symbol*
Symbol_table::add_from_pluginobj<32, false>(
    Sized_pluginobj<32, false>* obj,
    const char* name,
    const char* ver,
    elfcpp::Sym<32, false>* sym);
#endif

#ifdef HAVE_TARGET_32_BIG
template
Symbol*
Symbol_table::add_from_pluginobj<32, true>(
    Sized_pluginobj<32, true>* obj,
    const char* name,
    const char* ver,
    elfcpp::Sym<32, true>* sym);
#endif

#ifdef HAVE_TARGET_64_LITTLE
template
Symbol*
Symbol_table::add_from_pluginobj<64, false>(
    Sized_pluginobj<64, false>* obj,
    const char* name,
    const char* ver,
    elfcpp::Sym<64, false>* sym);
#endif

#ifdef HAVE_TARGET_64_BIG
template
Symbol*
Symbol_table::add_from_pluginobj<64, true>(
    Sized_pluginobj<64, true>* obj,
    const char* name,
    const char* ver,
    elfcpp::Sym<64, true>* sym);
#endif

#ifdef HAVE_TARGET_32_LITTLE
template
void
Symbol_table::add_from_dynobj<32, false>(
    Sized_dynobj<32, false>* dynobj,
    const unsigned char* syms,
    size_t count,
    const char* sym_names,
    size_t sym_name_size,
    const unsigned char* versym,
    size_t versym_size,
    const std::vector<const char*>* version_map,
    Sized_relobj<32, false>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_32_BIG
template
void
Symbol_table::add_from_dynobj<32, true>(
    Sized_dynobj<32, true>* dynobj,
    const unsigned char* syms,
    size_t count,
    const char* sym_names,
    size_t sym_name_size,
    const unsigned char* versym,
    size_t versym_size,
    const std::vector<const char*>* version_map,
    Sized_relobj<32, true>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_64_LITTLE
template
void
Symbol_table::add_from_dynobj<64, false>(
    Sized_dynobj<64, false>* dynobj,
    const unsigned char* syms,
    size_t count,
    const char* sym_names,
    size_t sym_name_size,
    const unsigned char* versym,
    size_t versym_size,
    const std::vector<const char*>* version_map,
    Sized_relobj<64, false>::Symbols* sympointers,
    size_t* defined);
#endif

#ifdef HAVE_TARGET_64_BIG
template
void
Symbol_table::add_from_dynobj<64, true>(
    Sized_dynobj<64, true>* dynobj,
    const unsigned char* syms,
    size_t count,
    const char* sym_names,
    size_t sym_name_size,
    const unsigned char* versym,
    size_t versym_size,
    const std::vector<const char*>* version_map,
    Sized_relobj<64, true>::Symbols* sympointers,
    size_t* defined);
#endif

#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
template
void
Symbol_table::define_with_copy_reloc<32>(
    Sized_symbol<32>* sym,
    Output_data* posd,
    elfcpp::Elf_types<32>::Elf_Addr value);
#endif

#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
template
void
Symbol_table::define_with_copy_reloc<64>(
    Sized_symbol<64>* sym,
    Output_data* posd,
    elfcpp::Elf_types<64>::Elf_Addr value);
#endif

#ifdef HAVE_TARGET_32_LITTLE
template
void
Warnings::issue_warning<32, false>(const Symbol* sym,
				   const Relocate_info<32, false>* relinfo,
				   size_t relnum, off_t reloffset) const;
#endif

#ifdef HAVE_TARGET_32_BIG
template
void
Warnings::issue_warning<32, true>(const Symbol* sym,
				  const Relocate_info<32, true>* relinfo,
				  size_t relnum, off_t reloffset) const;
#endif

#ifdef HAVE_TARGET_64_LITTLE
template
void
Warnings::issue_warning<64, false>(const Symbol* sym,
				   const Relocate_info<64, false>* relinfo,
				   size_t relnum, off_t reloffset) const;
#endif

#ifdef HAVE_TARGET_64_BIG
template
void
Warnings::issue_warning<64, true>(const Symbol* sym,
				  const Relocate_info<64, true>* relinfo,
				  size_t relnum, off_t reloffset) const;
#endif

} // End namespace gold.