aboutsummaryrefslogtreecommitdiff
path: root/bfd/dwarf2.c
blob: 856c963985cdf03568b2736dd6a3fd30d86e19f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
/* DWARF 2 support.
   Copyright (C) 1994-2017 Free Software Foundation, Inc.

   Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
   (gavin@cygnus.com).

   From the dwarf2read.c header:
   Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
   Inc.  with support from Florida State University (under contract
   with the Ada Joint Program Office), and Silicon Graphics, Inc.
   Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
   based on Fred Fish's (Cygnus Support) implementation of DWARF 1
   support in dwarfread.c

   This file is part of BFD.

   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 "sysdep.h"
#include "bfd.h"
#include "libiberty.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "dwarf2.h"

/* The data in the .debug_line statement prologue looks like this.  */

struct line_head
{
  bfd_vma total_length;
  unsigned short version;
  bfd_vma prologue_length;
  unsigned char minimum_instruction_length;
  unsigned char maximum_ops_per_insn;
  unsigned char default_is_stmt;
  int line_base;
  unsigned char line_range;
  unsigned char opcode_base;
  unsigned char *standard_opcode_lengths;
};

/* Attributes have a name and a value.  */

struct attribute
{
  enum dwarf_attribute name;
  enum dwarf_form form;
  union
  {
    char *str;
    struct dwarf_block *blk;
    bfd_uint64_t val;
    bfd_int64_t sval;
  }
  u;
};

/* Blocks are a bunch of untyped bytes.  */
struct dwarf_block
{
  unsigned int size;
  bfd_byte *data;
};

struct adjusted_section
{
  asection *section;
  bfd_vma adj_vma;
};

struct dwarf2_debug
{
  /* A list of all previously read comp_units.  */
  struct comp_unit *all_comp_units;

  /* Last comp unit in list above.  */
  struct comp_unit *last_comp_unit;

  /* Names of the debug sections.  */
  const struct dwarf_debug_section *debug_sections;

  /* The next unread compilation unit within the .debug_info section.
     Zero indicates that the .debug_info section has not been loaded
     into a buffer yet.  */
  bfd_byte *info_ptr;

  /* Pointer to the end of the .debug_info section memory buffer.  */
  bfd_byte *info_ptr_end;

  /* Pointer to the original bfd for which debug was loaded.  This is what
     we use to compare and so check that the cached debug data is still
     valid - it saves having to possibly dereference the gnu_debuglink each
     time.  */
  bfd *orig_bfd;

  /* Pointer to the bfd, section and address of the beginning of the
     section.  The bfd might be different than expected because of
     gnu_debuglink sections.  */
  bfd *bfd_ptr;
  asection *sec;
  bfd_byte *sec_info_ptr;

  /* Support for alternate debug info sections created by the DWZ utility:
     This includes a pointer to an alternate bfd which contains *extra*,
     possibly duplicate debug sections, and pointers to the loaded
     .debug_str and .debug_info sections from this bfd.  */
  bfd *          alt_bfd_ptr;
  bfd_byte *     alt_dwarf_str_buffer;
  bfd_size_type  alt_dwarf_str_size;
  bfd_byte *     alt_dwarf_info_buffer;
  bfd_size_type  alt_dwarf_info_size;

  /* A pointer to the memory block allocated for info_ptr.  Neither
     info_ptr nor sec_info_ptr are guaranteed to stay pointing to the
     beginning of the malloc block.  This is used only to free the
     memory later.  */
  bfd_byte *info_ptr_memory;

  /* Pointer to the symbol table.  */
  asymbol **syms;

  /* Pointer to the .debug_abbrev section loaded into memory.  */
  bfd_byte *dwarf_abbrev_buffer;

  /* Length of the loaded .debug_abbrev section.  */
  bfd_size_type dwarf_abbrev_size;

  /* Buffer for decode_line_info.  */
  bfd_byte *dwarf_line_buffer;

  /* Length of the loaded .debug_line section.  */
  bfd_size_type dwarf_line_size;

  /* Pointer to the .debug_str section loaded into memory.  */
  bfd_byte *dwarf_str_buffer;

  /* Length of the loaded .debug_str section.  */
  bfd_size_type dwarf_str_size;

  /* Pointer to the .debug_line_str section loaded into memory.  */
  bfd_byte *dwarf_line_str_buffer;

  /* Length of the loaded .debug_line_str section.  */
  bfd_size_type dwarf_line_str_size;

  /* Pointer to the .debug_ranges section loaded into memory.  */
  bfd_byte *dwarf_ranges_buffer;

  /* Length of the loaded .debug_ranges section.  */
  bfd_size_type dwarf_ranges_size;

  /* If the most recent call to bfd_find_nearest_line was given an
     address in an inlined function, preserve a pointer into the
     calling chain for subsequent calls to bfd_find_inliner_info to
     use.  */
  struct funcinfo *inliner_chain;

  /* Section VMAs at the time the stash was built.  */
  bfd_vma *sec_vma;

  /* Number of sections whose VMA we must adjust.  */
  int adjusted_section_count;

  /* Array of sections with adjusted VMA.  */
  struct adjusted_section *adjusted_sections;

  /* Number of times find_line is called.  This is used in
     the heuristic for enabling the info hash tables.  */
  int info_hash_count;

#define STASH_INFO_HASH_TRIGGER    100

  /* Hash table mapping symbol names to function infos.  */
  struct info_hash_table *funcinfo_hash_table;

  /* Hash table mapping symbol names to variable infos.  */
  struct info_hash_table *varinfo_hash_table;

  /* Head of comp_unit list in the last hash table update.  */
  struct comp_unit *hash_units_head;

  /* Status of info hash.  */
  int info_hash_status;
#define STASH_INFO_HASH_OFF        0
#define STASH_INFO_HASH_ON         1
#define STASH_INFO_HASH_DISABLED   2

  /* True if we opened bfd_ptr.  */
  bfd_boolean close_on_cleanup;
};

struct arange
{
  struct arange *next;
  bfd_vma low;
  bfd_vma high;
};

/* A minimal decoding of DWARF2 compilation units.  We only decode
   what's needed to get to the line number information.  */

struct comp_unit
{
  /* Chain the previously read compilation units.  */
  struct comp_unit *next_unit;

  /* Likewise, chain the compilation unit read after this one.
     The comp units are stored in reversed reading order.  */
  struct comp_unit *prev_unit;

  /* Keep the bfd convenient (for memory allocation).  */
  bfd *abfd;

  /* The lowest and highest addresses contained in this compilation
     unit as specified in the compilation unit header.  */
  struct arange arange;

  /* The DW_AT_name attribute (for error messages).  */
  char *name;

  /* The abbrev hash table.  */
  struct abbrev_info **abbrevs;

  /* DW_AT_language.  */
  int lang;

  /* Note that an error was found by comp_unit_find_nearest_line.  */
  int error;

  /* The DW_AT_comp_dir attribute.  */
  char *comp_dir;

  /* TRUE if there is a line number table associated with this comp. unit.  */
  int stmtlist;

  /* Pointer to the current comp_unit so that we can find a given entry
     by its reference.  */
  bfd_byte *info_ptr_unit;

  /* Pointer to the start of the debug section, for DW_FORM_ref_addr.  */
  bfd_byte *sec_info_ptr;

  /* The offset into .debug_line of the line number table.  */
  unsigned long line_offset;

  /* Pointer to the first child die for the comp unit.  */
  bfd_byte *first_child_die_ptr;

  /* The end of the comp unit.  */
  bfd_byte *end_ptr;

  /* The decoded line number, NULL if not yet decoded.  */
  struct line_info_table *line_table;

  /* A list of the functions found in this comp. unit.  */
  struct funcinfo *function_table;

  /* A table of function information references searchable by address.  */
  struct lookup_funcinfo *lookup_funcinfo_table;

  /* Number of functions in the function_table and sorted_function_table.  */
  bfd_size_type number_of_functions;

  /* A list of the variables found in this comp. unit.  */
  struct varinfo *variable_table;

  /* Pointer to dwarf2_debug structure.  */
  struct dwarf2_debug *stash;

  /* DWARF format version for this unit - from unit header.  */
  int version;

  /* Address size for this unit - from unit header.  */
  unsigned char addr_size;

  /* Offset size for this unit - from unit header.  */
  unsigned char offset_size;

  /* Base address for this unit - from DW_AT_low_pc attribute of
     DW_TAG_compile_unit DIE */
  bfd_vma base_address;

  /* TRUE if symbols are cached in hash table for faster lookup by name.  */
  bfd_boolean cached;
};

/* This data structure holds the information of an abbrev.  */
struct abbrev_info
{
  unsigned int number;		/* Number identifying abbrev.  */
  enum dwarf_tag tag;		/* DWARF tag.  */
  int has_children;		/* Boolean.  */
  unsigned int num_attrs;	/* Number of attributes.  */
  struct attr_abbrev *attrs;	/* An array of attribute descriptions.  */
  struct abbrev_info *next;	/* Next in chain.  */
};

struct attr_abbrev
{
  enum dwarf_attribute name;
  enum dwarf_form form;
  bfd_vma implicit_const;
};

/* Map of uncompressed DWARF debug section name to compressed one.  It
   is terminated by NULL uncompressed_name.  */

const struct dwarf_debug_section dwarf_debug_sections[] =
{
  { ".debug_abbrev",		".zdebug_abbrev" },
  { ".debug_aranges",		".zdebug_aranges" },
  { ".debug_frame",		".zdebug_frame" },
  { ".debug_info",		".zdebug_info" },
  { ".debug_info",		".zdebug_info" },
  { ".debug_line",		".zdebug_line" },
  { ".debug_loc",		".zdebug_loc" },
  { ".debug_macinfo",		".zdebug_macinfo" },
  { ".debug_macro",		".zdebug_macro" },
  { ".debug_pubnames",		".zdebug_pubnames" },
  { ".debug_pubtypes",		".zdebug_pubtypes" },
  { ".debug_ranges",		".zdebug_ranges" },
  { ".debug_static_func",	".zdebug_static_func" },
  { ".debug_static_vars",	".zdebug_static_vars" },
  { ".debug_str",		".zdebug_str", },
  { ".debug_str",		".zdebug_str", },
  { ".debug_line_str",		".zdebug_line_str", },
  { ".debug_types",		".zdebug_types" },
  /* GNU DWARF 1 extensions */
  { ".debug_sfnames",		".zdebug_sfnames" },
  { ".debug_srcinfo",		".zebug_srcinfo" },
  /* SGI/MIPS DWARF 2 extensions */
  { ".debug_funcnames",		".zdebug_funcnames" },
  { ".debug_typenames",		".zdebug_typenames" },
  { ".debug_varnames",		".zdebug_varnames" },
  { ".debug_weaknames",		".zdebug_weaknames" },
  { NULL,			NULL },
};

/* NB/ Numbers in this enum must match up with indicies
   into the dwarf_debug_sections[] array above.  */
enum dwarf_debug_section_enum
{
  debug_abbrev = 0,
  debug_aranges,
  debug_frame,
  debug_info,
  debug_info_alt,
  debug_line,
  debug_loc,
  debug_macinfo,
  debug_macro,
  debug_pubnames,
  debug_pubtypes,
  debug_ranges,
  debug_static_func,
  debug_static_vars,
  debug_str,
  debug_str_alt,
  debug_line_str,
  debug_types,
  debug_sfnames,
  debug_srcinfo,
  debug_funcnames,
  debug_typenames,
  debug_varnames,
  debug_weaknames,
  debug_max
};

/* A static assertion.  */
extern int dwarf_debug_section_assert[ARRAY_SIZE (dwarf_debug_sections)
				      == debug_max + 1 ? 1 : -1];

#ifndef ABBREV_HASH_SIZE
#define ABBREV_HASH_SIZE 121
#endif
#ifndef ATTR_ALLOC_CHUNK
#define ATTR_ALLOC_CHUNK 4
#endif

/* Variable and function hash tables.  This is used to speed up look-up
   in lookup_symbol_in_var_table() and lookup_symbol_in_function_table().
   In order to share code between variable and function infos, we use
   a list of untyped pointer for all variable/function info associated with
   a symbol.  We waste a bit of memory for list with one node but that
   simplifies the code.  */

struct info_list_node
{
  struct info_list_node *next;
  void *info;
};

/* Info hash entry.  */
struct info_hash_entry
{
  struct bfd_hash_entry root;
  struct info_list_node *head;
};

struct info_hash_table
{
  struct bfd_hash_table base;
};

/* Function to create a new entry in info hash table.  */

static struct bfd_hash_entry *
info_hash_table_newfunc (struct bfd_hash_entry *entry,
			 struct bfd_hash_table *table,
			 const char *string)
{
  struct info_hash_entry *ret = (struct info_hash_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     derived class.  */
  if (ret == NULL)
    {
      ret = (struct info_hash_entry *) bfd_hash_allocate (table,
							  sizeof (* ret));
      if (ret == NULL)
	return NULL;
    }

  /* Call the allocation method of the base class.  */
  ret = ((struct info_hash_entry *)
	 bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));

  /* Initialize the local fields here.  */
  if (ret)
    ret->head = NULL;

  return (struct bfd_hash_entry *) ret;
}

/* Function to create a new info hash table.  It returns a pointer to the
   newly created table or NULL if there is any error.  We need abfd
   solely for memory allocation.  */

static struct info_hash_table *
create_info_hash_table (bfd *abfd)
{
  struct info_hash_table *hash_table;

  hash_table = ((struct info_hash_table *)
		bfd_alloc (abfd, sizeof (struct info_hash_table)));
  if (!hash_table)
    return hash_table;

  if (!bfd_hash_table_init (&hash_table->base, info_hash_table_newfunc,
			    sizeof (struct info_hash_entry)))
    {
      bfd_release (abfd, hash_table);
      return NULL;
    }

  return hash_table;
}

/* Insert an info entry into an info hash table.  We do not check of
   duplicate entries.  Also, the caller need to guarantee that the
   right type of info in inserted as info is passed as a void* pointer.
   This function returns true if there is no error.  */

static bfd_boolean
insert_info_hash_table (struct info_hash_table *hash_table,
			const char *key,
			void *info,
			bfd_boolean copy_p)
{
  struct info_hash_entry *entry;
  struct info_list_node *node;

  entry = (struct info_hash_entry*) bfd_hash_lookup (&hash_table->base,
						     key, TRUE, copy_p);
  if (!entry)
    return FALSE;

  node = (struct info_list_node *) bfd_hash_allocate (&hash_table->base,
						      sizeof (*node));
  if (!node)
    return FALSE;

  node->info = info;
  node->next = entry->head;
  entry->head = node;

  return TRUE;
}

/* Look up an info entry list from an info hash table.  Return NULL
   if there is none.  */

static struct info_list_node *
lookup_info_hash_table (struct info_hash_table *hash_table, const char *key)
{
  struct info_hash_entry *entry;

  entry = (struct info_hash_entry*) bfd_hash_lookup (&hash_table->base, key,
						     FALSE, FALSE);
  return entry ? entry->head : NULL;
}

/* Read a section into its appropriate place in the dwarf2_debug
   struct (indicated by SECTION_BUFFER and SECTION_SIZE).  If SYMS is
   not NULL, use bfd_simple_get_relocated_section_contents to read the
   section contents, otherwise use bfd_get_section_contents.  Fail if
   the located section does not contain at least OFFSET bytes.  */

static bfd_boolean
read_section (bfd *           abfd,
	      const struct dwarf_debug_section *sec,
	      asymbol **      syms,
	      bfd_uint64_t    offset,
	      bfd_byte **     section_buffer,
	      bfd_size_type * section_size)
{
  asection *msec;
  const char *section_name = sec->uncompressed_name;

  /* The section may have already been read.  */
  if (*section_buffer == NULL)
    {
      msec = bfd_get_section_by_name (abfd, section_name);
      if (! msec)
	{
	  section_name = sec->compressed_name;
	  if (section_name != NULL)
	    msec = bfd_get_section_by_name (abfd, section_name);
	}
      if (! msec)
	{
	  _bfd_error_handler (_("Dwarf Error: Can't find %s section."),
			      sec->uncompressed_name);
	  bfd_set_error (bfd_error_bad_value);
	  return FALSE;
	}

      *section_size = msec->rawsize ? msec->rawsize : msec->size;
      if (syms)
	{
	  *section_buffer
	    = bfd_simple_get_relocated_section_contents (abfd, msec, NULL, syms);
	  if (! *section_buffer)
	    return FALSE;
	}
      else
	{
	  *section_buffer = (bfd_byte *) bfd_malloc (*section_size);
	  if (! *section_buffer)
	    return FALSE;
	  if (! bfd_get_section_contents (abfd, msec, *section_buffer,
					  0, *section_size))
	    return FALSE;
	}

      /* Paranoia - if we are reading in a string section, make sure that it
	 is NUL terminated.  This is to prevent string functions from running
	 off the end of the buffer.  Note - knowing the size of the buffer is
	 not enough as some functions, eg strchr, do not have a range limited
	 equivalent.

	 FIXME: We ought to use a flag in the dwarf_debug_sections[] table to
	 determine the nature of a debug section, rather than checking the
	 section name as we do here.  */
      if (*section_size > 0
	  && (*section_buffer)[*section_size - 1] != 0
	  && (strstr (section_name, "_str") || strstr (section_name, "names")))
	{
	  bfd_byte * new_buffer = malloc (*section_size + 1);

	  _bfd_error_handler (_("warning: dwarf string section '%s' is not NUL terminated"),
			      section_name);
	  memcpy (new_buffer, *section_buffer, *section_size);
	  new_buffer[*section_size] = 0;
	  free (*section_buffer);
	  *section_buffer = new_buffer;
	}
    }

  /* It is possible to get a bad value for the offset into the section
     that the client wants.  Validate it here to avoid trouble later.  */
  if (offset != 0 && offset >= *section_size)
    {
      /* xgettext: c-format */
      _bfd_error_handler (_("Dwarf Error: Offset (%llu)"
			    " greater than or equal to %s size (%Lu)."),
			  (long long) offset, section_name, *section_size);
      bfd_set_error (bfd_error_bad_value);
      return FALSE;
    }

  return TRUE;
}

/* Read dwarf information from a buffer.  */

static unsigned int
read_1_byte (bfd *abfd ATTRIBUTE_UNUSED, bfd_byte *buf, bfd_byte *end)
{
  if (buf + 1 > end)
    return 0;
  return bfd_get_8 (abfd, buf);
}

static int
read_1_signed_byte (bfd *abfd ATTRIBUTE_UNUSED, bfd_byte *buf, bfd_byte *end)
{
  if (buf + 1 > end)
    return 0;
  return bfd_get_signed_8 (abfd, buf);
}

static unsigned int
read_2_bytes (bfd *abfd, bfd_byte *buf, bfd_byte *end)
{
  if (buf + 2 > end)
    return 0;
  return bfd_get_16 (abfd, buf);
}

static unsigned int
read_4_bytes (bfd *abfd, bfd_byte *buf, bfd_byte *end)
{
  if (buf + 4 > end)
    return 0;
  return bfd_get_32 (abfd, buf);
}

static bfd_uint64_t
read_8_bytes (bfd *abfd, bfd_byte *buf, bfd_byte *end)
{
  if (buf + 8 > end)
    return 0;
  return bfd_get_64 (abfd, buf);
}

static bfd_byte *
read_n_bytes (bfd *abfd ATTRIBUTE_UNUSED,
	      bfd_byte *buf,
	      bfd_byte *end,
	      unsigned int size ATTRIBUTE_UNUSED)
{
  if (buf + size > end)
    return NULL;
  return buf;
}

/* Scans a NUL terminated string starting at BUF, returning a pointer to it.
   Returns the number of characters in the string, *including* the NUL byte,
   in BYTES_READ_PTR.  This value is set even if the function fails.  Bytes
   at or beyond BUF_END will not be read.  Returns NULL if there was a
   problem, or if the string is empty.  */

static char *
read_string (bfd *          abfd ATTRIBUTE_UNUSED,
	     bfd_byte *     buf,
	     bfd_byte *     buf_end,
	     unsigned int * bytes_read_ptr)
{
  bfd_byte *str = buf;

  if (buf >= buf_end)
    {
      * bytes_read_ptr = 0;
      return NULL;
    }

  if (*str == '\0')
    {
      * bytes_read_ptr = 1;
      return NULL;
    }

  while (buf < buf_end)
    if (* buf ++ == 0)
      {
	* bytes_read_ptr = buf - str;
	return (char *) str;
      }

  * bytes_read_ptr = buf - str;
  return NULL;
}

/* Reads an offset from BUF and then locates the string at this offset
   inside the debug string section.  Returns a pointer to the string.
   Returns the number of bytes read from BUF, *not* the length of the string,
   in BYTES_READ_PTR.  This value is set even if the function fails.  Bytes
   at or beyond BUF_END will not be read from BUF.  Returns NULL if there was
   a problem, or if the string is empty.  Does not check for NUL termination
   of the string.  */

static char *
read_indirect_string (struct comp_unit * unit,
		      bfd_byte *         buf,
		      bfd_byte *         buf_end,
		      unsigned int *     bytes_read_ptr)
{
  bfd_uint64_t offset;
  struct dwarf2_debug *stash = unit->stash;
  char *str;

  if (buf + unit->offset_size > buf_end)
    {
      * bytes_read_ptr = 0;
      return NULL;
    }

  if (unit->offset_size == 4)
    offset = read_4_bytes (unit->abfd, buf, buf_end);
  else
    offset = read_8_bytes (unit->abfd, buf, buf_end);

  *bytes_read_ptr = unit->offset_size;

  if (! read_section (unit->abfd, &stash->debug_sections[debug_str],
		      stash->syms, offset,
		      &stash->dwarf_str_buffer, &stash->dwarf_str_size))
    return NULL;

  if (offset >= stash->dwarf_str_size)
    return NULL;
  str = (char *) stash->dwarf_str_buffer + offset;
  if (*str == '\0')
    return NULL;
  return str;
}

/* Like read_indirect_string but from .debug_line_str section.  */

static char *
read_indirect_line_string (struct comp_unit * unit,
			   bfd_byte *         buf,
			   bfd_byte *         buf_end,
			   unsigned int *     bytes_read_ptr)
{
  bfd_uint64_t offset;
  struct dwarf2_debug *stash = unit->stash;
  char *str;

  if (buf + unit->offset_size > buf_end)
    {
      * bytes_read_ptr = 0;
      return NULL;
    }

  if (unit->offset_size == 4)
    offset = read_4_bytes (unit->abfd, buf, buf_end);
  else
    offset = read_8_bytes (unit->abfd, buf, buf_end);

  *bytes_read_ptr = unit->offset_size;

  if (! read_section (unit->abfd, &stash->debug_sections[debug_line_str],
		      stash->syms, offset,
		      &stash->dwarf_line_str_buffer,
		      &stash->dwarf_line_str_size))
    return NULL;

  if (offset >= stash->dwarf_line_str_size)
    return NULL;
  str = (char *) stash->dwarf_line_str_buffer + offset;
  if (*str == '\0')
    return NULL;
  return str;
}

/* Like read_indirect_string but uses a .debug_str located in
   an alternate file pointed to by the .gnu_debugaltlink section.
   Used to impement DW_FORM_GNU_strp_alt.  */

static char *
read_alt_indirect_string (struct comp_unit * unit,
			  bfd_byte *         buf,
			  bfd_byte *         buf_end,
			  unsigned int *     bytes_read_ptr)
{
  bfd_uint64_t offset;
  struct dwarf2_debug *stash = unit->stash;
  char *str;

  if (buf + unit->offset_size > buf_end)
    {
      * bytes_read_ptr = 0;
      return NULL;
    }

  if (unit->offset_size == 4)
    offset = read_4_bytes (unit->abfd, buf, buf_end);
  else
    offset = read_8_bytes (unit->abfd, buf, buf_end);

  *bytes_read_ptr = unit->offset_size;

  if (stash->alt_bfd_ptr == NULL)
    {
      bfd *  debug_bfd;
      char * debug_filename = bfd_follow_gnu_debugaltlink (unit->abfd, DEBUGDIR);

      if (debug_filename == NULL)
	return NULL;

      if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL
	  || ! bfd_check_format (debug_bfd, bfd_object))
	{
	  if (debug_bfd)
	    bfd_close (debug_bfd);

	  /* FIXME: Should we report our failure to follow the debuglink ?  */
	  free (debug_filename);
	  return NULL;
	}
      stash->alt_bfd_ptr = debug_bfd;
    }

  if (! read_section (unit->stash->alt_bfd_ptr,
		      stash->debug_sections + debug_str_alt,
		      NULL, /* FIXME: Do we need to load alternate symbols ?  */
		      offset,
		      &stash->alt_dwarf_str_buffer,
		      &stash->alt_dwarf_str_size))
    return NULL;

  if (offset >= stash->alt_dwarf_str_size)
    return NULL;
  str = (char *) stash->alt_dwarf_str_buffer + offset;
  if (*str == '\0')
    return NULL;

  return str;
}

/* Resolve an alternate reference from UNIT at OFFSET.
   Returns a pointer into the loaded alternate CU upon success
   or NULL upon failure.  */

static bfd_byte *
read_alt_indirect_ref (struct comp_unit * unit,
		       bfd_uint64_t       offset)
{
  struct dwarf2_debug *stash = unit->stash;

  if (stash->alt_bfd_ptr == NULL)
    {
      bfd *  debug_bfd;
      char * debug_filename = bfd_follow_gnu_debugaltlink (unit->abfd, DEBUGDIR);

      if (debug_filename == NULL)
	return FALSE;

      if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL
	  || ! bfd_check_format (debug_bfd, bfd_object))
	{
	  if (debug_bfd)
	    bfd_close (debug_bfd);

	  /* FIXME: Should we report our failure to follow the debuglink ?  */
	  free (debug_filename);
	  return NULL;
	}
      stash->alt_bfd_ptr = debug_bfd;
    }

  if (! read_section (unit->stash->alt_bfd_ptr,
		      stash->debug_sections + debug_info_alt,
		      NULL, /* FIXME: Do we need to load alternate symbols ?  */
		      offset,
		      &stash->alt_dwarf_info_buffer,
		      &stash->alt_dwarf_info_size))
    return NULL;

  if (offset >= stash->alt_dwarf_info_size)
    return NULL;
  return stash->alt_dwarf_info_buffer + offset;
}

static bfd_uint64_t
read_address (struct comp_unit *unit, bfd_byte *buf, bfd_byte * buf_end)
{
  int signed_vma = 0;

  if (bfd_get_flavour (unit->abfd) == bfd_target_elf_flavour)
    signed_vma = get_elf_backend_data (unit->abfd)->sign_extend_vma;

  if (buf + unit->addr_size > buf_end)
    return 0;

  if (signed_vma)
    {
      switch (unit->addr_size)
	{
	case 8:
	  return bfd_get_signed_64 (unit->abfd, buf);
	case 4:
	  return bfd_get_signed_32 (unit->abfd, buf);
	case 2:
	  return bfd_get_signed_16 (unit->abfd, buf);
	default:
	  abort ();
	}
    }
  else
    {
      switch (unit->addr_size)
	{
	case 8:
	  return bfd_get_64 (unit->abfd, buf);
	case 4:
	  return bfd_get_32 (unit->abfd, buf);
	case 2:
	  return bfd_get_16 (unit->abfd, buf);
	default:
	  abort ();
	}
    }
}

/* Lookup an abbrev_info structure in the abbrev hash table.  */

static struct abbrev_info *
lookup_abbrev (unsigned int number, struct abbrev_info **abbrevs)
{
  unsigned int hash_number;
  struct abbrev_info *abbrev;

  hash_number = number % ABBREV_HASH_SIZE;
  abbrev = abbrevs[hash_number];

  while (abbrev)
    {
      if (abbrev->number == number)
	return abbrev;
      else
	abbrev = abbrev->next;
    }

  return NULL;
}

/* In DWARF version 2, the description of the debugging information is
   stored in a separate .debug_abbrev section.  Before we read any
   dies from a section we read in all abbreviations and install them
   in a hash table.  */

static struct abbrev_info**
read_abbrevs (bfd *abfd, bfd_uint64_t offset, struct dwarf2_debug *stash)
{
  struct abbrev_info **abbrevs;
  bfd_byte *abbrev_ptr;
  bfd_byte *abbrev_end;
  struct abbrev_info *cur_abbrev;
  unsigned int abbrev_number, bytes_read, abbrev_name;
  unsigned int abbrev_form, hash_number;
  bfd_size_type amt;

  if (! read_section (abfd, &stash->debug_sections[debug_abbrev],
		      stash->syms, offset,
		      &stash->dwarf_abbrev_buffer, &stash->dwarf_abbrev_size))
    return NULL;

  if (offset >= stash->dwarf_abbrev_size)
    return NULL;

  amt = sizeof (struct abbrev_info*) * ABBREV_HASH_SIZE;
  abbrevs = (struct abbrev_info **) bfd_zalloc (abfd, amt);
  if (abbrevs == NULL)
    return NULL;

  abbrev_ptr = stash->dwarf_abbrev_buffer + offset;
  abbrev_end = stash->dwarf_abbrev_buffer + stash->dwarf_abbrev_size;
  abbrev_number = _bfd_safe_read_leb128 (abfd, abbrev_ptr, &bytes_read,
					 FALSE, abbrev_end);
  abbrev_ptr += bytes_read;

  /* Loop until we reach an abbrev number of 0.  */
  while (abbrev_number)
    {
      amt = sizeof (struct abbrev_info);
      cur_abbrev = (struct abbrev_info *) bfd_zalloc (abfd, amt);
      if (cur_abbrev == NULL)
	return NULL;

      /* Read in abbrev header.  */
      cur_abbrev->number = abbrev_number;
      cur_abbrev->tag = (enum dwarf_tag)
	_bfd_safe_read_leb128 (abfd, abbrev_ptr, &bytes_read,
			       FALSE, abbrev_end);
      abbrev_ptr += bytes_read;
      cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr, abbrev_end);
      abbrev_ptr += 1;

      /* Now read in declarations.  */
      for (;;)
	{
	  /* Initialize it just to avoid a GCC false warning.  */
	  bfd_vma implicit_const = -1;

	  abbrev_name = _bfd_safe_read_leb128 (abfd, abbrev_ptr, &bytes_read,
					       FALSE, abbrev_end);
	  abbrev_ptr += bytes_read;
	  abbrev_form = _bfd_safe_read_leb128 (abfd, abbrev_ptr, &bytes_read,
					       FALSE, abbrev_end);
	  abbrev_ptr += bytes_read;
	  if (abbrev_form == DW_FORM_implicit_const)
	    {
	      implicit_const = _bfd_safe_read_leb128 (abfd, abbrev_ptr,
						      &bytes_read, TRUE,
						      abbrev_end);
	      abbrev_ptr += bytes_read;
	    }

	  if (abbrev_name == 0)
	    break;

	  if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
	    {
	      struct attr_abbrev *tmp;

	      amt = cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK;
	      amt *= sizeof (struct attr_abbrev);
	      tmp = (struct attr_abbrev *) bfd_realloc (cur_abbrev->attrs, amt);
	      if (tmp == NULL)
		{
		  size_t i;

		  for (i = 0; i < ABBREV_HASH_SIZE; i++)
		    {
		      struct abbrev_info *abbrev = abbrevs[i];

		      while (abbrev)
			{
			  free (abbrev->attrs);
			  abbrev = abbrev->next;
			}
		    }
		  return NULL;
		}
	      cur_abbrev->attrs = tmp;
	    }

	  cur_abbrev->attrs[cur_abbrev->num_attrs].name
	    = (enum dwarf_attribute) abbrev_name;
	  cur_abbrev->attrs[cur_abbrev->num_attrs].form
	    = (enum dwarf_form) abbrev_form;
	  cur_abbrev->attrs[cur_abbrev->num_attrs].implicit_const
	    = implicit_const;
	  ++cur_abbrev->num_attrs;
	}

      hash_number = abbrev_number % ABBREV_HASH_SIZE;
      cur_abbrev->next = abbrevs[hash_number];
      abbrevs[hash_number] = cur_abbrev;

      /* Get next abbreviation.
	 Under Irix6 the abbreviations for a compilation unit are not
	 always properly terminated with an abbrev number of 0.
	 Exit loop if we encounter an abbreviation which we have
	 already read (which means we are about to read the abbreviations
	 for the next compile unit) or if the end of the abbreviation
	 table is reached.  */
      if ((unsigned int) (abbrev_ptr - stash->dwarf_abbrev_buffer)
	  >= stash->dwarf_abbrev_size)
	break;
      abbrev_number = _bfd_safe_read_leb128 (abfd, abbrev_ptr,
					     &bytes_read, FALSE, abbrev_end);
      abbrev_ptr += bytes_read;
      if (lookup_abbrev (abbrev_number, abbrevs) != NULL)
	break;
    }

  return abbrevs;
}

/* Returns true if the form is one which has a string value.  */

static inline bfd_boolean
is_str_attr (enum dwarf_form form)
{
  return (form == DW_FORM_string || form == DW_FORM_strp
	  || form == DW_FORM_line_strp || form == DW_FORM_GNU_strp_alt);
}

/* Read and fill in the value of attribute ATTR as described by FORM.
   Read data starting from INFO_PTR, but never at or beyond INFO_PTR_END.
   Returns an updated INFO_PTR taking into account the amount of data read.  */

static bfd_byte *
read_attribute_value (struct attribute *  attr,
		      unsigned            form,
		      bfd_vma             implicit_const,
		      struct comp_unit *  unit,
		      bfd_byte *          info_ptr,
		      bfd_byte *          info_ptr_end)
{
  bfd *abfd = unit->abfd;
  unsigned int bytes_read;
  struct dwarf_block *blk;
  bfd_size_type amt;

  if (info_ptr >= info_ptr_end && form != DW_FORM_flag_present)
    {
      _bfd_error_handler (_("Dwarf Error: Info pointer extends beyond end of attributes"));
      bfd_set_error (bfd_error_bad_value);
      return info_ptr;
    }

  attr->form = (enum dwarf_form) form;

  switch (form)
    {
    case DW_FORM_ref_addr:
      /* DW_FORM_ref_addr is an address in DWARF2, and an offset in
	 DWARF3.  */
      if (unit->version == 3 || unit->version == 4)
	{
	  if (unit->offset_size == 4)
	    attr->u.val = read_4_bytes (unit->abfd, info_ptr, info_ptr_end);
	  else
	    attr->u.val = read_8_bytes (unit->abfd, info_ptr, info_ptr_end);
	  info_ptr += unit->offset_size;
	  break;
	}
      /* FALLTHROUGH */
    case DW_FORM_addr:
      attr->u.val = read_address (unit, info_ptr, info_ptr_end);
      info_ptr += unit->addr_size;
      break;
    case DW_FORM_GNU_ref_alt:
    case DW_FORM_sec_offset:
      if (unit->offset_size == 4)
	attr->u.val = read_4_bytes (unit->abfd, info_ptr, info_ptr_end);
      else
	attr->u.val = read_8_bytes (unit->abfd, info_ptr, info_ptr_end);
      info_ptr += unit->offset_size;
      break;
    case DW_FORM_block2:
      amt = sizeof (struct dwarf_block);
      blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
      if (blk == NULL)
	return NULL;
      blk->size = read_2_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 2;
      blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
      info_ptr += blk->size;
      attr->u.blk = blk;
      break;
    case DW_FORM_block4:
      amt = sizeof (struct dwarf_block);
      blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
      if (blk == NULL)
	return NULL;
      blk->size = read_4_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 4;
      blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
      info_ptr += blk->size;
      attr->u.blk = blk;
      break;
    case DW_FORM_data2:
      attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 2;
      break;
    case DW_FORM_data4:
      attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 4;
      break;
    case DW_FORM_data8:
      attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 8;
      break;
    case DW_FORM_string:
      attr->u.str = read_string (abfd, info_ptr, info_ptr_end, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_strp:
      attr->u.str = read_indirect_string (unit, info_ptr, info_ptr_end, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_line_strp:
      attr->u.str = read_indirect_line_string (unit, info_ptr, info_ptr_end, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_GNU_strp_alt:
      attr->u.str = read_alt_indirect_string (unit, info_ptr, info_ptr_end, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_exprloc:
    case DW_FORM_block:
      amt = sizeof (struct dwarf_block);
      blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
      if (blk == NULL)
	return NULL;
      blk->size = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					 FALSE, info_ptr_end);
      info_ptr += bytes_read;
      blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
      info_ptr += blk->size;
      attr->u.blk = blk;
      break;
    case DW_FORM_block1:
      amt = sizeof (struct dwarf_block);
      blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
      if (blk == NULL)
	return NULL;
      blk->size = read_1_byte (abfd, info_ptr, info_ptr_end);
      info_ptr += 1;
      blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
      info_ptr += blk->size;
      attr->u.blk = blk;
      break;
    case DW_FORM_data1:
      attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
      info_ptr += 1;
      break;
    case DW_FORM_flag:
      attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
      info_ptr += 1;
      break;
    case DW_FORM_flag_present:
      attr->u.val = 1;
      break;
    case DW_FORM_sdata:
      attr->u.sval = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					    TRUE, info_ptr_end);
      info_ptr += bytes_read;
      break;
    case DW_FORM_udata:
      attr->u.val = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					   FALSE, info_ptr_end);
      info_ptr += bytes_read;
      break;
    case DW_FORM_ref1:
      attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
      info_ptr += 1;
      break;
    case DW_FORM_ref2:
      attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 2;
      break;
    case DW_FORM_ref4:
      attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 4;
      break;
    case DW_FORM_ref8:
      attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 8;
      break;
    case DW_FORM_ref_sig8:
      attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
      info_ptr += 8;
      break;
    case DW_FORM_ref_udata:
      attr->u.val = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					   FALSE, info_ptr_end);
      info_ptr += bytes_read;
      break;
    case DW_FORM_indirect:
      form = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
				    FALSE, info_ptr_end);
      info_ptr += bytes_read;
      if (form == DW_FORM_implicit_const)
	{
	  implicit_const = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
						  TRUE, info_ptr_end);
	  info_ptr += bytes_read;
	}
      info_ptr = read_attribute_value (attr, form, implicit_const, unit,
				       info_ptr, info_ptr_end);
      break;
    case DW_FORM_implicit_const:
      attr->form = DW_FORM_sdata;
      attr->u.sval = implicit_const;
      break;
    default:
      _bfd_error_handler (_("Dwarf Error: Invalid or unhandled FORM value: %#x."),
			  form);
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }
  return info_ptr;
}

/* Read an attribute described by an abbreviated attribute.  */

static bfd_byte *
read_attribute (struct attribute *    attr,
		struct attr_abbrev *  abbrev,
		struct comp_unit *    unit,
		bfd_byte *            info_ptr,
		bfd_byte *            info_ptr_end)
{
  attr->name = abbrev->name;
  info_ptr = read_attribute_value (attr, abbrev->form, abbrev->implicit_const,
				   unit, info_ptr, info_ptr_end);
  return info_ptr;
}

/* Return whether DW_AT_name will return the same as DW_AT_linkage_name
   for a function.  */

static bfd_boolean
non_mangled (int lang)
{
  switch (lang)
    {
    default:
      return FALSE;

    case DW_LANG_C89:
    case DW_LANG_C:
    case DW_LANG_Ada83:
    case DW_LANG_Cobol74:
    case DW_LANG_Cobol85:
    case DW_LANG_Fortran77:
    case DW_LANG_Pascal83:
    case DW_LANG_C99:
    case DW_LANG_Ada95:
    case DW_LANG_PLI:
    case DW_LANG_UPC:
    case DW_LANG_C11:
      return TRUE;
    }
}

/* Source line information table routines.  */

#define FILE_ALLOC_CHUNK 5
#define DIR_ALLOC_CHUNK 5

struct line_info
{
  struct line_info *	prev_line;
  bfd_vma		address;
  char *		filename;
  unsigned int		line;
  unsigned int		column;
  unsigned int		discriminator;
  unsigned char		op_index;
  unsigned char		end_sequence;		/* End of (sequential) code sequence.  */
};

struct fileinfo
{
  char *		name;
  unsigned int		dir;
  unsigned int		time;
  unsigned int		size;
};

struct line_sequence
{
  bfd_vma               low_pc;
  struct line_sequence* prev_sequence;
  struct line_info*     last_line;  /* Largest VMA.  */
  struct line_info**    line_info_lookup;
  bfd_size_type		num_lines;
};

struct line_info_table
{
  bfd *                 abfd;
  unsigned int          num_files;
  unsigned int          num_dirs;
  unsigned int          num_sequences;
  char *                comp_dir;
  char **               dirs;
  struct fileinfo*      files;
  struct line_sequence* sequences;
  struct line_info*     lcl_head;   /* Local head; used in 'add_line_info'.  */
};

/* Remember some information about each function.  If the function is
   inlined (DW_TAG_inlined_subroutine) it may have two additional
   attributes, DW_AT_call_file and DW_AT_call_line, which specify the
   source code location where this function was inlined.  */

struct funcinfo
{
  /* Pointer to previous function in list of all functions.  */
  struct funcinfo *	prev_func;
  /* Pointer to function one scope higher.  */
  struct funcinfo *	caller_func;
  /* Source location file name where caller_func inlines this func.  */
  char *		caller_file;
  /* Source location file name.  */
  char *		file;
  /* Source location line number where caller_func inlines this func.  */
  int			caller_line;
  /* Source location line number.  */
  int			line;
  int			tag;
  bfd_boolean		is_linkage;
  const char *		name;
  struct arange		arange;
  /* Where the symbol is defined.  */
  asection *		sec;
};

struct lookup_funcinfo
{
  /* Function information corresponding to this lookup table entry.  */
  struct funcinfo *	funcinfo;

  /* The lowest address for this specific function.  */
  bfd_vma 		low_addr;

  /* The highest address of this function before the lookup table is sorted.
     The highest address of all prior functions after the lookup table is
     sorted, which is used for binary search.  */
  bfd_vma 		high_addr;
};

struct varinfo
{
  /* Pointer to previous variable in list of all variables */
  struct varinfo *prev_var;
  /* Source location file name */
  char *file;
  /* Source location line number */
  int line;
  int tag;
  char *name;
  bfd_vma addr;
  /* Where the symbol is defined */
  asection *sec;
  /* Is this a stack variable? */
  unsigned int stack: 1;
};

/* Return TRUE if NEW_LINE should sort after LINE.  */

static inline bfd_boolean
new_line_sorts_after (struct line_info *new_line, struct line_info *line)
{
  return (new_line->address > line->address
	  || (new_line->address == line->address
	      && (new_line->op_index > line->op_index
		  || (new_line->op_index == line->op_index
		      && new_line->end_sequence < line->end_sequence))));
}


/* Adds a new entry to the line_info list in the line_info_table, ensuring
   that the list is sorted.  Note that the line_info list is sorted from
   highest to lowest VMA (with possible duplicates); that is,
   line_info->prev_line always accesses an equal or smaller VMA.  */

static bfd_boolean
add_line_info (struct line_info_table *table,
	       bfd_vma address,
	       unsigned char op_index,
	       char *filename,
	       unsigned int line,
	       unsigned int column,
	       unsigned int discriminator,
	       int end_sequence)
{
  bfd_size_type amt = sizeof (struct line_info);
  struct line_sequence* seq = table->sequences;
  struct line_info* info = (struct line_info *) bfd_alloc (table->abfd, amt);

  if (info == NULL)
    return FALSE;

  /* Set member data of 'info'.  */
  info->prev_line = NULL;
  info->address = address;
  info->op_index = op_index;
  info->line = line;
  info->column = column;
  info->discriminator = discriminator;
  info->end_sequence = end_sequence;

  if (filename && filename[0])
    {
      info->filename = (char *) bfd_alloc (table->abfd, strlen (filename) + 1);
      if (info->filename == NULL)
	return FALSE;
      strcpy (info->filename, filename);
    }
  else
    info->filename = NULL;

  /* Find the correct location for 'info'.  Normally we will receive
     new line_info data 1) in order and 2) with increasing VMAs.
     However some compilers break the rules (cf. decode_line_info) and
     so we include some heuristics for quickly finding the correct
     location for 'info'. In particular, these heuristics optimize for
     the common case in which the VMA sequence that we receive is a
     list of locally sorted VMAs such as
       p...z a...j  (where a < j < p < z)

     Note: table->lcl_head is used to head an *actual* or *possible*
     sub-sequence within the list (such as a...j) that is not directly
     headed by table->last_line

     Note: we may receive duplicate entries from 'decode_line_info'.  */

  if (seq
      && seq->last_line->address == address
      && seq->last_line->op_index == op_index
      && seq->last_line->end_sequence == end_sequence)
    {
      /* We only keep the last entry with the same address and end
	 sequence.  See PR ld/4986.  */
      if (table->lcl_head == seq->last_line)
	table->lcl_head = info;
      info->prev_line = seq->last_line->prev_line;
      seq->last_line = info;
    }
  else if (!seq || seq->last_line->end_sequence)
    {
      /* Start a new line sequence.  */
      amt = sizeof (struct line_sequence);
      seq = (struct line_sequence *) bfd_malloc (amt);
      if (seq == NULL)
	return FALSE;
      seq->low_pc = address;
      seq->prev_sequence = table->sequences;
      seq->last_line = info;
      table->lcl_head = info;
      table->sequences = seq;
      table->num_sequences++;
    }
  else if (new_line_sorts_after (info, seq->last_line))
    {
      /* Normal case: add 'info' to the beginning of the current sequence.  */
      info->prev_line = seq->last_line;
      seq->last_line = info;

      /* lcl_head: initialize to head a *possible* sequence at the end.  */
      if (!table->lcl_head)
	table->lcl_head = info;
    }
  else if (!new_line_sorts_after (info, table->lcl_head)
	   && (!table->lcl_head->prev_line
	       || new_line_sorts_after (info, table->lcl_head->prev_line)))
    {
      /* Abnormal but easy: lcl_head is the head of 'info'.  */
      info->prev_line = table->lcl_head->prev_line;
      table->lcl_head->prev_line = info;
    }
  else
    {
      /* Abnormal and hard: Neither 'last_line' nor 'lcl_head'
	 are valid heads for 'info'.  Reset 'lcl_head'.  */
      struct line_info* li2 = seq->last_line; /* Always non-NULL.  */
      struct line_info* li1 = li2->prev_line;

      while (li1)
	{
	  if (!new_line_sorts_after (info, li2)
	      && new_line_sorts_after (info, li1))
	    break;

	  li2 = li1; /* always non-NULL */
	  li1 = li1->prev_line;
	}
      table->lcl_head = li2;
      info->prev_line = table->lcl_head->prev_line;
      table->lcl_head->prev_line = info;
      if (address < seq->low_pc)
	seq->low_pc = address;
    }
  return TRUE;
}

/* Extract a fully qualified filename from a line info table.
   The returned string has been malloc'ed and it is the caller's
   responsibility to free it.  */

static char *
concat_filename (struct line_info_table *table, unsigned int file)
{
  char *filename;

  if (file - 1 >= table->num_files)
    {
      /* FILE == 0 means unknown.  */
      if (file)
	_bfd_error_handler
	  (_("Dwarf Error: mangled line number section (bad file number)."));
      return strdup ("<unknown>");
    }

  filename = table->files[file - 1].name;

  if (!IS_ABSOLUTE_PATH (filename))
    {
      char *dir_name = NULL;
      char *subdir_name = NULL;
      char *name;
      size_t len;

      if (table->files[file - 1].dir
	  /* PR 17512: file: 0317e960.  */
	  && table->files[file - 1].dir <= table->num_dirs
	  /* PR 17512: file: 7f3d2e4b.  */
	  && table->dirs != NULL)
	subdir_name = table->dirs[table->files[file - 1].dir - 1];

      if (!subdir_name || !IS_ABSOLUTE_PATH (subdir_name))
	dir_name = table->comp_dir;

      if (!dir_name)
	{
	  dir_name = subdir_name;
	  subdir_name = NULL;
	}

      if (!dir_name)
	return strdup (filename);

      len = strlen (dir_name) + strlen (filename) + 2;

      if (subdir_name)
	{
	  len += strlen (subdir_name) + 1;
	  name = (char *) bfd_malloc (len);
	  if (name)
	    sprintf (name, "%s/%s/%s", dir_name, subdir_name, filename);
	}
      else
	{
	  name = (char *) bfd_malloc (len);
	  if (name)
	    sprintf (name, "%s/%s", dir_name, filename);
	}

      return name;
    }

  return strdup (filename);
}

static bfd_boolean
arange_add (const struct comp_unit *unit, struct arange *first_arange,
	    bfd_vma low_pc, bfd_vma high_pc)
{
  struct arange *arange;

  /* Ignore empty ranges.  */
  if (low_pc == high_pc)
    return TRUE;

  /* If the first arange is empty, use it.  */
  if (first_arange->high == 0)
    {
      first_arange->low = low_pc;
      first_arange->high = high_pc;
      return TRUE;
    }

  /* Next see if we can cheaply extend an existing range.  */
  arange = first_arange;
  do
    {
      if (low_pc == arange->high)
	{
	  arange->high = high_pc;
	  return TRUE;
	}
      if (high_pc == arange->low)
	{
	  arange->low = low_pc;
	  return TRUE;
	}
      arange = arange->next;
    }
  while (arange);

  /* Need to allocate a new arange and insert it into the arange list.
     Order isn't significant, so just insert after the first arange.  */
  arange = (struct arange *) bfd_alloc (unit->abfd, sizeof (*arange));
  if (arange == NULL)
    return FALSE;
  arange->low = low_pc;
  arange->high = high_pc;
  arange->next = first_arange->next;
  first_arange->next = arange;
  return TRUE;
}

/* Compare function for line sequences.  */

static int
compare_sequences (const void* a, const void* b)
{
  const struct line_sequence* seq1 = a;
  const struct line_sequence* seq2 = b;

  /* Sort by low_pc as the primary key.  */
  if (seq1->low_pc < seq2->low_pc)
    return -1;
  if (seq1->low_pc > seq2->low_pc)
    return 1;

  /* If low_pc values are equal, sort in reverse order of
     high_pc, so that the largest region comes first.  */
  if (seq1->last_line->address < seq2->last_line->address)
    return 1;
  if (seq1->last_line->address > seq2->last_line->address)
    return -1;

  if (seq1->last_line->op_index < seq2->last_line->op_index)
    return 1;
  if (seq1->last_line->op_index > seq2->last_line->op_index)
    return -1;

  return 0;
}

/* Construct the line information table for quick lookup.  */

static bfd_boolean
build_line_info_table (struct line_info_table *  table,
		       struct line_sequence *    seq)
{
  bfd_size_type      amt;
  struct line_info** line_info_lookup;
  struct line_info*  each_line;
  unsigned int       num_lines;
  unsigned int       line_index;

  if (seq->line_info_lookup != NULL)
    return TRUE;

  /* Count the number of line information entries.  We could do this while
     scanning the debug information, but some entries may be added via
     lcl_head without having a sequence handy to increment the number of
     lines.  */
  num_lines = 0;
  for (each_line = seq->last_line; each_line; each_line = each_line->prev_line)
    num_lines++;

  if (num_lines == 0)
    return TRUE;

  /* Allocate space for the line information lookup table.  */
  amt = sizeof (struct line_info*) * num_lines;
  line_info_lookup = (struct line_info**) bfd_alloc (table->abfd, amt);
  if (line_info_lookup == NULL)
    return FALSE;

  /* Create the line information lookup table.  */
  line_index = num_lines;
  for (each_line = seq->last_line; each_line; each_line = each_line->prev_line)
    line_info_lookup[--line_index] = each_line;

  BFD_ASSERT (line_index == 0);

  seq->num_lines = num_lines;
  seq->line_info_lookup = line_info_lookup;

  return TRUE;
}

/* Sort the line sequences for quick lookup.  */

static bfd_boolean
sort_line_sequences (struct line_info_table* table)
{
  bfd_size_type          amt;
  struct line_sequence*  sequences;
  struct line_sequence*  seq;
  unsigned int           n = 0;
  unsigned int           num_sequences = table->num_sequences;
  bfd_vma                last_high_pc;

  if (num_sequences == 0)
    return TRUE;

  /* Allocate space for an array of sequences.  */
  amt = sizeof (struct line_sequence) * num_sequences;
  sequences = (struct line_sequence *) bfd_alloc (table->abfd, amt);
  if (sequences == NULL)
    return FALSE;

  /* Copy the linked list into the array, freeing the original nodes.  */
  seq = table->sequences;
  for (n = 0; n < num_sequences; n++)
    {
      struct line_sequence* last_seq = seq;

      BFD_ASSERT (seq);
      sequences[n].low_pc = seq->low_pc;
      sequences[n].prev_sequence = NULL;
      sequences[n].last_line = seq->last_line;
      sequences[n].line_info_lookup = NULL;
      sequences[n].num_lines = 0;
      seq = seq->prev_sequence;
      free (last_seq);
    }
  BFD_ASSERT (seq == NULL);

  qsort (sequences, n, sizeof (struct line_sequence), compare_sequences);

  /* Make the list binary-searchable by trimming overlapping entries
     and removing nested entries.  */
  num_sequences = 1;
  last_high_pc = sequences[0].last_line->address;
  for (n = 1; n < table->num_sequences; n++)
    {
      if (sequences[n].low_pc < last_high_pc)
	{
	  if (sequences[n].last_line->address <= last_high_pc)
	    /* Skip nested entries.  */
	    continue;

	  /* Trim overlapping entries.  */
	  sequences[n].low_pc = last_high_pc;
	}
      last_high_pc = sequences[n].last_line->address;
      if (n > num_sequences)
	{
	  /* Close up the gap.  */
	  sequences[num_sequences].low_pc = sequences[n].low_pc;
	  sequences[num_sequences].last_line = sequences[n].last_line;
	}
      num_sequences++;
    }

  table->sequences = sequences;
  table->num_sequences = num_sequences;
  return TRUE;
}

/* Add directory to TABLE.  CUR_DIR memory ownership is taken by TABLE.  */

static bfd_boolean
line_info_add_include_dir (struct line_info_table *table, char *cur_dir)
{
  if ((table->num_dirs % DIR_ALLOC_CHUNK) == 0)
    {
      char **tmp;
      bfd_size_type amt;

      amt = table->num_dirs + DIR_ALLOC_CHUNK;
      amt *= sizeof (char *);

      tmp = (char **) bfd_realloc (table->dirs, amt);
      if (tmp == NULL)
	return FALSE;
      table->dirs = tmp;
    }

  table->dirs[table->num_dirs++] = cur_dir;
  return TRUE;
}

static bfd_boolean
line_info_add_include_dir_stub (struct line_info_table *table, char *cur_dir,
				unsigned int dir ATTRIBUTE_UNUSED,
				unsigned int xtime ATTRIBUTE_UNUSED,
				unsigned int size ATTRIBUTE_UNUSED)
{
  return line_info_add_include_dir (table, cur_dir);
}

/* Add file to TABLE.  CUR_FILE memory ownership is taken by TABLE.  */

static bfd_boolean
line_info_add_file_name (struct line_info_table *table, char *cur_file,
			 unsigned int dir, unsigned int xtime,
			 unsigned int size)
{
  if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
    {
      struct fileinfo *tmp;
      bfd_size_type amt;

      amt = table->num_files + FILE_ALLOC_CHUNK;
      amt *= sizeof (struct fileinfo);

      tmp = (struct fileinfo *) bfd_realloc (table->files, amt);
      if (tmp == NULL)
	return FALSE;
      table->files = tmp;
    }

  table->files[table->num_files].name = cur_file;
  table->files[table->num_files].dir = dir;
  table->files[table->num_files].time = xtime;
  table->files[table->num_files].size = size;
  table->num_files++;
  return TRUE;
}

/* Read directory or file name entry format, starting with byte of
   format count entries, ULEB128 pairs of entry formats, ULEB128 of
   entries count and the entries themselves in the described entry
   format.  */

static bfd_boolean
read_formatted_entries (struct comp_unit *unit, bfd_byte **bufp,
			bfd_byte *buf_end, struct line_info_table *table,
			bfd_boolean (*callback) (struct line_info_table *table,
						 char *cur_file,
						 unsigned int dir,
						 unsigned int time,
						 unsigned int size))
{
  bfd *abfd = unit->abfd;
  bfd_byte format_count, formati;
  bfd_vma data_count, datai;
  bfd_byte *buf = *bufp;
  bfd_byte *format_header_data;
  unsigned int bytes_read;

  format_count = read_1_byte (abfd, buf, buf_end);
  buf += 1;
  format_header_data = buf;
  for (formati = 0; formati < format_count; formati++)
    {
      _bfd_safe_read_leb128 (abfd, buf, &bytes_read, FALSE, buf_end);
      buf += bytes_read;
      _bfd_safe_read_leb128 (abfd, buf, &bytes_read, FALSE, buf_end);
      buf += bytes_read;
    }

  data_count = _bfd_safe_read_leb128 (abfd, buf, &bytes_read, FALSE, buf_end);
  buf += bytes_read;
  for (datai = 0; datai < data_count; datai++)
    {
      bfd_byte *format = format_header_data;
      struct fileinfo fe;

      for (formati = 0; formati < format_count; formati++)
	{
	  bfd_vma content_type, form;
	  char *string_trash;
	  char **stringp = &string_trash;
	  unsigned int uint_trash, *uintp = &uint_trash;

	  content_type = _bfd_safe_read_leb128 (abfd, format, &bytes_read,
						FALSE, buf_end);
	  format += bytes_read;
	  switch (content_type)
	    {
	    case DW_LNCT_path:
	      stringp = &fe.name;
	      break;
	    case DW_LNCT_directory_index:
	      uintp = &fe.dir;
	      break;
	    case DW_LNCT_timestamp:
	      uintp = &fe.time;
	      break;
	    case DW_LNCT_size:
	      uintp = &fe.size;
	      break;
	    case DW_LNCT_MD5:
	      break;
	    default:
	      _bfd_error_handler
		(_("Dwarf Error: Unknown format content type %Lu."),
		 content_type);
	      bfd_set_error (bfd_error_bad_value);
	      return FALSE;
	    }

	  form = _bfd_safe_read_leb128 (abfd, format, &bytes_read, FALSE,
					buf_end);
	  format += bytes_read;
	  switch (form)
	    {
	    case DW_FORM_string:
	      *stringp = read_string (abfd, buf, buf_end, &bytes_read);
	      buf += bytes_read;
	      break;

	    case DW_FORM_line_strp:
	      *stringp = read_indirect_line_string (unit, buf, buf_end, &bytes_read);
	      buf += bytes_read;
	      break;

	    case DW_FORM_data1:
	      *uintp = read_1_byte (abfd, buf, buf_end);
	      buf += 1;
	      break;

	    case DW_FORM_data2:
	      *uintp = read_2_bytes (abfd, buf, buf_end);
	      buf += 2;
	      break;

	    case DW_FORM_data4:
	      *uintp = read_4_bytes (abfd, buf, buf_end);
	      buf += 4;
	      break;

	    case DW_FORM_data8:
	      *uintp = read_8_bytes (abfd, buf, buf_end);
	      buf += 8;
	      break;

	    case DW_FORM_udata:
	      *uintp = _bfd_safe_read_leb128 (abfd, buf, &bytes_read, FALSE,
					      buf_end);
	      buf += bytes_read;
	      break;

	    case DW_FORM_block:
	      /* It is valid only for DW_LNCT_timestamp which is ignored by
		 current GDB.  */
	      break;
	    }
	}

      if (!callback (table, fe.name, fe.dir, fe.time, fe.size))
	return FALSE;
    }

  *bufp = buf;
  return TRUE;
}

/* Decode the line number information for UNIT.  */

static struct line_info_table*
decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
{
  bfd *abfd = unit->abfd;
  struct line_info_table* table;
  bfd_byte *line_ptr;
  bfd_byte *line_end;
  struct line_head lh;
  unsigned int i, bytes_read, offset_size;
  char *cur_file, *cur_dir;
  unsigned char op_code, extended_op, adj_opcode;
  unsigned int exop_len;
  bfd_size_type amt;

  if (! read_section (abfd, &stash->debug_sections[debug_line],
		      stash->syms, unit->line_offset,
		      &stash->dwarf_line_buffer, &stash->dwarf_line_size))
    return NULL;

  amt = sizeof (struct line_info_table);
  table = (struct line_info_table *) bfd_alloc (abfd, amt);
  if (table == NULL)
    return NULL;
  table->abfd = abfd;
  table->comp_dir = unit->comp_dir;

  table->num_files = 0;
  table->files = NULL;

  table->num_dirs = 0;
  table->dirs = NULL;

  table->num_sequences = 0;
  table->sequences = NULL;

  table->lcl_head = NULL;

  if (stash->dwarf_line_size < 16)
    {
      _bfd_error_handler
	(_("Dwarf Error: Line info section is too small (%Ld)"),
	 stash->dwarf_line_size);
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }
  line_ptr = stash->dwarf_line_buffer + unit->line_offset;
  line_end = stash->dwarf_line_buffer + stash->dwarf_line_size;

  /* Read in the prologue.  */
  lh.total_length = read_4_bytes (abfd, line_ptr, line_end);
  line_ptr += 4;
  offset_size = 4;
  if (lh.total_length == 0xffffffff)
    {
      lh.total_length = read_8_bytes (abfd, line_ptr, line_end);
      line_ptr += 8;
      offset_size = 8;
    }
  else if (lh.total_length == 0 && unit->addr_size == 8)
    {
      /* Handle (non-standard) 64-bit DWARF2 formats.  */
      lh.total_length = read_4_bytes (abfd, line_ptr, line_end);
      line_ptr += 4;
      offset_size = 8;
    }

  if (unit->line_offset + lh.total_length > stash->dwarf_line_size)
    {
      _bfd_error_handler
	/* xgettext: c-format */
	(_("Dwarf Error: Line info data is bigger (%#Lx) than the space remaining in the section (%#Lx)"),
	 lh.total_length, stash->dwarf_line_size - unit->line_offset);
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  line_end = line_ptr + lh.total_length;

  lh.version = read_2_bytes (abfd, line_ptr, line_end);
  if (lh.version < 2 || lh.version > 5)
    {
      _bfd_error_handler
	(_("Dwarf Error: Unhandled .debug_line version %d."), lh.version);
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }
  line_ptr += 2;

  if (line_ptr + offset_size + (lh.version >= 5 ? 8 : (lh.version >= 4 ? 6 : 5))
      >= line_end)
    {
      _bfd_error_handler
	(_("Dwarf Error: Ran out of room reading prologue"));
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  if (lh.version >= 5)
    {
      unsigned int segment_selector_size;

      /* Skip address size.  */
      read_1_byte (abfd, line_ptr, line_end);
      line_ptr += 1;

      segment_selector_size = read_1_byte (abfd, line_ptr, line_end);
      line_ptr += 1;
      if (segment_selector_size != 0)
	{
	  _bfd_error_handler
	    (_("Dwarf Error: Line info unsupported segment selector size %u."),
	     segment_selector_size);
	  bfd_set_error (bfd_error_bad_value);
	  return NULL;
	}
    }

  if (offset_size == 4)
    lh.prologue_length = read_4_bytes (abfd, line_ptr, line_end);
  else
    lh.prologue_length = read_8_bytes (abfd, line_ptr, line_end);
  line_ptr += offset_size;

  lh.minimum_instruction_length = read_1_byte (abfd, line_ptr, line_end);
  line_ptr += 1;

  if (lh.version >= 4)
    {
      lh.maximum_ops_per_insn = read_1_byte (abfd, line_ptr, line_end);
      line_ptr += 1;
    }
  else
    lh.maximum_ops_per_insn = 1;

  if (lh.maximum_ops_per_insn == 0)
    {
      _bfd_error_handler
	(_("Dwarf Error: Invalid maximum operations per instruction."));
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  lh.default_is_stmt = read_1_byte (abfd, line_ptr, line_end);
  line_ptr += 1;

  lh.line_base = read_1_signed_byte (abfd, line_ptr, line_end);
  line_ptr += 1;

  lh.line_range = read_1_byte (abfd, line_ptr, line_end);
  line_ptr += 1;

  lh.opcode_base = read_1_byte (abfd, line_ptr, line_end);
  line_ptr += 1;

  if (line_ptr + (lh.opcode_base - 1) >= line_end)
    {
      _bfd_error_handler (_("Dwarf Error: Ran out of room reading opcodes"));
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  amt = lh.opcode_base * sizeof (unsigned char);
  lh.standard_opcode_lengths = (unsigned char *) bfd_alloc (abfd, amt);

  lh.standard_opcode_lengths[0] = 1;

  for (i = 1; i < lh.opcode_base; ++i)
    {
      lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr, line_end);
      line_ptr += 1;
    }

  if (lh.version >= 5)
    {
      /* Read directory table.  */
      if (!read_formatted_entries (unit, &line_ptr, line_end, table,
				   line_info_add_include_dir_stub))
	goto fail;

      /* Read file name table.  */
      if (!read_formatted_entries (unit, &line_ptr, line_end, table,
				   line_info_add_file_name))
	goto fail;
    }
  else
    {
      /* Read directory table.  */
      while ((cur_dir = read_string (abfd, line_ptr, line_end, &bytes_read)) != NULL)
	{
	  line_ptr += bytes_read;

	  if (!line_info_add_include_dir (table, cur_dir))
	    goto fail;
	}

      line_ptr += bytes_read;

      /* Read file name table.  */
      while ((cur_file = read_string (abfd, line_ptr, line_end, &bytes_read)) != NULL)
	{
	  unsigned int dir, xtime, size;

	  line_ptr += bytes_read;

	  dir = _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
	  line_ptr += bytes_read;
	  xtime = _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
	  line_ptr += bytes_read;
	  size = _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
	  line_ptr += bytes_read;

	  if (!line_info_add_file_name (table, cur_file, dir, xtime, size))
	    goto fail;
	}

      line_ptr += bytes_read;
    }

  /* Read the statement sequences until there's nothing left.  */
  while (line_ptr < line_end)
    {
      /* State machine registers.  */
      bfd_vma address = 0;
      unsigned char op_index = 0;
      char * filename = table->num_files ? concat_filename (table, 1) : NULL;
      unsigned int line = 1;
      unsigned int column = 0;
      unsigned int discriminator = 0;
      int is_stmt = lh.default_is_stmt;
      int end_sequence = 0;
      /* eraxxon@alumni.rice.edu: Against the DWARF2 specs, some
	 compilers generate address sequences that are wildly out of
	 order using DW_LNE_set_address (e.g. Intel C++ 6.0 compiler
	 for ia64-Linux).  Thus, to determine the low and high
	 address, we must compare on every DW_LNS_copy, etc.  */
      bfd_vma low_pc  = (bfd_vma) -1;
      bfd_vma high_pc = 0;

      /* Decode the table.  */
      while (! end_sequence)
	{
	  op_code = read_1_byte (abfd, line_ptr, line_end);
	  line_ptr += 1;

	  if (op_code >= lh.opcode_base)
	    {
	      /* Special operand.  */
	      adj_opcode = op_code - lh.opcode_base;
	      if (lh.line_range == 0)
		goto line_fail;
	      if (lh.maximum_ops_per_insn == 1)
		address += (adj_opcode / lh.line_range
			    * lh.minimum_instruction_length);
	      else
		{
		  address += ((op_index + adj_opcode / lh.line_range)
			      / lh.maximum_ops_per_insn
			      * lh.minimum_instruction_length);
		  op_index = ((op_index + adj_opcode / lh.line_range)
			      % lh.maximum_ops_per_insn);
		}
	      line += lh.line_base + (adj_opcode % lh.line_range);
	      /* Append row to matrix using current values.  */
	      if (!add_line_info (table, address, op_index, filename,
				  line, column, discriminator, 0))
		goto line_fail;
	      discriminator = 0;
	      if (address < low_pc)
		low_pc = address;
	      if (address > high_pc)
		high_pc = address;
	    }
	  else switch (op_code)
	    {
	    case DW_LNS_extended_op:
	      exop_len = _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
						FALSE, line_end);
	      line_ptr += bytes_read;
	      extended_op = read_1_byte (abfd, line_ptr, line_end);
	      line_ptr += 1;

	      switch (extended_op)
		{
		case DW_LNE_end_sequence:
		  end_sequence = 1;
		  if (!add_line_info (table, address, op_index, filename, line,
				      column, discriminator, end_sequence))
		    goto line_fail;
		  discriminator = 0;
		  if (address < low_pc)
		    low_pc = address;
		  if (address > high_pc)
		    high_pc = address;
		  if (!arange_add (unit, &unit->arange, low_pc, high_pc))
		    goto line_fail;
		  break;
		case DW_LNE_set_address:
		  address = read_address (unit, line_ptr, line_end);
		  op_index = 0;
		  line_ptr += unit->addr_size;
		  break;
		case DW_LNE_define_file:
		  cur_file = read_string (abfd, line_ptr, line_end, &bytes_read);
		  line_ptr += bytes_read;
		  if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
		    {
		      struct fileinfo *tmp;

		      amt = table->num_files + FILE_ALLOC_CHUNK;
		      amt *= sizeof (struct fileinfo);
		      tmp = (struct fileinfo *) bfd_realloc (table->files, amt);
		      if (tmp == NULL)
			goto line_fail;
		      table->files = tmp;
		    }
		  table->files[table->num_files].name = cur_file;
		  table->files[table->num_files].dir =
		    _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					   FALSE, line_end);
		  line_ptr += bytes_read;
		  table->files[table->num_files].time =
		    _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					   FALSE, line_end);
		  line_ptr += bytes_read;
		  table->files[table->num_files].size =
		    _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					   FALSE, line_end);
		  line_ptr += bytes_read;
		  table->num_files++;
		  break;
		case DW_LNE_set_discriminator:
		  discriminator =
		    _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					   FALSE, line_end);
		  line_ptr += bytes_read;
		  break;
		case DW_LNE_HP_source_file_correlation:
		  line_ptr += exop_len - 1;
		  break;
		default:
		  _bfd_error_handler
		    (_("Dwarf Error: mangled line number section."));
		  bfd_set_error (bfd_error_bad_value);
		line_fail:
		  if (filename != NULL)
		    free (filename);
		  goto fail;
		}
	      break;
	    case DW_LNS_copy:
	      if (!add_line_info (table, address, op_index,
				  filename, line, column, discriminator, 0))
		goto line_fail;
	      discriminator = 0;
	      if (address < low_pc)
		low_pc = address;
	      if (address > high_pc)
		high_pc = address;
	      break;
	    case DW_LNS_advance_pc:
	      if (lh.maximum_ops_per_insn == 1)
		address += (lh.minimum_instruction_length
			    * _bfd_safe_read_leb128 (abfd, line_ptr,
						     &bytes_read,
						     FALSE, line_end));
	      else
		{
		  bfd_vma adjust = _bfd_safe_read_leb128 (abfd, line_ptr,
							  &bytes_read,
							  FALSE, line_end);
		  address = ((op_index + adjust) / lh.maximum_ops_per_insn
			     * lh.minimum_instruction_length);
		  op_index = (op_index + adjust) % lh.maximum_ops_per_insn;
		}
	      line_ptr += bytes_read;
	      break;
	    case DW_LNS_advance_line:
	      line += _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					     TRUE, line_end);
	      line_ptr += bytes_read;
	      break;
	    case DW_LNS_set_file:
	      {
		unsigned int file;

		/* The file and directory tables are 0
		   based, the references are 1 based.  */
		file = _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					      FALSE, line_end);
		line_ptr += bytes_read;
		if (filename)
		  free (filename);
		filename = concat_filename (table, file);
		break;
	      }
	    case DW_LNS_set_column:
	      column = _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
					      FALSE, line_end);
	      line_ptr += bytes_read;
	      break;
	    case DW_LNS_negate_stmt:
	      is_stmt = (!is_stmt);
	      break;
	    case DW_LNS_set_basic_block:
	      break;
	    case DW_LNS_const_add_pc:
	      if (lh.maximum_ops_per_insn == 1)
		address += (lh.minimum_instruction_length
			    * ((255 - lh.opcode_base) / lh.line_range));
	      else
		{
		  bfd_vma adjust = ((255 - lh.opcode_base) / lh.line_range);
		  address += (lh.minimum_instruction_length
			      * ((op_index + adjust)
				 / lh.maximum_ops_per_insn));
		  op_index = (op_index + adjust) % lh.maximum_ops_per_insn;
		}
	      break;
	    case DW_LNS_fixed_advance_pc:
	      address += read_2_bytes (abfd, line_ptr, line_end);
	      op_index = 0;
	      line_ptr += 2;
	      break;
	    default:
	      /* Unknown standard opcode, ignore it.  */
	      for (i = 0; i < lh.standard_opcode_lengths[op_code]; i++)
		{
		  (void) _bfd_safe_read_leb128 (abfd, line_ptr, &bytes_read,
						FALSE, line_end);
		  line_ptr += bytes_read;
		}
	      break;
	    }
	}

      if (filename)
	free (filename);
    }

  if (sort_line_sequences (table))
    return table;

 fail:
  if (table->sequences != NULL)
    free (table->sequences);
  if (table->files != NULL)
    free (table->files);
  if (table->dirs != NULL)
    free (table->dirs);
  return NULL;
}

/* If ADDR is within TABLE set the output parameters and return the
   range of addresses covered by the entry used to fill them out.
   Otherwise set * FILENAME_PTR to NULL and return 0.
   The parameters FILENAME_PTR, LINENUMBER_PTR and DISCRIMINATOR_PTR
   are pointers to the objects to be filled in.  */

static bfd_vma
lookup_address_in_line_info_table (struct line_info_table *table,
				   bfd_vma addr,
				   const char **filename_ptr,
				   unsigned int *linenumber_ptr,
				   unsigned int *discriminator_ptr)
{
  struct line_sequence *seq = NULL;
  struct line_info *info;
  int low, high, mid;

  /* Binary search the array of sequences.  */
  low = 0;
  high = table->num_sequences;
  while (low < high)
    {
      mid = (low + high) / 2;
      seq = &table->sequences[mid];
      if (addr < seq->low_pc)
	high = mid;
      else if (addr >= seq->last_line->address)
	low = mid + 1;
      else
	break;
    }

  /* Check for a valid sequence.  */
  if (!seq || addr < seq->low_pc || addr >= seq->last_line->address)
    goto fail;

  if (!build_line_info_table (table, seq))
    goto fail;

  /* Binary search the array of line information.  */
  low = 0;
  high = seq->num_lines;
  info = NULL;
  while (low < high)
    {
      mid = (low + high) / 2;
      info = seq->line_info_lookup[mid];
      if (addr < info->address)
	high = mid;
      else if (addr >= seq->line_info_lookup[mid + 1]->address)
	low = mid + 1;
      else
	break;
    }

  /* Check for a valid line information entry.  */
  if (info
      && addr >= info->address
      && addr < seq->line_info_lookup[mid + 1]->address
      && !(info->end_sequence || info == seq->last_line))
    {
      *filename_ptr = info->filename;
      *linenumber_ptr = info->line;
      if (discriminator_ptr)
	*discriminator_ptr = info->discriminator;
      return seq->last_line->address - seq->low_pc;
    }

fail:
  *filename_ptr = NULL;
  return 0;
}

/* Read in the .debug_ranges section for future reference.  */

static bfd_boolean
read_debug_ranges (struct comp_unit * unit)
{
  struct dwarf2_debug * stash = unit->stash;

  return read_section (unit->abfd, &stash->debug_sections[debug_ranges],
		       stash->syms, 0,
		       &stash->dwarf_ranges_buffer,
		       &stash->dwarf_ranges_size);
}

/* Function table functions.  */

static int
compare_lookup_funcinfos (const void * a, const void * b)
{
  const struct lookup_funcinfo * lookup1 = a;
  const struct lookup_funcinfo * lookup2 = b;

  if (lookup1->low_addr < lookup2->low_addr)
    return -1;
  if (lookup1->low_addr > lookup2->low_addr)
    return 1;
  if (lookup1->high_addr < lookup2->high_addr)
    return -1;
  if (lookup1->high_addr > lookup2->high_addr)
    return 1;

  return 0;
}

static bfd_boolean
build_lookup_funcinfo_table (struct comp_unit * unit)
{
  struct lookup_funcinfo *lookup_funcinfo_table = unit->lookup_funcinfo_table;
  unsigned int number_of_functions = unit->number_of_functions;
  struct funcinfo *each;
  struct lookup_funcinfo *entry;
  size_t func_index;
  struct arange *range;
  bfd_vma low_addr, high_addr;

  if (lookup_funcinfo_table || number_of_functions == 0)
    return TRUE;

  /* Create the function info lookup table.  */
  lookup_funcinfo_table = (struct lookup_funcinfo *)
    bfd_malloc (number_of_functions * sizeof (struct lookup_funcinfo));
  if (lookup_funcinfo_table == NULL)
    return FALSE;

  /* Populate the function info lookup table.  */
  func_index = number_of_functions;
  for (each = unit->function_table; each; each = each->prev_func)
    {
      entry = &lookup_funcinfo_table[--func_index];
      entry->funcinfo = each;

      /* Calculate the lowest and highest address for this function entry.  */
      low_addr  = entry->funcinfo->arange.low;
      high_addr = entry->funcinfo->arange.high;

      for (range = entry->funcinfo->arange.next; range; range = range->next)
	{
	  if (range->low < low_addr)
	    low_addr = range->low;
	  if (range->high > high_addr)
	    high_addr = range->high;
	}

      entry->low_addr = low_addr;
      entry->high_addr = high_addr;
    }

  BFD_ASSERT (func_index == 0);

  /* Sort the function by address.  */
  qsort (lookup_funcinfo_table,
	 number_of_functions,
	 sizeof (struct lookup_funcinfo),
	 compare_lookup_funcinfos);

  /* Calculate the high watermark for each function in the lookup table.  */
  high_addr = lookup_funcinfo_table[0].high_addr;
  for (func_index = 1; func_index < number_of_functions; func_index++)
    {
      entry = &lookup_funcinfo_table[func_index];
      if (entry->high_addr > high_addr)
	high_addr = entry->high_addr;
      else
	entry->high_addr = high_addr;
    }

  unit->lookup_funcinfo_table = lookup_funcinfo_table;
  return TRUE;
}

/* If ADDR is within UNIT's function tables, set FUNCTION_PTR, and return
   TRUE.  Note that we need to find the function that has the smallest range
   that contains ADDR, to handle inlined functions without depending upon
   them being ordered in TABLE by increasing range.  */

static bfd_boolean
lookup_address_in_function_table (struct comp_unit *unit,
				  bfd_vma addr,
				  struct funcinfo **function_ptr)
{
  unsigned int number_of_functions = unit->number_of_functions;
  struct lookup_funcinfo* lookup_funcinfo = NULL;
  struct funcinfo* funcinfo = NULL;
  struct funcinfo* best_fit = NULL;
  bfd_vma best_fit_len = 0;
  bfd_size_type low, high, mid, first;
  struct arange *arange;

  if (number_of_functions == 0)
    return FALSE;

  if (!build_lookup_funcinfo_table (unit))
    return FALSE;

  if (unit->lookup_funcinfo_table[number_of_functions - 1].high_addr < addr)
    return FALSE;
  
  /* Find the first function in the lookup table which may contain the
     specified address.  */
  low = 0;
  high = number_of_functions;
  first = high;
  while (low < high)
    {
      mid = (low + high) / 2;
      lookup_funcinfo = &unit->lookup_funcinfo_table[mid];
      if (addr < lookup_funcinfo->low_addr)
	high = mid;
      else if (addr >= lookup_funcinfo->high_addr)
	low = mid + 1;
      else
	high = first = mid;
    }

  /* Find the 'best' match for the address.  The prior algorithm defined the
     best match as the function with the smallest address range containing
     the specified address.  This definition should probably be changed to the
     innermost inline routine containing the address, but right now we want
     to get the same results we did before.  */
  while (first < number_of_functions)
    {
      if (addr < unit->lookup_funcinfo_table[first].low_addr)
	break;
      funcinfo = unit->lookup_funcinfo_table[first].funcinfo;

      for (arange = &funcinfo->arange; arange; arange = arange->next)
	{
	  if (addr < arange->low || addr >= arange->high)
	    continue;

	  if (!best_fit
	      || arange->high - arange->low < best_fit_len
	      /* The following comparison is designed to return the same
		 match as the previous algorithm for routines which have the
		 same best fit length.  */
	      || (arange->high - arange->low == best_fit_len
		  && funcinfo > best_fit))
	    {
	      best_fit = funcinfo;
	      best_fit_len = arange->high - arange->low;
	    }
	}

      first++;
    }

  if (!best_fit)
    return FALSE;

  *function_ptr = best_fit;
  return TRUE;
}

/* If SYM at ADDR is within function table of UNIT, set FILENAME_PTR
   and LINENUMBER_PTR, and return TRUE.  */

static bfd_boolean
lookup_symbol_in_function_table (struct comp_unit *unit,
				 asymbol *sym,
				 bfd_vma addr,
				 const char **filename_ptr,
				 unsigned int *linenumber_ptr)
{
  struct funcinfo* each_func;
  struct funcinfo* best_fit = NULL;
  bfd_vma best_fit_len = 0;
  struct arange *arange;
  const char *name = bfd_asymbol_name (sym);
  asection *sec = bfd_get_section (sym);

  for (each_func = unit->function_table;
       each_func;
       each_func = each_func->prev_func)
    {
      for (arange = &each_func->arange;
	   arange;
	   arange = arange->next)
	{
	  if ((!each_func->sec || each_func->sec == sec)
	      && addr >= arange->low
	      && addr < arange->high
	      && each_func->name
	      && strcmp (name, each_func->name) == 0
	      && (!best_fit
		  || arange->high - arange->low < best_fit_len))
	    {
	      best_fit = each_func;
	      best_fit_len = arange->high - arange->low;
	    }
	}
    }

  if (best_fit)
    {
      best_fit->sec = sec;
      *filename_ptr = best_fit->file;
      *linenumber_ptr = best_fit->line;
      return TRUE;
    }
  else
    return FALSE;
}

/* Variable table functions.  */

/* If SYM is within variable table of UNIT, set FILENAME_PTR and
   LINENUMBER_PTR, and return TRUE.  */

static bfd_boolean
lookup_symbol_in_variable_table (struct comp_unit *unit,
				 asymbol *sym,
				 bfd_vma addr,
				 const char **filename_ptr,
				 unsigned int *linenumber_ptr)
{
  const char *name = bfd_asymbol_name (sym);
  asection *sec = bfd_get_section (sym);
  struct varinfo* each;

  for (each = unit->variable_table; each; each = each->prev_var)
    if (each->stack == 0
	&& each->file != NULL
	&& each->name != NULL
	&& each->addr == addr
	&& (!each->sec || each->sec == sec)
	&& strcmp (name, each->name) == 0)
      break;

  if (each)
    {
      each->sec = sec;
      *filename_ptr = each->file;
      *linenumber_ptr = each->line;
      return TRUE;
    }

  return FALSE;
}

static char *
find_abstract_instance_name (struct comp_unit *unit,
			     struct attribute *attr_ptr,
			     bfd_boolean *is_linkage)
{
  bfd *abfd = unit->abfd;
  bfd_byte *info_ptr;
  bfd_byte *info_ptr_end;
  unsigned int abbrev_number, bytes_read, i;
  struct abbrev_info *abbrev;
  bfd_uint64_t die_ref = attr_ptr->u.val;
  struct attribute attr;
  char *name = NULL;

  /* DW_FORM_ref_addr can reference an entry in a different CU. It
     is an offset from the .debug_info section, not the current CU.  */
  if (attr_ptr->form == DW_FORM_ref_addr)
    {
      /* We only support DW_FORM_ref_addr within the same file, so
	 any relocations should be resolved already.  */
      if (!die_ref)
	abort ();

      info_ptr = unit->sec_info_ptr + die_ref;
      info_ptr_end = unit->end_ptr;

      /* Now find the CU containing this pointer.  */
      if (info_ptr >= unit->info_ptr_unit && info_ptr < unit->end_ptr)
	;
      else
	{
	  /* Check other CUs to see if they contain the abbrev.  */
	  struct comp_unit * u;

	  for (u = unit->prev_unit; u != NULL; u = u->prev_unit)
	    if (info_ptr >= u->info_ptr_unit && info_ptr < u->end_ptr)
	      break;

	  if (u == NULL)
	    for (u = unit->next_unit; u != NULL; u = u->next_unit)
	      if (info_ptr >= u->info_ptr_unit && info_ptr < u->end_ptr)
		break;

	  if (u)
	    unit = u;
	  /* else FIXME: What do we do now ?  */
	}
    }
  else if (attr_ptr->form == DW_FORM_GNU_ref_alt)
    {
      info_ptr = read_alt_indirect_ref (unit, die_ref);
      if (info_ptr == NULL)
	{
	  _bfd_error_handler
	    (_("Dwarf Error: Unable to read alt ref %llu."),
	     (long long) die_ref);
	  bfd_set_error (bfd_error_bad_value);
	  return NULL;
	}
      info_ptr_end = unit->stash->alt_dwarf_info_buffer + unit->stash->alt_dwarf_info_size;

      /* FIXME: Do we need to locate the correct CU, in a similar
	 fashion to the code in the DW_FORM_ref_addr case above ?  */
    }
  else
    {
      info_ptr = unit->info_ptr_unit + die_ref;
      info_ptr_end = unit->end_ptr;
    }

  abbrev_number = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					 FALSE, info_ptr_end);
  info_ptr += bytes_read;

  if (abbrev_number)
    {
      abbrev = lookup_abbrev (abbrev_number, unit->abbrevs);
      if (! abbrev)
	{
	  _bfd_error_handler
	    (_("Dwarf Error: Could not find abbrev number %u."), abbrev_number);
	  bfd_set_error (bfd_error_bad_value);
	}
      else
	{
	  for (i = 0; i < abbrev->num_attrs; ++i)
	    {
	      info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit,
					 info_ptr, info_ptr_end);
	      if (info_ptr == NULL)
		break;
	      switch (attr.name)
		{
		case DW_AT_name:
		  /* Prefer DW_AT_MIPS_linkage_name or DW_AT_linkage_name
		     over DW_AT_name.  */
		  if (name == NULL && is_str_attr (attr.form))
		    {
		      name = attr.u.str;
		      if (non_mangled (unit->lang))
			*is_linkage = TRUE;
		    }
		  break;
		case DW_AT_specification:
		  name = find_abstract_instance_name (unit, &attr, is_linkage);
		  break;
		case DW_AT_linkage_name:
		case DW_AT_MIPS_linkage_name:
		  /* PR 16949:  Corrupt debug info can place
		     non-string forms into these attributes.  */
		  if (is_str_attr (attr.form))
		    {
		      name = attr.u.str;
		      *is_linkage = TRUE;
		    }
		  break;
		default:
		  break;
		}
	    }
	}
    }
  return name;
}

static bfd_boolean
read_rangelist (struct comp_unit *unit, struct arange *arange,
		bfd_uint64_t offset)
{
  bfd_byte *ranges_ptr;
  bfd_byte *ranges_end;
  bfd_vma base_address = unit->base_address;

  if (! unit->stash->dwarf_ranges_buffer)
    {
      if (! read_debug_ranges (unit))
	return FALSE;
    }

  ranges_ptr = unit->stash->dwarf_ranges_buffer + offset;
  if (ranges_ptr < unit->stash->dwarf_ranges_buffer)
    return FALSE;
  ranges_end = unit->stash->dwarf_ranges_buffer + unit->stash->dwarf_ranges_size;

  for (;;)
    {
      bfd_vma low_pc;
      bfd_vma high_pc;

      /* PR 17512: file: 62cada7d.  */
      if (ranges_ptr + 2 * unit->addr_size > ranges_end)
	return FALSE;

      low_pc = read_address (unit, ranges_ptr, ranges_end);
      ranges_ptr += unit->addr_size;
      high_pc = read_address (unit, ranges_ptr, ranges_end);
      ranges_ptr += unit->addr_size;

      if (low_pc == 0 && high_pc == 0)
	break;
      if (low_pc == -1UL && high_pc != -1UL)
	base_address = high_pc;
      else
	{
	  if (!arange_add (unit, arange,
			   base_address + low_pc, base_address + high_pc))
	    return FALSE;
	}
    }
  return TRUE;
}

/* DWARF2 Compilation unit functions.  */

/* Scan over each die in a comp. unit looking for functions to add
   to the function table and variables to the variable table.  */

static bfd_boolean
scan_unit_for_symbols (struct comp_unit *unit)
{
  bfd *abfd = unit->abfd;
  bfd_byte *info_ptr = unit->first_child_die_ptr;
  bfd_byte *info_ptr_end = unit->stash->info_ptr_end;
  int nesting_level = 1;
  struct funcinfo **nested_funcs;
  int nested_funcs_size;

  /* Maintain a stack of in-scope functions and inlined functions, which we
     can use to set the caller_func field.  */
  nested_funcs_size = 32;
  nested_funcs = (struct funcinfo **)
    bfd_malloc (nested_funcs_size * sizeof (struct funcinfo *));
  if (nested_funcs == NULL)
    return FALSE;
  nested_funcs[nesting_level] = 0;

  while (nesting_level)
    {
      unsigned int abbrev_number, bytes_read, i;
      struct abbrev_info *abbrev;
      struct attribute attr;
      struct funcinfo *func;
      struct varinfo *var;
      bfd_vma low_pc = 0;
      bfd_vma high_pc = 0;
      bfd_boolean high_pc_relative = FALSE;

      /* PR 17512: file: 9f405d9d.  */
      if (info_ptr >= info_ptr_end)
	goto fail;

      abbrev_number = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					     FALSE, info_ptr_end);
      info_ptr += bytes_read;

      if (! abbrev_number)
	{
	  nesting_level--;
	  continue;
	}

      abbrev = lookup_abbrev (abbrev_number, unit->abbrevs);
      if (! abbrev)
	{
	  static unsigned int previous_failed_abbrev = -1U;

	  /* Avoid multiple reports of the same missing abbrev.  */
	  if (abbrev_number != previous_failed_abbrev)
	    {
	      _bfd_error_handler
		(_("Dwarf Error: Could not find abbrev number %u."),
		 abbrev_number);
	      previous_failed_abbrev = abbrev_number;
	    }
	  bfd_set_error (bfd_error_bad_value);
	  goto fail;
	}

      var = NULL;
      if (abbrev->tag == DW_TAG_subprogram
	  || abbrev->tag == DW_TAG_entry_point
	  || abbrev->tag == DW_TAG_inlined_subroutine)
	{
	  bfd_size_type amt = sizeof (struct funcinfo);
	  func = (struct funcinfo *) bfd_zalloc (abfd, amt);
	  if (func == NULL)
	    goto fail;
	  func->tag = abbrev->tag;
	  func->prev_func = unit->function_table;
	  unit->function_table = func;
	  unit->number_of_functions++;
	  BFD_ASSERT (!unit->cached);

	  if (func->tag == DW_TAG_inlined_subroutine)
	    for (i = nesting_level - 1; i >= 1; i--)
	      if (nested_funcs[i])
		{
		  func->caller_func = nested_funcs[i];
		  break;
		}
	  nested_funcs[nesting_level] = func;
	}
      else
	{
	  func = NULL;
	  if (abbrev->tag == DW_TAG_variable)
	    {
	      bfd_size_type amt = sizeof (struct varinfo);
	      var = (struct varinfo *) bfd_zalloc (abfd, amt);
	      if (var == NULL)
		goto fail;
	      var->tag = abbrev->tag;
	      var->stack = 1;
	      var->prev_var = unit->variable_table;
	      unit->variable_table = var;
	      /* PR 18205: Missing debug information can cause this
		 var to be attached to an already cached unit.  */
	    }

	  /* No inline function in scope at this nesting level.  */
	  nested_funcs[nesting_level] = 0;
	}

      for (i = 0; i < abbrev->num_attrs; ++i)
	{
	  info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr, info_ptr_end);
	  if (info_ptr == NULL)
	    goto fail;

	  if (func)
	    {
	      switch (attr.name)
		{
		case DW_AT_call_file:
		  func->caller_file = concat_filename (unit->line_table,
						       attr.u.val);
		  break;

		case DW_AT_call_line:
		  func->caller_line = attr.u.val;
		  break;

		case DW_AT_abstract_origin:
		case DW_AT_specification:
		  func->name = find_abstract_instance_name (unit, &attr,
							    &func->is_linkage);
		  break;

		case DW_AT_name:
		  /* Prefer DW_AT_MIPS_linkage_name or DW_AT_linkage_name
		     over DW_AT_name.  */
		  if (func->name == NULL && is_str_attr (attr.form))
		    {
		      func->name = attr.u.str;
		      if (non_mangled (unit->lang))
			func->is_linkage = TRUE;
		    }
		  break;

		case DW_AT_linkage_name:
		case DW_AT_MIPS_linkage_name:
		  /* PR 16949:  Corrupt debug info can place
		     non-string forms into these attributes.  */
		  if (is_str_attr (attr.form))
		    {
		      func->name = attr.u.str;
		      func->is_linkage = TRUE;
		    }
		  break;

		case DW_AT_low_pc:
		  low_pc = attr.u.val;
		  break;

		case DW_AT_high_pc:
		  high_pc = attr.u.val;
		  high_pc_relative = attr.form != DW_FORM_addr;
		  break;

		case DW_AT_ranges:
		  if (!read_rangelist (unit, &func->arange, attr.u.val))
		    goto fail;
		  break;

		case DW_AT_decl_file:
		  func->file = concat_filename (unit->line_table,
						attr.u.val);
		  break;

		case DW_AT_decl_line:
		  func->line = attr.u.val;
		  break;

		default:
		  break;
		}
	    }
	  else if (var)
	    {
	      switch (attr.name)
		{
		case DW_AT_name:
		  var->name = attr.u.str;
		  break;

		case DW_AT_decl_file:
		  var->file = concat_filename (unit->line_table,
					       attr.u.val);
		  break;

		case DW_AT_decl_line:
		  var->line = attr.u.val;
		  break;

		case DW_AT_external:
		  if (attr.u.val != 0)
		    var->stack = 0;
		  break;

		case DW_AT_location:
		  switch (attr.form)
		    {
		    case DW_FORM_block:
		    case DW_FORM_block1:
		    case DW_FORM_block2:
		    case DW_FORM_block4:
		    case DW_FORM_exprloc:
		      if (*attr.u.blk->data == DW_OP_addr)
			{
			  var->stack = 0;

			  /* Verify that DW_OP_addr is the only opcode in the
			     location, in which case the block size will be 1
			     plus the address size.  */
			  /* ??? For TLS variables, gcc can emit
			     DW_OP_addr <addr> DW_OP_GNU_push_tls_address
			     which we don't handle here yet.  */
			  if (attr.u.blk->size == unit->addr_size + 1U)
			    var->addr = bfd_get (unit->addr_size * 8,
						 unit->abfd,
						 attr.u.blk->data + 1);
			}
		      break;

		    default:
		      break;
		    }
		  break;

		default:
		  break;
		}
	    }
	}

      if (high_pc_relative)
	high_pc += low_pc;

      if (func && high_pc != 0)
	{
	  if (!arange_add (unit, &func->arange, low_pc, high_pc))
	    goto fail;
	}

      if (abbrev->has_children)
	{
	  nesting_level++;

	  if (nesting_level >= nested_funcs_size)
	    {
	      struct funcinfo **tmp;

	      nested_funcs_size *= 2;
	      tmp = (struct funcinfo **)
		bfd_realloc (nested_funcs,
			     nested_funcs_size * sizeof (struct funcinfo *));
	      if (tmp == NULL)
		goto fail;
	      nested_funcs = tmp;
	    }
	  nested_funcs[nesting_level] = 0;
	}
    }

  free (nested_funcs);
  return TRUE;

 fail:
  free (nested_funcs);
  return FALSE;
}

/* Parse a DWARF2 compilation unit starting at INFO_PTR.  This
   includes the compilation unit header that proceeds the DIE's, but
   does not include the length field that precedes each compilation
   unit header.  END_PTR points one past the end of this comp unit.
   OFFSET_SIZE is the size of DWARF2 offsets (either 4 or 8 bytes).

   This routine does not read the whole compilation unit; only enough
   to get to the line number information for the compilation unit.  */

static struct comp_unit *
parse_comp_unit (struct dwarf2_debug *stash,
		 bfd_vma unit_length,
		 bfd_byte *info_ptr_unit,
		 unsigned int offset_size)
{
  struct comp_unit* unit;
  unsigned int version;
  bfd_uint64_t abbrev_offset = 0;
  /* Initialize it just to avoid a GCC false warning.  */
  unsigned int addr_size = -1;
  struct abbrev_info** abbrevs;
  unsigned int abbrev_number, bytes_read, i;
  struct abbrev_info *abbrev;
  struct attribute attr;
  bfd_byte *info_ptr = stash->info_ptr;
  bfd_byte *end_ptr = info_ptr + unit_length;
  bfd_size_type amt;
  bfd_vma low_pc = 0;
  bfd_vma high_pc = 0;
  bfd *abfd = stash->bfd_ptr;
  bfd_boolean high_pc_relative = FALSE;
  enum dwarf_unit_type unit_type;

  version = read_2_bytes (abfd, info_ptr, end_ptr);
  info_ptr += 2;
  if (version < 2 || version > 5)
    {
      /* PR 19872: A version number of 0 probably means that there is padding
	 at the end of the .debug_info section.  Gold puts it there when
	 performing an incremental link, for example.  So do not generate
	 an error, just return a NULL.  */
      if (version)
	{
	  _bfd_error_handler
	    (_("Dwarf Error: found dwarf version '%u', this reader"
	       " only handles version 2, 3, 4 and 5 information."), version);
	  bfd_set_error (bfd_error_bad_value);
	}
      return NULL;
    }

  if (version < 5)
    unit_type = DW_UT_compile;
  else
    {
      unit_type = read_1_byte (abfd, info_ptr, end_ptr);
      info_ptr += 1;

      addr_size = read_1_byte (abfd, info_ptr, end_ptr);
      info_ptr += 1;
    }

  BFD_ASSERT (offset_size == 4 || offset_size == 8);
  if (offset_size == 4)
    abbrev_offset = read_4_bytes (abfd, info_ptr, end_ptr);
  else
    abbrev_offset = read_8_bytes (abfd, info_ptr, end_ptr);
  info_ptr += offset_size;

  if (version < 5)
    {
      addr_size = read_1_byte (abfd, info_ptr, end_ptr);
      info_ptr += 1;
    }

  if (unit_type == DW_UT_type)
    {
      /* Skip type signature.  */
      info_ptr += 8;

      /* Skip type offset.  */
      info_ptr += offset_size;
    }

  if (addr_size > sizeof (bfd_vma))
    {
      _bfd_error_handler
	/* xgettext: c-format */
	(_("Dwarf Error: found address size '%u', this reader"
	   " can not handle sizes greater than '%u'."),
	 addr_size,
	 (unsigned int) sizeof (bfd_vma));
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  if (addr_size != 2 && addr_size != 4 && addr_size != 8)
    {
      _bfd_error_handler
	("Dwarf Error: found address size '%u', this reader"
	 " can only handle address sizes '2', '4' and '8'.", addr_size);
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  /* Read the abbrevs for this compilation unit into a table.  */
  abbrevs = read_abbrevs (abfd, abbrev_offset, stash);
  if (! abbrevs)
    return NULL;

  abbrev_number = _bfd_safe_read_leb128 (abfd, info_ptr, &bytes_read,
					 FALSE, end_ptr);
  info_ptr += bytes_read;
  if (! abbrev_number)
    {
      /* PR 19872: An abbrev number of 0 probably means that there is padding
	 at the end of the .debug_abbrev section.  Gold puts it there when
	 performing an incremental link, for example.  So do not generate
	 an error, just return a NULL.  */
      return NULL;
    }

  abbrev = lookup_abbrev (abbrev_number, abbrevs);
  if (! abbrev)
    {
      _bfd_error_handler (_("Dwarf Error: Could not find abbrev number %u."),
			  abbrev_number);
      bfd_set_error (bfd_error_bad_value);
      return NULL;
    }

  amt = sizeof (struct comp_unit);
  unit = (struct comp_unit *) bfd_zalloc (abfd, amt);
  if (unit == NULL)
    return NULL;
  unit->abfd = abfd;
  unit->version = version;
  unit->addr_size = addr_size;
  unit->offset_size = offset_size;
  unit->abbrevs = abbrevs;
  unit->end_ptr = end_ptr;
  unit->stash = stash;
  unit->info_ptr_unit = info_ptr_unit;
  unit->sec_info_ptr = stash->sec_info_ptr;

  for (i = 0; i < abbrev->num_attrs; ++i)
    {
      info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr, end_ptr);
      if (info_ptr == NULL)
	return NULL;

      /* Store the data if it is of an attribute we want to keep in a
	 partial symbol table.  */
      switch (attr.name)
	{
	case DW_AT_stmt_list:
	  unit->stmtlist = 1;
	  unit->line_offset = attr.u.val;
	  break;

	case DW_AT_name:
	  unit->name = attr.u.str;
	  break;

	case DW_AT_low_pc:
	  low_pc = attr.u.val;
	  /* If the compilation unit DIE has a DW_AT_low_pc attribute,
	     this is the base address to use when reading location
	     lists or range lists.  */
	  if (abbrev->tag == DW_TAG_compile_unit)
	    unit->base_address = low_pc;
	  break;

	case DW_AT_high_pc:
	  high_pc = attr.u.val;
	  high_pc_relative = attr.form != DW_FORM_addr;
	  break;

	case DW_AT_ranges:
	  if (!read_rangelist (unit, &unit->arange, attr.u.val))
	    return NULL;
	  break;

	case DW_AT_comp_dir:
	  {
	    char *comp_dir = attr.u.str;

	    /* PR 17512: file: 1fe726be.  */
	    if (! is_str_attr (attr.form))
	      {
		_bfd_error_handler
		  (_("Dwarf Error: DW_AT_comp_dir attribute encountered with a non-string form."));
		comp_dir = NULL;
	      }

	    if (comp_dir)
	      {
		/* Irix 6.2 native cc prepends <machine>.: to the compilation
		   directory, get rid of it.  */
		char *cp = strchr (comp_dir, ':');

		if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/')
		  comp_dir = cp + 1;
	      }
	    unit->comp_dir = comp_dir;
	    break;
	  }

	case DW_AT_language:
	  unit->lang = attr.u.val;
	  break;

	default:
	  break;
	}
    }
  if (high_pc_relative)
    high_pc += low_pc;
  if (high_pc != 0)
    {
      if (!arange_add (unit, &unit->arange, low_pc, high_pc))
	return NULL;
    }

  unit->first_child_die_ptr = info_ptr;
  return unit;
}

/* Return TRUE if UNIT may contain the address given by ADDR.  When
   there are functions written entirely with inline asm statements, the
   range info in the compilation unit header may not be correct.  We
   need to consult the line info table to see if a compilation unit
   really contains the given address.  */

static bfd_boolean
comp_unit_contains_address (struct comp_unit *unit, bfd_vma addr)
{
  struct arange *arange;

  if (unit->error)
    return FALSE;

  arange = &unit->arange;
  do
    {
      if (addr >= arange->low && addr < arange->high)
	return TRUE;
      arange = arange->next;
    }
  while (arange);

  return FALSE;
}

/* If UNIT contains ADDR, set the output parameters to the values for
   the line containing ADDR.  The output parameters, FILENAME_PTR,
   FUNCTION_PTR, and LINENUMBER_PTR, are pointers to the objects
   to be filled in.

   Returns the range of addresses covered by the entry that was used
   to fill in *LINENUMBER_PTR or 0 if it was not filled in.  */

static bfd_vma
comp_unit_find_nearest_line (struct comp_unit *unit,
			     bfd_vma addr,
			     const char **filename_ptr,
			     struct funcinfo **function_ptr,
			     unsigned int *linenumber_ptr,
			     unsigned int *discriminator_ptr,
			     struct dwarf2_debug *stash)
{
  bfd_boolean func_p;

  if (unit->error)
    return FALSE;

  if (! unit->line_table)
    {
      if (! unit->stmtlist)
	{
	  unit->error = 1;
	  return FALSE;
	}

      unit->line_table = decode_line_info (unit, stash);

      if (! unit->line_table)
	{
	  unit->error = 1;
	  return FALSE;
	}

      if (unit->first_child_die_ptr < unit->end_ptr
	  && ! scan_unit_for_symbols (unit))
	{
	  unit->error = 1;
	  return FALSE;
	}
    }

  *function_ptr = NULL;
  func_p = lookup_address_in_function_table (unit, addr, function_ptr);
  if (func_p && (*function_ptr)->tag == DW_TAG_inlined_subroutine)
    stash->inliner_chain = *function_ptr;

  return lookup_address_in_line_info_table (unit->line_table, addr,
					    filename_ptr,
					    linenumber_ptr,
					    discriminator_ptr);
}

/* Check to see if line info is already decoded in a comp_unit.
   If not, decode it.  Returns TRUE if no errors were encountered;
   FALSE otherwise.  */

static bfd_boolean
comp_unit_maybe_decode_line_info (struct comp_unit *unit,
				  struct dwarf2_debug *stash)
{
  if (unit->error)
    return FALSE;

  if (! unit->line_table)
    {
      if (! unit->stmtlist)
	{
	  unit->error = 1;
	  return FALSE;
	}

      unit->line_table = decode_line_info (unit, stash);

      if (! unit->line_table)
	{
	  unit->error = 1;
	  return FALSE;
	}

      if (unit->first_child_die_ptr < unit->end_ptr
	  && ! scan_unit_for_symbols (unit))
	{
	  unit->error = 1;
	  return FALSE;
	}
    }

  return TRUE;
}

/* If UNIT contains SYM at ADDR, set the output parameters to the
   values for the line containing SYM.  The output parameters,
   FILENAME_PTR, and LINENUMBER_PTR, are pointers to the objects to be
   filled in.

   Return TRUE if UNIT contains SYM, and no errors were encountered;
   FALSE otherwise.  */

static bfd_boolean
comp_unit_find_line (struct comp_unit *unit,
		     asymbol *sym,
		     bfd_vma addr,
		     const char **filename_ptr,
		     unsigned int *linenumber_ptr,
		     struct dwarf2_debug *stash)
{
  if (!comp_unit_maybe_decode_line_info (unit, stash))
    return FALSE;

  if (sym->flags & BSF_FUNCTION)
    return lookup_symbol_in_function_table (unit, sym, addr,
					    filename_ptr,
					    linenumber_ptr);

  return lookup_symbol_in_variable_table (unit, sym, addr,
					  filename_ptr,
					  linenumber_ptr);
}

static struct funcinfo *
reverse_funcinfo_list (struct funcinfo *head)
{
  struct funcinfo *rhead;
  struct funcinfo *temp;

  for (rhead = NULL; head; head = temp)
    {
      temp = head->prev_func;
      head->prev_func = rhead;
      rhead = head;
    }
  return rhead;
}

static struct varinfo *
reverse_varinfo_list (struct varinfo *head)
{
  struct varinfo *rhead;
  struct varinfo *temp;

  for (rhead = NULL; head; head = temp)
    {
      temp = head->prev_var;
      head->prev_var = rhead;
      rhead = head;
    }
  return rhead;
}

/* Extract all interesting funcinfos and varinfos of a compilation
   unit into hash tables for faster lookup.  Returns TRUE if no
   errors were enountered; FALSE otherwise.  */

static bfd_boolean
comp_unit_hash_info (struct dwarf2_debug *stash,
		     struct comp_unit *unit,
		     struct info_hash_table *funcinfo_hash_table,
		     struct info_hash_table *varinfo_hash_table)
{
  struct funcinfo* each_func;
  struct varinfo* each_var;
  bfd_boolean okay = TRUE;

  BFD_ASSERT (stash->info_hash_status != STASH_INFO_HASH_DISABLED);

  if (!comp_unit_maybe_decode_line_info (unit, stash))
    return FALSE;

  BFD_ASSERT (!unit->cached);

  /* To preserve the original search order, we went to visit the function
     infos in the reversed order of the list.  However, making the list
     bi-directional use quite a bit of extra memory.  So we reverse
     the list first, traverse the list in the now reversed order and
     finally reverse the list again to get back the original order.  */
  unit->function_table = reverse_funcinfo_list (unit->function_table);
  for (each_func = unit->function_table;
       each_func && okay;
       each_func = each_func->prev_func)
    {
      /* Skip nameless functions.  */
      if (each_func->name)
	/* There is no need to copy name string into hash table as
	   name string is either in the dwarf string buffer or
	   info in the stash.  */
	okay = insert_info_hash_table (funcinfo_hash_table, each_func->name,
				       (void*) each_func, FALSE);
    }
  unit->function_table = reverse_funcinfo_list (unit->function_table);
  if (!okay)
    return FALSE;

  /* We do the same for variable infos.  */
  unit->variable_table = reverse_varinfo_list (unit->variable_table);
  for (each_var = unit->variable_table;
       each_var && okay;
       each_var = each_var->prev_var)
    {
      /* Skip stack vars and vars with no files or names.  */
      if (each_var->stack == 0
	  && each_var->file != NULL
	  && each_var->name != NULL)
	/* There is no need to copy name string into hash table as
	   name string is either in the dwarf string buffer or
	   info in the stash.  */
	okay = insert_info_hash_table (varinfo_hash_table, each_var->name,
				       (void*) each_var, FALSE);
    }

  unit->variable_table = reverse_varinfo_list (unit->variable_table);
  unit->cached = TRUE;
  return okay;
}

/* Locate a section in a BFD containing debugging info.  The search starts
   from the section after AFTER_SEC, or from the first section in the BFD if
   AFTER_SEC is NULL.  The search works by examining the names of the
   sections.  There are three permissiable names.  The first two are given
   by DEBUG_SECTIONS[debug_info] (whose standard DWARF2 names are .debug_info
   and .zdebug_info).  The third is a prefix .gnu.linkonce.wi.
   This is a variation on the .debug_info section which has a checksum
   describing the contents appended onto the name.  This allows the linker to
   identify and discard duplicate debugging sections for different
   compilation units.  */
#define GNU_LINKONCE_INFO ".gnu.linkonce.wi."

static asection *
find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections,
		 asection *after_sec)
{
  asection *msec;
  const char *look;

  if (after_sec == NULL)
    {
      look = debug_sections[debug_info].uncompressed_name;
      msec = bfd_get_section_by_name (abfd, look);
      if (msec != NULL)
	return msec;

      look = debug_sections[debug_info].compressed_name;
      if (look != NULL)
	{
	  msec = bfd_get_section_by_name (abfd, look);
	  if (msec != NULL)
	    return msec;
	}

      for (msec = abfd->sections; msec != NULL; msec = msec->next)
	if (CONST_STRNEQ (msec->name, GNU_LINKONCE_INFO))
	  return msec;

      return NULL;
    }

  for (msec = after_sec->next; msec != NULL; msec = msec->next)
    {
      look = debug_sections[debug_info].uncompressed_name;
      if (strcmp (msec->name, look) == 0)
	return msec;

      look = debug_sections[debug_info].compressed_name;
      if (look != NULL && strcmp (msec->name, look) == 0)
	return msec;

      if (CONST_STRNEQ (msec->name, GNU_LINKONCE_INFO))
	return msec;
    }

  return NULL;
}

/* Transfer VMAs from object file to separate debug file.  */

static void
set_debug_vma (bfd *orig_bfd, bfd *debug_bfd)
{
  asection *s, *d;

  for (s = orig_bfd->sections, d = debug_bfd->sections;
       s != NULL && d != NULL;
       s = s->next, d = d->next)
    {
      if ((d->flags & SEC_DEBUGGING) != 0)
	break;
      /* ??? Assumes 1-1 correspondence between sections in the
	 two files.  */
      if (strcmp (s->name, d->name) == 0)
	{
	  d->output_section = s->output_section;
	  d->output_offset = s->output_offset;
	  d->vma = s->vma;
	}
    }
}

/* Unset vmas for adjusted sections in STASH.  */

static void
unset_sections (struct dwarf2_debug *stash)
{
  int i;
  struct adjusted_section *p;

  i = stash->adjusted_section_count;
  p = stash->adjusted_sections;
  for (; i > 0; i--, p++)
    p->section->vma = 0;
}

/* Set VMAs for allocated and .debug_info sections in ORIG_BFD, a
   relocatable object file.  VMAs are normally all zero in relocatable
   object files, so if we want to distinguish locations in sections by
   address we need to set VMAs so the sections do not overlap.  We
   also set VMA on .debug_info so that when we have multiple
   .debug_info sections (or the linkonce variant) they also do not
   overlap.  The multiple .debug_info sections make up a single
   logical section.  ??? We should probably do the same for other
   debug sections.  */

static bfd_boolean
place_sections (bfd *orig_bfd, struct dwarf2_debug *stash)
{
  bfd *abfd;
  struct adjusted_section *p;
  int i;
  const char *debug_info_name;

  if (stash->adjusted_section_count != 0)
    {
      i = stash->adjusted_section_count;
      p = stash->adjusted_sections;
      for (; i > 0; i--, p++)
	p->section->vma = p->adj_vma;
      return TRUE;
    }

  debug_info_name = stash->debug_sections[debug_info].uncompressed_name;
  i = 0;
  abfd = orig_bfd;
  while (1)
    {
      asection *sect;

      for (sect = abfd->sections; sect != NULL; sect = sect->next)
	{
	  int is_debug_info;

	  if ((sect->output_section != NULL
	       && sect->output_section != sect
	       && (sect->flags & SEC_DEBUGGING) == 0)
	      || sect->vma != 0)
	    continue;

	  is_debug_info = (strcmp (sect->name, debug_info_name) == 0
			   || CONST_STRNEQ (sect->name, GNU_LINKONCE_INFO));

	  if (!((sect->flags & SEC_ALLOC) != 0 && abfd == orig_bfd)
	      && !is_debug_info)
	    continue;

	  i++;
	}
      if (abfd == stash->bfd_ptr)
	break;
      abfd = stash->bfd_ptr;
    }

  if (i <= 1)
    stash->adjusted_section_count = -1;
  else
    {
      bfd_vma last_vma = 0, last_dwarf = 0;
      bfd_size_type amt = i * sizeof (struct adjusted_section);

      p = (struct adjusted_section *) bfd_malloc (amt);
      if (p == NULL)
	return FALSE;

      stash->adjusted_sections = p;
      stash->adjusted_section_count = i;

      abfd = orig_bfd;
      while (1)
	{
	  asection *sect;

	  for (sect = abfd->sections; sect != NULL; sect = sect->next)
	    {
	      bfd_size_type sz;
	      int is_debug_info;

	      if ((sect->output_section != NULL
		   && sect->output_section != sect
		   && (sect->flags & SEC_DEBUGGING) == 0)
		  || sect->vma != 0)
		continue;

	      is_debug_info = (strcmp (sect->name, debug_info_name) == 0
			       || CONST_STRNEQ (sect->name, GNU_LINKONCE_INFO));

	      if (!((sect->flags & SEC_ALLOC) != 0 && abfd == orig_bfd)
		  && !is_debug_info)
		continue;

	      sz = sect->rawsize ? sect->rawsize : sect->size;

	      if (is_debug_info)
		{
		  BFD_ASSERT (sect->alignment_power == 0);
		  sect->vma = last_dwarf;
		  last_dwarf += sz;
		}
	      else
		{
		  /* Align the new address to the current section
		     alignment.  */
		  last_vma = ((last_vma
			       + ~(-((bfd_vma) 1 << sect->alignment_power)))
			      & (-((bfd_vma) 1 << sect->alignment_power)));
		  sect->vma = last_vma;
		  last_vma += sz;
		}

	      p->section = sect;
	      p->adj_vma = sect->vma;
	      p++;
	    }
	  if (abfd == stash->bfd_ptr)
	    break;
	  abfd = stash->bfd_ptr;
	}
    }

  if (orig_bfd != stash->bfd_ptr)
    set_debug_vma (orig_bfd, stash->bfd_ptr);

  return TRUE;
}

/* Look up a funcinfo by name using the given info hash table.  If found,
   also update the locations pointed to by filename_ptr and linenumber_ptr.

   This function returns TRUE if a funcinfo that matches the given symbol
   and address is found with any error; otherwise it returns FALSE.  */

static bfd_boolean
info_hash_lookup_funcinfo (struct info_hash_table *hash_table,
			   asymbol *sym,
			   bfd_vma addr,
			   const char **filename_ptr,
			   unsigned int *linenumber_ptr)
{
  struct funcinfo* each_func;
  struct funcinfo* best_fit = NULL;
  bfd_vma best_fit_len = 0;
  struct info_list_node *node;
  struct arange *arange;
  const char *name = bfd_asymbol_name (sym);
  asection *sec = bfd_get_section (sym);

  for (node = lookup_info_hash_table (hash_table, name);
       node;
       node = node->next)
    {
      each_func = (struct funcinfo *) node->info;
      for (arange = &each_func->arange;
	   arange;
	   arange = arange->next)
	{
	  if ((!each_func->sec || each_func->sec == sec)
	      && addr >= arange->low
	      && addr < arange->high
	      && (!best_fit
		  || arange->high - arange->low < best_fit_len))
	    {
	      best_fit = each_func;
	      best_fit_len = arange->high - arange->low;
	    }
	}
    }

  if (best_fit)
    {
      best_fit->sec = sec;
      *filename_ptr = best_fit->file;
      *linenumber_ptr = best_fit->line;
      return TRUE;
    }

  return FALSE;
}

/* Look up a varinfo by name using the given info hash table.  If found,
   also update the locations pointed to by filename_ptr and linenumber_ptr.

   This function returns TRUE if a varinfo that matches the given symbol
   and address is found with any error; otherwise it returns FALSE.  */

static bfd_boolean
info_hash_lookup_varinfo (struct info_hash_table *hash_table,
			  asymbol *sym,
			  bfd_vma addr,
			  const char **filename_ptr,
			  unsigned int *linenumber_ptr)
{
  const char *name = bfd_asymbol_name (sym);
  asection *sec = bfd_get_section (sym);
  struct varinfo* each;
  struct info_list_node *node;

  for (node = lookup_info_hash_table (hash_table, name);
       node;
       node = node->next)
    {
      each = (struct varinfo *) node->info;
      if (each->addr == addr
	  && (!each->sec || each->sec == sec))
	{
	  each->sec = sec;
	  *filename_ptr = each->file;
	  *linenumber_ptr = each->line;
	  return TRUE;
	}
    }

  return FALSE;
}

/* Update the funcinfo and varinfo info hash tables if they are
   not up to date.  Returns TRUE if there is no error; otherwise
   returns FALSE and disable the info hash tables.  */

static bfd_boolean
stash_maybe_update_info_hash_tables (struct dwarf2_debug *stash)
{
  struct comp_unit *each;

  /* Exit if hash tables are up-to-date.  */
  if (stash->all_comp_units == stash->hash_units_head)
    return TRUE;

  if (stash->hash_units_head)
    each = stash->hash_units_head->prev_unit;
  else
    each = stash->last_comp_unit;

  while (each)
    {
      if (!comp_unit_hash_info (stash, each, stash->funcinfo_hash_table,
				stash->varinfo_hash_table))
	{
	  stash->info_hash_status = STASH_INFO_HASH_DISABLED;
	  return FALSE;
	}
      each = each->prev_unit;
    }

  stash->hash_units_head = stash->all_comp_units;
  return TRUE;
}

/* Check consistency of info hash tables.  This is for debugging only.  */

static void ATTRIBUTE_UNUSED
stash_verify_info_hash_table (struct dwarf2_debug *stash)
{
  struct comp_unit *each_unit;
  struct funcinfo *each_func;
  struct varinfo *each_var;
  struct info_list_node *node;
  bfd_boolean found;

  for (each_unit = stash->all_comp_units;
       each_unit;
       each_unit = each_unit->next_unit)
    {
      for (each_func = each_unit->function_table;
	   each_func;
	   each_func = each_func->prev_func)
	{
	  if (!each_func->name)
	    continue;
	  node = lookup_info_hash_table (stash->funcinfo_hash_table,
					 each_func->name);
	  BFD_ASSERT (node);
	  found = FALSE;
	  while (node && !found)
	    {
	      found = node->info == each_func;
	      node = node->next;
	    }
	  BFD_ASSERT (found);
	}

      for (each_var = each_unit->variable_table;
	   each_var;
	   each_var = each_var->prev_var)
	{
	  if (!each_var->name || !each_var->file || each_var->stack)
	    continue;
	  node = lookup_info_hash_table (stash->varinfo_hash_table,
					 each_var->name);
	  BFD_ASSERT (node);
	  found = FALSE;
	  while (node && !found)
	    {
	      found = node->info == each_var;
	      node = node->next;
	    }
	  BFD_ASSERT (found);
	}
    }
}

/* Check to see if we want to enable the info hash tables, which consume
   quite a bit of memory.  Currently we only check the number times
   bfd_dwarf2_find_line is called.  In the future, we may also want to
   take the number of symbols into account.  */

static void
stash_maybe_enable_info_hash_tables (bfd *abfd, struct dwarf2_debug *stash)
{
  BFD_ASSERT (stash->info_hash_status == STASH_INFO_HASH_OFF);

  if (stash->info_hash_count++ < STASH_INFO_HASH_TRIGGER)
    return;

  /* FIXME: Maybe we should check the reduce_memory_overheads
     and optimize fields in the bfd_link_info structure ?  */

  /* Create hash tables.  */
  stash->funcinfo_hash_table = create_info_hash_table (abfd);
  stash->varinfo_hash_table = create_info_hash_table (abfd);
  if (!stash->funcinfo_hash_table || !stash->varinfo_hash_table)
    {
      /* Turn off info hashes if any allocation above fails.  */
      stash->info_hash_status = STASH_INFO_HASH_DISABLED;
      return;
    }
  /* We need a forced update so that the info hash tables will
     be created even though there is no compilation unit.  That
     happens if STASH_INFO_HASH_TRIGGER is 0.  */
  stash_maybe_update_info_hash_tables (stash);
  stash->info_hash_status = STASH_INFO_HASH_ON;
}

/* Find the file and line associated with a symbol and address using the
   info hash tables of a stash. If there is a match, the function returns
   TRUE and update the locations pointed to by filename_ptr and linenumber_ptr;
   otherwise it returns FALSE.  */

static bfd_boolean
stash_find_line_fast (struct dwarf2_debug *stash,
		      asymbol *sym,
		      bfd_vma addr,
		      const char **filename_ptr,
		      unsigned int *linenumber_ptr)
{
  BFD_ASSERT (stash->info_hash_status == STASH_INFO_HASH_ON);

  if (sym->flags & BSF_FUNCTION)
    return info_hash_lookup_funcinfo (stash->funcinfo_hash_table, sym, addr,
				      filename_ptr, linenumber_ptr);
  return info_hash_lookup_varinfo (stash->varinfo_hash_table, sym, addr,
				   filename_ptr, linenumber_ptr);
}

/* Save current section VMAs.  */

static bfd_boolean
save_section_vma (const bfd *abfd, struct dwarf2_debug *stash)
{
  asection *s;
  unsigned int i;

  if (abfd->section_count == 0)
    return TRUE;
  stash->sec_vma = bfd_malloc (sizeof (*stash->sec_vma) * abfd->section_count);
  if (stash->sec_vma == NULL)
    return FALSE;
  for (i = 0, s = abfd->sections; i < abfd->section_count; i++, s = s->next)
    {
      if (s->output_section != NULL)
	stash->sec_vma[i] = s->output_section->vma + s->output_offset;
      else
	stash->sec_vma[i] = s->vma;
    }
  return TRUE;
}

/* Compare current section VMAs against those at the time the stash
   was created.  If find_nearest_line is used in linker warnings or
   errors early in the link process, the debug info stash will be
   invalid for later calls.  This is because we relocate debug info
   sections, so the stashed section contents depend on symbol values,
   which in turn depend on section VMAs.  */

static bfd_boolean
section_vma_same (const bfd *abfd, const struct dwarf2_debug *stash)
{
  asection *s;
  unsigned int i;

  for (i = 0, s = abfd->sections; i < abfd->section_count; i++, s = s->next)
    {
      bfd_vma vma;

      if (s->output_section != NULL)
	vma = s->output_section->vma + s->output_offset;
      else
	vma = s->vma;
      if (vma != stash->sec_vma[i])
	return FALSE;
    }
  return TRUE;
}

/* Read debug information from DEBUG_BFD when DEBUG_BFD is specified.
   If DEBUG_BFD is not specified, we read debug information from ABFD
   or its gnu_debuglink. The results will be stored in PINFO.
   The function returns TRUE iff debug information is ready.  */

bfd_boolean
_bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd,
			      const struct dwarf_debug_section *debug_sections,
			      asymbol **symbols,
			      void **pinfo,
			      bfd_boolean do_place)
{
  bfd_size_type amt = sizeof (struct dwarf2_debug);
  bfd_size_type total_size;
  asection *msec;
  struct dwarf2_debug *stash = (struct dwarf2_debug *) *pinfo;

  if (stash != NULL)
    {
      if (stash->orig_bfd == abfd
          && section_vma_same (abfd, stash))
        {
          /* Check that we did previously find some debug information
             before attempting to make use of it.  */
          if (stash->bfd_ptr != NULL)
            {
              if (do_place && !place_sections (abfd, stash))
                return FALSE;
              return TRUE;
            }

          return FALSE;
        }
      _bfd_dwarf2_cleanup_debug_info (abfd, pinfo);
      memset (stash, 0, amt);
    }
  else
    {
      stash = (struct dwarf2_debug *) bfd_zalloc (abfd, amt);
      if (! stash)
	return FALSE;
    }
  stash->orig_bfd = abfd;
  stash->debug_sections = debug_sections;
  stash->syms = symbols;
  if (!save_section_vma (abfd, stash))
    return FALSE;

  *pinfo = stash;

  if (debug_bfd == NULL)
    debug_bfd = abfd;

  msec = find_debug_info (debug_bfd, debug_sections, NULL);
  if (msec == NULL && abfd == debug_bfd)
    {
      char * debug_filename;

      debug_filename = bfd_follow_build_id_debuglink (abfd, DEBUGDIR);
      if (debug_filename == NULL)
	debug_filename = bfd_follow_gnu_debuglink (abfd, DEBUGDIR);

      if (debug_filename == NULL)
	/* No dwarf2 info, and no gnu_debuglink to follow.
	   Note that at this point the stash has been allocated, but
	   contains zeros.  This lets future calls to this function
	   fail more quickly.  */
	return FALSE;

      /* Set BFD_DECOMPRESS to decompress debug sections.  */
      if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL
	  || !(debug_bfd->flags |= BFD_DECOMPRESS,
	       bfd_check_format (debug_bfd, bfd_object))
	  || (msec = find_debug_info (debug_bfd,
				      debug_sections, NULL)) == NULL
	  || !bfd_generic_link_read_symbols (debug_bfd))
	{
	  if (debug_bfd)
	    bfd_close (debug_bfd);
	  /* FIXME: Should we report our failure to follow the debuglink ?  */
	  free (debug_filename);
	  return FALSE;
	}

      symbols = bfd_get_outsymbols (debug_bfd);
      stash->syms = symbols;
      stash->close_on_cleanup = TRUE;
    }
  stash->bfd_ptr = debug_bfd;

  if (do_place
      && !place_sections (abfd, stash))
    return FALSE;

  /* There can be more than one DWARF2 info section in a BFD these
     days.  First handle the easy case when there's only one.  If
     there's more than one, try case two: none of the sections is
     compressed.  In that case, read them all in and produce one
     large stash.  We do this in two passes - in the first pass we
     just accumulate the section sizes, and in the second pass we
     read in the section's contents.  (The allows us to avoid
     reallocing the data as we add sections to the stash.)  If
     some or all sections are compressed, then do things the slow
     way, with a bunch of reallocs.  */

  if (! find_debug_info (debug_bfd, debug_sections, msec))
    {
      /* Case 1: only one info section.  */
      total_size = msec->size;
      if (! read_section (debug_bfd, &stash->debug_sections[debug_info],
			  symbols, 0,
			  &stash->info_ptr_memory, &total_size))
	return FALSE;
    }
  else
    {
      /* Case 2: multiple sections.  */
      for (total_size = 0;
	   msec;
	   msec = find_debug_info (debug_bfd, debug_sections, msec))
	total_size += msec->size;

      stash->info_ptr_memory = (bfd_byte *) bfd_malloc (total_size);
      if (stash->info_ptr_memory == NULL)
	return FALSE;

      total_size = 0;
      for (msec = find_debug_info (debug_bfd, debug_sections, NULL);
	   msec;
	   msec = find_debug_info (debug_bfd, debug_sections, msec))
	{
	  bfd_size_type size;

	  size = msec->size;
	  if (size == 0)
	    continue;

	  if (!(bfd_simple_get_relocated_section_contents
		(debug_bfd, msec, stash->info_ptr_memory + total_size,
		 symbols)))
	    return FALSE;

	  total_size += size;
	}
    }

  stash->info_ptr = stash->info_ptr_memory;
  stash->info_ptr_end = stash->info_ptr + total_size;
  stash->sec = find_debug_info (debug_bfd, debug_sections, NULL);
  stash->sec_info_ptr = stash->info_ptr;
  return TRUE;
}

/* Scan the debug information in PINFO looking for a DW_TAG_subprogram
   abbrev with a DW_AT_low_pc attached to it.  Then lookup that same
   symbol in SYMBOLS and return the difference between the low_pc and
   the symbol's address.  Returns 0 if no suitable symbol could be found.  */

bfd_signed_vma
_bfd_dwarf2_find_symbol_bias (asymbol ** symbols, void ** pinfo)
{
  struct dwarf2_debug *stash;
  struct comp_unit * unit;

  stash = (struct dwarf2_debug *) *pinfo;

  if (stash == NULL)
    return 0;

  for (unit = stash->all_comp_units; unit; unit = unit->next_unit)
    {
      struct funcinfo * func;

      if (unit->function_table == NULL)
	{
	  if (unit->line_table == NULL)
	    unit->line_table = decode_line_info (unit, stash);
	  if (unit->line_table != NULL)
	    scan_unit_for_symbols (unit);
	}

      for (func = unit->function_table; func != NULL; func = func->prev_func)
	if (func->name && func->arange.low)
	  {
	    asymbol ** psym;

	    /* FIXME: Do we need to scan the aranges looking for the lowest pc value ?  */

	    for (psym = symbols; * psym != NULL; psym++)
	      {
		asymbol * sym = * psym;

		if (sym->flags & BSF_FUNCTION
		    && sym->section != NULL
		    && strcmp (sym->name, func->name) == 0)
		  return ((bfd_signed_vma) func->arange.low) -
		    ((bfd_signed_vma) (sym->value + sym->section->vma));
	      }
	  }
    }

  return 0;
}

/* Find the source code location of SYMBOL.  If SYMBOL is NULL
   then find the nearest source code location corresponding to
   the address SECTION + OFFSET.
   Returns TRUE if the line is found without error and fills in
   FILENAME_PTR and LINENUMBER_PTR.  In the case where SYMBOL was
   NULL the FUNCTIONNAME_PTR is also filled in.
   SYMBOLS contains the symbol table for ABFD.
   DEBUG_SECTIONS contains the name of the dwarf debug sections.
   ADDR_SIZE is the number of bytes in the initial .debug_info length
   field and in the abbreviation offset, or zero to indicate that the
   default value should be used.  */

bfd_boolean
_bfd_dwarf2_find_nearest_line (bfd *abfd,
			       asymbol **symbols,
			       asymbol *symbol,
			       asection *section,
			       bfd_vma offset,
			       const char **filename_ptr,
			       const char **functionname_ptr,
			       unsigned int *linenumber_ptr,
			       unsigned int *discriminator_ptr,
			       const struct dwarf_debug_section *debug_sections,
			       unsigned int addr_size,
			       void **pinfo)
{
  /* Read each compilation unit from the section .debug_info, and check
     to see if it contains the address we are searching for.  If yes,
     lookup the address, and return the line number info.  If no, go
     on to the next compilation unit.

     We keep a list of all the previously read compilation units, and
     a pointer to the next un-read compilation unit.  Check the
     previously read units before reading more.  */
  struct dwarf2_debug *stash;
  /* What address are we looking for?  */
  bfd_vma addr;
  struct comp_unit* each;
  struct funcinfo *function = NULL;
  bfd_boolean found = FALSE;
  bfd_boolean do_line;

  *filename_ptr = NULL;
  if (functionname_ptr != NULL)
    *functionname_ptr = NULL;
  *linenumber_ptr = 0;
  if (discriminator_ptr)
    *discriminator_ptr = 0;

  if (! _bfd_dwarf2_slurp_debug_info (abfd, NULL, debug_sections,
				      symbols, pinfo,
				      (abfd->flags & (EXEC_P | DYNAMIC)) == 0))
    return FALSE;

  stash = (struct dwarf2_debug *) *pinfo;

  do_line = symbol != NULL;
  if (do_line)
    {
      BFD_ASSERT (section == NULL && offset == 0 && functionname_ptr == NULL);
      section = bfd_get_section (symbol);
      addr = symbol->value;
    }
  else
    {
      BFD_ASSERT (section != NULL && functionname_ptr != NULL);
      addr = offset;

      /* If we have no SYMBOL but the section we're looking at is not a
         code section, then take a look through the list of symbols to see
         if we have a symbol at the address we're looking for.  If we do
         then use this to look up line information.  This will allow us to
         give file and line results for data symbols.  We exclude code
         symbols here, if we look up a function symbol and then look up the
         line information we'll actually return the line number for the
         opening '{' rather than the function definition line.  This is
         because looking up by symbol uses the line table, in which the
         first line for a function is usually the opening '{', while
         looking up the function by section + offset uses the
         DW_AT_decl_line from the function DW_TAG_subprogram for the line,
         which will be the line of the function name.  */
      if (symbols != NULL && (section->flags & SEC_CODE) == 0)
	{
	  asymbol **tmp;

	  for (tmp = symbols; (*tmp) != NULL; ++tmp)
	    if ((*tmp)->the_bfd == abfd
		&& (*tmp)->section == section
		&& (*tmp)->value == offset
		&& ((*tmp)->flags & BSF_SECTION_SYM) == 0)
	      {
		symbol = *tmp;
		do_line = TRUE;
                /* For local symbols, keep going in the hope we find a
                   global.  */
                if ((symbol->flags & BSF_GLOBAL) != 0)
                  break;
	      }
	}
    }

  if (section->output_section)
    addr += section->output_section->vma + section->output_offset;
  else
    addr += section->vma;

  /* A null info_ptr indicates that there is no dwarf2 info
     (or that an error occured while setting up the stash).  */
  if (! stash->info_ptr)
    return FALSE;

  stash->inliner_chain = NULL;

  /* Check the previously read comp. units first.  */
  if (do_line)
    {
      /* The info hash tables use quite a bit of memory.  We may not want to
	 always use them.  We use some heuristics to decide if and when to
	 turn it on.  */
      if (stash->info_hash_status == STASH_INFO_HASH_OFF)
	stash_maybe_enable_info_hash_tables (abfd, stash);

      /* Keep info hash table up to date if they are available.  Note that we
	 may disable the hash tables if there is any error duing update.  */
      if (stash->info_hash_status == STASH_INFO_HASH_ON)
	stash_maybe_update_info_hash_tables (stash);

      if (stash->info_hash_status == STASH_INFO_HASH_ON)
	{
	  found = stash_find_line_fast (stash, symbol, addr, filename_ptr,
					linenumber_ptr);
	  if (found)
	    goto done;
	}
      else
	{
	  /* Check the previously read comp. units first.  */
	  for (each = stash->all_comp_units; each; each = each->next_unit)
	    if ((symbol->flags & BSF_FUNCTION) == 0
		|| each->arange.high == 0
		|| comp_unit_contains_address (each, addr))
	      {
		found = comp_unit_find_line (each, symbol, addr, filename_ptr,
					     linenumber_ptr, stash);
		if (found)
		  goto done;
	      }
	}
    }
  else
    {
      bfd_vma min_range = (bfd_vma) -1;
      const char * local_filename = NULL;
      struct funcinfo *local_function = NULL;
      unsigned int local_linenumber = 0;
      unsigned int local_discriminator = 0;

      for (each = stash->all_comp_units; each; each = each->next_unit)
	{
	  bfd_vma range = (bfd_vma) -1;

	  found = ((each->arange.high == 0
		    || comp_unit_contains_address (each, addr))
		   && (range = comp_unit_find_nearest_line (each, addr,
							    & local_filename,
							    & local_function,
							    & local_linenumber,
							    & local_discriminator,
							    stash)) != 0);
	  if (found)
	    {
	      /* PRs 15935 15994: Bogus debug information may have provided us
		 with an erroneous match.  We attempt to counter this by
		 selecting the match that has the smallest address range
		 associated with it.  (We are assuming that corrupt debug info
		 will tend to result in extra large address ranges rather than
		 extra small ranges).

		 This does mean that we scan through all of the CUs associated
		 with the bfd each time this function is called.  But this does
		 have the benefit of producing consistent results every time the
		 function is called.  */
	      if (range <= min_range)
		{
		  if (filename_ptr && local_filename)
		    * filename_ptr = local_filename;
		  if (local_function)
		    function = local_function;
		  if (discriminator_ptr && local_discriminator)
		    * discriminator_ptr = local_discriminator;
		  if (local_linenumber)
		    * linenumber_ptr = local_linenumber;
		  min_range = range;
		}
	    }
	}

      if (* linenumber_ptr)
	{
	  found = TRUE;
	  goto done;
	}
    }

  /* The DWARF2 spec says that the initial length field, and the
     offset of the abbreviation table, should both be 4-byte values.
     However, some compilers do things differently.  */
  if (addr_size == 0)
    addr_size = 4;
  BFD_ASSERT (addr_size == 4 || addr_size == 8);

  /* Read each remaining comp. units checking each as they are read.  */
  while (stash->info_ptr < stash->info_ptr_end)
    {
      bfd_vma length;
      unsigned int offset_size = addr_size;
      bfd_byte *info_ptr_unit = stash->info_ptr;

      length = read_4_bytes (stash->bfd_ptr, stash->info_ptr, stash->info_ptr_end);
      /* A 0xffffff length is the DWARF3 way of indicating
	 we use 64-bit offsets, instead of 32-bit offsets.  */
      if (length == 0xffffffff)
	{
	  offset_size = 8;
	  length = read_8_bytes (stash->bfd_ptr, stash->info_ptr + 4, stash->info_ptr_end);
	  stash->info_ptr += 12;
	}
      /* A zero length is the IRIX way of indicating 64-bit offsets,
	 mostly because the 64-bit length will generally fit in 32
	 bits, and the endianness helps.  */
      else if (length == 0)
	{
	  offset_size = 8;
	  length = read_4_bytes (stash->bfd_ptr, stash->info_ptr + 4, stash->info_ptr_end);
	  stash->info_ptr += 8;
	}
      /* In the absence of the hints above, we assume 32-bit DWARF2
	 offsets even for targets with 64-bit addresses, because:
	   a) most of the time these targets will not have generated
	      more than 2Gb of debug info and so will not need 64-bit
	      offsets,
	 and
	   b) if they do use 64-bit offsets but they are not using
	      the size hints that are tested for above then they are
	      not conforming to the DWARF3 standard anyway.  */
      else if (addr_size == 8)
	{
	  offset_size = 4;
	  stash->info_ptr += 4;
	}
      else
	stash->info_ptr += 4;

      if (length > 0)
	{
	  bfd_byte * new_ptr;

	  /* PR 21151  */
	  if (stash->info_ptr + length > stash->info_ptr_end)
	    return FALSE;

	  each = parse_comp_unit (stash, length, info_ptr_unit,
				  offset_size);
	  if (!each)
	    /* The dwarf information is damaged, don't trust it any
	       more.  */
	    break;

	  new_ptr = stash->info_ptr + length;
	  /* PR 17512: file: 1500698c.  */
	  if (new_ptr < stash->info_ptr)
	    {
	      /* A corrupt length value - do not trust the info any more.  */
	      found = FALSE;
	      break;
	    }
	  else
	    stash->info_ptr = new_ptr;

	  if (stash->all_comp_units)
	    stash->all_comp_units->prev_unit = each;
	  else
	    stash->last_comp_unit = each;

	  each->next_unit = stash->all_comp_units;
	  stash->all_comp_units = each;

	  /* DW_AT_low_pc and DW_AT_high_pc are optional for
	     compilation units.  If we don't have them (i.e.,
	     unit->high == 0), we need to consult the line info table
	     to see if a compilation unit contains the given
	     address.  */
	  if (do_line)
	    found = (((symbol->flags & BSF_FUNCTION) == 0
		      || each->arange.high == 0
		      || comp_unit_contains_address (each, addr))
		     && comp_unit_find_line (each, symbol, addr,
					     filename_ptr,
					     linenumber_ptr,
					     stash));
	  else
	    found = ((each->arange.high == 0
		      || comp_unit_contains_address (each, addr))
		     && comp_unit_find_nearest_line (each, addr,
						     filename_ptr,
						     &function,
						     linenumber_ptr,
						     discriminator_ptr,
						     stash) != 0);

	  if ((bfd_vma) (stash->info_ptr - stash->sec_info_ptr)
	      == stash->sec->size)
	    {
	      stash->sec = find_debug_info (stash->bfd_ptr, debug_sections,
					    stash->sec);
	      stash->sec_info_ptr = stash->info_ptr;
	    }

	  if (found)
	    goto done;
	}
    }

 done:
  if (function)
    {
      if (!function->is_linkage)
	{
	  asymbol *fun;
	  bfd_vma sec_vma;

	  fun = _bfd_elf_find_function (abfd, symbols, section, offset,
					*filename_ptr ? NULL : filename_ptr,
					functionname_ptr);
	  sec_vma = section->vma;
	  if (section->output_section != NULL)
	    sec_vma = section->output_section->vma + section->output_offset;
	  if (fun != NULL
	      && fun->value + sec_vma == function->arange.low)
	    function->name = *functionname_ptr;
	  /* Even if we didn't find a linkage name, say that we have
	     to stop a repeated search of symbols.  */
	  function->is_linkage = TRUE;
	}
      *functionname_ptr = function->name;
    }
  if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
    unset_sections (stash);

  return found;
}

bfd_boolean
_bfd_dwarf2_find_inliner_info (bfd *abfd ATTRIBUTE_UNUSED,
			       const char **filename_ptr,
			       const char **functionname_ptr,
			       unsigned int *linenumber_ptr,
			       void **pinfo)
{
  struct dwarf2_debug *stash;

  stash = (struct dwarf2_debug *) *pinfo;
  if (stash)
    {
      struct funcinfo *func = stash->inliner_chain;

      if (func && func->caller_func)
	{
	  *filename_ptr = func->caller_file;
	  *functionname_ptr = func->caller_func->name;
	  *linenumber_ptr = func->caller_line;
	  stash->inliner_chain = func->caller_func;
	  return TRUE;
	}
    }

  return FALSE;
}

void
_bfd_dwarf2_cleanup_debug_info (bfd *abfd, void **pinfo)
{
  struct dwarf2_debug *stash = (struct dwarf2_debug *) *pinfo;
  struct comp_unit *each;

  if (abfd == NULL || stash == NULL)
    return;

  for (each = stash->all_comp_units; each; each = each->next_unit)
    {
      struct abbrev_info **abbrevs = each->abbrevs;
      struct funcinfo *function_table = each->function_table;
      struct varinfo *variable_table = each->variable_table;
      size_t i;

      for (i = 0; i < ABBREV_HASH_SIZE; i++)
	{
	  struct abbrev_info *abbrev = abbrevs[i];

	  while (abbrev)
	    {
	      free (abbrev->attrs);
	      abbrev = abbrev->next;
	    }
	}

      if (each->line_table)
	{
	  free (each->line_table->dirs);
	  free (each->line_table->files);
	}

      while (function_table)
	{
	  if (function_table->file)
	    {
	      free (function_table->file);
	      function_table->file = NULL;
	    }

	  if (function_table->caller_file)
	    {
	      free (function_table->caller_file);
	      function_table->caller_file = NULL;
	    }
	  function_table = function_table->prev_func;
	}

      if (each->lookup_funcinfo_table)
	{
	  free (each->lookup_funcinfo_table);
	  each->lookup_funcinfo_table = NULL;
	}

      while (variable_table)
	{
	  if (variable_table->file)
	    {
	      free (variable_table->file);
	      variable_table->file = NULL;
	    }

	  variable_table = variable_table->prev_var;
	}
    }

  if (stash->dwarf_abbrev_buffer)
    free (stash->dwarf_abbrev_buffer);
  if (stash->dwarf_line_buffer)
    free (stash->dwarf_line_buffer);
  if (stash->dwarf_str_buffer)
    free (stash->dwarf_str_buffer);
  if (stash->dwarf_line_str_buffer)
    free (stash->dwarf_line_str_buffer);
  if (stash->dwarf_ranges_buffer)
    free (stash->dwarf_ranges_buffer);
  if (stash->info_ptr_memory)
    free (stash->info_ptr_memory);
  if (stash->close_on_cleanup)
    bfd_close (stash->bfd_ptr);
  if (stash->alt_dwarf_str_buffer)
    free (stash->alt_dwarf_str_buffer);
  if (stash->alt_dwarf_info_buffer)
    free (stash->alt_dwarf_info_buffer);
  if (stash->sec_vma)
    free (stash->sec_vma);
  if (stash->adjusted_sections)
    free (stash->adjusted_sections);
  if (stash->alt_bfd_ptr)
    bfd_close (stash->alt_bfd_ptr);
}

/* Find the function to a particular section and offset,
   for error reporting.  */

asymbol *
_bfd_elf_find_function (bfd *abfd,
			asymbol **symbols,
			asection *section,
			bfd_vma offset,
			const char **filename_ptr,
			const char **functionname_ptr)
{
  struct elf_find_function_cache
  {
    asection *last_section;
    asymbol *func;
    const char *filename;
    bfd_size_type func_size;
  } *cache;

  if (symbols == NULL)
    return NULL;

  if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
    return NULL;

  cache = elf_tdata (abfd)->elf_find_function_cache;
  if (cache == NULL)
    {
      cache = bfd_zalloc (abfd, sizeof (*cache));
      elf_tdata (abfd)->elf_find_function_cache = cache;
      if (cache == NULL)
	return NULL;
    }
  if (cache->last_section != section
      || cache->func == NULL
      || offset < cache->func->value
      || offset >= cache->func->value + cache->func_size)
    {
      asymbol *file;
      bfd_vma low_func;
      asymbol **p;
      /* ??? Given multiple file symbols, it is impossible to reliably
	 choose the right file name for global symbols.  File symbols are
	 local symbols, and thus all file symbols must sort before any
	 global symbols.  The ELF spec may be interpreted to say that a
	 file symbol must sort before other local symbols, but currently
	 ld -r doesn't do this.  So, for ld -r output, it is possible to
	 make a better choice of file name for local symbols by ignoring
	 file symbols appearing after a given local symbol.  */
      enum { nothing_seen, symbol_seen, file_after_symbol_seen } state;
      const struct elf_backend_data *bed = get_elf_backend_data (abfd);

      file = NULL;
      low_func = 0;
      state = nothing_seen;
      cache->filename = NULL;
      cache->func = NULL;
      cache->func_size = 0;
      cache->last_section = section;

      for (p = symbols; *p != NULL; p++)
	{
	  asymbol *sym = *p;
	  bfd_vma code_off;
	  bfd_size_type size;

	  if ((sym->flags & BSF_FILE) != 0)
	    {
	      file = sym;
	      if (state == symbol_seen)
		state = file_after_symbol_seen;
	      continue;
	    }

	  size = bed->maybe_function_sym (sym, section, &code_off);
	  if (size != 0
	      && code_off <= offset
	      && (code_off > low_func
		  || (code_off == low_func
		      && size > cache->func_size)))
	    {
	      cache->func = sym;
	      cache->func_size = size;
	      cache->filename = NULL;
	      low_func = code_off;
	      if (file != NULL
		  && ((sym->flags & BSF_LOCAL) != 0
		      || state != file_after_symbol_seen))
		cache->filename = bfd_asymbol_name (file);
	    }
	  if (state == nothing_seen)
	    state = symbol_seen;
	}
    }

  if (cache->func == NULL)
    return NULL;

  if (filename_ptr)
    *filename_ptr = cache->filename;
  if (functionname_ptr)
    *functionname_ptr = bfd_asymbol_name (cache->func);

  return cache->func;
}