summaryrefslogtreecommitdiff
path: root/gcc/config/darwin.c
blob: ea056a9ab9d14af59dc6b3897f05cfb2bef10002 (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
/* Functions for generic Darwin as target machine for GNU C compiler.
   Copyright (C) 1989-2013 Free Software Foundation, Inc.
   Contributed by Apple Computer Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "insn-config.h"
#include "conditions.h"
#include "insn-flags.h"
#include "output.h"
#include "insn-attr.h"
#include "flags.h"
#include "tree.h"
#include "stringpool.h"
#include "varasm.h"
#include "stor-layout.h"
#include "expr.h"
#include "reload.h"
#include "function.h"
#include "ggc.h"
#include "langhooks.h"
#include "target.h"
#include "tm_p.h"
#include "diagnostic-core.h"
#include "toplev.h"
#include "hashtab.h"
#include "df.h"
#include "debug.h"
#include "obstack.h"
#include "pointer-set.h"
#include "hash-table.h"
#include "vec.h"
#include "basic-block.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "gimple-fold.h"
#include "tree-eh.h"
#include "gimple-expr.h"
#include "is-a.h"
#include "gimple.h"
#include "gimplify.h"
#include "lto-streamer.h"

/* Darwin supports a feature called fix-and-continue, which is used
   for rapid turn around debugging.  When code is compiled with the
   -mfix-and-continue flag, two changes are made to the generated code
   that allow the system to do things that it would normally not be
   able to do easily.  These changes allow gdb to load in
   recompilation of a translation unit that has been changed into a
   running program and replace existing functions and methods of that
   translation unit with versions of those functions and methods
   from the newly compiled translation unit.  The new functions access
   the existing static symbols from the old translation unit, if the
   symbol existed in the unit to be replaced, and from the new
   translation unit, otherwise.

   The changes are to insert 5 nops at the beginning of all functions
   and to use indirection to get at static symbols.  The 5 nops
   are required by consumers of the generated code.  Currently, gdb
   uses this to patch in a jump to the overriding function, this
   allows all uses of the old name to forward to the replacement,
   including existing function pointers and virtual methods.  See
   rs6000_emit_prologue for the code that handles the nop insertions.

   The added indirection allows gdb to redirect accesses to static
   symbols from the newly loaded translation unit to the existing
   symbol, if any.  @code{static} symbols are special and are handled by
   setting the second word in the .non_lazy_symbol_pointer data
   structure to symbol.  See indirect_data for the code that handles
   the extra indirection, and machopic_output_indirection and its use
   of MACHO_SYMBOL_STATIC for the code that handles @code{static}
   symbol indirection.  */

/* For darwin >= 9  (OSX 10.5) the linker is capable of making the necessary
   branch islands and we no longer need to emit darwin stubs.
   However, if we are generating code for earlier systems (or for use in the 
   kernel) the stubs might still be required, and this will be set true.  */
int darwin_emit_branch_islands = false;

typedef struct GTY(()) cdtor_record {
  rtx symbol;
  int priority;		/* [con/de]structor priority */
  int position;		/* original position */
} cdtor_record;

static GTY(()) vec<cdtor_record, va_gc> *ctors = NULL;
static GTY(()) vec<cdtor_record, va_gc> *dtors = NULL;

/* A flag to determine whether we are running c++ or obj-c++.  This has to be
   settable from non-c-family contexts too (i.e. we can't use the c_dialect_
   functions).  */
int darwin_running_cxx;

/* Some code-gen now depends on OS major version numbers (at least).  */
int generating_for_darwin_version ;

/* Section names.  */
section * darwin_sections[NUM_DARWIN_SECTIONS];

/* While we transition to using in-tests instead of ifdef'd code.  */
#ifndef HAVE_lo_sum
#define HAVE_lo_sum 0
#define gen_macho_high(a,b) (a)
#define gen_macho_low(a,b,c) (a)
#endif

/* True if we're setting __attribute__ ((ms_struct)).  */
int darwin_ms_struct = false;

/* Earlier versions of Darwin as do not recognize an alignment field in 
   .comm directives, this should be set for versions that allow it.  */
int emit_aligned_common = false;

/* A get_unnamed_section callback used to switch to an ObjC section.
   DIRECTIVE is as for output_section_asm_op.  */

static void
output_objc_section_asm_op (const void *directive)
{
  static bool been_here = false;

  /* The NeXT ObjC Runtime requires these sections to be present and in 
     order in the object.  The code below implements this by emitting 
     a section header for each ObjC section the first time that an ObjC
     section is requested.  */
  if (! been_here)
    {
      section *saved_in_section = in_section;
      static const enum darwin_section_enum tomark[] =
	{
	  /* written, cold -> hot */
	  objc_cat_cls_meth_section,
	  objc_cat_inst_meth_section,
	  objc_string_object_section,
	  objc_constant_string_object_section,
	  objc_selector_refs_section,
	  objc_selector_fixup_section,
	  objc_cls_refs_section,
	  objc_class_section,
	  objc_meta_class_section,
	  /* shared, hot -> cold */
	  objc_cls_meth_section,
	  objc_inst_meth_section,
	  objc_protocol_section,
	  objc_class_names_section,
	  objc_meth_var_types_section,
	  objc_meth_var_names_section,
	  objc_category_section,
	  objc_class_vars_section,
	  objc_instance_vars_section,
	  objc_module_info_section,
	  objc_symbols_section,
	};
      /* ABI=1 */
      static const enum darwin_section_enum tomarkv1[] =
	{
	  objc1_protocol_ext_section,
	  objc1_class_ext_section,
	  objc1_prop_list_section
	} ;
      /* ABI=2 */
      static const enum darwin_section_enum tomarkv2[] =
	{
	  objc2_message_refs_section,
	  objc2_classdefs_section,
	  objc2_metadata_section,
	  objc2_classrefs_section,
	  objc2_classlist_section,
	  objc2_categorylist_section,
	  objc2_selector_refs_section,
	  objc2_nonlazy_class_section,
	  objc2_nonlazy_category_section,
	  objc2_protocollist_section,
	  objc2_protocolrefs_section,
	  objc2_super_classrefs_section,
	  objc2_image_info_section,
	  objc2_constant_string_object_section
	} ;
      size_t i;

      been_here = true;
      if (flag_objc_abi < 2)
	{
	  for (i = 0; i < ARRAY_SIZE (tomark); i++)
	    switch_to_section (darwin_sections[tomark[i]]);
	  if (flag_objc_abi == 1)
	    for (i = 0; i < ARRAY_SIZE (tomarkv1); i++)
	      switch_to_section (darwin_sections[tomarkv1[i]]);
	}
      else
	for (i = 0; i < ARRAY_SIZE (tomarkv2); i++)
	  switch_to_section (darwin_sections[tomarkv2[i]]);
      /* Make sure we don't get varasm.c out of sync with us.  */
      switch_to_section (saved_in_section);
    }
  output_section_asm_op (directive);
}


/* Private flag applied to disable section-anchors in a particular section.  */
#define SECTION_NO_ANCHOR SECTION_MACH_DEP


/* Implement TARGET_ASM_INIT_SECTIONS.  */

void
darwin_init_sections (void)
{
#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC)		\
  darwin_sections[NAME] =					\
    get_unnamed_section (FLAGS, (OBJC				\
				 ? output_objc_section_asm_op	\
				 : output_section_asm_op),	\
			 "\t" DIRECTIVE);
#include "config/darwin-sections.def"
#undef DEF_SECTION

  readonly_data_section = darwin_sections[const_section];
  exception_section = darwin_sections[darwin_exception_section];
  eh_frame_section = darwin_sections[darwin_eh_frame_section];
}

int
name_needs_quotes (const char *name)
{
  int c;
  while ((c = *name++) != '\0')
    if (! ISIDNUM (c) 
	  && c != '.' && c != '$' && c != '_' )
      return 1;
  return 0;
}

/* Return true if SYM_REF can be used without an indirection.  */
int
machopic_symbol_defined_p (rtx sym_ref)
{
  if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
    return true;

  /* If a symbol references local and is not an extern to this
     file, then the symbol might be able to declared as defined.  */
  if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
    {
      /* If the symbol references a variable and the variable is a
	 common symbol, then this symbol is not defined.  */
      if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
	{
	  tree decl = SYMBOL_REF_DECL (sym_ref);
	  if (!decl)
	    return true;
	  if (DECL_COMMON (decl))
	    return false;
	}
      return true;
    }
  return false;
}

/* This module assumes that (const (symbol_ref "foo")) is a legal pic
   reference, which will not be changed.  */

enum machopic_addr_class
machopic_classify_symbol (rtx sym_ref)
{
  bool function_p;

  function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
  if (machopic_symbol_defined_p (sym_ref))
    return (function_p
	    ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
  else
    return (function_p
	    ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
}

#ifndef TARGET_FIX_AND_CONTINUE
#define TARGET_FIX_AND_CONTINUE 0
#endif

/* Indicate when fix-and-continue style code generation is being used
   and when a reference to data should be indirected so that it can be
   rebound in a new translation unit to reference the original instance
   of that data.  Symbol names that are for code generation local to
   the translation unit are bound to the new translation unit;
   currently this means symbols that begin with L or _OBJC_;
   otherwise, we indicate that an indirect reference should be made to
   permit the runtime to rebind new instances of the translation unit
   to the original instance of the data.  */

static int
indirect_data (rtx sym_ref)
{
  int lprefix;
  const char *name;

  /* If we aren't generating fix-and-continue code, don't do anything
     special.  */
  if (TARGET_FIX_AND_CONTINUE == 0)
    return 0;

  /* Otherwise, all symbol except symbols that begin with L or _OBJC_
     are indirected.  Symbols that begin with L and _OBJC_ are always
     bound to the current translation unit as they are used for
     generated local data of the translation unit.  */

  name = XSTR (sym_ref, 0);

  lprefix = (((name[0] == '*' || name[0] == '&')
              && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
             || (strncmp (name, "_OBJC_", 6) == 0));

  return ! lprefix;
}

static int
machopic_data_defined_p (rtx sym_ref)
{
  if (indirect_data (sym_ref))
    return 0;

  switch (machopic_classify_symbol (sym_ref))
    {
    case MACHOPIC_DEFINED_DATA:
    case MACHOPIC_DEFINED_FUNCTION:
      return 1;
    default:
      return 0;
    }
}

void
machopic_define_symbol (rtx mem)
{
  rtx sym_ref;

  gcc_assert (GET_CODE (mem) == MEM);
  sym_ref = XEXP (mem, 0);
  SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
}

/* Return either ORIG or:

     (const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET))

   depending on MACHO_DYNAMIC_NO_PIC_P.  */
rtx
machopic_gen_offset (rtx orig)
{
  if (MACHO_DYNAMIC_NO_PIC_P)
    return orig;
  else
    {
      /* Play games to avoid marking the function as needing pic if we
	 are being called as part of the cost-estimation process.  */
      if (current_ir_type () != IR_GIMPLE || currently_expanding_to_rtl)
	crtl->uses_pic_offset_table = 1;
      orig = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, orig),
			     UNSPEC_MACHOPIC_OFFSET);
      return gen_rtx_CONST (Pmode, orig);
    }
}

static GTY(()) const char * function_base_func_name;
static GTY(()) int current_pic_label_num;
static GTY(()) int emitted_pic_label_num;

static void
update_pic_label_number_if_needed (void)
{
  const char *current_name;

  /* When we are generating _get_pc thunks within stubs, there is no current
     function.  */
  if (current_function_decl)
    {
      current_name =
	IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
      if (function_base_func_name != current_name)
	{
	  ++current_pic_label_num;
	  function_base_func_name = current_name;
	}
    }
  else
    {
      ++current_pic_label_num;
      function_base_func_name = "L_machopic_stub_dummy";
    }
}

void
machopic_output_function_base_name (FILE *file)
{
  /* If dynamic-no-pic is on, we should not get here.  */
  gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);

  update_pic_label_number_if_needed ();
  fprintf (file, "L%d$pb", current_pic_label_num);
}

char curr_picbasename[32];

const char *
machopic_get_function_picbase (void)
{
  /* If dynamic-no-pic is on, we should not get here.  */
  gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);

  update_pic_label_number_if_needed ();
  snprintf (curr_picbasename, 32, "L%d$pb", current_pic_label_num);
  return (const char *) curr_picbasename;
}

bool
machopic_should_output_picbase_label (void)
{
  update_pic_label_number_if_needed ();

  if (current_pic_label_num == emitted_pic_label_num)
    return false;

  emitted_pic_label_num = current_pic_label_num;
  return true;
}

/* The suffix attached to non-lazy pointer symbols.  */
#define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
/* The suffix attached to stub symbols.  */
#define STUB_SUFFIX "$stub"

typedef struct GTY (()) machopic_indirection
{
  /* The SYMBOL_REF for the entity referenced.  */
  rtx symbol;
  /* The name of the stub or non-lazy pointer.  */
  const char * ptr_name;
  /* True iff this entry is for a stub (as opposed to a non-lazy
     pointer).  */
  bool stub_p;
  /* True iff this stub or pointer pointer has been referenced.  */
  bool used;
} machopic_indirection;

/* A table mapping stub names and non-lazy pointer names to
   SYMBOL_REFs for the stubbed-to and pointed-to entities.  */

static GTY ((param_is (struct machopic_indirection))) htab_t
  machopic_indirections;

/* Return a hash value for a SLOT in the indirections hash table.  */

static hashval_t
machopic_indirection_hash (const void *slot)
{
  const machopic_indirection *p = (const machopic_indirection *) slot;
  return htab_hash_string (p->ptr_name);
}

/* Returns true if the KEY is the same as that associated with
   SLOT.  */

static int
machopic_indirection_eq (const void *slot, const void *key)
{
  return strcmp (((const machopic_indirection *) slot)->ptr_name,
		 (const char *) key) == 0;
}

/* Return the name of the non-lazy pointer (if STUB_P is false) or
   stub (if STUB_B is true) corresponding to the given name.  */

const char *
machopic_indirection_name (rtx sym_ref, bool stub_p)
{
  char *buffer;
  const char *name = XSTR (sym_ref, 0);
  size_t namelen = strlen (name);
  machopic_indirection *p;
  void ** slot;
  bool needs_quotes;
  const char *suffix;
  const char *prefix = user_label_prefix;
  const char *quote = "";
  tree id;

  id = maybe_get_identifier (name);
  if (id)
    {
      tree id_orig = id;

      while (IDENTIFIER_TRANSPARENT_ALIAS (id))
	id = TREE_CHAIN (id);
      if (id != id_orig)
	{
	  name = IDENTIFIER_POINTER (id);
	  namelen = strlen (name);
	}
    }

  if (name[0] == '*')
    {
      prefix = "";
      ++name;
      --namelen;
    }

  needs_quotes = name_needs_quotes (name);
  if (needs_quotes)
    {
      quote = "\"";
    }

  if (stub_p)
    suffix = STUB_SUFFIX;
  else
    suffix = NON_LAZY_POINTER_SUFFIX;

  buffer = XALLOCAVEC (char, strlen ("&L")
		   + strlen (prefix)
		   + namelen
		   + strlen (suffix)
		   + 2 * strlen (quote)
		   + 1 /* '\0' */);

  /* Construct the name of the non-lazy pointer or stub.  */
  sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);

  if (!machopic_indirections)
    machopic_indirections = htab_create_ggc (37,
					     machopic_indirection_hash,
					     machopic_indirection_eq,
					     /*htab_del=*/NULL);

  slot = htab_find_slot_with_hash (machopic_indirections, buffer,
				   htab_hash_string (buffer), INSERT);
  if (*slot)
    {
      p = (machopic_indirection *) *slot;
    }
  else
    {
      p = ggc_alloc_machopic_indirection ();
      p->symbol = sym_ref;
      p->ptr_name = xstrdup (buffer);
      p->stub_p = stub_p;
      p->used = false;
      *slot = p;
    }

  return p->ptr_name;
}

/* Return the name of the stub for the mcount function.  */

const char*
machopic_mcount_stub_name (void)
{
  rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
  return machopic_indirection_name (symbol, /*stub_p=*/true);
}

/* If NAME is the name of a stub or a non-lazy pointer , mark the stub
   or non-lazy pointer as used -- and mark the object to which the
   pointer/stub refers as used as well, since the pointer/stub will
   emit a reference to it.  */

void
machopic_validate_stub_or_non_lazy_ptr (const char *name)
{
  machopic_indirection *p;

  p = ((machopic_indirection *)
       (htab_find_with_hash (machopic_indirections, name,
			     htab_hash_string (name))));
  if (p && ! p->used)
    {
      const char *real_name;
      tree id;

      p->used = true;

      /* Do what output_addr_const will do when we actually call it.  */
      if (SYMBOL_REF_DECL (p->symbol))
	mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));

      real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));

      id = maybe_get_identifier (real_name);
      if (id)
	mark_referenced (id);
    }
}

/* Transform ORIG, which may be any data source, to the corresponding
   source using indirections.  */

rtx
machopic_indirect_data_reference (rtx orig, rtx reg)
{
  rtx ptr_ref = orig;

  if (! MACHOPIC_INDIRECT)
    return orig;

  if (GET_CODE (orig) == SYMBOL_REF)
    {
      int defined = machopic_data_defined_p (orig);

      if (defined && MACHO_DYNAMIC_NO_PIC_P)
	{
	  if (DARWIN_PPC)
	    {
	  /* Create a new register for CSE opportunities.  */
	  rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
 	  emit_insn (gen_macho_high (hi_reg, orig));
 	  emit_insn (gen_macho_low (reg, hi_reg, orig));
	      return reg;
 	    }
	  else if (DARWIN_X86)
	    return orig;
	  else
	   /* some other cpu -- writeme!  */
	   gcc_unreachable ();
	}
      else if (defined)
	{
	  rtx offset = NULL;
	  if (DARWIN_PPC || HAVE_lo_sum)
	    offset = machopic_gen_offset (orig);

	  if (DARWIN_PPC)
	    {
	  rtx hi_sum_reg = (!can_create_pseudo_p ()
			    ? reg
			    : gen_reg_rtx (Pmode));

	  gcc_assert (reg);

	  emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
			      gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
				       gen_rtx_HIGH (Pmode, offset))));
	  emit_insn (gen_rtx_SET (Pmode, reg,
				  gen_rtx_LO_SUM (Pmode, hi_sum_reg,
						  copy_rtx (offset))));

	  orig = reg;
	    }
	  else if (HAVE_lo_sum)
	    {
	  gcc_assert (reg);

	  emit_insn (gen_rtx_SET (VOIDmode, reg,
				  gen_rtx_HIGH (Pmode, offset)));
	  emit_insn (gen_rtx_SET (VOIDmode, reg,
				  gen_rtx_LO_SUM (Pmode, reg,
						  copy_rtx (offset))));
	  emit_use (pic_offset_table_rtx);

	  orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
	    }
	  return orig;
	}

      ptr_ref = (gen_rtx_SYMBOL_REF
		 (Pmode,
		  machopic_indirection_name (orig, /*stub_p=*/false)));

      SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);

      ptr_ref = gen_const_mem (Pmode, ptr_ref);
      machopic_define_symbol (ptr_ref);

      if (DARWIN_X86 
          && reg 
          && MACHO_DYNAMIC_NO_PIC_P)
	{
	    emit_insn (gen_rtx_SET (Pmode, reg, ptr_ref));
	    ptr_ref = reg;
	}

      return ptr_ref;
    }
  else if (GET_CODE (orig) == CONST)
    {
      /* If "(const (plus ...", walk the PLUS and return that result.
	 PLUS processing (below) will restore the "(const ..." if
	 appropriate.  */
      if (GET_CODE (XEXP (orig, 0)) == PLUS)
	return machopic_indirect_data_reference (XEXP (orig, 0), reg);
      else 
	return orig;
    }
  else if (GET_CODE (orig) == MEM)
    {
      XEXP (ptr_ref, 0) = 
		machopic_indirect_data_reference (XEXP (orig, 0), reg);
      return ptr_ref;
    }
  else if (GET_CODE (orig) == PLUS)
    {
      rtx base, result;
      /* When the target is i386, this code prevents crashes due to the
	compiler's ignorance on how to move the PIC base register to
	other registers.  (The reload phase sometimes introduces such
	insns.)  */
      if (GET_CODE (XEXP (orig, 0)) == REG
	   && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
	   /* Prevent the same register from being erroneously used
	      as both the base and index registers.  */
	   && (DARWIN_X86 && (GET_CODE (XEXP (orig, 1)) == CONST))
	   && reg)
	{
	  emit_move_insn (reg, XEXP (orig, 0));
	  XEXP (ptr_ref, 0) = reg;
	  return ptr_ref;
	}

      /* Legitimize both operands of the PLUS.  */
      base = machopic_indirect_data_reference (XEXP (orig, 0), reg);
      orig = machopic_indirect_data_reference (XEXP (orig, 1),
					       (base == reg ? 0 : reg));
      if (MACHOPIC_INDIRECT && (GET_CODE (orig) == CONST_INT))
	result = plus_constant (Pmode, base, INTVAL (orig));
      else
	result = gen_rtx_PLUS (Pmode, base, orig);

      if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
	{
	  if (reg)
	    {
	      emit_move_insn (reg, result);
	      result = reg;
	    }
	  else
	    {
	      result = force_reg (GET_MODE (result), result);
	    }
	}

      return result;
    }
  return ptr_ref;
}

/* Transform TARGET (a MEM), which is a function call target, to the
   corresponding symbol_stub if necessary.  Return a new MEM.  */

rtx
machopic_indirect_call_target (rtx target)
{
  if (! darwin_emit_branch_islands)
    return target;

  if (GET_CODE (target) != MEM)
    return target;

  if (MACHOPIC_INDIRECT
      && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
      && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
	   & MACHO_SYMBOL_FLAG_DEFINED))
    {
      rtx sym_ref = XEXP (target, 0);
      const char *stub_name = machopic_indirection_name (sym_ref,
							 /*stub_p=*/true);
      enum machine_mode mode = GET_MODE (sym_ref);

      XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
      SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
      MEM_READONLY_P (target) = 1;
      MEM_NOTRAP_P (target) = 1;
    }

  return target;
}

rtx
machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
{
  rtx pic_ref = orig;

  if (! MACHOPIC_INDIRECT)
    return orig;

  /* First handle a simple SYMBOL_REF or LABEL_REF */
  if (GET_CODE (orig) == LABEL_REF
      || (GET_CODE (orig) == SYMBOL_REF
	  ))
    {
      /* addr(foo) = &func+(foo-func) */
      orig = machopic_indirect_data_reference (orig, reg);

      if (GET_CODE (orig) == PLUS
	  && GET_CODE (XEXP (orig, 0)) == REG)
	{
	  if (reg == 0)
	    return force_reg (mode, orig);

	  emit_move_insn (reg, orig);
	  return reg;
	}

      if (GET_CODE (orig) == MEM)
	{
	  if (reg == 0)
	    {
	      gcc_assert (!reload_in_progress);
	      reg = gen_reg_rtx (Pmode);
	    }

#if HAVE_lo_sum
	  if (MACHO_DYNAMIC_NO_PIC_P
	      && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
		  || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
	    {
#if defined (TARGET_TOC)	/* ppc  */
	      rtx temp_reg = (!can_create_pseudo_p ()
			      ? reg :
			      gen_reg_rtx (Pmode));
	      rtx asym = XEXP (orig, 0);
	      rtx mem;

	      emit_insn (gen_macho_high (temp_reg, asym));
	      mem = gen_const_mem (GET_MODE (orig),
				   gen_rtx_LO_SUM (Pmode, temp_reg,
						   copy_rtx (asym)));
	      emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
#else
	      /* Some other CPU -- WriteMe! but right now there are no other
		 platforms that can use dynamic-no-pic  */
	      gcc_unreachable ();
#endif
	      pic_ref = reg;
	    }
	  else
	  if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
	      || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
	    {
	      rtx offset = machopic_gen_offset (XEXP (orig, 0));
#if defined (TARGET_TOC) /* i.e., PowerPC */
	      /* Generating a new reg may expose opportunities for
		 common subexpression elimination.  */
              rtx hi_sum_reg = (!can_create_pseudo_p ()
				? reg
				: gen_reg_rtx (Pmode));
	      rtx mem;
	      rtx insn;
	      rtx sum;

	      sum = gen_rtx_HIGH (Pmode, offset);
	      if (! MACHO_DYNAMIC_NO_PIC_P)
		sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);

	      emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));

	      mem = gen_const_mem (GET_MODE (orig),
				  gen_rtx_LO_SUM (Pmode,
						  hi_sum_reg,
						  copy_rtx (offset)));
	      insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
	      set_unique_reg_note (insn, REG_EQUAL, pic_ref);

	      pic_ref = reg;
#else
	      emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));

	      emit_insn (gen_rtx_SET (VOIDmode, reg,
				      gen_rtx_HIGH (Pmode,
						    gen_rtx_CONST (Pmode,
								   offset))));
	      emit_insn (gen_rtx_SET (VOIDmode, reg,
				  gen_rtx_LO_SUM (Pmode, reg,
					   gen_rtx_CONST (Pmode,
						   	  copy_rtx (offset)))));
	      pic_ref = gen_rtx_PLUS (Pmode,
				      pic_offset_table_rtx, reg);
#endif
	    }
	  else
#endif  /* HAVE_lo_sum */
	    {
	      rtx pic = pic_offset_table_rtx;
	      if (GET_CODE (pic) != REG)
		{
		  emit_move_insn (reg, pic);
		  pic = reg;
		}
#if 0
	      emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));
#endif

	      if (reload_in_progress)
		df_set_regs_ever_live (REGNO (pic), true);
	      pic_ref = gen_rtx_PLUS (Pmode, pic,
				      machopic_gen_offset (XEXP (orig, 0)));
	    }

#if !defined (TARGET_TOC)
	  emit_move_insn (reg, pic_ref);
	  pic_ref = gen_const_mem (GET_MODE (orig), reg);
#endif
	}
      else
	{

#if HAVE_lo_sum
	  if (GET_CODE (orig) == SYMBOL_REF
	      || GET_CODE (orig) == LABEL_REF)
	    {
	      rtx offset = machopic_gen_offset (orig);
#if defined (TARGET_TOC) /* i.e., PowerPC */
              rtx hi_sum_reg;

	      if (reg == 0)
		{
		  gcc_assert (!reload_in_progress);
		  reg = gen_reg_rtx (Pmode);
		}

	      hi_sum_reg = reg;

	      emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
				      (MACHO_DYNAMIC_NO_PIC_P)
				      ? gen_rtx_HIGH (Pmode, offset)
				      : gen_rtx_PLUS (Pmode,
						      pic_offset_table_rtx,
						      gen_rtx_HIGH (Pmode,
								    offset))));
	      emit_insn (gen_rtx_SET (VOIDmode, reg,
				      gen_rtx_LO_SUM (Pmode,
						      hi_sum_reg,
						      copy_rtx (offset))));
	      pic_ref = reg;
#else
	      emit_insn (gen_rtx_SET (VOIDmode, reg,
				      gen_rtx_HIGH (Pmode, offset)));
	      emit_insn (gen_rtx_SET (VOIDmode, reg,
				      gen_rtx_LO_SUM (Pmode, reg,
						      copy_rtx (offset))));
	      pic_ref = gen_rtx_PLUS (Pmode,
				      pic_offset_table_rtx, reg);
#endif
	    }
	  else
#endif  /*  HAVE_lo_sum  */
	    {
	      if (REG_P (orig)
	          || GET_CODE (orig) == SUBREG)
		{
		  return orig;
		}
	      else
		{
		  rtx pic = pic_offset_table_rtx;
		  if (GET_CODE (pic) != REG)
		    {
		      emit_move_insn (reg, pic);
		      pic = reg;
		    }
#if 0
		  emit_use (pic_offset_table_rtx);
#endif
		  if (reload_in_progress)
		    df_set_regs_ever_live (REGNO (pic), true);
		  pic_ref = gen_rtx_PLUS (Pmode,
					  pic,
					  machopic_gen_offset (orig));
		}
	    }
	}

      if (GET_CODE (pic_ref) != REG)
        {
          if (reg != 0)
            {
              emit_move_insn (reg, pic_ref);
              return reg;
            }
          else
            {
              return force_reg (mode, pic_ref);
            }
        }
      else
        {
          return pic_ref;
        }
    }

  else if (GET_CODE (orig) == SYMBOL_REF)
    return orig;

  else if (GET_CODE (orig) == PLUS
	   && (GET_CODE (XEXP (orig, 0)) == MEM
	       || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
	       || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
	   && XEXP (orig, 0) != pic_offset_table_rtx
	   && GET_CODE (XEXP (orig, 1)) != REG)

    {
      rtx base;
      int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);

      base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
      orig = machopic_legitimize_pic_address (XEXP (orig, 1),
					      Pmode, (base == reg ? 0 : reg));
      if (GET_CODE (orig) == CONST_INT)
	{
	  pic_ref = plus_constant (Pmode, base, INTVAL (orig));
	  is_complex = 1;
	}
      else
	pic_ref = gen_rtx_PLUS (Pmode, base, orig);

      if (reg && is_complex)
	{
	  emit_move_insn (reg, pic_ref);
	  pic_ref = reg;
	}
      /* Likewise, should we set special REG_NOTEs here?  */
    }

  else if (GET_CODE (orig) == CONST)
    {
      return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
    }

  else if (GET_CODE (orig) == MEM
	   && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
    {
      rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
      addr = replace_equiv_address (orig, addr);
      emit_move_insn (reg, addr);
      pic_ref = reg;
    }

  return pic_ref;
}

/* Output the stub or non-lazy pointer in *SLOT, if it has been used.
   DATA is the FILE* for assembly output.  Called from
   htab_traverse.  */

static int
machopic_output_indirection (void **slot, void *data)
{
  machopic_indirection *p = *((machopic_indirection **) slot);
  FILE *asm_out_file = (FILE *) data;
  rtx symbol;
  const char *sym_name;
  const char *ptr_name;

  if (!p->used)
    return 1;

  symbol = p->symbol;
  sym_name = XSTR (symbol, 0);
  ptr_name = p->ptr_name;

  if (p->stub_p)
    {
      char *sym;
      char *stub;
      tree id;

      id = maybe_get_identifier (sym_name);
      if (id)
	{
	  tree id_orig = id;

	  while (IDENTIFIER_TRANSPARENT_ALIAS (id))
	    id = TREE_CHAIN (id);
	  if (id != id_orig)
	    sym_name = IDENTIFIER_POINTER (id);
	}

      sym = XALLOCAVEC (char, strlen (sym_name) + 2);
      if (sym_name[0] == '*' || sym_name[0] == '&')
	strcpy (sym, sym_name + 1);
      else if (sym_name[0] == '-' || sym_name[0] == '+')
	strcpy (sym, sym_name);
      else
	sprintf (sym, "%s%s", user_label_prefix, sym_name);

      stub = XALLOCAVEC (char, strlen (ptr_name) + 2);
      if (ptr_name[0] == '*' || ptr_name[0] == '&')
	strcpy (stub, ptr_name + 1);
      else
	sprintf (stub, "%s%s", user_label_prefix, ptr_name);

      machopic_output_stub (asm_out_file, sym, stub);
    }
  else if (! indirect_data (symbol)
	   && (machopic_symbol_defined_p (symbol)
	       || SYMBOL_REF_LOCAL_P (symbol)))
    {
      switch_to_section (data_section);
      assemble_align (GET_MODE_ALIGNMENT (Pmode));
      assemble_label (asm_out_file, ptr_name);
      assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
			GET_MODE_SIZE (Pmode),
			GET_MODE_ALIGNMENT (Pmode), 1);
    }
  else
    {
      rtx init = const0_rtx;

      switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);

      /* Mach-O symbols are passed around in code through indirect
	 references and the original symbol_ref hasn't passed through
	 the generic handling and reference-catching in
	 output_operand, so we need to manually mark weak references
	 as such.  */
      if (SYMBOL_REF_WEAK (symbol))
	{
	  tree decl = SYMBOL_REF_DECL (symbol);
	  gcc_assert (DECL_P (decl));

	  if (decl != NULL_TREE
	      && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)
	      /* Handle only actual external-only definitions, not
		 e.g. extern inline code or variables for which
		 storage has been allocated.  */
	      && !TREE_STATIC (decl))
	    {
	      fputs ("\t.weak_reference ", asm_out_file);
	      assemble_name (asm_out_file, sym_name);
	      fputc ('\n', asm_out_file);
	    }
	}

      assemble_name (asm_out_file, ptr_name);
      fprintf (asm_out_file, ":\n");

      fprintf (asm_out_file, "\t.indirect_symbol ");
      assemble_name (asm_out_file, sym_name);
      fprintf (asm_out_file, "\n");

      /* Variables that are marked with MACHO_SYMBOL_STATIC need to
	 have their symbol name instead of 0 in the second entry of
	 the non-lazy symbol pointer data structure when they are
	 defined.  This allows the runtime to rebind newer instances
	 of the translation unit with the original instance of the
	 symbol.  */

      if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
	  && machopic_symbol_defined_p (symbol))
	init = gen_rtx_SYMBOL_REF (Pmode, sym_name);

      assemble_integer (init, GET_MODE_SIZE (Pmode),
			GET_MODE_ALIGNMENT (Pmode), 1);
    }

  return 1;
}

void
machopic_finish (FILE *asm_out_file)
{
  if (machopic_indirections)
    htab_traverse_noresize (machopic_indirections,
			    machopic_output_indirection,
			    asm_out_file);
}

int
machopic_operand_p (rtx op)
{
  if (MACHOPIC_JUST_INDIRECT)
    return (GET_CODE (op) == SYMBOL_REF
	    && machopic_symbol_defined_p (op));
  else
    return (GET_CODE (op) == CONST
	    && GET_CODE (XEXP (op, 0)) == UNSPEC
	    && XINT (XEXP (op, 0), 1) == UNSPEC_MACHOPIC_OFFSET);
}

/* This function records whether a given name corresponds to a defined
   or undefined function or variable, for machopic_classify_ident to
   use later.  */

void
darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
{
  rtx sym_ref;

  /* Do the standard encoding things first.  */
  default_encode_section_info (decl, rtl, first);

  if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
    return;

  sym_ref = XEXP (rtl, 0);
  if (TREE_CODE (decl) == VAR_DECL)
    SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;

  if (!DECL_EXTERNAL (decl)
      && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
      && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
      && ((TREE_STATIC (decl)
	   && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
	  || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
	      && DECL_INITIAL (decl) != error_mark_node)))
    SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;

  if (! TREE_PUBLIC (decl))
    SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
}

void
darwin_mark_decl_preserved (const char *name)
{
  fprintf (asm_out_file, "\t.no_dead_strip ");
  assemble_name (asm_out_file, name);
  fputc ('\n', asm_out_file);
}

static section *
darwin_rodata_section (int weak, bool zsize)
{
  return (weak
	  ? darwin_sections[const_coal_section]
	  : (zsize ? darwin_sections[zobj_const_section]
		   : darwin_sections[const_section]));
}

static section *
darwin_mergeable_string_section (tree exp,
				 unsigned HOST_WIDE_INT align)
{
  /* Darwin's ld expects to see non-writable string literals in the .cstring 
     section.  Later versions of ld check and complain when CFStrings are 
     enabled.  Therefore we shall force the strings into .cstring since we
     don't support writable ones anyway.  */
  if ((darwin_constant_cfstrings || flag_merge_constants)
      && TREE_CODE (exp) == STRING_CST
      && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
      && align <= 256
      && (int_size_in_bytes (TREE_TYPE (exp))
	  == TREE_STRING_LENGTH (exp))
      && ((size_t) TREE_STRING_LENGTH (exp)
	  == strlen (TREE_STRING_POINTER (exp)) + 1))
    return darwin_sections[cstring_section];

  if (DARWIN_SECTION_ANCHORS && flag_section_anchors
      && TREE_CODE (exp) == STRING_CST
      && TREE_STRING_LENGTH (exp) == 0)
    return darwin_sections[zobj_const_section];

  return readonly_data_section;
}

#ifndef HAVE_GAS_LITERAL16
#define HAVE_GAS_LITERAL16 0
#endif

static section *
darwin_mergeable_constant_section (tree exp,
				   unsigned HOST_WIDE_INT align,
				   bool zsize)
{
  enum machine_mode mode = DECL_MODE (exp);
  unsigned int modesize = GET_MODE_BITSIZE (mode);

  if (DARWIN_SECTION_ANCHORS 
      && flag_section_anchors 
      && zsize)
    return darwin_sections[zobj_const_section];

  if (flag_merge_constants
      && mode != VOIDmode
      && mode != BLKmode
      && modesize <= align
      && align >= 8
      && align <= 256
      && (align & (align -1)) == 0)
    {
      tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));

      if (TREE_CODE (size) == INTEGER_CST
	  && TREE_INT_CST_LOW (size) == 4
	  && TREE_INT_CST_HIGH (size) == 0)
        return darwin_sections[literal4_section];
      else if (TREE_CODE (size) == INTEGER_CST
	       && TREE_INT_CST_LOW (size) == 8
	       && TREE_INT_CST_HIGH (size) == 0)
        return darwin_sections[literal8_section];
      else if (HAVE_GAS_LITERAL16
	       && TARGET_64BIT
               && TREE_CODE (size) == INTEGER_CST
               && TREE_INT_CST_LOW (size) == 16
               && TREE_INT_CST_HIGH (size) == 0)
        return darwin_sections[literal16_section];
      else
        return readonly_data_section;
    }

  return readonly_data_section;
}

section *
darwin_tm_clone_table_section (void)
{
  return get_named_section (NULL,
			    "__DATA,__tm_clone_table,regular,no_dead_strip",
			    3);
}

int
machopic_reloc_rw_mask (void)
{
  return MACHOPIC_INDIRECT ? 3 : 0;
}

/* We have to deal with ObjC/C++ metadata section placement in the common
   code, since it will also be called from LTO.
   
   Return metadata attributes, if present (searching for ABI=2 first)
   Return NULL_TREE if no such attributes are found.  */

static tree
is_objc_metadata (tree decl)
{
  if (DECL_P (decl) 
      && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
      && DECL_ATTRIBUTES (decl))
    {
      tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
      if (meta)
	return meta;
      meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
      if (meta)
	return meta;
    }
  return NULL_TREE;
}

static int classes_seen;
static int objc_metadata_seen;

/* Return the section required for Objective C ABI 2 metadata.  */
static section *
darwin_objc2_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
{
  const char *p;
  tree ident = TREE_VALUE (meta);
  gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
  p = IDENTIFIER_POINTER (ident);

  gcc_checking_assert (flag_next_runtime == 1 && flag_objc_abi == 2);

  objc_metadata_seen = 1;

  if (base == data_section)
    base = darwin_sections[objc2_metadata_section];

  /* Most of the OBJC2 META-data end up in the base section, so check it
     first.  */
  if      (!strncmp (p, "V2_BASE", 7))
    return base;
  else if (!strncmp (p, "V2_STRG", 7))
    return darwin_sections[cstring_section];

  else if (!strncmp (p, "G2_META", 7) || !strncmp (p, "G2_CLAS", 7))
    return darwin_sections[objc2_classdefs_section];
  else if (!strncmp (p, "V2_MREF", 7))
    return darwin_sections[objc2_message_refs_section];
  else if (!strncmp (p, "V2_CLRF", 7))
    return darwin_sections[objc2_classrefs_section];
  else if (!strncmp (p, "V2_SURF", 7))
    return darwin_sections[objc2_super_classrefs_section];
  else if (!strncmp (p, "V2_NLCL", 7))
    return darwin_sections[objc2_nonlazy_class_section];
  else if (!strncmp (p, "V2_CLAB", 7))
    {
      classes_seen = 1;
      return darwin_sections[objc2_classlist_section];
    }
  else if (!strncmp (p, "V2_SRFS", 7))
    return darwin_sections[objc2_selector_refs_section];
  else if (!strncmp (p, "V2_NLCA", 7))
    return darwin_sections[objc2_nonlazy_category_section];
  else if (!strncmp (p, "V2_CALA", 7))
    return darwin_sections[objc2_categorylist_section];

  else if (!strncmp (p, "V2_PLST", 7))
    return darwin_sections[objc2_protocollist_section];
  else if (!strncmp (p, "V2_PRFS", 7))
    return darwin_sections[objc2_protocolrefs_section];

  else if (!strncmp (p, "V2_INFO", 7))
    return darwin_sections[objc2_image_info_section];

  else if (!strncmp (p, "V2_EHTY", 7))
    return darwin_sections[data_coal_section];

  else if (!strncmp (p, "V2_CSTR", 7))
    return darwin_sections[objc2_constant_string_object_section];

  /* Not recognized, default.  */
  return base;
}

/* Return the section required for Objective C ABI 0/1 metadata.  */
static section *
darwin_objc1_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
{
  const char *p;
  tree ident = TREE_VALUE (meta);
  gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
  p = IDENTIFIER_POINTER (ident);

  gcc_checking_assert (flag_next_runtime == 1 && flag_objc_abi < 2);

  objc_metadata_seen = 1;

  /* String sections first, cos there are lots of strings.  */
  if      (!strncmp (p, "V1_STRG", 7))
    return darwin_sections[cstring_section];
  else if (!strncmp (p, "V1_CLSN", 7))
    return darwin_sections[objc_class_names_section];
  else if (!strncmp (p, "V1_METN", 7))
    return darwin_sections[objc_meth_var_names_section];
  else if (!strncmp (p, "V1_METT", 7))
    return darwin_sections[objc_meth_var_types_section];

  else if (!strncmp (p, "V1_CLAS", 7))
    {
      classes_seen = 1;
      return darwin_sections[objc_class_section];
    }
  else if (!strncmp (p, "V1_META", 7))
    return darwin_sections[objc_meta_class_section];
  else if (!strncmp (p, "V1_CATG", 7))
    return darwin_sections[objc_category_section];
  else if (!strncmp (p, "V1_PROT", 7))
    return darwin_sections[objc_protocol_section];

  else if (!strncmp (p, "V1_CLCV", 7))
    return darwin_sections[objc_class_vars_section];
  else if (!strncmp (p, "V1_CLIV", 7))
    return darwin_sections[objc_instance_vars_section];

  else if (!strncmp (p, "V1_CLCM", 7))
    return darwin_sections[objc_cls_meth_section];
  else if (!strncmp (p, "V1_CLIM", 7))
    return darwin_sections[objc_inst_meth_section];
  else if (!strncmp (p, "V1_CACM", 7))
    return darwin_sections[objc_cat_cls_meth_section];
  else if (!strncmp (p, "V1_CAIM", 7))
    return darwin_sections[objc_cat_inst_meth_section];
  else if (!strncmp (p, "V1_PNSM", 7))
    return darwin_sections[objc_cat_inst_meth_section];
  else if (!strncmp (p, "V1_PCLM", 7))
    return darwin_sections[objc_cat_cls_meth_section];

  else if (!strncmp (p, "V1_CLPR", 7))
    return darwin_sections[objc_cat_cls_meth_section];
  else if (!strncmp (p, "V1_CAPR", 7))
    return darwin_sections[objc_category_section]; /* ??? CHECK me.  */

  else if (!strncmp (p, "V1_PRFS", 7))
    return darwin_sections[objc_cat_cls_meth_section];
  else if (!strncmp (p, "V1_CLRF", 7))
    return darwin_sections[objc_cls_refs_section];
  else if (!strncmp (p, "V1_SRFS", 7))
    return darwin_sections[objc_selector_refs_section];

  else if (!strncmp (p, "V1_MODU", 7))
    return darwin_sections[objc_module_info_section];
  else if (!strncmp (p, "V1_SYMT", 7))
    return darwin_sections[objc_symbols_section];
  else if (!strncmp (p, "V1_INFO", 7))
    return darwin_sections[objc_image_info_section];

  else if (!strncmp (p, "V1_PLST", 7))
    return darwin_sections[objc1_prop_list_section];
  else if (!strncmp (p, "V1_PEXT", 7))
    return darwin_sections[objc1_protocol_ext_section];
  else if (!strncmp (p, "V1_CEXT", 7))
    return darwin_sections[objc1_class_ext_section];

  else if (!strncmp (p, "V2_CSTR", 7))
    return darwin_sections[objc_constant_string_object_section];

  return base;
}

section *
machopic_select_section (tree decl,
			 int reloc,
			 unsigned HOST_WIDE_INT align)
{
  bool zsize, one, weak, ro;
  section *base_section = NULL;

  weak = (DECL_P (decl)
	  && DECL_WEAK (decl)
	  && !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl)));

  zsize = (DECL_P (decl) 
	   && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL) 
	   && tree_to_uhwi (DECL_SIZE_UNIT (decl)) == 0);

  one = DECL_P (decl) 
	&& TREE_CODE (decl) == VAR_DECL 
	&& DECL_ONE_ONLY (decl);

  ro = TREE_READONLY (decl) || TREE_CONSTANT (decl) ;

  switch (categorize_decl_for_section (decl, reloc))
    {
    case SECCAT_TEXT:
      gcc_unreachable ();
      break;

    case SECCAT_RODATA:
    case SECCAT_SRODATA:
      base_section = darwin_rodata_section (weak, zsize);
      break;

    case SECCAT_RODATA_MERGE_STR:
      base_section = darwin_mergeable_string_section (decl, align);
      break;

    case SECCAT_RODATA_MERGE_STR_INIT:
      base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
      break;

    case SECCAT_RODATA_MERGE_CONST:
      base_section =  darwin_mergeable_constant_section (decl, align, zsize);
      break;

    case SECCAT_DATA:
    case SECCAT_DATA_REL:
    case SECCAT_DATA_REL_LOCAL:
    case SECCAT_DATA_REL_RO:
    case SECCAT_DATA_REL_RO_LOCAL:
    case SECCAT_SDATA:
    case SECCAT_TDATA:
      if (weak || one)
	{
	  if (ro)
	    base_section = darwin_sections[const_data_coal_section];
	  else 
	    base_section = darwin_sections[data_coal_section];
	}
      else if (DARWIN_SECTION_ANCHORS 
	       && flag_section_anchors
	       && zsize)
	{
	  /* If we're doing section anchors, then punt zero-sized objects into
	     their own sections so that they don't interfere with offset
	     computation for the remaining vars.  This does not need to be done
	     for stuff in mergeable sections, since these are ineligible for 
	     anchors.  */
	  if (ro)
	    base_section = darwin_sections[zobj_const_data_section];
	  else
	    base_section = darwin_sections[zobj_data_section];
	}
      else if (ro)
	base_section = darwin_sections[const_data_section];
      else
	base_section = data_section;
      break;
    case SECCAT_BSS:
    case SECCAT_SBSS:
    case SECCAT_TBSS:
      if (weak || one) 
	base_section = darwin_sections[data_coal_section];
      else
	{
	  if (!TREE_PUBLIC (decl))
	    base_section = lcomm_section;
	  else if (bss_noswitch_section)
	    base_section = bss_noswitch_section;
	  else
	    base_section = data_section;
	}
      break;

    default:
      gcc_unreachable ();
    }

  /* Darwin weird special cases.  
     a) OBJC Meta-data. */
  if (DECL_P (decl) 
      && (TREE_CODE (decl) == VAR_DECL 
	  || TREE_CODE (decl) == CONST_DECL)
      && DECL_ATTRIBUTES (decl))
    {
      tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
      if (meta)
	return darwin_objc2_section (decl, meta, base_section);
      meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
      if (meta)
	return darwin_objc1_section (decl, meta, base_section);
      meta = lookup_attribute ("OBJC1METG", DECL_ATTRIBUTES (decl));
      if (meta)
	return base_section; /* GNU runtime is happy with it all in one pot.  */
    }

  /* b) Constant string objects.  */
  if (TREE_CODE (decl) == CONSTRUCTOR
      && TREE_TYPE (decl)
      && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
      && TYPE_NAME (TREE_TYPE (decl)))
    {
      tree name = TYPE_NAME (TREE_TYPE (decl));
      if (TREE_CODE (name) == TYPE_DECL)
        name = DECL_NAME (name);

      if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
	{
	  if (flag_next_runtime)
	    {
	      if (flag_objc_abi == 2)
		return darwin_sections[objc2_constant_string_object_section];
	      else
		return darwin_sections[objc_constant_string_object_section];
	    }
	  else
	    return darwin_sections[objc_string_object_section];
	}
      else if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_CFString"))
	return darwin_sections[cfstring_constant_object_section];
      else
	return base_section;
    }
  /* c) legacy meta-data selection.  */
  else if (TREE_CODE (decl) == VAR_DECL
	   && DECL_NAME (decl)
	   && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
	   && IDENTIFIER_POINTER (DECL_NAME (decl))
	   && flag_next_runtime
	   && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
    {
      const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
      static bool warned_objc_46 = false;
      /* We shall assert that zero-sized objects are an error in ObjC 
         meta-data.  */
      gcc_assert (tree_to_uhwi (DECL_SIZE_UNIT (decl)) != 0);
      
      /* ??? This mechanism for determining the metadata section is
	 broken when LTO is in use, since the frontend that generated
	 the data is not identified.  We will keep the capability for
	 the short term - in case any non-Objective-C programs are using
	 it to place data in specified sections.  */
      if (!warned_objc_46)
	{
	  location_t loc = DECL_SOURCE_LOCATION (decl);
	  warning_at (loc, 0, "the use of _OBJC_-prefixed variable names"
		      " to select meta-data sections is deprecated at 4.6"
		      " and will be removed in 4.7");
	  warned_objc_46 = true;
	}
      
      if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
        return darwin_sections[objc_cls_meth_section];
      else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
        return darwin_sections[objc_inst_meth_section];
      else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 29))
        return darwin_sections[objc_cat_cls_meth_section];
      else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 32))
        return darwin_sections[objc_cat_inst_meth_section];
      else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
        return darwin_sections[objc_class_vars_section];
      else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
        return darwin_sections[objc_instance_vars_section];
      else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
        return darwin_sections[objc_cat_cls_meth_section];
      else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
        return darwin_sections[objc_class_names_section];
      else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
        return darwin_sections[objc_meth_var_names_section];
      else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
        return darwin_sections[objc_meth_var_types_section];
      else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
        return darwin_sections[objc_cls_refs_section];
      else if (!strncmp (name, "_OBJC_CLASS_", 12))
        return darwin_sections[objc_class_section];
      else if (!strncmp (name, "_OBJC_METACLASS_", 16))
        return darwin_sections[objc_meta_class_section];
      else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
        return darwin_sections[objc_category_section];
      else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
        return darwin_sections[objc_selector_refs_section];
      else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
        return darwin_sections[objc_selector_fixup_section];
      else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
        return darwin_sections[objc_symbols_section];
      else if (!strncmp (name, "_OBJC_MODULES", 13))
        return darwin_sections[objc_module_info_section];
      else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
        return darwin_sections[objc_image_info_section];
      else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
        return darwin_sections[objc_cat_inst_meth_section];
      else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
        return darwin_sections[objc_cat_cls_meth_section];
      else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
        return darwin_sections[objc_cat_cls_meth_section];
      else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
        return darwin_sections[objc_protocol_section];
      else
        return base_section;
    }

  return base_section;
}

/* This can be called with address expressions as "rtx".
   They must go in "const".  */

section *
machopic_select_rtx_section (enum machine_mode mode, rtx x,
			     unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
{
  if (GET_MODE_SIZE (mode) == 8
      && (GET_CODE (x) == CONST_INT
	  || GET_CODE (x) == CONST_DOUBLE))
    return darwin_sections[literal8_section];
  else if (GET_MODE_SIZE (mode) == 4
	   && (GET_CODE (x) == CONST_INT
	       || GET_CODE (x) == CONST_DOUBLE))
    return darwin_sections[literal4_section];
  else if (HAVE_GAS_LITERAL16
	   && TARGET_64BIT
	   && GET_MODE_SIZE (mode) == 16
	   && (GET_CODE (x) == CONST_INT
	       || GET_CODE (x) == CONST_DOUBLE
	       || GET_CODE (x) == CONST_VECTOR))
    return darwin_sections[literal16_section];
  else if (MACHOPIC_INDIRECT
	   && (GET_CODE (x) == SYMBOL_REF
	       || GET_CODE (x) == CONST
	       || GET_CODE (x) == LABEL_REF))
    return darwin_sections[const_data_section];
  else
    return darwin_sections[const_section];
}

void
machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
{
  cdtor_record new_elt = {symbol, priority, vec_safe_length (ctors)};

  vec_safe_push (ctors, new_elt);

  if (! MACHOPIC_INDIRECT)
    fprintf (asm_out_file, ".reference .constructors_used\n");
}

void
machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
{
  cdtor_record new_elt = {symbol, priority, vec_safe_length (dtors)};

  vec_safe_push (dtors, new_elt);

  if (! MACHOPIC_INDIRECT)
    fprintf (asm_out_file, ".reference .destructors_used\n");
}

static int
sort_cdtor_records (const void * a, const void * b)
{
  const cdtor_record *cda = (const cdtor_record *)a;
  const cdtor_record *cdb = (const cdtor_record *)b;
  if (cda->priority > cdb->priority)
    return 1;
  if (cda->priority < cdb->priority)
    return -1;
  if (cda->position > cdb->position)
    return 1;
  if (cda->position < cdb->position)
    return -1;
  return 0;
}

static void 
finalize_ctors ()
{
  unsigned int i;
  cdtor_record *elt;
 
  if (MACHOPIC_INDIRECT)
    switch_to_section (darwin_sections[mod_init_section]);
  else
    switch_to_section (darwin_sections[constructor_section]);

  if (vec_safe_length (ctors) > 1)
    ctors->qsort (sort_cdtor_records);
  FOR_EACH_VEC_SAFE_ELT (ctors, i, elt)
    {
      assemble_align (POINTER_SIZE);
      assemble_integer (elt->symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
    }
}

static void
finalize_dtors ()
{
  unsigned int i;
  cdtor_record *elt;

  if (MACHOPIC_INDIRECT)
    switch_to_section (darwin_sections[mod_term_section]);
  else
    switch_to_section (darwin_sections[destructor_section]);

  if (vec_safe_length (dtors) > 1)
    dtors->qsort (sort_cdtor_records);
  FOR_EACH_VEC_SAFE_ELT (dtors, i, elt)
    {
      assemble_align (POINTER_SIZE);
      assemble_integer (elt->symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
    }
}

void
darwin_globalize_label (FILE *stream, const char *name)
{
  if (!!strncmp (name, "_OBJC_", 6))
    default_globalize_label (stream, name);
}

/* This routine returns non-zero if 'name' starts with the special objective-c 
   anonymous file-scope static name.  It accommodates c++'s mangling of such 
   symbols (in this case the symbols will have form _ZL{d}*_OBJC_* d=digit).  */
   
int 
darwin_label_is_anonymous_local_objc_name (const char *name)
{
  const unsigned char *p = (const unsigned char *) name;
  if (*p != '_')
    return 0;
  if (p[1] == 'Z' && p[2] == 'L')
  {
    p += 3;
    while (*p >= '0' && *p <= '9')
      p++;
  }
  return (!strncmp ((const char *)p, "_OBJC_", 6));
}

/* LTO support for Mach-O.

   This version uses three mach-o sections to encapsulate the (unlimited
   number of) lto sections.

   __GNU_LTO, __lto_sections  contains the concatented GNU LTO section data.
   __GNU_LTO, __section_names contains the GNU LTO section names.
   __GNU_LTO, __section_index contains an array of values that index these.

   Indexed thus:
     <section offset from the start of __GNU_LTO, __lto_sections>,
     <section length>
     <name offset from the start of __GNU_LTO, __section_names,
     <name length>.

   At present, for both m32 and m64 mach-o files each of these fields is
   represented  by a uint32_t.  This is because, AFAICT, a mach-o object
   cannot exceed 4Gb because the section_64 offset field (see below) is 32bits.

    uint32_t offset;
   "offset  An integer specifying the offset to this section in the file."  */

/* Count lto section numbers.  */
static unsigned int lto_section_num = 0;

/* A vector of information about LTO sections, at present, we only have
   the name.  TODO: see if we can get the data length somehow.  */
typedef struct GTY (()) darwin_lto_section_e {
  const char *sectname;
} darwin_lto_section_e ;

static GTY (()) vec<darwin_lto_section_e, va_gc> *lto_section_names;

/* Segment for LTO data.  */
#define LTO_SEGMENT_NAME "__GNU_LTO"

/* Section wrapper scheme (used here to wrap the unlimited number of LTO
   sections into three Mach-O ones).
   NOTE: These names MUST be kept in sync with those in
	 libiberty/simple-object-mach-o.  */
#define LTO_SECTS_SECTION "__wrapper_sects"
#define LTO_NAMES_SECTION "__wrapper_names"
#define LTO_INDEX_SECTION "__wrapper_index"

/* File to temporarily store LTO data.  This is appended to asm_out_file
   in darwin_end_file.  */
static FILE *lto_asm_out_file, *saved_asm_out_file;
static char *lto_asm_out_name;

/* Prepare asm_out_file for LTO output.  For darwin, this means hiding
   asm_out_file and switching to an alternative output file.  */
void
darwin_asm_lto_start (void)
{
  gcc_assert (! saved_asm_out_file);
  saved_asm_out_file = asm_out_file;
  if (! lto_asm_out_name)
    lto_asm_out_name = make_temp_file (".lto.s");
  lto_asm_out_file = fopen (lto_asm_out_name, "a");
  if (lto_asm_out_file == NULL)
    fatal_error ("failed to open temporary file %s for LTO output",
		 lto_asm_out_name);
  asm_out_file = lto_asm_out_file;
}

/* Restore asm_out_file.  */
void
darwin_asm_lto_end (void)
{
  gcc_assert (saved_asm_out_file);
  fclose (lto_asm_out_file);
  asm_out_file = saved_asm_out_file;
  saved_asm_out_file = NULL;
}

static void
darwin_asm_dwarf_section (const char *name, unsigned int flags, tree decl);

/*  Called for the TARGET_ASM_NAMED_SECTION hook.  */

void
darwin_asm_named_section (const char *name,
			  unsigned int flags,
			  tree decl ATTRIBUTE_UNUSED)
{
  /* LTO sections go in a special section that encapsulates the (unlimited)
     number of GNU LTO sections within a single mach-o one.  */
  if (strncmp (name, LTO_SECTION_NAME_PREFIX,
	       strlen (LTO_SECTION_NAME_PREFIX)) == 0)
    {
      darwin_lto_section_e e;
      /* We expect certain flags to be set...  */
      gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
		  == (SECTION_DEBUG | SECTION_NAMED));

      /* Switch to our combined section.  */
      fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
	       LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
      /* Output a label for the start of this sub-section.  */
      fprintf (asm_out_file, "L_GNU_LTO%d:\t;# %s\n",
	       lto_section_num, name);
      /* We have to jump through hoops to get the values of the intra-section
         offsets... */
      fprintf (asm_out_file, "\t.set L$gnu$lto$offs%d,L_GNU_LTO%d-L_GNU_LTO0\n",
	       lto_section_num, lto_section_num);
      fprintf (asm_out_file,
	       "\t.set L$gnu$lto$size%d,L_GNU_LTO%d-L_GNU_LTO%d\n",
	       lto_section_num, lto_section_num+1, lto_section_num);
      lto_section_num++;
      e.sectname = xstrdup (name);
      /* Keep the names, we'll need to make a table later.
         TODO: check that we do not revisit sections, that would break
         the assumption of how this is done.  */
      if (lto_section_names == NULL)
        vec_alloc (lto_section_names, 16);
      vec_safe_push (lto_section_names, e);
   }
  else if (strncmp (name, "__DWARF,", 8) == 0)
    darwin_asm_dwarf_section (name, flags, decl);
  else
    fprintf (asm_out_file, "\t.section %s\n", name);
}

void
darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
{
  /* Darwin does not use unique sections.  */
}

/* Handle __attribute__ ((apple_kext_compatibility)).
   This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
   vtable for classes with this attribute (and their descendants) by not
   outputting the new 3.0 nondeleting destructor.  This means that such
   objects CANNOT be allocated on the stack or as globals UNLESS they have
   a completely empty `operator delete'.
   Luckily, this fits in with the Darwin kext model.

   This attribute also disables gcc3's potential overlaying of derived
   class data members on the padding at the end of the base class.  */

tree
darwin_handle_kext_attribute (tree *node, tree name,
			      tree args ATTRIBUTE_UNUSED,
			      int flags ATTRIBUTE_UNUSED,
			      bool *no_add_attrs)
{
  /* APPLE KEXT stuff -- only applies with pure static C++ code.  */
  if (! TARGET_KEXTABI)
    {
      warning (0, "%qE 2.95 vtable-compatibility attribute applies "
	       "only when compiling a kext", name);

      *no_add_attrs = true;
    }
  else if (TREE_CODE (*node) != RECORD_TYPE)
    {
      warning (0, "%qE 2.95 vtable-compatibility attribute applies "
	       "only to C++ classes", name);

      *no_add_attrs = true;
    }

  return NULL_TREE;
}

/* Handle a "weak_import" attribute; arguments as in
   struct attribute_spec.handler.  */

tree
darwin_handle_weak_import_attribute (tree *node, tree name,
				     tree ARG_UNUSED (args),
				     int ARG_UNUSED (flags),
				     bool * no_add_attrs)
{
  if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
    {
      warning (OPT_Wattributes, "%qE attribute ignored",
	       name);
      *no_add_attrs = true;
    }
  else
    declare_weak (*node);

  return NULL_TREE;
}

/* Emit a label for an FDE, making it global and/or weak if appropriate.
   The third parameter is nonzero if this is for exception handling.
   The fourth parameter is nonzero if this is just a placeholder for an
   FDE that we are omitting. */

void
darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
{
  char *lab ;
  char buf[32];
  static int invok_count = 0;
  static tree last_fun_decl = NULL_TREE;
  
  /* We use the linker to emit the .eh labels for Darwin 9 and above.  */
  if (! for_eh || generating_for_darwin_version >= 9)
    return;

  /* FIXME: This only works when the eh for all sections of a function is 
     emitted at the same time.  If that changes, we would need to use a lookup
     table of some form to determine what to do.  Also, we should emit the
     unadorned label for the partition containing the public label for a
     function.  This is of limited use, probably, since we do not currently
     enable partitioning.  */
  strcpy (buf, ".eh");
  if (decl && TREE_CODE (decl) == FUNCTION_DECL) 
    {
      if (decl == last_fun_decl)
        {
	  invok_count++;
	  snprintf (buf, 31, "$$part$$%d.eh", invok_count);
	}
      else
	{
	  last_fun_decl = decl;
	  invok_count = 0;
	}
    }

  lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), buf, NULL);

  if (TREE_PUBLIC (decl))
    {
      targetm.asm_out.globalize_label (file, lab);
      if (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN)
	{
	  fputs ("\t.private_extern ", file);
	  assemble_name (file, lab);
	  fputc ('\n', file);
	}
    }

  if (DECL_WEAK (decl))
    {
      fputs ("\t.weak_definition ", file);
      assemble_name (file, lab);
      fputc ('\n', file);
    }

  assemble_name (file, lab);
  if (empty)
    {
      fputs (" = 0\n", file);

      /* Mark the absolute .eh and .eh1 style labels as needed to
	 ensure that we don't dead code strip them and keep such
	 labels from another instantiation point until we can fix this
	 properly with group comdat support.  */
      darwin_mark_decl_preserved (lab);
    }
  else
    fputs (":\n", file);

  free (lab);
}

static GTY(()) unsigned long except_table_label_num;

void
darwin_emit_except_table_label (FILE *file)
{
  char section_start_label[30];

  ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
			       except_table_label_num++);
  ASM_OUTPUT_LABEL (file, section_start_label);
}
/* Generate a PC-relative reference to a Mach-O non-lazy-symbol.  */

void
darwin_non_lazy_pcrel (FILE *file, rtx addr)
{
  const char *nlp_name;

  gcc_assert (GET_CODE (addr) == SYMBOL_REF);

  nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
  fputs ("\t.long\t", file);
  ASM_OUTPUT_LABELREF (file, nlp_name);
  fputs ("-.", file);
}

/* If this is uncommented, details of each allocation will be printed
   in the asm right before the actual code.  WARNING - this will cause some
   test-suite fails (since the printout will contain items that some tests
   are not expecting) -- so don't leave it on by default (it bloats the
   asm too).  */
/*#define DEBUG_DARWIN_MEM_ALLOCATORS*/

/* The first two of these routines are ostensibly just intended to put
   names into the asm.  However, they are both hijacked in order to ensure
   that zero-sized items do not make their way into the output.  Consequently,
   we also need to make these participate in provisions for dealing with
   such items in section anchors.  */

/* The implementation of ASM_DECLARE_OBJECT_NAME.  */
/* The RTTI data (e.g., __ti4name) is common and public (and static),
   but it does need to be referenced via indirect PIC data pointers.
   The machopic_define_symbol calls are telling the machopic subsystem
   that the name *is* defined in this module, so it doesn't need to
   make them indirect.  */
void 
darwin_asm_declare_object_name (FILE *file, 
				const char *nam, tree decl)
{
  const char *xname = nam;
  unsigned HOST_WIDE_INT size;
  bool local_def, weak;

  weak = (DECL_P (decl)
	  && DECL_WEAK (decl)
	  && !lookup_attribute ("weak_import", 
				 DECL_ATTRIBUTES (decl)));

  local_def = DECL_INITIAL (decl) || (TREE_STATIC (decl) 
				      && (!DECL_COMMON (decl) 
					  || !TREE_PUBLIC (decl)));

  if (GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
    xname = IDENTIFIER_POINTER (DECL_NAME (decl));

  if (local_def)
    {
      (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
      if (!weak)
	machopic_define_symbol (DECL_RTL (decl));
    }

  size = tree_to_uhwi (DECL_SIZE_UNIT (decl));

#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
fprintf (file, "# dadon: %s %s (%llu, %u) local %d weak %d"
	       " stat %d com %d pub %d t-const %d t-ro %d init %lx\n",
	xname, (TREE_CODE (decl) == VAR_DECL?"var":"const"), 
	(unsigned long long)size, DECL_ALIGN (decl), local_def, 
	DECL_WEAK (decl), TREE_STATIC (decl), DECL_COMMON (decl),
	TREE_PUBLIC (decl), TREE_CONSTANT (decl), TREE_READONLY (decl),
	(unsigned long)DECL_INITIAL (decl)); 
#endif

  /* Darwin needs help to support local zero-sized objects. 
     They must be made at least one byte, and the section containing must be
     marked as unsuitable for section-anchors (see storage allocators below).
     
     For non-zero objects this output is handled by varasm.c.
  */
  if (!size)
    {
      unsigned int l2align = 0;

      /* The align must be honored, even for zero-sized.  */
      if (DECL_ALIGN (decl))
	{
	  l2align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
	  fprintf (file, "\t.align\t%u\n", l2align);
	}

      ASM_OUTPUT_LABEL (file, xname);
      size = 1;
      fprintf (file, "\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);

      /* Check that we've correctly picked up the zero-sized item and placed it
         properly.  */
      gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
		  || (in_section 
		      && (in_section->common.flags & SECTION_NO_ANCHOR)));
    }
  else
    ASM_OUTPUT_LABEL (file, xname);
}

/* The implementation of ASM_DECLARE_CONSTANT_NAME.  */
void
darwin_asm_declare_constant_name (FILE *file, const char *name,
				  const_tree exp ATTRIBUTE_UNUSED,
				  HOST_WIDE_INT size)
{
  assemble_label (file, name);
  /* As for other items, we need at least one byte.  */
  if (!size)
    {
      fputs ("\t.space\t1\n", file);
      /* Check that we've correctly picked up the zero-sized item and placed it
         properly.  */
      gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
		  || (in_section 
		      && (in_section->common.flags & SECTION_NO_ANCHOR)));
    }
}

/* Darwin storage allocators.

   Zerofill sections are desirable for large blank data since, otherwise, these
   data bloat objects (PR33210).

   However, section anchors don't work in .zerofill sections (one cannot switch
   to a zerofill section).  Ergo, for Darwin targets using section anchors we need
   to put (at least some) data into 'normal' switchable sections.

   Here we set a relatively arbitrary value for the size of an object to trigger
   zerofill when section anchors are enabled (anything bigger than a page for
   current Darwin implementations).  FIXME: there ought to be some objective way
   to make this choice.

   When section anchor are off this is ignored anyway.  */

#define BYTES_ZFILL 4096

/* Emit a chunk of data for items coalesced by the linker.  */
static void
darwin_emit_weak_or_comdat (FILE *fp, tree decl, const char *name,
				  unsigned HOST_WIDE_INT size, 
				  unsigned int align)
{
  /* Since the sections used here are coalesed, they will not be eligible
     for section anchors, and therefore we don't need to break that out.  */
 if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
    switch_to_section (darwin_sections[const_data_coal_section]);
  else
    switch_to_section (darwin_sections[data_coal_section]);

  /* To be consistent, we'll allow darwin_asm_declare_object_name to assemble
     the align info for zero-sized items... but do it here otherwise.  */
  if (size && align)
    fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));

  if (TREE_PUBLIC (decl))
    darwin_globalize_label (fp, name);

  /* ... and we let it deal with outputting one byte of zero for them too.  */ 
  darwin_asm_declare_object_name (fp, name, decl);
  if (size)
    assemble_zeros (size);
}

/* Emit a chunk of data for ObjC meta-data that got placed in BSS erroneously.  */
static void
darwin_emit_objc_zeroed (FILE *fp, tree decl, const char *name,
				  unsigned HOST_WIDE_INT size, 
				  unsigned int align, tree meta)
{
  section *ocs = data_section;

  if (TREE_PURPOSE (meta) == get_identifier("OBJC2META"))
    ocs = darwin_objc2_section (decl, meta, ocs);
  else
    ocs = darwin_objc1_section (decl, meta, ocs);

  switch_to_section (ocs);

  /* We shall declare that zero-sized meta-data are not valid (yet).  */
  gcc_assert (size);
  fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));

  /* ... and we let it deal with outputting one byte of zero for them too.  */ 
  darwin_asm_declare_object_name (fp, name, decl);
  assemble_zeros (size);
}

/* This routine emits 'local' storage:

   When Section Anchors are off this routine emits .zerofill commands in 
   sections named for their alignment.

   When Section Anchors are on, smaller (non-zero-sized) items are placed in
   the .static_data section so that the section anchoring system can see them.
   Larger items are still placed in .zerofill sections, addressing PR33210.
   The routine has no checking - it is all assumed to be done by the caller.
*/
static void
darwin_emit_local_bss (FILE *fp, tree decl, const char *name, 
			unsigned HOST_WIDE_INT size, 
			unsigned int l2align)
{
   /* FIXME: We have a fudge to make this work with Java even when the target does
   not use sections anchors -- Java seems to need at least one small item in a
   non-zerofill segment.   */
   if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
       || (size && size <= 2))
    {
      /* Put smaller objects in _static_data, where the section anchors system
	 can get them.
	 However, if they are zero-sized punt them to yet a different section
	 (that is not allowed to participate in anchoring).  */
      if (!size)
	{
	  fputs ("\t.section\t__DATA,__zobj_bss\n", fp);
	  in_section = darwin_sections[zobj_bss_section];
	  size = 1;
	}
      else
	{
	  fputs ("\t.static_data\n", fp);
	  in_section = darwin_sections[static_data_section];
	}

      if (l2align)
	fprintf (fp, "\t.align\t%u\n", l2align);

      assemble_name (fp, name);        
      fprintf (fp, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
    }
  else 
    {
      /* When we are on a non-section anchor target, we can get zero-sized
	 items here.  However, all we need to do is to bump them to one byte
	 and the section alignment will take care of the rest.  */
      char secnam[64];
      unsigned int flags ;
      snprintf (secnam, 64, "__DATA,__%sbss%u", ((size)?"":"zo_"), 
						(unsigned) l2align);
      /* We can't anchor (yet, if ever) in zerofill sections, because we can't
	 switch to them and emit a label.  */
      flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
      in_section = get_section (secnam, flags, NULL);
      fprintf (fp, "\t.zerofill %s,", secnam);
      assemble_name (fp, name);
      if (!size)
	size = 1;

      if (l2align)
	fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",
		 size, (unsigned) l2align);
      else
	fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
    }

  (*targetm.encode_section_info) (decl, DECL_RTL (decl), false);
  /* This is defined as a file-scope var, so we know to notify machopic.  */
  machopic_define_symbol (DECL_RTL (decl));
}

/* Emit a chunk of common.  */
static void
darwin_emit_common (FILE *fp, const char *name,
		    unsigned HOST_WIDE_INT size, unsigned int align) 
{
  unsigned HOST_WIDE_INT rounded;
  unsigned int l2align;

  /* Earlier systems complain if the alignment exceeds the page size. 
     The magic number is 4096 * 8 - hard-coded for legacy systems.  */
  if (!emit_aligned_common && (align > 32768UL))
    align = 4096UL; /* In units.  */
  else
    align /= BITS_PER_UNIT;

  /* Make sure we have a meaningful align.  */
  if (!align)
    align = 1;

  /* For earlier toolchains, we need to emit the var as a rounded size to 
     tell ld the alignment.  */
  if (size < align) 
    rounded = align;
  else
    rounded = (size + (align-1)) & ~(align-1);

  l2align = floor_log2 (align);
  gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);

  in_section = comm_section;
  /* We mustn't allow multiple public symbols to share an address when using
     the normal OSX toolchain.  */
  if (!size)
    {
      /* Put at least one byte.  */
      size = 1;
      /* This section can no longer participate in section anchoring.  */
      comm_section->common.flags |= SECTION_NO_ANCHOR;
    }

  fputs ("\t.comm\t", fp);
  assemble_name (fp, name);
  fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED, 
	   emit_aligned_common?size:rounded);
  if (l2align && emit_aligned_common)
    fprintf (fp, ",%u", l2align);
  fputs ("\n", fp);
}

/* Output a var which is all zero - into aligned BSS sections, common, lcomm
   or coalescable data sections (for weak or comdat) as appropriate.  */

void
darwin_output_aligned_bss (FILE *fp, tree decl, const char *name,
			  unsigned HOST_WIDE_INT size, unsigned int align)
{
  unsigned int l2align;
  bool one, pub, weak;
  tree meta;

  pub = TREE_PUBLIC (decl);
  one = DECL_ONE_ONLY (decl);
  weak = (DECL_P (decl)
	  && DECL_WEAK (decl)
	  && !lookup_attribute ("weak_import", 
				 DECL_ATTRIBUTES (decl)));

#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
fprintf (fp, "# albss: %s (%lld,%d) ro %d cst %d stat %d com %d"
	     " pub %d weak %d one %d init %lx\n",
	name, (long long)size, (int)align, TREE_READONLY (decl), 
	TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
	pub, weak, one, (unsigned long)DECL_INITIAL (decl)); 
#endif

  /* ObjC metadata can get put in BSS because varasm.c decides it's BSS 
     before the target has a chance to comment.  */
  if ((meta = is_objc_metadata (decl)))
    {
      darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
      return;
    }

  /* Check that any initializer is valid.  */
  gcc_assert ((DECL_INITIAL (decl) == NULL) 
	       || (DECL_INITIAL (decl) == error_mark_node) 
	       || initializer_zerop (DECL_INITIAL (decl)));

  gcc_assert (DECL_SECTION_NAME (decl) == NULL);
  gcc_assert (!DECL_COMMON (decl));

  /*  Pick up the correct alignment.  */
  if (!size || !align)
    align = DECL_ALIGN (decl);

  l2align = floor_log2 (align / BITS_PER_UNIT);
  gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
  
  last_assemble_variable_decl = decl;

  /* We would rather not have to check this here - but it seems that we might
     be passed a decl that should be in coalesced space.  */
  if (one || weak)
    {
      /* Weak or COMDAT objects are put in mergeable sections.  */
      darwin_emit_weak_or_comdat (fp, decl, name, size, 
					DECL_ALIGN (decl));
      return;
    } 

  /* If this is not public, then emit according to local rules.  */
  if (!pub)
    {
      darwin_emit_local_bss (fp, decl, name, size, l2align);	
      return;
    }

  /* So we have a public symbol (small item fudge for Java, see above).  */
  if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL) 
       || (size && size <= 2))
    {
      /* Put smaller objects in data, where the section anchors system can get
	 them.  However, if they are zero-sized punt them to yet a different 
	 section (that is not allowed to participate in anchoring).  */
      if (!size)
	{
	  fputs ("\t.section\t__DATA,__zobj_data\n", fp);
	  in_section = darwin_sections[zobj_data_section];
	  size = 1;
	}
      else
	{
	  fputs ("\t.data\n", fp);
	  in_section = data_section;
	}

      if (l2align)
	fprintf (fp, "\t.align\t%u\n", l2align);

      assemble_name (fp, name);
      fprintf (fp, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
    }
  else 
    {
      char secnam[64];
      unsigned int flags ;
      /* When we are on a non-section anchor target, we can get zero-sized
	 items here.  However, all we need to do is to bump them to one byte
	 and the section alignment will take care of the rest.  */
      snprintf (secnam, 64, "__DATA,__%spu_bss%u", ((size)?"":"zo_"), l2align);

      /* We can't anchor in zerofill sections, because we can't switch
	 to them and emit a label.  */
      flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
      in_section = get_section (secnam, flags, NULL);
      fprintf (fp, "\t.zerofill %s,", secnam);
      assemble_name (fp, name);
      if (!size)
	size = 1;

      if (l2align)
	fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", size, l2align);
      else
	fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
    }
  (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
}

/* Output a chunk of common, with alignment specified (where the target
   supports this).  */
void
darwin_asm_output_aligned_decl_common (FILE *fp, tree decl, const char *name,
				       unsigned HOST_WIDE_INT size, 
				       unsigned int align)
{
  unsigned int l2align;
  bool one, weak;
  tree meta;

  /* No corresponding var.  */
  if (decl==NULL)
    {
#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
fprintf (fp, "# adcom: %s (%d,%d) decl=0x0\n", name, (int)size, (int)align); 
#endif
      darwin_emit_common (fp, name, size, align);
      return;
    }

  one = DECL_ONE_ONLY (decl);
  weak = (DECL_P (decl)
	  && DECL_WEAK (decl)
	  && !lookup_attribute ("weak_import", 
				 DECL_ATTRIBUTES (decl)));

#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
fprintf (fp, "# adcom: %s (%lld,%d) ro %d cst %d stat %d com %d pub %d"
	     " weak %d one %d init %lx\n",
	name,  (long long)size, (int)align, TREE_READONLY (decl), 
	TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
	TREE_PUBLIC (decl), weak, one, (unsigned long)DECL_INITIAL (decl)); 
#endif

  /* ObjC metadata can get put in BSS because varasm.c decides it's BSS 
     before the target has a chance to comment.  */
  if ((meta = is_objc_metadata (decl)))
    {
      darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
      return;
    }

  /* We shouldn't be messing with this if the decl has a section name.  */
  gcc_assert (DECL_SECTION_NAME (decl) == NULL);

  /* We would rather not have to check this here - but it seems that we might
     be passed a decl that should be in coalesced space.  */
  if (one || weak)
    {
      /* Weak or COMDAT objects are put in mergable sections.  */
      darwin_emit_weak_or_comdat (fp, decl, name, size, 
					DECL_ALIGN (decl));
      return;
    } 

  /* We should only get here for DECL_COMMON, with a zero init (and, in 
     principle, only for public symbols too - although we deal with local
     ones below).  */

  /* Check the initializer is OK.  */
  gcc_assert (DECL_COMMON (decl) 
	      && ((DECL_INITIAL (decl) == NULL) 
	       || (DECL_INITIAL (decl) == error_mark_node) 
	       || initializer_zerop (DECL_INITIAL (decl))));

  last_assemble_variable_decl = decl;

  if (!size || !align) 
    align = DECL_ALIGN (decl);

  l2align = floor_log2 (align / BITS_PER_UNIT);
  /* Check we aren't asking for more aligment than the platform allows.  */
  gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);

  if (TREE_PUBLIC (decl) != 0)
    darwin_emit_common (fp, name, size, align);
  else
    darwin_emit_local_bss (fp, decl, name, size, l2align);	
}

/* Output a chunk of BSS with alignment specfied.  */
void
darwin_asm_output_aligned_decl_local (FILE *fp, tree decl, const char *name, 
				      unsigned HOST_WIDE_INT size, 
				      unsigned int align)
{
  unsigned long l2align;
  bool one, weak;
  tree meta;

  one = DECL_ONE_ONLY (decl);
  weak = (DECL_P (decl)
	  && DECL_WEAK (decl)
	  && !lookup_attribute ("weak_import", 
				 DECL_ATTRIBUTES (decl)));

#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
fprintf (fp, "# adloc: %s (%lld,%d) ro %d cst %d stat %d one %d pub %d"
	     " weak %d init %lx\n",
	name, (long long)size, (int)align, TREE_READONLY (decl), 
	TREE_CONSTANT (decl), TREE_STATIC (decl), one, TREE_PUBLIC (decl),
	weak , (unsigned long)DECL_INITIAL (decl)); 
#endif

  /* ObjC metadata can get put in BSS because varasm.c decides it's BSS 
     before the target has a chance to comment.  */
  if ((meta = is_objc_metadata (decl)))
    {
      darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
      return;
    }

  /* We shouldn't be messing with this if the decl has a section name.  */
  gcc_assert (DECL_SECTION_NAME (decl) == NULL);

  /* We would rather not have to check this here - but it seems that we might
     be passed a decl that should be in coalesced space.  */
  if (one || weak)
    {
      /* Weak or COMDAT objects are put in mergable sections.  */
      darwin_emit_weak_or_comdat (fp, decl, name, size, 
					DECL_ALIGN (decl));
      return;
    } 

  /* .. and it should be suitable for placement in local mem.  */
  gcc_assert(!TREE_PUBLIC (decl) && !DECL_COMMON (decl));
  /* .. and any initializer must be all-zero.  */
  gcc_assert ((DECL_INITIAL (decl) == NULL) 
	       || (DECL_INITIAL (decl) == error_mark_node) 
	       || initializer_zerop (DECL_INITIAL (decl)));

  last_assemble_variable_decl = decl;

  if (!size || !align)
    align = DECL_ALIGN (decl);

  l2align = floor_log2 (align / BITS_PER_UNIT);
  gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);

  darwin_emit_local_bss (fp, decl, name, size, l2align);
}

/* Emit an assembler directive to set visibility for a symbol.  The
   only supported visibilities are VISIBILITY_DEFAULT and
   VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
   extern".  There is no MACH-O equivalent of ELF's
   VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */

void
darwin_assemble_visibility (tree decl, int vis)
{
  if (vis == VISIBILITY_DEFAULT)
    ;
  else if (vis == VISIBILITY_HIDDEN || vis == VISIBILITY_INTERNAL)
    {
      fputs ("\t.private_extern ", asm_out_file);
      assemble_name (asm_out_file,
		     (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
      fputs ("\n", asm_out_file);
    }
  else
    warning (OPT_Wattributes, "protected visibility attribute "
	     "not supported in this configuration; ignored");
}

/* vec used by darwin_asm_dwarf_section.
   Maybe a hash tab would be better here - but the intention is that this is
   a very short list (fewer than 16 items) and each entry should (ideally, 
   eventually) only be presented once.

   A structure to hold a dwarf debug section used entry.  */

typedef struct GTY(()) dwarf_sect_used_entry {
  const char *name;
  unsigned count;
}
dwarf_sect_used_entry;


/* A list of used __DWARF sections.  */
static GTY (()) vec<dwarf_sect_used_entry, va_gc> *dwarf_sect_names_table;

/* This is called when we are asked to assemble a named section and the 
   name begins with __DWARF,.  We keep a list of the section names (without
   the __DWARF, prefix) and use this to emit our required start label on the
   first switch to each section.  */

static void
darwin_asm_dwarf_section (const char *name, unsigned int flags,
			  tree ARG_UNUSED (decl))
{
  unsigned i;
  int namelen;
  const char * sname;
  dwarf_sect_used_entry *ref;
  bool found = false;
  gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
		    == (SECTION_DEBUG | SECTION_NAMED));
  /* We know that the name starts with __DWARF,  */
  sname = name + 8;
  namelen = strchr (sname, ',') - sname;
  gcc_assert (namelen);
  if (dwarf_sect_names_table == NULL)
    vec_alloc (dwarf_sect_names_table, 16);
  else
    for (i = 0; 
	 dwarf_sect_names_table->iterate (i, &ref);
	 i++)
      {
	if (!ref)
	  break;
	if (!strcmp (ref->name, sname))
	  {
	    found = true;
	    ref->count++;
	    break;
	  }
      }

  fprintf (asm_out_file, "\t.section %s\n", name);
  if (!found)
    {
      dwarf_sect_used_entry e;
      fprintf (asm_out_file, "Lsection%.*s:\n", namelen, sname);
      e.count = 1;
      e.name = xstrdup (sname);
      vec_safe_push (dwarf_sect_names_table, e);
    }
}

/* Output a difference of two labels that will be an assembly time
   constant if the two labels are local.  (.long lab1-lab2 will be
   very different if lab1 is at the boundary between two sections; it
   will be relocated according to the second section, not the first,
   so one ends up with a difference between labels in different
   sections, which is bad in the dwarf2 eh context for instance.)  */

static int darwin_dwarf_label_counter;

void
darwin_asm_output_dwarf_delta (FILE *file, int size,
			       const char *lab1, const char *lab2)
{
  int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
		     && lab2[0] == '*' && lab2[1] == 'L');
  const char *directive = (size == 8 ? ".quad" : ".long");

  if (islocaldiff)
    fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
  else
    fprintf (file, "\t%s\t", directive);

  assemble_name_raw (file, lab1);
  fprintf (file, "-");
  assemble_name_raw (file, lab2);
  if (islocaldiff)
    fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
}

/* Output an offset in a DWARF section on Darwin.  On Darwin, DWARF section
   offsets are not represented using relocs in .o files; either the
   section never leaves the .o file, or the linker or other tool is
   responsible for parsing the DWARF and updating the offsets.  */

void
darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
				section *base)
{
  char sname[64];
  int namelen;

  gcc_assert (base->common.flags & SECTION_NAMED);
  gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
  gcc_assert (strchr (base->named.name + 8, ','));

  namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
  sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
  darwin_asm_output_dwarf_delta (file, size, lab, sname);
}

/* Called from the within the TARGET_ASM_FILE_START for each target.  */

void
darwin_file_start (void)
{
  /* Nothing to do.  */
}

/* Called for the TARGET_ASM_FILE_END hook.
   Emit the mach-o pic indirection data, the lto data and, finally a flag
   to tell the linker that it can break the file object into sections and
   move those around for efficiency.  */

void
darwin_file_end (void)
{
  if (!vec_safe_is_empty (ctors))
    finalize_ctors ();
  if (!vec_safe_is_empty (dtors))
    finalize_dtors ();

  /* If we are expecting to output NeXT ObjC meta-data, (and we actually see
     some) then we output the fix-and-continue marker (Image Info).
     This applies to Objective C, Objective C++ and LTO with either language
     as part of the input.  */
  if (flag_next_runtime && objc_metadata_seen)
    {
      unsigned int flags = 0;
      if (flag_objc_abi >= 2)
	{
	  flags = 16;
	  output_section_asm_op
	    (darwin_sections[objc2_image_info_section]->unnamed.data);
	}
      else
	output_section_asm_op
	  (darwin_sections[objc_image_info_section]->unnamed.data);

      ASM_OUTPUT_ALIGN (asm_out_file, 2);
      fputs ("L_OBJC_ImageInfo:\n", asm_out_file);

      flags |= (flag_replace_objc_classes && classes_seen) ? 1 : 0;
      flags |= flag_objc_gc ? 2 : 0;

      fprintf (asm_out_file, "\t.long\t0\n\t.long\t%u\n", flags);
     }

  machopic_finish (asm_out_file);
  if (strcmp (lang_hooks.name, "GNU C++") == 0)
    {
      switch_to_section (darwin_sections[constructor_section]);
      switch_to_section (darwin_sections[destructor_section]);
      ASM_OUTPUT_ALIGN (asm_out_file, 1);
    }

  /* If there was LTO assembler output, append it to asm_out_file.  */
  if (lto_asm_out_name)
    {
      int n;
      char *buf, *lto_asm_txt;

      /* Shouldn't be here if we failed to switch back.  */
      gcc_assert (! saved_asm_out_file);

      lto_asm_out_file = fopen (lto_asm_out_name, "r");
      if (lto_asm_out_file == NULL)
	fatal_error ("failed to open temporary file %s with LTO output",
		     lto_asm_out_name);
      fseek (lto_asm_out_file, 0, SEEK_END);
      n = ftell (lto_asm_out_file);
      if (n > 0)
        {
	  fseek (lto_asm_out_file, 0, SEEK_SET);
	  lto_asm_txt = buf = (char *) xmalloc (n + 1);
	  while (fgets (lto_asm_txt, n, lto_asm_out_file))
	    fputs (lto_asm_txt, asm_out_file);
	  /* Put a termination label.  */
	  fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
		   LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
	  fprintf (asm_out_file, "L_GNU_LTO%d:\t;# end of lto\n",
		   lto_section_num);
	  /* Make sure our termination label stays in this section.  */
	  fputs ("\t.space\t1\n", asm_out_file);
	}

      /* Remove the temporary file.  */
      fclose (lto_asm_out_file);
      unlink_if_ordinary (lto_asm_out_name);
      free (lto_asm_out_name);
    }

  /* Output the names and indices.  */
  if (lto_section_names && lto_section_names->length ())
    {
      int count;
      darwin_lto_section_e *ref;
      /* For now, we'll make the offsets 4 bytes and unaligned - we'll fix
         the latter up ourselves.  */
      const char *op = integer_asm_op (4,0);

      /* Emit the names.  */
      fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
	       LTO_SEGMENT_NAME, LTO_NAMES_SECTION);
      FOR_EACH_VEC_ELT (*lto_section_names, count, ref)
	{
	  fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\n", count);
         /* We have to jump through hoops to get the values of the intra-section
            offsets... */
	  fprintf (asm_out_file,
		   "\t.set L$gnu$lto$noff%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME0\n",
		   count, count);
	  fprintf (asm_out_file,
		   "\t.set L$gnu$lto$nsiz%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME%d\n",
		   count, count+1, count);
	  fprintf (asm_out_file, "\t.asciz\t\"%s\"\n", ref->sectname);
	}
      fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\t;# end\n", lto_section_num);
      /* make sure our termination label stays in this section.  */
      fputs ("\t.space\t1\n", asm_out_file);

      /* Emit the Index.  */
      fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
	       LTO_SEGMENT_NAME, LTO_INDEX_SECTION);
      fputs ("\t.align\t2\n", asm_out_file);
      fputs ("# Section offset, Section length, Name offset, Name length\n",
	     asm_out_file);
      FOR_EACH_VEC_ELT (*lto_section_names, count, ref)
	{
	  fprintf (asm_out_file, "%s L$gnu$lto$offs%d\t;# %s\n",
		   op, count, ref->sectname);
	  fprintf (asm_out_file, "%s L$gnu$lto$size%d\n", op, count);
	  fprintf (asm_out_file, "%s L$gnu$lto$noff%d\n", op, count);
	  fprintf (asm_out_file, "%s L$gnu$lto$nsiz%d\n", op, count);
	}
    }

  /* If we have section anchors, then we must prevent the linker from
     re-arranging data.  */
  if (!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
    fprintf (asm_out_file, "\t.subsections_via_symbols\n");
}

/* TODO: Add a language hook for identifying if a decl is a vtable.  */
#define DARWIN_VTABLE_P(DECL) 0

/* Cross-module name binding.  Darwin does not support overriding
   functions at dynamic-link time, except for vtables in kexts.  */

bool
darwin_binds_local_p (const_tree decl)
{
  return default_binds_local_p_1 (decl,
				  TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
}

/* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR.  Define the
   anchor relative to ".", the current section position.  We cannot use
   the default one because ASM_OUTPUT_DEF is wrong for Darwin.  */
void
darwin_asm_output_anchor (rtx symbol)
{
  fprintf (asm_out_file, "\t.set\t");
  assemble_name (asm_out_file, XSTR (symbol, 0));
  fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
	   SYMBOL_REF_BLOCK_OFFSET (symbol));
}

/* Disable section anchoring on any section containing a zero-sized 
   object.  */
bool
darwin_use_anchors_for_symbol_p (const_rtx symbol)
{
  if (DARWIN_SECTION_ANCHORS && flag_section_anchors) 
    {
      section *sect;
      /* If the section contains a zero-sized object it's ineligible.  */
      sect = SYMBOL_REF_BLOCK (symbol)->sect;
      /* This should have the effect of disabling anchors for vars that follow
         any zero-sized one, in a given section.  */     
      if (sect->common.flags & SECTION_NO_ANCHOR)
	return false;

        /* Also check the normal reasons for suppressing.  */
        return default_use_anchors_for_symbol_p (symbol);
    }
  else
    return false;
}

/* Set the darwin specific attributes on TYPE.  */
void
darwin_set_default_type_attributes (tree type)
{
  if (darwin_ms_struct
      && TREE_CODE (type) == RECORD_TYPE)
    TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
                                        NULL_TREE,
                                        TYPE_ATTRIBUTES (type));
}

/* True, iff we're generating code for loadable kernel extensions.  */

bool
darwin_kextabi_p (void) {
  return flag_apple_kext;
}

void
darwin_override_options (void)
{
  /* Keep track of which (major) version we're generating code for.  */
  if (darwin_macosx_version_min)
    {
      if (strverscmp (darwin_macosx_version_min, "10.6") >= 0)
	generating_for_darwin_version = 10;
      else if (strverscmp (darwin_macosx_version_min, "10.5") >= 0)
	generating_for_darwin_version = 9;

      /* Earlier versions are not specifically accounted, until required.  */
    }

  /* In principle, this should be c-family only.  However, we really need to
     set sensible defaults for LTO as well, since the section selection stuff
     should check for correctness re. the ABI.  TODO: check and provide the
     flags (runtime & ABI) from the lto wrapper).  */

  /* Unless set, force ABI=2 for NeXT and m64, 0 otherwise.  */
  if (!global_options_set.x_flag_objc_abi)
    global_options.x_flag_objc_abi
	= (!flag_next_runtime)
		? 0
		: (TARGET_64BIT ? 2
				: (generating_for_darwin_version >= 9) ? 1
								       : 0);

  /* Objective-C family ABI 2 is only valid for next/m64 at present.  */
  if (global_options_set.x_flag_objc_abi && flag_next_runtime)
    {
      if (TARGET_64BIT && global_options.x_flag_objc_abi < 2)
	error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 must be"
				    " used for %<-m64%> targets with"
				    " %<-fnext-runtime%>");
      if (!TARGET_64BIT && global_options.x_flag_objc_abi >= 2)
	error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 is not"
				    " supported on %<-m32%> targets with"
				    " %<-fnext-runtime%>");
    }

  /* Don't emit DWARF3/4 unless specifically selected.  This is a 
     workaround for tool bugs.  */
  if (!global_options_set.x_dwarf_strict) 
    dwarf_strict = 1;
  if (!global_options_set.x_dwarf_version)
    dwarf_version = 2;

  /* Do not allow unwind tables to be generated by default for m32.  
     fnon-call-exceptions will override this, regardless of what we do.  */
  if (generating_for_darwin_version < 10
      && !global_options_set.x_flag_asynchronous_unwind_tables
      && !TARGET_64BIT)
    global_options.x_flag_asynchronous_unwind_tables = 0;

   /* Disable -freorder-blocks-and-partition when unwind tables are being
      emitted for Darwin < 9 (OSX 10.5).
      The strategy is, "Unless the User has specifically set/unset an unwind
      flag we will switch off -freorder-blocks-and-partition when unwind tables
      will be generated".  If the User specifically sets flags... we assume
      (s)he knows why...  */
   if (generating_for_darwin_version < 9
       && global_options_set.x_flag_reorder_blocks_and_partition
       && ((global_options.x_flag_exceptions 		/* User, c++, java */
	    && !global_options_set.x_flag_exceptions) 	/* User specified... */
	   || (global_options.x_flag_unwind_tables
	       && !global_options_set.x_flag_unwind_tables)
	   || (global_options.x_flag_non_call_exceptions
	       && !global_options_set.x_flag_non_call_exceptions)
	   || (global_options.x_flag_asynchronous_unwind_tables
	       && !global_options_set.x_flag_asynchronous_unwind_tables)))
    {
      inform (input_location,
	      "-freorder-blocks-and-partition does not work with exceptions "
	      "on this architecture");
      flag_reorder_blocks_and_partition = 0;
      flag_reorder_blocks = 1;
    }

    /* FIXME: flag_objc_sjlj_exceptions is no longer needed since there is only
       one valid choice of exception scheme for each runtime.  */
    if (!global_options_set.x_flag_objc_sjlj_exceptions)
      global_options.x_flag_objc_sjlj_exceptions = 
				flag_next_runtime && !TARGET_64BIT;

    /* FIXME: and this could be eliminated then too.  */
    if (!global_options_set.x_flag_exceptions
	&& flag_objc_exceptions
	&& TARGET_64BIT)
      flag_exceptions = 1;

  if (flag_mkernel || flag_apple_kext)
    {
      /* -mkernel implies -fapple-kext for C++ */
      if (strcmp (lang_hooks.name, "GNU C++") == 0)
	flag_apple_kext = 1;

      flag_no_common = 1;

      /* No EH in kexts.  */
      flag_exceptions = 0;
      /* No -fnon-call-exceptions data in kexts.  */
      flag_non_call_exceptions = 0;
      /* so no tables either.. */
      flag_unwind_tables = 0;
      flag_asynchronous_unwind_tables = 0;
      /* We still need to emit branch islands for kernel context.  */
      darwin_emit_branch_islands = true;
    }

  if (flag_var_tracking_uninit == 0
      && generating_for_darwin_version >= 9
      && (flag_gtoggle ? (debug_info_level == DINFO_LEVEL_NONE)
      : (debug_info_level >= DINFO_LEVEL_NORMAL))
      && write_symbols == DWARF2_DEBUG)
    flag_var_tracking_uninit = flag_var_tracking;

  if (MACHO_DYNAMIC_NO_PIC_P)
    {
      if (flag_pic)
	warning_at (UNKNOWN_LOCATION, 0,
		 "%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>,"
		 " %<-fpie%> or %<-fPIE%>");
      flag_pic = 0;
    }
  else if (flag_pic == 1)
    {
      /* Darwin's -fpic is -fPIC.  */
      flag_pic = 2;
    }

  /* It is assumed that branch island stubs are needed for earlier systems.  */
  if (generating_for_darwin_version < 9)
    darwin_emit_branch_islands = true;
  else
    emit_aligned_common = true; /* Later systems can support aligned common.  */

  /* The c_dialect...() macros are not available to us here.  */
  darwin_running_cxx = (strstr (lang_hooks.name, "C++") != 0);
}

#if DARWIN_PPC
/* Add $LDBL128 suffix to long double builtins for ppc darwin.  */

static void
darwin_patch_builtin (enum built_in_function fncode)
{
  tree fn = builtin_decl_explicit (fncode);
  tree sym;
  char *newname;

  if (!fn)
    return;

  sym = DECL_ASSEMBLER_NAME (fn);
  newname = ACONCAT (("_", IDENTIFIER_POINTER (sym), "$LDBL128", NULL));

  set_user_assembler_name (fn, newname);

  fn = builtin_decl_implicit (fncode);
  if (fn)
    set_user_assembler_name (fn, newname);
}

void
darwin_patch_builtins (void)
{
  if (LONG_DOUBLE_TYPE_SIZE != 128)
    return;

#define PATCH_BUILTIN(fncode) darwin_patch_builtin (fncode);
#define PATCH_BUILTIN_NO64(fncode)		\
  if (!TARGET_64BIT)				\
    darwin_patch_builtin (fncode);
#define PATCH_BUILTIN_VARIADIC(fncode)				  \
  if (!TARGET_64BIT						  \
      && (strverscmp (darwin_macosx_version_min, "10.3.9") >= 0)) \
    darwin_patch_builtin (fncode);
#include "darwin-ppc-ldouble-patch.def"
#undef PATCH_BUILTIN
#undef PATCH_BUILTIN_NO64
#undef PATCH_BUILTIN_VARIADIC
}
#endif

/*  CFStrings implementation.  */
static GTY(()) tree cfstring_class_reference = NULL_TREE;
static GTY(()) tree cfstring_type_node = NULL_TREE;
static GTY(()) tree ccfstring_type_node = NULL_TREE;
static GTY(()) tree pccfstring_type_node = NULL_TREE;
static GTY(()) tree pcint_type_node = NULL_TREE;
static GTY(()) tree pcchar_type_node = NULL_TREE;

static enum built_in_function darwin_builtin_cfstring;

/* Store all constructed constant CFStrings in a hash table so that
   they get uniqued properly.  */

typedef struct GTY (()) cfstring_descriptor {
  /* The string literal.  */
  tree literal;
  /* The resulting constant CFString.  */
  tree constructor;
} cfstring_descriptor;

static GTY ((param_is (struct cfstring_descriptor))) htab_t cfstring_htab;

static hashval_t cfstring_hash (const void *);
static int cfstring_eq (const void *, const void *);

static tree
add_builtin_field_decl (tree type, const char *name, tree **chain)
{
  tree field = build_decl (BUILTINS_LOCATION, FIELD_DECL, 
			    get_identifier (name), type);

  if (*chain != NULL)
    **chain = field;
  *chain = &DECL_CHAIN (field);

  return field;
}

tree
darwin_init_cfstring_builtins (unsigned builtin_cfstring)
{
  tree cfsfun, fields, pccfstring_ftype_pcchar;
  tree *chain = NULL;

  darwin_builtin_cfstring = 
    (enum built_in_function) builtin_cfstring;
  
  /* struct __builtin_CFString {
       const int *isa;		(will point at
       int flags;		 __CFConstantStringClassReference)
       const char *str;
       long length;
     };  */

  pcint_type_node = build_pointer_type 
		   (build_qualified_type (integer_type_node, TYPE_QUAL_CONST));

  pcchar_type_node = build_pointer_type 
		   (build_qualified_type (char_type_node, TYPE_QUAL_CONST));

  cfstring_type_node = (*lang_hooks.types.make_type) (RECORD_TYPE);

  /* Have to build backwards for finish struct.  */
  fields = add_builtin_field_decl (long_integer_type_node, "length", &chain);
  add_builtin_field_decl (pcchar_type_node, "str", &chain);
  add_builtin_field_decl (integer_type_node, "flags", &chain);
  add_builtin_field_decl (pcint_type_node, "isa", &chain);
  finish_builtin_struct (cfstring_type_node, "__builtin_CFString",
			 fields, NULL_TREE);

  /* const struct __builtin_CFstring *
     __builtin___CFStringMakeConstantString (const char *); */

  ccfstring_type_node = build_qualified_type 
			(cfstring_type_node, TYPE_QUAL_CONST);
  pccfstring_type_node = build_pointer_type (ccfstring_type_node);
  pccfstring_ftype_pcchar = build_function_type_list 
			(pccfstring_type_node, pcchar_type_node, NULL_TREE);

  cfsfun  = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, 
			get_identifier ("__builtin___CFStringMakeConstantString"),
			pccfstring_ftype_pcchar);

  TREE_PUBLIC (cfsfun) = 1;
  DECL_EXTERNAL (cfsfun) = 1;
  DECL_ARTIFICIAL (cfsfun) = 1;
  /* Make a lang-specific section - dup_lang_specific_decl makes a new node
     in place of the existing, which may be NULL.  */
  DECL_LANG_SPECIFIC (cfsfun) = NULL;
  (*lang_hooks.dup_lang_specific_decl) (cfsfun);
  DECL_BUILT_IN_CLASS (cfsfun) = BUILT_IN_MD;
  DECL_FUNCTION_CODE (cfsfun) = darwin_builtin_cfstring;
  lang_hooks.builtin_function (cfsfun);

  /* extern int __CFConstantStringClassReference[];  */
  cfstring_class_reference = build_decl (BUILTINS_LOCATION, VAR_DECL,
		 get_identifier ("__CFConstantStringClassReference"),
		 build_array_type (integer_type_node, NULL_TREE));

  TREE_PUBLIC (cfstring_class_reference) = 1;
  DECL_ARTIFICIAL (cfstring_class_reference) = 1;
  (*lang_hooks.decls.pushdecl) (cfstring_class_reference);
  DECL_EXTERNAL (cfstring_class_reference) = 1;
  rest_of_decl_compilation (cfstring_class_reference, 0, 0);
  
  /* Initialize the hash table used to hold the constant CFString objects.  */
  cfstring_htab = htab_create_ggc (31, cfstring_hash, cfstring_eq, NULL);

  return cfstring_type_node;
}

tree
darwin_fold_builtin (tree fndecl, int n_args, tree *argp, 
		     bool ARG_UNUSED (ignore))
{
  unsigned int fcode = DECL_FUNCTION_CODE (fndecl);
  
  if (fcode == darwin_builtin_cfstring)
    {
      if (!darwin_constant_cfstrings)
	{
	  error ("built-in function %qD requires the" 
		 " %<-mconstant-cfstrings%> flag", fndecl);
	  return error_mark_node;
	}

      if (n_args != 1)
	{
	  error ("built-in function %qD takes one argument only", fndecl);
	  return error_mark_node;
	}

      return darwin_build_constant_cfstring (*argp);
    }

  return NULL_TREE;
}

void
darwin_rename_builtins (void)
{
  /* The system ___divdc3 routine in libSystem on darwin10 is not
     accurate to 1ulp, ours is, so we avoid ever using the system name
     for this routine and instead install a non-conflicting name that
     is accurate.

     When -ffast-math or -funsafe-math-optimizations is given, we can
     use the faster version.  */
  if (!flag_unsafe_math_optimizations)
    {
      enum built_in_function dcode
	= (enum built_in_function)(BUILT_IN_COMPLEX_DIV_MIN
				   + DCmode - MIN_MODE_COMPLEX_FLOAT);
      tree fn = builtin_decl_explicit (dcode);
      /* Fortran and c call TARGET_INIT_BUILTINS and
	 TARGET_INIT_LIBFUNCS at different times, so we have to put a
	 call into each to ensure that at least one of them is called
	 after build_common_builtin_nodes.  A better fix is to add a
	 new hook to run after build_common_builtin_nodes runs.  */
      if (fn)
	set_user_assembler_name (fn, "___ieee_divdc3");
      fn = builtin_decl_implicit (dcode);
      if (fn)
	set_user_assembler_name (fn, "___ieee_divdc3");
    }
}

bool
darwin_libc_has_function (enum function_class fn_class)
{
  if (fn_class == function_sincos)
    return false;
  if (fn_class == function_c99_math_complex
      || fn_class == function_c99_misc)
    return (TARGET_64BIT
	    || strverscmp (darwin_macosx_version_min, "10.3") >= 0);

  return true;
}

static hashval_t
cfstring_hash (const void *ptr)
{
  tree str = ((const struct cfstring_descriptor *)ptr)->literal;
  const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str);
  int i, len = TREE_STRING_LENGTH (str);
  hashval_t h = len;

  for (i = 0; i < len; i++)
    h = ((h * 613) + p[i]);

  return h;
}

static int
cfstring_eq (const void *ptr1, const void *ptr2)
{
  tree str1 = ((const struct cfstring_descriptor *)ptr1)->literal;
  tree str2 = ((const struct cfstring_descriptor *)ptr2)->literal;
  int len1 = TREE_STRING_LENGTH (str1);

  return (len1 == TREE_STRING_LENGTH (str2)
	  && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2),
		      len1));
}

tree
darwin_build_constant_cfstring (tree str)
{
  struct cfstring_descriptor *desc, key;
  void **loc;
  tree addr;

  if (!str)
    {
      error ("CFString literal is missing");
      return error_mark_node;
    }

  STRIP_NOPS (str);

  if (TREE_CODE (str) == ADDR_EXPR)
    str = TREE_OPERAND (str, 0);

  if (TREE_CODE (str) != STRING_CST)
    {
      error ("CFString literal expression is not a string constant");
      return error_mark_node;
    }

  /* Perhaps we already constructed a constant CFString just like this one? */
  key.literal = str;
  loc = htab_find_slot (cfstring_htab, &key, INSERT);
  desc = (struct cfstring_descriptor *) *loc;

  if (!desc)
    {
      tree var, constructor, field;
      vec<constructor_elt, va_gc> *v = NULL;
      int length = TREE_STRING_LENGTH (str) - 1;

      if (darwin_warn_nonportable_cfstrings)
	{
	  const char *s = TREE_STRING_POINTER (str);
	  int l = 0;

	  for (l = 0; l < length; l++)
	    if (!s[l] || !isascii (s[l]))
	      {
		warning (darwin_warn_nonportable_cfstrings, "%s in CFString literal",
			 s[l] ? "non-ASCII character" : "embedded NUL");
		break;
	      }
	}

      *loc = desc = ggc_alloc_cleared_cfstring_descriptor ();
      desc->literal = str;

      /* isa *. */
      field = TYPE_FIELDS (ccfstring_type_node);
      CONSTRUCTOR_APPEND_ELT(v, NULL_TREE, 
			     build1 (ADDR_EXPR,  TREE_TYPE (field),  
				     cfstring_class_reference));
      /* flags */
      field = DECL_CHAIN (field);
      CONSTRUCTOR_APPEND_ELT(v, NULL_TREE, 
			     build_int_cst (TREE_TYPE (field), 0x000007c8));
      /* string *. */
      field = DECL_CHAIN (field);
      CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
			     build1 (ADDR_EXPR, TREE_TYPE (field), str));
      /* length */
      field = DECL_CHAIN (field);
      CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
			     build_int_cst (TREE_TYPE (field), length));

      constructor = build_constructor (ccfstring_type_node, v);
      TREE_READONLY (constructor) = 1;
      TREE_CONSTANT (constructor) = 1;
      TREE_STATIC (constructor) = 1;

      /* Fromage: The C++ flavor of 'build_unary_op' expects constructor nodes
	 to have the TREE_HAS_CONSTRUCTOR (...) bit set.  However, this file is
	 being built without any knowledge of C++ tree accessors; hence, we shall
	 use the generic accessor that TREE_HAS_CONSTRUCTOR actually maps to!  */
      if (darwin_running_cxx)
	TREE_LANG_FLAG_4 (constructor) = 1;  /* TREE_HAS_CONSTRUCTOR  */

      /* Create an anonymous global variable for this CFString.  */
      var = build_decl (input_location, CONST_DECL, 
			NULL, TREE_TYPE (constructor));
      DECL_ARTIFICIAL (var) = 1;
      TREE_STATIC (var) = 1;
      DECL_INITIAL (var) = constructor;
      /* FIXME: This should use a translation_unit_decl to indicate file scope.  */
      DECL_CONTEXT (var) = NULL_TREE;
      desc->constructor = var;
    }

  addr = build1 (ADDR_EXPR, pccfstring_type_node, desc->constructor);
  TREE_CONSTANT (addr) = 1;

  return addr;
}

bool
darwin_cfstring_p (tree str)
{
  struct cfstring_descriptor key;
  void **loc;

  if (!str)
    return false;

  STRIP_NOPS (str);

  if (TREE_CODE (str) == ADDR_EXPR)
    str = TREE_OPERAND (str, 0);

  if (TREE_CODE (str) != STRING_CST)
    return false;

  key.literal = str;
  loc = htab_find_slot (cfstring_htab, &key, NO_INSERT);
  
  if (loc)
    return true;

  return false;
}

void
darwin_enter_string_into_cfstring_table (tree str)
{
  struct cfstring_descriptor key;
  void **loc;

  key.literal = str;
  loc = htab_find_slot (cfstring_htab, &key, INSERT);

  if (!*loc)
    {
      *loc = ggc_alloc_cleared_cfstring_descriptor ();
      ((struct cfstring_descriptor *)*loc)->literal = str;
    }
}

/* Choose named function section based on its frequency.  */

section *
darwin_function_section (tree decl, enum node_frequency freq,
			  bool startup, bool exit)
{
  /* Decide if we need to put this in a coalescable section.  */
  bool weak = (decl 
	       && DECL_WEAK (decl)
	       && (!DECL_ATTRIBUTES (decl)
		   || !lookup_attribute ("weak_import", 
					  DECL_ATTRIBUTES (decl))));

  /* If there is a specified section name, we should not be trying to
     override.  */
  if (decl && DECL_SECTION_NAME (decl) != NULL_TREE)
    return get_named_section (decl, NULL, 0);

  /* Default when there is no function re-ordering.  */
  if (!flag_reorder_functions)
    return (weak)
	    ? darwin_sections[text_coal_section]
	    : text_section;

  /* Startup code should go to startup subsection unless it is
     unlikely executed (this happens especially with function splitting
     where we can split away unnecessary parts of static constructors).  */
  if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
    return (weak)
	    ? darwin_sections[text_startup_coal_section]
	    : darwin_sections[text_startup_section];

  /* Similarly for exit.  */
  if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
    return (weak)
	    ? darwin_sections[text_exit_coal_section]
	    : darwin_sections[text_exit_section];

  /* Group cold functions together, similarly for hot code.  */
  switch (freq)
    {
      case NODE_FREQUENCY_UNLIKELY_EXECUTED:
	return (weak)
		? darwin_sections[text_cold_coal_section]
		: darwin_sections[text_cold_section];
	break;
      case NODE_FREQUENCY_HOT:
	return (weak)
		? darwin_sections[text_hot_coal_section]
		: darwin_sections[text_hot_section];
	break;
      default:
	return (weak)
		? darwin_sections[text_coal_section]
		: text_section;
	break;
    }
}

/* When a function is partitioned between sections, we need to insert a label
   at the start of each new chunk - so that it may become a valid 'atom' for
   eh and debug purposes.  Without this the linker will emit warnings if one 
   tries to add line location information (since the switched fragment will 
   be anonymous).  */

void
darwin_function_switched_text_sections (FILE *fp, tree decl, bool new_is_cold)
{
  char buf[128];
  snprintf (buf, 128, "%s%s",new_is_cold?"__cold_sect_of_":"__hot_sect_of_",
	    IDENTIFIER_POINTER (DECL_NAME (decl)));
  /* Make sure we pick up all the relevant quotes etc.  */
  assemble_name_raw (fp, (const char *) buf);
  fputs (":\n", fp);
}

#include "gt-darwin.h"