aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.4.3/gcc/cfgexpand.c
blob: 66acd3c75e893b58d0bd5c47b40778fb391d07bf (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
/* A pass for lowering trees to RTL.
   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
   Free Software Foundation, 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 "tree.h"
#include "rtl.h"
#include "tm_p.h"
#include "basic-block.h"
#include "function.h"
#include "expr.h"
#include "langhooks.h"
#include "tree-flow.h"
#include "timevar.h"
#include "tree-dump.h"
#include "tree-pass.h"
#include "except.h"
#include "flags.h"
#include "diagnostic.h"
#include "toplev.h"
#include "debug.h"
#include "params.h"
#include "tree-inline.h"
#include "value-prof.h"
#include "target.h"
#include "tree-stack-overlay.h"

/* Return an expression tree corresponding to the RHS of GIMPLE
   statement STMT.  */

tree
gimple_assign_rhs_to_tree (gimple stmt)
{
  tree t;
  enum gimple_rhs_class grhs_class;
    
  grhs_class = get_gimple_rhs_class (gimple_expr_code (stmt));

  if (grhs_class == GIMPLE_BINARY_RHS)
    t = build2 (gimple_assign_rhs_code (stmt),
		TREE_TYPE (gimple_assign_lhs (stmt)),
		gimple_assign_rhs1 (stmt),
		gimple_assign_rhs2 (stmt));
  else if (grhs_class == GIMPLE_UNARY_RHS)
    t = build1 (gimple_assign_rhs_code (stmt),
		TREE_TYPE (gimple_assign_lhs (stmt)),
		gimple_assign_rhs1 (stmt));
  else if (grhs_class == GIMPLE_SINGLE_RHS)
    t = gimple_assign_rhs1 (stmt);
  else
    gcc_unreachable ();

  if (gimple_has_location (stmt) && CAN_HAVE_LOCATION_P (t))
    SET_EXPR_LOCATION (t, gimple_location (stmt));

  return t;
}

/* Return an expression tree corresponding to the PREDICATE of GIMPLE_COND
   statement STMT.  */

static tree
gimple_cond_pred_to_tree (gimple stmt)
{
  return build2 (gimple_cond_code (stmt), boolean_type_node,
		 gimple_cond_lhs (stmt), gimple_cond_rhs (stmt));
}

/* Helper for gimple_to_tree.  Set EXPR_LOCATION for every expression
   inside *TP.  DATA is the location to set.  */

static tree
set_expr_location_r (tree *tp, int *ws ATTRIBUTE_UNUSED, void *data)
{
  location_t *loc = (location_t *) data;
  if (EXPR_P (*tp))
    SET_EXPR_LOCATION (*tp, *loc);

  return NULL_TREE;
}


/* RTL expansion has traditionally been done on trees, so the
   transition to doing it on GIMPLE tuples is very invasive to the RTL
   expander.  To facilitate the transition, this function takes a
   GIMPLE tuple STMT and returns the same statement in the form of a
   tree.  */

static tree
gimple_to_tree (gimple stmt)
{
  tree t;
  int rn;
  tree_ann_common_t ann;
  location_t loc;

  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      {
	tree lhs = gimple_assign_lhs (stmt);

	t = gimple_assign_rhs_to_tree (stmt);
	t = build2 (MODIFY_EXPR, TREE_TYPE (lhs), lhs, t);
	if (gimple_assign_nontemporal_move_p (stmt))
	  MOVE_NONTEMPORAL (t) = true;
      }
      break;
	                                 
    case GIMPLE_COND:
      t = gimple_cond_pred_to_tree (stmt);
      t = build3 (COND_EXPR, void_type_node, t, NULL_TREE, NULL_TREE);
      break;

    case GIMPLE_GOTO:
      t = build1 (GOTO_EXPR, void_type_node, gimple_goto_dest (stmt));
      break;

    case GIMPLE_LABEL:
      t = build1 (LABEL_EXPR, void_type_node, gimple_label_label (stmt));
      break;

    case GIMPLE_RETURN:
      {
	tree retval = gimple_return_retval (stmt);

	if (retval && retval != error_mark_node)
	  {
	    tree result = DECL_RESULT (current_function_decl);

	    /* If we are not returning the current function's RESULT_DECL,
	       build an assignment to it.  */
	    if (retval != result)
	      {
		/* I believe that a function's RESULT_DECL is unique.  */
		gcc_assert (TREE_CODE (retval) != RESULT_DECL);

		retval = build2 (MODIFY_EXPR, TREE_TYPE (result),
				 result, retval);
	      }
	  }
	t = build1 (RETURN_EXPR, void_type_node, retval);
      }
      break;

    case GIMPLE_ASM:
      {
	size_t i, n;
	tree out, in, cl;
	const char *s;

	out = NULL_TREE;
	n = gimple_asm_noutputs (stmt);
	if (n > 0)
	  {
	    t = out = gimple_asm_output_op (stmt, 0);
	    for (i = 1; i < n; i++)
	      {
		TREE_CHAIN (t) = gimple_asm_output_op (stmt, i);
		t = gimple_asm_output_op (stmt, i);
	      }
	  }

	in = NULL_TREE;
	n = gimple_asm_ninputs (stmt);
	if (n > 0)
	  {
	    t = in = gimple_asm_input_op (stmt, 0);
	    for (i = 1; i < n; i++)
	      {
		TREE_CHAIN (t) = gimple_asm_input_op (stmt, i);
		t = gimple_asm_input_op (stmt, i);
	      }
	  }

	cl = NULL_TREE;
	n = gimple_asm_nclobbers (stmt);
	if (n > 0)
	  {
	    t = cl = gimple_asm_clobber_op (stmt, 0);
	    for (i = 1; i < n; i++)
	      {
		TREE_CHAIN (t) = gimple_asm_clobber_op (stmt, i);
		t = gimple_asm_clobber_op (stmt, i);
	      }
	  }

	s = gimple_asm_string (stmt);
	t = build4 (ASM_EXPR, void_type_node, build_string (strlen (s), s),
	            out, in, cl);
        ASM_VOLATILE_P (t) = gimple_asm_volatile_p (stmt);
        ASM_INPUT_P (t) = gimple_asm_input_p (stmt);
      }
    break;

    case GIMPLE_CALL:
      {
	size_t i;
        tree fn;
	tree_ann_common_t ann;
        
	t = build_vl_exp (CALL_EXPR, gimple_call_num_args (stmt) + 3);

        CALL_EXPR_FN (t) = gimple_call_fn (stmt);
        TREE_TYPE (t) = gimple_call_return_type (stmt);
	CALL_EXPR_STATIC_CHAIN (t) = gimple_call_chain (stmt);

	for (i = 0; i < gimple_call_num_args (stmt); i++)
	  CALL_EXPR_ARG (t, i) = gimple_call_arg (stmt, i);

	if (!(gimple_call_flags (stmt) & (ECF_CONST | ECF_PURE)))
	  TREE_SIDE_EFFECTS (t) = 1;

	if (gimple_call_flags (stmt) & ECF_NOTHROW)
	  TREE_NOTHROW (t) = 1;

        CALL_EXPR_TAILCALL (t) = gimple_call_tail_p (stmt);
        CALL_EXPR_RETURN_SLOT_OPT (t) = gimple_call_return_slot_opt_p (stmt);
        CALL_FROM_THUNK_P (t) = gimple_call_from_thunk_p (stmt);
        CALL_CANNOT_INLINE_P (t) = gimple_call_cannot_inline_p (stmt);
        CALL_EXPR_VA_ARG_PACK (t) = gimple_call_va_arg_pack_p (stmt);

        /* If the call has a LHS then create a MODIFY_EXPR to hold it.  */
	{
	  tree lhs = gimple_call_lhs (stmt);

	  if (lhs)
	    t = build2 (MODIFY_EXPR, TREE_TYPE (lhs), lhs, t);
	}

        /* Record the original call statement, as it may be used
           to retrieve profile information during expansion.  */

	if ((fn = gimple_call_fndecl (stmt)) != NULL_TREE
	    && DECL_BUILT_IN (fn))
	  {
	    ann = get_tree_common_ann (t);
	    ann->stmt = stmt;
	    /* Add an annotation to the CALL_EXPR on the RHS so the builtin 
               expander can find the original statement.  */
	    if (TREE_CODE (t) == MODIFY_EXPR)
	      {
	        ann = get_tree_common_ann (TREE_OPERAND (t, 1));
	        ann->stmt = stmt;
	      }
	  }
      }
    break;

    case GIMPLE_SWITCH:
      {
	tree label_vec;
	size_t i;
	tree elt = gimple_switch_label (stmt, 0);

	label_vec = make_tree_vec (gimple_switch_num_labels (stmt));

	if (!CASE_LOW (elt) && !CASE_HIGH (elt))
	  {
	    for (i = 1; i < gimple_switch_num_labels (stmt); i++)
	      TREE_VEC_ELT (label_vec, i - 1) = gimple_switch_label (stmt, i);

	    /* The default case in a SWITCH_EXPR must be at the end of
	       the label vector.  */
	    TREE_VEC_ELT (label_vec, i - 1) = gimple_switch_label (stmt, 0);
	  }
	else
	  {
	    for (i = 0; i < gimple_switch_num_labels (stmt); i++)
	      TREE_VEC_ELT (label_vec, i) = gimple_switch_label (stmt, i);
	  }

	t = build3 (SWITCH_EXPR, void_type_node, gimple_switch_index (stmt),
		    NULL, label_vec);
      }
    break;

    case GIMPLE_NOP:
    case GIMPLE_PREDICT:
      t = build1 (NOP_EXPR, void_type_node, size_zero_node);
      break;

    case GIMPLE_RESX:
      t = build_resx (gimple_resx_region (stmt));
      break;
	
    default:
      if (errorcount == 0)
	{
	  error ("Unrecognized GIMPLE statement during RTL expansion");
	  print_gimple_stmt (stderr, stmt, 4, 0);
	  gcc_unreachable ();
	}
      else
	{
	  /* Ignore any bad gimple codes if we're going to die anyhow,
	     so we can at least set TREE_ASM_WRITTEN and have the rest
	     of compilation advance without sudden ICE death.  */
	  t = build1 (NOP_EXPR, void_type_node, size_zero_node);
	  break;
	}
    }

  /* If STMT is inside an exception region, record it in the generated
     expression.  */
  rn = lookup_stmt_eh_region (stmt);
  if (rn >= 0)
    {
      tree call = get_call_expr_in (t);

      ann = get_tree_common_ann (t);
      ann->rn = rn;
      
      /* For a CALL_EXPR on the RHS of an assignment, calls.c looks up
 	 the CALL_EXPR not the assignment statment for EH region number. */
      if (call && call != t)
	{
	  ann = get_tree_common_ann (call);
	  ann->rn = rn;
	}
    }

  /* Set EXPR_LOCATION in all the embedded expressions.  */
  loc = gimple_location (stmt);
  walk_tree (&t, set_expr_location_r, (void *) &loc, NULL);

  TREE_BLOCK (t) = gimple_block (stmt);

  return t;
}


/* Release back to GC memory allocated by gimple_to_tree.  */

static void
release_stmt_tree (gimple stmt, tree stmt_tree)
{
  tree_ann_common_t ann;

  switch (gimple_code (stmt))
    {
    case GIMPLE_ASSIGN:
      if (get_gimple_rhs_class (gimple_expr_code (stmt)) != GIMPLE_SINGLE_RHS)
	ggc_free (TREE_OPERAND (stmt_tree, 1));
      break;
    case GIMPLE_COND:
      ggc_free (COND_EXPR_COND (stmt_tree));
      break;
    case GIMPLE_RETURN:
      if (TREE_OPERAND (stmt_tree, 0)
	  && TREE_CODE (TREE_OPERAND (stmt_tree, 0)) == MODIFY_EXPR)
	ggc_free (TREE_OPERAND (stmt_tree, 0));
      break;
    case GIMPLE_CALL:
      if (gimple_call_lhs (stmt))
	{
	  ann = tree_common_ann (TREE_OPERAND (stmt_tree, 1));
	  if (ann)
	    ggc_free (ann);
	  ggc_free (TREE_OPERAND (stmt_tree, 1));
	}
      break;
    default:
      break;
    }
  ann = tree_common_ann (stmt_tree);
  if (ann)
    ggc_free (ann);
  ggc_free (stmt_tree);
}


/* Verify that there is exactly single jump instruction since last and attach
   REG_BR_PROB note specifying probability.
   ??? We really ought to pass the probability down to RTL expanders and let it
   re-distribute it when the conditional expands into multiple conditionals.
   This is however difficult to do.  */
void
add_reg_br_prob_note (rtx last, int probability)
{
  if (profile_status == PROFILE_ABSENT)
    return;
  for (last = NEXT_INSN (last); last && NEXT_INSN (last); last = NEXT_INSN (last))
    if (JUMP_P (last))
      {
	/* It is common to emit condjump-around-jump sequence when we don't know
	   how to reverse the conditional.  Special case this.  */
	if (!any_condjump_p (last)
	    || !JUMP_P (NEXT_INSN (last))
	    || !simplejump_p (NEXT_INSN (last))
	    || !NEXT_INSN (NEXT_INSN (last))
	    || !BARRIER_P (NEXT_INSN (NEXT_INSN (last)))
	    || !NEXT_INSN (NEXT_INSN (NEXT_INSN (last)))
	    || !LABEL_P (NEXT_INSN (NEXT_INSN (NEXT_INSN (last))))
	    || NEXT_INSN (NEXT_INSN (NEXT_INSN (NEXT_INSN (last)))))
	  goto failed;
	gcc_assert (!find_reg_note (last, REG_BR_PROB, 0));
	add_reg_note (last, REG_BR_PROB,
		      GEN_INT (REG_BR_PROB_BASE - probability));
	return;
      }
  if (!last || !JUMP_P (last) || !any_condjump_p (last))
    goto failed;
  gcc_assert (!find_reg_note (last, REG_BR_PROB, 0));
  add_reg_note (last, REG_BR_PROB, GEN_INT (probability));
  return;
failed:
  if (dump_file)
    fprintf (dump_file, "Failed to add probability note\n");
}


#ifndef STACK_ALIGNMENT_NEEDED
#define STACK_ALIGNMENT_NEEDED 1
#endif


/* This structure holds data relevant to one variable that will be
   placed in a stack slot.  */
struct stack_var
{
  /* The Variable.  */
  tree decl;

  /* The offset of the variable.  During partitioning, this is the
     offset relative to the partition.  After partitioning, this
     is relative to the stack frame.  */
  HOST_WIDE_INT offset;

  /* Initially, the size of the variable.  Later, the size of the partition,
     if this variable becomes it's partition's representative.  */
  HOST_WIDE_INT size;

  /* The *byte* alignment required for this variable.  Or as, with the
     size, the alignment for this partition.  */
  unsigned int alignb;

  /* The partition representative.  */
  size_t representative;

  /* The next stack variable in the partition, or EOC.  */
  size_t next;
};

#define EOC  ((size_t)-1)

/* We have an array of such objects while deciding allocation.  */
static struct stack_var *stack_vars;
static size_t stack_vars_alloc;
static size_t stack_vars_num;

/* An array of indices such that stack_vars[stack_vars_sorted[i]].size
   is non-decreasing.  */
static size_t *stack_vars_sorted;

/* We have an interference graph between such objects.  This graph
   is lower triangular.  */
static bool *stack_vars_conflict;
static size_t stack_vars_conflict_alloc;

/* The phase of the stack frame.  This is the known misalignment of
   virtual_stack_vars_rtx from PREFERRED_STACK_BOUNDARY.  That is,
   (frame_offset+frame_phase) % PREFERRED_STACK_BOUNDARY == 0.  */
static int frame_phase;

/* Used during expand_used_vars to remember if we saw any decls for
   which we'd like to enable stack smashing protection.  */
static bool has_protected_decls;

/* Used during expand_used_vars.  Remember if we say a character buffer
   smaller than our cutoff threshold.  Used for -Wstack-protector.  */
static bool has_short_buffer;

/* Discover the byte alignment to use for DECL.  Ignore alignment
   we can't do with expected alignment of the stack boundary.  */

static unsigned int
get_decl_align_unit (tree decl)
{
  unsigned int align;

  align = LOCAL_DECL_ALIGNMENT (decl);

  if (align > MAX_SUPPORTED_STACK_ALIGNMENT)
    align = MAX_SUPPORTED_STACK_ALIGNMENT;

  if (SUPPORTS_STACK_ALIGNMENT)
    {
      if (crtl->stack_alignment_estimated < align)
	{
	  gcc_assert(!crtl->stack_realign_processed);
          crtl->stack_alignment_estimated = align;
	}
    }

  /* stack_alignment_needed > PREFERRED_STACK_BOUNDARY is permitted.
     So here we only make sure stack_alignment_needed >= align.  */
  if (crtl->stack_alignment_needed < align)
    crtl->stack_alignment_needed = align;
  if (crtl->max_used_stack_slot_alignment < crtl->stack_alignment_needed)
    crtl->max_used_stack_slot_alignment = crtl->stack_alignment_needed;

  return align / BITS_PER_UNIT;
}

/* Allocate SIZE bytes at byte alignment ALIGN from the stack frame.
   Return the frame offset.  */

static HOST_WIDE_INT
alloc_stack_frame_space (HOST_WIDE_INT size, HOST_WIDE_INT align)
{
  HOST_WIDE_INT offset, new_frame_offset;

  new_frame_offset = frame_offset;
  if (FRAME_GROWS_DOWNWARD)
    {
      new_frame_offset -= size + frame_phase;
      new_frame_offset &= -align;
      new_frame_offset += frame_phase;
      offset = new_frame_offset;
    }
  else
    {
      new_frame_offset -= frame_phase;
      new_frame_offset += align - 1;
      new_frame_offset &= -align;
      new_frame_offset += frame_phase;
      offset = new_frame_offset;
      new_frame_offset += size;
    }
  frame_offset = new_frame_offset;

  if (frame_offset_overflow (frame_offset, cfun->decl))
    frame_offset = offset = 0;

  return offset;
}

/* Accumulate DECL into STACK_VARS.  */

static void
add_stack_var (tree decl)
{
  if (stack_vars_num >= stack_vars_alloc)
    {
      if (stack_vars_alloc)
	stack_vars_alloc = stack_vars_alloc * 3 / 2;
      else
	stack_vars_alloc = 32;
      stack_vars
	= XRESIZEVEC (struct stack_var, stack_vars, stack_vars_alloc);
    }
  stack_vars[stack_vars_num].decl = decl;
  stack_vars[stack_vars_num].offset = 0;
  stack_vars[stack_vars_num].size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
  stack_vars[stack_vars_num].alignb = get_decl_align_unit (decl);

  /* All variables are initially in their own partition.  */
  stack_vars[stack_vars_num].representative = stack_vars_num;
  stack_vars[stack_vars_num].next = EOC;

  /* Ensure that this decl doesn't get put onto the list twice.  */
  SET_DECL_RTL (decl, pc_rtx);

  stack_vars_num++;
}

/* Compute the linear index of a lower-triangular coordinate (I, J).  */

static size_t
triangular_index (size_t i, size_t j)
{
  if (i < j)
    {
      size_t t;
      t = i, i = j, j = t;
    }
  return (i * (i + 1)) / 2 + j;
}

/* Ensure that STACK_VARS_CONFLICT is large enough for N objects.  */

static void
resize_stack_vars_conflict (size_t n)
{
  size_t size = triangular_index (n-1, n-1) + 1;

  if (size <= stack_vars_conflict_alloc)
    return;

  stack_vars_conflict = XRESIZEVEC (bool, stack_vars_conflict, size);
  memset (stack_vars_conflict + stack_vars_conflict_alloc, 0,
	  (size - stack_vars_conflict_alloc) * sizeof (bool));
  stack_vars_conflict_alloc = size;
}

/* Make the decls associated with luid's X and Y conflict.  */

static void
add_stack_var_conflict (size_t x, size_t y)
{
  size_t index = triangular_index (x, y);
  gcc_assert (index < stack_vars_conflict_alloc);
  stack_vars_conflict[index] = true;
}

/* Check whether the decls associated with luid's X and Y conflict.  */

static bool
stack_var_conflict_p (size_t x, size_t y)
{
  size_t index = triangular_index (x, y);
  gcc_assert (index < stack_vars_conflict_alloc);
  return stack_vars_conflict[index];
}
 
/* Returns true if TYPE is or contains a union type.  */

static bool
aggregate_contains_union_type (tree type)
{
  tree field;

  if (TREE_CODE (type) == UNION_TYPE
      || TREE_CODE (type) == QUAL_UNION_TYPE)
    return true;
  if (TREE_CODE (type) == ARRAY_TYPE)
    return aggregate_contains_union_type (TREE_TYPE (type));
  if (TREE_CODE (type) != RECORD_TYPE)
    return false;

  for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
    if (TREE_CODE (field) == FIELD_DECL)
      if (aggregate_contains_union_type (TREE_TYPE (field)))
	return true;

  return false;
}

/* A subroutine of expand_used_vars.  If two variables X and Y have alias
   sets that do not conflict, then do add a conflict for these variables
   in the interference graph.  We also need to make sure to add conflicts
   for union containing structures.  Else RTL alias analysis comes along
   and due to type based aliasing rules decides that for two overlapping
   union temporaries { short s; int i; } accesses to the same mem through
   different types may not alias and happily reorders stores across
   life-time boundaries of the temporaries (See PR25654).
   We also have to mind MEM_IN_STRUCT_P and MEM_SCALAR_P.  */

static void
add_alias_set_conflicts (void)
{
  size_t i, j, n = stack_vars_num;

  for (i = 0; i < n; ++i)
    {
      tree type_i = TREE_TYPE (stack_vars[i].decl);
      bool aggr_i = AGGREGATE_TYPE_P (type_i);
      bool contains_union;

      contains_union = aggregate_contains_union_type (type_i);
      for (j = 0; j < i; ++j)
	{
	  tree type_j = TREE_TYPE (stack_vars[j].decl);
	  bool aggr_j = AGGREGATE_TYPE_P (type_j);
	  if (aggr_i != aggr_j
	      /* Either the objects conflict by means of type based
		 aliasing rules, or we need to add a conflict.  */
	      || !objects_must_conflict_p (type_i, type_j)
	      /* In case the types do not conflict ensure that access
		 to elements will conflict.  In case of unions we have
		 to be careful as type based aliasing rules may say
		 access to the same memory does not conflict.  So play
		 safe and add a conflict in this case.  */
	      || contains_union)
	    add_stack_var_conflict (i, j);
	}
    }
}

/* A subroutine of partition_stack_vars.  A comparison function for qsort,
   sorting an array of indices by the size of the object.  */

static int
stack_var_size_cmp (const void *a, const void *b)
{
  HOST_WIDE_INT sa = stack_vars[*(const size_t *)a].size;
  HOST_WIDE_INT sb = stack_vars[*(const size_t *)b].size;
  unsigned int uida = DECL_UID (stack_vars[*(const size_t *)a].decl);
  unsigned int uidb = DECL_UID (stack_vars[*(const size_t *)b].decl);

  if (sa < sb)
    return -1;
  if (sa > sb)
    return 1;
  /* For stack variables of the same size use the uid of the decl
     to make the sort stable.  */
  if (uida < uidb)
    return -1;
  if (uida > uidb)
    return 1;
  return 0;
}

/* A subroutine of partition_stack_vars.  The UNION portion of a UNION/FIND
   partitioning algorithm.  Partitions A and B are known to be non-conflicting.
   Merge them into a single partition A.

   At the same time, add OFFSET to all variables in partition B.  At the end
   of the partitioning process we've have a nice block easy to lay out within
   the stack frame.  */

static void
union_stack_vars (size_t a, size_t b, HOST_WIDE_INT offset)
{
  size_t i, last;

  /* Update each element of partition B with the given offset,
     and merge them into partition A.  */
  for (last = i = b; i != EOC; last = i, i = stack_vars[i].next)
    {
      stack_vars[i].offset += offset;
      stack_vars[i].representative = a;
    }
  stack_vars[last].next = stack_vars[a].next;
  stack_vars[a].next = b;

  /* Update the required alignment of partition A to account for B.  */
  if (stack_vars[a].alignb < stack_vars[b].alignb)
    stack_vars[a].alignb = stack_vars[b].alignb;

  /* Update the interference graph and merge the conflicts.  */
  for (last = stack_vars_num, i = 0; i < last; ++i)
    if (stack_var_conflict_p (b, i))
      add_stack_var_conflict (a, i);
}

/* A subroutine of expand_used_vars.  Binpack the variables into
   partitions constrained by the interference graph.  The overall
   algorithm used is as follows:

	Sort the objects by size.
	For each object A {
	  S = size(A)
	  O = 0
	  loop {
	    Look for the largest non-conflicting object B with size <= S.
	    UNION (A, B)
	    offset(B) = O
	    O += size(B)
	    S -= size(B)
	  }
	}
*/

static void
partition_stack_vars (void)
{
  size_t si, sj, n = stack_vars_num;

  stack_vars_sorted = XNEWVEC (size_t, stack_vars_num);
  for (si = 0; si < n; ++si)
    stack_vars_sorted[si] = si;

  if (n == 1)
    return;

  qsort (stack_vars_sorted, n, sizeof (size_t), stack_var_size_cmp);

  /* Special case: detect when all variables conflict, and thus we can't
     do anything during the partitioning loop.  It isn't uncommon (with
     C code at least) to declare all variables at the top of the function,
     and if we're not inlining, then all variables will be in the same scope.
     Take advantage of very fast libc routines for this scan.  */
  gcc_assert (sizeof(bool) == sizeof(char));
  if (memchr (stack_vars_conflict, false, stack_vars_conflict_alloc) == NULL)
    return;

  for (si = 0; si < n; ++si)
    {
      size_t i = stack_vars_sorted[si];
      HOST_WIDE_INT isize = stack_vars[i].size;
      HOST_WIDE_INT offset = 0;

      for (sj = si; sj-- > 0; )
	{
	  size_t j = stack_vars_sorted[sj];
	  HOST_WIDE_INT jsize = stack_vars[j].size;
	  unsigned int jalign = stack_vars[j].alignb;

	  /* Ignore objects that aren't partition representatives.  */
	  if (stack_vars[j].representative != j)
	    continue;

	  /* Ignore objects too large for the remaining space.  */
	  if (isize < jsize)
	    continue;

	  /* Ignore conflicting objects.  */
	  if (stack_var_conflict_p (i, j))
	    continue;

	  /* Refine the remaining space check to include alignment.  */
	  if (offset & (jalign - 1))
	    {
	      HOST_WIDE_INT toff = offset;
	      toff += jalign - 1;
	      toff &= -(HOST_WIDE_INT)jalign;
	      if (isize - (toff - offset) < jsize)
		continue;

	      isize -= toff - offset;
	      offset = toff;
	    }

	  /* UNION the objects, placing J at OFFSET.  */
	  union_stack_vars (i, j, offset);

	  isize -= jsize;
	  if (isize == 0)
	    break;
	}
    }
}

/* A debugging aid for expand_used_vars.  Dump the generated partitions.  */

static void
dump_stack_var_partition (void)
{
  size_t si, i, j, n = stack_vars_num;

  for (si = 0; si < n; ++si)
    {
      i = stack_vars_sorted[si];

      /* Skip variables that aren't partition representatives, for now.  */
      if (stack_vars[i].representative != i)
	continue;

      fprintf (dump_file, "Partition %lu: size " HOST_WIDE_INT_PRINT_DEC
	       " align %u\n", (unsigned long) i, stack_vars[i].size,
	       stack_vars[i].alignb);

      for (j = i; j != EOC; j = stack_vars[j].next)
	{
	  fputc ('\t', dump_file);
	  print_generic_expr (dump_file, stack_vars[j].decl, dump_flags);
	  fprintf (dump_file, ", offset " HOST_WIDE_INT_PRINT_DEC "\n",
		   stack_vars[j].offset);
	}
    }
}

static void
sort_stack_vars (void)
{
  size_t si, n = stack_vars_num;

  stack_vars_sorted = XNEWVEC (size_t, stack_vars_num);
  for (si = 0; si < n; ++si)
    stack_vars_sorted[si] = si;

  if (n == 1)
    return;

  qsort (stack_vars_sorted, n, sizeof (size_t), stack_var_size_cmp);
}

/* Assign rtl to DECL at frame offset OFFSET.  */

static void
expand_one_stack_var_at (tree decl, HOST_WIDE_INT offset)
{
  HOST_WIDE_INT align;
  rtx x;

  /* If this fails, we've overflowed the stack frame.  Error nicely?  */
  gcc_assert (offset == trunc_int_for_mode (offset, Pmode));

  x = plus_constant (virtual_stack_vars_rtx, offset);
  x = gen_rtx_MEM (DECL_MODE (decl), x);

  /* Set alignment we actually gave this decl.  */
  offset -= frame_phase;
  align = offset & -offset;
  align *= BITS_PER_UNIT;
  if (align > STACK_BOUNDARY || align == 0)
    align = STACK_BOUNDARY;
  DECL_ALIGN (decl) = align;
  DECL_USER_ALIGN (decl) = 0;

  set_mem_attributes (x, decl, true);
  SET_DECL_RTL (decl, x);
  if (flag_early_stack_alloc)
    {
      /* If this decl is synthesized by stack_overlay pass, copy the RTL
         to the original DECLs and remove this decl from BLOCK_VARS to
         generate proper debug info. */
      VEC(tree,gc) *orig_vars = get_original_stack_vars (decl);
      if (VEC_length(tree,orig_vars))
        {
          tree t, outer_block = DECL_INITIAL (current_function_decl);
          int ix=0;
          /* Set RTL to original variables. */
          for (ix = 0; VEC_iterate(tree,orig_vars,ix,t); ix++)
            SET_DECL_RTL (t, x);
          /* Remove decl from BLOCK_VARS. */
          t = BLOCK_VARS (outer_block);
          if (t == decl)
            BLOCK_VARS (outer_block) = TREE_CHAIN (t);
          else
            {
              for (; t ; t = TREE_CHAIN (t))
                if (TREE_CHAIN (t) == decl)
                  {
                    TREE_CHAIN (t) = TREE_CHAIN (decl);
                    break;
                  }
            }
        }
    }
}

/* A subroutine of expand_used_vars.  Give each partition representative
   a unique location within the stack frame.  Update each partition member
   with that location.  */

static void
expand_stack_vars (bool (*pred) (tree))
{
  size_t si, i, j, n = stack_vars_num;

  for (si = 0; si < n; ++si)
    {
      HOST_WIDE_INT offset;

      i = stack_vars_sorted[si];

      /* Skip variables that aren't partition representatives, for now.  */
      if (stack_vars[i].representative != i)
	continue;

      /* Skip variables that have already had rtl assigned.  See also
	 add_stack_var where we perpetrate this pc_rtx hack.  */
      if (DECL_RTL (stack_vars[i].decl) != pc_rtx)
	continue;

      /* Check the predicate to see whether this variable should be
	 allocated in this pass.  */
      if (pred && !pred (stack_vars[i].decl))
	continue;

      offset = alloc_stack_frame_space (stack_vars[i].size,
					stack_vars[i].alignb);

      /* Create rtl for each variable based on their location within the
	 partition.  */
      for (j = i; j != EOC; j = stack_vars[j].next)
	{
	  gcc_assert (stack_vars[j].offset <= stack_vars[i].size);
	  expand_one_stack_var_at (stack_vars[j].decl,
				   stack_vars[j].offset + offset);
	}
    }
}

/* Take into account all sizes of partitions and reset DECL_RTLs.  */
static HOST_WIDE_INT
account_stack_vars (void)
{
  size_t si, j, i, n = stack_vars_num;
  HOST_WIDE_INT size = 0;

  for (si = 0; si < n; ++si)
    {
      i = stack_vars_sorted[si];

      /* Skip variables that aren't partition representatives, for now.  */
      if (stack_vars[i].representative != i)
	continue;

      size += stack_vars[i].size;
      for (j = i; j != EOC; j = stack_vars[j].next)
	SET_DECL_RTL (stack_vars[j].decl, NULL);
    }
  return size;
}

/* A subroutine of expand_one_var.  Called to immediately assign rtl
   to a variable to be allocated in the stack frame.  */

static void
expand_one_stack_var (tree var)
{
  HOST_WIDE_INT size, offset, align;

  size = tree_low_cst (DECL_SIZE_UNIT (var), 1);
  align = get_decl_align_unit (var);
  offset = alloc_stack_frame_space (size, align);

  expand_one_stack_var_at (var, offset);
}

/* A subroutine of expand_one_var.  Called to assign rtl to a VAR_DECL
   that will reside in a hard register.  */

static void
expand_one_hard_reg_var (tree var)
{
  rest_of_decl_compilation (var, 0, 0);
}

/* A subroutine of expand_one_var.  Called to assign rtl to a VAR_DECL
   that will reside in a pseudo register.  */

static void
expand_one_register_var (tree var)
{
  tree type = TREE_TYPE (var);
  int unsignedp = TYPE_UNSIGNED (type);
  enum machine_mode reg_mode
    = promote_mode (type, DECL_MODE (var), &unsignedp, 0);
  rtx x = gen_reg_rtx (reg_mode);

  SET_DECL_RTL (var, x);

  /* Note if the object is a user variable.  */
  if (!DECL_ARTIFICIAL (var))
      mark_user_reg (x);

  if (POINTER_TYPE_P (type))
    mark_reg_pointer (x, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (var))));
}

/* A subroutine of expand_one_var.  Called to assign rtl to a VAR_DECL that
   has some associated error, e.g. its type is error-mark.  We just need
   to pick something that won't crash the rest of the compiler.  */

static void
expand_one_error_var (tree var)
{
  enum machine_mode mode = DECL_MODE (var);
  rtx x;

  if (mode == BLKmode)
    x = gen_rtx_MEM (BLKmode, const0_rtx);
  else if (mode == VOIDmode)
    x = const0_rtx;
  else
    x = gen_reg_rtx (mode);

  SET_DECL_RTL (var, x);
}

/* A subroutine of expand_one_var.  VAR is a variable that will be
   allocated to the local stack frame.  Return true if we wish to
   add VAR to STACK_VARS so that it will be coalesced with other
   variables.  Return false to allocate VAR immediately.

   This function is used to reduce the number of variables considered
   for coalescing, which reduces the size of the quadratic problem.  */

static bool
defer_stack_allocation (tree var, bool toplevel)
{
  /* If stack protection is enabled, *all* stack variables must be deferred,
     so that we can re-order the strings to the top of the frame.  */
  if (flag_stack_protect)
    return true;

  /* If stack protection is not required and variable coalescing happens
     in an earlier pass, no need to defer allocation.  */
  if (flag_early_stack_alloc)
    return false;

  /* Variables in the outermost scope automatically conflict with
     every other variable.  The only reason to want to defer them
     at all is that, after sorting, we can more efficiently pack
     small variables in the stack frame.  Continue to defer at -O2.  */
  if (toplevel && optimize < 2)
    return false;

  /* Without optimization, *most* variables are allocated from the
     stack, which makes the quadratic problem large exactly when we
     want compilation to proceed as quickly as possible.  On the
     other hand, we don't want the function's stack frame size to
     get completely out of hand.  So we avoid adding scalars and
     "small" aggregates to the list at all.  */
  if (optimize == 0 && tree_low_cst (DECL_SIZE_UNIT (var), 1) < 32)
    return false;

  return true;
}


/* A subroutine of expand_used_vars.  Expand one variable according to
   its flavor.  Variables to be placed on the stack are not actually
   expanded yet, merely recorded.  
   When REALLY_EXPAND is false, only add stack values to be allocated.
   Return stack usage this variable is supposed to take.
*/

static HOST_WIDE_INT
expand_one_var (tree var, bool toplevel, bool really_expand)
{
  if (SUPPORTS_STACK_ALIGNMENT
      && TREE_TYPE (var) != error_mark_node
      && TREE_CODE (var) == VAR_DECL)
    {
      unsigned int align;

      /* Because we don't know if VAR will be in register or on stack,
	 we conservatively assume it will be on stack even if VAR is
	 eventually put into register after RA pass.  For non-automatic
	 variables, which won't be on stack, we collect alignment of
	 type and ignore user specified alignment.  */
      if (TREE_STATIC (var) || DECL_EXTERNAL (var))
	align = MINIMUM_ALIGNMENT (TREE_TYPE (var),
				   TYPE_MODE (TREE_TYPE (var)),
				   TYPE_ALIGN (TREE_TYPE (var)));
      else
	align = MINIMUM_ALIGNMENT (var, DECL_MODE (var), DECL_ALIGN (var));

      if (crtl->stack_alignment_estimated < align)
        {
          /* stack_alignment_estimated shouldn't change after stack
             realign decision made */
          gcc_assert(!crtl->stack_realign_processed);
	  crtl->stack_alignment_estimated = align;
	}
    }

  if (TREE_CODE (var) != VAR_DECL)
    ;
  else if (DECL_EXTERNAL (var))
    ;
  else if (DECL_HAS_VALUE_EXPR_P (var))
    ;
  else if (TREE_STATIC (var))
    ;
  else if (DECL_RTL_SET_P (var))
    ;
  else if (TREE_TYPE (var) == error_mark_node)
    {
      if (really_expand)
        expand_one_error_var (var);
    }
  else if (DECL_HARD_REGISTER (var))
    {
      if (really_expand)
        expand_one_hard_reg_var (var);
    }
  else if (use_register_for_decl (var))
    {
      if (really_expand)
        expand_one_register_var (var);
    }
  else if (!host_integerp (DECL_SIZE_UNIT (var), 1))
    {
      if (really_expand)
	{
	  error ("size of variable %q+D is too large", var);
	  expand_one_error_var (var);
	}
    }
  else if (defer_stack_allocation (var, toplevel))
    add_stack_var (var);
  else
    {
      if (really_expand)
        expand_one_stack_var (var);
      return tree_low_cst (DECL_SIZE_UNIT (var), 1);
    }
  return 0;
}

/* A subroutine of expand_used_vars.  Walk down through the BLOCK tree
   expanding variables.  Those variables that can be put into registers
   are allocated pseudos; those that can't are put on the stack.

   TOPLEVEL is true if this is the outermost BLOCK.  */

static void
expand_used_vars_for_block (tree block, bool toplevel)
{
  size_t i, j, old_sv_num, this_sv_num, new_sv_num;
  tree t;

  old_sv_num = toplevel ? 0 : stack_vars_num;

  /* Expand all variables at this level.  */
  for (t = BLOCK_VARS (block); t ; t = TREE_CHAIN (t))
    if (TREE_USED (t))
      expand_one_var (t, toplevel, true);

  this_sv_num = stack_vars_num;

  /* Expand all variables at containing levels.  */
  for (t = BLOCK_SUBBLOCKS (block); t ; t = BLOCK_CHAIN (t))
    expand_used_vars_for_block (t, false);

  /* Since we do not track exact variable lifetimes (which is not even
     possible for variables whose address escapes), we mirror the block
     tree in the interference graph.  Here we cause all variables at this
     level, and all sublevels, to conflict.  Do make certain that a
     variable conflicts with itself.  */
  if (old_sv_num < this_sv_num)
    {
      new_sv_num = stack_vars_num;
      resize_stack_vars_conflict (new_sv_num);

      for (i = old_sv_num; i < new_sv_num; ++i)
	for (j = i < this_sv_num ? i+1 : this_sv_num; j-- > old_sv_num ;)
	  add_stack_var_conflict (i, j);
    }
}

/* A subroutine of expand_used_vars.  Walk down through the BLOCK tree
   and clear TREE_USED on all local variables.  */

static void
clear_tree_used (tree block)
{
  tree t;

  for (t = BLOCK_VARS (block); t ; t = TREE_CHAIN (t))
    /* if (!TREE_STATIC (t) && !DECL_EXTERNAL (t)) */
      TREE_USED (t) = 0;

  for (t = BLOCK_SUBBLOCKS (block); t ; t = BLOCK_CHAIN (t))
    clear_tree_used (t);
}

/* Examine TYPE and determine a bit mask of the following features.  */

#define SPCT_HAS_LARGE_CHAR_ARRAY	1
#define SPCT_HAS_SMALL_CHAR_ARRAY	2
#define SPCT_HAS_ARRAY			4
#define SPCT_HAS_AGGREGATE		8

static unsigned int
stack_protect_classify_type (tree type)
{
  unsigned int ret = 0;
  tree t;

  switch (TREE_CODE (type))
    {
    case ARRAY_TYPE:
      t = TYPE_MAIN_VARIANT (TREE_TYPE (type));
      if (t == char_type_node
	  || t == signed_char_type_node
	  || t == unsigned_char_type_node)
	{
	  unsigned HOST_WIDE_INT max = PARAM_VALUE (PARAM_SSP_BUFFER_SIZE);
	  unsigned HOST_WIDE_INT len;

	  if (!TYPE_SIZE_UNIT (type)
	      || !host_integerp (TYPE_SIZE_UNIT (type), 1))
	    len = max;
	  else
	    len = tree_low_cst (TYPE_SIZE_UNIT (type), 1);

	  if (len < max)
	    ret = SPCT_HAS_SMALL_CHAR_ARRAY | SPCT_HAS_ARRAY;
	  else
	    ret = SPCT_HAS_LARGE_CHAR_ARRAY | SPCT_HAS_ARRAY;
	}
      else
	ret = SPCT_HAS_ARRAY;
      break;

    case UNION_TYPE:
    case QUAL_UNION_TYPE:
    case RECORD_TYPE:
      ret = SPCT_HAS_AGGREGATE;
      for (t = TYPE_FIELDS (type); t ; t = TREE_CHAIN (t))
	if (TREE_CODE (t) == FIELD_DECL)
	  ret |= stack_protect_classify_type (TREE_TYPE (t));
      break;

    default:
      break;
    }

  return ret;
}

/* Return nonzero if DECL should be segregated into the "vulnerable" upper
   part of the local stack frame.  Remember if we ever return nonzero for
   any variable in this function.  The return value is the phase number in
   which the variable should be allocated.  */

static int
stack_protect_decl_phase (tree decl)
{
  unsigned int bits = stack_protect_classify_type (TREE_TYPE (decl));
  int ret = 0;

  if (bits & SPCT_HAS_SMALL_CHAR_ARRAY)
    has_short_buffer = true;

  if (flag_stack_protect == 2)
    {
      if ((bits & (SPCT_HAS_SMALL_CHAR_ARRAY | SPCT_HAS_LARGE_CHAR_ARRAY))
	  && !(bits & SPCT_HAS_AGGREGATE))
	ret = 1;
      else if (bits & SPCT_HAS_ARRAY)
	ret = 2;
    }
  else
    ret = (bits & SPCT_HAS_LARGE_CHAR_ARRAY) != 0;

  if (!flag_early_stack_alloc && ret)
    has_protected_decls = true;

  return ret;
}

static bool
need_stack_protection (void)
{
  size_t i, n = stack_vars_num;

  if (!flag_stack_protect)
    return false;
  for (i = 0; i < n; ++i)
    if (stack_protect_decl_phase (stack_vars[i].decl))
      return true;
  return false;
}

/* Two helper routines that check for phase 1 and phase 2.  These are used
   as callbacks for expand_stack_vars.  */

static bool
stack_protect_decl_phase_1 (tree decl)
{
  return stack_protect_decl_phase (decl) == 1;
}

static bool
stack_protect_decl_phase_2 (tree decl)
{
  return stack_protect_decl_phase (decl) == 2;
}

/* Ensure that variables in different stack protection phases conflict
   so that they are not merged and share the same stack slot.  */

static void
add_stack_protection_conflicts (void)
{
  size_t i, j, n = stack_vars_num;
  unsigned char *phase;

  phase = XNEWVEC (unsigned char, n);
  for (i = 0; i < n; ++i)
    phase[i] = stack_protect_decl_phase (stack_vars[i].decl);

  for (i = 0; i < n; ++i)
    {
      unsigned char ph_i = phase[i];
      for (j = 0; j < i; ++j)
	if (ph_i != phase[j])
	  add_stack_var_conflict (i, j);
    }

  XDELETEVEC (phase);
}

/* Create a decl for the guard at the top of the stack frame.  */

static void
create_stack_guard (void)
{
  tree guard = build_decl (VAR_DECL, NULL, ptr_type_node);
  TREE_THIS_VOLATILE (guard) = 1;
  TREE_USED (guard) = 1;
  expand_one_stack_var (guard);
  crtl->stack_protect_guard = guard;
}

/* A subroutine of expand_used_vars.  Walk down through the BLOCK tree
   expanding variables.  Those variables that can be put into registers
   are allocated pseudos; those that can't are put on the stack.

   TOPLEVEL is true if this is the outermost BLOCK.  */

static HOST_WIDE_INT
account_used_vars_for_block (tree block, bool toplevel)
{
  size_t i, j, old_sv_num, this_sv_num, new_sv_num;
  tree t;
  HOST_WIDE_INT size = 0;

  old_sv_num = toplevel ? 0 : stack_vars_num;

  /* Expand all variables at this level.  */
  for (t = BLOCK_VARS (block); t ; t = TREE_CHAIN (t))
    if (TREE_USED (t))
      size += expand_one_var (t, toplevel, false);

  this_sv_num = stack_vars_num;

  /* Expand all variables at containing levels.  */
  for (t = BLOCK_SUBBLOCKS (block); t ; t = BLOCK_CHAIN (t))
    size += account_used_vars_for_block (t, false);

  /* Since we do not track exact variable lifetimes (which is not even
     possible for variables whose address escapes), we mirror the block
     tree in the interference graph.  Here we cause all variables at this
     level, and all sublevels, to conflict.  Do make certain that a
     variable conflicts with itself.  */
  if (old_sv_num < this_sv_num)
    {
      new_sv_num = stack_vars_num;
      resize_stack_vars_conflict (new_sv_num);

      for (i = old_sv_num; i < new_sv_num; ++i)
	for (j = i < this_sv_num ? i+1 : this_sv_num; j-- > old_sv_num ;)
	  add_stack_var_conflict (i, j);
    }
  return size;
}

/* Prepare for expanding variables.  */
static void 
init_vars_expansion (void)
{
  tree t;
  /* Set TREE_USED on all variables in the local_decls.  */
  for (t = cfun->local_decls; t; t = TREE_CHAIN (t))
    TREE_USED (TREE_VALUE (t)) = 1;

  /* Clear TREE_USED on all variables associated with a block scope.  */
  clear_tree_used (DECL_INITIAL (current_function_decl));

  /* Initialize local stack smashing state.  */
  has_protected_decls = false;
  has_short_buffer = false;
}

/* Free up stack variable graph data.  */
static void
fini_vars_expansion (void)
{
  XDELETEVEC (stack_vars);
  XDELETEVEC (stack_vars_sorted);
  XDELETEVEC (stack_vars_conflict);
  stack_vars = NULL;
  stack_vars_alloc = stack_vars_num = 0;
  stack_vars_conflict = NULL;
  stack_vars_conflict_alloc = 0;
}

/* Make a fair guess for the size of the stack frame of the current
   function.  This doesn't have to be exact, the result is only used
   in the inline heuristics.  So we don't want to run the full stack
   var packing algorithm (which is quadratic in the number of stack
   vars).  Instead, we calculate the total size of all stack vars.
   This turns out to be a pretty fair estimate -- packing of stack
   vars doesn't happen very often.  */

HOST_WIDE_INT
estimated_stack_frame_size (void)
{
  HOST_WIDE_INT size = 0;
  size_t i;
  tree t, outer_block = DECL_INITIAL (current_function_decl);

  init_vars_expansion ();

  for (t = cfun->local_decls; t; t = TREE_CHAIN (t))
    {
      tree var = TREE_VALUE (t);

      if (TREE_USED (var))
        size += expand_one_var (var, true, false);
      TREE_USED (var) = 1;
    }
  size += account_used_vars_for_block (outer_block, true);

  if (stack_vars_num > 0)
    {
      /* Fake sorting the stack vars for account_stack_vars ().  */
      stack_vars_sorted = XNEWVEC (size_t, stack_vars_num);
      for (i = 0; i < stack_vars_num; ++i)
	stack_vars_sorted[i] = i;
      size += account_stack_vars ();
      fini_vars_expansion ();
    }

  return size;
}

/* Expand all variables used in the function.  */

static void
expand_used_vars (void)
{
  tree t, next, outer_block = DECL_INITIAL (current_function_decl);

  /* Compute the phase of the stack frame for this function.  */
  {
    int align = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
    int off = STARTING_FRAME_OFFSET % align;
    frame_phase = off ? align - off : 0;
  }

  init_vars_expansion ();

  /* At this point all variables on the local_decls with TREE_USED
     set are not associated with any block scope.  Lay them out.  */
  t = cfun->local_decls;
  cfun->local_decls = NULL_TREE;
  for (; t; t = next)
    {
      tree var = TREE_VALUE (t);
      bool expand_now = flag_early_stack_alloc;

      next = TREE_CHAIN (t);
      if (!flag_early_stack_alloc)
        {
          /* We didn't set a block for static or extern because it's hard
             to tell the difference between a global variable (re)declared
             in a local scope, and one that's really declared there to
             begin with.  And it doesn't really matter much, since we're
             not giving them stack space.  Expand them now.  */
          if (TREE_STATIC (var) || DECL_EXTERNAL (var))
            expand_now = true;

          /* Any variable that could have been hoisted into an SSA_NAME
             will have been propagated anywhere the optimizers chose,
             i.e. not confined to their original block.  Allocate them
             as if they were defined in the outermost scope.  */
          else if (is_gimple_reg (var))
            expand_now = true;

          /* If the variable is not associated with any block, then it
             was created by the optimizers, and could be live anywhere
             in the function.  */
          else if (TREE_USED (var))
            expand_now = true;

          /* Finally, mark all variables on the list as used.  We'll use
             this in a moment when we expand those associated with scopes.  */
          TREE_USED (var) = 1;

        }
      if (expand_now)
	{
	  expand_one_var (var, true, true);
	  if (DECL_ARTIFICIAL (var) && !DECL_IGNORED_P (var))
	    {
	      rtx rtl = DECL_RTL_IF_SET (var);

	      /* Keep artificial non-ignored vars in cfun->local_decls
		 chain until instantiate_decls.  */
	      if (rtl && (MEM_P (rtl) || GET_CODE (rtl) == CONCAT))
		{
		  TREE_CHAIN (t) = cfun->local_decls;
		  cfun->local_decls = t;
		  continue;
		}
	    }
	}

      ggc_free (t);
    }

  if (flag_early_stack_alloc)
    has_protected_decls = need_stack_protection ();
  else
    /* At this point, all variables within the block tree with TREE_USED
       set are actually used by the optimized function.  Lay them out.  */
    expand_used_vars_for_block (outer_block, true);

  if (!flag_early_stack_alloc && stack_vars_num > 0)
    {
      /* Due to the way alias sets work, no variables with non-conflicting
	 alias sets may be assigned the same address.  Add conflicts to
	 reflect this.  */
      add_alias_set_conflicts ();

      /* If stack protection is enabled, we don't share space between
	 vulnerable data and non-vulnerable data.  */
      if (flag_stack_protect)
	add_stack_protection_conflicts ();

      /* Now that we have collected all stack variables, and have computed a
	 minimal interference graph, attempt to save some stack space.  */
      partition_stack_vars ();
      if (dump_file)
	dump_stack_var_partition ();
    }

  /* There are several conditions under which we should create a
     stack guard: protect-all, alloca used, protected decls present.  */
  if (flag_stack_protect == 2
      || (flag_stack_protect
	  && (cfun->calls_alloca || has_protected_decls)))
    create_stack_guard ();

  /* Assign rtl to each variable based on these partitions.  */
  if (stack_vars_num > 0)
    {
      if (flag_early_stack_alloc)
        sort_stack_vars ();
      /* Reorder decls to be protected by iterating over the variables
	 array multiple times, and allocating out of each phase in turn.  */
      /* ??? We could probably integrate this into the qsort we did
	 earlier, such that we naturally see these variables first,
	 and thus naturally allocate things in the right order.  */
      if (has_protected_decls)
	{
	  /* Phase 1 contains only character arrays.  */
	  expand_stack_vars (stack_protect_decl_phase_1);

	  /* Phase 2 contains other kinds of arrays.  */
	  if (flag_stack_protect == 2)
	    expand_stack_vars (stack_protect_decl_phase_2);
	}

      expand_stack_vars (NULL);

      fini_vars_expansion ();
    }

  /* If the target requires that FRAME_OFFSET be aligned, do it.  */
  if (STACK_ALIGNMENT_NEEDED)
    {
      HOST_WIDE_INT align = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
      if (!FRAME_GROWS_DOWNWARD)
	frame_offset += align - 1;
      frame_offset &= -align;
    }
}


/* If we need to produce a detailed dump, print the tree representation
   for STMT to the dump file.  SINCE is the last RTX after which the RTL
   generated for STMT should have been appended.  */

static void
maybe_dump_rtl_for_gimple_stmt (gimple stmt, rtx since)
{
  if (dump_file && (dump_flags & TDF_DETAILS))
    {
      fprintf (dump_file, "\n;; ");
      print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM);
      fprintf (dump_file, "\n");

      print_rtl (dump_file, since ? NEXT_INSN (since) : since);
    }
}

/* Maps the blocks that do not contain tree labels to rtx labels.  */

static struct pointer_map_t *lab_rtx_for_bb;

/* Returns the label_rtx expression for a label starting basic block BB.  */

static rtx
label_rtx_for_bb (basic_block bb ATTRIBUTE_UNUSED)
{
  gimple_stmt_iterator gsi;
  tree lab;
  gimple lab_stmt;
  void **elt;

  if (bb->flags & BB_RTL)
    return block_label (bb);

  elt = pointer_map_contains (lab_rtx_for_bb, bb);
  if (elt)
    return (rtx) *elt;

  /* Find the tree label if it is present.  */
     
  for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
    {
      lab_stmt = gsi_stmt (gsi);
      if (gimple_code (lab_stmt) != GIMPLE_LABEL)
	break;

      lab = gimple_label_label (lab_stmt);
      if (DECL_NONLOCAL (lab))
	break;

      return label_rtx (lab);
    }

  elt = pointer_map_insert (lab_rtx_for_bb, bb);
  *elt = gen_label_rtx ();
  return (rtx) *elt;
}


/* A subroutine of expand_gimple_basic_block.  Expand one GIMPLE_COND.
   Returns a new basic block if we've terminated the current basic
   block and created a new one.  */

static basic_block
expand_gimple_cond (basic_block bb, gimple stmt)
{
  basic_block new_bb, dest;
  edge new_edge;
  edge true_edge;
  edge false_edge;
  tree pred = gimple_cond_pred_to_tree (stmt);
  rtx last2, last;

  last2 = last = get_last_insn ();

  extract_true_false_edges_from_block (bb, &true_edge, &false_edge);
  if (gimple_has_location (stmt))
    {
      set_curr_insn_source_location (gimple_location (stmt));
      set_curr_insn_block (gimple_block (stmt));
    }

  /* These flags have no purpose in RTL land.  */
  true_edge->flags &= ~EDGE_TRUE_VALUE;
  false_edge->flags &= ~EDGE_FALSE_VALUE;

  /* We can either have a pure conditional jump with one fallthru edge or
     two-way jump that needs to be decomposed into two basic blocks.  */
  if (false_edge->dest == bb->next_bb)
    {
      jumpif (pred, label_rtx_for_bb (true_edge->dest));
      add_reg_br_prob_note (last, true_edge->probability);
      maybe_dump_rtl_for_gimple_stmt (stmt, last);
      if (true_edge->goto_locus)
	{
	  set_curr_insn_source_location (true_edge->goto_locus);
	  set_curr_insn_block (true_edge->goto_block);
	  true_edge->goto_locus = curr_insn_locator ();
	}
      true_edge->goto_block = NULL;
      false_edge->flags |= EDGE_FALLTHRU;
      ggc_free (pred);
      return NULL;
    }
  if (true_edge->dest == bb->next_bb)
    {
      jumpifnot (pred, label_rtx_for_bb (false_edge->dest));
      add_reg_br_prob_note (last, false_edge->probability);
      maybe_dump_rtl_for_gimple_stmt (stmt, last);
      if (false_edge->goto_locus)
	{
	  set_curr_insn_source_location (false_edge->goto_locus);
	  set_curr_insn_block (false_edge->goto_block);
	  false_edge->goto_locus = curr_insn_locator ();
	}
      false_edge->goto_block = NULL;
      true_edge->flags |= EDGE_FALLTHRU;
      ggc_free (pred);
      return NULL;
    }

  jumpif (pred, label_rtx_for_bb (true_edge->dest));
  add_reg_br_prob_note (last, true_edge->probability);
  last = get_last_insn ();
  if (false_edge->goto_locus)
    {
      set_curr_insn_source_location (false_edge->goto_locus);
      set_curr_insn_block (false_edge->goto_block);
      false_edge->goto_locus = curr_insn_locator ();
    }
  false_edge->goto_block = NULL;
  emit_jump (label_rtx_for_bb (false_edge->dest));

  BB_END (bb) = last;
  if (BARRIER_P (BB_END (bb)))
    BB_END (bb) = PREV_INSN (BB_END (bb));
  update_bb_for_insn (bb);

  new_bb = create_basic_block (NEXT_INSN (last), get_last_insn (), bb);
  dest = false_edge->dest;
  redirect_edge_succ (false_edge, new_bb);
  false_edge->flags |= EDGE_FALLTHRU;
  new_bb->count = false_edge->count;
  new_bb->frequency = EDGE_FREQUENCY (false_edge);
  new_edge = make_edge (new_bb, dest, 0);
  new_edge->probability = REG_BR_PROB_BASE;
  new_edge->count = new_bb->count;
  if (BARRIER_P (BB_END (new_bb)))
    BB_END (new_bb) = PREV_INSN (BB_END (new_bb));
  update_bb_for_insn (new_bb);

  maybe_dump_rtl_for_gimple_stmt (stmt, last2);

  if (true_edge->goto_locus)
    {
      set_curr_insn_source_location (true_edge->goto_locus);
      set_curr_insn_block (true_edge->goto_block);
      true_edge->goto_locus = curr_insn_locator ();
    }
  true_edge->goto_block = NULL;

  ggc_free (pred);
  return new_bb;
}

/* A subroutine of expand_gimple_basic_block.  Expand one GIMPLE_CALL
   that has CALL_EXPR_TAILCALL set.  Returns non-null if we actually
   generated a tail call (something that might be denied by the ABI
   rules governing the call; see calls.c).

   Sets CAN_FALLTHRU if we generated a *conditional* tail call, and
   can still reach the rest of BB.  The case here is __builtin_sqrt,
   where the NaN result goes through the external function (with a
   tailcall) and the normal result happens via a sqrt instruction.  */

static basic_block
expand_gimple_tailcall (basic_block bb, gimple stmt, bool *can_fallthru)
{
  rtx last2, last;
  edge e;
  edge_iterator ei;
  int probability;
  gcov_type count;
  tree stmt_tree = gimple_to_tree (stmt);

  last2 = last = get_last_insn ();

  expand_expr_stmt (stmt_tree);

  release_stmt_tree (stmt, stmt_tree);

  for (last = NEXT_INSN (last); last; last = NEXT_INSN (last))
    if (CALL_P (last) && SIBLING_CALL_P (last))
      goto found;

  maybe_dump_rtl_for_gimple_stmt (stmt, last2);

  *can_fallthru = true;
  return NULL;

 found:
  /* ??? Wouldn't it be better to just reset any pending stack adjust?
     Any instructions emitted here are about to be deleted.  */
  do_pending_stack_adjust ();

  /* Remove any non-eh, non-abnormal edges that don't go to exit.  */
  /* ??? I.e. the fallthrough edge.  HOWEVER!  If there were to be
     EH or abnormal edges, we shouldn't have created a tail call in
     the first place.  So it seems to me we should just be removing
     all edges here, or redirecting the existing fallthru edge to
     the exit block.  */

  probability = 0;
  count = 0;

  for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
    {
      if (!(e->flags & (EDGE_ABNORMAL | EDGE_EH)))
	{
	  if (e->dest != EXIT_BLOCK_PTR)
	    {
	      e->dest->count -= e->count;
	      e->dest->frequency -= EDGE_FREQUENCY (e);
	      if (e->dest->count < 0)
		e->dest->count = 0;
	      if (e->dest->frequency < 0)
		e->dest->frequency = 0;
	    }
	  count += e->count;
	  probability += e->probability;
	  remove_edge (e);
	}
      else
	ei_next (&ei);
    }

  /* This is somewhat ugly: the call_expr expander often emits instructions
     after the sibcall (to perform the function return).  These confuse the
     find_many_sub_basic_blocks code, so we need to get rid of these.  */
  last = NEXT_INSN (last);
  gcc_assert (BARRIER_P (last));

  *can_fallthru = false;
  while (NEXT_INSN (last))
    {
      /* For instance an sqrt builtin expander expands if with
	 sibcall in the then and label for `else`.  */
      if (LABEL_P (NEXT_INSN (last)))
	{
	  *can_fallthru = true;
	  break;
	}
      delete_insn (NEXT_INSN (last));
    }

  e = make_edge (bb, EXIT_BLOCK_PTR, EDGE_ABNORMAL | EDGE_SIBCALL);
  e->probability += probability;
  e->count += count;
  BB_END (bb) = last;
  update_bb_for_insn (bb);

  if (NEXT_INSN (last))
    {
      bb = create_basic_block (NEXT_INSN (last), get_last_insn (), bb);

      last = BB_END (bb);
      if (BARRIER_P (last))
	BB_END (bb) = PREV_INSN (last);
    }

  maybe_dump_rtl_for_gimple_stmt (stmt, last2);

  return bb;
}

/* Expand basic block BB from GIMPLE trees to RTL.  */

static basic_block
expand_gimple_basic_block (basic_block bb)
{
  gimple_stmt_iterator gsi;
  gimple_seq stmts;
  gimple stmt = NULL;
  rtx note, last;
  edge e;
  edge_iterator ei;
  void **elt;

  if (dump_file)
    fprintf (dump_file, "\n;; Generating RTL for gimple basic block %d\n",
	     bb->index);

  /* Note that since we are now transitioning from GIMPLE to RTL, we
     cannot use the gsi_*_bb() routines because they expect the basic
     block to be in GIMPLE, instead of RTL.  Therefore, we need to
     access the BB sequence directly.  */
  stmts = bb_seq (bb);
  bb->il.gimple = NULL;
  rtl_profile_for_bb (bb);
  init_rtl_bb_info (bb);
  bb->flags |= BB_RTL;

  /* Remove the RETURN_EXPR if we may fall though to the exit
     instead.  */
  gsi = gsi_last (stmts);
  if (!gsi_end_p (gsi)
      && gimple_code (gsi_stmt (gsi)) == GIMPLE_RETURN)
    {
      gimple ret_stmt = gsi_stmt (gsi);

      gcc_assert (single_succ_p (bb));
      gcc_assert (single_succ (bb) == EXIT_BLOCK_PTR);

      if (bb->next_bb == EXIT_BLOCK_PTR
	  && !gimple_return_retval (ret_stmt))
	{
	  gsi_remove (&gsi, false);
	  single_succ_edge (bb)->flags |= EDGE_FALLTHRU;
	}
    }

  gsi = gsi_start (stmts);
  if (!gsi_end_p (gsi))
    {
      stmt = gsi_stmt (gsi);
      if (gimple_code (stmt) != GIMPLE_LABEL)
	stmt = NULL;
    }

  elt = pointer_map_contains (lab_rtx_for_bb, bb);

  if (stmt || elt)
    {
      last = get_last_insn ();

      if (stmt)
	{
	  tree stmt_tree = gimple_to_tree (stmt);
	  expand_expr_stmt (stmt_tree);
	  release_stmt_tree (stmt, stmt_tree);
	  gsi_next (&gsi);
	}

      if (elt)
	emit_label ((rtx) *elt);

      /* Java emits line number notes in the top of labels.
	 ??? Make this go away once line number notes are obsoleted.  */
      BB_HEAD (bb) = NEXT_INSN (last);
      if (NOTE_P (BB_HEAD (bb)))
	BB_HEAD (bb) = NEXT_INSN (BB_HEAD (bb));
      note = emit_note_after (NOTE_INSN_BASIC_BLOCK, BB_HEAD (bb));

      maybe_dump_rtl_for_gimple_stmt (stmt, last);
    }
  else
    note = BB_HEAD (bb) = emit_note (NOTE_INSN_BASIC_BLOCK);

  NOTE_BASIC_BLOCK (note) = bb;

  for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
    {
      /* Clear EDGE_EXECUTABLE.  This flag is never used in the backend.  */
      e->flags &= ~EDGE_EXECUTABLE;

      /* At the moment not all abnormal edges match the RTL representation.
	 It is safe to remove them here as find_many_sub_basic_blocks will
	 rediscover them.  In the future we should get this fixed properly.  */
      if (e->flags & EDGE_ABNORMAL)
	remove_edge (e);
      else
	ei_next (&ei);
    }

  for (; !gsi_end_p (gsi); gsi_next (&gsi))
    {
      gimple stmt = gsi_stmt (gsi);
      basic_block new_bb;

      /* Expand this statement, then evaluate the resulting RTL and
	 fixup the CFG accordingly.  */
      if (gimple_code (stmt) == GIMPLE_COND)
	{
	  new_bb = expand_gimple_cond (bb, stmt);
	  if (new_bb)
	    return new_bb;
	}
      else
	{
	  if (is_gimple_call (stmt) && gimple_call_tail_p (stmt))
	    {
	      bool can_fallthru;
	      new_bb = expand_gimple_tailcall (bb, stmt, &can_fallthru);
	      if (new_bb)
		{
		  if (can_fallthru)
		    bb = new_bb;
		  else
		    return new_bb;
		}
	    }
	  else if (gimple_code (stmt) != GIMPLE_CHANGE_DYNAMIC_TYPE)
	    {
	      tree stmt_tree = gimple_to_tree (stmt);
	      last = get_last_insn ();
	      expand_expr_stmt (stmt_tree);
	      maybe_dump_rtl_for_gimple_stmt (stmt, last);
	      release_stmt_tree (stmt, stmt_tree);
	    }
	}
    }

  /* Expand implicit goto and convert goto_locus.  */
  FOR_EACH_EDGE (e, ei, bb->succs)
    {
      if (e->goto_locus && e->goto_block)
	{
	  set_curr_insn_source_location (e->goto_locus);
	  set_curr_insn_block (e->goto_block);
	  e->goto_locus = curr_insn_locator ();
	}
      e->goto_block = NULL;
      if ((e->flags & EDGE_FALLTHRU) && e->dest != bb->next_bb)
	{
	  emit_jump (label_rtx_for_bb (e->dest));
	  e->flags &= ~EDGE_FALLTHRU;
	}
    }

  do_pending_stack_adjust ();

  /* Find the block tail.  The last insn in the block is the insn
     before a barrier and/or table jump insn.  */
  last = get_last_insn ();
  if (BARRIER_P (last))
    last = PREV_INSN (last);
  if (JUMP_TABLE_DATA_P (last))
    last = PREV_INSN (PREV_INSN (last));
  BB_END (bb) = last;

  update_bb_for_insn (bb);

  return bb;
}


/* Create a basic block for initialization code.  */

static basic_block
construct_init_block (void)
{
  basic_block init_block, first_block;
  edge e = NULL;
  int flags;

  /* Multiple entry points not supported yet.  */
  gcc_assert (EDGE_COUNT (ENTRY_BLOCK_PTR->succs) == 1);
  init_rtl_bb_info (ENTRY_BLOCK_PTR);
  init_rtl_bb_info (EXIT_BLOCK_PTR);
  ENTRY_BLOCK_PTR->flags |= BB_RTL;
  EXIT_BLOCK_PTR->flags |= BB_RTL;

  e = EDGE_SUCC (ENTRY_BLOCK_PTR, 0);

  /* When entry edge points to first basic block, we don't need jump,
     otherwise we have to jump into proper target.  */
  if (e && e->dest != ENTRY_BLOCK_PTR->next_bb)
    {
      tree label = gimple_block_label (e->dest);

      emit_jump (label_rtx (label));
      flags = 0;
    }
  else
    flags = EDGE_FALLTHRU;

  init_block = create_basic_block (NEXT_INSN (get_insns ()),
				   get_last_insn (),
				   ENTRY_BLOCK_PTR);
  init_block->frequency = ENTRY_BLOCK_PTR->frequency;
  init_block->count = ENTRY_BLOCK_PTR->count;
  if (e)
    {
      first_block = e->dest;
      redirect_edge_succ (e, init_block);
      e = make_edge (init_block, first_block, flags);
    }
  else
    e = make_edge (init_block, EXIT_BLOCK_PTR, EDGE_FALLTHRU);
  e->probability = REG_BR_PROB_BASE;
  e->count = ENTRY_BLOCK_PTR->count;

  update_bb_for_insn (init_block);
  return init_block;
}

/* For each lexical block, set BLOCK_NUMBER to the depth at which it is
   found in the block tree.  */

static void
set_block_levels (tree block, int level)
{
  while (block)
    {
      BLOCK_NUMBER (block) = level;
      set_block_levels (BLOCK_SUBBLOCKS (block), level + 1);
      block = BLOCK_CHAIN (block);
    }
}

/* Create a block containing landing pads and similar stuff.  */

static void
construct_exit_block (void)
{
  rtx head = get_last_insn ();
  rtx end;
  basic_block exit_block;
  edge e, e2;
  unsigned ix;
  edge_iterator ei;
  rtx orig_end = BB_END (EXIT_BLOCK_PTR->prev_bb);

  rtl_profile_for_bb (EXIT_BLOCK_PTR);

  /* Make sure the locus is set to the end of the function, so that
     epilogue line numbers and warnings are set properly.  */
  if (cfun->function_end_locus != UNKNOWN_LOCATION)
    input_location = cfun->function_end_locus;

  /* The following insns belong to the top scope.  */
  set_curr_insn_block (DECL_INITIAL (current_function_decl));

  /* Generate rtl for function exit.  */
  expand_function_end ();

  end = get_last_insn ();
  if (head == end)
    return;
  /* While emitting the function end we could move end of the last basic block.
   */
  BB_END (EXIT_BLOCK_PTR->prev_bb) = orig_end;
  while (NEXT_INSN (head) && NOTE_P (NEXT_INSN (head)))
    head = NEXT_INSN (head);
  exit_block = create_basic_block (NEXT_INSN (head), end,
				   EXIT_BLOCK_PTR->prev_bb);
  exit_block->frequency = EXIT_BLOCK_PTR->frequency;
  exit_block->count = EXIT_BLOCK_PTR->count;

  ix = 0;
  while (ix < EDGE_COUNT (EXIT_BLOCK_PTR->preds))
    {
      e = EDGE_PRED (EXIT_BLOCK_PTR, ix);
      if (!(e->flags & EDGE_ABNORMAL))
	redirect_edge_succ (e, exit_block);
      else
	ix++;
    }

  e = make_edge (exit_block, EXIT_BLOCK_PTR, EDGE_FALLTHRU);
  e->probability = REG_BR_PROB_BASE;
  e->count = EXIT_BLOCK_PTR->count;
  FOR_EACH_EDGE (e2, ei, EXIT_BLOCK_PTR->preds)
    if (e2 != e)
      {
	e->count -= e2->count;
	exit_block->count -= e2->count;
	exit_block->frequency -= EDGE_FREQUENCY (e2);
      }
  if (e->count < 0)
    e->count = 0;
  if (exit_block->count < 0)
    exit_block->count = 0;
  if (exit_block->frequency < 0)
    exit_block->frequency = 0;
  update_bb_for_insn (exit_block);
}

/* Helper function for discover_nonconstant_array_refs.
   Look for ARRAY_REF nodes with non-constant indexes and mark them
   addressable.  */

static tree
discover_nonconstant_array_refs_r (tree * tp, int *walk_subtrees,
				   void *data ATTRIBUTE_UNUSED)
{
  tree t = *tp;

  if (IS_TYPE_OR_DECL_P (t))
    *walk_subtrees = 0;
  else if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
    {
      while (((TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
	      && is_gimple_min_invariant (TREE_OPERAND (t, 1))
	      && (!TREE_OPERAND (t, 2)
		  || is_gimple_min_invariant (TREE_OPERAND (t, 2))))
	     || (TREE_CODE (t) == COMPONENT_REF
		 && (!TREE_OPERAND (t,2)
		     || is_gimple_min_invariant (TREE_OPERAND (t, 2))))
	     || TREE_CODE (t) == BIT_FIELD_REF
	     || TREE_CODE (t) == REALPART_EXPR
	     || TREE_CODE (t) == IMAGPART_EXPR
	     || TREE_CODE (t) == VIEW_CONVERT_EXPR
	     || CONVERT_EXPR_P (t))
	t = TREE_OPERAND (t, 0);

      if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
	{
	  t = get_base_address (t);
	  if (t && DECL_P (t))
	    TREE_ADDRESSABLE (t) = 1;
	}

      *walk_subtrees = 0;
    }

  return NULL_TREE;
}

/* RTL expansion is not able to compile array references with variable
   offsets for arrays stored in single register.  Discover such
   expressions and mark variables as addressable to avoid this
   scenario.  */

static void
discover_nonconstant_array_refs (void)
{
  basic_block bb;
  gimple_stmt_iterator gsi;

  FOR_EACH_BB (bb)
    for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
      {
	gimple stmt = gsi_stmt (gsi);
	walk_gimple_op (stmt, discover_nonconstant_array_refs_r, NULL);
      }
}

/* This function sets crtl->args.internal_arg_pointer to a virtual
   register if DRAP is needed.  Local register allocator will replace
   virtual_incoming_args_rtx with the virtual register.  */

static void
expand_stack_alignment (void)
{
  rtx drap_rtx;
  unsigned int preferred_stack_boundary;

  if (! SUPPORTS_STACK_ALIGNMENT)
    return;
  
  if (cfun->calls_alloca
      || cfun->has_nonlocal_label
      || crtl->has_nonlocal_goto)
    crtl->need_drap = true;

  /* Call update_stack_boundary here again to update incoming stack
     boundary.  It may set incoming stack alignment to a different
     value after RTL expansion.  TARGET_FUNCTION_OK_FOR_SIBCALL may
     use the minimum incoming stack alignment to check if it is OK
     to perform sibcall optimization since sibcall optimization will
     only align the outgoing stack to incoming stack boundary.  */
  if (targetm.calls.update_stack_boundary)
    targetm.calls.update_stack_boundary ();

  /* The incoming stack frame has to be aligned at least at
     parm_stack_boundary.  */
  gcc_assert (crtl->parm_stack_boundary <= INCOMING_STACK_BOUNDARY);

  /* Update crtl->stack_alignment_estimated and use it later to align
     stack.  We check PREFERRED_STACK_BOUNDARY if there may be non-call
     exceptions since callgraph doesn't collect incoming stack alignment
     in this case.  */
  if (flag_non_call_exceptions
      && PREFERRED_STACK_BOUNDARY > crtl->preferred_stack_boundary)
    preferred_stack_boundary = PREFERRED_STACK_BOUNDARY;
  else
    preferred_stack_boundary = crtl->preferred_stack_boundary;
  if (preferred_stack_boundary > crtl->stack_alignment_estimated)
    crtl->stack_alignment_estimated = preferred_stack_boundary;
  if (preferred_stack_boundary > crtl->stack_alignment_needed)
    crtl->stack_alignment_needed = preferred_stack_boundary;

  gcc_assert (crtl->stack_alignment_needed
	      <= crtl->stack_alignment_estimated);

  crtl->stack_realign_needed
    = INCOMING_STACK_BOUNDARY < crtl->stack_alignment_estimated;
  crtl->stack_realign_tried = crtl->stack_realign_needed;

  crtl->stack_realign_processed = true;

  /* Target has to redefine TARGET_GET_DRAP_RTX to support stack
     alignment.  */
  gcc_assert (targetm.calls.get_drap_rtx != NULL);
  drap_rtx = targetm.calls.get_drap_rtx (); 

  /* stack_realign_drap and drap_rtx must match.  */
  gcc_assert ((stack_realign_drap != 0) == (drap_rtx != NULL));

  /* Do nothing if NULL is returned, which means DRAP is not needed.  */
  if (NULL != drap_rtx)
    {
      crtl->args.internal_arg_pointer = drap_rtx;

      /* Call fixup_tail_calls to clean up REG_EQUIV note if DRAP is
         needed. */
      fixup_tail_calls ();
    }
}

/* Translate the intermediate representation contained in the CFG
   from GIMPLE trees to RTL.

   We do conversion per basic block and preserve/update the tree CFG.
   This implies we have to do some magic as the CFG can simultaneously
   consist of basic blocks containing RTL and GIMPLE trees.  This can
   confuse the CFG hooks, so be careful to not manipulate CFG during
   the expansion.  */

static unsigned int
gimple_expand_cfg (void)
{
  basic_block bb, init_block;
  sbitmap blocks;
  edge_iterator ei;
  edge e;

  /* Some backends want to know that we are expanding to RTL.  */
  currently_expanding_to_rtl = 1;

  rtl_profile_for_bb (ENTRY_BLOCK_PTR);

  insn_locators_alloc ();
  if (!DECL_BUILT_IN (current_function_decl))
    {
      /* Eventually, all FEs should explicitly set function_start_locus.  */
      if (cfun->function_start_locus == UNKNOWN_LOCATION)
       set_curr_insn_source_location
         (DECL_SOURCE_LOCATION (current_function_decl));
      else
       set_curr_insn_source_location (cfun->function_start_locus);
    }
  set_curr_insn_block (DECL_INITIAL (current_function_decl));
  prologue_locator = curr_insn_locator ();

  /* Make sure first insn is a note even if we don't want linenums.
     This makes sure the first insn will never be deleted.
     Also, final expects a note to appear there.  */
  emit_note (NOTE_INSN_DELETED);

  /* Mark arrays indexed with non-constant indices with TREE_ADDRESSABLE.  */
  discover_nonconstant_array_refs ();

  targetm.expand_to_rtl_hook ();
  crtl->stack_alignment_needed = STACK_BOUNDARY;
  crtl->max_used_stack_slot_alignment = STACK_BOUNDARY;
  crtl->stack_alignment_estimated = 0;
  crtl->preferred_stack_boundary = STACK_BOUNDARY;
  cfun->cfg->max_jumptable_ents = 0;


  /* Expand the variables recorded during gimple lowering.  */
  expand_used_vars ();

  /* Honor stack protection warnings.  */
  if (warn_stack_protect)
    {
      if (cfun->calls_alloca)
	warning (OPT_Wstack_protector, 
		 "not protecting local variables: variable length buffer");
      if (has_short_buffer && !crtl->stack_protect_guard)
	warning (OPT_Wstack_protector, 
		 "not protecting function: no buffer at least %d bytes long",
		 (int) PARAM_VALUE (PARAM_SSP_BUFFER_SIZE));
    }

  /* Set up parameters and prepare for return, for the function.  */
  expand_function_start (current_function_decl);

  /* If this function is `main', emit a call to `__main'
     to run global initializers, etc.  */
  if (DECL_NAME (current_function_decl)
      && MAIN_NAME_P (DECL_NAME (current_function_decl))
      && DECL_FILE_SCOPE_P (current_function_decl))
    expand_main_function ();

  /* Initialize the stack_protect_guard field.  This must happen after the
     call to __main (if any) so that the external decl is initialized.  */
  if (crtl->stack_protect_guard)
    stack_protect_prologue ();

  /* Register rtl specific functions for cfg.  */
  rtl_register_cfg_hooks ();

  init_block = construct_init_block ();

  /* Clear EDGE_EXECUTABLE on the entry edge(s).  It is cleaned from the
     remaining edges in expand_gimple_basic_block.  */
  FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
    e->flags &= ~EDGE_EXECUTABLE;

  lab_rtx_for_bb = pointer_map_create ();
  FOR_BB_BETWEEN (bb, init_block->next_bb, EXIT_BLOCK_PTR, next_bb)
    bb = expand_gimple_basic_block (bb);

  /* Expansion is used by optimization passes too, set maybe_hot_insn_p
     conservatively to true until they are all profile aware.  */
  pointer_map_destroy (lab_rtx_for_bb);
  free_histograms ();

  construct_exit_block ();
  set_curr_insn_block (DECL_INITIAL (current_function_decl));
  insn_locators_finalize ();

  /* We're done expanding trees to RTL.  */
  currently_expanding_to_rtl = 0;

  /* Convert tree EH labels to RTL EH labels and zap the tree EH table.  */
  convert_from_eh_region_ranges ();
  set_eh_throw_stmt_table (cfun, NULL);

  rebuild_jump_labels (get_insns ());
  find_exception_handler_labels ();

  blocks = sbitmap_alloc (last_basic_block);
  sbitmap_ones (blocks);
  find_many_sub_basic_blocks (blocks);
  purge_all_dead_edges ();
  sbitmap_free (blocks);

  compact_blocks ();

  expand_stack_alignment ();

#ifdef ENABLE_CHECKING
  verify_flow_info ();
#endif

  /* There's no need to defer outputting this function any more; we
     know we want to output it.  */
  DECL_DEFER_OUTPUT (current_function_decl) = 0;

  /* Now that we're done expanding trees to RTL, we shouldn't have any
     more CONCATs anywhere.  */
  generating_concat_p = 0;

  if (dump_file)
    {
      fprintf (dump_file,
	       "\n\n;;\n;; Full RTL generated for this function:\n;;\n");
      /* And the pass manager will dump RTL for us.  */
    }

  /* If we're emitting a nested function, make sure its parent gets
     emitted as well.  Doing otherwise confuses debug info.  */
  {
    tree parent;
    for (parent = DECL_CONTEXT (current_function_decl);
	 parent != NULL_TREE;
	 parent = get_containing_scope (parent))
      if (TREE_CODE (parent) == FUNCTION_DECL)
	TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
  }

  /* We are now committed to emitting code for this function.  Do any
     preparation, such as emitting abstract debug info for the inline
     before it gets mangled by optimization.  */
  if (cgraph_function_possibly_inlined_p (current_function_decl))
    (*debug_hooks->outlining_inline_function) (current_function_decl);

  TREE_ASM_WRITTEN (current_function_decl) = 1;

  /* After expanding, the return labels are no longer needed. */
  return_label = NULL;
  naked_return_label = NULL;
  /* Tag the blocks with a depth number so that change_scope can find
     the common parent easily.  */
  set_block_levels (DECL_INITIAL (cfun->decl), 0);
  default_rtl_profile ();
  return 0;
}

struct rtl_opt_pass pass_expand =
{
 {
  RTL_PASS,
  "expand",				/* name */
  NULL,                                 /* gate */
  gimple_expand_cfg,			/* execute */
  NULL,                                 /* sub */
  NULL,                                 /* next */
  0,                                    /* static_pass_number */
  TV_EXPAND,				/* tv_id */
  /* ??? If TER is enabled, we actually receive GENERIC.  */
  PROP_gimple_leh | PROP_cfg,           /* properties_required */
  PROP_rtl,                             /* properties_provided */
  PROP_trees,				/* properties_destroyed */
  0,                                    /* todo_flags_start */
  TODO_dump_func,                       /* todo_flags_finish */
 }
};