summaryrefslogtreecommitdiff
path: root/gcc/tree-chkp-opt.c
blob: 59a0b405bf17c2ffef87360c2c90933ca15318ad (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
/* Pointer Bounds Checker optimization pass.
   Copyright (C) 2014-2015 Free Software Foundation, Inc.
   Contributed by Ilya Enkovich (ilya.enkovich@intel.com)

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 "input.h"
#include "alias.h"
#include "symtab.h"
#include "options.h"
#include "tree.h"
#include "fold-const.h"
#include "target.h"
#include "tree-cfg.h"
#include "tree-pass.h"
#include "is-a.h"
#include "cfgloop.h"
#include "stringpool.h"
#include "tree-ssa-alias.h"
#include "tree-ssanames.h"
#include "tree-ssa-operands.h"
#include "tree-ssa-address.h"
#include "tree-ssa.h"
#include "predict.h"
#include "dominance.h"
#include "cfg.h"
#include "basic-block.h"
#include "tree-ssa-loop-niter.h"
#include "gimple-expr.h"
#include "gimple.h"
#include "tree-phinodes.h"
#include "gimple-ssa.h"
#include "ssa-iterators.h"
#include "gimple-pretty-print.h"
#include "gimple-iterator.h"
#include "gimplify.h"
#include "gimplify-me.h"
#include "tm.h"
#include "hard-reg-set.h"
#include "function.h"
#include "rtl.h"
#include "flags.h"
#include "insn-config.h"
#include "expmed.h"
#include "dojump.h"
#include "explow.h"
#include "calls.h"
#include "emit-rtl.h"
#include "varasm.h"
#include "stmt.h"
#include "expr.h"
#include "tree-chkp.h"
#include "ipa-chkp.h"
#include "diagnostic.h"

enum check_type
{
  CHECK_LOWER_BOUND,
  CHECK_UPPER_BOUND
};

struct pol_item
{
  tree cst;
  tree var;
};

struct address_t
{
  vec<struct pol_item> pol;
};

/* Structure to hold check informtation.  */
struct check_info
{
  /* Type of the check.  */
  check_type type;
  /* Address used for the check.  */
  address_t addr;
  /* Bounds used for the check.  */
  tree bounds;
  /* Check statement.  Can be NULL for removed checks.  */
  gimple stmt;
};

/* Structure to hold checks information for BB.  */
struct bb_checks
{
  vec<struct check_info, va_heap, vl_ptr> checks;
};

static void chkp_collect_value (tree ssa_name, address_t &res);

#define chkp_bndmk_fndecl \
  (targetm.builtin_chkp_function (BUILT_IN_CHKP_BNDMK))
#define chkp_intersect_fndecl \
  (targetm.builtin_chkp_function (BUILT_IN_CHKP_INTERSECT))
#define chkp_checkl_fndecl \
  (targetm.builtin_chkp_function (BUILT_IN_CHKP_BNDCL))
#define chkp_checku_fndecl \
  (targetm.builtin_chkp_function (BUILT_IN_CHKP_BNDCU))

static vec<struct bb_checks, va_heap, vl_ptr> check_infos = vNULL;

/* Comparator for pol_item structures I1 and I2 to be used
   to find items with equal var.  Also used for polynomial
   sorting.  */
static int
chkp_pol_item_compare (const void *i1, const void *i2)
{
  const struct pol_item *p1 = (const struct pol_item *)i1;
  const struct pol_item *p2 = (const struct pol_item *)i2;

  if (p1->var == p2->var)
    return 0;
  else if (p1->var > p2->var)
    return 1;
  else
    return -1;
}

/* Find polynomial item in ADDR with var equal to VAR
   and return its index.  Return -1 if item was not
   found.  */
static int
chkp_pol_find (address_t &addr, tree var)
{
  int left = 0;
  int right = addr.pol.length () - 1;
  int n;

  while (right >= left)
    {
      n = (left + right) / 2;

      if (addr.pol[n].var == var
	  || (var && addr.pol[n].var
	      && TREE_CODE (var) == ADDR_EXPR
	      && TREE_CODE (addr.pol[n].var) == ADDR_EXPR
	      && TREE_OPERAND (var, 0) == TREE_OPERAND (addr.pol[n].var, 0)))
	return n;
      else if (addr.pol[n].var > var)
	right = n - 1;
      else
	left = n + 1;
    }

  return -1;
}

/* Return constant CST extended to size type.  */
static tree
chkp_extend_const (tree cst)
{
  if (TYPE_PRECISION (TREE_TYPE (cst)) < TYPE_PRECISION (size_type_node))
    return build_int_cst_type (size_type_node, tree_to_shwi (cst));

  return cst;
}

/* Add polynomial item CST * VAR to ADDR.  */
static void
chkp_add_addr_item (address_t &addr, tree cst, tree var)
{
  int n = chkp_pol_find (addr, var);

  cst = chkp_extend_const (cst);

  if (n < 0)
    {
      struct pol_item item;
      item.cst = cst;
      item.var = var;

      addr.pol.safe_push (item);
      addr.pol.qsort (&chkp_pol_item_compare);
    }
  else
    {
      addr.pol[n].cst = fold_build2 (PLUS_EXPR, TREE_TYPE (addr.pol[n].cst),
				     addr.pol[n].cst, cst);
      if (TREE_CODE (addr.pol[n].cst) == INTEGER_CST
	  && integer_zerop (addr.pol[n].cst))
	addr.pol.ordered_remove (n);
    }
}

/* Subtract polynomial item CST * VAR from ADDR.  */
static void
chkp_sub_addr_item (address_t &addr, tree cst, tree var)
{
  int n = chkp_pol_find (addr, var);

  cst = chkp_extend_const (cst);

  if (n < 0)
    {
      struct pol_item item;
      item.cst = fold_build2 (MINUS_EXPR, TREE_TYPE (cst),
			      integer_zero_node, cst);
      item.var = var;

      addr.pol.safe_push (item);
      addr.pol.qsort (&chkp_pol_item_compare);
    }
  else
    {
      addr.pol[n].cst = fold_build2 (MINUS_EXPR, TREE_TYPE (addr.pol[n].cst),
				     addr.pol[n].cst, cst);
      if (TREE_CODE (addr.pol[n].cst) == INTEGER_CST
	  && integer_zerop (addr.pol[n].cst))
	addr.pol.ordered_remove (n);
    }
}

/* Add address DELTA to ADDR.  */
static void
chkp_add_addr_addr (address_t &addr, address_t &delta)
{
  unsigned int i;
  for (i = 0; i < delta.pol.length (); i++)
    chkp_add_addr_item (addr, delta.pol[i].cst, delta.pol[i].var);
}

/* Subtract address DELTA from ADDR.  */
static void
chkp_sub_addr_addr (address_t &addr, address_t &delta)
{
  unsigned int i;
  for (i = 0; i < delta.pol.length (); i++)
    chkp_sub_addr_item (addr, delta.pol[i].cst, delta.pol[i].var);
}

/* Mutiply address ADDR by integer constant MULT.  */
static void
chkp_mult_addr (address_t &addr, tree mult)
{
  unsigned int i;
  for (i = 0; i < addr.pol.length (); i++)
    addr.pol[i].cst = fold_build2 (MULT_EXPR, TREE_TYPE (addr.pol[i].cst),
				   addr.pol[i].cst, mult);
}

/* Return 1 if we may prove ADDR has a constant value with
   determined sign, which is put into *SIGN.  Otherwise
   return 0.  */
static bool
chkp_is_constant_addr (const address_t &addr, int *sign)
{
  *sign = 0;

  if (addr.pol.length () == 0)
    return true;
  else if (addr.pol.length () > 1)
    return false;
  else if (addr.pol[0].var)
    return false;
  else if (integer_zerop (addr.pol[0].cst))
    *sign = 0;
  else if  (tree_int_cst_sign_bit (addr.pol[0].cst))
    *sign = -1;
  else
    *sign = 1;

  return true;
}

/* Dump ADDR into dump_file.  */
static void
chkp_print_addr (const address_t &addr)
{
  unsigned int n = 0;
  for (n = 0; n < addr.pol.length (); n++)
    {
      if (n > 0)
	fprintf (dump_file, " + ");

      if (addr.pol[n].var == NULL_TREE)
	print_generic_expr (dump_file, addr.pol[n].cst, 0);
      else
	{
	  if (TREE_CODE (addr.pol[n].cst) != INTEGER_CST
	      || !integer_onep (addr.pol[n].cst))
	    {
	      print_generic_expr (dump_file, addr.pol[n].cst, 0);
	      fprintf (dump_file, " * ");
	    }
	  print_generic_expr (dump_file, addr.pol[n].var, 0);
	}
    }
}

/* Compute value of PTR and put it into address RES.
   PTR has to be ADDR_EXPR.  */
static void
chkp_collect_addr_value (tree ptr, address_t &res)
{
  tree obj = TREE_OPERAND (ptr, 0);
  address_t addr;

  switch (TREE_CODE (obj))
    {
    case INDIRECT_REF:
      chkp_collect_value (TREE_OPERAND (obj, 0), res);
      break;

    case MEM_REF:
      chkp_collect_value (TREE_OPERAND (obj, 0), res);
      addr.pol.create (0);
      chkp_collect_value (TREE_OPERAND (obj, 1), addr);
      chkp_add_addr_addr (res, addr);
      addr.pol.release ();
      break;

    case ARRAY_REF:
      chkp_collect_value (build_fold_addr_expr (TREE_OPERAND (obj, 0)), res);
      addr.pol.create (0);
      chkp_collect_value (TREE_OPERAND (obj, 1), addr);
      chkp_mult_addr (addr, array_ref_element_size (obj));
      chkp_add_addr_addr (res, addr);
      addr.pol.release ();
      break;

    case COMPONENT_REF:
      {
	tree str = TREE_OPERAND (obj, 0);
	tree field = TREE_OPERAND (obj, 1);
	chkp_collect_value (build_fold_addr_expr (str), res);
	addr.pol.create (0);
	chkp_collect_value (component_ref_field_offset (obj), addr);
	chkp_add_addr_addr (res, addr);
	addr.pol.release ();
	if (DECL_FIELD_BIT_OFFSET (field))
	  {
	    addr.pol.create (0);
	    chkp_collect_value (fold_build2 (TRUNC_DIV_EXPR, size_type_node,
					     DECL_FIELD_BIT_OFFSET (field),
					     size_int (BITS_PER_UNIT)),
			   addr);
	    chkp_add_addr_addr (res, addr);
	    addr.pol.release ();
	  }
      }
      break;

    default:
      chkp_add_addr_item (res, integer_one_node, ptr);
      break;
    }
}

/* Compute value of PTR and put it into address RES.  */
static void
chkp_collect_value (tree ptr, address_t &res)
{
  gimple def_stmt;
  enum gimple_code code;
  enum tree_code rhs_code;
  address_t addr;
  tree rhs1;

  if (TREE_CODE (ptr) == INTEGER_CST)
    {
      chkp_add_addr_item (res, ptr, NULL);
      return;
    }
  else if (TREE_CODE (ptr) == ADDR_EXPR)
    {
      chkp_collect_addr_value (ptr, res);
      return;
    }
  else if (TREE_CODE (ptr) != SSA_NAME)
    {
      chkp_add_addr_item (res, integer_one_node, ptr);
      return;
    }

  /* Now we handle the case when polynomial is computed
     for SSA NAME.  */
  def_stmt = SSA_NAME_DEF_STMT (ptr);
  code = gimple_code (def_stmt);

  /* Currently we do not walk through statements other
     than assignment.  */
  if (code != GIMPLE_ASSIGN)
    {
      chkp_add_addr_item (res, integer_one_node, ptr);
      return;
    }

  rhs_code = gimple_assign_rhs_code (def_stmt);
  rhs1 = gimple_assign_rhs1 (def_stmt);

  switch (rhs_code)
    {
    case SSA_NAME:
    case INTEGER_CST:
    case ADDR_EXPR:
      chkp_collect_value (rhs1, res);
      break;

    case PLUS_EXPR:
    case POINTER_PLUS_EXPR:
      chkp_collect_value (rhs1, res);
      addr.pol.create (0);
      chkp_collect_value (gimple_assign_rhs2 (def_stmt), addr);
      chkp_add_addr_addr (res, addr);
      addr.pol.release ();
      break;

    case MINUS_EXPR:
      chkp_collect_value (rhs1, res);
      addr.pol.create (0);
      chkp_collect_value (gimple_assign_rhs2 (def_stmt), addr);
      chkp_sub_addr_addr (res, addr);
      addr.pol.release ();
      break;

    case MULT_EXPR:
      if (TREE_CODE (rhs1) == SSA_NAME
	  && TREE_CODE (gimple_assign_rhs2 (def_stmt)) == INTEGER_CST)
	{
	  chkp_collect_value (rhs1, res);
	  chkp_mult_addr (res, gimple_assign_rhs2 (def_stmt));
	}
      else if (TREE_CODE (gimple_assign_rhs2 (def_stmt)) == SSA_NAME
	       && TREE_CODE (rhs1) == INTEGER_CST)
	{
	  chkp_collect_value (gimple_assign_rhs2 (def_stmt), res);
	  chkp_mult_addr (res, rhs1);
	}
      else
	chkp_add_addr_item (res, integer_one_node, ptr);
      break;

    default:
      chkp_add_addr_item (res, integer_one_node, ptr);
      break;
    }
}

/* Fill check_info structure *CI with information about
   check STMT.  */
static void
chkp_fill_check_info (gimple stmt, struct check_info *ci)
{
  ci->addr.pol.create (0);
  ci->bounds = gimple_call_arg (stmt, 1);
  chkp_collect_value (gimple_call_arg (stmt, 0), ci->addr);
  ci->type = (gimple_call_fndecl (stmt) == chkp_checkl_fndecl
	     ? CHECK_LOWER_BOUND
	     : CHECK_UPPER_BOUND);
  ci->stmt = stmt;
}

/* Release structures holding check information
   for current function.  */
static void
chkp_release_check_info (void)
{
  unsigned int n, m;

  if (check_infos.exists ())
    {
      for (n = 0; n < check_infos.length (); n++)
	{
	  for (m = 0; m < check_infos[n].checks.length (); m++)
	    if (check_infos[n].checks[m].addr.pol.exists ())
	      check_infos[n].checks[m].addr.pol.release ();
	  check_infos[n].checks.release ();
	}
      check_infos.release ();
    }
}

/* Create structures to hold check information
   for current function.  */
static void
chkp_init_check_info (void)
{
  struct bb_checks empty_bbc;
  int n;

  empty_bbc.checks = vNULL;

  chkp_release_check_info ();

  check_infos.create (last_basic_block_for_fn (cfun));
  for (n = 0; n < last_basic_block_for_fn (cfun); n++)
    {
      check_infos.safe_push (empty_bbc);
      check_infos.last ().checks.create (0);
    }
}

/* Find all checks in current function and store info about them
   in check_infos.  */
static void
chkp_gather_checks_info (void)
{
  basic_block bb;
  gimple_stmt_iterator i;

  if (dump_file && (dump_flags & TDF_DETAILS))
    fprintf (dump_file, "Gathering information about checks...\n");

  chkp_init_check_info ();

  FOR_EACH_BB_FN (bb, cfun)
    {
      struct bb_checks *bbc = &check_infos[bb->index];

      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "Searching checks in BB%d...\n", bb->index);

      for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
        {
	  gimple stmt = gsi_stmt (i);

	  if (gimple_code (stmt) != GIMPLE_CALL)
	    continue;

	  if (gimple_call_fndecl (stmt) == chkp_checkl_fndecl
	      || gimple_call_fndecl (stmt) == chkp_checku_fndecl)
	    {
	      struct check_info ci;

	      chkp_fill_check_info (stmt, &ci);
	      bbc->checks.safe_push (ci);

	      if (dump_file && (dump_flags & TDF_DETAILS))
		{
		  fprintf (dump_file, "Adding check information:\n");
		  fprintf (dump_file, "  bounds: ");
		  print_generic_expr (dump_file, ci.bounds, 0);
		  fprintf (dump_file, "\n  address: ");
		  chkp_print_addr (ci.addr);
		  fprintf (dump_file, "\n  check: ");
		  print_gimple_stmt (dump_file, stmt, 0, 0);
		}
	    }
	}
    }
}

/* Return 1 if check CI against BOUNDS always pass,
   -1 if check CI against BOUNDS always fails and
   0 if we cannot compute check result.  */
static int
chkp_get_check_result (struct check_info *ci, tree bounds)
{
  gimple bnd_def;
  address_t bound_val;
  int sign, res = 0;

  if (dump_file && (dump_flags & TDF_DETAILS))
    {
      fprintf (dump_file, "Trying to compute result of the check\n");
      fprintf (dump_file, "  check: ");
      print_gimple_stmt (dump_file, ci->stmt, 0, 0);
      fprintf (dump_file, "  address: ");
      chkp_print_addr (ci->addr);
      fprintf (dump_file, "\n  bounds: ");
      print_generic_expr (dump_file, bounds, 0);
      fprintf (dump_file, "\n");
    }

  if (TREE_CODE (bounds) != SSA_NAME)
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: bounds tree code is not ssa_name\n");
      return 0;
    }

  bnd_def = SSA_NAME_DEF_STMT (bounds);
  /* Currently we handle cases when bounds are result of bndmk
     or loaded static bounds var.  */
  if (gimple_code (bnd_def) == GIMPLE_CALL
      && gimple_call_fndecl (bnd_def) == chkp_bndmk_fndecl)
    {
      bound_val.pol.create (0);
      chkp_collect_value (gimple_call_arg (bnd_def, 0), bound_val);
      if (ci->type == CHECK_UPPER_BOUND)
	{
	  address_t size_val;
	  size_val.pol.create (0);
	  chkp_collect_value (gimple_call_arg (bnd_def, 1), size_val);
	  chkp_add_addr_addr (bound_val, size_val);
	  size_val.pol.release ();
	  chkp_add_addr_item (bound_val, integer_minus_one_node, NULL);
	}
    }
  else if (gimple_code (bnd_def) == GIMPLE_ASSIGN
	   && gimple_assign_rhs1 (bnd_def) == chkp_get_zero_bounds_var ())
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: always pass with zero bounds\n");
      return 1;
    }
  else if (gimple_code (bnd_def) == GIMPLE_ASSIGN
	   && gimple_assign_rhs1 (bnd_def) == chkp_get_none_bounds_var ())
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: always fails with none bounds\n");
      return -1;
    }
  else if (gimple_code (bnd_def) == GIMPLE_ASSIGN
	   && TREE_CODE (gimple_assign_rhs1 (bnd_def)) == VAR_DECL)
    {
      tree bnd_var = gimple_assign_rhs1 (bnd_def);
      tree var;
      tree size;

      if (!DECL_INITIAL (bnd_var)
	  || DECL_INITIAL (bnd_var) == error_mark_node)
	{
	  if (dump_file && (dump_flags & TDF_DETAILS))
	    fprintf (dump_file, "  result: cannot compute bounds\n");
	  return 0;
	}

      gcc_assert (TREE_CODE (DECL_INITIAL (bnd_var)) == ADDR_EXPR);
      var = TREE_OPERAND (DECL_INITIAL (bnd_var), 0);

      bound_val.pol.create (0);
      chkp_collect_value (DECL_INITIAL (bnd_var), bound_val);
      if (ci->type == CHECK_UPPER_BOUND)
	{
	  if (TREE_CODE (var) == VAR_DECL)
	    {
	      if (DECL_SIZE (var)
		  && !chkp_variable_size_type (TREE_TYPE (var)))
		size = DECL_SIZE_UNIT (var);
	      else
		{
		  if (dump_file && (dump_flags & TDF_DETAILS))
		    fprintf (dump_file, "  result: cannot compute bounds\n");
		  return 0;
		}
	    }
	  else
	    {
	      gcc_assert (TREE_CODE (var) == STRING_CST);
	      size = build_int_cst (size_type_node,
				    TREE_STRING_LENGTH (var));
	    }

	  address_t size_val;
	  size_val.pol.create (0);
	  chkp_collect_value (size, size_val);
	  chkp_add_addr_addr (bound_val, size_val);
	  size_val.pol.release ();
	  chkp_add_addr_item (bound_val, integer_minus_one_node, NULL);
	}
    }
  else
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: cannot compute bounds\n");
      return 0;
    }

  if (dump_file && (dump_flags & TDF_DETAILS))
    {
      fprintf (dump_file, "  bound value: ");
      chkp_print_addr (bound_val);
      fprintf (dump_file, "\n");
    }

  chkp_sub_addr_addr (bound_val, ci->addr);

  if (!chkp_is_constant_addr (bound_val, &sign))
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: cannot compute result\n");

      res = 0;
    }
  else if (sign == 0
	   || (ci->type == CHECK_UPPER_BOUND && sign > 0)
	   || (ci->type == CHECK_LOWER_BOUND && sign < 0))
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: always pass\n");

      res = 1;
    }
  else
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  result: always fail\n");

      res = -1;
    }

  bound_val.pol.release ();

  return res;
}

/* Try to compare bounds value and address value
   used in the check CI.  If we can prove that check
   always pass then remove it.  */
static void
chkp_remove_check_if_pass (struct check_info *ci)
{
  int result = 0;

  if (dump_file && (dump_flags & TDF_DETAILS))
    {
      fprintf (dump_file, "Trying to remove check: ");
      print_gimple_stmt (dump_file, ci->stmt, 0, 0);
    }

  result = chkp_get_check_result (ci, ci->bounds);

  if (result == 1)
    {
      gimple_stmt_iterator i = gsi_for_stmt (ci->stmt);

      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  action: delete check (always pass)\n");

      gsi_remove (&i, true);
      unlink_stmt_vdef (ci->stmt);
      release_defs (ci->stmt);
      ci->stmt = NULL;
    }
  else if (result == -1)
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  action: keep check (always fail)\n");
      warning_at (gimple_location (ci->stmt), OPT_Wchkp,
		  "memory access check always fail");
    }
  else if (result == 0)
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	fprintf (dump_file, "  action: keep check (cannot compute result)\n");
    }
}

/* For bounds used in CI check if bounds are produced by
   intersection and we may use outer bounds instead.  If
   transformation is possible then fix check statement and
   recompute its info.  */
static void
chkp_use_outer_bounds_if_possible (struct check_info *ci)
{
  gimple bnd_def;
  tree bnd1, bnd2, bnd_res = NULL;
  int check_res1, check_res2;

  if (TREE_CODE (ci->bounds) != SSA_NAME)
    return;

  bnd_def = SSA_NAME_DEF_STMT (ci->bounds);
  if (gimple_code (bnd_def) != GIMPLE_CALL
      || gimple_call_fndecl (bnd_def) != chkp_intersect_fndecl)
    return;

  if (dump_file && (dump_flags & TDF_DETAILS))
    {
      fprintf (dump_file, "Check if bounds intersection is redundant: \n");
      fprintf (dump_file, "  check: ");
      print_gimple_stmt (dump_file, ci->stmt, 0, 0);
      fprintf (dump_file, "  intersection: ");
      print_gimple_stmt (dump_file, bnd_def, 0, 0);
      fprintf (dump_file, "\n");
    }

  bnd1 = gimple_call_arg (bnd_def, 0);
  bnd2 = gimple_call_arg (bnd_def, 1);

  check_res1 = chkp_get_check_result (ci, bnd1);
  check_res2 = chkp_get_check_result (ci, bnd2);
  if (check_res1 == 1)
    bnd_res = bnd2;
  else if (check_res1 == -1)
    bnd_res = bnd1;
  else if (check_res2 == 1)
    bnd_res = bnd1;
  else if (check_res2 == -1)
    bnd_res = bnd2;

  if (bnd_res)
    {
      if (dump_file && (dump_flags & TDF_DETAILS))
	{
	  fprintf (dump_file, "  action: use ");
	  print_generic_expr (dump_file, bnd2, 0);
	  fprintf (dump_file, " instead of ");
	  print_generic_expr (dump_file, ci->bounds, 0);
	  fprintf (dump_file, "\n");
	}

      ci->bounds = bnd_res;
      gimple_call_set_arg (ci->stmt, 1, bnd_res);
      update_stmt (ci->stmt);
      chkp_fill_check_info (ci->stmt, ci);
    }
}

/*  Try to find checks whose bounds were produced by intersection
    which does not affect check result.  In such check outer bounds
    are used instead.  It allows to remove excess intersections
    and helps to compare checks.  */
static void
chkp_remove_excess_intersections (void)
{
  basic_block bb;

  if (dump_file && (dump_flags & TDF_DETAILS))
    fprintf (dump_file, "Searching for redundant bounds intersections...\n");

  FOR_EACH_BB_FN (bb, cfun)
    {
      struct bb_checks *bbc = &check_infos[bb->index];
      unsigned int no;

      /* Iterate through all found checks in BB.  */
      for (no = 0; no < bbc->checks.length (); no++)
	if (bbc->checks[no].stmt)
	  chkp_use_outer_bounds_if_possible (&bbc->checks[no]);
    }
}

/*  Try to remove all checks which are known to alwyas pass.  */
static void
chkp_remove_constant_checks (void)
{
  basic_block bb;

  if (dump_file && (dump_flags & TDF_DETAILS))
    fprintf (dump_file, "Searching for redundant checks...\n");

  FOR_EACH_BB_FN (bb, cfun)
    {
      struct bb_checks *bbc = &check_infos[bb->index];
      unsigned int no;

      /* Iterate through all found checks in BB.  */
      for (no = 0; no < bbc->checks.length (); no++)
	if (bbc->checks[no].stmt)
	  chkp_remove_check_if_pass (&bbc->checks[no]);
    }
}

/* Return fast version of string function FNCODE.  */
static tree
chkp_get_nobnd_fndecl (enum built_in_function fncode)
{
  /* Check if we are allowed to use fast string functions.  */
  if (!flag_chkp_use_fast_string_functions)
    return NULL_TREE;

  tree fndecl = NULL_TREE;

  switch (fncode)
    {
    case BUILT_IN_MEMCPY_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMCPY_NOBND);
      break;

    case BUILT_IN_MEMPCPY_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMPCPY_NOBND);
      break;

    case BUILT_IN_MEMMOVE_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMMOVE_NOBND);
      break;

    case BUILT_IN_MEMSET_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMSET_NOBND);
      break;

    case BUILT_IN_CHKP_MEMCPY_NOCHK_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMCPY_NOBND_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMPCPY_NOCHK_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMPCPY_NOBND_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMMOVE_NOCHK_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMMOVE_NOBND_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMSET_NOCHK_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMSET_NOBND_NOCHK);
      break;

    default:
      break;
    }

  if (fndecl)
    fndecl = chkp_maybe_clone_builtin_fndecl (fndecl);

  return fndecl;
}


/* Return no-check version of string function FNCODE.  */
static tree
chkp_get_nochk_fndecl (enum built_in_function fncode)
{
  /* Check if we are allowed to use fast string functions.  */
  if (!flag_chkp_use_nochk_string_functions)
    return NULL_TREE;

  tree fndecl = NULL_TREE;

  switch (fncode)
    {
    case BUILT_IN_MEMCPY_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMCPY_NOCHK);
      break;

    case BUILT_IN_MEMPCPY_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMPCPY_NOCHK);
      break;

    case BUILT_IN_MEMMOVE_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMMOVE_NOCHK);
      break;

    case BUILT_IN_MEMSET_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMSET_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMCPY_NOBND_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMCPY_NOBND_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMPCPY_NOBND_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMPCPY_NOBND_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMMOVE_NOBND_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMMOVE_NOBND_NOCHK);
      break;

    case BUILT_IN_CHKP_MEMSET_NOBND_CHKP:
      fndecl = builtin_decl_implicit (BUILT_IN_CHKP_MEMSET_NOBND_NOCHK);
      break;

    default:
      break;
    }

  if (fndecl)
    fndecl = chkp_maybe_clone_builtin_fndecl (fndecl);

  return fndecl;
}

/* Find memcpy, mempcpy, memmove and memset calls, perform
   checks before call and then call no_chk version of
   functions.  We do it on O2 to enable inlining of these
   functions during expand.

   Also try to find memcpy, mempcpy, memmove and memset calls
   which are known to not write pointers to memory and use
   faster function versions for them.  */
static void
chkp_optimize_string_function_calls (void)
{
  basic_block bb;

  if (dump_file && (dump_flags & TDF_DETAILS))
    fprintf (dump_file, "Searching for replaceable string function calls...\n");

  FOR_EACH_BB_FN (bb, cfun)
    {
      gimple_stmt_iterator i;

      for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
        {
	  gimple stmt = gsi_stmt (i);
	  tree fndecl;

	  if (gimple_code (stmt) != GIMPLE_CALL
	      || !gimple_call_with_bounds_p (stmt))
	    continue;

	  fndecl = gimple_call_fndecl (stmt);

	  if (!fndecl || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL)
	    continue;

	  if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMCPY_CHKP
	      || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMPCPY_CHKP
	      || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMMOVE_CHKP
	      || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMSET_CHKP)
	    {
	      tree dst = gimple_call_arg (stmt, 0);
	      tree dst_bnd = gimple_call_arg (stmt, 1);
	      bool is_memset = DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMSET_CHKP;
	      tree size = gimple_call_arg (stmt, is_memset ? 3 : 4);
	      tree fndecl_nochk;
	      gimple_stmt_iterator j;
	      basic_block check_bb;
	      address_t size_val;
	      int sign;
	      bool known;

	      /* We may replace call with corresponding __chkp_*_nobnd
		 call in case destination pointer base type is not
		 void or pointer.  */
	      if (POINTER_TYPE_P (TREE_TYPE (dst))
		  && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (dst)))
		  && !chkp_type_has_pointer (TREE_TYPE (TREE_TYPE (dst))))
		{
		  tree fndecl_nobnd
		    = chkp_get_nobnd_fndecl (DECL_FUNCTION_CODE (fndecl));

		  if (fndecl_nobnd)
		    fndecl = fndecl_nobnd;
		}

	      fndecl_nochk = chkp_get_nochk_fndecl (DECL_FUNCTION_CODE (fndecl));

	      if (fndecl_nochk)
		fndecl = fndecl_nochk;

	      if (fndecl != gimple_call_fndecl (stmt))
		{
		  if (dump_file && (dump_flags & TDF_DETAILS))
		    {
		      fprintf (dump_file, "Replacing call: ");
		      print_gimple_stmt (dump_file, stmt, 0,
					 TDF_VOPS|TDF_MEMSYMS);
		    }

		  gimple_call_set_fndecl (stmt, fndecl);

		  if (dump_file && (dump_flags & TDF_DETAILS))
		    {
		      fprintf (dump_file, "With a new call: ");
		      print_gimple_stmt (dump_file, stmt, 0,
					 TDF_VOPS|TDF_MEMSYMS);
		    }
		}

	      /* If there is no nochk version of function then
		 do nothing.  Otherwise insert checks before
		 the call.  */
	      if (!fndecl_nochk)
		continue;

	      /* If size passed to call is known and > 0
		 then we may insert checks unconditionally.  */
	      size_val.pol.create (0);
	      chkp_collect_value (size, size_val);
	      known = chkp_is_constant_addr (size_val, &sign);
	      size_val.pol.release ();

	      /* If we are not sure size is not zero then we have
		 to perform runtime check for size and perform
		 checks only when size is not zero.  */
	      if (!known)
		{
		  gimple check = gimple_build_cond (NE_EXPR,
						    size,
						    size_zero_node,
						    NULL_TREE,
						    NULL_TREE);

		  /* Split block before string function call.  */
		  gsi_prev (&i);
		  check_bb = insert_cond_bb (bb, gsi_stmt (i), check);

		  /* Set position for checks.  */
		  j = gsi_last_bb (check_bb);

		  /* The block was splitted and therefore we
		     need to set iterator to its end.  */
		  i = gsi_last_bb (bb);
		}
	      /* If size is known to be zero then no checks
		 should be performed.  */
	      else if (!sign)
		continue;
	      else
		j = i;

	      size = size_binop (MINUS_EXPR, size, size_one_node);
	      if (!is_memset)
		{
		  tree src = gimple_call_arg (stmt, 2);
		  tree src_bnd = gimple_call_arg (stmt, 3);

		  chkp_check_mem_access (src, fold_build_pointer_plus (src, size),
					 src_bnd, j, gimple_location (stmt),
					 integer_zero_node);
		}

	      chkp_check_mem_access (dst, fold_build_pointer_plus (dst, size),
				     dst_bnd, j, gimple_location (stmt),
				     integer_one_node);

	    }
	}
    }
}

/* Intrumentation pass inserts most of bounds creation code
   in the header of the function.  We want to move bounds
   creation closer to bounds usage to reduce bounds lifetime.
   We also try to avoid bounds creation code on paths where
   bounds are not used.  */
static void
chkp_reduce_bounds_lifetime (void)
{
  basic_block bb = FALLTHRU_EDGE (ENTRY_BLOCK_PTR_FOR_FN (cfun))->dest;
  gimple_stmt_iterator i;

  for (i = gsi_start_bb (bb); !gsi_end_p (i); )
    {
      gimple dom_use, use_stmt, stmt = gsi_stmt (i);
      basic_block dom_bb;
      ssa_op_iter iter;
      imm_use_iterator use_iter;
      use_operand_p use_p;
      tree op;
      bool want_move = false;
      bool deps = false;

      if (gimple_code (stmt) == GIMPLE_CALL
	  && gimple_call_fndecl (stmt) == chkp_bndmk_fndecl)
	want_move = true;

      if (gimple_code (stmt) == GIMPLE_ASSIGN
	  && POINTER_BOUNDS_P (gimple_assign_lhs (stmt))
	  && gimple_assign_rhs_code (stmt) == VAR_DECL)
	want_move = true;

      if (!want_move)
	{
	  gsi_next (&i);
	  continue;
	}

      /* Check we do not increase other values lifetime.  */
      FOR_EACH_PHI_OR_STMT_USE (use_p, stmt, iter, SSA_OP_USE)
	{
	  op = USE_FROM_PTR (use_p);

	  if (TREE_CODE (op) == SSA_NAME
	      && gimple_code (SSA_NAME_DEF_STMT (op)) != GIMPLE_NOP)
	    {
	      deps = true;
	      break;
	    }
	}

      if (deps)
	{
	  gsi_next (&i);
	  continue;
	}

      /* Check all usages of bounds.  */
      if (gimple_code (stmt) == GIMPLE_CALL)
	op = gimple_call_lhs (stmt);
      else
	{
	  gcc_assert (gimple_code (stmt) == GIMPLE_ASSIGN);
	  op = gimple_assign_lhs (stmt);
	}

      dom_use = NULL;
      dom_bb = NULL;

      FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, op)
	{
	  if (is_gimple_debug (use_stmt))
	    continue;

	  if (dom_bb &&
	      dominated_by_p (CDI_DOMINATORS,
			      dom_bb, gimple_bb (use_stmt)))
	    {
	      dom_use = use_stmt;
	      dom_bb = NULL;
	    }
	  else if (dom_bb)
	    dom_bb = nearest_common_dominator (CDI_DOMINATORS, dom_bb,
					       gimple_bb (use_stmt));
	  else if (!dom_use)
	    dom_use = use_stmt;
	  else if (stmt_dominates_stmt_p (use_stmt, dom_use))
	    dom_use = use_stmt;
	  else if (!stmt_dominates_stmt_p (dom_use, use_stmt)
		   /* If dom_use and use_stmt are PHI nodes in one BB
		      then it is OK to keep any of them as dom_use.
		      stmt_dominates_stmt_p returns 0 for such
		      combination, so check it here manually.  */
		   && (gimple_code (dom_use) != GIMPLE_PHI
		       || gimple_code (use_stmt) != GIMPLE_PHI
		       || gimple_bb (use_stmt) != gimple_bb (dom_use))
		   )
	    {
	      dom_bb = nearest_common_dominator (CDI_DOMINATORS,
						 gimple_bb (use_stmt),
						 gimple_bb (dom_use));
	      dom_use = NULL;
	    }
	}

      /* In case there is a single use, just move bounds
	 creation to the use.  */
      if (dom_use || dom_bb)
	{
	  if (dump_file && (dump_flags & TDF_DETAILS))
	    {
	      fprintf (dump_file, "Moving creation of ");
	      print_generic_expr (dump_file, op, 0);
	      fprintf (dump_file, " down to its use.\n");
	    }

	  if (dom_use && gimple_code (dom_use) == GIMPLE_PHI)
	    {
	      dom_bb = get_immediate_dominator (CDI_DOMINATORS,
						gimple_bb (dom_use));
	      dom_use = NULL;
	    }

	  if (dom_bb == bb
	      || (dom_use && gimple_bb (dom_use) == bb))
	    {
		  if (dump_file && (dump_flags & TDF_DETAILS))
		    fprintf (dump_file, "Cannot move statement bacause there is no "
			     "suitable dominator block other than entry block.\n");

		  gsi_next (&i);
	    }
	  else
	    {
	      if (dom_bb)
		{
		  gimple_stmt_iterator last = gsi_last_bb (dom_bb);
		  if (!gsi_end_p (last) && stmt_ends_bb_p (gsi_stmt (last)))
		    gsi_move_before (&i, &last);
		  else
		    gsi_move_after (&i, &last);
		}
	      else
		{
		  gimple_stmt_iterator gsi = gsi_for_stmt (dom_use);
		  gsi_move_before (&i, &gsi);
		}

	      update_stmt (stmt);
	    }
	}
      else
	gsi_next (&i);
    }
}

/* Initilize checker optimization pass.  */
static void
chkp_opt_init (void)
{
  check_infos.create (0);

  calculate_dominance_info (CDI_DOMINATORS);
  calculate_dominance_info (CDI_POST_DOMINATORS);

  /* With LTO constant bounds vars may be not initialized by now.
     Get constant bounds vars to handle their assignments during
     optimizations.  */
  chkp_get_zero_bounds_var ();
  chkp_get_none_bounds_var ();
}

/* Finalise checker optimization  pass.  */
static void
chkp_opt_fini (void)
{
  chkp_fix_cfg ();
}

/* Checker optimization pass function.  */
static unsigned int
chkp_opt_execute (void)
{
  chkp_opt_init();

  /* This optimization may introduce new checks
     and thus we put it before checks search.  */
  chkp_optimize_string_function_calls ();

  chkp_gather_checks_info ();

  chkp_remove_excess_intersections ();

  chkp_remove_constant_checks ();

  chkp_reduce_bounds_lifetime ();

  chkp_release_check_info ();

  chkp_opt_fini ();

  return 0;
}

/* Pass gate.  */
static bool
chkp_opt_gate (void)
{
  return chkp_function_instrumented_p (cfun->decl)
    && (flag_chkp_optimize > 0
	|| (flag_chkp_optimize == -1 && optimize > 0));
}

namespace {

const pass_data pass_data_chkp_opt =
{
  GIMPLE_PASS, /* type */
  "chkpopt", /* name */
  OPTGROUP_NONE, /* optinfo_flags */
  TV_NONE, /* tv_id */
  PROP_ssa | PROP_cfg, /* properties_required */
  0, /* properties_provided */
  0, /* properties_destroyed */
  0, /* todo_flags_start */
  TODO_verify_il
  | TODO_update_ssa /* todo_flags_finish */
};

class pass_chkp_opt : public gimple_opt_pass
{
public:
  pass_chkp_opt (gcc::context *ctxt)
    : gimple_opt_pass (pass_data_chkp_opt, ctxt)
  {}

  /* opt_pass methods: */
  virtual opt_pass * clone ()
    {
      return new pass_chkp_opt (m_ctxt);
    }

  virtual bool gate (function *)
    {
      return chkp_opt_gate ();
    }

  virtual unsigned int execute (function *)
    {
      return chkp_opt_execute ();
    }

}; // class pass_chkp_opt

} // anon namespace

gimple_opt_pass *
make_pass_chkp_opt (gcc::context *ctxt)
{
  return new pass_chkp_opt (ctxt);
}