/
BuildLibCalls.cpp
1455 lines (1353 loc) · 50.3 KB
/
BuildLibCalls.cpp
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
//===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements some functions that will create standard C libcalls.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/BuildLibCalls.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/Analysis/MemoryBuiltins.h"
using namespace llvm;
#define DEBUG_TYPE "build-libcalls"
//- Infer Attributes ---------------------------------------------------------//
STATISTIC(NumReadNone, "Number of functions inferred as readnone");
STATISTIC(NumReadOnly, "Number of functions inferred as readonly");
STATISTIC(NumArgMemOnly, "Number of functions inferred as argmemonly");
STATISTIC(NumNoUnwind, "Number of functions inferred as nounwind");
STATISTIC(NumNoCapture, "Number of arguments inferred as nocapture");
STATISTIC(NumWriteOnlyArg, "Number of arguments inferred as writeonly");
STATISTIC(NumReadOnlyArg, "Number of arguments inferred as readonly");
STATISTIC(NumNoAlias, "Number of function returns inferred as noalias");
STATISTIC(NumNoUndef, "Number of function returns inferred as noundef returns");
STATISTIC(NumNonNull, "Number of function returns inferred as nonnull returns");
STATISTIC(NumReturnedArg, "Number of arguments inferred as returned");
static bool setDoesNotAccessMemory(Function &F) {
if (F.doesNotAccessMemory())
return false;
F.setDoesNotAccessMemory();
++NumReadNone;
return true;
}
static bool setOnlyReadsMemory(Function &F) {
if (F.onlyReadsMemory())
return false;
F.setOnlyReadsMemory();
++NumReadOnly;
return true;
}
static bool setOnlyAccessesArgMemory(Function &F) {
if (F.onlyAccessesArgMemory())
return false;
F.setOnlyAccessesArgMemory();
++NumArgMemOnly;
return true;
}
static bool setDoesNotThrow(Function &F) {
if (F.doesNotThrow())
return false;
F.setDoesNotThrow();
++NumNoUnwind;
return true;
}
static bool setRetDoesNotAlias(Function &F) {
if (F.hasAttribute(AttributeList::ReturnIndex, Attribute::NoAlias))
return false;
F.addAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
++NumNoAlias;
return true;
}
static bool setDoesNotCapture(Function &F, unsigned ArgNo) {
if (F.hasParamAttribute(ArgNo, Attribute::NoCapture))
return false;
F.addParamAttr(ArgNo, Attribute::NoCapture);
++NumNoCapture;
return true;
}
static bool setDoesNotAlias(Function &F, unsigned ArgNo) {
if (F.hasParamAttribute(ArgNo, Attribute::NoAlias))
return false;
F.addParamAttr(ArgNo, Attribute::NoAlias);
++NumNoAlias;
return true;
}
static bool setOnlyReadsMemory(Function &F, unsigned ArgNo) {
if (F.hasParamAttribute(ArgNo, Attribute::ReadOnly))
return false;
F.addParamAttr(ArgNo, Attribute::ReadOnly);
++NumReadOnlyArg;
return true;
}
static bool setOnlyWritesMemory(Function &F, unsigned ArgNo) {
if (F.hasParamAttribute(ArgNo, Attribute::WriteOnly))
return false;
F.addParamAttr(ArgNo, Attribute::WriteOnly);
++NumWriteOnlyArg;
return true;
}
static bool setRetNoUndef(Function &F) {
if (!F.getReturnType()->isVoidTy() &&
!F.hasAttribute(AttributeList::ReturnIndex, Attribute::NoUndef)) {
F.addAttribute(AttributeList::ReturnIndex, Attribute::NoUndef);
++NumNoUndef;
return true;
}
return false;
}
static bool setArgsNoUndef(Function &F) {
bool Changed = false;
for (unsigned ArgNo = 0; ArgNo < F.arg_size(); ++ArgNo) {
if (!F.hasParamAttribute(ArgNo, Attribute::NoUndef)) {
F.addParamAttr(ArgNo, Attribute::NoUndef);
++NumNoUndef;
Changed = true;
}
}
return Changed;
}
static bool setRetAndArgsNoUndef(Function &F) {
return setRetNoUndef(F) | setArgsNoUndef(F);
}
static bool setRetNonNull(Function &F) {
assert(F.getReturnType()->isPointerTy() &&
"nonnull applies only to pointers");
if (F.hasAttribute(AttributeList::ReturnIndex, Attribute::NonNull))
return false;
F.addAttribute(AttributeList::ReturnIndex, Attribute::NonNull);
++NumNonNull;
return true;
}
static bool setReturnedArg(Function &F, unsigned ArgNo) {
if (F.hasParamAttribute(ArgNo, Attribute::Returned))
return false;
F.addParamAttr(ArgNo, Attribute::Returned);
++NumReturnedArg;
return true;
}
static bool setNonLazyBind(Function &F) {
if (F.hasFnAttribute(Attribute::NonLazyBind))
return false;
F.addFnAttr(Attribute::NonLazyBind);
return true;
}
static bool setDoesNotFreeMemory(Function &F) {
if (F.hasFnAttribute(Attribute::NoFree))
return false;
F.addFnAttr(Attribute::NoFree);
return true;
}
bool llvm::inferLibFuncAttributes(Module *M, StringRef Name,
const TargetLibraryInfo &TLI) {
Function *F = M->getFunction(Name);
if (!F)
return false;
return inferLibFuncAttributes(*F, TLI);
}
bool llvm::inferLibFuncAttributes(Function &F, const TargetLibraryInfo &TLI) {
LibFunc TheLibFunc;
if (!(TLI.getLibFunc(F, TheLibFunc) && TLI.has(TheLibFunc)))
return false;
bool Changed = false;
if(!isLibFreeFunction(&F, TheLibFunc) && !isReallocLikeFn(&F, &TLI))
Changed |= setDoesNotFreeMemory(F);
if (F.getParent() != nullptr && F.getParent()->getRtLibUseGOT())
Changed |= setNonLazyBind(F);
switch (TheLibFunc) {
case LibFunc_strlen:
case LibFunc_wcslen:
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_strchr:
case LibFunc_strrchr:
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_strtol:
case LibFunc_strtod:
case LibFunc_strtof:
case LibFunc_strtoul:
case LibFunc_strtoll:
case LibFunc_strtold:
case LibFunc_strtoull:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_strcpy:
case LibFunc_strncpy:
case LibFunc_strcat:
case LibFunc_strncat:
Changed |= setReturnedArg(F, 0);
LLVM_FALLTHROUGH;
case LibFunc_stpcpy:
case LibFunc_stpncpy:
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotAlias(F, 1);
return Changed;
case LibFunc_strxfrm:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_strcmp: // 0,1
case LibFunc_strspn: // 0,1
case LibFunc_strncmp: // 0,1
case LibFunc_strcspn: // 0,1
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_strcoll:
case LibFunc_strcasecmp: // 0,1
case LibFunc_strncasecmp: //
// Those functions may depend on the locale, which may be accessed through
// global memory.
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_strstr:
case LibFunc_strpbrk:
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_strtok:
case LibFunc_strtok_r:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_scanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_setbuf:
case LibFunc_setvbuf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_strdup:
case LibFunc_strndup:
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_stat:
case LibFunc_statvfs:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_sscanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_sprintf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotAlias(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_snprintf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotAlias(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_setitimer:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_system:
// May throw; "system" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_malloc:
Changed |= setRetNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_memcmp:
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_memchr:
case LibFunc_memrchr:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setOnlyReadsMemory(F);
return Changed;
case LibFunc_modf:
case LibFunc_modff:
case LibFunc_modfl:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_memcpy:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setReturnedArg(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setDoesNotAlias(F, 1);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_memmove:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setReturnedArg(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_mempcpy:
case LibFunc_memccpy:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setDoesNotAlias(F, 1);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_memcpy_chk:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_memalign:
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_mkdir:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_mktime:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_realloc:
Changed |= setRetNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_reallocf:
Changed |= setRetNoUndef(F);
return Changed;
case LibFunc_read:
// May throw; "read" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_rewind:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_rmdir:
case LibFunc_remove:
case LibFunc_realpath:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_rename:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_readlink:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_write:
// May throw; "write" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_aligned_alloc:
Changed |= setRetNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_bcopy:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyWritesMemory(F, 1);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_bcmp:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_bzero:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
return Changed;
case LibFunc_calloc:
Changed |= setRetNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_chmod:
case LibFunc_chown:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_ctermid:
case LibFunc_clearerr:
case LibFunc_closedir:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_atoi:
case LibFunc_atol:
case LibFunc_atof:
case LibFunc_atoll:
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_access:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_fopen:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_fdopen:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_feof:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_free:
Changed |= setArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_fseek:
case LibFunc_ftell:
case LibFunc_fgetc:
case LibFunc_fgetc_unlocked:
case LibFunc_fseeko:
case LibFunc_ftello:
case LibFunc_fileno:
case LibFunc_fflush:
case LibFunc_fclose:
case LibFunc_fsetpos:
case LibFunc_flockfile:
case LibFunc_funlockfile:
case LibFunc_ftrylockfile:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_ferror:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F);
return Changed;
case LibFunc_fputc:
case LibFunc_fputc_unlocked:
case LibFunc_fstat:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_frexp:
case LibFunc_frexpf:
case LibFunc_frexpl:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_fstatvfs:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_fgets:
case LibFunc_fgets_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc_fread:
case LibFunc_fread_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 3);
return Changed;
case LibFunc_fwrite:
case LibFunc_fwrite_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 3);
// FIXME: readonly #1?
return Changed;
case LibFunc_fputs:
case LibFunc_fputs_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_fscanf:
case LibFunc_fprintf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_fgetpos:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_getc:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_getlogin_r:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_getc_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_getenv:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_gets:
case LibFunc_getchar:
case LibFunc_getchar_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_getitimer:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_getpwnam:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_ungetc:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_uname:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_unlink:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_unsetenv:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_utime:
case LibFunc_utimes:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_putc:
case LibFunc_putc_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_puts:
case LibFunc_printf:
case LibFunc_perror:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_pread:
// May throw; "pread" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_pwrite:
// May throw; "pwrite" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_putchar:
case LibFunc_putchar_unlocked:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc_popen:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_pclose:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_vscanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_vsscanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_vfscanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_valloc:
Changed |= setRetNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_vprintf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_vfprintf:
case LibFunc_vsprintf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_vsnprintf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc_open:
// May throw; "open" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_opendir:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_tmpfile:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_times:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_htonl:
case LibFunc_htons:
case LibFunc_ntohl:
case LibFunc_ntohs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAccessMemory(F);
return Changed;
case LibFunc_lstat:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_lchown:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_qsort:
// May throw; places call through function pointer.
// Cannot give undef pointer/size
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 3);
return Changed;
case LibFunc_dunder_strdup:
case LibFunc_dunder_strndup:
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_dunder_strtok_r:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_under_IO_getc:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_under_IO_putc:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_dunder_isoc99_scanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_stat64:
case LibFunc_lstat64:
case LibFunc_statvfs64:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_dunder_isoc99_sscanf:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_fopen64:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 0);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc_fseeko64:
case LibFunc_ftello64:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
return Changed;
case LibFunc_tmpfile64:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
case LibFunc_fstat64:
case LibFunc_fstatvfs64:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_open64:
// May throw; "open" is a valid pthread cancellation point.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyReadsMemory(F, 0);
return Changed;
case LibFunc_gettimeofday:
// Currently some platforms have the restrict keyword on the arguments to
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
// arguments.
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc_Znwj: // new(unsigned int)
case LibFunc_Znwm: // new(unsigned long)
case LibFunc_Znaj: // new[](unsigned int)
case LibFunc_Znam: // new[](unsigned long)
case LibFunc_msvc_new_int: // new(unsigned int)
case LibFunc_msvc_new_longlong: // new(unsigned long long)
case LibFunc_msvc_new_array_int: // new[](unsigned int)
case LibFunc_msvc_new_array_longlong: // new[](unsigned long long)
// Operator new always returns a nonnull noalias pointer
Changed |= setRetNoUndef(F);
Changed |= setRetNonNull(F);
Changed |= setRetDoesNotAlias(F);
return Changed;
// TODO: add LibFunc entries for:
// case LibFunc_memset_pattern4:
// case LibFunc_memset_pattern8:
case LibFunc_memset_pattern16:
Changed |= setOnlyAccessesArgMemory(F);
Changed |= setDoesNotCapture(F, 0);
Changed |= setOnlyWritesMemory(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
// int __nvvm_reflect(const char *)
case LibFunc_nvvm_reflect:
Changed |= setRetAndArgsNoUndef(F);
Changed |= setDoesNotAccessMemory(F);
Changed |= setDoesNotThrow(F);
return Changed;
default:
// FIXME: It'd be really nice to cover all the library functions we're
// aware of here.
return false;
}
}
bool llvm::hasFloatFn(const TargetLibraryInfo *TLI, Type *Ty,
LibFunc DoubleFn, LibFunc FloatFn, LibFunc LongDoubleFn) {
switch (Ty->getTypeID()) {
case Type::HalfTyID:
return false;
case Type::FloatTyID:
return TLI->has(FloatFn);
case Type::DoubleTyID:
return TLI->has(DoubleFn);
default:
return TLI->has(LongDoubleFn);
}
}
StringRef llvm::getFloatFnName(const TargetLibraryInfo *TLI, Type *Ty,
LibFunc DoubleFn, LibFunc FloatFn,
LibFunc LongDoubleFn) {
assert(hasFloatFn(TLI, Ty, DoubleFn, FloatFn, LongDoubleFn) &&
"Cannot get name for unavailable function!");
switch (Ty->getTypeID()) {
case Type::HalfTyID:
llvm_unreachable("No name for HalfTy!");
case Type::FloatTyID:
return TLI->getName(FloatFn);
case Type::DoubleTyID:
return TLI->getName(DoubleFn);
default:
return TLI->getName(LongDoubleFn);
}
}
//- Emit LibCalls ------------------------------------------------------------//
Value *llvm::castToCStr(Value *V, IRBuilderBase &B) {
unsigned AS = V->getType()->getPointerAddressSpace();
return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
}
static Value *emitLibCall(LibFunc TheLibFunc, Type *ReturnType,