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
|
//===--- CodeGenModule.h - Per-Module state for LLVM CodeGen ----*- C++ -*-===//
//
// 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 is the internal per-translation-unit state used for llvm translation.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
#define LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
#include "CGVTables.h"
#include "CodeGenTypeCache.h"
#include "CodeGenTypes.h"
#include "SanitizerMetadata.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclOpenMP.h"
#include "clang/AST/GlobalDecl.h"
#include "clang/AST/Mangle.h"
#include "clang/Basic/ABI.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/Module.h"
#include "clang/Basic/NoSanitizeList.h"
#include "clang/Basic/ProfileList.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/XRayLists.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Transforms/Utils/SanitizerStats.h"
#include <optional>
namespace llvm {
class Module;
class Constant;
class ConstantInt;
class Function;
class GlobalValue;
class DataLayout;
class FunctionType;
class LLVMContext;
class IndexedInstrProfReader;
namespace vfs {
class FileSystem;
}
}
namespace clang {
class ASTContext;
class AtomicType;
class FunctionDecl;
class IdentifierInfo;
class ObjCImplementationDecl;
class ObjCEncodeExpr;
class BlockExpr;
class CharUnits;
class Decl;
class Expr;
class Stmt;
class StringLiteral;
class NamedDecl;
class ValueDecl;
class VarDecl;
class LangOptions;
class CodeGenOptions;
class HeaderSearchOptions;
class DiagnosticsEngine;
class AnnotateAttr;
class CXXDestructorDecl;
class Module;
class CoverageSourceInfo;
class InitSegAttr;
namespace CodeGen {
class CodeGenFunction;
class CodeGenTBAA;
class CGCXXABI;
class CGDebugInfo;
class CGObjCRuntime;
class CGOpenCLRuntime;
class CGOpenMPRuntime;
class CGCUDARuntime;
class CGHLSLRuntime;
class CoverageMappingModuleGen;
class TargetCodeGenInfo;
enum ForDefinition_t : bool {
NotForDefinition = false,
ForDefinition = true
};
struct OrderGlobalInitsOrStermFinalizers {
unsigned int priority;
unsigned int lex_order;
OrderGlobalInitsOrStermFinalizers(unsigned int p, unsigned int l)
: priority(p), lex_order(l) {}
bool operator==(const OrderGlobalInitsOrStermFinalizers &RHS) const {
return priority == RHS.priority && lex_order == RHS.lex_order;
}
bool operator<(const OrderGlobalInitsOrStermFinalizers &RHS) const {
return std::tie(priority, lex_order) <
std::tie(RHS.priority, RHS.lex_order);
}
};
struct ObjCEntrypoints {
ObjCEntrypoints() { memset(this, 0, sizeof(*this)); }
/// void objc_alloc(id);
llvm::FunctionCallee objc_alloc;
/// void objc_allocWithZone(id);
llvm::FunctionCallee objc_allocWithZone;
/// void objc_alloc_init(id);
llvm::FunctionCallee objc_alloc_init;
/// void objc_autoreleasePoolPop(void*);
llvm::FunctionCallee objc_autoreleasePoolPop;
/// void objc_autoreleasePoolPop(void*);
/// Note this method is used when we are using exception handling
llvm::FunctionCallee objc_autoreleasePoolPopInvoke;
/// void *objc_autoreleasePoolPush(void);
llvm::Function *objc_autoreleasePoolPush;
/// id objc_autorelease(id);
llvm::Function *objc_autorelease;
/// id objc_autorelease(id);
/// Note this is the runtime method not the intrinsic.
llvm::FunctionCallee objc_autoreleaseRuntimeFunction;
/// id objc_autoreleaseReturnValue(id);
llvm::Function *objc_autoreleaseReturnValue;
/// void objc_copyWeak(id *dest, id *src);
llvm::Function *objc_copyWeak;
/// void objc_destroyWeak(id*);
llvm::Function *objc_destroyWeak;
/// id objc_initWeak(id*, id);
llvm::Function *objc_initWeak;
/// id objc_loadWeak(id*);
llvm::Function *objc_loadWeak;
/// id objc_loadWeakRetained(id*);
llvm::Function *objc_loadWeakRetained;
/// void objc_moveWeak(id *dest, id *src);
llvm::Function *objc_moveWeak;
/// id objc_retain(id);
llvm::Function *objc_retain;
/// id objc_retain(id);
/// Note this is the runtime method not the intrinsic.
llvm::FunctionCallee objc_retainRuntimeFunction;
/// id objc_retainAutorelease(id);
llvm::Function *objc_retainAutorelease;
/// id objc_retainAutoreleaseReturnValue(id);
llvm::Function *objc_retainAutoreleaseReturnValue;
/// id objc_retainAutoreleasedReturnValue(id);
llvm::Function *objc_retainAutoreleasedReturnValue;
/// id objc_retainBlock(id);
llvm::Function *objc_retainBlock;
/// void objc_release(id);
llvm::Function *objc_release;
/// void objc_release(id);
/// Note this is the runtime method not the intrinsic.
llvm::FunctionCallee objc_releaseRuntimeFunction;
/// void objc_storeStrong(id*, id);
llvm::Function *objc_storeStrong;
/// id objc_storeWeak(id*, id);
llvm::Function *objc_storeWeak;
/// id objc_unsafeClaimAutoreleasedReturnValue(id);
llvm::Function *objc_unsafeClaimAutoreleasedReturnValue;
/// A void(void) inline asm to use to mark that the return value of
/// a call will be immediately retain.
llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
/// void clang.arc.use(...);
llvm::Function *clang_arc_use;
/// void clang.arc.noop.use(...);
llvm::Function *clang_arc_noop_use;
};
/// This class records statistics on instrumentation based profiling.
class InstrProfStats {
uint32_t VisitedInMainFile = 0;
uint32_t MissingInMainFile = 0;
uint32_t Visited = 0;
uint32_t Missing = 0;
uint32_t Mismatched = 0;
public:
InstrProfStats() = default;
/// Record that we've visited a function and whether or not that function was
/// in the main source file.
void addVisited(bool MainFile) {
if (MainFile)
++VisitedInMainFile;
++Visited;
}
/// Record that a function we've visited has no profile data.
void addMissing(bool MainFile) {
if (MainFile)
++MissingInMainFile;
++Missing;
}
/// Record that a function we've visited has mismatched profile data.
void addMismatched(bool MainFile) { ++Mismatched; }
/// Whether or not the stats we've gathered indicate any potential problems.
bool hasDiagnostics() { return Missing || Mismatched; }
/// Report potential problems we've found to \c Diags.
void reportDiagnostics(DiagnosticsEngine &Diags, StringRef MainFile);
};
/// A pair of helper functions for a __block variable.
class BlockByrefHelpers : public llvm::FoldingSetNode {
// MSVC requires this type to be complete in order to process this
// header.
public:
llvm::Constant *CopyHelper;
llvm::Constant *DisposeHelper;
/// The alignment of the field. This is important because
/// different offsets to the field within the byref struct need to
/// have different helper functions.
CharUnits Alignment;
BlockByrefHelpers(CharUnits alignment)
: CopyHelper(nullptr), DisposeHelper(nullptr), Alignment(alignment) {}
BlockByrefHelpers(const BlockByrefHelpers &) = default;
virtual ~BlockByrefHelpers();
void Profile(llvm::FoldingSetNodeID &id) const {
id.AddInteger(Alignment.getQuantity());
profileImpl(id);
}
virtual void profileImpl(llvm::FoldingSetNodeID &id) const = 0;
virtual bool needsCopy() const { return true; }
virtual void emitCopy(CodeGenFunction &CGF, Address dest, Address src) = 0;
virtual bool needsDispose() const { return true; }
virtual void emitDispose(CodeGenFunction &CGF, Address field) = 0;
};
/// This class organizes the cross-function state that is used while generating
/// LLVM code.
class CodeGenModule : public CodeGenTypeCache {
CodeGenModule(const CodeGenModule &) = delete;
void operator=(const CodeGenModule &) = delete;
public:
struct Structor {
Structor()
: Priority(0), LexOrder(~0u), Initializer(nullptr),
AssociatedData(nullptr) {}
Structor(int Priority, unsigned LexOrder, llvm::Constant *Initializer,
llvm::Constant *AssociatedData)
: Priority(Priority), LexOrder(LexOrder), Initializer(Initializer),
AssociatedData(AssociatedData) {}
int Priority;
unsigned LexOrder;
llvm::Constant *Initializer;
llvm::Constant *AssociatedData;
};
typedef std::vector<Structor> CtorList;
private:
ASTContext &Context;
const LangOptions &LangOpts;
IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS; // Only used for debug info.
const HeaderSearchOptions &HeaderSearchOpts; // Only used for debug info.
const PreprocessorOptions &PreprocessorOpts; // Only used for debug info.
const CodeGenOptions &CodeGenOpts;
unsigned NumAutoVarInit = 0;
llvm::Module &TheModule;
DiagnosticsEngine &Diags;
const TargetInfo &Target;
std::unique_ptr<CGCXXABI> ABI;
llvm::LLVMContext &VMContext;
std::string ModuleNameHash;
bool CXX20ModuleInits = false;
std::unique_ptr<CodeGenTBAA> TBAA;
mutable std::unique_ptr<TargetCodeGenInfo> TheTargetCodeGenInfo;
// This should not be moved earlier, since its initialization depends on some
// of the previous reference members being already initialized and also checks
// if TheTargetCodeGenInfo is NULL
CodeGenTypes Types;
/// Holds information about C++ vtables.
CodeGenVTables VTables;
std::unique_ptr<CGObjCRuntime> ObjCRuntime;
std::unique_ptr<CGOpenCLRuntime> OpenCLRuntime;
std::unique_ptr<CGOpenMPRuntime> OpenMPRuntime;
std::unique_ptr<CGCUDARuntime> CUDARuntime;
std::unique_ptr<CGHLSLRuntime> HLSLRuntime;
std::unique_ptr<CGDebugInfo> DebugInfo;
std::unique_ptr<ObjCEntrypoints> ObjCData;
llvm::MDNode *NoObjCARCExceptionsMetadata = nullptr;
std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader;
InstrProfStats PGOStats;
std::unique_ptr<llvm::SanitizerStatReport> SanStats;
// A set of references that have only been seen via a weakref so far. This is
// used to remove the weak of the reference if we ever see a direct reference
// or a definition.
llvm::SmallPtrSet<llvm::GlobalValue*, 10> WeakRefReferences;
/// This contains all the decls which have definitions but/ which are deferred
/// for emission and therefore should only be output if they are actually
/// used. If a decl is in this, then it is known to have not been referenced
/// yet.
llvm::DenseMap<StringRef, GlobalDecl> DeferredDecls;
llvm::StringSet<llvm::BumpPtrAllocator> DeferredResolversToEmit;
/// This is a list of deferred decls which we have seen that *are* actually
/// referenced. These get code generated when the module is done.
std::vector<GlobalDecl> DeferredDeclsToEmit;
void addDeferredDeclToEmit(GlobalDecl GD) {
DeferredDeclsToEmit.emplace_back(GD);
addEmittedDeferredDecl(GD);
}
/// Decls that were DeferredDecls and have now been emitted.
llvm::DenseMap<llvm::StringRef, GlobalDecl> EmittedDeferredDecls;
void addEmittedDeferredDecl(GlobalDecl GD) {
// Reemission is only needed in incremental mode.
if (!Context.getLangOpts().IncrementalExtensions)
return;
// Assume a linkage by default that does not need reemission.
auto L = llvm::GlobalValue::ExternalLinkage;
if (llvm::isa<FunctionDecl>(GD.getDecl()))
L = getFunctionLinkage(GD);
else if (auto *VD = llvm::dyn_cast<VarDecl>(GD.getDecl()))
L = getLLVMLinkageVarDefinition(VD);
if (llvm::GlobalValue::isInternalLinkage(L) ||
llvm::GlobalValue::isLinkOnceLinkage(L) ||
llvm::GlobalValue::isWeakLinkage(L)) {
EmittedDeferredDecls[getMangledName(GD)] = GD;
}
}
/// List of alias we have emitted. Used to make sure that what they point to
/// is defined once we get to the end of the of the translation unit.
std::vector<GlobalDecl> Aliases;
/// List of multiversion functions to be emitted. This list is processed in
/// conjunction with other deferred symbols and is used to ensure that
/// multiversion function resolvers and ifuncs are defined and emitted.
std::vector<GlobalDecl> MultiVersionFuncs;
llvm::MapVector<StringRef, llvm::TrackingVH<llvm::Constant>> Replacements;
/// List of global values to be replaced with something else. Used when we
/// want to replace a GlobalValue but can't identify it by its mangled name
/// anymore (because the name is already taken).
llvm::SmallVector<std::pair<llvm::GlobalValue *, llvm::Constant *>, 8>
GlobalValReplacements;
/// Variables for which we've emitted globals containing their constant
/// values along with the corresponding globals, for opportunistic reuse.
llvm::DenseMap<const VarDecl*, llvm::GlobalVariable*> InitializerConstants;
/// Set of global decls for which we already diagnosed mangled name conflict.
/// Required to not issue a warning (on a mangling conflict) multiple times
/// for the same decl.
llvm::DenseSet<GlobalDecl> DiagnosedConflictingDefinitions;
/// A queue of (optional) vtables to consider emitting.
std::vector<const CXXRecordDecl*> DeferredVTables;
/// A queue of (optional) vtables that may be emitted opportunistically.
std::vector<const CXXRecordDecl *> OpportunisticVTables;
/// List of global values which are required to be present in the object file;
/// bitcast to i8*. This is used for forcing visibility of symbols which may
/// otherwise be optimized out.
std::vector<llvm::WeakTrackingVH> LLVMUsed;
std::vector<llvm::WeakTrackingVH> LLVMCompilerUsed;
/// Store the list of global constructors and their respective priorities to
/// be emitted when the translation unit is complete.
CtorList GlobalCtors;
/// Store the list of global destructors and their respective priorities to be
/// emitted when the translation unit is complete.
CtorList GlobalDtors;
/// An ordered map of canonical GlobalDecls to their mangled names.
llvm::MapVector<GlobalDecl, StringRef> MangledDeclNames;
llvm::StringMap<GlobalDecl, llvm::BumpPtrAllocator> Manglings;
/// Global annotations.
std::vector<llvm::Constant*> Annotations;
// Store deferred function annotations so they can be emitted at the end with
// most up to date ValueDecl that will have all the inherited annotations.
llvm::DenseMap<StringRef, const ValueDecl *> DeferredAnnotations;
/// Map used to get unique annotation strings.
llvm::StringMap<llvm::Constant*> AnnotationStrings;
/// Used for uniquing of annotation arguments.
llvm::DenseMap<unsigned, llvm::Constant *> AnnotationArgs;
llvm::StringMap<llvm::GlobalVariable *> CFConstantStringMap;
llvm::DenseMap<llvm::Constant *, llvm::GlobalVariable *> ConstantStringMap;
llvm::DenseMap<const UnnamedGlobalConstantDecl *, llvm::GlobalVariable *>
UnnamedGlobalConstantDeclMap;
llvm::DenseMap<const Decl*, llvm::Constant *> StaticLocalDeclMap;
llvm::DenseMap<const Decl*, llvm::GlobalVariable*> StaticLocalDeclGuardMap;
llvm::DenseMap<const Expr*, llvm::Constant *> MaterializedGlobalTemporaryMap;
llvm::DenseMap<QualType, llvm::Constant *> AtomicSetterHelperFnMap;
llvm::DenseMap<QualType, llvm::Constant *> AtomicGetterHelperFnMap;
/// Map used to get unique type descriptor constants for sanitizers.
llvm::DenseMap<QualType, llvm::Constant *> TypeDescriptorMap;
/// Map used to track internal linkage functions declared within
/// extern "C" regions.
typedef llvm::MapVector<IdentifierInfo *,
llvm::GlobalValue *> StaticExternCMap;
StaticExternCMap StaticExternCValues;
/// thread_local variables defined or used in this TU.
std::vector<const VarDecl *> CXXThreadLocals;
/// thread_local variables with initializers that need to run
/// before any thread_local variable in this TU is odr-used.
std::vector<llvm::Function *> CXXThreadLocalInits;
std::vector<const VarDecl *> CXXThreadLocalInitVars;
/// Global variables with initializers that need to run before main.
std::vector<llvm::Function *> CXXGlobalInits;
/// When a C++ decl with an initializer is deferred, null is
/// appended to CXXGlobalInits, and the index of that null is placed
/// here so that the initializer will be performed in the correct
/// order. Once the decl is emitted, the index is replaced with ~0U to ensure
/// that we don't re-emit the initializer.
llvm::DenseMap<const Decl*, unsigned> DelayedCXXInitPosition;
typedef std::pair<OrderGlobalInitsOrStermFinalizers, llvm::Function *>
GlobalInitData;
struct GlobalInitPriorityCmp {
bool operator()(const GlobalInitData &LHS,
const GlobalInitData &RHS) const {
return LHS.first.priority < RHS.first.priority;
}
};
/// Global variables with initializers whose order of initialization is set by
/// init_priority attribute.
SmallVector<GlobalInitData, 8> PrioritizedCXXGlobalInits;
/// Global destructor functions and arguments that need to run on termination.
/// When UseSinitAndSterm is set, it instead contains sterm finalizer
/// functions, which also run on unloading a shared library.
typedef std::tuple<llvm::FunctionType *, llvm::WeakTrackingVH,
llvm::Constant *>
CXXGlobalDtorsOrStermFinalizer_t;
SmallVector<CXXGlobalDtorsOrStermFinalizer_t, 8>
CXXGlobalDtorsOrStermFinalizers;
typedef std::pair<OrderGlobalInitsOrStermFinalizers, llvm::Function *>
StermFinalizerData;
struct StermFinalizerPriorityCmp {
bool operator()(const StermFinalizerData &LHS,
const StermFinalizerData &RHS) const {
return LHS.first.priority < RHS.first.priority;
}
};
/// Global variables with sterm finalizers whose order of initialization is
/// set by init_priority attribute.
SmallVector<StermFinalizerData, 8> PrioritizedCXXStermFinalizers;
/// The complete set of modules that has been imported.
llvm::SetVector<clang::Module *> ImportedModules;
/// The set of modules for which the module initializers
/// have been emitted.
llvm::SmallPtrSet<clang::Module *, 16> EmittedModuleInitializers;
/// A vector of metadata strings for linker options.
SmallVector<llvm::MDNode *, 16> LinkerOptionsMetadata;
/// A vector of metadata strings for dependent libraries for ELF.
SmallVector<llvm::MDNode *, 16> ELFDependentLibraries;
/// @name Cache for Objective-C runtime types
/// @{
/// Cached reference to the class for constant strings. This value has type
/// int * but is actually an Obj-C class pointer.
llvm::WeakTrackingVH CFConstantStringClassRef;
/// The type used to describe the state of a fast enumeration in
/// Objective-C's for..in loop.
QualType ObjCFastEnumerationStateType;
/// @}
/// Lazily create the Objective-C runtime
void createObjCRuntime();
void createOpenCLRuntime();
void createOpenMPRuntime();
void createCUDARuntime();
void createHLSLRuntime();
bool isTriviallyRecursive(const FunctionDecl *F);
bool shouldEmitFunction(GlobalDecl GD);
bool shouldOpportunisticallyEmitVTables();
/// Map used to be sure we don't emit the same CompoundLiteral twice.
llvm::DenseMap<const CompoundLiteralExpr *, llvm::GlobalVariable *>
EmittedCompoundLiterals;
/// Map of the global blocks we've emitted, so that we don't have to re-emit
/// them if the constexpr evaluator gets aggressive.
llvm::DenseMap<const BlockExpr *, llvm::Constant *> EmittedGlobalBlocks;
/// @name Cache for Blocks Runtime Globals
/// @{
llvm::Constant *NSConcreteGlobalBlock = nullptr;
llvm::Constant *NSConcreteStackBlock = nullptr;
llvm::FunctionCallee BlockObjectAssign = nullptr;
llvm::FunctionCallee BlockObjectDispose = nullptr;
llvm::Type *BlockDescriptorType = nullptr;
llvm::Type *GenericBlockLiteralType = nullptr;
struct {
int GlobalUniqueCount;
} Block;
GlobalDecl initializedGlobalDecl;
/// @}
/// void @llvm.lifetime.start(i64 %size, i8* nocapture <ptr>)
llvm::Function *LifetimeStartFn = nullptr;
/// void @llvm.lifetime.end(i64 %size, i8* nocapture <ptr>)
llvm::Function *LifetimeEndFn = nullptr;
std::unique_ptr<SanitizerMetadata> SanitizerMD;
llvm::MapVector<const Decl *, bool> DeferredEmptyCoverageMappingDecls;
std::unique_ptr<CoverageMappingModuleGen> CoverageMapping;
/// Mapping from canonical types to their metadata identifiers. We need to
/// maintain this mapping because identifiers may be formed from distinct
/// MDNodes.
typedef llvm::DenseMap<QualType, llvm::Metadata *> MetadataTypeMap;
MetadataTypeMap MetadataIdMap;
MetadataTypeMap VirtualMetadataIdMap;
MetadataTypeMap GeneralizedMetadataIdMap;
// Helps squashing blocks of TopLevelStmtDecl into a single llvm::Function
// when used with -fincremental-extensions.
std::pair<std::unique_ptr<CodeGenFunction>, const TopLevelStmtDecl *>
GlobalTopLevelStmtBlockInFlight;
public:
CodeGenModule(ASTContext &C, IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS,
const HeaderSearchOptions &headersearchopts,
const PreprocessorOptions &ppopts,
const CodeGenOptions &CodeGenOpts, llvm::Module &M,
DiagnosticsEngine &Diags,
CoverageSourceInfo *CoverageInfo = nullptr);
~CodeGenModule();
void clear();
/// Finalize LLVM code generation.
void Release();
/// Return true if we should emit location information for expressions.
bool getExpressionLocationsEnabled() const;
/// Return a reference to the configured Objective-C runtime.
CGObjCRuntime &getObjCRuntime() {
if (!ObjCRuntime) createObjCRuntime();
return *ObjCRuntime;
}
/// Return true iff an Objective-C runtime has been configured.
bool hasObjCRuntime() { return !!ObjCRuntime; }
const std::string &getModuleNameHash() const { return ModuleNameHash; }
/// Return a reference to the configured OpenCL runtime.
CGOpenCLRuntime &getOpenCLRuntime() {
assert(OpenCLRuntime != nullptr);
return *OpenCLRuntime;
}
/// Return a reference to the configured OpenMP runtime.
CGOpenMPRuntime &getOpenMPRuntime() {
assert(OpenMPRuntime != nullptr);
return *OpenMPRuntime;
}
/// Return a reference to the configured CUDA runtime.
CGCUDARuntime &getCUDARuntime() {
assert(CUDARuntime != nullptr);
return *CUDARuntime;
}
/// Return a reference to the configured HLSL runtime.
CGHLSLRuntime &getHLSLRuntime() {
assert(HLSLRuntime != nullptr);
return *HLSLRuntime;
}
ObjCEntrypoints &getObjCEntrypoints() const {
assert(ObjCData != nullptr);
return *ObjCData;
}
// Version checking functions, used to implement ObjC's @available:
// i32 @__isOSVersionAtLeast(i32, i32, i32)
llvm::FunctionCallee IsOSVersionAtLeastFn = nullptr;
// i32 @__isPlatformVersionAtLeast(i32, i32, i32, i32)
llvm::FunctionCallee IsPlatformVersionAtLeastFn = nullptr;
InstrProfStats &getPGOStats() { return PGOStats; }
llvm::IndexedInstrProfReader *getPGOReader() const { return PGOReader.get(); }
CoverageMappingModuleGen *getCoverageMapping() const {
return CoverageMapping.get();
}
llvm::Constant *getStaticLocalDeclAddress(const VarDecl *D) {
return StaticLocalDeclMap[D];
}
void setStaticLocalDeclAddress(const VarDecl *D,
llvm::Constant *C) {
StaticLocalDeclMap[D] = C;
}
llvm::Constant *
getOrCreateStaticVarDecl(const VarDecl &D,
llvm::GlobalValue::LinkageTypes Linkage);
llvm::GlobalVariable *getStaticLocalDeclGuardAddress(const VarDecl *D) {
return StaticLocalDeclGuardMap[D];
}
void setStaticLocalDeclGuardAddress(const VarDecl *D,
llvm::GlobalVariable *C) {
StaticLocalDeclGuardMap[D] = C;
}
Address createUnnamedGlobalFrom(const VarDecl &D, llvm::Constant *Constant,
CharUnits Align);
bool lookupRepresentativeDecl(StringRef MangledName,
GlobalDecl &Result) const;
llvm::Constant *getAtomicSetterHelperFnMap(QualType Ty) {
return AtomicSetterHelperFnMap[Ty];
}
void setAtomicSetterHelperFnMap(QualType Ty,
llvm::Constant *Fn) {
AtomicSetterHelperFnMap[Ty] = Fn;
}
llvm::Constant *getAtomicGetterHelperFnMap(QualType Ty) {
return AtomicGetterHelperFnMap[Ty];
}
void setAtomicGetterHelperFnMap(QualType Ty,
llvm::Constant *Fn) {
AtomicGetterHelperFnMap[Ty] = Fn;
}
llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
return TypeDescriptorMap[Ty];
}
void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
TypeDescriptorMap[Ty] = C;
}
CGDebugInfo *getModuleDebugInfo() { return DebugInfo.get(); }
llvm::MDNode *getNoObjCARCExceptionsMetadata() {
if (!NoObjCARCExceptionsMetadata)
NoObjCARCExceptionsMetadata =
llvm::MDNode::get(getLLVMContext(), std::nullopt);
return NoObjCARCExceptionsMetadata;
}
ASTContext &getContext() const { return Context; }
const LangOptions &getLangOpts() const { return LangOpts; }
const IntrusiveRefCntPtr<llvm::vfs::FileSystem> &getFileSystem() const {
return FS;
}
const HeaderSearchOptions &getHeaderSearchOpts()
const { return HeaderSearchOpts; }
const PreprocessorOptions &getPreprocessorOpts()
const { return PreprocessorOpts; }
const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
llvm::Module &getModule() const { return TheModule; }
DiagnosticsEngine &getDiags() const { return Diags; }
const llvm::DataLayout &getDataLayout() const {
return TheModule.getDataLayout();
}
const TargetInfo &getTarget() const { return Target; }
const llvm::Triple &getTriple() const { return Target.getTriple(); }
bool supportsCOMDAT() const;
void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO);
CGCXXABI &getCXXABI() const { return *ABI; }
llvm::LLVMContext &getLLVMContext() { return VMContext; }
bool shouldUseTBAA() const { return TBAA != nullptr; }
const TargetCodeGenInfo &getTargetCodeGenInfo();
CodeGenTypes &getTypes() { return Types; }
CodeGenVTables &getVTables() { return VTables; }
ItaniumVTableContext &getItaniumVTableContext() {
return VTables.getItaniumVTableContext();
}
const ItaniumVTableContext &getItaniumVTableContext() const {
return VTables.getItaniumVTableContext();
}
MicrosoftVTableContext &getMicrosoftVTableContext() {
return VTables.getMicrosoftVTableContext();
}
CtorList &getGlobalCtors() { return GlobalCtors; }
CtorList &getGlobalDtors() { return GlobalDtors; }
/// getTBAATypeInfo - Get metadata used to describe accesses to objects of
/// the given type.
llvm::MDNode *getTBAATypeInfo(QualType QTy);
/// getTBAAAccessInfo - Get TBAA information that describes an access to
/// an object of the given type.
TBAAAccessInfo getTBAAAccessInfo(QualType AccessType);
/// getTBAAVTablePtrAccessInfo - Get the TBAA information that describes an
/// access to a virtual table pointer.
TBAAAccessInfo getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType);
llvm::MDNode *getTBAAStructInfo(QualType QTy);
/// getTBAABaseTypeInfo - Get metadata that describes the given base access
/// type. Return null if the type is not suitable for use in TBAA access tags.
llvm::MDNode *getTBAABaseTypeInfo(QualType QTy);
/// getTBAAAccessTagInfo - Get TBAA tag for a given memory access.
llvm::MDNode *getTBAAAccessTagInfo(TBAAAccessInfo Info);
/// mergeTBAAInfoForCast - Get merged TBAA information for the purposes of
/// type casts.
TBAAAccessInfo mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo,
TBAAAccessInfo TargetInfo);
/// mergeTBAAInfoForConditionalOperator - Get merged TBAA information for the
/// purposes of conditional operator.
TBAAAccessInfo mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA,
TBAAAccessInfo InfoB);
/// mergeTBAAInfoForMemoryTransfer - Get merged TBAA information for the
/// purposes of memory transfer calls.
TBAAAccessInfo mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
TBAAAccessInfo SrcInfo);
/// getTBAAInfoForSubobject - Get TBAA information for an access with a given
/// base lvalue.
TBAAAccessInfo getTBAAInfoForSubobject(LValue Base, QualType AccessType) {
if (Base.getTBAAInfo().isMayAlias())
return TBAAAccessInfo::getMayAliasInfo();
return getTBAAAccessInfo(AccessType);
}
bool isPaddedAtomicType(QualType type);
bool isPaddedAtomicType(const AtomicType *type);
/// DecorateInstructionWithTBAA - Decorate the instruction with a TBAA tag.
void DecorateInstructionWithTBAA(llvm::Instruction *Inst,
TBAAAccessInfo TBAAInfo);
/// Adds !invariant.barrier !tag to instruction
void DecorateInstructionWithInvariantGroup(llvm::Instruction *I,
const CXXRecordDecl *RD);
/// Emit the given number of characters as a value of type size_t.
llvm::ConstantInt *getSize(CharUnits numChars);
/// Set the visibility for the given LLVM GlobalValue.
void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const;
void setDSOLocal(llvm::GlobalValue *GV) const;
bool shouldMapVisibilityToDLLExport(const NamedDecl *D) const {
return getLangOpts().hasDefaultVisibilityExportMapping() && D &&
(D->getLinkageAndVisibility().getVisibility() ==
DefaultVisibility) &&
(getLangOpts().isAllDefaultVisibilityExportMapping() ||
(getLangOpts().isExplicitDefaultVisibilityExportMapping() &&
D->getLinkageAndVisibility().isVisibilityExplicit()));
}
void setDLLImportDLLExport(llvm::GlobalValue *GV, GlobalDecl D) const;
void setDLLImportDLLExport(llvm::GlobalValue *GV, const NamedDecl *D) const;
/// Set visibility, dllimport/dllexport and dso_local.
/// This must be called after dllimport/dllexport is set.
void setGVProperties(llvm::GlobalValue *GV, GlobalDecl GD) const;
void setGVProperties(llvm::GlobalValue *GV, const NamedDecl *D) const;
void setGVPropertiesAux(llvm::GlobalValue *GV, const NamedDecl *D) const;
/// Set the TLS mode for the given LLVM GlobalValue for the thread-local
/// variable declaration D.
void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const;
/// Get LLVM TLS mode from CodeGenOptions.
llvm::GlobalVariable::ThreadLocalMode GetDefaultLLVMTLSModel() const;
static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
switch (V) {
case DefaultVisibility: return llvm::GlobalValue::DefaultVisibility;
case HiddenVisibility: return llvm::GlobalValue::HiddenVisibility;
case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
}
llvm_unreachable("unknown visibility!");
}
llvm::Constant *GetAddrOfGlobal(GlobalDecl GD,
ForDefinition_t IsForDefinition
= NotForDefinition);
/// Will return a global variable of the given type. If a variable with a
/// different type already exists then a new variable with the right type
/// will be created and all uses of the old variable will be replaced with a
/// bitcast to the new variable.
llvm::GlobalVariable *
CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
llvm::GlobalValue::LinkageTypes Linkage,
llvm::Align Alignment);
llvm::Function *CreateGlobalInitOrCleanUpFunction(
llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI,
SourceLocation Loc = SourceLocation(), bool TLS = false,
llvm::GlobalVariable::LinkageTypes Linkage =
llvm::GlobalVariable::InternalLinkage);
/// Return the AST address space of the underlying global variable for D, as
/// determined by its declaration. Normally this is the same as the address
/// space of D's type, but in CUDA, address spaces are associated with
/// declarations, not types. If D is nullptr, return the default address
/// space for global variable.
///
/// For languages without explicit address spaces, if D has default address
/// space, target-specific global or constant address space may be returned.
LangAS GetGlobalVarAddressSpace(const VarDecl *D);
/// Return the AST address space of constant literal, which is used to emit
/// the constant literal as global variable in LLVM IR.
/// Note: This is not necessarily the address space of the constant literal
/// in AST. For address space agnostic language, e.g. C++, constant literal
/// in AST is always in default address space.
LangAS GetGlobalConstantAddressSpace() const;
/// Return the llvm::Constant for the address of the given global variable.
/// If Ty is non-null and if the global doesn't exist, then it will be created
/// with the specified type instead of whatever the normal requested type
/// would be. If IsForDefinition is true, it is guaranteed that an actual
/// global with type Ty will be returned, not conversion of a variable with
/// the same mangled name but some other type.
llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
llvm::Type *Ty = nullptr,
ForDefinition_t IsForDefinition
= NotForDefinition);
/// Return the address of the given function. If Ty is non-null, then this
/// function will use the specified type if it has to create it.
llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = nullptr,
bool ForVTable = false,
bool DontDefer = false,
ForDefinition_t IsForDefinition
= NotForDefinition);
// Return the function body address of the given function.
llvm::Constant *GetFunctionStart(const ValueDecl *Decl);
// Return whether RTTI information should be emitted for this target.
bool shouldEmitRTTI(bool ForEH = false) {
return (ForEH || getLangOpts().RTTI) && !getLangOpts().CUDAIsDevice &&
!(getLangOpts().OpenMP && getLangOpts().OpenMPIsTargetDevice &&
getTriple().isNVPTX());
}
/// Get the address of the RTTI descriptor for the given type.
llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
/// Get the address of a GUID.
ConstantAddress GetAddrOfMSGuidDecl(const MSGuidDecl *GD);
/// Get the address of a UnnamedGlobalConstant
ConstantAddress
GetAddrOfUnnamedGlobalConstantDecl(const UnnamedGlobalConstantDecl *GCD);
/// Get the address of a template parameter object.
ConstantAddress
GetAddrOfTemplateParamObject(const TemplateParamObjectDecl *TPO);
/// Get the address of the thunk for the given global decl.
llvm::Constant *GetAddrOfThunk(StringRef Name, llvm::Type *FnTy,
GlobalDecl GD);
/// Get a reference to the target of VD.
ConstantAddress GetWeakRefReference(const ValueDecl *VD);
/// Returns the assumed alignment of an opaque pointer to the given class.
CharUnits getClassPointerAlignment(const CXXRecordDecl *CD);
/// Returns the minimum object size for an object of the given class type
/// (or a class derived from it).
CharUnits getMinimumClassObjectSize(const CXXRecordDecl *CD);
/// Returns the minimum object size for an object of the given type.
CharUnits getMinimumObjectSize(QualType Ty) {
if (CXXRecordDecl *RD = Ty->getAsCXXRecordDecl())
return getMinimumClassObjectSize(RD);
return getContext().getTypeSizeInChars(Ty);
}
/// Returns the assumed alignment of a virtual base of a class.
CharUnits getVBaseAlignment(CharUnits DerivedAlign,
const CXXRecordDecl *Derived,
const CXXRecordDecl *VBase);
/// Given a class pointer with an actual known alignment, and the
/// expected alignment of an object at a dynamic offset w.r.t that
/// pointer, return the alignment to assume at the offset.
CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign,
const CXXRecordDecl *Class,
CharUnits ExpectedTargetAlign);
CharUnits
computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass,
CastExpr::path_const_iterator Start,
CastExpr::path_const_iterator End);
/// Returns the offset from a derived class to a class. Returns null if the
/// offset is 0.
llvm::Constant *
GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
CastExpr::path_const_iterator PathBegin,
CastExpr::path_const_iterator PathEnd);
llvm::FoldingSet<BlockByrefHelpers> ByrefHelpersCache;
/// Fetches the global unique block count.
int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
/// Fetches the type of a generic block descriptor.
llvm::Type *getBlockDescriptorType();
/// The type of a generic block literal.
llvm::Type *getGenericBlockLiteralType();
/// Gets the address of a block which requires no captures.
llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, StringRef Name);
/// Returns the address of a block which requires no caputres, or null if
/// we've yet to emit the block for BE.
llvm::Constant *getAddrOfGlobalBlockIfEmitted(const BlockExpr *BE) {
return EmittedGlobalBlocks.lookup(BE);
}
/// Notes that BE's global block is available via Addr. Asserts that BE
/// isn't already emitted.
void setAddrOfGlobalBlock(const BlockExpr *BE, llvm::Constant *Addr);
/// Return a pointer to a constant CFString object for the given string.
ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal);
/// Return a constant array for the given string.
llvm::Constant *GetConstantArrayFromStringLiteral(const StringLiteral *E);
/// Return a pointer to a constant array for the given string literal.
ConstantAddress
GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
StringRef Name = ".str");
/// Return a pointer to a constant array for the given ObjCEncodeExpr node.
ConstantAddress
GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
/// Returns a pointer to a character array containing the literal and a
/// terminating '\0' character. The result has pointer to array type.
///
/// \param GlobalName If provided, the name to use for the global (if one is
/// created).
ConstantAddress
GetAddrOfConstantCString(const std::string &Str,
const char *GlobalName = nullptr);
/// Returns a pointer to a constant global variable for the given file-scope
/// compound literal expression.
ConstantAddress GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
/// If it's been emitted already, returns the GlobalVariable corresponding to
/// a compound literal. Otherwise, returns null.
llvm::GlobalVariable *
getAddrOfConstantCompoundLiteralIfEmitted(const CompoundLiteralExpr *E);
/// Notes that CLE's GlobalVariable is GV. Asserts that CLE isn't already
/// emitted.
void setAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *CLE,
llvm::GlobalVariable *GV);
/// Returns a pointer to a global variable representing a temporary
/// with static or thread storage duration.
ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E,
const Expr *Inner);
/// Retrieve the record type that describes the state of an
/// Objective-C fast enumeration loop (for..in).
QualType getObjCFastEnumerationStateType();
// Produce code for this constructor/destructor. This method doesn't try
// to apply any ABI rules about which other constructors/destructors
// are needed or if they are alias to each other.
llvm::Function *codegenCXXStructor(GlobalDecl GD);
/// Return the address of the constructor/destructor of the given type.
llvm::Constant *
getAddrOfCXXStructor(GlobalDecl GD, const CGFunctionInfo *FnInfo = nullptr,
llvm::FunctionType *FnType = nullptr,
bool DontDefer = false,
ForDefinition_t IsForDefinition = NotForDefinition) {
return cast<llvm::Constant>(getAddrAndTypeOfCXXStructor(GD, FnInfo, FnType,
DontDefer,
IsForDefinition)
.getCallee());
}
llvm::FunctionCallee getAddrAndTypeOfCXXStructor(
GlobalDecl GD, const CGFunctionInfo *FnInfo = nullptr,
llvm::FunctionType *FnType = nullptr, bool DontDefer = false,
ForDefinition_t IsForDefinition = NotForDefinition);
/// Given a builtin id for a function like "__builtin_fabsf", return a
/// Function* for "fabsf".
llvm::Constant *getBuiltinLibFunction(const FunctionDecl *FD,
unsigned BuiltinID);
llvm::Function *getIntrinsic(unsigned IID,
ArrayRef<llvm::Type *> Tys = std::nullopt);
/// Emit code for a single top level declaration.
void EmitTopLevelDecl(Decl *D);
/// Stored a deferred empty coverage mapping for an unused
/// and thus uninstrumented top level declaration.
void AddDeferredUnusedCoverageMapping(Decl *D);
/// Remove the deferred empty coverage mapping as this
/// declaration is actually instrumented.
void ClearUnusedCoverageMapping(const Decl *D);
/// Emit all the deferred coverage mappings
/// for the uninstrumented functions.
void EmitDeferredUnusedCoverageMappings();
/// Emit an alias for "main" if it has no arguments (needed for wasm).
void EmitMainVoidAlias();
/// Tell the consumer that this variable has been instantiated.
void HandleCXXStaticMemberVarInstantiation(VarDecl *VD);
/// If the declaration has internal linkage but is inside an
/// extern "C" linkage specification, prepare to emit an alias for it
/// to the expected name.
template<typename SomeDecl>
void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV);
/// Add a global to a list to be added to the llvm.used metadata.
void addUsedGlobal(llvm::GlobalValue *GV);
/// Add a global to a list to be added to the llvm.compiler.used metadata.
void addCompilerUsedGlobal(llvm::GlobalValue *GV);
/// Add a global to a list to be added to the llvm.compiler.used metadata.
void addUsedOrCompilerUsedGlobal(llvm::GlobalValue *GV);
/// Add a destructor and object to add to the C++ global destructor function.
void AddCXXDtorEntry(llvm::FunctionCallee DtorFn, llvm::Constant *Object) {
CXXGlobalDtorsOrStermFinalizers.emplace_back(DtorFn.getFunctionType(),
DtorFn.getCallee(), Object);
}
/// Add an sterm finalizer to the C++ global cleanup function.
void AddCXXStermFinalizerEntry(llvm::FunctionCallee DtorFn) {
CXXGlobalDtorsOrStermFinalizers.emplace_back(DtorFn.getFunctionType(),
DtorFn.getCallee(), nullptr);
}
/// Add an sterm finalizer to its own llvm.global_dtors entry.
void AddCXXStermFinalizerToGlobalDtor(llvm::Function *StermFinalizer,
int Priority) {
AddGlobalDtor(StermFinalizer, Priority);
}
void AddCXXPrioritizedStermFinalizerEntry(llvm::Function *StermFinalizer,
int Priority) {
OrderGlobalInitsOrStermFinalizers Key(Priority,
PrioritizedCXXStermFinalizers.size());
PrioritizedCXXStermFinalizers.push_back(
std::make_pair(Key, StermFinalizer));
}
/// Create or return a runtime function declaration with the specified type
/// and name. If \p AssumeConvergent is true, the call will have the
/// convergent attribute added.
llvm::FunctionCallee
CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
bool Local = false, bool AssumeConvergent = false);
/// Create a new runtime global variable with the specified type and name.
llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
StringRef Name);
///@name Custom Blocks Runtime Interfaces
///@{
llvm::Constant *getNSConcreteGlobalBlock();
llvm::Constant *getNSConcreteStackBlock();
llvm::FunctionCallee getBlockObjectAssign();
llvm::FunctionCallee getBlockObjectDispose();
///@}
llvm::Function *getLLVMLifetimeStartFn();
llvm::Function *getLLVMLifetimeEndFn();
// Make sure that this type is translated.
void UpdateCompletedType(const TagDecl *TD);
llvm::Constant *getMemberPointerConstant(const UnaryOperator *e);
/// Emit type info if type of an expression is a variably modified
/// type. Also emit proper debug info for cast types.
void EmitExplicitCastExprType(const ExplicitCastExpr *E,
CodeGenFunction *CGF = nullptr);
/// Return the result of value-initializing the given type, i.e. a null
/// expression of the given type. This is usually, but not always, an LLVM
/// null constant.
llvm::Constant *EmitNullConstant(QualType T);
/// Return a null constant appropriate for zero-initializing a base class with
/// the given type. This is usually, but not always, an LLVM null constant.
llvm::Constant *EmitNullConstantForBase(const CXXRecordDecl *Record);
/// Emit a general error that something can't be done.
void Error(SourceLocation loc, StringRef error);
/// Print out an error that codegen doesn't support the specified stmt yet.
void ErrorUnsupported(const Stmt *S, const char *Type);
/// Print out an error that codegen doesn't support the specified decl yet.
void ErrorUnsupported(const Decl *D, const char *Type);
/// Set the attributes on the LLVM function for the given decl and function
/// info. This applies attributes necessary for handling the ABI as well as
/// user specified attributes like section.
void SetInternalFunctionAttributes(GlobalDecl GD, llvm::Function *F,
const CGFunctionInfo &FI);
/// Set the LLVM function attributes (sext, zext, etc).
void SetLLVMFunctionAttributes(GlobalDecl GD, const CGFunctionInfo &Info,
llvm::Function *F, bool IsThunk);
/// Set the LLVM function attributes which only apply to a function
/// definition.
void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
/// Set the LLVM function attributes that represent floating point
/// environment.
void setLLVMFunctionFEnvAttributes(const FunctionDecl *D, llvm::Function *F);
/// Return true iff the given type uses 'sret' when used as a return type.
bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
/// Return true iff the given type uses an argument slot when 'sret' is used
/// as a return type.
bool ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI);
/// Return true iff the given type uses 'fpret' when used as a return type.
bool ReturnTypeUsesFPRet(QualType ResultType);
/// Return true iff the given type uses 'fp2ret' when used as a return type.
bool ReturnTypeUsesFP2Ret(QualType ResultType);
/// Get the LLVM attributes and calling convention to use for a particular
/// function type.
///
/// \param Name - The function name.
/// \param Info - The function type information.
/// \param CalleeInfo - The callee information these attributes are being
/// constructed for. If valid, the attributes applied to this decl may
/// contribute to the function attributes and calling convention.
/// \param Attrs [out] - On return, the attribute list to use.
/// \param CallingConv [out] - On return, the LLVM calling convention to use.
void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
CGCalleeInfo CalleeInfo,
llvm::AttributeList &Attrs, unsigned &CallingConv,
bool AttrOnCallSite, bool IsThunk);
/// Adjust Memory attribute to ensure that the BE gets the right attribute
// in order to generate the library call or the intrinsic for the function
// name 'Name'.
void AdjustMemoryAttribute(StringRef Name, CGCalleeInfo CalleeInfo,
llvm::AttributeList &Attrs);
/// Like the overload taking a `Function &`, but intended specifically
/// for frontends that want to build on Clang's target-configuration logic.
void addDefaultFunctionDefinitionAttributes(llvm::AttrBuilder &attrs);
StringRef getMangledName(GlobalDecl GD);
StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
const GlobalDecl getMangledNameDecl(StringRef);
void EmitTentativeDefinition(const VarDecl *D);
void EmitExternalDeclaration(const VarDecl *D);
void EmitVTable(CXXRecordDecl *Class);
void RefreshTypeCacheForClass(const CXXRecordDecl *Class);
/// Appends Opts to the "llvm.linker.options" metadata value.
void AppendLinkerOptions(StringRef Opts);
/// Appends a detect mismatch command to the linker options.
void AddDetectMismatch(StringRef Name, StringRef Value);
/// Appends a dependent lib to the appropriate metadata value.
void AddDependentLib(StringRef Lib);
llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD);
void setFunctionLinkage(GlobalDecl GD, llvm::Function *F) {
F->setLinkage(getFunctionLinkage(GD));
}
/// Return the appropriate linkage for the vtable, VTT, and type information
/// of the given class.
llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
/// Return the store size, in character units, of the given LLVM type.
CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const;
/// Returns LLVM linkage for a declarator.
llvm::GlobalValue::LinkageTypes
getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage);
/// Returns LLVM linkage for a declarator.
llvm::GlobalValue::LinkageTypes
getLLVMLinkageVarDefinition(const VarDecl *VD);
/// Emit all the global annotations.
void EmitGlobalAnnotations();
/// Emit an annotation string.
llvm::Constant *EmitAnnotationString(StringRef Str);
/// Emit the annotation's translation unit.
llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
/// Emit the annotation line number.
llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
/// Emit additional args of the annotation.
llvm::Constant *EmitAnnotationArgs(const AnnotateAttr *Attr);
/// Generate the llvm::ConstantStruct which contains the annotation
/// information for a given GlobalValue. The annotation struct is
/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
/// GlobalValue being annotated. The second field is the constant string
/// created from the AnnotateAttr's annotation. The third field is a constant
/// string containing the name of the translation unit. The fourth field is
/// the line number in the file of the annotated value declaration.
llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
const AnnotateAttr *AA,
SourceLocation L);
/// Add global annotations that are set on D, for the global GV. Those
/// annotations are emitted during finalization of the LLVM code.
void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
bool isInNoSanitizeList(SanitizerMask Kind, llvm::Function *Fn,
SourceLocation Loc) const;
bool isInNoSanitizeList(SanitizerMask Kind, llvm::GlobalVariable *GV,
SourceLocation Loc, QualType Ty,
StringRef Category = StringRef()) const;
/// Imbue XRay attributes to a function, applying the always/never attribute
/// lists in the process. Returns true if we did imbue attributes this way,
/// false otherwise.
bool imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
StringRef Category = StringRef()) const;
/// \returns true if \p Fn at \p Loc should be excluded from profile
/// instrumentation by the SCL passed by \p -fprofile-list.
ProfileList::ExclusionType
isFunctionBlockedByProfileList(llvm::Function *Fn, SourceLocation Loc) const;
/// \returns true if \p Fn at \p Loc should be excluded from profile
/// instrumentation.
ProfileList::ExclusionType
isFunctionBlockedFromProfileInstr(llvm::Function *Fn,
SourceLocation Loc) const;
SanitizerMetadata *getSanitizerMetadata() {
return SanitizerMD.get();
}
void addDeferredVTable(const CXXRecordDecl *RD) {
DeferredVTables.push_back(RD);
}
/// Emit code for a single global function or var decl. Forward declarations
/// are emitted lazily.
void EmitGlobal(GlobalDecl D);
bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
llvm::GlobalValue *GetGlobalValue(StringRef Ref);
/// Set attributes which are common to any form of a global definition (alias,
/// Objective-C method, function, global variable).
///
/// NOTE: This should only be called for definitions.
void SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV);
void addReplacement(StringRef Name, llvm::Constant *C);
void addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C);
/// Emit a code for threadprivate directive.
/// \param D Threadprivate declaration.
void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D);
/// Emit a code for declare reduction construct.
void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
CodeGenFunction *CGF = nullptr);
/// Emit a code for declare mapper construct.
void EmitOMPDeclareMapper(const OMPDeclareMapperDecl *D,
CodeGenFunction *CGF = nullptr);
/// Emit a code for requires directive.
/// \param D Requires declaration
void EmitOMPRequiresDecl(const OMPRequiresDecl *D);
/// Emit a code for the allocate directive.
/// \param D The allocate declaration
void EmitOMPAllocateDecl(const OMPAllocateDecl *D);
/// Return the alignment specified in an allocate directive, if present.
std::optional<CharUnits> getOMPAllocateAlignment(const VarDecl *VD);
/// Returns whether the given record has hidden LTO visibility and therefore
/// may participate in (single-module) CFI and whole-program vtable
/// optimization.
bool HasHiddenLTOVisibility(const CXXRecordDecl *RD);
/// Returns whether the given record has public LTO visibility (regardless of
/// -lto-whole-program-visibility) and therefore may not participate in
/// (single-module) CFI and whole-program vtable optimization.
bool AlwaysHasLTOVisibilityPublic(const CXXRecordDecl *RD);
/// Returns the vcall visibility of the given type. This is the scope in which
/// a virtual function call could be made which ends up being dispatched to a
/// member function of this class. This scope can be wider than the visibility
/// of the class itself when the class has a more-visible dynamic base class.
/// The client should pass in an empty Visited set, which is used to prevent
/// redundant recursive processing.
llvm::GlobalObject::VCallVisibility
GetVCallVisibilityLevel(const CXXRecordDecl *RD,
llvm::DenseSet<const CXXRecordDecl *> &Visited);
/// Emit type metadata for the given vtable using the given layout.
void EmitVTableTypeMetadata(const CXXRecordDecl *RD,
llvm::GlobalVariable *VTable,
const VTableLayout &VTLayout);
llvm::Type *getVTableComponentType() const;
/// Generate a cross-DSO type identifier for MD.
llvm::ConstantInt *CreateCrossDsoCfiTypeId(llvm::Metadata *MD);
/// Generate a KCFI type identifier for T.
llvm::ConstantInt *CreateKCFITypeId(QualType T);
/// Create a metadata identifier for the given type. This may either be an
/// MDString (for external identifiers) or a distinct unnamed MDNode (for
/// internal identifiers).
llvm::Metadata *CreateMetadataIdentifierForType(QualType T);
/// Create a metadata identifier that is intended to be used to check virtual
/// calls via a member function pointer.
llvm::Metadata *CreateMetadataIdentifierForVirtualMemPtrType(QualType T);
/// Create a metadata identifier for the generalization of the given type.
/// This may either be an MDString (for external identifiers) or a distinct
/// unnamed MDNode (for internal identifiers).
llvm::Metadata *CreateMetadataIdentifierGeneralized(QualType T);
/// Create and attach type metadata to the given function.
void CreateFunctionTypeMetadataForIcall(const FunctionDecl *FD,
llvm::Function *F);
/// Set type metadata to the given function.
void setKCFIType(const FunctionDecl *FD, llvm::Function *F);
/// Emit KCFI type identifier constants and remove unused identifiers.
void finalizeKCFITypes();
/// Whether this function's return type has no side effects, and thus may
/// be trivially discarded if it is unused.
bool MayDropFunctionReturn(const ASTContext &Context,
QualType ReturnType) const;
/// Returns whether this module needs the "all-vtables" type identifier.
bool NeedAllVtablesTypeId() const;
/// Create and attach type metadata for the given vtable.
void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset,
const CXXRecordDecl *RD);
/// Return a vector of most-base classes for RD. This is used to implement
/// control flow integrity checks for member function pointers.
///
/// A most-base class of a class C is defined as a recursive base class of C,
/// including C itself, that does not have any bases.
SmallVector<const CXXRecordDecl *, 0>
getMostBaseClasses(const CXXRecordDecl *RD);
/// Get the declaration of std::terminate for the platform.
llvm::FunctionCallee getTerminateFn();
llvm::SanitizerStatReport &getSanStats();
llvm::Value *
createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF);
/// OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
/// information in the program executable. The argument information stored
/// includes the argument name, its type, the address and access qualifiers
/// used. This helper can be used to generate metadata for source code kernel
/// function as well as generated implicitly kernels. If a kernel is generated
/// implicitly null value has to be passed to the last two parameters,
/// otherwise all parameters must have valid non-null values.
/// \param FN is a pointer to IR function being generated.
/// \param FD is a pointer to function declaration if any.
/// \param CGF is a pointer to CodeGenFunction that generates this function.
void GenKernelArgMetadata(llvm::Function *FN,
const FunctionDecl *FD = nullptr,
CodeGenFunction *CGF = nullptr);
/// Get target specific null pointer.
/// \param T is the LLVM type of the null pointer.
/// \param QT is the clang QualType of the null pointer.
llvm::Constant *getNullPointer(llvm::PointerType *T, QualType QT);
CharUnits getNaturalTypeAlignment(QualType T,
LValueBaseInfo *BaseInfo = nullptr,
TBAAAccessInfo *TBAAInfo = nullptr,
bool forPointeeType = false);
CharUnits getNaturalPointeeTypeAlignment(QualType T,
LValueBaseInfo *BaseInfo = nullptr,
TBAAAccessInfo *TBAAInfo = nullptr);
bool stopAutoInit();
/// Print the postfix for externalized static variable or kernels for single
/// source offloading languages CUDA and HIP. The unique postfix is created
/// using either the CUID argument, or the file's UniqueID and active macros.
/// The fallback method without a CUID requires that the offloading toolchain
/// does not define separate macros via the -cc1 options.
void printPostfixForExternalizedDecl(llvm::raw_ostream &OS,
const Decl *D) const;
/// Move some lazily-emitted states to the NewBuilder. This is especially
/// essential for the incremental parsing environment like Clang Interpreter,
/// because we'll lose all important information after each repl.
void moveLazyEmissionStates(CodeGenModule *NewBuilder);
/// Emit the IR encoding to attach the CUDA launch bounds attribute to \p F.
/// If \p MaxThreadsVal is not nullptr, the max threads value is stored in it,
/// if a valid one was found.
void handleCUDALaunchBoundsAttr(llvm::Function *F,
const CUDALaunchBoundsAttr *A,
int32_t *MaxThreadsVal = nullptr,
int32_t *MinBlocksVal = nullptr,
int32_t *MaxClusterRankVal = nullptr);
/// Emit the IR encoding to attach the AMD GPU flat-work-group-size attribute
/// to \p F. Alternatively, the work group size can be taken from a \p
/// ReqdWGS. If \p MinThreadsVal is not nullptr, the min threads value is
/// stored in it, if a valid one was found. If \p MaxThreadsVal is not
/// nullptr, the max threads value is stored in it, if a valid one was found.
void handleAMDGPUFlatWorkGroupSizeAttr(
llvm::Function *F, const AMDGPUFlatWorkGroupSizeAttr *A,
const ReqdWorkGroupSizeAttr *ReqdWGS = nullptr,
int32_t *MinThreadsVal = nullptr, int32_t *MaxThreadsVal = nullptr);
/// Emit the IR encoding to attach the AMD GPU waves-per-eu attribute to \p F.
void handleAMDGPUWavesPerEUAttr(llvm::Function *F,
const AMDGPUWavesPerEUAttr *A);
llvm::Constant *
GetOrCreateLLVMGlobal(StringRef MangledName, llvm::Type *Ty, LangAS AddrSpace,
const VarDecl *D,
ForDefinition_t IsForDefinition = NotForDefinition);
// FIXME: Hardcoding priority here is gross.
void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
unsigned LexOrder = ~0U,
llvm::Constant *AssociatedData = nullptr);
void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535,
bool IsDtorAttrFunc = false);
private:
llvm::Constant *GetOrCreateLLVMFunction(
StringRef MangledName, llvm::Type *Ty, GlobalDecl D, bool ForVTable,
bool DontDefer = false, bool IsThunk = false,
llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
ForDefinition_t IsForDefinition = NotForDefinition);
// Adds a declaration to the list of multi version functions if not present.
void AddDeferredMultiVersionResolverToEmit(GlobalDecl GD);
// References to multiversion functions are resolved through an implicitly
// defined resolver function. This function is responsible for creating
// the resolver symbol for the provided declaration. The value returned
// will be for an ifunc (llvm::GlobalIFunc) if the current target supports
// that feature and for a regular function (llvm::GlobalValue) otherwise.
llvm::Constant *GetOrCreateMultiVersionResolver(GlobalDecl GD);
// In scenarios where a function is not known to be a multiversion function
// until a later declaration, it is sometimes necessary to change the
// previously created mangled name to align with requirements of whatever
// multiversion function kind the function is now known to be. This function
// is responsible for performing such mangled name updates.
void UpdateMultiVersionNames(GlobalDecl GD, const FunctionDecl *FD,
StringRef &CurName);
bool GetCPUAndFeaturesAttributes(GlobalDecl GD,
llvm::AttrBuilder &AttrBuilder,
bool SetTargetFeatures = true);
void setNonAliasAttributes(GlobalDecl GD, llvm::GlobalObject *GO);
/// Set function attributes for a function declaration.
void SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
bool IsIncompleteFunction, bool IsThunk);
void EmitGlobalDefinition(GlobalDecl D, llvm::GlobalValue *GV = nullptr);
void EmitGlobalFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
void EmitMultiVersionFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
void EmitGlobalVarDefinition(const VarDecl *D, bool IsTentative = false);
void EmitExternalVarDeclaration(const VarDecl *D);
void EmitAliasDefinition(GlobalDecl GD);
void emitIFuncDefinition(GlobalDecl GD);
void emitCPUDispatchDefinition(GlobalDecl GD);
void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
// C++ related functions.
void EmitDeclContext(const DeclContext *DC);
void EmitLinkageSpec(const LinkageSpecDecl *D);
void EmitTopLevelStmt(const TopLevelStmtDecl *D);
/// Emit the function that initializes C++ thread_local variables.
void EmitCXXThreadLocalInitFunc();
/// Emit the function that initializes global variables for a C++ Module.
void EmitCXXModuleInitFunc(clang::Module *Primary);
/// Emit the function that initializes C++ globals.
void EmitCXXGlobalInitFunc();
/// Emit the function that performs cleanup associated with C++ globals.
void EmitCXXGlobalCleanUpFunc();
/// Emit the function that initializes the specified global (if PerformInit is
/// true) and registers its destructor.
void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
llvm::GlobalVariable *Addr,
bool PerformInit);
void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
llvm::Function *InitFunc, InitSegAttr *ISA);
/// EmitCtorList - Generates a global array of functions and priorities using
/// the given list and name. This array will have appending linkage and is
/// suitable for use as a LLVM constructor or destructor array. Clears Fns.
void EmitCtorList(CtorList &Fns, const char *GlobalName);
/// Emit any needed decls for which code generation was deferred.
void EmitDeferred();
/// Try to emit external vtables as available_externally if they have emitted
/// all inlined virtual functions. It runs after EmitDeferred() and therefore
/// is not allowed to create new references to things that need to be emitted
/// lazily.
void EmitVTablesOpportunistically();
/// Call replaceAllUsesWith on all pairs in Replacements.
void applyReplacements();
/// Call replaceAllUsesWith on all pairs in GlobalValReplacements.
void applyGlobalValReplacements();
void checkAliases();
std::map<int, llvm::TinyPtrVector<llvm::Function *>> DtorsUsingAtExit;
/// Register functions annotated with __attribute__((destructor)) using
/// __cxa_atexit, if it is available, or atexit otherwise.
void registerGlobalDtorsWithAtExit();
// When using sinit and sterm functions, unregister
// __attribute__((destructor)) annotated functions which were previously
// registered by the atexit subroutine using unatexit.
void unregisterGlobalDtorsWithUnAtExit();
/// Emit deferred multiversion function resolvers and associated variants.
void emitMultiVersionFunctions();
/// Emit any vtables which we deferred and still have a use for.
void EmitDeferredVTables();
/// Emit a dummy function that reference a CoreFoundation symbol when
/// @available is used on Darwin.
void emitAtAvailableLinkGuard();
/// Emit the llvm.used and llvm.compiler.used metadata.
void emitLLVMUsed();
/// For C++20 Itanium ABI, emit the initializers for the module.
void EmitModuleInitializers(clang::Module *Primary);
/// Emit the link options introduced by imported modules.
void EmitModuleLinkOptions();
/// Helper function for EmitStaticExternCAliases() to redirect ifuncs that
/// have a resolver name that matches 'Elem' to instead resolve to the name of
/// 'CppFunc'. This redirection is necessary in cases where 'Elem' has a name
/// that will be emitted as an alias of the name bound to 'CppFunc'; ifuncs
/// may not reference aliases. Redirection is only performed if 'Elem' is only
/// used by ifuncs in which case, 'Elem' is destroyed. 'true' is returned if
/// redirection is successful, and 'false' is returned otherwise.
bool CheckAndReplaceExternCIFuncs(llvm::GlobalValue *Elem,
llvm::GlobalValue *CppFunc);
/// Emit aliases for internal-linkage declarations inside "C" language
/// linkage specifications, giving them the "expected" name where possible.
void EmitStaticExternCAliases();
void EmitDeclMetadata();
/// Emit the Clang version as llvm.ident metadata.
void EmitVersionIdentMetadata();
/// Emit the Clang commandline as llvm.commandline metadata.
void EmitCommandLineMetadata();
/// Emit the module flag metadata used to pass options controlling the
/// the backend to LLVM.
void EmitBackendOptionsMetadata(const CodeGenOptions &CodeGenOpts);
/// Emits OpenCL specific Metadata e.g. OpenCL version.
void EmitOpenCLMetadata();
/// Emit the llvm.gcov metadata used to tell LLVM where to emit the .gcno and
/// .gcda files in a way that persists in .bc files.
void EmitCoverageFile();
/// Determine whether the definition must be emitted; if this returns \c
/// false, the definition can be emitted lazily if it's used.
bool MustBeEmitted(const ValueDecl *D);
/// Determine whether the definition can be emitted eagerly, or should be
/// delayed until the end of the translation unit. This is relevant for
/// definitions whose linkage can change, e.g. implicit function instantions
/// which may later be explicitly instantiated.
bool MayBeEmittedEagerly(const ValueDecl *D);
/// Check whether we can use a "simpler", more core exceptions personality
/// function.
void SimplifyPersonality();
/// Helper function for getDefaultFunctionAttributes. Builds a set of function
/// attributes which can be simply added to a function.
void getTrivialDefaultFunctionAttributes(StringRef Name, bool HasOptnone,
bool AttrOnCallSite,
llvm::AttrBuilder &FuncAttrs);
/// Helper function for ConstructAttributeList and
/// addDefaultFunctionDefinitionAttributes. Builds a set of function
/// attributes to add to a function with the given properties.
void getDefaultFunctionAttributes(StringRef Name, bool HasOptnone,
bool AttrOnCallSite,
llvm::AttrBuilder &FuncAttrs);
llvm::Metadata *CreateMetadataIdentifierImpl(QualType T, MetadataTypeMap &Map,
StringRef Suffix);
};
} // end namespace CodeGen
} // end namespace clang
#endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
|