-
Notifications
You must be signed in to change notification settings - Fork 10.4k
/
Copy pathGenStruct.cpp
1741 lines (1527 loc) · 70 KB
/
GenStruct.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
//===--- GenStruct.cpp - Swift IR Generation For 'struct' Types -----------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements IR generation for struct types.
//
//===----------------------------------------------------------------------===//
#include "GenStruct.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/Decl.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/SemanticAttrs.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/Types.h"
#include "swift/IRGen/Linking.h"
#include "swift/SIL/SILFunctionBuilder.h"
#include "swift/SIL/SILModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "clang/AST/GlobalDecl.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/RecordLayout.h"
#include "clang/CodeGen/CodeGenABITypes.h"
#include "clang/CodeGen/SwiftCallingConv.h"
#include "clang/Sema/Sema.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "GenDecl.h"
#include "GenMeta.h"
#include "GenRecord.h"
#include "GenType.h"
#include "IRGenFunction.h"
#include "IRGenModule.h"
#include "IndirectTypeInfo.h"
#include "MemberAccessStrategy.h"
#include "MetadataLayout.h"
#include "NonFixedTypeInfo.h"
#include "ResilientTypeInfo.h"
#include "Signature.h"
#include "StructMetadataVisitor.h"
#pragma clang diagnostic ignored "-Winconsistent-missing-override"
using namespace swift;
using namespace irgen;
/// The kinds of TypeInfos implementing struct types.
enum class StructTypeInfoKind {
LoadableStructTypeInfo,
FixedStructTypeInfo,
LoadableClangRecordTypeInfo,
AddressOnlyClangRecordTypeInfo,
NonFixedStructTypeInfo,
ResilientStructTypeInfo
};
static StructTypeInfoKind getStructTypeInfoKind(const TypeInfo &type) {
return (StructTypeInfoKind) type.getSubclassKind();
}
/// If this type has a CXXDestructorDecl, find it and return it. Otherwise,
/// return nullptr.
static clang::CXXDestructorDecl *getCXXDestructor(SILType type) {
auto *structDecl = type.getStructOrBoundGenericStruct();
if (!structDecl || !structDecl->getClangDecl())
return nullptr;
const clang::CXXRecordDecl *cxxRecordDecl =
dyn_cast<clang::CXXRecordDecl>(structDecl->getClangDecl());
if (!cxxRecordDecl)
return nullptr;
return cxxRecordDecl->getDestructor();
}
namespace {
class StructFieldInfo : public RecordField<StructFieldInfo> {
public:
StructFieldInfo(VarDecl *field, const TypeInfo &type)
: RecordField(type), Field(field) {}
/// The field.
VarDecl * const Field;
StringRef getFieldName() const {
return Field->getName().str();
}
SILType getType(IRGenModule &IGM, SILType T) const {
return T.getFieldType(Field, IGM.getSILModule(),
IGM.getMaximalTypeExpansionContext());
}
};
/// A field-info implementation for fields of Clang types.
class ClangFieldInfo : public RecordField<ClangFieldInfo> {
public:
ClangFieldInfo(VarDecl *swiftField, const ElementLayout &layout,
const TypeInfo &typeInfo)
: RecordField(typeInfo), Field(swiftField) {
completeFrom(layout);
}
ClangFieldInfo(VarDecl *swiftField, const ElementLayout &layout,
unsigned explosionBegin, unsigned explosionEnd)
: RecordField(layout, explosionBegin, explosionEnd),
Field(swiftField) {}
VarDecl *Field;
StringRef getFieldName() const {
if (Field) return Field->getName().str();
return "<unimported>";
}
SILType getType(IRGenModule &IGM, SILType T) const {
if (Field)
return T.getFieldType(Field, IGM.getSILModule(),
IGM.getMaximalTypeExpansionContext());
// The Swift-field-less cases use opaque storage, which is
// guaranteed to ignore the type passed to it.
return {};
}
};
/// A common base class for structs.
template <class Impl, class Base, class FieldInfoType = StructFieldInfo>
class StructTypeInfoBase :
public RecordTypeInfo<Impl, Base, FieldInfoType> {
using super = RecordTypeInfo<Impl, Base, FieldInfoType>;
protected:
template <class... As>
StructTypeInfoBase(StructTypeInfoKind kind, As &&...args)
: super(std::forward<As>(args)...) {
super::setSubclassKind((unsigned) kind);
}
using super::asImpl;
public:
const FieldInfoType &getFieldInfo(VarDecl *field) const {
// FIXME: cache the physical field index in the VarDecl.
for (auto &fieldInfo : asImpl().getFields()) {
if (fieldInfo.Field == field)
return fieldInfo;
}
llvm_unreachable("field not in struct?");
}
/// Given a full struct explosion, project out a single field.
virtual void projectFieldFromExplosion(IRGenFunction &IGF, Explosion &in,
VarDecl *field,
Explosion &out) const {
auto &fieldInfo = getFieldInfo(field);
// If the field requires no storage, there's nothing to do.
if (fieldInfo.isEmpty())
return;
// Otherwise, project from the base.
auto fieldRange = fieldInfo.getProjectionRange();
auto elements = in.getRange(fieldRange.first, fieldRange.second);
out.add(elements);
}
/// Given the address of a struct value, project out the address of a
/// single field.
Address projectFieldAddress(IRGenFunction &IGF, Address addr, SILType T,
const FieldInfoType &field) const {
return asImpl().projectFieldAddress(IGF, addr, T, field.Field);
}
/// Given the address of a struct value, project out the address of a
/// single field.
Address projectFieldAddress(IRGenFunction &IGF, Address addr, SILType T,
VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.isEmpty())
return fieldInfo.getTypeInfo().getUndefAddress();
auto offsets = asImpl().getNonFixedOffsets(IGF, T);
return fieldInfo.projectAddress(IGF, addr, offsets);
}
/// Return the constant offset of a field as a Int32Ty, or nullptr if the
/// field is not at a fixed offset.
llvm::Constant *getConstantFieldOffset(IRGenModule &IGM,
VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.hasFixedByteOffset()) {
return llvm::ConstantInt::get(
IGM.Int32Ty, fieldInfo.getFixedByteOffset().getValue());
}
return nullptr;
}
const TypeInfo *getFieldTypeInfo(IRGenModule &IGM, VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.isEmpty())
return nullptr;
return &fieldInfo.getTypeInfo();
}
MemberAccessStrategy getFieldAccessStrategy(IRGenModule &IGM,
SILType T, VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
switch (fieldInfo.getKind()) {
case ElementLayout::Kind::Fixed:
case ElementLayout::Kind::Empty:
case ElementLayout::Kind::EmptyTailAllocatedCType:
return MemberAccessStrategy::getDirectFixed(
fieldInfo.getFixedByteOffset());
case ElementLayout::Kind::InitialNonFixedSize:
return MemberAccessStrategy::getDirectFixed(Size(0));
case ElementLayout::Kind::NonFixed:
return asImpl().getNonFixedFieldAccessStrategy(IGM, T, fieldInfo);
}
llvm_unreachable("bad field layout kind");
}
unsigned getFieldIndex(IRGenModule &IGM, VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
return fieldInfo.getStructIndex();
}
std::optional<unsigned> getFieldIndexIfNotEmpty(IRGenModule &IGM,
VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.isEmpty())
return std::nullopt;
return fieldInfo.getStructIndex();
}
bool isSingleRetainablePointer(ResilienceExpansion expansion,
ReferenceCounting *rc) const override {
// If the type isn't copyable, it doesn't share representation with
// a single-refcounted pointer.
//
// This is sufficient to rule out types with user-defined deinits today,
// since copyable structs are not allowed to define a deinit. If we
// ever added user-defined copy constructors to the language, then we'd
// have to also check that.
if (!this->isCopyable(expansion)) {
return false;
}
auto fields = asImpl().getFields();
if (fields.size() != 1)
return false;
return fields[0].getTypeInfo().isSingleRetainablePointer(expansion, rc);
}
void destroy(IRGenFunction &IGF, Address address, SILType T,
bool isOutlined) const override {
// If the struct has a deinit declared, then call it to destroy the
// value.
if (tryEmitDestroyUsingDeinit(IGF, address, T)) {
return;
}
// Otherwise, perform elementwise destruction of the value.
return super::destroy(IGF, address, T, isOutlined);
}
void verify(IRGenTypeVerifierFunction &IGF,
llvm::Value *metadata,
SILType structType) const override {
// Check that constant field offsets we know match
for (auto &field : asImpl().getFields()) {
switch (field.getKind()) {
case ElementLayout::Kind::Fixed: {
// We know the offset at compile time. See whether there's also an
// entry for this field in the field offset vector.
class FindOffsetOfFieldOffsetVector
: public StructMetadataScanner<FindOffsetOfFieldOffsetVector> {
public:
VarDecl *FieldToFind;
Size AddressPoint = Size::invalid();
Size FieldOffset = Size::invalid();
FindOffsetOfFieldOffsetVector(IRGenModule &IGM, VarDecl *Field)
: StructMetadataScanner<FindOffsetOfFieldOffsetVector>(
IGM, cast<StructDecl>(Field->getDeclContext())),
FieldToFind(Field) {}
void noteAddressPoint() {
AddressPoint = this->NextOffset;
}
void addFieldOffset(VarDecl *Field) {
if (Field == FieldToFind) {
FieldOffset = this->NextOffset;
}
StructMetadataScanner<
FindOffsetOfFieldOffsetVector>::addFieldOffset(Field);
}
};
FindOffsetOfFieldOffsetVector scanner(IGF.IGM, field.Field);
scanner.layout();
if (scanner.FieldOffset == Size::invalid()
|| scanner.AddressPoint == Size::invalid())
continue;
// Load the offset from the field offset vector and ensure it matches
// the compiler's idea of the offset.
auto metadataBytes =
IGF.Builder.CreateBitCast(metadata, IGF.IGM.Int8PtrTy);
auto fieldOffsetPtr = IGF.Builder.CreateInBoundsGEP(
IGF.IGM.Int8Ty, metadataBytes,
IGF.IGM.getSize(scanner.FieldOffset - scanner.AddressPoint));
fieldOffsetPtr =
IGF.Builder.CreateBitCast(fieldOffsetPtr,
IGF.IGM.Int32Ty->getPointerTo());
llvm::Value *fieldOffset = IGF.Builder.CreateLoad(
Address(fieldOffsetPtr, IGF.IGM.Int32Ty, Alignment(4)));
fieldOffset = IGF.Builder.CreateZExtOrBitCast(fieldOffset,
IGF.IGM.SizeTy);
IGF.verifyValues(metadata, fieldOffset,
IGF.IGM.getSize(field.getFixedByteOffset()),
Twine("offset of struct field ") + field.getFieldName());
break;
}
case ElementLayout::Kind::Empty:
case ElementLayout::Kind::EmptyTailAllocatedCType:
case ElementLayout::Kind::InitialNonFixedSize:
case ElementLayout::Kind::NonFixed:
continue;
}
}
}
};
/// A type implementation for loadable record types imported from Clang.
class LoadableClangRecordTypeInfo final
: public StructTypeInfoBase<LoadableClangRecordTypeInfo, LoadableTypeInfo,
ClangFieldInfo> {
const clang::RecordDecl *ClangDecl;
template <class Fn>
void forEachNonEmptyBase(Fn fn) const {
auto &layout = ClangDecl->getASTContext().getASTRecordLayout(ClangDecl);
if (auto cxxRecord = dyn_cast<clang::CXXRecordDecl>(ClangDecl)) {
for (auto base : cxxRecord->bases()) {
auto baseType = base.getType().getCanonicalType();
auto baseRecord = cast<clang::RecordType>(baseType)->getDecl();
auto baseCxxRecord = cast<clang::CXXRecordDecl>(baseRecord);
if (baseCxxRecord->isEmpty())
continue;
auto offset = layout.getBaseClassOffset(baseCxxRecord);
auto size =
ClangDecl->getASTContext().getTypeSizeInChars(baseType);
fn(baseType, offset, size);
}
}
}
public:
LoadableClangRecordTypeInfo(ArrayRef<ClangFieldInfo> fields,
unsigned explosionSize, llvm::Type *storageType,
Size size, SpareBitVector &&spareBits,
Alignment align,
const clang::RecordDecl *clangDecl)
: StructTypeInfoBase(StructTypeInfoKind::LoadableClangRecordTypeInfo,
fields, explosionSize, storageType, size,
std::move(spareBits), align,
IsTriviallyDestroyable,
IsCopyable,
IsFixedSize),
ClangDecl(clangDecl) {}
TypeLayoutEntry
*buildTypeLayoutEntry(IRGenModule &IGM,
SILType T,
bool useStructLayouts) const override {
if (!useStructLayouts) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
if (getFields().empty()) {
return IGM.typeLayoutCache.getEmptyEntry();
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
if (!fieldTy) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy, useStructLayouts));
}
assert(!fields.empty() &&
"Empty structs should not be LoadableClangRecordTypeInfo");
// if (fields.size() == 1 && getBestKnownAlignment() == *fields[0]->fixedAlignment(IGM)) {
// return fields[0];
// }
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(
fields, T, getBestKnownAlignment().getValue(), *this);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
LoadableClangRecordTypeInfo::initialize(IGF, params, addr, isOutlined);
}
void addToAggLowering(IRGenModule &IGM, SwiftAggLowering &lowering,
Size offset) const override {
forEachNonEmptyBase([&](clang::QualType type, clang::CharUnits offset,
clang::CharUnits) {
lowering.addTypedData(type, offset);
});
lowering.addTypedData(ClangDecl, offset.asCharUnits());
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF) const {
return std::nullopt;
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return std::nullopt;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const ClangFieldInfo &field) const {
llvm_unreachable("non-fixed field in Clang type?");
}
};
class AddressOnlyPointerAuthRecordTypeInfo final
: public StructTypeInfoBase<AddressOnlyPointerAuthRecordTypeInfo,
FixedTypeInfo, ClangFieldInfo> {
const clang::RecordDecl *clangDecl;
void emitCopyWithCopyFunction(IRGenFunction &IGF, SILType T, Address src,
Address dst) const {
auto *copyFunction =
clang::CodeGen::getNonTrivialCStructCopyAssignmentOperator(
IGF.IGM.getClangCGM(), dst.getAlignment(), src.getAlignment(),
/*isVolatile*/ false,
clang::QualType(clangDecl->getTypeForDecl(), 0));
auto *dstValue = dst.getAddress();
auto *srcValue = src.getAddress();
IGF.Builder.CreateCall(copyFunction->getFunctionType(), copyFunction,
{dstValue, srcValue});
}
public:
AddressOnlyPointerAuthRecordTypeInfo(ArrayRef<ClangFieldInfo> fields,
llvm::Type *storageType, Size size,
Alignment align,
const clang::RecordDecl *clangDecl)
: StructTypeInfoBase(StructTypeInfoKind::AddressOnlyClangRecordTypeInfo,
fields, storageType, size,
// We can't assume any spare bits in a C++ type
// with user-defined special member functions.
SpareBitVector(std::optional<APInt>{
llvm::APInt(size.getValueInBits(), 0)}),
align, IsNotTriviallyDestroyable,
IsNotBitwiseTakable, IsCopyable, IsFixedSize),
clangDecl(clangDecl) {
(void)clangDecl;
}
TypeLayoutEntry
*buildTypeLayoutEntry(IRGenModule &IGM,
SILType T,
bool useStructLayouts) const override {
if (!useStructLayouts) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
assert(false && "Implement proper type layout info in the future");
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
llvm_unreachable("Address-only C++ types must be created by C++ special "
"member functions.");
}
void initializeWithCopy(IRGenFunction &IGF, Address dst, Address src,
SILType T, bool isOutlined) const override {
emitCopyWithCopyFunction(IGF, T, src, dst);
}
void assignWithCopy(IRGenFunction &IGF, Address dst, Address src, SILType T,
bool isOutlined) const override {
emitCopyWithCopyFunction(IGF, T, src, dst);
}
void initializeWithTake(IRGenFunction &IGF, Address dst, Address src,
SILType T, bool isOutlined) const override {
emitCopyWithCopyFunction(IGF, T, src, dst);
destroy(IGF, src, T, isOutlined);
}
void assignWithTake(IRGenFunction &IGF, Address dst, Address src, SILType T,
bool isOutlined) const override {
emitCopyWithCopyFunction(IGF, T, src, dst);
destroy(IGF, src, T, isOutlined);
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF) const {
return std::nullopt;
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return std::nullopt;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const ClangFieldInfo &field) const {
llvm_unreachable("non-fixed field in Clang type?");
}
};
class AddressOnlyCXXClangRecordTypeInfo final
: public StructTypeInfoBase<AddressOnlyCXXClangRecordTypeInfo,
FixedTypeInfo, ClangFieldInfo> {
const clang::RecordDecl *ClangDecl;
const clang::CXXConstructorDecl *findCopyConstructor() const {
const clang::CXXRecordDecl *cxxRecordDecl =
dyn_cast<clang::CXXRecordDecl>(ClangDecl);
if (!cxxRecordDecl)
return nullptr;
for (auto method : cxxRecordDecl->methods()) {
if (auto ctor = dyn_cast<clang::CXXConstructorDecl>(method)) {
if (ctor->isCopyConstructor() &&
ctor->getAccess() == clang::AS_public &&
// rdar://106964356
// ctor->doesThisDeclarationHaveABody() &&
!ctor->isDeleted())
return ctor;
}
}
return nullptr;
}
const clang::CXXConstructorDecl *findMoveConstructor() const {
const clang::CXXRecordDecl *cxxRecordDecl =
dyn_cast<clang::CXXRecordDecl>(ClangDecl);
if (!cxxRecordDecl)
return nullptr;
for (auto method : cxxRecordDecl->methods()) {
if (auto ctor = dyn_cast<clang::CXXConstructorDecl>(method)) {
if (ctor->isMoveConstructor() &&
ctor->getAccess() == clang::AS_public &&
ctor->doesThisDeclarationHaveABody() &&
!ctor->isDeleted())
return ctor;
}
}
return nullptr;
}
CanSILFunctionType createCXXCopyConstructorFunctionType(IRGenFunction &IGF,
SILType T) const {
// Create the following function type:
// @convention(c) (UnsafePointer<T>) -> @out T
// This is how clang *would* import the copy constructor. So, later, when
// we pass it to "emitCXXConstructorThunkIfNeeded" we get a thunk with
// the following LLVM function type:
// void (%struct.T* %this, %struct.T* %0)
auto ptrTypeDecl =
IGF.getSILModule().getASTContext().getUnsafePointerDecl();
auto sig = ptrTypeDecl->getGenericSignature();
// Map the generic parameter to T
auto subst = SubstitutionMap::get(sig, {T.getASTType()},
LookUpConformanceInModule{IGF.getSwiftModule()});
auto ptrType = ptrTypeDecl->getDeclaredInterfaceType().subst(subst);
SILParameterInfo ptrParam(ptrType->getCanonicalType(),
ParameterConvention::Direct_Unowned);
SILResultInfo result(T.getASTType(), ResultConvention::Indirect);
return SILFunctionType::get(
GenericSignature(),
SILFunctionType::ExtInfo().withRepresentation(
SILFunctionTypeRepresentation::CFunctionPointer),
SILCoroutineKind::None,
/*callee=*/ParameterConvention::Direct_Unowned,
/*params*/ {ptrParam},
/*yields*/ {}, /*results*/ {result},
/*error*/ std::nullopt,
/*pattern subs*/ SubstitutionMap(),
/*invocation subs*/ SubstitutionMap(), IGF.IGM.Context);
}
void emitCopyWithCopyConstructor(
IRGenFunction &IGF, SILType T,
const clang::CXXConstructorDecl *copyConstructor, llvm::Value *src,
llvm::Value *dest) const {
auto fnType = createCXXCopyConstructorFunctionType(IGF, T);
auto globalDecl =
clang::GlobalDecl(copyConstructor, clang::Ctor_Complete);
auto clangFnAddr =
IGF.IGM.getAddrOfClangGlobalDecl(globalDecl, NotForDefinition);
auto callee = cast<llvm::Function>(clangFnAddr->stripPointerCasts());
Signature signature = IGF.IGM.getSignature(fnType, copyConstructor);
std::string name = "__swift_cxx_copy_ctor" + callee->getName().str();
auto *origClangFnAddr = clangFnAddr;
clangFnAddr = emitCXXConstructorThunkIfNeeded(
IGF.IGM, signature, copyConstructor, name, clangFnAddr);
callee = cast<llvm::Function>(clangFnAddr);
llvm::Value *args[] = {dest, src};
if (clangFnAddr == origClangFnAddr) {
// Ensure we can use 'invoke' to trap on uncaught exceptions when
// calling original copy constructor without going through the thunk.
emitCXXConstructorCall(IGF, copyConstructor, callee->getFunctionType(),
callee, args);
return;
}
// Check if we're calling a thunk that traps on exception thrown from copy
// constructor.
if (IGF.IGM.emittedForeignFunctionThunksWithExceptionTraps.count(callee))
IGF.setCallsThunksWithForeignExceptionTraps();
IGF.Builder.CreateCall(callee->getFunctionType(), callee, args);
}
public:
AddressOnlyCXXClangRecordTypeInfo(ArrayRef<ClangFieldInfo> fields,
llvm::Type *storageType, Size size,
Alignment align,
const clang::RecordDecl *clangDecl)
: StructTypeInfoBase(StructTypeInfoKind::AddressOnlyClangRecordTypeInfo,
fields, storageType, size,
// We can't assume any spare bits in a C++ type
// with user-defined special member functions.
SpareBitVector(std::optional<APInt>{
llvm::APInt(size.getValueInBits(), 0)}),
align, IsNotTriviallyDestroyable,
IsNotBitwiseTakable,
// TODO: Set this appropriately for the type's
// C++ import behavior.
IsCopyable, IsFixedSize),
ClangDecl(clangDecl) {
(void)ClangDecl;
}
void destroy(IRGenFunction &IGF, Address address, SILType T,
bool isOutlined) const override {
auto *destructor = getCXXDestructor(T);
// If the destructor is trivial, clang will assert when we call
// `emitCXXDestructorCall` so, just let Swift handle this destructor.
if (!destructor || destructor->isTrivial()) {
// If we didn't find a destructor to call, bail out to the parent
// implementation.
StructTypeInfoBase<AddressOnlyCXXClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::destroy(IGF, address, T,
isOutlined);
return;
}
if (!destructor->isUserProvided() &&
!destructor->doesThisDeclarationHaveABody()) {
assert(!destructor->isDeleted() &&
"Swift cannot handle a type with no known destructor.");
// Make sure we define the destructor so we have something to call.
auto &sema = IGF.IGM.Context.getClangModuleLoader()->getClangSema();
sema.DefineImplicitDestructor(clang::SourceLocation(), destructor);
}
clang::GlobalDecl destructorGlobalDecl(destructor, clang::Dtor_Complete);
auto *destructorFnAddr =
cast<llvm::Function>(IGF.IGM.getAddrOfClangGlobalDecl(
destructorGlobalDecl, NotForDefinition));
SmallVector<llvm::Value *, 2> args;
auto *thisArg = address.getAddress();
args.push_back(thisArg);
llvm::Value *implicitParam =
clang::CodeGen::getCXXDestructorImplicitParam(
IGF.IGM.getClangCGM(), IGF.Builder.GetInsertBlock(),
IGF.Builder.GetInsertPoint(), destructor, clang::Dtor_Complete,
false, false);
if (implicitParam) {
implicitParam = IGF.coerceValue(implicitParam,
destructorFnAddr->getArg(1)->getType(),
IGF.IGM.DataLayout);
args.push_back(implicitParam);
}
bool canThrow = false;
if (IGF.IGM.isForeignExceptionHandlingEnabled()) {
if (!IGF.IGM.isCxxNoThrow(destructor, /*defaultNoThrow=*/true))
canThrow = true;
}
if (canThrow) {
IGF.createExceptionTrapScope([&](llvm::BasicBlock *invokeNormalDest,
llvm::BasicBlock *invokeUnwindDest) {
IGF.Builder.createInvoke(destructorFnAddr->getFunctionType(),
destructorFnAddr, args, invokeNormalDest,
invokeUnwindDest);
});
return;
}
IGF.Builder.CreateCall(destructorFnAddr->getFunctionType(),
destructorFnAddr, args);
}
TypeLayoutEntry
*buildTypeLayoutEntry(IRGenModule &IGM,
SILType T,
bool useStructLayouts) const override {
if (!useStructLayouts || getCXXDestructor(T) ||
!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
if (!fieldTy) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy, useStructLayouts));
}
assert(!fields.empty() &&
"Empty structs should not be AddressOnlyRecordTypeInfo");
if (fields.size() == 1 && getBestKnownAlignment() == *fields[0]->fixedAlignment(IGM)) {
return fields[0];
}
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(
fields, T, getBestKnownAlignment().getValue(), *this);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
llvm_unreachable("Address-only C++ types must be created by C++ special "
"member functions.");
}
void initializeWithCopy(IRGenFunction &IGF, Address destAddr,
Address srcAddr, SILType T,
bool isOutlined) const override {
if (auto copyConstructor = findCopyConstructor()) {
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
srcAddr.getAddress(),
destAddr.getAddress());
return;
}
StructTypeInfoBase<AddressOnlyCXXClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::initializeWithCopy(IGF, destAddr,
srcAddr, T,
isOutlined);
}
void assignWithCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override {
if (auto copyConstructor = findCopyConstructor()) {
destroy(IGF, destAddr, T, isOutlined);
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
srcAddr.getAddress(),
destAddr.getAddress());
return;
}
StructTypeInfoBase<AddressOnlyCXXClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::assignWithCopy(IGF, destAddr, srcAddr,
T, isOutlined);
}
void initializeWithTake(IRGenFunction &IGF, Address dest, Address src,
SILType T, bool isOutlined) const override {
if (auto moveConstructor = findMoveConstructor()) {
emitCopyWithCopyConstructor(IGF, T, moveConstructor,
src.getAddress(),
dest.getAddress());
destroy(IGF, src, T, isOutlined);
return;
}
if (auto copyConstructor = findCopyConstructor()) {
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
src.getAddress(),
dest.getAddress());
destroy(IGF, src, T, isOutlined);
return;
}
StructTypeInfoBase<AddressOnlyCXXClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::initializeWithTake(IGF, dest, src, T,
isOutlined);
}
void assignWithTake(IRGenFunction &IGF, Address dest, Address src, SILType T,
bool isOutlined) const override {
if (auto moveConstructor = findMoveConstructor()) {
destroy(IGF, dest, T, isOutlined);
emitCopyWithCopyConstructor(IGF, T, moveConstructor,
src.getAddress(),
dest.getAddress());
destroy(IGF, src, T, isOutlined);
return;
}
if (auto copyConstructor = findCopyConstructor()) {
destroy(IGF, dest, T, isOutlined);
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
src.getAddress(),
dest.getAddress());
destroy(IGF, src, T, isOutlined);
return;
}
StructTypeInfoBase<AddressOnlyCXXClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::assignWithTake(IGF, dest, src, T,
isOutlined);
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF) const {
return std::nullopt;
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return std::nullopt;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const ClangFieldInfo &field) const {
llvm_unreachable("non-fixed field in Clang type?");
}
};
/// A type implementation for loadable struct types.
class LoadableStructTypeInfo final
: public StructTypeInfoBase<LoadableStructTypeInfo, LoadableTypeInfo> {
using super = StructTypeInfoBase<LoadableStructTypeInfo, LoadableTypeInfo>;
public:
LoadableStructTypeInfo(ArrayRef<StructFieldInfo> fields,
unsigned explosionSize,
llvm::Type *storageType, Size size,
SpareBitVector &&spareBits,
Alignment align,
IsTriviallyDestroyable_t isTriviallyDestroyable,
IsCopyable_t isCopyable,
IsFixedSize_t alwaysFixedSize)
: StructTypeInfoBase(StructTypeInfoKind::LoadableStructTypeInfo,
fields, explosionSize,
storageType, size, std::move(spareBits),
align, isTriviallyDestroyable,
isCopyable,
alwaysFixedSize)
{}
void addToAggLowering(IRGenModule &IGM, SwiftAggLowering &lowering,
Size offset) const override {
for (auto &field : getFields()) {
auto fieldOffset = offset + field.getFixedByteOffset();
cast<LoadableTypeInfo>(field.getTypeInfo())
.addToAggLowering(IGM, lowering, fieldOffset);
}
}
TypeLayoutEntry
*buildTypeLayoutEntry(IRGenModule &IGM,
SILType T,
bool useStructLayouts) const override {
if (!useStructLayouts) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
if (getFields().empty()) {
return IGM.typeLayoutCache.getEmptyEntry();
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy, useStructLayouts));
}
// if (fields.size() == 1 && isFixedSize() &&
// getBestKnownAlignment() == *fields[0]->fixedAlignment(IGM)) {
// return fields[0];
// }
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(
fields, T, getBestKnownAlignment().getValue(), *this);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
LoadableStructTypeInfo::initialize(IGF, params, addr, isOutlined);
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF) const {
return std::nullopt;
}
std::nullopt_t getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return std::nullopt;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const StructFieldInfo &field) const {
llvm_unreachable("non-fixed field in loadable type?");
}
void consume(IRGenFunction &IGF, Explosion &explosion,
Atomicity atomicity, SILType T) const override {
// If the struct has a deinit declared, then call it to consume the
// value.
if (tryEmitConsumeUsingDeinit(IGF, explosion, T)) {
return;
}
// Otherwise, do elementwise destruction of the value.
return super::consume(IGF, explosion, atomicity, T);
}
};
/// A type implementation for non-loadable but fixed-size struct types.
class FixedStructTypeInfo final
: public StructTypeInfoBase<FixedStructTypeInfo,
IndirectTypeInfo<FixedStructTypeInfo,
FixedTypeInfo>> {
public:
// FIXME: Spare bits between struct members.
FixedStructTypeInfo(ArrayRef<StructFieldInfo> fields, llvm::Type *T,
Size size, SpareBitVector &&spareBits,
Alignment align,
IsTriviallyDestroyable_t isTriviallyDestroyable,
IsBitwiseTakable_t isBT,
IsCopyable_t isCopyable,
IsFixedSize_t alwaysFixedSize)
: StructTypeInfoBase(StructTypeInfoKind::FixedStructTypeInfo,
fields, T, size, std::move(spareBits), align,
isTriviallyDestroyable, isBT, isCopyable,
alwaysFixedSize)
{}
TypeLayoutEntry
*buildTypeLayoutEntry(IRGenModule &IGM,
SILType T,
bool useStructLayouts) const override {
if (!useStructLayouts) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
auto decl = T.getASTType()->getStructOrBoundGenericStruct();
auto rawLayout = decl->getAttrs().getAttribute<RawLayoutAttr>();
// If we have a raw layout struct who is fixed size, it means the
// layout of the struct is fully concrete.
if (rawLayout) {
// Defer to this fixed type info for type layout if the raw layout
// specifies size and alignment.
if (rawLayout->getSizeAndAlignment()) {
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T);
}
auto likeType = rawLayout->getResolvedLikeType(decl)->getCanonicalType();
SILType loweredLikeType = IGM.getLoweredType(likeType);
// The given struct type T that we're building is fully concrete, but
// our like type is still in terms of the potential archetype of the
// type.
auto subs = T.getASTType()->getContextSubstitutionMap(
IGM.getSwiftModule(), decl);
loweredLikeType = loweredLikeType.subst(IGM.getSILModule(), subs);
// Array like raw layouts are still handled correctly even though the
// type layout entry is only that of the like type.
return IGM.getTypeInfo(loweredLikeType)