1//===- DeclCXX.cpp - C++ Declaration AST Node Implementation --------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the C++ related Decl classes.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/DeclCXX.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ASTLambda.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/ASTUnresolvedSet.h"
18#include "clang/AST/Attr.h"
19#include "clang/AST/CXXInheritance.h"
20#include "clang/AST/DeclBase.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/DeclarationName.h"
23#include "clang/AST/Expr.h"
24#include "clang/AST/ExprCXX.h"
25#include "clang/AST/LambdaCapture.h"
26#include "clang/AST/NestedNameSpecifier.h"
27#include "clang/AST/ODRHash.h"
28#include "clang/AST/Type.h"
29#include "clang/AST/TypeLoc.h"
30#include "clang/AST/UnresolvedSet.h"
31#include "clang/Basic/Diagnostic.h"
32#include "clang/Basic/DiagnosticAST.h"
33#include "clang/Basic/IdentifierTable.h"
34#include "clang/Basic/LLVM.h"
35#include "clang/Basic/LangOptions.h"
36#include "clang/Basic/OperatorKinds.h"
37#include "clang/Basic/SourceLocation.h"
38#include "clang/Basic/Specifiers.h"
39#include "clang/Basic/TargetInfo.h"
40#include "llvm/ADT/SmallPtrSet.h"
41#include "llvm/ADT/SmallVector.h"
42#include "llvm/ADT/iterator_range.h"
43#include "llvm/Support/Casting.h"
44#include "llvm/Support/ErrorHandling.h"
45#include "llvm/Support/Format.h"
46#include "llvm/Support/raw_ostream.h"
47#include <algorithm>
48#include <cassert>
49#include <cstddef>
50#include <cstdint>
51
52using namespace clang;
53
54//===----------------------------------------------------------------------===//
55// Decl Allocation/Deallocation Method Implementations
56//===----------------------------------------------------------------------===//
57
58void AccessSpecDecl::anchor() {}
59
60AccessSpecDecl *AccessSpecDecl::CreateDeserialized(ASTContext &C,
61 GlobalDeclID ID) {
62 return new (C, ID) AccessSpecDecl(EmptyShell());
63}
64
65void LazyASTUnresolvedSet::getFromExternalSource(ASTContext &C) const {
66 ExternalASTSource *Source = C.getExternalSource();
67 assert(Impl.Decls.isLazy() && "getFromExternalSource for non-lazy set");
68 assert(Source && "getFromExternalSource with no external source");
69
70 for (ASTUnresolvedSet::iterator I = Impl.begin(); I != Impl.end(); ++I)
71 I.setDecl(
72 cast<NamedDecl>(Val: Source->GetExternalDecl(ID: GlobalDeclID(I.getDeclID()))));
73 Impl.Decls.setLazy(false);
74}
75
76CXXRecordDecl::DefinitionData::DefinitionData(CXXRecordDecl *D)
77 : UserDeclaredConstructor(false), UserDeclaredSpecialMembers(0),
78 Aggregate(true), PlainOldData(true), Empty(true), Polymorphic(false),
79 Abstract(false), IsStandardLayout(true), IsCXX11StandardLayout(true),
80 HasBasesWithFields(false), HasBasesWithNonStaticDataMembers(false),
81 HasPrivateFields(false), HasProtectedFields(false),
82 HasPublicFields(false), HasMutableFields(false), HasVariantMembers(false),
83 HasOnlyCMembers(true), HasInitMethod(false), HasInClassInitializer(false),
84 HasUninitializedReferenceMember(false), HasUninitializedFields(false),
85 HasInheritedConstructor(false), HasInheritedDefaultConstructor(false),
86 HasInheritedAssignment(false),
87 NeedOverloadResolutionForCopyConstructor(false),
88 NeedOverloadResolutionForMoveConstructor(false),
89 NeedOverloadResolutionForCopyAssignment(false),
90 NeedOverloadResolutionForMoveAssignment(false),
91 NeedOverloadResolutionForDestructor(false),
92 DefaultedCopyConstructorIsDeleted(false),
93 DefaultedMoveConstructorIsDeleted(false),
94 DefaultedCopyAssignmentIsDeleted(false),
95 DefaultedMoveAssignmentIsDeleted(false),
96 DefaultedDestructorIsDeleted(false), HasTrivialSpecialMembers(SMF_All),
97 HasTrivialSpecialMembersForCall(SMF_All),
98 DeclaredNonTrivialSpecialMembers(0),
99 DeclaredNonTrivialSpecialMembersForCall(0), HasIrrelevantDestructor(true),
100 HasConstexprNonCopyMoveConstructor(false),
101 HasDefaultedDefaultConstructor(false),
102 DefaultedDefaultConstructorIsConstexpr(true),
103 HasConstexprDefaultConstructor(false),
104 DefaultedDestructorIsConstexpr(true),
105 HasNonLiteralTypeFieldsOrBases(false), StructuralIfLiteral(true),
106 UserProvidedDefaultConstructor(false), DeclaredSpecialMembers(0),
107 ImplicitCopyConstructorCanHaveConstParamForVBase(true),
108 ImplicitCopyConstructorCanHaveConstParamForNonVBase(true),
109 ImplicitCopyAssignmentHasConstParam(true),
110 HasDeclaredCopyConstructorWithConstParam(false),
111 HasDeclaredCopyAssignmentWithConstParam(false),
112 IsAnyDestructorNoReturn(false), IsHLSLIntangible(false), IsPFPType(false),
113 IsLambda(false), IsParsingBaseSpecifiers(false),
114 ComputedVisibleConversions(false), HasODRHash(false), Definition(D) {}
115
116CXXBaseSpecifier *CXXRecordDecl::DefinitionData::getBasesSlowCase() const {
117 return Bases.get(Source: Definition->getASTContext().getExternalSource());
118}
119
120CXXBaseSpecifier *CXXRecordDecl::DefinitionData::getVBasesSlowCase() const {
121 return VBases.get(Source: Definition->getASTContext().getExternalSource());
122}
123
124CXXRecordDecl::CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C,
125 DeclContext *DC, SourceLocation StartLoc,
126 SourceLocation IdLoc, IdentifierInfo *Id,
127 CXXRecordDecl *PrevDecl)
128 : RecordDecl(K, TK, C, DC, StartLoc, IdLoc, Id, PrevDecl),
129 DefinitionData(PrevDecl ? PrevDecl->DefinitionData
130 : nullptr) {}
131
132CXXRecordDecl *CXXRecordDecl::Create(const ASTContext &C, TagKind TK,
133 DeclContext *DC, SourceLocation StartLoc,
134 SourceLocation IdLoc, IdentifierInfo *Id,
135 CXXRecordDecl *PrevDecl) {
136 return new (C, DC)
137 CXXRecordDecl(CXXRecord, TK, C, DC, StartLoc, IdLoc, Id, PrevDecl);
138}
139
140CXXRecordDecl *
141CXXRecordDecl::CreateLambda(const ASTContext &C, DeclContext *DC,
142 TypeSourceInfo *Info, SourceLocation Loc,
143 unsigned DependencyKind, bool IsGeneric,
144 LambdaCaptureDefault CaptureDefault) {
145 auto *R = new (C, DC) CXXRecordDecl(CXXRecord, TagTypeKind::Class, C, DC, Loc,
146 Loc, nullptr, nullptr);
147 R->setBeingDefined(true);
148 R->DefinitionData = new (C) struct LambdaDefinitionData(
149 R, Info, DependencyKind, IsGeneric, CaptureDefault);
150 R->setImplicit(true);
151 return R;
152}
153
154CXXRecordDecl *CXXRecordDecl::CreateDeserialized(const ASTContext &C,
155 GlobalDeclID ID) {
156 auto *R = new (C, ID)
157 CXXRecordDecl(CXXRecord, TagTypeKind::Struct, C, nullptr,
158 SourceLocation(), SourceLocation(), nullptr, nullptr);
159 return R;
160}
161
162/// Determine whether a class has a repeated base class. This is intended for
163/// use when determining if a class is standard-layout, so makes no attempt to
164/// handle virtual bases.
165static bool hasRepeatedBaseClass(const CXXRecordDecl *StartRD) {
166 llvm::SmallPtrSet<const CXXRecordDecl*, 8> SeenBaseTypes;
167 SmallVector<const CXXRecordDecl*, 8> WorkList = {StartRD};
168 while (!WorkList.empty()) {
169 const CXXRecordDecl *RD = WorkList.pop_back_val();
170 if (RD->isDependentType())
171 continue;
172 for (const CXXBaseSpecifier &BaseSpec : RD->bases()) {
173 if (const CXXRecordDecl *B = BaseSpec.getType()->getAsCXXRecordDecl()) {
174 if (!SeenBaseTypes.insert(Ptr: B).second)
175 return true;
176 WorkList.push_back(Elt: B);
177 }
178 }
179 }
180 return false;
181}
182
183void
184CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
185 unsigned NumBases) {
186 ASTContext &C = getASTContext();
187
188 if (!data().Bases.isOffset() && data().NumBases > 0)
189 C.Deallocate(Ptr: data().getBases());
190
191 if (NumBases) {
192 if (!C.getLangOpts().CPlusPlus17) {
193 // C++ [dcl.init.aggr]p1:
194 // An aggregate is [...] a class with [...] no base classes [...].
195 data().Aggregate = false;
196 }
197
198 // C++ [class]p4:
199 // A POD-struct is an aggregate class...
200 data().PlainOldData = false;
201 }
202
203 // The set of seen virtual base types.
204 llvm::SmallPtrSet<CanQualType, 8> SeenVBaseTypes;
205
206 // The virtual bases of this class.
207 SmallVector<const CXXBaseSpecifier *, 8> VBases;
208
209 data().Bases = new(C) CXXBaseSpecifier [NumBases];
210 data().NumBases = NumBases;
211 for (unsigned i = 0; i < NumBases; ++i) {
212 data().getBases()[i] = *Bases[i];
213 // Keep track of inherited vbases for this base class.
214 const CXXBaseSpecifier *Base = Bases[i];
215 QualType BaseType = Base->getType();
216 // Skip dependent types; we can't do any checking on them now.
217 if (BaseType->isDependentType())
218 continue;
219 auto *BaseClassDecl = BaseType->castAsCXXRecordDecl();
220
221 // C++2a [class]p7:
222 // A standard-layout class is a class that:
223 // [...]
224 // -- has all non-static data members and bit-fields in the class and
225 // its base classes first declared in the same class
226 if (BaseClassDecl->data().HasBasesWithFields ||
227 !BaseClassDecl->field_empty()) {
228 if (data().HasBasesWithFields)
229 // Two bases have members or bit-fields: not standard-layout.
230 data().IsStandardLayout = false;
231 data().HasBasesWithFields = true;
232 }
233
234 // C++11 [class]p7:
235 // A standard-layout class is a class that:
236 // -- [...] has [...] at most one base class with non-static data
237 // members
238 if (BaseClassDecl->data().HasBasesWithNonStaticDataMembers ||
239 BaseClassDecl->hasDirectFields()) {
240 if (data().HasBasesWithNonStaticDataMembers)
241 data().IsCXX11StandardLayout = false;
242 data().HasBasesWithNonStaticDataMembers = true;
243 }
244
245 if (!BaseClassDecl->isEmpty()) {
246 // C++14 [meta.unary.prop]p4:
247 // T is a class type [...] with [...] no base class B for which
248 // is_empty<B>::value is false.
249 data().Empty = false;
250 }
251
252 // C++1z [dcl.init.agg]p1:
253 // An aggregate is a class with [...] no private or protected base classes
254 if (Base->getAccessSpecifier() != AS_public) {
255 data().Aggregate = false;
256
257 // C++20 [temp.param]p7:
258 // A structural type is [...] a literal class type with [...] all base
259 // classes [...] public
260 data().StructuralIfLiteral = false;
261 }
262
263 // C++ [class.virtual]p1:
264 // A class that declares or inherits a virtual function is called a
265 // polymorphic class.
266 if (BaseClassDecl->isPolymorphic()) {
267 data().Polymorphic = true;
268
269 // An aggregate is a class with [...] no virtual functions.
270 data().Aggregate = false;
271 }
272
273 // C++0x [class]p7:
274 // A standard-layout class is a class that: [...]
275 // -- has no non-standard-layout base classes
276 if (!BaseClassDecl->isStandardLayout())
277 data().IsStandardLayout = false;
278 if (!BaseClassDecl->isCXX11StandardLayout())
279 data().IsCXX11StandardLayout = false;
280
281 // Record if this base is the first non-literal field or base.
282 if (!hasNonLiteralTypeFieldsOrBases() && !BaseType->isLiteralType(Ctx: C))
283 data().HasNonLiteralTypeFieldsOrBases = true;
284
285 // Now go through all virtual bases of this base and add them.
286 for (const auto &VBase : BaseClassDecl->vbases()) {
287 // Add this base if it's not already in the list.
288 if (SeenVBaseTypes.insert(Ptr: C.getCanonicalType(T: VBase.getType())).second) {
289 VBases.push_back(Elt: &VBase);
290
291 // C++11 [class.copy]p8:
292 // The implicitly-declared copy constructor for a class X will have
293 // the form 'X::X(const X&)' if each [...] virtual base class B of X
294 // has a copy constructor whose first parameter is of type
295 // 'const B&' or 'const volatile B&' [...]
296 if (CXXRecordDecl *VBaseDecl = VBase.getType()->getAsCXXRecordDecl())
297 if (!VBaseDecl->hasCopyConstructorWithConstParam())
298 data().ImplicitCopyConstructorCanHaveConstParamForVBase = false;
299
300 // C++1z [dcl.init.agg]p1:
301 // An aggregate is a class with [...] no virtual base classes
302 data().Aggregate = false;
303 }
304 }
305
306 if (Base->isVirtual()) {
307 // Add this base if it's not already in the list.
308 if (SeenVBaseTypes.insert(Ptr: C.getCanonicalType(T: BaseType)).second)
309 VBases.push_back(Elt: Base);
310
311 // C++14 [meta.unary.prop] is_empty:
312 // T is a class type, but not a union type, with ... no virtual base
313 // classes
314 data().Empty = false;
315
316 // C++1z [dcl.init.agg]p1:
317 // An aggregate is a class with [...] no virtual base classes
318 data().Aggregate = false;
319
320 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
321 // A [default constructor, copy/move constructor, or copy/move assignment
322 // operator for a class X] is trivial [...] if:
323 // -- class X has [...] no virtual base classes
324 data().HasTrivialSpecialMembers &= SMF_Destructor;
325 data().HasTrivialSpecialMembersForCall &= SMF_Destructor;
326
327 // C++0x [class]p7:
328 // A standard-layout class is a class that: [...]
329 // -- has [...] no virtual base classes
330 data().IsStandardLayout = false;
331 data().IsCXX11StandardLayout = false;
332
333 // C++20 [dcl.constexpr]p3:
334 // In the definition of a constexpr function [...]
335 // -- if the function is a constructor or destructor,
336 // its class shall not have any virtual base classes
337 data().DefaultedDefaultConstructorIsConstexpr = false;
338 data().DefaultedDestructorIsConstexpr = false;
339
340 // C++1z [class.copy]p8:
341 // The implicitly-declared copy constructor for a class X will have
342 // the form 'X::X(const X&)' if each potentially constructed subobject
343 // has a copy constructor whose first parameter is of type
344 // 'const B&' or 'const volatile B&' [...]
345 if (!BaseClassDecl->hasCopyConstructorWithConstParam())
346 data().ImplicitCopyConstructorCanHaveConstParamForVBase = false;
347 } else {
348 // C++ [class.ctor]p5:
349 // A default constructor is trivial [...] if:
350 // -- all the direct base classes of its class have trivial default
351 // constructors.
352 if (!BaseClassDecl->hasTrivialDefaultConstructor())
353 data().HasTrivialSpecialMembers &= ~SMF_DefaultConstructor;
354
355 // C++0x [class.copy]p13:
356 // A copy/move constructor for class X is trivial if [...]
357 // [...]
358 // -- the constructor selected to copy/move each direct base class
359 // subobject is trivial, and
360 if (!BaseClassDecl->hasTrivialCopyConstructor())
361 data().HasTrivialSpecialMembers &= ~SMF_CopyConstructor;
362
363 if (!BaseClassDecl->hasTrivialCopyConstructorForCall())
364 data().HasTrivialSpecialMembersForCall &= ~SMF_CopyConstructor;
365
366 // If the base class doesn't have a simple move constructor, we'll eagerly
367 // declare it and perform overload resolution to determine which function
368 // it actually calls. If it does have a simple move constructor, this
369 // check is correct.
370 if (!BaseClassDecl->hasTrivialMoveConstructor())
371 data().HasTrivialSpecialMembers &= ~SMF_MoveConstructor;
372
373 if (!BaseClassDecl->hasTrivialMoveConstructorForCall())
374 data().HasTrivialSpecialMembersForCall &= ~SMF_MoveConstructor;
375
376 // C++0x [class.copy]p27:
377 // A copy/move assignment operator for class X is trivial if [...]
378 // [...]
379 // -- the assignment operator selected to copy/move each direct base
380 // class subobject is trivial, and
381 if (!BaseClassDecl->hasTrivialCopyAssignment())
382 data().HasTrivialSpecialMembers &= ~SMF_CopyAssignment;
383 // If the base class doesn't have a simple move assignment, we'll eagerly
384 // declare it and perform overload resolution to determine which function
385 // it actually calls. If it does have a simple move assignment, this
386 // check is correct.
387 if (!BaseClassDecl->hasTrivialMoveAssignment())
388 data().HasTrivialSpecialMembers &= ~SMF_MoveAssignment;
389
390 // C++11 [class.ctor]p6:
391 // If that user-written default constructor would satisfy the
392 // requirements of a constexpr constructor/function(C++23), the
393 // implicitly-defined default constructor is constexpr.
394 if (!BaseClassDecl->hasConstexprDefaultConstructor())
395 data().DefaultedDefaultConstructorIsConstexpr =
396 C.getLangOpts().CPlusPlus23;
397
398 // C++1z [class.copy]p8:
399 // The implicitly-declared copy constructor for a class X will have
400 // the form 'X::X(const X&)' if each potentially constructed subobject
401 // has a copy constructor whose first parameter is of type
402 // 'const B&' or 'const volatile B&' [...]
403 if (!BaseClassDecl->hasCopyConstructorWithConstParam())
404 data().ImplicitCopyConstructorCanHaveConstParamForNonVBase = false;
405 }
406
407 // C++ [class.ctor]p3:
408 // A destructor is trivial if all the direct base classes of its class
409 // have trivial destructors.
410 if (!BaseClassDecl->hasTrivialDestructor())
411 data().HasTrivialSpecialMembers &= ~SMF_Destructor;
412
413 if (!BaseClassDecl->hasTrivialDestructorForCall())
414 data().HasTrivialSpecialMembersForCall &= ~SMF_Destructor;
415
416 if (!BaseClassDecl->hasIrrelevantDestructor())
417 data().HasIrrelevantDestructor = false;
418
419 if (BaseClassDecl->isAnyDestructorNoReturn())
420 data().IsAnyDestructorNoReturn = true;
421
422 if (BaseClassDecl->isHLSLIntangible())
423 data().IsHLSLIntangible = true;
424
425 // C++11 [class.copy]p18:
426 // The implicitly-declared copy assignment operator for a class X will
427 // have the form 'X& X::operator=(const X&)' if each direct base class B
428 // of X has a copy assignment operator whose parameter is of type 'const
429 // B&', 'const volatile B&', or 'B' [...]
430 if (!BaseClassDecl->hasCopyAssignmentWithConstParam())
431 data().ImplicitCopyAssignmentHasConstParam = false;
432
433 // A class has an Objective-C object member if... or any of its bases
434 // has an Objective-C object member.
435 if (BaseClassDecl->hasObjectMember())
436 setHasObjectMember(true);
437
438 if (BaseClassDecl->hasVolatileMember())
439 setHasVolatileMember(true);
440
441 if (BaseClassDecl->getArgPassingRestrictions() ==
442 RecordArgPassingKind::CanNeverPassInRegs)
443 setArgPassingRestrictions(RecordArgPassingKind::CanNeverPassInRegs);
444
445 // Keep track of the presence of mutable fields.
446 if (BaseClassDecl->hasMutableFields())
447 data().HasMutableFields = true;
448
449 if (BaseClassDecl->hasUninitializedExplicitInitFields() &&
450 BaseClassDecl->isAggregate())
451 setHasUninitializedExplicitInitFields(true);
452
453 if (BaseClassDecl->hasUninitializedReferenceMember())
454 data().HasUninitializedReferenceMember = true;
455
456 if (!BaseClassDecl->allowConstDefaultInit())
457 data().HasUninitializedFields = true;
458
459 if (BaseClassDecl->isPFPType())
460 data().IsPFPType = true;
461
462 addedClassSubobject(Base: BaseClassDecl);
463 }
464
465 // C++2a [class]p7:
466 // A class S is a standard-layout class if it:
467 // -- has at most one base class subobject of any given type
468 //
469 // Note that we only need to check this for classes with more than one base
470 // class. If there's only one base class, and it's standard layout, then
471 // we know there are no repeated base classes.
472 if (data().IsStandardLayout && NumBases > 1 && hasRepeatedBaseClass(StartRD: this))
473 data().IsStandardLayout = false;
474
475 if (VBases.empty()) {
476 data().IsParsingBaseSpecifiers = false;
477 return;
478 }
479
480 // Create base specifier for any direct or indirect virtual bases.
481 data().VBases = new (C) CXXBaseSpecifier[VBases.size()];
482 data().NumVBases = VBases.size();
483 for (int I = 0, E = VBases.size(); I != E; ++I) {
484 QualType Type = VBases[I]->getType();
485 if (!Type->isDependentType())
486 addedClassSubobject(Base: Type->getAsCXXRecordDecl());
487 data().getVBases()[I] = *VBases[I];
488 }
489
490 data().IsParsingBaseSpecifiers = false;
491}
492
493unsigned CXXRecordDecl::getODRHash() const {
494 assert(hasDefinition() && "ODRHash only for records with definitions");
495
496 // Previously calculated hash is stored in DefinitionData.
497 if (DefinitionData->HasODRHash)
498 return DefinitionData->ODRHash;
499
500 // Only calculate hash on first call of getODRHash per record.
501 ODRHash Hash;
502 Hash.AddCXXRecordDecl(Record: getDefinition());
503 DefinitionData->HasODRHash = true;
504 DefinitionData->ODRHash = Hash.CalculateHash();
505
506 return DefinitionData->ODRHash;
507}
508
509void CXXRecordDecl::addedClassSubobject(CXXRecordDecl *Subobj) {
510 // C++11 [class.copy]p11:
511 // A defaulted copy/move constructor for a class X is defined as
512 // deleted if X has:
513 // -- a direct or virtual base class B that cannot be copied/moved [...]
514 // -- a non-static data member of class type M (or array thereof)
515 // that cannot be copied or moved [...]
516 if (!Subobj->hasSimpleCopyConstructor())
517 data().NeedOverloadResolutionForCopyConstructor = true;
518 if (!Subobj->hasSimpleMoveConstructor())
519 data().NeedOverloadResolutionForMoveConstructor = true;
520
521 // C++11 [class.copy]p23:
522 // A defaulted copy/move assignment operator for a class X is defined as
523 // deleted if X has:
524 // -- a direct or virtual base class B that cannot be copied/moved [...]
525 // -- a non-static data member of class type M (or array thereof)
526 // that cannot be copied or moved [...]
527 if (!Subobj->hasSimpleCopyAssignment())
528 data().NeedOverloadResolutionForCopyAssignment = true;
529 if (!Subobj->hasSimpleMoveAssignment())
530 data().NeedOverloadResolutionForMoveAssignment = true;
531
532 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5:
533 // A defaulted [ctor or dtor] for a class X is defined as
534 // deleted if X has:
535 // -- any direct or virtual base class [...] has a type with a destructor
536 // that is deleted or inaccessible from the defaulted [ctor or dtor].
537 // -- any non-static data member has a type with a destructor
538 // that is deleted or inaccessible from the defaulted [ctor or dtor].
539 if (!Subobj->hasSimpleDestructor()) {
540 data().NeedOverloadResolutionForCopyConstructor = true;
541 data().NeedOverloadResolutionForMoveConstructor = true;
542 data().NeedOverloadResolutionForDestructor = true;
543 }
544
545 // C++20 [dcl.constexpr]p5:
546 // The definition of a constexpr destructor whose function-body is not
547 // = delete shall additionally satisfy the following requirement:
548 // -- for every subobject of class type or (possibly multi-dimensional)
549 // array thereof, that class type shall have a constexpr destructor
550 if (!Subobj->hasConstexprDestructor())
551 data().DefaultedDestructorIsConstexpr =
552 getASTContext().getLangOpts().CPlusPlus23;
553
554 // C++20 [temp.param]p7:
555 // A structural type is [...] a literal class type [for which] the types
556 // of all base classes and non-static data members are structural types or
557 // (possibly multi-dimensional) array thereof
558 if (!Subobj->data().StructuralIfLiteral)
559 data().StructuralIfLiteral = false;
560}
561
562const CXXRecordDecl *CXXRecordDecl::getStandardLayoutBaseWithFields() const {
563 assert(
564 isStandardLayout() &&
565 "getStandardLayoutBaseWithFields called on a non-standard-layout type");
566#ifdef EXPENSIVE_CHECKS
567 {
568 unsigned NumberOfBasesWithFields = 0;
569 if (!field_empty())
570 ++NumberOfBasesWithFields;
571 llvm::SmallPtrSet<const CXXRecordDecl *, 8> UniqueBases;
572 forallBases([&](const CXXRecordDecl *Base) -> bool {
573 if (!Base->field_empty())
574 ++NumberOfBasesWithFields;
575 assert(
576 UniqueBases.insert(Base->getCanonicalDecl()).second &&
577 "Standard layout struct has multiple base classes of the same type");
578 return true;
579 });
580 assert(NumberOfBasesWithFields <= 1 &&
581 "Standard layout struct has fields declared in more than one class");
582 }
583#endif
584 if (!field_empty())
585 return this;
586 const CXXRecordDecl *Result = this;
587 forallBases(BaseMatches: [&](const CXXRecordDecl *Base) -> bool {
588 if (!Base->field_empty()) {
589 // This is the base where the fields are declared; return early
590 Result = Base;
591 return false;
592 }
593 return true;
594 });
595 return Result;
596}
597
598bool CXXRecordDecl::hasConstexprDestructor() const {
599 auto *Dtor = getDestructor();
600 return Dtor ? Dtor->isConstexpr() : defaultedDestructorIsConstexpr();
601}
602
603bool CXXRecordDecl::hasAnyDependentBases() const {
604 if (!isDependentContext())
605 return false;
606
607 return !forallBases(BaseMatches: [](const CXXRecordDecl *) { return true; });
608}
609
610bool CXXRecordDecl::isTriviallyCopyable() const {
611 // C++0x [class]p5:
612 // A trivially copyable class is a class that:
613 // -- has no non-trivial copy constructors,
614 if (hasNonTrivialCopyConstructor()) return false;
615 // -- has no non-trivial move constructors,
616 if (hasNonTrivialMoveConstructor()) return false;
617 // -- has no non-trivial copy assignment operators,
618 if (hasNonTrivialCopyAssignment()) return false;
619 // -- has no non-trivial move assignment operators, and
620 if (hasNonTrivialMoveAssignment()) return false;
621 // -- has a trivial destructor.
622 if (!hasTrivialDestructor()) return false;
623
624 return true;
625}
626
627bool CXXRecordDecl::isTriviallyCopyConstructible() const {
628
629 // A trivially copy constructible class is a class that:
630 // -- has no non-trivial copy constructors,
631 if (hasNonTrivialCopyConstructor())
632 return false;
633 // -- has a trivial destructor.
634 if (!hasTrivialDestructor())
635 return false;
636
637 return true;
638}
639
640void CXXRecordDecl::markedVirtualFunctionPure() {
641 // C++ [class.abstract]p2:
642 // A class is abstract if it has at least one pure virtual function.
643 data().Abstract = true;
644}
645
646bool CXXRecordDecl::hasSubobjectAtOffsetZeroOfEmptyBaseType(
647 ASTContext &Ctx, const CXXRecordDecl *XFirst) {
648 if (!getNumBases())
649 return false;
650
651 llvm::SmallPtrSet<const CXXRecordDecl*, 8> Bases;
652 llvm::SmallPtrSet<const CXXRecordDecl*, 8> M;
653 SmallVector<const CXXRecordDecl*, 8> WorkList;
654
655 // Visit a type that we have determined is an element of M(S).
656 auto Visit = [&](const CXXRecordDecl *RD) -> bool {
657 RD = RD->getCanonicalDecl();
658
659 // C++2a [class]p8:
660 // A class S is a standard-layout class if it [...] has no element of the
661 // set M(S) of types as a base class.
662 //
663 // If we find a subobject of an empty type, it might also be a base class,
664 // so we'll need to walk the base classes to check.
665 if (!RD->data().HasBasesWithFields) {
666 // Walk the bases the first time, stopping if we find the type. Build a
667 // set of them so we don't need to walk them again.
668 if (Bases.empty()) {
669 bool RDIsBase = !forallBases(BaseMatches: [&](const CXXRecordDecl *Base) -> bool {
670 Base = Base->getCanonicalDecl();
671 if (RD == Base)
672 return false;
673 Bases.insert(Ptr: Base);
674 return true;
675 });
676 if (RDIsBase)
677 return true;
678 } else {
679 if (Bases.count(Ptr: RD))
680 return true;
681 }
682 }
683
684 if (M.insert(Ptr: RD).second)
685 WorkList.push_back(Elt: RD);
686 return false;
687 };
688
689 if (Visit(XFirst))
690 return true;
691
692 while (!WorkList.empty()) {
693 const CXXRecordDecl *X = WorkList.pop_back_val();
694
695 // FIXME: We don't check the bases of X. That matches the standard, but
696 // that sure looks like a wording bug.
697
698 // -- If X is a non-union class type with a non-static data member
699 // [recurse to each field] that is either of zero size or is the
700 // first non-static data member of X
701 // -- If X is a union type, [recurse to union members]
702 bool IsFirstField = true;
703 for (auto *FD : X->fields()) {
704 // FIXME: Should we really care about the type of the first non-static
705 // data member of a non-union if there are preceding unnamed bit-fields?
706 if (FD->isUnnamedBitField())
707 continue;
708
709 if (!IsFirstField && !FD->isZeroSize(Ctx))
710 continue;
711
712 if (FD->isInvalidDecl())
713 continue;
714
715 // -- If X is n array type, [visit the element type]
716 QualType T = Ctx.getBaseElementType(QT: FD->getType());
717 if (auto *RD = T->getAsCXXRecordDecl())
718 if (Visit(RD))
719 return true;
720
721 if (!X->isUnion())
722 IsFirstField = false;
723 }
724 }
725
726 return false;
727}
728
729bool CXXRecordDecl::lambdaIsDefaultConstructibleAndAssignable() const {
730 assert(isLambda() && "not a lambda");
731
732 // C++2a [expr.prim.lambda.capture]p11:
733 // The closure type associated with a lambda-expression has no default
734 // constructor if the lambda-expression has a lambda-capture and a
735 // defaulted default constructor otherwise. It has a deleted copy
736 // assignment operator if the lambda-expression has a lambda-capture and
737 // defaulted copy and move assignment operators otherwise.
738 //
739 // C++17 [expr.prim.lambda]p21:
740 // The closure type associated with a lambda-expression has no default
741 // constructor and a deleted copy assignment operator.
742 if (!isCapturelessLambda())
743 return false;
744 return getASTContext().getLangOpts().CPlusPlus20;
745}
746
747void CXXRecordDecl::addedMember(Decl *D) {
748 if (!D->isImplicit() && !isa<FieldDecl>(Val: D) && !isa<IndirectFieldDecl>(Val: D) &&
749 (!isa<TagDecl>(Val: D) ||
750 cast<TagDecl>(Val: D)->getTagKind() == TagTypeKind::Class ||
751 cast<TagDecl>(Val: D)->getTagKind() == TagTypeKind::Interface))
752 data().HasOnlyCMembers = false;
753
754 // Ignore friends and invalid declarations.
755 if (D->getFriendObjectKind() || D->isInvalidDecl())
756 return;
757
758 auto *FunTmpl = dyn_cast<FunctionTemplateDecl>(Val: D);
759 if (FunTmpl)
760 D = FunTmpl->getTemplatedDecl();
761
762 // FIXME: Pass NamedDecl* to addedMember?
763 Decl *DUnderlying = D;
764 if (auto *ND = dyn_cast<NamedDecl>(Val: DUnderlying)) {
765 DUnderlying = ND->getUnderlyingDecl();
766 if (auto *UnderlyingFunTmpl = dyn_cast<FunctionTemplateDecl>(Val: DUnderlying))
767 DUnderlying = UnderlyingFunTmpl->getTemplatedDecl();
768 }
769
770 if (const auto *Method = dyn_cast<CXXMethodDecl>(Val: D)) {
771 if (Method->isVirtual()) {
772 // C++ [dcl.init.aggr]p1:
773 // An aggregate is an array or a class with [...] no virtual functions.
774 data().Aggregate = false;
775
776 // C++ [class]p4:
777 // A POD-struct is an aggregate class...
778 data().PlainOldData = false;
779
780 // C++14 [meta.unary.prop]p4:
781 // T is a class type [...] with [...] no virtual member functions...
782 data().Empty = false;
783
784 // C++ [class.virtual]p1:
785 // A class that declares or inherits a virtual function is called a
786 // polymorphic class.
787 data().Polymorphic = true;
788
789 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
790 // A [default constructor, copy/move constructor, or copy/move
791 // assignment operator for a class X] is trivial [...] if:
792 // -- class X has no virtual functions [...]
793 data().HasTrivialSpecialMembers &= SMF_Destructor;
794 data().HasTrivialSpecialMembersForCall &= SMF_Destructor;
795
796 // C++0x [class]p7:
797 // A standard-layout class is a class that: [...]
798 // -- has no virtual functions
799 data().IsStandardLayout = false;
800 data().IsCXX11StandardLayout = false;
801 }
802 }
803
804 // Notify the listener if an implicit member was added after the definition
805 // was completed.
806 if (!isBeingDefined() && D->isImplicit())
807 if (ASTMutationListener *L = getASTMutationListener())
808 L->AddedCXXImplicitMember(RD: data().Definition, D);
809
810 // The kind of special member this declaration is, if any.
811 unsigned SMKind = 0;
812
813 // Handle constructors.
814 if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(Val: D)) {
815 if (Constructor->isInheritingConstructor()) {
816 // Ignore constructor shadow declarations. They are lazily created and
817 // so shouldn't affect any properties of the class.
818 } else {
819 if (!Constructor->isImplicit()) {
820 // Note that we have a user-declared constructor.
821 data().UserDeclaredConstructor = true;
822
823 const TargetInfo &TI = getASTContext().getTargetInfo();
824 if ((!Constructor->isDeleted() && !Constructor->isDefaulted()) ||
825 !TI.areDefaultedSMFStillPOD(getLangOpts())) {
826 // C++ [class]p4:
827 // A POD-struct is an aggregate class [...]
828 // Since the POD bit is meant to be C++03 POD-ness, clear it even if
829 // the type is technically an aggregate in C++0x since it wouldn't be
830 // in 03.
831 data().PlainOldData = false;
832 }
833 }
834
835 if (Constructor->isDefaultConstructor()) {
836 SMKind |= SMF_DefaultConstructor;
837
838 if (Constructor->isUserProvided())
839 data().UserProvidedDefaultConstructor = true;
840 if (Constructor->isConstexpr())
841 data().HasConstexprDefaultConstructor = true;
842 if (Constructor->isDefaulted())
843 data().HasDefaultedDefaultConstructor = true;
844 }
845
846 if (!FunTmpl) {
847 unsigned Quals;
848 if (Constructor->isCopyConstructor(TypeQuals&: Quals)) {
849 SMKind |= SMF_CopyConstructor;
850
851 if (Quals & Qualifiers::Const)
852 data().HasDeclaredCopyConstructorWithConstParam = true;
853 } else if (Constructor->isMoveConstructor())
854 SMKind |= SMF_MoveConstructor;
855 }
856
857 // C++11 [dcl.init.aggr]p1: DR1518
858 // An aggregate is an array or a class with no user-provided [or]
859 // explicit [...] constructors
860 // C++20 [dcl.init.aggr]p1:
861 // An aggregate is an array or a class with no user-declared [...]
862 // constructors
863 if (getASTContext().getLangOpts().CPlusPlus20
864 ? !Constructor->isImplicit()
865 : (Constructor->isUserProvided() || Constructor->isExplicit()))
866 data().Aggregate = false;
867 }
868 }
869
870 // Handle constructors, including those inherited from base classes.
871 if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(Val: DUnderlying)) {
872 // Record if we see any constexpr constructors which are neither copy
873 // nor move constructors.
874 // C++1z [basic.types]p10:
875 // [...] has at least one constexpr constructor or constructor template
876 // (possibly inherited from a base class) that is not a copy or move
877 // constructor [...]
878 if (Constructor->isConstexpr() && !Constructor->isCopyOrMoveConstructor())
879 data().HasConstexprNonCopyMoveConstructor = true;
880 if (!isa<CXXConstructorDecl>(Val: D) && Constructor->isDefaultConstructor())
881 data().HasInheritedDefaultConstructor = true;
882 }
883
884 // Handle member functions.
885 if (const auto *Method = dyn_cast<CXXMethodDecl>(Val: D)) {
886 if (isa<CXXDestructorDecl>(Val: D))
887 SMKind |= SMF_Destructor;
888
889 if (Method->isCopyAssignmentOperator()) {
890 SMKind |= SMF_CopyAssignment;
891
892 const auto *ParamTy =
893 Method->getNonObjectParameter(I: 0)->getType()->getAs<ReferenceType>();
894 if (!ParamTy || ParamTy->getPointeeType().isConstQualified())
895 data().HasDeclaredCopyAssignmentWithConstParam = true;
896 }
897
898 if (Method->isMoveAssignmentOperator())
899 SMKind |= SMF_MoveAssignment;
900
901 // Keep the list of conversion functions up-to-date.
902 if (auto *Conversion = dyn_cast<CXXConversionDecl>(Val: D)) {
903 // FIXME: We use the 'unsafe' accessor for the access specifier here,
904 // because Sema may not have set it yet. That's really just a misdesign
905 // in Sema. However, LLDB *will* have set the access specifier correctly,
906 // and adds declarations after the class is technically completed,
907 // so completeDefinition()'s overriding of the access specifiers doesn't
908 // work.
909 AccessSpecifier AS = Conversion->getAccessUnsafe();
910
911 if (Conversion->getPrimaryTemplate()) {
912 // We don't record specializations.
913 } else {
914 ASTContext &Ctx = getASTContext();
915 ASTUnresolvedSet &Conversions = data().Conversions.get(C&: Ctx);
916 NamedDecl *Primary =
917 FunTmpl ? cast<NamedDecl>(Val: FunTmpl) : cast<NamedDecl>(Val: Conversion);
918 if (Primary->getPreviousDecl())
919 Conversions.replace(Old: cast<NamedDecl>(Val: Primary->getPreviousDecl()),
920 New: Primary, AS);
921 else
922 Conversions.addDecl(C&: Ctx, D: Primary, AS);
923 }
924 }
925
926 if (SMKind) {
927 // If this is the first declaration of a special member, we no longer have
928 // an implicit trivial special member.
929 data().HasTrivialSpecialMembers &=
930 data().DeclaredSpecialMembers | ~SMKind;
931 data().HasTrivialSpecialMembersForCall &=
932 data().DeclaredSpecialMembers | ~SMKind;
933
934 // Note when we have declared a declared special member, and suppress the
935 // implicit declaration of this special member.
936 data().DeclaredSpecialMembers |= SMKind;
937 if (!Method->isImplicit()) {
938 data().UserDeclaredSpecialMembers |= SMKind;
939
940 const TargetInfo &TI = getASTContext().getTargetInfo();
941 if ((!Method->isDeleted() && !Method->isDefaulted() &&
942 SMKind != SMF_MoveAssignment) ||
943 !TI.areDefaultedSMFStillPOD(getLangOpts())) {
944 // C++03 [class]p4:
945 // A POD-struct is an aggregate class that has [...] no user-defined
946 // copy assignment operator and no user-defined destructor.
947 //
948 // Since the POD bit is meant to be C++03 POD-ness, and in C++03,
949 // aggregates could not have any constructors, clear it even for an
950 // explicitly defaulted or deleted constructor.
951 // type is technically an aggregate in C++0x since it wouldn't be in
952 // 03.
953 //
954 // Also, a user-declared move assignment operator makes a class
955 // non-POD. This is an extension in C++03.
956 data().PlainOldData = false;
957 }
958 }
959 // When instantiating a class, we delay updating the destructor and
960 // triviality properties of the class until selecting a destructor and
961 // computing the eligibility of its special member functions. This is
962 // because there might be function constraints that we need to evaluate
963 // and compare later in the instantiation.
964 if (!Method->isIneligibleOrNotSelected()) {
965 addedEligibleSpecialMemberFunction(MD: Method, SMKind);
966 }
967 }
968
969 return;
970 }
971
972 // Handle non-static data members.
973 if (const auto *Field = dyn_cast<FieldDecl>(Val: D)) {
974 ASTContext &Context = getASTContext();
975
976 // C++2a [class]p7:
977 // A standard-layout class is a class that:
978 // [...]
979 // -- has all non-static data members and bit-fields in the class and
980 // its base classes first declared in the same class
981 if (data().HasBasesWithFields)
982 data().IsStandardLayout = false;
983
984 // C++ [class.bit]p2:
985 // A declaration for a bit-field that omits the identifier declares an
986 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
987 // initialized.
988 if (Field->isUnnamedBitField()) {
989 // C++ [meta.unary.prop]p4: [LWG2358]
990 // T is a class type [...] with [...] no unnamed bit-fields of non-zero
991 // length
992 if (data().Empty && !Field->isZeroLengthBitField() &&
993 Context.getLangOpts().getClangABICompat() >
994 LangOptions::ClangABI::Ver6)
995 data().Empty = false;
996 return;
997 }
998
999 // C++11 [class]p7:
1000 // A standard-layout class is a class that:
1001 // -- either has no non-static data members in the most derived class
1002 // [...] or has no base classes with non-static data members
1003 if (data().HasBasesWithNonStaticDataMembers)
1004 data().IsCXX11StandardLayout = false;
1005
1006 // C++ [dcl.init.aggr]p1:
1007 // An aggregate is an array or a class (clause 9) with [...] no
1008 // private or protected non-static data members (clause 11).
1009 //
1010 // A POD must be an aggregate.
1011 if (D->getAccess() == AS_private || D->getAccess() == AS_protected) {
1012 data().Aggregate = false;
1013 data().PlainOldData = false;
1014
1015 // C++20 [temp.param]p7:
1016 // A structural type is [...] a literal class type [for which] all
1017 // non-static data members are public
1018 data().StructuralIfLiteral = false;
1019 }
1020
1021 // Track whether this is the first field. We use this when checking
1022 // whether the class is standard-layout below.
1023 bool IsFirstField = !data().HasPrivateFields &&
1024 !data().HasProtectedFields && !data().HasPublicFields;
1025
1026 // C++0x [class]p7:
1027 // A standard-layout class is a class that:
1028 // [...]
1029 // -- has the same access control for all non-static data members,
1030 switch (D->getAccess()) {
1031 case AS_private: data().HasPrivateFields = true; break;
1032 case AS_protected: data().HasProtectedFields = true; break;
1033 case AS_public: data().HasPublicFields = true; break;
1034 case AS_none: llvm_unreachable("Invalid access specifier");
1035 };
1036 if ((data().HasPrivateFields + data().HasProtectedFields +
1037 data().HasPublicFields) > 1) {
1038 data().IsStandardLayout = false;
1039 data().IsCXX11StandardLayout = false;
1040 }
1041
1042 // Keep track of the presence of mutable fields.
1043 if (Field->isMutable()) {
1044 data().HasMutableFields = true;
1045
1046 // C++20 [temp.param]p7:
1047 // A structural type is [...] a literal class type [for which] all
1048 // non-static data members are public
1049 data().StructuralIfLiteral = false;
1050 }
1051
1052 // C++11 [class.union]p8, DR1460:
1053 // If X is a union, a non-static data member of X that is not an anonymous
1054 // union is a variant member of X.
1055 if (isUnion() && !Field->isAnonymousStructOrUnion())
1056 data().HasVariantMembers = true;
1057
1058 if (isUnion() && IsFirstField)
1059 data().HasUninitializedFields = true;
1060
1061 // C++0x [class]p9:
1062 // A POD struct is a class that is both a trivial class and a
1063 // standard-layout class, and has no non-static data members of type
1064 // non-POD struct, non-POD union (or array of such types).
1065 //
1066 // Automatic Reference Counting: the presence of a member of Objective-C pointer type
1067 // that does not explicitly have no lifetime makes the class a non-POD.
1068 QualType T = Context.getBaseElementType(QT: Field->getType());
1069 if (T->isObjCRetainableType() || T.isObjCGCStrong()) {
1070 if (T.hasNonTrivialObjCLifetime()) {
1071 // Objective-C Automatic Reference Counting:
1072 // If a class has a non-static data member of Objective-C pointer
1073 // type (or array thereof), it is a non-POD type and its
1074 // default constructor (if any), copy constructor, move constructor,
1075 // copy assignment operator, move assignment operator, and destructor are
1076 // non-trivial.
1077 setHasObjectMember(true);
1078 struct DefinitionData &Data = data();
1079 Data.PlainOldData = false;
1080 Data.HasTrivialSpecialMembers = 0;
1081
1082 // __strong or __weak fields do not make special functions non-trivial
1083 // for the purpose of calls.
1084 Qualifiers::ObjCLifetime LT = T.getQualifiers().getObjCLifetime();
1085 if (LT != Qualifiers::OCL_Strong && LT != Qualifiers::OCL_Weak)
1086 data().HasTrivialSpecialMembersForCall = 0;
1087
1088 // Structs with __weak fields should never be passed directly.
1089 if (LT == Qualifiers::OCL_Weak)
1090 setArgPassingRestrictions(RecordArgPassingKind::CanNeverPassInRegs);
1091
1092 Data.HasIrrelevantDestructor = false;
1093
1094 if (isUnion()) {
1095 data().DefaultedCopyConstructorIsDeleted = true;
1096 data().DefaultedMoveConstructorIsDeleted = true;
1097 data().DefaultedCopyAssignmentIsDeleted = true;
1098 data().DefaultedMoveAssignmentIsDeleted = true;
1099 data().DefaultedDestructorIsDeleted = true;
1100 data().NeedOverloadResolutionForCopyConstructor = true;
1101 data().NeedOverloadResolutionForMoveConstructor = true;
1102 data().NeedOverloadResolutionForCopyAssignment = true;
1103 data().NeedOverloadResolutionForMoveAssignment = true;
1104 data().NeedOverloadResolutionForDestructor = true;
1105 }
1106 } else if (!Context.getLangOpts().ObjCAutoRefCount) {
1107 setHasObjectMember(true);
1108 }
1109 } else if (!T.isCXX98PODType(Context))
1110 data().PlainOldData = false;
1111
1112 // If a class has an address-discriminated signed pointer member, it is a
1113 // non-POD type and its copy constructor, move constructor, copy assignment
1114 // operator, move assignment operator are non-trivial.
1115 if (PointerAuthQualifier Q = T.getPointerAuth()) {
1116 if (Q.isAddressDiscriminated()) {
1117 struct DefinitionData &Data = data();
1118 Data.PlainOldData = false;
1119 Data.HasTrivialSpecialMembers &=
1120 ~(SMF_CopyConstructor | SMF_MoveConstructor | SMF_CopyAssignment |
1121 SMF_MoveAssignment);
1122 setArgPassingRestrictions(RecordArgPassingKind::CanNeverPassInRegs);
1123
1124 // Copy/move constructors/assignment operators of a union are deleted by
1125 // default if it has an address-discriminated ptrauth field.
1126 if (isUnion()) {
1127 data().DefaultedCopyConstructorIsDeleted = true;
1128 data().DefaultedMoveConstructorIsDeleted = true;
1129 data().DefaultedCopyAssignmentIsDeleted = true;
1130 data().DefaultedMoveAssignmentIsDeleted = true;
1131 data().NeedOverloadResolutionForCopyConstructor = true;
1132 data().NeedOverloadResolutionForMoveConstructor = true;
1133 data().NeedOverloadResolutionForCopyAssignment = true;
1134 data().NeedOverloadResolutionForMoveAssignment = true;
1135 }
1136 }
1137 }
1138
1139 if (Field->hasAttr<ExplicitInitAttr>())
1140 setHasUninitializedExplicitInitFields(true);
1141
1142 if (T->isReferenceType()) {
1143 if (!Field->hasInClassInitializer())
1144 data().HasUninitializedReferenceMember = true;
1145
1146 // C++0x [class]p7:
1147 // A standard-layout class is a class that:
1148 // -- has no non-static data members of type [...] reference,
1149 data().IsStandardLayout = false;
1150 data().IsCXX11StandardLayout = false;
1151
1152 // C++1z [class.copy.ctor]p10:
1153 // A defaulted copy constructor for a class X is defined as deleted if X has:
1154 // -- a non-static data member of rvalue reference type
1155 if (T->isRValueReferenceType())
1156 data().DefaultedCopyConstructorIsDeleted = true;
1157 }
1158
1159 if (isUnion() && !Field->isMutable()) {
1160 if (Field->hasInClassInitializer())
1161 data().HasUninitializedFields = false;
1162 } else if (!Field->hasInClassInitializer() && !Field->isMutable()) {
1163 if (CXXRecordDecl *FieldType = T->getAsCXXRecordDecl()) {
1164 if (FieldType->hasDefinition() && !FieldType->allowConstDefaultInit())
1165 data().HasUninitializedFields = true;
1166 } else {
1167 data().HasUninitializedFields = true;
1168 }
1169 }
1170
1171 // Record if this field is the first non-literal or volatile field or base.
1172 if (!T->isLiteralType(Ctx: Context) || T.isVolatileQualified())
1173 data().HasNonLiteralTypeFieldsOrBases = true;
1174
1175 if (Field->hasInClassInitializer() ||
1176 (Field->isAnonymousStructOrUnion() &&
1177 Field->getType()->getAsCXXRecordDecl()->hasInClassInitializer())) {
1178 data().HasInClassInitializer = true;
1179
1180 // C++11 [class]p5:
1181 // A default constructor is trivial if [...] no non-static data member
1182 // of its class has a brace-or-equal-initializer.
1183 data().HasTrivialSpecialMembers &= ~SMF_DefaultConstructor;
1184
1185 // C++11 [dcl.init.aggr]p1:
1186 // An aggregate is a [...] class with [...] no
1187 // brace-or-equal-initializers for non-static data members.
1188 //
1189 // This rule was removed in C++14.
1190 if (!getASTContext().getLangOpts().CPlusPlus14)
1191 data().Aggregate = false;
1192
1193 // C++11 [class]p10:
1194 // A POD struct is [...] a trivial class.
1195 data().PlainOldData = false;
1196 }
1197
1198 // C++11 [class.copy]p23:
1199 // A defaulted copy/move assignment operator for a class X is defined
1200 // as deleted if X has:
1201 // -- a non-static data member of reference type
1202 if (T->isReferenceType()) {
1203 data().DefaultedCopyAssignmentIsDeleted = true;
1204 data().DefaultedMoveAssignmentIsDeleted = true;
1205 }
1206
1207 // Bitfields of length 0 are also zero-sized, but we already bailed out for
1208 // those because they are always unnamed.
1209 bool IsZeroSize = Field->isZeroSize(Ctx: Context);
1210
1211 if (auto *FieldRec = T->getAsCXXRecordDecl()) {
1212 if (FieldRec->isBeingDefined() || FieldRec->isCompleteDefinition()) {
1213 addedClassSubobject(Subobj: FieldRec);
1214
1215 // We may need to perform overload resolution to determine whether a
1216 // field can be moved if it's const or volatile qualified.
1217 if (T.getCVRQualifiers() & (Qualifiers::Const | Qualifiers::Volatile)) {
1218 // We need to care about 'const' for the copy constructor because an
1219 // implicit copy constructor might be declared with a non-const
1220 // parameter.
1221 data().NeedOverloadResolutionForCopyConstructor = true;
1222 data().NeedOverloadResolutionForMoveConstructor = true;
1223 data().NeedOverloadResolutionForCopyAssignment = true;
1224 data().NeedOverloadResolutionForMoveAssignment = true;
1225 }
1226
1227 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
1228 // A defaulted [special member] for a class X is defined as
1229 // deleted if:
1230 // -- X is a union-like class that has a variant member with a
1231 // non-trivial [corresponding special member]
1232 if (isUnion()) {
1233 if (FieldRec->hasNonTrivialCopyConstructor())
1234 data().DefaultedCopyConstructorIsDeleted = true;
1235 if (FieldRec->hasNonTrivialMoveConstructor())
1236 data().DefaultedMoveConstructorIsDeleted = true;
1237 if (FieldRec->hasNonTrivialCopyAssignment())
1238 data().DefaultedCopyAssignmentIsDeleted = true;
1239 if (FieldRec->hasNonTrivialMoveAssignment())
1240 data().DefaultedMoveAssignmentIsDeleted = true;
1241 if (FieldRec->hasNonTrivialDestructor()) {
1242 data().DefaultedDestructorIsDeleted = true;
1243 // C++20 [dcl.constexpr]p5:
1244 // The definition of a constexpr destructor whose function-body is
1245 // not = delete shall additionally satisfy...
1246 data().DefaultedDestructorIsConstexpr = true;
1247 }
1248 }
1249
1250 // For an anonymous union member, our overload resolution will perform
1251 // overload resolution for its members.
1252 if (Field->isAnonymousStructOrUnion()) {
1253 data().NeedOverloadResolutionForCopyConstructor |=
1254 FieldRec->data().NeedOverloadResolutionForCopyConstructor;
1255 data().NeedOverloadResolutionForMoveConstructor |=
1256 FieldRec->data().NeedOverloadResolutionForMoveConstructor;
1257 data().NeedOverloadResolutionForCopyAssignment |=
1258 FieldRec->data().NeedOverloadResolutionForCopyAssignment;
1259 data().NeedOverloadResolutionForMoveAssignment |=
1260 FieldRec->data().NeedOverloadResolutionForMoveAssignment;
1261 data().NeedOverloadResolutionForDestructor |=
1262 FieldRec->data().NeedOverloadResolutionForDestructor;
1263 }
1264
1265 // C++0x [class.ctor]p5:
1266 // A default constructor is trivial [...] if:
1267 // -- for all the non-static data members of its class that are of
1268 // class type (or array thereof), each such class has a trivial
1269 // default constructor.
1270 if (!FieldRec->hasTrivialDefaultConstructor())
1271 data().HasTrivialSpecialMembers &= ~SMF_DefaultConstructor;
1272
1273 // C++0x [class.copy]p13:
1274 // A copy/move constructor for class X is trivial if [...]
1275 // [...]
1276 // -- for each non-static data member of X that is of class type (or
1277 // an array thereof), the constructor selected to copy/move that
1278 // member is trivial;
1279 if (!FieldRec->hasTrivialCopyConstructor())
1280 data().HasTrivialSpecialMembers &= ~SMF_CopyConstructor;
1281
1282 if (!FieldRec->hasTrivialCopyConstructorForCall())
1283 data().HasTrivialSpecialMembersForCall &= ~SMF_CopyConstructor;
1284
1285 // If the field doesn't have a simple move constructor, we'll eagerly
1286 // declare the move constructor for this class and we'll decide whether
1287 // it's trivial then.
1288 if (!FieldRec->hasTrivialMoveConstructor())
1289 data().HasTrivialSpecialMembers &= ~SMF_MoveConstructor;
1290
1291 if (!FieldRec->hasTrivialMoveConstructorForCall())
1292 data().HasTrivialSpecialMembersForCall &= ~SMF_MoveConstructor;
1293
1294 // C++0x [class.copy]p27:
1295 // A copy/move assignment operator for class X is trivial if [...]
1296 // [...]
1297 // -- for each non-static data member of X that is of class type (or
1298 // an array thereof), the assignment operator selected to
1299 // copy/move that member is trivial;
1300 if (!FieldRec->hasTrivialCopyAssignment())
1301 data().HasTrivialSpecialMembers &= ~SMF_CopyAssignment;
1302 // If the field doesn't have a simple move assignment, we'll eagerly
1303 // declare the move assignment for this class and we'll decide whether
1304 // it's trivial then.
1305 if (!FieldRec->hasTrivialMoveAssignment())
1306 data().HasTrivialSpecialMembers &= ~SMF_MoveAssignment;
1307
1308 if (!FieldRec->hasTrivialDestructor())
1309 data().HasTrivialSpecialMembers &= ~SMF_Destructor;
1310 if (!FieldRec->hasTrivialDestructorForCall())
1311 data().HasTrivialSpecialMembersForCall &= ~SMF_Destructor;
1312 if (!FieldRec->hasIrrelevantDestructor())
1313 data().HasIrrelevantDestructor = false;
1314 if (FieldRec->isAnyDestructorNoReturn())
1315 data().IsAnyDestructorNoReturn = true;
1316 if (FieldRec->hasObjectMember())
1317 setHasObjectMember(true);
1318 if (FieldRec->hasVolatileMember())
1319 setHasVolatileMember(true);
1320 if (FieldRec->getArgPassingRestrictions() ==
1321 RecordArgPassingKind::CanNeverPassInRegs)
1322 setArgPassingRestrictions(RecordArgPassingKind::CanNeverPassInRegs);
1323
1324 // C++0x [class]p7:
1325 // A standard-layout class is a class that:
1326 // -- has no non-static data members of type non-standard-layout
1327 // class (or array of such types) [...]
1328 if (!FieldRec->isStandardLayout())
1329 data().IsStandardLayout = false;
1330 if (!FieldRec->isCXX11StandardLayout())
1331 data().IsCXX11StandardLayout = false;
1332
1333 // C++2a [class]p7:
1334 // A standard-layout class is a class that:
1335 // [...]
1336 // -- has no element of the set M(S) of types as a base class.
1337 if (data().IsStandardLayout &&
1338 (isUnion() || IsFirstField || IsZeroSize) &&
1339 hasSubobjectAtOffsetZeroOfEmptyBaseType(Ctx&: Context, XFirst: FieldRec))
1340 data().IsStandardLayout = false;
1341
1342 // C++11 [class]p7:
1343 // A standard-layout class is a class that:
1344 // -- has no base classes of the same type as the first non-static
1345 // data member
1346 if (data().IsCXX11StandardLayout && IsFirstField) {
1347 // FIXME: We should check all base classes here, not just direct
1348 // base classes.
1349 for (const auto &BI : bases()) {
1350 if (Context.hasSameUnqualifiedType(T1: BI.getType(), T2: T)) {
1351 data().IsCXX11StandardLayout = false;
1352 break;
1353 }
1354 }
1355 }
1356
1357 // Keep track of the presence of mutable fields.
1358 if (FieldRec->hasMutableFields())
1359 data().HasMutableFields = true;
1360
1361 if (Field->isMutable()) {
1362 // Our copy constructor/assignment might call something other than
1363 // the subobject's copy constructor/assignment if it's mutable and of
1364 // class type.
1365 data().NeedOverloadResolutionForCopyConstructor = true;
1366 data().NeedOverloadResolutionForCopyAssignment = true;
1367 }
1368
1369 // C++11 [class.copy]p13:
1370 // If the implicitly-defined constructor would satisfy the
1371 // requirements of a constexpr constructor, the implicitly-defined
1372 // constructor is constexpr.
1373 // C++11 [dcl.constexpr]p4:
1374 // -- every constructor involved in initializing non-static data
1375 // members [...] shall be a constexpr constructor
1376 if (!Field->hasInClassInitializer() &&
1377 !FieldRec->hasConstexprDefaultConstructor() && !isUnion())
1378 // The standard requires any in-class initializer to be a constant
1379 // expression. We consider this to be a defect.
1380 data().DefaultedDefaultConstructorIsConstexpr =
1381 Context.getLangOpts().CPlusPlus23;
1382
1383 // C++11 [class.copy]p8:
1384 // The implicitly-declared copy constructor for a class X will have
1385 // the form 'X::X(const X&)' if each potentially constructed subobject
1386 // of a class type M (or array thereof) has a copy constructor whose
1387 // first parameter is of type 'const M&' or 'const volatile M&'.
1388 if (!FieldRec->hasCopyConstructorWithConstParam())
1389 data().ImplicitCopyConstructorCanHaveConstParamForNonVBase = false;
1390
1391 // C++11 [class.copy]p18:
1392 // The implicitly-declared copy assignment oeprator for a class X will
1393 // have the form 'X& X::operator=(const X&)' if [...] for all the
1394 // non-static data members of X that are of a class type M (or array
1395 // thereof), each such class type has a copy assignment operator whose
1396 // parameter is of type 'const M&', 'const volatile M&' or 'M'.
1397 if (!FieldRec->hasCopyAssignmentWithConstParam())
1398 data().ImplicitCopyAssignmentHasConstParam = false;
1399
1400 if (FieldRec->hasUninitializedExplicitInitFields() &&
1401 FieldRec->isAggregate())
1402 setHasUninitializedExplicitInitFields(true);
1403
1404 if (FieldRec->hasUninitializedReferenceMember() &&
1405 !Field->hasInClassInitializer())
1406 data().HasUninitializedReferenceMember = true;
1407
1408 // C++11 [class.union]p8, DR1460:
1409 // a non-static data member of an anonymous union that is a member of
1410 // X is also a variant member of X.
1411 if (FieldRec->hasVariantMembers() &&
1412 Field->isAnonymousStructOrUnion())
1413 data().HasVariantMembers = true;
1414
1415 if (FieldRec->isPFPType())
1416 data().IsPFPType = true;
1417 }
1418 } else {
1419 // Base element type of field is a non-class type.
1420 if (!T->isLiteralType(Ctx: Context) ||
1421 (!Field->hasInClassInitializer() && !isUnion() &&
1422 !Context.getLangOpts().CPlusPlus20))
1423 data().DefaultedDefaultConstructorIsConstexpr = false;
1424
1425 // C++11 [class.copy]p23:
1426 // A defaulted copy/move assignment operator for a class X is defined
1427 // as deleted if X has:
1428 // -- a non-static data member of const non-class type (or array
1429 // thereof)
1430 if (T.isConstQualified()) {
1431 data().DefaultedCopyAssignmentIsDeleted = true;
1432 data().DefaultedMoveAssignmentIsDeleted = true;
1433 }
1434
1435 // C++20 [temp.param]p7:
1436 // A structural type is [...] a literal class type [for which] the
1437 // types of all non-static data members are structural types or
1438 // (possibly multidimensional) array thereof
1439 // We deal with class types elsewhere.
1440 if (!T->isStructuralType())
1441 data().StructuralIfLiteral = false;
1442 }
1443
1444 // If this type contains any address discriminated values we should
1445 // have already indicated that the only special member functions that
1446 // can possibly be trivial are the default constructor and destructor.
1447 if (T.hasAddressDiscriminatedPointerAuth())
1448 data().HasTrivialSpecialMembers &=
1449 SMF_DefaultConstructor | SMF_Destructor;
1450
1451 // C++14 [meta.unary.prop]p4:
1452 // T is a class type [...] with [...] no non-static data members other
1453 // than subobjects of zero size
1454 if (data().Empty && !IsZeroSize)
1455 data().Empty = false;
1456
1457 if (getLangOpts().HLSL) {
1458 const Type *Ty = Field->getType()->getUnqualifiedDesugaredType();
1459 while (isa<ConstantArrayType>(Val: Ty))
1460 Ty = Ty->getArrayElementTypeNoTypeQual();
1461
1462 Ty = Ty->getUnqualifiedDesugaredType();
1463 if (const RecordType *RT = dyn_cast<RecordType>(Val: Ty))
1464 data().IsHLSLIntangible |= RT->getAsCXXRecordDecl()->isHLSLIntangible();
1465 else
1466 data().IsHLSLIntangible |= (Ty->isHLSLAttributedResourceType() ||
1467 Ty->isHLSLBuiltinIntangibleType());
1468 }
1469 }
1470
1471 // Handle using declarations of conversion functions.
1472 if (auto *Shadow = dyn_cast<UsingShadowDecl>(Val: D)) {
1473 if (Shadow->getDeclName().getNameKind()
1474 == DeclarationName::CXXConversionFunctionName) {
1475 ASTContext &Ctx = getASTContext();
1476 data().Conversions.get(C&: Ctx).addDecl(C&: Ctx, D: Shadow, AS: Shadow->getAccess());
1477 }
1478 }
1479
1480 if (const auto *Using = dyn_cast<UsingDecl>(Val: D)) {
1481 if (Using->getDeclName().getNameKind() ==
1482 DeclarationName::CXXConstructorName) {
1483 data().HasInheritedConstructor = true;
1484 // C++1z [dcl.init.aggr]p1:
1485 // An aggregate is [...] a class [...] with no inherited constructors
1486 data().Aggregate = false;
1487 }
1488
1489 if (Using->getDeclName().getCXXOverloadedOperator() == OO_Equal)
1490 data().HasInheritedAssignment = true;
1491 }
1492
1493 // HLSL: All user-defined data types are aggregates and use aggregate
1494 // initialization, meanwhile most, but not all built-in types behave like
1495 // aggregates. Resource types, and some other HLSL types that wrap handles
1496 // don't behave like aggregates. We can identify these as different because we
1497 // implicitly define "special" member functions, which aren't spellable in
1498 // HLSL. This all _needs_ to change in the future. There are two
1499 // relevant HLSL feature proposals that will depend on this changing:
1500 // * 0005-strict-initializer-lists.md
1501 // * https://github.com/microsoft/hlsl-specs/pull/325
1502 if (getLangOpts().HLSL)
1503 data().Aggregate = data().UserDeclaredSpecialMembers == 0;
1504}
1505
1506bool CXXRecordDecl::isLiteral() const {
1507 const LangOptions &LangOpts = getLangOpts();
1508 if (!(LangOpts.CPlusPlus20 ? hasConstexprDestructor()
1509 : hasTrivialDestructor()))
1510 return false;
1511
1512 if (hasNonLiteralTypeFieldsOrBases()) {
1513 // CWG2598
1514 // is an aggregate union type that has either no variant
1515 // members or at least one variant member of non-volatile literal type,
1516 if (!isUnion())
1517 return false;
1518 bool HasAtLeastOneLiteralMember =
1519 fields().empty() || any_of(Range: fields(), P: [this](const FieldDecl *D) {
1520 return !D->getType().isVolatileQualified() &&
1521 D->getType()->isLiteralType(Ctx: getASTContext());
1522 });
1523 if (!HasAtLeastOneLiteralMember)
1524 return false;
1525 }
1526
1527 return isAggregate() || (isLambda() && LangOpts.CPlusPlus17) ||
1528 hasConstexprNonCopyMoveConstructor() || hasTrivialDefaultConstructor();
1529}
1530
1531void CXXRecordDecl::addedSelectedDestructor(CXXDestructorDecl *DD) {
1532 DD->setIneligibleOrNotSelected(false);
1533 addedEligibleSpecialMemberFunction(MD: DD, SMKind: SMF_Destructor);
1534}
1535
1536void CXXRecordDecl::addedEligibleSpecialMemberFunction(const CXXMethodDecl *MD,
1537 unsigned SMKind) {
1538 // FIXME: We shouldn't change DeclaredNonTrivialSpecialMembers if `MD` is
1539 // a function template, but this needs CWG attention before we break ABI.
1540 // See https://github.com/llvm/llvm-project/issues/59206
1541
1542 if (const auto *DD = dyn_cast<CXXDestructorDecl>(Val: MD)) {
1543 if (DD->isUserProvided())
1544 data().HasIrrelevantDestructor = false;
1545 // If the destructor is explicitly defaulted and not trivial or not public
1546 // or if the destructor is deleted, we clear HasIrrelevantDestructor in
1547 // finishedDefaultedOrDeletedMember.
1548
1549 // C++11 [class.dtor]p5:
1550 // A destructor is trivial if [...] the destructor is not virtual.
1551 if (DD->isVirtual()) {
1552 data().HasTrivialSpecialMembers &= ~SMF_Destructor;
1553 data().HasTrivialSpecialMembersForCall &= ~SMF_Destructor;
1554 }
1555
1556 if (DD->isNoReturn())
1557 data().IsAnyDestructorNoReturn = true;
1558 }
1559 if (!MD->isImplicit() && !MD->isUserProvided()) {
1560 // This method is user-declared but not user-provided. We can't work
1561 // out whether it's trivial yet (not until we get to the end of the
1562 // class). We'll handle this method in
1563 // finishedDefaultedOrDeletedMember.
1564 } else if (MD->isTrivial()) {
1565 data().HasTrivialSpecialMembers |= SMKind;
1566 data().HasTrivialSpecialMembersForCall |= SMKind;
1567 } else if (MD->isTrivialForCall()) {
1568 data().HasTrivialSpecialMembersForCall |= SMKind;
1569 data().DeclaredNonTrivialSpecialMembers |= SMKind;
1570 } else {
1571 data().DeclaredNonTrivialSpecialMembers |= SMKind;
1572 // If this is a user-provided function, do not set
1573 // DeclaredNonTrivialSpecialMembersForCall here since we don't know
1574 // yet whether the method would be considered non-trivial for the
1575 // purpose of calls (attribute "trivial_abi" can be dropped from the
1576 // class later, which can change the special method's triviality).
1577 if (!MD->isUserProvided())
1578 data().DeclaredNonTrivialSpecialMembersForCall |= SMKind;
1579 }
1580}
1581
1582void CXXRecordDecl::finishedDefaultedOrDeletedMember(CXXMethodDecl *D) {
1583 assert(!D->isImplicit() && !D->isUserProvided());
1584
1585 // The kind of special member this declaration is, if any.
1586 unsigned SMKind = 0;
1587
1588 if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(Val: D)) {
1589 if (Constructor->isDefaultConstructor()) {
1590 SMKind |= SMF_DefaultConstructor;
1591 if (Constructor->isConstexpr())
1592 data().HasConstexprDefaultConstructor = true;
1593 }
1594 if (Constructor->isCopyConstructor())
1595 SMKind |= SMF_CopyConstructor;
1596 else if (Constructor->isMoveConstructor())
1597 SMKind |= SMF_MoveConstructor;
1598 else if (Constructor->isConstexpr())
1599 // We may now know that the constructor is constexpr.
1600 data().HasConstexprNonCopyMoveConstructor = true;
1601 } else if (isa<CXXDestructorDecl>(Val: D)) {
1602 SMKind |= SMF_Destructor;
1603 if (!D->isTrivial() || D->getAccess() != AS_public || D->isDeleted())
1604 data().HasIrrelevantDestructor = false;
1605 } else if (D->isCopyAssignmentOperator())
1606 SMKind |= SMF_CopyAssignment;
1607 else if (D->isMoveAssignmentOperator())
1608 SMKind |= SMF_MoveAssignment;
1609
1610 // Update which trivial / non-trivial special members we have.
1611 // addedMember will have skipped this step for this member.
1612 if (!D->isIneligibleOrNotSelected()) {
1613 if (D->isTrivial())
1614 data().HasTrivialSpecialMembers |= SMKind;
1615 else
1616 data().DeclaredNonTrivialSpecialMembers |= SMKind;
1617 }
1618}
1619
1620void CXXRecordDecl::LambdaDefinitionData::AddCaptureList(ASTContext &Ctx,
1621 Capture *CaptureList) {
1622 Captures.push_back(NewVal: CaptureList);
1623 if (Captures.size() == 2) {
1624 // The TinyPtrVector member now needs destruction.
1625 Ctx.addDestruction(Ptr: &Captures);
1626 }
1627}
1628
1629void CXXRecordDecl::setCaptures(ASTContext &Context,
1630 ArrayRef<LambdaCapture> Captures) {
1631 CXXRecordDecl::LambdaDefinitionData &Data = getLambdaData();
1632
1633 // Copy captures.
1634 Data.NumCaptures = Captures.size();
1635 Data.NumExplicitCaptures = 0;
1636 auto *ToCapture = (LambdaCapture *)Context.Allocate(Size: sizeof(LambdaCapture) *
1637 Captures.size());
1638 Data.AddCaptureList(Ctx&: Context, CaptureList: ToCapture);
1639 for (const LambdaCapture &C : Captures) {
1640 if (C.isExplicit())
1641 ++Data.NumExplicitCaptures;
1642
1643 new (ToCapture) LambdaCapture(C);
1644 ToCapture++;
1645 }
1646
1647 if (!lambdaIsDefaultConstructibleAndAssignable())
1648 Data.DefaultedCopyAssignmentIsDeleted = true;
1649}
1650
1651void CXXRecordDecl::setTrivialForCallFlags(CXXMethodDecl *D) {
1652 unsigned SMKind = 0;
1653
1654 if (const auto *Constructor = dyn_cast<CXXConstructorDecl>(Val: D)) {
1655 if (Constructor->isCopyConstructor())
1656 SMKind = SMF_CopyConstructor;
1657 else if (Constructor->isMoveConstructor())
1658 SMKind = SMF_MoveConstructor;
1659 } else if (isa<CXXDestructorDecl>(Val: D))
1660 SMKind = SMF_Destructor;
1661
1662 if (D->isTrivialForCall())
1663 data().HasTrivialSpecialMembersForCall |= SMKind;
1664 else
1665 data().DeclaredNonTrivialSpecialMembersForCall |= SMKind;
1666}
1667
1668bool CXXRecordDecl::isCLike() const {
1669 if (getTagKind() == TagTypeKind::Class ||
1670 getTagKind() == TagTypeKind::Interface ||
1671 !TemplateOrInstantiation.isNull())
1672 return false;
1673 if (!hasDefinition())
1674 return true;
1675
1676 return isPOD() && data().HasOnlyCMembers;
1677}
1678
1679bool CXXRecordDecl::isGenericLambda() const {
1680 if (!isLambda()) return false;
1681 return getLambdaData().IsGenericLambda;
1682}
1683
1684#ifndef NDEBUG
1685static bool allLookupResultsAreTheSame(const DeclContext::lookup_result &R) {
1686 return llvm::all_of(R, [&](NamedDecl *D) {
1687 return D->isInvalidDecl() || declaresSameEntity(D, R.front());
1688 });
1689}
1690#endif
1691
1692static NamedDecl* getLambdaCallOperatorHelper(const CXXRecordDecl &RD) {
1693 if (!RD.isLambda()) return nullptr;
1694 DeclarationName Name =
1695 RD.getASTContext().DeclarationNames.getCXXOperatorName(Op: OO_Call);
1696
1697 DeclContext::lookup_result Calls = RD.lookup(Name);
1698
1699 // This can happen while building the lambda.
1700 if (Calls.empty())
1701 return nullptr;
1702
1703 assert(allLookupResultsAreTheSame(Calls) &&
1704 "More than one lambda call operator!");
1705
1706 // FIXME: If we have multiple call operators, we might be in a situation
1707 // where we merged this lambda with one from another module; in that
1708 // case, return our method (instead of that of the other lambda).
1709 //
1710 // This avoids situations where, given two modules A and B, if we
1711 // try to instantiate A's call operator in a function in B, anything
1712 // in the call operator that relies on local decls in the surrounding
1713 // function will crash because it tries to find A's decls, but we only
1714 // instantiated B's:
1715 //
1716 // template <typename>
1717 // void f() {
1718 // using T = int; // We only instantiate B's version of this.
1719 // auto L = [](T) { }; // But A's call operator would want A's here.
1720 // }
1721 //
1722 // Walk the call operator’s redecl chain to find the one that belongs
1723 // to this module.
1724 //
1725 // TODO: We need to fix this properly (see
1726 // https://github.com/llvm/llvm-project/issues/90154).
1727 Module *M = RD.getOwningModule();
1728 for (Decl *D : Calls.front()->redecls()) {
1729 auto *MD = cast<NamedDecl>(Val: D);
1730 if (MD->getOwningModule() == M)
1731 return MD;
1732 }
1733
1734 llvm_unreachable("Couldn't find our call operator!");
1735}
1736
1737FunctionTemplateDecl* CXXRecordDecl::getDependentLambdaCallOperator() const {
1738 NamedDecl *CallOp = getLambdaCallOperatorHelper(RD: *this);
1739 return dyn_cast_or_null<FunctionTemplateDecl>(Val: CallOp);
1740}
1741
1742CXXMethodDecl *CXXRecordDecl::getLambdaCallOperator() const {
1743 NamedDecl *CallOp = getLambdaCallOperatorHelper(RD: *this);
1744
1745 if (CallOp == nullptr)
1746 return nullptr;
1747
1748 if (const auto *CallOpTmpl = dyn_cast<FunctionTemplateDecl>(Val: CallOp))
1749 return cast<CXXMethodDecl>(Val: CallOpTmpl->getTemplatedDecl());
1750
1751 return cast<CXXMethodDecl>(Val: CallOp);
1752}
1753
1754CXXMethodDecl* CXXRecordDecl::getLambdaStaticInvoker() const {
1755 CXXMethodDecl *CallOp = getLambdaCallOperator();
1756 assert(CallOp && "null call operator");
1757 CallingConv CC = CallOp->getType()->castAs<FunctionType>()->getCallConv();
1758 return getLambdaStaticInvoker(CC);
1759}
1760
1761static DeclContext::lookup_result
1762getLambdaStaticInvokers(const CXXRecordDecl &RD) {
1763 assert(RD.isLambda() && "Must be a lambda");
1764 DeclarationName Name =
1765 &RD.getASTContext().Idents.get(Name: getLambdaStaticInvokerName());
1766 return RD.lookup(Name);
1767}
1768
1769static CXXMethodDecl *getInvokerAsMethod(NamedDecl *ND) {
1770 if (const auto *InvokerTemplate = dyn_cast<FunctionTemplateDecl>(Val: ND))
1771 return cast<CXXMethodDecl>(Val: InvokerTemplate->getTemplatedDecl());
1772 return cast<CXXMethodDecl>(Val: ND);
1773}
1774
1775CXXMethodDecl *CXXRecordDecl::getLambdaStaticInvoker(CallingConv CC) const {
1776 if (!isLambda())
1777 return nullptr;
1778 DeclContext::lookup_result Invoker = getLambdaStaticInvokers(RD: *this);
1779
1780 for (NamedDecl *ND : Invoker) {
1781 const auto *FTy =
1782 cast<ValueDecl>(Val: ND->getAsFunction())->getType()->castAs<FunctionType>();
1783 if (FTy->getCallConv() == CC)
1784 return getInvokerAsMethod(ND);
1785 }
1786
1787 return nullptr;
1788}
1789
1790void CXXRecordDecl::getCaptureFields(
1791 llvm::DenseMap<const ValueDecl *, FieldDecl *> &Captures,
1792 FieldDecl *&ThisCapture) const {
1793 Captures.clear();
1794 ThisCapture = nullptr;
1795
1796 LambdaDefinitionData &Lambda = getLambdaData();
1797 for (const LambdaCapture *List : Lambda.Captures) {
1798 RecordDecl::field_iterator Field = field_begin();
1799 for (const LambdaCapture *C = List, *CEnd = C + Lambda.NumCaptures;
1800 C != CEnd; ++C, ++Field) {
1801 if (C->capturesThis())
1802 ThisCapture = *Field;
1803 else if (C->capturesVariable())
1804 Captures[C->getCapturedVar()] = *Field;
1805 }
1806 assert(Field == field_end());
1807 }
1808}
1809
1810TemplateParameterList *
1811CXXRecordDecl::getGenericLambdaTemplateParameterList() const {
1812 if (!isGenericLambda()) return nullptr;
1813 CXXMethodDecl *CallOp = getLambdaCallOperator();
1814 if (FunctionTemplateDecl *Tmpl = CallOp->getDescribedFunctionTemplate())
1815 return Tmpl->getTemplateParameters();
1816 return nullptr;
1817}
1818
1819ArrayRef<NamedDecl *>
1820CXXRecordDecl::getLambdaExplicitTemplateParameters() const {
1821 TemplateParameterList *List = getGenericLambdaTemplateParameterList();
1822 if (!List)
1823 return {};
1824
1825 assert(std::is_partitioned(List->begin(), List->end(),
1826 [](const NamedDecl *D) { return !D->isImplicit(); })
1827 && "Explicit template params should be ordered before implicit ones");
1828
1829 const auto ExplicitEnd = llvm::partition_point(
1830 Range&: *List, P: [](const NamedDecl *D) { return !D->isImplicit(); });
1831 return ArrayRef(List->begin(), ExplicitEnd);
1832}
1833
1834Decl *CXXRecordDecl::getLambdaContextDecl() const {
1835 assert(isLambda() && "Not a lambda closure type!");
1836 ExternalASTSource *Source = getParentASTContext().getExternalSource();
1837 return getLambdaData().ContextDecl.get(Source);
1838}
1839
1840void CXXRecordDecl::setLambdaNumbering(LambdaNumbering Numbering) {
1841 assert(isLambda() && "Not a lambda closure type!");
1842 getLambdaData().ManglingNumber = Numbering.ManglingNumber;
1843 if (Numbering.DeviceManglingNumber)
1844 getASTContext().DeviceLambdaManglingNumbers[this] =
1845 Numbering.DeviceManglingNumber;
1846 getLambdaData().IndexInContext = Numbering.IndexInContext;
1847 getLambdaData().ContextDecl = Numbering.ContextDecl;
1848 getLambdaData().HasKnownInternalLinkage = Numbering.HasKnownInternalLinkage;
1849}
1850
1851unsigned CXXRecordDecl::getDeviceLambdaManglingNumber() const {
1852 assert(isLambda() && "Not a lambda closure type!");
1853 return getASTContext().DeviceLambdaManglingNumbers.lookup(Val: this);
1854}
1855
1856static CanQualType GetConversionType(ASTContext &Context, NamedDecl *Conv) {
1857 QualType T =
1858 cast<CXXConversionDecl>(Val: Conv->getUnderlyingDecl()->getAsFunction())
1859 ->getConversionType();
1860 return Context.getCanonicalType(T);
1861}
1862
1863/// Collect the visible conversions of a base class.
1864///
1865/// \param Record a base class of the class we're considering
1866/// \param InVirtual whether this base class is a virtual base (or a base
1867/// of a virtual base)
1868/// \param Access the access along the inheritance path to this base
1869/// \param ParentHiddenTypes the conversions provided by the inheritors
1870/// of this base
1871/// \param Output the set to which to add conversions from non-virtual bases
1872/// \param VOutput the set to which to add conversions from virtual bases
1873/// \param HiddenVBaseCs the set of conversions which were hidden in a
1874/// virtual base along some inheritance path
1875static void CollectVisibleConversions(
1876 ASTContext &Context, const CXXRecordDecl *Record, bool InVirtual,
1877 AccessSpecifier Access,
1878 const llvm::SmallPtrSet<CanQualType, 8> &ParentHiddenTypes,
1879 ASTUnresolvedSet &Output, UnresolvedSetImpl &VOutput,
1880 llvm::SmallPtrSet<NamedDecl *, 8> &HiddenVBaseCs) {
1881 // The set of types which have conversions in this class or its
1882 // subclasses. As an optimization, we don't copy the derived set
1883 // unless it might change.
1884 const llvm::SmallPtrSet<CanQualType, 8> *HiddenTypes = &ParentHiddenTypes;
1885 llvm::SmallPtrSet<CanQualType, 8> HiddenTypesBuffer;
1886
1887 // Collect the direct conversions and figure out which conversions
1888 // will be hidden in the subclasses.
1889 CXXRecordDecl::conversion_iterator ConvI = Record->conversion_begin();
1890 CXXRecordDecl::conversion_iterator ConvE = Record->conversion_end();
1891 if (ConvI != ConvE) {
1892 HiddenTypesBuffer = ParentHiddenTypes;
1893 HiddenTypes = &HiddenTypesBuffer;
1894
1895 for (CXXRecordDecl::conversion_iterator I = ConvI; I != ConvE; ++I) {
1896 CanQualType ConvType(GetConversionType(Context, Conv: I.getDecl()));
1897 bool Hidden = ParentHiddenTypes.count(Ptr: ConvType);
1898 if (!Hidden)
1899 HiddenTypesBuffer.insert(Ptr: ConvType);
1900
1901 // If this conversion is hidden and we're in a virtual base,
1902 // remember that it's hidden along some inheritance path.
1903 if (Hidden && InVirtual)
1904 HiddenVBaseCs.insert(Ptr: cast<NamedDecl>(Val: I.getDecl()->getCanonicalDecl()));
1905
1906 // If this conversion isn't hidden, add it to the appropriate output.
1907 else if (!Hidden) {
1908 AccessSpecifier IAccess
1909 = CXXRecordDecl::MergeAccess(PathAccess: Access, DeclAccess: I.getAccess());
1910
1911 if (InVirtual)
1912 VOutput.addDecl(D: I.getDecl(), AS: IAccess);
1913 else
1914 Output.addDecl(C&: Context, D: I.getDecl(), AS: IAccess);
1915 }
1916 }
1917 }
1918
1919 // Collect information recursively from any base classes.
1920 for (const auto &I : Record->bases()) {
1921 const auto *Base = I.getType()->getAsCXXRecordDecl();
1922 if (!Base)
1923 continue;
1924
1925 AccessSpecifier BaseAccess
1926 = CXXRecordDecl::MergeAccess(PathAccess: Access, DeclAccess: I.getAccessSpecifier());
1927 bool BaseInVirtual = InVirtual || I.isVirtual();
1928
1929 CollectVisibleConversions(Context, Record: Base, InVirtual: BaseInVirtual, Access: BaseAccess,
1930 ParentHiddenTypes: *HiddenTypes, Output, VOutput, HiddenVBaseCs);
1931 }
1932}
1933
1934/// Collect the visible conversions of a class.
1935///
1936/// This would be extremely straightforward if it weren't for virtual
1937/// bases. It might be worth special-casing that, really.
1938static void CollectVisibleConversions(ASTContext &Context,
1939 const CXXRecordDecl *Record,
1940 ASTUnresolvedSet &Output) {
1941 // The collection of all conversions in virtual bases that we've
1942 // found. These will be added to the output as long as they don't
1943 // appear in the hidden-conversions set.
1944 UnresolvedSet<8> VBaseCs;
1945
1946 // The set of conversions in virtual bases that we've determined to
1947 // be hidden.
1948 llvm::SmallPtrSet<NamedDecl*, 8> HiddenVBaseCs;
1949
1950 // The set of types hidden by classes derived from this one.
1951 llvm::SmallPtrSet<CanQualType, 8> HiddenTypes;
1952
1953 // Go ahead and collect the direct conversions and add them to the
1954 // hidden-types set.
1955 CXXRecordDecl::conversion_iterator ConvI = Record->conversion_begin();
1956 CXXRecordDecl::conversion_iterator ConvE = Record->conversion_end();
1957 Output.append(C&: Context, I: ConvI, E: ConvE);
1958 for (; ConvI != ConvE; ++ConvI)
1959 HiddenTypes.insert(Ptr: GetConversionType(Context, Conv: ConvI.getDecl()));
1960
1961 // Recursively collect conversions from base classes.
1962 for (const auto &I : Record->bases()) {
1963 const auto *Base = I.getType()->getAsCXXRecordDecl();
1964 if (!Base)
1965 continue;
1966
1967 CollectVisibleConversions(Context, Record: Base, InVirtual: I.isVirtual(),
1968 Access: I.getAccessSpecifier(), ParentHiddenTypes: HiddenTypes, Output,
1969 VOutput&: VBaseCs, HiddenVBaseCs);
1970 }
1971
1972 // Add any unhidden conversions provided by virtual bases.
1973 for (UnresolvedSetIterator I = VBaseCs.begin(), E = VBaseCs.end();
1974 I != E; ++I) {
1975 if (!HiddenVBaseCs.count(Ptr: cast<NamedDecl>(Val: I.getDecl()->getCanonicalDecl())))
1976 Output.addDecl(C&: Context, D: I.getDecl(), AS: I.getAccess());
1977 }
1978}
1979
1980/// getVisibleConversionFunctions - get all conversion functions visible
1981/// in current class; including conversion function templates.
1982llvm::iterator_range<CXXRecordDecl::conversion_iterator>
1983CXXRecordDecl::getVisibleConversionFunctions() const {
1984 ASTContext &Ctx = getASTContext();
1985
1986 ASTUnresolvedSet *Set;
1987 if (bases().empty()) {
1988 // If root class, all conversions are visible.
1989 Set = &data().Conversions.get(C&: Ctx);
1990 } else {
1991 Set = &data().VisibleConversions.get(C&: Ctx);
1992 // If visible conversion list is not evaluated, evaluate it.
1993 if (!data().ComputedVisibleConversions) {
1994 CollectVisibleConversions(Context&: Ctx, Record: this, Output&: *Set);
1995 data().ComputedVisibleConversions = true;
1996 }
1997 }
1998 return llvm::make_range(x: Set->begin(), y: Set->end());
1999}
2000
2001void CXXRecordDecl::removeConversion(const NamedDecl *ConvDecl) {
2002 // This operation is O(N) but extremely rare. Sema only uses it to
2003 // remove UsingShadowDecls in a class that were followed by a direct
2004 // declaration, e.g.:
2005 // class A : B {
2006 // using B::operator int;
2007 // operator int();
2008 // };
2009 // This is uncommon by itself and even more uncommon in conjunction
2010 // with sufficiently large numbers of directly-declared conversions
2011 // that asymptotic behavior matters.
2012
2013 ASTUnresolvedSet &Convs = data().Conversions.get(C&: getASTContext());
2014 for (unsigned I = 0, E = Convs.size(); I != E; ++I) {
2015 if (Convs[I].getDecl() == ConvDecl) {
2016 Convs.erase(I);
2017 assert(!llvm::is_contained(Convs, ConvDecl) &&
2018 "conversion was found multiple times in unresolved set");
2019 return;
2020 }
2021 }
2022
2023 llvm_unreachable("conversion not found in set!");
2024}
2025
2026CXXRecordDecl *CXXRecordDecl::getInstantiatedFromMemberClass() const {
2027 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo())
2028 return cast<CXXRecordDecl>(Val: MSInfo->getInstantiatedFrom());
2029
2030 return nullptr;
2031}
2032
2033MemberSpecializationInfo *CXXRecordDecl::getMemberSpecializationInfo() const {
2034 return dyn_cast_if_present<MemberSpecializationInfo *>(
2035 Val: TemplateOrInstantiation);
2036}
2037
2038void
2039CXXRecordDecl::setInstantiationOfMemberClass(CXXRecordDecl *RD,
2040 TemplateSpecializationKind TSK) {
2041 assert(TemplateOrInstantiation.isNull() &&
2042 "Previous template or instantiation?");
2043 assert(!isa<ClassTemplatePartialSpecializationDecl>(this));
2044 TemplateOrInstantiation
2045 = new (getASTContext()) MemberSpecializationInfo(RD, TSK);
2046}
2047
2048ClassTemplateDecl *CXXRecordDecl::getDescribedClassTemplate() const {
2049 return dyn_cast_if_present<ClassTemplateDecl *>(Val: TemplateOrInstantiation);
2050}
2051
2052void CXXRecordDecl::setDescribedClassTemplate(ClassTemplateDecl *Template) {
2053 TemplateOrInstantiation = Template;
2054}
2055
2056TemplateSpecializationKind CXXRecordDecl::getTemplateSpecializationKind() const{
2057 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(Val: this))
2058 return Spec->getSpecializationKind();
2059
2060 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo())
2061 return MSInfo->getTemplateSpecializationKind();
2062
2063 return TSK_Undeclared;
2064}
2065
2066void
2067CXXRecordDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK) {
2068 if (auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(Val: this)) {
2069 Spec->setSpecializationKind(TSK);
2070 return;
2071 }
2072
2073 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
2074 MSInfo->setTemplateSpecializationKind(TSK);
2075 return;
2076 }
2077
2078 llvm_unreachable("Not a class template or member class specialization");
2079}
2080
2081const CXXRecordDecl *CXXRecordDecl::getTemplateInstantiationPattern() const {
2082 auto GetDefinitionOrSelf =
2083 [](const CXXRecordDecl *D) -> const CXXRecordDecl * {
2084 if (auto *Def = D->getDefinition())
2085 return Def;
2086 return D;
2087 };
2088
2089 // If it's a class template specialization, find the template or partial
2090 // specialization from which it was instantiated.
2091 if (auto *TD = dyn_cast<ClassTemplateSpecializationDecl>(Val: this)) {
2092 auto From = TD->getInstantiatedFrom();
2093 if (auto *CTD = dyn_cast_if_present<ClassTemplateDecl *>(Val&: From)) {
2094 while (auto *NewCTD = CTD->getInstantiatedFromMemberTemplate()) {
2095 if (NewCTD->isMemberSpecialization())
2096 break;
2097 CTD = NewCTD;
2098 }
2099 return GetDefinitionOrSelf(CTD->getTemplatedDecl());
2100 }
2101 if (auto *CTPSD =
2102 dyn_cast_if_present<ClassTemplatePartialSpecializationDecl *>(
2103 Val&: From)) {
2104 while (auto *NewCTPSD = CTPSD->getInstantiatedFromMember()) {
2105 if (NewCTPSD->isMemberSpecialization())
2106 break;
2107 CTPSD = NewCTPSD;
2108 }
2109 return GetDefinitionOrSelf(CTPSD);
2110 }
2111 }
2112
2113 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
2114 if (isTemplateInstantiation(Kind: MSInfo->getTemplateSpecializationKind())) {
2115 const CXXRecordDecl *RD = this;
2116 while (auto *NewRD = RD->getInstantiatedFromMemberClass())
2117 RD = NewRD;
2118 return GetDefinitionOrSelf(RD);
2119 }
2120 }
2121
2122 assert(!isTemplateInstantiation(this->getTemplateSpecializationKind()) &&
2123 "couldn't find pattern for class template instantiation");
2124 return nullptr;
2125}
2126
2127CXXDestructorDecl *CXXRecordDecl::getDestructor() const {
2128 ASTContext &Context = getASTContext();
2129 CanQualType ClassType = Context.getCanonicalTagType(TD: this);
2130
2131 DeclarationName Name =
2132 Context.DeclarationNames.getCXXDestructorName(Ty: ClassType);
2133
2134 DeclContext::lookup_result R = lookup(Name);
2135
2136 // If a destructor was marked as not selected, we skip it. We don't always
2137 // have a selected destructor: dependent types, unnamed structs.
2138 for (auto *Decl : R) {
2139 auto* DD = dyn_cast<CXXDestructorDecl>(Val: Decl);
2140 if (DD && !DD->isIneligibleOrNotSelected())
2141 return DD;
2142 }
2143 return nullptr;
2144}
2145
2146bool CXXRecordDecl::hasDeletedDestructor() const {
2147 if (const CXXDestructorDecl *D = getDestructor())
2148 return D->isDeleted();
2149 return false;
2150}
2151
2152bool CXXRecordDecl::isInjectedClassName() const {
2153 if (!isImplicit() || !getDeclName())
2154 return false;
2155
2156 if (const auto *RD = dyn_cast<CXXRecordDecl>(Val: getDeclContext()))
2157 return RD->getDeclName() == getDeclName();
2158
2159 return false;
2160}
2161
2162bool CXXRecordDecl::hasInjectedClassType() const {
2163 switch (getDeclKind()) {
2164 case Decl::ClassTemplatePartialSpecialization:
2165 return true;
2166 case Decl::ClassTemplateSpecialization:
2167 return false;
2168 case Decl::CXXRecord:
2169 return getDescribedClassTemplate() != nullptr;
2170 default:
2171 llvm_unreachable("unexpected decl kind");
2172 }
2173}
2174
2175CanQualType CXXRecordDecl::getCanonicalTemplateSpecializationType(
2176 const ASTContext &Ctx) const {
2177 if (auto *RD = dyn_cast<ClassTemplatePartialSpecializationDecl>(Val: this))
2178 return RD->getCanonicalInjectedSpecializationType(Ctx);
2179 if (const ClassTemplateDecl *TD = getDescribedClassTemplate();
2180 TD && !isa<ClassTemplateSpecializationDecl>(Val: this))
2181 return TD->getCanonicalInjectedSpecializationType(Ctx);
2182 return CanQualType();
2183}
2184
2185static bool isDeclContextInNamespace(const DeclContext *DC) {
2186 while (!DC->isTranslationUnit()) {
2187 if (DC->isNamespace())
2188 return true;
2189 DC = DC->getParent();
2190 }
2191 return false;
2192}
2193
2194bool CXXRecordDecl::isInterfaceLike() const {
2195 assert(hasDefinition() && "checking for interface-like without a definition");
2196 // All __interfaces are inheritently interface-like.
2197 if (isInterface())
2198 return true;
2199
2200 // Interface-like types cannot have a user declared constructor, destructor,
2201 // friends, VBases, conversion functions, or fields. Additionally, lambdas
2202 // cannot be interface types.
2203 if (isLambda() || hasUserDeclaredConstructor() ||
2204 hasUserDeclaredDestructor() || !field_empty() || hasFriends() ||
2205 getNumVBases() > 0 || conversion_end() - conversion_begin() > 0)
2206 return false;
2207
2208 // No interface-like type can have a method with a definition.
2209 for (const auto *const Method : methods())
2210 if (Method->isDefined() && !Method->isImplicit())
2211 return false;
2212
2213 // Check "Special" types.
2214 const auto *Uuid = getAttr<UuidAttr>();
2215 // MS SDK declares IUnknown/IDispatch both in the root of a TU, or in an
2216 // extern C++ block directly in the TU. These are only valid if in one
2217 // of these two situations.
2218 if (Uuid && isStruct() && !getDeclContext()->isExternCContext() &&
2219 !isDeclContextInNamespace(DC: getDeclContext()) &&
2220 ((getName() == "IUnknown" &&
2221 Uuid->getGuid() == "00000000-0000-0000-C000-000000000046") ||
2222 (getName() == "IDispatch" &&
2223 Uuid->getGuid() == "00020400-0000-0000-C000-000000000046"))) {
2224 if (getNumBases() > 0)
2225 return false;
2226 return true;
2227 }
2228
2229 // FIXME: Any access specifiers is supposed to make this no longer interface
2230 // like.
2231
2232 // If this isn't a 'special' type, it must have a single interface-like base.
2233 if (getNumBases() != 1)
2234 return false;
2235
2236 const auto BaseSpec = *bases_begin();
2237 if (BaseSpec.isVirtual() || BaseSpec.getAccessSpecifier() != AS_public)
2238 return false;
2239 const auto *Base = BaseSpec.getType()->getAsCXXRecordDecl();
2240 if (Base->isInterface() || !Base->isInterfaceLike())
2241 return false;
2242 return true;
2243}
2244
2245void CXXRecordDecl::completeDefinition() {
2246 completeDefinition(FinalOverriders: nullptr);
2247}
2248
2249static bool hasPureVirtualFinalOverrider(
2250 const CXXRecordDecl &RD, const CXXFinalOverriderMap *FinalOverriders) {
2251 if (!FinalOverriders) {
2252 CXXFinalOverriderMap MyFinalOverriders;
2253 RD.getFinalOverriders(FinaOverriders&: MyFinalOverriders);
2254 return hasPureVirtualFinalOverrider(RD, FinalOverriders: &MyFinalOverriders);
2255 }
2256
2257 for (const CXXFinalOverriderMap::value_type &
2258 OverridingMethodsEntry : *FinalOverriders) {
2259 for (const auto &[_, SubobjOverrides] : OverridingMethodsEntry.second) {
2260 assert(SubobjOverrides.size() > 0 &&
2261 "All virtual functions have overriding virtual functions");
2262
2263 if (SubobjOverrides.front().Method->isPureVirtual())
2264 return true;
2265 }
2266 }
2267 return false;
2268}
2269
2270void CXXRecordDecl::completeDefinition(CXXFinalOverriderMap *FinalOverriders) {
2271 RecordDecl::completeDefinition();
2272
2273 // If the class may be abstract (but hasn't been marked as such), check for
2274 // any pure final overriders.
2275 //
2276 // C++ [class.abstract]p4:
2277 // A class is abstract if it contains or inherits at least one
2278 // pure virtual function for which the final overrider is pure
2279 // virtual.
2280 if (mayBeAbstract() && hasPureVirtualFinalOverrider(RD: *this, FinalOverriders))
2281 markAbstract();
2282
2283 // Set access bits correctly on the directly-declared conversions.
2284 for (conversion_iterator I = conversion_begin(), E = conversion_end();
2285 I != E; ++I)
2286 I.setAccess((*I)->getAccess());
2287
2288 ASTContext &Context = getASTContext();
2289
2290 if (isAggregate() && hasUserDeclaredConstructor() &&
2291 !Context.getLangOpts().CPlusPlus20) {
2292 // Diagnose any aggregate behavior changes in C++20
2293 for (const FieldDecl *FD : fields()) {
2294 if (const auto *AT = FD->getAttr<ExplicitInitAttr>())
2295 Context.getDiagnostics().Report(
2296 Loc: AT->getLocation(),
2297 DiagID: diag::warn_cxx20_compat_requires_explicit_init_non_aggregate)
2298 << AT << FD << Context.getCanonicalTagType(TD: this);
2299 }
2300 }
2301
2302 if (!isAggregate() && hasUninitializedExplicitInitFields()) {
2303 // Diagnose any fields that required explicit initialization in a
2304 // non-aggregate type. (Note that the fields may not be directly in this
2305 // type, but in a subobject. In such cases we don't emit diagnoses here.)
2306 for (const FieldDecl *FD : fields()) {
2307 if (const auto *AT = FD->getAttr<ExplicitInitAttr>())
2308 Context.getDiagnostics().Report(Loc: AT->getLocation(),
2309 DiagID: diag::warn_attribute_needs_aggregate)
2310 << AT << Context.getCanonicalTagType(TD: this);
2311 }
2312 setHasUninitializedExplicitInitFields(false);
2313 }
2314
2315 if (getLangOpts().PointerFieldProtectionABI && !isStandardLayout()) {
2316 data().IsPFPType = true;
2317 } else if (hasAttr<PointerFieldProtectionAttr>()) {
2318 data().IsPFPType = true;
2319 data().IsStandardLayout = false;
2320 data().IsCXX11StandardLayout = false;
2321 }
2322}
2323
2324bool CXXRecordDecl::mayBeAbstract() const {
2325 if (data().Abstract || isInvalidDecl() || !data().Polymorphic ||
2326 isDependentContext())
2327 return false;
2328
2329 for (const auto &B : bases()) {
2330 const auto *BaseDecl = cast<CXXRecordDecl>(
2331 Val: B.getType()->castAsCanonical<RecordType>()->getDecl());
2332 if (BaseDecl->isAbstract())
2333 return true;
2334 }
2335
2336 return false;
2337}
2338
2339bool CXXRecordDecl::isEffectivelyFinal() const {
2340 auto *Def = getDefinition();
2341 if (!Def)
2342 return false;
2343 if (Def->hasAttr<FinalAttr>())
2344 return true;
2345 if (const auto *Dtor = Def->getDestructor())
2346 if (Dtor->hasAttr<FinalAttr>())
2347 return true;
2348 return false;
2349}
2350
2351void CXXDeductionGuideDecl::anchor() {}
2352
2353bool ExplicitSpecifier::isEquivalent(const ExplicitSpecifier Other) const {
2354 if ((getKind() != Other.getKind() ||
2355 getKind() == ExplicitSpecKind::Unresolved)) {
2356 if (getKind() == ExplicitSpecKind::Unresolved &&
2357 Other.getKind() == ExplicitSpecKind::Unresolved) {
2358 ODRHash SelfHash, OtherHash;
2359 SelfHash.AddStmt(S: getExpr());
2360 OtherHash.AddStmt(S: Other.getExpr());
2361 return SelfHash.CalculateHash() == OtherHash.CalculateHash();
2362 } else
2363 return false;
2364 }
2365 return true;
2366}
2367
2368ExplicitSpecifier ExplicitSpecifier::getFromDecl(FunctionDecl *Function) {
2369 switch (Function->getDeclKind()) {
2370 case Decl::Kind::CXXConstructor:
2371 return cast<CXXConstructorDecl>(Val: Function)->getExplicitSpecifier();
2372 case Decl::Kind::CXXConversion:
2373 return cast<CXXConversionDecl>(Val: Function)->getExplicitSpecifier();
2374 case Decl::Kind::CXXDeductionGuide:
2375 return cast<CXXDeductionGuideDecl>(Val: Function)->getExplicitSpecifier();
2376 default:
2377 return {};
2378 }
2379}
2380
2381CXXDeductionGuideDecl *CXXDeductionGuideDecl::Create(
2382 ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
2383 ExplicitSpecifier ES, const DeclarationNameInfo &NameInfo, QualType T,
2384 TypeSourceInfo *TInfo, SourceLocation EndLocation, CXXConstructorDecl *Ctor,
2385 DeductionCandidate Kind, const AssociatedConstraint &TrailingRequiresClause,
2386 const CXXDeductionGuideDecl *GeneratedFrom,
2387 SourceDeductionGuideKind SourceKind) {
2388 return new (C, DC) CXXDeductionGuideDecl(
2389 C, DC, StartLoc, ES, NameInfo, T, TInfo, EndLocation, Ctor, Kind,
2390 TrailingRequiresClause, GeneratedFrom, SourceKind);
2391}
2392
2393CXXDeductionGuideDecl *
2394CXXDeductionGuideDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
2395 return new (C, ID) CXXDeductionGuideDecl(
2396 C, /*DC=*/nullptr, SourceLocation(), ExplicitSpecifier(),
2397 DeclarationNameInfo(), QualType(), /*TInfo=*/nullptr, SourceLocation(),
2398 /*Ctor=*/nullptr, DeductionCandidate::Normal,
2399 /*TrailingRequiresClause=*/{},
2400 /*GeneratedFrom=*/nullptr, SourceDeductionGuideKind::None);
2401}
2402
2403RequiresExprBodyDecl *RequiresExprBodyDecl::Create(
2404 ASTContext &C, DeclContext *DC, SourceLocation StartLoc) {
2405 return new (C, DC) RequiresExprBodyDecl(C, DC, StartLoc);
2406}
2407
2408RequiresExprBodyDecl *
2409RequiresExprBodyDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
2410 return new (C, ID) RequiresExprBodyDecl(C, nullptr, SourceLocation());
2411}
2412
2413void CXXMethodDecl::anchor() {}
2414
2415bool CXXMethodDecl::isStatic() const {
2416 const CXXMethodDecl *MD = getCanonicalDecl();
2417
2418 if (MD->getStorageClass() == SC_Static)
2419 return true;
2420
2421 OverloadedOperatorKind OOK = getDeclName().getCXXOverloadedOperator();
2422 return isStaticOverloadedOperator(OOK);
2423}
2424
2425static bool recursivelyOverrides(const CXXMethodDecl *DerivedMD,
2426 const CXXMethodDecl *BaseMD) {
2427 for (const CXXMethodDecl *MD : DerivedMD->overridden_methods()) {
2428 if (MD->getCanonicalDecl() == BaseMD->getCanonicalDecl())
2429 return true;
2430 if (recursivelyOverrides(DerivedMD: MD, BaseMD))
2431 return true;
2432 }
2433 return false;
2434}
2435
2436CXXMethodDecl *
2437CXXMethodDecl::getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD,
2438 bool MayBeBase) {
2439 if (this->getParent()->getCanonicalDecl() == RD->getCanonicalDecl())
2440 return this;
2441
2442 // Lookup doesn't work for destructors, so handle them separately.
2443 if (isa<CXXDestructorDecl>(Val: this)) {
2444 CXXMethodDecl *MD = RD->getDestructor();
2445 if (MD) {
2446 if (recursivelyOverrides(DerivedMD: MD, BaseMD: this))
2447 return MD;
2448 if (MayBeBase && recursivelyOverrides(DerivedMD: this, BaseMD: MD))
2449 return MD;
2450 }
2451 return nullptr;
2452 }
2453
2454 for (auto *ND : RD->lookup(Name: getDeclName())) {
2455 auto *MD = dyn_cast<CXXMethodDecl>(Val: ND);
2456 if (!MD)
2457 continue;
2458 if (recursivelyOverrides(DerivedMD: MD, BaseMD: this))
2459 return MD;
2460 if (MayBeBase && recursivelyOverrides(DerivedMD: this, BaseMD: MD))
2461 return MD;
2462 }
2463
2464 return nullptr;
2465}
2466
2467CXXMethodDecl *
2468CXXMethodDecl::getCorrespondingMethodInClass(const CXXRecordDecl *RD,
2469 bool MayBeBase) {
2470 if (auto *MD = getCorrespondingMethodDeclaredInClass(RD, MayBeBase))
2471 return MD;
2472
2473 llvm::SmallVector<CXXMethodDecl*, 4> FinalOverriders;
2474 auto AddFinalOverrider = [&](CXXMethodDecl *D) {
2475 // If this function is overridden by a candidate final overrider, it is not
2476 // a final overrider.
2477 for (CXXMethodDecl *OtherD : FinalOverriders) {
2478 if (declaresSameEntity(D1: D, D2: OtherD) || recursivelyOverrides(DerivedMD: OtherD, BaseMD: D))
2479 return;
2480 }
2481
2482 // Other candidate final overriders might be overridden by this function.
2483 llvm::erase_if(C&: FinalOverriders, P: [&](CXXMethodDecl *OtherD) {
2484 return recursivelyOverrides(DerivedMD: D, BaseMD: OtherD);
2485 });
2486
2487 FinalOverriders.push_back(Elt: D);
2488 };
2489
2490 for (const auto &I : RD->bases()) {
2491 const auto *Base = I.getType()->getAsCXXRecordDecl();
2492 if (!Base)
2493 continue;
2494 if (CXXMethodDecl *D = this->getCorrespondingMethodInClass(RD: Base))
2495 AddFinalOverrider(D);
2496 }
2497
2498 return FinalOverriders.size() == 1 ? FinalOverriders.front() : nullptr;
2499}
2500
2501CXXMethodDecl *
2502CXXMethodDecl::Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
2503 const DeclarationNameInfo &NameInfo, QualType T,
2504 TypeSourceInfo *TInfo, StorageClass SC, bool UsesFPIntrin,
2505 bool isInline, ConstexprSpecKind ConstexprKind,
2506 SourceLocation EndLocation,
2507 const AssociatedConstraint &TrailingRequiresClause) {
2508 return new (C, RD) CXXMethodDecl(
2509 CXXMethod, C, RD, StartLoc, NameInfo, T, TInfo, SC, UsesFPIntrin,
2510 isInline, ConstexprKind, EndLocation, TrailingRequiresClause);
2511}
2512
2513CXXMethodDecl *CXXMethodDecl::CreateDeserialized(ASTContext &C,
2514 GlobalDeclID ID) {
2515 return new (C, ID)
2516 CXXMethodDecl(CXXMethod, C, nullptr, SourceLocation(),
2517 DeclarationNameInfo(), QualType(), nullptr, SC_None, false,
2518 false, ConstexprSpecKind::Unspecified, SourceLocation(),
2519 /*TrailingRequiresClause=*/{});
2520}
2521
2522CXXMethodDecl *CXXMethodDecl::getDevirtualizedMethod(const Expr *Base,
2523 bool IsAppleKext) {
2524 assert(isVirtual() && "this method is expected to be virtual");
2525
2526 // When building with -fapple-kext, all calls must go through the vtable since
2527 // the kernel linker can do runtime patching of vtables.
2528 if (IsAppleKext)
2529 return nullptr;
2530
2531 // If the member function is marked 'final', we know that it can't be
2532 // overridden and can therefore devirtualize it unless it's pure virtual.
2533 if (hasAttr<FinalAttr>())
2534 return isPureVirtual() ? nullptr : this;
2535
2536 // If Base is unknown, we cannot devirtualize.
2537 if (!Base)
2538 return nullptr;
2539
2540 // If the base expression (after skipping derived-to-base conversions) is a
2541 // class prvalue, then we can devirtualize.
2542 Base = Base->getBestDynamicClassTypeExpr();
2543 if (Base->isPRValue() && Base->getType()->isRecordType())
2544 return this;
2545
2546 // If we don't even know what we would call, we can't devirtualize.
2547 const CXXRecordDecl *BestDynamicDecl = Base->getBestDynamicClassType();
2548 if (!BestDynamicDecl)
2549 return nullptr;
2550
2551 // There may be a method corresponding to MD in a derived class.
2552 CXXMethodDecl *DevirtualizedMethod =
2553 getCorrespondingMethodInClass(RD: BestDynamicDecl);
2554
2555 // If there final overrider in the dynamic type is ambiguous, we can't
2556 // devirtualize this call.
2557 if (!DevirtualizedMethod)
2558 return nullptr;
2559
2560 // If that method is pure virtual, we can't devirtualize. If this code is
2561 // reached, the result would be UB, not a direct call to the derived class
2562 // function, and we can't assume the derived class function is defined.
2563 if (DevirtualizedMethod->isPureVirtual())
2564 return nullptr;
2565
2566 // If that method is marked final, we can devirtualize it.
2567 if (DevirtualizedMethod->hasAttr<FinalAttr>())
2568 return DevirtualizedMethod;
2569
2570 // Similarly, if the class itself or its destructor is marked 'final',
2571 // the class can't be derived from and we can therefore devirtualize the
2572 // member function call.
2573 if (BestDynamicDecl->isEffectivelyFinal())
2574 return DevirtualizedMethod;
2575
2576 if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: Base)) {
2577 if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
2578 if (VD->getType()->isRecordType())
2579 // This is a record decl. We know the type and can devirtualize it.
2580 return DevirtualizedMethod;
2581
2582 return nullptr;
2583 }
2584
2585 // We can devirtualize calls on an object accessed by a class member access
2586 // expression, since by C++11 [basic.life]p6 we know that it can't refer to
2587 // a derived class object constructed in the same location.
2588 if (const auto *ME = dyn_cast<MemberExpr>(Val: Base)) {
2589 const ValueDecl *VD = ME->getMemberDecl();
2590 return VD->getType()->isRecordType() ? DevirtualizedMethod : nullptr;
2591 }
2592
2593 // Likewise for calls on an object accessed by a (non-reference) pointer to
2594 // member access.
2595 if (auto *BO = dyn_cast<BinaryOperator>(Val: Base)) {
2596 if (BO->isPtrMemOp()) {
2597 auto *MPT = BO->getRHS()->getType()->castAs<MemberPointerType>();
2598 if (MPT->getPointeeType()->isRecordType())
2599 return DevirtualizedMethod;
2600 }
2601 }
2602
2603 // We can't devirtualize the call.
2604 return nullptr;
2605}
2606
2607bool CXXMethodDecl::isUsualDeallocationFunction(
2608 SmallVectorImpl<const FunctionDecl *> &PreventedBy) const {
2609 assert(PreventedBy.empty() && "PreventedBy is expected to be empty");
2610 if (!getDeclName().isAnyOperatorDelete())
2611 return false;
2612
2613 if (isTypeAwareOperatorNewOrDelete()) {
2614 // A variadic type aware allocation function is not a usual deallocation
2615 // function
2616 if (isVariadic())
2617 return false;
2618
2619 // Type aware deallocation functions are only usual if they only accept the
2620 // mandatory arguments
2621 if (getNumParams() != FunctionDecl::RequiredTypeAwareDeleteParameterCount)
2622 return false;
2623
2624 FunctionTemplateDecl *PrimaryTemplate = getPrimaryTemplate();
2625 if (!PrimaryTemplate)
2626 return true;
2627
2628 // A template instance is is only a usual deallocation function if it has a
2629 // type-identity parameter, the type-identity parameter is a dependent type
2630 // (i.e. the type-identity parameter is of type std::type_identity<U> where
2631 // U shall be a dependent type), and the type-identity parameter is the only
2632 // dependent parameter, and there are no template packs in the parameter
2633 // list.
2634 FunctionDecl *SpecializedDecl = PrimaryTemplate->getTemplatedDecl();
2635 if (!SpecializedDecl->getParamDecl(i: 0)->getType()->isDependentType())
2636 return false;
2637 for (unsigned Idx = 1; Idx < getNumParams(); ++Idx) {
2638 if (SpecializedDecl->getParamDecl(i: Idx)->getType()->isDependentType())
2639 return false;
2640 }
2641 return true;
2642 }
2643
2644 // C++ [basic.stc.dynamic.deallocation]p2:
2645 // A template instance is never a usual deallocation function,
2646 // regardless of its signature.
2647 // Post-P2719 adoption:
2648 // A template instance is is only a usual deallocation function if it has a
2649 // type-identity parameter
2650 if (getPrimaryTemplate())
2651 return false;
2652
2653 // C++ [basic.stc.dynamic.deallocation]p2:
2654 // If a class T has a member deallocation function named operator delete
2655 // with exactly one parameter, then that function is a usual (non-placement)
2656 // deallocation function. [...]
2657 if (getNumParams() == 1)
2658 return true;
2659 unsigned UsualParams = 1;
2660
2661 // C++ P0722:
2662 // A destroying operator delete is a usual deallocation function if
2663 // removing the std::destroying_delete_t parameter and changing the
2664 // first parameter type from T* to void* results in the signature of
2665 // a usual deallocation function.
2666 if (isDestroyingOperatorDelete())
2667 ++UsualParams;
2668
2669 // C++ <=14 [basic.stc.dynamic.deallocation]p2:
2670 // [...] If class T does not declare such an operator delete but does
2671 // declare a member deallocation function named operator delete with
2672 // exactly two parameters, the second of which has type std::size_t (18.1),
2673 // then this function is a usual deallocation function.
2674 //
2675 // C++17 says a usual deallocation function is one with the signature
2676 // (void* [, size_t] [, std::align_val_t] [, ...])
2677 // and all such functions are usual deallocation functions. It's not clear
2678 // that allowing varargs functions was intentional.
2679 ASTContext &Context = getASTContext();
2680 if (UsualParams < getNumParams() &&
2681 Context.hasSameUnqualifiedType(T1: getParamDecl(i: UsualParams)->getType(),
2682 T2: Context.getSizeType()))
2683 ++UsualParams;
2684
2685 if (UsualParams < getNumParams() &&
2686 getParamDecl(i: UsualParams)->getType()->isAlignValT())
2687 ++UsualParams;
2688
2689 if (UsualParams != getNumParams())
2690 return false;
2691
2692 // In C++17 onwards, all potential usual deallocation functions are actual
2693 // usual deallocation functions. Honor this behavior when post-C++14
2694 // deallocation functions are offered as extensions too.
2695 // FIXME(EricWF): Destroying Delete should be a language option. How do we
2696 // handle when destroying delete is used prior to C++17?
2697 if (Context.getLangOpts().CPlusPlus17 ||
2698 Context.getLangOpts().AlignedAllocation ||
2699 isDestroyingOperatorDelete())
2700 return true;
2701
2702 // This function is a usual deallocation function if there are no
2703 // single-parameter deallocation functions of the same kind.
2704 DeclContext::lookup_result R = getDeclContext()->lookup(Name: getDeclName());
2705 bool Result = true;
2706 for (const auto *D : R) {
2707 if (const auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
2708 if (FD->getNumParams() == 1) {
2709 PreventedBy.push_back(Elt: FD);
2710 Result = false;
2711 }
2712 }
2713 }
2714 return Result;
2715}
2716
2717bool CXXMethodDecl::isExplicitObjectMemberFunction() const {
2718 // C++2b [dcl.fct]p6:
2719 // An explicit object member function is a non-static member
2720 // function with an explicit object parameter
2721 return !isStatic() && hasCXXExplicitFunctionObjectParameter();
2722}
2723
2724bool CXXMethodDecl::isImplicitObjectMemberFunction() const {
2725 return !isStatic() && !hasCXXExplicitFunctionObjectParameter();
2726}
2727
2728bool CXXMethodDecl::isCopyAssignmentOperator() const {
2729 // C++0x [class.copy]p17:
2730 // A user-declared copy assignment operator X::operator= is a non-static
2731 // non-template member function of class X with exactly one parameter of
2732 // type X, X&, const X&, volatile X& or const volatile X&.
2733 if (/*operator=*/getOverloadedOperator() != OO_Equal ||
2734 /*non-static*/ isStatic() ||
2735
2736 /*non-template*/ getPrimaryTemplate() || getDescribedFunctionTemplate() ||
2737 getNumExplicitParams() != 1)
2738 return false;
2739
2740 QualType ParamType = getNonObjectParameter(I: 0)->getType();
2741 if (const auto *Ref = ParamType->getAs<LValueReferenceType>())
2742 ParamType = Ref->getPointeeType();
2743
2744 ASTContext &Context = getASTContext();
2745 CanQualType ClassType = Context.getCanonicalTagType(TD: getParent());
2746 return Context.hasSameUnqualifiedType(T1: ClassType, T2: ParamType);
2747}
2748
2749bool CXXMethodDecl::isMoveAssignmentOperator() const {
2750 // C++0x [class.copy]p19:
2751 // A user-declared move assignment operator X::operator= is a non-static
2752 // non-template member function of class X with exactly one parameter of type
2753 // X&&, const X&&, volatile X&&, or const volatile X&&.
2754 if (getOverloadedOperator() != OO_Equal || isStatic() ||
2755 getPrimaryTemplate() || getDescribedFunctionTemplate() ||
2756 getNumExplicitParams() != 1)
2757 return false;
2758
2759 QualType ParamType = getNonObjectParameter(I: 0)->getType();
2760 if (!ParamType->isRValueReferenceType())
2761 return false;
2762 ParamType = ParamType->getPointeeType();
2763
2764 ASTContext &Context = getASTContext();
2765 CanQualType ClassType = Context.getCanonicalTagType(TD: getParent());
2766 return Context.hasSameUnqualifiedType(T1: ClassType, T2: ParamType);
2767}
2768
2769void CXXMethodDecl::addOverriddenMethod(const CXXMethodDecl *MD) {
2770 assert(MD->isCanonicalDecl() && "Method is not canonical!");
2771 assert(MD->isVirtual() && "Method is not virtual!");
2772
2773 getASTContext().addOverriddenMethod(Method: this, Overridden: MD);
2774}
2775
2776CXXMethodDecl::method_iterator CXXMethodDecl::begin_overridden_methods() const {
2777 if (isa<CXXConstructorDecl>(Val: this)) return nullptr;
2778 return getASTContext().overridden_methods_begin(Method: this);
2779}
2780
2781CXXMethodDecl::method_iterator CXXMethodDecl::end_overridden_methods() const {
2782 if (isa<CXXConstructorDecl>(Val: this)) return nullptr;
2783 return getASTContext().overridden_methods_end(Method: this);
2784}
2785
2786unsigned CXXMethodDecl::size_overridden_methods() const {
2787 if (isa<CXXConstructorDecl>(Val: this)) return 0;
2788 return getASTContext().overridden_methods_size(Method: this);
2789}
2790
2791CXXMethodDecl::overridden_method_range
2792CXXMethodDecl::overridden_methods() const {
2793 if (isa<CXXConstructorDecl>(Val: this))
2794 return overridden_method_range(nullptr, nullptr);
2795 return getASTContext().overridden_methods(Method: this);
2796}
2797
2798static QualType getThisObjectType(ASTContext &C, const FunctionProtoType *FPT,
2799 const CXXRecordDecl *Decl) {
2800 CanQualType ClassTy = C.getCanonicalTagType(TD: Decl);
2801 return C.getQualifiedType(T: ClassTy, Qs: FPT->getMethodQuals());
2802}
2803
2804QualType CXXMethodDecl::getThisType(const FunctionProtoType *FPT,
2805 const CXXRecordDecl *Decl) {
2806 ASTContext &C = Decl->getASTContext();
2807 QualType ObjectTy = ::getThisObjectType(C, FPT, Decl);
2808
2809 // Unlike 'const' and 'volatile', a '__restrict' qualifier must be
2810 // attached to the pointer type, not the pointee.
2811 bool Restrict = FPT->getMethodQuals().hasRestrict();
2812 if (Restrict)
2813 ObjectTy.removeLocalRestrict();
2814
2815 ObjectTy = C.getLangOpts().HLSL ? C.getLValueReferenceType(T: ObjectTy)
2816 : C.getPointerType(T: ObjectTy);
2817
2818 if (Restrict)
2819 ObjectTy.addRestrict();
2820 return ObjectTy;
2821}
2822
2823QualType CXXMethodDecl::getThisType() const {
2824 // C++ 9.3.2p1: The type of this in a member function of a class X is X*.
2825 // If the member function is declared const, the type of this is const X*,
2826 // if the member function is declared volatile, the type of this is
2827 // volatile X*, and if the member function is declared const volatile,
2828 // the type of this is const volatile X*.
2829 assert(isInstance() && "No 'this' for static methods!");
2830 return CXXMethodDecl::getThisType(FPT: getType()->castAs<FunctionProtoType>(),
2831 Decl: getParent());
2832}
2833
2834QualType CXXMethodDecl::getFunctionObjectParameterReferenceType() const {
2835 if (isExplicitObjectMemberFunction())
2836 return parameters()[0]->getType();
2837
2838 ASTContext &C = getParentASTContext();
2839 const FunctionProtoType *FPT = getType()->castAs<FunctionProtoType>();
2840 QualType Type = ::getThisObjectType(C, FPT, Decl: getParent());
2841 RefQualifierKind RK = FPT->getRefQualifier();
2842 if (RK == RefQualifierKind::RQ_RValue)
2843 return C.getRValueReferenceType(T: Type);
2844 return C.getLValueReferenceType(T: Type);
2845}
2846
2847bool CXXMethodDecl::hasInlineBody() const {
2848 // If this function is a template instantiation, look at the template from
2849 // which it was instantiated.
2850 const FunctionDecl *CheckFn = getTemplateInstantiationPattern();
2851 if (!CheckFn)
2852 CheckFn = this;
2853
2854 const FunctionDecl *fn;
2855 return CheckFn->isDefined(Definition&: fn) && !fn->isOutOfLine() &&
2856 (fn->doesThisDeclarationHaveABody() || fn->willHaveBody());
2857}
2858
2859bool CXXMethodDecl::isLambdaStaticInvoker() const {
2860 const CXXRecordDecl *P = getParent();
2861 return P->isLambda() && getDeclName().isIdentifier() &&
2862 getName() == getLambdaStaticInvokerName();
2863}
2864
2865CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context,
2866 TypeSourceInfo *TInfo, bool IsVirtual,
2867 SourceLocation L, Expr *Init,
2868 SourceLocation R,
2869 SourceLocation EllipsisLoc)
2870 : Initializee(TInfo), Init(Init), MemberOrEllipsisLocation(EllipsisLoc),
2871 LParenLoc(L), RParenLoc(R), IsDelegating(false), IsVirtual(IsVirtual),
2872 IsWritten(false), SourceOrder(0) {}
2873
2874CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context, FieldDecl *Member,
2875 SourceLocation MemberLoc,
2876 SourceLocation L, Expr *Init,
2877 SourceLocation R)
2878 : Initializee(Member), Init(Init), MemberOrEllipsisLocation(MemberLoc),
2879 LParenLoc(L), RParenLoc(R), IsDelegating(false), IsVirtual(false),
2880 IsWritten(false), SourceOrder(0) {}
2881
2882CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context,
2883 IndirectFieldDecl *Member,
2884 SourceLocation MemberLoc,
2885 SourceLocation L, Expr *Init,
2886 SourceLocation R)
2887 : Initializee(Member), Init(Init), MemberOrEllipsisLocation(MemberLoc),
2888 LParenLoc(L), RParenLoc(R), IsDelegating(false), IsVirtual(false),
2889 IsWritten(false), SourceOrder(0) {}
2890
2891CXXCtorInitializer::CXXCtorInitializer(ASTContext &Context,
2892 TypeSourceInfo *TInfo,
2893 SourceLocation L, Expr *Init,
2894 SourceLocation R)
2895 : Initializee(TInfo), Init(Init), LParenLoc(L), RParenLoc(R),
2896 IsDelegating(true), IsVirtual(false), IsWritten(false), SourceOrder(0) {}
2897
2898int64_t CXXCtorInitializer::getID(const ASTContext &Context) const {
2899 return Context.getAllocator()
2900 .identifyKnownAlignedObject<CXXCtorInitializer>(Ptr: this);
2901}
2902
2903TypeLoc CXXCtorInitializer::getBaseClassLoc() const {
2904 if (isBaseInitializer())
2905 return cast<TypeSourceInfo *>(Val: Initializee)->getTypeLoc();
2906 else
2907 return {};
2908}
2909
2910const Type *CXXCtorInitializer::getBaseClass() const {
2911 if (isBaseInitializer())
2912 return cast<TypeSourceInfo *>(Val: Initializee)->getType().getTypePtr();
2913 else
2914 return nullptr;
2915}
2916
2917SourceLocation CXXCtorInitializer::getSourceLocation() const {
2918 if (isInClassMemberInitializer())
2919 return getAnyMember()->getLocation();
2920
2921 if (isAnyMemberInitializer())
2922 return getMemberLocation();
2923
2924 if (const auto *TSInfo = cast<TypeSourceInfo *>(Val: Initializee))
2925 return TSInfo->getTypeLoc().getBeginLoc();
2926
2927 return {};
2928}
2929
2930SourceRange CXXCtorInitializer::getSourceRange() const {
2931 if (isInClassMemberInitializer()) {
2932 FieldDecl *D = getAnyMember();
2933 if (Expr *I = D->getInClassInitializer())
2934 return I->getSourceRange();
2935 return {};
2936 }
2937
2938 return SourceRange(getSourceLocation(), getRParenLoc());
2939}
2940
2941CXXConstructorDecl::CXXConstructorDecl(
2942 ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
2943 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
2944 ExplicitSpecifier ES, bool UsesFPIntrin, bool isInline,
2945 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind,
2946 InheritedConstructor Inherited,
2947 const AssociatedConstraint &TrailingRequiresClause)
2948 : CXXMethodDecl(CXXConstructor, C, RD, StartLoc, NameInfo, T, TInfo,
2949 SC_None, UsesFPIntrin, isInline, ConstexprKind,
2950 SourceLocation(), TrailingRequiresClause) {
2951 setNumCtorInitializers(0);
2952 setInheritingConstructor(static_cast<bool>(Inherited));
2953 setImplicit(isImplicitlyDeclared);
2954 CXXConstructorDeclBits.HasTrailingExplicitSpecifier = ES.getExpr() ? 1 : 0;
2955 if (Inherited)
2956 *getTrailingObjects<InheritedConstructor>() = Inherited;
2957 setExplicitSpecifier(ES);
2958}
2959
2960void CXXConstructorDecl::anchor() {}
2961
2962CXXConstructorDecl *CXXConstructorDecl::CreateDeserialized(ASTContext &C,
2963 GlobalDeclID ID,
2964 uint64_t AllocKind) {
2965 bool hasTrailingExplicit = static_cast<bool>(AllocKind & TAKHasTailExplicit);
2966 bool isInheritingConstructor =
2967 static_cast<bool>(AllocKind & TAKInheritsConstructor);
2968 unsigned Extra =
2969 additionalSizeToAlloc<InheritedConstructor, ExplicitSpecifier>(
2970 Counts: isInheritingConstructor, Counts: hasTrailingExplicit);
2971 auto *Result = new (C, ID, Extra) CXXConstructorDecl(
2972 C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
2973 ExplicitSpecifier(), false, false, false, ConstexprSpecKind::Unspecified,
2974 InheritedConstructor(), /*TrailingRequiresClause=*/{});
2975 Result->setInheritingConstructor(isInheritingConstructor);
2976 Result->CXXConstructorDeclBits.HasTrailingExplicitSpecifier =
2977 hasTrailingExplicit;
2978 Result->setExplicitSpecifier(ExplicitSpecifier());
2979 return Result;
2980}
2981
2982CXXConstructorDecl *CXXConstructorDecl::Create(
2983 ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
2984 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
2985 ExplicitSpecifier ES, bool UsesFPIntrin, bool isInline,
2986 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind,
2987 InheritedConstructor Inherited,
2988 const AssociatedConstraint &TrailingRequiresClause) {
2989 assert(NameInfo.getName().getNameKind()
2990 == DeclarationName::CXXConstructorName &&
2991 "Name must refer to a constructor");
2992 unsigned Extra =
2993 additionalSizeToAlloc<InheritedConstructor, ExplicitSpecifier>(
2994 Counts: Inherited ? 1 : 0, Counts: ES.getExpr() ? 1 : 0);
2995 return new (C, RD, Extra) CXXConstructorDecl(
2996 C, RD, StartLoc, NameInfo, T, TInfo, ES, UsesFPIntrin, isInline,
2997 isImplicitlyDeclared, ConstexprKind, Inherited, TrailingRequiresClause);
2998}
2999
3000CXXConstructorDecl::init_const_iterator CXXConstructorDecl::init_begin() const {
3001 return CtorInitializers.get(Source: getASTContext().getExternalSource());
3002}
3003
3004CXXConstructorDecl *CXXConstructorDecl::getTargetConstructor() const {
3005 assert(isDelegatingConstructor() && "Not a delegating constructor!");
3006 Expr *E = (*init_begin())->getInit()->IgnoreImplicit();
3007 if (const auto *Construct = dyn_cast<CXXConstructExpr>(Val: E))
3008 return Construct->getConstructor();
3009
3010 return nullptr;
3011}
3012
3013bool CXXConstructorDecl::isDefaultConstructor() const {
3014 // C++ [class.default.ctor]p1:
3015 // A default constructor for a class X is a constructor of class X for
3016 // which each parameter that is not a function parameter pack has a default
3017 // argument (including the case of a constructor with no parameters)
3018 return getMinRequiredArguments() == 0;
3019}
3020
3021bool
3022CXXConstructorDecl::isCopyConstructor(unsigned &TypeQuals) const {
3023 return isCopyOrMoveConstructor(TypeQuals) &&
3024 getParamDecl(i: 0)->getType()->isLValueReferenceType();
3025}
3026
3027bool CXXConstructorDecl::isMoveConstructor(unsigned &TypeQuals) const {
3028 return isCopyOrMoveConstructor(TypeQuals) &&
3029 getParamDecl(i: 0)->getType()->isRValueReferenceType();
3030}
3031
3032/// Determine whether this is a copy or move constructor.
3033bool CXXConstructorDecl::isCopyOrMoveConstructor(unsigned &TypeQuals) const {
3034 // C++ [class.copy]p2:
3035 // A non-template constructor for class X is a copy constructor
3036 // if its first parameter is of type X&, const X&, volatile X& or
3037 // const volatile X&, and either there are no other parameters
3038 // or else all other parameters have default arguments (8.3.6).
3039 // C++0x [class.copy]p3:
3040 // A non-template constructor for class X is a move constructor if its
3041 // first parameter is of type X&&, const X&&, volatile X&&, or
3042 // const volatile X&&, and either there are no other parameters or else
3043 // all other parameters have default arguments.
3044 if (!hasOneParamOrDefaultArgs() || getPrimaryTemplate() != nullptr ||
3045 getDescribedFunctionTemplate() != nullptr)
3046 return false;
3047
3048 const ParmVarDecl *Param = getParamDecl(i: 0);
3049
3050 // Do we have a reference type?
3051 const auto *ParamRefType = Param->getType()->getAs<ReferenceType>();
3052 if (!ParamRefType)
3053 return false;
3054
3055 // Is it a reference to our class type?
3056 ASTContext &Context = getASTContext();
3057
3058 QualType PointeeType = ParamRefType->getPointeeType();
3059 CanQualType ClassTy = Context.getCanonicalTagType(TD: getParent());
3060 if (!Context.hasSameUnqualifiedType(T1: PointeeType, T2: ClassTy))
3061 return false;
3062
3063 // FIXME: other qualifiers?
3064
3065 // We have a copy or move constructor.
3066 TypeQuals = PointeeType.getCVRQualifiers();
3067 return true;
3068}
3069
3070bool CXXConstructorDecl::isConvertingConstructor(bool AllowExplicit) const {
3071 // C++ [class.conv.ctor]p1:
3072 // A constructor declared without the function-specifier explicit
3073 // that can be called with a single parameter specifies a
3074 // conversion from the type of its first parameter to the type of
3075 // its class. Such a constructor is called a converting
3076 // constructor.
3077 if (isExplicit() && !AllowExplicit)
3078 return false;
3079
3080 // FIXME: This has nothing to do with the definition of converting
3081 // constructor, but is convenient for how we use this function in overload
3082 // resolution.
3083 return getNumParams() == 0
3084 ? getType()->castAs<FunctionProtoType>()->isVariadic()
3085 : getMinRequiredArguments() <= 1;
3086}
3087
3088bool CXXConstructorDecl::isSpecializationCopyingObject() const {
3089 if (!hasOneParamOrDefaultArgs() || getDescribedFunctionTemplate() != nullptr)
3090 return false;
3091
3092 const ParmVarDecl *Param = getParamDecl(i: 0);
3093
3094 ASTContext &Context = getASTContext();
3095 CanQualType ParamType = Param->getType()->getCanonicalTypeUnqualified();
3096
3097 // Is it the same as our class type?
3098 CanQualType ClassTy = Context.getCanonicalTagType(TD: getParent());
3099 return ParamType == ClassTy;
3100}
3101
3102void CXXDestructorDecl::anchor() {}
3103
3104CXXDestructorDecl *CXXDestructorDecl::CreateDeserialized(ASTContext &C,
3105 GlobalDeclID ID) {
3106 return new (C, ID) CXXDestructorDecl(
3107 C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
3108 false, false, false, ConstexprSpecKind::Unspecified,
3109 /*TrailingRequiresClause=*/{});
3110}
3111
3112CXXDestructorDecl *CXXDestructorDecl::Create(
3113 ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
3114 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
3115 bool UsesFPIntrin, bool isInline, bool isImplicitlyDeclared,
3116 ConstexprSpecKind ConstexprKind,
3117 const AssociatedConstraint &TrailingRequiresClause) {
3118 assert(NameInfo.getName().getNameKind()
3119 == DeclarationName::CXXDestructorName &&
3120 "Name must refer to a destructor");
3121 return new (C, RD) CXXDestructorDecl(
3122 C, RD, StartLoc, NameInfo, T, TInfo, UsesFPIntrin, isInline,
3123 isImplicitlyDeclared, ConstexprKind, TrailingRequiresClause);
3124}
3125
3126void CXXDestructorDecl::setOperatorDelete(FunctionDecl *OD, Expr *ThisArg) {
3127 assert(!OD || (OD->getDeclName().getCXXOverloadedOperator() == OO_Delete));
3128 if (OD && !getASTContext().dtorHasOperatorDelete(
3129 Dtor: this, K: ASTContext::OperatorDeleteKind::Regular)) {
3130 getASTContext().addOperatorDeleteForVDtor(
3131 Dtor: this, OperatorDelete: OD, K: ASTContext::OperatorDeleteKind::Regular);
3132 getCanonicalDecl()->OperatorDeleteThisArg = ThisArg;
3133 if (auto *L = getASTMutationListener())
3134 L->ResolvedOperatorDelete(DD: cast<CXXDestructorDecl>(Val: getCanonicalDecl()), Delete: OD,
3135 ThisArg);
3136 }
3137}
3138
3139void CXXDestructorDecl::setOperatorGlobalDelete(FunctionDecl *OD) {
3140 // FIXME: C++23 [expr.delete] specifies that the delete operator will be
3141 // a usual deallocation function declared at global scope. A convenient
3142 // function to assert that is lacking; Sema::isUsualDeallocationFunction()
3143 // only works for CXXMethodDecl.
3144 assert(!OD ||
3145 (OD->getDeclName().getCXXOverloadedOperator() == OO_Delete &&
3146 OD->getDeclContext()->getRedeclContext()->isTranslationUnit()));
3147 if (OD && !getASTContext().dtorHasOperatorDelete(
3148 Dtor: this, K: ASTContext::OperatorDeleteKind::GlobalRegular)) {
3149 getASTContext().addOperatorDeleteForVDtor(
3150 Dtor: this, OperatorDelete: OD, K: ASTContext::OperatorDeleteKind::GlobalRegular);
3151 if (auto *L = getASTMutationListener())
3152 L->ResolvedOperatorGlobDelete(DD: cast<CXXDestructorDecl>(Val: getCanonicalDecl()),
3153 GlobDelete: OD);
3154 }
3155}
3156
3157void CXXDestructorDecl::setOperatorArrayDelete(FunctionDecl *OD) {
3158 assert(!OD ||
3159 (OD->getDeclName().getCXXOverloadedOperator() == OO_Array_Delete));
3160 if (OD && !getASTContext().dtorHasOperatorDelete(
3161 Dtor: this, K: ASTContext::OperatorDeleteKind::Array)) {
3162 getASTContext().addOperatorDeleteForVDtor(
3163 Dtor: this, OperatorDelete: OD, K: ASTContext::OperatorDeleteKind::Array);
3164 if (auto *L = getASTMutationListener())
3165 L->ResolvedOperatorArrayDelete(
3166 DD: cast<CXXDestructorDecl>(Val: getCanonicalDecl()), ArrayDelete: OD);
3167 }
3168}
3169
3170void CXXDestructorDecl::setGlobalOperatorArrayDelete(FunctionDecl *OD) {
3171 assert(!OD ||
3172 (OD->getDeclName().getCXXOverloadedOperator() == OO_Array_Delete &&
3173 OD->getDeclContext()->getRedeclContext()->isTranslationUnit()));
3174 if (OD && !getASTContext().dtorHasOperatorDelete(
3175 Dtor: this, K: ASTContext::OperatorDeleteKind::ArrayGlobal)) {
3176 getASTContext().addOperatorDeleteForVDtor(
3177 Dtor: this, OperatorDelete: OD, K: ASTContext::OperatorDeleteKind::ArrayGlobal);
3178 if (auto *L = getASTMutationListener())
3179 L->ResolvedOperatorGlobArrayDelete(
3180 DD: cast<CXXDestructorDecl>(Val: getCanonicalDecl()), GlobArrayDelete: OD);
3181 }
3182}
3183
3184const FunctionDecl *CXXDestructorDecl::getOperatorDelete() const {
3185 return getASTContext().getOperatorDeleteForVDtor(
3186 Dtor: this, K: ASTContext::OperatorDeleteKind::Regular);
3187}
3188
3189const FunctionDecl *CXXDestructorDecl::getOperatorGlobalDelete() const {
3190 return getASTContext().getOperatorDeleteForVDtor(
3191 Dtor: this, K: ASTContext::OperatorDeleteKind::GlobalRegular);
3192}
3193
3194const FunctionDecl *CXXDestructorDecl::getArrayOperatorDelete() const {
3195 return getASTContext().getOperatorDeleteForVDtor(
3196 Dtor: this, K: ASTContext::OperatorDeleteKind::Array);
3197}
3198
3199const FunctionDecl *CXXDestructorDecl::getGlobalArrayOperatorDelete() const {
3200 return getASTContext().getOperatorDeleteForVDtor(
3201 Dtor: this, K: ASTContext::OperatorDeleteKind::ArrayGlobal);
3202}
3203
3204bool CXXDestructorDecl::isCalledByDelete(const FunctionDecl *OpDel) const {
3205 // C++20 [expr.delete]p6: If the value of the operand of the delete-
3206 // expression is not a null pointer value and the selected deallocation
3207 // function (see below) is not a destroying operator delete, the delete-
3208 // expression will invoke the destructor (if any) for the object or the
3209 // elements of the array being deleted.
3210 //
3211 // This means we should not look at the destructor for a destroying
3212 // delete operator, as that destructor is never called, unless the
3213 // destructor is virtual (see [expr.delete]p8.1) because then the
3214 // selected operator depends on the dynamic type of the pointer.
3215 const FunctionDecl *SelectedOperatorDelete =
3216 OpDel ? OpDel : getOperatorDelete();
3217 if (!SelectedOperatorDelete)
3218 return true;
3219
3220 if (!SelectedOperatorDelete->isDestroyingOperatorDelete())
3221 return true;
3222
3223 // We have a destroying operator delete, so it depends on the dtor.
3224 return isVirtual();
3225}
3226
3227void CXXConversionDecl::anchor() {}
3228
3229CXXConversionDecl *CXXConversionDecl::CreateDeserialized(ASTContext &C,
3230 GlobalDeclID ID) {
3231 return new (C, ID) CXXConversionDecl(
3232 C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
3233 false, false, ExplicitSpecifier(), ConstexprSpecKind::Unspecified,
3234 SourceLocation(), /*TrailingRequiresClause=*/{});
3235}
3236
3237CXXConversionDecl *CXXConversionDecl::Create(
3238 ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc,
3239 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo,
3240 bool UsesFPIntrin, bool isInline, ExplicitSpecifier ES,
3241 ConstexprSpecKind ConstexprKind, SourceLocation EndLocation,
3242 const AssociatedConstraint &TrailingRequiresClause) {
3243 assert(NameInfo.getName().getNameKind()
3244 == DeclarationName::CXXConversionFunctionName &&
3245 "Name must refer to a conversion function");
3246 return new (C, RD) CXXConversionDecl(
3247 C, RD, StartLoc, NameInfo, T, TInfo, UsesFPIntrin, isInline, ES,
3248 ConstexprKind, EndLocation, TrailingRequiresClause);
3249}
3250
3251bool CXXConversionDecl::isLambdaToBlockPointerConversion() const {
3252 return isImplicit() && getParent()->isLambda() &&
3253 getConversionType()->isBlockPointerType();
3254}
3255
3256LinkageSpecDecl::LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc,
3257 SourceLocation LangLoc,
3258 LinkageSpecLanguageIDs lang, bool HasBraces)
3259 : Decl(LinkageSpec, DC, LangLoc), DeclContext(LinkageSpec),
3260 ExternLoc(ExternLoc), RBraceLoc(SourceLocation()) {
3261 setLanguage(lang);
3262 LinkageSpecDeclBits.HasBraces = HasBraces;
3263}
3264
3265void LinkageSpecDecl::anchor() {}
3266
3267LinkageSpecDecl *LinkageSpecDecl::Create(ASTContext &C, DeclContext *DC,
3268 SourceLocation ExternLoc,
3269 SourceLocation LangLoc,
3270 LinkageSpecLanguageIDs Lang,
3271 bool HasBraces) {
3272 return new (C, DC) LinkageSpecDecl(DC, ExternLoc, LangLoc, Lang, HasBraces);
3273}
3274
3275LinkageSpecDecl *LinkageSpecDecl::CreateDeserialized(ASTContext &C,
3276 GlobalDeclID ID) {
3277 return new (C, ID)
3278 LinkageSpecDecl(nullptr, SourceLocation(), SourceLocation(),
3279 LinkageSpecLanguageIDs::C, false);
3280}
3281
3282void UsingDirectiveDecl::anchor() {}
3283
3284UsingDirectiveDecl *UsingDirectiveDecl::Create(ASTContext &C, DeclContext *DC,
3285 SourceLocation L,
3286 SourceLocation NamespaceLoc,
3287 NestedNameSpecifierLoc QualifierLoc,
3288 SourceLocation IdentLoc,
3289 NamedDecl *Used,
3290 DeclContext *CommonAncestor) {
3291 if (auto *NS = dyn_cast_or_null<NamespaceDecl>(Val: Used))
3292 Used = NS->getFirstDecl();
3293 return new (C, DC) UsingDirectiveDecl(DC, L, NamespaceLoc, QualifierLoc,
3294 IdentLoc, Used, CommonAncestor);
3295}
3296
3297UsingDirectiveDecl *UsingDirectiveDecl::CreateDeserialized(ASTContext &C,
3298 GlobalDeclID ID) {
3299 return new (C, ID) UsingDirectiveDecl(nullptr, SourceLocation(),
3300 SourceLocation(),
3301 NestedNameSpecifierLoc(),
3302 SourceLocation(), nullptr, nullptr);
3303}
3304
3305NamespaceDecl *NamespaceBaseDecl::getNamespace() {
3306 if (auto *Alias = dyn_cast<NamespaceAliasDecl>(Val: this))
3307 return Alias->getNamespace();
3308 return cast<NamespaceDecl>(Val: this);
3309}
3310
3311NamespaceDecl *UsingDirectiveDecl::getNominatedNamespace() {
3312 if (auto *NA = dyn_cast_or_null<NamespaceAliasDecl>(Val: NominatedNamespace))
3313 return NA->getNamespace();
3314 return cast_or_null<NamespaceDecl>(Val: NominatedNamespace);
3315}
3316
3317NamespaceDecl::NamespaceDecl(ASTContext &C, DeclContext *DC, bool Inline,
3318 SourceLocation StartLoc, SourceLocation IdLoc,
3319 IdentifierInfo *Id, NamespaceDecl *PrevDecl,
3320 bool Nested)
3321 : NamespaceBaseDecl(Namespace, DC, IdLoc, Id), DeclContext(Namespace),
3322 redeclarable_base(C), LocStart(StartLoc) {
3323 setInline(Inline);
3324 setNested(Nested);
3325 setPreviousDecl(PrevDecl);
3326}
3327
3328NamespaceDecl *NamespaceDecl::Create(ASTContext &C, DeclContext *DC,
3329 bool Inline, SourceLocation StartLoc,
3330 SourceLocation IdLoc, IdentifierInfo *Id,
3331 NamespaceDecl *PrevDecl, bool Nested) {
3332 return new (C, DC)
3333 NamespaceDecl(C, DC, Inline, StartLoc, IdLoc, Id, PrevDecl, Nested);
3334}
3335
3336NamespaceDecl *NamespaceDecl::CreateDeserialized(ASTContext &C,
3337 GlobalDeclID ID) {
3338 return new (C, ID) NamespaceDecl(C, nullptr, false, SourceLocation(),
3339 SourceLocation(), nullptr, nullptr, false);
3340}
3341
3342NamespaceDecl *NamespaceDecl::getNextRedeclarationImpl() {
3343 return getNextRedeclaration();
3344}
3345
3346NamespaceDecl *NamespaceDecl::getPreviousDeclImpl() {
3347 return getPreviousDecl();
3348}
3349
3350NamespaceDecl *NamespaceDecl::getMostRecentDeclImpl() {
3351 return getMostRecentDecl();
3352}
3353
3354void NamespaceAliasDecl::anchor() {}
3355
3356NamespaceAliasDecl *NamespaceAliasDecl::getNextRedeclarationImpl() {
3357 return getNextRedeclaration();
3358}
3359
3360NamespaceAliasDecl *NamespaceAliasDecl::getPreviousDeclImpl() {
3361 return getPreviousDecl();
3362}
3363
3364NamespaceAliasDecl *NamespaceAliasDecl::getMostRecentDeclImpl() {
3365 return getMostRecentDecl();
3366}
3367
3368NamespaceAliasDecl *NamespaceAliasDecl::Create(
3369 ASTContext &C, DeclContext *DC, SourceLocation UsingLoc,
3370 SourceLocation AliasLoc, IdentifierInfo *Alias,
3371 NestedNameSpecifierLoc QualifierLoc, SourceLocation IdentLoc,
3372 NamespaceBaseDecl *Namespace) {
3373 // FIXME: Preserve the aliased namespace as written.
3374 if (auto *NS = dyn_cast_or_null<NamespaceDecl>(Val: Namespace))
3375 Namespace = NS->getFirstDecl();
3376 return new (C, DC) NamespaceAliasDecl(C, DC, UsingLoc, AliasLoc, Alias,
3377 QualifierLoc, IdentLoc, Namespace);
3378}
3379
3380NamespaceAliasDecl *NamespaceAliasDecl::CreateDeserialized(ASTContext &C,
3381 GlobalDeclID ID) {
3382 return new (C, ID) NamespaceAliasDecl(C, nullptr, SourceLocation(),
3383 SourceLocation(), nullptr,
3384 NestedNameSpecifierLoc(),
3385 SourceLocation(), nullptr);
3386}
3387
3388void LifetimeExtendedTemporaryDecl::anchor() {}
3389
3390/// Retrieve the storage duration for the materialized temporary.
3391StorageDuration LifetimeExtendedTemporaryDecl::getStorageDuration() const {
3392 const ValueDecl *ExtendingDecl = getExtendingDecl();
3393 if (!ExtendingDecl)
3394 return SD_FullExpression;
3395 // FIXME: This is not necessarily correct for a temporary materialized
3396 // within a default initializer.
3397 if (isa<FieldDecl>(Val: ExtendingDecl))
3398 return SD_Automatic;
3399 // FIXME: This only works because storage class specifiers are not allowed
3400 // on decomposition declarations.
3401 if (isa<BindingDecl>(Val: ExtendingDecl))
3402 return ExtendingDecl->getDeclContext()->isFunctionOrMethod() ? SD_Automatic
3403 : SD_Static;
3404 return cast<VarDecl>(Val: ExtendingDecl)->getStorageDuration();
3405}
3406
3407APValue *LifetimeExtendedTemporaryDecl::getOrCreateValue(bool MayCreate) const {
3408 assert(getStorageDuration() == SD_Static &&
3409 "don't need to cache the computed value for this temporary");
3410 if (MayCreate && !Value) {
3411 Value = (new (getASTContext()) APValue);
3412 getASTContext().addDestruction(Ptr: Value);
3413 }
3414 assert(Value && "may not be null");
3415 return Value;
3416}
3417
3418void UsingShadowDecl::anchor() {}
3419
3420UsingShadowDecl::UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC,
3421 SourceLocation Loc, DeclarationName Name,
3422 BaseUsingDecl *Introducer, NamedDecl *Target)
3423 : NamedDecl(K, DC, Loc, Name), redeclarable_base(C),
3424 UsingOrNextShadow(Introducer) {
3425 if (Target) {
3426 assert(!isa<UsingShadowDecl>(Target));
3427 setTargetDecl(Target);
3428 }
3429 setImplicit();
3430}
3431
3432UsingShadowDecl::UsingShadowDecl(Kind K, ASTContext &C, EmptyShell Empty)
3433 : NamedDecl(K, nullptr, SourceLocation(), DeclarationName()),
3434 redeclarable_base(C) {}
3435
3436UsingShadowDecl *UsingShadowDecl::CreateDeserialized(ASTContext &C,
3437 GlobalDeclID ID) {
3438 return new (C, ID) UsingShadowDecl(UsingShadow, C, EmptyShell());
3439}
3440
3441BaseUsingDecl *UsingShadowDecl::getIntroducer() const {
3442 const UsingShadowDecl *Shadow = this;
3443 while (const auto *NextShadow =
3444 dyn_cast<UsingShadowDecl>(Val: Shadow->UsingOrNextShadow))
3445 Shadow = NextShadow;
3446 return cast<BaseUsingDecl>(Val: Shadow->UsingOrNextShadow);
3447}
3448
3449void ConstructorUsingShadowDecl::anchor() {}
3450
3451ConstructorUsingShadowDecl *
3452ConstructorUsingShadowDecl::Create(ASTContext &C, DeclContext *DC,
3453 SourceLocation Loc, UsingDecl *Using,
3454 NamedDecl *Target, bool IsVirtual) {
3455 return new (C, DC) ConstructorUsingShadowDecl(C, DC, Loc, Using, Target,
3456 IsVirtual);
3457}
3458
3459ConstructorUsingShadowDecl *
3460ConstructorUsingShadowDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
3461 return new (C, ID) ConstructorUsingShadowDecl(C, EmptyShell());
3462}
3463
3464CXXRecordDecl *ConstructorUsingShadowDecl::getNominatedBaseClass() const {
3465 return getIntroducer()->getQualifier().getAsRecordDecl();
3466}
3467
3468void BaseUsingDecl::anchor() {}
3469
3470void BaseUsingDecl::addShadowDecl(UsingShadowDecl *S) {
3471 assert(!llvm::is_contained(shadows(), S) && "declaration already in set");
3472 assert(S->getIntroducer() == this);
3473
3474 if (FirstUsingShadow.getPointer())
3475 S->UsingOrNextShadow = FirstUsingShadow.getPointer();
3476 FirstUsingShadow.setPointer(S);
3477}
3478
3479void BaseUsingDecl::removeShadowDecl(UsingShadowDecl *S) {
3480 assert(llvm::is_contained(shadows(), S) && "declaration not in set");
3481 assert(S->getIntroducer() == this);
3482
3483 // Remove S from the shadow decl chain. This is O(n) but hopefully rare.
3484
3485 if (FirstUsingShadow.getPointer() == S) {
3486 FirstUsingShadow.setPointer(
3487 dyn_cast<UsingShadowDecl>(Val: S->UsingOrNextShadow));
3488 S->UsingOrNextShadow = this;
3489 return;
3490 }
3491
3492 UsingShadowDecl *Prev = FirstUsingShadow.getPointer();
3493 while (Prev->UsingOrNextShadow != S)
3494 Prev = cast<UsingShadowDecl>(Val: Prev->UsingOrNextShadow);
3495 Prev->UsingOrNextShadow = S->UsingOrNextShadow;
3496 S->UsingOrNextShadow = this;
3497}
3498
3499void UsingDecl::anchor() {}
3500
3501UsingDecl *UsingDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation UL,
3502 NestedNameSpecifierLoc QualifierLoc,
3503 const DeclarationNameInfo &NameInfo,
3504 bool HasTypename) {
3505 return new (C, DC) UsingDecl(DC, UL, QualifierLoc, NameInfo, HasTypename);
3506}
3507
3508UsingDecl *UsingDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
3509 return new (C, ID) UsingDecl(nullptr, SourceLocation(),
3510 NestedNameSpecifierLoc(), DeclarationNameInfo(),
3511 false);
3512}
3513
3514SourceRange UsingDecl::getSourceRange() const {
3515 SourceLocation Begin = isAccessDeclaration()
3516 ? getQualifierLoc().getBeginLoc() : UsingLocation;
3517 return SourceRange(Begin, getNameInfo().getEndLoc());
3518}
3519
3520void UsingEnumDecl::anchor() {}
3521
3522UsingEnumDecl *UsingEnumDecl::Create(ASTContext &C, DeclContext *DC,
3523 SourceLocation UL, SourceLocation EL,
3524 SourceLocation NL,
3525 TypeSourceInfo *EnumType) {
3526 return new (C, DC)
3527 UsingEnumDecl(DC, EnumType->getType()->castAsEnumDecl()->getDeclName(),
3528 UL, EL, NL, EnumType);
3529}
3530
3531UsingEnumDecl *UsingEnumDecl::CreateDeserialized(ASTContext &C,
3532 GlobalDeclID ID) {
3533 return new (C, ID)
3534 UsingEnumDecl(nullptr, DeclarationName(), SourceLocation(),
3535 SourceLocation(), SourceLocation(), nullptr);
3536}
3537
3538SourceRange UsingEnumDecl::getSourceRange() const {
3539 return SourceRange(UsingLocation, EnumType->getTypeLoc().getEndLoc());
3540}
3541
3542void UsingPackDecl::anchor() {}
3543
3544UsingPackDecl *UsingPackDecl::Create(ASTContext &C, DeclContext *DC,
3545 NamedDecl *InstantiatedFrom,
3546 ArrayRef<NamedDecl *> UsingDecls) {
3547 size_t Extra = additionalSizeToAlloc<NamedDecl *>(Counts: UsingDecls.size());
3548 return new (C, DC, Extra) UsingPackDecl(DC, InstantiatedFrom, UsingDecls);
3549}
3550
3551UsingPackDecl *UsingPackDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID,
3552 unsigned NumExpansions) {
3553 size_t Extra = additionalSizeToAlloc<NamedDecl *>(Counts: NumExpansions);
3554 auto *Result = new (C, ID, Extra) UsingPackDecl(nullptr, nullptr, {});
3555 Result->NumExpansions = NumExpansions;
3556 auto *Trail = Result->getTrailingObjects();
3557 std::uninitialized_fill_n(first: Trail, n: NumExpansions, x: nullptr);
3558 return Result;
3559}
3560
3561void UnresolvedUsingValueDecl::anchor() {}
3562
3563UnresolvedUsingValueDecl *
3564UnresolvedUsingValueDecl::Create(ASTContext &C, DeclContext *DC,
3565 SourceLocation UsingLoc,
3566 NestedNameSpecifierLoc QualifierLoc,
3567 const DeclarationNameInfo &NameInfo,
3568 SourceLocation EllipsisLoc) {
3569 return new (C, DC) UnresolvedUsingValueDecl(DC, C.DependentTy, UsingLoc,
3570 QualifierLoc, NameInfo,
3571 EllipsisLoc);
3572}
3573
3574UnresolvedUsingValueDecl *
3575UnresolvedUsingValueDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
3576 return new (C, ID) UnresolvedUsingValueDecl(nullptr, QualType(),
3577 SourceLocation(),
3578 NestedNameSpecifierLoc(),
3579 DeclarationNameInfo(),
3580 SourceLocation());
3581}
3582
3583SourceRange UnresolvedUsingValueDecl::getSourceRange() const {
3584 SourceLocation Begin = isAccessDeclaration()
3585 ? getQualifierLoc().getBeginLoc() : UsingLocation;
3586 return SourceRange(Begin, getNameInfo().getEndLoc());
3587}
3588
3589void UnresolvedUsingTypenameDecl::anchor() {}
3590
3591UnresolvedUsingTypenameDecl *
3592UnresolvedUsingTypenameDecl::Create(ASTContext &C, DeclContext *DC,
3593 SourceLocation UsingLoc,
3594 SourceLocation TypenameLoc,
3595 NestedNameSpecifierLoc QualifierLoc,
3596 SourceLocation TargetNameLoc,
3597 DeclarationName TargetName,
3598 SourceLocation EllipsisLoc) {
3599 return new (C, DC) UnresolvedUsingTypenameDecl(
3600 DC, UsingLoc, TypenameLoc, QualifierLoc, TargetNameLoc,
3601 TargetName.getAsIdentifierInfo(), EllipsisLoc);
3602}
3603
3604UnresolvedUsingTypenameDecl *
3605UnresolvedUsingTypenameDecl::CreateDeserialized(ASTContext &C,
3606 GlobalDeclID ID) {
3607 return new (C, ID) UnresolvedUsingTypenameDecl(
3608 nullptr, SourceLocation(), SourceLocation(), NestedNameSpecifierLoc(),
3609 SourceLocation(), nullptr, SourceLocation());
3610}
3611
3612UnresolvedUsingIfExistsDecl *
3613UnresolvedUsingIfExistsDecl::Create(ASTContext &Ctx, DeclContext *DC,
3614 SourceLocation Loc, DeclarationName Name) {
3615 return new (Ctx, DC) UnresolvedUsingIfExistsDecl(DC, Loc, Name);
3616}
3617
3618UnresolvedUsingIfExistsDecl *
3619UnresolvedUsingIfExistsDecl::CreateDeserialized(ASTContext &Ctx,
3620 GlobalDeclID ID) {
3621 return new (Ctx, ID)
3622 UnresolvedUsingIfExistsDecl(nullptr, SourceLocation(), DeclarationName());
3623}
3624
3625UnresolvedUsingIfExistsDecl::UnresolvedUsingIfExistsDecl(DeclContext *DC,
3626 SourceLocation Loc,
3627 DeclarationName Name)
3628 : NamedDecl(Decl::UnresolvedUsingIfExists, DC, Loc, Name) {}
3629
3630void UnresolvedUsingIfExistsDecl::anchor() {}
3631
3632void StaticAssertDecl::anchor() {}
3633
3634StaticAssertDecl *StaticAssertDecl::Create(ASTContext &C, DeclContext *DC,
3635 SourceLocation StaticAssertLoc,
3636 Expr *AssertExpr, Expr *Message,
3637 SourceLocation RParenLoc,
3638 bool Failed) {
3639 return new (C, DC) StaticAssertDecl(DC, StaticAssertLoc, AssertExpr, Message,
3640 RParenLoc, Failed);
3641}
3642
3643StaticAssertDecl *StaticAssertDecl::CreateDeserialized(ASTContext &C,
3644 GlobalDeclID ID) {
3645 return new (C, ID) StaticAssertDecl(nullptr, SourceLocation(), nullptr,
3646 nullptr, SourceLocation(), false);
3647}
3648
3649VarDecl *ValueDecl::getPotentiallyDecomposedVarDecl() {
3650 assert((isa<VarDecl, BindingDecl>(this)) &&
3651 "expected a VarDecl or a BindingDecl");
3652 if (auto *Var = llvm::dyn_cast<VarDecl>(Val: this))
3653 return Var;
3654 if (auto *BD = llvm::dyn_cast<BindingDecl>(Val: this))
3655 return llvm::dyn_cast_if_present<VarDecl>(Val: BD->getDecomposedDecl());
3656 return nullptr;
3657}
3658
3659void BindingDecl::anchor() {}
3660
3661BindingDecl *BindingDecl::Create(ASTContext &C, DeclContext *DC,
3662 SourceLocation IdLoc, IdentifierInfo *Id,
3663 QualType T) {
3664 return new (C, DC) BindingDecl(DC, IdLoc, Id, T);
3665}
3666
3667BindingDecl *BindingDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
3668 return new (C, ID)
3669 BindingDecl(nullptr, SourceLocation(), nullptr, QualType());
3670}
3671
3672VarDecl *BindingDecl::getHoldingVar() const {
3673 Expr *B = getBinding();
3674 if (!B)
3675 return nullptr;
3676 auto *DRE = dyn_cast<DeclRefExpr>(Val: B->IgnoreImplicit());
3677 if (!DRE)
3678 return nullptr;
3679
3680 auto *VD = cast<VarDecl>(Val: DRE->getDecl());
3681 assert(VD->isImplicit() && "holding var for binding decl not implicit");
3682 return VD;
3683}
3684
3685ArrayRef<BindingDecl *> BindingDecl::getBindingPackDecls() const {
3686 assert(Binding && "expecting a pack expr");
3687 auto *FP = cast<FunctionParmPackExpr>(Val: Binding);
3688 ValueDecl *const *First = FP->getNumExpansions() > 0 ? FP->begin() : nullptr;
3689 assert((!First || isa<BindingDecl>(*First)) && "expecting a BindingDecl");
3690 return ArrayRef<BindingDecl *>(reinterpret_cast<BindingDecl *const *>(First),
3691 FP->getNumExpansions());
3692}
3693
3694void DecompositionDecl::anchor() {}
3695
3696DecompositionDecl *DecompositionDecl::Create(ASTContext &C, DeclContext *DC,
3697 SourceLocation StartLoc,
3698 SourceLocation LSquareLoc,
3699 QualType T, TypeSourceInfo *TInfo,
3700 StorageClass SC,
3701 ArrayRef<BindingDecl *> Bindings) {
3702 size_t Extra = additionalSizeToAlloc<BindingDecl *>(Counts: Bindings.size());
3703 return new (C, DC, Extra)
3704 DecompositionDecl(C, DC, StartLoc, LSquareLoc, T, TInfo, SC, Bindings);
3705}
3706
3707DecompositionDecl *DecompositionDecl::CreateDeserialized(ASTContext &C,
3708 GlobalDeclID ID,
3709 unsigned NumBindings) {
3710 size_t Extra = additionalSizeToAlloc<BindingDecl *>(Counts: NumBindings);
3711 auto *Result = new (C, ID, Extra)
3712 DecompositionDecl(C, nullptr, SourceLocation(), SourceLocation(),
3713 QualType(), nullptr, StorageClass(), {});
3714 // Set up and clean out the bindings array.
3715 Result->NumBindings = NumBindings;
3716 auto *Trail = Result->getTrailingObjects();
3717 std::uninitialized_fill_n(first: Trail, n: NumBindings, x: nullptr);
3718 return Result;
3719}
3720
3721void DecompositionDecl::printName(llvm::raw_ostream &OS,
3722 const PrintingPolicy &Policy) const {
3723 OS << '[';
3724 bool Comma = false;
3725 for (const auto *B : bindings()) {
3726 if (Comma)
3727 OS << ", ";
3728 B->printName(OS, Policy);
3729 Comma = true;
3730 }
3731 OS << ']';
3732}
3733
3734void MSPropertyDecl::anchor() {}
3735
3736MSPropertyDecl *MSPropertyDecl::Create(ASTContext &C, DeclContext *DC,
3737 SourceLocation L, DeclarationName N,
3738 QualType T, TypeSourceInfo *TInfo,
3739 SourceLocation StartL,
3740 IdentifierInfo *Getter,
3741 IdentifierInfo *Setter) {
3742 return new (C, DC) MSPropertyDecl(DC, L, N, T, TInfo, StartL, Getter, Setter);
3743}
3744
3745MSPropertyDecl *MSPropertyDecl::CreateDeserialized(ASTContext &C,
3746 GlobalDeclID ID) {
3747 return new (C, ID) MSPropertyDecl(nullptr, SourceLocation(),
3748 DeclarationName(), QualType(), nullptr,
3749 SourceLocation(), nullptr, nullptr);
3750}
3751
3752void MSGuidDecl::anchor() {}
3753
3754MSGuidDecl::MSGuidDecl(DeclContext *DC, QualType T, Parts P)
3755 : ValueDecl(Decl::MSGuid, DC, SourceLocation(), DeclarationName(), T),
3756 PartVal(P) {}
3757
3758MSGuidDecl *MSGuidDecl::Create(const ASTContext &C, QualType T, Parts P) {
3759 DeclContext *DC = C.getTranslationUnitDecl();
3760 return new (C, DC) MSGuidDecl(DC, T, P);
3761}
3762
3763MSGuidDecl *MSGuidDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
3764 return new (C, ID) MSGuidDecl(nullptr, QualType(), Parts());
3765}
3766
3767void MSGuidDecl::printName(llvm::raw_ostream &OS,
3768 const PrintingPolicy &) const {
3769 OS << llvm::format(Fmt: "GUID{%08" PRIx32 "-%04" PRIx16 "-%04" PRIx16 "-",
3770 Vals: PartVal.Part1, Vals: PartVal.Part2, Vals: PartVal.Part3);
3771 unsigned I = 0;
3772 for (uint8_t Byte : PartVal.Part4And5) {
3773 OS << llvm::format(Fmt: "%02" PRIx8, Vals: Byte);
3774 if (++I == 2)
3775 OS << '-';
3776 }
3777 OS << '}';
3778}
3779
3780/// Determine if T is a valid 'struct _GUID' of the shape that we expect.
3781static bool isValidStructGUID(ASTContext &Ctx, QualType T) {
3782 // FIXME: We only need to check this once, not once each time we compute a
3783 // GUID APValue.
3784 using MatcherRef = llvm::function_ref<bool(QualType)>;
3785
3786 auto IsInt = [&Ctx](unsigned N) {
3787 return [&Ctx, N](QualType T) {
3788 return T->isUnsignedIntegerOrEnumerationType() &&
3789 Ctx.getIntWidth(T) == N;
3790 };
3791 };
3792
3793 auto IsArray = [&Ctx](MatcherRef Elem, unsigned N) {
3794 return [&Ctx, Elem, N](QualType T) {
3795 const ConstantArrayType *CAT = Ctx.getAsConstantArrayType(T);
3796 return CAT && CAT->getSize() == N && Elem(CAT->getElementType());
3797 };
3798 };
3799
3800 auto IsStruct = [](std::initializer_list<MatcherRef> Fields) {
3801 return [Fields](QualType T) {
3802 const RecordDecl *RD = T->getAsRecordDecl();
3803 if (!RD || RD->isUnion())
3804 return false;
3805 RD = RD->getDefinition();
3806 if (!RD)
3807 return false;
3808 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(Val: RD))
3809 if (CXXRD->getNumBases())
3810 return false;
3811 auto MatcherIt = Fields.begin();
3812 for (const FieldDecl *FD : RD->fields()) {
3813 if (FD->isUnnamedBitField())
3814 continue;
3815 if (FD->isBitField() || MatcherIt == Fields.end() ||
3816 !(*MatcherIt)(FD->getType()))
3817 return false;
3818 ++MatcherIt;
3819 }
3820 return MatcherIt == Fields.end();
3821 };
3822 };
3823
3824 // We expect an {i32, i16, i16, [8 x i8]}.
3825 return IsStruct({IsInt(32), IsInt(16), IsInt(16), IsArray(IsInt(8), 8)})(T);
3826}
3827
3828APValue &MSGuidDecl::getAsAPValue() const {
3829 if (APVal.isAbsent() && isValidStructGUID(Ctx&: getASTContext(), T: getType())) {
3830 using llvm::APInt;
3831 using llvm::APSInt;
3832 APVal = APValue(APValue::UninitStruct(), 0, 4);
3833 APVal.getStructField(i: 0) = APValue(APSInt(APInt(32, PartVal.Part1), true));
3834 APVal.getStructField(i: 1) = APValue(APSInt(APInt(16, PartVal.Part2), true));
3835 APVal.getStructField(i: 2) = APValue(APSInt(APInt(16, PartVal.Part3), true));
3836 APValue &Arr = APVal.getStructField(i: 3) =
3837 APValue(APValue::UninitArray(), 8, 8);
3838 for (unsigned I = 0; I != 8; ++I) {
3839 Arr.getArrayInitializedElt(I) =
3840 APValue(APSInt(APInt(8, PartVal.Part4And5[I]), true));
3841 }
3842 // Register this APValue to be destroyed if necessary. (Note that the
3843 // MSGuidDecl destructor is never run.)
3844 getASTContext().addDestruction(Ptr: &APVal);
3845 }
3846
3847 return APVal;
3848}
3849
3850void UnnamedGlobalConstantDecl::anchor() {}
3851
3852UnnamedGlobalConstantDecl::UnnamedGlobalConstantDecl(const ASTContext &C,
3853 DeclContext *DC,
3854 QualType Ty,
3855 const APValue &Val)
3856 : ValueDecl(Decl::UnnamedGlobalConstant, DC, SourceLocation(),
3857 DeclarationName(), Ty),
3858 Value(Val) {
3859 // Cleanup the embedded APValue if required (note that our destructor is never
3860 // run)
3861 if (Value.needsCleanup())
3862 C.addDestruction(Ptr: &Value);
3863}
3864
3865UnnamedGlobalConstantDecl *
3866UnnamedGlobalConstantDecl::Create(const ASTContext &C, QualType T,
3867 const APValue &Value) {
3868 DeclContext *DC = C.getTranslationUnitDecl();
3869 return new (C, DC) UnnamedGlobalConstantDecl(C, DC, T, Value);
3870}
3871
3872UnnamedGlobalConstantDecl *
3873UnnamedGlobalConstantDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
3874 return new (C, ID)
3875 UnnamedGlobalConstantDecl(C, nullptr, QualType(), APValue());
3876}
3877
3878void UnnamedGlobalConstantDecl::printName(llvm::raw_ostream &OS,
3879 const PrintingPolicy &) const {
3880 OS << "unnamed-global-constant";
3881}
3882
3883static const char *getAccessName(AccessSpecifier AS) {
3884 switch (AS) {
3885 case AS_none:
3886 llvm_unreachable("Invalid access specifier!");
3887 case AS_public:
3888 return "public";
3889 case AS_private:
3890 return "private";
3891 case AS_protected:
3892 return "protected";
3893 }
3894 llvm_unreachable("Invalid access specifier!");
3895}
3896
3897const StreamingDiagnostic &clang::operator<<(const StreamingDiagnostic &DB,
3898 AccessSpecifier AS) {
3899 return DB << getAccessName(AS);
3900}
3901