1 //===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for initializers.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/Initialization.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/ExprCXX.h"
18 #include "clang/AST/ExprObjC.h"
19 #include "clang/AST/TypeLoc.h"
20 #include "clang/Basic/TargetInfo.h"
21 #include "clang/Sema/Designator.h"
22 #include "clang/Sema/Lookup.h"
23 #include "clang/Sema/SemaInternal.h"
24 #include "llvm/ADT/APInt.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/raw_ostream.h"
29 using namespace clang;
31 //===----------------------------------------------------------------------===//
32 // Sema Initialization Checking
33 //===----------------------------------------------------------------------===//
35 /// \brief Check whether T is compatible with a wide character type (wchar_t,
36 /// char16_t or char32_t).
37 static bool IsWideCharCompatible(QualType T, ASTContext &Context) {
38 if (Context.typesAreCompatible(Context.getWideCharType(), T))
40 if (Context.getLangOpts().CPlusPlus || Context.getLangOpts().C11) {
41 return Context.typesAreCompatible(Context.Char16Ty, T) ||
42 Context.typesAreCompatible(Context.Char32Ty, T);
47 enum StringInitFailureKind {
49 SIF_NarrowStringIntoWideChar,
50 SIF_WideStringIntoChar,
51 SIF_IncompatWideStringIntoWideChar,
55 /// \brief Check whether the array of type AT can be initialized by the Init
56 /// expression by means of string initialization. Returns SIF_None if so,
57 /// otherwise returns a StringInitFailureKind that describes why the
58 /// initialization would not work.
59 static StringInitFailureKind IsStringInit(Expr *Init, const ArrayType *AT,
60 ASTContext &Context) {
61 if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT))
64 // See if this is a string literal or @encode.
65 Init = Init->IgnoreParens();
67 // Handle @encode, which is a narrow string.
68 if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
71 // Otherwise we can only handle string literals.
72 StringLiteral *SL = dyn_cast<StringLiteral>(Init);
76 const QualType ElemTy =
77 Context.getCanonicalType(AT->getElementType()).getUnqualifiedType();
79 switch (SL->getKind()) {
80 case StringLiteral::Ascii:
81 case StringLiteral::UTF8:
82 // char array can be initialized with a narrow string.
83 // Only allow char x[] = "foo"; not char x[] = L"foo";
84 if (ElemTy->isCharType())
86 if (IsWideCharCompatible(ElemTy, Context))
87 return SIF_NarrowStringIntoWideChar;
89 // C99 6.7.8p15 (with correction from DR343), or C11 6.7.9p15:
90 // "An array with element type compatible with a qualified or unqualified
91 // version of wchar_t, char16_t, or char32_t may be initialized by a wide
92 // string literal with the corresponding encoding prefix (L, u, or U,
93 // respectively), optionally enclosed in braces.
94 case StringLiteral::UTF16:
95 if (Context.typesAreCompatible(Context.Char16Ty, ElemTy))
97 if (ElemTy->isCharType())
98 return SIF_WideStringIntoChar;
99 if (IsWideCharCompatible(ElemTy, Context))
100 return SIF_IncompatWideStringIntoWideChar;
102 case StringLiteral::UTF32:
103 if (Context.typesAreCompatible(Context.Char32Ty, ElemTy))
105 if (ElemTy->isCharType())
106 return SIF_WideStringIntoChar;
107 if (IsWideCharCompatible(ElemTy, Context))
108 return SIF_IncompatWideStringIntoWideChar;
110 case StringLiteral::Wide:
111 if (Context.typesAreCompatible(Context.getWideCharType(), ElemTy))
113 if (ElemTy->isCharType())
114 return SIF_WideStringIntoChar;
115 if (IsWideCharCompatible(ElemTy, Context))
116 return SIF_IncompatWideStringIntoWideChar;
120 llvm_unreachable("missed a StringLiteral kind?");
123 static StringInitFailureKind IsStringInit(Expr *init, QualType declType,
124 ASTContext &Context) {
125 const ArrayType *arrayType = Context.getAsArrayType(declType);
128 return IsStringInit(init, arrayType, Context);
131 /// Update the type of a string literal, including any surrounding parentheses,
132 /// to match the type of the object which it is initializing.
133 static void updateStringLiteralType(Expr *E, QualType Ty) {
136 if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E))
138 else if (ParenExpr *PE = dyn_cast<ParenExpr>(E))
139 E = PE->getSubExpr();
140 else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
141 E = UO->getSubExpr();
142 else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E))
143 E = GSE->getResultExpr();
145 llvm_unreachable("unexpected expr in string literal init");
149 static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT,
151 // Get the length of the string as parsed.
152 auto *ConstantArrayTy =
153 cast<ConstantArrayType>(Str->getType()->getUnqualifiedDesugaredType());
154 uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue();
156 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
157 // C99 6.7.8p14. We have an array of character type with unknown size
158 // being initialized to a string literal.
159 llvm::APInt ConstVal(32, StrLength);
160 // Return a new array type (C99 6.7.8p22).
161 DeclT = S.Context.getConstantArrayType(IAT->getElementType(),
163 ArrayType::Normal, 0);
164 updateStringLiteralType(Str, DeclT);
168 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
170 // We have an array of character type with known size. However,
171 // the size may be smaller or larger than the string we are initializing.
172 // FIXME: Avoid truncation for 64-bit length strings.
173 if (S.getLangOpts().CPlusPlus) {
174 if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) {
175 // For Pascal strings it's OK to strip off the terminating null character,
176 // so the example below is valid:
178 // unsigned char a[2] = "\pa";
183 // [dcl.init.string]p2
184 if (StrLength > CAT->getSize().getZExtValue())
185 S.Diag(Str->getLocStart(),
186 diag::err_initializer_string_for_char_array_too_long)
187 << Str->getSourceRange();
190 if (StrLength-1 > CAT->getSize().getZExtValue())
191 S.Diag(Str->getLocStart(),
192 diag::ext_initializer_string_for_char_array_too_long)
193 << Str->getSourceRange();
196 // Set the type to the actual size that we are initializing. If we have
198 // char x[1] = "foo";
199 // then this will set the string literal's type to char[1].
200 updateStringLiteralType(Str, DeclT);
203 //===----------------------------------------------------------------------===//
204 // Semantic checking for initializer lists.
205 //===----------------------------------------------------------------------===//
207 /// @brief Semantic checking for initializer lists.
209 /// The InitListChecker class contains a set of routines that each
210 /// handle the initialization of a certain kind of entity, e.g.,
211 /// arrays, vectors, struct/union types, scalars, etc. The
212 /// InitListChecker itself performs a recursive walk of the subobject
213 /// structure of the type to be initialized, while stepping through
214 /// the initializer list one element at a time. The IList and Index
215 /// parameters to each of the Check* routines contain the active
216 /// (syntactic) initializer list and the index into that initializer
217 /// list that represents the current initializer. Each routine is
218 /// responsible for moving that Index forward as it consumes elements.
220 /// Each Check* routine also has a StructuredList/StructuredIndex
221 /// arguments, which contains the current "structured" (semantic)
222 /// initializer list and the index into that initializer list where we
223 /// are copying initializers as we map them over to the semantic
224 /// list. Once we have completed our recursive walk of the subobject
225 /// structure, we will have constructed a full semantic initializer
228 /// C99 designators cause changes in the initializer list traversal,
229 /// because they make the initialization "jump" into a specific
230 /// subobject and then continue the initialization from that
231 /// point. CheckDesignatedInitializer() recursively steps into the
232 /// designated subobject and manages backing out the recursion to
233 /// initialize the subobjects after the one designated.
235 class InitListChecker {
238 bool VerifyOnly; // no diagnostics, no structure building
239 llvm::DenseMap<InitListExpr *, InitListExpr *> SyntacticToSemantic;
240 InitListExpr *FullyStructuredList;
242 void CheckImplicitInitList(const InitializedEntity &Entity,
243 InitListExpr *ParentIList, QualType T,
244 unsigned &Index, InitListExpr *StructuredList,
245 unsigned &StructuredIndex);
246 void CheckExplicitInitList(const InitializedEntity &Entity,
247 InitListExpr *IList, QualType &T,
248 InitListExpr *StructuredList,
249 bool TopLevelObject = false);
250 void CheckListElementTypes(const InitializedEntity &Entity,
251 InitListExpr *IList, QualType &DeclType,
252 bool SubobjectIsDesignatorContext,
254 InitListExpr *StructuredList,
255 unsigned &StructuredIndex,
256 bool TopLevelObject = false);
257 void CheckSubElementType(const InitializedEntity &Entity,
258 InitListExpr *IList, QualType ElemType,
260 InitListExpr *StructuredList,
261 unsigned &StructuredIndex);
262 void CheckComplexType(const InitializedEntity &Entity,
263 InitListExpr *IList, QualType DeclType,
265 InitListExpr *StructuredList,
266 unsigned &StructuredIndex);
267 void CheckScalarType(const InitializedEntity &Entity,
268 InitListExpr *IList, QualType DeclType,
270 InitListExpr *StructuredList,
271 unsigned &StructuredIndex);
272 void CheckReferenceType(const InitializedEntity &Entity,
273 InitListExpr *IList, QualType DeclType,
275 InitListExpr *StructuredList,
276 unsigned &StructuredIndex);
277 void CheckVectorType(const InitializedEntity &Entity,
278 InitListExpr *IList, QualType DeclType, unsigned &Index,
279 InitListExpr *StructuredList,
280 unsigned &StructuredIndex);
281 void CheckStructUnionTypes(const InitializedEntity &Entity,
282 InitListExpr *IList, QualType DeclType,
283 RecordDecl::field_iterator Field,
284 bool SubobjectIsDesignatorContext, unsigned &Index,
285 InitListExpr *StructuredList,
286 unsigned &StructuredIndex,
287 bool TopLevelObject = false);
288 void CheckArrayType(const InitializedEntity &Entity,
289 InitListExpr *IList, QualType &DeclType,
290 llvm::APSInt elementIndex,
291 bool SubobjectIsDesignatorContext, unsigned &Index,
292 InitListExpr *StructuredList,
293 unsigned &StructuredIndex);
294 bool CheckDesignatedInitializer(const InitializedEntity &Entity,
295 InitListExpr *IList, DesignatedInitExpr *DIE,
297 QualType &CurrentObjectType,
298 RecordDecl::field_iterator *NextField,
299 llvm::APSInt *NextElementIndex,
301 InitListExpr *StructuredList,
302 unsigned &StructuredIndex,
303 bool FinishSubobjectInit,
304 bool TopLevelObject);
305 InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
306 QualType CurrentObjectType,
307 InitListExpr *StructuredList,
308 unsigned StructuredIndex,
309 SourceRange InitRange);
310 void UpdateStructuredListElement(InitListExpr *StructuredList,
311 unsigned &StructuredIndex,
313 int numArrayElements(QualType DeclType);
314 int numStructUnionElements(QualType DeclType);
316 static ExprResult PerformEmptyInit(Sema &SemaRef,
318 const InitializedEntity &Entity,
320 void FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
321 const InitializedEntity &ParentEntity,
322 InitListExpr *ILE, bool &RequiresSecondPass);
323 void FillInEmptyInitializations(const InitializedEntity &Entity,
324 InitListExpr *ILE, bool &RequiresSecondPass);
325 bool CheckFlexibleArrayInit(const InitializedEntity &Entity,
326 Expr *InitExpr, FieldDecl *Field,
327 bool TopLevelObject);
328 void CheckEmptyInitializable(const InitializedEntity &Entity,
332 InitListChecker(Sema &S, const InitializedEntity &Entity,
333 InitListExpr *IL, QualType &T, bool VerifyOnly);
334 bool HadError() { return hadError; }
336 // @brief Retrieves the fully-structured initializer list used for
337 // semantic analysis and code generation.
338 InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
340 } // end anonymous namespace
342 ExprResult InitListChecker::PerformEmptyInit(Sema &SemaRef,
344 const InitializedEntity &Entity,
346 InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc,
348 MultiExprArg SubInit;
350 InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc);
352 // C++ [dcl.init.aggr]p7:
353 // If there are fewer initializer-clauses in the list than there are
354 // members in the aggregate, then each member not explicitly initialized
356 bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 &&
357 Entity.getType()->getBaseElementTypeUnsafe()->isRecordType();
360 // shall be initialized [...] from an empty initializer list.
362 // We apply the resolution of this DR to C++11 but not C++98, since C++98
363 // does not have useful semantics for initialization from an init list.
364 // We treat this as copy-initialization, because aggregate initialization
365 // always performs copy-initialization on its elements.
367 // Only do this if we're initializing a class type, to avoid filling in
368 // the initializer list where possible.
369 InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context)
370 InitListExpr(SemaRef.Context, Loc, None, Loc);
371 InitExpr->setType(SemaRef.Context.VoidTy);
373 Kind = InitializationKind::CreateCopy(Loc, Loc);
376 // shall be value-initialized.
379 InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit);
380 // libstdc++4.6 marks the vector default constructor as explicit in
381 // _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case.
382 // stlport does so too. Look for std::__debug for libstdc++, and for
383 // std:: for stlport. This is effectively a compiler-side implementation of
385 if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() ==
386 InitializationSequence::FK_ExplicitConstructor) {
387 OverloadCandidateSet::iterator Best;
388 OverloadingResult O =
389 InitSeq.getFailedCandidateSet()
390 .BestViableFunction(SemaRef, Kind.getLocation(), Best);
392 assert(O == OR_Success && "Inconsistent overload resolution");
393 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
394 CXXRecordDecl *R = CtorDecl->getParent();
396 if (CtorDecl->getMinRequiredArguments() == 0 &&
397 CtorDecl->isExplicit() && R->getDeclName() &&
398 SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) {
401 bool IsInStd = false;
402 for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext());
403 ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) {
404 if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND))
408 if (IsInStd && llvm::StringSwitch<bool>(R->getName())
409 .Cases("basic_string", "deque", "forward_list", true)
410 .Cases("list", "map", "multimap", "multiset", true)
411 .Cases("priority_queue", "queue", "set", "stack", true)
412 .Cases("unordered_map", "unordered_set", "vector", true)
414 InitSeq.InitializeFrom(
416 InitializationKind::CreateValue(Loc, Loc, Loc, true),
417 MultiExprArg(), /*TopLevelOfInitList=*/false);
418 // Emit a warning for this. System header warnings aren't shown
419 // by default, but people working on system headers should see it.
421 SemaRef.Diag(CtorDecl->getLocation(),
422 diag::warn_invalid_initializer_from_system_header);
423 SemaRef.Diag(Entity.getDecl()->getLocation(),
424 diag::note_used_in_initialization_here);
431 InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit);
432 if (Entity.getKind() == InitializedEntity::EK_Member)
433 SemaRef.Diag(Entity.getDecl()->getLocation(),
434 diag::note_in_omitted_aggregate_initializer)
435 << /*field*/1 << Entity.getDecl();
436 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement)
437 SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer)
438 << /*array element*/0 << Entity.getElementIndex();
443 return VerifyOnly ? ExprResult(static_cast<Expr *>(nullptr))
444 : InitSeq.Perform(SemaRef, Entity, Kind, SubInit);
447 void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity,
448 SourceLocation Loc) {
450 "CheckEmptyInitializable is only inteded for verification mode.");
451 if (PerformEmptyInit(SemaRef, Loc, Entity, /*VerifyOnly*/true).isInvalid())
455 void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
456 const InitializedEntity &ParentEntity,
458 bool &RequiresSecondPass) {
459 SourceLocation Loc = ILE->getLocEnd();
460 unsigned NumInits = ILE->getNumInits();
461 InitializedEntity MemberEntity
462 = InitializedEntity::InitializeMember(Field, &ParentEntity);
463 if (Init >= NumInits || !ILE->getInit(Init)) {
464 // C++1y [dcl.init.aggr]p7:
465 // If there are fewer initializer-clauses in the list than there are
466 // members in the aggregate, then each member not explicitly initialized
467 // shall be initialized from its brace-or-equal-initializer [...]
468 if (Field->hasInClassInitializer()) {
469 ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field);
470 if (DIE.isInvalid()) {
475 ILE->setInit(Init, DIE.get());
477 ILE->updateInit(SemaRef.Context, Init, DIE.get());
478 RequiresSecondPass = true;
483 if (Field->getType()->isReferenceType()) {
484 // C++ [dcl.init.aggr]p9:
485 // If an incomplete or empty initializer-list leaves a
486 // member of reference type uninitialized, the program is
488 SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
490 << ILE->getSyntacticForm()->getSourceRange();
491 SemaRef.Diag(Field->getLocation(),
492 diag::note_uninit_reference_member);
497 ExprResult MemberInit = PerformEmptyInit(SemaRef, Loc, MemberEntity,
498 /*VerifyOnly*/false);
499 if (MemberInit.isInvalid()) {
506 } else if (Init < NumInits) {
507 ILE->setInit(Init, MemberInit.getAs<Expr>());
508 } else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) {
509 // Empty initialization requires a constructor call, so
510 // extend the initializer list to include the constructor
511 // call and make a note that we'll need to take another pass
512 // through the initializer list.
513 ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>());
514 RequiresSecondPass = true;
516 } else if (InitListExpr *InnerILE
517 = dyn_cast<InitListExpr>(ILE->getInit(Init)))
518 FillInEmptyInitializations(MemberEntity, InnerILE,
522 /// Recursively replaces NULL values within the given initializer list
523 /// with expressions that perform value-initialization of the
524 /// appropriate type.
526 InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity,
528 bool &RequiresSecondPass) {
529 assert((ILE->getType() != SemaRef.Context.VoidTy) &&
530 "Should not have void type");
532 if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) {
533 const RecordDecl *RDecl = RType->getDecl();
534 if (RDecl->isUnion() && ILE->getInitializedFieldInUnion())
535 FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(),
536 Entity, ILE, RequiresSecondPass);
537 else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) &&
538 cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) {
539 for (auto *Field : RDecl->fields()) {
540 if (Field->hasInClassInitializer()) {
541 FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass);
547 for (auto *Field : RDecl->fields()) {
548 if (Field->isUnnamedBitfield())
554 FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass);
560 // Only look at the first initialization of a union.
561 if (RDecl->isUnion())
569 QualType ElementType;
571 InitializedEntity ElementEntity = Entity;
572 unsigned NumInits = ILE->getNumInits();
573 unsigned NumElements = NumInits;
574 if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
575 ElementType = AType->getElementType();
576 if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType))
577 NumElements = CAType->getSize().getZExtValue();
578 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
580 } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) {
581 ElementType = VType->getElementType();
582 NumElements = VType->getNumElements();
583 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
586 ElementType = ILE->getType();
588 for (unsigned Init = 0; Init != NumElements; ++Init) {
592 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement ||
593 ElementEntity.getKind() == InitializedEntity::EK_VectorElement)
594 ElementEntity.setElementIndex(Init);
596 Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr);
597 if (!InitExpr && !ILE->hasArrayFiller()) {
598 ExprResult ElementInit = PerformEmptyInit(SemaRef, ILE->getLocEnd(),
600 /*VerifyOnly*/false);
601 if (ElementInit.isInvalid()) {
608 } else if (Init < NumInits) {
609 // For arrays, just set the expression used for value-initialization
610 // of the "holes" in the array.
611 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement)
612 ILE->setArrayFiller(ElementInit.getAs<Expr>());
614 ILE->setInit(Init, ElementInit.getAs<Expr>());
616 // For arrays, just set the expression used for value-initialization
617 // of the rest of elements and exit.
618 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) {
619 ILE->setArrayFiller(ElementInit.getAs<Expr>());
623 if (!isa<ImplicitValueInitExpr>(ElementInit.get())) {
624 // Empty initialization requires a constructor call, so
625 // extend the initializer list to include the constructor
626 // call and make a note that we'll need to take another pass
627 // through the initializer list.
628 ILE->updateInit(SemaRef.Context, Init, ElementInit.getAs<Expr>());
629 RequiresSecondPass = true;
632 } else if (InitListExpr *InnerILE
633 = dyn_cast_or_null<InitListExpr>(InitExpr))
634 FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass);
639 InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity,
640 InitListExpr *IL, QualType &T,
642 : SemaRef(S), VerifyOnly(VerifyOnly) {
645 FullyStructuredList =
646 getStructuredSubobjectInit(IL, 0, T, nullptr, 0, IL->getSourceRange());
647 CheckExplicitInitList(Entity, IL, T, FullyStructuredList,
648 /*TopLevelObject=*/true);
650 if (!hadError && !VerifyOnly) {
651 bool RequiresSecondPass = false;
652 FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass);
653 if (RequiresSecondPass && !hadError)
654 FillInEmptyInitializations(Entity, FullyStructuredList,
659 int InitListChecker::numArrayElements(QualType DeclType) {
660 // FIXME: use a proper constant
661 int maxElements = 0x7FFFFFFF;
662 if (const ConstantArrayType *CAT =
663 SemaRef.Context.getAsConstantArrayType(DeclType)) {
664 maxElements = static_cast<int>(CAT->getSize().getZExtValue());
669 int InitListChecker::numStructUnionElements(QualType DeclType) {
670 RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl();
671 int InitializableMembers = 0;
672 for (const auto *Field : structDecl->fields())
673 if (!Field->isUnnamedBitfield())
674 ++InitializableMembers;
676 if (structDecl->isUnion())
677 return std::min(InitializableMembers, 1);
678 return InitializableMembers - structDecl->hasFlexibleArrayMember();
681 /// Check whether the range of the initializer \p ParentIList from element
682 /// \p Index onwards can be used to initialize an object of type \p T. Update
683 /// \p Index to indicate how many elements of the list were consumed.
685 /// This also fills in \p StructuredList, from element \p StructuredIndex
686 /// onwards, with the fully-braced, desugared form of the initialization.
687 void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity,
688 InitListExpr *ParentIList,
689 QualType T, unsigned &Index,
690 InitListExpr *StructuredList,
691 unsigned &StructuredIndex) {
694 if (T->isArrayType())
695 maxElements = numArrayElements(T);
696 else if (T->isRecordType())
697 maxElements = numStructUnionElements(T);
698 else if (T->isVectorType())
699 maxElements = T->getAs<VectorType>()->getNumElements();
701 llvm_unreachable("CheckImplicitInitList(): Illegal type");
703 if (maxElements == 0) {
705 SemaRef.Diag(ParentIList->getInit(Index)->getLocStart(),
706 diag::err_implicit_empty_initializer);
712 // Build a structured initializer list corresponding to this subobject.
713 InitListExpr *StructuredSubobjectInitList
714 = getStructuredSubobjectInit(ParentIList, Index, T, StructuredList,
716 SourceRange(ParentIList->getInit(Index)->getLocStart(),
717 ParentIList->getSourceRange().getEnd()));
718 unsigned StructuredSubobjectInitIndex = 0;
720 // Check the element types and build the structural subobject.
721 unsigned StartIndex = Index;
722 CheckListElementTypes(Entity, ParentIList, T,
723 /*SubobjectIsDesignatorContext=*/false, Index,
724 StructuredSubobjectInitList,
725 StructuredSubobjectInitIndex);
728 StructuredSubobjectInitList->setType(T);
730 unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
731 // Update the structured sub-object initializer so that it's ending
732 // range corresponds with the end of the last initializer it used.
733 if (EndIndex < ParentIList->getNumInits()) {
734 SourceLocation EndLoc
735 = ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
736 StructuredSubobjectInitList->setRBraceLoc(EndLoc);
739 // Complain about missing braces.
740 if (T->isArrayType() || T->isRecordType()) {
741 SemaRef.Diag(StructuredSubobjectInitList->getLocStart(),
742 diag::warn_missing_braces)
743 << StructuredSubobjectInitList->getSourceRange()
744 << FixItHint::CreateInsertion(
745 StructuredSubobjectInitList->getLocStart(), "{")
746 << FixItHint::CreateInsertion(
747 SemaRef.getLocForEndOfToken(
748 StructuredSubobjectInitList->getLocEnd()),
754 /// Check whether the initializer \p IList (that was written with explicit
755 /// braces) can be used to initialize an object of type \p T.
757 /// This also fills in \p StructuredList with the fully-braced, desugared
758 /// form of the initialization.
759 void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity,
760 InitListExpr *IList, QualType &T,
761 InitListExpr *StructuredList,
762 bool TopLevelObject) {
764 SyntacticToSemantic[IList] = StructuredList;
765 StructuredList->setSyntacticForm(IList);
768 unsigned Index = 0, StructuredIndex = 0;
769 CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true,
770 Index, StructuredList, StructuredIndex, TopLevelObject);
773 if (!ExprTy->isArrayType())
774 ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context);
775 IList->setType(ExprTy);
776 StructuredList->setType(ExprTy);
781 if (Index < IList->getNumInits()) {
782 // We have leftover initializers
784 if (SemaRef.getLangOpts().CPlusPlus ||
785 (SemaRef.getLangOpts().OpenCL &&
786 IList->getType()->isVectorType())) {
792 if (StructuredIndex == 1 &&
793 IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) ==
795 unsigned DK = diag::ext_excess_initializers_in_char_array_initializer;
796 if (SemaRef.getLangOpts().CPlusPlus) {
797 DK = diag::err_excess_initializers_in_char_array_initializer;
801 SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK)
802 << IList->getInit(Index)->getSourceRange();
803 } else if (!T->isIncompleteType()) {
804 // Don't complain for incomplete types, since we'll get an error
806 QualType CurrentObjectType = StructuredList->getType();
808 CurrentObjectType->isArrayType()? 0 :
809 CurrentObjectType->isVectorType()? 1 :
810 CurrentObjectType->isScalarType()? 2 :
811 CurrentObjectType->isUnionType()? 3 :
814 unsigned DK = diag::ext_excess_initializers;
815 if (SemaRef.getLangOpts().CPlusPlus) {
816 DK = diag::err_excess_initializers;
819 if (SemaRef.getLangOpts().OpenCL && initKind == 1) {
820 DK = diag::err_excess_initializers;
824 SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK)
825 << initKind << IList->getInit(Index)->getSourceRange();
829 if (!VerifyOnly && T->isScalarType() && IList->getNumInits() == 1 &&
831 SemaRef.Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init)
832 << IList->getSourceRange()
833 << FixItHint::CreateRemoval(IList->getLocStart())
834 << FixItHint::CreateRemoval(IList->getLocEnd());
837 void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity,
840 bool SubobjectIsDesignatorContext,
842 InitListExpr *StructuredList,
843 unsigned &StructuredIndex,
844 bool TopLevelObject) {
845 if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) {
846 // Explicitly braced initializer for complex type can be real+imaginary
848 CheckComplexType(Entity, IList, DeclType, Index,
849 StructuredList, StructuredIndex);
850 } else if (DeclType->isScalarType()) {
851 CheckScalarType(Entity, IList, DeclType, Index,
852 StructuredList, StructuredIndex);
853 } else if (DeclType->isVectorType()) {
854 CheckVectorType(Entity, IList, DeclType, Index,
855 StructuredList, StructuredIndex);
856 } else if (DeclType->isRecordType()) {
857 assert(DeclType->isAggregateType() &&
858 "non-aggregate records should be handed in CheckSubElementType");
859 RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
860 CheckStructUnionTypes(Entity, IList, DeclType, RD->field_begin(),
861 SubobjectIsDesignatorContext, Index,
862 StructuredList, StructuredIndex,
864 } else if (DeclType->isArrayType()) {
866 SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
868 CheckArrayType(Entity, IList, DeclType, Zero,
869 SubobjectIsDesignatorContext, Index,
870 StructuredList, StructuredIndex);
871 } else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
872 // This type is invalid, issue a diagnostic.
875 SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type)
878 } else if (DeclType->isReferenceType()) {
879 CheckReferenceType(Entity, IList, DeclType, Index,
880 StructuredList, StructuredIndex);
881 } else if (DeclType->isObjCObjectType()) {
883 SemaRef.Diag(IList->getLocStart(), diag::err_init_objc_class)
888 SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type)
894 void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
898 InitListExpr *StructuredList,
899 unsigned &StructuredIndex) {
900 Expr *expr = IList->getInit(Index);
902 if (ElemType->isReferenceType())
903 return CheckReferenceType(Entity, IList, ElemType, Index,
904 StructuredList, StructuredIndex);
906 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
907 if (!ElemType->isRecordType() || ElemType->isAggregateType()) {
908 InitListExpr *InnerStructuredList
909 = getStructuredSubobjectInit(IList, Index, ElemType,
910 StructuredList, StructuredIndex,
911 SubInitList->getSourceRange());
912 CheckExplicitInitList(Entity, SubInitList, ElemType,
913 InnerStructuredList);
918 assert(SemaRef.getLangOpts().CPlusPlus &&
919 "non-aggregate records are only possible in C++");
920 // C++ initialization is handled later.
921 } else if (isa<ImplicitValueInitExpr>(expr)) {
922 // This happens during template instantiation when we see an InitListExpr
923 // that we've already checked once.
924 assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&
925 "found implicit initialization for the wrong type");
927 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
932 // FIXME: Need to handle atomic aggregate types with implicit init lists.
933 if (ElemType->isScalarType() || ElemType->isAtomicType())
934 return CheckScalarType(Entity, IList, ElemType, Index,
935 StructuredList, StructuredIndex);
937 assert((ElemType->isRecordType() || ElemType->isVectorType() ||
938 ElemType->isArrayType()) && "Unexpected type");
940 if (const ArrayType *arrayType = SemaRef.Context.getAsArrayType(ElemType)) {
941 // arrayType can be incomplete if we're initializing a flexible
942 // array member. There's nothing we can do with the completed
943 // type here, though.
945 if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) {
947 CheckStringInit(expr, ElemType, arrayType, SemaRef);
948 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
954 // Fall through for subaggregate initialization.
956 } else if (SemaRef.getLangOpts().CPlusPlus) {
957 // C++ [dcl.init.aggr]p12:
958 // All implicit type conversions (clause 4) are considered when
959 // initializing the aggregate member with an initializer from
960 // an initializer-list. If the initializer can initialize a
961 // member, the member is initialized. [...]
963 // FIXME: Better EqualLoc?
964 InitializationKind Kind =
965 InitializationKind::CreateCopy(expr->getLocStart(), SourceLocation());
966 InitializationSequence Seq(SemaRef, Entity, Kind, expr);
971 Seq.Perform(SemaRef, Entity, Kind, expr);
972 if (Result.isInvalid())
975 UpdateStructuredListElement(StructuredList, StructuredIndex,
976 Result.getAs<Expr>());
982 // Fall through for subaggregate initialization
986 // The initializer for a structure or union object that has
987 // automatic storage duration shall be either an initializer
988 // list as described below, or a single expression that has
989 // compatible structure or union type. In the latter case, the
990 // initial value of the object, including unnamed members, is
991 // that of the expression.
992 ExprResult ExprRes = expr;
993 if ((ElemType->isRecordType() || ElemType->isVectorType()) &&
994 SemaRef.CheckSingleAssignmentConstraints(ElemType, ExprRes,
996 != Sema::Incompatible) {
997 if (ExprRes.isInvalid())
1000 ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get());
1001 if (ExprRes.isInvalid())
1004 UpdateStructuredListElement(StructuredList, StructuredIndex,
1005 ExprRes.getAs<Expr>());
1010 // Fall through for subaggregate initialization
1013 // C++ [dcl.init.aggr]p12:
1015 // [...] Otherwise, if the member is itself a non-empty
1016 // subaggregate, brace elision is assumed and the initializer is
1017 // considered for the initialization of the first member of
1018 // the subaggregate.
1019 if (!SemaRef.getLangOpts().OpenCL &&
1020 (ElemType->isAggregateType() || ElemType->isVectorType())) {
1021 CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList,
1026 // We cannot initialize this element, so let
1027 // PerformCopyInitialization produce the appropriate diagnostic.
1028 SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr,
1029 /*TopLevelOfInitList=*/true);
1037 void InitListChecker::CheckComplexType(const InitializedEntity &Entity,
1038 InitListExpr *IList, QualType DeclType,
1040 InitListExpr *StructuredList,
1041 unsigned &StructuredIndex) {
1042 assert(Index == 0 && "Index in explicit init list must be zero");
1044 // As an extension, clang supports complex initializers, which initialize
1045 // a complex number component-wise. When an explicit initializer list for
1046 // a complex number contains two two initializers, this extension kicks in:
1047 // it exepcts the initializer list to contain two elements convertible to
1048 // the element type of the complex type. The first element initializes
1049 // the real part, and the second element intitializes the imaginary part.
1051 if (IList->getNumInits() != 2)
1052 return CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1055 // This is an extension in C. (The builtin _Complex type does not exist
1056 // in the C++ standard.)
1057 if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly)
1058 SemaRef.Diag(IList->getLocStart(), diag::ext_complex_component_init)
1059 << IList->getSourceRange();
1061 // Initialize the complex number.
1062 QualType elementType = DeclType->getAs<ComplexType>()->getElementType();
1063 InitializedEntity ElementEntity =
1064 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1066 for (unsigned i = 0; i < 2; ++i) {
1067 ElementEntity.setElementIndex(Index);
1068 CheckSubElementType(ElementEntity, IList, elementType, Index,
1069 StructuredList, StructuredIndex);
1074 void InitListChecker::CheckScalarType(const InitializedEntity &Entity,
1075 InitListExpr *IList, QualType DeclType,
1077 InitListExpr *StructuredList,
1078 unsigned &StructuredIndex) {
1079 if (Index >= IList->getNumInits()) {
1081 SemaRef.Diag(IList->getLocStart(),
1082 SemaRef.getLangOpts().CPlusPlus11 ?
1083 diag::warn_cxx98_compat_empty_scalar_initializer :
1084 diag::err_empty_scalar_initializer)
1085 << IList->getSourceRange();
1086 hadError = !SemaRef.getLangOpts().CPlusPlus11;
1092 Expr *expr = IList->getInit(Index);
1093 if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) {
1094 // FIXME: This is invalid, and accepting it causes overload resolution
1095 // to pick the wrong overload in some corner cases.
1097 SemaRef.Diag(SubIList->getLocStart(),
1098 diag::ext_many_braces_around_scalar_init)
1099 << SubIList->getSourceRange();
1101 CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList,
1104 } else if (isa<DesignatedInitExpr>(expr)) {
1106 SemaRef.Diag(expr->getLocStart(),
1107 diag::err_designator_for_scalar_init)
1108 << DeclType << expr->getSourceRange();
1116 if (!SemaRef.CanPerformCopyInitialization(Entity,expr))
1123 SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), expr,
1124 /*TopLevelOfInitList=*/true);
1126 Expr *ResultExpr = nullptr;
1128 if (Result.isInvalid())
1129 hadError = true; // types weren't compatible.
1131 ResultExpr = Result.getAs<Expr>();
1133 if (ResultExpr != expr) {
1134 // The type was promoted, update initializer list.
1135 IList->setInit(Index, ResultExpr);
1141 UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
1145 void InitListChecker::CheckReferenceType(const InitializedEntity &Entity,
1146 InitListExpr *IList, QualType DeclType,
1148 InitListExpr *StructuredList,
1149 unsigned &StructuredIndex) {
1150 if (Index >= IList->getNumInits()) {
1151 // FIXME: It would be wonderful if we could point at the actual member. In
1152 // general, it would be useful to pass location information down the stack,
1153 // so that we know the location (or decl) of the "current object" being
1156 SemaRef.Diag(IList->getLocStart(),
1157 diag::err_init_reference_member_uninitialized)
1159 << IList->getSourceRange();
1166 Expr *expr = IList->getInit(Index);
1167 if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) {
1169 SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list)
1170 << DeclType << IList->getSourceRange();
1178 if (!SemaRef.CanPerformCopyInitialization(Entity,expr))
1185 SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), expr,
1186 /*TopLevelOfInitList=*/true);
1188 if (Result.isInvalid())
1191 expr = Result.getAs<Expr>();
1192 IList->setInit(Index, expr);
1197 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1201 void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
1202 InitListExpr *IList, QualType DeclType,
1204 InitListExpr *StructuredList,
1205 unsigned &StructuredIndex) {
1206 const VectorType *VT = DeclType->getAs<VectorType>();
1207 unsigned maxElements = VT->getNumElements();
1208 unsigned numEltsInit = 0;
1209 QualType elementType = VT->getElementType();
1211 if (Index >= IList->getNumInits()) {
1212 // Make sure the element type can be value-initialized.
1214 CheckEmptyInitializable(
1215 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1216 IList->getLocEnd());
1220 if (!SemaRef.getLangOpts().OpenCL) {
1221 // If the initializing element is a vector, try to copy-initialize
1222 // instead of breaking it apart (which is doomed to failure anyway).
1223 Expr *Init = IList->getInit(Index);
1224 if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) {
1226 if (!SemaRef.CanPerformCopyInitialization(Entity, Init))
1233 SemaRef.PerformCopyInitialization(Entity, Init->getLocStart(), Init,
1234 /*TopLevelOfInitList=*/true);
1236 Expr *ResultExpr = nullptr;
1237 if (Result.isInvalid())
1238 hadError = true; // types weren't compatible.
1240 ResultExpr = Result.getAs<Expr>();
1242 if (ResultExpr != Init) {
1243 // The type was promoted, update initializer list.
1244 IList->setInit(Index, ResultExpr);
1250 UpdateStructuredListElement(StructuredList, StructuredIndex,
1256 InitializedEntity ElementEntity =
1257 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1259 for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) {
1260 // Don't attempt to go past the end of the init list
1261 if (Index >= IList->getNumInits()) {
1263 CheckEmptyInitializable(ElementEntity, IList->getLocEnd());
1267 ElementEntity.setElementIndex(Index);
1268 CheckSubElementType(ElementEntity, IList, elementType, Index,
1269 StructuredList, StructuredIndex);
1275 bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian();
1276 const VectorType *T = Entity.getType()->getAs<VectorType>();
1277 if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector ||
1278 T->getVectorKind() == VectorType::NeonPolyVector)) {
1279 // The ability to use vector initializer lists is a GNU vector extension
1280 // and is unrelated to the NEON intrinsics in arm_neon.h. On little
1281 // endian machines it works fine, however on big endian machines it
1282 // exhibits surprising behaviour:
1284 // uint32x2_t x = {42, 64};
1285 // return vget_lane_u32(x, 0); // Will return 64.
1287 // Because of this, explicitly call out that it is non-portable.
1289 SemaRef.Diag(IList->getLocStart(),
1290 diag::warn_neon_vector_initializer_non_portable);
1292 const char *typeCode;
1293 unsigned typeSize = SemaRef.Context.getTypeSize(elementType);
1295 if (elementType->isFloatingType())
1297 else if (elementType->isSignedIntegerType())
1299 else if (elementType->isUnsignedIntegerType())
1302 llvm_unreachable("Invalid element type!");
1304 SemaRef.Diag(IList->getLocStart(),
1305 SemaRef.Context.getTypeSize(VT) > 64 ?
1306 diag::note_neon_vector_initializer_non_portable_q :
1307 diag::note_neon_vector_initializer_non_portable)
1308 << typeCode << typeSize;
1314 InitializedEntity ElementEntity =
1315 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1317 // OpenCL initializers allows vectors to be constructed from vectors.
1318 for (unsigned i = 0; i < maxElements; ++i) {
1319 // Don't attempt to go past the end of the init list
1320 if (Index >= IList->getNumInits())
1323 ElementEntity.setElementIndex(Index);
1325 QualType IType = IList->getInit(Index)->getType();
1326 if (!IType->isVectorType()) {
1327 CheckSubElementType(ElementEntity, IList, elementType, Index,
1328 StructuredList, StructuredIndex);
1332 const VectorType *IVT = IType->getAs<VectorType>();
1333 unsigned numIElts = IVT->getNumElements();
1335 if (IType->isExtVectorType())
1336 VecType = SemaRef.Context.getExtVectorType(elementType, numIElts);
1338 VecType = SemaRef.Context.getVectorType(elementType, numIElts,
1339 IVT->getVectorKind());
1340 CheckSubElementType(ElementEntity, IList, VecType, Index,
1341 StructuredList, StructuredIndex);
1342 numEltsInit += numIElts;
1346 // OpenCL requires all elements to be initialized.
1347 if (numEltsInit != maxElements) {
1349 SemaRef.Diag(IList->getLocStart(),
1350 diag::err_vector_incorrect_num_initializers)
1351 << (numEltsInit < maxElements) << maxElements << numEltsInit;
1356 void InitListChecker::CheckArrayType(const InitializedEntity &Entity,
1357 InitListExpr *IList, QualType &DeclType,
1358 llvm::APSInt elementIndex,
1359 bool SubobjectIsDesignatorContext,
1361 InitListExpr *StructuredList,
1362 unsigned &StructuredIndex) {
1363 const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType);
1365 // Check for the special-case of initializing an array with a string.
1366 if (Index < IList->getNumInits()) {
1367 if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) ==
1369 // We place the string literal directly into the resulting
1370 // initializer list. This is the only place where the structure
1371 // of the structured initializer list doesn't match exactly,
1372 // because doing so would involve allocating one character
1373 // constant for each string.
1375 CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef);
1376 UpdateStructuredListElement(StructuredList, StructuredIndex,
1377 IList->getInit(Index));
1378 StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
1384 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) {
1385 // Check for VLAs; in standard C it would be possible to check this
1386 // earlier, but I don't know where clang accepts VLAs (gcc accepts
1387 // them in all sorts of strange places).
1389 SemaRef.Diag(VAT->getSizeExpr()->getLocStart(),
1390 diag::err_variable_object_no_init)
1391 << VAT->getSizeExpr()->getSourceRange();
1398 // We might know the maximum number of elements in advance.
1399 llvm::APSInt maxElements(elementIndex.getBitWidth(),
1400 elementIndex.isUnsigned());
1401 bool maxElementsKnown = false;
1402 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) {
1403 maxElements = CAT->getSize();
1404 elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth());
1405 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1406 maxElementsKnown = true;
1409 QualType elementType = arrayType->getElementType();
1410 while (Index < IList->getNumInits()) {
1411 Expr *Init = IList->getInit(Index);
1412 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
1413 // If we're not the subobject that matches up with the '{' for
1414 // the designator, we shouldn't be handling the
1415 // designator. Return immediately.
1416 if (!SubobjectIsDesignatorContext)
1419 // Handle this designated initializer. elementIndex will be
1420 // updated to be the next array element we'll initialize.
1421 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
1422 DeclType, nullptr, &elementIndex, Index,
1423 StructuredList, StructuredIndex, true,
1429 if (elementIndex.getBitWidth() > maxElements.getBitWidth())
1430 maxElements = maxElements.extend(elementIndex.getBitWidth());
1431 else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
1432 elementIndex = elementIndex.extend(maxElements.getBitWidth());
1433 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1435 // If the array is of incomplete type, keep track of the number of
1436 // elements in the initializer.
1437 if (!maxElementsKnown && elementIndex > maxElements)
1438 maxElements = elementIndex;
1443 // If we know the maximum number of elements, and we've already
1444 // hit it, stop consuming elements in the initializer list.
1445 if (maxElementsKnown && elementIndex == maxElements)
1448 InitializedEntity ElementEntity =
1449 InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex,
1451 // Check this element.
1452 CheckSubElementType(ElementEntity, IList, elementType, Index,
1453 StructuredList, StructuredIndex);
1456 // If the array is of incomplete type, keep track of the number of
1457 // elements in the initializer.
1458 if (!maxElementsKnown && elementIndex > maxElements)
1459 maxElements = elementIndex;
1461 if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) {
1462 // If this is an incomplete array type, the actual type needs to
1463 // be calculated here.
1464 llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
1465 if (maxElements == Zero) {
1466 // Sizing an array implicitly to zero is not allowed by ISO C,
1467 // but is supported by GNU.
1468 SemaRef.Diag(IList->getLocStart(),
1469 diag::ext_typecheck_zero_array_size);
1472 DeclType = SemaRef.Context.getConstantArrayType(elementType, maxElements,
1473 ArrayType::Normal, 0);
1475 if (!hadError && VerifyOnly) {
1476 // Check if there are any members of the array that get value-initialized.
1477 // If so, check if doing that is possible.
1478 // FIXME: This needs to detect holes left by designated initializers too.
1479 if (maxElementsKnown && elementIndex < maxElements)
1480 CheckEmptyInitializable(InitializedEntity::InitializeElement(
1481 SemaRef.Context, 0, Entity),
1482 IList->getLocEnd());
1486 bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity,
1489 bool TopLevelObject) {
1490 // Handle GNU flexible array initializers.
1491 unsigned FlexArrayDiag;
1492 if (isa<InitListExpr>(InitExpr) &&
1493 cast<InitListExpr>(InitExpr)->getNumInits() == 0) {
1494 // Empty flexible array init always allowed as an extension
1495 FlexArrayDiag = diag::ext_flexible_array_init;
1496 } else if (SemaRef.getLangOpts().CPlusPlus) {
1497 // Disallow flexible array init in C++; it is not required for gcc
1498 // compatibility, and it needs work to IRGen correctly in general.
1499 FlexArrayDiag = diag::err_flexible_array_init;
1500 } else if (!TopLevelObject) {
1501 // Disallow flexible array init on non-top-level object
1502 FlexArrayDiag = diag::err_flexible_array_init;
1503 } else if (Entity.getKind() != InitializedEntity::EK_Variable) {
1504 // Disallow flexible array init on anything which is not a variable.
1505 FlexArrayDiag = diag::err_flexible_array_init;
1506 } else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) {
1507 // Disallow flexible array init on local variables.
1508 FlexArrayDiag = diag::err_flexible_array_init;
1510 // Allow other cases.
1511 FlexArrayDiag = diag::ext_flexible_array_init;
1515 SemaRef.Diag(InitExpr->getLocStart(),
1517 << InitExpr->getLocStart();
1518 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
1522 return FlexArrayDiag != diag::ext_flexible_array_init;
1525 void InitListChecker::CheckStructUnionTypes(const InitializedEntity &Entity,
1526 InitListExpr *IList,
1528 RecordDecl::field_iterator Field,
1529 bool SubobjectIsDesignatorContext,
1531 InitListExpr *StructuredList,
1532 unsigned &StructuredIndex,
1533 bool TopLevelObject) {
1534 RecordDecl* structDecl = DeclType->getAs<RecordType>()->getDecl();
1536 // If the record is invalid, some of it's members are invalid. To avoid
1537 // confusion, we forgo checking the intializer for the entire record.
1538 if (structDecl->isInvalidDecl()) {
1539 // Assume it was supposed to consume a single initializer.
1545 if (DeclType->isUnionType() && IList->getNumInits() == 0) {
1546 RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
1548 // If there's a default initializer, use it.
1549 if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->hasInClassInitializer()) {
1552 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
1553 Field != FieldEnd; ++Field) {
1554 if (Field->hasInClassInitializer()) {
1555 StructuredList->setInitializedFieldInUnion(*Field);
1556 // FIXME: Actually build a CXXDefaultInitExpr?
1562 // Value-initialize the first member of the union that isn't an unnamed
1564 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
1565 Field != FieldEnd; ++Field) {
1566 if (!Field->isUnnamedBitfield()) {
1568 CheckEmptyInitializable(
1569 InitializedEntity::InitializeMember(*Field, &Entity),
1570 IList->getLocEnd());
1572 StructuredList->setInitializedFieldInUnion(*Field);
1579 // If structDecl is a forward declaration, this loop won't do
1580 // anything except look at designated initializers; That's okay,
1581 // because an error should get printed out elsewhere. It might be
1582 // worthwhile to skip over the rest of the initializer, though.
1583 RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
1584 RecordDecl::field_iterator FieldEnd = RD->field_end();
1585 bool InitializedSomething = false;
1586 bool CheckForMissingFields = true;
1587 while (Index < IList->getNumInits()) {
1588 Expr *Init = IList->getInit(Index);
1590 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
1591 // If we're not the subobject that matches up with the '{' for
1592 // the designator, we shouldn't be handling the
1593 // designator. Return immediately.
1594 if (!SubobjectIsDesignatorContext)
1597 // Handle this designated initializer. Field will be updated to
1598 // the next field that we'll be initializing.
1599 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
1600 DeclType, &Field, nullptr, Index,
1601 StructuredList, StructuredIndex,
1602 true, TopLevelObject))
1605 InitializedSomething = true;
1607 // Disable check for missing fields when designators are used.
1608 // This matches gcc behaviour.
1609 CheckForMissingFields = false;
1613 if (Field == FieldEnd) {
1614 // We've run out of fields. We're done.
1618 // We've already initialized a member of a union. We're done.
1619 if (InitializedSomething && DeclType->isUnionType())
1622 // If we've hit the flexible array member at the end, we're done.
1623 if (Field->getType()->isIncompleteArrayType())
1626 if (Field->isUnnamedBitfield()) {
1627 // Don't initialize unnamed bitfields, e.g. "int : 20;"
1632 // Make sure we can use this declaration.
1635 InvalidUse = !SemaRef.CanUseDecl(*Field);
1637 InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field,
1638 IList->getInit(Index)->getLocStart());
1646 InitializedEntity MemberEntity =
1647 InitializedEntity::InitializeMember(*Field, &Entity);
1648 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
1649 StructuredList, StructuredIndex);
1650 InitializedSomething = true;
1652 if (DeclType->isUnionType() && !VerifyOnly) {
1653 // Initialize the first field within the union.
1654 StructuredList->setInitializedFieldInUnion(*Field);
1660 // Emit warnings for missing struct field initializers.
1661 if (!VerifyOnly && InitializedSomething && CheckForMissingFields &&
1662 Field != FieldEnd && !Field->getType()->isIncompleteArrayType() &&
1663 !DeclType->isUnionType()) {
1664 // It is possible we have one or more unnamed bitfields remaining.
1665 // Find first (if any) named field and emit warning.
1666 for (RecordDecl::field_iterator it = Field, end = RD->field_end();
1668 if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) {
1669 SemaRef.Diag(IList->getSourceRange().getEnd(),
1670 diag::warn_missing_field_initializers) << *it;
1676 // Check that any remaining fields can be value-initialized.
1677 if (VerifyOnly && Field != FieldEnd && !DeclType->isUnionType() &&
1678 !Field->getType()->isIncompleteArrayType()) {
1679 // FIXME: Should check for holes left by designated initializers too.
1680 for (; Field != FieldEnd && !hadError; ++Field) {
1681 if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer())
1682 CheckEmptyInitializable(
1683 InitializedEntity::InitializeMember(*Field, &Entity),
1684 IList->getLocEnd());
1688 if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
1689 Index >= IList->getNumInits())
1692 if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field,
1699 InitializedEntity MemberEntity =
1700 InitializedEntity::InitializeMember(*Field, &Entity);
1702 if (isa<InitListExpr>(IList->getInit(Index)))
1703 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
1704 StructuredList, StructuredIndex);
1706 CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index,
1707 StructuredList, StructuredIndex);
1710 /// \brief Expand a field designator that refers to a member of an
1711 /// anonymous struct or union into a series of field designators that
1712 /// refers to the field within the appropriate subobject.
1714 static void ExpandAnonymousFieldDesignator(Sema &SemaRef,
1715 DesignatedInitExpr *DIE,
1717 IndirectFieldDecl *IndirectField) {
1718 typedef DesignatedInitExpr::Designator Designator;
1720 // Build the replacement designators.
1721 SmallVector<Designator, 4> Replacements;
1722 for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(),
1723 PE = IndirectField->chain_end(); PI != PE; ++PI) {
1725 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
1726 DIE->getDesignator(DesigIdx)->getDotLoc(),
1727 DIE->getDesignator(DesigIdx)->getFieldLoc()));
1729 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
1730 SourceLocation(), SourceLocation()));
1731 assert(isa<FieldDecl>(*PI));
1732 Replacements.back().setField(cast<FieldDecl>(*PI));
1735 // Expand the current designator into the set of replacement
1736 // designators, so we have a full subobject path down to where the
1737 // member of the anonymous struct/union is actually stored.
1738 DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0],
1739 &Replacements[0] + Replacements.size());
1742 static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
1743 DesignatedInitExpr *DIE) {
1744 unsigned NumIndexExprs = DIE->getNumSubExprs() - 1;
1745 SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
1746 for (unsigned I = 0; I < NumIndexExprs; ++I)
1747 IndexExprs[I] = DIE->getSubExpr(I + 1);
1748 return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators_begin(),
1749 DIE->size(), IndexExprs,
1750 DIE->getEqualOrColonLoc(),
1751 DIE->usesGNUSyntax(), DIE->getInit());
1756 // Callback to only accept typo corrections that are for field members of
1757 // the given struct or union.
1758 class FieldInitializerValidatorCCC : public CorrectionCandidateCallback {
1760 explicit FieldInitializerValidatorCCC(RecordDecl *RD)
1763 bool ValidateCandidate(const TypoCorrection &candidate) override {
1764 FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>();
1765 return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record);
1774 /// @brief Check the well-formedness of a C99 designated initializer.
1776 /// Determines whether the designated initializer @p DIE, which
1777 /// resides at the given @p Index within the initializer list @p
1778 /// IList, is well-formed for a current object of type @p DeclType
1779 /// (C99 6.7.8). The actual subobject that this designator refers to
1780 /// within the current subobject is returned in either
1781 /// @p NextField or @p NextElementIndex (whichever is appropriate).
1783 /// @param IList The initializer list in which this designated
1784 /// initializer occurs.
1786 /// @param DIE The designated initializer expression.
1788 /// @param DesigIdx The index of the current designator.
1790 /// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17),
1791 /// into which the designation in @p DIE should refer.
1793 /// @param NextField If non-NULL and the first designator in @p DIE is
1794 /// a field, this will be set to the field declaration corresponding
1795 /// to the field named by the designator.
1797 /// @param NextElementIndex If non-NULL and the first designator in @p
1798 /// DIE is an array designator or GNU array-range designator, this
1799 /// will be set to the last index initialized by this designator.
1801 /// @param Index Index into @p IList where the designated initializer
1804 /// @param StructuredList The initializer list expression that
1805 /// describes all of the subobject initializers in the order they'll
1806 /// actually be initialized.
1808 /// @returns true if there was an error, false otherwise.
1810 InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity,
1811 InitListExpr *IList,
1812 DesignatedInitExpr *DIE,
1814 QualType &CurrentObjectType,
1815 RecordDecl::field_iterator *NextField,
1816 llvm::APSInt *NextElementIndex,
1818 InitListExpr *StructuredList,
1819 unsigned &StructuredIndex,
1820 bool FinishSubobjectInit,
1821 bool TopLevelObject) {
1822 if (DesigIdx == DIE->size()) {
1823 // Check the actual initialization for the designated object type.
1824 bool prevHadError = hadError;
1826 // Temporarily remove the designator expression from the
1827 // initializer list that the child calls see, so that we don't try
1828 // to re-process the designator.
1829 unsigned OldIndex = Index;
1830 IList->setInit(OldIndex, DIE->getInit());
1832 CheckSubElementType(Entity, IList, CurrentObjectType, Index,
1833 StructuredList, StructuredIndex);
1835 // Restore the designated initializer expression in the syntactic
1836 // form of the initializer list.
1837 if (IList->getInit(OldIndex) != DIE->getInit())
1838 DIE->setInit(IList->getInit(OldIndex));
1839 IList->setInit(OldIndex, DIE);
1841 return hadError && !prevHadError;
1844 DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx);
1845 bool IsFirstDesignator = (DesigIdx == 0);
1847 assert((IsFirstDesignator || StructuredList) &&
1848 "Need a non-designated initializer list to start from");
1850 // Determine the structural initializer list that corresponds to the
1851 // current subobject.
1852 StructuredList = IsFirstDesignator? SyntacticToSemantic.lookup(IList)
1853 : getStructuredSubobjectInit(IList, Index, CurrentObjectType,
1854 StructuredList, StructuredIndex,
1855 SourceRange(D->getLocStart(),
1857 assert(StructuredList && "Expected a structured initializer list");
1860 if (D->isFieldDesignator()) {
1863 // If a designator has the form
1867 // then the current object (defined below) shall have
1868 // structure or union type and the identifier shall be the
1869 // name of a member of that type.
1870 const RecordType *RT = CurrentObjectType->getAs<RecordType>();
1872 SourceLocation Loc = D->getDotLoc();
1873 if (Loc.isInvalid())
1874 Loc = D->getFieldLoc();
1876 SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
1877 << SemaRef.getLangOpts().CPlusPlus << CurrentObjectType;
1882 FieldDecl *KnownField = D->getField();
1884 IdentifierInfo *FieldName = D->getFieldName();
1885 DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
1886 for (NamedDecl *ND : Lookup) {
1887 if (auto *FD = dyn_cast<FieldDecl>(ND)) {
1891 if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) {
1892 // In verify mode, don't modify the original.
1894 DIE = CloneDesignatedInitExpr(SemaRef, DIE);
1895 ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD);
1896 D = DIE->getDesignator(DesigIdx);
1897 KnownField = cast<FieldDecl>(*IFD->chain_begin());
1904 return true; // No typo correction when just trying this out.
1907 // Name lookup found something, but it wasn't a field.
1908 if (!Lookup.empty()) {
1909 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
1911 SemaRef.Diag(Lookup.front()->getLocation(),
1912 diag::note_field_designator_found);
1917 // Name lookup didn't find anything.
1918 // Determine whether this was a typo for another field name.
1919 if (TypoCorrection Corrected = SemaRef.CorrectTypo(
1920 DeclarationNameInfo(FieldName, D->getFieldLoc()),
1921 Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr,
1922 llvm::make_unique<FieldInitializerValidatorCCC>(RT->getDecl()),
1923 Sema::CTK_ErrorRecovery, RT->getDecl())) {
1924 SemaRef.diagnoseTypo(
1926 SemaRef.PDiag(diag::err_field_designator_unknown_suggest)
1927 << FieldName << CurrentObjectType);
1928 KnownField = Corrected.getCorrectionDeclAs<FieldDecl>();
1931 // Typo correction didn't find anything.
1932 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
1933 << FieldName << CurrentObjectType;
1940 unsigned FieldIndex = 0;
1941 for (auto *FI : RT->getDecl()->fields()) {
1942 if (FI->isUnnamedBitfield())
1944 if (KnownField == FI)
1949 RecordDecl::field_iterator Field =
1950 RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField));
1952 // All of the fields of a union are located at the same place in
1953 // the initializer list.
1954 if (RT->getDecl()->isUnion()) {
1957 FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion();
1958 if (CurrentField && CurrentField != *Field) {
1959 assert(StructuredList->getNumInits() == 1
1960 && "A union should never have more than one initializer!");
1962 // we're about to throw away an initializer, emit warning
1963 SemaRef.Diag(D->getFieldLoc(),
1964 diag::warn_initializer_overrides)
1965 << D->getSourceRange();
1966 Expr *ExistingInit = StructuredList->getInit(0);
1967 SemaRef.Diag(ExistingInit->getLocStart(),
1968 diag::note_previous_initializer)
1969 << /*FIXME:has side effects=*/0
1970 << ExistingInit->getSourceRange();
1972 // remove existing initializer
1973 StructuredList->resizeInits(SemaRef.Context, 0);
1974 StructuredList->setInitializedFieldInUnion(nullptr);
1977 StructuredList->setInitializedFieldInUnion(*Field);
1981 // Make sure we can use this declaration.
1984 InvalidUse = !SemaRef.CanUseDecl(*Field);
1986 InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc());
1993 // Update the designator with the field declaration.
1994 D->setField(*Field);
1996 // Make sure that our non-designated initializer list has space
1997 // for a subobject corresponding to this field.
1998 if (FieldIndex >= StructuredList->getNumInits())
1999 StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
2002 // This designator names a flexible array member.
2003 if (Field->getType()->isIncompleteArrayType()) {
2004 bool Invalid = false;
2005 if ((DesigIdx + 1) != DIE->size()) {
2006 // We can't designate an object within the flexible array
2007 // member (because GCC doesn't allow it).
2009 DesignatedInitExpr::Designator *NextD
2010 = DIE->getDesignator(DesigIdx + 1);
2011 SemaRef.Diag(NextD->getLocStart(),
2012 diag::err_designator_into_flexible_array_member)
2013 << SourceRange(NextD->getLocStart(),
2015 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2021 if (!hadError && !isa<InitListExpr>(DIE->getInit()) &&
2022 !isa<StringLiteral>(DIE->getInit())) {
2023 // The initializer is not an initializer list.
2025 SemaRef.Diag(DIE->getInit()->getLocStart(),
2026 diag::err_flexible_array_init_needs_braces)
2027 << DIE->getInit()->getSourceRange();
2028 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2034 // Check GNU flexible array initializer.
2035 if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field,
2044 // Initialize the array.
2045 bool prevHadError = hadError;
2046 unsigned newStructuredIndex = FieldIndex;
2047 unsigned OldIndex = Index;
2048 IList->setInit(Index, DIE->getInit());
2050 InitializedEntity MemberEntity =
2051 InitializedEntity::InitializeMember(*Field, &Entity);
2052 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2053 StructuredList, newStructuredIndex);
2055 IList->setInit(OldIndex, DIE);
2056 if (hadError && !prevHadError) {
2061 StructuredIndex = FieldIndex;
2065 // Recurse to check later designated subobjects.
2066 QualType FieldType = Field->getType();
2067 unsigned newStructuredIndex = FieldIndex;
2069 InitializedEntity MemberEntity =
2070 InitializedEntity::InitializeMember(*Field, &Entity);
2071 if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1,
2072 FieldType, nullptr, nullptr, Index,
2073 StructuredList, newStructuredIndex,
2078 // Find the position of the next field to be initialized in this
2083 // If this the first designator, our caller will continue checking
2084 // the rest of this struct/class/union subobject.
2085 if (IsFirstDesignator) {
2088 StructuredIndex = FieldIndex;
2092 if (!FinishSubobjectInit)
2095 // We've already initialized something in the union; we're done.
2096 if (RT->getDecl()->isUnion())
2099 // Check the remaining fields within this class/struct/union subobject.
2100 bool prevHadError = hadError;
2102 CheckStructUnionTypes(Entity, IList, CurrentObjectType, Field, false, Index,
2103 StructuredList, FieldIndex);
2104 return hadError && !prevHadError;
2109 // If a designator has the form
2111 // [ constant-expression ]
2113 // then the current object (defined below) shall have array
2114 // type and the expression shall be an integer constant
2115 // expression. If the array is of unknown size, any
2116 // nonnegative value is valid.
2118 // Additionally, cope with the GNU extension that permits
2119 // designators of the form
2121 // [ constant-expression ... constant-expression ]
2122 const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
2125 SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
2126 << CurrentObjectType;
2131 Expr *IndexExpr = nullptr;
2132 llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
2133 if (D->isArrayDesignator()) {
2134 IndexExpr = DIE->getArrayIndex(*D);
2135 DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context);
2136 DesignatedEndIndex = DesignatedStartIndex;
2138 assert(D->isArrayRangeDesignator() && "Need array-range designator");
2140 DesignatedStartIndex =
2141 DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context);
2142 DesignatedEndIndex =
2143 DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context);
2144 IndexExpr = DIE->getArrayRangeEnd(*D);
2146 // Codegen can't handle evaluating array range designators that have side
2147 // effects, because we replicate the AST value for each initialized element.
2148 // As such, set the sawArrayRangeDesignator() bit if we initialize multiple
2149 // elements with something that has a side effect, so codegen can emit an
2150 // "error unsupported" error instead of miscompiling the app.
2151 if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&&
2152 DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly)
2153 FullyStructuredList->sawArrayRangeDesignator();
2156 if (isa<ConstantArrayType>(AT)) {
2157 llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
2158 DesignatedStartIndex
2159 = DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
2160 DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
2162 = DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
2163 DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
2164 if (DesignatedEndIndex >= MaxElements) {
2166 SemaRef.Diag(IndexExpr->getLocStart(),
2167 diag::err_array_designator_too_large)
2168 << DesignatedEndIndex.toString(10) << MaxElements.toString(10)
2169 << IndexExpr->getSourceRange();
2174 // Make sure the bit-widths and signedness match.
2175 if (DesignatedStartIndex.getBitWidth() > DesignatedEndIndex.getBitWidth())
2177 = DesignatedEndIndex.extend(DesignatedStartIndex.getBitWidth());
2178 else if (DesignatedStartIndex.getBitWidth() <
2179 DesignatedEndIndex.getBitWidth())
2180 DesignatedStartIndex
2181 = DesignatedStartIndex.extend(DesignatedEndIndex.getBitWidth());
2182 DesignatedStartIndex.setIsUnsigned(true);
2183 DesignatedEndIndex.setIsUnsigned(true);
2186 if (!VerifyOnly && StructuredList->isStringLiteralInit()) {
2187 // We're modifying a string literal init; we have to decompose the string
2188 // so we can modify the individual characters.
2189 ASTContext &Context = SemaRef.Context;
2190 Expr *SubExpr = StructuredList->getInit(0)->IgnoreParens();
2192 // Compute the character type
2193 QualType CharTy = AT->getElementType();
2195 // Compute the type of the integer literals.
2196 QualType PromotedCharTy = CharTy;
2197 if (CharTy->isPromotableIntegerType())
2198 PromotedCharTy = Context.getPromotedIntegerType(CharTy);
2199 unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy);
2201 if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) {
2202 // Get the length of the string.
2203 uint64_t StrLen = SL->getLength();
2204 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2205 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2206 StructuredList->resizeInits(Context, StrLen);
2208 // Build a literal for each character in the string, and put them into
2210 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2211 llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i));
2212 Expr *Init = new (Context) IntegerLiteral(
2213 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2214 if (CharTy != PromotedCharTy)
2215 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2216 Init, nullptr, VK_RValue);
2217 StructuredList->updateInit(Context, i, Init);
2220 ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr);
2222 Context.getObjCEncodingForType(E->getEncodedType(), Str);
2224 // Get the length of the string.
2225 uint64_t StrLen = Str.size();
2226 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2227 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2228 StructuredList->resizeInits(Context, StrLen);
2230 // Build a literal for each character in the string, and put them into
2232 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2233 llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]);
2234 Expr *Init = new (Context) IntegerLiteral(
2235 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2236 if (CharTy != PromotedCharTy)
2237 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2238 Init, nullptr, VK_RValue);
2239 StructuredList->updateInit(Context, i, Init);
2244 // Make sure that our non-designated initializer list has space
2245 // for a subobject corresponding to this array element.
2247 DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
2248 StructuredList->resizeInits(SemaRef.Context,
2249 DesignatedEndIndex.getZExtValue() + 1);
2251 // Repeatedly perform subobject initializations in the range
2252 // [DesignatedStartIndex, DesignatedEndIndex].
2254 // Move to the next designator
2255 unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
2256 unsigned OldIndex = Index;
2258 InitializedEntity ElementEntity =
2259 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
2261 while (DesignatedStartIndex <= DesignatedEndIndex) {
2262 // Recurse to check later designated subobjects.
2263 QualType ElementType = AT->getElementType();
2266 ElementEntity.setElementIndex(ElementIndex);
2267 if (CheckDesignatedInitializer(ElementEntity, IList, DIE, DesigIdx + 1,
2268 ElementType, nullptr, nullptr, Index,
2269 StructuredList, ElementIndex,
2270 (DesignatedStartIndex == DesignatedEndIndex),
2274 // Move to the next index in the array that we'll be initializing.
2275 ++DesignatedStartIndex;
2276 ElementIndex = DesignatedStartIndex.getZExtValue();
2279 // If this the first designator, our caller will continue checking
2280 // the rest of this array subobject.
2281 if (IsFirstDesignator) {
2282 if (NextElementIndex)
2283 *NextElementIndex = DesignatedStartIndex;
2284 StructuredIndex = ElementIndex;
2288 if (!FinishSubobjectInit)
2291 // Check the remaining elements within this array subobject.
2292 bool prevHadError = hadError;
2293 CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex,
2294 /*SubobjectIsDesignatorContext=*/false, Index,
2295 StructuredList, ElementIndex);
2296 return hadError && !prevHadError;
2299 // Get the structured initializer list for a subobject of type
2300 // @p CurrentObjectType.
2302 InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
2303 QualType CurrentObjectType,
2304 InitListExpr *StructuredList,
2305 unsigned StructuredIndex,
2306 SourceRange InitRange) {
2308 return nullptr; // No structured list in verification-only mode.
2309 Expr *ExistingInit = nullptr;
2310 if (!StructuredList)
2311 ExistingInit = SyntacticToSemantic.lookup(IList);
2312 else if (StructuredIndex < StructuredList->getNumInits())
2313 ExistingInit = StructuredList->getInit(StructuredIndex);
2315 if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
2319 // We are creating an initializer list that initializes the
2320 // subobjects of the current object, but there was already an
2321 // initialization that completely initialized the current
2322 // subobject, e.g., by a compound literal:
2324 // struct X { int a, b; };
2325 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
2327 // Here, xs[0].a == 0 and xs[0].b == 3, since the second,
2328 // designated initializer re-initializes the whole
2329 // subobject [0], overwriting previous initializers.
2330 SemaRef.Diag(InitRange.getBegin(),
2331 diag::warn_subobject_initializer_overrides)
2333 SemaRef.Diag(ExistingInit->getLocStart(),
2334 diag::note_previous_initializer)
2335 << /*FIXME:has side effects=*/0
2336 << ExistingInit->getSourceRange();
2339 InitListExpr *Result
2340 = new (SemaRef.Context) InitListExpr(SemaRef.Context,
2341 InitRange.getBegin(), None,
2342 InitRange.getEnd());
2344 QualType ResultType = CurrentObjectType;
2345 if (!ResultType->isArrayType())
2346 ResultType = ResultType.getNonLValueExprType(SemaRef.Context);
2347 Result->setType(ResultType);
2349 // Pre-allocate storage for the structured initializer list.
2350 unsigned NumElements = 0;
2351 unsigned NumInits = 0;
2352 bool GotNumInits = false;
2353 if (!StructuredList) {
2354 NumInits = IList->getNumInits();
2356 } else if (Index < IList->getNumInits()) {
2357 if (InitListExpr *SubList = dyn_cast<InitListExpr>(IList->getInit(Index))) {
2358 NumInits = SubList->getNumInits();
2363 if (const ArrayType *AType
2364 = SemaRef.Context.getAsArrayType(CurrentObjectType)) {
2365 if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
2366 NumElements = CAType->getSize().getZExtValue();
2367 // Simple heuristic so that we don't allocate a very large
2368 // initializer with many empty entries at the end.
2369 if (GotNumInits && NumElements > NumInits)
2372 } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>())
2373 NumElements = VType->getNumElements();
2374 else if (const RecordType *RType = CurrentObjectType->getAs<RecordType>()) {
2375 RecordDecl *RDecl = RType->getDecl();
2376 if (RDecl->isUnion())
2379 NumElements = std::distance(RDecl->field_begin(), RDecl->field_end());
2382 Result->reserveInits(SemaRef.Context, NumElements);
2384 // Link this new initializer list into the structured initializer
2387 StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result);
2389 Result->setSyntacticForm(IList);
2390 SyntacticToSemantic[IList] = Result;
2396 /// Update the initializer at index @p StructuredIndex within the
2397 /// structured initializer list to the value @p expr.
2398 void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
2399 unsigned &StructuredIndex,
2401 // No structured initializer list to update
2402 if (!StructuredList)
2405 if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context,
2406 StructuredIndex, expr)) {
2407 // This initializer overwrites a previous initializer. Warn.
2408 SemaRef.Diag(expr->getLocStart(),
2409 diag::warn_initializer_overrides)
2410 << expr->getSourceRange();
2411 SemaRef.Diag(PrevInit->getLocStart(),
2412 diag::note_previous_initializer)
2413 << /*FIXME:has side effects=*/0
2414 << PrevInit->getSourceRange();
2420 /// Check that the given Index expression is a valid array designator
2421 /// value. This is essentially just a wrapper around
2422 /// VerifyIntegerConstantExpression that also checks for negative values
2423 /// and produces a reasonable diagnostic if there is a
2424 /// failure. Returns the index expression, possibly with an implicit cast
2425 /// added, on success. If everything went okay, Value will receive the
2426 /// value of the constant expression.
2428 CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) {
2429 SourceLocation Loc = Index->getLocStart();
2431 // Make sure this is an integer constant expression.
2432 ExprResult Result = S.VerifyIntegerConstantExpression(Index, &Value);
2433 if (Result.isInvalid())
2436 if (Value.isSigned() && Value.isNegative())
2437 return S.Diag(Loc, diag::err_array_designator_negative)
2438 << Value.toString(10) << Index->getSourceRange();
2440 Value.setIsUnsigned(true);
2444 ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
2448 typedef DesignatedInitExpr::Designator ASTDesignator;
2450 bool Invalid = false;
2451 SmallVector<ASTDesignator, 32> Designators;
2452 SmallVector<Expr *, 32> InitExpressions;
2454 // Build designators and check array designator expressions.
2455 for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
2456 const Designator &D = Desig.getDesignator(Idx);
2457 switch (D.getKind()) {
2458 case Designator::FieldDesignator:
2459 Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
2463 case Designator::ArrayDesignator: {
2464 Expr *Index = static_cast<Expr *>(D.getArrayIndex());
2465 llvm::APSInt IndexValue;
2466 if (!Index->isTypeDependent() && !Index->isValueDependent())
2467 Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get();
2471 Designators.push_back(ASTDesignator(InitExpressions.size(),
2473 D.getRBracketLoc()));
2474 InitExpressions.push_back(Index);
2479 case Designator::ArrayRangeDesignator: {
2480 Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
2481 Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
2482 llvm::APSInt StartValue;
2483 llvm::APSInt EndValue;
2484 bool StartDependent = StartIndex->isTypeDependent() ||
2485 StartIndex->isValueDependent();
2486 bool EndDependent = EndIndex->isTypeDependent() ||
2487 EndIndex->isValueDependent();
2488 if (!StartDependent)
2490 CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get();
2492 EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get();
2494 if (!StartIndex || !EndIndex)
2497 // Make sure we're comparing values with the same bit width.
2498 if (StartDependent || EndDependent) {
2499 // Nothing to compute.
2500 } else if (StartValue.getBitWidth() > EndValue.getBitWidth())
2501 EndValue = EndValue.extend(StartValue.getBitWidth());
2502 else if (StartValue.getBitWidth() < EndValue.getBitWidth())
2503 StartValue = StartValue.extend(EndValue.getBitWidth());
2505 if (!StartDependent && !EndDependent && EndValue < StartValue) {
2506 Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
2507 << StartValue.toString(10) << EndValue.toString(10)
2508 << StartIndex->getSourceRange() << EndIndex->getSourceRange();
2511 Designators.push_back(ASTDesignator(InitExpressions.size(),
2514 D.getRBracketLoc()));
2515 InitExpressions.push_back(StartIndex);
2516 InitExpressions.push_back(EndIndex);
2524 if (Invalid || Init.isInvalid())
2527 // Clear out the expressions within the designation.
2528 Desig.ClearExprs(*this);
2530 DesignatedInitExpr *DIE
2531 = DesignatedInitExpr::Create(Context,
2532 Designators.data(), Designators.size(),
2533 InitExpressions, Loc, GNUSyntax,
2534 Init.getAs<Expr>());
2536 if (!getLangOpts().C99)
2537 Diag(DIE->getLocStart(), diag::ext_designated_init)
2538 << DIE->getSourceRange();
2543 //===----------------------------------------------------------------------===//
2544 // Initialization entity
2545 //===----------------------------------------------------------------------===//
2547 InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index,
2548 const InitializedEntity &Parent)
2549 : Parent(&Parent), Index(Index)
2551 if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) {
2552 Kind = EK_ArrayElement;
2553 Type = AT->getElementType();
2554 } else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) {
2555 Kind = EK_VectorElement;
2556 Type = VT->getElementType();
2558 const ComplexType *CT = Parent.getType()->getAs<ComplexType>();
2559 assert(CT && "Unexpected type");
2560 Kind = EK_ComplexElement;
2561 Type = CT->getElementType();
2566 InitializedEntity::InitializeBase(ASTContext &Context,
2567 const CXXBaseSpecifier *Base,
2568 bool IsInheritedVirtualBase) {
2569 InitializedEntity Result;
2570 Result.Kind = EK_Base;
2571 Result.Parent = nullptr;
2572 Result.Base = reinterpret_cast<uintptr_t>(Base);
2573 if (IsInheritedVirtualBase)
2574 Result.Base |= 0x01;
2576 Result.Type = Base->getType();
2580 DeclarationName InitializedEntity::getName() const {
2581 switch (getKind()) {
2583 case EK_Parameter_CF_Audited: {
2584 ParmVarDecl *D = reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
2585 return (D ? D->getDeclName() : DeclarationName());
2590 return VariableOrMember->getDeclName();
2592 case EK_LambdaCapture:
2593 return DeclarationName(Capture.VarID);
2601 case EK_ArrayElement:
2602 case EK_VectorElement:
2603 case EK_ComplexElement:
2604 case EK_BlockElement:
2605 case EK_CompoundLiteralInit:
2606 case EK_RelatedResult:
2607 return DeclarationName();
2610 llvm_unreachable("Invalid EntityKind!");
2613 DeclaratorDecl *InitializedEntity::getDecl() const {
2614 switch (getKind()) {
2617 return VariableOrMember;
2620 case EK_Parameter_CF_Audited:
2621 return reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
2629 case EK_ArrayElement:
2630 case EK_VectorElement:
2631 case EK_ComplexElement:
2632 case EK_BlockElement:
2633 case EK_LambdaCapture:
2634 case EK_CompoundLiteralInit:
2635 case EK_RelatedResult:
2639 llvm_unreachable("Invalid EntityKind!");
2642 bool InitializedEntity::allowsNRVO() const {
2643 switch (getKind()) {
2646 return LocAndNRVO.NRVO;
2650 case EK_Parameter_CF_Audited:
2654 case EK_CompoundLiteralInit:
2657 case EK_ArrayElement:
2658 case EK_VectorElement:
2659 case EK_ComplexElement:
2660 case EK_BlockElement:
2661 case EK_LambdaCapture:
2662 case EK_RelatedResult:
2669 unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const {
2670 assert(getParent() != this);
2671 unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0;
2672 for (unsigned I = 0; I != Depth; ++I)
2675 switch (getKind()) {
2676 case EK_Variable: OS << "Variable"; break;
2677 case EK_Parameter: OS << "Parameter"; break;
2678 case EK_Parameter_CF_Audited: OS << "CF audited function Parameter";
2680 case EK_Result: OS << "Result"; break;
2681 case EK_Exception: OS << "Exception"; break;
2682 case EK_Member: OS << "Member"; break;
2683 case EK_New: OS << "New"; break;
2684 case EK_Temporary: OS << "Temporary"; break;
2685 case EK_CompoundLiteralInit: OS << "CompoundLiteral";break;
2686 case EK_RelatedResult: OS << "RelatedResult"; break;
2687 case EK_Base: OS << "Base"; break;
2688 case EK_Delegating: OS << "Delegating"; break;
2689 case EK_ArrayElement: OS << "ArrayElement " << Index; break;
2690 case EK_VectorElement: OS << "VectorElement " << Index; break;
2691 case EK_ComplexElement: OS << "ComplexElement " << Index; break;
2692 case EK_BlockElement: OS << "Block"; break;
2693 case EK_LambdaCapture:
2694 OS << "LambdaCapture ";
2695 OS << DeclarationName(Capture.VarID);
2699 if (Decl *D = getDecl()) {
2701 cast<NamedDecl>(D)->printQualifiedName(OS);
2704 OS << " '" << getType().getAsString() << "'\n";
2709 void InitializedEntity::dump() const {
2710 dumpImpl(llvm::errs());
2713 //===----------------------------------------------------------------------===//
2714 // Initialization sequence
2715 //===----------------------------------------------------------------------===//
2717 void InitializationSequence::Step::Destroy() {
2719 case SK_ResolveAddressOfOverloadedFunction:
2720 case SK_CastDerivedToBaseRValue:
2721 case SK_CastDerivedToBaseXValue:
2722 case SK_CastDerivedToBaseLValue:
2723 case SK_BindReference:
2724 case SK_BindReferenceToTemporary:
2725 case SK_ExtraneousCopyToTemporary:
2726 case SK_UserConversion:
2727 case SK_QualificationConversionRValue:
2728 case SK_QualificationConversionXValue:
2729 case SK_QualificationConversionLValue:
2730 case SK_AtomicConversion:
2731 case SK_LValueToRValue:
2732 case SK_ListInitialization:
2733 case SK_UnwrapInitList:
2734 case SK_RewrapInitList:
2735 case SK_ConstructorInitialization:
2736 case SK_ConstructorInitializationFromList:
2737 case SK_ZeroInitialization:
2738 case SK_CAssignment:
2740 case SK_ObjCObjectConversion:
2742 case SK_ParenthesizedArrayInit:
2743 case SK_PassByIndirectCopyRestore:
2744 case SK_PassByIndirectRestore:
2745 case SK_ProduceObjCObject:
2746 case SK_StdInitializerList:
2747 case SK_StdInitializerListConstructorCall:
2748 case SK_OCLSamplerInit:
2749 case SK_OCLZeroEvent:
2752 case SK_ConversionSequence:
2753 case SK_ConversionSequenceNoNarrowing:
2758 bool InitializationSequence::isDirectReferenceBinding() const {
2759 return !Steps.empty() && Steps.back().Kind == SK_BindReference;
2762 bool InitializationSequence::isAmbiguous() const {
2766 switch (getFailureKind()) {
2767 case FK_TooManyInitsForReference:
2768 case FK_ArrayNeedsInitList:
2769 case FK_ArrayNeedsInitListOrStringLiteral:
2770 case FK_ArrayNeedsInitListOrWideStringLiteral:
2771 case FK_NarrowStringIntoWideCharArray:
2772 case FK_WideStringIntoCharArray:
2773 case FK_IncompatWideStringIntoWideChar:
2774 case FK_AddressOfOverloadFailed: // FIXME: Could do better
2775 case FK_NonConstLValueReferenceBindingToTemporary:
2776 case FK_NonConstLValueReferenceBindingToUnrelated:
2777 case FK_RValueReferenceBindingToLValue:
2778 case FK_ReferenceInitDropsQualifiers:
2779 case FK_ReferenceInitFailed:
2780 case FK_ConversionFailed:
2781 case FK_ConversionFromPropertyFailed:
2782 case FK_TooManyInitsForScalar:
2783 case FK_ReferenceBindingToInitList:
2784 case FK_InitListBadDestinationType:
2785 case FK_DefaultInitOfConst:
2787 case FK_ArrayTypeMismatch:
2788 case FK_NonConstantArrayInit:
2789 case FK_ListInitializationFailed:
2790 case FK_VariableLengthArrayHasInitializer:
2791 case FK_PlaceholderType:
2792 case FK_ExplicitConstructor:
2795 case FK_ReferenceInitOverloadFailed:
2796 case FK_UserConversionOverloadFailed:
2797 case FK_ConstructorOverloadFailed:
2798 case FK_ListConstructorOverloadFailed:
2799 return FailedOverloadResult == OR_Ambiguous;
2802 llvm_unreachable("Invalid EntityKind!");
2805 bool InitializationSequence::isConstructorInitialization() const {
2806 return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization;
2810 InitializationSequence
2811 ::AddAddressOverloadResolutionStep(FunctionDecl *Function,
2812 DeclAccessPair Found,
2813 bool HadMultipleCandidates) {
2815 S.Kind = SK_ResolveAddressOfOverloadedFunction;
2816 S.Type = Function->getType();
2817 S.Function.HadMultipleCandidates = HadMultipleCandidates;
2818 S.Function.Function = Function;
2819 S.Function.FoundDecl = Found;
2823 void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType,
2827 case VK_RValue: S.Kind = SK_CastDerivedToBaseRValue; break;
2828 case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break;
2829 case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break;
2835 void InitializationSequence::AddReferenceBindingStep(QualType T,
2836 bool BindingTemporary) {
2838 S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
2843 void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) {
2845 S.Kind = SK_ExtraneousCopyToTemporary;
2851 InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
2852 DeclAccessPair FoundDecl,
2854 bool HadMultipleCandidates) {
2856 S.Kind = SK_UserConversion;
2858 S.Function.HadMultipleCandidates = HadMultipleCandidates;
2859 S.Function.Function = Function;
2860 S.Function.FoundDecl = FoundDecl;
2864 void InitializationSequence::AddQualificationConversionStep(QualType Ty,
2867 S.Kind = SK_QualificationConversionRValue; // work around a gcc warning
2870 S.Kind = SK_QualificationConversionRValue;
2873 S.Kind = SK_QualificationConversionXValue;
2876 S.Kind = SK_QualificationConversionLValue;
2883 void InitializationSequence::AddAtomicConversionStep(QualType Ty) {
2885 S.Kind = SK_AtomicConversion;
2890 void InitializationSequence::AddLValueToRValueStep(QualType Ty) {
2891 assert(!Ty.hasQualifiers() && "rvalues may not have qualifiers");
2894 S.Kind = SK_LValueToRValue;
2899 void InitializationSequence::AddConversionSequenceStep(
2900 const ImplicitConversionSequence &ICS, QualType T,
2901 bool TopLevelOfInitList) {
2903 S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing
2904 : SK_ConversionSequence;
2906 S.ICS = new ImplicitConversionSequence(ICS);
2910 void InitializationSequence::AddListInitializationStep(QualType T) {
2912 S.Kind = SK_ListInitialization;
2918 InitializationSequence
2919 ::AddConstructorInitializationStep(CXXConstructorDecl *Constructor,
2920 AccessSpecifier Access,
2922 bool HadMultipleCandidates,
2923 bool FromInitList, bool AsInitList) {
2925 S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall
2926 : SK_ConstructorInitializationFromList
2927 : SK_ConstructorInitialization;
2929 S.Function.HadMultipleCandidates = HadMultipleCandidates;
2930 S.Function.Function = Constructor;
2931 S.Function.FoundDecl = DeclAccessPair::make(Constructor, Access);
2935 void InitializationSequence::AddZeroInitializationStep(QualType T) {
2937 S.Kind = SK_ZeroInitialization;
2942 void InitializationSequence::AddCAssignmentStep(QualType T) {
2944 S.Kind = SK_CAssignment;
2949 void InitializationSequence::AddStringInitStep(QualType T) {
2951 S.Kind = SK_StringInit;
2956 void InitializationSequence::AddObjCObjectConversionStep(QualType T) {
2958 S.Kind = SK_ObjCObjectConversion;
2963 void InitializationSequence::AddArrayInitStep(QualType T) {
2965 S.Kind = SK_ArrayInit;
2970 void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) {
2972 S.Kind = SK_ParenthesizedArrayInit;
2977 void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type,
2980 s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore
2981 : SK_PassByIndirectRestore);
2986 void InitializationSequence::AddProduceObjCObjectStep(QualType T) {
2988 S.Kind = SK_ProduceObjCObject;
2993 void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) {
2995 S.Kind = SK_StdInitializerList;
3000 void InitializationSequence::AddOCLSamplerInitStep(QualType T) {
3002 S.Kind = SK_OCLSamplerInit;
3007 void InitializationSequence::AddOCLZeroEventStep(QualType T) {
3009 S.Kind = SK_OCLZeroEvent;
3014 void InitializationSequence::RewrapReferenceInitList(QualType T,
3015 InitListExpr *Syntactic) {
3016 assert(Syntactic->getNumInits() == 1 &&
3017 "Can only rewrap trivial init lists.");
3019 S.Kind = SK_UnwrapInitList;
3020 S.Type = Syntactic->getInit(0)->getType();
3021 Steps.insert(Steps.begin(), S);
3023 S.Kind = SK_RewrapInitList;
3025 S.WrappingSyntacticList = Syntactic;
3029 void InitializationSequence::SetOverloadFailure(FailureKind Failure,
3030 OverloadingResult Result) {
3031 setSequenceKind(FailedSequence);
3032 this->Failure = Failure;
3033 this->FailedOverloadResult = Result;
3036 //===----------------------------------------------------------------------===//
3037 // Attempt initialization
3038 //===----------------------------------------------------------------------===//
3040 static void MaybeProduceObjCObject(Sema &S,
3041 InitializationSequence &Sequence,
3042 const InitializedEntity &Entity) {
3043 if (!S.getLangOpts().ObjCAutoRefCount) return;
3045 /// When initializing a parameter, produce the value if it's marked
3046 /// __attribute__((ns_consumed)).
3047 if (Entity.isParameterKind()) {
3048 if (!Entity.isParameterConsumed())
3051 assert(Entity.getType()->isObjCRetainableType() &&
3052 "consuming an object of unretainable type?");
3053 Sequence.AddProduceObjCObjectStep(Entity.getType());
3055 /// When initializing a return value, if the return type is a
3056 /// retainable type, then returns need to immediately retain the
3057 /// object. If an autorelease is required, it will be done at the
3059 } else if (Entity.getKind() == InitializedEntity::EK_Result) {
3060 if (!Entity.getType()->isObjCRetainableType())
3063 Sequence.AddProduceObjCObjectStep(Entity.getType());
3067 static void TryListInitialization(Sema &S,
3068 const InitializedEntity &Entity,
3069 const InitializationKind &Kind,
3070 InitListExpr *InitList,
3071 InitializationSequence &Sequence);
3073 /// \brief When initializing from init list via constructor, handle
3074 /// initialization of an object of type std::initializer_list<T>.
3076 /// \return true if we have handled initialization of an object of type
3077 /// std::initializer_list<T>, false otherwise.
3078 static bool TryInitializerListConstruction(Sema &S,
3081 InitializationSequence &Sequence) {
3083 if (!S.isStdInitializerList(DestType, &E))
3086 if (S.RequireCompleteType(List->getExprLoc(), E, 0)) {
3087 Sequence.setIncompleteTypeFailure(E);
3091 // Try initializing a temporary array from the init list.
3092 QualType ArrayType = S.Context.getConstantArrayType(
3093 E.withConst(), llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
3094 List->getNumInits()),
3095 clang::ArrayType::Normal, 0);
3096 InitializedEntity HiddenArray =
3097 InitializedEntity::InitializeTemporary(ArrayType);
3098 InitializationKind Kind =
3099 InitializationKind::CreateDirectList(List->getExprLoc());
3100 TryListInitialization(S, HiddenArray, Kind, List, Sequence);
3102 Sequence.AddStdInitializerListConstructionStep(DestType);
3106 static OverloadingResult
3107 ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc,
3109 OverloadCandidateSet &CandidateSet,
3110 ArrayRef<NamedDecl *> Ctors,
3111 OverloadCandidateSet::iterator &Best,
3112 bool CopyInitializing, bool AllowExplicit,
3113 bool OnlyListConstructors, bool InitListSyntax) {
3114 CandidateSet.clear();
3116 for (ArrayRef<NamedDecl *>::iterator
3117 Con = Ctors.begin(), ConEnd = Ctors.end(); Con != ConEnd; ++Con) {
3118 NamedDecl *D = *Con;
3119 DeclAccessPair FoundDecl = DeclAccessPair::make(D, D->getAccess());
3120 bool SuppressUserConversions = false;
3122 // Find the constructor (which may be a template).
3123 CXXConstructorDecl *Constructor = nullptr;
3124 FunctionTemplateDecl *ConstructorTmpl = dyn_cast<FunctionTemplateDecl>(D);
3125 if (ConstructorTmpl)
3126 Constructor = cast<CXXConstructorDecl>(
3127 ConstructorTmpl->getTemplatedDecl());
3129 Constructor = cast<CXXConstructorDecl>(D);
3131 // C++11 [over.best.ics]p4:
3132 // However, when considering the argument of a constructor or
3133 // user-defined conversion function that is a candidate:
3134 // -- by 13.3.1.3 when invoked for the copying/moving of a temporary
3135 // in the second step of a class copy-initialization,
3136 // -- by 13.3.1.7 when passing the initializer list as a single
3137 // argument or when the initializer list has exactly one elementand
3138 // a conversion to some class X or reference to (possibly
3139 // cv-qualified) X is considered for the first parameter of a
3140 // constructor of X, or
3141 // -- by 13.3.1.4, 13.3.1.5, or 13.3.1.6 in all cases,
3142 // only standard conversion sequences and ellipsis conversion sequences
3144 if ((CopyInitializing || (InitListSyntax && Args.size() == 1)) &&
3145 Constructor->isCopyOrMoveConstructor())
3146 SuppressUserConversions = true;
3149 if (!Constructor->isInvalidDecl() &&
3150 (AllowExplicit || !Constructor->isExplicit()) &&
3151 (!OnlyListConstructors || S.isInitListConstructor(Constructor))) {
3152 if (ConstructorTmpl)
3153 S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl,
3154 /*ExplicitArgs*/ nullptr, Args,
3155 CandidateSet, SuppressUserConversions);
3157 // C++ [over.match.copy]p1:
3158 // - When initializing a temporary to be bound to the first parameter
3159 // of a constructor that takes a reference to possibly cv-qualified
3160 // T as its first argument, called with a single argument in the
3161 // context of direct-initialization, explicit conversion functions
3162 // are also considered.
3163 bool AllowExplicitConv = AllowExplicit && !CopyInitializing &&
3165 Constructor->isCopyOrMoveConstructor();
3166 S.AddOverloadCandidate(Constructor, FoundDecl, Args, CandidateSet,
3167 SuppressUserConversions,
3168 /*PartialOverloading=*/false,
3169 /*AllowExplicit=*/AllowExplicitConv);
3174 // Perform overload resolution and return the result.
3175 return CandidateSet.BestViableFunction(S, DeclLoc, Best);
3178 /// \brief Attempt initialization by constructor (C++ [dcl.init]), which
3179 /// enumerates the constructors of the initialized entity and performs overload
3180 /// resolution to select the best.
3181 /// If InitListSyntax is true, this is list-initialization of a non-aggregate
3183 static void TryConstructorInitialization(Sema &S,
3184 const InitializedEntity &Entity,
3185 const InitializationKind &Kind,
3186 MultiExprArg Args, QualType DestType,
3187 InitializationSequence &Sequence,
3188 bool InitListSyntax = false) {
3189 assert((!InitListSyntax || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&
3190 "InitListSyntax must come with a single initializer list argument.");
3192 // The type we're constructing needs to be complete.
3193 if (S.RequireCompleteType(Kind.getLocation(), DestType, 0)) {
3194 Sequence.setIncompleteTypeFailure(DestType);
3198 const RecordType *DestRecordType = DestType->getAs<RecordType>();
3199 assert(DestRecordType && "Constructor initialization requires record type");
3200 CXXRecordDecl *DestRecordDecl
3201 = cast<CXXRecordDecl>(DestRecordType->getDecl());
3203 // Build the candidate set directly in the initialization sequence
3204 // structure, so that it will persist if we fail.
3205 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
3207 // Determine whether we are allowed to call explicit constructors or
3208 // explicit conversion operators.
3209 bool AllowExplicit = Kind.AllowExplicit() || InitListSyntax;
3210 bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy;
3212 // - Otherwise, if T is a class type, constructors are considered. The
3213 // applicable constructors are enumerated, and the best one is chosen
3214 // through overload resolution.
3215 DeclContext::lookup_result R = S.LookupConstructors(DestRecordDecl);
3216 // The container holding the constructors can under certain conditions
3217 // be changed while iterating (e.g. because of deserialization).
3218 // To be safe we copy the lookup results to a new container.
3219 SmallVector<NamedDecl*, 16> Ctors(R.begin(), R.end());
3221 OverloadingResult Result = OR_No_Viable_Function;
3222 OverloadCandidateSet::iterator Best;
3223 bool AsInitializerList = false;
3225 // C++14 DR 1467 [over.match.list]p1:
3226 // When objects of non-aggregate type T are list-initialized, such that
3227 // 8.5.4 [dcl.init.list] specifies that overload resolution is performed
3228 // according to the rules in this section, overload resolution selects
3229 // the constructor in two phases:
3231 // C++11 [over.match.list]p1:
3232 // When objects of non-aggregate type T are list-initialized, overload
3233 // resolution selects the constructor in two phases:
3235 // - Initially, the candidate functions are the initializer-list
3236 // constructors of the class T and the argument list consists of the
3237 // initializer list as a single argument.
3238 if (InitListSyntax) {
3239 InitListExpr *ILE = cast<InitListExpr>(Args[0]);
3240 AsInitializerList = true;
3242 // If the initializer list has no elements and T has a default constructor,
3243 // the first phase is omitted.
3244 if (ILE->getNumInits() != 0 || !DestRecordDecl->hasDefaultConstructor())
3245 Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
3246 CandidateSet, Ctors, Best,
3247 CopyInitialization, AllowExplicit,
3248 /*OnlyListConstructor=*/true,
3251 // Time to unwrap the init list.
3252 Args = MultiExprArg(ILE->getInits(), ILE->getNumInits());
3255 // C++11 [over.match.list]p1:
3256 // - If no viable initializer-list constructor is found, overload resolution
3257 // is performed again, where the candidate functions are all the
3258 // constructors of the class T and the argument list consists of the
3259 // elements of the initializer list.
3260 if (Result == OR_No_Viable_Function) {
3261 AsInitializerList = false;
3262 Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
3263 CandidateSet, Ctors, Best,
3264 CopyInitialization, AllowExplicit,
3265 /*OnlyListConstructors=*/false,
3269 Sequence.SetOverloadFailure(InitListSyntax ?
3270 InitializationSequence::FK_ListConstructorOverloadFailed :
3271 InitializationSequence::FK_ConstructorOverloadFailed,
3276 // C++11 [dcl.init]p6:
3277 // If a program calls for the default initialization of an object
3278 // of a const-qualified type T, T shall be a class type with a
3279 // user-provided default constructor.
3280 if (Kind.getKind() == InitializationKind::IK_Default &&
3281 Entity.getType().isConstQualified() &&
3282 !cast<CXXConstructorDecl>(Best->Function)->isUserProvided()) {
3283 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
3287 // C++11 [over.match.list]p1:
3288 // In copy-list-initialization, if an explicit constructor is chosen, the
3289 // initializer is ill-formed.
3290 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
3291 if (InitListSyntax && !Kind.AllowExplicit() && CtorDecl->isExplicit()) {
3292 Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor);
3296 // Add the constructor initialization step. Any cv-qualification conversion is
3297 // subsumed by the initialization.
3298 bool HadMultipleCandidates = (CandidateSet.size() > 1);
3299 Sequence.AddConstructorInitializationStep(CtorDecl,
3300 Best->FoundDecl.getAccess(),
3301 DestType, HadMultipleCandidates,
3302 InitListSyntax, AsInitializerList);
3306 ResolveOverloadedFunctionForReferenceBinding(Sema &S,
3308 QualType &SourceType,
3309 QualType &UnqualifiedSourceType,
3310 QualType UnqualifiedTargetType,
3311 InitializationSequence &Sequence) {
3312 if (S.Context.getCanonicalType(UnqualifiedSourceType) ==
3313 S.Context.OverloadTy) {
3314 DeclAccessPair Found;
3315 bool HadMultipleCandidates = false;
3316 if (FunctionDecl *Fn
3317 = S.ResolveAddressOfOverloadedFunction(Initializer,
3318 UnqualifiedTargetType,
3320 &HadMultipleCandidates)) {
3321 Sequence.AddAddressOverloadResolutionStep(Fn, Found,
3322 HadMultipleCandidates);
3323 SourceType = Fn->getType();
3324 UnqualifiedSourceType = SourceType.getUnqualifiedType();
3325 } else if (!UnqualifiedTargetType->isRecordType()) {
3326 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
3333 static void TryReferenceInitializationCore(Sema &S,
3334 const InitializedEntity &Entity,
3335 const InitializationKind &Kind,
3337 QualType cv1T1, QualType T1,
3339 QualType cv2T2, QualType T2,
3341 InitializationSequence &Sequence);
3343 static void TryValueInitialization(Sema &S,
3344 const InitializedEntity &Entity,
3345 const InitializationKind &Kind,
3346 InitializationSequence &Sequence,
3347 InitListExpr *InitList = nullptr);
3349 /// \brief Attempt list initialization of a reference.
3350 static void TryReferenceListInitialization(Sema &S,
3351 const InitializedEntity &Entity,
3352 const InitializationKind &Kind,
3353 InitListExpr *InitList,
3354 InitializationSequence &Sequence) {
3355 // First, catch C++03 where this isn't possible.
3356 if (!S.getLangOpts().CPlusPlus11) {
3357 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
3361 QualType DestType = Entity.getType();
3362 QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
3364 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
3366 // Reference initialization via an initializer list works thus:
3367 // If the initializer list consists of a single element that is
3368 // reference-related to the referenced type, bind directly to that element
3369 // (possibly creating temporaries).
3370 // Otherwise, initialize a temporary with the initializer list and
3372 if (InitList->getNumInits() == 1) {
3373 Expr *Initializer = InitList->getInit(0);
3374 QualType cv2T2 = Initializer->getType();
3376 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
3378 // If this fails, creating a temporary wouldn't work either.
3379 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
3383 SourceLocation DeclLoc = Initializer->getLocStart();
3384 bool dummy1, dummy2, dummy3;
3385 Sema::ReferenceCompareResult RefRelationship
3386 = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, dummy1,
3388 if (RefRelationship >= Sema::Ref_Related) {
3389 // Try to bind the reference here.
3390 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
3391 T1Quals, cv2T2, T2, T2Quals, Sequence);
3393 Sequence.RewrapReferenceInitList(cv1T1, InitList);
3397 // Update the initializer if we've resolved an overloaded function.
3398 if (Sequence.step_begin() != Sequence.step_end())
3399 Sequence.RewrapReferenceInitList(cv1T1, InitList);
3402 // Not reference-related. Create a temporary and bind to that.
3403 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
3405 TryListInitialization(S, TempEntity, Kind, InitList, Sequence);
3407 if (DestType->isRValueReferenceType() ||
3408 (T1Quals.hasConst() && !T1Quals.hasVolatile()))
3409 Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
3412 InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
3416 /// \brief Attempt list initialization (C++0x [dcl.init.list])
3417 static void TryListInitialization(Sema &S,
3418 const InitializedEntity &Entity,
3419 const InitializationKind &Kind,
3420 InitListExpr *InitList,
3421 InitializationSequence &Sequence) {
3422 QualType DestType = Entity.getType();
3424 // C++ doesn't allow scalar initialization with more than one argument.
3425 // But C99 complex numbers are scalars and it makes sense there.
3426 if (S.getLangOpts().CPlusPlus && DestType->isScalarType() &&
3427 !DestType->isAnyComplexType() && InitList->getNumInits() > 1) {
3428 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
3431 if (DestType->isReferenceType()) {
3432 TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence);
3436 if (DestType->isRecordType() &&
3437 S.RequireCompleteType(InitList->getLocStart(), DestType, 0)) {
3438 Sequence.setIncompleteTypeFailure(DestType);
3442 // C++14 DR1467 [dcl.init.list]p3:
3443 // - If T is a class type and the initializer list has a single element of
3444 // type cv U, where U is T or a class derived from T, the object is
3445 // initialized from that element (by copy-initialization for
3446 // copy-list-initialization, or by direct-initialization for
3447 // direct-list-initialization).
3448 // - Otherwise, if T is a character array and the initializer list has a
3449 // single element that is an appropriately-typed string literal
3450 // (8.5.2 [dcl.init.string]), initialization is performed as described
3452 // - Otherwise, If T is an aggregate, [...] (continue below).
3453 if (S.getLangOpts().CPlusPlus14 && InitList->getNumInits() == 1) {
3454 if (DestType->isRecordType()) {
3455 QualType InitType = InitList->getInit(0)->getType();
3456 if (S.Context.hasSameUnqualifiedType(InitType, DestType) ||
3457 S.IsDerivedFrom(InitType, DestType)) {
3458 Expr *InitListAsExpr = InitList;
3459 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
3460 Sequence, /*InitListSyntax*/true);
3464 if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) {
3465 Expr *SubInit[1] = {InitList->getInit(0)};
3466 if (!isa<VariableArrayType>(DestAT) &&
3467 IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) {
3468 InitializationKind SubKind =
3469 Kind.getKind() == InitializationKind::IK_DirectList
3470 ? InitializationKind::CreateDirect(Kind.getLocation(),
3471 InitList->getLBraceLoc(),
3472 InitList->getRBraceLoc())
3474 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
3475 /*TopLevelOfInitList*/ true);
3477 // TryStringLiteralInitialization() (in InitializeFrom()) will fail if
3478 // the element is not an appropriately-typed string literal, in which
3479 // case we should proceed as in C++11 (below).
3481 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
3488 // C++11 [dcl.init.list]p3:
3489 // - If T is an aggregate, aggregate initialization is performed.
3490 if (DestType->isRecordType() && !DestType->isAggregateType()) {
3491 if (S.getLangOpts().CPlusPlus11) {
3492 // - Otherwise, if the initializer list has no elements and T is a
3493 // class type with a default constructor, the object is
3494 // value-initialized.
3495 if (InitList->getNumInits() == 0) {
3496 CXXRecordDecl *RD = DestType->getAsCXXRecordDecl();
3497 if (RD->hasDefaultConstructor()) {
3498 TryValueInitialization(S, Entity, Kind, Sequence, InitList);
3503 // - Otherwise, if T is a specialization of std::initializer_list<E>,
3504 // an initializer_list object constructed [...]
3505 if (TryInitializerListConstruction(S, InitList, DestType, Sequence))
3508 // - Otherwise, if T is a class type, constructors are considered.
3509 Expr *InitListAsExpr = InitList;
3510 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
3511 Sequence, /*InitListSyntax*/ true);
3513 Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
3517 if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() &&
3518 InitList->getNumInits() == 1 &&
3519 InitList->getInit(0)->getType()->isRecordType()) {
3520 // - Otherwise, if the initializer list has a single element of type E
3521 // [...references are handled above...], the object or reference is
3522 // initialized from that element; if a narrowing conversion is required
3523 // to convert the element to T, the program is ill-formed.
3526 // - Otherwise, if the initializer list has a single element of type E
3527 // [...references are handled above...], the object or reference is
3528 // initialized from that element (by copy-initialization for
3529 // copy-list-initialization, or by direct-initialization for
3530 // direct-list-initialization); if a narrowing conversion is required
3531 // to convert the element to T, the program is ill-formed.
3533 // Per core-24034, this is direct-initialization if we were performing
3534 // direct-list-initialization and copy-initialization otherwise.
3535 // We can't use InitListChecker for this, because it always performs
3536 // copy-initialization. This only matters if we might use an 'explicit'
3537 // conversion operator, so we only need to handle the cases where the source
3538 // is of record type.
3539 InitializationKind SubKind =
3540 Kind.getKind() == InitializationKind::IK_DirectList
3541 ? InitializationKind::CreateDirect(Kind.getLocation(),
3542 InitList->getLBraceLoc(),
3543 InitList->getRBraceLoc())
3545 Expr *SubInit[1] = { InitList->getInit(0) };
3546 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
3547 /*TopLevelOfInitList*/true);
3549 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
3553 InitListChecker CheckInitList(S, Entity, InitList,
3554 DestType, /*VerifyOnly=*/true);
3555 if (CheckInitList.HadError()) {
3556 Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed);
3560 // Add the list initialization step with the built init list.
3561 Sequence.AddListInitializationStep(DestType);
3564 /// \brief Try a reference initialization that involves calling a conversion
3566 static OverloadingResult TryRefInitWithConversionFunction(Sema &S,
3567 const InitializedEntity &Entity,
3568 const InitializationKind &Kind,
3571 InitializationSequence &Sequence) {
3572 QualType DestType = Entity.getType();
3573 QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
3574 QualType T1 = cv1T1.getUnqualifiedType();
3575 QualType cv2T2 = Initializer->getType();
3576 QualType T2 = cv2T2.getUnqualifiedType();
3579 bool ObjCConversion;
3580 bool ObjCLifetimeConversion;
3581 assert(!S.CompareReferenceRelationship(Initializer->getLocStart(),
3582 T1, T2, DerivedToBase,
3584 ObjCLifetimeConversion) &&
3585 "Must have incompatible references when binding via conversion");
3586 (void)DerivedToBase;
3587 (void)ObjCConversion;
3588 (void)ObjCLifetimeConversion;
3590 // Build the candidate set directly in the initialization sequence
3591 // structure, so that it will persist if we fail.
3592 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
3593 CandidateSet.clear();
3595 // Determine whether we are allowed to call explicit constructors or
3596 // explicit conversion operators.
3597 bool AllowExplicit = Kind.AllowExplicit();
3598 bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding();
3600 const RecordType *T1RecordType = nullptr;
3601 if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) &&
3602 !S.RequireCompleteType(Kind.getLocation(), T1, 0)) {
3603 // The type we're converting to is a class type. Enumerate its constructors
3604 // to see if there is a suitable conversion.
3605 CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
3607 DeclContext::lookup_result R = S.LookupConstructors(T1RecordDecl);
3608 // The container holding the constructors can under certain conditions
3609 // be changed while iterating (e.g. because of deserialization).
3610 // To be safe we copy the lookup results to a new container.
3611 SmallVector<NamedDecl*, 16> Ctors(R.begin(), R.end());
3612 for (SmallVectorImpl<NamedDecl *>::iterator
3613 CI = Ctors.begin(), CE = Ctors.end(); CI != CE; ++CI) {
3615 DeclAccessPair FoundDecl = DeclAccessPair::make(D, D->getAccess());
3617 // Find the constructor (which may be a template).
3618 CXXConstructorDecl *Constructor = nullptr;
3619 FunctionTemplateDecl *ConstructorTmpl = dyn_cast<FunctionTemplateDecl>(D);
3620 if (ConstructorTmpl)
3621 Constructor = cast<CXXConstructorDecl>(
3622 ConstructorTmpl->getTemplatedDecl());
3624 Constructor = cast<CXXConstructorDecl>(D);
3626 if (!Constructor->isInvalidDecl() &&
3627 Constructor->isConvertingConstructor(AllowExplicit)) {
3628 if (ConstructorTmpl)
3629 S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl,
3630 /*ExplicitArgs*/ nullptr,
3631 Initializer, CandidateSet,
3632 /*SuppressUserConversions=*/true);
3634 S.AddOverloadCandidate(Constructor, FoundDecl,
3635 Initializer, CandidateSet,
3636 /*SuppressUserConversions=*/true);
3640 if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl())
3641 return OR_No_Viable_Function;
3643 const RecordType *T2RecordType = nullptr;
3644 if ((T2RecordType = T2->getAs<RecordType>()) &&
3645 !S.RequireCompleteType(Kind.getLocation(), T2, 0)) {
3646 // The type we're converting from is a class type, enumerate its conversion
3648 CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
3650 std::pair<CXXRecordDecl::conversion_iterator,
3651 CXXRecordDecl::conversion_iterator>
3652 Conversions = T2RecordDecl->getVisibleConversionFunctions();
3653 for (CXXRecordDecl::conversion_iterator
3654 I = Conversions.first, E = Conversions.second; I != E; ++I) {
3656 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
3657 if (isa<UsingShadowDecl>(D))
3658 D = cast<UsingShadowDecl>(D)->getTargetDecl();
3660 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
3661 CXXConversionDecl *Conv;
3663 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
3665 Conv = cast<CXXConversionDecl>(D);
3667 // If the conversion function doesn't return a reference type,
3668 // it can't be considered for this conversion unless we're allowed to
3669 // consider rvalues.
3670 // FIXME: Do we need to make sure that we only consider conversion
3671 // candidates with reference-compatible results? That might be needed to
3673 if ((AllowExplicitConvs || !Conv->isExplicit()) &&
3674 (AllowRValues || Conv->getConversionType()->isLValueReferenceType())){
3676 S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
3677 ActingDC, Initializer,
3678 DestType, CandidateSet,
3679 /*AllowObjCConversionOnExplicit=*/
3682 S.AddConversionCandidate(Conv, I.getPair(), ActingDC,
3683 Initializer, DestType, CandidateSet,
3684 /*AllowObjCConversionOnExplicit=*/false);
3688 if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl())
3689 return OR_No_Viable_Function;
3691 SourceLocation DeclLoc = Initializer->getLocStart();
3693 // Perform overload resolution. If it fails, return the failed result.
3694 OverloadCandidateSet::iterator Best;
3695 if (OverloadingResult Result
3696 = CandidateSet.BestViableFunction(S, DeclLoc, Best, true))
3699 FunctionDecl *Function = Best->Function;
3700 // This is the overload that will be used for this initialization step if we
3701 // use this initialization. Mark it as referenced.
3702 Function->setReferenced();
3704 // Compute the returned type of the conversion.
3705 if (isa<CXXConversionDecl>(Function))
3706 T2 = Function->getReturnType();
3710 // Add the user-defined conversion step.
3711 bool HadMultipleCandidates = (CandidateSet.size() > 1);
3712 Sequence.AddUserConversionStep(Function, Best->FoundDecl,
3713 T2.getNonLValueExprType(S.Context),
3714 HadMultipleCandidates);
3716 // Determine whether we need to perform derived-to-base or
3717 // cv-qualification adjustments.
3718 ExprValueKind VK = VK_RValue;
3719 if (T2->isLValueReferenceType())
3721 else if (const RValueReferenceType *RRef = T2->getAs<RValueReferenceType>())
3722 VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue;
3724 bool NewDerivedToBase = false;
3725 bool NewObjCConversion = false;
3726 bool NewObjCLifetimeConversion = false;
3727 Sema::ReferenceCompareResult NewRefRelationship
3728 = S.CompareReferenceRelationship(DeclLoc, T1,
3729 T2.getNonLValueExprType(S.Context),
3730 NewDerivedToBase, NewObjCConversion,
3731 NewObjCLifetimeConversion);
3732 if (NewRefRelationship == Sema::Ref_Incompatible) {
3733 // If the type we've converted to is not reference-related to the
3734 // type we're looking for, then there is another conversion step
3735 // we need to perform to produce a temporary of the right type
3736 // that we'll be binding to.
3737 ImplicitConversionSequence ICS;
3739 ICS.Standard = Best->FinalConversion;
3740 T2 = ICS.Standard.getToType(2);
3741 Sequence.AddConversionSequenceStep(ICS, T2);
3742 } else if (NewDerivedToBase)
3743 Sequence.AddDerivedToBaseCastStep(
3744 S.Context.getQualifiedType(T1,
3745 T2.getNonReferenceType().getQualifiers()),
3747 else if (NewObjCConversion)
3748 Sequence.AddObjCObjectConversionStep(
3749 S.Context.getQualifiedType(T1,
3750 T2.getNonReferenceType().getQualifiers()));
3752 if (cv1T1.getQualifiers() != T2.getNonReferenceType().getQualifiers())
3753 Sequence.AddQualificationConversionStep(cv1T1, VK);
3755 Sequence.AddReferenceBindingStep(cv1T1, !T2->isReferenceType());
3759 static void CheckCXX98CompatAccessibleCopy(Sema &S,
3760 const InitializedEntity &Entity,
3763 /// \brief Attempt reference initialization (C++0x [dcl.init.ref])
3764 static void TryReferenceInitialization(Sema &S,
3765 const InitializedEntity &Entity,
3766 const InitializationKind &Kind,
3768 InitializationSequence &Sequence) {
3769 QualType DestType = Entity.getType();
3770 QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
3772 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
3773 QualType cv2T2 = Initializer->getType();
3775 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
3777 // If the initializer is the address of an overloaded function, try
3778 // to resolve the overloaded function. If all goes well, T2 is the
3779 // type of the resulting function.
3780 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
3784 // Delegate everything else to a subfunction.
3785 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
3786 T1Quals, cv2T2, T2, T2Quals, Sequence);
3789 /// Converts the target of reference initialization so that it has the
3790 /// appropriate qualifiers and value kind.
3792 /// In this case, 'x' is an 'int' lvalue, but it needs to be 'const int'.
3795 /// const int &r = x;
3798 /// In this case the reference is binding to a bitfield lvalue, which isn't
3799 /// valid. Perform a load to create a lifetime-extended temporary instead.
3801 /// const int &r = someStruct.bitfield;
3803 static ExprValueKind
3804 convertQualifiersAndValueKindIfNecessary(Sema &S,
3805 InitializationSequence &Sequence,
3811 bool IsNonAddressableType = Initializer->refersToBitField() ||
3812 Initializer->refersToVectorElement();
3814 if (IsNonAddressableType) {
3815 // C++11 [dcl.init.ref]p5: [...] Otherwise, the reference shall be an
3816 // lvalue reference to a non-volatile const type, or the reference shall be
3817 // an rvalue reference.
3819 // If not, we can't make a temporary and bind to that. Give up and allow the
3820 // error to be diagnosed later.
3821 if (IsLValueRef && (!T1Quals.hasConst() || T1Quals.hasVolatile())) {
3822 assert(Initializer->isGLValue());
3823 return Initializer->getValueKind();
3826 // Force a load so we can materialize a temporary.
3827 Sequence.AddLValueToRValueStep(cv1T1.getUnqualifiedType());
3831 if (T1Quals != T2Quals) {
3832 Sequence.AddQualificationConversionStep(cv1T1,
3833 Initializer->getValueKind());
3836 return Initializer->getValueKind();
3840 /// \brief Reference initialization without resolving overloaded functions.
3841 static void TryReferenceInitializationCore(Sema &S,
3842 const InitializedEntity &Entity,
3843 const InitializationKind &Kind,
3845 QualType cv1T1, QualType T1,
3847 QualType cv2T2, QualType T2,
3849 InitializationSequence &Sequence) {
3850 QualType DestType = Entity.getType();
3851 SourceLocation DeclLoc = Initializer->getLocStart();
3852 // Compute some basic properties of the types and the initializer.
3853 bool isLValueRef = DestType->isLValueReferenceType();
3854 bool isRValueRef = !isLValueRef;
3855 bool DerivedToBase = false;
3856 bool ObjCConversion = false;
3857 bool ObjCLifetimeConversion = false;
3858 Expr::Classification InitCategory = Initializer->Classify(S.Context);
3859 Sema::ReferenceCompareResult RefRelationship
3860 = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, DerivedToBase,
3861 ObjCConversion, ObjCLifetimeConversion);
3863 // C++0x [dcl.init.ref]p5:
3864 // A reference to type "cv1 T1" is initialized by an expression of type
3865 // "cv2 T2" as follows:
3867 // - If the reference is an lvalue reference and the initializer
3869 // Note the analogous bullet points for rvalue refs to functions. Because
3870 // there are no function rvalues in C++, rvalue refs to functions are treated
3871 // like lvalue refs.
3872 OverloadingResult ConvOvlResult = OR_Success;
3873 bool T1Function = T1->isFunctionType();
3874 if (isLValueRef || T1Function) {
3875 if (InitCategory.isLValue() &&
3876 (RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification ||
3877 (Kind.isCStyleOrFunctionalCast() &&
3878 RefRelationship == Sema::Ref_Related))) {
3879 // - is an lvalue (but is not a bit-field), and "cv1 T1" is
3880 // reference-compatible with "cv2 T2," or
3882 // Per C++ [over.best.ics]p2, we don't diagnose whether the lvalue is a
3883 // bit-field when we're determining whether the reference initialization
3884 // can occur. However, we do pay attention to whether it is a bit-field
3885 // to decide whether we're actually binding to a temporary created from
3888 Sequence.AddDerivedToBaseCastStep(
3889 S.Context.getQualifiedType(T1, T2Quals),
3891 else if (ObjCConversion)
3892 Sequence.AddObjCObjectConversionStep(
3893 S.Context.getQualifiedType(T1, T2Quals));
3895 ExprValueKind ValueKind =
3896 convertQualifiersAndValueKindIfNecessary(S, Sequence, Initializer,
3897 cv1T1, T1Quals, T2Quals,
3899 Sequence.AddReferenceBindingStep(cv1T1, ValueKind == VK_RValue);
3903 // - has a class type (i.e., T2 is a class type), where T1 is not
3904 // reference-related to T2, and can be implicitly converted to an
3905 // lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible
3906 // with "cv3 T3" (this conversion is selected by enumerating the
3907 // applicable conversion functions (13.3.1.6) and choosing the best
3908 // one through overload resolution (13.3)),
3909 // If we have an rvalue ref to function type here, the rhs must be
3910 // an rvalue. DR1287 removed the "implicitly" here.
3911 if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() &&
3912 (isLValueRef || InitCategory.isRValue())) {
3913 ConvOvlResult = TryRefInitWithConversionFunction(
3914 S, Entity, Kind, Initializer, /*AllowRValues*/isRValueRef, Sequence);
3915 if (ConvOvlResult == OR_Success)
3917 if (ConvOvlResult != OR_No_Viable_Function)
3918 Sequence.SetOverloadFailure(
3919 InitializationSequence::FK_ReferenceInitOverloadFailed,
3924 // - Otherwise, the reference shall be an lvalue reference to a
3925 // non-volatile const type (i.e., cv1 shall be const), or the reference
3926 // shall be an rvalue reference.
3927 if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile())) {
3928 if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
3929 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
3930 else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
3931 Sequence.SetOverloadFailure(
3932 InitializationSequence::FK_ReferenceInitOverloadFailed,
3935 Sequence.SetFailed(InitCategory.isLValue()
3936 ? (RefRelationship == Sema::Ref_Related
3937 ? InitializationSequence::FK_ReferenceInitDropsQualifiers
3938 : InitializationSequence::FK_NonConstLValueReferenceBindingToUnrelated)
3939 : InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
3944 // - If the initializer expression
3945 // - is an xvalue, class prvalue, array prvalue, or function lvalue and
3946 // "cv1 T1" is reference-compatible with "cv2 T2"
3947 // Note: functions are handled below.
3949 (RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification ||
3950 (Kind.isCStyleOrFunctionalCast() &&
3951 RefRelationship == Sema::Ref_Related)) &&
3952 (InitCategory.isXValue() ||
3953 (InitCategory.isPRValue() && T2->isRecordType()) ||
3954 (InitCategory.isPRValue() && T2->isArrayType()))) {
3955 ExprValueKind ValueKind = InitCategory.isXValue()? VK_XValue : VK_RValue;
3956 if (InitCategory.isPRValue() && T2->isRecordType()) {
3957 // The corresponding bullet in C++03 [dcl.init.ref]p5 gives the
3958 // compiler the freedom to perform a copy here or bind to the
3959 // object, while C++0x requires that we bind directly to the
3960 // object. Hence, we always bind to the object without making an
3961 // extra copy. However, in C++03 requires that we check for the
3962 // presence of a suitable copy constructor:
3964 // The constructor that would be used to make the copy shall
3965 // be callable whether or not the copy is actually done.
3966 if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt)
3967 Sequence.AddExtraneousCopyToTemporary(cv2T2);
3968 else if (S.getLangOpts().CPlusPlus11)
3969 CheckCXX98CompatAccessibleCopy(S, Entity, Initializer);
3973 Sequence.AddDerivedToBaseCastStep(S.Context.getQualifiedType(T1, T2Quals),
3975 else if (ObjCConversion)
3976 Sequence.AddObjCObjectConversionStep(
3977 S.Context.getQualifiedType(T1, T2Quals));
3979 ValueKind = convertQualifiersAndValueKindIfNecessary(S, Sequence,
3984 Sequence.AddReferenceBindingStep(cv1T1, ValueKind == VK_RValue);
3988 // - has a class type (i.e., T2 is a class type), where T1 is not
3989 // reference-related to T2, and can be implicitly converted to an
3990 // xvalue, class prvalue, or function lvalue of type "cv3 T3",
3991 // where "cv1 T1" is reference-compatible with "cv3 T3",
3993 // DR1287 removes the "implicitly" here.
3994 if (T2->isRecordType()) {
3995 if (RefRelationship == Sema::Ref_Incompatible) {
3996 ConvOvlResult = TryRefInitWithConversionFunction(
3997 S, Entity, Kind, Initializer, /*AllowRValues*/true, Sequence);
3999 Sequence.SetOverloadFailure(
4000 InitializationSequence::FK_ReferenceInitOverloadFailed,
4006 if ((RefRelationship == Sema::Ref_Compatible ||
4007 RefRelationship == Sema::Ref_Compatible_With_Added_Qualification) &&
4008 isRValueRef && InitCategory.isLValue()) {
4010 InitializationSequence::FK_RValueReferenceBindingToLValue);
4014 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
4018 // - Otherwise, a temporary of type "cv1 T1" is created and initialized
4019 // from the initializer expression using the rules for a non-reference
4020 // copy-initialization (8.5). The reference is then bound to the
4023 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
4025 // FIXME: Why do we use an implicit conversion here rather than trying
4026 // copy-initialization?
4027 ImplicitConversionSequence ICS
4028 = S.TryImplicitConversion(Initializer, TempEntity.getType(),
4029 /*SuppressUserConversions=*/false,
4030 /*AllowExplicit=*/false,
4031 /*FIXME:InOverloadResolution=*/false,
4032 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
4033 /*AllowObjCWritebackConversion=*/false);
4036 // FIXME: Use the conversion function set stored in ICS to turn
4037 // this into an overloading ambiguity diagnostic. However, we need
4038 // to keep that set as an OverloadCandidateSet rather than as some
4039 // other kind of set.
4040 if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
4041 Sequence.SetOverloadFailure(
4042 InitializationSequence::FK_ReferenceInitOverloadFailed,
4044 else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
4045 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4047 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
4050 Sequence.AddConversionSequenceStep(ICS, TempEntity.getType());
4053 // [...] If T1 is reference-related to T2, cv1 must be the
4054 // same cv-qualification as, or greater cv-qualification
4055 // than, cv2; otherwise, the program is ill-formed.
4056 unsigned T1CVRQuals = T1Quals.getCVRQualifiers();
4057 unsigned T2CVRQuals = T2Quals.getCVRQualifiers();
4058 if (RefRelationship == Sema::Ref_Related &&
4059 (T1CVRQuals | T2CVRQuals) != T1CVRQuals) {
4060 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
4064 // [...] If T1 is reference-related to T2 and the reference is an rvalue
4065 // reference, the initializer expression shall not be an lvalue.
4066 if (RefRelationship >= Sema::Ref_Related && !isLValueRef &&
4067 InitCategory.isLValue()) {
4069 InitializationSequence::FK_RValueReferenceBindingToLValue);
4073 Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
4077 /// \brief Attempt character array initialization from a string literal
4078 /// (C++ [dcl.init.string], C99 6.7.8).
4079 static void TryStringLiteralInitialization(Sema &S,
4080 const InitializedEntity &Entity,
4081 const InitializationKind &Kind,
4083 InitializationSequence &Sequence) {
4084 Sequence.AddStringInitStep(Entity.getType());
4087 /// \brief Attempt value initialization (C++ [dcl.init]p7).
4088 static void TryValueInitialization(Sema &S,
4089 const InitializedEntity &Entity,
4090 const InitializationKind &Kind,
4091 InitializationSequence &Sequence,
4092 InitListExpr *InitList) {
4093 assert((!InitList || InitList->getNumInits() == 0) &&
4094 "Shouldn't use value-init for non-empty init lists");
4096 // C++98 [dcl.init]p5, C++11 [dcl.init]p7:
4098 // To value-initialize an object of type T means:
4099 QualType T = Entity.getType();
4101 // -- if T is an array type, then each element is value-initialized;
4102 T = S.Context.getBaseElementType(T);
4104 if (const RecordType *RT = T->getAs<RecordType>()) {
4105 if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
4106 bool NeedZeroInitialization = true;
4107 if (!S.getLangOpts().CPlusPlus11) {
4109 // -- if T is a class type (clause 9) with a user-declared constructor
4110 // (12.1), then the default constructor for T is called (and the
4111 // initialization is ill-formed if T has no accessible default
4113 if (ClassDecl->hasUserDeclaredConstructor())
4114 NeedZeroInitialization = false;
4117 // -- if T is a class type (clause 9) with either no default constructor
4118 // (12.1 [class.ctor]) or a default constructor that is user-provided
4119 // or deleted, then the object is default-initialized;
4120 CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl);
4121 if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted())
4122 NeedZeroInitialization = false;
4125 // -- if T is a (possibly cv-qualified) non-union class type without a
4126 // user-provided or deleted default constructor, then the object is
4127 // zero-initialized and, if T has a non-trivial default constructor,
4128 // default-initialized;
4129 // The 'non-union' here was removed by DR1502. The 'non-trivial default
4130 // constructor' part was removed by DR1507.
4131 if (NeedZeroInitialization)
4132 Sequence.AddZeroInitializationStep(Entity.getType());
4135 // -- if T is a non-union class type without a user-declared constructor,
4136 // then every non-static data member and base class component of T is
4137 // value-initialized;
4138 // [...] A program that calls for [...] value-initialization of an
4139 // entity of reference type is ill-formed.
4141 // C++11 doesn't need this handling, because value-initialization does not
4142 // occur recursively there, and the implicit default constructor is
4143 // defined as deleted in the problematic cases.
4144 if (!S.getLangOpts().CPlusPlus11 &&
4145 ClassDecl->hasUninitializedReferenceMember()) {
4146 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference);
4150 // If this is list-value-initialization, pass the empty init list on when
4151 // building the constructor call. This affects the semantics of a few
4152 // things (such as whether an explicit default constructor can be called).
4153 Expr *InitListAsExpr = InitList;
4154 MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0);
4155 bool InitListSyntax = InitList;
4157 return TryConstructorInitialization(S, Entity, Kind, Args, T, Sequence,
4162 Sequence.AddZeroInitializationStep(Entity.getType());
4165 /// \brief Attempt default initialization (C++ [dcl.init]p6).
4166 static void TryDefaultInitialization(Sema &S,
4167 const InitializedEntity &Entity,
4168 const InitializationKind &Kind,
4169 InitializationSequence &Sequence) {
4170 assert(Kind.getKind() == InitializationKind::IK_Default);
4172 // C++ [dcl.init]p6:
4173 // To default-initialize an object of type T means:
4174 // - if T is an array type, each element is default-initialized;
4175 QualType DestType = S.Context.getBaseElementType(Entity.getType());
4177 // - if T is a (possibly cv-qualified) class type (Clause 9), the default
4178 // constructor for T is called (and the initialization is ill-formed if
4179 // T has no accessible default constructor);
4180 if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) {
4181 TryConstructorInitialization(S, Entity, Kind, None, DestType, Sequence);
4185 // - otherwise, no initialization is performed.
4187 // If a program calls for the default initialization of an object of
4188 // a const-qualified type T, T shall be a class type with a user-provided
4189 // default constructor.
4190 if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) {
4191 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
4195 // If the destination type has a lifetime property, zero-initialize it.
4196 if (DestType.getQualifiers().hasObjCLifetime()) {
4197 Sequence.AddZeroInitializationStep(Entity.getType());
4202 /// \brief Attempt a user-defined conversion between two types (C++ [dcl.init]),
4203 /// which enumerates all conversion functions and performs overload resolution
4204 /// to select the best.
4205 static void TryUserDefinedConversion(Sema &S,
4207 const InitializationKind &Kind,
4209 InitializationSequence &Sequence,
4210 bool TopLevelOfInitList) {
4211 assert(!DestType->isReferenceType() && "References are handled elsewhere");
4212 QualType SourceType = Initializer->getType();
4213 assert((DestType->isRecordType() || SourceType->isRecordType()) &&
4214 "Must have a class type to perform a user-defined conversion");
4216 // Build the candidate set directly in the initialization sequence
4217 // structure, so that it will persist if we fail.
4218 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4219 CandidateSet.clear();
4221 // Determine whether we are allowed to call explicit constructors or
4222 // explicit conversion operators.
4223 bool AllowExplicit = Kind.AllowExplicit();
4225 if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
4226 // The type we're converting to is a class type. Enumerate its constructors
4227 // to see if there is a suitable conversion.
4228 CXXRecordDecl *DestRecordDecl
4229 = cast<CXXRecordDecl>(DestRecordType->getDecl());
4231 // Try to complete the type we're converting to.
4232 if (!S.RequireCompleteType(Kind.getLocation(), DestType, 0)) {
4233 DeclContext::lookup_result R = S.LookupConstructors(DestRecordDecl);
4234 // The container holding the constructors can under certain conditions
4235 // be changed while iterating. To be safe we copy the lookup results
4236 // to a new container.
4237 SmallVector<NamedDecl*, 8> CopyOfCon(R.begin(), R.end());
4238 for (SmallVectorImpl<NamedDecl *>::iterator
4239 Con = CopyOfCon.begin(), ConEnd = CopyOfCon.end();
4240 Con != ConEnd; ++Con) {
4241 NamedDecl *D = *Con;
4242 DeclAccessPair FoundDecl = DeclAccessPair::make(D, D->getAccess());
4244 // Find the constructor (which may be a template).
4245 CXXConstructorDecl *Constructor = nullptr;
4246 FunctionTemplateDecl *ConstructorTmpl
4247 = dyn_cast<FunctionTemplateDecl>(D);
4248 if (ConstructorTmpl)
4249 Constructor = cast<CXXConstructorDecl>(
4250 ConstructorTmpl->getTemplatedDecl());
4252 Constructor = cast<CXXConstructorDecl>(D);
4254 if (!Constructor->isInvalidDecl() &&
4255 Constructor->isConvertingConstructor(AllowExplicit)) {
4256 if (ConstructorTmpl)
4257 S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl,
4258 /*ExplicitArgs*/ nullptr,
4259 Initializer, CandidateSet,
4260 /*SuppressUserConversions=*/true);
4262 S.AddOverloadCandidate(Constructor, FoundDecl,
4263 Initializer, CandidateSet,
4264 /*SuppressUserConversions=*/true);
4270 SourceLocation DeclLoc = Initializer->getLocStart();
4272 if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
4273 // The type we're converting from is a class type, enumerate its conversion
4276 // We can only enumerate the conversion functions for a complete type; if
4277 // the type isn't complete, simply skip this step.
4278 if (!S.RequireCompleteType(DeclLoc, SourceType, 0)) {
4279 CXXRecordDecl *SourceRecordDecl
4280 = cast<CXXRecordDecl>(SourceRecordType->getDecl());
4282 std::pair<CXXRecordDecl::conversion_iterator,
4283 CXXRecordDecl::conversion_iterator>
4284 Conversions = SourceRecordDecl->getVisibleConversionFunctions();
4285 for (CXXRecordDecl::conversion_iterator
4286 I = Conversions.first, E = Conversions.second; I != E; ++I) {
4288 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
4289 if (isa<UsingShadowDecl>(D))
4290 D = cast<UsingShadowDecl>(D)->getTargetDecl();
4292 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
4293 CXXConversionDecl *Conv;
4295 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
4297 Conv = cast<CXXConversionDecl>(D);
4299 if (AllowExplicit || !Conv->isExplicit()) {
4301 S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
4302 ActingDC, Initializer, DestType,
4303 CandidateSet, AllowExplicit);
4305 S.AddConversionCandidate(Conv, I.getPair(), ActingDC,
4306 Initializer, DestType, CandidateSet,
4313 // Perform overload resolution. If it fails, return the failed result.
4314 OverloadCandidateSet::iterator Best;
4315 if (OverloadingResult Result
4316 = CandidateSet.BestViableFunction(S, DeclLoc, Best, true)) {
4317 Sequence.SetOverloadFailure(
4318 InitializationSequence::FK_UserConversionOverloadFailed,
4323 FunctionDecl *Function = Best->Function;
4324 Function->setReferenced();
4325 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4327 if (isa<CXXConstructorDecl>(Function)) {
4328 // Add the user-defined conversion step. Any cv-qualification conversion is
4329 // subsumed by the initialization. Per DR5, the created temporary is of the
4330 // cv-unqualified type of the destination.
4331 Sequence.AddUserConversionStep(Function, Best->FoundDecl,
4332 DestType.getUnqualifiedType(),
4333 HadMultipleCandidates);
4337 // Add the user-defined conversion step that calls the conversion function.
4338 QualType ConvType = Function->getCallResultType();
4339 if (ConvType->getAs<RecordType>()) {
4340 // If we're converting to a class type, there may be an copy of
4341 // the resulting temporary object (possible to create an object of
4342 // a base class type). That copy is not a separate conversion, so
4343 // we just make a note of the actual destination type (possibly a
4344 // base class of the type returned by the conversion function) and
4345 // let the user-defined conversion step handle the conversion.
4346 Sequence.AddUserConversionStep(Function, Best->FoundDecl, DestType,
4347 HadMultipleCandidates);
4351 Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType,
4352 HadMultipleCandidates);
4354 // If the conversion following the call to the conversion function
4355 // is interesting, add it as a separate step.
4356 if (Best->FinalConversion.First || Best->FinalConversion.Second ||
4357 Best->FinalConversion.Third) {
4358 ImplicitConversionSequence ICS;
4360 ICS.Standard = Best->FinalConversion;
4361 Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
4365 /// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>,
4366 /// a function with a pointer return type contains a 'return false;' statement.
4367 /// In C++11, 'false' is not a null pointer, so this breaks the build of any
4368 /// code using that header.
4370 /// Work around this by treating 'return false;' as zero-initializing the result
4371 /// if it's used in a pointer-returning function in a system header.
4372 static bool isLibstdcxxPointerReturnFalseHack(Sema &S,
4373 const InitializedEntity &Entity,
4375 return S.getLangOpts().CPlusPlus11 &&
4376 Entity.getKind() == InitializedEntity::EK_Result &&
4377 Entity.getType()->isPointerType() &&
4378 isa<CXXBoolLiteralExpr>(Init) &&
4379 !cast<CXXBoolLiteralExpr>(Init)->getValue() &&
4380 S.getSourceManager().isInSystemHeader(Init->getExprLoc());
4383 /// The non-zero enum values here are indexes into diagnostic alternatives.
4384 enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar };
4386 /// Determines whether this expression is an acceptable ICR source.
4387 static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e,
4388 bool isAddressOf, bool &isWeakAccess) {
4390 e = e->IgnoreParens();
4392 // Skip address-of nodes.
4393 if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
4394 if (op->getOpcode() == UO_AddrOf)
4395 return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true,
4398 // Skip certain casts.
4399 } else if (CastExpr *ce = dyn_cast<CastExpr>(e)) {
4400 switch (ce->getCastKind()) {
4403 case CK_LValueBitCast:
4405 return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess);
4407 case CK_ArrayToPointerDecay:
4408 return IIK_nonscalar;
4410 case CK_NullToPointer:
4417 // If we have a declaration reference, it had better be a local variable.
4418 } else if (isa<DeclRefExpr>(e)) {
4419 // set isWeakAccess to true, to mean that there will be an implicit
4420 // load which requires a cleanup.
4421 if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
4422 isWeakAccess = true;
4424 if (!isAddressOf) return IIK_nonlocal;
4426 VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl());
4427 if (!var) return IIK_nonlocal;
4429 return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal);
4431 // If we have a conditional operator, check both sides.
4432 } else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) {
4433 if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf,
4437 return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess);
4439 // These are never scalar.
4440 } else if (isa<ArraySubscriptExpr>(e)) {
4441 return IIK_nonscalar;
4443 // Otherwise, it needs to be a null pointer constant.
4445 return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull)
4446 ? IIK_okay : IIK_nonlocal);
4449 return IIK_nonlocal;
4452 /// Check whether the given expression is a valid operand for an
4453 /// indirect copy/restore.
4454 static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) {
4455 assert(src->isRValue());
4456 bool isWeakAccess = false;
4457 InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess);
4458 // If isWeakAccess to true, there will be an implicit
4459 // load which requires a cleanup.
4460 if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess)
4461 S.ExprNeedsCleanups = true;
4463 if (iik == IIK_okay) return;
4465 S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback)
4466 << ((unsigned) iik - 1) // shift index into diagnostic explanations
4467 << src->getSourceRange();
4470 /// \brief Determine whether we have compatible array types for the
4471 /// purposes of GNU by-copy array initialization.
4472 static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest,
4473 const ArrayType *Source) {
4474 // If the source and destination array types are equivalent, we're
4476 if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0)))
4479 // Make sure that the element types are the same.
4480 if (!Context.hasSameType(Dest->getElementType(), Source->getElementType()))
4483 // The only mismatch we allow is when the destination is an
4484 // incomplete array type and the source is a constant array type.
4485 return Source->isConstantArrayType() && Dest->isIncompleteArrayType();
4488 static bool tryObjCWritebackConversion(Sema &S,
4489 InitializationSequence &Sequence,
4490 const InitializedEntity &Entity,
4491 Expr *Initializer) {
4492 bool ArrayDecay = false;
4493 QualType ArgType = Initializer->getType();
4494 QualType ArgPointee;
4495 if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) {
4497 ArgPointee = ArgArrayType->getElementType();
4498 ArgType = S.Context.getPointerType(ArgPointee);
4501 // Handle write-back conversion.
4502 QualType ConvertedArgType;
4503 if (!S.isObjCWritebackConversion(ArgType, Entity.getType(),
4507 // We should copy unless we're passing to an argument explicitly
4509 bool ShouldCopy = true;
4510 if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
4511 ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
4513 // Do we need an lvalue conversion?
4514 if (ArrayDecay || Initializer->isGLValue()) {
4515 ImplicitConversionSequence ICS;
4517 ICS.Standard.setAsIdentityConversion();
4519 QualType ResultType;
4521 ICS.Standard.First = ICK_Array_To_Pointer;
4522 ResultType = S.Context.getPointerType(ArgPointee);
4524 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
4525 ResultType = Initializer->getType().getNonLValueExprType(S.Context);
4528 Sequence.AddConversionSequenceStep(ICS, ResultType);
4531 Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy);
4535 static bool TryOCLSamplerInitialization(Sema &S,
4536 InitializationSequence &Sequence,
4538 Expr *Initializer) {
4539 if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() ||
4540 !Initializer->isIntegerConstantExpr(S.getASTContext()))
4543 Sequence.AddOCLSamplerInitStep(DestType);
4548 // OpenCL 1.2 spec, s6.12.10
4550 // The event argument can also be used to associate the
4551 // async_work_group_copy with a previous async copy allowing
4552 // an event to be shared by multiple async copies; otherwise
4553 // event should be zero.
4555 static bool TryOCLZeroEventInitialization(Sema &S,
4556 InitializationSequence &Sequence,
4558 Expr *Initializer) {
4559 if (!S.getLangOpts().OpenCL || !DestType->isEventT() ||
4560 !Initializer->isIntegerConstantExpr(S.getASTContext()) ||
4561 (Initializer->EvaluateKnownConstInt(S.getASTContext()) != 0))
4564 Sequence.AddOCLZeroEventStep(DestType);
4568 InitializationSequence::InitializationSequence(Sema &S,
4569 const InitializedEntity &Entity,
4570 const InitializationKind &Kind,
4572 bool TopLevelOfInitList)
4573 : FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) {
4574 InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList);
4577 void InitializationSequence::InitializeFrom(Sema &S,
4578 const InitializedEntity &Entity,
4579 const InitializationKind &Kind,
4581 bool TopLevelOfInitList) {
4582 ASTContext &Context = S.Context;
4584 // Eliminate non-overload placeholder types in the arguments. We
4585 // need to do this before checking whether types are dependent
4586 // because lowering a pseudo-object expression might well give us
4587 // something of dependent type.
4588 for (unsigned I = 0, E = Args.size(); I != E; ++I)
4589 if (Args[I]->getType()->isNonOverloadPlaceholderType()) {
4590 // FIXME: should we be doing this here?
4591 ExprResult result = S.CheckPlaceholderExpr(Args[I]);
4592 if (result.isInvalid()) {
4593 SetFailed(FK_PlaceholderType);
4596 Args[I] = result.get();
4599 // C++0x [dcl.init]p16:
4600 // The semantics of initializers are as follows. The destination type is
4601 // the type of the object or reference being initialized and the source
4602 // type is the type of the initializer expression. The source type is not
4603 // defined when the initializer is a braced-init-list or when it is a
4604 // parenthesized list of expressions.
4605 QualType DestType = Entity.getType();
4607 if (DestType->isDependentType() ||
4608 Expr::hasAnyTypeDependentArguments(Args)) {
4609 SequenceKind = DependentSequence;
4613 // Almost everything is a normal sequence.
4614 setSequenceKind(NormalSequence);
4616 QualType SourceType;
4617 Expr *Initializer = nullptr;
4618 if (Args.size() == 1) {
4619 Initializer = Args[0];
4620 if (S.getLangOpts().ObjC1) {
4621 if (S.CheckObjCBridgeRelatedConversions(Initializer->getLocStart(),
4622 DestType, Initializer->getType(),
4624 S.ConversionToObjCStringLiteralCheck(DestType, Initializer))
4625 Args[0] = Initializer;
4627 if (!isa<InitListExpr>(Initializer))
4628 SourceType = Initializer->getType();
4631 // - If the initializer is a (non-parenthesized) braced-init-list, the
4632 // object is list-initialized (8.5.4).
4633 if (Kind.getKind() != InitializationKind::IK_Direct) {
4634 if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
4635 TryListInitialization(S, Entity, Kind, InitList, *this);
4640 // - If the destination type is a reference type, see 8.5.3.
4641 if (DestType->isReferenceType()) {
4642 // C++0x [dcl.init.ref]p1:
4643 // A variable declared to be a T& or T&&, that is, "reference to type T"
4644 // (8.3.2), shall be initialized by an object, or function, of type T or
4645 // by an object that can be converted into a T.
4646 // (Therefore, multiple arguments are not permitted.)
4647 if (Args.size() != 1)
4648 SetFailed(FK_TooManyInitsForReference);
4650 TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
4654 // - If the initializer is (), the object is value-initialized.
4655 if (Kind.getKind() == InitializationKind::IK_Value ||
4656 (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) {
4657 TryValueInitialization(S, Entity, Kind, *this);
4661 // Handle default initialization.
4662 if (Kind.getKind() == InitializationKind::IK_Default) {
4663 TryDefaultInitialization(S, Entity, Kind, *this);
4667 // - If the destination type is an array of characters, an array of
4668 // char16_t, an array of char32_t, or an array of wchar_t, and the
4669 // initializer is a string literal, see 8.5.2.
4670 // - Otherwise, if the destination type is an array, the program is
4672 if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) {
4673 if (Initializer && isa<VariableArrayType>(DestAT)) {
4674 SetFailed(FK_VariableLengthArrayHasInitializer);
4679 switch (IsStringInit(Initializer, DestAT, Context)) {
4681 TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
4683 case SIF_NarrowStringIntoWideChar:
4684 SetFailed(FK_NarrowStringIntoWideCharArray);
4686 case SIF_WideStringIntoChar:
4687 SetFailed(FK_WideStringIntoCharArray);
4689 case SIF_IncompatWideStringIntoWideChar:
4690 SetFailed(FK_IncompatWideStringIntoWideChar);
4697 // Note: as an GNU C extension, we allow initialization of an
4698 // array from a compound literal that creates an array of the same
4699 // type, so long as the initializer has no side effects.
4700 if (!S.getLangOpts().CPlusPlus && Initializer &&
4701 isa<CompoundLiteralExpr>(Initializer->IgnoreParens()) &&
4702 Initializer->getType()->isArrayType()) {
4703 const ArrayType *SourceAT
4704 = Context.getAsArrayType(Initializer->getType());
4705 if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT))
4706 SetFailed(FK_ArrayTypeMismatch);
4707 else if (Initializer->HasSideEffects(S.Context))
4708 SetFailed(FK_NonConstantArrayInit);
4710 AddArrayInitStep(DestType);
4713 // Note: as a GNU C++ extension, we allow list-initialization of a
4714 // class member of array type from a parenthesized initializer list.
4715 else if (S.getLangOpts().CPlusPlus &&
4716 Entity.getKind() == InitializedEntity::EK_Member &&
4717 Initializer && isa<InitListExpr>(Initializer)) {
4718 TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer),
4720 AddParenthesizedArrayInitStep(DestType);
4721 } else if (DestAT->getElementType()->isCharType())
4722 SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
4723 else if (IsWideCharCompatible(DestAT->getElementType(), Context))
4724 SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral);
4726 SetFailed(FK_ArrayNeedsInitList);
4731 // Determine whether we should consider writeback conversions for
4733 bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount &&
4734 Entity.isParameterKind();
4736 // We're at the end of the line for C: it's either a write-back conversion
4737 // or it's a C assignment. There's no need to check anything else.
4738 if (!S.getLangOpts().CPlusPlus) {
4739 // If allowed, check whether this is an Objective-C writeback conversion.
4740 if (allowObjCWritebackConversion &&
4741 tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
4745 if (TryOCLSamplerInitialization(S, *this, DestType, Initializer))
4748 if (TryOCLZeroEventInitialization(S, *this, DestType, Initializer))
4751 // Handle initialization in C
4752 AddCAssignmentStep(DestType);
4753 MaybeProduceObjCObject(S, *this, Entity);
4757 assert(S.getLangOpts().CPlusPlus);
4759 // - If the destination type is a (possibly cv-qualified) class type:
4760 if (DestType->isRecordType()) {
4761 // - If the initialization is direct-initialization, or if it is
4762 // copy-initialization where the cv-unqualified version of the
4763 // source type is the same class as, or a derived class of, the
4764 // class of the destination, constructors are considered. [...]
4765 if (Kind.getKind() == InitializationKind::IK_Direct ||
4766 (Kind.getKind() == InitializationKind::IK_Copy &&
4767 (Context.hasSameUnqualifiedType(SourceType, DestType) ||
4768 S.IsDerivedFrom(SourceType, DestType))))
4769 TryConstructorInitialization(S, Entity, Kind, Args,
4771 // - Otherwise (i.e., for the remaining copy-initialization cases),
4772 // user-defined conversion sequences that can convert from the source
4773 // type to the destination type or (when a conversion function is
4774 // used) to a derived class thereof are enumerated as described in
4775 // 13.3.1.4, and the best one is chosen through overload resolution
4778 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
4779 TopLevelOfInitList);
4783 if (Args.size() > 1) {
4784 SetFailed(FK_TooManyInitsForScalar);
4787 assert(Args.size() == 1 && "Zero-argument case handled above");
4789 // - Otherwise, if the source type is a (possibly cv-qualified) class
4790 // type, conversion functions are considered.
4791 if (!SourceType.isNull() && SourceType->isRecordType()) {
4792 // For a conversion to _Atomic(T) from either T or a class type derived
4793 // from T, initialize the T object then convert to _Atomic type.
4794 bool NeedAtomicConversion = false;
4795 if (const AtomicType *Atomic = DestType->getAs<AtomicType>()) {
4796 if (Context.hasSameUnqualifiedType(SourceType, Atomic->getValueType()) ||
4797 S.IsDerivedFrom(SourceType, Atomic->getValueType())) {
4798 DestType = Atomic->getValueType();
4799 NeedAtomicConversion = true;
4803 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
4804 TopLevelOfInitList);
4805 MaybeProduceObjCObject(S, *this, Entity);
4806 if (!Failed() && NeedAtomicConversion)
4807 AddAtomicConversionStep(Entity.getType());
4811 // - Otherwise, the initial value of the object being initialized is the
4812 // (possibly converted) value of the initializer expression. Standard
4813 // conversions (Clause 4) will be used, if necessary, to convert the
4814 // initializer expression to the cv-unqualified version of the
4815 // destination type; no user-defined conversions are considered.
4817 ImplicitConversionSequence ICS
4818 = S.TryImplicitConversion(Initializer, DestType,
4819 /*SuppressUserConversions*/true,
4820 /*AllowExplicitConversions*/ false,
4821 /*InOverloadResolution*/ false,
4822 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
4823 allowObjCWritebackConversion);
4825 if (ICS.isStandard() &&
4826 ICS.Standard.Second == ICK_Writeback_Conversion) {
4827 // Objective-C ARC writeback conversion.
4829 // We should copy unless we're passing to an argument explicitly
4831 bool ShouldCopy = true;
4832 if (ParmVarDecl *Param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
4833 ShouldCopy = (Param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
4835 // If there was an lvalue adjustment, add it as a separate conversion.
4836 if (ICS.Standard.First == ICK_Array_To_Pointer ||
4837 ICS.Standard.First == ICK_Lvalue_To_Rvalue) {
4838 ImplicitConversionSequence LvalueICS;
4839 LvalueICS.setStandard();
4840 LvalueICS.Standard.setAsIdentityConversion();
4841 LvalueICS.Standard.setAllToTypes(ICS.Standard.getToType(0));
4842 LvalueICS.Standard.First = ICS.Standard.First;
4843 AddConversionSequenceStep(LvalueICS, ICS.Standard.getToType(0));
4846 AddPassByIndirectCopyRestoreStep(DestType, ShouldCopy);
4847 } else if (ICS.isBad()) {
4849 if (isLibstdcxxPointerReturnFalseHack(S, Entity, Initializer)) {
4850 AddZeroInitializationStep(Entity.getType());
4851 } else if (Initializer->getType() == Context.OverloadTy &&
4852 !S.ResolveAddressOfOverloadedFunction(Initializer, DestType,
4854 SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4856 SetFailed(InitializationSequence::FK_ConversionFailed);
4858 AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
4860 MaybeProduceObjCObject(S, *this, Entity);
4864 InitializationSequence::~InitializationSequence() {
4865 for (SmallVectorImpl<Step>::iterator Step = Steps.begin(),
4866 StepEnd = Steps.end();
4867 Step != StepEnd; ++Step)
4871 //===----------------------------------------------------------------------===//
4872 // Perform initialization
4873 //===----------------------------------------------------------------------===//
4874 static Sema::AssignmentAction
4875 getAssignmentAction(const InitializedEntity &Entity, bool Diagnose = false) {
4876 switch(Entity.getKind()) {
4877 case InitializedEntity::EK_Variable:
4878 case InitializedEntity::EK_New:
4879 case InitializedEntity::EK_Exception:
4880 case InitializedEntity::EK_Base:
4881 case InitializedEntity::EK_Delegating:
4882 return Sema::AA_Initializing;
4884 case InitializedEntity::EK_Parameter:
4885 if (Entity.getDecl() &&
4886 isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
4887 return Sema::AA_Sending;
4889 return Sema::AA_Passing;
4891 case InitializedEntity::EK_Parameter_CF_Audited:
4892 if (Entity.getDecl() &&
4893 isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
4894 return Sema::AA_Sending;
4896 return !Diagnose ? Sema::AA_Passing : Sema::AA_Passing_CFAudited;
4898 case InitializedEntity::EK_Result:
4899 return Sema::AA_Returning;
4901 case InitializedEntity::EK_Temporary:
4902 case InitializedEntity::EK_RelatedResult:
4903 // FIXME: Can we tell apart casting vs. converting?
4904 return Sema::AA_Casting;
4906 case InitializedEntity::EK_Member:
4907 case InitializedEntity::EK_ArrayElement:
4908 case InitializedEntity::EK_VectorElement:
4909 case InitializedEntity::EK_ComplexElement:
4910 case InitializedEntity::EK_BlockElement:
4911 case InitializedEntity::EK_LambdaCapture:
4912 case InitializedEntity::EK_CompoundLiteralInit:
4913 return Sema::AA_Initializing;
4916 llvm_unreachable("Invalid EntityKind!");
4919 /// \brief Whether we should bind a created object as a temporary when
4920 /// initializing the given entity.
4921 static bool shouldBindAsTemporary(const InitializedEntity &Entity) {
4922 switch (Entity.getKind()) {
4923 case InitializedEntity::EK_ArrayElement:
4924 case InitializedEntity::EK_Member:
4925 case InitializedEntity::EK_Result:
4926 case InitializedEntity::EK_New:
4927 case InitializedEntity::EK_Variable:
4928 case InitializedEntity::EK_Base:
4929 case InitializedEntity::EK_Delegating:
4930 case InitializedEntity::EK_VectorElement:
4931 case InitializedEntity::EK_ComplexElement:
4932 case InitializedEntity::EK_Exception:
4933 case InitializedEntity::EK_BlockElement:
4934 case InitializedEntity::EK_LambdaCapture:
4935 case InitializedEntity::EK_CompoundLiteralInit:
4938 case InitializedEntity::EK_Parameter:
4939 case InitializedEntity::EK_Parameter_CF_Audited:
4940 case InitializedEntity::EK_Temporary:
4941 case InitializedEntity::EK_RelatedResult:
4945 llvm_unreachable("missed an InitializedEntity kind?");
4948 /// \brief Whether the given entity, when initialized with an object
4949 /// created for that initialization, requires destruction.
4950 static bool shouldDestroyTemporary(const InitializedEntity &Entity) {
4951 switch (Entity.getKind()) {
4952 case InitializedEntity::EK_Result:
4953 case InitializedEntity::EK_New:
4954 case InitializedEntity::EK_Base:
4955 case InitializedEntity::EK_Delegating:
4956 case InitializedEntity::EK_VectorElement:
4957 case InitializedEntity::EK_ComplexElement:
4958 case InitializedEntity::EK_BlockElement:
4959 case InitializedEntity::EK_LambdaCapture:
4962 case InitializedEntity::EK_Member:
4963 case InitializedEntity::EK_Variable:
4964 case InitializedEntity::EK_Parameter:
4965 case InitializedEntity::EK_Parameter_CF_Audited:
4966 case InitializedEntity::EK_Temporary:
4967 case InitializedEntity::EK_ArrayElement:
4968 case InitializedEntity::EK_Exception:
4969 case InitializedEntity::EK_CompoundLiteralInit:
4970 case InitializedEntity::EK_RelatedResult:
4974 llvm_unreachable("missed an InitializedEntity kind?");
4977 /// \brief Look for copy and move constructors and constructor templates, for
4978 /// copying an object via direct-initialization (per C++11 [dcl.init]p16).
4979 static void LookupCopyAndMoveConstructors(Sema &S,
4980 OverloadCandidateSet &CandidateSet,
4981 CXXRecordDecl *Class,
4982 Expr *CurInitExpr) {
4983 DeclContext::lookup_result R = S.LookupConstructors(Class);
4984 // The container holding the constructors can under certain conditions
4985 // be changed while iterating (e.g. because of deserialization).
4986 // To be safe we copy the lookup results to a new container.
4987 SmallVector<NamedDecl*, 16> Ctors(R.begin(), R.end());
4988 for (SmallVectorImpl<NamedDecl *>::iterator
4989 CI = Ctors.begin(), CE = Ctors.end(); CI != CE; ++CI) {
4991 CXXConstructorDecl *Constructor = nullptr;
4993 if ((Constructor = dyn_cast<CXXConstructorDecl>(D))) {
4994 // Handle copy/moveconstructors, only.
4995 if (!Constructor || Constructor->isInvalidDecl() ||
4996 !Constructor->isCopyOrMoveConstructor() ||
4997 !Constructor->isConvertingConstructor(/*AllowExplicit=*/true))
5000 DeclAccessPair FoundDecl
5001 = DeclAccessPair::make(Constructor, Constructor->getAccess());
5002 S.AddOverloadCandidate(Constructor, FoundDecl,
5003 CurInitExpr, CandidateSet);
5007 // Handle constructor templates.
5008 FunctionTemplateDecl *ConstructorTmpl = cast<FunctionTemplateDecl>(D);
5009 if (ConstructorTmpl->isInvalidDecl())
5012 Constructor = cast<CXXConstructorDecl>(
5013 ConstructorTmpl->getTemplatedDecl());
5014 if (!Constructor->isConvertingConstructor(/*AllowExplicit=*/true))
5017 // FIXME: Do we need to limit this to copy-constructor-like
5019 DeclAccessPair FoundDecl
5020 = DeclAccessPair::make(ConstructorTmpl, ConstructorTmpl->getAccess());
5021 S.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, nullptr,
5022 CurInitExpr, CandidateSet, true);
5026 /// \brief Get the location at which initialization diagnostics should appear.
5027 static SourceLocation getInitializationLoc(const InitializedEntity &Entity,
5028 Expr *Initializer) {
5029 switch (Entity.getKind()) {
5030 case InitializedEntity::EK_Result:
5031 return Entity.getReturnLoc();
5033 case InitializedEntity::EK_Exception:
5034 return Entity.getThrowLoc();
5036 case InitializedEntity::EK_Variable:
5037 return Entity.getDecl()->getLocation();
5039 case InitializedEntity::EK_LambdaCapture:
5040 return Entity.getCaptureLoc();
5042 case InitializedEntity::EK_ArrayElement:
5043 case InitializedEntity::EK_Member:
5044 case InitializedEntity::EK_Parameter:
5045 case InitializedEntity::EK_Parameter_CF_Audited:
5046 case InitializedEntity::EK_Temporary:
5047 case InitializedEntity::EK_New:
5048 case InitializedEntity::EK_Base:
5049 case InitializedEntity::EK_Delegating:
5050 case InitializedEntity::EK_VectorElement:
5051 case InitializedEntity::EK_ComplexElement:
5052 case InitializedEntity::EK_BlockElement:
5053 case InitializedEntity::EK_CompoundLiteralInit:
5054 case InitializedEntity::EK_RelatedResult:
5055 return Initializer->getLocStart();
5057 llvm_unreachable("missed an InitializedEntity kind?");
5060 /// \brief Make a (potentially elidable) temporary copy of the object
5061 /// provided by the given initializer by calling the appropriate copy
5064 /// \param S The Sema object used for type-checking.
5066 /// \param T The type of the temporary object, which must either be
5067 /// the type of the initializer expression or a superclass thereof.
5069 /// \param Entity The entity being initialized.
5071 /// \param CurInit The initializer expression.
5073 /// \param IsExtraneousCopy Whether this is an "extraneous" copy that
5074 /// is permitted in C++03 (but not C++0x) when binding a reference to
5077 /// \returns An expression that copies the initializer expression into
5078 /// a temporary object, or an error expression if a copy could not be
5080 static ExprResult CopyObject(Sema &S,
5082 const InitializedEntity &Entity,
5084 bool IsExtraneousCopy) {
5085 // Determine which class type we're copying to.
5086 Expr *CurInitExpr = (Expr *)CurInit.get();
5087 CXXRecordDecl *Class = nullptr;
5088 if (const RecordType *Record = T->getAs<RecordType>())
5089 Class = cast<CXXRecordDecl>(Record->getDecl());
5093 // C++0x [class.copy]p32:
5094 // When certain criteria are met, an implementation is allowed to
5095 // omit the copy/move construction of a class object, even if the
5096 // copy/move constructor and/or destructor for the object have
5097 // side effects. [...]
5098 // - when a temporary class object that has not been bound to a
5099 // reference (12.2) would be copied/moved to a class object
5100 // with the same cv-unqualified type, the copy/move operation
5101 // can be omitted by constructing the temporary object
5102 // directly into the target of the omitted copy/move
5104 // Note that the other three bullets are handled elsewhere. Copy
5105 // elision for return statements and throw expressions are handled as part
5106 // of constructor initialization, while copy elision for exception handlers
5107 // is handled by the run-time.
5108 bool Elidable = CurInitExpr->isTemporaryObject(S.Context, Class);
5109 SourceLocation Loc = getInitializationLoc(Entity, CurInit.get());
5111 // Make sure that the type we are copying is complete.
5112 if (S.RequireCompleteType(Loc, T, diag::err_temp_copy_incomplete))
5115 // Perform overload resolution using the class's copy/move constructors.
5116 // Only consider constructors and constructor templates. Per
5117 // C++0x [dcl.init]p16, second bullet to class types, this initialization
5118 // is direct-initialization.
5119 OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
5120 LookupCopyAndMoveConstructors(S, CandidateSet, Class, CurInitExpr);
5122 bool HadMultipleCandidates = (CandidateSet.size() > 1);
5124 OverloadCandidateSet::iterator Best;
5125 switch (CandidateSet.BestViableFunction(S, Loc, Best)) {
5129 case OR_No_Viable_Function:
5130 S.Diag(Loc, IsExtraneousCopy && !S.isSFINAEContext()
5131 ? diag::ext_rvalue_to_reference_temp_copy_no_viable
5132 : diag::err_temp_copy_no_viable)
5133 << (int)Entity.getKind() << CurInitExpr->getType()
5134 << CurInitExpr->getSourceRange();
5135 CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr);
5136 if (!IsExtraneousCopy || S.isSFINAEContext())
5141 S.Diag(Loc, diag::err_temp_copy_ambiguous)
5142 << (int)Entity.getKind() << CurInitExpr->getType()
5143 << CurInitExpr->getSourceRange();
5144 CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr);
5148 S.Diag(Loc, diag::err_temp_copy_deleted)
5149 << (int)Entity.getKind() << CurInitExpr->getType()
5150 << CurInitExpr->getSourceRange();
5151 S.NoteDeletedFunction(Best->Function);
5155 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
5156 SmallVector<Expr*, 8> ConstructorArgs;
5157 CurInit.get(); // Ownership transferred into MultiExprArg, below.
5159 S.CheckConstructorAccess(Loc, Constructor, Entity,
5160 Best->FoundDecl.getAccess(), IsExtraneousCopy);
5162 if (IsExtraneousCopy) {
5163 // If this is a totally extraneous copy for C++03 reference
5164 // binding purposes, just return the original initialization
5165 // expression. We don't generate an (elided) copy operation here
5166 // because doing so would require us to pass down a flag to avoid
5167 // infinite recursion, where each step adds another extraneous,
5170 // Instantiate the default arguments of any extra parameters in
5171 // the selected copy constructor, as if we were going to create a
5172 // proper call to the copy constructor.
5173 for (unsigned I = 1, N = Constructor->getNumParams(); I != N; ++I) {
5174 ParmVarDecl *Parm = Constructor->getParamDecl(I);
5175 if (S.RequireCompleteType(Loc, Parm->getType(),
5176 diag::err_call_incomplete_argument))
5179 // Build the default argument expression; we don't actually care
5180 // if this succeeds or not, because this routine will complain
5181 // if there was a problem.
5182 S.BuildCXXDefaultArgExpr(Loc, Constructor, Parm);
5188 // Determine the arguments required to actually perform the
5189 // constructor call (we might have derived-to-base conversions, or
5190 // the copy constructor may have default arguments).
5191 if (S.CompleteConstructorCall(Constructor, CurInitExpr, Loc, ConstructorArgs))
5194 // Actually perform the constructor call.
5195 CurInit = S.BuildCXXConstructExpr(Loc, T, Constructor, Elidable,
5197 HadMultipleCandidates,
5199 /*StdInitListInit*/ false,
5201 CXXConstructExpr::CK_Complete,
5204 // If we're supposed to bind temporaries, do so.
5205 if (!CurInit.isInvalid() && shouldBindAsTemporary(Entity))
5206 CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
5210 /// \brief Check whether elidable copy construction for binding a reference to
5211 /// a temporary would have succeeded if we were building in C++98 mode, for
5213 static void CheckCXX98CompatAccessibleCopy(Sema &S,
5214 const InitializedEntity &Entity,
5215 Expr *CurInitExpr) {
5216 assert(S.getLangOpts().CPlusPlus11);
5218 const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>();
5222 SourceLocation Loc = getInitializationLoc(Entity, CurInitExpr);
5223 if (S.Diags.isIgnored(diag::warn_cxx98_compat_temp_copy, Loc))
5226 // Find constructors which would have been considered.
5227 OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
5228 LookupCopyAndMoveConstructors(
5229 S, CandidateSet, cast<CXXRecordDecl>(Record->getDecl()), CurInitExpr);
5231 // Perform overload resolution.
5232 OverloadCandidateSet::iterator Best;
5233 OverloadingResult OR = CandidateSet.BestViableFunction(S, Loc, Best);
5235 PartialDiagnostic Diag = S.PDiag(diag::warn_cxx98_compat_temp_copy)
5236 << OR << (int)Entity.getKind() << CurInitExpr->getType()
5237 << CurInitExpr->getSourceRange();
5241 S.CheckConstructorAccess(Loc, cast<CXXConstructorDecl>(Best->Function),
5242 Entity, Best->FoundDecl.getAccess(), Diag);
5243 // FIXME: Check default arguments as far as that's possible.
5246 case OR_No_Viable_Function:
5248 CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr);
5253 CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr);
5258 S.NoteDeletedFunction(Best->Function);
5263 void InitializationSequence::PrintInitLocationNote(Sema &S,
5264 const InitializedEntity &Entity) {
5265 if (Entity.isParameterKind() && Entity.getDecl()) {
5266 if (Entity.getDecl()->getLocation().isInvalid())
5269 if (Entity.getDecl()->getDeclName())
5270 S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_named_here)
5271 << Entity.getDecl()->getDeclName();
5273 S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_here);
5275 else if (Entity.getKind() == InitializedEntity::EK_RelatedResult &&
5276 Entity.getMethodDecl())
5277 S.Diag(Entity.getMethodDecl()->getLocation(),
5278 diag::note_method_return_type_change)
5279 << Entity.getMethodDecl()->getDeclName();
5282 static bool isReferenceBinding(const InitializationSequence::Step &s) {
5283 return s.Kind == InitializationSequence::SK_BindReference ||
5284 s.Kind == InitializationSequence::SK_BindReferenceToTemporary;
5287 /// Returns true if the parameters describe a constructor initialization of
5288 /// an explicit temporary object, e.g. "Point(x, y)".
5289 static bool isExplicitTemporary(const InitializedEntity &Entity,
5290 const InitializationKind &Kind,
5292 switch (Entity.getKind()) {
5293 case InitializedEntity::EK_Temporary:
5294 case InitializedEntity::EK_CompoundLiteralInit:
5295 case InitializedEntity::EK_RelatedResult:
5301 switch (Kind.getKind()) {
5302 case InitializationKind::IK_DirectList:
5304 // FIXME: Hack to work around cast weirdness.
5305 case InitializationKind::IK_Direct:
5306 case InitializationKind::IK_Value:
5307 return NumArgs != 1;
5314 PerformConstructorInitialization(Sema &S,
5315 const InitializedEntity &Entity,
5316 const InitializationKind &Kind,
5318 const InitializationSequence::Step& Step,
5319 bool &ConstructorInitRequiresZeroInit,
5320 bool IsListInitialization,
5321 bool IsStdInitListInitialization,
5322 SourceLocation LBraceLoc,
5323 SourceLocation RBraceLoc) {
5324 unsigned NumArgs = Args.size();
5325 CXXConstructorDecl *Constructor
5326 = cast<CXXConstructorDecl>(Step.Function.Function);
5327 bool HadMultipleCandidates = Step.Function.HadMultipleCandidates;
5329 // Build a call to the selected constructor.
5330 SmallVector<Expr*, 8> ConstructorArgs;
5331 SourceLocation Loc = (Kind.isCopyInit() && Kind.getEqualLoc().isValid())
5332 ? Kind.getEqualLoc()
5333 : Kind.getLocation();
5335 if (Kind.getKind() == InitializationKind::IK_Default) {
5336 // Force even a trivial, implicit default constructor to be
5337 // semantically checked. We do this explicitly because we don't build
5338 // the definition for completely trivial constructors.
5339 assert(Constructor->getParent() && "No parent class for constructor.");
5340 if (Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
5341 Constructor->isTrivial() && !Constructor->isUsed(false))
5342 S.DefineImplicitDefaultConstructor(Loc, Constructor);
5345 ExprResult CurInit((Expr *)nullptr);
5347 // C++ [over.match.copy]p1:
5348 // - When initializing a temporary to be bound to the first parameter
5349 // of a constructor that takes a reference to possibly cv-qualified
5350 // T as its first argument, called with a single argument in the
5351 // context of direct-initialization, explicit conversion functions
5352 // are also considered.
5353 bool AllowExplicitConv = Kind.AllowExplicit() && !Kind.isCopyInit() &&
5355 Constructor->isCopyOrMoveConstructor();
5357 // Determine the arguments required to actually perform the constructor
5359 if (S.CompleteConstructorCall(Constructor, Args,
5360 Loc, ConstructorArgs,
5362 IsListInitialization))
5366 if (isExplicitTemporary(Entity, Kind, NumArgs)) {
5367 // An explicitly-constructed temporary, e.g., X(1, 2).
5368 S.MarkFunctionReferenced(Loc, Constructor);
5369 if (S.DiagnoseUseOfDecl(Constructor, Loc))
5372 TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
5374 TSInfo = S.Context.getTrivialTypeSourceInfo(Entity.getType(), Loc);
5375 SourceRange ParenOrBraceRange =
5376 (Kind.getKind() == InitializationKind::IK_DirectList)
5377 ? SourceRange(LBraceLoc, RBraceLoc)
5378 : Kind.getParenRange();
5380 CurInit = new (S.Context) CXXTemporaryObjectExpr(
5381 S.Context, Constructor, TSInfo, ConstructorArgs, ParenOrBraceRange,
5382 HadMultipleCandidates, IsListInitialization,
5383 IsStdInitListInitialization, ConstructorInitRequiresZeroInit);
5385 CXXConstructExpr::ConstructionKind ConstructKind =
5386 CXXConstructExpr::CK_Complete;
5388 if (Entity.getKind() == InitializedEntity::EK_Base) {
5389 ConstructKind = Entity.getBaseSpecifier()->isVirtual() ?
5390 CXXConstructExpr::CK_VirtualBase :
5391 CXXConstructExpr::CK_NonVirtualBase;
5392 } else if (Entity.getKind() == InitializedEntity::EK_Delegating) {
5393 ConstructKind = CXXConstructExpr::CK_Delegating;
5396 // Only get the parenthesis or brace range if it is a list initialization or
5397 // direct construction.
5398 SourceRange ParenOrBraceRange;
5399 if (IsListInitialization)
5400 ParenOrBraceRange = SourceRange(LBraceLoc, RBraceLoc);
5401 else if (Kind.getKind() == InitializationKind::IK_Direct)
5402 ParenOrBraceRange = Kind.getParenRange();
5404 // If the entity allows NRVO, mark the construction as elidable
5406 if (Entity.allowsNRVO())
5407 CurInit = S.BuildCXXConstructExpr(Loc, Entity.getType(),
5408 Constructor, /*Elidable=*/true,
5410 HadMultipleCandidates,
5411 IsListInitialization,
5412 IsStdInitListInitialization,
5413 ConstructorInitRequiresZeroInit,
5417 CurInit = S.BuildCXXConstructExpr(Loc, Entity.getType(),
5420 HadMultipleCandidates,
5421 IsListInitialization,
5422 IsStdInitListInitialization,
5423 ConstructorInitRequiresZeroInit,
5427 if (CurInit.isInvalid())
5430 // Only check access if all of that succeeded.
5431 S.CheckConstructorAccess(Loc, Constructor, Entity,
5432 Step.Function.FoundDecl.getAccess());
5433 if (S.DiagnoseUseOfDecl(Step.Function.FoundDecl, Loc))
5436 if (shouldBindAsTemporary(Entity))
5437 CurInit = S.MaybeBindToTemporary(CurInit.get());
5442 /// Determine whether the specified InitializedEntity definitely has a lifetime
5443 /// longer than the current full-expression. Conservatively returns false if
5446 InitializedEntityOutlivesFullExpression(const InitializedEntity &Entity) {
5447 const InitializedEntity *Top = &Entity;
5448 while (Top->getParent())
5449 Top = Top->getParent();
5451 switch (Top->getKind()) {
5452 case InitializedEntity::EK_Variable:
5453 case InitializedEntity::EK_Result:
5454 case InitializedEntity::EK_Exception:
5455 case InitializedEntity::EK_Member:
5456 case InitializedEntity::EK_New:
5457 case InitializedEntity::EK_Base:
5458 case InitializedEntity::EK_Delegating:
5461 case InitializedEntity::EK_ArrayElement:
5462 case InitializedEntity::EK_VectorElement:
5463 case InitializedEntity::EK_BlockElement:
5464 case InitializedEntity::EK_ComplexElement:
5465 // Could not determine what the full initialization is. Assume it might not
5466 // outlive the full-expression.
5469 case InitializedEntity::EK_Parameter:
5470 case InitializedEntity::EK_Parameter_CF_Audited:
5471 case InitializedEntity::EK_Temporary:
5472 case InitializedEntity::EK_LambdaCapture:
5473 case InitializedEntity::EK_CompoundLiteralInit:
5474 case InitializedEntity::EK_RelatedResult:
5475 // The entity being initialized might not outlive the full-expression.
5479 llvm_unreachable("unknown entity kind");
5482 /// Determine the declaration which an initialized entity ultimately refers to,
5483 /// for the purpose of lifetime-extending a temporary bound to a reference in
5484 /// the initialization of \p Entity.
5485 static const InitializedEntity *getEntityForTemporaryLifetimeExtension(
5486 const InitializedEntity *Entity,
5487 const InitializedEntity *FallbackDecl = nullptr) {
5488 // C++11 [class.temporary]p5:
5489 switch (Entity->getKind()) {
5490 case InitializedEntity::EK_Variable:
5491 // The temporary [...] persists for the lifetime of the reference
5494 case InitializedEntity::EK_Member:
5495 // For subobjects, we look at the complete object.
5496 if (Entity->getParent())
5497 return getEntityForTemporaryLifetimeExtension(Entity->getParent(),
5501 // -- A temporary bound to a reference member in a constructor's
5502 // ctor-initializer persists until the constructor exits.
5505 case InitializedEntity::EK_Parameter:
5506 case InitializedEntity::EK_Parameter_CF_Audited:
5507 // -- A temporary bound to a reference parameter in a function call
5508 // persists until the completion of the full-expression containing
5510 case InitializedEntity::EK_Result:
5511 // -- The lifetime of a temporary bound to the returned value in a
5512 // function return statement is not extended; the temporary is
5513 // destroyed at the end of the full-expression in the return statement.
5514 case InitializedEntity::EK_New:
5515 // -- A temporary bound to a reference in a new-initializer persists
5516 // until the completion of the full-expression containing the
5520 case InitializedEntity::EK_Temporary:
5521 case InitializedEntity::EK_CompoundLiteralInit:
5522 case InitializedEntity::EK_RelatedResult:
5523 // We don't yet know the storage duration of the surrounding temporary.
5524 // Assume it's got full-expression duration for now, it will patch up our
5525 // storage duration if that's not correct.
5528 case InitializedEntity::EK_ArrayElement:
5529 // For subobjects, we look at the complete object.
5530 return getEntityForTemporaryLifetimeExtension(Entity->getParent(),
5533 case InitializedEntity::EK_Base:
5534 case InitializedEntity::EK_Delegating:
5535 // We can reach this case for aggregate initialization in a constructor:
5536 // struct A { int &&r; };
5537 // struct B : A { B() : A{0} {} };
5538 // In this case, use the innermost field decl as the context.
5539 return FallbackDecl;
5541 case InitializedEntity::EK_BlockElement:
5542 case InitializedEntity::EK_LambdaCapture:
5543 case InitializedEntity::EK_Exception:
5544 case InitializedEntity::EK_VectorElement:
5545 case InitializedEntity::EK_ComplexElement:
5548 llvm_unreachable("unknown entity kind");
5551 static void performLifetimeExtension(Expr *Init,
5552 const InitializedEntity *ExtendingEntity);
5554 /// Update a glvalue expression that is used as the initializer of a reference
5555 /// to note that its lifetime is extended.
5556 /// \return \c true if any temporary had its lifetime extended.
5558 performReferenceExtension(Expr *Init,
5559 const InitializedEntity *ExtendingEntity) {
5560 // Walk past any constructs which we can lifetime-extend across.
5565 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
5566 if (ILE->getNumInits() == 1 && ILE->isGLValue()) {
5567 // This is just redundant braces around an initializer. Step over it.
5568 Init = ILE->getInit(0);
5572 // Step over any subobject adjustments; we may have a materialized
5573 // temporary inside them.
5574 SmallVector<const Expr *, 2> CommaLHSs;
5575 SmallVector<SubobjectAdjustment, 2> Adjustments;
5576 Init = const_cast<Expr *>(
5577 Init->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments));
5579 // Per current approach for DR1376, look through casts to reference type
5580 // when performing lifetime extension.
5581 if (CastExpr *CE = dyn_cast<CastExpr>(Init))
5582 if (CE->getSubExpr()->isGLValue())
5583 Init = CE->getSubExpr();
5585 // FIXME: Per DR1213, subscripting on an array temporary produces an xvalue.
5586 // It's unclear if binding a reference to that xvalue extends the array
5588 } while (Init != Old);
5590 if (MaterializeTemporaryExpr *ME = dyn_cast<MaterializeTemporaryExpr>(Init)) {
5591 // Update the storage duration of the materialized temporary.
5592 // FIXME: Rebuild the expression instead of mutating it.
5593 ME->setExtendingDecl(ExtendingEntity->getDecl(),
5594 ExtendingEntity->allocateManglingNumber());
5595 performLifetimeExtension(ME->GetTemporaryExpr(), ExtendingEntity);
5602 /// Update a prvalue expression that is going to be materialized as a
5603 /// lifetime-extended temporary.
5604 static void performLifetimeExtension(Expr *Init,
5605 const InitializedEntity *ExtendingEntity) {
5606 // Dig out the expression which constructs the extended temporary.
5607 SmallVector<const Expr *, 2> CommaLHSs;
5608 SmallVector<SubobjectAdjustment, 2> Adjustments;
5609 Init = const_cast<Expr *>(
5610 Init->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments));
5612 if (CXXBindTemporaryExpr *BTE = dyn_cast<CXXBindTemporaryExpr>(Init))
5613 Init = BTE->getSubExpr();
5615 if (CXXStdInitializerListExpr *ILE =
5616 dyn_cast<CXXStdInitializerListExpr>(Init)) {
5617 performReferenceExtension(ILE->getSubExpr(), ExtendingEntity);
5621 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
5622 if (ILE->getType()->isArrayType()) {
5623 for (unsigned I = 0, N = ILE->getNumInits(); I != N; ++I)
5624 performLifetimeExtension(ILE->getInit(I), ExtendingEntity);
5628 if (CXXRecordDecl *RD = ILE->getType()->getAsCXXRecordDecl()) {
5629 assert(RD->isAggregate() && "aggregate init on non-aggregate");
5631 // If we lifetime-extend a braced initializer which is initializing an
5632 // aggregate, and that aggregate contains reference members which are
5633 // bound to temporaries, those temporaries are also lifetime-extended.
5634 if (RD->isUnion() && ILE->getInitializedFieldInUnion() &&
5635 ILE->getInitializedFieldInUnion()->getType()->isReferenceType())
5636 performReferenceExtension(ILE->getInit(0), ExtendingEntity);
5639 for (const auto *I : RD->fields()) {
5640 if (Index >= ILE->getNumInits())
5642 if (I->isUnnamedBitfield())
5644 Expr *SubInit = ILE->getInit(Index);
5645 if (I->getType()->isReferenceType())
5646 performReferenceExtension(SubInit, ExtendingEntity);
5647 else if (isa<InitListExpr>(SubInit) ||
5648 isa<CXXStdInitializerListExpr>(SubInit))
5649 // This may be either aggregate-initialization of a member or
5650 // initialization of a std::initializer_list object. Either way,
5651 // we should recursively lifetime-extend that initializer.
5652 performLifetimeExtension(SubInit, ExtendingEntity);
5660 static void warnOnLifetimeExtension(Sema &S, const InitializedEntity &Entity,
5661 const Expr *Init, bool IsInitializerList,
5662 const ValueDecl *ExtendingDecl) {
5663 // Warn if a field lifetime-extends a temporary.
5664 if (isa<FieldDecl>(ExtendingDecl)) {
5665 if (IsInitializerList) {
5666 S.Diag(Init->getExprLoc(), diag::warn_dangling_std_initializer_list)
5667 << /*at end of constructor*/true;
5671 bool IsSubobjectMember = false;
5672 for (const InitializedEntity *Ent = Entity.getParent(); Ent;
5673 Ent = Ent->getParent()) {
5674 if (Ent->getKind() != InitializedEntity::EK_Base) {
5675 IsSubobjectMember = true;
5679 S.Diag(Init->getExprLoc(),
5680 diag::warn_bind_ref_member_to_temporary)
5681 << ExtendingDecl << Init->getSourceRange()
5682 << IsSubobjectMember << IsInitializerList;
5683 if (IsSubobjectMember)
5684 S.Diag(ExtendingDecl->getLocation(),
5685 diag::note_ref_subobject_of_member_declared_here);
5687 S.Diag(ExtendingDecl->getLocation(),
5688 diag::note_ref_or_ptr_member_declared_here)
5689 << /*is pointer*/false;
5693 static void DiagnoseNarrowingInInitList(Sema &S,
5694 const ImplicitConversionSequence &ICS,
5695 QualType PreNarrowingType,
5696 QualType EntityType,
5697 const Expr *PostInit);
5700 InitializationSequence::Perform(Sema &S,
5701 const InitializedEntity &Entity,
5702 const InitializationKind &Kind,
5704 QualType *ResultType) {
5706 Diagnose(S, Entity, Kind, Args);
5710 if (getKind() == DependentSequence) {
5711 // If the declaration is a non-dependent, incomplete array type
5712 // that has an initializer, then its type will be completed once
5713 // the initializer is instantiated.
5714 if (ResultType && !Entity.getType()->isDependentType() &&
5716 QualType DeclType = Entity.getType();
5717 if (const IncompleteArrayType *ArrayT
5718 = S.Context.getAsIncompleteArrayType(DeclType)) {
5719 // FIXME: We don't currently have the ability to accurately
5720 // compute the length of an initializer list without
5721 // performing full type-checking of the initializer list
5722 // (since we have to determine where braces are implicitly
5723 // introduced and such). So, we fall back to making the array
5724 // type a dependently-sized array type with no specified
5726 if (isa<InitListExpr>((Expr *)Args[0])) {
5727 SourceRange Brackets;
5729 // Scavange the location of the brackets from the entity, if we can.
5730 if (DeclaratorDecl *DD = Entity.getDecl()) {
5731 if (TypeSourceInfo *TInfo = DD->getTypeSourceInfo()) {
5732 TypeLoc TL = TInfo->getTypeLoc();
5733 if (IncompleteArrayTypeLoc ArrayLoc =
5734 TL.getAs<IncompleteArrayTypeLoc>())
5735 Brackets = ArrayLoc.getBracketsRange();
5740 = S.Context.getDependentSizedArrayType(ArrayT->getElementType(),
5741 /*NumElts=*/nullptr,
5742 ArrayT->getSizeModifier(),
5743 ArrayT->getIndexTypeCVRQualifiers(),
5749 if (Kind.getKind() == InitializationKind::IK_Direct &&
5750 !Kind.isExplicitCast()) {
5751 // Rebuild the ParenListExpr.
5752 SourceRange ParenRange = Kind.getParenRange();
5753 return S.ActOnParenListExpr(ParenRange.getBegin(), ParenRange.getEnd(),
5756 assert(Kind.getKind() == InitializationKind::IK_Copy ||
5757 Kind.isExplicitCast() ||
5758 Kind.getKind() == InitializationKind::IK_DirectList);
5759 return ExprResult(Args[0]);
5762 // No steps means no initialization.
5764 return ExprResult((Expr *)nullptr);
5766 if (S.getLangOpts().CPlusPlus11 && Entity.getType()->isReferenceType() &&
5767 Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
5768 !Entity.isParameterKind()) {
5769 // Produce a C++98 compatibility warning if we are initializing a reference
5770 // from an initializer list. For parameters, we produce a better warning
5772 Expr *Init = Args[0];
5773 S.Diag(Init->getLocStart(), diag::warn_cxx98_compat_reference_list_init)
5774 << Init->getSourceRange();
5777 // Diagnose cases where we initialize a pointer to an array temporary, and the
5778 // pointer obviously outlives the temporary.
5779 if (Args.size() == 1 && Args[0]->getType()->isArrayType() &&
5780 Entity.getType()->isPointerType() &&
5781 InitializedEntityOutlivesFullExpression(Entity)) {
5782 Expr *Init = Args[0];
5783 Expr::LValueClassification Kind = Init->ClassifyLValue(S.Context);
5784 if (Kind == Expr::LV_ClassTemporary || Kind == Expr::LV_ArrayTemporary)
5785 S.Diag(Init->getLocStart(), diag::warn_temporary_array_to_pointer_decay)
5786 << Init->getSourceRange();
5789 QualType DestType = Entity.getType().getNonReferenceType();
5790 // FIXME: Ugly hack around the fact that Entity.getType() is not
5791 // the same as Entity.getDecl()->getType() in cases involving type merging,
5792 // and we want latter when it makes sense.
5794 *ResultType = Entity.getDecl() ? Entity.getDecl()->getType() :
5797 ExprResult CurInit((Expr *)nullptr);
5799 // For initialization steps that start with a single initializer,
5800 // grab the only argument out the Args and place it into the "current"
5802 switch (Steps.front().Kind) {
5803 case SK_ResolveAddressOfOverloadedFunction:
5804 case SK_CastDerivedToBaseRValue:
5805 case SK_CastDerivedToBaseXValue:
5806 case SK_CastDerivedToBaseLValue:
5807 case SK_BindReference:
5808 case SK_BindReferenceToTemporary:
5809 case SK_ExtraneousCopyToTemporary:
5810 case SK_UserConversion:
5811 case SK_QualificationConversionLValue:
5812 case SK_QualificationConversionXValue:
5813 case SK_QualificationConversionRValue:
5814 case SK_AtomicConversion:
5815 case SK_LValueToRValue:
5816 case SK_ConversionSequence:
5817 case SK_ConversionSequenceNoNarrowing:
5818 case SK_ListInitialization:
5819 case SK_UnwrapInitList:
5820 case SK_RewrapInitList:
5821 case SK_CAssignment:
5823 case SK_ObjCObjectConversion:
5825 case SK_ParenthesizedArrayInit:
5826 case SK_PassByIndirectCopyRestore:
5827 case SK_PassByIndirectRestore:
5828 case SK_ProduceObjCObject:
5829 case SK_StdInitializerList:
5830 case SK_OCLSamplerInit:
5831 case SK_OCLZeroEvent: {
5832 assert(Args.size() == 1);
5834 if (!CurInit.get()) return ExprError();
5838 case SK_ConstructorInitialization:
5839 case SK_ConstructorInitializationFromList:
5840 case SK_StdInitializerListConstructorCall:
5841 case SK_ZeroInitialization:
5845 // Walk through the computed steps for the initialization sequence,
5846 // performing the specified conversions along the way.
5847 bool ConstructorInitRequiresZeroInit = false;
5848 for (step_iterator Step = step_begin(), StepEnd = step_end();
5849 Step != StepEnd; ++Step) {
5850 if (CurInit.isInvalid())
5853 QualType SourceType = CurInit.get() ? CurInit.get()->getType() : QualType();
5855 switch (Step->Kind) {
5856 case SK_ResolveAddressOfOverloadedFunction:
5857 // Overload resolution determined which function invoke; update the
5858 // initializer to reflect that choice.
5859 S.CheckAddressOfMemberAccess(CurInit.get(), Step->Function.FoundDecl);
5860 if (S.DiagnoseUseOfDecl(Step->Function.FoundDecl, Kind.getLocation()))
5862 CurInit = S.FixOverloadedFunctionReference(CurInit,
5863 Step->Function.FoundDecl,
5864 Step->Function.Function);
5867 case SK_CastDerivedToBaseRValue:
5868 case SK_CastDerivedToBaseXValue:
5869 case SK_CastDerivedToBaseLValue: {
5870 // We have a derived-to-base cast that produces either an rvalue or an
5871 // lvalue. Perform that cast.
5873 CXXCastPath BasePath;
5875 // Casts to inaccessible base classes are allowed with C-style casts.
5876 bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast();
5877 if (S.CheckDerivedToBaseConversion(SourceType, Step->Type,
5878 CurInit.get()->getLocStart(),
5879 CurInit.get()->getSourceRange(),
5880 &BasePath, IgnoreBaseAccess))
5884 Step->Kind == SK_CastDerivedToBaseLValue ?
5886 (Step->Kind == SK_CastDerivedToBaseXValue ?
5890 ImplicitCastExpr::Create(S.Context, Step->Type, CK_DerivedToBase,
5891 CurInit.get(), &BasePath, VK);
5895 case SK_BindReference:
5896 // References cannot bind to bit-fields (C++ [dcl.init.ref]p5).
5897 if (CurInit.get()->refersToBitField()) {
5898 // We don't necessarily have an unambiguous source bit-field.
5899 FieldDecl *BitField = CurInit.get()->getSourceBitField();
5900 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
5901 << Entity.getType().isVolatileQualified()
5902 << (BitField ? BitField->getDeclName() : DeclarationName())
5903 << (BitField != nullptr)
5904 << CurInit.get()->getSourceRange();
5906 S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
5911 if (CurInit.get()->refersToVectorElement()) {
5912 // References cannot bind to vector elements.
5913 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_vector_element)
5914 << Entity.getType().isVolatileQualified()
5915 << CurInit.get()->getSourceRange();
5916 PrintInitLocationNote(S, Entity);
5920 // Reference binding does not have any corresponding ASTs.
5922 // Check exception specifications
5923 if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
5926 // Even though we didn't materialize a temporary, the binding may still
5927 // extend the lifetime of a temporary. This happens if we bind a reference
5928 // to the result of a cast to reference type.
5929 if (const InitializedEntity *ExtendingEntity =
5930 getEntityForTemporaryLifetimeExtension(&Entity))
5931 if (performReferenceExtension(CurInit.get(), ExtendingEntity))
5932 warnOnLifetimeExtension(S, Entity, CurInit.get(),
5933 /*IsInitializerList=*/false,
5934 ExtendingEntity->getDecl());
5938 case SK_BindReferenceToTemporary: {
5939 // Make sure the "temporary" is actually an rvalue.
5940 assert(CurInit.get()->isRValue() && "not a temporary");
5942 // Check exception specifications
5943 if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
5946 // Materialize the temporary into memory.
5947 MaterializeTemporaryExpr *MTE = new (S.Context) MaterializeTemporaryExpr(
5948 Entity.getType().getNonReferenceType(), CurInit.get(),
5949 Entity.getType()->isLValueReferenceType());
5951 // Maybe lifetime-extend the temporary's subobjects to match the
5952 // entity's lifetime.
5953 if (const InitializedEntity *ExtendingEntity =
5954 getEntityForTemporaryLifetimeExtension(&Entity))
5955 if (performReferenceExtension(MTE, ExtendingEntity))
5956 warnOnLifetimeExtension(S, Entity, CurInit.get(), /*IsInitializerList=*/false,
5957 ExtendingEntity->getDecl());
5959 // If we're binding to an Objective-C object that has lifetime, we
5960 // need cleanups. Likewise if we're extending this temporary to automatic
5961 // storage duration -- we need to register its cleanup during the
5962 // full-expression's cleanups.
5963 if ((S.getLangOpts().ObjCAutoRefCount &&
5964 MTE->getType()->isObjCLifetimeType()) ||
5965 (MTE->getStorageDuration() == SD_Automatic &&
5966 MTE->getType().isDestructedType()))
5967 S.ExprNeedsCleanups = true;
5973 case SK_ExtraneousCopyToTemporary:
5974 CurInit = CopyObject(S, Step->Type, Entity, CurInit,
5975 /*IsExtraneousCopy=*/true);
5978 case SK_UserConversion: {
5979 // We have a user-defined conversion that invokes either a constructor
5980 // or a conversion function.
5982 bool IsCopy = false;
5983 FunctionDecl *Fn = Step->Function.Function;
5984 DeclAccessPair FoundFn = Step->Function.FoundDecl;
5985 bool HadMultipleCandidates = Step->Function.HadMultipleCandidates;
5986 bool CreatedObject = false;
5987 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Fn)) {
5988 // Build a call to the selected constructor.
5989 SmallVector<Expr*, 8> ConstructorArgs;
5990 SourceLocation Loc = CurInit.get()->getLocStart();
5991 CurInit.get(); // Ownership transferred into MultiExprArg, below.
5993 // Determine the arguments required to actually perform the constructor
5995 Expr *Arg = CurInit.get();
5996 if (S.CompleteConstructorCall(Constructor,
5997 MultiExprArg(&Arg, 1),
5998 Loc, ConstructorArgs))
6001 // Build an expression that constructs a temporary.
6002 CurInit = S.BuildCXXConstructExpr(Loc, Step->Type, Constructor,
6004 HadMultipleCandidates,
6006 /*StdInitListInit*/ false,
6008 CXXConstructExpr::CK_Complete,
6010 if (CurInit.isInvalid())
6013 S.CheckConstructorAccess(Kind.getLocation(), Constructor, Entity,
6014 FoundFn.getAccess());
6015 if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
6018 CastKind = CK_ConstructorConversion;
6019 QualType Class = S.Context.getTypeDeclType(Constructor->getParent());
6020 if (S.Context.hasSameUnqualifiedType(SourceType, Class) ||
6021 S.IsDerivedFrom(SourceType, Class))
6024 CreatedObject = true;
6026 // Build a call to the conversion function.
6027 CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Fn);
6028 S.CheckMemberOperatorAccess(Kind.getLocation(), CurInit.get(), nullptr,
6030 if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
6033 // FIXME: Should we move this initialization into a separate
6034 // derived-to-base conversion? I believe the answer is "no", because
6035 // we don't want to turn off access control here for c-style casts.
6036 ExprResult CurInitExprRes =
6037 S.PerformObjectArgumentInitialization(CurInit.get(),
6038 /*Qualifier=*/nullptr,
6039 FoundFn, Conversion);
6040 if(CurInitExprRes.isInvalid())
6042 CurInit = CurInitExprRes;
6044 // Build the actual call to the conversion function.
6045 CurInit = S.BuildCXXMemberCallExpr(CurInit.get(), FoundFn, Conversion,
6046 HadMultipleCandidates);
6047 if (CurInit.isInvalid() || !CurInit.get())
6050 CastKind = CK_UserDefinedConversion;
6052 CreatedObject = Conversion->getReturnType()->isRecordType();
6055 bool RequiresCopy = !IsCopy && !isReferenceBinding(Steps.back());
6056 bool MaybeBindToTemp = RequiresCopy || shouldBindAsTemporary(Entity);
6058 if (!MaybeBindToTemp && CreatedObject && shouldDestroyTemporary(Entity)) {
6059 QualType T = CurInit.get()->getType();
6060 if (const RecordType *Record = T->getAs<RecordType>()) {
6061 CXXDestructorDecl *Destructor
6062 = S.LookupDestructor(cast<CXXRecordDecl>(Record->getDecl()));
6063 S.CheckDestructorAccess(CurInit.get()->getLocStart(), Destructor,
6064 S.PDiag(diag::err_access_dtor_temp) << T);
6065 S.MarkFunctionReferenced(CurInit.get()->getLocStart(), Destructor);
6066 if (S.DiagnoseUseOfDecl(Destructor, CurInit.get()->getLocStart()))
6071 CurInit = ImplicitCastExpr::Create(S.Context, CurInit.get()->getType(),
6072 CastKind, CurInit.get(), nullptr,
6073 CurInit.get()->getValueKind());
6074 if (MaybeBindToTemp)
6075 CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
6077 CurInit = CopyObject(S, Entity.getType().getNonReferenceType(), Entity,
6078 CurInit, /*IsExtraneousCopy=*/false);
6082 case SK_QualificationConversionLValue:
6083 case SK_QualificationConversionXValue:
6084 case SK_QualificationConversionRValue: {
6085 // Perform a qualification conversion; these can never go wrong.
6087 Step->Kind == SK_QualificationConversionLValue ?
6089 (Step->Kind == SK_QualificationConversionXValue ?
6092 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type, CK_NoOp, VK);
6096 case SK_AtomicConversion: {
6097 assert(CurInit.get()->isRValue() && "cannot convert glvalue to atomic");
6098 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
6099 CK_NonAtomicToAtomic, VK_RValue);
6103 case SK_LValueToRValue: {
6104 assert(CurInit.get()->isGLValue() && "cannot load from a prvalue");
6105 CurInit = ImplicitCastExpr::Create(S.Context, Step->Type,
6106 CK_LValueToRValue, CurInit.get(),
6107 /*BasePath=*/nullptr, VK_RValue);
6111 case SK_ConversionSequence:
6112 case SK_ConversionSequenceNoNarrowing: {
6113 Sema::CheckedConversionKind CCK
6114 = Kind.isCStyleCast()? Sema::CCK_CStyleCast
6115 : Kind.isFunctionalCast()? Sema::CCK_FunctionalCast
6116 : Kind.isExplicitCast()? Sema::CCK_OtherCast
6117 : Sema::CCK_ImplicitConversion;
6118 ExprResult CurInitExprRes =
6119 S.PerformImplicitConversion(CurInit.get(), Step->Type, *Step->ICS,
6120 getAssignmentAction(Entity), CCK);
6121 if (CurInitExprRes.isInvalid())
6123 CurInit = CurInitExprRes;
6125 if (Step->Kind == SK_ConversionSequenceNoNarrowing &&
6126 S.getLangOpts().CPlusPlus && !CurInit.get()->isValueDependent())
6127 DiagnoseNarrowingInInitList(S, *Step->ICS, SourceType, Entity.getType(),
6132 case SK_ListInitialization: {
6133 InitListExpr *InitList = cast<InitListExpr>(CurInit.get());
6134 // If we're not initializing the top-level entity, we need to create an
6135 // InitializeTemporary entity for our target type.
6136 QualType Ty = Step->Type;
6137 bool IsTemporary = !S.Context.hasSameType(Entity.getType(), Ty);
6138 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(Ty);
6139 InitializedEntity InitEntity = IsTemporary ? TempEntity : Entity;
6140 InitListChecker PerformInitList(S, InitEntity,
6141 InitList, Ty, /*VerifyOnly=*/false);
6142 if (PerformInitList.HadError())
6145 // Hack: We must update *ResultType if available in order to set the
6146 // bounds of arrays, e.g. in 'int ar[] = {1, 2, 3};'.
6147 // Worst case: 'const int (&arref)[] = {1, 2, 3};'.
6149 ResultType->getNonReferenceType()->isIncompleteArrayType()) {
6150 if ((*ResultType)->isRValueReferenceType())
6151 Ty = S.Context.getRValueReferenceType(Ty);
6152 else if ((*ResultType)->isLValueReferenceType())
6153 Ty = S.Context.getLValueReferenceType(Ty,
6154 (*ResultType)->getAs<LValueReferenceType>()->isSpelledAsLValue());
6158 InitListExpr *StructuredInitList =
6159 PerformInitList.getFullyStructuredList();
6161 CurInit = shouldBindAsTemporary(InitEntity)
6162 ? S.MaybeBindToTemporary(StructuredInitList)
6163 : StructuredInitList;
6167 case SK_ConstructorInitializationFromList: {
6168 // When an initializer list is passed for a parameter of type "reference
6169 // to object", we don't get an EK_Temporary entity, but instead an
6170 // EK_Parameter entity with reference type.
6171 // FIXME: This is a hack. What we really should do is create a user
6172 // conversion step for this case, but this makes it considerably more
6173 // complicated. For now, this will do.
6174 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
6175 Entity.getType().getNonReferenceType());
6176 bool UseTemporary = Entity.getType()->isReferenceType();
6177 assert(Args.size() == 1 && "expected a single argument for list init");
6178 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
6179 S.Diag(InitList->getExprLoc(), diag::warn_cxx98_compat_ctor_list_init)
6180 << InitList->getSourceRange();
6181 MultiExprArg Arg(InitList->getInits(), InitList->getNumInits());
6182 CurInit = PerformConstructorInitialization(S, UseTemporary ? TempEntity :
6185 ConstructorInitRequiresZeroInit,
6186 /*IsListInitialization*/true,
6187 /*IsStdInitListInit*/false,
6188 InitList->getLBraceLoc(),
6189 InitList->getRBraceLoc());
6193 case SK_UnwrapInitList:
6194 CurInit = cast<InitListExpr>(CurInit.get())->getInit(0);
6197 case SK_RewrapInitList: {
6198 Expr *E = CurInit.get();
6199 InitListExpr *Syntactic = Step->WrappingSyntacticList;
6200 InitListExpr *ILE = new (S.Context) InitListExpr(S.Context,
6201 Syntactic->getLBraceLoc(), E, Syntactic->getRBraceLoc());
6202 ILE->setSyntacticForm(Syntactic);
6203 ILE->setType(E->getType());
6204 ILE->setValueKind(E->getValueKind());
6209 case SK_ConstructorInitialization:
6210 case SK_StdInitializerListConstructorCall: {
6211 // When an initializer list is passed for a parameter of type "reference
6212 // to object", we don't get an EK_Temporary entity, but instead an
6213 // EK_Parameter entity with reference type.
6214 // FIXME: This is a hack. What we really should do is create a user
6215 // conversion step for this case, but this makes it considerably more
6216 // complicated. For now, this will do.
6217 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
6218 Entity.getType().getNonReferenceType());
6219 bool UseTemporary = Entity.getType()->isReferenceType();
6220 bool IsStdInitListInit =
6221 Step->Kind == SK_StdInitializerListConstructorCall;
6222 CurInit = PerformConstructorInitialization(
6223 S, UseTemporary ? TempEntity : Entity, Kind, Args, *Step,
6224 ConstructorInitRequiresZeroInit,
6225 /*IsListInitialization*/IsStdInitListInit,
6226 /*IsStdInitListInitialization*/IsStdInitListInit,
6227 /*LBraceLoc*/SourceLocation(),
6228 /*RBraceLoc*/SourceLocation());
6232 case SK_ZeroInitialization: {
6233 step_iterator NextStep = Step;
6235 if (NextStep != StepEnd &&
6236 (NextStep->Kind == SK_ConstructorInitialization ||
6237 NextStep->Kind == SK_ConstructorInitializationFromList)) {
6238 // The need for zero-initialization is recorded directly into
6239 // the call to the object's constructor within the next step.
6240 ConstructorInitRequiresZeroInit = true;
6241 } else if (Kind.getKind() == InitializationKind::IK_Value &&
6242 S.getLangOpts().CPlusPlus &&
6243 !Kind.isImplicitValueInit()) {
6244 TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
6246 TSInfo = S.Context.getTrivialTypeSourceInfo(Step->Type,
6247 Kind.getRange().getBegin());
6249 CurInit = new (S.Context) CXXScalarValueInitExpr(
6250 TSInfo->getType().getNonLValueExprType(S.Context), TSInfo,
6251 Kind.getRange().getEnd());
6253 CurInit = new (S.Context) ImplicitValueInitExpr(Step->Type);
6258 case SK_CAssignment: {
6259 QualType SourceType = CurInit.get()->getType();
6260 ExprResult Result = CurInit;
6261 Sema::AssignConvertType ConvTy =
6262 S.CheckSingleAssignmentConstraints(Step->Type, Result, true,
6263 Entity.getKind() == InitializedEntity::EK_Parameter_CF_Audited);
6264 if (Result.isInvalid())
6268 // If this is a call, allow conversion to a transparent union.
6269 ExprResult CurInitExprRes = CurInit;
6270 if (ConvTy != Sema::Compatible &&
6271 Entity.isParameterKind() &&
6272 S.CheckTransparentUnionArgumentConstraints(Step->Type, CurInitExprRes)
6273 == Sema::Compatible)
6274 ConvTy = Sema::Compatible;
6275 if (CurInitExprRes.isInvalid())
6277 CurInit = CurInitExprRes;
6280 if (S.DiagnoseAssignmentResult(ConvTy, Kind.getLocation(),
6281 Step->Type, SourceType,
6283 getAssignmentAction(Entity, true),
6285 PrintInitLocationNote(S, Entity);
6287 } else if (Complained)
6288 PrintInitLocationNote(S, Entity);
6292 case SK_StringInit: {
6293 QualType Ty = Step->Type;
6294 CheckStringInit(CurInit.get(), ResultType ? *ResultType : Ty,
6295 S.Context.getAsArrayType(Ty), S);
6299 case SK_ObjCObjectConversion:
6300 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
6301 CK_ObjCObjectLValueCast,
6302 CurInit.get()->getValueKind());
6306 // Okay: we checked everything before creating this step. Note that
6307 // this is a GNU extension.
6308 S.Diag(Kind.getLocation(), diag::ext_array_init_copy)
6309 << Step->Type << CurInit.get()->getType()
6310 << CurInit.get()->getSourceRange();
6312 // If the destination type is an incomplete array type, update the
6313 // type accordingly.
6315 if (const IncompleteArrayType *IncompleteDest
6316 = S.Context.getAsIncompleteArrayType(Step->Type)) {
6317 if (const ConstantArrayType *ConstantSource
6318 = S.Context.getAsConstantArrayType(CurInit.get()->getType())) {
6319 *ResultType = S.Context.getConstantArrayType(
6320 IncompleteDest->getElementType(),
6321 ConstantSource->getSize(),
6322 ArrayType::Normal, 0);
6328 case SK_ParenthesizedArrayInit:
6329 // Okay: we checked everything before creating this step. Note that
6330 // this is a GNU extension.
6331 S.Diag(Kind.getLocation(), diag::ext_array_init_parens)
6332 << CurInit.get()->getSourceRange();
6335 case SK_PassByIndirectCopyRestore:
6336 case SK_PassByIndirectRestore:
6337 checkIndirectCopyRestoreSource(S, CurInit.get());
6338 CurInit = new (S.Context) ObjCIndirectCopyRestoreExpr(
6339 CurInit.get(), Step->Type,
6340 Step->Kind == SK_PassByIndirectCopyRestore);
6343 case SK_ProduceObjCObject:
6345 ImplicitCastExpr::Create(S.Context, Step->Type, CK_ARCProduceObject,
6346 CurInit.get(), nullptr, VK_RValue);
6349 case SK_StdInitializerList: {
6350 S.Diag(CurInit.get()->getExprLoc(),
6351 diag::warn_cxx98_compat_initializer_list_init)
6352 << CurInit.get()->getSourceRange();
6354 // Materialize the temporary into memory.
6355 MaterializeTemporaryExpr *MTE = new (S.Context)
6356 MaterializeTemporaryExpr(CurInit.get()->getType(), CurInit.get(),
6357 /*BoundToLvalueReference=*/false);
6359 // Maybe lifetime-extend the array temporary's subobjects to match the
6360 // entity's lifetime.
6361 if (const InitializedEntity *ExtendingEntity =
6362 getEntityForTemporaryLifetimeExtension(&Entity))
6363 if (performReferenceExtension(MTE, ExtendingEntity))
6364 warnOnLifetimeExtension(S, Entity, CurInit.get(),
6365 /*IsInitializerList=*/true,
6366 ExtendingEntity->getDecl());
6368 // Wrap it in a construction of a std::initializer_list<T>.
6369 CurInit = new (S.Context) CXXStdInitializerListExpr(Step->Type, MTE);
6371 // Bind the result, in case the library has given initializer_list a
6372 // non-trivial destructor.
6373 if (shouldBindAsTemporary(Entity))
6374 CurInit = S.MaybeBindToTemporary(CurInit.get());
6378 case SK_OCLSamplerInit: {
6379 assert(Step->Type->isSamplerT() &&
6380 "Sampler initialization on non-sampler type.");
6382 QualType SourceType = CurInit.get()->getType();
6384 if (Entity.isParameterKind()) {
6385 if (!SourceType->isSamplerT())
6386 S.Diag(Kind.getLocation(), diag::err_sampler_argument_required)
6388 } else if (Entity.getKind() != InitializedEntity::EK_Variable) {
6389 llvm_unreachable("Invalid EntityKind!");
6394 case SK_OCLZeroEvent: {
6395 assert(Step->Type->isEventT() &&
6396 "Event initialization on non-event type.");
6398 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
6400 CurInit.get()->getValueKind());
6406 // Diagnose non-fatal problems with the completed initialization.
6407 if (Entity.getKind() == InitializedEntity::EK_Member &&
6408 cast<FieldDecl>(Entity.getDecl())->isBitField())
6409 S.CheckBitFieldInitialization(Kind.getLocation(),
6410 cast<FieldDecl>(Entity.getDecl()),
6416 /// Somewhere within T there is an uninitialized reference subobject.
6417 /// Dig it out and diagnose it.
6418 static bool DiagnoseUninitializedReference(Sema &S, SourceLocation Loc,
6420 if (T->isReferenceType()) {
6421 S.Diag(Loc, diag::err_reference_without_init)
6422 << T.getNonReferenceType();
6426 CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
6427 if (!RD || !RD->hasUninitializedReferenceMember())
6430 for (const auto *FI : RD->fields()) {
6431 if (FI->isUnnamedBitfield())
6434 if (DiagnoseUninitializedReference(S, FI->getLocation(), FI->getType())) {
6435 S.Diag(Loc, diag::note_value_initialization_here) << RD;
6440 for (const auto &BI : RD->bases()) {
6441 if (DiagnoseUninitializedReference(S, BI.getLocStart(), BI.getType())) {
6442 S.Diag(Loc, diag::note_value_initialization_here) << RD;
6451 //===----------------------------------------------------------------------===//
6452 // Diagnose initialization failures
6453 //===----------------------------------------------------------------------===//
6455 /// Emit notes associated with an initialization that failed due to a
6456 /// "simple" conversion failure.
6457 static void emitBadConversionNotes(Sema &S, const InitializedEntity &entity,
6459 QualType destType = entity.getType();
6460 if (destType.getNonReferenceType()->isObjCObjectPointerType() &&
6461 op->getType()->isObjCObjectPointerType()) {
6463 // Emit a possible note about the conversion failing because the
6464 // operand is a message send with a related result type.
6465 S.EmitRelatedResultTypeNote(op);
6467 // Emit a possible note about a return failing because we're
6468 // expecting a related result type.
6469 if (entity.getKind() == InitializedEntity::EK_Result)
6470 S.EmitRelatedResultTypeNoteForReturn(destType);
6474 static void diagnoseListInit(Sema &S, const InitializedEntity &Entity,
6475 InitListExpr *InitList) {
6476 QualType DestType = Entity.getType();
6479 if (S.getLangOpts().CPlusPlus11 && S.isStdInitializerList(DestType, &E)) {
6480 QualType ArrayType = S.Context.getConstantArrayType(
6482 llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
6483 InitList->getNumInits()),
6484 clang::ArrayType::Normal, 0);
6485 InitializedEntity HiddenArray =
6486 InitializedEntity::InitializeTemporary(ArrayType);
6487 return diagnoseListInit(S, HiddenArray, InitList);
6490 if (DestType->isReferenceType()) {
6491 // A list-initialization failure for a reference means that we tried to
6492 // create a temporary of the inner type (per [dcl.init.list]p3.6) and the
6493 // inner initialization failed.
6494 QualType T = DestType->getAs<ReferenceType>()->getPointeeType();
6495 diagnoseListInit(S, InitializedEntity::InitializeTemporary(T), InitList);
6496 SourceLocation Loc = InitList->getLocStart();
6497 if (auto *D = Entity.getDecl())
6498 Loc = D->getLocation();
6499 S.Diag(Loc, diag::note_in_reference_temporary_list_initializer) << T;
6503 InitListChecker DiagnoseInitList(S, Entity, InitList, DestType,
6504 /*VerifyOnly=*/false);
6505 assert(DiagnoseInitList.HadError() &&
6506 "Inconsistent init list check result.");
6509 /// Prints a fixit for adding a null initializer for |Entity|. Call this only
6510 /// right after emitting a diagnostic.
6511 static void maybeEmitZeroInitializationFixit(Sema &S,
6512 InitializationSequence &Sequence,
6513 const InitializedEntity &Entity) {
6514 if (Entity.getKind() != InitializedEntity::EK_Variable)
6517 VarDecl *VD = cast<VarDecl>(Entity.getDecl());
6518 if (VD->getInit() || VD->getLocEnd().isMacroID())
6521 QualType VariableTy = VD->getType().getCanonicalType();
6522 SourceLocation Loc = S.getLocForEndOfToken(VD->getLocEnd());
6523 std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
6525 S.Diag(Loc, diag::note_add_initializer)
6526 << VD << FixItHint::CreateInsertion(Loc, Init);
6529 bool InitializationSequence::Diagnose(Sema &S,
6530 const InitializedEntity &Entity,
6531 const InitializationKind &Kind,
6532 ArrayRef<Expr *> Args) {
6536 QualType DestType = Entity.getType();
6538 case FK_TooManyInitsForReference:
6539 // FIXME: Customize for the initialized entity?
6541 // Dig out the reference subobject which is uninitialized and diagnose it.
6542 // If this is value-initialization, this could be nested some way within
6544 assert(Kind.getKind() == InitializationKind::IK_Value ||
6545 DestType->isReferenceType());
6547 DiagnoseUninitializedReference(S, Kind.getLocation(), DestType);
6548 assert(Diagnosed && "couldn't find uninitialized reference to diagnose");
6550 } else // FIXME: diagnostic below could be better!
6551 S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits)
6552 << SourceRange(Args.front()->getLocStart(), Args.back()->getLocEnd());
6555 case FK_ArrayNeedsInitList:
6556 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 0;
6558 case FK_ArrayNeedsInitListOrStringLiteral:
6559 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 1;
6561 case FK_ArrayNeedsInitListOrWideStringLiteral:
6562 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 2;
6564 case FK_NarrowStringIntoWideCharArray:
6565 S.Diag(Kind.getLocation(), diag::err_array_init_narrow_string_into_wchar);
6567 case FK_WideStringIntoCharArray:
6568 S.Diag(Kind.getLocation(), diag::err_array_init_wide_string_into_char);
6570 case FK_IncompatWideStringIntoWideChar:
6571 S.Diag(Kind.getLocation(),
6572 diag::err_array_init_incompat_wide_string_into_wchar);
6574 case FK_ArrayTypeMismatch:
6575 case FK_NonConstantArrayInit:
6576 S.Diag(Kind.getLocation(),
6577 (Failure == FK_ArrayTypeMismatch
6578 ? diag::err_array_init_different_type
6579 : diag::err_array_init_non_constant_array))
6580 << DestType.getNonReferenceType()
6581 << Args[0]->getType()
6582 << Args[0]->getSourceRange();
6585 case FK_VariableLengthArrayHasInitializer:
6586 S.Diag(Kind.getLocation(), diag::err_variable_object_no_init)
6587 << Args[0]->getSourceRange();
6590 case FK_AddressOfOverloadFailed: {
6591 DeclAccessPair Found;
6592 S.ResolveAddressOfOverloadedFunction(Args[0],
6593 DestType.getNonReferenceType(),
6599 case FK_ReferenceInitOverloadFailed:
6600 case FK_UserConversionOverloadFailed:
6601 switch (FailedOverloadResult) {
6603 if (Failure == FK_UserConversionOverloadFailed)
6604 S.Diag(Kind.getLocation(), diag::err_typecheck_ambiguous_condition)
6605 << Args[0]->getType() << DestType
6606 << Args[0]->getSourceRange();
6608 S.Diag(Kind.getLocation(), diag::err_ref_init_ambiguous)
6609 << DestType << Args[0]->getType()
6610 << Args[0]->getSourceRange();
6612 FailedCandidateSet.NoteCandidates(S, OCD_ViableCandidates, Args);
6615 case OR_No_Viable_Function:
6616 if (!S.RequireCompleteType(Kind.getLocation(),
6617 DestType.getNonReferenceType(),
6618 diag::err_typecheck_nonviable_condition_incomplete,
6619 Args[0]->getType(), Args[0]->getSourceRange()))
6620 S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition)
6621 << Args[0]->getType() << Args[0]->getSourceRange()
6622 << DestType.getNonReferenceType();
6624 FailedCandidateSet.NoteCandidates(S, OCD_AllCandidates, Args);
6628 S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function)
6629 << Args[0]->getType() << DestType.getNonReferenceType()
6630 << Args[0]->getSourceRange();
6631 OverloadCandidateSet::iterator Best;
6632 OverloadingResult Ovl
6633 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best,
6635 if (Ovl == OR_Deleted) {
6636 S.NoteDeletedFunction(Best->Function);
6638 llvm_unreachable("Inconsistent overload resolution?");
6644 llvm_unreachable("Conversion did not fail!");
6648 case FK_NonConstLValueReferenceBindingToTemporary:
6649 if (isa<InitListExpr>(Args[0])) {
6650 S.Diag(Kind.getLocation(),
6651 diag::err_lvalue_reference_bind_to_initlist)
6652 << DestType.getNonReferenceType().isVolatileQualified()
6653 << DestType.getNonReferenceType()
6654 << Args[0]->getSourceRange();
6657 // Intentional fallthrough
6659 case FK_NonConstLValueReferenceBindingToUnrelated:
6660 S.Diag(Kind.getLocation(),
6661 Failure == FK_NonConstLValueReferenceBindingToTemporary
6662 ? diag::err_lvalue_reference_bind_to_temporary
6663 : diag::err_lvalue_reference_bind_to_unrelated)
6664 << DestType.getNonReferenceType().isVolatileQualified()
6665 << DestType.getNonReferenceType()
6666 << Args[0]->getType()
6667 << Args[0]->getSourceRange();
6670 case FK_RValueReferenceBindingToLValue:
6671 S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref)
6672 << DestType.getNonReferenceType() << Args[0]->getType()
6673 << Args[0]->getSourceRange();
6676 case FK_ReferenceInitDropsQualifiers:
6677 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
6678 << DestType.getNonReferenceType()
6679 << Args[0]->getType()
6680 << Args[0]->getSourceRange();
6683 case FK_ReferenceInitFailed:
6684 S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
6685 << DestType.getNonReferenceType()
6686 << Args[0]->isLValue()
6687 << Args[0]->getType()
6688 << Args[0]->getSourceRange();
6689 emitBadConversionNotes(S, Entity, Args[0]);
6692 case FK_ConversionFailed: {
6693 QualType FromType = Args[0]->getType();
6694 PartialDiagnostic PDiag = S.PDiag(diag::err_init_conversion_failed)
6695 << (int)Entity.getKind()
6697 << Args[0]->isLValue()
6699 << Args[0]->getSourceRange();
6700 S.HandleFunctionTypeMismatch(PDiag, FromType, DestType);
6701 S.Diag(Kind.getLocation(), PDiag);
6702 emitBadConversionNotes(S, Entity, Args[0]);
6706 case FK_ConversionFromPropertyFailed:
6707 // No-op. This error has already been reported.
6710 case FK_TooManyInitsForScalar: {
6713 if (InitListExpr *InitList = dyn_cast<InitListExpr>(Args[0]))
6714 R = SourceRange(InitList->getInit(0)->getLocEnd(),
6715 InitList->getLocEnd());
6717 R = SourceRange(Args.front()->getLocEnd(), Args.back()->getLocEnd());
6719 R.setBegin(S.getLocForEndOfToken(R.getBegin()));
6720 if (Kind.isCStyleOrFunctionalCast())
6721 S.Diag(Kind.getLocation(), diag::err_builtin_func_cast_more_than_one_arg)
6724 S.Diag(Kind.getLocation(), diag::err_excess_initializers)
6725 << /*scalar=*/2 << R;
6729 case FK_ReferenceBindingToInitList:
6730 S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list)
6731 << DestType.getNonReferenceType() << Args[0]->getSourceRange();
6734 case FK_InitListBadDestinationType:
6735 S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type)
6736 << (DestType->isRecordType()) << DestType << Args[0]->getSourceRange();
6739 case FK_ListConstructorOverloadFailed:
6740 case FK_ConstructorOverloadFailed: {
6741 SourceRange ArgsRange;
6743 ArgsRange = SourceRange(Args.front()->getLocStart(),
6744 Args.back()->getLocEnd());
6746 if (Failure == FK_ListConstructorOverloadFailed) {
6747 assert(Args.size() == 1 &&
6748 "List construction from other than 1 argument.");
6749 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
6750 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
6753 // FIXME: Using "DestType" for the entity we're printing is probably
6755 switch (FailedOverloadResult) {
6757 S.Diag(Kind.getLocation(), diag::err_ovl_ambiguous_init)
6758 << DestType << ArgsRange;
6759 FailedCandidateSet.NoteCandidates(S, OCD_ViableCandidates, Args);
6762 case OR_No_Viable_Function:
6763 if (Kind.getKind() == InitializationKind::IK_Default &&
6764 (Entity.getKind() == InitializedEntity::EK_Base ||
6765 Entity.getKind() == InitializedEntity::EK_Member) &&
6766 isa<CXXConstructorDecl>(S.CurContext)) {
6767 // This is implicit default initialization of a member or
6768 // base within a constructor. If no viable function was
6769 // found, notify the user that she needs to explicitly
6770 // initialize this base/member.
6771 CXXConstructorDecl *Constructor
6772 = cast<CXXConstructorDecl>(S.CurContext);
6773 if (Entity.getKind() == InitializedEntity::EK_Base) {
6774 S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
6775 << (Constructor->getInheritedConstructor() ? 2 :
6776 Constructor->isImplicit() ? 1 : 0)
6777 << S.Context.getTypeDeclType(Constructor->getParent())
6779 << Entity.getType();
6781 RecordDecl *BaseDecl
6782 = Entity.getBaseSpecifier()->getType()->getAs<RecordType>()
6784 S.Diag(BaseDecl->getLocation(), diag::note_previous_decl)
6785 << S.Context.getTagDeclType(BaseDecl);
6787 S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
6788 << (Constructor->getInheritedConstructor() ? 2 :
6789 Constructor->isImplicit() ? 1 : 0)
6790 << S.Context.getTypeDeclType(Constructor->getParent())
6792 << Entity.getName();
6793 S.Diag(Entity.getDecl()->getLocation(),
6794 diag::note_member_declared_at);
6796 if (const RecordType *Record
6797 = Entity.getType()->getAs<RecordType>())
6798 S.Diag(Record->getDecl()->getLocation(),
6799 diag::note_previous_decl)
6800 << S.Context.getTagDeclType(Record->getDecl());
6805 S.Diag(Kind.getLocation(), diag::err_ovl_no_viable_function_in_init)
6806 << DestType << ArgsRange;
6807 FailedCandidateSet.NoteCandidates(S, OCD_AllCandidates, Args);
6811 OverloadCandidateSet::iterator Best;
6812 OverloadingResult Ovl
6813 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
6814 if (Ovl != OR_Deleted) {
6815 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
6816 << true << DestType << ArgsRange;
6817 llvm_unreachable("Inconsistent overload resolution?");
6821 // If this is a defaulted or implicitly-declared function, then
6822 // it was implicitly deleted. Make it clear that the deletion was
6824 if (S.isImplicitlyDeleted(Best->Function))
6825 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_special_init)
6826 << S.getSpecialMember(cast<CXXMethodDecl>(Best->Function))
6827 << DestType << ArgsRange;
6829 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
6830 << true << DestType << ArgsRange;
6832 S.NoteDeletedFunction(Best->Function);
6837 llvm_unreachable("Conversion did not fail!");
6842 case FK_DefaultInitOfConst:
6843 if (Entity.getKind() == InitializedEntity::EK_Member &&
6844 isa<CXXConstructorDecl>(S.CurContext)) {
6845 // This is implicit default-initialization of a const member in
6846 // a constructor. Complain that it needs to be explicitly
6848 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(S.CurContext);
6849 S.Diag(Kind.getLocation(), diag::err_uninitialized_member_in_ctor)
6850 << (Constructor->getInheritedConstructor() ? 2 :
6851 Constructor->isImplicit() ? 1 : 0)
6852 << S.Context.getTypeDeclType(Constructor->getParent())
6854 << Entity.getName();
6855 S.Diag(Entity.getDecl()->getLocation(), diag::note_previous_decl)
6856 << Entity.getName();
6858 S.Diag(Kind.getLocation(), diag::err_default_init_const)
6859 << DestType << (bool)DestType->getAs<RecordType>();
6860 maybeEmitZeroInitializationFixit(S, *this, Entity);
6865 S.RequireCompleteType(Kind.getLocation(), FailedIncompleteType,
6866 diag::err_init_incomplete_type);
6869 case FK_ListInitializationFailed: {
6870 // Run the init list checker again to emit diagnostics.
6871 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
6872 diagnoseListInit(S, Entity, InitList);
6876 case FK_PlaceholderType: {
6877 // FIXME: Already diagnosed!
6881 case FK_ExplicitConstructor: {
6882 S.Diag(Kind.getLocation(), diag::err_selected_explicit_constructor)
6883 << Args[0]->getSourceRange();
6884 OverloadCandidateSet::iterator Best;
6885 OverloadingResult Ovl
6886 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
6888 assert(Ovl == OR_Success && "Inconsistent overload resolution");
6889 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
6890 S.Diag(CtorDecl->getLocation(), diag::note_constructor_declared_here);
6895 PrintInitLocationNote(S, Entity);
6899 void InitializationSequence::dump(raw_ostream &OS) const {
6900 switch (SequenceKind) {
6901 case FailedSequence: {
6902 OS << "Failed sequence: ";
6904 case FK_TooManyInitsForReference:
6905 OS << "too many initializers for reference";
6908 case FK_ArrayNeedsInitList:
6909 OS << "array requires initializer list";
6912 case FK_ArrayNeedsInitListOrStringLiteral:
6913 OS << "array requires initializer list or string literal";
6916 case FK_ArrayNeedsInitListOrWideStringLiteral:
6917 OS << "array requires initializer list or wide string literal";
6920 case FK_NarrowStringIntoWideCharArray:
6921 OS << "narrow string into wide char array";
6924 case FK_WideStringIntoCharArray:
6925 OS << "wide string into char array";
6928 case FK_IncompatWideStringIntoWideChar:
6929 OS << "incompatible wide string into wide char array";
6932 case FK_ArrayTypeMismatch:
6933 OS << "array type mismatch";
6936 case FK_NonConstantArrayInit:
6937 OS << "non-constant array initializer";
6940 case FK_AddressOfOverloadFailed:
6941 OS << "address of overloaded function failed";
6944 case FK_ReferenceInitOverloadFailed:
6945 OS << "overload resolution for reference initialization failed";
6948 case FK_NonConstLValueReferenceBindingToTemporary:
6949 OS << "non-const lvalue reference bound to temporary";
6952 case FK_NonConstLValueReferenceBindingToUnrelated:
6953 OS << "non-const lvalue reference bound to unrelated type";
6956 case FK_RValueReferenceBindingToLValue:
6957 OS << "rvalue reference bound to an lvalue";
6960 case FK_ReferenceInitDropsQualifiers:
6961 OS << "reference initialization drops qualifiers";
6964 case FK_ReferenceInitFailed:
6965 OS << "reference initialization failed";
6968 case FK_ConversionFailed:
6969 OS << "conversion failed";
6972 case FK_ConversionFromPropertyFailed:
6973 OS << "conversion from property failed";
6976 case FK_TooManyInitsForScalar:
6977 OS << "too many initializers for scalar";
6980 case FK_ReferenceBindingToInitList:
6981 OS << "referencing binding to initializer list";
6984 case FK_InitListBadDestinationType:
6985 OS << "initializer list for non-aggregate, non-scalar type";
6988 case FK_UserConversionOverloadFailed:
6989 OS << "overloading failed for user-defined conversion";
6992 case FK_ConstructorOverloadFailed:
6993 OS << "constructor overloading failed";
6996 case FK_DefaultInitOfConst:
6997 OS << "default initialization of a const variable";
7001 OS << "initialization of incomplete type";
7004 case FK_ListInitializationFailed:
7005 OS << "list initialization checker failure";
7008 case FK_VariableLengthArrayHasInitializer:
7009 OS << "variable length array has an initializer";
7012 case FK_PlaceholderType:
7013 OS << "initializer expression isn't contextually valid";
7016 case FK_ListConstructorOverloadFailed:
7017 OS << "list constructor overloading failed";
7020 case FK_ExplicitConstructor:
7021 OS << "list copy initialization chose explicit constructor";
7028 case DependentSequence:
7029 OS << "Dependent sequence\n";
7032 case NormalSequence:
7033 OS << "Normal sequence: ";
7037 for (step_iterator S = step_begin(), SEnd = step_end(); S != SEnd; ++S) {
7038 if (S != step_begin()) {
7043 case SK_ResolveAddressOfOverloadedFunction:
7044 OS << "resolve address of overloaded function";
7047 case SK_CastDerivedToBaseRValue:
7048 OS << "derived-to-base case (rvalue" << S->Type.getAsString() << ")";
7051 case SK_CastDerivedToBaseXValue:
7052 OS << "derived-to-base case (xvalue" << S->Type.getAsString() << ")";
7055 case SK_CastDerivedToBaseLValue:
7056 OS << "derived-to-base case (lvalue" << S->Type.getAsString() << ")";
7059 case SK_BindReference:
7060 OS << "bind reference to lvalue";
7063 case SK_BindReferenceToTemporary:
7064 OS << "bind reference to a temporary";
7067 case SK_ExtraneousCopyToTemporary:
7068 OS << "extraneous C++03 copy to temporary";
7071 case SK_UserConversion:
7072 OS << "user-defined conversion via " << *S->Function.Function;
7075 case SK_QualificationConversionRValue:
7076 OS << "qualification conversion (rvalue)";
7079 case SK_QualificationConversionXValue:
7080 OS << "qualification conversion (xvalue)";
7083 case SK_QualificationConversionLValue:
7084 OS << "qualification conversion (lvalue)";
7087 case SK_AtomicConversion:
7088 OS << "non-atomic-to-atomic conversion";
7091 case SK_LValueToRValue:
7092 OS << "load (lvalue to rvalue)";
7095 case SK_ConversionSequence:
7096 OS << "implicit conversion sequence (";
7097 S->ICS->dump(); // FIXME: use OS
7101 case SK_ConversionSequenceNoNarrowing:
7102 OS << "implicit conversion sequence with narrowing prohibited (";
7103 S->ICS->dump(); // FIXME: use OS
7107 case SK_ListInitialization:
7108 OS << "list aggregate initialization";
7111 case SK_UnwrapInitList:
7112 OS << "unwrap reference initializer list";
7115 case SK_RewrapInitList:
7116 OS << "rewrap reference initializer list";
7119 case SK_ConstructorInitialization:
7120 OS << "constructor initialization";
7123 case SK_ConstructorInitializationFromList:
7124 OS << "list initialization via constructor";
7127 case SK_ZeroInitialization:
7128 OS << "zero initialization";
7131 case SK_CAssignment:
7132 OS << "C assignment";
7136 OS << "string initialization";
7139 case SK_ObjCObjectConversion:
7140 OS << "Objective-C object conversion";
7144 OS << "array initialization";
7147 case SK_ParenthesizedArrayInit:
7148 OS << "parenthesized array initialization";
7151 case SK_PassByIndirectCopyRestore:
7152 OS << "pass by indirect copy and restore";
7155 case SK_PassByIndirectRestore:
7156 OS << "pass by indirect restore";
7159 case SK_ProduceObjCObject:
7160 OS << "Objective-C object retension";
7163 case SK_StdInitializerList:
7164 OS << "std::initializer_list from initializer list";
7167 case SK_StdInitializerListConstructorCall:
7168 OS << "list initialization from std::initializer_list";
7171 case SK_OCLSamplerInit:
7172 OS << "OpenCL sampler_t from integer constant";
7175 case SK_OCLZeroEvent:
7176 OS << "OpenCL event_t from zero";
7180 OS << " [" << S->Type.getAsString() << ']';
7186 void InitializationSequence::dump() const {
7190 static void DiagnoseNarrowingInInitList(Sema &S,
7191 const ImplicitConversionSequence &ICS,
7192 QualType PreNarrowingType,
7193 QualType EntityType,
7194 const Expr *PostInit) {
7195 const StandardConversionSequence *SCS = nullptr;
7196 switch (ICS.getKind()) {
7197 case ImplicitConversionSequence::StandardConversion:
7198 SCS = &ICS.Standard;
7200 case ImplicitConversionSequence::UserDefinedConversion:
7201 SCS = &ICS.UserDefined.After;
7203 case ImplicitConversionSequence::AmbiguousConversion:
7204 case ImplicitConversionSequence::EllipsisConversion:
7205 case ImplicitConversionSequence::BadConversion:
7209 // C++11 [dcl.init.list]p7: Check whether this is a narrowing conversion.
7210 APValue ConstantValue;
7211 QualType ConstantType;
7212 switch (SCS->getNarrowingKind(S.Context, PostInit, ConstantValue,
7214 case NK_Not_Narrowing:
7215 // No narrowing occurred.
7218 case NK_Type_Narrowing:
7219 // This was a floating-to-integer conversion, which is always considered a
7220 // narrowing conversion even if the value is a constant and can be
7221 // represented exactly as an integer.
7222 S.Diag(PostInit->getLocStart(),
7223 (S.getLangOpts().MicrosoftExt || !S.getLangOpts().CPlusPlus11)
7224 ? diag::warn_init_list_type_narrowing
7225 : diag::ext_init_list_type_narrowing)
7226 << PostInit->getSourceRange()
7227 << PreNarrowingType.getLocalUnqualifiedType()
7228 << EntityType.getLocalUnqualifiedType();
7231 case NK_Constant_Narrowing:
7232 // A constant value was narrowed.
7233 S.Diag(PostInit->getLocStart(),
7234 (S.getLangOpts().MicrosoftExt || !S.getLangOpts().CPlusPlus11)
7235 ? diag::warn_init_list_constant_narrowing
7236 : diag::ext_init_list_constant_narrowing)
7237 << PostInit->getSourceRange()
7238 << ConstantValue.getAsString(S.getASTContext(), ConstantType)
7239 << EntityType.getLocalUnqualifiedType();
7242 case NK_Variable_Narrowing:
7243 // A variable's value may have been narrowed.
7244 S.Diag(PostInit->getLocStart(),
7245 (S.getLangOpts().MicrosoftExt || !S.getLangOpts().CPlusPlus11)
7246 ? diag::warn_init_list_variable_narrowing
7247 : diag::ext_init_list_variable_narrowing)
7248 << PostInit->getSourceRange()
7249 << PreNarrowingType.getLocalUnqualifiedType()
7250 << EntityType.getLocalUnqualifiedType();
7254 SmallString<128> StaticCast;
7255 llvm::raw_svector_ostream OS(StaticCast);
7256 OS << "static_cast<";
7257 if (const TypedefType *TT = EntityType->getAs<TypedefType>()) {
7258 // It's important to use the typedef's name if there is one so that the
7259 // fixit doesn't break code using types like int64_t.
7261 // FIXME: This will break if the typedef requires qualification. But
7262 // getQualifiedNameAsString() includes non-machine-parsable components.
7263 OS << *TT->getDecl();
7264 } else if (const BuiltinType *BT = EntityType->getAs<BuiltinType>())
7265 OS << BT->getName(S.getLangOpts());
7267 // Oops, we didn't find the actual type of the variable. Don't emit a fixit
7268 // with a broken cast.
7272 S.Diag(PostInit->getLocStart(), diag::note_init_list_narrowing_silence)
7273 << PostInit->getSourceRange()
7274 << FixItHint::CreateInsertion(PostInit->getLocStart(), OS.str())
7275 << FixItHint::CreateInsertion(
7276 S.getLocForEndOfToken(PostInit->getLocEnd()), ")");
7279 //===----------------------------------------------------------------------===//
7280 // Initialization helper functions
7281 //===----------------------------------------------------------------------===//
7283 Sema::CanPerformCopyInitialization(const InitializedEntity &Entity,
7285 if (Init.isInvalid())
7288 Expr *InitE = Init.get();
7289 assert(InitE && "No initialization expression");
7291 InitializationKind Kind
7292 = InitializationKind::CreateCopy(InitE->getLocStart(), SourceLocation());
7293 InitializationSequence Seq(*this, Entity, Kind, InitE);
7294 return !Seq.Failed();
7298 Sema::PerformCopyInitialization(const InitializedEntity &Entity,
7299 SourceLocation EqualLoc,
7301 bool TopLevelOfInitList,
7302 bool AllowExplicit) {
7303 if (Init.isInvalid())
7306 Expr *InitE = Init.get();
7307 assert(InitE && "No initialization expression?");
7309 if (EqualLoc.isInvalid())
7310 EqualLoc = InitE->getLocStart();
7312 InitializationKind Kind = InitializationKind::CreateCopy(InitE->getLocStart(),
7315 InitializationSequence Seq(*this, Entity, Kind, InitE, TopLevelOfInitList);
7318 ExprResult Result = Seq.Perform(*this, Entity, Kind, InitE);