| //===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements semantic analysis for initializers. The main entry |
| // point is Sema::CheckInitList(), but all of the work is performed |
| // within the InitListChecker class. |
| // |
| // This file also implements Sema::CheckInitializerTypes. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "SemaInit.h" |
| #include "Lookup.h" |
| #include "Sema.h" |
| #include "clang/Parse/Designator.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/ExprCXX.h" |
| #include "clang/AST/ExprObjC.h" |
| #include "clang/AST/TypeLoc.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include <map> |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // Sema Initialization Checking |
| //===----------------------------------------------------------------------===// |
| |
| static Expr *IsStringInit(Expr *Init, QualType DeclType, ASTContext &Context) { |
| const ArrayType *AT = Context.getAsArrayType(DeclType); |
| if (!AT) return 0; |
| |
| if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT)) |
| return 0; |
| |
| // See if this is a string literal or @encode. |
| Init = Init->IgnoreParens(); |
| |
| // Handle @encode, which is a narrow string. |
| if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType()) |
| return Init; |
| |
| // Otherwise we can only handle string literals. |
| StringLiteral *SL = dyn_cast<StringLiteral>(Init); |
| if (SL == 0) return 0; |
| |
| QualType ElemTy = Context.getCanonicalType(AT->getElementType()); |
| // char array can be initialized with a narrow string. |
| // Only allow char x[] = "foo"; not char x[] = L"foo"; |
| if (!SL->isWide()) |
| return ElemTy->isCharType() ? Init : 0; |
| |
| // wchar_t array can be initialized with a wide string: C99 6.7.8p15 (with |
| // correction from DR343): "An array with element type compatible with a |
| // qualified or unqualified version of wchar_t may be initialized by a wide |
| // string literal, optionally enclosed in braces." |
| if (Context.typesAreCompatible(Context.getWCharType(), |
| ElemTy.getUnqualifiedType())) |
| return Init; |
| |
| return 0; |
| } |
| |
| static void CheckStringInit(Expr *Str, QualType &DeclT, Sema &S) { |
| // Get the length of the string as parsed. |
| uint64_t StrLength = |
| cast<ConstantArrayType>(Str->getType())->getSize().getZExtValue(); |
| |
| |
| const ArrayType *AT = S.Context.getAsArrayType(DeclT); |
| if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { |
| // C99 6.7.8p14. We have an array of character type with unknown size |
| // being initialized to a string literal. |
| llvm::APSInt ConstVal(32); |
| ConstVal = StrLength; |
| // Return a new array type (C99 6.7.8p22). |
| DeclT = S.Context.getConstantArrayType(IAT->getElementType(), |
| ConstVal, |
| ArrayType::Normal, 0); |
| return; |
| } |
| |
| const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); |
| |
| // C99 6.7.8p14. We have an array of character type with known size. However, |
| // the size may be smaller or larger than the string we are initializing. |
| // FIXME: Avoid truncation for 64-bit length strings. |
| if (StrLength-1 > CAT->getSize().getZExtValue()) |
| S.Diag(Str->getSourceRange().getBegin(), |
| diag::warn_initializer_string_for_char_array_too_long) |
| << Str->getSourceRange(); |
| |
| // Set the type to the actual size that we are initializing. If we have |
| // something like: |
| // char x[1] = "foo"; |
| // then this will set the string literal's type to char[1]. |
| Str->setType(DeclT); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Semantic checking for initializer lists. |
| //===----------------------------------------------------------------------===// |
| |
| /// @brief Semantic checking for initializer lists. |
| /// |
| /// The InitListChecker class contains a set of routines that each |
| /// handle the initialization of a certain kind of entity, e.g., |
| /// arrays, vectors, struct/union types, scalars, etc. The |
| /// InitListChecker itself performs a recursive walk of the subobject |
| /// structure of the type to be initialized, while stepping through |
| /// the initializer list one element at a time. The IList and Index |
| /// parameters to each of the Check* routines contain the active |
| /// (syntactic) initializer list and the index into that initializer |
| /// list that represents the current initializer. Each routine is |
| /// responsible for moving that Index forward as it consumes elements. |
| /// |
| /// Each Check* routine also has a StructuredList/StructuredIndex |
| /// arguments, which contains the current the "structured" (semantic) |
| /// initializer list and the index into that initializer list where we |
| /// are copying initializers as we map them over to the semantic |
| /// list. Once we have completed our recursive walk of the subobject |
| /// structure, we will have constructed a full semantic initializer |
| /// list. |
| /// |
| /// C99 designators cause changes in the initializer list traversal, |
| /// because they make the initialization "jump" into a specific |
| /// subobject and then continue the initialization from that |
| /// point. CheckDesignatedInitializer() recursively steps into the |
| /// designated subobject and manages backing out the recursion to |
| /// initialize the subobjects after the one designated. |
| namespace { |
| class InitListChecker { |
| Sema &SemaRef; |
| bool hadError; |
| std::map<InitListExpr *, InitListExpr *> SyntacticToSemantic; |
| InitListExpr *FullyStructuredList; |
| |
| void CheckImplicitInitList(const InitializedEntity &Entity, |
| InitListExpr *ParentIList, QualType T, |
| unsigned &Index, InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject = false); |
| void CheckExplicitInitList(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType &T, |
| unsigned &Index, InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject = false); |
| void CheckListElementTypes(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType &DeclType, |
| bool SubobjectIsDesignatorContext, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject = false); |
| void CheckSubElementType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType ElemType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex); |
| void CheckScalarType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex); |
| void CheckReferenceType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex); |
| void CheckVectorType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex); |
| void CheckStructUnionTypes(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, |
| RecordDecl::field_iterator Field, |
| bool SubobjectIsDesignatorContext, unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject = false); |
| void CheckArrayType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType &DeclType, |
| llvm::APSInt elementIndex, |
| bool SubobjectIsDesignatorContext, unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex); |
| bool CheckDesignatedInitializer(const InitializedEntity &Entity, |
| InitListExpr *IList, DesignatedInitExpr *DIE, |
| unsigned DesigIdx, |
| QualType &CurrentObjectType, |
| RecordDecl::field_iterator *NextField, |
| llvm::APSInt *NextElementIndex, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool FinishSubobjectInit, |
| bool TopLevelObject); |
| InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index, |
| QualType CurrentObjectType, |
| InitListExpr *StructuredList, |
| unsigned StructuredIndex, |
| SourceRange InitRange); |
| void UpdateStructuredListElement(InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| Expr *expr); |
| int numArrayElements(QualType DeclType); |
| int numStructUnionElements(QualType DeclType); |
| |
| void FillInValueInitForField(unsigned Init, FieldDecl *Field, |
| const InitializedEntity &ParentEntity, |
| InitListExpr *ILE, bool &RequiresSecondPass); |
| void FillInValueInitializations(const InitializedEntity &Entity, |
| InitListExpr *ILE, bool &RequiresSecondPass); |
| public: |
| InitListChecker(Sema &S, const InitializedEntity &Entity, |
| InitListExpr *IL, QualType &T); |
| bool HadError() { return hadError; } |
| |
| // @brief Retrieves the fully-structured initializer list used for |
| // semantic analysis and code generation. |
| InitListExpr *getFullyStructuredList() const { return FullyStructuredList; } |
| }; |
| } // end anonymous namespace |
| |
| void InitListChecker::FillInValueInitForField(unsigned Init, FieldDecl *Field, |
| const InitializedEntity &ParentEntity, |
| InitListExpr *ILE, |
| bool &RequiresSecondPass) { |
| SourceLocation Loc = ILE->getSourceRange().getBegin(); |
| unsigned NumInits = ILE->getNumInits(); |
| InitializedEntity MemberEntity |
| = InitializedEntity::InitializeMember(Field, &ParentEntity); |
| if (Init >= NumInits || !ILE->getInit(Init)) { |
| // FIXME: We probably don't need to handle references |
| // specially here, since value-initialization of references is |
| // handled in InitializationSequence. |
| if (Field->getType()->isReferenceType()) { |
| // C++ [dcl.init.aggr]p9: |
| // If an incomplete or empty initializer-list leaves a |
| // member of reference type uninitialized, the program is |
| // ill-formed. |
| SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized) |
| << Field->getType() |
| << ILE->getSyntacticForm()->getSourceRange(); |
| SemaRef.Diag(Field->getLocation(), |
| diag::note_uninit_reference_member); |
| hadError = true; |
| return; |
| } |
| |
| InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc, |
| true); |
| InitializationSequence InitSeq(SemaRef, MemberEntity, Kind, 0, 0); |
| if (!InitSeq) { |
| InitSeq.Diagnose(SemaRef, MemberEntity, Kind, 0, 0); |
| hadError = true; |
| return; |
| } |
| |
| Sema::OwningExprResult MemberInit |
| = InitSeq.Perform(SemaRef, MemberEntity, Kind, |
| Sema::MultiExprArg(SemaRef, 0, 0)); |
| if (MemberInit.isInvalid()) { |
| hadError = true; |
| return; |
| } |
| |
| if (hadError) { |
| // Do nothing |
| } else if (Init < NumInits) { |
| ILE->setInit(Init, MemberInit.takeAs<Expr>()); |
| } else if (InitSeq.getKind() |
| == InitializationSequence::ConstructorInitialization) { |
| // Value-initialization requires a constructor call, so |
| // extend the initializer list to include the constructor |
| // call and make a note that we'll need to take another pass |
| // through the initializer list. |
| ILE->updateInit(Init, MemberInit.takeAs<Expr>()); |
| RequiresSecondPass = true; |
| } |
| } else if (InitListExpr *InnerILE |
| = dyn_cast<InitListExpr>(ILE->getInit(Init))) |
| FillInValueInitializations(MemberEntity, InnerILE, |
| RequiresSecondPass); |
| } |
| |
| /// Recursively replaces NULL values within the given initializer list |
| /// with expressions that perform value-initialization of the |
| /// appropriate type. |
| void |
| InitListChecker::FillInValueInitializations(const InitializedEntity &Entity, |
| InitListExpr *ILE, |
| bool &RequiresSecondPass) { |
| assert((ILE->getType() != SemaRef.Context.VoidTy) && |
| "Should not have void type"); |
| SourceLocation Loc = ILE->getSourceRange().getBegin(); |
| if (ILE->getSyntacticForm()) |
| Loc = ILE->getSyntacticForm()->getSourceRange().getBegin(); |
| |
| if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) { |
| if (RType->getDecl()->isUnion() && |
| ILE->getInitializedFieldInUnion()) |
| FillInValueInitForField(0, ILE->getInitializedFieldInUnion(), |
| Entity, ILE, RequiresSecondPass); |
| else { |
| unsigned Init = 0; |
| for (RecordDecl::field_iterator |
| Field = RType->getDecl()->field_begin(), |
| FieldEnd = RType->getDecl()->field_end(); |
| Field != FieldEnd; ++Field) { |
| if (Field->isUnnamedBitfield()) |
| continue; |
| |
| if (hadError) |
| return; |
| |
| FillInValueInitForField(Init, *Field, Entity, ILE, RequiresSecondPass); |
| if (hadError) |
| return; |
| |
| ++Init; |
| |
| // Only look at the first initialization of a union. |
| if (RType->getDecl()->isUnion()) |
| break; |
| } |
| } |
| |
| return; |
| } |
| |
| QualType ElementType; |
| |
| InitializedEntity ElementEntity = Entity; |
| unsigned NumInits = ILE->getNumInits(); |
| unsigned NumElements = NumInits; |
| if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) { |
| ElementType = AType->getElementType(); |
| if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) |
| NumElements = CAType->getSize().getZExtValue(); |
| ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context, |
| 0, Entity); |
| } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) { |
| ElementType = VType->getElementType(); |
| NumElements = VType->getNumElements(); |
| ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context, |
| 0, Entity); |
| } else |
| ElementType = ILE->getType(); |
| |
| |
| for (unsigned Init = 0; Init != NumElements; ++Init) { |
| if (hadError) |
| return; |
| |
| if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement || |
| ElementEntity.getKind() == InitializedEntity::EK_VectorElement) |
| ElementEntity.setElementIndex(Init); |
| |
| if (Init >= NumInits || !ILE->getInit(Init)) { |
| InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc, |
| true); |
| InitializationSequence InitSeq(SemaRef, ElementEntity, Kind, 0, 0); |
| if (!InitSeq) { |
| InitSeq.Diagnose(SemaRef, ElementEntity, Kind, 0, 0); |
| hadError = true; |
| return; |
| } |
| |
| Sema::OwningExprResult ElementInit |
| = InitSeq.Perform(SemaRef, ElementEntity, Kind, |
| Sema::MultiExprArg(SemaRef, 0, 0)); |
| if (ElementInit.isInvalid()) { |
| hadError = true; |
| return; |
| } |
| |
| if (hadError) { |
| // Do nothing |
| } else if (Init < NumInits) { |
| ILE->setInit(Init, ElementInit.takeAs<Expr>()); |
| } else if (InitSeq.getKind() |
| == InitializationSequence::ConstructorInitialization) { |
| // Value-initialization requires a constructor call, so |
| // extend the initializer list to include the constructor |
| // call and make a note that we'll need to take another pass |
| // through the initializer list. |
| ILE->updateInit(Init, ElementInit.takeAs<Expr>()); |
| RequiresSecondPass = true; |
| } |
| } else if (InitListExpr *InnerILE |
| = dyn_cast<InitListExpr>(ILE->getInit(Init))) |
| FillInValueInitializations(ElementEntity, InnerILE, RequiresSecondPass); |
| } |
| } |
| |
| |
| InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity, |
| InitListExpr *IL, QualType &T) |
| : SemaRef(S) { |
| hadError = false; |
| |
| unsigned newIndex = 0; |
| unsigned newStructuredIndex = 0; |
| FullyStructuredList |
| = getStructuredSubobjectInit(IL, newIndex, T, 0, 0, IL->getSourceRange()); |
| CheckExplicitInitList(Entity, IL, T, newIndex, |
| FullyStructuredList, newStructuredIndex, |
| /*TopLevelObject=*/true); |
| |
| if (!hadError) { |
| bool RequiresSecondPass = false; |
| FillInValueInitializations(Entity, FullyStructuredList, RequiresSecondPass); |
| if (RequiresSecondPass && !hadError) |
| FillInValueInitializations(Entity, FullyStructuredList, |
| RequiresSecondPass); |
| } |
| } |
| |
| int InitListChecker::numArrayElements(QualType DeclType) { |
| // FIXME: use a proper constant |
| int maxElements = 0x7FFFFFFF; |
| if (const ConstantArrayType *CAT = |
| SemaRef.Context.getAsConstantArrayType(DeclType)) { |
| maxElements = static_cast<int>(CAT->getSize().getZExtValue()); |
| } |
| return maxElements; |
| } |
| |
| int InitListChecker::numStructUnionElements(QualType DeclType) { |
| RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl(); |
| int InitializableMembers = 0; |
| for (RecordDecl::field_iterator |
| Field = structDecl->field_begin(), |
| FieldEnd = structDecl->field_end(); |
| Field != FieldEnd; ++Field) { |
| if ((*Field)->getIdentifier() || !(*Field)->isBitField()) |
| ++InitializableMembers; |
| } |
| if (structDecl->isUnion()) |
| return std::min(InitializableMembers, 1); |
| return InitializableMembers - structDecl->hasFlexibleArrayMember(); |
| } |
| |
| void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity, |
| InitListExpr *ParentIList, |
| QualType T, unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject) { |
| int maxElements = 0; |
| |
| if (T->isArrayType()) |
| maxElements = numArrayElements(T); |
| else if (T->isStructureType() || T->isUnionType()) |
| maxElements = numStructUnionElements(T); |
| else if (T->isVectorType()) |
| maxElements = T->getAs<VectorType>()->getNumElements(); |
| else |
| assert(0 && "CheckImplicitInitList(): Illegal type"); |
| |
| if (maxElements == 0) { |
| SemaRef.Diag(ParentIList->getInit(Index)->getLocStart(), |
| diag::err_implicit_empty_initializer); |
| ++Index; |
| hadError = true; |
| return; |
| } |
| |
| // Build a structured initializer list corresponding to this subobject. |
| InitListExpr *StructuredSubobjectInitList |
| = getStructuredSubobjectInit(ParentIList, Index, T, StructuredList, |
| StructuredIndex, |
| SourceRange(ParentIList->getInit(Index)->getSourceRange().getBegin(), |
| ParentIList->getSourceRange().getEnd())); |
| unsigned StructuredSubobjectInitIndex = 0; |
| |
| // Check the element types and build the structural subobject. |
| unsigned StartIndex = Index; |
| CheckListElementTypes(Entity, ParentIList, T, |
| /*SubobjectIsDesignatorContext=*/false, Index, |
| StructuredSubobjectInitList, |
| StructuredSubobjectInitIndex, |
| TopLevelObject); |
| unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1); |
| StructuredSubobjectInitList->setType(T); |
| |
| // Update the structured sub-object initializer so that it's ending |
| // range corresponds with the end of the last initializer it used. |
| if (EndIndex < ParentIList->getNumInits()) { |
| SourceLocation EndLoc |
| = ParentIList->getInit(EndIndex)->getSourceRange().getEnd(); |
| StructuredSubobjectInitList->setRBraceLoc(EndLoc); |
| } |
| } |
| |
| void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType &T, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject) { |
| assert(IList->isExplicit() && "Illegal Implicit InitListExpr"); |
| SyntacticToSemantic[IList] = StructuredList; |
| StructuredList->setSyntacticForm(IList); |
| CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true, |
| Index, StructuredList, StructuredIndex, TopLevelObject); |
| IList->setType(T); |
| StructuredList->setType(T); |
| if (hadError) |
| return; |
| |
| if (Index < IList->getNumInits()) { |
| // We have leftover initializers |
| if (StructuredIndex == 1 && |
| IsStringInit(StructuredList->getInit(0), T, SemaRef.Context)) { |
| unsigned DK = diag::warn_excess_initializers_in_char_array_initializer; |
| if (SemaRef.getLangOptions().CPlusPlus) { |
| DK = diag::err_excess_initializers_in_char_array_initializer; |
| hadError = true; |
| } |
| // Special-case |
| SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK) |
| << IList->getInit(Index)->getSourceRange(); |
| } else if (!T->isIncompleteType()) { |
| // Don't complain for incomplete types, since we'll get an error |
| // elsewhere |
| QualType CurrentObjectType = StructuredList->getType(); |
| int initKind = |
| CurrentObjectType->isArrayType()? 0 : |
| CurrentObjectType->isVectorType()? 1 : |
| CurrentObjectType->isScalarType()? 2 : |
| CurrentObjectType->isUnionType()? 3 : |
| 4; |
| |
| unsigned DK = diag::warn_excess_initializers; |
| if (SemaRef.getLangOptions().CPlusPlus) { |
| DK = diag::err_excess_initializers; |
| hadError = true; |
| } |
| if (SemaRef.getLangOptions().OpenCL && initKind == 1) { |
| DK = diag::err_excess_initializers; |
| hadError = true; |
| } |
| |
| SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK) |
| << initKind << IList->getInit(Index)->getSourceRange(); |
| } |
| } |
| |
| if (T->isScalarType() && !TopLevelObject) |
| SemaRef.Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init) |
| << IList->getSourceRange() |
| << CodeModificationHint::CreateRemoval(IList->getLocStart()) |
| << CodeModificationHint::CreateRemoval(IList->getLocEnd()); |
| } |
| |
| void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity, |
| InitListExpr *IList, |
| QualType &DeclType, |
| bool SubobjectIsDesignatorContext, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject) { |
| if (DeclType->isScalarType()) { |
| CheckScalarType(Entity, IList, DeclType, Index, |
| StructuredList, StructuredIndex); |
| } else if (DeclType->isVectorType()) { |
| CheckVectorType(Entity, IList, DeclType, Index, |
| StructuredList, StructuredIndex); |
| } else if (DeclType->isAggregateType()) { |
| if (DeclType->isRecordType()) { |
| RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl(); |
| CheckStructUnionTypes(Entity, IList, DeclType, RD->field_begin(), |
| SubobjectIsDesignatorContext, Index, |
| StructuredList, StructuredIndex, |
| TopLevelObject); |
| } else if (DeclType->isArrayType()) { |
| llvm::APSInt Zero( |
| SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()), |
| false); |
| CheckArrayType(Entity, IList, DeclType, Zero, |
| SubobjectIsDesignatorContext, Index, |
| StructuredList, StructuredIndex); |
| } else |
| assert(0 && "Aggregate that isn't a structure or array?!"); |
| } else if (DeclType->isVoidType() || DeclType->isFunctionType()) { |
| // This type is invalid, issue a diagnostic. |
| ++Index; |
| SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type) |
| << DeclType; |
| hadError = true; |
| } else if (DeclType->isRecordType()) { |
| // C++ [dcl.init]p14: |
| // [...] If the class is an aggregate (8.5.1), and the initializer |
| // is a brace-enclosed list, see 8.5.1. |
| // |
| // Note: 8.5.1 is handled below; here, we diagnose the case where |
| // we have an initializer list and a destination type that is not |
| // an aggregate. |
| // FIXME: In C++0x, this is yet another form of initialization. |
| SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list) |
| << DeclType << IList->getSourceRange(); |
| hadError = true; |
| } else if (DeclType->isReferenceType()) { |
| CheckReferenceType(Entity, IList, DeclType, Index, |
| StructuredList, StructuredIndex); |
| } else { |
| // In C, all types are either scalars or aggregates, but |
| // additional handling is needed here for C++ (and possibly others?). |
| assert(0 && "Unsupported initializer type"); |
| } |
| } |
| |
| void InitListChecker::CheckSubElementType(const InitializedEntity &Entity, |
| InitListExpr *IList, |
| QualType ElemType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex) { |
| Expr *expr = IList->getInit(Index); |
| if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { |
| unsigned newIndex = 0; |
| unsigned newStructuredIndex = 0; |
| InitListExpr *newStructuredList |
| = getStructuredSubobjectInit(IList, Index, ElemType, |
| StructuredList, StructuredIndex, |
| SubInitList->getSourceRange()); |
| CheckExplicitInitList(Entity, SubInitList, ElemType, newIndex, |
| newStructuredList, newStructuredIndex); |
| ++StructuredIndex; |
| ++Index; |
| } else if (Expr *Str = IsStringInit(expr, ElemType, SemaRef.Context)) { |
| CheckStringInit(Str, ElemType, SemaRef); |
| UpdateStructuredListElement(StructuredList, StructuredIndex, Str); |
| ++Index; |
| } else if (ElemType->isScalarType()) { |
| CheckScalarType(Entity, IList, ElemType, Index, |
| StructuredList, StructuredIndex); |
| } else if (ElemType->isReferenceType()) { |
| CheckReferenceType(Entity, IList, ElemType, Index, |
| StructuredList, StructuredIndex); |
| } else { |
| if (SemaRef.getLangOptions().CPlusPlus) { |
| // C++ [dcl.init.aggr]p12: |
| // All implicit type conversions (clause 4) are considered when |
| // initializing the aggregate member with an ini- tializer from |
| // an initializer-list. If the initializer can initialize a |
| // member, the member is initialized. [...] |
| |
| // FIXME: Better EqualLoc? |
| InitializationKind Kind = |
| InitializationKind::CreateCopy(expr->getLocStart(), SourceLocation()); |
| InitializationSequence Seq(SemaRef, Entity, Kind, &expr, 1); |
| |
| if (Seq) { |
| Sema::OwningExprResult Result = |
| Seq.Perform(SemaRef, Entity, Kind, |
| Sema::MultiExprArg(SemaRef, (void **)&expr, 1)); |
| if (Result.isInvalid()) |
| hadError = true; |
| |
| UpdateStructuredListElement(StructuredList, StructuredIndex, |
| Result.takeAs<Expr>()); |
| ++Index; |
| return; |
| } |
| |
| // Fall through for subaggregate initialization |
| } else { |
| // C99 6.7.8p13: |
| // |
| // The initializer for a structure or union object that has |
| // automatic storage duration shall be either an initializer |
| // list as described below, or a single expression that has |
| // compatible structure or union type. In the latter case, the |
| // initial value of the object, including unnamed members, is |
| // that of the expression. |
| if ((ElemType->isRecordType() || ElemType->isVectorType()) && |
| SemaRef.Context.hasSameUnqualifiedType(expr->getType(), ElemType)) { |
| UpdateStructuredListElement(StructuredList, StructuredIndex, expr); |
| ++Index; |
| return; |
| } |
| |
| // Fall through for subaggregate initialization |
| } |
| |
| // C++ [dcl.init.aggr]p12: |
| // |
| // [...] Otherwise, if the member is itself a non-empty |
| // subaggregate, brace elision is assumed and the initializer is |
| // considered for the initialization of the first member of |
| // the subaggregate. |
| if (ElemType->isAggregateType() || ElemType->isVectorType()) { |
| CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList, |
| StructuredIndex); |
| ++StructuredIndex; |
| } else { |
| // We cannot initialize this element, so let |
| // PerformCopyInitialization produce the appropriate diagnostic. |
| SemaRef.PerformCopyInitialization(Entity, SourceLocation(), |
| SemaRef.Owned(expr)); |
| IList->setInit(Index, 0); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| } |
| } |
| } |
| |
| void InitListChecker::CheckScalarType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex) { |
| if (Index < IList->getNumInits()) { |
| Expr *expr = IList->getInit(Index); |
| if (isa<InitListExpr>(expr)) { |
| SemaRef.Diag(IList->getLocStart(), |
| diag::err_many_braces_around_scalar_init) |
| << IList->getSourceRange(); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| return; |
| } else if (isa<DesignatedInitExpr>(expr)) { |
| SemaRef.Diag(expr->getSourceRange().getBegin(), |
| diag::err_designator_for_scalar_init) |
| << DeclType << expr->getSourceRange(); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| return; |
| } |
| |
| Sema::OwningExprResult Result = |
| SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), |
| SemaRef.Owned(expr)); |
| |
| Expr *ResultExpr; |
| |
| if (Result.isInvalid()) |
| hadError = true; // types weren't compatible. |
| else { |
| ResultExpr = Result.takeAs<Expr>(); |
| |
| if (ResultExpr != expr) { |
| // The type was promoted, update initializer list. |
| IList->setInit(Index, ResultExpr); |
| } |
| } |
| if (hadError) |
| ++StructuredIndex; |
| else |
| UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr); |
| ++Index; |
| } else { |
| SemaRef.Diag(IList->getLocStart(), diag::err_empty_scalar_initializer) |
| << IList->getSourceRange(); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| return; |
| } |
| } |
| |
| void InitListChecker::CheckReferenceType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex) { |
| if (Index < IList->getNumInits()) { |
| Expr *expr = IList->getInit(Index); |
| if (isa<InitListExpr>(expr)) { |
| SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list) |
| << DeclType << IList->getSourceRange(); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| return; |
| } |
| |
| Sema::OwningExprResult Result = |
| SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), |
| SemaRef.Owned(expr)); |
| |
| if (Result.isInvalid()) |
| hadError = true; |
| |
| expr = Result.takeAs<Expr>(); |
| IList->setInit(Index, expr); |
| |
| if (hadError) |
| ++StructuredIndex; |
| else |
| UpdateStructuredListElement(StructuredList, StructuredIndex, expr); |
| ++Index; |
| } else { |
| // FIXME: It would be wonderful if we could point at the actual member. In |
| // general, it would be useful to pass location information down the stack, |
| // so that we know the location (or decl) of the "current object" being |
| // initialized. |
| SemaRef.Diag(IList->getLocStart(), |
| diag::err_init_reference_member_uninitialized) |
| << DeclType |
| << IList->getSourceRange(); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| return; |
| } |
| } |
| |
| void InitListChecker::CheckVectorType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType DeclType, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex) { |
| if (Index < IList->getNumInits()) { |
| const VectorType *VT = DeclType->getAs<VectorType>(); |
| unsigned maxElements = VT->getNumElements(); |
| unsigned numEltsInit = 0; |
| QualType elementType = VT->getElementType(); |
| |
| if (!SemaRef.getLangOptions().OpenCL) { |
| InitializedEntity ElementEntity = |
| InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); |
| |
| for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) { |
| // Don't attempt to go past the end of the init list |
| if (Index >= IList->getNumInits()) |
| break; |
| |
| ElementEntity.setElementIndex(Index); |
| CheckSubElementType(ElementEntity, IList, elementType, Index, |
| StructuredList, StructuredIndex); |
| } |
| } else { |
| InitializedEntity ElementEntity = |
| InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); |
| |
| // OpenCL initializers allows vectors to be constructed from vectors. |
| for (unsigned i = 0; i < maxElements; ++i) { |
| // Don't attempt to go past the end of the init list |
| if (Index >= IList->getNumInits()) |
| break; |
| |
| ElementEntity.setElementIndex(Index); |
| |
| QualType IType = IList->getInit(Index)->getType(); |
| if (!IType->isVectorType()) { |
| CheckSubElementType(ElementEntity, IList, elementType, Index, |
| StructuredList, StructuredIndex); |
| ++numEltsInit; |
| } else { |
| const VectorType *IVT = IType->getAs<VectorType>(); |
| unsigned numIElts = IVT->getNumElements(); |
| QualType VecType = SemaRef.Context.getExtVectorType(elementType, |
| numIElts); |
| CheckSubElementType(ElementEntity, IList, VecType, Index, |
| StructuredList, StructuredIndex); |
| numEltsInit += numIElts; |
| } |
| } |
| } |
| |
| // OpenCL & AltiVec require all elements to be initialized. |
| if (numEltsInit != maxElements) |
| if (SemaRef.getLangOptions().OpenCL || SemaRef.getLangOptions().AltiVec) |
| SemaRef.Diag(IList->getSourceRange().getBegin(), |
| diag::err_vector_incorrect_num_initializers) |
| << (numEltsInit < maxElements) << maxElements << numEltsInit; |
| } |
| } |
| |
| void InitListChecker::CheckArrayType(const InitializedEntity &Entity, |
| InitListExpr *IList, QualType &DeclType, |
| llvm::APSInt elementIndex, |
| bool SubobjectIsDesignatorContext, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex) { |
| // Check for the special-case of initializing an array with a string. |
| if (Index < IList->getNumInits()) { |
| if (Expr *Str = IsStringInit(IList->getInit(Index), DeclType, |
| SemaRef.Context)) { |
| CheckStringInit(Str, DeclType, SemaRef); |
| // We place the string literal directly into the resulting |
| // initializer list. This is the only place where the structure |
| // of the structured initializer list doesn't match exactly, |
| // because doing so would involve allocating one character |
| // constant for each string. |
| UpdateStructuredListElement(StructuredList, StructuredIndex, Str); |
| StructuredList->resizeInits(SemaRef.Context, StructuredIndex); |
| ++Index; |
| return; |
| } |
| } |
| if (const VariableArrayType *VAT = |
| SemaRef.Context.getAsVariableArrayType(DeclType)) { |
| // Check for VLAs; in standard C it would be possible to check this |
| // earlier, but I don't know where clang accepts VLAs (gcc accepts |
| // them in all sorts of strange places). |
| SemaRef.Diag(VAT->getSizeExpr()->getLocStart(), |
| diag::err_variable_object_no_init) |
| << VAT->getSizeExpr()->getSourceRange(); |
| hadError = true; |
| ++Index; |
| ++StructuredIndex; |
| return; |
| } |
| |
| // We might know the maximum number of elements in advance. |
| llvm::APSInt maxElements(elementIndex.getBitWidth(), |
| elementIndex.isUnsigned()); |
| bool maxElementsKnown = false; |
| if (const ConstantArrayType *CAT = |
| SemaRef.Context.getAsConstantArrayType(DeclType)) { |
| maxElements = CAT->getSize(); |
| elementIndex.extOrTrunc(maxElements.getBitWidth()); |
| elementIndex.setIsUnsigned(maxElements.isUnsigned()); |
| maxElementsKnown = true; |
| } |
| |
| QualType elementType = SemaRef.Context.getAsArrayType(DeclType) |
| ->getElementType(); |
| while (Index < IList->getNumInits()) { |
| Expr *Init = IList->getInit(Index); |
| if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) { |
| // If we're not the subobject that matches up with the '{' for |
| // the designator, we shouldn't be handling the |
| // designator. Return immediately. |
| if (!SubobjectIsDesignatorContext) |
| return; |
| |
| // Handle this designated initializer. elementIndex will be |
| // updated to be the next array element we'll initialize. |
| if (CheckDesignatedInitializer(Entity, IList, DIE, 0, |
| DeclType, 0, &elementIndex, Index, |
| StructuredList, StructuredIndex, true, |
| false)) { |
| hadError = true; |
| continue; |
| } |
| |
| if (elementIndex.getBitWidth() > maxElements.getBitWidth()) |
| maxElements.extend(elementIndex.getBitWidth()); |
| else if (elementIndex.getBitWidth() < maxElements.getBitWidth()) |
| elementIndex.extend(maxElements.getBitWidth()); |
| elementIndex.setIsUnsigned(maxElements.isUnsigned()); |
| |
| // If the array is of incomplete type, keep track of the number of |
| // elements in the initializer. |
| if (!maxElementsKnown && elementIndex > maxElements) |
| maxElements = elementIndex; |
| |
| continue; |
| } |
| |
| // If we know the maximum number of elements, and we've already |
| // hit it, stop consuming elements in the initializer list. |
| if (maxElementsKnown && elementIndex == maxElements) |
| break; |
| |
| InitializedEntity ElementEntity = |
| InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex, |
| Entity); |
| // Check this element. |
| CheckSubElementType(ElementEntity, IList, elementType, Index, |
| StructuredList, StructuredIndex); |
| ++elementIndex; |
| |
| // If the array is of incomplete type, keep track of the number of |
| // elements in the initializer. |
| if (!maxElementsKnown && elementIndex > maxElements) |
| maxElements = elementIndex; |
| } |
| if (!hadError && DeclType->isIncompleteArrayType()) { |
| // If this is an incomplete array type, the actual type needs to |
| // be calculated here. |
| llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned()); |
| if (maxElements == Zero) { |
| // Sizing an array implicitly to zero is not allowed by ISO C, |
| // but is supported by GNU. |
| SemaRef.Diag(IList->getLocStart(), |
| diag::ext_typecheck_zero_array_size); |
| } |
| |
| DeclType = SemaRef.Context.getConstantArrayType(elementType, maxElements, |
| ArrayType::Normal, 0); |
| } |
| } |
| |
| void InitListChecker::CheckStructUnionTypes(const InitializedEntity &Entity, |
| InitListExpr *IList, |
| QualType DeclType, |
| RecordDecl::field_iterator Field, |
| bool SubobjectIsDesignatorContext, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool TopLevelObject) { |
| RecordDecl* structDecl = DeclType->getAs<RecordType>()->getDecl(); |
| |
| // If the record is invalid, some of it's members are invalid. To avoid |
| // confusion, we forgo checking the intializer for the entire record. |
| if (structDecl->isInvalidDecl()) { |
| hadError = true; |
| return; |
| } |
| |
| if (DeclType->isUnionType() && IList->getNumInits() == 0) { |
| // Value-initialize the first named member of the union. |
| RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl(); |
| for (RecordDecl::field_iterator FieldEnd = RD->field_end(); |
| Field != FieldEnd; ++Field) { |
| if (Field->getDeclName()) { |
| StructuredList->setInitializedFieldInUnion(*Field); |
| break; |
| } |
| } |
| return; |
| } |
| |
| // If structDecl is a forward declaration, this loop won't do |
| // anything except look at designated initializers; That's okay, |
| // because an error should get printed out elsewhere. It might be |
| // worthwhile to skip over the rest of the initializer, though. |
| RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl(); |
| RecordDecl::field_iterator FieldEnd = RD->field_end(); |
| bool InitializedSomething = false; |
| while (Index < IList->getNumInits()) { |
| Expr *Init = IList->getInit(Index); |
| |
| if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) { |
| // If we're not the subobject that matches up with the '{' for |
| // the designator, we shouldn't be handling the |
| // designator. Return immediately. |
| if (!SubobjectIsDesignatorContext) |
| return; |
| |
| // Handle this designated initializer. Field will be updated to |
| // the next field that we'll be initializing. |
| if (CheckDesignatedInitializer(Entity, IList, DIE, 0, |
| DeclType, &Field, 0, Index, |
| StructuredList, StructuredIndex, |
| true, TopLevelObject)) |
| hadError = true; |
| |
| InitializedSomething = true; |
| continue; |
| } |
| |
| if (Field == FieldEnd) { |
| // We've run out of fields. We're done. |
| break; |
| } |
| |
| // We've already initialized a member of a union. We're done. |
| if (InitializedSomething && DeclType->isUnionType()) |
| break; |
| |
| // If we've hit the flexible array member at the end, we're done. |
| if (Field->getType()->isIncompleteArrayType()) |
| break; |
| |
| if (Field->isUnnamedBitfield()) { |
| // Don't initialize unnamed bitfields, e.g. "int : 20;" |
| ++Field; |
| continue; |
| } |
| |
| InitializedEntity MemberEntity = |
| InitializedEntity::InitializeMember(*Field, &Entity); |
| CheckSubElementType(MemberEntity, IList, Field->getType(), Index, |
| StructuredList, StructuredIndex); |
| InitializedSomething = true; |
| |
| if (DeclType->isUnionType()) { |
| // Initialize the first field within the union. |
| StructuredList->setInitializedFieldInUnion(*Field); |
| } |
| |
| ++Field; |
| } |
| |
| if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() || |
| Index >= IList->getNumInits()) |
| return; |
| |
| // Handle GNU flexible array initializers. |
| if (!TopLevelObject && |
| (!isa<InitListExpr>(IList->getInit(Index)) || |
| cast<InitListExpr>(IList->getInit(Index))->getNumInits() > 0)) { |
| SemaRef.Diag(IList->getInit(Index)->getSourceRange().getBegin(), |
| diag::err_flexible_array_init_nonempty) |
| << IList->getInit(Index)->getSourceRange().getBegin(); |
| SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) |
| << *Field; |
| hadError = true; |
| ++Index; |
| return; |
| } else { |
| SemaRef.Diag(IList->getInit(Index)->getSourceRange().getBegin(), |
| diag::ext_flexible_array_init) |
| << IList->getInit(Index)->getSourceRange().getBegin(); |
| SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) |
| << *Field; |
| } |
| |
| InitializedEntity MemberEntity = |
| InitializedEntity::InitializeMember(*Field, &Entity); |
| |
| if (isa<InitListExpr>(IList->getInit(Index))) |
| CheckSubElementType(MemberEntity, IList, Field->getType(), Index, |
| StructuredList, StructuredIndex); |
| else |
| CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index, |
| StructuredList, StructuredIndex); |
| } |
| |
| /// \brief Expand a field designator that refers to a member of an |
| /// anonymous struct or union into a series of field designators that |
| /// refers to the field within the appropriate subobject. |
| /// |
| /// Field/FieldIndex will be updated to point to the (new) |
| /// currently-designated field. |
| static void ExpandAnonymousFieldDesignator(Sema &SemaRef, |
| DesignatedInitExpr *DIE, |
| unsigned DesigIdx, |
| FieldDecl *Field, |
| RecordDecl::field_iterator &FieldIter, |
| unsigned &FieldIndex) { |
| typedef DesignatedInitExpr::Designator Designator; |
| |
| // Build the path from the current object to the member of the |
| // anonymous struct/union (backwards). |
| llvm::SmallVector<FieldDecl *, 4> Path; |
| SemaRef.BuildAnonymousStructUnionMemberPath(Field, Path); |
| |
| // Build the replacement designators. |
| llvm::SmallVector<Designator, 4> Replacements; |
| for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator |
| FI = Path.rbegin(), FIEnd = Path.rend(); |
| FI != FIEnd; ++FI) { |
| if (FI + 1 == FIEnd) |
| Replacements.push_back(Designator((IdentifierInfo *)0, |
| DIE->getDesignator(DesigIdx)->getDotLoc(), |
| DIE->getDesignator(DesigIdx)->getFieldLoc())); |
| else |
| Replacements.push_back(Designator((IdentifierInfo *)0, SourceLocation(), |
| SourceLocation())); |
| Replacements.back().setField(*FI); |
| } |
| |
| // Expand the current designator into the set of replacement |
| // designators, so we have a full subobject path down to where the |
| // member of the anonymous struct/union is actually stored. |
| DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0], |
| &Replacements[0] + Replacements.size()); |
| |
| // Update FieldIter/FieldIndex; |
| RecordDecl *Record = cast<RecordDecl>(Path.back()->getDeclContext()); |
| FieldIter = Record->field_begin(); |
| FieldIndex = 0; |
| for (RecordDecl::field_iterator FEnd = Record->field_end(); |
| FieldIter != FEnd; ++FieldIter) { |
| if (FieldIter->isUnnamedBitfield()) |
| continue; |
| |
| if (*FieldIter == Path.back()) |
| return; |
| |
| ++FieldIndex; |
| } |
| |
| assert(false && "Unable to find anonymous struct/union field"); |
| } |
| |
| /// @brief Check the well-formedness of a C99 designated initializer. |
| /// |
| /// Determines whether the designated initializer @p DIE, which |
| /// resides at the given @p Index within the initializer list @p |
| /// IList, is well-formed for a current object of type @p DeclType |
| /// (C99 6.7.8). The actual subobject that this designator refers to |
| /// within the current subobject is returned in either |
| /// @p NextField or @p NextElementIndex (whichever is appropriate). |
| /// |
| /// @param IList The initializer list in which this designated |
| /// initializer occurs. |
| /// |
| /// @param DIE The designated initializer expression. |
| /// |
| /// @param DesigIdx The index of the current designator. |
| /// |
| /// @param DeclType The type of the "current object" (C99 6.7.8p17), |
| /// into which the designation in @p DIE should refer. |
| /// |
| /// @param NextField If non-NULL and the first designator in @p DIE is |
| /// a field, this will be set to the field declaration corresponding |
| /// to the field named by the designator. |
| /// |
| /// @param NextElementIndex If non-NULL and the first designator in @p |
| /// DIE is an array designator or GNU array-range designator, this |
| /// will be set to the last index initialized by this designator. |
| /// |
| /// @param Index Index into @p IList where the designated initializer |
| /// @p DIE occurs. |
| /// |
| /// @param StructuredList The initializer list expression that |
| /// describes all of the subobject initializers in the order they'll |
| /// actually be initialized. |
| /// |
| /// @returns true if there was an error, false otherwise. |
| bool |
| InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity, |
| InitListExpr *IList, |
| DesignatedInitExpr *DIE, |
| unsigned DesigIdx, |
| QualType &CurrentObjectType, |
| RecordDecl::field_iterator *NextField, |
| llvm::APSInt *NextElementIndex, |
| unsigned &Index, |
| InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| bool FinishSubobjectInit, |
| bool TopLevelObject) { |
| if (DesigIdx == DIE->size()) { |
| // Check the actual initialization for the designated object type. |
| bool prevHadError = hadError; |
| |
| // Temporarily remove the designator expression from the |
| // initializer list that the child calls see, so that we don't try |
| // to re-process the designator. |
| unsigned OldIndex = Index; |
| IList->setInit(OldIndex, DIE->getInit()); |
| |
| CheckSubElementType(Entity, IList, CurrentObjectType, Index, |
| StructuredList, StructuredIndex); |
| |
| // Restore the designated initializer expression in the syntactic |
| // form of the initializer list. |
| if (IList->getInit(OldIndex) != DIE->getInit()) |
| DIE->setInit(IList->getInit(OldIndex)); |
| IList->setInit(OldIndex, DIE); |
| |
| return hadError && !prevHadError; |
| } |
| |
| bool IsFirstDesignator = (DesigIdx == 0); |
| assert((IsFirstDesignator || StructuredList) && |
| "Need a non-designated initializer list to start from"); |
| |
| DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx); |
| // Determine the structural initializer list that corresponds to the |
| // current subobject. |
| StructuredList = IsFirstDesignator? SyntacticToSemantic[IList] |
| : getStructuredSubobjectInit(IList, Index, CurrentObjectType, |
| StructuredList, StructuredIndex, |
| SourceRange(D->getStartLocation(), |
| DIE->getSourceRange().getEnd())); |
| assert(StructuredList && "Expected a structured initializer list"); |
| |
| if (D->isFieldDesignator()) { |
| // C99 6.7.8p7: |
| // |
| // If a designator has the form |
| // |
| // . identifier |
| // |
| // then the current object (defined below) shall have |
| // structure or union type and the identifier shall be the |
| // name of a member of that type. |
| const RecordType *RT = CurrentObjectType->getAs<RecordType>(); |
| if (!RT) { |
| SourceLocation Loc = D->getDotLoc(); |
| if (Loc.isInvalid()) |
| Loc = D->getFieldLoc(); |
| SemaRef.Diag(Loc, diag::err_field_designator_non_aggr) |
| << SemaRef.getLangOptions().CPlusPlus << CurrentObjectType; |
| ++Index; |
| return true; |
| } |
| |
| // Note: we perform a linear search of the fields here, despite |
| // the fact that we have a faster lookup method, because we always |
| // need to compute the field's index. |
| FieldDecl *KnownField = D->getField(); |
| IdentifierInfo *FieldName = D->getFieldName(); |
| unsigned FieldIndex = 0; |
| RecordDecl::field_iterator |
| Field = RT->getDecl()->field_begin(), |
| FieldEnd = RT->getDecl()->field_end(); |
| for (; Field != FieldEnd; ++Field) { |
| if (Field->isUnnamedBitfield()) |
| continue; |
| |
| if (KnownField == *Field || Field->getIdentifier() == FieldName) |
| break; |
| |
| ++FieldIndex; |
| } |
| |
| if (Field == FieldEnd) { |
| // There was no normal field in the struct with the designated |
| // name. Perform another lookup for this name, which may find |
| // something that we can't designate (e.g., a member function), |
| // may find nothing, or may find a member of an anonymous |
| // struct/union. |
| DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName); |
| FieldDecl *ReplacementField = 0; |
| if (Lookup.first == Lookup.second) { |
| // Name lookup didn't find anything. Determine whether this |
| // was a typo for another field name. |
| LookupResult R(SemaRef, FieldName, D->getFieldLoc(), |
| Sema::LookupMemberName); |
| if (SemaRef.CorrectTypo(R, /*Scope=*/0, /*SS=*/0, RT->getDecl()) && |
| (ReplacementField = R.getAsSingle<FieldDecl>()) && |
| ReplacementField->getDeclContext()->getLookupContext() |
| ->Equals(RT->getDecl())) { |
| SemaRef.Diag(D->getFieldLoc(), |
| diag::err_field_designator_unknown_suggest) |
| << FieldName << CurrentObjectType << R.getLookupName() |
| << CodeModificationHint::CreateReplacement(D->getFieldLoc(), |
| R.getLookupName().getAsString()); |
| SemaRef.Diag(ReplacementField->getLocation(), |
| diag::note_previous_decl) |
| << ReplacementField->getDeclName(); |
| } else { |
| SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown) |
| << FieldName << CurrentObjectType; |
| ++Index; |
| return true; |
| } |
| } else if (!KnownField) { |
| // Determine whether we found a field at all. |
| ReplacementField = dyn_cast<FieldDecl>(*Lookup.first); |
| } |
| |
| if (!ReplacementField) { |
| // Name lookup found something, but it wasn't a field. |
| SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield) |
| << FieldName; |
| SemaRef.Diag((*Lookup.first)->getLocation(), |
| diag::note_field_designator_found); |
| ++Index; |
| return true; |
| } |
| |
| if (!KnownField && |
| cast<RecordDecl>((ReplacementField)->getDeclContext()) |
| ->isAnonymousStructOrUnion()) { |
| // Handle an field designator that refers to a member of an |
| // anonymous struct or union. |
| ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, |
| ReplacementField, |
| Field, FieldIndex); |
| D = DIE->getDesignator(DesigIdx); |
| } else if (!KnownField) { |
| // The replacement field comes from typo correction; find it |
| // in the list of fields. |
| FieldIndex = 0; |
| Field = RT->getDecl()->field_begin(); |
| for (; Field != FieldEnd; ++Field) { |
| if (Field->isUnnamedBitfield()) |
| continue; |
| |
| if (ReplacementField == *Field || |
| Field->getIdentifier() == ReplacementField->getIdentifier()) |
| break; |
| |
| ++FieldIndex; |
| } |
| } |
| } else if (!KnownField && |
| cast<RecordDecl>((*Field)->getDeclContext()) |
| ->isAnonymousStructOrUnion()) { |
| ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, *Field, |
| Field, FieldIndex); |
| D = DIE->getDesignator(DesigIdx); |
| } |
| |
| // All of the fields of a union are located at the same place in |
| // the initializer list. |
| if (RT->getDecl()->isUnion()) { |
| FieldIndex = 0; |
| StructuredList->setInitializedFieldInUnion(*Field); |
| } |
| |
| // Update the designator with the field declaration. |
| D->setField(*Field); |
| |
| // Make sure that our non-designated initializer list has space |
| // for a subobject corresponding to this field. |
| if (FieldIndex >= StructuredList->getNumInits()) |
| StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1); |
| |
| // This designator names a flexible array member. |
| if (Field->getType()->isIncompleteArrayType()) { |
| bool Invalid = false; |
| if ((DesigIdx + 1) != DIE->size()) { |
| // We can't designate an object within the flexible array |
| // member (because GCC doesn't allow it). |
| DesignatedInitExpr::Designator *NextD |
| = DIE->getDesignator(DesigIdx + 1); |
| SemaRef.Diag(NextD->getStartLocation(), |
| diag::err_designator_into_flexible_array_member) |
| << SourceRange(NextD->getStartLocation(), |
| DIE->getSourceRange().getEnd()); |
| SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) |
| << *Field; |
| Invalid = true; |
| } |
| |
| if (!hadError && !isa<InitListExpr>(DIE->getInit())) { |
| // The initializer is not an initializer list. |
| SemaRef.Diag(DIE->getInit()->getSourceRange().getBegin(), |
| diag::err_flexible_array_init_needs_braces) |
| << DIE->getInit()->getSourceRange(); |
| SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) |
| << *Field; |
| Invalid = true; |
| } |
| |
| // Handle GNU flexible array initializers. |
| if (!Invalid && !TopLevelObject && |
| cast<InitListExpr>(DIE->getInit())->getNumInits() > 0) { |
| SemaRef.Diag(DIE->getSourceRange().getBegin(), |
| diag::err_flexible_array_init_nonempty) |
| << DIE->getSourceRange().getBegin(); |
| SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) |
| << *Field; |
| Invalid = true; |
| } |
| |
| if (Invalid) { |
| ++Index; |
| return true; |
| } |
| |
| // Initialize the array. |
| bool prevHadError = hadError; |
| unsigned newStructuredIndex = FieldIndex; |
| unsigned OldIndex = Index; |
| IList->setInit(Index, DIE->getInit()); |
| |
| InitializedEntity MemberEntity = |
| InitializedEntity::InitializeMember(*Field, &Entity); |
| CheckSubElementType(MemberEntity, IList, Field->getType(), Index, |
| StructuredList, newStructuredIndex); |
| |
| IList->setInit(OldIndex, DIE); |
| if (hadError && !prevHadError) { |
| ++Field; |
| ++FieldIndex; |
| if (NextField) |
| *NextField = Field; |
| StructuredIndex = FieldIndex; |
| return true; |
| } |
| } else { |
| // Recurse to check later designated subobjects. |
| QualType FieldType = (*Field)->getType(); |
| unsigned newStructuredIndex = FieldIndex; |
| |
| InitializedEntity MemberEntity = |
| InitializedEntity::InitializeMember(*Field, &Entity); |
| if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1, |
| FieldType, 0, 0, Index, |
| StructuredList, newStructuredIndex, |
| true, false)) |
| return true; |
| } |
| |
| // Find the position of the next field to be initialized in this |
| // subobject. |
| ++Field; |
| ++FieldIndex; |
| |
| // If this the first designator, our caller will continue checking |
| // the rest of this struct/class/union subobject. |
| if (IsFirstDesignator) { |
| if (NextField) |
| *NextField = Field; |
| StructuredIndex = FieldIndex; |
| return false; |
| } |
| |
| if (!FinishSubobjectInit) |
| return false; |
| |
| // We've already initialized something in the union; we're done. |
| if (RT->getDecl()->isUnion()) |
| return hadError; |
| |
| // Check the remaining fields within this class/struct/union subobject. |
| bool prevHadError = hadError; |
| |
| CheckStructUnionTypes(Entity, IList, CurrentObjectType, Field, false, Index, |
| StructuredList, FieldIndex); |
| return hadError && !prevHadError; |
| } |
| |
| // C99 6.7.8p6: |
| // |
| // If a designator has the form |
| // |
| // [ constant-expression ] |
| // |
| // then the current object (defined below) shall have array |
| // type and the expression shall be an integer constant |
| // expression. If the array is of unknown size, any |
| // nonnegative value is valid. |
| // |
| // Additionally, cope with the GNU extension that permits |
| // designators of the form |
| // |
| // [ constant-expression ... constant-expression ] |
| const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType); |
| if (!AT) { |
| SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array) |
| << CurrentObjectType; |
| ++Index; |
| return true; |
| } |
| |
| Expr *IndexExpr = 0; |
| llvm::APSInt DesignatedStartIndex, DesignatedEndIndex; |
| if (D->isArrayDesignator()) { |
| IndexExpr = DIE->getArrayIndex(*D); |
| DesignatedStartIndex = IndexExpr->EvaluateAsInt(SemaRef.Context); |
| DesignatedEndIndex = DesignatedStartIndex; |
| } else { |
| assert(D->isArrayRangeDesignator() && "Need array-range designator"); |
| |
| |
| DesignatedStartIndex = |
| DIE->getArrayRangeStart(*D)->EvaluateAsInt(SemaRef.Context); |
| DesignatedEndIndex = |
| DIE->getArrayRangeEnd(*D)->EvaluateAsInt(SemaRef.Context); |
| IndexExpr = DIE->getArrayRangeEnd(*D); |
| |
| if (DesignatedStartIndex.getZExtValue() !=DesignatedEndIndex.getZExtValue()) |
| FullyStructuredList->sawArrayRangeDesignator(); |
| } |
| |
| if (isa<ConstantArrayType>(AT)) { |
| llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false); |
| DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth()); |
| DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned()); |
| DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth()); |
| DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned()); |
| if (DesignatedEndIndex >= MaxElements) { |
| SemaRef.Diag(IndexExpr->getSourceRange().getBegin(), |
| diag::err_array_designator_too_large) |
| << DesignatedEndIndex.toString(10) << MaxElements.toString(10) |
| << IndexExpr->getSourceRange(); |
| ++Index; |
| return true; |
| } |
| } else { |
| // Make sure the bit-widths and signedness match. |
| if (DesignatedStartIndex.getBitWidth() > DesignatedEndIndex.getBitWidth()) |
| DesignatedEndIndex.extend(DesignatedStartIndex.getBitWidth()); |
| else if (DesignatedStartIndex.getBitWidth() < |
| DesignatedEndIndex.getBitWidth()) |
| DesignatedStartIndex.extend(DesignatedEndIndex.getBitWidth()); |
| DesignatedStartIndex.setIsUnsigned(true); |
| DesignatedEndIndex.setIsUnsigned(true); |
| } |
| |
| // Make sure that our non-designated initializer list has space |
| // for a subobject corresponding to this array element. |
| if (DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits()) |
| StructuredList->resizeInits(SemaRef.Context, |
| DesignatedEndIndex.getZExtValue() + 1); |
| |
| // Repeatedly perform subobject initializations in the range |
| // [DesignatedStartIndex, DesignatedEndIndex]. |
| |
| // Move to the next designator |
| unsigned ElementIndex = DesignatedStartIndex.getZExtValue(); |
| unsigned OldIndex = Index; |
| |
| InitializedEntity ElementEntity = |
| InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); |
| |
| while (DesignatedStartIndex <= DesignatedEndIndex) { |
| // Recurse to check later designated subobjects. |
| QualType ElementType = AT->getElementType(); |
| Index = OldIndex; |
| |
| ElementEntity.setElementIndex(ElementIndex); |
| if (CheckDesignatedInitializer(ElementEntity, IList, DIE, DesigIdx + 1, |
| ElementType, 0, 0, Index, |
| StructuredList, ElementIndex, |
| (DesignatedStartIndex == DesignatedEndIndex), |
| false)) |
| return true; |
| |
| // Move to the next index in the array that we'll be initializing. |
| ++DesignatedStartIndex; |
| ElementIndex = DesignatedStartIndex.getZExtValue(); |
| } |
| |
| // If this the first designator, our caller will continue checking |
| // the rest of this array subobject. |
| if (IsFirstDesignator) { |
| if (NextElementIndex) |
| *NextElementIndex = DesignatedStartIndex; |
| StructuredIndex = ElementIndex; |
| return false; |
| } |
| |
| if (!FinishSubobjectInit) |
| return false; |
| |
| // Check the remaining elements within this array subobject. |
| bool prevHadError = hadError; |
| CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex, |
| /*SubobjectIsDesignatorContext=*/false, Index, |
| StructuredList, ElementIndex); |
| return hadError && !prevHadError; |
| } |
| |
| // Get the structured initializer list for a subobject of type |
| // @p CurrentObjectType. |
| InitListExpr * |
| InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index, |
| QualType CurrentObjectType, |
| InitListExpr *StructuredList, |
| unsigned StructuredIndex, |
| SourceRange InitRange) { |
| Expr *ExistingInit = 0; |
| if (!StructuredList) |
| ExistingInit = SyntacticToSemantic[IList]; |
| else if (StructuredIndex < StructuredList->getNumInits()) |
| ExistingInit = StructuredList->getInit(StructuredIndex); |
| |
| if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit)) |
| return Result; |
| |
| if (ExistingInit) { |
| // We are creating an initializer list that initializes the |
| // subobjects of the current object, but there was already an |
| // initialization that completely initialized the current |
| // subobject, e.g., by a compound literal: |
| // |
| // struct X { int a, b; }; |
| // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 }; |
| // |
| // Here, xs[0].a == 0 and xs[0].b == 3, since the second, |
| // designated initializer re-initializes the whole |
| // subobject [0], overwriting previous initializers. |
| SemaRef.Diag(InitRange.getBegin(), |
| diag::warn_subobject_initializer_overrides) |
| << InitRange; |
| SemaRef.Diag(ExistingInit->getSourceRange().getBegin(), |
| diag::note_previous_initializer) |
| << /*FIXME:has side effects=*/0 |
| << ExistingInit->getSourceRange(); |
| } |
| |
| InitListExpr *Result |
| = new (SemaRef.Context) InitListExpr(InitRange.getBegin(), 0, 0, |
| InitRange.getEnd()); |
| |
| Result->setType(CurrentObjectType); |
| |
| // Pre-allocate storage for the structured initializer list. |
| unsigned NumElements = 0; |
| unsigned NumInits = 0; |
| if (!StructuredList) |
| NumInits = IList->getNumInits(); |
| else if (Index < IList->getNumInits()) { |
| if (InitListExpr *SubList = dyn_cast<InitListExpr>(IList->getInit(Index))) |
| NumInits = SubList->getNumInits(); |
| } |
| |
| if (const ArrayType *AType |
| = SemaRef.Context.getAsArrayType(CurrentObjectType)) { |
| if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) { |
| NumElements = CAType->getSize().getZExtValue(); |
| // Simple heuristic so that we don't allocate a very large |
| // initializer with many empty entries at the end. |
| if (NumInits && NumElements > NumInits) |
| NumElements = 0; |
| } |
| } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>()) |
| NumElements = VType->getNumElements(); |
| else if (const RecordType *RType = CurrentObjectType->getAs<RecordType>()) { |
| RecordDecl *RDecl = RType->getDecl(); |
| if (RDecl->isUnion()) |
| NumElements = 1; |
| else |
| NumElements = std::distance(RDecl->field_begin(), |
| RDecl->field_end()); |
| } |
| |
| if (NumElements < NumInits) |
| NumElements = IList->getNumInits(); |
| |
| Result->reserveInits(NumElements); |
| |
| // Link this new initializer list into the structured initializer |
| // lists. |
| if (StructuredList) |
| StructuredList->updateInit(StructuredIndex, Result); |
| else { |
| Result->setSyntacticForm(IList); |
| SyntacticToSemantic[IList] = Result; |
| } |
| |
| return Result; |
| } |
| |
| /// Update the initializer at index @p StructuredIndex within the |
| /// structured initializer list to the value @p expr. |
| void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList, |
| unsigned &StructuredIndex, |
| Expr *expr) { |
| // No structured initializer list to update |
| if (!StructuredList) |
| return; |
| |
| if (Expr *PrevInit = StructuredList->updateInit(StructuredIndex, expr)) { |
| // This initializer overwrites a previous initializer. Warn. |
| SemaRef.Diag(expr->getSourceRange().getBegin(), |
| diag::warn_initializer_overrides) |
| << expr->getSourceRange(); |
| SemaRef.Diag(PrevInit->getSourceRange().getBegin(), |
| diag::note_previous_initializer) |
| << /*FIXME:has side effects=*/0 |
| << PrevInit->getSourceRange(); |
| } |
| |
| ++StructuredIndex; |
| } |
| |
| /// Check that the given Index expression is a valid array designator |
| /// value. This is essentailly just a wrapper around |
| /// VerifyIntegerConstantExpression that also checks for negative values |
| /// and produces a reasonable diagnostic if there is a |
| /// failure. Returns true if there was an error, false otherwise. If |
| /// everything went okay, Value will receive the value of the constant |
| /// expression. |
| static bool |
| CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) { |
| SourceLocation Loc = Index->getSourceRange().getBegin(); |
| |
| // Make sure this is an integer constant expression. |
| if (S.VerifyIntegerConstantExpression(Index, &Value)) |
| return true; |
| |
| if (Value.isSigned() && Value.isNegative()) |
| return S.Diag(Loc, diag::err_array_designator_negative) |
| << Value.toString(10) << Index->getSourceRange(); |
| |
| Value.setIsUnsigned(true); |
| return false; |
| } |
| |
| Sema::OwningExprResult Sema::ActOnDesignatedInitializer(Designation &Desig, |
| SourceLocation Loc, |
| bool GNUSyntax, |
| OwningExprResult Init) { |
| typedef DesignatedInitExpr::Designator ASTDesignator; |
| |
| bool Invalid = false; |
| llvm::SmallVector<ASTDesignator, 32> Designators; |
| llvm::SmallVector<Expr *, 32> InitExpressions; |
| |
| // Build designators and check array designator expressions. |
| for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) { |
| const Designator &D = Desig.getDesignator(Idx); |
| switch (D.getKind()) { |
| case Designator::FieldDesignator: |
| Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(), |
| D.getFieldLoc())); |
| break; |
| |
| case Designator::ArrayDesignator: { |
| Expr *Index = static_cast<Expr *>(D.getArrayIndex()); |
| llvm::APSInt IndexValue; |
| if (!Index->isTypeDependent() && |
| !Index->isValueDependent() && |
| CheckArrayDesignatorExpr(*this, Index, IndexValue)) |
| Invalid = true; |
| else { |
| Designators.push_back(ASTDesignator(InitExpressions.size(), |
| D.getLBracketLoc(), |
| D.getRBracketLoc())); |
| InitExpressions.push_back(Index); |
| } |
| break; |
| } |
| |
| case Designator::ArrayRangeDesignator: { |
| Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart()); |
| Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd()); |
| llvm::APSInt StartValue; |
| llvm::APSInt EndValue; |
| bool StartDependent = StartIndex->isTypeDependent() || |
| StartIndex->isValueDependent(); |
| bool EndDependent = EndIndex->isTypeDependent() || |
| EndIndex->isValueDependent(); |
| if ((!StartDependent && |
| CheckArrayDesignatorExpr(*this, StartIndex, StartValue)) || |
| (!EndDependent && |
| CheckArrayDesignatorExpr(*this, EndIndex, EndValue))) |
| Invalid = true; |
| else { |
| // Make sure we're comparing values with the same bit width. |
| if (StartDependent || EndDependent) { |
| // Nothing to compute. |
| } else if (StartValue.getBitWidth() > EndValue.getBitWidth()) |
| EndValue.extend(StartValue.getBitWidth()); |
| else if (StartValue.getBitWidth() < EndValue.getBitWidth()) |
| StartValue.extend(EndValue.getBitWidth()); |
| |
| if (!StartDependent && !EndDependent && EndValue < StartValue) { |
| Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range) |
| << StartValue.toString(10) << EndValue.toString(10) |
| << StartIndex->getSourceRange() << EndIndex->getSourceRange(); |
| Invalid = true; |
| } else { |
| Designators.push_back(ASTDesignator(InitExpressions.size(), |
| D.getLBracketLoc(), |
| D.getEllipsisLoc(), |
| D.getRBracketLoc())); |
| InitExpressions.push_back(StartIndex); |
| InitExpressions.push_back(EndIndex); |
| } |
| } |
| break; |
| } |
| } |
| } |
| |
| if (Invalid || Init.isInvalid()) |
| return ExprError(); |
| |
| // Clear out the expressions within the designation. |
| Desig.ClearExprs(*this); |
| |
| DesignatedInitExpr *DIE |
| = DesignatedInitExpr::Create(Context, |
| Designators.data(), Designators.size(), |
| InitExpressions.data(), InitExpressions.size(), |
| Loc, GNUSyntax, Init.takeAs<Expr>()); |
| return Owned(DIE); |
| } |
| |
| bool Sema::CheckInitList(const InitializedEntity &Entity, |
| InitListExpr *&InitList, QualType &DeclType) { |
| InitListChecker CheckInitList(*this, Entity, InitList, DeclType); |
| if (!CheckInitList.HadError()) |
| InitList = CheckInitList.getFullyStructuredList(); |
| |
| return CheckInitList.HadError(); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Initialization entity |
| //===----------------------------------------------------------------------===// |
| |
| InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index, |
| const InitializedEntity &Parent) |
| : Parent(&Parent), Index(Index) |
| { |
| if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) { |
| Kind = EK_ArrayElement; |
| Type = AT->getElementType(); |
| } else { |
| Kind = EK_VectorElement; |
| Type = Parent.getType()->getAs<VectorType>()->getElementType(); |
| } |
| } |
| |
| InitializedEntity InitializedEntity::InitializeBase(ASTContext &Context, |
| CXXBaseSpecifier *Base) |
| { |
| InitializedEntity Result; |
| Result.Kind = EK_Base; |
| Result.Base = Base; |
| Result.Type = Base->getType(); |
| return Result; |
| } |
| |
| DeclarationName InitializedEntity::getName() const { |
| switch (getKind()) { |
| case EK_Parameter: |
| if (!VariableOrMember) |
| return DeclarationName(); |
| // Fall through |
| |
| case EK_Variable: |
| case EK_Member: |
| return VariableOrMember->getDeclName(); |
| |
| case EK_Result: |
| case EK_Exception: |
| case EK_New: |
| case EK_Temporary: |
| case EK_Base: |
| case EK_ArrayElement: |
| case EK_VectorElement: |
| return DeclarationName(); |
| } |
| |
| // Silence GCC warning |
| return DeclarationName(); |
| } |
| |
| DeclaratorDecl *InitializedEntity::getDecl() const { |
| switch (getKind()) { |
| case EK_Variable: |
| case EK_Parameter: |
| case EK_Member: |
| return VariableOrMember; |
| |
| case EK_Result: |
| case EK_Exception: |
| case EK_New: |
| case EK_Temporary: |
| case EK_Base: |
| case EK_ArrayElement: |
| case EK_VectorElement: |
| return 0; |
| } |
| |
| // Silence GCC warning |
| return 0; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Initialization sequence |
| //===----------------------------------------------------------------------===// |
| |
| void InitializationSequence::Step::Destroy() { |
| switch (Kind) { |
| case SK_ResolveAddressOfOverloadedFunction: |
| case SK_CastDerivedToBaseRValue: |
| case SK_CastDerivedToBaseLValue: |
| case SK_BindReference: |
| case SK_BindReferenceToTemporary: |
| case SK_UserConversion: |
| case SK_QualificationConversionRValue: |
| case SK_QualificationConversionLValue: |
| case SK_ListInitialization: |
| case SK_ConstructorInitialization: |
| case SK_ZeroInitialization: |
| case SK_CAssignment: |
| case SK_StringInit: |
| break; |
| |
| case SK_ConversionSequence: |
| delete ICS; |
| } |
| } |
| |
| void InitializationSequence::AddAddressOverloadResolutionStep( |
| FunctionDecl *Function) { |
| Step S; |
| S.Kind = SK_ResolveAddressOfOverloadedFunction; |
| S.Type = Function->getType(); |
| // Access is currently ignored for these. |
| S.Function = DeclAccessPair::make(Function, AccessSpecifier(0)); |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType, |
| bool IsLValue) { |
| Step S; |
| S.Kind = IsLValue? SK_CastDerivedToBaseLValue : SK_CastDerivedToBaseRValue; |
| S.Type = BaseType; |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddReferenceBindingStep(QualType T, |
| bool BindingTemporary) { |
| Step S; |
| S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference; |
| S.Type = T; |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddUserConversionStep(FunctionDecl *Function, |
| AccessSpecifier Access, |
| QualType T) { |
| Step S; |
| S.Kind = SK_UserConversion; |
| S.Type = T; |
| S.Function = DeclAccessPair::make(Function, Access); |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddQualificationConversionStep(QualType Ty, |
| bool IsLValue) { |
| Step S; |
| S.Kind = IsLValue? SK_QualificationConversionLValue |
| : SK_QualificationConversionRValue; |
| S.Type = Ty; |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddConversionSequenceStep( |
| const ImplicitConversionSequence &ICS, |
| QualType T) { |
| Step S; |
| S.Kind = SK_ConversionSequence; |
| S.Type = T; |
| S.ICS = new ImplicitConversionSequence(ICS); |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddListInitializationStep(QualType T) { |
| Step S; |
| S.Kind = SK_ListInitialization; |
| S.Type = T; |
| Steps.push_back(S); |
| } |
| |
| void |
| InitializationSequence::AddConstructorInitializationStep( |
| CXXConstructorDecl *Constructor, |
| AccessSpecifier Access, |
| QualType T) { |
| Step S; |
| S.Kind = SK_ConstructorInitialization; |
| S.Type = T; |
| S.Function = DeclAccessPair::make(Constructor, Access); |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddZeroInitializationStep(QualType T) { |
| Step S; |
| S.Kind = SK_ZeroInitialization; |
| S.Type = T; |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddCAssignmentStep(QualType T) { |
| Step S; |
| S.Kind = SK_CAssignment; |
| S.Type = T; |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::AddStringInitStep(QualType T) { |
| Step S; |
| S.Kind = SK_StringInit; |
| S.Type = T; |
| Steps.push_back(S); |
| } |
| |
| void InitializationSequence::SetOverloadFailure(FailureKind Failure, |
| OverloadingResult Result) { |
| SequenceKind = FailedSequence; |
| this->Failure = Failure; |
| this->FailedOverloadResult = Result; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Attempt initialization |
| //===----------------------------------------------------------------------===// |
| |
| /// \brief Attempt list initialization (C++0x [dcl.init.list]) |
| static void TryListInitialization(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| InitListExpr *InitList, |
| InitializationSequence &Sequence) { |
| // FIXME: We only perform rudimentary checking of list |
| // initializations at this point, then assume that any list |
| // initialization of an array, aggregate, or scalar will be |
| // well-formed. We we actually "perform" list initialization, we'll |
| // do all of the necessary checking. C++0x initializer lists will |
| // force us to perform more checking here. |
| Sequence.setSequenceKind(InitializationSequence::ListInitialization); |
| |
| QualType DestType = Entity.getType(); |
| |
| // C++ [dcl.init]p13: |
| // If T is a scalar type, then a declaration of the form |
| // |
| // T x = { a }; |
| // |
| // is equivalent to |
| // |
| // T x = a; |
| if (DestType->isScalarType()) { |
| if (InitList->getNumInits() > 1 && S.getLangOptions().CPlusPlus) { |
| Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar); |
| return; |
| } |
| |
| // Assume scalar initialization from a single value works. |
| } else if (DestType->isAggregateType()) { |
| // Assume aggregate initialization works. |
| } else if (DestType->isVectorType()) { |
| // Assume vector initialization works. |
| } else if (DestType->isReferenceType()) { |
| // FIXME: C++0x defines behavior for this. |
| Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList); |
| return; |
| } else if (DestType->isRecordType()) { |
| // FIXME: C++0x defines behavior for this |
| Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType); |
| } |
| |
| // Add a general "list initialization" step. |
| Sequence.AddListInitializationStep(DestType); |
| } |
| |
| /// \brief Try a reference initialization that involves calling a conversion |
| /// function. |
| /// |
| /// FIXME: look intos DRs 656, 896 |
| static OverloadingResult TryRefInitWithConversionFunction(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr *Initializer, |
| bool AllowRValues, |
| InitializationSequence &Sequence) { |
| QualType DestType = Entity.getType(); |
| QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType(); |
| QualType T1 = cv1T1.getUnqualifiedType(); |
| QualType cv2T2 = Initializer->getType(); |
| QualType T2 = cv2T2.getUnqualifiedType(); |
| |
| bool DerivedToBase; |
| assert(!S.CompareReferenceRelationship(Initializer->getLocStart(), |
| T1, T2, DerivedToBase) && |
| "Must have incompatible references when binding via conversion"); |
| (void)DerivedToBase; |
| |
| // Build the candidate set directly in the initialization sequence |
| // structure, so that it will persist if we fail. |
| OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet(); |
| CandidateSet.clear(); |
| |
| // Determine whether we are allowed to call explicit constructors or |
| // explicit conversion operators. |
| bool AllowExplicit = Kind.getKind() == InitializationKind::IK_Direct; |
| |
| const RecordType *T1RecordType = 0; |
| if (AllowRValues && (T1RecordType = T1->getAs<RecordType>())) { |
| // The type we're converting to is a class type. Enumerate its constructors |
| // to see if there is a suitable conversion. |
| CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl()); |
| |
| DeclarationName ConstructorName |
| = S.Context.DeclarationNames.getCXXConstructorName( |
| S.Context.getCanonicalType(T1).getUnqualifiedType()); |
| DeclContext::lookup_iterator Con, ConEnd; |
| for (llvm::tie(Con, ConEnd) = T1RecordDecl->lookup(ConstructorName); |
| Con != ConEnd; ++Con) { |
| // Find the constructor (which may be a template). |
| CXXConstructorDecl *Constructor = 0; |
| FunctionTemplateDecl *ConstructorTmpl |
| = dyn_cast<FunctionTemplateDecl>(*Con); |
| if (ConstructorTmpl) |
| Constructor = cast<CXXConstructorDecl>( |
| ConstructorTmpl->getTemplatedDecl()); |
| else |
| Constructor = cast<CXXConstructorDecl>(*Con); |
| |
| if (!Constructor->isInvalidDecl() && |
| Constructor->isConvertingConstructor(AllowExplicit)) { |
| if (ConstructorTmpl) |
| S.AddTemplateOverloadCandidate(ConstructorTmpl, |
| ConstructorTmpl->getAccess(), |
| /*ExplicitArgs*/ 0, |
| &Initializer, 1, CandidateSet); |
| else |
| S.AddOverloadCandidate(Constructor, Constructor->getAccess(), |
| &Initializer, 1, CandidateSet); |
| } |
| } |
| } |
| |
| if (const RecordType *T2RecordType = T2->getAs<RecordType>()) { |
| // The type we're converting from is a class type, enumerate its conversion |
| // functions. |
| CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl()); |
| |
| // Determine the type we are converting to. If we are allowed to |
| // convert to an rvalue, take the type that the destination type |
| // refers to. |
| QualType ToType = AllowRValues? cv1T1 : DestType; |
| |
| const UnresolvedSetImpl *Conversions |
| = T2RecordDecl->getVisibleConversionFunctions(); |
| for (UnresolvedSetImpl::const_iterator I = Conversions->begin(), |
| E = Conversions->end(); I != E; ++I) { |
| NamedDecl *D = *I; |
| CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); |
| if (isa<UsingShadowDecl>(D)) |
| D = cast<UsingShadowDecl>(D)->getTargetDecl(); |
| |
| FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D); |
| CXXConversionDecl *Conv; |
| if (ConvTemplate) |
| Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); |
| else |
| Conv = cast<CXXConversionDecl>(*I); |
| |
| // If the conversion function doesn't return a reference type, |
| // it can't be considered for this conversion unless we're allowed to |
| // consider rvalues. |
| // FIXME: Do we need to make sure that we only consider conversion |
| // candidates with reference-compatible results? That might be needed to |
| // break recursion. |
| if ((AllowExplicit || !Conv->isExplicit()) && |
| (AllowRValues || Conv->getConversionType()->isLValueReferenceType())){ |
| if (ConvTemplate) |
| S.AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), |
| ActingDC, Initializer, |
| ToType, CandidateSet); |
| else |
| S.AddConversionCandidate(Conv, I.getAccess(), ActingDC, |
| Initializer, cv1T1, CandidateSet); |
| } |
| } |
| } |
| |
| SourceLocation DeclLoc = Initializer->getLocStart(); |
| |
| // Perform overload resolution. If it fails, return the failed result. |
| OverloadCandidateSet::iterator Best; |
| if (OverloadingResult Result |
| = S.BestViableFunction(CandidateSet, DeclLoc, Best)) |
| return Result; |
| |
| FunctionDecl *Function = Best->Function; |
| |
| // Compute the returned type of the conversion. |
| if (isa<CXXConversionDecl>(Function)) |
| T2 = Function->getResultType(); |
| else |
| T2 = cv1T1; |
| |
| // Add the user-defined conversion step. |
| Sequence.AddUserConversionStep(Function, Best->getAccess(), |
| T2.getNonReferenceType()); |
| |
| // Determine whether we need to perform derived-to-base or |
| // cv-qualification adjustments. |
| bool NewDerivedToBase = false; |
| Sema::ReferenceCompareResult NewRefRelationship |
| = S.CompareReferenceRelationship(DeclLoc, T1, T2.getNonReferenceType(), |
| NewDerivedToBase); |
| assert(NewRefRelationship != Sema::Ref_Incompatible && |
| "Overload resolution picked a bad conversion function"); |
| (void)NewRefRelationship; |
| if (NewDerivedToBase) |
| Sequence.AddDerivedToBaseCastStep( |
| S.Context.getQualifiedType(T1, |
| T2.getNonReferenceType().getQualifiers()), |
| /*isLValue=*/true); |
| |
| if (cv1T1.getQualifiers() != T2.getNonReferenceType().getQualifiers()) |
| Sequence.AddQualificationConversionStep(cv1T1, T2->isReferenceType()); |
| |
| Sequence.AddReferenceBindingStep(cv1T1, !T2->isReferenceType()); |
| return OR_Success; |
| } |
| |
| /// \brief Attempt reference initialization (C++0x [dcl.init.list]) |
| static void TryReferenceInitialization(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr *Initializer, |
| InitializationSequence &Sequence) { |
| Sequence.setSequenceKind(InitializationSequence::ReferenceBinding); |
| |
| QualType DestType = Entity.getType(); |
| QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType(); |
| Qualifiers T1Quals; |
| QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals); |
| QualType cv2T2 = Initializer->getType(); |
| Qualifiers T2Quals; |
| QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals); |
| SourceLocation DeclLoc = Initializer->getLocStart(); |
| |
| // If the initializer is the address of an overloaded function, try |
| // to resolve the overloaded function. If all goes well, T2 is the |
| // type of the resulting function. |
| if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy) { |
| FunctionDecl *Fn = S.ResolveAddressOfOverloadedFunction(Initializer, |
| T1, |
| false); |
| if (!Fn) { |
| Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed); |
| return; |
| } |
| |
| Sequence.AddAddressOverloadResolutionStep(Fn); |
| cv2T2 = Fn->getType(); |
| T2 = cv2T2.getUnqualifiedType(); |
| } |
| |
| // FIXME: Rvalue references |
| bool ForceRValue = false; |
| |
| // Compute some basic properties of the types and the initializer. |
| bool isLValueRef = DestType->isLValueReferenceType(); |
| bool isRValueRef = !isLValueRef; |
| bool DerivedToBase = false; |
| Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : |
| Initializer->isLvalue(S.Context); |
| Sema::ReferenceCompareResult RefRelationship |
| = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, DerivedToBase); |
| |
| // C++0x [dcl.init.ref]p5: |
| // A reference to type "cv1 T1" is initialized by an expression of type |
| // "cv2 T2" as follows: |
| // |
| // - If the reference is an lvalue reference and the initializer |
| // expression |
| OverloadingResult ConvOvlResult = OR_Success; |
| if (isLValueRef) { |
| if (InitLvalue == Expr::LV_Valid && |
| RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification) { |
| // - is an lvalue (but is not a bit-field), and "cv1 T1" is |
| // reference-compatible with "cv2 T2," or |
| // |
| // Per C++ [over.best.ics]p2, we don't diagnose whether the lvalue is a |
| // bit-field when we're determining whether the reference initialization |
| // can occur. However, we do pay attention to whether it is a bit-field |
| // to decide whether we're actually binding to a temporary created from |
| // the bit-field. |
| if (DerivedToBase) |
| Sequence.AddDerivedToBaseCastStep( |
| S.Context.getQualifiedType(T1, T2Quals), |
| /*isLValue=*/true); |
| if (T1Quals != T2Quals) |
| Sequence.AddQualificationConversionStep(cv1T1, /*IsLValue=*/true); |
| bool BindingTemporary = T1Quals.hasConst() && !T1Quals.hasVolatile() && |
| (Initializer->getBitField() || Initializer->refersToVectorElement()); |
| Sequence.AddReferenceBindingStep(cv1T1, BindingTemporary); |
| return; |
| } |
| |
| // - has a class type (i.e., T2 is a class type), where T1 is not |
| // reference-related to T2, and can be implicitly converted to an |
| // lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible |
| // with "cv3 T3" (this conversion is selected by enumerating the |
| // applicable conversion functions (13.3.1.6) and choosing the best |
| // one through overload resolution (13.3)), |
| if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType()) { |
| ConvOvlResult = TryRefInitWithConversionFunction(S, Entity, Kind, |
| Initializer, |
| /*AllowRValues=*/false, |
| Sequence); |
| if (ConvOvlResult == OR_Success) |
| return; |
| if (ConvOvlResult != OR_No_Viable_Function) { |
| Sequence.SetOverloadFailure( |
| InitializationSequence::FK_ReferenceInitOverloadFailed, |
| ConvOvlResult); |
| } |
| } |
| } |
| |
| // - Otherwise, the reference shall be an lvalue reference to a |
| // non-volatile const type (i.e., cv1 shall be const), or the reference |
| // shall be an rvalue reference and the initializer expression shall |
| // be an rvalue. |
| if (!((isLValueRef && T1Quals.hasConst() && !T1Quals.hasVolatile()) || |
| (isRValueRef && InitLvalue != Expr::LV_Valid))) { |
| if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty()) |
| Sequence.SetOverloadFailure( |
| InitializationSequence::FK_ReferenceInitOverloadFailed, |
| ConvOvlResult); |
| else if (isLValueRef) |
| Sequence.SetFailed(InitLvalue == Expr::LV_Valid |
| ? (RefRelationship == Sema::Ref_Related |
| ? InitializationSequence::FK_ReferenceInitDropsQualifiers |
| : InitializationSequence::FK_NonConstLValueReferenceBindingToUnrelated) |
| : InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary); |
| else |
| Sequence.SetFailed( |
| InitializationSequence::FK_RValueReferenceBindingToLValue); |
| |
| return; |
| } |
| |
| // - If T1 and T2 are class types and |
| if (T1->isRecordType() && T2->isRecordType()) { |
| // - the initializer expression is an rvalue and "cv1 T1" is |
| // reference-compatible with "cv2 T2", or |
| if (InitLvalue != Expr::LV_Valid && |
| RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification) { |
| if (DerivedToBase) |
| Sequence.AddDerivedToBaseCastStep( |
| S.Context.getQualifiedType(T1, T2Quals), |
| /*isLValue=*/false); |
| if (T1Quals != T2Quals) |
| Sequence.AddQualificationConversionStep(cv1T1, /*IsLValue=*/false); |
| Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true); |
| return; |
| } |
| |
| // - T1 is not reference-related to T2 and the initializer expression |
| // can be implicitly converted to an rvalue of type "cv3 T3" (this |
| // conversion is selected by enumerating the applicable conversion |
| // functions (13.3.1.6) and choosing the best one through overload |
| // resolution (13.3)), |
| if (RefRelationship == Sema::Ref_Incompatible) { |
| ConvOvlResult = TryRefInitWithConversionFunction(S, Entity, |
| Kind, Initializer, |
| /*AllowRValues=*/true, |
| Sequence); |
| if (ConvOvlResult) |
| Sequence.SetOverloadFailure( |
| InitializationSequence::FK_ReferenceInitOverloadFailed, |
| ConvOvlResult); |
| |
| return; |
| } |
| |
| Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers); |
| return; |
| } |
| |
| // - If the initializer expression is an rvalue, with T2 an array type, |
| // and "cv1 T1" is reference-compatible with "cv2 T2," the reference |
| // is bound to the object represented by the rvalue (see 3.10). |
| // FIXME: How can an array type be reference-compatible with anything? |
| // Don't we mean the element types of T1 and T2? |
| |
| // - Otherwise, a temporary of type “cv1 T1” is created and initialized |
| // from the initializer expression using the rules for a non-reference |
| // copy initialization (8.5). The reference is then bound to the |
| // temporary. [...] |
| // Determine whether we are allowed to call explicit constructors or |
| // explicit conversion operators. |
| bool AllowExplicit = (Kind.getKind() == InitializationKind::IK_Direct); |
| ImplicitConversionSequence ICS |
| = S.TryImplicitConversion(Initializer, cv1T1, |
| /*SuppressUserConversions=*/false, AllowExplicit, |
| /*ForceRValue=*/false, |
| /*FIXME:InOverloadResolution=*/false, |
| /*UserCast=*/Kind.isExplicitCast()); |
| |
| if (ICS.isBad()) { |
| // FIXME: Use the conversion function set stored in ICS to turn |
| // this into an overloading ambiguity diagnostic. However, we need |
| // to keep that set as an OverloadCandidateSet rather than as some |
| // other kind of set. |
| if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty()) |
| Sequence.SetOverloadFailure( |
| InitializationSequence::FK_ReferenceInitOverloadFailed, |
| ConvOvlResult); |
| else |
| Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed); |
| return; |
| } |
| |
| // [...] If T1 is reference-related to T2, cv1 must be the |
| // same cv-qualification as, or greater cv-qualification |
| // than, cv2; otherwise, the program is ill-formed. |
| unsigned T1CVRQuals = T1Quals.getCVRQualifiers(); |
| unsigned T2CVRQuals = T2Quals.getCVRQualifiers(); |
| if (RefRelationship == Sema::Ref_Related && |
| (T1CVRQuals | T2CVRQuals) != T1CVRQuals) { |
| Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers); |
| return; |
| } |
| |
| // Perform the actual conversion. |
| Sequence.AddConversionSequenceStep(ICS, cv1T1); |
| Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true); |
| return; |
| } |
| |
| /// \brief Attempt character array initialization from a string literal |
| /// (C++ [dcl.init.string], C99 6.7.8). |
| static void TryStringLiteralInitialization(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr *Initializer, |
| InitializationSequence &Sequence) { |
| Sequence.setSequenceKind(InitializationSequence::StringInit); |
| Sequence.AddStringInitStep(Entity.getType()); |
| } |
| |
| /// \brief Attempt initialization by constructor (C++ [dcl.init]), which |
| /// enumerates the constructors of the initialized entity and performs overload |
| /// resolution to select the best. |
| static void TryConstructorInitialization(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr **Args, unsigned NumArgs, |
| QualType DestType, |
| InitializationSequence &Sequence) { |
| if (Kind.getKind() == InitializationKind::IK_Copy) |
| Sequence.setSequenceKind(InitializationSequence::UserDefinedConversion); |
| else |
| Sequence.setSequenceKind(InitializationSequence::ConstructorInitialization); |
| |
| // Build the candidate set directly in the initialization sequence |
| // structure, so that it will persist if we fail. |
| OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet(); |
| CandidateSet.clear(); |
| |
| // Determine whether we are allowed to call explicit constructors or |
| // explicit conversion operators. |
| bool AllowExplicit = (Kind.getKind() == InitializationKind::IK_Direct || |
| Kind.getKind() == InitializationKind::IK_Value || |
| Kind.getKind() == InitializationKind::IK_Default); |
| |
| // The type we're converting to is a class type. Enumerate its constructors |
| // to see if one is suitable. |
| const RecordType *DestRecordType = DestType->getAs<RecordType>(); |
| assert(DestRecordType && "Constructor initialization requires record type"); |
| CXXRecordDecl *DestRecordDecl |
| = cast<CXXRecordDecl>(DestRecordType->getDecl()); |
| |
| DeclarationName ConstructorName |
| = S.Context.DeclarationNames.getCXXConstructorName( |
| S.Context.getCanonicalType(DestType).getUnqualifiedType()); |
| DeclContext::lookup_iterator Con, ConEnd; |
| for (llvm::tie(Con, ConEnd) = DestRecordDecl->lookup(ConstructorName); |
| Con != ConEnd; ++Con) { |
| // Find the constructor (which may be a template). |
| CXXConstructorDecl *Constructor = 0; |
| FunctionTemplateDecl *ConstructorTmpl |
| = dyn_cast<FunctionTemplateDecl>(*Con); |
| if (ConstructorTmpl) |
| Constructor = cast<CXXConstructorDecl>( |
| ConstructorTmpl->getTemplatedDecl()); |
| else |
| Constructor = cast<CXXConstructorDecl>(*Con); |
| |
| if (!Constructor->isInvalidDecl() && |
| (AllowExplicit || !Constructor->isExplicit())) { |
| if (ConstructorTmpl) |
| S.AddTemplateOverloadCandidate(ConstructorTmpl, |
| ConstructorTmpl->getAccess(), |
| /*ExplicitArgs*/ 0, |
| Args, NumArgs, CandidateSet); |
| else |
| S.AddOverloadCandidate(Constructor, Constructor->getAccess(), |
| Args, NumArgs, CandidateSet); |
| } |
| } |
| |
| SourceLocation DeclLoc = Kind.getLocation(); |
| |
| // Perform overload resolution. If it fails, return the failed result. |
| OverloadCandidateSet::iterator Best; |
| if (OverloadingResult Result |
| = S.BestViableFunction(CandidateSet, DeclLoc, Best)) { |
| Sequence.SetOverloadFailure( |
| InitializationSequence::FK_ConstructorOverloadFailed, |
| Result); |
| return; |
| } |
| |
| // C++0x [dcl.init]p6: |
| // If a program calls for the default initialization of an object |
| // of a const-qualified type T, T shall be a class type with a |
| // user-provided default constructor. |
| if (Kind.getKind() == InitializationKind::IK_Default && |
| Entity.getType().isConstQualified() && |
| cast<CXXConstructorDecl>(Best->Function)->isImplicit()) { |
| Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst); |
| return; |
| } |
| |
| // Add the constructor initialization step. Any cv-qualification conversion is |
| // subsumed by the initialization. |
| if (Kind.getKind() == InitializationKind::IK_Copy) { |
| Sequence.AddUserConversionStep(Best->Function, Best->getAccess(), DestType); |
| } else { |
| Sequence.AddConstructorInitializationStep( |
| cast<CXXConstructorDecl>(Best->Function), |
| Best->getAccess(), |
| DestType); |
| } |
| } |
| |
| /// \brief Attempt value initialization (C++ [dcl.init]p7). |
| static void TryValueInitialization(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| InitializationSequence &Sequence) { |
| // C++ [dcl.init]p5: |
| // |
| // To value-initialize an object of type T means: |
| QualType T = Entity.getType(); |
| |
| // -- if T is an array type, then each element is value-initialized; |
| while (const ArrayType *AT = S.Context.getAsArrayType(T)) |
| T = AT->getElementType(); |
| |
| if (const RecordType *RT = T->getAs<RecordType>()) { |
| if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) { |
| // -- if T is a class type (clause 9) with a user-declared |
| // constructor (12.1), then the default constructor for T is |
| // called (and the initialization is ill-formed if T has no |
| // accessible default constructor); |
| // |
| // FIXME: we really want to refer to a single subobject of the array, |
| // but Entity doesn't have a way to capture that (yet). |
| if (ClassDecl->hasUserDeclaredConstructor()) |
| return TryConstructorInitialization(S, Entity, Kind, 0, 0, T, Sequence); |
| |
| // -- if T is a (possibly cv-qualified) non-union class type |
| // without a user-provided constructor, then the object is |
| // zero-initialized and, if T’s implicitly-declared default |
| // constructor is non-trivial, that constructor is called. |
| if ((ClassDecl->getTagKind() == TagDecl::TK_class || |
| ClassDecl->getTagKind() == TagDecl::TK_struct) && |
| !ClassDecl->hasTrivialConstructor()) { |
| Sequence.AddZeroInitializationStep(Entity.getType()); |
| return TryConstructorInitialization(S, Entity, Kind, 0, 0, T, Sequence); |
| } |
| } |
| } |
| |
| Sequence.AddZeroInitializationStep(Entity.getType()); |
| Sequence.setSequenceKind(InitializationSequence::ZeroInitialization); |
| } |
| |
| /// \brief Attempt default initialization (C++ [dcl.init]p6). |
| static void TryDefaultInitialization(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| InitializationSequence &Sequence) { |
| assert(Kind.getKind() == InitializationKind::IK_Default); |
| |
| // C++ [dcl.init]p6: |
| // To default-initialize an object of type T means: |
| // - if T is an array type, each element is default-initialized; |
| QualType DestType = Entity.getType(); |
| while (const ArrayType *Array = S.Context.getAsArrayType(DestType)) |
| DestType = Array->getElementType(); |
| |
| // - if T is a (possibly cv-qualified) class type (Clause 9), the default |
| // constructor for T is called (and the initialization is ill-formed if |
| // T has no accessible default constructor); |
| if (DestType->isRecordType()) { |
| return TryConstructorInitialization(S, Entity, Kind, 0, 0, DestType, |
| Sequence); |
| } |
| |
| // - otherwise, no initialization is performed. |
| Sequence.setSequenceKind(InitializationSequence::NoInitialization); |
| |
| // If a program calls for the default initialization of an object of |
| // a const-qualified type T, T shall be a class type with a user-provided |
| // default constructor. |
| if (DestType.isConstQualified()) |
| Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst); |
| } |
| |
| /// \brief Attempt a user-defined conversion between two types (C++ [dcl.init]), |
| /// which enumerates all conversion functions and performs overload resolution |
| /// to select the best. |
| static void TryUserDefinedConversion(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr *Initializer, |
| InitializationSequence &Sequence) { |
| Sequence.setSequenceKind(InitializationSequence::UserDefinedConversion); |
| |
| QualType DestType = Entity.getType(); |
| assert(!DestType->isReferenceType() && "References are handled elsewhere"); |
| QualType SourceType = Initializer->getType(); |
| assert((DestType->isRecordType() || SourceType->isRecordType()) && |
| "Must have a class type to perform a user-defined conversion"); |
| |
| // Build the candidate set directly in the initialization sequence |
| // structure, so that it will persist if we fail. |
| OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet(); |
| CandidateSet.clear(); |
| |
| // Determine whether we are allowed to call explicit constructors or |
| // explicit conversion operators. |
| bool AllowExplicit = Kind.getKind() == InitializationKind::IK_Direct; |
| |
| if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) { |
| // The type we're converting to is a class type. Enumerate its constructors |
| // to see if there is a suitable conversion. |
| CXXRecordDecl *DestRecordDecl |
| = cast<CXXRecordDecl>(DestRecordType->getDecl()); |
| |
| DeclarationName ConstructorName |
| = S.Context.DeclarationNames.getCXXConstructorName( |
| S.Context.getCanonicalType(DestType).getUnqualifiedType()); |
| DeclContext::lookup_iterator Con, ConEnd; |
| for (llvm::tie(Con, ConEnd) = DestRecordDecl->lookup(ConstructorName); |
| Con != ConEnd; ++Con) { |
| // Find the constructor (which may be a template). |
| CXXConstructorDecl *Constructor = 0; |
| FunctionTemplateDecl *ConstructorTmpl |
| = dyn_cast<FunctionTemplateDecl>(*Con); |
| if (ConstructorTmpl) |
| Constructor = cast<CXXConstructorDecl>( |
| ConstructorTmpl->getTemplatedDecl()); |
| else |
| Constructor = cast<CXXConstructorDecl>(*Con); |
| |
| if (!Constructor->isInvalidDecl() && |
| Constructor->isConvertingConstructor(AllowExplicit)) { |
| if (ConstructorTmpl) |
| S.AddTemplateOverloadCandidate(ConstructorTmpl, |
| ConstructorTmpl->getAccess(), |
| /*ExplicitArgs*/ 0, |
| &Initializer, 1, CandidateSet); |
| else |
| S.AddOverloadCandidate(Constructor, Constructor->getAccess(), |
| &Initializer, 1, CandidateSet); |
| } |
| } |
| } |
| |
| SourceLocation DeclLoc = Initializer->getLocStart(); |
| |
| if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) { |
| // The type we're converting from is a class type, enumerate its conversion |
| // functions. |
| |
| // We can only enumerate the conversion functions for a complete type; if |
| // the type isn't complete, simply skip this step. |
| if (!S.RequireCompleteType(DeclLoc, SourceType, 0)) { |
| CXXRecordDecl *SourceRecordDecl |
| = cast<CXXRecordDecl>(SourceRecordType->getDecl()); |
| |
| const UnresolvedSetImpl *Conversions |
| = SourceRecordDecl->getVisibleConversionFunctions(); |
| for (UnresolvedSetImpl::const_iterator I = Conversions->begin(), |
| E = Conversions->end(); |
| I != E; ++I) { |
| NamedDecl *D = *I; |
| CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); |
| if (isa<UsingShadowDecl>(D)) |
| D = cast<UsingShadowDecl>(D)->getTargetDecl(); |
| |
| FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D); |
| CXXConversionDecl *Conv; |
| if (ConvTemplate) |
| Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); |
| else |
| Conv = cast<CXXConversionDecl>(*I); |
| |
| if (AllowExplicit || !Conv->isExplicit()) { |
| if (ConvTemplate) |
| S.AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), |
| ActingDC, Initializer, DestType, |
| CandidateSet); |
| else |
| S.AddConversionCandidate(Conv, I.getAccess(), ActingDC, |
| Initializer, DestType, CandidateSet); |
| } |
| } |
| } |
| } |
| |
| // Perform overload resolution. If it fails, return the failed result. |
| OverloadCandidateSet::iterator Best; |
| if (OverloadingResult Result |
| = S.BestViableFunction(CandidateSet, DeclLoc, Best)) { |
| Sequence.SetOverloadFailure( |
| InitializationSequence::FK_UserConversionOverloadFailed, |
| Result); |
| return; |
| } |
| |
| FunctionDecl *Function = Best->Function; |
| |
| if (isa<CXXConstructorDecl>(Function)) { |
| // Add the user-defined conversion step. Any cv-qualification conversion is |
| // subsumed by the initialization. |
| Sequence.AddUserConversionStep(Function, Best->getAccess(), DestType); |
| return; |
| } |
| |
| // Add the user-defined conversion step that calls the conversion function. |
| QualType ConvType = Function->getResultType().getNonReferenceType(); |
| Sequence.AddUserConversionStep(Function, Best->getAccess(), ConvType); |
| |
| // If the conversion following the call to the conversion function is |
| // interesting, add it as a separate step. |
| if (Best->FinalConversion.First || Best->FinalConversion.Second || |
| Best->FinalConversion.Third) { |
| ImplicitConversionSequence ICS; |
| ICS.setStandard(); |
| ICS.Standard = Best->FinalConversion; |
| Sequence.AddConversionSequenceStep(ICS, DestType); |
| } |
| } |
| |
| /// \brief Attempt an implicit conversion (C++ [conv]) converting from one |
| /// non-class type to another. |
| static void TryImplicitConversion(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr *Initializer, |
| InitializationSequence &Sequence) { |
| ImplicitConversionSequence ICS |
| = S.TryImplicitConversion(Initializer, Entity.getType(), |
| /*SuppressUserConversions=*/true, |
| /*AllowExplicit=*/false, |
| /*ForceRValue=*/false, |
| /*FIXME:InOverloadResolution=*/false, |
| /*UserCast=*/Kind.isExplicitCast()); |
| |
| if (ICS.isBad()) { |
| Sequence.SetFailed(InitializationSequence::FK_ConversionFailed); |
| return; |
| } |
| |
| Sequence.AddConversionSequenceStep(ICS, Entity.getType()); |
| } |
| |
| InitializationSequence::InitializationSequence(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr **Args, |
| unsigned NumArgs) { |
| ASTContext &Context = S.Context; |
| |
| // C++0x [dcl.init]p16: |
| // The semantics of initializers are as follows. The destination type is |
| // the type of the object or reference being initialized and the source |
| // type is the type of the initializer expression. The source type is not |
| // defined when the initializer is a braced-init-list or when it is a |
| // parenthesized list of expressions. |
| QualType DestType = Entity.getType(); |
| |
| if (DestType->isDependentType() || |
| Expr::hasAnyTypeDependentArguments(Args, NumArgs)) { |
| SequenceKind = DependentSequence; |
| return; |
| } |
| |
| QualType SourceType; |
| Expr *Initializer = 0; |
| if (NumArgs == 1) { |
| Initializer = Args[0]; |
| if (!isa<InitListExpr>(Initializer)) |
| SourceType = Initializer->getType(); |
| } |
| |
| // - If the initializer is a braced-init-list, the object is |
| // list-initialized (8.5.4). |
| if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) { |
| TryListInitialization(S, Entity, Kind, InitList, *this); |
| return; |
| } |
| |
| // - If the destination type is a reference type, see 8.5.3. |
| if (DestType->isReferenceType()) { |
| // C++0x [dcl.init.ref]p1: |
| // A variable declared to be a T& or T&&, that is, "reference to type T" |
| // (8.3.2), shall be initialized by an object, or function, of type T or |
| // by an object that can be converted into a T. |
| // (Therefore, multiple arguments are not permitted.) |
| if (NumArgs != 1) |
| SetFailed(FK_TooManyInitsForReference); |
| else |
| TryReferenceInitialization(S, Entity, Kind, Args[0], *this); |
| return; |
| } |
| |
| // - If the destination type is an array of characters, an array of |
| // char16_t, an array of char32_t, or an array of wchar_t, and the |
| // initializer is a string literal, see 8.5.2. |
| if (Initializer && IsStringInit(Initializer, DestType, Context)) { |
| TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this); |
| return; |
| } |
| |
| // - If the initializer is (), the object is value-initialized. |
| if (Kind.getKind() == InitializationKind::IK_Value || |
| (Kind.getKind() == InitializationKind::IK_Direct && NumArgs == 0)) { |
| TryValueInitialization(S, Entity, Kind, *this); |
| return; |
| } |
| |
| // Handle default initialization. |
| if (Kind.getKind() == InitializationKind::IK_Default){ |
| TryDefaultInitialization(S, Entity, Kind, *this); |
| return; |
| } |
| |
| // - Otherwise, if the destination type is an array, the program is |
| // ill-formed. |
| if (const ArrayType *AT = Context.getAsArrayType(DestType)) { |
| if (AT->getElementType()->isAnyCharacterType()) |
| SetFailed(FK_ArrayNeedsInitListOrStringLiteral); |
| else |
| SetFailed(FK_ArrayNeedsInitList); |
| |
| return; |
| } |
| |
| // Handle initialization in C |
| if (!S.getLangOptions().CPlusPlus) { |
| setSequenceKind(CAssignment); |
| AddCAssignmentStep(DestType); |
| return; |
| } |
| |
| // - If the destination type is a (possibly cv-qualified) class type: |
| if (DestType->isRecordType()) { |
| // - If the initialization is direct-initialization, or if it is |
| // copy-initialization where the cv-unqualified version of the |
| // source type is the same class as, or a derived class of, the |
| // class of the destination, constructors are considered. [...] |
| if (Kind.getKind() == InitializationKind::IK_Direct || |
| (Kind.getKind() == InitializationKind::IK_Copy && |
| (Context.hasSameUnqualifiedType(SourceType, DestType) || |
| S.IsDerivedFrom(SourceType, DestType)))) |
| TryConstructorInitialization(S, Entity, Kind, Args, NumArgs, |
| Entity.getType(), *this); |
| // - Otherwise (i.e., for the remaining copy-initialization cases), |
| // user-defined conversion sequences that can convert from the source |
| // type to the destination type or (when a conversion function is |
| // used) to a derived class thereof are enumerated as described in |
| // 13.3.1.4, and the best one is chosen through overload resolution |
| // (13.3). |
| else |
| TryUserDefinedConversion(S, Entity, Kind, Initializer, *this); |
| return; |
| } |
| |
| if (NumArgs > 1) { |
| SetFailed(FK_TooManyInitsForScalar); |
| return; |
| } |
| assert(NumArgs == 1 && "Zero-argument case handled above"); |
| |
| // - Otherwise, if the source type is a (possibly cv-qualified) class |
| // type, conversion functions are considered. |
| if (!SourceType.isNull() && SourceType->isRecordType()) { |
| TryUserDefinedConversion(S, Entity, Kind, Initializer, *this); |
| return; |
| } |
| |
| // - Otherwise, the initial value of the object being initialized is the |
| // (possibly converted) value of the initializer expression. Standard |
| // conversions (Clause 4) will be used, if necessary, to convert the |
| // initializer expression to the cv-unqualified version of the |
| // destination type; no user-defined conversions are considered. |
| setSequenceKind(StandardConversion); |
| TryImplicitConversion(S, Entity, Kind, Initializer, *this); |
| } |
| |
| InitializationSequence::~InitializationSequence() { |
| for (llvm::SmallVectorImpl<Step>::iterator Step = Steps.begin(), |
| StepEnd = Steps.end(); |
| Step != StepEnd; ++Step) |
| Step->Destroy(); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Perform initialization |
| //===----------------------------------------------------------------------===// |
| static Sema::AssignmentAction |
| getAssignmentAction(const InitializedEntity &Entity) { |
| switch(Entity.getKind()) { |
| case InitializedEntity::EK_Variable: |
| case InitializedEntity::EK_New: |
| return Sema::AA_Initializing; |
| |
| case InitializedEntity::EK_Parameter: |
| // FIXME: Can we tell when we're sending vs. passing? |
| return Sema::AA_Passing; |
| |
| case InitializedEntity::EK_Result: |
| return Sema::AA_Returning; |
| |
| case InitializedEntity::EK_Exception: |
| case InitializedEntity::EK_Base: |
| llvm_unreachable("No assignment action for C++-specific initialization"); |
| break; |
| |
| case InitializedEntity::EK_Temporary: |
| // FIXME: Can we tell apart casting vs. converting? |
| return Sema::AA_Casting; |
| |
| case InitializedEntity::EK_Member: |
| case InitializedEntity::EK_ArrayElement: |
| case InitializedEntity::EK_VectorElement: |
| return Sema::AA_Initializing; |
| } |
| |
| return Sema::AA_Converting; |
| } |
| |
| static bool shouldBindAsTemporary(const InitializedEntity &Entity, |
| bool IsCopy) { |
| switch (Entity.getKind()) { |
| case InitializedEntity::EK_Result: |
| case InitializedEntity::EK_Exception: |
| case InitializedEntity::EK_ArrayElement: |
| case InitializedEntity::EK_Member: |
| return !IsCopy; |
| |
| case InitializedEntity::EK_New: |
| case InitializedEntity::EK_Variable: |
| case InitializedEntity::EK_Base: |
| case InitializedEntity::EK_VectorElement: |
| return false; |
| |
| case InitializedEntity::EK_Parameter: |
| case InitializedEntity::EK_Temporary: |
| return true; |
| } |
| |
| llvm_unreachable("missed an InitializedEntity kind?"); |
| } |
| |
| /// \brief If we need to perform an additional copy of the initialized object |
| /// for this kind of entity (e.g., the result of a function or an object being |
| /// thrown), make the copy. |
| static Sema::OwningExprResult CopyIfRequiredForEntity(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Sema::OwningExprResult CurInit) { |
| Expr *CurInitExpr = (Expr *)CurInit.get(); |
| |
| SourceLocation Loc; |
| |
| switch (Entity.getKind()) { |
| case InitializedEntity::EK_Result: |
| if (Entity.getType()->isReferenceType()) |
| return move(CurInit); |
| Loc = Entity.getReturnLoc(); |
| break; |
| |
| case InitializedEntity::EK_Exception: |
| Loc = Entity.getThrowLoc(); |
| break; |
| |
| case InitializedEntity::EK_Variable: |
| if (Entity.getType()->isReferenceType() || |
| Kind.getKind() != InitializationKind::IK_Copy) |
| return move(CurInit); |
| Loc = Entity.getDecl()->getLocation(); |
| break; |
| |
| case InitializedEntity::EK_ArrayElement: |
| case InitializedEntity::EK_Member: |
| if (Entity.getType()->isReferenceType() || |
| Kind.getKind() != InitializationKind::IK_Copy) |
| return move(CurInit); |
| Loc = CurInitExpr->getLocStart(); |
| break; |
| |
| case InitializedEntity::EK_Parameter: |
| // FIXME: Do we need this initialization for a parameter? |
| return move(CurInit); |
| |
| case InitializedEntity::EK_New: |
| case InitializedEntity::EK_Temporary: |
| case InitializedEntity::EK_Base: |
| case InitializedEntity::EK_VectorElement: |
| // We don't need to copy for any of these initialized entities. |
| return move(CurInit); |
| } |
| |
| CXXRecordDecl *Class = 0; |
| if (const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>()) |
| Class = cast<CXXRecordDecl>(Record->getDecl()); |
| if (!Class) |
| return move(CurInit); |
| |
| // Perform overload resolution using the class's copy constructors. |
| DeclarationName ConstructorName |
| = S.Context.DeclarationNames.getCXXConstructorName( |
| S.Context.getCanonicalType(S.Context.getTypeDeclType(Class))); |
| DeclContext::lookup_iterator Con, ConEnd; |
| OverloadCandidateSet CandidateSet; |
| for (llvm::tie(Con, ConEnd) = Class->lookup(ConstructorName); |
| Con != ConEnd; ++Con) { |
| // Find the constructor (which may be a template). |
| CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(*Con); |
| if (!Constructor || Constructor->isInvalidDecl() || |
| !Constructor->isCopyConstructor()) |
| continue; |
| |
| S.AddOverloadCandidate(Constructor, Constructor->getAccess(), |
| &CurInitExpr, 1, CandidateSet); |
| } |
| |
| OverloadCandidateSet::iterator Best; |
| switch (S.BestViableFunction(CandidateSet, Loc, Best)) { |
| case OR_Success: |
| break; |
| |
| case OR_No_Viable_Function: |
| S.Diag(Loc, diag::err_temp_copy_no_viable) |
| << (int)Entity.getKind() << CurInitExpr->getType() |
| << CurInitExpr->getSourceRange(); |
| S.PrintOverloadCandidates(CandidateSet, Sema::OCD_AllCandidates, |
| &CurInitExpr, 1); |
| return S.ExprError(); |
| |
| case OR_Ambiguous: |
| S.Diag(Loc, diag::err_temp_copy_ambiguous) |
| << (int)Entity.getKind() << CurInitExpr->getType() |
| << CurInitExpr->getSourceRange(); |
| S.PrintOverloadCandidates(CandidateSet, Sema::OCD_ViableCandidates, |
| &CurInitExpr, 1); |
| return S.ExprError(); |
| |
| case OR_Deleted: |
| S.Diag(Loc, diag::err_temp_copy_deleted) |
| << (int)Entity.getKind() << CurInitExpr->getType() |
| << CurInitExpr->getSourceRange(); |
| S.Diag(Best->Function->getLocation(), diag::note_unavailable_here) |
| << Best->Function->isDeleted(); |
| return S.ExprError(); |
| } |
| |
| CurInit.release(); |
| return S.BuildCXXConstructExpr(Loc, CurInitExpr->getType(), |
| cast<CXXConstructorDecl>(Best->Function), |
| /*Elidable=*/true, |
| Sema::MultiExprArg(S, |
| (void**)&CurInitExpr, 1)); |
| } |
| |
| Action::OwningExprResult |
| InitializationSequence::Perform(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Action::MultiExprArg Args, |
| QualType *ResultType) { |
| if (SequenceKind == FailedSequence) { |
| unsigned NumArgs = Args.size(); |
| Diagnose(S, Entity, Kind, (Expr **)Args.release(), NumArgs); |
| return S.ExprError(); |
| } |
| |
| if (SequenceKind == DependentSequence) { |
| // If the declaration is a non-dependent, incomplete array type |
| // that has an initializer, then its type will be completed once |
| // the initializer is instantiated. |
| if (ResultType && !Entity.getType()->isDependentType() && |
| Args.size() == 1) { |
| QualType DeclType = Entity.getType(); |
| if (const IncompleteArrayType *ArrayT |
| = S.Context.getAsIncompleteArrayType(DeclType)) { |
| // FIXME: We don't currently have the ability to accurately |
| // compute the length of an initializer list without |
| // performing full type-checking of the initializer list |
| // (since we have to determine where braces are implicitly |
| // introduced and such). So, we fall back to making the array |
| // type a dependently-sized array type with no specified |
| // bound. |
| if (isa<InitListExpr>((Expr *)Args.get()[0])) { |
| SourceRange Brackets; |
| |
| // Scavange the location of the brackets from the entity, if we can. |
| if (DeclaratorDecl *DD = Entity.getDecl()) { |
| if (TypeSourceInfo *TInfo = DD->getTypeSourceInfo()) { |
| TypeLoc TL = TInfo->getTypeLoc(); |
| if (IncompleteArrayTypeLoc *ArrayLoc |
| = dyn_cast<IncompleteArrayTypeLoc>(&TL)) |
| Brackets = ArrayLoc->getBracketsRange(); |
| } |
| } |
| |
| *ResultType |
| = S.Context.getDependentSizedArrayType(ArrayT->getElementType(), |
| /*NumElts=*/0, |
| ArrayT->getSizeModifier(), |
| ArrayT->getIndexTypeCVRQualifiers(), |
| Brackets); |
| } |
| |
| } |
| } |
| |
| if (Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast()) |
| return Sema::OwningExprResult(S, Args.release()[0]); |
| |
| unsigned NumArgs = Args.size(); |
| return S.Owned(new (S.Context) ParenListExpr(S.Context, |
| SourceLocation(), |
| (Expr **)Args.release(), |
| NumArgs, |
| SourceLocation())); |
| } |
| |
| if (SequenceKind == NoInitialization) |
| return S.Owned((Expr *)0); |
| |
| QualType DestType = Entity.getType().getNonReferenceType(); |
| // FIXME: Ugly hack around the fact that Entity.getType() is not |
| // the same as Entity.getDecl()->getType() in cases involving type merging, |
| // and we want latter when it makes sense. |
| if (ResultType) |
| *ResultType = Entity.getDecl() ? Entity.getDecl()->getType() : |
| Entity.getType(); |
| |
| Sema::OwningExprResult CurInit = S.Owned((Expr *)0); |
| |
| assert(!Steps.empty() && "Cannot have an empty initialization sequence"); |
| |
| // For initialization steps that start with a single initializer, |
| // grab the only argument out the Args and place it into the "current" |
| // initializer. |
| switch (Steps.front().Kind) { |
| case SK_ResolveAddressOfOverloadedFunction: |
| case SK_CastDerivedToBaseRValue: |
| case SK_CastDerivedToBaseLValue: |
| case SK_BindReference: |
| case SK_BindReferenceToTemporary: |
| case SK_UserConversion: |
| case SK_QualificationConversionLValue: |
| case SK_QualificationConversionRValue: |
| case SK_ConversionSequence: |
| case SK_ListInitialization: |
| case SK_CAssignment: |
| case SK_StringInit: |
| assert(Args.size() == 1); |
| CurInit = Sema::OwningExprResult(S, ((Expr **)(Args.get()))[0]->Retain()); |
| if (CurInit.isInvalid()) |
| return S.ExprError(); |
| break; |
| |
| case SK_ConstructorInitialization: |
| case SK_ZeroInitialization: |
| break; |
| } |
| |
| // Walk through the computed steps for the initialization sequence, |
| // performing the specified conversions along the way. |
| bool ConstructorInitRequiresZeroInit = false; |
| for (step_iterator Step = step_begin(), StepEnd = step_end(); |
| Step != StepEnd; ++Step) { |
| if (CurInit.isInvalid()) |
| return S.ExprError(); |
| |
| Expr *CurInitExpr = (Expr *)CurInit.get(); |
| QualType SourceType = CurInitExpr? CurInitExpr->getType() : QualType(); |
| |
| switch (Step->Kind) { |
| case SK_ResolveAddressOfOverloadedFunction: |
| // Overload resolution determined which function invoke; update the |
| // initializer to reflect that choice. |
| // Access control was done in overload resolution. |
| CurInit = S.FixOverloadedFunctionReference(move(CurInit), |
| cast<FunctionDecl>(Step->Function.getDecl())); |
| break; |
| |
| case SK_CastDerivedToBaseRValue: |
| case SK_CastDerivedToBaseLValue: { |
| // We have a derived-to-base cast that produces either an rvalue or an |
| // lvalue. Perform that cast. |
| |
| // Casts to inaccessible base classes are allowed with C-style casts. |
| bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast(); |
| if (S.CheckDerivedToBaseConversion(SourceType, Step->Type, |
| CurInitExpr->getLocStart(), |
| CurInitExpr->getSourceRange(), |
| IgnoreBaseAccess)) |
| return S.ExprError(); |
| |
| CurInit = S.Owned(new (S.Context) ImplicitCastExpr(Step->Type, |
| CastExpr::CK_DerivedToBase, |
| (Expr*)CurInit.release(), |
| Step->Kind == SK_CastDerivedToBaseLValue)); |
| break; |
| } |
| |
| case SK_BindReference: |
| if (FieldDecl *BitField = CurInitExpr->getBitField()) { |
| // References cannot bind to bit fields (C++ [dcl.init.ref]p5). |
| S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield) |
| << Entity.getType().isVolatileQualified() |
| << BitField->getDeclName() |
| << CurInitExpr->getSourceRange(); |
| S.Diag(BitField->getLocation(), diag::note_bitfield_decl); |
| return S.ExprError(); |
| } |
| |
| if (CurInitExpr->refersToVectorElement()) { |
| // Vector elements cannot bind to bit fields. |
| S.Diag(Kind.getLocation(), diag::err_reference_bind_to_vector_element) |
| << Entity.getType().isVolatileQualified() |
| << CurInitExpr->getSourceRange(); |
| return S.ExprError(); |
| } |
| |
| // Reference binding does not have any corresponding ASTs. |
| |
| // Check exception specifications |
| if (S.CheckExceptionSpecCompatibility(CurInitExpr, DestType)) |
| return S.ExprError(); |
| |
| // FIXME: We should do this for all types. |
| if (DestType->isAnyComplexType()) { |
| CurInit = |
| S.Owned(CXXBindReferenceExpr::Create(S.Context, |
| CurInit.takeAs<Expr>(), |
| /*ExtendsLifetime=*/false, |
| /*RequiresTemporaryCopy=*/false)); |
| } |
| |
| break; |
| |
| case SK_BindReferenceToTemporary: |
| // Check exception specifications |
| if (S.CheckExceptionSpecCompatibility(CurInitExpr, DestType)) |
| return S.ExprError(); |
| |
| // FIXME: We should do this for all types. |
| if (DestType->isAnyComplexType()) { |
| CurInit = |
| S.Owned(CXXBindReferenceExpr::Create(S.Context, |
| CurInit.takeAs<Expr>(), |
| /*ExtendsLifetime=*/false, |
| /*RequiresTemporaryCopy=*/true)); |
| } |
| break; |
| |
| case SK_UserConversion: { |
| // We have a user-defined conversion that invokes either a constructor |
| // or a conversion function. |
| CastExpr::CastKind CastKind = CastExpr::CK_Unknown; |
| bool IsCopy = false; |
| FunctionDecl *Fn = cast<FunctionDecl>(Step->Function.getDecl()); |
| AccessSpecifier FnAccess = Step->Function.getAccess(); |
| if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Fn)) { |
| // Build a call to the selected constructor. |
| ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(S); |
| SourceLocation Loc = CurInitExpr->getLocStart(); |
| CurInit.release(); // Ownership transferred into MultiExprArg, below. |
| |
| // Determine the arguments required to actually perform the constructor |
| // call. |
| if (S.CompleteConstructorCall(Constructor, |
| Sema::MultiExprArg(S, |
| (void **)&CurInitExpr, |
| 1), |
| Loc, ConstructorArgs)) |
| return S.ExprError(); |
| |
| // Build the an expression that constructs a temporary. |
| CurInit = S.BuildCXXConstructExpr(Loc, Step->Type, Constructor, |
| move_arg(ConstructorArgs)); |
| if (CurInit.isInvalid()) |
| return S.ExprError(); |
| |
| S.CheckConstructorAccess(Kind.getLocation(), Constructor, FnAccess); |
| |
| CastKind = CastExpr::CK_ConstructorConversion; |
| QualType Class = S.Context.getTypeDeclType(Constructor->getParent()); |
| if (S.Context.hasSameUnqualifiedType(SourceType, Class) || |
| S.IsDerivedFrom(SourceType, Class)) |
| IsCopy = true; |
| } else { |
| // Build a call to the conversion function. |
| CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Fn); |
| |
| S.CheckMemberOperatorAccess(Kind.getLocation(), CurInitExpr, |
| Conversion, FnAccess); |
| |
| // FIXME: Should we move this initialization into a separate |
| // derived-to-base conversion? I believe the answer is "no", because |
| // we don't want to turn off access control here for c-style casts. |
| if (S.PerformObjectArgumentInitialization(CurInitExpr, Conversion)) |
| return S.ExprError(); |
| |
| // Do a little dance to make sure that CurInit has the proper |
| // pointer. |
| CurInit.release(); |
| |
| // Build the actual call to the conversion function. |
| CurInit = S.Owned(S.BuildCXXMemberCallExpr(CurInitExpr, Conversion)); |
| if (CurInit.isInvalid() || !CurInit.get()) |
| return S.ExprError(); |
| |
| CastKind = CastExpr::CK_UserDefinedConversion; |
| } |
| |
| if (shouldBindAsTemporary(Entity, IsCopy)) |
| CurInit = S.MaybeBindToTemporary(CurInit.takeAs<Expr>()); |
| |
| CurInitExpr = CurInit.takeAs<Expr>(); |
| CurInit = S.Owned(new (S.Context) ImplicitCastExpr(CurInitExpr->getType(), |
| CastKind, |
| CurInitExpr, |
| false)); |
| |
| if (!IsCopy) |
| CurInit = CopyIfRequiredForEntity(S, Entity, Kind, move(CurInit)); |
| break; |
| } |
| |
| case SK_QualificationConversionLValue: |
| case SK_QualificationConversionRValue: |
| // Perform a qualification conversion; these can never go wrong. |
| S.ImpCastExprToType(CurInitExpr, Step->Type, |
| CastExpr::CK_NoOp, |
| Step->Kind == SK_QualificationConversionLValue); |
| CurInit.release(); |
| CurInit = S.Owned(CurInitExpr); |
| break; |
| |
| case SK_ConversionSequence: |
| if (S.PerformImplicitConversion(CurInitExpr, Step->Type, Sema::AA_Converting, |
| false, false, *Step->ICS)) |
| return S.ExprError(); |
| |
| CurInit.release(); |
| CurInit = S.Owned(CurInitExpr); |
| break; |
| |
| case SK_ListInitialization: { |
| InitListExpr *InitList = cast<InitListExpr>(CurInitExpr); |
| QualType Ty = Step->Type; |
| if (S.CheckInitList(Entity, InitList, ResultType? *ResultType : Ty)) |
| return S.ExprError(); |
| |
| CurInit.release(); |
| CurInit = S.Owned(InitList); |
| break; |
| } |
| |
| case SK_ConstructorInitialization: { |
| CXXConstructorDecl *Constructor |
| = cast<CXXConstructorDecl>(Step->Function.getDecl()); |
| |
| // Build a call to the selected constructor. |
| ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(S); |
| SourceLocation Loc = Kind.getLocation(); |
| |
| // Determine the arguments required to actually perform the constructor |
| // call. |
| if (S.CompleteConstructorCall(Constructor, move(Args), |
| Loc, ConstructorArgs)) |
| return S.ExprError(); |
| |
| // Build the an expression that constructs a temporary. |
| CurInit = S.BuildCXXConstructExpr(Loc, Entity.getType(), |
| Constructor, |
| move_arg(ConstructorArgs), |
| ConstructorInitRequiresZeroInit, |
| Entity.getKind() == InitializedEntity::EK_Base); |
| if (CurInit.isInvalid()) |
| return S.ExprError(); |
| |
| // Only check access if all of that succeeded. |
| S.CheckConstructorAccess(Loc, Constructor, Step->Function.getAccess()); |
| |
| bool Elidable |
| = cast<CXXConstructExpr>((Expr *)CurInit.get())->isElidable(); |
| if (shouldBindAsTemporary(Entity, Elidable)) |
| CurInit = S.MaybeBindToTemporary(CurInit.takeAs<Expr>()); |
| |
| if (!Elidable) |
| CurInit = CopyIfRequiredForEntity(S, Entity, Kind, move(CurInit)); |
| break; |
| } |
| |
| case SK_ZeroInitialization: { |
| step_iterator NextStep = Step; |
| ++NextStep; |
| if (NextStep != StepEnd && |
| NextStep->Kind == SK_ConstructorInitialization) { |
| // The need for zero-initialization is recorded directly into |
| // the call to the object's constructor within the next step. |
| ConstructorInitRequiresZeroInit = true; |
| } else if (Kind.getKind() == InitializationKind::IK_Value && |
| S.getLangOptions().CPlusPlus && |
| !Kind.isImplicitValueInit()) { |
| CurInit = S.Owned(new (S.Context) CXXZeroInitValueExpr(Step->Type, |
| Kind.getRange().getBegin(), |
| Kind.getRange().getEnd())); |
| } else { |
| CurInit = S.Owned(new (S.Context) ImplicitValueInitExpr(Step->Type)); |
| } |
| break; |
| } |
| |
| case SK_CAssignment: { |
| QualType SourceType = CurInitExpr->getType(); |
| Sema::AssignConvertType ConvTy = |
| S.CheckSingleAssignmentConstraints(Step->Type, CurInitExpr); |
| |
| // If this is a call, allow conversion to a transparent union. |
| if (ConvTy != Sema::Compatible && |
| Entity.getKind() == InitializedEntity::EK_Parameter && |
| S.CheckTransparentUnionArgumentConstraints(Step->Type, CurInitExpr) |
| == Sema::Compatible) |
| ConvTy = Sema::Compatible; |
| |
| if (S.DiagnoseAssignmentResult(ConvTy, Kind.getLocation(), |
| Step->Type, SourceType, |
| CurInitExpr, getAssignmentAction(Entity))) |
| return S.ExprError(); |
| |
| CurInit.release(); |
| CurInit = S.Owned(CurInitExpr); |
| break; |
| } |
| |
| case SK_StringInit: { |
| QualType Ty = Step->Type; |
| CheckStringInit(CurInitExpr, ResultType ? *ResultType : Ty, S); |
| break; |
| } |
| } |
| } |
| |
| return move(CurInit); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Diagnose initialization failures |
| //===----------------------------------------------------------------------===// |
| bool InitializationSequence::Diagnose(Sema &S, |
| const InitializedEntity &Entity, |
| const InitializationKind &Kind, |
| Expr **Args, unsigned NumArgs) { |
| if (SequenceKind != FailedSequence) |
| return false; |
| |
| QualType DestType = Entity.getType(); |
| switch (Failure) { |
| case FK_TooManyInitsForReference: |
| // FIXME: Customize for the initialized entity? |
| if (NumArgs == 0) |
| S.Diag(Kind.getLocation(), diag::err_reference_without_init) |
| << DestType.getNonReferenceType(); |
| else // FIXME: diagnostic below could be better! |
| S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits) |
| << SourceRange(Args[0]->getLocStart(), Args[NumArgs - 1]->getLocEnd()); |
| break; |
| |
| case FK_ArrayNeedsInitList: |
| case FK_ArrayNeedsInitListOrStringLiteral: |
| S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) |
| << (Failure == FK_ArrayNeedsInitListOrStringLiteral); |
| break; |
| |
| case FK_AddressOfOverloadFailed: |
| S.ResolveAddressOfOverloadedFunction(Args[0], |
| DestType.getNonReferenceType(), |
| true); |
| break; |
| |
| case FK_ReferenceInitOverloadFailed: |
| case FK_UserConversionOverloadFailed: |
| switch (FailedOverloadResult) { |
| case OR_Ambiguous: |
| if (Failure == FK_UserConversionOverloadFailed) |
| S.Diag(Kind.getLocation(), diag::err_typecheck_ambiguous_condition) |
| << Args[0]->getType() << DestType |
| << Args[0]->getSourceRange(); |
| else |
| S.Diag(Kind.getLocation(), diag::err_ref_init_ambiguous) |
| << DestType << Args[0]->getType() |
| << Args[0]->getSourceRange(); |
| |
| S.PrintOverloadCandidates(FailedCandidateSet, Sema::OCD_ViableCandidates, |
| Args, NumArgs); |
| break; |
| |
| case OR_No_Viable_Function: |
| S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition) |
| << Args[0]->getType() << DestType.getNonReferenceType() |
| << Args[0]->getSourceRange(); |
| S.PrintOverloadCandidates(FailedCandidateSet, Sema::OCD_AllCandidates, |
| Args, NumArgs); |
| break; |
| |
| case OR_Deleted: { |
| S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function) |
| << Args[0]->getType() << DestType.getNonReferenceType() |
| << Args[0]->getSourceRange(); |
| OverloadCandidateSet::iterator Best; |
| OverloadingResult Ovl = S.BestViableFunction(FailedCandidateSet, |
| Kind.getLocation(), |
| Best); |
| if (Ovl == OR_Deleted) { |
| S.Diag(Best->Function->getLocation(), diag::note_unavailable_here) |
| << Best->Function->isDeleted(); |
| } else { |
| llvm_unreachable("Inconsistent overload resolution?"); |
| } |
| break; |
| } |
| |
| case OR_Success: |
| llvm_unreachable("Conversion did not fail!"); |
| break; |
| } |
| break; |
| |
| case FK_NonConstLValueReferenceBindingToTemporary: |
| case FK_NonConstLValueReferenceBindingToUnrelated: |
| S.Diag(Kind.getLocation(), |
| Failure == FK_NonConstLValueReferenceBindingToTemporary |
| ? diag::err_lvalue_reference_bind_to_temporary |
| : diag::err_lvalue_reference_bind_to_unrelated) |
| << DestType.getNonReferenceType().isVolatileQualified() |
| << DestType.getNonReferenceType() |
| << Args[0]->getType() |
| << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_RValueReferenceBindingToLValue: |
| S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref) |
| << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_ReferenceInitDropsQualifiers: |
| S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals) |
| << DestType.getNonReferenceType() |
| << Args[0]->getType() |
| << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_ReferenceInitFailed: |
| S.Diag(Kind.getLocation(), diag::err_reference_bind_failed) |
| << DestType.getNonReferenceType() |
| << (Args[0]->isLvalue(S.Context) == Expr::LV_Valid) |
| << Args[0]->getType() |
| << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_ConversionFailed: |
| S.Diag(Kind.getLocation(), diag::err_init_conversion_failed) |
| << (int)Entity.getKind() |
| << DestType |
| << (Args[0]->isLvalue(S.Context) == Expr::LV_Valid) |
| << Args[0]->getType() |
| << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_TooManyInitsForScalar: { |
| SourceRange R; |
| |
| if (InitListExpr *InitList = dyn_cast<InitListExpr>(Args[0])) |
| R = SourceRange(InitList->getInit(1)->getLocStart(), |
| InitList->getLocEnd()); |
| else |
| R = SourceRange(Args[0]->getLocStart(), Args[NumArgs - 1]->getLocEnd()); |
| |
| S.Diag(Kind.getLocation(), diag::err_excess_initializers) |
| << /*scalar=*/2 << R; |
| break; |
| } |
| |
| case FK_ReferenceBindingToInitList: |
| S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list) |
| << DestType.getNonReferenceType() << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_InitListBadDestinationType: |
| S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type) |
| << (DestType->isRecordType()) << DestType << Args[0]->getSourceRange(); |
| break; |
| |
| case FK_ConstructorOverloadFailed: { |
| SourceRange ArgsRange; |
| if (NumArgs) |
| ArgsRange = SourceRange(Args[0]->getLocStart(), |
| Args[NumArgs - 1]->getLocEnd()); |
| |
| // FIXME: Using "DestType" for the entity we're printing is probably |
| // bad. |
| switch (FailedOverloadResult) { |
| case OR_Ambiguous: |
| S.Diag(Kind.getLocation(), diag::err_ovl_ambiguous_init) |
| << DestType << ArgsRange; |
| S.PrintOverloadCandidates(FailedCandidateSet, |
| Sema::OCD_ViableCandidates, Args, NumArgs); |
| break; |
| |
| case OR_No_Viable_Function: |
| if (Kind.getKind() == InitializationKind::IK_Default && |
| (Entity.getKind() == InitializedEntity::EK_Base || |
| Entity.getKind() == InitializedEntity::EK_Member) && |
| isa<CXXConstructorDecl>(S.CurContext)) { |
| // This is implicit default initialization of a member or |
| // base within a constructor. If no viable function was |
| // found, notify the user that she needs to explicitly |
| // initialize this base/member. |
| CXXConstructorDecl *Constructor |
| = cast<CXXConstructorDecl>(S.CurContext); |
| if (Entity.getKind() == InitializedEntity::EK_Base) { |
| S.Diag(Kind.getLocation(), diag::err_missing_default_ctor) |
| << Constructor->isImplicit() |
| << S.Context.getTypeDeclType(Constructor->getParent()) |
| << /*base=*/0 |
| << Entity.getType(); |
| |
| RecordDecl *BaseDecl |
| = Entity.getBaseSpecifier()->getType()->getAs<RecordType>() |
| ->getDecl(); |
| S.Diag(BaseDecl->getLocation(), diag::note_previous_decl) |
| << S.Context.getTagDeclType(BaseDecl); |
| } else { |
| S.Diag(Kind.getLocation(), diag::err_missing_default_ctor) |
| << Constructor->isImplicit() |
| << S.Context.getTypeDeclType(Constructor->getParent()) |
| << /*member=*/1 |
| << Entity.getName(); |
| S.Diag(Entity.getDecl()->getLocation(), diag::note_field_decl); |
| |
| if (const RecordType *Record |
| = Entity.getType()->getAs<RecordType>()) |
| S.Diag(Record->getDecl()->getLocation(), |
| diag::note_previous_decl) |
| << S.Context.getTagDeclType(Record->getDecl()); |
| } |
| break; |
| } |
| |
| S.Diag(Kind.getLocation(), diag::err_ovl_no_viable_function_in_init) |
| << DestType << ArgsRange; |
| S.PrintOverloadCandidates(FailedCandidateSet, Sema::OCD_AllCandidates, |
| Args, NumArgs); |
| break; |
| |
| case OR_Deleted: { |
| S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init) |
| << true << DestType << ArgsRange; |
| OverloadCandidateSet::iterator Best; |
| OverloadingResult Ovl = S.BestViableFunction(FailedCandidateSet, |
| Kind.getLocation(), |
| Best); |
| if (Ovl == OR_Deleted) { |
| S.Diag(Best->Function->getLocation(), diag::note_unavailable_here) |
| << Best->Function->isDeleted(); |
| } else { |
| llvm_unreachable("Inconsistent overload resolution?"); |
| } |
| break; |
| } |
| |
| case OR_Success: |
| llvm_unreachable("Conversion did not fail!"); |
| break; |
| } |
| break; |
| } |
| |
| case FK_DefaultInitOfConst: |
| if (Entity.getKind() == InitializedEntity::EK_Member && |
| isa<CXXConstructorDecl>(S.CurContext)) { |
| // This is implicit default-initialization of a const member in |
| // a constructor. Complain that it needs to be explicitly |
| // initialized. |
| CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(S.CurContext); |
| S.Diag(Kind.getLocation(), diag::err_uninitialized_member_in_ctor) |
| << Constructor->isImplicit() |
| << S.Context.getTypeDeclType(Constructor->getParent()) |
| << /*const=*/1 |
| << Entity.getName(); |
| S.Diag(Entity.getDecl()->getLocation(), diag::note_previous_decl) |
| << Entity.getName(); |
| } else { |
| S.Diag(Kind.getLocation(), diag::err_default_init_const) |
| << DestType << (bool)DestType->getAs<RecordType>(); |
| } |
| break; |
| } |
| |
| return true; |
| } |
| |
| void InitializationSequence::dump(llvm::raw_ostream &OS) const { |
| switch (SequenceKind) { |
| case FailedSequence: { |
| OS << "Failed sequence: "; |
| switch (Failure) { |
| case FK_TooManyInitsForReference: |
| OS << "too many initializers for reference"; |
| break; |
| |
| case FK_ArrayNeedsInitList: |
| OS << "array requires initializer list"; |
| break; |
| |
| case FK_ArrayNeedsInitListOrStringLiteral: |
| OS << "array requires initializer list or string literal"; |
| break; |
| |
| case FK_AddressOfOverloadFailed: |
| OS << "address of overloaded function failed"; |
| break; |
| |
| case FK_ReferenceInitOverloadFailed: |
| OS << "overload resolution for reference initialization failed"; |
| break; |
| |
| case FK_NonConstLValueReferenceBindingToTemporary: |
| OS << "non-const lvalue reference bound to temporary"; |
| break; |
| |
| case FK_NonConstLValueReferenceBindingToUnrelated: |
| OS << "non-const lvalue reference bound to unrelated type"; |
| break; |
| |
| case FK_RValueReferenceBindingToLValue: |
| OS << "rvalue reference bound to an lvalue"; |
| break; |
| |
| case FK_ReferenceInitDropsQualifiers: |
| OS << "reference initialization drops qualifiers"; |
| break; |
| |
| case FK_ReferenceInitFailed: |
| OS << "reference initialization failed"; |
| break; |
| |
| case FK_ConversionFailed: |
| OS << "conversion failed"; |
| break; |
| |
| case FK_TooManyInitsForScalar: |
| OS << "too many initializers for scalar"; |
| break; |
| |
| case FK_ReferenceBindingToInitList: |
| OS << "referencing binding to initializer list"; |
| break; |
| |
| case FK_InitListBadDestinationType: |
| OS << "initializer list for non-aggregate, non-scalar type"; |
| break; |
| |
| case FK_UserConversionOverloadFailed: |
| OS << "overloading failed for user-defined conversion"; |
| break; |
| |
| case FK_ConstructorOverloadFailed: |
| OS << "constructor overloading failed"; |
| break; |
| |
| case FK_DefaultInitOfConst: |
| OS << "default initialization of a const variable"; |
| break; |
| } |
| OS << '\n'; |
| return; |
| } |
| |
| case DependentSequence: |
| OS << "Dependent sequence: "; |
| return; |
| |
| case UserDefinedConversion: |
| OS << "User-defined conversion sequence: "; |
| break; |
| |
| case ConstructorInitialization: |
| OS << "Constructor initialization sequence: "; |
| break; |
| |
| case ReferenceBinding: |
| OS << "Reference binding: "; |
| break; |
| |
| case ListInitialization: |
| OS << "List initialization: "; |
| break; |
| |
| case ZeroInitialization: |
| OS << "Zero initialization\n"; |
| return; |
| |
| case NoInitialization: |
| OS << "No initialization\n"; |
| return; |
| |
| case StandardConversion: |
| OS << "Standard conversion: "; |
| break; |
| |
| case CAssignment: |
| OS << "C assignment: "; |
| break; |
| |
| case StringInit: |
| OS << "String initialization: "; |
| break; |
| } |
| |
| for (step_iterator S = step_begin(), SEnd = step_end(); S != SEnd; ++S) { |
| if (S != step_begin()) { |
| OS << " -> "; |
| } |
| |
| switch (S->Kind) { |
| case SK_ResolveAddressOfOverloadedFunction: |
| OS << "resolve address of overloaded function"; |
| break; |
| |
| case SK_CastDerivedToBaseRValue: |
| OS << "derived-to-base case (rvalue" << S->Type.getAsString() << ")"; |
| break; |
| |
| case SK_CastDerivedToBaseLValue: |
| OS << "derived-to-base case (lvalue" << S->Type.getAsString() << ")"; |
| break; |
| |
| case SK_BindReference: |
| OS << "bind reference to lvalue"; |
| break; |
| |
| case SK_BindReferenceToTemporary: |
| OS << "bind reference to a temporary"; |
| break; |
| |
| case SK_UserConversion: |
| OS << "user-defined conversion via " << S->Function->getNameAsString(); |
| break; |
| |
| case SK_QualificationConversionRValue: |
| OS << "qualification conversion (rvalue)"; |
| |
| case SK_QualificationConversionLValue: |
| OS << "qualification conversion (lvalue)"; |
| break; |
| |
| case SK_ConversionSequence: |
| OS << "implicit conversion sequence ("; |
| S->ICS->DebugPrint(); // FIXME: use OS |
| OS << ")"; |
| break; |
| |
| case SK_ListInitialization: |
| OS << "list initialization"; |
| break; |
| |
| case SK_ConstructorInitialization: |
| OS << "constructor initialization"; |
| break; |
| |
| case SK_ZeroInitialization: |
| OS << "zero initialization"; |
| break; |
| |
| case SK_CAssignment: |
| OS << "C assignment"; |
| break; |
| |
| case SK_StringInit: |
| OS << "string initialization"; |
| break; |
| } |
| } |
| } |
| |
| void InitializationSequence::dump() const { |
| dump(llvm::errs()); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Initialization helper functions |
| //===----------------------------------------------------------------------===// |
| Sema::OwningExprResult |
| Sema::PerformCopyInitialization(const InitializedEntity &Entity, |
| SourceLocation EqualLoc, |
| OwningExprResult Init) { |
| if (Init.isInvalid()) |
| return ExprError(); |
| |
| Expr *InitE = (Expr *)Init.get(); |
| assert(InitE && "No initialization expression?"); |
| |
| if (EqualLoc.isInvalid()) |
| EqualLoc = InitE->getLocStart(); |
| |
| InitializationKind Kind = InitializationKind::CreateCopy(InitE->getLocStart(), |
| EqualLoc); |
| InitializationSequence Seq(*this, Entity, Kind, &InitE, 1); |
| Init.release(); |
| return Seq.Perform(*this, Entity, Kind, |
| MultiExprArg(*this, (void**)&InitE, 1)); |
| } |