| //===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===// |
| // |
| // 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 C++ expressions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Sema.h" |
| #include "clang/AST/ExprCXX.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/TargetInfo.h" |
| using namespace clang; |
| |
| /// ActOnCXXConversionFunctionExpr - Parse a C++ conversion function |
| /// name (e.g., operator void const *) as an expression. This is |
| /// very similar to ActOnIdentifierExpr, except that instead of |
| /// providing an identifier the parser provides the type of the |
| /// conversion function. |
| Sema::ExprResult |
| Sema::ActOnCXXConversionFunctionExpr(Scope *S, SourceLocation OperatorLoc, |
| TypeTy *Ty, bool HasTrailingLParen, |
| const CXXScopeSpec &SS) { |
| QualType ConvType = QualType::getFromOpaquePtr(Ty); |
| QualType ConvTypeCanon = Context.getCanonicalType(ConvType); |
| DeclarationName ConvName |
| = Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon); |
| return ActOnDeclarationNameExpr(S, OperatorLoc, ConvName, HasTrailingLParen, |
| &SS); |
| } |
| |
| /// ActOnCXXOperatorFunctionIdExpr - Parse a C++ overloaded operator |
| /// name (e.g., @c operator+ ) as an expression. This is very |
| /// similar to ActOnIdentifierExpr, except that instead of providing |
| /// an identifier the parser provides the kind of overloaded |
| /// operator that was parsed. |
| Sema::ExprResult |
| Sema::ActOnCXXOperatorFunctionIdExpr(Scope *S, SourceLocation OperatorLoc, |
| OverloadedOperatorKind Op, |
| bool HasTrailingLParen, |
| const CXXScopeSpec &SS) { |
| DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(Op); |
| return ActOnDeclarationNameExpr(S, OperatorLoc, Name, HasTrailingLParen, &SS); |
| } |
| |
| /// ActOnCXXTypeidOfType - Parse typeid( type-id ). |
| Action::ExprResult |
| Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc, |
| bool isType, void *TyOrExpr, SourceLocation RParenLoc) { |
| const NamespaceDecl *StdNs = GetStdNamespace(); |
| if (!StdNs) |
| return Diag(OpLoc, diag::err_need_header_before_typeid); |
| |
| IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info"); |
| Decl *TypeInfoDecl = LookupDecl(TypeInfoII, |
| Decl::IDNS_Tag | Decl::IDNS_Ordinary, |
| 0, StdNs, /*createBuiltins=*/false); |
| RecordDecl *TypeInfoRecordDecl = dyn_cast_or_null<RecordDecl>(TypeInfoDecl); |
| if (!TypeInfoRecordDecl) |
| return Diag(OpLoc, diag::err_need_header_before_typeid); |
| |
| QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl); |
| |
| return new CXXTypeidExpr(isType, TyOrExpr, TypeInfoType.withConst(), |
| SourceRange(OpLoc, RParenLoc)); |
| } |
| |
| /// ActOnCXXBoolLiteral - Parse {true,false} literals. |
| Action::ExprResult |
| Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) { |
| assert((Kind == tok::kw_true || Kind == tok::kw_false) && |
| "Unknown C++ Boolean value!"); |
| return new CXXBoolLiteralExpr(Kind == tok::kw_true, Context.BoolTy, OpLoc); |
| } |
| |
| /// ActOnCXXThrow - Parse throw expressions. |
| Action::ExprResult |
| Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprTy *E) { |
| return new CXXThrowExpr((Expr*)E, Context.VoidTy, OpLoc); |
| } |
| |
| Action::ExprResult Sema::ActOnCXXThis(SourceLocation ThisLoc) { |
| /// C++ 9.3.2: In the body of a non-static member function, the keyword this |
| /// is a non-lvalue expression whose value is the address of the object for |
| /// which the function is called. |
| |
| if (!isa<FunctionDecl>(CurContext)) { |
| Diag(ThisLoc, diag::err_invalid_this_use); |
| return ExprResult(true); |
| } |
| |
| if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) |
| if (MD->isInstance()) |
| return new CXXThisExpr(ThisLoc, MD->getThisType(Context)); |
| |
| return Diag(ThisLoc, diag::err_invalid_this_use); |
| } |
| |
| /// ActOnCXXTypeConstructExpr - Parse construction of a specified type. |
| /// Can be interpreted either as function-style casting ("int(x)") |
| /// or class type construction ("ClassType(x,y,z)") |
| /// or creation of a value-initialized type ("int()"). |
| Action::ExprResult |
| Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep, |
| SourceLocation LParenLoc, |
| ExprTy **ExprTys, unsigned NumExprs, |
| SourceLocation *CommaLocs, |
| SourceLocation RParenLoc) { |
| assert(TypeRep && "Missing type!"); |
| QualType Ty = QualType::getFromOpaquePtr(TypeRep); |
| Expr **Exprs = (Expr**)ExprTys; |
| SourceLocation TyBeginLoc = TypeRange.getBegin(); |
| SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc); |
| |
| if (const RecordType *RT = Ty->getAsRecordType()) { |
| // C++ 5.2.3p1: |
| // If the simple-type-specifier specifies a class type, the class type shall |
| // be complete. |
| // |
| if (!RT->getDecl()->isDefinition()) |
| return Diag(TyBeginLoc, diag::err_invalid_incomplete_type_use) |
| << Ty << FullRange; |
| |
| unsigned DiagID = PP.getDiagnostics().getCustomDiagID(Diagnostic::Error, |
| "class constructors are not supported yet"); |
| return Diag(TyBeginLoc, DiagID); |
| } |
| |
| // C++ 5.2.3p1: |
| // If the expression list is a single expression, the type conversion |
| // expression is equivalent (in definedness, and if defined in meaning) to the |
| // corresponding cast expression. |
| // |
| if (NumExprs == 1) { |
| if (CheckCastTypes(TypeRange, Ty, Exprs[0])) |
| return true; |
| return new CXXFunctionalCastExpr(Ty.getNonReferenceType(), Ty, TyBeginLoc, |
| Exprs[0], RParenLoc); |
| } |
| |
| // C++ 5.2.3p1: |
| // If the expression list specifies more than a single value, the type shall |
| // be a class with a suitably declared constructor. |
| // |
| if (NumExprs > 1) |
| return Diag(CommaLocs[0], diag::err_builtin_func_cast_more_than_one_arg) |
| << FullRange; |
| |
| assert(NumExprs == 0 && "Expected 0 expressions"); |
| |
| // C++ 5.2.3p2: |
| // The expression T(), where T is a simple-type-specifier for a non-array |
| // complete object type or the (possibly cv-qualified) void type, creates an |
| // rvalue of the specified type, which is value-initialized. |
| // |
| if (Ty->isArrayType()) |
| return Diag(TyBeginLoc, diag::err_value_init_for_array_type) << FullRange; |
| if (!Ty->isDependentType() && Ty->isIncompleteType() && !Ty->isVoidType()) |
| return Diag(TyBeginLoc, diag::err_invalid_incomplete_type_use) |
| << Ty << FullRange; |
| |
| return new CXXZeroInitValueExpr(Ty, TyBeginLoc, RParenLoc); |
| } |
| |
| |
| /// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.: |
| /// @code new (memory) int[size][4] @endcode |
| /// or |
| /// @code ::new Foo(23, "hello") @endcode |
| /// For the interpretation of this heap of arguments, consult the base version. |
| Action::ExprResult |
| Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal, |
| SourceLocation PlacementLParen, |
| ExprTy **PlacementArgs, unsigned NumPlaceArgs, |
| SourceLocation PlacementRParen, bool ParenTypeId, |
| Declarator &D, SourceLocation ConstructorLParen, |
| ExprTy **ConstructorArgs, unsigned NumConsArgs, |
| SourceLocation ConstructorRParen) |
| { |
| // FIXME: Throughout this function, we have rather bad location information. |
| // Implementing Declarator::getSourceRange() would go a long way toward |
| // fixing that. |
| |
| Expr *ArraySize = 0; |
| unsigned Skip = 0; |
| // If the specified type is an array, unwrap it and save the expression. |
| if (D.getNumTypeObjects() > 0 && |
| D.getTypeObject(0).Kind == DeclaratorChunk::Array) { |
| DeclaratorChunk &Chunk = D.getTypeObject(0); |
| if (Chunk.Arr.hasStatic) |
| return Diag(Chunk.Loc, diag::err_static_illegal_in_new); |
| if (!Chunk.Arr.NumElts) |
| return Diag(Chunk.Loc, diag::err_array_new_needs_size); |
| ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts); |
| Skip = 1; |
| } |
| |
| QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, Skip); |
| if (D.getInvalidType()) |
| return true; |
| |
| if (CheckAllocatedType(AllocType, D)) |
| return true; |
| |
| QualType ResultType = Context.getPointerType(AllocType); |
| |
| // That every array dimension except the first is constant was already |
| // checked by the type check above. |
| |
| // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral |
| // or enumeration type with a non-negative value." |
| if (ArraySize) { |
| QualType SizeType = ArraySize->getType(); |
| if (!SizeType->isIntegralType() && !SizeType->isEnumeralType()) |
| return Diag(ArraySize->getSourceRange().getBegin(), |
| diag::err_array_size_not_integral) |
| << SizeType << ArraySize->getSourceRange(); |
| // Let's see if this is a constant < 0. If so, we reject it out of hand. |
| // We don't care about special rules, so we tell the machinery it's not |
| // evaluated - it gives us a result in more cases. |
| llvm::APSInt Value; |
| if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) { |
| if (Value < llvm::APSInt( |
| llvm::APInt::getNullValue(Value.getBitWidth()), false)) |
| return Diag(ArraySize->getSourceRange().getBegin(), |
| diag::err_typecheck_negative_array_size) |
| << ArraySize->getSourceRange(); |
| } |
| } |
| |
| FunctionDecl *OperatorNew = 0; |
| FunctionDecl *OperatorDelete = 0; |
| Expr **PlaceArgs = (Expr**)PlacementArgs; |
| if (FindAllocationFunctions(StartLoc, UseGlobal, AllocType, ArraySize, |
| PlaceArgs, NumPlaceArgs, OperatorNew, |
| OperatorDelete)) |
| return true; |
| |
| bool Init = ConstructorLParen.isValid(); |
| // --- Choosing a constructor --- |
| // C++ 5.3.4p15 |
| // 1) If T is a POD and there's no initializer (ConstructorLParen is invalid) |
| // the object is not initialized. If the object, or any part of it, is |
| // const-qualified, it's an error. |
| // 2) If T is a POD and there's an empty initializer, the object is value- |
| // initialized. |
| // 3) If T is a POD and there's one initializer argument, the object is copy- |
| // constructed. |
| // 4) If T is a POD and there's more initializer arguments, it's an error. |
| // 5) If T is not a POD, the initializer arguments are used as constructor |
| // arguments. |
| // |
| // Or by the C++0x formulation: |
| // 1) If there's no initializer, the object is default-initialized according |
| // to C++0x rules. |
| // 2) Otherwise, the object is direct-initialized. |
| CXXConstructorDecl *Constructor = 0; |
| Expr **ConsArgs = (Expr**)ConstructorArgs; |
| if (const RecordType *RT = AllocType->getAsRecordType()) { |
| // FIXME: This is incorrect for when there is an empty initializer and |
| // no user-defined constructor. Must zero-initialize, not default-construct. |
| Constructor = PerformInitializationByConstructor( |
| AllocType, ConsArgs, NumConsArgs, |
| D.getDeclSpec().getSourceRange().getBegin(), |
| SourceRange(D.getDeclSpec().getSourceRange().getBegin(), |
| ConstructorRParen), |
| RT->getDecl()->getDeclName(), |
| NumConsArgs != 0 ? IK_Direct : IK_Default); |
| if (!Constructor) |
| return true; |
| } else { |
| if (!Init) { |
| // FIXME: Check that no subpart is const. |
| if (AllocType.isConstQualified()) { |
| Diag(StartLoc, diag::err_new_uninitialized_const) |
| << D.getSourceRange(); |
| return true; |
| } |
| } else if (NumConsArgs == 0) { |
| // Object is value-initialized. Do nothing. |
| } else if (NumConsArgs == 1) { |
| // Object is direct-initialized. |
| // FIXME: WHAT DeclarationName do we pass in here? |
| if (CheckInitializerTypes(ConsArgs[0], AllocType, StartLoc, |
| DeclarationName() /*AllocType.getAsString()*/)) |
| return true; |
| } else { |
| Diag(StartLoc, diag::err_builtin_direct_init_more_than_one_arg) |
| << SourceRange(ConstructorLParen, ConstructorRParen); |
| } |
| } |
| |
| // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16) |
| |
| return new CXXNewExpr(UseGlobal, OperatorNew, PlaceArgs, NumPlaceArgs, |
| ParenTypeId, ArraySize, Constructor, Init, |
| ConsArgs, NumConsArgs, OperatorDelete, ResultType, |
| StartLoc, Init ? ConstructorRParen : SourceLocation()); |
| } |
| |
| /// CheckAllocatedType - Checks that a type is suitable as the allocated type |
| /// in a new-expression. |
| /// dimension off and stores the size expression in ArraySize. |
| bool Sema::CheckAllocatedType(QualType AllocType, const Declarator &D) |
| { |
| // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an |
| // abstract class type or array thereof. |
| // FIXME: We don't have abstract types yet. |
| // FIXME: Under C++ semantics, an incomplete object type is still an object |
| // type. This code assumes the C semantics, where it's not. |
| if (!AllocType->isObjectType()) { |
| unsigned type; // For the select in the message. |
| if (AllocType->isFunctionType()) { |
| type = 0; |
| } else if(AllocType->isIncompleteType()) { |
| type = 1; |
| } else { |
| assert(AllocType->isReferenceType() && "What else could it be?"); |
| type = 2; |
| } |
| SourceRange TyR = D.getDeclSpec().getSourceRange(); |
| // FIXME: This is very much a guess and won't work for, e.g., pointers. |
| if (D.getNumTypeObjects() > 0) |
| TyR.setEnd(D.getTypeObject(0).Loc); |
| Diag(TyR.getBegin(), diag::err_bad_new_type) |
| << AllocType.getAsString() << type << TyR; |
| return true; |
| } |
| |
| // Every dimension shall be of constant size. |
| unsigned i = 1; |
| while (const ArrayType *Array = Context.getAsArrayType(AllocType)) { |
| if (!Array->isConstantArrayType()) { |
| Diag(D.getTypeObject(i).Loc, diag::err_new_array_nonconst) |
| << static_cast<Expr*>(D.getTypeObject(i).Arr.NumElts)->getSourceRange(); |
| return true; |
| } |
| AllocType = Array->getElementType(); |
| ++i; |
| } |
| |
| return false; |
| } |
| |
| /// FindAllocationFunctions - Finds the overloads of operator new and delete |
| /// that are appropriate for the allocation. |
| bool Sema::FindAllocationFunctions(SourceLocation StartLoc, bool UseGlobal, |
| QualType AllocType, bool IsArray, |
| Expr **PlaceArgs, unsigned NumPlaceArgs, |
| FunctionDecl *&OperatorNew, |
| FunctionDecl *&OperatorDelete) |
| { |
| // --- Choosing an allocation function --- |
| // C++ 5.3.4p8 - 14 & 18 |
| // 1) If UseGlobal is true, only look in the global scope. Else, also look |
| // in the scope of the allocated class. |
| // 2) If an array size is given, look for operator new[], else look for |
| // operator new. |
| // 3) The first argument is always size_t. Append the arguments from the |
| // placement form. |
| // FIXME: Also find the appropriate delete operator. |
| |
| llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs); |
| // We don't care about the actual value of this argument. |
| // FIXME: Should the Sema create the expression and embed it in the syntax |
| // tree? Or should the consumer just recalculate the value? |
| AllocArgs[0] = new IntegerLiteral(llvm::APInt::getNullValue( |
| Context.Target.getPointerWidth(0)), |
| Context.getSizeType(), |
| SourceLocation()); |
| std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1); |
| |
| DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName( |
| IsArray ? OO_Array_New : OO_New); |
| if (AllocType->isRecordType() && !UseGlobal) { |
| CXXRecordDecl *Record = cast<CXXRecordType>(AllocType->getAsRecordType()) |
| ->getDecl(); |
| // FIXME: We fail to find inherited overloads. |
| if (FindAllocationOverload(StartLoc, NewName, &AllocArgs[0], |
| AllocArgs.size(), Record, /*AllowMissing=*/true, |
| OperatorNew)) |
| return true; |
| } |
| if (!OperatorNew) { |
| // Didn't find a member overload. Look for a global one. |
| DeclareGlobalNewDelete(); |
| DeclContext *TUDecl = Context.getTranslationUnitDecl(); |
| if (FindAllocationOverload(StartLoc, NewName, &AllocArgs[0], |
| AllocArgs.size(), TUDecl, /*AllowMissing=*/false, |
| OperatorNew)) |
| return true; |
| } |
| |
| // FIXME: This is leaked on error. But so much is currently in Sema that it's |
| // easier to clean it in one go. |
| AllocArgs[0]->Destroy(Context); |
| return false; |
| } |
| |
| /// FindAllocationOverload - Find an fitting overload for the allocation |
| /// function in the specified scope. |
| bool Sema::FindAllocationOverload(SourceLocation StartLoc, DeclarationName Name, |
| Expr** Args, unsigned NumArgs, |
| DeclContext *Ctx, bool AllowMissing, |
| FunctionDecl *&Operator) |
| { |
| DeclContext::lookup_result Lookup = Ctx->lookup(Context, Name); |
| if (Lookup.first == Lookup.second) { |
| if (AllowMissing) |
| return false; |
| // FIXME: Bad location information. |
| return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call) |
| << Name << 0; |
| } |
| |
| OverloadCandidateSet Candidates; |
| NamedDecl *Decl = *Lookup.first; |
| // Even member operator new/delete are implicitly treated as static, so don't |
| // use AddMemberCandidate. |
| if (FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Decl)) |
| AddOverloadCandidate(Fn, Args, NumArgs, Candidates, |
| /*SuppressUserConversions=*/false); |
| else if (OverloadedFunctionDecl *Ovl |
| = dyn_cast_or_null<OverloadedFunctionDecl>(Decl)) { |
| for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), |
| FEnd = Ovl->function_end(); |
| F != FEnd; ++F) { |
| if (FunctionDecl *Fn = *F) |
| AddOverloadCandidate(Fn, Args, NumArgs, Candidates, |
| /*SuppressUserConversions=*/false); |
| } |
| } |
| |
| // Do the resolution. |
| OverloadCandidateSet::iterator Best; |
| switch(BestViableFunction(Candidates, Best)) { |
| case OR_Success: { |
| // Got one! |
| FunctionDecl *FnDecl = Best->Function; |
| // The first argument is size_t, and the first parameter must be size_t, |
| // too. This is checked on declaration and can be assumed. (It can't be |
| // asserted on, though, since invalid decls are left in there.) |
| for (unsigned i = 1; i < NumArgs; ++i) { |
| // FIXME: Passing word to diagnostic. |
| if (PerformCopyInitialization(Args[i-1], |
| FnDecl->getParamDecl(i)->getType(), |
| "passing")) |
| return true; |
| } |
| Operator = FnDecl; |
| return false; |
| } |
| |
| case OR_No_Viable_Function: |
| if (AllowMissing) |
| return false; |
| // FIXME: Bad location information. |
| Diag(StartLoc, diag::err_ovl_no_viable_function_in_call) |
| << Name << (unsigned)Candidates.size(); |
| PrintOverloadCandidates(Candidates, /*OnlyViable=*/false); |
| return true; |
| |
| case OR_Ambiguous: |
| // FIXME: Bad location information. |
| Diag(StartLoc, diag::err_ovl_ambiguous_call) |
| << Name; |
| PrintOverloadCandidates(Candidates, /*OnlyViable=*/true); |
| return true; |
| } |
| assert(false && "Unreachable, bad result from BestViableFunction"); |
| return true; |
| } |
| |
| |
| /// DeclareGlobalNewDelete - Declare the global forms of operator new and |
| /// delete. These are: |
| /// @code |
| /// void* operator new(std::size_t) throw(std::bad_alloc); |
| /// void* operator new[](std::size_t) throw(std::bad_alloc); |
| /// void operator delete(void *) throw(); |
| /// void operator delete[](void *) throw(); |
| /// @endcode |
| /// Note that the placement and nothrow forms of new are *not* implicitly |
| /// declared. Their use requires including \<new\>. |
| void Sema::DeclareGlobalNewDelete() |
| { |
| if (GlobalNewDeleteDeclared) |
| return; |
| GlobalNewDeleteDeclared = true; |
| |
| QualType VoidPtr = Context.getPointerType(Context.VoidTy); |
| QualType SizeT = Context.getSizeType(); |
| |
| // FIXME: Exception specifications are not added. |
| DeclareGlobalAllocationFunction( |
| Context.DeclarationNames.getCXXOperatorName(OO_New), |
| VoidPtr, SizeT); |
| DeclareGlobalAllocationFunction( |
| Context.DeclarationNames.getCXXOperatorName(OO_Array_New), |
| VoidPtr, SizeT); |
| DeclareGlobalAllocationFunction( |
| Context.DeclarationNames.getCXXOperatorName(OO_Delete), |
| Context.VoidTy, VoidPtr); |
| DeclareGlobalAllocationFunction( |
| Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete), |
| Context.VoidTy, VoidPtr); |
| } |
| |
| /// DeclareGlobalAllocationFunction - Declares a single implicit global |
| /// allocation function if it doesn't already exist. |
| void Sema::DeclareGlobalAllocationFunction(DeclarationName Name, |
| QualType Return, QualType Argument) |
| { |
| DeclContext *GlobalCtx = Context.getTranslationUnitDecl(); |
| |
| // Check if this function is already declared. |
| IdentifierResolver::iterator I = IdResolver.begin(Name, GlobalCtx, |
| /*CheckParent=*/false); |
| |
| if (I != IdResolver.end()) { |
| NamedDecl *Decl = *I; |
| if (FunctionDecl *Fn = dyn_cast<FunctionDecl>(Decl)) { |
| // The return type fits. This is checked when the function is declared. |
| if (Fn->getNumParams() == 1 && |
| Context.getCanonicalType(Fn->getParamDecl(0)->getType()) == Argument) |
| return; |
| } else if(OverloadedFunctionDecl *Ovl = |
| dyn_cast<OverloadedFunctionDecl>(Decl)) { |
| for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), |
| FEnd = Ovl->function_end(); |
| F != FEnd; ++F) { |
| if ((*F)->getNumParams() == 1 && |
| Context.getCanonicalType((*F)->getParamDecl(0)->getType()) |
| == Argument) |
| return; |
| } |
| } |
| } |
| |
| QualType FnType = Context.getFunctionType(Return, &Argument, 1, false, 0); |
| FunctionDecl *Alloc = |
| FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name, |
| FnType, FunctionDecl::None, false, 0, |
| SourceLocation()); |
| Alloc->setImplicit(); |
| ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(), |
| 0, Argument, VarDecl::None, 0, 0); |
| Alloc->setParams(&Param, 1); |
| |
| PushOnScopeChains(Alloc, TUScope); |
| } |
| |
| /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in: |
| /// @code ::delete ptr; @endcode |
| /// or |
| /// @code delete [] ptr; @endcode |
| Action::ExprResult |
| Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal, |
| bool ArrayForm, ExprTy *Operand) |
| { |
| // C++ 5.3.5p1: "The operand shall have a pointer type, or a class type |
| // having a single conversion function to a pointer type. The result has |
| // type void." |
| // DR599 amends "pointer type" to "pointer to object type" in both cases. |
| |
| Expr *Ex = (Expr *)Operand; |
| QualType Type = Ex->getType(); |
| |
| if (Type->isRecordType()) { |
| // FIXME: Find that one conversion function and amend the type. |
| } |
| |
| if (!Type->isPointerType()) { |
| Diag(StartLoc, diag::err_delete_operand) << Type << Ex->getSourceRange(); |
| return true; |
| } |
| |
| QualType Pointee = Type->getAsPointerType()->getPointeeType(); |
| if (Pointee->isIncompleteType() && !Pointee->isVoidType()) |
| Diag(StartLoc, diag::warn_delete_incomplete) |
| << Pointee << Ex->getSourceRange(); |
| else if (!Pointee->isObjectType()) { |
| Diag(StartLoc, diag::err_delete_operand) |
| << Type << Ex->getSourceRange(); |
| return true; |
| } |
| |
| // FIXME: Look up the correct operator delete overload and pass a pointer |
| // along. |
| // FIXME: Check access and ambiguity of operator delete and destructor. |
| |
| return new CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm, 0, Ex, |
| StartLoc); |
| } |
| |
| |
| /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a |
| /// C++ if/switch/while/for statement. |
| /// e.g: "if (int x = f()) {...}" |
| Action::ExprResult |
| Sema::ActOnCXXConditionDeclarationExpr(Scope *S, SourceLocation StartLoc, |
| Declarator &D, |
| SourceLocation EqualLoc, |
| ExprTy *AssignExprVal) { |
| assert(AssignExprVal && "Null assignment expression"); |
| |
| // C++ 6.4p2: |
| // The declarator shall not specify a function or an array. |
| // The type-specifier-seq shall not contain typedef and shall not declare a |
| // new class or enumeration. |
| |
| assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && |
| "Parser allowed 'typedef' as storage class of condition decl."); |
| |
| QualType Ty = GetTypeForDeclarator(D, S); |
| |
| if (Ty->isFunctionType()) { // The declarator shall not specify a function... |
| // We exit without creating a CXXConditionDeclExpr because a FunctionDecl |
| // would be created and CXXConditionDeclExpr wants a VarDecl. |
| return Diag(StartLoc, diag::err_invalid_use_of_function_type) |
| << SourceRange(StartLoc, EqualLoc); |
| } else if (Ty->isArrayType()) { // ...or an array. |
| Diag(StartLoc, diag::err_invalid_use_of_array_type) |
| << SourceRange(StartLoc, EqualLoc); |
| } else if (const RecordType *RT = Ty->getAsRecordType()) { |
| RecordDecl *RD = RT->getDecl(); |
| // The type-specifier-seq shall not declare a new class... |
| if (RD->isDefinition() && (RD->getIdentifier() == 0 || S->isDeclScope(RD))) |
| Diag(RD->getLocation(), diag::err_type_defined_in_condition); |
| } else if (const EnumType *ET = Ty->getAsEnumType()) { |
| EnumDecl *ED = ET->getDecl(); |
| // ...or enumeration. |
| if (ED->isDefinition() && (ED->getIdentifier() == 0 || S->isDeclScope(ED))) |
| Diag(ED->getLocation(), diag::err_type_defined_in_condition); |
| } |
| |
| DeclTy *Dcl = ActOnDeclarator(S, D, 0); |
| if (!Dcl) |
| return true; |
| AddInitializerToDecl(Dcl, ExprArg(*this, AssignExprVal)); |
| |
| // Mark this variable as one that is declared within a conditional. |
| if (VarDecl *VD = dyn_cast<VarDecl>((Decl *)Dcl)) |
| VD->setDeclaredInCondition(true); |
| |
| return new CXXConditionDeclExpr(StartLoc, EqualLoc, |
| cast<VarDecl>(static_cast<Decl *>(Dcl))); |
| } |
| |
| /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid. |
| bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) { |
| // C++ 6.4p4: |
| // The value of a condition that is an initialized declaration in a statement |
| // other than a switch statement is the value of the declared variable |
| // implicitly converted to type bool. If that conversion is ill-formed, the |
| // program is ill-formed. |
| // The value of a condition that is an expression is the value of the |
| // expression, implicitly converted to bool. |
| // |
| QualType Ty = CondExpr->getType(); // Save the type. |
| AssignConvertType |
| ConvTy = CheckSingleAssignmentConstraints(Context.BoolTy, CondExpr); |
| if (ConvTy == Incompatible) |
| return Diag(CondExpr->getLocStart(), diag::err_typecheck_bool_condition) |
| << Ty << CondExpr->getSourceRange(); |
| return false; |
| } |
| |
| /// Helper function to determine whether this is the (deprecated) C++ |
| /// conversion from a string literal to a pointer to non-const char or |
| /// non-const wchar_t (for narrow and wide string literals, |
| /// respectively). |
| bool |
| Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) { |
| // Look inside the implicit cast, if it exists. |
| if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From)) |
| From = Cast->getSubExpr(); |
| |
| // A string literal (2.13.4) that is not a wide string literal can |
| // be converted to an rvalue of type "pointer to char"; a wide |
| // string literal can be converted to an rvalue of type "pointer |
| // to wchar_t" (C++ 4.2p2). |
| if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From)) |
| if (const PointerType *ToPtrType = ToType->getAsPointerType()) |
| if (const BuiltinType *ToPointeeType |
| = ToPtrType->getPointeeType()->getAsBuiltinType()) { |
| // This conversion is considered only when there is an |
| // explicit appropriate pointer target type (C++ 4.2p2). |
| if (ToPtrType->getPointeeType().getCVRQualifiers() == 0 && |
| ((StrLit->isWide() && ToPointeeType->isWideCharType()) || |
| (!StrLit->isWide() && |
| (ToPointeeType->getKind() == BuiltinType::Char_U || |
| ToPointeeType->getKind() == BuiltinType::Char_S)))) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /// PerformImplicitConversion - Perform an implicit conversion of the |
| /// expression From to the type ToType. Returns true if there was an |
| /// error, false otherwise. The expression From is replaced with the |
| /// converted expression. Flavor is the kind of conversion we're |
| /// performing, used in the error message. |
| bool |
| Sema::PerformImplicitConversion(Expr *&From, QualType ToType, |
| const char *Flavor) |
| { |
| ImplicitConversionSequence ICS = TryImplicitConversion(From, ToType); |
| switch (ICS.ConversionKind) { |
| case ImplicitConversionSequence::StandardConversion: |
| if (PerformImplicitConversion(From, ToType, ICS.Standard, Flavor)) |
| return true; |
| break; |
| |
| case ImplicitConversionSequence::UserDefinedConversion: |
| // FIXME: This is, of course, wrong. We'll need to actually call |
| // the constructor or conversion operator, and then cope with the |
| // standard conversions. |
| ImpCastExprToType(From, ToType); |
| return false; |
| |
| case ImplicitConversionSequence::EllipsisConversion: |
| assert(false && "Cannot perform an ellipsis conversion"); |
| return false; |
| |
| case ImplicitConversionSequence::BadConversion: |
| return true; |
| } |
| |
| // Everything went well. |
| return false; |
| } |
| |
| /// PerformImplicitConversion - Perform an implicit conversion of the |
| /// expression From to the type ToType by following the standard |
| /// conversion sequence SCS. Returns true if there was an error, false |
| /// otherwise. The expression From is replaced with the converted |
| /// expression. Flavor is the context in which we're performing this |
| /// conversion, for use in error messages. |
| bool |
| Sema::PerformImplicitConversion(Expr *&From, QualType ToType, |
| const StandardConversionSequence& SCS, |
| const char *Flavor) |
| { |
| // Overall FIXME: we are recomputing too many types here and doing |
| // far too much extra work. What this means is that we need to keep |
| // track of more information that is computed when we try the |
| // implicit conversion initially, so that we don't need to recompute |
| // anything here. |
| QualType FromType = From->getType(); |
| |
| if (SCS.CopyConstructor) { |
| // FIXME: Create a temporary object by calling the copy |
| // constructor. |
| ImpCastExprToType(From, ToType); |
| return false; |
| } |
| |
| // Perform the first implicit conversion. |
| switch (SCS.First) { |
| case ICK_Identity: |
| case ICK_Lvalue_To_Rvalue: |
| // Nothing to do. |
| break; |
| |
| case ICK_Array_To_Pointer: |
| if (FromType->isOverloadType()) { |
| FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, true); |
| if (!Fn) |
| return true; |
| |
| FixOverloadedFunctionReference(From, Fn); |
| FromType = From->getType(); |
| } else { |
| FromType = Context.getArrayDecayedType(FromType); |
| } |
| ImpCastExprToType(From, FromType); |
| break; |
| |
| case ICK_Function_To_Pointer: |
| FromType = Context.getPointerType(FromType); |
| ImpCastExprToType(From, FromType); |
| break; |
| |
| default: |
| assert(false && "Improper first standard conversion"); |
| break; |
| } |
| |
| // Perform the second implicit conversion |
| switch (SCS.Second) { |
| case ICK_Identity: |
| // Nothing to do. |
| break; |
| |
| case ICK_Integral_Promotion: |
| case ICK_Floating_Promotion: |
| case ICK_Integral_Conversion: |
| case ICK_Floating_Conversion: |
| case ICK_Floating_Integral: |
| FromType = ToType.getUnqualifiedType(); |
| ImpCastExprToType(From, FromType); |
| break; |
| |
| case ICK_Pointer_Conversion: |
| if (SCS.IncompatibleObjC) { |
| // Diagnose incompatible Objective-C conversions |
| Diag(From->getSourceRange().getBegin(), |
| diag::ext_typecheck_convert_incompatible_pointer) |
| << From->getType() << ToType << Flavor |
| << From->getSourceRange(); |
| } |
| |
| if (CheckPointerConversion(From, ToType)) |
| return true; |
| ImpCastExprToType(From, ToType); |
| break; |
| |
| case ICK_Pointer_Member: |
| // FIXME: Implement pointer-to-member conversions. |
| assert(false && "Pointer-to-member conversions are unsupported"); |
| break; |
| |
| case ICK_Boolean_Conversion: |
| FromType = Context.BoolTy; |
| ImpCastExprToType(From, FromType); |
| break; |
| |
| default: |
| assert(false && "Improper second standard conversion"); |
| break; |
| } |
| |
| switch (SCS.Third) { |
| case ICK_Identity: |
| // Nothing to do. |
| break; |
| |
| case ICK_Qualification: |
| ImpCastExprToType(From, ToType); |
| break; |
| |
| default: |
| assert(false && "Improper second standard conversion"); |
| break; |
| } |
| |
| return false; |
| } |
| |