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clang: lib/Sema/SemaCast.cpp File Reference

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static bool  isValidCast (TryCastResult TCR)   static void  DiagnoseCastQual (Sema &Self, const ExprResult &SrcExpr, QualType DestType)   DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either const, volatile or both.
  static TryCastResult  TryLValueToRValueCast (Sema &Self, Expr *SrcExpr, QualType DestType, bool CStyle, CastKind &Kind, CXXCastPath &BasePath, unsigned &msg)   Tests whether a conversion according to N2844 is valid.
  static TryCastResult  TryStaticReferenceDowncast (Sema &Self, Expr *SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)   Tests whether a conversion according to C++ 5.2.9p5 is valid.
  static TryCastResult  TryStaticPointerDowncast (Sema &Self, QualType SrcType, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)   Tests whether a conversion according to C++ 5.2.9p8 is valid.
  static TryCastResult  TryStaticDowncast (Sema &Self, CanQualType SrcType, CanQualType DestType, bool CStyle, SourceRange OpRange, QualType OrigSrcType, QualType OrigDestType, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)   TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and TryStaticPointerDowncast.
  static TryCastResult  TryStaticMemberPointerUpcast (Sema &Self, ExprResult &SrcExpr, QualType SrcType, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)   TryStaticMemberPointerUpcast - Tests whether a conversion according to C++ 5.2.9p9 is valid:
  static TryCastResult  TryStaticImplicitCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, CheckedConversionKind CCK, SourceRange OpRange, unsigned &msg, CastKind &Kind, bool ListInitialization)   TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2 is valid:
  static TryCastResult  TryStaticCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, CheckedConversionKind CCK, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath, bool ListInitialization)   TryStaticCast - Check if a static cast can be performed, and do so if possible.
  static TryCastResult  TryConstCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, unsigned &msg)   TryConstCast - See if a const_cast from source to destination is allowed, and perform it if it is.
  static TryCastResult  TryReinterpretCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind)   static TryCastResult  TryAddressSpaceCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, unsigned &msg, CastKind &Kind)   static bool  tryDiagnoseOverloadedCast (Sema &S, CastType CT, SourceRange range, Expr *src, QualType destType, bool listInitialization)   Try to diagnose a failed overloaded cast.
  static void  diagnoseBadCast (Sema &S, unsigned msg, CastType castType, SourceRange opRange, Expr *src, QualType destType, bool listInitialization)   Diagnose a failed cast.
  static CastAwayConstnessKind  unwrapCastAwayConstnessLevel (ASTContext &Context, QualType &T1, QualType &T2)   Unwrap one level of types for CastsAwayConstness.
  static CastAwayConstnessKind  CastsAwayConstness (Sema &Self, QualType SrcType, QualType DestType, bool CheckCVR, bool CheckObjCLifetime, QualType *TheOffendingSrcType=nullptr, QualType *TheOffendingDestType=nullptr, Qualifiers *CastAwayQualifiers=nullptr)   Check if the pointer conversion from SrcType to DestType casts away constness as defined in C++ [expr.const.cast].
  static TryCastResult  getCastAwayConstnessCastKind (CastAwayConstnessKind CACK, unsigned &DiagID)   static void  DiagnoseReinterpretUpDownCast (Sema &Self, const Expr *SrcExpr, QualType DestType, SourceRange OpRange)   Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast or downcast between respective pointers or references.
  static bool  argTypeIsABIEquivalent (QualType SrcType, QualType DestType, ASTContext &Context)   static unsigned int  checkCastFunctionType (Sema &Self, const ExprResult &SrcExpr, QualType DestType)   static bool  IsAddressSpaceConversion (QualType SrcType, QualType DestType)   static void  DiagnoseCastOfObjCSEL (Sema &Self, const ExprResult &SrcExpr, QualType DestType)   static void  DiagnoseCallingConvCast (Sema &Self, const ExprResult &SrcExpr, QualType DstType, SourceRange OpRange)   Diagnose casts that change the calling convention of a pointer to a function defined in the current TU.
  static void  checkIntToPointerCast (bool CStyle, const SourceRange &OpRange, const Expr *SrcExpr, QualType DestType, Sema &Self)   static bool  fixOverloadedReinterpretCastExpr (Sema &Self, QualType DestType, ExprResult &Result)   static void  DiagnoseBadFunctionCast (Sema &Self, const ExprResult &SrcExpr, QualType DestType)   DiagnoseBadFunctionCast - Warn whenever a function call is cast to a non-matching type.
  ◆ CastType Enumerator CT_Const 

const_cast

CT_Static 

static_cast

CT_Reinterpret 

reinterpret_cast

CT_Dynamic 

dynamic_cast

CT_CStyle 

(Type)expr

CT_Functional 

Type(expr)

CT_Addrspace 

addrspace_cast

Definition at line 48 of file SemaCast.cpp.

◆ TryCastResult Enumerator TC_NotApplicable 

The cast method is not applicable.

TC_Success 

The cast method is appropriate and successful.

TC_Extension 

The cast method is appropriate and accepted as a language extension.

TC_Failed 

The cast method is appropriate, but failed.

A diagnostic has been emitted.

Definition at line 35 of file SemaCast.cpp.

◆ argTypeIsABIEquivalent() ◆ CastsAwayConstness()

Check if the pointer conversion from SrcType to DestType casts away constness as defined in C++ [expr.const.cast].

This is used by the cast checkers. Both arguments must denote pointer (possibly to member) types.

Parameters
CheckCVR Whether to check for const/volatile/restrict qualifiers. CheckObjCLifetime Whether to check Objective-C lifetime qualifiers.

Definition at line 674 of file SemaCast.cpp.

References clang::Qualifiers::compatiblyIncludesObjCLifetime(), clang::Qualifiers::fromCVRMask(), clang::Qualifiers::getCVRQualifiers(), clang::Qualifiers::hasConst(), clang::Type::isAnyPointerType(), clang::Type::isBlockPointerType(), clang::Type::isMemberPointerType(), clang::Type::isObjCObjectType(), clang::Type::isReferenceType(), clang::Qualifiers::removeConst(), clang::Self, and unwrapCastAwayConstnessLevel().

Referenced by DiagnoseCastQual(), and TryReinterpretCast().

◆ checkCastFunctionType()

Definition at line 1108 of file SemaCast.cpp.

References argTypeIsABIEquivalent(), clang::Type::castAs(), clang::ActionResult< PtrTy, Compress >::get(), clang::Type::getAs(), clang::Expr::getExprLoc(), clang::QualType::getNonReferenceType(), clang::Type::getPointeeType(), clang::FunctionType::getReturnType(), clang::Expr::getType(), clang::Type::isBlockPointerType(), clang::Type::isFunctionNoProtoType(), clang::Type::isFunctionPointerType(), clang::Type::isFunctionReferenceType(), clang::Type::isFunctionType(), clang::Type::isMemberFunctionPointerType(), clang::Type::isVoidType(), clang::Self, and clang::T.

◆ checkIntToPointerCast() ◆ diagnoseBadCast() ◆ DiagnoseBadFunctionCast()

DiagnoseBadFunctionCast - Warn whenever a function call is cast to a non-matching type.

Such as enum function call to int, int call to pointer; etc. Cast to 'void' is an exception.

Definition at line 2897 of file SemaCast.cpp.

References clang::ActionResult< PtrTy, Compress >::get(), clang::Expr::getExprLoc(), clang::Stmt::getSourceRange(), clang::Expr::getType(), clang::QualType::getUnqualifiedType(), clang::Type::isAnyPointerType(), clang::Type::isBlockPointerType(), clang::Type::isBooleanType(), clang::Type::isComplexIntegerType(), clang::Type::isComplexType(), clang::Type::isEnumeralType(), clang::Type::isFixedPointType(), clang::Type::isIntegerType(), clang::Type::isRealFloatingType(), clang::Type::isVoidType(), and clang::Self.

◆ DiagnoseCallingConvCast()

Diagnose casts that change the calling convention of a pointer to a function defined in the current TU.

Definition at line 2123 of file SemaCast.cpp.

References clang::Type::castAs(), clang::FixItHint::CreateInsertion(), clang::ActionResult< PtrTy, Compress >::get(), clang::SourceRange::getBegin(), clang::FunctionType::getCallConv(), clang::Preprocessor::getIdentifierInfo(), clang::Preprocessor::getLastMacroWithSpelling(), clang::FunctionType::getNameForCallConv(), getPointeeType(), clang::IdentifierInfo::getTokenID(), clang::Expr::getType(), clang::Expr::IgnoreParenImpCasts(), clang::Type::isFunctionPointerType(), clang::IdentifierInfo::isKeyword(), and clang::Self.

Referenced by TryReinterpretCast().

◆ DiagnoseCastOfObjCSEL() ◆ DiagnoseCastQual()

DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either const, volatile or both.

Definition at line 3319 of file SemaCast.cpp.

References CastsAwayConstness(), clang::ActionResult< PtrTy, Compress >::get(), clang::Stmt::getBeginLoc(), clang::Expr::getType(), clang::Qualifiers::hasConst(), clang::Qualifiers::hasVolatile(), clang::Type::isAnyPointerType(), clang::ActionResult< PtrTy, Compress >::isInvalid(), clang::Type::isLValueReferenceType(), and clang::Self.

Referenced by clang::Sema::BuildCStyleCastExpr(), and clang::Sema::BuildCXXFunctionalCastExpr().

◆ DiagnoseReinterpretUpDownCast()

Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast or downcast between respective pointers or references.

Definition at line 1002 of file SemaCast.cpp.

References clang::CXXBasePaths::begin(), clang::Class, clang::FixItHint::CreateReplacement(), E, clang::CXXBasePaths::end(), clang::Type::getAsCXXRecordDecl(), clang::ASTRecordLayout::getBaseClassOffset(), clang::SourceRange::getBegin(), clang::Type::getPointeeCXXRecordDecl(), clang::Expr::getType(), int, clang::TagDecl::isCompleteDefinition(), clang::CXXRecordDecl::isDerivedFrom(), clang::Decl::isInvalidDecl(), Path, clang::Self, clang::VirtualBase, and clang::CharUnits::Zero().

◆ fixOverloadedReinterpretCastExpr() ◆ getCastAwayConstnessCastKind() ◆ IsAddressSpaceConversion() ◆ isValidCast() ◆ TryAddressSpaceCast() ◆ TryConstCast()

TryConstCast - See if a const_cast from source to destination is allowed, and perform it if it is.

Definition at line 1947 of file SemaCast.cpp.

References clang::ActionResult< PtrTy, Compress >::get(), clang::Type::getAs(), clang::Expr::getType(), clang::Type::isFunctionPointerType(), clang::Expr::isLValue(), clang::Type::isMemberFunctionPointerType(), clang::Type::isMemberPointerType(), clang::Type::isObjCObjectPointerType(), clang::Type::isPointerType(), clang::Expr::isPRValue(), clang::Type::isRecordType(), clang::Expr::refersToBitField(), clang::Self, TC_NotApplicable, and TC_Success.

◆ tryDiagnoseOverloadedCast()

Try to diagnose a failed overloaded cast.

Returns true if diagnostics were emitted.

Definition at line 416 of file SemaCast.cpp.

References clang::OverloadCandidateSet::BestViableFunction(), clang::InitializationKind::CreateCast(), clang::InitializationKind::CreateCStyleCast(), clang::InitializationKind::CreateFunctionalCast(), CT_Addrspace, CT_Const, CT_CStyle, CT_Dynamic, CT_Functional, CT_Reinterpret, CT_Static, clang::OverloadCandidateSet::empty(), clang::InitializationSequence::Failed(), clang::InitializationSequence::FK_ConstructorOverloadFailed, clang::InitializationSequence::FK_ParenthesizedListInitFailed, clang::InitializationSequence::FK_UserConversionOverloadFailed, clang::InitializationSequence::getFailedCandidateSet(), clang::InitializationSequence::getFailedOverloadResult(), clang::InitializationSequence::getFailureKind(), clang::Stmt::getSourceRange(), clang::StringLiteral::getString(), clang::Expr::getType(), clang::InitializedEntity::InitializeTemporary(), clang::Type::isArrayType(), clang::Type::isRecordType(), clang::OverloadCandidateSet::NoteCandidates(), clang::OCD_AllCandidates, clang::OCD_AmbiguousCandidates, clang::OCD_ViableCandidates, clang::OR_Ambiguous, clang::OR_Deleted, clang::OR_No_Viable_Function, clang::OR_Success, and clang::SemaBase::PDiag().

Referenced by diagnoseBadCast().

◆ TryLValueToRValueCast()

Tests whether a conversion according to N2844 is valid.

Definition at line 1533 of file SemaCast.cpp.

References clang::Type::getAs(), clang::Stmt::getBeginLoc(), clang::ReferenceType::getPointeeType(), clang::Expr::getType(), clang::QualType::getUnqualifiedType(), clang::Expr::isGLValue(), clang::Expr::isLValue(), clang::Sema::Ref_Compatible, clang::Sema::Ref_Incompatible, clang::Self, TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticCast().

◆ TryReinterpretCast()

Definition at line 2265 of file SemaCast.cpp.

References CastsAwayConstness(), checkIntToPointerCast(), Diag(), DiagnoseCallingConvCast(), DiagnoseCastOfObjCSEL(), clang::ExprError(), fixOverloadedReinterpretCastExpr(), clang::ActionResult< PtrTy, Compress >::get(), clang::QualType::getAddressSpace(), clang::Type::getAs(), clang::SourceRange::getBegin(), getCastAwayConstnessCastKind(), clang::Expr::getObjectKind(), clang::Type::getPointeeType(), clang::QualType::getQualifiers(), clang::Stmt::getSourceRange(), clang::Expr::getType(), IsAddressSpaceConversion(), clang::Qualifiers::isAddressSpaceSupersetOf(), clang::Type::isAnyPointerType(), clang::Type::isBlockPointerType(), clang::Type::isBooleanType(), clang::Type::isExtVectorType(), clang::Type::isFunctionPointerType(), clang::Expr::isGLValue(), clang::Type::isIntegralOrEnumerationType(), clang::Type::isIntegralType(), clang::MemberPointerType::isMemberFunctionPointer(), clang::Type::isMemberPointerType(), clang::QualType::isNull(), clang::Type::isNullPtrType(), clang::Type::isObjCObjectPointerType(), clang::Type::isPointerType(), clang::ActionResult< PtrTy, Compress >::isUsable(), clang::Type::isVectorType(), clang::Type::isVoidPointerType(), clang::OK_BitField, clang::OK_MatrixComponent, clang::OK_ObjCProperty, clang::OK_ObjCSubscript, clang::OK_Ordinary, clang::OK_VectorComponent, clang::Result, clang::Self, TC_Failed, TC_NotApplicable, and TC_Success.

◆ TryStaticCast()

TryStaticCast - Check if a static cast can be performed, and do so if possible.

If CStyle, ignore access restrictions on hierarchy casting and casting away constness.

Definition at line 1321 of file SemaCast.cpp.

References clang::Type::castAs(), clang::Qualifiers::compatiblyIncludes(), clang::CStyleCast, clang::Enum, clang::ExprError(), clang::FunctionalCast, clang::ActionResult< PtrTy, Compress >::get(), clang::Type::getAs(), clang::SourceRange::getBegin(), clang::Type::getPointeeType(), clang::PointerType::getPointeeType(), clang::QualType::getQualifiers(), clang::Expr::getType(), IsAddressSpaceConversion(), clang::Type::isBlockPointerType(), clang::Type::isBooleanType(), clang::Type::isEnumeralType(), clang::Type::isFunctionType(), clang::Type::isIncompleteOrObjectType(), clang::Type::isIntegralOrEnumerationType(), clang::Type::isIntegralType(), clang::ActionResult< PtrTy, Compress >::isInvalid(), clang::Type::isMatrixType(), clang::Type::isObjCObjectPointerType(), clang::Type::isRealFloatingType(), clang::Type::isVoidType(), clang::Qualifiers::removeObjCGCAttr(), clang::Qualifiers::removeObjCLifetime(), clang::Self, TC_Failed, TC_NotApplicable, TC_Success, TryLValueToRValueCast(), TryStaticImplicitCast(), TryStaticMemberPointerUpcast(), TryStaticPointerDowncast(), and TryStaticReferenceDowncast().

◆ TryStaticDowncast()

TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and TryStaticPointerDowncast.

Tests whether a static downcast from SrcType to DestType is possible and allowed.

Definition at line 1660 of file SemaCast.cpp.

References clang::Sema::AR_accessible, clang::Sema::AR_delayed, clang::Sema::AR_dependent, clang::Sema::AR_inaccessible, clang::CanQual< T >::getAs(), clang::QualType::getAsString(), clang::SourceRange::getBegin(), clang::CanQual< T >::getUnqualifiedType(), clang::QualType::getUnqualifiedType(), clang::CanQual< T >::isAtLeastAsQualifiedAs(), Path, clang::Self, TC_Failed, TC_NotApplicable, TC_Success, and clang::VirtualBase.

Referenced by TryStaticPointerDowncast(), and TryStaticReferenceDowncast().

◆ TryStaticImplicitCast()

TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2 is valid:

An expression e can be explicitly converted to a type T using a static_cast if the declaration "T t(e);" is well-formed [...].

Definition at line 1890 of file SemaCast.cpp.

References clang::InitializationKind::CreateCast(), clang::InitializationKind::CreateCStyleCast(), clang::InitializationKind::CreateFunctionalCast(), clang::CStyleCast, clang::InitializationSequence::Failed(), clang::FunctionalCast, clang::ActionResult< PtrTy, Compress >::get(), clang::SourceRange::getBegin(), clang::InitializedEntity::InitializeTemporary(), clang::InitializationSequence::isConstructorInitialization(), clang::Type::isRecordType(), clang::Type::isReferenceType(), clang::InitializationSequence::Perform(), clang::Result, clang::Self, TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticCast().

◆ TryStaticMemberPointerUpcast()

TryStaticMemberPointerUpcast - Tests whether a conversion according to C++ 5.2.9p9 is valid:

An rvalue of type "pointer to member of D of type cv1 T" can be converted to an rvalue of type "pointer to member of B of type cv2 T", where B is a base class of D [...].

Definition at line 1773 of file SemaCast.cpp.

References clang::Sema::AR_accessible, clang::Sema::AR_delayed, clang::Sema::AR_dependent, clang::Sema::AR_inaccessible, clang::ActionResult< PtrTy, Compress >::get(), clang::Type::getAs(), clang::SourceRange::getBegin(), clang::MemberPointerType::getClass(), clang::CXXMethodDecl::getParent(), clang::MemberPointerType::getPointeeType(), clang::Expr::getType(), clang::ActionResult< PtrTy, Compress >::isUsable(), clang::Self, TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticCast().

◆ TryStaticPointerDowncast() ◆ TryStaticReferenceDowncast() ◆ unwrapCastAwayConstnessLevel()

Unwrap one level of types for CastsAwayConstness.

Like Sema::UnwrapSimilarTypes, this removes one level of indirection from both types, provided that they're both pointer-like or array-like. Unlike the Sema function, doesn't care if the unwrapped pieces are related.

This function may remove additional levels as necessary for correctness: the resulting T1 is unwrapped sufficiently that it is never an array type, so that its qualifiers can be directly compared to those of T2 (which will have the combined set of qualifiers from all indermediate levels of T2), as (effectively) required by [expr.const.cast]p7 replacing T1's qualifiers with those from T2.

Definition at line 596 of file SemaCast.cpp.

References clang::ASTContext::getAsArrayType(), clang::QualType::getCVRQualifiers(), clang::Type::getPointeeType(), clang::Type::isAnyPointerType(), clang::Type::isBlockPointerType(), clang::Type::isConstantArrayType(), clang::Type::isIncompleteArrayType(), clang::Type::isMemberPointerType(), clang::Type::isReferenceType(), clang::None, clang::T, clang::ASTContext::UnwrapSimilarArrayTypes(), clang::ASTContext::UnwrapSimilarTypes(), and clang::QualType::withCVRQualifiers().

Referenced by CastsAwayConstness().

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