SemaCXXCast.cpp File Reference

#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/Initialization.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "llvm/ADT/SmallVector.h"
#include <set>

Include dependency graph for SemaCXXCast.cpp:

Go to the source code of this file.

Enumerations
enum	TryCastResult { TC_NotApplicable, TC_Success, TC_Failed }
enum	CastType {   CT_Const, CT_Static, CT_Reinterpret, CT_Dynamic,   CT_CStyle, CT_Functional }
Functions
static bool	CastsAwayConstness (Sema &Self, QualType SrcType, QualType DestType, bool CheckCVR, bool CheckObjCLifetime)
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, const 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, const 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, const SourceRange &OpRange, QualType OrigSrcType, QualType OrigDestType, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
static TryCastResult	TryStaticMemberPointerUpcast (Sema &Self, ExprResult &SrcExpr, QualType SrcType, QualType DestType, bool CStyle, const SourceRange &OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
static TryCastResult	TryStaticImplicitCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, Sema::CheckedConversionKind CCK, const SourceRange &OpRange, unsigned &msg, CastKind &Kind)
static TryCastResult	TryStaticCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, Sema::CheckedConversionKind CCK, const SourceRange &OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
static TryCastResult	TryConstCast (Sema &Self, Expr *SrcExpr, QualType DestType, bool CStyle, unsigned &msg)
static TryCastResult	TryReinterpretCast (Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, const SourceRange &OpRange, unsigned &msg, CastKind &Kind)
static bool	tryDiagnoseOverloadedCast (Sema &S, CastType CT, SourceRange range, Expr *src, QualType destType)
static void	diagnoseBadCast (Sema &S, unsigned msg, CastType castType, SourceRange opRange, Expr *src, QualType destType)
	Diagnose a failed cast.
static bool	UnwrapDissimilarPointerTypes (QualType &T1, QualType &T2)

---

Enumeration Type Documentation

enum 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).

Definition at line 34 of file SemaCXXCast.cpp.

enum TryCastResult

Enumerator:

TC_NotApplicable	The cast method is not applicable.
TC_Success	The cast method is appropriate and successful.
TC_Failed	The cast method is appropriate, but failed. A diagnostic has been emitted.

Definition at line 27 of file SemaCXXCast.cpp.

---

Function Documentation

static bool CastsAwayConstness	(	Sema &	Self,
		QualType	SrcType,
		QualType	DestType,
		bool	CheckCVR,
		bool	CheckObjCLifetime
	)			[static]

CastsAwayConstness - Check if the pointer conversion from SrcType to DestType casts away constness as defined in C++ 5.2.11p8ff. 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 439 of file SemaCXXCast.cpp.

References clang::Qualifiers::compatiblyIncludesObjCLifetime(), clang::Sema::Context, clang::ASTContext::getCanonicalType(), clang::Qualifiers::getCVRQualifiers(), clang::ASTContext::getLangOptions(), clang::ASTContext::getPointerType(), clang::ASTContext::getQualifiedType(), clang::ASTContext::getUnqualifiedArrayType(), clang::Sema::IsQualificationConversion(), clang::Qualifiers::setCVRQualifiers(), UnwrapDissimilarPointerTypes(), and clang::ASTContext::VoidTy.

Referenced by TryReinterpretCast().

static void diagnoseBadCast	(	Sema &	S,
		unsigned	msg,
		CastType	castType,
		SourceRange	opRange,
		Expr *	src,
		QualType	destType
	)			[static]

Diagnose a failed cast.

Definition at line 359 of file SemaCXXCast.cpp.

References clang::ASTContext::BoundMemberTy, clang::Sema::CheckPlaceholderExpr(), clang::Sema::Context, clang::Sema::Diag(), clang::SourceRange::getBegin(), clang::Stmt::getSourceRange(), clang::Expr::getType(), and tryDiagnoseOverloadedCast().

static TryCastResult TryConstCast	(	Sema &	Self,
		Expr *	SrcExpr,
		QualType	DestType,
		bool	CStyle,
		unsigned &	msg
	)			[static]

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

Definition at line 1317 of file SemaCXXCast.cpp.

References clang::Sema::Context, clang::ASTContext::getCanonicalType(), clang::ASTContext::getPointerType(), clang::Expr::getType(), clang::ASTContext::getUnqualifiedArrayType(), clang::Expr::isLValue(), clang::Qualifiers::removeCVRQualifiers(), TC_NotApplicable, TC_Success, and clang::ASTContext::UnwrapSimilarPointerTypes().

static bool tryDiagnoseOverloadedCast	(	Sema &	S,
		CastType	CT,
		SourceRange	range,
		Expr *	src,
		QualType	destType
	)			[static]

Try to diagnose a failed overloaded cast. Returns true if diagnostics were emitted.

Definition at line 284 of file SemaCXXCast.cpp.

References clang::InitializationKind::CreateCast(), clang::InitializationKind::CreateCStyleCast(), clang::InitializationKind::CreateFunctionalCast(), CT_Const, CT_CStyle, CT_Dynamic, CT_Functional, CT_Reinterpret, CT_Static, clang::Sema::Diag(), clang::InitializationSequence::Failed(), clang::InitializationSequence::FK_ConstructorOverloadFailed, clang::InitializationSequence::FK_UserConversionOverloadFailed, clang::SourceRange::getBegin(), clang::InitializationSequence::getFailedCandidateSet(), clang::InitializationSequence::getFailedOverloadResult(), clang::InitializationSequence::getFailureKind(), clang::Stmt::getSourceRange(), clang::Expr::getType(), clang::InitializedEntity::InitializeTemporary(), clang::OverloadCandidateSet::NoteCandidates(), clang::OCD_AllCandidates, clang::OCD_ViableCandidates, clang::OR_Ambiguous, clang::OR_Deleted, clang::OR_No_Viable_Function, and clang::OR_Success.

Referenced by diagnoseBadCast().

TryCastResult TryLValueToRValueCast	(	Sema &	Self,
		Expr *	SrcExpr,
		QualType	DestType,
		bool	CStyle,
		CastKind &	Kind,
		CXXCastPath &	BasePath,
		unsigned &	msg
	)			[static]

Tests whether a conversion according to N2844 is valid.

Definition at line 921 of file SemaCXXCast.cpp.

References clang::Sema::BuildBasePathArray(), clang::CK_DerivedToBase, clang::CK_NoOp, clang::Sema::CompareReferenceRelationship(), clang::Stmt::getLocStart(), clang::ReferenceType::getPointeeType(), clang::Expr::getType(), clang::QualType::getUnqualifiedType(), clang::Sema::IsDerivedFrom(), clang::Expr::isGLValue(), TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticCast().

static TryCastResult TryReinterpretCast	(	Sema &	Self,
		ExprResult &	SrcExpr,
		QualType	DestType,
		bool	CStyle,
		const SourceRange &	OpRange,
		unsigned &	msg,
		CastKind &	Kind
	)			[static]

Definition at line 1445 of file SemaCXXCast.cpp.

References CastsAwayConstness(), clang::Sema::CheckCompatibleReinterpretCast(), clang::CK_AnyPointerToBlockPointerCast, clang::CK_BitCast, clang::CK_IntegralToPointer, clang::CK_LValueBitCast, clang::CK_NoOp, clang::CK_PointerToIntegral, clang::Sema::Context, clang::Sema::Diag(), clang::ExprError(), clang::ActionResult< PtrTy, CompressInvalid >::get(), clang::SourceRange::getBegin(), clang::ASTContext::getCanonicalType(), clang::Sema::getLangOptions(), clang::Expr::getObjectKind(), clang::MemberPointerType::getPointeeType(), clang::ASTContext::getPointerType(), clang::Stmt::getSourceRange(), clang::Expr::getType(), clang::ASTContext::getTypeSize(), clang::Expr::getValueKindForType(), clang::Expr::isLValue(), clang::ActionResult< PtrTy, CompressInvalid >::isUsable(), clang::move(), clang::OK_BitField, clang::OK_ObjCProperty, clang::OK_Ordinary, clang::OK_VectorComponent, clang::ASTContext::OverloadTy, clang::Sema::PrepareCastToObjCObjectPointer(), clang::Sema::ResolveAndFixSingleFunctionTemplateSpecialization(), TC_Failed, TC_NotApplicable, TC_Success, and clang::VK_RValue.

static TryCastResult TryStaticCast	(	Sema &	Self,
		ExprResult &	SrcExpr,
		QualType	DestType,
		Sema::CheckedConversionKind	CCK,
		const SourceRange &	OpRange,
		unsigned &	msg,
		CastKind &	Kind,
		CXXCastPath &	BasePath
	)			[static]

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 753 of file SemaCXXCast.cpp.

References clang::CK_AnyPointerToBlockPointerCast, clang::CK_BitCast, clang::CK_CPointerToObjCPointerCast, clang::CK_FloatingToIntegral, clang::CK_IntegralCast, clang::CK_IntegralToBoolean, clang::CK_IntegralToFloating, clang::Qualifiers::compatiblyIncludes(), clang::Sema::Context, clang::ActionResult< PtrTy, CompressInvalid >::get(), clang::ASTContext::getCanonicalType(), clang::PointerType::getPointeeType(), clang::QualType::getQualifiers(), clang::Expr::getType(), clang::ActionResult< PtrTy, CompressInvalid >::isInvalid(), clang::Qualifiers::removeObjCGCAttr(), clang::Qualifiers::removeObjCLifetime(), TC_Failed, TC_NotApplicable, TC_Success, TryLValueToRValueCast(), TryStaticImplicitCast(), TryStaticMemberPointerUpcast(), TryStaticPointerDowncast(), and TryStaticReferenceDowncast().

TryCastResult TryStaticDowncast	(	Sema &	Self,
		CanQualType	SrcType,
		CanQualType	DestType,
		bool	CStyle,
		const SourceRange &	OpRange,
		QualType	OrigSrcType,
		QualType	OrigDestType,
		unsigned &	msg,
		CastKind &	Kind,
		CXXCastPath &	BasePath
	)			[static]

TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and TryStaticPointerDowncast. Tests whether a static downcast from SrcType to DestType is possible and allowed.

Definition at line 1041 of file SemaCXXCast.cpp.

References AR_accessible, AR_dependent, AR_inaccessible, clang::CXXBasePaths::begin(), clang::Sema::BuildBasePathArray(), clang::Sema::CheckBaseClassAccess(), clang::CK_BaseToDerived, clang::CXXBasePaths::clear(), clang::Sema::Diag(), clang::CXXBasePaths::end(), clang::CXXBasePaths::front(), clang::CanQual< T >::getAs(), clang::SourceRange::getBegin(), clang::CXXBasePaths::getDetectedVirtual(), clang::CanQual< T >::getUnqualifiedType(), clang::CXXBasePaths::isAmbiguous(), clang::CanQual< T >::isAtLeastAsQualifiedAs(), clang::Sema::IsDerivedFrom(), clang::CXXBasePaths::isRecordingPaths(), clang::Sema::PDiag(), clang::Sema::RequireCompleteType(), clang::CXXBasePaths::setRecordingPaths(), TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticPointerDowncast(), and TryStaticReferenceDowncast().

TryCastResult TryStaticImplicitCast	(	Sema &	Self,
		ExprResult &	SrcExpr,
		QualType	DestType,
		Sema::CheckedConversionKind	CCK,
		const SourceRange &	OpRange,
		unsigned &	msg,
		CastKind &	Kind
	)			[static]

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 1267 of file SemaCXXCast.cpp.

References clang::CK_ConstructorConversion, clang::CK_NoOp, clang::InitializationSequence::Failed(), clang::ActionResult< PtrTy, CompressInvalid >::get(), clang::SourceRange::getBegin(), clang::InitializationSequence::isConstructorInitialization(), clang::ActionResult< PtrTy, CompressInvalid >::isInvalid(), clang::move(), clang::InitializationSequence::Perform(), clang::Sema::RequireCompleteType(), TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticCast().

TryCastResult TryStaticMemberPointerUpcast	(	Sema &	Self,
		ExprResult &	SrcExpr,
		QualType	SrcType,
		QualType	DestType,
		bool	CStyle,
		const SourceRange &	OpRange,
		unsigned &	msg,
		CastKind &	Kind,
		CXXCastPath &	BasePath
	)			[static]

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 1156 of file SemaCXXCast.cpp.

References AR_accessible, AR_dependent, AR_inaccessible, clang::Sema::BuildBasePathArray(), clang::Sema::CheckBaseClassAccess(), clang::CK_DerivedToBaseMemberPointer, clang::Sema::Context, clang::Sema::Diag(), clang::Sema::FixOverloadedFunctionReference(), clang::ActionResult< PtrTy, CompressInvalid >::get(), clang::Sema::getAmbiguousPathsDisplayString(), clang::SourceRange::getBegin(), clang::ASTContext::getCanonicalType(), clang::MemberPointerType::getClass(), clang::ASTContext::getMemberPointerType(), clang::CXXMethodDecl::getParent(), clang::MemberPointerType::getPointeeType(), clang::Expr::getType(), clang::ASTContext::getTypeDeclType(), clang::ASTContext::hasSameUnqualifiedType(), clang::Sema::IsDerivedFrom(), clang::ActionResult< PtrTy, CompressInvalid >::isUsable(), clang::ASTContext::OverloadTy, clang::Sema::ResolveAddressOfOverloadedFunction(), TC_Failed, TC_NotApplicable, and TC_Success.

Referenced by TryStaticCast().

TryCastResult TryStaticPointerDowncast	(	Sema &	Self,
		QualType	SrcType,
		QualType	DestType,
		bool	CStyle,
		const SourceRange &	OpRange,
		unsigned &	msg,
		CastKind &	Kind,
		CXXCastPath &	BasePath
	)			[static]

Tests whether a conversion according to C++ 5.2.9p8 is valid.

Definition at line 1007 of file SemaCXXCast.cpp.

References clang::Sema::Context, clang::ASTContext::getCanonicalType(), clang::PointerType::getPointeeType(), TC_NotApplicable, and TryStaticDowncast().

Referenced by TryStaticCast().

TryCastResult TryStaticReferenceDowncast	(	Sema &	Self,
		Expr *	SrcExpr,
		QualType	DestType,
		bool	CStyle,
		const SourceRange &	OpRange,
		unsigned &	msg,
		CastKind &	Kind,
		CXXCastPath &	BasePath
	)			[static]

Tests whether a conversion according to C++ 5.2.9p5 is valid.

Definition at line 972 of file SemaCXXCast.cpp.

References clang::Sema::Context, clang::ASTContext::getCanonicalType(), clang::ReferenceType::getPointeeType(), clang::Expr::getType(), clang::Expr::isLValue(), clang::Type::isRValueReferenceType(), TC_NotApplicable, and TryStaticDowncast().

Referenced by TryStaticCast().

static bool UnwrapDissimilarPointerTypes	(	QualType &	T1,
		QualType &	T2
	)			[static]

UnwrapDissimilarPointerTypes - Like Sema::UnwrapSimilarPointerTypes, this removes one level of indirection from both types, provided that they're the same kind of pointer (plain or to-member). Unlike the Sema function, this one doesn't care if the two pointers-to-member don't point into the same class. This is because CastsAwayConstness doesn't care.

Definition at line 379 of file SemaCXXCast.cpp.

References clang::BlockPointerType::getPointeeType(), clang::MemberPointerType::getPointeeType(), clang::ObjCObjectPointerType::getPointeeType(), and clang::PointerType::getPointeeType().

Referenced by CastsAwayConstness().