зеркало из https://github.com/microsoft/clang-1.git
1558 строки
61 KiB
C++
1558 строки
61 KiB
C++
//===--- SemaNamedCast.cpp - Semantic Analysis for Named Casts ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements semantic analysis for C++ named casts.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/SemaInternal.h"
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#include "clang/Sema/Initialization.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/CXXInheritance.h"
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#include "clang/Basic/PartialDiagnostic.h"
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#include "llvm/ADT/SmallVector.h"
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#include <set>
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using namespace clang;
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static void NoteAllOverloadCandidates(Expr* const Expr, Sema& sema);
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enum TryCastResult {
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TC_NotApplicable, ///< The cast method is not applicable.
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TC_Success, ///< The cast method is appropriate and successful.
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TC_Failed ///< The cast method is appropriate, but failed. A
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///< diagnostic has been emitted.
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};
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enum CastType {
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CT_Const, ///< const_cast
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CT_Static, ///< static_cast
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CT_Reinterpret, ///< reinterpret_cast
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CT_Dynamic, ///< dynamic_cast
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CT_CStyle, ///< (Type)expr
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CT_Functional ///< Type(expr)
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};
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static void CheckConstCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
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ExprValueKind &VK,
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const SourceRange &OpRange,
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const SourceRange &DestRange);
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static void CheckReinterpretCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
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ExprValueKind &VK,
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const SourceRange &OpRange,
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const SourceRange &DestRange,
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CastKind &Kind);
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static void CheckStaticCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
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ExprValueKind &VK,
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const SourceRange &OpRange,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static void CheckDynamicCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
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ExprValueKind &VK,
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const SourceRange &OpRange,
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const SourceRange &DestRange,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static bool CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType);
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// The Try functions attempt a specific way of casting. If they succeed, they
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// return TC_Success. If their way of casting is not appropriate for the given
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// arguments, they return TC_NotApplicable and *may* set diag to a diagnostic
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// to emit if no other way succeeds. If their way of casting is appropriate but
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// fails, they return TC_Failed and *must* set diag; they can set it to 0 if
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// they emit a specialized diagnostic.
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// All diagnostics returned by these functions must expect the same three
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// arguments:
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// %0: Cast Type (a value from the CastType enumeration)
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// %1: Source Type
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// %2: Destination Type
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static TryCastResult TryLValueToRValueCast(Sema &Self, Expr *SrcExpr,
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QualType DestType, bool CStyle,
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CastKind &Kind,
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CXXCastPath &BasePath,
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unsigned &msg);
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static TryCastResult TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr,
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QualType DestType, bool CStyle,
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const SourceRange &OpRange,
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unsigned &msg,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static TryCastResult TryStaticPointerDowncast(Sema &Self, QualType SrcType,
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QualType DestType, bool CStyle,
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const SourceRange &OpRange,
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unsigned &msg,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static TryCastResult TryStaticDowncast(Sema &Self, CanQualType SrcType,
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CanQualType DestType, bool CStyle,
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const SourceRange &OpRange,
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QualType OrigSrcType,
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QualType OrigDestType, unsigned &msg,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static TryCastResult TryStaticMemberPointerUpcast(Sema &Self, Expr *&SrcExpr,
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QualType SrcType,
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QualType DestType,bool CStyle,
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const SourceRange &OpRange,
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unsigned &msg,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static TryCastResult TryStaticImplicitCast(Sema &Self, Expr *&SrcExpr,
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QualType DestType, bool CStyle,
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const SourceRange &OpRange,
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unsigned &msg,
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CastKind &Kind);
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static TryCastResult TryStaticCast(Sema &Self, Expr *&SrcExpr,
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QualType DestType, bool CStyle,
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const SourceRange &OpRange,
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unsigned &msg,
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CastKind &Kind,
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CXXCastPath &BasePath);
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static TryCastResult TryConstCast(Sema &Self, Expr *SrcExpr, QualType DestType,
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bool CStyle, unsigned &msg);
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static TryCastResult TryReinterpretCast(Sema &Self, Expr *SrcExpr,
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QualType DestType, bool CStyle,
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const SourceRange &OpRange,
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unsigned &msg,
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CastKind &Kind);
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/// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
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ExprResult
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Sema::ActOnCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
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SourceLocation LAngleBracketLoc, ParsedType Ty,
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SourceLocation RAngleBracketLoc,
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SourceLocation LParenLoc, Expr *E,
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SourceLocation RParenLoc) {
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TypeSourceInfo *DestTInfo;
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QualType DestType = GetTypeFromParser(Ty, &DestTInfo);
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if (!DestTInfo)
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DestTInfo = Context.getTrivialTypeSourceInfo(DestType, SourceLocation());
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return BuildCXXNamedCast(OpLoc, Kind, DestTInfo, move(E),
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SourceRange(LAngleBracketLoc, RAngleBracketLoc),
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SourceRange(LParenLoc, RParenLoc));
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}
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ExprResult
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Sema::BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
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TypeSourceInfo *DestTInfo, Expr *Ex,
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SourceRange AngleBrackets, SourceRange Parens) {
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QualType DestType = DestTInfo->getType();
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SourceRange OpRange(OpLoc, Parens.getEnd());
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SourceRange DestRange = AngleBrackets;
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// If the type is dependent, we won't do the semantic analysis now.
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// FIXME: should we check this in a more fine-grained manner?
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bool TypeDependent = DestType->isDependentType() || Ex->isTypeDependent();
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if (Ex->isBoundMemberFunction(Context))
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Diag(Ex->getLocStart(), diag::err_invalid_use_of_bound_member_func)
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<< Ex->getSourceRange();
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ExprValueKind VK = VK_RValue;
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if (TypeDependent)
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VK = Expr::getValueKindForType(DestType);
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switch (Kind) {
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default: llvm_unreachable("Unknown C++ cast!");
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case tok::kw_const_cast:
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if (!TypeDependent)
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CheckConstCast(*this, Ex, DestType, VK, OpRange, DestRange);
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return Owned(CXXConstCastExpr::Create(Context,
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DestType.getNonLValueExprType(Context),
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VK, Ex, DestTInfo, OpLoc,
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Parens.getEnd()));
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case tok::kw_dynamic_cast: {
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CastKind Kind = CK_Dependent;
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CXXCastPath BasePath;
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if (!TypeDependent)
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CheckDynamicCast(*this, Ex, DestType, VK, OpRange, DestRange,
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Kind, BasePath);
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return Owned(CXXDynamicCastExpr::Create(Context,
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DestType.getNonLValueExprType(Context),
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VK, Kind, Ex, &BasePath, DestTInfo,
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OpLoc, Parens.getEnd()));
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}
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case tok::kw_reinterpret_cast: {
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CastKind Kind = CK_Dependent;
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if (!TypeDependent)
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CheckReinterpretCast(*this, Ex, DestType, VK, OpRange, DestRange, Kind);
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return Owned(CXXReinterpretCastExpr::Create(Context,
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DestType.getNonLValueExprType(Context),
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VK, Kind, Ex, 0,
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DestTInfo, OpLoc, Parens.getEnd()));
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}
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case tok::kw_static_cast: {
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CastKind Kind = CK_Dependent;
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CXXCastPath BasePath;
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if (!TypeDependent)
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CheckStaticCast(*this, Ex, DestType, VK, OpRange, Kind, BasePath);
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return Owned(CXXStaticCastExpr::Create(Context,
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DestType.getNonLValueExprType(Context),
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VK, Kind, Ex, &BasePath,
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DestTInfo, OpLoc, Parens.getEnd()));
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}
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}
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return ExprError();
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}
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/// Try to diagnose a failed overloaded cast. Returns true if
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/// diagnostics were emitted.
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static bool tryDiagnoseOverloadedCast(Sema &S, CastType CT,
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SourceRange range, Expr *src,
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QualType destType) {
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switch (CT) {
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// These cast kinds don't consider user-defined conversions.
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case CT_Const:
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case CT_Reinterpret:
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case CT_Dynamic:
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return false;
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// These do.
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case CT_Static:
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case CT_CStyle:
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case CT_Functional:
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break;
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}
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QualType srcType = src->getType();
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if (!destType->isRecordType() && !srcType->isRecordType())
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return false;
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InitializedEntity entity = InitializedEntity::InitializeTemporary(destType);
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InitializationKind initKind
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= InitializationKind::CreateCast(/*type range?*/ range,
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(CT == CT_CStyle || CT == CT_Functional));
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InitializationSequence sequence(S, entity, initKind, &src, 1);
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assert(sequence.getKind() == InitializationSequence::FailedSequence &&
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"initialization succeeded on second try?");
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switch (sequence.getFailureKind()) {
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default: return false;
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case InitializationSequence::FK_ConstructorOverloadFailed:
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case InitializationSequence::FK_UserConversionOverloadFailed:
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break;
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}
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OverloadCandidateSet &candidates = sequence.getFailedCandidateSet();
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unsigned msg = 0;
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OverloadCandidateDisplayKind howManyCandidates = OCD_AllCandidates;
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switch (sequence.getFailedOverloadResult()) {
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case OR_Success: llvm_unreachable("successful failed overload");
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return false;
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case OR_No_Viable_Function:
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if (candidates.empty())
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msg = diag::err_ovl_no_conversion_in_cast;
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else
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msg = diag::err_ovl_no_viable_conversion_in_cast;
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howManyCandidates = OCD_AllCandidates;
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break;
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case OR_Ambiguous:
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msg = diag::err_ovl_ambiguous_conversion_in_cast;
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howManyCandidates = OCD_ViableCandidates;
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break;
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case OR_Deleted:
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msg = diag::err_ovl_deleted_conversion_in_cast;
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howManyCandidates = OCD_ViableCandidates;
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break;
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}
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S.Diag(range.getBegin(), msg)
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<< CT << srcType << destType
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<< range << src->getSourceRange();
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candidates.NoteCandidates(S, howManyCandidates, &src, 1);
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return true;
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}
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/// Diagnose a failed cast.
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static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType,
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SourceRange opRange, Expr *src, QualType destType) {
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if (msg == diag::err_bad_cxx_cast_generic &&
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tryDiagnoseOverloadedCast(S, castType, opRange, src, destType))
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return;
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S.Diag(opRange.getBegin(), msg) << castType
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<< src->getType() << destType << opRange << src->getSourceRange();
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}
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/// UnwrapDissimilarPointerTypes - Like Sema::UnwrapSimilarPointerTypes,
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/// this removes one level of indirection from both types, provided that they're
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/// the same kind of pointer (plain or to-member). Unlike the Sema function,
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/// this one doesn't care if the two pointers-to-member don't point into the
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/// same class. This is because CastsAwayConstness doesn't care.
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static bool UnwrapDissimilarPointerTypes(QualType& T1, QualType& T2) {
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const PointerType *T1PtrType = T1->getAs<PointerType>(),
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*T2PtrType = T2->getAs<PointerType>();
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if (T1PtrType && T2PtrType) {
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T1 = T1PtrType->getPointeeType();
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T2 = T2PtrType->getPointeeType();
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return true;
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}
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const ObjCObjectPointerType *T1ObjCPtrType =
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T1->getAs<ObjCObjectPointerType>(),
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*T2ObjCPtrType =
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T2->getAs<ObjCObjectPointerType>();
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if (T1ObjCPtrType) {
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if (T2ObjCPtrType) {
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T1 = T1ObjCPtrType->getPointeeType();
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T2 = T2ObjCPtrType->getPointeeType();
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return true;
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}
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else if (T2PtrType) {
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T1 = T1ObjCPtrType->getPointeeType();
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T2 = T2PtrType->getPointeeType();
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return true;
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}
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}
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else if (T2ObjCPtrType) {
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if (T1PtrType) {
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T2 = T2ObjCPtrType->getPointeeType();
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T1 = T1PtrType->getPointeeType();
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return true;
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}
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}
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const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(),
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*T2MPType = T2->getAs<MemberPointerType>();
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if (T1MPType && T2MPType) {
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T1 = T1MPType->getPointeeType();
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T2 = T2MPType->getPointeeType();
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return true;
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}
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const BlockPointerType *T1BPType = T1->getAs<BlockPointerType>(),
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*T2BPType = T2->getAs<BlockPointerType>();
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if (T1BPType && T2BPType) {
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T1 = T1BPType->getPointeeType();
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T2 = T2BPType->getPointeeType();
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return true;
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}
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return false;
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}
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/// CastsAwayConstness - Check if the pointer conversion from SrcType to
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/// DestType casts away constness as defined in C++ 5.2.11p8ff. This is used by
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/// the cast checkers. Both arguments must denote pointer (possibly to member)
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/// types.
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static bool
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CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType) {
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// Casting away constness is defined in C++ 5.2.11p8 with reference to
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// C++ 4.4. We piggyback on Sema::IsQualificationConversion for this, since
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// the rules are non-trivial. So first we construct Tcv *...cv* as described
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// in C++ 5.2.11p8.
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assert((SrcType->isAnyPointerType() || SrcType->isMemberPointerType() ||
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SrcType->isBlockPointerType()) &&
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"Source type is not pointer or pointer to member.");
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assert((DestType->isAnyPointerType() || DestType->isMemberPointerType() ||
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DestType->isBlockPointerType()) &&
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"Destination type is not pointer or pointer to member.");
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QualType UnwrappedSrcType = Self.Context.getCanonicalType(SrcType),
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UnwrappedDestType = Self.Context.getCanonicalType(DestType);
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llvm::SmallVector<Qualifiers, 8> cv1, cv2;
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// Find the qualifications.
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while (UnwrapDissimilarPointerTypes(UnwrappedSrcType, UnwrappedDestType)) {
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Qualifiers SrcQuals;
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Self.Context.getUnqualifiedArrayType(UnwrappedSrcType, SrcQuals);
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cv1.push_back(SrcQuals);
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Qualifiers DestQuals;
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Self.Context.getUnqualifiedArrayType(UnwrappedDestType, DestQuals);
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cv2.push_back(DestQuals);
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}
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if (cv1.empty())
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return false;
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// Construct void pointers with those qualifiers (in reverse order of
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// unwrapping, of course).
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QualType SrcConstruct = Self.Context.VoidTy;
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QualType DestConstruct = Self.Context.VoidTy;
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ASTContext &Context = Self.Context;
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for (llvm::SmallVector<Qualifiers, 8>::reverse_iterator i1 = cv1.rbegin(),
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i2 = cv2.rbegin();
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i1 != cv1.rend(); ++i1, ++i2) {
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SrcConstruct
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= Context.getPointerType(Context.getQualifiedType(SrcConstruct, *i1));
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DestConstruct
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= Context.getPointerType(Context.getQualifiedType(DestConstruct, *i2));
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}
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// Test if they're compatible.
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return SrcConstruct != DestConstruct &&
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!Self.IsQualificationConversion(SrcConstruct, DestConstruct, false);
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}
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/// CheckDynamicCast - Check that a dynamic_cast\<DestType\>(SrcExpr) is valid.
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/// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
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/// checked downcasts in class hierarchies.
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static void
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CheckDynamicCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
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ExprValueKind &VK, const SourceRange &OpRange,
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const SourceRange &DestRange, CastKind &Kind,
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CXXCastPath &BasePath) {
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QualType OrigDestType = DestType, OrigSrcType = SrcExpr->getType();
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DestType = Self.Context.getCanonicalType(DestType);
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// C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
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// or "pointer to cv void".
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QualType DestPointee;
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const PointerType *DestPointer = DestType->getAs<PointerType>();
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const ReferenceType *DestReference = 0;
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if (DestPointer) {
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DestPointee = DestPointer->getPointeeType();
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} else if ((DestReference = DestType->getAs<ReferenceType>())) {
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DestPointee = DestReference->getPointeeType();
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VK = isa<LValueReferenceType>(DestReference) ? VK_LValue
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: isa<RValueReferenceType>(DestReference) ? VK_XValue
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: VK_RValue;
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} else {
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Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr)
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<< OrigDestType << DestRange;
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return;
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}
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const RecordType *DestRecord = DestPointee->getAs<RecordType>();
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if (DestPointee->isVoidType()) {
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assert(DestPointer && "Reference to void is not possible");
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} else if (DestRecord) {
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if (Self.RequireCompleteType(OpRange.getBegin(), DestPointee,
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Self.PDiag(diag::err_bad_dynamic_cast_incomplete)
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<< DestRange))
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return;
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} else {
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Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
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<< DestPointee.getUnqualifiedType() << DestRange;
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return;
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}
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// C++0x 5.2.7p2: If T is a pointer type, v shall be an rvalue of a pointer to
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// complete class type, [...]. If T is an lvalue reference type, v shall be
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// an lvalue of a complete class type, [...]. If T is an rvalue reference
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// type, v shall be an expression having a complete class type, [...]
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QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
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QualType SrcPointee;
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if (DestPointer) {
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if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
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SrcPointee = SrcPointer->getPointeeType();
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} else {
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Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr)
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<< OrigSrcType << SrcExpr->getSourceRange();
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return;
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}
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} else if (DestReference->isLValueReferenceType()) {
|
|
if (!SrcExpr->isLValue()) {
|
|
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
|
|
<< CT_Dynamic << OrigSrcType << OrigDestType << OpRange;
|
|
}
|
|
SrcPointee = SrcType;
|
|
} else {
|
|
SrcPointee = SrcType;
|
|
}
|
|
|
|
const RecordType *SrcRecord = SrcPointee->getAs<RecordType>();
|
|
if (SrcRecord) {
|
|
if (Self.RequireCompleteType(OpRange.getBegin(), SrcPointee,
|
|
Self.PDiag(diag::err_bad_dynamic_cast_incomplete)
|
|
<< SrcExpr->getSourceRange()))
|
|
return;
|
|
} else {
|
|
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
|
|
<< SrcPointee.getUnqualifiedType() << SrcExpr->getSourceRange();
|
|
return;
|
|
}
|
|
|
|
assert((DestPointer || DestReference) &&
|
|
"Bad destination non-ptr/ref slipped through.");
|
|
assert((DestRecord || DestPointee->isVoidType()) &&
|
|
"Bad destination pointee slipped through.");
|
|
assert(SrcRecord && "Bad source pointee slipped through.");
|
|
|
|
// C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
|
|
if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
|
|
Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away)
|
|
<< CT_Dynamic << OrigSrcType << OrigDestType << OpRange;
|
|
return;
|
|
}
|
|
|
|
// C++ 5.2.7p3: If the type of v is the same as the required result type,
|
|
// [except for cv].
|
|
if (DestRecord == SrcRecord) {
|
|
Kind = CK_NoOp;
|
|
return;
|
|
}
|
|
|
|
// C++ 5.2.7p5
|
|
// Upcasts are resolved statically.
|
|
if (DestRecord && Self.IsDerivedFrom(SrcPointee, DestPointee)) {
|
|
if (Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
|
|
OpRange.getBegin(), OpRange,
|
|
&BasePath))
|
|
return;
|
|
|
|
Kind = CK_DerivedToBase;
|
|
|
|
// If we are casting to or through a virtual base class, we need a
|
|
// vtable.
|
|
if (Self.BasePathInvolvesVirtualBase(BasePath))
|
|
Self.MarkVTableUsed(OpRange.getBegin(),
|
|
cast<CXXRecordDecl>(SrcRecord->getDecl()));
|
|
return;
|
|
}
|
|
|
|
// C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
|
|
const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition();
|
|
assert(SrcDecl && "Definition missing");
|
|
if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
|
|
Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic)
|
|
<< SrcPointee.getUnqualifiedType() << SrcExpr->getSourceRange();
|
|
}
|
|
Self.MarkVTableUsed(OpRange.getBegin(),
|
|
cast<CXXRecordDecl>(SrcRecord->getDecl()));
|
|
|
|
// Done. Everything else is run-time checks.
|
|
Kind = CK_Dynamic;
|
|
}
|
|
|
|
/// CheckConstCast - Check that a const_cast\<DestType\>(SrcExpr) is valid.
|
|
/// Refer to C++ 5.2.11 for details. const_cast is typically used in code
|
|
/// like this:
|
|
/// const char *str = "literal";
|
|
/// legacy_function(const_cast\<char*\>(str));
|
|
void
|
|
CheckConstCast(Sema &Self, Expr *&SrcExpr, QualType DestType, ExprValueKind &VK,
|
|
const SourceRange &OpRange, const SourceRange &DestRange) {
|
|
VK = Expr::getValueKindForType(DestType);
|
|
if (VK == VK_RValue)
|
|
Self.DefaultFunctionArrayLvalueConversion(SrcExpr);
|
|
|
|
unsigned msg = diag::err_bad_cxx_cast_generic;
|
|
if (TryConstCast(Self, SrcExpr, DestType, /*CStyle*/false, msg) != TC_Success
|
|
&& msg != 0)
|
|
Self.Diag(OpRange.getBegin(), msg) << CT_Const
|
|
<< SrcExpr->getType() << DestType << OpRange;
|
|
}
|
|
|
|
/// CheckReinterpretCast - Check that a reinterpret_cast\<DestType\>(SrcExpr) is
|
|
/// valid.
|
|
/// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
|
|
/// like this:
|
|
/// char *bytes = reinterpret_cast\<char*\>(int_ptr);
|
|
void
|
|
CheckReinterpretCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
|
|
ExprValueKind &VK, const SourceRange &OpRange,
|
|
const SourceRange &DestRange, CastKind &Kind) {
|
|
VK = Expr::getValueKindForType(DestType);
|
|
if (VK == VK_RValue)
|
|
Self.DefaultFunctionArrayLvalueConversion(SrcExpr);
|
|
|
|
unsigned msg = diag::err_bad_cxx_cast_generic;
|
|
if (TryReinterpretCast(Self, SrcExpr, DestType, /*CStyle*/false, OpRange,
|
|
msg, Kind)
|
|
!= TC_Success && msg != 0)
|
|
{
|
|
if (SrcExpr->getType() == Self.Context.OverloadTy) {
|
|
//FIXME: &f<int>; is overloaded and resolvable
|
|
Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_overload)
|
|
<< OverloadExpr::find(SrcExpr).Expression->getName()
|
|
<< DestType << OpRange;
|
|
NoteAllOverloadCandidates(SrcExpr, Self);
|
|
|
|
} else {
|
|
diagnoseBadCast(Self, msg, CT_Reinterpret, OpRange, SrcExpr, DestType);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/// CheckStaticCast - Check that a static_cast\<DestType\>(SrcExpr) is valid.
|
|
/// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
|
|
/// implicit conversions explicit and getting rid of data loss warnings.
|
|
void
|
|
CheckStaticCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
|
|
ExprValueKind &VK, const SourceRange &OpRange,
|
|
CastKind &Kind, CXXCastPath &BasePath) {
|
|
// This test is outside everything else because it's the only case where
|
|
// a non-lvalue-reference target type does not lead to decay.
|
|
// C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
|
|
if (DestType->isVoidType()) {
|
|
Self.IgnoredValueConversions(SrcExpr);
|
|
Kind = CK_ToVoid;
|
|
return;
|
|
}
|
|
|
|
VK = Expr::getValueKindForType(DestType);
|
|
if (VK == VK_RValue && !DestType->isRecordType())
|
|
Self.DefaultFunctionArrayLvalueConversion(SrcExpr);
|
|
|
|
unsigned msg = diag::err_bad_cxx_cast_generic;
|
|
if (TryStaticCast(Self, SrcExpr, DestType, /*CStyle*/false, OpRange, msg,
|
|
Kind, BasePath) != TC_Success && msg != 0)
|
|
{
|
|
if (SrcExpr->getType() == Self.Context.OverloadTy) {
|
|
OverloadExpr* oe = OverloadExpr::find(SrcExpr).Expression;
|
|
Self.Diag(OpRange.getBegin(), diag::err_bad_static_cast_overload)
|
|
<< oe->getName() << DestType << OpRange << oe->getQualifierRange();
|
|
NoteAllOverloadCandidates(SrcExpr, Self);
|
|
} else {
|
|
diagnoseBadCast(Self, msg, CT_Static, OpRange, SrcExpr, DestType);
|
|
}
|
|
}
|
|
else if (Kind == CK_BitCast)
|
|
Self.CheckCastAlign(SrcExpr, DestType, OpRange);
|
|
}
|
|
|
|
/// TryStaticCast - Check if a static cast can be performed, and do so if
|
|
/// possible. If @p CStyle, ignore access restrictions on hierarchy casting
|
|
/// and casting away constness.
|
|
static TryCastResult TryStaticCast(Sema &Self, Expr *&SrcExpr,
|
|
QualType DestType, bool CStyle,
|
|
const SourceRange &OpRange, unsigned &msg,
|
|
CastKind &Kind,
|
|
CXXCastPath &BasePath) {
|
|
// The order the tests is not entirely arbitrary. There is one conversion
|
|
// that can be handled in two different ways. Given:
|
|
// struct A {};
|
|
// struct B : public A {
|
|
// B(); B(const A&);
|
|
// };
|
|
// const A &a = B();
|
|
// the cast static_cast<const B&>(a) could be seen as either a static
|
|
// reference downcast, or an explicit invocation of the user-defined
|
|
// conversion using B's conversion constructor.
|
|
// DR 427 specifies that the downcast is to be applied here.
|
|
|
|
// C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
|
|
// Done outside this function.
|
|
|
|
TryCastResult tcr;
|
|
|
|
// C++ 5.2.9p5, reference downcast.
|
|
// See the function for details.
|
|
// DR 427 specifies that this is to be applied before paragraph 2.
|
|
tcr = TryStaticReferenceDowncast(Self, SrcExpr, DestType, CStyle, OpRange,
|
|
msg, Kind, BasePath);
|
|
if (tcr != TC_NotApplicable)
|
|
return tcr;
|
|
|
|
// C++0x [expr.static.cast]p3:
|
|
// A glvalue of type "cv1 T1" can be cast to type "rvalue reference to cv2
|
|
// T2" if "cv2 T2" is reference-compatible with "cv1 T1".
|
|
tcr = TryLValueToRValueCast(Self, SrcExpr, DestType, CStyle, Kind, BasePath,
|
|
msg);
|
|
if (tcr != TC_NotApplicable)
|
|
return tcr;
|
|
|
|
// C++ 5.2.9p2: An expression e can be explicitly converted to a type T
|
|
// [...] if the declaration "T t(e);" is well-formed, [...].
|
|
tcr = TryStaticImplicitCast(Self, SrcExpr, DestType, CStyle, OpRange, msg,
|
|
Kind);
|
|
if (tcr != TC_NotApplicable)
|
|
return tcr;
|
|
|
|
// C++ 5.2.9p6: May apply the reverse of any standard conversion, except
|
|
// lvalue-to-rvalue, array-to-pointer, function-to-pointer, and boolean
|
|
// conversions, subject to further restrictions.
|
|
// Also, C++ 5.2.9p1 forbids casting away constness, which makes reversal
|
|
// of qualification conversions impossible.
|
|
// In the CStyle case, the earlier attempt to const_cast should have taken
|
|
// care of reverse qualification conversions.
|
|
|
|
QualType SrcType = Self.Context.getCanonicalType(SrcExpr->getType());
|
|
|
|
// C++0x 5.2.9p9: A value of a scoped enumeration type can be explicitly
|
|
// converted to an integral type.
|
|
if (Self.getLangOptions().CPlusPlus0x && SrcType->isEnumeralType()) {
|
|
assert(SrcType->getAs<EnumType>()->getDecl()->isScoped());
|
|
if (DestType->isBooleanType()) {
|
|
Kind = CK_IntegralToBoolean;
|
|
return TC_Success;
|
|
} else if (DestType->isIntegralType(Self.Context)) {
|
|
Kind = CK_IntegralCast;
|
|
return TC_Success;
|
|
}
|
|
}
|
|
|
|
// Reverse integral promotion/conversion. All such conversions are themselves
|
|
// again integral promotions or conversions and are thus already handled by
|
|
// p2 (TryDirectInitialization above).
|
|
// (Note: any data loss warnings should be suppressed.)
|
|
// The exception is the reverse of enum->integer, i.e. integer->enum (and
|
|
// enum->enum). See also C++ 5.2.9p7.
|
|
// The same goes for reverse floating point promotion/conversion and
|
|
// floating-integral conversions. Again, only floating->enum is relevant.
|
|
if (DestType->isEnumeralType()) {
|
|
if (SrcType->isComplexType() || SrcType->isVectorType()) {
|
|
// Fall through - these cannot be converted.
|
|
} else if (SrcType->isArithmeticType() || SrcType->isEnumeralType()) {
|
|
Kind = CK_IntegralCast;
|
|
return TC_Success;
|
|
}
|
|
}
|
|
|
|
// Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
|
|
// C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
|
|
tcr = TryStaticPointerDowncast(Self, SrcType, DestType, CStyle, OpRange, msg,
|
|
Kind, BasePath);
|
|
if (tcr != TC_NotApplicable)
|
|
return tcr;
|
|
|
|
// Reverse member pointer conversion. C++ 4.11 specifies member pointer
|
|
// conversion. C++ 5.2.9p9 has additional information.
|
|
// DR54's access restrictions apply here also.
|
|
tcr = TryStaticMemberPointerUpcast(Self, SrcExpr, SrcType, DestType, CStyle,
|
|
OpRange, msg, Kind, BasePath);
|
|
if (tcr != TC_NotApplicable)
|
|
return tcr;
|
|
|
|
// Reverse pointer conversion to void*. C++ 4.10.p2 specifies conversion to
|
|
// void*. C++ 5.2.9p10 specifies additional restrictions, which really is
|
|
// just the usual constness stuff.
|
|
if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
|
|
QualType SrcPointee = SrcPointer->getPointeeType();
|
|
if (SrcPointee->isVoidType()) {
|
|
if (const PointerType *DestPointer = DestType->getAs<PointerType>()) {
|
|
QualType DestPointee = DestPointer->getPointeeType();
|
|
if (DestPointee->isIncompleteOrObjectType()) {
|
|
// This is definitely the intended conversion, but it might fail due
|
|
// to a const violation.
|
|
if (!CStyle && !DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
|
|
msg = diag::err_bad_cxx_cast_const_away;
|
|
return TC_Failed;
|
|
}
|
|
Kind = CK_BitCast;
|
|
return TC_Success;
|
|
}
|
|
}
|
|
else if (DestType->isObjCObjectPointerType()) {
|
|
// allow both c-style cast and static_cast of objective-c pointers as
|
|
// they are pervasive.
|
|
Kind = CK_AnyPointerToObjCPointerCast;
|
|
return TC_Success;
|
|
}
|
|
else if (CStyle && DestType->isBlockPointerType()) {
|
|
// allow c-style cast of void * to block pointers.
|
|
Kind = CK_AnyPointerToBlockPointerCast;
|
|
return TC_Success;
|
|
}
|
|
}
|
|
}
|
|
// Allow arbitray objective-c pointer conversion with static casts.
|
|
if (SrcType->isObjCObjectPointerType() &&
|
|
DestType->isObjCObjectPointerType()) {
|
|
Kind = CK_BitCast;
|
|
return TC_Success;
|
|
}
|
|
|
|
// We tried everything. Everything! Nothing works! :-(
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
/// Tests whether a conversion according to N2844 is valid.
|
|
TryCastResult
|
|
TryLValueToRValueCast(Sema &Self, Expr *SrcExpr, QualType DestType,
|
|
bool CStyle, CastKind &Kind, CXXCastPath &BasePath,
|
|
unsigned &msg) {
|
|
// C++0x [expr.static.cast]p3:
|
|
// A glvalue of type "cv1 T1" can be cast to type "rvalue reference to
|
|
// cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
|
|
const RValueReferenceType *R = DestType->getAs<RValueReferenceType>();
|
|
if (!R)
|
|
return TC_NotApplicable;
|
|
|
|
if (!SrcExpr->isGLValue())
|
|
return TC_NotApplicable;
|
|
|
|
// Because we try the reference downcast before this function, from now on
|
|
// this is the only cast possibility, so we issue an error if we fail now.
|
|
// FIXME: Should allow casting away constness if CStyle.
|
|
bool DerivedToBase;
|
|
bool ObjCConversion;
|
|
QualType FromType = SrcExpr->getType();
|
|
QualType ToType = R->getPointeeType();
|
|
if (CStyle) {
|
|
FromType = FromType.getUnqualifiedType();
|
|
ToType = ToType.getUnqualifiedType();
|
|
}
|
|
|
|
if (Self.CompareReferenceRelationship(SrcExpr->getLocStart(),
|
|
ToType, FromType,
|
|
DerivedToBase, ObjCConversion) <
|
|
Sema::Ref_Compatible_With_Added_Qualification) {
|
|
msg = diag::err_bad_lvalue_to_rvalue_cast;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (DerivedToBase) {
|
|
Kind = CK_DerivedToBase;
|
|
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
|
|
/*DetectVirtual=*/true);
|
|
if (!Self.IsDerivedFrom(SrcExpr->getType(), R->getPointeeType(), Paths))
|
|
return TC_NotApplicable;
|
|
|
|
Self.BuildBasePathArray(Paths, BasePath);
|
|
} else
|
|
Kind = CK_NoOp;
|
|
|
|
return TC_Success;
|
|
}
|
|
|
|
/// Tests whether a conversion according to C++ 5.2.9p5 is valid.
|
|
TryCastResult
|
|
TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType,
|
|
bool CStyle, const SourceRange &OpRange,
|
|
unsigned &msg, CastKind &Kind,
|
|
CXXCastPath &BasePath) {
|
|
// C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
|
|
// cast to type "reference to cv2 D", where D is a class derived from B,
|
|
// if a valid standard conversion from "pointer to D" to "pointer to B"
|
|
// exists, cv2 >= cv1, and B is not a virtual base class of D.
|
|
// In addition, DR54 clarifies that the base must be accessible in the
|
|
// current context. Although the wording of DR54 only applies to the pointer
|
|
// variant of this rule, the intent is clearly for it to apply to the this
|
|
// conversion as well.
|
|
|
|
const ReferenceType *DestReference = DestType->getAs<ReferenceType>();
|
|
if (!DestReference) {
|
|
return TC_NotApplicable;
|
|
}
|
|
bool RValueRef = DestReference->isRValueReferenceType();
|
|
if (!RValueRef && !SrcExpr->isLValue()) {
|
|
// We know the left side is an lvalue reference, so we can suggest a reason.
|
|
msg = diag::err_bad_cxx_cast_rvalue;
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
QualType DestPointee = DestReference->getPointeeType();
|
|
|
|
return TryStaticDowncast(Self,
|
|
Self.Context.getCanonicalType(SrcExpr->getType()),
|
|
Self.Context.getCanonicalType(DestPointee), CStyle,
|
|
OpRange, SrcExpr->getType(), DestType, msg, Kind,
|
|
BasePath);
|
|
}
|
|
|
|
/// Tests whether a conversion according to C++ 5.2.9p8 is valid.
|
|
TryCastResult
|
|
TryStaticPointerDowncast(Sema &Self, QualType SrcType, QualType DestType,
|
|
bool CStyle, const SourceRange &OpRange,
|
|
unsigned &msg, CastKind &Kind,
|
|
CXXCastPath &BasePath) {
|
|
// C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
|
|
// type, can be converted to an rvalue of type "pointer to cv2 D", where D
|
|
// is a class derived from B, if a valid standard conversion from "pointer
|
|
// to D" to "pointer to B" exists, cv2 >= cv1, and B is not a virtual base
|
|
// class of D.
|
|
// In addition, DR54 clarifies that the base must be accessible in the
|
|
// current context.
|
|
|
|
const PointerType *DestPointer = DestType->getAs<PointerType>();
|
|
if (!DestPointer) {
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
const PointerType *SrcPointer = SrcType->getAs<PointerType>();
|
|
if (!SrcPointer) {
|
|
msg = diag::err_bad_static_cast_pointer_nonpointer;
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
return TryStaticDowncast(Self,
|
|
Self.Context.getCanonicalType(SrcPointer->getPointeeType()),
|
|
Self.Context.getCanonicalType(DestPointer->getPointeeType()),
|
|
CStyle, OpRange, SrcType, DestType, msg, Kind,
|
|
BasePath);
|
|
}
|
|
|
|
/// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
|
|
/// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
|
|
/// DestType is possible and allowed.
|
|
TryCastResult
|
|
TryStaticDowncast(Sema &Self, CanQualType SrcType, CanQualType DestType,
|
|
bool CStyle, const SourceRange &OpRange, QualType OrigSrcType,
|
|
QualType OrigDestType, unsigned &msg,
|
|
CastKind &Kind, CXXCastPath &BasePath) {
|
|
// We can only work with complete types. But don't complain if it doesn't work
|
|
if (Self.RequireCompleteType(OpRange.getBegin(), SrcType, Self.PDiag(0)) ||
|
|
Self.RequireCompleteType(OpRange.getBegin(), DestType, Self.PDiag(0)))
|
|
return TC_NotApplicable;
|
|
|
|
// Downcast can only happen in class hierarchies, so we need classes.
|
|
if (!DestType->getAs<RecordType>() || !SrcType->getAs<RecordType>()) {
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
|
|
/*DetectVirtual=*/true);
|
|
if (!Self.IsDerivedFrom(DestType, SrcType, Paths)) {
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
// Target type does derive from source type. Now we're serious. If an error
|
|
// appears now, it's not ignored.
|
|
// This may not be entirely in line with the standard. Take for example:
|
|
// struct A {};
|
|
// struct B : virtual A {
|
|
// B(A&);
|
|
// };
|
|
//
|
|
// void f()
|
|
// {
|
|
// (void)static_cast<const B&>(*((A*)0));
|
|
// }
|
|
// As far as the standard is concerned, p5 does not apply (A is virtual), so
|
|
// p2 should be used instead - "const B& t(*((A*)0));" is perfectly valid.
|
|
// However, both GCC and Comeau reject this example, and accepting it would
|
|
// mean more complex code if we're to preserve the nice error message.
|
|
// FIXME: Being 100% compliant here would be nice to have.
|
|
|
|
// Must preserve cv, as always, unless we're in C-style mode.
|
|
if (!CStyle && !DestType.isAtLeastAsQualifiedAs(SrcType)) {
|
|
msg = diag::err_bad_cxx_cast_const_away;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (Paths.isAmbiguous(SrcType.getUnqualifiedType())) {
|
|
// This code is analoguous to that in CheckDerivedToBaseConversion, except
|
|
// that it builds the paths in reverse order.
|
|
// To sum up: record all paths to the base and build a nice string from
|
|
// them. Use it to spice up the error message.
|
|
if (!Paths.isRecordingPaths()) {
|
|
Paths.clear();
|
|
Paths.setRecordingPaths(true);
|
|
Self.IsDerivedFrom(DestType, SrcType, Paths);
|
|
}
|
|
std::string PathDisplayStr;
|
|
std::set<unsigned> DisplayedPaths;
|
|
for (CXXBasePaths::paths_iterator PI = Paths.begin(), PE = Paths.end();
|
|
PI != PE; ++PI) {
|
|
if (DisplayedPaths.insert(PI->back().SubobjectNumber).second) {
|
|
// We haven't displayed a path to this particular base
|
|
// class subobject yet.
|
|
PathDisplayStr += "\n ";
|
|
for (CXXBasePath::const_reverse_iterator EI = PI->rbegin(),
|
|
EE = PI->rend();
|
|
EI != EE; ++EI)
|
|
PathDisplayStr += EI->Base->getType().getAsString() + " -> ";
|
|
PathDisplayStr += QualType(DestType).getAsString();
|
|
}
|
|
}
|
|
|
|
Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast)
|
|
<< QualType(SrcType).getUnqualifiedType()
|
|
<< QualType(DestType).getUnqualifiedType()
|
|
<< PathDisplayStr << OpRange;
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (Paths.getDetectedVirtual() != 0) {
|
|
QualType VirtualBase(Paths.getDetectedVirtual(), 0);
|
|
Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual)
|
|
<< OrigSrcType << OrigDestType << VirtualBase << OpRange;
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (!CStyle) {
|
|
switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
|
|
SrcType, DestType,
|
|
Paths.front(),
|
|
diag::err_downcast_from_inaccessible_base)) {
|
|
case Sema::AR_accessible:
|
|
case Sema::AR_delayed: // be optimistic
|
|
case Sema::AR_dependent: // be optimistic
|
|
break;
|
|
|
|
case Sema::AR_inaccessible:
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
}
|
|
|
|
Self.BuildBasePathArray(Paths, BasePath);
|
|
Kind = CK_BaseToDerived;
|
|
return TC_Success;
|
|
}
|
|
|
|
/// 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 [...].
|
|
///
|
|
TryCastResult
|
|
TryStaticMemberPointerUpcast(Sema &Self, Expr *&SrcExpr, QualType SrcType,
|
|
QualType DestType, bool CStyle,
|
|
const SourceRange &OpRange,
|
|
unsigned &msg, CastKind &Kind,
|
|
CXXCastPath &BasePath) {
|
|
const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>();
|
|
if (!DestMemPtr)
|
|
return TC_NotApplicable;
|
|
|
|
bool WasOverloadedFunction = false;
|
|
DeclAccessPair FoundOverload;
|
|
if (SrcExpr->getType() == Self.Context.OverloadTy) {
|
|
if (FunctionDecl *Fn
|
|
= Self.ResolveAddressOfOverloadedFunction(SrcExpr, DestType, false,
|
|
FoundOverload)) {
|
|
CXXMethodDecl *M = cast<CXXMethodDecl>(Fn);
|
|
SrcType = Self.Context.getMemberPointerType(Fn->getType(),
|
|
Self.Context.getTypeDeclType(M->getParent()).getTypePtr());
|
|
WasOverloadedFunction = true;
|
|
}
|
|
}
|
|
|
|
const MemberPointerType *SrcMemPtr = SrcType->getAs<MemberPointerType>();
|
|
if (!SrcMemPtr) {
|
|
msg = diag::err_bad_static_cast_member_pointer_nonmp;
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
// T == T, modulo cv
|
|
if (!Self.Context.hasSameUnqualifiedType(SrcMemPtr->getPointeeType(),
|
|
DestMemPtr->getPointeeType()))
|
|
return TC_NotApplicable;
|
|
|
|
// B base of D
|
|
QualType SrcClass(SrcMemPtr->getClass(), 0);
|
|
QualType DestClass(DestMemPtr->getClass(), 0);
|
|
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
|
|
/*DetectVirtual=*/true);
|
|
if (!Self.IsDerivedFrom(SrcClass, DestClass, Paths)) {
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
// B is a base of D. But is it an allowed base? If not, it's a hard error.
|
|
if (Paths.isAmbiguous(Self.Context.getCanonicalType(DestClass))) {
|
|
Paths.clear();
|
|
Paths.setRecordingPaths(true);
|
|
bool StillOkay = Self.IsDerivedFrom(SrcClass, DestClass, Paths);
|
|
assert(StillOkay);
|
|
(void)StillOkay;
|
|
std::string PathDisplayStr = Self.getAmbiguousPathsDisplayString(Paths);
|
|
Self.Diag(OpRange.getBegin(), diag::err_ambiguous_memptr_conv)
|
|
<< 1 << SrcClass << DestClass << PathDisplayStr << OpRange;
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (const RecordType *VBase = Paths.getDetectedVirtual()) {
|
|
Self.Diag(OpRange.getBegin(), diag::err_memptr_conv_via_virtual)
|
|
<< SrcClass << DestClass << QualType(VBase, 0) << OpRange;
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (!CStyle) {
|
|
switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
|
|
DestClass, SrcClass,
|
|
Paths.front(),
|
|
diag::err_upcast_to_inaccessible_base)) {
|
|
case Sema::AR_accessible:
|
|
case Sema::AR_delayed:
|
|
case Sema::AR_dependent:
|
|
// Optimistically assume that the delayed and dependent cases
|
|
// will work out.
|
|
break;
|
|
|
|
case Sema::AR_inaccessible:
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
}
|
|
|
|
if (WasOverloadedFunction) {
|
|
// Resolve the address of the overloaded function again, this time
|
|
// allowing complaints if something goes wrong.
|
|
FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr,
|
|
DestType,
|
|
true,
|
|
FoundOverload);
|
|
if (!Fn) {
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
|
|
SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr, FoundOverload, Fn);
|
|
if (!SrcExpr) {
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
}
|
|
|
|
Self.BuildBasePathArray(Paths, BasePath);
|
|
Kind = CK_DerivedToBaseMemberPointer;
|
|
return TC_Success;
|
|
}
|
|
|
|
/// 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
|
|
/// @c static_cast if the declaration "T t(e);" is well-formed [...].
|
|
TryCastResult
|
|
TryStaticImplicitCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
|
|
bool CStyle, const SourceRange &OpRange, unsigned &msg,
|
|
CastKind &Kind) {
|
|
if (DestType->isRecordType()) {
|
|
if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
|
|
diag::err_bad_dynamic_cast_incomplete)) {
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
}
|
|
|
|
InitializedEntity Entity = InitializedEntity::InitializeTemporary(DestType);
|
|
InitializationKind InitKind
|
|
= InitializationKind::CreateCast(/*FIXME:*/OpRange, CStyle);
|
|
InitializationSequence InitSeq(Self, Entity, InitKind, &SrcExpr, 1);
|
|
|
|
// At this point of CheckStaticCast, if the destination is a reference,
|
|
// or the expression is an overload expression this has to work.
|
|
// There is no other way that works.
|
|
// On the other hand, if we're checking a C-style cast, we've still got
|
|
// the reinterpret_cast way.
|
|
|
|
if (InitSeq.getKind() == InitializationSequence::FailedSequence &&
|
|
(CStyle || !DestType->isReferenceType()))
|
|
return TC_NotApplicable;
|
|
|
|
ExprResult Result
|
|
= InitSeq.Perform(Self, Entity, InitKind, MultiExprArg(Self, &SrcExpr, 1));
|
|
if (Result.isInvalid()) {
|
|
msg = 0;
|
|
return TC_Failed;
|
|
}
|
|
|
|
if (InitSeq.isConstructorInitialization())
|
|
Kind = CK_ConstructorConversion;
|
|
else
|
|
Kind = CK_NoOp;
|
|
|
|
SrcExpr = Result.takeAs<Expr>();
|
|
return TC_Success;
|
|
}
|
|
|
|
/// TryConstCast - See if a const_cast from source to destination is allowed,
|
|
/// and perform it if it is.
|
|
static TryCastResult TryConstCast(Sema &Self, Expr *SrcExpr, QualType DestType,
|
|
bool CStyle, unsigned &msg) {
|
|
DestType = Self.Context.getCanonicalType(DestType);
|
|
QualType SrcType = SrcExpr->getType();
|
|
if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
|
|
if (DestTypeTmp->isLValueReferenceType() && !SrcExpr->isLValue()) {
|
|
// Cannot const_cast non-lvalue to lvalue reference type. But if this
|
|
// is C-style, static_cast might find a way, so we simply suggest a
|
|
// message and tell the parent to keep searching.
|
|
msg = diag::err_bad_cxx_cast_rvalue;
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
// C++ 5.2.11p4: An lvalue of type T1 can be [cast] to an lvalue of type T2
|
|
// [...] if a pointer to T1 can be [cast] to the type pointer to T2.
|
|
DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
|
|
SrcType = Self.Context.getPointerType(SrcType);
|
|
}
|
|
|
|
// C++ 5.2.11p5: For a const_cast involving pointers to data members [...]
|
|
// the rules for const_cast are the same as those used for pointers.
|
|
|
|
if (!DestType->isPointerType() &&
|
|
!DestType->isMemberPointerType() &&
|
|
!DestType->isObjCObjectPointerType()) {
|
|
// Cannot cast to non-pointer, non-reference type. Note that, if DestType
|
|
// was a reference type, we converted it to a pointer above.
|
|
// The status of rvalue references isn't entirely clear, but it looks like
|
|
// conversion to them is simply invalid.
|
|
// C++ 5.2.11p3: For two pointer types [...]
|
|
if (!CStyle)
|
|
msg = diag::err_bad_const_cast_dest;
|
|
return TC_NotApplicable;
|
|
}
|
|
if (DestType->isFunctionPointerType() ||
|
|
DestType->isMemberFunctionPointerType()) {
|
|
// Cannot cast direct function pointers.
|
|
// C++ 5.2.11p2: [...] where T is any object type or the void type [...]
|
|
// T is the ultimate pointee of source and target type.
|
|
if (!CStyle)
|
|
msg = diag::err_bad_const_cast_dest;
|
|
return TC_NotApplicable;
|
|
}
|
|
SrcType = Self.Context.getCanonicalType(SrcType);
|
|
|
|
// Unwrap the pointers. Ignore qualifiers. Terminate early if the types are
|
|
// completely equal.
|
|
// FIXME: const_cast should probably not be able to convert between pointers
|
|
// to different address spaces.
|
|
// C++ 5.2.11p3 describes the core semantics of const_cast. All cv specifiers
|
|
// in multi-level pointers may change, but the level count must be the same,
|
|
// as must be the final pointee type.
|
|
while (SrcType != DestType &&
|
|
Self.Context.UnwrapSimilarPointerTypes(SrcType, DestType)) {
|
|
Qualifiers Quals;
|
|
SrcType = Self.Context.getUnqualifiedArrayType(SrcType, Quals);
|
|
DestType = Self.Context.getUnqualifiedArrayType(DestType, Quals);
|
|
}
|
|
|
|
// Since we're dealing in canonical types, the remainder must be the same.
|
|
if (SrcType != DestType)
|
|
return TC_NotApplicable;
|
|
|
|
return TC_Success;
|
|
}
|
|
|
|
|
|
static void NoteAllOverloadCandidates(Expr* const Expr, Sema& sema)
|
|
{
|
|
|
|
assert(Expr->getType() == sema.Context.OverloadTy);
|
|
|
|
OverloadExpr::FindResult Ovl = OverloadExpr::find(Expr);
|
|
OverloadExpr *const OvlExpr = Ovl.Expression;
|
|
|
|
for (UnresolvedSetIterator it = OvlExpr->decls_begin(),
|
|
end = OvlExpr->decls_end(); it != end; ++it) {
|
|
if ( FunctionTemplateDecl *ftd =
|
|
dyn_cast<FunctionTemplateDecl>((*it)->getUnderlyingDecl()) )
|
|
{
|
|
sema.NoteOverloadCandidate(ftd->getTemplatedDecl());
|
|
}
|
|
else if ( FunctionDecl *f =
|
|
dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl()) )
|
|
{
|
|
sema.NoteOverloadCandidate(f);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static TryCastResult TryReinterpretCast(Sema &Self, Expr *SrcExpr,
|
|
QualType DestType, bool CStyle,
|
|
const SourceRange &OpRange,
|
|
unsigned &msg,
|
|
CastKind &Kind) {
|
|
bool IsLValueCast = false;
|
|
|
|
DestType = Self.Context.getCanonicalType(DestType);
|
|
QualType SrcType = SrcExpr->getType();
|
|
|
|
// Is the source an overloaded name? (i.e. &foo)
|
|
// If so, reinterpret_cast can not help us here (13.4, p1, bullet 5)
|
|
if (SrcType == Self.Context.OverloadTy)
|
|
return TC_NotApplicable;
|
|
|
|
if (const ReferenceType *DestTypeTmp = DestType->getAs<ReferenceType>()) {
|
|
bool LValue = DestTypeTmp->isLValueReferenceType();
|
|
if (LValue && !SrcExpr->isLValue()) {
|
|
// Cannot cast non-lvalue to lvalue reference type. See the similar
|
|
// comment in const_cast.
|
|
msg = diag::err_bad_cxx_cast_rvalue;
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
// C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
|
|
// same effect as the conversion *reinterpret_cast<T*>(&x) with the
|
|
// built-in & and * operators.
|
|
// This code does this transformation for the checked types.
|
|
DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
|
|
SrcType = Self.Context.getPointerType(SrcType);
|
|
|
|
IsLValueCast = true;
|
|
}
|
|
|
|
// Canonicalize source for comparison.
|
|
SrcType = Self.Context.getCanonicalType(SrcType);
|
|
|
|
const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>(),
|
|
*SrcMemPtr = SrcType->getAs<MemberPointerType>();
|
|
if (DestMemPtr && SrcMemPtr) {
|
|
// C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
|
|
// can be explicitly converted to an rvalue of type "pointer to member
|
|
// of Y of type T2" if T1 and T2 are both function types or both object
|
|
// types.
|
|
if (DestMemPtr->getPointeeType()->isFunctionType() !=
|
|
SrcMemPtr->getPointeeType()->isFunctionType())
|
|
return TC_NotApplicable;
|
|
|
|
// C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
|
|
// constness.
|
|
// A reinterpret_cast followed by a const_cast can, though, so in C-style,
|
|
// we accept it.
|
|
if (!CStyle && CastsAwayConstness(Self, SrcType, DestType)) {
|
|
msg = diag::err_bad_cxx_cast_const_away;
|
|
return TC_Failed;
|
|
}
|
|
|
|
// Don't allow casting between member pointers of different sizes.
|
|
if (Self.Context.getTypeSize(DestMemPtr) !=
|
|
Self.Context.getTypeSize(SrcMemPtr)) {
|
|
msg = diag::err_bad_cxx_cast_member_pointer_size;
|
|
return TC_Failed;
|
|
}
|
|
|
|
// A valid member pointer cast.
|
|
Kind = IsLValueCast? CK_LValueBitCast : CK_BitCast;
|
|
return TC_Success;
|
|
}
|
|
|
|
// See below for the enumeral issue.
|
|
if (SrcType->isNullPtrType() && DestType->isIntegralType(Self.Context)) {
|
|
// C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
|
|
// type large enough to hold it. A value of std::nullptr_t can be
|
|
// converted to an integral type; the conversion has the same meaning
|
|
// and validity as a conversion of (void*)0 to the integral type.
|
|
if (Self.Context.getTypeSize(SrcType) >
|
|
Self.Context.getTypeSize(DestType)) {
|
|
msg = diag::err_bad_reinterpret_cast_small_int;
|
|
return TC_Failed;
|
|
}
|
|
Kind = CK_PointerToIntegral;
|
|
return TC_Success;
|
|
}
|
|
|
|
bool destIsVector = DestType->isVectorType();
|
|
bool srcIsVector = SrcType->isVectorType();
|
|
if (srcIsVector || destIsVector) {
|
|
// FIXME: Should this also apply to floating point types?
|
|
bool srcIsScalar = SrcType->isIntegralType(Self.Context);
|
|
bool destIsScalar = DestType->isIntegralType(Self.Context);
|
|
|
|
// Check if this is a cast between a vector and something else.
|
|
if (!(srcIsScalar && destIsVector) && !(srcIsVector && destIsScalar) &&
|
|
!(srcIsVector && destIsVector))
|
|
return TC_NotApplicable;
|
|
|
|
// If both types have the same size, we can successfully cast.
|
|
if (Self.Context.getTypeSize(SrcType)
|
|
== Self.Context.getTypeSize(DestType)) {
|
|
Kind = CK_BitCast;
|
|
return TC_Success;
|
|
}
|
|
|
|
if (destIsScalar)
|
|
msg = diag::err_bad_cxx_cast_vector_to_scalar_different_size;
|
|
else if (srcIsScalar)
|
|
msg = diag::err_bad_cxx_cast_scalar_to_vector_different_size;
|
|
else
|
|
msg = diag::err_bad_cxx_cast_vector_to_vector_different_size;
|
|
|
|
return TC_Failed;
|
|
}
|
|
|
|
bool destIsPtr = DestType->isAnyPointerType() ||
|
|
DestType->isBlockPointerType();
|
|
bool srcIsPtr = SrcType->isAnyPointerType() ||
|
|
SrcType->isBlockPointerType();
|
|
if (!destIsPtr && !srcIsPtr) {
|
|
// Except for std::nullptr_t->integer and lvalue->reference, which are
|
|
// handled above, at least one of the two arguments must be a pointer.
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
if (SrcType == DestType) {
|
|
// C++ 5.2.10p2 has a note that mentions that, subject to all other
|
|
// restrictions, a cast to the same type is allowed. The intent is not
|
|
// entirely clear here, since all other paragraphs explicitly forbid casts
|
|
// to the same type. However, the behavior of compilers is pretty consistent
|
|
// on this point: allow same-type conversion if the involved types are
|
|
// pointers, disallow otherwise.
|
|
Kind = CK_NoOp;
|
|
return TC_Success;
|
|
}
|
|
|
|
if (DestType->isIntegralType(Self.Context)) {
|
|
assert(srcIsPtr && "One type must be a pointer");
|
|
// C++ 5.2.10p4: A pointer can be explicitly converted to any integral
|
|
// type large enough to hold it.
|
|
if (Self.Context.getTypeSize(SrcType) >
|
|
Self.Context.getTypeSize(DestType)) {
|
|
msg = diag::err_bad_reinterpret_cast_small_int;
|
|
return TC_Failed;
|
|
}
|
|
Kind = CK_PointerToIntegral;
|
|
return TC_Success;
|
|
}
|
|
|
|
if (SrcType->isIntegralOrEnumerationType()) {
|
|
assert(destIsPtr && "One type must be a pointer");
|
|
// C++ 5.2.10p5: A value of integral or enumeration type can be explicitly
|
|
// converted to a pointer.
|
|
// C++ 5.2.10p9: [Note: ...a null pointer constant of integral type is not
|
|
// necessarily converted to a null pointer value.]
|
|
Kind = CK_IntegralToPointer;
|
|
return TC_Success;
|
|
}
|
|
|
|
if (!destIsPtr || !srcIsPtr) {
|
|
// With the valid non-pointer conversions out of the way, we can be even
|
|
// more stringent.
|
|
return TC_NotApplicable;
|
|
}
|
|
|
|
// C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
|
|
// The C-style cast operator can.
|
|
if (!CStyle && CastsAwayConstness(Self, SrcType, DestType)) {
|
|
msg = diag::err_bad_cxx_cast_const_away;
|
|
return TC_Failed;
|
|
}
|
|
|
|
// Cannot convert between block pointers and Objective-C object pointers.
|
|
if ((SrcType->isBlockPointerType() && DestType->isObjCObjectPointerType()) ||
|
|
(DestType->isBlockPointerType() && SrcType->isObjCObjectPointerType()))
|
|
return TC_NotApplicable;
|
|
|
|
// Any pointer can be cast to an Objective-C pointer type with a C-style
|
|
// cast.
|
|
if (CStyle && DestType->isObjCObjectPointerType()) {
|
|
Kind = CK_AnyPointerToObjCPointerCast;
|
|
return TC_Success;
|
|
}
|
|
|
|
// Not casting away constness, so the only remaining check is for compatible
|
|
// pointer categories.
|
|
Kind = IsLValueCast? CK_LValueBitCast : CK_BitCast;
|
|
|
|
if (SrcType->isFunctionPointerType()) {
|
|
if (DestType->isFunctionPointerType()) {
|
|
// C++ 5.2.10p6: A pointer to a function can be explicitly converted to
|
|
// a pointer to a function of a different type.
|
|
return TC_Success;
|
|
}
|
|
|
|
// C++0x 5.2.10p8: Converting a pointer to a function into a pointer to
|
|
// an object type or vice versa is conditionally-supported.
|
|
// Compilers support it in C++03 too, though, because it's necessary for
|
|
// casting the return value of dlsym() and GetProcAddress().
|
|
// FIXME: Conditionally-supported behavior should be configurable in the
|
|
// TargetInfo or similar.
|
|
if (!Self.getLangOptions().CPlusPlus0x)
|
|
Self.Diag(OpRange.getBegin(), diag::ext_cast_fn_obj) << OpRange;
|
|
return TC_Success;
|
|
}
|
|
|
|
if (DestType->isFunctionPointerType()) {
|
|
// See above.
|
|
if (!Self.getLangOptions().CPlusPlus0x)
|
|
Self.Diag(OpRange.getBegin(), diag::ext_cast_fn_obj) << OpRange;
|
|
return TC_Success;
|
|
}
|
|
|
|
// C++ 5.2.10p7: A pointer to an object can be explicitly converted to
|
|
// a pointer to an object of different type.
|
|
// Void pointers are not specified, but supported by every compiler out there.
|
|
// So we finish by allowing everything that remains - it's got to be two
|
|
// object pointers.
|
|
return TC_Success;
|
|
}
|
|
|
|
bool
|
|
Sema::CXXCheckCStyleCast(SourceRange R, QualType CastTy, ExprValueKind &VK,
|
|
Expr *&CastExpr, CastKind &Kind,
|
|
CXXCastPath &BasePath,
|
|
bool FunctionalStyle) {
|
|
if (CastExpr->isBoundMemberFunction(Context))
|
|
return Diag(CastExpr->getLocStart(),
|
|
diag::err_invalid_use_of_bound_member_func)
|
|
<< CastExpr->getSourceRange();
|
|
|
|
// This test is outside everything else because it's the only case where
|
|
// a non-lvalue-reference target type does not lead to decay.
|
|
// C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
|
|
if (CastTy->isVoidType()) {
|
|
IgnoredValueConversions(CastExpr);
|
|
Kind = CK_ToVoid;
|
|
return false;
|
|
}
|
|
|
|
// Make sure we determine the value kind before we bail out for
|
|
// dependent types.
|
|
VK = Expr::getValueKindForType(CastTy);
|
|
|
|
// If the type is dependent, we won't do any other semantic analysis now.
|
|
if (CastTy->isDependentType() || CastExpr->isTypeDependent()) {
|
|
Kind = CK_Dependent;
|
|
return false;
|
|
}
|
|
|
|
if (VK == VK_RValue && !CastTy->isRecordType())
|
|
DefaultFunctionArrayLvalueConversion(CastExpr);
|
|
|
|
// C++ [expr.cast]p5: The conversions performed by
|
|
// - a const_cast,
|
|
// - a static_cast,
|
|
// - a static_cast followed by a const_cast,
|
|
// - a reinterpret_cast, or
|
|
// - a reinterpret_cast followed by a const_cast,
|
|
// can be performed using the cast notation of explicit type conversion.
|
|
// [...] If a conversion can be interpreted in more than one of the ways
|
|
// listed above, the interpretation that appears first in the list is used,
|
|
// even if a cast resulting from that interpretation is ill-formed.
|
|
// In plain language, this means trying a const_cast ...
|
|
unsigned msg = diag::err_bad_cxx_cast_generic;
|
|
TryCastResult tcr = TryConstCast(*this, CastExpr, CastTy, /*CStyle*/true,
|
|
msg);
|
|
if (tcr == TC_Success)
|
|
Kind = CK_NoOp;
|
|
|
|
if (tcr == TC_NotApplicable) {
|
|
// ... or if that is not possible, a static_cast, ignoring const, ...
|
|
tcr = TryStaticCast(*this, CastExpr, CastTy, /*CStyle*/true, R, msg, Kind,
|
|
BasePath);
|
|
if (tcr == TC_NotApplicable) {
|
|
// ... and finally a reinterpret_cast, ignoring const.
|
|
tcr = TryReinterpretCast(*this, CastExpr, CastTy, /*CStyle*/true, R, msg,
|
|
Kind);
|
|
}
|
|
}
|
|
|
|
if (tcr != TC_Success && msg != 0) {
|
|
if (CastExpr->getType() == Context.OverloadTy) {
|
|
DeclAccessPair Found;
|
|
FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(CastExpr,
|
|
CastTy,
|
|
/* Complain */ true,
|
|
Found);
|
|
assert(!Fn && "cast failed but able to resolve overload expression!!");
|
|
(void)Fn;
|
|
|
|
} else {
|
|
diagnoseBadCast(*this, msg, (FunctionalStyle ? CT_Functional : CT_CStyle),
|
|
R, CastExpr, CastTy);
|
|
}
|
|
}
|
|
else if (Kind == CK_BitCast)
|
|
CheckCastAlign(CastExpr, CastTy, R);
|
|
|
|
return tcr != TC_Success;
|
|
}
|