//===--- Expr.cpp - Expression AST Node Implementation --------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the Expr class and subclasses. // //===----------------------------------------------------------------------===// #include "clang/AST/Expr.h" #include "clang/AST/ExprCXX.h" #include "clang/AST/APValue.h" #include "clang/AST/ASTContext.h" #include "clang/AST/DeclObjC.h" #include "clang/AST/DeclCXX.h" #include "clang/AST/DeclTemplate.h" #include "clang/AST/RecordLayout.h" #include "clang/AST/StmtVisitor.h" #include "clang/Lex/LiteralSupport.h" #include "clang/Lex/Lexer.h" #include "clang/Basic/Builtins.h" #include "clang/Basic/SourceManager.h" #include "clang/Basic/TargetInfo.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" #include using namespace clang; void Expr::ANCHOR() {} // key function for Expr class. /// isKnownToHaveBooleanValue - Return true if this is an integer expression /// that is known to return 0 or 1. This happens for _Bool/bool expressions /// but also int expressions which are produced by things like comparisons in /// C. bool Expr::isKnownToHaveBooleanValue() const { // If this value has _Bool type, it is obvious 0/1. if (getType()->isBooleanType()) return true; // If this is a non-scalar-integer type, we don't care enough to try. if (!getType()->isIntegralOrEnumerationType()) return false; if (const ParenExpr *PE = dyn_cast(this)) return PE->getSubExpr()->isKnownToHaveBooleanValue(); if (const UnaryOperator *UO = dyn_cast(this)) { switch (UO->getOpcode()) { case UO_Plus: case UO_Extension: return UO->getSubExpr()->isKnownToHaveBooleanValue(); default: return false; } } // Only look through implicit casts. If the user writes // '(int) (a && b)' treat it as an arbitrary int. if (const ImplicitCastExpr *CE = dyn_cast(this)) return CE->getSubExpr()->isKnownToHaveBooleanValue(); if (const BinaryOperator *BO = dyn_cast(this)) { switch (BO->getOpcode()) { default: return false; case BO_LT: // Relational operators. case BO_GT: case BO_LE: case BO_GE: case BO_EQ: // Equality operators. case BO_NE: case BO_LAnd: // AND operator. case BO_LOr: // Logical OR operator. return true; case BO_And: // Bitwise AND operator. case BO_Xor: // Bitwise XOR operator. case BO_Or: // Bitwise OR operator. // Handle things like (x==2)|(y==12). return BO->getLHS()->isKnownToHaveBooleanValue() && BO->getRHS()->isKnownToHaveBooleanValue(); case BO_Comma: case BO_Assign: return BO->getRHS()->isKnownToHaveBooleanValue(); } } if (const ConditionalOperator *CO = dyn_cast(this)) return CO->getTrueExpr()->isKnownToHaveBooleanValue() && CO->getFalseExpr()->isKnownToHaveBooleanValue(); return false; } //===----------------------------------------------------------------------===// // Primary Expressions. //===----------------------------------------------------------------------===// void ExplicitTemplateArgumentList::initializeFrom( const TemplateArgumentListInfo &Info) { LAngleLoc = Info.getLAngleLoc(); RAngleLoc = Info.getRAngleLoc(); NumTemplateArgs = Info.size(); TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); for (unsigned i = 0; i != NumTemplateArgs; ++i) new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); } void ExplicitTemplateArgumentList::copyInto( TemplateArgumentListInfo &Info) const { Info.setLAngleLoc(LAngleLoc); Info.setRAngleLoc(RAngleLoc); for (unsigned I = 0; I != NumTemplateArgs; ++I) Info.addArgument(getTemplateArgs()[I]); } std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) { return sizeof(ExplicitTemplateArgumentList) + sizeof(TemplateArgumentLoc) * NumTemplateArgs; } std::size_t ExplicitTemplateArgumentList::sizeFor( const TemplateArgumentListInfo &Info) { return sizeFor(Info.size()); } void DeclRefExpr::computeDependence() { ExprBits.TypeDependent = false; ExprBits.ValueDependent = false; NamedDecl *D = getDecl(); // (TD) C++ [temp.dep.expr]p3: // An id-expression is type-dependent if it contains: // // and // // (VD) C++ [temp.dep.constexpr]p2: // An identifier is value-dependent if it is: // (TD) - an identifier that was declared with dependent type // (VD) - a name declared with a dependent type, if (getType()->isDependentType()) { ExprBits.TypeDependent = true; ExprBits.ValueDependent = true; } // (TD) - a conversion-function-id that specifies a dependent type else if (D->getDeclName().getNameKind() == DeclarationName::CXXConversionFunctionName && D->getDeclName().getCXXNameType()->isDependentType()) { ExprBits.TypeDependent = true; ExprBits.ValueDependent = true; } // (TD) - a template-id that is dependent, else if (hasExplicitTemplateArgs() && TemplateSpecializationType::anyDependentTemplateArguments( getTemplateArgs(), getNumTemplateArgs())) { ExprBits.TypeDependent = true; ExprBits.ValueDependent = true; } // (VD) - the name of a non-type template parameter, else if (isa(D)) ExprBits.ValueDependent = true; // (VD) - a constant with integral or enumeration type and is // initialized with an expression that is value-dependent. else if (VarDecl *Var = dyn_cast(D)) { if (Var->getType()->isIntegralOrEnumerationType() && Var->getType().getCVRQualifiers() == Qualifiers::Const) { if (const Expr *Init = Var->getAnyInitializer()) if (Init->isValueDependent()) ExprBits.ValueDependent = true; } // (VD) - FIXME: Missing from the standard: // - a member function or a static data member of the current // instantiation else if (Var->isStaticDataMember() && Var->getDeclContext()->isDependentContext()) ExprBits.ValueDependent = true; } // (VD) - FIXME: Missing from the standard: // - a member function or a static data member of the current // instantiation else if (isa(D) && D->getDeclContext()->isDependentContext()) ExprBits.ValueDependent = true; // (TD) - a nested-name-specifier or a qualified-id that names a // member of an unknown specialization. // (handled by DependentScopeDeclRefExpr) } DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, ValueDecl *D, SourceLocation NameLoc, const TemplateArgumentListInfo *TemplateArgs, QualType T, ExprValueKind VK) : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false), DecoratedD(D, (Qualifier? HasQualifierFlag : 0) | (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), Loc(NameLoc) { if (Qualifier) { NameQualifier *NQ = getNameQualifier(); NQ->NNS = Qualifier; NQ->Range = QualifierRange; } if (TemplateArgs) getExplicitTemplateArgs().initializeFrom(*TemplateArgs); computeDependence(); } DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, ValueDecl *D, const DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *TemplateArgs, QualType T, ExprValueKind VK) : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false), DecoratedD(D, (Qualifier? HasQualifierFlag : 0) | (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { if (Qualifier) { NameQualifier *NQ = getNameQualifier(); NQ->NNS = Qualifier; NQ->Range = QualifierRange; } if (TemplateArgs) getExplicitTemplateArgs().initializeFrom(*TemplateArgs); computeDependence(); } DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, NestedNameSpecifier *Qualifier, SourceRange QualifierRange, ValueDecl *D, SourceLocation NameLoc, QualType T, ExprValueKind VK, const TemplateArgumentListInfo *TemplateArgs) { return Create(Context, Qualifier, QualifierRange, D, DeclarationNameInfo(D->getDeclName(), NameLoc), T, VK, TemplateArgs); } DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, NestedNameSpecifier *Qualifier, SourceRange QualifierRange, ValueDecl *D, const DeclarationNameInfo &NameInfo, QualType T, ExprValueKind VK, const TemplateArgumentListInfo *TemplateArgs) { std::size_t Size = sizeof(DeclRefExpr); if (Qualifier != 0) Size += sizeof(NameQualifier); if (TemplateArgs) Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); void *Mem = Context.Allocate(Size, llvm::alignOf()); return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, TemplateArgs, T, VK); } DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, bool HasQualifier, unsigned NumTemplateArgs) { std::size_t Size = sizeof(DeclRefExpr); if (HasQualifier) Size += sizeof(NameQualifier); if (NumTemplateArgs) Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); void *Mem = Context.Allocate(Size, llvm::alignOf()); return new (Mem) DeclRefExpr(EmptyShell()); } SourceRange DeclRefExpr::getSourceRange() const { SourceRange R = getNameInfo().getSourceRange(); if (hasQualifier()) R.setBegin(getQualifierRange().getBegin()); if (hasExplicitTemplateArgs()) R.setEnd(getRAngleLoc()); return R; } // FIXME: Maybe this should use DeclPrinter with a special "print predefined // expr" policy instead. std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { ASTContext &Context = CurrentDecl->getASTContext(); if (const FunctionDecl *FD = dyn_cast(CurrentDecl)) { if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) return FD->getNameAsString(); llvm::SmallString<256> Name; llvm::raw_svector_ostream Out(Name); if (const CXXMethodDecl *MD = dyn_cast(FD)) { if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) Out << "virtual "; if (MD->isStatic()) Out << "static "; } PrintingPolicy Policy(Context.getLangOptions()); std::string Proto = FD->getQualifiedNameAsString(Policy); const FunctionType *AFT = FD->getType()->getAs(); const FunctionProtoType *FT = 0; if (FD->hasWrittenPrototype()) FT = dyn_cast(AFT); Proto += "("; if (FT) { llvm::raw_string_ostream POut(Proto); for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { if (i) POut << ", "; std::string Param; FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); POut << Param; } if (FT->isVariadic()) { if (FD->getNumParams()) POut << ", "; POut << "..."; } } Proto += ")"; if (const CXXMethodDecl *MD = dyn_cast(FD)) { Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); if (ThisQuals.hasConst()) Proto += " const"; if (ThisQuals.hasVolatile()) Proto += " volatile"; } if (!isa(FD) && !isa(FD)) AFT->getResultType().getAsStringInternal(Proto, Policy); Out << Proto; Out.flush(); return Name.str().str(); } if (const ObjCMethodDecl *MD = dyn_cast(CurrentDecl)) { llvm::SmallString<256> Name; llvm::raw_svector_ostream Out(Name); Out << (MD->isInstanceMethod() ? '-' : '+'); Out << '['; // For incorrect code, there might not be an ObjCInterfaceDecl. Do // a null check to avoid a crash. if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) Out << ID; if (const ObjCCategoryImplDecl *CID = dyn_cast(MD->getDeclContext())) Out << '(' << CID << ')'; Out << ' '; Out << MD->getSelector().getAsString(); Out << ']'; Out.flush(); return Name.str().str(); } if (isa(CurrentDecl) && IT == PrettyFunction) { // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. return "top level"; } return ""; } void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { if (hasAllocation()) C.Deallocate(pVal); BitWidth = Val.getBitWidth(); unsigned NumWords = Val.getNumWords(); const uint64_t* Words = Val.getRawData(); if (NumWords > 1) { pVal = new (C) uint64_t[NumWords]; std::copy(Words, Words + NumWords, pVal); } else if (NumWords == 1) VAL = Words[0]; else VAL = 0; } IntegerLiteral * IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l) { return new (C) IntegerLiteral(C, V, type, l); } IntegerLiteral * IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { return new (C) IntegerLiteral(Empty); } FloatingLiteral * FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, bool isexact, QualType Type, SourceLocation L) { return new (C) FloatingLiteral(C, V, isexact, Type, L); } FloatingLiteral * FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { return new (C) FloatingLiteral(Empty); } /// getValueAsApproximateDouble - This returns the value as an inaccurate /// double. Note that this may cause loss of precision, but is useful for /// debugging dumps, etc. double FloatingLiteral::getValueAsApproximateDouble() const { llvm::APFloat V = getValue(); bool ignored; V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, &ignored); return V.convertToDouble(); } StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, unsigned ByteLength, bool Wide, QualType Ty, const SourceLocation *Loc, unsigned NumStrs) { // Allocate enough space for the StringLiteral plus an array of locations for // any concatenated string tokens. void *Mem = C.Allocate(sizeof(StringLiteral)+ sizeof(SourceLocation)*(NumStrs-1), llvm::alignOf()); StringLiteral *SL = new (Mem) StringLiteral(Ty); // OPTIMIZE: could allocate this appended to the StringLiteral. char *AStrData = new (C, 1) char[ByteLength]; memcpy(AStrData, StrData, ByteLength); SL->StrData = AStrData; SL->ByteLength = ByteLength; SL->IsWide = Wide; SL->TokLocs[0] = Loc[0]; SL->NumConcatenated = NumStrs; if (NumStrs != 1) memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); return SL; } StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { void *Mem = C.Allocate(sizeof(StringLiteral)+ sizeof(SourceLocation)*(NumStrs-1), llvm::alignOf()); StringLiteral *SL = new (Mem) StringLiteral(QualType()); SL->StrData = 0; SL->ByteLength = 0; SL->NumConcatenated = NumStrs; return SL; } void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { char *AStrData = new (C, 1) char[Str.size()]; memcpy(AStrData, Str.data(), Str.size()); StrData = AStrData; ByteLength = Str.size(); } /// getLocationOfByte - Return a source location that points to the specified /// byte of this string literal. /// /// Strings are amazingly complex. They can be formed from multiple tokens and /// can have escape sequences in them in addition to the usual trigraph and /// escaped newline business. This routine handles this complexity. /// SourceLocation StringLiteral:: getLocationOfByte(unsigned ByteNo, const SourceManager &SM, const LangOptions &Features, const TargetInfo &Target) const { assert(!isWide() && "This doesn't work for wide strings yet"); // Loop over all of the tokens in this string until we find the one that // contains the byte we're looking for. unsigned TokNo = 0; while (1) { assert(TokNo < getNumConcatenated() && "Invalid byte number!"); SourceLocation StrTokLoc = getStrTokenLoc(TokNo); // Get the spelling of the string so that we can get the data that makes up // the string literal, not the identifier for the macro it is potentially // expanded through. SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); // Re-lex the token to get its length and original spelling. std::pair LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); bool Invalid = false; llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); if (Invalid) return StrTokSpellingLoc; const char *StrData = Buffer.data()+LocInfo.second; // Create a langops struct and enable trigraphs. This is sufficient for // relexing tokens. LangOptions LangOpts; LangOpts.Trigraphs = true; // Create a lexer starting at the beginning of this token. Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, Buffer.end()); Token TheTok; TheLexer.LexFromRawLexer(TheTok); // Use the StringLiteralParser to compute the length of the string in bytes. StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); unsigned TokNumBytes = SLP.GetStringLength(); // If the byte is in this token, return the location of the byte. if (ByteNo < TokNumBytes || (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); // Now that we know the offset of the token in the spelling, use the // preprocessor to get the offset in the original source. return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); } // Move to the next string token. ++TokNo; ByteNo -= TokNumBytes; } } /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it /// corresponds to, e.g. "sizeof" or "[pre]++". const char *UnaryOperator::getOpcodeStr(Opcode Op) { switch (Op) { default: assert(0 && "Unknown unary operator"); case UO_PostInc: return "++"; case UO_PostDec: return "--"; case UO_PreInc: return "++"; case UO_PreDec: return "--"; case UO_AddrOf: return "&"; case UO_Deref: return "*"; case UO_Plus: return "+"; case UO_Minus: return "-"; case UO_Not: return "~"; case UO_LNot: return "!"; case UO_Real: return "__real"; case UO_Imag: return "__imag"; case UO_Extension: return "__extension__"; } } UnaryOperatorKind UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { switch (OO) { default: assert(false && "No unary operator for overloaded function"); case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; case OO_Amp: return UO_AddrOf; case OO_Star: return UO_Deref; case OO_Plus: return UO_Plus; case OO_Minus: return UO_Minus; case OO_Tilde: return UO_Not; case OO_Exclaim: return UO_LNot; } } OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { switch (Opc) { case UO_PostInc: case UO_PreInc: return OO_PlusPlus; case UO_PostDec: case UO_PreDec: return OO_MinusMinus; case UO_AddrOf: return OO_Amp; case UO_Deref: return OO_Star; case UO_Plus: return OO_Plus; case UO_Minus: return OO_Minus; case UO_Not: return OO_Tilde; case UO_LNot: return OO_Exclaim; default: return OO_None; } } //===----------------------------------------------------------------------===// // Postfix Operators. //===----------------------------------------------------------------------===// CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, QualType t, ExprValueKind VK, SourceLocation rparenloc) : Expr(SC, t, VK, OK_Ordinary, fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), NumArgs(numargs) { SubExprs = new (C) Stmt*[numargs+1]; SubExprs[FN] = fn; for (unsigned i = 0; i != numargs; ++i) SubExprs[i+ARGS_START] = args[i]; RParenLoc = rparenloc; } CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, ExprValueKind VK, SourceLocation rparenloc) : Expr(CallExprClass, t, VK, OK_Ordinary, fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), NumArgs(numargs) { SubExprs = new (C) Stmt*[numargs+1]; SubExprs[FN] = fn; for (unsigned i = 0; i != numargs; ++i) SubExprs[i+ARGS_START] = args[i]; RParenLoc = rparenloc; } CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) : Expr(SC, Empty), SubExprs(0), NumArgs(0) { SubExprs = new (C) Stmt*[1]; } Decl *CallExpr::getCalleeDecl() { Expr *CEE = getCallee()->IgnoreParenCasts(); // If we're calling a dereference, look at the pointer instead. if (BinaryOperator *BO = dyn_cast(CEE)) { if (BO->isPtrMemOp()) CEE = BO->getRHS()->IgnoreParenCasts(); } else if (UnaryOperator *UO = dyn_cast(CEE)) { if (UO->getOpcode() == UO_Deref) CEE = UO->getSubExpr()->IgnoreParenCasts(); } if (DeclRefExpr *DRE = dyn_cast(CEE)) return DRE->getDecl(); if (MemberExpr *ME = dyn_cast(CEE)) return ME->getMemberDecl(); return 0; } FunctionDecl *CallExpr::getDirectCallee() { return dyn_cast_or_null(getCalleeDecl()); } /// setNumArgs - This changes the number of arguments present in this call. /// Any orphaned expressions are deleted by this, and any new operands are set /// to null. void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { // No change, just return. if (NumArgs == getNumArgs()) return; // If shrinking # arguments, just delete the extras and forgot them. if (NumArgs < getNumArgs()) { this->NumArgs = NumArgs; return; } // Otherwise, we are growing the # arguments. New an bigger argument array. Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; // Copy over args. for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) NewSubExprs[i] = SubExprs[i]; // Null out new args. for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) NewSubExprs[i] = 0; if (SubExprs) C.Deallocate(SubExprs); SubExprs = NewSubExprs; this->NumArgs = NumArgs; } /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If /// not, return 0. unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { // All simple function calls (e.g. func()) are implicitly cast to pointer to // function. As a result, we try and obtain the DeclRefExpr from the // ImplicitCastExpr. const ImplicitCastExpr *ICE = dyn_cast(getCallee()); if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). return 0; const DeclRefExpr *DRE = dyn_cast(ICE->getSubExpr()); if (!DRE) return 0; const FunctionDecl *FDecl = dyn_cast(DRE->getDecl()); if (!FDecl) return 0; if (!FDecl->getIdentifier()) return 0; return FDecl->getBuiltinID(); } QualType CallExpr::getCallReturnType() const { QualType CalleeType = getCallee()->getType(); if (const PointerType *FnTypePtr = CalleeType->getAs()) CalleeType = FnTypePtr->getPointeeType(); else if (const BlockPointerType *BPT = CalleeType->getAs()) CalleeType = BPT->getPointeeType(); else if (const MemberPointerType *MPT = CalleeType->getAs()) CalleeType = MPT->getPointeeType(); const FunctionType *FnType = CalleeType->getAs(); return FnType->getResultType(); } OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, SourceLocation OperatorLoc, TypeSourceInfo *tsi, OffsetOfNode* compsPtr, unsigned numComps, Expr** exprsPtr, unsigned numExprs, SourceLocation RParenLoc) { void *Mem = C.Allocate(sizeof(OffsetOfExpr) + sizeof(OffsetOfNode) * numComps + sizeof(Expr*) * numExprs); return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, exprsPtr, numExprs, RParenLoc); } OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, unsigned numComps, unsigned numExprs) { void *Mem = C.Allocate(sizeof(OffsetOfExpr) + sizeof(OffsetOfNode) * numComps + sizeof(Expr*) * numExprs); return new (Mem) OffsetOfExpr(numComps, numExprs); } OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, SourceLocation OperatorLoc, TypeSourceInfo *tsi, OffsetOfNode* compsPtr, unsigned numComps, Expr** exprsPtr, unsigned numExprs, SourceLocation RParenLoc) : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, /*TypeDependent=*/false, /*ValueDependent=*/tsi->getType()->isDependentType() || hasAnyTypeDependentArguments(exprsPtr, numExprs) || hasAnyValueDependentArguments(exprsPtr, numExprs)), OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), NumComps(numComps), NumExprs(numExprs) { for(unsigned i = 0; i < numComps; ++i) { setComponent(i, compsPtr[i]); } for(unsigned i = 0; i < numExprs; ++i) { setIndexExpr(i, exprsPtr[i]); } } IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { assert(getKind() == Field || getKind() == Identifier); if (getKind() == Field) return getField()->getIdentifier(); return reinterpret_cast (Data & ~(uintptr_t)Mask); } MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, NestedNameSpecifier *qual, SourceRange qualrange, ValueDecl *memberdecl, DeclAccessPair founddecl, DeclarationNameInfo nameinfo, const TemplateArgumentListInfo *targs, QualType ty, ExprValueKind vk, ExprObjectKind ok) { std::size_t Size = sizeof(MemberExpr); bool hasQualOrFound = (qual != 0 || founddecl.getDecl() != memberdecl || founddecl.getAccess() != memberdecl->getAccess()); if (hasQualOrFound) Size += sizeof(MemberNameQualifier); if (targs) Size += ExplicitTemplateArgumentList::sizeFor(*targs); void *Mem = C.Allocate(Size, llvm::alignOf()); MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, ty, vk, ok); if (hasQualOrFound) { if (qual && qual->isDependent()) { E->setValueDependent(true); E->setTypeDependent(true); } E->HasQualifierOrFoundDecl = true; MemberNameQualifier *NQ = E->getMemberQualifier(); NQ->NNS = qual; NQ->Range = qualrange; NQ->FoundDecl = founddecl; } if (targs) { E->HasExplicitTemplateArgumentList = true; E->getExplicitTemplateArgs().initializeFrom(*targs); } return E; } const char *CastExpr::getCastKindName() const { switch (getCastKind()) { case CK_Dependent: return "Dependent"; case CK_BitCast: return "BitCast"; case CK_LValueBitCast: return "LValueBitCast"; case CK_NoOp: return "NoOp"; case CK_BaseToDerived: return "BaseToDerived"; case CK_DerivedToBase: return "DerivedToBase"; case CK_UncheckedDerivedToBase: return "UncheckedDerivedToBase"; case CK_Dynamic: return "Dynamic"; case CK_ToUnion: return "ToUnion"; case CK_ArrayToPointerDecay: return "ArrayToPointerDecay"; case CK_FunctionToPointerDecay: return "FunctionToPointerDecay"; case CK_NullToMemberPointer: return "NullToMemberPointer"; case CK_NullToPointer: return "NullToPointer"; case CK_BaseToDerivedMemberPointer: return "BaseToDerivedMemberPointer"; case CK_DerivedToBaseMemberPointer: return "DerivedToBaseMemberPointer"; case CK_UserDefinedConversion: return "UserDefinedConversion"; case CK_ConstructorConversion: return "ConstructorConversion"; case CK_IntegralToPointer: return "IntegralToPointer"; case CK_PointerToIntegral: return "PointerToIntegral"; case CK_PointerToBoolean: return "PointerToBoolean"; case CK_ToVoid: return "ToVoid"; case CK_VectorSplat: return "VectorSplat"; case CK_IntegralCast: return "IntegralCast"; case CK_IntegralToBoolean: return "IntegralToBoolean"; case CK_IntegralToFloating: return "IntegralToFloating"; case CK_FloatingToIntegral: return "FloatingToIntegral"; case CK_FloatingCast: return "FloatingCast"; case CK_FloatingToBoolean: return "FloatingToBoolean"; case CK_MemberPointerToBoolean: return "MemberPointerToBoolean"; case CK_AnyPointerToObjCPointerCast: return "AnyPointerToObjCPointerCast"; case CK_AnyPointerToBlockPointerCast: return "AnyPointerToBlockPointerCast"; case CK_ObjCObjectLValueCast: return "ObjCObjectLValueCast"; case CK_FloatingRealToComplex: return "FloatingRealToComplex"; case CK_FloatingComplexToReal: return "FloatingComplexToReal"; case CK_FloatingComplexToBoolean: return "FloatingComplexToBoolean"; case CK_FloatingComplexCast: return "FloatingComplexCast"; case CK_FloatingComplexToIntegralComplex: return "FloatingComplexToIntegralComplex"; case CK_IntegralRealToComplex: return "IntegralRealToComplex"; case CK_IntegralComplexToReal: return "IntegralComplexToReal"; case CK_IntegralComplexToBoolean: return "IntegralComplexToBoolean"; case CK_IntegralComplexCast: return "IntegralComplexCast"; case CK_IntegralComplexToFloatingComplex: return "IntegralComplexToFloatingComplex"; } llvm_unreachable("Unhandled cast kind!"); return 0; } Expr *CastExpr::getSubExprAsWritten() { Expr *SubExpr = 0; CastExpr *E = this; do { SubExpr = E->getSubExpr(); // Skip any temporary bindings; they're implicit. if (CXXBindTemporaryExpr *Binder = dyn_cast(SubExpr)) SubExpr = Binder->getSubExpr(); // Conversions by constructor and conversion functions have a // subexpression describing the call; strip it off. if (E->getCastKind() == CK_ConstructorConversion) SubExpr = cast(SubExpr)->getArg(0); else if (E->getCastKind() == CK_UserDefinedConversion) SubExpr = cast(SubExpr)->getImplicitObjectArgument(); // If the subexpression we're left with is an implicit cast, look // through that, too. } while ((E = dyn_cast(SubExpr))); return SubExpr; } CXXBaseSpecifier **CastExpr::path_buffer() { switch (getStmtClass()) { #define ABSTRACT_STMT(x) #define CASTEXPR(Type, Base) \ case Stmt::Type##Class: \ return reinterpret_cast(static_cast(this)+1); #define STMT(Type, Base) #include "clang/AST/StmtNodes.inc" default: llvm_unreachable("non-cast expressions not possible here"); return 0; } } void CastExpr::setCastPath(const CXXCastPath &Path) { assert(Path.size() == path_size()); memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); } ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind VK) { unsigned PathSize = (BasePath ? BasePath->size() : 0); void *Buffer = C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); ImplicitCastExpr *E = new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); if (PathSize) E->setCastPath(*BasePath); return E; } ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { void *Buffer = C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); } CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, ExprValueKind VK, CastKind K, Expr *Op, const CXXCastPath *BasePath, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation R) { unsigned PathSize = (BasePath ? BasePath->size() : 0); void *Buffer = C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); CStyleCastExpr *E = new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); if (PathSize) E->setCastPath(*BasePath); return E; } CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { void *Buffer = C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); } /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it /// corresponds to, e.g. "<<=". const char *BinaryOperator::getOpcodeStr(Opcode Op) { switch (Op) { case BO_PtrMemD: return ".*"; case BO_PtrMemI: return "->*"; case BO_Mul: return "*"; case BO_Div: return "/"; case BO_Rem: return "%"; case BO_Add: return "+"; case BO_Sub: return "-"; case BO_Shl: return "<<"; case BO_Shr: return ">>"; case BO_LT: return "<"; case BO_GT: return ">"; case BO_LE: return "<="; case BO_GE: return ">="; case BO_EQ: return "=="; case BO_NE: return "!="; case BO_And: return "&"; case BO_Xor: return "^"; case BO_Or: return "|"; case BO_LAnd: return "&&"; case BO_LOr: return "||"; case BO_Assign: return "="; case BO_MulAssign: return "*="; case BO_DivAssign: return "/="; case BO_RemAssign: return "%="; case BO_AddAssign: return "+="; case BO_SubAssign: return "-="; case BO_ShlAssign: return "<<="; case BO_ShrAssign: return ">>="; case BO_AndAssign: return "&="; case BO_XorAssign: return "^="; case BO_OrAssign: return "|="; case BO_Comma: return ","; } return ""; } BinaryOperatorKind BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { switch (OO) { default: assert(false && "Not an overloadable binary operator"); case OO_Plus: return BO_Add; case OO_Minus: return BO_Sub; case OO_Star: return BO_Mul; case OO_Slash: return BO_Div; case OO_Percent: return BO_Rem; case OO_Caret: return BO_Xor; case OO_Amp: return BO_And; case OO_Pipe: return BO_Or; case OO_Equal: return BO_Assign; case OO_Less: return BO_LT; case OO_Greater: return BO_GT; case OO_PlusEqual: return BO_AddAssign; case OO_MinusEqual: return BO_SubAssign; case OO_StarEqual: return BO_MulAssign; case OO_SlashEqual: return BO_DivAssign; case OO_PercentEqual: return BO_RemAssign; case OO_CaretEqual: return BO_XorAssign; case OO_AmpEqual: return BO_AndAssign; case OO_PipeEqual: return BO_OrAssign; case OO_LessLess: return BO_Shl; case OO_GreaterGreater: return BO_Shr; case OO_LessLessEqual: return BO_ShlAssign; case OO_GreaterGreaterEqual: return BO_ShrAssign; case OO_EqualEqual: return BO_EQ; case OO_ExclaimEqual: return BO_NE; case OO_LessEqual: return BO_LE; case OO_GreaterEqual: return BO_GE; case OO_AmpAmp: return BO_LAnd; case OO_PipePipe: return BO_LOr; case OO_Comma: return BO_Comma; case OO_ArrowStar: return BO_PtrMemI; } } OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { static const OverloadedOperatorKind OverOps[] = { /* .* Cannot be overloaded */OO_None, OO_ArrowStar, OO_Star, OO_Slash, OO_Percent, OO_Plus, OO_Minus, OO_LessLess, OO_GreaterGreater, OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, OO_EqualEqual, OO_ExclaimEqual, OO_Amp, OO_Caret, OO_Pipe, OO_AmpAmp, OO_PipePipe, OO_Equal, OO_StarEqual, OO_SlashEqual, OO_PercentEqual, OO_PlusEqual, OO_MinusEqual, OO_LessLessEqual, OO_GreaterGreaterEqual, OO_AmpEqual, OO_CaretEqual, OO_PipeEqual, OO_Comma }; return OverOps[Opc]; } InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, Expr **initExprs, unsigned numInits, SourceLocation rbraceloc) : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false), InitExprs(C, numInits), LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), UnionFieldInit(0), HadArrayRangeDesignator(false) { for (unsigned I = 0; I != numInits; ++I) { if (initExprs[I]->isTypeDependent()) ExprBits.TypeDependent = true; if (initExprs[I]->isValueDependent()) ExprBits.ValueDependent = true; } InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); } void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { if (NumInits > InitExprs.size()) InitExprs.reserve(C, NumInits); } void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { InitExprs.resize(C, NumInits, 0); } Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { if (Init >= InitExprs.size()) { InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); InitExprs.back() = expr; return 0; } Expr *Result = cast_or_null(InitExprs[Init]); InitExprs[Init] = expr; return Result; } SourceRange InitListExpr::getSourceRange() const { if (SyntacticForm) return SyntacticForm->getSourceRange(); SourceLocation Beg = LBraceLoc, End = RBraceLoc; if (Beg.isInvalid()) { // Find the first non-null initializer. for (InitExprsTy::const_iterator I = InitExprs.begin(), E = InitExprs.end(); I != E; ++I) { if (Stmt *S = *I) { Beg = S->getLocStart(); break; } } } if (End.isInvalid()) { // Find the first non-null initializer from the end. for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), E = InitExprs.rend(); I != E; ++I) { if (Stmt *S = *I) { End = S->getSourceRange().getEnd(); break; } } } return SourceRange(Beg, End); } /// getFunctionType - Return the underlying function type for this block. /// const FunctionType *BlockExpr::getFunctionType() const { return getType()->getAs()-> getPointeeType()->getAs(); } SourceLocation BlockExpr::getCaretLocation() const { return TheBlock->getCaretLocation(); } const Stmt *BlockExpr::getBody() const { return TheBlock->getBody(); } Stmt *BlockExpr::getBody() { return TheBlock->getBody(); } //===----------------------------------------------------------------------===// // Generic Expression Routines //===----------------------------------------------------------------------===// /// isUnusedResultAWarning - Return true if this immediate expression should /// be warned about if the result is unused. If so, fill in Loc and Ranges /// with location to warn on and the source range[s] to report with the /// warning. bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, SourceRange &R2, ASTContext &Ctx) const { // Don't warn if the expr is type dependent. The type could end up // instantiating to void. if (isTypeDependent()) return false; switch (getStmtClass()) { default: if (getType()->isVoidType()) return false; Loc = getExprLoc(); R1 = getSourceRange(); return true; case ParenExprClass: return cast(this)->getSubExpr()-> isUnusedResultAWarning(Loc, R1, R2, Ctx); case UnaryOperatorClass: { const UnaryOperator *UO = cast(this); switch (UO->getOpcode()) { default: break; case UO_PostInc: case UO_PostDec: case UO_PreInc: case UO_PreDec: // ++/-- return false; // Not a warning. case UO_Deref: // Dereferencing a volatile pointer is a side-effect. if (Ctx.getCanonicalType(getType()).isVolatileQualified()) return false; break; case UO_Real: case UO_Imag: // accessing a piece of a volatile complex is a side-effect. if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) .isVolatileQualified()) return false; break; case UO_Extension: return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); } Loc = UO->getOperatorLoc(); R1 = UO->getSubExpr()->getSourceRange(); return true; } case BinaryOperatorClass: { const BinaryOperator *BO = cast(this); switch (BO->getOpcode()) { default: break; // Consider the RHS of comma for side effects. LHS was checked by // Sema::CheckCommaOperands. case BO_Comma: // ((foo = ), 0) is an idiom for hiding the result (and // lvalue-ness) of an assignment written in a macro. if (IntegerLiteral *IE = dyn_cast(BO->getRHS()->IgnoreParens())) if (IE->getValue() == 0) return false; return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); // Consider '||', '&&' to have side effects if the LHS or RHS does. case BO_LAnd: case BO_LOr: if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) return false; break; } if (BO->isAssignmentOp()) return false; Loc = BO->getOperatorLoc(); R1 = BO->getLHS()->getSourceRange(); R2 = BO->getRHS()->getSourceRange(); return true; } case CompoundAssignOperatorClass: case VAArgExprClass: return false; case ConditionalOperatorClass: { // The condition must be evaluated, but if either the LHS or RHS is a // warning, warn about them. const ConditionalOperator *Exp = cast(this); if (Exp->getLHS() && Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) return true; return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); } case MemberExprClass: // If the base pointer or element is to a volatile pointer/field, accessing // it is a side effect. if (Ctx.getCanonicalType(getType()).isVolatileQualified()) return false; Loc = cast(this)->getMemberLoc(); R1 = SourceRange(Loc, Loc); R2 = cast(this)->getBase()->getSourceRange(); return true; case ArraySubscriptExprClass: // If the base pointer or element is to a volatile pointer/field, accessing // it is a side effect. if (Ctx.getCanonicalType(getType()).isVolatileQualified()) return false; Loc = cast(this)->getRBracketLoc(); R1 = cast(this)->getLHS()->getSourceRange(); R2 = cast(this)->getRHS()->getSourceRange(); return true; case CallExprClass: case CXXOperatorCallExprClass: case CXXMemberCallExprClass: { // If this is a direct call, get the callee. const CallExpr *CE = cast(this); if (const Decl *FD = CE->getCalleeDecl()) { // If the callee has attribute pure, const, or warn_unused_result, warn // about it. void foo() { strlen("bar"); } should warn. // // Note: If new cases are added here, DiagnoseUnusedExprResult should be // updated to match for QoI. if (FD->getAttr() || FD->getAttr() || FD->getAttr()) { Loc = CE->getCallee()->getLocStart(); R1 = CE->getCallee()->getSourceRange(); if (unsigned NumArgs = CE->getNumArgs()) R2 = SourceRange(CE->getArg(0)->getLocStart(), CE->getArg(NumArgs-1)->getLocEnd()); return true; } } return false; } case CXXTemporaryObjectExprClass: case CXXConstructExprClass: return false; case ObjCMessageExprClass: { const ObjCMessageExpr *ME = cast(this); const ObjCMethodDecl *MD = ME->getMethodDecl(); if (MD && MD->getAttr()) { Loc = getExprLoc(); return true; } return false; } case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. #if 0 const ObjCImplicitSetterGetterRefExpr *Ref = cast(this); // FIXME: We really want the location of the '.' here. Loc = Ref->getLocation(); R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); if (Ref->getBase()) R2 = Ref->getBase()->getSourceRange(); #else Loc = getExprLoc(); R1 = getSourceRange(); #endif return true; } case StmtExprClass: { // Statement exprs don't logically have side effects themselves, but are // sometimes used in macros in ways that give them a type that is unused. // For example ({ blah; foo(); }) will end up with a type if foo has a type. // however, if the result of the stmt expr is dead, we don't want to emit a // warning. const CompoundStmt *CS = cast(this)->getSubStmt(); if (!CS->body_empty()) { if (const Expr *E = dyn_cast(CS->body_back())) return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); if (const LabelStmt *Label = dyn_cast(CS->body_back())) if (const Expr *E = dyn_cast(Label->getSubStmt())) return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); } if (getType()->isVoidType()) return false; Loc = cast(this)->getLParenLoc(); R1 = getSourceRange(); return true; } case CStyleCastExprClass: // If this is an explicit cast to void, allow it. People do this when they // think they know what they're doing :). if (getType()->isVoidType()) return false; Loc = cast(this)->getLParenLoc(); R1 = cast(this)->getSubExpr()->getSourceRange(); return true; case CXXFunctionalCastExprClass: { if (getType()->isVoidType()) return false; const CastExpr *CE = cast(this); // If this is a cast to void or a constructor conversion, check the operand. // Otherwise, the result of the cast is unused. if (CE->getCastKind() == CK_ToVoid || CE->getCastKind() == CK_ConstructorConversion) return (cast(this)->getSubExpr() ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); Loc = cast(this)->getTypeBeginLoc(); R1 = cast(this)->getSubExpr()->getSourceRange(); return true; } case ImplicitCastExprClass: // Check the operand, since implicit casts are inserted by Sema return (cast(this) ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); case CXXDefaultArgExprClass: return (cast(this) ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); case CXXNewExprClass: // FIXME: In theory, there might be new expressions that don't have side // effects (e.g. a placement new with an uninitialized POD). case CXXDeleteExprClass: return false; case CXXBindTemporaryExprClass: return (cast(this) ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); case CXXExprWithTemporariesClass: return (cast(this) ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); } } /// isOBJCGCCandidate - Check if an expression is objc gc'able. /// returns true, if it is; false otherwise. bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { switch (getStmtClass()) { default: return false; case ObjCIvarRefExprClass: return true; case Expr::UnaryOperatorClass: return cast(this)->getSubExpr()->isOBJCGCCandidate(Ctx); case ParenExprClass: return cast(this)->getSubExpr()->isOBJCGCCandidate(Ctx); case ImplicitCastExprClass: return cast(this)->getSubExpr()->isOBJCGCCandidate(Ctx); case CStyleCastExprClass: return cast(this)->getSubExpr()->isOBJCGCCandidate(Ctx); case DeclRefExprClass: { const Decl *D = cast(this)->getDecl(); if (const VarDecl *VD = dyn_cast(D)) { if (VD->hasGlobalStorage()) return true; QualType T = VD->getType(); // dereferencing to a pointer is always a gc'able candidate, // unless it is __weak. return T->isPointerType() && (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); } return false; } case MemberExprClass: { const MemberExpr *M = cast(this); return M->getBase()->isOBJCGCCandidate(Ctx); } case ArraySubscriptExprClass: return cast(this)->getBase()->isOBJCGCCandidate(Ctx); } } bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { if (isTypeDependent()) return false; return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; } static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, Expr::CanThrowResult CT2) { // CanThrowResult constants are ordered so that the maximum is the correct // merge result. return CT1 > CT2 ? CT1 : CT2; } static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { Expr *E = const_cast(CE); Expr::CanThrowResult R = Expr::CT_Cannot; for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); I != IE && R != Expr::CT_Can; ++I) { R = MergeCanThrow(R, cast(*I)->CanThrow(C)); } return R; } static Expr::CanThrowResult CanCalleeThrow(const Decl *D, bool NullThrows = true) { if (!D) return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; // See if we can get a function type from the decl somehow. const ValueDecl *VD = dyn_cast(D); if (!VD) // If we have no clue what we're calling, assume the worst. return Expr::CT_Can; // As an extension, we assume that __attribute__((nothrow)) functions don't // throw. if (isa(D) && D->hasAttr()) return Expr::CT_Cannot; QualType T = VD->getType(); const FunctionProtoType *FT; if ((FT = T->getAs())) { } else if (const PointerType *PT = T->getAs()) FT = PT->getPointeeType()->getAs(); else if (const ReferenceType *RT = T->getAs()) FT = RT->getPointeeType()->getAs(); else if (const MemberPointerType *MT = T->getAs()) FT = MT->getPointeeType()->getAs(); else if (const BlockPointerType *BT = T->getAs()) FT = BT->getPointeeType()->getAs(); if (!FT) return Expr::CT_Can; return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; } static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { if (DC->isTypeDependent()) return Expr::CT_Dependent; if (!DC->getTypeAsWritten()->isReferenceType()) return Expr::CT_Cannot; return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; } static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, const CXXTypeidExpr *DC) { if (DC->isTypeOperand()) return Expr::CT_Cannot; Expr *Op = DC->getExprOperand(); if (Op->isTypeDependent()) return Expr::CT_Dependent; const RecordType *RT = Op->getType()->getAs(); if (!RT) return Expr::CT_Cannot; if (!cast(RT->getDecl())->isPolymorphic()) return Expr::CT_Cannot; if (Op->Classify(C).isPRValue()) return Expr::CT_Cannot; return Expr::CT_Can; } Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { // C++ [expr.unary.noexcept]p3: // [Can throw] if in a potentially-evaluated context the expression would // contain: switch (getStmtClass()) { case CXXThrowExprClass: // - a potentially evaluated throw-expression return CT_Can; case CXXDynamicCastExprClass: { // - a potentially evaluated dynamic_cast expression dynamic_cast(v), // where T is a reference type, that requires a run-time check CanThrowResult CT = CanDynamicCastThrow(cast(this)); if (CT == CT_Can) return CT; return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } case CXXTypeidExprClass: // - a potentially evaluated typeid expression applied to a glvalue // expression whose type is a polymorphic class type return CanTypeidThrow(C, cast(this)); // - a potentially evaluated call to a function, member function, function // pointer, or member function pointer that does not have a non-throwing // exception-specification case CallExprClass: case CXXOperatorCallExprClass: case CXXMemberCallExprClass: { CanThrowResult CT = CanCalleeThrow(cast(this)->getCalleeDecl()); if (CT == CT_Can) return CT; return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } case CXXConstructExprClass: case CXXTemporaryObjectExprClass: { CanThrowResult CT = CanCalleeThrow( cast(this)->getConstructor()); if (CT == CT_Can) return CT; return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } case CXXNewExprClass: { CanThrowResult CT = MergeCanThrow( CanCalleeThrow(cast(this)->getOperatorNew()), CanCalleeThrow(cast(this)->getConstructor(), /*NullThrows*/false)); if (CT == CT_Can) return CT; return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } case CXXDeleteExprClass: { CanThrowResult CT = CanCalleeThrow( cast(this)->getOperatorDelete()); if (CT == CT_Can) return CT; const Expr *Arg = cast(this)->getArgument(); // Unwrap exactly one implicit cast, which converts all pointers to void*. if (const ImplicitCastExpr *Cast = dyn_cast(Arg)) Arg = Cast->getSubExpr(); if (const PointerType *PT = Arg->getType()->getAs()) { if (const RecordType *RT = PT->getPointeeType()->getAs()) { CanThrowResult CT2 = CanCalleeThrow( cast(RT->getDecl())->getDestructor()); if (CT2 == CT_Can) return CT2; CT = MergeCanThrow(CT, CT2); } } return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } case CXXBindTemporaryExprClass: { // The bound temporary has to be destroyed again, which might throw. CanThrowResult CT = CanCalleeThrow( cast(this)->getTemporary()->getDestructor()); if (CT == CT_Can) return CT; return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } // ObjC message sends are like function calls, but never have exception // specs. case ObjCMessageExprClass: case ObjCPropertyRefExprClass: case ObjCImplicitSetterGetterRefExprClass: return CT_Can; // Many other things have subexpressions, so we have to test those. // Some are simple: case ParenExprClass: case MemberExprClass: case CXXReinterpretCastExprClass: case CXXConstCastExprClass: case ConditionalOperatorClass: case CompoundLiteralExprClass: case ExtVectorElementExprClass: case InitListExprClass: case DesignatedInitExprClass: case ParenListExprClass: case VAArgExprClass: case CXXDefaultArgExprClass: case CXXExprWithTemporariesClass: case ObjCIvarRefExprClass: case ObjCIsaExprClass: case ShuffleVectorExprClass: return CanSubExprsThrow(C, this); // Some might be dependent for other reasons. case UnaryOperatorClass: case ArraySubscriptExprClass: case ImplicitCastExprClass: case CStyleCastExprClass: case CXXStaticCastExprClass: case CXXFunctionalCastExprClass: case BinaryOperatorClass: case CompoundAssignOperatorClass: { CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; return MergeCanThrow(CT, CanSubExprsThrow(C, this)); } // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. case StmtExprClass: return CT_Can; case ChooseExprClass: if (isTypeDependent() || isValueDependent()) return CT_Dependent; return cast(this)->getChosenSubExpr(C)->CanThrow(C); // Some expressions are always dependent. case DependentScopeDeclRefExprClass: case CXXUnresolvedConstructExprClass: case CXXDependentScopeMemberExprClass: return CT_Dependent; default: // All other expressions don't have subexpressions, or else they are // unevaluated. return CT_Cannot; } } Expr* Expr::IgnoreParens() { Expr* E = this; while (true) { if (ParenExpr* P = dyn_cast(E)) { E = P->getSubExpr(); continue; } if (UnaryOperator* P = dyn_cast(E)) { if (P->getOpcode() == UO_Extension) { E = P->getSubExpr(); continue; } } return E; } } /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr /// or CastExprs or ImplicitCastExprs, returning their operand. Expr *Expr::IgnoreParenCasts() { Expr *E = this; while (true) { if (ParenExpr* P = dyn_cast(E)) { E = P->getSubExpr(); continue; } if (CastExpr *P = dyn_cast(E)) { E = P->getSubExpr(); continue; } if (UnaryOperator* P = dyn_cast(E)) { if (P->getOpcode() == UO_Extension) { E = P->getSubExpr(); continue; } } return E; } } Expr *Expr::IgnoreParenImpCasts() { Expr *E = this; while (true) { if (ParenExpr *P = dyn_cast(E)) { E = P->getSubExpr(); continue; } if (ImplicitCastExpr *P = dyn_cast(E)) { E = P->getSubExpr(); continue; } if (UnaryOperator* P = dyn_cast(E)) { if (P->getOpcode() == UO_Extension) { E = P->getSubExpr(); continue; } } return E; } } /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the /// value (including ptr->int casts of the same size). Strip off any /// ParenExpr or CastExprs, returning their operand. Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { Expr *E = this; while (true) { if (ParenExpr *P = dyn_cast(E)) { E = P->getSubExpr(); continue; } if (CastExpr *P = dyn_cast(E)) { // We ignore integer <-> casts that are of the same width, ptr<->ptr and // ptr<->int casts of the same width. We also ignore all identity casts. Expr *SE = P->getSubExpr(); if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { E = SE; continue; } if ((E->getType()->isPointerType() || E->getType()->isIntegralType(Ctx)) && (SE->getType()->isPointerType() || SE->getType()->isIntegralType(Ctx)) && Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { E = SE; continue; } } if (UnaryOperator* P = dyn_cast(E)) { if (P->getOpcode() == UO_Extension) { E = P->getSubExpr(); continue; } } return E; } } bool Expr::isDefaultArgument() const { const Expr *E = this; while (const ImplicitCastExpr *ICE = dyn_cast(E)) E = ICE->getSubExprAsWritten(); return isa(E); } /// \brief Skip over any no-op casts and any temporary-binding /// expressions. static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { while (const ImplicitCastExpr *ICE = dyn_cast(E)) { if (ICE->getCastKind() == CK_NoOp) E = ICE->getSubExpr(); else break; } while (const CXXBindTemporaryExpr *BE = dyn_cast(E)) E = BE->getSubExpr(); while (const ImplicitCastExpr *ICE = dyn_cast(E)) { if (ICE->getCastKind() == CK_NoOp) E = ICE->getSubExpr(); else break; } return E->IgnoreParens(); } /// isTemporaryObject - Determines if this expression produces a /// temporary of the given class type. bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) return false; const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); // Temporaries are by definition pr-values of class type. if (!E->Classify(C).isPRValue()) { // In this context, property reference is a message call and is pr-value. if (!isa(E) && !isa(E)) return false; } // Black-list a few cases which yield pr-values of class type that don't // refer to temporaries of that type: // - implicit derived-to-base conversions if (isa(E)) { switch (cast(E)->getCastKind()) { case CK_DerivedToBase: case CK_UncheckedDerivedToBase: return false; default: break; } } // - member expressions (all) if (isa(E)) return false; return true; } /// hasAnyTypeDependentArguments - Determines if any of the expressions /// in Exprs is type-dependent. bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { for (unsigned I = 0; I < NumExprs; ++I) if (Exprs[I]->isTypeDependent()) return true; return false; } /// hasAnyValueDependentArguments - Determines if any of the expressions /// in Exprs is value-dependent. bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { for (unsigned I = 0; I < NumExprs; ++I) if (Exprs[I]->isValueDependent()) return true; return false; } bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { // This function is attempting whether an expression is an initializer // which can be evaluated at compile-time. isEvaluatable handles most // of the cases, but it can't deal with some initializer-specific // expressions, and it can't deal with aggregates; we deal with those here, // and fall back to isEvaluatable for the other cases. // If we ever capture reference-binding directly in the AST, we can // kill the second parameter. if (IsForRef) { EvalResult Result; return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; } switch (getStmtClass()) { default: break; case StringLiteralClass: case ObjCStringLiteralClass: case ObjCEncodeExprClass: return true; case CXXTemporaryObjectExprClass: case CXXConstructExprClass: { const CXXConstructExpr *CE = cast(this); // Only if it's // 1) an application of the trivial default constructor or if (!CE->getConstructor()->isTrivial()) return false; if (!CE->getNumArgs()) return true; // 2) an elidable trivial copy construction of an operand which is // itself a constant initializer. Note that we consider the // operand on its own, *not* as a reference binding. return CE->isElidable() && CE->getArg(0)->isConstantInitializer(Ctx, false); } case CompoundLiteralExprClass: { // This handles gcc's extension that allows global initializers like // "struct x {int x;} x = (struct x) {};". // FIXME: This accepts other cases it shouldn't! const Expr *Exp = cast(this)->getInitializer(); return Exp->isConstantInitializer(Ctx, false); } case InitListExprClass: { // FIXME: This doesn't deal with fields with reference types correctly. // FIXME: This incorrectly allows pointers cast to integers to be assigned // to bitfields. const InitListExpr *Exp = cast(this); unsigned numInits = Exp->getNumInits(); for (unsigned i = 0; i < numInits; i++) { if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) return false; } return true; } case ImplicitValueInitExprClass: return true; case ParenExprClass: return cast(this)->getSubExpr() ->isConstantInitializer(Ctx, IsForRef); case ChooseExprClass: return cast(this)->getChosenSubExpr(Ctx) ->isConstantInitializer(Ctx, IsForRef); case UnaryOperatorClass: { const UnaryOperator* Exp = cast(this); if (Exp->getOpcode() == UO_Extension) return Exp->getSubExpr()->isConstantInitializer(Ctx, false); break; } case BinaryOperatorClass: { // Special case &&foo - &&bar. It would be nice to generalize this somehow // but this handles the common case. const BinaryOperator *Exp = cast(this); if (Exp->getOpcode() == BO_Sub && isa(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && isa(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) return true; break; } case CXXFunctionalCastExprClass: case CXXStaticCastExprClass: case ImplicitCastExprClass: case CStyleCastExprClass: // Handle casts with a destination that's a struct or union; this // deals with both the gcc no-op struct cast extension and the // cast-to-union extension. if (getType()->isRecordType()) return cast(this)->getSubExpr() ->isConstantInitializer(Ctx, false); // Integer->integer casts can be handled here, which is important for // things like (int)(&&x-&&y). Scary but true. if (getType()->isIntegerType() && cast(this)->getSubExpr()->getType()->isIntegerType()) return cast(this)->getSubExpr() ->isConstantInitializer(Ctx, false); break; } return isEvaluatable(Ctx); } /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an /// integer constant expression with the value zero, or if this is one that is /// cast to void*. bool Expr::isNullPointerConstant(ASTContext &Ctx, NullPointerConstantValueDependence NPC) const { if (isValueDependent()) { switch (NPC) { case NPC_NeverValueDependent: assert(false && "Unexpected value dependent expression!"); // If the unthinkable happens, fall through to the safest alternative. case NPC_ValueDependentIsNull: return isTypeDependent() || getType()->isIntegralType(Ctx); case NPC_ValueDependentIsNotNull: return false; } } // Strip off a cast to void*, if it exists. Except in C++. if (const ExplicitCastExpr *CE = dyn_cast(this)) { if (!Ctx.getLangOptions().CPlusPlus) { // Check that it is a cast to void*. if (const PointerType *PT = CE->getType()->getAs()) { QualType Pointee = PT->getPointeeType(); if (!Pointee.hasQualifiers() && Pointee->isVoidType() && // to void* CE->getSubExpr()->getType()->isIntegerType()) // from int. return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); } } } else if (const ImplicitCastExpr *ICE = dyn_cast(this)) { // Ignore the ImplicitCastExpr type entirely. return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); } else if (const ParenExpr *PE = dyn_cast(this)) { // Accept ((void*)0) as a null pointer constant, as many other // implementations do. return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); } else if (const CXXDefaultArgExpr *DefaultArg = dyn_cast(this)) { // See through default argument expressions return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); } else if (isa(this)) { // The GNU __null extension is always a null pointer constant. return true; } // C++0x nullptr_t is always a null pointer constant. if (getType()->isNullPtrType()) return true; if (const RecordType *UT = getType()->getAsUnionType()) if (UT && UT->getDecl()->hasAttr()) if (const CompoundLiteralExpr *CLE = dyn_cast(this)){ const Expr *InitExpr = CLE->getInitializer(); if (const InitListExpr *ILE = dyn_cast(InitExpr)) return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); } // This expression must be an integer type. if (!getType()->isIntegerType() || (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) return false; // If we have an integer constant expression, we need to *evaluate* it and // test for the value 0. llvm::APSInt Result; return isIntegerConstantExpr(Result, Ctx) && Result == 0; } FieldDecl *Expr::getBitField() { Expr *E = this->IgnoreParens(); while (ImplicitCastExpr *ICE = dyn_cast(E)) { if (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp) E = ICE->getSubExpr()->IgnoreParens(); else break; } if (MemberExpr *MemRef = dyn_cast(E)) if (FieldDecl *Field = dyn_cast(MemRef->getMemberDecl())) if (Field->isBitField()) return Field; if (DeclRefExpr *DeclRef = dyn_cast(E)) if (FieldDecl *Field = dyn_cast(DeclRef->getDecl())) if (Field->isBitField()) return Field; if (BinaryOperator *BinOp = dyn_cast(E)) if (BinOp->isAssignmentOp() && BinOp->getLHS()) return BinOp->getLHS()->getBitField(); return 0; } bool Expr::refersToVectorElement() const { const Expr *E = this->IgnoreParens(); while (const ImplicitCastExpr *ICE = dyn_cast(E)) { if (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp) E = ICE->getSubExpr()->IgnoreParens(); else break; } if (const ArraySubscriptExpr *ASE = dyn_cast(E)) return ASE->getBase()->getType()->isVectorType(); if (isa(E)) return true; return false; } /// isArrow - Return true if the base expression is a pointer to vector, /// return false if the base expression is a vector. bool ExtVectorElementExpr::isArrow() const { return getBase()->getType()->isPointerType(); } unsigned ExtVectorElementExpr::getNumElements() const { if (const VectorType *VT = getType()->getAs()) return VT->getNumElements(); return 1; } /// containsDuplicateElements - Return true if any element access is repeated. bool ExtVectorElementExpr::containsDuplicateElements() const { // FIXME: Refactor this code to an accessor on the AST node which returns the // "type" of component access, and share with code below and in Sema. llvm::StringRef Comp = Accessor->getName(); // Halving swizzles do not contain duplicate elements. if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") return false; // Advance past s-char prefix on hex swizzles. if (Comp[0] == 's' || Comp[0] == 'S') Comp = Comp.substr(1); for (unsigned i = 0, e = Comp.size(); i != e; ++i) if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) return true; return false; } /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. void ExtVectorElementExpr::getEncodedElementAccess( llvm::SmallVectorImpl &Elts) const { llvm::StringRef Comp = Accessor->getName(); if (Comp[0] == 's' || Comp[0] == 'S') Comp = Comp.substr(1); bool isHi = Comp == "hi"; bool isLo = Comp == "lo"; bool isEven = Comp == "even"; bool isOdd = Comp == "odd"; for (unsigned i = 0, e = getNumElements(); i != e; ++i) { uint64_t Index; if (isHi) Index = e + i; else if (isLo) Index = i; else if (isEven) Index = 2 * i; else if (isOdd) Index = 2 * i + 1; else Index = ExtVectorType::getAccessorIdx(Comp[i]); Elts.push_back(Index); } } ObjCMessageExpr::ObjCMessageExpr(QualType T, ExprValueKind VK, SourceLocation LBracLoc, SourceLocation SuperLoc, bool IsInstanceSuper, QualType SuperType, Selector Sel, ObjCMethodDecl *Method, Expr **Args, unsigned NumArgs, SourceLocation RBracLoc) : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, /*TypeDependent=*/false, /*ValueDependent=*/false), NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), HasMethod(Method != 0), SuperLoc(SuperLoc), SelectorOrMethod(reinterpret_cast(Method? Method : Sel.getAsOpaquePtr())), LBracLoc(LBracLoc), RBracLoc(RBracLoc) { setReceiverPointer(SuperType.getAsOpaquePtr()); if (NumArgs) memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); } ObjCMessageExpr::ObjCMessageExpr(QualType T, ExprValueKind VK, SourceLocation LBracLoc, TypeSourceInfo *Receiver, Selector Sel, ObjCMethodDecl *Method, Expr **Args, unsigned NumArgs, SourceLocation RBracLoc) : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), (T->isDependentType() || hasAnyValueDependentArguments(Args, NumArgs))), NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), SelectorOrMethod(reinterpret_cast(Method? Method : Sel.getAsOpaquePtr())), LBracLoc(LBracLoc), RBracLoc(RBracLoc) { setReceiverPointer(Receiver); if (NumArgs) memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); } ObjCMessageExpr::ObjCMessageExpr(QualType T, ExprValueKind VK, SourceLocation LBracLoc, Expr *Receiver, Selector Sel, ObjCMethodDecl *Method, Expr **Args, unsigned NumArgs, SourceLocation RBracLoc) : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), (Receiver->isTypeDependent() || hasAnyValueDependentArguments(Args, NumArgs))), NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), SelectorOrMethod(reinterpret_cast(Method? Method : Sel.getAsOpaquePtr())), LBracLoc(LBracLoc), RBracLoc(RBracLoc) { setReceiverPointer(Receiver); if (NumArgs) memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); } ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, ExprValueKind VK, SourceLocation LBracLoc, SourceLocation SuperLoc, bool IsInstanceSuper, QualType SuperType, Selector Sel, ObjCMethodDecl *Method, Expr **Args, unsigned NumArgs, SourceLocation RBracLoc) { unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + NumArgs * sizeof(Expr *); void *Mem = Context.Allocate(Size, llvm::AlignOf::Alignment); return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, SuperType, Sel, Method, Args, NumArgs, RBracLoc); } ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, ExprValueKind VK, SourceLocation LBracLoc, TypeSourceInfo *Receiver, Selector Sel, ObjCMethodDecl *Method, Expr **Args, unsigned NumArgs, SourceLocation RBracLoc) { unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + NumArgs * sizeof(Expr *); void *Mem = Context.Allocate(Size, llvm::AlignOf::Alignment); return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, Method, Args, NumArgs, RBracLoc); } ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, ExprValueKind VK, SourceLocation LBracLoc, Expr *Receiver, Selector Sel, ObjCMethodDecl *Method, Expr **Args, unsigned NumArgs, SourceLocation RBracLoc) { unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + NumArgs * sizeof(Expr *); void *Mem = Context.Allocate(Size, llvm::AlignOf::Alignment); return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, Method, Args, NumArgs, RBracLoc); } ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, unsigned NumArgs) { unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + NumArgs * sizeof(Expr *); void *Mem = Context.Allocate(Size, llvm::AlignOf::Alignment); return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); } Selector ObjCMessageExpr::getSelector() const { if (HasMethod) return reinterpret_cast(SelectorOrMethod) ->getSelector(); return Selector(SelectorOrMethod); } ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { switch (getReceiverKind()) { case Instance: if (const ObjCObjectPointerType *Ptr = getInstanceReceiver()->getType()->getAs()) return Ptr->getInterfaceDecl(); break; case Class: if (const ObjCObjectType *Ty = getClassReceiver()->getAs()) return Ty->getInterface(); break; case SuperInstance: if (const ObjCObjectPointerType *Ptr = getSuperType()->getAs()) return Ptr->getInterfaceDecl(); break; case SuperClass: if (const ObjCObjectPointerType *Iface = getSuperType()->getAs()) return Iface->getInterfaceDecl(); break; } return 0; } bool ChooseExpr::isConditionTrue(ASTContext &C) const { return getCond()->EvaluateAsInt(C) != 0; } void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs) { if (SubExprs) C.Deallocate(SubExprs); SubExprs = new (C) Stmt* [NumExprs]; this->NumExprs = NumExprs; memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); } //===----------------------------------------------------------------------===// // DesignatedInitExpr //===----------------------------------------------------------------------===// IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { assert(Kind == FieldDesignator && "Only valid on a field designator"); if (Field.NameOrField & 0x01) return reinterpret_cast(Field.NameOrField&~0x01); else return getField()->getIdentifier(); } DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, const Designator *Designators, SourceLocation EqualOrColonLoc, bool GNUSyntax, Expr **IndexExprs, unsigned NumIndexExprs, Expr *Init) : Expr(DesignatedInitExprClass, Ty, Init->getValueKind(), Init->getObjectKind(), Init->isTypeDependent(), Init->isValueDependent()), EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { this->Designators = new (C) Designator[NumDesignators]; // Record the initializer itself. child_iterator Child = child_begin(); *Child++ = Init; // Copy the designators and their subexpressions, computing // value-dependence along the way. unsigned IndexIdx = 0; for (unsigned I = 0; I != NumDesignators; ++I) { this->Designators[I] = Designators[I]; if (this->Designators[I].isArrayDesignator()) { // Compute type- and value-dependence. Expr *Index = IndexExprs[IndexIdx]; ExprBits.ValueDependent = ExprBits.ValueDependent || Index->isTypeDependent() || Index->isValueDependent(); // Copy the index expressions into permanent storage. *Child++ = IndexExprs[IndexIdx++]; } else if (this->Designators[I].isArrayRangeDesignator()) { // Compute type- and value-dependence. Expr *Start = IndexExprs[IndexIdx]; Expr *End = IndexExprs[IndexIdx + 1]; ExprBits.ValueDependent = ExprBits.ValueDependent || Start->isTypeDependent() || Start->isValueDependent() || End->isTypeDependent() || End->isValueDependent(); // Copy the start/end expressions into permanent storage. *Child++ = IndexExprs[IndexIdx++]; *Child++ = IndexExprs[IndexIdx++]; } } assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); } DesignatedInitExpr * DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, unsigned NumDesignators, Expr **IndexExprs, unsigned NumIndexExprs, SourceLocation ColonOrEqualLoc, bool UsesColonSyntax, Expr *Init) { void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + sizeof(Stmt *) * (NumIndexExprs + 1), 8); return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, ColonOrEqualLoc, UsesColonSyntax, IndexExprs, NumIndexExprs, Init); } DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, unsigned NumIndexExprs) { void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + sizeof(Stmt *) * (NumIndexExprs + 1), 8); return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); } void DesignatedInitExpr::setDesignators(ASTContext &C, const Designator *Desigs, unsigned NumDesigs) { Designators = new (C) Designator[NumDesigs]; NumDesignators = NumDesigs; for (unsigned I = 0; I != NumDesigs; ++I) Designators[I] = Desigs[I]; } SourceRange DesignatedInitExpr::getSourceRange() const { SourceLocation StartLoc; Designator &First = *const_cast(this)->designators_begin(); if (First.isFieldDesignator()) { if (GNUSyntax) StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); else StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); } else StartLoc = SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); } Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); char* Ptr = static_cast(static_cast(this)); Ptr += sizeof(DesignatedInitExpr); Stmt **SubExprs = reinterpret_cast(reinterpret_cast(Ptr)); return cast(*(SubExprs + D.ArrayOrRange.Index + 1)); } Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { assert(D.Kind == Designator::ArrayRangeDesignator && "Requires array range designator"); char* Ptr = static_cast(static_cast(this)); Ptr += sizeof(DesignatedInitExpr); Stmt **SubExprs = reinterpret_cast(reinterpret_cast(Ptr)); return cast(*(SubExprs + D.ArrayOrRange.Index + 1)); } Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { assert(D.Kind == Designator::ArrayRangeDesignator && "Requires array range designator"); char* Ptr = static_cast(static_cast(this)); Ptr += sizeof(DesignatedInitExpr); Stmt **SubExprs = reinterpret_cast(reinterpret_cast(Ptr)); return cast(*(SubExprs + D.ArrayOrRange.Index + 2)); } /// \brief Replaces the designator at index @p Idx with the series /// of designators in [First, Last). void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, const Designator *Last) { unsigned NumNewDesignators = Last - First; if (NumNewDesignators == 0) { std::copy_backward(Designators + Idx + 1, Designators + NumDesignators, Designators + Idx); --NumNewDesignators; return; } else if (NumNewDesignators == 1) { Designators[Idx] = *First; return; } Designator *NewDesignators = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; std::copy(Designators, Designators + Idx, NewDesignators); std::copy(First, Last, NewDesignators + Idx); std::copy(Designators + Idx + 1, Designators + NumDesignators, NewDesignators + Idx + NumNewDesignators); Designators = NewDesignators; NumDesignators = NumDesignators - 1 + NumNewDesignators; } ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, unsigned nexprs, SourceLocation rparenloc) : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, hasAnyTypeDependentArguments(exprs, nexprs), hasAnyValueDependentArguments(exprs, nexprs)), NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { Exprs = new (C) Stmt*[nexprs]; for (unsigned i = 0; i != nexprs; ++i) Exprs[i] = exprs[i]; } //===----------------------------------------------------------------------===// // ExprIterator. //===----------------------------------------------------------------------===// Expr* ExprIterator::operator[](size_t idx) { return cast(I[idx]); } Expr* ExprIterator::operator*() const { return cast(*I); } Expr* ExprIterator::operator->() const { return cast(*I); } const Expr* ConstExprIterator::operator[](size_t idx) const { return cast(I[idx]); } const Expr* ConstExprIterator::operator*() const { return cast(*I); } const Expr* ConstExprIterator::operator->() const { return cast(*I); } //===----------------------------------------------------------------------===// // Child Iterators for iterating over subexpressions/substatements //===----------------------------------------------------------------------===// // DeclRefExpr Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } // ObjCIvarRefExpr Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } // ObjCPropertyRefExpr Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { if (BaseExprOrSuperType.is()) { // Hack alert! return reinterpret_cast (&BaseExprOrSuperType); } return child_iterator(); } Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return BaseExprOrSuperType.is() ? reinterpret_cast (&BaseExprOrSuperType)+1 : child_iterator(); } // ObjCImplicitSetterGetterRefExpr Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { // If this is accessing a class member or super, skip that entry. // Technically, 2nd condition is sufficient. But I want to be verbose if (isSuperReceiver() || !Base) return child_iterator(); return &Base; } Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { if (isSuperReceiver() || !Base) return child_iterator(); return &Base+1; } // ObjCIsaExpr Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } // PredefinedExpr Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } // IntegerLiteral Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } // CharacterLiteral Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } // FloatingLiteral Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } // ImaginaryLiteral Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } // StringLiteral Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } // ParenExpr Stmt::child_iterator ParenExpr::child_begin() { return &Val; } Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } // UnaryOperator Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } // OffsetOfExpr Stmt::child_iterator OffsetOfExpr::child_begin() { return reinterpret_cast (reinterpret_cast (this + 1) + NumComps); } Stmt::child_iterator OffsetOfExpr::child_end() { return child_iterator(&*child_begin() + NumExprs); } // SizeOfAlignOfExpr Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { // If this is of a type and the type is a VLA type (and not a typedef), the // size expression of the VLA needs to be treated as an executable expression. // Why isn't this weirdness documented better in StmtIterator? if (isArgumentType()) { if (VariableArrayType* T = dyn_cast( getArgumentType().getTypePtr())) return child_iterator(T); return child_iterator(); } return child_iterator(&Argument.Ex); } Stmt::child_iterator SizeOfAlignOfExpr::child_end() { if (isArgumentType()) return child_iterator(); return child_iterator(&Argument.Ex + 1); } // ArraySubscriptExpr Stmt::child_iterator ArraySubscriptExpr::child_begin() { return &SubExprs[0]; } Stmt::child_iterator ArraySubscriptExpr::child_end() { return &SubExprs[0]+END_EXPR; } // CallExpr Stmt::child_iterator CallExpr::child_begin() { return &SubExprs[0]; } Stmt::child_iterator CallExpr::child_end() { return &SubExprs[0]+NumArgs+ARGS_START; } // MemberExpr Stmt::child_iterator MemberExpr::child_begin() { return &Base; } Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } // ExtVectorElementExpr Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } // CompoundLiteralExpr Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } // CastExpr Stmt::child_iterator CastExpr::child_begin() { return &Op; } Stmt::child_iterator CastExpr::child_end() { return &Op+1; } // BinaryOperator Stmt::child_iterator BinaryOperator::child_begin() { return &SubExprs[0]; } Stmt::child_iterator BinaryOperator::child_end() { return &SubExprs[0]+END_EXPR; } // ConditionalOperator Stmt::child_iterator ConditionalOperator::child_begin() { return &SubExprs[0]; } Stmt::child_iterator ConditionalOperator::child_end() { return &SubExprs[0]+END_EXPR; } // AddrLabelExpr Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } // StmtExpr Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } // TypesCompatibleExpr Stmt::child_iterator TypesCompatibleExpr::child_begin() { return child_iterator(); } Stmt::child_iterator TypesCompatibleExpr::child_end() { return child_iterator(); } // ChooseExpr Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } // GNUNullExpr Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } // ShuffleVectorExpr Stmt::child_iterator ShuffleVectorExpr::child_begin() { return &SubExprs[0]; } Stmt::child_iterator ShuffleVectorExpr::child_end() { return &SubExprs[0]+NumExprs; } // VAArgExpr Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } // InitListExpr Stmt::child_iterator InitListExpr::child_begin() { return InitExprs.size() ? &InitExprs[0] : 0; } Stmt::child_iterator InitListExpr::child_end() { return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; } // DesignatedInitExpr Stmt::child_iterator DesignatedInitExpr::child_begin() { char* Ptr = static_cast(static_cast(this)); Ptr += sizeof(DesignatedInitExpr); return reinterpret_cast(reinterpret_cast(Ptr)); } Stmt::child_iterator DesignatedInitExpr::child_end() { return child_iterator(&*child_begin() + NumSubExprs); } // ImplicitValueInitExpr Stmt::child_iterator ImplicitValueInitExpr::child_begin() { return child_iterator(); } Stmt::child_iterator ImplicitValueInitExpr::child_end() { return child_iterator(); } // ParenListExpr Stmt::child_iterator ParenListExpr::child_begin() { return &Exprs[0]; } Stmt::child_iterator ParenListExpr::child_end() { return &Exprs[0]+NumExprs; } // ObjCStringLiteral Stmt::child_iterator ObjCStringLiteral::child_begin() { return &String; } Stmt::child_iterator ObjCStringLiteral::child_end() { return &String+1; } // ObjCEncodeExpr Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } // ObjCSelectorExpr Stmt::child_iterator ObjCSelectorExpr::child_begin() { return child_iterator(); } Stmt::child_iterator ObjCSelectorExpr::child_end() { return child_iterator(); } // ObjCProtocolExpr Stmt::child_iterator ObjCProtocolExpr::child_begin() { return child_iterator(); } Stmt::child_iterator ObjCProtocolExpr::child_end() { return child_iterator(); } // ObjCMessageExpr Stmt::child_iterator ObjCMessageExpr::child_begin() { if (getReceiverKind() == Instance) return reinterpret_cast(this + 1); return getArgs(); } Stmt::child_iterator ObjCMessageExpr::child_end() { return getArgs() + getNumArgs(); } // Blocks Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } // OpaqueValueExpr SourceRange OpaqueValueExpr::getSourceRange() const { return SourceRange(); } Stmt::child_iterator OpaqueValueExpr::child_begin() { return child_iterator(); } Stmt::child_iterator OpaqueValueExpr::child_end() { return child_iterator(); }