forked from OSchip/llvm-project
Eliminate a bunch of code which should be dead.
llvm-svn: 65267
This commit is contained in:
Eli Friedman
parent
075d642e24
commit
825fe7565e
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@ -59,9 +59,11 @@ public:
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const llvm::Type *Ty = ConvertType(E->getType());
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return EmitUnion(CGM.EmitConstantExpr(E->getSubExpr(), CGF), Ty);
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}
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llvm::Constant *C = Visit(E->getSubExpr());
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return EmitConversion(C, E->getSubExpr()->getType(), E->getType());
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if (CGM.getContext().getCanonicalType(E->getSubExpr()->getType()) ==
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CGM.getContext().getCanonicalType(E->getType())) {
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return Visit(E->getSubExpr());
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}
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return 0;
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}
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llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
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@ -341,33 +343,6 @@ public:
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return 0;
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}
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llvm::Constant *VisitImplicitCastExpr(ImplicitCastExpr *ICExpr) {
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Expr* SExpr = ICExpr->getSubExpr();
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QualType SType = SExpr->getType();
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llvm::Constant *C; // the intermediate expression
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QualType T; // the type of the intermediate expression
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if (SType->isArrayType()) {
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// Arrays decay to a pointer to the first element
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// VLAs would require special handling, but they can't occur here
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C = EmitLValue(SExpr);
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llvm::Constant *Idx0 = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
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llvm::Constant *Ops[] = {Idx0, Idx0};
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C = llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
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T = CGM.getContext().getArrayDecayedType(SType);
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} else if (SType->isFunctionType()) {
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// Function types decay to a pointer to the function
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C = EmitLValue(SExpr);
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T = CGM.getContext().getPointerType(SType);
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} else {
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C = Visit(SExpr);
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T = SType;
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}
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// Perform the conversion; note that an implicit cast can both promote
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// and convert an array/function
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return EmitConversion(C, T, ICExpr->getType());
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}
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llvm::Constant *VisitStringLiteral(StringLiteral *E) {
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assert(!E->getType()->isPointerType() && "Strings are always arrays");
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@ -381,123 +356,15 @@ public:
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return Visit(E->getSubExpr());
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}
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llvm::Constant *VisitBlockExpr(const BlockExpr *E) {
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assert (!E->hasBlockDeclRefExprs() && "global block with BlockDeclRefs");
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const char *Name = "";
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if (const NamedDecl *ND = dyn_cast<NamedDecl>(CGF->CurFuncDecl))
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Name = ND->getNameAsString().c_str();
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return CGM.GetAddrOfGlobalBlock(E, Name);
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}
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// Utility methods
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const llvm::Type *ConvertType(QualType T) {
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return CGM.getTypes().ConvertType(T);
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}
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llvm::Constant *EmitConversionToBool(llvm::Constant *Src, QualType SrcType) {
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assert(SrcType->isCanonical() && "EmitConversion strips typedefs");
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if (SrcType->isRealFloatingType()) {
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// Compare against 0.0 for fp scalars.
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llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType());
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return llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UNE, Src, Zero);
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}
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assert((SrcType->isIntegerType() || SrcType->isPointerType()) &&
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"Unknown scalar type to convert");
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// Compare against an integer or pointer null.
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llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType());
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return llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_NE, Src, Zero);
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}
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llvm::Constant *EmitConversion(llvm::Constant *Src, QualType SrcType,
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QualType DstType) {
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if (!Src)
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return 0;
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SrcType = CGM.getContext().getCanonicalType(SrcType);
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DstType = CGM.getContext().getCanonicalType(DstType);
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if (SrcType == DstType) return Src;
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// Handle conversions to bool first, they are special: comparisons against 0.
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if (DstType->isBooleanType())
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return EmitConversionToBool(Src, SrcType);
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const llvm::Type *DstTy = ConvertType(DstType);
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// Ignore conversions like int -> uint.
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if (Src->getType() == DstTy)
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return Src;
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// Handle pointer conversions next: pointers can only be converted to/from
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// other pointers and integers.
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if (isa<llvm::PointerType>(DstTy)) {
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// The source value may be an integer, or a pointer.
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if (isa<llvm::PointerType>(Src->getType()))
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return llvm::ConstantExpr::getBitCast(Src, DstTy);
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assert(SrcType->isIntegerType() &&"Not ptr->ptr or int->ptr conversion?");
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return llvm::ConstantExpr::getIntToPtr(Src, DstTy);
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}
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if (isa<llvm::PointerType>(Src->getType())) {
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// Must be an ptr to int cast.
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assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
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return llvm::ConstantExpr::getPtrToInt(Src, DstTy);
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}
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// A scalar source can be splatted to a vector of the same element type
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if (isa<llvm::VectorType>(DstTy) && !isa<VectorType>(SrcType)) {
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assert((cast<llvm::VectorType>(DstTy)->getElementType()
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== Src->getType()) &&
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"Vector element type must match scalar type to splat.");
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unsigned NumElements = DstType->getAsVectorType()->getNumElements();
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llvm::SmallVector<llvm::Constant*, 16> Elements;
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for (unsigned i = 0; i < NumElements; i++)
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Elements.push_back(Src);
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return llvm::ConstantVector::get(&Elements[0], NumElements);
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}
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if (isa<llvm::VectorType>(Src->getType()) ||
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isa<llvm::VectorType>(DstTy)) {
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return llvm::ConstantExpr::getBitCast(Src, DstTy);
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}
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// Finally, we have the arithmetic types: real int/float.
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if (isa<llvm::IntegerType>(Src->getType())) {
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bool InputSigned = SrcType->isSignedIntegerType();
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if (isa<llvm::IntegerType>(DstTy))
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return llvm::ConstantExpr::getIntegerCast(Src, DstTy, InputSigned);
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else if (InputSigned)
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return llvm::ConstantExpr::getSIToFP(Src, DstTy);
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else
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return llvm::ConstantExpr::getUIToFP(Src, DstTy);
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}
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assert(Src->getType()->isFloatingPoint() && "Unknown real conversion");
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if (isa<llvm::IntegerType>(DstTy)) {
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if (DstType->isSignedIntegerType())
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return llvm::ConstantExpr::getFPToSI(Src, DstTy);
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else
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return llvm::ConstantExpr::getFPToUI(Src, DstTy);
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}
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assert(DstTy->isFloatingPoint() && "Unknown real conversion");
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if (DstTy->getTypeID() < Src->getType()->getTypeID())
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return llvm::ConstantExpr::getFPTrunc(Src, DstTy);
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else
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return llvm::ConstantExpr::getFPExtend(Src, DstTy);
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}
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public:
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llvm::Constant *EmitLValue(Expr *E) {
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switch (E->getStmtClass()) {
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default: break;
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case Expr::ParenExprClass:
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// Elide parenthesis
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return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
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case Expr::CompoundLiteralExprClass: {
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// Note that due to the nature of compound literals, this is guaranteed
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// to be the only use of the variable, so we just generate it here.
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@ -526,37 +393,6 @@ public:
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}
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break;
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}
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case Expr::MemberExprClass: {
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MemberExpr* ME = cast<MemberExpr>(E);
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llvm::Constant *Base;
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if (ME->isArrow())
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Base = Visit(ME->getBase());
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else
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Base = EmitLValue(ME->getBase());
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if (!Base)
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return 0;
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FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl());
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// FIXME: Handle other kinds of member expressions.
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assert(Field && "No code generation for non-field member expressions");
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unsigned FieldNumber = CGM.getTypes().getLLVMFieldNo(Field);
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llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
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llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
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FieldNumber);
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llvm::Value *Ops[] = {Zero, Idx};
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return llvm::ConstantExpr::getGetElementPtr(Base, Ops, 2);
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}
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case Expr::ArraySubscriptExprClass: {
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ArraySubscriptExpr* ASExpr = cast<ArraySubscriptExpr>(E);
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assert(!ASExpr->getBase()->getType()->isVectorType() &&
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"Taking the address of a vector component is illegal!");
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llvm::Constant *Base = Visit(ASExpr->getBase());
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llvm::Constant *Index = Visit(ASExpr->getIdx());
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if (!Base || !Index)
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return 0;
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return llvm::ConstantExpr::getGetElementPtr(Base, &Index, 1);
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}
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case Expr::StringLiteralClass:
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return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E));
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case Expr::ObjCStringLiteralClass: {
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@ -566,31 +402,6 @@ public:
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llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(S);
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return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
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}
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case Expr::UnaryOperatorClass: {
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UnaryOperator *Exp = cast<UnaryOperator>(E);
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switch (Exp->getOpcode()) {
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default: break;
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case UnaryOperator::Extension:
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// Extension is just a wrapper for expressions
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return EmitLValue(Exp->getSubExpr());
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case UnaryOperator::Real:
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case UnaryOperator::Imag: {
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// The address of __real or __imag is just a GEP off the address
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// of the internal expression
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llvm::Constant* C = EmitLValue(Exp->getSubExpr());
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llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
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llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
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Exp->getOpcode() == UnaryOperator::Imag);
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llvm::Value *Ops[] = {Zero, Idx};
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return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
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}
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case UnaryOperator::Deref:
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// The address of a deref is just the value of the expression
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return Visit(Exp->getSubExpr());
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}
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break;
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}
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case Expr::PredefinedExprClass: {
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// __func__/__FUNCTION__ -> "". __PRETTY_FUNCTION__ -> "top level".
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std::string Str;
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