зеркало из https://github.com/microsoft/clang-1.git
508 строки
20 KiB
C++
508 строки
20 KiB
C++
//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Expr nodes as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "clang/AST/AST.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Support/MathExtras.h"
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using namespace clang;
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using namespace CodeGen;
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//===--------------------------------------------------------------------===//
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// Miscellaneous Helper Methods
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//===--------------------------------------------------------------------===//
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/// CreateTempAlloca - This creates a alloca and inserts it into the entry
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/// block.
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llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(const llvm::Type *Ty,
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const char *Name) {
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return new llvm::AllocaInst(Ty, 0, Name, AllocaInsertPt);
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}
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/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
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/// expression and compare the result against zero, returning an Int1Ty value.
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llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
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QualType BoolTy = getContext().BoolTy;
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if (!E->getType()->isComplexType())
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return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy);
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return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(),BoolTy);
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}
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/// EmitAnyExpr - Emit code to compute the specified expression which can have
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/// any type. The result is returned as an RValue struct. If this is an
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/// aggregate expression, the aggloc/agglocvolatile arguments indicate where
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/// the result should be returned.
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RValue CodeGenFunction::EmitAnyExpr(const Expr *E, llvm::Value *AggLoc,
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bool isAggLocVolatile) {
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if (!hasAggregateLLVMType(E->getType()))
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return RValue::get(EmitScalarExpr(E));
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else if (E->getType()->isComplexType())
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return RValue::getComplex(EmitComplexExpr(E));
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EmitAggExpr(E, AggLoc, isAggLocVolatile);
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return RValue::getAggregate(AggLoc);
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}
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//===----------------------------------------------------------------------===//
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// LValue Expression Emission
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//===----------------------------------------------------------------------===//
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/// EmitLValue - Emit code to compute a designator that specifies the location
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/// of the expression.
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///
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/// This can return one of two things: a simple address or a bitfield
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/// reference. In either case, the LLVM Value* in the LValue structure is
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/// guaranteed to be an LLVM pointer type.
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///
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/// If this returns a bitfield reference, nothing about the pointee type of
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/// the LLVM value is known: For example, it may not be a pointer to an
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/// integer.
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///
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/// If this returns a normal address, and if the lvalue's C type is fixed
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/// size, this method guarantees that the returned pointer type will point to
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/// an LLVM type of the same size of the lvalue's type. If the lvalue has a
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/// variable length type, this is not possible.
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///
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LValue CodeGenFunction::EmitLValue(const Expr *E) {
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switch (E->getStmtClass()) {
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default: {
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fprintf(stderr, "Unimplemented lvalue expr!\n");
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E->dump(getContext().SourceMgr);
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llvm::Type *Ty = llvm::PointerType::get(ConvertType(E->getType()));
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return LValue::MakeAddr(llvm::UndefValue::get(Ty));
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}
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case Expr::DeclRefExprClass: return EmitDeclRefLValue(cast<DeclRefExpr>(E));
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case Expr::ParenExprClass:return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
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case Expr::PreDefinedExprClass:
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return EmitPreDefinedLValue(cast<PreDefinedExpr>(E));
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case Expr::StringLiteralClass:
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return EmitStringLiteralLValue(cast<StringLiteral>(E));
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case Expr::UnaryOperatorClass:
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return EmitUnaryOpLValue(cast<UnaryOperator>(E));
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case Expr::ArraySubscriptExprClass:
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return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
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case Expr::OCUVectorElementExprClass:
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return EmitOCUVectorElementExpr(cast<OCUVectorElementExpr>(E));
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case Expr::MemberExprClass: return EmitMemberExpr(cast<MemberExpr>(E));
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}
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}
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/// EmitLoadOfLValue - Given an expression that represents a value lvalue,
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/// this method emits the address of the lvalue, then loads the result as an
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/// rvalue, returning the rvalue.
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RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, QualType ExprType) {
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if (LV.isSimple()) {
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llvm::Value *Ptr = LV.getAddress();
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const llvm::Type *EltTy =
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cast<llvm::PointerType>(Ptr->getType())->getElementType();
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// Simple scalar l-value.
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if (EltTy->isFirstClassType())
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return RValue::get(Builder.CreateLoad(Ptr, "tmp"));
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assert(ExprType->isFunctionType() && "Unknown scalar value");
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return RValue::get(Ptr);
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}
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if (LV.isVectorElt()) {
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llvm::Value *Vec = Builder.CreateLoad(LV.getVectorAddr(), "tmp");
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return RValue::get(Builder.CreateExtractElement(Vec, LV.getVectorIdx(),
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"vecext"));
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}
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// If this is a reference to a subset of the elements of a vector, either
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// shuffle the input or extract/insert them as appropriate.
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if (LV.isOCUVectorElt())
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return EmitLoadOfOCUElementLValue(LV, ExprType);
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assert(0 && "Bitfield ref not impl!");
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//an invalid RValue, but the assert will
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//ensure that this point is never reached
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return RValue();
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}
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// If this is a reference to a subset of the elements of a vector, either
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// shuffle the input or extract/insert them as appropriate.
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RValue CodeGenFunction::EmitLoadOfOCUElementLValue(LValue LV,
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QualType ExprType) {
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llvm::Value *Vec = Builder.CreateLoad(LV.getOCUVectorAddr(), "tmp");
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unsigned EncFields = LV.getOCUVectorElts();
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// If the result of the expression is a non-vector type, we must be
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// extracting a single element. Just codegen as an extractelement.
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const VectorType *ExprVT = ExprType->getAsVectorType();
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if (!ExprVT) {
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unsigned InIdx = OCUVectorElementExpr::getAccessedFieldNo(0, EncFields);
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llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
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return RValue::get(Builder.CreateExtractElement(Vec, Elt, "tmp"));
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}
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// If the source and destination have the same number of elements, use a
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// vector shuffle instead of insert/extracts.
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unsigned NumResultElts = ExprVT->getNumElements();
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unsigned NumSourceElts =
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cast<llvm::VectorType>(Vec->getType())->getNumElements();
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if (NumResultElts == NumSourceElts) {
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llvm::SmallVector<llvm::Constant*, 4> Mask;
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for (unsigned i = 0; i != NumResultElts; ++i) {
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unsigned InIdx = OCUVectorElementExpr::getAccessedFieldNo(i, EncFields);
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Mask.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx));
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}
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llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
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Vec = Builder.CreateShuffleVector(Vec,
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llvm::UndefValue::get(Vec->getType()),
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MaskV, "tmp");
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return RValue::get(Vec);
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}
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// Start out with an undef of the result type.
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llvm::Value *Result = llvm::UndefValue::get(ConvertType(ExprType));
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// Extract/Insert each element of the result.
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for (unsigned i = 0; i != NumResultElts; ++i) {
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unsigned InIdx = OCUVectorElementExpr::getAccessedFieldNo(i, EncFields);
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llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
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Elt = Builder.CreateExtractElement(Vec, Elt, "tmp");
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llvm::Value *OutIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, i);
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Result = Builder.CreateInsertElement(Result, Elt, OutIdx, "tmp");
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}
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return RValue::get(Result);
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}
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/// EmitStoreThroughLValue - Store the specified rvalue into the specified
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/// lvalue, where both are guaranteed to the have the same type, and that type
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/// is 'Ty'.
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void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
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QualType Ty) {
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if (!Dst.isSimple()) {
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if (Dst.isVectorElt()) {
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// Read/modify/write the vector, inserting the new element.
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// FIXME: Volatility.
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llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddr(), "tmp");
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Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
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Dst.getVectorIdx(), "vecins");
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Builder.CreateStore(Vec, Dst.getVectorAddr());
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return;
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}
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// If this is an update of elements of a vector, insert them as appropriate.
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if (Dst.isOCUVectorElt())
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return EmitStoreThroughOCUComponentLValue(Src, Dst, Ty);
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assert(0 && "FIXME: Don't support store to bitfield yet");
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}
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llvm::Value *DstAddr = Dst.getAddress();
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assert(Src.isScalar() && "Can't emit an agg store with this method");
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// FIXME: Handle volatility etc.
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const llvm::Type *SrcTy = Src.getScalarVal()->getType();
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const llvm::Type *AddrTy =
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cast<llvm::PointerType>(DstAddr->getType())->getElementType();
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if (AddrTy != SrcTy)
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DstAddr = Builder.CreateBitCast(DstAddr, llvm::PointerType::get(SrcTy),
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"storetmp");
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Builder.CreateStore(Src.getScalarVal(), DstAddr);
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}
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void CodeGenFunction::EmitStoreThroughOCUComponentLValue(RValue Src, LValue Dst,
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QualType Ty) {
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// This access turns into a read/modify/write of the vector. Load the input
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// value now.
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llvm::Value *Vec = Builder.CreateLoad(Dst.getOCUVectorAddr(), "tmp");
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// FIXME: Volatility.
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unsigned EncFields = Dst.getOCUVectorElts();
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llvm::Value *SrcVal = Src.getScalarVal();
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if (const VectorType *VTy = Ty->getAsVectorType()) {
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unsigned NumSrcElts = VTy->getNumElements();
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// Extract/Insert each element.
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for (unsigned i = 0; i != NumSrcElts; ++i) {
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llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, i);
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Elt = Builder.CreateExtractElement(SrcVal, Elt, "tmp");
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unsigned Idx = OCUVectorElementExpr::getAccessedFieldNo(i, EncFields);
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llvm::Value *OutIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, Idx);
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Vec = Builder.CreateInsertElement(Vec, Elt, OutIdx, "tmp");
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}
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} else {
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// If the Src is a scalar (not a vector) it must be updating one element.
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unsigned InIdx = OCUVectorElementExpr::getAccessedFieldNo(0, EncFields);
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llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
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Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt, "tmp");
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}
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Builder.CreateStore(Vec, Dst.getOCUVectorAddr());
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}
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LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
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const ValueDecl *D = E->getDecl();
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if (isa<BlockVarDecl>(D) || isa<ParmVarDecl>(D)) {
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llvm::Value *V = LocalDeclMap[D];
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assert(V && "BlockVarDecl not entered in LocalDeclMap?");
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return LValue::MakeAddr(V);
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} else if (isa<FunctionDecl>(D) || isa<FileVarDecl>(D)) {
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return LValue::MakeAddr(CGM.GetAddrOfGlobalDecl(D));
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}
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assert(0 && "Unimp declref");
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//an invalid LValue, but the assert will
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//ensure that this point is never reached.
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return LValue();
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}
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LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
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// __extension__ doesn't affect lvalue-ness.
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if (E->getOpcode() == UnaryOperator::Extension)
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return EmitLValue(E->getSubExpr());
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switch (E->getOpcode()) {
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default: assert(0 && "Unknown unary operator lvalue!");
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case UnaryOperator::Deref:
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return LValue::MakeAddr(EmitScalarExpr(E->getSubExpr()));
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case UnaryOperator::Real:
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case UnaryOperator::Imag:
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LValue LV = EmitLValue(E->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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E->getOpcode() == UnaryOperator::Imag);
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llvm::Value *Ops[] = {Zero, Idx};
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return LValue::MakeAddr(Builder.CreateGEP(LV.getAddress(), Ops, Ops+2,
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"idx"));
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}
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}
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LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
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assert(!E->isWide() && "FIXME: Wide strings not supported yet!");
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const char *StrData = E->getStrData();
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unsigned Len = E->getByteLength();
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// FIXME: Can cache/reuse these within the module.
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llvm::Constant *C=llvm::ConstantArray::get(std::string(StrData, StrData+Len));
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// Create a global variable for this.
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C = new llvm::GlobalVariable(C->getType(), true,
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llvm::GlobalValue::InternalLinkage,
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C, ".str", CurFn->getParent());
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llvm::Constant *Zero = llvm::Constant::getNullValue(llvm::Type::Int32Ty);
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llvm::Constant *Zeros[] = { Zero, Zero };
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C = llvm::ConstantExpr::getGetElementPtr(C, Zeros, 2);
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return LValue::MakeAddr(C);
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}
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LValue CodeGenFunction::EmitPreDefinedLValue(const PreDefinedExpr *E) {
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std::string FunctionName(CurFuncDecl->getName());
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std::string GlobalVarName;
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switch (E->getIdentType()) {
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default:
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assert(0 && "unknown pre-defined ident type");
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case PreDefinedExpr::Func:
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GlobalVarName = "__func__.";
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break;
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case PreDefinedExpr::Function:
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GlobalVarName = "__FUNCTION__.";
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break;
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case PreDefinedExpr::PrettyFunction:
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// FIXME:: Demangle C++ method names
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GlobalVarName = "__PRETTY_FUNCTION__.";
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break;
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}
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GlobalVarName += CurFuncDecl->getName();
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// FIXME: Can cache/reuse these within the module.
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llvm::Constant *C=llvm::ConstantArray::get(FunctionName);
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// Create a global variable for this.
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C = new llvm::GlobalVariable(C->getType(), true,
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llvm::GlobalValue::InternalLinkage,
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C, GlobalVarName, CurFn->getParent());
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llvm::Constant *Zero = llvm::Constant::getNullValue(llvm::Type::Int32Ty);
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llvm::Constant *Zeros[] = { Zero, Zero };
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C = llvm::ConstantExpr::getGetElementPtr(C, Zeros, 2);
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return LValue::MakeAddr(C);
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}
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LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E) {
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// The index must always be an integer, which is not an aggregate. Emit it.
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llvm::Value *Idx = EmitScalarExpr(E->getIdx());
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// If the base is a vector type, then we are forming a vector element lvalue
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// with this subscript.
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if (E->getLHS()->getType()->isVectorType()) {
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// Emit the vector as an lvalue to get its address.
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LValue LHS = EmitLValue(E->getLHS());
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assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
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// FIXME: This should properly sign/zero/extend or truncate Idx to i32.
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return LValue::MakeVectorElt(LHS.getAddress(), Idx);
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}
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// The base must be a pointer, which is not an aggregate. Emit it.
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llvm::Value *Base = EmitScalarExpr(E->getBase());
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// Extend or truncate the index type to 32 or 64-bits.
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QualType IdxTy = E->getIdx()->getType();
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bool IdxSigned = IdxTy->isSignedIntegerType();
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unsigned IdxBitwidth = cast<llvm::IntegerType>(Idx->getType())->getBitWidth();
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if (IdxBitwidth != LLVMPointerWidth)
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Idx = Builder.CreateIntCast(Idx, llvm::IntegerType::get(LLVMPointerWidth),
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IdxSigned, "idxprom");
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// We know that the pointer points to a type of the correct size, unless the
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// size is a VLA.
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if (!E->getType()->isConstantSizeType(getContext()))
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assert(0 && "VLA idx not implemented");
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return LValue::MakeAddr(Builder.CreateGEP(Base, Idx, "arrayidx"));
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}
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LValue CodeGenFunction::
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EmitOCUVectorElementExpr(const OCUVectorElementExpr *E) {
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// Emit the base vector as an l-value.
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LValue Base = EmitLValue(E->getBase());
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assert(Base.isSimple() && "Can only subscript lvalue vectors here!");
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return LValue::MakeOCUVectorElt(Base.getAddress(),
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E->getEncodedElementAccess());
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}
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LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
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Expr *BaseExpr = E->getBase();
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llvm::Value *BaseValue = NULL;
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if (BaseExpr->isLvalue() == Expr::LV_Valid) {
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LValue BaseLV = EmitLValue(BaseExpr);
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BaseValue = BaseLV.getAddress();
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if (E->isArrow()) {
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QualType PTy = cast<PointerType>(BaseExpr->getType())->getPointeeType();
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BaseValue =
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Builder.CreateBitCast(BaseValue,
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llvm::PointerType::get(ConvertType(PTy)), "tmp");
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}
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} else
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BaseValue = EmitScalarExpr(BaseExpr);
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FieldDecl *Field = E->getMemberDecl();
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unsigned idx = CGM.getTypes().getLLVMFieldNo(Field);
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llvm::Value *Idxs[2] = { llvm::Constant::getNullValue(llvm::Type::Int32Ty),
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llvm::ConstantInt::get(llvm::Type::Int32Ty, idx) };
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llvm::Value *V = Builder.CreateGEP(BaseValue,Idxs, Idxs + 2, "tmp");
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// Match union field type.
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if (BaseExpr->getType()->isUnionType()) {
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const llvm::Type * FieldTy = ConvertType(Field->getType());
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const llvm::PointerType * BaseTy =
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cast<llvm::PointerType>(BaseValue->getType());
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if (FieldTy != BaseTy->getElementType()) {
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V = Builder.CreateBitCast(V, llvm::PointerType::get(FieldTy), "tmp");
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}
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}
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return LValue::MakeAddr(V);
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// FIXME: If record field does not have one to one match with llvm::StructType
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// field then apply appropriate masks to select only member field bits.
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}
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//===--------------------------------------------------------------------===//
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// Expression Emission
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//===--------------------------------------------------------------------===//
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RValue CodeGenFunction::EmitCallExpr(const CallExpr *E) {
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if (const ImplicitCastExpr *IcExpr =
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dyn_cast<const ImplicitCastExpr>(E->getCallee()))
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if (const DeclRefExpr *DRExpr =
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dyn_cast<const DeclRefExpr>(IcExpr->getSubExpr()))
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if (const FunctionDecl *FDecl =
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dyn_cast<const FunctionDecl>(DRExpr->getDecl()))
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if (unsigned builtinID = FDecl->getIdentifier()->getBuiltinID())
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return EmitBuiltinExpr(builtinID, E);
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|
|
|
llvm::Value *Callee = EmitScalarExpr(E->getCallee());
|
|
return EmitCallExpr(Callee, E);
|
|
}
|
|
|
|
RValue CodeGenFunction::EmitCallExpr(llvm::Value *Callee, const CallExpr *E) {
|
|
// The callee type will always be a pointer to function type, get the function
|
|
// type.
|
|
QualType CalleeTy = E->getCallee()->getType();
|
|
CalleeTy = cast<PointerType>(CalleeTy.getCanonicalType())->getPointeeType();
|
|
|
|
// Get information about the argument types.
|
|
FunctionTypeProto::arg_type_iterator ArgTyIt = 0, ArgTyEnd = 0;
|
|
|
|
// Calling unprototyped functions provides no argument info.
|
|
if (const FunctionTypeProto *FTP = dyn_cast<FunctionTypeProto>(CalleeTy)) {
|
|
ArgTyIt = FTP->arg_type_begin();
|
|
ArgTyEnd = FTP->arg_type_end();
|
|
}
|
|
|
|
llvm::SmallVector<llvm::Value*, 16> Args;
|
|
|
|
// Handle struct-return functions by passing a pointer to the location that
|
|
// we would like to return into.
|
|
if (hasAggregateLLVMType(E->getType())) {
|
|
// Create a temporary alloca to hold the result of the call. :(
|
|
Args.push_back(CreateTempAlloca(ConvertType(E->getType())));
|
|
// FIXME: set the stret attribute on the argument.
|
|
}
|
|
|
|
for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) {
|
|
QualType ArgTy = E->getArg(i)->getType();
|
|
|
|
if (!hasAggregateLLVMType(ArgTy)) {
|
|
// Scalar argument is passed by-value.
|
|
Args.push_back(EmitScalarExpr(E->getArg(i)));
|
|
} else if (ArgTy->isComplexType()) {
|
|
// Make a temporary alloca to pass the argument.
|
|
llvm::Value *DestMem = CreateTempAlloca(ConvertType(ArgTy));
|
|
EmitComplexExprIntoAddr(E->getArg(i), DestMem, false);
|
|
Args.push_back(DestMem);
|
|
} else {
|
|
llvm::Value *DestMem = CreateTempAlloca(ConvertType(ArgTy));
|
|
EmitAggExpr(E->getArg(i), DestMem, false);
|
|
Args.push_back(DestMem);
|
|
}
|
|
}
|
|
|
|
llvm::Value *V = Builder.CreateCall(Callee, &Args[0], &Args[0]+Args.size());
|
|
if (V->getType() != llvm::Type::VoidTy)
|
|
V->setName("call");
|
|
else if (E->getType()->isComplexType())
|
|
return RValue::getComplex(LoadComplexFromAddr(Args[0], false));
|
|
else if (hasAggregateLLVMType(E->getType()))
|
|
// Struct return.
|
|
return RValue::getAggregate(Args[0]);
|
|
|
|
return RValue::get(V);
|
|
}
|