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llvm-project/clang/lib/CodeGen/CGExprComplex.cpp

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//===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Expr nodes with complex types as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/StmtVisitor.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/ADT/SmallString.h"
using namespace clang;
using namespace CodeGen;
//===----------------------------------------------------------------------===//
// Complex Expression Emitter
//===----------------------------------------------------------------------===//
typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
namespace {
class ComplexExprEmitter
: public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
CodeGenFunction &CGF;
CGBuilderTy &Builder;
// True is we should ignore the value of a
bool IgnoreReal;
bool IgnoreImag;
public:
ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false)
: CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii) {
}
//===--------------------------------------------------------------------===//
// Utilities
//===--------------------------------------------------------------------===//
bool TestAndClearIgnoreReal() {
bool I = IgnoreReal;
IgnoreReal = false;
return I;
}
bool TestAndClearIgnoreImag() {
bool I = IgnoreImag;
IgnoreImag = false;
return I;
}
/// EmitLoadOfLValue - Given an expression with complex type that represents a
/// value l-value, this method emits the address of the l-value, then loads
/// and returns the result.
ComplexPairTy EmitLoadOfLValue(const Expr *E) {
return EmitLoadOfLValue(CGF.EmitLValue(E));
}
ComplexPairTy EmitLoadOfLValue(LValue LV) {
if (LV.isSimple())
return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
assert(LV.isPropertyRef() && "Unknown LValue type!");
return CGF.EmitLoadOfPropertyRefLValue(LV).getComplexVal();
}
/// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
/// the real and imaginary pieces.
ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
/// EmitStoreThroughLValue - Given an l-value of complex type, store
/// a complex number into it.
void EmitStoreThroughLValue(ComplexPairTy Val, LValue LV) {
if (LV.isSimple())
return EmitStoreOfComplex(Val, LV.getAddress(), LV.isVolatileQualified());
assert(LV.isPropertyRef() && "Unknown LValue type!");
CGF.EmitStoreThroughPropertyRefLValue(RValue::getComplex(Val), LV);
}
/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
QualType DestType);
//===--------------------------------------------------------------------===//
// Visitor Methods
//===--------------------------------------------------------------------===//
ComplexPairTy Visit(Expr *E) {
llvm::DenseMap<const Expr *, ComplexPairTy>::iterator I =
CGF.ConditionalSaveComplexExprs.find(E);
if (I != CGF.ConditionalSaveComplexExprs.end())
return I->second;
return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
}
ComplexPairTy VisitStmt(Stmt *S) {
S->dump(CGF.getContext().getSourceManager());
assert(0 && "Stmt can't have complex result type!");
return ComplexPairTy();
}
ComplexPairTy VisitExpr(Expr *S);
ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
// l-values.
ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
return EmitLoadOfLValue(E);
}
ComplexPairTy VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
assert(E->getObjectKind() == OK_Ordinary);
return EmitLoadOfLValue(E);
}
ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
return CGF.EmitObjCMessageExpr(E).getComplexVal();
}
ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
// FIXME: CompoundLiteralExpr
ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
// Unlike for scalars, we don't have to worry about function->ptr demotion
// here.
return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
}
ComplexPairTy VisitCastExpr(CastExpr *E) {
return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
}
ComplexPairTy VisitCallExpr(const CallExpr *E);
ComplexPairTy VisitStmtExpr(const StmtExpr *E);
// Operators.
ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
bool isInc, bool isPre) {
LValue LV = CGF.EmitLValue(E->getSubExpr());
return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
}
ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
return VisitPrePostIncDec(E, false, false);
}
ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
return VisitPrePostIncDec(E, true, false);
}
ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
return VisitPrePostIncDec(E, false, true);
}
ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
return VisitPrePostIncDec(E, true, true);
}
ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
ComplexPairTy VisitUnaryPlus (const UnaryOperator *E) {
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
return Visit(E->getSubExpr());
}
ComplexPairTy VisitUnaryMinus (const UnaryOperator *E);
ComplexPairTy VisitUnaryNot (const UnaryOperator *E);
// LNot,Real,Imag never return complex.
ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
return Visit(E->getSubExpr());
}
ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
return Visit(DAE->getExpr());
}
ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
return CGF.EmitExprWithCleanups(E).getComplexVal();
}
ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
assert(E->getType()->isAnyComplexType() && "Expected complex type!");
QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
return ComplexPairTy(Null, Null);
}
ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
assert(E->getType()->isAnyComplexType() && "Expected complex type!");
QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
llvm::Constant *Null =
llvm::Constant::getNullValue(CGF.ConvertType(Elem));
return ComplexPairTy(Null, Null);
}
struct BinOpInfo {
ComplexPairTy LHS;
ComplexPairTy RHS;
QualType Ty; // Computation Type.
};
BinOpInfo EmitBinOps(const BinaryOperator *E);
LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)
(const BinOpInfo &),
ComplexPairTy &Val);
ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)
(const BinOpInfo &));
ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
ComplexPairTy EmitBinSub(const BinOpInfo &Op);
ComplexPairTy EmitBinMul(const BinOpInfo &Op);
ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
return EmitBinAdd(EmitBinOps(E));
}
ComplexPairTy VisitBinSub(const BinaryOperator *E) {
return EmitBinSub(EmitBinOps(E));
}
ComplexPairTy VisitBinMul(const BinaryOperator *E) {
return EmitBinMul(EmitBinOps(E));
}
ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
return EmitBinDiv(EmitBinOps(E));
}
// Compound assignments.
ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
}
ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
}
ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
}
ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
}
// GCC rejects rem/and/or/xor for integer complex.
// Logical and/or always return int, never complex.
// No comparisons produce a complex result.
LValue EmitBinAssignLValue(const BinaryOperator *E,
ComplexPairTy &Val);
ComplexPairTy VisitBinAssign (const BinaryOperator *E);
ComplexPairTy VisitBinComma (const BinaryOperator *E);
ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
ComplexPairTy VisitInitListExpr(InitListExpr *E);
ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
};
} // end anonymous namespace.
//===----------------------------------------------------------------------===//
// Utilities
//===----------------------------------------------------------------------===//
/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
/// load the real and imaginary pieces, returning them as Real/Imag.
ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
bool isVolatile) {
llvm::Value *Real=0, *Imag=0;
if (!IgnoreReal || isVolatile) {
llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
SrcPtr->getName() + ".realp");
Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
}
if (!IgnoreImag || isVolatile) {
llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
SrcPtr->getName() + ".imagp");
Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
}
return ComplexPairTy(Real, Imag);
}
/// EmitStoreOfComplex - Store the specified real/imag parts into the
/// specified value pointer.
void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
bool isVolatile) {
llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
Builder.CreateStore(Val.first, RealPtr, isVolatile);
Builder.CreateStore(Val.second, ImagPtr, isVolatile);
}
//===----------------------------------------------------------------------===//
// Visitor Methods
//===----------------------------------------------------------------------===//
ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
CGF.ErrorUnsupported(E, "complex expression");
const llvm::Type *EltTy =
CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
llvm::Value *U = llvm::UndefValue::get(EltTy);
return ComplexPairTy(U, U);
}
ComplexPairTy ComplexExprEmitter::
VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
}
ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
if (E->getCallReturnType()->isReferenceType())
return EmitLoadOfLValue(E);
return CGF.EmitCallExpr(E).getComplexVal();
}
ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
CodeGenFunction::StmtExprEvaluation eval(CGF);
return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
}
/// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
QualType SrcType,
QualType DestType) {
// Get the src/dest element type.
SrcType = SrcType->getAs<ComplexType>()->getElementType();
DestType = DestType->getAs<ComplexType>()->getElementType();
// C99 6.3.1.6: When a value of complex type is converted to another
// complex type, both the real and imaginary parts follow the conversion
// rules for the corresponding real types.
Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
return Val;
}
ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
QualType DestTy) {
switch (CK) {
case CK_GetObjCProperty: {
LValue LV = CGF.EmitLValue(Op);
assert(LV.isPropertyRef() && "Unknown LValue type!");
return CGF.EmitLoadOfPropertyRefLValue(LV).getComplexVal();
}
case CK_NoOp:
case CK_LValueToRValue:
return Visit(Op);
// TODO: do all of these
default:
break;
}
// Two cases here: cast from (complex to complex) and (scalar to complex).
if (Op->getType()->isAnyComplexType())
return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
// FIXME: We should be looking at all of the cast kinds here, not
// cherry-picking the ones we have test cases for.
if (CK == CK_LValueBitCast) {
llvm::Value *V = CGF.EmitLValue(Op).getAddress();
V = Builder.CreateBitCast(V,
CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
// FIXME: Are the qualifiers correct here?
return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
}
// C99 6.3.1.7: When a value of real type is converted to a complex type, the
// real part of the complex result value is determined by the rules of
// conversion to the corresponding real type and the imaginary part of the
// complex result value is a positive zero or an unsigned zero.
llvm::Value *Elt = CGF.EmitScalarExpr(Op);
// Convert the input element to the element type of the complex.
DestTy = DestTy->getAs<ComplexType>()->getElementType();
Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
// Return (realval, 0).
return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
}
ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
ComplexPairTy Op = Visit(E->getSubExpr());
llvm::Value *ResR, *ResI;
if (Op.first->getType()->isFloatingPointTy()) {
ResR = Builder.CreateFNeg(Op.first, "neg.r");
ResI = Builder.CreateFNeg(Op.second, "neg.i");
} else {
ResR = Builder.CreateNeg(Op.first, "neg.r");
ResI = Builder.CreateNeg(Op.second, "neg.i");
}
return ComplexPairTy(ResR, ResI);
}
ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
// ~(a+ib) = a + i*-b
ComplexPairTy Op = Visit(E->getSubExpr());
llvm::Value *ResI;
if (Op.second->getType()->isFloatingPointTy())
ResI = Builder.CreateFNeg(Op.second, "conj.i");
else
ResI = Builder.CreateNeg(Op.second, "conj.i");
return ComplexPairTy(Op.first, ResI);
}
ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
llvm::Value *ResR, *ResI;
if (Op.LHS.first->getType()->isFloatingPointTy()) {
ResR = Builder.CreateFAdd(Op.LHS.first, Op.RHS.first, "add.r");
ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
} else {
ResR = Builder.CreateAdd(Op.LHS.first, Op.RHS.first, "add.r");
ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
}
return ComplexPairTy(ResR, ResI);
}
ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
llvm::Value *ResR, *ResI;
if (Op.LHS.first->getType()->isFloatingPointTy()) {
ResR = Builder.CreateFSub(Op.LHS.first, Op.RHS.first, "sub.r");
ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
} else {
ResR = Builder.CreateSub(Op.LHS.first, Op.RHS.first, "sub.r");
ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
}
return ComplexPairTy(ResR, ResI);
}
ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
using llvm::Value;
Value *ResR, *ResI;
if (Op.LHS.first->getType()->isFloatingPointTy()) {
Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
ResR = Builder.CreateFSub(ResRl, ResRr, "mul.r");
Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
ResI = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
} else {
Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
ResR = Builder.CreateSub(ResRl, ResRr, "mul.r");
Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
ResI = Builder.CreateAdd(ResIl, ResIr, "mul.i");
}
return ComplexPairTy(ResR, ResI);
}
ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
llvm::Value *DSTr, *DSTi;
if (Op.LHS.first->getType()->isFloatingPointTy()) {
// (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr, "tmp"); // a*c
llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi, "tmp"); // b*d
llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2, "tmp"); // ac+bd
llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr, "tmp"); // c*c
llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi, "tmp"); // d*d
llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5, "tmp"); // cc+dd
llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr, "tmp"); // b*c
llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi, "tmp"); // a*d
llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8, "tmp"); // bc-ad
DSTr = Builder.CreateFDiv(Tmp3, Tmp6, "tmp");
DSTi = Builder.CreateFDiv(Tmp9, Tmp6, "tmp");
} else {
// (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr, "tmp"); // a*c
llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi, "tmp"); // b*d
llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2, "tmp"); // ac+bd
llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr, "tmp"); // c*c
llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi, "tmp"); // d*d
llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5, "tmp"); // cc+dd
llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr, "tmp"); // b*c
llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi, "tmp"); // a*d
llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8, "tmp"); // bc-ad
if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
DSTr = Builder.CreateUDiv(Tmp3, Tmp6, "tmp");
DSTi = Builder.CreateUDiv(Tmp9, Tmp6, "tmp");
} else {
DSTr = Builder.CreateSDiv(Tmp3, Tmp6, "tmp");
DSTi = Builder.CreateSDiv(Tmp9, Tmp6, "tmp");
}
}
return ComplexPairTy(DSTr, DSTi);
}
ComplexExprEmitter::BinOpInfo
ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
BinOpInfo Ops;
Ops.LHS = Visit(E->getLHS());
Ops.RHS = Visit(E->getRHS());
Ops.Ty = E->getType();
return Ops;
}
LValue ComplexExprEmitter::
EmitCompoundAssignLValue(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
ComplexPairTy &Val) {
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
QualType LHSTy = E->getLHS()->getType();
BinOpInfo OpInfo;
// Load the RHS and LHS operands.
// __block variables need to have the rhs evaluated first, plus this should
// improve codegen a little.
OpInfo.Ty = E->getComputationResultType();
// The RHS should have been converted to the computation type.
assert(OpInfo.Ty->isAnyComplexType());
assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
E->getRHS()->getType()));
OpInfo.RHS = Visit(E->getRHS());
LValue LHS = CGF.EmitLValue(E->getLHS());
// Load from the l-value.
ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
// Expand the binary operator.
ComplexPairTy Result = (this->*Func)(OpInfo);
// Truncate the result back to the LHS type.
Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
Val = Result;
// Store the result value into the LHS lvalue.
EmitStoreThroughLValue(Result, LHS);
return LHS;
}
// Compound assignments.
ComplexPairTy ComplexExprEmitter::
EmitCompoundAssign(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
ComplexPairTy Val;
LValue LV = EmitCompoundAssignLValue(E, Func, Val);
// The result of an assignment in C is the assigned r-value.
if (!CGF.getContext().getLangOptions().CPlusPlus)
return Val;
// Objective-C property assignment never reloads the value following a store.
if (LV.isPropertyRef())
return Val;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LV.isVolatileQualified())
return Val;
return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
}
LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
ComplexPairTy &Val) {
assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
E->getRHS()->getType()) &&
"Invalid assignment");
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
// Emit the RHS. __block variables need the RHS evaluated first.
Val = Visit(E->getRHS());
// Compute the address to store into.
LValue LHS = CGF.EmitLValue(E->getLHS());
// Store the result value into the LHS lvalue.
EmitStoreThroughLValue(Val, LHS);
return LHS;
}
ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
ComplexPairTy Val;
LValue LV = EmitBinAssignLValue(E, Val);
// The result of an assignment in C is the assigned r-value.
if (!CGF.getContext().getLangOptions().CPlusPlus)
return Val;
// Objective-C property assignment never reloads the value following a store.
if (LV.isPropertyRef())
return Val;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LV.isVolatileQualified())
return Val;
return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
}
ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
CGF.EmitIgnoredExpr(E->getLHS());
return Visit(E->getRHS());
}
ComplexPairTy ComplexExprEmitter::
VisitConditionalOperator(const ConditionalOperator *E) {
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
CodeGenFunction::ConditionalEvaluation eval(CGF);
if (E->getLHS())
CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
else {
Expr *save = E->getSAVE();
assert(save && "VisitConditionalOperator - save is null");
// Intentionally not doing direct assignment to ConditionalSaveExprs[save] !!
ComplexPairTy SaveVal = Visit(save);
CGF.ConditionalSaveComplexExprs[save] = SaveVal;
CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
}
eval.begin(CGF);
CGF.EmitBlock(LHSBlock);
ComplexPairTy LHS = Visit(E->getTrueExpr());
LHSBlock = Builder.GetInsertBlock();
CGF.EmitBranch(ContBlock);
eval.end(CGF);
eval.begin(CGF);
CGF.EmitBlock(RHSBlock);
ComplexPairTy RHS = Visit(E->getRHS());
RHSBlock = Builder.GetInsertBlock();
CGF.EmitBlock(ContBlock);
eval.end(CGF);
// Create a PHI node for the real part.
llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
RealPN->reserveOperandSpace(2);
RealPN->addIncoming(LHS.first, LHSBlock);
RealPN->addIncoming(RHS.first, RHSBlock);
// Create a PHI node for the imaginary part.
llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
ImagPN->reserveOperandSpace(2);
ImagPN->addIncoming(LHS.second, LHSBlock);
ImagPN->addIncoming(RHS.second, RHSBlock);
return ComplexPairTy(RealPN, ImagPN);
}
ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
return Visit(E->getChosenSubExpr(CGF.getContext()));
}
ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
bool Ignore = TestAndClearIgnoreReal();
(void)Ignore;
assert (Ignore == false && "init list ignored");
Ignore = TestAndClearIgnoreImag();
(void)Ignore;
assert (Ignore == false && "init list ignored");
if (E->getNumInits())
return Visit(E->getInit(0));
// Empty init list intializes to null
QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
const llvm::Type* LTy = CGF.ConvertType(Ty);
llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
return ComplexPairTy(zeroConstant, zeroConstant);
}
ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
if (!ArgPtr) {
CGF.ErrorUnsupported(E, "complex va_arg expression");
const llvm::Type *EltTy =
CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
llvm::Value *U = llvm::UndefValue::get(EltTy);
return ComplexPairTy(U, U);
}
// FIXME Volatility.
return EmitLoadOfComplex(ArgPtr, false);
}
//===----------------------------------------------------------------------===//
// Entry Point into this File
//===----------------------------------------------------------------------===//
/// EmitComplexExpr - Emit the computation of the specified expression of
/// complex type, ignoring the result.
ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
bool IgnoreImag) {
assert(E && E->getType()->isAnyComplexType() &&
"Invalid complex expression to emit");
return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
.Visit(const_cast<Expr*>(E));
}
/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
/// of complex type, storing into the specified Value*.
void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
llvm::Value *DestAddr,
bool DestIsVolatile) {
assert(E && E->getType()->isAnyComplexType() &&
"Invalid complex expression to emit");
ComplexExprEmitter Emitter(*this);
ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
}
/// StoreComplexToAddr - Store a complex number into the specified address.
void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
llvm::Value *DestAddr,
bool DestIsVolatile) {
ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
}
/// LoadComplexFromAddr - Load a complex number from the specified address.
ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
bool SrcIsVolatile) {
return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
}
LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
assert(E->getOpcode() == BO_Assign);
ComplexPairTy Val; // ignored
return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
}
LValue CodeGenFunction::
EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
switch (E->getOpcode()) {
case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
default:
llvm_unreachable("unexpected complex compound assignment");
Op = 0;
}
ComplexPairTy Val; // ignored
return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
}
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