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2da04b3322
This patch temporarily breaks compound assignment operators, but greatly simplifies many things. llvm-svn: 41355
348 lines
13 KiB
C++
348 lines
13 KiB
C++
//===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
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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 with complex types 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/Function.h"
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#include "llvm/Support/Compiler.h"
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using namespace clang;
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using namespace CodeGen;
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//===----------------------------------------------------------------------===//
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// Complex Expression Emitter
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//===----------------------------------------------------------------------===//
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typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
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namespace {
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class VISIBILITY_HIDDEN ComplexExprEmitter
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: public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
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CodeGenFunction &CGF;
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llvm::LLVMBuilder &Builder;
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public:
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ComplexExprEmitter(CodeGenFunction &cgf) : CGF(cgf), Builder(CGF.Builder) {
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}
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//===--------------------------------------------------------------------===//
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// Utilities
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//===--------------------------------------------------------------------===//
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/// EmitLoadOfLValue - Given an expression with complex type that represents a
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/// value l-value, this method emits the address of the l-value, then loads
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/// and returns the result.
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ComplexPairTy EmitLoadOfLValue(const Expr *E) {
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LValue LV = CGF.EmitLValue(E);
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// FIXME: Volatile
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return EmitLoadOfComplex(LV.getAddress(), false);
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}
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/// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
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/// the real and imaginary pieces.
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ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
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/// EmitStoreOfComplex - Store the specified real/imag parts into the
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/// specified value pointer.
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void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
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//===--------------------------------------------------------------------===//
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// Visitor Methods
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//===--------------------------------------------------------------------===//
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ComplexPairTy VisitStmt(Stmt *S) {
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S->dump();
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assert(0 && "Stmt can't have complex result type!");
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return ComplexPairTy();
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}
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ComplexPairTy VisitExpr(Expr *S);
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ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
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// l-values.
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ComplexPairTy VisitDeclRefExpr(Expr *E) { return EmitLoadOfLValue(E); }
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ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
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ComplexPairTy VisitMemberExpr(Expr *E) { return EmitLoadOfLValue(E); }
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// FIXME: CompoundLiteralExpr
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// FIXME: ImplicitCastExpr
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ComplexPairTy VisitCallExpr(const CallExpr *E);
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// Operators.
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ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
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bool isInc, bool isPre);
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ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
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return VisitPrePostIncDec(E, false, false);
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}
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ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
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return VisitPrePostIncDec(E, true, false);
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}
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ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
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return VisitPrePostIncDec(E, false, true);
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}
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ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
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return VisitPrePostIncDec(E, true, true);
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}
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ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
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ComplexPairTy VisitUnaryPlus (const UnaryOperator *E) {
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return Visit(E->getSubExpr());
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}
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ComplexPairTy VisitUnaryMinus (const UnaryOperator *E);
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ComplexPairTy VisitUnaryNot (const UnaryOperator *E);
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// LNot,SizeOf,AlignOf,Real,Imag never return complex.
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ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
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return Visit(E->getSubExpr());
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}
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ComplexPairTy VisitBinMul (const BinaryOperator *E);
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ComplexPairTy VisitBinAdd (const BinaryOperator *E);
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ComplexPairTy VisitBinSub (const BinaryOperator *E);
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// FIXME: div/rem
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// GCC rejects and/or/xor for integer complex.
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// Logical and/or always return int, never complex.
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// No comparisons produce a complex result.
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ComplexPairTy VisitBinAssign (const BinaryOperator *E);
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// FIXME: Compound assignment operators.
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ComplexPairTy VisitBinComma (const BinaryOperator *E);
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ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO);
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ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
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};
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} // end anonymous namespace.
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//===----------------------------------------------------------------------===//
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// Utilities
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//===----------------------------------------------------------------------===//
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/// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
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/// load the real and imaginary pieces, returning them as Real/Imag.
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ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
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bool isVolatile) {
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llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
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llvm::Constant *One = llvm::ConstantInt::get(llvm::Type::Int32Ty, 1);
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// FIXME: It would be nice to make this "Ptr->getName()+realp"
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llvm::Value *RealPtr = Builder.CreateGEP(SrcPtr, Zero, Zero, "realp");
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llvm::Value *ImagPtr = Builder.CreateGEP(SrcPtr, Zero, One, "imagp");
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// FIXME: It would be nice to make this "Ptr->getName()+real"
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llvm::Value *Real = Builder.CreateLoad(RealPtr, isVolatile, "real");
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llvm::Value *Imag = Builder.CreateLoad(ImagPtr, isVolatile, "imag");
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return ComplexPairTy(Real, Imag);
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}
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/// EmitStoreOfComplex - Store the specified real/imag parts into the
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/// specified value pointer.
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void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
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bool isVolatile) {
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llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
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llvm::Constant *One = llvm::ConstantInt::get(llvm::Type::Int32Ty, 1);
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llvm::Value *RealPtr = Builder.CreateGEP(Ptr, Zero, Zero, "real");
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llvm::Value *ImagPtr = Builder.CreateGEP(Ptr, Zero, One, "imag");
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Builder.CreateStore(Val.first, RealPtr, isVolatile);
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Builder.CreateStore(Val.second, ImagPtr, isVolatile);
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}
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//===----------------------------------------------------------------------===//
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// Visitor Methods
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//===----------------------------------------------------------------------===//
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ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
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fprintf(stderr, "Unimplemented complex expr!\n");
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E->dump();
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const llvm::Type *EltTy =
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CGF.ConvertType(E->getType()->getAsComplexType()->getElementType());
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llvm::Value *U = llvm::UndefValue::get(EltTy);
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return ComplexPairTy(U, U);
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}
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ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
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llvm::Value *AggPtr = CGF.EmitCallExpr(E).getAggregateAddr();
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return EmitLoadOfComplex(AggPtr, false);
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}
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ComplexPairTy ComplexExprEmitter::VisitPrePostIncDec(const UnaryOperator *E,
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bool isInc, bool isPre) {
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LValue LV = CGF.EmitLValue(E->getSubExpr());
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// FIXME: Handle volatile!
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ComplexPairTy InVal = EmitLoadOfComplex(LV.getAddress(), false);
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int AmountVal = isInc ? 1 : -1;
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llvm::Value *NextVal;
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if (isa<llvm::IntegerType>(InVal.first->getType()))
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NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal);
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else
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NextVal = llvm::ConstantFP::get(InVal.first->getType(), AmountVal);
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// Add the inc/dec to the real part.
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NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
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ComplexPairTy IncVal(NextVal, InVal.second);
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// Store the updated result through the lvalue.
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EmitStoreOfComplex(IncVal, LV.getAddress(), false); /* FIXME: Volatile */
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// If this is a postinc, return the value read from memory, otherwise use the
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// updated value.
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return isPre ? IncVal : InVal;
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}
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ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
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ComplexPairTy Op = Visit(E->getSubExpr());
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llvm::Value *ResR = Builder.CreateNeg(Op.first, "neg.r");
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llvm::Value *ResI = Builder.CreateNeg(Op.second, "neg.i");
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return ComplexPairTy(ResR, ResI);
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}
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ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
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// ~(a+ib) = a + i*-b
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ComplexPairTy Op = Visit(E->getSubExpr());
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llvm::Value *ResI = Builder.CreateNeg(Op.second, "conj.i");
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return ComplexPairTy(Op.first, ResI);
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}
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ComplexPairTy ComplexExprEmitter::VisitBinAdd(const BinaryOperator *E) {
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ComplexPairTy LHS = Visit(E->getLHS());
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ComplexPairTy RHS = Visit(E->getRHS());
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llvm::Value *ResR = Builder.CreateAdd(LHS.first, RHS.first, "add.r");
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llvm::Value *ResI = Builder.CreateAdd(LHS.second, RHS.second, "add.i");
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return ComplexPairTy(ResR, ResI);
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}
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ComplexPairTy ComplexExprEmitter::VisitBinSub(const BinaryOperator *E) {
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ComplexPairTy LHS = Visit(E->getLHS());
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ComplexPairTy RHS = Visit(E->getRHS());
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llvm::Value *ResR = Builder.CreateSub(LHS.first, RHS.first, "sub.r");
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llvm::Value *ResI = Builder.CreateSub(LHS.second, RHS.second, "sub.i");
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return ComplexPairTy(ResR, ResI);
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}
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ComplexPairTy ComplexExprEmitter::VisitBinMul(const BinaryOperator *E) {
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ComplexPairTy LHS = Visit(E->getLHS());
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ComplexPairTy RHS = Visit(E->getRHS());
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llvm::Value *ResRl = Builder.CreateMul(LHS.first, RHS.first, "mul.rl");
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llvm::Value *ResRr = Builder.CreateMul(LHS.second, RHS.second, "mul.rr");
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llvm::Value *ResR = Builder.CreateSub(ResRl, ResRr, "mul.r");
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llvm::Value *ResIl = Builder.CreateMul(LHS.second, RHS.first, "mul.il");
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llvm::Value *ResIr = Builder.CreateMul(LHS.first, RHS.second, "mul.ir");
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llvm::Value *ResI = Builder.CreateAdd(ResIl, ResIr, "mul.i");
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return ComplexPairTy(ResR, ResI);
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}
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ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
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assert(E->getLHS()->getType().getCanonicalType() ==
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E->getRHS()->getType().getCanonicalType() && "Invalid assignment");
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// Emit the RHS.
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ComplexPairTy Val = Visit(E->getRHS());
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// Compute the address to store into.
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LValue LHS = CGF.EmitLValue(E->getLHS());
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// Store into it.
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// FIXME: Volatility!
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EmitStoreOfComplex(Val, LHS.getAddress(), false);
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return Val;
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}
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ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
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CGF.EmitStmt(E->getLHS());
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return Visit(E->getRHS());
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}
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ComplexPairTy ComplexExprEmitter::
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VisitConditionalOperator(const ConditionalOperator *E) {
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llvm::BasicBlock *LHSBlock = new llvm::BasicBlock("cond.?");
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llvm::BasicBlock *RHSBlock = new llvm::BasicBlock("cond.:");
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llvm::BasicBlock *ContBlock = new llvm::BasicBlock("cond.cont");
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llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond());
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Builder.CreateCondBr(Cond, LHSBlock, RHSBlock);
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CGF.EmitBlock(LHSBlock);
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// Handle the GNU extension for missing LHS.
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assert(E->getLHS() && "Must have LHS for complex value");
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ComplexPairTy LHS = Visit(E->getLHS());
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Builder.CreateBr(ContBlock);
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LHSBlock = Builder.GetInsertBlock();
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CGF.EmitBlock(RHSBlock);
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ComplexPairTy RHS = Visit(E->getRHS());
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Builder.CreateBr(ContBlock);
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RHSBlock = Builder.GetInsertBlock();
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CGF.EmitBlock(ContBlock);
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// Create a PHI node for the real part.
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llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), "cond.r");
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RealPN->reserveOperandSpace(2);
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RealPN->addIncoming(LHS.first, LHSBlock);
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RealPN->addIncoming(RHS.first, RHSBlock);
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// Create a PHI node for the imaginary part.
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llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), "cond.i");
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ImagPN->reserveOperandSpace(2);
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ImagPN->addIncoming(LHS.second, LHSBlock);
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ImagPN->addIncoming(RHS.second, RHSBlock);
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return ComplexPairTy(RealPN, ImagPN);
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}
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ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
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llvm::APSInt CondVal(32);
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bool IsConst = E->getCond()->isIntegerConstantExpr(CondVal, CGF.getContext());
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assert(IsConst && "Condition of choose expr must be i-c-e"); IsConst=IsConst;
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// Emit the LHS or RHS as appropriate.
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return Visit(CondVal != 0 ? E->getLHS() : E->getRHS());
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}
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//===----------------------------------------------------------------------===//
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// Entry Point into this File
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//===----------------------------------------------------------------------===//
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/// EmitComplexExpr - Emit the computation of the specified expression of
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/// complex type, ignoring the result.
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ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E) {
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assert(E && E->getType()->isComplexType() &&
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"Invalid complex expression to emit");
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return ComplexExprEmitter(*this).Visit(const_cast<Expr*>(E));
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}
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/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
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/// of complex type, storing into the specified Value*.
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void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
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llvm::Value *DestAddr) {
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assert(E && E->getType()->isComplexType() &&
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"Invalid complex expression to emit");
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ComplexExprEmitter Emitter(*this);
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ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
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Emitter.EmitStoreOfComplex(Val, DestAddr, false);
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}
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