Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 1 | //===--- CGComplexExpr.cpp - Emit LLVM Code for Complex Exprs -------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file was developed by Chris Lattner and is distributed under |
| 6 | // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This contains code to emit Expr nodes with complex types as LLVM code. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
| 15 | #include "CodeGenModule.h" |
| 16 | #include "clang/AST/AST.h" |
| 17 | #include "llvm/Constants.h" |
| 18 | #include "llvm/Function.h" |
| 19 | #include "llvm/Support/Compiler.h" |
| 20 | using namespace clang; |
| 21 | using namespace CodeGen; |
| 22 | |
| 23 | //===----------------------------------------------------------------------===// |
Chris Lattner | 05ba49c | 2007-08-21 05:54:53 +0000 | [diff] [blame] | 24 | // Complex Expression Emitter |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 25 | //===----------------------------------------------------------------------===// |
| 26 | |
Chris Lattner | 58dee10 | 2007-08-21 16:57:55 +0000 | [diff] [blame] | 27 | typedef CodeGenFunction::ComplexPairTy ComplexPairTy; |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 28 | |
| 29 | namespace { |
| 30 | class VISIBILITY_HIDDEN ComplexExprEmitter |
| 31 | : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> { |
| 32 | CodeGenFunction &CGF; |
| 33 | public: |
| 34 | ComplexExprEmitter(CodeGenFunction &cgf) : CGF(cgf) { |
| 35 | } |
| 36 | |
| 37 | |
| 38 | //===--------------------------------------------------------------------===// |
| 39 | // Utilities |
| 40 | //===--------------------------------------------------------------------===// |
| 41 | |
| 42 | /// EmitLoadOfLValue - Given an expression with complex type that represents a |
| 43 | /// value l-value, this method emits the address of the l-value, then loads |
| 44 | /// and returns the result. |
| 45 | ComplexPairTy EmitLoadOfLValue(const Expr *E); |
| 46 | |
| 47 | |
| 48 | //===--------------------------------------------------------------------===// |
| 49 | // Visitor Methods |
| 50 | //===--------------------------------------------------------------------===// |
| 51 | |
| 52 | ComplexPairTy VisitStmt(Stmt *S) { |
| 53 | fprintf(stderr, "Unimplemented agg expr!\n"); |
| 54 | S->dump(); |
| 55 | return ComplexPairTy(); |
| 56 | } |
| 57 | ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());} |
| 58 | |
| 59 | // l-values. |
| 60 | ComplexPairTy VisitDeclRefExpr(DeclRefExpr *DRE) { |
| 61 | return EmitLoadOfLValue(DRE); |
| 62 | } |
| 63 | // case Expr::ArraySubscriptExprClass: |
| 64 | |
| 65 | // Operators. |
| 66 | // case Expr::UnaryOperatorClass: |
| 67 | // case Expr::ImplicitCastExprClass: |
| 68 | // case Expr::CastExprClass: |
| 69 | // case Expr::CallExprClass: |
| 70 | ComplexPairTy VisitBinaryOperator(const BinaryOperator *BO); |
Chris Lattner | 2823c19 | 2007-08-21 16:34:16 +0000 | [diff] [blame] | 71 | ComplexPairTy VisitBinMul (const BinaryOperator *E); |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 72 | ComplexPairTy VisitBinAdd (const BinaryOperator *E); |
Chris Lattner | 4034edb | 2007-08-21 17:12:50 +0000 | [diff] [blame^] | 73 | // FIXME: div/rem |
| 74 | // GCC rejects and/or/xor for integer complex. |
| 75 | // Logical and/or always return int, never complex. |
Chris Lattner | 58dee10 | 2007-08-21 16:57:55 +0000 | [diff] [blame] | 76 | |
| 77 | // No comparisons produce a complex result. |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 78 | ComplexPairTy VisitBinAssign (const BinaryOperator *E); |
| 79 | |
| 80 | |
| 81 | ComplexPairTy VisitConditionalOperator(const ConditionalOperator *CO); |
| 82 | // case Expr::ChooseExprClass: |
| 83 | }; |
| 84 | } // end anonymous namespace. |
| 85 | |
| 86 | //===----------------------------------------------------------------------===// |
| 87 | // Utilities |
| 88 | //===----------------------------------------------------------------------===// |
| 89 | |
| 90 | /// EmitLoadOfLValue - Given an expression with complex type that represents a |
| 91 | /// value l-value, this method emits the address of the l-value, then loads |
| 92 | /// and returns the result. |
| 93 | ComplexPairTy ComplexExprEmitter::EmitLoadOfLValue(const Expr *E) { |
| 94 | LValue LV = CGF.EmitLValue(E); |
| 95 | assert(LV.isSimple() && "Can't have complex bitfield, vector, etc"); |
| 96 | |
| 97 | // Load the real/imag values. |
| 98 | llvm::Value *Real, *Imag; |
| 99 | CGF.EmitLoadOfComplex(LV.getAddress(), Real, Imag); |
| 100 | return ComplexPairTy(Real, Imag); |
| 101 | } |
| 102 | |
| 103 | //===----------------------------------------------------------------------===// |
| 104 | // Visitor Methods |
| 105 | //===----------------------------------------------------------------------===// |
| 106 | |
| 107 | ComplexPairTy ComplexExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { |
Chris Lattner | 05ba49c | 2007-08-21 05:54:53 +0000 | [diff] [blame] | 108 | fprintf(stderr, "Unimplemented complex binary expr!\n"); |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 109 | E->dump(); |
| 110 | return ComplexPairTy(); |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | ComplexPairTy ComplexExprEmitter::VisitBinAdd(const BinaryOperator *E) { |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 114 | ComplexPairTy LHS = Visit(E->getLHS()); |
| 115 | ComplexPairTy RHS = Visit(E->getRHS()); |
| 116 | |
| 117 | llvm::Value *ResR = CGF.Builder.CreateAdd(LHS.first, RHS.first, "add.r"); |
| 118 | llvm::Value *ResI = CGF.Builder.CreateAdd(LHS.second, RHS.second, "add.i"); |
| 119 | |
| 120 | return ComplexPairTy(ResR, ResI); |
| 121 | } |
| 122 | |
Chris Lattner | 2823c19 | 2007-08-21 16:34:16 +0000 | [diff] [blame] | 123 | ComplexPairTy ComplexExprEmitter::VisitBinMul(const BinaryOperator *E) { |
| 124 | ComplexPairTy LHS = Visit(E->getLHS()); |
| 125 | ComplexPairTy RHS = Visit(E->getRHS()); |
| 126 | |
| 127 | llvm::Value *ResRl = CGF.Builder.CreateMul(LHS.first, RHS.first, "mul.rl"); |
| 128 | llvm::Value *ResRr = CGF.Builder.CreateMul(LHS.second, RHS.second, "mul.rr"); |
| 129 | llvm::Value *ResR = CGF.Builder.CreateSub(ResRl, ResRr, "mul.r"); |
| 130 | |
| 131 | llvm::Value *ResIl = CGF.Builder.CreateMul(LHS.second, RHS.first, "mul.il"); |
| 132 | llvm::Value *ResIr = CGF.Builder.CreateMul(LHS.first, RHS.second, "mul.ir"); |
| 133 | llvm::Value *ResI = CGF.Builder.CreateAdd(ResIl, ResIr, "mul.i"); |
| 134 | |
| 135 | return ComplexPairTy(ResR, ResI); |
| 136 | } |
| 137 | |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 138 | ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) { |
| 139 | assert(E->getLHS()->getType().getCanonicalType() == |
| 140 | E->getRHS()->getType().getCanonicalType() && "Invalid assignment"); |
| 141 | // Emit the RHS. |
| 142 | ComplexPairTy Val = Visit(E->getRHS()); |
| 143 | |
| 144 | // Compute the address to store into. |
| 145 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
| 146 | |
| 147 | // Store into it. |
| 148 | // FIXME: Volatility! |
| 149 | CGF.EmitStoreOfComplex(Val.first, Val.second, LHS.getAddress()); |
| 150 | return Val; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | ComplexPairTy ComplexExprEmitter:: |
| 155 | VisitConditionalOperator(const ConditionalOperator *E) { |
| 156 | llvm::BasicBlock *LHSBlock = new llvm::BasicBlock("cond.?"); |
| 157 | llvm::BasicBlock *RHSBlock = new llvm::BasicBlock("cond.:"); |
| 158 | llvm::BasicBlock *ContBlock = new llvm::BasicBlock("cond.cont"); |
| 159 | |
| 160 | llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond()); |
| 161 | CGF.Builder.CreateCondBr(Cond, LHSBlock, RHSBlock); |
| 162 | |
| 163 | CGF.EmitBlock(LHSBlock); |
| 164 | |
| 165 | // Handle the GNU extension for missing LHS. |
Chris Lattner | 05ba49c | 2007-08-21 05:54:53 +0000 | [diff] [blame] | 166 | assert(E->getLHS() && "Must have LHS for complex value"); |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 167 | |
| 168 | ComplexPairTy LHS = Visit(E->getLHS()); |
| 169 | CGF.Builder.CreateBr(ContBlock); |
| 170 | LHSBlock = CGF.Builder.GetInsertBlock(); |
| 171 | |
| 172 | CGF.EmitBlock(RHSBlock); |
| 173 | |
| 174 | ComplexPairTy RHS = Visit(E->getRHS()); |
| 175 | CGF.Builder.CreateBr(ContBlock); |
| 176 | RHSBlock = CGF.Builder.GetInsertBlock(); |
| 177 | |
| 178 | CGF.EmitBlock(ContBlock); |
| 179 | |
| 180 | // Create a PHI node for the real part. |
| 181 | llvm::PHINode *RealPN = CGF.Builder.CreatePHI(LHS.first->getType(), "cond.r"); |
| 182 | RealPN->reserveOperandSpace(2); |
| 183 | RealPN->addIncoming(LHS.first, LHSBlock); |
| 184 | RealPN->addIncoming(RHS.first, RHSBlock); |
| 185 | |
| 186 | // Create a PHI node for the imaginary part. |
| 187 | llvm::PHINode *ImagPN = CGF.Builder.CreatePHI(LHS.first->getType(), "cond.i"); |
| 188 | ImagPN->reserveOperandSpace(2); |
| 189 | ImagPN->addIncoming(LHS.second, LHSBlock); |
| 190 | ImagPN->addIncoming(RHS.second, RHSBlock); |
| 191 | |
| 192 | return ComplexPairTy(RealPN, ImagPN); |
| 193 | } |
| 194 | |
| 195 | //===----------------------------------------------------------------------===// |
| 196 | // Entry Point into this File |
| 197 | //===----------------------------------------------------------------------===// |
| 198 | |
| 199 | /// EmitComplexExpr - Emit the computation of the specified expression of |
| 200 | /// complex type, ignoring the result. |
Chris Lattner | 58dee10 | 2007-08-21 16:57:55 +0000 | [diff] [blame] | 201 | ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E) { |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 202 | assert(E && E->getType()->isComplexType() && |
| 203 | "Invalid complex expression to emit"); |
| 204 | |
Chris Lattner | 58dee10 | 2007-08-21 16:57:55 +0000 | [diff] [blame] | 205 | return ComplexExprEmitter(*this).Visit(const_cast<Expr*>(E)); |
Chris Lattner | b6ef18a | 2007-08-21 05:54:00 +0000 | [diff] [blame] | 206 | } |
| 207 | |