CGExprScalar.cpp revision 201361
1193326Sed//===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===// 2193326Sed// 3193326Sed// The LLVM Compiler Infrastructure 4193326Sed// 5193326Sed// This file is distributed under the University of Illinois Open Source 6193326Sed// License. See LICENSE.TXT for details. 7193326Sed// 8193326Sed//===----------------------------------------------------------------------===// 9193326Sed// 10193326Sed// This contains code to emit Expr nodes with scalar LLVM types as LLVM code. 11193326Sed// 12193326Sed//===----------------------------------------------------------------------===// 13193326Sed 14193326Sed#include "CodeGenFunction.h" 15198092Srdivacky#include "CGObjCRuntime.h" 16193326Sed#include "CodeGenModule.h" 17193326Sed#include "clang/AST/ASTContext.h" 18193326Sed#include "clang/AST/DeclObjC.h" 19193326Sed#include "clang/AST/RecordLayout.h" 20193326Sed#include "clang/AST/StmtVisitor.h" 21193326Sed#include "clang/Basic/TargetInfo.h" 22193326Sed#include "llvm/Constants.h" 23193326Sed#include "llvm/Function.h" 24193326Sed#include "llvm/GlobalVariable.h" 25193326Sed#include "llvm/Intrinsics.h" 26193326Sed#include "llvm/Module.h" 27193326Sed#include "llvm/Support/CFG.h" 28193326Sed#include "llvm/Target/TargetData.h" 29193326Sed#include <cstdarg> 30193326Sed 31193326Sedusing namespace clang; 32193326Sedusing namespace CodeGen; 33193326Sedusing llvm::Value; 34193326Sed 35193326Sed//===----------------------------------------------------------------------===// 36193326Sed// Scalar Expression Emitter 37193326Sed//===----------------------------------------------------------------------===// 38193326Sed 39193326Sedstruct BinOpInfo { 40193326Sed Value *LHS; 41193326Sed Value *RHS; 42193326Sed QualType Ty; // Computation Type. 43193326Sed const BinaryOperator *E; 44193326Sed}; 45193326Sed 46193326Sednamespace { 47199990Srdivackyclass ScalarExprEmitter 48193326Sed : public StmtVisitor<ScalarExprEmitter, Value*> { 49193326Sed CodeGenFunction &CGF; 50193326Sed CGBuilderTy &Builder; 51193326Sed bool IgnoreResultAssign; 52198092Srdivacky llvm::LLVMContext &VMContext; 53193326Sedpublic: 54193326Sed 55193326Sed ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false) 56198092Srdivacky : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira), 57198092Srdivacky VMContext(cgf.getLLVMContext()) { 58193326Sed } 59198092Srdivacky 60193326Sed //===--------------------------------------------------------------------===// 61193326Sed // Utilities 62193326Sed //===--------------------------------------------------------------------===// 63193326Sed 64193326Sed bool TestAndClearIgnoreResultAssign() { 65198092Srdivacky bool I = IgnoreResultAssign; 66198092Srdivacky IgnoreResultAssign = false; 67198092Srdivacky return I; 68198092Srdivacky } 69193326Sed 70193326Sed const llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); } 71193326Sed LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); } 72201361Srdivacky LValue EmitCheckedLValue(const Expr *E) { return CGF.EmitCheckedLValue(E); } 73193326Sed 74193326Sed Value *EmitLoadOfLValue(LValue LV, QualType T) { 75193326Sed return CGF.EmitLoadOfLValue(LV, T).getScalarVal(); 76193326Sed } 77198092Srdivacky 78193326Sed /// EmitLoadOfLValue - Given an expression with complex type that represents a 79193326Sed /// value l-value, this method emits the address of the l-value, then loads 80193326Sed /// and returns the result. 81193326Sed Value *EmitLoadOfLValue(const Expr *E) { 82201361Srdivacky return EmitLoadOfLValue(EmitCheckedLValue(E), E->getType()); 83193326Sed } 84198092Srdivacky 85193326Sed /// EmitConversionToBool - Convert the specified expression value to a 86193326Sed /// boolean (i1) truth value. This is equivalent to "Val != 0". 87193326Sed Value *EmitConversionToBool(Value *Src, QualType DstTy); 88198092Srdivacky 89193326Sed /// EmitScalarConversion - Emit a conversion from the specified type to the 90193326Sed /// specified destination type, both of which are LLVM scalar types. 91193326Sed Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy); 92193326Sed 93193326Sed /// EmitComplexToScalarConversion - Emit a conversion from the specified 94198092Srdivacky /// complex type to the specified destination type, where the destination type 95198092Srdivacky /// is an LLVM scalar type. 96193326Sed Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src, 97193326Sed QualType SrcTy, QualType DstTy); 98193326Sed 99193326Sed //===--------------------------------------------------------------------===// 100193326Sed // Visitor Methods 101193326Sed //===--------------------------------------------------------------------===// 102193326Sed 103193326Sed Value *VisitStmt(Stmt *S) { 104193326Sed S->dump(CGF.getContext().getSourceManager()); 105193326Sed assert(0 && "Stmt can't have complex result type!"); 106193326Sed return 0; 107193326Sed } 108193326Sed Value *VisitExpr(Expr *S); 109198398Srdivacky 110193326Sed Value *VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr()); } 111193326Sed 112193326Sed // Leaves. 113193326Sed Value *VisitIntegerLiteral(const IntegerLiteral *E) { 114198092Srdivacky return llvm::ConstantInt::get(VMContext, E->getValue()); 115193326Sed } 116193326Sed Value *VisitFloatingLiteral(const FloatingLiteral *E) { 117198092Srdivacky return llvm::ConstantFP::get(VMContext, E->getValue()); 118193326Sed } 119193326Sed Value *VisitCharacterLiteral(const CharacterLiteral *E) { 120193326Sed return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); 121193326Sed } 122193326Sed Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 123193326Sed return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); 124193326Sed } 125193326Sed Value *VisitCXXZeroInitValueExpr(const CXXZeroInitValueExpr *E) { 126193326Sed return llvm::Constant::getNullValue(ConvertType(E->getType())); 127193326Sed } 128193326Sed Value *VisitGNUNullExpr(const GNUNullExpr *E) { 129193326Sed return llvm::Constant::getNullValue(ConvertType(E->getType())); 130193326Sed } 131193326Sed Value *VisitTypesCompatibleExpr(const TypesCompatibleExpr *E) { 132193326Sed return llvm::ConstantInt::get(ConvertType(E->getType()), 133193326Sed CGF.getContext().typesAreCompatible( 134193326Sed E->getArgType1(), E->getArgType2())); 135193326Sed } 136193326Sed Value *VisitSizeOfAlignOfExpr(const SizeOfAlignOfExpr *E); 137193326Sed Value *VisitAddrLabelExpr(const AddrLabelExpr *E) { 138198893Srdivacky llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel()); 139198893Srdivacky return Builder.CreateBitCast(V, ConvertType(E->getType())); 140193326Sed } 141198092Srdivacky 142193326Sed // l-values. 143193326Sed Value *VisitDeclRefExpr(DeclRefExpr *E) { 144199990Srdivacky Expr::EvalResult Result; 145199990Srdivacky if (E->Evaluate(Result, CGF.getContext()) && Result.Val.isInt()) { 146199990Srdivacky assert(!Result.HasSideEffects && "Constant declref with side-effect?!"); 147199990Srdivacky return llvm::ConstantInt::get(VMContext, Result.Val.getInt()); 148199990Srdivacky } 149193326Sed return EmitLoadOfLValue(E); 150193326Sed } 151198092Srdivacky Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) { 152198092Srdivacky return CGF.EmitObjCSelectorExpr(E); 153193326Sed } 154198092Srdivacky Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) { 155198092Srdivacky return CGF.EmitObjCProtocolExpr(E); 156193326Sed } 157198092Srdivacky Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 158193326Sed return EmitLoadOfLValue(E); 159193326Sed } 160193326Sed Value *VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 161193326Sed return EmitLoadOfLValue(E); 162193326Sed } 163198092Srdivacky Value *VisitObjCImplicitSetterGetterRefExpr( 164198092Srdivacky ObjCImplicitSetterGetterRefExpr *E) { 165193326Sed return EmitLoadOfLValue(E); 166193326Sed } 167193326Sed Value *VisitObjCMessageExpr(ObjCMessageExpr *E) { 168193326Sed return CGF.EmitObjCMessageExpr(E).getScalarVal(); 169193326Sed } 170193326Sed 171200583Srdivacky Value *VisitObjCIsaExpr(ObjCIsaExpr *E) { 172200583Srdivacky LValue LV = CGF.EmitObjCIsaExpr(E); 173200583Srdivacky Value *V = CGF.EmitLoadOfLValue(LV, E->getType()).getScalarVal(); 174200583Srdivacky return V; 175200583Srdivacky } 176200583Srdivacky 177193326Sed Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E); 178193326Sed Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E); 179199990Srdivacky Value *VisitMemberExpr(MemberExpr *E); 180193326Sed Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); } 181193326Sed Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 182193326Sed return EmitLoadOfLValue(E); 183193326Sed } 184193326Sed Value *VisitStringLiteral(Expr *E) { return EmitLValue(E).getAddress(); } 185193326Sed Value *VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { 186193326Sed return EmitLValue(E).getAddress(); 187193326Sed } 188198092Srdivacky 189193326Sed Value *VisitPredefinedExpr(Expr *E) { return EmitLValue(E).getAddress(); } 190193326Sed 191198398Srdivacky Value *VisitInitListExpr(InitListExpr *E); 192198092Srdivacky 193193326Sed Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 194193326Sed return llvm::Constant::getNullValue(ConvertType(E->getType())); 195193326Sed } 196199990Srdivacky Value *VisitCastExpr(CastExpr *E) { 197193326Sed // Make sure to evaluate VLA bounds now so that we have them for later. 198193326Sed if (E->getType()->isVariablyModifiedType()) 199193326Sed CGF.EmitVLASize(E->getType()); 200193326Sed 201198092Srdivacky return EmitCastExpr(E); 202193326Sed } 203199990Srdivacky Value *EmitCastExpr(CastExpr *E); 204193326Sed 205193326Sed Value *VisitCallExpr(const CallExpr *E) { 206193326Sed if (E->getCallReturnType()->isReferenceType()) 207193326Sed return EmitLoadOfLValue(E); 208198092Srdivacky 209193326Sed return CGF.EmitCallExpr(E).getScalarVal(); 210193326Sed } 211193326Sed 212193326Sed Value *VisitStmtExpr(const StmtExpr *E); 213193326Sed 214193326Sed Value *VisitBlockDeclRefExpr(const BlockDeclRefExpr *E); 215198092Srdivacky 216193326Sed // Unary Operators. 217193326Sed Value *VisitPrePostIncDec(const UnaryOperator *E, bool isInc, bool isPre); 218193326Sed Value *VisitUnaryPostDec(const UnaryOperator *E) { 219193326Sed return VisitPrePostIncDec(E, false, false); 220193326Sed } 221193326Sed Value *VisitUnaryPostInc(const UnaryOperator *E) { 222193326Sed return VisitPrePostIncDec(E, true, false); 223193326Sed } 224193326Sed Value *VisitUnaryPreDec(const UnaryOperator *E) { 225193326Sed return VisitPrePostIncDec(E, false, true); 226193326Sed } 227193326Sed Value *VisitUnaryPreInc(const UnaryOperator *E) { 228193326Sed return VisitPrePostIncDec(E, true, true); 229193326Sed } 230193326Sed Value *VisitUnaryAddrOf(const UnaryOperator *E) { 231193326Sed return EmitLValue(E->getSubExpr()).getAddress(); 232193326Sed } 233193326Sed Value *VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); } 234193326Sed Value *VisitUnaryPlus(const UnaryOperator *E) { 235193326Sed // This differs from gcc, though, most likely due to a bug in gcc. 236193326Sed TestAndClearIgnoreResultAssign(); 237193326Sed return Visit(E->getSubExpr()); 238193326Sed } 239193326Sed Value *VisitUnaryMinus (const UnaryOperator *E); 240193326Sed Value *VisitUnaryNot (const UnaryOperator *E); 241193326Sed Value *VisitUnaryLNot (const UnaryOperator *E); 242193326Sed Value *VisitUnaryReal (const UnaryOperator *E); 243193326Sed Value *VisitUnaryImag (const UnaryOperator *E); 244193326Sed Value *VisitUnaryExtension(const UnaryOperator *E) { 245193326Sed return Visit(E->getSubExpr()); 246193326Sed } 247193326Sed Value *VisitUnaryOffsetOf(const UnaryOperator *E); 248198092Srdivacky 249193326Sed // C++ 250193326Sed Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 251193326Sed return Visit(DAE->getExpr()); 252193326Sed } 253193326Sed Value *VisitCXXThisExpr(CXXThisExpr *TE) { 254193326Sed return CGF.LoadCXXThis(); 255198092Srdivacky } 256198092Srdivacky 257193326Sed Value *VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 258193326Sed return CGF.EmitCXXExprWithTemporaries(E).getScalarVal(); 259193326Sed } 260193326Sed Value *VisitCXXNewExpr(const CXXNewExpr *E) { 261193326Sed return CGF.EmitCXXNewExpr(E); 262193326Sed } 263198092Srdivacky Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) { 264198092Srdivacky CGF.EmitCXXDeleteExpr(E); 265198092Srdivacky return 0; 266198092Srdivacky } 267200583Srdivacky Value *VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 268200583Srdivacky return llvm::ConstantInt::get(Builder.getInt1Ty(), 269200583Srdivacky E->EvaluateTrait(CGF.getContext())); 270200583Srdivacky } 271198092Srdivacky 272198092Srdivacky Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) { 273198092Srdivacky // C++ [expr.pseudo]p1: 274198092Srdivacky // The result shall only be used as the operand for the function call 275198092Srdivacky // operator (), and the result of such a call has type void. The only 276198092Srdivacky // effect is the evaluation of the postfix-expression before the dot or 277198092Srdivacky // arrow. 278198092Srdivacky CGF.EmitScalarExpr(E->getBase()); 279198092Srdivacky return 0; 280198092Srdivacky } 281198092Srdivacky 282198092Srdivacky Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 283198092Srdivacky return llvm::Constant::getNullValue(ConvertType(E->getType())); 284198092Srdivacky } 285198893Srdivacky 286198893Srdivacky Value *VisitCXXThrowExpr(const CXXThrowExpr *E) { 287198893Srdivacky CGF.EmitCXXThrowExpr(E); 288198893Srdivacky return 0; 289198893Srdivacky } 290198893Srdivacky 291193326Sed // Binary Operators. 292193326Sed Value *EmitMul(const BinOpInfo &Ops) { 293193326Sed if (CGF.getContext().getLangOptions().OverflowChecking 294193326Sed && Ops.Ty->isSignedIntegerType()) 295193326Sed return EmitOverflowCheckedBinOp(Ops); 296194613Sed if (Ops.LHS->getType()->isFPOrFPVector()) 297194613Sed return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul"); 298193326Sed return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul"); 299193326Sed } 300193326Sed /// Create a binary op that checks for overflow. 301193326Sed /// Currently only supports +, - and *. 302193326Sed Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops); 303193326Sed Value *EmitDiv(const BinOpInfo &Ops); 304193326Sed Value *EmitRem(const BinOpInfo &Ops); 305193326Sed Value *EmitAdd(const BinOpInfo &Ops); 306193326Sed Value *EmitSub(const BinOpInfo &Ops); 307193326Sed Value *EmitShl(const BinOpInfo &Ops); 308193326Sed Value *EmitShr(const BinOpInfo &Ops); 309193326Sed Value *EmitAnd(const BinOpInfo &Ops) { 310193326Sed return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and"); 311193326Sed } 312193326Sed Value *EmitXor(const BinOpInfo &Ops) { 313193326Sed return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor"); 314193326Sed } 315193326Sed Value *EmitOr (const BinOpInfo &Ops) { 316193326Sed return Builder.CreateOr(Ops.LHS, Ops.RHS, "or"); 317193326Sed } 318193326Sed 319193326Sed BinOpInfo EmitBinOps(const BinaryOperator *E); 320193326Sed Value *EmitCompoundAssign(const CompoundAssignOperator *E, 321193326Sed Value *(ScalarExprEmitter::*F)(const BinOpInfo &)); 322193326Sed 323193326Sed // Binary operators and binary compound assignment operators. 324193326Sed#define HANDLEBINOP(OP) \ 325193326Sed Value *VisitBin ## OP(const BinaryOperator *E) { \ 326193326Sed return Emit ## OP(EmitBinOps(E)); \ 327193326Sed } \ 328193326Sed Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \ 329193326Sed return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \ 330193326Sed } 331201361Srdivacky HANDLEBINOP(Mul) 332201361Srdivacky HANDLEBINOP(Div) 333201361Srdivacky HANDLEBINOP(Rem) 334201361Srdivacky HANDLEBINOP(Add) 335201361Srdivacky HANDLEBINOP(Sub) 336201361Srdivacky HANDLEBINOP(Shl) 337201361Srdivacky HANDLEBINOP(Shr) 338201361Srdivacky HANDLEBINOP(And) 339201361Srdivacky HANDLEBINOP(Xor) 340201361Srdivacky HANDLEBINOP(Or) 341193326Sed#undef HANDLEBINOP 342193326Sed 343193326Sed // Comparisons. 344193326Sed Value *EmitCompare(const BinaryOperator *E, unsigned UICmpOpc, 345193326Sed unsigned SICmpOpc, unsigned FCmpOpc); 346193326Sed#define VISITCOMP(CODE, UI, SI, FP) \ 347193326Sed Value *VisitBin##CODE(const BinaryOperator *E) { \ 348193326Sed return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \ 349193326Sed llvm::FCmpInst::FP); } 350201361Srdivacky VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT) 351201361Srdivacky VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT) 352201361Srdivacky VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE) 353201361Srdivacky VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE) 354201361Srdivacky VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ) 355201361Srdivacky VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE) 356193326Sed#undef VISITCOMP 357198092Srdivacky 358193326Sed Value *VisitBinAssign (const BinaryOperator *E); 359193326Sed 360193326Sed Value *VisitBinLAnd (const BinaryOperator *E); 361193326Sed Value *VisitBinLOr (const BinaryOperator *E); 362193326Sed Value *VisitBinComma (const BinaryOperator *E); 363193326Sed 364199482Srdivacky Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); } 365199482Srdivacky Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); } 366199482Srdivacky 367193326Sed // Other Operators. 368193326Sed Value *VisitBlockExpr(const BlockExpr *BE); 369193326Sed Value *VisitConditionalOperator(const ConditionalOperator *CO); 370193326Sed Value *VisitChooseExpr(ChooseExpr *CE); 371193326Sed Value *VisitVAArgExpr(VAArgExpr *VE); 372193326Sed Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) { 373193326Sed return CGF.EmitObjCStringLiteral(E); 374193326Sed } 375193326Sed}; 376193326Sed} // end anonymous namespace. 377193326Sed 378193326Sed//===----------------------------------------------------------------------===// 379193326Sed// Utilities 380193326Sed//===----------------------------------------------------------------------===// 381193326Sed 382193326Sed/// EmitConversionToBool - Convert the specified expression value to a 383193326Sed/// boolean (i1) truth value. This is equivalent to "Val != 0". 384193326SedValue *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) { 385198398Srdivacky assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs"); 386198092Srdivacky 387193326Sed if (SrcType->isRealFloatingType()) { 388193326Sed // Compare against 0.0 for fp scalars. 389193326Sed llvm::Value *Zero = llvm::Constant::getNullValue(Src->getType()); 390193326Sed return Builder.CreateFCmpUNE(Src, Zero, "tobool"); 391193326Sed } 392198092Srdivacky 393198092Srdivacky if (SrcType->isMemberPointerType()) { 394198092Srdivacky // FIXME: This is ABI specific. 395198092Srdivacky 396198092Srdivacky // Compare against -1. 397198092Srdivacky llvm::Value *NegativeOne = llvm::Constant::getAllOnesValue(Src->getType()); 398198092Srdivacky return Builder.CreateICmpNE(Src, NegativeOne, "tobool"); 399198092Srdivacky } 400198092Srdivacky 401193326Sed assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) && 402193326Sed "Unknown scalar type to convert"); 403198092Srdivacky 404193326Sed // Because of the type rules of C, we often end up computing a logical value, 405193326Sed // then zero extending it to int, then wanting it as a logical value again. 406193326Sed // Optimize this common case. 407193326Sed if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(Src)) { 408198092Srdivacky if (ZI->getOperand(0)->getType() == 409198092Srdivacky llvm::Type::getInt1Ty(CGF.getLLVMContext())) { 410193326Sed Value *Result = ZI->getOperand(0); 411193326Sed // If there aren't any more uses, zap the instruction to save space. 412193326Sed // Note that there can be more uses, for example if this 413193326Sed // is the result of an assignment. 414193326Sed if (ZI->use_empty()) 415193326Sed ZI->eraseFromParent(); 416193326Sed return Result; 417193326Sed } 418193326Sed } 419198092Srdivacky 420193326Sed // Compare against an integer or pointer null. 421193326Sed llvm::Value *Zero = llvm::Constant::getNullValue(Src->getType()); 422193326Sed return Builder.CreateICmpNE(Src, Zero, "tobool"); 423193326Sed} 424193326Sed 425193326Sed/// EmitScalarConversion - Emit a conversion from the specified type to the 426193326Sed/// specified destination type, both of which are LLVM scalar types. 427193326SedValue *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType, 428193326Sed QualType DstType) { 429193326Sed SrcType = CGF.getContext().getCanonicalType(SrcType); 430193326Sed DstType = CGF.getContext().getCanonicalType(DstType); 431193326Sed if (SrcType == DstType) return Src; 432198092Srdivacky 433193326Sed if (DstType->isVoidType()) return 0; 434193326Sed 435198092Srdivacky llvm::LLVMContext &VMContext = CGF.getLLVMContext(); 436198092Srdivacky 437193326Sed // Handle conversions to bool first, they are special: comparisons against 0. 438193326Sed if (DstType->isBooleanType()) 439193326Sed return EmitConversionToBool(Src, SrcType); 440198092Srdivacky 441193326Sed const llvm::Type *DstTy = ConvertType(DstType); 442193326Sed 443193326Sed // Ignore conversions like int -> uint. 444193326Sed if (Src->getType() == DstTy) 445193326Sed return Src; 446193326Sed 447198092Srdivacky // Handle pointer conversions next: pointers can only be converted to/from 448198092Srdivacky // other pointers and integers. Check for pointer types in terms of LLVM, as 449198092Srdivacky // some native types (like Obj-C id) may map to a pointer type. 450193326Sed if (isa<llvm::PointerType>(DstTy)) { 451193326Sed // The source value may be an integer, or a pointer. 452193326Sed if (isa<llvm::PointerType>(Src->getType())) 453193326Sed return Builder.CreateBitCast(Src, DstTy, "conv"); 454198092Srdivacky 455193326Sed assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?"); 456193326Sed // First, convert to the correct width so that we control the kind of 457193326Sed // extension. 458198092Srdivacky const llvm::Type *MiddleTy = 459198092Srdivacky llvm::IntegerType::get(VMContext, CGF.LLVMPointerWidth); 460193326Sed bool InputSigned = SrcType->isSignedIntegerType(); 461193326Sed llvm::Value* IntResult = 462193326Sed Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv"); 463193326Sed // Then, cast to pointer. 464193326Sed return Builder.CreateIntToPtr(IntResult, DstTy, "conv"); 465193326Sed } 466198092Srdivacky 467193326Sed if (isa<llvm::PointerType>(Src->getType())) { 468193326Sed // Must be an ptr to int cast. 469193326Sed assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?"); 470193326Sed return Builder.CreatePtrToInt(Src, DstTy, "conv"); 471193326Sed } 472198092Srdivacky 473193326Sed // A scalar can be splatted to an extended vector of the same element type 474198092Srdivacky if (DstType->isExtVectorType() && !SrcType->isVectorType()) { 475193326Sed // Cast the scalar to element type 476198092Srdivacky QualType EltTy = DstType->getAs<ExtVectorType>()->getElementType(); 477193326Sed llvm::Value *Elt = EmitScalarConversion(Src, SrcType, EltTy); 478193326Sed 479193326Sed // Insert the element in element zero of an undef vector 480193326Sed llvm::Value *UnV = llvm::UndefValue::get(DstTy); 481198092Srdivacky llvm::Value *Idx = 482198092Srdivacky llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 0); 483193326Sed UnV = Builder.CreateInsertElement(UnV, Elt, Idx, "tmp"); 484193326Sed 485193326Sed // Splat the element across to all elements 486193326Sed llvm::SmallVector<llvm::Constant*, 16> Args; 487193326Sed unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements(); 488193326Sed for (unsigned i = 0; i < NumElements; i++) 489198092Srdivacky Args.push_back(llvm::ConstantInt::get( 490198092Srdivacky llvm::Type::getInt32Ty(VMContext), 0)); 491198092Srdivacky 492193326Sed llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], NumElements); 493193326Sed llvm::Value *Yay = Builder.CreateShuffleVector(UnV, UnV, Mask, "splat"); 494193326Sed return Yay; 495193326Sed } 496193326Sed 497193326Sed // Allow bitcast from vector to integer/fp of the same size. 498193326Sed if (isa<llvm::VectorType>(Src->getType()) || 499193326Sed isa<llvm::VectorType>(DstTy)) 500193326Sed return Builder.CreateBitCast(Src, DstTy, "conv"); 501198092Srdivacky 502193326Sed // Finally, we have the arithmetic types: real int/float. 503193326Sed if (isa<llvm::IntegerType>(Src->getType())) { 504193326Sed bool InputSigned = SrcType->isSignedIntegerType(); 505193326Sed if (isa<llvm::IntegerType>(DstTy)) 506193326Sed return Builder.CreateIntCast(Src, DstTy, InputSigned, "conv"); 507193326Sed else if (InputSigned) 508193326Sed return Builder.CreateSIToFP(Src, DstTy, "conv"); 509193326Sed else 510193326Sed return Builder.CreateUIToFP(Src, DstTy, "conv"); 511193326Sed } 512198092Srdivacky 513193326Sed assert(Src->getType()->isFloatingPoint() && "Unknown real conversion"); 514193326Sed if (isa<llvm::IntegerType>(DstTy)) { 515193326Sed if (DstType->isSignedIntegerType()) 516193326Sed return Builder.CreateFPToSI(Src, DstTy, "conv"); 517193326Sed else 518193326Sed return Builder.CreateFPToUI(Src, DstTy, "conv"); 519193326Sed } 520193326Sed 521193326Sed assert(DstTy->isFloatingPoint() && "Unknown real conversion"); 522193326Sed if (DstTy->getTypeID() < Src->getType()->getTypeID()) 523193326Sed return Builder.CreateFPTrunc(Src, DstTy, "conv"); 524193326Sed else 525193326Sed return Builder.CreateFPExt(Src, DstTy, "conv"); 526193326Sed} 527193326Sed 528198092Srdivacky/// EmitComplexToScalarConversion - Emit a conversion from the specified complex 529198092Srdivacky/// type to the specified destination type, where the destination type is an 530198092Srdivacky/// LLVM scalar type. 531193326SedValue *ScalarExprEmitter:: 532193326SedEmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src, 533193326Sed QualType SrcTy, QualType DstTy) { 534193326Sed // Get the source element type. 535198092Srdivacky SrcTy = SrcTy->getAs<ComplexType>()->getElementType(); 536198092Srdivacky 537193326Sed // Handle conversions to bool first, they are special: comparisons against 0. 538193326Sed if (DstTy->isBooleanType()) { 539193326Sed // Complex != 0 -> (Real != 0) | (Imag != 0) 540193326Sed Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy); 541193326Sed Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy); 542193326Sed return Builder.CreateOr(Src.first, Src.second, "tobool"); 543193326Sed } 544198092Srdivacky 545193326Sed // C99 6.3.1.7p2: "When a value of complex type is converted to a real type, 546193326Sed // the imaginary part of the complex value is discarded and the value of the 547193326Sed // real part is converted according to the conversion rules for the 548198092Srdivacky // corresponding real type. 549193326Sed return EmitScalarConversion(Src.first, SrcTy, DstTy); 550193326Sed} 551193326Sed 552193326Sed 553193326Sed//===----------------------------------------------------------------------===// 554193326Sed// Visitor Methods 555193326Sed//===----------------------------------------------------------------------===// 556193326Sed 557193326SedValue *ScalarExprEmitter::VisitExpr(Expr *E) { 558193326Sed CGF.ErrorUnsupported(E, "scalar expression"); 559193326Sed if (E->getType()->isVoidType()) 560193326Sed return 0; 561193326Sed return llvm::UndefValue::get(CGF.ConvertType(E->getType())); 562193326Sed} 563193326Sed 564193326SedValue *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) { 565193326Sed llvm::SmallVector<llvm::Constant*, 32> indices; 566193326Sed for (unsigned i = 2; i < E->getNumSubExprs(); i++) { 567193326Sed indices.push_back(cast<llvm::Constant>(CGF.EmitScalarExpr(E->getExpr(i)))); 568193326Sed } 569193326Sed Value* V1 = CGF.EmitScalarExpr(E->getExpr(0)); 570193326Sed Value* V2 = CGF.EmitScalarExpr(E->getExpr(1)); 571193326Sed Value* SV = llvm::ConstantVector::get(indices.begin(), indices.size()); 572193326Sed return Builder.CreateShuffleVector(V1, V2, SV, "shuffle"); 573193326Sed} 574199990SrdivackyValue *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) { 575199990Srdivacky Expr::EvalResult Result; 576199990Srdivacky if (E->Evaluate(Result, CGF.getContext()) && Result.Val.isInt()) { 577199990Srdivacky if (E->isArrow()) 578199990Srdivacky CGF.EmitScalarExpr(E->getBase()); 579199990Srdivacky else 580199990Srdivacky EmitLValue(E->getBase()); 581199990Srdivacky return llvm::ConstantInt::get(VMContext, Result.Val.getInt()); 582199990Srdivacky } 583199990Srdivacky return EmitLoadOfLValue(E); 584199990Srdivacky} 585193326Sed 586193326SedValue *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 587193326Sed TestAndClearIgnoreResultAssign(); 588193326Sed 589193326Sed // Emit subscript expressions in rvalue context's. For most cases, this just 590193326Sed // loads the lvalue formed by the subscript expr. However, we have to be 591193326Sed // careful, because the base of a vector subscript is occasionally an rvalue, 592193326Sed // so we can't get it as an lvalue. 593193326Sed if (!E->getBase()->getType()->isVectorType()) 594193326Sed return EmitLoadOfLValue(E); 595198092Srdivacky 596193326Sed // Handle the vector case. The base must be a vector, the index must be an 597193326Sed // integer value. 598193326Sed Value *Base = Visit(E->getBase()); 599193326Sed Value *Idx = Visit(E->getIdx()); 600193326Sed bool IdxSigned = E->getIdx()->getType()->isSignedIntegerType(); 601198092Srdivacky Idx = Builder.CreateIntCast(Idx, 602198092Srdivacky llvm::Type::getInt32Ty(CGF.getLLVMContext()), 603198092Srdivacky IdxSigned, 604193326Sed "vecidxcast"); 605193326Sed return Builder.CreateExtractElement(Base, Idx, "vecext"); 606193326Sed} 607193326Sed 608198398Srdivackystatic llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx, 609198398Srdivacky unsigned Off, const llvm::Type *I32Ty) { 610198398Srdivacky int MV = SVI->getMaskValue(Idx); 611198398Srdivacky if (MV == -1) 612198398Srdivacky return llvm::UndefValue::get(I32Ty); 613198398Srdivacky return llvm::ConstantInt::get(I32Ty, Off+MV); 614198398Srdivacky} 615198398Srdivacky 616198398SrdivackyValue *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) { 617198398Srdivacky bool Ignore = TestAndClearIgnoreResultAssign(); 618198398Srdivacky (void)Ignore; 619198398Srdivacky assert (Ignore == false && "init list ignored"); 620198398Srdivacky unsigned NumInitElements = E->getNumInits(); 621198398Srdivacky 622198398Srdivacky if (E->hadArrayRangeDesignator()) 623198398Srdivacky CGF.ErrorUnsupported(E, "GNU array range designator extension"); 624198398Srdivacky 625198398Srdivacky const llvm::VectorType *VType = 626198398Srdivacky dyn_cast<llvm::VectorType>(ConvertType(E->getType())); 627198398Srdivacky 628198398Srdivacky // We have a scalar in braces. Just use the first element. 629198398Srdivacky if (!VType) 630198398Srdivacky return Visit(E->getInit(0)); 631198398Srdivacky 632198398Srdivacky unsigned ResElts = VType->getNumElements(); 633198398Srdivacky const llvm::Type *I32Ty = llvm::Type::getInt32Ty(CGF.getLLVMContext()); 634198398Srdivacky 635198398Srdivacky // Loop over initializers collecting the Value for each, and remembering 636198398Srdivacky // whether the source was swizzle (ExtVectorElementExpr). This will allow 637198398Srdivacky // us to fold the shuffle for the swizzle into the shuffle for the vector 638198398Srdivacky // initializer, since LLVM optimizers generally do not want to touch 639198398Srdivacky // shuffles. 640198398Srdivacky unsigned CurIdx = 0; 641198398Srdivacky bool VIsUndefShuffle = false; 642198398Srdivacky llvm::Value *V = llvm::UndefValue::get(VType); 643198398Srdivacky for (unsigned i = 0; i != NumInitElements; ++i) { 644198398Srdivacky Expr *IE = E->getInit(i); 645198398Srdivacky Value *Init = Visit(IE); 646198398Srdivacky llvm::SmallVector<llvm::Constant*, 16> Args; 647198398Srdivacky 648198398Srdivacky const llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType()); 649198398Srdivacky 650198398Srdivacky // Handle scalar elements. If the scalar initializer is actually one 651198398Srdivacky // element of a different vector of the same width, use shuffle instead of 652198398Srdivacky // extract+insert. 653198398Srdivacky if (!VVT) { 654198398Srdivacky if (isa<ExtVectorElementExpr>(IE)) { 655198398Srdivacky llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init); 656198398Srdivacky 657198398Srdivacky if (EI->getVectorOperandType()->getNumElements() == ResElts) { 658198398Srdivacky llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand()); 659198398Srdivacky Value *LHS = 0, *RHS = 0; 660198398Srdivacky if (CurIdx == 0) { 661198398Srdivacky // insert into undef -> shuffle (src, undef) 662198398Srdivacky Args.push_back(C); 663198398Srdivacky for (unsigned j = 1; j != ResElts; ++j) 664198398Srdivacky Args.push_back(llvm::UndefValue::get(I32Ty)); 665198398Srdivacky 666198398Srdivacky LHS = EI->getVectorOperand(); 667198398Srdivacky RHS = V; 668198398Srdivacky VIsUndefShuffle = true; 669198398Srdivacky } else if (VIsUndefShuffle) { 670198398Srdivacky // insert into undefshuffle && size match -> shuffle (v, src) 671198398Srdivacky llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V); 672198398Srdivacky for (unsigned j = 0; j != CurIdx; ++j) 673198398Srdivacky Args.push_back(getMaskElt(SVV, j, 0, I32Ty)); 674198398Srdivacky Args.push_back(llvm::ConstantInt::get(I32Ty, 675198398Srdivacky ResElts + C->getZExtValue())); 676198398Srdivacky for (unsigned j = CurIdx + 1; j != ResElts; ++j) 677198398Srdivacky Args.push_back(llvm::UndefValue::get(I32Ty)); 678198398Srdivacky 679198398Srdivacky LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0); 680198398Srdivacky RHS = EI->getVectorOperand(); 681198398Srdivacky VIsUndefShuffle = false; 682198398Srdivacky } 683198398Srdivacky if (!Args.empty()) { 684198398Srdivacky llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts); 685198398Srdivacky V = Builder.CreateShuffleVector(LHS, RHS, Mask); 686198398Srdivacky ++CurIdx; 687198398Srdivacky continue; 688198398Srdivacky } 689198398Srdivacky } 690198398Srdivacky } 691198398Srdivacky Value *Idx = llvm::ConstantInt::get(I32Ty, CurIdx); 692198398Srdivacky V = Builder.CreateInsertElement(V, Init, Idx, "vecinit"); 693198398Srdivacky VIsUndefShuffle = false; 694198398Srdivacky ++CurIdx; 695198398Srdivacky continue; 696198398Srdivacky } 697198398Srdivacky 698198398Srdivacky unsigned InitElts = VVT->getNumElements(); 699198398Srdivacky 700198398Srdivacky // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's 701198398Srdivacky // input is the same width as the vector being constructed, generate an 702198398Srdivacky // optimized shuffle of the swizzle input into the result. 703198893Srdivacky unsigned Offset = (CurIdx == 0) ? 0 : ResElts; 704198398Srdivacky if (isa<ExtVectorElementExpr>(IE)) { 705198398Srdivacky llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init); 706198398Srdivacky Value *SVOp = SVI->getOperand(0); 707198398Srdivacky const llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType()); 708198398Srdivacky 709198398Srdivacky if (OpTy->getNumElements() == ResElts) { 710198398Srdivacky for (unsigned j = 0; j != CurIdx; ++j) { 711198398Srdivacky // If the current vector initializer is a shuffle with undef, merge 712198398Srdivacky // this shuffle directly into it. 713198398Srdivacky if (VIsUndefShuffle) { 714198398Srdivacky Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0, 715198398Srdivacky I32Ty)); 716198398Srdivacky } else { 717198398Srdivacky Args.push_back(llvm::ConstantInt::get(I32Ty, j)); 718198398Srdivacky } 719198398Srdivacky } 720198398Srdivacky for (unsigned j = 0, je = InitElts; j != je; ++j) 721198398Srdivacky Args.push_back(getMaskElt(SVI, j, Offset, I32Ty)); 722198398Srdivacky for (unsigned j = CurIdx + InitElts; j != ResElts; ++j) 723198398Srdivacky Args.push_back(llvm::UndefValue::get(I32Ty)); 724198398Srdivacky 725198398Srdivacky if (VIsUndefShuffle) 726198398Srdivacky V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0); 727198398Srdivacky 728198398Srdivacky Init = SVOp; 729198398Srdivacky } 730198398Srdivacky } 731198398Srdivacky 732198398Srdivacky // Extend init to result vector length, and then shuffle its contribution 733198398Srdivacky // to the vector initializer into V. 734198398Srdivacky if (Args.empty()) { 735198398Srdivacky for (unsigned j = 0; j != InitElts; ++j) 736198398Srdivacky Args.push_back(llvm::ConstantInt::get(I32Ty, j)); 737198398Srdivacky for (unsigned j = InitElts; j != ResElts; ++j) 738198398Srdivacky Args.push_back(llvm::UndefValue::get(I32Ty)); 739198398Srdivacky llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts); 740198398Srdivacky Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT), 741198893Srdivacky Mask, "vext"); 742198398Srdivacky 743198398Srdivacky Args.clear(); 744198398Srdivacky for (unsigned j = 0; j != CurIdx; ++j) 745198398Srdivacky Args.push_back(llvm::ConstantInt::get(I32Ty, j)); 746198398Srdivacky for (unsigned j = 0; j != InitElts; ++j) 747198893Srdivacky Args.push_back(llvm::ConstantInt::get(I32Ty, j+Offset)); 748198398Srdivacky for (unsigned j = CurIdx + InitElts; j != ResElts; ++j) 749198398Srdivacky Args.push_back(llvm::UndefValue::get(I32Ty)); 750198398Srdivacky } 751198398Srdivacky 752198398Srdivacky // If V is undef, make sure it ends up on the RHS of the shuffle to aid 753198398Srdivacky // merging subsequent shuffles into this one. 754198398Srdivacky if (CurIdx == 0) 755198398Srdivacky std::swap(V, Init); 756198398Srdivacky llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts); 757198398Srdivacky V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit"); 758198398Srdivacky VIsUndefShuffle = isa<llvm::UndefValue>(Init); 759198398Srdivacky CurIdx += InitElts; 760198398Srdivacky } 761198398Srdivacky 762198398Srdivacky // FIXME: evaluate codegen vs. shuffling against constant null vector. 763198398Srdivacky // Emit remaining default initializers. 764198398Srdivacky const llvm::Type *EltTy = VType->getElementType(); 765198398Srdivacky 766198398Srdivacky // Emit remaining default initializers 767198398Srdivacky for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) { 768198398Srdivacky Value *Idx = llvm::ConstantInt::get(I32Ty, CurIdx); 769198398Srdivacky llvm::Value *Init = llvm::Constant::getNullValue(EltTy); 770198398Srdivacky V = Builder.CreateInsertElement(V, Init, Idx, "vecinit"); 771198398Srdivacky } 772198398Srdivacky return V; 773198398Srdivacky} 774198398Srdivacky 775199990Srdivackystatic bool ShouldNullCheckClassCastValue(const CastExpr *CE) { 776199990Srdivacky const Expr *E = CE->getSubExpr(); 777199990Srdivacky 778199990Srdivacky if (isa<CXXThisExpr>(E)) { 779199990Srdivacky // We always assume that 'this' is never null. 780199990Srdivacky return false; 781199990Srdivacky } 782199990Srdivacky 783199990Srdivacky if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) { 784199990Srdivacky // And that lvalue casts are never null. 785199990Srdivacky if (ICE->isLvalueCast()) 786199990Srdivacky return false; 787199990Srdivacky } 788199990Srdivacky 789199990Srdivacky return true; 790199990Srdivacky} 791199990Srdivacky 792198092Srdivacky// VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts 793198092Srdivacky// have to handle a more broad range of conversions than explicit casts, as they 794198092Srdivacky// handle things like function to ptr-to-function decay etc. 795199990SrdivackyValue *ScalarExprEmitter::EmitCastExpr(CastExpr *CE) { 796199990Srdivacky Expr *E = CE->getSubExpr(); 797198092Srdivacky QualType DestTy = CE->getType(); 798198092Srdivacky CastExpr::CastKind Kind = CE->getCastKind(); 799193326Sed 800198092Srdivacky if (!DestTy->isVoidType()) 801198092Srdivacky TestAndClearIgnoreResultAssign(); 802193326Sed 803199990Srdivacky // Since almost all cast kinds apply to scalars, this switch doesn't have 804199990Srdivacky // a default case, so the compiler will warn on a missing case. The cases 805199990Srdivacky // are in the same order as in the CastKind enum. 806198092Srdivacky switch (Kind) { 807198092Srdivacky case CastExpr::CK_Unknown: 808199990Srdivacky // FIXME: All casts should have a known kind! 809199482Srdivacky //assert(0 && "Unknown cast kind!"); 810198092Srdivacky break; 811199482Srdivacky 812200583Srdivacky case CastExpr::CK_AnyPointerToObjCPointerCast: 813200583Srdivacky case CastExpr::CK_AnyPointerToBlockPointerCast: 814198092Srdivacky case CastExpr::CK_BitCast: { 815198092Srdivacky Value *Src = Visit(const_cast<Expr*>(E)); 816198092Srdivacky return Builder.CreateBitCast(Src, ConvertType(DestTy)); 817198092Srdivacky } 818199482Srdivacky case CastExpr::CK_NoOp: 819201361Srdivacky case CastExpr::CK_UserDefinedConversion: 820199482Srdivacky return Visit(const_cast<Expr*>(E)); 821198092Srdivacky 822199990Srdivacky case CastExpr::CK_BaseToDerived: { 823199990Srdivacky const CXXRecordDecl *BaseClassDecl = 824199990Srdivacky E->getType()->getCXXRecordDeclForPointerType(); 825199990Srdivacky const CXXRecordDecl *DerivedClassDecl = 826199990Srdivacky DestTy->getCXXRecordDeclForPointerType(); 827199990Srdivacky 828199990Srdivacky Value *Src = Visit(const_cast<Expr*>(E)); 829199990Srdivacky 830199990Srdivacky bool NullCheckValue = ShouldNullCheckClassCastValue(CE); 831199990Srdivacky return CGF.GetAddressOfDerivedClass(Src, BaseClassDecl, DerivedClassDecl, 832199990Srdivacky NullCheckValue); 833199990Srdivacky } 834198092Srdivacky case CastExpr::CK_DerivedToBase: { 835198092Srdivacky const RecordType *DerivedClassTy = 836198092Srdivacky E->getType()->getAs<PointerType>()->getPointeeType()->getAs<RecordType>(); 837198092Srdivacky CXXRecordDecl *DerivedClassDecl = 838198092Srdivacky cast<CXXRecordDecl>(DerivedClassTy->getDecl()); 839193326Sed 840198092Srdivacky const RecordType *BaseClassTy = 841198092Srdivacky DestTy->getAs<PointerType>()->getPointeeType()->getAs<RecordType>(); 842198092Srdivacky CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseClassTy->getDecl()); 843198092Srdivacky 844198092Srdivacky Value *Src = Visit(const_cast<Expr*>(E)); 845193326Sed 846199990Srdivacky bool NullCheckValue = ShouldNullCheckClassCastValue(CE); 847199990Srdivacky return CGF.GetAddressOfBaseClass(Src, DerivedClassDecl, BaseClassDecl, 848199990Srdivacky NullCheckValue); 849198092Srdivacky } 850199990Srdivacky case CastExpr::CK_Dynamic: { 851199990Srdivacky Value *V = Visit(const_cast<Expr*>(E)); 852199990Srdivacky const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE); 853199990Srdivacky return CGF.EmitDynamicCast(V, DCE); 854199990Srdivacky } 855199990Srdivacky case CastExpr::CK_ToUnion: 856199482Srdivacky assert(0 && "Should be unreachable!"); 857199482Srdivacky break; 858199990Srdivacky 859199482Srdivacky case CastExpr::CK_ArrayToPointerDecay: { 860199482Srdivacky assert(E->getType()->isArrayType() && 861199482Srdivacky "Array to pointer decay must have array source type!"); 862193326Sed 863199482Srdivacky Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays. 864199482Srdivacky 865199482Srdivacky // Note that VLA pointers are always decayed, so we don't need to do 866199482Srdivacky // anything here. 867199482Srdivacky if (!E->getType()->isVariableArrayType()) { 868199482Srdivacky assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer"); 869199482Srdivacky assert(isa<llvm::ArrayType>(cast<llvm::PointerType>(V->getType()) 870199482Srdivacky ->getElementType()) && 871199482Srdivacky "Expected pointer to array"); 872199482Srdivacky V = Builder.CreateStructGEP(V, 0, "arraydecay"); 873199482Srdivacky } 874199482Srdivacky 875199482Srdivacky return V; 876199482Srdivacky } 877199482Srdivacky case CastExpr::CK_FunctionToPointerDecay: 878199482Srdivacky return EmitLValue(E).getAddress(); 879199482Srdivacky 880199482Srdivacky case CastExpr::CK_NullToMemberPointer: 881199482Srdivacky return CGF.CGM.EmitNullConstant(DestTy); 882199482Srdivacky 883199990Srdivacky case CastExpr::CK_BaseToDerivedMemberPointer: 884199990Srdivacky case CastExpr::CK_DerivedToBaseMemberPointer: { 885199990Srdivacky Value *Src = Visit(E); 886199990Srdivacky 887199990Srdivacky // See if we need to adjust the pointer. 888199990Srdivacky const CXXRecordDecl *BaseDecl = 889199990Srdivacky cast<CXXRecordDecl>(E->getType()->getAs<MemberPointerType>()-> 890199990Srdivacky getClass()->getAs<RecordType>()->getDecl()); 891199990Srdivacky const CXXRecordDecl *DerivedDecl = 892199990Srdivacky cast<CXXRecordDecl>(CE->getType()->getAs<MemberPointerType>()-> 893199990Srdivacky getClass()->getAs<RecordType>()->getDecl()); 894199990Srdivacky if (CE->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 895199990Srdivacky std::swap(DerivedDecl, BaseDecl); 896199990Srdivacky 897199990Srdivacky llvm::Constant *Adj = CGF.CGM.GetCXXBaseClassOffset(DerivedDecl, BaseDecl); 898199990Srdivacky if (Adj) { 899199990Srdivacky if (CE->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 900199990Srdivacky Src = Builder.CreateSub(Src, Adj, "adj"); 901199990Srdivacky else 902199990Srdivacky Src = Builder.CreateAdd(Src, Adj, "adj"); 903199990Srdivacky } 904199990Srdivacky return Src; 905199990Srdivacky } 906199990Srdivacky 907199990Srdivacky case CastExpr::CK_ConstructorConversion: 908199990Srdivacky assert(0 && "Should be unreachable!"); 909199990Srdivacky break; 910199990Srdivacky 911198092Srdivacky case CastExpr::CK_IntegralToPointer: { 912198092Srdivacky Value *Src = Visit(const_cast<Expr*>(E)); 913198398Srdivacky 914198398Srdivacky // First, convert to the correct width so that we control the kind of 915198398Srdivacky // extension. 916198398Srdivacky const llvm::Type *MiddleTy = 917198398Srdivacky llvm::IntegerType::get(VMContext, CGF.LLVMPointerWidth); 918198398Srdivacky bool InputSigned = E->getType()->isSignedIntegerType(); 919198398Srdivacky llvm::Value* IntResult = 920198398Srdivacky Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv"); 921198398Srdivacky 922198398Srdivacky return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy)); 923198092Srdivacky } 924198092Srdivacky case CastExpr::CK_PointerToIntegral: { 925198092Srdivacky Value *Src = Visit(const_cast<Expr*>(E)); 926198092Srdivacky return Builder.CreatePtrToInt(Src, ConvertType(DestTy)); 927198092Srdivacky } 928199482Srdivacky case CastExpr::CK_ToVoid: { 929199482Srdivacky CGF.EmitAnyExpr(E, 0, false, true); 930199482Srdivacky return 0; 931198092Srdivacky } 932199482Srdivacky case CastExpr::CK_VectorSplat: { 933199482Srdivacky const llvm::Type *DstTy = ConvertType(DestTy); 934199482Srdivacky Value *Elt = Visit(const_cast<Expr*>(E)); 935199482Srdivacky 936199482Srdivacky // Insert the element in element zero of an undef vector 937199482Srdivacky llvm::Value *UnV = llvm::UndefValue::get(DstTy); 938199482Srdivacky llvm::Value *Idx = 939199482Srdivacky llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 0); 940199482Srdivacky UnV = Builder.CreateInsertElement(UnV, Elt, Idx, "tmp"); 941199482Srdivacky 942199482Srdivacky // Splat the element across to all elements 943199482Srdivacky llvm::SmallVector<llvm::Constant*, 16> Args; 944199482Srdivacky unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements(); 945199482Srdivacky for (unsigned i = 0; i < NumElements; i++) 946199482Srdivacky Args.push_back(llvm::ConstantInt::get( 947199482Srdivacky llvm::Type::getInt32Ty(VMContext), 0)); 948199482Srdivacky 949199482Srdivacky llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], NumElements); 950199482Srdivacky llvm::Value *Yay = Builder.CreateShuffleVector(UnV, UnV, Mask, "splat"); 951199482Srdivacky return Yay; 952199482Srdivacky } 953199990Srdivacky case CastExpr::CK_IntegralCast: 954199990Srdivacky case CastExpr::CK_IntegralToFloating: 955199990Srdivacky case CastExpr::CK_FloatingToIntegral: 956199990Srdivacky case CastExpr::CK_FloatingCast: 957199990Srdivacky return EmitScalarConversion(Visit(E), E->getType(), DestTy); 958199482Srdivacky 959200583Srdivacky case CastExpr::CK_MemberPointerToBoolean: 960200583Srdivacky return CGF.EvaluateExprAsBool(E); 961199482Srdivacky } 962199482Srdivacky 963193326Sed // Handle cases where the source is an non-complex type. 964198092Srdivacky 965193326Sed if (!CGF.hasAggregateLLVMType(E->getType())) { 966193326Sed Value *Src = Visit(const_cast<Expr*>(E)); 967193326Sed 968193326Sed // Use EmitScalarConversion to perform the conversion. 969193326Sed return EmitScalarConversion(Src, E->getType(), DestTy); 970193326Sed } 971198092Srdivacky 972193326Sed if (E->getType()->isAnyComplexType()) { 973193326Sed // Handle cases where the source is a complex type. 974193326Sed bool IgnoreImag = true; 975193326Sed bool IgnoreImagAssign = true; 976193326Sed bool IgnoreReal = IgnoreResultAssign; 977193326Sed bool IgnoreRealAssign = IgnoreResultAssign; 978193326Sed if (DestTy->isBooleanType()) 979193326Sed IgnoreImagAssign = IgnoreImag = false; 980193326Sed else if (DestTy->isVoidType()) { 981193326Sed IgnoreReal = IgnoreImag = false; 982193326Sed IgnoreRealAssign = IgnoreImagAssign = true; 983193326Sed } 984193326Sed CodeGenFunction::ComplexPairTy V 985193326Sed = CGF.EmitComplexExpr(E, IgnoreReal, IgnoreImag, IgnoreRealAssign, 986193326Sed IgnoreImagAssign); 987193326Sed return EmitComplexToScalarConversion(V, E->getType(), DestTy); 988193326Sed } 989193326Sed 990193326Sed // Okay, this is a cast from an aggregate. It must be a cast to void. Just 991193326Sed // evaluate the result and return. 992193326Sed CGF.EmitAggExpr(E, 0, false, true); 993193326Sed return 0; 994193326Sed} 995193326Sed 996193326SedValue *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) { 997193326Sed return CGF.EmitCompoundStmt(*E->getSubStmt(), 998193326Sed !E->getType()->isVoidType()).getScalarVal(); 999193326Sed} 1000193326Sed 1001193326SedValue *ScalarExprEmitter::VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 1002198092Srdivacky llvm::Value *V = CGF.GetAddrOfBlockDecl(E); 1003198092Srdivacky if (E->getType().isObjCGCWeak()) 1004198092Srdivacky return CGF.CGM.getObjCRuntime().EmitObjCWeakRead(CGF, V); 1005199990Srdivacky return Builder.CreateLoad(V, "tmp"); 1006193326Sed} 1007193326Sed 1008193326Sed//===----------------------------------------------------------------------===// 1009193326Sed// Unary Operators 1010193326Sed//===----------------------------------------------------------------------===// 1011193326Sed 1012193326SedValue *ScalarExprEmitter::VisitPrePostIncDec(const UnaryOperator *E, 1013193326Sed bool isInc, bool isPre) { 1014193326Sed LValue LV = EmitLValue(E->getSubExpr()); 1015193326Sed QualType ValTy = E->getSubExpr()->getType(); 1016193326Sed Value *InVal = CGF.EmitLoadOfLValue(LV, ValTy).getScalarVal(); 1017198092Srdivacky 1018198092Srdivacky llvm::LLVMContext &VMContext = CGF.getLLVMContext(); 1019198092Srdivacky 1020193326Sed int AmountVal = isInc ? 1 : -1; 1021193326Sed 1022193326Sed if (ValTy->isPointerType() && 1023198092Srdivacky ValTy->getAs<PointerType>()->isVariableArrayType()) { 1024193326Sed // The amount of the addition/subtraction needs to account for the VLA size 1025193326Sed CGF.ErrorUnsupported(E, "VLA pointer inc/dec"); 1026193326Sed } 1027193326Sed 1028193326Sed Value *NextVal; 1029198092Srdivacky if (const llvm::PointerType *PT = 1030193326Sed dyn_cast<llvm::PointerType>(InVal->getType())) { 1031198092Srdivacky llvm::Constant *Inc = 1032198092Srdivacky llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), AmountVal); 1033193326Sed if (!isa<llvm::FunctionType>(PT->getElementType())) { 1034198092Srdivacky QualType PTEE = ValTy->getPointeeType(); 1035198092Srdivacky if (const ObjCInterfaceType *OIT = 1036198092Srdivacky dyn_cast<ObjCInterfaceType>(PTEE)) { 1037198092Srdivacky // Handle interface types, which are not represented with a concrete type. 1038198092Srdivacky int size = CGF.getContext().getTypeSize(OIT) / 8; 1039198092Srdivacky if (!isInc) 1040198092Srdivacky size = -size; 1041198092Srdivacky Inc = llvm::ConstantInt::get(Inc->getType(), size); 1042198092Srdivacky const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext); 1043198092Srdivacky InVal = Builder.CreateBitCast(InVal, i8Ty); 1044198092Srdivacky NextVal = Builder.CreateGEP(InVal, Inc, "add.ptr"); 1045198092Srdivacky llvm::Value *lhs = LV.getAddress(); 1046198092Srdivacky lhs = Builder.CreateBitCast(lhs, llvm::PointerType::getUnqual(i8Ty)); 1047198092Srdivacky LV = LValue::MakeAddr(lhs, CGF.MakeQualifiers(ValTy)); 1048198092Srdivacky } else 1049198092Srdivacky NextVal = Builder.CreateInBoundsGEP(InVal, Inc, "ptrincdec"); 1050193326Sed } else { 1051198092Srdivacky const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext); 1052193326Sed NextVal = Builder.CreateBitCast(InVal, i8Ty, "tmp"); 1053193326Sed NextVal = Builder.CreateGEP(NextVal, Inc, "ptrincdec"); 1054193326Sed NextVal = Builder.CreateBitCast(NextVal, InVal->getType()); 1055193326Sed } 1056198092Srdivacky } else if (InVal->getType() == llvm::Type::getInt1Ty(VMContext) && isInc) { 1057193326Sed // Bool++ is an interesting case, due to promotion rules, we get: 1058193326Sed // Bool++ -> Bool = Bool+1 -> Bool = (int)Bool+1 -> 1059193326Sed // Bool = ((int)Bool+1) != 0 1060193326Sed // An interesting aspect of this is that increment is always true. 1061193326Sed // Decrement does not have this property. 1062198092Srdivacky NextVal = llvm::ConstantInt::getTrue(VMContext); 1063194613Sed } else if (isa<llvm::IntegerType>(InVal->getType())) { 1064194613Sed NextVal = llvm::ConstantInt::get(InVal->getType(), AmountVal); 1065198092Srdivacky 1066198092Srdivacky // Signed integer overflow is undefined behavior. 1067198092Srdivacky if (ValTy->isSignedIntegerType()) 1068198092Srdivacky NextVal = Builder.CreateNSWAdd(InVal, NextVal, isInc ? "inc" : "dec"); 1069198092Srdivacky else 1070198092Srdivacky NextVal = Builder.CreateAdd(InVal, NextVal, isInc ? "inc" : "dec"); 1071193326Sed } else { 1072193326Sed // Add the inc/dec to the real part. 1073198092Srdivacky if (InVal->getType()->isFloatTy()) 1074198092Srdivacky NextVal = 1075198092Srdivacky llvm::ConstantFP::get(VMContext, 1076198092Srdivacky llvm::APFloat(static_cast<float>(AmountVal))); 1077198092Srdivacky else if (InVal->getType()->isDoubleTy()) 1078198092Srdivacky NextVal = 1079198092Srdivacky llvm::ConstantFP::get(VMContext, 1080198092Srdivacky llvm::APFloat(static_cast<double>(AmountVal))); 1081193326Sed else { 1082193326Sed llvm::APFloat F(static_cast<float>(AmountVal)); 1083193326Sed bool ignored; 1084193326Sed F.convert(CGF.Target.getLongDoubleFormat(), llvm::APFloat::rmTowardZero, 1085193326Sed &ignored); 1086198092Srdivacky NextVal = llvm::ConstantFP::get(VMContext, F); 1087193326Sed } 1088194613Sed NextVal = Builder.CreateFAdd(InVal, NextVal, isInc ? "inc" : "dec"); 1089193326Sed } 1090198092Srdivacky 1091193326Sed // Store the updated result through the lvalue. 1092193326Sed if (LV.isBitfield()) 1093193326Sed CGF.EmitStoreThroughBitfieldLValue(RValue::get(NextVal), LV, ValTy, 1094193326Sed &NextVal); 1095193326Sed else 1096193326Sed CGF.EmitStoreThroughLValue(RValue::get(NextVal), LV, ValTy); 1097193326Sed 1098193326Sed // If this is a postinc, return the value read from memory, otherwise use the 1099193326Sed // updated value. 1100193326Sed return isPre ? NextVal : InVal; 1101193326Sed} 1102193326Sed 1103193326Sed 1104193326SedValue *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) { 1105193326Sed TestAndClearIgnoreResultAssign(); 1106193326Sed Value *Op = Visit(E->getSubExpr()); 1107194613Sed if (Op->getType()->isFPOrFPVector()) 1108194613Sed return Builder.CreateFNeg(Op, "neg"); 1109193326Sed return Builder.CreateNeg(Op, "neg"); 1110193326Sed} 1111193326Sed 1112193326SedValue *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) { 1113193326Sed TestAndClearIgnoreResultAssign(); 1114193326Sed Value *Op = Visit(E->getSubExpr()); 1115193326Sed return Builder.CreateNot(Op, "neg"); 1116193326Sed} 1117193326Sed 1118193326SedValue *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) { 1119193326Sed // Compare operand to zero. 1120193326Sed Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr()); 1121198092Srdivacky 1122193326Sed // Invert value. 1123193326Sed // TODO: Could dynamically modify easy computations here. For example, if 1124193326Sed // the operand is an icmp ne, turn into icmp eq. 1125193326Sed BoolVal = Builder.CreateNot(BoolVal, "lnot"); 1126198092Srdivacky 1127193326Sed // ZExt result to the expr type. 1128193326Sed return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext"); 1129193326Sed} 1130193326Sed 1131193326Sed/// VisitSizeOfAlignOfExpr - Return the size or alignment of the type of 1132193326Sed/// argument of the sizeof expression as an integer. 1133193326SedValue * 1134193326SedScalarExprEmitter::VisitSizeOfAlignOfExpr(const SizeOfAlignOfExpr *E) { 1135193326Sed QualType TypeToSize = E->getTypeOfArgument(); 1136193326Sed if (E->isSizeOf()) { 1137198092Srdivacky if (const VariableArrayType *VAT = 1138193326Sed CGF.getContext().getAsVariableArrayType(TypeToSize)) { 1139193326Sed if (E->isArgumentType()) { 1140193326Sed // sizeof(type) - make sure to emit the VLA size. 1141193326Sed CGF.EmitVLASize(TypeToSize); 1142193326Sed } else { 1143193326Sed // C99 6.5.3.4p2: If the argument is an expression of type 1144193326Sed // VLA, it is evaluated. 1145193326Sed CGF.EmitAnyExpr(E->getArgumentExpr()); 1146193326Sed } 1147198092Srdivacky 1148193326Sed return CGF.GetVLASize(VAT); 1149193326Sed } 1150193326Sed } 1151193326Sed 1152198092Srdivacky // If this isn't sizeof(vla), the result must be constant; use the constant 1153198092Srdivacky // folding logic so we don't have to duplicate it here. 1154193326Sed Expr::EvalResult Result; 1155193326Sed E->Evaluate(Result, CGF.getContext()); 1156198092Srdivacky return llvm::ConstantInt::get(VMContext, Result.Val.getInt()); 1157193326Sed} 1158193326Sed 1159193326SedValue *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) { 1160193326Sed Expr *Op = E->getSubExpr(); 1161193326Sed if (Op->getType()->isAnyComplexType()) 1162193326Sed return CGF.EmitComplexExpr(Op, false, true, false, true).first; 1163193326Sed return Visit(Op); 1164193326Sed} 1165193326SedValue *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) { 1166193326Sed Expr *Op = E->getSubExpr(); 1167193326Sed if (Op->getType()->isAnyComplexType()) 1168193326Sed return CGF.EmitComplexExpr(Op, true, false, true, false).second; 1169198092Srdivacky 1170193326Sed // __imag on a scalar returns zero. Emit the subexpr to ensure side 1171193326Sed // effects are evaluated, but not the actual value. 1172193326Sed if (E->isLvalue(CGF.getContext()) == Expr::LV_Valid) 1173193326Sed CGF.EmitLValue(Op); 1174193326Sed else 1175193326Sed CGF.EmitScalarExpr(Op, true); 1176193326Sed return llvm::Constant::getNullValue(ConvertType(E->getType())); 1177193326Sed} 1178193326Sed 1179198092SrdivackyValue *ScalarExprEmitter::VisitUnaryOffsetOf(const UnaryOperator *E) { 1180193326Sed Value* ResultAsPtr = EmitLValue(E->getSubExpr()).getAddress(); 1181193326Sed const llvm::Type* ResultType = ConvertType(E->getType()); 1182193326Sed return Builder.CreatePtrToInt(ResultAsPtr, ResultType, "offsetof"); 1183193326Sed} 1184193326Sed 1185193326Sed//===----------------------------------------------------------------------===// 1186193326Sed// Binary Operators 1187193326Sed//===----------------------------------------------------------------------===// 1188193326Sed 1189193326SedBinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) { 1190193326Sed TestAndClearIgnoreResultAssign(); 1191193326Sed BinOpInfo Result; 1192193326Sed Result.LHS = Visit(E->getLHS()); 1193193326Sed Result.RHS = Visit(E->getRHS()); 1194193326Sed Result.Ty = E->getType(); 1195193326Sed Result.E = E; 1196193326Sed return Result; 1197193326Sed} 1198193326Sed 1199193326SedValue *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E, 1200193326Sed Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) { 1201193326Sed bool Ignore = TestAndClearIgnoreResultAssign(); 1202201361Srdivacky QualType LHSTy = E->getLHS()->getType(); 1203193326Sed 1204193326Sed BinOpInfo OpInfo; 1205193326Sed 1206193326Sed if (E->getComputationResultType()->isAnyComplexType()) { 1207198092Srdivacky // This needs to go through the complex expression emitter, but it's a tad 1208198092Srdivacky // complicated to do that... I'm leaving it out for now. (Note that we do 1209198092Srdivacky // actually need the imaginary part of the RHS for multiplication and 1210198092Srdivacky // division.) 1211193326Sed CGF.ErrorUnsupported(E, "complex compound assignment"); 1212193326Sed return llvm::UndefValue::get(CGF.ConvertType(E->getType())); 1213193326Sed } 1214193326Sed 1215193326Sed // Emit the RHS first. __block variables need to have the rhs evaluated 1216193326Sed // first, plus this should improve codegen a little. 1217193326Sed OpInfo.RHS = Visit(E->getRHS()); 1218193326Sed OpInfo.Ty = E->getComputationResultType(); 1219193326Sed OpInfo.E = E; 1220193326Sed // Load/convert the LHS. 1221201361Srdivacky LValue LHSLV = EmitCheckedLValue(E->getLHS()); 1222193326Sed OpInfo.LHS = EmitLoadOfLValue(LHSLV, LHSTy); 1223193326Sed OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy, 1224193326Sed E->getComputationLHSType()); 1225198092Srdivacky 1226193326Sed // Expand the binary operator. 1227193326Sed Value *Result = (this->*Func)(OpInfo); 1228198092Srdivacky 1229193326Sed // Convert the result back to the LHS type. 1230193326Sed Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy); 1231193326Sed 1232198092Srdivacky // Store the result value into the LHS lvalue. Bit-fields are handled 1233198092Srdivacky // specially because the result is altered by the store, i.e., [C99 6.5.16p1] 1234198092Srdivacky // 'An assignment expression has the value of the left operand after the 1235198092Srdivacky // assignment...'. 1236193326Sed if (LHSLV.isBitfield()) { 1237193326Sed if (!LHSLV.isVolatileQualified()) { 1238193326Sed CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, LHSTy, 1239193326Sed &Result); 1240193326Sed return Result; 1241193326Sed } else 1242193326Sed CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, LHSTy); 1243193326Sed } else 1244193326Sed CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV, LHSTy); 1245193326Sed if (Ignore) 1246193326Sed return 0; 1247193326Sed return EmitLoadOfLValue(LHSLV, E->getType()); 1248193326Sed} 1249193326Sed 1250193326Sed 1251193326SedValue *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) { 1252193326Sed if (Ops.LHS->getType()->isFPOrFPVector()) 1253193326Sed return Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div"); 1254193326Sed else if (Ops.Ty->isUnsignedIntegerType()) 1255193326Sed return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div"); 1256193326Sed else 1257193326Sed return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div"); 1258193326Sed} 1259193326Sed 1260193326SedValue *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) { 1261193326Sed // Rem in C can't be a floating point type: C99 6.5.5p2. 1262193326Sed if (Ops.Ty->isUnsignedIntegerType()) 1263193326Sed return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem"); 1264193326Sed else 1265193326Sed return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem"); 1266193326Sed} 1267193326Sed 1268193326SedValue *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) { 1269193326Sed unsigned IID; 1270193326Sed unsigned OpID = 0; 1271193326Sed 1272193326Sed switch (Ops.E->getOpcode()) { 1273193326Sed case BinaryOperator::Add: 1274193326Sed case BinaryOperator::AddAssign: 1275193326Sed OpID = 1; 1276193326Sed IID = llvm::Intrinsic::sadd_with_overflow; 1277193326Sed break; 1278193326Sed case BinaryOperator::Sub: 1279193326Sed case BinaryOperator::SubAssign: 1280193326Sed OpID = 2; 1281193326Sed IID = llvm::Intrinsic::ssub_with_overflow; 1282193326Sed break; 1283193326Sed case BinaryOperator::Mul: 1284193326Sed case BinaryOperator::MulAssign: 1285193326Sed OpID = 3; 1286193326Sed IID = llvm::Intrinsic::smul_with_overflow; 1287193326Sed break; 1288193326Sed default: 1289193326Sed assert(false && "Unsupported operation for overflow detection"); 1290193326Sed IID = 0; 1291193326Sed } 1292193326Sed OpID <<= 1; 1293193326Sed OpID |= 1; 1294193326Sed 1295193326Sed const llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty); 1296193326Sed 1297193326Sed llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, &opTy, 1); 1298193326Sed 1299193326Sed Value *resultAndOverflow = Builder.CreateCall2(intrinsic, Ops.LHS, Ops.RHS); 1300193326Sed Value *result = Builder.CreateExtractValue(resultAndOverflow, 0); 1301193326Sed Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1); 1302193326Sed 1303193326Sed // Branch in case of overflow. 1304193326Sed llvm::BasicBlock *initialBB = Builder.GetInsertBlock(); 1305193326Sed llvm::BasicBlock *overflowBB = 1306193326Sed CGF.createBasicBlock("overflow", CGF.CurFn); 1307193326Sed llvm::BasicBlock *continueBB = 1308193326Sed CGF.createBasicBlock("overflow.continue", CGF.CurFn); 1309193326Sed 1310193326Sed Builder.CreateCondBr(overflow, overflowBB, continueBB); 1311193326Sed 1312193326Sed // Handle overflow 1313193326Sed 1314193326Sed Builder.SetInsertPoint(overflowBB); 1315193326Sed 1316193326Sed // Handler is: 1317198092Srdivacky // long long *__overflow_handler)(long long a, long long b, char op, 1318193326Sed // char width) 1319193326Sed std::vector<const llvm::Type*> handerArgTypes; 1320198092Srdivacky handerArgTypes.push_back(llvm::Type::getInt64Ty(VMContext)); 1321198092Srdivacky handerArgTypes.push_back(llvm::Type::getInt64Ty(VMContext)); 1322198092Srdivacky handerArgTypes.push_back(llvm::Type::getInt8Ty(VMContext)); 1323198092Srdivacky handerArgTypes.push_back(llvm::Type::getInt8Ty(VMContext)); 1324198092Srdivacky llvm::FunctionType *handlerTy = llvm::FunctionType::get( 1325198092Srdivacky llvm::Type::getInt64Ty(VMContext), handerArgTypes, false); 1326193326Sed llvm::Value *handlerFunction = 1327193326Sed CGF.CGM.getModule().getOrInsertGlobal("__overflow_handler", 1328193326Sed llvm::PointerType::getUnqual(handlerTy)); 1329193326Sed handlerFunction = Builder.CreateLoad(handlerFunction); 1330193326Sed 1331193326Sed llvm::Value *handlerResult = Builder.CreateCall4(handlerFunction, 1332198092Srdivacky Builder.CreateSExt(Ops.LHS, llvm::Type::getInt64Ty(VMContext)), 1333198092Srdivacky Builder.CreateSExt(Ops.RHS, llvm::Type::getInt64Ty(VMContext)), 1334198092Srdivacky llvm::ConstantInt::get(llvm::Type::getInt8Ty(VMContext), OpID), 1335198092Srdivacky llvm::ConstantInt::get(llvm::Type::getInt8Ty(VMContext), 1336193326Sed cast<llvm::IntegerType>(opTy)->getBitWidth())); 1337193326Sed 1338193326Sed handlerResult = Builder.CreateTrunc(handlerResult, opTy); 1339193326Sed 1340193326Sed Builder.CreateBr(continueBB); 1341198092Srdivacky 1342193326Sed // Set up the continuation 1343193326Sed Builder.SetInsertPoint(continueBB); 1344193326Sed // Get the correct result 1345193326Sed llvm::PHINode *phi = Builder.CreatePHI(opTy); 1346193326Sed phi->reserveOperandSpace(2); 1347193326Sed phi->addIncoming(result, initialBB); 1348193326Sed phi->addIncoming(handlerResult, overflowBB); 1349193326Sed 1350193326Sed return phi; 1351193326Sed} 1352193326Sed 1353193326SedValue *ScalarExprEmitter::EmitAdd(const BinOpInfo &Ops) { 1354198092Srdivacky if (!Ops.Ty->isAnyPointerType()) { 1355194613Sed if (CGF.getContext().getLangOptions().OverflowChecking && 1356194613Sed Ops.Ty->isSignedIntegerType()) 1357193326Sed return EmitOverflowCheckedBinOp(Ops); 1358198092Srdivacky 1359194613Sed if (Ops.LHS->getType()->isFPOrFPVector()) 1360194613Sed return Builder.CreateFAdd(Ops.LHS, Ops.RHS, "add"); 1361198092Srdivacky 1362198092Srdivacky // Signed integer overflow is undefined behavior. 1363198092Srdivacky if (Ops.Ty->isSignedIntegerType()) 1364198092Srdivacky return Builder.CreateNSWAdd(Ops.LHS, Ops.RHS, "add"); 1365198092Srdivacky 1366193326Sed return Builder.CreateAdd(Ops.LHS, Ops.RHS, "add"); 1367193326Sed } 1368193326Sed 1369198092Srdivacky if (Ops.Ty->isPointerType() && 1370198092Srdivacky Ops.Ty->getAs<PointerType>()->isVariableArrayType()) { 1371193326Sed // The amount of the addition needs to account for the VLA size 1372193326Sed CGF.ErrorUnsupported(Ops.E, "VLA pointer addition"); 1373193326Sed } 1374193326Sed Value *Ptr, *Idx; 1375193326Sed Expr *IdxExp; 1376198092Srdivacky const PointerType *PT = Ops.E->getLHS()->getType()->getAs<PointerType>(); 1377198092Srdivacky const ObjCObjectPointerType *OPT = 1378198092Srdivacky Ops.E->getLHS()->getType()->getAs<ObjCObjectPointerType>(); 1379198092Srdivacky if (PT || OPT) { 1380193326Sed Ptr = Ops.LHS; 1381193326Sed Idx = Ops.RHS; 1382193326Sed IdxExp = Ops.E->getRHS(); 1383198092Srdivacky } else { // int + pointer 1384198092Srdivacky PT = Ops.E->getRHS()->getType()->getAs<PointerType>(); 1385198092Srdivacky OPT = Ops.E->getRHS()->getType()->getAs<ObjCObjectPointerType>(); 1386198092Srdivacky assert((PT || OPT) && "Invalid add expr"); 1387193326Sed Ptr = Ops.RHS; 1388193326Sed Idx = Ops.LHS; 1389193326Sed IdxExp = Ops.E->getLHS(); 1390193326Sed } 1391193326Sed 1392193326Sed unsigned Width = cast<llvm::IntegerType>(Idx->getType())->getBitWidth(); 1393193326Sed if (Width < CGF.LLVMPointerWidth) { 1394193326Sed // Zero or sign extend the pointer value based on whether the index is 1395193326Sed // signed or not. 1396198092Srdivacky const llvm::Type *IdxType = 1397198092Srdivacky llvm::IntegerType::get(VMContext, CGF.LLVMPointerWidth); 1398193326Sed if (IdxExp->getType()->isSignedIntegerType()) 1399193326Sed Idx = Builder.CreateSExt(Idx, IdxType, "idx.ext"); 1400193326Sed else 1401193326Sed Idx = Builder.CreateZExt(Idx, IdxType, "idx.ext"); 1402193326Sed } 1403198092Srdivacky const QualType ElementType = PT ? PT->getPointeeType() : OPT->getPointeeType(); 1404198092Srdivacky // Handle interface types, which are not represented with a concrete type. 1405193326Sed if (const ObjCInterfaceType *OIT = dyn_cast<ObjCInterfaceType>(ElementType)) { 1406198092Srdivacky llvm::Value *InterfaceSize = 1407193326Sed llvm::ConstantInt::get(Idx->getType(), 1408193326Sed CGF.getContext().getTypeSize(OIT) / 8); 1409193326Sed Idx = Builder.CreateMul(Idx, InterfaceSize); 1410198092Srdivacky const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext); 1411193326Sed Value *Casted = Builder.CreateBitCast(Ptr, i8Ty); 1412193326Sed Value *Res = Builder.CreateGEP(Casted, Idx, "add.ptr"); 1413193326Sed return Builder.CreateBitCast(Res, Ptr->getType()); 1414198092Srdivacky } 1415193326Sed 1416198092Srdivacky // Explicitly handle GNU void* and function pointer arithmetic extensions. The 1417198092Srdivacky // GNU void* casts amount to no-ops since our void* type is i8*, but this is 1418198092Srdivacky // future proof. 1419193326Sed if (ElementType->isVoidType() || ElementType->isFunctionType()) { 1420198092Srdivacky const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext); 1421193326Sed Value *Casted = Builder.CreateBitCast(Ptr, i8Ty); 1422193326Sed Value *Res = Builder.CreateGEP(Casted, Idx, "add.ptr"); 1423193326Sed return Builder.CreateBitCast(Res, Ptr->getType()); 1424198092Srdivacky } 1425198092Srdivacky 1426198092Srdivacky return Builder.CreateInBoundsGEP(Ptr, Idx, "add.ptr"); 1427193326Sed} 1428193326Sed 1429193326SedValue *ScalarExprEmitter::EmitSub(const BinOpInfo &Ops) { 1430193326Sed if (!isa<llvm::PointerType>(Ops.LHS->getType())) { 1431193326Sed if (CGF.getContext().getLangOptions().OverflowChecking 1432193326Sed && Ops.Ty->isSignedIntegerType()) 1433193326Sed return EmitOverflowCheckedBinOp(Ops); 1434194613Sed 1435194613Sed if (Ops.LHS->getType()->isFPOrFPVector()) 1436194613Sed return Builder.CreateFSub(Ops.LHS, Ops.RHS, "sub"); 1437193326Sed return Builder.CreateSub(Ops.LHS, Ops.RHS, "sub"); 1438193326Sed } 1439193326Sed 1440198092Srdivacky if (Ops.E->getLHS()->getType()->isPointerType() && 1441198092Srdivacky Ops.E->getLHS()->getType()->getAs<PointerType>()->isVariableArrayType()) { 1442193326Sed // The amount of the addition needs to account for the VLA size for 1443193326Sed // ptr-int 1444193326Sed // The amount of the division needs to account for the VLA size for 1445193326Sed // ptr-ptr. 1446193326Sed CGF.ErrorUnsupported(Ops.E, "VLA pointer subtraction"); 1447193326Sed } 1448193326Sed 1449193326Sed const QualType LHSType = Ops.E->getLHS()->getType(); 1450198092Srdivacky const QualType LHSElementType = LHSType->getPointeeType(); 1451193326Sed if (!isa<llvm::PointerType>(Ops.RHS->getType())) { 1452193326Sed // pointer - int 1453193326Sed Value *Idx = Ops.RHS; 1454193326Sed unsigned Width = cast<llvm::IntegerType>(Idx->getType())->getBitWidth(); 1455193326Sed if (Width < CGF.LLVMPointerWidth) { 1456193326Sed // Zero or sign extend the pointer value based on whether the index is 1457193326Sed // signed or not. 1458198092Srdivacky const llvm::Type *IdxType = 1459198092Srdivacky llvm::IntegerType::get(VMContext, CGF.LLVMPointerWidth); 1460193326Sed if (Ops.E->getRHS()->getType()->isSignedIntegerType()) 1461193326Sed Idx = Builder.CreateSExt(Idx, IdxType, "idx.ext"); 1462193326Sed else 1463193326Sed Idx = Builder.CreateZExt(Idx, IdxType, "idx.ext"); 1464193326Sed } 1465193326Sed Idx = Builder.CreateNeg(Idx, "sub.ptr.neg"); 1466193326Sed 1467198092Srdivacky // Handle interface types, which are not represented with a concrete type. 1468198092Srdivacky if (const ObjCInterfaceType *OIT = 1469193326Sed dyn_cast<ObjCInterfaceType>(LHSElementType)) { 1470198092Srdivacky llvm::Value *InterfaceSize = 1471193326Sed llvm::ConstantInt::get(Idx->getType(), 1472193326Sed CGF.getContext().getTypeSize(OIT) / 8); 1473193326Sed Idx = Builder.CreateMul(Idx, InterfaceSize); 1474198092Srdivacky const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext); 1475193326Sed Value *LHSCasted = Builder.CreateBitCast(Ops.LHS, i8Ty); 1476193326Sed Value *Res = Builder.CreateGEP(LHSCasted, Idx, "add.ptr"); 1477193326Sed return Builder.CreateBitCast(Res, Ops.LHS->getType()); 1478198092Srdivacky } 1479193326Sed 1480193326Sed // Explicitly handle GNU void* and function pointer arithmetic 1481198092Srdivacky // extensions. The GNU void* casts amount to no-ops since our void* type is 1482198092Srdivacky // i8*, but this is future proof. 1483193326Sed if (LHSElementType->isVoidType() || LHSElementType->isFunctionType()) { 1484198092Srdivacky const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext); 1485193326Sed Value *LHSCasted = Builder.CreateBitCast(Ops.LHS, i8Ty); 1486193326Sed Value *Res = Builder.CreateGEP(LHSCasted, Idx, "sub.ptr"); 1487193326Sed return Builder.CreateBitCast(Res, Ops.LHS->getType()); 1488198092Srdivacky } 1489198092Srdivacky 1490198092Srdivacky return Builder.CreateInBoundsGEP(Ops.LHS, Idx, "sub.ptr"); 1491193326Sed } else { 1492193326Sed // pointer - pointer 1493193326Sed Value *LHS = Ops.LHS; 1494193326Sed Value *RHS = Ops.RHS; 1495198092Srdivacky 1496193326Sed uint64_t ElementSize; 1497193326Sed 1498193326Sed // Handle GCC extension for pointer arithmetic on void* and function pointer 1499193326Sed // types. 1500193326Sed if (LHSElementType->isVoidType() || LHSElementType->isFunctionType()) { 1501193326Sed ElementSize = 1; 1502193326Sed } else { 1503193326Sed ElementSize = CGF.getContext().getTypeSize(LHSElementType) / 8; 1504193326Sed } 1505198092Srdivacky 1506193326Sed const llvm::Type *ResultType = ConvertType(Ops.Ty); 1507193326Sed LHS = Builder.CreatePtrToInt(LHS, ResultType, "sub.ptr.lhs.cast"); 1508193326Sed RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast"); 1509193326Sed Value *BytesBetween = Builder.CreateSub(LHS, RHS, "sub.ptr.sub"); 1510198092Srdivacky 1511193326Sed // Optimize out the shift for element size of 1. 1512193326Sed if (ElementSize == 1) 1513193326Sed return BytesBetween; 1514198092Srdivacky 1515198092Srdivacky // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since 1516198092Srdivacky // pointer difference in C is only defined in the case where both operands 1517198092Srdivacky // are pointing to elements of an array. 1518193326Sed Value *BytesPerElt = llvm::ConstantInt::get(ResultType, ElementSize); 1519198092Srdivacky return Builder.CreateExactSDiv(BytesBetween, BytesPerElt, "sub.ptr.div"); 1520193326Sed } 1521193326Sed} 1522193326Sed 1523193326SedValue *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) { 1524193326Sed // LLVM requires the LHS and RHS to be the same type: promote or truncate the 1525193326Sed // RHS to the same size as the LHS. 1526193326Sed Value *RHS = Ops.RHS; 1527193326Sed if (Ops.LHS->getType() != RHS->getType()) 1528193326Sed RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); 1529198092Srdivacky 1530200583Srdivacky if (CGF.CatchUndefined 1531200583Srdivacky && isa<llvm::IntegerType>(Ops.LHS->getType())) { 1532200583Srdivacky unsigned Width = cast<llvm::IntegerType>(Ops.LHS->getType())->getBitWidth(); 1533200583Srdivacky llvm::BasicBlock *Cont = CGF.createBasicBlock("cont"); 1534200583Srdivacky CGF.Builder.CreateCondBr(Builder.CreateICmpULT(RHS, 1535200583Srdivacky llvm::ConstantInt::get(RHS->getType(), Width)), 1536200583Srdivacky Cont, CGF.getTrapBB()); 1537200583Srdivacky CGF.EmitBlock(Cont); 1538200583Srdivacky } 1539200583Srdivacky 1540193326Sed return Builder.CreateShl(Ops.LHS, RHS, "shl"); 1541193326Sed} 1542193326Sed 1543193326SedValue *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) { 1544193326Sed // LLVM requires the LHS and RHS to be the same type: promote or truncate the 1545193326Sed // RHS to the same size as the LHS. 1546193326Sed Value *RHS = Ops.RHS; 1547193326Sed if (Ops.LHS->getType() != RHS->getType()) 1548193326Sed RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); 1549198092Srdivacky 1550200583Srdivacky if (CGF.CatchUndefined 1551200583Srdivacky && isa<llvm::IntegerType>(Ops.LHS->getType())) { 1552200583Srdivacky unsigned Width = cast<llvm::IntegerType>(Ops.LHS->getType())->getBitWidth(); 1553200583Srdivacky llvm::BasicBlock *Cont = CGF.createBasicBlock("cont"); 1554200583Srdivacky CGF.Builder.CreateCondBr(Builder.CreateICmpULT(RHS, 1555200583Srdivacky llvm::ConstantInt::get(RHS->getType(), Width)), 1556200583Srdivacky Cont, CGF.getTrapBB()); 1557200583Srdivacky CGF.EmitBlock(Cont); 1558200583Srdivacky } 1559200583Srdivacky 1560193326Sed if (Ops.Ty->isUnsignedIntegerType()) 1561193326Sed return Builder.CreateLShr(Ops.LHS, RHS, "shr"); 1562193326Sed return Builder.CreateAShr(Ops.LHS, RHS, "shr"); 1563193326Sed} 1564193326Sed 1565193326SedValue *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc, 1566193326Sed unsigned SICmpOpc, unsigned FCmpOpc) { 1567193326Sed TestAndClearIgnoreResultAssign(); 1568193326Sed Value *Result; 1569193326Sed QualType LHSTy = E->getLHS()->getType(); 1570200583Srdivacky if (LHSTy->isMemberFunctionPointerType()) { 1571200583Srdivacky Value *LHSPtr = CGF.EmitAnyExprToTemp(E->getLHS()).getAggregateAddr(); 1572200583Srdivacky Value *RHSPtr = CGF.EmitAnyExprToTemp(E->getRHS()).getAggregateAddr(); 1573200583Srdivacky llvm::Value *LHSFunc = Builder.CreateStructGEP(LHSPtr, 0); 1574200583Srdivacky LHSFunc = Builder.CreateLoad(LHSFunc); 1575200583Srdivacky llvm::Value *RHSFunc = Builder.CreateStructGEP(RHSPtr, 0); 1576200583Srdivacky RHSFunc = Builder.CreateLoad(RHSFunc); 1577200583Srdivacky Value *ResultF = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 1578200583Srdivacky LHSFunc, RHSFunc, "cmp.func"); 1579200583Srdivacky Value *NullPtr = llvm::Constant::getNullValue(LHSFunc->getType()); 1580200583Srdivacky Value *ResultNull = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 1581200583Srdivacky LHSFunc, NullPtr, "cmp.null"); 1582200583Srdivacky llvm::Value *LHSAdj = Builder.CreateStructGEP(LHSPtr, 1); 1583200583Srdivacky LHSAdj = Builder.CreateLoad(LHSAdj); 1584200583Srdivacky llvm::Value *RHSAdj = Builder.CreateStructGEP(RHSPtr, 1); 1585200583Srdivacky RHSAdj = Builder.CreateLoad(RHSAdj); 1586200583Srdivacky Value *ResultA = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 1587200583Srdivacky LHSAdj, RHSAdj, "cmp.adj"); 1588200583Srdivacky if (E->getOpcode() == BinaryOperator::EQ) { 1589200583Srdivacky Result = Builder.CreateOr(ResultNull, ResultA, "or.na"); 1590200583Srdivacky Result = Builder.CreateAnd(Result, ResultF, "and.f"); 1591200583Srdivacky } else { 1592200583Srdivacky assert(E->getOpcode() == BinaryOperator::NE && 1593200583Srdivacky "Member pointer comparison other than == or != ?"); 1594200583Srdivacky Result = Builder.CreateAnd(ResultNull, ResultA, "and.na"); 1595200583Srdivacky Result = Builder.CreateOr(Result, ResultF, "or.f"); 1596200583Srdivacky } 1597200583Srdivacky } else if (!LHSTy->isAnyComplexType()) { 1598193326Sed Value *LHS = Visit(E->getLHS()); 1599193326Sed Value *RHS = Visit(E->getRHS()); 1600198092Srdivacky 1601198092Srdivacky if (LHS->getType()->isFPOrFPVector()) { 1602193326Sed Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc, 1603193326Sed LHS, RHS, "cmp"); 1604193326Sed } else if (LHSTy->isSignedIntegerType()) { 1605193326Sed Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc, 1606193326Sed LHS, RHS, "cmp"); 1607193326Sed } else { 1608193326Sed // Unsigned integers and pointers. 1609193326Sed Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 1610193326Sed LHS, RHS, "cmp"); 1611193326Sed } 1612198092Srdivacky 1613198092Srdivacky // If this is a vector comparison, sign extend the result to the appropriate 1614198092Srdivacky // vector integer type and return it (don't convert to bool). 1615198092Srdivacky if (LHSTy->isVectorType()) 1616198092Srdivacky return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext"); 1617198092Srdivacky 1618193326Sed } else { 1619193326Sed // Complex Comparison: can only be an equality comparison. 1620193326Sed CodeGenFunction::ComplexPairTy LHS = CGF.EmitComplexExpr(E->getLHS()); 1621193326Sed CodeGenFunction::ComplexPairTy RHS = CGF.EmitComplexExpr(E->getRHS()); 1622198092Srdivacky 1623198092Srdivacky QualType CETy = LHSTy->getAs<ComplexType>()->getElementType(); 1624198092Srdivacky 1625193326Sed Value *ResultR, *ResultI; 1626193326Sed if (CETy->isRealFloatingType()) { 1627193326Sed ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc, 1628193326Sed LHS.first, RHS.first, "cmp.r"); 1629193326Sed ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc, 1630193326Sed LHS.second, RHS.second, "cmp.i"); 1631193326Sed } else { 1632193326Sed // Complex comparisons can only be equality comparisons. As such, signed 1633193326Sed // and unsigned opcodes are the same. 1634193326Sed ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 1635193326Sed LHS.first, RHS.first, "cmp.r"); 1636193326Sed ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 1637193326Sed LHS.second, RHS.second, "cmp.i"); 1638193326Sed } 1639198092Srdivacky 1640193326Sed if (E->getOpcode() == BinaryOperator::EQ) { 1641193326Sed Result = Builder.CreateAnd(ResultR, ResultI, "and.ri"); 1642193326Sed } else { 1643193326Sed assert(E->getOpcode() == BinaryOperator::NE && 1644193326Sed "Complex comparison other than == or != ?"); 1645193326Sed Result = Builder.CreateOr(ResultR, ResultI, "or.ri"); 1646193326Sed } 1647193326Sed } 1648193326Sed 1649193326Sed return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType()); 1650193326Sed} 1651193326Sed 1652193326SedValue *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) { 1653193326Sed bool Ignore = TestAndClearIgnoreResultAssign(); 1654193326Sed 1655193326Sed // __block variables need to have the rhs evaluated first, plus this should 1656193326Sed // improve codegen just a little. 1657193326Sed Value *RHS = Visit(E->getRHS()); 1658201361Srdivacky LValue LHS = EmitCheckedLValue(E->getLHS()); 1659198092Srdivacky 1660193326Sed // Store the value into the LHS. Bit-fields are handled specially 1661193326Sed // because the result is altered by the store, i.e., [C99 6.5.16p1] 1662193326Sed // 'An assignment expression has the value of the left operand after 1663193326Sed // the assignment...'. 1664193326Sed if (LHS.isBitfield()) { 1665193326Sed if (!LHS.isVolatileQualified()) { 1666193326Sed CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, E->getType(), 1667193326Sed &RHS); 1668193326Sed return RHS; 1669193326Sed } else 1670193326Sed CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, E->getType()); 1671193326Sed } else 1672193326Sed CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS, E->getType()); 1673193326Sed if (Ignore) 1674193326Sed return 0; 1675193326Sed return EmitLoadOfLValue(LHS, E->getType()); 1676193326Sed} 1677193326Sed 1678193326SedValue *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) { 1679198398Srdivacky const llvm::Type *ResTy = ConvertType(E->getType()); 1680198398Srdivacky 1681193326Sed // If we have 0 && RHS, see if we can elide RHS, if so, just return 0. 1682193326Sed // If we have 1 && X, just emit X without inserting the control flow. 1683193326Sed if (int Cond = CGF.ConstantFoldsToSimpleInteger(E->getLHS())) { 1684193326Sed if (Cond == 1) { // If we have 1 && X, just emit X. 1685193326Sed Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); 1686198398Srdivacky // ZExt result to int or bool. 1687198398Srdivacky return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext"); 1688193326Sed } 1689198092Srdivacky 1690198398Srdivacky // 0 && RHS: If it is safe, just elide the RHS, and return 0/false. 1691193326Sed if (!CGF.ContainsLabel(E->getRHS())) 1692198398Srdivacky return llvm::Constant::getNullValue(ResTy); 1693193326Sed } 1694198092Srdivacky 1695193326Sed llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end"); 1696193326Sed llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs"); 1697193326Sed 1698193326Sed // Branch on the LHS first. If it is false, go to the failure (cont) block. 1699193326Sed CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock); 1700193326Sed 1701193326Sed // Any edges into the ContBlock are now from an (indeterminate number of) 1702193326Sed // edges from this first condition. All of these values will be false. Start 1703193326Sed // setting up the PHI node in the Cont Block for this. 1704198092Srdivacky llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 1705198092Srdivacky "", ContBlock); 1706193326Sed PN->reserveOperandSpace(2); // Normal case, two inputs. 1707193326Sed for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock); 1708193326Sed PI != PE; ++PI) 1709198092Srdivacky PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI); 1710198092Srdivacky 1711199990Srdivacky CGF.StartConditionalBranch(); 1712193326Sed CGF.EmitBlock(RHSBlock); 1713193326Sed Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); 1714199990Srdivacky CGF.FinishConditionalBranch(); 1715198092Srdivacky 1716193326Sed // Reaquire the RHS block, as there may be subblocks inserted. 1717193326Sed RHSBlock = Builder.GetInsertBlock(); 1718193326Sed 1719193326Sed // Emit an unconditional branch from this block to ContBlock. Insert an entry 1720193326Sed // into the phi node for the edge with the value of RHSCond. 1721193326Sed CGF.EmitBlock(ContBlock); 1722193326Sed PN->addIncoming(RHSCond, RHSBlock); 1723198092Srdivacky 1724193326Sed // ZExt result to int. 1725198398Srdivacky return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext"); 1726193326Sed} 1727193326Sed 1728193326SedValue *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) { 1729198398Srdivacky const llvm::Type *ResTy = ConvertType(E->getType()); 1730198398Srdivacky 1731193326Sed // If we have 1 || RHS, see if we can elide RHS, if so, just return 1. 1732193326Sed // If we have 0 || X, just emit X without inserting the control flow. 1733193326Sed if (int Cond = CGF.ConstantFoldsToSimpleInteger(E->getLHS())) { 1734193326Sed if (Cond == -1) { // If we have 0 || X, just emit X. 1735193326Sed Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); 1736198398Srdivacky // ZExt result to int or bool. 1737198398Srdivacky return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext"); 1738193326Sed } 1739198092Srdivacky 1740198398Srdivacky // 1 || RHS: If it is safe, just elide the RHS, and return 1/true. 1741193326Sed if (!CGF.ContainsLabel(E->getRHS())) 1742198398Srdivacky return llvm::ConstantInt::get(ResTy, 1); 1743193326Sed } 1744198092Srdivacky 1745193326Sed llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end"); 1746193326Sed llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs"); 1747198092Srdivacky 1748193326Sed // Branch on the LHS first. If it is true, go to the success (cont) block. 1749193326Sed CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock); 1750193326Sed 1751193326Sed // Any edges into the ContBlock are now from an (indeterminate number of) 1752193326Sed // edges from this first condition. All of these values will be true. Start 1753193326Sed // setting up the PHI node in the Cont Block for this. 1754198092Srdivacky llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 1755198092Srdivacky "", ContBlock); 1756193326Sed PN->reserveOperandSpace(2); // Normal case, two inputs. 1757193326Sed for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock); 1758193326Sed PI != PE; ++PI) 1759198092Srdivacky PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI); 1760193326Sed 1761199990Srdivacky CGF.StartConditionalBranch(); 1762193576Sed 1763193326Sed // Emit the RHS condition as a bool value. 1764193326Sed CGF.EmitBlock(RHSBlock); 1765193326Sed Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); 1766198092Srdivacky 1767199990Srdivacky CGF.FinishConditionalBranch(); 1768198092Srdivacky 1769193326Sed // Reaquire the RHS block, as there may be subblocks inserted. 1770193326Sed RHSBlock = Builder.GetInsertBlock(); 1771198092Srdivacky 1772193326Sed // Emit an unconditional branch from this block to ContBlock. Insert an entry 1773193326Sed // into the phi node for the edge with the value of RHSCond. 1774193326Sed CGF.EmitBlock(ContBlock); 1775193326Sed PN->addIncoming(RHSCond, RHSBlock); 1776198092Srdivacky 1777193326Sed // ZExt result to int. 1778198398Srdivacky return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext"); 1779193326Sed} 1780193326Sed 1781193326SedValue *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) { 1782193326Sed CGF.EmitStmt(E->getLHS()); 1783193326Sed CGF.EnsureInsertPoint(); 1784193326Sed return Visit(E->getRHS()); 1785193326Sed} 1786193326Sed 1787193326Sed//===----------------------------------------------------------------------===// 1788193326Sed// Other Operators 1789193326Sed//===----------------------------------------------------------------------===// 1790193326Sed 1791193326Sed/// isCheapEnoughToEvaluateUnconditionally - Return true if the specified 1792193326Sed/// expression is cheap enough and side-effect-free enough to evaluate 1793193326Sed/// unconditionally instead of conditionally. This is used to convert control 1794193326Sed/// flow into selects in some cases. 1795198893Srdivackystatic bool isCheapEnoughToEvaluateUnconditionally(const Expr *E, 1796198893Srdivacky CodeGenFunction &CGF) { 1797193326Sed if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) 1798198893Srdivacky return isCheapEnoughToEvaluateUnconditionally(PE->getSubExpr(), CGF); 1799198092Srdivacky 1800193326Sed // TODO: Allow anything we can constant fold to an integer or fp constant. 1801193326Sed if (isa<IntegerLiteral>(E) || isa<CharacterLiteral>(E) || 1802193326Sed isa<FloatingLiteral>(E)) 1803193326Sed return true; 1804198092Srdivacky 1805193326Sed // Non-volatile automatic variables too, to get "cond ? X : Y" where 1806193326Sed // X and Y are local variables. 1807193326Sed if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 1808193326Sed if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) 1809198893Srdivacky if (VD->hasLocalStorage() && !(CGF.getContext() 1810198893Srdivacky .getCanonicalType(VD->getType()) 1811198893Srdivacky .isVolatileQualified())) 1812193326Sed return true; 1813198092Srdivacky 1814193326Sed return false; 1815193326Sed} 1816193326Sed 1817193326Sed 1818193326SedValue *ScalarExprEmitter:: 1819193326SedVisitConditionalOperator(const ConditionalOperator *E) { 1820193326Sed TestAndClearIgnoreResultAssign(); 1821193326Sed // If the condition constant folds and can be elided, try to avoid emitting 1822193326Sed // the condition and the dead arm. 1823193326Sed if (int Cond = CGF.ConstantFoldsToSimpleInteger(E->getCond())){ 1824193326Sed Expr *Live = E->getLHS(), *Dead = E->getRHS(); 1825193326Sed if (Cond == -1) 1826193326Sed std::swap(Live, Dead); 1827198092Srdivacky 1828193326Sed // If the dead side doesn't have labels we need, and if the Live side isn't 1829193326Sed // the gnu missing ?: extension (which we could handle, but don't bother 1830193326Sed // to), just emit the Live part. 1831193326Sed if ((!Dead || !CGF.ContainsLabel(Dead)) && // No labels in dead part 1832193326Sed Live) // Live part isn't missing. 1833193326Sed return Visit(Live); 1834193326Sed } 1835198092Srdivacky 1836198092Srdivacky 1837193326Sed // If this is a really simple expression (like x ? 4 : 5), emit this as a 1838193326Sed // select instead of as control flow. We can only do this if it is cheap and 1839193326Sed // safe to evaluate the LHS and RHS unconditionally. 1840198893Srdivacky if (E->getLHS() && isCheapEnoughToEvaluateUnconditionally(E->getLHS(), 1841198893Srdivacky CGF) && 1842198893Srdivacky isCheapEnoughToEvaluateUnconditionally(E->getRHS(), CGF)) { 1843193326Sed llvm::Value *CondV = CGF.EvaluateExprAsBool(E->getCond()); 1844193326Sed llvm::Value *LHS = Visit(E->getLHS()); 1845193326Sed llvm::Value *RHS = Visit(E->getRHS()); 1846193326Sed return Builder.CreateSelect(CondV, LHS, RHS, "cond"); 1847193326Sed } 1848198092Srdivacky 1849198092Srdivacky 1850193326Sed llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 1851193326Sed llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 1852193326Sed llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 1853193326Sed Value *CondVal = 0; 1854193326Sed 1855198092Srdivacky // If we don't have the GNU missing condition extension, emit a branch on bool 1856198092Srdivacky // the normal way. 1857193326Sed if (E->getLHS()) { 1858193326Sed // Otherwise, just use EmitBranchOnBoolExpr to get small and simple code for 1859193326Sed // the branch on bool. 1860193326Sed CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 1861193326Sed } else { 1862193326Sed // Otherwise, for the ?: extension, evaluate the conditional and then 1863193326Sed // convert it to bool the hard way. We do this explicitly because we need 1864193326Sed // the unconverted value for the missing middle value of the ?:. 1865193326Sed CondVal = CGF.EmitScalarExpr(E->getCond()); 1866198092Srdivacky 1867193326Sed // In some cases, EmitScalarConversion will delete the "CondVal" expression 1868193326Sed // if there are no extra uses (an optimization). Inhibit this by making an 1869193326Sed // extra dead use, because we're going to add a use of CondVal later. We 1870193326Sed // don't use the builder for this, because we don't want it to get optimized 1871193326Sed // away. This leaves dead code, but the ?: extension isn't common. 1872193326Sed new llvm::BitCastInst(CondVal, CondVal->getType(), "dummy?:holder", 1873193326Sed Builder.GetInsertBlock()); 1874198092Srdivacky 1875193326Sed Value *CondBoolVal = 1876193326Sed CGF.EmitScalarConversion(CondVal, E->getCond()->getType(), 1877193326Sed CGF.getContext().BoolTy); 1878193326Sed Builder.CreateCondBr(CondBoolVal, LHSBlock, RHSBlock); 1879193326Sed } 1880193576Sed 1881199990Srdivacky CGF.StartConditionalBranch(); 1882193326Sed CGF.EmitBlock(LHSBlock); 1883198092Srdivacky 1884193326Sed // Handle the GNU extension for missing LHS. 1885193326Sed Value *LHS; 1886193326Sed if (E->getLHS()) 1887193326Sed LHS = Visit(E->getLHS()); 1888193326Sed else // Perform promotions, to handle cases like "short ?: int" 1889193326Sed LHS = EmitScalarConversion(CondVal, E->getCond()->getType(), E->getType()); 1890198092Srdivacky 1891199990Srdivacky CGF.FinishConditionalBranch(); 1892193326Sed LHSBlock = Builder.GetInsertBlock(); 1893193326Sed CGF.EmitBranch(ContBlock); 1894198092Srdivacky 1895199990Srdivacky CGF.StartConditionalBranch(); 1896193326Sed CGF.EmitBlock(RHSBlock); 1897198092Srdivacky 1898193326Sed Value *RHS = Visit(E->getRHS()); 1899199990Srdivacky CGF.FinishConditionalBranch(); 1900193326Sed RHSBlock = Builder.GetInsertBlock(); 1901193326Sed CGF.EmitBranch(ContBlock); 1902198092Srdivacky 1903193326Sed CGF.EmitBlock(ContBlock); 1904198092Srdivacky 1905200583Srdivacky // If the LHS or RHS is a throw expression, it will be legitimately null. 1906200583Srdivacky if (!LHS) 1907200583Srdivacky return RHS; 1908200583Srdivacky if (!RHS) 1909200583Srdivacky return LHS; 1910198092Srdivacky 1911193326Sed // Create a PHI node for the real part. 1912193326Sed llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), "cond"); 1913193326Sed PN->reserveOperandSpace(2); 1914193326Sed PN->addIncoming(LHS, LHSBlock); 1915193326Sed PN->addIncoming(RHS, RHSBlock); 1916193326Sed return PN; 1917193326Sed} 1918193326Sed 1919193326SedValue *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) { 1920193326Sed return Visit(E->getChosenSubExpr(CGF.getContext())); 1921193326Sed} 1922193326Sed 1923193326SedValue *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 1924193326Sed llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 1925193326Sed llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 1926193326Sed 1927193326Sed // If EmitVAArg fails, we fall back to the LLVM instruction. 1928198092Srdivacky if (!ArgPtr) 1929193326Sed return Builder.CreateVAArg(ArgValue, ConvertType(VE->getType())); 1930193326Sed 1931193326Sed // FIXME Volatility. 1932193326Sed return Builder.CreateLoad(ArgPtr); 1933193326Sed} 1934193326Sed 1935193326SedValue *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *BE) { 1936193326Sed return CGF.BuildBlockLiteralTmp(BE); 1937193326Sed} 1938193326Sed 1939193326Sed//===----------------------------------------------------------------------===// 1940193326Sed// Entry Point into this File 1941193326Sed//===----------------------------------------------------------------------===// 1942193326Sed 1943198092Srdivacky/// EmitScalarExpr - Emit the computation of the specified expression of scalar 1944198092Srdivacky/// type, ignoring the result. 1945193326SedValue *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) { 1946193326Sed assert(E && !hasAggregateLLVMType(E->getType()) && 1947193326Sed "Invalid scalar expression to emit"); 1948198092Srdivacky 1949193326Sed return ScalarExprEmitter(*this, IgnoreResultAssign) 1950193326Sed .Visit(const_cast<Expr*>(E)); 1951193326Sed} 1952193326Sed 1953193326Sed/// EmitScalarConversion - Emit a conversion from the specified type to the 1954193326Sed/// specified destination type, both of which are LLVM scalar types. 1955193326SedValue *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy, 1956193326Sed QualType DstTy) { 1957193326Sed assert(!hasAggregateLLVMType(SrcTy) && !hasAggregateLLVMType(DstTy) && 1958193326Sed "Invalid scalar expression to emit"); 1959193326Sed return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy); 1960193326Sed} 1961193326Sed 1962198092Srdivacky/// EmitComplexToScalarConversion - Emit a conversion from the specified complex 1963198092Srdivacky/// type to the specified destination type, where the destination type is an 1964198092Srdivacky/// LLVM scalar type. 1965193326SedValue *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src, 1966193326Sed QualType SrcTy, 1967193326Sed QualType DstTy) { 1968193326Sed assert(SrcTy->isAnyComplexType() && !hasAggregateLLVMType(DstTy) && 1969193326Sed "Invalid complex -> scalar conversion"); 1970193326Sed return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy, 1971193326Sed DstTy); 1972193326Sed} 1973193326Sed 1974193326SedValue *CodeGenFunction::EmitShuffleVector(Value* V1, Value *V2, ...) { 1975193326Sed assert(V1->getType() == V2->getType() && 1976193326Sed "Vector operands must be of the same type"); 1977198092Srdivacky unsigned NumElements = 1978193326Sed cast<llvm::VectorType>(V1->getType())->getNumElements(); 1979198092Srdivacky 1980193326Sed va_list va; 1981193326Sed va_start(va, V2); 1982198092Srdivacky 1983193326Sed llvm::SmallVector<llvm::Constant*, 16> Args; 1984193326Sed for (unsigned i = 0; i < NumElements; i++) { 1985193326Sed int n = va_arg(va, int); 1986198092Srdivacky assert(n >= 0 && n < (int)NumElements * 2 && 1987193326Sed "Vector shuffle index out of bounds!"); 1988198092Srdivacky Args.push_back(llvm::ConstantInt::get( 1989198092Srdivacky llvm::Type::getInt32Ty(VMContext), n)); 1990193326Sed } 1991198092Srdivacky 1992193326Sed const char *Name = va_arg(va, const char *); 1993193326Sed va_end(va); 1994198092Srdivacky 1995193326Sed llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], NumElements); 1996198092Srdivacky 1997193326Sed return Builder.CreateShuffleVector(V1, V2, Mask, Name); 1998193326Sed} 1999193326Sed 2000198092Srdivackyllvm::Value *CodeGenFunction::EmitVector(llvm::Value * const *Vals, 2001193326Sed unsigned NumVals, bool isSplat) { 2002193326Sed llvm::Value *Vec 2003193326Sed = llvm::UndefValue::get(llvm::VectorType::get(Vals[0]->getType(), NumVals)); 2004198092Srdivacky 2005193326Sed for (unsigned i = 0, e = NumVals; i != e; ++i) { 2006193326Sed llvm::Value *Val = isSplat ? Vals[0] : Vals[i]; 2007198092Srdivacky llvm::Value *Idx = llvm::ConstantInt::get( 2008198092Srdivacky llvm::Type::getInt32Ty(VMContext), i); 2009193326Sed Vec = Builder.CreateInsertElement(Vec, Val, Idx, "tmp"); 2010193326Sed } 2011198092Srdivacky 2012198092Srdivacky return Vec; 2013193326Sed} 2014200583Srdivacky 2015200583SrdivackyLValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) { 2016200583Srdivacky llvm::Value *V; 2017200583Srdivacky // object->isa or (*object).isa 2018200583Srdivacky // Generate code as for: *(Class*)object 2019200583Srdivacky Expr *BaseExpr = E->getBase(); 2020200583Srdivacky if (E->isArrow()) 2021200583Srdivacky V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr); 2022200583Srdivacky else 2023200583Srdivacky V = EmitLValue(BaseExpr).getAddress(); 2024200583Srdivacky 2025200583Srdivacky // build Class* type 2026200583Srdivacky const llvm::Type *ClassPtrTy = ConvertType(E->getType()); 2027200583Srdivacky ClassPtrTy = ClassPtrTy->getPointerTo(); 2028200583Srdivacky V = Builder.CreateBitCast(V, ClassPtrTy); 2029200583Srdivacky LValue LV = LValue::MakeAddr(V, MakeQualifiers(E->getType())); 2030200583Srdivacky return LV; 2031200583Srdivacky} 2032200583Srdivacky 2033