CGExprScalar.cpp revision 984d0b414bc76d3530b9bc55a5a55834ba76c607
1//===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This contains code to emit Expr nodes with scalar LLVM types as LLVM code. 11// 12//===----------------------------------------------------------------------===// 13 14#include "CodeGenFunction.h" 15#include "CodeGenModule.h" 16#include "clang/AST/AST.h" 17#include "llvm/Constants.h" 18#include "llvm/Function.h" 19#include "llvm/GlobalVariable.h" 20#include "llvm/Intrinsics.h" 21#include "llvm/Support/Compiler.h" 22#include <cstdarg> 23 24using namespace clang; 25using namespace CodeGen; 26using llvm::Value; 27 28//===----------------------------------------------------------------------===// 29// Scalar Expression Emitter 30//===----------------------------------------------------------------------===// 31 32struct BinOpInfo { 33 Value *LHS; 34 Value *RHS; 35 QualType Ty; // Computation Type. 36 const BinaryOperator *E; 37}; 38 39namespace { 40class VISIBILITY_HIDDEN ScalarExprEmitter 41 : public StmtVisitor<ScalarExprEmitter, Value*> { 42 CodeGenFunction &CGF; 43 llvm::LLVMFoldingBuilder &Builder; 44 CGObjCRuntime *Runtime; 45 46 47public: 48 49 ScalarExprEmitter(CodeGenFunction &cgf) : CGF(cgf), 50 Builder(CGF.Builder), 51 Runtime(CGF.CGM.getObjCRuntime()) { 52 } 53 54 //===--------------------------------------------------------------------===// 55 // Utilities 56 //===--------------------------------------------------------------------===// 57 58 const llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); } 59 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); } 60 61 Value *EmitLoadOfLValue(LValue LV, QualType T) { 62 return CGF.EmitLoadOfLValue(LV, T).getScalarVal(); 63 } 64 65 /// EmitLoadOfLValue - Given an expression with complex type that represents a 66 /// value l-value, this method emits the address of the l-value, then loads 67 /// and returns the result. 68 Value *EmitLoadOfLValue(const Expr *E) { 69 // FIXME: Volatile 70 return EmitLoadOfLValue(EmitLValue(E), E->getType()); 71 } 72 73 /// EmitConversionToBool - Convert the specified expression value to a 74 /// boolean (i1) truth value. This is equivalent to "Val != 0". 75 Value *EmitConversionToBool(Value *Src, QualType DstTy); 76 77 /// EmitScalarConversion - Emit a conversion from the specified type to the 78 /// specified destination type, both of which are LLVM scalar types. 79 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy); 80 81 /// EmitComplexToScalarConversion - Emit a conversion from the specified 82 /// complex type to the specified destination type, where the destination 83 /// type is an LLVM scalar type. 84 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src, 85 QualType SrcTy, QualType DstTy); 86 87 //===--------------------------------------------------------------------===// 88 // Visitor Methods 89 //===--------------------------------------------------------------------===// 90 91 Value *VisitStmt(Stmt *S) { 92 S->dump(CGF.getContext().getSourceManager()); 93 assert(0 && "Stmt can't have complex result type!"); 94 return 0; 95 } 96 Value *VisitExpr(Expr *S); 97 Value *VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr()); } 98 99 // Leaves. 100 Value *VisitIntegerLiteral(const IntegerLiteral *E) { 101 return llvm::ConstantInt::get(E->getValue()); 102 } 103 Value *VisitFloatingLiteral(const FloatingLiteral *E) { 104 return llvm::ConstantFP::get(ConvertType(E->getType()), E->getValue()); 105 } 106 Value *VisitCharacterLiteral(const CharacterLiteral *E) { 107 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); 108 } 109 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 110 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); 111 } 112 Value *VisitTypesCompatibleExpr(const TypesCompatibleExpr *E) { 113 return llvm::ConstantInt::get(ConvertType(E->getType()), 114 CGF.getContext().typesAreCompatible( 115 E->getArgType1(), E->getArgType2())); 116 } 117 Value *VisitSizeOfAlignOfTypeExpr(const SizeOfAlignOfTypeExpr *E) { 118 return EmitSizeAlignOf(E->getArgumentType(), E->getType(), E->isSizeOf()); 119 } 120 121 // l-values. 122 Value *VisitDeclRefExpr(DeclRefExpr *E) { 123 if (const EnumConstantDecl *EC = dyn_cast<EnumConstantDecl>(E->getDecl())) 124 return llvm::ConstantInt::get(EC->getInitVal()); 125 return EmitLoadOfLValue(E); 126 } 127 Value *VisitObjCMessageExpr(ObjCMessageExpr *E); 128 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { return EmitLoadOfLValue(E);} 129 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E); 130 Value *VisitMemberExpr(Expr *E) { return EmitLoadOfLValue(E); } 131 Value *VisitOCUVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); } 132 Value *VisitStringLiteral(Expr *E) { return EmitLValue(E).getAddress(); } 133 Value *VisitPreDefinedExpr(Expr *E) { return EmitLValue(E).getAddress(); } 134 135 Value *VisitInitListExpr(InitListExpr *E) { 136 unsigned NumInitElements = E->getNumInits(); 137 138 const llvm::VectorType *VType = 139 dyn_cast<llvm::VectorType>(ConvertType(E->getType())); 140 141 // We have a scalar in braces. Just use the first element. 142 if (!VType) 143 return Visit(E->getInit(0)); 144 145 unsigned NumVectorElements = VType->getNumElements(); 146 const llvm::Type *ElementType = VType->getElementType(); 147 148 // Emit individual vector element stores. 149 llvm::Value *V = llvm::UndefValue::get(VType); 150 151 // Emit initializers 152 unsigned i; 153 for (i = 0; i < NumInitElements; ++i) { 154 Value *NewV = Visit(E->getInit(i)); 155 Value *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, i); 156 V = Builder.CreateInsertElement(V, NewV, Idx); 157 } 158 159 // Emit remaining default initializers 160 for (/* Do not initialize i*/; i < NumVectorElements; ++i) { 161 Value *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, i); 162 llvm::Value *NewV = llvm::Constant::getNullValue(ElementType); 163 V = Builder.CreateInsertElement(V, NewV, Idx); 164 } 165 166 return V; 167 } 168 169 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 170 return Visit(E->getInitializer()); 171 } 172 173 Value *VisitImplicitCastExpr(const ImplicitCastExpr *E); 174 Value *VisitCastExpr(const CastExpr *E) { 175 return EmitCastExpr(E->getSubExpr(), E->getType()); 176 } 177 Value *EmitCastExpr(const Expr *E, QualType T); 178 179 Value *VisitCallExpr(const CallExpr *E) { 180 return CGF.EmitCallExpr(E).getScalarVal(); 181 } 182 183 Value *VisitStmtExpr(const StmtExpr *E); 184 185 // Unary Operators. 186 Value *VisitPrePostIncDec(const UnaryOperator *E, bool isInc, bool isPre); 187 Value *VisitUnaryPostDec(const UnaryOperator *E) { 188 return VisitPrePostIncDec(E, false, false); 189 } 190 Value *VisitUnaryPostInc(const UnaryOperator *E) { 191 return VisitPrePostIncDec(E, true, false); 192 } 193 Value *VisitUnaryPreDec(const UnaryOperator *E) { 194 return VisitPrePostIncDec(E, false, true); 195 } 196 Value *VisitUnaryPreInc(const UnaryOperator *E) { 197 return VisitPrePostIncDec(E, true, true); 198 } 199 Value *VisitUnaryAddrOf(const UnaryOperator *E) { 200 return EmitLValue(E->getSubExpr()).getAddress(); 201 } 202 Value *VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); } 203 Value *VisitUnaryPlus(const UnaryOperator *E) { 204 return Visit(E->getSubExpr()); 205 } 206 Value *VisitUnaryMinus (const UnaryOperator *E); 207 Value *VisitUnaryNot (const UnaryOperator *E); 208 Value *VisitUnaryLNot (const UnaryOperator *E); 209 Value *VisitUnarySizeOf (const UnaryOperator *E) { 210 return EmitSizeAlignOf(E->getSubExpr()->getType(), E->getType(), true); 211 } 212 Value *VisitUnaryAlignOf (const UnaryOperator *E) { 213 return EmitSizeAlignOf(E->getSubExpr()->getType(), E->getType(), false); 214 } 215 Value *EmitSizeAlignOf(QualType TypeToSize, QualType RetType, 216 bool isSizeOf); 217 Value *VisitUnaryReal (const UnaryOperator *E); 218 Value *VisitUnaryImag (const UnaryOperator *E); 219 Value *VisitUnaryExtension(const UnaryOperator *E) { 220 return Visit(E->getSubExpr()); 221 } 222 Value *VisitUnaryOffsetOf(const UnaryOperator *E); 223 224 // Binary Operators. 225 Value *EmitMul(const BinOpInfo &Ops) { 226 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul"); 227 } 228 Value *EmitDiv(const BinOpInfo &Ops); 229 Value *EmitRem(const BinOpInfo &Ops); 230 Value *EmitAdd(const BinOpInfo &Ops); 231 Value *EmitSub(const BinOpInfo &Ops); 232 Value *EmitShl(const BinOpInfo &Ops); 233 Value *EmitShr(const BinOpInfo &Ops); 234 Value *EmitAnd(const BinOpInfo &Ops) { 235 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and"); 236 } 237 Value *EmitXor(const BinOpInfo &Ops) { 238 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor"); 239 } 240 Value *EmitOr (const BinOpInfo &Ops) { 241 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or"); 242 } 243 244 BinOpInfo EmitBinOps(const BinaryOperator *E); 245 Value *EmitCompoundAssign(const CompoundAssignOperator *E, 246 Value *(ScalarExprEmitter::*F)(const BinOpInfo &)); 247 248 // Binary operators and binary compound assignment operators. 249#define HANDLEBINOP(OP) \ 250 Value *VisitBin ## OP(const BinaryOperator *E) { \ 251 return Emit ## OP(EmitBinOps(E)); \ 252 } \ 253 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \ 254 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \ 255 } 256 HANDLEBINOP(Mul); 257 HANDLEBINOP(Div); 258 HANDLEBINOP(Rem); 259 HANDLEBINOP(Add); 260 // (Sub) - Sub is handled specially below for ptr-ptr subtract. 261 HANDLEBINOP(Shl); 262 HANDLEBINOP(Shr); 263 HANDLEBINOP(And); 264 HANDLEBINOP(Xor); 265 HANDLEBINOP(Or); 266#undef HANDLEBINOP 267 Value *VisitBinSub(const BinaryOperator *E); 268 Value *VisitBinSubAssign(const CompoundAssignOperator *E) { 269 return EmitCompoundAssign(E, &ScalarExprEmitter::EmitSub); 270 } 271 272 // Comparisons. 273 Value *EmitCompare(const BinaryOperator *E, unsigned UICmpOpc, 274 unsigned SICmpOpc, unsigned FCmpOpc); 275#define VISITCOMP(CODE, UI, SI, FP) \ 276 Value *VisitBin##CODE(const BinaryOperator *E) { \ 277 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \ 278 llvm::FCmpInst::FP); } 279 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT); 280 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT); 281 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE); 282 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE); 283 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ); 284 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE); 285#undef VISITCOMP 286 287 Value *VisitBinAssign (const BinaryOperator *E); 288 289 Value *VisitBinLAnd (const BinaryOperator *E); 290 Value *VisitBinLOr (const BinaryOperator *E); 291 Value *VisitBinComma (const BinaryOperator *E); 292 293 // Other Operators. 294 Value *VisitConditionalOperator(const ConditionalOperator *CO); 295 Value *VisitChooseExpr(ChooseExpr *CE); 296 Value *VisitOverloadExpr(OverloadExpr *OE); 297 Value *VisitVAArgExpr(VAArgExpr *VE); 298 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) { 299 return CGF.EmitObjCStringLiteral(E); 300 } 301 Value *VisitObjCEncodeExpr(const ObjCEncodeExpr *E); 302}; 303} // end anonymous namespace. 304 305//===----------------------------------------------------------------------===// 306// Utilities 307//===----------------------------------------------------------------------===// 308 309/// EmitConversionToBool - Convert the specified expression value to a 310/// boolean (i1) truth value. This is equivalent to "Val != 0". 311Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) { 312 assert(SrcType->isCanonical() && "EmitScalarConversion strips typedefs"); 313 314 if (SrcType->isRealFloatingType()) { 315 // Compare against 0.0 for fp scalars. 316 llvm::Value *Zero = llvm::Constant::getNullValue(Src->getType()); 317 return Builder.CreateFCmpUNE(Src, Zero, "tobool"); 318 } 319 320 assert((SrcType->isIntegerType() || SrcType->isPointerType()) && 321 "Unknown scalar type to convert"); 322 323 // Because of the type rules of C, we often end up computing a logical value, 324 // then zero extending it to int, then wanting it as a logical value again. 325 // Optimize this common case. 326 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(Src)) { 327 if (ZI->getOperand(0)->getType() == llvm::Type::Int1Ty) { 328 Value *Result = ZI->getOperand(0); 329 // If there aren't any more uses, zap the instruction to save space. 330 // Note that there can be more uses, for example if this 331 // is the result of an assignment. 332 if (ZI->use_empty()) 333 ZI->eraseFromParent(); 334 return Result; 335 } 336 } 337 338 // Compare against an integer or pointer null. 339 llvm::Value *Zero = llvm::Constant::getNullValue(Src->getType()); 340 return Builder.CreateICmpNE(Src, Zero, "tobool"); 341} 342 343/// EmitScalarConversion - Emit a conversion from the specified type to the 344/// specified destination type, both of which are LLVM scalar types. 345Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType, 346 QualType DstType) { 347 SrcType = SrcType.getCanonicalType(); 348 DstType = DstType.getCanonicalType(); 349 if (SrcType == DstType) return Src; 350 351 if (DstType->isVoidType()) return 0; 352 353 // Handle conversions to bool first, they are special: comparisons against 0. 354 if (DstType->isBooleanType()) 355 return EmitConversionToBool(Src, SrcType); 356 357 const llvm::Type *DstTy = ConvertType(DstType); 358 359 // Ignore conversions like int -> uint. 360 if (Src->getType() == DstTy) 361 return Src; 362 363 // Handle pointer conversions next: pointers can only be converted to/from 364 // other pointers and integers. 365 if (isa<PointerType>(DstType)) { 366 // The source value may be an integer, or a pointer. 367 if (isa<llvm::PointerType>(Src->getType())) 368 return Builder.CreateBitCast(Src, DstTy, "conv"); 369 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?"); 370 return Builder.CreateIntToPtr(Src, DstTy, "conv"); 371 } 372 373 if (isa<PointerType>(SrcType)) { 374 // Must be an ptr to int cast. 375 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?"); 376 return Builder.CreatePtrToInt(Src, DstTy, "conv"); 377 } 378 379 // A scalar source can be splatted to an OCU vector of the same element type 380 if (DstType->isOCUVectorType() && !isa<VectorType>(SrcType) && 381 cast<llvm::VectorType>(DstTy)->getElementType() == Src->getType()) 382 return CGF.EmitVector(&Src, DstType->getAsVectorType()->getNumElements(), 383 true); 384 385 // Allow bitcast from vector to integer/fp of the same size. 386 if (isa<llvm::VectorType>(Src->getType()) || 387 isa<llvm::VectorType>(DstTy)) 388 return Builder.CreateBitCast(Src, DstTy, "conv"); 389 390 // Finally, we have the arithmetic types: real int/float. 391 if (isa<llvm::IntegerType>(Src->getType())) { 392 bool InputSigned = SrcType->isSignedIntegerType(); 393 if (isa<llvm::IntegerType>(DstTy)) 394 return Builder.CreateIntCast(Src, DstTy, InputSigned, "conv"); 395 else if (InputSigned) 396 return Builder.CreateSIToFP(Src, DstTy, "conv"); 397 else 398 return Builder.CreateUIToFP(Src, DstTy, "conv"); 399 } 400 401 assert(Src->getType()->isFloatingPoint() && "Unknown real conversion"); 402 if (isa<llvm::IntegerType>(DstTy)) { 403 if (DstType->isSignedIntegerType()) 404 return Builder.CreateFPToSI(Src, DstTy, "conv"); 405 else 406 return Builder.CreateFPToUI(Src, DstTy, "conv"); 407 } 408 409 assert(DstTy->isFloatingPoint() && "Unknown real conversion"); 410 if (DstTy->getTypeID() < Src->getType()->getTypeID()) 411 return Builder.CreateFPTrunc(Src, DstTy, "conv"); 412 else 413 return Builder.CreateFPExt(Src, DstTy, "conv"); 414} 415 416/// EmitComplexToScalarConversion - Emit a conversion from the specified 417/// complex type to the specified destination type, where the destination 418/// type is an LLVM scalar type. 419Value *ScalarExprEmitter:: 420EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src, 421 QualType SrcTy, QualType DstTy) { 422 // Get the source element type. 423 SrcTy = cast<ComplexType>(SrcTy.getCanonicalType())->getElementType(); 424 425 // Handle conversions to bool first, they are special: comparisons against 0. 426 if (DstTy->isBooleanType()) { 427 // Complex != 0 -> (Real != 0) | (Imag != 0) 428 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy); 429 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy); 430 return Builder.CreateOr(Src.first, Src.second, "tobool"); 431 } 432 433 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type, 434 // the imaginary part of the complex value is discarded and the value of the 435 // real part is converted according to the conversion rules for the 436 // corresponding real type. 437 return EmitScalarConversion(Src.first, SrcTy, DstTy); 438} 439 440 441//===----------------------------------------------------------------------===// 442// Visitor Methods 443//===----------------------------------------------------------------------===// 444 445Value *ScalarExprEmitter::VisitExpr(Expr *E) { 446 CGF.WarnUnsupported(E, "scalar expression"); 447 if (E->getType()->isVoidType()) 448 return 0; 449 return llvm::UndefValue::get(CGF.ConvertType(E->getType())); 450} 451 452Value *ScalarExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 453 // Only the lookup mechanism and first two arguments of the method 454 // implementation vary between runtimes. We can get the receiver and 455 // arguments in generic code. 456 457 // Find the receiver 458 llvm::Value *Receiver = CGF.EmitScalarExpr(E->getReceiver()); 459 460 // Process the arguments 461 unsigned ArgC = E->getNumArgs(); 462 llvm::SmallVector<llvm::Value*, 16> Args; 463 for (unsigned i = 0; i != ArgC; ++i) { 464 Expr *ArgExpr = E->getArg(i); 465 QualType ArgTy = ArgExpr->getType(); 466 if (!CGF.hasAggregateLLVMType(ArgTy)) { 467 // Scalar argument is passed by-value. 468 Args.push_back(CGF.EmitScalarExpr(ArgExpr)); 469 } else if (ArgTy->isAnyComplexType()) { 470 // Make a temporary alloca to pass the argument. 471 llvm::Value *DestMem = CGF.CreateTempAlloca(ConvertType(ArgTy)); 472 CGF.EmitComplexExprIntoAddr(ArgExpr, DestMem, false); 473 Args.push_back(DestMem); 474 } else { 475 llvm::Value *DestMem = CGF.CreateTempAlloca(ConvertType(ArgTy)); 476 CGF.EmitAggExpr(ArgExpr, DestMem, false); 477 Args.push_back(DestMem); 478 } 479 } 480 481 // Get the selector string 482 std::string SelStr = E->getSelector().getName(); 483 llvm::Constant *Selector = CGF.CGM.GetAddrOfConstantString(SelStr); 484 485 llvm::Value *SelPtr = Builder.CreateStructGEP(Selector, 0); 486 return Runtime->generateMessageSend(Builder, ConvertType(E->getType()), 487 CGF.LoadObjCSelf(), 488 Receiver, SelPtr, 489 &Args[0], Args.size()); 490} 491 492Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 493 // Emit subscript expressions in rvalue context's. For most cases, this just 494 // loads the lvalue formed by the subscript expr. However, we have to be 495 // careful, because the base of a vector subscript is occasionally an rvalue, 496 // so we can't get it as an lvalue. 497 if (!E->getBase()->getType()->isVectorType()) 498 return EmitLoadOfLValue(E); 499 500 // Handle the vector case. The base must be a vector, the index must be an 501 // integer value. 502 Value *Base = Visit(E->getBase()); 503 Value *Idx = Visit(E->getIdx()); 504 505 // FIXME: Convert Idx to i32 type. 506 return Builder.CreateExtractElement(Base, Idx, "vecext"); 507} 508 509/// VisitImplicitCastExpr - Implicit casts are the same as normal casts, but 510/// also handle things like function to pointer-to-function decay, and array to 511/// pointer decay. 512Value *ScalarExprEmitter::VisitImplicitCastExpr(const ImplicitCastExpr *E) { 513 const Expr *Op = E->getSubExpr(); 514 515 // If this is due to array->pointer conversion, emit the array expression as 516 // an l-value. 517 if (Op->getType()->isArrayType()) { 518 // FIXME: For now we assume that all source arrays map to LLVM arrays. This 519 // will not true when we add support for VLAs. 520 Value *V = EmitLValue(Op).getAddress(); // Bitfields can't be arrays. 521 522 assert(isa<llvm::PointerType>(V->getType()) && 523 isa<llvm::ArrayType>(cast<llvm::PointerType>(V->getType()) 524 ->getElementType()) && 525 "Doesn't support VLAs yet!"); 526 V = Builder.CreateStructGEP(V, 0, "arraydecay"); 527 528 // The resultant pointer type can be implicitly casted to other pointer 529 // types as well, for example void*. 530 const llvm::Type *DestPTy = ConvertType(E->getType()); 531 assert(isa<llvm::PointerType>(DestPTy) && 532 "Only expect implicit cast to pointer"); 533 if (V->getType() != DestPTy) 534 V = Builder.CreateBitCast(V, DestPTy, "ptrconv"); 535 return V; 536 537 } else if (E->getType()->isReferenceType()) { 538 assert(cast<ReferenceType>(E->getType().getCanonicalType())-> 539 getPointeeType() == 540 Op->getType().getCanonicalType() && "Incompatible types!"); 541 542 return EmitLValue(Op).getAddress(); 543 } 544 545 return EmitCastExpr(Op, E->getType()); 546} 547 548 549// VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts 550// have to handle a more broad range of conversions than explicit casts, as they 551// handle things like function to ptr-to-function decay etc. 552Value *ScalarExprEmitter::EmitCastExpr(const Expr *E, QualType DestTy) { 553 // Handle cases where the source is an non-complex type. 554 555 if (!CGF.hasAggregateLLVMType(E->getType())) { 556 Value *Src = Visit(const_cast<Expr*>(E)); 557 558 // Use EmitScalarConversion to perform the conversion. 559 return EmitScalarConversion(Src, E->getType(), DestTy); 560 } 561 562 if (E->getType()->isAnyComplexType()) { 563 // Handle cases where the source is a complex type. 564 return EmitComplexToScalarConversion(CGF.EmitComplexExpr(E), E->getType(), 565 DestTy); 566 } 567 568 // Okay, this is a cast from an aggregate. It must be a cast to void. Just 569 // evaluate the result and return. 570 CGF.EmitAggExpr(E, 0, false); 571 return 0; 572} 573 574Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) { 575 return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getScalarVal(); 576} 577 578 579//===----------------------------------------------------------------------===// 580// Unary Operators 581//===----------------------------------------------------------------------===// 582 583Value *ScalarExprEmitter::VisitPrePostIncDec(const UnaryOperator *E, 584 bool isInc, bool isPre) { 585 LValue LV = EmitLValue(E->getSubExpr()); 586 // FIXME: Handle volatile! 587 Value *InVal = CGF.EmitLoadOfLValue(LV, // false 588 E->getSubExpr()->getType()).getScalarVal(); 589 590 int AmountVal = isInc ? 1 : -1; 591 592 Value *NextVal; 593 if (isa<llvm::PointerType>(InVal->getType())) { 594 // FIXME: This isn't right for VLAs. 595 NextVal = llvm::ConstantInt::get(llvm::Type::Int32Ty, AmountVal); 596 NextVal = Builder.CreateGEP(InVal, NextVal, "ptrincdec"); 597 } else { 598 // Add the inc/dec to the real part. 599 if (isa<llvm::IntegerType>(InVal->getType())) 600 NextVal = llvm::ConstantInt::get(InVal->getType(), AmountVal); 601 else if (InVal->getType() == llvm::Type::FloatTy) 602 // FIXME: Handle long double. 603 NextVal = 604 llvm::ConstantFP::get(InVal->getType(), 605 llvm::APFloat(static_cast<float>(AmountVal))); 606 else { 607 // FIXME: Handle long double. 608 assert(InVal->getType() == llvm::Type::DoubleTy); 609 NextVal = 610 llvm::ConstantFP::get(InVal->getType(), 611 llvm::APFloat(static_cast<double>(AmountVal))); 612 } 613 NextVal = Builder.CreateAdd(InVal, NextVal, isInc ? "inc" : "dec"); 614 } 615 616 // Store the updated result through the lvalue. 617 CGF.EmitStoreThroughLValue(RValue::get(NextVal), LV, 618 E->getSubExpr()->getType()); 619 620 // If this is a postinc, return the value read from memory, otherwise use the 621 // updated value. 622 return isPre ? NextVal : InVal; 623} 624 625 626Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) { 627 Value *Op = Visit(E->getSubExpr()); 628 return Builder.CreateNeg(Op, "neg"); 629} 630 631Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) { 632 Value *Op = Visit(E->getSubExpr()); 633 return Builder.CreateNot(Op, "neg"); 634} 635 636Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) { 637 // Compare operand to zero. 638 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr()); 639 640 // Invert value. 641 // TODO: Could dynamically modify easy computations here. For example, if 642 // the operand is an icmp ne, turn into icmp eq. 643 BoolVal = Builder.CreateNot(BoolVal, "lnot"); 644 645 // ZExt result to int. 646 return Builder.CreateZExt(BoolVal, CGF.LLVMIntTy, "lnot.ext"); 647} 648 649/// EmitSizeAlignOf - Return the size or alignment of the 'TypeToSize' type as 650/// an integer (RetType). 651Value *ScalarExprEmitter::EmitSizeAlignOf(QualType TypeToSize, 652 QualType RetType,bool isSizeOf){ 653 assert(RetType->isIntegerType() && "Result type must be an integer!"); 654 uint32_t ResultWidth = 655 static_cast<uint32_t>(CGF.getContext().getTypeSize(RetType)); 656 657 // sizeof(void) and __alignof__(void) = 1 as a gcc extension. 658 if (TypeToSize->isVoidType()) 659 return llvm::ConstantInt::get(llvm::APInt(ResultWidth, 1)); 660 661 /// FIXME: This doesn't handle VLAs yet! 662 std::pair<uint64_t, unsigned> Info = CGF.getContext().getTypeInfo(TypeToSize); 663 664 uint64_t Val = isSizeOf ? Info.first : Info.second; 665 Val /= 8; // Return size in bytes, not bits. 666 667 return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val)); 668} 669 670Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) { 671 Expr *Op = E->getSubExpr(); 672 if (Op->getType()->isAnyComplexType()) 673 return CGF.EmitComplexExpr(Op).first; 674 return Visit(Op); 675} 676Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) { 677 Expr *Op = E->getSubExpr(); 678 if (Op->getType()->isAnyComplexType()) 679 return CGF.EmitComplexExpr(Op).second; 680 681 // __imag on a scalar returns zero. Emit it the subexpr to ensure side 682 // effects are evaluated. 683 CGF.EmitScalarExpr(Op); 684 return llvm::Constant::getNullValue(ConvertType(E->getType())); 685} 686 687Value *ScalarExprEmitter::VisitUnaryOffsetOf(const UnaryOperator *E) 688{ 689 int64_t Val = E->evaluateOffsetOf(CGF.getContext()); 690 691 assert(E->getType()->isIntegerType() && "Result type must be an integer!"); 692 693 uint32_t ResultWidth = 694 static_cast<uint32_t>(CGF.getContext().getTypeSize(E->getType())); 695 return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val)); 696} 697 698//===----------------------------------------------------------------------===// 699// Binary Operators 700//===----------------------------------------------------------------------===// 701 702BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) { 703 BinOpInfo Result; 704 Result.LHS = Visit(E->getLHS()); 705 Result.RHS = Visit(E->getRHS()); 706 Result.Ty = E->getType(); 707 Result.E = E; 708 return Result; 709} 710 711Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E, 712 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) { 713 QualType LHSTy = E->getLHS()->getType(), RHSTy = E->getRHS()->getType(); 714 715 BinOpInfo OpInfo; 716 717 // Load the LHS and RHS operands. 718 LValue LHSLV = EmitLValue(E->getLHS()); 719 OpInfo.LHS = EmitLoadOfLValue(LHSLV, LHSTy); 720 721 // Determine the computation type. If the RHS is complex, then this is one of 722 // the add/sub/mul/div operators. All of these operators can be computed in 723 // with just their real component even though the computation domain really is 724 // complex. 725 QualType ComputeType = E->getComputationType(); 726 727 // If the computation type is complex, then the RHS is complex. Emit the RHS. 728 if (const ComplexType *CT = ComputeType->getAsComplexType()) { 729 ComputeType = CT->getElementType(); 730 731 // Emit the RHS, only keeping the real component. 732 OpInfo.RHS = CGF.EmitComplexExpr(E->getRHS()).first; 733 RHSTy = RHSTy->getAsComplexType()->getElementType(); 734 } else { 735 // Otherwise the RHS is a simple scalar value. 736 OpInfo.RHS = Visit(E->getRHS()); 737 } 738 739 // Convert the LHS/RHS values to the computation type. 740 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy, ComputeType); 741 742 // Do not merge types for -= or += where the LHS is a pointer. 743 if (!(E->getOpcode() == BinaryOperator::SubAssign || 744 E->getOpcode() == BinaryOperator::AddAssign) || 745 !E->getLHS()->getType()->isPointerType()) { 746 OpInfo.RHS = EmitScalarConversion(OpInfo.RHS, RHSTy, ComputeType); 747 } 748 OpInfo.Ty = ComputeType; 749 OpInfo.E = E; 750 751 // Expand the binary operator. 752 Value *Result = (this->*Func)(OpInfo); 753 754 // Truncate the result back to the LHS type. 755 Result = EmitScalarConversion(Result, ComputeType, LHSTy); 756 757 // Store the result value into the LHS lvalue. 758 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV, E->getType()); 759 760 return Result; 761} 762 763 764Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) { 765 if (Ops.LHS->getType()->isFPOrFPVector()) 766 return Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div"); 767 else if (Ops.Ty->isUnsignedIntegerType()) 768 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div"); 769 else 770 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div"); 771} 772 773Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) { 774 // Rem in C can't be a floating point type: C99 6.5.5p2. 775 if (Ops.Ty->isUnsignedIntegerType()) 776 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem"); 777 else 778 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem"); 779} 780 781 782Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &Ops) { 783 if (!Ops.Ty->isPointerType()) 784 return Builder.CreateAdd(Ops.LHS, Ops.RHS, "add"); 785 786 // FIXME: What about a pointer to a VLA? 787 Value *Ptr, *Idx; 788 Expr *IdxExp; 789 if (isa<llvm::PointerType>(Ops.LHS->getType())) { // pointer + int 790 Ptr = Ops.LHS; 791 Idx = Ops.RHS; 792 IdxExp = Ops.E->getRHS(); 793 } else { // int + pointer 794 Ptr = Ops.RHS; 795 Idx = Ops.LHS; 796 IdxExp = Ops.E->getLHS(); 797 } 798 799 unsigned Width = cast<llvm::IntegerType>(Idx->getType())->getBitWidth(); 800 if (Width < CGF.LLVMPointerWidth) { 801 // Zero or sign extend the pointer value based on whether the index is 802 // signed or not. 803 const llvm::Type *IdxType = llvm::IntegerType::get(CGF.LLVMPointerWidth); 804 if (IdxExp->getType().getCanonicalType()->isSignedIntegerType()) 805 Idx = Builder.CreateSExt(Idx, IdxType, "idx.ext"); 806 else 807 Idx = Builder.CreateZExt(Idx, IdxType, "idx.ext"); 808 } 809 810 return Builder.CreateGEP(Ptr, Idx, "add.ptr"); 811} 812 813Value *ScalarExprEmitter::EmitSub(const BinOpInfo &Ops) { 814 if (!isa<llvm::PointerType>(Ops.LHS->getType())) 815 return Builder.CreateSub(Ops.LHS, Ops.RHS, "sub"); 816 817 // pointer - int 818 assert(!isa<llvm::PointerType>(Ops.RHS->getType()) && 819 "ptr-ptr shouldn't get here"); 820 // FIXME: The pointer could point to a VLA. 821 Value *Idx = Builder.CreateNeg(Ops.RHS, "sub.ptr.neg"); 822 823 unsigned Width = cast<llvm::IntegerType>(Idx->getType())->getBitWidth(); 824 if (Width < CGF.LLVMPointerWidth) { 825 // Zero or sign extend the pointer value based on whether the index is 826 // signed or not. 827 const llvm::Type *IdxType = llvm::IntegerType::get(CGF.LLVMPointerWidth); 828 if (Ops.E->getRHS()->getType().getCanonicalType()->isSignedIntegerType()) 829 Idx = Builder.CreateSExt(Idx, IdxType, "idx.ext"); 830 else 831 Idx = Builder.CreateZExt(Idx, IdxType, "idx.ext"); 832 } 833 834 return Builder.CreateGEP(Ops.LHS, Idx, "sub.ptr"); 835} 836 837Value *ScalarExprEmitter::VisitBinSub(const BinaryOperator *E) { 838 // "X - Y" is different from "X -= Y" in one case: when Y is a pointer. In 839 // the compound assignment case it is invalid, so just handle it here. 840 if (!E->getRHS()->getType()->isPointerType()) 841 return EmitSub(EmitBinOps(E)); 842 843 // pointer - pointer 844 Value *LHS = Visit(E->getLHS()); 845 Value *RHS = Visit(E->getRHS()); 846 847 const QualType LHSType = E->getLHS()->getType().getCanonicalType(); 848 const QualType LHSElementType = cast<PointerType>(LHSType)->getPointeeType(); 849 uint64_t ElementSize = CGF.getContext().getTypeSize(LHSElementType) / 8; 850 851 const llvm::Type *ResultType = ConvertType(E->getType()); 852 LHS = Builder.CreatePtrToInt(LHS, ResultType, "sub.ptr.lhs.cast"); 853 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast"); 854 Value *BytesBetween = Builder.CreateSub(LHS, RHS, "sub.ptr.sub"); 855 856 // HACK: LLVM doesn't have an divide instruction that 'knows' there is no 857 // remainder. As such, we handle common power-of-two cases here to generate 858 // better code. 859 if (llvm::isPowerOf2_64(ElementSize)) { 860 Value *ShAmt = 861 llvm::ConstantInt::get(ResultType, llvm::Log2_64(ElementSize)); 862 return Builder.CreateAShr(BytesBetween, ShAmt, "sub.ptr.shr"); 863 } 864 865 // Otherwise, do a full sdiv. 866 Value *BytesPerElt = llvm::ConstantInt::get(ResultType, ElementSize); 867 return Builder.CreateSDiv(BytesBetween, BytesPerElt, "sub.ptr.div"); 868} 869 870 871Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) { 872 // LLVM requires the LHS and RHS to be the same type: promote or truncate the 873 // RHS to the same size as the LHS. 874 Value *RHS = Ops.RHS; 875 if (Ops.LHS->getType() != RHS->getType()) 876 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); 877 878 return Builder.CreateShl(Ops.LHS, RHS, "shl"); 879} 880 881Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) { 882 // LLVM requires the LHS and RHS to be the same type: promote or truncate the 883 // RHS to the same size as the LHS. 884 Value *RHS = Ops.RHS; 885 if (Ops.LHS->getType() != RHS->getType()) 886 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); 887 888 if (Ops.Ty->isUnsignedIntegerType()) 889 return Builder.CreateLShr(Ops.LHS, RHS, "shr"); 890 return Builder.CreateAShr(Ops.LHS, RHS, "shr"); 891} 892 893Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc, 894 unsigned SICmpOpc, unsigned FCmpOpc) { 895 Value *Result; 896 QualType LHSTy = E->getLHS()->getType(); 897 if (!LHSTy->isAnyComplexType()) { 898 Value *LHS = Visit(E->getLHS()); 899 Value *RHS = Visit(E->getRHS()); 900 901 if (LHS->getType()->isFloatingPoint()) { 902 Result = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc, 903 LHS, RHS, "cmp"); 904 } else if (LHSTy->isUnsignedIntegerType()) { 905 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 906 LHS, RHS, "cmp"); 907 } else { 908 // Signed integers and pointers. 909 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc, 910 LHS, RHS, "cmp"); 911 } 912 } else { 913 // Complex Comparison: can only be an equality comparison. 914 CodeGenFunction::ComplexPairTy LHS = CGF.EmitComplexExpr(E->getLHS()); 915 CodeGenFunction::ComplexPairTy RHS = CGF.EmitComplexExpr(E->getRHS()); 916 917 QualType CETy = 918 cast<ComplexType>(LHSTy.getCanonicalType())->getElementType(); 919 920 Value *ResultR, *ResultI; 921 if (CETy->isRealFloatingType()) { 922 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc, 923 LHS.first, RHS.first, "cmp.r"); 924 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc, 925 LHS.second, RHS.second, "cmp.i"); 926 } else { 927 // Complex comparisons can only be equality comparisons. As such, signed 928 // and unsigned opcodes are the same. 929 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 930 LHS.first, RHS.first, "cmp.r"); 931 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc, 932 LHS.second, RHS.second, "cmp.i"); 933 } 934 935 if (E->getOpcode() == BinaryOperator::EQ) { 936 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri"); 937 } else { 938 assert(E->getOpcode() == BinaryOperator::NE && 939 "Complex comparison other than == or != ?"); 940 Result = Builder.CreateOr(ResultR, ResultI, "or.ri"); 941 } 942 } 943 944 // ZExt result to int. 945 return Builder.CreateZExt(Result, CGF.LLVMIntTy, "cmp.ext"); 946} 947 948Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) { 949 LValue LHS = EmitLValue(E->getLHS()); 950 Value *RHS = Visit(E->getRHS()); 951 952 // Store the value into the LHS. 953 // FIXME: Volatility! 954 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS, E->getType()); 955 956 // Return the RHS. 957 return RHS; 958} 959 960Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) { 961 Value *LHSCond = CGF.EvaluateExprAsBool(E->getLHS()); 962 963 llvm::BasicBlock *ContBlock = llvm::BasicBlock::Create("land_cont"); 964 llvm::BasicBlock *RHSBlock = llvm::BasicBlock::Create("land_rhs"); 965 966 llvm::BasicBlock *OrigBlock = Builder.GetInsertBlock(); 967 Builder.CreateCondBr(LHSCond, RHSBlock, ContBlock); 968 969 CGF.EmitBlock(RHSBlock); 970 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); 971 972 // Reaquire the RHS block, as there may be subblocks inserted. 973 RHSBlock = Builder.GetInsertBlock(); 974 CGF.EmitBlock(ContBlock); 975 976 // Create a PHI node. If we just evaluted the LHS condition, the result is 977 // false. If we evaluated both, the result is the RHS condition. 978 llvm::PHINode *PN = Builder.CreatePHI(llvm::Type::Int1Ty, "land"); 979 PN->reserveOperandSpace(2); 980 PN->addIncoming(llvm::ConstantInt::getFalse(), OrigBlock); 981 PN->addIncoming(RHSCond, RHSBlock); 982 983 // ZExt result to int. 984 return Builder.CreateZExt(PN, CGF.LLVMIntTy, "land.ext"); 985} 986 987Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) { 988 Value *LHSCond = CGF.EvaluateExprAsBool(E->getLHS()); 989 990 llvm::BasicBlock *ContBlock = llvm::BasicBlock::Create("lor_cont"); 991 llvm::BasicBlock *RHSBlock = llvm::BasicBlock::Create("lor_rhs"); 992 993 llvm::BasicBlock *OrigBlock = Builder.GetInsertBlock(); 994 Builder.CreateCondBr(LHSCond, ContBlock, RHSBlock); 995 996 CGF.EmitBlock(RHSBlock); 997 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); 998 999 // Reaquire the RHS block, as there may be subblocks inserted. 1000 RHSBlock = Builder.GetInsertBlock(); 1001 CGF.EmitBlock(ContBlock); 1002 1003 // Create a PHI node. If we just evaluted the LHS condition, the result is 1004 // true. If we evaluated both, the result is the RHS condition. 1005 llvm::PHINode *PN = Builder.CreatePHI(llvm::Type::Int1Ty, "lor"); 1006 PN->reserveOperandSpace(2); 1007 PN->addIncoming(llvm::ConstantInt::getTrue(), OrigBlock); 1008 PN->addIncoming(RHSCond, RHSBlock); 1009 1010 // ZExt result to int. 1011 return Builder.CreateZExt(PN, CGF.LLVMIntTy, "lor.ext"); 1012} 1013 1014Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) { 1015 CGF.EmitStmt(E->getLHS()); 1016 return Visit(E->getRHS()); 1017} 1018 1019//===----------------------------------------------------------------------===// 1020// Other Operators 1021//===----------------------------------------------------------------------===// 1022 1023Value *ScalarExprEmitter:: 1024VisitConditionalOperator(const ConditionalOperator *E) { 1025 llvm::BasicBlock *LHSBlock = llvm::BasicBlock::Create("cond.?"); 1026 llvm::BasicBlock *RHSBlock = llvm::BasicBlock::Create("cond.:"); 1027 llvm::BasicBlock *ContBlock = llvm::BasicBlock::Create("cond.cont"); 1028 1029 // Evaluate the conditional, then convert it to bool. We do this explicitly 1030 // because we need the unconverted value if this is a GNU ?: expression with 1031 // missing middle value. 1032 Value *CondVal = CGF.EmitScalarExpr(E->getCond()); 1033 Value *CondBoolVal =CGF.EmitScalarConversion(CondVal, E->getCond()->getType(), 1034 CGF.getContext().BoolTy); 1035 Builder.CreateCondBr(CondBoolVal, LHSBlock, RHSBlock); 1036 1037 CGF.EmitBlock(LHSBlock); 1038 1039 // Handle the GNU extension for missing LHS. 1040 Value *LHS; 1041 if (E->getLHS()) 1042 LHS = Visit(E->getLHS()); 1043 else // Perform promotions, to handle cases like "short ?: int" 1044 LHS = EmitScalarConversion(CondVal, E->getCond()->getType(), E->getType()); 1045 1046 Builder.CreateBr(ContBlock); 1047 LHSBlock = Builder.GetInsertBlock(); 1048 1049 CGF.EmitBlock(RHSBlock); 1050 1051 Value *RHS = Visit(E->getRHS()); 1052 Builder.CreateBr(ContBlock); 1053 RHSBlock = Builder.GetInsertBlock(); 1054 1055 CGF.EmitBlock(ContBlock); 1056 1057 if (!LHS) { 1058 assert(E->getType()->isVoidType() && "Non-void value should have a value"); 1059 return 0; 1060 } 1061 1062 // Create a PHI node for the real part. 1063 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), "cond"); 1064 PN->reserveOperandSpace(2); 1065 PN->addIncoming(LHS, LHSBlock); 1066 PN->addIncoming(RHS, RHSBlock); 1067 return PN; 1068} 1069 1070Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) { 1071 // Emit the LHS or RHS as appropriate. 1072 return 1073 Visit(E->isConditionTrue(CGF.getContext()) ? E->getLHS() : E->getRHS()); 1074} 1075 1076Value *ScalarExprEmitter::VisitOverloadExpr(OverloadExpr *E) { 1077 return CGF.EmitCallExpr(E->getFn(), E->arg_begin(), 1078 E->getNumArgs(CGF.getContext())).getScalarVal(); 1079} 1080 1081Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 1082 llvm::Value *ArgValue = EmitLValue(VE->getSubExpr()).getAddress(); 1083 1084 llvm::Value *V = Builder.CreateVAArg(ArgValue, ConvertType(VE->getType())); 1085 return V; 1086} 1087 1088Value *ScalarExprEmitter::VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { 1089 std::string str; 1090 llvm::SmallVector<const RecordType *, 8> EncodingRecordTypes; 1091 CGF.getContext().getObjCEncodingForType(E->getEncodedType(), str, 1092 EncodingRecordTypes); 1093 1094 llvm::Constant *C = llvm::ConstantArray::get(str); 1095 C = new llvm::GlobalVariable(C->getType(), true, 1096 llvm::GlobalValue::InternalLinkage, 1097 C, ".str", &CGF.CGM.getModule()); 1098 llvm::Constant *Zero = llvm::Constant::getNullValue(llvm::Type::Int32Ty); 1099 llvm::Constant *Zeros[] = { Zero, Zero }; 1100 C = llvm::ConstantExpr::getGetElementPtr(C, Zeros, 2); 1101 1102 return C; 1103} 1104 1105//===----------------------------------------------------------------------===// 1106// Entry Point into this File 1107//===----------------------------------------------------------------------===// 1108 1109/// EmitComplexExpr - Emit the computation of the specified expression of 1110/// complex type, ignoring the result. 1111Value *CodeGenFunction::EmitScalarExpr(const Expr *E) { 1112 assert(E && !hasAggregateLLVMType(E->getType()) && 1113 "Invalid scalar expression to emit"); 1114 1115 return ScalarExprEmitter(*this).Visit(const_cast<Expr*>(E)); 1116} 1117 1118/// EmitScalarConversion - Emit a conversion from the specified type to the 1119/// specified destination type, both of which are LLVM scalar types. 1120Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy, 1121 QualType DstTy) { 1122 assert(!hasAggregateLLVMType(SrcTy) && !hasAggregateLLVMType(DstTy) && 1123 "Invalid scalar expression to emit"); 1124 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy); 1125} 1126 1127/// EmitComplexToScalarConversion - Emit a conversion from the specified 1128/// complex type to the specified destination type, where the destination 1129/// type is an LLVM scalar type. 1130Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src, 1131 QualType SrcTy, 1132 QualType DstTy) { 1133 assert(SrcTy->isAnyComplexType() && !hasAggregateLLVMType(DstTy) && 1134 "Invalid complex -> scalar conversion"); 1135 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy, 1136 DstTy); 1137} 1138 1139Value *CodeGenFunction::EmitShuffleVector(Value* V1, Value *V2, ...) { 1140 assert(V1->getType() == V2->getType() && 1141 "Vector operands must be of the same type"); 1142 1143 unsigned NumElements = 1144 cast<llvm::VectorType>(V1->getType())->getNumElements(); 1145 1146 va_list va; 1147 va_start(va, V2); 1148 1149 llvm::SmallVector<llvm::Constant*, 16> Args; 1150 1151 for (unsigned i = 0; i < NumElements; i++) { 1152 int n = va_arg(va, int); 1153 1154 assert(n >= 0 && n < (int)NumElements * 2 && 1155 "Vector shuffle index out of bounds!"); 1156 1157 Args.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, n)); 1158 } 1159 1160 const char *Name = va_arg(va, const char *); 1161 va_end(va); 1162 1163 llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], NumElements); 1164 1165 return Builder.CreateShuffleVector(V1, V2, Mask, Name); 1166} 1167 1168llvm::Value *CodeGenFunction::EmitVector(llvm::Value * const *Vals, 1169 unsigned NumVals, bool isSplat) 1170{ 1171 llvm::Value *Vec 1172 = llvm::UndefValue::get(llvm::VectorType::get(Vals[0]->getType(), NumVals)); 1173 1174 for (unsigned i = 0, e = NumVals ; i != e; ++i) { 1175 llvm::Value *Val = isSplat ? Vals[0] : Vals[i]; 1176 llvm::Value *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, i); 1177 Vec = Builder.CreateInsertElement(Vec, Val, Idx, "tmp"); 1178 } 1179 1180 return Vec; 1181} 1182