1 //===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This contains code to emit Expr nodes with scalar LLVM types as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
16 #include "CGDebugInfo.h"
17 #include "CGObjCRuntime.h"
18 #include "CodeGenModule.h"
19 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/RecordLayout.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "clang/Basic/TargetInfo.h"
24 #include "clang/Frontend/CodeGenOptions.h"
25 #include "llvm/IR/CFG.h"
26 #include "llvm/IR/Constants.h"
27 #include "llvm/IR/DataLayout.h"
28 #include "llvm/IR/Function.h"
29 #include "llvm/IR/GlobalVariable.h"
30 #include "llvm/IR/Intrinsics.h"
31 #include "llvm/IR/Module.h"
34 using namespace clang;
35 using namespace CodeGen;
38 //===----------------------------------------------------------------------===//
39 // Scalar Expression Emitter
40 //===----------------------------------------------------------------------===//
46 QualType Ty; // Computation Type.
47 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
49 const Expr *E; // Entire expr, for error unsupported. May not be binop.
52 static bool MustVisitNullValue(const Expr *E) {
53 // If a null pointer expression's type is the C++0x nullptr_t, then
54 // it's not necessarily a simple constant and it must be evaluated
55 // for its potential side effects.
56 return E->getType()->isNullPtrType();
59 class ScalarExprEmitter
60 : public StmtVisitor<ScalarExprEmitter, Value*> {
63 bool IgnoreResultAssign;
64 llvm::LLVMContext &VMContext;
67 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
68 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
69 VMContext(cgf.getLLVMContext()) {
72 //===--------------------------------------------------------------------===//
74 //===--------------------------------------------------------------------===//
76 bool TestAndClearIgnoreResultAssign() {
77 bool I = IgnoreResultAssign;
78 IgnoreResultAssign = false;
82 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
83 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
84 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
85 return CGF.EmitCheckedLValue(E, TCK);
88 void EmitBinOpCheck(Value *Check, const BinOpInfo &Info);
90 Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
91 return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
94 /// EmitLoadOfLValue - Given an expression with complex type that represents a
95 /// value l-value, this method emits the address of the l-value, then loads
96 /// and returns the result.
97 Value *EmitLoadOfLValue(const Expr *E) {
98 return EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
102 /// EmitConversionToBool - Convert the specified expression value to a
103 /// boolean (i1) truth value. This is equivalent to "Val != 0".
104 Value *EmitConversionToBool(Value *Src, QualType DstTy);
106 /// \brief Emit a check that a conversion to or from a floating-point type
107 /// does not overflow.
108 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
109 Value *Src, QualType SrcType,
110 QualType DstType, llvm::Type *DstTy);
112 /// EmitScalarConversion - Emit a conversion from the specified type to the
113 /// specified destination type, both of which are LLVM scalar types.
114 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy);
116 /// EmitComplexToScalarConversion - Emit a conversion from the specified
117 /// complex type to the specified destination type, where the destination type
118 /// is an LLVM scalar type.
119 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
120 QualType SrcTy, QualType DstTy);
122 /// EmitNullValue - Emit a value that corresponds to null for the given type.
123 Value *EmitNullValue(QualType Ty);
125 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
126 Value *EmitFloatToBoolConversion(Value *V) {
127 // Compare against 0.0 for fp scalars.
128 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
129 return Builder.CreateFCmpUNE(V, Zero, "tobool");
132 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
133 Value *EmitPointerToBoolConversion(Value *V) {
134 Value *Zero = llvm::ConstantPointerNull::get(
135 cast<llvm::PointerType>(V->getType()));
136 return Builder.CreateICmpNE(V, Zero, "tobool");
139 Value *EmitIntToBoolConversion(Value *V) {
140 // Because of the type rules of C, we often end up computing a
141 // logical value, then zero extending it to int, then wanting it
142 // as a logical value again. Optimize this common case.
143 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
144 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
145 Value *Result = ZI->getOperand(0);
146 // If there aren't any more uses, zap the instruction to save space.
147 // Note that there can be more uses, for example if this
148 // is the result of an assignment.
150 ZI->eraseFromParent();
155 return Builder.CreateIsNotNull(V, "tobool");
158 //===--------------------------------------------------------------------===//
160 //===--------------------------------------------------------------------===//
162 Value *Visit(Expr *E) {
163 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
166 Value *VisitStmt(Stmt *S) {
167 S->dump(CGF.getContext().getSourceManager());
168 llvm_unreachable("Stmt can't have complex result type!");
170 Value *VisitExpr(Expr *S);
172 Value *VisitParenExpr(ParenExpr *PE) {
173 return Visit(PE->getSubExpr());
175 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
176 return Visit(E->getReplacement());
178 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
179 return Visit(GE->getResultExpr());
183 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
184 return Builder.getInt(E->getValue());
186 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
187 return llvm::ConstantFP::get(VMContext, E->getValue());
189 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
190 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
192 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
193 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
195 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
196 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
198 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
199 return EmitNullValue(E->getType());
201 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
202 return EmitNullValue(E->getType());
204 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
205 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
206 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
207 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
208 return Builder.CreateBitCast(V, ConvertType(E->getType()));
211 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
212 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
215 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
216 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
219 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
221 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E), E->getExprLoc());
223 // Otherwise, assume the mapping is the scalar directly.
224 return CGF.getOpaqueRValueMapping(E).getScalarVal();
228 Value *VisitDeclRefExpr(DeclRefExpr *E) {
229 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
230 if (result.isReference())
231 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E),
233 return result.getValue();
235 return EmitLoadOfLValue(E);
238 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
239 return CGF.EmitObjCSelectorExpr(E);
241 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
242 return CGF.EmitObjCProtocolExpr(E);
244 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
245 return EmitLoadOfLValue(E);
247 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
248 if (E->getMethodDecl() &&
249 E->getMethodDecl()->getReturnType()->isReferenceType())
250 return EmitLoadOfLValue(E);
251 return CGF.EmitObjCMessageExpr(E).getScalarVal();
254 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
255 LValue LV = CGF.EmitObjCIsaExpr(E);
256 Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
260 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
261 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
262 Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
263 Value *VisitMemberExpr(MemberExpr *E);
264 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
265 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
266 return EmitLoadOfLValue(E);
269 Value *VisitInitListExpr(InitListExpr *E);
271 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
272 return EmitNullValue(E->getType());
274 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
275 if (E->getType()->isVariablyModifiedType())
276 CGF.EmitVariablyModifiedType(E->getType());
277 return VisitCastExpr(E);
279 Value *VisitCastExpr(CastExpr *E);
281 Value *VisitCallExpr(const CallExpr *E) {
282 if (E->getCallReturnType()->isReferenceType())
283 return EmitLoadOfLValue(E);
285 return CGF.EmitCallExpr(E).getScalarVal();
288 Value *VisitStmtExpr(const StmtExpr *E);
291 Value *VisitUnaryPostDec(const UnaryOperator *E) {
292 LValue LV = EmitLValue(E->getSubExpr());
293 return EmitScalarPrePostIncDec(E, LV, false, false);
295 Value *VisitUnaryPostInc(const UnaryOperator *E) {
296 LValue LV = EmitLValue(E->getSubExpr());
297 return EmitScalarPrePostIncDec(E, LV, true, false);
299 Value *VisitUnaryPreDec(const UnaryOperator *E) {
300 LValue LV = EmitLValue(E->getSubExpr());
301 return EmitScalarPrePostIncDec(E, LV, false, true);
303 Value *VisitUnaryPreInc(const UnaryOperator *E) {
304 LValue LV = EmitLValue(E->getSubExpr());
305 return EmitScalarPrePostIncDec(E, LV, true, true);
308 llvm::Value *EmitAddConsiderOverflowBehavior(const UnaryOperator *E,
310 llvm::Value *NextVal,
313 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
314 bool isInc, bool isPre);
317 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
318 if (isa<MemberPointerType>(E->getType())) // never sugared
319 return CGF.CGM.getMemberPointerConstant(E);
321 return EmitLValue(E->getSubExpr()).getAddress();
323 Value *VisitUnaryDeref(const UnaryOperator *E) {
324 if (E->getType()->isVoidType())
325 return Visit(E->getSubExpr()); // the actual value should be unused
326 return EmitLoadOfLValue(E);
328 Value *VisitUnaryPlus(const UnaryOperator *E) {
329 // This differs from gcc, though, most likely due to a bug in gcc.
330 TestAndClearIgnoreResultAssign();
331 return Visit(E->getSubExpr());
333 Value *VisitUnaryMinus (const UnaryOperator *E);
334 Value *VisitUnaryNot (const UnaryOperator *E);
335 Value *VisitUnaryLNot (const UnaryOperator *E);
336 Value *VisitUnaryReal (const UnaryOperator *E);
337 Value *VisitUnaryImag (const UnaryOperator *E);
338 Value *VisitUnaryExtension(const UnaryOperator *E) {
339 return Visit(E->getSubExpr());
343 Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
344 return EmitLoadOfLValue(E);
347 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
348 return Visit(DAE->getExpr());
350 Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
351 CodeGenFunction::CXXDefaultInitExprScope Scope(CGF);
352 return Visit(DIE->getExpr());
354 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
355 return CGF.LoadCXXThis();
358 Value *VisitExprWithCleanups(ExprWithCleanups *E) {
359 CGF.enterFullExpression(E);
360 CodeGenFunction::RunCleanupsScope Scope(CGF);
361 return Visit(E->getSubExpr());
363 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
364 return CGF.EmitCXXNewExpr(E);
366 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
367 CGF.EmitCXXDeleteExpr(E);
371 Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
372 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
375 Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
376 return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue());
379 Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
380 return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
383 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
384 // C++ [expr.pseudo]p1:
385 // The result shall only be used as the operand for the function call
386 // operator (), and the result of such a call has type void. The only
387 // effect is the evaluation of the postfix-expression before the dot or
389 CGF.EmitScalarExpr(E->getBase());
393 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
394 return EmitNullValue(E->getType());
397 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
398 CGF.EmitCXXThrowExpr(E);
402 Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
403 return Builder.getInt1(E->getValue());
407 Value *EmitMul(const BinOpInfo &Ops) {
408 if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
409 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
410 case LangOptions::SOB_Defined:
411 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
412 case LangOptions::SOB_Undefined:
413 if (!CGF.SanOpts->SignedIntegerOverflow)
414 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
416 case LangOptions::SOB_Trapping:
417 return EmitOverflowCheckedBinOp(Ops);
421 if (Ops.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
422 return EmitOverflowCheckedBinOp(Ops);
424 if (Ops.LHS->getType()->isFPOrFPVectorTy())
425 return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
426 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
428 /// Create a binary op that checks for overflow.
429 /// Currently only supports +, - and *.
430 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
432 // Check for undefined division and modulus behaviors.
433 void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
434 llvm::Value *Zero,bool isDiv);
435 // Common helper for getting how wide LHS of shift is.
436 static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS);
437 Value *EmitDiv(const BinOpInfo &Ops);
438 Value *EmitRem(const BinOpInfo &Ops);
439 Value *EmitAdd(const BinOpInfo &Ops);
440 Value *EmitSub(const BinOpInfo &Ops);
441 Value *EmitShl(const BinOpInfo &Ops);
442 Value *EmitShr(const BinOpInfo &Ops);
443 Value *EmitAnd(const BinOpInfo &Ops) {
444 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
446 Value *EmitXor(const BinOpInfo &Ops) {
447 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
449 Value *EmitOr (const BinOpInfo &Ops) {
450 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
453 BinOpInfo EmitBinOps(const BinaryOperator *E);
454 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
455 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
458 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
459 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
461 // Binary operators and binary compound assignment operators.
462 #define HANDLEBINOP(OP) \
463 Value *VisitBin ## OP(const BinaryOperator *E) { \
464 return Emit ## OP(EmitBinOps(E)); \
466 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
467 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
482 Value *EmitCompare(const BinaryOperator *E, unsigned UICmpOpc,
483 unsigned SICmpOpc, unsigned FCmpOpc);
484 #define VISITCOMP(CODE, UI, SI, FP) \
485 Value *VisitBin##CODE(const BinaryOperator *E) { \
486 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
487 llvm::FCmpInst::FP); }
488 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
489 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
490 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
491 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
492 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
493 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
496 Value *VisitBinAssign (const BinaryOperator *E);
498 Value *VisitBinLAnd (const BinaryOperator *E);
499 Value *VisitBinLOr (const BinaryOperator *E);
500 Value *VisitBinComma (const BinaryOperator *E);
502 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
503 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
506 Value *VisitBlockExpr(const BlockExpr *BE);
507 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
508 Value *VisitChooseExpr(ChooseExpr *CE);
509 Value *VisitVAArgExpr(VAArgExpr *VE);
510 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
511 return CGF.EmitObjCStringLiteral(E);
513 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
514 return CGF.EmitObjCBoxedExpr(E);
516 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
517 return CGF.EmitObjCArrayLiteral(E);
519 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
520 return CGF.EmitObjCDictionaryLiteral(E);
522 Value *VisitAsTypeExpr(AsTypeExpr *CE);
523 Value *VisitAtomicExpr(AtomicExpr *AE);
525 } // end anonymous namespace.
527 //===----------------------------------------------------------------------===//
529 //===----------------------------------------------------------------------===//
531 /// EmitConversionToBool - Convert the specified expression value to a
532 /// boolean (i1) truth value. This is equivalent to "Val != 0".
533 Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
534 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
536 if (SrcType->isRealFloatingType())
537 return EmitFloatToBoolConversion(Src);
539 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
540 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
542 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
543 "Unknown scalar type to convert");
545 if (isa<llvm::IntegerType>(Src->getType()))
546 return EmitIntToBoolConversion(Src);
548 assert(isa<llvm::PointerType>(Src->getType()));
549 return EmitPointerToBoolConversion(Src);
552 void ScalarExprEmitter::EmitFloatConversionCheck(Value *OrigSrc,
553 QualType OrigSrcType,
554 Value *Src, QualType SrcType,
557 CodeGenFunction::SanitizerScope SanScope(&CGF);
561 llvm::Type *SrcTy = Src->getType();
563 llvm::Value *Check = nullptr;
564 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
565 // Integer to floating-point. This can fail for unsigned short -> __half
566 // or unsigned __int128 -> float.
567 assert(DstType->isFloatingType());
568 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
570 APFloat LargestFloat =
571 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
572 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
575 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
576 &IsExact) != APFloat::opOK)
577 // The range of representable values of this floating point type includes
578 // all values of this integer type. Don't need an overflow check.
581 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
583 Check = Builder.CreateICmpULE(Src, Max);
585 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
586 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
587 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
588 Check = Builder.CreateAnd(GE, LE);
591 const llvm::fltSemantics &SrcSema =
592 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
593 if (isa<llvm::IntegerType>(DstTy)) {
594 // Floating-point to integer. This has undefined behavior if the source is
595 // +-Inf, NaN, or doesn't fit into the destination type (after truncation
597 unsigned Width = CGF.getContext().getIntWidth(DstType);
598 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
600 APSInt Min = APSInt::getMinValue(Width, Unsigned);
601 APFloat MinSrc(SrcSema, APFloat::uninitialized);
602 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
604 // Don't need an overflow check for lower bound. Just check for
606 MinSrc = APFloat::getInf(SrcSema, true);
608 // Find the largest value which is too small to represent (before
609 // truncation toward zero).
610 MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
612 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
613 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
614 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
616 // Don't need an overflow check for upper bound. Just check for
618 MaxSrc = APFloat::getInf(SrcSema, false);
620 // Find the smallest value which is too large to represent (before
621 // truncation toward zero).
622 MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
624 // If we're converting from __half, convert the range to float to match
626 if (OrigSrcType->isHalfType()) {
627 const llvm::fltSemantics &Sema =
628 CGF.getContext().getFloatTypeSemantics(SrcType);
630 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
631 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
635 Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
637 Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
638 Check = Builder.CreateAnd(GE, LE);
640 // FIXME: Maybe split this sanitizer out from float-cast-overflow.
642 // Floating-point to floating-point. This has undefined behavior if the
643 // source is not in the range of representable values of the destination
644 // type. The C and C++ standards are spectacularly unclear here. We
645 // diagnose finite out-of-range conversions, but allow infinities and NaNs
646 // to convert to the corresponding value in the smaller type.
648 // C11 Annex F gives all such conversions defined behavior for IEC 60559
649 // conforming implementations. Unfortunately, LLVM's fptrunc instruction
652 // Converting from a lower rank to a higher rank can never have
653 // undefined behavior, since higher-rank types must have a superset
654 // of values of lower-rank types.
655 if (CGF.getContext().getFloatingTypeOrder(OrigSrcType, DstType) != 1)
658 assert(!OrigSrcType->isHalfType() &&
659 "should not check conversion from __half, it has the lowest rank");
661 const llvm::fltSemantics &DstSema =
662 CGF.getContext().getFloatTypeSemantics(DstType);
663 APFloat MinBad = APFloat::getLargest(DstSema, false);
664 APFloat MaxBad = APFloat::getInf(DstSema, false);
667 MinBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
668 MaxBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
670 Value *AbsSrc = CGF.EmitNounwindRuntimeCall(
671 CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Src->getType()), Src);
673 Builder.CreateFCmpOGT(AbsSrc, llvm::ConstantFP::get(VMContext, MinBad));
675 Builder.CreateFCmpOLT(AbsSrc, llvm::ConstantFP::get(VMContext, MaxBad));
676 Check = Builder.CreateNot(Builder.CreateAnd(GE, LE));
680 // FIXME: Provide a SourceLocation.
681 llvm::Constant *StaticArgs[] = {
682 CGF.EmitCheckTypeDescriptor(OrigSrcType),
683 CGF.EmitCheckTypeDescriptor(DstType)
685 CGF.EmitCheck(Check, "float_cast_overflow", StaticArgs, OrigSrc,
686 CodeGenFunction::CRK_Recoverable);
689 /// EmitScalarConversion - Emit a conversion from the specified type to the
690 /// specified destination type, both of which are LLVM scalar types.
691 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
693 SrcType = CGF.getContext().getCanonicalType(SrcType);
694 DstType = CGF.getContext().getCanonicalType(DstType);
695 if (SrcType == DstType) return Src;
697 if (DstType->isVoidType()) return nullptr;
699 llvm::Value *OrigSrc = Src;
700 QualType OrigSrcType = SrcType;
701 llvm::Type *SrcTy = Src->getType();
703 // If casting to/from storage-only half FP, use special intrinsics.
704 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
705 Src = Builder.CreateCall(
706 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
709 SrcType = CGF.getContext().FloatTy;
713 // Handle conversions to bool first, they are special: comparisons against 0.
714 if (DstType->isBooleanType())
715 return EmitConversionToBool(Src, SrcType);
717 llvm::Type *DstTy = ConvertType(DstType);
719 // Ignore conversions like int -> uint.
723 // Handle pointer conversions next: pointers can only be converted to/from
724 // other pointers and integers. Check for pointer types in terms of LLVM, as
725 // some native types (like Obj-C id) may map to a pointer type.
726 if (isa<llvm::PointerType>(DstTy)) {
727 // The source value may be an integer, or a pointer.
728 if (isa<llvm::PointerType>(SrcTy))
729 return Builder.CreateBitCast(Src, DstTy, "conv");
731 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
732 // First, convert to the correct width so that we control the kind of
734 llvm::Type *MiddleTy = CGF.IntPtrTy;
735 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
736 llvm::Value* IntResult =
737 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
738 // Then, cast to pointer.
739 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
742 if (isa<llvm::PointerType>(SrcTy)) {
743 // Must be an ptr to int cast.
744 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
745 return Builder.CreatePtrToInt(Src, DstTy, "conv");
748 // A scalar can be splatted to an extended vector of the same element type
749 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
750 // Cast the scalar to element type
751 QualType EltTy = DstType->getAs<ExtVectorType>()->getElementType();
752 llvm::Value *Elt = EmitScalarConversion(Src, SrcType, EltTy);
754 // Splat the element across to all elements
755 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
756 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
759 // Allow bitcast from vector to integer/fp of the same size.
760 if (isa<llvm::VectorType>(SrcTy) ||
761 isa<llvm::VectorType>(DstTy))
762 return Builder.CreateBitCast(Src, DstTy, "conv");
764 // Finally, we have the arithmetic types: real int/float.
765 Value *Res = nullptr;
766 llvm::Type *ResTy = DstTy;
768 // An overflowing conversion has undefined behavior if either the source type
769 // or the destination type is a floating-point type.
770 if (CGF.SanOpts->FloatCastOverflow &&
771 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
772 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType,
775 // Cast to half via float
776 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
779 if (isa<llvm::IntegerType>(SrcTy)) {
780 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
781 if (isa<llvm::IntegerType>(DstTy))
782 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
783 else if (InputSigned)
784 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
786 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
787 } else if (isa<llvm::IntegerType>(DstTy)) {
788 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
789 if (DstType->isSignedIntegerOrEnumerationType())
790 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
792 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
794 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
795 "Unknown real conversion");
796 if (DstTy->getTypeID() < SrcTy->getTypeID())
797 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
799 Res = Builder.CreateFPExt(Src, DstTy, "conv");
802 if (DstTy != ResTy) {
803 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
804 Res = Builder.CreateCall(
805 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy),
812 /// EmitComplexToScalarConversion - Emit a conversion from the specified complex
813 /// type to the specified destination type, where the destination type is an
814 /// LLVM scalar type.
815 Value *ScalarExprEmitter::
816 EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
817 QualType SrcTy, QualType DstTy) {
818 // Get the source element type.
819 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
821 // Handle conversions to bool first, they are special: comparisons against 0.
822 if (DstTy->isBooleanType()) {
823 // Complex != 0 -> (Real != 0) | (Imag != 0)
824 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy);
825 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy);
826 return Builder.CreateOr(Src.first, Src.second, "tobool");
829 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
830 // the imaginary part of the complex value is discarded and the value of the
831 // real part is converted according to the conversion rules for the
832 // corresponding real type.
833 return EmitScalarConversion(Src.first, SrcTy, DstTy);
836 Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
837 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
840 /// \brief Emit a sanitization check for the given "binary" operation (which
841 /// might actually be a unary increment which has been lowered to a binary
842 /// operation). The check passes if \p Check, which is an \c i1, is \c true.
843 void ScalarExprEmitter::EmitBinOpCheck(Value *Check, const BinOpInfo &Info) {
844 assert(CGF.IsSanitizerScope);
846 SmallVector<llvm::Constant *, 4> StaticData;
847 SmallVector<llvm::Value *, 2> DynamicData;
849 BinaryOperatorKind Opcode = Info.Opcode;
850 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
851 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
853 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
854 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
855 if (UO && UO->getOpcode() == UO_Minus) {
856 CheckName = "negate_overflow";
857 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
858 DynamicData.push_back(Info.RHS);
860 if (BinaryOperator::isShiftOp(Opcode)) {
861 // Shift LHS negative or too large, or RHS out of bounds.
862 CheckName = "shift_out_of_bounds";
863 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
864 StaticData.push_back(
865 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
866 StaticData.push_back(
867 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
868 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
869 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
870 CheckName = "divrem_overflow";
871 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
873 // Signed arithmetic overflow (+, -, *).
875 case BO_Add: CheckName = "add_overflow"; break;
876 case BO_Sub: CheckName = "sub_overflow"; break;
877 case BO_Mul: CheckName = "mul_overflow"; break;
878 default: llvm_unreachable("unexpected opcode for bin op check");
880 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
882 DynamicData.push_back(Info.LHS);
883 DynamicData.push_back(Info.RHS);
886 CGF.EmitCheck(Check, CheckName, StaticData, DynamicData,
887 CodeGenFunction::CRK_Recoverable);
890 //===----------------------------------------------------------------------===//
892 //===----------------------------------------------------------------------===//
894 Value *ScalarExprEmitter::VisitExpr(Expr *E) {
895 CGF.ErrorUnsupported(E, "scalar expression");
896 if (E->getType()->isVoidType())
898 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
901 Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
903 if (E->getNumSubExprs() == 2 ||
904 (E->getNumSubExprs() == 3 && E->getExpr(2)->getType()->isVectorType())) {
905 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
906 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
909 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
910 unsigned LHSElts = LTy->getNumElements();
912 if (E->getNumSubExprs() == 3) {
913 Mask = CGF.EmitScalarExpr(E->getExpr(2));
915 // Shuffle LHS & RHS into one input vector.
916 SmallVector<llvm::Constant*, 32> concat;
917 for (unsigned i = 0; i != LHSElts; ++i) {
918 concat.push_back(Builder.getInt32(2*i));
919 concat.push_back(Builder.getInt32(2*i+1));
922 Value* CV = llvm::ConstantVector::get(concat);
923 LHS = Builder.CreateShuffleVector(LHS, RHS, CV, "concat");
929 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
930 llvm::Constant* EltMask;
932 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
933 llvm::NextPowerOf2(LHSElts-1)-1);
935 // Mask off the high bits of each shuffle index.
936 Value *MaskBits = llvm::ConstantVector::getSplat(MTy->getNumElements(),
938 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
941 // mask = mask & maskbits
943 // n = extract mask i
945 // newv = insert newv, x, i
946 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
947 MTy->getNumElements());
948 Value* NewV = llvm::UndefValue::get(RTy);
949 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
950 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
951 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
953 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
954 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
959 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
960 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
962 SmallVector<llvm::Constant*, 32> indices;
963 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
964 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
965 // Check for -1 and output it as undef in the IR.
966 if (Idx.isSigned() && Idx.isAllOnesValue())
967 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
969 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
972 Value *SV = llvm::ConstantVector::get(indices);
973 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
976 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
977 QualType SrcType = E->getSrcExpr()->getType(),
978 DstType = E->getType();
980 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
982 SrcType = CGF.getContext().getCanonicalType(SrcType);
983 DstType = CGF.getContext().getCanonicalType(DstType);
984 if (SrcType == DstType) return Src;
986 assert(SrcType->isVectorType() &&
987 "ConvertVector source type must be a vector");
988 assert(DstType->isVectorType() &&
989 "ConvertVector destination type must be a vector");
991 llvm::Type *SrcTy = Src->getType();
992 llvm::Type *DstTy = ConvertType(DstType);
994 // Ignore conversions like int -> uint.
998 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
999 DstEltType = DstType->getAs<VectorType>()->getElementType();
1001 assert(SrcTy->isVectorTy() &&
1002 "ConvertVector source IR type must be a vector");
1003 assert(DstTy->isVectorTy() &&
1004 "ConvertVector destination IR type must be a vector");
1006 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1007 *DstEltTy = DstTy->getVectorElementType();
1009 if (DstEltType->isBooleanType()) {
1010 assert((SrcEltTy->isFloatingPointTy() ||
1011 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1013 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1014 if (SrcEltTy->isFloatingPointTy()) {
1015 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1017 return Builder.CreateICmpNE(Src, Zero, "tobool");
1021 // We have the arithmetic types: real int/float.
1022 Value *Res = nullptr;
1024 if (isa<llvm::IntegerType>(SrcEltTy)) {
1025 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1026 if (isa<llvm::IntegerType>(DstEltTy))
1027 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1028 else if (InputSigned)
1029 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1031 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1032 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1033 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1034 if (DstEltType->isSignedIntegerOrEnumerationType())
1035 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1037 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1039 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1040 "Unknown real conversion");
1041 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1042 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1044 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1050 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1052 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1054 CGF.EmitScalarExpr(E->getBase());
1056 EmitLValue(E->getBase());
1057 return Builder.getInt(Value);
1060 return EmitLoadOfLValue(E);
1063 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1064 TestAndClearIgnoreResultAssign();
1066 // Emit subscript expressions in rvalue context's. For most cases, this just
1067 // loads the lvalue formed by the subscript expr. However, we have to be
1068 // careful, because the base of a vector subscript is occasionally an rvalue,
1069 // so we can't get it as an lvalue.
1070 if (!E->getBase()->getType()->isVectorType())
1071 return EmitLoadOfLValue(E);
1073 // Handle the vector case. The base must be a vector, the index must be an
1075 Value *Base = Visit(E->getBase());
1076 Value *Idx = Visit(E->getIdx());
1077 QualType IdxTy = E->getIdx()->getType();
1079 if (CGF.SanOpts->ArrayBounds)
1080 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1082 return Builder.CreateExtractElement(Base, Idx, "vecext");
1085 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1086 unsigned Off, llvm::Type *I32Ty) {
1087 int MV = SVI->getMaskValue(Idx);
1089 return llvm::UndefValue::get(I32Ty);
1090 return llvm::ConstantInt::get(I32Ty, Off+MV);
1093 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1094 bool Ignore = TestAndClearIgnoreResultAssign();
1096 assert (Ignore == false && "init list ignored");
1097 unsigned NumInitElements = E->getNumInits();
1099 if (E->hadArrayRangeDesignator())
1100 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1102 llvm::VectorType *VType =
1103 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1106 if (NumInitElements == 0) {
1107 // C++11 value-initialization for the scalar.
1108 return EmitNullValue(E->getType());
1110 // We have a scalar in braces. Just use the first element.
1111 return Visit(E->getInit(0));
1114 unsigned ResElts = VType->getNumElements();
1116 // Loop over initializers collecting the Value for each, and remembering
1117 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1118 // us to fold the shuffle for the swizzle into the shuffle for the vector
1119 // initializer, since LLVM optimizers generally do not want to touch
1121 unsigned CurIdx = 0;
1122 bool VIsUndefShuffle = false;
1123 llvm::Value *V = llvm::UndefValue::get(VType);
1124 for (unsigned i = 0; i != NumInitElements; ++i) {
1125 Expr *IE = E->getInit(i);
1126 Value *Init = Visit(IE);
1127 SmallVector<llvm::Constant*, 16> Args;
1129 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1131 // Handle scalar elements. If the scalar initializer is actually one
1132 // element of a different vector of the same width, use shuffle instead of
1135 if (isa<ExtVectorElementExpr>(IE)) {
1136 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1138 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1139 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1140 Value *LHS = nullptr, *RHS = nullptr;
1142 // insert into undef -> shuffle (src, undef)
1144 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1146 LHS = EI->getVectorOperand();
1148 VIsUndefShuffle = true;
1149 } else if (VIsUndefShuffle) {
1150 // insert into undefshuffle && size match -> shuffle (v, src)
1151 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1152 for (unsigned j = 0; j != CurIdx; ++j)
1153 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1154 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1155 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1157 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1158 RHS = EI->getVectorOperand();
1159 VIsUndefShuffle = false;
1161 if (!Args.empty()) {
1162 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1163 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1169 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1171 VIsUndefShuffle = false;
1176 unsigned InitElts = VVT->getNumElements();
1178 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1179 // input is the same width as the vector being constructed, generate an
1180 // optimized shuffle of the swizzle input into the result.
1181 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1182 if (isa<ExtVectorElementExpr>(IE)) {
1183 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1184 Value *SVOp = SVI->getOperand(0);
1185 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1187 if (OpTy->getNumElements() == ResElts) {
1188 for (unsigned j = 0; j != CurIdx; ++j) {
1189 // If the current vector initializer is a shuffle with undef, merge
1190 // this shuffle directly into it.
1191 if (VIsUndefShuffle) {
1192 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1195 Args.push_back(Builder.getInt32(j));
1198 for (unsigned j = 0, je = InitElts; j != je; ++j)
1199 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1200 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1202 if (VIsUndefShuffle)
1203 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1209 // Extend init to result vector length, and then shuffle its contribution
1210 // to the vector initializer into V.
1212 for (unsigned j = 0; j != InitElts; ++j)
1213 Args.push_back(Builder.getInt32(j));
1214 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1215 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1216 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1220 for (unsigned j = 0; j != CurIdx; ++j)
1221 Args.push_back(Builder.getInt32(j));
1222 for (unsigned j = 0; j != InitElts; ++j)
1223 Args.push_back(Builder.getInt32(j+Offset));
1224 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1227 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1228 // merging subsequent shuffles into this one.
1231 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1232 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1233 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1237 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1238 // Emit remaining default initializers.
1239 llvm::Type *EltTy = VType->getElementType();
1241 // Emit remaining default initializers
1242 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1243 Value *Idx = Builder.getInt32(CurIdx);
1244 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1245 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1250 static bool ShouldNullCheckClassCastValue(const CastExpr *CE) {
1251 const Expr *E = CE->getSubExpr();
1253 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1256 if (isa<CXXThisExpr>(E)) {
1257 // We always assume that 'this' is never null.
1261 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1262 // And that glvalue casts are never null.
1263 if (ICE->getValueKind() != VK_RValue)
1270 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1271 // have to handle a more broad range of conversions than explicit casts, as they
1272 // handle things like function to ptr-to-function decay etc.
1273 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1274 Expr *E = CE->getSubExpr();
1275 QualType DestTy = CE->getType();
1276 CastKind Kind = CE->getCastKind();
1278 if (!DestTy->isVoidType())
1279 TestAndClearIgnoreResultAssign();
1281 // Since almost all cast kinds apply to scalars, this switch doesn't have
1282 // a default case, so the compiler will warn on a missing case. The cases
1283 // are in the same order as in the CastKind enum.
1285 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1286 case CK_BuiltinFnToFnPtr:
1287 llvm_unreachable("builtin functions are handled elsewhere");
1289 case CK_LValueBitCast:
1290 case CK_ObjCObjectLValueCast: {
1291 Value *V = EmitLValue(E).getAddress();
1292 V = Builder.CreateBitCast(V,
1293 ConvertType(CGF.getContext().getPointerType(DestTy)));
1294 return EmitLoadOfLValue(CGF.MakeNaturalAlignAddrLValue(V, DestTy),
1298 case CK_CPointerToObjCPointerCast:
1299 case CK_BlockPointerToObjCPointerCast:
1300 case CK_AnyPointerToBlockPointerCast:
1302 Value *Src = Visit(const_cast<Expr*>(E));
1303 llvm::Type *SrcTy = Src->getType();
1304 llvm::Type *DstTy = ConvertType(DestTy);
1305 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1306 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1307 llvm::Type *MidTy = CGF.CGM.getDataLayout().getIntPtrType(SrcTy);
1308 return Builder.CreateIntToPtr(Builder.CreatePtrToInt(Src, MidTy), DstTy);
1310 return Builder.CreateBitCast(Src, DstTy);
1312 case CK_AddressSpaceConversion: {
1313 Value *Src = Visit(const_cast<Expr*>(E));
1314 return Builder.CreateAddrSpaceCast(Src, ConvertType(DestTy));
1316 case CK_AtomicToNonAtomic:
1317 case CK_NonAtomicToAtomic:
1319 case CK_UserDefinedConversion:
1320 return Visit(const_cast<Expr*>(E));
1322 case CK_BaseToDerived: {
1323 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1324 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1326 llvm::Value *V = Visit(E);
1328 llvm::Value *Derived =
1329 CGF.GetAddressOfDerivedClass(V, DerivedClassDecl,
1330 CE->path_begin(), CE->path_end(),
1331 ShouldNullCheckClassCastValue(CE));
1333 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1334 // performed and the object is not of the derived type.
1335 if (CGF.sanitizePerformTypeCheck())
1336 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1337 Derived, DestTy->getPointeeType());
1341 case CK_UncheckedDerivedToBase:
1342 case CK_DerivedToBase: {
1343 const CXXRecordDecl *DerivedClassDecl =
1344 E->getType()->getPointeeCXXRecordDecl();
1345 assert(DerivedClassDecl && "DerivedToBase arg isn't a C++ object pointer!");
1347 return CGF.GetAddressOfBaseClass(Visit(E), DerivedClassDecl,
1348 CE->path_begin(), CE->path_end(),
1349 ShouldNullCheckClassCastValue(CE));
1352 Value *V = Visit(const_cast<Expr*>(E));
1353 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1354 return CGF.EmitDynamicCast(V, DCE);
1357 case CK_ArrayToPointerDecay: {
1358 assert(E->getType()->isArrayType() &&
1359 "Array to pointer decay must have array source type!");
1361 Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays.
1363 // Note that VLA pointers are always decayed, so we don't need to do
1365 if (!E->getType()->isVariableArrayType()) {
1366 assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer");
1367 assert(isa<llvm::ArrayType>(cast<llvm::PointerType>(V->getType())
1368 ->getElementType()) &&
1369 "Expected pointer to array");
1370 V = Builder.CreateStructGEP(V, 0, "arraydecay");
1373 // Make sure the array decay ends up being the right type. This matters if
1374 // the array type was of an incomplete type.
1375 return CGF.Builder.CreatePointerCast(V, ConvertType(CE->getType()));
1377 case CK_FunctionToPointerDecay:
1378 return EmitLValue(E).getAddress();
1380 case CK_NullToPointer:
1381 if (MustVisitNullValue(E))
1384 return llvm::ConstantPointerNull::get(
1385 cast<llvm::PointerType>(ConvertType(DestTy)));
1387 case CK_NullToMemberPointer: {
1388 if (MustVisitNullValue(E))
1391 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1392 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1395 case CK_ReinterpretMemberPointer:
1396 case CK_BaseToDerivedMemberPointer:
1397 case CK_DerivedToBaseMemberPointer: {
1398 Value *Src = Visit(E);
1400 // Note that the AST doesn't distinguish between checked and
1401 // unchecked member pointer conversions, so we always have to
1402 // implement checked conversions here. This is inefficient when
1403 // actual control flow may be required in order to perform the
1404 // check, which it is for data member pointers (but not member
1405 // function pointers on Itanium and ARM).
1406 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1409 case CK_ARCProduceObject:
1410 return CGF.EmitARCRetainScalarExpr(E);
1411 case CK_ARCConsumeObject:
1412 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1413 case CK_ARCReclaimReturnedObject: {
1414 llvm::Value *value = Visit(E);
1415 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
1416 return CGF.EmitObjCConsumeObject(E->getType(), value);
1418 case CK_ARCExtendBlockObject:
1419 return CGF.EmitARCExtendBlockObject(E);
1421 case CK_CopyAndAutoreleaseBlockObject:
1422 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1424 case CK_FloatingRealToComplex:
1425 case CK_FloatingComplexCast:
1426 case CK_IntegralRealToComplex:
1427 case CK_IntegralComplexCast:
1428 case CK_IntegralComplexToFloatingComplex:
1429 case CK_FloatingComplexToIntegralComplex:
1430 case CK_ConstructorConversion:
1432 llvm_unreachable("scalar cast to non-scalar value");
1434 case CK_LValueToRValue:
1435 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1436 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1437 return Visit(const_cast<Expr*>(E));
1439 case CK_IntegralToPointer: {
1440 Value *Src = Visit(const_cast<Expr*>(E));
1442 // First, convert to the correct width so that we control the kind of
1444 llvm::Type *MiddleTy = CGF.IntPtrTy;
1445 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1446 llvm::Value* IntResult =
1447 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1449 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
1451 case CK_PointerToIntegral:
1452 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1453 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1456 CGF.EmitIgnoredExpr(E);
1459 case CK_VectorSplat: {
1460 llvm::Type *DstTy = ConvertType(DestTy);
1461 Value *Elt = Visit(const_cast<Expr*>(E));
1462 Elt = EmitScalarConversion(Elt, E->getType(),
1463 DestTy->getAs<VectorType>()->getElementType());
1465 // Splat the element across to all elements
1466 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
1467 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1470 case CK_IntegralCast:
1471 case CK_IntegralToFloating:
1472 case CK_FloatingToIntegral:
1473 case CK_FloatingCast:
1474 return EmitScalarConversion(Visit(E), E->getType(), DestTy);
1475 case CK_IntegralToBoolean:
1476 return EmitIntToBoolConversion(Visit(E));
1477 case CK_PointerToBoolean:
1478 return EmitPointerToBoolConversion(Visit(E));
1479 case CK_FloatingToBoolean:
1480 return EmitFloatToBoolConversion(Visit(E));
1481 case CK_MemberPointerToBoolean: {
1482 llvm::Value *MemPtr = Visit(E);
1483 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1484 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1487 case CK_FloatingComplexToReal:
1488 case CK_IntegralComplexToReal:
1489 return CGF.EmitComplexExpr(E, false, true).first;
1491 case CK_FloatingComplexToBoolean:
1492 case CK_IntegralComplexToBoolean: {
1493 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1495 // TODO: kill this function off, inline appropriate case here
1496 return EmitComplexToScalarConversion(V, E->getType(), DestTy);
1499 case CK_ZeroToOCLEvent: {
1500 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1501 return llvm::Constant::getNullValue(ConvertType(DestTy));
1506 llvm_unreachable("unknown scalar cast");
1509 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1510 CodeGenFunction::StmtExprEvaluation eval(CGF);
1511 llvm::Value *RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1512 !E->getType()->isVoidType());
1515 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1519 //===----------------------------------------------------------------------===//
1521 //===----------------------------------------------------------------------===//
1523 llvm::Value *ScalarExprEmitter::
1524 EmitAddConsiderOverflowBehavior(const UnaryOperator *E,
1526 llvm::Value *NextVal, bool IsInc) {
1527 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1528 case LangOptions::SOB_Defined:
1529 return Builder.CreateAdd(InVal, NextVal, IsInc ? "inc" : "dec");
1530 case LangOptions::SOB_Undefined:
1531 if (!CGF.SanOpts->SignedIntegerOverflow)
1532 return Builder.CreateNSWAdd(InVal, NextVal, IsInc ? "inc" : "dec");
1534 case LangOptions::SOB_Trapping:
1537 BinOp.RHS = NextVal;
1538 BinOp.Ty = E->getType();
1539 BinOp.Opcode = BO_Add;
1540 BinOp.FPContractable = false;
1542 return EmitOverflowCheckedBinOp(BinOp);
1544 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1548 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1549 bool isInc, bool isPre) {
1551 QualType type = E->getSubExpr()->getType();
1552 llvm::PHINode *atomicPHI = nullptr;
1556 int amount = (isInc ? 1 : -1);
1558 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1559 type = atomicTy->getValueType();
1560 if (isInc && type->isBooleanType()) {
1561 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1563 Builder.Insert(new llvm::StoreInst(True,
1564 LV.getAddress(), LV.isVolatileQualified(),
1565 LV.getAlignment().getQuantity(),
1566 llvm::SequentiallyConsistent));
1567 return Builder.getTrue();
1569 // For atomic bool increment, we just store true and return it for
1570 // preincrement, do an atomic swap with true for postincrement
1571 return Builder.CreateAtomicRMW(llvm::AtomicRMWInst::Xchg,
1572 LV.getAddress(), True, llvm::SequentiallyConsistent);
1574 // Special case for atomic increment / decrement on integers, emit
1575 // atomicrmw instructions. We skip this if we want to be doing overflow
1576 // checking, and fall into the slow path with the atomic cmpxchg loop.
1577 if (!type->isBooleanType() && type->isIntegerType() &&
1578 !(type->isUnsignedIntegerType() &&
1579 CGF.SanOpts->UnsignedIntegerOverflow) &&
1580 CGF.getLangOpts().getSignedOverflowBehavior() !=
1581 LangOptions::SOB_Trapping) {
1582 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1583 llvm::AtomicRMWInst::Sub;
1584 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1585 llvm::Instruction::Sub;
1586 llvm::Value *amt = CGF.EmitToMemory(
1587 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1588 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1589 LV.getAddress(), amt, llvm::SequentiallyConsistent);
1590 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1592 value = EmitLoadOfLValue(LV, E->getExprLoc());
1594 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1595 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1596 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1597 value = CGF.EmitToMemory(value, type);
1598 Builder.CreateBr(opBB);
1599 Builder.SetInsertPoint(opBB);
1600 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1601 atomicPHI->addIncoming(value, startBB);
1604 value = EmitLoadOfLValue(LV, E->getExprLoc());
1608 // Special case of integer increment that we have to check first: bool++.
1609 // Due to promotion rules, we get:
1610 // bool++ -> bool = bool + 1
1611 // -> bool = (int)bool + 1
1612 // -> bool = ((int)bool + 1 != 0)
1613 // An interesting aspect of this is that increment is always true.
1614 // Decrement does not have this property.
1615 if (isInc && type->isBooleanType()) {
1616 value = Builder.getTrue();
1618 // Most common case by far: integer increment.
1619 } else if (type->isIntegerType()) {
1621 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1623 // Note that signed integer inc/dec with width less than int can't
1624 // overflow because of promotion rules; we're just eliding a few steps here.
1625 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1626 CGF.IntTy->getIntegerBitWidth();
1627 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1628 value = EmitAddConsiderOverflowBehavior(E, value, amt, isInc);
1629 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1630 CGF.SanOpts->UnsignedIntegerOverflow) {
1633 BinOp.RHS = llvm::ConstantInt::get(value->getType(), 1, false);
1634 BinOp.Ty = E->getType();
1635 BinOp.Opcode = isInc ? BO_Add : BO_Sub;
1636 BinOp.FPContractable = false;
1638 value = EmitOverflowCheckedBinOp(BinOp);
1640 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1642 // Next most common: pointer increment.
1643 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1644 QualType type = ptr->getPointeeType();
1646 // VLA types don't have constant size.
1647 if (const VariableArrayType *vla
1648 = CGF.getContext().getAsVariableArrayType(type)) {
1649 llvm::Value *numElts = CGF.getVLASize(vla).first;
1650 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1651 if (CGF.getLangOpts().isSignedOverflowDefined())
1652 value = Builder.CreateGEP(value, numElts, "vla.inc");
1654 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1656 // Arithmetic on function pointers (!) is just +-1.
1657 } else if (type->isFunctionType()) {
1658 llvm::Value *amt = Builder.getInt32(amount);
1660 value = CGF.EmitCastToVoidPtr(value);
1661 if (CGF.getLangOpts().isSignedOverflowDefined())
1662 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1664 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1665 value = Builder.CreateBitCast(value, input->getType());
1667 // For everything else, we can just do a simple increment.
1669 llvm::Value *amt = Builder.getInt32(amount);
1670 if (CGF.getLangOpts().isSignedOverflowDefined())
1671 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1673 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1676 // Vector increment/decrement.
1677 } else if (type->isVectorType()) {
1678 if (type->hasIntegerRepresentation()) {
1679 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1681 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1683 value = Builder.CreateFAdd(
1685 llvm::ConstantFP::get(value->getType(), amount),
1686 isInc ? "inc" : "dec");
1690 } else if (type->isRealFloatingType()) {
1691 // Add the inc/dec to the real part.
1694 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1695 // Another special case: half FP increment should be done via float
1696 value = Builder.CreateCall(
1697 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1702 if (value->getType()->isFloatTy())
1703 amt = llvm::ConstantFP::get(VMContext,
1704 llvm::APFloat(static_cast<float>(amount)));
1705 else if (value->getType()->isDoubleTy())
1706 amt = llvm::ConstantFP::get(VMContext,
1707 llvm::APFloat(static_cast<double>(amount)));
1709 llvm::APFloat F(static_cast<float>(amount));
1711 F.convert(CGF.getTarget().getLongDoubleFormat(),
1712 llvm::APFloat::rmTowardZero, &ignored);
1713 amt = llvm::ConstantFP::get(VMContext, F);
1715 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1717 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
1718 value = Builder.CreateCall(
1719 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
1723 // Objective-C pointer types.
1725 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1726 value = CGF.EmitCastToVoidPtr(value);
1728 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1729 if (!isInc) size = -size;
1730 llvm::Value *sizeValue =
1731 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1733 if (CGF.getLangOpts().isSignedOverflowDefined())
1734 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1736 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
1737 value = Builder.CreateBitCast(value, input->getType());
1741 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1742 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1743 llvm::Value *pair = Builder.CreateAtomicCmpXchg(
1744 LV.getAddress(), atomicPHI, CGF.EmitToMemory(value, type),
1745 llvm::SequentiallyConsistent, llvm::SequentiallyConsistent);
1746 llvm::Value *old = Builder.CreateExtractValue(pair, 0);
1747 llvm::Value *success = Builder.CreateExtractValue(pair, 1);
1748 atomicPHI->addIncoming(old, opBB);
1749 Builder.CreateCondBr(success, contBB, opBB);
1750 Builder.SetInsertPoint(contBB);
1751 return isPre ? value : input;
1754 // Store the updated result through the lvalue.
1755 if (LV.isBitField())
1756 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
1758 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
1760 // If this is a postinc, return the value read from memory, otherwise use the
1762 return isPre ? value : input;
1767 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
1768 TestAndClearIgnoreResultAssign();
1769 // Emit unary minus with EmitSub so we handle overflow cases etc.
1771 BinOp.RHS = Visit(E->getSubExpr());
1773 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1774 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1776 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
1777 BinOp.Ty = E->getType();
1778 BinOp.Opcode = BO_Sub;
1779 BinOp.FPContractable = false;
1781 return EmitSub(BinOp);
1784 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
1785 TestAndClearIgnoreResultAssign();
1786 Value *Op = Visit(E->getSubExpr());
1787 return Builder.CreateNot(Op, "neg");
1790 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1791 // Perform vector logical not on comparison with zero vector.
1792 if (E->getType()->isExtVectorType()) {
1793 Value *Oper = Visit(E->getSubExpr());
1794 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1796 if (Oper->getType()->isFPOrFPVectorTy())
1797 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1799 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1800 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1803 // Compare operand to zero.
1804 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
1807 // TODO: Could dynamically modify easy computations here. For example, if
1808 // the operand is an icmp ne, turn into icmp eq.
1809 BoolVal = Builder.CreateNot(BoolVal, "lnot");
1811 // ZExt result to the expr type.
1812 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
1815 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1816 // Try folding the offsetof to a constant.
1818 if (E->EvaluateAsInt(Value, CGF.getContext()))
1819 return Builder.getInt(Value);
1821 // Loop over the components of the offsetof to compute the value.
1822 unsigned n = E->getNumComponents();
1823 llvm::Type* ResultType = ConvertType(E->getType());
1824 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1825 QualType CurrentType = E->getTypeSourceInfo()->getType();
1826 for (unsigned i = 0; i != n; ++i) {
1827 OffsetOfExpr::OffsetOfNode ON = E->getComponent(i);
1828 llvm::Value *Offset = nullptr;
1829 switch (ON.getKind()) {
1830 case OffsetOfExpr::OffsetOfNode::Array: {
1831 // Compute the index
1832 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1833 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1834 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
1835 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1837 // Save the element type
1839 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1841 // Compute the element size
1842 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1843 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1845 // Multiply out to compute the result
1846 Offset = Builder.CreateMul(Idx, ElemSize);
1850 case OffsetOfExpr::OffsetOfNode::Field: {
1851 FieldDecl *MemberDecl = ON.getField();
1852 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1853 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1855 // Compute the index of the field in its parent.
1857 // FIXME: It would be nice if we didn't have to loop here!
1858 for (RecordDecl::field_iterator Field = RD->field_begin(),
1859 FieldEnd = RD->field_end();
1860 Field != FieldEnd; ++Field, ++i) {
1861 if (*Field == MemberDecl)
1864 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1866 // Compute the offset to the field
1867 int64_t OffsetInt = RL.getFieldOffset(i) /
1868 CGF.getContext().getCharWidth();
1869 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1871 // Save the element type.
1872 CurrentType = MemberDecl->getType();
1876 case OffsetOfExpr::OffsetOfNode::Identifier:
1877 llvm_unreachable("dependent __builtin_offsetof");
1879 case OffsetOfExpr::OffsetOfNode::Base: {
1880 if (ON.getBase()->isVirtual()) {
1881 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1885 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1886 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1888 // Save the element type.
1889 CurrentType = ON.getBase()->getType();
1891 // Compute the offset to the base.
1892 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1893 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
1894 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
1895 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
1899 Result = Builder.CreateAdd(Result, Offset);
1904 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
1905 /// argument of the sizeof expression as an integer.
1907 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
1908 const UnaryExprOrTypeTraitExpr *E) {
1909 QualType TypeToSize = E->getTypeOfArgument();
1910 if (E->getKind() == UETT_SizeOf) {
1911 if (const VariableArrayType *VAT =
1912 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
1913 if (E->isArgumentType()) {
1914 // sizeof(type) - make sure to emit the VLA size.
1915 CGF.EmitVariablyModifiedType(TypeToSize);
1917 // C99 6.5.3.4p2: If the argument is an expression of type
1918 // VLA, it is evaluated.
1919 CGF.EmitIgnoredExpr(E->getArgumentExpr());
1923 llvm::Value *numElts;
1924 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
1926 llvm::Value *size = numElts;
1928 // Scale the number of non-VLA elements by the non-VLA element size.
1929 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
1930 if (!eltSize.isOne())
1931 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
1937 // If this isn't sizeof(vla), the result must be constant; use the constant
1938 // folding logic so we don't have to duplicate it here.
1939 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
1942 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
1943 Expr *Op = E->getSubExpr();
1944 if (Op->getType()->isAnyComplexType()) {
1945 // If it's an l-value, load through the appropriate subobject l-value.
1946 // Note that we have to ask E because Op might be an l-value that
1947 // this won't work for, e.g. an Obj-C property.
1949 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
1950 E->getExprLoc()).getScalarVal();
1952 // Otherwise, calculate and project.
1953 return CGF.EmitComplexExpr(Op, false, true).first;
1959 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
1960 Expr *Op = E->getSubExpr();
1961 if (Op->getType()->isAnyComplexType()) {
1962 // If it's an l-value, load through the appropriate subobject l-value.
1963 // Note that we have to ask E because Op might be an l-value that
1964 // this won't work for, e.g. an Obj-C property.
1965 if (Op->isGLValue())
1966 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
1967 E->getExprLoc()).getScalarVal();
1969 // Otherwise, calculate and project.
1970 return CGF.EmitComplexExpr(Op, true, false).second;
1973 // __imag on a scalar returns zero. Emit the subexpr to ensure side
1974 // effects are evaluated, but not the actual value.
1975 if (Op->isGLValue())
1978 CGF.EmitScalarExpr(Op, true);
1979 return llvm::Constant::getNullValue(ConvertType(E->getType()));
1982 //===----------------------------------------------------------------------===//
1984 //===----------------------------------------------------------------------===//
1986 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
1987 TestAndClearIgnoreResultAssign();
1989 Result.LHS = Visit(E->getLHS());
1990 Result.RHS = Visit(E->getRHS());
1991 Result.Ty = E->getType();
1992 Result.Opcode = E->getOpcode();
1993 Result.FPContractable = E->isFPContractable();
1998 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
1999 const CompoundAssignOperator *E,
2000 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2002 QualType LHSTy = E->getLHS()->getType();
2005 if (E->getComputationResultType()->isAnyComplexType())
2006 return CGF.EmitScalarCompooundAssignWithComplex(E, Result);
2008 // Emit the RHS first. __block variables need to have the rhs evaluated
2009 // first, plus this should improve codegen a little.
2010 OpInfo.RHS = Visit(E->getRHS());
2011 OpInfo.Ty = E->getComputationResultType();
2012 OpInfo.Opcode = E->getOpcode();
2013 OpInfo.FPContractable = false;
2015 // Load/convert the LHS.
2016 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2018 llvm::PHINode *atomicPHI = nullptr;
2019 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2020 QualType type = atomicTy->getValueType();
2021 if (!type->isBooleanType() && type->isIntegerType() &&
2022 !(type->isUnsignedIntegerType() &&
2023 CGF.SanOpts->UnsignedIntegerOverflow) &&
2024 CGF.getLangOpts().getSignedOverflowBehavior() !=
2025 LangOptions::SOB_Trapping) {
2026 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2027 switch (OpInfo.Opcode) {
2028 // We don't have atomicrmw operands for *, %, /, <<, >>
2029 case BO_MulAssign: case BO_DivAssign:
2035 aop = llvm::AtomicRMWInst::Add;
2038 aop = llvm::AtomicRMWInst::Sub;
2041 aop = llvm::AtomicRMWInst::And;
2044 aop = llvm::AtomicRMWInst::Xor;
2047 aop = llvm::AtomicRMWInst::Or;
2050 llvm_unreachable("Invalid compound assignment type");
2052 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2053 llvm::Value *amt = CGF.EmitToMemory(EmitScalarConversion(OpInfo.RHS,
2054 E->getRHS()->getType(), LHSTy), LHSTy);
2055 Builder.CreateAtomicRMW(aop, LHSLV.getAddress(), amt,
2056 llvm::SequentiallyConsistent);
2060 // FIXME: For floating point types, we should be saving and restoring the
2061 // floating point environment in the loop.
2062 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2063 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2064 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2065 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2066 Builder.CreateBr(opBB);
2067 Builder.SetInsertPoint(opBB);
2068 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2069 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2070 OpInfo.LHS = atomicPHI;
2073 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2075 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
2076 E->getComputationLHSType());
2078 // Expand the binary operator.
2079 Result = (this->*Func)(OpInfo);
2081 // Convert the result back to the LHS type.
2082 Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy);
2085 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2086 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2087 llvm::Value *pair = Builder.CreateAtomicCmpXchg(
2088 LHSLV.getAddress(), atomicPHI, CGF.EmitToMemory(Result, LHSTy),
2089 llvm::SequentiallyConsistent, llvm::SequentiallyConsistent);
2090 llvm::Value *old = Builder.CreateExtractValue(pair, 0);
2091 llvm::Value *success = Builder.CreateExtractValue(pair, 1);
2092 atomicPHI->addIncoming(old, opBB);
2093 Builder.CreateCondBr(success, contBB, opBB);
2094 Builder.SetInsertPoint(contBB);
2098 // Store the result value into the LHS lvalue. Bit-fields are handled
2099 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2100 // 'An assignment expression has the value of the left operand after the
2102 if (LHSLV.isBitField())
2103 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2105 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2110 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2111 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2112 bool Ignore = TestAndClearIgnoreResultAssign();
2114 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2116 // If the result is clearly ignored, return now.
2120 // The result of an assignment in C is the assigned r-value.
2121 if (!CGF.getLangOpts().CPlusPlus)
2124 // If the lvalue is non-volatile, return the computed value of the assignment.
2125 if (!LHS.isVolatileQualified())
2128 // Otherwise, reload the value.
2129 return EmitLoadOfLValue(LHS, E->getExprLoc());
2132 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2133 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2134 llvm::Value *Cond = nullptr;
2136 if (CGF.SanOpts->IntegerDivideByZero)
2137 Cond = Builder.CreateICmpNE(Ops.RHS, Zero);
2139 if (CGF.SanOpts->SignedIntegerOverflow &&
2140 Ops.Ty->hasSignedIntegerRepresentation()) {
2141 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2143 llvm::Value *IntMin =
2144 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2145 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2147 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2148 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2149 llvm::Value *Overflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2150 Cond = Cond ? Builder.CreateAnd(Cond, Overflow, "and") : Overflow;
2154 EmitBinOpCheck(Cond, Ops);
2157 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2159 CodeGenFunction::SanitizerScope SanScope(&CGF);
2160 if ((CGF.SanOpts->IntegerDivideByZero ||
2161 CGF.SanOpts->SignedIntegerOverflow) &&
2162 Ops.Ty->isIntegerType()) {
2163 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2164 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2165 } else if (CGF.SanOpts->FloatDivideByZero &&
2166 Ops.Ty->isRealFloatingType()) {
2167 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2168 EmitBinOpCheck(Builder.CreateFCmpUNE(Ops.RHS, Zero), Ops);
2172 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2173 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2174 if (CGF.getLangOpts().OpenCL) {
2175 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
2176 llvm::Type *ValTy = Val->getType();
2177 if (ValTy->isFloatTy() ||
2178 (isa<llvm::VectorType>(ValTy) &&
2179 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2180 CGF.SetFPAccuracy(Val, 2.5);
2184 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2185 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2187 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2190 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2191 // Rem in C can't be a floating point type: C99 6.5.5p2.
2192 if (CGF.SanOpts->IntegerDivideByZero) {
2193 CodeGenFunction::SanitizerScope SanScope(&CGF);
2194 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2196 if (Ops.Ty->isIntegerType())
2197 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2200 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2201 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2203 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2206 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2210 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2211 switch (Ops.Opcode) {
2215 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2216 llvm::Intrinsic::uadd_with_overflow;
2221 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2222 llvm::Intrinsic::usub_with_overflow;
2227 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2228 llvm::Intrinsic::umul_with_overflow;
2231 llvm_unreachable("Unsupported operation for overflow detection");
2237 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2239 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2241 Value *resultAndOverflow = Builder.CreateCall2(intrinsic, Ops.LHS, Ops.RHS);
2242 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2243 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2245 // Handle overflow with llvm.trap if no custom handler has been specified.
2246 const std::string *handlerName =
2247 &CGF.getLangOpts().OverflowHandler;
2248 if (handlerName->empty()) {
2249 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2250 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2251 if (!isSigned || CGF.SanOpts->SignedIntegerOverflow) {
2252 CodeGenFunction::SanitizerScope SanScope(&CGF);
2253 EmitBinOpCheck(Builder.CreateNot(overflow), Ops);
2255 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2259 // Branch in case of overflow.
2260 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2261 llvm::Function::iterator insertPt = initialBB;
2262 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2263 std::next(insertPt));
2264 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2266 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2268 // If an overflow handler is set, then we want to call it and then use its
2269 // result, if it returns.
2270 Builder.SetInsertPoint(overflowBB);
2272 // Get the overflow handler.
2273 llvm::Type *Int8Ty = CGF.Int8Ty;
2274 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2275 llvm::FunctionType *handlerTy =
2276 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2277 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2279 // Sign extend the args to 64-bit, so that we can use the same handler for
2280 // all types of overflow.
2281 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2282 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2284 // Call the handler with the two arguments, the operation, and the size of
2286 llvm::Value *handlerArgs[] = {
2289 Builder.getInt8(OpID),
2290 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2292 llvm::Value *handlerResult =
2293 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2295 // Truncate the result back to the desired size.
2296 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2297 Builder.CreateBr(continueBB);
2299 Builder.SetInsertPoint(continueBB);
2300 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2301 phi->addIncoming(result, initialBB);
2302 phi->addIncoming(handlerResult, overflowBB);
2307 /// Emit pointer + index arithmetic.
2308 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2309 const BinOpInfo &op,
2310 bool isSubtraction) {
2311 // Must have binary (not unary) expr here. Unary pointer
2312 // increment/decrement doesn't use this path.
2313 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2315 Value *pointer = op.LHS;
2316 Expr *pointerOperand = expr->getLHS();
2317 Value *index = op.RHS;
2318 Expr *indexOperand = expr->getRHS();
2320 // In a subtraction, the LHS is always the pointer.
2321 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2322 std::swap(pointer, index);
2323 std::swap(pointerOperand, indexOperand);
2326 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2327 if (width != CGF.PointerWidthInBits) {
2328 // Zero-extend or sign-extend the pointer value according to
2329 // whether the index is signed or not.
2330 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2331 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2335 // If this is subtraction, negate the index.
2337 index = CGF.Builder.CreateNeg(index, "idx.neg");
2339 if (CGF.SanOpts->ArrayBounds)
2340 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2341 /*Accessed*/ false);
2343 const PointerType *pointerType
2344 = pointerOperand->getType()->getAs<PointerType>();
2346 QualType objectType = pointerOperand->getType()
2347 ->castAs<ObjCObjectPointerType>()
2349 llvm::Value *objectSize
2350 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2352 index = CGF.Builder.CreateMul(index, objectSize);
2354 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2355 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2356 return CGF.Builder.CreateBitCast(result, pointer->getType());
2359 QualType elementType = pointerType->getPointeeType();
2360 if (const VariableArrayType *vla
2361 = CGF.getContext().getAsVariableArrayType(elementType)) {
2362 // The element count here is the total number of non-VLA elements.
2363 llvm::Value *numElements = CGF.getVLASize(vla).first;
2365 // Effectively, the multiply by the VLA size is part of the GEP.
2366 // GEP indexes are signed, and scaling an index isn't permitted to
2367 // signed-overflow, so we use the same semantics for our explicit
2368 // multiply. We suppress this if overflow is not undefined behavior.
2369 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2370 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2371 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2373 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2374 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2379 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2380 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2382 if (elementType->isVoidType() || elementType->isFunctionType()) {
2383 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2384 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2385 return CGF.Builder.CreateBitCast(result, pointer->getType());
2388 if (CGF.getLangOpts().isSignedOverflowDefined())
2389 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2391 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2394 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2395 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2396 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2397 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2398 // efficient operations.
2399 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2400 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2401 bool negMul, bool negAdd) {
2402 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2404 Value *MulOp0 = MulOp->getOperand(0);
2405 Value *MulOp1 = MulOp->getOperand(1);
2409 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2411 } else if (negAdd) {
2414 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2419 Builder.CreateCall3(
2420 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2421 MulOp0, MulOp1, Addend);
2422 MulOp->eraseFromParent();
2427 // Check whether it would be legal to emit an fmuladd intrinsic call to
2428 // represent op and if so, build the fmuladd.
2430 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2431 // Does NOT check the type of the operation - it's assumed that this function
2432 // will be called from contexts where it's known that the type is contractable.
2433 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2434 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2437 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2438 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2439 "Only fadd/fsub can be the root of an fmuladd.");
2441 // Check whether this op is marked as fusable.
2442 if (!op.FPContractable)
2445 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2446 // either disabled, or handled entirely by the LLVM backend).
2447 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
2450 // We have a potentially fusable op. Look for a mul on one of the operands.
2451 if (llvm::BinaryOperator* LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2452 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul) {
2453 assert(LHSBinOp->getNumUses() == 0 &&
2454 "Operations with multiple uses shouldn't be contracted.");
2455 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2457 } else if (llvm::BinaryOperator* RHSBinOp =
2458 dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2459 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul) {
2460 assert(RHSBinOp->getNumUses() == 0 &&
2461 "Operations with multiple uses shouldn't be contracted.");
2462 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2469 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2470 if (op.LHS->getType()->isPointerTy() ||
2471 op.RHS->getType()->isPointerTy())
2472 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2474 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2475 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2476 case LangOptions::SOB_Defined:
2477 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2478 case LangOptions::SOB_Undefined:
2479 if (!CGF.SanOpts->SignedIntegerOverflow)
2480 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2482 case LangOptions::SOB_Trapping:
2483 return EmitOverflowCheckedBinOp(op);
2487 if (op.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
2488 return EmitOverflowCheckedBinOp(op);
2490 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2491 // Try to form an fmuladd.
2492 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2495 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
2498 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2501 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2502 // The LHS is always a pointer if either side is.
2503 if (!op.LHS->getType()->isPointerTy()) {
2504 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2505 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2506 case LangOptions::SOB_Defined:
2507 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2508 case LangOptions::SOB_Undefined:
2509 if (!CGF.SanOpts->SignedIntegerOverflow)
2510 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2512 case LangOptions::SOB_Trapping:
2513 return EmitOverflowCheckedBinOp(op);
2517 if (op.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
2518 return EmitOverflowCheckedBinOp(op);
2520 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2521 // Try to form an fmuladd.
2522 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2524 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
2527 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2530 // If the RHS is not a pointer, then we have normal pointer
2532 if (!op.RHS->getType()->isPointerTy())
2533 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2535 // Otherwise, this is a pointer subtraction.
2537 // Do the raw subtraction part.
2539 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2541 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2542 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2544 // Okay, figure out the element size.
2545 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2546 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2548 llvm::Value *divisor = nullptr;
2550 // For a variable-length array, this is going to be non-constant.
2551 if (const VariableArrayType *vla
2552 = CGF.getContext().getAsVariableArrayType(elementType)) {
2553 llvm::Value *numElements;
2554 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2556 divisor = numElements;
2558 // Scale the number of non-VLA elements by the non-VLA element size.
2559 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2560 if (!eltSize.isOne())
2561 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2563 // For everything elese, we can just compute it, safe in the
2564 // assumption that Sema won't let anything through that we can't
2565 // safely compute the size of.
2567 CharUnits elementSize;
2568 // Handle GCC extension for pointer arithmetic on void* and
2569 // function pointer types.
2570 if (elementType->isVoidType() || elementType->isFunctionType())
2571 elementSize = CharUnits::One();
2573 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2575 // Don't even emit the divide for element size of 1.
2576 if (elementSize.isOne())
2579 divisor = CGF.CGM.getSize(elementSize);
2582 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2583 // pointer difference in C is only defined in the case where both operands
2584 // are pointing to elements of an array.
2585 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2588 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2589 llvm::IntegerType *Ty;
2590 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2591 Ty = cast<llvm::IntegerType>(VT->getElementType());
2593 Ty = cast<llvm::IntegerType>(LHS->getType());
2594 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2597 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2598 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2599 // RHS to the same size as the LHS.
2600 Value *RHS = Ops.RHS;
2601 if (Ops.LHS->getType() != RHS->getType())
2602 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2604 if (CGF.SanOpts->Shift && !CGF.getLangOpts().OpenCL &&
2605 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2606 CodeGenFunction::SanitizerScope SanScope(&CGF);
2607 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
2608 llvm::Value *Valid = Builder.CreateICmpULE(RHS, WidthMinusOne);
2610 if (Ops.Ty->hasSignedIntegerRepresentation()) {
2611 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2612 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2613 llvm::BasicBlock *CheckBitsShifted = CGF.createBasicBlock("check");
2614 Builder.CreateCondBr(Valid, CheckBitsShifted, Cont);
2616 // Check whether we are shifting any non-zero bits off the top of the
2618 CGF.EmitBlock(CheckBitsShifted);
2619 llvm::Value *BitsShiftedOff =
2620 Builder.CreateLShr(Ops.LHS,
2621 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2622 /*NUW*/true, /*NSW*/true),
2624 if (CGF.getLangOpts().CPlusPlus) {
2625 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2626 // Under C++11's rules, shifting a 1 bit into the sign bit is
2627 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2628 // define signed left shifts, so we use the C99 and C++11 rules there).
2629 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2630 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2632 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2633 llvm::Value *SecondCheck = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2634 CGF.EmitBlock(Cont);
2635 llvm::PHINode *P = Builder.CreatePHI(Valid->getType(), 2);
2636 P->addIncoming(Valid, Orig);
2637 P->addIncoming(SecondCheck, CheckBitsShifted);
2641 EmitBinOpCheck(Valid, Ops);
2643 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2644 if (CGF.getLangOpts().OpenCL)
2645 RHS = Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2647 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2650 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2651 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2652 // RHS to the same size as the LHS.
2653 Value *RHS = Ops.RHS;
2654 if (Ops.LHS->getType() != RHS->getType())
2655 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2657 if (CGF.SanOpts->Shift && !CGF.getLangOpts().OpenCL &&
2658 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2659 CodeGenFunction::SanitizerScope SanScope(&CGF);
2660 EmitBinOpCheck(Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS)), Ops);
2663 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2664 if (CGF.getLangOpts().OpenCL)
2665 RHS = Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2667 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2668 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2669 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2672 enum IntrinsicType { VCMPEQ, VCMPGT };
2673 // return corresponding comparison intrinsic for given vector type
2674 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2675 BuiltinType::Kind ElemKind) {
2677 default: llvm_unreachable("unexpected element type");
2678 case BuiltinType::Char_U:
2679 case BuiltinType::UChar:
2680 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2681 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
2682 case BuiltinType::Char_S:
2683 case BuiltinType::SChar:
2684 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2685 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
2686 case BuiltinType::UShort:
2687 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2688 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
2689 case BuiltinType::Short:
2690 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2691 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
2692 case BuiltinType::UInt:
2693 case BuiltinType::ULong:
2694 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2695 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
2696 case BuiltinType::Int:
2697 case BuiltinType::Long:
2698 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2699 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
2700 case BuiltinType::Float:
2701 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2702 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
2706 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc,
2707 unsigned SICmpOpc, unsigned FCmpOpc) {
2708 TestAndClearIgnoreResultAssign();
2710 QualType LHSTy = E->getLHS()->getType();
2711 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
2712 assert(E->getOpcode() == BO_EQ ||
2713 E->getOpcode() == BO_NE);
2714 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2715 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
2716 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
2717 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
2718 } else if (!LHSTy->isAnyComplexType()) {
2719 Value *LHS = Visit(E->getLHS());
2720 Value *RHS = Visit(E->getRHS());
2722 // If AltiVec, the comparison results in a numeric type, so we use
2723 // intrinsics comparing vectors and giving 0 or 1 as a result
2724 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
2725 // constants for mapping CR6 register bits to predicate result
2726 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2728 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2730 // in several cases vector arguments order will be reversed
2731 Value *FirstVecArg = LHS,
2732 *SecondVecArg = RHS;
2734 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
2735 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
2736 BuiltinType::Kind ElementKind = BTy->getKind();
2738 switch(E->getOpcode()) {
2739 default: llvm_unreachable("is not a comparison operation");
2742 ID = GetIntrinsic(VCMPEQ, ElementKind);
2746 ID = GetIntrinsic(VCMPEQ, ElementKind);
2750 ID = GetIntrinsic(VCMPGT, ElementKind);
2751 std::swap(FirstVecArg, SecondVecArg);
2755 ID = GetIntrinsic(VCMPGT, ElementKind);
2758 if (ElementKind == BuiltinType::Float) {
2760 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2761 std::swap(FirstVecArg, SecondVecArg);
2765 ID = GetIntrinsic(VCMPGT, ElementKind);
2769 if (ElementKind == BuiltinType::Float) {
2771 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2775 ID = GetIntrinsic(VCMPGT, ElementKind);
2776 std::swap(FirstVecArg, SecondVecArg);
2781 Value *CR6Param = Builder.getInt32(CR6);
2782 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2783 Result = Builder.CreateCall3(F, CR6Param, FirstVecArg, SecondVecArg, "");
2784 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2787 if (LHS->getType()->isFPOrFPVectorTy()) {
2788 Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc,
2790 } else if (LHSTy->hasSignedIntegerRepresentation()) {
2791 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc,
2794 // Unsigned integers and pointers.
2795 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2799 // If this is a vector comparison, sign extend the result to the appropriate
2800 // vector integer type and return it (don't convert to bool).
2801 if (LHSTy->isVectorType())
2802 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2805 // Complex Comparison: can only be an equality comparison.
2806 CodeGenFunction::ComplexPairTy LHS = CGF.EmitComplexExpr(E->getLHS());
2807 CodeGenFunction::ComplexPairTy RHS = CGF.EmitComplexExpr(E->getRHS());
2809 QualType CETy = LHSTy->getAs<ComplexType>()->getElementType();
2811 Value *ResultR, *ResultI;
2812 if (CETy->isRealFloatingType()) {
2813 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2814 LHS.first, RHS.first, "cmp.r");
2815 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2816 LHS.second, RHS.second, "cmp.i");
2818 // Complex comparisons can only be equality comparisons. As such, signed
2819 // and unsigned opcodes are the same.
2820 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2821 LHS.first, RHS.first, "cmp.r");
2822 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2823 LHS.second, RHS.second, "cmp.i");
2826 if (E->getOpcode() == BO_EQ) {
2827 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2829 assert(E->getOpcode() == BO_NE &&
2830 "Complex comparison other than == or != ?");
2831 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2835 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2838 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
2839 bool Ignore = TestAndClearIgnoreResultAssign();
2844 switch (E->getLHS()->getType().getObjCLifetime()) {
2845 case Qualifiers::OCL_Strong:
2846 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
2849 case Qualifiers::OCL_Autoreleasing:
2850 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
2853 case Qualifiers::OCL_Weak:
2854 RHS = Visit(E->getRHS());
2855 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2856 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
2859 // No reason to do any of these differently.
2860 case Qualifiers::OCL_None:
2861 case Qualifiers::OCL_ExplicitNone:
2862 // __block variables need to have the rhs evaluated first, plus
2863 // this should improve codegen just a little.
2864 RHS = Visit(E->getRHS());
2865 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2867 // Store the value into the LHS. Bit-fields are handled specially
2868 // because the result is altered by the store, i.e., [C99 6.5.16p1]
2869 // 'An assignment expression has the value of the left operand after
2870 // the assignment...'.
2871 if (LHS.isBitField())
2872 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
2874 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
2877 // If the result is clearly ignored, return now.
2881 // The result of an assignment in C is the assigned r-value.
2882 if (!CGF.getLangOpts().CPlusPlus)
2885 // If the lvalue is non-volatile, return the computed value of the assignment.
2886 if (!LHS.isVolatileQualified())
2889 // Otherwise, reload the value.
2890 return EmitLoadOfLValue(LHS, E->getExprLoc());
2893 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
2894 RegionCounter Cnt = CGF.getPGORegionCounter(E);
2896 // Perform vector logical and on comparisons with zero vectors.
2897 if (E->getType()->isVectorType()) {
2898 Cnt.beginRegion(Builder);
2900 Value *LHS = Visit(E->getLHS());
2901 Value *RHS = Visit(E->getRHS());
2902 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
2903 if (LHS->getType()->isFPOrFPVectorTy()) {
2904 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
2905 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
2907 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
2908 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
2910 Value *And = Builder.CreateAnd(LHS, RHS);
2911 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
2914 llvm::Type *ResTy = ConvertType(E->getType());
2916 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
2917 // If we have 1 && X, just emit X without inserting the control flow.
2919 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
2920 if (LHSCondVal) { // If we have 1 && X, just emit X.
2921 Cnt.beginRegion(Builder);
2923 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
2924 // ZExt result to int or bool.
2925 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
2928 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
2929 if (!CGF.ContainsLabel(E->getRHS()))
2930 return llvm::Constant::getNullValue(ResTy);
2933 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
2934 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
2936 CodeGenFunction::ConditionalEvaluation eval(CGF);
2938 // Branch on the LHS first. If it is false, go to the failure (cont) block.
2939 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock, Cnt.getCount());
2941 // Any edges into the ContBlock are now from an (indeterminate number of)
2942 // edges from this first condition. All of these values will be false. Start
2943 // setting up the PHI node in the Cont Block for this.
2944 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
2946 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
2948 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
2951 CGF.EmitBlock(RHSBlock);
2952 Cnt.beginRegion(Builder);
2953 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
2956 // Reaquire the RHS block, as there may be subblocks inserted.
2957 RHSBlock = Builder.GetInsertBlock();
2959 // Emit an unconditional branch from this block to ContBlock.
2961 // There is no need to emit line number for unconditional branch.
2962 SuppressDebugLocation S(Builder);
2963 CGF.EmitBlock(ContBlock);
2965 // Insert an entry into the phi node for the edge with the value of RHSCond.
2966 PN->addIncoming(RHSCond, RHSBlock);
2968 // ZExt result to int.
2969 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
2972 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
2973 RegionCounter Cnt = CGF.getPGORegionCounter(E);
2975 // Perform vector logical or on comparisons with zero vectors.
2976 if (E->getType()->isVectorType()) {
2977 Cnt.beginRegion(Builder);
2979 Value *LHS = Visit(E->getLHS());
2980 Value *RHS = Visit(E->getRHS());
2981 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
2982 if (LHS->getType()->isFPOrFPVectorTy()) {
2983 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
2984 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
2986 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
2987 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
2989 Value *Or = Builder.CreateOr(LHS, RHS);
2990 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
2993 llvm::Type *ResTy = ConvertType(E->getType());
2995 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
2996 // If we have 0 || X, just emit X without inserting the control flow.
2998 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
2999 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3000 Cnt.beginRegion(Builder);
3002 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3003 // ZExt result to int or bool.
3004 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3007 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3008 if (!CGF.ContainsLabel(E->getRHS()))
3009 return llvm::ConstantInt::get(ResTy, 1);
3012 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3013 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3015 CodeGenFunction::ConditionalEvaluation eval(CGF);
3017 // Branch on the LHS first. If it is true, go to the success (cont) block.
3018 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3019 Cnt.getParentCount() - Cnt.getCount());
3021 // Any edges into the ContBlock are now from an (indeterminate number of)
3022 // edges from this first condition. All of these values will be true. Start
3023 // setting up the PHI node in the Cont Block for this.
3024 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3026 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3028 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3032 // Emit the RHS condition as a bool value.
3033 CGF.EmitBlock(RHSBlock);
3034 Cnt.beginRegion(Builder);
3035 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3039 // Reaquire the RHS block, as there may be subblocks inserted.
3040 RHSBlock = Builder.GetInsertBlock();
3042 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3043 // into the phi node for the edge with the value of RHSCond.
3044 CGF.EmitBlock(ContBlock);
3045 PN->addIncoming(RHSCond, RHSBlock);
3047 // ZExt result to int.
3048 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3051 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3052 CGF.EmitIgnoredExpr(E->getLHS());
3053 CGF.EnsureInsertPoint();
3054 return Visit(E->getRHS());
3057 //===----------------------------------------------------------------------===//
3059 //===----------------------------------------------------------------------===//
3061 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3062 /// expression is cheap enough and side-effect-free enough to evaluate
3063 /// unconditionally instead of conditionally. This is used to convert control
3064 /// flow into selects in some cases.
3065 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3066 CodeGenFunction &CGF) {
3067 // Anything that is an integer or floating point constant is fine.
3068 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3070 // Even non-volatile automatic variables can't be evaluated unconditionally.
3071 // Referencing a thread_local may cause non-trivial initialization work to
3072 // occur. If we're inside a lambda and one of the variables is from the scope
3073 // outside the lambda, that function may have returned already. Reading its
3074 // locals is a bad idea. Also, these reads may introduce races there didn't
3075 // exist in the source-level program.
3079 Value *ScalarExprEmitter::
3080 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3081 TestAndClearIgnoreResultAssign();
3083 // Bind the common expression if necessary.
3084 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3085 RegionCounter Cnt = CGF.getPGORegionCounter(E);
3087 Expr *condExpr = E->getCond();
3088 Expr *lhsExpr = E->getTrueExpr();
3089 Expr *rhsExpr = E->getFalseExpr();
3091 // If the condition constant folds and can be elided, try to avoid emitting
3092 // the condition and the dead arm.
3094 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3095 Expr *live = lhsExpr, *dead = rhsExpr;
3096 if (!CondExprBool) std::swap(live, dead);
3098 // If the dead side doesn't have labels we need, just emit the Live part.
3099 if (!CGF.ContainsLabel(dead)) {
3101 Cnt.beginRegion(Builder);
3102 Value *Result = Visit(live);
3104 // If the live part is a throw expression, it acts like it has a void
3105 // type, so evaluating it returns a null Value*. However, a conditional
3106 // with non-void type must return a non-null Value*.
3107 if (!Result && !E->getType()->isVoidType())
3108 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3114 // OpenCL: If the condition is a vector, we can treat this condition like
3115 // the select function.
3116 if (CGF.getLangOpts().OpenCL
3117 && condExpr->getType()->isVectorType()) {
3118 Cnt.beginRegion(Builder);
3120 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3121 llvm::Value *LHS = Visit(lhsExpr);
3122 llvm::Value *RHS = Visit(rhsExpr);
3124 llvm::Type *condType = ConvertType(condExpr->getType());
3125 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3127 unsigned numElem = vecTy->getNumElements();
3128 llvm::Type *elemType = vecTy->getElementType();
3130 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3131 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3132 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3133 llvm::VectorType::get(elemType,
3136 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3138 // Cast float to int to perform ANDs if necessary.
3139 llvm::Value *RHSTmp = RHS;
3140 llvm::Value *LHSTmp = LHS;
3141 bool wasCast = false;
3142 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3143 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3144 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3145 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3149 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3150 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3151 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3153 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3158 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3159 // select instead of as control flow. We can only do this if it is cheap and
3160 // safe to evaluate the LHS and RHS unconditionally.
3161 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3162 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3163 Cnt.beginRegion(Builder);
3165 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3166 llvm::Value *LHS = Visit(lhsExpr);
3167 llvm::Value *RHS = Visit(rhsExpr);
3169 // If the conditional has void type, make sure we return a null Value*.
3170 assert(!RHS && "LHS and RHS types must match");
3173 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3176 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3177 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3178 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3180 CodeGenFunction::ConditionalEvaluation eval(CGF);
3181 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock, Cnt.getCount());
3183 CGF.EmitBlock(LHSBlock);
3184 Cnt.beginRegion(Builder);
3186 Value *LHS = Visit(lhsExpr);
3189 LHSBlock = Builder.GetInsertBlock();
3190 Builder.CreateBr(ContBlock);
3192 CGF.EmitBlock(RHSBlock);
3194 Value *RHS = Visit(rhsExpr);
3197 RHSBlock = Builder.GetInsertBlock();
3198 CGF.EmitBlock(ContBlock);
3200 // If the LHS or RHS is a throw expression, it will be legitimately null.
3206 // Create a PHI node for the real part.
3207 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3208 PN->addIncoming(LHS, LHSBlock);
3209 PN->addIncoming(RHS, RHSBlock);
3213 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3214 return Visit(E->getChosenSubExpr());
3217 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3218 QualType Ty = VE->getType();
3220 if (Ty->isVariablyModifiedType())
3221 CGF.EmitVariablyModifiedType(Ty);
3223 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
3224 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
3225 llvm::Type *ArgTy = ConvertType(VE->getType());
3227 // If EmitVAArg fails, we fall back to the LLVM instruction.
3229 return Builder.CreateVAArg(ArgValue, ArgTy);
3231 // FIXME Volatility.
3232 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3234 // If EmitVAArg promoted the type, we must truncate it.
3235 if (ArgTy != Val->getType())
3236 Val = Builder.CreateTrunc(Val, ArgTy);
3241 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3242 return CGF.EmitBlockLiteral(block);
3245 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3246 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3247 llvm::Type *DstTy = ConvertType(E->getType());
3249 // Going from vec4->vec3 or vec3->vec4 is a special case and requires
3250 // a shuffle vector instead of a bitcast.
3251 llvm::Type *SrcTy = Src->getType();
3252 if (isa<llvm::VectorType>(DstTy) && isa<llvm::VectorType>(SrcTy)) {
3253 unsigned numElementsDst = cast<llvm::VectorType>(DstTy)->getNumElements();
3254 unsigned numElementsSrc = cast<llvm::VectorType>(SrcTy)->getNumElements();
3255 if ((numElementsDst == 3 && numElementsSrc == 4)
3256 || (numElementsDst == 4 && numElementsSrc == 3)) {
3259 // In the case of going from int4->float3, a bitcast is needed before
3261 llvm::Type *srcElemTy =
3262 cast<llvm::VectorType>(SrcTy)->getElementType();
3263 llvm::Type *dstElemTy =
3264 cast<llvm::VectorType>(DstTy)->getElementType();
3266 if ((srcElemTy->isIntegerTy() && dstElemTy->isFloatTy())
3267 || (srcElemTy->isFloatTy() && dstElemTy->isIntegerTy())) {
3268 // Create a float type of the same size as the source or destination.
3269 llvm::VectorType *newSrcTy = llvm::VectorType::get(dstElemTy,
3272 Src = Builder.CreateBitCast(Src, newSrcTy, "astypeCast");
3275 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3277 SmallVector<llvm::Constant*, 3> Args;
3278 Args.push_back(Builder.getInt32(0));
3279 Args.push_back(Builder.getInt32(1));
3280 Args.push_back(Builder.getInt32(2));
3282 if (numElementsDst == 4)
3283 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3285 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3287 return Builder.CreateShuffleVector(Src, UnV, Mask, "astype");
3291 return Builder.CreateBitCast(Src, DstTy, "astype");
3294 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3295 return CGF.EmitAtomicExpr(E).getScalarVal();
3298 //===----------------------------------------------------------------------===//
3299 // Entry Point into this File
3300 //===----------------------------------------------------------------------===//
3302 /// EmitScalarExpr - Emit the computation of the specified expression of scalar
3303 /// type, ignoring the result.
3304 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3305 assert(E && hasScalarEvaluationKind(E->getType()) &&
3306 "Invalid scalar expression to emit");
3308 if (isa<CXXDefaultArgExpr>(E))
3310 Value *V = ScalarExprEmitter(*this, IgnoreResultAssign)
3311 .Visit(const_cast<Expr*>(E));
3312 if (isa<CXXDefaultArgExpr>(E))
3317 /// EmitScalarConversion - Emit a conversion from the specified type to the
3318 /// specified destination type, both of which are LLVM scalar types.
3319 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3321 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3322 "Invalid scalar expression to emit");
3323 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy);
3326 /// EmitComplexToScalarConversion - Emit a conversion from the specified complex
3327 /// type to the specified destination type, where the destination type is an
3328 /// LLVM scalar type.
3329 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3332 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3333 "Invalid complex -> scalar conversion");
3334 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy,
3339 llvm::Value *CodeGenFunction::
3340 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3341 bool isInc, bool isPre) {
3342 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3345 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3347 // object->isa or (*object).isa
3348 // Generate code as for: *(Class*)object
3349 // build Class* type
3350 llvm::Type *ClassPtrTy = ConvertType(E->getType());
3352 Expr *BaseExpr = E->getBase();
3353 if (BaseExpr->isRValue()) {
3354 V = CreateMemTemp(E->getType(), "resval");
3355 llvm::Value *Src = EmitScalarExpr(BaseExpr);
3356 Builder.CreateStore(Src, V);
3357 V = ScalarExprEmitter(*this).EmitLoadOfLValue(
3358 MakeNaturalAlignAddrLValue(V, E->getType()), E->getExprLoc());
3361 V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr);
3363 V = EmitLValue(BaseExpr).getAddress();
3366 // build Class* type
3367 ClassPtrTy = ClassPtrTy->getPointerTo();
3368 V = Builder.CreateBitCast(V, ClassPtrTy);
3369 return MakeNaturalAlignAddrLValue(V, E->getType());
3373 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3374 const CompoundAssignOperator *E) {
3375 ScalarExprEmitter Scalar(*this);
3376 Value *Result = nullptr;
3377 switch (E->getOpcode()) {
3378 #define COMPOUND_OP(Op) \
3379 case BO_##Op##Assign: \
3380 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3416 llvm_unreachable("Not valid compound assignment operators");
3419 llvm_unreachable("Unhandled compound assignment operator");