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 "TargetInfo.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "clang/AST/StmtVisitor.h"
24 #include "clang/Basic/TargetInfo.h"
25 #include "clang/Frontend/CodeGenOptions.h"
26 #include "llvm/IR/CFG.h"
27 #include "llvm/IR/Constants.h"
28 #include "llvm/IR/DataLayout.h"
29 #include "llvm/IR/Function.h"
30 #include "llvm/IR/GlobalVariable.h"
31 #include "llvm/IR/Intrinsics.h"
32 #include "llvm/IR/Module.h"
35 using namespace clang;
36 using namespace CodeGen;
39 //===----------------------------------------------------------------------===//
40 // Scalar Expression Emitter
41 //===----------------------------------------------------------------------===//
47 QualType Ty; // Computation Type.
48 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
50 const Expr *E; // Entire expr, for error unsupported. May not be binop.
53 static bool MustVisitNullValue(const Expr *E) {
54 // If a null pointer expression's type is the C++0x nullptr_t, then
55 // it's not necessarily a simple constant and it must be evaluated
56 // for its potential side effects.
57 return E->getType()->isNullPtrType();
60 class ScalarExprEmitter
61 : public StmtVisitor<ScalarExprEmitter, Value*> {
64 bool IgnoreResultAssign;
65 llvm::LLVMContext &VMContext;
68 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
69 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
70 VMContext(cgf.getLLVMContext()) {
73 //===--------------------------------------------------------------------===//
75 //===--------------------------------------------------------------------===//
77 bool TestAndClearIgnoreResultAssign() {
78 bool I = IgnoreResultAssign;
79 IgnoreResultAssign = false;
83 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
84 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
85 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
86 return CGF.EmitCheckedLValue(E, TCK);
89 void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks,
90 const BinOpInfo &Info);
92 Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
93 return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
96 void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
97 const AlignValueAttr *AVAttr = nullptr;
98 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
99 const ValueDecl *VD = DRE->getDecl();
101 if (VD->getType()->isReferenceType()) {
102 if (const auto *TTy =
103 dyn_cast<TypedefType>(VD->getType().getNonReferenceType()))
104 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
106 // Assumptions for function parameters are emitted at the start of the
107 // function, so there is no need to repeat that here.
108 if (isa<ParmVarDecl>(VD))
111 AVAttr = VD->getAttr<AlignValueAttr>();
116 if (const auto *TTy =
117 dyn_cast<TypedefType>(E->getType()))
118 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
123 Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
124 llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
125 CGF.EmitAlignmentAssumption(V, AlignmentCI->getZExtValue());
128 /// EmitLoadOfLValue - Given an expression with complex type that represents a
129 /// value l-value, this method emits the address of the l-value, then loads
130 /// and returns the result.
131 Value *EmitLoadOfLValue(const Expr *E) {
132 Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
135 EmitLValueAlignmentAssumption(E, V);
139 /// EmitConversionToBool - Convert the specified expression value to a
140 /// boolean (i1) truth value. This is equivalent to "Val != 0".
141 Value *EmitConversionToBool(Value *Src, QualType DstTy);
143 /// \brief Emit a check that a conversion to or from a floating-point type
144 /// does not overflow.
145 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
146 Value *Src, QualType SrcType,
147 QualType DstType, llvm::Type *DstTy);
149 /// EmitScalarConversion - Emit a conversion from the specified type to the
150 /// specified destination type, both of which are LLVM scalar types.
151 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy);
153 /// EmitComplexToScalarConversion - Emit a conversion from the specified
154 /// complex type to the specified destination type, where the destination type
155 /// is an LLVM scalar type.
156 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
157 QualType SrcTy, QualType DstTy);
159 /// EmitNullValue - Emit a value that corresponds to null for the given type.
160 Value *EmitNullValue(QualType Ty);
162 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
163 Value *EmitFloatToBoolConversion(Value *V) {
164 // Compare against 0.0 for fp scalars.
165 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
166 return Builder.CreateFCmpUNE(V, Zero, "tobool");
169 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
170 Value *EmitPointerToBoolConversion(Value *V) {
171 Value *Zero = llvm::ConstantPointerNull::get(
172 cast<llvm::PointerType>(V->getType()));
173 return Builder.CreateICmpNE(V, Zero, "tobool");
176 Value *EmitIntToBoolConversion(Value *V) {
177 // Because of the type rules of C, we often end up computing a
178 // logical value, then zero extending it to int, then wanting it
179 // as a logical value again. Optimize this common case.
180 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
181 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
182 Value *Result = ZI->getOperand(0);
183 // If there aren't any more uses, zap the instruction to save space.
184 // Note that there can be more uses, for example if this
185 // is the result of an assignment.
187 ZI->eraseFromParent();
192 return Builder.CreateIsNotNull(V, "tobool");
195 //===--------------------------------------------------------------------===//
197 //===--------------------------------------------------------------------===//
199 Value *Visit(Expr *E) {
200 ApplyDebugLocation DL(CGF, E);
201 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
204 Value *VisitStmt(Stmt *S) {
205 S->dump(CGF.getContext().getSourceManager());
206 llvm_unreachable("Stmt can't have complex result type!");
208 Value *VisitExpr(Expr *S);
210 Value *VisitParenExpr(ParenExpr *PE) {
211 return Visit(PE->getSubExpr());
213 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
214 return Visit(E->getReplacement());
216 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
217 return Visit(GE->getResultExpr());
221 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
222 return Builder.getInt(E->getValue());
224 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
225 return llvm::ConstantFP::get(VMContext, E->getValue());
227 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
228 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
230 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
231 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
233 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
234 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
236 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
237 return EmitNullValue(E->getType());
239 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
240 return EmitNullValue(E->getType());
242 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
243 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
244 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
245 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
246 return Builder.CreateBitCast(V, ConvertType(E->getType()));
249 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
250 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
253 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
254 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
257 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
259 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E), E->getExprLoc());
261 // Otherwise, assume the mapping is the scalar directly.
262 return CGF.getOpaqueRValueMapping(E).getScalarVal();
266 Value *VisitDeclRefExpr(DeclRefExpr *E) {
267 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
268 if (result.isReference())
269 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E),
271 return result.getValue();
273 return EmitLoadOfLValue(E);
276 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
277 return CGF.EmitObjCSelectorExpr(E);
279 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
280 return CGF.EmitObjCProtocolExpr(E);
282 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
283 return EmitLoadOfLValue(E);
285 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
286 if (E->getMethodDecl() &&
287 E->getMethodDecl()->getReturnType()->isReferenceType())
288 return EmitLoadOfLValue(E);
289 return CGF.EmitObjCMessageExpr(E).getScalarVal();
292 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
293 LValue LV = CGF.EmitObjCIsaExpr(E);
294 Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
298 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
299 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
300 Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
301 Value *VisitMemberExpr(MemberExpr *E);
302 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
303 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
304 return EmitLoadOfLValue(E);
307 Value *VisitInitListExpr(InitListExpr *E);
309 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
310 return EmitNullValue(E->getType());
312 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
313 if (E->getType()->isVariablyModifiedType())
314 CGF.EmitVariablyModifiedType(E->getType());
316 if (CGDebugInfo *DI = CGF.getDebugInfo())
317 DI->EmitExplicitCastType(E->getType());
319 return VisitCastExpr(E);
321 Value *VisitCastExpr(CastExpr *E);
323 Value *VisitCallExpr(const CallExpr *E) {
324 if (E->getCallReturnType(CGF.getContext())->isReferenceType())
325 return EmitLoadOfLValue(E);
327 Value *V = CGF.EmitCallExpr(E).getScalarVal();
329 EmitLValueAlignmentAssumption(E, V);
333 Value *VisitStmtExpr(const StmtExpr *E);
336 Value *VisitUnaryPostDec(const UnaryOperator *E) {
337 LValue LV = EmitLValue(E->getSubExpr());
338 return EmitScalarPrePostIncDec(E, LV, false, false);
340 Value *VisitUnaryPostInc(const UnaryOperator *E) {
341 LValue LV = EmitLValue(E->getSubExpr());
342 return EmitScalarPrePostIncDec(E, LV, true, false);
344 Value *VisitUnaryPreDec(const UnaryOperator *E) {
345 LValue LV = EmitLValue(E->getSubExpr());
346 return EmitScalarPrePostIncDec(E, LV, false, true);
348 Value *VisitUnaryPreInc(const UnaryOperator *E) {
349 LValue LV = EmitLValue(E->getSubExpr());
350 return EmitScalarPrePostIncDec(E, LV, true, true);
353 llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E,
357 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
358 bool isInc, bool isPre);
361 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
362 if (isa<MemberPointerType>(E->getType())) // never sugared
363 return CGF.CGM.getMemberPointerConstant(E);
365 return EmitLValue(E->getSubExpr()).getAddress();
367 Value *VisitUnaryDeref(const UnaryOperator *E) {
368 if (E->getType()->isVoidType())
369 return Visit(E->getSubExpr()); // the actual value should be unused
370 return EmitLoadOfLValue(E);
372 Value *VisitUnaryPlus(const UnaryOperator *E) {
373 // This differs from gcc, though, most likely due to a bug in gcc.
374 TestAndClearIgnoreResultAssign();
375 return Visit(E->getSubExpr());
377 Value *VisitUnaryMinus (const UnaryOperator *E);
378 Value *VisitUnaryNot (const UnaryOperator *E);
379 Value *VisitUnaryLNot (const UnaryOperator *E);
380 Value *VisitUnaryReal (const UnaryOperator *E);
381 Value *VisitUnaryImag (const UnaryOperator *E);
382 Value *VisitUnaryExtension(const UnaryOperator *E) {
383 return Visit(E->getSubExpr());
387 Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
388 return EmitLoadOfLValue(E);
391 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
392 return Visit(DAE->getExpr());
394 Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
395 CodeGenFunction::CXXDefaultInitExprScope Scope(CGF);
396 return Visit(DIE->getExpr());
398 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
399 return CGF.LoadCXXThis();
402 Value *VisitExprWithCleanups(ExprWithCleanups *E) {
403 CGF.enterFullExpression(E);
404 CodeGenFunction::RunCleanupsScope Scope(CGF);
405 return Visit(E->getSubExpr());
407 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
408 return CGF.EmitCXXNewExpr(E);
410 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
411 CGF.EmitCXXDeleteExpr(E);
415 Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
416 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
419 Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
420 return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue());
423 Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
424 return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
427 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
428 // C++ [expr.pseudo]p1:
429 // The result shall only be used as the operand for the function call
430 // operator (), and the result of such a call has type void. The only
431 // effect is the evaluation of the postfix-expression before the dot or
433 CGF.EmitScalarExpr(E->getBase());
437 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
438 return EmitNullValue(E->getType());
441 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
442 CGF.EmitCXXThrowExpr(E);
446 Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
447 return Builder.getInt1(E->getValue());
451 Value *EmitMul(const BinOpInfo &Ops) {
452 if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
453 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
454 case LangOptions::SOB_Defined:
455 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
456 case LangOptions::SOB_Undefined:
457 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
458 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
460 case LangOptions::SOB_Trapping:
461 return EmitOverflowCheckedBinOp(Ops);
465 if (Ops.Ty->isUnsignedIntegerType() &&
466 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
467 return EmitOverflowCheckedBinOp(Ops);
469 if (Ops.LHS->getType()->isFPOrFPVectorTy())
470 return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
471 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
473 /// Create a binary op that checks for overflow.
474 /// Currently only supports +, - and *.
475 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
477 // Check for undefined division and modulus behaviors.
478 void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
479 llvm::Value *Zero,bool isDiv);
480 // Common helper for getting how wide LHS of shift is.
481 static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS);
482 Value *EmitDiv(const BinOpInfo &Ops);
483 Value *EmitRem(const BinOpInfo &Ops);
484 Value *EmitAdd(const BinOpInfo &Ops);
485 Value *EmitSub(const BinOpInfo &Ops);
486 Value *EmitShl(const BinOpInfo &Ops);
487 Value *EmitShr(const BinOpInfo &Ops);
488 Value *EmitAnd(const BinOpInfo &Ops) {
489 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
491 Value *EmitXor(const BinOpInfo &Ops) {
492 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
494 Value *EmitOr (const BinOpInfo &Ops) {
495 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
498 BinOpInfo EmitBinOps(const BinaryOperator *E);
499 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
500 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
503 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
504 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
506 // Binary operators and binary compound assignment operators.
507 #define HANDLEBINOP(OP) \
508 Value *VisitBin ## OP(const BinaryOperator *E) { \
509 return Emit ## OP(EmitBinOps(E)); \
511 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
512 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
527 Value *EmitCompare(const BinaryOperator *E, unsigned UICmpOpc,
528 unsigned SICmpOpc, unsigned FCmpOpc);
529 #define VISITCOMP(CODE, UI, SI, FP) \
530 Value *VisitBin##CODE(const BinaryOperator *E) { \
531 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
532 llvm::FCmpInst::FP); }
533 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
534 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
535 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
536 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
537 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
538 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
541 Value *VisitBinAssign (const BinaryOperator *E);
543 Value *VisitBinLAnd (const BinaryOperator *E);
544 Value *VisitBinLOr (const BinaryOperator *E);
545 Value *VisitBinComma (const BinaryOperator *E);
547 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
548 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
551 Value *VisitBlockExpr(const BlockExpr *BE);
552 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
553 Value *VisitChooseExpr(ChooseExpr *CE);
554 Value *VisitVAArgExpr(VAArgExpr *VE);
555 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
556 return CGF.EmitObjCStringLiteral(E);
558 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
559 return CGF.EmitObjCBoxedExpr(E);
561 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
562 return CGF.EmitObjCArrayLiteral(E);
564 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
565 return CGF.EmitObjCDictionaryLiteral(E);
567 Value *VisitAsTypeExpr(AsTypeExpr *CE);
568 Value *VisitAtomicExpr(AtomicExpr *AE);
570 } // end anonymous namespace.
572 //===----------------------------------------------------------------------===//
574 //===----------------------------------------------------------------------===//
576 /// EmitConversionToBool - Convert the specified expression value to a
577 /// boolean (i1) truth value. This is equivalent to "Val != 0".
578 Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
579 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
581 if (SrcType->isRealFloatingType())
582 return EmitFloatToBoolConversion(Src);
584 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
585 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
587 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
588 "Unknown scalar type to convert");
590 if (isa<llvm::IntegerType>(Src->getType()))
591 return EmitIntToBoolConversion(Src);
593 assert(isa<llvm::PointerType>(Src->getType()));
594 return EmitPointerToBoolConversion(Src);
597 void ScalarExprEmitter::EmitFloatConversionCheck(Value *OrigSrc,
598 QualType OrigSrcType,
599 Value *Src, QualType SrcType,
602 CodeGenFunction::SanitizerScope SanScope(&CGF);
606 llvm::Type *SrcTy = Src->getType();
608 llvm::Value *Check = nullptr;
609 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
610 // Integer to floating-point. This can fail for unsigned short -> __half
611 // or unsigned __int128 -> float.
612 assert(DstType->isFloatingType());
613 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
615 APFloat LargestFloat =
616 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
617 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
620 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
621 &IsExact) != APFloat::opOK)
622 // The range of representable values of this floating point type includes
623 // all values of this integer type. Don't need an overflow check.
626 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
628 Check = Builder.CreateICmpULE(Src, Max);
630 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
631 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
632 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
633 Check = Builder.CreateAnd(GE, LE);
636 const llvm::fltSemantics &SrcSema =
637 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
638 if (isa<llvm::IntegerType>(DstTy)) {
639 // Floating-point to integer. This has undefined behavior if the source is
640 // +-Inf, NaN, or doesn't fit into the destination type (after truncation
642 unsigned Width = CGF.getContext().getIntWidth(DstType);
643 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
645 APSInt Min = APSInt::getMinValue(Width, Unsigned);
646 APFloat MinSrc(SrcSema, APFloat::uninitialized);
647 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
649 // Don't need an overflow check for lower bound. Just check for
651 MinSrc = APFloat::getInf(SrcSema, true);
653 // Find the largest value which is too small to represent (before
654 // truncation toward zero).
655 MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
657 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
658 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
659 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
661 // Don't need an overflow check for upper bound. Just check for
663 MaxSrc = APFloat::getInf(SrcSema, false);
665 // Find the smallest value which is too large to represent (before
666 // truncation toward zero).
667 MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
669 // If we're converting from __half, convert the range to float to match
671 if (OrigSrcType->isHalfType()) {
672 const llvm::fltSemantics &Sema =
673 CGF.getContext().getFloatTypeSemantics(SrcType);
675 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
676 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
680 Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
682 Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
683 Check = Builder.CreateAnd(GE, LE);
685 // FIXME: Maybe split this sanitizer out from float-cast-overflow.
687 // Floating-point to floating-point. This has undefined behavior if the
688 // source is not in the range of representable values of the destination
689 // type. The C and C++ standards are spectacularly unclear here. We
690 // diagnose finite out-of-range conversions, but allow infinities and NaNs
691 // to convert to the corresponding value in the smaller type.
693 // C11 Annex F gives all such conversions defined behavior for IEC 60559
694 // conforming implementations. Unfortunately, LLVM's fptrunc instruction
697 // Converting from a lower rank to a higher rank can never have
698 // undefined behavior, since higher-rank types must have a superset
699 // of values of lower-rank types.
700 if (CGF.getContext().getFloatingTypeOrder(OrigSrcType, DstType) != 1)
703 assert(!OrigSrcType->isHalfType() &&
704 "should not check conversion from __half, it has the lowest rank");
706 const llvm::fltSemantics &DstSema =
707 CGF.getContext().getFloatTypeSemantics(DstType);
708 APFloat MinBad = APFloat::getLargest(DstSema, false);
709 APFloat MaxBad = APFloat::getInf(DstSema, false);
712 MinBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
713 MaxBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
715 Value *AbsSrc = CGF.EmitNounwindRuntimeCall(
716 CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Src->getType()), Src);
718 Builder.CreateFCmpOGT(AbsSrc, llvm::ConstantFP::get(VMContext, MinBad));
720 Builder.CreateFCmpOLT(AbsSrc, llvm::ConstantFP::get(VMContext, MaxBad));
721 Check = Builder.CreateNot(Builder.CreateAnd(GE, LE));
725 // FIXME: Provide a SourceLocation.
726 llvm::Constant *StaticArgs[] = {
727 CGF.EmitCheckTypeDescriptor(OrigSrcType),
728 CGF.EmitCheckTypeDescriptor(DstType)
730 CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow),
731 "float_cast_overflow", StaticArgs, OrigSrc);
734 /// EmitScalarConversion - Emit a conversion from the specified type to the
735 /// specified destination type, both of which are LLVM scalar types.
736 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
738 SrcType = CGF.getContext().getCanonicalType(SrcType);
739 DstType = CGF.getContext().getCanonicalType(DstType);
740 if (SrcType == DstType) return Src;
742 if (DstType->isVoidType()) return nullptr;
744 llvm::Value *OrigSrc = Src;
745 QualType OrigSrcType = SrcType;
746 llvm::Type *SrcTy = Src->getType();
748 // Handle conversions to bool first, they are special: comparisons against 0.
749 if (DstType->isBooleanType())
750 return EmitConversionToBool(Src, SrcType);
752 llvm::Type *DstTy = ConvertType(DstType);
754 // Cast from half through float if half isn't a native type.
755 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
756 // Cast to FP using the intrinsic if the half type itself isn't supported.
757 if (DstTy->isFloatingPointTy()) {
758 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
759 return Builder.CreateCall(
760 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy),
763 // Cast to other types through float, using either the intrinsic or FPExt,
764 // depending on whether the half type itself is supported
765 // (as opposed to operations on half, available with NativeHalfType).
766 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
767 Src = Builder.CreateCall(
768 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
772 Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv");
774 SrcType = CGF.getContext().FloatTy;
779 // Ignore conversions like int -> uint.
783 // Handle pointer conversions next: pointers can only be converted to/from
784 // other pointers and integers. Check for pointer types in terms of LLVM, as
785 // some native types (like Obj-C id) may map to a pointer type.
786 if (isa<llvm::PointerType>(DstTy)) {
787 // The source value may be an integer, or a pointer.
788 if (isa<llvm::PointerType>(SrcTy))
789 return Builder.CreateBitCast(Src, DstTy, "conv");
791 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
792 // First, convert to the correct width so that we control the kind of
794 llvm::Type *MiddleTy = CGF.IntPtrTy;
795 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
796 llvm::Value* IntResult =
797 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
798 // Then, cast to pointer.
799 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
802 if (isa<llvm::PointerType>(SrcTy)) {
803 // Must be an ptr to int cast.
804 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
805 return Builder.CreatePtrToInt(Src, DstTy, "conv");
808 // A scalar can be splatted to an extended vector of the same element type
809 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
810 // Cast the scalar to element type
811 QualType EltTy = DstType->getAs<ExtVectorType>()->getElementType();
812 llvm::Value *Elt = EmitScalarConversion(Src, SrcType, EltTy);
814 // Splat the element across to all elements
815 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
816 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
819 // Allow bitcast from vector to integer/fp of the same size.
820 if (isa<llvm::VectorType>(SrcTy) ||
821 isa<llvm::VectorType>(DstTy))
822 return Builder.CreateBitCast(Src, DstTy, "conv");
824 // Finally, we have the arithmetic types: real int/float.
825 Value *Res = nullptr;
826 llvm::Type *ResTy = DstTy;
828 // An overflowing conversion has undefined behavior if either the source type
829 // or the destination type is a floating-point type.
830 if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) &&
831 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
832 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType,
835 // Cast to half through float if half isn't a native type.
836 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
837 // Make sure we cast in a single step if from another FP type.
838 if (SrcTy->isFloatingPointTy()) {
839 // Use the intrinsic if the half type itself isn't supported
840 // (as opposed to operations on half, available with NativeHalfType).
841 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
842 return Builder.CreateCall(
843 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src);
844 // If the half type is supported, just use an fptrunc.
845 return Builder.CreateFPTrunc(Src, DstTy);
850 if (isa<llvm::IntegerType>(SrcTy)) {
851 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
852 if (isa<llvm::IntegerType>(DstTy))
853 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
854 else if (InputSigned)
855 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
857 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
858 } else if (isa<llvm::IntegerType>(DstTy)) {
859 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
860 if (DstType->isSignedIntegerOrEnumerationType())
861 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
863 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
865 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
866 "Unknown real conversion");
867 if (DstTy->getTypeID() < SrcTy->getTypeID())
868 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
870 Res = Builder.CreateFPExt(Src, DstTy, "conv");
873 if (DstTy != ResTy) {
874 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
875 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
876 Res = Builder.CreateCall(
877 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy),
880 Res = Builder.CreateFPTrunc(Res, ResTy, "conv");
887 /// EmitComplexToScalarConversion - Emit a conversion from the specified complex
888 /// type to the specified destination type, where the destination type is an
889 /// LLVM scalar type.
890 Value *ScalarExprEmitter::
891 EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
892 QualType SrcTy, QualType DstTy) {
893 // Get the source element type.
894 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
896 // Handle conversions to bool first, they are special: comparisons against 0.
897 if (DstTy->isBooleanType()) {
898 // Complex != 0 -> (Real != 0) | (Imag != 0)
899 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy);
900 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy);
901 return Builder.CreateOr(Src.first, Src.second, "tobool");
904 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
905 // the imaginary part of the complex value is discarded and the value of the
906 // real part is converted according to the conversion rules for the
907 // corresponding real type.
908 return EmitScalarConversion(Src.first, SrcTy, DstTy);
911 Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
912 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
915 /// \brief Emit a sanitization check for the given "binary" operation (which
916 /// might actually be a unary increment which has been lowered to a binary
917 /// operation). The check passes if all values in \p Checks (which are \c i1),
919 void ScalarExprEmitter::EmitBinOpCheck(
920 ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) {
921 assert(CGF.IsSanitizerScope);
923 SmallVector<llvm::Constant *, 4> StaticData;
924 SmallVector<llvm::Value *, 2> DynamicData;
926 BinaryOperatorKind Opcode = Info.Opcode;
927 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
928 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
930 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
931 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
932 if (UO && UO->getOpcode() == UO_Minus) {
933 CheckName = "negate_overflow";
934 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
935 DynamicData.push_back(Info.RHS);
937 if (BinaryOperator::isShiftOp(Opcode)) {
938 // Shift LHS negative or too large, or RHS out of bounds.
939 CheckName = "shift_out_of_bounds";
940 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
941 StaticData.push_back(
942 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
943 StaticData.push_back(
944 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
945 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
946 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
947 CheckName = "divrem_overflow";
948 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
950 // Arithmetic overflow (+, -, *).
952 case BO_Add: CheckName = "add_overflow"; break;
953 case BO_Sub: CheckName = "sub_overflow"; break;
954 case BO_Mul: CheckName = "mul_overflow"; break;
955 default: llvm_unreachable("unexpected opcode for bin op check");
957 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
959 DynamicData.push_back(Info.LHS);
960 DynamicData.push_back(Info.RHS);
963 CGF.EmitCheck(Checks, CheckName, StaticData, DynamicData);
966 //===----------------------------------------------------------------------===//
968 //===----------------------------------------------------------------------===//
970 Value *ScalarExprEmitter::VisitExpr(Expr *E) {
971 CGF.ErrorUnsupported(E, "scalar expression");
972 if (E->getType()->isVoidType())
974 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
977 Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
979 if (E->getNumSubExprs() == 2 ||
980 (E->getNumSubExprs() == 3 && E->getExpr(2)->getType()->isVectorType())) {
981 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
982 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
985 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
986 unsigned LHSElts = LTy->getNumElements();
988 if (E->getNumSubExprs() == 3) {
989 Mask = CGF.EmitScalarExpr(E->getExpr(2));
991 // Shuffle LHS & RHS into one input vector.
992 SmallVector<llvm::Constant*, 32> concat;
993 for (unsigned i = 0; i != LHSElts; ++i) {
994 concat.push_back(Builder.getInt32(2*i));
995 concat.push_back(Builder.getInt32(2*i+1));
998 Value* CV = llvm::ConstantVector::get(concat);
999 LHS = Builder.CreateShuffleVector(LHS, RHS, CV, "concat");
1005 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
1006 llvm::Constant* EltMask;
1008 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
1009 llvm::NextPowerOf2(LHSElts-1)-1);
1011 // Mask off the high bits of each shuffle index.
1012 Value *MaskBits = llvm::ConstantVector::getSplat(MTy->getNumElements(),
1014 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
1017 // mask = mask & maskbits
1019 // n = extract mask i
1020 // x = extract val n
1021 // newv = insert newv, x, i
1022 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
1023 MTy->getNumElements());
1024 Value* NewV = llvm::UndefValue::get(RTy);
1025 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
1026 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
1027 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
1029 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
1030 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
1035 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
1036 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
1038 SmallVector<llvm::Constant*, 32> indices;
1039 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
1040 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
1041 // Check for -1 and output it as undef in the IR.
1042 if (Idx.isSigned() && Idx.isAllOnesValue())
1043 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
1045 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
1048 Value *SV = llvm::ConstantVector::get(indices);
1049 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
1052 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
1053 QualType SrcType = E->getSrcExpr()->getType(),
1054 DstType = E->getType();
1056 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
1058 SrcType = CGF.getContext().getCanonicalType(SrcType);
1059 DstType = CGF.getContext().getCanonicalType(DstType);
1060 if (SrcType == DstType) return Src;
1062 assert(SrcType->isVectorType() &&
1063 "ConvertVector source type must be a vector");
1064 assert(DstType->isVectorType() &&
1065 "ConvertVector destination type must be a vector");
1067 llvm::Type *SrcTy = Src->getType();
1068 llvm::Type *DstTy = ConvertType(DstType);
1070 // Ignore conversions like int -> uint.
1074 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
1075 DstEltType = DstType->getAs<VectorType>()->getElementType();
1077 assert(SrcTy->isVectorTy() &&
1078 "ConvertVector source IR type must be a vector");
1079 assert(DstTy->isVectorTy() &&
1080 "ConvertVector destination IR type must be a vector");
1082 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1083 *DstEltTy = DstTy->getVectorElementType();
1085 if (DstEltType->isBooleanType()) {
1086 assert((SrcEltTy->isFloatingPointTy() ||
1087 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1089 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1090 if (SrcEltTy->isFloatingPointTy()) {
1091 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1093 return Builder.CreateICmpNE(Src, Zero, "tobool");
1097 // We have the arithmetic types: real int/float.
1098 Value *Res = nullptr;
1100 if (isa<llvm::IntegerType>(SrcEltTy)) {
1101 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1102 if (isa<llvm::IntegerType>(DstEltTy))
1103 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1104 else if (InputSigned)
1105 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1107 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1108 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1109 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1110 if (DstEltType->isSignedIntegerOrEnumerationType())
1111 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1113 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1115 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1116 "Unknown real conversion");
1117 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1118 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1120 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1126 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1128 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1130 CGF.EmitScalarExpr(E->getBase());
1132 EmitLValue(E->getBase());
1133 return Builder.getInt(Value);
1136 return EmitLoadOfLValue(E);
1139 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1140 TestAndClearIgnoreResultAssign();
1142 // Emit subscript expressions in rvalue context's. For most cases, this just
1143 // loads the lvalue formed by the subscript expr. However, we have to be
1144 // careful, because the base of a vector subscript is occasionally an rvalue,
1145 // so we can't get it as an lvalue.
1146 if (!E->getBase()->getType()->isVectorType())
1147 return EmitLoadOfLValue(E);
1149 // Handle the vector case. The base must be a vector, the index must be an
1151 Value *Base = Visit(E->getBase());
1152 Value *Idx = Visit(E->getIdx());
1153 QualType IdxTy = E->getIdx()->getType();
1155 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
1156 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1158 return Builder.CreateExtractElement(Base, Idx, "vecext");
1161 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1162 unsigned Off, llvm::Type *I32Ty) {
1163 int MV = SVI->getMaskValue(Idx);
1165 return llvm::UndefValue::get(I32Ty);
1166 return llvm::ConstantInt::get(I32Ty, Off+MV);
1169 static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) {
1170 if (C->getBitWidth() != 32) {
1171 assert(llvm::ConstantInt::isValueValidForType(I32Ty,
1172 C->getZExtValue()) &&
1173 "Index operand too large for shufflevector mask!");
1174 return llvm::ConstantInt::get(I32Ty, C->getZExtValue());
1179 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1180 bool Ignore = TestAndClearIgnoreResultAssign();
1182 assert (Ignore == false && "init list ignored");
1183 unsigned NumInitElements = E->getNumInits();
1185 if (E->hadArrayRangeDesignator())
1186 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1188 llvm::VectorType *VType =
1189 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1192 if (NumInitElements == 0) {
1193 // C++11 value-initialization for the scalar.
1194 return EmitNullValue(E->getType());
1196 // We have a scalar in braces. Just use the first element.
1197 return Visit(E->getInit(0));
1200 unsigned ResElts = VType->getNumElements();
1202 // Loop over initializers collecting the Value for each, and remembering
1203 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1204 // us to fold the shuffle for the swizzle into the shuffle for the vector
1205 // initializer, since LLVM optimizers generally do not want to touch
1207 unsigned CurIdx = 0;
1208 bool VIsUndefShuffle = false;
1209 llvm::Value *V = llvm::UndefValue::get(VType);
1210 for (unsigned i = 0; i != NumInitElements; ++i) {
1211 Expr *IE = E->getInit(i);
1212 Value *Init = Visit(IE);
1213 SmallVector<llvm::Constant*, 16> Args;
1215 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1217 // Handle scalar elements. If the scalar initializer is actually one
1218 // element of a different vector of the same width, use shuffle instead of
1221 if (isa<ExtVectorElementExpr>(IE)) {
1222 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1224 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1225 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1226 Value *LHS = nullptr, *RHS = nullptr;
1228 // insert into undef -> shuffle (src, undef)
1229 // shufflemask must use an i32
1230 Args.push_back(getAsInt32(C, CGF.Int32Ty));
1231 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1233 LHS = EI->getVectorOperand();
1235 VIsUndefShuffle = true;
1236 } else if (VIsUndefShuffle) {
1237 // insert into undefshuffle && size match -> shuffle (v, src)
1238 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1239 for (unsigned j = 0; j != CurIdx; ++j)
1240 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1241 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1242 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1244 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1245 RHS = EI->getVectorOperand();
1246 VIsUndefShuffle = false;
1248 if (!Args.empty()) {
1249 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1250 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1256 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1258 VIsUndefShuffle = false;
1263 unsigned InitElts = VVT->getNumElements();
1265 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1266 // input is the same width as the vector being constructed, generate an
1267 // optimized shuffle of the swizzle input into the result.
1268 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1269 if (isa<ExtVectorElementExpr>(IE)) {
1270 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1271 Value *SVOp = SVI->getOperand(0);
1272 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1274 if (OpTy->getNumElements() == ResElts) {
1275 for (unsigned j = 0; j != CurIdx; ++j) {
1276 // If the current vector initializer is a shuffle with undef, merge
1277 // this shuffle directly into it.
1278 if (VIsUndefShuffle) {
1279 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1282 Args.push_back(Builder.getInt32(j));
1285 for (unsigned j = 0, je = InitElts; j != je; ++j)
1286 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1287 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1289 if (VIsUndefShuffle)
1290 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1296 // Extend init to result vector length, and then shuffle its contribution
1297 // to the vector initializer into V.
1299 for (unsigned j = 0; j != InitElts; ++j)
1300 Args.push_back(Builder.getInt32(j));
1301 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1302 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1303 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1307 for (unsigned j = 0; j != CurIdx; ++j)
1308 Args.push_back(Builder.getInt32(j));
1309 for (unsigned j = 0; j != InitElts; ++j)
1310 Args.push_back(Builder.getInt32(j+Offset));
1311 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1314 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1315 // merging subsequent shuffles into this one.
1318 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1319 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1320 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1324 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1325 // Emit remaining default initializers.
1326 llvm::Type *EltTy = VType->getElementType();
1328 // Emit remaining default initializers
1329 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1330 Value *Idx = Builder.getInt32(CurIdx);
1331 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1332 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1337 static bool ShouldNullCheckClassCastValue(const CastExpr *CE) {
1338 const Expr *E = CE->getSubExpr();
1340 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1343 if (isa<CXXThisExpr>(E)) {
1344 // We always assume that 'this' is never null.
1348 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1349 // And that glvalue casts are never null.
1350 if (ICE->getValueKind() != VK_RValue)
1357 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1358 // have to handle a more broad range of conversions than explicit casts, as they
1359 // handle things like function to ptr-to-function decay etc.
1360 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1361 Expr *E = CE->getSubExpr();
1362 QualType DestTy = CE->getType();
1363 CastKind Kind = CE->getCastKind();
1365 if (!DestTy->isVoidType())
1366 TestAndClearIgnoreResultAssign();
1368 // Since almost all cast kinds apply to scalars, this switch doesn't have
1369 // a default case, so the compiler will warn on a missing case. The cases
1370 // are in the same order as in the CastKind enum.
1372 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1373 case CK_BuiltinFnToFnPtr:
1374 llvm_unreachable("builtin functions are handled elsewhere");
1376 case CK_LValueBitCast:
1377 case CK_ObjCObjectLValueCast: {
1378 Value *V = EmitLValue(E).getAddress();
1379 V = Builder.CreateBitCast(V,
1380 ConvertType(CGF.getContext().getPointerType(DestTy)));
1381 return EmitLoadOfLValue(CGF.MakeNaturalAlignAddrLValue(V, DestTy),
1385 case CK_CPointerToObjCPointerCast:
1386 case CK_BlockPointerToObjCPointerCast:
1387 case CK_AnyPointerToBlockPointerCast:
1389 Value *Src = Visit(const_cast<Expr*>(E));
1390 llvm::Type *SrcTy = Src->getType();
1391 llvm::Type *DstTy = ConvertType(DestTy);
1392 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1393 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1394 llvm_unreachable("wrong cast for pointers in different address spaces"
1395 "(must be an address space cast)!");
1398 if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
1399 if (auto PT = DestTy->getAs<PointerType>())
1400 CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src,
1402 CodeGenFunction::CFITCK_UnrelatedCast,
1406 return Builder.CreateBitCast(Src, DstTy);
1408 case CK_AddressSpaceConversion: {
1409 Value *Src = Visit(const_cast<Expr*>(E));
1410 return Builder.CreateAddrSpaceCast(Src, ConvertType(DestTy));
1412 case CK_AtomicToNonAtomic:
1413 case CK_NonAtomicToAtomic:
1415 case CK_UserDefinedConversion:
1416 return Visit(const_cast<Expr*>(E));
1418 case CK_BaseToDerived: {
1419 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1420 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1422 llvm::Value *V = Visit(E);
1424 llvm::Value *Derived =
1425 CGF.GetAddressOfDerivedClass(V, DerivedClassDecl,
1426 CE->path_begin(), CE->path_end(),
1427 ShouldNullCheckClassCastValue(CE));
1429 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1430 // performed and the object is not of the derived type.
1431 if (CGF.sanitizePerformTypeCheck())
1432 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1433 Derived, DestTy->getPointeeType());
1435 if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
1436 CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(), Derived,
1438 CodeGenFunction::CFITCK_DerivedCast,
1443 case CK_UncheckedDerivedToBase:
1444 case CK_DerivedToBase: {
1445 const CXXRecordDecl *DerivedClassDecl =
1446 E->getType()->getPointeeCXXRecordDecl();
1447 assert(DerivedClassDecl && "DerivedToBase arg isn't a C++ object pointer!");
1449 return CGF.GetAddressOfBaseClass(
1450 Visit(E), DerivedClassDecl, CE->path_begin(), CE->path_end(),
1451 ShouldNullCheckClassCastValue(CE), CE->getExprLoc());
1454 Value *V = Visit(const_cast<Expr*>(E));
1455 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1456 return CGF.EmitDynamicCast(V, DCE);
1459 case CK_ArrayToPointerDecay: {
1460 assert(E->getType()->isArrayType() &&
1461 "Array to pointer decay must have array source type!");
1463 Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays.
1465 // Note that VLA pointers are always decayed, so we don't need to do
1467 if (!E->getType()->isVariableArrayType()) {
1468 assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer");
1469 llvm::Type *NewTy = ConvertType(E->getType());
1470 V = CGF.Builder.CreatePointerCast(
1471 V, NewTy->getPointerTo(V->getType()->getPointerAddressSpace()));
1473 assert(isa<llvm::ArrayType>(V->getType()->getPointerElementType()) &&
1474 "Expected pointer to array");
1475 V = Builder.CreateStructGEP(NewTy, V, 0, "arraydecay");
1478 // Make sure the array decay ends up being the right type. This matters if
1479 // the array type was of an incomplete type.
1480 return CGF.Builder.CreatePointerCast(V, ConvertType(CE->getType()));
1482 case CK_FunctionToPointerDecay:
1483 return EmitLValue(E).getAddress();
1485 case CK_NullToPointer:
1486 if (MustVisitNullValue(E))
1489 return llvm::ConstantPointerNull::get(
1490 cast<llvm::PointerType>(ConvertType(DestTy)));
1492 case CK_NullToMemberPointer: {
1493 if (MustVisitNullValue(E))
1496 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1497 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1500 case CK_ReinterpretMemberPointer:
1501 case CK_BaseToDerivedMemberPointer:
1502 case CK_DerivedToBaseMemberPointer: {
1503 Value *Src = Visit(E);
1505 // Note that the AST doesn't distinguish between checked and
1506 // unchecked member pointer conversions, so we always have to
1507 // implement checked conversions here. This is inefficient when
1508 // actual control flow may be required in order to perform the
1509 // check, which it is for data member pointers (but not member
1510 // function pointers on Itanium and ARM).
1511 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1514 case CK_ARCProduceObject:
1515 return CGF.EmitARCRetainScalarExpr(E);
1516 case CK_ARCConsumeObject:
1517 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1518 case CK_ARCReclaimReturnedObject: {
1519 llvm::Value *value = Visit(E);
1520 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
1521 return CGF.EmitObjCConsumeObject(E->getType(), value);
1523 case CK_ARCExtendBlockObject:
1524 return CGF.EmitARCExtendBlockObject(E);
1526 case CK_CopyAndAutoreleaseBlockObject:
1527 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1529 case CK_FloatingRealToComplex:
1530 case CK_FloatingComplexCast:
1531 case CK_IntegralRealToComplex:
1532 case CK_IntegralComplexCast:
1533 case CK_IntegralComplexToFloatingComplex:
1534 case CK_FloatingComplexToIntegralComplex:
1535 case CK_ConstructorConversion:
1537 llvm_unreachable("scalar cast to non-scalar value");
1539 case CK_LValueToRValue:
1540 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1541 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1542 return Visit(const_cast<Expr*>(E));
1544 case CK_IntegralToPointer: {
1545 Value *Src = Visit(const_cast<Expr*>(E));
1547 // First, convert to the correct width so that we control the kind of
1549 llvm::Type *MiddleTy = CGF.IntPtrTy;
1550 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1551 llvm::Value* IntResult =
1552 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1554 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
1556 case CK_PointerToIntegral:
1557 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1558 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1561 CGF.EmitIgnoredExpr(E);
1564 case CK_VectorSplat: {
1565 llvm::Type *DstTy = ConvertType(DestTy);
1566 Value *Elt = Visit(const_cast<Expr*>(E));
1567 Elt = EmitScalarConversion(Elt, E->getType(),
1568 DestTy->getAs<VectorType>()->getElementType());
1570 // Splat the element across to all elements
1571 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
1572 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1575 case CK_IntegralCast:
1576 case CK_IntegralToFloating:
1577 case CK_FloatingToIntegral:
1578 case CK_FloatingCast:
1579 return EmitScalarConversion(Visit(E), E->getType(), DestTy);
1580 case CK_IntegralToBoolean:
1581 return EmitIntToBoolConversion(Visit(E));
1582 case CK_PointerToBoolean:
1583 return EmitPointerToBoolConversion(Visit(E));
1584 case CK_FloatingToBoolean:
1585 return EmitFloatToBoolConversion(Visit(E));
1586 case CK_MemberPointerToBoolean: {
1587 llvm::Value *MemPtr = Visit(E);
1588 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1589 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1592 case CK_FloatingComplexToReal:
1593 case CK_IntegralComplexToReal:
1594 return CGF.EmitComplexExpr(E, false, true).first;
1596 case CK_FloatingComplexToBoolean:
1597 case CK_IntegralComplexToBoolean: {
1598 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1600 // TODO: kill this function off, inline appropriate case here
1601 return EmitComplexToScalarConversion(V, E->getType(), DestTy);
1604 case CK_ZeroToOCLEvent: {
1605 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1606 return llvm::Constant::getNullValue(ConvertType(DestTy));
1611 llvm_unreachable("unknown scalar cast");
1614 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1615 CodeGenFunction::StmtExprEvaluation eval(CGF);
1616 llvm::Value *RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1617 !E->getType()->isVoidType());
1620 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1624 //===----------------------------------------------------------------------===//
1626 //===----------------------------------------------------------------------===//
1628 static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
1629 llvm::Value *InVal, bool IsInc) {
1632 BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
1633 BinOp.Ty = E->getType();
1634 BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
1635 BinOp.FPContractable = false;
1640 llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
1641 const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
1642 llvm::Value *Amount =
1643 llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true);
1644 StringRef Name = IsInc ? "inc" : "dec";
1645 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1646 case LangOptions::SOB_Defined:
1647 return Builder.CreateAdd(InVal, Amount, Name);
1648 case LangOptions::SOB_Undefined:
1649 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
1650 return Builder.CreateNSWAdd(InVal, Amount, Name);
1652 case LangOptions::SOB_Trapping:
1653 return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc));
1655 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1659 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1660 bool isInc, bool isPre) {
1662 QualType type = E->getSubExpr()->getType();
1663 llvm::PHINode *atomicPHI = nullptr;
1667 int amount = (isInc ? 1 : -1);
1669 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1670 type = atomicTy->getValueType();
1671 if (isInc && type->isBooleanType()) {
1672 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1674 Builder.Insert(new llvm::StoreInst(True,
1675 LV.getAddress(), LV.isVolatileQualified(),
1676 LV.getAlignment().getQuantity(),
1677 llvm::SequentiallyConsistent));
1678 return Builder.getTrue();
1680 // For atomic bool increment, we just store true and return it for
1681 // preincrement, do an atomic swap with true for postincrement
1682 return Builder.CreateAtomicRMW(llvm::AtomicRMWInst::Xchg,
1683 LV.getAddress(), True, llvm::SequentiallyConsistent);
1685 // Special case for atomic increment / decrement on integers, emit
1686 // atomicrmw instructions. We skip this if we want to be doing overflow
1687 // checking, and fall into the slow path with the atomic cmpxchg loop.
1688 if (!type->isBooleanType() && type->isIntegerType() &&
1689 !(type->isUnsignedIntegerType() &&
1690 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
1691 CGF.getLangOpts().getSignedOverflowBehavior() !=
1692 LangOptions::SOB_Trapping) {
1693 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1694 llvm::AtomicRMWInst::Sub;
1695 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1696 llvm::Instruction::Sub;
1697 llvm::Value *amt = CGF.EmitToMemory(
1698 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1699 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1700 LV.getAddress(), amt, llvm::SequentiallyConsistent);
1701 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1703 value = EmitLoadOfLValue(LV, E->getExprLoc());
1705 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1706 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1707 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1708 value = CGF.EmitToMemory(value, type);
1709 Builder.CreateBr(opBB);
1710 Builder.SetInsertPoint(opBB);
1711 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1712 atomicPHI->addIncoming(value, startBB);
1715 value = EmitLoadOfLValue(LV, E->getExprLoc());
1719 // Special case of integer increment that we have to check first: bool++.
1720 // Due to promotion rules, we get:
1721 // bool++ -> bool = bool + 1
1722 // -> bool = (int)bool + 1
1723 // -> bool = ((int)bool + 1 != 0)
1724 // An interesting aspect of this is that increment is always true.
1725 // Decrement does not have this property.
1726 if (isInc && type->isBooleanType()) {
1727 value = Builder.getTrue();
1729 // Most common case by far: integer increment.
1730 } else if (type->isIntegerType()) {
1731 // Note that signed integer inc/dec with width less than int can't
1732 // overflow because of promotion rules; we're just eliding a few steps here.
1733 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1734 CGF.IntTy->getIntegerBitWidth();
1735 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1736 value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
1737 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1738 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
1740 EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc));
1742 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1743 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1746 // Next most common: pointer increment.
1747 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1748 QualType type = ptr->getPointeeType();
1750 // VLA types don't have constant size.
1751 if (const VariableArrayType *vla
1752 = CGF.getContext().getAsVariableArrayType(type)) {
1753 llvm::Value *numElts = CGF.getVLASize(vla).first;
1754 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1755 if (CGF.getLangOpts().isSignedOverflowDefined())
1756 value = Builder.CreateGEP(value, numElts, "vla.inc");
1758 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1760 // Arithmetic on function pointers (!) is just +-1.
1761 } else if (type->isFunctionType()) {
1762 llvm::Value *amt = Builder.getInt32(amount);
1764 value = CGF.EmitCastToVoidPtr(value);
1765 if (CGF.getLangOpts().isSignedOverflowDefined())
1766 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1768 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1769 value = Builder.CreateBitCast(value, input->getType());
1771 // For everything else, we can just do a simple increment.
1773 llvm::Value *amt = Builder.getInt32(amount);
1774 if (CGF.getLangOpts().isSignedOverflowDefined())
1775 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1777 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1780 // Vector increment/decrement.
1781 } else if (type->isVectorType()) {
1782 if (type->hasIntegerRepresentation()) {
1783 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1785 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1787 value = Builder.CreateFAdd(
1789 llvm::ConstantFP::get(value->getType(), amount),
1790 isInc ? "inc" : "dec");
1794 } else if (type->isRealFloatingType()) {
1795 // Add the inc/dec to the real part.
1798 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1799 // Another special case: half FP increment should be done via float
1800 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1801 value = Builder.CreateCall(
1802 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1804 input, "incdec.conv");
1806 value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv");
1810 if (value->getType()->isFloatTy())
1811 amt = llvm::ConstantFP::get(VMContext,
1812 llvm::APFloat(static_cast<float>(amount)));
1813 else if (value->getType()->isDoubleTy())
1814 amt = llvm::ConstantFP::get(VMContext,
1815 llvm::APFloat(static_cast<double>(amount)));
1817 // Remaining types are either Half or LongDouble. Convert from float.
1818 llvm::APFloat F(static_cast<float>(amount));
1820 // Don't use getFloatTypeSemantics because Half isn't
1821 // necessarily represented using the "half" LLVM type.
1822 F.convert(value->getType()->isHalfTy()
1823 ? CGF.getTarget().getHalfFormat()
1824 : CGF.getTarget().getLongDoubleFormat(),
1825 llvm::APFloat::rmTowardZero, &ignored);
1826 amt = llvm::ConstantFP::get(VMContext, F);
1828 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1830 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1831 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1832 value = Builder.CreateCall(
1833 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
1835 value, "incdec.conv");
1837 value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv");
1841 // Objective-C pointer types.
1843 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1844 value = CGF.EmitCastToVoidPtr(value);
1846 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1847 if (!isInc) size = -size;
1848 llvm::Value *sizeValue =
1849 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1851 if (CGF.getLangOpts().isSignedOverflowDefined())
1852 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1854 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
1855 value = Builder.CreateBitCast(value, input->getType());
1859 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1860 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1861 auto Pair = CGF.EmitAtomicCompareExchange(
1862 LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
1863 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
1864 llvm::Value *success = Pair.second;
1865 atomicPHI->addIncoming(old, opBB);
1866 Builder.CreateCondBr(success, contBB, opBB);
1867 Builder.SetInsertPoint(contBB);
1868 return isPre ? value : input;
1871 // Store the updated result through the lvalue.
1872 if (LV.isBitField())
1873 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
1875 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
1877 // If this is a postinc, return the value read from memory, otherwise use the
1879 return isPre ? value : input;
1884 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
1885 TestAndClearIgnoreResultAssign();
1886 // Emit unary minus with EmitSub so we handle overflow cases etc.
1888 BinOp.RHS = Visit(E->getSubExpr());
1890 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1891 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1893 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
1894 BinOp.Ty = E->getType();
1895 BinOp.Opcode = BO_Sub;
1896 BinOp.FPContractable = false;
1898 return EmitSub(BinOp);
1901 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
1902 TestAndClearIgnoreResultAssign();
1903 Value *Op = Visit(E->getSubExpr());
1904 return Builder.CreateNot(Op, "neg");
1907 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1908 // Perform vector logical not on comparison with zero vector.
1909 if (E->getType()->isExtVectorType()) {
1910 Value *Oper = Visit(E->getSubExpr());
1911 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1913 if (Oper->getType()->isFPOrFPVectorTy())
1914 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1916 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1917 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1920 // Compare operand to zero.
1921 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
1924 // TODO: Could dynamically modify easy computations here. For example, if
1925 // the operand is an icmp ne, turn into icmp eq.
1926 BoolVal = Builder.CreateNot(BoolVal, "lnot");
1928 // ZExt result to the expr type.
1929 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
1932 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1933 // Try folding the offsetof to a constant.
1935 if (E->EvaluateAsInt(Value, CGF.getContext()))
1936 return Builder.getInt(Value);
1938 // Loop over the components of the offsetof to compute the value.
1939 unsigned n = E->getNumComponents();
1940 llvm::Type* ResultType = ConvertType(E->getType());
1941 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1942 QualType CurrentType = E->getTypeSourceInfo()->getType();
1943 for (unsigned i = 0; i != n; ++i) {
1944 OffsetOfExpr::OffsetOfNode ON = E->getComponent(i);
1945 llvm::Value *Offset = nullptr;
1946 switch (ON.getKind()) {
1947 case OffsetOfExpr::OffsetOfNode::Array: {
1948 // Compute the index
1949 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1950 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1951 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
1952 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1954 // Save the element type
1956 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1958 // Compute the element size
1959 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1960 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1962 // Multiply out to compute the result
1963 Offset = Builder.CreateMul(Idx, ElemSize);
1967 case OffsetOfExpr::OffsetOfNode::Field: {
1968 FieldDecl *MemberDecl = ON.getField();
1969 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1970 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1972 // Compute the index of the field in its parent.
1974 // FIXME: It would be nice if we didn't have to loop here!
1975 for (RecordDecl::field_iterator Field = RD->field_begin(),
1976 FieldEnd = RD->field_end();
1977 Field != FieldEnd; ++Field, ++i) {
1978 if (*Field == MemberDecl)
1981 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1983 // Compute the offset to the field
1984 int64_t OffsetInt = RL.getFieldOffset(i) /
1985 CGF.getContext().getCharWidth();
1986 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1988 // Save the element type.
1989 CurrentType = MemberDecl->getType();
1993 case OffsetOfExpr::OffsetOfNode::Identifier:
1994 llvm_unreachable("dependent __builtin_offsetof");
1996 case OffsetOfExpr::OffsetOfNode::Base: {
1997 if (ON.getBase()->isVirtual()) {
1998 CGF.ErrorUnsupported(E, "virtual base in offsetof");
2002 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
2003 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
2005 // Save the element type.
2006 CurrentType = ON.getBase()->getType();
2008 // Compute the offset to the base.
2009 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
2010 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
2011 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
2012 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
2016 Result = Builder.CreateAdd(Result, Offset);
2021 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
2022 /// argument of the sizeof expression as an integer.
2024 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
2025 const UnaryExprOrTypeTraitExpr *E) {
2026 QualType TypeToSize = E->getTypeOfArgument();
2027 if (E->getKind() == UETT_SizeOf) {
2028 if (const VariableArrayType *VAT =
2029 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
2030 if (E->isArgumentType()) {
2031 // sizeof(type) - make sure to emit the VLA size.
2032 CGF.EmitVariablyModifiedType(TypeToSize);
2034 // C99 6.5.3.4p2: If the argument is an expression of type
2035 // VLA, it is evaluated.
2036 CGF.EmitIgnoredExpr(E->getArgumentExpr());
2040 llvm::Value *numElts;
2041 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
2043 llvm::Value *size = numElts;
2045 // Scale the number of non-VLA elements by the non-VLA element size.
2046 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
2047 if (!eltSize.isOne())
2048 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
2052 } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) {
2055 .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign(
2056 E->getTypeOfArgument()->getPointeeType()))
2058 return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
2061 // If this isn't sizeof(vla), the result must be constant; use the constant
2062 // folding logic so we don't have to duplicate it here.
2063 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
2066 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
2067 Expr *Op = E->getSubExpr();
2068 if (Op->getType()->isAnyComplexType()) {
2069 // If it's an l-value, load through the appropriate subobject l-value.
2070 // Note that we have to ask E because Op might be an l-value that
2071 // this won't work for, e.g. an Obj-C property.
2073 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2074 E->getExprLoc()).getScalarVal();
2076 // Otherwise, calculate and project.
2077 return CGF.EmitComplexExpr(Op, false, true).first;
2083 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
2084 Expr *Op = E->getSubExpr();
2085 if (Op->getType()->isAnyComplexType()) {
2086 // If it's an l-value, load through the appropriate subobject l-value.
2087 // Note that we have to ask E because Op might be an l-value that
2088 // this won't work for, e.g. an Obj-C property.
2089 if (Op->isGLValue())
2090 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2091 E->getExprLoc()).getScalarVal();
2093 // Otherwise, calculate and project.
2094 return CGF.EmitComplexExpr(Op, true, false).second;
2097 // __imag on a scalar returns zero. Emit the subexpr to ensure side
2098 // effects are evaluated, but not the actual value.
2099 if (Op->isGLValue())
2102 CGF.EmitScalarExpr(Op, true);
2103 return llvm::Constant::getNullValue(ConvertType(E->getType()));
2106 //===----------------------------------------------------------------------===//
2108 //===----------------------------------------------------------------------===//
2110 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
2111 TestAndClearIgnoreResultAssign();
2113 Result.LHS = Visit(E->getLHS());
2114 Result.RHS = Visit(E->getRHS());
2115 Result.Ty = E->getType();
2116 Result.Opcode = E->getOpcode();
2117 Result.FPContractable = E->isFPContractable();
2122 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
2123 const CompoundAssignOperator *E,
2124 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2126 QualType LHSTy = E->getLHS()->getType();
2129 if (E->getComputationResultType()->isAnyComplexType())
2130 return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
2132 // Emit the RHS first. __block variables need to have the rhs evaluated
2133 // first, plus this should improve codegen a little.
2134 OpInfo.RHS = Visit(E->getRHS());
2135 OpInfo.Ty = E->getComputationResultType();
2136 OpInfo.Opcode = E->getOpcode();
2137 OpInfo.FPContractable = false;
2139 // Load/convert the LHS.
2140 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2142 llvm::PHINode *atomicPHI = nullptr;
2143 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2144 QualType type = atomicTy->getValueType();
2145 if (!type->isBooleanType() && type->isIntegerType() &&
2146 !(type->isUnsignedIntegerType() &&
2147 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
2148 CGF.getLangOpts().getSignedOverflowBehavior() !=
2149 LangOptions::SOB_Trapping) {
2150 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2151 switch (OpInfo.Opcode) {
2152 // We don't have atomicrmw operands for *, %, /, <<, >>
2153 case BO_MulAssign: case BO_DivAssign:
2159 aop = llvm::AtomicRMWInst::Add;
2162 aop = llvm::AtomicRMWInst::Sub;
2165 aop = llvm::AtomicRMWInst::And;
2168 aop = llvm::AtomicRMWInst::Xor;
2171 aop = llvm::AtomicRMWInst::Or;
2174 llvm_unreachable("Invalid compound assignment type");
2176 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2177 llvm::Value *amt = CGF.EmitToMemory(EmitScalarConversion(OpInfo.RHS,
2178 E->getRHS()->getType(), LHSTy), LHSTy);
2179 Builder.CreateAtomicRMW(aop, LHSLV.getAddress(), amt,
2180 llvm::SequentiallyConsistent);
2184 // FIXME: For floating point types, we should be saving and restoring the
2185 // floating point environment in the loop.
2186 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2187 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2188 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2189 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2190 Builder.CreateBr(opBB);
2191 Builder.SetInsertPoint(opBB);
2192 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2193 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2194 OpInfo.LHS = atomicPHI;
2197 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2199 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
2200 E->getComputationLHSType());
2202 // Expand the binary operator.
2203 Result = (this->*Func)(OpInfo);
2205 // Convert the result back to the LHS type.
2206 Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy);
2209 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2210 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2211 auto Pair = CGF.EmitAtomicCompareExchange(
2212 LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
2213 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
2214 llvm::Value *success = Pair.second;
2215 atomicPHI->addIncoming(old, opBB);
2216 Builder.CreateCondBr(success, contBB, opBB);
2217 Builder.SetInsertPoint(contBB);
2221 // Store the result value into the LHS lvalue. Bit-fields are handled
2222 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2223 // 'An assignment expression has the value of the left operand after the
2225 if (LHSLV.isBitField())
2226 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2228 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2233 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2234 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2235 bool Ignore = TestAndClearIgnoreResultAssign();
2237 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2239 // If the result is clearly ignored, return now.
2243 // The result of an assignment in C is the assigned r-value.
2244 if (!CGF.getLangOpts().CPlusPlus)
2247 // If the lvalue is non-volatile, return the computed value of the assignment.
2248 if (!LHS.isVolatileQualified())
2251 // Otherwise, reload the value.
2252 return EmitLoadOfLValue(LHS, E->getExprLoc());
2255 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2256 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2257 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks;
2259 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2260 Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
2261 SanitizerKind::IntegerDivideByZero));
2264 if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
2265 Ops.Ty->hasSignedIntegerRepresentation()) {
2266 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2268 llvm::Value *IntMin =
2269 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2270 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2272 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2273 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2274 llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2276 std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow));
2279 if (Checks.size() > 0)
2280 EmitBinOpCheck(Checks, Ops);
2283 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2285 CodeGenFunction::SanitizerScope SanScope(&CGF);
2286 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2287 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2288 Ops.Ty->isIntegerType()) {
2289 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2290 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2291 } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
2292 Ops.Ty->isRealFloatingType()) {
2293 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2294 llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
2295 EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero),
2300 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2301 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2302 if (CGF.getLangOpts().OpenCL) {
2303 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
2304 llvm::Type *ValTy = Val->getType();
2305 if (ValTy->isFloatTy() ||
2306 (isa<llvm::VectorType>(ValTy) &&
2307 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2308 CGF.SetFPAccuracy(Val, 2.5);
2312 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2313 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2315 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2318 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2319 // Rem in C can't be a floating point type: C99 6.5.5p2.
2320 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2321 CodeGenFunction::SanitizerScope SanScope(&CGF);
2322 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2324 if (Ops.Ty->isIntegerType())
2325 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2328 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2329 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2331 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2334 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2338 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2339 switch (Ops.Opcode) {
2343 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2344 llvm::Intrinsic::uadd_with_overflow;
2349 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2350 llvm::Intrinsic::usub_with_overflow;
2355 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2356 llvm::Intrinsic::umul_with_overflow;
2359 llvm_unreachable("Unsupported operation for overflow detection");
2365 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2367 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2369 Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
2370 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2371 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2373 // Handle overflow with llvm.trap if no custom handler has been specified.
2374 const std::string *handlerName =
2375 &CGF.getLangOpts().OverflowHandler;
2376 if (handlerName->empty()) {
2377 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2378 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2379 if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
2380 CodeGenFunction::SanitizerScope SanScope(&CGF);
2381 llvm::Value *NotOverflow = Builder.CreateNot(overflow);
2382 SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow
2383 : SanitizerKind::UnsignedIntegerOverflow;
2384 EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops);
2386 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2390 // Branch in case of overflow.
2391 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2392 llvm::Function::iterator insertPt = initialBB;
2393 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2394 std::next(insertPt));
2395 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2397 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2399 // If an overflow handler is set, then we want to call it and then use its
2400 // result, if it returns.
2401 Builder.SetInsertPoint(overflowBB);
2403 // Get the overflow handler.
2404 llvm::Type *Int8Ty = CGF.Int8Ty;
2405 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2406 llvm::FunctionType *handlerTy =
2407 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2408 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2410 // Sign extend the args to 64-bit, so that we can use the same handler for
2411 // all types of overflow.
2412 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2413 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2415 // Call the handler with the two arguments, the operation, and the size of
2417 llvm::Value *handlerArgs[] = {
2420 Builder.getInt8(OpID),
2421 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2423 llvm::Value *handlerResult =
2424 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2426 // Truncate the result back to the desired size.
2427 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2428 Builder.CreateBr(continueBB);
2430 Builder.SetInsertPoint(continueBB);
2431 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2432 phi->addIncoming(result, initialBB);
2433 phi->addIncoming(handlerResult, overflowBB);
2438 /// Emit pointer + index arithmetic.
2439 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2440 const BinOpInfo &op,
2441 bool isSubtraction) {
2442 // Must have binary (not unary) expr here. Unary pointer
2443 // increment/decrement doesn't use this path.
2444 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2446 Value *pointer = op.LHS;
2447 Expr *pointerOperand = expr->getLHS();
2448 Value *index = op.RHS;
2449 Expr *indexOperand = expr->getRHS();
2451 // In a subtraction, the LHS is always the pointer.
2452 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2453 std::swap(pointer, index);
2454 std::swap(pointerOperand, indexOperand);
2457 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2458 if (width != CGF.PointerWidthInBits) {
2459 // Zero-extend or sign-extend the pointer value according to
2460 // whether the index is signed or not.
2461 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2462 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2466 // If this is subtraction, negate the index.
2468 index = CGF.Builder.CreateNeg(index, "idx.neg");
2470 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
2471 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2472 /*Accessed*/ false);
2474 const PointerType *pointerType
2475 = pointerOperand->getType()->getAs<PointerType>();
2477 QualType objectType = pointerOperand->getType()
2478 ->castAs<ObjCObjectPointerType>()
2480 llvm::Value *objectSize
2481 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2483 index = CGF.Builder.CreateMul(index, objectSize);
2485 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2486 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2487 return CGF.Builder.CreateBitCast(result, pointer->getType());
2490 QualType elementType = pointerType->getPointeeType();
2491 if (const VariableArrayType *vla
2492 = CGF.getContext().getAsVariableArrayType(elementType)) {
2493 // The element count here is the total number of non-VLA elements.
2494 llvm::Value *numElements = CGF.getVLASize(vla).first;
2496 // Effectively, the multiply by the VLA size is part of the GEP.
2497 // GEP indexes are signed, and scaling an index isn't permitted to
2498 // signed-overflow, so we use the same semantics for our explicit
2499 // multiply. We suppress this if overflow is not undefined behavior.
2500 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2501 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2502 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2504 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2505 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2510 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2511 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2513 if (elementType->isVoidType() || elementType->isFunctionType()) {
2514 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2515 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2516 return CGF.Builder.CreateBitCast(result, pointer->getType());
2519 if (CGF.getLangOpts().isSignedOverflowDefined())
2520 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2522 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2525 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2526 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2527 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2528 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2529 // efficient operations.
2530 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2531 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2532 bool negMul, bool negAdd) {
2533 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2535 Value *MulOp0 = MulOp->getOperand(0);
2536 Value *MulOp1 = MulOp->getOperand(1);
2540 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2542 } else if (negAdd) {
2545 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2549 Value *FMulAdd = Builder.CreateCall(
2550 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2551 {MulOp0, MulOp1, Addend});
2552 MulOp->eraseFromParent();
2557 // Check whether it would be legal to emit an fmuladd intrinsic call to
2558 // represent op and if so, build the fmuladd.
2560 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2561 // Does NOT check the type of the operation - it's assumed that this function
2562 // will be called from contexts where it's known that the type is contractable.
2563 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2564 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2567 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2568 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2569 "Only fadd/fsub can be the root of an fmuladd.");
2571 // Check whether this op is marked as fusable.
2572 if (!op.FPContractable)
2575 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2576 // either disabled, or handled entirely by the LLVM backend).
2577 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
2580 // We have a potentially fusable op. Look for a mul on one of the operands.
2581 if (llvm::BinaryOperator* LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2582 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul) {
2583 assert(LHSBinOp->getNumUses() == 0 &&
2584 "Operations with multiple uses shouldn't be contracted.");
2585 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2587 } else if (llvm::BinaryOperator* RHSBinOp =
2588 dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2589 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul) {
2590 assert(RHSBinOp->getNumUses() == 0 &&
2591 "Operations with multiple uses shouldn't be contracted.");
2592 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2599 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2600 if (op.LHS->getType()->isPointerTy() ||
2601 op.RHS->getType()->isPointerTy())
2602 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2604 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2605 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2606 case LangOptions::SOB_Defined:
2607 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2608 case LangOptions::SOB_Undefined:
2609 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2610 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2612 case LangOptions::SOB_Trapping:
2613 return EmitOverflowCheckedBinOp(op);
2617 if (op.Ty->isUnsignedIntegerType() &&
2618 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2619 return EmitOverflowCheckedBinOp(op);
2621 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2622 // Try to form an fmuladd.
2623 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2626 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
2629 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2632 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2633 // The LHS is always a pointer if either side is.
2634 if (!op.LHS->getType()->isPointerTy()) {
2635 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2636 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2637 case LangOptions::SOB_Defined:
2638 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2639 case LangOptions::SOB_Undefined:
2640 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2641 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2643 case LangOptions::SOB_Trapping:
2644 return EmitOverflowCheckedBinOp(op);
2648 if (op.Ty->isUnsignedIntegerType() &&
2649 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2650 return EmitOverflowCheckedBinOp(op);
2652 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2653 // Try to form an fmuladd.
2654 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2656 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
2659 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2662 // If the RHS is not a pointer, then we have normal pointer
2664 if (!op.RHS->getType()->isPointerTy())
2665 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2667 // Otherwise, this is a pointer subtraction.
2669 // Do the raw subtraction part.
2671 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2673 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2674 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2676 // Okay, figure out the element size.
2677 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2678 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2680 llvm::Value *divisor = nullptr;
2682 // For a variable-length array, this is going to be non-constant.
2683 if (const VariableArrayType *vla
2684 = CGF.getContext().getAsVariableArrayType(elementType)) {
2685 llvm::Value *numElements;
2686 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2688 divisor = numElements;
2690 // Scale the number of non-VLA elements by the non-VLA element size.
2691 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2692 if (!eltSize.isOne())
2693 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2695 // For everything elese, we can just compute it, safe in the
2696 // assumption that Sema won't let anything through that we can't
2697 // safely compute the size of.
2699 CharUnits elementSize;
2700 // Handle GCC extension for pointer arithmetic on void* and
2701 // function pointer types.
2702 if (elementType->isVoidType() || elementType->isFunctionType())
2703 elementSize = CharUnits::One();
2705 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2707 // Don't even emit the divide for element size of 1.
2708 if (elementSize.isOne())
2711 divisor = CGF.CGM.getSize(elementSize);
2714 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2715 // pointer difference in C is only defined in the case where both operands
2716 // are pointing to elements of an array.
2717 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2720 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2721 llvm::IntegerType *Ty;
2722 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2723 Ty = cast<llvm::IntegerType>(VT->getElementType());
2725 Ty = cast<llvm::IntegerType>(LHS->getType());
2726 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2729 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2730 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2731 // RHS to the same size as the LHS.
2732 Value *RHS = Ops.RHS;
2733 if (Ops.LHS->getType() != RHS->getType())
2734 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2736 bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
2737 Ops.Ty->hasSignedIntegerRepresentation();
2738 bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
2739 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2740 if (CGF.getLangOpts().OpenCL)
2742 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2743 else if ((SanitizeBase || SanitizeExponent) &&
2744 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2745 CodeGenFunction::SanitizerScope SanScope(&CGF);
2746 SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks;
2747 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
2748 llvm::Value *ValidExponent = Builder.CreateICmpULE(RHS, WidthMinusOne);
2750 if (SanitizeExponent) {
2752 std::make_pair(ValidExponent, SanitizerKind::ShiftExponent));
2756 // Check whether we are shifting any non-zero bits off the top of the
2757 // integer. We only emit this check if exponent is valid - otherwise
2758 // instructions below will have undefined behavior themselves.
2759 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2760 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2761 llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
2762 Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
2763 CGF.EmitBlock(CheckShiftBase);
2764 llvm::Value *BitsShiftedOff =
2765 Builder.CreateLShr(Ops.LHS,
2766 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2767 /*NUW*/true, /*NSW*/true),
2769 if (CGF.getLangOpts().CPlusPlus) {
2770 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2771 // Under C++11's rules, shifting a 1 bit into the sign bit is
2772 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2773 // define signed left shifts, so we use the C99 and C++11 rules there).
2774 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2775 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2777 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2778 llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2779 CGF.EmitBlock(Cont);
2780 llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
2781 BaseCheck->addIncoming(Builder.getTrue(), Orig);
2782 BaseCheck->addIncoming(ValidBase, CheckShiftBase);
2783 Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase));
2786 assert(!Checks.empty());
2787 EmitBinOpCheck(Checks, Ops);
2790 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2793 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2794 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2795 // RHS to the same size as the LHS.
2796 Value *RHS = Ops.RHS;
2797 if (Ops.LHS->getType() != RHS->getType())
2798 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2800 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2801 if (CGF.getLangOpts().OpenCL)
2803 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2804 else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
2805 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2806 CodeGenFunction::SanitizerScope SanScope(&CGF);
2807 llvm::Value *Valid =
2808 Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS));
2809 EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops);
2812 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2813 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2814 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2817 enum IntrinsicType { VCMPEQ, VCMPGT };
2818 // return corresponding comparison intrinsic for given vector type
2819 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2820 BuiltinType::Kind ElemKind) {
2822 default: llvm_unreachable("unexpected element type");
2823 case BuiltinType::Char_U:
2824 case BuiltinType::UChar:
2825 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2826 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
2827 case BuiltinType::Char_S:
2828 case BuiltinType::SChar:
2829 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2830 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
2831 case BuiltinType::UShort:
2832 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2833 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
2834 case BuiltinType::Short:
2835 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2836 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
2837 case BuiltinType::UInt:
2838 case BuiltinType::ULong:
2839 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2840 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
2841 case BuiltinType::Int:
2842 case BuiltinType::Long:
2843 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2844 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
2845 case BuiltinType::Float:
2846 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2847 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
2851 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc,
2852 unsigned SICmpOpc, unsigned FCmpOpc) {
2853 TestAndClearIgnoreResultAssign();
2855 QualType LHSTy = E->getLHS()->getType();
2856 QualType RHSTy = E->getRHS()->getType();
2857 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
2858 assert(E->getOpcode() == BO_EQ ||
2859 E->getOpcode() == BO_NE);
2860 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2861 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
2862 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
2863 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
2864 } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
2865 Value *LHS = Visit(E->getLHS());
2866 Value *RHS = Visit(E->getRHS());
2868 // If AltiVec, the comparison results in a numeric type, so we use
2869 // intrinsics comparing vectors and giving 0 or 1 as a result
2870 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
2871 // constants for mapping CR6 register bits to predicate result
2872 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2874 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2876 // in several cases vector arguments order will be reversed
2877 Value *FirstVecArg = LHS,
2878 *SecondVecArg = RHS;
2880 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
2881 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
2882 BuiltinType::Kind ElementKind = BTy->getKind();
2884 switch(E->getOpcode()) {
2885 default: llvm_unreachable("is not a comparison operation");
2888 ID = GetIntrinsic(VCMPEQ, ElementKind);
2892 ID = GetIntrinsic(VCMPEQ, ElementKind);
2896 ID = GetIntrinsic(VCMPGT, ElementKind);
2897 std::swap(FirstVecArg, SecondVecArg);
2901 ID = GetIntrinsic(VCMPGT, ElementKind);
2904 if (ElementKind == BuiltinType::Float) {
2906 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2907 std::swap(FirstVecArg, SecondVecArg);
2911 ID = GetIntrinsic(VCMPGT, ElementKind);
2915 if (ElementKind == BuiltinType::Float) {
2917 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2921 ID = GetIntrinsic(VCMPGT, ElementKind);
2922 std::swap(FirstVecArg, SecondVecArg);
2927 Value *CR6Param = Builder.getInt32(CR6);
2928 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2929 Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
2930 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2933 if (LHS->getType()->isFPOrFPVectorTy()) {
2934 Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc,
2936 } else if (LHSTy->hasSignedIntegerRepresentation()) {
2937 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc,
2940 // Unsigned integers and pointers.
2941 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2945 // If this is a vector comparison, sign extend the result to the appropriate
2946 // vector integer type and return it (don't convert to bool).
2947 if (LHSTy->isVectorType())
2948 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2951 // Complex Comparison: can only be an equality comparison.
2952 CodeGenFunction::ComplexPairTy LHS, RHS;
2954 if (auto *CTy = LHSTy->getAs<ComplexType>()) {
2955 LHS = CGF.EmitComplexExpr(E->getLHS());
2956 CETy = CTy->getElementType();
2958 LHS.first = Visit(E->getLHS());
2959 LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
2962 if (auto *CTy = RHSTy->getAs<ComplexType>()) {
2963 RHS = CGF.EmitComplexExpr(E->getRHS());
2964 assert(CGF.getContext().hasSameUnqualifiedType(CETy,
2965 CTy->getElementType()) &&
2966 "The element types must always match.");
2969 RHS.first = Visit(E->getRHS());
2970 RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
2971 assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
2972 "The element types must always match.");
2975 Value *ResultR, *ResultI;
2976 if (CETy->isRealFloatingType()) {
2977 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2978 LHS.first, RHS.first, "cmp.r");
2979 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2980 LHS.second, RHS.second, "cmp.i");
2982 // Complex comparisons can only be equality comparisons. As such, signed
2983 // and unsigned opcodes are the same.
2984 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2985 LHS.first, RHS.first, "cmp.r");
2986 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2987 LHS.second, RHS.second, "cmp.i");
2990 if (E->getOpcode() == BO_EQ) {
2991 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2993 assert(E->getOpcode() == BO_NE &&
2994 "Complex comparison other than == or != ?");
2995 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2999 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
3002 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
3003 bool Ignore = TestAndClearIgnoreResultAssign();
3008 switch (E->getLHS()->getType().getObjCLifetime()) {
3009 case Qualifiers::OCL_Strong:
3010 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
3013 case Qualifiers::OCL_Autoreleasing:
3014 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
3017 case Qualifiers::OCL_Weak:
3018 RHS = Visit(E->getRHS());
3019 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3020 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
3023 // No reason to do any of these differently.
3024 case Qualifiers::OCL_None:
3025 case Qualifiers::OCL_ExplicitNone:
3026 // __block variables need to have the rhs evaluated first, plus
3027 // this should improve codegen just a little.
3028 RHS = Visit(E->getRHS());
3029 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3031 // Store the value into the LHS. Bit-fields are handled specially
3032 // because the result is altered by the store, i.e., [C99 6.5.16p1]
3033 // 'An assignment expression has the value of the left operand after
3034 // the assignment...'.
3035 if (LHS.isBitField())
3036 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
3038 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
3041 // If the result is clearly ignored, return now.
3045 // The result of an assignment in C is the assigned r-value.
3046 if (!CGF.getLangOpts().CPlusPlus)
3049 // If the lvalue is non-volatile, return the computed value of the assignment.
3050 if (!LHS.isVolatileQualified())
3053 // Otherwise, reload the value.
3054 return EmitLoadOfLValue(LHS, E->getExprLoc());
3057 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
3058 // Perform vector logical and on comparisons with zero vectors.
3059 if (E->getType()->isVectorType()) {
3060 CGF.incrementProfileCounter(E);
3062 Value *LHS = Visit(E->getLHS());
3063 Value *RHS = Visit(E->getRHS());
3064 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3065 if (LHS->getType()->isFPOrFPVectorTy()) {
3066 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3067 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3069 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3070 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3072 Value *And = Builder.CreateAnd(LHS, RHS);
3073 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
3076 llvm::Type *ResTy = ConvertType(E->getType());
3078 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
3079 // If we have 1 && X, just emit X without inserting the control flow.
3081 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3082 if (LHSCondVal) { // If we have 1 && X, just emit X.
3083 CGF.incrementProfileCounter(E);
3085 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3086 // ZExt result to int or bool.
3087 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
3090 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
3091 if (!CGF.ContainsLabel(E->getRHS()))
3092 return llvm::Constant::getNullValue(ResTy);
3095 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
3096 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
3098 CodeGenFunction::ConditionalEvaluation eval(CGF);
3100 // Branch on the LHS first. If it is false, go to the failure (cont) block.
3101 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock,
3102 CGF.getProfileCount(E->getRHS()));
3104 // Any edges into the ContBlock are now from an (indeterminate number of)
3105 // edges from this first condition. All of these values will be false. Start
3106 // setting up the PHI node in the Cont Block for this.
3107 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3109 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3111 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
3114 CGF.EmitBlock(RHSBlock);
3115 CGF.incrementProfileCounter(E);
3116 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3119 // Reaquire the RHS block, as there may be subblocks inserted.
3120 RHSBlock = Builder.GetInsertBlock();
3122 // Emit an unconditional branch from this block to ContBlock.
3124 // There is no need to emit line number for unconditional branch.
3125 auto NL = ApplyDebugLocation::CreateEmpty(CGF);
3126 CGF.EmitBlock(ContBlock);
3128 // Insert an entry into the phi node for the edge with the value of RHSCond.
3129 PN->addIncoming(RHSCond, RHSBlock);
3131 // ZExt result to int.
3132 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
3135 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
3136 // Perform vector logical or on comparisons with zero vectors.
3137 if (E->getType()->isVectorType()) {
3138 CGF.incrementProfileCounter(E);
3140 Value *LHS = Visit(E->getLHS());
3141 Value *RHS = Visit(E->getRHS());
3142 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3143 if (LHS->getType()->isFPOrFPVectorTy()) {
3144 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3145 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3147 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3148 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3150 Value *Or = Builder.CreateOr(LHS, RHS);
3151 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
3154 llvm::Type *ResTy = ConvertType(E->getType());
3156 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
3157 // If we have 0 || X, just emit X without inserting the control flow.
3159 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3160 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3161 CGF.incrementProfileCounter(E);
3163 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3164 // ZExt result to int or bool.
3165 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3168 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3169 if (!CGF.ContainsLabel(E->getRHS()))
3170 return llvm::ConstantInt::get(ResTy, 1);
3173 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3174 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3176 CodeGenFunction::ConditionalEvaluation eval(CGF);
3178 // Branch on the LHS first. If it is true, go to the success (cont) block.
3179 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3180 CGF.getCurrentProfileCount() -
3181 CGF.getProfileCount(E->getRHS()));
3183 // Any edges into the ContBlock are now from an (indeterminate number of)
3184 // edges from this first condition. All of these values will be true. Start
3185 // setting up the PHI node in the Cont Block for this.
3186 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3188 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3190 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3194 // Emit the RHS condition as a bool value.
3195 CGF.EmitBlock(RHSBlock);
3196 CGF.incrementProfileCounter(E);
3197 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3201 // Reaquire the RHS block, as there may be subblocks inserted.
3202 RHSBlock = Builder.GetInsertBlock();
3204 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3205 // into the phi node for the edge with the value of RHSCond.
3206 CGF.EmitBlock(ContBlock);
3207 PN->addIncoming(RHSCond, RHSBlock);
3209 // ZExt result to int.
3210 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3213 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3214 CGF.EmitIgnoredExpr(E->getLHS());
3215 CGF.EnsureInsertPoint();
3216 return Visit(E->getRHS());
3219 //===----------------------------------------------------------------------===//
3221 //===----------------------------------------------------------------------===//
3223 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3224 /// expression is cheap enough and side-effect-free enough to evaluate
3225 /// unconditionally instead of conditionally. This is used to convert control
3226 /// flow into selects in some cases.
3227 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3228 CodeGenFunction &CGF) {
3229 // Anything that is an integer or floating point constant is fine.
3230 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3232 // Even non-volatile automatic variables can't be evaluated unconditionally.
3233 // Referencing a thread_local may cause non-trivial initialization work to
3234 // occur. If we're inside a lambda and one of the variables is from the scope
3235 // outside the lambda, that function may have returned already. Reading its
3236 // locals is a bad idea. Also, these reads may introduce races there didn't
3237 // exist in the source-level program.
3241 Value *ScalarExprEmitter::
3242 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3243 TestAndClearIgnoreResultAssign();
3245 // Bind the common expression if necessary.
3246 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3248 Expr *condExpr = E->getCond();
3249 Expr *lhsExpr = E->getTrueExpr();
3250 Expr *rhsExpr = E->getFalseExpr();
3252 // If the condition constant folds and can be elided, try to avoid emitting
3253 // the condition and the dead arm.
3255 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3256 Expr *live = lhsExpr, *dead = rhsExpr;
3257 if (!CondExprBool) std::swap(live, dead);
3259 // If the dead side doesn't have labels we need, just emit the Live part.
3260 if (!CGF.ContainsLabel(dead)) {
3262 CGF.incrementProfileCounter(E);
3263 Value *Result = Visit(live);
3265 // If the live part is a throw expression, it acts like it has a void
3266 // type, so evaluating it returns a null Value*. However, a conditional
3267 // with non-void type must return a non-null Value*.
3268 if (!Result && !E->getType()->isVoidType())
3269 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3275 // OpenCL: If the condition is a vector, we can treat this condition like
3276 // the select function.
3277 if (CGF.getLangOpts().OpenCL
3278 && condExpr->getType()->isVectorType()) {
3279 CGF.incrementProfileCounter(E);
3281 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3282 llvm::Value *LHS = Visit(lhsExpr);
3283 llvm::Value *RHS = Visit(rhsExpr);
3285 llvm::Type *condType = ConvertType(condExpr->getType());
3286 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3288 unsigned numElem = vecTy->getNumElements();
3289 llvm::Type *elemType = vecTy->getElementType();
3291 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3292 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3293 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3294 llvm::VectorType::get(elemType,
3297 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3299 // Cast float to int to perform ANDs if necessary.
3300 llvm::Value *RHSTmp = RHS;
3301 llvm::Value *LHSTmp = LHS;
3302 bool wasCast = false;
3303 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3304 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3305 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3306 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3310 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3311 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3312 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3314 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3319 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3320 // select instead of as control flow. We can only do this if it is cheap and
3321 // safe to evaluate the LHS and RHS unconditionally.
3322 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3323 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3324 CGF.incrementProfileCounter(E);
3326 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3327 llvm::Value *LHS = Visit(lhsExpr);
3328 llvm::Value *RHS = Visit(rhsExpr);
3330 // If the conditional has void type, make sure we return a null Value*.
3331 assert(!RHS && "LHS and RHS types must match");
3334 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3337 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3338 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3339 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3341 CodeGenFunction::ConditionalEvaluation eval(CGF);
3342 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
3343 CGF.getProfileCount(lhsExpr));
3345 CGF.EmitBlock(LHSBlock);
3346 CGF.incrementProfileCounter(E);
3348 Value *LHS = Visit(lhsExpr);
3351 LHSBlock = Builder.GetInsertBlock();
3352 Builder.CreateBr(ContBlock);
3354 CGF.EmitBlock(RHSBlock);
3356 Value *RHS = Visit(rhsExpr);
3359 RHSBlock = Builder.GetInsertBlock();
3360 CGF.EmitBlock(ContBlock);
3362 // If the LHS or RHS is a throw expression, it will be legitimately null.
3368 // Create a PHI node for the real part.
3369 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3370 PN->addIncoming(LHS, LHSBlock);
3371 PN->addIncoming(RHS, RHSBlock);
3375 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3376 return Visit(E->getChosenSubExpr());
3379 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3380 QualType Ty = VE->getType();
3382 if (Ty->isVariablyModifiedType())
3383 CGF.EmitVariablyModifiedType(Ty);
3385 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
3386 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
3387 llvm::Type *ArgTy = ConvertType(VE->getType());
3389 // If EmitVAArg fails, we fall back to the LLVM instruction.
3391 return Builder.CreateVAArg(ArgValue, ArgTy);
3393 // FIXME Volatility.
3394 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3396 // If EmitVAArg promoted the type, we must truncate it.
3397 if (ArgTy != Val->getType()) {
3398 if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy())
3399 Val = Builder.CreateIntToPtr(Val, ArgTy);
3401 Val = Builder.CreateTrunc(Val, ArgTy);
3407 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3408 return CGF.EmitBlockLiteral(block);
3411 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3412 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3413 llvm::Type *DstTy = ConvertType(E->getType());
3415 // Going from vec4->vec3 or vec3->vec4 is a special case and requires
3416 // a shuffle vector instead of a bitcast.
3417 llvm::Type *SrcTy = Src->getType();
3418 if (isa<llvm::VectorType>(DstTy) && isa<llvm::VectorType>(SrcTy)) {
3419 unsigned numElementsDst = cast<llvm::VectorType>(DstTy)->getNumElements();
3420 unsigned numElementsSrc = cast<llvm::VectorType>(SrcTy)->getNumElements();
3421 if ((numElementsDst == 3 && numElementsSrc == 4)
3422 || (numElementsDst == 4 && numElementsSrc == 3)) {
3425 // In the case of going from int4->float3, a bitcast is needed before
3427 llvm::Type *srcElemTy =
3428 cast<llvm::VectorType>(SrcTy)->getElementType();
3429 llvm::Type *dstElemTy =
3430 cast<llvm::VectorType>(DstTy)->getElementType();
3432 if ((srcElemTy->isIntegerTy() && dstElemTy->isFloatTy())
3433 || (srcElemTy->isFloatTy() && dstElemTy->isIntegerTy())) {
3434 // Create a float type of the same size as the source or destination.
3435 llvm::VectorType *newSrcTy = llvm::VectorType::get(dstElemTy,
3438 Src = Builder.CreateBitCast(Src, newSrcTy, "astypeCast");
3441 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3443 SmallVector<llvm::Constant*, 3> Args;
3444 Args.push_back(Builder.getInt32(0));
3445 Args.push_back(Builder.getInt32(1));
3446 Args.push_back(Builder.getInt32(2));
3448 if (numElementsDst == 4)
3449 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3451 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3453 return Builder.CreateShuffleVector(Src, UnV, Mask, "astype");
3457 return Builder.CreateBitCast(Src, DstTy, "astype");
3460 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3461 return CGF.EmitAtomicExpr(E).getScalarVal();
3464 //===----------------------------------------------------------------------===//
3465 // Entry Point into this File
3466 //===----------------------------------------------------------------------===//
3468 /// EmitScalarExpr - Emit the computation of the specified expression of scalar
3469 /// type, ignoring the result.
3470 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3471 assert(E && hasScalarEvaluationKind(E->getType()) &&
3472 "Invalid scalar expression to emit");
3474 return ScalarExprEmitter(*this, IgnoreResultAssign)
3475 .Visit(const_cast<Expr *>(E));
3478 /// EmitScalarConversion - Emit a conversion from the specified type to the
3479 /// specified destination type, both of which are LLVM scalar types.
3480 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3482 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3483 "Invalid scalar expression to emit");
3484 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy);
3487 /// EmitComplexToScalarConversion - Emit a conversion from the specified complex
3488 /// type to the specified destination type, where the destination type is an
3489 /// LLVM scalar type.
3490 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3493 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3494 "Invalid complex -> scalar conversion");
3495 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy,
3500 llvm::Value *CodeGenFunction::
3501 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3502 bool isInc, bool isPre) {
3503 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3506 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3508 // object->isa or (*object).isa
3509 // Generate code as for: *(Class*)object
3510 // build Class* type
3511 llvm::Type *ClassPtrTy = ConvertType(E->getType());
3513 Expr *BaseExpr = E->getBase();
3514 if (BaseExpr->isRValue()) {
3515 V = CreateMemTemp(E->getType(), "resval");
3516 llvm::Value *Src = EmitScalarExpr(BaseExpr);
3517 Builder.CreateStore(Src, V);
3518 V = ScalarExprEmitter(*this).EmitLoadOfLValue(
3519 MakeNaturalAlignAddrLValue(V, E->getType()), E->getExprLoc());
3522 V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr);
3524 V = EmitLValue(BaseExpr).getAddress();
3527 // build Class* type
3528 ClassPtrTy = ClassPtrTy->getPointerTo();
3529 V = Builder.CreateBitCast(V, ClassPtrTy);
3530 return MakeNaturalAlignAddrLValue(V, E->getType());
3534 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3535 const CompoundAssignOperator *E) {
3536 ScalarExprEmitter Scalar(*this);
3537 Value *Result = nullptr;
3538 switch (E->getOpcode()) {
3539 #define COMPOUND_OP(Op) \
3540 case BO_##Op##Assign: \
3541 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3577 llvm_unreachable("Not valid compound assignment operators");
3580 llvm_unreachable("Unhandled compound assignment operator");