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"
15 #include "CGCleanup.h"
17 #include "CGDebugInfo.h"
18 #include "CGObjCRuntime.h"
19 #include "CodeGenModule.h"
20 #include "TargetInfo.h"
21 #include "clang/AST/ASTContext.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/Expr.h"
24 #include "clang/AST/RecordLayout.h"
25 #include "clang/AST/StmtVisitor.h"
26 #include "clang/Basic/TargetInfo.h"
27 #include "clang/Frontend/CodeGenOptions.h"
28 #include "llvm/ADT/Optional.h"
29 #include "llvm/IR/CFG.h"
30 #include "llvm/IR/Constants.h"
31 #include "llvm/IR/DataLayout.h"
32 #include "llvm/IR/Function.h"
33 #include "llvm/IR/GlobalVariable.h"
34 #include "llvm/IR/Intrinsics.h"
35 #include "llvm/IR/Module.h"
38 using namespace clang;
39 using namespace CodeGen;
42 //===----------------------------------------------------------------------===//
43 // Scalar Expression Emitter
44 //===----------------------------------------------------------------------===//
50 QualType Ty; // Computation Type.
51 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
53 const Expr *E; // Entire expr, for error unsupported. May not be binop.
55 /// Check if the binop can result in integer overflow.
56 bool mayHaveIntegerOverflow() const {
57 // Without constant input, we can't rule out overflow.
58 const auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS);
59 const auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS);
63 // Assume overflow is possible, unless we can prove otherwise.
65 const auto &LHSAP = LHSCI->getValue();
66 const auto &RHSAP = RHSCI->getValue();
67 if (Opcode == BO_Add) {
68 if (Ty->hasSignedIntegerRepresentation())
69 (void)LHSAP.sadd_ov(RHSAP, Overflow);
71 (void)LHSAP.uadd_ov(RHSAP, Overflow);
72 } else if (Opcode == BO_Sub) {
73 if (Ty->hasSignedIntegerRepresentation())
74 (void)LHSAP.ssub_ov(RHSAP, Overflow);
76 (void)LHSAP.usub_ov(RHSAP, Overflow);
77 } else if (Opcode == BO_Mul) {
78 if (Ty->hasSignedIntegerRepresentation())
79 (void)LHSAP.smul_ov(RHSAP, Overflow);
81 (void)LHSAP.umul_ov(RHSAP, Overflow);
82 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
83 if (Ty->hasSignedIntegerRepresentation() && !RHSCI->isZero())
84 (void)LHSAP.sdiv_ov(RHSAP, Overflow);
91 /// Check if the binop computes a division or a remainder.
92 bool isDivisionLikeOperation() const {
93 return Opcode == BO_Div || Opcode == BO_Rem || Opcode == BO_DivAssign ||
94 Opcode == BO_RemAssign;
97 /// Check if the binop can result in an integer division by zero.
98 bool mayHaveIntegerDivisionByZero() const {
99 if (isDivisionLikeOperation())
100 if (auto *CI = dyn_cast<llvm::ConstantInt>(RHS))
105 /// Check if the binop can result in a float division by zero.
106 bool mayHaveFloatDivisionByZero() const {
107 if (isDivisionLikeOperation())
108 if (auto *CFP = dyn_cast<llvm::ConstantFP>(RHS))
109 return CFP->isZero();
114 static bool MustVisitNullValue(const Expr *E) {
115 // If a null pointer expression's type is the C++0x nullptr_t, then
116 // it's not necessarily a simple constant and it must be evaluated
117 // for its potential side effects.
118 return E->getType()->isNullPtrType();
121 /// If \p E is a widened promoted integer, get its base (unpromoted) type.
122 static llvm::Optional<QualType> getUnwidenedIntegerType(const ASTContext &Ctx,
124 const Expr *Base = E->IgnoreImpCasts();
128 QualType BaseTy = Base->getType();
129 if (!BaseTy->isPromotableIntegerType() ||
130 Ctx.getTypeSize(BaseTy) >= Ctx.getTypeSize(E->getType()))
136 /// Check if \p E is a widened promoted integer.
137 static bool IsWidenedIntegerOp(const ASTContext &Ctx, const Expr *E) {
138 return getUnwidenedIntegerType(Ctx, E).hasValue();
141 /// Check if we can skip the overflow check for \p Op.
142 static bool CanElideOverflowCheck(const ASTContext &Ctx, const BinOpInfo &Op) {
143 assert((isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) &&
144 "Expected a unary or binary operator");
146 // If the binop has constant inputs and we can prove there is no overflow,
147 // we can elide the overflow check.
148 if (!Op.mayHaveIntegerOverflow())
151 // If a unary op has a widened operand, the op cannot overflow.
152 if (const auto *UO = dyn_cast<UnaryOperator>(Op.E))
153 return IsWidenedIntegerOp(Ctx, UO->getSubExpr());
155 // We usually don't need overflow checks for binops with widened operands.
156 // Multiplication with promoted unsigned operands is a special case.
157 const auto *BO = cast<BinaryOperator>(Op.E);
158 auto OptionalLHSTy = getUnwidenedIntegerType(Ctx, BO->getLHS());
162 auto OptionalRHSTy = getUnwidenedIntegerType(Ctx, BO->getRHS());
166 QualType LHSTy = *OptionalLHSTy;
167 QualType RHSTy = *OptionalRHSTy;
169 // This is the simple case: binops without unsigned multiplication, and with
170 // widened operands. No overflow check is needed here.
171 if ((Op.Opcode != BO_Mul && Op.Opcode != BO_MulAssign) ||
172 !LHSTy->isUnsignedIntegerType() || !RHSTy->isUnsignedIntegerType())
175 // For unsigned multiplication the overflow check can be elided if either one
176 // of the unpromoted types are less than half the size of the promoted type.
177 unsigned PromotedSize = Ctx.getTypeSize(Op.E->getType());
178 return (2 * Ctx.getTypeSize(LHSTy)) < PromotedSize ||
179 (2 * Ctx.getTypeSize(RHSTy)) < PromotedSize;
182 /// Update the FastMathFlags of LLVM IR from the FPOptions in LangOptions.
183 static void updateFastMathFlags(llvm::FastMathFlags &FMF,
184 FPOptions FPFeatures) {
185 FMF.setAllowContract(FPFeatures.allowFPContractAcrossStatement());
188 /// Propagate fast-math flags from \p Op to the instruction in \p V.
189 static Value *propagateFMFlags(Value *V, const BinOpInfo &Op) {
190 if (auto *I = dyn_cast<llvm::Instruction>(V)) {
191 llvm::FastMathFlags FMF = I->getFastMathFlags();
192 updateFastMathFlags(FMF, Op.FPFeatures);
193 I->setFastMathFlags(FMF);
198 class ScalarExprEmitter
199 : public StmtVisitor<ScalarExprEmitter, Value*> {
200 CodeGenFunction &CGF;
201 CGBuilderTy &Builder;
202 bool IgnoreResultAssign;
203 llvm::LLVMContext &VMContext;
206 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
207 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
208 VMContext(cgf.getLLVMContext()) {
211 //===--------------------------------------------------------------------===//
213 //===--------------------------------------------------------------------===//
215 bool TestAndClearIgnoreResultAssign() {
216 bool I = IgnoreResultAssign;
217 IgnoreResultAssign = false;
221 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
222 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
223 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
224 return CGF.EmitCheckedLValue(E, TCK);
227 void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks,
228 const BinOpInfo &Info);
230 Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
231 return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
234 void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
235 const AlignValueAttr *AVAttr = nullptr;
236 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
237 const ValueDecl *VD = DRE->getDecl();
239 if (VD->getType()->isReferenceType()) {
240 if (const auto *TTy =
241 dyn_cast<TypedefType>(VD->getType().getNonReferenceType()))
242 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
244 // Assumptions for function parameters are emitted at the start of the
245 // function, so there is no need to repeat that here.
246 if (isa<ParmVarDecl>(VD))
249 AVAttr = VD->getAttr<AlignValueAttr>();
254 if (const auto *TTy =
255 dyn_cast<TypedefType>(E->getType()))
256 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
261 Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
262 llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
263 CGF.EmitAlignmentAssumption(V, AlignmentCI->getZExtValue());
266 /// EmitLoadOfLValue - Given an expression with complex type that represents a
267 /// value l-value, this method emits the address of the l-value, then loads
268 /// and returns the result.
269 Value *EmitLoadOfLValue(const Expr *E) {
270 Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
273 EmitLValueAlignmentAssumption(E, V);
277 /// EmitConversionToBool - Convert the specified expression value to a
278 /// boolean (i1) truth value. This is equivalent to "Val != 0".
279 Value *EmitConversionToBool(Value *Src, QualType DstTy);
281 /// Emit a check that a conversion to or from a floating-point type does not
283 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
284 Value *Src, QualType SrcType, QualType DstType,
285 llvm::Type *DstTy, SourceLocation Loc);
287 /// Emit a conversion from the specified type to the specified destination
288 /// type, both of which are LLVM scalar types.
289 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
292 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
293 SourceLocation Loc, bool TreatBooleanAsSigned);
295 /// Emit a conversion from the specified complex type to the specified
296 /// destination type, where the destination type is an LLVM scalar type.
297 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
298 QualType SrcTy, QualType DstTy,
301 /// EmitNullValue - Emit a value that corresponds to null for the given type.
302 Value *EmitNullValue(QualType Ty);
304 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
305 Value *EmitFloatToBoolConversion(Value *V) {
306 // Compare against 0.0 for fp scalars.
307 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
308 return Builder.CreateFCmpUNE(V, Zero, "tobool");
311 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
312 Value *EmitPointerToBoolConversion(Value *V, QualType QT) {
313 Value *Zero = CGF.CGM.getNullPointer(cast<llvm::PointerType>(V->getType()), QT);
315 return Builder.CreateICmpNE(V, Zero, "tobool");
318 Value *EmitIntToBoolConversion(Value *V) {
319 // Because of the type rules of C, we often end up computing a
320 // logical value, then zero extending it to int, then wanting it
321 // as a logical value again. Optimize this common case.
322 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
323 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
324 Value *Result = ZI->getOperand(0);
325 // If there aren't any more uses, zap the instruction to save space.
326 // Note that there can be more uses, for example if this
327 // is the result of an assignment.
329 ZI->eraseFromParent();
334 return Builder.CreateIsNotNull(V, "tobool");
337 //===--------------------------------------------------------------------===//
339 //===--------------------------------------------------------------------===//
341 Value *Visit(Expr *E) {
342 ApplyDebugLocation DL(CGF, E);
343 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
346 Value *VisitStmt(Stmt *S) {
347 S->dump(CGF.getContext().getSourceManager());
348 llvm_unreachable("Stmt can't have complex result type!");
350 Value *VisitExpr(Expr *S);
352 Value *VisitParenExpr(ParenExpr *PE) {
353 return Visit(PE->getSubExpr());
355 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
356 return Visit(E->getReplacement());
358 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
359 return Visit(GE->getResultExpr());
361 Value *VisitCoawaitExpr(CoawaitExpr *S) {
362 return CGF.EmitCoawaitExpr(*S).getScalarVal();
364 Value *VisitCoyieldExpr(CoyieldExpr *S) {
365 return CGF.EmitCoyieldExpr(*S).getScalarVal();
367 Value *VisitUnaryCoawait(const UnaryOperator *E) {
368 return Visit(E->getSubExpr());
372 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
373 return Builder.getInt(E->getValue());
375 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
376 return llvm::ConstantFP::get(VMContext, E->getValue());
378 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
379 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
381 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
382 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
384 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
385 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
387 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
388 return EmitNullValue(E->getType());
390 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
391 return EmitNullValue(E->getType());
393 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
394 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
395 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
396 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
397 return Builder.CreateBitCast(V, ConvertType(E->getType()));
400 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
401 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
404 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
405 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
408 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
410 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E), E->getExprLoc());
412 // Otherwise, assume the mapping is the scalar directly.
413 return CGF.getOpaqueRValueMapping(E).getScalarVal();
417 Value *VisitDeclRefExpr(DeclRefExpr *E) {
418 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
419 if (result.isReference())
420 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E),
422 return result.getValue();
424 return EmitLoadOfLValue(E);
427 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
428 return CGF.EmitObjCSelectorExpr(E);
430 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
431 return CGF.EmitObjCProtocolExpr(E);
433 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
434 return EmitLoadOfLValue(E);
436 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
437 if (E->getMethodDecl() &&
438 E->getMethodDecl()->getReturnType()->isReferenceType())
439 return EmitLoadOfLValue(E);
440 return CGF.EmitObjCMessageExpr(E).getScalarVal();
443 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
444 LValue LV = CGF.EmitObjCIsaExpr(E);
445 Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
449 Value *VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) {
450 VersionTuple Version = E->getVersion();
452 // If we're checking for a platform older than our minimum deployment
453 // target, we can fold the check away.
454 if (Version <= CGF.CGM.getTarget().getPlatformMinVersion())
455 return llvm::ConstantInt::get(Builder.getInt1Ty(), 1);
457 Optional<unsigned> Min = Version.getMinor(), SMin = Version.getSubminor();
458 llvm::Value *Args[] = {
459 llvm::ConstantInt::get(CGF.CGM.Int32Ty, Version.getMajor()),
460 llvm::ConstantInt::get(CGF.CGM.Int32Ty, Min ? *Min : 0),
461 llvm::ConstantInt::get(CGF.CGM.Int32Ty, SMin ? *SMin : 0),
464 return CGF.EmitBuiltinAvailable(Args);
467 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
468 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
469 Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
470 Value *VisitMemberExpr(MemberExpr *E);
471 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
472 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
473 return EmitLoadOfLValue(E);
476 Value *VisitInitListExpr(InitListExpr *E);
478 Value *VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) {
479 assert(CGF.getArrayInitIndex() &&
480 "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?");
481 return CGF.getArrayInitIndex();
484 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
485 return EmitNullValue(E->getType());
487 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
488 CGF.CGM.EmitExplicitCastExprType(E, &CGF);
489 return VisitCastExpr(E);
491 Value *VisitCastExpr(CastExpr *E);
493 Value *VisitCallExpr(const CallExpr *E) {
494 if (E->getCallReturnType(CGF.getContext())->isReferenceType())
495 return EmitLoadOfLValue(E);
497 Value *V = CGF.EmitCallExpr(E).getScalarVal();
499 EmitLValueAlignmentAssumption(E, V);
503 Value *VisitStmtExpr(const StmtExpr *E);
506 Value *VisitUnaryPostDec(const UnaryOperator *E) {
507 LValue LV = EmitLValue(E->getSubExpr());
508 return EmitScalarPrePostIncDec(E, LV, false, false);
510 Value *VisitUnaryPostInc(const UnaryOperator *E) {
511 LValue LV = EmitLValue(E->getSubExpr());
512 return EmitScalarPrePostIncDec(E, LV, true, false);
514 Value *VisitUnaryPreDec(const UnaryOperator *E) {
515 LValue LV = EmitLValue(E->getSubExpr());
516 return EmitScalarPrePostIncDec(E, LV, false, true);
518 Value *VisitUnaryPreInc(const UnaryOperator *E) {
519 LValue LV = EmitLValue(E->getSubExpr());
520 return EmitScalarPrePostIncDec(E, LV, true, true);
523 llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E,
527 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
528 bool isInc, bool isPre);
531 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
532 if (isa<MemberPointerType>(E->getType())) // never sugared
533 return CGF.CGM.getMemberPointerConstant(E);
535 return EmitLValue(E->getSubExpr()).getPointer();
537 Value *VisitUnaryDeref(const UnaryOperator *E) {
538 if (E->getType()->isVoidType())
539 return Visit(E->getSubExpr()); // the actual value should be unused
540 return EmitLoadOfLValue(E);
542 Value *VisitUnaryPlus(const UnaryOperator *E) {
543 // This differs from gcc, though, most likely due to a bug in gcc.
544 TestAndClearIgnoreResultAssign();
545 return Visit(E->getSubExpr());
547 Value *VisitUnaryMinus (const UnaryOperator *E);
548 Value *VisitUnaryNot (const UnaryOperator *E);
549 Value *VisitUnaryLNot (const UnaryOperator *E);
550 Value *VisitUnaryReal (const UnaryOperator *E);
551 Value *VisitUnaryImag (const UnaryOperator *E);
552 Value *VisitUnaryExtension(const UnaryOperator *E) {
553 return Visit(E->getSubExpr());
557 Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
558 return EmitLoadOfLValue(E);
561 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
562 return Visit(DAE->getExpr());
564 Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
565 CodeGenFunction::CXXDefaultInitExprScope Scope(CGF);
566 return Visit(DIE->getExpr());
568 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
569 return CGF.LoadCXXThis();
572 Value *VisitExprWithCleanups(ExprWithCleanups *E);
573 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
574 return CGF.EmitCXXNewExpr(E);
576 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
577 CGF.EmitCXXDeleteExpr(E);
581 Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
582 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
585 Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
586 return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue());
589 Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
590 return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
593 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
594 // C++ [expr.pseudo]p1:
595 // The result shall only be used as the operand for the function call
596 // operator (), and the result of such a call has type void. The only
597 // effect is the evaluation of the postfix-expression before the dot or
599 CGF.EmitScalarExpr(E->getBase());
603 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
604 return EmitNullValue(E->getType());
607 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
608 CGF.EmitCXXThrowExpr(E);
612 Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
613 return Builder.getInt1(E->getValue());
617 Value *EmitMul(const BinOpInfo &Ops) {
618 if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
619 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
620 case LangOptions::SOB_Defined:
621 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
622 case LangOptions::SOB_Undefined:
623 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
624 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
626 case LangOptions::SOB_Trapping:
627 if (CanElideOverflowCheck(CGF.getContext(), Ops))
628 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
629 return EmitOverflowCheckedBinOp(Ops);
633 if (Ops.Ty->isUnsignedIntegerType() &&
634 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) &&
635 !CanElideOverflowCheck(CGF.getContext(), Ops))
636 return EmitOverflowCheckedBinOp(Ops);
638 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
639 Value *V = Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
640 return propagateFMFlags(V, Ops);
642 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
644 /// Create a binary op that checks for overflow.
645 /// Currently only supports +, - and *.
646 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
648 // Check for undefined division and modulus behaviors.
649 void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
650 llvm::Value *Zero,bool isDiv);
651 // Common helper for getting how wide LHS of shift is.
652 static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS);
653 Value *EmitDiv(const BinOpInfo &Ops);
654 Value *EmitRem(const BinOpInfo &Ops);
655 Value *EmitAdd(const BinOpInfo &Ops);
656 Value *EmitSub(const BinOpInfo &Ops);
657 Value *EmitShl(const BinOpInfo &Ops);
658 Value *EmitShr(const BinOpInfo &Ops);
659 Value *EmitAnd(const BinOpInfo &Ops) {
660 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
662 Value *EmitXor(const BinOpInfo &Ops) {
663 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
665 Value *EmitOr (const BinOpInfo &Ops) {
666 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
669 BinOpInfo EmitBinOps(const BinaryOperator *E);
670 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
671 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
674 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
675 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
677 // Binary operators and binary compound assignment operators.
678 #define HANDLEBINOP(OP) \
679 Value *VisitBin ## OP(const BinaryOperator *E) { \
680 return Emit ## OP(EmitBinOps(E)); \
682 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
683 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
698 Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc,
699 llvm::CmpInst::Predicate SICmpOpc,
700 llvm::CmpInst::Predicate FCmpOpc);
701 #define VISITCOMP(CODE, UI, SI, FP) \
702 Value *VisitBin##CODE(const BinaryOperator *E) { \
703 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
704 llvm::FCmpInst::FP); }
705 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
706 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
707 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
708 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
709 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
710 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
713 Value *VisitBinAssign (const BinaryOperator *E);
715 Value *VisitBinLAnd (const BinaryOperator *E);
716 Value *VisitBinLOr (const BinaryOperator *E);
717 Value *VisitBinComma (const BinaryOperator *E);
719 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
720 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
723 Value *VisitBlockExpr(const BlockExpr *BE);
724 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
725 Value *VisitChooseExpr(ChooseExpr *CE);
726 Value *VisitVAArgExpr(VAArgExpr *VE);
727 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
728 return CGF.EmitObjCStringLiteral(E);
730 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
731 return CGF.EmitObjCBoxedExpr(E);
733 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
734 return CGF.EmitObjCArrayLiteral(E);
736 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
737 return CGF.EmitObjCDictionaryLiteral(E);
739 Value *VisitAsTypeExpr(AsTypeExpr *CE);
740 Value *VisitAtomicExpr(AtomicExpr *AE);
742 } // end anonymous namespace.
744 //===----------------------------------------------------------------------===//
746 //===----------------------------------------------------------------------===//
748 /// EmitConversionToBool - Convert the specified expression value to a
749 /// boolean (i1) truth value. This is equivalent to "Val != 0".
750 Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
751 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
753 if (SrcType->isRealFloatingType())
754 return EmitFloatToBoolConversion(Src);
756 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
757 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
759 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
760 "Unknown scalar type to convert");
762 if (isa<llvm::IntegerType>(Src->getType()))
763 return EmitIntToBoolConversion(Src);
765 assert(isa<llvm::PointerType>(Src->getType()));
766 return EmitPointerToBoolConversion(Src, SrcType);
769 void ScalarExprEmitter::EmitFloatConversionCheck(
770 Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType,
771 QualType DstType, llvm::Type *DstTy, SourceLocation Loc) {
772 CodeGenFunction::SanitizerScope SanScope(&CGF);
776 llvm::Type *SrcTy = Src->getType();
778 llvm::Value *Check = nullptr;
779 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
780 // Integer to floating-point. This can fail for unsigned short -> __half
781 // or unsigned __int128 -> float.
782 assert(DstType->isFloatingType());
783 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
785 APFloat LargestFloat =
786 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
787 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
790 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
791 &IsExact) != APFloat::opOK)
792 // The range of representable values of this floating point type includes
793 // all values of this integer type. Don't need an overflow check.
796 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
798 Check = Builder.CreateICmpULE(Src, Max);
800 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
801 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
802 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
803 Check = Builder.CreateAnd(GE, LE);
806 const llvm::fltSemantics &SrcSema =
807 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
808 if (isa<llvm::IntegerType>(DstTy)) {
809 // Floating-point to integer. This has undefined behavior if the source is
810 // +-Inf, NaN, or doesn't fit into the destination type (after truncation
812 unsigned Width = CGF.getContext().getIntWidth(DstType);
813 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
815 APSInt Min = APSInt::getMinValue(Width, Unsigned);
816 APFloat MinSrc(SrcSema, APFloat::uninitialized);
817 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
819 // Don't need an overflow check for lower bound. Just check for
821 MinSrc = APFloat::getInf(SrcSema, true);
823 // Find the largest value which is too small to represent (before
824 // truncation toward zero).
825 MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
827 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
828 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
829 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
831 // Don't need an overflow check for upper bound. Just check for
833 MaxSrc = APFloat::getInf(SrcSema, false);
835 // Find the smallest value which is too large to represent (before
836 // truncation toward zero).
837 MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
839 // If we're converting from __half, convert the range to float to match
841 if (OrigSrcType->isHalfType()) {
842 const llvm::fltSemantics &Sema =
843 CGF.getContext().getFloatTypeSemantics(SrcType);
845 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
846 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
850 Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
852 Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
853 Check = Builder.CreateAnd(GE, LE);
855 // FIXME: Maybe split this sanitizer out from float-cast-overflow.
857 // Floating-point to floating-point. This has undefined behavior if the
858 // source is not in the range of representable values of the destination
859 // type. The C and C++ standards are spectacularly unclear here. We
860 // diagnose finite out-of-range conversions, but allow infinities and NaNs
861 // to convert to the corresponding value in the smaller type.
863 // C11 Annex F gives all such conversions defined behavior for IEC 60559
864 // conforming implementations. Unfortunately, LLVM's fptrunc instruction
867 // Converting from a lower rank to a higher rank can never have
868 // undefined behavior, since higher-rank types must have a superset
869 // of values of lower-rank types.
870 if (CGF.getContext().getFloatingTypeOrder(OrigSrcType, DstType) != 1)
873 assert(!OrigSrcType->isHalfType() &&
874 "should not check conversion from __half, it has the lowest rank");
876 const llvm::fltSemantics &DstSema =
877 CGF.getContext().getFloatTypeSemantics(DstType);
878 APFloat MinBad = APFloat::getLargest(DstSema, false);
879 APFloat MaxBad = APFloat::getInf(DstSema, false);
882 MinBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
883 MaxBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
885 Value *AbsSrc = CGF.EmitNounwindRuntimeCall(
886 CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Src->getType()), Src);
888 Builder.CreateFCmpOGT(AbsSrc, llvm::ConstantFP::get(VMContext, MinBad));
890 Builder.CreateFCmpOLT(AbsSrc, llvm::ConstantFP::get(VMContext, MaxBad));
891 Check = Builder.CreateNot(Builder.CreateAnd(GE, LE));
895 llvm::Constant *StaticArgs[] = {CGF.EmitCheckSourceLocation(Loc),
896 CGF.EmitCheckTypeDescriptor(OrigSrcType),
897 CGF.EmitCheckTypeDescriptor(DstType)};
898 CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow),
899 SanitizerHandler::FloatCastOverflow, StaticArgs, OrigSrc);
902 /// Emit a conversion from the specified type to the specified destination type,
903 /// both of which are LLVM scalar types.
904 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
906 SourceLocation Loc) {
907 return EmitScalarConversion(Src, SrcType, DstType, Loc, false);
910 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
913 bool TreatBooleanAsSigned) {
914 SrcType = CGF.getContext().getCanonicalType(SrcType);
915 DstType = CGF.getContext().getCanonicalType(DstType);
916 if (SrcType == DstType) return Src;
918 if (DstType->isVoidType()) return nullptr;
920 llvm::Value *OrigSrc = Src;
921 QualType OrigSrcType = SrcType;
922 llvm::Type *SrcTy = Src->getType();
924 // Handle conversions to bool first, they are special: comparisons against 0.
925 if (DstType->isBooleanType())
926 return EmitConversionToBool(Src, SrcType);
928 llvm::Type *DstTy = ConvertType(DstType);
930 // Cast from half through float if half isn't a native type.
931 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
932 // Cast to FP using the intrinsic if the half type itself isn't supported.
933 if (DstTy->isFloatingPointTy()) {
934 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
935 return Builder.CreateCall(
936 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy),
939 // Cast to other types through float, using either the intrinsic or FPExt,
940 // depending on whether the half type itself is supported
941 // (as opposed to operations on half, available with NativeHalfType).
942 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
943 Src = Builder.CreateCall(
944 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
948 Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv");
950 SrcType = CGF.getContext().FloatTy;
955 // Ignore conversions like int -> uint.
959 // Handle pointer conversions next: pointers can only be converted to/from
960 // other pointers and integers. Check for pointer types in terms of LLVM, as
961 // some native types (like Obj-C id) may map to a pointer type.
962 if (auto DstPT = dyn_cast<llvm::PointerType>(DstTy)) {
963 // The source value may be an integer, or a pointer.
964 if (isa<llvm::PointerType>(SrcTy))
965 return Builder.CreateBitCast(Src, DstTy, "conv");
967 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
968 // First, convert to the correct width so that we control the kind of
970 llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DstPT);
971 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
972 llvm::Value* IntResult =
973 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
974 // Then, cast to pointer.
975 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
978 if (isa<llvm::PointerType>(SrcTy)) {
979 // Must be an ptr to int cast.
980 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
981 return Builder.CreatePtrToInt(Src, DstTy, "conv");
984 // A scalar can be splatted to an extended vector of the same element type
985 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
986 // Sema should add casts to make sure that the source expression's type is
987 // the same as the vector's element type (sans qualifiers)
988 assert(DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() ==
989 SrcType.getTypePtr() &&
990 "Splatted expr doesn't match with vector element type?");
992 // Splat the element across to all elements
993 unsigned NumElements = DstTy->getVectorNumElements();
994 return Builder.CreateVectorSplat(NumElements, Src, "splat");
997 // Allow bitcast from vector to integer/fp of the same size.
998 if (isa<llvm::VectorType>(SrcTy) ||
999 isa<llvm::VectorType>(DstTy))
1000 return Builder.CreateBitCast(Src, DstTy, "conv");
1002 // Finally, we have the arithmetic types: real int/float.
1003 Value *Res = nullptr;
1004 llvm::Type *ResTy = DstTy;
1006 // An overflowing conversion has undefined behavior if either the source type
1007 // or the destination type is a floating-point type.
1008 if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) &&
1009 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
1010 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType, DstTy,
1013 // Cast to half through float if half isn't a native type.
1014 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1015 // Make sure we cast in a single step if from another FP type.
1016 if (SrcTy->isFloatingPointTy()) {
1017 // Use the intrinsic if the half type itself isn't supported
1018 // (as opposed to operations on half, available with NativeHalfType).
1019 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
1020 return Builder.CreateCall(
1021 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src);
1022 // If the half type is supported, just use an fptrunc.
1023 return Builder.CreateFPTrunc(Src, DstTy);
1025 DstTy = CGF.FloatTy;
1028 if (isa<llvm::IntegerType>(SrcTy)) {
1029 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
1030 if (SrcType->isBooleanType() && TreatBooleanAsSigned) {
1033 if (isa<llvm::IntegerType>(DstTy))
1034 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1035 else if (InputSigned)
1036 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1038 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1039 } else if (isa<llvm::IntegerType>(DstTy)) {
1040 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
1041 if (DstType->isSignedIntegerOrEnumerationType())
1042 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1044 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1046 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
1047 "Unknown real conversion");
1048 if (DstTy->getTypeID() < SrcTy->getTypeID())
1049 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1051 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1054 if (DstTy != ResTy) {
1055 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1056 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
1057 Res = Builder.CreateCall(
1058 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy),
1061 Res = Builder.CreateFPTrunc(Res, ResTy, "conv");
1068 /// Emit a conversion from the specified complex type to the specified
1069 /// destination type, where the destination type is an LLVM scalar type.
1070 Value *ScalarExprEmitter::EmitComplexToScalarConversion(
1071 CodeGenFunction::ComplexPairTy Src, QualType SrcTy, QualType DstTy,
1072 SourceLocation Loc) {
1073 // Get the source element type.
1074 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
1076 // Handle conversions to bool first, they are special: comparisons against 0.
1077 if (DstTy->isBooleanType()) {
1078 // Complex != 0 -> (Real != 0) | (Imag != 0)
1079 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
1080 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy, Loc);
1081 return Builder.CreateOr(Src.first, Src.second, "tobool");
1084 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
1085 // the imaginary part of the complex value is discarded and the value of the
1086 // real part is converted according to the conversion rules for the
1087 // corresponding real type.
1088 return EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
1091 Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
1092 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
1095 /// \brief Emit a sanitization check for the given "binary" operation (which
1096 /// might actually be a unary increment which has been lowered to a binary
1097 /// operation). The check passes if all values in \p Checks (which are \c i1),
1099 void ScalarExprEmitter::EmitBinOpCheck(
1100 ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) {
1101 assert(CGF.IsSanitizerScope);
1102 SanitizerHandler Check;
1103 SmallVector<llvm::Constant *, 4> StaticData;
1104 SmallVector<llvm::Value *, 2> DynamicData;
1106 BinaryOperatorKind Opcode = Info.Opcode;
1107 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
1108 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
1110 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
1111 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
1112 if (UO && UO->getOpcode() == UO_Minus) {
1113 Check = SanitizerHandler::NegateOverflow;
1114 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
1115 DynamicData.push_back(Info.RHS);
1117 if (BinaryOperator::isShiftOp(Opcode)) {
1118 // Shift LHS negative or too large, or RHS out of bounds.
1119 Check = SanitizerHandler::ShiftOutOfBounds;
1120 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
1121 StaticData.push_back(
1122 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
1123 StaticData.push_back(
1124 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
1125 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
1126 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
1127 Check = SanitizerHandler::DivremOverflow;
1128 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
1130 // Arithmetic overflow (+, -, *).
1132 case BO_Add: Check = SanitizerHandler::AddOverflow; break;
1133 case BO_Sub: Check = SanitizerHandler::SubOverflow; break;
1134 case BO_Mul: Check = SanitizerHandler::MulOverflow; break;
1135 default: llvm_unreachable("unexpected opcode for bin op check");
1137 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
1139 DynamicData.push_back(Info.LHS);
1140 DynamicData.push_back(Info.RHS);
1143 CGF.EmitCheck(Checks, Check, StaticData, DynamicData);
1146 //===----------------------------------------------------------------------===//
1148 //===----------------------------------------------------------------------===//
1150 Value *ScalarExprEmitter::VisitExpr(Expr *E) {
1151 CGF.ErrorUnsupported(E, "scalar expression");
1152 if (E->getType()->isVoidType())
1154 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
1157 Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
1159 if (E->getNumSubExprs() == 2) {
1160 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
1161 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
1164 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
1165 unsigned LHSElts = LTy->getNumElements();
1169 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
1171 // Mask off the high bits of each shuffle index.
1173 llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1);
1174 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
1177 // mask = mask & maskbits
1179 // n = extract mask i
1180 // x = extract val n
1181 // newv = insert newv, x, i
1182 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
1183 MTy->getNumElements());
1184 Value* NewV = llvm::UndefValue::get(RTy);
1185 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
1186 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
1187 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
1189 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
1190 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
1195 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
1196 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
1198 SmallVector<llvm::Constant*, 32> indices;
1199 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
1200 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
1201 // Check for -1 and output it as undef in the IR.
1202 if (Idx.isSigned() && Idx.isAllOnesValue())
1203 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
1205 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
1208 Value *SV = llvm::ConstantVector::get(indices);
1209 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
1212 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
1213 QualType SrcType = E->getSrcExpr()->getType(),
1214 DstType = E->getType();
1216 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
1218 SrcType = CGF.getContext().getCanonicalType(SrcType);
1219 DstType = CGF.getContext().getCanonicalType(DstType);
1220 if (SrcType == DstType) return Src;
1222 assert(SrcType->isVectorType() &&
1223 "ConvertVector source type must be a vector");
1224 assert(DstType->isVectorType() &&
1225 "ConvertVector destination type must be a vector");
1227 llvm::Type *SrcTy = Src->getType();
1228 llvm::Type *DstTy = ConvertType(DstType);
1230 // Ignore conversions like int -> uint.
1234 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
1235 DstEltType = DstType->getAs<VectorType>()->getElementType();
1237 assert(SrcTy->isVectorTy() &&
1238 "ConvertVector source IR type must be a vector");
1239 assert(DstTy->isVectorTy() &&
1240 "ConvertVector destination IR type must be a vector");
1242 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1243 *DstEltTy = DstTy->getVectorElementType();
1245 if (DstEltType->isBooleanType()) {
1246 assert((SrcEltTy->isFloatingPointTy() ||
1247 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1249 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1250 if (SrcEltTy->isFloatingPointTy()) {
1251 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1253 return Builder.CreateICmpNE(Src, Zero, "tobool");
1257 // We have the arithmetic types: real int/float.
1258 Value *Res = nullptr;
1260 if (isa<llvm::IntegerType>(SrcEltTy)) {
1261 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1262 if (isa<llvm::IntegerType>(DstEltTy))
1263 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1264 else if (InputSigned)
1265 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1267 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1268 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1269 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1270 if (DstEltType->isSignedIntegerOrEnumerationType())
1271 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1273 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1275 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1276 "Unknown real conversion");
1277 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1278 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1280 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1286 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1288 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1290 CGF.EmitScalarExpr(E->getBase());
1292 EmitLValue(E->getBase());
1293 return Builder.getInt(Value);
1296 return EmitLoadOfLValue(E);
1299 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1300 TestAndClearIgnoreResultAssign();
1302 // Emit subscript expressions in rvalue context's. For most cases, this just
1303 // loads the lvalue formed by the subscript expr. However, we have to be
1304 // careful, because the base of a vector subscript is occasionally an rvalue,
1305 // so we can't get it as an lvalue.
1306 if (!E->getBase()->getType()->isVectorType())
1307 return EmitLoadOfLValue(E);
1309 // Handle the vector case. The base must be a vector, the index must be an
1311 Value *Base = Visit(E->getBase());
1312 Value *Idx = Visit(E->getIdx());
1313 QualType IdxTy = E->getIdx()->getType();
1315 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
1316 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1318 return Builder.CreateExtractElement(Base, Idx, "vecext");
1321 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1322 unsigned Off, llvm::Type *I32Ty) {
1323 int MV = SVI->getMaskValue(Idx);
1325 return llvm::UndefValue::get(I32Ty);
1326 return llvm::ConstantInt::get(I32Ty, Off+MV);
1329 static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) {
1330 if (C->getBitWidth() != 32) {
1331 assert(llvm::ConstantInt::isValueValidForType(I32Ty,
1332 C->getZExtValue()) &&
1333 "Index operand too large for shufflevector mask!");
1334 return llvm::ConstantInt::get(I32Ty, C->getZExtValue());
1339 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1340 bool Ignore = TestAndClearIgnoreResultAssign();
1342 assert (Ignore == false && "init list ignored");
1343 unsigned NumInitElements = E->getNumInits();
1345 if (E->hadArrayRangeDesignator())
1346 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1348 llvm::VectorType *VType =
1349 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1352 if (NumInitElements == 0) {
1353 // C++11 value-initialization for the scalar.
1354 return EmitNullValue(E->getType());
1356 // We have a scalar in braces. Just use the first element.
1357 return Visit(E->getInit(0));
1360 unsigned ResElts = VType->getNumElements();
1362 // Loop over initializers collecting the Value for each, and remembering
1363 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1364 // us to fold the shuffle for the swizzle into the shuffle for the vector
1365 // initializer, since LLVM optimizers generally do not want to touch
1367 unsigned CurIdx = 0;
1368 bool VIsUndefShuffle = false;
1369 llvm::Value *V = llvm::UndefValue::get(VType);
1370 for (unsigned i = 0; i != NumInitElements; ++i) {
1371 Expr *IE = E->getInit(i);
1372 Value *Init = Visit(IE);
1373 SmallVector<llvm::Constant*, 16> Args;
1375 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1377 // Handle scalar elements. If the scalar initializer is actually one
1378 // element of a different vector of the same width, use shuffle instead of
1381 if (isa<ExtVectorElementExpr>(IE)) {
1382 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1384 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1385 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1386 Value *LHS = nullptr, *RHS = nullptr;
1388 // insert into undef -> shuffle (src, undef)
1389 // shufflemask must use an i32
1390 Args.push_back(getAsInt32(C, CGF.Int32Ty));
1391 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1393 LHS = EI->getVectorOperand();
1395 VIsUndefShuffle = true;
1396 } else if (VIsUndefShuffle) {
1397 // insert into undefshuffle && size match -> shuffle (v, src)
1398 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1399 for (unsigned j = 0; j != CurIdx; ++j)
1400 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1401 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1402 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1404 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1405 RHS = EI->getVectorOperand();
1406 VIsUndefShuffle = false;
1408 if (!Args.empty()) {
1409 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1410 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1416 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1418 VIsUndefShuffle = false;
1423 unsigned InitElts = VVT->getNumElements();
1425 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1426 // input is the same width as the vector being constructed, generate an
1427 // optimized shuffle of the swizzle input into the result.
1428 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1429 if (isa<ExtVectorElementExpr>(IE)) {
1430 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1431 Value *SVOp = SVI->getOperand(0);
1432 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1434 if (OpTy->getNumElements() == ResElts) {
1435 for (unsigned j = 0; j != CurIdx; ++j) {
1436 // If the current vector initializer is a shuffle with undef, merge
1437 // this shuffle directly into it.
1438 if (VIsUndefShuffle) {
1439 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1442 Args.push_back(Builder.getInt32(j));
1445 for (unsigned j = 0, je = InitElts; j != je; ++j)
1446 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1447 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1449 if (VIsUndefShuffle)
1450 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1456 // Extend init to result vector length, and then shuffle its contribution
1457 // to the vector initializer into V.
1459 for (unsigned j = 0; j != InitElts; ++j)
1460 Args.push_back(Builder.getInt32(j));
1461 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1462 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1463 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1467 for (unsigned j = 0; j != CurIdx; ++j)
1468 Args.push_back(Builder.getInt32(j));
1469 for (unsigned j = 0; j != InitElts; ++j)
1470 Args.push_back(Builder.getInt32(j+Offset));
1471 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1474 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1475 // merging subsequent shuffles into this one.
1478 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1479 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1480 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1484 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1485 // Emit remaining default initializers.
1486 llvm::Type *EltTy = VType->getElementType();
1488 // Emit remaining default initializers
1489 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1490 Value *Idx = Builder.getInt32(CurIdx);
1491 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1492 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1497 bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) {
1498 const Expr *E = CE->getSubExpr();
1500 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1503 if (isa<CXXThisExpr>(E->IgnoreParens())) {
1504 // We always assume that 'this' is never null.
1508 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1509 // And that glvalue casts are never null.
1510 if (ICE->getValueKind() != VK_RValue)
1517 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1518 // have to handle a more broad range of conversions than explicit casts, as they
1519 // handle things like function to ptr-to-function decay etc.
1520 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1521 Expr *E = CE->getSubExpr();
1522 QualType DestTy = CE->getType();
1523 CastKind Kind = CE->getCastKind();
1525 // These cases are generally not written to ignore the result of
1526 // evaluating their sub-expressions, so we clear this now.
1527 bool Ignored = TestAndClearIgnoreResultAssign();
1529 // Since almost all cast kinds apply to scalars, this switch doesn't have
1530 // a default case, so the compiler will warn on a missing case. The cases
1531 // are in the same order as in the CastKind enum.
1533 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1534 case CK_BuiltinFnToFnPtr:
1535 llvm_unreachable("builtin functions are handled elsewhere");
1537 case CK_LValueBitCast:
1538 case CK_ObjCObjectLValueCast: {
1539 Address Addr = EmitLValue(E).getAddress();
1540 Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy));
1541 LValue LV = CGF.MakeAddrLValue(Addr, DestTy);
1542 return EmitLoadOfLValue(LV, CE->getExprLoc());
1545 case CK_CPointerToObjCPointerCast:
1546 case CK_BlockPointerToObjCPointerCast:
1547 case CK_AnyPointerToBlockPointerCast:
1549 Value *Src = Visit(const_cast<Expr*>(E));
1550 llvm::Type *SrcTy = Src->getType();
1551 llvm::Type *DstTy = ConvertType(DestTy);
1552 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1553 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1554 llvm_unreachable("wrong cast for pointers in different address spaces"
1555 "(must be an address space cast)!");
1558 if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
1559 if (auto PT = DestTy->getAs<PointerType>())
1560 CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src,
1562 CodeGenFunction::CFITCK_UnrelatedCast,
1566 return Builder.CreateBitCast(Src, DstTy);
1568 case CK_AddressSpaceConversion: {
1569 Expr::EvalResult Result;
1570 if (E->EvaluateAsRValue(Result, CGF.getContext()) &&
1571 Result.Val.isNullPointer()) {
1572 // If E has side effect, it is emitted even if its final result is a
1573 // null pointer. In that case, a DCE pass should be able to
1574 // eliminate the useless instructions emitted during translating E.
1575 if (Result.HasSideEffects)
1577 return CGF.CGM.getNullPointer(cast<llvm::PointerType>(
1578 ConvertType(DestTy)), DestTy);
1580 // Since target may map different address spaces in AST to the same address
1581 // space, an address space conversion may end up as a bitcast.
1582 auto *Src = Visit(E);
1583 return CGF.CGM.getTargetCodeGenInfo().performAddrSpaceCast(CGF, Src,
1587 case CK_AtomicToNonAtomic:
1588 case CK_NonAtomicToAtomic:
1590 case CK_UserDefinedConversion:
1591 return Visit(const_cast<Expr*>(E));
1593 case CK_BaseToDerived: {
1594 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1595 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1597 Address Base = CGF.EmitPointerWithAlignment(E);
1599 CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl,
1600 CE->path_begin(), CE->path_end(),
1601 CGF.ShouldNullCheckClassCastValue(CE));
1603 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1604 // performed and the object is not of the derived type.
1605 if (CGF.sanitizePerformTypeCheck())
1606 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1607 Derived.getPointer(), DestTy->getPointeeType());
1609 if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
1610 CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(),
1611 Derived.getPointer(),
1613 CodeGenFunction::CFITCK_DerivedCast,
1616 return Derived.getPointer();
1618 case CK_UncheckedDerivedToBase:
1619 case CK_DerivedToBase: {
1620 // The EmitPointerWithAlignment path does this fine; just discard
1622 return CGF.EmitPointerWithAlignment(CE).getPointer();
1626 Address V = CGF.EmitPointerWithAlignment(E);
1627 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1628 return CGF.EmitDynamicCast(V, DCE);
1631 case CK_ArrayToPointerDecay:
1632 return CGF.EmitArrayToPointerDecay(E).getPointer();
1633 case CK_FunctionToPointerDecay:
1634 return EmitLValue(E).getPointer();
1636 case CK_NullToPointer:
1637 if (MustVisitNullValue(E))
1640 return CGF.CGM.getNullPointer(cast<llvm::PointerType>(ConvertType(DestTy)),
1643 case CK_NullToMemberPointer: {
1644 if (MustVisitNullValue(E))
1647 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1648 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1651 case CK_ReinterpretMemberPointer:
1652 case CK_BaseToDerivedMemberPointer:
1653 case CK_DerivedToBaseMemberPointer: {
1654 Value *Src = Visit(E);
1656 // Note that the AST doesn't distinguish between checked and
1657 // unchecked member pointer conversions, so we always have to
1658 // implement checked conversions here. This is inefficient when
1659 // actual control flow may be required in order to perform the
1660 // check, which it is for data member pointers (but not member
1661 // function pointers on Itanium and ARM).
1662 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1665 case CK_ARCProduceObject:
1666 return CGF.EmitARCRetainScalarExpr(E);
1667 case CK_ARCConsumeObject:
1668 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1669 case CK_ARCReclaimReturnedObject:
1670 return CGF.EmitARCReclaimReturnedObject(E, /*allowUnsafe*/ Ignored);
1671 case CK_ARCExtendBlockObject:
1672 return CGF.EmitARCExtendBlockObject(E);
1674 case CK_CopyAndAutoreleaseBlockObject:
1675 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1677 case CK_FloatingRealToComplex:
1678 case CK_FloatingComplexCast:
1679 case CK_IntegralRealToComplex:
1680 case CK_IntegralComplexCast:
1681 case CK_IntegralComplexToFloatingComplex:
1682 case CK_FloatingComplexToIntegralComplex:
1683 case CK_ConstructorConversion:
1685 llvm_unreachable("scalar cast to non-scalar value");
1687 case CK_LValueToRValue:
1688 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1689 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1690 return Visit(const_cast<Expr*>(E));
1692 case CK_IntegralToPointer: {
1693 Value *Src = Visit(const_cast<Expr*>(E));
1695 // First, convert to the correct width so that we control the kind of
1697 auto DestLLVMTy = ConvertType(DestTy);
1698 llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DestLLVMTy);
1699 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1700 llvm::Value* IntResult =
1701 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1703 return Builder.CreateIntToPtr(IntResult, DestLLVMTy);
1705 case CK_PointerToIntegral:
1706 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1707 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1710 CGF.EmitIgnoredExpr(E);
1713 case CK_VectorSplat: {
1714 llvm::Type *DstTy = ConvertType(DestTy);
1715 Value *Elt = Visit(const_cast<Expr*>(E));
1716 // Splat the element across to all elements
1717 unsigned NumElements = DstTy->getVectorNumElements();
1718 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1721 case CK_IntegralCast:
1722 case CK_IntegralToFloating:
1723 case CK_FloatingToIntegral:
1724 case CK_FloatingCast:
1725 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1727 case CK_BooleanToSignedIntegral:
1728 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1730 /*TreatBooleanAsSigned=*/true);
1731 case CK_IntegralToBoolean:
1732 return EmitIntToBoolConversion(Visit(E));
1733 case CK_PointerToBoolean:
1734 return EmitPointerToBoolConversion(Visit(E), E->getType());
1735 case CK_FloatingToBoolean:
1736 return EmitFloatToBoolConversion(Visit(E));
1737 case CK_MemberPointerToBoolean: {
1738 llvm::Value *MemPtr = Visit(E);
1739 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1740 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1743 case CK_FloatingComplexToReal:
1744 case CK_IntegralComplexToReal:
1745 return CGF.EmitComplexExpr(E, false, true).first;
1747 case CK_FloatingComplexToBoolean:
1748 case CK_IntegralComplexToBoolean: {
1749 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1751 // TODO: kill this function off, inline appropriate case here
1752 return EmitComplexToScalarConversion(V, E->getType(), DestTy,
1756 case CK_ZeroToOCLEvent: {
1757 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1758 return llvm::Constant::getNullValue(ConvertType(DestTy));
1761 case CK_ZeroToOCLQueue: {
1762 assert(DestTy->isQueueT() && "CK_ZeroToOCLQueue cast on non queue_t type");
1763 return llvm::Constant::getNullValue(ConvertType(DestTy));
1766 case CK_IntToOCLSampler:
1767 return CGF.CGM.createOpenCLIntToSamplerConversion(E, CGF);
\r
1771 llvm_unreachable("unknown scalar cast");
1774 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1775 CodeGenFunction::StmtExprEvaluation eval(CGF);
1776 Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1777 !E->getType()->isVoidType());
1778 if (!RetAlloca.isValid())
1780 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1784 Value *ScalarExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) {
1785 CGF.enterFullExpression(E);
1786 CodeGenFunction::RunCleanupsScope Scope(CGF);
1787 Value *V = Visit(E->getSubExpr());
1788 // Defend against dominance problems caused by jumps out of expression
1789 // evaluation through the shared cleanup block.
1790 Scope.ForceCleanup({&V});
1794 //===----------------------------------------------------------------------===//
1796 //===----------------------------------------------------------------------===//
1798 static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
1799 llvm::Value *InVal, bool IsInc) {
1802 BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
1803 BinOp.Ty = E->getType();
1804 BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
1805 // FIXME: once UnaryOperator carries FPFeatures, copy it here.
1810 llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
1811 const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
1812 llvm::Value *Amount =
1813 llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true);
1814 StringRef Name = IsInc ? "inc" : "dec";
1815 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1816 case LangOptions::SOB_Defined:
1817 return Builder.CreateAdd(InVal, Amount, Name);
1818 case LangOptions::SOB_Undefined:
1819 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
1820 return Builder.CreateNSWAdd(InVal, Amount, Name);
1822 case LangOptions::SOB_Trapping:
1823 if (IsWidenedIntegerOp(CGF.getContext(), E->getSubExpr()))
1824 return Builder.CreateNSWAdd(InVal, Amount, Name);
1825 return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc));
1827 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1831 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1832 bool isInc, bool isPre) {
1834 QualType type = E->getSubExpr()->getType();
1835 llvm::PHINode *atomicPHI = nullptr;
1839 int amount = (isInc ? 1 : -1);
1841 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1842 type = atomicTy->getValueType();
1843 if (isInc && type->isBooleanType()) {
1844 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1846 Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified())
1847 ->setAtomic(llvm::AtomicOrdering::SequentiallyConsistent);
1848 return Builder.getTrue();
1850 // For atomic bool increment, we just store true and return it for
1851 // preincrement, do an atomic swap with true for postincrement
1852 return Builder.CreateAtomicRMW(
1853 llvm::AtomicRMWInst::Xchg, LV.getPointer(), True,
1854 llvm::AtomicOrdering::SequentiallyConsistent);
1856 // Special case for atomic increment / decrement on integers, emit
1857 // atomicrmw instructions. We skip this if we want to be doing overflow
1858 // checking, and fall into the slow path with the atomic cmpxchg loop.
1859 if (!type->isBooleanType() && type->isIntegerType() &&
1860 !(type->isUnsignedIntegerType() &&
1861 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
1862 CGF.getLangOpts().getSignedOverflowBehavior() !=
1863 LangOptions::SOB_Trapping) {
1864 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1865 llvm::AtomicRMWInst::Sub;
1866 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1867 llvm::Instruction::Sub;
1868 llvm::Value *amt = CGF.EmitToMemory(
1869 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1870 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1871 LV.getPointer(), amt, llvm::AtomicOrdering::SequentiallyConsistent);
1872 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1874 value = EmitLoadOfLValue(LV, E->getExprLoc());
1876 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1877 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1878 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1879 value = CGF.EmitToMemory(value, type);
1880 Builder.CreateBr(opBB);
1881 Builder.SetInsertPoint(opBB);
1882 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1883 atomicPHI->addIncoming(value, startBB);
1886 value = EmitLoadOfLValue(LV, E->getExprLoc());
1890 // Special case of integer increment that we have to check first: bool++.
1891 // Due to promotion rules, we get:
1892 // bool++ -> bool = bool + 1
1893 // -> bool = (int)bool + 1
1894 // -> bool = ((int)bool + 1 != 0)
1895 // An interesting aspect of this is that increment is always true.
1896 // Decrement does not have this property.
1897 if (isInc && type->isBooleanType()) {
1898 value = Builder.getTrue();
1900 // Most common case by far: integer increment.
1901 } else if (type->isIntegerType()) {
1902 // Note that signed integer inc/dec with width less than int can't
1903 // overflow because of promotion rules; we're just eliding a few steps here.
1904 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1905 CGF.IntTy->getIntegerBitWidth();
1906 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1907 value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
1908 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1909 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
1911 EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc));
1913 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1914 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1917 // Next most common: pointer increment.
1918 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1919 QualType type = ptr->getPointeeType();
1921 // VLA types don't have constant size.
1922 if (const VariableArrayType *vla
1923 = CGF.getContext().getAsVariableArrayType(type)) {
1924 llvm::Value *numElts = CGF.getVLASize(vla).first;
1925 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1926 if (CGF.getLangOpts().isSignedOverflowDefined())
1927 value = Builder.CreateGEP(value, numElts, "vla.inc");
1929 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1931 // Arithmetic on function pointers (!) is just +-1.
1932 } else if (type->isFunctionType()) {
1933 llvm::Value *amt = Builder.getInt32(amount);
1935 value = CGF.EmitCastToVoidPtr(value);
1936 if (CGF.getLangOpts().isSignedOverflowDefined())
1937 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1939 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1940 value = Builder.CreateBitCast(value, input->getType());
1942 // For everything else, we can just do a simple increment.
1944 llvm::Value *amt = Builder.getInt32(amount);
1945 if (CGF.getLangOpts().isSignedOverflowDefined())
1946 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1948 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1951 // Vector increment/decrement.
1952 } else if (type->isVectorType()) {
1953 if (type->hasIntegerRepresentation()) {
1954 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1956 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1958 value = Builder.CreateFAdd(
1960 llvm::ConstantFP::get(value->getType(), amount),
1961 isInc ? "inc" : "dec");
1965 } else if (type->isRealFloatingType()) {
1966 // Add the inc/dec to the real part.
1969 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1970 // Another special case: half FP increment should be done via float
1971 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1972 value = Builder.CreateCall(
1973 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1975 input, "incdec.conv");
1977 value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv");
1981 if (value->getType()->isFloatTy())
1982 amt = llvm::ConstantFP::get(VMContext,
1983 llvm::APFloat(static_cast<float>(amount)));
1984 else if (value->getType()->isDoubleTy())
1985 amt = llvm::ConstantFP::get(VMContext,
1986 llvm::APFloat(static_cast<double>(amount)));
1988 // Remaining types are Half, LongDouble or __float128. Convert from float.
1989 llvm::APFloat F(static_cast<float>(amount));
1991 const llvm::fltSemantics *FS;
1992 // Don't use getFloatTypeSemantics because Half isn't
1993 // necessarily represented using the "half" LLVM type.
1994 if (value->getType()->isFP128Ty())
1995 FS = &CGF.getTarget().getFloat128Format();
1996 else if (value->getType()->isHalfTy())
1997 FS = &CGF.getTarget().getHalfFormat();
1999 FS = &CGF.getTarget().getLongDoubleFormat();
2000 F.convert(*FS, llvm::APFloat::rmTowardZero, &ignored);
2001 amt = llvm::ConstantFP::get(VMContext, F);
2003 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
2005 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
2006 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
2007 value = Builder.CreateCall(
2008 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
2010 value, "incdec.conv");
2012 value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv");
2016 // Objective-C pointer types.
2018 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
2019 value = CGF.EmitCastToVoidPtr(value);
2021 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
2022 if (!isInc) size = -size;
2023 llvm::Value *sizeValue =
2024 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
2026 if (CGF.getLangOpts().isSignedOverflowDefined())
2027 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
2029 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
2030 value = Builder.CreateBitCast(value, input->getType());
2034 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2035 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2036 auto Pair = CGF.EmitAtomicCompareExchange(
2037 LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
2038 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
2039 llvm::Value *success = Pair.second;
2040 atomicPHI->addIncoming(old, opBB);
2041 Builder.CreateCondBr(success, contBB, opBB);
2042 Builder.SetInsertPoint(contBB);
2043 return isPre ? value : input;
2046 // Store the updated result through the lvalue.
2047 if (LV.isBitField())
2048 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
2050 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
2052 // If this is a postinc, return the value read from memory, otherwise use the
2054 return isPre ? value : input;
2059 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
2060 TestAndClearIgnoreResultAssign();
2061 // Emit unary minus with EmitSub so we handle overflow cases etc.
2063 BinOp.RHS = Visit(E->getSubExpr());
2065 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
2066 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
2068 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
2069 BinOp.Ty = E->getType();
2070 BinOp.Opcode = BO_Sub;
2071 // FIXME: once UnaryOperator carries FPFeatures, copy it here.
2073 return EmitSub(BinOp);
2076 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
2077 TestAndClearIgnoreResultAssign();
2078 Value *Op = Visit(E->getSubExpr());
2079 return Builder.CreateNot(Op, "neg");
2082 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
2083 // Perform vector logical not on comparison with zero vector.
2084 if (E->getType()->isExtVectorType()) {
2085 Value *Oper = Visit(E->getSubExpr());
2086 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
2088 if (Oper->getType()->isFPOrFPVectorTy())
2089 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
2091 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
2092 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2095 // Compare operand to zero.
2096 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
2099 // TODO: Could dynamically modify easy computations here. For example, if
2100 // the operand is an icmp ne, turn into icmp eq.
2101 BoolVal = Builder.CreateNot(BoolVal, "lnot");
2103 // ZExt result to the expr type.
2104 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
2107 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
2108 // Try folding the offsetof to a constant.
2110 if (E->EvaluateAsInt(Value, CGF.getContext()))
2111 return Builder.getInt(Value);
2113 // Loop over the components of the offsetof to compute the value.
2114 unsigned n = E->getNumComponents();
2115 llvm::Type* ResultType = ConvertType(E->getType());
2116 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
2117 QualType CurrentType = E->getTypeSourceInfo()->getType();
2118 for (unsigned i = 0; i != n; ++i) {
2119 OffsetOfNode ON = E->getComponent(i);
2120 llvm::Value *Offset = nullptr;
2121 switch (ON.getKind()) {
2122 case OffsetOfNode::Array: {
2123 // Compute the index
2124 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
2125 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
2126 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
2127 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
2129 // Save the element type
2131 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
2133 // Compute the element size
2134 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
2135 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
2137 // Multiply out to compute the result
2138 Offset = Builder.CreateMul(Idx, ElemSize);
2142 case OffsetOfNode::Field: {
2143 FieldDecl *MemberDecl = ON.getField();
2144 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
2145 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
2147 // Compute the index of the field in its parent.
2149 // FIXME: It would be nice if we didn't have to loop here!
2150 for (RecordDecl::field_iterator Field = RD->field_begin(),
2151 FieldEnd = RD->field_end();
2152 Field != FieldEnd; ++Field, ++i) {
2153 if (*Field == MemberDecl)
2156 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
2158 // Compute the offset to the field
2159 int64_t OffsetInt = RL.getFieldOffset(i) /
2160 CGF.getContext().getCharWidth();
2161 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
2163 // Save the element type.
2164 CurrentType = MemberDecl->getType();
2168 case OffsetOfNode::Identifier:
2169 llvm_unreachable("dependent __builtin_offsetof");
2171 case OffsetOfNode::Base: {
2172 if (ON.getBase()->isVirtual()) {
2173 CGF.ErrorUnsupported(E, "virtual base in offsetof");
2177 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
2178 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
2180 // Save the element type.
2181 CurrentType = ON.getBase()->getType();
2183 // Compute the offset to the base.
2184 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
2185 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
2186 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
2187 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
2191 Result = Builder.CreateAdd(Result, Offset);
2196 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
2197 /// argument of the sizeof expression as an integer.
2199 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
2200 const UnaryExprOrTypeTraitExpr *E) {
2201 QualType TypeToSize = E->getTypeOfArgument();
2202 if (E->getKind() == UETT_SizeOf) {
2203 if (const VariableArrayType *VAT =
2204 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
2205 if (E->isArgumentType()) {
2206 // sizeof(type) - make sure to emit the VLA size.
2207 CGF.EmitVariablyModifiedType(TypeToSize);
2209 // C99 6.5.3.4p2: If the argument is an expression of type
2210 // VLA, it is evaluated.
2211 CGF.EmitIgnoredExpr(E->getArgumentExpr());
2215 llvm::Value *numElts;
2216 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
2218 llvm::Value *size = numElts;
2220 // Scale the number of non-VLA elements by the non-VLA element size.
2221 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
2222 if (!eltSize.isOne())
2223 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
2227 } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) {
2230 .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign(
2231 E->getTypeOfArgument()->getPointeeType()))
2233 return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
2236 // If this isn't sizeof(vla), the result must be constant; use the constant
2237 // folding logic so we don't have to duplicate it here.
2238 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
2241 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
2242 Expr *Op = E->getSubExpr();
2243 if (Op->getType()->isAnyComplexType()) {
2244 // If it's an l-value, load through the appropriate subobject l-value.
2245 // Note that we have to ask E because Op might be an l-value that
2246 // this won't work for, e.g. an Obj-C property.
2248 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2249 E->getExprLoc()).getScalarVal();
2251 // Otherwise, calculate and project.
2252 return CGF.EmitComplexExpr(Op, false, true).first;
2258 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
2259 Expr *Op = E->getSubExpr();
2260 if (Op->getType()->isAnyComplexType()) {
2261 // If it's an l-value, load through the appropriate subobject l-value.
2262 // Note that we have to ask E because Op might be an l-value that
2263 // this won't work for, e.g. an Obj-C property.
2264 if (Op->isGLValue())
2265 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2266 E->getExprLoc()).getScalarVal();
2268 // Otherwise, calculate and project.
2269 return CGF.EmitComplexExpr(Op, true, false).second;
2272 // __imag on a scalar returns zero. Emit the subexpr to ensure side
2273 // effects are evaluated, but not the actual value.
2274 if (Op->isGLValue())
2277 CGF.EmitScalarExpr(Op, true);
2278 return llvm::Constant::getNullValue(ConvertType(E->getType()));
2281 //===----------------------------------------------------------------------===//
2283 //===----------------------------------------------------------------------===//
2285 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
2286 TestAndClearIgnoreResultAssign();
2288 Result.LHS = Visit(E->getLHS());
2289 Result.RHS = Visit(E->getRHS());
2290 Result.Ty = E->getType();
2291 Result.Opcode = E->getOpcode();
2292 Result.FPFeatures = E->getFPFeatures();
2297 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
2298 const CompoundAssignOperator *E,
2299 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2301 QualType LHSTy = E->getLHS()->getType();
2304 if (E->getComputationResultType()->isAnyComplexType())
2305 return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
2307 // Emit the RHS first. __block variables need to have the rhs evaluated
2308 // first, plus this should improve codegen a little.
2309 OpInfo.RHS = Visit(E->getRHS());
2310 OpInfo.Ty = E->getComputationResultType();
2311 OpInfo.Opcode = E->getOpcode();
2312 OpInfo.FPFeatures = E->getFPFeatures();
2314 // Load/convert the LHS.
2315 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2317 llvm::PHINode *atomicPHI = nullptr;
2318 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2319 QualType type = atomicTy->getValueType();
2320 if (!type->isBooleanType() && type->isIntegerType() &&
2321 !(type->isUnsignedIntegerType() &&
2322 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
2323 CGF.getLangOpts().getSignedOverflowBehavior() !=
2324 LangOptions::SOB_Trapping) {
2325 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2326 switch (OpInfo.Opcode) {
2327 // We don't have atomicrmw operands for *, %, /, <<, >>
2328 case BO_MulAssign: case BO_DivAssign:
2334 aop = llvm::AtomicRMWInst::Add;
2337 aop = llvm::AtomicRMWInst::Sub;
2340 aop = llvm::AtomicRMWInst::And;
2343 aop = llvm::AtomicRMWInst::Xor;
2346 aop = llvm::AtomicRMWInst::Or;
2349 llvm_unreachable("Invalid compound assignment type");
2351 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2352 llvm::Value *amt = CGF.EmitToMemory(
2353 EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy,
2356 Builder.CreateAtomicRMW(aop, LHSLV.getPointer(), amt,
2357 llvm::AtomicOrdering::SequentiallyConsistent);
2361 // FIXME: For floating point types, we should be saving and restoring the
2362 // floating point environment in the loop.
2363 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2364 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2365 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2366 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2367 Builder.CreateBr(opBB);
2368 Builder.SetInsertPoint(opBB);
2369 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2370 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2371 OpInfo.LHS = atomicPHI;
2374 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2376 SourceLocation Loc = E->getExprLoc();
2378 EmitScalarConversion(OpInfo.LHS, LHSTy, E->getComputationLHSType(), Loc);
2380 // Expand the binary operator.
2381 Result = (this->*Func)(OpInfo);
2383 // Convert the result back to the LHS type.
2385 EmitScalarConversion(Result, E->getComputationResultType(), LHSTy, Loc);
2388 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2389 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2390 auto Pair = CGF.EmitAtomicCompareExchange(
2391 LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
2392 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
2393 llvm::Value *success = Pair.second;
2394 atomicPHI->addIncoming(old, opBB);
2395 Builder.CreateCondBr(success, contBB, opBB);
2396 Builder.SetInsertPoint(contBB);
2400 // Store the result value into the LHS lvalue. Bit-fields are handled
2401 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2402 // 'An assignment expression has the value of the left operand after the
2404 if (LHSLV.isBitField())
2405 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2407 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2412 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2413 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2414 bool Ignore = TestAndClearIgnoreResultAssign();
2416 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2418 // If the result is clearly ignored, return now.
2422 // The result of an assignment in C is the assigned r-value.
2423 if (!CGF.getLangOpts().CPlusPlus)
2426 // If the lvalue is non-volatile, return the computed value of the assignment.
2427 if (!LHS.isVolatileQualified())
2430 // Otherwise, reload the value.
2431 return EmitLoadOfLValue(LHS, E->getExprLoc());
2434 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2435 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2436 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks;
2438 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2439 Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
2440 SanitizerKind::IntegerDivideByZero));
2443 const auto *BO = cast<BinaryOperator>(Ops.E);
2444 if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
2445 Ops.Ty->hasSignedIntegerRepresentation() &&
2446 !IsWidenedIntegerOp(CGF.getContext(), BO->getLHS()) &&
2447 Ops.mayHaveIntegerOverflow()) {
2448 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2450 llvm::Value *IntMin =
2451 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2452 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2454 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2455 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2456 llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2458 std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow));
2461 if (Checks.size() > 0)
2462 EmitBinOpCheck(Checks, Ops);
2465 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2467 CodeGenFunction::SanitizerScope SanScope(&CGF);
2468 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2469 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2470 Ops.Ty->isIntegerType() &&
2471 (Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) {
2472 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2473 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2474 } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
2475 Ops.Ty->isRealFloatingType() &&
2476 Ops.mayHaveFloatDivisionByZero()) {
2477 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2478 llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
2479 EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero),
2484 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2485 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2486 if (CGF.getLangOpts().OpenCL &&
2487 !CGF.CGM.getCodeGenOpts().CorrectlyRoundedDivSqrt) {
2488 // OpenCL v1.1 s7.4: minimum accuracy of single precision / is 2.5ulp
2489 // OpenCL v1.2 s5.6.4.2: The -cl-fp32-correctly-rounded-divide-sqrt
2490 // build option allows an application to specify that single precision
2491 // floating-point divide (x/y and 1/x) and sqrt used in the program
2492 // source are correctly rounded.
2493 llvm::Type *ValTy = Val->getType();
2494 if (ValTy->isFloatTy() ||
2495 (isa<llvm::VectorType>(ValTy) &&
2496 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2497 CGF.SetFPAccuracy(Val, 2.5);
2501 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2502 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2504 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2507 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2508 // Rem in C can't be a floating point type: C99 6.5.5p2.
2509 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2510 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2511 Ops.Ty->isIntegerType() &&
2512 (Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) {
2513 CodeGenFunction::SanitizerScope SanScope(&CGF);
2514 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2515 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2518 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2519 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2521 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2524 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2528 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2529 switch (Ops.Opcode) {
2533 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2534 llvm::Intrinsic::uadd_with_overflow;
2539 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2540 llvm::Intrinsic::usub_with_overflow;
2545 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2546 llvm::Intrinsic::umul_with_overflow;
2549 llvm_unreachable("Unsupported operation for overflow detection");
2555 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2557 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2559 Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
2560 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2561 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2563 // Handle overflow with llvm.trap if no custom handler has been specified.
2564 const std::string *handlerName =
2565 &CGF.getLangOpts().OverflowHandler;
2566 if (handlerName->empty()) {
2567 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2568 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2569 if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
2570 CodeGenFunction::SanitizerScope SanScope(&CGF);
2571 llvm::Value *NotOverflow = Builder.CreateNot(overflow);
2572 SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow
2573 : SanitizerKind::UnsignedIntegerOverflow;
2574 EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops);
2576 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2580 // Branch in case of overflow.
2581 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2582 llvm::BasicBlock *continueBB =
2583 CGF.createBasicBlock("nooverflow", CGF.CurFn, initialBB->getNextNode());
2584 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2586 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2588 // If an overflow handler is set, then we want to call it and then use its
2589 // result, if it returns.
2590 Builder.SetInsertPoint(overflowBB);
2592 // Get the overflow handler.
2593 llvm::Type *Int8Ty = CGF.Int8Ty;
2594 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2595 llvm::FunctionType *handlerTy =
2596 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2597 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2599 // Sign extend the args to 64-bit, so that we can use the same handler for
2600 // all types of overflow.
2601 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2602 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2604 // Call the handler with the two arguments, the operation, and the size of
2606 llvm::Value *handlerArgs[] = {
2609 Builder.getInt8(OpID),
2610 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2612 llvm::Value *handlerResult =
2613 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2615 // Truncate the result back to the desired size.
2616 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2617 Builder.CreateBr(continueBB);
2619 Builder.SetInsertPoint(continueBB);
2620 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2621 phi->addIncoming(result, initialBB);
2622 phi->addIncoming(handlerResult, overflowBB);
2627 /// Emit pointer + index arithmetic.
2628 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2629 const BinOpInfo &op,
2630 bool isSubtraction) {
2631 // Must have binary (not unary) expr here. Unary pointer
2632 // increment/decrement doesn't use this path.
2633 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2635 Value *pointer = op.LHS;
2636 Expr *pointerOperand = expr->getLHS();
2637 Value *index = op.RHS;
2638 Expr *indexOperand = expr->getRHS();
2640 // In a subtraction, the LHS is always the pointer.
2641 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2642 std::swap(pointer, index);
2643 std::swap(pointerOperand, indexOperand);
2646 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2647 auto &DL = CGF.CGM.getDataLayout();
2648 auto PtrTy = cast<llvm::PointerType>(pointer->getType());
2649 if (width != DL.getTypeSizeInBits(PtrTy)) {
2650 // Zero-extend or sign-extend the pointer value according to
2651 // whether the index is signed or not.
2652 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2653 index = CGF.Builder.CreateIntCast(index, DL.getIntPtrType(PtrTy), isSigned,
2657 // If this is subtraction, negate the index.
2659 index = CGF.Builder.CreateNeg(index, "idx.neg");
2661 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
2662 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2663 /*Accessed*/ false);
2665 const PointerType *pointerType
2666 = pointerOperand->getType()->getAs<PointerType>();
2668 QualType objectType = pointerOperand->getType()
2669 ->castAs<ObjCObjectPointerType>()
2671 llvm::Value *objectSize
2672 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2674 index = CGF.Builder.CreateMul(index, objectSize);
2676 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2677 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2678 return CGF.Builder.CreateBitCast(result, pointer->getType());
2681 QualType elementType = pointerType->getPointeeType();
2682 if (const VariableArrayType *vla
2683 = CGF.getContext().getAsVariableArrayType(elementType)) {
2684 // The element count here is the total number of non-VLA elements.
2685 llvm::Value *numElements = CGF.getVLASize(vla).first;
2687 // Effectively, the multiply by the VLA size is part of the GEP.
2688 // GEP indexes are signed, and scaling an index isn't permitted to
2689 // signed-overflow, so we use the same semantics for our explicit
2690 // multiply. We suppress this if overflow is not undefined behavior.
2691 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2692 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2693 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2695 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2696 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2701 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2702 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2704 if (elementType->isVoidType() || elementType->isFunctionType()) {
2705 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2706 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2707 return CGF.Builder.CreateBitCast(result, pointer->getType());
2710 if (CGF.getLangOpts().isSignedOverflowDefined())
2711 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2713 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2716 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2717 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2718 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2719 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2720 // efficient operations.
2721 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2722 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2723 bool negMul, bool negAdd) {
2724 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2726 Value *MulOp0 = MulOp->getOperand(0);
2727 Value *MulOp1 = MulOp->getOperand(1);
2731 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2733 } else if (negAdd) {
2736 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2740 Value *FMulAdd = Builder.CreateCall(
2741 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2742 {MulOp0, MulOp1, Addend});
2743 MulOp->eraseFromParent();
2748 // Check whether it would be legal to emit an fmuladd intrinsic call to
2749 // represent op and if so, build the fmuladd.
2751 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2752 // Does NOT check the type of the operation - it's assumed that this function
2753 // will be called from contexts where it's known that the type is contractable.
2754 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2755 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2758 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2759 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2760 "Only fadd/fsub can be the root of an fmuladd.");
2762 // Check whether this op is marked as fusable.
2763 if (!op.FPFeatures.allowFPContractWithinStatement())
2766 // We have a potentially fusable op. Look for a mul on one of the operands.
2767 // Also, make sure that the mul result isn't used directly. In that case,
2768 // there's no point creating a muladd operation.
2769 if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2770 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2771 LHSBinOp->use_empty())
2772 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2774 if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2775 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2776 RHSBinOp->use_empty())
2777 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2783 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2784 if (op.LHS->getType()->isPointerTy() ||
2785 op.RHS->getType()->isPointerTy())
2786 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2788 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2789 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2790 case LangOptions::SOB_Defined:
2791 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2792 case LangOptions::SOB_Undefined:
2793 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2794 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2796 case LangOptions::SOB_Trapping:
2797 if (CanElideOverflowCheck(CGF.getContext(), op))
2798 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2799 return EmitOverflowCheckedBinOp(op);
2803 if (op.Ty->isUnsignedIntegerType() &&
2804 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) &&
2805 !CanElideOverflowCheck(CGF.getContext(), op))
2806 return EmitOverflowCheckedBinOp(op);
2808 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2809 // Try to form an fmuladd.
2810 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2813 Value *V = Builder.CreateFAdd(op.LHS, op.RHS, "add");
2814 return propagateFMFlags(V, op);
2817 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2820 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2821 // The LHS is always a pointer if either side is.
2822 if (!op.LHS->getType()->isPointerTy()) {
2823 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2824 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2825 case LangOptions::SOB_Defined:
2826 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2827 case LangOptions::SOB_Undefined:
2828 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2829 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2831 case LangOptions::SOB_Trapping:
2832 if (CanElideOverflowCheck(CGF.getContext(), op))
2833 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2834 return EmitOverflowCheckedBinOp(op);
2838 if (op.Ty->isUnsignedIntegerType() &&
2839 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) &&
2840 !CanElideOverflowCheck(CGF.getContext(), op))
2841 return EmitOverflowCheckedBinOp(op);
2843 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2844 // Try to form an fmuladd.
2845 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2847 Value *V = Builder.CreateFSub(op.LHS, op.RHS, "sub");
2848 return propagateFMFlags(V, op);
2851 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2854 // If the RHS is not a pointer, then we have normal pointer
2856 if (!op.RHS->getType()->isPointerTy())
2857 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2859 // Otherwise, this is a pointer subtraction.
2861 // Do the raw subtraction part.
2863 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2865 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2866 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2868 // Okay, figure out the element size.
2869 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2870 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2872 llvm::Value *divisor = nullptr;
2874 // For a variable-length array, this is going to be non-constant.
2875 if (const VariableArrayType *vla
2876 = CGF.getContext().getAsVariableArrayType(elementType)) {
2877 llvm::Value *numElements;
2878 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2880 divisor = numElements;
2882 // Scale the number of non-VLA elements by the non-VLA element size.
2883 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2884 if (!eltSize.isOne())
2885 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2887 // For everything elese, we can just compute it, safe in the
2888 // assumption that Sema won't let anything through that we can't
2889 // safely compute the size of.
2891 CharUnits elementSize;
2892 // Handle GCC extension for pointer arithmetic on void* and
2893 // function pointer types.
2894 if (elementType->isVoidType() || elementType->isFunctionType())
2895 elementSize = CharUnits::One();
2897 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2899 // Don't even emit the divide for element size of 1.
2900 if (elementSize.isOne())
2903 divisor = CGF.CGM.getSize(elementSize);
2906 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2907 // pointer difference in C is only defined in the case where both operands
2908 // are pointing to elements of an array.
2909 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2912 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2913 llvm::IntegerType *Ty;
2914 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2915 Ty = cast<llvm::IntegerType>(VT->getElementType());
2917 Ty = cast<llvm::IntegerType>(LHS->getType());
2918 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2921 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2922 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2923 // RHS to the same size as the LHS.
2924 Value *RHS = Ops.RHS;
2925 if (Ops.LHS->getType() != RHS->getType())
2926 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2928 bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
2929 Ops.Ty->hasSignedIntegerRepresentation() &&
2930 !CGF.getLangOpts().isSignedOverflowDefined();
2931 bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
2932 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2933 if (CGF.getLangOpts().OpenCL)
2935 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2936 else if ((SanitizeBase || SanitizeExponent) &&
2937 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2938 CodeGenFunction::SanitizerScope SanScope(&CGF);
2939 SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks;
2940 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, Ops.RHS);
2941 llvm::Value *ValidExponent = Builder.CreateICmpULE(Ops.RHS, WidthMinusOne);
2943 if (SanitizeExponent) {
2945 std::make_pair(ValidExponent, SanitizerKind::ShiftExponent));
2949 // Check whether we are shifting any non-zero bits off the top of the
2950 // integer. We only emit this check if exponent is valid - otherwise
2951 // instructions below will have undefined behavior themselves.
2952 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2953 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2954 llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
2955 Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
2956 llvm::Value *PromotedWidthMinusOne =
2957 (RHS == Ops.RHS) ? WidthMinusOne
2958 : GetWidthMinusOneValue(Ops.LHS, RHS);
2959 CGF.EmitBlock(CheckShiftBase);
2960 llvm::Value *BitsShiftedOff = Builder.CreateLShr(
2961 Ops.LHS, Builder.CreateSub(PromotedWidthMinusOne, RHS, "shl.zeros",
2962 /*NUW*/ true, /*NSW*/ true),
2964 if (CGF.getLangOpts().CPlusPlus) {
2965 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2966 // Under C++11's rules, shifting a 1 bit into the sign bit is
2967 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2968 // define signed left shifts, so we use the C99 and C++11 rules there).
2969 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2970 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2972 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2973 llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2974 CGF.EmitBlock(Cont);
2975 llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
2976 BaseCheck->addIncoming(Builder.getTrue(), Orig);
2977 BaseCheck->addIncoming(ValidBase, CheckShiftBase);
2978 Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase));
2981 assert(!Checks.empty());
2982 EmitBinOpCheck(Checks, Ops);
2985 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2988 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2989 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2990 // RHS to the same size as the LHS.
2991 Value *RHS = Ops.RHS;
2992 if (Ops.LHS->getType() != RHS->getType())
2993 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2995 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2996 if (CGF.getLangOpts().OpenCL)
2998 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2999 else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
3000 isa<llvm::IntegerType>(Ops.LHS->getType())) {
3001 CodeGenFunction::SanitizerScope SanScope(&CGF);
3002 llvm::Value *Valid =
3003 Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS));
3004 EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops);
3007 if (Ops.Ty->hasUnsignedIntegerRepresentation())
3008 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
3009 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
3012 enum IntrinsicType { VCMPEQ, VCMPGT };
3013 // return corresponding comparison intrinsic for given vector type
3014 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
3015 BuiltinType::Kind ElemKind) {
3017 default: llvm_unreachable("unexpected element type");
3018 case BuiltinType::Char_U:
3019 case BuiltinType::UChar:
3020 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
3021 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
3022 case BuiltinType::Char_S:
3023 case BuiltinType::SChar:
3024 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
3025 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
3026 case BuiltinType::UShort:
3027 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
3028 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
3029 case BuiltinType::Short:
3030 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
3031 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
3032 case BuiltinType::UInt:
3033 case BuiltinType::ULong:
3034 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
3035 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
3036 case BuiltinType::Int:
3037 case BuiltinType::Long:
3038 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
3039 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
3040 case BuiltinType::Float:
3041 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
3042 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
3046 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,
3047 llvm::CmpInst::Predicate UICmpOpc,
3048 llvm::CmpInst::Predicate SICmpOpc,
3049 llvm::CmpInst::Predicate FCmpOpc) {
3050 TestAndClearIgnoreResultAssign();
3052 QualType LHSTy = E->getLHS()->getType();
3053 QualType RHSTy = E->getRHS()->getType();
3054 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
3055 assert(E->getOpcode() == BO_EQ ||
3056 E->getOpcode() == BO_NE);
3057 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
3058 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
3059 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
3060 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
3061 } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
3062 Value *LHS = Visit(E->getLHS());
3063 Value *RHS = Visit(E->getRHS());
3065 // If AltiVec, the comparison results in a numeric type, so we use
3066 // intrinsics comparing vectors and giving 0 or 1 as a result
3067 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
3068 // constants for mapping CR6 register bits to predicate result
3069 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
3071 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
3073 // in several cases vector arguments order will be reversed
3074 Value *FirstVecArg = LHS,
3075 *SecondVecArg = RHS;
3077 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
3078 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
3079 BuiltinType::Kind ElementKind = BTy->getKind();
3081 switch(E->getOpcode()) {
3082 default: llvm_unreachable("is not a comparison operation");
3085 ID = GetIntrinsic(VCMPEQ, ElementKind);
3089 ID = GetIntrinsic(VCMPEQ, ElementKind);
3093 ID = GetIntrinsic(VCMPGT, ElementKind);
3094 std::swap(FirstVecArg, SecondVecArg);
3098 ID = GetIntrinsic(VCMPGT, ElementKind);
3101 if (ElementKind == BuiltinType::Float) {
3103 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
3104 std::swap(FirstVecArg, SecondVecArg);
3108 ID = GetIntrinsic(VCMPGT, ElementKind);
3112 if (ElementKind == BuiltinType::Float) {
3114 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
3118 ID = GetIntrinsic(VCMPGT, ElementKind);
3119 std::swap(FirstVecArg, SecondVecArg);
3124 Value *CR6Param = Builder.getInt32(CR6);
3125 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
3126 Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
3127 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
3131 if (LHS->getType()->isFPOrFPVectorTy()) {
3132 Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp");
3133 } else if (LHSTy->hasSignedIntegerRepresentation()) {
3134 Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp");
3136 // Unsigned integers and pointers.
3137 Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp");
3140 // If this is a vector comparison, sign extend the result to the appropriate
3141 // vector integer type and return it (don't convert to bool).
3142 if (LHSTy->isVectorType())
3143 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
3146 // Complex Comparison: can only be an equality comparison.
3147 CodeGenFunction::ComplexPairTy LHS, RHS;
3149 if (auto *CTy = LHSTy->getAs<ComplexType>()) {
3150 LHS = CGF.EmitComplexExpr(E->getLHS());
3151 CETy = CTy->getElementType();
3153 LHS.first = Visit(E->getLHS());
3154 LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
3157 if (auto *CTy = RHSTy->getAs<ComplexType>()) {
3158 RHS = CGF.EmitComplexExpr(E->getRHS());
3159 assert(CGF.getContext().hasSameUnqualifiedType(CETy,
3160 CTy->getElementType()) &&
3161 "The element types must always match.");
3164 RHS.first = Visit(E->getRHS());
3165 RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
3166 assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
3167 "The element types must always match.");
3170 Value *ResultR, *ResultI;
3171 if (CETy->isRealFloatingType()) {
3172 ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r");
3173 ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i");
3175 // Complex comparisons can only be equality comparisons. As such, signed
3176 // and unsigned opcodes are the same.
3177 ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r");
3178 ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i");
3181 if (E->getOpcode() == BO_EQ) {
3182 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
3184 assert(E->getOpcode() == BO_NE &&
3185 "Complex comparison other than == or != ?");
3186 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
3190 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
3194 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
3195 bool Ignore = TestAndClearIgnoreResultAssign();
3200 switch (E->getLHS()->getType().getObjCLifetime()) {
3201 case Qualifiers::OCL_Strong:
3202 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
3205 case Qualifiers::OCL_Autoreleasing:
3206 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
3209 case Qualifiers::OCL_ExplicitNone:
3210 std::tie(LHS, RHS) = CGF.EmitARCStoreUnsafeUnretained(E, Ignore);
3213 case Qualifiers::OCL_Weak:
3214 RHS = Visit(E->getRHS());
3215 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3216 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
3219 case Qualifiers::OCL_None:
3220 // __block variables need to have the rhs evaluated first, plus
3221 // this should improve codegen just a little.
3222 RHS = Visit(E->getRHS());
3223 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3225 // Store the value into the LHS. Bit-fields are handled specially
3226 // because the result is altered by the store, i.e., [C99 6.5.16p1]
3227 // 'An assignment expression has the value of the left operand after
3228 // the assignment...'.
3229 if (LHS.isBitField()) {
3230 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
3232 CGF.EmitNullabilityCheck(LHS, RHS, E->getExprLoc());
3233 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
3237 // If the result is clearly ignored, return now.
3241 // The result of an assignment in C is the assigned r-value.
3242 if (!CGF.getLangOpts().CPlusPlus)
3245 // If the lvalue is non-volatile, return the computed value of the assignment.
3246 if (!LHS.isVolatileQualified())
3249 // Otherwise, reload the value.
3250 return EmitLoadOfLValue(LHS, E->getExprLoc());
3253 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
3254 // Perform vector logical and on comparisons with zero vectors.
3255 if (E->getType()->isVectorType()) {
3256 CGF.incrementProfileCounter(E);
3258 Value *LHS = Visit(E->getLHS());
3259 Value *RHS = Visit(E->getRHS());
3260 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3261 if (LHS->getType()->isFPOrFPVectorTy()) {
3262 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3263 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3265 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3266 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3268 Value *And = Builder.CreateAnd(LHS, RHS);
3269 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
3272 llvm::Type *ResTy = ConvertType(E->getType());
3274 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
3275 // If we have 1 && X, just emit X without inserting the control flow.
3277 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3278 if (LHSCondVal) { // If we have 1 && X, just emit X.
3279 CGF.incrementProfileCounter(E);
3281 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3282 // ZExt result to int or bool.
3283 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
3286 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
3287 if (!CGF.ContainsLabel(E->getRHS()))
3288 return llvm::Constant::getNullValue(ResTy);
3291 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
3292 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
3294 CodeGenFunction::ConditionalEvaluation eval(CGF);
3296 // Branch on the LHS first. If it is false, go to the failure (cont) block.
3297 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock,
3298 CGF.getProfileCount(E->getRHS()));
3300 // Any edges into the ContBlock are now from an (indeterminate number of)
3301 // edges from this first condition. All of these values will be false. Start
3302 // setting up the PHI node in the Cont Block for this.
3303 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3305 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3307 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
3310 CGF.EmitBlock(RHSBlock);
3311 CGF.incrementProfileCounter(E);
3312 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3315 // Reaquire the RHS block, as there may be subblocks inserted.
3316 RHSBlock = Builder.GetInsertBlock();
3318 // Emit an unconditional branch from this block to ContBlock.
3320 // There is no need to emit line number for unconditional branch.
3321 auto NL = ApplyDebugLocation::CreateEmpty(CGF);
3322 CGF.EmitBlock(ContBlock);
3324 // Insert an entry into the phi node for the edge with the value of RHSCond.
3325 PN->addIncoming(RHSCond, RHSBlock);
3327 // ZExt result to int.
3328 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
3331 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
3332 // Perform vector logical or on comparisons with zero vectors.
3333 if (E->getType()->isVectorType()) {
3334 CGF.incrementProfileCounter(E);
3336 Value *LHS = Visit(E->getLHS());
3337 Value *RHS = Visit(E->getRHS());
3338 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3339 if (LHS->getType()->isFPOrFPVectorTy()) {
3340 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3341 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3343 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3344 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3346 Value *Or = Builder.CreateOr(LHS, RHS);
3347 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
3350 llvm::Type *ResTy = ConvertType(E->getType());
3352 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
3353 // If we have 0 || X, just emit X without inserting the control flow.
3355 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3356 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3357 CGF.incrementProfileCounter(E);
3359 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3360 // ZExt result to int or bool.
3361 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3364 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3365 if (!CGF.ContainsLabel(E->getRHS()))
3366 return llvm::ConstantInt::get(ResTy, 1);
3369 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3370 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3372 CodeGenFunction::ConditionalEvaluation eval(CGF);
3374 // Branch on the LHS first. If it is true, go to the success (cont) block.
3375 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3376 CGF.getCurrentProfileCount() -
3377 CGF.getProfileCount(E->getRHS()));
3379 // Any edges into the ContBlock are now from an (indeterminate number of)
3380 // edges from this first condition. All of these values will be true. Start
3381 // setting up the PHI node in the Cont Block for this.
3382 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3384 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3386 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3390 // Emit the RHS condition as a bool value.
3391 CGF.EmitBlock(RHSBlock);
3392 CGF.incrementProfileCounter(E);
3393 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3397 // Reaquire the RHS block, as there may be subblocks inserted.
3398 RHSBlock = Builder.GetInsertBlock();
3400 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3401 // into the phi node for the edge with the value of RHSCond.
3402 CGF.EmitBlock(ContBlock);
3403 PN->addIncoming(RHSCond, RHSBlock);
3405 // ZExt result to int.
3406 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3409 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3410 CGF.EmitIgnoredExpr(E->getLHS());
3411 CGF.EnsureInsertPoint();
3412 return Visit(E->getRHS());
3415 //===----------------------------------------------------------------------===//
3417 //===----------------------------------------------------------------------===//
3419 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3420 /// expression is cheap enough and side-effect-free enough to evaluate
3421 /// unconditionally instead of conditionally. This is used to convert control
3422 /// flow into selects in some cases.
3423 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3424 CodeGenFunction &CGF) {
3425 // Anything that is an integer or floating point constant is fine.
3426 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3428 // Even non-volatile automatic variables can't be evaluated unconditionally.
3429 // Referencing a thread_local may cause non-trivial initialization work to
3430 // occur. If we're inside a lambda and one of the variables is from the scope
3431 // outside the lambda, that function may have returned already. Reading its
3432 // locals is a bad idea. Also, these reads may introduce races there didn't
3433 // exist in the source-level program.
3437 Value *ScalarExprEmitter::
3438 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3439 TestAndClearIgnoreResultAssign();
3441 // Bind the common expression if necessary.
3442 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3444 Expr *condExpr = E->getCond();
3445 Expr *lhsExpr = E->getTrueExpr();
3446 Expr *rhsExpr = E->getFalseExpr();
3448 // If the condition constant folds and can be elided, try to avoid emitting
3449 // the condition and the dead arm.
3451 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3452 Expr *live = lhsExpr, *dead = rhsExpr;
3453 if (!CondExprBool) std::swap(live, dead);
3455 // If the dead side doesn't have labels we need, just emit the Live part.
3456 if (!CGF.ContainsLabel(dead)) {
3458 CGF.incrementProfileCounter(E);
3459 Value *Result = Visit(live);
3461 // If the live part is a throw expression, it acts like it has a void
3462 // type, so evaluating it returns a null Value*. However, a conditional
3463 // with non-void type must return a non-null Value*.
3464 if (!Result && !E->getType()->isVoidType())
3465 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3471 // OpenCL: If the condition is a vector, we can treat this condition like
3472 // the select function.
3473 if (CGF.getLangOpts().OpenCL
3474 && condExpr->getType()->isVectorType()) {
3475 CGF.incrementProfileCounter(E);
3477 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3478 llvm::Value *LHS = Visit(lhsExpr);
3479 llvm::Value *RHS = Visit(rhsExpr);
3481 llvm::Type *condType = ConvertType(condExpr->getType());
3482 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3484 unsigned numElem = vecTy->getNumElements();
3485 llvm::Type *elemType = vecTy->getElementType();
3487 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3488 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3489 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3490 llvm::VectorType::get(elemType,
3493 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3495 // Cast float to int to perform ANDs if necessary.
3496 llvm::Value *RHSTmp = RHS;
3497 llvm::Value *LHSTmp = LHS;
3498 bool wasCast = false;
3499 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3500 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3501 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3502 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3506 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3507 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3508 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3510 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3515 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3516 // select instead of as control flow. We can only do this if it is cheap and
3517 // safe to evaluate the LHS and RHS unconditionally.
3518 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3519 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3520 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3521 llvm::Value *StepV = Builder.CreateZExtOrBitCast(CondV, CGF.Int64Ty);
3523 CGF.incrementProfileCounter(E, StepV);
3525 llvm::Value *LHS = Visit(lhsExpr);
3526 llvm::Value *RHS = Visit(rhsExpr);
3528 // If the conditional has void type, make sure we return a null Value*.
3529 assert(!RHS && "LHS and RHS types must match");
3532 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3535 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3536 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3537 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3539 CodeGenFunction::ConditionalEvaluation eval(CGF);
3540 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
3541 CGF.getProfileCount(lhsExpr));
3543 CGF.EmitBlock(LHSBlock);
3544 CGF.incrementProfileCounter(E);
3546 Value *LHS = Visit(lhsExpr);
3549 LHSBlock = Builder.GetInsertBlock();
3550 Builder.CreateBr(ContBlock);
3552 CGF.EmitBlock(RHSBlock);
3554 Value *RHS = Visit(rhsExpr);
3557 RHSBlock = Builder.GetInsertBlock();
3558 CGF.EmitBlock(ContBlock);
3560 // If the LHS or RHS is a throw expression, it will be legitimately null.
3566 // Create a PHI node for the real part.
3567 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3568 PN->addIncoming(LHS, LHSBlock);
3569 PN->addIncoming(RHS, RHSBlock);
3573 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3574 return Visit(E->getChosenSubExpr());
3577 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3578 QualType Ty = VE->getType();
3580 if (Ty->isVariablyModifiedType())
3581 CGF.EmitVariablyModifiedType(Ty);
3583 Address ArgValue = Address::invalid();
3584 Address ArgPtr = CGF.EmitVAArg(VE, ArgValue);
3586 llvm::Type *ArgTy = ConvertType(VE->getType());
3588 // If EmitVAArg fails, emit an error.
3589 if (!ArgPtr.isValid()) {
3590 CGF.ErrorUnsupported(VE, "va_arg expression");
3591 return llvm::UndefValue::get(ArgTy);
3594 // FIXME Volatility.
3595 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3597 // If EmitVAArg promoted the type, we must truncate it.
3598 if (ArgTy != Val->getType()) {
3599 if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy())
3600 Val = Builder.CreateIntToPtr(Val, ArgTy);
3602 Val = Builder.CreateTrunc(Val, ArgTy);
3608 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3609 return CGF.EmitBlockLiteral(block);
3612 // Convert a vec3 to vec4, or vice versa.
3613 static Value *ConvertVec3AndVec4(CGBuilderTy &Builder, CodeGenFunction &CGF,
3614 Value *Src, unsigned NumElementsDst) {
3615 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3616 SmallVector<llvm::Constant*, 4> Args;
3617 Args.push_back(Builder.getInt32(0));
3618 Args.push_back(Builder.getInt32(1));
3619 Args.push_back(Builder.getInt32(2));
3620 if (NumElementsDst == 4)
3621 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3622 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3623 return Builder.CreateShuffleVector(Src, UnV, Mask);
3626 // Create cast instructions for converting LLVM value \p Src to LLVM type \p
3627 // DstTy. \p Src has the same size as \p DstTy. Both are single value types
3628 // but could be scalar or vectors of different lengths, and either can be
3630 // There are 4 cases:
3631 // 1. non-pointer -> non-pointer : needs 1 bitcast
3632 // 2. pointer -> pointer : needs 1 bitcast or addrspacecast
3633 // 3. pointer -> non-pointer
3634 // a) pointer -> intptr_t : needs 1 ptrtoint
3635 // b) pointer -> non-intptr_t : needs 1 ptrtoint then 1 bitcast
3636 // 4. non-pointer -> pointer
3637 // a) intptr_t -> pointer : needs 1 inttoptr
3638 // b) non-intptr_t -> pointer : needs 1 bitcast then 1 inttoptr
3639 // Note: for cases 3b and 4b two casts are required since LLVM casts do not
3640 // allow casting directly between pointer types and non-integer non-pointer
3642 static Value *createCastsForTypeOfSameSize(CGBuilderTy &Builder,
3643 const llvm::DataLayout &DL,
3644 Value *Src, llvm::Type *DstTy,
3645 StringRef Name = "") {
3646 auto SrcTy = Src->getType();
3649 if (!SrcTy->isPointerTy() && !DstTy->isPointerTy())
3650 return Builder.CreateBitCast(Src, DstTy, Name);
3653 if (SrcTy->isPointerTy() && DstTy->isPointerTy())
3654 return Builder.CreatePointerBitCastOrAddrSpaceCast(Src, DstTy, Name);
3657 if (SrcTy->isPointerTy() && !DstTy->isPointerTy()) {
3659 if (!DstTy->isIntegerTy())
3660 Src = Builder.CreatePtrToInt(Src, DL.getIntPtrType(SrcTy));
3662 return Builder.CreateBitOrPointerCast(Src, DstTy, Name);
3666 if (!SrcTy->isIntegerTy())
3667 Src = Builder.CreateBitCast(Src, DL.getIntPtrType(DstTy));
3669 return Builder.CreateIntToPtr(Src, DstTy, Name);
3672 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3673 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3674 llvm::Type *DstTy = ConvertType(E->getType());
3676 llvm::Type *SrcTy = Src->getType();
3677 unsigned NumElementsSrc = isa<llvm::VectorType>(SrcTy) ?
3678 cast<llvm::VectorType>(SrcTy)->getNumElements() : 0;
3679 unsigned NumElementsDst = isa<llvm::VectorType>(DstTy) ?
3680 cast<llvm::VectorType>(DstTy)->getNumElements() : 0;
3682 // Going from vec3 to non-vec3 is a special case and requires a shuffle
3683 // vector to get a vec4, then a bitcast if the target type is different.
3684 if (NumElementsSrc == 3 && NumElementsDst != 3) {
3685 Src = ConvertVec3AndVec4(Builder, CGF, Src, 4);
3687 if (!CGF.CGM.getCodeGenOpts().PreserveVec3Type) {
3688 Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src,
3692 Src->setName("astype");
3696 // Going from non-vec3 to vec3 is a special case and requires a bitcast
3697 // to vec4 if the original type is not vec4, then a shuffle vector to
3699 if (NumElementsSrc != 3 && NumElementsDst == 3) {
3700 if (!CGF.CGM.getCodeGenOpts().PreserveVec3Type) {
3701 auto Vec4Ty = llvm::VectorType::get(DstTy->getVectorElementType(), 4);
3702 Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src,
3706 Src = ConvertVec3AndVec4(Builder, CGF, Src, 3);
3707 Src->setName("astype");
3711 return Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(),
3712 Src, DstTy, "astype");
3715 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3716 return CGF.EmitAtomicExpr(E).getScalarVal();
3719 //===----------------------------------------------------------------------===//
3720 // Entry Point into this File
3721 //===----------------------------------------------------------------------===//
3723 /// Emit the computation of the specified expression of scalar type, ignoring
3725 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3726 assert(E && hasScalarEvaluationKind(E->getType()) &&
3727 "Invalid scalar expression to emit");
3729 return ScalarExprEmitter(*this, IgnoreResultAssign)
3730 .Visit(const_cast<Expr *>(E));
3733 /// Emit a conversion from the specified type to the specified destination type,
3734 /// both of which are LLVM scalar types.
3735 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3737 SourceLocation Loc) {
3738 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3739 "Invalid scalar expression to emit");
3740 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc);
3743 /// Emit a conversion from the specified complex type to the specified
3744 /// destination type, where the destination type is an LLVM scalar type.
3745 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3748 SourceLocation Loc) {
3749 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3750 "Invalid complex -> scalar conversion");
3751 return ScalarExprEmitter(*this)
3752 .EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc);
3756 llvm::Value *CodeGenFunction::
3757 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3758 bool isInc, bool isPre) {
3759 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3762 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3763 // object->isa or (*object).isa
3764 // Generate code as for: *(Class*)object
3766 Expr *BaseExpr = E->getBase();
3767 Address Addr = Address::invalid();
3768 if (BaseExpr->isRValue()) {
3769 Addr = Address(EmitScalarExpr(BaseExpr), getPointerAlign());
3771 Addr = EmitLValue(BaseExpr).getAddress();
3774 // Cast the address to Class*.
3775 Addr = Builder.CreateElementBitCast(Addr, ConvertType(E->getType()));
3776 return MakeAddrLValue(Addr, E->getType());
3780 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3781 const CompoundAssignOperator *E) {
3782 ScalarExprEmitter Scalar(*this);
3783 Value *Result = nullptr;
3784 switch (E->getOpcode()) {
3785 #define COMPOUND_OP(Op) \
3786 case BO_##Op##Assign: \
3787 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3823 llvm_unreachable("Not valid compound assignment operators");
3826 llvm_unreachable("Unhandled compound assignment operator");