1 //===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This contains code to emit Expr nodes with scalar LLVM types as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
16 #include "CGDebugInfo.h"
17 #include "CGObjCRuntime.h"
18 #include "CodeGenModule.h"
19 #include "TargetInfo.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/RecordLayout.h"
24 #include "clang/AST/StmtVisitor.h"
25 #include "clang/Basic/TargetInfo.h"
26 #include "clang/Frontend/CodeGenOptions.h"
27 #include "llvm/IR/CFG.h"
28 #include "llvm/IR/Constants.h"
29 #include "llvm/IR/DataLayout.h"
30 #include "llvm/IR/Function.h"
31 #include "llvm/IR/GlobalVariable.h"
32 #include "llvm/IR/Intrinsics.h"
33 #include "llvm/IR/Module.h"
36 using namespace clang;
37 using namespace CodeGen;
40 //===----------------------------------------------------------------------===//
41 // Scalar Expression Emitter
42 //===----------------------------------------------------------------------===//
48 QualType Ty; // Computation Type.
49 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
51 const Expr *E; // Entire expr, for error unsupported. May not be binop.
54 static bool MustVisitNullValue(const Expr *E) {
55 // If a null pointer expression's type is the C++0x nullptr_t, then
56 // it's not necessarily a simple constant and it must be evaluated
57 // for its potential side effects.
58 return E->getType()->isNullPtrType();
61 class ScalarExprEmitter
62 : public StmtVisitor<ScalarExprEmitter, Value*> {
65 bool IgnoreResultAssign;
66 llvm::LLVMContext &VMContext;
69 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
70 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
71 VMContext(cgf.getLLVMContext()) {
74 //===--------------------------------------------------------------------===//
76 //===--------------------------------------------------------------------===//
78 bool TestAndClearIgnoreResultAssign() {
79 bool I = IgnoreResultAssign;
80 IgnoreResultAssign = false;
84 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
85 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
86 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
87 return CGF.EmitCheckedLValue(E, TCK);
90 void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks,
91 const BinOpInfo &Info);
93 Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
94 return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
97 void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
98 const AlignValueAttr *AVAttr = nullptr;
99 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
100 const ValueDecl *VD = DRE->getDecl();
102 if (VD->getType()->isReferenceType()) {
103 if (const auto *TTy =
104 dyn_cast<TypedefType>(VD->getType().getNonReferenceType()))
105 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
107 // Assumptions for function parameters are emitted at the start of the
108 // function, so there is no need to repeat that here.
109 if (isa<ParmVarDecl>(VD))
112 AVAttr = VD->getAttr<AlignValueAttr>();
117 if (const auto *TTy =
118 dyn_cast<TypedefType>(E->getType()))
119 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
124 Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
125 llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
126 CGF.EmitAlignmentAssumption(V, AlignmentCI->getZExtValue());
129 /// EmitLoadOfLValue - Given an expression with complex type that represents a
130 /// value l-value, this method emits the address of the l-value, then loads
131 /// and returns the result.
132 Value *EmitLoadOfLValue(const Expr *E) {
133 Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
136 EmitLValueAlignmentAssumption(E, V);
140 /// EmitConversionToBool - Convert the specified expression value to a
141 /// boolean (i1) truth value. This is equivalent to "Val != 0".
142 Value *EmitConversionToBool(Value *Src, QualType DstTy);
144 /// Emit a check that a conversion to or from a floating-point type does not
146 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
147 Value *Src, QualType SrcType, QualType DstType,
148 llvm::Type *DstTy, SourceLocation Loc);
150 /// Emit a conversion from the specified type to the specified destination
151 /// type, both of which are LLVM scalar types.
152 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
155 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
156 SourceLocation Loc, bool TreatBooleanAsSigned);
158 /// Emit a conversion from the specified complex type to the specified
159 /// destination type, where the destination type is an LLVM scalar type.
160 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
161 QualType SrcTy, QualType DstTy,
164 /// EmitNullValue - Emit a value that corresponds to null for the given type.
165 Value *EmitNullValue(QualType Ty);
167 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
168 Value *EmitFloatToBoolConversion(Value *V) {
169 // Compare against 0.0 for fp scalars.
170 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
171 return Builder.CreateFCmpUNE(V, Zero, "tobool");
174 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
175 Value *EmitPointerToBoolConversion(Value *V, QualType QT) {
176 Value *Zero = CGF.CGM.getNullPointer(cast<llvm::PointerType>(V->getType()), QT);
178 return Builder.CreateICmpNE(V, Zero, "tobool");
181 Value *EmitIntToBoolConversion(Value *V) {
182 // Because of the type rules of C, we often end up computing a
183 // logical value, then zero extending it to int, then wanting it
184 // as a logical value again. Optimize this common case.
185 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
186 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
187 Value *Result = ZI->getOperand(0);
188 // If there aren't any more uses, zap the instruction to save space.
189 // Note that there can be more uses, for example if this
190 // is the result of an assignment.
192 ZI->eraseFromParent();
197 return Builder.CreateIsNotNull(V, "tobool");
200 //===--------------------------------------------------------------------===//
202 //===--------------------------------------------------------------------===//
204 Value *Visit(Expr *E) {
205 ApplyDebugLocation DL(CGF, E);
206 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
209 Value *VisitStmt(Stmt *S) {
210 S->dump(CGF.getContext().getSourceManager());
211 llvm_unreachable("Stmt can't have complex result type!");
213 Value *VisitExpr(Expr *S);
215 Value *VisitParenExpr(ParenExpr *PE) {
216 return Visit(PE->getSubExpr());
218 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
219 return Visit(E->getReplacement());
221 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
222 return Visit(GE->getResultExpr());
226 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
227 return Builder.getInt(E->getValue());
229 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
230 return llvm::ConstantFP::get(VMContext, E->getValue());
232 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
233 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
235 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
236 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
238 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
239 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
241 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
242 return EmitNullValue(E->getType());
244 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
245 return EmitNullValue(E->getType());
247 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
248 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
249 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
250 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
251 return Builder.CreateBitCast(V, ConvertType(E->getType()));
254 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
255 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
258 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
259 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
262 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
264 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E), E->getExprLoc());
266 // Otherwise, assume the mapping is the scalar directly.
267 return CGF.getOpaqueRValueMapping(E).getScalarVal();
271 Value *VisitDeclRefExpr(DeclRefExpr *E) {
272 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
273 if (result.isReference())
274 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E),
276 return result.getValue();
278 return EmitLoadOfLValue(E);
281 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
282 return CGF.EmitObjCSelectorExpr(E);
284 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
285 return CGF.EmitObjCProtocolExpr(E);
287 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
288 return EmitLoadOfLValue(E);
290 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
291 if (E->getMethodDecl() &&
292 E->getMethodDecl()->getReturnType()->isReferenceType())
293 return EmitLoadOfLValue(E);
294 return CGF.EmitObjCMessageExpr(E).getScalarVal();
297 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
298 LValue LV = CGF.EmitObjCIsaExpr(E);
299 Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
303 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
304 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
305 Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
306 Value *VisitMemberExpr(MemberExpr *E);
307 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
308 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
309 return EmitLoadOfLValue(E);
312 Value *VisitInitListExpr(InitListExpr *E);
314 Value *VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) {
315 assert(CGF.getArrayInitIndex() &&
316 "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?");
317 return CGF.getArrayInitIndex();
320 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
321 return EmitNullValue(E->getType());
323 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
324 CGF.CGM.EmitExplicitCastExprType(E, &CGF);
325 return VisitCastExpr(E);
327 Value *VisitCastExpr(CastExpr *E);
329 Value *VisitCallExpr(const CallExpr *E) {
330 if (E->getCallReturnType(CGF.getContext())->isReferenceType())
331 return EmitLoadOfLValue(E);
333 Value *V = CGF.EmitCallExpr(E).getScalarVal();
335 EmitLValueAlignmentAssumption(E, V);
339 Value *VisitStmtExpr(const StmtExpr *E);
342 Value *VisitUnaryPostDec(const UnaryOperator *E) {
343 LValue LV = EmitLValue(E->getSubExpr());
344 return EmitScalarPrePostIncDec(E, LV, false, false);
346 Value *VisitUnaryPostInc(const UnaryOperator *E) {
347 LValue LV = EmitLValue(E->getSubExpr());
348 return EmitScalarPrePostIncDec(E, LV, true, false);
350 Value *VisitUnaryPreDec(const UnaryOperator *E) {
351 LValue LV = EmitLValue(E->getSubExpr());
352 return EmitScalarPrePostIncDec(E, LV, false, true);
354 Value *VisitUnaryPreInc(const UnaryOperator *E) {
355 LValue LV = EmitLValue(E->getSubExpr());
356 return EmitScalarPrePostIncDec(E, LV, true, true);
359 llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E,
363 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
364 bool isInc, bool isPre);
367 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
368 if (isa<MemberPointerType>(E->getType())) // never sugared
369 return CGF.CGM.getMemberPointerConstant(E);
371 return EmitLValue(E->getSubExpr()).getPointer();
373 Value *VisitUnaryDeref(const UnaryOperator *E) {
374 if (E->getType()->isVoidType())
375 return Visit(E->getSubExpr()); // the actual value should be unused
376 return EmitLoadOfLValue(E);
378 Value *VisitUnaryPlus(const UnaryOperator *E) {
379 // This differs from gcc, though, most likely due to a bug in gcc.
380 TestAndClearIgnoreResultAssign();
381 return Visit(E->getSubExpr());
383 Value *VisitUnaryMinus (const UnaryOperator *E);
384 Value *VisitUnaryNot (const UnaryOperator *E);
385 Value *VisitUnaryLNot (const UnaryOperator *E);
386 Value *VisitUnaryReal (const UnaryOperator *E);
387 Value *VisitUnaryImag (const UnaryOperator *E);
388 Value *VisitUnaryExtension(const UnaryOperator *E) {
389 return Visit(E->getSubExpr());
393 Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
394 return EmitLoadOfLValue(E);
397 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
398 return Visit(DAE->getExpr());
400 Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
401 CodeGenFunction::CXXDefaultInitExprScope Scope(CGF);
402 return Visit(DIE->getExpr());
404 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
405 return CGF.LoadCXXThis();
408 Value *VisitExprWithCleanups(ExprWithCleanups *E) {
409 CGF.enterFullExpression(E);
410 CodeGenFunction::RunCleanupsScope Scope(CGF);
411 return Visit(E->getSubExpr());
413 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
414 return CGF.EmitCXXNewExpr(E);
416 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
417 CGF.EmitCXXDeleteExpr(E);
421 Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
422 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
425 Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
426 return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue());
429 Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
430 return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
433 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
434 // C++ [expr.pseudo]p1:
435 // The result shall only be used as the operand for the function call
436 // operator (), and the result of such a call has type void. The only
437 // effect is the evaluation of the postfix-expression before the dot or
439 CGF.EmitScalarExpr(E->getBase());
443 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
444 return EmitNullValue(E->getType());
447 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
448 CGF.EmitCXXThrowExpr(E);
452 Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
453 return Builder.getInt1(E->getValue());
457 Value *EmitMul(const BinOpInfo &Ops) {
458 if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
459 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
460 case LangOptions::SOB_Defined:
461 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
462 case LangOptions::SOB_Undefined:
463 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
464 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
466 case LangOptions::SOB_Trapping:
467 return EmitOverflowCheckedBinOp(Ops);
471 if (Ops.Ty->isUnsignedIntegerType() &&
472 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
473 return EmitOverflowCheckedBinOp(Ops);
475 if (Ops.LHS->getType()->isFPOrFPVectorTy())
476 return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
477 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
479 /// Create a binary op that checks for overflow.
480 /// Currently only supports +, - and *.
481 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
483 // Check for undefined division and modulus behaviors.
484 void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
485 llvm::Value *Zero,bool isDiv);
486 // Common helper for getting how wide LHS of shift is.
487 static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS);
488 Value *EmitDiv(const BinOpInfo &Ops);
489 Value *EmitRem(const BinOpInfo &Ops);
490 Value *EmitAdd(const BinOpInfo &Ops);
491 Value *EmitSub(const BinOpInfo &Ops);
492 Value *EmitShl(const BinOpInfo &Ops);
493 Value *EmitShr(const BinOpInfo &Ops);
494 Value *EmitAnd(const BinOpInfo &Ops) {
495 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
497 Value *EmitXor(const BinOpInfo &Ops) {
498 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
500 Value *EmitOr (const BinOpInfo &Ops) {
501 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
504 BinOpInfo EmitBinOps(const BinaryOperator *E);
505 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
506 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
509 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
510 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
512 // Binary operators and binary compound assignment operators.
513 #define HANDLEBINOP(OP) \
514 Value *VisitBin ## OP(const BinaryOperator *E) { \
515 return Emit ## OP(EmitBinOps(E)); \
517 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
518 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
533 Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc,
534 llvm::CmpInst::Predicate SICmpOpc,
535 llvm::CmpInst::Predicate FCmpOpc);
536 #define VISITCOMP(CODE, UI, SI, FP) \
537 Value *VisitBin##CODE(const BinaryOperator *E) { \
538 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
539 llvm::FCmpInst::FP); }
540 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
541 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
542 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
543 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
544 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
545 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
548 Value *VisitBinAssign (const BinaryOperator *E);
550 Value *VisitBinLAnd (const BinaryOperator *E);
551 Value *VisitBinLOr (const BinaryOperator *E);
552 Value *VisitBinComma (const BinaryOperator *E);
554 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
555 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
558 Value *VisitBlockExpr(const BlockExpr *BE);
559 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
560 Value *VisitChooseExpr(ChooseExpr *CE);
561 Value *VisitVAArgExpr(VAArgExpr *VE);
562 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
563 return CGF.EmitObjCStringLiteral(E);
565 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
566 return CGF.EmitObjCBoxedExpr(E);
568 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
569 return CGF.EmitObjCArrayLiteral(E);
571 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
572 return CGF.EmitObjCDictionaryLiteral(E);
574 Value *VisitAsTypeExpr(AsTypeExpr *CE);
575 Value *VisitAtomicExpr(AtomicExpr *AE);
577 } // end anonymous namespace.
579 //===----------------------------------------------------------------------===//
581 //===----------------------------------------------------------------------===//
583 /// EmitConversionToBool - Convert the specified expression value to a
584 /// boolean (i1) truth value. This is equivalent to "Val != 0".
585 Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
586 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
588 if (SrcType->isRealFloatingType())
589 return EmitFloatToBoolConversion(Src);
591 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
592 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
594 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
595 "Unknown scalar type to convert");
597 if (isa<llvm::IntegerType>(Src->getType()))
598 return EmitIntToBoolConversion(Src);
600 assert(isa<llvm::PointerType>(Src->getType()));
601 return EmitPointerToBoolConversion(Src, SrcType);
604 void ScalarExprEmitter::EmitFloatConversionCheck(
605 Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType,
606 QualType DstType, llvm::Type *DstTy, SourceLocation Loc) {
607 CodeGenFunction::SanitizerScope SanScope(&CGF);
611 llvm::Type *SrcTy = Src->getType();
613 llvm::Value *Check = nullptr;
614 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
615 // Integer to floating-point. This can fail for unsigned short -> __half
616 // or unsigned __int128 -> float.
617 assert(DstType->isFloatingType());
618 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
620 APFloat LargestFloat =
621 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
622 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
625 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
626 &IsExact) != APFloat::opOK)
627 // The range of representable values of this floating point type includes
628 // all values of this integer type. Don't need an overflow check.
631 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
633 Check = Builder.CreateICmpULE(Src, Max);
635 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
636 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
637 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
638 Check = Builder.CreateAnd(GE, LE);
641 const llvm::fltSemantics &SrcSema =
642 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
643 if (isa<llvm::IntegerType>(DstTy)) {
644 // Floating-point to integer. This has undefined behavior if the source is
645 // +-Inf, NaN, or doesn't fit into the destination type (after truncation
647 unsigned Width = CGF.getContext().getIntWidth(DstType);
648 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
650 APSInt Min = APSInt::getMinValue(Width, Unsigned);
651 APFloat MinSrc(SrcSema, APFloat::uninitialized);
652 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
654 // Don't need an overflow check for lower bound. Just check for
656 MinSrc = APFloat::getInf(SrcSema, true);
658 // Find the largest value which is too small to represent (before
659 // truncation toward zero).
660 MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
662 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
663 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
664 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
666 // Don't need an overflow check for upper bound. Just check for
668 MaxSrc = APFloat::getInf(SrcSema, false);
670 // Find the smallest value which is too large to represent (before
671 // truncation toward zero).
672 MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
674 // If we're converting from __half, convert the range to float to match
676 if (OrigSrcType->isHalfType()) {
677 const llvm::fltSemantics &Sema =
678 CGF.getContext().getFloatTypeSemantics(SrcType);
680 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
681 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
685 Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
687 Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
688 Check = Builder.CreateAnd(GE, LE);
690 // FIXME: Maybe split this sanitizer out from float-cast-overflow.
692 // Floating-point to floating-point. This has undefined behavior if the
693 // source is not in the range of representable values of the destination
694 // type. The C and C++ standards are spectacularly unclear here. We
695 // diagnose finite out-of-range conversions, but allow infinities and NaNs
696 // to convert to the corresponding value in the smaller type.
698 // C11 Annex F gives all such conversions defined behavior for IEC 60559
699 // conforming implementations. Unfortunately, LLVM's fptrunc instruction
702 // Converting from a lower rank to a higher rank can never have
703 // undefined behavior, since higher-rank types must have a superset
704 // of values of lower-rank types.
705 if (CGF.getContext().getFloatingTypeOrder(OrigSrcType, DstType) != 1)
708 assert(!OrigSrcType->isHalfType() &&
709 "should not check conversion from __half, it has the lowest rank");
711 const llvm::fltSemantics &DstSema =
712 CGF.getContext().getFloatTypeSemantics(DstType);
713 APFloat MinBad = APFloat::getLargest(DstSema, false);
714 APFloat MaxBad = APFloat::getInf(DstSema, false);
717 MinBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
718 MaxBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
720 Value *AbsSrc = CGF.EmitNounwindRuntimeCall(
721 CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Src->getType()), Src);
723 Builder.CreateFCmpOGT(AbsSrc, llvm::ConstantFP::get(VMContext, MinBad));
725 Builder.CreateFCmpOLT(AbsSrc, llvm::ConstantFP::get(VMContext, MaxBad));
726 Check = Builder.CreateNot(Builder.CreateAnd(GE, LE));
730 llvm::Constant *StaticArgs[] = {CGF.EmitCheckSourceLocation(Loc),
731 CGF.EmitCheckTypeDescriptor(OrigSrcType),
732 CGF.EmitCheckTypeDescriptor(DstType)};
733 CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow),
734 SanitizerHandler::FloatCastOverflow, StaticArgs, OrigSrc);
737 /// Emit a conversion from the specified type to the specified destination type,
738 /// both of which are LLVM scalar types.
739 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
741 SourceLocation Loc) {
742 return EmitScalarConversion(Src, SrcType, DstType, Loc, false);
745 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
748 bool TreatBooleanAsSigned) {
749 SrcType = CGF.getContext().getCanonicalType(SrcType);
750 DstType = CGF.getContext().getCanonicalType(DstType);
751 if (SrcType == DstType) return Src;
753 if (DstType->isVoidType()) return nullptr;
755 llvm::Value *OrigSrc = Src;
756 QualType OrigSrcType = SrcType;
757 llvm::Type *SrcTy = Src->getType();
759 // Handle conversions to bool first, they are special: comparisons against 0.
760 if (DstType->isBooleanType())
761 return EmitConversionToBool(Src, SrcType);
763 llvm::Type *DstTy = ConvertType(DstType);
765 // Cast from half through float if half isn't a native type.
766 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
767 // Cast to FP using the intrinsic if the half type itself isn't supported.
768 if (DstTy->isFloatingPointTy()) {
769 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
770 return Builder.CreateCall(
771 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy),
774 // Cast to other types through float, using either the intrinsic or FPExt,
775 // depending on whether the half type itself is supported
776 // (as opposed to operations on half, available with NativeHalfType).
777 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
778 Src = Builder.CreateCall(
779 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
783 Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv");
785 SrcType = CGF.getContext().FloatTy;
790 // Ignore conversions like int -> uint.
794 // Handle pointer conversions next: pointers can only be converted to/from
795 // other pointers and integers. Check for pointer types in terms of LLVM, as
796 // some native types (like Obj-C id) may map to a pointer type.
797 if (auto DstPT = dyn_cast<llvm::PointerType>(DstTy)) {
798 // The source value may be an integer, or a pointer.
799 if (isa<llvm::PointerType>(SrcTy))
800 return Builder.CreateBitCast(Src, DstTy, "conv");
802 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
803 // First, convert to the correct width so that we control the kind of
805 llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DstPT);
806 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
807 llvm::Value* IntResult =
808 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
809 // Then, cast to pointer.
810 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
813 if (isa<llvm::PointerType>(SrcTy)) {
814 // Must be an ptr to int cast.
815 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
816 return Builder.CreatePtrToInt(Src, DstTy, "conv");
819 // A scalar can be splatted to an extended vector of the same element type
820 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
821 // Sema should add casts to make sure that the source expression's type is
822 // the same as the vector's element type (sans qualifiers)
823 assert(DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() ==
824 SrcType.getTypePtr() &&
825 "Splatted expr doesn't match with vector element type?");
827 // Splat the element across to all elements
828 unsigned NumElements = DstTy->getVectorNumElements();
829 return Builder.CreateVectorSplat(NumElements, Src, "splat");
832 // Allow bitcast from vector to integer/fp of the same size.
833 if (isa<llvm::VectorType>(SrcTy) ||
834 isa<llvm::VectorType>(DstTy))
835 return Builder.CreateBitCast(Src, DstTy, "conv");
837 // Finally, we have the arithmetic types: real int/float.
838 Value *Res = nullptr;
839 llvm::Type *ResTy = DstTy;
841 // An overflowing conversion has undefined behavior if either the source type
842 // or the destination type is a floating-point type.
843 if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) &&
844 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
845 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType, DstTy,
848 // Cast to half through float if half isn't a native type.
849 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
850 // Make sure we cast in a single step if from another FP type.
851 if (SrcTy->isFloatingPointTy()) {
852 // Use the intrinsic if the half type itself isn't supported
853 // (as opposed to operations on half, available with NativeHalfType).
854 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
855 return Builder.CreateCall(
856 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src);
857 // If the half type is supported, just use an fptrunc.
858 return Builder.CreateFPTrunc(Src, DstTy);
863 if (isa<llvm::IntegerType>(SrcTy)) {
864 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
865 if (SrcType->isBooleanType() && TreatBooleanAsSigned) {
868 if (isa<llvm::IntegerType>(DstTy))
869 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
870 else if (InputSigned)
871 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
873 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
874 } else if (isa<llvm::IntegerType>(DstTy)) {
875 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
876 if (DstType->isSignedIntegerOrEnumerationType())
877 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
879 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
881 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
882 "Unknown real conversion");
883 if (DstTy->getTypeID() < SrcTy->getTypeID())
884 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
886 Res = Builder.CreateFPExt(Src, DstTy, "conv");
889 if (DstTy != ResTy) {
890 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
891 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
892 Res = Builder.CreateCall(
893 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy),
896 Res = Builder.CreateFPTrunc(Res, ResTy, "conv");
903 /// Emit a conversion from the specified complex type to the specified
904 /// destination type, where the destination type is an LLVM scalar type.
905 Value *ScalarExprEmitter::EmitComplexToScalarConversion(
906 CodeGenFunction::ComplexPairTy Src, QualType SrcTy, QualType DstTy,
907 SourceLocation Loc) {
908 // Get the source element type.
909 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
911 // Handle conversions to bool first, they are special: comparisons against 0.
912 if (DstTy->isBooleanType()) {
913 // Complex != 0 -> (Real != 0) | (Imag != 0)
914 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
915 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy, Loc);
916 return Builder.CreateOr(Src.first, Src.second, "tobool");
919 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
920 // the imaginary part of the complex value is discarded and the value of the
921 // real part is converted according to the conversion rules for the
922 // corresponding real type.
923 return EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
926 Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
927 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
930 /// \brief Emit a sanitization check for the given "binary" operation (which
931 /// might actually be a unary increment which has been lowered to a binary
932 /// operation). The check passes if all values in \p Checks (which are \c i1),
934 void ScalarExprEmitter::EmitBinOpCheck(
935 ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) {
936 assert(CGF.IsSanitizerScope);
937 SanitizerHandler Check;
938 SmallVector<llvm::Constant *, 4> StaticData;
939 SmallVector<llvm::Value *, 2> DynamicData;
941 BinaryOperatorKind Opcode = Info.Opcode;
942 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
943 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
945 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
946 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
947 if (UO && UO->getOpcode() == UO_Minus) {
948 Check = SanitizerHandler::NegateOverflow;
949 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
950 DynamicData.push_back(Info.RHS);
952 if (BinaryOperator::isShiftOp(Opcode)) {
953 // Shift LHS negative or too large, or RHS out of bounds.
954 Check = SanitizerHandler::ShiftOutOfBounds;
955 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
956 StaticData.push_back(
957 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
958 StaticData.push_back(
959 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
960 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
961 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
962 Check = SanitizerHandler::DivremOverflow;
963 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
965 // Arithmetic overflow (+, -, *).
967 case BO_Add: Check = SanitizerHandler::AddOverflow; break;
968 case BO_Sub: Check = SanitizerHandler::SubOverflow; break;
969 case BO_Mul: Check = SanitizerHandler::MulOverflow; break;
970 default: llvm_unreachable("unexpected opcode for bin op check");
972 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
974 DynamicData.push_back(Info.LHS);
975 DynamicData.push_back(Info.RHS);
978 CGF.EmitCheck(Checks, Check, StaticData, DynamicData);
981 //===----------------------------------------------------------------------===//
983 //===----------------------------------------------------------------------===//
985 Value *ScalarExprEmitter::VisitExpr(Expr *E) {
986 CGF.ErrorUnsupported(E, "scalar expression");
987 if (E->getType()->isVoidType())
989 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
992 Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
994 if (E->getNumSubExprs() == 2) {
995 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
996 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
999 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
1000 unsigned LHSElts = LTy->getNumElements();
1004 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
1006 // Mask off the high bits of each shuffle index.
1008 llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1);
1009 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
1012 // mask = mask & maskbits
1014 // n = extract mask i
1015 // x = extract val n
1016 // newv = insert newv, x, i
1017 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
1018 MTy->getNumElements());
1019 Value* NewV = llvm::UndefValue::get(RTy);
1020 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
1021 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
1022 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
1024 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
1025 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
1030 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
1031 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
1033 SmallVector<llvm::Constant*, 32> indices;
1034 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
1035 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
1036 // Check for -1 and output it as undef in the IR.
1037 if (Idx.isSigned() && Idx.isAllOnesValue())
1038 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
1040 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
1043 Value *SV = llvm::ConstantVector::get(indices);
1044 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
1047 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
1048 QualType SrcType = E->getSrcExpr()->getType(),
1049 DstType = E->getType();
1051 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
1053 SrcType = CGF.getContext().getCanonicalType(SrcType);
1054 DstType = CGF.getContext().getCanonicalType(DstType);
1055 if (SrcType == DstType) return Src;
1057 assert(SrcType->isVectorType() &&
1058 "ConvertVector source type must be a vector");
1059 assert(DstType->isVectorType() &&
1060 "ConvertVector destination type must be a vector");
1062 llvm::Type *SrcTy = Src->getType();
1063 llvm::Type *DstTy = ConvertType(DstType);
1065 // Ignore conversions like int -> uint.
1069 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
1070 DstEltType = DstType->getAs<VectorType>()->getElementType();
1072 assert(SrcTy->isVectorTy() &&
1073 "ConvertVector source IR type must be a vector");
1074 assert(DstTy->isVectorTy() &&
1075 "ConvertVector destination IR type must be a vector");
1077 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1078 *DstEltTy = DstTy->getVectorElementType();
1080 if (DstEltType->isBooleanType()) {
1081 assert((SrcEltTy->isFloatingPointTy() ||
1082 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1084 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1085 if (SrcEltTy->isFloatingPointTy()) {
1086 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1088 return Builder.CreateICmpNE(Src, Zero, "tobool");
1092 // We have the arithmetic types: real int/float.
1093 Value *Res = nullptr;
1095 if (isa<llvm::IntegerType>(SrcEltTy)) {
1096 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1097 if (isa<llvm::IntegerType>(DstEltTy))
1098 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1099 else if (InputSigned)
1100 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1102 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1103 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1104 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1105 if (DstEltType->isSignedIntegerOrEnumerationType())
1106 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1108 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1110 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1111 "Unknown real conversion");
1112 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1113 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1115 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1121 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1123 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1125 CGF.EmitScalarExpr(E->getBase());
1127 EmitLValue(E->getBase());
1128 return Builder.getInt(Value);
1131 return EmitLoadOfLValue(E);
1134 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1135 TestAndClearIgnoreResultAssign();
1137 // Emit subscript expressions in rvalue context's. For most cases, this just
1138 // loads the lvalue formed by the subscript expr. However, we have to be
1139 // careful, because the base of a vector subscript is occasionally an rvalue,
1140 // so we can't get it as an lvalue.
1141 if (!E->getBase()->getType()->isVectorType())
1142 return EmitLoadOfLValue(E);
1144 // Handle the vector case. The base must be a vector, the index must be an
1146 Value *Base = Visit(E->getBase());
1147 Value *Idx = Visit(E->getIdx());
1148 QualType IdxTy = E->getIdx()->getType();
1150 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
1151 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1153 return Builder.CreateExtractElement(Base, Idx, "vecext");
1156 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1157 unsigned Off, llvm::Type *I32Ty) {
1158 int MV = SVI->getMaskValue(Idx);
1160 return llvm::UndefValue::get(I32Ty);
1161 return llvm::ConstantInt::get(I32Ty, Off+MV);
1164 static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) {
1165 if (C->getBitWidth() != 32) {
1166 assert(llvm::ConstantInt::isValueValidForType(I32Ty,
1167 C->getZExtValue()) &&
1168 "Index operand too large for shufflevector mask!");
1169 return llvm::ConstantInt::get(I32Ty, C->getZExtValue());
1174 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1175 bool Ignore = TestAndClearIgnoreResultAssign();
1177 assert (Ignore == false && "init list ignored");
1178 unsigned NumInitElements = E->getNumInits();
1180 if (E->hadArrayRangeDesignator())
1181 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1183 llvm::VectorType *VType =
1184 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1187 if (NumInitElements == 0) {
1188 // C++11 value-initialization for the scalar.
1189 return EmitNullValue(E->getType());
1191 // We have a scalar in braces. Just use the first element.
1192 return Visit(E->getInit(0));
1195 unsigned ResElts = VType->getNumElements();
1197 // Loop over initializers collecting the Value for each, and remembering
1198 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1199 // us to fold the shuffle for the swizzle into the shuffle for the vector
1200 // initializer, since LLVM optimizers generally do not want to touch
1202 unsigned CurIdx = 0;
1203 bool VIsUndefShuffle = false;
1204 llvm::Value *V = llvm::UndefValue::get(VType);
1205 for (unsigned i = 0; i != NumInitElements; ++i) {
1206 Expr *IE = E->getInit(i);
1207 Value *Init = Visit(IE);
1208 SmallVector<llvm::Constant*, 16> Args;
1210 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1212 // Handle scalar elements. If the scalar initializer is actually one
1213 // element of a different vector of the same width, use shuffle instead of
1216 if (isa<ExtVectorElementExpr>(IE)) {
1217 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1219 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1220 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1221 Value *LHS = nullptr, *RHS = nullptr;
1223 // insert into undef -> shuffle (src, undef)
1224 // shufflemask must use an i32
1225 Args.push_back(getAsInt32(C, CGF.Int32Ty));
1226 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1228 LHS = EI->getVectorOperand();
1230 VIsUndefShuffle = true;
1231 } else if (VIsUndefShuffle) {
1232 // insert into undefshuffle && size match -> shuffle (v, src)
1233 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1234 for (unsigned j = 0; j != CurIdx; ++j)
1235 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1236 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1237 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1239 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1240 RHS = EI->getVectorOperand();
1241 VIsUndefShuffle = false;
1243 if (!Args.empty()) {
1244 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1245 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1251 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1253 VIsUndefShuffle = false;
1258 unsigned InitElts = VVT->getNumElements();
1260 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1261 // input is the same width as the vector being constructed, generate an
1262 // optimized shuffle of the swizzle input into the result.
1263 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1264 if (isa<ExtVectorElementExpr>(IE)) {
1265 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1266 Value *SVOp = SVI->getOperand(0);
1267 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1269 if (OpTy->getNumElements() == ResElts) {
1270 for (unsigned j = 0; j != CurIdx; ++j) {
1271 // If the current vector initializer is a shuffle with undef, merge
1272 // this shuffle directly into it.
1273 if (VIsUndefShuffle) {
1274 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1277 Args.push_back(Builder.getInt32(j));
1280 for (unsigned j = 0, je = InitElts; j != je; ++j)
1281 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1282 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1284 if (VIsUndefShuffle)
1285 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1291 // Extend init to result vector length, and then shuffle its contribution
1292 // to the vector initializer into V.
1294 for (unsigned j = 0; j != InitElts; ++j)
1295 Args.push_back(Builder.getInt32(j));
1296 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1297 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1298 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1302 for (unsigned j = 0; j != CurIdx; ++j)
1303 Args.push_back(Builder.getInt32(j));
1304 for (unsigned j = 0; j != InitElts; ++j)
1305 Args.push_back(Builder.getInt32(j+Offset));
1306 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1309 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1310 // merging subsequent shuffles into this one.
1313 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1314 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1315 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1319 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1320 // Emit remaining default initializers.
1321 llvm::Type *EltTy = VType->getElementType();
1323 // Emit remaining default initializers
1324 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1325 Value *Idx = Builder.getInt32(CurIdx);
1326 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1327 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1332 bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) {
1333 const Expr *E = CE->getSubExpr();
1335 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1338 if (isa<CXXThisExpr>(E->IgnoreParens())) {
1339 // We always assume that 'this' is never null.
1343 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1344 // And that glvalue casts are never null.
1345 if (ICE->getValueKind() != VK_RValue)
1352 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1353 // have to handle a more broad range of conversions than explicit casts, as they
1354 // handle things like function to ptr-to-function decay etc.
1355 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1356 Expr *E = CE->getSubExpr();
1357 QualType DestTy = CE->getType();
1358 CastKind Kind = CE->getCastKind();
1360 // These cases are generally not written to ignore the result of
1361 // evaluating their sub-expressions, so we clear this now.
1362 bool Ignored = TestAndClearIgnoreResultAssign();
1364 // Since almost all cast kinds apply to scalars, this switch doesn't have
1365 // a default case, so the compiler will warn on a missing case. The cases
1366 // are in the same order as in the CastKind enum.
1368 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1369 case CK_BuiltinFnToFnPtr:
1370 llvm_unreachable("builtin functions are handled elsewhere");
1372 case CK_LValueBitCast:
1373 case CK_ObjCObjectLValueCast: {
1374 Address Addr = EmitLValue(E).getAddress();
1375 Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy));
1376 LValue LV = CGF.MakeAddrLValue(Addr, DestTy);
1377 return EmitLoadOfLValue(LV, CE->getExprLoc());
1380 case CK_CPointerToObjCPointerCast:
1381 case CK_BlockPointerToObjCPointerCast:
1382 case CK_AnyPointerToBlockPointerCast:
1384 Value *Src = Visit(const_cast<Expr*>(E));
1385 llvm::Type *SrcTy = Src->getType();
1386 llvm::Type *DstTy = ConvertType(DestTy);
1387 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1388 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1389 llvm_unreachable("wrong cast for pointers in different address spaces"
1390 "(must be an address space cast)!");
1393 if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
1394 if (auto PT = DestTy->getAs<PointerType>())
1395 CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src,
1397 CodeGenFunction::CFITCK_UnrelatedCast,
1401 return Builder.CreateBitCast(Src, DstTy);
1403 case CK_AddressSpaceConversion: {
1404 Expr::EvalResult Result;
1405 if (E->EvaluateAsRValue(Result, CGF.getContext()) &&
1406 Result.Val.isNullPointer()) {
1407 // If E has side effect, it is emitted even if its final result is a
1408 // null pointer. In that case, a DCE pass should be able to
1409 // eliminate the useless instructions emitted during translating E.
1410 if (Result.HasSideEffects)
1412 return CGF.CGM.getNullPointer(cast<llvm::PointerType>(
1413 ConvertType(DestTy)), DestTy);
1415 // Since target may map different address spaces in AST to the same address
1416 // space, an address space conversion may end up as a bitcast.
1417 auto *Src = Visit(E);
1418 return CGF.CGM.getTargetCodeGenInfo().performAddrSpaceCast(CGF, Src,
1422 case CK_AtomicToNonAtomic:
1423 case CK_NonAtomicToAtomic:
1425 case CK_UserDefinedConversion:
1426 return Visit(const_cast<Expr*>(E));
1428 case CK_BaseToDerived: {
1429 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1430 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1432 Address Base = CGF.EmitPointerWithAlignment(E);
1434 CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl,
1435 CE->path_begin(), CE->path_end(),
1436 CGF.ShouldNullCheckClassCastValue(CE));
1438 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1439 // performed and the object is not of the derived type.
1440 if (CGF.sanitizePerformTypeCheck())
1441 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1442 Derived.getPointer(), DestTy->getPointeeType());
1444 if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
1445 CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(),
1446 Derived.getPointer(),
1448 CodeGenFunction::CFITCK_DerivedCast,
1451 return Derived.getPointer();
1453 case CK_UncheckedDerivedToBase:
1454 case CK_DerivedToBase: {
1455 // The EmitPointerWithAlignment path does this fine; just discard
1457 return CGF.EmitPointerWithAlignment(CE).getPointer();
1461 Address V = CGF.EmitPointerWithAlignment(E);
1462 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1463 return CGF.EmitDynamicCast(V, DCE);
1466 case CK_ArrayToPointerDecay:
1467 return CGF.EmitArrayToPointerDecay(E).getPointer();
1468 case CK_FunctionToPointerDecay:
1469 return EmitLValue(E).getPointer();
1471 case CK_NullToPointer:
1472 if (MustVisitNullValue(E))
1475 return CGF.CGM.getNullPointer(cast<llvm::PointerType>(ConvertType(DestTy)),
1478 case CK_NullToMemberPointer: {
1479 if (MustVisitNullValue(E))
1482 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1483 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1486 case CK_ReinterpretMemberPointer:
1487 case CK_BaseToDerivedMemberPointer:
1488 case CK_DerivedToBaseMemberPointer: {
1489 Value *Src = Visit(E);
1491 // Note that the AST doesn't distinguish between checked and
1492 // unchecked member pointer conversions, so we always have to
1493 // implement checked conversions here. This is inefficient when
1494 // actual control flow may be required in order to perform the
1495 // check, which it is for data member pointers (but not member
1496 // function pointers on Itanium and ARM).
1497 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1500 case CK_ARCProduceObject:
1501 return CGF.EmitARCRetainScalarExpr(E);
1502 case CK_ARCConsumeObject:
1503 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1504 case CK_ARCReclaimReturnedObject:
1505 return CGF.EmitARCReclaimReturnedObject(E, /*allowUnsafe*/ Ignored);
1506 case CK_ARCExtendBlockObject:
1507 return CGF.EmitARCExtendBlockObject(E);
1509 case CK_CopyAndAutoreleaseBlockObject:
1510 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1512 case CK_FloatingRealToComplex:
1513 case CK_FloatingComplexCast:
1514 case CK_IntegralRealToComplex:
1515 case CK_IntegralComplexCast:
1516 case CK_IntegralComplexToFloatingComplex:
1517 case CK_FloatingComplexToIntegralComplex:
1518 case CK_ConstructorConversion:
1520 llvm_unreachable("scalar cast to non-scalar value");
1522 case CK_LValueToRValue:
1523 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1524 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1525 return Visit(const_cast<Expr*>(E));
1527 case CK_IntegralToPointer: {
1528 Value *Src = Visit(const_cast<Expr*>(E));
1530 // First, convert to the correct width so that we control the kind of
1532 auto DestLLVMTy = ConvertType(DestTy);
1533 llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DestLLVMTy);
1534 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1535 llvm::Value* IntResult =
1536 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1538 return Builder.CreateIntToPtr(IntResult, DestLLVMTy);
1540 case CK_PointerToIntegral:
1541 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1542 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1545 CGF.EmitIgnoredExpr(E);
1548 case CK_VectorSplat: {
1549 llvm::Type *DstTy = ConvertType(DestTy);
1550 Value *Elt = Visit(const_cast<Expr*>(E));
1551 // Splat the element across to all elements
1552 unsigned NumElements = DstTy->getVectorNumElements();
1553 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1556 case CK_IntegralCast:
1557 case CK_IntegralToFloating:
1558 case CK_FloatingToIntegral:
1559 case CK_FloatingCast:
1560 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1562 case CK_BooleanToSignedIntegral:
1563 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1565 /*TreatBooleanAsSigned=*/true);
1566 case CK_IntegralToBoolean:
1567 return EmitIntToBoolConversion(Visit(E));
1568 case CK_PointerToBoolean:
1569 return EmitPointerToBoolConversion(Visit(E), E->getType());
1570 case CK_FloatingToBoolean:
1571 return EmitFloatToBoolConversion(Visit(E));
1572 case CK_MemberPointerToBoolean: {
1573 llvm::Value *MemPtr = Visit(E);
1574 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1575 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1578 case CK_FloatingComplexToReal:
1579 case CK_IntegralComplexToReal:
1580 return CGF.EmitComplexExpr(E, false, true).first;
1582 case CK_FloatingComplexToBoolean:
1583 case CK_IntegralComplexToBoolean: {
1584 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1586 // TODO: kill this function off, inline appropriate case here
1587 return EmitComplexToScalarConversion(V, E->getType(), DestTy,
1591 case CK_ZeroToOCLEvent: {
1592 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1593 return llvm::Constant::getNullValue(ConvertType(DestTy));
1596 case CK_ZeroToOCLQueue: {
1597 assert(DestTy->isQueueT() && "CK_ZeroToOCLQueue cast on non queue_t type");
1598 return llvm::Constant::getNullValue(ConvertType(DestTy));
1601 case CK_IntToOCLSampler:
1602 return CGF.CGM.createOpenCLIntToSamplerConversion(E, CGF);
\r
1606 llvm_unreachable("unknown scalar cast");
1609 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1610 CodeGenFunction::StmtExprEvaluation eval(CGF);
1611 Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1612 !E->getType()->isVoidType());
1613 if (!RetAlloca.isValid())
1615 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1619 //===----------------------------------------------------------------------===//
1621 //===----------------------------------------------------------------------===//
1623 static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
1624 llvm::Value *InVal, bool IsInc) {
1627 BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
1628 BinOp.Ty = E->getType();
1629 BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
1630 BinOp.FPContractable = false;
1635 llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
1636 const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
1637 llvm::Value *Amount =
1638 llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true);
1639 StringRef Name = IsInc ? "inc" : "dec";
1640 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1641 case LangOptions::SOB_Defined:
1642 return Builder.CreateAdd(InVal, Amount, Name);
1643 case LangOptions::SOB_Undefined:
1644 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
1645 return Builder.CreateNSWAdd(InVal, Amount, Name);
1647 case LangOptions::SOB_Trapping:
1648 return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc));
1650 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1654 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1655 bool isInc, bool isPre) {
1657 QualType type = E->getSubExpr()->getType();
1658 llvm::PHINode *atomicPHI = nullptr;
1662 int amount = (isInc ? 1 : -1);
1664 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1665 type = atomicTy->getValueType();
1666 if (isInc && type->isBooleanType()) {
1667 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1669 Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified())
1670 ->setAtomic(llvm::AtomicOrdering::SequentiallyConsistent);
1671 return Builder.getTrue();
1673 // For atomic bool increment, we just store true and return it for
1674 // preincrement, do an atomic swap with true for postincrement
1675 return Builder.CreateAtomicRMW(
1676 llvm::AtomicRMWInst::Xchg, LV.getPointer(), True,
1677 llvm::AtomicOrdering::SequentiallyConsistent);
1679 // Special case for atomic increment / decrement on integers, emit
1680 // atomicrmw instructions. We skip this if we want to be doing overflow
1681 // checking, and fall into the slow path with the atomic cmpxchg loop.
1682 if (!type->isBooleanType() && type->isIntegerType() &&
1683 !(type->isUnsignedIntegerType() &&
1684 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
1685 CGF.getLangOpts().getSignedOverflowBehavior() !=
1686 LangOptions::SOB_Trapping) {
1687 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1688 llvm::AtomicRMWInst::Sub;
1689 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1690 llvm::Instruction::Sub;
1691 llvm::Value *amt = CGF.EmitToMemory(
1692 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1693 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1694 LV.getPointer(), amt, llvm::AtomicOrdering::SequentiallyConsistent);
1695 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1697 value = EmitLoadOfLValue(LV, E->getExprLoc());
1699 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1700 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1701 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1702 value = CGF.EmitToMemory(value, type);
1703 Builder.CreateBr(opBB);
1704 Builder.SetInsertPoint(opBB);
1705 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1706 atomicPHI->addIncoming(value, startBB);
1709 value = EmitLoadOfLValue(LV, E->getExprLoc());
1713 // Special case of integer increment that we have to check first: bool++.
1714 // Due to promotion rules, we get:
1715 // bool++ -> bool = bool + 1
1716 // -> bool = (int)bool + 1
1717 // -> bool = ((int)bool + 1 != 0)
1718 // An interesting aspect of this is that increment is always true.
1719 // Decrement does not have this property.
1720 if (isInc && type->isBooleanType()) {
1721 value = Builder.getTrue();
1723 // Most common case by far: integer increment.
1724 } else if (type->isIntegerType()) {
1725 // Note that signed integer inc/dec with width less than int can't
1726 // overflow because of promotion rules; we're just eliding a few steps here.
1727 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1728 CGF.IntTy->getIntegerBitWidth();
1729 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1730 value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
1731 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1732 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
1734 EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc));
1736 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1737 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1740 // Next most common: pointer increment.
1741 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1742 QualType type = ptr->getPointeeType();
1744 // VLA types don't have constant size.
1745 if (const VariableArrayType *vla
1746 = CGF.getContext().getAsVariableArrayType(type)) {
1747 llvm::Value *numElts = CGF.getVLASize(vla).first;
1748 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1749 if (CGF.getLangOpts().isSignedOverflowDefined())
1750 value = Builder.CreateGEP(value, numElts, "vla.inc");
1752 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1754 // Arithmetic on function pointers (!) is just +-1.
1755 } else if (type->isFunctionType()) {
1756 llvm::Value *amt = Builder.getInt32(amount);
1758 value = CGF.EmitCastToVoidPtr(value);
1759 if (CGF.getLangOpts().isSignedOverflowDefined())
1760 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1762 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1763 value = Builder.CreateBitCast(value, input->getType());
1765 // For everything else, we can just do a simple increment.
1767 llvm::Value *amt = Builder.getInt32(amount);
1768 if (CGF.getLangOpts().isSignedOverflowDefined())
1769 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1771 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1774 // Vector increment/decrement.
1775 } else if (type->isVectorType()) {
1776 if (type->hasIntegerRepresentation()) {
1777 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1779 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1781 value = Builder.CreateFAdd(
1783 llvm::ConstantFP::get(value->getType(), amount),
1784 isInc ? "inc" : "dec");
1788 } else if (type->isRealFloatingType()) {
1789 // Add the inc/dec to the real part.
1792 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1793 // Another special case: half FP increment should be done via float
1794 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1795 value = Builder.CreateCall(
1796 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1798 input, "incdec.conv");
1800 value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv");
1804 if (value->getType()->isFloatTy())
1805 amt = llvm::ConstantFP::get(VMContext,
1806 llvm::APFloat(static_cast<float>(amount)));
1807 else if (value->getType()->isDoubleTy())
1808 amt = llvm::ConstantFP::get(VMContext,
1809 llvm::APFloat(static_cast<double>(amount)));
1811 // Remaining types are Half, LongDouble or __float128. Convert from float.
1812 llvm::APFloat F(static_cast<float>(amount));
1814 const llvm::fltSemantics *FS;
1815 // Don't use getFloatTypeSemantics because Half isn't
1816 // necessarily represented using the "half" LLVM type.
1817 if (value->getType()->isFP128Ty())
1818 FS = &CGF.getTarget().getFloat128Format();
1819 else if (value->getType()->isHalfTy())
1820 FS = &CGF.getTarget().getHalfFormat();
1822 FS = &CGF.getTarget().getLongDoubleFormat();
1823 F.convert(*FS, llvm::APFloat::rmTowardZero, &ignored);
1824 amt = llvm::ConstantFP::get(VMContext, F);
1826 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1828 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1829 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1830 value = Builder.CreateCall(
1831 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
1833 value, "incdec.conv");
1835 value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv");
1839 // Objective-C pointer types.
1841 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1842 value = CGF.EmitCastToVoidPtr(value);
1844 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1845 if (!isInc) size = -size;
1846 llvm::Value *sizeValue =
1847 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1849 if (CGF.getLangOpts().isSignedOverflowDefined())
1850 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1852 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
1853 value = Builder.CreateBitCast(value, input->getType());
1857 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1858 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1859 auto Pair = CGF.EmitAtomicCompareExchange(
1860 LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
1861 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
1862 llvm::Value *success = Pair.second;
1863 atomicPHI->addIncoming(old, opBB);
1864 Builder.CreateCondBr(success, contBB, opBB);
1865 Builder.SetInsertPoint(contBB);
1866 return isPre ? value : input;
1869 // Store the updated result through the lvalue.
1870 if (LV.isBitField())
1871 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
1873 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
1875 // If this is a postinc, return the value read from memory, otherwise use the
1877 return isPre ? value : input;
1882 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
1883 TestAndClearIgnoreResultAssign();
1884 // Emit unary minus with EmitSub so we handle overflow cases etc.
1886 BinOp.RHS = Visit(E->getSubExpr());
1888 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1889 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1891 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
1892 BinOp.Ty = E->getType();
1893 BinOp.Opcode = BO_Sub;
1894 BinOp.FPContractable = false;
1896 return EmitSub(BinOp);
1899 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
1900 TestAndClearIgnoreResultAssign();
1901 Value *Op = Visit(E->getSubExpr());
1902 return Builder.CreateNot(Op, "neg");
1905 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1906 // Perform vector logical not on comparison with zero vector.
1907 if (E->getType()->isExtVectorType()) {
1908 Value *Oper = Visit(E->getSubExpr());
1909 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1911 if (Oper->getType()->isFPOrFPVectorTy())
1912 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1914 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1915 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1918 // Compare operand to zero.
1919 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
1922 // TODO: Could dynamically modify easy computations here. For example, if
1923 // the operand is an icmp ne, turn into icmp eq.
1924 BoolVal = Builder.CreateNot(BoolVal, "lnot");
1926 // ZExt result to the expr type.
1927 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
1930 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1931 // Try folding the offsetof to a constant.
1933 if (E->EvaluateAsInt(Value, CGF.getContext()))
1934 return Builder.getInt(Value);
1936 // Loop over the components of the offsetof to compute the value.
1937 unsigned n = E->getNumComponents();
1938 llvm::Type* ResultType = ConvertType(E->getType());
1939 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1940 QualType CurrentType = E->getTypeSourceInfo()->getType();
1941 for (unsigned i = 0; i != n; ++i) {
1942 OffsetOfNode ON = E->getComponent(i);
1943 llvm::Value *Offset = nullptr;
1944 switch (ON.getKind()) {
1945 case OffsetOfNode::Array: {
1946 // Compute the index
1947 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1948 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1949 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
1950 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1952 // Save the element type
1954 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1956 // Compute the element size
1957 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1958 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1960 // Multiply out to compute the result
1961 Offset = Builder.CreateMul(Idx, ElemSize);
1965 case OffsetOfNode::Field: {
1966 FieldDecl *MemberDecl = ON.getField();
1967 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1968 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1970 // Compute the index of the field in its parent.
1972 // FIXME: It would be nice if we didn't have to loop here!
1973 for (RecordDecl::field_iterator Field = RD->field_begin(),
1974 FieldEnd = RD->field_end();
1975 Field != FieldEnd; ++Field, ++i) {
1976 if (*Field == MemberDecl)
1979 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1981 // Compute the offset to the field
1982 int64_t OffsetInt = RL.getFieldOffset(i) /
1983 CGF.getContext().getCharWidth();
1984 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1986 // Save the element type.
1987 CurrentType = MemberDecl->getType();
1991 case OffsetOfNode::Identifier:
1992 llvm_unreachable("dependent __builtin_offsetof");
1994 case OffsetOfNode::Base: {
1995 if (ON.getBase()->isVirtual()) {
1996 CGF.ErrorUnsupported(E, "virtual base in offsetof");
2000 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
2001 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
2003 // Save the element type.
2004 CurrentType = ON.getBase()->getType();
2006 // Compute the offset to the base.
2007 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
2008 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
2009 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
2010 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
2014 Result = Builder.CreateAdd(Result, Offset);
2019 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
2020 /// argument of the sizeof expression as an integer.
2022 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
2023 const UnaryExprOrTypeTraitExpr *E) {
2024 QualType TypeToSize = E->getTypeOfArgument();
2025 if (E->getKind() == UETT_SizeOf) {
2026 if (const VariableArrayType *VAT =
2027 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
2028 if (E->isArgumentType()) {
2029 // sizeof(type) - make sure to emit the VLA size.
2030 CGF.EmitVariablyModifiedType(TypeToSize);
2032 // C99 6.5.3.4p2: If the argument is an expression of type
2033 // VLA, it is evaluated.
2034 CGF.EmitIgnoredExpr(E->getArgumentExpr());
2038 llvm::Value *numElts;
2039 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
2041 llvm::Value *size = numElts;
2043 // Scale the number of non-VLA elements by the non-VLA element size.
2044 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
2045 if (!eltSize.isOne())
2046 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
2050 } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) {
2053 .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign(
2054 E->getTypeOfArgument()->getPointeeType()))
2056 return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
2059 // If this isn't sizeof(vla), the result must be constant; use the constant
2060 // folding logic so we don't have to duplicate it here.
2061 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
2064 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
2065 Expr *Op = E->getSubExpr();
2066 if (Op->getType()->isAnyComplexType()) {
2067 // If it's an l-value, load through the appropriate subobject l-value.
2068 // Note that we have to ask E because Op might be an l-value that
2069 // this won't work for, e.g. an Obj-C property.
2071 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2072 E->getExprLoc()).getScalarVal();
2074 // Otherwise, calculate and project.
2075 return CGF.EmitComplexExpr(Op, false, true).first;
2081 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
2082 Expr *Op = E->getSubExpr();
2083 if (Op->getType()->isAnyComplexType()) {
2084 // If it's an l-value, load through the appropriate subobject l-value.
2085 // Note that we have to ask E because Op might be an l-value that
2086 // this won't work for, e.g. an Obj-C property.
2087 if (Op->isGLValue())
2088 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2089 E->getExprLoc()).getScalarVal();
2091 // Otherwise, calculate and project.
2092 return CGF.EmitComplexExpr(Op, true, false).second;
2095 // __imag on a scalar returns zero. Emit the subexpr to ensure side
2096 // effects are evaluated, but not the actual value.
2097 if (Op->isGLValue())
2100 CGF.EmitScalarExpr(Op, true);
2101 return llvm::Constant::getNullValue(ConvertType(E->getType()));
2104 //===----------------------------------------------------------------------===//
2106 //===----------------------------------------------------------------------===//
2108 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
2109 TestAndClearIgnoreResultAssign();
2111 Result.LHS = Visit(E->getLHS());
2112 Result.RHS = Visit(E->getRHS());
2113 Result.Ty = E->getType();
2114 Result.Opcode = E->getOpcode();
2115 Result.FPContractable = E->isFPContractable();
2120 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
2121 const CompoundAssignOperator *E,
2122 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2124 QualType LHSTy = E->getLHS()->getType();
2127 if (E->getComputationResultType()->isAnyComplexType())
2128 return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
2130 // Emit the RHS first. __block variables need to have the rhs evaluated
2131 // first, plus this should improve codegen a little.
2132 OpInfo.RHS = Visit(E->getRHS());
2133 OpInfo.Ty = E->getComputationResultType();
2134 OpInfo.Opcode = E->getOpcode();
2135 OpInfo.FPContractable = E->isFPContractable();
2137 // Load/convert the LHS.
2138 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2140 llvm::PHINode *atomicPHI = nullptr;
2141 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2142 QualType type = atomicTy->getValueType();
2143 if (!type->isBooleanType() && type->isIntegerType() &&
2144 !(type->isUnsignedIntegerType() &&
2145 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
2146 CGF.getLangOpts().getSignedOverflowBehavior() !=
2147 LangOptions::SOB_Trapping) {
2148 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2149 switch (OpInfo.Opcode) {
2150 // We don't have atomicrmw operands for *, %, /, <<, >>
2151 case BO_MulAssign: case BO_DivAssign:
2157 aop = llvm::AtomicRMWInst::Add;
2160 aop = llvm::AtomicRMWInst::Sub;
2163 aop = llvm::AtomicRMWInst::And;
2166 aop = llvm::AtomicRMWInst::Xor;
2169 aop = llvm::AtomicRMWInst::Or;
2172 llvm_unreachable("Invalid compound assignment type");
2174 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2175 llvm::Value *amt = CGF.EmitToMemory(
2176 EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy,
2179 Builder.CreateAtomicRMW(aop, LHSLV.getPointer(), amt,
2180 llvm::AtomicOrdering::SequentiallyConsistent);
2184 // FIXME: For floating point types, we should be saving and restoring the
2185 // floating point environment in the loop.
2186 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2187 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2188 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2189 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2190 Builder.CreateBr(opBB);
2191 Builder.SetInsertPoint(opBB);
2192 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2193 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2194 OpInfo.LHS = atomicPHI;
2197 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2199 SourceLocation Loc = E->getExprLoc();
2201 EmitScalarConversion(OpInfo.LHS, LHSTy, E->getComputationLHSType(), Loc);
2203 // Expand the binary operator.
2204 Result = (this->*Func)(OpInfo);
2206 // Convert the result back to the LHS type.
2208 EmitScalarConversion(Result, E->getComputationResultType(), LHSTy, Loc);
2211 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2212 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2213 auto Pair = CGF.EmitAtomicCompareExchange(
2214 LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
2215 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
2216 llvm::Value *success = Pair.second;
2217 atomicPHI->addIncoming(old, opBB);
2218 Builder.CreateCondBr(success, contBB, opBB);
2219 Builder.SetInsertPoint(contBB);
2223 // Store the result value into the LHS lvalue. Bit-fields are handled
2224 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2225 // 'An assignment expression has the value of the left operand after the
2227 if (LHSLV.isBitField())
2228 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2230 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2235 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2236 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2237 bool Ignore = TestAndClearIgnoreResultAssign();
2239 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2241 // If the result is clearly ignored, return now.
2245 // The result of an assignment in C is the assigned r-value.
2246 if (!CGF.getLangOpts().CPlusPlus)
2249 // If the lvalue is non-volatile, return the computed value of the assignment.
2250 if (!LHS.isVolatileQualified())
2253 // Otherwise, reload the value.
2254 return EmitLoadOfLValue(LHS, E->getExprLoc());
2257 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2258 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2259 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks;
2261 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2262 Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
2263 SanitizerKind::IntegerDivideByZero));
2266 if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
2267 Ops.Ty->hasSignedIntegerRepresentation()) {
2268 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2270 llvm::Value *IntMin =
2271 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2272 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2274 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2275 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2276 llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2278 std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow));
2281 if (Checks.size() > 0)
2282 EmitBinOpCheck(Checks, Ops);
2285 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2287 CodeGenFunction::SanitizerScope SanScope(&CGF);
2288 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2289 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2290 Ops.Ty->isIntegerType()) {
2291 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2292 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2293 } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
2294 Ops.Ty->isRealFloatingType()) {
2295 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2296 llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
2297 EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero),
2302 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2303 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2304 if (CGF.getLangOpts().OpenCL &&
2305 !CGF.CGM.getCodeGenOpts().CorrectlyRoundedDivSqrt) {
2306 // OpenCL v1.1 s7.4: minimum accuracy of single precision / is 2.5ulp
2307 // OpenCL v1.2 s5.6.4.2: The -cl-fp32-correctly-rounded-divide-sqrt
2308 // build option allows an application to specify that single precision
2309 // floating-point divide (x/y and 1/x) and sqrt used in the program
2310 // source are correctly rounded.
2311 llvm::Type *ValTy = Val->getType();
2312 if (ValTy->isFloatTy() ||
2313 (isa<llvm::VectorType>(ValTy) &&
2314 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2315 CGF.SetFPAccuracy(Val, 2.5);
2319 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2320 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2322 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2325 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2326 // Rem in C can't be a floating point type: C99 6.5.5p2.
2327 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2328 CodeGenFunction::SanitizerScope SanScope(&CGF);
2329 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2331 if (Ops.Ty->isIntegerType())
2332 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2335 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2336 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2338 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2341 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2345 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2346 switch (Ops.Opcode) {
2350 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2351 llvm::Intrinsic::uadd_with_overflow;
2356 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2357 llvm::Intrinsic::usub_with_overflow;
2362 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2363 llvm::Intrinsic::umul_with_overflow;
2366 llvm_unreachable("Unsupported operation for overflow detection");
2372 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2374 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2376 Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
2377 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2378 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2380 // Handle overflow with llvm.trap if no custom handler has been specified.
2381 const std::string *handlerName =
2382 &CGF.getLangOpts().OverflowHandler;
2383 if (handlerName->empty()) {
2384 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2385 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2386 if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
2387 CodeGenFunction::SanitizerScope SanScope(&CGF);
2388 llvm::Value *NotOverflow = Builder.CreateNot(overflow);
2389 SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow
2390 : SanitizerKind::UnsignedIntegerOverflow;
2391 EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops);
2393 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2397 // Branch in case of overflow.
2398 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2399 llvm::BasicBlock *continueBB =
2400 CGF.createBasicBlock("nooverflow", CGF.CurFn, initialBB->getNextNode());
2401 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2403 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2405 // If an overflow handler is set, then we want to call it and then use its
2406 // result, if it returns.
2407 Builder.SetInsertPoint(overflowBB);
2409 // Get the overflow handler.
2410 llvm::Type *Int8Ty = CGF.Int8Ty;
2411 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2412 llvm::FunctionType *handlerTy =
2413 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2414 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2416 // Sign extend the args to 64-bit, so that we can use the same handler for
2417 // all types of overflow.
2418 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2419 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2421 // Call the handler with the two arguments, the operation, and the size of
2423 llvm::Value *handlerArgs[] = {
2426 Builder.getInt8(OpID),
2427 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2429 llvm::Value *handlerResult =
2430 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2432 // Truncate the result back to the desired size.
2433 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2434 Builder.CreateBr(continueBB);
2436 Builder.SetInsertPoint(continueBB);
2437 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2438 phi->addIncoming(result, initialBB);
2439 phi->addIncoming(handlerResult, overflowBB);
2444 /// Emit pointer + index arithmetic.
2445 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2446 const BinOpInfo &op,
2447 bool isSubtraction) {
2448 // Must have binary (not unary) expr here. Unary pointer
2449 // increment/decrement doesn't use this path.
2450 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2452 Value *pointer = op.LHS;
2453 Expr *pointerOperand = expr->getLHS();
2454 Value *index = op.RHS;
2455 Expr *indexOperand = expr->getRHS();
2457 // In a subtraction, the LHS is always the pointer.
2458 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2459 std::swap(pointer, index);
2460 std::swap(pointerOperand, indexOperand);
2463 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2464 auto &DL = CGF.CGM.getDataLayout();
2465 auto PtrTy = cast<llvm::PointerType>(pointer->getType());
2466 if (width != DL.getTypeSizeInBits(PtrTy)) {
2467 // Zero-extend or sign-extend the pointer value according to
2468 // whether the index is signed or not.
2469 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2470 index = CGF.Builder.CreateIntCast(index, DL.getIntPtrType(PtrTy), isSigned,
2474 // If this is subtraction, negate the index.
2476 index = CGF.Builder.CreateNeg(index, "idx.neg");
2478 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
2479 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2480 /*Accessed*/ false);
2482 const PointerType *pointerType
2483 = pointerOperand->getType()->getAs<PointerType>();
2485 QualType objectType = pointerOperand->getType()
2486 ->castAs<ObjCObjectPointerType>()
2488 llvm::Value *objectSize
2489 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2491 index = CGF.Builder.CreateMul(index, objectSize);
2493 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2494 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2495 return CGF.Builder.CreateBitCast(result, pointer->getType());
2498 QualType elementType = pointerType->getPointeeType();
2499 if (const VariableArrayType *vla
2500 = CGF.getContext().getAsVariableArrayType(elementType)) {
2501 // The element count here is the total number of non-VLA elements.
2502 llvm::Value *numElements = CGF.getVLASize(vla).first;
2504 // Effectively, the multiply by the VLA size is part of the GEP.
2505 // GEP indexes are signed, and scaling an index isn't permitted to
2506 // signed-overflow, so we use the same semantics for our explicit
2507 // multiply. We suppress this if overflow is not undefined behavior.
2508 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2509 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2510 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2512 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2513 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2518 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2519 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2521 if (elementType->isVoidType() || elementType->isFunctionType()) {
2522 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2523 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2524 return CGF.Builder.CreateBitCast(result, pointer->getType());
2527 if (CGF.getLangOpts().isSignedOverflowDefined())
2528 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2530 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2533 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2534 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2535 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2536 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2537 // efficient operations.
2538 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2539 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2540 bool negMul, bool negAdd) {
2541 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2543 Value *MulOp0 = MulOp->getOperand(0);
2544 Value *MulOp1 = MulOp->getOperand(1);
2548 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2550 } else if (negAdd) {
2553 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2557 Value *FMulAdd = Builder.CreateCall(
2558 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2559 {MulOp0, MulOp1, Addend});
2560 MulOp->eraseFromParent();
2565 // Check whether it would be legal to emit an fmuladd intrinsic call to
2566 // represent op and if so, build the fmuladd.
2568 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2569 // Does NOT check the type of the operation - it's assumed that this function
2570 // will be called from contexts where it's known that the type is contractable.
2571 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2572 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2575 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2576 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2577 "Only fadd/fsub can be the root of an fmuladd.");
2579 // Check whether this op is marked as fusable.
2580 if (!op.FPContractable)
2583 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2584 // either disabled, or handled entirely by the LLVM backend).
2585 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
2588 // We have a potentially fusable op. Look for a mul on one of the operands.
2589 // Also, make sure that the mul result isn't used directly. In that case,
2590 // there's no point creating a muladd operation.
2591 if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2592 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2593 LHSBinOp->use_empty())
2594 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2596 if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2597 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2598 RHSBinOp->use_empty())
2599 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2605 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2606 if (op.LHS->getType()->isPointerTy() ||
2607 op.RHS->getType()->isPointerTy())
2608 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2610 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2611 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2612 case LangOptions::SOB_Defined:
2613 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2614 case LangOptions::SOB_Undefined:
2615 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2616 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2618 case LangOptions::SOB_Trapping:
2619 return EmitOverflowCheckedBinOp(op);
2623 if (op.Ty->isUnsignedIntegerType() &&
2624 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2625 return EmitOverflowCheckedBinOp(op);
2627 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2628 // Try to form an fmuladd.
2629 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2632 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
2635 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2638 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2639 // The LHS is always a pointer if either side is.
2640 if (!op.LHS->getType()->isPointerTy()) {
2641 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2642 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2643 case LangOptions::SOB_Defined:
2644 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2645 case LangOptions::SOB_Undefined:
2646 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2647 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2649 case LangOptions::SOB_Trapping:
2650 return EmitOverflowCheckedBinOp(op);
2654 if (op.Ty->isUnsignedIntegerType() &&
2655 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2656 return EmitOverflowCheckedBinOp(op);
2658 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2659 // Try to form an fmuladd.
2660 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2662 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
2665 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2668 // If the RHS is not a pointer, then we have normal pointer
2670 if (!op.RHS->getType()->isPointerTy())
2671 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2673 // Otherwise, this is a pointer subtraction.
2675 // Do the raw subtraction part.
2677 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2679 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2680 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2682 // Okay, figure out the element size.
2683 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2684 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2686 llvm::Value *divisor = nullptr;
2688 // For a variable-length array, this is going to be non-constant.
2689 if (const VariableArrayType *vla
2690 = CGF.getContext().getAsVariableArrayType(elementType)) {
2691 llvm::Value *numElements;
2692 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2694 divisor = numElements;
2696 // Scale the number of non-VLA elements by the non-VLA element size.
2697 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2698 if (!eltSize.isOne())
2699 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2701 // For everything elese, we can just compute it, safe in the
2702 // assumption that Sema won't let anything through that we can't
2703 // safely compute the size of.
2705 CharUnits elementSize;
2706 // Handle GCC extension for pointer arithmetic on void* and
2707 // function pointer types.
2708 if (elementType->isVoidType() || elementType->isFunctionType())
2709 elementSize = CharUnits::One();
2711 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2713 // Don't even emit the divide for element size of 1.
2714 if (elementSize.isOne())
2717 divisor = CGF.CGM.getSize(elementSize);
2720 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2721 // pointer difference in C is only defined in the case where both operands
2722 // are pointing to elements of an array.
2723 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2726 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2727 llvm::IntegerType *Ty;
2728 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2729 Ty = cast<llvm::IntegerType>(VT->getElementType());
2731 Ty = cast<llvm::IntegerType>(LHS->getType());
2732 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2735 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2736 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2737 // RHS to the same size as the LHS.
2738 Value *RHS = Ops.RHS;
2739 if (Ops.LHS->getType() != RHS->getType())
2740 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2742 bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
2743 Ops.Ty->hasSignedIntegerRepresentation() &&
2744 !CGF.getLangOpts().isSignedOverflowDefined();
2745 bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
2746 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2747 if (CGF.getLangOpts().OpenCL)
2749 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2750 else if ((SanitizeBase || SanitizeExponent) &&
2751 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2752 CodeGenFunction::SanitizerScope SanScope(&CGF);
2753 SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks;
2754 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
2755 llvm::Value *ValidExponent = Builder.CreateICmpULE(RHS, WidthMinusOne);
2757 if (SanitizeExponent) {
2759 std::make_pair(ValidExponent, SanitizerKind::ShiftExponent));
2763 // Check whether we are shifting any non-zero bits off the top of the
2764 // integer. We only emit this check if exponent is valid - otherwise
2765 // instructions below will have undefined behavior themselves.
2766 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2767 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2768 llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
2769 Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
2770 CGF.EmitBlock(CheckShiftBase);
2771 llvm::Value *BitsShiftedOff =
2772 Builder.CreateLShr(Ops.LHS,
2773 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2774 /*NUW*/true, /*NSW*/true),
2776 if (CGF.getLangOpts().CPlusPlus) {
2777 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2778 // Under C++11's rules, shifting a 1 bit into the sign bit is
2779 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2780 // define signed left shifts, so we use the C99 and C++11 rules there).
2781 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2782 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2784 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2785 llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2786 CGF.EmitBlock(Cont);
2787 llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
2788 BaseCheck->addIncoming(Builder.getTrue(), Orig);
2789 BaseCheck->addIncoming(ValidBase, CheckShiftBase);
2790 Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase));
2793 assert(!Checks.empty());
2794 EmitBinOpCheck(Checks, Ops);
2797 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2800 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2801 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2802 // RHS to the same size as the LHS.
2803 Value *RHS = Ops.RHS;
2804 if (Ops.LHS->getType() != RHS->getType())
2805 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2807 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2808 if (CGF.getLangOpts().OpenCL)
2810 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2811 else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
2812 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2813 CodeGenFunction::SanitizerScope SanScope(&CGF);
2814 llvm::Value *Valid =
2815 Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS));
2816 EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops);
2819 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2820 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2821 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2824 enum IntrinsicType { VCMPEQ, VCMPGT };
2825 // return corresponding comparison intrinsic for given vector type
2826 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2827 BuiltinType::Kind ElemKind) {
2829 default: llvm_unreachable("unexpected element type");
2830 case BuiltinType::Char_U:
2831 case BuiltinType::UChar:
2832 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2833 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
2834 case BuiltinType::Char_S:
2835 case BuiltinType::SChar:
2836 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2837 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
2838 case BuiltinType::UShort:
2839 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2840 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
2841 case BuiltinType::Short:
2842 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2843 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
2844 case BuiltinType::UInt:
2845 case BuiltinType::ULong:
2846 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2847 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
2848 case BuiltinType::Int:
2849 case BuiltinType::Long:
2850 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2851 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
2852 case BuiltinType::Float:
2853 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2854 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
2858 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,
2859 llvm::CmpInst::Predicate UICmpOpc,
2860 llvm::CmpInst::Predicate SICmpOpc,
2861 llvm::CmpInst::Predicate FCmpOpc) {
2862 TestAndClearIgnoreResultAssign();
2864 QualType LHSTy = E->getLHS()->getType();
2865 QualType RHSTy = E->getRHS()->getType();
2866 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
2867 assert(E->getOpcode() == BO_EQ ||
2868 E->getOpcode() == BO_NE);
2869 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2870 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
2871 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
2872 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
2873 } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
2874 Value *LHS = Visit(E->getLHS());
2875 Value *RHS = Visit(E->getRHS());
2877 // If AltiVec, the comparison results in a numeric type, so we use
2878 // intrinsics comparing vectors and giving 0 or 1 as a result
2879 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
2880 // constants for mapping CR6 register bits to predicate result
2881 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2883 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2885 // in several cases vector arguments order will be reversed
2886 Value *FirstVecArg = LHS,
2887 *SecondVecArg = RHS;
2889 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
2890 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
2891 BuiltinType::Kind ElementKind = BTy->getKind();
2893 switch(E->getOpcode()) {
2894 default: llvm_unreachable("is not a comparison operation");
2897 ID = GetIntrinsic(VCMPEQ, ElementKind);
2901 ID = GetIntrinsic(VCMPEQ, ElementKind);
2905 ID = GetIntrinsic(VCMPGT, ElementKind);
2906 std::swap(FirstVecArg, SecondVecArg);
2910 ID = GetIntrinsic(VCMPGT, ElementKind);
2913 if (ElementKind == BuiltinType::Float) {
2915 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2916 std::swap(FirstVecArg, SecondVecArg);
2920 ID = GetIntrinsic(VCMPGT, ElementKind);
2924 if (ElementKind == BuiltinType::Float) {
2926 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2930 ID = GetIntrinsic(VCMPGT, ElementKind);
2931 std::swap(FirstVecArg, SecondVecArg);
2936 Value *CR6Param = Builder.getInt32(CR6);
2937 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2938 Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
2939 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
2943 if (LHS->getType()->isFPOrFPVectorTy()) {
2944 Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp");
2945 } else if (LHSTy->hasSignedIntegerRepresentation()) {
2946 Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp");
2948 // Unsigned integers and pointers.
2949 Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp");
2952 // If this is a vector comparison, sign extend the result to the appropriate
2953 // vector integer type and return it (don't convert to bool).
2954 if (LHSTy->isVectorType())
2955 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2958 // Complex Comparison: can only be an equality comparison.
2959 CodeGenFunction::ComplexPairTy LHS, RHS;
2961 if (auto *CTy = LHSTy->getAs<ComplexType>()) {
2962 LHS = CGF.EmitComplexExpr(E->getLHS());
2963 CETy = CTy->getElementType();
2965 LHS.first = Visit(E->getLHS());
2966 LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
2969 if (auto *CTy = RHSTy->getAs<ComplexType>()) {
2970 RHS = CGF.EmitComplexExpr(E->getRHS());
2971 assert(CGF.getContext().hasSameUnqualifiedType(CETy,
2972 CTy->getElementType()) &&
2973 "The element types must always match.");
2976 RHS.first = Visit(E->getRHS());
2977 RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
2978 assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
2979 "The element types must always match.");
2982 Value *ResultR, *ResultI;
2983 if (CETy->isRealFloatingType()) {
2984 ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r");
2985 ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i");
2987 // Complex comparisons can only be equality comparisons. As such, signed
2988 // and unsigned opcodes are the same.
2989 ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r");
2990 ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i");
2993 if (E->getOpcode() == BO_EQ) {
2994 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2996 assert(E->getOpcode() == BO_NE &&
2997 "Complex comparison other than == or != ?");
2998 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
3002 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
3006 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
3007 bool Ignore = TestAndClearIgnoreResultAssign();
3012 switch (E->getLHS()->getType().getObjCLifetime()) {
3013 case Qualifiers::OCL_Strong:
3014 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
3017 case Qualifiers::OCL_Autoreleasing:
3018 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
3021 case Qualifiers::OCL_ExplicitNone:
3022 std::tie(LHS, RHS) = CGF.EmitARCStoreUnsafeUnretained(E, Ignore);
3025 case Qualifiers::OCL_Weak:
3026 RHS = Visit(E->getRHS());
3027 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3028 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
3031 case Qualifiers::OCL_None:
3032 // __block variables need to have the rhs evaluated first, plus
3033 // this should improve codegen just a little.
3034 RHS = Visit(E->getRHS());
3035 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3037 // Store the value into the LHS. Bit-fields are handled specially
3038 // because the result is altered by the store, i.e., [C99 6.5.16p1]
3039 // 'An assignment expression has the value of the left operand after
3040 // the assignment...'.
3041 if (LHS.isBitField())
3042 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
3044 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
3047 // If the result is clearly ignored, return now.
3051 // The result of an assignment in C is the assigned r-value.
3052 if (!CGF.getLangOpts().CPlusPlus)
3055 // If the lvalue is non-volatile, return the computed value of the assignment.
3056 if (!LHS.isVolatileQualified())
3059 // Otherwise, reload the value.
3060 return EmitLoadOfLValue(LHS, E->getExprLoc());
3063 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
3064 // Perform vector logical and on comparisons with zero vectors.
3065 if (E->getType()->isVectorType()) {
3066 CGF.incrementProfileCounter(E);
3068 Value *LHS = Visit(E->getLHS());
3069 Value *RHS = Visit(E->getRHS());
3070 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3071 if (LHS->getType()->isFPOrFPVectorTy()) {
3072 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3073 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3075 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3076 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3078 Value *And = Builder.CreateAnd(LHS, RHS);
3079 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
3082 llvm::Type *ResTy = ConvertType(E->getType());
3084 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
3085 // If we have 1 && X, just emit X without inserting the control flow.
3087 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3088 if (LHSCondVal) { // If we have 1 && X, just emit X.
3089 CGF.incrementProfileCounter(E);
3091 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3092 // ZExt result to int or bool.
3093 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
3096 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
3097 if (!CGF.ContainsLabel(E->getRHS()))
3098 return llvm::Constant::getNullValue(ResTy);
3101 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
3102 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
3104 CodeGenFunction::ConditionalEvaluation eval(CGF);
3106 // Branch on the LHS first. If it is false, go to the failure (cont) block.
3107 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock,
3108 CGF.getProfileCount(E->getRHS()));
3110 // Any edges into the ContBlock are now from an (indeterminate number of)
3111 // edges from this first condition. All of these values will be false. Start
3112 // setting up the PHI node in the Cont Block for this.
3113 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3115 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3117 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
3120 CGF.EmitBlock(RHSBlock);
3121 CGF.incrementProfileCounter(E);
3122 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3125 // Reaquire the RHS block, as there may be subblocks inserted.
3126 RHSBlock = Builder.GetInsertBlock();
3128 // Emit an unconditional branch from this block to ContBlock.
3130 // There is no need to emit line number for unconditional branch.
3131 auto NL = ApplyDebugLocation::CreateEmpty(CGF);
3132 CGF.EmitBlock(ContBlock);
3134 // Insert an entry into the phi node for the edge with the value of RHSCond.
3135 PN->addIncoming(RHSCond, RHSBlock);
3137 // ZExt result to int.
3138 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
3141 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
3142 // Perform vector logical or on comparisons with zero vectors.
3143 if (E->getType()->isVectorType()) {
3144 CGF.incrementProfileCounter(E);
3146 Value *LHS = Visit(E->getLHS());
3147 Value *RHS = Visit(E->getRHS());
3148 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3149 if (LHS->getType()->isFPOrFPVectorTy()) {
3150 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3151 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3153 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3154 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3156 Value *Or = Builder.CreateOr(LHS, RHS);
3157 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
3160 llvm::Type *ResTy = ConvertType(E->getType());
3162 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
3163 // If we have 0 || X, just emit X without inserting the control flow.
3165 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3166 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3167 CGF.incrementProfileCounter(E);
3169 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3170 // ZExt result to int or bool.
3171 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3174 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3175 if (!CGF.ContainsLabel(E->getRHS()))
3176 return llvm::ConstantInt::get(ResTy, 1);
3179 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3180 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3182 CodeGenFunction::ConditionalEvaluation eval(CGF);
3184 // Branch on the LHS first. If it is true, go to the success (cont) block.
3185 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3186 CGF.getCurrentProfileCount() -
3187 CGF.getProfileCount(E->getRHS()));
3189 // Any edges into the ContBlock are now from an (indeterminate number of)
3190 // edges from this first condition. All of these values will be true. Start
3191 // setting up the PHI node in the Cont Block for this.
3192 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3194 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3196 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3200 // Emit the RHS condition as a bool value.
3201 CGF.EmitBlock(RHSBlock);
3202 CGF.incrementProfileCounter(E);
3203 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3207 // Reaquire the RHS block, as there may be subblocks inserted.
3208 RHSBlock = Builder.GetInsertBlock();
3210 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3211 // into the phi node for the edge with the value of RHSCond.
3212 CGF.EmitBlock(ContBlock);
3213 PN->addIncoming(RHSCond, RHSBlock);
3215 // ZExt result to int.
3216 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3219 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3220 CGF.EmitIgnoredExpr(E->getLHS());
3221 CGF.EnsureInsertPoint();
3222 return Visit(E->getRHS());
3225 //===----------------------------------------------------------------------===//
3227 //===----------------------------------------------------------------------===//
3229 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3230 /// expression is cheap enough and side-effect-free enough to evaluate
3231 /// unconditionally instead of conditionally. This is used to convert control
3232 /// flow into selects in some cases.
3233 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3234 CodeGenFunction &CGF) {
3235 // Anything that is an integer or floating point constant is fine.
3236 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3238 // Even non-volatile automatic variables can't be evaluated unconditionally.
3239 // Referencing a thread_local may cause non-trivial initialization work to
3240 // occur. If we're inside a lambda and one of the variables is from the scope
3241 // outside the lambda, that function may have returned already. Reading its
3242 // locals is a bad idea. Also, these reads may introduce races there didn't
3243 // exist in the source-level program.
3247 Value *ScalarExprEmitter::
3248 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3249 TestAndClearIgnoreResultAssign();
3251 // Bind the common expression if necessary.
3252 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3254 Expr *condExpr = E->getCond();
3255 Expr *lhsExpr = E->getTrueExpr();
3256 Expr *rhsExpr = E->getFalseExpr();
3258 // If the condition constant folds and can be elided, try to avoid emitting
3259 // the condition and the dead arm.
3261 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3262 Expr *live = lhsExpr, *dead = rhsExpr;
3263 if (!CondExprBool) std::swap(live, dead);
3265 // If the dead side doesn't have labels we need, just emit the Live part.
3266 if (!CGF.ContainsLabel(dead)) {
3268 CGF.incrementProfileCounter(E);
3269 Value *Result = Visit(live);
3271 // If the live part is a throw expression, it acts like it has a void
3272 // type, so evaluating it returns a null Value*. However, a conditional
3273 // with non-void type must return a non-null Value*.
3274 if (!Result && !E->getType()->isVoidType())
3275 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3281 // OpenCL: If the condition is a vector, we can treat this condition like
3282 // the select function.
3283 if (CGF.getLangOpts().OpenCL
3284 && condExpr->getType()->isVectorType()) {
3285 CGF.incrementProfileCounter(E);
3287 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3288 llvm::Value *LHS = Visit(lhsExpr);
3289 llvm::Value *RHS = Visit(rhsExpr);
3291 llvm::Type *condType = ConvertType(condExpr->getType());
3292 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3294 unsigned numElem = vecTy->getNumElements();
3295 llvm::Type *elemType = vecTy->getElementType();
3297 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3298 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3299 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3300 llvm::VectorType::get(elemType,
3303 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3305 // Cast float to int to perform ANDs if necessary.
3306 llvm::Value *RHSTmp = RHS;
3307 llvm::Value *LHSTmp = LHS;
3308 bool wasCast = false;
3309 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3310 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3311 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3312 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3316 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3317 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3318 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3320 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3325 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3326 // select instead of as control flow. We can only do this if it is cheap and
3327 // safe to evaluate the LHS and RHS unconditionally.
3328 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3329 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3330 CGF.incrementProfileCounter(E);
3332 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3333 llvm::Value *LHS = Visit(lhsExpr);
3334 llvm::Value *RHS = Visit(rhsExpr);
3336 // If the conditional has void type, make sure we return a null Value*.
3337 assert(!RHS && "LHS and RHS types must match");
3340 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3343 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3344 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3345 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3347 CodeGenFunction::ConditionalEvaluation eval(CGF);
3348 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
3349 CGF.getProfileCount(lhsExpr));
3351 CGF.EmitBlock(LHSBlock);
3352 CGF.incrementProfileCounter(E);
3354 Value *LHS = Visit(lhsExpr);
3357 LHSBlock = Builder.GetInsertBlock();
3358 Builder.CreateBr(ContBlock);
3360 CGF.EmitBlock(RHSBlock);
3362 Value *RHS = Visit(rhsExpr);
3365 RHSBlock = Builder.GetInsertBlock();
3366 CGF.EmitBlock(ContBlock);
3368 // If the LHS or RHS is a throw expression, it will be legitimately null.
3374 // Create a PHI node for the real part.
3375 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3376 PN->addIncoming(LHS, LHSBlock);
3377 PN->addIncoming(RHS, RHSBlock);
3381 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3382 return Visit(E->getChosenSubExpr());
3385 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3386 QualType Ty = VE->getType();
3388 if (Ty->isVariablyModifiedType())
3389 CGF.EmitVariablyModifiedType(Ty);
3391 Address ArgValue = Address::invalid();
3392 Address ArgPtr = CGF.EmitVAArg(VE, ArgValue);
3394 llvm::Type *ArgTy = ConvertType(VE->getType());
3396 // If EmitVAArg fails, emit an error.
3397 if (!ArgPtr.isValid()) {
3398 CGF.ErrorUnsupported(VE, "va_arg expression");
3399 return llvm::UndefValue::get(ArgTy);
3402 // FIXME Volatility.
3403 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3405 // If EmitVAArg promoted the type, we must truncate it.
3406 if (ArgTy != Val->getType()) {
3407 if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy())
3408 Val = Builder.CreateIntToPtr(Val, ArgTy);
3410 Val = Builder.CreateTrunc(Val, ArgTy);
3416 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3417 return CGF.EmitBlockLiteral(block);
3420 // Convert a vec3 to vec4, or vice versa.
3421 static Value *ConvertVec3AndVec4(CGBuilderTy &Builder, CodeGenFunction &CGF,
3422 Value *Src, unsigned NumElementsDst) {
3423 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3424 SmallVector<llvm::Constant*, 4> Args;
3425 Args.push_back(Builder.getInt32(0));
3426 Args.push_back(Builder.getInt32(1));
3427 Args.push_back(Builder.getInt32(2));
3428 if (NumElementsDst == 4)
3429 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3430 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3431 return Builder.CreateShuffleVector(Src, UnV, Mask);
3434 // Create cast instructions for converting LLVM value \p Src to LLVM type \p
3435 // DstTy. \p Src has the same size as \p DstTy. Both are single value types
3436 // but could be scalar or vectors of different lengths, and either can be
3438 // There are 4 cases:
3439 // 1. non-pointer -> non-pointer : needs 1 bitcast
3440 // 2. pointer -> pointer : needs 1 bitcast or addrspacecast
3441 // 3. pointer -> non-pointer
3442 // a) pointer -> intptr_t : needs 1 ptrtoint
3443 // b) pointer -> non-intptr_t : needs 1 ptrtoint then 1 bitcast
3444 // 4. non-pointer -> pointer
3445 // a) intptr_t -> pointer : needs 1 inttoptr
3446 // b) non-intptr_t -> pointer : needs 1 bitcast then 1 inttoptr
3447 // Note: for cases 3b and 4b two casts are required since LLVM casts do not
3448 // allow casting directly between pointer types and non-integer non-pointer
3450 static Value *createCastsForTypeOfSameSize(CGBuilderTy &Builder,
3451 const llvm::DataLayout &DL,
3452 Value *Src, llvm::Type *DstTy,
3453 StringRef Name = "") {
3454 auto SrcTy = Src->getType();
3457 if (!SrcTy->isPointerTy() && !DstTy->isPointerTy())
3458 return Builder.CreateBitCast(Src, DstTy, Name);
3461 if (SrcTy->isPointerTy() && DstTy->isPointerTy())
3462 return Builder.CreatePointerBitCastOrAddrSpaceCast(Src, DstTy, Name);
3465 if (SrcTy->isPointerTy() && !DstTy->isPointerTy()) {
3467 if (!DstTy->isIntegerTy())
3468 Src = Builder.CreatePtrToInt(Src, DL.getIntPtrType(SrcTy));
3470 return Builder.CreateBitOrPointerCast(Src, DstTy, Name);
3474 if (!SrcTy->isIntegerTy())
3475 Src = Builder.CreateBitCast(Src, DL.getIntPtrType(DstTy));
3477 return Builder.CreateIntToPtr(Src, DstTy, Name);
3480 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3481 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3482 llvm::Type *DstTy = ConvertType(E->getType());
3484 llvm::Type *SrcTy = Src->getType();
3485 unsigned NumElementsSrc = isa<llvm::VectorType>(SrcTy) ?
3486 cast<llvm::VectorType>(SrcTy)->getNumElements() : 0;
3487 unsigned NumElementsDst = isa<llvm::VectorType>(DstTy) ?
3488 cast<llvm::VectorType>(DstTy)->getNumElements() : 0;
3490 // Going from vec3 to non-vec3 is a special case and requires a shuffle
3491 // vector to get a vec4, then a bitcast if the target type is different.
3492 if (NumElementsSrc == 3 && NumElementsDst != 3) {
3493 Src = ConvertVec3AndVec4(Builder, CGF, Src, 4);
3494 Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src,
3496 Src->setName("astype");
3500 // Going from non-vec3 to vec3 is a special case and requires a bitcast
3501 // to vec4 if the original type is not vec4, then a shuffle vector to
3503 if (NumElementsSrc != 3 && NumElementsDst == 3) {
3504 auto Vec4Ty = llvm::VectorType::get(DstTy->getVectorElementType(), 4);
3505 Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src,
3507 Src = ConvertVec3AndVec4(Builder, CGF, Src, 3);
3508 Src->setName("astype");
3512 return Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(),
3513 Src, DstTy, "astype");
3516 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3517 return CGF.EmitAtomicExpr(E).getScalarVal();
3520 //===----------------------------------------------------------------------===//
3521 // Entry Point into this File
3522 //===----------------------------------------------------------------------===//
3524 /// Emit the computation of the specified expression of scalar type, ignoring
3526 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3527 assert(E && hasScalarEvaluationKind(E->getType()) &&
3528 "Invalid scalar expression to emit");
3530 return ScalarExprEmitter(*this, IgnoreResultAssign)
3531 .Visit(const_cast<Expr *>(E));
3534 /// Emit a conversion from the specified type to the specified destination type,
3535 /// both of which are LLVM scalar types.
3536 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3538 SourceLocation Loc) {
3539 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3540 "Invalid scalar expression to emit");
3541 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc);
3544 /// Emit a conversion from the specified complex type to the specified
3545 /// destination type, where the destination type is an LLVM scalar type.
3546 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3549 SourceLocation Loc) {
3550 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3551 "Invalid complex -> scalar conversion");
3552 return ScalarExprEmitter(*this)
3553 .EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc);
3557 llvm::Value *CodeGenFunction::
3558 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3559 bool isInc, bool isPre) {
3560 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3563 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3564 // object->isa or (*object).isa
3565 // Generate code as for: *(Class*)object
3567 Expr *BaseExpr = E->getBase();
3568 Address Addr = Address::invalid();
3569 if (BaseExpr->isRValue()) {
3570 Addr = Address(EmitScalarExpr(BaseExpr), getPointerAlign());
3572 Addr = EmitLValue(BaseExpr).getAddress();
3575 // Cast the address to Class*.
3576 Addr = Builder.CreateElementBitCast(Addr, ConvertType(E->getType()));
3577 return MakeAddrLValue(Addr, E->getType());
3581 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3582 const CompoundAssignOperator *E) {
3583 ScalarExprEmitter Scalar(*this);
3584 Value *Result = nullptr;
3585 switch (E->getOpcode()) {
3586 #define COMPOUND_OP(Op) \
3587 case BO_##Op##Assign: \
3588 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3624 llvm_unreachable("Not valid compound assignment operators");
3627 llvm_unreachable("Unhandled compound assignment operator");