1 //===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This contains code to emit Expr nodes with scalar LLVM types as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
16 #include "CGDebugInfo.h"
17 #include "CGObjCRuntime.h"
18 #include "CodeGenModule.h"
19 #include "TargetInfo.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "clang/AST/StmtVisitor.h"
24 #include "clang/Basic/TargetInfo.h"
25 #include "clang/Frontend/CodeGenOptions.h"
26 #include "llvm/IR/CFG.h"
27 #include "llvm/IR/Constants.h"
28 #include "llvm/IR/DataLayout.h"
29 #include "llvm/IR/Function.h"
30 #include "llvm/IR/GlobalVariable.h"
31 #include "llvm/IR/Intrinsics.h"
32 #include "llvm/IR/Module.h"
35 using namespace clang;
36 using namespace CodeGen;
39 //===----------------------------------------------------------------------===//
40 // Scalar Expression Emitter
41 //===----------------------------------------------------------------------===//
47 QualType Ty; // Computation Type.
48 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
50 const Expr *E; // Entire expr, for error unsupported. May not be binop.
53 static bool MustVisitNullValue(const Expr *E) {
54 // If a null pointer expression's type is the C++0x nullptr_t, then
55 // it's not necessarily a simple constant and it must be evaluated
56 // for its potential side effects.
57 return E->getType()->isNullPtrType();
60 class ScalarExprEmitter
61 : public StmtVisitor<ScalarExprEmitter, Value*> {
64 bool IgnoreResultAssign;
65 llvm::LLVMContext &VMContext;
68 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
69 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
70 VMContext(cgf.getLLVMContext()) {
73 //===--------------------------------------------------------------------===//
75 //===--------------------------------------------------------------------===//
77 bool TestAndClearIgnoreResultAssign() {
78 bool I = IgnoreResultAssign;
79 IgnoreResultAssign = false;
83 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
84 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
85 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
86 return CGF.EmitCheckedLValue(E, TCK);
89 void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks,
90 const BinOpInfo &Info);
92 Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
93 return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
96 void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
97 const AlignValueAttr *AVAttr = nullptr;
98 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
99 const ValueDecl *VD = DRE->getDecl();
101 if (VD->getType()->isReferenceType()) {
102 if (const auto *TTy =
103 dyn_cast<TypedefType>(VD->getType().getNonReferenceType()))
104 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
106 // Assumptions for function parameters are emitted at the start of the
107 // function, so there is no need to repeat that here.
108 if (isa<ParmVarDecl>(VD))
111 AVAttr = VD->getAttr<AlignValueAttr>();
116 if (const auto *TTy =
117 dyn_cast<TypedefType>(E->getType()))
118 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
123 Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
124 llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
125 CGF.EmitAlignmentAssumption(V, AlignmentCI->getZExtValue());
128 /// EmitLoadOfLValue - Given an expression with complex type that represents a
129 /// value l-value, this method emits the address of the l-value, then loads
130 /// and returns the result.
131 Value *EmitLoadOfLValue(const Expr *E) {
132 Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
135 EmitLValueAlignmentAssumption(E, V);
139 /// EmitConversionToBool - Convert the specified expression value to a
140 /// boolean (i1) truth value. This is equivalent to "Val != 0".
141 Value *EmitConversionToBool(Value *Src, QualType DstTy);
143 /// Emit a check that a conversion to or from a floating-point type does not
145 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
146 Value *Src, QualType SrcType, QualType DstType,
147 llvm::Type *DstTy, SourceLocation Loc);
149 /// Emit a conversion from the specified type to the specified destination
150 /// type, both of which are LLVM scalar types.
151 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
154 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
155 SourceLocation Loc, bool TreatBooleanAsSigned);
157 /// Emit a conversion from the specified complex type to the specified
158 /// destination type, where the destination type is an LLVM scalar type.
159 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
160 QualType SrcTy, QualType DstTy,
163 /// EmitNullValue - Emit a value that corresponds to null for the given type.
164 Value *EmitNullValue(QualType Ty);
166 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
167 Value *EmitFloatToBoolConversion(Value *V) {
168 // Compare against 0.0 for fp scalars.
169 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
170 return Builder.CreateFCmpUNE(V, Zero, "tobool");
173 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
174 Value *EmitPointerToBoolConversion(Value *V) {
175 Value *Zero = llvm::ConstantPointerNull::get(
176 cast<llvm::PointerType>(V->getType()));
177 return Builder.CreateICmpNE(V, Zero, "tobool");
180 Value *EmitIntToBoolConversion(Value *V) {
181 // Because of the type rules of C, we often end up computing a
182 // logical value, then zero extending it to int, then wanting it
183 // as a logical value again. Optimize this common case.
184 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
185 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
186 Value *Result = ZI->getOperand(0);
187 // If there aren't any more uses, zap the instruction to save space.
188 // Note that there can be more uses, for example if this
189 // is the result of an assignment.
191 ZI->eraseFromParent();
196 return Builder.CreateIsNotNull(V, "tobool");
199 //===--------------------------------------------------------------------===//
201 //===--------------------------------------------------------------------===//
203 Value *Visit(Expr *E) {
204 ApplyDebugLocation DL(CGF, E);
205 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
208 Value *VisitStmt(Stmt *S) {
209 S->dump(CGF.getContext().getSourceManager());
210 llvm_unreachable("Stmt can't have complex result type!");
212 Value *VisitExpr(Expr *S);
214 Value *VisitParenExpr(ParenExpr *PE) {
215 return Visit(PE->getSubExpr());
217 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
218 return Visit(E->getReplacement());
220 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
221 return Visit(GE->getResultExpr());
225 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
226 return Builder.getInt(E->getValue());
228 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
229 return llvm::ConstantFP::get(VMContext, E->getValue());
231 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
232 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
234 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
235 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
237 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
238 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
240 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
241 return EmitNullValue(E->getType());
243 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
244 return EmitNullValue(E->getType());
246 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
247 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
248 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
249 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
250 return Builder.CreateBitCast(V, ConvertType(E->getType()));
253 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
254 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
257 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
258 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
261 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
263 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E), E->getExprLoc());
265 // Otherwise, assume the mapping is the scalar directly.
266 return CGF.getOpaqueRValueMapping(E).getScalarVal();
270 Value *VisitDeclRefExpr(DeclRefExpr *E) {
271 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
272 if (result.isReference())
273 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E),
275 return result.getValue();
277 return EmitLoadOfLValue(E);
280 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
281 return CGF.EmitObjCSelectorExpr(E);
283 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
284 return CGF.EmitObjCProtocolExpr(E);
286 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
287 return EmitLoadOfLValue(E);
289 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
290 if (E->getMethodDecl() &&
291 E->getMethodDecl()->getReturnType()->isReferenceType())
292 return EmitLoadOfLValue(E);
293 return CGF.EmitObjCMessageExpr(E).getScalarVal();
296 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
297 LValue LV = CGF.EmitObjCIsaExpr(E);
298 Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
302 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
303 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
304 Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
305 Value *VisitMemberExpr(MemberExpr *E);
306 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
307 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
308 return EmitLoadOfLValue(E);
311 Value *VisitInitListExpr(InitListExpr *E);
313 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
314 return EmitNullValue(E->getType());
316 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
317 CGF.CGM.EmitExplicitCastExprType(E, &CGF);
318 return VisitCastExpr(E);
320 Value *VisitCastExpr(CastExpr *E);
322 Value *VisitCallExpr(const CallExpr *E) {
323 if (E->getCallReturnType(CGF.getContext())->isReferenceType())
324 return EmitLoadOfLValue(E);
326 Value *V = CGF.EmitCallExpr(E).getScalarVal();
328 EmitLValueAlignmentAssumption(E, V);
332 Value *VisitStmtExpr(const StmtExpr *E);
335 Value *VisitUnaryPostDec(const UnaryOperator *E) {
336 LValue LV = EmitLValue(E->getSubExpr());
337 return EmitScalarPrePostIncDec(E, LV, false, false);
339 Value *VisitUnaryPostInc(const UnaryOperator *E) {
340 LValue LV = EmitLValue(E->getSubExpr());
341 return EmitScalarPrePostIncDec(E, LV, true, false);
343 Value *VisitUnaryPreDec(const UnaryOperator *E) {
344 LValue LV = EmitLValue(E->getSubExpr());
345 return EmitScalarPrePostIncDec(E, LV, false, true);
347 Value *VisitUnaryPreInc(const UnaryOperator *E) {
348 LValue LV = EmitLValue(E->getSubExpr());
349 return EmitScalarPrePostIncDec(E, LV, true, true);
352 llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E,
356 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
357 bool isInc, bool isPre);
360 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
361 if (isa<MemberPointerType>(E->getType())) // never sugared
362 return CGF.CGM.getMemberPointerConstant(E);
364 return EmitLValue(E->getSubExpr()).getPointer();
366 Value *VisitUnaryDeref(const UnaryOperator *E) {
367 if (E->getType()->isVoidType())
368 return Visit(E->getSubExpr()); // the actual value should be unused
369 return EmitLoadOfLValue(E);
371 Value *VisitUnaryPlus(const UnaryOperator *E) {
372 // This differs from gcc, though, most likely due to a bug in gcc.
373 TestAndClearIgnoreResultAssign();
374 return Visit(E->getSubExpr());
376 Value *VisitUnaryMinus (const UnaryOperator *E);
377 Value *VisitUnaryNot (const UnaryOperator *E);
378 Value *VisitUnaryLNot (const UnaryOperator *E);
379 Value *VisitUnaryReal (const UnaryOperator *E);
380 Value *VisitUnaryImag (const UnaryOperator *E);
381 Value *VisitUnaryExtension(const UnaryOperator *E) {
382 return Visit(E->getSubExpr());
386 Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
387 return EmitLoadOfLValue(E);
390 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
391 return Visit(DAE->getExpr());
393 Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
394 CodeGenFunction::CXXDefaultInitExprScope Scope(CGF);
395 return Visit(DIE->getExpr());
397 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
398 return CGF.LoadCXXThis();
401 Value *VisitExprWithCleanups(ExprWithCleanups *E) {
402 CGF.enterFullExpression(E);
403 CodeGenFunction::RunCleanupsScope Scope(CGF);
404 return Visit(E->getSubExpr());
406 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
407 return CGF.EmitCXXNewExpr(E);
409 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
410 CGF.EmitCXXDeleteExpr(E);
414 Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
415 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
418 Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
419 return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue());
422 Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
423 return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
426 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
427 // C++ [expr.pseudo]p1:
428 // The result shall only be used as the operand for the function call
429 // operator (), and the result of such a call has type void. The only
430 // effect is the evaluation of the postfix-expression before the dot or
432 CGF.EmitScalarExpr(E->getBase());
436 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
437 return EmitNullValue(E->getType());
440 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
441 CGF.EmitCXXThrowExpr(E);
445 Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
446 return Builder.getInt1(E->getValue());
450 Value *EmitMul(const BinOpInfo &Ops) {
451 if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
452 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
453 case LangOptions::SOB_Defined:
454 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
455 case LangOptions::SOB_Undefined:
456 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
457 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
459 case LangOptions::SOB_Trapping:
460 return EmitOverflowCheckedBinOp(Ops);
464 if (Ops.Ty->isUnsignedIntegerType() &&
465 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
466 return EmitOverflowCheckedBinOp(Ops);
468 if (Ops.LHS->getType()->isFPOrFPVectorTy())
469 return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
470 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
472 /// Create a binary op that checks for overflow.
473 /// Currently only supports +, - and *.
474 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
476 // Check for undefined division and modulus behaviors.
477 void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
478 llvm::Value *Zero,bool isDiv);
479 // Common helper for getting how wide LHS of shift is.
480 static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS);
481 Value *EmitDiv(const BinOpInfo &Ops);
482 Value *EmitRem(const BinOpInfo &Ops);
483 Value *EmitAdd(const BinOpInfo &Ops);
484 Value *EmitSub(const BinOpInfo &Ops);
485 Value *EmitShl(const BinOpInfo &Ops);
486 Value *EmitShr(const BinOpInfo &Ops);
487 Value *EmitAnd(const BinOpInfo &Ops) {
488 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
490 Value *EmitXor(const BinOpInfo &Ops) {
491 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
493 Value *EmitOr (const BinOpInfo &Ops) {
494 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
497 BinOpInfo EmitBinOps(const BinaryOperator *E);
498 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
499 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
502 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
503 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
505 // Binary operators and binary compound assignment operators.
506 #define HANDLEBINOP(OP) \
507 Value *VisitBin ## OP(const BinaryOperator *E) { \
508 return Emit ## OP(EmitBinOps(E)); \
510 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
511 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
526 Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc,
527 llvm::CmpInst::Predicate SICmpOpc,
528 llvm::CmpInst::Predicate FCmpOpc);
529 #define VISITCOMP(CODE, UI, SI, FP) \
530 Value *VisitBin##CODE(const BinaryOperator *E) { \
531 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
532 llvm::FCmpInst::FP); }
533 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
534 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
535 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
536 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
537 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
538 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
541 Value *VisitBinAssign (const BinaryOperator *E);
543 Value *VisitBinLAnd (const BinaryOperator *E);
544 Value *VisitBinLOr (const BinaryOperator *E);
545 Value *VisitBinComma (const BinaryOperator *E);
547 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
548 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
551 Value *VisitBlockExpr(const BlockExpr *BE);
552 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
553 Value *VisitChooseExpr(ChooseExpr *CE);
554 Value *VisitVAArgExpr(VAArgExpr *VE);
555 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
556 return CGF.EmitObjCStringLiteral(E);
558 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
559 return CGF.EmitObjCBoxedExpr(E);
561 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
562 return CGF.EmitObjCArrayLiteral(E);
564 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
565 return CGF.EmitObjCDictionaryLiteral(E);
567 Value *VisitAsTypeExpr(AsTypeExpr *CE);
568 Value *VisitAtomicExpr(AtomicExpr *AE);
570 } // end anonymous namespace.
572 //===----------------------------------------------------------------------===//
574 //===----------------------------------------------------------------------===//
576 /// EmitConversionToBool - Convert the specified expression value to a
577 /// boolean (i1) truth value. This is equivalent to "Val != 0".
578 Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
579 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
581 if (SrcType->isRealFloatingType())
582 return EmitFloatToBoolConversion(Src);
584 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
585 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
587 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
588 "Unknown scalar type to convert");
590 if (isa<llvm::IntegerType>(Src->getType()))
591 return EmitIntToBoolConversion(Src);
593 assert(isa<llvm::PointerType>(Src->getType()));
594 return EmitPointerToBoolConversion(Src);
597 void ScalarExprEmitter::EmitFloatConversionCheck(
598 Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType,
599 QualType DstType, llvm::Type *DstTy, SourceLocation Loc) {
600 CodeGenFunction::SanitizerScope SanScope(&CGF);
604 llvm::Type *SrcTy = Src->getType();
606 llvm::Value *Check = nullptr;
607 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
608 // Integer to floating-point. This can fail for unsigned short -> __half
609 // or unsigned __int128 -> float.
610 assert(DstType->isFloatingType());
611 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
613 APFloat LargestFloat =
614 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
615 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
618 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
619 &IsExact) != APFloat::opOK)
620 // The range of representable values of this floating point type includes
621 // all values of this integer type. Don't need an overflow check.
624 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
626 Check = Builder.CreateICmpULE(Src, Max);
628 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
629 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
630 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
631 Check = Builder.CreateAnd(GE, LE);
634 const llvm::fltSemantics &SrcSema =
635 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
636 if (isa<llvm::IntegerType>(DstTy)) {
637 // Floating-point to integer. This has undefined behavior if the source is
638 // +-Inf, NaN, or doesn't fit into the destination type (after truncation
640 unsigned Width = CGF.getContext().getIntWidth(DstType);
641 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
643 APSInt Min = APSInt::getMinValue(Width, Unsigned);
644 APFloat MinSrc(SrcSema, APFloat::uninitialized);
645 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
647 // Don't need an overflow check for lower bound. Just check for
649 MinSrc = APFloat::getInf(SrcSema, true);
651 // Find the largest value which is too small to represent (before
652 // truncation toward zero).
653 MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
655 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
656 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
657 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
659 // Don't need an overflow check for upper bound. Just check for
661 MaxSrc = APFloat::getInf(SrcSema, false);
663 // Find the smallest value which is too large to represent (before
664 // truncation toward zero).
665 MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
667 // If we're converting from __half, convert the range to float to match
669 if (OrigSrcType->isHalfType()) {
670 const llvm::fltSemantics &Sema =
671 CGF.getContext().getFloatTypeSemantics(SrcType);
673 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
674 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
678 Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
680 Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
681 Check = Builder.CreateAnd(GE, LE);
683 // FIXME: Maybe split this sanitizer out from float-cast-overflow.
685 // Floating-point to floating-point. This has undefined behavior if the
686 // source is not in the range of representable values of the destination
687 // type. The C and C++ standards are spectacularly unclear here. We
688 // diagnose finite out-of-range conversions, but allow infinities and NaNs
689 // to convert to the corresponding value in the smaller type.
691 // C11 Annex F gives all such conversions defined behavior for IEC 60559
692 // conforming implementations. Unfortunately, LLVM's fptrunc instruction
695 // Converting from a lower rank to a higher rank can never have
696 // undefined behavior, since higher-rank types must have a superset
697 // of values of lower-rank types.
698 if (CGF.getContext().getFloatingTypeOrder(OrigSrcType, DstType) != 1)
701 assert(!OrigSrcType->isHalfType() &&
702 "should not check conversion from __half, it has the lowest rank");
704 const llvm::fltSemantics &DstSema =
705 CGF.getContext().getFloatTypeSemantics(DstType);
706 APFloat MinBad = APFloat::getLargest(DstSema, false);
707 APFloat MaxBad = APFloat::getInf(DstSema, false);
710 MinBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
711 MaxBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
713 Value *AbsSrc = CGF.EmitNounwindRuntimeCall(
714 CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Src->getType()), Src);
716 Builder.CreateFCmpOGT(AbsSrc, llvm::ConstantFP::get(VMContext, MinBad));
718 Builder.CreateFCmpOLT(AbsSrc, llvm::ConstantFP::get(VMContext, MaxBad));
719 Check = Builder.CreateNot(Builder.CreateAnd(GE, LE));
723 llvm::Constant *StaticArgs[] = {CGF.EmitCheckSourceLocation(Loc),
724 CGF.EmitCheckTypeDescriptor(OrigSrcType),
725 CGF.EmitCheckTypeDescriptor(DstType)};
726 CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow),
727 "float_cast_overflow", StaticArgs, OrigSrc);
730 /// Emit a conversion from the specified type to the specified destination type,
731 /// both of which are LLVM scalar types.
732 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
734 SourceLocation Loc) {
735 return EmitScalarConversion(Src, SrcType, DstType, Loc, false);
738 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
741 bool TreatBooleanAsSigned) {
742 SrcType = CGF.getContext().getCanonicalType(SrcType);
743 DstType = CGF.getContext().getCanonicalType(DstType);
744 if (SrcType == DstType) return Src;
746 if (DstType->isVoidType()) return nullptr;
748 llvm::Value *OrigSrc = Src;
749 QualType OrigSrcType = SrcType;
750 llvm::Type *SrcTy = Src->getType();
752 // Handle conversions to bool first, they are special: comparisons against 0.
753 if (DstType->isBooleanType())
754 return EmitConversionToBool(Src, SrcType);
756 llvm::Type *DstTy = ConvertType(DstType);
758 // Cast from half through float if half isn't a native type.
759 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
760 // Cast to FP using the intrinsic if the half type itself isn't supported.
761 if (DstTy->isFloatingPointTy()) {
762 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
763 return Builder.CreateCall(
764 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy),
767 // Cast to other types through float, using either the intrinsic or FPExt,
768 // depending on whether the half type itself is supported
769 // (as opposed to operations on half, available with NativeHalfType).
770 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
771 Src = Builder.CreateCall(
772 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
776 Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv");
778 SrcType = CGF.getContext().FloatTy;
783 // Ignore conversions like int -> uint.
787 // Handle pointer conversions next: pointers can only be converted to/from
788 // other pointers and integers. Check for pointer types in terms of LLVM, as
789 // some native types (like Obj-C id) may map to a pointer type.
790 if (isa<llvm::PointerType>(DstTy)) {
791 // The source value may be an integer, or a pointer.
792 if (isa<llvm::PointerType>(SrcTy))
793 return Builder.CreateBitCast(Src, DstTy, "conv");
795 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
796 // First, convert to the correct width so that we control the kind of
798 llvm::Type *MiddleTy = CGF.IntPtrTy;
799 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
800 llvm::Value* IntResult =
801 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
802 // Then, cast to pointer.
803 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
806 if (isa<llvm::PointerType>(SrcTy)) {
807 // Must be an ptr to int cast.
808 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
809 return Builder.CreatePtrToInt(Src, DstTy, "conv");
812 // A scalar can be splatted to an extended vector of the same element type
813 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
814 // Sema should add casts to make sure that the source expression's type is
815 // the same as the vector's element type (sans qualifiers)
816 assert(DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() ==
817 SrcType.getTypePtr() &&
818 "Splatted expr doesn't match with vector element type?");
820 // Splat the element across to all elements
821 unsigned NumElements = DstTy->getVectorNumElements();
822 return Builder.CreateVectorSplat(NumElements, Src, "splat");
825 // Allow bitcast from vector to integer/fp of the same size.
826 if (isa<llvm::VectorType>(SrcTy) ||
827 isa<llvm::VectorType>(DstTy))
828 return Builder.CreateBitCast(Src, DstTy, "conv");
830 // Finally, we have the arithmetic types: real int/float.
831 Value *Res = nullptr;
832 llvm::Type *ResTy = DstTy;
834 // An overflowing conversion has undefined behavior if either the source type
835 // or the destination type is a floating-point type.
836 if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) &&
837 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
838 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType, DstTy,
841 // Cast to half through float if half isn't a native type.
842 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
843 // Make sure we cast in a single step if from another FP type.
844 if (SrcTy->isFloatingPointTy()) {
845 // Use the intrinsic if the half type itself isn't supported
846 // (as opposed to operations on half, available with NativeHalfType).
847 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
848 return Builder.CreateCall(
849 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src);
850 // If the half type is supported, just use an fptrunc.
851 return Builder.CreateFPTrunc(Src, DstTy);
856 if (isa<llvm::IntegerType>(SrcTy)) {
857 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
858 if (SrcType->isBooleanType() && TreatBooleanAsSigned) {
861 if (isa<llvm::IntegerType>(DstTy))
862 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
863 else if (InputSigned)
864 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
866 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
867 } else if (isa<llvm::IntegerType>(DstTy)) {
868 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
869 if (DstType->isSignedIntegerOrEnumerationType())
870 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
872 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
874 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
875 "Unknown real conversion");
876 if (DstTy->getTypeID() < SrcTy->getTypeID())
877 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
879 Res = Builder.CreateFPExt(Src, DstTy, "conv");
882 if (DstTy != ResTy) {
883 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
884 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
885 Res = Builder.CreateCall(
886 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy),
889 Res = Builder.CreateFPTrunc(Res, ResTy, "conv");
896 /// Emit a conversion from the specified complex type to the specified
897 /// destination type, where the destination type is an LLVM scalar type.
898 Value *ScalarExprEmitter::EmitComplexToScalarConversion(
899 CodeGenFunction::ComplexPairTy Src, QualType SrcTy, QualType DstTy,
900 SourceLocation Loc) {
901 // Get the source element type.
902 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
904 // Handle conversions to bool first, they are special: comparisons against 0.
905 if (DstTy->isBooleanType()) {
906 // Complex != 0 -> (Real != 0) | (Imag != 0)
907 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
908 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy, Loc);
909 return Builder.CreateOr(Src.first, Src.second, "tobool");
912 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
913 // the imaginary part of the complex value is discarded and the value of the
914 // real part is converted according to the conversion rules for the
915 // corresponding real type.
916 return EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
919 Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
920 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
923 /// \brief Emit a sanitization check for the given "binary" operation (which
924 /// might actually be a unary increment which has been lowered to a binary
925 /// operation). The check passes if all values in \p Checks (which are \c i1),
927 void ScalarExprEmitter::EmitBinOpCheck(
928 ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) {
929 assert(CGF.IsSanitizerScope);
931 SmallVector<llvm::Constant *, 4> StaticData;
932 SmallVector<llvm::Value *, 2> DynamicData;
934 BinaryOperatorKind Opcode = Info.Opcode;
935 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
936 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
938 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
939 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
940 if (UO && UO->getOpcode() == UO_Minus) {
941 CheckName = "negate_overflow";
942 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
943 DynamicData.push_back(Info.RHS);
945 if (BinaryOperator::isShiftOp(Opcode)) {
946 // Shift LHS negative or too large, or RHS out of bounds.
947 CheckName = "shift_out_of_bounds";
948 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
949 StaticData.push_back(
950 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
951 StaticData.push_back(
952 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
953 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
954 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
955 CheckName = "divrem_overflow";
956 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
958 // Arithmetic overflow (+, -, *).
960 case BO_Add: CheckName = "add_overflow"; break;
961 case BO_Sub: CheckName = "sub_overflow"; break;
962 case BO_Mul: CheckName = "mul_overflow"; break;
963 default: llvm_unreachable("unexpected opcode for bin op check");
965 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
967 DynamicData.push_back(Info.LHS);
968 DynamicData.push_back(Info.RHS);
971 CGF.EmitCheck(Checks, CheckName, StaticData, DynamicData);
974 //===----------------------------------------------------------------------===//
976 //===----------------------------------------------------------------------===//
978 Value *ScalarExprEmitter::VisitExpr(Expr *E) {
979 CGF.ErrorUnsupported(E, "scalar expression");
980 if (E->getType()->isVoidType())
982 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
985 Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
987 if (E->getNumSubExprs() == 2) {
988 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
989 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
992 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
993 unsigned LHSElts = LTy->getNumElements();
997 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
999 // Mask off the high bits of each shuffle index.
1001 llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1);
1002 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
1005 // mask = mask & maskbits
1007 // n = extract mask i
1008 // x = extract val n
1009 // newv = insert newv, x, i
1010 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
1011 MTy->getNumElements());
1012 Value* NewV = llvm::UndefValue::get(RTy);
1013 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
1014 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
1015 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
1017 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
1018 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
1023 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
1024 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
1026 SmallVector<llvm::Constant*, 32> indices;
1027 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
1028 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
1029 // Check for -1 and output it as undef in the IR.
1030 if (Idx.isSigned() && Idx.isAllOnesValue())
1031 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
1033 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
1036 Value *SV = llvm::ConstantVector::get(indices);
1037 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
1040 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
1041 QualType SrcType = E->getSrcExpr()->getType(),
1042 DstType = E->getType();
1044 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
1046 SrcType = CGF.getContext().getCanonicalType(SrcType);
1047 DstType = CGF.getContext().getCanonicalType(DstType);
1048 if (SrcType == DstType) return Src;
1050 assert(SrcType->isVectorType() &&
1051 "ConvertVector source type must be a vector");
1052 assert(DstType->isVectorType() &&
1053 "ConvertVector destination type must be a vector");
1055 llvm::Type *SrcTy = Src->getType();
1056 llvm::Type *DstTy = ConvertType(DstType);
1058 // Ignore conversions like int -> uint.
1062 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
1063 DstEltType = DstType->getAs<VectorType>()->getElementType();
1065 assert(SrcTy->isVectorTy() &&
1066 "ConvertVector source IR type must be a vector");
1067 assert(DstTy->isVectorTy() &&
1068 "ConvertVector destination IR type must be a vector");
1070 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1071 *DstEltTy = DstTy->getVectorElementType();
1073 if (DstEltType->isBooleanType()) {
1074 assert((SrcEltTy->isFloatingPointTy() ||
1075 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1077 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1078 if (SrcEltTy->isFloatingPointTy()) {
1079 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1081 return Builder.CreateICmpNE(Src, Zero, "tobool");
1085 // We have the arithmetic types: real int/float.
1086 Value *Res = nullptr;
1088 if (isa<llvm::IntegerType>(SrcEltTy)) {
1089 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1090 if (isa<llvm::IntegerType>(DstEltTy))
1091 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1092 else if (InputSigned)
1093 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1095 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1096 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1097 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1098 if (DstEltType->isSignedIntegerOrEnumerationType())
1099 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1101 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1103 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1104 "Unknown real conversion");
1105 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1106 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1108 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1114 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1116 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1118 CGF.EmitScalarExpr(E->getBase());
1120 EmitLValue(E->getBase());
1121 return Builder.getInt(Value);
1124 return EmitLoadOfLValue(E);
1127 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1128 TestAndClearIgnoreResultAssign();
1130 // Emit subscript expressions in rvalue context's. For most cases, this just
1131 // loads the lvalue formed by the subscript expr. However, we have to be
1132 // careful, because the base of a vector subscript is occasionally an rvalue,
1133 // so we can't get it as an lvalue.
1134 if (!E->getBase()->getType()->isVectorType())
1135 return EmitLoadOfLValue(E);
1137 // Handle the vector case. The base must be a vector, the index must be an
1139 Value *Base = Visit(E->getBase());
1140 Value *Idx = Visit(E->getIdx());
1141 QualType IdxTy = E->getIdx()->getType();
1143 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
1144 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1146 return Builder.CreateExtractElement(Base, Idx, "vecext");
1149 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1150 unsigned Off, llvm::Type *I32Ty) {
1151 int MV = SVI->getMaskValue(Idx);
1153 return llvm::UndefValue::get(I32Ty);
1154 return llvm::ConstantInt::get(I32Ty, Off+MV);
1157 static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) {
1158 if (C->getBitWidth() != 32) {
1159 assert(llvm::ConstantInt::isValueValidForType(I32Ty,
1160 C->getZExtValue()) &&
1161 "Index operand too large for shufflevector mask!");
1162 return llvm::ConstantInt::get(I32Ty, C->getZExtValue());
1167 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1168 bool Ignore = TestAndClearIgnoreResultAssign();
1170 assert (Ignore == false && "init list ignored");
1171 unsigned NumInitElements = E->getNumInits();
1173 if (E->hadArrayRangeDesignator())
1174 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1176 llvm::VectorType *VType =
1177 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1180 if (NumInitElements == 0) {
1181 // C++11 value-initialization for the scalar.
1182 return EmitNullValue(E->getType());
1184 // We have a scalar in braces. Just use the first element.
1185 return Visit(E->getInit(0));
1188 unsigned ResElts = VType->getNumElements();
1190 // Loop over initializers collecting the Value for each, and remembering
1191 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1192 // us to fold the shuffle for the swizzle into the shuffle for the vector
1193 // initializer, since LLVM optimizers generally do not want to touch
1195 unsigned CurIdx = 0;
1196 bool VIsUndefShuffle = false;
1197 llvm::Value *V = llvm::UndefValue::get(VType);
1198 for (unsigned i = 0; i != NumInitElements; ++i) {
1199 Expr *IE = E->getInit(i);
1200 Value *Init = Visit(IE);
1201 SmallVector<llvm::Constant*, 16> Args;
1203 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1205 // Handle scalar elements. If the scalar initializer is actually one
1206 // element of a different vector of the same width, use shuffle instead of
1209 if (isa<ExtVectorElementExpr>(IE)) {
1210 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1212 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1213 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1214 Value *LHS = nullptr, *RHS = nullptr;
1216 // insert into undef -> shuffle (src, undef)
1217 // shufflemask must use an i32
1218 Args.push_back(getAsInt32(C, CGF.Int32Ty));
1219 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1221 LHS = EI->getVectorOperand();
1223 VIsUndefShuffle = true;
1224 } else if (VIsUndefShuffle) {
1225 // insert into undefshuffle && size match -> shuffle (v, src)
1226 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1227 for (unsigned j = 0; j != CurIdx; ++j)
1228 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1229 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1230 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1232 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1233 RHS = EI->getVectorOperand();
1234 VIsUndefShuffle = false;
1236 if (!Args.empty()) {
1237 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1238 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1244 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1246 VIsUndefShuffle = false;
1251 unsigned InitElts = VVT->getNumElements();
1253 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1254 // input is the same width as the vector being constructed, generate an
1255 // optimized shuffle of the swizzle input into the result.
1256 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1257 if (isa<ExtVectorElementExpr>(IE)) {
1258 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1259 Value *SVOp = SVI->getOperand(0);
1260 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1262 if (OpTy->getNumElements() == ResElts) {
1263 for (unsigned j = 0; j != CurIdx; ++j) {
1264 // If the current vector initializer is a shuffle with undef, merge
1265 // this shuffle directly into it.
1266 if (VIsUndefShuffle) {
1267 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1270 Args.push_back(Builder.getInt32(j));
1273 for (unsigned j = 0, je = InitElts; j != je; ++j)
1274 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1275 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1277 if (VIsUndefShuffle)
1278 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1284 // Extend init to result vector length, and then shuffle its contribution
1285 // to the vector initializer into V.
1287 for (unsigned j = 0; j != InitElts; ++j)
1288 Args.push_back(Builder.getInt32(j));
1289 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1290 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1291 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1295 for (unsigned j = 0; j != CurIdx; ++j)
1296 Args.push_back(Builder.getInt32(j));
1297 for (unsigned j = 0; j != InitElts; ++j)
1298 Args.push_back(Builder.getInt32(j+Offset));
1299 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1302 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1303 // merging subsequent shuffles into this one.
1306 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1307 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1308 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1312 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1313 // Emit remaining default initializers.
1314 llvm::Type *EltTy = VType->getElementType();
1316 // Emit remaining default initializers
1317 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1318 Value *Idx = Builder.getInt32(CurIdx);
1319 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1320 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1325 bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) {
1326 const Expr *E = CE->getSubExpr();
1328 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1331 if (isa<CXXThisExpr>(E->IgnoreParens())) {
1332 // We always assume that 'this' is never null.
1336 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1337 // And that glvalue casts are never null.
1338 if (ICE->getValueKind() != VK_RValue)
1345 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1346 // have to handle a more broad range of conversions than explicit casts, as they
1347 // handle things like function to ptr-to-function decay etc.
1348 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1349 Expr *E = CE->getSubExpr();
1350 QualType DestTy = CE->getType();
1351 CastKind Kind = CE->getCastKind();
1353 // These cases are generally not written to ignore the result of
1354 // evaluating their sub-expressions, so we clear this now.
1355 bool Ignored = TestAndClearIgnoreResultAssign();
1357 // Since almost all cast kinds apply to scalars, this switch doesn't have
1358 // a default case, so the compiler will warn on a missing case. The cases
1359 // are in the same order as in the CastKind enum.
1361 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1362 case CK_BuiltinFnToFnPtr:
1363 llvm_unreachable("builtin functions are handled elsewhere");
1365 case CK_LValueBitCast:
1366 case CK_ObjCObjectLValueCast: {
1367 Address Addr = EmitLValue(E).getAddress();
1368 Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy));
1369 LValue LV = CGF.MakeAddrLValue(Addr, DestTy);
1370 return EmitLoadOfLValue(LV, CE->getExprLoc());
1373 case CK_CPointerToObjCPointerCast:
1374 case CK_BlockPointerToObjCPointerCast:
1375 case CK_AnyPointerToBlockPointerCast:
1377 Value *Src = Visit(const_cast<Expr*>(E));
1378 llvm::Type *SrcTy = Src->getType();
1379 llvm::Type *DstTy = ConvertType(DestTy);
1380 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1381 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1382 llvm_unreachable("wrong cast for pointers in different address spaces"
1383 "(must be an address space cast)!");
1386 if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
1387 if (auto PT = DestTy->getAs<PointerType>())
1388 CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src,
1390 CodeGenFunction::CFITCK_UnrelatedCast,
1394 return Builder.CreateBitCast(Src, DstTy);
1396 case CK_AddressSpaceConversion: {
1397 Value *Src = Visit(const_cast<Expr*>(E));
1398 // Since target may map different address spaces in AST to the same address
1399 // space, an address space conversion may end up as a bitcast.
1400 return Builder.CreatePointerBitCastOrAddrSpaceCast(Src,
1401 ConvertType(DestTy));
1403 case CK_AtomicToNonAtomic:
1404 case CK_NonAtomicToAtomic:
1406 case CK_UserDefinedConversion:
1407 return Visit(const_cast<Expr*>(E));
1409 case CK_BaseToDerived: {
1410 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1411 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1413 Address Base = CGF.EmitPointerWithAlignment(E);
1415 CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl,
1416 CE->path_begin(), CE->path_end(),
1417 CGF.ShouldNullCheckClassCastValue(CE));
1419 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1420 // performed and the object is not of the derived type.
1421 if (CGF.sanitizePerformTypeCheck())
1422 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1423 Derived.getPointer(), DestTy->getPointeeType());
1425 if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
1426 CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(),
1427 Derived.getPointer(),
1429 CodeGenFunction::CFITCK_DerivedCast,
1432 return Derived.getPointer();
1434 case CK_UncheckedDerivedToBase:
1435 case CK_DerivedToBase: {
1436 // The EmitPointerWithAlignment path does this fine; just discard
1438 return CGF.EmitPointerWithAlignment(CE).getPointer();
1442 Address V = CGF.EmitPointerWithAlignment(E);
1443 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1444 return CGF.EmitDynamicCast(V, DCE);
1447 case CK_ArrayToPointerDecay:
1448 return CGF.EmitArrayToPointerDecay(E).getPointer();
1449 case CK_FunctionToPointerDecay:
1450 return EmitLValue(E).getPointer();
1452 case CK_NullToPointer:
1453 if (MustVisitNullValue(E))
1456 return llvm::ConstantPointerNull::get(
1457 cast<llvm::PointerType>(ConvertType(DestTy)));
1459 case CK_NullToMemberPointer: {
1460 if (MustVisitNullValue(E))
1463 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1464 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1467 case CK_ReinterpretMemberPointer:
1468 case CK_BaseToDerivedMemberPointer:
1469 case CK_DerivedToBaseMemberPointer: {
1470 Value *Src = Visit(E);
1472 // Note that the AST doesn't distinguish between checked and
1473 // unchecked member pointer conversions, so we always have to
1474 // implement checked conversions here. This is inefficient when
1475 // actual control flow may be required in order to perform the
1476 // check, which it is for data member pointers (but not member
1477 // function pointers on Itanium and ARM).
1478 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1481 case CK_ARCProduceObject:
1482 return CGF.EmitARCRetainScalarExpr(E);
1483 case CK_ARCConsumeObject:
1484 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1485 case CK_ARCReclaimReturnedObject:
1486 return CGF.EmitARCReclaimReturnedObject(E, /*allowUnsafe*/ Ignored);
1487 case CK_ARCExtendBlockObject:
1488 return CGF.EmitARCExtendBlockObject(E);
1490 case CK_CopyAndAutoreleaseBlockObject:
1491 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1493 case CK_FloatingRealToComplex:
1494 case CK_FloatingComplexCast:
1495 case CK_IntegralRealToComplex:
1496 case CK_IntegralComplexCast:
1497 case CK_IntegralComplexToFloatingComplex:
1498 case CK_FloatingComplexToIntegralComplex:
1499 case CK_ConstructorConversion:
1501 llvm_unreachable("scalar cast to non-scalar value");
1503 case CK_LValueToRValue:
1504 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1505 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1506 return Visit(const_cast<Expr*>(E));
1508 case CK_IntegralToPointer: {
1509 Value *Src = Visit(const_cast<Expr*>(E));
1511 // First, convert to the correct width so that we control the kind of
1513 llvm::Type *MiddleTy = CGF.IntPtrTy;
1514 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1515 llvm::Value* IntResult =
1516 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1518 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
1520 case CK_PointerToIntegral:
1521 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1522 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1525 CGF.EmitIgnoredExpr(E);
1528 case CK_VectorSplat: {
1529 llvm::Type *DstTy = ConvertType(DestTy);
1530 Value *Elt = Visit(const_cast<Expr*>(E));
1531 // Splat the element across to all elements
1532 unsigned NumElements = DstTy->getVectorNumElements();
1533 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1536 case CK_IntegralCast:
1537 case CK_IntegralToFloating:
1538 case CK_FloatingToIntegral:
1539 case CK_FloatingCast:
1540 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1542 case CK_BooleanToSignedIntegral:
1543 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1545 /*TreatBooleanAsSigned=*/true);
1546 case CK_IntegralToBoolean:
1547 return EmitIntToBoolConversion(Visit(E));
1548 case CK_PointerToBoolean:
1549 return EmitPointerToBoolConversion(Visit(E));
1550 case CK_FloatingToBoolean:
1551 return EmitFloatToBoolConversion(Visit(E));
1552 case CK_MemberPointerToBoolean: {
1553 llvm::Value *MemPtr = Visit(E);
1554 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1555 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1558 case CK_FloatingComplexToReal:
1559 case CK_IntegralComplexToReal:
1560 return CGF.EmitComplexExpr(E, false, true).first;
1562 case CK_FloatingComplexToBoolean:
1563 case CK_IntegralComplexToBoolean: {
1564 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1566 // TODO: kill this function off, inline appropriate case here
1567 return EmitComplexToScalarConversion(V, E->getType(), DestTy,
1571 case CK_ZeroToOCLEvent: {
1572 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1573 return llvm::Constant::getNullValue(ConvertType(DestTy));
1578 llvm_unreachable("unknown scalar cast");
1581 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1582 CodeGenFunction::StmtExprEvaluation eval(CGF);
1583 Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1584 !E->getType()->isVoidType());
1585 if (!RetAlloca.isValid())
1587 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1591 //===----------------------------------------------------------------------===//
1593 //===----------------------------------------------------------------------===//
1595 static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
1596 llvm::Value *InVal, bool IsInc) {
1599 BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
1600 BinOp.Ty = E->getType();
1601 BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
1602 BinOp.FPContractable = false;
1607 llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
1608 const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
1609 llvm::Value *Amount =
1610 llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true);
1611 StringRef Name = IsInc ? "inc" : "dec";
1612 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1613 case LangOptions::SOB_Defined:
1614 return Builder.CreateAdd(InVal, Amount, Name);
1615 case LangOptions::SOB_Undefined:
1616 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
1617 return Builder.CreateNSWAdd(InVal, Amount, Name);
1619 case LangOptions::SOB_Trapping:
1620 return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc));
1622 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1626 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1627 bool isInc, bool isPre) {
1629 QualType type = E->getSubExpr()->getType();
1630 llvm::PHINode *atomicPHI = nullptr;
1634 int amount = (isInc ? 1 : -1);
1636 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1637 type = atomicTy->getValueType();
1638 if (isInc && type->isBooleanType()) {
1639 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1641 Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified())
1642 ->setAtomic(llvm::AtomicOrdering::SequentiallyConsistent);
1643 return Builder.getTrue();
1645 // For atomic bool increment, we just store true and return it for
1646 // preincrement, do an atomic swap with true for postincrement
1647 return Builder.CreateAtomicRMW(
1648 llvm::AtomicRMWInst::Xchg, LV.getPointer(), True,
1649 llvm::AtomicOrdering::SequentiallyConsistent);
1651 // Special case for atomic increment / decrement on integers, emit
1652 // atomicrmw instructions. We skip this if we want to be doing overflow
1653 // checking, and fall into the slow path with the atomic cmpxchg loop.
1654 if (!type->isBooleanType() && type->isIntegerType() &&
1655 !(type->isUnsignedIntegerType() &&
1656 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
1657 CGF.getLangOpts().getSignedOverflowBehavior() !=
1658 LangOptions::SOB_Trapping) {
1659 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1660 llvm::AtomicRMWInst::Sub;
1661 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1662 llvm::Instruction::Sub;
1663 llvm::Value *amt = CGF.EmitToMemory(
1664 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1665 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1666 LV.getPointer(), amt, llvm::AtomicOrdering::SequentiallyConsistent);
1667 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1669 value = EmitLoadOfLValue(LV, E->getExprLoc());
1671 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1672 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1673 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1674 value = CGF.EmitToMemory(value, type);
1675 Builder.CreateBr(opBB);
1676 Builder.SetInsertPoint(opBB);
1677 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1678 atomicPHI->addIncoming(value, startBB);
1681 value = EmitLoadOfLValue(LV, E->getExprLoc());
1685 // Special case of integer increment that we have to check first: bool++.
1686 // Due to promotion rules, we get:
1687 // bool++ -> bool = bool + 1
1688 // -> bool = (int)bool + 1
1689 // -> bool = ((int)bool + 1 != 0)
1690 // An interesting aspect of this is that increment is always true.
1691 // Decrement does not have this property.
1692 if (isInc && type->isBooleanType()) {
1693 value = Builder.getTrue();
1695 // Most common case by far: integer increment.
1696 } else if (type->isIntegerType()) {
1697 // Note that signed integer inc/dec with width less than int can't
1698 // overflow because of promotion rules; we're just eliding a few steps here.
1699 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1700 CGF.IntTy->getIntegerBitWidth();
1701 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1702 value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
1703 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1704 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
1706 EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc));
1708 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1709 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1712 // Next most common: pointer increment.
1713 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1714 QualType type = ptr->getPointeeType();
1716 // VLA types don't have constant size.
1717 if (const VariableArrayType *vla
1718 = CGF.getContext().getAsVariableArrayType(type)) {
1719 llvm::Value *numElts = CGF.getVLASize(vla).first;
1720 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1721 if (CGF.getLangOpts().isSignedOverflowDefined())
1722 value = Builder.CreateGEP(value, numElts, "vla.inc");
1724 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1726 // Arithmetic on function pointers (!) is just +-1.
1727 } else if (type->isFunctionType()) {
1728 llvm::Value *amt = Builder.getInt32(amount);
1730 value = CGF.EmitCastToVoidPtr(value);
1731 if (CGF.getLangOpts().isSignedOverflowDefined())
1732 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1734 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1735 value = Builder.CreateBitCast(value, input->getType());
1737 // For everything else, we can just do a simple increment.
1739 llvm::Value *amt = Builder.getInt32(amount);
1740 if (CGF.getLangOpts().isSignedOverflowDefined())
1741 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1743 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1746 // Vector increment/decrement.
1747 } else if (type->isVectorType()) {
1748 if (type->hasIntegerRepresentation()) {
1749 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1751 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1753 value = Builder.CreateFAdd(
1755 llvm::ConstantFP::get(value->getType(), amount),
1756 isInc ? "inc" : "dec");
1760 } else if (type->isRealFloatingType()) {
1761 // Add the inc/dec to the real part.
1764 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1765 // Another special case: half FP increment should be done via float
1766 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1767 value = Builder.CreateCall(
1768 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1770 input, "incdec.conv");
1772 value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv");
1776 if (value->getType()->isFloatTy())
1777 amt = llvm::ConstantFP::get(VMContext,
1778 llvm::APFloat(static_cast<float>(amount)));
1779 else if (value->getType()->isDoubleTy())
1780 amt = llvm::ConstantFP::get(VMContext,
1781 llvm::APFloat(static_cast<double>(amount)));
1783 // Remaining types are Half, LongDouble or __float128. Convert from float.
1784 llvm::APFloat F(static_cast<float>(amount));
1786 const llvm::fltSemantics *FS;
1787 // Don't use getFloatTypeSemantics because Half isn't
1788 // necessarily represented using the "half" LLVM type.
1789 if (value->getType()->isFP128Ty())
1790 FS = &CGF.getTarget().getFloat128Format();
1791 else if (value->getType()->isHalfTy())
1792 FS = &CGF.getTarget().getHalfFormat();
1794 FS = &CGF.getTarget().getLongDoubleFormat();
1795 F.convert(*FS, llvm::APFloat::rmTowardZero, &ignored);
1796 amt = llvm::ConstantFP::get(VMContext, F);
1798 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1800 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1801 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1802 value = Builder.CreateCall(
1803 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
1805 value, "incdec.conv");
1807 value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv");
1811 // Objective-C pointer types.
1813 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1814 value = CGF.EmitCastToVoidPtr(value);
1816 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1817 if (!isInc) size = -size;
1818 llvm::Value *sizeValue =
1819 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1821 if (CGF.getLangOpts().isSignedOverflowDefined())
1822 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1824 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
1825 value = Builder.CreateBitCast(value, input->getType());
1829 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1830 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1831 auto Pair = CGF.EmitAtomicCompareExchange(
1832 LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
1833 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
1834 llvm::Value *success = Pair.second;
1835 atomicPHI->addIncoming(old, opBB);
1836 Builder.CreateCondBr(success, contBB, opBB);
1837 Builder.SetInsertPoint(contBB);
1838 return isPre ? value : input;
1841 // Store the updated result through the lvalue.
1842 if (LV.isBitField())
1843 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
1845 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
1847 // If this is a postinc, return the value read from memory, otherwise use the
1849 return isPre ? value : input;
1854 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
1855 TestAndClearIgnoreResultAssign();
1856 // Emit unary minus with EmitSub so we handle overflow cases etc.
1858 BinOp.RHS = Visit(E->getSubExpr());
1860 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1861 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1863 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
1864 BinOp.Ty = E->getType();
1865 BinOp.Opcode = BO_Sub;
1866 BinOp.FPContractable = false;
1868 return EmitSub(BinOp);
1871 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
1872 TestAndClearIgnoreResultAssign();
1873 Value *Op = Visit(E->getSubExpr());
1874 return Builder.CreateNot(Op, "neg");
1877 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1878 // Perform vector logical not on comparison with zero vector.
1879 if (E->getType()->isExtVectorType()) {
1880 Value *Oper = Visit(E->getSubExpr());
1881 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1883 if (Oper->getType()->isFPOrFPVectorTy())
1884 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1886 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1887 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1890 // Compare operand to zero.
1891 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
1894 // TODO: Could dynamically modify easy computations here. For example, if
1895 // the operand is an icmp ne, turn into icmp eq.
1896 BoolVal = Builder.CreateNot(BoolVal, "lnot");
1898 // ZExt result to the expr type.
1899 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
1902 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1903 // Try folding the offsetof to a constant.
1905 if (E->EvaluateAsInt(Value, CGF.getContext()))
1906 return Builder.getInt(Value);
1908 // Loop over the components of the offsetof to compute the value.
1909 unsigned n = E->getNumComponents();
1910 llvm::Type* ResultType = ConvertType(E->getType());
1911 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1912 QualType CurrentType = E->getTypeSourceInfo()->getType();
1913 for (unsigned i = 0; i != n; ++i) {
1914 OffsetOfNode ON = E->getComponent(i);
1915 llvm::Value *Offset = nullptr;
1916 switch (ON.getKind()) {
1917 case OffsetOfNode::Array: {
1918 // Compute the index
1919 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1920 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1921 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
1922 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1924 // Save the element type
1926 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1928 // Compute the element size
1929 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1930 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1932 // Multiply out to compute the result
1933 Offset = Builder.CreateMul(Idx, ElemSize);
1937 case OffsetOfNode::Field: {
1938 FieldDecl *MemberDecl = ON.getField();
1939 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1940 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1942 // Compute the index of the field in its parent.
1944 // FIXME: It would be nice if we didn't have to loop here!
1945 for (RecordDecl::field_iterator Field = RD->field_begin(),
1946 FieldEnd = RD->field_end();
1947 Field != FieldEnd; ++Field, ++i) {
1948 if (*Field == MemberDecl)
1951 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1953 // Compute the offset to the field
1954 int64_t OffsetInt = RL.getFieldOffset(i) /
1955 CGF.getContext().getCharWidth();
1956 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1958 // Save the element type.
1959 CurrentType = MemberDecl->getType();
1963 case OffsetOfNode::Identifier:
1964 llvm_unreachable("dependent __builtin_offsetof");
1966 case OffsetOfNode::Base: {
1967 if (ON.getBase()->isVirtual()) {
1968 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1972 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1973 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1975 // Save the element type.
1976 CurrentType = ON.getBase()->getType();
1978 // Compute the offset to the base.
1979 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1980 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
1981 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
1982 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
1986 Result = Builder.CreateAdd(Result, Offset);
1991 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
1992 /// argument of the sizeof expression as an integer.
1994 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
1995 const UnaryExprOrTypeTraitExpr *E) {
1996 QualType TypeToSize = E->getTypeOfArgument();
1997 if (E->getKind() == UETT_SizeOf) {
1998 if (const VariableArrayType *VAT =
1999 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
2000 if (E->isArgumentType()) {
2001 // sizeof(type) - make sure to emit the VLA size.
2002 CGF.EmitVariablyModifiedType(TypeToSize);
2004 // C99 6.5.3.4p2: If the argument is an expression of type
2005 // VLA, it is evaluated.
2006 CGF.EmitIgnoredExpr(E->getArgumentExpr());
2010 llvm::Value *numElts;
2011 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
2013 llvm::Value *size = numElts;
2015 // Scale the number of non-VLA elements by the non-VLA element size.
2016 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
2017 if (!eltSize.isOne())
2018 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
2022 } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) {
2025 .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign(
2026 E->getTypeOfArgument()->getPointeeType()))
2028 return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
2031 // If this isn't sizeof(vla), the result must be constant; use the constant
2032 // folding logic so we don't have to duplicate it here.
2033 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
2036 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
2037 Expr *Op = E->getSubExpr();
2038 if (Op->getType()->isAnyComplexType()) {
2039 // If it's an l-value, load through the appropriate subobject l-value.
2040 // Note that we have to ask E because Op might be an l-value that
2041 // this won't work for, e.g. an Obj-C property.
2043 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2044 E->getExprLoc()).getScalarVal();
2046 // Otherwise, calculate and project.
2047 return CGF.EmitComplexExpr(Op, false, true).first;
2053 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
2054 Expr *Op = E->getSubExpr();
2055 if (Op->getType()->isAnyComplexType()) {
2056 // If it's an l-value, load through the appropriate subobject l-value.
2057 // Note that we have to ask E because Op might be an l-value that
2058 // this won't work for, e.g. an Obj-C property.
2059 if (Op->isGLValue())
2060 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2061 E->getExprLoc()).getScalarVal();
2063 // Otherwise, calculate and project.
2064 return CGF.EmitComplexExpr(Op, true, false).second;
2067 // __imag on a scalar returns zero. Emit the subexpr to ensure side
2068 // effects are evaluated, but not the actual value.
2069 if (Op->isGLValue())
2072 CGF.EmitScalarExpr(Op, true);
2073 return llvm::Constant::getNullValue(ConvertType(E->getType()));
2076 //===----------------------------------------------------------------------===//
2078 //===----------------------------------------------------------------------===//
2080 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
2081 TestAndClearIgnoreResultAssign();
2083 Result.LHS = Visit(E->getLHS());
2084 Result.RHS = Visit(E->getRHS());
2085 Result.Ty = E->getType();
2086 Result.Opcode = E->getOpcode();
2087 Result.FPContractable = E->isFPContractable();
2092 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
2093 const CompoundAssignOperator *E,
2094 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2096 QualType LHSTy = E->getLHS()->getType();
2099 if (E->getComputationResultType()->isAnyComplexType())
2100 return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
2102 // Emit the RHS first. __block variables need to have the rhs evaluated
2103 // first, plus this should improve codegen a little.
2104 OpInfo.RHS = Visit(E->getRHS());
2105 OpInfo.Ty = E->getComputationResultType();
2106 OpInfo.Opcode = E->getOpcode();
2107 OpInfo.FPContractable = E->isFPContractable();
2109 // Load/convert the LHS.
2110 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2112 llvm::PHINode *atomicPHI = nullptr;
2113 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2114 QualType type = atomicTy->getValueType();
2115 if (!type->isBooleanType() && type->isIntegerType() &&
2116 !(type->isUnsignedIntegerType() &&
2117 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
2118 CGF.getLangOpts().getSignedOverflowBehavior() !=
2119 LangOptions::SOB_Trapping) {
2120 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2121 switch (OpInfo.Opcode) {
2122 // We don't have atomicrmw operands for *, %, /, <<, >>
2123 case BO_MulAssign: case BO_DivAssign:
2129 aop = llvm::AtomicRMWInst::Add;
2132 aop = llvm::AtomicRMWInst::Sub;
2135 aop = llvm::AtomicRMWInst::And;
2138 aop = llvm::AtomicRMWInst::Xor;
2141 aop = llvm::AtomicRMWInst::Or;
2144 llvm_unreachable("Invalid compound assignment type");
2146 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2147 llvm::Value *amt = CGF.EmitToMemory(
2148 EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy,
2151 Builder.CreateAtomicRMW(aop, LHSLV.getPointer(), amt,
2152 llvm::AtomicOrdering::SequentiallyConsistent);
2156 // FIXME: For floating point types, we should be saving and restoring the
2157 // floating point environment in the loop.
2158 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2159 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2160 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2161 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2162 Builder.CreateBr(opBB);
2163 Builder.SetInsertPoint(opBB);
2164 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2165 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2166 OpInfo.LHS = atomicPHI;
2169 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2171 SourceLocation Loc = E->getExprLoc();
2173 EmitScalarConversion(OpInfo.LHS, LHSTy, E->getComputationLHSType(), Loc);
2175 // Expand the binary operator.
2176 Result = (this->*Func)(OpInfo);
2178 // Convert the result back to the LHS type.
2180 EmitScalarConversion(Result, E->getComputationResultType(), LHSTy, Loc);
2183 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2184 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2185 auto Pair = CGF.EmitAtomicCompareExchange(
2186 LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
2187 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
2188 llvm::Value *success = Pair.second;
2189 atomicPHI->addIncoming(old, opBB);
2190 Builder.CreateCondBr(success, contBB, opBB);
2191 Builder.SetInsertPoint(contBB);
2195 // Store the result value into the LHS lvalue. Bit-fields are handled
2196 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2197 // 'An assignment expression has the value of the left operand after the
2199 if (LHSLV.isBitField())
2200 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2202 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2207 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2208 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2209 bool Ignore = TestAndClearIgnoreResultAssign();
2211 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2213 // If the result is clearly ignored, return now.
2217 // The result of an assignment in C is the assigned r-value.
2218 if (!CGF.getLangOpts().CPlusPlus)
2221 // If the lvalue is non-volatile, return the computed value of the assignment.
2222 if (!LHS.isVolatileQualified())
2225 // Otherwise, reload the value.
2226 return EmitLoadOfLValue(LHS, E->getExprLoc());
2229 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2230 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2231 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks;
2233 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2234 Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
2235 SanitizerKind::IntegerDivideByZero));
2238 if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
2239 Ops.Ty->hasSignedIntegerRepresentation()) {
2240 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2242 llvm::Value *IntMin =
2243 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2244 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2246 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2247 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2248 llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2250 std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow));
2253 if (Checks.size() > 0)
2254 EmitBinOpCheck(Checks, Ops);
2257 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2259 CodeGenFunction::SanitizerScope SanScope(&CGF);
2260 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2261 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2262 Ops.Ty->isIntegerType()) {
2263 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2264 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2265 } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
2266 Ops.Ty->isRealFloatingType()) {
2267 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2268 llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
2269 EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero),
2274 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2275 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2276 if (CGF.getLangOpts().OpenCL) {
2277 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
2278 llvm::Type *ValTy = Val->getType();
2279 if (ValTy->isFloatTy() ||
2280 (isa<llvm::VectorType>(ValTy) &&
2281 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2282 CGF.SetFPAccuracy(Val, 2.5);
2286 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2287 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2289 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2292 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2293 // Rem in C can't be a floating point type: C99 6.5.5p2.
2294 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2295 CodeGenFunction::SanitizerScope SanScope(&CGF);
2296 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2298 if (Ops.Ty->isIntegerType())
2299 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2302 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2303 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2305 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2308 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2312 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2313 switch (Ops.Opcode) {
2317 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2318 llvm::Intrinsic::uadd_with_overflow;
2323 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2324 llvm::Intrinsic::usub_with_overflow;
2329 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2330 llvm::Intrinsic::umul_with_overflow;
2333 llvm_unreachable("Unsupported operation for overflow detection");
2339 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2341 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2343 Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
2344 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2345 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2347 // Handle overflow with llvm.trap if no custom handler has been specified.
2348 const std::string *handlerName =
2349 &CGF.getLangOpts().OverflowHandler;
2350 if (handlerName->empty()) {
2351 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2352 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2353 if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
2354 CodeGenFunction::SanitizerScope SanScope(&CGF);
2355 llvm::Value *NotOverflow = Builder.CreateNot(overflow);
2356 SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow
2357 : SanitizerKind::UnsignedIntegerOverflow;
2358 EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops);
2360 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2364 // Branch in case of overflow.
2365 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2366 llvm::Function::iterator insertPt = initialBB->getIterator();
2367 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2368 &*std::next(insertPt));
2369 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2371 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2373 // If an overflow handler is set, then we want to call it and then use its
2374 // result, if it returns.
2375 Builder.SetInsertPoint(overflowBB);
2377 // Get the overflow handler.
2378 llvm::Type *Int8Ty = CGF.Int8Ty;
2379 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2380 llvm::FunctionType *handlerTy =
2381 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2382 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2384 // Sign extend the args to 64-bit, so that we can use the same handler for
2385 // all types of overflow.
2386 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2387 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2389 // Call the handler with the two arguments, the operation, and the size of
2391 llvm::Value *handlerArgs[] = {
2394 Builder.getInt8(OpID),
2395 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2397 llvm::Value *handlerResult =
2398 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2400 // Truncate the result back to the desired size.
2401 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2402 Builder.CreateBr(continueBB);
2404 Builder.SetInsertPoint(continueBB);
2405 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2406 phi->addIncoming(result, initialBB);
2407 phi->addIncoming(handlerResult, overflowBB);
2412 /// Emit pointer + index arithmetic.
2413 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2414 const BinOpInfo &op,
2415 bool isSubtraction) {
2416 // Must have binary (not unary) expr here. Unary pointer
2417 // increment/decrement doesn't use this path.
2418 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2420 Value *pointer = op.LHS;
2421 Expr *pointerOperand = expr->getLHS();
2422 Value *index = op.RHS;
2423 Expr *indexOperand = expr->getRHS();
2425 // In a subtraction, the LHS is always the pointer.
2426 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2427 std::swap(pointer, index);
2428 std::swap(pointerOperand, indexOperand);
2431 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2432 if (width != CGF.PointerWidthInBits) {
2433 // Zero-extend or sign-extend the pointer value according to
2434 // whether the index is signed or not.
2435 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2436 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2440 // If this is subtraction, negate the index.
2442 index = CGF.Builder.CreateNeg(index, "idx.neg");
2444 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
2445 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2446 /*Accessed*/ false);
2448 const PointerType *pointerType
2449 = pointerOperand->getType()->getAs<PointerType>();
2451 QualType objectType = pointerOperand->getType()
2452 ->castAs<ObjCObjectPointerType>()
2454 llvm::Value *objectSize
2455 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2457 index = CGF.Builder.CreateMul(index, objectSize);
2459 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2460 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2461 return CGF.Builder.CreateBitCast(result, pointer->getType());
2464 QualType elementType = pointerType->getPointeeType();
2465 if (const VariableArrayType *vla
2466 = CGF.getContext().getAsVariableArrayType(elementType)) {
2467 // The element count here is the total number of non-VLA elements.
2468 llvm::Value *numElements = CGF.getVLASize(vla).first;
2470 // Effectively, the multiply by the VLA size is part of the GEP.
2471 // GEP indexes are signed, and scaling an index isn't permitted to
2472 // signed-overflow, so we use the same semantics for our explicit
2473 // multiply. We suppress this if overflow is not undefined behavior.
2474 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2475 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2476 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2478 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2479 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2484 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2485 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2487 if (elementType->isVoidType() || elementType->isFunctionType()) {
2488 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2489 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2490 return CGF.Builder.CreateBitCast(result, pointer->getType());
2493 if (CGF.getLangOpts().isSignedOverflowDefined())
2494 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2496 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2499 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2500 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2501 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2502 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2503 // efficient operations.
2504 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2505 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2506 bool negMul, bool negAdd) {
2507 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2509 Value *MulOp0 = MulOp->getOperand(0);
2510 Value *MulOp1 = MulOp->getOperand(1);
2514 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2516 } else if (negAdd) {
2519 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2523 Value *FMulAdd = Builder.CreateCall(
2524 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2525 {MulOp0, MulOp1, Addend});
2526 MulOp->eraseFromParent();
2531 // Check whether it would be legal to emit an fmuladd intrinsic call to
2532 // represent op and if so, build the fmuladd.
2534 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2535 // Does NOT check the type of the operation - it's assumed that this function
2536 // will be called from contexts where it's known that the type is contractable.
2537 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2538 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2541 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2542 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2543 "Only fadd/fsub can be the root of an fmuladd.");
2545 // Check whether this op is marked as fusable.
2546 if (!op.FPContractable)
2549 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2550 // either disabled, or handled entirely by the LLVM backend).
2551 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
2554 // We have a potentially fusable op. Look for a mul on one of the operands.
2555 // Also, make sure that the mul result isn't used directly. In that case,
2556 // there's no point creating a muladd operation.
2557 if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2558 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2559 LHSBinOp->use_empty())
2560 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2562 if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2563 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2564 RHSBinOp->use_empty())
2565 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2571 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2572 if (op.LHS->getType()->isPointerTy() ||
2573 op.RHS->getType()->isPointerTy())
2574 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2576 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2577 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2578 case LangOptions::SOB_Defined:
2579 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2580 case LangOptions::SOB_Undefined:
2581 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2582 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2584 case LangOptions::SOB_Trapping:
2585 return EmitOverflowCheckedBinOp(op);
2589 if (op.Ty->isUnsignedIntegerType() &&
2590 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2591 return EmitOverflowCheckedBinOp(op);
2593 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2594 // Try to form an fmuladd.
2595 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2598 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
2601 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2604 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2605 // The LHS is always a pointer if either side is.
2606 if (!op.LHS->getType()->isPointerTy()) {
2607 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2608 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2609 case LangOptions::SOB_Defined:
2610 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2611 case LangOptions::SOB_Undefined:
2612 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2613 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2615 case LangOptions::SOB_Trapping:
2616 return EmitOverflowCheckedBinOp(op);
2620 if (op.Ty->isUnsignedIntegerType() &&
2621 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2622 return EmitOverflowCheckedBinOp(op);
2624 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2625 // Try to form an fmuladd.
2626 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2628 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
2631 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2634 // If the RHS is not a pointer, then we have normal pointer
2636 if (!op.RHS->getType()->isPointerTy())
2637 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2639 // Otherwise, this is a pointer subtraction.
2641 // Do the raw subtraction part.
2643 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2645 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2646 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2648 // Okay, figure out the element size.
2649 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2650 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2652 llvm::Value *divisor = nullptr;
2654 // For a variable-length array, this is going to be non-constant.
2655 if (const VariableArrayType *vla
2656 = CGF.getContext().getAsVariableArrayType(elementType)) {
2657 llvm::Value *numElements;
2658 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2660 divisor = numElements;
2662 // Scale the number of non-VLA elements by the non-VLA element size.
2663 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2664 if (!eltSize.isOne())
2665 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2667 // For everything elese, we can just compute it, safe in the
2668 // assumption that Sema won't let anything through that we can't
2669 // safely compute the size of.
2671 CharUnits elementSize;
2672 // Handle GCC extension for pointer arithmetic on void* and
2673 // function pointer types.
2674 if (elementType->isVoidType() || elementType->isFunctionType())
2675 elementSize = CharUnits::One();
2677 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2679 // Don't even emit the divide for element size of 1.
2680 if (elementSize.isOne())
2683 divisor = CGF.CGM.getSize(elementSize);
2686 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2687 // pointer difference in C is only defined in the case where both operands
2688 // are pointing to elements of an array.
2689 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2692 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2693 llvm::IntegerType *Ty;
2694 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2695 Ty = cast<llvm::IntegerType>(VT->getElementType());
2697 Ty = cast<llvm::IntegerType>(LHS->getType());
2698 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2701 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2702 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2703 // RHS to the same size as the LHS.
2704 Value *RHS = Ops.RHS;
2705 if (Ops.LHS->getType() != RHS->getType())
2706 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2708 bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
2709 Ops.Ty->hasSignedIntegerRepresentation() &&
2710 !CGF.getLangOpts().isSignedOverflowDefined();
2711 bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
2712 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2713 if (CGF.getLangOpts().OpenCL)
2715 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2716 else if ((SanitizeBase || SanitizeExponent) &&
2717 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2718 CodeGenFunction::SanitizerScope SanScope(&CGF);
2719 SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks;
2720 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
2721 llvm::Value *ValidExponent = Builder.CreateICmpULE(RHS, WidthMinusOne);
2723 if (SanitizeExponent) {
2725 std::make_pair(ValidExponent, SanitizerKind::ShiftExponent));
2729 // Check whether we are shifting any non-zero bits off the top of the
2730 // integer. We only emit this check if exponent is valid - otherwise
2731 // instructions below will have undefined behavior themselves.
2732 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2733 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2734 llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
2735 Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
2736 CGF.EmitBlock(CheckShiftBase);
2737 llvm::Value *BitsShiftedOff =
2738 Builder.CreateLShr(Ops.LHS,
2739 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2740 /*NUW*/true, /*NSW*/true),
2742 if (CGF.getLangOpts().CPlusPlus) {
2743 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2744 // Under C++11's rules, shifting a 1 bit into the sign bit is
2745 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2746 // define signed left shifts, so we use the C99 and C++11 rules there).
2747 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2748 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2750 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2751 llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2752 CGF.EmitBlock(Cont);
2753 llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
2754 BaseCheck->addIncoming(Builder.getTrue(), Orig);
2755 BaseCheck->addIncoming(ValidBase, CheckShiftBase);
2756 Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase));
2759 assert(!Checks.empty());
2760 EmitBinOpCheck(Checks, Ops);
2763 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2766 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2767 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2768 // RHS to the same size as the LHS.
2769 Value *RHS = Ops.RHS;
2770 if (Ops.LHS->getType() != RHS->getType())
2771 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2773 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2774 if (CGF.getLangOpts().OpenCL)
2776 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2777 else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
2778 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2779 CodeGenFunction::SanitizerScope SanScope(&CGF);
2780 llvm::Value *Valid =
2781 Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS));
2782 EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops);
2785 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2786 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2787 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2790 enum IntrinsicType { VCMPEQ, VCMPGT };
2791 // return corresponding comparison intrinsic for given vector type
2792 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2793 BuiltinType::Kind ElemKind) {
2795 default: llvm_unreachable("unexpected element type");
2796 case BuiltinType::Char_U:
2797 case BuiltinType::UChar:
2798 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2799 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
2800 case BuiltinType::Char_S:
2801 case BuiltinType::SChar:
2802 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2803 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
2804 case BuiltinType::UShort:
2805 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2806 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
2807 case BuiltinType::Short:
2808 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2809 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
2810 case BuiltinType::UInt:
2811 case BuiltinType::ULong:
2812 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2813 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
2814 case BuiltinType::Int:
2815 case BuiltinType::Long:
2816 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2817 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
2818 case BuiltinType::Float:
2819 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2820 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
2824 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,
2825 llvm::CmpInst::Predicate UICmpOpc,
2826 llvm::CmpInst::Predicate SICmpOpc,
2827 llvm::CmpInst::Predicate FCmpOpc) {
2828 TestAndClearIgnoreResultAssign();
2830 QualType LHSTy = E->getLHS()->getType();
2831 QualType RHSTy = E->getRHS()->getType();
2832 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
2833 assert(E->getOpcode() == BO_EQ ||
2834 E->getOpcode() == BO_NE);
2835 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2836 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
2837 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
2838 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
2839 } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
2840 Value *LHS = Visit(E->getLHS());
2841 Value *RHS = Visit(E->getRHS());
2843 // If AltiVec, the comparison results in a numeric type, so we use
2844 // intrinsics comparing vectors and giving 0 or 1 as a result
2845 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
2846 // constants for mapping CR6 register bits to predicate result
2847 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2849 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2851 // in several cases vector arguments order will be reversed
2852 Value *FirstVecArg = LHS,
2853 *SecondVecArg = RHS;
2855 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
2856 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
2857 BuiltinType::Kind ElementKind = BTy->getKind();
2859 switch(E->getOpcode()) {
2860 default: llvm_unreachable("is not a comparison operation");
2863 ID = GetIntrinsic(VCMPEQ, ElementKind);
2867 ID = GetIntrinsic(VCMPEQ, ElementKind);
2871 ID = GetIntrinsic(VCMPGT, ElementKind);
2872 std::swap(FirstVecArg, SecondVecArg);
2876 ID = GetIntrinsic(VCMPGT, ElementKind);
2879 if (ElementKind == BuiltinType::Float) {
2881 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2882 std::swap(FirstVecArg, SecondVecArg);
2886 ID = GetIntrinsic(VCMPGT, ElementKind);
2890 if (ElementKind == BuiltinType::Float) {
2892 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2896 ID = GetIntrinsic(VCMPGT, ElementKind);
2897 std::swap(FirstVecArg, SecondVecArg);
2902 Value *CR6Param = Builder.getInt32(CR6);
2903 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2904 Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
2905 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
2909 if (LHS->getType()->isFPOrFPVectorTy()) {
2910 Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp");
2911 } else if (LHSTy->hasSignedIntegerRepresentation()) {
2912 Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp");
2914 // Unsigned integers and pointers.
2915 Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp");
2918 // If this is a vector comparison, sign extend the result to the appropriate
2919 // vector integer type and return it (don't convert to bool).
2920 if (LHSTy->isVectorType())
2921 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2924 // Complex Comparison: can only be an equality comparison.
2925 CodeGenFunction::ComplexPairTy LHS, RHS;
2927 if (auto *CTy = LHSTy->getAs<ComplexType>()) {
2928 LHS = CGF.EmitComplexExpr(E->getLHS());
2929 CETy = CTy->getElementType();
2931 LHS.first = Visit(E->getLHS());
2932 LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
2935 if (auto *CTy = RHSTy->getAs<ComplexType>()) {
2936 RHS = CGF.EmitComplexExpr(E->getRHS());
2937 assert(CGF.getContext().hasSameUnqualifiedType(CETy,
2938 CTy->getElementType()) &&
2939 "The element types must always match.");
2942 RHS.first = Visit(E->getRHS());
2943 RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
2944 assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
2945 "The element types must always match.");
2948 Value *ResultR, *ResultI;
2949 if (CETy->isRealFloatingType()) {
2950 ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r");
2951 ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i");
2953 // Complex comparisons can only be equality comparisons. As such, signed
2954 // and unsigned opcodes are the same.
2955 ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r");
2956 ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i");
2959 if (E->getOpcode() == BO_EQ) {
2960 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2962 assert(E->getOpcode() == BO_NE &&
2963 "Complex comparison other than == or != ?");
2964 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2968 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
2972 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
2973 bool Ignore = TestAndClearIgnoreResultAssign();
2978 switch (E->getLHS()->getType().getObjCLifetime()) {
2979 case Qualifiers::OCL_Strong:
2980 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
2983 case Qualifiers::OCL_Autoreleasing:
2984 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
2987 case Qualifiers::OCL_ExplicitNone:
2988 std::tie(LHS, RHS) = CGF.EmitARCStoreUnsafeUnretained(E, Ignore);
2991 case Qualifiers::OCL_Weak:
2992 RHS = Visit(E->getRHS());
2993 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2994 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
2997 case Qualifiers::OCL_None:
2998 // __block variables need to have the rhs evaluated first, plus
2999 // this should improve codegen just a little.
3000 RHS = Visit(E->getRHS());
3001 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3003 // Store the value into the LHS. Bit-fields are handled specially
3004 // because the result is altered by the store, i.e., [C99 6.5.16p1]
3005 // 'An assignment expression has the value of the left operand after
3006 // the assignment...'.
3007 if (LHS.isBitField())
3008 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
3010 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
3013 // If the result is clearly ignored, return now.
3017 // The result of an assignment in C is the assigned r-value.
3018 if (!CGF.getLangOpts().CPlusPlus)
3021 // If the lvalue is non-volatile, return the computed value of the assignment.
3022 if (!LHS.isVolatileQualified())
3025 // Otherwise, reload the value.
3026 return EmitLoadOfLValue(LHS, E->getExprLoc());
3029 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
3030 // Perform vector logical and on comparisons with zero vectors.
3031 if (E->getType()->isVectorType()) {
3032 CGF.incrementProfileCounter(E);
3034 Value *LHS = Visit(E->getLHS());
3035 Value *RHS = Visit(E->getRHS());
3036 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3037 if (LHS->getType()->isFPOrFPVectorTy()) {
3038 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3039 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3041 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3042 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3044 Value *And = Builder.CreateAnd(LHS, RHS);
3045 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
3048 llvm::Type *ResTy = ConvertType(E->getType());
3050 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
3051 // If we have 1 && X, just emit X without inserting the control flow.
3053 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3054 if (LHSCondVal) { // If we have 1 && X, just emit X.
3055 CGF.incrementProfileCounter(E);
3057 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3058 // ZExt result to int or bool.
3059 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
3062 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
3063 if (!CGF.ContainsLabel(E->getRHS()))
3064 return llvm::Constant::getNullValue(ResTy);
3067 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
3068 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
3070 CodeGenFunction::ConditionalEvaluation eval(CGF);
3072 // Branch on the LHS first. If it is false, go to the failure (cont) block.
3073 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock,
3074 CGF.getProfileCount(E->getRHS()));
3076 // Any edges into the ContBlock are now from an (indeterminate number of)
3077 // edges from this first condition. All of these values will be false. Start
3078 // setting up the PHI node in the Cont Block for this.
3079 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3081 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3083 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
3086 CGF.EmitBlock(RHSBlock);
3087 CGF.incrementProfileCounter(E);
3088 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3091 // Reaquire the RHS block, as there may be subblocks inserted.
3092 RHSBlock = Builder.GetInsertBlock();
3094 // Emit an unconditional branch from this block to ContBlock.
3096 // There is no need to emit line number for unconditional branch.
3097 auto NL = ApplyDebugLocation::CreateEmpty(CGF);
3098 CGF.EmitBlock(ContBlock);
3100 // Insert an entry into the phi node for the edge with the value of RHSCond.
3101 PN->addIncoming(RHSCond, RHSBlock);
3103 // ZExt result to int.
3104 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
3107 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
3108 // Perform vector logical or on comparisons with zero vectors.
3109 if (E->getType()->isVectorType()) {
3110 CGF.incrementProfileCounter(E);
3112 Value *LHS = Visit(E->getLHS());
3113 Value *RHS = Visit(E->getRHS());
3114 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3115 if (LHS->getType()->isFPOrFPVectorTy()) {
3116 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3117 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3119 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3120 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3122 Value *Or = Builder.CreateOr(LHS, RHS);
3123 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
3126 llvm::Type *ResTy = ConvertType(E->getType());
3128 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
3129 // If we have 0 || X, just emit X without inserting the control flow.
3131 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3132 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3133 CGF.incrementProfileCounter(E);
3135 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3136 // ZExt result to int or bool.
3137 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3140 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3141 if (!CGF.ContainsLabel(E->getRHS()))
3142 return llvm::ConstantInt::get(ResTy, 1);
3145 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3146 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3148 CodeGenFunction::ConditionalEvaluation eval(CGF);
3150 // Branch on the LHS first. If it is true, go to the success (cont) block.
3151 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3152 CGF.getCurrentProfileCount() -
3153 CGF.getProfileCount(E->getRHS()));
3155 // Any edges into the ContBlock are now from an (indeterminate number of)
3156 // edges from this first condition. All of these values will be true. Start
3157 // setting up the PHI node in the Cont Block for this.
3158 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3160 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3162 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3166 // Emit the RHS condition as a bool value.
3167 CGF.EmitBlock(RHSBlock);
3168 CGF.incrementProfileCounter(E);
3169 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3173 // Reaquire the RHS block, as there may be subblocks inserted.
3174 RHSBlock = Builder.GetInsertBlock();
3176 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3177 // into the phi node for the edge with the value of RHSCond.
3178 CGF.EmitBlock(ContBlock);
3179 PN->addIncoming(RHSCond, RHSBlock);
3181 // ZExt result to int.
3182 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3185 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3186 CGF.EmitIgnoredExpr(E->getLHS());
3187 CGF.EnsureInsertPoint();
3188 return Visit(E->getRHS());
3191 //===----------------------------------------------------------------------===//
3193 //===----------------------------------------------------------------------===//
3195 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3196 /// expression is cheap enough and side-effect-free enough to evaluate
3197 /// unconditionally instead of conditionally. This is used to convert control
3198 /// flow into selects in some cases.
3199 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3200 CodeGenFunction &CGF) {
3201 // Anything that is an integer or floating point constant is fine.
3202 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3204 // Even non-volatile automatic variables can't be evaluated unconditionally.
3205 // Referencing a thread_local may cause non-trivial initialization work to
3206 // occur. If we're inside a lambda and one of the variables is from the scope
3207 // outside the lambda, that function may have returned already. Reading its
3208 // locals is a bad idea. Also, these reads may introduce races there didn't
3209 // exist in the source-level program.
3213 Value *ScalarExprEmitter::
3214 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3215 TestAndClearIgnoreResultAssign();
3217 // Bind the common expression if necessary.
3218 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3220 Expr *condExpr = E->getCond();
3221 Expr *lhsExpr = E->getTrueExpr();
3222 Expr *rhsExpr = E->getFalseExpr();
3224 // If the condition constant folds and can be elided, try to avoid emitting
3225 // the condition and the dead arm.
3227 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3228 Expr *live = lhsExpr, *dead = rhsExpr;
3229 if (!CondExprBool) std::swap(live, dead);
3231 // If the dead side doesn't have labels we need, just emit the Live part.
3232 if (!CGF.ContainsLabel(dead)) {
3234 CGF.incrementProfileCounter(E);
3235 Value *Result = Visit(live);
3237 // If the live part is a throw expression, it acts like it has a void
3238 // type, so evaluating it returns a null Value*. However, a conditional
3239 // with non-void type must return a non-null Value*.
3240 if (!Result && !E->getType()->isVoidType())
3241 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3247 // OpenCL: If the condition is a vector, we can treat this condition like
3248 // the select function.
3249 if (CGF.getLangOpts().OpenCL
3250 && condExpr->getType()->isVectorType()) {
3251 CGF.incrementProfileCounter(E);
3253 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3254 llvm::Value *LHS = Visit(lhsExpr);
3255 llvm::Value *RHS = Visit(rhsExpr);
3257 llvm::Type *condType = ConvertType(condExpr->getType());
3258 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3260 unsigned numElem = vecTy->getNumElements();
3261 llvm::Type *elemType = vecTy->getElementType();
3263 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3264 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3265 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3266 llvm::VectorType::get(elemType,
3269 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3271 // Cast float to int to perform ANDs if necessary.
3272 llvm::Value *RHSTmp = RHS;
3273 llvm::Value *LHSTmp = LHS;
3274 bool wasCast = false;
3275 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3276 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3277 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3278 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3282 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3283 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3284 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3286 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3291 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3292 // select instead of as control flow. We can only do this if it is cheap and
3293 // safe to evaluate the LHS and RHS unconditionally.
3294 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3295 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3296 CGF.incrementProfileCounter(E);
3298 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3299 llvm::Value *LHS = Visit(lhsExpr);
3300 llvm::Value *RHS = Visit(rhsExpr);
3302 // If the conditional has void type, make sure we return a null Value*.
3303 assert(!RHS && "LHS and RHS types must match");
3306 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3309 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3310 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3311 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3313 CodeGenFunction::ConditionalEvaluation eval(CGF);
3314 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
3315 CGF.getProfileCount(lhsExpr));
3317 CGF.EmitBlock(LHSBlock);
3318 CGF.incrementProfileCounter(E);
3320 Value *LHS = Visit(lhsExpr);
3323 LHSBlock = Builder.GetInsertBlock();
3324 Builder.CreateBr(ContBlock);
3326 CGF.EmitBlock(RHSBlock);
3328 Value *RHS = Visit(rhsExpr);
3331 RHSBlock = Builder.GetInsertBlock();
3332 CGF.EmitBlock(ContBlock);
3334 // If the LHS or RHS is a throw expression, it will be legitimately null.
3340 // Create a PHI node for the real part.
3341 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3342 PN->addIncoming(LHS, LHSBlock);
3343 PN->addIncoming(RHS, RHSBlock);
3347 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3348 return Visit(E->getChosenSubExpr());
3351 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3352 QualType Ty = VE->getType();
3354 if (Ty->isVariablyModifiedType())
3355 CGF.EmitVariablyModifiedType(Ty);
3357 Address ArgValue = Address::invalid();
3358 Address ArgPtr = CGF.EmitVAArg(VE, ArgValue);
3360 llvm::Type *ArgTy = ConvertType(VE->getType());
3362 // If EmitVAArg fails, emit an error.
3363 if (!ArgPtr.isValid()) {
3364 CGF.ErrorUnsupported(VE, "va_arg expression");
3365 return llvm::UndefValue::get(ArgTy);
3368 // FIXME Volatility.
3369 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3371 // If EmitVAArg promoted the type, we must truncate it.
3372 if (ArgTy != Val->getType()) {
3373 if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy())
3374 Val = Builder.CreateIntToPtr(Val, ArgTy);
3376 Val = Builder.CreateTrunc(Val, ArgTy);
3382 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3383 return CGF.EmitBlockLiteral(block);
3386 // Convert a vec3 to vec4, or vice versa.
3387 static Value *ConvertVec3AndVec4(CGBuilderTy &Builder, CodeGenFunction &CGF,
3388 Value *Src, unsigned NumElementsDst) {
3389 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3390 SmallVector<llvm::Constant*, 4> Args;
3391 Args.push_back(Builder.getInt32(0));
3392 Args.push_back(Builder.getInt32(1));
3393 Args.push_back(Builder.getInt32(2));
3394 if (NumElementsDst == 4)
3395 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3396 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3397 return Builder.CreateShuffleVector(Src, UnV, Mask);
3400 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3401 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3402 llvm::Type *DstTy = ConvertType(E->getType());
3404 llvm::Type *SrcTy = Src->getType();
3405 unsigned NumElementsSrc = isa<llvm::VectorType>(SrcTy) ?
3406 cast<llvm::VectorType>(SrcTy)->getNumElements() : 0;
3407 unsigned NumElementsDst = isa<llvm::VectorType>(DstTy) ?
3408 cast<llvm::VectorType>(DstTy)->getNumElements() : 0;
3410 // Going from vec3 to non-vec3 is a special case and requires a shuffle
3411 // vector to get a vec4, then a bitcast if the target type is different.
3412 if (NumElementsSrc == 3 && NumElementsDst != 3) {
3413 Src = ConvertVec3AndVec4(Builder, CGF, Src, 4);
3414 Src = Builder.CreateBitCast(Src, DstTy);
3415 Src->setName("astype");
3419 // Going from non-vec3 to vec3 is a special case and requires a bitcast
3420 // to vec4 if the original type is not vec4, then a shuffle vector to
3422 if (NumElementsSrc != 3 && NumElementsDst == 3) {
3423 auto Vec4Ty = llvm::VectorType::get(DstTy->getVectorElementType(), 4);
3424 Src = Builder.CreateBitCast(Src, Vec4Ty);
3425 Src = ConvertVec3AndVec4(Builder, CGF, Src, 3);
3426 Src->setName("astype");
3430 return Builder.CreateBitCast(Src, DstTy, "astype");
3433 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3434 return CGF.EmitAtomicExpr(E).getScalarVal();
3437 //===----------------------------------------------------------------------===//
3438 // Entry Point into this File
3439 //===----------------------------------------------------------------------===//
3441 /// Emit the computation of the specified expression of scalar type, ignoring
3443 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3444 assert(E && hasScalarEvaluationKind(E->getType()) &&
3445 "Invalid scalar expression to emit");
3447 return ScalarExprEmitter(*this, IgnoreResultAssign)
3448 .Visit(const_cast<Expr *>(E));
3451 /// Emit a conversion from the specified type to the specified destination type,
3452 /// both of which are LLVM scalar types.
3453 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3455 SourceLocation Loc) {
3456 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3457 "Invalid scalar expression to emit");
3458 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc);
3461 /// Emit a conversion from the specified complex type to the specified
3462 /// destination type, where the destination type is an LLVM scalar type.
3463 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3466 SourceLocation Loc) {
3467 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3468 "Invalid complex -> scalar conversion");
3469 return ScalarExprEmitter(*this)
3470 .EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc);
3474 llvm::Value *CodeGenFunction::
3475 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3476 bool isInc, bool isPre) {
3477 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3480 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3481 // object->isa or (*object).isa
3482 // Generate code as for: *(Class*)object
3484 Expr *BaseExpr = E->getBase();
3485 Address Addr = Address::invalid();
3486 if (BaseExpr->isRValue()) {
3487 Addr = Address(EmitScalarExpr(BaseExpr), getPointerAlign());
3489 Addr = EmitLValue(BaseExpr).getAddress();
3492 // Cast the address to Class*.
3493 Addr = Builder.CreateElementBitCast(Addr, ConvertType(E->getType()));
3494 return MakeAddrLValue(Addr, E->getType());
3498 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3499 const CompoundAssignOperator *E) {
3500 ScalarExprEmitter Scalar(*this);
3501 Value *Result = nullptr;
3502 switch (E->getOpcode()) {
3503 #define COMPOUND_OP(Op) \
3504 case BO_##Op##Assign: \
3505 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3541 llvm_unreachable("Not valid compound assignment operators");
3544 llvm_unreachable("Unhandled compound assignment operator");