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 = cast<llvm::VectorType>(DstTy)->getNumElements();
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 (E->getNumSubExprs() == 3 && E->getExpr(2)->getType()->isVectorType())) {
989 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
990 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
993 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
994 unsigned LHSElts = LTy->getNumElements();
996 if (E->getNumSubExprs() == 3) {
997 Mask = CGF.EmitScalarExpr(E->getExpr(2));
999 // Shuffle LHS & RHS into one input vector.
1000 SmallVector<llvm::Constant*, 32> concat;
1001 for (unsigned i = 0; i != LHSElts; ++i) {
1002 concat.push_back(Builder.getInt32(2*i));
1003 concat.push_back(Builder.getInt32(2*i+1));
1006 Value* CV = llvm::ConstantVector::get(concat);
1007 LHS = Builder.CreateShuffleVector(LHS, RHS, CV, "concat");
1013 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
1015 // Mask off the high bits of each shuffle index.
1017 llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1);
1018 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
1021 // mask = mask & maskbits
1023 // n = extract mask i
1024 // x = extract val n
1025 // newv = insert newv, x, i
1026 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
1027 MTy->getNumElements());
1028 Value* NewV = llvm::UndefValue::get(RTy);
1029 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
1030 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
1031 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
1033 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
1034 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
1039 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
1040 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
1042 SmallVector<llvm::Constant*, 32> indices;
1043 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
1044 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
1045 // Check for -1 and output it as undef in the IR.
1046 if (Idx.isSigned() && Idx.isAllOnesValue())
1047 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
1049 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
1052 Value *SV = llvm::ConstantVector::get(indices);
1053 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
1056 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
1057 QualType SrcType = E->getSrcExpr()->getType(),
1058 DstType = E->getType();
1060 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
1062 SrcType = CGF.getContext().getCanonicalType(SrcType);
1063 DstType = CGF.getContext().getCanonicalType(DstType);
1064 if (SrcType == DstType) return Src;
1066 assert(SrcType->isVectorType() &&
1067 "ConvertVector source type must be a vector");
1068 assert(DstType->isVectorType() &&
1069 "ConvertVector destination type must be a vector");
1071 llvm::Type *SrcTy = Src->getType();
1072 llvm::Type *DstTy = ConvertType(DstType);
1074 // Ignore conversions like int -> uint.
1078 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
1079 DstEltType = DstType->getAs<VectorType>()->getElementType();
1081 assert(SrcTy->isVectorTy() &&
1082 "ConvertVector source IR type must be a vector");
1083 assert(DstTy->isVectorTy() &&
1084 "ConvertVector destination IR type must be a vector");
1086 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1087 *DstEltTy = DstTy->getVectorElementType();
1089 if (DstEltType->isBooleanType()) {
1090 assert((SrcEltTy->isFloatingPointTy() ||
1091 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1093 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1094 if (SrcEltTy->isFloatingPointTy()) {
1095 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1097 return Builder.CreateICmpNE(Src, Zero, "tobool");
1101 // We have the arithmetic types: real int/float.
1102 Value *Res = nullptr;
1104 if (isa<llvm::IntegerType>(SrcEltTy)) {
1105 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1106 if (isa<llvm::IntegerType>(DstEltTy))
1107 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1108 else if (InputSigned)
1109 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1111 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1112 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1113 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1114 if (DstEltType->isSignedIntegerOrEnumerationType())
1115 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1117 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1119 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1120 "Unknown real conversion");
1121 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1122 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1124 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1130 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1132 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1134 CGF.EmitScalarExpr(E->getBase());
1136 EmitLValue(E->getBase());
1137 return Builder.getInt(Value);
1140 return EmitLoadOfLValue(E);
1143 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1144 TestAndClearIgnoreResultAssign();
1146 // Emit subscript expressions in rvalue context's. For most cases, this just
1147 // loads the lvalue formed by the subscript expr. However, we have to be
1148 // careful, because the base of a vector subscript is occasionally an rvalue,
1149 // so we can't get it as an lvalue.
1150 if (!E->getBase()->getType()->isVectorType())
1151 return EmitLoadOfLValue(E);
1153 // Handle the vector case. The base must be a vector, the index must be an
1155 Value *Base = Visit(E->getBase());
1156 Value *Idx = Visit(E->getIdx());
1157 QualType IdxTy = E->getIdx()->getType();
1159 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
1160 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1162 return Builder.CreateExtractElement(Base, Idx, "vecext");
1165 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1166 unsigned Off, llvm::Type *I32Ty) {
1167 int MV = SVI->getMaskValue(Idx);
1169 return llvm::UndefValue::get(I32Ty);
1170 return llvm::ConstantInt::get(I32Ty, Off+MV);
1173 static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) {
1174 if (C->getBitWidth() != 32) {
1175 assert(llvm::ConstantInt::isValueValidForType(I32Ty,
1176 C->getZExtValue()) &&
1177 "Index operand too large for shufflevector mask!");
1178 return llvm::ConstantInt::get(I32Ty, C->getZExtValue());
1183 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1184 bool Ignore = TestAndClearIgnoreResultAssign();
1186 assert (Ignore == false && "init list ignored");
1187 unsigned NumInitElements = E->getNumInits();
1189 if (E->hadArrayRangeDesignator())
1190 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1192 llvm::VectorType *VType =
1193 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1196 if (NumInitElements == 0) {
1197 // C++11 value-initialization for the scalar.
1198 return EmitNullValue(E->getType());
1200 // We have a scalar in braces. Just use the first element.
1201 return Visit(E->getInit(0));
1204 unsigned ResElts = VType->getNumElements();
1206 // Loop over initializers collecting the Value for each, and remembering
1207 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1208 // us to fold the shuffle for the swizzle into the shuffle for the vector
1209 // initializer, since LLVM optimizers generally do not want to touch
1211 unsigned CurIdx = 0;
1212 bool VIsUndefShuffle = false;
1213 llvm::Value *V = llvm::UndefValue::get(VType);
1214 for (unsigned i = 0; i != NumInitElements; ++i) {
1215 Expr *IE = E->getInit(i);
1216 Value *Init = Visit(IE);
1217 SmallVector<llvm::Constant*, 16> Args;
1219 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1221 // Handle scalar elements. If the scalar initializer is actually one
1222 // element of a different vector of the same width, use shuffle instead of
1225 if (isa<ExtVectorElementExpr>(IE)) {
1226 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1228 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1229 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1230 Value *LHS = nullptr, *RHS = nullptr;
1232 // insert into undef -> shuffle (src, undef)
1233 // shufflemask must use an i32
1234 Args.push_back(getAsInt32(C, CGF.Int32Ty));
1235 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1237 LHS = EI->getVectorOperand();
1239 VIsUndefShuffle = true;
1240 } else if (VIsUndefShuffle) {
1241 // insert into undefshuffle && size match -> shuffle (v, src)
1242 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1243 for (unsigned j = 0; j != CurIdx; ++j)
1244 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1245 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1246 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1248 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1249 RHS = EI->getVectorOperand();
1250 VIsUndefShuffle = false;
1252 if (!Args.empty()) {
1253 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1254 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1260 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1262 VIsUndefShuffle = false;
1267 unsigned InitElts = VVT->getNumElements();
1269 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1270 // input is the same width as the vector being constructed, generate an
1271 // optimized shuffle of the swizzle input into the result.
1272 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1273 if (isa<ExtVectorElementExpr>(IE)) {
1274 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1275 Value *SVOp = SVI->getOperand(0);
1276 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1278 if (OpTy->getNumElements() == ResElts) {
1279 for (unsigned j = 0; j != CurIdx; ++j) {
1280 // If the current vector initializer is a shuffle with undef, merge
1281 // this shuffle directly into it.
1282 if (VIsUndefShuffle) {
1283 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1286 Args.push_back(Builder.getInt32(j));
1289 for (unsigned j = 0, je = InitElts; j != je; ++j)
1290 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1291 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1293 if (VIsUndefShuffle)
1294 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1300 // Extend init to result vector length, and then shuffle its contribution
1301 // to the vector initializer into V.
1303 for (unsigned j = 0; j != InitElts; ++j)
1304 Args.push_back(Builder.getInt32(j));
1305 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1306 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1307 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1311 for (unsigned j = 0; j != CurIdx; ++j)
1312 Args.push_back(Builder.getInt32(j));
1313 for (unsigned j = 0; j != InitElts; ++j)
1314 Args.push_back(Builder.getInt32(j+Offset));
1315 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1318 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1319 // merging subsequent shuffles into this one.
1322 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1323 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1324 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1328 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1329 // Emit remaining default initializers.
1330 llvm::Type *EltTy = VType->getElementType();
1332 // Emit remaining default initializers
1333 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1334 Value *Idx = Builder.getInt32(CurIdx);
1335 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1336 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1341 bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) {
1342 const Expr *E = CE->getSubExpr();
1344 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1347 if (isa<CXXThisExpr>(E->IgnoreParens())) {
1348 // We always assume that 'this' is never null.
1352 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1353 // And that glvalue casts are never null.
1354 if (ICE->getValueKind() != VK_RValue)
1361 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1362 // have to handle a more broad range of conversions than explicit casts, as they
1363 // handle things like function to ptr-to-function decay etc.
1364 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1365 Expr *E = CE->getSubExpr();
1366 QualType DestTy = CE->getType();
1367 CastKind Kind = CE->getCastKind();
1369 if (!DestTy->isVoidType())
1370 TestAndClearIgnoreResultAssign();
1372 // Since almost all cast kinds apply to scalars, this switch doesn't have
1373 // a default case, so the compiler will warn on a missing case. The cases
1374 // are in the same order as in the CastKind enum.
1376 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1377 case CK_BuiltinFnToFnPtr:
1378 llvm_unreachable("builtin functions are handled elsewhere");
1380 case CK_LValueBitCast:
1381 case CK_ObjCObjectLValueCast: {
1382 Address Addr = EmitLValue(E).getAddress();
1383 Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy));
1384 LValue LV = CGF.MakeAddrLValue(Addr, DestTy);
1385 return EmitLoadOfLValue(LV, CE->getExprLoc());
1388 case CK_CPointerToObjCPointerCast:
1389 case CK_BlockPointerToObjCPointerCast:
1390 case CK_AnyPointerToBlockPointerCast:
1392 Value *Src = Visit(const_cast<Expr*>(E));
1393 llvm::Type *SrcTy = Src->getType();
1394 llvm::Type *DstTy = ConvertType(DestTy);
1395 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1396 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1397 llvm_unreachable("wrong cast for pointers in different address spaces"
1398 "(must be an address space cast)!");
1401 if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
1402 if (auto PT = DestTy->getAs<PointerType>())
1403 CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src,
1405 CodeGenFunction::CFITCK_UnrelatedCast,
1409 return Builder.CreateBitCast(Src, DstTy);
1411 case CK_AddressSpaceConversion: {
1412 Value *Src = Visit(const_cast<Expr*>(E));
1413 return Builder.CreateAddrSpaceCast(Src, ConvertType(DestTy));
1415 case CK_AtomicToNonAtomic:
1416 case CK_NonAtomicToAtomic:
1418 case CK_UserDefinedConversion:
1419 return Visit(const_cast<Expr*>(E));
1421 case CK_BaseToDerived: {
1422 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1423 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1425 Address Base = CGF.EmitPointerWithAlignment(E);
1427 CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl,
1428 CE->path_begin(), CE->path_end(),
1429 CGF.ShouldNullCheckClassCastValue(CE));
1431 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1432 // performed and the object is not of the derived type.
1433 if (CGF.sanitizePerformTypeCheck())
1434 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1435 Derived.getPointer(), DestTy->getPointeeType());
1437 if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
1438 CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(),
1439 Derived.getPointer(),
1441 CodeGenFunction::CFITCK_DerivedCast,
1444 return Derived.getPointer();
1446 case CK_UncheckedDerivedToBase:
1447 case CK_DerivedToBase: {
1448 // The EmitPointerWithAlignment path does this fine; just discard
1450 return CGF.EmitPointerWithAlignment(CE).getPointer();
1454 Address V = CGF.EmitPointerWithAlignment(E);
1455 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1456 return CGF.EmitDynamicCast(V, DCE);
1459 case CK_ArrayToPointerDecay:
1460 return CGF.EmitArrayToPointerDecay(E).getPointer();
1461 case CK_FunctionToPointerDecay:
1462 return EmitLValue(E).getPointer();
1464 case CK_NullToPointer:
1465 if (MustVisitNullValue(E))
1468 return llvm::ConstantPointerNull::get(
1469 cast<llvm::PointerType>(ConvertType(DestTy)));
1471 case CK_NullToMemberPointer: {
1472 if (MustVisitNullValue(E))
1475 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1476 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1479 case CK_ReinterpretMemberPointer:
1480 case CK_BaseToDerivedMemberPointer:
1481 case CK_DerivedToBaseMemberPointer: {
1482 Value *Src = Visit(E);
1484 // Note that the AST doesn't distinguish between checked and
1485 // unchecked member pointer conversions, so we always have to
1486 // implement checked conversions here. This is inefficient when
1487 // actual control flow may be required in order to perform the
1488 // check, which it is for data member pointers (but not member
1489 // function pointers on Itanium and ARM).
1490 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1493 case CK_ARCProduceObject:
1494 return CGF.EmitARCRetainScalarExpr(E);
1495 case CK_ARCConsumeObject:
1496 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1497 case CK_ARCReclaimReturnedObject: {
1498 llvm::Value *value = Visit(E);
1499 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
1500 return CGF.EmitObjCConsumeObject(E->getType(), value);
1502 case CK_ARCExtendBlockObject:
1503 return CGF.EmitARCExtendBlockObject(E);
1505 case CK_CopyAndAutoreleaseBlockObject:
1506 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1508 case CK_FloatingRealToComplex:
1509 case CK_FloatingComplexCast:
1510 case CK_IntegralRealToComplex:
1511 case CK_IntegralComplexCast:
1512 case CK_IntegralComplexToFloatingComplex:
1513 case CK_FloatingComplexToIntegralComplex:
1514 case CK_ConstructorConversion:
1516 llvm_unreachable("scalar cast to non-scalar value");
1518 case CK_LValueToRValue:
1519 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1520 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1521 return Visit(const_cast<Expr*>(E));
1523 case CK_IntegralToPointer: {
1524 Value *Src = Visit(const_cast<Expr*>(E));
1526 // First, convert to the correct width so that we control the kind of
1528 llvm::Type *MiddleTy = CGF.IntPtrTy;
1529 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1530 llvm::Value* IntResult =
1531 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1533 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
1535 case CK_PointerToIntegral:
1536 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1537 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1540 CGF.EmitIgnoredExpr(E);
1543 case CK_VectorSplat: {
1544 llvm::Type *DstTy = ConvertType(DestTy);
1545 Value *Elt = Visit(const_cast<Expr*>(E));
1546 // Splat the element across to all elements
1547 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
1548 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1551 case CK_IntegralCast:
1552 case CK_IntegralToFloating:
1553 case CK_FloatingToIntegral:
1554 case CK_FloatingCast:
1555 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1557 case CK_BooleanToSignedIntegral:
1558 return EmitScalarConversion(Visit(E), E->getType(), DestTy,
1560 /*TreatBooleanAsSigned=*/true);
1561 case CK_IntegralToBoolean:
1562 return EmitIntToBoolConversion(Visit(E));
1563 case CK_PointerToBoolean:
1564 return EmitPointerToBoolConversion(Visit(E));
1565 case CK_FloatingToBoolean:
1566 return EmitFloatToBoolConversion(Visit(E));
1567 case CK_MemberPointerToBoolean: {
1568 llvm::Value *MemPtr = Visit(E);
1569 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1570 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1573 case CK_FloatingComplexToReal:
1574 case CK_IntegralComplexToReal:
1575 return CGF.EmitComplexExpr(E, false, true).first;
1577 case CK_FloatingComplexToBoolean:
1578 case CK_IntegralComplexToBoolean: {
1579 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1581 // TODO: kill this function off, inline appropriate case here
1582 return EmitComplexToScalarConversion(V, E->getType(), DestTy,
1586 case CK_ZeroToOCLEvent: {
1587 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1588 return llvm::Constant::getNullValue(ConvertType(DestTy));
1593 llvm_unreachable("unknown scalar cast");
1596 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1597 CodeGenFunction::StmtExprEvaluation eval(CGF);
1598 Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1599 !E->getType()->isVoidType());
1600 if (!RetAlloca.isValid())
1602 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1606 //===----------------------------------------------------------------------===//
1608 //===----------------------------------------------------------------------===//
1610 static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
1611 llvm::Value *InVal, bool IsInc) {
1614 BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
1615 BinOp.Ty = E->getType();
1616 BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
1617 BinOp.FPContractable = false;
1622 llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
1623 const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
1624 llvm::Value *Amount =
1625 llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true);
1626 StringRef Name = IsInc ? "inc" : "dec";
1627 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1628 case LangOptions::SOB_Defined:
1629 return Builder.CreateAdd(InVal, Amount, Name);
1630 case LangOptions::SOB_Undefined:
1631 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
1632 return Builder.CreateNSWAdd(InVal, Amount, Name);
1634 case LangOptions::SOB_Trapping:
1635 return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc));
1637 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1641 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1642 bool isInc, bool isPre) {
1644 QualType type = E->getSubExpr()->getType();
1645 llvm::PHINode *atomicPHI = nullptr;
1649 int amount = (isInc ? 1 : -1);
1651 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1652 type = atomicTy->getValueType();
1653 if (isInc && type->isBooleanType()) {
1654 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1656 Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified())
1657 ->setAtomic(llvm::SequentiallyConsistent);
1658 return Builder.getTrue();
1660 // For atomic bool increment, we just store true and return it for
1661 // preincrement, do an atomic swap with true for postincrement
1662 return Builder.CreateAtomicRMW(llvm::AtomicRMWInst::Xchg,
1663 LV.getPointer(), True, llvm::SequentiallyConsistent);
1665 // Special case for atomic increment / decrement on integers, emit
1666 // atomicrmw instructions. We skip this if we want to be doing overflow
1667 // checking, and fall into the slow path with the atomic cmpxchg loop.
1668 if (!type->isBooleanType() && type->isIntegerType() &&
1669 !(type->isUnsignedIntegerType() &&
1670 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
1671 CGF.getLangOpts().getSignedOverflowBehavior() !=
1672 LangOptions::SOB_Trapping) {
1673 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1674 llvm::AtomicRMWInst::Sub;
1675 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1676 llvm::Instruction::Sub;
1677 llvm::Value *amt = CGF.EmitToMemory(
1678 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1679 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1680 LV.getPointer(), amt, llvm::SequentiallyConsistent);
1681 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1683 value = EmitLoadOfLValue(LV, E->getExprLoc());
1685 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1686 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1687 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1688 value = CGF.EmitToMemory(value, type);
1689 Builder.CreateBr(opBB);
1690 Builder.SetInsertPoint(opBB);
1691 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1692 atomicPHI->addIncoming(value, startBB);
1695 value = EmitLoadOfLValue(LV, E->getExprLoc());
1699 // Special case of integer increment that we have to check first: bool++.
1700 // Due to promotion rules, we get:
1701 // bool++ -> bool = bool + 1
1702 // -> bool = (int)bool + 1
1703 // -> bool = ((int)bool + 1 != 0)
1704 // An interesting aspect of this is that increment is always true.
1705 // Decrement does not have this property.
1706 if (isInc && type->isBooleanType()) {
1707 value = Builder.getTrue();
1709 // Most common case by far: integer increment.
1710 } else if (type->isIntegerType()) {
1711 // Note that signed integer inc/dec with width less than int can't
1712 // overflow because of promotion rules; we're just eliding a few steps here.
1713 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1714 CGF.IntTy->getIntegerBitWidth();
1715 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1716 value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
1717 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1718 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
1720 EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc));
1722 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1723 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1726 // Next most common: pointer increment.
1727 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1728 QualType type = ptr->getPointeeType();
1730 // VLA types don't have constant size.
1731 if (const VariableArrayType *vla
1732 = CGF.getContext().getAsVariableArrayType(type)) {
1733 llvm::Value *numElts = CGF.getVLASize(vla).first;
1734 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1735 if (CGF.getLangOpts().isSignedOverflowDefined())
1736 value = Builder.CreateGEP(value, numElts, "vla.inc");
1738 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1740 // Arithmetic on function pointers (!) is just +-1.
1741 } else if (type->isFunctionType()) {
1742 llvm::Value *amt = Builder.getInt32(amount);
1744 value = CGF.EmitCastToVoidPtr(value);
1745 if (CGF.getLangOpts().isSignedOverflowDefined())
1746 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1748 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1749 value = Builder.CreateBitCast(value, input->getType());
1751 // For everything else, we can just do a simple increment.
1753 llvm::Value *amt = Builder.getInt32(amount);
1754 if (CGF.getLangOpts().isSignedOverflowDefined())
1755 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1757 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1760 // Vector increment/decrement.
1761 } else if (type->isVectorType()) {
1762 if (type->hasIntegerRepresentation()) {
1763 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1765 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1767 value = Builder.CreateFAdd(
1769 llvm::ConstantFP::get(value->getType(), amount),
1770 isInc ? "inc" : "dec");
1774 } else if (type->isRealFloatingType()) {
1775 // Add the inc/dec to the real part.
1778 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1779 // Another special case: half FP increment should be done via float
1780 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1781 value = Builder.CreateCall(
1782 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1784 input, "incdec.conv");
1786 value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv");
1790 if (value->getType()->isFloatTy())
1791 amt = llvm::ConstantFP::get(VMContext,
1792 llvm::APFloat(static_cast<float>(amount)));
1793 else if (value->getType()->isDoubleTy())
1794 amt = llvm::ConstantFP::get(VMContext,
1795 llvm::APFloat(static_cast<double>(amount)));
1797 // Remaining types are either Half or LongDouble. Convert from float.
1798 llvm::APFloat F(static_cast<float>(amount));
1800 // Don't use getFloatTypeSemantics because Half isn't
1801 // necessarily represented using the "half" LLVM type.
1802 F.convert(value->getType()->isHalfTy()
1803 ? CGF.getTarget().getHalfFormat()
1804 : CGF.getTarget().getLongDoubleFormat(),
1805 llvm::APFloat::rmTowardZero, &ignored);
1806 amt = llvm::ConstantFP::get(VMContext, F);
1808 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1810 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1811 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1812 value = Builder.CreateCall(
1813 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
1815 value, "incdec.conv");
1817 value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv");
1821 // Objective-C pointer types.
1823 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1824 value = CGF.EmitCastToVoidPtr(value);
1826 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1827 if (!isInc) size = -size;
1828 llvm::Value *sizeValue =
1829 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1831 if (CGF.getLangOpts().isSignedOverflowDefined())
1832 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1834 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
1835 value = Builder.CreateBitCast(value, input->getType());
1839 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1840 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1841 auto Pair = CGF.EmitAtomicCompareExchange(
1842 LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
1843 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
1844 llvm::Value *success = Pair.second;
1845 atomicPHI->addIncoming(old, opBB);
1846 Builder.CreateCondBr(success, contBB, opBB);
1847 Builder.SetInsertPoint(contBB);
1848 return isPre ? value : input;
1851 // Store the updated result through the lvalue.
1852 if (LV.isBitField())
1853 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
1855 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
1857 // If this is a postinc, return the value read from memory, otherwise use the
1859 return isPre ? value : input;
1864 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
1865 TestAndClearIgnoreResultAssign();
1866 // Emit unary minus with EmitSub so we handle overflow cases etc.
1868 BinOp.RHS = Visit(E->getSubExpr());
1870 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1871 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1873 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
1874 BinOp.Ty = E->getType();
1875 BinOp.Opcode = BO_Sub;
1876 BinOp.FPContractable = false;
1878 return EmitSub(BinOp);
1881 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
1882 TestAndClearIgnoreResultAssign();
1883 Value *Op = Visit(E->getSubExpr());
1884 return Builder.CreateNot(Op, "neg");
1887 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1888 // Perform vector logical not on comparison with zero vector.
1889 if (E->getType()->isExtVectorType()) {
1890 Value *Oper = Visit(E->getSubExpr());
1891 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1893 if (Oper->getType()->isFPOrFPVectorTy())
1894 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1896 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1897 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1900 // Compare operand to zero.
1901 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
1904 // TODO: Could dynamically modify easy computations here. For example, if
1905 // the operand is an icmp ne, turn into icmp eq.
1906 BoolVal = Builder.CreateNot(BoolVal, "lnot");
1908 // ZExt result to the expr type.
1909 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
1912 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1913 // Try folding the offsetof to a constant.
1915 if (E->EvaluateAsInt(Value, CGF.getContext()))
1916 return Builder.getInt(Value);
1918 // Loop over the components of the offsetof to compute the value.
1919 unsigned n = E->getNumComponents();
1920 llvm::Type* ResultType = ConvertType(E->getType());
1921 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1922 QualType CurrentType = E->getTypeSourceInfo()->getType();
1923 for (unsigned i = 0; i != n; ++i) {
1924 OffsetOfNode ON = E->getComponent(i);
1925 llvm::Value *Offset = nullptr;
1926 switch (ON.getKind()) {
1927 case OffsetOfNode::Array: {
1928 // Compute the index
1929 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1930 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1931 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
1932 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1934 // Save the element type
1936 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1938 // Compute the element size
1939 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1940 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1942 // Multiply out to compute the result
1943 Offset = Builder.CreateMul(Idx, ElemSize);
1947 case OffsetOfNode::Field: {
1948 FieldDecl *MemberDecl = ON.getField();
1949 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1950 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1952 // Compute the index of the field in its parent.
1954 // FIXME: It would be nice if we didn't have to loop here!
1955 for (RecordDecl::field_iterator Field = RD->field_begin(),
1956 FieldEnd = RD->field_end();
1957 Field != FieldEnd; ++Field, ++i) {
1958 if (*Field == MemberDecl)
1961 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1963 // Compute the offset to the field
1964 int64_t OffsetInt = RL.getFieldOffset(i) /
1965 CGF.getContext().getCharWidth();
1966 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1968 // Save the element type.
1969 CurrentType = MemberDecl->getType();
1973 case OffsetOfNode::Identifier:
1974 llvm_unreachable("dependent __builtin_offsetof");
1976 case OffsetOfNode::Base: {
1977 if (ON.getBase()->isVirtual()) {
1978 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1982 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1983 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1985 // Save the element type.
1986 CurrentType = ON.getBase()->getType();
1988 // Compute the offset to the base.
1989 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1990 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
1991 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
1992 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
1996 Result = Builder.CreateAdd(Result, Offset);
2001 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
2002 /// argument of the sizeof expression as an integer.
2004 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
2005 const UnaryExprOrTypeTraitExpr *E) {
2006 QualType TypeToSize = E->getTypeOfArgument();
2007 if (E->getKind() == UETT_SizeOf) {
2008 if (const VariableArrayType *VAT =
2009 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
2010 if (E->isArgumentType()) {
2011 // sizeof(type) - make sure to emit the VLA size.
2012 CGF.EmitVariablyModifiedType(TypeToSize);
2014 // C99 6.5.3.4p2: If the argument is an expression of type
2015 // VLA, it is evaluated.
2016 CGF.EmitIgnoredExpr(E->getArgumentExpr());
2020 llvm::Value *numElts;
2021 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
2023 llvm::Value *size = numElts;
2025 // Scale the number of non-VLA elements by the non-VLA element size.
2026 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
2027 if (!eltSize.isOne())
2028 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
2032 } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) {
2035 .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign(
2036 E->getTypeOfArgument()->getPointeeType()))
2038 return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
2041 // If this isn't sizeof(vla), the result must be constant; use the constant
2042 // folding logic so we don't have to duplicate it here.
2043 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
2046 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
2047 Expr *Op = E->getSubExpr();
2048 if (Op->getType()->isAnyComplexType()) {
2049 // If it's an l-value, load through the appropriate subobject l-value.
2050 // Note that we have to ask E because Op might be an l-value that
2051 // this won't work for, e.g. an Obj-C property.
2053 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2054 E->getExprLoc()).getScalarVal();
2056 // Otherwise, calculate and project.
2057 return CGF.EmitComplexExpr(Op, false, true).first;
2063 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
2064 Expr *Op = E->getSubExpr();
2065 if (Op->getType()->isAnyComplexType()) {
2066 // If it's an l-value, load through the appropriate subobject l-value.
2067 // Note that we have to ask E because Op might be an l-value that
2068 // this won't work for, e.g. an Obj-C property.
2069 if (Op->isGLValue())
2070 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2071 E->getExprLoc()).getScalarVal();
2073 // Otherwise, calculate and project.
2074 return CGF.EmitComplexExpr(Op, true, false).second;
2077 // __imag on a scalar returns zero. Emit the subexpr to ensure side
2078 // effects are evaluated, but not the actual value.
2079 if (Op->isGLValue())
2082 CGF.EmitScalarExpr(Op, true);
2083 return llvm::Constant::getNullValue(ConvertType(E->getType()));
2086 //===----------------------------------------------------------------------===//
2088 //===----------------------------------------------------------------------===//
2090 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
2091 TestAndClearIgnoreResultAssign();
2093 Result.LHS = Visit(E->getLHS());
2094 Result.RHS = Visit(E->getRHS());
2095 Result.Ty = E->getType();
2096 Result.Opcode = E->getOpcode();
2097 Result.FPContractable = E->isFPContractable();
2102 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
2103 const CompoundAssignOperator *E,
2104 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2106 QualType LHSTy = E->getLHS()->getType();
2109 if (E->getComputationResultType()->isAnyComplexType())
2110 return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
2112 // Emit the RHS first. __block variables need to have the rhs evaluated
2113 // first, plus this should improve codegen a little.
2114 OpInfo.RHS = Visit(E->getRHS());
2115 OpInfo.Ty = E->getComputationResultType();
2116 OpInfo.Opcode = E->getOpcode();
2117 OpInfo.FPContractable = E->isFPContractable();
2119 // Load/convert the LHS.
2120 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2122 llvm::PHINode *atomicPHI = nullptr;
2123 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2124 QualType type = atomicTy->getValueType();
2125 if (!type->isBooleanType() && type->isIntegerType() &&
2126 !(type->isUnsignedIntegerType() &&
2127 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
2128 CGF.getLangOpts().getSignedOverflowBehavior() !=
2129 LangOptions::SOB_Trapping) {
2130 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2131 switch (OpInfo.Opcode) {
2132 // We don't have atomicrmw operands for *, %, /, <<, >>
2133 case BO_MulAssign: case BO_DivAssign:
2139 aop = llvm::AtomicRMWInst::Add;
2142 aop = llvm::AtomicRMWInst::Sub;
2145 aop = llvm::AtomicRMWInst::And;
2148 aop = llvm::AtomicRMWInst::Xor;
2151 aop = llvm::AtomicRMWInst::Or;
2154 llvm_unreachable("Invalid compound assignment type");
2156 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2157 llvm::Value *amt = CGF.EmitToMemory(
2158 EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy,
2161 Builder.CreateAtomicRMW(aop, LHSLV.getPointer(), amt,
2162 llvm::SequentiallyConsistent);
2166 // FIXME: For floating point types, we should be saving and restoring the
2167 // floating point environment in the loop.
2168 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2169 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2170 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2171 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2172 Builder.CreateBr(opBB);
2173 Builder.SetInsertPoint(opBB);
2174 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2175 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2176 OpInfo.LHS = atomicPHI;
2179 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2181 SourceLocation Loc = E->getExprLoc();
2183 EmitScalarConversion(OpInfo.LHS, LHSTy, E->getComputationLHSType(), Loc);
2185 // Expand the binary operator.
2186 Result = (this->*Func)(OpInfo);
2188 // Convert the result back to the LHS type.
2190 EmitScalarConversion(Result, E->getComputationResultType(), LHSTy, Loc);
2193 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2194 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2195 auto Pair = CGF.EmitAtomicCompareExchange(
2196 LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
2197 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
2198 llvm::Value *success = Pair.second;
2199 atomicPHI->addIncoming(old, opBB);
2200 Builder.CreateCondBr(success, contBB, opBB);
2201 Builder.SetInsertPoint(contBB);
2205 // Store the result value into the LHS lvalue. Bit-fields are handled
2206 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2207 // 'An assignment expression has the value of the left operand after the
2209 if (LHSLV.isBitField())
2210 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2212 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2217 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2218 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2219 bool Ignore = TestAndClearIgnoreResultAssign();
2221 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2223 // If the result is clearly ignored, return now.
2227 // The result of an assignment in C is the assigned r-value.
2228 if (!CGF.getLangOpts().CPlusPlus)
2231 // If the lvalue is non-volatile, return the computed value of the assignment.
2232 if (!LHS.isVolatileQualified())
2235 // Otherwise, reload the value.
2236 return EmitLoadOfLValue(LHS, E->getExprLoc());
2239 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2240 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2241 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks;
2243 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2244 Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
2245 SanitizerKind::IntegerDivideByZero));
2248 if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
2249 Ops.Ty->hasSignedIntegerRepresentation()) {
2250 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2252 llvm::Value *IntMin =
2253 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2254 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2256 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2257 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2258 llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2260 std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow));
2263 if (Checks.size() > 0)
2264 EmitBinOpCheck(Checks, Ops);
2267 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2269 CodeGenFunction::SanitizerScope SanScope(&CGF);
2270 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2271 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2272 Ops.Ty->isIntegerType()) {
2273 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2274 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2275 } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
2276 Ops.Ty->isRealFloatingType()) {
2277 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2278 llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
2279 EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero),
2284 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2285 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2286 if (CGF.getLangOpts().OpenCL) {
2287 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
2288 llvm::Type *ValTy = Val->getType();
2289 if (ValTy->isFloatTy() ||
2290 (isa<llvm::VectorType>(ValTy) &&
2291 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2292 CGF.SetFPAccuracy(Val, 2.5);
2296 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2297 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2299 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2302 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2303 // Rem in C can't be a floating point type: C99 6.5.5p2.
2304 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2305 CodeGenFunction::SanitizerScope SanScope(&CGF);
2306 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2308 if (Ops.Ty->isIntegerType())
2309 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2312 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2313 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2315 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2318 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2322 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2323 switch (Ops.Opcode) {
2327 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2328 llvm::Intrinsic::uadd_with_overflow;
2333 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2334 llvm::Intrinsic::usub_with_overflow;
2339 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2340 llvm::Intrinsic::umul_with_overflow;
2343 llvm_unreachable("Unsupported operation for overflow detection");
2349 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2351 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2353 Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
2354 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2355 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2357 // Handle overflow with llvm.trap if no custom handler has been specified.
2358 const std::string *handlerName =
2359 &CGF.getLangOpts().OverflowHandler;
2360 if (handlerName->empty()) {
2361 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2362 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2363 if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
2364 CodeGenFunction::SanitizerScope SanScope(&CGF);
2365 llvm::Value *NotOverflow = Builder.CreateNot(overflow);
2366 SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow
2367 : SanitizerKind::UnsignedIntegerOverflow;
2368 EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops);
2370 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2374 // Branch in case of overflow.
2375 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2376 llvm::Function::iterator insertPt = initialBB->getIterator();
2377 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2378 &*std::next(insertPt));
2379 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2381 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2383 // If an overflow handler is set, then we want to call it and then use its
2384 // result, if it returns.
2385 Builder.SetInsertPoint(overflowBB);
2387 // Get the overflow handler.
2388 llvm::Type *Int8Ty = CGF.Int8Ty;
2389 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2390 llvm::FunctionType *handlerTy =
2391 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2392 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2394 // Sign extend the args to 64-bit, so that we can use the same handler for
2395 // all types of overflow.
2396 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2397 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2399 // Call the handler with the two arguments, the operation, and the size of
2401 llvm::Value *handlerArgs[] = {
2404 Builder.getInt8(OpID),
2405 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2407 llvm::Value *handlerResult =
2408 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2410 // Truncate the result back to the desired size.
2411 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2412 Builder.CreateBr(continueBB);
2414 Builder.SetInsertPoint(continueBB);
2415 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2416 phi->addIncoming(result, initialBB);
2417 phi->addIncoming(handlerResult, overflowBB);
2422 /// Emit pointer + index arithmetic.
2423 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2424 const BinOpInfo &op,
2425 bool isSubtraction) {
2426 // Must have binary (not unary) expr here. Unary pointer
2427 // increment/decrement doesn't use this path.
2428 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2430 Value *pointer = op.LHS;
2431 Expr *pointerOperand = expr->getLHS();
2432 Value *index = op.RHS;
2433 Expr *indexOperand = expr->getRHS();
2435 // In a subtraction, the LHS is always the pointer.
2436 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2437 std::swap(pointer, index);
2438 std::swap(pointerOperand, indexOperand);
2441 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2442 if (width != CGF.PointerWidthInBits) {
2443 // Zero-extend or sign-extend the pointer value according to
2444 // whether the index is signed or not.
2445 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2446 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2450 // If this is subtraction, negate the index.
2452 index = CGF.Builder.CreateNeg(index, "idx.neg");
2454 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
2455 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2456 /*Accessed*/ false);
2458 const PointerType *pointerType
2459 = pointerOperand->getType()->getAs<PointerType>();
2461 QualType objectType = pointerOperand->getType()
2462 ->castAs<ObjCObjectPointerType>()
2464 llvm::Value *objectSize
2465 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2467 index = CGF.Builder.CreateMul(index, objectSize);
2469 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2470 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2471 return CGF.Builder.CreateBitCast(result, pointer->getType());
2474 QualType elementType = pointerType->getPointeeType();
2475 if (const VariableArrayType *vla
2476 = CGF.getContext().getAsVariableArrayType(elementType)) {
2477 // The element count here is the total number of non-VLA elements.
2478 llvm::Value *numElements = CGF.getVLASize(vla).first;
2480 // Effectively, the multiply by the VLA size is part of the GEP.
2481 // GEP indexes are signed, and scaling an index isn't permitted to
2482 // signed-overflow, so we use the same semantics for our explicit
2483 // multiply. We suppress this if overflow is not undefined behavior.
2484 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2485 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2486 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2488 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2489 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2494 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2495 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2497 if (elementType->isVoidType() || elementType->isFunctionType()) {
2498 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2499 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2500 return CGF.Builder.CreateBitCast(result, pointer->getType());
2503 if (CGF.getLangOpts().isSignedOverflowDefined())
2504 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2506 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2509 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2510 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2511 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2512 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2513 // efficient operations.
2514 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2515 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2516 bool negMul, bool negAdd) {
2517 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2519 Value *MulOp0 = MulOp->getOperand(0);
2520 Value *MulOp1 = MulOp->getOperand(1);
2524 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2526 } else if (negAdd) {
2529 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2533 Value *FMulAdd = Builder.CreateCall(
2534 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2535 {MulOp0, MulOp1, Addend});
2536 MulOp->eraseFromParent();
2541 // Check whether it would be legal to emit an fmuladd intrinsic call to
2542 // represent op and if so, build the fmuladd.
2544 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2545 // Does NOT check the type of the operation - it's assumed that this function
2546 // will be called from contexts where it's known that the type is contractable.
2547 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2548 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2551 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2552 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2553 "Only fadd/fsub can be the root of an fmuladd.");
2555 // Check whether this op is marked as fusable.
2556 if (!op.FPContractable)
2559 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2560 // either disabled, or handled entirely by the LLVM backend).
2561 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
2564 // We have a potentially fusable op. Look for a mul on one of the operands.
2565 // Also, make sure that the mul result isn't used directly. In that case,
2566 // there's no point creating a muladd operation.
2567 if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2568 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2569 LHSBinOp->use_empty())
2570 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2572 if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2573 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul &&
2574 RHSBinOp->use_empty())
2575 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2581 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2582 if (op.LHS->getType()->isPointerTy() ||
2583 op.RHS->getType()->isPointerTy())
2584 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2586 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2587 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2588 case LangOptions::SOB_Defined:
2589 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2590 case LangOptions::SOB_Undefined:
2591 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2592 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2594 case LangOptions::SOB_Trapping:
2595 return EmitOverflowCheckedBinOp(op);
2599 if (op.Ty->isUnsignedIntegerType() &&
2600 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2601 return EmitOverflowCheckedBinOp(op);
2603 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2604 // Try to form an fmuladd.
2605 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2608 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
2611 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2614 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2615 // The LHS is always a pointer if either side is.
2616 if (!op.LHS->getType()->isPointerTy()) {
2617 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2618 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2619 case LangOptions::SOB_Defined:
2620 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2621 case LangOptions::SOB_Undefined:
2622 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2623 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2625 case LangOptions::SOB_Trapping:
2626 return EmitOverflowCheckedBinOp(op);
2630 if (op.Ty->isUnsignedIntegerType() &&
2631 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2632 return EmitOverflowCheckedBinOp(op);
2634 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2635 // Try to form an fmuladd.
2636 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2638 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
2641 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2644 // If the RHS is not a pointer, then we have normal pointer
2646 if (!op.RHS->getType()->isPointerTy())
2647 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2649 // Otherwise, this is a pointer subtraction.
2651 // Do the raw subtraction part.
2653 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2655 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2656 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2658 // Okay, figure out the element size.
2659 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2660 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2662 llvm::Value *divisor = nullptr;
2664 // For a variable-length array, this is going to be non-constant.
2665 if (const VariableArrayType *vla
2666 = CGF.getContext().getAsVariableArrayType(elementType)) {
2667 llvm::Value *numElements;
2668 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2670 divisor = numElements;
2672 // Scale the number of non-VLA elements by the non-VLA element size.
2673 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2674 if (!eltSize.isOne())
2675 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2677 // For everything elese, we can just compute it, safe in the
2678 // assumption that Sema won't let anything through that we can't
2679 // safely compute the size of.
2681 CharUnits elementSize;
2682 // Handle GCC extension for pointer arithmetic on void* and
2683 // function pointer types.
2684 if (elementType->isVoidType() || elementType->isFunctionType())
2685 elementSize = CharUnits::One();
2687 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2689 // Don't even emit the divide for element size of 1.
2690 if (elementSize.isOne())
2693 divisor = CGF.CGM.getSize(elementSize);
2696 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2697 // pointer difference in C is only defined in the case where both operands
2698 // are pointing to elements of an array.
2699 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2702 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2703 llvm::IntegerType *Ty;
2704 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2705 Ty = cast<llvm::IntegerType>(VT->getElementType());
2707 Ty = cast<llvm::IntegerType>(LHS->getType());
2708 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2711 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2712 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2713 // RHS to the same size as the LHS.
2714 Value *RHS = Ops.RHS;
2715 if (Ops.LHS->getType() != RHS->getType())
2716 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2718 bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
2719 Ops.Ty->hasSignedIntegerRepresentation();
2720 bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
2721 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2722 if (CGF.getLangOpts().OpenCL)
2724 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2725 else if ((SanitizeBase || SanitizeExponent) &&
2726 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2727 CodeGenFunction::SanitizerScope SanScope(&CGF);
2728 SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks;
2729 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
2730 llvm::Value *ValidExponent = Builder.CreateICmpULE(RHS, WidthMinusOne);
2732 if (SanitizeExponent) {
2734 std::make_pair(ValidExponent, SanitizerKind::ShiftExponent));
2738 // Check whether we are shifting any non-zero bits off the top of the
2739 // integer. We only emit this check if exponent is valid - otherwise
2740 // instructions below will have undefined behavior themselves.
2741 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2742 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2743 llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
2744 Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
2745 CGF.EmitBlock(CheckShiftBase);
2746 llvm::Value *BitsShiftedOff =
2747 Builder.CreateLShr(Ops.LHS,
2748 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2749 /*NUW*/true, /*NSW*/true),
2751 if (CGF.getLangOpts().CPlusPlus) {
2752 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2753 // Under C++11's rules, shifting a 1 bit into the sign bit is
2754 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2755 // define signed left shifts, so we use the C99 and C++11 rules there).
2756 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2757 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2759 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2760 llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2761 CGF.EmitBlock(Cont);
2762 llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
2763 BaseCheck->addIncoming(Builder.getTrue(), Orig);
2764 BaseCheck->addIncoming(ValidBase, CheckShiftBase);
2765 Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase));
2768 assert(!Checks.empty());
2769 EmitBinOpCheck(Checks, Ops);
2772 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2775 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2776 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2777 // RHS to the same size as the LHS.
2778 Value *RHS = Ops.RHS;
2779 if (Ops.LHS->getType() != RHS->getType())
2780 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2782 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2783 if (CGF.getLangOpts().OpenCL)
2785 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2786 else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
2787 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2788 CodeGenFunction::SanitizerScope SanScope(&CGF);
2789 llvm::Value *Valid =
2790 Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS));
2791 EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops);
2794 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2795 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2796 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2799 enum IntrinsicType { VCMPEQ, VCMPGT };
2800 // return corresponding comparison intrinsic for given vector type
2801 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2802 BuiltinType::Kind ElemKind) {
2804 default: llvm_unreachable("unexpected element type");
2805 case BuiltinType::Char_U:
2806 case BuiltinType::UChar:
2807 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2808 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
2809 case BuiltinType::Char_S:
2810 case BuiltinType::SChar:
2811 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2812 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
2813 case BuiltinType::UShort:
2814 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2815 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
2816 case BuiltinType::Short:
2817 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2818 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
2819 case BuiltinType::UInt:
2820 case BuiltinType::ULong:
2821 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2822 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
2823 case BuiltinType::Int:
2824 case BuiltinType::Long:
2825 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2826 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
2827 case BuiltinType::Float:
2828 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2829 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
2833 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,
2834 llvm::CmpInst::Predicate UICmpOpc,
2835 llvm::CmpInst::Predicate SICmpOpc,
2836 llvm::CmpInst::Predicate FCmpOpc) {
2837 TestAndClearIgnoreResultAssign();
2839 QualType LHSTy = E->getLHS()->getType();
2840 QualType RHSTy = E->getRHS()->getType();
2841 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
2842 assert(E->getOpcode() == BO_EQ ||
2843 E->getOpcode() == BO_NE);
2844 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2845 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
2846 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
2847 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
2848 } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
2849 Value *LHS = Visit(E->getLHS());
2850 Value *RHS = Visit(E->getRHS());
2852 // If AltiVec, the comparison results in a numeric type, so we use
2853 // intrinsics comparing vectors and giving 0 or 1 as a result
2854 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
2855 // constants for mapping CR6 register bits to predicate result
2856 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2858 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2860 // in several cases vector arguments order will be reversed
2861 Value *FirstVecArg = LHS,
2862 *SecondVecArg = RHS;
2864 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
2865 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
2866 BuiltinType::Kind ElementKind = BTy->getKind();
2868 switch(E->getOpcode()) {
2869 default: llvm_unreachable("is not a comparison operation");
2872 ID = GetIntrinsic(VCMPEQ, ElementKind);
2876 ID = GetIntrinsic(VCMPEQ, ElementKind);
2880 ID = GetIntrinsic(VCMPGT, ElementKind);
2881 std::swap(FirstVecArg, SecondVecArg);
2885 ID = GetIntrinsic(VCMPGT, ElementKind);
2888 if (ElementKind == BuiltinType::Float) {
2890 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2891 std::swap(FirstVecArg, SecondVecArg);
2895 ID = GetIntrinsic(VCMPGT, ElementKind);
2899 if (ElementKind == BuiltinType::Float) {
2901 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2905 ID = GetIntrinsic(VCMPGT, ElementKind);
2906 std::swap(FirstVecArg, SecondVecArg);
2911 Value *CR6Param = Builder.getInt32(CR6);
2912 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2913 Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
2914 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
2918 if (LHS->getType()->isFPOrFPVectorTy()) {
2919 Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp");
2920 } else if (LHSTy->hasSignedIntegerRepresentation()) {
2921 Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp");
2923 // Unsigned integers and pointers.
2924 Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp");
2927 // If this is a vector comparison, sign extend the result to the appropriate
2928 // vector integer type and return it (don't convert to bool).
2929 if (LHSTy->isVectorType())
2930 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2933 // Complex Comparison: can only be an equality comparison.
2934 CodeGenFunction::ComplexPairTy LHS, RHS;
2936 if (auto *CTy = LHSTy->getAs<ComplexType>()) {
2937 LHS = CGF.EmitComplexExpr(E->getLHS());
2938 CETy = CTy->getElementType();
2940 LHS.first = Visit(E->getLHS());
2941 LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
2944 if (auto *CTy = RHSTy->getAs<ComplexType>()) {
2945 RHS = CGF.EmitComplexExpr(E->getRHS());
2946 assert(CGF.getContext().hasSameUnqualifiedType(CETy,
2947 CTy->getElementType()) &&
2948 "The element types must always match.");
2951 RHS.first = Visit(E->getRHS());
2952 RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
2953 assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
2954 "The element types must always match.");
2957 Value *ResultR, *ResultI;
2958 if (CETy->isRealFloatingType()) {
2959 ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r");
2960 ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i");
2962 // Complex comparisons can only be equality comparisons. As such, signed
2963 // and unsigned opcodes are the same.
2964 ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r");
2965 ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i");
2968 if (E->getOpcode() == BO_EQ) {
2969 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2971 assert(E->getOpcode() == BO_NE &&
2972 "Complex comparison other than == or != ?");
2973 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2977 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
2981 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
2982 bool Ignore = TestAndClearIgnoreResultAssign();
2987 switch (E->getLHS()->getType().getObjCLifetime()) {
2988 case Qualifiers::OCL_Strong:
2989 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
2992 case Qualifiers::OCL_Autoreleasing:
2993 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
2996 case Qualifiers::OCL_Weak:
2997 RHS = Visit(E->getRHS());
2998 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2999 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
3002 // No reason to do any of these differently.
3003 case Qualifiers::OCL_None:
3004 case Qualifiers::OCL_ExplicitNone:
3005 // __block variables need to have the rhs evaluated first, plus
3006 // this should improve codegen just a little.
3007 RHS = Visit(E->getRHS());
3008 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3010 // Store the value into the LHS. Bit-fields are handled specially
3011 // because the result is altered by the store, i.e., [C99 6.5.16p1]
3012 // 'An assignment expression has the value of the left operand after
3013 // the assignment...'.
3014 if (LHS.isBitField())
3015 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
3017 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
3020 // If the result is clearly ignored, return now.
3024 // The result of an assignment in C is the assigned r-value.
3025 if (!CGF.getLangOpts().CPlusPlus)
3028 // If the lvalue is non-volatile, return the computed value of the assignment.
3029 if (!LHS.isVolatileQualified())
3032 // Otherwise, reload the value.
3033 return EmitLoadOfLValue(LHS, E->getExprLoc());
3036 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
3037 // Perform vector logical and on comparisons with zero vectors.
3038 if (E->getType()->isVectorType()) {
3039 CGF.incrementProfileCounter(E);
3041 Value *LHS = Visit(E->getLHS());
3042 Value *RHS = Visit(E->getRHS());
3043 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3044 if (LHS->getType()->isFPOrFPVectorTy()) {
3045 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3046 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3048 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3049 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3051 Value *And = Builder.CreateAnd(LHS, RHS);
3052 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
3055 llvm::Type *ResTy = ConvertType(E->getType());
3057 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
3058 // If we have 1 && X, just emit X without inserting the control flow.
3060 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3061 if (LHSCondVal) { // If we have 1 && X, just emit X.
3062 CGF.incrementProfileCounter(E);
3064 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3065 // ZExt result to int or bool.
3066 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
3069 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
3070 if (!CGF.ContainsLabel(E->getRHS()))
3071 return llvm::Constant::getNullValue(ResTy);
3074 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
3075 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
3077 CodeGenFunction::ConditionalEvaluation eval(CGF);
3079 // Branch on the LHS first. If it is false, go to the failure (cont) block.
3080 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock,
3081 CGF.getProfileCount(E->getRHS()));
3083 // Any edges into the ContBlock are now from an (indeterminate number of)
3084 // edges from this first condition. All of these values will be false. Start
3085 // setting up the PHI node in the Cont Block for this.
3086 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3088 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3090 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
3093 CGF.EmitBlock(RHSBlock);
3094 CGF.incrementProfileCounter(E);
3095 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3098 // Reaquire the RHS block, as there may be subblocks inserted.
3099 RHSBlock = Builder.GetInsertBlock();
3101 // Emit an unconditional branch from this block to ContBlock.
3103 // There is no need to emit line number for unconditional branch.
3104 auto NL = ApplyDebugLocation::CreateEmpty(CGF);
3105 CGF.EmitBlock(ContBlock);
3107 // Insert an entry into the phi node for the edge with the value of RHSCond.
3108 PN->addIncoming(RHSCond, RHSBlock);
3110 // ZExt result to int.
3111 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
3114 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
3115 // Perform vector logical or on comparisons with zero vectors.
3116 if (E->getType()->isVectorType()) {
3117 CGF.incrementProfileCounter(E);
3119 Value *LHS = Visit(E->getLHS());
3120 Value *RHS = Visit(E->getRHS());
3121 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3122 if (LHS->getType()->isFPOrFPVectorTy()) {
3123 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3124 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3126 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3127 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3129 Value *Or = Builder.CreateOr(LHS, RHS);
3130 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
3133 llvm::Type *ResTy = ConvertType(E->getType());
3135 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
3136 // If we have 0 || X, just emit X without inserting the control flow.
3138 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3139 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3140 CGF.incrementProfileCounter(E);
3142 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3143 // ZExt result to int or bool.
3144 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3147 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3148 if (!CGF.ContainsLabel(E->getRHS()))
3149 return llvm::ConstantInt::get(ResTy, 1);
3152 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3153 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3155 CodeGenFunction::ConditionalEvaluation eval(CGF);
3157 // Branch on the LHS first. If it is true, go to the success (cont) block.
3158 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3159 CGF.getCurrentProfileCount() -
3160 CGF.getProfileCount(E->getRHS()));
3162 // Any edges into the ContBlock are now from an (indeterminate number of)
3163 // edges from this first condition. All of these values will be true. Start
3164 // setting up the PHI node in the Cont Block for this.
3165 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3167 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3169 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3173 // Emit the RHS condition as a bool value.
3174 CGF.EmitBlock(RHSBlock);
3175 CGF.incrementProfileCounter(E);
3176 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3180 // Reaquire the RHS block, as there may be subblocks inserted.
3181 RHSBlock = Builder.GetInsertBlock();
3183 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3184 // into the phi node for the edge with the value of RHSCond.
3185 CGF.EmitBlock(ContBlock);
3186 PN->addIncoming(RHSCond, RHSBlock);
3188 // ZExt result to int.
3189 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3192 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3193 CGF.EmitIgnoredExpr(E->getLHS());
3194 CGF.EnsureInsertPoint();
3195 return Visit(E->getRHS());
3198 //===----------------------------------------------------------------------===//
3200 //===----------------------------------------------------------------------===//
3202 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3203 /// expression is cheap enough and side-effect-free enough to evaluate
3204 /// unconditionally instead of conditionally. This is used to convert control
3205 /// flow into selects in some cases.
3206 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3207 CodeGenFunction &CGF) {
3208 // Anything that is an integer or floating point constant is fine.
3209 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3211 // Even non-volatile automatic variables can't be evaluated unconditionally.
3212 // Referencing a thread_local may cause non-trivial initialization work to
3213 // occur. If we're inside a lambda and one of the variables is from the scope
3214 // outside the lambda, that function may have returned already. Reading its
3215 // locals is a bad idea. Also, these reads may introduce races there didn't
3216 // exist in the source-level program.
3220 Value *ScalarExprEmitter::
3221 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3222 TestAndClearIgnoreResultAssign();
3224 // Bind the common expression if necessary.
3225 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3227 Expr *condExpr = E->getCond();
3228 Expr *lhsExpr = E->getTrueExpr();
3229 Expr *rhsExpr = E->getFalseExpr();
3231 // If the condition constant folds and can be elided, try to avoid emitting
3232 // the condition and the dead arm.
3234 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3235 Expr *live = lhsExpr, *dead = rhsExpr;
3236 if (!CondExprBool) std::swap(live, dead);
3238 // If the dead side doesn't have labels we need, just emit the Live part.
3239 if (!CGF.ContainsLabel(dead)) {
3241 CGF.incrementProfileCounter(E);
3242 Value *Result = Visit(live);
3244 // If the live part is a throw expression, it acts like it has a void
3245 // type, so evaluating it returns a null Value*. However, a conditional
3246 // with non-void type must return a non-null Value*.
3247 if (!Result && !E->getType()->isVoidType())
3248 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3254 // OpenCL: If the condition is a vector, we can treat this condition like
3255 // the select function.
3256 if (CGF.getLangOpts().OpenCL
3257 && condExpr->getType()->isVectorType()) {
3258 CGF.incrementProfileCounter(E);
3260 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3261 llvm::Value *LHS = Visit(lhsExpr);
3262 llvm::Value *RHS = Visit(rhsExpr);
3264 llvm::Type *condType = ConvertType(condExpr->getType());
3265 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3267 unsigned numElem = vecTy->getNumElements();
3268 llvm::Type *elemType = vecTy->getElementType();
3270 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3271 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3272 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3273 llvm::VectorType::get(elemType,
3276 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3278 // Cast float to int to perform ANDs if necessary.
3279 llvm::Value *RHSTmp = RHS;
3280 llvm::Value *LHSTmp = LHS;
3281 bool wasCast = false;
3282 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3283 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3284 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3285 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3289 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3290 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3291 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3293 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3298 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3299 // select instead of as control flow. We can only do this if it is cheap and
3300 // safe to evaluate the LHS and RHS unconditionally.
3301 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3302 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3303 CGF.incrementProfileCounter(E);
3305 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3306 llvm::Value *LHS = Visit(lhsExpr);
3307 llvm::Value *RHS = Visit(rhsExpr);
3309 // If the conditional has void type, make sure we return a null Value*.
3310 assert(!RHS && "LHS and RHS types must match");
3313 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3316 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3317 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3318 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3320 CodeGenFunction::ConditionalEvaluation eval(CGF);
3321 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
3322 CGF.getProfileCount(lhsExpr));
3324 CGF.EmitBlock(LHSBlock);
3325 CGF.incrementProfileCounter(E);
3327 Value *LHS = Visit(lhsExpr);
3330 LHSBlock = Builder.GetInsertBlock();
3331 Builder.CreateBr(ContBlock);
3333 CGF.EmitBlock(RHSBlock);
3335 Value *RHS = Visit(rhsExpr);
3338 RHSBlock = Builder.GetInsertBlock();
3339 CGF.EmitBlock(ContBlock);
3341 // If the LHS or RHS is a throw expression, it will be legitimately null.
3347 // Create a PHI node for the real part.
3348 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3349 PN->addIncoming(LHS, LHSBlock);
3350 PN->addIncoming(RHS, RHSBlock);
3354 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3355 return Visit(E->getChosenSubExpr());
3358 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3359 QualType Ty = VE->getType();
3361 if (Ty->isVariablyModifiedType())
3362 CGF.EmitVariablyModifiedType(Ty);
3364 Address ArgValue = Address::invalid();
3365 Address ArgPtr = CGF.EmitVAArg(VE, ArgValue);
3367 llvm::Type *ArgTy = ConvertType(VE->getType());
3369 // If EmitVAArg fails, we fall back to the LLVM instruction.
3370 if (!ArgPtr.isValid())
3371 return Builder.CreateVAArg(ArgValue.getPointer(), ArgTy);
3373 // FIXME Volatility.
3374 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3376 // If EmitVAArg promoted the type, we must truncate it.
3377 if (ArgTy != Val->getType()) {
3378 if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy())
3379 Val = Builder.CreateIntToPtr(Val, ArgTy);
3381 Val = Builder.CreateTrunc(Val, ArgTy);
3387 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3388 return CGF.EmitBlockLiteral(block);
3391 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3392 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3393 llvm::Type *DstTy = ConvertType(E->getType());
3395 // Going from vec4->vec3 or vec3->vec4 is a special case and requires
3396 // a shuffle vector instead of a bitcast.
3397 llvm::Type *SrcTy = Src->getType();
3398 if (isa<llvm::VectorType>(DstTy) && isa<llvm::VectorType>(SrcTy)) {
3399 unsigned numElementsDst = cast<llvm::VectorType>(DstTy)->getNumElements();
3400 unsigned numElementsSrc = cast<llvm::VectorType>(SrcTy)->getNumElements();
3401 if ((numElementsDst == 3 && numElementsSrc == 4)
3402 || (numElementsDst == 4 && numElementsSrc == 3)) {
3405 // In the case of going from int4->float3, a bitcast is needed before
3407 llvm::Type *srcElemTy =
3408 cast<llvm::VectorType>(SrcTy)->getElementType();
3409 llvm::Type *dstElemTy =
3410 cast<llvm::VectorType>(DstTy)->getElementType();
3412 if ((srcElemTy->isIntegerTy() && dstElemTy->isFloatTy())
3413 || (srcElemTy->isFloatTy() && dstElemTy->isIntegerTy())) {
3414 // Create a float type of the same size as the source or destination.
3415 llvm::VectorType *newSrcTy = llvm::VectorType::get(dstElemTy,
3418 Src = Builder.CreateBitCast(Src, newSrcTy, "astypeCast");
3421 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3423 SmallVector<llvm::Constant*, 3> Args;
3424 Args.push_back(Builder.getInt32(0));
3425 Args.push_back(Builder.getInt32(1));
3426 Args.push_back(Builder.getInt32(2));
3428 if (numElementsDst == 4)
3429 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3431 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3433 return Builder.CreateShuffleVector(Src, UnV, Mask, "astype");
3437 return Builder.CreateBitCast(Src, DstTy, "astype");
3440 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3441 return CGF.EmitAtomicExpr(E).getScalarVal();
3444 //===----------------------------------------------------------------------===//
3445 // Entry Point into this File
3446 //===----------------------------------------------------------------------===//
3448 /// Emit the computation of the specified expression of scalar type, ignoring
3450 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3451 assert(E && hasScalarEvaluationKind(E->getType()) &&
3452 "Invalid scalar expression to emit");
3454 return ScalarExprEmitter(*this, IgnoreResultAssign)
3455 .Visit(const_cast<Expr *>(E));
3458 /// Emit a conversion from the specified type to the specified destination type,
3459 /// both of which are LLVM scalar types.
3460 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3462 SourceLocation Loc) {
3463 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3464 "Invalid scalar expression to emit");
3465 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc);
3468 /// Emit a conversion from the specified complex type to the specified
3469 /// destination type, where the destination type is an LLVM scalar type.
3470 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3473 SourceLocation Loc) {
3474 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3475 "Invalid complex -> scalar conversion");
3476 return ScalarExprEmitter(*this)
3477 .EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc);
3481 llvm::Value *CodeGenFunction::
3482 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3483 bool isInc, bool isPre) {
3484 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3487 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3488 // object->isa or (*object).isa
3489 // Generate code as for: *(Class*)object
3491 Expr *BaseExpr = E->getBase();
3492 Address Addr = Address::invalid();
3493 if (BaseExpr->isRValue()) {
3494 Addr = Address(EmitScalarExpr(BaseExpr), getPointerAlign());
3496 Addr = EmitLValue(BaseExpr).getAddress();
3499 // Cast the address to Class*.
3500 Addr = Builder.CreateElementBitCast(Addr, ConvertType(E->getType()));
3501 return MakeAddrLValue(Addr, E->getType());
3505 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3506 const CompoundAssignOperator *E) {
3507 ScalarExprEmitter Scalar(*this);
3508 Value *Result = nullptr;
3509 switch (E->getOpcode()) {
3510 #define COMPOUND_OP(Op) \
3511 case BO_##Op##Assign: \
3512 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3548 llvm_unreachable("Not valid compound assignment operators");
3551 llvm_unreachable("Unhandled compound assignment operator");