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 "clang/AST/ASTContext.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/RecordLayout.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "clang/Basic/TargetInfo.h"
24 #include "clang/Frontend/CodeGenOptions.h"
25 #include "llvm/IR/CFG.h"
26 #include "llvm/IR/Constants.h"
27 #include "llvm/IR/DataLayout.h"
28 #include "llvm/IR/Function.h"
29 #include "llvm/IR/GlobalVariable.h"
30 #include "llvm/IR/Intrinsics.h"
31 #include "llvm/IR/Module.h"
34 using namespace clang;
35 using namespace CodeGen;
38 //===----------------------------------------------------------------------===//
39 // Scalar Expression Emitter
40 //===----------------------------------------------------------------------===//
46 QualType Ty; // Computation Type.
47 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
49 const Expr *E; // Entire expr, for error unsupported. May not be binop.
52 static bool MustVisitNullValue(const Expr *E) {
53 // If a null pointer expression's type is the C++0x nullptr_t, then
54 // it's not necessarily a simple constant and it must be evaluated
55 // for its potential side effects.
56 return E->getType()->isNullPtrType();
59 class ScalarExprEmitter
60 : public StmtVisitor<ScalarExprEmitter, Value*> {
63 bool IgnoreResultAssign;
64 llvm::LLVMContext &VMContext;
67 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
68 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
69 VMContext(cgf.getLLVMContext()) {
72 //===--------------------------------------------------------------------===//
74 //===--------------------------------------------------------------------===//
76 bool TestAndClearIgnoreResultAssign() {
77 bool I = IgnoreResultAssign;
78 IgnoreResultAssign = false;
82 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
83 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
84 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
85 return CGF.EmitCheckedLValue(E, TCK);
88 void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks,
89 const BinOpInfo &Info);
91 Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
92 return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
95 void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
96 const AlignValueAttr *AVAttr = nullptr;
97 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
98 const ValueDecl *VD = DRE->getDecl();
100 if (VD->getType()->isReferenceType()) {
101 if (const auto *TTy =
102 dyn_cast<TypedefType>(VD->getType().getNonReferenceType()))
103 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
105 // Assumptions for function parameters are emitted at the start of the
106 // function, so there is no need to repeat that here.
107 if (isa<ParmVarDecl>(VD))
110 AVAttr = VD->getAttr<AlignValueAttr>();
115 if (const auto *TTy =
116 dyn_cast<TypedefType>(E->getType()))
117 AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
122 Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
123 llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
124 CGF.EmitAlignmentAssumption(V, AlignmentCI->getZExtValue());
127 /// EmitLoadOfLValue - Given an expression with complex type that represents a
128 /// value l-value, this method emits the address of the l-value, then loads
129 /// and returns the result.
130 Value *EmitLoadOfLValue(const Expr *E) {
131 Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
134 EmitLValueAlignmentAssumption(E, V);
138 /// EmitConversionToBool - Convert the specified expression value to a
139 /// boolean (i1) truth value. This is equivalent to "Val != 0".
140 Value *EmitConversionToBool(Value *Src, QualType DstTy);
142 /// \brief Emit a check that a conversion to or from a floating-point type
143 /// does not overflow.
144 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
145 Value *Src, QualType SrcType,
146 QualType DstType, llvm::Type *DstTy);
148 /// EmitScalarConversion - Emit a conversion from the specified type to the
149 /// specified destination type, both of which are LLVM scalar types.
150 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy);
152 /// EmitComplexToScalarConversion - Emit a conversion from the specified
153 /// complex type to the specified destination type, where the destination type
154 /// is an LLVM scalar type.
155 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
156 QualType SrcTy, QualType DstTy);
158 /// EmitNullValue - Emit a value that corresponds to null for the given type.
159 Value *EmitNullValue(QualType Ty);
161 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
162 Value *EmitFloatToBoolConversion(Value *V) {
163 // Compare against 0.0 for fp scalars.
164 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
165 return Builder.CreateFCmpUNE(V, Zero, "tobool");
168 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
169 Value *EmitPointerToBoolConversion(Value *V) {
170 Value *Zero = llvm::ConstantPointerNull::get(
171 cast<llvm::PointerType>(V->getType()));
172 return Builder.CreateICmpNE(V, Zero, "tobool");
175 Value *EmitIntToBoolConversion(Value *V) {
176 // Because of the type rules of C, we often end up computing a
177 // logical value, then zero extending it to int, then wanting it
178 // as a logical value again. Optimize this common case.
179 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
180 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
181 Value *Result = ZI->getOperand(0);
182 // If there aren't any more uses, zap the instruction to save space.
183 // Note that there can be more uses, for example if this
184 // is the result of an assignment.
186 ZI->eraseFromParent();
191 return Builder.CreateIsNotNull(V, "tobool");
194 //===--------------------------------------------------------------------===//
196 //===--------------------------------------------------------------------===//
198 Value *Visit(Expr *E) {
199 ApplyDebugLocation DL(CGF, E);
200 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
203 Value *VisitStmt(Stmt *S) {
204 S->dump(CGF.getContext().getSourceManager());
205 llvm_unreachable("Stmt can't have complex result type!");
207 Value *VisitExpr(Expr *S);
209 Value *VisitParenExpr(ParenExpr *PE) {
210 return Visit(PE->getSubExpr());
212 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
213 return Visit(E->getReplacement());
215 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
216 return Visit(GE->getResultExpr());
220 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
221 return Builder.getInt(E->getValue());
223 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
224 return llvm::ConstantFP::get(VMContext, E->getValue());
226 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
227 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
229 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
230 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
232 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
233 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
235 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
236 return EmitNullValue(E->getType());
238 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
239 return EmitNullValue(E->getType());
241 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
242 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
243 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
244 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
245 return Builder.CreateBitCast(V, ConvertType(E->getType()));
248 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
249 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
252 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
253 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
256 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
258 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E), E->getExprLoc());
260 // Otherwise, assume the mapping is the scalar directly.
261 return CGF.getOpaqueRValueMapping(E).getScalarVal();
265 Value *VisitDeclRefExpr(DeclRefExpr *E) {
266 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
267 if (result.isReference())
268 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E),
270 return result.getValue();
272 return EmitLoadOfLValue(E);
275 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
276 return CGF.EmitObjCSelectorExpr(E);
278 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
279 return CGF.EmitObjCProtocolExpr(E);
281 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
282 return EmitLoadOfLValue(E);
284 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
285 if (E->getMethodDecl() &&
286 E->getMethodDecl()->getReturnType()->isReferenceType())
287 return EmitLoadOfLValue(E);
288 return CGF.EmitObjCMessageExpr(E).getScalarVal();
291 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
292 LValue LV = CGF.EmitObjCIsaExpr(E);
293 Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
297 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
298 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
299 Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
300 Value *VisitMemberExpr(MemberExpr *E);
301 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
302 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
303 return EmitLoadOfLValue(E);
306 Value *VisitInitListExpr(InitListExpr *E);
308 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
309 return EmitNullValue(E->getType());
311 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
312 if (E->getType()->isVariablyModifiedType())
313 CGF.EmitVariablyModifiedType(E->getType());
315 if (CGDebugInfo *DI = CGF.getDebugInfo())
316 DI->EmitExplicitCastType(E->getType());
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()).getAddress();
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, unsigned UICmpOpc,
527 unsigned SICmpOpc, unsigned FCmpOpc);
528 #define VISITCOMP(CODE, UI, SI, FP) \
529 Value *VisitBin##CODE(const BinaryOperator *E) { \
530 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
531 llvm::FCmpInst::FP); }
532 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
533 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
534 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
535 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
536 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
537 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
540 Value *VisitBinAssign (const BinaryOperator *E);
542 Value *VisitBinLAnd (const BinaryOperator *E);
543 Value *VisitBinLOr (const BinaryOperator *E);
544 Value *VisitBinComma (const BinaryOperator *E);
546 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
547 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
550 Value *VisitBlockExpr(const BlockExpr *BE);
551 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
552 Value *VisitChooseExpr(ChooseExpr *CE);
553 Value *VisitVAArgExpr(VAArgExpr *VE);
554 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
555 return CGF.EmitObjCStringLiteral(E);
557 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
558 return CGF.EmitObjCBoxedExpr(E);
560 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
561 return CGF.EmitObjCArrayLiteral(E);
563 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
564 return CGF.EmitObjCDictionaryLiteral(E);
566 Value *VisitAsTypeExpr(AsTypeExpr *CE);
567 Value *VisitAtomicExpr(AtomicExpr *AE);
569 } // end anonymous namespace.
571 //===----------------------------------------------------------------------===//
573 //===----------------------------------------------------------------------===//
575 /// EmitConversionToBool - Convert the specified expression value to a
576 /// boolean (i1) truth value. This is equivalent to "Val != 0".
577 Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
578 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
580 if (SrcType->isRealFloatingType())
581 return EmitFloatToBoolConversion(Src);
583 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
584 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
586 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
587 "Unknown scalar type to convert");
589 if (isa<llvm::IntegerType>(Src->getType()))
590 return EmitIntToBoolConversion(Src);
592 assert(isa<llvm::PointerType>(Src->getType()));
593 return EmitPointerToBoolConversion(Src);
596 void ScalarExprEmitter::EmitFloatConversionCheck(Value *OrigSrc,
597 QualType OrigSrcType,
598 Value *Src, QualType SrcType,
601 CodeGenFunction::SanitizerScope SanScope(&CGF);
605 llvm::Type *SrcTy = Src->getType();
607 llvm::Value *Check = nullptr;
608 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
609 // Integer to floating-point. This can fail for unsigned short -> __half
610 // or unsigned __int128 -> float.
611 assert(DstType->isFloatingType());
612 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
614 APFloat LargestFloat =
615 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
616 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
619 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
620 &IsExact) != APFloat::opOK)
621 // The range of representable values of this floating point type includes
622 // all values of this integer type. Don't need an overflow check.
625 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
627 Check = Builder.CreateICmpULE(Src, Max);
629 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
630 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
631 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
632 Check = Builder.CreateAnd(GE, LE);
635 const llvm::fltSemantics &SrcSema =
636 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
637 if (isa<llvm::IntegerType>(DstTy)) {
638 // Floating-point to integer. This has undefined behavior if the source is
639 // +-Inf, NaN, or doesn't fit into the destination type (after truncation
641 unsigned Width = CGF.getContext().getIntWidth(DstType);
642 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
644 APSInt Min = APSInt::getMinValue(Width, Unsigned);
645 APFloat MinSrc(SrcSema, APFloat::uninitialized);
646 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
648 // Don't need an overflow check for lower bound. Just check for
650 MinSrc = APFloat::getInf(SrcSema, true);
652 // Find the largest value which is too small to represent (before
653 // truncation toward zero).
654 MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
656 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
657 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
658 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
660 // Don't need an overflow check for upper bound. Just check for
662 MaxSrc = APFloat::getInf(SrcSema, false);
664 // Find the smallest value which is too large to represent (before
665 // truncation toward zero).
666 MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
668 // If we're converting from __half, convert the range to float to match
670 if (OrigSrcType->isHalfType()) {
671 const llvm::fltSemantics &Sema =
672 CGF.getContext().getFloatTypeSemantics(SrcType);
674 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
675 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
679 Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
681 Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
682 Check = Builder.CreateAnd(GE, LE);
684 // FIXME: Maybe split this sanitizer out from float-cast-overflow.
686 // Floating-point to floating-point. This has undefined behavior if the
687 // source is not in the range of representable values of the destination
688 // type. The C and C++ standards are spectacularly unclear here. We
689 // diagnose finite out-of-range conversions, but allow infinities and NaNs
690 // to convert to the corresponding value in the smaller type.
692 // C11 Annex F gives all such conversions defined behavior for IEC 60559
693 // conforming implementations. Unfortunately, LLVM's fptrunc instruction
696 // Converting from a lower rank to a higher rank can never have
697 // undefined behavior, since higher-rank types must have a superset
698 // of values of lower-rank types.
699 if (CGF.getContext().getFloatingTypeOrder(OrigSrcType, DstType) != 1)
702 assert(!OrigSrcType->isHalfType() &&
703 "should not check conversion from __half, it has the lowest rank");
705 const llvm::fltSemantics &DstSema =
706 CGF.getContext().getFloatTypeSemantics(DstType);
707 APFloat MinBad = APFloat::getLargest(DstSema, false);
708 APFloat MaxBad = APFloat::getInf(DstSema, false);
711 MinBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
712 MaxBad.convert(SrcSema, APFloat::rmTowardZero, &IsInexact);
714 Value *AbsSrc = CGF.EmitNounwindRuntimeCall(
715 CGF.CGM.getIntrinsic(llvm::Intrinsic::fabs, Src->getType()), Src);
717 Builder.CreateFCmpOGT(AbsSrc, llvm::ConstantFP::get(VMContext, MinBad));
719 Builder.CreateFCmpOLT(AbsSrc, llvm::ConstantFP::get(VMContext, MaxBad));
720 Check = Builder.CreateNot(Builder.CreateAnd(GE, LE));
724 // FIXME: Provide a SourceLocation.
725 llvm::Constant *StaticArgs[] = {
726 CGF.EmitCheckTypeDescriptor(OrigSrcType),
727 CGF.EmitCheckTypeDescriptor(DstType)
729 CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow),
730 "float_cast_overflow", StaticArgs, OrigSrc);
733 /// EmitScalarConversion - Emit a conversion from the specified type to the
734 /// specified destination type, both of which are LLVM scalar types.
735 Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
737 SrcType = CGF.getContext().getCanonicalType(SrcType);
738 DstType = CGF.getContext().getCanonicalType(DstType);
739 if (SrcType == DstType) return Src;
741 if (DstType->isVoidType()) return nullptr;
743 llvm::Value *OrigSrc = Src;
744 QualType OrigSrcType = SrcType;
745 llvm::Type *SrcTy = Src->getType();
747 // Handle conversions to bool first, they are special: comparisons against 0.
748 if (DstType->isBooleanType())
749 return EmitConversionToBool(Src, SrcType);
751 llvm::Type *DstTy = ConvertType(DstType);
753 // Cast from half through float if half isn't a native type.
754 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
755 // Cast to FP using the intrinsic if the half type itself isn't supported.
756 if (DstTy->isFloatingPointTy()) {
757 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
758 return Builder.CreateCall(
759 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy),
762 // Cast to other types through float, using either the intrinsic or FPExt,
763 // depending on whether the half type itself is supported
764 // (as opposed to operations on half, available with NativeHalfType).
765 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
766 Src = Builder.CreateCall(
767 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
771 Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv");
773 SrcType = CGF.getContext().FloatTy;
778 // Ignore conversions like int -> uint.
782 // Handle pointer conversions next: pointers can only be converted to/from
783 // other pointers and integers. Check for pointer types in terms of LLVM, as
784 // some native types (like Obj-C id) may map to a pointer type.
785 if (isa<llvm::PointerType>(DstTy)) {
786 // The source value may be an integer, or a pointer.
787 if (isa<llvm::PointerType>(SrcTy))
788 return Builder.CreateBitCast(Src, DstTy, "conv");
790 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
791 // First, convert to the correct width so that we control the kind of
793 llvm::Type *MiddleTy = CGF.IntPtrTy;
794 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
795 llvm::Value* IntResult =
796 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
797 // Then, cast to pointer.
798 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
801 if (isa<llvm::PointerType>(SrcTy)) {
802 // Must be an ptr to int cast.
803 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
804 return Builder.CreatePtrToInt(Src, DstTy, "conv");
807 // A scalar can be splatted to an extended vector of the same element type
808 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
809 // Cast the scalar to element type
810 QualType EltTy = DstType->getAs<ExtVectorType>()->getElementType();
811 llvm::Value *Elt = EmitScalarConversion(Src, SrcType, EltTy);
813 // Splat the element across to all elements
814 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
815 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
818 // Allow bitcast from vector to integer/fp of the same size.
819 if (isa<llvm::VectorType>(SrcTy) ||
820 isa<llvm::VectorType>(DstTy))
821 return Builder.CreateBitCast(Src, DstTy, "conv");
823 // Finally, we have the arithmetic types: real int/float.
824 Value *Res = nullptr;
825 llvm::Type *ResTy = DstTy;
827 // An overflowing conversion has undefined behavior if either the source type
828 // or the destination type is a floating-point type.
829 if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) &&
830 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
831 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType,
834 // Cast to half through float if half isn't a native type.
835 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
836 // Make sure we cast in a single step if from another FP type.
837 if (SrcTy->isFloatingPointTy()) {
838 // Use the intrinsic if the half type itself isn't supported
839 // (as opposed to operations on half, available with NativeHalfType).
840 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns)
841 return Builder.CreateCall(
842 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src);
843 // If the half type is supported, just use an fptrunc.
844 return Builder.CreateFPTrunc(Src, DstTy);
849 if (isa<llvm::IntegerType>(SrcTy)) {
850 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
851 if (isa<llvm::IntegerType>(DstTy))
852 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
853 else if (InputSigned)
854 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
856 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
857 } else if (isa<llvm::IntegerType>(DstTy)) {
858 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
859 if (DstType->isSignedIntegerOrEnumerationType())
860 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
862 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
864 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
865 "Unknown real conversion");
866 if (DstTy->getTypeID() < SrcTy->getTypeID())
867 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
869 Res = Builder.CreateFPExt(Src, DstTy, "conv");
872 if (DstTy != ResTy) {
873 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
874 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
875 Res = Builder.CreateCall(
876 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy),
879 Res = Builder.CreateFPTrunc(Res, ResTy, "conv");
886 /// EmitComplexToScalarConversion - Emit a conversion from the specified complex
887 /// type to the specified destination type, where the destination type is an
888 /// LLVM scalar type.
889 Value *ScalarExprEmitter::
890 EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
891 QualType SrcTy, QualType DstTy) {
892 // Get the source element type.
893 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
895 // Handle conversions to bool first, they are special: comparisons against 0.
896 if (DstTy->isBooleanType()) {
897 // Complex != 0 -> (Real != 0) | (Imag != 0)
898 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy);
899 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy);
900 return Builder.CreateOr(Src.first, Src.second, "tobool");
903 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
904 // the imaginary part of the complex value is discarded and the value of the
905 // real part is converted according to the conversion rules for the
906 // corresponding real type.
907 return EmitScalarConversion(Src.first, SrcTy, DstTy);
910 Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
911 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
914 /// \brief Emit a sanitization check for the given "binary" operation (which
915 /// might actually be a unary increment which has been lowered to a binary
916 /// operation). The check passes if all values in \p Checks (which are \c i1),
918 void ScalarExprEmitter::EmitBinOpCheck(
919 ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) {
920 assert(CGF.IsSanitizerScope);
922 SmallVector<llvm::Constant *, 4> StaticData;
923 SmallVector<llvm::Value *, 2> DynamicData;
925 BinaryOperatorKind Opcode = Info.Opcode;
926 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
927 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
929 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
930 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
931 if (UO && UO->getOpcode() == UO_Minus) {
932 CheckName = "negate_overflow";
933 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
934 DynamicData.push_back(Info.RHS);
936 if (BinaryOperator::isShiftOp(Opcode)) {
937 // Shift LHS negative or too large, or RHS out of bounds.
938 CheckName = "shift_out_of_bounds";
939 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
940 StaticData.push_back(
941 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
942 StaticData.push_back(
943 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
944 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
945 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
946 CheckName = "divrem_overflow";
947 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
949 // Arithmetic overflow (+, -, *).
951 case BO_Add: CheckName = "add_overflow"; break;
952 case BO_Sub: CheckName = "sub_overflow"; break;
953 case BO_Mul: CheckName = "mul_overflow"; break;
954 default: llvm_unreachable("unexpected opcode for bin op check");
956 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
958 DynamicData.push_back(Info.LHS);
959 DynamicData.push_back(Info.RHS);
962 CGF.EmitCheck(Checks, CheckName, StaticData, DynamicData);
965 //===----------------------------------------------------------------------===//
967 //===----------------------------------------------------------------------===//
969 Value *ScalarExprEmitter::VisitExpr(Expr *E) {
970 CGF.ErrorUnsupported(E, "scalar expression");
971 if (E->getType()->isVoidType())
973 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
976 Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
978 if (E->getNumSubExprs() == 2 ||
979 (E->getNumSubExprs() == 3 && E->getExpr(2)->getType()->isVectorType())) {
980 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
981 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
984 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
985 unsigned LHSElts = LTy->getNumElements();
987 if (E->getNumSubExprs() == 3) {
988 Mask = CGF.EmitScalarExpr(E->getExpr(2));
990 // Shuffle LHS & RHS into one input vector.
991 SmallVector<llvm::Constant*, 32> concat;
992 for (unsigned i = 0; i != LHSElts; ++i) {
993 concat.push_back(Builder.getInt32(2*i));
994 concat.push_back(Builder.getInt32(2*i+1));
997 Value* CV = llvm::ConstantVector::get(concat);
998 LHS = Builder.CreateShuffleVector(LHS, RHS, CV, "concat");
1004 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
1005 llvm::Constant* EltMask;
1007 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
1008 llvm::NextPowerOf2(LHSElts-1)-1);
1010 // Mask off the high bits of each shuffle index.
1011 Value *MaskBits = llvm::ConstantVector::getSplat(MTy->getNumElements(),
1013 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
1016 // mask = mask & maskbits
1018 // n = extract mask i
1019 // x = extract val n
1020 // newv = insert newv, x, i
1021 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
1022 MTy->getNumElements());
1023 Value* NewV = llvm::UndefValue::get(RTy);
1024 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
1025 Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
1026 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
1028 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
1029 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
1034 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
1035 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
1037 SmallVector<llvm::Constant*, 32> indices;
1038 for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
1039 llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
1040 // Check for -1 and output it as undef in the IR.
1041 if (Idx.isSigned() && Idx.isAllOnesValue())
1042 indices.push_back(llvm::UndefValue::get(CGF.Int32Ty));
1044 indices.push_back(Builder.getInt32(Idx.getZExtValue()));
1047 Value *SV = llvm::ConstantVector::get(indices);
1048 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
1051 Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
1052 QualType SrcType = E->getSrcExpr()->getType(),
1053 DstType = E->getType();
1055 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
1057 SrcType = CGF.getContext().getCanonicalType(SrcType);
1058 DstType = CGF.getContext().getCanonicalType(DstType);
1059 if (SrcType == DstType) return Src;
1061 assert(SrcType->isVectorType() &&
1062 "ConvertVector source type must be a vector");
1063 assert(DstType->isVectorType() &&
1064 "ConvertVector destination type must be a vector");
1066 llvm::Type *SrcTy = Src->getType();
1067 llvm::Type *DstTy = ConvertType(DstType);
1069 // Ignore conversions like int -> uint.
1073 QualType SrcEltType = SrcType->getAs<VectorType>()->getElementType(),
1074 DstEltType = DstType->getAs<VectorType>()->getElementType();
1076 assert(SrcTy->isVectorTy() &&
1077 "ConvertVector source IR type must be a vector");
1078 assert(DstTy->isVectorTy() &&
1079 "ConvertVector destination IR type must be a vector");
1081 llvm::Type *SrcEltTy = SrcTy->getVectorElementType(),
1082 *DstEltTy = DstTy->getVectorElementType();
1084 if (DstEltType->isBooleanType()) {
1085 assert((SrcEltTy->isFloatingPointTy() ||
1086 isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
1088 llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
1089 if (SrcEltTy->isFloatingPointTy()) {
1090 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
1092 return Builder.CreateICmpNE(Src, Zero, "tobool");
1096 // We have the arithmetic types: real int/float.
1097 Value *Res = nullptr;
1099 if (isa<llvm::IntegerType>(SrcEltTy)) {
1100 bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
1101 if (isa<llvm::IntegerType>(DstEltTy))
1102 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
1103 else if (InputSigned)
1104 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
1106 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
1107 } else if (isa<llvm::IntegerType>(DstEltTy)) {
1108 assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
1109 if (DstEltType->isSignedIntegerOrEnumerationType())
1110 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
1112 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
1114 assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
1115 "Unknown real conversion");
1116 if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
1117 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
1119 Res = Builder.CreateFPExt(Src, DstTy, "conv");
1125 Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
1127 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
1129 CGF.EmitScalarExpr(E->getBase());
1131 EmitLValue(E->getBase());
1132 return Builder.getInt(Value);
1135 return EmitLoadOfLValue(E);
1138 Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
1139 TestAndClearIgnoreResultAssign();
1141 // Emit subscript expressions in rvalue context's. For most cases, this just
1142 // loads the lvalue formed by the subscript expr. However, we have to be
1143 // careful, because the base of a vector subscript is occasionally an rvalue,
1144 // so we can't get it as an lvalue.
1145 if (!E->getBase()->getType()->isVectorType())
1146 return EmitLoadOfLValue(E);
1148 // Handle the vector case. The base must be a vector, the index must be an
1150 Value *Base = Visit(E->getBase());
1151 Value *Idx = Visit(E->getIdx());
1152 QualType IdxTy = E->getIdx()->getType();
1154 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
1155 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
1157 return Builder.CreateExtractElement(Base, Idx, "vecext");
1160 static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
1161 unsigned Off, llvm::Type *I32Ty) {
1162 int MV = SVI->getMaskValue(Idx);
1164 return llvm::UndefValue::get(I32Ty);
1165 return llvm::ConstantInt::get(I32Ty, Off+MV);
1168 Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1169 bool Ignore = TestAndClearIgnoreResultAssign();
1171 assert (Ignore == false && "init list ignored");
1172 unsigned NumInitElements = E->getNumInits();
1174 if (E->hadArrayRangeDesignator())
1175 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1177 llvm::VectorType *VType =
1178 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1181 if (NumInitElements == 0) {
1182 // C++11 value-initialization for the scalar.
1183 return EmitNullValue(E->getType());
1185 // We have a scalar in braces. Just use the first element.
1186 return Visit(E->getInit(0));
1189 unsigned ResElts = VType->getNumElements();
1191 // Loop over initializers collecting the Value for each, and remembering
1192 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1193 // us to fold the shuffle for the swizzle into the shuffle for the vector
1194 // initializer, since LLVM optimizers generally do not want to touch
1196 unsigned CurIdx = 0;
1197 bool VIsUndefShuffle = false;
1198 llvm::Value *V = llvm::UndefValue::get(VType);
1199 for (unsigned i = 0; i != NumInitElements; ++i) {
1200 Expr *IE = E->getInit(i);
1201 Value *Init = Visit(IE);
1202 SmallVector<llvm::Constant*, 16> Args;
1204 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
1206 // Handle scalar elements. If the scalar initializer is actually one
1207 // element of a different vector of the same width, use shuffle instead of
1210 if (isa<ExtVectorElementExpr>(IE)) {
1211 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1213 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1214 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1215 Value *LHS = nullptr, *RHS = nullptr;
1217 // insert into undef -> shuffle (src, undef)
1219 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1221 LHS = EI->getVectorOperand();
1223 VIsUndefShuffle = true;
1224 } else if (VIsUndefShuffle) {
1225 // insert into undefshuffle && size match -> shuffle (v, src)
1226 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1227 for (unsigned j = 0; j != CurIdx; ++j)
1228 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
1229 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
1230 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1232 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1233 RHS = EI->getVectorOperand();
1234 VIsUndefShuffle = false;
1236 if (!Args.empty()) {
1237 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1238 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1244 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1246 VIsUndefShuffle = false;
1251 unsigned InitElts = VVT->getNumElements();
1253 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1254 // input is the same width as the vector being constructed, generate an
1255 // optimized shuffle of the swizzle input into the result.
1256 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
1257 if (isa<ExtVectorElementExpr>(IE)) {
1258 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1259 Value *SVOp = SVI->getOperand(0);
1260 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
1262 if (OpTy->getNumElements() == ResElts) {
1263 for (unsigned j = 0; j != CurIdx; ++j) {
1264 // If the current vector initializer is a shuffle with undef, merge
1265 // this shuffle directly into it.
1266 if (VIsUndefShuffle) {
1267 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
1270 Args.push_back(Builder.getInt32(j));
1273 for (unsigned j = 0, je = InitElts; j != je; ++j)
1274 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
1275 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1277 if (VIsUndefShuffle)
1278 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1284 // Extend init to result vector length, and then shuffle its contribution
1285 // to the vector initializer into V.
1287 for (unsigned j = 0; j != InitElts; ++j)
1288 Args.push_back(Builder.getInt32(j));
1289 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1290 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1291 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
1295 for (unsigned j = 0; j != CurIdx; ++j)
1296 Args.push_back(Builder.getInt32(j));
1297 for (unsigned j = 0; j != InitElts; ++j)
1298 Args.push_back(Builder.getInt32(j+Offset));
1299 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1302 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1303 // merging subsequent shuffles into this one.
1306 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
1307 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1308 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1312 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1313 // Emit remaining default initializers.
1314 llvm::Type *EltTy = VType->getElementType();
1316 // Emit remaining default initializers
1317 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
1318 Value *Idx = Builder.getInt32(CurIdx);
1319 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1320 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1325 static bool ShouldNullCheckClassCastValue(const CastExpr *CE) {
1326 const Expr *E = CE->getSubExpr();
1328 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
1331 if (isa<CXXThisExpr>(E)) {
1332 // We always assume that 'this' is never null.
1336 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
1337 // And that glvalue casts are never null.
1338 if (ICE->getValueKind() != VK_RValue)
1345 // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1346 // have to handle a more broad range of conversions than explicit casts, as they
1347 // handle things like function to ptr-to-function decay etc.
1348 Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
1349 Expr *E = CE->getSubExpr();
1350 QualType DestTy = CE->getType();
1351 CastKind Kind = CE->getCastKind();
1353 if (!DestTy->isVoidType())
1354 TestAndClearIgnoreResultAssign();
1356 // Since almost all cast kinds apply to scalars, this switch doesn't have
1357 // a default case, so the compiler will warn on a missing case. The cases
1358 // are in the same order as in the CastKind enum.
1360 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
1361 case CK_BuiltinFnToFnPtr:
1362 llvm_unreachable("builtin functions are handled elsewhere");
1364 case CK_LValueBitCast:
1365 case CK_ObjCObjectLValueCast: {
1366 Value *V = EmitLValue(E).getAddress();
1367 V = Builder.CreateBitCast(V,
1368 ConvertType(CGF.getContext().getPointerType(DestTy)));
1369 return EmitLoadOfLValue(CGF.MakeNaturalAlignAddrLValue(V, DestTy),
1373 case CK_CPointerToObjCPointerCast:
1374 case CK_BlockPointerToObjCPointerCast:
1375 case CK_AnyPointerToBlockPointerCast:
1377 Value *Src = Visit(const_cast<Expr*>(E));
1378 llvm::Type *SrcTy = Src->getType();
1379 llvm::Type *DstTy = ConvertType(DestTy);
1380 if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
1381 SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
1382 llvm_unreachable("wrong cast for pointers in different address spaces"
1383 "(must be an address space cast)!");
1386 if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
1387 if (auto PT = DestTy->getAs<PointerType>())
1388 CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src,
1389 /*MayBeNull=*/true);
1392 return Builder.CreateBitCast(Src, DstTy);
1394 case CK_AddressSpaceConversion: {
1395 Value *Src = Visit(const_cast<Expr*>(E));
1396 return Builder.CreateAddrSpaceCast(Src, ConvertType(DestTy));
1398 case CK_AtomicToNonAtomic:
1399 case CK_NonAtomicToAtomic:
1401 case CK_UserDefinedConversion:
1402 return Visit(const_cast<Expr*>(E));
1404 case CK_BaseToDerived: {
1405 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1406 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1408 llvm::Value *V = Visit(E);
1410 llvm::Value *Derived =
1411 CGF.GetAddressOfDerivedClass(V, DerivedClassDecl,
1412 CE->path_begin(), CE->path_end(),
1413 ShouldNullCheckClassCastValue(CE));
1415 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1416 // performed and the object is not of the derived type.
1417 if (CGF.sanitizePerformTypeCheck())
1418 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1419 Derived, DestTy->getPointeeType());
1421 if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
1422 CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(), Derived,
1423 /*MayBeNull=*/true);
1427 case CK_UncheckedDerivedToBase:
1428 case CK_DerivedToBase: {
1429 const CXXRecordDecl *DerivedClassDecl =
1430 E->getType()->getPointeeCXXRecordDecl();
1431 assert(DerivedClassDecl && "DerivedToBase arg isn't a C++ object pointer!");
1433 return CGF.GetAddressOfBaseClass(
1434 Visit(E), DerivedClassDecl, CE->path_begin(), CE->path_end(),
1435 ShouldNullCheckClassCastValue(CE), CE->getExprLoc());
1438 Value *V = Visit(const_cast<Expr*>(E));
1439 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1440 return CGF.EmitDynamicCast(V, DCE);
1443 case CK_ArrayToPointerDecay: {
1444 assert(E->getType()->isArrayType() &&
1445 "Array to pointer decay must have array source type!");
1447 Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays.
1449 // Note that VLA pointers are always decayed, so we don't need to do
1451 if (!E->getType()->isVariableArrayType()) {
1452 assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer");
1453 llvm::Type *NewTy = ConvertType(E->getType());
1454 V = CGF.Builder.CreatePointerCast(
1455 V, NewTy->getPointerTo(V->getType()->getPointerAddressSpace()));
1457 assert(isa<llvm::ArrayType>(V->getType()->getPointerElementType()) &&
1458 "Expected pointer to array");
1459 V = Builder.CreateStructGEP(NewTy, V, 0, "arraydecay");
1462 // Make sure the array decay ends up being the right type. This matters if
1463 // the array type was of an incomplete type.
1464 return CGF.Builder.CreatePointerCast(V, ConvertType(CE->getType()));
1466 case CK_FunctionToPointerDecay:
1467 return EmitLValue(E).getAddress();
1469 case CK_NullToPointer:
1470 if (MustVisitNullValue(E))
1473 return llvm::ConstantPointerNull::get(
1474 cast<llvm::PointerType>(ConvertType(DestTy)));
1476 case CK_NullToMemberPointer: {
1477 if (MustVisitNullValue(E))
1480 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1481 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1484 case CK_ReinterpretMemberPointer:
1485 case CK_BaseToDerivedMemberPointer:
1486 case CK_DerivedToBaseMemberPointer: {
1487 Value *Src = Visit(E);
1489 // Note that the AST doesn't distinguish between checked and
1490 // unchecked member pointer conversions, so we always have to
1491 // implement checked conversions here. This is inefficient when
1492 // actual control flow may be required in order to perform the
1493 // check, which it is for data member pointers (but not member
1494 // function pointers on Itanium and ARM).
1495 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
1498 case CK_ARCProduceObject:
1499 return CGF.EmitARCRetainScalarExpr(E);
1500 case CK_ARCConsumeObject:
1501 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
1502 case CK_ARCReclaimReturnedObject: {
1503 llvm::Value *value = Visit(E);
1504 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
1505 return CGF.EmitObjCConsumeObject(E->getType(), value);
1507 case CK_ARCExtendBlockObject:
1508 return CGF.EmitARCExtendBlockObject(E);
1510 case CK_CopyAndAutoreleaseBlockObject:
1511 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
1513 case CK_FloatingRealToComplex:
1514 case CK_FloatingComplexCast:
1515 case CK_IntegralRealToComplex:
1516 case CK_IntegralComplexCast:
1517 case CK_IntegralComplexToFloatingComplex:
1518 case CK_FloatingComplexToIntegralComplex:
1519 case CK_ConstructorConversion:
1521 llvm_unreachable("scalar cast to non-scalar value");
1523 case CK_LValueToRValue:
1524 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
1525 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
1526 return Visit(const_cast<Expr*>(E));
1528 case CK_IntegralToPointer: {
1529 Value *Src = Visit(const_cast<Expr*>(E));
1531 // First, convert to the correct width so that we control the kind of
1533 llvm::Type *MiddleTy = CGF.IntPtrTy;
1534 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
1535 llvm::Value* IntResult =
1536 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1538 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
1540 case CK_PointerToIntegral:
1541 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1542 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
1545 CGF.EmitIgnoredExpr(E);
1548 case CK_VectorSplat: {
1549 llvm::Type *DstTy = ConvertType(DestTy);
1550 Value *Elt = Visit(const_cast<Expr*>(E));
1551 Elt = EmitScalarConversion(Elt, E->getType(),
1552 DestTy->getAs<VectorType>()->getElementType());
1554 // Splat the element across to all elements
1555 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
1556 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
1559 case CK_IntegralCast:
1560 case CK_IntegralToFloating:
1561 case CK_FloatingToIntegral:
1562 case CK_FloatingCast:
1563 return EmitScalarConversion(Visit(E), E->getType(), DestTy);
1564 case CK_IntegralToBoolean:
1565 return EmitIntToBoolConversion(Visit(E));
1566 case CK_PointerToBoolean:
1567 return EmitPointerToBoolConversion(Visit(E));
1568 case CK_FloatingToBoolean:
1569 return EmitFloatToBoolConversion(Visit(E));
1570 case CK_MemberPointerToBoolean: {
1571 llvm::Value *MemPtr = Visit(E);
1572 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1573 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
1576 case CK_FloatingComplexToReal:
1577 case CK_IntegralComplexToReal:
1578 return CGF.EmitComplexExpr(E, false, true).first;
1580 case CK_FloatingComplexToBoolean:
1581 case CK_IntegralComplexToBoolean: {
1582 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
1584 // TODO: kill this function off, inline appropriate case here
1585 return EmitComplexToScalarConversion(V, E->getType(), DestTy);
1588 case CK_ZeroToOCLEvent: {
1589 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non-event type");
1590 return llvm::Constant::getNullValue(ConvertType(DestTy));
1595 llvm_unreachable("unknown scalar cast");
1598 Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
1599 CodeGenFunction::StmtExprEvaluation eval(CGF);
1600 llvm::Value *RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
1601 !E->getType()->isVoidType());
1604 return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
1608 //===----------------------------------------------------------------------===//
1610 //===----------------------------------------------------------------------===//
1612 static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
1613 llvm::Value *InVal, bool IsInc) {
1616 BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
1617 BinOp.Ty = E->getType();
1618 BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
1619 BinOp.FPContractable = false;
1624 llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
1625 const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
1626 llvm::Value *Amount =
1627 llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true);
1628 StringRef Name = IsInc ? "inc" : "dec";
1629 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
1630 case LangOptions::SOB_Defined:
1631 return Builder.CreateAdd(InVal, Amount, Name);
1632 case LangOptions::SOB_Undefined:
1633 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
1634 return Builder.CreateNSWAdd(InVal, Amount, Name);
1636 case LangOptions::SOB_Trapping:
1637 return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc));
1639 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
1643 ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1644 bool isInc, bool isPre) {
1646 QualType type = E->getSubExpr()->getType();
1647 llvm::PHINode *atomicPHI = nullptr;
1651 int amount = (isInc ? 1 : -1);
1653 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1654 type = atomicTy->getValueType();
1655 if (isInc && type->isBooleanType()) {
1656 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1658 Builder.Insert(new llvm::StoreInst(True,
1659 LV.getAddress(), LV.isVolatileQualified(),
1660 LV.getAlignment().getQuantity(),
1661 llvm::SequentiallyConsistent));
1662 return Builder.getTrue();
1664 // For atomic bool increment, we just store true and return it for
1665 // preincrement, do an atomic swap with true for postincrement
1666 return Builder.CreateAtomicRMW(llvm::AtomicRMWInst::Xchg,
1667 LV.getAddress(), True, llvm::SequentiallyConsistent);
1669 // Special case for atomic increment / decrement on integers, emit
1670 // atomicrmw instructions. We skip this if we want to be doing overflow
1671 // checking, and fall into the slow path with the atomic cmpxchg loop.
1672 if (!type->isBooleanType() && type->isIntegerType() &&
1673 !(type->isUnsignedIntegerType() &&
1674 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
1675 CGF.getLangOpts().getSignedOverflowBehavior() !=
1676 LangOptions::SOB_Trapping) {
1677 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1678 llvm::AtomicRMWInst::Sub;
1679 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1680 llvm::Instruction::Sub;
1681 llvm::Value *amt = CGF.EmitToMemory(
1682 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1683 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1684 LV.getAddress(), amt, llvm::SequentiallyConsistent);
1685 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1687 value = EmitLoadOfLValue(LV, E->getExprLoc());
1689 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
1690 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1691 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1692 value = CGF.EmitToMemory(value, type);
1693 Builder.CreateBr(opBB);
1694 Builder.SetInsertPoint(opBB);
1695 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1696 atomicPHI->addIncoming(value, startBB);
1699 value = EmitLoadOfLValue(LV, E->getExprLoc());
1703 // Special case of integer increment that we have to check first: bool++.
1704 // Due to promotion rules, we get:
1705 // bool++ -> bool = bool + 1
1706 // -> bool = (int)bool + 1
1707 // -> bool = ((int)bool + 1 != 0)
1708 // An interesting aspect of this is that increment is always true.
1709 // Decrement does not have this property.
1710 if (isInc && type->isBooleanType()) {
1711 value = Builder.getTrue();
1713 // Most common case by far: integer increment.
1714 } else if (type->isIntegerType()) {
1715 // Note that signed integer inc/dec with width less than int can't
1716 // overflow because of promotion rules; we're just eliding a few steps here.
1717 bool CanOverflow = value->getType()->getIntegerBitWidth() >=
1718 CGF.IntTy->getIntegerBitWidth();
1719 if (CanOverflow && type->isSignedIntegerOrEnumerationType()) {
1720 value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
1721 } else if (CanOverflow && type->isUnsignedIntegerType() &&
1722 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
1724 EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc));
1726 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
1727 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1730 // Next most common: pointer increment.
1731 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1732 QualType type = ptr->getPointeeType();
1734 // VLA types don't have constant size.
1735 if (const VariableArrayType *vla
1736 = CGF.getContext().getAsVariableArrayType(type)) {
1737 llvm::Value *numElts = CGF.getVLASize(vla).first;
1738 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
1739 if (CGF.getLangOpts().isSignedOverflowDefined())
1740 value = Builder.CreateGEP(value, numElts, "vla.inc");
1742 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
1744 // Arithmetic on function pointers (!) is just +-1.
1745 } else if (type->isFunctionType()) {
1746 llvm::Value *amt = Builder.getInt32(amount);
1748 value = CGF.EmitCastToVoidPtr(value);
1749 if (CGF.getLangOpts().isSignedOverflowDefined())
1750 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1752 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
1753 value = Builder.CreateBitCast(value, input->getType());
1755 // For everything else, we can just do a simple increment.
1757 llvm::Value *amt = Builder.getInt32(amount);
1758 if (CGF.getLangOpts().isSignedOverflowDefined())
1759 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1761 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
1764 // Vector increment/decrement.
1765 } else if (type->isVectorType()) {
1766 if (type->hasIntegerRepresentation()) {
1767 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1769 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1771 value = Builder.CreateFAdd(
1773 llvm::ConstantFP::get(value->getType(), amount),
1774 isInc ? "inc" : "dec");
1778 } else if (type->isRealFloatingType()) {
1779 // Add the inc/dec to the real part.
1782 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1783 // Another special case: half FP increment should be done via float
1784 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1785 value = Builder.CreateCall(
1786 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16,
1788 input, "incdec.conv");
1790 value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv");
1794 if (value->getType()->isFloatTy())
1795 amt = llvm::ConstantFP::get(VMContext,
1796 llvm::APFloat(static_cast<float>(amount)));
1797 else if (value->getType()->isDoubleTy())
1798 amt = llvm::ConstantFP::get(VMContext,
1799 llvm::APFloat(static_cast<double>(amount)));
1801 // Remaining types are either Half or LongDouble. Convert from float.
1802 llvm::APFloat F(static_cast<float>(amount));
1804 // Don't use getFloatTypeSemantics because Half isn't
1805 // necessarily represented using the "half" LLVM type.
1806 F.convert(value->getType()->isHalfTy()
1807 ? CGF.getTarget().getHalfFormat()
1808 : CGF.getTarget().getLongDoubleFormat(),
1809 llvm::APFloat::rmTowardZero, &ignored);
1810 amt = llvm::ConstantFP::get(VMContext, F);
1812 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1814 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
1815 if (!CGF.getContext().getLangOpts().HalfArgsAndReturns) {
1816 value = Builder.CreateCall(
1817 CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16,
1819 value, "incdec.conv");
1821 value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv");
1825 // Objective-C pointer types.
1827 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1828 value = CGF.EmitCastToVoidPtr(value);
1830 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1831 if (!isInc) size = -size;
1832 llvm::Value *sizeValue =
1833 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1835 if (CGF.getLangOpts().isSignedOverflowDefined())
1836 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1838 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
1839 value = Builder.CreateBitCast(value, input->getType());
1843 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1844 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1845 auto Pair = CGF.EmitAtomicCompareExchange(
1846 LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
1847 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
1848 llvm::Value *success = Pair.second;
1849 atomicPHI->addIncoming(old, opBB);
1850 Builder.CreateCondBr(success, contBB, opBB);
1851 Builder.SetInsertPoint(contBB);
1852 return isPre ? value : input;
1855 // Store the updated result through the lvalue.
1856 if (LV.isBitField())
1857 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
1859 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
1861 // If this is a postinc, return the value read from memory, otherwise use the
1863 return isPre ? value : input;
1868 Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
1869 TestAndClearIgnoreResultAssign();
1870 // Emit unary minus with EmitSub so we handle overflow cases etc.
1872 BinOp.RHS = Visit(E->getSubExpr());
1874 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1875 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1877 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
1878 BinOp.Ty = E->getType();
1879 BinOp.Opcode = BO_Sub;
1880 BinOp.FPContractable = false;
1882 return EmitSub(BinOp);
1885 Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
1886 TestAndClearIgnoreResultAssign();
1887 Value *Op = Visit(E->getSubExpr());
1888 return Builder.CreateNot(Op, "neg");
1891 Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1892 // Perform vector logical not on comparison with zero vector.
1893 if (E->getType()->isExtVectorType()) {
1894 Value *Oper = Visit(E->getSubExpr());
1895 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1897 if (Oper->getType()->isFPOrFPVectorTy())
1898 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1900 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1901 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1904 // Compare operand to zero.
1905 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
1908 // TODO: Could dynamically modify easy computations here. For example, if
1909 // the operand is an icmp ne, turn into icmp eq.
1910 BoolVal = Builder.CreateNot(BoolVal, "lnot");
1912 // ZExt result to the expr type.
1913 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
1916 Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1917 // Try folding the offsetof to a constant.
1919 if (E->EvaluateAsInt(Value, CGF.getContext()))
1920 return Builder.getInt(Value);
1922 // Loop over the components of the offsetof to compute the value.
1923 unsigned n = E->getNumComponents();
1924 llvm::Type* ResultType = ConvertType(E->getType());
1925 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1926 QualType CurrentType = E->getTypeSourceInfo()->getType();
1927 for (unsigned i = 0; i != n; ++i) {
1928 OffsetOfExpr::OffsetOfNode ON = E->getComponent(i);
1929 llvm::Value *Offset = nullptr;
1930 switch (ON.getKind()) {
1931 case OffsetOfExpr::OffsetOfNode::Array: {
1932 // Compute the index
1933 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1934 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1935 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
1936 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1938 // Save the element type
1940 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1942 // Compute the element size
1943 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1944 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1946 // Multiply out to compute the result
1947 Offset = Builder.CreateMul(Idx, ElemSize);
1951 case OffsetOfExpr::OffsetOfNode::Field: {
1952 FieldDecl *MemberDecl = ON.getField();
1953 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1954 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1956 // Compute the index of the field in its parent.
1958 // FIXME: It would be nice if we didn't have to loop here!
1959 for (RecordDecl::field_iterator Field = RD->field_begin(),
1960 FieldEnd = RD->field_end();
1961 Field != FieldEnd; ++Field, ++i) {
1962 if (*Field == MemberDecl)
1965 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1967 // Compute the offset to the field
1968 int64_t OffsetInt = RL.getFieldOffset(i) /
1969 CGF.getContext().getCharWidth();
1970 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1972 // Save the element type.
1973 CurrentType = MemberDecl->getType();
1977 case OffsetOfExpr::OffsetOfNode::Identifier:
1978 llvm_unreachable("dependent __builtin_offsetof");
1980 case OffsetOfExpr::OffsetOfNode::Base: {
1981 if (ON.getBase()->isVirtual()) {
1982 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1986 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1987 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1989 // Save the element type.
1990 CurrentType = ON.getBase()->getType();
1992 // Compute the offset to the base.
1993 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1994 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
1995 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
1996 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
2000 Result = Builder.CreateAdd(Result, Offset);
2005 /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
2006 /// argument of the sizeof expression as an integer.
2008 ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
2009 const UnaryExprOrTypeTraitExpr *E) {
2010 QualType TypeToSize = E->getTypeOfArgument();
2011 if (E->getKind() == UETT_SizeOf) {
2012 if (const VariableArrayType *VAT =
2013 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
2014 if (E->isArgumentType()) {
2015 // sizeof(type) - make sure to emit the VLA size.
2016 CGF.EmitVariablyModifiedType(TypeToSize);
2018 // C99 6.5.3.4p2: If the argument is an expression of type
2019 // VLA, it is evaluated.
2020 CGF.EmitIgnoredExpr(E->getArgumentExpr());
2024 llvm::Value *numElts;
2025 std::tie(numElts, eltType) = CGF.getVLASize(VAT);
2027 llvm::Value *size = numElts;
2029 // Scale the number of non-VLA elements by the non-VLA element size.
2030 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
2031 if (!eltSize.isOne())
2032 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
2038 // If this isn't sizeof(vla), the result must be constant; use the constant
2039 // folding logic so we don't have to duplicate it here.
2040 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
2043 Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
2044 Expr *Op = E->getSubExpr();
2045 if (Op->getType()->isAnyComplexType()) {
2046 // If it's an l-value, load through the appropriate subobject l-value.
2047 // Note that we have to ask E because Op might be an l-value that
2048 // this won't work for, e.g. an Obj-C property.
2050 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2051 E->getExprLoc()).getScalarVal();
2053 // Otherwise, calculate and project.
2054 return CGF.EmitComplexExpr(Op, false, true).first;
2060 Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
2061 Expr *Op = E->getSubExpr();
2062 if (Op->getType()->isAnyComplexType()) {
2063 // If it's an l-value, load through the appropriate subobject l-value.
2064 // Note that we have to ask E because Op might be an l-value that
2065 // this won't work for, e.g. an Obj-C property.
2066 if (Op->isGLValue())
2067 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E),
2068 E->getExprLoc()).getScalarVal();
2070 // Otherwise, calculate and project.
2071 return CGF.EmitComplexExpr(Op, true, false).second;
2074 // __imag on a scalar returns zero. Emit the subexpr to ensure side
2075 // effects are evaluated, but not the actual value.
2076 if (Op->isGLValue())
2079 CGF.EmitScalarExpr(Op, true);
2080 return llvm::Constant::getNullValue(ConvertType(E->getType()));
2083 //===----------------------------------------------------------------------===//
2085 //===----------------------------------------------------------------------===//
2087 BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
2088 TestAndClearIgnoreResultAssign();
2090 Result.LHS = Visit(E->getLHS());
2091 Result.RHS = Visit(E->getRHS());
2092 Result.Ty = E->getType();
2093 Result.Opcode = E->getOpcode();
2094 Result.FPContractable = E->isFPContractable();
2099 LValue ScalarExprEmitter::EmitCompoundAssignLValue(
2100 const CompoundAssignOperator *E,
2101 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
2103 QualType LHSTy = E->getLHS()->getType();
2106 if (E->getComputationResultType()->isAnyComplexType())
2107 return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
2109 // Emit the RHS first. __block variables need to have the rhs evaluated
2110 // first, plus this should improve codegen a little.
2111 OpInfo.RHS = Visit(E->getRHS());
2112 OpInfo.Ty = E->getComputationResultType();
2113 OpInfo.Opcode = E->getOpcode();
2114 OpInfo.FPContractable = false;
2116 // Load/convert the LHS.
2117 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2119 llvm::PHINode *atomicPHI = nullptr;
2120 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
2121 QualType type = atomicTy->getValueType();
2122 if (!type->isBooleanType() && type->isIntegerType() &&
2123 !(type->isUnsignedIntegerType() &&
2124 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
2125 CGF.getLangOpts().getSignedOverflowBehavior() !=
2126 LangOptions::SOB_Trapping) {
2127 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
2128 switch (OpInfo.Opcode) {
2129 // We don't have atomicrmw operands for *, %, /, <<, >>
2130 case BO_MulAssign: case BO_DivAssign:
2136 aop = llvm::AtomicRMWInst::Add;
2139 aop = llvm::AtomicRMWInst::Sub;
2142 aop = llvm::AtomicRMWInst::And;
2145 aop = llvm::AtomicRMWInst::Xor;
2148 aop = llvm::AtomicRMWInst::Or;
2151 llvm_unreachable("Invalid compound assignment type");
2153 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
2154 llvm::Value *amt = CGF.EmitToMemory(EmitScalarConversion(OpInfo.RHS,
2155 E->getRHS()->getType(), LHSTy), LHSTy);
2156 Builder.CreateAtomicRMW(aop, LHSLV.getAddress(), amt,
2157 llvm::SequentiallyConsistent);
2161 // FIXME: For floating point types, we should be saving and restoring the
2162 // floating point environment in the loop.
2163 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
2164 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
2165 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2166 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
2167 Builder.CreateBr(opBB);
2168 Builder.SetInsertPoint(opBB);
2169 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
2170 atomicPHI->addIncoming(OpInfo.LHS, startBB);
2171 OpInfo.LHS = atomicPHI;
2174 OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
2176 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
2177 E->getComputationLHSType());
2179 // Expand the binary operator.
2180 Result = (this->*Func)(OpInfo);
2182 // Convert the result back to the LHS type.
2183 Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy);
2186 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
2187 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
2188 auto Pair = CGF.EmitAtomicCompareExchange(
2189 LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
2190 llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
2191 llvm::Value *success = Pair.second;
2192 atomicPHI->addIncoming(old, opBB);
2193 Builder.CreateCondBr(success, contBB, opBB);
2194 Builder.SetInsertPoint(contBB);
2198 // Store the result value into the LHS lvalue. Bit-fields are handled
2199 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
2200 // 'An assignment expression has the value of the left operand after the
2202 if (LHSLV.isBitField())
2203 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
2205 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
2210 Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2211 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2212 bool Ignore = TestAndClearIgnoreResultAssign();
2214 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2216 // If the result is clearly ignored, return now.
2220 // The result of an assignment in C is the assigned r-value.
2221 if (!CGF.getLangOpts().CPlusPlus)
2224 // If the lvalue is non-volatile, return the computed value of the assignment.
2225 if (!LHS.isVolatileQualified())
2228 // Otherwise, reload the value.
2229 return EmitLoadOfLValue(LHS, E->getExprLoc());
2232 void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
2233 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
2234 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks;
2236 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2237 Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
2238 SanitizerKind::IntegerDivideByZero));
2241 if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
2242 Ops.Ty->hasSignedIntegerRepresentation()) {
2243 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2245 llvm::Value *IntMin =
2246 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
2247 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2249 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2250 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
2251 llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2253 std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow));
2256 if (Checks.size() > 0)
2257 EmitBinOpCheck(Checks, Ops);
2260 Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
2262 CodeGenFunction::SanitizerScope SanScope(&CGF);
2263 if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
2264 CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
2265 Ops.Ty->isIntegerType()) {
2266 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2267 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
2268 } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
2269 Ops.Ty->isRealFloatingType()) {
2270 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2271 llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
2272 EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero),
2277 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2278 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
2279 if (CGF.getLangOpts().OpenCL) {
2280 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
2281 llvm::Type *ValTy = Val->getType();
2282 if (ValTy->isFloatTy() ||
2283 (isa<llvm::VectorType>(ValTy) &&
2284 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
2285 CGF.SetFPAccuracy(Val, 2.5);
2289 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
2290 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2292 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2295 Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2296 // Rem in C can't be a floating point type: C99 6.5.5p2.
2297 if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
2298 CodeGenFunction::SanitizerScope SanScope(&CGF);
2299 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2301 if (Ops.Ty->isIntegerType())
2302 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2305 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2306 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2308 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2311 Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2315 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
2316 switch (Ops.Opcode) {
2320 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2321 llvm::Intrinsic::uadd_with_overflow;
2326 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2327 llvm::Intrinsic::usub_with_overflow;
2332 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2333 llvm::Intrinsic::umul_with_overflow;
2336 llvm_unreachable("Unsupported operation for overflow detection");
2342 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
2344 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
2346 Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
2347 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2348 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2350 // Handle overflow with llvm.trap if no custom handler has been specified.
2351 const std::string *handlerName =
2352 &CGF.getLangOpts().OverflowHandler;
2353 if (handlerName->empty()) {
2354 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
2355 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
2356 if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
2357 CodeGenFunction::SanitizerScope SanScope(&CGF);
2358 llvm::Value *NotOverflow = Builder.CreateNot(overflow);
2359 SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow
2360 : SanitizerKind::UnsignedIntegerOverflow;
2361 EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops);
2363 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
2367 // Branch in case of overflow.
2368 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
2369 llvm::Function::iterator insertPt = initialBB;
2370 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2371 std::next(insertPt));
2372 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
2374 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2376 // If an overflow handler is set, then we want to call it and then use its
2377 // result, if it returns.
2378 Builder.SetInsertPoint(overflowBB);
2380 // Get the overflow handler.
2381 llvm::Type *Int8Ty = CGF.Int8Ty;
2382 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
2383 llvm::FunctionType *handlerTy =
2384 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2385 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2387 // Sign extend the args to 64-bit, so that we can use the same handler for
2388 // all types of overflow.
2389 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2390 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2392 // Call the handler with the two arguments, the operation, and the size of
2394 llvm::Value *handlerArgs[] = {
2397 Builder.getInt8(OpID),
2398 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2400 llvm::Value *handlerResult =
2401 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
2403 // Truncate the result back to the desired size.
2404 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2405 Builder.CreateBr(continueBB);
2407 Builder.SetInsertPoint(continueBB);
2408 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
2409 phi->addIncoming(result, initialBB);
2410 phi->addIncoming(handlerResult, overflowBB);
2415 /// Emit pointer + index arithmetic.
2416 static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2417 const BinOpInfo &op,
2418 bool isSubtraction) {
2419 // Must have binary (not unary) expr here. Unary pointer
2420 // increment/decrement doesn't use this path.
2421 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2423 Value *pointer = op.LHS;
2424 Expr *pointerOperand = expr->getLHS();
2425 Value *index = op.RHS;
2426 Expr *indexOperand = expr->getRHS();
2428 // In a subtraction, the LHS is always the pointer.
2429 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2430 std::swap(pointer, index);
2431 std::swap(pointerOperand, indexOperand);
2434 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2435 if (width != CGF.PointerWidthInBits) {
2436 // Zero-extend or sign-extend the pointer value according to
2437 // whether the index is signed or not.
2438 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2439 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2443 // If this is subtraction, negate the index.
2445 index = CGF.Builder.CreateNeg(index, "idx.neg");
2447 if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
2448 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2449 /*Accessed*/ false);
2451 const PointerType *pointerType
2452 = pointerOperand->getType()->getAs<PointerType>();
2454 QualType objectType = pointerOperand->getType()
2455 ->castAs<ObjCObjectPointerType>()
2457 llvm::Value *objectSize
2458 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2460 index = CGF.Builder.CreateMul(index, objectSize);
2462 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2463 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2464 return CGF.Builder.CreateBitCast(result, pointer->getType());
2467 QualType elementType = pointerType->getPointeeType();
2468 if (const VariableArrayType *vla
2469 = CGF.getContext().getAsVariableArrayType(elementType)) {
2470 // The element count here is the total number of non-VLA elements.
2471 llvm::Value *numElements = CGF.getVLASize(vla).first;
2473 // Effectively, the multiply by the VLA size is part of the GEP.
2474 // GEP indexes are signed, and scaling an index isn't permitted to
2475 // signed-overflow, so we use the same semantics for our explicit
2476 // multiply. We suppress this if overflow is not undefined behavior.
2477 if (CGF.getLangOpts().isSignedOverflowDefined()) {
2478 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2479 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2481 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2482 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2487 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2488 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2490 if (elementType->isVoidType() || elementType->isFunctionType()) {
2491 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2492 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2493 return CGF.Builder.CreateBitCast(result, pointer->getType());
2496 if (CGF.getLangOpts().isSignedOverflowDefined())
2497 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2499 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
2502 // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2503 // Addend. Use negMul and negAdd to negate the first operand of the Mul or
2504 // the add operand respectively. This allows fmuladd to represent a*b-c, or
2505 // c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2506 // efficient operations.
2507 static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2508 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2509 bool negMul, bool negAdd) {
2510 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2512 Value *MulOp0 = MulOp->getOperand(0);
2513 Value *MulOp1 = MulOp->getOperand(1);
2517 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2519 } else if (negAdd) {
2522 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2526 Value *FMulAdd = Builder.CreateCall(
2527 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2528 {MulOp0, MulOp1, Addend});
2529 MulOp->eraseFromParent();
2534 // Check whether it would be legal to emit an fmuladd intrinsic call to
2535 // represent op and if so, build the fmuladd.
2537 // Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2538 // Does NOT check the type of the operation - it's assumed that this function
2539 // will be called from contexts where it's known that the type is contractable.
2540 static Value* tryEmitFMulAdd(const BinOpInfo &op,
2541 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2544 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2545 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2546 "Only fadd/fsub can be the root of an fmuladd.");
2548 // Check whether this op is marked as fusable.
2549 if (!op.FPContractable)
2552 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2553 // either disabled, or handled entirely by the LLVM backend).
2554 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
2557 // We have a potentially fusable op. Look for a mul on one of the operands.
2558 if (llvm::BinaryOperator* LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2559 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul) {
2560 assert(LHSBinOp->getNumUses() == 0 &&
2561 "Operations with multiple uses shouldn't be contracted.");
2562 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2564 } else if (llvm::BinaryOperator* RHSBinOp =
2565 dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2566 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul) {
2567 assert(RHSBinOp->getNumUses() == 0 &&
2568 "Operations with multiple uses shouldn't be contracted.");
2569 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2576 Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2577 if (op.LHS->getType()->isPointerTy() ||
2578 op.RHS->getType()->isPointerTy())
2579 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2581 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2582 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2583 case LangOptions::SOB_Defined:
2584 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2585 case LangOptions::SOB_Undefined:
2586 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2587 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2589 case LangOptions::SOB_Trapping:
2590 return EmitOverflowCheckedBinOp(op);
2594 if (op.Ty->isUnsignedIntegerType() &&
2595 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2596 return EmitOverflowCheckedBinOp(op);
2598 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2599 // Try to form an fmuladd.
2600 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2603 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
2606 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2609 Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2610 // The LHS is always a pointer if either side is.
2611 if (!op.LHS->getType()->isPointerTy()) {
2612 if (op.Ty->isSignedIntegerOrEnumerationType()) {
2613 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
2614 case LangOptions::SOB_Defined:
2615 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2616 case LangOptions::SOB_Undefined:
2617 if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
2618 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2620 case LangOptions::SOB_Trapping:
2621 return EmitOverflowCheckedBinOp(op);
2625 if (op.Ty->isUnsignedIntegerType() &&
2626 CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow))
2627 return EmitOverflowCheckedBinOp(op);
2629 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2630 // Try to form an fmuladd.
2631 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2633 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
2636 return Builder.CreateSub(op.LHS, op.RHS, "sub");
2639 // If the RHS is not a pointer, then we have normal pointer
2641 if (!op.RHS->getType()->isPointerTy())
2642 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
2644 // Otherwise, this is a pointer subtraction.
2646 // Do the raw subtraction part.
2648 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2650 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2651 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
2653 // Okay, figure out the element size.
2654 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2655 QualType elementType = expr->getLHS()->getType()->getPointeeType();
2657 llvm::Value *divisor = nullptr;
2659 // For a variable-length array, this is going to be non-constant.
2660 if (const VariableArrayType *vla
2661 = CGF.getContext().getAsVariableArrayType(elementType)) {
2662 llvm::Value *numElements;
2663 std::tie(numElements, elementType) = CGF.getVLASize(vla);
2665 divisor = numElements;
2667 // Scale the number of non-VLA elements by the non-VLA element size.
2668 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2669 if (!eltSize.isOne())
2670 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2672 // For everything elese, we can just compute it, safe in the
2673 // assumption that Sema won't let anything through that we can't
2674 // safely compute the size of.
2676 CharUnits elementSize;
2677 // Handle GCC extension for pointer arithmetic on void* and
2678 // function pointer types.
2679 if (elementType->isVoidType() || elementType->isFunctionType())
2680 elementSize = CharUnits::One();
2682 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2684 // Don't even emit the divide for element size of 1.
2685 if (elementSize.isOne())
2688 divisor = CGF.CGM.getSize(elementSize);
2691 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2692 // pointer difference in C is only defined in the case where both operands
2693 // are pointing to elements of an array.
2694 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
2697 Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
2698 llvm::IntegerType *Ty;
2699 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2700 Ty = cast<llvm::IntegerType>(VT->getElementType());
2702 Ty = cast<llvm::IntegerType>(LHS->getType());
2703 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
2706 Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2707 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2708 // RHS to the same size as the LHS.
2709 Value *RHS = Ops.RHS;
2710 if (Ops.LHS->getType() != RHS->getType())
2711 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2713 bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
2714 Ops.Ty->hasSignedIntegerRepresentation();
2715 bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
2716 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2717 if (CGF.getLangOpts().OpenCL)
2719 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
2720 else if ((SanitizeBase || SanitizeExponent) &&
2721 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2722 CodeGenFunction::SanitizerScope SanScope(&CGF);
2723 SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks;
2724 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
2725 llvm::Value *ValidExponent = Builder.CreateICmpULE(RHS, WidthMinusOne);
2727 if (SanitizeExponent) {
2729 std::make_pair(ValidExponent, SanitizerKind::ShiftExponent));
2733 // Check whether we are shifting any non-zero bits off the top of the
2734 // integer. We only emit this check if exponent is valid - otherwise
2735 // instructions below will have undefined behavior themselves.
2736 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2737 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2738 llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
2739 Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
2740 CGF.EmitBlock(CheckShiftBase);
2741 llvm::Value *BitsShiftedOff =
2742 Builder.CreateLShr(Ops.LHS,
2743 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2744 /*NUW*/true, /*NSW*/true),
2746 if (CGF.getLangOpts().CPlusPlus) {
2747 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2748 // Under C++11's rules, shifting a 1 bit into the sign bit is
2749 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2750 // define signed left shifts, so we use the C99 and C++11 rules there).
2751 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2752 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2754 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
2755 llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2756 CGF.EmitBlock(Cont);
2757 llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
2758 BaseCheck->addIncoming(Builder.getTrue(), Orig);
2759 BaseCheck->addIncoming(ValidBase, CheckShiftBase);
2760 Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase));
2763 assert(!Checks.empty());
2764 EmitBinOpCheck(Checks, Ops);
2767 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2770 Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2771 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2772 // RHS to the same size as the LHS.
2773 Value *RHS = Ops.RHS;
2774 if (Ops.LHS->getType() != RHS->getType())
2775 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
2777 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2778 if (CGF.getLangOpts().OpenCL)
2780 Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
2781 else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
2782 isa<llvm::IntegerType>(Ops.LHS->getType())) {
2783 CodeGenFunction::SanitizerScope SanScope(&CGF);
2784 llvm::Value *Valid =
2785 Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS));
2786 EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops);
2789 if (Ops.Ty->hasUnsignedIntegerRepresentation())
2790 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2791 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2794 enum IntrinsicType { VCMPEQ, VCMPGT };
2795 // return corresponding comparison intrinsic for given vector type
2796 static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2797 BuiltinType::Kind ElemKind) {
2799 default: llvm_unreachable("unexpected element type");
2800 case BuiltinType::Char_U:
2801 case BuiltinType::UChar:
2802 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2803 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
2804 case BuiltinType::Char_S:
2805 case BuiltinType::SChar:
2806 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2807 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
2808 case BuiltinType::UShort:
2809 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2810 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
2811 case BuiltinType::Short:
2812 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2813 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
2814 case BuiltinType::UInt:
2815 case BuiltinType::ULong:
2816 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2817 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
2818 case BuiltinType::Int:
2819 case BuiltinType::Long:
2820 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2821 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
2822 case BuiltinType::Float:
2823 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2824 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
2828 Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc,
2829 unsigned SICmpOpc, unsigned FCmpOpc) {
2830 TestAndClearIgnoreResultAssign();
2832 QualType LHSTy = E->getLHS()->getType();
2833 QualType RHSTy = E->getRHS()->getType();
2834 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
2835 assert(E->getOpcode() == BO_EQ ||
2836 E->getOpcode() == BO_NE);
2837 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2838 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
2839 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
2840 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
2841 } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
2842 Value *LHS = Visit(E->getLHS());
2843 Value *RHS = Visit(E->getRHS());
2845 // If AltiVec, the comparison results in a numeric type, so we use
2846 // intrinsics comparing vectors and giving 0 or 1 as a result
2847 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
2848 // constants for mapping CR6 register bits to predicate result
2849 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2851 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2853 // in several cases vector arguments order will be reversed
2854 Value *FirstVecArg = LHS,
2855 *SecondVecArg = RHS;
2857 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
2858 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
2859 BuiltinType::Kind ElementKind = BTy->getKind();
2861 switch(E->getOpcode()) {
2862 default: llvm_unreachable("is not a comparison operation");
2865 ID = GetIntrinsic(VCMPEQ, ElementKind);
2869 ID = GetIntrinsic(VCMPEQ, ElementKind);
2873 ID = GetIntrinsic(VCMPGT, ElementKind);
2874 std::swap(FirstVecArg, SecondVecArg);
2878 ID = GetIntrinsic(VCMPGT, ElementKind);
2881 if (ElementKind == BuiltinType::Float) {
2883 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2884 std::swap(FirstVecArg, SecondVecArg);
2888 ID = GetIntrinsic(VCMPGT, ElementKind);
2892 if (ElementKind == BuiltinType::Float) {
2894 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2898 ID = GetIntrinsic(VCMPGT, ElementKind);
2899 std::swap(FirstVecArg, SecondVecArg);
2904 Value *CR6Param = Builder.getInt32(CR6);
2905 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2906 Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
2907 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2910 if (LHS->getType()->isFPOrFPVectorTy()) {
2911 Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc,
2913 } else if (LHSTy->hasSignedIntegerRepresentation()) {
2914 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc,
2917 // Unsigned integers and pointers.
2918 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2922 // If this is a vector comparison, sign extend the result to the appropriate
2923 // vector integer type and return it (don't convert to bool).
2924 if (LHSTy->isVectorType())
2925 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
2928 // Complex Comparison: can only be an equality comparison.
2929 CodeGenFunction::ComplexPairTy LHS, RHS;
2931 if (auto *CTy = LHSTy->getAs<ComplexType>()) {
2932 LHS = CGF.EmitComplexExpr(E->getLHS());
2933 CETy = CTy->getElementType();
2935 LHS.first = Visit(E->getLHS());
2936 LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
2939 if (auto *CTy = RHSTy->getAs<ComplexType>()) {
2940 RHS = CGF.EmitComplexExpr(E->getRHS());
2941 assert(CGF.getContext().hasSameUnqualifiedType(CETy,
2942 CTy->getElementType()) &&
2943 "The element types must always match.");
2946 RHS.first = Visit(E->getRHS());
2947 RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
2948 assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
2949 "The element types must always match.");
2952 Value *ResultR, *ResultI;
2953 if (CETy->isRealFloatingType()) {
2954 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2955 LHS.first, RHS.first, "cmp.r");
2956 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2957 LHS.second, RHS.second, "cmp.i");
2959 // Complex comparisons can only be equality comparisons. As such, signed
2960 // and unsigned opcodes are the same.
2961 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2962 LHS.first, RHS.first, "cmp.r");
2963 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2964 LHS.second, RHS.second, "cmp.i");
2967 if (E->getOpcode() == BO_EQ) {
2968 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2970 assert(E->getOpcode() == BO_NE &&
2971 "Complex comparison other than == or != ?");
2972 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2976 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2979 Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
2980 bool Ignore = TestAndClearIgnoreResultAssign();
2985 switch (E->getLHS()->getType().getObjCLifetime()) {
2986 case Qualifiers::OCL_Strong:
2987 std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
2990 case Qualifiers::OCL_Autoreleasing:
2991 std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
2994 case Qualifiers::OCL_Weak:
2995 RHS = Visit(E->getRHS());
2996 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
2997 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
3000 // No reason to do any of these differently.
3001 case Qualifiers::OCL_None:
3002 case Qualifiers::OCL_ExplicitNone:
3003 // __block variables need to have the rhs evaluated first, plus
3004 // this should improve codegen just a little.
3005 RHS = Visit(E->getRHS());
3006 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
3008 // Store the value into the LHS. Bit-fields are handled specially
3009 // because the result is altered by the store, i.e., [C99 6.5.16p1]
3010 // 'An assignment expression has the value of the left operand after
3011 // the assignment...'.
3012 if (LHS.isBitField())
3013 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
3015 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
3018 // If the result is clearly ignored, return now.
3022 // The result of an assignment in C is the assigned r-value.
3023 if (!CGF.getLangOpts().CPlusPlus)
3026 // If the lvalue is non-volatile, return the computed value of the assignment.
3027 if (!LHS.isVolatileQualified())
3030 // Otherwise, reload the value.
3031 return EmitLoadOfLValue(LHS, E->getExprLoc());
3034 Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
3035 // Perform vector logical and on comparisons with zero vectors.
3036 if (E->getType()->isVectorType()) {
3037 CGF.incrementProfileCounter(E);
3039 Value *LHS = Visit(E->getLHS());
3040 Value *RHS = Visit(E->getRHS());
3041 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3042 if (LHS->getType()->isFPOrFPVectorTy()) {
3043 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3044 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3046 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3047 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3049 Value *And = Builder.CreateAnd(LHS, RHS);
3050 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
3053 llvm::Type *ResTy = ConvertType(E->getType());
3055 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
3056 // If we have 1 && X, just emit X without inserting the control flow.
3058 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3059 if (LHSCondVal) { // If we have 1 && X, just emit X.
3060 CGF.incrementProfileCounter(E);
3062 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3063 // ZExt result to int or bool.
3064 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
3067 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
3068 if (!CGF.ContainsLabel(E->getRHS()))
3069 return llvm::Constant::getNullValue(ResTy);
3072 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
3073 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
3075 CodeGenFunction::ConditionalEvaluation eval(CGF);
3077 // Branch on the LHS first. If it is false, go to the failure (cont) block.
3078 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock,
3079 CGF.getProfileCount(E->getRHS()));
3081 // Any edges into the ContBlock are now from an (indeterminate number of)
3082 // edges from this first condition. All of these values will be false. Start
3083 // setting up the PHI node in the Cont Block for this.
3084 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3086 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3088 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
3091 CGF.EmitBlock(RHSBlock);
3092 CGF.incrementProfileCounter(E);
3093 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3096 // Reaquire the RHS block, as there may be subblocks inserted.
3097 RHSBlock = Builder.GetInsertBlock();
3099 // Emit an unconditional branch from this block to ContBlock.
3101 // There is no need to emit line number for unconditional branch.
3102 auto NL = ApplyDebugLocation::CreateEmpty(CGF);
3103 CGF.EmitBlock(ContBlock);
3105 // Insert an entry into the phi node for the edge with the value of RHSCond.
3106 PN->addIncoming(RHSCond, RHSBlock);
3108 // ZExt result to int.
3109 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
3112 Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
3113 // Perform vector logical or on comparisons with zero vectors.
3114 if (E->getType()->isVectorType()) {
3115 CGF.incrementProfileCounter(E);
3117 Value *LHS = Visit(E->getLHS());
3118 Value *RHS = Visit(E->getRHS());
3119 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
3120 if (LHS->getType()->isFPOrFPVectorTy()) {
3121 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
3122 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
3124 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
3125 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
3127 Value *Or = Builder.CreateOr(LHS, RHS);
3128 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
3131 llvm::Type *ResTy = ConvertType(E->getType());
3133 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
3134 // If we have 0 || X, just emit X without inserting the control flow.
3136 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
3137 if (!LHSCondVal) { // If we have 0 || X, just emit X.
3138 CGF.incrementProfileCounter(E);
3140 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3141 // ZExt result to int or bool.
3142 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
3145 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
3146 if (!CGF.ContainsLabel(E->getRHS()))
3147 return llvm::ConstantInt::get(ResTy, 1);
3150 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
3151 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
3153 CodeGenFunction::ConditionalEvaluation eval(CGF);
3155 // Branch on the LHS first. If it is true, go to the success (cont) block.
3156 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock,
3157 CGF.getCurrentProfileCount() -
3158 CGF.getProfileCount(E->getRHS()));
3160 // Any edges into the ContBlock are now from an (indeterminate number of)
3161 // edges from this first condition. All of these values will be true. Start
3162 // setting up the PHI node in the Cont Block for this.
3163 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
3165 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
3167 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
3171 // Emit the RHS condition as a bool value.
3172 CGF.EmitBlock(RHSBlock);
3173 CGF.incrementProfileCounter(E);
3174 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
3178 // Reaquire the RHS block, as there may be subblocks inserted.
3179 RHSBlock = Builder.GetInsertBlock();
3181 // Emit an unconditional branch from this block to ContBlock. Insert an entry
3182 // into the phi node for the edge with the value of RHSCond.
3183 CGF.EmitBlock(ContBlock);
3184 PN->addIncoming(RHSCond, RHSBlock);
3186 // ZExt result to int.
3187 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
3190 Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
3191 CGF.EmitIgnoredExpr(E->getLHS());
3192 CGF.EnsureInsertPoint();
3193 return Visit(E->getRHS());
3196 //===----------------------------------------------------------------------===//
3198 //===----------------------------------------------------------------------===//
3200 /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
3201 /// expression is cheap enough and side-effect-free enough to evaluate
3202 /// unconditionally instead of conditionally. This is used to convert control
3203 /// flow into selects in some cases.
3204 static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
3205 CodeGenFunction &CGF) {
3206 // Anything that is an integer or floating point constant is fine.
3207 return E->IgnoreParens()->isEvaluatable(CGF.getContext());
3209 // Even non-volatile automatic variables can't be evaluated unconditionally.
3210 // Referencing a thread_local may cause non-trivial initialization work to
3211 // occur. If we're inside a lambda and one of the variables is from the scope
3212 // outside the lambda, that function may have returned already. Reading its
3213 // locals is a bad idea. Also, these reads may introduce races there didn't
3214 // exist in the source-level program.
3218 Value *ScalarExprEmitter::
3219 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
3220 TestAndClearIgnoreResultAssign();
3222 // Bind the common expression if necessary.
3223 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
3225 Expr *condExpr = E->getCond();
3226 Expr *lhsExpr = E->getTrueExpr();
3227 Expr *rhsExpr = E->getFalseExpr();
3229 // If the condition constant folds and can be elided, try to avoid emitting
3230 // the condition and the dead arm.
3232 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
3233 Expr *live = lhsExpr, *dead = rhsExpr;
3234 if (!CondExprBool) std::swap(live, dead);
3236 // If the dead side doesn't have labels we need, just emit the Live part.
3237 if (!CGF.ContainsLabel(dead)) {
3239 CGF.incrementProfileCounter(E);
3240 Value *Result = Visit(live);
3242 // If the live part is a throw expression, it acts like it has a void
3243 // type, so evaluating it returns a null Value*. However, a conditional
3244 // with non-void type must return a non-null Value*.
3245 if (!Result && !E->getType()->isVoidType())
3246 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
3252 // OpenCL: If the condition is a vector, we can treat this condition like
3253 // the select function.
3254 if (CGF.getLangOpts().OpenCL
3255 && condExpr->getType()->isVectorType()) {
3256 CGF.incrementProfileCounter(E);
3258 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
3259 llvm::Value *LHS = Visit(lhsExpr);
3260 llvm::Value *RHS = Visit(rhsExpr);
3262 llvm::Type *condType = ConvertType(condExpr->getType());
3263 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
3265 unsigned numElem = vecTy->getNumElements();
3266 llvm::Type *elemType = vecTy->getElementType();
3268 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
3269 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3270 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3271 llvm::VectorType::get(elemType,
3274 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3276 // Cast float to int to perform ANDs if necessary.
3277 llvm::Value *RHSTmp = RHS;
3278 llvm::Value *LHSTmp = LHS;
3279 bool wasCast = false;
3280 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
3281 if (rhsVTy->getElementType()->isFloatingPointTy()) {
3282 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3283 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3287 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3288 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3289 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3291 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3296 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3297 // select instead of as control flow. We can only do this if it is cheap and
3298 // safe to evaluate the LHS and RHS unconditionally.
3299 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3300 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3301 CGF.incrementProfileCounter(E);
3303 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3304 llvm::Value *LHS = Visit(lhsExpr);
3305 llvm::Value *RHS = Visit(rhsExpr);
3307 // If the conditional has void type, make sure we return a null Value*.
3308 assert(!RHS && "LHS and RHS types must match");
3311 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3314 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3315 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
3316 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
3318 CodeGenFunction::ConditionalEvaluation eval(CGF);
3319 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
3320 CGF.getProfileCount(lhsExpr));
3322 CGF.EmitBlock(LHSBlock);
3323 CGF.incrementProfileCounter(E);
3325 Value *LHS = Visit(lhsExpr);
3328 LHSBlock = Builder.GetInsertBlock();
3329 Builder.CreateBr(ContBlock);
3331 CGF.EmitBlock(RHSBlock);
3333 Value *RHS = Visit(rhsExpr);
3336 RHSBlock = Builder.GetInsertBlock();
3337 CGF.EmitBlock(ContBlock);
3339 // If the LHS or RHS is a throw expression, it will be legitimately null.
3345 // Create a PHI node for the real part.
3346 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
3347 PN->addIncoming(LHS, LHSBlock);
3348 PN->addIncoming(RHS, RHSBlock);
3352 Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
3353 return Visit(E->getChosenSubExpr());
3356 Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
3357 QualType Ty = VE->getType();
3359 if (Ty->isVariablyModifiedType())
3360 CGF.EmitVariablyModifiedType(Ty);
3362 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
3363 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
3364 llvm::Type *ArgTy = ConvertType(VE->getType());
3366 // If EmitVAArg fails, we fall back to the LLVM instruction.
3368 return Builder.CreateVAArg(ArgValue, ArgTy);
3370 // FIXME Volatility.
3371 llvm::Value *Val = Builder.CreateLoad(ArgPtr);
3373 // If EmitVAArg promoted the type, we must truncate it.
3374 if (ArgTy != Val->getType()) {
3375 if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy())
3376 Val = Builder.CreateIntToPtr(Val, ArgTy);
3378 Val = Builder.CreateTrunc(Val, ArgTy);
3384 Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3385 return CGF.EmitBlockLiteral(block);
3388 Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3389 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
3390 llvm::Type *DstTy = ConvertType(E->getType());
3392 // Going from vec4->vec3 or vec3->vec4 is a special case and requires
3393 // a shuffle vector instead of a bitcast.
3394 llvm::Type *SrcTy = Src->getType();
3395 if (isa<llvm::VectorType>(DstTy) && isa<llvm::VectorType>(SrcTy)) {
3396 unsigned numElementsDst = cast<llvm::VectorType>(DstTy)->getNumElements();
3397 unsigned numElementsSrc = cast<llvm::VectorType>(SrcTy)->getNumElements();
3398 if ((numElementsDst == 3 && numElementsSrc == 4)
3399 || (numElementsDst == 4 && numElementsSrc == 3)) {
3402 // In the case of going from int4->float3, a bitcast is needed before
3404 llvm::Type *srcElemTy =
3405 cast<llvm::VectorType>(SrcTy)->getElementType();
3406 llvm::Type *dstElemTy =
3407 cast<llvm::VectorType>(DstTy)->getElementType();
3409 if ((srcElemTy->isIntegerTy() && dstElemTy->isFloatTy())
3410 || (srcElemTy->isFloatTy() && dstElemTy->isIntegerTy())) {
3411 // Create a float type of the same size as the source or destination.
3412 llvm::VectorType *newSrcTy = llvm::VectorType::get(dstElemTy,
3415 Src = Builder.CreateBitCast(Src, newSrcTy, "astypeCast");
3418 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3420 SmallVector<llvm::Constant*, 3> Args;
3421 Args.push_back(Builder.getInt32(0));
3422 Args.push_back(Builder.getInt32(1));
3423 Args.push_back(Builder.getInt32(2));
3425 if (numElementsDst == 4)
3426 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
3428 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3430 return Builder.CreateShuffleVector(Src, UnV, Mask, "astype");
3434 return Builder.CreateBitCast(Src, DstTy, "astype");
3437 Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3438 return CGF.EmitAtomicExpr(E).getScalarVal();
3441 //===----------------------------------------------------------------------===//
3442 // Entry Point into this File
3443 //===----------------------------------------------------------------------===//
3445 /// EmitScalarExpr - Emit the computation of the specified expression of scalar
3446 /// type, ignoring the result.
3447 Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
3448 assert(E && hasScalarEvaluationKind(E->getType()) &&
3449 "Invalid scalar expression to emit");
3451 return ScalarExprEmitter(*this, IgnoreResultAssign)
3452 .Visit(const_cast<Expr *>(E));
3455 /// EmitScalarConversion - Emit a conversion from the specified type to the
3456 /// specified destination type, both of which are LLVM scalar types.
3457 Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3459 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
3460 "Invalid scalar expression to emit");
3461 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy);
3464 /// EmitComplexToScalarConversion - Emit a conversion from the specified complex
3465 /// type to the specified destination type, where the destination type is an
3466 /// LLVM scalar type.
3467 Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3470 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
3471 "Invalid complex -> scalar conversion");
3472 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy,
3477 llvm::Value *CodeGenFunction::
3478 EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3479 bool isInc, bool isPre) {
3480 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3483 LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3485 // object->isa or (*object).isa
3486 // Generate code as for: *(Class*)object
3487 // build Class* type
3488 llvm::Type *ClassPtrTy = ConvertType(E->getType());
3490 Expr *BaseExpr = E->getBase();
3491 if (BaseExpr->isRValue()) {
3492 V = CreateMemTemp(E->getType(), "resval");
3493 llvm::Value *Src = EmitScalarExpr(BaseExpr);
3494 Builder.CreateStore(Src, V);
3495 V = ScalarExprEmitter(*this).EmitLoadOfLValue(
3496 MakeNaturalAlignAddrLValue(V, E->getType()), E->getExprLoc());
3499 V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr);
3501 V = EmitLValue(BaseExpr).getAddress();
3504 // build Class* type
3505 ClassPtrTy = ClassPtrTy->getPointerTo();
3506 V = Builder.CreateBitCast(V, ClassPtrTy);
3507 return MakeNaturalAlignAddrLValue(V, E->getType());
3511 LValue CodeGenFunction::EmitCompoundAssignmentLValue(
3512 const CompoundAssignOperator *E) {
3513 ScalarExprEmitter Scalar(*this);
3514 Value *Result = nullptr;
3515 switch (E->getOpcode()) {
3516 #define COMPOUND_OP(Op) \
3517 case BO_##Op##Assign: \
3518 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
3554 llvm_unreachable("Not valid compound assignment operators");
3557 llvm_unreachable("Unhandled compound assignment operator");