1 //===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
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 as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
17 #include "CGDebugInfo.h"
18 #include "CGObjCRuntime.h"
19 #include "CGRecordLayout.h"
20 #include "CodeGenModule.h"
21 #include "TargetInfo.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/Frontend/CodeGenOptions.h"
25 #include "llvm/ADT/Hashing.h"
26 #include "llvm/IR/DataLayout.h"
27 #include "llvm/IR/Intrinsics.h"
28 #include "llvm/IR/LLVMContext.h"
29 #include "llvm/IR/MDBuilder.h"
30 #include "llvm/Support/ConvertUTF.h"
32 using namespace clang;
33 using namespace CodeGen;
35 //===--------------------------------------------------------------------===//
36 // Miscellaneous Helper Methods
37 //===--------------------------------------------------------------------===//
39 llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
40 unsigned addressSpace =
41 cast<llvm::PointerType>(value->getType())->getAddressSpace();
43 llvm::PointerType *destType = Int8PtrTy;
45 destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
47 if (value->getType() == destType) return value;
48 return Builder.CreateBitCast(value, destType);
51 /// CreateTempAlloca - This creates a alloca and inserts it into the entry
53 llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
55 if (!Builder.isNamePreserving())
56 return new llvm::AllocaInst(Ty, 0, "", AllocaInsertPt);
57 return new llvm::AllocaInst(Ty, 0, Name, AllocaInsertPt);
60 void CodeGenFunction::InitTempAlloca(llvm::AllocaInst *Var,
62 llvm::StoreInst *Store = new llvm::StoreInst(Init, Var);
63 llvm::BasicBlock *Block = AllocaInsertPt->getParent();
64 Block->getInstList().insertAfter(&*AllocaInsertPt, Store);
67 llvm::AllocaInst *CodeGenFunction::CreateIRTemp(QualType Ty,
69 llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertType(Ty), Name);
70 // FIXME: Should we prefer the preferred type alignment here?
71 CharUnits Align = getContext().getTypeAlignInChars(Ty);
72 Alloc->setAlignment(Align.getQuantity());
76 llvm::AllocaInst *CodeGenFunction::CreateMemTemp(QualType Ty,
78 llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), Name);
79 // FIXME: Should we prefer the preferred type alignment here?
80 CharUnits Align = getContext().getTypeAlignInChars(Ty);
81 Alloc->setAlignment(Align.getQuantity());
85 /// EvaluateExprAsBool - Perform the usual unary conversions on the specified
86 /// expression and compare the result against zero, returning an Int1Ty value.
87 llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
88 if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
89 llvm::Value *MemPtr = EmitScalarExpr(E);
90 return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
93 QualType BoolTy = getContext().BoolTy;
94 if (!E->getType()->isAnyComplexType())
95 return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy);
97 return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(),BoolTy);
100 /// EmitIgnoredExpr - Emit code to compute the specified expression,
101 /// ignoring the result.
102 void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
104 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
106 // Just emit it as an l-value and drop the result.
110 /// EmitAnyExpr - Emit code to compute the specified expression which
111 /// can have any type. The result is returned as an RValue struct.
112 /// If this is an aggregate expression, AggSlot indicates where the
113 /// result should be returned.
114 RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
115 AggValueSlot aggSlot,
117 switch (getEvaluationKind(E->getType())) {
119 return RValue::get(EmitScalarExpr(E, ignoreResult));
121 return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
123 if (!ignoreResult && aggSlot.isIgnored())
124 aggSlot = CreateAggTemp(E->getType(), "agg-temp");
125 EmitAggExpr(E, aggSlot);
126 return aggSlot.asRValue();
128 llvm_unreachable("bad evaluation kind");
131 /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will
132 /// always be accessible even if no aggregate location is provided.
133 RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
134 AggValueSlot AggSlot = AggValueSlot::ignored();
136 if (hasAggregateEvaluationKind(E->getType()))
137 AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
138 return EmitAnyExpr(E, AggSlot);
141 /// EmitAnyExprToMem - Evaluate an expression into a given memory
143 void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
144 llvm::Value *Location,
147 // FIXME: This function should take an LValue as an argument.
148 switch (getEvaluationKind(E->getType())) {
150 EmitComplexExprIntoLValue(E,
151 MakeNaturalAlignAddrLValue(Location, E->getType()),
155 case TEK_Aggregate: {
156 CharUnits Alignment = getContext().getTypeAlignInChars(E->getType());
157 EmitAggExpr(E, AggValueSlot::forAddr(Location, Alignment, Quals,
158 AggValueSlot::IsDestructed_t(IsInit),
159 AggValueSlot::DoesNotNeedGCBarriers,
160 AggValueSlot::IsAliased_t(!IsInit)));
165 RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
166 LValue LV = MakeAddrLValue(Location, E->getType());
167 EmitStoreThroughLValue(RV, LV);
171 llvm_unreachable("bad evaluation kind");
175 CreateReferenceTemporary(CodeGenFunction &CGF, QualType Type,
176 const NamedDecl *InitializedDecl) {
177 if (const VarDecl *VD = dyn_cast_or_null<VarDecl>(InitializedDecl)) {
178 if (VD->hasGlobalStorage()) {
179 SmallString<256> Name;
180 llvm::raw_svector_ostream Out(Name);
181 CGF.CGM.getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Out);
184 llvm::Type *RefTempTy = CGF.ConvertTypeForMem(Type);
186 // Create the reference temporary.
187 llvm::GlobalVariable *RefTemp =
188 new llvm::GlobalVariable(CGF.CGM.getModule(),
189 RefTempTy, /*isConstant=*/false,
190 llvm::GlobalValue::InternalLinkage,
191 llvm::Constant::getNullValue(RefTempTy),
193 // If we're binding to a thread_local variable, the temporary is also
195 if (VD->getTLSKind())
196 CGF.CGM.setTLSMode(RefTemp, *VD);
201 return CGF.CreateMemTemp(Type, "ref.tmp");
205 EmitExprForReferenceBinding(CodeGenFunction &CGF, const Expr *E,
206 llvm::Value *&ReferenceTemporary,
207 const CXXDestructorDecl *&ReferenceTemporaryDtor,
208 const InitListExpr *&ReferenceInitializerList,
209 QualType &ObjCARCReferenceLifetimeType,
210 const NamedDecl *InitializedDecl) {
211 const MaterializeTemporaryExpr *M = NULL;
212 E = E->findMaterializedTemporary(M);
213 // Objective-C++ ARC:
214 // If we are binding a reference to a temporary that has ownership, we
215 // need to perform retain/release operations on the temporary.
216 if (M && CGF.getLangOpts().ObjCAutoRefCount &&
217 M->getType()->isObjCLifetimeType() &&
218 (M->getType().getObjCLifetime() == Qualifiers::OCL_Strong ||
219 M->getType().getObjCLifetime() == Qualifiers::OCL_Weak ||
220 M->getType().getObjCLifetime() == Qualifiers::OCL_Autoreleasing))
221 ObjCARCReferenceLifetimeType = M->getType();
223 if (const ExprWithCleanups *EWC = dyn_cast<ExprWithCleanups>(E)) {
224 CGF.enterFullExpression(EWC);
225 CodeGenFunction::RunCleanupsScope Scope(CGF);
227 return EmitExprForReferenceBinding(CGF, EWC->getSubExpr(),
229 ReferenceTemporaryDtor,
230 ReferenceInitializerList,
231 ObjCARCReferenceLifetimeType,
235 if (E->isGLValue()) {
236 // Emit the expression as an lvalue.
237 LValue LV = CGF.EmitLValue(E);
238 assert(LV.isSimple());
239 return LV.getAddress();
242 if (!ObjCARCReferenceLifetimeType.isNull()) {
243 ReferenceTemporary = CreateReferenceTemporary(CGF,
244 ObjCARCReferenceLifetimeType,
248 LValue RefTempDst = CGF.MakeAddrLValue(ReferenceTemporary,
249 ObjCARCReferenceLifetimeType);
251 CGF.EmitScalarInit(E, dyn_cast_or_null<ValueDecl>(InitializedDecl),
254 bool ExtendsLifeOfTemporary = false;
255 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(InitializedDecl)) {
256 if (Var->extendsLifetimeOfTemporary())
257 ExtendsLifeOfTemporary = true;
258 } else if (InitializedDecl && isa<FieldDecl>(InitializedDecl)) {
259 ExtendsLifeOfTemporary = true;
262 if (!ExtendsLifeOfTemporary) {
263 // Since the lifetime of this temporary isn't going to be extended,
264 // we need to clean it up ourselves at the end of the full expression.
265 switch (ObjCARCReferenceLifetimeType.getObjCLifetime()) {
266 case Qualifiers::OCL_None:
267 case Qualifiers::OCL_ExplicitNone:
268 case Qualifiers::OCL_Autoreleasing:
271 case Qualifiers::OCL_Strong: {
272 assert(!ObjCARCReferenceLifetimeType->isArrayType());
273 CleanupKind cleanupKind = CGF.getARCCleanupKind();
274 CGF.pushDestroy(cleanupKind,
276 ObjCARCReferenceLifetimeType,
277 CodeGenFunction::destroyARCStrongImprecise,
278 cleanupKind & EHCleanup);
282 case Qualifiers::OCL_Weak:
283 assert(!ObjCARCReferenceLifetimeType->isArrayType());
284 CGF.pushDestroy(NormalAndEHCleanup,
286 ObjCARCReferenceLifetimeType,
287 CodeGenFunction::destroyARCWeak,
288 /*useEHCleanupForArray*/ true);
292 ObjCARCReferenceLifetimeType = QualType();
295 return ReferenceTemporary;
298 SmallVector<SubobjectAdjustment, 2> Adjustments;
299 E = E->skipRValueSubobjectAdjustments(Adjustments);
300 if (const OpaqueValueExpr *opaque = dyn_cast<OpaqueValueExpr>(E))
301 if (opaque->getType()->isRecordType())
302 return CGF.EmitOpaqueValueLValue(opaque).getAddress();
304 // Create a reference temporary if necessary.
305 AggValueSlot AggSlot = AggValueSlot::ignored();
306 if (CGF.hasAggregateEvaluationKind(E->getType())) {
307 ReferenceTemporary = CreateReferenceTemporary(CGF, E->getType(),
309 CharUnits Alignment = CGF.getContext().getTypeAlignInChars(E->getType());
310 AggValueSlot::IsDestructed_t isDestructed
311 = AggValueSlot::IsDestructed_t(InitializedDecl != 0);
312 AggSlot = AggValueSlot::forAddr(ReferenceTemporary, Alignment,
313 Qualifiers(), isDestructed,
314 AggValueSlot::DoesNotNeedGCBarriers,
315 AggValueSlot::IsNotAliased);
318 if (InitializedDecl) {
319 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(E)) {
320 if (ILE->initializesStdInitializerList()) {
321 ReferenceInitializerList = ILE;
324 else if (const RecordType *RT =
325 E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()){
326 // Get the destructor for the reference temporary.
327 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
328 if (!ClassDecl->hasTrivialDestructor())
329 ReferenceTemporaryDtor = ClassDecl->getDestructor();
333 RValue RV = CGF.EmitAnyExpr(E, AggSlot);
335 // Check if need to perform derived-to-base casts and/or field accesses, to
336 // get from the temporary object we created (and, potentially, for which we
337 // extended the lifetime) to the subobject we're binding the reference to.
338 if (!Adjustments.empty()) {
339 llvm::Value *Object = RV.getAggregateAddr();
340 for (unsigned I = Adjustments.size(); I != 0; --I) {
341 SubobjectAdjustment &Adjustment = Adjustments[I-1];
342 switch (Adjustment.Kind) {
343 case SubobjectAdjustment::DerivedToBaseAdjustment:
345 CGF.GetAddressOfBaseClass(Object,
346 Adjustment.DerivedToBase.DerivedClass,
347 Adjustment.DerivedToBase.BasePath->path_begin(),
348 Adjustment.DerivedToBase.BasePath->path_end(),
349 /*NullCheckValue=*/false);
352 case SubobjectAdjustment::FieldAdjustment: {
353 LValue LV = CGF.MakeAddrLValue(Object, E->getType());
354 LV = CGF.EmitLValueForField(LV, Adjustment.Field);
356 Object = LV.getAddress();
360 // For non-simple lvalues, we actually have to create a copy of
361 // the object we're binding to.
362 QualType T = Adjustment.Field->getType().getNonReferenceType()
363 .getUnqualifiedType();
364 Object = CreateReferenceTemporary(CGF, T, InitializedDecl);
365 LValue TempLV = CGF.MakeAddrLValue(Object,
366 Adjustment.Field->getType());
367 CGF.EmitStoreThroughLValue(CGF.EmitLoadOfLValue(LV), TempLV);
371 case SubobjectAdjustment::MemberPointerAdjustment: {
372 llvm::Value *Ptr = CGF.EmitScalarExpr(Adjustment.Ptr.RHS);
373 Object = CGF.CGM.getCXXABI().EmitMemberDataPointerAddress(
374 CGF, Object, Ptr, Adjustment.Ptr.MPT);
383 if (RV.isAggregate())
384 return RV.getAggregateAddr();
386 // Create a temporary variable that we can bind the reference to.
387 ReferenceTemporary = CreateReferenceTemporary(CGF, E->getType(),
391 LValue tempLV = CGF.MakeNaturalAlignAddrLValue(ReferenceTemporary,
394 CGF.EmitStoreOfScalar(RV.getScalarVal(), tempLV, /*init*/ true);
396 CGF.EmitStoreOfComplex(RV.getComplexVal(), tempLV, /*init*/ true);
397 return ReferenceTemporary;
401 CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E,
402 const NamedDecl *InitializedDecl) {
403 llvm::Value *ReferenceTemporary = 0;
404 const CXXDestructorDecl *ReferenceTemporaryDtor = 0;
405 const InitListExpr *ReferenceInitializerList = 0;
406 QualType ObjCARCReferenceLifetimeType;
407 llvm::Value *Value = EmitExprForReferenceBinding(*this, E, ReferenceTemporary,
408 ReferenceTemporaryDtor,
409 ReferenceInitializerList,
410 ObjCARCReferenceLifetimeType,
412 if (SanitizePerformTypeCheck && !E->getType()->isFunctionType()) {
413 // C++11 [dcl.ref]p5 (as amended by core issue 453):
414 // If a glvalue to which a reference is directly bound designates neither
415 // an existing object or function of an appropriate type nor a region of
416 // storage of suitable size and alignment to contain an object of the
417 // reference's type, the behavior is undefined.
418 QualType Ty = E->getType();
419 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
421 if (!ReferenceTemporaryDtor && !ReferenceInitializerList &&
422 ObjCARCReferenceLifetimeType.isNull())
423 return RValue::get(Value);
425 // Make sure to call the destructor for the reference temporary.
426 const VarDecl *VD = dyn_cast_or_null<VarDecl>(InitializedDecl);
427 if (VD && VD->hasGlobalStorage()) {
428 if (ReferenceTemporaryDtor) {
429 llvm::Constant *CleanupFn;
430 llvm::Constant *CleanupArg;
431 if (E->getType()->isArrayType()) {
432 CleanupFn = CodeGenFunction(CGM).generateDestroyHelper(
433 cast<llvm::Constant>(ReferenceTemporary), E->getType(),
434 destroyCXXObject, getLangOpts().Exceptions);
435 CleanupArg = llvm::Constant::getNullValue(Int8PtrTy);
438 CGM.GetAddrOfCXXDestructor(ReferenceTemporaryDtor, Dtor_Complete);
439 CleanupArg = cast<llvm::Constant>(ReferenceTemporary);
441 CGM.getCXXABI().registerGlobalDtor(*this, *VD, CleanupFn, CleanupArg);
442 } else if (ReferenceInitializerList) {
443 // FIXME: This is wrong. We need to register a global destructor to clean
444 // up the initializer_list object, rather than adding it as a local
446 EmitStdInitializerListCleanup(ReferenceTemporary,
447 ReferenceInitializerList);
449 assert(!ObjCARCReferenceLifetimeType.isNull() && !VD->getTLSKind());
450 // Note: We intentionally do not register a global "destructor" to
451 // release the object.
454 return RValue::get(Value);
457 if (ReferenceTemporaryDtor) {
458 if (E->getType()->isArrayType())
459 pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
460 destroyCXXObject, getLangOpts().Exceptions);
462 PushDestructorCleanup(ReferenceTemporaryDtor, ReferenceTemporary);
463 } else if (ReferenceInitializerList) {
464 EmitStdInitializerListCleanup(ReferenceTemporary,
465 ReferenceInitializerList);
467 switch (ObjCARCReferenceLifetimeType.getObjCLifetime()) {
468 case Qualifiers::OCL_None:
470 "Not a reference temporary that needs to be deallocated");
471 case Qualifiers::OCL_ExplicitNone:
472 case Qualifiers::OCL_Autoreleasing:
476 case Qualifiers::OCL_Strong: {
477 bool precise = VD && VD->hasAttr<ObjCPreciseLifetimeAttr>();
478 CleanupKind cleanupKind = getARCCleanupKind();
479 pushDestroy(cleanupKind, ReferenceTemporary, ObjCARCReferenceLifetimeType,
480 precise ? destroyARCStrongPrecise : destroyARCStrongImprecise,
481 cleanupKind & EHCleanup);
485 case Qualifiers::OCL_Weak: {
486 // __weak objects always get EH cleanups; otherwise, exceptions
487 // could cause really nasty crashes instead of mere leaks.
488 pushDestroy(NormalAndEHCleanup, ReferenceTemporary,
489 ObjCARCReferenceLifetimeType, destroyARCWeak, true);
495 return RValue::get(Value);
499 /// getAccessedFieldNo - Given an encoded value and a result number, return the
500 /// input field number being accessed.
501 unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
502 const llvm::Constant *Elts) {
503 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
507 /// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
508 static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
510 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
511 llvm::Value *K47 = Builder.getInt64(47);
512 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
513 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
514 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
515 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
516 return Builder.CreateMul(B1, KMul);
519 void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
520 llvm::Value *Address,
521 QualType Ty, CharUnits Alignment) {
522 if (!SanitizePerformTypeCheck)
525 // Don't check pointers outside the default address space. The null check
526 // isn't correct, the object-size check isn't supported by LLVM, and we can't
527 // communicate the addresses to the runtime handler for the vptr check.
528 if (Address->getType()->getPointerAddressSpace())
531 llvm::Value *Cond = 0;
532 llvm::BasicBlock *Done = 0;
535 // The glvalue must not be an empty glvalue.
536 Cond = Builder.CreateICmpNE(
537 Address, llvm::Constant::getNullValue(Address->getType()));
539 if (TCK == TCK_DowncastPointer) {
540 // When performing a pointer downcast, it's OK if the value is null.
541 // Skip the remaining checks in that case.
542 Done = createBasicBlock("null");
543 llvm::BasicBlock *Rest = createBasicBlock("not.null");
544 Builder.CreateCondBr(Cond, Rest, Done);
550 if (SanOpts->ObjectSize && !Ty->isIncompleteType()) {
551 uint64_t Size = getContext().getTypeSizeInChars(Ty).getQuantity();
553 // The glvalue must refer to a large enough storage region.
554 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
556 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, IntPtrTy);
557 llvm::Value *Min = Builder.getFalse();
558 llvm::Value *CastAddr = Builder.CreateBitCast(Address, Int8PtrTy);
559 llvm::Value *LargeEnough =
560 Builder.CreateICmpUGE(Builder.CreateCall2(F, CastAddr, Min),
561 llvm::ConstantInt::get(IntPtrTy, Size));
562 Cond = Cond ? Builder.CreateAnd(Cond, LargeEnough) : LargeEnough;
565 uint64_t AlignVal = 0;
567 if (SanOpts->Alignment) {
568 AlignVal = Alignment.getQuantity();
569 if (!Ty->isIncompleteType() && !AlignVal)
570 AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
572 // The glvalue must be suitably aligned.
575 Builder.CreateAnd(Builder.CreatePtrToInt(Address, IntPtrTy),
576 llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
577 llvm::Value *Aligned =
578 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
579 Cond = Cond ? Builder.CreateAnd(Cond, Aligned) : Aligned;
584 llvm::Constant *StaticData[] = {
585 EmitCheckSourceLocation(Loc),
586 EmitCheckTypeDescriptor(Ty),
587 llvm::ConstantInt::get(SizeTy, AlignVal),
588 llvm::ConstantInt::get(Int8Ty, TCK)
590 EmitCheck(Cond, "type_mismatch", StaticData, Address, CRK_Recoverable);
593 // If possible, check that the vptr indicates that there is a subobject of
594 // type Ty at offset zero within this object.
596 // C++11 [basic.life]p5,6:
597 // [For storage which does not refer to an object within its lifetime]
598 // The program has undefined behavior if:
599 // -- the [pointer or glvalue] is used to access a non-static data member
600 // or call a non-static member function
601 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
603 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
604 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference) &&
605 RD && RD->hasDefinition() && RD->isDynamicClass()) {
606 // Compute a hash of the mangled name of the type.
608 // FIXME: This is not guaranteed to be deterministic! Move to a
609 // fingerprinting mechanism once LLVM provides one. For the time
610 // being the implementation happens to be deterministic.
611 SmallString<64> MangledName;
612 llvm::raw_svector_ostream Out(MangledName);
613 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
615 llvm::hash_code TypeHash = hash_value(Out.str());
617 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
618 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
619 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
620 llvm::Value *VPtrAddr = Builder.CreateBitCast(Address, VPtrTy);
621 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
622 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
624 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
625 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
627 // Look the hash up in our cache.
628 const int CacheSize = 128;
629 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
630 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
631 "__ubsan_vptr_type_cache");
632 llvm::Value *Slot = Builder.CreateAnd(Hash,
633 llvm::ConstantInt::get(IntPtrTy,
635 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
636 llvm::Value *CacheVal =
637 Builder.CreateLoad(Builder.CreateInBoundsGEP(Cache, Indices));
639 // If the hash isn't in the cache, call a runtime handler to perform the
640 // hard work of checking whether the vptr is for an object of the right
641 // type. This will either fill in the cache and return, or produce a
643 llvm::Constant *StaticData[] = {
644 EmitCheckSourceLocation(Loc),
645 EmitCheckTypeDescriptor(Ty),
646 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
647 llvm::ConstantInt::get(Int8Ty, TCK)
649 llvm::Value *DynamicData[] = { Address, Hash };
650 EmitCheck(Builder.CreateICmpEQ(CacheVal, Hash),
651 "dynamic_type_cache_miss", StaticData, DynamicData,
652 CRK_AlwaysRecoverable);
656 Builder.CreateBr(Done);
661 /// Determine whether this expression refers to a flexible array member in a
662 /// struct. We disable array bounds checks for such members.
663 static bool isFlexibleArrayMemberExpr(const Expr *E) {
664 // For compatibility with existing code, we treat arrays of length 0 or
665 // 1 as flexible array members.
666 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
667 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
668 if (CAT->getSize().ugt(1))
670 } else if (!isa<IncompleteArrayType>(AT))
673 E = E->IgnoreParens();
675 // A flexible array member must be the last member in the class.
676 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
677 // FIXME: If the base type of the member expr is not FD->getParent(),
678 // this should not be treated as a flexible array member access.
679 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
680 RecordDecl::field_iterator FI(
681 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
682 return ++FI == FD->getParent()->field_end();
689 /// If Base is known to point to the start of an array, return the length of
690 /// that array. Return 0 if the length cannot be determined.
691 static llvm::Value *getArrayIndexingBound(
692 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
693 // For the vector indexing extension, the bound is the number of elements.
694 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
695 IndexedType = Base->getType();
696 return CGF.Builder.getInt32(VT->getNumElements());
699 Base = Base->IgnoreParens();
701 if (const CastExpr *CE = dyn_cast<CastExpr>(Base)) {
702 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
703 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
704 IndexedType = CE->getSubExpr()->getType();
705 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
706 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT))
707 return CGF.Builder.getInt(CAT->getSize());
708 else if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(AT))
709 return CGF.getVLASize(VAT).first;
716 void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
717 llvm::Value *Index, QualType IndexType,
719 assert(SanOpts->Bounds && "should not be called unless adding bounds checks");
721 QualType IndexedType;
722 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
726 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
727 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
728 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
730 llvm::Constant *StaticData[] = {
731 EmitCheckSourceLocation(E->getExprLoc()),
732 EmitCheckTypeDescriptor(IndexedType),
733 EmitCheckTypeDescriptor(IndexType)
735 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
736 : Builder.CreateICmpULE(IndexVal, BoundVal);
737 EmitCheck(Check, "out_of_bounds", StaticData, Index, CRK_Recoverable);
741 CodeGenFunction::ComplexPairTy CodeGenFunction::
742 EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
743 bool isInc, bool isPre) {
744 ComplexPairTy InVal = EmitLoadOfComplex(LV);
746 llvm::Value *NextVal;
747 if (isa<llvm::IntegerType>(InVal.first->getType())) {
748 uint64_t AmountVal = isInc ? 1 : -1;
749 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
751 // Add the inc/dec to the real part.
752 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
754 QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType();
755 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
758 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
760 // Add the inc/dec to the real part.
761 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
764 ComplexPairTy IncVal(NextVal, InVal.second);
766 // Store the updated result through the lvalue.
767 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
769 // If this is a postinc, return the value read from memory, otherwise use the
771 return isPre ? IncVal : InVal;
775 //===----------------------------------------------------------------------===//
776 // LValue Expression Emission
777 //===----------------------------------------------------------------------===//
779 RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
780 if (Ty->isVoidType())
781 return RValue::get(0);
783 switch (getEvaluationKind(Ty)) {
786 ConvertType(Ty->castAs<ComplexType>()->getElementType());
787 llvm::Value *U = llvm::UndefValue::get(EltTy);
788 return RValue::getComplex(std::make_pair(U, U));
791 // If this is a use of an undefined aggregate type, the aggregate must have an
792 // identifiable address. Just because the contents of the value are undefined
793 // doesn't mean that the address can't be taken and compared.
794 case TEK_Aggregate: {
795 llvm::Value *DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
796 return RValue::getAggregate(DestPtr);
800 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
802 llvm_unreachable("bad evaluation kind");
805 RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
807 ErrorUnsupported(E, Name);
808 return GetUndefRValue(E->getType());
811 LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
813 ErrorUnsupported(E, Name);
814 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
815 return MakeAddrLValue(llvm::UndefValue::get(Ty), E->getType());
818 LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
820 if (SanOpts->Bounds && isa<ArraySubscriptExpr>(E))
821 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
824 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple())
825 EmitTypeCheck(TCK, E->getExprLoc(), LV.getAddress(),
826 E->getType(), LV.getAlignment());
830 /// EmitLValue - Emit code to compute a designator that specifies the location
831 /// of the expression.
833 /// This can return one of two things: a simple address or a bitfield reference.
834 /// In either case, the LLVM Value* in the LValue structure is guaranteed to be
835 /// an LLVM pointer type.
837 /// If this returns a bitfield reference, nothing about the pointee type of the
838 /// LLVM value is known: For example, it may not be a pointer to an integer.
840 /// If this returns a normal address, and if the lvalue's C type is fixed size,
841 /// this method guarantees that the returned pointer type will point to an LLVM
842 /// type of the same size of the lvalue's type. If the lvalue has a variable
843 /// length type, this is not possible.
845 LValue CodeGenFunction::EmitLValue(const Expr *E) {
846 switch (E->getStmtClass()) {
847 default: return EmitUnsupportedLValue(E, "l-value expression");
849 case Expr::ObjCPropertyRefExprClass:
850 llvm_unreachable("cannot emit a property reference directly");
852 case Expr::ObjCSelectorExprClass:
853 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
854 case Expr::ObjCIsaExprClass:
855 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
856 case Expr::BinaryOperatorClass:
857 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
858 case Expr::CompoundAssignOperatorClass:
859 if (!E->getType()->isAnyComplexType())
860 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
861 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
862 case Expr::CallExprClass:
863 case Expr::CXXMemberCallExprClass:
864 case Expr::CXXOperatorCallExprClass:
865 case Expr::UserDefinedLiteralClass:
866 return EmitCallExprLValue(cast<CallExpr>(E));
867 case Expr::VAArgExprClass:
868 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
869 case Expr::DeclRefExprClass:
870 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
871 case Expr::ParenExprClass:
872 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
873 case Expr::GenericSelectionExprClass:
874 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
875 case Expr::PredefinedExprClass:
876 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
877 case Expr::StringLiteralClass:
878 return EmitStringLiteralLValue(cast<StringLiteral>(E));
879 case Expr::ObjCEncodeExprClass:
880 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
881 case Expr::PseudoObjectExprClass:
882 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
883 case Expr::InitListExprClass:
884 return EmitInitListLValue(cast<InitListExpr>(E));
885 case Expr::CXXTemporaryObjectExprClass:
886 case Expr::CXXConstructExprClass:
887 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
888 case Expr::CXXBindTemporaryExprClass:
889 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
890 case Expr::CXXUuidofExprClass:
891 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
892 case Expr::LambdaExprClass:
893 return EmitLambdaLValue(cast<LambdaExpr>(E));
895 case Expr::ExprWithCleanupsClass: {
896 const ExprWithCleanups *cleanups = cast<ExprWithCleanups>(E);
897 enterFullExpression(cleanups);
898 RunCleanupsScope Scope(*this);
899 return EmitLValue(cleanups->getSubExpr());
902 case Expr::CXXScalarValueInitExprClass:
903 return EmitNullInitializationLValue(cast<CXXScalarValueInitExpr>(E));
904 case Expr::CXXDefaultArgExprClass:
905 return EmitLValue(cast<CXXDefaultArgExpr>(E)->getExpr());
906 case Expr::CXXDefaultInitExprClass: {
907 CXXDefaultInitExprScope Scope(*this);
908 return EmitLValue(cast<CXXDefaultInitExpr>(E)->getExpr());
910 case Expr::CXXTypeidExprClass:
911 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
913 case Expr::ObjCMessageExprClass:
914 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
915 case Expr::ObjCIvarRefExprClass:
916 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
917 case Expr::StmtExprClass:
918 return EmitStmtExprLValue(cast<StmtExpr>(E));
919 case Expr::UnaryOperatorClass:
920 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
921 case Expr::ArraySubscriptExprClass:
922 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
923 case Expr::ExtVectorElementExprClass:
924 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
925 case Expr::MemberExprClass:
926 return EmitMemberExpr(cast<MemberExpr>(E));
927 case Expr::CompoundLiteralExprClass:
928 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
929 case Expr::ConditionalOperatorClass:
930 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
931 case Expr::BinaryConditionalOperatorClass:
932 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
933 case Expr::ChooseExprClass:
934 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr(getContext()));
935 case Expr::OpaqueValueExprClass:
936 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
937 case Expr::SubstNonTypeTemplateParmExprClass:
938 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
939 case Expr::ImplicitCastExprClass:
940 case Expr::CStyleCastExprClass:
941 case Expr::CXXFunctionalCastExprClass:
942 case Expr::CXXStaticCastExprClass:
943 case Expr::CXXDynamicCastExprClass:
944 case Expr::CXXReinterpretCastExprClass:
945 case Expr::CXXConstCastExprClass:
946 case Expr::ObjCBridgedCastExprClass:
947 return EmitCastLValue(cast<CastExpr>(E));
949 case Expr::MaterializeTemporaryExprClass:
950 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
954 /// Given an object of the given canonical type, can we safely copy a
955 /// value out of it based on its initializer?
956 static bool isConstantEmittableObjectType(QualType type) {
957 assert(type.isCanonical());
958 assert(!type->isReferenceType());
960 // Must be const-qualified but non-volatile.
961 Qualifiers qs = type.getLocalQualifiers();
962 if (!qs.hasConst() || qs.hasVolatile()) return false;
964 // Otherwise, all object types satisfy this except C++ classes with
965 // mutable subobjects or non-trivial copy/destroy behavior.
966 if (const RecordType *RT = dyn_cast<RecordType>(type))
967 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
968 if (RD->hasMutableFields() || !RD->isTrivial())
974 /// Can we constant-emit a load of a reference to a variable of the
975 /// given type? This is different from predicates like
976 /// Decl::isUsableInConstantExpressions because we do want it to apply
977 /// in situations that don't necessarily satisfy the language's rules
978 /// for this (e.g. C++'s ODR-use rules). For example, we want to able
979 /// to do this with const float variables even if those variables
980 /// aren't marked 'constexpr'.
981 enum ConstantEmissionKind {
984 CEK_AsValueOrReference,
987 static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
988 type = type.getCanonicalType();
989 if (const ReferenceType *ref = dyn_cast<ReferenceType>(type)) {
990 if (isConstantEmittableObjectType(ref->getPointeeType()))
991 return CEK_AsValueOrReference;
992 return CEK_AsReferenceOnly;
994 if (isConstantEmittableObjectType(type))
995 return CEK_AsValueOnly;
999 /// Try to emit a reference to the given value without producing it as
1000 /// an l-value. This is actually more than an optimization: we can't
1001 /// produce an l-value for variables that we never actually captured
1002 /// in a block or lambda, which means const int variables or constexpr
1003 /// literals or similar.
1004 CodeGenFunction::ConstantEmission
1005 CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
1006 ValueDecl *value = refExpr->getDecl();
1008 // The value needs to be an enum constant or a constant variable.
1009 ConstantEmissionKind CEK;
1010 if (isa<ParmVarDecl>(value)) {
1012 } else if (VarDecl *var = dyn_cast<VarDecl>(value)) {
1013 CEK = checkVarTypeForConstantEmission(var->getType());
1014 } else if (isa<EnumConstantDecl>(value)) {
1015 CEK = CEK_AsValueOnly;
1019 if (CEK == CEK_None) return ConstantEmission();
1021 Expr::EvalResult result;
1022 bool resultIsReference;
1023 QualType resultType;
1025 // It's best to evaluate all the way as an r-value if that's permitted.
1026 if (CEK != CEK_AsReferenceOnly &&
1027 refExpr->EvaluateAsRValue(result, getContext())) {
1028 resultIsReference = false;
1029 resultType = refExpr->getType();
1031 // Otherwise, try to evaluate as an l-value.
1032 } else if (CEK != CEK_AsValueOnly &&
1033 refExpr->EvaluateAsLValue(result, getContext())) {
1034 resultIsReference = true;
1035 resultType = value->getType();
1039 return ConstantEmission();
1042 // In any case, if the initializer has side-effects, abandon ship.
1043 if (result.HasSideEffects)
1044 return ConstantEmission();
1046 // Emit as a constant.
1047 llvm::Constant *C = CGM.EmitConstantValue(result.Val, resultType, this);
1049 // Make sure we emit a debug reference to the global variable.
1050 // This should probably fire even for
1051 if (isa<VarDecl>(value)) {
1052 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1053 EmitDeclRefExprDbgValue(refExpr, C);
1055 assert(isa<EnumConstantDecl>(value));
1056 EmitDeclRefExprDbgValue(refExpr, C);
1059 // If we emitted a reference constant, we need to dereference that.
1060 if (resultIsReference)
1061 return ConstantEmission::forReference(C);
1063 return ConstantEmission::forValue(C);
1066 llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue) {
1067 return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
1068 lvalue.getAlignment().getQuantity(),
1069 lvalue.getType(), lvalue.getTBAAInfo(),
1070 lvalue.getTBAABaseType(), lvalue.getTBAAOffset());
1073 static bool hasBooleanRepresentation(QualType Ty) {
1074 if (Ty->isBooleanType())
1077 if (const EnumType *ET = Ty->getAs<EnumType>())
1078 return ET->getDecl()->getIntegerType()->isBooleanType();
1080 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1081 return hasBooleanRepresentation(AT->getValueType());
1086 static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1087 llvm::APInt &Min, llvm::APInt &End,
1089 const EnumType *ET = Ty->getAs<EnumType>();
1090 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1091 ET && !ET->getDecl()->isFixed();
1092 bool IsBool = hasBooleanRepresentation(Ty);
1093 if (!IsBool && !IsRegularCPlusPlusEnum)
1097 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1098 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1100 const EnumDecl *ED = ET->getDecl();
1101 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1102 unsigned Bitwidth = LTy->getScalarSizeInBits();
1103 unsigned NumNegativeBits = ED->getNumNegativeBits();
1104 unsigned NumPositiveBits = ED->getNumPositiveBits();
1106 if (NumNegativeBits) {
1107 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1108 assert(NumBits <= Bitwidth);
1109 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1112 assert(NumPositiveBits <= Bitwidth);
1113 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1114 Min = llvm::APInt(Bitwidth, 0);
1120 llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1121 llvm::APInt Min, End;
1122 if (!getRangeForType(*this, Ty, Min, End,
1123 CGM.getCodeGenOpts().StrictEnums))
1126 llvm::MDBuilder MDHelper(getLLVMContext());
1127 return MDHelper.createRange(Min, End);
1130 llvm::Value *CodeGenFunction::EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
1131 unsigned Alignment, QualType Ty,
1132 llvm::MDNode *TBAAInfo,
1133 QualType TBAABaseType,
1134 uint64_t TBAAOffset) {
1135 // For better performance, handle vector loads differently.
1136 if (Ty->isVectorType()) {
1138 const llvm::Type *EltTy =
1139 cast<llvm::PointerType>(Addr->getType())->getElementType();
1141 const llvm::VectorType *VTy = cast<llvm::VectorType>(EltTy);
1143 // Handle vectors of size 3, like size 4 for better performance.
1144 if (VTy->getNumElements() == 3) {
1146 // Bitcast to vec4 type.
1147 llvm::VectorType *vec4Ty = llvm::VectorType::get(VTy->getElementType(),
1149 llvm::PointerType *ptVec4Ty =
1150 llvm::PointerType::get(vec4Ty,
1151 (cast<llvm::PointerType>(
1152 Addr->getType()))->getAddressSpace());
1153 llvm::Value *Cast = Builder.CreateBitCast(Addr, ptVec4Ty,
1156 llvm::Value *LoadVal = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1158 // Shuffle vector to get vec3.
1159 llvm::Constant *Mask[] = {
1160 llvm::ConstantInt::get(llvm::Type::getInt32Ty(getLLVMContext()), 0),
1161 llvm::ConstantInt::get(llvm::Type::getInt32Ty(getLLVMContext()), 1),
1162 llvm::ConstantInt::get(llvm::Type::getInt32Ty(getLLVMContext()), 2)
1165 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1166 V = Builder.CreateShuffleVector(LoadVal,
1167 llvm::UndefValue::get(vec4Ty),
1168 MaskV, "extractVec");
1169 return EmitFromMemory(V, Ty);
1173 // Atomic operations have to be done on integral types.
1174 if (Ty->isAtomicType()) {
1175 LValue lvalue = LValue::MakeAddr(Addr, Ty,
1176 CharUnits::fromQuantity(Alignment),
1177 getContext(), TBAAInfo);
1178 return EmitAtomicLoad(lvalue).getScalarVal();
1181 llvm::LoadInst *Load = Builder.CreateLoad(Addr);
1183 Load->setVolatile(true);
1185 Load->setAlignment(Alignment);
1187 llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
1189 CGM.DecorateInstruction(Load, TBAAPath, false/*ConvertTypeToTag*/);
1192 if ((SanOpts->Bool && hasBooleanRepresentation(Ty)) ||
1193 (SanOpts->Enum && Ty->getAs<EnumType>())) {
1194 llvm::APInt Min, End;
1195 if (getRangeForType(*this, Ty, Min, End, true)) {
1199 Check = Builder.CreateICmpULE(
1200 Load, llvm::ConstantInt::get(getLLVMContext(), End));
1202 llvm::Value *Upper = Builder.CreateICmpSLE(
1203 Load, llvm::ConstantInt::get(getLLVMContext(), End));
1204 llvm::Value *Lower = Builder.CreateICmpSGE(
1205 Load, llvm::ConstantInt::get(getLLVMContext(), Min));
1206 Check = Builder.CreateAnd(Upper, Lower);
1208 // FIXME: Provide a SourceLocation.
1209 EmitCheck(Check, "load_invalid_value", EmitCheckTypeDescriptor(Ty),
1210 EmitCheckValue(Load), CRK_Recoverable);
1212 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1213 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1214 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1216 return EmitFromMemory(Load, Ty);
1219 llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1220 // Bool has a different representation in memory than in registers.
1221 if (hasBooleanRepresentation(Ty)) {
1222 // This should really always be an i1, but sometimes it's already
1223 // an i8, and it's awkward to track those cases down.
1224 if (Value->getType()->isIntegerTy(1))
1225 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1226 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
1227 "wrong value rep of bool");
1233 llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1234 // Bool has a different representation in memory than in registers.
1235 if (hasBooleanRepresentation(Ty)) {
1236 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
1237 "wrong value rep of bool");
1238 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1244 void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
1245 bool Volatile, unsigned Alignment,
1247 llvm::MDNode *TBAAInfo,
1248 bool isInit, QualType TBAABaseType,
1249 uint64_t TBAAOffset) {
1251 // Handle vectors differently to get better performance.
1252 if (Ty->isVectorType()) {
1253 llvm::Type *SrcTy = Value->getType();
1254 llvm::VectorType *VecTy = cast<llvm::VectorType>(SrcTy);
1255 // Handle vec3 special.
1256 if (VecTy->getNumElements() == 3) {
1257 llvm::LLVMContext &VMContext = getLLVMContext();
1259 // Our source is a vec3, do a shuffle vector to make it a vec4.
1260 SmallVector<llvm::Constant*, 4> Mask;
1261 Mask.push_back(llvm::ConstantInt::get(
1262 llvm::Type::getInt32Ty(VMContext),
1264 Mask.push_back(llvm::ConstantInt::get(
1265 llvm::Type::getInt32Ty(VMContext),
1267 Mask.push_back(llvm::ConstantInt::get(
1268 llvm::Type::getInt32Ty(VMContext),
1270 Mask.push_back(llvm::UndefValue::get(llvm::Type::getInt32Ty(VMContext)));
1272 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1273 Value = Builder.CreateShuffleVector(Value,
1274 llvm::UndefValue::get(VecTy),
1275 MaskV, "extractVec");
1276 SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
1278 llvm::PointerType *DstPtr = cast<llvm::PointerType>(Addr->getType());
1279 if (DstPtr->getElementType() != SrcTy) {
1281 llvm::PointerType::get(SrcTy, DstPtr->getAddressSpace());
1282 Addr = Builder.CreateBitCast(Addr, MemTy, "storetmp");
1286 Value = EmitToMemory(Value, Ty);
1288 if (Ty->isAtomicType()) {
1289 EmitAtomicStore(RValue::get(Value),
1290 LValue::MakeAddr(Addr, Ty,
1291 CharUnits::fromQuantity(Alignment),
1292 getContext(), TBAAInfo),
1297 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1299 Store->setAlignment(Alignment);
1301 llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
1303 CGM.DecorateInstruction(Store, TBAAPath, false/*ConvertTypeToTag*/);
1307 void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1309 EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
1310 lvalue.getAlignment().getQuantity(), lvalue.getType(),
1311 lvalue.getTBAAInfo(), isInit, lvalue.getTBAABaseType(),
1312 lvalue.getTBAAOffset());
1315 /// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1316 /// method emits the address of the lvalue, then loads the result as an rvalue,
1317 /// returning the rvalue.
1318 RValue CodeGenFunction::EmitLoadOfLValue(LValue LV) {
1319 if (LV.isObjCWeak()) {
1320 // load of a __weak object.
1321 llvm::Value *AddrWeakObj = LV.getAddress();
1322 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1325 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1326 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
1327 Object = EmitObjCConsumeObject(LV.getType(), Object);
1328 return RValue::get(Object);
1331 if (LV.isSimple()) {
1332 assert(!LV.getType()->isFunctionType());
1334 // Everything needs a load.
1335 return RValue::get(EmitLoadOfScalar(LV));
1338 if (LV.isVectorElt()) {
1339 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddr(),
1340 LV.isVolatileQualified());
1341 Load->setAlignment(LV.getAlignment().getQuantity());
1342 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1346 // If this is a reference to a subset of the elements of a vector, either
1347 // shuffle the input or extract/insert them as appropriate.
1348 if (LV.isExtVectorElt())
1349 return EmitLoadOfExtVectorElementLValue(LV);
1351 assert(LV.isBitField() && "Unknown LValue type!");
1352 return EmitLoadOfBitfieldLValue(LV);
1355 RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV) {
1356 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1358 // Get the output type.
1359 llvm::Type *ResLTy = ConvertType(LV.getType());
1361 llvm::Value *Ptr = LV.getBitFieldAddr();
1362 llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(),
1364 cast<llvm::LoadInst>(Val)->setAlignment(Info.StorageAlignment);
1366 if (Info.IsSigned) {
1367 assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize);
1368 unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
1370 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1371 if (Info.Offset + HighBits)
1372 Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
1375 Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
1376 if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
1377 Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
1381 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1383 return RValue::get(Val);
1386 // If this is a reference to a subset of the elements of a vector, create an
1387 // appropriate shufflevector.
1388 RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1389 llvm::LoadInst *Load = Builder.CreateLoad(LV.getExtVectorAddr(),
1390 LV.isVolatileQualified());
1391 Load->setAlignment(LV.getAlignment().getQuantity());
1392 llvm::Value *Vec = Load;
1394 const llvm::Constant *Elts = LV.getExtVectorElts();
1396 // If the result of the expression is a non-vector type, we must be extracting
1397 // a single element. Just codegen as an extractelement.
1398 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1400 unsigned InIdx = getAccessedFieldNo(0, Elts);
1401 llvm::Value *Elt = llvm::ConstantInt::get(Int32Ty, InIdx);
1402 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1405 // Always use shuffle vector to try to retain the original program structure
1406 unsigned NumResultElts = ExprVT->getNumElements();
1408 SmallVector<llvm::Constant*, 4> Mask;
1409 for (unsigned i = 0; i != NumResultElts; ++i)
1410 Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
1412 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1413 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1415 return RValue::get(Vec);
1420 /// EmitStoreThroughLValue - Store the specified rvalue into the specified
1421 /// lvalue, where both are guaranteed to the have the same type, and that type
1423 void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit) {
1424 if (!Dst.isSimple()) {
1425 if (Dst.isVectorElt()) {
1426 // Read/modify/write the vector, inserting the new element.
1427 llvm::LoadInst *Load = Builder.CreateLoad(Dst.getVectorAddr(),
1428 Dst.isVolatileQualified());
1429 Load->setAlignment(Dst.getAlignment().getQuantity());
1430 llvm::Value *Vec = Load;
1431 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
1432 Dst.getVectorIdx(), "vecins");
1433 llvm::StoreInst *Store = Builder.CreateStore(Vec, Dst.getVectorAddr(),
1434 Dst.isVolatileQualified());
1435 Store->setAlignment(Dst.getAlignment().getQuantity());
1439 // If this is an update of extended vector elements, insert them as
1441 if (Dst.isExtVectorElt())
1442 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
1444 assert(Dst.isBitField() && "Unknown LValue type");
1445 return EmitStoreThroughBitfieldLValue(Src, Dst);
1448 // There's special magic for assigning into an ARC-qualified l-value.
1449 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
1451 case Qualifiers::OCL_None:
1452 llvm_unreachable("present but none");
1454 case Qualifiers::OCL_ExplicitNone:
1458 case Qualifiers::OCL_Strong:
1459 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
1462 case Qualifiers::OCL_Weak:
1463 EmitARCStoreWeak(Dst.getAddress(), Src.getScalarVal(), /*ignore*/ true);
1466 case Qualifiers::OCL_Autoreleasing:
1467 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
1468 Src.getScalarVal()));
1469 // fall into the normal path
1474 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
1475 // load of a __weak object.
1476 llvm::Value *LvalueDst = Dst.getAddress();
1477 llvm::Value *src = Src.getScalarVal();
1478 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
1482 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
1483 // load of a __strong object.
1484 llvm::Value *LvalueDst = Dst.getAddress();
1485 llvm::Value *src = Src.getScalarVal();
1486 if (Dst.isObjCIvar()) {
1487 assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL");
1488 llvm::Type *ResultType = ConvertType(getContext().LongTy);
1489 llvm::Value *RHS = EmitScalarExpr(Dst.getBaseIvarExp());
1490 llvm::Value *dst = RHS;
1491 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
1493 Builder.CreatePtrToInt(LvalueDst, ResultType, "sub.ptr.lhs.cast");
1494 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
1495 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
1497 } else if (Dst.isGlobalObjCRef()) {
1498 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
1499 Dst.isThreadLocalRef());
1502 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
1506 assert(Src.isScalar() && "Can't emit an agg store with this method");
1507 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
1510 void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
1511 llvm::Value **Result) {
1512 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
1513 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
1514 llvm::Value *Ptr = Dst.getBitFieldAddr();
1516 // Get the source value, truncated to the width of the bit-field.
1517 llvm::Value *SrcVal = Src.getScalarVal();
1519 // Cast the source to the storage type and shift it into place.
1520 SrcVal = Builder.CreateIntCast(SrcVal,
1521 Ptr->getType()->getPointerElementType(),
1522 /*IsSigned=*/false);
1523 llvm::Value *MaskedVal = SrcVal;
1525 // See if there are other bits in the bitfield's storage we'll need to load
1526 // and mask together with source before storing.
1527 if (Info.StorageSize != Info.Size) {
1528 assert(Info.StorageSize > Info.Size && "Invalid bitfield size.");
1529 llvm::Value *Val = Builder.CreateLoad(Ptr, Dst.isVolatileQualified(),
1531 cast<llvm::LoadInst>(Val)->setAlignment(Info.StorageAlignment);
1533 // Mask the source value as needed.
1534 if (!hasBooleanRepresentation(Dst.getType()))
1535 SrcVal = Builder.CreateAnd(SrcVal,
1536 llvm::APInt::getLowBitsSet(Info.StorageSize,
1541 SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
1543 // Mask out the original value.
1544 Val = Builder.CreateAnd(Val,
1545 ~llvm::APInt::getBitsSet(Info.StorageSize,
1547 Info.Offset + Info.Size),
1550 // Or together the unchanged values and the source value.
1551 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
1553 assert(Info.Offset == 0);
1556 // Write the new value back out.
1557 llvm::StoreInst *Store = Builder.CreateStore(SrcVal, Ptr,
1558 Dst.isVolatileQualified());
1559 Store->setAlignment(Info.StorageAlignment);
1561 // Return the new value of the bit-field, if requested.
1563 llvm::Value *ResultVal = MaskedVal;
1565 // Sign extend the value if needed.
1566 if (Info.IsSigned) {
1567 assert(Info.Size <= Info.StorageSize);
1568 unsigned HighBits = Info.StorageSize - Info.Size;
1570 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
1571 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
1575 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
1577 *Result = EmitFromMemory(ResultVal, Dst.getType());
1581 void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
1583 // This access turns into a read/modify/write of the vector. Load the input
1585 llvm::LoadInst *Load = Builder.CreateLoad(Dst.getExtVectorAddr(),
1586 Dst.isVolatileQualified());
1587 Load->setAlignment(Dst.getAlignment().getQuantity());
1588 llvm::Value *Vec = Load;
1589 const llvm::Constant *Elts = Dst.getExtVectorElts();
1591 llvm::Value *SrcVal = Src.getScalarVal();
1593 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
1594 unsigned NumSrcElts = VTy->getNumElements();
1595 unsigned NumDstElts =
1596 cast<llvm::VectorType>(Vec->getType())->getNumElements();
1597 if (NumDstElts == NumSrcElts) {
1598 // Use shuffle vector is the src and destination are the same number of
1599 // elements and restore the vector mask since it is on the side it will be
1601 SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
1602 for (unsigned i = 0; i != NumSrcElts; ++i)
1603 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
1605 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1606 Vec = Builder.CreateShuffleVector(SrcVal,
1607 llvm::UndefValue::get(Vec->getType()),
1609 } else if (NumDstElts > NumSrcElts) {
1610 // Extended the source vector to the same length and then shuffle it
1611 // into the destination.
1612 // FIXME: since we're shuffling with undef, can we just use the indices
1613 // into that? This could be simpler.
1614 SmallVector<llvm::Constant*, 4> ExtMask;
1615 for (unsigned i = 0; i != NumSrcElts; ++i)
1616 ExtMask.push_back(Builder.getInt32(i));
1617 ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
1618 llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
1619 llvm::Value *ExtSrcVal =
1620 Builder.CreateShuffleVector(SrcVal,
1621 llvm::UndefValue::get(SrcVal->getType()),
1624 SmallVector<llvm::Constant*, 4> Mask;
1625 for (unsigned i = 0; i != NumDstElts; ++i)
1626 Mask.push_back(Builder.getInt32(i));
1628 // modify when what gets shuffled in
1629 for (unsigned i = 0; i != NumSrcElts; ++i)
1630 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
1631 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1632 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
1634 // We should never shorten the vector
1635 llvm_unreachable("unexpected shorten vector length");
1638 // If the Src is a scalar (not a vector) it must be updating one element.
1639 unsigned InIdx = getAccessedFieldNo(0, Elts);
1640 llvm::Value *Elt = llvm::ConstantInt::get(Int32Ty, InIdx);
1641 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
1644 llvm::StoreInst *Store = Builder.CreateStore(Vec, Dst.getExtVectorAddr(),
1645 Dst.isVolatileQualified());
1646 Store->setAlignment(Dst.getAlignment().getQuantity());
1649 // setObjCGCLValueClass - sets class of he lvalue for the purpose of
1650 // generating write-barries API. It is currently a global, ivar,
1652 static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
1654 bool IsMemberAccess=false) {
1655 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
1658 if (isa<ObjCIvarRefExpr>(E)) {
1659 QualType ExpTy = E->getType();
1660 if (IsMemberAccess && ExpTy->isPointerType()) {
1661 // If ivar is a structure pointer, assigning to field of
1662 // this struct follows gcc's behavior and makes it a non-ivar
1663 // writer-barrier conservatively.
1664 ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
1665 if (ExpTy->isRecordType()) {
1666 LV.setObjCIvar(false);
1670 LV.setObjCIvar(true);
1671 ObjCIvarRefExpr *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr*>(E));
1672 LV.setBaseIvarExp(Exp->getBase());
1673 LV.setObjCArray(E->getType()->isArrayType());
1677 if (const DeclRefExpr *Exp = dyn_cast<DeclRefExpr>(E)) {
1678 if (const VarDecl *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
1679 if (VD->hasGlobalStorage()) {
1680 LV.setGlobalObjCRef(true);
1681 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
1684 LV.setObjCArray(E->getType()->isArrayType());
1688 if (const UnaryOperator *Exp = dyn_cast<UnaryOperator>(E)) {
1689 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1693 if (const ParenExpr *Exp = dyn_cast<ParenExpr>(E)) {
1694 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1695 if (LV.isObjCIvar()) {
1696 // If cast is to a structure pointer, follow gcc's behavior and make it
1697 // a non-ivar write-barrier.
1698 QualType ExpTy = E->getType();
1699 if (ExpTy->isPointerType())
1700 ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
1701 if (ExpTy->isRecordType())
1702 LV.setObjCIvar(false);
1707 if (const GenericSelectionExpr *Exp = dyn_cast<GenericSelectionExpr>(E)) {
1708 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
1712 if (const ImplicitCastExpr *Exp = dyn_cast<ImplicitCastExpr>(E)) {
1713 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1717 if (const CStyleCastExpr *Exp = dyn_cast<CStyleCastExpr>(E)) {
1718 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1722 if (const ObjCBridgedCastExpr *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
1723 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1727 if (const ArraySubscriptExpr *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
1728 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
1729 if (LV.isObjCIvar() && !LV.isObjCArray())
1730 // Using array syntax to assigning to what an ivar points to is not
1731 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
1732 LV.setObjCIvar(false);
1733 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
1734 // Using array syntax to assigning to what global points to is not
1735 // same as assigning to the global itself. {id *G;} G[i] = 0;
1736 LV.setGlobalObjCRef(false);
1740 if (const MemberExpr *Exp = dyn_cast<MemberExpr>(E)) {
1741 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
1742 // We don't know if member is an 'ivar', but this flag is looked at
1743 // only in the context of LV.isObjCIvar().
1744 LV.setObjCArray(E->getType()->isArrayType());
1749 static llvm::Value *
1750 EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
1751 llvm::Value *V, llvm::Type *IRType,
1752 StringRef Name = StringRef()) {
1753 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
1754 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
1757 static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
1758 const Expr *E, const VarDecl *VD) {
1759 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
1760 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
1761 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
1762 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
1763 QualType T = E->getType();
1765 if (VD->getType()->isReferenceType()) {
1766 llvm::LoadInst *LI = CGF.Builder.CreateLoad(V);
1767 LI->setAlignment(Alignment.getQuantity());
1769 LV = CGF.MakeNaturalAlignAddrLValue(V, T);
1771 LV = CGF.MakeAddrLValue(V, E->getType(), Alignment);
1773 setObjCGCLValueClass(CGF.getContext(), E, LV);
1777 static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
1778 const Expr *E, const FunctionDecl *FD) {
1779 llvm::Value *V = CGF.CGM.GetAddrOfFunction(FD);
1780 if (!FD->hasPrototype()) {
1781 if (const FunctionProtoType *Proto =
1782 FD->getType()->getAs<FunctionProtoType>()) {
1783 // Ugly case: for a K&R-style definition, the type of the definition
1784 // isn't the same as the type of a use. Correct for this with a
1786 QualType NoProtoType =
1787 CGF.getContext().getFunctionNoProtoType(Proto->getResultType());
1788 NoProtoType = CGF.getContext().getPointerType(NoProtoType);
1789 V = CGF.Builder.CreateBitCast(V, CGF.ConvertType(NoProtoType));
1792 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
1793 return CGF.MakeAddrLValue(V, E->getType(), Alignment);
1796 LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
1797 const NamedDecl *ND = E->getDecl();
1798 CharUnits Alignment = getContext().getDeclAlign(ND);
1799 QualType T = E->getType();
1801 // A DeclRefExpr for a reference initialized by a constant expression can
1802 // appear without being odr-used. Directly emit the constant initializer.
1803 if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
1804 const Expr *Init = VD->getAnyInitializer(VD);
1805 if (Init && !isa<ParmVarDecl>(VD) && VD->getType()->isReferenceType() &&
1806 VD->isUsableInConstantExpressions(getContext()) &&
1807 VD->checkInitIsICE()) {
1808 llvm::Constant *Val =
1809 CGM.EmitConstantValue(*VD->evaluateValue(), VD->getType(), this);
1810 assert(Val && "failed to emit reference constant expression");
1811 // FIXME: Eventually we will want to emit vector element references.
1812 return MakeAddrLValue(Val, T, Alignment);
1816 // FIXME: We should be able to assert this for FunctionDecls as well!
1817 // FIXME: We should be able to assert this for all DeclRefExprs, not just
1818 // those with a valid source location.
1819 assert((ND->isUsed(false) || !isa<VarDecl>(ND) ||
1820 !E->getLocation().isValid()) &&
1821 "Should not use decl without marking it used!");
1823 if (ND->hasAttr<WeakRefAttr>()) {
1824 const ValueDecl *VD = cast<ValueDecl>(ND);
1825 llvm::Constant *Aliasee = CGM.GetWeakRefReference(VD);
1826 return MakeAddrLValue(Aliasee, T, Alignment);
1829 if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
1830 // Check if this is a global variable.
1831 if (VD->hasLinkage() || VD->isStaticDataMember()) {
1832 // If it's thread_local, emit a call to its wrapper function instead.
1833 if (VD->getTLSKind() == VarDecl::TLS_Dynamic)
1834 return CGM.getCXXABI().EmitThreadLocalDeclRefExpr(*this, E);
1835 return EmitGlobalVarDeclLValue(*this, E, VD);
1838 bool isBlockVariable = VD->hasAttr<BlocksAttr>();
1840 llvm::Value *V = LocalDeclMap.lookup(VD);
1841 if (!V && VD->isStaticLocal())
1842 V = CGM.getStaticLocalDeclAddress(VD);
1844 // Use special handling for lambdas.
1846 if (FieldDecl *FD = LambdaCaptureFields.lookup(VD)) {
1847 QualType LambdaTagType = getContext().getTagDeclType(FD->getParent());
1848 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue,
1850 return EmitLValueForField(LambdaLV, FD);
1853 assert(isa<BlockDecl>(CurCodeDecl) && E->refersToEnclosingLocal());
1854 return MakeAddrLValue(GetAddrOfBlockDecl(VD, isBlockVariable),
1858 assert(V && "DeclRefExpr not entered in LocalDeclMap?");
1860 if (isBlockVariable)
1861 V = BuildBlockByrefAddress(V, VD);
1864 if (VD->getType()->isReferenceType()) {
1865 llvm::LoadInst *LI = Builder.CreateLoad(V);
1866 LI->setAlignment(Alignment.getQuantity());
1868 LV = MakeNaturalAlignAddrLValue(V, T);
1870 LV = MakeAddrLValue(V, T, Alignment);
1873 bool isLocalStorage = VD->hasLocalStorage();
1875 bool NonGCable = isLocalStorage &&
1876 !VD->getType()->isReferenceType() &&
1879 LV.getQuals().removeObjCGCAttr();
1883 bool isImpreciseLifetime =
1884 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
1885 if (isImpreciseLifetime)
1886 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
1887 setObjCGCLValueClass(getContext(), E, LV);
1891 if (const FunctionDecl *fn = dyn_cast<FunctionDecl>(ND))
1892 return EmitFunctionDeclLValue(*this, E, fn);
1894 llvm_unreachable("Unhandled DeclRefExpr");
1897 LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
1898 // __extension__ doesn't affect lvalue-ness.
1899 if (E->getOpcode() == UO_Extension)
1900 return EmitLValue(E->getSubExpr());
1902 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
1903 switch (E->getOpcode()) {
1904 default: llvm_unreachable("Unknown unary operator lvalue!");
1906 QualType T = E->getSubExpr()->getType()->getPointeeType();
1907 assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type");
1909 LValue LV = MakeNaturalAlignAddrLValue(EmitScalarExpr(E->getSubExpr()), T);
1910 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
1912 // We should not generate __weak write barrier on indirect reference
1913 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
1914 // But, we continue to generate __strong write barrier on indirect write
1915 // into a pointer to object.
1916 if (getLangOpts().ObjC1 &&
1917 getLangOpts().getGC() != LangOptions::NonGC &&
1919 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
1924 LValue LV = EmitLValue(E->getSubExpr());
1925 assert(LV.isSimple() && "real/imag on non-ordinary l-value");
1926 llvm::Value *Addr = LV.getAddress();
1928 // __real is valid on scalars. This is a faster way of testing that.
1929 // __imag can only produce an rvalue on scalars.
1930 if (E->getOpcode() == UO_Real &&
1931 !cast<llvm::PointerType>(Addr->getType())
1932 ->getElementType()->isStructTy()) {
1933 assert(E->getSubExpr()->getType()->isArithmeticType());
1937 assert(E->getSubExpr()->getType()->isAnyComplexType());
1939 unsigned Idx = E->getOpcode() == UO_Imag;
1940 return MakeAddrLValue(Builder.CreateStructGEP(LV.getAddress(),
1946 LValue LV = EmitLValue(E->getSubExpr());
1947 bool isInc = E->getOpcode() == UO_PreInc;
1949 if (E->getType()->isAnyComplexType())
1950 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
1952 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
1958 LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
1959 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
1963 LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
1964 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
1968 static llvm::Constant*
1969 GetAddrOfConstantWideString(StringRef Str,
1970 const char *GlobalName,
1971 ASTContext &Context,
1972 QualType Ty, SourceLocation Loc,
1973 CodeGenModule &CGM) {
1975 StringLiteral *SL = StringLiteral::Create(Context,
1977 StringLiteral::Wide,
1980 llvm::Constant *C = CGM.GetConstantArrayFromStringLiteral(SL);
1981 llvm::GlobalVariable *GV =
1982 new llvm::GlobalVariable(CGM.getModule(), C->getType(),
1983 !CGM.getLangOpts().WritableStrings,
1984 llvm::GlobalValue::PrivateLinkage,
1986 const unsigned WideAlignment =
1987 Context.getTypeAlignInChars(Ty).getQuantity();
1988 GV->setAlignment(WideAlignment);
1992 static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source,
1993 SmallString<32>& Target) {
1994 Target.resize(CharByteWidth * (Source.size() + 1));
1995 char *ResultPtr = &Target[0];
1996 const UTF8 *ErrorPtr;
1997 bool success = ConvertUTF8toWide(CharByteWidth, Source, ResultPtr, ErrorPtr);
2000 Target.resize(ResultPtr - &Target[0]);
2003 LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2004 switch (E->getIdentType()) {
2006 return EmitUnsupportedLValue(E, "predefined expression");
2008 case PredefinedExpr::Func:
2009 case PredefinedExpr::Function:
2010 case PredefinedExpr::LFunction:
2011 case PredefinedExpr::PrettyFunction: {
2012 unsigned IdentType = E->getIdentType();
2013 std::string GlobalVarName;
2015 switch (IdentType) {
2016 default: llvm_unreachable("Invalid type");
2017 case PredefinedExpr::Func:
2018 GlobalVarName = "__func__.";
2020 case PredefinedExpr::Function:
2021 GlobalVarName = "__FUNCTION__.";
2023 case PredefinedExpr::LFunction:
2024 GlobalVarName = "L__FUNCTION__.";
2026 case PredefinedExpr::PrettyFunction:
2027 GlobalVarName = "__PRETTY_FUNCTION__.";
2031 StringRef FnName = CurFn->getName();
2032 if (FnName.startswith("\01"))
2033 FnName = FnName.substr(1);
2034 GlobalVarName += FnName;
2036 const Decl *CurDecl = CurCodeDecl;
2038 CurDecl = getContext().getTranslationUnitDecl();
2040 std::string FunctionName =
2041 (isa<BlockDecl>(CurDecl)
2043 : PredefinedExpr::ComputeName((PredefinedExpr::IdentType)IdentType,
2046 const Type* ElemType = E->getType()->getArrayElementTypeNoTypeQual();
2048 if (ElemType->isWideCharType()) {
2049 SmallString<32> RawChars;
2050 ConvertUTF8ToWideString(
2051 getContext().getTypeSizeInChars(ElemType).getQuantity(),
2052 FunctionName, RawChars);
2053 C = GetAddrOfConstantWideString(RawChars,
2054 GlobalVarName.c_str(),
2060 C = CGM.GetAddrOfConstantCString(FunctionName,
2061 GlobalVarName.c_str(),
2064 return MakeAddrLValue(C, E->getType());
2069 /// Emit a type description suitable for use by a runtime sanitizer library. The
2070 /// format of a type descriptor is
2073 /// { i16 TypeKind, i16 TypeInfo }
2076 /// followed by an array of i8 containing the type name. TypeKind is 0 for an
2077 /// integer, 1 for a floating point value, and -1 for anything else.
2078 llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2079 // FIXME: Only emit each type's descriptor once.
2080 uint16_t TypeKind = -1;
2081 uint16_t TypeInfo = 0;
2083 if (T->isIntegerType()) {
2085 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2086 (T->isSignedIntegerType() ? 1 : 0);
2087 } else if (T->isFloatingType()) {
2089 TypeInfo = getContext().getTypeSize(T);
2092 // Format the type name as if for a diagnostic, including quotes and
2093 // optionally an 'aka'.
2094 SmallString<32> Buffer;
2095 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2096 (intptr_t)T.getAsOpaquePtr(),
2097 0, 0, 0, 0, 0, 0, Buffer,
2098 ArrayRef<intptr_t>());
2100 llvm::Constant *Components[] = {
2101 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2102 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2104 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2106 llvm::GlobalVariable *GV =
2107 new llvm::GlobalVariable(CGM.getModule(), Descriptor->getType(),
2108 /*isConstant=*/true,
2109 llvm::GlobalVariable::PrivateLinkage,
2111 GV->setUnnamedAddr(true);
2115 llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2116 llvm::Type *TargetTy = IntPtrTy;
2118 // Floating-point types which fit into intptr_t are bitcast to integers
2119 // and then passed directly (after zero-extension, if necessary).
2120 if (V->getType()->isFloatingPointTy()) {
2121 unsigned Bits = V->getType()->getPrimitiveSizeInBits();
2122 if (Bits <= TargetTy->getIntegerBitWidth())
2123 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
2127 // Integers which fit in intptr_t are zero-extended and passed directly.
2128 if (V->getType()->isIntegerTy() &&
2129 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
2130 return Builder.CreateZExt(V, TargetTy);
2132 // Pointers are passed directly, everything else is passed by address.
2133 if (!V->getType()->isPointerTy()) {
2134 llvm::Value *Ptr = CreateTempAlloca(V->getType());
2135 Builder.CreateStore(V, Ptr);
2138 return Builder.CreatePtrToInt(V, TargetTy);
2141 /// \brief Emit a representation of a SourceLocation for passing to a handler
2142 /// in a sanitizer runtime library. The format for this data is:
2144 /// struct SourceLocation {
2145 /// const char *Filename;
2146 /// int32_t Line, Column;
2149 /// For an invalid SourceLocation, the Filename pointer is null.
2150 llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
2151 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
2153 llvm::Constant *Data[] = {
2154 // FIXME: Only emit each file name once.
2155 PLoc.isValid() ? cast<llvm::Constant>(
2156 Builder.CreateGlobalStringPtr(PLoc.getFilename()))
2157 : llvm::Constant::getNullValue(Int8PtrTy),
2158 Builder.getInt32(PLoc.getLine()),
2159 Builder.getInt32(PLoc.getColumn())
2162 return llvm::ConstantStruct::getAnon(Data);
2165 void CodeGenFunction::EmitCheck(llvm::Value *Checked, StringRef CheckName,
2166 ArrayRef<llvm::Constant *> StaticArgs,
2167 ArrayRef<llvm::Value *> DynamicArgs,
2168 CheckRecoverableKind RecoverKind) {
2169 assert(SanOpts != &SanitizerOptions::Disabled);
2171 if (CGM.getCodeGenOpts().SanitizeUndefinedTrapOnError) {
2172 assert (RecoverKind != CRK_AlwaysRecoverable &&
2173 "Runtime call required for AlwaysRecoverable kind!");
2174 return EmitTrapCheck(Checked);
2177 llvm::BasicBlock *Cont = createBasicBlock("cont");
2179 llvm::BasicBlock *Handler = createBasicBlock("handler." + CheckName);
2181 llvm::Instruction *Branch = Builder.CreateCondBr(Checked, Cont, Handler);
2183 // Give hint that we very much don't expect to execute the handler
2184 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
2185 llvm::MDBuilder MDHelper(getLLVMContext());
2186 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
2187 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
2191 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
2192 llvm::GlobalValue *InfoPtr =
2193 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
2194 llvm::GlobalVariable::PrivateLinkage, Info);
2195 InfoPtr->setUnnamedAddr(true);
2197 SmallVector<llvm::Value *, 4> Args;
2198 SmallVector<llvm::Type *, 4> ArgTypes;
2199 Args.reserve(DynamicArgs.size() + 1);
2200 ArgTypes.reserve(DynamicArgs.size() + 1);
2202 // Handler functions take an i8* pointing to the (handler-specific) static
2203 // information block, followed by a sequence of intptr_t arguments
2204 // representing operand values.
2205 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
2206 ArgTypes.push_back(Int8PtrTy);
2207 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
2208 Args.push_back(EmitCheckValue(DynamicArgs[i]));
2209 ArgTypes.push_back(IntPtrTy);
2212 bool Recover = (RecoverKind == CRK_AlwaysRecoverable) ||
2213 ((RecoverKind == CRK_Recoverable) &&
2214 CGM.getCodeGenOpts().SanitizeRecover);
2216 llvm::FunctionType *FnType =
2217 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
2218 llvm::AttrBuilder B;
2220 B.addAttribute(llvm::Attribute::NoReturn)
2221 .addAttribute(llvm::Attribute::NoUnwind);
2223 B.addAttribute(llvm::Attribute::UWTable);
2225 // Checks that have two variants use a suffix to differentiate them
2226 bool NeedsAbortSuffix = (RecoverKind != CRK_Unrecoverable) &&
2227 !CGM.getCodeGenOpts().SanitizeRecover;
2228 std::string FunctionName = ("__ubsan_handle_" + CheckName +
2229 (NeedsAbortSuffix? "_abort" : "")).str();
2231 CGM.CreateRuntimeFunction(FnType, FunctionName,
2232 llvm::AttributeSet::get(getLLVMContext(),
2233 llvm::AttributeSet::FunctionIndex,
2235 llvm::CallInst *HandlerCall = EmitNounwindRuntimeCall(Fn, Args);
2237 Builder.CreateBr(Cont);
2239 HandlerCall->setDoesNotReturn();
2240 Builder.CreateUnreachable();
2246 void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
2247 llvm::BasicBlock *Cont = createBasicBlock("cont");
2249 // If we're optimizing, collapse all calls to trap down to just one per
2250 // function to save on code size.
2251 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
2252 TrapBB = createBasicBlock("trap");
2253 Builder.CreateCondBr(Checked, Cont, TrapBB);
2255 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::trap);
2256 llvm::CallInst *TrapCall = Builder.CreateCall(F);
2257 TrapCall->setDoesNotReturn();
2258 TrapCall->setDoesNotThrow();
2259 Builder.CreateUnreachable();
2261 Builder.CreateCondBr(Checked, Cont, TrapBB);
2267 /// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
2268 /// array to pointer, return the array subexpression.
2269 static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
2270 // If this isn't just an array->pointer decay, bail out.
2271 const CastExpr *CE = dyn_cast<CastExpr>(E);
2272 if (CE == 0 || CE->getCastKind() != CK_ArrayToPointerDecay)
2275 // If this is a decay from variable width array, bail out.
2276 const Expr *SubExpr = CE->getSubExpr();
2277 if (SubExpr->getType()->isVariableArrayType())
2283 LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
2285 // The index must always be an integer, which is not an aggregate. Emit it.
2286 llvm::Value *Idx = EmitScalarExpr(E->getIdx());
2287 QualType IdxTy = E->getIdx()->getType();
2288 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
2290 if (SanOpts->Bounds)
2291 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
2293 // If the base is a vector type, then we are forming a vector element lvalue
2294 // with this subscript.
2295 if (E->getBase()->getType()->isVectorType()) {
2296 // Emit the vector as an lvalue to get its address.
2297 LValue LHS = EmitLValue(E->getBase());
2298 assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
2299 Idx = Builder.CreateIntCast(Idx, Int32Ty, IdxSigned, "vidx");
2300 return LValue::MakeVectorElt(LHS.getAddress(), Idx,
2301 E->getBase()->getType(), LHS.getAlignment());
2304 // Extend or truncate the index type to 32 or 64-bits.
2305 if (Idx->getType() != IntPtrTy)
2306 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
2308 // We know that the pointer points to a type of the correct size, unless the
2309 // size is a VLA or Objective-C interface.
2310 llvm::Value *Address = 0;
2311 CharUnits ArrayAlignment;
2312 if (const VariableArrayType *vla =
2313 getContext().getAsVariableArrayType(E->getType())) {
2314 // The base must be a pointer, which is not an aggregate. Emit
2315 // it. It needs to be emitted first in case it's what captures
2317 Address = EmitScalarExpr(E->getBase());
2319 // The element count here is the total number of non-VLA elements.
2320 llvm::Value *numElements = getVLASize(vla).first;
2322 // Effectively, the multiply by the VLA size is part of the GEP.
2323 // GEP indexes are signed, and scaling an index isn't permitted to
2324 // signed-overflow, so we use the same semantics for our explicit
2325 // multiply. We suppress this if overflow is not undefined behavior.
2326 if (getLangOpts().isSignedOverflowDefined()) {
2327 Idx = Builder.CreateMul(Idx, numElements);
2328 Address = Builder.CreateGEP(Address, Idx, "arrayidx");
2330 Idx = Builder.CreateNSWMul(Idx, numElements);
2331 Address = Builder.CreateInBoundsGEP(Address, Idx, "arrayidx");
2333 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
2334 // Indexing over an interface, as in "NSString *P; P[4];"
2335 llvm::Value *InterfaceSize =
2336 llvm::ConstantInt::get(Idx->getType(),
2337 getContext().getTypeSizeInChars(OIT).getQuantity());
2339 Idx = Builder.CreateMul(Idx, InterfaceSize);
2341 // The base must be a pointer, which is not an aggregate. Emit it.
2342 llvm::Value *Base = EmitScalarExpr(E->getBase());
2343 Address = EmitCastToVoidPtr(Base);
2344 Address = Builder.CreateGEP(Address, Idx, "arrayidx");
2345 Address = Builder.CreateBitCast(Address, Base->getType());
2346 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
2347 // If this is A[i] where A is an array, the frontend will have decayed the
2348 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
2349 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
2350 // "gep x, i" here. Emit one "gep A, 0, i".
2351 assert(Array->getType()->isArrayType() &&
2352 "Array to pointer decay must have array source type!");
2354 // For simple multidimensional array indexing, set the 'accessed' flag for
2355 // better bounds-checking of the base expression.
2356 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(Array))
2357 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
2359 ArrayLV = EmitLValue(Array);
2360 llvm::Value *ArrayPtr = ArrayLV.getAddress();
2361 llvm::Value *Zero = llvm::ConstantInt::get(Int32Ty, 0);
2362 llvm::Value *Args[] = { Zero, Idx };
2364 // Propagate the alignment from the array itself to the result.
2365 ArrayAlignment = ArrayLV.getAlignment();
2367 if (getLangOpts().isSignedOverflowDefined())
2368 Address = Builder.CreateGEP(ArrayPtr, Args, "arrayidx");
2370 Address = Builder.CreateInBoundsGEP(ArrayPtr, Args, "arrayidx");
2372 // The base must be a pointer, which is not an aggregate. Emit it.
2373 llvm::Value *Base = EmitScalarExpr(E->getBase());
2374 if (getLangOpts().isSignedOverflowDefined())
2375 Address = Builder.CreateGEP(Base, Idx, "arrayidx");
2377 Address = Builder.CreateInBoundsGEP(Base, Idx, "arrayidx");
2380 QualType T = E->getBase()->getType()->getPointeeType();
2381 assert(!T.isNull() &&
2382 "CodeGenFunction::EmitArraySubscriptExpr(): Illegal base type");
2385 // Limit the alignment to that of the result type.
2387 if (!ArrayAlignment.isZero()) {
2388 CharUnits Align = getContext().getTypeAlignInChars(T);
2389 ArrayAlignment = std::min(Align, ArrayAlignment);
2390 LV = MakeAddrLValue(Address, T, ArrayAlignment);
2392 LV = MakeNaturalAlignAddrLValue(Address, T);
2395 LV.getQuals().setAddressSpace(E->getBase()->getType().getAddressSpace());
2397 if (getLangOpts().ObjC1 &&
2398 getLangOpts().getGC() != LangOptions::NonGC) {
2399 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2400 setObjCGCLValueClass(getContext(), E, LV);
2406 llvm::Constant *GenerateConstantVector(CGBuilderTy &Builder,
2407 SmallVector<unsigned, 4> &Elts) {
2408 SmallVector<llvm::Constant*, 4> CElts;
2409 for (unsigned i = 0, e = Elts.size(); i != e; ++i)
2410 CElts.push_back(Builder.getInt32(Elts[i]));
2412 return llvm::ConstantVector::get(CElts);
2415 LValue CodeGenFunction::
2416 EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
2417 // Emit the base vector as an l-value.
2420 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
2422 // If it is a pointer to a vector, emit the address and form an lvalue with
2424 llvm::Value *Ptr = EmitScalarExpr(E->getBase());
2425 const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
2426 Base = MakeAddrLValue(Ptr, PT->getPointeeType());
2427 Base.getQuals().removeObjCGCAttr();
2428 } else if (E->getBase()->isGLValue()) {
2429 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
2430 // emit the base as an lvalue.
2431 assert(E->getBase()->getType()->isVectorType());
2432 Base = EmitLValue(E->getBase());
2434 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
2435 assert(E->getBase()->getType()->isVectorType() &&
2436 "Result must be a vector");
2437 llvm::Value *Vec = EmitScalarExpr(E->getBase());
2439 // Store the vector to memory (because LValue wants an address).
2440 llvm::Value *VecMem = CreateMemTemp(E->getBase()->getType());
2441 Builder.CreateStore(Vec, VecMem);
2442 Base = MakeAddrLValue(VecMem, E->getBase()->getType());
2446 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
2448 // Encode the element access list into a vector of unsigned indices.
2449 SmallVector<unsigned, 4> Indices;
2450 E->getEncodedElementAccess(Indices);
2452 if (Base.isSimple()) {
2453 llvm::Constant *CV = GenerateConstantVector(Builder, Indices);
2454 return LValue::MakeExtVectorElt(Base.getAddress(), CV, type,
2455 Base.getAlignment());
2457 assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
2459 llvm::Constant *BaseElts = Base.getExtVectorElts();
2460 SmallVector<llvm::Constant *, 4> CElts;
2462 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
2463 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
2464 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
2465 return LValue::MakeExtVectorElt(Base.getExtVectorAddr(), CV, type,
2466 Base.getAlignment());
2469 LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
2470 Expr *BaseExpr = E->getBase();
2472 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
2475 llvm::Value *Ptr = EmitScalarExpr(BaseExpr);
2476 QualType PtrTy = BaseExpr->getType()->getPointeeType();
2477 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Ptr, PtrTy);
2478 BaseLV = MakeNaturalAlignAddrLValue(Ptr, PtrTy);
2480 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
2482 NamedDecl *ND = E->getMemberDecl();
2483 if (FieldDecl *Field = dyn_cast<FieldDecl>(ND)) {
2484 LValue LV = EmitLValueForField(BaseLV, Field);
2485 setObjCGCLValueClass(getContext(), E, LV);
2489 if (VarDecl *VD = dyn_cast<VarDecl>(ND))
2490 return EmitGlobalVarDeclLValue(*this, E, VD);
2492 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
2493 return EmitFunctionDeclLValue(*this, E, FD);
2495 llvm_unreachable("Unhandled member declaration!");
2498 /// Given that we are currently emitting a lambda, emit an l-value for
2499 /// one of its members.
2500 LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
2501 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda());
2502 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent());
2503 QualType LambdaTagType =
2504 getContext().getTagDeclType(Field->getParent());
2505 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
2506 return EmitLValueForField(LambdaLV, Field);
2509 LValue CodeGenFunction::EmitLValueForField(LValue base,
2510 const FieldDecl *field) {
2511 if (field->isBitField()) {
2512 const CGRecordLayout &RL =
2513 CGM.getTypes().getCGRecordLayout(field->getParent());
2514 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
2515 llvm::Value *Addr = base.getAddress();
2516 unsigned Idx = RL.getLLVMFieldNo(field);
2518 // For structs, we GEP to the field that the record layout suggests.
2519 Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
2520 // Get the access type.
2521 llvm::Type *PtrTy = llvm::Type::getIntNPtrTy(
2522 getLLVMContext(), Info.StorageSize,
2523 CGM.getContext().getTargetAddressSpace(base.getType()));
2524 if (Addr->getType() != PtrTy)
2525 Addr = Builder.CreateBitCast(Addr, PtrTy);
2527 QualType fieldType =
2528 field->getType().withCVRQualifiers(base.getVRQualifiers());
2529 return LValue::MakeBitfield(Addr, Info, fieldType, base.getAlignment());
2532 const RecordDecl *rec = field->getParent();
2533 QualType type = field->getType();
2534 CharUnits alignment = getContext().getDeclAlign(field);
2536 // FIXME: It should be impossible to have an LValue without alignment for a
2538 if (!base.getAlignment().isZero())
2539 alignment = std::min(alignment, base.getAlignment());
2541 bool mayAlias = rec->hasAttr<MayAliasAttr>();
2543 llvm::Value *addr = base.getAddress();
2544 unsigned cvr = base.getVRQualifiers();
2545 bool TBAAPath = CGM.getCodeGenOpts().StructPathTBAA;
2546 if (rec->isUnion()) {
2547 // For unions, there is no pointer adjustment.
2548 assert(!type->isReferenceType() && "union has reference member");
2549 // TODO: handle path-aware TBAA for union.
2552 // For structs, we GEP to the field that the record layout suggests.
2553 unsigned idx = CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
2554 addr = Builder.CreateStructGEP(addr, idx, field->getName());
2556 // If this is a reference field, load the reference right now.
2557 if (const ReferenceType *refType = type->getAs<ReferenceType>()) {
2558 llvm::LoadInst *load = Builder.CreateLoad(addr, "ref");
2559 if (cvr & Qualifiers::Volatile) load->setVolatile(true);
2560 load->setAlignment(alignment.getQuantity());
2562 // Loading the reference will disable path-aware TBAA.
2564 if (CGM.shouldUseTBAA()) {
2567 tbaa = CGM.getTBAAInfo(getContext().CharTy);
2569 tbaa = CGM.getTBAAInfo(type);
2570 CGM.DecorateInstruction(load, tbaa);
2575 type = refType->getPointeeType();
2576 if (type->isIncompleteType())
2577 alignment = CharUnits();
2579 alignment = getContext().getTypeAlignInChars(type);
2580 cvr = 0; // qualifiers don't recursively apply to referencee
2584 // Make sure that the address is pointing to the right type. This is critical
2585 // for both unions and structs. A union needs a bitcast, a struct element
2586 // will need a bitcast if the LLVM type laid out doesn't match the desired
2588 addr = EmitBitCastOfLValueToProperType(*this, addr,
2589 CGM.getTypes().ConvertTypeForMem(type),
2592 if (field->hasAttr<AnnotateAttr>())
2593 addr = EmitFieldAnnotations(field, addr);
2595 LValue LV = MakeAddrLValue(addr, type, alignment);
2596 LV.getQuals().addCVRQualifiers(cvr);
2598 const ASTRecordLayout &Layout =
2599 getContext().getASTRecordLayout(field->getParent());
2600 // Set the base type to be the base type of the base LValue and
2601 // update offset to be relative to the base type.
2602 LV.setTBAABaseType(mayAlias ? getContext().CharTy : base.getTBAABaseType());
2603 LV.setTBAAOffset(mayAlias ? 0 : base.getTBAAOffset() +
2604 Layout.getFieldOffset(field->getFieldIndex()) /
2605 getContext().getCharWidth());
2608 // __weak attribute on a field is ignored.
2609 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
2610 LV.getQuals().removeObjCGCAttr();
2612 // Fields of may_alias structs act like 'char' for TBAA purposes.
2613 // FIXME: this should get propagated down through anonymous structs
2615 if (mayAlias && LV.getTBAAInfo())
2616 LV.setTBAAInfo(CGM.getTBAAInfo(getContext().CharTy));
2622 CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
2623 const FieldDecl *Field) {
2624 QualType FieldType = Field->getType();
2626 if (!FieldType->isReferenceType())
2627 return EmitLValueForField(Base, Field);
2629 const CGRecordLayout &RL =
2630 CGM.getTypes().getCGRecordLayout(Field->getParent());
2631 unsigned idx = RL.getLLVMFieldNo(Field);
2632 llvm::Value *V = Builder.CreateStructGEP(Base.getAddress(), idx);
2633 assert(!FieldType.getObjCGCAttr() && "fields cannot have GC attrs");
2635 // Make sure that the address is pointing to the right type. This is critical
2636 // for both unions and structs. A union needs a bitcast, a struct element
2637 // will need a bitcast if the LLVM type laid out doesn't match the desired
2639 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
2640 V = EmitBitCastOfLValueToProperType(*this, V, llvmType, Field->getName());
2642 CharUnits Alignment = getContext().getDeclAlign(Field);
2644 // FIXME: It should be impossible to have an LValue without alignment for a
2646 if (!Base.getAlignment().isZero())
2647 Alignment = std::min(Alignment, Base.getAlignment());
2649 return MakeAddrLValue(V, FieldType, Alignment);
2652 LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
2653 if (E->isFileScope()) {
2654 llvm::Value *GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
2655 return MakeAddrLValue(GlobalPtr, E->getType());
2657 if (E->getType()->isVariablyModifiedType())
2658 // make sure to emit the VLA size.
2659 EmitVariablyModifiedType(E->getType());
2661 llvm::Value *DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
2662 const Expr *InitExpr = E->getInitializer();
2663 LValue Result = MakeAddrLValue(DeclPtr, E->getType());
2665 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
2671 LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
2672 if (!E->isGLValue())
2673 // Initializing an aggregate temporary in C++11: T{...}.
2674 return EmitAggExprToLValue(E);
2676 // An lvalue initializer list must be initializing a reference.
2677 assert(E->getNumInits() == 1 && "reference init with multiple values");
2678 return EmitLValue(E->getInit(0));
2681 LValue CodeGenFunction::
2682 EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
2683 if (!expr->isGLValue()) {
2684 // ?: here should be an aggregate.
2685 assert(hasAggregateEvaluationKind(expr->getType()) &&
2686 "Unexpected conditional operator!");
2687 return EmitAggExprToLValue(expr);
2690 OpaqueValueMapping binding(*this, expr);
2692 const Expr *condExpr = expr->getCond();
2694 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
2695 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
2696 if (!CondExprBool) std::swap(live, dead);
2698 if (!ContainsLabel(dead))
2699 return EmitLValue(live);
2702 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
2703 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
2704 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
2706 ConditionalEvaluation eval(*this);
2707 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock);
2709 // Any temporaries created here are conditional.
2710 EmitBlock(lhsBlock);
2712 LValue lhs = EmitLValue(expr->getTrueExpr());
2715 if (!lhs.isSimple())
2716 return EmitUnsupportedLValue(expr, "conditional operator");
2718 lhsBlock = Builder.GetInsertBlock();
2719 Builder.CreateBr(contBlock);
2721 // Any temporaries created here are conditional.
2722 EmitBlock(rhsBlock);
2724 LValue rhs = EmitLValue(expr->getFalseExpr());
2726 if (!rhs.isSimple())
2727 return EmitUnsupportedLValue(expr, "conditional operator");
2728 rhsBlock = Builder.GetInsertBlock();
2730 EmitBlock(contBlock);
2732 llvm::PHINode *phi = Builder.CreatePHI(lhs.getAddress()->getType(), 2,
2734 phi->addIncoming(lhs.getAddress(), lhsBlock);
2735 phi->addIncoming(rhs.getAddress(), rhsBlock);
2736 return MakeAddrLValue(phi, expr->getType());
2739 /// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
2740 /// type. If the cast is to a reference, we can have the usual lvalue result,
2741 /// otherwise if a cast is needed by the code generator in an lvalue context,
2742 /// then it must mean that we need the address of an aggregate in order to
2743 /// access one of its members. This can happen for all the reasons that casts
2744 /// are permitted with aggregate result, including noop aggregate casts, and
2745 /// cast from scalar to union.
2746 LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
2747 switch (E->getCastKind()) {
2749 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
2752 llvm_unreachable("dependent cast kind in IR gen!");
2754 case CK_BuiltinFnToFnPtr:
2755 llvm_unreachable("builtin functions are handled elsewhere");
2757 // These two casts are currently treated as no-ops, although they could
2758 // potentially be real operations depending on the target's ABI.
2759 case CK_NonAtomicToAtomic:
2760 case CK_AtomicToNonAtomic:
2763 case CK_LValueToRValue:
2764 if (!E->getSubExpr()->Classify(getContext()).isPRValue()
2765 || E->getType()->isRecordType())
2766 return EmitLValue(E->getSubExpr());
2767 // Fall through to synthesize a temporary.
2770 case CK_ArrayToPointerDecay:
2771 case CK_FunctionToPointerDecay:
2772 case CK_NullToMemberPointer:
2773 case CK_NullToPointer:
2774 case CK_IntegralToPointer:
2775 case CK_PointerToIntegral:
2776 case CK_PointerToBoolean:
2777 case CK_VectorSplat:
2778 case CK_IntegralCast:
2779 case CK_IntegralToBoolean:
2780 case CK_IntegralToFloating:
2781 case CK_FloatingToIntegral:
2782 case CK_FloatingToBoolean:
2783 case CK_FloatingCast:
2784 case CK_FloatingRealToComplex:
2785 case CK_FloatingComplexToReal:
2786 case CK_FloatingComplexToBoolean:
2787 case CK_FloatingComplexCast:
2788 case CK_FloatingComplexToIntegralComplex:
2789 case CK_IntegralRealToComplex:
2790 case CK_IntegralComplexToReal:
2791 case CK_IntegralComplexToBoolean:
2792 case CK_IntegralComplexCast:
2793 case CK_IntegralComplexToFloatingComplex:
2794 case CK_DerivedToBaseMemberPointer:
2795 case CK_BaseToDerivedMemberPointer:
2796 case CK_MemberPointerToBoolean:
2797 case CK_ReinterpretMemberPointer:
2798 case CK_AnyPointerToBlockPointerCast:
2799 case CK_ARCProduceObject:
2800 case CK_ARCConsumeObject:
2801 case CK_ARCReclaimReturnedObject:
2802 case CK_ARCExtendBlockObject:
2803 case CK_CopyAndAutoreleaseBlockObject: {
2804 // These casts only produce lvalues when we're binding a reference to a
2805 // temporary realized from a (converted) pure rvalue. Emit the expression
2806 // as a value, copy it into a temporary, and return an lvalue referring to
2808 llvm::Value *V = CreateMemTemp(E->getType(), "ref.temp");
2809 EmitAnyExprToMem(E, V, E->getType().getQualifiers(), false);
2810 return MakeAddrLValue(V, E->getType());
2814 LValue LV = EmitLValue(E->getSubExpr());
2815 llvm::Value *V = LV.getAddress();
2816 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(E);
2817 return MakeAddrLValue(EmitDynamicCast(V, DCE), E->getType());
2820 case CK_ConstructorConversion:
2821 case CK_UserDefinedConversion:
2822 case CK_CPointerToObjCPointerCast:
2823 case CK_BlockPointerToObjCPointerCast:
2824 return EmitLValue(E->getSubExpr());
2826 case CK_UncheckedDerivedToBase:
2827 case CK_DerivedToBase: {
2828 const RecordType *DerivedClassTy =
2829 E->getSubExpr()->getType()->getAs<RecordType>();
2830 CXXRecordDecl *DerivedClassDecl =
2831 cast<CXXRecordDecl>(DerivedClassTy->getDecl());
2833 LValue LV = EmitLValue(E->getSubExpr());
2834 llvm::Value *This = LV.getAddress();
2836 // Perform the derived-to-base conversion
2838 GetAddressOfBaseClass(This, DerivedClassDecl,
2839 E->path_begin(), E->path_end(),
2840 /*NullCheckValue=*/false);
2842 return MakeAddrLValue(Base, E->getType());
2845 return EmitAggExprToLValue(E);
2846 case CK_BaseToDerived: {
2847 const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
2848 CXXRecordDecl *DerivedClassDecl =
2849 cast<CXXRecordDecl>(DerivedClassTy->getDecl());
2851 LValue LV = EmitLValue(E->getSubExpr());
2853 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
2854 // performed and the object is not of the derived type.
2855 if (SanitizePerformTypeCheck)
2856 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
2857 LV.getAddress(), E->getType());
2859 // Perform the base-to-derived conversion
2860 llvm::Value *Derived =
2861 GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
2862 E->path_begin(), E->path_end(),
2863 /*NullCheckValue=*/false);
2865 return MakeAddrLValue(Derived, E->getType());
2867 case CK_LValueBitCast: {
2868 // This must be a reinterpret_cast (or c-style equivalent).
2869 const ExplicitCastExpr *CE = cast<ExplicitCastExpr>(E);
2871 LValue LV = EmitLValue(E->getSubExpr());
2872 llvm::Value *V = Builder.CreateBitCast(LV.getAddress(),
2873 ConvertType(CE->getTypeAsWritten()));
2874 return MakeAddrLValue(V, E->getType());
2876 case CK_ObjCObjectLValueCast: {
2877 LValue LV = EmitLValue(E->getSubExpr());
2878 QualType ToType = getContext().getLValueReferenceType(E->getType());
2879 llvm::Value *V = Builder.CreateBitCast(LV.getAddress(),
2880 ConvertType(ToType));
2881 return MakeAddrLValue(V, E->getType());
2883 case CK_ZeroToOCLEvent:
2884 llvm_unreachable("NULL to OpenCL event lvalue cast is not valid");
2887 llvm_unreachable("Unhandled lvalue cast kind?");
2890 LValue CodeGenFunction::EmitNullInitializationLValue(
2891 const CXXScalarValueInitExpr *E) {
2892 QualType Ty = E->getType();
2893 LValue LV = MakeAddrLValue(CreateMemTemp(Ty), Ty);
2894 EmitNullInitialization(LV.getAddress(), Ty);
2898 LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
2899 assert(OpaqueValueMappingData::shouldBindAsLValue(e));
2900 return getOpaqueLValueMapping(e);
2903 LValue CodeGenFunction::EmitMaterializeTemporaryExpr(
2904 const MaterializeTemporaryExpr *E) {
2905 RValue RV = EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0);
2906 return MakeAddrLValue(RV.getScalarVal(), E->getType());
2909 RValue CodeGenFunction::EmitRValueForField(LValue LV,
2910 const FieldDecl *FD) {
2911 QualType FT = FD->getType();
2912 LValue FieldLV = EmitLValueForField(LV, FD);
2913 switch (getEvaluationKind(FT)) {
2915 return RValue::getComplex(EmitLoadOfComplex(FieldLV));
2917 return FieldLV.asAggregateRValue();
2919 return EmitLoadOfLValue(FieldLV);
2921 llvm_unreachable("bad evaluation kind");
2924 //===--------------------------------------------------------------------===//
2925 // Expression Emission
2926 //===--------------------------------------------------------------------===//
2928 RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
2929 ReturnValueSlot ReturnValue) {
2930 if (CGDebugInfo *DI = getDebugInfo()) {
2931 SourceLocation Loc = E->getLocStart();
2932 // Force column info to be generated so we can differentiate
2933 // multiple call sites on the same line in the debug info.
2934 const FunctionDecl* Callee = E->getDirectCallee();
2935 bool ForceColumnInfo = Callee && Callee->isInlineSpecified();
2936 DI->EmitLocation(Builder, Loc, ForceColumnInfo);
2939 // Builtins never have block type.
2940 if (E->getCallee()->getType()->isBlockPointerType())
2941 return EmitBlockCallExpr(E, ReturnValue);
2943 if (const CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(E))
2944 return EmitCXXMemberCallExpr(CE, ReturnValue);
2946 if (const CUDAKernelCallExpr *CE = dyn_cast<CUDAKernelCallExpr>(E))
2947 return EmitCUDAKernelCallExpr(CE, ReturnValue);
2949 const Decl *TargetDecl = E->getCalleeDecl();
2950 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl)) {
2951 if (unsigned builtinID = FD->getBuiltinID())
2952 return EmitBuiltinExpr(FD, builtinID, E);
2955 if (const CXXOperatorCallExpr *CE = dyn_cast<CXXOperatorCallExpr>(E))
2956 if (const CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(TargetDecl))
2957 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
2959 if (const CXXPseudoDestructorExpr *PseudoDtor
2960 = dyn_cast<CXXPseudoDestructorExpr>(E->getCallee()->IgnoreParens())) {
2961 QualType DestroyedType = PseudoDtor->getDestroyedType();
2962 if (getLangOpts().ObjCAutoRefCount &&
2963 DestroyedType->isObjCLifetimeType() &&
2964 (DestroyedType.getObjCLifetime() == Qualifiers::OCL_Strong ||
2965 DestroyedType.getObjCLifetime() == Qualifiers::OCL_Weak)) {
2966 // Automatic Reference Counting:
2967 // If the pseudo-expression names a retainable object with weak or
2968 // strong lifetime, the object shall be released.
2969 Expr *BaseExpr = PseudoDtor->getBase();
2970 llvm::Value *BaseValue = NULL;
2971 Qualifiers BaseQuals;
2973 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
2974 if (PseudoDtor->isArrow()) {
2975 BaseValue = EmitScalarExpr(BaseExpr);
2976 const PointerType *PTy = BaseExpr->getType()->getAs<PointerType>();
2977 BaseQuals = PTy->getPointeeType().getQualifiers();
2979 LValue BaseLV = EmitLValue(BaseExpr);
2980 BaseValue = BaseLV.getAddress();
2981 QualType BaseTy = BaseExpr->getType();
2982 BaseQuals = BaseTy.getQualifiers();
2985 switch (PseudoDtor->getDestroyedType().getObjCLifetime()) {
2986 case Qualifiers::OCL_None:
2987 case Qualifiers::OCL_ExplicitNone:
2988 case Qualifiers::OCL_Autoreleasing:
2991 case Qualifiers::OCL_Strong:
2992 EmitARCRelease(Builder.CreateLoad(BaseValue,
2993 PseudoDtor->getDestroyedType().isVolatileQualified()),
2994 ARCPreciseLifetime);
2997 case Qualifiers::OCL_Weak:
2998 EmitARCDestroyWeak(BaseValue);
3002 // C++ [expr.pseudo]p1:
3003 // The result shall only be used as the operand for the function call
3004 // operator (), and the result of such a call has type void. The only
3005 // effect is the evaluation of the postfix-expression before the dot or
3007 EmitScalarExpr(E->getCallee());
3010 return RValue::get(0);
3013 llvm::Value *Callee = EmitScalarExpr(E->getCallee());
3014 return EmitCall(E->getCallee()->getType(), Callee, ReturnValue,
3015 E->arg_begin(), E->arg_end(), TargetDecl);
3018 LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
3019 // Comma expressions just emit their LHS then their RHS as an l-value.
3020 if (E->getOpcode() == BO_Comma) {
3021 EmitIgnoredExpr(E->getLHS());
3022 EnsureInsertPoint();
3023 return EmitLValue(E->getRHS());
3026 if (E->getOpcode() == BO_PtrMemD ||
3027 E->getOpcode() == BO_PtrMemI)
3028 return EmitPointerToDataMemberBinaryExpr(E);
3030 assert(E->getOpcode() == BO_Assign && "unexpected binary l-value");
3032 // Note that in all of these cases, __block variables need the RHS
3033 // evaluated first just in case the variable gets moved by the RHS.
3035 switch (getEvaluationKind(E->getType())) {
3037 switch (E->getLHS()->getType().getObjCLifetime()) {
3038 case Qualifiers::OCL_Strong:
3039 return EmitARCStoreStrong(E, /*ignored*/ false).first;
3041 case Qualifiers::OCL_Autoreleasing:
3042 return EmitARCStoreAutoreleasing(E).first;
3044 // No reason to do any of these differently.
3045 case Qualifiers::OCL_None:
3046 case Qualifiers::OCL_ExplicitNone:
3047 case Qualifiers::OCL_Weak:
3051 RValue RV = EmitAnyExpr(E->getRHS());
3052 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
3053 EmitStoreThroughLValue(RV, LV);
3058 return EmitComplexAssignmentLValue(E);
3061 return EmitAggExprToLValue(E);
3063 llvm_unreachable("bad evaluation kind");
3066 LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
3067 RValue RV = EmitCallExpr(E);
3070 return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
3072 assert(E->getCallReturnType()->isReferenceType() &&
3073 "Can't have a scalar return unless the return type is a "
3076 return MakeAddrLValue(RV.getScalarVal(), E->getType());
3079 LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
3080 // FIXME: This shouldn't require another copy.
3081 return EmitAggExprToLValue(E);
3084 LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
3085 assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()
3086 && "binding l-value to type which needs a temporary");
3087 AggValueSlot Slot = CreateAggTemp(E->getType());
3088 EmitCXXConstructExpr(E, Slot);
3089 return MakeAddrLValue(Slot.getAddr(), E->getType());
3093 CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
3094 return MakeAddrLValue(EmitCXXTypeidExpr(E), E->getType());
3097 llvm::Value *CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
3098 return CGM.GetAddrOfUuidDescriptor(E);
3101 LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
3102 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType());
3106 CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
3107 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
3108 Slot.setExternallyDestructed();
3109 EmitAggExpr(E->getSubExpr(), Slot);
3110 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddr());
3111 return MakeAddrLValue(Slot.getAddr(), E->getType());
3115 CodeGenFunction::EmitLambdaLValue(const LambdaExpr *E) {
3116 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
3117 EmitLambdaExpr(E, Slot);
3118 return MakeAddrLValue(Slot.getAddr(), E->getType());
3121 LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
3122 RValue RV = EmitObjCMessageExpr(E);
3125 return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
3127 assert(E->getMethodDecl()->getResultType()->isReferenceType() &&
3128 "Can't have a scalar return unless the return type is a "
3131 return MakeAddrLValue(RV.getScalarVal(), E->getType());
3134 LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
3136 CGM.getObjCRuntime().GetSelector(*this, E->getSelector(), true);
3137 return MakeAddrLValue(V, E->getType());
3140 llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
3141 const ObjCIvarDecl *Ivar) {
3142 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
3145 LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
3146 llvm::Value *BaseValue,
3147 const ObjCIvarDecl *Ivar,
3148 unsigned CVRQualifiers) {
3149 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
3150 Ivar, CVRQualifiers);
3153 LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
3154 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
3155 llvm::Value *BaseValue = 0;
3156 const Expr *BaseExpr = E->getBase();
3157 Qualifiers BaseQuals;
3160 BaseValue = EmitScalarExpr(BaseExpr);
3161 ObjectTy = BaseExpr->getType()->getPointeeType();
3162 BaseQuals = ObjectTy.getQualifiers();
3164 LValue BaseLV = EmitLValue(BaseExpr);
3165 // FIXME: this isn't right for bitfields.
3166 BaseValue = BaseLV.getAddress();
3167 ObjectTy = BaseExpr->getType();
3168 BaseQuals = ObjectTy.getQualifiers();
3172 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
3173 BaseQuals.getCVRQualifiers());
3174 setObjCGCLValueClass(getContext(), E, LV);
3178 LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
3179 // Can only get l-value for message expression returning aggregate type
3180 RValue RV = EmitAnyExprToTemp(E);
3181 return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
3184 RValue CodeGenFunction::EmitCall(QualType CalleeType, llvm::Value *Callee,
3185 ReturnValueSlot ReturnValue,
3186 CallExpr::const_arg_iterator ArgBeg,
3187 CallExpr::const_arg_iterator ArgEnd,
3188 const Decl *TargetDecl) {
3189 // Get the actual function type. The callee type will always be a pointer to
3190 // function type or a block pointer type.
3191 assert(CalleeType->isFunctionPointerType() &&
3192 "Call must have function pointer type!");
3194 CalleeType = getContext().getCanonicalType(CalleeType);
3196 const FunctionType *FnType
3197 = cast<FunctionType>(cast<PointerType>(CalleeType)->getPointeeType());
3200 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), ArgBeg, ArgEnd);
3202 const CGFunctionInfo &FnInfo =
3203 CGM.getTypes().arrangeFreeFunctionCall(Args, FnType);
3206 // If the expression that denotes the called function has a type
3207 // that does not include a prototype, [the default argument
3208 // promotions are performed]. If the number of arguments does not
3209 // equal the number of parameters, the behavior is undefined. If
3210 // the function is defined with a type that includes a prototype,
3211 // and either the prototype ends with an ellipsis (, ...) or the
3212 // types of the arguments after promotion are not compatible with
3213 // the types of the parameters, the behavior is undefined. If the
3214 // function is defined with a type that does not include a
3215 // prototype, and the types of the arguments after promotion are
3216 // not compatible with those of the parameters after promotion,
3217 // the behavior is undefined [except in some trivial cases].
3218 // That is, in the general case, we should assume that a call
3219 // through an unprototyped function type works like a *non-variadic*
3220 // call. The way we make this work is to cast to the exact type
3221 // of the promoted arguments.
3222 if (isa<FunctionNoProtoType>(FnType)) {
3223 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
3224 CalleeTy = CalleeTy->getPointerTo();
3225 Callee = Builder.CreateBitCast(Callee, CalleeTy, "callee.knr.cast");
3228 return EmitCall(FnInfo, Callee, ReturnValue, Args, TargetDecl);
3231 LValue CodeGenFunction::
3232 EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
3234 if (E->getOpcode() == BO_PtrMemI)
3235 BaseV = EmitScalarExpr(E->getLHS());
3237 BaseV = EmitLValue(E->getLHS()).getAddress();
3239 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
3241 const MemberPointerType *MPT
3242 = E->getRHS()->getType()->getAs<MemberPointerType>();
3245 CGM.getCXXABI().EmitMemberDataPointerAddress(*this, BaseV, OffsetV, MPT);
3247 return MakeAddrLValue(AddV, MPT->getPointeeType());
3250 /// Given the address of a temporary variable, produce an r-value of
3252 RValue CodeGenFunction::convertTempToRValue(llvm::Value *addr,
3254 LValue lvalue = MakeNaturalAlignAddrLValue(addr, type);
3255 switch (getEvaluationKind(type)) {
3257 return RValue::getComplex(EmitLoadOfComplex(lvalue));
3259 return lvalue.asAggregateRValue();
3261 return RValue::get(EmitLoadOfScalar(lvalue));
3263 llvm_unreachable("bad evaluation kind");
3266 void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
3267 assert(Val->getType()->isFPOrFPVectorTy());
3268 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
3271 llvm::MDBuilder MDHelper(getLLVMContext());
3272 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
3274 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
3278 struct LValueOrRValue {
3284 static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
3285 const PseudoObjectExpr *E,
3287 AggValueSlot slot) {
3288 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
3290 // Find the result expression, if any.
3291 const Expr *resultExpr = E->getResultExpr();
3292 LValueOrRValue result;
3294 for (PseudoObjectExpr::const_semantics_iterator
3295 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
3296 const Expr *semantic = *i;
3298 // If this semantic expression is an opaque value, bind it
3299 // to the result of its source expression.
3300 if (const OpaqueValueExpr *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
3302 // If this is the result expression, we may need to evaluate
3303 // directly into the slot.
3304 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
3306 if (ov == resultExpr && ov->isRValue() && !forLValue &&
3307 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
3308 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
3310 LValue LV = CGF.MakeAddrLValue(slot.getAddr(), ov->getType());
3311 opaqueData = OVMA::bind(CGF, ov, LV);
3312 result.RV = slot.asRValue();
3314 // Otherwise, emit as normal.
3316 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
3318 // If this is the result, also evaluate the result now.
3319 if (ov == resultExpr) {
3321 result.LV = CGF.EmitLValue(ov);
3323 result.RV = CGF.EmitAnyExpr(ov, slot);
3327 opaques.push_back(opaqueData);
3329 // Otherwise, if the expression is the result, evaluate it
3330 // and remember the result.
3331 } else if (semantic == resultExpr) {
3333 result.LV = CGF.EmitLValue(semantic);
3335 result.RV = CGF.EmitAnyExpr(semantic, slot);
3337 // Otherwise, evaluate the expression in an ignored context.
3339 CGF.EmitIgnoredExpr(semantic);
3343 // Unbind all the opaques now.
3344 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
3345 opaques[i].unbind(CGF);
3350 RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
3351 AggValueSlot slot) {
3352 return emitPseudoObjectExpr(*this, E, false, slot).RV;
3355 LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
3356 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;