1 //===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
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 Objective-C code as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CGDebugInfo.h"
15 #include "CGObjCRuntime.h"
16 #include "CodeGenFunction.h"
17 #include "CodeGenModule.h"
18 #include "TargetInfo.h"
19 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/StmtObjC.h"
22 #include "clang/Basic/Diagnostic.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/DataLayout.h"
25 #include "llvm/InlineAsm.h"
26 using namespace clang;
27 using namespace CodeGen;
29 typedef llvm::PointerIntPair<llvm::Value*,1,bool> TryEmitResult;
31 tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e);
32 static RValue AdjustRelatedResultType(CodeGenFunction &CGF,
34 const ObjCMethodDecl *Method,
37 /// Given the address of a variable of pointer type, find the correct
38 /// null to store into it.
39 static llvm::Constant *getNullForVariable(llvm::Value *addr) {
41 cast<llvm::PointerType>(addr->getType())->getElementType();
42 return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(type));
45 /// Emits an instance of NSConstantString representing the object.
46 llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E)
49 CGM.getObjCRuntime().GenerateConstantString(E->getString());
50 // FIXME: This bitcast should just be made an invariant on the Runtime.
51 return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
54 /// EmitObjCBoxedExpr - This routine generates code to call
55 /// the appropriate expression boxing method. This will either be
56 /// one of +[NSNumber numberWith<Type>:], or +[NSString stringWithUTF8String:].
59 CodeGenFunction::EmitObjCBoxedExpr(const ObjCBoxedExpr *E) {
60 // Generate the correct selector for this literal's concrete type.
61 const Expr *SubExpr = E->getSubExpr();
63 const ObjCMethodDecl *BoxingMethod = E->getBoxingMethod();
64 assert(BoxingMethod && "BoxingMethod is null");
65 assert(BoxingMethod->isClassMethod() && "BoxingMethod must be a class method");
66 Selector Sel = BoxingMethod->getSelector();
68 // Generate a reference to the class pointer, which will be the receiver.
69 // Assumes that the method was introduced in the class that should be
70 // messaged (avoids pulling it out of the result type).
71 CGObjCRuntime &Runtime = CGM.getObjCRuntime();
72 const ObjCInterfaceDecl *ClassDecl = BoxingMethod->getClassInterface();
73 llvm::Value *Receiver = Runtime.GetClass(Builder, ClassDecl);
75 const ParmVarDecl *argDecl = *BoxingMethod->param_begin();
76 QualType ArgQT = argDecl->getType().getUnqualifiedType();
77 RValue RV = EmitAnyExpr(SubExpr);
81 RValue result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
82 BoxingMethod->getResultType(), Sel, Receiver, Args,
83 ClassDecl, BoxingMethod);
84 return Builder.CreateBitCast(result.getScalarVal(),
85 ConvertType(E->getType()));
88 llvm::Value *CodeGenFunction::EmitObjCCollectionLiteral(const Expr *E,
89 const ObjCMethodDecl *MethodWithObjects) {
90 ASTContext &Context = CGM.getContext();
91 const ObjCDictionaryLiteral *DLE = 0;
92 const ObjCArrayLiteral *ALE = dyn_cast<ObjCArrayLiteral>(E);
94 DLE = cast<ObjCDictionaryLiteral>(E);
96 // Compute the type of the array we're initializing.
97 uint64_t NumElements =
98 ALE ? ALE->getNumElements() : DLE->getNumElements();
99 llvm::APInt APNumElements(Context.getTypeSize(Context.getSizeType()),
101 QualType ElementType = Context.getObjCIdType().withConst();
102 QualType ElementArrayType
103 = Context.getConstantArrayType(ElementType, APNumElements,
104 ArrayType::Normal, /*IndexTypeQuals=*/0);
106 // Allocate the temporary array(s).
107 llvm::Value *Objects = CreateMemTemp(ElementArrayType, "objects");
108 llvm::Value *Keys = 0;
110 Keys = CreateMemTemp(ElementArrayType, "keys");
112 // Perform the actual initialialization of the array(s).
113 for (uint64_t i = 0; i < NumElements; i++) {
115 // Emit the initializer.
116 const Expr *Rhs = ALE->getElement(i);
117 LValue LV = LValue::MakeAddr(Builder.CreateStructGEP(Objects, i),
119 Context.getTypeAlignInChars(Rhs->getType()),
121 EmitScalarInit(Rhs, /*D=*/0, LV, /*capturedByInit=*/false);
123 // Emit the key initializer.
124 const Expr *Key = DLE->getKeyValueElement(i).Key;
125 LValue KeyLV = LValue::MakeAddr(Builder.CreateStructGEP(Keys, i),
127 Context.getTypeAlignInChars(Key->getType()),
129 EmitScalarInit(Key, /*D=*/0, KeyLV, /*capturedByInit=*/false);
131 // Emit the value initializer.
132 const Expr *Value = DLE->getKeyValueElement(i).Value;
133 LValue ValueLV = LValue::MakeAddr(Builder.CreateStructGEP(Objects, i),
135 Context.getTypeAlignInChars(Value->getType()),
137 EmitScalarInit(Value, /*D=*/0, ValueLV, /*capturedByInit=*/false);
141 // Generate the argument list.
143 ObjCMethodDecl::param_const_iterator PI = MethodWithObjects->param_begin();
144 const ParmVarDecl *argDecl = *PI++;
145 QualType ArgQT = argDecl->getType().getUnqualifiedType();
146 Args.add(RValue::get(Objects), ArgQT);
149 ArgQT = argDecl->getType().getUnqualifiedType();
150 Args.add(RValue::get(Keys), ArgQT);
153 ArgQT = argDecl->getType().getUnqualifiedType();
155 llvm::ConstantInt::get(CGM.getTypes().ConvertType(ArgQT), NumElements);
156 Args.add(RValue::get(Count), ArgQT);
158 // Generate a reference to the class pointer, which will be the receiver.
159 Selector Sel = MethodWithObjects->getSelector();
160 QualType ResultType = E->getType();
161 const ObjCObjectPointerType *InterfacePointerType
162 = ResultType->getAsObjCInterfacePointerType();
163 ObjCInterfaceDecl *Class
164 = InterfacePointerType->getObjectType()->getInterface();
165 CGObjCRuntime &Runtime = CGM.getObjCRuntime();
166 llvm::Value *Receiver = Runtime.GetClass(Builder, Class);
168 // Generate the message send.
170 = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
171 MethodWithObjects->getResultType(),
173 Receiver, Args, Class,
175 return Builder.CreateBitCast(result.getScalarVal(),
176 ConvertType(E->getType()));
179 llvm::Value *CodeGenFunction::EmitObjCArrayLiteral(const ObjCArrayLiteral *E) {
180 return EmitObjCCollectionLiteral(E, E->getArrayWithObjectsMethod());
183 llvm::Value *CodeGenFunction::EmitObjCDictionaryLiteral(
184 const ObjCDictionaryLiteral *E) {
185 return EmitObjCCollectionLiteral(E, E->getDictWithObjectsMethod());
189 llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) {
191 // Note that this implementation allows for non-constant strings to be passed
192 // as arguments to @selector(). Currently, the only thing preventing this
193 // behaviour is the type checking in the front end.
194 return CGM.getObjCRuntime().GetSelector(Builder, E->getSelector());
197 llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) {
198 // FIXME: This should pass the Decl not the name.
199 return CGM.getObjCRuntime().GenerateProtocolRef(Builder, E->getProtocol());
202 /// \brief Adjust the type of the result of an Objective-C message send
203 /// expression when the method has a related result type.
204 static RValue AdjustRelatedResultType(CodeGenFunction &CGF,
206 const ObjCMethodDecl *Method,
211 if (!Method->hasRelatedResultType() ||
212 CGF.getContext().hasSameType(ExpT, Method->getResultType()) ||
216 // We have applied a related result type. Cast the rvalue appropriately.
217 return RValue::get(CGF.Builder.CreateBitCast(Result.getScalarVal(),
218 CGF.ConvertType(ExpT)));
221 /// Decide whether to extend the lifetime of the receiver of a
222 /// returns-inner-pointer message.
224 shouldExtendReceiverForInnerPointerMessage(const ObjCMessageExpr *message) {
225 switch (message->getReceiverKind()) {
227 // For a normal instance message, we should extend unless the
228 // receiver is loaded from a variable with precise lifetime.
229 case ObjCMessageExpr::Instance: {
230 const Expr *receiver = message->getInstanceReceiver();
231 const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(receiver);
232 if (!ice || ice->getCastKind() != CK_LValueToRValue) return true;
233 receiver = ice->getSubExpr()->IgnoreParens();
235 // Only __strong variables.
236 if (receiver->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
239 // All ivars and fields have precise lifetime.
240 if (isa<MemberExpr>(receiver) || isa<ObjCIvarRefExpr>(receiver))
243 // Otherwise, check for variables.
244 const DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(ice->getSubExpr());
245 if (!declRef) return true;
246 const VarDecl *var = dyn_cast<VarDecl>(declRef->getDecl());
247 if (!var) return true;
249 // All variables have precise lifetime except local variables with
250 // automatic storage duration that aren't specially marked.
251 return (var->hasLocalStorage() &&
252 !var->hasAttr<ObjCPreciseLifetimeAttr>());
255 case ObjCMessageExpr::Class:
256 case ObjCMessageExpr::SuperClass:
257 // It's never necessary for class objects.
260 case ObjCMessageExpr::SuperInstance:
261 // We generally assume that 'self' lives throughout a method call.
265 llvm_unreachable("invalid receiver kind");
268 RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E,
269 ReturnValueSlot Return) {
270 // Only the lookup mechanism and first two arguments of the method
271 // implementation vary between runtimes. We can get the receiver and
272 // arguments in generic code.
274 bool isDelegateInit = E->isDelegateInitCall();
276 const ObjCMethodDecl *method = E->getMethodDecl();
278 // We don't retain the receiver in delegate init calls, and this is
279 // safe because the receiver value is always loaded from 'self',
280 // which we zero out. We don't want to Block_copy block receivers,
284 CGM.getLangOpts().ObjCAutoRefCount &&
286 method->hasAttr<NSConsumesSelfAttr>());
288 CGObjCRuntime &Runtime = CGM.getObjCRuntime();
289 bool isSuperMessage = false;
290 bool isClassMessage = false;
291 ObjCInterfaceDecl *OID = 0;
293 QualType ReceiverType;
294 llvm::Value *Receiver = 0;
295 switch (E->getReceiverKind()) {
296 case ObjCMessageExpr::Instance:
297 ReceiverType = E->getInstanceReceiver()->getType();
299 TryEmitResult ter = tryEmitARCRetainScalarExpr(*this,
300 E->getInstanceReceiver());
301 Receiver = ter.getPointer();
302 if (ter.getInt()) retainSelf = false;
304 Receiver = EmitScalarExpr(E->getInstanceReceiver());
307 case ObjCMessageExpr::Class: {
308 ReceiverType = E->getClassReceiver();
309 const ObjCObjectType *ObjTy = ReceiverType->getAs<ObjCObjectType>();
310 assert(ObjTy && "Invalid Objective-C class message send");
311 OID = ObjTy->getInterface();
312 assert(OID && "Invalid Objective-C class message send");
313 Receiver = Runtime.GetClass(Builder, OID);
314 isClassMessage = true;
318 case ObjCMessageExpr::SuperInstance:
319 ReceiverType = E->getSuperType();
320 Receiver = LoadObjCSelf();
321 isSuperMessage = true;
324 case ObjCMessageExpr::SuperClass:
325 ReceiverType = E->getSuperType();
326 Receiver = LoadObjCSelf();
327 isSuperMessage = true;
328 isClassMessage = true;
333 Receiver = EmitARCRetainNonBlock(Receiver);
335 // In ARC, we sometimes want to "extend the lifetime"
336 // (i.e. retain+autorelease) of receivers of returns-inner-pointer
338 if (getLangOpts().ObjCAutoRefCount && method &&
339 method->hasAttr<ObjCReturnsInnerPointerAttr>() &&
340 shouldExtendReceiverForInnerPointerMessage(E))
341 Receiver = EmitARCRetainAutorelease(ReceiverType, Receiver);
343 QualType ResultType =
344 method ? method->getResultType() : E->getType();
347 EmitCallArgs(Args, method, E->arg_begin(), E->arg_end());
349 // For delegate init calls in ARC, do an unsafe store of null into
350 // self. This represents the call taking direct ownership of that
351 // value. We have to do this after emitting the other call
352 // arguments because they might also reference self, but we don't
353 // have to worry about any of them modifying self because that would
354 // be an undefined read and write of an object in unordered
356 if (isDelegateInit) {
357 assert(getLangOpts().ObjCAutoRefCount &&
358 "delegate init calls should only be marked in ARC");
360 // Do an unsafe store of null into self.
361 llvm::Value *selfAddr =
362 LocalDeclMap[cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl()];
363 assert(selfAddr && "no self entry for a delegate init call?");
365 Builder.CreateStore(getNullForVariable(selfAddr), selfAddr);
369 if (isSuperMessage) {
370 // super is only valid in an Objective-C method
371 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
372 bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext());
373 result = Runtime.GenerateMessageSendSuper(*this, Return, ResultType,
375 OMD->getClassInterface(),
382 result = Runtime.GenerateMessageSend(*this, Return, ResultType,
388 // For delegate init calls in ARC, implicitly store the result of
389 // the call back into self. This takes ownership of the value.
390 if (isDelegateInit) {
391 llvm::Value *selfAddr =
392 LocalDeclMap[cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl()];
393 llvm::Value *newSelf = result.getScalarVal();
395 // The delegate return type isn't necessarily a matching type; in
396 // fact, it's quite likely to be 'id'.
398 cast<llvm::PointerType>(selfAddr->getType())->getElementType();
399 newSelf = Builder.CreateBitCast(newSelf, selfTy);
401 Builder.CreateStore(newSelf, selfAddr);
404 return AdjustRelatedResultType(*this, E->getType(), method, result);
408 struct FinishARCDealloc : EHScopeStack::Cleanup {
409 void Emit(CodeGenFunction &CGF, Flags flags) {
410 const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CGF.CurCodeDecl);
412 const ObjCImplDecl *impl = cast<ObjCImplDecl>(method->getDeclContext());
413 const ObjCInterfaceDecl *iface = impl->getClassInterface();
414 if (!iface->getSuperClass()) return;
416 bool isCategory = isa<ObjCCategoryImplDecl>(impl);
418 // Call [super dealloc] if we have a superclass.
419 llvm::Value *self = CGF.LoadObjCSelf();
422 CGF.CGM.getObjCRuntime().GenerateMessageSendSuper(CGF, ReturnValueSlot(),
423 CGF.getContext().VoidTy,
424 method->getSelector(),
428 /*is class msg*/ false,
435 /// StartObjCMethod - Begin emission of an ObjCMethod. This generates
436 /// the LLVM function and sets the other context used by
438 void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD,
439 const ObjCContainerDecl *CD,
440 SourceLocation StartLoc) {
441 FunctionArgList args;
442 // Check if we should generate debug info for this method.
443 if (!OMD->hasAttr<NoDebugAttr>())
444 maybeInitializeDebugInfo();
446 llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD);
448 const CGFunctionInfo &FI = CGM.getTypes().arrangeObjCMethodDeclaration(OMD);
449 CGM.SetInternalFunctionAttributes(OMD, Fn, FI);
451 args.push_back(OMD->getSelfDecl());
452 args.push_back(OMD->getCmdDecl());
454 for (ObjCMethodDecl::param_const_iterator PI = OMD->param_begin(),
455 E = OMD->param_end(); PI != E; ++PI)
460 StartFunction(OMD, OMD->getResultType(), Fn, FI, args, StartLoc);
462 // In ARC, certain methods get an extra cleanup.
463 if (CGM.getLangOpts().ObjCAutoRefCount &&
464 OMD->isInstanceMethod() &&
465 OMD->getSelector().isUnarySelector()) {
466 const IdentifierInfo *ident =
467 OMD->getSelector().getIdentifierInfoForSlot(0);
468 if (ident->isStr("dealloc"))
469 EHStack.pushCleanup<FinishARCDealloc>(getARCCleanupKind());
473 static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF,
474 LValue lvalue, QualType type);
476 /// Generate an Objective-C method. An Objective-C method is a C function with
477 /// its pointer, name, and types registered in the class struture.
478 void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) {
479 StartObjCMethod(OMD, OMD->getClassInterface(), OMD->getLocStart());
480 EmitStmt(OMD->getBody());
481 FinishFunction(OMD->getBodyRBrace());
484 /// emitStructGetterCall - Call the runtime function to load a property
485 /// into the return value slot.
486 static void emitStructGetterCall(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
487 bool isAtomic, bool hasStrong) {
488 ASTContext &Context = CGF.getContext();
491 CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(),
492 ivar, 0).getAddress();
494 // objc_copyStruct (ReturnValue, &structIvar,
495 // sizeof (Type of Ivar), isAtomic, false);
498 llvm::Value *dest = CGF.Builder.CreateBitCast(CGF.ReturnValue, CGF.VoidPtrTy);
499 args.add(RValue::get(dest), Context.VoidPtrTy);
501 src = CGF.Builder.CreateBitCast(src, CGF.VoidPtrTy);
502 args.add(RValue::get(src), Context.VoidPtrTy);
504 CharUnits size = CGF.getContext().getTypeSizeInChars(ivar->getType());
505 args.add(RValue::get(CGF.CGM.getSize(size)), Context.getSizeType());
506 args.add(RValue::get(CGF.Builder.getInt1(isAtomic)), Context.BoolTy);
507 args.add(RValue::get(CGF.Builder.getInt1(hasStrong)), Context.BoolTy);
509 llvm::Value *fn = CGF.CGM.getObjCRuntime().GetGetStructFunction();
510 CGF.EmitCall(CGF.getTypes().arrangeFreeFunctionCall(Context.VoidTy, args,
511 FunctionType::ExtInfo(),
513 fn, ReturnValueSlot(), args);
516 /// Determine whether the given architecture supports unaligned atomic
517 /// accesses. They don't have to be fast, just faster than a function
518 /// call and a mutex.
519 static bool hasUnalignedAtomics(llvm::Triple::ArchType arch) {
520 // FIXME: Allow unaligned atomic load/store on x86. (It is not
521 // currently supported by the backend.)
525 /// Return the maximum size that permits atomic accesses for the given
527 static CharUnits getMaxAtomicAccessSize(CodeGenModule &CGM,
528 llvm::Triple::ArchType arch) {
529 // ARM has 8-byte atomic accesses, but it's not clear whether we
530 // want to rely on them here.
532 // In the default case, just assume that any size up to a pointer is
533 // fine given adequate alignment.
534 return CharUnits::fromQuantity(CGM.PointerSizeInBytes);
538 class PropertyImplStrategy {
541 /// The 'native' strategy is to use the architecture's provided
542 /// reads and writes.
545 /// Use objc_setProperty and objc_getProperty.
548 /// Use objc_setProperty for the setter, but use expression
549 /// evaluation for the getter.
550 SetPropertyAndExpressionGet,
552 /// Use objc_copyStruct.
555 /// The 'expression' strategy is to emit normal assignment or
556 /// lvalue-to-rvalue expressions.
560 StrategyKind getKind() const { return StrategyKind(Kind); }
562 bool hasStrongMember() const { return HasStrong; }
563 bool isAtomic() const { return IsAtomic; }
564 bool isCopy() const { return IsCopy; }
566 CharUnits getIvarSize() const { return IvarSize; }
567 CharUnits getIvarAlignment() const { return IvarAlignment; }
569 PropertyImplStrategy(CodeGenModule &CGM,
570 const ObjCPropertyImplDecl *propImpl);
574 unsigned IsAtomic : 1;
576 unsigned HasStrong : 1;
579 CharUnits IvarAlignment;
583 /// Pick an implementation strategy for the given property synthesis.
584 PropertyImplStrategy::PropertyImplStrategy(CodeGenModule &CGM,
585 const ObjCPropertyImplDecl *propImpl) {
586 const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
587 ObjCPropertyDecl::SetterKind setterKind = prop->getSetterKind();
589 IsCopy = (setterKind == ObjCPropertyDecl::Copy);
590 IsAtomic = prop->isAtomic();
591 HasStrong = false; // doesn't matter here.
593 // Evaluate the ivar's size and alignment.
594 ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
595 QualType ivarType = ivar->getType();
596 llvm::tie(IvarSize, IvarAlignment)
597 = CGM.getContext().getTypeInfoInChars(ivarType);
599 // If we have a copy property, we always have to use getProperty/setProperty.
600 // TODO: we could actually use setProperty and an expression for non-atomics.
602 Kind = GetSetProperty;
607 if (setterKind == ObjCPropertyDecl::Retain) {
608 // In GC-only, there's nothing special that needs to be done.
609 if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
612 // In ARC, if the property is non-atomic, use expression emission,
613 // which translates to objc_storeStrong. This isn't required, but
614 // it's slightly nicer.
615 } else if (CGM.getLangOpts().ObjCAutoRefCount && !IsAtomic) {
616 // Using standard expression emission for the setter is only
617 // acceptable if the ivar is __strong, which won't be true if
618 // the property is annotated with __attribute__((NSObject)).
619 // TODO: falling all the way back to objc_setProperty here is
620 // just laziness, though; we could still use objc_storeStrong
621 // if we hacked it right.
622 if (ivarType.getObjCLifetime() == Qualifiers::OCL_Strong)
625 Kind = SetPropertyAndExpressionGet;
628 // Otherwise, we need to at least use setProperty. However, if
629 // the property isn't atomic, we can use normal expression
630 // emission for the getter.
631 } else if (!IsAtomic) {
632 Kind = SetPropertyAndExpressionGet;
635 // Otherwise, we have to use both setProperty and getProperty.
637 Kind = GetSetProperty;
642 // If we're not atomic, just use expression accesses.
648 // Properties on bitfield ivars need to be emitted using expression
649 // accesses even if they're nominally atomic.
650 if (ivar->isBitField()) {
655 // GC-qualified or ARC-qualified ivars need to be emitted as
656 // expressions. This actually works out to being atomic anyway,
657 // except for ARC __strong, but that should trigger the above code.
658 if (ivarType.hasNonTrivialObjCLifetime() ||
659 (CGM.getLangOpts().getGC() &&
660 CGM.getContext().getObjCGCAttrKind(ivarType))) {
665 // Compute whether the ivar has strong members.
666 if (CGM.getLangOpts().getGC())
667 if (const RecordType *recordType = ivarType->getAs<RecordType>())
668 HasStrong = recordType->getDecl()->hasObjectMember();
670 // We can never access structs with object members with a native
671 // access, because we need to use write barriers. This is what
672 // objc_copyStruct is for.
678 // Otherwise, this is target-dependent and based on the size and
679 // alignment of the ivar.
681 // If the size of the ivar is not a power of two, give up. We don't
682 // want to get into the business of doing compare-and-swaps.
683 if (!IvarSize.isPowerOfTwo()) {
688 llvm::Triple::ArchType arch =
689 CGM.getContext().getTargetInfo().getTriple().getArch();
691 // Most architectures require memory to fit within a single cache
692 // line, so the alignment has to be at least the size of the access.
693 // Otherwise we have to grab a lock.
694 if (IvarAlignment < IvarSize && !hasUnalignedAtomics(arch)) {
699 // If the ivar's size exceeds the architecture's maximum atomic
700 // access size, we have to use CopyStruct.
701 if (IvarSize > getMaxAtomicAccessSize(CGM, arch)) {
706 // Otherwise, we can use native loads and stores.
710 /// \brief Generate an Objective-C property getter function.
712 /// The given Decl must be an ObjCImplementationDecl. \@synthesize
713 /// is illegal within a category.
714 void CodeGenFunction::GenerateObjCGetter(ObjCImplementationDecl *IMP,
715 const ObjCPropertyImplDecl *PID) {
716 llvm::Constant *AtomicHelperFn =
717 GenerateObjCAtomicGetterCopyHelperFunction(PID);
718 const ObjCPropertyDecl *PD = PID->getPropertyDecl();
719 ObjCMethodDecl *OMD = PD->getGetterMethodDecl();
720 assert(OMD && "Invalid call to generate getter (empty method)");
721 StartObjCMethod(OMD, IMP->getClassInterface(), OMD->getLocStart());
723 generateObjCGetterBody(IMP, PID, OMD, AtomicHelperFn);
728 static bool hasTrivialGetExpr(const ObjCPropertyImplDecl *propImpl) {
729 const Expr *getter = propImpl->getGetterCXXConstructor();
730 if (!getter) return true;
732 // Sema only makes only of these when the ivar has a C++ class type,
733 // so the form is pretty constrained.
735 // If the property has a reference type, we might just be binding a
736 // reference, in which case the result will be a gl-value. We should
737 // treat this as a non-trivial operation.
738 if (getter->isGLValue())
741 // If we selected a trivial copy-constructor, we're okay.
742 if (const CXXConstructExpr *construct = dyn_cast<CXXConstructExpr>(getter))
743 return (construct->getConstructor()->isTrivial());
745 // The constructor might require cleanups (in which case it's never
747 assert(isa<ExprWithCleanups>(getter));
751 /// emitCPPObjectAtomicGetterCall - Call the runtime function to
752 /// copy the ivar into the resturn slot.
753 static void emitCPPObjectAtomicGetterCall(CodeGenFunction &CGF,
754 llvm::Value *returnAddr,
756 llvm::Constant *AtomicHelperFn) {
757 // objc_copyCppObjectAtomic (&returnSlot, &CppObjectIvar,
761 // The 1st argument is the return Slot.
762 args.add(RValue::get(returnAddr), CGF.getContext().VoidPtrTy);
764 // The 2nd argument is the address of the ivar.
765 llvm::Value *ivarAddr =
766 CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(),
767 CGF.LoadObjCSelf(), ivar, 0).getAddress();
768 ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
769 args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
771 // Third argument is the helper function.
772 args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
774 llvm::Value *copyCppAtomicObjectFn =
775 CGF.CGM.getObjCRuntime().GetCppAtomicObjectFunction();
776 CGF.EmitCall(CGF.getTypes().arrangeFreeFunctionCall(CGF.getContext().VoidTy,
778 FunctionType::ExtInfo(),
780 copyCppAtomicObjectFn, ReturnValueSlot(), args);
784 CodeGenFunction::generateObjCGetterBody(const ObjCImplementationDecl *classImpl,
785 const ObjCPropertyImplDecl *propImpl,
786 const ObjCMethodDecl *GetterMethodDecl,
787 llvm::Constant *AtomicHelperFn) {
788 // If there's a non-trivial 'get' expression, we just have to emit that.
789 if (!hasTrivialGetExpr(propImpl)) {
790 if (!AtomicHelperFn) {
791 ReturnStmt ret(SourceLocation(), propImpl->getGetterCXXConstructor(),
796 ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
797 emitCPPObjectAtomicGetterCall(*this, ReturnValue,
798 ivar, AtomicHelperFn);
803 const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
804 QualType propType = prop->getType();
805 ObjCMethodDecl *getterMethod = prop->getGetterMethodDecl();
807 ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
809 // Pick an implementation strategy.
810 PropertyImplStrategy strategy(CGM, propImpl);
811 switch (strategy.getKind()) {
812 case PropertyImplStrategy::Native: {
813 // We don't need to do anything for a zero-size struct.
814 if (strategy.getIvarSize().isZero())
817 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, 0);
819 // Currently, all atomic accesses have to be through integer
820 // types, so there's no point in trying to pick a prettier type.
821 llvm::Type *bitcastType =
822 llvm::Type::getIntNTy(getLLVMContext(),
823 getContext().toBits(strategy.getIvarSize()));
824 bitcastType = bitcastType->getPointerTo(); // addrspace 0 okay
826 // Perform an atomic load. This does not impose ordering constraints.
827 llvm::Value *ivarAddr = LV.getAddress();
828 ivarAddr = Builder.CreateBitCast(ivarAddr, bitcastType);
829 llvm::LoadInst *load = Builder.CreateLoad(ivarAddr, "load");
830 load->setAlignment(strategy.getIvarAlignment().getQuantity());
831 load->setAtomic(llvm::Unordered);
833 // Store that value into the return address. Doing this with a
834 // bitcast is likely to produce some pretty ugly IR, but it's not
835 // the *most* terrible thing in the world.
836 Builder.CreateStore(load, Builder.CreateBitCast(ReturnValue, bitcastType));
838 // Make sure we don't do an autorelease.
839 AutoreleaseResult = false;
843 case PropertyImplStrategy::GetSetProperty: {
844 llvm::Value *getPropertyFn =
845 CGM.getObjCRuntime().GetPropertyGetFunction();
846 if (!getPropertyFn) {
847 CGM.ErrorUnsupported(propImpl, "Obj-C getter requiring atomic copy");
851 // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true).
852 // FIXME: Can't this be simpler? This might even be worse than the
853 // corresponding gcc code.
855 Builder.CreateLoad(LocalDeclMap[getterMethod->getCmdDecl()], "cmd");
856 llvm::Value *self = Builder.CreateBitCast(LoadObjCSelf(), VoidPtrTy);
857 llvm::Value *ivarOffset =
858 EmitIvarOffset(classImpl->getClassInterface(), ivar);
861 args.add(RValue::get(self), getContext().getObjCIdType());
862 args.add(RValue::get(cmd), getContext().getObjCSelType());
863 args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
864 args.add(RValue::get(Builder.getInt1(strategy.isAtomic())),
865 getContext().BoolTy);
867 // FIXME: We shouldn't need to get the function info here, the
868 // runtime already should have computed it to build the function.
869 RValue RV = EmitCall(getTypes().arrangeFreeFunctionCall(propType, args,
870 FunctionType::ExtInfo(),
872 getPropertyFn, ReturnValueSlot(), args);
874 // We need to fix the type here. Ivars with copy & retain are
875 // always objects so we don't need to worry about complex or
877 RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(),
878 getTypes().ConvertType(getterMethod->getResultType())));
880 EmitReturnOfRValue(RV, propType);
882 // objc_getProperty does an autorelease, so we should suppress ours.
883 AutoreleaseResult = false;
888 case PropertyImplStrategy::CopyStruct:
889 emitStructGetterCall(*this, ivar, strategy.isAtomic(),
890 strategy.hasStrongMember());
893 case PropertyImplStrategy::Expression:
894 case PropertyImplStrategy::SetPropertyAndExpressionGet: {
895 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, 0);
897 QualType ivarType = ivar->getType();
898 if (ivarType->isAnyComplexType()) {
899 ComplexPairTy pair = LoadComplexFromAddr(LV.getAddress(),
900 LV.isVolatileQualified());
901 StoreComplexToAddr(pair, ReturnValue, LV.isVolatileQualified());
902 } else if (hasAggregateLLVMType(ivarType)) {
903 // The return value slot is guaranteed to not be aliased, but
904 // that's not necessarily the same as "on the stack", so
905 // we still potentially need objc_memmove_collectable.
906 EmitAggregateCopy(ReturnValue, LV.getAddress(), ivarType);
909 if (propType->isReferenceType()) {
910 value = LV.getAddress();
912 // We want to load and autoreleaseReturnValue ARC __weak ivars.
913 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
914 value = emitARCRetainLoadOfScalar(*this, LV, ivarType);
916 // Otherwise we want to do a simple load, suppressing the
917 // final autorelease.
919 value = EmitLoadOfLValue(LV).getScalarVal();
920 AutoreleaseResult = false;
923 value = Builder.CreateBitCast(value, ConvertType(propType));
924 value = Builder.CreateBitCast(value,
925 ConvertType(GetterMethodDecl->getResultType()));
928 EmitReturnOfRValue(RValue::get(value), propType);
934 llvm_unreachable("bad @property implementation strategy!");
937 /// emitStructSetterCall - Call the runtime function to store the value
938 /// from the first formal parameter into the given ivar.
939 static void emitStructSetterCall(CodeGenFunction &CGF, ObjCMethodDecl *OMD,
940 ObjCIvarDecl *ivar) {
941 // objc_copyStruct (&structIvar, &Arg,
942 // sizeof (struct something), true, false);
945 // The first argument is the address of the ivar.
946 llvm::Value *ivarAddr = CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(),
947 CGF.LoadObjCSelf(), ivar, 0)
949 ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
950 args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
952 // The second argument is the address of the parameter variable.
953 ParmVarDecl *argVar = *OMD->param_begin();
954 DeclRefExpr argRef(argVar, false, argVar->getType().getNonReferenceType(),
955 VK_LValue, SourceLocation());
956 llvm::Value *argAddr = CGF.EmitLValue(&argRef).getAddress();
957 argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
958 args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);
960 // The third argument is the sizeof the type.
962 CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(ivar->getType()));
963 args.add(RValue::get(size), CGF.getContext().getSizeType());
965 // The fourth argument is the 'isAtomic' flag.
966 args.add(RValue::get(CGF.Builder.getTrue()), CGF.getContext().BoolTy);
968 // The fifth argument is the 'hasStrong' flag.
969 // FIXME: should this really always be false?
970 args.add(RValue::get(CGF.Builder.getFalse()), CGF.getContext().BoolTy);
972 llvm::Value *copyStructFn = CGF.CGM.getObjCRuntime().GetSetStructFunction();
973 CGF.EmitCall(CGF.getTypes().arrangeFreeFunctionCall(CGF.getContext().VoidTy,
975 FunctionType::ExtInfo(),
977 copyStructFn, ReturnValueSlot(), args);
980 /// emitCPPObjectAtomicSetterCall - Call the runtime function to store
981 /// the value from the first formal parameter into the given ivar, using
982 /// the Cpp API for atomic Cpp objects with non-trivial copy assignment.
983 static void emitCPPObjectAtomicSetterCall(CodeGenFunction &CGF,
986 llvm::Constant *AtomicHelperFn) {
987 // objc_copyCppObjectAtomic (&CppObjectIvar, &Arg,
991 // The first argument is the address of the ivar.
992 llvm::Value *ivarAddr =
993 CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(),
994 CGF.LoadObjCSelf(), ivar, 0).getAddress();
995 ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
996 args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
998 // The second argument is the address of the parameter variable.
999 ParmVarDecl *argVar = *OMD->param_begin();
1000 DeclRefExpr argRef(argVar, false, argVar->getType().getNonReferenceType(),
1001 VK_LValue, SourceLocation());
1002 llvm::Value *argAddr = CGF.EmitLValue(&argRef).getAddress();
1003 argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
1004 args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);
1006 // Third argument is the helper function.
1007 args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
1009 llvm::Value *copyCppAtomicObjectFn =
1010 CGF.CGM.getObjCRuntime().GetCppAtomicObjectFunction();
1011 CGF.EmitCall(CGF.getTypes().arrangeFreeFunctionCall(CGF.getContext().VoidTy,
1013 FunctionType::ExtInfo(),
1015 copyCppAtomicObjectFn, ReturnValueSlot(), args);
1021 static bool hasTrivialSetExpr(const ObjCPropertyImplDecl *PID) {
1022 Expr *setter = PID->getSetterCXXAssignment();
1023 if (!setter) return true;
1025 // Sema only makes only of these when the ivar has a C++ class type,
1026 // so the form is pretty constrained.
1028 // An operator call is trivial if the function it calls is trivial.
1029 // This also implies that there's nothing non-trivial going on with
1030 // the arguments, because operator= can only be trivial if it's a
1031 // synthesized assignment operator and therefore both parameters are
1033 if (CallExpr *call = dyn_cast<CallExpr>(setter)) {
1034 if (const FunctionDecl *callee
1035 = dyn_cast_or_null<FunctionDecl>(call->getCalleeDecl()))
1036 if (callee->isTrivial())
1041 assert(isa<ExprWithCleanups>(setter));
1045 static bool UseOptimizedSetter(CodeGenModule &CGM) {
1046 if (CGM.getLangOpts().getGC() != LangOptions::NonGC)
1048 return CGM.getLangOpts().ObjCRuntime.hasOptimizedSetter();
1052 CodeGenFunction::generateObjCSetterBody(const ObjCImplementationDecl *classImpl,
1053 const ObjCPropertyImplDecl *propImpl,
1054 llvm::Constant *AtomicHelperFn) {
1055 const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
1056 ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
1057 ObjCMethodDecl *setterMethod = prop->getSetterMethodDecl();
1059 // Just use the setter expression if Sema gave us one and it's
1061 if (!hasTrivialSetExpr(propImpl)) {
1062 if (!AtomicHelperFn)
1063 // If non-atomic, assignment is called directly.
1064 EmitStmt(propImpl->getSetterCXXAssignment());
1066 // If atomic, assignment is called via a locking api.
1067 emitCPPObjectAtomicSetterCall(*this, setterMethod, ivar,
1072 PropertyImplStrategy strategy(CGM, propImpl);
1073 switch (strategy.getKind()) {
1074 case PropertyImplStrategy::Native: {
1075 // We don't need to do anything for a zero-size struct.
1076 if (strategy.getIvarSize().isZero())
1079 llvm::Value *argAddr = LocalDeclMap[*setterMethod->param_begin()];
1082 EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, /*quals*/ 0);
1083 llvm::Value *ivarAddr = ivarLValue.getAddress();
1085 // Currently, all atomic accesses have to be through integer
1086 // types, so there's no point in trying to pick a prettier type.
1087 llvm::Type *bitcastType =
1088 llvm::Type::getIntNTy(getLLVMContext(),
1089 getContext().toBits(strategy.getIvarSize()));
1090 bitcastType = bitcastType->getPointerTo(); // addrspace 0 okay
1092 // Cast both arguments to the chosen operation type.
1093 argAddr = Builder.CreateBitCast(argAddr, bitcastType);
1094 ivarAddr = Builder.CreateBitCast(ivarAddr, bitcastType);
1096 // This bitcast load is likely to cause some nasty IR.
1097 llvm::Value *load = Builder.CreateLoad(argAddr);
1099 // Perform an atomic store. There are no memory ordering requirements.
1100 llvm::StoreInst *store = Builder.CreateStore(load, ivarAddr);
1101 store->setAlignment(strategy.getIvarAlignment().getQuantity());
1102 store->setAtomic(llvm::Unordered);
1106 case PropertyImplStrategy::GetSetProperty:
1107 case PropertyImplStrategy::SetPropertyAndExpressionGet: {
1109 llvm::Value *setOptimizedPropertyFn = 0;
1110 llvm::Value *setPropertyFn = 0;
1111 if (UseOptimizedSetter(CGM)) {
1112 // 10.8 and iOS 6.0 code and GC is off
1113 setOptimizedPropertyFn =
1114 CGM.getObjCRuntime()
1115 .GetOptimizedPropertySetFunction(strategy.isAtomic(),
1117 if (!setOptimizedPropertyFn) {
1118 CGM.ErrorUnsupported(propImpl, "Obj-C optimized setter - NYI");
1123 setPropertyFn = CGM.getObjCRuntime().GetPropertySetFunction();
1124 if (!setPropertyFn) {
1125 CGM.ErrorUnsupported(propImpl, "Obj-C setter requiring atomic copy");
1130 // Emit objc_setProperty((id) self, _cmd, offset, arg,
1131 // <is-atomic>, <is-copy>).
1133 Builder.CreateLoad(LocalDeclMap[setterMethod->getCmdDecl()]);
1135 Builder.CreateBitCast(LoadObjCSelf(), VoidPtrTy);
1136 llvm::Value *ivarOffset =
1137 EmitIvarOffset(classImpl->getClassInterface(), ivar);
1138 llvm::Value *arg = LocalDeclMap[*setterMethod->param_begin()];
1139 arg = Builder.CreateBitCast(Builder.CreateLoad(arg, "arg"), VoidPtrTy);
1142 args.add(RValue::get(self), getContext().getObjCIdType());
1143 args.add(RValue::get(cmd), getContext().getObjCSelType());
1144 if (setOptimizedPropertyFn) {
1145 args.add(RValue::get(arg), getContext().getObjCIdType());
1146 args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
1147 EmitCall(getTypes().arrangeFreeFunctionCall(getContext().VoidTy, args,
1148 FunctionType::ExtInfo(),
1150 setOptimizedPropertyFn, ReturnValueSlot(), args);
1152 args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
1153 args.add(RValue::get(arg), getContext().getObjCIdType());
1154 args.add(RValue::get(Builder.getInt1(strategy.isAtomic())),
1155 getContext().BoolTy);
1156 args.add(RValue::get(Builder.getInt1(strategy.isCopy())),
1157 getContext().BoolTy);
1158 // FIXME: We shouldn't need to get the function info here, the runtime
1159 // already should have computed it to build the function.
1160 EmitCall(getTypes().arrangeFreeFunctionCall(getContext().VoidTy, args,
1161 FunctionType::ExtInfo(),
1163 setPropertyFn, ReturnValueSlot(), args);
1169 case PropertyImplStrategy::CopyStruct:
1170 emitStructSetterCall(*this, setterMethod, ivar);
1173 case PropertyImplStrategy::Expression:
1177 // Otherwise, fake up some ASTs and emit a normal assignment.
1178 ValueDecl *selfDecl = setterMethod->getSelfDecl();
1179 DeclRefExpr self(selfDecl, false, selfDecl->getType(),
1180 VK_LValue, SourceLocation());
1181 ImplicitCastExpr selfLoad(ImplicitCastExpr::OnStack,
1182 selfDecl->getType(), CK_LValueToRValue, &self,
1184 ObjCIvarRefExpr ivarRef(ivar, ivar->getType().getNonReferenceType(),
1185 SourceLocation(), &selfLoad, true, true);
1187 ParmVarDecl *argDecl = *setterMethod->param_begin();
1188 QualType argType = argDecl->getType().getNonReferenceType();
1189 DeclRefExpr arg(argDecl, false, argType, VK_LValue, SourceLocation());
1190 ImplicitCastExpr argLoad(ImplicitCastExpr::OnStack,
1191 argType.getUnqualifiedType(), CK_LValueToRValue,
1194 // The property type can differ from the ivar type in some situations with
1195 // Objective-C pointer types, we can always bit cast the RHS in these cases.
1196 // The following absurdity is just to ensure well-formed IR.
1197 CastKind argCK = CK_NoOp;
1198 if (ivarRef.getType()->isObjCObjectPointerType()) {
1199 if (argLoad.getType()->isObjCObjectPointerType())
1201 else if (argLoad.getType()->isBlockPointerType())
1202 argCK = CK_BlockPointerToObjCPointerCast;
1204 argCK = CK_CPointerToObjCPointerCast;
1205 } else if (ivarRef.getType()->isBlockPointerType()) {
1206 if (argLoad.getType()->isBlockPointerType())
1209 argCK = CK_AnyPointerToBlockPointerCast;
1210 } else if (ivarRef.getType()->isPointerType()) {
1213 ImplicitCastExpr argCast(ImplicitCastExpr::OnStack,
1214 ivarRef.getType(), argCK, &argLoad,
1216 Expr *finalArg = &argLoad;
1217 if (!getContext().hasSameUnqualifiedType(ivarRef.getType(),
1219 finalArg = &argCast;
1222 BinaryOperator assign(&ivarRef, finalArg, BO_Assign,
1223 ivarRef.getType(), VK_RValue, OK_Ordinary,
1224 SourceLocation(), false);
1228 /// \brief Generate an Objective-C property setter function.
1230 /// The given Decl must be an ObjCImplementationDecl. \@synthesize
1231 /// is illegal within a category.
1232 void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP,
1233 const ObjCPropertyImplDecl *PID) {
1234 llvm::Constant *AtomicHelperFn =
1235 GenerateObjCAtomicSetterCopyHelperFunction(PID);
1236 const ObjCPropertyDecl *PD = PID->getPropertyDecl();
1237 ObjCMethodDecl *OMD = PD->getSetterMethodDecl();
1238 assert(OMD && "Invalid call to generate setter (empty method)");
1239 StartObjCMethod(OMD, IMP->getClassInterface(), OMD->getLocStart());
1241 generateObjCSetterBody(IMP, PID, AtomicHelperFn);
1247 struct DestroyIvar : EHScopeStack::Cleanup {
1250 const ObjCIvarDecl *ivar;
1251 CodeGenFunction::Destroyer *destroyer;
1252 bool useEHCleanupForArray;
1254 DestroyIvar(llvm::Value *addr, const ObjCIvarDecl *ivar,
1255 CodeGenFunction::Destroyer *destroyer,
1256 bool useEHCleanupForArray)
1257 : addr(addr), ivar(ivar), destroyer(destroyer),
1258 useEHCleanupForArray(useEHCleanupForArray) {}
1260 void Emit(CodeGenFunction &CGF, Flags flags) {
1262 = CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), addr, ivar, /*CVR*/ 0);
1263 CGF.emitDestroy(lvalue.getAddress(), ivar->getType(), destroyer,
1264 flags.isForNormalCleanup() && useEHCleanupForArray);
1269 /// Like CodeGenFunction::destroyARCStrong, but do it with a call.
1270 static void destroyARCStrongWithStore(CodeGenFunction &CGF,
1273 llvm::Value *null = getNullForVariable(addr);
1274 CGF.EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
1277 static void emitCXXDestructMethod(CodeGenFunction &CGF,
1278 ObjCImplementationDecl *impl) {
1279 CodeGenFunction::RunCleanupsScope scope(CGF);
1281 llvm::Value *self = CGF.LoadObjCSelf();
1283 const ObjCInterfaceDecl *iface = impl->getClassInterface();
1284 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
1285 ivar; ivar = ivar->getNextIvar()) {
1286 QualType type = ivar->getType();
1288 // Check whether the ivar is a destructible type.
1289 QualType::DestructionKind dtorKind = type.isDestructedType();
1290 if (!dtorKind) continue;
1292 CodeGenFunction::Destroyer *destroyer = 0;
1294 // Use a call to objc_storeStrong to destroy strong ivars, for the
1295 // general benefit of the tools.
1296 if (dtorKind == QualType::DK_objc_strong_lifetime) {
1297 destroyer = destroyARCStrongWithStore;
1299 // Otherwise use the default for the destruction kind.
1301 destroyer = CGF.getDestroyer(dtorKind);
1304 CleanupKind cleanupKind = CGF.getCleanupKind(dtorKind);
1306 CGF.EHStack.pushCleanup<DestroyIvar>(cleanupKind, self, ivar, destroyer,
1307 cleanupKind & EHCleanup);
1310 assert(scope.requiresCleanups() && "nothing to do in .cxx_destruct?");
1313 void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP,
1316 MD->createImplicitParams(CGM.getContext(), IMP->getClassInterface());
1317 StartObjCMethod(MD, IMP->getClassInterface(), MD->getLocStart());
1319 // Emit .cxx_construct.
1321 // Suppress the final autorelease in ARC.
1322 AutoreleaseResult = false;
1324 SmallVector<CXXCtorInitializer *, 8> IvarInitializers;
1325 for (ObjCImplementationDecl::init_const_iterator B = IMP->init_begin(),
1326 E = IMP->init_end(); B != E; ++B) {
1327 CXXCtorInitializer *IvarInit = (*B);
1328 FieldDecl *Field = IvarInit->getAnyMember();
1329 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field);
1330 LValue LV = EmitLValueForIvar(TypeOfSelfObject(),
1331 LoadObjCSelf(), Ivar, 0);
1332 EmitAggExpr(IvarInit->getInit(),
1333 AggValueSlot::forLValue(LV, AggValueSlot::IsDestructed,
1334 AggValueSlot::DoesNotNeedGCBarriers,
1335 AggValueSlot::IsNotAliased));
1337 // constructor returns 'self'.
1338 CodeGenTypes &Types = CGM.getTypes();
1339 QualType IdTy(CGM.getContext().getObjCIdType());
1340 llvm::Value *SelfAsId =
1341 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy));
1342 EmitReturnOfRValue(RValue::get(SelfAsId), IdTy);
1344 // Emit .cxx_destruct.
1346 emitCXXDestructMethod(*this, IMP);
1351 bool CodeGenFunction::IndirectObjCSetterArg(const CGFunctionInfo &FI) {
1352 CGFunctionInfo::const_arg_iterator it = FI.arg_begin();
1354 const ABIArgInfo &AI = it->info;
1355 // FIXME. Is this sufficient check?
1356 return (AI.getKind() == ABIArgInfo::Indirect);
1359 bool CodeGenFunction::IvarTypeWithAggrGCObjects(QualType Ty) {
1360 if (CGM.getLangOpts().getGC() == LangOptions::NonGC)
1362 if (const RecordType *FDTTy = Ty.getTypePtr()->getAs<RecordType>())
1363 return FDTTy->getDecl()->hasObjectMember();
1367 llvm::Value *CodeGenFunction::LoadObjCSelf() {
1368 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
1369 return Builder.CreateLoad(LocalDeclMap[OMD->getSelfDecl()], "self");
1372 QualType CodeGenFunction::TypeOfSelfObject() {
1373 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
1374 ImplicitParamDecl *selfDecl = OMD->getSelfDecl();
1375 const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>(
1376 getContext().getCanonicalType(selfDecl->getType()));
1377 return PTy->getPointeeType();
1380 void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){
1381 llvm::Constant *EnumerationMutationFn =
1382 CGM.getObjCRuntime().EnumerationMutationFunction();
1384 if (!EnumerationMutationFn) {
1385 CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime");
1389 CGDebugInfo *DI = getDebugInfo();
1391 DI->EmitLexicalBlockStart(Builder, S.getSourceRange().getBegin());
1393 // The local variable comes into scope immediately.
1394 AutoVarEmission variable = AutoVarEmission::invalid();
1395 if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement()))
1396 variable = EmitAutoVarAlloca(*cast<VarDecl>(SD->getSingleDecl()));
1398 JumpDest LoopEnd = getJumpDestInCurrentScope("forcoll.end");
1400 // Fast enumeration state.
1401 QualType StateTy = CGM.getObjCFastEnumerationStateType();
1402 llvm::Value *StatePtr = CreateMemTemp(StateTy, "state.ptr");
1403 EmitNullInitialization(StatePtr, StateTy);
1405 // Number of elements in the items array.
1406 static const unsigned NumItems = 16;
1408 // Fetch the countByEnumeratingWithState:objects:count: selector.
1409 IdentifierInfo *II[] = {
1410 &CGM.getContext().Idents.get("countByEnumeratingWithState"),
1411 &CGM.getContext().Idents.get("objects"),
1412 &CGM.getContext().Idents.get("count")
1414 Selector FastEnumSel =
1415 CGM.getContext().Selectors.getSelector(llvm::array_lengthof(II), &II[0]);
1418 getContext().getConstantArrayType(getContext().getObjCIdType(),
1419 llvm::APInt(32, NumItems),
1420 ArrayType::Normal, 0);
1421 llvm::Value *ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr");
1423 // Emit the collection pointer. In ARC, we do a retain.
1424 llvm::Value *Collection;
1425 if (getLangOpts().ObjCAutoRefCount) {
1426 Collection = EmitARCRetainScalarExpr(S.getCollection());
1428 // Enter a cleanup to do the release.
1429 EmitObjCConsumeObject(S.getCollection()->getType(), Collection);
1431 Collection = EmitScalarExpr(S.getCollection());
1434 // The 'continue' label needs to appear within the cleanup for the
1435 // collection object.
1436 JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next");
1438 // Send it our message:
1441 // The first argument is a temporary of the enumeration-state type.
1442 Args.add(RValue::get(StatePtr), getContext().getPointerType(StateTy));
1444 // The second argument is a temporary array with space for NumItems
1445 // pointers. We'll actually be loading elements from the array
1446 // pointer written into the control state; this buffer is so that
1447 // collections that *aren't* backed by arrays can still queue up
1448 // batches of elements.
1449 Args.add(RValue::get(ItemsPtr), getContext().getPointerType(ItemsTy));
1451 // The third argument is the capacity of that temporary array.
1452 llvm::Type *UnsignedLongLTy = ConvertType(getContext().UnsignedLongTy);
1453 llvm::Constant *Count = llvm::ConstantInt::get(UnsignedLongLTy, NumItems);
1454 Args.add(RValue::get(Count), getContext().UnsignedLongTy);
1456 // Start the enumeration.
1458 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
1459 getContext().UnsignedLongTy,
1463 // The initial number of objects that were returned in the buffer.
1464 llvm::Value *initialBufferLimit = CountRV.getScalarVal();
1466 llvm::BasicBlock *EmptyBB = createBasicBlock("forcoll.empty");
1467 llvm::BasicBlock *LoopInitBB = createBasicBlock("forcoll.loopinit");
1469 llvm::Value *zero = llvm::Constant::getNullValue(UnsignedLongLTy);
1471 // If the limit pointer was zero to begin with, the collection is
1472 // empty; skip all this.
1473 Builder.CreateCondBr(Builder.CreateICmpEQ(initialBufferLimit, zero, "iszero"),
1474 EmptyBB, LoopInitBB);
1476 // Otherwise, initialize the loop.
1477 EmitBlock(LoopInitBB);
1479 // Save the initial mutations value. This is the value at an
1480 // address that was written into the state object by
1481 // countByEnumeratingWithState:objects:count:.
1482 llvm::Value *StateMutationsPtrPtr =
1483 Builder.CreateStructGEP(StatePtr, 2, "mutationsptr.ptr");
1484 llvm::Value *StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr,
1487 llvm::Value *initialMutations =
1488 Builder.CreateLoad(StateMutationsPtr, "forcoll.initial-mutations");
1490 // Start looping. This is the point we return to whenever we have a
1491 // fresh, non-empty batch of objects.
1492 llvm::BasicBlock *LoopBodyBB = createBasicBlock("forcoll.loopbody");
1493 EmitBlock(LoopBodyBB);
1495 // The current index into the buffer.
1496 llvm::PHINode *index = Builder.CreatePHI(UnsignedLongLTy, 3, "forcoll.index");
1497 index->addIncoming(zero, LoopInitBB);
1499 // The current buffer size.
1500 llvm::PHINode *count = Builder.CreatePHI(UnsignedLongLTy, 3, "forcoll.count");
1501 count->addIncoming(initialBufferLimit, LoopInitBB);
1503 // Check whether the mutations value has changed from where it was
1504 // at start. StateMutationsPtr should actually be invariant between
1506 StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr");
1507 llvm::Value *currentMutations
1508 = Builder.CreateLoad(StateMutationsPtr, "statemutations");
1510 llvm::BasicBlock *WasMutatedBB = createBasicBlock("forcoll.mutated");
1511 llvm::BasicBlock *WasNotMutatedBB = createBasicBlock("forcoll.notmutated");
1513 Builder.CreateCondBr(Builder.CreateICmpEQ(currentMutations, initialMutations),
1514 WasNotMutatedBB, WasMutatedBB);
1516 // If so, call the enumeration-mutation function.
1517 EmitBlock(WasMutatedBB);
1519 Builder.CreateBitCast(Collection,
1520 ConvertType(getContext().getObjCIdType()));
1522 Args2.add(RValue::get(V), getContext().getObjCIdType());
1523 // FIXME: We shouldn't need to get the function info here, the runtime already
1524 // should have computed it to build the function.
1525 EmitCall(CGM.getTypes().arrangeFreeFunctionCall(getContext().VoidTy, Args2,
1526 FunctionType::ExtInfo(),
1528 EnumerationMutationFn, ReturnValueSlot(), Args2);
1530 // Otherwise, or if the mutation function returns, just continue.
1531 EmitBlock(WasNotMutatedBB);
1533 // Initialize the element variable.
1534 RunCleanupsScope elementVariableScope(*this);
1535 bool elementIsVariable;
1536 LValue elementLValue;
1537 QualType elementType;
1538 if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) {
1539 // Initialize the variable, in case it's a __block variable or something.
1540 EmitAutoVarInit(variable);
1542 const VarDecl* D = cast<VarDecl>(SD->getSingleDecl());
1543 DeclRefExpr tempDRE(const_cast<VarDecl*>(D), false, D->getType(),
1544 VK_LValue, SourceLocation());
1545 elementLValue = EmitLValue(&tempDRE);
1546 elementType = D->getType();
1547 elementIsVariable = true;
1549 if (D->isARCPseudoStrong())
1550 elementLValue.getQuals().setObjCLifetime(Qualifiers::OCL_ExplicitNone);
1552 elementLValue = LValue(); // suppress warning
1553 elementType = cast<Expr>(S.getElement())->getType();
1554 elementIsVariable = false;
1556 llvm::Type *convertedElementType = ConvertType(elementType);
1558 // Fetch the buffer out of the enumeration state.
1559 // TODO: this pointer should actually be invariant between
1560 // refreshes, which would help us do certain loop optimizations.
1561 llvm::Value *StateItemsPtr =
1562 Builder.CreateStructGEP(StatePtr, 1, "stateitems.ptr");
1563 llvm::Value *EnumStateItems =
1564 Builder.CreateLoad(StateItemsPtr, "stateitems");
1566 // Fetch the value at the current index from the buffer.
1567 llvm::Value *CurrentItemPtr =
1568 Builder.CreateGEP(EnumStateItems, index, "currentitem.ptr");
1569 llvm::Value *CurrentItem = Builder.CreateLoad(CurrentItemPtr);
1571 // Cast that value to the right type.
1572 CurrentItem = Builder.CreateBitCast(CurrentItem, convertedElementType,
1575 // Make sure we have an l-value. Yes, this gets evaluated every
1576 // time through the loop.
1577 if (!elementIsVariable) {
1578 elementLValue = EmitLValue(cast<Expr>(S.getElement()));
1579 EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue);
1581 EmitScalarInit(CurrentItem, elementLValue);
1584 // If we do have an element variable, this assignment is the end of
1585 // its initialization.
1586 if (elementIsVariable)
1587 EmitAutoVarCleanups(variable);
1589 // Perform the loop body, setting up break and continue labels.
1590 BreakContinueStack.push_back(BreakContinue(LoopEnd, AfterBody));
1592 RunCleanupsScope Scope(*this);
1593 EmitStmt(S.getBody());
1595 BreakContinueStack.pop_back();
1597 // Destroy the element variable now.
1598 elementVariableScope.ForceCleanup();
1600 // Check whether there are more elements.
1601 EmitBlock(AfterBody.getBlock());
1603 llvm::BasicBlock *FetchMoreBB = createBasicBlock("forcoll.refetch");
1605 // First we check in the local buffer.
1606 llvm::Value *indexPlusOne
1607 = Builder.CreateAdd(index, llvm::ConstantInt::get(UnsignedLongLTy, 1));
1609 // If we haven't overrun the buffer yet, we can continue.
1610 Builder.CreateCondBr(Builder.CreateICmpULT(indexPlusOne, count),
1611 LoopBodyBB, FetchMoreBB);
1613 index->addIncoming(indexPlusOne, AfterBody.getBlock());
1614 count->addIncoming(count, AfterBody.getBlock());
1616 // Otherwise, we have to fetch more elements.
1617 EmitBlock(FetchMoreBB);
1620 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
1621 getContext().UnsignedLongTy,
1625 // If we got a zero count, we're done.
1626 llvm::Value *refetchCount = CountRV.getScalarVal();
1628 // (note that the message send might split FetchMoreBB)
1629 index->addIncoming(zero, Builder.GetInsertBlock());
1630 count->addIncoming(refetchCount, Builder.GetInsertBlock());
1632 Builder.CreateCondBr(Builder.CreateICmpEQ(refetchCount, zero),
1633 EmptyBB, LoopBodyBB);
1635 // No more elements.
1638 if (!elementIsVariable) {
1639 // If the element was not a declaration, set it to be null.
1641 llvm::Value *null = llvm::Constant::getNullValue(convertedElementType);
1642 elementLValue = EmitLValue(cast<Expr>(S.getElement()));
1643 EmitStoreThroughLValue(RValue::get(null), elementLValue);
1647 DI->EmitLexicalBlockEnd(Builder, S.getSourceRange().getEnd());
1649 // Leave the cleanup we entered in ARC.
1650 if (getLangOpts().ObjCAutoRefCount)
1653 EmitBlock(LoopEnd.getBlock());
1656 void CodeGenFunction::EmitObjCAtTryStmt(const ObjCAtTryStmt &S) {
1657 CGM.getObjCRuntime().EmitTryStmt(*this, S);
1660 void CodeGenFunction::EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S) {
1661 CGM.getObjCRuntime().EmitThrowStmt(*this, S);
1664 void CodeGenFunction::EmitObjCAtSynchronizedStmt(
1665 const ObjCAtSynchronizedStmt &S) {
1666 CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S);
1669 /// Produce the code for a CK_ARCProduceObject. Just does a
1670 /// primitive retain.
1671 llvm::Value *CodeGenFunction::EmitObjCProduceObject(QualType type,
1672 llvm::Value *value) {
1673 return EmitARCRetain(type, value);
1677 struct CallObjCRelease : EHScopeStack::Cleanup {
1678 CallObjCRelease(llvm::Value *object) : object(object) {}
1679 llvm::Value *object;
1681 void Emit(CodeGenFunction &CGF, Flags flags) {
1682 CGF.EmitARCRelease(object, /*precise*/ true);
1687 /// Produce the code for a CK_ARCConsumeObject. Does a primitive
1688 /// release at the end of the full-expression.
1689 llvm::Value *CodeGenFunction::EmitObjCConsumeObject(QualType type,
1690 llvm::Value *object) {
1691 // If we're in a conditional branch, we need to make the cleanup
1693 pushFullExprCleanup<CallObjCRelease>(getARCCleanupKind(), object);
1697 llvm::Value *CodeGenFunction::EmitObjCExtendObjectLifetime(QualType type,
1698 llvm::Value *value) {
1699 return EmitARCRetainAutorelease(type, value);
1703 static llvm::Constant *createARCRuntimeFunction(CodeGenModule &CGM,
1704 llvm::FunctionType *type,
1706 llvm::Constant *fn = CGM.CreateRuntimeFunction(type, fnName);
1708 // If the target runtime doesn't naturally support ARC, emit weak
1709 // references to the runtime support library. We don't really
1710 // permit this to fail, but we need a particular relocation style.
1711 if (llvm::Function *f = dyn_cast<llvm::Function>(fn)) {
1712 if (!CGM.getLangOpts().ObjCRuntime.hasNativeARC())
1713 f->setLinkage(llvm::Function::ExternalWeakLinkage);
1714 // set nonlazybind attribute for these APIs for performance.
1715 if (fnName == "objc_retain" || fnName == "objc_release")
1716 f->addFnAttr(llvm::Attributes::NonLazyBind);
1722 /// Perform an operation having the signature
1724 /// where a null input causes a no-op and returns null.
1725 static llvm::Value *emitARCValueOperation(CodeGenFunction &CGF,
1727 llvm::Constant *&fn,
1729 if (isa<llvm::ConstantPointerNull>(value)) return value;
1732 std::vector<llvm::Type*> args(1, CGF.Int8PtrTy);
1733 llvm::FunctionType *fnType =
1734 llvm::FunctionType::get(CGF.Int8PtrTy, args, false);
1735 fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1738 // Cast the argument to 'id'.
1739 llvm::Type *origType = value->getType();
1740 value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
1742 // Call the function.
1743 llvm::CallInst *call = CGF.Builder.CreateCall(fn, value);
1744 call->setDoesNotThrow();
1746 // Cast the result back to the original type.
1747 return CGF.Builder.CreateBitCast(call, origType);
1750 /// Perform an operation having the following signature:
1752 static llvm::Value *emitARCLoadOperation(CodeGenFunction &CGF,
1754 llvm::Constant *&fn,
1757 std::vector<llvm::Type*> args(1, CGF.Int8PtrPtrTy);
1758 llvm::FunctionType *fnType =
1759 llvm::FunctionType::get(CGF.Int8PtrTy, args, false);
1760 fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1763 // Cast the argument to 'id*'.
1764 llvm::Type *origType = addr->getType();
1765 addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
1767 // Call the function.
1768 llvm::CallInst *call = CGF.Builder.CreateCall(fn, addr);
1769 call->setDoesNotThrow();
1771 // Cast the result back to a dereference of the original type.
1772 llvm::Value *result = call;
1773 if (origType != CGF.Int8PtrPtrTy)
1774 result = CGF.Builder.CreateBitCast(result,
1775 cast<llvm::PointerType>(origType)->getElementType());
1780 /// Perform an operation having the following signature:
1782 static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF,
1785 llvm::Constant *&fn,
1788 assert(cast<llvm::PointerType>(addr->getType())->getElementType()
1789 == value->getType());
1792 llvm::Type *argTypes[] = { CGF.Int8PtrPtrTy, CGF.Int8PtrTy };
1794 llvm::FunctionType *fnType
1795 = llvm::FunctionType::get(CGF.Int8PtrTy, argTypes, false);
1796 fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1799 llvm::Type *origType = value->getType();
1801 addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
1802 value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
1804 llvm::CallInst *result = CGF.Builder.CreateCall2(fn, addr, value);
1805 result->setDoesNotThrow();
1807 if (ignored) return 0;
1809 return CGF.Builder.CreateBitCast(result, origType);
1812 /// Perform an operation having the following signature:
1813 /// void (i8**, i8**)
1814 static void emitARCCopyOperation(CodeGenFunction &CGF,
1817 llvm::Constant *&fn,
1819 assert(dst->getType() == src->getType());
1822 std::vector<llvm::Type*> argTypes(2, CGF.Int8PtrPtrTy);
1823 llvm::FunctionType *fnType
1824 = llvm::FunctionType::get(CGF.Builder.getVoidTy(), argTypes, false);
1825 fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1828 dst = CGF.Builder.CreateBitCast(dst, CGF.Int8PtrPtrTy);
1829 src = CGF.Builder.CreateBitCast(src, CGF.Int8PtrPtrTy);
1831 llvm::CallInst *result = CGF.Builder.CreateCall2(fn, dst, src);
1832 result->setDoesNotThrow();
1835 /// Produce the code to do a retain. Based on the type, calls one of:
1836 /// call i8* \@objc_retain(i8* %value)
1837 /// call i8* \@objc_retainBlock(i8* %value)
1838 llvm::Value *CodeGenFunction::EmitARCRetain(QualType type, llvm::Value *value) {
1839 if (type->isBlockPointerType())
1840 return EmitARCRetainBlock(value, /*mandatory*/ false);
1842 return EmitARCRetainNonBlock(value);
1845 /// Retain the given object, with normal retain semantics.
1846 /// call i8* \@objc_retain(i8* %value)
1847 llvm::Value *CodeGenFunction::EmitARCRetainNonBlock(llvm::Value *value) {
1848 return emitARCValueOperation(*this, value,
1849 CGM.getARCEntrypoints().objc_retain,
1853 /// Retain the given block, with _Block_copy semantics.
1854 /// call i8* \@objc_retainBlock(i8* %value)
1856 /// \param mandatory - If false, emit the call with metadata
1857 /// indicating that it's okay for the optimizer to eliminate this call
1858 /// if it can prove that the block never escapes except down the stack.
1859 llvm::Value *CodeGenFunction::EmitARCRetainBlock(llvm::Value *value,
1862 = emitARCValueOperation(*this, value,
1863 CGM.getARCEntrypoints().objc_retainBlock,
1864 "objc_retainBlock");
1866 // If the copy isn't mandatory, add !clang.arc.copy_on_escape to
1867 // tell the optimizer that it doesn't need to do this copy if the
1868 // block doesn't escape, where being passed as an argument doesn't
1869 // count as escaping.
1870 if (!mandatory && isa<llvm::Instruction>(result)) {
1871 llvm::CallInst *call
1872 = cast<llvm::CallInst>(result->stripPointerCasts());
1873 assert(call->getCalledValue() == CGM.getARCEntrypoints().objc_retainBlock);
1875 SmallVector<llvm::Value*,1> args;
1876 call->setMetadata("clang.arc.copy_on_escape",
1877 llvm::MDNode::get(Builder.getContext(), args));
1883 /// Retain the given object which is the result of a function call.
1884 /// call i8* \@objc_retainAutoreleasedReturnValue(i8* %value)
1886 /// Yes, this function name is one character away from a different
1887 /// call with completely different semantics.
1889 CodeGenFunction::EmitARCRetainAutoreleasedReturnValue(llvm::Value *value) {
1890 // Fetch the void(void) inline asm which marks that we're going to
1891 // retain the autoreleased return value.
1892 llvm::InlineAsm *&marker
1893 = CGM.getARCEntrypoints().retainAutoreleasedReturnValueMarker;
1896 = CGM.getTargetCodeGenInfo()
1897 .getARCRetainAutoreleasedReturnValueMarker();
1899 // If we have an empty assembly string, there's nothing to do.
1900 if (assembly.empty()) {
1902 // Otherwise, at -O0, build an inline asm that we're going to call
1904 } else if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
1905 llvm::FunctionType *type =
1906 llvm::FunctionType::get(VoidTy, /*variadic*/false);
1908 marker = llvm::InlineAsm::get(type, assembly, "", /*sideeffects*/ true);
1910 // If we're at -O1 and above, we don't want to litter the code
1911 // with this marker yet, so leave a breadcrumb for the ARC
1912 // optimizer to pick up.
1914 llvm::NamedMDNode *metadata =
1915 CGM.getModule().getOrInsertNamedMetadata(
1916 "clang.arc.retainAutoreleasedReturnValueMarker");
1917 assert(metadata->getNumOperands() <= 1);
1918 if (metadata->getNumOperands() == 0) {
1919 llvm::Value *string = llvm::MDString::get(getLLVMContext(), assembly);
1920 metadata->addOperand(llvm::MDNode::get(getLLVMContext(), string));
1925 // Call the marker asm if we made one, which we do only at -O0.
1926 if (marker) Builder.CreateCall(marker);
1928 return emitARCValueOperation(*this, value,
1929 CGM.getARCEntrypoints().objc_retainAutoreleasedReturnValue,
1930 "objc_retainAutoreleasedReturnValue");
1933 /// Release the given object.
1934 /// call void \@objc_release(i8* %value)
1935 void CodeGenFunction::EmitARCRelease(llvm::Value *value, bool precise) {
1936 if (isa<llvm::ConstantPointerNull>(value)) return;
1938 llvm::Constant *&fn = CGM.getARCEntrypoints().objc_release;
1940 std::vector<llvm::Type*> args(1, Int8PtrTy);
1941 llvm::FunctionType *fnType =
1942 llvm::FunctionType::get(Builder.getVoidTy(), args, false);
1943 fn = createARCRuntimeFunction(CGM, fnType, "objc_release");
1946 // Cast the argument to 'id'.
1947 value = Builder.CreateBitCast(value, Int8PtrTy);
1949 // Call objc_release.
1950 llvm::CallInst *call = Builder.CreateCall(fn, value);
1951 call->setDoesNotThrow();
1954 SmallVector<llvm::Value*,1> args;
1955 call->setMetadata("clang.imprecise_release",
1956 llvm::MDNode::get(Builder.getContext(), args));
1960 /// Destroy a __strong variable.
1962 /// At -O0, emit a call to store 'null' into the address;
1963 /// instrumenting tools prefer this because the address is exposed,
1964 /// but it's relatively cumbersome to optimize.
1966 /// At -O1 and above, just load and call objc_release.
1968 /// call void \@objc_storeStrong(i8** %addr, i8* null)
1969 void CodeGenFunction::EmitARCDestroyStrong(llvm::Value *addr, bool precise) {
1970 if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
1971 llvm::PointerType *addrTy = cast<llvm::PointerType>(addr->getType());
1972 llvm::Value *null = llvm::ConstantPointerNull::get(
1973 cast<llvm::PointerType>(addrTy->getElementType()));
1974 EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
1978 llvm::Value *value = Builder.CreateLoad(addr);
1979 EmitARCRelease(value, precise);
1982 /// Store into a strong object. Always calls this:
1983 /// call void \@objc_storeStrong(i8** %addr, i8* %value)
1984 llvm::Value *CodeGenFunction::EmitARCStoreStrongCall(llvm::Value *addr,
1987 assert(cast<llvm::PointerType>(addr->getType())->getElementType()
1988 == value->getType());
1990 llvm::Constant *&fn = CGM.getARCEntrypoints().objc_storeStrong;
1992 llvm::Type *argTypes[] = { Int8PtrPtrTy, Int8PtrTy };
1993 llvm::FunctionType *fnType
1994 = llvm::FunctionType::get(Builder.getVoidTy(), argTypes, false);
1995 fn = createARCRuntimeFunction(CGM, fnType, "objc_storeStrong");
1998 addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
1999 llvm::Value *castValue = Builder.CreateBitCast(value, Int8PtrTy);
2001 Builder.CreateCall2(fn, addr, castValue)->setDoesNotThrow();
2003 if (ignored) return 0;
2007 /// Store into a strong object. Sometimes calls this:
2008 /// call void \@objc_storeStrong(i8** %addr, i8* %value)
2009 /// Other times, breaks it down into components.
2010 llvm::Value *CodeGenFunction::EmitARCStoreStrong(LValue dst,
2011 llvm::Value *newValue,
2013 QualType type = dst.getType();
2014 bool isBlock = type->isBlockPointerType();
2016 // Use a store barrier at -O0 unless this is a block type or the
2017 // lvalue is inadequately aligned.
2018 if (shouldUseFusedARCCalls() &&
2020 (dst.getAlignment().isZero() ||
2021 dst.getAlignment() >= CharUnits::fromQuantity(PointerAlignInBytes))) {
2022 return EmitARCStoreStrongCall(dst.getAddress(), newValue, ignored);
2025 // Otherwise, split it out.
2027 // Retain the new value.
2028 newValue = EmitARCRetain(type, newValue);
2030 // Read the old value.
2031 llvm::Value *oldValue = EmitLoadOfScalar(dst);
2033 // Store. We do this before the release so that any deallocs won't
2034 // see the old value.
2035 EmitStoreOfScalar(newValue, dst);
2037 // Finally, release the old value.
2038 EmitARCRelease(oldValue, /*precise*/ false);
2043 /// Autorelease the given object.
2044 /// call i8* \@objc_autorelease(i8* %value)
2045 llvm::Value *CodeGenFunction::EmitARCAutorelease(llvm::Value *value) {
2046 return emitARCValueOperation(*this, value,
2047 CGM.getARCEntrypoints().objc_autorelease,
2048 "objc_autorelease");
2051 /// Autorelease the given object.
2052 /// call i8* \@objc_autoreleaseReturnValue(i8* %value)
2054 CodeGenFunction::EmitARCAutoreleaseReturnValue(llvm::Value *value) {
2055 return emitARCValueOperation(*this, value,
2056 CGM.getARCEntrypoints().objc_autoreleaseReturnValue,
2057 "objc_autoreleaseReturnValue");
2060 /// Do a fused retain/autorelease of the given object.
2061 /// call i8* \@objc_retainAutoreleaseReturnValue(i8* %value)
2063 CodeGenFunction::EmitARCRetainAutoreleaseReturnValue(llvm::Value *value) {
2064 return emitARCValueOperation(*this, value,
2065 CGM.getARCEntrypoints().objc_retainAutoreleaseReturnValue,
2066 "objc_retainAutoreleaseReturnValue");
2069 /// Do a fused retain/autorelease of the given object.
2070 /// call i8* \@objc_retainAutorelease(i8* %value)
2072 /// %retain = call i8* \@objc_retainBlock(i8* %value)
2073 /// call i8* \@objc_autorelease(i8* %retain)
2074 llvm::Value *CodeGenFunction::EmitARCRetainAutorelease(QualType type,
2075 llvm::Value *value) {
2076 if (!type->isBlockPointerType())
2077 return EmitARCRetainAutoreleaseNonBlock(value);
2079 if (isa<llvm::ConstantPointerNull>(value)) return value;
2081 llvm::Type *origType = value->getType();
2082 value = Builder.CreateBitCast(value, Int8PtrTy);
2083 value = EmitARCRetainBlock(value, /*mandatory*/ true);
2084 value = EmitARCAutorelease(value);
2085 return Builder.CreateBitCast(value, origType);
2088 /// Do a fused retain/autorelease of the given object.
2089 /// call i8* \@objc_retainAutorelease(i8* %value)
2091 CodeGenFunction::EmitARCRetainAutoreleaseNonBlock(llvm::Value *value) {
2092 return emitARCValueOperation(*this, value,
2093 CGM.getARCEntrypoints().objc_retainAutorelease,
2094 "objc_retainAutorelease");
2097 /// i8* \@objc_loadWeak(i8** %addr)
2098 /// Essentially objc_autorelease(objc_loadWeakRetained(addr)).
2099 llvm::Value *CodeGenFunction::EmitARCLoadWeak(llvm::Value *addr) {
2100 return emitARCLoadOperation(*this, addr,
2101 CGM.getARCEntrypoints().objc_loadWeak,
2105 /// i8* \@objc_loadWeakRetained(i8** %addr)
2106 llvm::Value *CodeGenFunction::EmitARCLoadWeakRetained(llvm::Value *addr) {
2107 return emitARCLoadOperation(*this, addr,
2108 CGM.getARCEntrypoints().objc_loadWeakRetained,
2109 "objc_loadWeakRetained");
2112 /// i8* \@objc_storeWeak(i8** %addr, i8* %value)
2114 llvm::Value *CodeGenFunction::EmitARCStoreWeak(llvm::Value *addr,
2117 return emitARCStoreOperation(*this, addr, value,
2118 CGM.getARCEntrypoints().objc_storeWeak,
2119 "objc_storeWeak", ignored);
2122 /// i8* \@objc_initWeak(i8** %addr, i8* %value)
2123 /// Returns %value. %addr is known to not have a current weak entry.
2124 /// Essentially equivalent to:
2125 /// *addr = nil; objc_storeWeak(addr, value);
2126 void CodeGenFunction::EmitARCInitWeak(llvm::Value *addr, llvm::Value *value) {
2127 // If we're initializing to null, just write null to memory; no need
2128 // to get the runtime involved. But don't do this if optimization
2129 // is enabled, because accounting for this would make the optimizer
2130 // much more complicated.
2131 if (isa<llvm::ConstantPointerNull>(value) &&
2132 CGM.getCodeGenOpts().OptimizationLevel == 0) {
2133 Builder.CreateStore(value, addr);
2137 emitARCStoreOperation(*this, addr, value,
2138 CGM.getARCEntrypoints().objc_initWeak,
2139 "objc_initWeak", /*ignored*/ true);
2142 /// void \@objc_destroyWeak(i8** %addr)
2143 /// Essentially objc_storeWeak(addr, nil).
2144 void CodeGenFunction::EmitARCDestroyWeak(llvm::Value *addr) {
2145 llvm::Constant *&fn = CGM.getARCEntrypoints().objc_destroyWeak;
2147 std::vector<llvm::Type*> args(1, Int8PtrPtrTy);
2148 llvm::FunctionType *fnType =
2149 llvm::FunctionType::get(Builder.getVoidTy(), args, false);
2150 fn = createARCRuntimeFunction(CGM, fnType, "objc_destroyWeak");
2153 // Cast the argument to 'id*'.
2154 addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
2156 llvm::CallInst *call = Builder.CreateCall(fn, addr);
2157 call->setDoesNotThrow();
2160 /// void \@objc_moveWeak(i8** %dest, i8** %src)
2161 /// Disregards the current value in %dest. Leaves %src pointing to nothing.
2162 /// Essentially (objc_copyWeak(dest, src), objc_destroyWeak(src)).
2163 void CodeGenFunction::EmitARCMoveWeak(llvm::Value *dst, llvm::Value *src) {
2164 emitARCCopyOperation(*this, dst, src,
2165 CGM.getARCEntrypoints().objc_moveWeak,
2169 /// void \@objc_copyWeak(i8** %dest, i8** %src)
2170 /// Disregards the current value in %dest. Essentially
2171 /// objc_release(objc_initWeak(dest, objc_readWeakRetained(src)))
2172 void CodeGenFunction::EmitARCCopyWeak(llvm::Value *dst, llvm::Value *src) {
2173 emitARCCopyOperation(*this, dst, src,
2174 CGM.getARCEntrypoints().objc_copyWeak,
2178 /// Produce the code to do a objc_autoreleasepool_push.
2179 /// call i8* \@objc_autoreleasePoolPush(void)
2180 llvm::Value *CodeGenFunction::EmitObjCAutoreleasePoolPush() {
2181 llvm::Constant *&fn = CGM.getRREntrypoints().objc_autoreleasePoolPush;
2183 llvm::FunctionType *fnType =
2184 llvm::FunctionType::get(Int8PtrTy, false);
2185 fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPush");
2188 llvm::CallInst *call = Builder.CreateCall(fn);
2189 call->setDoesNotThrow();
2194 /// Produce the code to do a primitive release.
2195 /// call void \@objc_autoreleasePoolPop(i8* %ptr)
2196 void CodeGenFunction::EmitObjCAutoreleasePoolPop(llvm::Value *value) {
2197 assert(value->getType() == Int8PtrTy);
2199 llvm::Constant *&fn = CGM.getRREntrypoints().objc_autoreleasePoolPop;
2201 std::vector<llvm::Type*> args(1, Int8PtrTy);
2202 llvm::FunctionType *fnType =
2203 llvm::FunctionType::get(Builder.getVoidTy(), args, false);
2205 // We don't want to use a weak import here; instead we should not
2206 // fall into this path.
2207 fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPop");
2210 llvm::CallInst *call = Builder.CreateCall(fn, value);
2211 call->setDoesNotThrow();
2214 /// Produce the code to do an MRR version objc_autoreleasepool_push.
2215 /// Which is: [[NSAutoreleasePool alloc] init];
2216 /// Where alloc is declared as: + (id) alloc; in NSAutoreleasePool class.
2217 /// init is declared as: - (id) init; in its NSObject super class.
2219 llvm::Value *CodeGenFunction::EmitObjCMRRAutoreleasePoolPush() {
2220 CGObjCRuntime &Runtime = CGM.getObjCRuntime();
2221 llvm::Value *Receiver = Runtime.EmitNSAutoreleasePoolClassRef(Builder);
2222 // [NSAutoreleasePool alloc]
2223 IdentifierInfo *II = &CGM.getContext().Idents.get("alloc");
2224 Selector AllocSel = getContext().Selectors.getSelector(0, &II);
2227 Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
2228 getContext().getObjCIdType(),
2229 AllocSel, Receiver, Args);
2232 Receiver = AllocRV.getScalarVal();
2233 II = &CGM.getContext().Idents.get("init");
2234 Selector InitSel = getContext().Selectors.getSelector(0, &II);
2236 Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
2237 getContext().getObjCIdType(),
2238 InitSel, Receiver, Args);
2239 return InitRV.getScalarVal();
2242 /// Produce the code to do a primitive release.
2244 void CodeGenFunction::EmitObjCMRRAutoreleasePoolPop(llvm::Value *Arg) {
2245 IdentifierInfo *II = &CGM.getContext().Idents.get("drain");
2246 Selector DrainSel = getContext().Selectors.getSelector(0, &II);
2248 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
2249 getContext().VoidTy, DrainSel, Arg, Args);
2252 void CodeGenFunction::destroyARCStrongPrecise(CodeGenFunction &CGF,
2255 CGF.EmitARCDestroyStrong(addr, /*precise*/ true);
2258 void CodeGenFunction::destroyARCStrongImprecise(CodeGenFunction &CGF,
2261 CGF.EmitARCDestroyStrong(addr, /*precise*/ false);
2264 void CodeGenFunction::destroyARCWeak(CodeGenFunction &CGF,
2267 CGF.EmitARCDestroyWeak(addr);
2271 struct CallObjCAutoreleasePoolObject : EHScopeStack::Cleanup {
2274 CallObjCAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
2276 void Emit(CodeGenFunction &CGF, Flags flags) {
2277 CGF.EmitObjCAutoreleasePoolPop(Token);
2280 struct CallObjCMRRAutoreleasePoolObject : EHScopeStack::Cleanup {
2283 CallObjCMRRAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
2285 void Emit(CodeGenFunction &CGF, Flags flags) {
2286 CGF.EmitObjCMRRAutoreleasePoolPop(Token);
2291 void CodeGenFunction::EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr) {
2292 if (CGM.getLangOpts().ObjCAutoRefCount)
2293 EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, Ptr);
2295 EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, Ptr);
2298 static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
2301 switch (type.getObjCLifetime()) {
2302 case Qualifiers::OCL_None:
2303 case Qualifiers::OCL_ExplicitNone:
2304 case Qualifiers::OCL_Strong:
2305 case Qualifiers::OCL_Autoreleasing:
2306 return TryEmitResult(CGF.EmitLoadOfLValue(lvalue).getScalarVal(),
2309 case Qualifiers::OCL_Weak:
2310 return TryEmitResult(CGF.EmitARCLoadWeakRetained(lvalue.getAddress()),
2314 llvm_unreachable("impossible lifetime!");
2317 static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
2319 e = e->IgnoreParens();
2320 QualType type = e->getType();
2322 // If we're loading retained from a __strong xvalue, we can avoid
2323 // an extra retain/release pair by zeroing out the source of this
2324 // "move" operation.
2325 if (e->isXValue() &&
2326 !type.isConstQualified() &&
2327 type.getObjCLifetime() == Qualifiers::OCL_Strong) {
2329 LValue lv = CGF.EmitLValue(e);
2331 // Load the object pointer.
2332 llvm::Value *result = CGF.EmitLoadOfLValue(lv).getScalarVal();
2334 // Set the source pointer to NULL.
2335 CGF.EmitStoreOfScalar(getNullForVariable(lv.getAddress()), lv);
2337 return TryEmitResult(result, true);
2340 // As a very special optimization, in ARC++, if the l-value is the
2341 // result of a non-volatile assignment, do a simple retain of the
2342 // result of the call to objc_storeWeak instead of reloading.
2343 if (CGF.getLangOpts().CPlusPlus &&
2344 !type.isVolatileQualified() &&
2345 type.getObjCLifetime() == Qualifiers::OCL_Weak &&
2346 isa<BinaryOperator>(e) &&
2347 cast<BinaryOperator>(e)->getOpcode() == BO_Assign)
2348 return TryEmitResult(CGF.EmitScalarExpr(e), false);
2350 return tryEmitARCRetainLoadOfScalar(CGF, CGF.EmitLValue(e), type);
2353 static llvm::Value *emitARCRetainAfterCall(CodeGenFunction &CGF,
2354 llvm::Value *value);
2356 /// Given that the given expression is some sort of call (which does
2357 /// not return retained), emit a retain following it.
2358 static llvm::Value *emitARCRetainCall(CodeGenFunction &CGF, const Expr *e) {
2359 llvm::Value *value = CGF.EmitScalarExpr(e);
2360 return emitARCRetainAfterCall(CGF, value);
2363 static llvm::Value *emitARCRetainAfterCall(CodeGenFunction &CGF,
2364 llvm::Value *value) {
2365 if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(value)) {
2366 CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
2368 // Place the retain immediately following the call.
2369 CGF.Builder.SetInsertPoint(call->getParent(),
2370 ++llvm::BasicBlock::iterator(call));
2371 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
2373 CGF.Builder.restoreIP(ip);
2375 } else if (llvm::InvokeInst *invoke = dyn_cast<llvm::InvokeInst>(value)) {
2376 CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
2378 // Place the retain at the beginning of the normal destination block.
2379 llvm::BasicBlock *BB = invoke->getNormalDest();
2380 CGF.Builder.SetInsertPoint(BB, BB->begin());
2381 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
2383 CGF.Builder.restoreIP(ip);
2386 // Bitcasts can arise because of related-result returns. Rewrite
2388 } else if (llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(value)) {
2389 llvm::Value *operand = bitcast->getOperand(0);
2390 operand = emitARCRetainAfterCall(CGF, operand);
2391 bitcast->setOperand(0, operand);
2394 // Generic fall-back case.
2396 // Retain using the non-block variant: we never need to do a copy
2397 // of a block that's been returned to us.
2398 return CGF.EmitARCRetainNonBlock(value);
2402 /// Determine whether it might be important to emit a separate
2403 /// objc_retain_block on the result of the given expression, or
2404 /// whether it's okay to just emit it in a +1 context.
2405 static bool shouldEmitSeparateBlockRetain(const Expr *e) {
2406 assert(e->getType()->isBlockPointerType());
2407 e = e->IgnoreParens();
2409 // For future goodness, emit block expressions directly in +1
2410 // contexts if we can.
2411 if (isa<BlockExpr>(e))
2414 if (const CastExpr *cast = dyn_cast<CastExpr>(e)) {
2415 switch (cast->getCastKind()) {
2416 // Emitting these operations in +1 contexts is goodness.
2417 case CK_LValueToRValue:
2418 case CK_ARCReclaimReturnedObject:
2419 case CK_ARCConsumeObject:
2420 case CK_ARCProduceObject:
2423 // These operations preserve a block type.
2426 return shouldEmitSeparateBlockRetain(cast->getSubExpr());
2428 // These operations are known to be bad (or haven't been considered).
2429 case CK_AnyPointerToBlockPointerCast:
2438 /// Try to emit a PseudoObjectExpr at +1.
2440 /// This massively duplicates emitPseudoObjectRValue.
2441 static TryEmitResult tryEmitARCRetainPseudoObject(CodeGenFunction &CGF,
2442 const PseudoObjectExpr *E) {
2443 llvm::SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
2445 // Find the result expression.
2446 const Expr *resultExpr = E->getResultExpr();
2448 TryEmitResult result;
2450 for (PseudoObjectExpr::const_semantics_iterator
2451 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2452 const Expr *semantic = *i;
2454 // If this semantic expression is an opaque value, bind it
2455 // to the result of its source expression.
2456 if (const OpaqueValueExpr *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
2457 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
2460 // If this semantic is the result of the pseudo-object
2461 // expression, try to evaluate the source as +1.
2462 if (ov == resultExpr) {
2463 assert(!OVMA::shouldBindAsLValue(ov));
2464 result = tryEmitARCRetainScalarExpr(CGF, ov->getSourceExpr());
2465 opaqueData = OVMA::bind(CGF, ov, RValue::get(result.getPointer()));
2467 // Otherwise, just bind it.
2469 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
2471 opaques.push_back(opaqueData);
2473 // Otherwise, if the expression is the result, evaluate it
2474 // and remember the result.
2475 } else if (semantic == resultExpr) {
2476 result = tryEmitARCRetainScalarExpr(CGF, semantic);
2478 // Otherwise, evaluate the expression in an ignored context.
2480 CGF.EmitIgnoredExpr(semantic);
2484 // Unbind all the opaques now.
2485 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
2486 opaques[i].unbind(CGF);
2491 static TryEmitResult
2492 tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) {
2493 // Look through cleanups.
2494 if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
2495 CGF.enterFullExpression(cleanups);
2496 CodeGenFunction::RunCleanupsScope scope(CGF);
2497 return tryEmitARCRetainScalarExpr(CGF, cleanups->getSubExpr());
2500 // The desired result type, if it differs from the type of the
2501 // ultimate opaque expression.
2502 llvm::Type *resultType = 0;
2505 e = e->IgnoreParens();
2507 // There's a break at the end of this if-chain; anything
2508 // that wants to keep looping has to explicitly continue.
2509 if (const CastExpr *ce = dyn_cast<CastExpr>(e)) {
2510 switch (ce->getCastKind()) {
2511 // No-op casts don't change the type, so we just ignore them.
2513 e = ce->getSubExpr();
2516 case CK_LValueToRValue: {
2517 TryEmitResult loadResult
2518 = tryEmitARCRetainLoadOfScalar(CGF, ce->getSubExpr());
2520 llvm::Value *value = loadResult.getPointer();
2521 value = CGF.Builder.CreateBitCast(value, resultType);
2522 loadResult.setPointer(value);
2527 // These casts can change the type, so remember that and
2528 // soldier on. We only need to remember the outermost such
2530 case CK_CPointerToObjCPointerCast:
2531 case CK_BlockPointerToObjCPointerCast:
2532 case CK_AnyPointerToBlockPointerCast:
2535 resultType = CGF.ConvertType(ce->getType());
2536 e = ce->getSubExpr();
2537 assert(e->getType()->hasPointerRepresentation());
2540 // For consumptions, just emit the subexpression and thus elide
2541 // the retain/release pair.
2542 case CK_ARCConsumeObject: {
2543 llvm::Value *result = CGF.EmitScalarExpr(ce->getSubExpr());
2544 if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
2545 return TryEmitResult(result, true);
2548 // Block extends are net +0. Naively, we could just recurse on
2549 // the subexpression, but actually we need to ensure that the
2550 // value is copied as a block, so there's a little filter here.
2551 case CK_ARCExtendBlockObject: {
2552 llvm::Value *result; // will be a +0 value
2554 // If we can't safely assume the sub-expression will produce a
2555 // block-copied value, emit the sub-expression at +0.
2556 if (shouldEmitSeparateBlockRetain(ce->getSubExpr())) {
2557 result = CGF.EmitScalarExpr(ce->getSubExpr());
2559 // Otherwise, try to emit the sub-expression at +1 recursively.
2561 TryEmitResult subresult
2562 = tryEmitARCRetainScalarExpr(CGF, ce->getSubExpr());
2563 result = subresult.getPointer();
2565 // If that produced a retained value, just use that,
2566 // possibly casting down.
2567 if (subresult.getInt()) {
2569 result = CGF.Builder.CreateBitCast(result, resultType);
2570 return TryEmitResult(result, true);
2573 // Otherwise it's +0.
2576 // Retain the object as a block, then cast down.
2577 result = CGF.EmitARCRetainBlock(result, /*mandatory*/ true);
2578 if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
2579 return TryEmitResult(result, true);
2582 // For reclaims, emit the subexpression as a retained call and
2583 // skip the consumption.
2584 case CK_ARCReclaimReturnedObject: {
2585 llvm::Value *result = emitARCRetainCall(CGF, ce->getSubExpr());
2586 if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
2587 return TryEmitResult(result, true);
2594 // Skip __extension__.
2595 } else if (const UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
2596 if (op->getOpcode() == UO_Extension) {
2597 e = op->getSubExpr();
2601 // For calls and message sends, use the retained-call logic.
2602 // Delegate inits are a special case in that they're the only
2603 // returns-retained expression that *isn't* surrounded by
2605 } else if (isa<CallExpr>(e) ||
2606 (isa<ObjCMessageExpr>(e) &&
2607 !cast<ObjCMessageExpr>(e)->isDelegateInitCall())) {
2608 llvm::Value *result = emitARCRetainCall(CGF, e);
2609 if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
2610 return TryEmitResult(result, true);
2612 // Look through pseudo-object expressions.
2613 } else if (const PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
2614 TryEmitResult result
2615 = tryEmitARCRetainPseudoObject(CGF, pseudo);
2617 llvm::Value *value = result.getPointer();
2618 value = CGF.Builder.CreateBitCast(value, resultType);
2619 result.setPointer(value);
2624 // Conservatively halt the search at any other expression kind.
2628 // We didn't find an obvious production, so emit what we've got and
2629 // tell the caller that we didn't manage to retain.
2630 llvm::Value *result = CGF.EmitScalarExpr(e);
2631 if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
2632 return TryEmitResult(result, false);
2635 static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF,
2638 TryEmitResult result = tryEmitARCRetainLoadOfScalar(CGF, lvalue, type);
2639 llvm::Value *value = result.getPointer();
2640 if (!result.getInt())
2641 value = CGF.EmitARCRetain(type, value);
2645 /// EmitARCRetainScalarExpr - Semantically equivalent to
2646 /// EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a
2647 /// best-effort attempt to peephole expressions that naturally produce
2648 /// retained objects.
2649 llvm::Value *CodeGenFunction::EmitARCRetainScalarExpr(const Expr *e) {
2650 TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
2651 llvm::Value *value = result.getPointer();
2652 if (!result.getInt())
2653 value = EmitARCRetain(e->getType(), value);
2658 CodeGenFunction::EmitARCRetainAutoreleaseScalarExpr(const Expr *e) {
2659 TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
2660 llvm::Value *value = result.getPointer();
2661 if (result.getInt())
2662 value = EmitARCAutorelease(value);
2664 value = EmitARCRetainAutorelease(e->getType(), value);
2668 llvm::Value *CodeGenFunction::EmitARCExtendBlockObject(const Expr *e) {
2669 llvm::Value *result;
2672 if (shouldEmitSeparateBlockRetain(e)) {
2673 result = EmitScalarExpr(e);
2676 TryEmitResult subresult = tryEmitARCRetainScalarExpr(*this, e);
2677 result = subresult.getPointer();
2678 doRetain = !subresult.getInt();
2682 result = EmitARCRetainBlock(result, /*mandatory*/ true);
2683 return EmitObjCConsumeObject(e->getType(), result);
2686 llvm::Value *CodeGenFunction::EmitObjCThrowOperand(const Expr *expr) {
2687 // In ARC, retain and autorelease the expression.
2688 if (getLangOpts().ObjCAutoRefCount) {
2689 // Do so before running any cleanups for the full-expression.
2690 // tryEmitARCRetainScalarExpr does make an effort to do things
2691 // inside cleanups, but there are crazy cases like
2693 // where a full retain+autorelease is required and would
2694 // otherwise happen after the destructor for the temporary.
2695 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(expr)) {
2696 enterFullExpression(ewc);
2697 expr = ewc->getSubExpr();
2700 CodeGenFunction::RunCleanupsScope cleanups(*this);
2701 return EmitARCRetainAutoreleaseScalarExpr(expr);
2704 // Otherwise, use the normal scalar-expression emission. The
2705 // exception machinery doesn't do anything special with the
2706 // exception like retaining it, so there's no safety associated with
2707 // only running cleanups after the throw has started, and when it
2708 // matters it tends to be substantially inferior code.
2709 return EmitScalarExpr(expr);
2712 std::pair<LValue,llvm::Value*>
2713 CodeGenFunction::EmitARCStoreStrong(const BinaryOperator *e,
2715 // Evaluate the RHS first.
2716 TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e->getRHS());
2717 llvm::Value *value = result.getPointer();
2719 bool hasImmediateRetain = result.getInt();
2721 // If we didn't emit a retained object, and the l-value is of block
2722 // type, then we need to emit the block-retain immediately in case
2723 // it invalidates the l-value.
2724 if (!hasImmediateRetain && e->getType()->isBlockPointerType()) {
2725 value = EmitARCRetainBlock(value, /*mandatory*/ false);
2726 hasImmediateRetain = true;
2729 LValue lvalue = EmitLValue(e->getLHS());
2731 // If the RHS was emitted retained, expand this.
2732 if (hasImmediateRetain) {
2733 llvm::Value *oldValue =
2734 EmitLoadOfScalar(lvalue);
2735 EmitStoreOfScalar(value, lvalue);
2736 EmitARCRelease(oldValue, /*precise*/ false);
2738 value = EmitARCStoreStrong(lvalue, value, ignored);
2741 return std::pair<LValue,llvm::Value*>(lvalue, value);
2744 std::pair<LValue,llvm::Value*>
2745 CodeGenFunction::EmitARCStoreAutoreleasing(const BinaryOperator *e) {
2746 llvm::Value *value = EmitARCRetainAutoreleaseScalarExpr(e->getRHS());
2747 LValue lvalue = EmitLValue(e->getLHS());
2749 EmitStoreOfScalar(value, lvalue);
2751 return std::pair<LValue,llvm::Value*>(lvalue, value);
2754 void CodeGenFunction::EmitObjCAutoreleasePoolStmt(
2755 const ObjCAutoreleasePoolStmt &ARPS) {
2756 const Stmt *subStmt = ARPS.getSubStmt();
2757 const CompoundStmt &S = cast<CompoundStmt>(*subStmt);
2759 CGDebugInfo *DI = getDebugInfo();
2761 DI->EmitLexicalBlockStart(Builder, S.getLBracLoc());
2763 // Keep track of the current cleanup stack depth.
2764 RunCleanupsScope Scope(*this);
2765 if (CGM.getLangOpts().ObjCRuntime.hasNativeARC()) {
2766 llvm::Value *token = EmitObjCAutoreleasePoolPush();
2767 EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, token);
2769 llvm::Value *token = EmitObjCMRRAutoreleasePoolPush();
2770 EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, token);
2773 for (CompoundStmt::const_body_iterator I = S.body_begin(),
2774 E = S.body_end(); I != E; ++I)
2778 DI->EmitLexicalBlockEnd(Builder, S.getRBracLoc());
2781 /// EmitExtendGCLifetime - Given a pointer to an Objective-C object,
2782 /// make sure it survives garbage collection until this point.
2783 void CodeGenFunction::EmitExtendGCLifetime(llvm::Value *object) {
2784 // We just use an inline assembly.
2785 llvm::FunctionType *extenderType
2786 = llvm::FunctionType::get(VoidTy, VoidPtrTy, RequiredArgs::All);
2787 llvm::Value *extender
2788 = llvm::InlineAsm::get(extenderType,
2790 /* constraints */ "r",
2791 /* side effects */ true);
2793 object = Builder.CreateBitCast(object, VoidPtrTy);
2794 Builder.CreateCall(extender, object)->setDoesNotThrow();
2797 static bool hasAtomicCopyHelperAPI(const ObjCRuntime &runtime) {
2798 // For now, only NeXT has these APIs.
2799 return runtime.isNeXTFamily();
2802 /// GenerateObjCAtomicSetterCopyHelperFunction - Given a c++ object type with
2803 /// non-trivial copy assignment function, produce following helper function.
2804 /// static void copyHelper(Ty *dest, const Ty *source) { *dest = *source; }
2807 CodeGenFunction::GenerateObjCAtomicSetterCopyHelperFunction(
2808 const ObjCPropertyImplDecl *PID) {
2809 // FIXME. This api is for NeXt runtime only for now.
2810 if (!getLangOpts().CPlusPlus ||
2811 !hasAtomicCopyHelperAPI(getLangOpts().ObjCRuntime))
2813 QualType Ty = PID->getPropertyIvarDecl()->getType();
2814 if (!Ty->isRecordType())
2816 const ObjCPropertyDecl *PD = PID->getPropertyDecl();
2817 if ((!(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_atomic)))
2819 llvm::Constant * HelperFn = 0;
2820 if (hasTrivialSetExpr(PID))
2822 assert(PID->getSetterCXXAssignment() && "SetterCXXAssignment - null");
2823 if ((HelperFn = CGM.getAtomicSetterHelperFnMap(Ty)))
2826 ASTContext &C = getContext();
2828 = &CGM.getContext().Idents.get("__assign_helper_atomic_property_");
2829 FunctionDecl *FD = FunctionDecl::Create(C,
2830 C.getTranslationUnitDecl(),
2832 SourceLocation(), II, C.VoidTy, 0,
2838 QualType DestTy = C.getPointerType(Ty);
2839 QualType SrcTy = Ty;
2841 SrcTy = C.getPointerType(SrcTy);
2843 FunctionArgList args;
2844 ImplicitParamDecl dstDecl(FD, SourceLocation(), 0, DestTy);
2845 args.push_back(&dstDecl);
2846 ImplicitParamDecl srcDecl(FD, SourceLocation(), 0, SrcTy);
2847 args.push_back(&srcDecl);
2849 const CGFunctionInfo &FI =
2850 CGM.getTypes().arrangeFunctionDeclaration(C.VoidTy, args,
2851 FunctionType::ExtInfo(),
2854 llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
2856 llvm::Function *Fn =
2857 llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
2858 "__assign_helper_atomic_property_",
2861 // Initialize debug info if needed.
2862 maybeInitializeDebugInfo();
2864 StartFunction(FD, C.VoidTy, Fn, FI, args, SourceLocation());
2866 DeclRefExpr DstExpr(&dstDecl, false, DestTy,
2867 VK_RValue, SourceLocation());
2868 UnaryOperator DST(&DstExpr, UO_Deref, DestTy->getPointeeType(),
2869 VK_LValue, OK_Ordinary, SourceLocation());
2871 DeclRefExpr SrcExpr(&srcDecl, false, SrcTy,
2872 VK_RValue, SourceLocation());
2873 UnaryOperator SRC(&SrcExpr, UO_Deref, SrcTy->getPointeeType(),
2874 VK_LValue, OK_Ordinary, SourceLocation());
2876 Expr *Args[2] = { &DST, &SRC };
2877 CallExpr *CalleeExp = cast<CallExpr>(PID->getSetterCXXAssignment());
2878 CXXOperatorCallExpr TheCall(C, OO_Equal, CalleeExp->getCallee(),
2879 Args, DestTy->getPointeeType(),
2880 VK_LValue, SourceLocation(), false);
2885 HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
2886 CGM.setAtomicSetterHelperFnMap(Ty, HelperFn);
2891 CodeGenFunction::GenerateObjCAtomicGetterCopyHelperFunction(
2892 const ObjCPropertyImplDecl *PID) {
2893 // FIXME. This api is for NeXt runtime only for now.
2894 if (!getLangOpts().CPlusPlus ||
2895 !hasAtomicCopyHelperAPI(getLangOpts().ObjCRuntime))
2897 const ObjCPropertyDecl *PD = PID->getPropertyDecl();
2898 QualType Ty = PD->getType();
2899 if (!Ty->isRecordType())
2901 if ((!(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_atomic)))
2903 llvm::Constant * HelperFn = 0;
2905 if (hasTrivialGetExpr(PID))
2907 assert(PID->getGetterCXXConstructor() && "getGetterCXXConstructor - null");
2908 if ((HelperFn = CGM.getAtomicGetterHelperFnMap(Ty)))
2912 ASTContext &C = getContext();
2914 = &CGM.getContext().Idents.get("__copy_helper_atomic_property_");
2915 FunctionDecl *FD = FunctionDecl::Create(C,
2916 C.getTranslationUnitDecl(),
2918 SourceLocation(), II, C.VoidTy, 0,
2924 QualType DestTy = C.getPointerType(Ty);
2925 QualType SrcTy = Ty;
2927 SrcTy = C.getPointerType(SrcTy);
2929 FunctionArgList args;
2930 ImplicitParamDecl dstDecl(FD, SourceLocation(), 0, DestTy);
2931 args.push_back(&dstDecl);
2932 ImplicitParamDecl srcDecl(FD, SourceLocation(), 0, SrcTy);
2933 args.push_back(&srcDecl);
2935 const CGFunctionInfo &FI =
2936 CGM.getTypes().arrangeFunctionDeclaration(C.VoidTy, args,
2937 FunctionType::ExtInfo(),
2940 llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
2942 llvm::Function *Fn =
2943 llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
2944 "__copy_helper_atomic_property_", &CGM.getModule());
2946 // Initialize debug info if needed.
2947 maybeInitializeDebugInfo();
2949 StartFunction(FD, C.VoidTy, Fn, FI, args, SourceLocation());
2951 DeclRefExpr SrcExpr(&srcDecl, false, SrcTy,
2952 VK_RValue, SourceLocation());
2954 UnaryOperator SRC(&SrcExpr, UO_Deref, SrcTy->getPointeeType(),
2955 VK_LValue, OK_Ordinary, SourceLocation());
2957 CXXConstructExpr *CXXConstExpr =
2958 cast<CXXConstructExpr>(PID->getGetterCXXConstructor());
2960 SmallVector<Expr*, 4> ConstructorArgs;
2961 ConstructorArgs.push_back(&SRC);
2962 CXXConstructExpr::arg_iterator A = CXXConstExpr->arg_begin();
2965 for (CXXConstructExpr::arg_iterator AEnd = CXXConstExpr->arg_end();
2967 ConstructorArgs.push_back(*A);
2969 CXXConstructExpr *TheCXXConstructExpr =
2970 CXXConstructExpr::Create(C, Ty, SourceLocation(),
2971 CXXConstExpr->getConstructor(),
2972 CXXConstExpr->isElidable(),
2974 CXXConstExpr->hadMultipleCandidates(),
2975 CXXConstExpr->isListInitialization(),
2976 CXXConstExpr->requiresZeroInitialization(),
2977 CXXConstExpr->getConstructionKind(),
2980 DeclRefExpr DstExpr(&dstDecl, false, DestTy,
2981 VK_RValue, SourceLocation());
2983 RValue DV = EmitAnyExpr(&DstExpr);
2985 = getContext().getTypeAlignInChars(TheCXXConstructExpr->getType());
2986 EmitAggExpr(TheCXXConstructExpr,
2987 AggValueSlot::forAddr(DV.getScalarVal(), Alignment, Qualifiers(),
2988 AggValueSlot::IsDestructed,
2989 AggValueSlot::DoesNotNeedGCBarriers,
2990 AggValueSlot::IsNotAliased));
2993 HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
2994 CGM.setAtomicGetterHelperFnMap(Ty, HelperFn);
2999 CodeGenFunction::EmitBlockCopyAndAutorelease(llvm::Value *Block, QualType Ty) {
3000 // Get selectors for retain/autorelease.
3001 IdentifierInfo *CopyID = &getContext().Idents.get("copy");
3002 Selector CopySelector =
3003 getContext().Selectors.getNullarySelector(CopyID);
3004 IdentifierInfo *AutoreleaseID = &getContext().Idents.get("autorelease");
3005 Selector AutoreleaseSelector =
3006 getContext().Selectors.getNullarySelector(AutoreleaseID);
3008 // Emit calls to retain/autorelease.
3009 CGObjCRuntime &Runtime = CGM.getObjCRuntime();
3010 llvm::Value *Val = Block;
3012 Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
3014 Val, CallArgList(), 0, 0);
3015 Val = Result.getScalarVal();
3016 Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
3017 Ty, AutoreleaseSelector,
3018 Val, CallArgList(), 0, 0);
3019 Val = Result.getScalarVal();
3024 CGObjCRuntime::~CGObjCRuntime() {}