diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/CodeGen/CGObjC.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/CodeGen/CGObjC.cpp | 1362 |
1 files changed, 873 insertions, 489 deletions
diff --git a/contrib/llvm/tools/clang/lib/CodeGen/CGObjC.cpp b/contrib/llvm/tools/clang/lib/CodeGen/CGObjC.cpp index 426cca0..51f2053 100644 --- a/contrib/llvm/tools/clang/lib/CodeGen/CGObjC.cpp +++ b/contrib/llvm/tools/clang/lib/CodeGen/CGObjC.cpp @@ -33,7 +33,7 @@ tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e); /// Given the address of a variable of pointer type, find the correct /// null to store into it. static llvm::Constant *getNullForVariable(llvm::Value *addr) { - const llvm::Type *type = + llvm::Type *type = cast<llvm::PointerType>(addr->getType())->getElementType(); return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(type)); } @@ -80,6 +80,53 @@ static RValue AdjustRelatedResultType(CodeGenFunction &CGF, CGF.ConvertType(E->getType()))); } +/// Decide whether to extend the lifetime of the receiver of a +/// returns-inner-pointer message. +static bool +shouldExtendReceiverForInnerPointerMessage(const ObjCMessageExpr *message) { + switch (message->getReceiverKind()) { + + // For a normal instance message, we should extend unless the + // receiver is loaded from a variable with precise lifetime. + case ObjCMessageExpr::Instance: { + const Expr *receiver = message->getInstanceReceiver(); + const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(receiver); + if (!ice || ice->getCastKind() != CK_LValueToRValue) return true; + receiver = ice->getSubExpr()->IgnoreParens(); + + // Only __strong variables. + if (receiver->getType().getObjCLifetime() != Qualifiers::OCL_Strong) + return true; + + // All ivars and fields have precise lifetime. + if (isa<MemberExpr>(receiver) || isa<ObjCIvarRefExpr>(receiver)) + return false; + + // Otherwise, check for variables. + const DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(ice->getSubExpr()); + if (!declRef) return true; + const VarDecl *var = dyn_cast<VarDecl>(declRef->getDecl()); + if (!var) return true; + + // All variables have precise lifetime except local variables with + // automatic storage duration that aren't specially marked. + return (var->hasLocalStorage() && + !var->hasAttr<ObjCPreciseLifetimeAttr>()); + } + + case ObjCMessageExpr::Class: + case ObjCMessageExpr::SuperClass: + // It's never necessary for class objects. + return false; + + case ObjCMessageExpr::SuperInstance: + // We generally assume that 'self' lives throughout a method call. + return false; + } + + llvm_unreachable("invalid receiver kind"); +} + RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, ReturnValueSlot Return) { // Only the lookup mechanism and first two arguments of the method @@ -88,6 +135,8 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, bool isDelegateInit = E->isDelegateInitCall(); + const ObjCMethodDecl *method = E->getMethodDecl(); + // We don't retain the receiver in delegate init calls, and this is // safe because the receiver value is always loaded from 'self', // which we zero out. We don't want to Block_copy block receivers, @@ -95,8 +144,8 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, bool retainSelf = (!isDelegateInit && CGM.getLangOptions().ObjCAutoRefCount && - E->getMethodDecl() && - E->getMethodDecl()->hasAttr<NSConsumesSelfAttr>()); + method && + method->hasAttr<NSConsumesSelfAttr>()); CGObjCRuntime &Runtime = CGM.getObjCRuntime(); bool isSuperMessage = false; @@ -112,8 +161,7 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, TryEmitResult ter = tryEmitARCRetainScalarExpr(*this, E->getInstanceReceiver()); Receiver = ter.getPointer(); - if (!ter.getInt()) - Receiver = EmitARCRetainNonBlock(Receiver); + if (ter.getInt()) retainSelf = false; } else Receiver = EmitScalarExpr(E->getInstanceReceiver()); break; @@ -126,9 +174,6 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, assert(OID && "Invalid Objective-C class message send"); Receiver = Runtime.GetClass(Builder, OID); isClassMessage = true; - - if (retainSelf) - Receiver = EmitARCRetainNonBlock(Receiver); break; } @@ -136,9 +181,6 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, ReceiverType = E->getSuperType(); Receiver = LoadObjCSelf(); isSuperMessage = true; - - if (retainSelf) - Receiver = EmitARCRetainNonBlock(Receiver); break; case ObjCMessageExpr::SuperClass: @@ -146,17 +188,25 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, Receiver = LoadObjCSelf(); isSuperMessage = true; isClassMessage = true; - - if (retainSelf) - Receiver = EmitARCRetainNonBlock(Receiver); break; } + if (retainSelf) + Receiver = EmitARCRetainNonBlock(Receiver); + + // In ARC, we sometimes want to "extend the lifetime" + // (i.e. retain+autorelease) of receivers of returns-inner-pointer + // messages. + if (getLangOptions().ObjCAutoRefCount && method && + method->hasAttr<ObjCReturnsInnerPointerAttr>() && + shouldExtendReceiverForInnerPointerMessage(E)) + Receiver = EmitARCRetainAutorelease(ReceiverType, Receiver); + QualType ResultType = - E->getMethodDecl() ? E->getMethodDecl()->getResultType() : E->getType(); + method ? method->getResultType() : E->getType(); CallArgList Args; - EmitCallArgs(Args, E->getMethodDecl(), E->arg_begin(), E->arg_end()); + EmitCallArgs(Args, method, E->arg_begin(), E->arg_end()); // For delegate init calls in ARC, do an unsafe store of null into // self. This represents the call taking direct ownership of that @@ -189,12 +239,12 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, Receiver, isClassMessage, Args, - E->getMethodDecl()); + method); } else { result = Runtime.GenerateMessageSend(*this, Return, ResultType, E->getSelector(), Receiver, Args, OID, - E->getMethodDecl()); + method); } // For delegate init calls in ARC, implicitly store the result of @@ -206,14 +256,14 @@ RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, // The delegate return type isn't necessarily a matching type; in // fact, it's quite likely to be 'id'. - const llvm::Type *selfTy = + llvm::Type *selfTy = cast<llvm::PointerType>(selfAddr->getType())->getElementType(); newSelf = Builder.CreateBitCast(newSelf, selfTy); Builder.CreateStore(newSelf, selfAddr); } - return AdjustRelatedResultType(*this, E, E->getMethodDecl(), result); + return AdjustRelatedResultType(*this, E, method, result); } namespace { @@ -263,7 +313,7 @@ void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD, args.push_back(OMD->getSelfDecl()); args.push_back(OMD->getCmdDecl()); - for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(), + for (ObjCMethodDecl::param_const_iterator PI = OMD->param_begin(), E = OMD->param_end(); PI != E; ++PI) args.push_back(*PI); @@ -285,39 +335,6 @@ void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD, static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF, LValue lvalue, QualType type); -void CodeGenFunction::GenerateObjCGetterBody(ObjCIvarDecl *Ivar, - bool IsAtomic, bool IsStrong) { - LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), - Ivar, 0); - llvm::Value *GetCopyStructFn = - CGM.getObjCRuntime().GetGetStructFunction(); - CodeGenTypes &Types = CGM.getTypes(); - // objc_copyStruct (ReturnValue, &structIvar, - // sizeof (Type of Ivar), isAtomic, false); - CallArgList Args; - RValue RV = RValue::get(Builder.CreateBitCast(ReturnValue, VoidPtrTy)); - Args.add(RV, getContext().VoidPtrTy); - RV = RValue::get(Builder.CreateBitCast(LV.getAddress(), VoidPtrTy)); - Args.add(RV, getContext().VoidPtrTy); - // sizeof (Type of Ivar) - CharUnits Size = getContext().getTypeSizeInChars(Ivar->getType()); - llvm::Value *SizeVal = - llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy), - Size.getQuantity()); - Args.add(RValue::get(SizeVal), getContext().LongTy); - llvm::Value *isAtomic = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), - IsAtomic ? 1 : 0); - Args.add(RValue::get(isAtomic), getContext().BoolTy); - llvm::Value *hasStrong = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), - IsStrong ? 1 : 0); - Args.add(RValue::get(hasStrong), getContext().BoolTy); - EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, - FunctionType::ExtInfo()), - GetCopyStructFn, ReturnValueSlot(), Args); -} - /// Generate an Objective-C method. An Objective-C method is a C function with /// its pointer, name, and types registered in the class struture. void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) { @@ -326,218 +343,599 @@ void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) { FinishFunction(OMD->getBodyRBrace()); } -// FIXME: I wasn't sure about the synthesis approach. If we end up generating an -// AST for the whole body we can just fall back to having a GenerateFunction -// which takes the body Stmt. +/// emitStructGetterCall - Call the runtime function to load a property +/// into the return value slot. +static void emitStructGetterCall(CodeGenFunction &CGF, ObjCIvarDecl *ivar, + bool isAtomic, bool hasStrong) { + ASTContext &Context = CGF.getContext(); + + llvm::Value *src = + CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(), + ivar, 0).getAddress(); + + // objc_copyStruct (ReturnValue, &structIvar, + // sizeof (Type of Ivar), isAtomic, false); + CallArgList args; + + llvm::Value *dest = CGF.Builder.CreateBitCast(CGF.ReturnValue, CGF.VoidPtrTy); + args.add(RValue::get(dest), Context.VoidPtrTy); + + src = CGF.Builder.CreateBitCast(src, CGF.VoidPtrTy); + args.add(RValue::get(src), Context.VoidPtrTy); + + CharUnits size = CGF.getContext().getTypeSizeInChars(ivar->getType()); + args.add(RValue::get(CGF.CGM.getSize(size)), Context.getSizeType()); + args.add(RValue::get(CGF.Builder.getInt1(isAtomic)), Context.BoolTy); + args.add(RValue::get(CGF.Builder.getInt1(hasStrong)), Context.BoolTy); + + llvm::Value *fn = CGF.CGM.getObjCRuntime().GetGetStructFunction(); + CGF.EmitCall(CGF.getTypes().getFunctionInfo(Context.VoidTy, args, + FunctionType::ExtInfo()), + fn, ReturnValueSlot(), args); +} + +/// Determine whether the given architecture supports unaligned atomic +/// accesses. They don't have to be fast, just faster than a function +/// call and a mutex. +static bool hasUnalignedAtomics(llvm::Triple::ArchType arch) { + // FIXME: Allow unaligned atomic load/store on x86. (It is not + // currently supported by the backend.) + return 0; +} + +/// Return the maximum size that permits atomic accesses for the given +/// architecture. +static CharUnits getMaxAtomicAccessSize(CodeGenModule &CGM, + llvm::Triple::ArchType arch) { + // ARM has 8-byte atomic accesses, but it's not clear whether we + // want to rely on them here. + + // In the default case, just assume that any size up to a pointer is + // fine given adequate alignment. + return CharUnits::fromQuantity(CGM.PointerSizeInBytes); +} + +namespace { + class PropertyImplStrategy { + public: + enum StrategyKind { + /// The 'native' strategy is to use the architecture's provided + /// reads and writes. + Native, + + /// Use objc_setProperty and objc_getProperty. + GetSetProperty, + + /// Use objc_setProperty for the setter, but use expression + /// evaluation for the getter. + SetPropertyAndExpressionGet, + + /// Use objc_copyStruct. + CopyStruct, + + /// The 'expression' strategy is to emit normal assignment or + /// lvalue-to-rvalue expressions. + Expression + }; + + StrategyKind getKind() const { return StrategyKind(Kind); } + + bool hasStrongMember() const { return HasStrong; } + bool isAtomic() const { return IsAtomic; } + bool isCopy() const { return IsCopy; } + + CharUnits getIvarSize() const { return IvarSize; } + CharUnits getIvarAlignment() const { return IvarAlignment; } + + PropertyImplStrategy(CodeGenModule &CGM, + const ObjCPropertyImplDecl *propImpl); + + private: + unsigned Kind : 8; + unsigned IsAtomic : 1; + unsigned IsCopy : 1; + unsigned HasStrong : 1; + + CharUnits IvarSize; + CharUnits IvarAlignment; + }; +} + +/// Pick an implementation strategy for the the given property synthesis. +PropertyImplStrategy::PropertyImplStrategy(CodeGenModule &CGM, + const ObjCPropertyImplDecl *propImpl) { + const ObjCPropertyDecl *prop = propImpl->getPropertyDecl(); + ObjCPropertyDecl::SetterKind setterKind = prop->getSetterKind(); + + IsCopy = (setterKind == ObjCPropertyDecl::Copy); + IsAtomic = prop->isAtomic(); + HasStrong = false; // doesn't matter here. + + // Evaluate the ivar's size and alignment. + ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl(); + QualType ivarType = ivar->getType(); + llvm::tie(IvarSize, IvarAlignment) + = CGM.getContext().getTypeInfoInChars(ivarType); + + // If we have a copy property, we always have to use getProperty/setProperty. + // TODO: we could actually use setProperty and an expression for non-atomics. + if (IsCopy) { + Kind = GetSetProperty; + return; + } + + // Handle retain. + if (setterKind == ObjCPropertyDecl::Retain) { + // In GC-only, there's nothing special that needs to be done. + if (CGM.getLangOptions().getGC() == LangOptions::GCOnly) { + // fallthrough + + // In ARC, if the property is non-atomic, use expression emission, + // which translates to objc_storeStrong. This isn't required, but + // it's slightly nicer. + } else if (CGM.getLangOptions().ObjCAutoRefCount && !IsAtomic) { + Kind = Expression; + return; + + // Otherwise, we need to at least use setProperty. However, if + // the property isn't atomic, we can use normal expression + // emission for the getter. + } else if (!IsAtomic) { + Kind = SetPropertyAndExpressionGet; + return; + + // Otherwise, we have to use both setProperty and getProperty. + } else { + Kind = GetSetProperty; + return; + } + } + + // If we're not atomic, just use expression accesses. + if (!IsAtomic) { + Kind = Expression; + return; + } + + // Properties on bitfield ivars need to be emitted using expression + // accesses even if they're nominally atomic. + if (ivar->isBitField()) { + Kind = Expression; + return; + } + + // GC-qualified or ARC-qualified ivars need to be emitted as + // expressions. This actually works out to being atomic anyway, + // except for ARC __strong, but that should trigger the above code. + if (ivarType.hasNonTrivialObjCLifetime() || + (CGM.getLangOptions().getGC() && + CGM.getContext().getObjCGCAttrKind(ivarType))) { + Kind = Expression; + return; + } + + // Compute whether the ivar has strong members. + if (CGM.getLangOptions().getGC()) + if (const RecordType *recordType = ivarType->getAs<RecordType>()) + HasStrong = recordType->getDecl()->hasObjectMember(); + + // We can never access structs with object members with a native + // access, because we need to use write barriers. This is what + // objc_copyStruct is for. + if (HasStrong) { + Kind = CopyStruct; + return; + } + + // Otherwise, this is target-dependent and based on the size and + // alignment of the ivar. + + // If the size of the ivar is not a power of two, give up. We don't + // want to get into the business of doing compare-and-swaps. + if (!IvarSize.isPowerOfTwo()) { + Kind = CopyStruct; + return; + } + + llvm::Triple::ArchType arch = + CGM.getContext().getTargetInfo().getTriple().getArch(); + + // Most architectures require memory to fit within a single cache + // line, so the alignment has to be at least the size of the access. + // Otherwise we have to grab a lock. + if (IvarAlignment < IvarSize && !hasUnalignedAtomics(arch)) { + Kind = CopyStruct; + return; + } + + // If the ivar's size exceeds the architecture's maximum atomic + // access size, we have to use CopyStruct. + if (IvarSize > getMaxAtomicAccessSize(CGM, arch)) { + Kind = CopyStruct; + return; + } + + // Otherwise, we can use native loads and stores. + Kind = Native; +} /// GenerateObjCGetter - Generate an Objective-C property getter /// function. The given Decl must be an ObjCImplementationDecl. @synthesize /// is illegal within a category. void CodeGenFunction::GenerateObjCGetter(ObjCImplementationDecl *IMP, const ObjCPropertyImplDecl *PID) { - ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); const ObjCPropertyDecl *PD = PID->getPropertyDecl(); - bool IsAtomic = - !(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic); ObjCMethodDecl *OMD = PD->getGetterMethodDecl(); assert(OMD && "Invalid call to generate getter (empty method)"); StartObjCMethod(OMD, IMP->getClassInterface(), PID->getLocStart()); - - // Determine if we should use an objc_getProperty call for - // this. Non-atomic properties are directly evaluated. - // atomic 'copy' and 'retain' properties are also directly - // evaluated in gc-only mode. - if (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly && - IsAtomic && - (PD->getSetterKind() == ObjCPropertyDecl::Copy || - PD->getSetterKind() == ObjCPropertyDecl::Retain)) { - llvm::Value *GetPropertyFn = - CGM.getObjCRuntime().GetPropertyGetFunction(); - if (!GetPropertyFn) { - CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy"); - FinishFunction(); + generateObjCGetterBody(IMP, PID); + + FinishFunction(); +} + +static bool hasTrivialGetExpr(const ObjCPropertyImplDecl *propImpl) { + const Expr *getter = propImpl->getGetterCXXConstructor(); + if (!getter) return true; + + // Sema only makes only of these when the ivar has a C++ class type, + // so the form is pretty constrained. + + // If the property has a reference type, we might just be binding a + // reference, in which case the result will be a gl-value. We should + // treat this as a non-trivial operation. + if (getter->isGLValue()) + return false; + + // If we selected a trivial copy-constructor, we're okay. + if (const CXXConstructExpr *construct = dyn_cast<CXXConstructExpr>(getter)) + return (construct->getConstructor()->isTrivial()); + + // The constructor might require cleanups (in which case it's never + // trivial). + assert(isa<ExprWithCleanups>(getter)); + return false; +} + +void +CodeGenFunction::generateObjCGetterBody(const ObjCImplementationDecl *classImpl, + const ObjCPropertyImplDecl *propImpl) { + // If there's a non-trivial 'get' expression, we just have to emit that. + if (!hasTrivialGetExpr(propImpl)) { + ReturnStmt ret(SourceLocation(), propImpl->getGetterCXXConstructor(), + /*nrvo*/ 0); + EmitReturnStmt(ret); + return; + } + + const ObjCPropertyDecl *prop = propImpl->getPropertyDecl(); + QualType propType = prop->getType(); + ObjCMethodDecl *getterMethod = prop->getGetterMethodDecl(); + + ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl(); + + // Pick an implementation strategy. + PropertyImplStrategy strategy(CGM, propImpl); + switch (strategy.getKind()) { + case PropertyImplStrategy::Native: { + LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, 0); + + // Currently, all atomic accesses have to be through integer + // types, so there's no point in trying to pick a prettier type. + llvm::Type *bitcastType = + llvm::Type::getIntNTy(getLLVMContext(), + getContext().toBits(strategy.getIvarSize())); + bitcastType = bitcastType->getPointerTo(); // addrspace 0 okay + + // Perform an atomic load. This does not impose ordering constraints. + llvm::Value *ivarAddr = LV.getAddress(); + ivarAddr = Builder.CreateBitCast(ivarAddr, bitcastType); + llvm::LoadInst *load = Builder.CreateLoad(ivarAddr, "load"); + load->setAlignment(strategy.getIvarAlignment().getQuantity()); + load->setAtomic(llvm::Unordered); + + // Store that value into the return address. Doing this with a + // bitcast is likely to produce some pretty ugly IR, but it's not + // the *most* terrible thing in the world. + Builder.CreateStore(load, Builder.CreateBitCast(ReturnValue, bitcastType)); + + // Make sure we don't do an autorelease. + AutoreleaseResult = false; + return; + } + + case PropertyImplStrategy::GetSetProperty: { + llvm::Value *getPropertyFn = + CGM.getObjCRuntime().GetPropertyGetFunction(); + if (!getPropertyFn) { + CGM.ErrorUnsupported(propImpl, "Obj-C getter requiring atomic copy"); return; } // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true). // FIXME: Can't this be simpler? This might even be worse than the // corresponding gcc code. - CodeGenTypes &Types = CGM.getTypes(); - ValueDecl *Cmd = OMD->getCmdDecl(); - llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd"); - QualType IdTy = getContext().getObjCIdType(); - llvm::Value *SelfAsId = - Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); - llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar); - llvm::Value *True = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); - CallArgList Args; - Args.add(RValue::get(SelfAsId), IdTy); - Args.add(RValue::get(CmdVal), Cmd->getType()); - Args.add(RValue::get(Offset), getContext().getPointerDiffType()); - Args.add(RValue::get(True), getContext().BoolTy); + llvm::Value *cmd = + Builder.CreateLoad(LocalDeclMap[getterMethod->getCmdDecl()], "cmd"); + llvm::Value *self = Builder.CreateBitCast(LoadObjCSelf(), VoidPtrTy); + llvm::Value *ivarOffset = + EmitIvarOffset(classImpl->getClassInterface(), ivar); + + CallArgList args; + args.add(RValue::get(self), getContext().getObjCIdType()); + args.add(RValue::get(cmd), getContext().getObjCSelType()); + args.add(RValue::get(ivarOffset), getContext().getPointerDiffType()); + args.add(RValue::get(Builder.getInt1(strategy.isAtomic())), + getContext().BoolTy); + // FIXME: We shouldn't need to get the function info here, the // runtime already should have computed it to build the function. - RValue RV = EmitCall(Types.getFunctionInfo(PD->getType(), Args, - FunctionType::ExtInfo()), - GetPropertyFn, ReturnValueSlot(), Args); + RValue RV = EmitCall(getTypes().getFunctionInfo(propType, args, + FunctionType::ExtInfo()), + getPropertyFn, ReturnValueSlot(), args); + // We need to fix the type here. Ivars with copy & retain are // always objects so we don't need to worry about complex or // aggregates. RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(), - Types.ConvertType(PD->getType()))); - EmitReturnOfRValue(RV, PD->getType()); + getTypes().ConvertType(propType))); + + EmitReturnOfRValue(RV, propType); // objc_getProperty does an autorelease, so we should suppress ours. AutoreleaseResult = false; - } else { - const llvm::Triple &Triple = getContext().Target.getTriple(); - QualType IVART = Ivar->getType(); - if (IsAtomic && - IVART->isScalarType() && - (Triple.getArch() == llvm::Triple::arm || - Triple.getArch() == llvm::Triple::thumb) && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(4)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCGetterBody(Ivar, true, false); - } - else if (IsAtomic && - (IVART->isScalarType() && !IVART->isRealFloatingType()) && - Triple.getArch() == llvm::Triple::x86 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(4)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCGetterBody(Ivar, true, false); - } - else if (IsAtomic && - (IVART->isScalarType() && !IVART->isRealFloatingType()) && - Triple.getArch() == llvm::Triple::x86_64 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(8)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCGetterBody(Ivar, true, false); - } - else if (IVART->isAnyComplexType()) { - LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), - Ivar, 0); - ComplexPairTy Pair = LoadComplexFromAddr(LV.getAddress(), + + return; + } + + case PropertyImplStrategy::CopyStruct: + emitStructGetterCall(*this, ivar, strategy.isAtomic(), + strategy.hasStrongMember()); + return; + + case PropertyImplStrategy::Expression: + case PropertyImplStrategy::SetPropertyAndExpressionGet: { + LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, 0); + + QualType ivarType = ivar->getType(); + if (ivarType->isAnyComplexType()) { + ComplexPairTy pair = LoadComplexFromAddr(LV.getAddress(), LV.isVolatileQualified()); - StoreComplexToAddr(Pair, ReturnValue, LV.isVolatileQualified()); - } - else if (hasAggregateLLVMType(IVART)) { - bool IsStrong = false; - if ((IsStrong = IvarTypeWithAggrGCObjects(IVART)) - && CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect - && CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCGetterBody(Ivar, IsAtomic, IsStrong); - } - else { - const CXXRecordDecl *classDecl = IVART->getAsCXXRecordDecl(); - - if (PID->getGetterCXXConstructor() && - classDecl && !classDecl->hasTrivialDefaultConstructor()) { - ReturnStmt *Stmt = - new (getContext()) ReturnStmt(SourceLocation(), - PID->getGetterCXXConstructor(), - 0); - EmitReturnStmt(*Stmt); - } else if (IsAtomic && - !IVART->isAnyComplexType() && - Triple.getArch() == llvm::Triple::x86 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(4)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCGetterBody(Ivar, true, false); - } - else if (IsAtomic && - !IVART->isAnyComplexType() && - Triple.getArch() == llvm::Triple::x86_64 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(8)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCGetterBody(Ivar, true, false); - } - else { - LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), - Ivar, 0); - EmitAggregateCopy(ReturnValue, LV.getAddress(), IVART); - } - } - } - else { - LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), - Ivar, 0); - QualType propType = PD->getType(); - - llvm::Value *value; - if (propType->isReferenceType()) { - value = LV.getAddress(); + StoreComplexToAddr(pair, ReturnValue, LV.isVolatileQualified()); + } else if (hasAggregateLLVMType(ivarType)) { + // The return value slot is guaranteed to not be aliased, but + // that's not necessarily the same as "on the stack", so + // we still potentially need objc_memmove_collectable. + EmitAggregateCopy(ReturnValue, LV.getAddress(), ivarType); + } else { + llvm::Value *value; + if (propType->isReferenceType()) { + value = LV.getAddress(); + } else { + // We want to load and autoreleaseReturnValue ARC __weak ivars. + if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) { + value = emitARCRetainLoadOfScalar(*this, LV, ivarType); + + // Otherwise we want to do a simple load, suppressing the + // final autorelease. } else { - // In ARC, we want to emit this retained. - if (getLangOptions().ObjCAutoRefCount && - PD->getType()->isObjCRetainableType()) - value = emitARCRetainLoadOfScalar(*this, LV, IVART); - else - value = EmitLoadOfLValue(LV).getScalarVal(); - - value = Builder.CreateBitCast(value, ConvertType(propType)); + value = EmitLoadOfLValue(LV).getScalarVal(); + AutoreleaseResult = false; } - EmitReturnOfRValue(RValue::get(value), propType); + value = Builder.CreateBitCast(value, ConvertType(propType)); + } + + EmitReturnOfRValue(RValue::get(value), propType); } + return; } - FinishFunction(); + } + llvm_unreachable("bad @property implementation strategy!"); } -void CodeGenFunction::GenerateObjCAtomicSetterBody(ObjCMethodDecl *OMD, - ObjCIvarDecl *Ivar) { +/// emitStructSetterCall - Call the runtime function to store the value +/// from the first formal parameter into the given ivar. +static void emitStructSetterCall(CodeGenFunction &CGF, ObjCMethodDecl *OMD, + ObjCIvarDecl *ivar) { // objc_copyStruct (&structIvar, &Arg, // sizeof (struct something), true, false); - llvm::Value *GetCopyStructFn = - CGM.getObjCRuntime().GetSetStructFunction(); - CodeGenTypes &Types = CGM.getTypes(); - CallArgList Args; - LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), Ivar, 0); - RValue RV = - RValue::get(Builder.CreateBitCast(LV.getAddress(), - Types.ConvertType(getContext().VoidPtrTy))); - Args.add(RV, getContext().VoidPtrTy); - llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()]; - llvm::Value *ArgAsPtrTy = - Builder.CreateBitCast(Arg, - Types.ConvertType(getContext().VoidPtrTy)); - RV = RValue::get(ArgAsPtrTy); - Args.add(RV, getContext().VoidPtrTy); - // sizeof (Type of Ivar) - CharUnits Size = getContext().getTypeSizeInChars(Ivar->getType()); - llvm::Value *SizeVal = - llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy), - Size.getQuantity()); - Args.add(RValue::get(SizeVal), getContext().LongTy); - llvm::Value *True = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); - Args.add(RValue::get(True), getContext().BoolTy); - llvm::Value *False = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0); - Args.add(RValue::get(False), getContext().BoolTy); - EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, - FunctionType::ExtInfo()), - GetCopyStructFn, ReturnValueSlot(), Args); + CallArgList args; + + // The first argument is the address of the ivar. + llvm::Value *ivarAddr = CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), + CGF.LoadObjCSelf(), ivar, 0) + .getAddress(); + ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy); + args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy); + + // The second argument is the address of the parameter variable. + ParmVarDecl *argVar = *OMD->param_begin(); + DeclRefExpr argRef(argVar, argVar->getType(), VK_LValue, SourceLocation()); + llvm::Value *argAddr = CGF.EmitLValue(&argRef).getAddress(); + argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy); + args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy); + + // The third argument is the sizeof the type. + llvm::Value *size = + CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(ivar->getType())); + args.add(RValue::get(size), CGF.getContext().getSizeType()); + + // The fourth argument is the 'isAtomic' flag. + args.add(RValue::get(CGF.Builder.getTrue()), CGF.getContext().BoolTy); + + // The fifth argument is the 'hasStrong' flag. + // FIXME: should this really always be false? + args.add(RValue::get(CGF.Builder.getFalse()), CGF.getContext().BoolTy); + + llvm::Value *copyStructFn = CGF.CGM.getObjCRuntime().GetSetStructFunction(); + CGF.EmitCall(CGF.getTypes().getFunctionInfo(CGF.getContext().VoidTy, args, + FunctionType::ExtInfo()), + copyStructFn, ReturnValueSlot(), args); +} + +static bool hasTrivialSetExpr(const ObjCPropertyImplDecl *PID) { + Expr *setter = PID->getSetterCXXAssignment(); + if (!setter) return true; + + // Sema only makes only of these when the ivar has a C++ class type, + // so the form is pretty constrained. + + // An operator call is trivial if the function it calls is trivial. + // This also implies that there's nothing non-trivial going on with + // the arguments, because operator= can only be trivial if it's a + // synthesized assignment operator and therefore both parameters are + // references. + if (CallExpr *call = dyn_cast<CallExpr>(setter)) { + if (const FunctionDecl *callee + = dyn_cast_or_null<FunctionDecl>(call->getCalleeDecl())) + if (callee->isTrivial()) + return true; + return false; + } + + assert(isa<ExprWithCleanups>(setter)); + return false; } -static bool -IvarAssignHasTrvialAssignment(const ObjCPropertyImplDecl *PID, - QualType IvarT) { - bool HasTrvialAssignment = true; - if (PID->getSetterCXXAssignment()) { - const CXXRecordDecl *classDecl = IvarT->getAsCXXRecordDecl(); - HasTrvialAssignment = - (!classDecl || classDecl->hasTrivialCopyAssignment()); +void +CodeGenFunction::generateObjCSetterBody(const ObjCImplementationDecl *classImpl, + const ObjCPropertyImplDecl *propImpl) { + // Just use the setter expression if Sema gave us one and it's + // non-trivial. There's no way to do this atomically. + if (!hasTrivialSetExpr(propImpl)) { + EmitStmt(propImpl->getSetterCXXAssignment()); + return; + } + + const ObjCPropertyDecl *prop = propImpl->getPropertyDecl(); + ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl(); + ObjCMethodDecl *setterMethod = prop->getSetterMethodDecl(); + + PropertyImplStrategy strategy(CGM, propImpl); + switch (strategy.getKind()) { + case PropertyImplStrategy::Native: { + llvm::Value *argAddr = LocalDeclMap[*setterMethod->param_begin()]; + + LValue ivarLValue = + EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, /*quals*/ 0); + llvm::Value *ivarAddr = ivarLValue.getAddress(); + + // Currently, all atomic accesses have to be through integer + // types, so there's no point in trying to pick a prettier type. + llvm::Type *bitcastType = + llvm::Type::getIntNTy(getLLVMContext(), + getContext().toBits(strategy.getIvarSize())); + bitcastType = bitcastType->getPointerTo(); // addrspace 0 okay + + // Cast both arguments to the chosen operation type. + argAddr = Builder.CreateBitCast(argAddr, bitcastType); + ivarAddr = Builder.CreateBitCast(ivarAddr, bitcastType); + + // This bitcast load is likely to cause some nasty IR. + llvm::Value *load = Builder.CreateLoad(argAddr); + + // Perform an atomic store. There are no memory ordering requirements. + llvm::StoreInst *store = Builder.CreateStore(load, ivarAddr); + store->setAlignment(strategy.getIvarAlignment().getQuantity()); + store->setAtomic(llvm::Unordered); + return; + } + + case PropertyImplStrategy::GetSetProperty: + case PropertyImplStrategy::SetPropertyAndExpressionGet: { + llvm::Value *setPropertyFn = + CGM.getObjCRuntime().GetPropertySetFunction(); + if (!setPropertyFn) { + CGM.ErrorUnsupported(propImpl, "Obj-C setter requiring atomic copy"); + return; + } + + // Emit objc_setProperty((id) self, _cmd, offset, arg, + // <is-atomic>, <is-copy>). + llvm::Value *cmd = + Builder.CreateLoad(LocalDeclMap[setterMethod->getCmdDecl()]); + llvm::Value *self = + Builder.CreateBitCast(LoadObjCSelf(), VoidPtrTy); + llvm::Value *ivarOffset = + EmitIvarOffset(classImpl->getClassInterface(), ivar); + llvm::Value *arg = LocalDeclMap[*setterMethod->param_begin()]; + arg = Builder.CreateBitCast(Builder.CreateLoad(arg, "arg"), VoidPtrTy); + + CallArgList args; + args.add(RValue::get(self), getContext().getObjCIdType()); + args.add(RValue::get(cmd), getContext().getObjCSelType()); + args.add(RValue::get(ivarOffset), getContext().getPointerDiffType()); + args.add(RValue::get(arg), getContext().getObjCIdType()); + args.add(RValue::get(Builder.getInt1(strategy.isAtomic())), + getContext().BoolTy); + args.add(RValue::get(Builder.getInt1(strategy.isCopy())), + getContext().BoolTy); + // FIXME: We shouldn't need to get the function info here, the runtime + // already should have computed it to build the function. + EmitCall(getTypes().getFunctionInfo(getContext().VoidTy, args, + FunctionType::ExtInfo()), + setPropertyFn, ReturnValueSlot(), args); + return; + } + + case PropertyImplStrategy::CopyStruct: + emitStructSetterCall(*this, setterMethod, ivar); + return; + + case PropertyImplStrategy::Expression: + break; + } + + // Otherwise, fake up some ASTs and emit a normal assignment. + ValueDecl *selfDecl = setterMethod->getSelfDecl(); + DeclRefExpr self(selfDecl, selfDecl->getType(), VK_LValue, SourceLocation()); + ImplicitCastExpr selfLoad(ImplicitCastExpr::OnStack, + selfDecl->getType(), CK_LValueToRValue, &self, + VK_RValue); + ObjCIvarRefExpr ivarRef(ivar, ivar->getType().getNonReferenceType(), + SourceLocation(), &selfLoad, true, true); + + ParmVarDecl *argDecl = *setterMethod->param_begin(); + QualType argType = argDecl->getType().getNonReferenceType(); + DeclRefExpr arg(argDecl, argType, VK_LValue, SourceLocation()); + ImplicitCastExpr argLoad(ImplicitCastExpr::OnStack, + argType.getUnqualifiedType(), CK_LValueToRValue, + &arg, VK_RValue); + + // The property type can differ from the ivar type in some situations with + // Objective-C pointer types, we can always bit cast the RHS in these cases. + // The following absurdity is just to ensure well-formed IR. + CastKind argCK = CK_NoOp; + if (ivarRef.getType()->isObjCObjectPointerType()) { + if (argLoad.getType()->isObjCObjectPointerType()) + argCK = CK_BitCast; + else if (argLoad.getType()->isBlockPointerType()) + argCK = CK_BlockPointerToObjCPointerCast; + else + argCK = CK_CPointerToObjCPointerCast; + } else if (ivarRef.getType()->isBlockPointerType()) { + if (argLoad.getType()->isBlockPointerType()) + argCK = CK_BitCast; + else + argCK = CK_AnyPointerToBlockPointerCast; + } else if (ivarRef.getType()->isPointerType()) { + argCK = CK_BitCast; } - return HasTrvialAssignment; + ImplicitCastExpr argCast(ImplicitCastExpr::OnStack, + ivarRef.getType(), argCK, &argLoad, + VK_RValue); + Expr *finalArg = &argLoad; + if (!getContext().hasSameUnqualifiedType(ivarRef.getType(), + argLoad.getType())) + finalArg = &argCast; + + + BinaryOperator assign(&ivarRef, finalArg, BO_Assign, + ivarRef.getType(), VK_RValue, OK_Ordinary, + SourceLocation()); + EmitStmt(&assign); } /// GenerateObjCSetter - Generate an Objective-C property setter @@ -545,136 +943,12 @@ IvarAssignHasTrvialAssignment(const ObjCPropertyImplDecl *PID, /// is illegal within a category. void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP, const ObjCPropertyImplDecl *PID) { - ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); const ObjCPropertyDecl *PD = PID->getPropertyDecl(); ObjCMethodDecl *OMD = PD->getSetterMethodDecl(); assert(OMD && "Invalid call to generate setter (empty method)"); StartObjCMethod(OMD, IMP->getClassInterface(), PID->getLocStart()); - const llvm::Triple &Triple = getContext().Target.getTriple(); - QualType IVART = Ivar->getType(); - bool IsCopy = PD->getSetterKind() == ObjCPropertyDecl::Copy; - bool IsAtomic = - !(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic); - - // Determine if we should use an objc_setProperty call for - // this. Properties with 'copy' semantics always use it, as do - // non-atomic properties with 'release' semantics as long as we are - // not in gc-only mode. - if (IsCopy || - (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly && - PD->getSetterKind() == ObjCPropertyDecl::Retain)) { - llvm::Value *SetPropertyFn = - CGM.getObjCRuntime().GetPropertySetFunction(); - - if (!SetPropertyFn) { - CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy"); - FinishFunction(); - return; - } - // Emit objc_setProperty((id) self, _cmd, offset, arg, - // <is-atomic>, <is-copy>). - // FIXME: Can't this be simpler? This might even be worse than the - // corresponding gcc code. - CodeGenTypes &Types = CGM.getTypes(); - ValueDecl *Cmd = OMD->getCmdDecl(); - llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd"); - QualType IdTy = getContext().getObjCIdType(); - llvm::Value *SelfAsId = - Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); - llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar); - llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()]; - llvm::Value *ArgAsId = - Builder.CreateBitCast(Builder.CreateLoad(Arg, "arg"), - Types.ConvertType(IdTy)); - llvm::Value *True = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); - llvm::Value *False = - llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0); - CallArgList Args; - Args.add(RValue::get(SelfAsId), IdTy); - Args.add(RValue::get(CmdVal), Cmd->getType()); - Args.add(RValue::get(Offset), getContext().getPointerDiffType()); - Args.add(RValue::get(ArgAsId), IdTy); - Args.add(RValue::get(IsAtomic ? True : False), getContext().BoolTy); - Args.add(RValue::get(IsCopy ? True : False), getContext().BoolTy); - // FIXME: We shouldn't need to get the function info here, the runtime - // already should have computed it to build the function. - EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, - FunctionType::ExtInfo()), - SetPropertyFn, - ReturnValueSlot(), Args); - } else if (IsAtomic && hasAggregateLLVMType(IVART) && - !IVART->isAnyComplexType() && - IvarAssignHasTrvialAssignment(PID, IVART) && - ((Triple.getArch() == llvm::Triple::x86 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(4))) || - (Triple.getArch() == llvm::Triple::x86_64 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(8)))) - && CGM.getObjCRuntime().GetSetStructFunction()) { - // objc_copyStruct (&structIvar, &Arg, - // sizeof (struct something), true, false); - GenerateObjCAtomicSetterBody(OMD, Ivar); - } else if (PID->getSetterCXXAssignment()) { - EmitIgnoredExpr(PID->getSetterCXXAssignment()); - } else { - if (IsAtomic && - IVART->isScalarType() && - (Triple.getArch() == llvm::Triple::arm || - Triple.getArch() == llvm::Triple::thumb) && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(4)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCAtomicSetterBody(OMD, Ivar); - } - else if (IsAtomic && - (IVART->isScalarType() && !IVART->isRealFloatingType()) && - Triple.getArch() == llvm::Triple::x86 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(4)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCAtomicSetterBody(OMD, Ivar); - } - else if (IsAtomic && - (IVART->isScalarType() && !IVART->isRealFloatingType()) && - Triple.getArch() == llvm::Triple::x86_64 && - (getContext().getTypeSizeInChars(IVART) - > CharUnits::fromQuantity(8)) && - CGM.getObjCRuntime().GetGetStructFunction()) { - GenerateObjCAtomicSetterBody(OMD, Ivar); - } - else { - // FIXME: Find a clean way to avoid AST node creation. - SourceLocation Loc = PID->getLocStart(); - ValueDecl *Self = OMD->getSelfDecl(); - ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); - DeclRefExpr Base(Self, Self->getType(), VK_RValue, Loc); - ParmVarDecl *ArgDecl = *OMD->param_begin(); - QualType T = ArgDecl->getType(); - if (T->isReferenceType()) - T = cast<ReferenceType>(T)->getPointeeType(); - DeclRefExpr Arg(ArgDecl, T, VK_LValue, Loc); - ObjCIvarRefExpr IvarRef(Ivar, Ivar->getType(), Loc, &Base, true, true); - - // The property type can differ from the ivar type in some situations with - // Objective-C pointer types, we can always bit cast the RHS in these cases. - if (getContext().getCanonicalType(Ivar->getType()) != - getContext().getCanonicalType(ArgDecl->getType())) { - ImplicitCastExpr ArgCasted(ImplicitCastExpr::OnStack, - Ivar->getType(), CK_BitCast, &Arg, - VK_RValue); - BinaryOperator Assign(&IvarRef, &ArgCasted, BO_Assign, - Ivar->getType(), VK_RValue, OK_Ordinary, Loc); - EmitStmt(&Assign); - } else { - BinaryOperator Assign(&IvarRef, &Arg, BO_Assign, - Ivar->getType(), VK_RValue, OK_Ordinary, Loc); - EmitStmt(&Assign); - } - } - } + generateObjCSetterBody(IMP, PID); FinishFunction(); } @@ -716,9 +990,8 @@ static void emitCXXDestructMethod(CodeGenFunction &CGF, llvm::Value *self = CGF.LoadObjCSelf(); - ObjCInterfaceDecl *iface - = const_cast<ObjCInterfaceDecl*>(impl->getClassInterface()); - for (ObjCIvarDecl *ivar = iface->all_declared_ivar_begin(); + const ObjCInterfaceDecl *iface = impl->getClassInterface(); + for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin(); ivar; ivar = ivar->getNextIvar()) { QualType type = ivar->getType(); @@ -758,7 +1031,7 @@ void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, // Suppress the final autorelease in ARC. AutoreleaseResult = false; - llvm::SmallVector<CXXCtorInitializer *, 8> IvarInitializers; + SmallVector<CXXCtorInitializer *, 8> IvarInitializers; for (ObjCImplementationDecl::init_const_iterator B = IMP->init_begin(), E = IMP->init_end(); B != E; ++B) { CXXCtorInitializer *IvarInit = (*B); @@ -766,7 +1039,10 @@ void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field); LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), Ivar, 0); - EmitAggExpr(IvarInit->getInit(), AggValueSlot::forLValue(LV, true)); + EmitAggExpr(IvarInit->getInit(), + AggValueSlot::forLValue(LV, AggValueSlot::IsDestructed, + AggValueSlot::DoesNotNeedGCBarriers, + AggValueSlot::IsNotAliased)); } // constructor returns 'self'. CodeGenTypes &Types = CGM.getTypes(); @@ -791,7 +1067,7 @@ bool CodeGenFunction::IndirectObjCSetterArg(const CGFunctionInfo &FI) { } bool CodeGenFunction::IvarTypeWithAggrGCObjects(QualType Ty) { - if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) + if (CGM.getLangOptions().getGC() == LangOptions::NonGC) return false; if (const RecordType *FDTTy = Ty.getTypePtr()->getAs<RecordType>()) return FDTTy->getDecl()->hasObjectMember(); @@ -896,7 +1172,7 @@ void CodeGenFunction::EmitStoreThroughPropertyRefLValue(RValue Src, if (Src.isScalar()) { llvm::Value *SrcVal = Src.getScalarVal(); QualType DstType = getContext().getCanonicalType(ArgType); - const llvm::Type *DstTy = ConvertType(DstType); + llvm::Type *DstTy = ConvertType(DstType); if (SrcVal->getType() != DstTy) Src = RValue::get(EmitScalarConversion(SrcVal, E->getType(), DstType)); @@ -932,10 +1208,8 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ } CGDebugInfo *DI = getDebugInfo(); - if (DI) { - DI->setLocation(S.getSourceRange().getBegin()); - DI->EmitRegionStart(Builder); - } + if (DI) + DI->EmitLexicalBlockStart(Builder, S.getSourceRange().getBegin()); // The local variable comes into scope immediately. AutoVarEmission variable = AutoVarEmission::invalid(); @@ -943,10 +1217,9 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ variable = EmitAutoVarAlloca(*cast<VarDecl>(SD->getSingleDecl())); JumpDest LoopEnd = getJumpDestInCurrentScope("forcoll.end"); - JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next"); // Fast enumeration state. - QualType StateTy = getContext().getObjCFastEnumerationStateType(); + QualType StateTy = CGM.getObjCFastEnumerationStateType(); llvm::Value *StatePtr = CreateMemTemp(StateTy, "state.ptr"); EmitNullInitialization(StatePtr, StateTy); @@ -968,8 +1241,20 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ ArrayType::Normal, 0); llvm::Value *ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr"); - // Emit the collection pointer. - llvm::Value *Collection = EmitScalarExpr(S.getCollection()); + // Emit the collection pointer. In ARC, we do a retain. + llvm::Value *Collection; + if (getLangOptions().ObjCAutoRefCount) { + Collection = EmitARCRetainScalarExpr(S.getCollection()); + + // Enter a cleanup to do the release. + EmitObjCConsumeObject(S.getCollection()->getType(), Collection); + } else { + Collection = EmitScalarExpr(S.getCollection()); + } + + // The 'continue' label needs to appear within the cleanup for the + // collection object. + JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next"); // Send it our message: CallArgList Args; @@ -985,7 +1270,7 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ Args.add(RValue::get(ItemsPtr), getContext().getPointerType(ItemsTy)); // The third argument is the capacity of that temporary array. - const llvm::Type *UnsignedLongLTy = ConvertType(getContext().UnsignedLongTy); + llvm::Type *UnsignedLongLTy = ConvertType(getContext().UnsignedLongTy); llvm::Constant *Count = llvm::ConstantInt::get(UnsignedLongLTy, NumItems); Args.add(RValue::get(Count), getContext().UnsignedLongTy); @@ -1053,8 +1338,7 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ EmitBlock(WasMutatedBB); llvm::Value *V = Builder.CreateBitCast(Collection, - ConvertType(getContext().getObjCIdType()), - "tmp"); + ConvertType(getContext().getObjCIdType())); CallArgList Args2; Args2.add(RValue::get(V), getContext().getObjCIdType()); // FIXME: We shouldn't need to get the function info here, the runtime already @@ -1089,7 +1373,7 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ elementType = cast<Expr>(S.getElement())->getType(); elementIsVariable = false; } - const llvm::Type *convertedElementType = ConvertType(elementType); + llvm::Type *convertedElementType = ConvertType(elementType); // Fetch the buffer out of the enumeration state. // TODO: this pointer should actually be invariant between @@ -1179,10 +1463,12 @@ void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ EmitStoreThroughLValue(RValue::get(null), elementLValue); } - if (DI) { - DI->setLocation(S.getSourceRange().getEnd()); - DI->EmitRegionEnd(Builder); - } + if (DI) + DI->EmitLexicalBlockEnd(Builder, S.getSourceRange().getEnd()); + + // Leave the cleanup we entered in ARC. + if (getLangOptions().ObjCAutoRefCount) + PopCleanupBlock(); EmitBlock(LoopEnd.getBlock()); } @@ -1200,7 +1486,7 @@ void CodeGenFunction::EmitObjCAtSynchronizedStmt( CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S); } -/// Produce the code for a CK_ObjCProduceObject. Just does a +/// Produce the code for a CK_ARCProduceObject. Just does a /// primitive retain. llvm::Value *CodeGenFunction::EmitObjCProduceObject(QualType type, llvm::Value *value) { @@ -1209,63 +1495,22 @@ llvm::Value *CodeGenFunction::EmitObjCProduceObject(QualType type, namespace { struct CallObjCRelease : EHScopeStack::Cleanup { - CallObjCRelease(QualType type, llvm::Value *ptr, llvm::Value *condition) - : type(type), ptr(ptr), condition(condition) {} - QualType type; - llvm::Value *ptr; - llvm::Value *condition; + CallObjCRelease(llvm::Value *object) : object(object) {} + llvm::Value *object; void Emit(CodeGenFunction &CGF, Flags flags) { - llvm::Value *object; - - // If we're in a conditional branch, we had to stash away in an - // alloca the pointer to be released. - llvm::BasicBlock *cont = 0; - if (condition) { - llvm::BasicBlock *release = CGF.createBasicBlock("release.yes"); - cont = CGF.createBasicBlock("release.cont"); - - llvm::Value *cond = CGF.Builder.CreateLoad(condition); - CGF.Builder.CreateCondBr(cond, release, cont); - CGF.EmitBlock(release); - object = CGF.Builder.CreateLoad(ptr); - } else { - object = ptr; - } - CGF.EmitARCRelease(object, /*precise*/ true); - - if (cont) CGF.EmitBlock(cont); } }; } -/// Produce the code for a CK_ObjCConsumeObject. Does a primitive +/// Produce the code for a CK_ARCConsumeObject. Does a primitive /// release at the end of the full-expression. llvm::Value *CodeGenFunction::EmitObjCConsumeObject(QualType type, llvm::Value *object) { // If we're in a conditional branch, we need to make the cleanup - // conditional. FIXME: this really needs to be supported by the - // environment. - llvm::AllocaInst *cond; - llvm::Value *ptr; - if (isInConditionalBranch()) { - cond = CreateTempAlloca(Builder.getInt1Ty(), "release.cond"); - ptr = CreateTempAlloca(object->getType(), "release.value"); - - // The alloca is false until we get here. - // FIXME: er. doesn't this need to be set at the start of the condition? - InitTempAlloca(cond, Builder.getFalse()); - - // Then it turns true. - Builder.CreateStore(Builder.getTrue(), cond); - Builder.CreateStore(object, ptr); - } else { - cond = 0; - ptr = object; - } - - EHStack.pushCleanup<CallObjCRelease>(getARCCleanupKind(), type, ptr, cond); + // conditional. + pushFullExprCleanup<CallObjCRelease>(getARCCleanupKind(), object); return object; } @@ -1276,8 +1521,8 @@ llvm::Value *CodeGenFunction::EmitObjCExtendObjectLifetime(QualType type, static llvm::Constant *createARCRuntimeFunction(CodeGenModule &CGM, - const llvm::FunctionType *type, - llvm::StringRef fnName) { + llvm::FunctionType *type, + StringRef fnName) { llvm::Constant *fn = CGM.CreateRuntimeFunction(type, fnName); // In -fobjc-no-arc-runtime, emit weak references to the runtime @@ -1295,18 +1540,18 @@ static llvm::Constant *createARCRuntimeFunction(CodeGenModule &CGM, static llvm::Value *emitARCValueOperation(CodeGenFunction &CGF, llvm::Value *value, llvm::Constant *&fn, - llvm::StringRef fnName) { + StringRef fnName) { if (isa<llvm::ConstantPointerNull>(value)) return value; if (!fn) { std::vector<llvm::Type*> args(1, CGF.Int8PtrTy); - const llvm::FunctionType *fnType = + llvm::FunctionType *fnType = llvm::FunctionType::get(CGF.Int8PtrTy, args, false); fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName); } // Cast the argument to 'id'. - const llvm::Type *origType = value->getType(); + llvm::Type *origType = value->getType(); value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy); // Call the function. @@ -1322,16 +1567,16 @@ static llvm::Value *emitARCValueOperation(CodeGenFunction &CGF, static llvm::Value *emitARCLoadOperation(CodeGenFunction &CGF, llvm::Value *addr, llvm::Constant *&fn, - llvm::StringRef fnName) { + StringRef fnName) { if (!fn) { std::vector<llvm::Type*> args(1, CGF.Int8PtrPtrTy); - const llvm::FunctionType *fnType = + llvm::FunctionType *fnType = llvm::FunctionType::get(CGF.Int8PtrTy, args, false); fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName); } // Cast the argument to 'id*'. - const llvm::Type *origType = addr->getType(); + llvm::Type *origType = addr->getType(); addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy); // Call the function. @@ -1353,7 +1598,7 @@ static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF, llvm::Value *addr, llvm::Value *value, llvm::Constant *&fn, - llvm::StringRef fnName, + StringRef fnName, bool ignored) { assert(cast<llvm::PointerType>(addr->getType())->getElementType() == value->getType()); @@ -1363,12 +1608,12 @@ static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF, argTypes[0] = CGF.Int8PtrPtrTy; argTypes[1] = CGF.Int8PtrTy; - const llvm::FunctionType *fnType + llvm::FunctionType *fnType = llvm::FunctionType::get(CGF.Int8PtrTy, argTypes, false); fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName); } - const llvm::Type *origType = value->getType(); + llvm::Type *origType = value->getType(); addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy); value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy); @@ -1387,12 +1632,12 @@ static void emitARCCopyOperation(CodeGenFunction &CGF, llvm::Value *dst, llvm::Value *src, llvm::Constant *&fn, - llvm::StringRef fnName) { + StringRef fnName) { assert(dst->getType() == src->getType()); if (!fn) { std::vector<llvm::Type*> argTypes(2, CGF.Int8PtrPtrTy); - const llvm::FunctionType *fnType + llvm::FunctionType *fnType = llvm::FunctionType::get(CGF.Builder.getVoidTy(), argTypes, false); fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName); } @@ -1409,7 +1654,7 @@ static void emitARCCopyOperation(CodeGenFunction &CGF, /// call i8* @objc_retainBlock(i8* %value) llvm::Value *CodeGenFunction::EmitARCRetain(QualType type, llvm::Value *value) { if (type->isBlockPointerType()) - return EmitARCRetainBlock(value); + return EmitARCRetainBlock(value, /*mandatory*/ false); else return EmitARCRetainNonBlock(value); } @@ -1424,10 +1669,32 @@ llvm::Value *CodeGenFunction::EmitARCRetainNonBlock(llvm::Value *value) { /// Retain the given block, with _Block_copy semantics. /// call i8* @objc_retainBlock(i8* %value) -llvm::Value *CodeGenFunction::EmitARCRetainBlock(llvm::Value *value) { - return emitARCValueOperation(*this, value, - CGM.getARCEntrypoints().objc_retainBlock, - "objc_retainBlock"); +/// +/// \param mandatory - If false, emit the call with metadata +/// indicating that it's okay for the optimizer to eliminate this call +/// if it can prove that the block never escapes except down the stack. +llvm::Value *CodeGenFunction::EmitARCRetainBlock(llvm::Value *value, + bool mandatory) { + llvm::Value *result + = emitARCValueOperation(*this, value, + CGM.getARCEntrypoints().objc_retainBlock, + "objc_retainBlock"); + + // If the copy isn't mandatory, add !clang.arc.copy_on_escape to + // tell the optimizer that it doesn't need to do this copy if the + // block doesn't escape, where being passed as an argument doesn't + // count as escaping. + if (!mandatory && isa<llvm::Instruction>(result)) { + llvm::CallInst *call + = cast<llvm::CallInst>(result->stripPointerCasts()); + assert(call->getCalledValue() == CGM.getARCEntrypoints().objc_retainBlock); + + SmallVector<llvm::Value*,1> args; + call->setMetadata("clang.arc.copy_on_escape", + llvm::MDNode::get(Builder.getContext(), args)); + } + + return result; } /// Retain the given object which is the result of a function call. @@ -1442,7 +1709,7 @@ CodeGenFunction::EmitARCRetainAutoreleasedReturnValue(llvm::Value *value) { llvm::InlineAsm *&marker = CGM.getARCEntrypoints().retainAutoreleasedReturnValueMarker; if (!marker) { - llvm::StringRef assembly + StringRef assembly = CGM.getTargetCodeGenInfo() .getARCRetainAutoreleasedReturnValueMarker(); @@ -1468,8 +1735,7 @@ CodeGenFunction::EmitARCRetainAutoreleasedReturnValue(llvm::Value *value) { assert(metadata->getNumOperands() <= 1); if (metadata->getNumOperands() == 0) { llvm::Value *string = llvm::MDString::get(getLLVMContext(), assembly); - llvm::Value *args[] = { string }; - metadata->addOperand(llvm::MDNode::get(getLLVMContext(), args)); + metadata->addOperand(llvm::MDNode::get(getLLVMContext(), string)); } } } @@ -1490,7 +1756,7 @@ void CodeGenFunction::EmitARCRelease(llvm::Value *value, bool precise) { llvm::Constant *&fn = CGM.getARCEntrypoints().objc_release; if (!fn) { std::vector<llvm::Type*> args(1, Int8PtrTy); - const llvm::FunctionType *fnType = + llvm::FunctionType *fnType = llvm::FunctionType::get(Builder.getVoidTy(), args, false); fn = createARCRuntimeFunction(CGM, fnType, "objc_release"); } @@ -1503,7 +1769,7 @@ void CodeGenFunction::EmitARCRelease(llvm::Value *value, bool precise) { call->setDoesNotThrow(); if (!precise) { - llvm::SmallVector<llvm::Value*,1> args; + SmallVector<llvm::Value*,1> args; call->setMetadata("clang.imprecise_release", llvm::MDNode::get(Builder.getContext(), args)); } @@ -1520,7 +1786,7 @@ llvm::Value *CodeGenFunction::EmitARCStoreStrongCall(llvm::Value *addr, llvm::Constant *&fn = CGM.getARCEntrypoints().objc_storeStrong; if (!fn) { llvm::Type *argTypes[] = { Int8PtrPtrTy, Int8PtrTy }; - const llvm::FunctionType *fnType + llvm::FunctionType *fnType = llvm::FunctionType::get(Builder.getVoidTy(), argTypes, false); fn = createARCRuntimeFunction(CGM, fnType, "objc_storeStrong"); } @@ -1607,9 +1873,9 @@ llvm::Value *CodeGenFunction::EmitARCRetainAutorelease(QualType type, if (isa<llvm::ConstantPointerNull>(value)) return value; - const llvm::Type *origType = value->getType(); + llvm::Type *origType = value->getType(); value = Builder.CreateBitCast(value, Int8PtrTy); - value = EmitARCRetainBlock(value); + value = EmitARCRetainBlock(value, /*mandatory*/ true); value = EmitARCAutorelease(value); return Builder.CreateBitCast(value, origType); } @@ -1674,7 +1940,7 @@ void CodeGenFunction::EmitARCDestroyWeak(llvm::Value *addr) { llvm::Constant *&fn = CGM.getARCEntrypoints().objc_destroyWeak; if (!fn) { std::vector<llvm::Type*> args(1, Int8PtrPtrTy); - const llvm::FunctionType *fnType = + llvm::FunctionType *fnType = llvm::FunctionType::get(Builder.getVoidTy(), args, false); fn = createARCRuntimeFunction(CGM, fnType, "objc_destroyWeak"); } @@ -1709,7 +1975,7 @@ void CodeGenFunction::EmitARCCopyWeak(llvm::Value *dst, llvm::Value *src) { llvm::Value *CodeGenFunction::EmitObjCAutoreleasePoolPush() { llvm::Constant *&fn = CGM.getRREntrypoints().objc_autoreleasePoolPush; if (!fn) { - const llvm::FunctionType *fnType = + llvm::FunctionType *fnType = llvm::FunctionType::get(Int8PtrTy, false); fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPush"); } @@ -1728,7 +1994,7 @@ void CodeGenFunction::EmitObjCAutoreleasePoolPop(llvm::Value *value) { llvm::Constant *&fn = CGM.getRREntrypoints().objc_autoreleasePoolPop; if (!fn) { std::vector<llvm::Type*> args(1, Int8PtrTy); - const llvm::FunctionType *fnType = + llvm::FunctionType *fnType = llvm::FunctionType::get(Builder.getVoidTy(), args, false); // We don't want to use a weak import here; instead we should not @@ -1851,6 +2117,24 @@ static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF, e = e->IgnoreParens(); QualType type = e->getType(); + // If we're loading retained from a __strong xvalue, we can avoid + // an extra retain/release pair by zeroing out the source of this + // "move" operation. + if (e->isXValue() && + !type.isConstQualified() && + type.getObjCLifetime() == Qualifiers::OCL_Strong) { + // Emit the lvalue. + LValue lv = CGF.EmitLValue(e); + + // Load the object pointer. + llvm::Value *result = CGF.EmitLoadOfLValue(lv).getScalarVal(); + + // Set the source pointer to NULL. + CGF.EmitStoreOfScalar(getNullForVariable(lv.getAddress()), lv); + + return TryEmitResult(result, true); + } + // As a very special optimization, in ARC++, if the l-value is the // result of a non-volatile assignment, do a simple retain of the // result of the call to objc_storeWeak instead of reloading. @@ -1913,35 +2197,53 @@ static llvm::Value *emitARCRetainAfterCall(CodeGenFunction &CGF, } } +/// Determine whether it might be important to emit a separate +/// objc_retain_block on the result of the given expression, or +/// whether it's okay to just emit it in a +1 context. +static bool shouldEmitSeparateBlockRetain(const Expr *e) { + assert(e->getType()->isBlockPointerType()); + e = e->IgnoreParens(); + + // For future goodness, emit block expressions directly in +1 + // contexts if we can. + if (isa<BlockExpr>(e)) + return false; + + if (const CastExpr *cast = dyn_cast<CastExpr>(e)) { + switch (cast->getCastKind()) { + // Emitting these operations in +1 contexts is goodness. + case CK_LValueToRValue: + case CK_ARCReclaimReturnedObject: + case CK_ARCConsumeObject: + case CK_ARCProduceObject: + return false; + + // These operations preserve a block type. + case CK_NoOp: + case CK_BitCast: + return shouldEmitSeparateBlockRetain(cast->getSubExpr()); + + // These operations are known to be bad (or haven't been considered). + case CK_AnyPointerToBlockPointerCast: + default: + return true; + } + } + + return true; +} + static TryEmitResult tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) { + // Look through cleanups. + if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) { + CodeGenFunction::RunCleanupsScope scope(CGF); + return tryEmitARCRetainScalarExpr(CGF, cleanups->getSubExpr()); + } + // The desired result type, if it differs from the type of the // ultimate opaque expression. - const llvm::Type *resultType = 0; - - // If we're loading retained from a __strong xvalue, we can avoid - // an extra retain/release pair by zeroing out the source of this - // "move" operation. - if (e->isXValue() && !e->getType().isConstQualified() && - e->getType().getObjCLifetime() == Qualifiers::OCL_Strong) { - // Emit the lvalue - LValue lv = CGF.EmitLValue(e); - - // Load the object pointer and cast it to the appropriate type. - QualType exprType = e->getType(); - llvm::Value *result = CGF.EmitLoadOfLValue(lv).getScalarVal(); - - if (resultType) - result = CGF.Builder.CreateBitCast(result, resultType); - - // Set the source pointer to NULL. - llvm::Value *null - = llvm::ConstantPointerNull::get( - cast<llvm::PointerType>(CGF.ConvertType(exprType))); - CGF.EmitStoreOfScalar(null, lv); - - return TryEmitResult(result, true); - } + llvm::Type *resultType = 0; while (true) { e = e->IgnoreParens(); @@ -1969,7 +2271,8 @@ tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) { // These casts can change the type, so remember that and // soldier on. We only need to remember the outermost such // cast, though. - case CK_AnyPointerToObjCPointerCast: + case CK_CPointerToObjCPointerCast: + case CK_BlockPointerToObjCPointerCast: case CK_AnyPointerToBlockPointerCast: case CK_BitCast: if (!resultType) @@ -1980,15 +2283,49 @@ tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) { // For consumptions, just emit the subexpression and thus elide // the retain/release pair. - case CK_ObjCConsumeObject: { + case CK_ARCConsumeObject: { llvm::Value *result = CGF.EmitScalarExpr(ce->getSubExpr()); if (resultType) result = CGF.Builder.CreateBitCast(result, resultType); return TryEmitResult(result, true); } + // Block extends are net +0. Naively, we could just recurse on + // the subexpression, but actually we need to ensure that the + // value is copied as a block, so there's a little filter here. + case CK_ARCExtendBlockObject: { + llvm::Value *result; // will be a +0 value + + // If we can't safely assume the sub-expression will produce a + // block-copied value, emit the sub-expression at +0. + if (shouldEmitSeparateBlockRetain(ce->getSubExpr())) { + result = CGF.EmitScalarExpr(ce->getSubExpr()); + + // Otherwise, try to emit the sub-expression at +1 recursively. + } else { + TryEmitResult subresult + = tryEmitARCRetainScalarExpr(CGF, ce->getSubExpr()); + result = subresult.getPointer(); + + // If that produced a retained value, just use that, + // possibly casting down. + if (subresult.getInt()) { + if (resultType) + result = CGF.Builder.CreateBitCast(result, resultType); + return TryEmitResult(result, true); + } + + // Otherwise it's +0. + } + + // Retain the object as a block, then cast down. + result = CGF.EmitARCRetainBlock(result, /*mandatory*/ true); + if (resultType) result = CGF.Builder.CreateBitCast(result, resultType); + return TryEmitResult(result, true); + } + // For reclaims, emit the subexpression as a retained call and // skip the consumption. - case CK_ObjCReclaimReturnedObject: { + case CK_ARCReclaimReturnedObject: { llvm::Value *result = emitARCRetainCall(CGF, ce->getSubExpr()); if (resultType) result = CGF.Builder.CreateBitCast(result, resultType); return TryEmitResult(result, true); @@ -2067,6 +2404,48 @@ CodeGenFunction::EmitARCRetainAutoreleaseScalarExpr(const Expr *e) { return value; } +llvm::Value *CodeGenFunction::EmitARCExtendBlockObject(const Expr *e) { + llvm::Value *result; + bool doRetain; + + if (shouldEmitSeparateBlockRetain(e)) { + result = EmitScalarExpr(e); + doRetain = true; + } else { + TryEmitResult subresult = tryEmitARCRetainScalarExpr(*this, e); + result = subresult.getPointer(); + doRetain = !subresult.getInt(); + } + + if (doRetain) + result = EmitARCRetainBlock(result, /*mandatory*/ true); + return EmitObjCConsumeObject(e->getType(), result); +} + +llvm::Value *CodeGenFunction::EmitObjCThrowOperand(const Expr *expr) { + // In ARC, retain and autorelease the expression. + if (getLangOptions().ObjCAutoRefCount) { + // Do so before running any cleanups for the full-expression. + // tryEmitARCRetainScalarExpr does make an effort to do things + // inside cleanups, but there are crazy cases like + // @throw A().foo; + // where a full retain+autorelease is required and would + // otherwise happen after the destructor for the temporary. + CodeGenFunction::RunCleanupsScope cleanups(*this); + if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(expr)) + expr = ewc->getSubExpr(); + + return EmitARCRetainAutoreleaseScalarExpr(expr); + } + + // Otherwise, use the normal scalar-expression emission. The + // exception machinery doesn't do anything special with the + // exception like retaining it, so there's no safety associated with + // only running cleanups after the throw has started, and when it + // matters it tends to be substantially inferior code. + return EmitScalarExpr(expr); +} + std::pair<LValue,llvm::Value*> CodeGenFunction::EmitARCStoreStrong(const BinaryOperator *e, bool ignored) { @@ -2074,10 +2453,20 @@ CodeGenFunction::EmitARCStoreStrong(const BinaryOperator *e, TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e->getRHS()); llvm::Value *value = result.getPointer(); + bool hasImmediateRetain = result.getInt(); + + // If we didn't emit a retained object, and the l-value is of block + // type, then we need to emit the block-retain immediately in case + // it invalidates the l-value. + if (!hasImmediateRetain && e->getType()->isBlockPointerType()) { + value = EmitARCRetainBlock(value, /*mandatory*/ false); + hasImmediateRetain = true; + } + LValue lvalue = EmitLValue(e->getLHS()); // If the RHS was emitted retained, expand this. - if (result.getInt()) { + if (hasImmediateRetain) { llvm::Value *oldValue = EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatileQualified(), lvalue.getAlignment(), e->getType(), @@ -2111,10 +2500,8 @@ void CodeGenFunction::EmitObjCAutoreleasePoolStmt( const CompoundStmt &S = cast<CompoundStmt>(*subStmt); CGDebugInfo *DI = getDebugInfo(); - if (DI) { - DI->setLocation(S.getLBracLoc()); - DI->EmitRegionStart(Builder); - } + if (DI) + DI->EmitLexicalBlockStart(Builder, S.getLBracLoc()); // Keep track of the current cleanup stack depth. RunCleanupsScope Scope(*this); @@ -2130,19 +2517,16 @@ void CodeGenFunction::EmitObjCAutoreleasePoolStmt( E = S.body_end(); I != E; ++I) EmitStmt(*I); - if (DI) { - DI->setLocation(S.getRBracLoc()); - DI->EmitRegionEnd(Builder); - } + if (DI) + DI->EmitLexicalBlockEnd(Builder, S.getRBracLoc()); } /// EmitExtendGCLifetime - Given a pointer to an Objective-C object, /// make sure it survives garbage collection until this point. void CodeGenFunction::EmitExtendGCLifetime(llvm::Value *object) { // We just use an inline assembly. - llvm::Type *paramTypes[] = { VoidPtrTy }; llvm::FunctionType *extenderType - = llvm::FunctionType::get(VoidTy, paramTypes, /*variadic*/ false); + = llvm::FunctionType::get(VoidTy, VoidPtrTy, /*variadic*/ false); llvm::Value *extender = llvm::InlineAsm::get(extenderType, /* assembly */ "", |
