forked from OSchip/llvm-project
3068 lines
116 KiB
C++
3068 lines
116 KiB
C++
//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Objective-C code as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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#include "CGDebugInfo.h"
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#include "CGObjCRuntime.h"
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "TargetInfo.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/StmtObjC.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/CodeGen/CGFunctionInfo.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/InlineAsm.h"
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#include "llvm/Support/CallSite.h"
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using namespace clang;
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using namespace CodeGen;
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typedef llvm::PointerIntPair<llvm::Value*,1,bool> TryEmitResult;
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static TryEmitResult
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tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e);
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static RValue AdjustRelatedResultType(CodeGenFunction &CGF,
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QualType ET,
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const ObjCMethodDecl *Method,
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RValue Result);
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/// Given the address of a variable of pointer type, find the correct
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/// null to store into it.
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static llvm::Constant *getNullForVariable(llvm::Value *addr) {
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llvm::Type *type =
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cast<llvm::PointerType>(addr->getType())->getElementType();
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return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(type));
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}
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/// Emits an instance of NSConstantString representing the object.
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llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E)
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{
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llvm::Constant *C =
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CGM.getObjCRuntime().GenerateConstantString(E->getString());
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// FIXME: This bitcast should just be made an invariant on the Runtime.
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return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
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}
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/// EmitObjCBoxedExpr - This routine generates code to call
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/// the appropriate expression boxing method. This will either be
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/// one of +[NSNumber numberWith<Type>:], or +[NSString stringWithUTF8String:].
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///
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llvm::Value *
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CodeGenFunction::EmitObjCBoxedExpr(const ObjCBoxedExpr *E) {
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// Generate the correct selector for this literal's concrete type.
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const Expr *SubExpr = E->getSubExpr();
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// Get the method.
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const ObjCMethodDecl *BoxingMethod = E->getBoxingMethod();
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assert(BoxingMethod && "BoxingMethod is null");
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assert(BoxingMethod->isClassMethod() && "BoxingMethod must be a class method");
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Selector Sel = BoxingMethod->getSelector();
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// Generate a reference to the class pointer, which will be the receiver.
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// Assumes that the method was introduced in the class that should be
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// messaged (avoids pulling it out of the result type).
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CGObjCRuntime &Runtime = CGM.getObjCRuntime();
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const ObjCInterfaceDecl *ClassDecl = BoxingMethod->getClassInterface();
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llvm::Value *Receiver = Runtime.GetClass(*this, ClassDecl);
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const ParmVarDecl *argDecl = *BoxingMethod->param_begin();
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QualType ArgQT = argDecl->getType().getUnqualifiedType();
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RValue RV = EmitAnyExpr(SubExpr);
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CallArgList Args;
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Args.add(RV, ArgQT);
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RValue result = Runtime.GenerateMessageSend(
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*this, ReturnValueSlot(), BoxingMethod->getReturnType(), Sel, Receiver,
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Args, ClassDecl, BoxingMethod);
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return Builder.CreateBitCast(result.getScalarVal(),
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ConvertType(E->getType()));
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}
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llvm::Value *CodeGenFunction::EmitObjCCollectionLiteral(const Expr *E,
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const ObjCMethodDecl *MethodWithObjects) {
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ASTContext &Context = CGM.getContext();
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const ObjCDictionaryLiteral *DLE = 0;
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const ObjCArrayLiteral *ALE = dyn_cast<ObjCArrayLiteral>(E);
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if (!ALE)
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DLE = cast<ObjCDictionaryLiteral>(E);
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// Compute the type of the array we're initializing.
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uint64_t NumElements =
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ALE ? ALE->getNumElements() : DLE->getNumElements();
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llvm::APInt APNumElements(Context.getTypeSize(Context.getSizeType()),
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NumElements);
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QualType ElementType = Context.getObjCIdType().withConst();
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QualType ElementArrayType
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= Context.getConstantArrayType(ElementType, APNumElements,
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ArrayType::Normal, /*IndexTypeQuals=*/0);
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// Allocate the temporary array(s).
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llvm::Value *Objects = CreateMemTemp(ElementArrayType, "objects");
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llvm::Value *Keys = 0;
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if (DLE)
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Keys = CreateMemTemp(ElementArrayType, "keys");
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// In ARC, we may need to do extra work to keep all the keys and
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// values alive until after the call.
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SmallVector<llvm::Value *, 16> NeededObjects;
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bool TrackNeededObjects =
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(getLangOpts().ObjCAutoRefCount &&
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CGM.getCodeGenOpts().OptimizationLevel != 0);
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// Perform the actual initialialization of the array(s).
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for (uint64_t i = 0; i < NumElements; i++) {
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if (ALE) {
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// Emit the element and store it to the appropriate array slot.
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const Expr *Rhs = ALE->getElement(i);
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LValue LV = LValue::MakeAddr(Builder.CreateStructGEP(Objects, i),
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ElementType,
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Context.getTypeAlignInChars(Rhs->getType()),
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Context);
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llvm::Value *value = EmitScalarExpr(Rhs);
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EmitStoreThroughLValue(RValue::get(value), LV, true);
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if (TrackNeededObjects) {
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NeededObjects.push_back(value);
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}
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} else {
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// Emit the key and store it to the appropriate array slot.
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const Expr *Key = DLE->getKeyValueElement(i).Key;
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LValue KeyLV = LValue::MakeAddr(Builder.CreateStructGEP(Keys, i),
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ElementType,
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Context.getTypeAlignInChars(Key->getType()),
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Context);
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llvm::Value *keyValue = EmitScalarExpr(Key);
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EmitStoreThroughLValue(RValue::get(keyValue), KeyLV, /*isInit=*/true);
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// Emit the value and store it to the appropriate array slot.
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const Expr *Value = DLE->getKeyValueElement(i).Value;
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LValue ValueLV = LValue::MakeAddr(Builder.CreateStructGEP(Objects, i),
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ElementType,
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Context.getTypeAlignInChars(Value->getType()),
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Context);
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llvm::Value *valueValue = EmitScalarExpr(Value);
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EmitStoreThroughLValue(RValue::get(valueValue), ValueLV, /*isInit=*/true);
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if (TrackNeededObjects) {
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NeededObjects.push_back(keyValue);
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NeededObjects.push_back(valueValue);
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}
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}
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}
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// Generate the argument list.
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CallArgList Args;
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ObjCMethodDecl::param_const_iterator PI = MethodWithObjects->param_begin();
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const ParmVarDecl *argDecl = *PI++;
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QualType ArgQT = argDecl->getType().getUnqualifiedType();
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Args.add(RValue::get(Objects), ArgQT);
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if (DLE) {
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argDecl = *PI++;
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ArgQT = argDecl->getType().getUnqualifiedType();
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Args.add(RValue::get(Keys), ArgQT);
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}
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argDecl = *PI;
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ArgQT = argDecl->getType().getUnqualifiedType();
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llvm::Value *Count =
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llvm::ConstantInt::get(CGM.getTypes().ConvertType(ArgQT), NumElements);
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Args.add(RValue::get(Count), ArgQT);
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// Generate a reference to the class pointer, which will be the receiver.
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Selector Sel = MethodWithObjects->getSelector();
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QualType ResultType = E->getType();
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const ObjCObjectPointerType *InterfacePointerType
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= ResultType->getAsObjCInterfacePointerType();
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ObjCInterfaceDecl *Class
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= InterfacePointerType->getObjectType()->getInterface();
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CGObjCRuntime &Runtime = CGM.getObjCRuntime();
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llvm::Value *Receiver = Runtime.GetClass(*this, Class);
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// Generate the message send.
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RValue result = Runtime.GenerateMessageSend(
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*this, ReturnValueSlot(), MethodWithObjects->getReturnType(), Sel,
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Receiver, Args, Class, MethodWithObjects);
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// The above message send needs these objects, but in ARC they are
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// passed in a buffer that is essentially __unsafe_unretained.
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// Therefore we must prevent the optimizer from releasing them until
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// after the call.
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if (TrackNeededObjects) {
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EmitARCIntrinsicUse(NeededObjects);
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}
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return Builder.CreateBitCast(result.getScalarVal(),
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ConvertType(E->getType()));
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}
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llvm::Value *CodeGenFunction::EmitObjCArrayLiteral(const ObjCArrayLiteral *E) {
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return EmitObjCCollectionLiteral(E, E->getArrayWithObjectsMethod());
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}
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llvm::Value *CodeGenFunction::EmitObjCDictionaryLiteral(
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const ObjCDictionaryLiteral *E) {
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return EmitObjCCollectionLiteral(E, E->getDictWithObjectsMethod());
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}
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/// Emit a selector.
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llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) {
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// Untyped selector.
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// Note that this implementation allows for non-constant strings to be passed
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// as arguments to @selector(). Currently, the only thing preventing this
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// behaviour is the type checking in the front end.
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return CGM.getObjCRuntime().GetSelector(*this, E->getSelector());
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}
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llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) {
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// FIXME: This should pass the Decl not the name.
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return CGM.getObjCRuntime().GenerateProtocolRef(*this, E->getProtocol());
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}
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/// \brief Adjust the type of the result of an Objective-C message send
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/// expression when the method has a related result type.
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static RValue AdjustRelatedResultType(CodeGenFunction &CGF,
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QualType ExpT,
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const ObjCMethodDecl *Method,
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RValue Result) {
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if (!Method)
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return Result;
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if (!Method->hasRelatedResultType() ||
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CGF.getContext().hasSameType(ExpT, Method->getReturnType()) ||
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!Result.isScalar())
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return Result;
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// We have applied a related result type. Cast the rvalue appropriately.
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return RValue::get(CGF.Builder.CreateBitCast(Result.getScalarVal(),
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CGF.ConvertType(ExpT)));
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}
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/// Decide whether to extend the lifetime of the receiver of a
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/// returns-inner-pointer message.
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static bool
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shouldExtendReceiverForInnerPointerMessage(const ObjCMessageExpr *message) {
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switch (message->getReceiverKind()) {
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// For a normal instance message, we should extend unless the
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// receiver is loaded from a variable with precise lifetime.
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case ObjCMessageExpr::Instance: {
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const Expr *receiver = message->getInstanceReceiver();
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const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(receiver);
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if (!ice || ice->getCastKind() != CK_LValueToRValue) return true;
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receiver = ice->getSubExpr()->IgnoreParens();
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// Only __strong variables.
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if (receiver->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
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return true;
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// All ivars and fields have precise lifetime.
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if (isa<MemberExpr>(receiver) || isa<ObjCIvarRefExpr>(receiver))
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return false;
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// Otherwise, check for variables.
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const DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(ice->getSubExpr());
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if (!declRef) return true;
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const VarDecl *var = dyn_cast<VarDecl>(declRef->getDecl());
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if (!var) return true;
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// All variables have precise lifetime except local variables with
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// automatic storage duration that aren't specially marked.
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return (var->hasLocalStorage() &&
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!var->hasAttr<ObjCPreciseLifetimeAttr>());
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}
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case ObjCMessageExpr::Class:
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case ObjCMessageExpr::SuperClass:
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// It's never necessary for class objects.
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return false;
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case ObjCMessageExpr::SuperInstance:
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// We generally assume that 'self' lives throughout a method call.
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return false;
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}
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llvm_unreachable("invalid receiver kind");
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}
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RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E,
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ReturnValueSlot Return) {
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// Only the lookup mechanism and first two arguments of the method
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// implementation vary between runtimes. We can get the receiver and
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// arguments in generic code.
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bool isDelegateInit = E->isDelegateInitCall();
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const ObjCMethodDecl *method = E->getMethodDecl();
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// We don't retain the receiver in delegate init calls, and this is
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// safe because the receiver value is always loaded from 'self',
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// which we zero out. We don't want to Block_copy block receivers,
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// though.
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bool retainSelf =
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(!isDelegateInit &&
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CGM.getLangOpts().ObjCAutoRefCount &&
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method &&
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method->hasAttr<NSConsumesSelfAttr>());
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CGObjCRuntime &Runtime = CGM.getObjCRuntime();
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bool isSuperMessage = false;
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bool isClassMessage = false;
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ObjCInterfaceDecl *OID = 0;
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// Find the receiver
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QualType ReceiverType;
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llvm::Value *Receiver = 0;
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switch (E->getReceiverKind()) {
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case ObjCMessageExpr::Instance:
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ReceiverType = E->getInstanceReceiver()->getType();
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if (retainSelf) {
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TryEmitResult ter = tryEmitARCRetainScalarExpr(*this,
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E->getInstanceReceiver());
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Receiver = ter.getPointer();
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if (ter.getInt()) retainSelf = false;
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} else
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Receiver = EmitScalarExpr(E->getInstanceReceiver());
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break;
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case ObjCMessageExpr::Class: {
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ReceiverType = E->getClassReceiver();
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const ObjCObjectType *ObjTy = ReceiverType->getAs<ObjCObjectType>();
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assert(ObjTy && "Invalid Objective-C class message send");
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OID = ObjTy->getInterface();
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assert(OID && "Invalid Objective-C class message send");
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Receiver = Runtime.GetClass(*this, OID);
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isClassMessage = true;
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break;
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}
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case ObjCMessageExpr::SuperInstance:
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ReceiverType = E->getSuperType();
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Receiver = LoadObjCSelf();
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isSuperMessage = true;
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break;
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case ObjCMessageExpr::SuperClass:
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ReceiverType = E->getSuperType();
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Receiver = LoadObjCSelf();
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isSuperMessage = true;
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isClassMessage = true;
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break;
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}
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if (retainSelf)
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Receiver = EmitARCRetainNonBlock(Receiver);
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// In ARC, we sometimes want to "extend the lifetime"
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// (i.e. retain+autorelease) of receivers of returns-inner-pointer
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// messages.
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if (getLangOpts().ObjCAutoRefCount && method &&
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method->hasAttr<ObjCReturnsInnerPointerAttr>() &&
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shouldExtendReceiverForInnerPointerMessage(E))
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Receiver = EmitARCRetainAutorelease(ReceiverType, Receiver);
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QualType ResultType = method ? method->getReturnType() : E->getType();
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CallArgList Args;
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EmitCallArgs(Args, method, E->arg_begin(), E->arg_end());
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// For delegate init calls in ARC, do an unsafe store of null into
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// self. This represents the call taking direct ownership of that
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// value. We have to do this after emitting the other call
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// arguments because they might also reference self, but we don't
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// have to worry about any of them modifying self because that would
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// be an undefined read and write of an object in unordered
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// expressions.
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if (isDelegateInit) {
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assert(getLangOpts().ObjCAutoRefCount &&
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"delegate init calls should only be marked in ARC");
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// Do an unsafe store of null into self.
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llvm::Value *selfAddr =
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LocalDeclMap[cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl()];
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assert(selfAddr && "no self entry for a delegate init call?");
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Builder.CreateStore(getNullForVariable(selfAddr), selfAddr);
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}
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RValue result;
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if (isSuperMessage) {
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// super is only valid in an Objective-C method
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const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
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bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext());
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result = Runtime.GenerateMessageSendSuper(*this, Return, ResultType,
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E->getSelector(),
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OMD->getClassInterface(),
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isCategoryImpl,
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Receiver,
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isClassMessage,
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Args,
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method);
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} else {
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result = Runtime.GenerateMessageSend(*this, Return, ResultType,
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E->getSelector(),
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Receiver, Args, OID,
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method);
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}
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// For delegate init calls in ARC, implicitly store the result of
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// the call back into self. This takes ownership of the value.
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if (isDelegateInit) {
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llvm::Value *selfAddr =
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LocalDeclMap[cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl()];
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llvm::Value *newSelf = result.getScalarVal();
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// The delegate return type isn't necessarily a matching type; in
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// fact, it's quite likely to be 'id'.
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llvm::Type *selfTy =
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cast<llvm::PointerType>(selfAddr->getType())->getElementType();
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newSelf = Builder.CreateBitCast(newSelf, selfTy);
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Builder.CreateStore(newSelf, selfAddr);
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}
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return AdjustRelatedResultType(*this, E->getType(), method, result);
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}
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namespace {
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struct FinishARCDealloc : EHScopeStack::Cleanup {
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void Emit(CodeGenFunction &CGF, Flags flags) {
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const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CGF.CurCodeDecl);
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const ObjCImplDecl *impl = cast<ObjCImplDecl>(method->getDeclContext());
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const ObjCInterfaceDecl *iface = impl->getClassInterface();
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if (!iface->getSuperClass()) return;
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bool isCategory = isa<ObjCCategoryImplDecl>(impl);
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// Call [super dealloc] if we have a superclass.
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llvm::Value *self = CGF.LoadObjCSelf();
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CallArgList args;
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CGF.CGM.getObjCRuntime().GenerateMessageSendSuper(CGF, ReturnValueSlot(),
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CGF.getContext().VoidTy,
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method->getSelector(),
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iface,
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isCategory,
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self,
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/*is class msg*/ false,
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args,
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method);
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}
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};
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}
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/// StartObjCMethod - Begin emission of an ObjCMethod. This generates
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/// the LLVM function and sets the other context used by
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/// CodeGenFunction.
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void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD,
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const ObjCContainerDecl *CD,
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SourceLocation StartLoc) {
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FunctionArgList args;
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// Check if we should generate debug info for this method.
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if (OMD->hasAttr<NoDebugAttr>())
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DebugInfo = NULL; // disable debug info indefinitely for this function
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llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD);
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const CGFunctionInfo &FI = CGM.getTypes().arrangeObjCMethodDeclaration(OMD);
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CGM.SetInternalFunctionAttributes(OMD, Fn, FI);
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args.push_back(OMD->getSelfDecl());
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args.push_back(OMD->getCmdDecl());
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for (ObjCMethodDecl::param_const_iterator PI = OMD->param_begin(),
|
|
E = OMD->param_end(); PI != E; ++PI)
|
|
args.push_back(*PI);
|
|
|
|
CurGD = OMD;
|
|
|
|
StartFunction(OMD, OMD->getReturnType(), Fn, FI, args, StartLoc);
|
|
|
|
// In ARC, certain methods get an extra cleanup.
|
|
if (CGM.getLangOpts().ObjCAutoRefCount &&
|
|
OMD->isInstanceMethod() &&
|
|
OMD->getSelector().isUnarySelector()) {
|
|
const IdentifierInfo *ident =
|
|
OMD->getSelector().getIdentifierInfoForSlot(0);
|
|
if (ident->isStr("dealloc"))
|
|
EHStack.pushCleanup<FinishARCDealloc>(getARCCleanupKind());
|
|
}
|
|
}
|
|
|
|
static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF,
|
|
LValue lvalue, QualType type);
|
|
|
|
/// 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) {
|
|
StartObjCMethod(OMD, OMD->getClassInterface(), OMD->getLocStart());
|
|
assert(isa<CompoundStmt>(OMD->getBody()));
|
|
EmitCompoundStmtWithoutScope(*cast<CompoundStmt>(OMD->getBody()));
|
|
FinishFunction(OMD->getBodyRBrace());
|
|
}
|
|
|
|
/// 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().arrangeFreeFunctionCall(Context.VoidTy, args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
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 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.getLangOpts().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.getLangOpts().ObjCAutoRefCount && !IsAtomic) {
|
|
// Using standard expression emission for the setter is only
|
|
// acceptable if the ivar is __strong, which won't be true if
|
|
// the property is annotated with __attribute__((NSObject)).
|
|
// TODO: falling all the way back to objc_setProperty here is
|
|
// just laziness, though; we could still use objc_storeStrong
|
|
// if we hacked it right.
|
|
if (ivarType.getObjCLifetime() == Qualifiers::OCL_Strong)
|
|
Kind = Expression;
|
|
else
|
|
Kind = SetPropertyAndExpressionGet;
|
|
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.getLangOpts().getGC() &&
|
|
CGM.getContext().getObjCGCAttrKind(ivarType))) {
|
|
Kind = Expression;
|
|
return;
|
|
}
|
|
|
|
// Compute whether the ivar has strong members.
|
|
if (CGM.getLangOpts().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.getTarget().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;
|
|
}
|
|
|
|
/// \brief 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) {
|
|
llvm::Constant *AtomicHelperFn =
|
|
GenerateObjCAtomicGetterCopyHelperFunction(PID);
|
|
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
|
|
ObjCMethodDecl *OMD = PD->getGetterMethodDecl();
|
|
assert(OMD && "Invalid call to generate getter (empty method)");
|
|
StartObjCMethod(OMD, IMP->getClassInterface(), OMD->getLocStart());
|
|
|
|
generateObjCGetterBody(IMP, PID, OMD, AtomicHelperFn);
|
|
|
|
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;
|
|
}
|
|
|
|
/// emitCPPObjectAtomicGetterCall - Call the runtime function to
|
|
/// copy the ivar into the resturn slot.
|
|
static void emitCPPObjectAtomicGetterCall(CodeGenFunction &CGF,
|
|
llvm::Value *returnAddr,
|
|
ObjCIvarDecl *ivar,
|
|
llvm::Constant *AtomicHelperFn) {
|
|
// objc_copyCppObjectAtomic (&returnSlot, &CppObjectIvar,
|
|
// AtomicHelperFn);
|
|
CallArgList args;
|
|
|
|
// The 1st argument is the return Slot.
|
|
args.add(RValue::get(returnAddr), CGF.getContext().VoidPtrTy);
|
|
|
|
// The 2nd 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);
|
|
|
|
// Third argument is the helper function.
|
|
args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
|
|
|
|
llvm::Value *copyCppAtomicObjectFn =
|
|
CGF.CGM.getObjCRuntime().GetCppAtomicObjectGetFunction();
|
|
CGF.EmitCall(CGF.getTypes().arrangeFreeFunctionCall(CGF.getContext().VoidTy,
|
|
args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
copyCppAtomicObjectFn, ReturnValueSlot(), args);
|
|
}
|
|
|
|
void
|
|
CodeGenFunction::generateObjCGetterBody(const ObjCImplementationDecl *classImpl,
|
|
const ObjCPropertyImplDecl *propImpl,
|
|
const ObjCMethodDecl *GetterMethodDecl,
|
|
llvm::Constant *AtomicHelperFn) {
|
|
// If there's a non-trivial 'get' expression, we just have to emit that.
|
|
if (!hasTrivialGetExpr(propImpl)) {
|
|
if (!AtomicHelperFn) {
|
|
ReturnStmt ret(SourceLocation(), propImpl->getGetterCXXConstructor(),
|
|
/*nrvo*/ 0);
|
|
EmitReturnStmt(ret);
|
|
}
|
|
else {
|
|
ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
|
|
emitCPPObjectAtomicGetterCall(*this, ReturnValue,
|
|
ivar, AtomicHelperFn);
|
|
}
|
|
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: {
|
|
// We don't need to do anything for a zero-size struct.
|
|
if (strategy.getIvarSize().isZero())
|
|
return;
|
|
|
|
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.
|
|
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.
|
|
llvm::Instruction *CallInstruction;
|
|
RValue RV = EmitCall(getTypes().arrangeFreeFunctionCall(propType, args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
getPropertyFn, ReturnValueSlot(), args, 0,
|
|
&CallInstruction);
|
|
if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(CallInstruction))
|
|
call->setTailCall();
|
|
|
|
// 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(),
|
|
getTypes().ConvertType(getterMethod->getReturnType())));
|
|
|
|
EmitReturnOfRValue(RV, propType);
|
|
|
|
// objc_getProperty does an autorelease, so we should suppress ours.
|
|
AutoreleaseResult = false;
|
|
|
|
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();
|
|
switch (getEvaluationKind(ivarType)) {
|
|
case TEK_Complex: {
|
|
ComplexPairTy pair = EmitLoadOfComplex(LV, SourceLocation());
|
|
EmitStoreOfComplex(pair,
|
|
MakeNaturalAlignAddrLValue(ReturnValue, ivarType),
|
|
/*init*/ true);
|
|
return;
|
|
}
|
|
case TEK_Aggregate:
|
|
// 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);
|
|
return;
|
|
case TEK_Scalar: {
|
|
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 {
|
|
value = EmitLoadOfLValue(LV, SourceLocation()).getScalarVal();
|
|
AutoreleaseResult = false;
|
|
}
|
|
|
|
value = Builder.CreateBitCast(value, ConvertType(propType));
|
|
value = Builder.CreateBitCast(
|
|
value, ConvertType(GetterMethodDecl->getReturnType()));
|
|
}
|
|
|
|
EmitReturnOfRValue(RValue::get(value), propType);
|
|
return;
|
|
}
|
|
}
|
|
llvm_unreachable("bad evaluation kind");
|
|
}
|
|
|
|
}
|
|
llvm_unreachable("bad @property implementation strategy!");
|
|
}
|
|
|
|
/// 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);
|
|
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, false, argVar->getType().getNonReferenceType(),
|
|
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().arrangeFreeFunctionCall(CGF.getContext().VoidTy,
|
|
args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
copyStructFn, ReturnValueSlot(), args);
|
|
}
|
|
|
|
/// emitCPPObjectAtomicSetterCall - Call the runtime function to store
|
|
/// the value from the first formal parameter into the given ivar, using
|
|
/// the Cpp API for atomic Cpp objects with non-trivial copy assignment.
|
|
static void emitCPPObjectAtomicSetterCall(CodeGenFunction &CGF,
|
|
ObjCMethodDecl *OMD,
|
|
ObjCIvarDecl *ivar,
|
|
llvm::Constant *AtomicHelperFn) {
|
|
// objc_copyCppObjectAtomic (&CppObjectIvar, &Arg,
|
|
// AtomicHelperFn);
|
|
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, false, argVar->getType().getNonReferenceType(),
|
|
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);
|
|
|
|
// Third argument is the helper function.
|
|
args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
|
|
|
|
llvm::Value *copyCppAtomicObjectFn =
|
|
CGF.CGM.getObjCRuntime().GetCppAtomicObjectSetFunction();
|
|
CGF.EmitCall(CGF.getTypes().arrangeFreeFunctionCall(CGF.getContext().VoidTy,
|
|
args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
copyCppAtomicObjectFn, 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 UseOptimizedSetter(CodeGenModule &CGM) {
|
|
if (CGM.getLangOpts().getGC() != LangOptions::NonGC)
|
|
return false;
|
|
return CGM.getLangOpts().ObjCRuntime.hasOptimizedSetter();
|
|
}
|
|
|
|
void
|
|
CodeGenFunction::generateObjCSetterBody(const ObjCImplementationDecl *classImpl,
|
|
const ObjCPropertyImplDecl *propImpl,
|
|
llvm::Constant *AtomicHelperFn) {
|
|
const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
|
|
ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
|
|
ObjCMethodDecl *setterMethod = prop->getSetterMethodDecl();
|
|
|
|
// Just use the setter expression if Sema gave us one and it's
|
|
// non-trivial.
|
|
if (!hasTrivialSetExpr(propImpl)) {
|
|
if (!AtomicHelperFn)
|
|
// If non-atomic, assignment is called directly.
|
|
EmitStmt(propImpl->getSetterCXXAssignment());
|
|
else
|
|
// If atomic, assignment is called via a locking api.
|
|
emitCPPObjectAtomicSetterCall(*this, setterMethod, ivar,
|
|
AtomicHelperFn);
|
|
return;
|
|
}
|
|
|
|
PropertyImplStrategy strategy(CGM, propImpl);
|
|
switch (strategy.getKind()) {
|
|
case PropertyImplStrategy::Native: {
|
|
// We don't need to do anything for a zero-size struct.
|
|
if (strategy.getIvarSize().isZero())
|
|
return;
|
|
|
|
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 *setOptimizedPropertyFn = 0;
|
|
llvm::Value *setPropertyFn = 0;
|
|
if (UseOptimizedSetter(CGM)) {
|
|
// 10.8 and iOS 6.0 code and GC is off
|
|
setOptimizedPropertyFn =
|
|
CGM.getObjCRuntime()
|
|
.GetOptimizedPropertySetFunction(strategy.isAtomic(),
|
|
strategy.isCopy());
|
|
if (!setOptimizedPropertyFn) {
|
|
CGM.ErrorUnsupported(propImpl, "Obj-C optimized setter - NYI");
|
|
return;
|
|
}
|
|
}
|
|
else {
|
|
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());
|
|
if (setOptimizedPropertyFn) {
|
|
args.add(RValue::get(arg), getContext().getObjCIdType());
|
|
args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
|
|
EmitCall(getTypes().arrangeFreeFunctionCall(getContext().VoidTy, args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
setOptimizedPropertyFn, ReturnValueSlot(), args);
|
|
} else {
|
|
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().arrangeFreeFunctionCall(getContext().VoidTy, args,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
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, false, selfDecl->getType(),
|
|
VK_LValue, SourceLocation());
|
|
ImplicitCastExpr selfLoad(ImplicitCastExpr::OnStack,
|
|
selfDecl->getType(), CK_LValueToRValue, &self,
|
|
VK_RValue);
|
|
ObjCIvarRefExpr ivarRef(ivar, ivar->getType().getNonReferenceType(),
|
|
SourceLocation(), SourceLocation(),
|
|
&selfLoad, true, true);
|
|
|
|
ParmVarDecl *argDecl = *setterMethod->param_begin();
|
|
QualType argType = argDecl->getType().getNonReferenceType();
|
|
DeclRefExpr arg(argDecl, false, 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;
|
|
}
|
|
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(), false);
|
|
EmitStmt(&assign);
|
|
}
|
|
|
|
/// \brief Generate an Objective-C property setter function.
|
|
///
|
|
/// The given Decl must be an ObjCImplementationDecl. \@synthesize
|
|
/// is illegal within a category.
|
|
void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP,
|
|
const ObjCPropertyImplDecl *PID) {
|
|
llvm::Constant *AtomicHelperFn =
|
|
GenerateObjCAtomicSetterCopyHelperFunction(PID);
|
|
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
|
|
ObjCMethodDecl *OMD = PD->getSetterMethodDecl();
|
|
assert(OMD && "Invalid call to generate setter (empty method)");
|
|
StartObjCMethod(OMD, IMP->getClassInterface(), OMD->getLocStart());
|
|
|
|
generateObjCSetterBody(IMP, PID, AtomicHelperFn);
|
|
|
|
FinishFunction();
|
|
}
|
|
|
|
namespace {
|
|
struct DestroyIvar : EHScopeStack::Cleanup {
|
|
private:
|
|
llvm::Value *addr;
|
|
const ObjCIvarDecl *ivar;
|
|
CodeGenFunction::Destroyer *destroyer;
|
|
bool useEHCleanupForArray;
|
|
public:
|
|
DestroyIvar(llvm::Value *addr, const ObjCIvarDecl *ivar,
|
|
CodeGenFunction::Destroyer *destroyer,
|
|
bool useEHCleanupForArray)
|
|
: addr(addr), ivar(ivar), destroyer(destroyer),
|
|
useEHCleanupForArray(useEHCleanupForArray) {}
|
|
|
|
void Emit(CodeGenFunction &CGF, Flags flags) {
|
|
LValue lvalue
|
|
= CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), addr, ivar, /*CVR*/ 0);
|
|
CGF.emitDestroy(lvalue.getAddress(), ivar->getType(), destroyer,
|
|
flags.isForNormalCleanup() && useEHCleanupForArray);
|
|
}
|
|
};
|
|
}
|
|
|
|
/// Like CodeGenFunction::destroyARCStrong, but do it with a call.
|
|
static void destroyARCStrongWithStore(CodeGenFunction &CGF,
|
|
llvm::Value *addr,
|
|
QualType type) {
|
|
llvm::Value *null = getNullForVariable(addr);
|
|
CGF.EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
|
|
}
|
|
|
|
static void emitCXXDestructMethod(CodeGenFunction &CGF,
|
|
ObjCImplementationDecl *impl) {
|
|
CodeGenFunction::RunCleanupsScope scope(CGF);
|
|
|
|
llvm::Value *self = CGF.LoadObjCSelf();
|
|
|
|
const ObjCInterfaceDecl *iface = impl->getClassInterface();
|
|
for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
|
|
ivar; ivar = ivar->getNextIvar()) {
|
|
QualType type = ivar->getType();
|
|
|
|
// Check whether the ivar is a destructible type.
|
|
QualType::DestructionKind dtorKind = type.isDestructedType();
|
|
if (!dtorKind) continue;
|
|
|
|
CodeGenFunction::Destroyer *destroyer = 0;
|
|
|
|
// Use a call to objc_storeStrong to destroy strong ivars, for the
|
|
// general benefit of the tools.
|
|
if (dtorKind == QualType::DK_objc_strong_lifetime) {
|
|
destroyer = destroyARCStrongWithStore;
|
|
|
|
// Otherwise use the default for the destruction kind.
|
|
} else {
|
|
destroyer = CGF.getDestroyer(dtorKind);
|
|
}
|
|
|
|
CleanupKind cleanupKind = CGF.getCleanupKind(dtorKind);
|
|
|
|
CGF.EHStack.pushCleanup<DestroyIvar>(cleanupKind, self, ivar, destroyer,
|
|
cleanupKind & EHCleanup);
|
|
}
|
|
|
|
assert(scope.requiresCleanups() && "nothing to do in .cxx_destruct?");
|
|
}
|
|
|
|
void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP,
|
|
ObjCMethodDecl *MD,
|
|
bool ctor) {
|
|
MD->createImplicitParams(CGM.getContext(), IMP->getClassInterface());
|
|
StartObjCMethod(MD, IMP->getClassInterface(), MD->getLocStart());
|
|
|
|
// Emit .cxx_construct.
|
|
if (ctor) {
|
|
// Suppress the final autorelease in ARC.
|
|
AutoreleaseResult = false;
|
|
|
|
for (ObjCImplementationDecl::init_const_iterator B = IMP->init_begin(),
|
|
E = IMP->init_end(); B != E; ++B) {
|
|
CXXCtorInitializer *IvarInit = (*B);
|
|
FieldDecl *Field = IvarInit->getAnyMember();
|
|
ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field);
|
|
LValue LV = EmitLValueForIvar(TypeOfSelfObject(),
|
|
LoadObjCSelf(), Ivar, 0);
|
|
EmitAggExpr(IvarInit->getInit(),
|
|
AggValueSlot::forLValue(LV, AggValueSlot::IsDestructed,
|
|
AggValueSlot::DoesNotNeedGCBarriers,
|
|
AggValueSlot::IsNotAliased));
|
|
}
|
|
// constructor returns 'self'.
|
|
CodeGenTypes &Types = CGM.getTypes();
|
|
QualType IdTy(CGM.getContext().getObjCIdType());
|
|
llvm::Value *SelfAsId =
|
|
Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy));
|
|
EmitReturnOfRValue(RValue::get(SelfAsId), IdTy);
|
|
|
|
// Emit .cxx_destruct.
|
|
} else {
|
|
emitCXXDestructMethod(*this, IMP);
|
|
}
|
|
FinishFunction();
|
|
}
|
|
|
|
bool CodeGenFunction::IndirectObjCSetterArg(const CGFunctionInfo &FI) {
|
|
CGFunctionInfo::const_arg_iterator it = FI.arg_begin();
|
|
it++; it++;
|
|
const ABIArgInfo &AI = it->info;
|
|
// FIXME. Is this sufficient check?
|
|
return (AI.getKind() == ABIArgInfo::Indirect);
|
|
}
|
|
|
|
bool CodeGenFunction::IvarTypeWithAggrGCObjects(QualType Ty) {
|
|
if (CGM.getLangOpts().getGC() == LangOptions::NonGC)
|
|
return false;
|
|
if (const RecordType *FDTTy = Ty.getTypePtr()->getAs<RecordType>())
|
|
return FDTTy->getDecl()->hasObjectMember();
|
|
return false;
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::LoadObjCSelf() {
|
|
VarDecl *Self = cast<ObjCMethodDecl>(CurFuncDecl)->getSelfDecl();
|
|
DeclRefExpr DRE(Self, /*is enclosing local*/ (CurFuncDecl != CurCodeDecl),
|
|
Self->getType(), VK_LValue, SourceLocation());
|
|
return EmitLoadOfScalar(EmitDeclRefLValue(&DRE), SourceLocation());
|
|
}
|
|
|
|
QualType CodeGenFunction::TypeOfSelfObject() {
|
|
const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
|
|
ImplicitParamDecl *selfDecl = OMD->getSelfDecl();
|
|
const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>(
|
|
getContext().getCanonicalType(selfDecl->getType()));
|
|
return PTy->getPointeeType();
|
|
}
|
|
|
|
void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){
|
|
llvm::Constant *EnumerationMutationFn =
|
|
CGM.getObjCRuntime().EnumerationMutationFunction();
|
|
|
|
if (!EnumerationMutationFn) {
|
|
CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime");
|
|
return;
|
|
}
|
|
|
|
CGDebugInfo *DI = getDebugInfo();
|
|
if (DI)
|
|
DI->EmitLexicalBlockStart(Builder, S.getSourceRange().getBegin());
|
|
|
|
// The local variable comes into scope immediately.
|
|
AutoVarEmission variable = AutoVarEmission::invalid();
|
|
if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement()))
|
|
variable = EmitAutoVarAlloca(*cast<VarDecl>(SD->getSingleDecl()));
|
|
|
|
JumpDest LoopEnd = getJumpDestInCurrentScope("forcoll.end");
|
|
|
|
// Fast enumeration state.
|
|
QualType StateTy = CGM.getObjCFastEnumerationStateType();
|
|
llvm::Value *StatePtr = CreateMemTemp(StateTy, "state.ptr");
|
|
EmitNullInitialization(StatePtr, StateTy);
|
|
|
|
// Number of elements in the items array.
|
|
static const unsigned NumItems = 16;
|
|
|
|
// Fetch the countByEnumeratingWithState:objects:count: selector.
|
|
IdentifierInfo *II[] = {
|
|
&CGM.getContext().Idents.get("countByEnumeratingWithState"),
|
|
&CGM.getContext().Idents.get("objects"),
|
|
&CGM.getContext().Idents.get("count")
|
|
};
|
|
Selector FastEnumSel =
|
|
CGM.getContext().Selectors.getSelector(llvm::array_lengthof(II), &II[0]);
|
|
|
|
QualType ItemsTy =
|
|
getContext().getConstantArrayType(getContext().getObjCIdType(),
|
|
llvm::APInt(32, NumItems),
|
|
ArrayType::Normal, 0);
|
|
llvm::Value *ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr");
|
|
|
|
// Emit the collection pointer. In ARC, we do a retain.
|
|
llvm::Value *Collection;
|
|
if (getLangOpts().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;
|
|
|
|
// The first argument is a temporary of the enumeration-state type.
|
|
Args.add(RValue::get(StatePtr), getContext().getPointerType(StateTy));
|
|
|
|
// The second argument is a temporary array with space for NumItems
|
|
// pointers. We'll actually be loading elements from the array
|
|
// pointer written into the control state; this buffer is so that
|
|
// collections that *aren't* backed by arrays can still queue up
|
|
// batches of elements.
|
|
Args.add(RValue::get(ItemsPtr), getContext().getPointerType(ItemsTy));
|
|
|
|
// The third argument is the capacity of that temporary array.
|
|
llvm::Type *UnsignedLongLTy = ConvertType(getContext().UnsignedLongTy);
|
|
llvm::Constant *Count = llvm::ConstantInt::get(UnsignedLongLTy, NumItems);
|
|
Args.add(RValue::get(Count), getContext().UnsignedLongTy);
|
|
|
|
// Start the enumeration.
|
|
RValue CountRV =
|
|
CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
|
|
getContext().UnsignedLongTy,
|
|
FastEnumSel,
|
|
Collection, Args);
|
|
|
|
// The initial number of objects that were returned in the buffer.
|
|
llvm::Value *initialBufferLimit = CountRV.getScalarVal();
|
|
|
|
llvm::BasicBlock *EmptyBB = createBasicBlock("forcoll.empty");
|
|
llvm::BasicBlock *LoopInitBB = createBasicBlock("forcoll.loopinit");
|
|
|
|
llvm::Value *zero = llvm::Constant::getNullValue(UnsignedLongLTy);
|
|
|
|
// If the limit pointer was zero to begin with, the collection is
|
|
// empty; skip all this.
|
|
Builder.CreateCondBr(Builder.CreateICmpEQ(initialBufferLimit, zero, "iszero"),
|
|
EmptyBB, LoopInitBB);
|
|
|
|
// Otherwise, initialize the loop.
|
|
EmitBlock(LoopInitBB);
|
|
|
|
// Save the initial mutations value. This is the value at an
|
|
// address that was written into the state object by
|
|
// countByEnumeratingWithState:objects:count:.
|
|
llvm::Value *StateMutationsPtrPtr =
|
|
Builder.CreateStructGEP(StatePtr, 2, "mutationsptr.ptr");
|
|
llvm::Value *StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr,
|
|
"mutationsptr");
|
|
|
|
llvm::Value *initialMutations =
|
|
Builder.CreateLoad(StateMutationsPtr, "forcoll.initial-mutations");
|
|
|
|
RegionCounter Cnt = getPGORegionCounter(&S);
|
|
|
|
// Start looping. This is the point we return to whenever we have a
|
|
// fresh, non-empty batch of objects.
|
|
llvm::BasicBlock *LoopBodyBB = createBasicBlock("forcoll.loopbody");
|
|
EmitBlock(LoopBodyBB);
|
|
Cnt.beginRegion(Builder);
|
|
|
|
// The current index into the buffer.
|
|
llvm::PHINode *index = Builder.CreatePHI(UnsignedLongLTy, 3, "forcoll.index");
|
|
index->addIncoming(zero, LoopInitBB);
|
|
|
|
// The current buffer size.
|
|
llvm::PHINode *count = Builder.CreatePHI(UnsignedLongLTy, 3, "forcoll.count");
|
|
count->addIncoming(initialBufferLimit, LoopInitBB);
|
|
|
|
// Check whether the mutations value has changed from where it was
|
|
// at start. StateMutationsPtr should actually be invariant between
|
|
// refreshes.
|
|
StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr");
|
|
llvm::Value *currentMutations
|
|
= Builder.CreateLoad(StateMutationsPtr, "statemutations");
|
|
|
|
llvm::BasicBlock *WasMutatedBB = createBasicBlock("forcoll.mutated");
|
|
llvm::BasicBlock *WasNotMutatedBB = createBasicBlock("forcoll.notmutated");
|
|
|
|
Builder.CreateCondBr(Builder.CreateICmpEQ(currentMutations, initialMutations),
|
|
WasNotMutatedBB, WasMutatedBB);
|
|
|
|
// If so, call the enumeration-mutation function.
|
|
EmitBlock(WasMutatedBB);
|
|
llvm::Value *V =
|
|
Builder.CreateBitCast(Collection,
|
|
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
|
|
// should have computed it to build the function.
|
|
EmitCall(CGM.getTypes().arrangeFreeFunctionCall(getContext().VoidTy, Args2,
|
|
FunctionType::ExtInfo(),
|
|
RequiredArgs::All),
|
|
EnumerationMutationFn, ReturnValueSlot(), Args2);
|
|
|
|
// Otherwise, or if the mutation function returns, just continue.
|
|
EmitBlock(WasNotMutatedBB);
|
|
|
|
// Initialize the element variable.
|
|
RunCleanupsScope elementVariableScope(*this);
|
|
bool elementIsVariable;
|
|
LValue elementLValue;
|
|
QualType elementType;
|
|
if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) {
|
|
// Initialize the variable, in case it's a __block variable or something.
|
|
EmitAutoVarInit(variable);
|
|
|
|
const VarDecl* D = cast<VarDecl>(SD->getSingleDecl());
|
|
DeclRefExpr tempDRE(const_cast<VarDecl*>(D), false, D->getType(),
|
|
VK_LValue, SourceLocation());
|
|
elementLValue = EmitLValue(&tempDRE);
|
|
elementType = D->getType();
|
|
elementIsVariable = true;
|
|
|
|
if (D->isARCPseudoStrong())
|
|
elementLValue.getQuals().setObjCLifetime(Qualifiers::OCL_ExplicitNone);
|
|
} else {
|
|
elementLValue = LValue(); // suppress warning
|
|
elementType = cast<Expr>(S.getElement())->getType();
|
|
elementIsVariable = false;
|
|
}
|
|
llvm::Type *convertedElementType = ConvertType(elementType);
|
|
|
|
// Fetch the buffer out of the enumeration state.
|
|
// TODO: this pointer should actually be invariant between
|
|
// refreshes, which would help us do certain loop optimizations.
|
|
llvm::Value *StateItemsPtr =
|
|
Builder.CreateStructGEP(StatePtr, 1, "stateitems.ptr");
|
|
llvm::Value *EnumStateItems =
|
|
Builder.CreateLoad(StateItemsPtr, "stateitems");
|
|
|
|
// Fetch the value at the current index from the buffer.
|
|
llvm::Value *CurrentItemPtr =
|
|
Builder.CreateGEP(EnumStateItems, index, "currentitem.ptr");
|
|
llvm::Value *CurrentItem = Builder.CreateLoad(CurrentItemPtr);
|
|
|
|
// Cast that value to the right type.
|
|
CurrentItem = Builder.CreateBitCast(CurrentItem, convertedElementType,
|
|
"currentitem");
|
|
|
|
// Make sure we have an l-value. Yes, this gets evaluated every
|
|
// time through the loop.
|
|
if (!elementIsVariable) {
|
|
elementLValue = EmitLValue(cast<Expr>(S.getElement()));
|
|
EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue);
|
|
} else {
|
|
EmitScalarInit(CurrentItem, elementLValue);
|
|
}
|
|
|
|
// If we do have an element variable, this assignment is the end of
|
|
// its initialization.
|
|
if (elementIsVariable)
|
|
EmitAutoVarCleanups(variable);
|
|
|
|
// Perform the loop body, setting up break and continue labels.
|
|
BreakContinueStack.push_back(BreakContinue(LoopEnd, AfterBody));
|
|
{
|
|
RunCleanupsScope Scope(*this);
|
|
EmitStmt(S.getBody());
|
|
}
|
|
BreakContinueStack.pop_back();
|
|
|
|
// Destroy the element variable now.
|
|
elementVariableScope.ForceCleanup();
|
|
|
|
// Check whether there are more elements.
|
|
EmitBlock(AfterBody.getBlock());
|
|
|
|
llvm::BasicBlock *FetchMoreBB = createBasicBlock("forcoll.refetch");
|
|
|
|
// First we check in the local buffer.
|
|
llvm::Value *indexPlusOne
|
|
= Builder.CreateAdd(index, llvm::ConstantInt::get(UnsignedLongLTy, 1));
|
|
|
|
// TODO: We should probably model this as a "continue" for PGO
|
|
// If we haven't overrun the buffer yet, we can continue.
|
|
Builder.CreateCondBr(Builder.CreateICmpULT(indexPlusOne, count),
|
|
LoopBodyBB, FetchMoreBB);
|
|
|
|
index->addIncoming(indexPlusOne, AfterBody.getBlock());
|
|
count->addIncoming(count, AfterBody.getBlock());
|
|
|
|
// Otherwise, we have to fetch more elements.
|
|
EmitBlock(FetchMoreBB);
|
|
|
|
CountRV =
|
|
CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
|
|
getContext().UnsignedLongTy,
|
|
FastEnumSel,
|
|
Collection, Args);
|
|
|
|
// If we got a zero count, we're done.
|
|
llvm::Value *refetchCount = CountRV.getScalarVal();
|
|
|
|
// (note that the message send might split FetchMoreBB)
|
|
index->addIncoming(zero, Builder.GetInsertBlock());
|
|
count->addIncoming(refetchCount, Builder.GetInsertBlock());
|
|
|
|
// TODO: We should be applying PGO weights here, but this needs to handle the
|
|
// branch before FetchMoreBB or we risk getting the numbers wrong.
|
|
Builder.CreateCondBr(Builder.CreateICmpEQ(refetchCount, zero),
|
|
EmptyBB, LoopBodyBB);
|
|
|
|
// No more elements.
|
|
EmitBlock(EmptyBB);
|
|
|
|
if (!elementIsVariable) {
|
|
// If the element was not a declaration, set it to be null.
|
|
|
|
llvm::Value *null = llvm::Constant::getNullValue(convertedElementType);
|
|
elementLValue = EmitLValue(cast<Expr>(S.getElement()));
|
|
EmitStoreThroughLValue(RValue::get(null), elementLValue);
|
|
}
|
|
|
|
if (DI)
|
|
DI->EmitLexicalBlockEnd(Builder, S.getSourceRange().getEnd());
|
|
|
|
// Leave the cleanup we entered in ARC.
|
|
if (getLangOpts().ObjCAutoRefCount)
|
|
PopCleanupBlock();
|
|
|
|
EmitBlock(LoopEnd.getBlock());
|
|
// TODO: Once we calculate PGO weights above, set the region count here
|
|
}
|
|
|
|
void CodeGenFunction::EmitObjCAtTryStmt(const ObjCAtTryStmt &S) {
|
|
CGM.getObjCRuntime().EmitTryStmt(*this, S);
|
|
}
|
|
|
|
void CodeGenFunction::EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S) {
|
|
CGM.getObjCRuntime().EmitThrowStmt(*this, S);
|
|
}
|
|
|
|
void CodeGenFunction::EmitObjCAtSynchronizedStmt(
|
|
const ObjCAtSynchronizedStmt &S) {
|
|
CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S);
|
|
}
|
|
|
|
/// Produce the code for a CK_ARCProduceObject. Just does a
|
|
/// primitive retain.
|
|
llvm::Value *CodeGenFunction::EmitObjCProduceObject(QualType type,
|
|
llvm::Value *value) {
|
|
return EmitARCRetain(type, value);
|
|
}
|
|
|
|
namespace {
|
|
struct CallObjCRelease : EHScopeStack::Cleanup {
|
|
CallObjCRelease(llvm::Value *object) : object(object) {}
|
|
llvm::Value *object;
|
|
|
|
void Emit(CodeGenFunction &CGF, Flags flags) {
|
|
// Releases at the end of the full-expression are imprecise.
|
|
CGF.EmitARCRelease(object, ARCImpreciseLifetime);
|
|
}
|
|
};
|
|
}
|
|
|
|
/// 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.
|
|
pushFullExprCleanup<CallObjCRelease>(getARCCleanupKind(), object);
|
|
return object;
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitObjCExtendObjectLifetime(QualType type,
|
|
llvm::Value *value) {
|
|
return EmitARCRetainAutorelease(type, value);
|
|
}
|
|
|
|
/// Given a number of pointers, inform the optimizer that they're
|
|
/// being intrinsically used up until this point in the program.
|
|
void CodeGenFunction::EmitARCIntrinsicUse(ArrayRef<llvm::Value*> values) {
|
|
llvm::Constant *&fn = CGM.getARCEntrypoints().clang_arc_use;
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(CGM.VoidTy, ArrayRef<llvm::Type*>(), true);
|
|
fn = CGM.CreateRuntimeFunction(fnType, "clang.arc.use");
|
|
}
|
|
|
|
// This isn't really a "runtime" function, but as an intrinsic it
|
|
// doesn't really matter as long as we align things up.
|
|
EmitNounwindRuntimeCall(fn, values);
|
|
}
|
|
|
|
|
|
static llvm::Constant *createARCRuntimeFunction(CodeGenModule &CGM,
|
|
llvm::FunctionType *type,
|
|
StringRef fnName) {
|
|
llvm::Constant *fn = CGM.CreateRuntimeFunction(type, fnName);
|
|
|
|
if (llvm::Function *f = dyn_cast<llvm::Function>(fn)) {
|
|
// If the target runtime doesn't naturally support ARC, emit weak
|
|
// references to the runtime support library. We don't really
|
|
// permit this to fail, but we need a particular relocation style.
|
|
if (!CGM.getLangOpts().ObjCRuntime.hasNativeARC()) {
|
|
f->setLinkage(llvm::Function::ExternalWeakLinkage);
|
|
} else if (fnName == "objc_retain" || fnName == "objc_release") {
|
|
// If we have Native ARC, set nonlazybind attribute for these APIs for
|
|
// performance.
|
|
f->addFnAttr(llvm::Attribute::NonLazyBind);
|
|
}
|
|
}
|
|
|
|
return fn;
|
|
}
|
|
|
|
/// Perform an operation having the signature
|
|
/// i8* (i8*)
|
|
/// where a null input causes a no-op and returns null.
|
|
static llvm::Value *emitARCValueOperation(CodeGenFunction &CGF,
|
|
llvm::Value *value,
|
|
llvm::Constant *&fn,
|
|
StringRef fnName,
|
|
bool isTailCall = false) {
|
|
if (isa<llvm::ConstantPointerNull>(value)) return value;
|
|
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(CGF.Int8PtrTy, CGF.Int8PtrTy, false);
|
|
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
|
|
}
|
|
|
|
// Cast the argument to 'id'.
|
|
llvm::Type *origType = value->getType();
|
|
value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
|
|
|
|
// Call the function.
|
|
llvm::CallInst *call = CGF.EmitNounwindRuntimeCall(fn, value);
|
|
if (isTailCall)
|
|
call->setTailCall();
|
|
|
|
// Cast the result back to the original type.
|
|
return CGF.Builder.CreateBitCast(call, origType);
|
|
}
|
|
|
|
/// Perform an operation having the following signature:
|
|
/// i8* (i8**)
|
|
static llvm::Value *emitARCLoadOperation(CodeGenFunction &CGF,
|
|
llvm::Value *addr,
|
|
llvm::Constant *&fn,
|
|
StringRef fnName) {
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(CGF.Int8PtrTy, CGF.Int8PtrPtrTy, false);
|
|
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
|
|
}
|
|
|
|
// Cast the argument to 'id*'.
|
|
llvm::Type *origType = addr->getType();
|
|
addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
|
|
|
|
// Call the function.
|
|
llvm::Value *result = CGF.EmitNounwindRuntimeCall(fn, addr);
|
|
|
|
// Cast the result back to a dereference of the original type.
|
|
if (origType != CGF.Int8PtrPtrTy)
|
|
result = CGF.Builder.CreateBitCast(result,
|
|
cast<llvm::PointerType>(origType)->getElementType());
|
|
|
|
return result;
|
|
}
|
|
|
|
/// Perform an operation having the following signature:
|
|
/// i8* (i8**, i8*)
|
|
static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF,
|
|
llvm::Value *addr,
|
|
llvm::Value *value,
|
|
llvm::Constant *&fn,
|
|
StringRef fnName,
|
|
bool ignored) {
|
|
assert(cast<llvm::PointerType>(addr->getType())->getElementType()
|
|
== value->getType());
|
|
|
|
if (!fn) {
|
|
llvm::Type *argTypes[] = { CGF.Int8PtrPtrTy, CGF.Int8PtrTy };
|
|
|
|
llvm::FunctionType *fnType
|
|
= llvm::FunctionType::get(CGF.Int8PtrTy, argTypes, false);
|
|
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
|
|
}
|
|
|
|
llvm::Type *origType = value->getType();
|
|
|
|
llvm::Value *args[] = {
|
|
CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy),
|
|
CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy)
|
|
};
|
|
llvm::CallInst *result = CGF.EmitNounwindRuntimeCall(fn, args);
|
|
|
|
if (ignored) return 0;
|
|
|
|
return CGF.Builder.CreateBitCast(result, origType);
|
|
}
|
|
|
|
/// Perform an operation having the following signature:
|
|
/// void (i8**, i8**)
|
|
static void emitARCCopyOperation(CodeGenFunction &CGF,
|
|
llvm::Value *dst,
|
|
llvm::Value *src,
|
|
llvm::Constant *&fn,
|
|
StringRef fnName) {
|
|
assert(dst->getType() == src->getType());
|
|
|
|
if (!fn) {
|
|
llvm::Type *argTypes[] = { CGF.Int8PtrPtrTy, CGF.Int8PtrPtrTy };
|
|
|
|
llvm::FunctionType *fnType
|
|
= llvm::FunctionType::get(CGF.Builder.getVoidTy(), argTypes, false);
|
|
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
|
|
}
|
|
|
|
llvm::Value *args[] = {
|
|
CGF.Builder.CreateBitCast(dst, CGF.Int8PtrPtrTy),
|
|
CGF.Builder.CreateBitCast(src, CGF.Int8PtrPtrTy)
|
|
};
|
|
CGF.EmitNounwindRuntimeCall(fn, args);
|
|
}
|
|
|
|
/// Produce the code to do a retain. Based on the type, calls one of:
|
|
/// call i8* \@objc_retain(i8* %value)
|
|
/// call i8* \@objc_retainBlock(i8* %value)
|
|
llvm::Value *CodeGenFunction::EmitARCRetain(QualType type, llvm::Value *value) {
|
|
if (type->isBlockPointerType())
|
|
return EmitARCRetainBlock(value, /*mandatory*/ false);
|
|
else
|
|
return EmitARCRetainNonBlock(value);
|
|
}
|
|
|
|
/// Retain the given object, with normal retain semantics.
|
|
/// call i8* \@objc_retain(i8* %value)
|
|
llvm::Value *CodeGenFunction::EmitARCRetainNonBlock(llvm::Value *value) {
|
|
return emitARCValueOperation(*this, value,
|
|
CGM.getARCEntrypoints().objc_retain,
|
|
"objc_retain");
|
|
}
|
|
|
|
/// Retain the given block, with _Block_copy semantics.
|
|
/// call i8* \@objc_retainBlock(i8* %value)
|
|
///
|
|
/// \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.
|
|
/// call i8* \@objc_retainAutoreleasedReturnValue(i8* %value)
|
|
///
|
|
/// Yes, this function name is one character away from a different
|
|
/// call with completely different semantics.
|
|
llvm::Value *
|
|
CodeGenFunction::EmitARCRetainAutoreleasedReturnValue(llvm::Value *value) {
|
|
// Fetch the void(void) inline asm which marks that we're going to
|
|
// retain the autoreleased return value.
|
|
llvm::InlineAsm *&marker
|
|
= CGM.getARCEntrypoints().retainAutoreleasedReturnValueMarker;
|
|
if (!marker) {
|
|
StringRef assembly
|
|
= CGM.getTargetCodeGenInfo()
|
|
.getARCRetainAutoreleasedReturnValueMarker();
|
|
|
|
// If we have an empty assembly string, there's nothing to do.
|
|
if (assembly.empty()) {
|
|
|
|
// Otherwise, at -O0, build an inline asm that we're going to call
|
|
// in a moment.
|
|
} else if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
|
|
llvm::FunctionType *type =
|
|
llvm::FunctionType::get(VoidTy, /*variadic*/false);
|
|
|
|
marker = llvm::InlineAsm::get(type, assembly, "", /*sideeffects*/ true);
|
|
|
|
// If we're at -O1 and above, we don't want to litter the code
|
|
// with this marker yet, so leave a breadcrumb for the ARC
|
|
// optimizer to pick up.
|
|
} else {
|
|
llvm::NamedMDNode *metadata =
|
|
CGM.getModule().getOrInsertNamedMetadata(
|
|
"clang.arc.retainAutoreleasedReturnValueMarker");
|
|
assert(metadata->getNumOperands() <= 1);
|
|
if (metadata->getNumOperands() == 0) {
|
|
llvm::Value *string = llvm::MDString::get(getLLVMContext(), assembly);
|
|
metadata->addOperand(llvm::MDNode::get(getLLVMContext(), string));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Call the marker asm if we made one, which we do only at -O0.
|
|
if (marker) Builder.CreateCall(marker);
|
|
|
|
return emitARCValueOperation(*this, value,
|
|
CGM.getARCEntrypoints().objc_retainAutoreleasedReturnValue,
|
|
"objc_retainAutoreleasedReturnValue");
|
|
}
|
|
|
|
/// Release the given object.
|
|
/// call void \@objc_release(i8* %value)
|
|
void CodeGenFunction::EmitARCRelease(llvm::Value *value,
|
|
ARCPreciseLifetime_t precise) {
|
|
if (isa<llvm::ConstantPointerNull>(value)) return;
|
|
|
|
llvm::Constant *&fn = CGM.getARCEntrypoints().objc_release;
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
|
|
fn = createARCRuntimeFunction(CGM, fnType, "objc_release");
|
|
}
|
|
|
|
// Cast the argument to 'id'.
|
|
value = Builder.CreateBitCast(value, Int8PtrTy);
|
|
|
|
// Call objc_release.
|
|
llvm::CallInst *call = EmitNounwindRuntimeCall(fn, value);
|
|
|
|
if (precise == ARCImpreciseLifetime) {
|
|
SmallVector<llvm::Value*,1> args;
|
|
call->setMetadata("clang.imprecise_release",
|
|
llvm::MDNode::get(Builder.getContext(), args));
|
|
}
|
|
}
|
|
|
|
/// Destroy a __strong variable.
|
|
///
|
|
/// At -O0, emit a call to store 'null' into the address;
|
|
/// instrumenting tools prefer this because the address is exposed,
|
|
/// but it's relatively cumbersome to optimize.
|
|
///
|
|
/// At -O1 and above, just load and call objc_release.
|
|
///
|
|
/// call void \@objc_storeStrong(i8** %addr, i8* null)
|
|
void CodeGenFunction::EmitARCDestroyStrong(llvm::Value *addr,
|
|
ARCPreciseLifetime_t precise) {
|
|
if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
|
|
llvm::PointerType *addrTy = cast<llvm::PointerType>(addr->getType());
|
|
llvm::Value *null = llvm::ConstantPointerNull::get(
|
|
cast<llvm::PointerType>(addrTy->getElementType()));
|
|
EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
|
|
return;
|
|
}
|
|
|
|
llvm::Value *value = Builder.CreateLoad(addr);
|
|
EmitARCRelease(value, precise);
|
|
}
|
|
|
|
/// Store into a strong object. Always calls this:
|
|
/// call void \@objc_storeStrong(i8** %addr, i8* %value)
|
|
llvm::Value *CodeGenFunction::EmitARCStoreStrongCall(llvm::Value *addr,
|
|
llvm::Value *value,
|
|
bool ignored) {
|
|
assert(cast<llvm::PointerType>(addr->getType())->getElementType()
|
|
== value->getType());
|
|
|
|
llvm::Constant *&fn = CGM.getARCEntrypoints().objc_storeStrong;
|
|
if (!fn) {
|
|
llvm::Type *argTypes[] = { Int8PtrPtrTy, Int8PtrTy };
|
|
llvm::FunctionType *fnType
|
|
= llvm::FunctionType::get(Builder.getVoidTy(), argTypes, false);
|
|
fn = createARCRuntimeFunction(CGM, fnType, "objc_storeStrong");
|
|
}
|
|
|
|
llvm::Value *args[] = {
|
|
Builder.CreateBitCast(addr, Int8PtrPtrTy),
|
|
Builder.CreateBitCast(value, Int8PtrTy)
|
|
};
|
|
EmitNounwindRuntimeCall(fn, args);
|
|
|
|
if (ignored) return 0;
|
|
return value;
|
|
}
|
|
|
|
/// Store into a strong object. Sometimes calls this:
|
|
/// call void \@objc_storeStrong(i8** %addr, i8* %value)
|
|
/// Other times, breaks it down into components.
|
|
llvm::Value *CodeGenFunction::EmitARCStoreStrong(LValue dst,
|
|
llvm::Value *newValue,
|
|
bool ignored) {
|
|
QualType type = dst.getType();
|
|
bool isBlock = type->isBlockPointerType();
|
|
|
|
// Use a store barrier at -O0 unless this is a block type or the
|
|
// lvalue is inadequately aligned.
|
|
if (shouldUseFusedARCCalls() &&
|
|
!isBlock &&
|
|
(dst.getAlignment().isZero() ||
|
|
dst.getAlignment() >= CharUnits::fromQuantity(PointerAlignInBytes))) {
|
|
return EmitARCStoreStrongCall(dst.getAddress(), newValue, ignored);
|
|
}
|
|
|
|
// Otherwise, split it out.
|
|
|
|
// Retain the new value.
|
|
newValue = EmitARCRetain(type, newValue);
|
|
|
|
// Read the old value.
|
|
llvm::Value *oldValue = EmitLoadOfScalar(dst, SourceLocation());
|
|
|
|
// Store. We do this before the release so that any deallocs won't
|
|
// see the old value.
|
|
EmitStoreOfScalar(newValue, dst);
|
|
|
|
// Finally, release the old value.
|
|
EmitARCRelease(oldValue, dst.isARCPreciseLifetime());
|
|
|
|
return newValue;
|
|
}
|
|
|
|
/// Autorelease the given object.
|
|
/// call i8* \@objc_autorelease(i8* %value)
|
|
llvm::Value *CodeGenFunction::EmitARCAutorelease(llvm::Value *value) {
|
|
return emitARCValueOperation(*this, value,
|
|
CGM.getARCEntrypoints().objc_autorelease,
|
|
"objc_autorelease");
|
|
}
|
|
|
|
/// Autorelease the given object.
|
|
/// call i8* \@objc_autoreleaseReturnValue(i8* %value)
|
|
llvm::Value *
|
|
CodeGenFunction::EmitARCAutoreleaseReturnValue(llvm::Value *value) {
|
|
return emitARCValueOperation(*this, value,
|
|
CGM.getARCEntrypoints().objc_autoreleaseReturnValue,
|
|
"objc_autoreleaseReturnValue",
|
|
/*isTailCall*/ true);
|
|
}
|
|
|
|
/// Do a fused retain/autorelease of the given object.
|
|
/// call i8* \@objc_retainAutoreleaseReturnValue(i8* %value)
|
|
llvm::Value *
|
|
CodeGenFunction::EmitARCRetainAutoreleaseReturnValue(llvm::Value *value) {
|
|
return emitARCValueOperation(*this, value,
|
|
CGM.getARCEntrypoints().objc_retainAutoreleaseReturnValue,
|
|
"objc_retainAutoreleaseReturnValue",
|
|
/*isTailCall*/ true);
|
|
}
|
|
|
|
/// Do a fused retain/autorelease of the given object.
|
|
/// call i8* \@objc_retainAutorelease(i8* %value)
|
|
/// or
|
|
/// %retain = call i8* \@objc_retainBlock(i8* %value)
|
|
/// call i8* \@objc_autorelease(i8* %retain)
|
|
llvm::Value *CodeGenFunction::EmitARCRetainAutorelease(QualType type,
|
|
llvm::Value *value) {
|
|
if (!type->isBlockPointerType())
|
|
return EmitARCRetainAutoreleaseNonBlock(value);
|
|
|
|
if (isa<llvm::ConstantPointerNull>(value)) return value;
|
|
|
|
llvm::Type *origType = value->getType();
|
|
value = Builder.CreateBitCast(value, Int8PtrTy);
|
|
value = EmitARCRetainBlock(value, /*mandatory*/ true);
|
|
value = EmitARCAutorelease(value);
|
|
return Builder.CreateBitCast(value, origType);
|
|
}
|
|
|
|
/// Do a fused retain/autorelease of the given object.
|
|
/// call i8* \@objc_retainAutorelease(i8* %value)
|
|
llvm::Value *
|
|
CodeGenFunction::EmitARCRetainAutoreleaseNonBlock(llvm::Value *value) {
|
|
return emitARCValueOperation(*this, value,
|
|
CGM.getARCEntrypoints().objc_retainAutorelease,
|
|
"objc_retainAutorelease");
|
|
}
|
|
|
|
/// i8* \@objc_loadWeak(i8** %addr)
|
|
/// Essentially objc_autorelease(objc_loadWeakRetained(addr)).
|
|
llvm::Value *CodeGenFunction::EmitARCLoadWeak(llvm::Value *addr) {
|
|
return emitARCLoadOperation(*this, addr,
|
|
CGM.getARCEntrypoints().objc_loadWeak,
|
|
"objc_loadWeak");
|
|
}
|
|
|
|
/// i8* \@objc_loadWeakRetained(i8** %addr)
|
|
llvm::Value *CodeGenFunction::EmitARCLoadWeakRetained(llvm::Value *addr) {
|
|
return emitARCLoadOperation(*this, addr,
|
|
CGM.getARCEntrypoints().objc_loadWeakRetained,
|
|
"objc_loadWeakRetained");
|
|
}
|
|
|
|
/// i8* \@objc_storeWeak(i8** %addr, i8* %value)
|
|
/// Returns %value.
|
|
llvm::Value *CodeGenFunction::EmitARCStoreWeak(llvm::Value *addr,
|
|
llvm::Value *value,
|
|
bool ignored) {
|
|
return emitARCStoreOperation(*this, addr, value,
|
|
CGM.getARCEntrypoints().objc_storeWeak,
|
|
"objc_storeWeak", ignored);
|
|
}
|
|
|
|
/// i8* \@objc_initWeak(i8** %addr, i8* %value)
|
|
/// Returns %value. %addr is known to not have a current weak entry.
|
|
/// Essentially equivalent to:
|
|
/// *addr = nil; objc_storeWeak(addr, value);
|
|
void CodeGenFunction::EmitARCInitWeak(llvm::Value *addr, llvm::Value *value) {
|
|
// If we're initializing to null, just write null to memory; no need
|
|
// to get the runtime involved. But don't do this if optimization
|
|
// is enabled, because accounting for this would make the optimizer
|
|
// much more complicated.
|
|
if (isa<llvm::ConstantPointerNull>(value) &&
|
|
CGM.getCodeGenOpts().OptimizationLevel == 0) {
|
|
Builder.CreateStore(value, addr);
|
|
return;
|
|
}
|
|
|
|
emitARCStoreOperation(*this, addr, value,
|
|
CGM.getARCEntrypoints().objc_initWeak,
|
|
"objc_initWeak", /*ignored*/ true);
|
|
}
|
|
|
|
/// void \@objc_destroyWeak(i8** %addr)
|
|
/// Essentially objc_storeWeak(addr, nil).
|
|
void CodeGenFunction::EmitARCDestroyWeak(llvm::Value *addr) {
|
|
llvm::Constant *&fn = CGM.getARCEntrypoints().objc_destroyWeak;
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrPtrTy, false);
|
|
fn = createARCRuntimeFunction(CGM, fnType, "objc_destroyWeak");
|
|
}
|
|
|
|
// Cast the argument to 'id*'.
|
|
addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
|
|
|
|
EmitNounwindRuntimeCall(fn, addr);
|
|
}
|
|
|
|
/// void \@objc_moveWeak(i8** %dest, i8** %src)
|
|
/// Disregards the current value in %dest. Leaves %src pointing to nothing.
|
|
/// Essentially (objc_copyWeak(dest, src), objc_destroyWeak(src)).
|
|
void CodeGenFunction::EmitARCMoveWeak(llvm::Value *dst, llvm::Value *src) {
|
|
emitARCCopyOperation(*this, dst, src,
|
|
CGM.getARCEntrypoints().objc_moveWeak,
|
|
"objc_moveWeak");
|
|
}
|
|
|
|
/// void \@objc_copyWeak(i8** %dest, i8** %src)
|
|
/// Disregards the current value in %dest. Essentially
|
|
/// objc_release(objc_initWeak(dest, objc_readWeakRetained(src)))
|
|
void CodeGenFunction::EmitARCCopyWeak(llvm::Value *dst, llvm::Value *src) {
|
|
emitARCCopyOperation(*this, dst, src,
|
|
CGM.getARCEntrypoints().objc_copyWeak,
|
|
"objc_copyWeak");
|
|
}
|
|
|
|
/// Produce the code to do a objc_autoreleasepool_push.
|
|
/// call i8* \@objc_autoreleasePoolPush(void)
|
|
llvm::Value *CodeGenFunction::EmitObjCAutoreleasePoolPush() {
|
|
llvm::Constant *&fn = CGM.getRREntrypoints().objc_autoreleasePoolPush;
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(Int8PtrTy, false);
|
|
fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPush");
|
|
}
|
|
|
|
return EmitNounwindRuntimeCall(fn);
|
|
}
|
|
|
|
/// Produce the code to do a primitive release.
|
|
/// call void \@objc_autoreleasePoolPop(i8* %ptr)
|
|
void CodeGenFunction::EmitObjCAutoreleasePoolPop(llvm::Value *value) {
|
|
assert(value->getType() == Int8PtrTy);
|
|
|
|
llvm::Constant *&fn = CGM.getRREntrypoints().objc_autoreleasePoolPop;
|
|
if (!fn) {
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
|
|
|
|
// We don't want to use a weak import here; instead we should not
|
|
// fall into this path.
|
|
fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPop");
|
|
}
|
|
|
|
// objc_autoreleasePoolPop can throw.
|
|
EmitRuntimeCallOrInvoke(fn, value);
|
|
}
|
|
|
|
/// Produce the code to do an MRR version objc_autoreleasepool_push.
|
|
/// Which is: [[NSAutoreleasePool alloc] init];
|
|
/// Where alloc is declared as: + (id) alloc; in NSAutoreleasePool class.
|
|
/// init is declared as: - (id) init; in its NSObject super class.
|
|
///
|
|
llvm::Value *CodeGenFunction::EmitObjCMRRAutoreleasePoolPush() {
|
|
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
|
|
llvm::Value *Receiver = Runtime.EmitNSAutoreleasePoolClassRef(*this);
|
|
// [NSAutoreleasePool alloc]
|
|
IdentifierInfo *II = &CGM.getContext().Idents.get("alloc");
|
|
Selector AllocSel = getContext().Selectors.getSelector(0, &II);
|
|
CallArgList Args;
|
|
RValue AllocRV =
|
|
Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
|
|
getContext().getObjCIdType(),
|
|
AllocSel, Receiver, Args);
|
|
|
|
// [Receiver init]
|
|
Receiver = AllocRV.getScalarVal();
|
|
II = &CGM.getContext().Idents.get("init");
|
|
Selector InitSel = getContext().Selectors.getSelector(0, &II);
|
|
RValue InitRV =
|
|
Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
|
|
getContext().getObjCIdType(),
|
|
InitSel, Receiver, Args);
|
|
return InitRV.getScalarVal();
|
|
}
|
|
|
|
/// Produce the code to do a primitive release.
|
|
/// [tmp drain];
|
|
void CodeGenFunction::EmitObjCMRRAutoreleasePoolPop(llvm::Value *Arg) {
|
|
IdentifierInfo *II = &CGM.getContext().Idents.get("drain");
|
|
Selector DrainSel = getContext().Selectors.getSelector(0, &II);
|
|
CallArgList Args;
|
|
CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
|
|
getContext().VoidTy, DrainSel, Arg, Args);
|
|
}
|
|
|
|
void CodeGenFunction::destroyARCStrongPrecise(CodeGenFunction &CGF,
|
|
llvm::Value *addr,
|
|
QualType type) {
|
|
CGF.EmitARCDestroyStrong(addr, ARCPreciseLifetime);
|
|
}
|
|
|
|
void CodeGenFunction::destroyARCStrongImprecise(CodeGenFunction &CGF,
|
|
llvm::Value *addr,
|
|
QualType type) {
|
|
CGF.EmitARCDestroyStrong(addr, ARCImpreciseLifetime);
|
|
}
|
|
|
|
void CodeGenFunction::destroyARCWeak(CodeGenFunction &CGF,
|
|
llvm::Value *addr,
|
|
QualType type) {
|
|
CGF.EmitARCDestroyWeak(addr);
|
|
}
|
|
|
|
namespace {
|
|
struct CallObjCAutoreleasePoolObject : EHScopeStack::Cleanup {
|
|
llvm::Value *Token;
|
|
|
|
CallObjCAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
|
|
|
|
void Emit(CodeGenFunction &CGF, Flags flags) {
|
|
CGF.EmitObjCAutoreleasePoolPop(Token);
|
|
}
|
|
};
|
|
struct CallObjCMRRAutoreleasePoolObject : EHScopeStack::Cleanup {
|
|
llvm::Value *Token;
|
|
|
|
CallObjCMRRAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
|
|
|
|
void Emit(CodeGenFunction &CGF, Flags flags) {
|
|
CGF.EmitObjCMRRAutoreleasePoolPop(Token);
|
|
}
|
|
};
|
|
}
|
|
|
|
void CodeGenFunction::EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr) {
|
|
if (CGM.getLangOpts().ObjCAutoRefCount)
|
|
EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, Ptr);
|
|
else
|
|
EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, Ptr);
|
|
}
|
|
|
|
static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
|
|
LValue lvalue,
|
|
QualType type) {
|
|
switch (type.getObjCLifetime()) {
|
|
case Qualifiers::OCL_None:
|
|
case Qualifiers::OCL_ExplicitNone:
|
|
case Qualifiers::OCL_Strong:
|
|
case Qualifiers::OCL_Autoreleasing:
|
|
return TryEmitResult(CGF.EmitLoadOfLValue(lvalue,
|
|
SourceLocation()).getScalarVal(),
|
|
false);
|
|
|
|
case Qualifiers::OCL_Weak:
|
|
return TryEmitResult(CGF.EmitARCLoadWeakRetained(lvalue.getAddress()),
|
|
true);
|
|
}
|
|
|
|
llvm_unreachable("impossible lifetime!");
|
|
}
|
|
|
|
static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
|
|
const Expr *e) {
|
|
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,
|
|
SourceLocation()).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.
|
|
if (CGF.getLangOpts().CPlusPlus &&
|
|
!type.isVolatileQualified() &&
|
|
type.getObjCLifetime() == Qualifiers::OCL_Weak &&
|
|
isa<BinaryOperator>(e) &&
|
|
cast<BinaryOperator>(e)->getOpcode() == BO_Assign)
|
|
return TryEmitResult(CGF.EmitScalarExpr(e), false);
|
|
|
|
return tryEmitARCRetainLoadOfScalar(CGF, CGF.EmitLValue(e), type);
|
|
}
|
|
|
|
static llvm::Value *emitARCRetainAfterCall(CodeGenFunction &CGF,
|
|
llvm::Value *value);
|
|
|
|
/// Given that the given expression is some sort of call (which does
|
|
/// not return retained), emit a retain following it.
|
|
static llvm::Value *emitARCRetainCall(CodeGenFunction &CGF, const Expr *e) {
|
|
llvm::Value *value = CGF.EmitScalarExpr(e);
|
|
return emitARCRetainAfterCall(CGF, value);
|
|
}
|
|
|
|
static llvm::Value *emitARCRetainAfterCall(CodeGenFunction &CGF,
|
|
llvm::Value *value) {
|
|
if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(value)) {
|
|
CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
|
|
|
|
// Place the retain immediately following the call.
|
|
CGF.Builder.SetInsertPoint(call->getParent(),
|
|
++llvm::BasicBlock::iterator(call));
|
|
value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
|
|
|
|
CGF.Builder.restoreIP(ip);
|
|
return value;
|
|
} else if (llvm::InvokeInst *invoke = dyn_cast<llvm::InvokeInst>(value)) {
|
|
CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
|
|
|
|
// Place the retain at the beginning of the normal destination block.
|
|
llvm::BasicBlock *BB = invoke->getNormalDest();
|
|
CGF.Builder.SetInsertPoint(BB, BB->begin());
|
|
value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
|
|
|
|
CGF.Builder.restoreIP(ip);
|
|
return value;
|
|
|
|
// Bitcasts can arise because of related-result returns. Rewrite
|
|
// the operand.
|
|
} else if (llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(value)) {
|
|
llvm::Value *operand = bitcast->getOperand(0);
|
|
operand = emitARCRetainAfterCall(CGF, operand);
|
|
bitcast->setOperand(0, operand);
|
|
return bitcast;
|
|
|
|
// Generic fall-back case.
|
|
} else {
|
|
// Retain using the non-block variant: we never need to do a copy
|
|
// of a block that's been returned to us.
|
|
return CGF.EmitARCRetainNonBlock(value);
|
|
}
|
|
}
|
|
|
|
/// 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;
|
|
}
|
|
|
|
/// Try to emit a PseudoObjectExpr at +1.
|
|
///
|
|
/// This massively duplicates emitPseudoObjectRValue.
|
|
static TryEmitResult tryEmitARCRetainPseudoObject(CodeGenFunction &CGF,
|
|
const PseudoObjectExpr *E) {
|
|
SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
|
|
|
|
// Find the result expression.
|
|
const Expr *resultExpr = E->getResultExpr();
|
|
assert(resultExpr);
|
|
TryEmitResult result;
|
|
|
|
for (PseudoObjectExpr::const_semantics_iterator
|
|
i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
|
|
const Expr *semantic = *i;
|
|
|
|
// If this semantic expression is an opaque value, bind it
|
|
// to the result of its source expression.
|
|
if (const OpaqueValueExpr *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
|
|
typedef CodeGenFunction::OpaqueValueMappingData OVMA;
|
|
OVMA opaqueData;
|
|
|
|
// If this semantic is the result of the pseudo-object
|
|
// expression, try to evaluate the source as +1.
|
|
if (ov == resultExpr) {
|
|
assert(!OVMA::shouldBindAsLValue(ov));
|
|
result = tryEmitARCRetainScalarExpr(CGF, ov->getSourceExpr());
|
|
opaqueData = OVMA::bind(CGF, ov, RValue::get(result.getPointer()));
|
|
|
|
// Otherwise, just bind it.
|
|
} else {
|
|
opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
|
|
}
|
|
opaques.push_back(opaqueData);
|
|
|
|
// Otherwise, if the expression is the result, evaluate it
|
|
// and remember the result.
|
|
} else if (semantic == resultExpr) {
|
|
result = tryEmitARCRetainScalarExpr(CGF, semantic);
|
|
|
|
// Otherwise, evaluate the expression in an ignored context.
|
|
} else {
|
|
CGF.EmitIgnoredExpr(semantic);
|
|
}
|
|
}
|
|
|
|
// Unbind all the opaques now.
|
|
for (unsigned i = 0, e = opaques.size(); i != e; ++i)
|
|
opaques[i].unbind(CGF);
|
|
|
|
return result;
|
|
}
|
|
|
|
static TryEmitResult
|
|
tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) {
|
|
// We should *never* see a nested full-expression here, because if
|
|
// we fail to emit at +1, our caller must not retain after we close
|
|
// out the full-expression.
|
|
assert(!isa<ExprWithCleanups>(e));
|
|
|
|
// The desired result type, if it differs from the type of the
|
|
// ultimate opaque expression.
|
|
llvm::Type *resultType = 0;
|
|
|
|
while (true) {
|
|
e = e->IgnoreParens();
|
|
|
|
// There's a break at the end of this if-chain; anything
|
|
// that wants to keep looping has to explicitly continue.
|
|
if (const CastExpr *ce = dyn_cast<CastExpr>(e)) {
|
|
switch (ce->getCastKind()) {
|
|
// No-op casts don't change the type, so we just ignore them.
|
|
case CK_NoOp:
|
|
e = ce->getSubExpr();
|
|
continue;
|
|
|
|
case CK_LValueToRValue: {
|
|
TryEmitResult loadResult
|
|
= tryEmitARCRetainLoadOfScalar(CGF, ce->getSubExpr());
|
|
if (resultType) {
|
|
llvm::Value *value = loadResult.getPointer();
|
|
value = CGF.Builder.CreateBitCast(value, resultType);
|
|
loadResult.setPointer(value);
|
|
}
|
|
return loadResult;
|
|
}
|
|
|
|
// These casts can change the type, so remember that and
|
|
// soldier on. We only need to remember the outermost such
|
|
// cast, though.
|
|
case CK_CPointerToObjCPointerCast:
|
|
case CK_BlockPointerToObjCPointerCast:
|
|
case CK_AnyPointerToBlockPointerCast:
|
|
case CK_BitCast:
|
|
if (!resultType)
|
|
resultType = CGF.ConvertType(ce->getType());
|
|
e = ce->getSubExpr();
|
|
assert(e->getType()->hasPointerRepresentation());
|
|
continue;
|
|
|
|
// For consumptions, just emit the subexpression and thus elide
|
|
// the retain/release pair.
|
|
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_ARCReclaimReturnedObject: {
|
|
llvm::Value *result = emitARCRetainCall(CGF, ce->getSubExpr());
|
|
if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
|
|
return TryEmitResult(result, true);
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// Skip __extension__.
|
|
} else if (const UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
|
|
if (op->getOpcode() == UO_Extension) {
|
|
e = op->getSubExpr();
|
|
continue;
|
|
}
|
|
|
|
// For calls and message sends, use the retained-call logic.
|
|
// Delegate inits are a special case in that they're the only
|
|
// returns-retained expression that *isn't* surrounded by
|
|
// a consume.
|
|
} else if (isa<CallExpr>(e) ||
|
|
(isa<ObjCMessageExpr>(e) &&
|
|
!cast<ObjCMessageExpr>(e)->isDelegateInitCall())) {
|
|
llvm::Value *result = emitARCRetainCall(CGF, e);
|
|
if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
|
|
return TryEmitResult(result, true);
|
|
|
|
// Look through pseudo-object expressions.
|
|
} else if (const PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
|
|
TryEmitResult result
|
|
= tryEmitARCRetainPseudoObject(CGF, pseudo);
|
|
if (resultType) {
|
|
llvm::Value *value = result.getPointer();
|
|
value = CGF.Builder.CreateBitCast(value, resultType);
|
|
result.setPointer(value);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
// Conservatively halt the search at any other expression kind.
|
|
break;
|
|
}
|
|
|
|
// We didn't find an obvious production, so emit what we've got and
|
|
// tell the caller that we didn't manage to retain.
|
|
llvm::Value *result = CGF.EmitScalarExpr(e);
|
|
if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
|
|
return TryEmitResult(result, false);
|
|
}
|
|
|
|
static llvm::Value *emitARCRetainLoadOfScalar(CodeGenFunction &CGF,
|
|
LValue lvalue,
|
|
QualType type) {
|
|
TryEmitResult result = tryEmitARCRetainLoadOfScalar(CGF, lvalue, type);
|
|
llvm::Value *value = result.getPointer();
|
|
if (!result.getInt())
|
|
value = CGF.EmitARCRetain(type, value);
|
|
return value;
|
|
}
|
|
|
|
/// EmitARCRetainScalarExpr - Semantically equivalent to
|
|
/// EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a
|
|
/// best-effort attempt to peephole expressions that naturally produce
|
|
/// retained objects.
|
|
llvm::Value *CodeGenFunction::EmitARCRetainScalarExpr(const Expr *e) {
|
|
// The retain needs to happen within the full-expression.
|
|
if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
|
|
enterFullExpression(cleanups);
|
|
RunCleanupsScope scope(*this);
|
|
return EmitARCRetainScalarExpr(cleanups->getSubExpr());
|
|
}
|
|
|
|
TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
|
|
llvm::Value *value = result.getPointer();
|
|
if (!result.getInt())
|
|
value = EmitARCRetain(e->getType(), value);
|
|
return value;
|
|
}
|
|
|
|
llvm::Value *
|
|
CodeGenFunction::EmitARCRetainAutoreleaseScalarExpr(const Expr *e) {
|
|
// The retain needs to happen within the full-expression.
|
|
if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
|
|
enterFullExpression(cleanups);
|
|
RunCleanupsScope scope(*this);
|
|
return EmitARCRetainAutoreleaseScalarExpr(cleanups->getSubExpr());
|
|
}
|
|
|
|
TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
|
|
llvm::Value *value = result.getPointer();
|
|
if (result.getInt())
|
|
value = EmitARCAutorelease(value);
|
|
else
|
|
value = EmitARCRetainAutorelease(e->getType(), value);
|
|
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 (getLangOpts().ObjCAutoRefCount) {
|
|
// Do so before running any cleanups for the full-expression.
|
|
// EmitARCRetainAutoreleaseScalarExpr does this for us.
|
|
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) {
|
|
// Evaluate the RHS first.
|
|
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 (hasImmediateRetain) {
|
|
llvm::Value *oldValue = EmitLoadOfScalar(lvalue, SourceLocation());
|
|
EmitStoreOfScalar(value, lvalue);
|
|
EmitARCRelease(oldValue, lvalue.isARCPreciseLifetime());
|
|
} else {
|
|
value = EmitARCStoreStrong(lvalue, value, ignored);
|
|
}
|
|
|
|
return std::pair<LValue,llvm::Value*>(lvalue, value);
|
|
}
|
|
|
|
std::pair<LValue,llvm::Value*>
|
|
CodeGenFunction::EmitARCStoreAutoreleasing(const BinaryOperator *e) {
|
|
llvm::Value *value = EmitARCRetainAutoreleaseScalarExpr(e->getRHS());
|
|
LValue lvalue = EmitLValue(e->getLHS());
|
|
|
|
EmitStoreOfScalar(value, lvalue);
|
|
|
|
return std::pair<LValue,llvm::Value*>(lvalue, value);
|
|
}
|
|
|
|
void CodeGenFunction::EmitObjCAutoreleasePoolStmt(
|
|
const ObjCAutoreleasePoolStmt &ARPS) {
|
|
const Stmt *subStmt = ARPS.getSubStmt();
|
|
const CompoundStmt &S = cast<CompoundStmt>(*subStmt);
|
|
|
|
CGDebugInfo *DI = getDebugInfo();
|
|
if (DI)
|
|
DI->EmitLexicalBlockStart(Builder, S.getLBracLoc());
|
|
|
|
// Keep track of the current cleanup stack depth.
|
|
RunCleanupsScope Scope(*this);
|
|
if (CGM.getLangOpts().ObjCRuntime.hasNativeARC()) {
|
|
llvm::Value *token = EmitObjCAutoreleasePoolPush();
|
|
EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, token);
|
|
} else {
|
|
llvm::Value *token = EmitObjCMRRAutoreleasePoolPush();
|
|
EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, token);
|
|
}
|
|
|
|
for (CompoundStmt::const_body_iterator I = S.body_begin(),
|
|
E = S.body_end(); I != E; ++I)
|
|
EmitStmt(*I);
|
|
|
|
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::FunctionType *extenderType
|
|
= llvm::FunctionType::get(VoidTy, VoidPtrTy, RequiredArgs::All);
|
|
llvm::Value *extender
|
|
= llvm::InlineAsm::get(extenderType,
|
|
/* assembly */ "",
|
|
/* constraints */ "r",
|
|
/* side effects */ true);
|
|
|
|
object = Builder.CreateBitCast(object, VoidPtrTy);
|
|
EmitNounwindRuntimeCall(extender, object);
|
|
}
|
|
|
|
/// GenerateObjCAtomicSetterCopyHelperFunction - Given a c++ object type with
|
|
/// non-trivial copy assignment function, produce following helper function.
|
|
/// static void copyHelper(Ty *dest, const Ty *source) { *dest = *source; }
|
|
///
|
|
llvm::Constant *
|
|
CodeGenFunction::GenerateObjCAtomicSetterCopyHelperFunction(
|
|
const ObjCPropertyImplDecl *PID) {
|
|
if (!getLangOpts().CPlusPlus ||
|
|
!getLangOpts().ObjCRuntime.hasAtomicCopyHelper())
|
|
return 0;
|
|
QualType Ty = PID->getPropertyIvarDecl()->getType();
|
|
if (!Ty->isRecordType())
|
|
return 0;
|
|
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
|
|
if ((!(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_atomic)))
|
|
return 0;
|
|
llvm::Constant * HelperFn = 0;
|
|
if (hasTrivialSetExpr(PID))
|
|
return 0;
|
|
assert(PID->getSetterCXXAssignment() && "SetterCXXAssignment - null");
|
|
if ((HelperFn = CGM.getAtomicSetterHelperFnMap(Ty)))
|
|
return HelperFn;
|
|
|
|
ASTContext &C = getContext();
|
|
IdentifierInfo *II
|
|
= &CGM.getContext().Idents.get("__assign_helper_atomic_property_");
|
|
FunctionDecl *FD = FunctionDecl::Create(C,
|
|
C.getTranslationUnitDecl(),
|
|
SourceLocation(),
|
|
SourceLocation(), II, C.VoidTy, 0,
|
|
SC_Static,
|
|
false,
|
|
false);
|
|
|
|
QualType DestTy = C.getPointerType(Ty);
|
|
QualType SrcTy = Ty;
|
|
SrcTy.addConst();
|
|
SrcTy = C.getPointerType(SrcTy);
|
|
|
|
FunctionArgList args;
|
|
ImplicitParamDecl dstDecl(FD, SourceLocation(), 0, DestTy);
|
|
args.push_back(&dstDecl);
|
|
ImplicitParamDecl srcDecl(FD, SourceLocation(), 0, SrcTy);
|
|
args.push_back(&srcDecl);
|
|
|
|
const CGFunctionInfo &FI = CGM.getTypes().arrangeFreeFunctionDeclaration(
|
|
C.VoidTy, args, FunctionType::ExtInfo(), RequiredArgs::All);
|
|
|
|
llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
|
|
|
|
llvm::Function *Fn =
|
|
llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
|
|
"__assign_helper_atomic_property_",
|
|
&CGM.getModule());
|
|
|
|
StartFunction(FD, C.VoidTy, Fn, FI, args, SourceLocation());
|
|
|
|
DeclRefExpr DstExpr(&dstDecl, false, DestTy,
|
|
VK_RValue, SourceLocation());
|
|
UnaryOperator DST(&DstExpr, UO_Deref, DestTy->getPointeeType(),
|
|
VK_LValue, OK_Ordinary, SourceLocation());
|
|
|
|
DeclRefExpr SrcExpr(&srcDecl, false, SrcTy,
|
|
VK_RValue, SourceLocation());
|
|
UnaryOperator SRC(&SrcExpr, UO_Deref, SrcTy->getPointeeType(),
|
|
VK_LValue, OK_Ordinary, SourceLocation());
|
|
|
|
Expr *Args[2] = { &DST, &SRC };
|
|
CallExpr *CalleeExp = cast<CallExpr>(PID->getSetterCXXAssignment());
|
|
CXXOperatorCallExpr TheCall(C, OO_Equal, CalleeExp->getCallee(),
|
|
Args, DestTy->getPointeeType(),
|
|
VK_LValue, SourceLocation(), false);
|
|
|
|
EmitStmt(&TheCall);
|
|
|
|
FinishFunction();
|
|
HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
|
|
CGM.setAtomicSetterHelperFnMap(Ty, HelperFn);
|
|
return HelperFn;
|
|
}
|
|
|
|
llvm::Constant *
|
|
CodeGenFunction::GenerateObjCAtomicGetterCopyHelperFunction(
|
|
const ObjCPropertyImplDecl *PID) {
|
|
if (!getLangOpts().CPlusPlus ||
|
|
!getLangOpts().ObjCRuntime.hasAtomicCopyHelper())
|
|
return 0;
|
|
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
|
|
QualType Ty = PD->getType();
|
|
if (!Ty->isRecordType())
|
|
return 0;
|
|
if ((!(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_atomic)))
|
|
return 0;
|
|
llvm::Constant * HelperFn = 0;
|
|
|
|
if (hasTrivialGetExpr(PID))
|
|
return 0;
|
|
assert(PID->getGetterCXXConstructor() && "getGetterCXXConstructor - null");
|
|
if ((HelperFn = CGM.getAtomicGetterHelperFnMap(Ty)))
|
|
return HelperFn;
|
|
|
|
|
|
ASTContext &C = getContext();
|
|
IdentifierInfo *II
|
|
= &CGM.getContext().Idents.get("__copy_helper_atomic_property_");
|
|
FunctionDecl *FD = FunctionDecl::Create(C,
|
|
C.getTranslationUnitDecl(),
|
|
SourceLocation(),
|
|
SourceLocation(), II, C.VoidTy, 0,
|
|
SC_Static,
|
|
false,
|
|
false);
|
|
|
|
QualType DestTy = C.getPointerType(Ty);
|
|
QualType SrcTy = Ty;
|
|
SrcTy.addConst();
|
|
SrcTy = C.getPointerType(SrcTy);
|
|
|
|
FunctionArgList args;
|
|
ImplicitParamDecl dstDecl(FD, SourceLocation(), 0, DestTy);
|
|
args.push_back(&dstDecl);
|
|
ImplicitParamDecl srcDecl(FD, SourceLocation(), 0, SrcTy);
|
|
args.push_back(&srcDecl);
|
|
|
|
const CGFunctionInfo &FI = CGM.getTypes().arrangeFreeFunctionDeclaration(
|
|
C.VoidTy, args, FunctionType::ExtInfo(), RequiredArgs::All);
|
|
|
|
llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
|
|
|
|
llvm::Function *Fn =
|
|
llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
|
|
"__copy_helper_atomic_property_", &CGM.getModule());
|
|
|
|
StartFunction(FD, C.VoidTy, Fn, FI, args, SourceLocation());
|
|
|
|
DeclRefExpr SrcExpr(&srcDecl, false, SrcTy,
|
|
VK_RValue, SourceLocation());
|
|
|
|
UnaryOperator SRC(&SrcExpr, UO_Deref, SrcTy->getPointeeType(),
|
|
VK_LValue, OK_Ordinary, SourceLocation());
|
|
|
|
CXXConstructExpr *CXXConstExpr =
|
|
cast<CXXConstructExpr>(PID->getGetterCXXConstructor());
|
|
|
|
SmallVector<Expr*, 4> ConstructorArgs;
|
|
ConstructorArgs.push_back(&SRC);
|
|
CXXConstructExpr::arg_iterator A = CXXConstExpr->arg_begin();
|
|
++A;
|
|
|
|
for (CXXConstructExpr::arg_iterator AEnd = CXXConstExpr->arg_end();
|
|
A != AEnd; ++A)
|
|
ConstructorArgs.push_back(*A);
|
|
|
|
CXXConstructExpr *TheCXXConstructExpr =
|
|
CXXConstructExpr::Create(C, Ty, SourceLocation(),
|
|
CXXConstExpr->getConstructor(),
|
|
CXXConstExpr->isElidable(),
|
|
ConstructorArgs,
|
|
CXXConstExpr->hadMultipleCandidates(),
|
|
CXXConstExpr->isListInitialization(),
|
|
CXXConstExpr->requiresZeroInitialization(),
|
|
CXXConstExpr->getConstructionKind(),
|
|
SourceRange());
|
|
|
|
DeclRefExpr DstExpr(&dstDecl, false, DestTy,
|
|
VK_RValue, SourceLocation());
|
|
|
|
RValue DV = EmitAnyExpr(&DstExpr);
|
|
CharUnits Alignment
|
|
= getContext().getTypeAlignInChars(TheCXXConstructExpr->getType());
|
|
EmitAggExpr(TheCXXConstructExpr,
|
|
AggValueSlot::forAddr(DV.getScalarVal(), Alignment, Qualifiers(),
|
|
AggValueSlot::IsDestructed,
|
|
AggValueSlot::DoesNotNeedGCBarriers,
|
|
AggValueSlot::IsNotAliased));
|
|
|
|
FinishFunction();
|
|
HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
|
|
CGM.setAtomicGetterHelperFnMap(Ty, HelperFn);
|
|
return HelperFn;
|
|
}
|
|
|
|
llvm::Value *
|
|
CodeGenFunction::EmitBlockCopyAndAutorelease(llvm::Value *Block, QualType Ty) {
|
|
// Get selectors for retain/autorelease.
|
|
IdentifierInfo *CopyID = &getContext().Idents.get("copy");
|
|
Selector CopySelector =
|
|
getContext().Selectors.getNullarySelector(CopyID);
|
|
IdentifierInfo *AutoreleaseID = &getContext().Idents.get("autorelease");
|
|
Selector AutoreleaseSelector =
|
|
getContext().Selectors.getNullarySelector(AutoreleaseID);
|
|
|
|
// Emit calls to retain/autorelease.
|
|
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
|
|
llvm::Value *Val = Block;
|
|
RValue Result;
|
|
Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
|
|
Ty, CopySelector,
|
|
Val, CallArgList(), 0, 0);
|
|
Val = Result.getScalarVal();
|
|
Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
|
|
Ty, AutoreleaseSelector,
|
|
Val, CallArgList(), 0, 0);
|
|
Val = Result.getScalarVal();
|
|
return Val;
|
|
}
|
|
|
|
|
|
CGObjCRuntime::~CGObjCRuntime() {}
|