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clang-1/lib/CodeGen/CGObjC.cpp

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//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Objective-C code as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CGDebugInfo.h"
#include "CGObjCRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/StmtObjC.h"
#include "clang/Basic/Diagnostic.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Target/TargetData.h"
#include "llvm/InlineAsm.h"
using namespace clang;
using namespace CodeGen;
typedef llvm::PointerIntPair<llvm::Value*,1,bool> TryEmitResult;
static TryEmitResult
tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e);
/// Given the address of a variable of pointer type, find the correct
/// null to store into it.
static llvm::Constant *getNullForVariable(llvm::Value *addr) {
const llvm::Type *type =
cast<llvm::PointerType>(addr->getType())->getElementType();
return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(type));
}
/// Emits an instance of NSConstantString representing the object.
llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E)
{
llvm::Constant *C =
CGM.getObjCRuntime().GenerateConstantString(E->getString());
// FIXME: This bitcast should just be made an invariant on the Runtime.
return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
}
/// Emit a selector.
llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) {
// Untyped selector.
// Note that this implementation allows for non-constant strings to be passed
// as arguments to @selector(). Currently, the only thing preventing this
// behaviour is the type checking in the front end.
return CGM.getObjCRuntime().GetSelector(Builder, E->getSelector());
}
llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) {
// FIXME: This should pass the Decl not the name.
return CGM.getObjCRuntime().GenerateProtocolRef(Builder, E->getProtocol());
}
/// \brief Adjust the type of the result of an Objective-C message send
/// expression when the method has a related result type.
static RValue AdjustRelatedResultType(CodeGenFunction &CGF,
const Expr *E,
const ObjCMethodDecl *Method,
RValue Result) {
if (!Method)
return Result;
if (!Method->hasRelatedResultType() ||
CGF.getContext().hasSameType(E->getType(), Method->getResultType()) ||
!Result.isScalar())
return Result;
// We have applied a related result type. Cast the rvalue appropriately.
return RValue::get(CGF.Builder.CreateBitCast(Result.getScalarVal(),
CGF.ConvertType(E->getType())));
}
RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E,
ReturnValueSlot Return) {
// Only the lookup mechanism and first two arguments of the method
// implementation vary between runtimes. We can get the receiver and
// arguments in generic code.
bool isDelegateInit = E->isDelegateInitCall();
// We don't retain the receiver in delegate init calls, and this is
// safe because the receiver value is always loaded from 'self',
// which we zero out. We don't want to Block_copy block receivers,
// though.
bool retainSelf =
(!isDelegateInit &&
CGM.getLangOptions().ObjCAutoRefCount &&
E->getMethodDecl() &&
E->getMethodDecl()->hasAttr<NSConsumesSelfAttr>());
CGObjCRuntime &Runtime = CGM.getObjCRuntime();
bool isSuperMessage = false;
bool isClassMessage = false;
ObjCInterfaceDecl *OID = 0;
// Find the receiver
QualType ReceiverType;
llvm::Value *Receiver = 0;
switch (E->getReceiverKind()) {
case ObjCMessageExpr::Instance:
ReceiverType = E->getInstanceReceiver()->getType();
if (retainSelf) {
TryEmitResult ter = tryEmitARCRetainScalarExpr(*this,
E->getInstanceReceiver());
Receiver = ter.getPointer();
if (!ter.getInt())
Receiver = EmitARCRetainNonBlock(Receiver);
} else
Receiver = EmitScalarExpr(E->getInstanceReceiver());
break;
case ObjCMessageExpr::Class: {
ReceiverType = E->getClassReceiver();
const ObjCObjectType *ObjTy = ReceiverType->getAs<ObjCObjectType>();
assert(ObjTy && "Invalid Objective-C class message send");
OID = ObjTy->getInterface();
assert(OID && "Invalid Objective-C class message send");
Receiver = Runtime.GetClass(Builder, OID);
isClassMessage = true;
if (retainSelf)
Receiver = EmitARCRetainNonBlock(Receiver);
break;
}
case ObjCMessageExpr::SuperInstance:
ReceiverType = E->getSuperType();
Receiver = LoadObjCSelf();
isSuperMessage = true;
if (retainSelf)
Receiver = EmitARCRetainNonBlock(Receiver);
break;
case ObjCMessageExpr::SuperClass:
ReceiverType = E->getSuperType();
Receiver = LoadObjCSelf();
isSuperMessage = true;
isClassMessage = true;
if (retainSelf)
Receiver = EmitARCRetainNonBlock(Receiver);
break;
}
QualType ResultType =
E->getMethodDecl() ? E->getMethodDecl()->getResultType() : E->getType();
CallArgList Args;
EmitCallArgs(Args, E->getMethodDecl(), E->arg_begin(), E->arg_end());
// For delegate init calls in ARC, do an unsafe store of null into
// self. This represents the call taking direct ownership of that
// value. We have to do this after emitting the other call
// arguments because they might also reference self, but we don't
// have to worry about any of them modifying self because that would
// be an undefined read and write of an object in unordered
// expressions.
if (isDelegateInit) {
assert(getLangOptions().ObjCAutoRefCount &&
"delegate init calls should only be marked in ARC");
// Do an unsafe store of null into self.
llvm::Value *selfAddr =
LocalDeclMap[cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl()];
assert(selfAddr && "no self entry for a delegate init call?");
Builder.CreateStore(getNullForVariable(selfAddr), selfAddr);
}
RValue result;
if (isSuperMessage) {
// super is only valid in an Objective-C method
const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext());
result = Runtime.GenerateMessageSendSuper(*this, Return, ResultType,
E->getSelector(),
OMD->getClassInterface(),
isCategoryImpl,
Receiver,
isClassMessage,
Args,
E->getMethodDecl());
} else {
result = Runtime.GenerateMessageSend(*this, Return, ResultType,
E->getSelector(),
Receiver, Args, OID,
E->getMethodDecl());
}
// For delegate init calls in ARC, implicitly store the result of
// the call back into self. This takes ownership of the value.
if (isDelegateInit) {
llvm::Value *selfAddr =
LocalDeclMap[cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl()];
llvm::Value *newSelf = result.getScalarVal();
// The delegate return type isn't necessarily a matching type; in
// fact, it's quite likely to be 'id'.
const llvm::Type *selfTy =
cast<llvm::PointerType>(selfAddr->getType())->getElementType();
newSelf = Builder.CreateBitCast(newSelf, selfTy);
Builder.CreateStore(newSelf, selfAddr);
}
return AdjustRelatedResultType(*this, E, E->getMethodDecl(), result);
}
namespace {
struct FinishARCDealloc : EHScopeStack::Cleanup {
void Emit(CodeGenFunction &CGF, bool isForEH) {
const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CGF.CurCodeDecl);
const ObjCImplementationDecl *impl
= cast<ObjCImplementationDecl>(method->getDeclContext());
const ObjCInterfaceDecl *iface = impl->getClassInterface();
if (!iface->getSuperClass()) return;
// Call [super dealloc] if we have a superclass.
llvm::Value *self = CGF.LoadObjCSelf();
CallArgList args;
CGF.CGM.getObjCRuntime().GenerateMessageSendSuper(CGF, ReturnValueSlot(),
CGF.getContext().VoidTy,
method->getSelector(),
iface,
/*is category*/ false,
self,
/*is class msg*/ false,
args,
method);
}
};
}
/// StartObjCMethod - Begin emission of an ObjCMethod. This generates
/// the LLVM function and sets the other context used by
/// CodeGenFunction.
void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD,
const ObjCContainerDecl *CD,
SourceLocation StartLoc) {
FunctionArgList args;
// Check if we should generate debug info for this method.
if (CGM.getModuleDebugInfo() && !OMD->hasAttr<NoDebugAttr>())
DebugInfo = CGM.getModuleDebugInfo();
llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD);
const CGFunctionInfo &FI = CGM.getTypes().getFunctionInfo(OMD);
CGM.SetInternalFunctionAttributes(OMD, Fn, FI);
args.push_back(OMD->getSelfDecl());
args.push_back(OMD->getCmdDecl());
for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
E = OMD->param_end(); PI != E; ++PI)
args.push_back(*PI);
CurGD = OMD;
StartFunction(OMD, OMD->getResultType(), Fn, FI, args, StartLoc);
// In ARC, certain methods get an extra cleanup.
if (CGM.getLangOptions().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);
void CodeGenFunction::GenerateObjCGetterBody(ObjCIvarDecl *Ivar,
bool IsAtomic, bool IsStrong) {
LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(),
Ivar, 0);
llvm::Value *GetCopyStructFn =
CGM.getObjCRuntime().GetGetStructFunction();
CodeGenTypes &Types = CGM.getTypes();
// objc_copyStruct (ReturnValue, &structIvar,
// sizeof (Type of Ivar), isAtomic, false);
CallArgList Args;
RValue RV = RValue::get(Builder.CreateBitCast(ReturnValue, VoidPtrTy));
Args.add(RV, getContext().VoidPtrTy);
RV = RValue::get(Builder.CreateBitCast(LV.getAddress(), VoidPtrTy));
Args.add(RV, getContext().VoidPtrTy);
// sizeof (Type of Ivar)
CharUnits Size = getContext().getTypeSizeInChars(Ivar->getType());
llvm::Value *SizeVal =
llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy),
Size.getQuantity());
Args.add(RValue::get(SizeVal), getContext().LongTy);
llvm::Value *isAtomic =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy),
IsAtomic ? 1 : 0);
Args.add(RValue::get(isAtomic), getContext().BoolTy);
llvm::Value *hasStrong =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy),
IsStrong ? 1 : 0);
Args.add(RValue::get(hasStrong), getContext().BoolTy);
EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args,
FunctionType::ExtInfo()),
GetCopyStructFn, ReturnValueSlot(), Args);
}
/// Generate an Objective-C method. An Objective-C method is a C function with
/// its pointer, name, and types registered in the class struture.
void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) {
StartObjCMethod(OMD, OMD->getClassInterface(), OMD->getLocStart());
EmitStmt(OMD->getBody());
FinishFunction(OMD->getBodyRBrace());
}
// FIXME: I wasn't sure about the synthesis approach. If we end up generating an
// AST for the whole body we can just fall back to having a GenerateFunction
// which takes the body Stmt.
/// GenerateObjCGetter - Generate an Objective-C property getter
/// function. The given Decl must be an ObjCImplementationDecl. @synthesize
/// is illegal within a category.
void CodeGenFunction::GenerateObjCGetter(ObjCImplementationDecl *IMP,
const ObjCPropertyImplDecl *PID) {
ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl();
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
bool IsAtomic =
!(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic);
ObjCMethodDecl *OMD = PD->getGetterMethodDecl();
assert(OMD && "Invalid call to generate getter (empty method)");
StartObjCMethod(OMD, IMP->getClassInterface(), PID->getLocStart());
// Determine if we should use an objc_getProperty call for
// this. Non-atomic properties are directly evaluated.
// atomic 'copy' and 'retain' properties are also directly
// evaluated in gc-only mode.
if (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly &&
IsAtomic &&
(PD->getSetterKind() == ObjCPropertyDecl::Copy ||
PD->getSetterKind() == ObjCPropertyDecl::Retain)) {
llvm::Value *GetPropertyFn =
CGM.getObjCRuntime().GetPropertyGetFunction();
if (!GetPropertyFn) {
CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy");
FinishFunction();
return;
}
// Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true).
// FIXME: Can't this be simpler? This might even be worse than the
// corresponding gcc code.
CodeGenTypes &Types = CGM.getTypes();
ValueDecl *Cmd = OMD->getCmdDecl();
llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd");
QualType IdTy = getContext().getObjCIdType();
llvm::Value *SelfAsId =
Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy));
llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar);
llvm::Value *True =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1);
CallArgList Args;
Args.add(RValue::get(SelfAsId), IdTy);
Args.add(RValue::get(CmdVal), Cmd->getType());
Args.add(RValue::get(Offset), getContext().getPointerDiffType());
Args.add(RValue::get(True), getContext().BoolTy);
// FIXME: We shouldn't need to get the function info here, the
// runtime already should have computed it to build the function.
RValue RV = EmitCall(Types.getFunctionInfo(PD->getType(), Args,
FunctionType::ExtInfo()),
GetPropertyFn, ReturnValueSlot(), Args);
// We need to fix the type here. Ivars with copy & retain are
// always objects so we don't need to worry about complex or
// aggregates.
RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(),
Types.ConvertType(PD->getType())));
EmitReturnOfRValue(RV, PD->getType());
// objc_getProperty does an autorelease, so we should suppress ours.
AutoreleaseResult = false;
} else {
const llvm::Triple &Triple = getContext().Target.getTriple();
QualType IVART = Ivar->getType();
if (IsAtomic &&
IVART->isScalarType() &&
(Triple.getArch() == llvm::Triple::arm ||
Triple.getArch() == llvm::Triple::thumb) &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(4)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCGetterBody(Ivar, true, false);
}
else if (IsAtomic &&
(IVART->isScalarType() && !IVART->isRealFloatingType()) &&
Triple.getArch() == llvm::Triple::x86 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(4)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCGetterBody(Ivar, true, false);
}
else if (IsAtomic &&
(IVART->isScalarType() && !IVART->isRealFloatingType()) &&
Triple.getArch() == llvm::Triple::x86_64 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(8)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCGetterBody(Ivar, true, false);
}
else if (IVART->isAnyComplexType()) {
LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(),
Ivar, 0);
ComplexPairTy Pair = LoadComplexFromAddr(LV.getAddress(),
LV.isVolatileQualified());
StoreComplexToAddr(Pair, ReturnValue, LV.isVolatileQualified());
}
else if (hasAggregateLLVMType(IVART)) {
bool IsStrong = false;
if ((IsStrong = IvarTypeWithAggrGCObjects(IVART))
&& CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect
&& CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCGetterBody(Ivar, IsAtomic, IsStrong);
}
else {
const CXXRecordDecl *classDecl = IVART->getAsCXXRecordDecl();
if (PID->getGetterCXXConstructor() &&
classDecl && !classDecl->hasTrivialDefaultConstructor()) {
ReturnStmt *Stmt =
new (getContext()) ReturnStmt(SourceLocation(),
PID->getGetterCXXConstructor(),
0);
EmitReturnStmt(*Stmt);
} else if (IsAtomic &&
!IVART->isAnyComplexType() &&
Triple.getArch() == llvm::Triple::x86 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(4)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCGetterBody(Ivar, true, false);
}
else if (IsAtomic &&
!IVART->isAnyComplexType() &&
Triple.getArch() == llvm::Triple::x86_64 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(8)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCGetterBody(Ivar, true, false);
}
else {
LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(),
Ivar, 0);
EmitAggregateCopy(ReturnValue, LV.getAddress(), IVART);
}
}
}
else {
LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(),
Ivar, 0);
QualType propType = PD->getType();
llvm::Value *value;
if (propType->isReferenceType()) {
value = LV.getAddress();
} else {
// In ARC, we want to emit this retained.
if (getLangOptions().ObjCAutoRefCount &&
PD->getType()->isObjCRetainableType())
value = emitARCRetainLoadOfScalar(*this, LV, IVART);
else
value = EmitLoadOfLValue(LV, IVART).getScalarVal();
value = Builder.CreateBitCast(value, ConvertType(propType));
}
EmitReturnOfRValue(RValue::get(value), propType);
}
}
FinishFunction();
}
void CodeGenFunction::GenerateObjCAtomicSetterBody(ObjCMethodDecl *OMD,
ObjCIvarDecl *Ivar) {
// objc_copyStruct (&structIvar, &Arg,
// sizeof (struct something), true, false);
llvm::Value *GetCopyStructFn =
CGM.getObjCRuntime().GetSetStructFunction();
CodeGenTypes &Types = CGM.getTypes();
CallArgList Args;
LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), Ivar, 0);
RValue RV =
RValue::get(Builder.CreateBitCast(LV.getAddress(),
Types.ConvertType(getContext().VoidPtrTy)));
Args.add(RV, getContext().VoidPtrTy);
llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()];
llvm::Value *ArgAsPtrTy =
Builder.CreateBitCast(Arg,
Types.ConvertType(getContext().VoidPtrTy));
RV = RValue::get(ArgAsPtrTy);
Args.add(RV, getContext().VoidPtrTy);
// sizeof (Type of Ivar)
CharUnits Size = getContext().getTypeSizeInChars(Ivar->getType());
llvm::Value *SizeVal =
llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy),
Size.getQuantity());
Args.add(RValue::get(SizeVal), getContext().LongTy);
llvm::Value *True =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1);
Args.add(RValue::get(True), getContext().BoolTy);
llvm::Value *False =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0);
Args.add(RValue::get(False), getContext().BoolTy);
EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args,
FunctionType::ExtInfo()),
GetCopyStructFn, ReturnValueSlot(), Args);
}
static bool
IvarAssignHasTrvialAssignment(const ObjCPropertyImplDecl *PID,
QualType IvarT) {
bool HasTrvialAssignment = true;
if (PID->getSetterCXXAssignment()) {
const CXXRecordDecl *classDecl = IvarT->getAsCXXRecordDecl();
HasTrvialAssignment =
(!classDecl || classDecl->hasTrivialCopyAssignment());
}
return HasTrvialAssignment;
}
/// GenerateObjCSetter - 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) {
ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl();
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
ObjCMethodDecl *OMD = PD->getSetterMethodDecl();
assert(OMD && "Invalid call to generate setter (empty method)");
StartObjCMethod(OMD, IMP->getClassInterface(), PID->getLocStart());
const llvm::Triple &Triple = getContext().Target.getTriple();
QualType IVART = Ivar->getType();
bool IsCopy = PD->getSetterKind() == ObjCPropertyDecl::Copy;
bool IsAtomic =
!(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic);
// Determine if we should use an objc_setProperty call for
// this. Properties with 'copy' semantics always use it, as do
// non-atomic properties with 'release' semantics as long as we are
// not in gc-only mode.
if (IsCopy ||
(CGM.getLangOptions().getGCMode() != LangOptions::GCOnly &&
PD->getSetterKind() == ObjCPropertyDecl::Retain)) {
llvm::Value *SetPropertyFn =
CGM.getObjCRuntime().GetPropertySetFunction();
if (!SetPropertyFn) {
CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy");
FinishFunction();
return;
}
// Emit objc_setProperty((id) self, _cmd, offset, arg,
// <is-atomic>, <is-copy>).
// FIXME: Can't this be simpler? This might even be worse than the
// corresponding gcc code.
CodeGenTypes &Types = CGM.getTypes();
ValueDecl *Cmd = OMD->getCmdDecl();
llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd");
QualType IdTy = getContext().getObjCIdType();
llvm::Value *SelfAsId =
Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy));
llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar);
llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()];
llvm::Value *ArgAsId =
Builder.CreateBitCast(Builder.CreateLoad(Arg, "arg"),
Types.ConvertType(IdTy));
llvm::Value *True =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1);
llvm::Value *False =
llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0);
CallArgList Args;
Args.add(RValue::get(SelfAsId), IdTy);
Args.add(RValue::get(CmdVal), Cmd->getType());
Args.add(RValue::get(Offset), getContext().getPointerDiffType());
Args.add(RValue::get(ArgAsId), IdTy);
Args.add(RValue::get(IsAtomic ? True : False), getContext().BoolTy);
Args.add(RValue::get(IsCopy ? True : False), getContext().BoolTy);
// FIXME: We shouldn't need to get the function info here, the runtime
// already should have computed it to build the function.
EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args,
FunctionType::ExtInfo()),
SetPropertyFn,
ReturnValueSlot(), Args);
} else if (IsAtomic && hasAggregateLLVMType(IVART) &&
!IVART->isAnyComplexType() &&
IvarAssignHasTrvialAssignment(PID, IVART) &&
((Triple.getArch() == llvm::Triple::x86 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(4))) ||
(Triple.getArch() == llvm::Triple::x86_64 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(8))))
&& CGM.getObjCRuntime().GetSetStructFunction()) {
// objc_copyStruct (&structIvar, &Arg,
// sizeof (struct something), true, false);
GenerateObjCAtomicSetterBody(OMD, Ivar);
} else if (PID->getSetterCXXAssignment()) {
EmitIgnoredExpr(PID->getSetterCXXAssignment());
} else {
if (IsAtomic &&
IVART->isScalarType() &&
(Triple.getArch() == llvm::Triple::arm ||
Triple.getArch() == llvm::Triple::thumb) &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(4)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCAtomicSetterBody(OMD, Ivar);
}
else if (IsAtomic &&
(IVART->isScalarType() && !IVART->isRealFloatingType()) &&
Triple.getArch() == llvm::Triple::x86 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(4)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCAtomicSetterBody(OMD, Ivar);
}
else if (IsAtomic &&
(IVART->isScalarType() && !IVART->isRealFloatingType()) &&
Triple.getArch() == llvm::Triple::x86_64 &&
(getContext().getTypeSizeInChars(IVART)
> CharUnits::fromQuantity(8)) &&
CGM.getObjCRuntime().GetGetStructFunction()) {
GenerateObjCAtomicSetterBody(OMD, Ivar);
}
else {
// FIXME: Find a clean way to avoid AST node creation.
SourceLocation Loc = PID->getLocStart();
ValueDecl *Self = OMD->getSelfDecl();
ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl();
DeclRefExpr Base(Self, Self->getType(), VK_RValue, Loc);
ParmVarDecl *ArgDecl = *OMD->param_begin();
QualType T = ArgDecl->getType();
if (T->isReferenceType())
T = cast<ReferenceType>(T)->getPointeeType();
DeclRefExpr Arg(ArgDecl, T, VK_LValue, Loc);
ObjCIvarRefExpr IvarRef(Ivar, Ivar->getType(), Loc, &Base, true, true);
// The property type can differ from the ivar type in some situations with
// Objective-C pointer types, we can always bit cast the RHS in these cases.
if (getContext().getCanonicalType(Ivar->getType()) !=
getContext().getCanonicalType(ArgDecl->getType())) {
ImplicitCastExpr ArgCasted(ImplicitCastExpr::OnStack,
Ivar->getType(), CK_BitCast, &Arg,
VK_RValue);
BinaryOperator Assign(&IvarRef, &ArgCasted, BO_Assign,
Ivar->getType(), VK_RValue, OK_Ordinary, Loc);
EmitStmt(&Assign);
} else {
BinaryOperator Assign(&IvarRef, &Arg, BO_Assign,
Ivar->getType(), VK_RValue, OK_Ordinary, Loc);
EmitStmt(&Assign);
}
}
}
FinishFunction();
}
// FIXME: these are stolen from CGClass.cpp, which is lame.
namespace {
struct CallArrayIvarDtor : EHScopeStack::Cleanup {
const ObjCIvarDecl *ivar;
llvm::Value *self;
CallArrayIvarDtor(const ObjCIvarDecl *ivar, llvm::Value *self)
: ivar(ivar), self(self) {}
void Emit(CodeGenFunction &CGF, bool IsForEH) {
LValue lvalue =
CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), self, ivar, 0);
QualType type = ivar->getType();
const ConstantArrayType *arrayType
= CGF.getContext().getAsConstantArrayType(type);
QualType baseType = CGF.getContext().getBaseElementType(arrayType);
const CXXRecordDecl *classDecl = baseType->getAsCXXRecordDecl();
llvm::Value *base
= CGF.Builder.CreateBitCast(lvalue.getAddress(),
CGF.ConvertType(baseType)->getPointerTo());
CGF.EmitCXXAggrDestructorCall(classDecl->getDestructor(),
arrayType, base);
}
};
struct CallIvarDtor : EHScopeStack::Cleanup {
const ObjCIvarDecl *ivar;
llvm::Value *self;
CallIvarDtor(const ObjCIvarDecl *ivar, llvm::Value *self)
: ivar(ivar), self(self) {}
void Emit(CodeGenFunction &CGF, bool IsForEH) {
LValue lvalue =
CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), self, ivar, 0);
QualType type = ivar->getType();
const CXXRecordDecl *classDecl = type->getAsCXXRecordDecl();
CGF.EmitCXXDestructorCall(classDecl->getDestructor(),
Dtor_Complete, /*ForVirtualBase=*/false,
lvalue.getAddress());
}
};
}
static void pushReleaseForIvar(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
llvm::Value *self);
static void pushWeakReleaseForIvar(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
llvm::Value *self);
static void emitCXXDestructMethod(CodeGenFunction &CGF,
ObjCImplementationDecl *impl) {
CodeGenFunction::RunCleanupsScope scope(CGF);
llvm::Value *self = CGF.LoadObjCSelf();
ObjCInterfaceDecl *iface
= const_cast<ObjCInterfaceDecl*>(impl->getClassInterface());
for (ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
ivar; ivar = ivar->getNextIvar()) {
QualType type = ivar->getType();
// Drill down to the base element type.
QualType baseType = type;
const ConstantArrayType *arrayType =
CGF.getContext().getAsConstantArrayType(baseType);
if (arrayType) baseType = CGF.getContext().getBaseElementType(arrayType);
// Check whether the ivar is a destructible type.
QualType::DestructionKind destructKind = baseType.isDestructedType();
assert(destructKind == type.isDestructedType());
switch (destructKind) {
case QualType::DK_none:
continue;
case QualType::DK_cxx_destructor:
if (arrayType)
CGF.EHStack.pushCleanup<CallArrayIvarDtor>(NormalAndEHCleanup,
ivar, self);
else
CGF.EHStack.pushCleanup<CallIvarDtor>(NormalAndEHCleanup,
ivar, self);
break;
case QualType::DK_objc_strong_lifetime:
pushReleaseForIvar(CGF, ivar, self);
break;
case QualType::DK_objc_weak_lifetime:
pushWeakReleaseForIvar(CGF, ivar, self);
break;
}
}
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;
llvm::SmallVector<CXXCtorInitializer *, 8> IvarInitializers;
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, true));
}
// 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.getLangOptions().getGCMode() == LangOptions::NonGC)
return false;
if (const RecordType *FDTTy = Ty.getTypePtr()->getAs<RecordType>())
return FDTTy->getDecl()->hasObjectMember();
return false;
}
llvm::Value *CodeGenFunction::LoadObjCSelf() {
const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
return Builder.CreateLoad(LocalDeclMap[OMD->getSelfDecl()], "self");
}
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();
}
LValue
CodeGenFunction::EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E) {
// This is a special l-value that just issues sends when we load or
// store through it.
// For certain base kinds, we need to emit the base immediately.
llvm::Value *Base;
if (E->isSuperReceiver())
Base = LoadObjCSelf();
else if (E->isClassReceiver())
Base = CGM.getObjCRuntime().GetClass(Builder, E->getClassReceiver());
else
Base = EmitScalarExpr(E->getBase());
return LValue::MakePropertyRef(E, Base);
}
static RValue GenerateMessageSendSuper(CodeGenFunction &CGF,
ReturnValueSlot Return,
QualType ResultType,
Selector S,
llvm::Value *Receiver,
const CallArgList &CallArgs) {
const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CGF.CurFuncDecl);
bool isClassMessage = OMD->isClassMethod();
bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext());
return CGF.CGM.getObjCRuntime()
.GenerateMessageSendSuper(CGF, Return, ResultType,
S, OMD->getClassInterface(),
isCategoryImpl, Receiver,
isClassMessage, CallArgs);
}
RValue CodeGenFunction::EmitLoadOfPropertyRefLValue(LValue LV,
ReturnValueSlot Return) {
const ObjCPropertyRefExpr *E = LV.getPropertyRefExpr();
QualType ResultType = E->getGetterResultType();
Selector S;
const ObjCMethodDecl *method;
if (E->isExplicitProperty()) {
const ObjCPropertyDecl *Property = E->getExplicitProperty();
S = Property->getGetterName();
method = Property->getGetterMethodDecl();
} else {
method = E->getImplicitPropertyGetter();
S = method->getSelector();
}
llvm::Value *Receiver = LV.getPropertyRefBaseAddr();
if (CGM.getLangOptions().ObjCAutoRefCount) {
QualType receiverType;
if (E->isSuperReceiver())
receiverType = E->getSuperReceiverType();
else if (E->isClassReceiver())
receiverType = getContext().getObjCClassType();
else
receiverType = E->getBase()->getType();
}
// Accesses to 'super' follow a different code path.
if (E->isSuperReceiver())
return AdjustRelatedResultType(*this, E, method,
GenerateMessageSendSuper(*this, Return,
ResultType,
S, Receiver,
CallArgList()));
const ObjCInterfaceDecl *ReceiverClass
= (E->isClassReceiver() ? E->getClassReceiver() : 0);
return AdjustRelatedResultType(*this, E, method,
CGM.getObjCRuntime().
GenerateMessageSend(*this, Return, ResultType, S,
Receiver, CallArgList(), ReceiverClass));
}
void CodeGenFunction::EmitStoreThroughPropertyRefLValue(RValue Src,
LValue Dst) {
const ObjCPropertyRefExpr *E = Dst.getPropertyRefExpr();
Selector S = E->getSetterSelector();
QualType ArgType = E->getSetterArgType();
// FIXME. Other than scalars, AST is not adequate for setter and
// getter type mismatches which require conversion.
if (Src.isScalar()) {
llvm::Value *SrcVal = Src.getScalarVal();
QualType DstType = getContext().getCanonicalType(ArgType);
const llvm::Type *DstTy = ConvertType(DstType);
if (SrcVal->getType() != DstTy)
Src =
RValue::get(EmitScalarConversion(SrcVal, E->getType(), DstType));
}
CallArgList Args;
Args.add(Src, ArgType);
llvm::Value *Receiver = Dst.getPropertyRefBaseAddr();
QualType ResultType = getContext().VoidTy;
if (E->isSuperReceiver()) {
GenerateMessageSendSuper(*this, ReturnValueSlot(),
ResultType, S, Receiver, Args);
return;
}
const ObjCInterfaceDecl *ReceiverClass
= (E->isClassReceiver() ? E->getClassReceiver() : 0);
CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(),
ResultType, S, Receiver, Args,
ReceiverClass);
}
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->setLocation(S.getSourceRange().getBegin());
DI->EmitRegionStart(Builder);
}
// 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");
JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next");
// Fast enumeration state.
QualType StateTy = getContext().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.
llvm::Value *Collection = EmitScalarExpr(S.getCollection());
// 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.
const 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");
// 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);
// 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()),
"tmp");
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().getFunctionInfo(getContext().VoidTy, Args2,
FunctionType::ExtInfo()),
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), D->getType(),
VK_LValue, SourceLocation());
elementLValue = EmitLValue(&tempDRE);
elementType = D->getType();
elementIsVariable = true;
} else {
elementLValue = LValue(); // suppress warning
elementType = cast<Expr>(S.getElement())->getType();
elementIsVariable = false;
}
const 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, elementType);
// 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));
// 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());
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, elementType);
}
if (DI) {
DI->setLocation(S.getSourceRange().getEnd());
DI->EmitRegionEnd(Builder);
}
EmitBlock(LoopEnd.getBlock());
}
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_ObjCProduceObject. Just does a
/// primitive retain.
llvm::Value *CodeGenFunction::EmitObjCProduceObject(QualType type,
llvm::Value *value) {
return EmitARCRetain(type, value);
}
namespace {
struct CallObjCRelease : EHScopeStack::Cleanup {
CallObjCRelease(QualType type, llvm::Value *ptr, llvm::Value *condition)
: type(type), ptr(ptr), condition(condition) {}
QualType type;
llvm::Value *ptr;
llvm::Value *condition;
void Emit(CodeGenFunction &CGF, bool forEH) {
llvm::Value *object;
// If we're in a conditional branch, we had to stash away in an
// alloca the pointer to be released.
llvm::BasicBlock *cont = 0;
if (condition) {
llvm::BasicBlock *release = CGF.createBasicBlock("release.yes");
cont = CGF.createBasicBlock("release.cont");
llvm::Value *cond = CGF.Builder.CreateLoad(condition);
CGF.Builder.CreateCondBr(cond, release, cont);
CGF.EmitBlock(release);
object = CGF.Builder.CreateLoad(ptr);
} else {
object = ptr;
}
CGF.EmitARCRelease(object, /*precise*/ true);
if (cont) CGF.EmitBlock(cont);
}
};
}
/// Produce the code for a CK_ObjCConsumeObject. Does a primitive
/// release at the end of the full-expression.
llvm::Value *CodeGenFunction::EmitObjCConsumeObject(QualType type,
llvm::Value *object) {
// If we're in a conditional branch, we need to make the cleanup
// conditional. FIXME: this really needs to be supported by the
// environment.
llvm::AllocaInst *cond;
llvm::Value *ptr;
if (isInConditionalBranch()) {
cond = CreateTempAlloca(Builder.getInt1Ty(), "release.cond");
ptr = CreateTempAlloca(object->getType(), "release.value");
// The alloca is false until we get here.
// FIXME: er. doesn't this need to be set at the start of the condition?
InitTempAlloca(cond, Builder.getFalse());
// Then it turns true.
Builder.CreateStore(Builder.getTrue(), cond);
Builder.CreateStore(object, ptr);
} else {
cond = 0;
ptr = object;
}
EHStack.pushCleanup<CallObjCRelease>(getARCCleanupKind(), type, ptr, cond);
return object;
}
llvm::Value *CodeGenFunction::EmitObjCExtendObjectLifetime(QualType type,
llvm::Value *value) {
return EmitARCRetainAutorelease(type, value);
}
static llvm::Constant *createARCRuntimeFunction(CodeGenModule &CGM,
const llvm::FunctionType *type,
llvm::StringRef fnName) {
llvm::Constant *fn = CGM.CreateRuntimeFunction(type, fnName);
// In -fobjc-no-arc-runtime, emit weak references to the runtime
// support library.
if (CGM.getLangOptions().ObjCNoAutoRefCountRuntime)
if (llvm::Function *f = dyn_cast<llvm::Function>(fn))
f->setLinkage(llvm::Function::ExternalWeakLinkage);
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,
llvm::StringRef fnName) {
if (isa<llvm::ConstantPointerNull>(value)) return value;
if (!fn) {
std::vector<const llvm::Type*> args(1, CGF.Int8PtrTy);
const llvm::FunctionType *fnType =
llvm::FunctionType::get(CGF.Int8PtrTy, args, false);
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
}
// Cast the argument to 'id'.
const llvm::Type *origType = value->getType();
value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
// Call the function.
llvm::CallInst *call = CGF.Builder.CreateCall(fn, value);
call->setDoesNotThrow();
// 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,
llvm::StringRef fnName) {
if (!fn) {
std::vector<const llvm::Type*> args(1, CGF.Int8PtrPtrTy);
const llvm::FunctionType *fnType =
llvm::FunctionType::get(CGF.Int8PtrTy, args, false);
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
}
// Cast the argument to 'id*'.
const llvm::Type *origType = addr->getType();
addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
// Call the function.
llvm::CallInst *call = CGF.Builder.CreateCall(fn, addr);
call->setDoesNotThrow();
// Cast the result back to a dereference of the original type.
llvm::Value *result = call;
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,
llvm::StringRef fnName,
bool ignored) {
assert(cast<llvm::PointerType>(addr->getType())->getElementType()
== value->getType());
if (!fn) {
std::vector<const llvm::Type*> argTypes(2);
argTypes[0] = CGF.Int8PtrPtrTy;
argTypes[1] = CGF.Int8PtrTy;
const llvm::FunctionType *fnType
= llvm::FunctionType::get(CGF.Int8PtrTy, argTypes, false);
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
}
const llvm::Type *origType = value->getType();
addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
llvm::CallInst *result = CGF.Builder.CreateCall2(fn, addr, value);
result->setDoesNotThrow();
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,
llvm::StringRef fnName) {
assert(dst->getType() == src->getType());
if (!fn) {
std::vector<const llvm::Type*> argTypes(2, CGF.Int8PtrPtrTy);
const llvm::FunctionType *fnType
= llvm::FunctionType::get(CGF.Builder.getVoidTy(), argTypes, false);
fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
}
dst = CGF.Builder.CreateBitCast(dst, CGF.Int8PtrPtrTy);
src = CGF.Builder.CreateBitCast(src, CGF.Int8PtrPtrTy);
llvm::CallInst *result = CGF.Builder.CreateCall2(fn, dst, src);
result->setDoesNotThrow();
}
/// 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);
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)
llvm::Value *CodeGenFunction::EmitARCRetainBlock(llvm::Value *value) {
return emitARCValueOperation(*this, value,
CGM.getARCEntrypoints().objc_retainBlock,
"objc_retainBlock");
}
/// 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) {
llvm::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(llvm::Type::getVoidTy(getLLVMContext()),
/*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);
llvm::Value *args[] = { string };
metadata->addOperand(llvm::MDNode::get(getLLVMContext(), args));
}
}
}
// 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, bool precise) {
if (isa<llvm::ConstantPointerNull>(value)) return;
llvm::Constant *&fn = CGM.getARCEntrypoints().objc_release;
if (!fn) {
std::vector<const llvm::Type*> args(1, Int8PtrTy);
const llvm::FunctionType *fnType =
llvm::FunctionType::get(Builder.getVoidTy(), args, false);
fn = createARCRuntimeFunction(CGM, fnType, "objc_release");
}
// Cast the argument to 'id'.
value = Builder.CreateBitCast(value, Int8PtrTy);
// Call objc_release.
llvm::CallInst *call = Builder.CreateCall(fn, value);
call->setDoesNotThrow();
if (!precise) {
llvm::SmallVector<llvm::Value*,1> args;
call->setMetadata("clang.imprecise_release",
llvm::MDNode::get(Builder.getContext(), args));
}
}
/// 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) {
const llvm::Type *argTypes[] = { Int8PtrPtrTy, Int8PtrTy };
const llvm::FunctionType *fnType
= llvm::FunctionType::get(Builder.getVoidTy(), argTypes, false);
fn = createARCRuntimeFunction(CGM, fnType, "objc_storeStrong");
}
addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
llvm::Value *castValue = Builder.CreateBitCast(value, Int8PtrTy);
Builder.CreateCall2(fn, addr, castValue)->setDoesNotThrow();
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, QualType type,
llvm::Value *newValue,
bool ignored) {
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() && dst.getAlignment() < 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.getAddress(), dst.isVolatileQualified(),
dst.getAlignment(), type, dst.getTBAAInfo());
// Store. We do this before the release so that any deallocs won't
// see the old value.
EmitStoreOfScalar(newValue, dst.getAddress(),
dst.isVolatileQualified(), dst.getAlignment(),
type, dst.getTBAAInfo());
// Finally, release the old value.
EmitARCRelease(oldValue, /*precise*/ false);
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");
}
/// 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");
}
/// 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;
const llvm::Type *origType = value->getType();
value = Builder.CreateBitCast(value, Int8PtrTy);
value = EmitARCRetainBlock(value);
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) {
std::vector<const llvm::Type*> args(1, Int8PtrPtrTy);
const llvm::FunctionType *fnType =
llvm::FunctionType::get(Builder.getVoidTy(), args, false);
fn = createARCRuntimeFunction(CGM, fnType, "objc_destroyWeak");
}
// Cast the argument to 'id*'.
addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
llvm::CallInst *call = Builder.CreateCall(fn, addr);
call->setDoesNotThrow();
}
/// 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) {
const llvm::FunctionType *fnType =
llvm::FunctionType::get(Int8PtrTy, false);
fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPush");
}
llvm::CallInst *call = Builder.CreateCall(fn);
call->setDoesNotThrow();
return call;
}
/// 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) {
std::vector<const llvm::Type*> args(1, Int8PtrTy);
const llvm::FunctionType *fnType =
llvm::FunctionType::get(Builder.getVoidTy(), args, 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");
}
llvm::CallInst *call = Builder.CreateCall(fn, value);
call->setDoesNotThrow();
}
/// 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(Builder);
// [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);
}
namespace {
struct ObjCReleasingCleanup : EHScopeStack::Cleanup {
private:
QualType type;
llvm::Value *addr;
protected:
ObjCReleasingCleanup(QualType type, llvm::Value *addr)
: type(type), addr(addr) {}
virtual llvm::Value *getAddress(CodeGenFunction &CGF,
llvm::Value *addr) {
return addr;
}
virtual void release(CodeGenFunction &CGF,
QualType type,
llvm::Value *addr) = 0;
public:
void Emit(CodeGenFunction &CGF, bool isForEH) {
const ArrayType *arrayType = CGF.getContext().getAsArrayType(type);
llvm::Value *addr = getAddress(CGF, this->addr);
// If we don't have an array type, this is easy.
if (!arrayType)
return release(CGF, type, addr);
llvm::Value *begin = addr;
QualType baseType;
// Otherwise, this is more painful.
llvm::Value *count = emitArrayLength(CGF, arrayType, baseType,
begin);
assert(baseType == CGF.getContext().getBaseElementType(arrayType));
llvm::BasicBlock *incomingBB = CGF.Builder.GetInsertBlock();
// id *cur = begin;
// id *end = begin + count;
llvm::Value *end =
CGF.Builder.CreateInBoundsGEP(begin, count, "array.end");
// loopBB:
llvm::BasicBlock *loopBB = CGF.createBasicBlock("release-loop");
CGF.EmitBlock(loopBB);
llvm::PHINode *cur = CGF.Builder.CreatePHI(begin->getType(), 2, "cur");
cur->addIncoming(begin, incomingBB);
// if (cur == end) goto endBB;
llvm::Value *eq = CGF.Builder.CreateICmpEQ(cur, end, "release-loop.done");
llvm::BasicBlock *bodyBB = CGF.createBasicBlock("release-loop.body");
llvm::BasicBlock *endBB = CGF.createBasicBlock("release-loop.cont");
CGF.Builder.CreateCondBr(eq, endBB, bodyBB);
CGF.EmitBlock(bodyBB);
// Release the value at 'cur'.
release(CGF, baseType, cur);
// ++cur;
// goto loopBB;
llvm::Value *next = CGF.Builder.CreateConstInBoundsGEP1_32(cur, 1);
cur->addIncoming(next, CGF.Builder.GetInsertBlock());
CGF.Builder.CreateBr(loopBB);
// endBB:
CGF.EmitBlock(endBB);
}
private:
/// Computes the length of an array in elements, as well
/// as the base
static llvm::Value *emitArrayLength(CodeGenFunction &CGF,
const ArrayType *origArrayType,
QualType &baseType,
llvm::Value *&addr) {
ASTContext &Ctx = CGF.getContext();
const ArrayType *arrayType = origArrayType;
// If it's a VLA, we have to load the stored size. Note that
// this is the size of the VLA in bytes, not its size in elements.
llvm::Value *vlaSizeInBytes = 0;
if (isa<VariableArrayType>(arrayType)) {
vlaSizeInBytes = CGF.GetVLASize(cast<VariableArrayType>(arrayType));
// Walk into all VLAs. This doesn't require changes to addr,
// which has type T* where T is the first non-VLA element type.
do {
QualType elementType = arrayType->getElementType();
arrayType = Ctx.getAsArrayType(elementType);
// If we only have VLA components, 'addr' requires no adjustment.
if (!arrayType) {
baseType = elementType;
return divideVLASizeByBaseType(CGF, vlaSizeInBytes, baseType);
}
} while (isa<VariableArrayType>(arrayType));
// We get out here only if we find a constant array type
// inside the VLA.
}
// We have some number of constant-length arrays, so addr should
// have LLVM type [M x [N x [...]]]*. Build a GEP that walks
// down to the first element of addr.
llvm::SmallVector<llvm::Value*, 8> gepIndices;
// GEP down to the array type.
llvm::ConstantInt *zero = CGF.Builder.getInt32(0);
gepIndices.push_back(zero);
// It's more efficient to calculate the count from the LLVM
// constant-length arrays than to re-evaluate the array bounds.
uint64_t countFromCLAs = 1;
const llvm::ArrayType *llvmArrayType =
cast<llvm::ArrayType>(
cast<llvm::PointerType>(addr->getType())->getElementType());
while (true) {
assert(isa<ConstantArrayType>(arrayType));
assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue()
== llvmArrayType->getNumElements());
gepIndices.push_back(zero);
countFromCLAs *= llvmArrayType->getNumElements();
llvmArrayType =
dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType());
if (!llvmArrayType) break;
arrayType = Ctx.getAsArrayType(arrayType->getElementType());
assert(arrayType && "LLVM and Clang types are out-of-synch");
}
// Create the actual GEP.
addr = CGF.Builder.CreateInBoundsGEP(addr, gepIndices.begin(),
gepIndices.end(), "array.begin");
baseType = arrayType->getElementType();
// If we had an VLA dimensions, we need to use the captured size.
if (vlaSizeInBytes)
return divideVLASizeByBaseType(CGF, vlaSizeInBytes, baseType);
// Otherwise, use countFromCLAs.
assert(countFromCLAs == (uint64_t)
(Ctx.getTypeSizeInChars(origArrayType).getQuantity() /
Ctx.getTypeSizeInChars(baseType).getQuantity()));
return llvm::ConstantInt::get(CGF.IntPtrTy, countFromCLAs);
}
static llvm::Value *divideVLASizeByBaseType(CodeGenFunction &CGF,
llvm::Value *vlaSizeInBytes,
QualType baseType) {
// Divide the base type size back out of the
CharUnits baseSize = CGF.getContext().getTypeSizeInChars(baseType);
llvm::Value *baseSizeInBytes =
llvm::ConstantInt::get(vlaSizeInBytes->getType(),
baseSize.getQuantity());
return CGF.Builder.CreateUDiv(vlaSizeInBytes, baseSizeInBytes,
"array.vla-count");
}
};
/// A cleanup that calls @objc_release on all the objects to release.
struct CallReleaseForObject : ObjCReleasingCleanup {
bool precise;
CallReleaseForObject(QualType type, llvm::Value *addr, bool precise)
: ObjCReleasingCleanup(type, addr), precise(precise) {}
void release(CodeGenFunction &CGF, QualType type, llvm::Value *addr) {
llvm::Value *ptr = CGF.Builder.CreateLoad(addr, "tmp");
CGF.EmitARCRelease(ptr, precise);
}
};
/// A cleanup that calls @objc_storeStrong(nil) on all the objects to
/// release in an ivar.
struct CallReleaseForIvar : ObjCReleasingCleanup {
const ObjCIvarDecl *ivar;
CallReleaseForIvar(const ObjCIvarDecl *ivar, llvm::Value *self)
: ObjCReleasingCleanup(ivar->getType(), self), ivar(ivar) {}
llvm::Value *getAddress(CodeGenFunction &CGF, llvm::Value *addr) {
LValue lvalue
= CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), addr, ivar, /*CVR*/ 0);
return lvalue.getAddress();
}
void release(CodeGenFunction &CGF, QualType type, llvm::Value *addr) {
// Release ivars by storing nil into them; it just makes things easier.
llvm::Value *null = getNullForVariable(addr);
CGF.EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
}
};
/// A cleanup that calls @objc_release on all of the objects to release in
/// a field.
struct CallReleaseForField : CallReleaseForObject {
const FieldDecl *Field;
explicit CallReleaseForField(const FieldDecl *Field)
: CallReleaseForObject(Field->getType(), 0, /*precise=*/true),
Field(Field) { }
llvm::Value *getAddress(CodeGenFunction &CGF, llvm::Value *) {
llvm::Value *This = CGF.LoadCXXThis();
LValue LV = CGF.EmitLValueForField(This, Field, 0);
return LV.getAddress();
}
};
/// A cleanup that calls @objc_weak_release on all the objects to
/// release in an object.
struct CallWeakReleaseForObject : ObjCReleasingCleanup {
CallWeakReleaseForObject(QualType type, llvm::Value *addr)
: ObjCReleasingCleanup(type, addr) {}
void release(CodeGenFunction &CGF, QualType type, llvm::Value *addr) {
CGF.EmitARCDestroyWeak(addr);
}
};
/// A cleanup that calls @objc_weak_release on all the objects to
/// release in an ivar.
struct CallWeakReleaseForIvar : CallWeakReleaseForObject {
const ObjCIvarDecl *ivar;
CallWeakReleaseForIvar(const ObjCIvarDecl *ivar, llvm::Value *self)
: CallWeakReleaseForObject(ivar->getType(), self), ivar(ivar) {}
llvm::Value *getAddress(CodeGenFunction &CGF, llvm::Value *addr) {
LValue lvalue
= CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), addr, ivar, /*CVR*/ 0);
return lvalue.getAddress();
}
};
/// A cleanup that calls @objc_weak_release on all the objects to
/// release in a field;
struct CallWeakReleaseForField : CallWeakReleaseForObject {
const FieldDecl *Field;
CallWeakReleaseForField(const FieldDecl *Field)
: CallWeakReleaseForObject(Field->getType(), 0), Field(Field) {}
llvm::Value *getAddress(CodeGenFunction &CGF, llvm::Value *) {
llvm::Value *This = CGF.LoadCXXThis();
LValue LV = CGF.EmitLValueForField(This, Field, 0);
return LV.getAddress();
}
};
struct CallObjCAutoreleasePoolObject : EHScopeStack::Cleanup {
llvm::Value *Token;
CallObjCAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
void Emit(CodeGenFunction &CGF, bool isForEH) {
CGF.EmitObjCAutoreleasePoolPop(Token);
}
};
struct CallObjCMRRAutoreleasePoolObject : EHScopeStack::Cleanup {
llvm::Value *Token;
CallObjCMRRAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
void Emit(CodeGenFunction &CGF, bool isForEH) {
CGF.EmitObjCMRRAutoreleasePoolPop(Token);
}
};
}
void CodeGenFunction::EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr) {
if (CGM.getLangOptions().ObjCAutoRefCount)
EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, Ptr);
else
EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, Ptr);
}
/// PushARCReleaseCleanup - Enter a cleanup to perform a release on a
/// given object or array of objects.
void CodeGenFunction::PushARCReleaseCleanup(CleanupKind cleanupKind,
QualType type,
llvm::Value *addr,
bool precise) {
EHStack.pushCleanup<CallReleaseForObject>(cleanupKind, type, addr, precise);
}
/// PushARCWeakReleaseCleanup - Enter a cleanup to perform a weak
/// release on the given object or array of objects.
void CodeGenFunction::PushARCWeakReleaseCleanup(CleanupKind cleanupKind,
QualType type,
llvm::Value *addr) {
EHStack.pushCleanup<CallWeakReleaseForObject>(cleanupKind, type, addr);
}
/// PushARCReleaseCleanup - Enter a cleanup to perform a release on a
/// given object or array of objects.
void CodeGenFunction::PushARCFieldReleaseCleanup(CleanupKind cleanupKind,
const FieldDecl *field) {
EHStack.pushCleanup<CallReleaseForField>(cleanupKind, field);
}
/// PushARCWeakReleaseCleanup - Enter a cleanup to perform a weak
/// release on the given object or array of objects.
void CodeGenFunction::PushARCFieldWeakReleaseCleanup(CleanupKind cleanupKind,
const FieldDecl *field) {
EHStack.pushCleanup<CallWeakReleaseForField>(cleanupKind, field);
}
static void pushReleaseForIvar(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
llvm::Value *self) {
CGF.EHStack.pushCleanup<CallReleaseForIvar>(CGF.getARCCleanupKind(),
ivar, self);
}
static void pushWeakReleaseForIvar(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
llvm::Value *self) {
CGF.EHStack.pushCleanup<CallWeakReleaseForIvar>(CGF.getARCCleanupKind(),
ivar, self);
}
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, type).getScalarVal(),
false);
case Qualifiers::OCL_Weak:
return TryEmitResult(CGF.EmitARCLoadWeakRetained(lvalue.getAddress()),
true);
}
llvm_unreachable("impossible lifetime!");
return TryEmitResult();
}
static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF,
const Expr *e) {
e = e->IgnoreParens();
QualType type = e->getType();
// 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.getLangOptions().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);
}
}
static TryEmitResult
tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e) {
QualType originalType = e->getType();
// The desired result type, if it differs from the type of the
// ultimate opaque expression.
const 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_AnyPointerToObjCPointerCast:
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_ObjCConsumeObject: {
llvm::Value *result = CGF.EmitScalarExpr(ce->getSubExpr());
if (resultType) result = CGF.Builder.CreateBitCast(result, resultType);
return TryEmitResult(result, true);
}
case CK_GetObjCProperty: {
llvm::Value *result = emitARCRetainCall(CGF, ce);
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);
}
// 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) {
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) {
TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
llvm::Value *value = result.getPointer();
if (result.getInt())
value = EmitARCAutorelease(value);
else
value = EmitARCRetainAutorelease(e->getType(), value);
return value;
}
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();
LValue lvalue = EmitLValue(e->getLHS());
// If the RHS was emitted retained, expand this.
if (result.getInt()) {
llvm::Value *oldValue =
EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatileQualified(),
lvalue.getAlignment(), e->getType(),
lvalue.getTBAAInfo());
EmitStoreOfScalar(value, lvalue.getAddress(),
lvalue.isVolatileQualified(), lvalue.getAlignment(),
e->getType(), lvalue.getTBAAInfo());
EmitARCRelease(oldValue, /*precise*/ false);
} else {
value = EmitARCStoreStrong(lvalue, e->getType(), 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.getAddress(),
lvalue.isVolatileQualified(), lvalue.getAlignment(),
e->getType(), lvalue.getTBAAInfo());
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->setLocation(S.getLBracLoc());
DI->EmitRegionStart(Builder);
}
// Keep track of the current cleanup stack depth.
RunCleanupsScope Scope(*this);
const llvm::Triple Triple = getContext().Target.getTriple();
if (CGM.getLangOptions().ObjCAutoRefCount ||
(CGM.isTargetDarwin() &&
((Triple.getArch() == llvm::Triple::x86_64 &&
Triple.getDarwinMajorNumber() >= 11)
|| (Triple.getEnvironmentName() == "iphoneos" &&
Triple.getDarwinMajorNumber() >= 5)))) {
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->setLocation(S.getRBracLoc());
DI->EmitRegionEnd(Builder);
}
}
CGObjCRuntime::~CGObjCRuntime() {}
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