271a272,1046
>
> /// EmitClassAggrMemberwiseCopy - This routine generates code to copy a class
> /// array of objects from SrcValue to DestValue. Copying can be either a bitwise
> /// copy or via a copy constructor call.
> // FIXME. Consolidate this with EmitCXXAggrConstructorCall.
> void CodeGenFunction::EmitClassAggrMemberwiseCopy(llvm::Value *Dest,
> llvm::Value *Src,
> const ArrayType *Array,
> const CXXRecordDecl *BaseClassDecl,
> QualType Ty) {
> const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
> assert(CA && "VLA cannot be copied over");
> bool BitwiseCopy = BaseClassDecl->hasTrivialCopyConstructor();
>
> // Create a temporary for the loop index and initialize it with 0.
> llvm::Value *IndexPtr = CreateTempAlloca(llvm::Type::getInt64Ty(VMContext),
> "loop.index");
> llvm::Value* zeroConstant =
> llvm::Constant::getNullValue(llvm::Type::getInt64Ty(VMContext));
> Builder.CreateStore(zeroConstant, IndexPtr);
> // Start the loop with a block that tests the condition.
> llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
> llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
>
> EmitBlock(CondBlock);
>
> llvm::BasicBlock *ForBody = createBasicBlock("for.body");
> // Generate: if (loop-index < number-of-elements fall to the loop body,
> // otherwise, go to the block after the for-loop.
> uint64_t NumElements = getContext().getConstantArrayElementCount(CA);
> llvm::Value * NumElementsPtr =
> llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), NumElements);
> llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
> llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElementsPtr,
> "isless");
> // If the condition is true, execute the body.
> Builder.CreateCondBr(IsLess, ForBody, AfterFor);
>
> EmitBlock(ForBody);
> llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
> // Inside the loop body, emit the constructor call on the array element.
> Counter = Builder.CreateLoad(IndexPtr);
> Src = Builder.CreateInBoundsGEP(Src, Counter, "srcaddress");
> Dest = Builder.CreateInBoundsGEP(Dest, Counter, "destaddress");
> if (BitwiseCopy)
> EmitAggregateCopy(Dest, Src, Ty);
> else if (CXXConstructorDecl *BaseCopyCtor =
> BaseClassDecl->getCopyConstructor(getContext(), 0)) {
> llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(BaseCopyCtor,
> Ctor_Complete);
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> BaseCopyCtor->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> BaseCopyCtor->getParamDecl(0)->getType()));
> QualType ResultType =
> BaseCopyCtor->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, BaseCopyCtor);
> }
> EmitBlock(ContinueBlock);
>
> // Emit the increment of the loop counter.
> llvm::Value *NextVal = llvm::ConstantInt::get(Counter->getType(), 1);
> Counter = Builder.CreateLoad(IndexPtr);
> NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
> Builder.CreateStore(NextVal, IndexPtr);
>
> // Finally, branch back up to the condition for the next iteration.
> EmitBranch(CondBlock);
>
> // Emit the fall-through block.
> EmitBlock(AfterFor, true);
> }
>
> /// EmitClassAggrCopyAssignment - This routine generates code to assign a class
> /// array of objects from SrcValue to DestValue. Assignment can be either a
> /// bitwise assignment or via a copy assignment operator function call.
> /// FIXME. This can be consolidated with EmitClassAggrMemberwiseCopy
> void CodeGenFunction::EmitClassAggrCopyAssignment(llvm::Value *Dest,
> llvm::Value *Src,
> const ArrayType *Array,
> const CXXRecordDecl *BaseClassDecl,
> QualType Ty) {
> const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
> assert(CA && "VLA cannot be asssigned");
> bool BitwiseAssign = BaseClassDecl->hasTrivialCopyAssignment();
>
> // Create a temporary for the loop index and initialize it with 0.
> llvm::Value *IndexPtr = CreateTempAlloca(llvm::Type::getInt64Ty(VMContext),
> "loop.index");
> llvm::Value* zeroConstant =
> llvm::Constant::getNullValue(llvm::Type::getInt64Ty(VMContext));
> Builder.CreateStore(zeroConstant, IndexPtr);
> // Start the loop with a block that tests the condition.
> llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
> llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
>
> EmitBlock(CondBlock);
>
> llvm::BasicBlock *ForBody = createBasicBlock("for.body");
> // Generate: if (loop-index < number-of-elements fall to the loop body,
> // otherwise, go to the block after the for-loop.
> uint64_t NumElements = getContext().getConstantArrayElementCount(CA);
> llvm::Value * NumElementsPtr =
> llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), NumElements);
> llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
> llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElementsPtr,
> "isless");
> // If the condition is true, execute the body.
> Builder.CreateCondBr(IsLess, ForBody, AfterFor);
>
> EmitBlock(ForBody);
> llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
> // Inside the loop body, emit the assignment operator call on array element.
> Counter = Builder.CreateLoad(IndexPtr);
> Src = Builder.CreateInBoundsGEP(Src, Counter, "srcaddress");
> Dest = Builder.CreateInBoundsGEP(Dest, Counter, "destaddress");
> const CXXMethodDecl *MD = 0;
> if (BitwiseAssign)
> EmitAggregateCopy(Dest, Src, Ty);
> else {
> bool hasCopyAssign = BaseClassDecl->hasConstCopyAssignment(getContext(),
> MD);
> assert(hasCopyAssign && "EmitClassAggrCopyAssignment - No user assign");
> (void)hasCopyAssign;
> const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
> const llvm::Type *LTy =
> CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
> FPT->isVariadic());
> llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, LTy);
>
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> MD->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> MD->getParamDecl(0)->getType()));
> QualType ResultType = MD->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, MD);
> }
> EmitBlock(ContinueBlock);
>
> // Emit the increment of the loop counter.
> llvm::Value *NextVal = llvm::ConstantInt::get(Counter->getType(), 1);
> Counter = Builder.CreateLoad(IndexPtr);
> NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
> Builder.CreateStore(NextVal, IndexPtr);
>
> // Finally, branch back up to the condition for the next iteration.
> EmitBranch(CondBlock);
>
> // Emit the fall-through block.
> EmitBlock(AfterFor, true);
> }
>
> /// EmitClassMemberwiseCopy - This routine generates code to copy a class
> /// object from SrcValue to DestValue. Copying can be either a bitwise copy
> /// or via a copy constructor call.
> void CodeGenFunction::EmitClassMemberwiseCopy(
> llvm::Value *Dest, llvm::Value *Src,
> const CXXRecordDecl *ClassDecl,
> const CXXRecordDecl *BaseClassDecl, QualType Ty) {
> if (ClassDecl) {
> Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> }
> if (BaseClassDecl->hasTrivialCopyConstructor()) {
> EmitAggregateCopy(Dest, Src, Ty);
> return;
> }
>
> if (CXXConstructorDecl *BaseCopyCtor =
> BaseClassDecl->getCopyConstructor(getContext(), 0)) {
> llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(BaseCopyCtor,
> Ctor_Complete);
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> BaseCopyCtor->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> BaseCopyCtor->getParamDecl(0)->getType()));
> QualType ResultType =
> BaseCopyCtor->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, BaseCopyCtor);
> }
> }
>
> /// EmitClassCopyAssignment - This routine generates code to copy assign a class
> /// object from SrcValue to DestValue. Assignment can be either a bitwise
> /// assignment of via an assignment operator call.
> // FIXME. Consolidate this with EmitClassMemberwiseCopy as they share a lot.
> void CodeGenFunction::EmitClassCopyAssignment(
> llvm::Value *Dest, llvm::Value *Src,
> const CXXRecordDecl *ClassDecl,
> const CXXRecordDecl *BaseClassDecl,
> QualType Ty) {
> if (ClassDecl) {
> Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> }
> if (BaseClassDecl->hasTrivialCopyAssignment()) {
> EmitAggregateCopy(Dest, Src, Ty);
> return;
> }
>
> const CXXMethodDecl *MD = 0;
> bool ConstCopyAssignOp = BaseClassDecl->hasConstCopyAssignment(getContext(),
> MD);
> assert(ConstCopyAssignOp && "EmitClassCopyAssignment - missing copy assign");
> (void)ConstCopyAssignOp;
>
> const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
> const llvm::Type *LTy =
> CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
> FPT->isVariadic());
> llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, LTy);
>
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> MD->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> MD->getParamDecl(0)->getType()));
> QualType ResultType =
> MD->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, MD);
> }
>
> /// SynthesizeDefaultConstructor - synthesize a default constructor
> void
> CodeGenFunction::SynthesizeDefaultConstructor(const CXXConstructorDecl *Ctor,
> CXXCtorType Type,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
> assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
> StartFunction(GlobalDecl(Ctor, Type), Ctor->getResultType(), Fn, Args,
> SourceLocation());
> EmitCtorPrologue(Ctor, Type);
> FinishFunction();
> }
>
> /// SynthesizeCXXCopyConstructor - This routine implicitly defines body of a
> /// copy constructor, in accordance with section 12.8 (p7 and p8) of C++03
> /// The implicitly-defined copy constructor for class X performs a memberwise
> /// copy of its subobjects. The order of copying is the same as the order of
> /// initialization of bases and members in a user-defined constructor
> /// Each subobject is copied in the manner appropriate to its type:
> /// if the subobject is of class type, the copy constructor for the class is
> /// used;
> /// if the subobject is an array, each element is copied, in the manner
> /// appropriate to the element type;
> /// if the subobject is of scalar type, the built-in assignment operator is
> /// used.
> /// Virtual base class subobjects shall be copied only once by the
> /// implicitly-defined copy constructor
>
> void
> CodeGenFunction::SynthesizeCXXCopyConstructor(const CXXConstructorDecl *Ctor,
> CXXCtorType Type,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
> const CXXRecordDecl *ClassDecl = Ctor->getParent();
> assert(!ClassDecl->hasUserDeclaredCopyConstructor() &&
> "SynthesizeCXXCopyConstructor - copy constructor has definition already");
> assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
> StartFunction(GlobalDecl(Ctor, Type), Ctor->getResultType(), Fn, Args,
> SourceLocation());
>
> FunctionArgList::const_iterator i = Args.begin();
> const VarDecl *ThisArg = i->first;
> llvm::Value *ThisObj = GetAddrOfLocalVar(ThisArg);
> llvm::Value *LoadOfThis = Builder.CreateLoad(ThisObj, "this");
> const VarDecl *SrcArg = (i+1)->first;
> llvm::Value *SrcObj = GetAddrOfLocalVar(SrcArg);
> llvm::Value *LoadOfSrc = Builder.CreateLoad(SrcObj);
>
> for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
> Base != ClassDecl->bases_end(); ++Base) {
> // FIXME. copy constrution of virtual base NYI
> if (Base->isVirtual())
> continue;
>
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
> EmitClassMemberwiseCopy(LoadOfThis, LoadOfSrc, ClassDecl, BaseClassDecl,
> Base->getType());
> }
>
> for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
> E = ClassDecl->field_end(); I != E; ++I) {
> const FieldDecl *Field = *I;
>
> QualType FieldType = getContext().getCanonicalType(Field->getType());
> const ConstantArrayType *Array =
> getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = getContext().getBaseElementType(FieldType);
>
> if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
> CXXRecordDecl *FieldClassDecl
> = cast<CXXRecordDecl>(FieldClassType->getDecl());
> LValue LHS = EmitLValueForField(LoadOfThis, Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, Field, false, 0);
> if (Array) {
> const llvm::Type *BasePtr = ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *DestBaseAddrPtr =
> Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> llvm::Value *SrcBaseAddrPtr =
> Builder.CreateBitCast(RHS.getAddress(), BasePtr);
> EmitClassAggrMemberwiseCopy(DestBaseAddrPtr, SrcBaseAddrPtr, Array,
> FieldClassDecl, FieldType);
> }
> else
> EmitClassMemberwiseCopy(LHS.getAddress(), RHS.getAddress(),
> 0 /*ClassDecl*/, FieldClassDecl, FieldType);
> continue;
> }
>
> if (Field->getType()->isReferenceType()) {
> unsigned FieldIndex = CGM.getTypes().getLLVMFieldNo(Field);
>
> llvm::Value *LHS = Builder.CreateStructGEP(LoadOfThis, FieldIndex,
> "lhs.ref");
>
> llvm::Value *RHS = Builder.CreateStructGEP(LoadOfThis, FieldIndex,
> "rhs.ref");
>
> // Load the value in RHS.
> RHS = Builder.CreateLoad(RHS);
>
> // And store it in the LHS
> Builder.CreateStore(RHS, LHS);
>
> continue;
> }
> // Do a built-in assignment of scalar data members.
> LValue LHS = EmitLValueForField(LoadOfThis, Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, Field, false, 0);
>
> if (!hasAggregateLLVMType(Field->getType())) {
> RValue RVRHS = EmitLoadOfLValue(RHS, Field->getType());
> EmitStoreThroughLValue(RVRHS, LHS, Field->getType());
> } else if (Field->getType()->isAnyComplexType()) {
> ComplexPairTy Pair = LoadComplexFromAddr(RHS.getAddress(),
> RHS.isVolatileQualified());
> StoreComplexToAddr(Pair, LHS.getAddress(), LHS.isVolatileQualified());
> } else {
> EmitAggregateCopy(LHS.getAddress(), RHS.getAddress(), Field->getType());
> }
> }
>
> InitializeVtablePtrs(ClassDecl);
> FinishFunction();
> }
>
> /// SynthesizeCXXCopyAssignment - Implicitly define copy assignment operator.
> /// Before the implicitly-declared copy assignment operator for a class is
> /// implicitly defined, all implicitly- declared copy assignment operators for
> /// its direct base classes and its nonstatic data members shall have been
> /// implicitly defined. [12.8-p12]
> /// The implicitly-defined copy assignment operator for class X performs
> /// memberwise assignment of its subob- jects. The direct base classes of X are
> /// assigned first, in the order of their declaration in
> /// the base-specifier-list, and then the immediate nonstatic data members of X
> /// are assigned, in the order in which they were declared in the class
> /// definition.Each subobject is assigned in the manner appropriate to its type:
> /// if the subobject is of class type, the copy assignment operator for the
> /// class is used (as if by explicit qualification; that is, ignoring any
> /// possible virtual overriding functions in more derived classes);
> ///
> /// if the subobject is an array, each element is assigned, in the manner
> /// appropriate to the element type;
> ///
> /// if the subobject is of scalar type, the built-in assignment operator is
> /// used.
> void CodeGenFunction::SynthesizeCXXCopyAssignment(const CXXMethodDecl *CD,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
>
> const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(CD->getDeclContext());
> assert(!ClassDecl->hasUserDeclaredCopyAssignment() &&
> "SynthesizeCXXCopyAssignment - copy assignment has user declaration");
> StartFunction(CD, CD->getResultType(), Fn, Args, SourceLocation());
>
> FunctionArgList::const_iterator i = Args.begin();
> const VarDecl *ThisArg = i->first;
> llvm::Value *ThisObj = GetAddrOfLocalVar(ThisArg);
> llvm::Value *LoadOfThis = Builder.CreateLoad(ThisObj, "this");
> const VarDecl *SrcArg = (i+1)->first;
> llvm::Value *SrcObj = GetAddrOfLocalVar(SrcArg);
> llvm::Value *LoadOfSrc = Builder.CreateLoad(SrcObj);
>
> for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
> Base != ClassDecl->bases_end(); ++Base) {
> // FIXME. copy assignment of virtual base NYI
> if (Base->isVirtual())
> continue;
>
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
> EmitClassCopyAssignment(LoadOfThis, LoadOfSrc, ClassDecl, BaseClassDecl,
> Base->getType());
> }
>
> for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
> FieldEnd = ClassDecl->field_end();
> Field != FieldEnd; ++Field) {
> QualType FieldType = getContext().getCanonicalType((*Field)->getType());
> const ConstantArrayType *Array =
> getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = getContext().getBaseElementType(FieldType);
>
> if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
> CXXRecordDecl *FieldClassDecl
> = cast<CXXRecordDecl>(FieldClassType->getDecl());
> LValue LHS = EmitLValueForField(LoadOfThis, *Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, *Field, false, 0);
> if (Array) {
> const llvm::Type *BasePtr = ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *DestBaseAddrPtr =
> Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> llvm::Value *SrcBaseAddrPtr =
> Builder.CreateBitCast(RHS.getAddress(), BasePtr);
> EmitClassAggrCopyAssignment(DestBaseAddrPtr, SrcBaseAddrPtr, Array,
> FieldClassDecl, FieldType);
> }
> else
> EmitClassCopyAssignment(LHS.getAddress(), RHS.getAddress(),
> 0 /*ClassDecl*/, FieldClassDecl, FieldType);
> continue;
> }
> // Do a built-in assignment of scalar data members.
> LValue LHS = EmitLValueForField(LoadOfThis, *Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, *Field, false, 0);
> if (!hasAggregateLLVMType(Field->getType())) {
> RValue RVRHS = EmitLoadOfLValue(RHS, Field->getType());
> EmitStoreThroughLValue(RVRHS, LHS, Field->getType());
> } else if (Field->getType()->isAnyComplexType()) {
> ComplexPairTy Pair = LoadComplexFromAddr(RHS.getAddress(),
> RHS.isVolatileQualified());
> StoreComplexToAddr(Pair, LHS.getAddress(), LHS.isVolatileQualified());
> } else {
> EmitAggregateCopy(LHS.getAddress(), RHS.getAddress(), Field->getType());
> }
> }
>
> // return *this;
> Builder.CreateStore(LoadOfThis, ReturnValue);
>
> FinishFunction();
> }
>
> static void EmitBaseInitializer(CodeGenFunction &CGF,
> const CXXRecordDecl *ClassDecl,
> CXXBaseOrMemberInitializer *BaseInit,
> CXXCtorType CtorType) {
> assert(BaseInit->isBaseInitializer() &&
> "Must have base initializer!");
>
> llvm::Value *ThisPtr = CGF.LoadCXXThis();
>
> const Type *BaseType = BaseInit->getBaseClass();
> CXXRecordDecl *BaseClassDecl =
> cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl());
>
> // FIXME: This method of determining whether a base is virtual is ridiculous;
> // it should be part of BaseInit.
> bool isBaseVirtual = false;
> for (CXXRecordDecl::base_class_const_iterator I = ClassDecl->vbases_begin(),
> E = ClassDecl->vbases_end(); I != E; ++I)
> if (I->getType()->getAs<RecordType>()->getDecl() == BaseClassDecl) {
> isBaseVirtual = true;
> break;
> }
>
> // The base constructor doesn't construct virtual bases.
> if (CtorType == Ctor_Base && isBaseVirtual)
> return;
>
> // Compute the offset to the base; we do this directly instead of using
> // GetAddressOfBaseClass because the class doesn't have a vtable pointer
> // at this point.
> // FIXME: This could be refactored back into GetAddressOfBaseClass if it took
> // an extra parameter for whether the derived class is the complete object
> // class.
> const ASTRecordLayout &Layout =
> CGF.getContext().getASTRecordLayout(ClassDecl);
> uint64_t Offset;
> if (isBaseVirtual)
> Offset = Layout.getVBaseClassOffset(BaseClassDecl);
> else
> Offset = Layout.getBaseClassOffset(BaseClassDecl);
> const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext());
> const llvm::Type *BaseClassType = CGF.ConvertType(QualType(BaseType, 0));
> llvm::Value *V = CGF.Builder.CreateBitCast(ThisPtr, Int8PtrTy);
> V = CGF.Builder.CreateConstInBoundsGEP1_64(V, Offset/8);
> V = CGF.Builder.CreateBitCast(V, BaseClassType->getPointerTo());
>
> // FIXME: This should always use Ctor_Base as the ctor type! (But that
> // causes crashes in tests.)
> CGF.EmitCXXConstructorCall(BaseInit->getConstructor(),
> CtorType, V,
> BaseInit->const_arg_begin(),
> BaseInit->const_arg_end());
> }
>
> static void EmitMemberInitializer(CodeGenFunction &CGF,
> const CXXRecordDecl *ClassDecl,
> CXXBaseOrMemberInitializer *MemberInit) {
> assert(MemberInit->isMemberInitializer() &&
> "Must have member initializer!");
>
> // non-static data member initializers.
> FieldDecl *Field = MemberInit->getMember();
> QualType FieldType = CGF.getContext().getCanonicalType(Field->getType());
>
> llvm::Value *ThisPtr = CGF.LoadCXXThis();
> LValue LHS;
> if (FieldType->isReferenceType()) {
> // FIXME: This is really ugly; should be refactored somehow
> unsigned idx = CGF.CGM.getTypes().getLLVMFieldNo(Field);
> llvm::Value *V = CGF.Builder.CreateStructGEP(ThisPtr, idx, "tmp");
> assert(!FieldType.getObjCGCAttr() && "fields cannot have GC attrs");
> LHS = LValue::MakeAddr(V, CGF.MakeQualifiers(FieldType));
> } else {
> LHS = CGF.EmitLValueForField(ThisPtr, Field, ClassDecl->isUnion(), 0);
> }
>
> // If we are initializing an anonymous union field, drill down to the field.
> if (MemberInit->getAnonUnionMember()) {
> Field = MemberInit->getAnonUnionMember();
> LHS = CGF.EmitLValueForField(LHS.getAddress(), Field,
> /*IsUnion=*/true, 0);
> FieldType = Field->getType();
> }
>
> // If the field is an array, branch based on the element type.
> const ConstantArrayType *Array =
> CGF.getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = CGF.getContext().getBaseElementType(FieldType);
>
> // We lose the constructor for anonymous union members, so handle them
> // explicitly.
> // FIXME: This is somwhat ugly.
> if (MemberInit->getAnonUnionMember() && FieldType->getAs<RecordType>()) {
> if (MemberInit->getNumArgs())
> CGF.EmitAggExpr(*MemberInit->arg_begin(), LHS.getAddress(),
> LHS.isVolatileQualified());
> else
> CGF.EmitAggregateClear(LHS.getAddress(), Field->getType());
> return;
> }
>
> if (FieldType->getAs<RecordType>()) {
> assert(MemberInit->getConstructor() &&
> "EmitCtorPrologue - no constructor to initialize member");
> if (Array) {
> const llvm::Type *BasePtr = CGF.ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *BaseAddrPtr =
> CGF.Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> CGF.EmitCXXAggrConstructorCall(MemberInit->getConstructor(),
> Array, BaseAddrPtr,
> MemberInit->const_arg_begin(),
> MemberInit->const_arg_end());
> }
> else
> CGF.EmitCXXConstructorCall(MemberInit->getConstructor(),
> Ctor_Complete, LHS.getAddress(),
> MemberInit->const_arg_begin(),
> MemberInit->const_arg_end());
> return;
> }
>
> assert(MemberInit->getNumArgs() == 1 && "Initializer count must be 1 only");
> Expr *RhsExpr = *MemberInit->arg_begin();
> RValue RHS;
> if (FieldType->isReferenceType()) {
> RHS = CGF.EmitReferenceBindingToExpr(RhsExpr, FieldType,
> /*IsInitializer=*/true);
> CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
> } else if (Array) {
> CGF.EmitMemSetToZero(LHS.getAddress(), Field->getType());
> } else if (!CGF.hasAggregateLLVMType(RhsExpr->getType())) {
> RHS = RValue::get(CGF.EmitScalarExpr(RhsExpr, true));
> CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
> } else if (RhsExpr->getType()->isAnyComplexType()) {
> CGF.EmitComplexExprIntoAddr(RhsExpr, LHS.getAddress(),
> LHS.isVolatileQualified());
> } else {
> // Handle member function pointers; other aggregates shouldn't get this far.
> CGF.EmitAggExpr(RhsExpr, LHS.getAddress(), LHS.isVolatileQualified());
> }
> }
>
> /// EmitCtorPrologue - This routine generates necessary code to initialize
> /// base classes and non-static data members belonging to this constructor.
> /// FIXME: This needs to take a CXXCtorType.
> void CodeGenFunction::EmitCtorPrologue(const CXXConstructorDecl *CD,
> CXXCtorType CtorType) {
> const CXXRecordDecl *ClassDecl = CD->getParent();
>
> // FIXME: Add vbase initialization
>
> for (CXXConstructorDecl::init_const_iterator B = CD->init_begin(),
> E = CD->init_end();
> B != E; ++B) {
> CXXBaseOrMemberInitializer *Member = (*B);
>
> assert(LiveTemporaries.empty() &&
> "Should not have any live temporaries at initializer start!");
>
> if (Member->isBaseInitializer())
> EmitBaseInitializer(*this, ClassDecl, Member, CtorType);
> else
> EmitMemberInitializer(*this, ClassDecl, Member);
>
> // Pop any live temporaries that the initializers might have pushed.
> while (!LiveTemporaries.empty())
> PopCXXTemporary();
> }
>
> InitializeVtablePtrs(ClassDecl);
> }
>
> /// EmitDtorEpilogue - Emit all code that comes at the end of class's
> /// destructor. This is to call destructors on members and base classes
> /// in reverse order of their construction.
> /// FIXME: This needs to take a CXXDtorType.
> void CodeGenFunction::EmitDtorEpilogue(const CXXDestructorDecl *DD,
> CXXDtorType DtorType) {
> assert(!DD->isTrivial() &&
> "Should not emit dtor epilogue for trivial dtor!");
>
> const CXXRecordDecl *ClassDecl = DD->getParent();
>
> // Collect the fields.
> llvm::SmallVector<const FieldDecl *, 16> FieldDecls;
> for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
> E = ClassDecl->field_end(); I != E; ++I) {
> const FieldDecl *Field = *I;
>
> QualType FieldType = getContext().getCanonicalType(Field->getType());
> FieldType = getContext().getBaseElementType(FieldType);
>
> const RecordType *RT = FieldType->getAs<RecordType>();
> if (!RT)
> continue;
>
> CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
> if (FieldClassDecl->hasTrivialDestructor())
> continue;
>
> FieldDecls.push_back(Field);
> }
>
> // Now destroy the fields.
> for (size_t i = FieldDecls.size(); i > 0; --i) {
> const FieldDecl *Field = FieldDecls[i - 1];
>
> QualType FieldType = Field->getType();
> const ConstantArrayType *Array =
> getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = getContext().getBaseElementType(FieldType);
>
> const RecordType *RT = FieldType->getAs<RecordType>();
> CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
>
> llvm::Value *ThisPtr = LoadCXXThis();
>
> LValue LHS = EmitLValueForField(ThisPtr, Field,
> /*isUnion=*/false,
> // FIXME: Qualifiers?
> /*CVRQualifiers=*/0);
> if (Array) {
> const llvm::Type *BasePtr = ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *BaseAddrPtr =
> Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> EmitCXXAggrDestructorCall(FieldClassDecl->getDestructor(getContext()),
> Array, BaseAddrPtr);
> } else
> EmitCXXDestructorCall(FieldClassDecl->getDestructor(getContext()),
> Dtor_Complete, LHS.getAddress());
> }
>
> // Destroy non-virtual bases.
> for (CXXRecordDecl::reverse_base_class_const_iterator I =
> ClassDecl->bases_rbegin(), E = ClassDecl->bases_rend(); I != E; ++I) {
> const CXXBaseSpecifier &Base = *I;
>
> // Ignore virtual bases.
> if (Base.isVirtual())
> continue;
>
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
>
> // Ignore trivial destructors.
> if (BaseClassDecl->hasTrivialDestructor())
> continue;
> const CXXDestructorDecl *D = BaseClassDecl->getDestructor(getContext());
>
> llvm::Value *V = GetAddressOfBaseClass(LoadCXXThis(),
> ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> EmitCXXDestructorCall(D, Dtor_Base, V);
> }
>
> // If we're emitting a base destructor, we don't want to emit calls to the
> // virtual bases.
> if (DtorType == Dtor_Base)
> return;
>
> // Handle virtual bases.
> for (CXXRecordDecl::reverse_base_class_const_iterator I =
> ClassDecl->vbases_rbegin(), E = ClassDecl->vbases_rend(); I != E; ++I) {
> const CXXBaseSpecifier &Base = *I;
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
>
> // Ignore trivial destructors.
> if (BaseClassDecl->hasTrivialDestructor())
> continue;
> const CXXDestructorDecl *D = BaseClassDecl->getDestructor(getContext());
> llvm::Value *V = GetAddressOfBaseClass(LoadCXXThis(),
> ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> EmitCXXDestructorCall(D, Dtor_Base, V);
> }
>
> // If we have a deleting destructor, emit a call to the delete operator.
> if (DtorType == Dtor_Deleting) {
> assert(DD->getOperatorDelete() &&
> "operator delete missing - EmitDtorEpilogue");
> EmitDeleteCall(DD->getOperatorDelete(), LoadCXXThis(),
> getContext().getTagDeclType(ClassDecl));
> }
> }
>
> void CodeGenFunction::SynthesizeDefaultDestructor(const CXXDestructorDecl *Dtor,
> CXXDtorType DtorType,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
> assert(!Dtor->getParent()->hasUserDeclaredDestructor() &&
> "SynthesizeDefaultDestructor - destructor has user declaration");
>
> StartFunction(GlobalDecl(Dtor, DtorType), Dtor->getResultType(), Fn, Args,
> SourceLocation());
>
> EmitDtorEpilogue(Dtor, DtorType);
> FinishFunction();
> }
>
> /// EmitClassAggrMemberwiseCopy - This routine generates code to copy a class
> /// array of objects from SrcValue to DestValue. Copying can be either a bitwise
> /// copy or via a copy constructor call.
> // FIXME. Consolidate this with EmitCXXAggrConstructorCall.
> void CodeGenFunction::EmitClassAggrMemberwiseCopy(llvm::Value *Dest,
> llvm::Value *Src,
> const ArrayType *Array,
> const CXXRecordDecl *BaseClassDecl,
> QualType Ty) {
> const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
> assert(CA && "VLA cannot be copied over");
> bool BitwiseCopy = BaseClassDecl->hasTrivialCopyConstructor();
>
> // Create a temporary for the loop index and initialize it with 0.
> llvm::Value *IndexPtr = CreateTempAlloca(llvm::Type::getInt64Ty(VMContext),
> "loop.index");
> llvm::Value* zeroConstant =
> llvm::Constant::getNullValue(llvm::Type::getInt64Ty(VMContext));
> Builder.CreateStore(zeroConstant, IndexPtr);
> // Start the loop with a block that tests the condition.
> llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
> llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
>
> EmitBlock(CondBlock);
>
> llvm::BasicBlock *ForBody = createBasicBlock("for.body");
> // Generate: if (loop-index < number-of-elements fall to the loop body,
> // otherwise, go to the block after the for-loop.
> uint64_t NumElements = getContext().getConstantArrayElementCount(CA);
> llvm::Value * NumElementsPtr =
> llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), NumElements);
> llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
> llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElementsPtr,
> "isless");
> // If the condition is true, execute the body.
> Builder.CreateCondBr(IsLess, ForBody, AfterFor);
>
> EmitBlock(ForBody);
> llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
> // Inside the loop body, emit the constructor call on the array element.
> Counter = Builder.CreateLoad(IndexPtr);
> Src = Builder.CreateInBoundsGEP(Src, Counter, "srcaddress");
> Dest = Builder.CreateInBoundsGEP(Dest, Counter, "destaddress");
> if (BitwiseCopy)
> EmitAggregateCopy(Dest, Src, Ty);
> else if (CXXConstructorDecl *BaseCopyCtor =
> BaseClassDecl->getCopyConstructor(getContext(), 0)) {
> llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(BaseCopyCtor,
> Ctor_Complete);
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> BaseCopyCtor->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> BaseCopyCtor->getParamDecl(0)->getType()));
> QualType ResultType =
> BaseCopyCtor->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, BaseCopyCtor);
> }
> EmitBlock(ContinueBlock);
>
> // Emit the increment of the loop counter.
> llvm::Value *NextVal = llvm::ConstantInt::get(Counter->getType(), 1);
> Counter = Builder.CreateLoad(IndexPtr);
> NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
> Builder.CreateStore(NextVal, IndexPtr);
>
> // Finally, branch back up to the condition for the next iteration.
> EmitBranch(CondBlock);
>
> // Emit the fall-through block.
> EmitBlock(AfterFor, true);
> }
>
> /// EmitClassAggrCopyAssignment - This routine generates code to assign a class
> /// array of objects from SrcValue to DestValue. Assignment can be either a
> /// bitwise assignment or via a copy assignment operator function call.
> /// FIXME. This can be consolidated with EmitClassAggrMemberwiseCopy
> void CodeGenFunction::EmitClassAggrCopyAssignment(llvm::Value *Dest,
> llvm::Value *Src,
> const ArrayType *Array,
> const CXXRecordDecl *BaseClassDecl,
> QualType Ty) {
> const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array);
> assert(CA && "VLA cannot be asssigned");
> bool BitwiseAssign = BaseClassDecl->hasTrivialCopyAssignment();
>
> // Create a temporary for the loop index and initialize it with 0.
> llvm::Value *IndexPtr = CreateTempAlloca(llvm::Type::getInt64Ty(VMContext),
> "loop.index");
> llvm::Value* zeroConstant =
> llvm::Constant::getNullValue(llvm::Type::getInt64Ty(VMContext));
> Builder.CreateStore(zeroConstant, IndexPtr);
> // Start the loop with a block that tests the condition.
> llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
> llvm::BasicBlock *AfterFor = createBasicBlock("for.end");
>
> EmitBlock(CondBlock);
>
> llvm::BasicBlock *ForBody = createBasicBlock("for.body");
> // Generate: if (loop-index < number-of-elements fall to the loop body,
> // otherwise, go to the block after the for-loop.
> uint64_t NumElements = getContext().getConstantArrayElementCount(CA);
> llvm::Value * NumElementsPtr =
> llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), NumElements);
> llvm::Value *Counter = Builder.CreateLoad(IndexPtr);
> llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElementsPtr,
> "isless");
> // If the condition is true, execute the body.
> Builder.CreateCondBr(IsLess, ForBody, AfterFor);
>
> EmitBlock(ForBody);
> llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc");
> // Inside the loop body, emit the assignment operator call on array element.
> Counter = Builder.CreateLoad(IndexPtr);
> Src = Builder.CreateInBoundsGEP(Src, Counter, "srcaddress");
> Dest = Builder.CreateInBoundsGEP(Dest, Counter, "destaddress");
> const CXXMethodDecl *MD = 0;
> if (BitwiseAssign)
> EmitAggregateCopy(Dest, Src, Ty);
> else {
> bool hasCopyAssign = BaseClassDecl->hasConstCopyAssignment(getContext(),
> MD);
> assert(hasCopyAssign && "EmitClassAggrCopyAssignment - No user assign");
> (void)hasCopyAssign;
> const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
> const llvm::Type *LTy =
> CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
> FPT->isVariadic());
> llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, LTy);
>
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> MD->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> MD->getParamDecl(0)->getType()));
> QualType ResultType = MD->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, MD);
> }
> EmitBlock(ContinueBlock);
>
> // Emit the increment of the loop counter.
> llvm::Value *NextVal = llvm::ConstantInt::get(Counter->getType(), 1);
> Counter = Builder.CreateLoad(IndexPtr);
> NextVal = Builder.CreateAdd(Counter, NextVal, "inc");
> Builder.CreateStore(NextVal, IndexPtr);
>
> // Finally, branch back up to the condition for the next iteration.
> EmitBranch(CondBlock);
>
> // Emit the fall-through block.
> EmitBlock(AfterFor, true);
> }
>
> /// EmitClassMemberwiseCopy - This routine generates code to copy a class
> /// object from SrcValue to DestValue. Copying can be either a bitwise copy
> /// or via a copy constructor call.
> void CodeGenFunction::EmitClassMemberwiseCopy(
> llvm::Value *Dest, llvm::Value *Src,
> const CXXRecordDecl *ClassDecl,
> const CXXRecordDecl *BaseClassDecl, QualType Ty) {
> if (ClassDecl) {
> Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> }
> if (BaseClassDecl->hasTrivialCopyConstructor()) {
> EmitAggregateCopy(Dest, Src, Ty);
> return;
> }
>
> if (CXXConstructorDecl *BaseCopyCtor =
> BaseClassDecl->getCopyConstructor(getContext(), 0)) {
> llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(BaseCopyCtor,
> Ctor_Complete);
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> BaseCopyCtor->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> BaseCopyCtor->getParamDecl(0)->getType()));
> QualType ResultType =
> BaseCopyCtor->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, BaseCopyCtor);
> }
> }
>
> /// EmitClassCopyAssignment - This routine generates code to copy assign a class
> /// object from SrcValue to DestValue. Assignment can be either a bitwise
> /// assignment of via an assignment operator call.
> // FIXME. Consolidate this with EmitClassMemberwiseCopy as they share a lot.
> void CodeGenFunction::EmitClassCopyAssignment(
> llvm::Value *Dest, llvm::Value *Src,
> const CXXRecordDecl *ClassDecl,
> const CXXRecordDecl *BaseClassDecl,
> QualType Ty) {
> if (ClassDecl) {
> Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> }
> if (BaseClassDecl->hasTrivialCopyAssignment()) {
> EmitAggregateCopy(Dest, Src, Ty);
> return;
> }
>
> const CXXMethodDecl *MD = 0;
> bool ConstCopyAssignOp = BaseClassDecl->hasConstCopyAssignment(getContext(),
> MD);
> assert(ConstCopyAssignOp && "EmitClassCopyAssignment - missing copy assign");
> (void)ConstCopyAssignOp;
>
> const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
> const llvm::Type *LTy =
> CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
> FPT->isVariadic());
> llvm::Constant *Callee = CGM.GetAddrOfFunction(MD, LTy);
>
> CallArgList CallArgs;
> // Push the this (Dest) ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Dest),
> MD->getThisType(getContext())));
>
> // Push the Src ptr.
> CallArgs.push_back(std::make_pair(RValue::get(Src),
> MD->getParamDecl(0)->getType()));
> QualType ResultType =
> MD->getType()->getAs<FunctionType>()->getResultType();
> EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
> Callee, ReturnValueSlot(), CallArgs, MD);
> }
>
> /// SynthesizeDefaultConstructor - synthesize a default constructor
> void
> CodeGenFunction::SynthesizeDefaultConstructor(const CXXConstructorDecl *Ctor,
> CXXCtorType Type,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
> assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
> StartFunction(GlobalDecl(Ctor, Type), Ctor->getResultType(), Fn, Args,
> SourceLocation());
> EmitCtorPrologue(Ctor, Type);
> FinishFunction();
> }
>
> /// SynthesizeCXXCopyConstructor - This routine implicitly defines body of a
> /// copy constructor, in accordance with section 12.8 (p7 and p8) of C++03
> /// The implicitly-defined copy constructor for class X performs a memberwise
> /// copy of its subobjects. The order of copying is the same as the order of
> /// initialization of bases and members in a user-defined constructor
> /// Each subobject is copied in the manner appropriate to its type:
> /// if the subobject is of class type, the copy constructor for the class is
> /// used;
> /// if the subobject is an array, each element is copied, in the manner
> /// appropriate to the element type;
> /// if the subobject is of scalar type, the built-in assignment operator is
> /// used.
> /// Virtual base class subobjects shall be copied only once by the
> /// implicitly-defined copy constructor
>
> void
> CodeGenFunction::SynthesizeCXXCopyConstructor(const CXXConstructorDecl *Ctor,
> CXXCtorType Type,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
> const CXXRecordDecl *ClassDecl = Ctor->getParent();
> assert(!ClassDecl->hasUserDeclaredCopyConstructor() &&
> "SynthesizeCXXCopyConstructor - copy constructor has definition already");
> assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor");
> StartFunction(GlobalDecl(Ctor, Type), Ctor->getResultType(), Fn, Args,
> SourceLocation());
>
> FunctionArgList::const_iterator i = Args.begin();
> const VarDecl *ThisArg = i->first;
> llvm::Value *ThisObj = GetAddrOfLocalVar(ThisArg);
> llvm::Value *LoadOfThis = Builder.CreateLoad(ThisObj, "this");
> const VarDecl *SrcArg = (i+1)->first;
> llvm::Value *SrcObj = GetAddrOfLocalVar(SrcArg);
> llvm::Value *LoadOfSrc = Builder.CreateLoad(SrcObj);
>
> for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
> Base != ClassDecl->bases_end(); ++Base) {
> // FIXME. copy constrution of virtual base NYI
> if (Base->isVirtual())
> continue;
>
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
> EmitClassMemberwiseCopy(LoadOfThis, LoadOfSrc, ClassDecl, BaseClassDecl,
> Base->getType());
> }
>
> for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
> E = ClassDecl->field_end(); I != E; ++I) {
> const FieldDecl *Field = *I;
>
> QualType FieldType = getContext().getCanonicalType(Field->getType());
> const ConstantArrayType *Array =
> getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = getContext().getBaseElementType(FieldType);
>
> if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
> CXXRecordDecl *FieldClassDecl
> = cast<CXXRecordDecl>(FieldClassType->getDecl());
> LValue LHS = EmitLValueForField(LoadOfThis, Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, Field, false, 0);
> if (Array) {
> const llvm::Type *BasePtr = ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *DestBaseAddrPtr =
> Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> llvm::Value *SrcBaseAddrPtr =
> Builder.CreateBitCast(RHS.getAddress(), BasePtr);
> EmitClassAggrMemberwiseCopy(DestBaseAddrPtr, SrcBaseAddrPtr, Array,
> FieldClassDecl, FieldType);
> }
> else
> EmitClassMemberwiseCopy(LHS.getAddress(), RHS.getAddress(),
> 0 /*ClassDecl*/, FieldClassDecl, FieldType);
> continue;
> }
>
> if (Field->getType()->isReferenceType()) {
> unsigned FieldIndex = CGM.getTypes().getLLVMFieldNo(Field);
>
> llvm::Value *LHS = Builder.CreateStructGEP(LoadOfThis, FieldIndex,
> "lhs.ref");
>
> llvm::Value *RHS = Builder.CreateStructGEP(LoadOfThis, FieldIndex,
> "rhs.ref");
>
> // Load the value in RHS.
> RHS = Builder.CreateLoad(RHS);
>
> // And store it in the LHS
> Builder.CreateStore(RHS, LHS);
>
> continue;
> }
> // Do a built-in assignment of scalar data members.
> LValue LHS = EmitLValueForField(LoadOfThis, Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, Field, false, 0);
>
> if (!hasAggregateLLVMType(Field->getType())) {
> RValue RVRHS = EmitLoadOfLValue(RHS, Field->getType());
> EmitStoreThroughLValue(RVRHS, LHS, Field->getType());
> } else if (Field->getType()->isAnyComplexType()) {
> ComplexPairTy Pair = LoadComplexFromAddr(RHS.getAddress(),
> RHS.isVolatileQualified());
> StoreComplexToAddr(Pair, LHS.getAddress(), LHS.isVolatileQualified());
> } else {
> EmitAggregateCopy(LHS.getAddress(), RHS.getAddress(), Field->getType());
> }
> }
>
> InitializeVtablePtrs(ClassDecl);
> FinishFunction();
> }
>
> /// SynthesizeCXXCopyAssignment - Implicitly define copy assignment operator.
> /// Before the implicitly-declared copy assignment operator for a class is
> /// implicitly defined, all implicitly- declared copy assignment operators for
> /// its direct base classes and its nonstatic data members shall have been
> /// implicitly defined. [12.8-p12]
> /// The implicitly-defined copy assignment operator for class X performs
> /// memberwise assignment of its subob- jects. The direct base classes of X are
> /// assigned first, in the order of their declaration in
> /// the base-specifier-list, and then the immediate nonstatic data members of X
> /// are assigned, in the order in which they were declared in the class
> /// definition.Each subobject is assigned in the manner appropriate to its type:
> /// if the subobject is of class type, the copy assignment operator for the
> /// class is used (as if by explicit qualification; that is, ignoring any
> /// possible virtual overriding functions in more derived classes);
> ///
> /// if the subobject is an array, each element is assigned, in the manner
> /// appropriate to the element type;
> ///
> /// if the subobject is of scalar type, the built-in assignment operator is
> /// used.
> void CodeGenFunction::SynthesizeCXXCopyAssignment(const CXXMethodDecl *CD,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
>
> const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(CD->getDeclContext());
> assert(!ClassDecl->hasUserDeclaredCopyAssignment() &&
> "SynthesizeCXXCopyAssignment - copy assignment has user declaration");
> StartFunction(CD, CD->getResultType(), Fn, Args, SourceLocation());
>
> FunctionArgList::const_iterator i = Args.begin();
> const VarDecl *ThisArg = i->first;
> llvm::Value *ThisObj = GetAddrOfLocalVar(ThisArg);
> llvm::Value *LoadOfThis = Builder.CreateLoad(ThisObj, "this");
> const VarDecl *SrcArg = (i+1)->first;
> llvm::Value *SrcObj = GetAddrOfLocalVar(SrcArg);
> llvm::Value *LoadOfSrc = Builder.CreateLoad(SrcObj);
>
> for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
> Base != ClassDecl->bases_end(); ++Base) {
> // FIXME. copy assignment of virtual base NYI
> if (Base->isVirtual())
> continue;
>
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
> EmitClassCopyAssignment(LoadOfThis, LoadOfSrc, ClassDecl, BaseClassDecl,
> Base->getType());
> }
>
> for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
> FieldEnd = ClassDecl->field_end();
> Field != FieldEnd; ++Field) {
> QualType FieldType = getContext().getCanonicalType((*Field)->getType());
> const ConstantArrayType *Array =
> getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = getContext().getBaseElementType(FieldType);
>
> if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
> CXXRecordDecl *FieldClassDecl
> = cast<CXXRecordDecl>(FieldClassType->getDecl());
> LValue LHS = EmitLValueForField(LoadOfThis, *Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, *Field, false, 0);
> if (Array) {
> const llvm::Type *BasePtr = ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *DestBaseAddrPtr =
> Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> llvm::Value *SrcBaseAddrPtr =
> Builder.CreateBitCast(RHS.getAddress(), BasePtr);
> EmitClassAggrCopyAssignment(DestBaseAddrPtr, SrcBaseAddrPtr, Array,
> FieldClassDecl, FieldType);
> }
> else
> EmitClassCopyAssignment(LHS.getAddress(), RHS.getAddress(),
> 0 /*ClassDecl*/, FieldClassDecl, FieldType);
> continue;
> }
> // Do a built-in assignment of scalar data members.
> LValue LHS = EmitLValueForField(LoadOfThis, *Field, false, 0);
> LValue RHS = EmitLValueForField(LoadOfSrc, *Field, false, 0);
> if (!hasAggregateLLVMType(Field->getType())) {
> RValue RVRHS = EmitLoadOfLValue(RHS, Field->getType());
> EmitStoreThroughLValue(RVRHS, LHS, Field->getType());
> } else if (Field->getType()->isAnyComplexType()) {
> ComplexPairTy Pair = LoadComplexFromAddr(RHS.getAddress(),
> RHS.isVolatileQualified());
> StoreComplexToAddr(Pair, LHS.getAddress(), LHS.isVolatileQualified());
> } else {
> EmitAggregateCopy(LHS.getAddress(), RHS.getAddress(), Field->getType());
> }
> }
>
> // return *this;
> Builder.CreateStore(LoadOfThis, ReturnValue);
>
> FinishFunction();
> }
>
> static void EmitBaseInitializer(CodeGenFunction &CGF,
> const CXXRecordDecl *ClassDecl,
> CXXBaseOrMemberInitializer *BaseInit,
> CXXCtorType CtorType) {
> assert(BaseInit->isBaseInitializer() &&
> "Must have base initializer!");
>
> llvm::Value *ThisPtr = CGF.LoadCXXThis();
>
> const Type *BaseType = BaseInit->getBaseClass();
> CXXRecordDecl *BaseClassDecl =
> cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl());
>
> // FIXME: This method of determining whether a base is virtual is ridiculous;
> // it should be part of BaseInit.
> bool isBaseVirtual = false;
> for (CXXRecordDecl::base_class_const_iterator I = ClassDecl->vbases_begin(),
> E = ClassDecl->vbases_end(); I != E; ++I)
> if (I->getType()->getAs<RecordType>()->getDecl() == BaseClassDecl) {
> isBaseVirtual = true;
> break;
> }
>
> // The base constructor doesn't construct virtual bases.
> if (CtorType == Ctor_Base && isBaseVirtual)
> return;
>
> // Compute the offset to the base; we do this directly instead of using
> // GetAddressOfBaseClass because the class doesn't have a vtable pointer
> // at this point.
> // FIXME: This could be refactored back into GetAddressOfBaseClass if it took
> // an extra parameter for whether the derived class is the complete object
> // class.
> const ASTRecordLayout &Layout =
> CGF.getContext().getASTRecordLayout(ClassDecl);
> uint64_t Offset;
> if (isBaseVirtual)
> Offset = Layout.getVBaseClassOffset(BaseClassDecl);
> else
> Offset = Layout.getBaseClassOffset(BaseClassDecl);
> const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext());
> const llvm::Type *BaseClassType = CGF.ConvertType(QualType(BaseType, 0));
> llvm::Value *V = CGF.Builder.CreateBitCast(ThisPtr, Int8PtrTy);
> V = CGF.Builder.CreateConstInBoundsGEP1_64(V, Offset/8);
> V = CGF.Builder.CreateBitCast(V, BaseClassType->getPointerTo());
>
> // FIXME: This should always use Ctor_Base as the ctor type! (But that
> // causes crashes in tests.)
> CGF.EmitCXXConstructorCall(BaseInit->getConstructor(),
> CtorType, V,
> BaseInit->const_arg_begin(),
> BaseInit->const_arg_end());
> }
>
> static void EmitMemberInitializer(CodeGenFunction &CGF,
> const CXXRecordDecl *ClassDecl,
> CXXBaseOrMemberInitializer *MemberInit) {
> assert(MemberInit->isMemberInitializer() &&
> "Must have member initializer!");
>
> // non-static data member initializers.
> FieldDecl *Field = MemberInit->getMember();
> QualType FieldType = CGF.getContext().getCanonicalType(Field->getType());
>
> llvm::Value *ThisPtr = CGF.LoadCXXThis();
> LValue LHS;
> if (FieldType->isReferenceType()) {
> // FIXME: This is really ugly; should be refactored somehow
> unsigned idx = CGF.CGM.getTypes().getLLVMFieldNo(Field);
> llvm::Value *V = CGF.Builder.CreateStructGEP(ThisPtr, idx, "tmp");
> assert(!FieldType.getObjCGCAttr() && "fields cannot have GC attrs");
> LHS = LValue::MakeAddr(V, CGF.MakeQualifiers(FieldType));
> } else {
> LHS = CGF.EmitLValueForField(ThisPtr, Field, ClassDecl->isUnion(), 0);
> }
>
> // If we are initializing an anonymous union field, drill down to the field.
> if (MemberInit->getAnonUnionMember()) {
> Field = MemberInit->getAnonUnionMember();
> LHS = CGF.EmitLValueForField(LHS.getAddress(), Field,
> /*IsUnion=*/true, 0);
> FieldType = Field->getType();
> }
>
> // If the field is an array, branch based on the element type.
> const ConstantArrayType *Array =
> CGF.getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = CGF.getContext().getBaseElementType(FieldType);
>
> // We lose the constructor for anonymous union members, so handle them
> // explicitly.
> // FIXME: This is somwhat ugly.
> if (MemberInit->getAnonUnionMember() && FieldType->getAs<RecordType>()) {
> if (MemberInit->getNumArgs())
> CGF.EmitAggExpr(*MemberInit->arg_begin(), LHS.getAddress(),
> LHS.isVolatileQualified());
> else
> CGF.EmitAggregateClear(LHS.getAddress(), Field->getType());
> return;
> }
>
> if (FieldType->getAs<RecordType>()) {
> assert(MemberInit->getConstructor() &&
> "EmitCtorPrologue - no constructor to initialize member");
> if (Array) {
> const llvm::Type *BasePtr = CGF.ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *BaseAddrPtr =
> CGF.Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> CGF.EmitCXXAggrConstructorCall(MemberInit->getConstructor(),
> Array, BaseAddrPtr,
> MemberInit->const_arg_begin(),
> MemberInit->const_arg_end());
> }
> else
> CGF.EmitCXXConstructorCall(MemberInit->getConstructor(),
> Ctor_Complete, LHS.getAddress(),
> MemberInit->const_arg_begin(),
> MemberInit->const_arg_end());
> return;
> }
>
> assert(MemberInit->getNumArgs() == 1 && "Initializer count must be 1 only");
> Expr *RhsExpr = *MemberInit->arg_begin();
> RValue RHS;
> if (FieldType->isReferenceType()) {
> RHS = CGF.EmitReferenceBindingToExpr(RhsExpr, FieldType,
> /*IsInitializer=*/true);
> CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
> } else if (Array) {
> CGF.EmitMemSetToZero(LHS.getAddress(), Field->getType());
> } else if (!CGF.hasAggregateLLVMType(RhsExpr->getType())) {
> RHS = RValue::get(CGF.EmitScalarExpr(RhsExpr, true));
> CGF.EmitStoreThroughLValue(RHS, LHS, FieldType);
> } else if (RhsExpr->getType()->isAnyComplexType()) {
> CGF.EmitComplexExprIntoAddr(RhsExpr, LHS.getAddress(),
> LHS.isVolatileQualified());
> } else {
> // Handle member function pointers; other aggregates shouldn't get this far.
> CGF.EmitAggExpr(RhsExpr, LHS.getAddress(), LHS.isVolatileQualified());
> }
> }
>
> /// EmitCtorPrologue - This routine generates necessary code to initialize
> /// base classes and non-static data members belonging to this constructor.
> /// FIXME: This needs to take a CXXCtorType.
> void CodeGenFunction::EmitCtorPrologue(const CXXConstructorDecl *CD,
> CXXCtorType CtorType) {
> const CXXRecordDecl *ClassDecl = CD->getParent();
>
> // FIXME: Add vbase initialization
>
> for (CXXConstructorDecl::init_const_iterator B = CD->init_begin(),
> E = CD->init_end();
> B != E; ++B) {
> CXXBaseOrMemberInitializer *Member = (*B);
>
> assert(LiveTemporaries.empty() &&
> "Should not have any live temporaries at initializer start!");
>
> if (Member->isBaseInitializer())
> EmitBaseInitializer(*this, ClassDecl, Member, CtorType);
> else
> EmitMemberInitializer(*this, ClassDecl, Member);
>
> // Pop any live temporaries that the initializers might have pushed.
> while (!LiveTemporaries.empty())
> PopCXXTemporary();
> }
>
> InitializeVtablePtrs(ClassDecl);
> }
>
> /// EmitDtorEpilogue - Emit all code that comes at the end of class's
> /// destructor. This is to call destructors on members and base classes
> /// in reverse order of their construction.
> /// FIXME: This needs to take a CXXDtorType.
> void CodeGenFunction::EmitDtorEpilogue(const CXXDestructorDecl *DD,
> CXXDtorType DtorType) {
> assert(!DD->isTrivial() &&
> "Should not emit dtor epilogue for trivial dtor!");
>
> const CXXRecordDecl *ClassDecl = DD->getParent();
>
> // Collect the fields.
> llvm::SmallVector<const FieldDecl *, 16> FieldDecls;
> for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
> E = ClassDecl->field_end(); I != E; ++I) {
> const FieldDecl *Field = *I;
>
> QualType FieldType = getContext().getCanonicalType(Field->getType());
> FieldType = getContext().getBaseElementType(FieldType);
>
> const RecordType *RT = FieldType->getAs<RecordType>();
> if (!RT)
> continue;
>
> CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
> if (FieldClassDecl->hasTrivialDestructor())
> continue;
>
> FieldDecls.push_back(Field);
> }
>
> // Now destroy the fields.
> for (size_t i = FieldDecls.size(); i > 0; --i) {
> const FieldDecl *Field = FieldDecls[i - 1];
>
> QualType FieldType = Field->getType();
> const ConstantArrayType *Array =
> getContext().getAsConstantArrayType(FieldType);
> if (Array)
> FieldType = getContext().getBaseElementType(FieldType);
>
> const RecordType *RT = FieldType->getAs<RecordType>();
> CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
>
> llvm::Value *ThisPtr = LoadCXXThis();
>
> LValue LHS = EmitLValueForField(ThisPtr, Field,
> /*isUnion=*/false,
> // FIXME: Qualifiers?
> /*CVRQualifiers=*/0);
> if (Array) {
> const llvm::Type *BasePtr = ConvertType(FieldType);
> BasePtr = llvm::PointerType::getUnqual(BasePtr);
> llvm::Value *BaseAddrPtr =
> Builder.CreateBitCast(LHS.getAddress(), BasePtr);
> EmitCXXAggrDestructorCall(FieldClassDecl->getDestructor(getContext()),
> Array, BaseAddrPtr);
> } else
> EmitCXXDestructorCall(FieldClassDecl->getDestructor(getContext()),
> Dtor_Complete, LHS.getAddress());
> }
>
> // Destroy non-virtual bases.
> for (CXXRecordDecl::reverse_base_class_const_iterator I =
> ClassDecl->bases_rbegin(), E = ClassDecl->bases_rend(); I != E; ++I) {
> const CXXBaseSpecifier &Base = *I;
>
> // Ignore virtual bases.
> if (Base.isVirtual())
> continue;
>
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
>
> // Ignore trivial destructors.
> if (BaseClassDecl->hasTrivialDestructor())
> continue;
> const CXXDestructorDecl *D = BaseClassDecl->getDestructor(getContext());
>
> llvm::Value *V = GetAddressOfBaseClass(LoadCXXThis(),
> ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> EmitCXXDestructorCall(D, Dtor_Base, V);
> }
>
> // If we're emitting a base destructor, we don't want to emit calls to the
> // virtual bases.
> if (DtorType == Dtor_Base)
> return;
>
> // Handle virtual bases.
> for (CXXRecordDecl::reverse_base_class_const_iterator I =
> ClassDecl->vbases_rbegin(), E = ClassDecl->vbases_rend(); I != E; ++I) {
> const CXXBaseSpecifier &Base = *I;
> CXXRecordDecl *BaseClassDecl
> = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
>
> // Ignore trivial destructors.
> if (BaseClassDecl->hasTrivialDestructor())
> continue;
> const CXXDestructorDecl *D = BaseClassDecl->getDestructor(getContext());
> llvm::Value *V = GetAddressOfBaseClass(LoadCXXThis(),
> ClassDecl, BaseClassDecl,
> /*NullCheckValue=*/false);
> EmitCXXDestructorCall(D, Dtor_Base, V);
> }
>
> // If we have a deleting destructor, emit a call to the delete operator.
> if (DtorType == Dtor_Deleting) {
> assert(DD->getOperatorDelete() &&
> "operator delete missing - EmitDtorEpilogue");
> EmitDeleteCall(DD->getOperatorDelete(), LoadCXXThis(),
> getContext().getTagDeclType(ClassDecl));
> }
> }
>
> void CodeGenFunction::SynthesizeDefaultDestructor(const CXXDestructorDecl *Dtor,
> CXXDtorType DtorType,
> llvm::Function *Fn,
> const FunctionArgList &Args) {
> assert(!Dtor->getParent()->hasUserDeclaredDestructor() &&
> "SynthesizeDefaultDestructor - destructor has user declaration");
>
> StartFunction(GlobalDecl(Dtor, DtorType), Dtor->getResultType(), Fn, Args,
> SourceLocation());
>
> EmitDtorEpilogue(Dtor, DtorType);
> FinishFunction();
> }