| //===--- CGClass.cpp - Emit LLVM Code for C++ classes ---------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This contains code dealing with C++ code generation of classes |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CodeGenFunction.h" |
| #include "clang/AST/CXXInheritance.h" |
| #include "clang/AST/RecordLayout.h" |
| #include "clang/AST/StmtCXX.h" |
| |
| using namespace clang; |
| using namespace CodeGen; |
| |
| static uint64_t |
| ComputeNonVirtualBaseClassOffset(ASTContext &Context, |
| const CXXRecordDecl *DerivedClass, |
| CXXBaseSpecifierArray::iterator Start, |
| CXXBaseSpecifierArray::iterator End) { |
| uint64_t Offset = 0; |
| |
| const CXXRecordDecl *RD = DerivedClass; |
| |
| for (CXXBaseSpecifierArray::iterator I = Start; I != End; ++I) { |
| const CXXBaseSpecifier *Base = *I; |
| assert(!Base->isVirtual() && "Should not see virtual bases here!"); |
| |
| // Get the layout. |
| const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); |
| |
| const CXXRecordDecl *BaseDecl = |
| cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); |
| |
| // Add the offset. |
| Offset += Layout.getBaseClassOffset(BaseDecl); |
| |
| RD = BaseDecl; |
| } |
| |
| // FIXME: We should not use / 8 here. |
| return Offset / 8; |
| } |
| |
| static uint64_t |
| ComputeNonVirtualBaseClassOffset(ASTContext &Context, |
| const CXXBasePath &Path, |
| unsigned Start) { |
| uint64_t Offset = 0; |
| |
| for (unsigned i = Start, e = Path.size(); i != e; ++i) { |
| const CXXBasePathElement& Element = Path[i]; |
| |
| // Get the layout. |
| const ASTRecordLayout &Layout = Context.getASTRecordLayout(Element.Class); |
| |
| const CXXBaseSpecifier *BS = Element.Base; |
| assert(!BS->isVirtual() && "Should not see virtual bases here!"); |
| |
| const CXXRecordDecl *Base = |
| cast<CXXRecordDecl>(BS->getType()->getAs<RecordType>()->getDecl()); |
| |
| // Add the offset. |
| Offset += Layout.getBaseClassOffset(Base) / 8; |
| } |
| |
| return Offset; |
| } |
| |
| llvm::Constant * |
| CodeGenModule::GetNonVirtualBaseClassOffset(const CXXRecordDecl *Class, |
| const CXXRecordDecl *BaseClass) { |
| if (Class == BaseClass) |
| return 0; |
| |
| CXXBasePaths Paths(/*FindAmbiguities=*/false, |
| /*RecordPaths=*/true, /*DetectVirtual=*/false); |
| if (!const_cast<CXXRecordDecl *>(Class)-> |
| isDerivedFrom(const_cast<CXXRecordDecl *>(BaseClass), Paths)) { |
| assert(false && "Class must be derived from the passed in base class!"); |
| return 0; |
| } |
| |
| uint64_t Offset = ComputeNonVirtualBaseClassOffset(getContext(), |
| Paths.front(), 0); |
| if (!Offset) |
| return 0; |
| |
| const llvm::Type *PtrDiffTy = |
| Types.ConvertType(getContext().getPointerDiffType()); |
| |
| return llvm::ConstantInt::get(PtrDiffTy, Offset); |
| } |
| |
| /// Gets the address of a virtual base class within a complete object. |
| /// This should only be used for (1) non-virtual bases or (2) virtual bases |
| /// when the type is known to be complete (e.g. in complete destructors). |
| /// |
| /// The object pointed to by 'This' is assumed to be non-null. |
| llvm::Value * |
| CodeGenFunction::GetAddressOfBaseOfCompleteClass(llvm::Value *This, |
| bool isBaseVirtual, |
| const CXXRecordDecl *Derived, |
| const CXXRecordDecl *Base) { |
| // 'this' must be a pointer (in some address space) to Derived. |
| assert(This->getType()->isPointerTy() && |
| cast<llvm::PointerType>(This->getType())->getElementType() |
| == ConvertType(Derived)); |
| |
| // Compute the offset of the virtual base. |
| uint64_t Offset; |
| const ASTRecordLayout &Layout = getContext().getASTRecordLayout(Derived); |
| if (isBaseVirtual) |
| Offset = Layout.getVBaseClassOffset(Base); |
| else |
| Offset = Layout.getBaseClassOffset(Base); |
| |
| // Shift and cast down to the base type. |
| // TODO: for complete types, this should be possible with a GEP. |
| llvm::Value *V = This; |
| if (Offset) { |
| const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext()); |
| V = Builder.CreateBitCast(V, Int8PtrTy); |
| V = Builder.CreateConstInBoundsGEP1_64(V, Offset / 8); |
| } |
| V = Builder.CreateBitCast(V, ConvertType(Base)->getPointerTo()); |
| |
| return V; |
| } |
| |
| static llvm::Value * |
| ApplyNonVirtualAndVirtualOffset(CodeGenFunction &CGF, llvm::Value *ThisPtr, |
| uint64_t NonVirtual, llvm::Value *Virtual) { |
| const llvm::Type *PtrDiffTy = |
| CGF.ConvertType(CGF.getContext().getPointerDiffType()); |
| |
| llvm::Value *NonVirtualOffset = 0; |
| if (NonVirtual) |
| NonVirtualOffset = llvm::ConstantInt::get(PtrDiffTy, NonVirtual); |
| |
| llvm::Value *BaseOffset; |
| if (Virtual) { |
| if (NonVirtualOffset) |
| BaseOffset = CGF.Builder.CreateAdd(Virtual, NonVirtualOffset); |
| else |
| BaseOffset = Virtual; |
| } else |
| BaseOffset = NonVirtualOffset; |
| |
| // Apply the base offset. |
| const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| ThisPtr = CGF.Builder.CreateBitCast(ThisPtr, Int8PtrTy); |
| ThisPtr = CGF.Builder.CreateGEP(ThisPtr, BaseOffset, "add.ptr"); |
| |
| return ThisPtr; |
| } |
| |
| llvm::Value * |
| CodeGenFunction::GetAddressOfBaseClass(llvm::Value *Value, |
| const CXXRecordDecl *ClassDecl, |
| const CXXBaseSpecifierArray &BasePath, |
| bool NullCheckValue) { |
| assert(!BasePath.empty() && "Base path should not be empty!"); |
| |
| CXXBaseSpecifierArray::iterator Start = BasePath.begin(); |
| const CXXRecordDecl *VBase = 0; |
| |
| // Get the virtual base. |
| if ((*Start)->isVirtual()) { |
| VBase = |
| cast<CXXRecordDecl>((*Start)->getType()->getAs<RecordType>()->getDecl()); |
| ++Start; |
| } |
| |
| uint64_t NonVirtualOffset = |
| ComputeNonVirtualBaseClassOffset(getContext(), VBase ? VBase : ClassDecl, |
| Start, BasePath.end()); |
| |
| // Get the base pointer type. |
| const llvm::Type *BasePtrTy = |
| ConvertType((BasePath.end()[-1])->getType())->getPointerTo(); |
| |
| if (!NonVirtualOffset && !VBase) { |
| // Just cast back. |
| return Builder.CreateBitCast(Value, BasePtrTy); |
| } |
| |
| llvm::BasicBlock *CastNull = 0; |
| llvm::BasicBlock *CastNotNull = 0; |
| llvm::BasicBlock *CastEnd = 0; |
| |
| if (NullCheckValue) { |
| CastNull = createBasicBlock("cast.null"); |
| CastNotNull = createBasicBlock("cast.notnull"); |
| CastEnd = createBasicBlock("cast.end"); |
| |
| llvm::Value *IsNull = |
| Builder.CreateICmpEQ(Value, |
| llvm::Constant::getNullValue(Value->getType())); |
| Builder.CreateCondBr(IsNull, CastNull, CastNotNull); |
| EmitBlock(CastNotNull); |
| } |
| |
| llvm::Value *VirtualOffset = 0; |
| |
| if (VBase) |
| VirtualOffset = GetVirtualBaseClassOffset(Value, ClassDecl, VBase); |
| |
| // Apply the offsets. |
| Value = ApplyNonVirtualAndVirtualOffset(*this, Value, NonVirtualOffset, |
| VirtualOffset); |
| |
| // Cast back. |
| Value = Builder.CreateBitCast(Value, BasePtrTy); |
| |
| if (NullCheckValue) { |
| Builder.CreateBr(CastEnd); |
| EmitBlock(CastNull); |
| Builder.CreateBr(CastEnd); |
| EmitBlock(CastEnd); |
| |
| llvm::PHINode *PHI = Builder.CreatePHI(Value->getType()); |
| PHI->reserveOperandSpace(2); |
| PHI->addIncoming(Value, CastNotNull); |
| PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()), |
| CastNull); |
| Value = PHI; |
| } |
| |
| return Value; |
| } |
| |
| llvm::Value * |
| CodeGenFunction::GetAddressOfBaseClass(llvm::Value *Value, |
| const CXXRecordDecl *Class, |
| const CXXRecordDecl *BaseClass, |
| bool NullCheckValue) { |
| QualType BTy = |
| getContext().getCanonicalType( |
| getContext().getTypeDeclType(BaseClass)); |
| const llvm::Type *BasePtrTy = llvm::PointerType::getUnqual(ConvertType(BTy)); |
| |
| if (Class == BaseClass) { |
| // Just cast back. |
| return Builder.CreateBitCast(Value, BasePtrTy); |
| } |
| |
| #ifndef NDEBUG |
| CXXBasePaths Paths(/*FindAmbiguities=*/true, |
| /*RecordPaths=*/true, /*DetectVirtual=*/false); |
| #else |
| CXXBasePaths Paths(/*FindAmbiguities=*/false, |
| /*RecordPaths=*/true, /*DetectVirtual=*/false); |
| #endif |
| if (!const_cast<CXXRecordDecl *>(Class)-> |
| isDerivedFrom(const_cast<CXXRecordDecl *>(BaseClass), Paths)) { |
| assert(false && "Class must be derived from the passed in base class!"); |
| return 0; |
| } |
| |
| #if 0 |
| // FIXME: Re-enable this assert when the underlying bugs have been fixed. |
| assert(!Paths.isAmbiguous(BTy) && "Path is ambiguous"); |
| #endif |
| |
| unsigned Start = 0; |
| |
| const CXXBasePath &Path = Paths.front(); |
| const CXXRecordDecl *VBase = 0; |
| for (unsigned i = 0, e = Path.size(); i != e; ++i) { |
| const CXXBasePathElement& Element = Path[i]; |
| if (Element.Base->isVirtual()) { |
| Start = i+1; |
| QualType VBaseType = Element.Base->getType(); |
| VBase = cast<CXXRecordDecl>(VBaseType->getAs<RecordType>()->getDecl()); |
| } |
| } |
| |
| uint64_t Offset = |
| ComputeNonVirtualBaseClassOffset(getContext(), Paths.front(), Start); |
| |
| if (!Offset && !VBase) { |
| // Just cast back. |
| return Builder.CreateBitCast(Value, BasePtrTy); |
| } |
| |
| llvm::BasicBlock *CastNull = 0; |
| llvm::BasicBlock *CastNotNull = 0; |
| llvm::BasicBlock *CastEnd = 0; |
| |
| if (NullCheckValue) { |
| CastNull = createBasicBlock("cast.null"); |
| CastNotNull = createBasicBlock("cast.notnull"); |
| CastEnd = createBasicBlock("cast.end"); |
| |
| llvm::Value *IsNull = |
| Builder.CreateICmpEQ(Value, |
| llvm::Constant::getNullValue(Value->getType())); |
| Builder.CreateCondBr(IsNull, CastNull, CastNotNull); |
| EmitBlock(CastNotNull); |
| } |
| |
| llvm::Value *VirtualOffset = 0; |
| |
| if (VBase) |
| VirtualOffset = GetVirtualBaseClassOffset(Value, Class, VBase); |
| |
| // Apply the offsets. |
| Value = ApplyNonVirtualAndVirtualOffset(*this, Value, Offset, VirtualOffset); |
| |
| // Cast back. |
| Value = Builder.CreateBitCast(Value, BasePtrTy); |
| |
| if (NullCheckValue) { |
| Builder.CreateBr(CastEnd); |
| EmitBlock(CastNull); |
| Builder.CreateBr(CastEnd); |
| EmitBlock(CastEnd); |
| |
| llvm::PHINode *PHI = Builder.CreatePHI(Value->getType()); |
| PHI->reserveOperandSpace(2); |
| PHI->addIncoming(Value, CastNotNull); |
| PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()), |
| CastNull); |
| Value = PHI; |
| } |
| |
| return Value; |
| } |
| |
| llvm::Value * |
| CodeGenFunction::GetAddressOfDerivedClass(llvm::Value *Value, |
| const CXXRecordDecl *Class, |
| const CXXRecordDecl *DerivedClass, |
| bool NullCheckValue) { |
| QualType DerivedTy = |
| getContext().getCanonicalType( |
| getContext().getTypeDeclType(const_cast<CXXRecordDecl*>(DerivedClass))); |
| const llvm::Type *DerivedPtrTy = ConvertType(DerivedTy)->getPointerTo(); |
| |
| if (Class == DerivedClass) { |
| // Just cast back. |
| return Builder.CreateBitCast(Value, DerivedPtrTy); |
| } |
| |
| llvm::Value *NonVirtualOffset = |
| CGM.GetNonVirtualBaseClassOffset(DerivedClass, Class); |
| |
| if (!NonVirtualOffset) { |
| // No offset, we can just cast back. |
| return Builder.CreateBitCast(Value, DerivedPtrTy); |
| } |
| |
| llvm::BasicBlock *CastNull = 0; |
| llvm::BasicBlock *CastNotNull = 0; |
| llvm::BasicBlock *CastEnd = 0; |
| |
| if (NullCheckValue) { |
| CastNull = createBasicBlock("cast.null"); |
| CastNotNull = createBasicBlock("cast.notnull"); |
| CastEnd = createBasicBlock("cast.end"); |
| |
| llvm::Value *IsNull = |
| Builder.CreateICmpEQ(Value, |
| llvm::Constant::getNullValue(Value->getType())); |
| Builder.CreateCondBr(IsNull, CastNull, CastNotNull); |
| EmitBlock(CastNotNull); |
| } |
| |
| // Apply the offset. |
| Value = Builder.CreatePtrToInt(Value, NonVirtualOffset->getType()); |
| Value = Builder.CreateSub(Value, NonVirtualOffset); |
| Value = Builder.CreateIntToPtr(Value, DerivedPtrTy); |
| |
| // Just cast. |
| Value = Builder.CreateBitCast(Value, DerivedPtrTy); |
| |
| if (NullCheckValue) { |
| Builder.CreateBr(CastEnd); |
| EmitBlock(CastNull); |
| Builder.CreateBr(CastEnd); |
| EmitBlock(CastEnd); |
| |
| llvm::PHINode *PHI = Builder.CreatePHI(Value->getType()); |
| PHI->reserveOperandSpace(2); |
| PHI->addIncoming(Value, CastNotNull); |
| PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()), |
| CastNull); |
| Value = PHI; |
| } |
| |
| return Value; |
| } |
| |
| /// EmitCopyCtorCall - Emit a call to a copy constructor. |
| static void |
| EmitCopyCtorCall(CodeGenFunction &CGF, |
| const CXXConstructorDecl *CopyCtor, CXXCtorType CopyCtorType, |
| llvm::Value *ThisPtr, llvm::Value *VTT, llvm::Value *Src) { |
| llvm::Value *Callee = CGF.CGM.GetAddrOfCXXConstructor(CopyCtor, CopyCtorType); |
| |
| CallArgList CallArgs; |
| |
| // Push the this ptr. |
| CallArgs.push_back(std::make_pair(RValue::get(ThisPtr), |
| CopyCtor->getThisType(CGF.getContext()))); |
| |
| // Push the VTT parameter if necessary. |
| if (VTT) { |
| QualType T = CGF.getContext().getPointerType(CGF.getContext().VoidPtrTy); |
| CallArgs.push_back(std::make_pair(RValue::get(VTT), T)); |
| } |
| |
| // Push the Src ptr. |
| CallArgs.push_back(std::make_pair(RValue::get(Src), |
| CopyCtor->getParamDecl(0)->getType())); |
| |
| |
| { |
| CodeGenFunction::CXXTemporariesCleanupScope Scope(CGF); |
| |
| // If the copy constructor has default arguments, emit them. |
| for (unsigned I = 1, E = CopyCtor->getNumParams(); I < E; ++I) { |
| const ParmVarDecl *Param = CopyCtor->getParamDecl(I); |
| const Expr *DefaultArgExpr = Param->getDefaultArg(); |
| |
| assert(DefaultArgExpr && "Ctor parameter must have default arg!"); |
| |
| QualType ArgType = Param->getType(); |
| CallArgs.push_back(std::make_pair(CGF.EmitCallArg(DefaultArgExpr, |
| ArgType), |
| ArgType)); |
| } |
| |
| const FunctionProtoType *FPT = |
| CopyCtor->getType()->getAs<FunctionProtoType>(); |
| CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(CallArgs, FPT), |
| Callee, ReturnValueSlot(), CallArgs, CopyCtor); |
| } |
| } |
| |
| /// 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)) |
| EmitCopyCtorCall(*this, BaseCopyCtor, Ctor_Complete, Dest, 0, Src); |
| |
| 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 { |
| BaseClassDecl->hasConstCopyAssignment(getContext(), MD); |
| assert(MD && "EmitClassAggrCopyAssignment - No user assign"); |
| 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. |
| QualType SrcTy = MD->getParamDecl(0)->getType(); |
| RValue SrcValue = SrcTy->isReferenceType() ? RValue::get(Src) : |
| RValue::getAggregate(Src); |
| CallArgs.push_back(std::make_pair(SrcValue, SrcTy)); |
| EmitCall(CGM.getTypes().getFunctionInfo(CallArgs, FPT), |
| 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); |
| } |
| |
| /// GetVTTParameter - Return the VTT parameter that should be passed to a |
| /// base constructor/destructor with virtual bases. |
| static llvm::Value *GetVTTParameter(CodeGenFunction &CGF, GlobalDecl GD) { |
| if (!CodeGenVTables::needsVTTParameter(GD)) { |
| // This constructor/destructor does not need a VTT parameter. |
| return 0; |
| } |
| |
| const CXXRecordDecl *RD = cast<CXXMethodDecl>(CGF.CurFuncDecl)->getParent(); |
| const CXXRecordDecl *Base = cast<CXXMethodDecl>(GD.getDecl())->getParent(); |
| |
| llvm::Value *VTT; |
| |
| uint64_t SubVTTIndex; |
| |
| // If the record matches the base, this is the complete ctor/dtor |
| // variant calling the base variant in a class with virtual bases. |
| if (RD == Base) { |
| assert(!CodeGenVTables::needsVTTParameter(CGF.CurGD) && |
| "doing no-op VTT offset in base dtor/ctor?"); |
| SubVTTIndex = 0; |
| } else { |
| SubVTTIndex = CGF.CGM.getVTables().getSubVTTIndex(RD, Base); |
| assert(SubVTTIndex != 0 && "Sub-VTT index must be greater than zero!"); |
| } |
| |
| if (CodeGenVTables::needsVTTParameter(CGF.CurGD)) { |
| // A VTT parameter was passed to the constructor, use it. |
| VTT = CGF.LoadCXXVTT(); |
| VTT = CGF.Builder.CreateConstInBoundsGEP1_64(VTT, SubVTTIndex); |
| } else { |
| // We're the complete constructor, so get the VTT by name. |
| VTT = CGF.CGM.getVTables().getVTT(RD); |
| VTT = CGF.Builder.CreateConstInBoundsGEP2_64(VTT, 0, SubVTTIndex); |
| } |
| |
| return VTT; |
| } |
| |
| |
| /// 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) { |
| CXXCtorType CtorType = Ctor_Complete; |
| |
| if (ClassDecl) { |
| Dest = GetAddressOfBaseClass(Dest, ClassDecl, BaseClassDecl, |
| /*NullCheckValue=*/false); |
| Src = GetAddressOfBaseClass(Src, ClassDecl, BaseClassDecl, |
| /*NullCheckValue=*/false); |
| |
| // We want to call the base constructor. |
| CtorType = Ctor_Base; |
| } |
| if (BaseClassDecl->hasTrivialCopyConstructor()) { |
| EmitAggregateCopy(Dest, Src, Ty); |
| return; |
| } |
| |
| CXXConstructorDecl *BaseCopyCtor = |
| BaseClassDecl->getCopyConstructor(getContext(), 0); |
| if (!BaseCopyCtor) |
| return; |
| |
| llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(BaseCopyCtor, CtorType)); |
| EmitCopyCtorCall(*this, BaseCopyCtor, CtorType, Dest, VTT, Src); |
| } |
| |
| /// 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; |
| BaseClassDecl->hasConstCopyAssignment(getContext(), MD); |
| assert(MD && "EmitClassCopyAssignment - missing copy assign"); |
| |
| 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. |
| QualType SrcTy = MD->getParamDecl(0)->getType(); |
| RValue SrcValue = SrcTy->isReferenceType() ? RValue::get(Src) : |
| RValue::getAggregate(Src); |
| CallArgs.push_back(std::make_pair(SrcValue, SrcTy)); |
| EmitCall(CGM.getTypes().getFunctionInfo(CallArgs, FPT), |
| Callee, ReturnValueSlot(), CallArgs, MD); |
| } |
| |
| /// 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 FunctionArgList &Args) { |
| const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(CurGD.getDecl()); |
| const CXXRecordDecl *ClassDecl = Ctor->getParent(); |
| assert(!ClassDecl->hasUserDeclaredCopyConstructor() && |
| "SynthesizeCXXCopyConstructor - copy constructor has definition already"); |
| assert(!Ctor->isTrivial() && "shouldn't need to generate trivial ctor"); |
| |
| 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, 0); |
| LValue RHS = EmitLValueForField(LoadOfSrc, Field, 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; |
| } |
| |
| // Do a built-in assignment of scalar data members. |
| LValue LHS = EmitLValueForFieldInitialization(LoadOfThis, Field, 0); |
| LValue RHS = EmitLValueForFieldInitialization(LoadOfSrc, Field, 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()); |
| } |
| } |
| |
| InitializeVTablePointers(ClassDecl); |
| } |
| |
| /// 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 FunctionArgList &Args) { |
| const CXXMethodDecl *CD = cast<CXXMethodDecl>(CurGD.getDecl()); |
| const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(CD->getDeclContext()); |
| assert(!ClassDecl->hasUserDeclaredCopyAssignment() && |
| "SynthesizeCXXCopyAssignment - copy assignment has user declaration"); |
| |
| 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, 0); |
| LValue RHS = EmitLValueForField(LoadOfSrc, *Field, 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, 0); |
| LValue RHS = EmitLValueForField(LoadOfSrc, *Field, 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); |
| } |
| |
| 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()); |
| |
| bool isBaseVirtual = BaseInit->isBaseVirtual(); |
| |
| // The base constructor doesn't construct virtual bases. |
| if (CtorType == Ctor_Base && isBaseVirtual) |
| return; |
| |
| // We can pretend to be a complete class because it only matters for |
| // virtual bases, and we only do virtual bases for complete ctors. |
| llvm::Value *V = ThisPtr; |
| V = CGF.GetAddressOfBaseOfCompleteClass(V, isBaseVirtual, |
| ClassDecl, BaseClassDecl); |
| |
| CGF.EmitAggExpr(BaseInit->getInit(), V, false, false, true); |
| |
| if (CGF.Exceptions && !BaseClassDecl->hasTrivialDestructor()) { |
| // FIXME: Is this OK for C++0x delegating constructors? |
| CodeGenFunction::EHCleanupBlock Cleanup(CGF); |
| |
| CXXDestructorDecl *DD = BaseClassDecl->getDestructor(CGF.getContext()); |
| CGF.EmitCXXDestructorCall(DD, Dtor_Base, V); |
| } |
| } |
| |
| 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 = CGF.EmitLValueForFieldInitialization(ThisPtr, Field, 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, 0); |
| FieldType = Field->getType(); |
| } |
| |
| // FIXME: If there's no initializer and the CXXBaseOrMemberInitializer |
| // was implicitly generated, we shouldn't be zeroing memory. |
| RValue RHS; |
| if (FieldType->isReferenceType()) { |
| RHS = CGF.EmitReferenceBindingToExpr(MemberInit->getInit(), |
| /*IsInitializer=*/true); |
| CGF.EmitStoreThroughLValue(RHS, LHS, FieldType); |
| } else if (FieldType->isArrayType() && !MemberInit->getInit()) { |
| CGF.EmitMemSetToZero(LHS.getAddress(), Field->getType()); |
| } else if (!CGF.hasAggregateLLVMType(Field->getType())) { |
| RHS = RValue::get(CGF.EmitScalarExpr(MemberInit->getInit(), true)); |
| CGF.EmitStoreThroughLValue(RHS, LHS, FieldType); |
| } else if (MemberInit->getInit()->getType()->isAnyComplexType()) { |
| CGF.EmitComplexExprIntoAddr(MemberInit->getInit(), LHS.getAddress(), |
| LHS.isVolatileQualified()); |
| } else { |
| CGF.EmitAggExpr(MemberInit->getInit(), LHS.getAddress(), |
| LHS.isVolatileQualified(), false, true); |
| |
| if (!CGF.Exceptions) |
| return; |
| |
| const RecordType *RT = FieldType->getAs<RecordType>(); |
| if (!RT) |
| return; |
| |
| CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| if (!RD->hasTrivialDestructor()) { |
| // FIXME: Is this OK for C++0x delegating constructors? |
| CodeGenFunction::EHCleanupBlock Cleanup(CGF); |
| |
| llvm::Value *ThisPtr = CGF.LoadCXXThis(); |
| LValue LHS = CGF.EmitLValueForField(ThisPtr, Field, 0); |
| |
| CXXDestructorDecl *DD = RD->getDestructor(CGF.getContext()); |
| CGF.EmitCXXDestructorCall(DD, Dtor_Complete, LHS.getAddress()); |
| } |
| } |
| } |
| |
| /// Checks whether the given constructor is a valid subject for the |
| /// complete-to-base constructor delegation optimization, i.e. |
| /// emitting the complete constructor as a simple call to the base |
| /// constructor. |
| static bool IsConstructorDelegationValid(const CXXConstructorDecl *Ctor) { |
| |
| // Currently we disable the optimization for classes with virtual |
| // bases because (1) the addresses of parameter variables need to be |
| // consistent across all initializers but (2) the delegate function |
| // call necessarily creates a second copy of the parameter variable. |
| // |
| // The limiting example (purely theoretical AFAIK): |
| // struct A { A(int &c) { c++; } }; |
| // struct B : virtual A { |
| // B(int count) : A(count) { printf("%d\n", count); } |
| // }; |
| // ...although even this example could in principle be emitted as a |
| // delegation since the address of the parameter doesn't escape. |
| if (Ctor->getParent()->getNumVBases()) { |
| // TODO: white-list trivial vbase initializers. This case wouldn't |
| // be subject to the restrictions below. |
| |
| // TODO: white-list cases where: |
| // - there are no non-reference parameters to the constructor |
| // - the initializers don't access any non-reference parameters |
| // - the initializers don't take the address of non-reference |
| // parameters |
| // - etc. |
| // If we ever add any of the above cases, remember that: |
| // - function-try-blocks will always blacklist this optimization |
| // - we need to perform the constructor prologue and cleanup in |
| // EmitConstructorBody. |
| |
| return false; |
| } |
| |
| // We also disable the optimization for variadic functions because |
| // it's impossible to "re-pass" varargs. |
| if (Ctor->getType()->getAs<FunctionProtoType>()->isVariadic()) |
| return false; |
| |
| return true; |
| } |
| |
| /// EmitConstructorBody - Emits the body of the current constructor. |
| void CodeGenFunction::EmitConstructorBody(FunctionArgList &Args) { |
| const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(CurGD.getDecl()); |
| CXXCtorType CtorType = CurGD.getCtorType(); |
| |
| // Before we go any further, try the complete->base constructor |
| // delegation optimization. |
| if (CtorType == Ctor_Complete && IsConstructorDelegationValid(Ctor)) { |
| EmitDelegateCXXConstructorCall(Ctor, Ctor_Base, Args); |
| return; |
| } |
| |
| Stmt *Body = Ctor->getBody(); |
| |
| // Enter the function-try-block before the constructor prologue if |
| // applicable. |
| CXXTryStmtInfo TryInfo; |
| bool IsTryBody = (Body && isa<CXXTryStmt>(Body)); |
| |
| if (IsTryBody) |
| TryInfo = EnterCXXTryStmt(*cast<CXXTryStmt>(Body)); |
| |
| unsigned CleanupStackSize = CleanupEntries.size(); |
| |
| // Emit the constructor prologue, i.e. the base and member |
| // initializers. |
| EmitCtorPrologue(Ctor, CtorType); |
| |
| // Emit the body of the statement. |
| if (IsTryBody) |
| EmitStmt(cast<CXXTryStmt>(Body)->getTryBlock()); |
| else if (Body) |
| EmitStmt(Body); |
| else { |
| assert(Ctor->isImplicit() && "bodyless ctor not implicit"); |
| if (!Ctor->isDefaultConstructor()) { |
| assert(Ctor->isCopyConstructor()); |
| SynthesizeCXXCopyConstructor(Args); |
| } |
| } |
| |
| // Emit any cleanup blocks associated with the member or base |
| // initializers, which includes (along the exceptional path) the |
| // destructors for those members and bases that were fully |
| // constructed. |
| EmitCleanupBlocks(CleanupStackSize); |
| |
| if (IsTryBody) |
| ExitCXXTryStmt(*cast<CXXTryStmt>(Body), TryInfo); |
| } |
| |
| /// EmitCtorPrologue - This routine generates necessary code to initialize |
| /// base classes and non-static data members belonging to this constructor. |
| void CodeGenFunction::EmitCtorPrologue(const CXXConstructorDecl *CD, |
| CXXCtorType CtorType) { |
| const CXXRecordDecl *ClassDecl = CD->getParent(); |
| |
| llvm::SmallVector<CXXBaseOrMemberInitializer *, 8> MemberInitializers; |
| |
| 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 |
| MemberInitializers.push_back(Member); |
| } |
| |
| InitializeVTablePointers(ClassDecl); |
| |
| for (unsigned I = 0, E = MemberInitializers.size(); I != E; ++I) { |
| assert(LiveTemporaries.empty() && |
| "Should not have any live temporaries at initializer start!"); |
| |
| EmitMemberInitializer(*this, ClassDecl, MemberInitializers[I]); |
| } |
| } |
| |
| /// EmitDestructorBody - Emits the body of the current destructor. |
| void CodeGenFunction::EmitDestructorBody(FunctionArgList &Args) { |
| const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CurGD.getDecl()); |
| CXXDtorType DtorType = CurGD.getDtorType(); |
| |
| Stmt *Body = Dtor->getBody(); |
| |
| // If the body is a function-try-block, enter the try before |
| // anything else --- unless we're in a deleting destructor, in which |
| // case we're just going to call the complete destructor and then |
| // call operator delete() on the way out. |
| CXXTryStmtInfo TryInfo; |
| bool isTryBody = (DtorType != Dtor_Deleting && |
| Body && isa<CXXTryStmt>(Body)); |
| if (isTryBody) |
| TryInfo = EnterCXXTryStmt(*cast<CXXTryStmt>(Body)); |
| |
| llvm::BasicBlock *DtorEpilogue = createBasicBlock("dtor.epilogue"); |
| PushCleanupBlock(DtorEpilogue); |
| |
| bool SkipBody = false; // should get jump-threaded |
| |
| // If this is the deleting variant, just invoke the complete |
| // variant, then call the appropriate operator delete() on the way |
| // out. |
| if (DtorType == Dtor_Deleting) { |
| EmitCXXDestructorCall(Dtor, Dtor_Complete, LoadCXXThis()); |
| SkipBody = true; |
| |
| // If this is the complete variant, just invoke the base variant; |
| // the epilogue will destruct the virtual bases. But we can't do |
| // this optimization if the body is a function-try-block, because |
| // we'd introduce *two* handler blocks. |
| } else if (!isTryBody && DtorType == Dtor_Complete) { |
| EmitCXXDestructorCall(Dtor, Dtor_Base, LoadCXXThis()); |
| SkipBody = true; |
| |
| // Otherwise, we're in the base variant, so we need to ensure the |
| // vtable ptrs are right before emitting the body. |
| } else { |
| InitializeVTablePointers(Dtor->getParent()); |
| } |
| |
| // Emit the body of the statement. |
| if (SkipBody) |
| (void) 0; |
| else if (isTryBody) |
| EmitStmt(cast<CXXTryStmt>(Body)->getTryBlock()); |
| else if (Body) |
| EmitStmt(Body); |
| else { |
| assert(Dtor->isImplicit() && "bodyless dtor not implicit"); |
| // nothing to do besides what's in the epilogue |
| } |
| |
| // Jump to the cleanup block. |
| CleanupBlockInfo Info = PopCleanupBlock(); |
| assert(Info.CleanupBlock == DtorEpilogue && "Block mismatch!"); |
| EmitBlock(DtorEpilogue); |
| |
| // Emit the destructor epilogue now. If this is a complete |
| // destructor with a function-try-block, perform the base epilogue |
| // as well. |
| if (isTryBody && DtorType == Dtor_Complete) |
| EmitDtorEpilogue(Dtor, Dtor_Base); |
| EmitDtorEpilogue(Dtor, DtorType); |
| |
| // Link up the cleanup information. |
| if (Info.SwitchBlock) |
| EmitBlock(Info.SwitchBlock); |
| if (Info.EndBlock) |
| EmitBlock(Info.EndBlock); |
| |
| // Exit the try if applicable. |
| if (isTryBody) |
| ExitCXXTryStmt(*cast<CXXTryStmt>(Body), TryInfo); |
| } |
| |
| /// 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. |
| void CodeGenFunction::EmitDtorEpilogue(const CXXDestructorDecl *DD, |
| CXXDtorType DtorType) { |
| assert(!DD->isTrivial() && |
| "Should not emit dtor epilogue for trivial dtor!"); |
| |
| const CXXRecordDecl *ClassDecl = DD->getParent(); |
| |
| // In a deleting destructor, we've already called the complete |
| // destructor as a subroutine, so we just have to delete the |
| // appropriate value. |
| if (DtorType == Dtor_Deleting) { |
| assert(DD->getOperatorDelete() && |
| "operator delete missing - EmitDtorEpilogue"); |
| EmitDeleteCall(DD->getOperatorDelete(), LoadCXXThis(), |
| getContext().getTagDeclType(ClassDecl)); |
| return; |
| } |
| |
| // For complete destructors, we've already called the base |
| // destructor (in GenerateBody), so we just need to destruct all the |
| // virtual bases. |
| if (DtorType == Dtor_Complete) { |
| // 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 = GetAddressOfBaseOfCompleteClass(LoadCXXThis(), |
| true, |
| ClassDecl, |
| BaseClassDecl); |
| EmitCXXDestructorCall(D, Dtor_Base, V); |
| } |
| return; |
| } |
| |
| assert(DtorType == Dtor_Base); |
| |
| // 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, |
| // 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); |
| } |
| } |
| |
| /// EmitCXXAggrConstructorCall - This routine essentially creates a (nested) |
| /// for-loop to call the default constructor on individual members of the |
| /// array. |
| /// 'D' is the default constructor for elements of the array, 'ArrayTy' is the |
| /// array type and 'ArrayPtr' points to the beginning fo the array. |
| /// It is assumed that all relevant checks have been made by the caller. |
| void |
| CodeGenFunction::EmitCXXAggrConstructorCall(const CXXConstructorDecl *D, |
| const ConstantArrayType *ArrayTy, |
| llvm::Value *ArrayPtr, |
| CallExpr::const_arg_iterator ArgBeg, |
| CallExpr::const_arg_iterator ArgEnd) { |
| |
| const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| llvm::Value * NumElements = |
| llvm::ConstantInt::get(SizeTy, |
| getContext().getConstantArrayElementCount(ArrayTy)); |
| |
| EmitCXXAggrConstructorCall(D, NumElements, ArrayPtr, ArgBeg, ArgEnd); |
| } |
| |
| void |
| CodeGenFunction::EmitCXXAggrConstructorCall(const CXXConstructorDecl *D, |
| llvm::Value *NumElements, |
| llvm::Value *ArrayPtr, |
| CallExpr::const_arg_iterator ArgBeg, |
| CallExpr::const_arg_iterator ArgEnd) { |
| const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| |
| // Create a temporary for the loop index and initialize it with 0. |
| llvm::Value *IndexPtr = CreateTempAlloca(SizeTy, "loop.index"); |
| llvm::Value *Zero = llvm::Constant::getNullValue(SizeTy); |
| Builder.CreateStore(Zero, 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. |
| llvm::Value *Counter = Builder.CreateLoad(IndexPtr); |
| llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElements, "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); |
| llvm::Value *Address = Builder.CreateInBoundsGEP(ArrayPtr, Counter, |
| "arrayidx"); |
| |
| // C++ [class.temporary]p4: |
| // There are two contexts in which temporaries are destroyed at a different |
| // point than the end of the full-expression. The first context is when a |
| // default constructor is called to initialize an element of an array. |
| // If the constructor has one or more default arguments, the destruction of |
| // every temporary created in a default argument expression is sequenced |
| // before the construction of the next array element, if any. |
| |
| // Keep track of the current number of live temporaries. |
| { |
| CXXTemporariesCleanupScope Scope(*this); |
| |
| EmitCXXConstructorCall(D, Ctor_Complete, Address, ArgBeg, ArgEnd); |
| } |
| |
| EmitBlock(ContinueBlock); |
| |
| // Emit the increment of the loop counter. |
| llvm::Value *NextVal = llvm::ConstantInt::get(SizeTy, 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); |
| } |
| |
| /// EmitCXXAggrDestructorCall - calls the default destructor on array |
| /// elements in reverse order of construction. |
| void |
| CodeGenFunction::EmitCXXAggrDestructorCall(const CXXDestructorDecl *D, |
| const ArrayType *Array, |
| llvm::Value *This) { |
| const ConstantArrayType *CA = dyn_cast<ConstantArrayType>(Array); |
| assert(CA && "Do we support VLA for destruction ?"); |
| uint64_t ElementCount = getContext().getConstantArrayElementCount(CA); |
| |
| const llvm::Type *SizeLTy = ConvertType(getContext().getSizeType()); |
| llvm::Value* ElementCountPtr = llvm::ConstantInt::get(SizeLTy, ElementCount); |
| EmitCXXAggrDestructorCall(D, ElementCountPtr, This); |
| } |
| |
| /// EmitCXXAggrDestructorCall - calls the default destructor on array |
| /// elements in reverse order of construction. |
| void |
| CodeGenFunction::EmitCXXAggrDestructorCall(const CXXDestructorDecl *D, |
| llvm::Value *UpperCount, |
| llvm::Value *This) { |
| const llvm::Type *SizeLTy = ConvertType(getContext().getSizeType()); |
| llvm::Value *One = llvm::ConstantInt::get(SizeLTy, 1); |
| |
| // Create a temporary for the loop index and initialize it with count of |
| // array elements. |
| llvm::Value *IndexPtr = CreateTempAlloca(SizeLTy, "loop.index"); |
| |
| // Store the number of elements in the index pointer. |
| Builder.CreateStore(UpperCount, 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 != 0 fall to the loop body, |
| // otherwise, go to the block after the for-loop. |
| llvm::Value* zeroConstant = |
| llvm::Constant::getNullValue(SizeLTy); |
| llvm::Value *Counter = Builder.CreateLoad(IndexPtr); |
| llvm::Value *IsNE = Builder.CreateICmpNE(Counter, zeroConstant, |
| "isne"); |
| // If the condition is true, execute the body. |
| Builder.CreateCondBr(IsNE, 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); |
| Counter = Builder.CreateSub(Counter, One); |
| llvm::Value *Address = Builder.CreateInBoundsGEP(This, Counter, "arrayidx"); |
| EmitCXXDestructorCall(D, Dtor_Complete, Address); |
| |
| EmitBlock(ContinueBlock); |
| |
| // Emit the decrement of the loop counter. |
| Counter = Builder.CreateLoad(IndexPtr); |
| Counter = Builder.CreateSub(Counter, One, "dec"); |
| Builder.CreateStore(Counter, IndexPtr); |
| |
| // Finally, branch back up to the condition for the next iteration. |
| EmitBranch(CondBlock); |
| |
| // Emit the fall-through block. |
| EmitBlock(AfterFor, true); |
| } |
| |
| /// GenerateCXXAggrDestructorHelper - Generates a helper function which when |
| /// invoked, calls the default destructor on array elements in reverse order of |
| /// construction. |
| llvm::Constant * |
| CodeGenFunction::GenerateCXXAggrDestructorHelper(const CXXDestructorDecl *D, |
| const ArrayType *Array, |
| llvm::Value *This) { |
| FunctionArgList Args; |
| ImplicitParamDecl *Dst = |
| ImplicitParamDecl::Create(getContext(), 0, |
| SourceLocation(), 0, |
| getContext().getPointerType(getContext().VoidTy)); |
| Args.push_back(std::make_pair(Dst, Dst->getType())); |
| |
| llvm::SmallString<16> Name; |
| llvm::raw_svector_ostream(Name) << "__tcf_" << (++UniqueAggrDestructorCount); |
| QualType R = getContext().VoidTy; |
| const CGFunctionInfo &FI |
| = CGM.getTypes().getFunctionInfo(R, Args, FunctionType::ExtInfo()); |
| const llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI, false); |
| llvm::Function *Fn = |
| llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage, |
| Name.str(), |
| &CGM.getModule()); |
| IdentifierInfo *II = &CGM.getContext().Idents.get(Name.str()); |
| FunctionDecl *FD = FunctionDecl::Create(getContext(), |
| getContext().getTranslationUnitDecl(), |
| SourceLocation(), II, R, 0, |
| FunctionDecl::Static, |
| FunctionDecl::None, |
| false, true); |
| StartFunction(FD, R, Fn, Args, SourceLocation()); |
| QualType BaseElementTy = getContext().getBaseElementType(Array); |
| const llvm::Type *BasePtr = ConvertType(BaseElementTy); |
| BasePtr = llvm::PointerType::getUnqual(BasePtr); |
| llvm::Value *BaseAddrPtr = Builder.CreateBitCast(This, BasePtr); |
| EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr); |
| FinishFunction(); |
| llvm::Type *Ptr8Ty = llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext), |
| 0); |
| llvm::Constant *m = llvm::ConstantExpr::getBitCast(Fn, Ptr8Ty); |
| return m; |
| } |
| |
| |
| void |
| CodeGenFunction::EmitCXXConstructorCall(const CXXConstructorDecl *D, |
| CXXCtorType Type, |
| llvm::Value *This, |
| CallExpr::const_arg_iterator ArgBeg, |
| CallExpr::const_arg_iterator ArgEnd) { |
| if (D->isTrivial()) { |
| if (ArgBeg == ArgEnd) { |
| // Trivial default constructor, no codegen required. |
| assert(D->isDefaultConstructor() && |
| "trivial 0-arg ctor not a default ctor"); |
| return; |
| } |
| |
| assert(ArgBeg + 1 == ArgEnd && "unexpected argcount for trivial ctor"); |
| assert(D->isCopyConstructor() && "trivial 1-arg ctor not a copy ctor"); |
| |
| const Expr *E = (*ArgBeg); |
| QualType Ty = E->getType(); |
| llvm::Value *Src = EmitLValue(E).getAddress(); |
| EmitAggregateCopy(This, Src, Ty); |
| return; |
| } |
| |
| llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(D, Type)); |
| llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(D, Type); |
| |
| EmitCXXMemberCall(D, Callee, ReturnValueSlot(), This, VTT, ArgBeg, ArgEnd); |
| } |
| |
| void |
| CodeGenFunction::EmitDelegateCXXConstructorCall(const CXXConstructorDecl *Ctor, |
| CXXCtorType CtorType, |
| const FunctionArgList &Args) { |
| CallArgList DelegateArgs; |
| |
| FunctionArgList::const_iterator I = Args.begin(), E = Args.end(); |
| assert(I != E && "no parameters to constructor"); |
| |
| // this |
| DelegateArgs.push_back(std::make_pair(RValue::get(LoadCXXThis()), |
| I->second)); |
| ++I; |
| |
| // vtt |
| if (llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(Ctor, CtorType))) { |
| QualType VoidPP = getContext().getPointerType(getContext().VoidPtrTy); |
| DelegateArgs.push_back(std::make_pair(RValue::get(VTT), VoidPP)); |
| |
| if (CodeGenVTables::needsVTTParameter(CurGD)) { |
| assert(I != E && "cannot skip vtt parameter, already done with args"); |
| assert(I->second == VoidPP && "skipping parameter not of vtt type"); |
| ++I; |
| } |
| } |
| |
| // Explicit arguments. |
| for (; I != E; ++I) { |
| |
| const VarDecl *Param = I->first; |
| QualType ArgType = Param->getType(); // because we're passing it to itself |
| |
| // StartFunction converted the ABI-lowered parameter(s) into a |
| // local alloca. We need to turn that into an r-value suitable |
| // for EmitCall. |
| llvm::Value *Local = GetAddrOfLocalVar(Param); |
| RValue Arg; |
| |
| // For the most part, we just need to load the alloca, except: |
| // 1) aggregate r-values are actually pointers to temporaries, and |
| // 2) references to aggregates are pointers directly to the aggregate. |
| // I don't know why references to non-aggregates are different here. |
| if (ArgType->isReferenceType()) { |
| const ReferenceType *RefType = ArgType->getAs<ReferenceType>(); |
| if (hasAggregateLLVMType(RefType->getPointeeType())) |
| Arg = RValue::getAggregate(Local); |
| else |
| // Locals which are references to scalars are represented |
| // with allocas holding the pointer. |
| Arg = RValue::get(Builder.CreateLoad(Local)); |
| } else { |
| if (hasAggregateLLVMType(ArgType)) |
| Arg = RValue::getAggregate(Local); |
| else |
| Arg = RValue::get(EmitLoadOfScalar(Local, false, ArgType)); |
| } |
| |
| DelegateArgs.push_back(std::make_pair(Arg, ArgType)); |
| } |
| |
| EmitCall(CGM.getTypes().getFunctionInfo(Ctor, CtorType), |
| CGM.GetAddrOfCXXConstructor(Ctor, CtorType), |
| ReturnValueSlot(), DelegateArgs, Ctor); |
| } |
| |
| void CodeGenFunction::EmitCXXDestructorCall(const CXXDestructorDecl *DD, |
| CXXDtorType Type, |
| llvm::Value *This) { |
| llvm::Value *VTT = GetVTTParameter(*this, GlobalDecl(DD, Type)); |
| llvm::Value *Callee = CGM.GetAddrOfCXXDestructor(DD, Type); |
| |
| EmitCXXMemberCall(DD, Callee, ReturnValueSlot(), This, VTT, 0, 0); |
| } |
| |
| llvm::Value * |
| CodeGenFunction::GetVirtualBaseClassOffset(llvm::Value *This, |
| const CXXRecordDecl *ClassDecl, |
| const CXXRecordDecl *BaseClassDecl) { |
| const llvm::Type *Int8PtrTy = |
| llvm::Type::getInt8Ty(VMContext)->getPointerTo(); |
| |
| llvm::Value *VTablePtr = Builder.CreateBitCast(This, |
| Int8PtrTy->getPointerTo()); |
| VTablePtr = Builder.CreateLoad(VTablePtr, "vtable"); |
| |
| int64_t VBaseOffsetOffset = |
| CGM.getVTables().getVirtualBaseOffsetOffset(ClassDecl, BaseClassDecl); |
| |
| llvm::Value *VBaseOffsetPtr = |
| Builder.CreateConstGEP1_64(VTablePtr, VBaseOffsetOffset, "vbase.offset.ptr"); |
| const llvm::Type *PtrDiffTy = |
| ConvertType(getContext().getPointerDiffType()); |
| |
| VBaseOffsetPtr = Builder.CreateBitCast(VBaseOffsetPtr, |
| PtrDiffTy->getPointerTo()); |
| |
| llvm::Value *VBaseOffset = Builder.CreateLoad(VBaseOffsetPtr, "vbase.offset"); |
| |
| return VBaseOffset; |
| } |
| |
| void |
| CodeGenFunction::InitializeVTablePointer(BaseSubobject Base, |
| const CXXRecordDecl *NearestVBase, |
| llvm::Constant *VTable, |
| const CXXRecordDecl *VTableClass) { |
| const CXXRecordDecl *RD = Base.getBase(); |
| |
| // Compute the address point. |
| llvm::Value *VTableAddressPoint; |
| |
| // Check if we need to use a vtable from the VTT. |
| if (CodeGenVTables::needsVTTParameter(CurGD) && |
| (RD->getNumVBases() || NearestVBase)) { |
| // Get the secondary vpointer index. |
| uint64_t VirtualPointerIndex = |
| CGM.getVTables().getSecondaryVirtualPointerIndex(VTableClass, Base); |
| |
| /// Load the VTT. |
| llvm::Value *VTT = LoadCXXVTT(); |
| if (VirtualPointerIndex) |
| VTT = Builder.CreateConstInBoundsGEP1_64(VTT, VirtualPointerIndex); |
| |
| // And load the address point from the VTT. |
| VTableAddressPoint = Builder.CreateLoad(VTT); |
| } else { |
| uint64_t AddressPoint = CGM.getVTables().getAddressPoint(Base, VTableClass); |
| VTableAddressPoint = |
| Builder.CreateConstInBoundsGEP2_64(VTable, 0, AddressPoint); |
| } |
| |
| // Compute where to store the address point. |
| llvm::Value *VTableField; |
| |
| if (CodeGenVTables::needsVTTParameter(CurGD) && NearestVBase) { |
| // We need to use the virtual base offset offset because the virtual base |
| // might have a different offset in the most derived class. |
| VTableField = GetAddressOfBaseClass(LoadCXXThis(), VTableClass, RD, |
| /*NullCheckValue=*/false); |
| } else { |
| const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGM.getLLVMContext()); |
| |
| VTableField = Builder.CreateBitCast(LoadCXXThis(), Int8PtrTy); |
| VTableField = |
| Builder.CreateConstInBoundsGEP1_64(VTableField, Base.getBaseOffset() / 8); |
| } |
| |
| // Finally, store the address point. |
| const llvm::Type *AddressPointPtrTy = |
| VTableAddressPoint->getType()->getPointerTo(); |
| VTableField = Builder.CreateBitCast(VTableField, AddressPointPtrTy); |
| Builder.CreateStore(VTableAddressPoint, VTableField); |
| } |
| |
| void |
| CodeGenFunction::InitializeVTablePointers(BaseSubobject Base, |
| const CXXRecordDecl *NearestVBase, |
| bool BaseIsNonVirtualPrimaryBase, |
| llvm::Constant *VTable, |
| const CXXRecordDecl *VTableClass, |
| VisitedVirtualBasesSetTy& VBases) { |
| // If this base is a non-virtual primary base the address point has already |
| // been set. |
| if (!BaseIsNonVirtualPrimaryBase) { |
| // Initialize the vtable pointer for this base. |
| InitializeVTablePointer(Base, NearestVBase, VTable, VTableClass); |
| } |
| |
| const CXXRecordDecl *RD = Base.getBase(); |
| |
| // Traverse bases. |
| for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), |
| E = RD->bases_end(); I != E; ++I) { |
| CXXRecordDecl *BaseDecl |
| = cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); |
| |
| // Ignore classes without a vtable. |
| if (!BaseDecl->isDynamicClass()) |
| continue; |
| |
| uint64_t BaseOffset; |
| bool BaseDeclIsNonVirtualPrimaryBase; |
| |
| if (I->isVirtual()) { |
| // Check if we've visited this virtual base before. |
| if (!VBases.insert(BaseDecl)) |
| continue; |
| |
| const ASTRecordLayout &Layout = |
| getContext().getASTRecordLayout(VTableClass); |
| |
| BaseOffset = Layout.getVBaseClassOffset(BaseDecl); |
| BaseDeclIsNonVirtualPrimaryBase = false; |
| } else { |
| const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); |
| |
| BaseOffset = Base.getBaseOffset() + Layout.getBaseClassOffset(BaseDecl); |
| BaseDeclIsNonVirtualPrimaryBase = Layout.getPrimaryBase() == BaseDecl; |
| } |
| |
| InitializeVTablePointers(BaseSubobject(BaseDecl, BaseOffset), |
| I->isVirtual() ? BaseDecl : NearestVBase, |
| BaseDeclIsNonVirtualPrimaryBase, |
| VTable, VTableClass, VBases); |
| } |
| } |
| |
| void CodeGenFunction::InitializeVTablePointers(const CXXRecordDecl *RD) { |
| // Ignore classes without a vtable. |
| if (!RD->isDynamicClass()) |
| return; |
| |
| // Get the VTable. |
| llvm::Constant *VTable = CGM.getVTables().GetAddrOfVTable(RD); |
| |
| // Initialize the vtable pointers for this class and all of its bases. |
| VisitedVirtualBasesSetTy VBases; |
| InitializeVTablePointers(BaseSubobject(RD, 0), /*NearestVBase=*/0, |
| /*BaseIsNonVirtualPrimaryBase=*/false, |
| VTable, RD, VBases); |
| } |