| //===--- CGExprCXX.cpp - Emit LLVM Code for C++ expressions ---------------===// |
| // |
| // 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 code generation of C++ expressions |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CodeGenFunction.h" |
| #include "CGObjCRuntime.h" |
| using namespace clang; |
| using namespace CodeGen; |
| |
| RValue CodeGenFunction::EmitCXXMemberCall(const CXXMethodDecl *MD, |
| llvm::Value *Callee, |
| ReturnValueSlot ReturnValue, |
| llvm::Value *This, |
| llvm::Value *VTT, |
| CallExpr::const_arg_iterator ArgBeg, |
| CallExpr::const_arg_iterator ArgEnd) { |
| assert(MD->isInstance() && |
| "Trying to emit a member call expr on a static method!"); |
| |
| const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| |
| CallArgList Args; |
| |
| // Push the this ptr. |
| Args.push_back(std::make_pair(RValue::get(This), |
| MD->getThisType(getContext()))); |
| |
| // If there is a VTT parameter, emit it. |
| if (VTT) { |
| QualType T = getContext().getPointerType(getContext().VoidPtrTy); |
| Args.push_back(std::make_pair(RValue::get(VTT), T)); |
| } |
| |
| // And the rest of the call args |
| EmitCallArgs(Args, FPT, ArgBeg, ArgEnd); |
| |
| QualType ResultType = FPT->getResultType(); |
| return EmitCall(CGM.getTypes().getFunctionInfo(ResultType, Args, |
| FPT->getExtInfo()), |
| Callee, ReturnValue, Args, MD); |
| } |
| |
| /// canDevirtualizeMemberFunctionCalls - Checks whether virtual calls on given |
| /// expr can be devirtualized. |
| static bool canDevirtualizeMemberFunctionCalls(const Expr *Base) { |
| if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) { |
| if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) { |
| // This is a record decl. We know the type and can devirtualize it. |
| return VD->getType()->isRecordType(); |
| } |
| |
| return false; |
| } |
| |
| // We can always devirtualize calls on temporary object expressions. |
| if (isa<CXXConstructExpr>(Base)) |
| return true; |
| |
| // And calls on bound temporaries. |
| if (isa<CXXBindTemporaryExpr>(Base)) |
| return true; |
| |
| // Check if this is a call expr that returns a record type. |
| if (const CallExpr *CE = dyn_cast<CallExpr>(Base)) |
| return CE->getCallReturnType()->isRecordType(); |
| |
| // We can't devirtualize the call. |
| return false; |
| } |
| |
| RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE, |
| ReturnValueSlot ReturnValue) { |
| if (isa<BinaryOperator>(CE->getCallee()->IgnoreParens())) |
| return EmitCXXMemberPointerCallExpr(CE, ReturnValue); |
| |
| const MemberExpr *ME = cast<MemberExpr>(CE->getCallee()->IgnoreParens()); |
| const CXXMethodDecl *MD = cast<CXXMethodDecl>(ME->getMemberDecl()); |
| |
| if (MD->isStatic()) { |
| // The method is static, emit it as we would a regular call. |
| llvm::Value *Callee = CGM.GetAddrOfFunction(MD); |
| return EmitCall(getContext().getPointerType(MD->getType()), Callee, |
| ReturnValue, CE->arg_begin(), CE->arg_end()); |
| } |
| |
| const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| |
| const llvm::Type *Ty = |
| CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), |
| FPT->isVariadic()); |
| llvm::Value *This; |
| |
| if (ME->isArrow()) |
| This = EmitScalarExpr(ME->getBase()); |
| else { |
| LValue BaseLV = EmitLValue(ME->getBase()); |
| This = BaseLV.getAddress(); |
| } |
| |
| if (MD->isCopyAssignment() && MD->isTrivial()) { |
| // We don't like to generate the trivial copy assignment operator when |
| // it isn't necessary; just produce the proper effect here. |
| llvm::Value *RHS = EmitLValue(*CE->arg_begin()).getAddress(); |
| EmitAggregateCopy(This, RHS, CE->getType()); |
| return RValue::get(This); |
| } |
| |
| // C++ [class.virtual]p12: |
| // Explicit qualification with the scope operator (5.1) suppresses the |
| // virtual call mechanism. |
| // |
| // We also don't emit a virtual call if the base expression has a record type |
| // because then we know what the type is. |
| llvm::Value *Callee; |
| if (const CXXDestructorDecl *Destructor |
| = dyn_cast<CXXDestructorDecl>(MD)) { |
| if (Destructor->isTrivial()) |
| return RValue::get(0); |
| if (MD->isVirtual() && !ME->hasQualifier() && |
| !canDevirtualizeMemberFunctionCalls(ME->getBase())) { |
| Callee = BuildVirtualCall(Destructor, Dtor_Complete, This, Ty); |
| } else { |
| Callee = CGM.GetAddrOfFunction(GlobalDecl(Destructor, Dtor_Complete), Ty); |
| } |
| } else if (MD->isVirtual() && !ME->hasQualifier() && |
| !canDevirtualizeMemberFunctionCalls(ME->getBase())) { |
| Callee = BuildVirtualCall(MD, This, Ty); |
| } else { |
| Callee = CGM.GetAddrOfFunction(MD, Ty); |
| } |
| |
| return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0, |
| CE->arg_begin(), CE->arg_end()); |
| } |
| |
| RValue |
| CodeGenFunction::EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E, |
| ReturnValueSlot ReturnValue) { |
| const BinaryOperator *BO = |
| cast<BinaryOperator>(E->getCallee()->IgnoreParens()); |
| const Expr *BaseExpr = BO->getLHS(); |
| const Expr *MemFnExpr = BO->getRHS(); |
| |
| const MemberPointerType *MPT = |
| MemFnExpr->getType()->getAs<MemberPointerType>(); |
| const FunctionProtoType *FPT = |
| MPT->getPointeeType()->getAs<FunctionProtoType>(); |
| const CXXRecordDecl *RD = |
| cast<CXXRecordDecl>(MPT->getClass()->getAs<RecordType>()->getDecl()); |
| |
| const llvm::FunctionType *FTy = |
| CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(RD, FPT), |
| FPT->isVariadic()); |
| |
| const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext); |
| |
| // Get the member function pointer. |
| llvm::Value *MemFnPtr = CreateMemTemp(MemFnExpr->getType(), "mem.fn"); |
| EmitAggExpr(MemFnExpr, MemFnPtr, /*VolatileDest=*/false); |
| |
| // Emit the 'this' pointer. |
| llvm::Value *This; |
| |
| if (BO->getOpcode() == BinaryOperator::PtrMemI) |
| This = EmitScalarExpr(BaseExpr); |
| else |
| This = EmitLValue(BaseExpr).getAddress(); |
| |
| // Adjust it. |
| llvm::Value *Adj = Builder.CreateStructGEP(MemFnPtr, 1); |
| Adj = Builder.CreateLoad(Adj, "mem.fn.adj"); |
| |
| llvm::Value *Ptr = Builder.CreateBitCast(This, Int8PtrTy, "ptr"); |
| Ptr = Builder.CreateGEP(Ptr, Adj, "adj"); |
| |
| This = Builder.CreateBitCast(Ptr, This->getType(), "this"); |
| |
| llvm::Value *FnPtr = Builder.CreateStructGEP(MemFnPtr, 0, "mem.fn.ptr"); |
| |
| const llvm::Type *PtrDiffTy = ConvertType(getContext().getPointerDiffType()); |
| |
| llvm::Value *FnAsInt = Builder.CreateLoad(FnPtr, "fn"); |
| |
| // If the LSB in the function pointer is 1, the function pointer points to |
| // a virtual function. |
| llvm::Value *IsVirtual |
| = Builder.CreateAnd(FnAsInt, llvm::ConstantInt::get(PtrDiffTy, 1), |
| "and"); |
| |
| IsVirtual = Builder.CreateTrunc(IsVirtual, |
| llvm::Type::getInt1Ty(VMContext)); |
| |
| llvm::BasicBlock *FnVirtual = createBasicBlock("fn.virtual"); |
| llvm::BasicBlock *FnNonVirtual = createBasicBlock("fn.nonvirtual"); |
| llvm::BasicBlock *FnEnd = createBasicBlock("fn.end"); |
| |
| Builder.CreateCondBr(IsVirtual, FnVirtual, FnNonVirtual); |
| EmitBlock(FnVirtual); |
| |
| const llvm::Type *VTableTy = |
| FTy->getPointerTo()->getPointerTo(); |
| |
| llvm::Value *VTable = Builder.CreateBitCast(This, VTableTy->getPointerTo()); |
| VTable = Builder.CreateLoad(VTable); |
| |
| VTable = Builder.CreateBitCast(VTable, Int8PtrTy); |
| llvm::Value *VTableOffset = |
| Builder.CreateSub(FnAsInt, llvm::ConstantInt::get(PtrDiffTy, 1)); |
| |
| VTable = Builder.CreateGEP(VTable, VTableOffset, "fn"); |
| VTable = Builder.CreateBitCast(VTable, VTableTy); |
| |
| llvm::Value *VirtualFn = Builder.CreateLoad(VTable, "virtualfn"); |
| |
| EmitBranch(FnEnd); |
| EmitBlock(FnNonVirtual); |
| |
| // If the function is not virtual, just load the pointer. |
| llvm::Value *NonVirtualFn = Builder.CreateLoad(FnPtr, "fn"); |
| NonVirtualFn = Builder.CreateIntToPtr(NonVirtualFn, FTy->getPointerTo()); |
| |
| EmitBlock(FnEnd); |
| |
| llvm::PHINode *Callee = Builder.CreatePHI(FTy->getPointerTo()); |
| Callee->reserveOperandSpace(2); |
| Callee->addIncoming(VirtualFn, FnVirtual); |
| Callee->addIncoming(NonVirtualFn, FnNonVirtual); |
| |
| CallArgList Args; |
| |
| QualType ThisType = |
| getContext().getPointerType(getContext().getTagDeclType(RD)); |
| |
| // Push the this ptr. |
| Args.push_back(std::make_pair(RValue::get(This), ThisType)); |
| |
| // And the rest of the call args |
| EmitCallArgs(Args, FPT, E->arg_begin(), E->arg_end()); |
| const FunctionType *BO_FPT = BO->getType()->getAs<FunctionProtoType>(); |
| return EmitCall(CGM.getTypes().getFunctionInfo(Args, BO_FPT), Callee, |
| ReturnValue, Args); |
| } |
| |
| RValue |
| CodeGenFunction::EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E, |
| const CXXMethodDecl *MD, |
| ReturnValueSlot ReturnValue) { |
| assert(MD->isInstance() && |
| "Trying to emit a member call expr on a static method!"); |
| if (MD->isCopyAssignment()) { |
| const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(MD->getDeclContext()); |
| if (ClassDecl->hasTrivialCopyAssignment()) { |
| assert(!ClassDecl->hasUserDeclaredCopyAssignment() && |
| "EmitCXXOperatorMemberCallExpr - user declared copy assignment"); |
| LValue LV = EmitLValue(E->getArg(0)); |
| llvm::Value *This; |
| if (LV.isPropertyRef()) { |
| llvm::Value *AggLoc = CreateMemTemp(E->getArg(1)->getType()); |
| EmitAggExpr(E->getArg(1), AggLoc, false /*VolatileDest*/); |
| EmitObjCPropertySet(LV.getPropertyRefExpr(), |
| RValue::getAggregate(AggLoc, false /*VolatileDest*/)); |
| return RValue::getAggregate(0, false); |
| } |
| else |
| This = LV.getAddress(); |
| |
| llvm::Value *Src = EmitLValue(E->getArg(1)).getAddress(); |
| QualType Ty = E->getType(); |
| EmitAggregateCopy(This, Src, Ty); |
| return RValue::get(This); |
| } |
| } |
| |
| const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| const llvm::Type *Ty = |
| CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), |
| FPT->isVariadic()); |
| LValue LV = EmitLValue(E->getArg(0)); |
| llvm::Value *This; |
| if (LV.isPropertyRef()) { |
| RValue RV = EmitLoadOfPropertyRefLValue(LV, E->getArg(0)->getType()); |
| assert (!RV.isScalar() && "EmitCXXOperatorMemberCallExpr"); |
| This = RV.getAggregateAddr(); |
| } |
| else |
| This = LV.getAddress(); |
| |
| llvm::Value *Callee; |
| if (MD->isVirtual() && !canDevirtualizeMemberFunctionCalls(E->getArg(0))) |
| Callee = BuildVirtualCall(MD, This, Ty); |
| else |
| Callee = CGM.GetAddrOfFunction(MD, Ty); |
| |
| return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0, |
| E->arg_begin() + 1, E->arg_end()); |
| } |
| |
| void |
| CodeGenFunction::EmitCXXConstructExpr(llvm::Value *Dest, |
| const CXXConstructExpr *E) { |
| assert(Dest && "Must have a destination!"); |
| const CXXConstructorDecl *CD = E->getConstructor(); |
| const ConstantArrayType *Array = |
| getContext().getAsConstantArrayType(E->getType()); |
| // For a copy constructor, even if it is trivial, must fall thru so |
| // its argument is code-gen'ed. |
| if (!CD->isCopyConstructor()) { |
| QualType InitType = E->getType(); |
| if (Array) |
| InitType = getContext().getBaseElementType(Array); |
| const CXXRecordDecl *RD = |
| cast<CXXRecordDecl>(InitType->getAs<RecordType>()->getDecl()); |
| if (RD->hasTrivialConstructor()) |
| return; |
| } |
| // Code gen optimization to eliminate copy constructor and return |
| // its first argument instead, if in fact that argument is a temporary |
| // object. |
| if (getContext().getLangOptions().ElideConstructors && E->isElidable()) { |
| if (const Expr *Arg = E->getArg(0)->getTemporaryObject()) { |
| EmitAggExpr(Arg, Dest, false); |
| return; |
| } |
| } |
| if (Array) { |
| QualType BaseElementTy = getContext().getBaseElementType(Array); |
| const llvm::Type *BasePtr = ConvertType(BaseElementTy); |
| BasePtr = llvm::PointerType::getUnqual(BasePtr); |
| llvm::Value *BaseAddrPtr = |
| Builder.CreateBitCast(Dest, BasePtr); |
| |
| EmitCXXAggrConstructorCall(CD, Array, BaseAddrPtr, |
| E->arg_begin(), E->arg_end()); |
| } |
| else { |
| CXXCtorType Type = |
| (E->getConstructionKind() == CXXConstructExpr::CK_Complete) |
| ? Ctor_Complete : Ctor_Base; |
| bool ForVirtualBase = |
| E->getConstructionKind() == CXXConstructExpr::CK_VirtualBase; |
| |
| // Call the constructor. |
| EmitCXXConstructorCall(CD, Type, ForVirtualBase, Dest, |
| E->arg_begin(), E->arg_end()); |
| } |
| } |
| |
| static CharUnits CalculateCookiePadding(ASTContext &Ctx, QualType ElementType) { |
| const RecordType *RT = ElementType->getAs<RecordType>(); |
| if (!RT) |
| return CharUnits::Zero(); |
| |
| const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); |
| if (!RD) |
| return CharUnits::Zero(); |
| |
| // Check if the class has a trivial destructor. |
| if (RD->hasTrivialDestructor()) { |
| // Check if the usual deallocation function takes two arguments. |
| const CXXMethodDecl *UsualDeallocationFunction = 0; |
| |
| DeclarationName OpName = |
| Ctx.DeclarationNames.getCXXOperatorName(OO_Array_Delete); |
| DeclContext::lookup_const_iterator Op, OpEnd; |
| for (llvm::tie(Op, OpEnd) = RD->lookup(OpName); |
| Op != OpEnd; ++Op) { |
| const CXXMethodDecl *Delete = cast<CXXMethodDecl>(*Op); |
| |
| if (Delete->isUsualDeallocationFunction()) { |
| UsualDeallocationFunction = Delete; |
| break; |
| } |
| } |
| |
| // No usual deallocation function, we don't need a cookie. |
| if (!UsualDeallocationFunction) |
| return CharUnits::Zero(); |
| |
| // The usual deallocation function doesn't take a size_t argument, so we |
| // don't need a cookie. |
| if (UsualDeallocationFunction->getNumParams() == 1) |
| return CharUnits::Zero(); |
| |
| assert(UsualDeallocationFunction->getNumParams() == 2 && |
| "Unexpected deallocation function type!"); |
| } |
| |
| // Padding is the maximum of sizeof(size_t) and alignof(ElementType) |
| return std::max(Ctx.getTypeSizeInChars(Ctx.getSizeType()), |
| Ctx.getTypeAlignInChars(ElementType)); |
| } |
| |
| static CharUnits CalculateCookiePadding(ASTContext &Ctx, const CXXNewExpr *E) { |
| if (!E->isArray()) |
| return CharUnits::Zero(); |
| |
| // No cookie is required if the new operator being used is |
| // ::operator new[](size_t, void*). |
| const FunctionDecl *OperatorNew = E->getOperatorNew(); |
| if (OperatorNew->getDeclContext()->getLookupContext()->isFileContext()) { |
| if (OperatorNew->getNumParams() == 2) { |
| CanQualType ParamType = |
| Ctx.getCanonicalType(OperatorNew->getParamDecl(1)->getType()); |
| |
| if (ParamType == Ctx.VoidPtrTy) |
| return CharUnits::Zero(); |
| } |
| } |
| |
| return CalculateCookiePadding(Ctx, E->getAllocatedType()); |
| } |
| |
| static llvm::Value *EmitCXXNewAllocSize(ASTContext &Context, |
| CodeGenFunction &CGF, |
| const CXXNewExpr *E, |
| llvm::Value *& NumElements) { |
| QualType Type = E->getAllocatedType(); |
| CharUnits TypeSize = CGF.getContext().getTypeSizeInChars(Type); |
| const llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); |
| |
| if (!E->isArray()) |
| return llvm::ConstantInt::get(SizeTy, TypeSize.getQuantity()); |
| |
| CharUnits CookiePadding = CalculateCookiePadding(CGF.getContext(), E); |
| |
| Expr::EvalResult Result; |
| if (E->getArraySize()->Evaluate(Result, CGF.getContext()) && |
| !Result.HasSideEffects && Result.Val.isInt()) { |
| |
| CharUnits AllocSize = |
| Result.Val.getInt().getZExtValue() * TypeSize + CookiePadding; |
| |
| NumElements = |
| llvm::ConstantInt::get(SizeTy, Result.Val.getInt().getZExtValue()); |
| while (const ArrayType *AType = Context.getAsArrayType(Type)) { |
| const llvm::ArrayType *llvmAType = |
| cast<llvm::ArrayType>(CGF.ConvertType(Type)); |
| NumElements = |
| CGF.Builder.CreateMul(NumElements, |
| llvm::ConstantInt::get( |
| SizeTy, llvmAType->getNumElements())); |
| Type = AType->getElementType(); |
| } |
| |
| return llvm::ConstantInt::get(SizeTy, AllocSize.getQuantity()); |
| } |
| |
| // Emit the array size expression. |
| NumElements = CGF.EmitScalarExpr(E->getArraySize()); |
| |
| // Multiply with the type size. |
| llvm::Value *V = |
| CGF.Builder.CreateMul(NumElements, |
| llvm::ConstantInt::get(SizeTy, |
| TypeSize.getQuantity())); |
| |
| while (const ArrayType *AType = Context.getAsArrayType(Type)) { |
| const llvm::ArrayType *llvmAType = |
| cast<llvm::ArrayType>(CGF.ConvertType(Type)); |
| NumElements = |
| CGF.Builder.CreateMul(NumElements, |
| llvm::ConstantInt::get( |
| SizeTy, llvmAType->getNumElements())); |
| Type = AType->getElementType(); |
| } |
| |
| // And add the cookie padding if necessary. |
| if (!CookiePadding.isZero()) |
| V = CGF.Builder.CreateAdd(V, |
| llvm::ConstantInt::get(SizeTy, CookiePadding.getQuantity())); |
| |
| return V; |
| } |
| |
| static void StoreAnyExprIntoOneUnit(CodeGenFunction &CGF, const CXXNewExpr *E, |
| llvm::Value *NewPtr) { |
| |
| assert(E->getNumConstructorArgs() == 1 && |
| "Can only have one argument to initializer of POD type."); |
| |
| const Expr *Init = E->getConstructorArg(0); |
| QualType AllocType = E->getAllocatedType(); |
| |
| if (!CGF.hasAggregateLLVMType(AllocType)) |
| CGF.EmitStoreOfScalar(CGF.EmitScalarExpr(Init), NewPtr, |
| AllocType.isVolatileQualified(), AllocType); |
| else if (AllocType->isAnyComplexType()) |
| CGF.EmitComplexExprIntoAddr(Init, NewPtr, |
| AllocType.isVolatileQualified()); |
| else |
| CGF.EmitAggExpr(Init, NewPtr, AllocType.isVolatileQualified()); |
| } |
| |
| void |
| CodeGenFunction::EmitNewArrayInitializer(const CXXNewExpr *E, |
| llvm::Value *NewPtr, |
| llvm::Value *NumElements) { |
| // We have a POD type. |
| if (E->getNumConstructorArgs() == 0) |
| return; |
| |
| 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(NewPtr, Counter, |
| "arrayidx"); |
| StoreAnyExprIntoOneUnit(*this, E, Address); |
| |
| 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); |
| } |
| |
| static void EmitNewInitializer(CodeGenFunction &CGF, const CXXNewExpr *E, |
| llvm::Value *NewPtr, |
| llvm::Value *NumElements) { |
| if (E->isArray()) { |
| if (CXXConstructorDecl *Ctor = E->getConstructor()) { |
| if (!Ctor->getParent()->hasTrivialConstructor()) |
| CGF.EmitCXXAggrConstructorCall(Ctor, NumElements, NewPtr, |
| E->constructor_arg_begin(), |
| E->constructor_arg_end()); |
| return; |
| } |
| else { |
| CGF.EmitNewArrayInitializer(E, NewPtr, NumElements); |
| return; |
| } |
| } |
| |
| if (CXXConstructorDecl *Ctor = E->getConstructor()) { |
| CGF.EmitCXXConstructorCall(Ctor, Ctor_Complete, /*ForVirtualBase=*/false, |
| NewPtr, E->constructor_arg_begin(), |
| E->constructor_arg_end()); |
| |
| return; |
| } |
| // We have a POD type. |
| if (E->getNumConstructorArgs() == 0) |
| return; |
| |
| StoreAnyExprIntoOneUnit(CGF, E, NewPtr); |
| } |
| |
| llvm::Value *CodeGenFunction::EmitCXXNewExpr(const CXXNewExpr *E) { |
| QualType AllocType = E->getAllocatedType(); |
| FunctionDecl *NewFD = E->getOperatorNew(); |
| const FunctionProtoType *NewFTy = NewFD->getType()->getAs<FunctionProtoType>(); |
| |
| CallArgList NewArgs; |
| |
| // The allocation size is the first argument. |
| QualType SizeTy = getContext().getSizeType(); |
| |
| llvm::Value *NumElements = 0; |
| llvm::Value *AllocSize = EmitCXXNewAllocSize(getContext(), |
| *this, E, NumElements); |
| |
| NewArgs.push_back(std::make_pair(RValue::get(AllocSize), SizeTy)); |
| |
| // Emit the rest of the arguments. |
| // FIXME: Ideally, this should just use EmitCallArgs. |
| CXXNewExpr::const_arg_iterator NewArg = E->placement_arg_begin(); |
| |
| // First, use the types from the function type. |
| // We start at 1 here because the first argument (the allocation size) |
| // has already been emitted. |
| for (unsigned i = 1, e = NewFTy->getNumArgs(); i != e; ++i, ++NewArg) { |
| QualType ArgType = NewFTy->getArgType(i); |
| |
| assert(getContext().getCanonicalType(ArgType.getNonReferenceType()). |
| getTypePtr() == |
| getContext().getCanonicalType(NewArg->getType()).getTypePtr() && |
| "type mismatch in call argument!"); |
| |
| NewArgs.push_back(std::make_pair(EmitCallArg(*NewArg, ArgType), |
| ArgType)); |
| |
| } |
| |
| // Either we've emitted all the call args, or we have a call to a |
| // variadic function. |
| assert((NewArg == E->placement_arg_end() || NewFTy->isVariadic()) && |
| "Extra arguments in non-variadic function!"); |
| |
| // If we still have any arguments, emit them using the type of the argument. |
| for (CXXNewExpr::const_arg_iterator NewArgEnd = E->placement_arg_end(); |
| NewArg != NewArgEnd; ++NewArg) { |
| QualType ArgType = NewArg->getType(); |
| NewArgs.push_back(std::make_pair(EmitCallArg(*NewArg, ArgType), |
| ArgType)); |
| } |
| |
| // Emit the call to new. |
| RValue RV = |
| EmitCall(CGM.getTypes().getFunctionInfo(NewArgs, NewFTy), |
| CGM.GetAddrOfFunction(NewFD), ReturnValueSlot(), NewArgs, NewFD); |
| |
| // If an allocation function is declared with an empty exception specification |
| // it returns null to indicate failure to allocate storage. [expr.new]p13. |
| // (We don't need to check for null when there's no new initializer and |
| // we're allocating a POD type). |
| bool NullCheckResult = NewFTy->hasEmptyExceptionSpec() && |
| !(AllocType->isPODType() && !E->hasInitializer()); |
| |
| llvm::BasicBlock *NewNull = 0; |
| llvm::BasicBlock *NewNotNull = 0; |
| llvm::BasicBlock *NewEnd = 0; |
| |
| llvm::Value *NewPtr = RV.getScalarVal(); |
| |
| if (NullCheckResult) { |
| NewNull = createBasicBlock("new.null"); |
| NewNotNull = createBasicBlock("new.notnull"); |
| NewEnd = createBasicBlock("new.end"); |
| |
| llvm::Value *IsNull = |
| Builder.CreateICmpEQ(NewPtr, |
| llvm::Constant::getNullValue(NewPtr->getType()), |
| "isnull"); |
| |
| Builder.CreateCondBr(IsNull, NewNull, NewNotNull); |
| EmitBlock(NewNotNull); |
| } |
| |
| CharUnits CookiePadding = CalculateCookiePadding(getContext(), E); |
| if (!CookiePadding.isZero()) { |
| CharUnits CookieOffset = |
| CookiePadding - getContext().getTypeSizeInChars(SizeTy); |
| |
| llvm::Value *NumElementsPtr = |
| Builder.CreateConstInBoundsGEP1_64(NewPtr, CookieOffset.getQuantity()); |
| |
| NumElementsPtr = Builder.CreateBitCast(NumElementsPtr, |
| ConvertType(SizeTy)->getPointerTo()); |
| Builder.CreateStore(NumElements, NumElementsPtr); |
| |
| // Now add the padding to the new ptr. |
| NewPtr = Builder.CreateConstInBoundsGEP1_64(NewPtr, |
| CookiePadding.getQuantity()); |
| } |
| |
| if (AllocType->isArrayType()) { |
| while (const ArrayType *AType = getContext().getAsArrayType(AllocType)) |
| AllocType = AType->getElementType(); |
| NewPtr = |
| Builder.CreateBitCast(NewPtr, |
| ConvertType(getContext().getPointerType(AllocType))); |
| EmitNewInitializer(*this, E, NewPtr, NumElements); |
| NewPtr = Builder.CreateBitCast(NewPtr, ConvertType(E->getType())); |
| } |
| else { |
| NewPtr = Builder.CreateBitCast(NewPtr, ConvertType(E->getType())); |
| EmitNewInitializer(*this, E, NewPtr, NumElements); |
| } |
| |
| if (NullCheckResult) { |
| Builder.CreateBr(NewEnd); |
| NewNotNull = Builder.GetInsertBlock(); |
| EmitBlock(NewNull); |
| Builder.CreateBr(NewEnd); |
| EmitBlock(NewEnd); |
| |
| llvm::PHINode *PHI = Builder.CreatePHI(NewPtr->getType()); |
| PHI->reserveOperandSpace(2); |
| PHI->addIncoming(NewPtr, NewNotNull); |
| PHI->addIncoming(llvm::Constant::getNullValue(NewPtr->getType()), NewNull); |
| |
| NewPtr = PHI; |
| } |
| |
| return NewPtr; |
| } |
| |
| static std::pair<llvm::Value *, llvm::Value *> |
| GetAllocatedObjectPtrAndNumElements(CodeGenFunction &CGF, |
| llvm::Value *Ptr, QualType DeleteTy) { |
| QualType SizeTy = CGF.getContext().getSizeType(); |
| const llvm::Type *SizeLTy = CGF.ConvertType(SizeTy); |
| |
| CharUnits DeleteTypeAlign = CGF.getContext().getTypeAlignInChars(DeleteTy); |
| CharUnits CookiePadding = |
| std::max(CGF.getContext().getTypeSizeInChars(SizeTy), |
| DeleteTypeAlign); |
| assert(!CookiePadding.isZero() && "CookiePadding should not be 0."); |
| |
| const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| CharUnits CookieOffset = |
| CookiePadding - CGF.getContext().getTypeSizeInChars(SizeTy); |
| |
| llvm::Value *AllocatedObjectPtr = CGF.Builder.CreateBitCast(Ptr, Int8PtrTy); |
| AllocatedObjectPtr = |
| CGF.Builder.CreateConstInBoundsGEP1_64(AllocatedObjectPtr, |
| -CookiePadding.getQuantity()); |
| |
| llvm::Value *NumElementsPtr = |
| CGF.Builder.CreateConstInBoundsGEP1_64(AllocatedObjectPtr, |
| CookieOffset.getQuantity()); |
| NumElementsPtr = |
| CGF.Builder.CreateBitCast(NumElementsPtr, SizeLTy->getPointerTo()); |
| |
| llvm::Value *NumElements = CGF.Builder.CreateLoad(NumElementsPtr); |
| NumElements = |
| CGF.Builder.CreateIntCast(NumElements, SizeLTy, /*isSigned=*/false); |
| |
| return std::make_pair(AllocatedObjectPtr, NumElements); |
| } |
| |
| void CodeGenFunction::EmitDeleteCall(const FunctionDecl *DeleteFD, |
| llvm::Value *Ptr, |
| QualType DeleteTy) { |
| const FunctionProtoType *DeleteFTy = |
| DeleteFD->getType()->getAs<FunctionProtoType>(); |
| |
| CallArgList DeleteArgs; |
| |
| // Check if we need to pass the size to the delete operator. |
| llvm::Value *Size = 0; |
| QualType SizeTy; |
| if (DeleteFTy->getNumArgs() == 2) { |
| SizeTy = DeleteFTy->getArgType(1); |
| CharUnits DeleteTypeSize = getContext().getTypeSizeInChars(DeleteTy); |
| Size = llvm::ConstantInt::get(ConvertType(SizeTy), |
| DeleteTypeSize.getQuantity()); |
| } |
| |
| if (DeleteFD->getOverloadedOperator() == OO_Array_Delete && |
| !CalculateCookiePadding(getContext(), DeleteTy).isZero()) { |
| // We need to get the number of elements in the array from the cookie. |
| llvm::Value *AllocatedObjectPtr; |
| llvm::Value *NumElements; |
| llvm::tie(AllocatedObjectPtr, NumElements) = |
| GetAllocatedObjectPtrAndNumElements(*this, Ptr, DeleteTy); |
| |
| // Multiply the size with the number of elements. |
| if (Size) |
| Size = Builder.CreateMul(NumElements, Size); |
| |
| Ptr = AllocatedObjectPtr; |
| } |
| |
| QualType ArgTy = DeleteFTy->getArgType(0); |
| llvm::Value *DeletePtr = Builder.CreateBitCast(Ptr, ConvertType(ArgTy)); |
| DeleteArgs.push_back(std::make_pair(RValue::get(DeletePtr), ArgTy)); |
| |
| if (Size) |
| DeleteArgs.push_back(std::make_pair(RValue::get(Size), SizeTy)); |
| |
| // Emit the call to delete. |
| EmitCall(CGM.getTypes().getFunctionInfo(DeleteArgs, DeleteFTy), |
| CGM.GetAddrOfFunction(DeleteFD), ReturnValueSlot(), |
| DeleteArgs, DeleteFD); |
| } |
| |
| void CodeGenFunction::EmitCXXDeleteExpr(const CXXDeleteExpr *E) { |
| |
| // Get at the argument before we performed the implicit conversion |
| // to void*. |
| const Expr *Arg = E->getArgument(); |
| while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg)) { |
| if (ICE->getCastKind() != CastExpr::CK_UserDefinedConversion && |
| ICE->getType()->isVoidPointerType()) |
| Arg = ICE->getSubExpr(); |
| else |
| break; |
| } |
| |
| QualType DeleteTy = Arg->getType()->getAs<PointerType>()->getPointeeType(); |
| |
| llvm::Value *Ptr = EmitScalarExpr(Arg); |
| |
| // Null check the pointer. |
| llvm::BasicBlock *DeleteNotNull = createBasicBlock("delete.notnull"); |
| llvm::BasicBlock *DeleteEnd = createBasicBlock("delete.end"); |
| |
| llvm::Value *IsNull = |
| Builder.CreateICmpEQ(Ptr, llvm::Constant::getNullValue(Ptr->getType()), |
| "isnull"); |
| |
| Builder.CreateCondBr(IsNull, DeleteEnd, DeleteNotNull); |
| EmitBlock(DeleteNotNull); |
| |
| bool ShouldCallDelete = true; |
| |
| // Call the destructor if necessary. |
| if (const RecordType *RT = DeleteTy->getAs<RecordType>()) { |
| if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { |
| if (!RD->hasTrivialDestructor()) { |
| const CXXDestructorDecl *Dtor = RD->getDestructor(getContext()); |
| if (E->isArrayForm()) { |
| llvm::Value *AllocatedObjectPtr; |
| llvm::Value *NumElements; |
| llvm::tie(AllocatedObjectPtr, NumElements) = |
| GetAllocatedObjectPtrAndNumElements(*this, Ptr, DeleteTy); |
| |
| EmitCXXAggrDestructorCall(Dtor, NumElements, Ptr); |
| } else if (Dtor->isVirtual()) { |
| const llvm::Type *Ty = |
| CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(Dtor), |
| /*isVariadic=*/false); |
| |
| llvm::Value *Callee = BuildVirtualCall(Dtor, Dtor_Deleting, Ptr, Ty); |
| EmitCXXMemberCall(Dtor, Callee, ReturnValueSlot(), Ptr, /*VTT=*/0, |
| 0, 0); |
| |
| // The dtor took care of deleting the object. |
| ShouldCallDelete = false; |
| } else |
| EmitCXXDestructorCall(Dtor, Dtor_Complete, /*ForVirtualBase=*/false, |
| Ptr); |
| } |
| } |
| } |
| |
| if (ShouldCallDelete) |
| EmitDeleteCall(E->getOperatorDelete(), Ptr, DeleteTy); |
| |
| EmitBlock(DeleteEnd); |
| } |
| |
| llvm::Value * CodeGenFunction::EmitCXXTypeidExpr(const CXXTypeidExpr *E) { |
| QualType Ty = E->getType(); |
| const llvm::Type *LTy = ConvertType(Ty)->getPointerTo(); |
| |
| if (E->isTypeOperand()) { |
| llvm::Constant *TypeInfo = |
| CGM.GetAddrOfRTTIDescriptor(E->getTypeOperand()); |
| return Builder.CreateBitCast(TypeInfo, LTy); |
| } |
| |
| Expr *subE = E->getExprOperand(); |
| Ty = subE->getType(); |
| CanQualType CanTy = CGM.getContext().getCanonicalType(Ty); |
| Ty = CanTy.getUnqualifiedType().getNonReferenceType(); |
| if (const RecordType *RT = Ty->getAs<RecordType>()) { |
| const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| if (RD->isPolymorphic()) { |
| // FIXME: if subE is an lvalue do |
| LValue Obj = EmitLValue(subE); |
| llvm::Value *This = Obj.getAddress(); |
| LTy = LTy->getPointerTo()->getPointerTo(); |
| llvm::Value *V = Builder.CreateBitCast(This, LTy); |
| // We need to do a zero check for *p, unless it has NonNullAttr. |
| // FIXME: PointerType->hasAttr<NonNullAttr>() |
| bool CanBeZero = false; |
| if (UnaryOperator *UO = dyn_cast<UnaryOperator>(subE->IgnoreParens())) |
| if (UO->getOpcode() == UnaryOperator::Deref) |
| CanBeZero = true; |
| if (CanBeZero) { |
| llvm::BasicBlock *NonZeroBlock = createBasicBlock(); |
| llvm::BasicBlock *ZeroBlock = createBasicBlock(); |
| |
| llvm::Value *Zero = llvm::Constant::getNullValue(LTy); |
| Builder.CreateCondBr(Builder.CreateICmpNE(V, Zero), |
| NonZeroBlock, ZeroBlock); |
| EmitBlock(ZeroBlock); |
| /// Call __cxa_bad_typeid |
| const llvm::Type *ResultType = llvm::Type::getVoidTy(VMContext); |
| const llvm::FunctionType *FTy; |
| FTy = llvm::FunctionType::get(ResultType, false); |
| llvm::Value *F = CGM.CreateRuntimeFunction(FTy, "__cxa_bad_typeid"); |
| Builder.CreateCall(F)->setDoesNotReturn(); |
| Builder.CreateUnreachable(); |
| EmitBlock(NonZeroBlock); |
| } |
| V = Builder.CreateLoad(V, "vtable"); |
| V = Builder.CreateConstInBoundsGEP1_64(V, -1ULL); |
| V = Builder.CreateLoad(V); |
| return V; |
| } |
| } |
| return Builder.CreateBitCast(CGM.GetAddrOfRTTIDescriptor(Ty), LTy); |
| } |
| |
| llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *V, |
| const CXXDynamicCastExpr *DCE) { |
| QualType SrcTy = DCE->getSubExpr()->getType(); |
| QualType DestTy = DCE->getTypeAsWritten(); |
| QualType InnerType = DestTy->getPointeeType(); |
| |
| const llvm::Type *LTy = ConvertType(DCE->getType()); |
| |
| bool CanBeZero = false; |
| bool ToVoid = false; |
| bool ThrowOnBad = false; |
| if (DestTy->isPointerType()) { |
| // FIXME: if PointerType->hasAttr<NonNullAttr>(), we don't set this |
| CanBeZero = true; |
| if (InnerType->isVoidType()) |
| ToVoid = true; |
| } else { |
| LTy = LTy->getPointerTo(); |
| |
| // FIXME: What if exceptions are disabled? |
| ThrowOnBad = true; |
| } |
| |
| if (SrcTy->isPointerType() || SrcTy->isReferenceType()) |
| SrcTy = SrcTy->getPointeeType(); |
| SrcTy = SrcTy.getUnqualifiedType(); |
| |
| if (DestTy->isPointerType() || DestTy->isReferenceType()) |
| DestTy = DestTy->getPointeeType(); |
| DestTy = DestTy.getUnqualifiedType(); |
| |
| llvm::BasicBlock *ContBlock = createBasicBlock(); |
| llvm::BasicBlock *NullBlock = 0; |
| llvm::BasicBlock *NonZeroBlock = 0; |
| if (CanBeZero) { |
| NonZeroBlock = createBasicBlock(); |
| NullBlock = createBasicBlock(); |
| Builder.CreateCondBr(Builder.CreateIsNotNull(V), NonZeroBlock, NullBlock); |
| EmitBlock(NonZeroBlock); |
| } |
| |
| llvm::BasicBlock *BadCastBlock = 0; |
| |
| const llvm::Type *PtrDiffTy = ConvertType(getContext().getPointerDiffType()); |
| |
| // See if this is a dynamic_cast(void*) |
| if (ToVoid) { |
| llvm::Value *This = V; |
| V = Builder.CreateBitCast(This, PtrDiffTy->getPointerTo()->getPointerTo()); |
| V = Builder.CreateLoad(V, "vtable"); |
| V = Builder.CreateConstInBoundsGEP1_64(V, -2ULL); |
| V = Builder.CreateLoad(V, "offset to top"); |
| This = Builder.CreateBitCast(This, llvm::Type::getInt8PtrTy(VMContext)); |
| V = Builder.CreateInBoundsGEP(This, V); |
| V = Builder.CreateBitCast(V, LTy); |
| } else { |
| /// Call __dynamic_cast |
| const llvm::Type *ResultType = llvm::Type::getInt8PtrTy(VMContext); |
| const llvm::FunctionType *FTy; |
| std::vector<const llvm::Type*> ArgTys; |
| const llvm::Type *PtrToInt8Ty |
| = llvm::Type::getInt8Ty(VMContext)->getPointerTo(); |
| ArgTys.push_back(PtrToInt8Ty); |
| ArgTys.push_back(PtrToInt8Ty); |
| ArgTys.push_back(PtrToInt8Ty); |
| ArgTys.push_back(PtrDiffTy); |
| FTy = llvm::FunctionType::get(ResultType, ArgTys, false); |
| |
| // FIXME: Calculate better hint. |
| llvm::Value *hint = llvm::ConstantInt::get(PtrDiffTy, -1ULL); |
| |
| assert(SrcTy->isRecordType() && "Src type must be record type!"); |
| assert(DestTy->isRecordType() && "Dest type must be record type!"); |
| |
| llvm::Value *SrcArg |
| = CGM.GetAddrOfRTTIDescriptor(SrcTy.getUnqualifiedType()); |
| llvm::Value *DestArg |
| = CGM.GetAddrOfRTTIDescriptor(DestTy.getUnqualifiedType()); |
| |
| V = Builder.CreateBitCast(V, PtrToInt8Ty); |
| V = Builder.CreateCall4(CGM.CreateRuntimeFunction(FTy, "__dynamic_cast"), |
| V, SrcArg, DestArg, hint); |
| V = Builder.CreateBitCast(V, LTy); |
| |
| if (ThrowOnBad) { |
| BadCastBlock = createBasicBlock(); |
| Builder.CreateCondBr(Builder.CreateIsNotNull(V), ContBlock, BadCastBlock); |
| EmitBlock(BadCastBlock); |
| /// Invoke __cxa_bad_cast |
| ResultType = llvm::Type::getVoidTy(VMContext); |
| const llvm::FunctionType *FBadTy; |
| FBadTy = llvm::FunctionType::get(ResultType, false); |
| llvm::Value *F = CGM.CreateRuntimeFunction(FBadTy, "__cxa_bad_cast"); |
| if (llvm::BasicBlock *InvokeDest = getInvokeDest()) { |
| llvm::BasicBlock *Cont = createBasicBlock("invoke.cont"); |
| Builder.CreateInvoke(F, Cont, InvokeDest)->setDoesNotReturn(); |
| EmitBlock(Cont); |
| } else { |
| // FIXME: Does this ever make sense? |
| Builder.CreateCall(F)->setDoesNotReturn(); |
| } |
| Builder.CreateUnreachable(); |
| } |
| } |
| |
| if (CanBeZero) { |
| Builder.CreateBr(ContBlock); |
| EmitBlock(NullBlock); |
| Builder.CreateBr(ContBlock); |
| } |
| EmitBlock(ContBlock); |
| if (CanBeZero) { |
| llvm::PHINode *PHI = Builder.CreatePHI(LTy); |
| PHI->reserveOperandSpace(2); |
| PHI->addIncoming(V, NonZeroBlock); |
| PHI->addIncoming(llvm::Constant::getNullValue(LTy), NullBlock); |
| V = PHI; |
| } |
| |
| return V; |
| } |