forked from OSchip/llvm-project
458 lines
18 KiB
C++
458 lines
18 KiB
C++
//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code dealing with C++ code generation.
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//
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//===----------------------------------------------------------------------===//
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// We might split this into multiple files if it gets too unwieldy
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "Mangle.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/StmtCXX.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace clang;
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using namespace CodeGen;
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llvm::Value *CodeGenFunction::LoadCXXThis() {
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assert(isa<CXXMethodDecl>(CurFuncDecl) &&
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"Must be in a C++ member function decl to load 'this'");
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assert(cast<CXXMethodDecl>(CurFuncDecl)->isInstance() &&
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"Must be in a C++ member function decl to load 'this'");
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// FIXME: What if we're inside a block?
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// ans: See how CodeGenFunction::LoadObjCSelf() uses
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// CodeGenFunction::BlockForwardSelf() for how to do this.
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return Builder.CreateLoad(LocalDeclMap[CXXThisDecl], "this");
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}
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void CodeGenModule::EmitCXXConstructors(const CXXConstructorDecl *D) {
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EmitGlobal(GlobalDecl(D, Ctor_Complete));
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EmitGlobal(GlobalDecl(D, Ctor_Base));
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}
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void CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D,
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CXXCtorType Type) {
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llvm::Function *Fn = GetAddrOfCXXConstructor(D, Type);
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CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn);
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SetFunctionDefinitionAttributes(D, Fn);
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SetLLVMFunctionAttributesForDefinition(D, Fn);
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}
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llvm::Function *
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CodeGenModule::GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
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CXXCtorType Type) {
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const FunctionProtoType *FPT = D->getType()->getAs<FunctionProtoType>();
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const llvm::FunctionType *FTy =
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getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type),
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FPT->isVariadic());
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const char *Name = getMangledCXXCtorName(D, Type);
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return cast<llvm::Function>(
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GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type)));
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}
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const char *CodeGenModule::getMangledCXXCtorName(const CXXConstructorDecl *D,
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CXXCtorType Type) {
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llvm::SmallString<256> Name;
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getMangleContext().mangleCXXCtor(D, Type, Name);
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Name += '\0';
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return UniqueMangledName(Name.begin(), Name.end());
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}
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void CodeGenModule::EmitCXXDestructors(const CXXDestructorDecl *D) {
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if (D->isVirtual())
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EmitGlobal(GlobalDecl(D, Dtor_Deleting));
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EmitGlobal(GlobalDecl(D, Dtor_Complete));
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EmitGlobal(GlobalDecl(D, Dtor_Base));
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}
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void CodeGenModule::EmitCXXDestructor(const CXXDestructorDecl *D,
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CXXDtorType Type) {
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llvm::Function *Fn = GetAddrOfCXXDestructor(D, Type);
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CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn);
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SetFunctionDefinitionAttributes(D, Fn);
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SetLLVMFunctionAttributesForDefinition(D, Fn);
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}
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llvm::Function *
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CodeGenModule::GetAddrOfCXXDestructor(const CXXDestructorDecl *D,
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CXXDtorType Type) {
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const llvm::FunctionType *FTy =
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getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type), false);
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const char *Name = getMangledCXXDtorName(D, Type);
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return cast<llvm::Function>(
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GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type)));
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}
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const char *CodeGenModule::getMangledCXXDtorName(const CXXDestructorDecl *D,
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CXXDtorType Type) {
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llvm::SmallString<256> Name;
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getMangleContext().mangleCXXDtor(D, Type, Name);
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Name += '\0';
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return UniqueMangledName(Name.begin(), Name.end());
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}
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llvm::Constant *
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CodeGenFunction::GenerateThunk(llvm::Function *Fn, GlobalDecl GD,
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bool Extern,
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const ThunkAdjustment &ThisAdjustment) {
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return GenerateCovariantThunk(Fn, GD, Extern,
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CovariantThunkAdjustment(ThisAdjustment,
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ThunkAdjustment()));
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}
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llvm::Value *
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CodeGenFunction::DynamicTypeAdjust(llvm::Value *V,
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const ThunkAdjustment &Adjustment) {
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const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
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const llvm::Type *OrigTy = V->getType();
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if (Adjustment.NonVirtual) {
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// Do the non-virtual adjustment
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V = Builder.CreateBitCast(V, Int8PtrTy);
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V = Builder.CreateConstInBoundsGEP1_64(V, Adjustment.NonVirtual);
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V = Builder.CreateBitCast(V, OrigTy);
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}
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if (!Adjustment.Virtual)
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return V;
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assert(Adjustment.Virtual % (LLVMPointerWidth / 8) == 0 &&
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"vtable entry unaligned");
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// Do the virtual this adjustment
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const llvm::Type *PtrDiffTy = ConvertType(getContext().getPointerDiffType());
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const llvm::Type *PtrDiffPtrTy = PtrDiffTy->getPointerTo();
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llvm::Value *ThisVal = Builder.CreateBitCast(V, Int8PtrTy);
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V = Builder.CreateBitCast(V, PtrDiffPtrTy->getPointerTo());
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V = Builder.CreateLoad(V, "vtable");
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llvm::Value *VTablePtr = V;
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uint64_t VirtualAdjustment = Adjustment.Virtual / (LLVMPointerWidth / 8);
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V = Builder.CreateConstInBoundsGEP1_64(VTablePtr, VirtualAdjustment);
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V = Builder.CreateLoad(V);
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V = Builder.CreateGEP(ThisVal, V);
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return Builder.CreateBitCast(V, OrigTy);
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}
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llvm::Constant *
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CodeGenFunction::GenerateCovariantThunk(llvm::Function *Fn,
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GlobalDecl GD, bool Extern,
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const CovariantThunkAdjustment &Adjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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QualType ResultType = MD->getType()->getAs<FunctionType>()->getResultType();
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FunctionArgList Args;
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ImplicitParamDecl *ThisDecl =
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ImplicitParamDecl::Create(getContext(), 0, SourceLocation(), 0,
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MD->getThisType(getContext()));
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Args.push_back(std::make_pair(ThisDecl, ThisDecl->getType()));
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for (FunctionDecl::param_const_iterator i = MD->param_begin(),
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e = MD->param_end();
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i != e; ++i) {
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ParmVarDecl *D = *i;
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Args.push_back(std::make_pair(D, D->getType()));
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}
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IdentifierInfo *II
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= &CGM.getContext().Idents.get("__thunk_named_foo_");
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FunctionDecl *FD = FunctionDecl::Create(getContext(),
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getContext().getTranslationUnitDecl(),
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SourceLocation(), II, ResultType, 0,
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Extern
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? FunctionDecl::Extern
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: FunctionDecl::Static,
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false, true);
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StartFunction(FD, ResultType, Fn, Args, SourceLocation());
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// generate body
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const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
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const llvm::Type *Ty =
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CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD),
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FPT->isVariadic());
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llvm::Value *Callee = CGM.GetAddrOfFunction(GD, Ty);
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CallArgList CallArgs;
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bool ShouldAdjustReturnPointer = true;
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QualType ArgType = MD->getThisType(getContext());
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llvm::Value *Arg = Builder.CreateLoad(LocalDeclMap[ThisDecl], "this");
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if (!Adjustment.ThisAdjustment.isEmpty()) {
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// Do the this adjustment.
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const llvm::Type *OrigTy = Callee->getType();
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Arg = DynamicTypeAdjust(Arg, Adjustment.ThisAdjustment);
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if (!Adjustment.ReturnAdjustment.isEmpty()) {
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const CovariantThunkAdjustment &ReturnAdjustment =
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CovariantThunkAdjustment(ThunkAdjustment(),
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Adjustment.ReturnAdjustment);
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Callee = CGM.BuildCovariantThunk(GD, Extern, ReturnAdjustment);
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Callee = Builder.CreateBitCast(Callee, OrigTy);
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ShouldAdjustReturnPointer = false;
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}
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}
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CallArgs.push_back(std::make_pair(RValue::get(Arg), ArgType));
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for (FunctionDecl::param_const_iterator i = MD->param_begin(),
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e = MD->param_end();
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i != e; ++i) {
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ParmVarDecl *D = *i;
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QualType ArgType = D->getType();
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// llvm::Value *Arg = CGF.GetAddrOfLocalVar(Dst);
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Expr *Arg = new (getContext()) DeclRefExpr(D, ArgType.getNonReferenceType(),
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SourceLocation());
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CallArgs.push_back(std::make_pair(EmitCallArg(Arg, ArgType), ArgType));
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}
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RValue RV = EmitCall(CGM.getTypes().getFunctionInfo(ResultType, CallArgs),
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Callee, ReturnValueSlot(), CallArgs, MD);
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if (ShouldAdjustReturnPointer && !Adjustment.ReturnAdjustment.isEmpty()) {
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bool CanBeZero = !(ResultType->isReferenceType()
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// FIXME: attr nonnull can't be zero either
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/* || ResultType->hasAttr<NonNullAttr>() */ );
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// Do the return result adjustment.
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if (CanBeZero) {
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llvm::BasicBlock *NonZeroBlock = createBasicBlock();
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llvm::BasicBlock *ZeroBlock = createBasicBlock();
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llvm::BasicBlock *ContBlock = createBasicBlock();
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const llvm::Type *Ty = RV.getScalarVal()->getType();
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llvm::Value *Zero = llvm::Constant::getNullValue(Ty);
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Builder.CreateCondBr(Builder.CreateICmpNE(RV.getScalarVal(), Zero),
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NonZeroBlock, ZeroBlock);
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EmitBlock(NonZeroBlock);
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llvm::Value *NZ =
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DynamicTypeAdjust(RV.getScalarVal(), Adjustment.ReturnAdjustment);
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EmitBranch(ContBlock);
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EmitBlock(ZeroBlock);
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llvm::Value *Z = RV.getScalarVal();
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EmitBlock(ContBlock);
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llvm::PHINode *RVOrZero = Builder.CreatePHI(Ty);
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RVOrZero->reserveOperandSpace(2);
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RVOrZero->addIncoming(NZ, NonZeroBlock);
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RVOrZero->addIncoming(Z, ZeroBlock);
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RV = RValue::get(RVOrZero);
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} else
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RV = RValue::get(DynamicTypeAdjust(RV.getScalarVal(),
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Adjustment.ReturnAdjustment));
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}
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if (!ResultType->isVoidType())
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EmitReturnOfRValue(RV, ResultType);
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FinishFunction();
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return Fn;
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}
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llvm::Constant *
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CodeGenModule::GetAddrOfThunk(GlobalDecl GD,
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const ThunkAdjustment &ThisAdjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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// Compute mangled name
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llvm::SmallString<256> OutName;
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if (const CXXDestructorDecl* DD = dyn_cast<CXXDestructorDecl>(MD))
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getMangleContext().mangleCXXDtorThunk(DD, GD.getDtorType(), ThisAdjustment,
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OutName);
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else
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getMangleContext().mangleThunk(MD, ThisAdjustment, OutName);
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OutName += '\0';
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const char* Name = UniqueMangledName(OutName.begin(), OutName.end());
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// Get function for mangled name
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const llvm::Type *Ty = getTypes().GetFunctionTypeForVtable(MD);
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return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl());
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}
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llvm::Constant *
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CodeGenModule::GetAddrOfCovariantThunk(GlobalDecl GD,
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const CovariantThunkAdjustment &Adjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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// Compute mangled name
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llvm::SmallString<256> OutName;
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getMangleContext().mangleCovariantThunk(MD, Adjustment, OutName);
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OutName += '\0';
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const char* Name = UniqueMangledName(OutName.begin(), OutName.end());
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// Get function for mangled name
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const llvm::Type *Ty = getTypes().GetFunctionTypeForVtable(MD);
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return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl());
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}
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void CodeGenModule::BuildThunksForVirtual(GlobalDecl GD) {
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CGVtableInfo::AdjustmentVectorTy *AdjPtr = getVtableInfo().getAdjustments(GD);
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if (!AdjPtr)
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return;
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CGVtableInfo::AdjustmentVectorTy &Adj = *AdjPtr;
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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for (unsigned i = 0; i < Adj.size(); i++) {
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GlobalDecl OGD = Adj[i].first;
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const CXXMethodDecl *OMD = cast<CXXMethodDecl>(OGD.getDecl());
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QualType nc_oret = OMD->getType()->getAs<FunctionType>()->getResultType();
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CanQualType oret = getContext().getCanonicalType(nc_oret);
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QualType nc_ret = MD->getType()->getAs<FunctionType>()->getResultType();
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CanQualType ret = getContext().getCanonicalType(nc_ret);
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ThunkAdjustment ReturnAdjustment;
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if (oret != ret) {
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QualType qD = nc_ret->getPointeeType();
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QualType qB = nc_oret->getPointeeType();
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CXXRecordDecl *D = cast<CXXRecordDecl>(qD->getAs<RecordType>()->getDecl());
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CXXRecordDecl *B = cast<CXXRecordDecl>(qB->getAs<RecordType>()->getDecl());
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ReturnAdjustment = ComputeThunkAdjustment(D, B);
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}
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ThunkAdjustment ThisAdjustment = Adj[i].second;
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bool Extern = !cast<CXXRecordDecl>(OMD->getDeclContext())->isInAnonymousNamespace();
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if (!ReturnAdjustment.isEmpty() || !ThisAdjustment.isEmpty()) {
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CovariantThunkAdjustment CoAdj(ThisAdjustment, ReturnAdjustment);
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llvm::Constant *FnConst;
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if (!ReturnAdjustment.isEmpty())
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FnConst = GetAddrOfCovariantThunk(GD, CoAdj);
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else
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FnConst = GetAddrOfThunk(GD, ThisAdjustment);
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if (!isa<llvm::Function>(FnConst)) {
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llvm::Constant *SubExpr =
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cast<llvm::ConstantExpr>(FnConst)->getOperand(0);
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llvm::Function *OldFn = cast<llvm::Function>(SubExpr);
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std::string Name = OldFn->getNameStr();
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GlobalDeclMap.erase(UniqueMangledName(Name.data(),
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Name.data() + Name.size() + 1));
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llvm::Constant *NewFnConst;
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if (!ReturnAdjustment.isEmpty())
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NewFnConst = GetAddrOfCovariantThunk(GD, CoAdj);
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else
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NewFnConst = GetAddrOfThunk(GD, ThisAdjustment);
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llvm::Function *NewFn = cast<llvm::Function>(NewFnConst);
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NewFn->takeName(OldFn);
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llvm::Constant *NewPtrForOldDecl =
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llvm::ConstantExpr::getBitCast(NewFn, OldFn->getType());
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OldFn->replaceAllUsesWith(NewPtrForOldDecl);
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OldFn->eraseFromParent();
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FnConst = NewFn;
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}
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llvm::Function *Fn = cast<llvm::Function>(FnConst);
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if (Fn->isDeclaration()) {
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llvm::GlobalVariable::LinkageTypes linktype;
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linktype = llvm::GlobalValue::WeakAnyLinkage;
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if (!Extern)
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linktype = llvm::GlobalValue::InternalLinkage;
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Fn->setLinkage(linktype);
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if (!Features.Exceptions && !Features.ObjCNonFragileABI)
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Fn->addFnAttr(llvm::Attribute::NoUnwind);
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Fn->setAlignment(2);
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CodeGenFunction(*this).GenerateCovariantThunk(Fn, GD, Extern, CoAdj);
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}
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}
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}
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}
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llvm::Constant *
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CodeGenModule::BuildThunk(GlobalDecl GD, bool Extern,
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const ThunkAdjustment &ThisAdjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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llvm::SmallString<256> OutName;
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if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(MD)) {
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getMangleContext().mangleCXXDtorThunk(D, GD.getDtorType(), ThisAdjustment,
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OutName);
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} else
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getMangleContext().mangleThunk(MD, ThisAdjustment, OutName);
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llvm::GlobalVariable::LinkageTypes linktype;
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linktype = llvm::GlobalValue::WeakAnyLinkage;
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if (!Extern)
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linktype = llvm::GlobalValue::InternalLinkage;
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llvm::Type *Ptr8Ty=llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext),0);
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const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
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const llvm::FunctionType *FTy =
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getTypes().GetFunctionType(getTypes().getFunctionInfo(MD),
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FPT->isVariadic());
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llvm::Function *Fn = llvm::Function::Create(FTy, linktype, OutName.str(),
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&getModule());
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CodeGenFunction(*this).GenerateThunk(Fn, GD, Extern, ThisAdjustment);
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llvm::Constant *m = llvm::ConstantExpr::getBitCast(Fn, Ptr8Ty);
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return m;
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}
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llvm::Constant *
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CodeGenModule::BuildCovariantThunk(const GlobalDecl &GD, bool Extern,
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const CovariantThunkAdjustment &Adjustment) {
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const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
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llvm::SmallString<256> OutName;
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getMangleContext().mangleCovariantThunk(MD, Adjustment, OutName);
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llvm::GlobalVariable::LinkageTypes linktype;
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linktype = llvm::GlobalValue::WeakAnyLinkage;
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if (!Extern)
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linktype = llvm::GlobalValue::InternalLinkage;
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llvm::Type *Ptr8Ty=llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext),0);
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const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
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const llvm::FunctionType *FTy =
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getTypes().GetFunctionType(getTypes().getFunctionInfo(MD),
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FPT->isVariadic());
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llvm::Function *Fn = llvm::Function::Create(FTy, linktype, OutName.str(),
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&getModule());
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CodeGenFunction(*this).GenerateCovariantThunk(Fn, MD, Extern, Adjustment);
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llvm::Constant *m = llvm::ConstantExpr::getBitCast(Fn, Ptr8Ty);
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return m;
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}
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static llvm::Value *BuildVirtualCall(CodeGenFunction &CGF, uint64_t VtableIndex,
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llvm::Value *This, const llvm::Type *Ty) {
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Ty = Ty->getPointerTo()->getPointerTo()->getPointerTo();
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llvm::Value *Vtable = CGF.Builder.CreateBitCast(This, Ty);
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Vtable = CGF.Builder.CreateLoad(Vtable);
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llvm::Value *VFuncPtr =
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CGF.Builder.CreateConstInBoundsGEP1_64(Vtable, VtableIndex, "vfn");
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return CGF.Builder.CreateLoad(VFuncPtr);
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}
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llvm::Value *
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CodeGenFunction::BuildVirtualCall(const CXXMethodDecl *MD, llvm::Value *This,
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const llvm::Type *Ty) {
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MD = MD->getCanonicalDecl();
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uint64_t VtableIndex = CGM.getVtableInfo().getMethodVtableIndex(MD);
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return ::BuildVirtualCall(*this, VtableIndex, This, Ty);
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}
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llvm::Value *
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CodeGenFunction::BuildVirtualCall(const CXXDestructorDecl *DD, CXXDtorType Type,
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llvm::Value *&This, const llvm::Type *Ty) {
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DD = cast<CXXDestructorDecl>(DD->getCanonicalDecl());
|
|
uint64_t VtableIndex =
|
|
CGM.getVtableInfo().getMethodVtableIndex(GlobalDecl(DD, Type));
|
|
|
|
return ::BuildVirtualCall(*this, VtableIndex, This, Ty);
|
|
}
|