1941 lines
79 KiB
C++
1941 lines
79 KiB
C++
//===--- MicrosoftCXXABI.cpp - Emit LLVM Code from ASTs for a Module ------===//
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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 provides C++ code generation targeting the Microsoft Visual C++ ABI.
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// The class in this file generates structures that follow the Microsoft
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// Visual C++ ABI, which is actually not very well documented at all outside
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// of Microsoft.
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//
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//===----------------------------------------------------------------------===//
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#include "CGCXXABI.h"
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#include "CodeGenModule.h"
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#include "CGVTables.h"
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#include "MicrosoftVBTables.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/VTableBuilder.h"
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#include "llvm/ADT/StringSet.h"
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using namespace clang;
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using namespace CodeGen;
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namespace {
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class MicrosoftCXXABI : public CGCXXABI {
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public:
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MicrosoftCXXABI(CodeGenModule &CGM) : CGCXXABI(CGM) {}
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bool HasThisReturn(GlobalDecl GD) const;
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bool isReturnTypeIndirect(const CXXRecordDecl *RD) const {
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// Structures that are not C++03 PODs are always indirect.
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return !RD->isPOD();
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}
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RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const {
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if (RD->hasNonTrivialCopyConstructor() || RD->hasNonTrivialDestructor())
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return RAA_DirectInMemory;
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return RAA_Default;
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}
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StringRef GetPureVirtualCallName() { return "_purecall"; }
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// No known support for deleted functions in MSVC yet, so this choice is
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// arbitrary.
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StringRef GetDeletedVirtualCallName() { return "_purecall"; }
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bool isInlineInitializedStaticDataMemberLinkOnce() { return true; }
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llvm::Value *adjustToCompleteObject(CodeGenFunction &CGF,
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llvm::Value *ptr,
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QualType type);
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llvm::Value *GetVirtualBaseClassOffset(CodeGenFunction &CGF,
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llvm::Value *This,
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const CXXRecordDecl *ClassDecl,
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const CXXRecordDecl *BaseClassDecl);
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void BuildConstructorSignature(const CXXConstructorDecl *Ctor,
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CXXCtorType Type,
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CanQualType &ResTy,
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SmallVectorImpl<CanQualType> &ArgTys);
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llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
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const CXXRecordDecl *RD);
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void initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF,
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const CXXRecordDecl *RD);
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void EmitCXXConstructors(const CXXConstructorDecl *D);
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// Background on MSVC destructors
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// ==============================
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//
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// Both Itanium and MSVC ABIs have destructor variants. The variant names
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// roughly correspond in the following way:
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// Itanium Microsoft
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// Base -> no name, just ~Class
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// Complete -> vbase destructor
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// Deleting -> scalar deleting destructor
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// vector deleting destructor
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//
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// The base and complete destructors are the same as in Itanium, although the
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// complete destructor does not accept a VTT parameter when there are virtual
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// bases. A separate mechanism involving vtordisps is used to ensure that
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// virtual methods of destroyed subobjects are not called.
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//
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// The deleting destructors accept an i32 bitfield as a second parameter. Bit
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// 1 indicates if the memory should be deleted. Bit 2 indicates if the this
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// pointer points to an array. The scalar deleting destructor assumes that
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// bit 2 is zero, and therefore does not contain a loop.
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//
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// For virtual destructors, only one entry is reserved in the vftable, and it
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// always points to the vector deleting destructor. The vector deleting
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// destructor is the most general, so it can be used to destroy objects in
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// place, delete single heap objects, or delete arrays.
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//
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// A TU defining a non-inline destructor is only guaranteed to emit a base
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// destructor, and all of the other variants are emitted on an as-needed basis
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// in COMDATs. Because a non-base destructor can be emitted in a TU that
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// lacks a definition for the destructor, non-base destructors must always
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// delegate to or alias the base destructor.
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void BuildDestructorSignature(const CXXDestructorDecl *Dtor,
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CXXDtorType Type,
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CanQualType &ResTy,
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SmallVectorImpl<CanQualType> &ArgTys);
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/// Non-base dtors should be emitted as delegating thunks in this ABI.
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bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
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CXXDtorType DT) const {
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return DT != Dtor_Base;
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}
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void EmitCXXDestructors(const CXXDestructorDecl *D);
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const CXXRecordDecl *getThisArgumentTypeForMethod(const CXXMethodDecl *MD) {
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MD = MD->getCanonicalDecl();
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if (MD->isVirtual() && !isa<CXXDestructorDecl>(MD)) {
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MicrosoftVTableContext::MethodVFTableLocation ML =
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CGM.getMicrosoftVTableContext().getMethodVFTableLocation(MD);
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// The vbases might be ordered differently in the final overrider object
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// and the complete object, so the "this" argument may sometimes point to
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// memory that has no particular type (e.g. past the complete object).
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// In this case, we just use a generic pointer type.
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// FIXME: might want to have a more precise type in the non-virtual
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// multiple inheritance case.
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if (ML.VBase || !ML.VFPtrOffset.isZero())
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return 0;
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}
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return MD->getParent();
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}
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llvm::Value *adjustThisArgumentForVirtualCall(CodeGenFunction &CGF,
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GlobalDecl GD,
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llvm::Value *This);
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void BuildInstanceFunctionParams(CodeGenFunction &CGF,
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QualType &ResTy,
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FunctionArgList &Params);
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llvm::Value *adjustThisParameterInVirtualFunctionPrologue(
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CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This);
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void EmitInstanceFunctionProlog(CodeGenFunction &CGF);
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void EmitConstructorCall(CodeGenFunction &CGF,
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const CXXConstructorDecl *D, CXXCtorType Type,
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bool ForVirtualBase, bool Delegating,
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llvm::Value *This,
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CallExpr::const_arg_iterator ArgBeg,
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CallExpr::const_arg_iterator ArgEnd);
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void emitVTableDefinitions(CodeGenVTables &CGVT, const CXXRecordDecl *RD);
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llvm::Value *getVTableAddressPointInStructor(
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CodeGenFunction &CGF, const CXXRecordDecl *VTableClass,
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BaseSubobject Base, const CXXRecordDecl *NearestVBase,
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bool &NeedsVirtualOffset);
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llvm::Constant *
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getVTableAddressPointForConstExpr(BaseSubobject Base,
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const CXXRecordDecl *VTableClass);
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llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD,
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CharUnits VPtrOffset);
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llvm::Value *getVirtualFunctionPointer(CodeGenFunction &CGF, GlobalDecl GD,
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llvm::Value *This, llvm::Type *Ty);
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void EmitVirtualDestructorCall(CodeGenFunction &CGF,
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const CXXDestructorDecl *Dtor,
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CXXDtorType DtorType, SourceLocation CallLoc,
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llvm::Value *This);
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void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, GlobalDecl GD,
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CallArgList &CallArgs) {
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assert(GD.getDtorType() == Dtor_Deleting &&
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"Only deleting destructor thunks are available in this ABI");
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CallArgs.add(RValue::get(getStructorImplicitParamValue(CGF)),
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CGM.getContext().IntTy);
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}
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void emitVirtualInheritanceTables(const CXXRecordDecl *RD);
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void setThunkLinkage(llvm::Function *Thunk, bool ForVTable) {
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Thunk->setLinkage(llvm::GlobalValue::WeakAnyLinkage);
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}
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llvm::Value *performThisAdjustment(CodeGenFunction &CGF, llvm::Value *This,
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const ThisAdjustment &TA);
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llvm::Value *performReturnAdjustment(CodeGenFunction &CGF, llvm::Value *Ret,
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const ReturnAdjustment &RA);
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void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
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llvm::GlobalVariable *DeclPtr,
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bool PerformInit);
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// ==== Notes on array cookies =========
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//
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// MSVC seems to only use cookies when the class has a destructor; a
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// two-argument usual array deallocation function isn't sufficient.
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//
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// For example, this code prints "100" and "1":
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// struct A {
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// char x;
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// void *operator new[](size_t sz) {
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// printf("%u\n", sz);
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// return malloc(sz);
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// }
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// void operator delete[](void *p, size_t sz) {
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// printf("%u\n", sz);
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// free(p);
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// }
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// };
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// int main() {
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// A *p = new A[100];
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// delete[] p;
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// }
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// Whereas it prints "104" and "104" if you give A a destructor.
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bool requiresArrayCookie(const CXXDeleteExpr *expr, QualType elementType);
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bool requiresArrayCookie(const CXXNewExpr *expr);
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CharUnits getArrayCookieSizeImpl(QualType type);
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llvm::Value *InitializeArrayCookie(CodeGenFunction &CGF,
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llvm::Value *NewPtr,
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llvm::Value *NumElements,
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const CXXNewExpr *expr,
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QualType ElementType);
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llvm::Value *readArrayCookieImpl(CodeGenFunction &CGF,
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llvm::Value *allocPtr,
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CharUnits cookieSize);
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private:
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MicrosoftMangleContext &getMangleContext() {
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return cast<MicrosoftMangleContext>(CodeGen::CGCXXABI::getMangleContext());
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}
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llvm::Constant *getZeroInt() {
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return llvm::ConstantInt::get(CGM.IntTy, 0);
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}
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llvm::Constant *getAllOnesInt() {
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return llvm::Constant::getAllOnesValue(CGM.IntTy);
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}
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llvm::Constant *getConstantOrZeroInt(llvm::Constant *C) {
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return C ? C : getZeroInt();
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}
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llvm::Value *getValueOrZeroInt(llvm::Value *C) {
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return C ? C : getZeroInt();
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}
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void
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GetNullMemberPointerFields(const MemberPointerType *MPT,
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llvm::SmallVectorImpl<llvm::Constant *> &fields);
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/// \brief Finds the offset from the base of RD to the vbptr it uses, even if
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/// it is reusing a vbptr from a non-virtual base. RD must have morally
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/// virtual bases.
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CharUnits GetVBPtrOffsetFromBases(const CXXRecordDecl *RD);
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/// \brief Shared code for virtual base adjustment. Returns the offset from
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/// the vbptr to the virtual base. Optionally returns the address of the
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/// vbptr itself.
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llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
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llvm::Value *Base,
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llvm::Value *VBPtrOffset,
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llvm::Value *VBTableOffset,
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llvm::Value **VBPtr = 0);
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llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
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llvm::Value *Base,
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int32_t VBPtrOffset,
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int32_t VBTableOffset,
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llvm::Value **VBPtr = 0) {
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llvm::Value *VBPOffset = llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset),
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*VBTOffset = llvm::ConstantInt::get(CGM.IntTy, VBTableOffset);
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return GetVBaseOffsetFromVBPtr(CGF, Base, VBPOffset, VBTOffset, VBPtr);
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}
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/// \brief Performs a full virtual base adjustment. Used to dereference
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/// pointers to members of virtual bases.
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llvm::Value *AdjustVirtualBase(CodeGenFunction &CGF, const CXXRecordDecl *RD,
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llvm::Value *Base,
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llvm::Value *VirtualBaseAdjustmentOffset,
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llvm::Value *VBPtrOffset /* optional */);
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/// \brief Emits a full member pointer with the fields common to data and
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/// function member pointers.
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llvm::Constant *EmitFullMemberPointer(llvm::Constant *FirstField,
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bool IsMemberFunction,
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const CXXRecordDecl *RD,
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CharUnits NonVirtualBaseAdjustment);
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llvm::Constant *BuildMemberPointer(const CXXRecordDecl *RD,
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const CXXMethodDecl *MD,
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CharUnits NonVirtualBaseAdjustment);
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bool MemberPointerConstantIsNull(const MemberPointerType *MPT,
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llvm::Constant *MP);
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/// \brief - Initialize all vbptrs of 'this' with RD as the complete type.
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void EmitVBPtrStores(CodeGenFunction &CGF, const CXXRecordDecl *RD);
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/// \brief Caching wrapper around VBTableBuilder::enumerateVBTables().
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const VBTableVector &EnumerateVBTables(const CXXRecordDecl *RD);
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/// \brief Generate a thunk for calling a virtual member function MD.
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llvm::Function *EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
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StringRef ThunkName);
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public:
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virtual llvm::Type *ConvertMemberPointerType(const MemberPointerType *MPT);
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virtual bool isZeroInitializable(const MemberPointerType *MPT);
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virtual llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT);
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virtual llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT,
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CharUnits offset);
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virtual llvm::Constant *EmitMemberPointer(const CXXMethodDecl *MD);
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virtual llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT);
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virtual llvm::Value *EmitMemberPointerComparison(CodeGenFunction &CGF,
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llvm::Value *L,
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llvm::Value *R,
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const MemberPointerType *MPT,
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bool Inequality);
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virtual llvm::Value *EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
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llvm::Value *MemPtr,
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const MemberPointerType *MPT);
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virtual llvm::Value *EmitMemberDataPointerAddress(CodeGenFunction &CGF,
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llvm::Value *Base,
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llvm::Value *MemPtr,
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const MemberPointerType *MPT);
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virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF,
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const CastExpr *E,
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llvm::Value *Src);
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virtual llvm::Constant *EmitMemberPointerConversion(const CastExpr *E,
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llvm::Constant *Src);
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virtual llvm::Value *
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EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
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llvm::Value *&This,
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llvm::Value *MemPtr,
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const MemberPointerType *MPT);
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private:
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typedef std::pair<const CXXRecordDecl *, CharUnits> VFTableIdTy;
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typedef llvm::DenseMap<VFTableIdTy, llvm::GlobalVariable *> VFTablesMapTy;
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/// \brief All the vftables that have been referenced.
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VFTablesMapTy VFTablesMap;
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/// \brief This set holds the record decls we've deferred vtable emission for.
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llvm::SmallPtrSet<const CXXRecordDecl *, 4> DeferredVFTables;
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/// \brief All the vbtables which have been referenced.
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llvm::DenseMap<const CXXRecordDecl *, VBTableVector> VBTablesMap;
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/// Info on the global variable used to guard initialization of static locals.
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/// The BitIndex field is only used for externally invisible declarations.
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struct GuardInfo {
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GuardInfo() : Guard(0), BitIndex(0) {}
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llvm::GlobalVariable *Guard;
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unsigned BitIndex;
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};
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/// Map from DeclContext to the current guard variable. We assume that the
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/// AST is visited in source code order.
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llvm::DenseMap<const DeclContext *, GuardInfo> GuardVariableMap;
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};
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}
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llvm::Value *MicrosoftCXXABI::adjustToCompleteObject(CodeGenFunction &CGF,
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llvm::Value *ptr,
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QualType type) {
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// FIXME: implement
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return ptr;
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}
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/// \brief Finds the first non-virtual base of RD that has virtual bases. If RD
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/// doesn't have a vbptr, it will reuse the vbptr of the returned class.
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static const CXXRecordDecl *FindFirstNVBaseWithVBases(const CXXRecordDecl *RD) {
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for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
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E = RD->bases_end(); I != E; ++I) {
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const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl();
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if (!I->isVirtual() && Base->getNumVBases() > 0)
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return Base;
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}
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llvm_unreachable("RD must have an nv base with vbases");
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}
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CharUnits MicrosoftCXXABI::GetVBPtrOffsetFromBases(const CXXRecordDecl *RD) {
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assert(RD->getNumVBases());
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CharUnits Total = CharUnits::Zero();
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while (RD) {
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const ASTRecordLayout &RDLayout = getContext().getASTRecordLayout(RD);
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CharUnits VBPtrOffset = RDLayout.getVBPtrOffset();
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// -1 is the sentinel for no vbptr.
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if (VBPtrOffset != CharUnits::fromQuantity(-1)) {
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Total += VBPtrOffset;
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break;
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}
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RD = FindFirstNVBaseWithVBases(RD);
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Total += RDLayout.getBaseClassOffset(RD);
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}
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return Total;
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}
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llvm::Value *
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MicrosoftCXXABI::GetVirtualBaseClassOffset(CodeGenFunction &CGF,
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llvm::Value *This,
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const CXXRecordDecl *ClassDecl,
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const CXXRecordDecl *BaseClassDecl) {
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int64_t VBPtrChars = GetVBPtrOffsetFromBases(ClassDecl).getQuantity();
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llvm::Value *VBPtrOffset = llvm::ConstantInt::get(CGM.PtrDiffTy, VBPtrChars);
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CharUnits IntSize = getContext().getTypeSizeInChars(getContext().IntTy);
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CharUnits VBTableChars =
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IntSize *
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CGM.getMicrosoftVTableContext().getVBTableIndex(ClassDecl, BaseClassDecl);
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llvm::Value *VBTableOffset =
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llvm::ConstantInt::get(CGM.IntTy, VBTableChars.getQuantity());
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llvm::Value *VBPtrToNewBase =
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GetVBaseOffsetFromVBPtr(CGF, This, VBPtrOffset, VBTableOffset);
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VBPtrToNewBase =
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CGF.Builder.CreateSExtOrBitCast(VBPtrToNewBase, CGM.PtrDiffTy);
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return CGF.Builder.CreateNSWAdd(VBPtrOffset, VBPtrToNewBase);
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}
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bool MicrosoftCXXABI::HasThisReturn(GlobalDecl GD) const {
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return isa<CXXConstructorDecl>(GD.getDecl());
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}
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void MicrosoftCXXABI::BuildConstructorSignature(const CXXConstructorDecl *Ctor,
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CXXCtorType Type,
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CanQualType &ResTy,
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SmallVectorImpl<CanQualType> &ArgTys) {
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// 'this' parameter and 'this' return are already in place
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const CXXRecordDecl *Class = Ctor->getParent();
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if (Class->getNumVBases()) {
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// Constructors of classes with virtual bases take an implicit parameter.
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ArgTys.push_back(CGM.getContext().IntTy);
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}
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}
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llvm::BasicBlock *
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MicrosoftCXXABI::EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
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const CXXRecordDecl *RD) {
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llvm::Value *IsMostDerivedClass = getStructorImplicitParamValue(CGF);
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assert(IsMostDerivedClass &&
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"ctor for a class with virtual bases must have an implicit parameter");
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llvm::Value *IsCompleteObject =
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CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
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llvm::BasicBlock *CallVbaseCtorsBB = CGF.createBasicBlock("ctor.init_vbases");
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llvm::BasicBlock *SkipVbaseCtorsBB = CGF.createBasicBlock("ctor.skip_vbases");
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CGF.Builder.CreateCondBr(IsCompleteObject,
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CallVbaseCtorsBB, SkipVbaseCtorsBB);
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CGF.EmitBlock(CallVbaseCtorsBB);
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// Fill in the vbtable pointers here.
|
|
EmitVBPtrStores(CGF, RD);
|
|
|
|
// CGF will put the base ctor calls in this basic block for us later.
|
|
|
|
return SkipVbaseCtorsBB;
|
|
}
|
|
|
|
void MicrosoftCXXABI::initializeHiddenVirtualInheritanceMembers(
|
|
CodeGenFunction &CGF, const CXXRecordDecl *RD) {
|
|
// In most cases, an override for a vbase virtual method can adjust
|
|
// the "this" parameter by applying a constant offset.
|
|
// However, this is not enough while a constructor or a destructor of some
|
|
// class X is being executed if all the following conditions are met:
|
|
// - X has virtual bases, (1)
|
|
// - X overrides a virtual method M of a vbase Y, (2)
|
|
// - X itself is a vbase of the most derived class.
|
|
//
|
|
// If (1) and (2) are true, the vtorDisp for vbase Y is a hidden member of X
|
|
// which holds the extra amount of "this" adjustment we must do when we use
|
|
// the X vftables (i.e. during X ctor or dtor).
|
|
// Outside the ctors and dtors, the values of vtorDisps are zero.
|
|
|
|
const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
|
|
typedef ASTRecordLayout::VBaseOffsetsMapTy VBOffsets;
|
|
const VBOffsets &VBaseMap = Layout.getVBaseOffsetsMap();
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
|
|
unsigned AS =
|
|
cast<llvm::PointerType>(getThisValue(CGF)->getType())->getAddressSpace();
|
|
llvm::Value *Int8This = 0; // Initialize lazily.
|
|
|
|
for (VBOffsets::const_iterator I = VBaseMap.begin(), E = VBaseMap.end();
|
|
I != E; ++I) {
|
|
if (!I->second.hasVtorDisp())
|
|
continue;
|
|
|
|
llvm::Value *VBaseOffset =
|
|
GetVirtualBaseClassOffset(CGF, getThisValue(CGF), RD, I->first);
|
|
// FIXME: it doesn't look right that we SExt in GetVirtualBaseClassOffset()
|
|
// just to Trunc back immediately.
|
|
VBaseOffset = Builder.CreateTruncOrBitCast(VBaseOffset, CGF.Int32Ty);
|
|
uint64_t ConstantVBaseOffset =
|
|
Layout.getVBaseClassOffset(I->first).getQuantity();
|
|
|
|
// vtorDisp_for_vbase = vbptr[vbase_idx] - offsetof(RD, vbase).
|
|
llvm::Value *VtorDispValue = Builder.CreateSub(
|
|
VBaseOffset, llvm::ConstantInt::get(CGM.Int32Ty, ConstantVBaseOffset),
|
|
"vtordisp.value");
|
|
|
|
if (!Int8This)
|
|
Int8This = Builder.CreateBitCast(getThisValue(CGF),
|
|
CGF.Int8Ty->getPointerTo(AS));
|
|
llvm::Value *VtorDispPtr = Builder.CreateInBoundsGEP(Int8This, VBaseOffset);
|
|
// vtorDisp is always the 32-bits before the vbase in the class layout.
|
|
VtorDispPtr = Builder.CreateConstGEP1_32(VtorDispPtr, -4);
|
|
VtorDispPtr = Builder.CreateBitCast(
|
|
VtorDispPtr, CGF.Int32Ty->getPointerTo(AS), "vtordisp.ptr");
|
|
|
|
Builder.CreateStore(VtorDispValue, VtorDispPtr);
|
|
}
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitCXXConstructors(const CXXConstructorDecl *D) {
|
|
// There's only one constructor type in this ABI.
|
|
CGM.EmitGlobal(GlobalDecl(D, Ctor_Complete));
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitVBPtrStores(CodeGenFunction &CGF,
|
|
const CXXRecordDecl *RD) {
|
|
llvm::Value *ThisInt8Ptr =
|
|
CGF.Builder.CreateBitCast(getThisValue(CGF), CGM.Int8PtrTy, "this.int8");
|
|
|
|
const VBTableVector &VBTables = EnumerateVBTables(RD);
|
|
for (VBTableVector::const_iterator I = VBTables.begin(), E = VBTables.end();
|
|
I != E; ++I) {
|
|
const ASTRecordLayout &SubobjectLayout =
|
|
CGM.getContext().getASTRecordLayout(I->VBPtrSubobject.getBase());
|
|
uint64_t Offs = (I->VBPtrSubobject.getBaseOffset() +
|
|
SubobjectLayout.getVBPtrOffset()).getQuantity();
|
|
llvm::Value *VBPtr =
|
|
CGF.Builder.CreateConstInBoundsGEP1_64(ThisInt8Ptr, Offs);
|
|
VBPtr = CGF.Builder.CreateBitCast(VBPtr, I->GV->getType()->getPointerTo(0),
|
|
"vbptr." + I->ReusingBase->getName());
|
|
CGF.Builder.CreateStore(I->GV, VBPtr);
|
|
}
|
|
}
|
|
|
|
void MicrosoftCXXABI::BuildDestructorSignature(const CXXDestructorDecl *Dtor,
|
|
CXXDtorType Type,
|
|
CanQualType &ResTy,
|
|
SmallVectorImpl<CanQualType> &ArgTys) {
|
|
// 'this' is already in place
|
|
|
|
// TODO: 'for base' flag
|
|
|
|
if (Type == Dtor_Deleting) {
|
|
// The scalar deleting destructor takes an implicit int parameter.
|
|
ArgTys.push_back(CGM.getContext().IntTy);
|
|
}
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitCXXDestructors(const CXXDestructorDecl *D) {
|
|
// The TU defining a dtor is only guaranteed to emit a base destructor. All
|
|
// other destructor variants are delegating thunks.
|
|
CGM.EmitGlobal(GlobalDecl(D, Dtor_Base));
|
|
}
|
|
|
|
llvm::Value *MicrosoftCXXABI::adjustThisArgumentForVirtualCall(
|
|
CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) {
|
|
GD = GD.getCanonicalDecl();
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
|
|
// FIXME: consider splitting the vdtor vs regular method code into two
|
|
// functions.
|
|
|
|
GlobalDecl LookupGD = GD;
|
|
if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
|
|
// Complete dtors take a pointer to the complete object,
|
|
// thus don't need adjustment.
|
|
if (GD.getDtorType() == Dtor_Complete)
|
|
return This;
|
|
|
|
// There's only Dtor_Deleting in vftable but it shares the this adjustment
|
|
// with the base one, so look up the deleting one instead.
|
|
LookupGD = GlobalDecl(DD, Dtor_Deleting);
|
|
}
|
|
MicrosoftVTableContext::MethodVFTableLocation ML =
|
|
CGM.getMicrosoftVTableContext().getMethodVFTableLocation(LookupGD);
|
|
|
|
unsigned AS = cast<llvm::PointerType>(This->getType())->getAddressSpace();
|
|
llvm::Type *charPtrTy = CGF.Int8Ty->getPointerTo(AS);
|
|
CharUnits StaticOffset = ML.VFPtrOffset;
|
|
if (ML.VBase) {
|
|
bool AvoidVirtualOffset = false;
|
|
if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base) {
|
|
// A base destructor can only be called from a complete destructor of the
|
|
// same record type or another destructor of a more derived type;
|
|
// or a constructor of the same record type if an exception is thrown.
|
|
assert(isa<CXXDestructorDecl>(CGF.CurGD.getDecl()) ||
|
|
isa<CXXConstructorDecl>(CGF.CurGD.getDecl()));
|
|
const CXXRecordDecl *CurRD =
|
|
cast<CXXMethodDecl>(CGF.CurGD.getDecl())->getParent();
|
|
|
|
if (MD->getParent() == CurRD) {
|
|
if (isa<CXXDestructorDecl>(CGF.CurGD.getDecl()))
|
|
assert(CGF.CurGD.getDtorType() == Dtor_Complete);
|
|
if (isa<CXXConstructorDecl>(CGF.CurGD.getDecl()))
|
|
assert(CGF.CurGD.getCtorType() == Ctor_Complete);
|
|
// We're calling the main base dtor from a complete structor,
|
|
// so we know the "this" offset statically.
|
|
AvoidVirtualOffset = true;
|
|
} else {
|
|
// Let's see if we try to call a destructor of a non-virtual base.
|
|
for (CXXRecordDecl::base_class_const_iterator I = CurRD->bases_begin(),
|
|
E = CurRD->bases_end(); I != E; ++I) {
|
|
if (I->getType()->getAsCXXRecordDecl() != MD->getParent())
|
|
continue;
|
|
// If we call a base destructor for a non-virtual base, we statically
|
|
// know where it expects the vfptr and "this" to be.
|
|
// The total offset should reflect the adjustment done by
|
|
// adjustThisParameterInVirtualFunctionPrologue().
|
|
AvoidVirtualOffset = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (AvoidVirtualOffset) {
|
|
const ASTRecordLayout &Layout =
|
|
CGF.getContext().getASTRecordLayout(MD->getParent());
|
|
StaticOffset += Layout.getVBaseClassOffset(ML.VBase);
|
|
} else {
|
|
This = CGF.Builder.CreateBitCast(This, charPtrTy);
|
|
llvm::Value *VBaseOffset =
|
|
GetVirtualBaseClassOffset(CGF, This, MD->getParent(), ML.VBase);
|
|
This = CGF.Builder.CreateInBoundsGEP(This, VBaseOffset);
|
|
}
|
|
}
|
|
if (!StaticOffset.isZero()) {
|
|
assert(StaticOffset.isPositive());
|
|
This = CGF.Builder.CreateBitCast(This, charPtrTy);
|
|
if (ML.VBase) {
|
|
// Non-virtual adjustment might result in a pointer outside the allocated
|
|
// object, e.g. if the final overrider class is laid out after the virtual
|
|
// base that declares a method in the most derived class.
|
|
// FIXME: Update the code that emits this adjustment in thunks prologues.
|
|
This = CGF.Builder.CreateConstGEP1_32(This, StaticOffset.getQuantity());
|
|
} else {
|
|
This = CGF.Builder.CreateConstInBoundsGEP1_32(This,
|
|
StaticOffset.getQuantity());
|
|
}
|
|
}
|
|
return This;
|
|
}
|
|
|
|
static bool IsDeletingDtor(GlobalDecl GD) {
|
|
const CXXMethodDecl* MD = cast<CXXMethodDecl>(GD.getDecl());
|
|
if (isa<CXXDestructorDecl>(MD)) {
|
|
return GD.getDtorType() == Dtor_Deleting;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void MicrosoftCXXABI::BuildInstanceFunctionParams(CodeGenFunction &CGF,
|
|
QualType &ResTy,
|
|
FunctionArgList &Params) {
|
|
BuildThisParam(CGF, Params);
|
|
|
|
ASTContext &Context = getContext();
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
|
|
if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
|
|
ImplicitParamDecl *IsMostDerived
|
|
= ImplicitParamDecl::Create(Context, 0,
|
|
CGF.CurGD.getDecl()->getLocation(),
|
|
&Context.Idents.get("is_most_derived"),
|
|
Context.IntTy);
|
|
Params.push_back(IsMostDerived);
|
|
getStructorImplicitParamDecl(CGF) = IsMostDerived;
|
|
} else if (IsDeletingDtor(CGF.CurGD)) {
|
|
ImplicitParamDecl *ShouldDelete
|
|
= ImplicitParamDecl::Create(Context, 0,
|
|
CGF.CurGD.getDecl()->getLocation(),
|
|
&Context.Idents.get("should_call_delete"),
|
|
Context.IntTy);
|
|
Params.push_back(ShouldDelete);
|
|
getStructorImplicitParamDecl(CGF) = ShouldDelete;
|
|
}
|
|
}
|
|
|
|
llvm::Value *MicrosoftCXXABI::adjustThisParameterInVirtualFunctionPrologue(
|
|
CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) {
|
|
GD = GD.getCanonicalDecl();
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
|
|
|
|
GlobalDecl LookupGD = GD;
|
|
if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
|
|
// Complete destructors take a pointer to the complete object as a
|
|
// parameter, thus don't need this adjustment.
|
|
if (GD.getDtorType() == Dtor_Complete)
|
|
return This;
|
|
|
|
// There's no Dtor_Base in vftable but it shares the this adjustment with
|
|
// the deleting one, so look it up instead.
|
|
LookupGD = GlobalDecl(DD, Dtor_Deleting);
|
|
}
|
|
|
|
// In this ABI, every virtual function takes a pointer to one of the
|
|
// subobjects that first defines it as the 'this' parameter, rather than a
|
|
// pointer to ther final overrider subobject. Thus, we need to adjust it back
|
|
// to the final overrider subobject before use.
|
|
// See comments in the MicrosoftVFTableContext implementation for the details.
|
|
|
|
MicrosoftVTableContext::MethodVFTableLocation ML =
|
|
CGM.getMicrosoftVTableContext().getMethodVFTableLocation(LookupGD);
|
|
CharUnits Adjustment = ML.VFPtrOffset;
|
|
if (ML.VBase) {
|
|
const ASTRecordLayout &DerivedLayout =
|
|
CGF.getContext().getASTRecordLayout(MD->getParent());
|
|
Adjustment += DerivedLayout.getVBaseClassOffset(ML.VBase);
|
|
}
|
|
|
|
if (Adjustment.isZero())
|
|
return This;
|
|
|
|
unsigned AS = cast<llvm::PointerType>(This->getType())->getAddressSpace();
|
|
llvm::Type *charPtrTy = CGF.Int8Ty->getPointerTo(AS),
|
|
*thisTy = This->getType();
|
|
|
|
This = CGF.Builder.CreateBitCast(This, charPtrTy);
|
|
assert(Adjustment.isPositive());
|
|
This =
|
|
CGF.Builder.CreateConstInBoundsGEP1_32(This, -Adjustment.getQuantity());
|
|
return CGF.Builder.CreateBitCast(This, thisTy);
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
|
|
EmitThisParam(CGF);
|
|
|
|
/// If this is a function that the ABI specifies returns 'this', initialize
|
|
/// the return slot to 'this' at the start of the function.
|
|
///
|
|
/// Unlike the setting of return types, this is done within the ABI
|
|
/// implementation instead of by clients of CGCXXABI because:
|
|
/// 1) getThisValue is currently protected
|
|
/// 2) in theory, an ABI could implement 'this' returns some other way;
|
|
/// HasThisReturn only specifies a contract, not the implementation
|
|
if (HasThisReturn(CGF.CurGD))
|
|
CGF.Builder.CreateStore(getThisValue(CGF), CGF.ReturnValue);
|
|
|
|
const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
|
|
if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
|
|
assert(getStructorImplicitParamDecl(CGF) &&
|
|
"no implicit parameter for a constructor with virtual bases?");
|
|
getStructorImplicitParamValue(CGF)
|
|
= CGF.Builder.CreateLoad(
|
|
CGF.GetAddrOfLocalVar(getStructorImplicitParamDecl(CGF)),
|
|
"is_most_derived");
|
|
}
|
|
|
|
if (IsDeletingDtor(CGF.CurGD)) {
|
|
assert(getStructorImplicitParamDecl(CGF) &&
|
|
"no implicit parameter for a deleting destructor?");
|
|
getStructorImplicitParamValue(CGF)
|
|
= CGF.Builder.CreateLoad(
|
|
CGF.GetAddrOfLocalVar(getStructorImplicitParamDecl(CGF)),
|
|
"should_call_delete");
|
|
}
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitConstructorCall(CodeGenFunction &CGF,
|
|
const CXXConstructorDecl *D,
|
|
CXXCtorType Type,
|
|
bool ForVirtualBase,
|
|
bool Delegating,
|
|
llvm::Value *This,
|
|
CallExpr::const_arg_iterator ArgBeg,
|
|
CallExpr::const_arg_iterator ArgEnd) {
|
|
assert(Type == Ctor_Complete || Type == Ctor_Base);
|
|
llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(D, Ctor_Complete);
|
|
|
|
llvm::Value *ImplicitParam = 0;
|
|
QualType ImplicitParamTy;
|
|
if (D->getParent()->getNumVBases()) {
|
|
ImplicitParam = llvm::ConstantInt::get(CGM.Int32Ty, Type == Ctor_Complete);
|
|
ImplicitParamTy = getContext().IntTy;
|
|
}
|
|
|
|
// FIXME: Provide a source location here.
|
|
CGF.EmitCXXMemberCall(D, SourceLocation(), Callee, ReturnValueSlot(), This,
|
|
ImplicitParam, ImplicitParamTy, ArgBeg, ArgEnd);
|
|
}
|
|
|
|
void MicrosoftCXXABI::emitVTableDefinitions(CodeGenVTables &CGVT,
|
|
const CXXRecordDecl *RD) {
|
|
MicrosoftVTableContext &VFTContext = CGM.getMicrosoftVTableContext();
|
|
MicrosoftVTableContext::VFPtrListTy VFPtrs = VFTContext.getVFPtrOffsets(RD);
|
|
llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
|
|
|
|
for (MicrosoftVTableContext::VFPtrListTy::iterator I = VFPtrs.begin(),
|
|
E = VFPtrs.end(); I != E; ++I) {
|
|
llvm::GlobalVariable *VTable = getAddrOfVTable(RD, I->VFPtrFullOffset);
|
|
if (VTable->hasInitializer())
|
|
continue;
|
|
|
|
const VTableLayout &VTLayout =
|
|
VFTContext.getVFTableLayout(RD, I->VFPtrFullOffset);
|
|
llvm::Constant *Init = CGVT.CreateVTableInitializer(
|
|
RD, VTLayout.vtable_component_begin(),
|
|
VTLayout.getNumVTableComponents(), VTLayout.vtable_thunk_begin(),
|
|
VTLayout.getNumVTableThunks());
|
|
VTable->setInitializer(Init);
|
|
|
|
VTable->setLinkage(Linkage);
|
|
CGM.setTypeVisibility(VTable, RD, CodeGenModule::TVK_ForVTable);
|
|
}
|
|
}
|
|
|
|
llvm::Value *MicrosoftCXXABI::getVTableAddressPointInStructor(
|
|
CodeGenFunction &CGF, const CXXRecordDecl *VTableClass, BaseSubobject Base,
|
|
const CXXRecordDecl *NearestVBase, bool &NeedsVirtualOffset) {
|
|
NeedsVirtualOffset = (NearestVBase != 0);
|
|
|
|
llvm::Value *VTableAddressPoint =
|
|
getAddrOfVTable(VTableClass, Base.getBaseOffset());
|
|
if (!VTableAddressPoint) {
|
|
assert(Base.getBase()->getNumVBases() &&
|
|
!CGM.getContext().getASTRecordLayout(Base.getBase()).hasOwnVFPtr());
|
|
}
|
|
return VTableAddressPoint;
|
|
}
|
|
|
|
static void mangleVFTableName(MicrosoftMangleContext &MangleContext,
|
|
const CXXRecordDecl *RD, const VFPtrInfo &VFPtr,
|
|
SmallString<256> &Name) {
|
|
llvm::raw_svector_ostream Out(Name);
|
|
MangleContext.mangleCXXVFTable(RD, VFPtr.PathToMangle, Out);
|
|
}
|
|
|
|
llvm::Constant *MicrosoftCXXABI::getVTableAddressPointForConstExpr(
|
|
BaseSubobject Base, const CXXRecordDecl *VTableClass) {
|
|
llvm::Constant *VTable = getAddrOfVTable(VTableClass, Base.getBaseOffset());
|
|
assert(VTable && "Couldn't find a vftable for the given base?");
|
|
return VTable;
|
|
}
|
|
|
|
llvm::GlobalVariable *MicrosoftCXXABI::getAddrOfVTable(const CXXRecordDecl *RD,
|
|
CharUnits VPtrOffset) {
|
|
// getAddrOfVTable may return 0 if asked to get an address of a vtable which
|
|
// shouldn't be used in the given record type. We want to cache this result in
|
|
// VFTablesMap, thus a simple zero check is not sufficient.
|
|
VFTableIdTy ID(RD, VPtrOffset);
|
|
VFTablesMapTy::iterator I;
|
|
bool Inserted;
|
|
llvm::tie(I, Inserted) = VFTablesMap.insert(
|
|
std::make_pair(ID, static_cast<llvm::GlobalVariable *>(0)));
|
|
if (!Inserted)
|
|
return I->second;
|
|
|
|
llvm::GlobalVariable *&VTable = I->second;
|
|
|
|
MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
|
|
const MicrosoftVTableContext::VFPtrListTy &VFPtrs =
|
|
VTContext.getVFPtrOffsets(RD);
|
|
|
|
if (DeferredVFTables.insert(RD)) {
|
|
// We haven't processed this record type before.
|
|
// Queue up this v-table for possible deferred emission.
|
|
CGM.addDeferredVTable(RD);
|
|
|
|
#ifndef NDEBUG
|
|
// Create all the vftables at once in order to make sure each vftable has
|
|
// a unique mangled name.
|
|
llvm::StringSet<> ObservedMangledNames;
|
|
for (size_t J = 0, F = VFPtrs.size(); J != F; ++J) {
|
|
SmallString<256> Name;
|
|
mangleVFTableName(getMangleContext(), RD, VFPtrs[J], Name);
|
|
if (!ObservedMangledNames.insert(Name.str()))
|
|
llvm_unreachable("Already saw this mangling before?");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
for (size_t J = 0, F = VFPtrs.size(); J != F; ++J) {
|
|
if (VFPtrs[J].VFPtrFullOffset != VPtrOffset)
|
|
continue;
|
|
|
|
llvm::ArrayType *ArrayType = llvm::ArrayType::get(
|
|
CGM.Int8PtrTy,
|
|
VTContext.getVFTableLayout(RD, VFPtrs[J].VFPtrFullOffset)
|
|
.getNumVTableComponents());
|
|
|
|
SmallString<256> Name;
|
|
mangleVFTableName(getMangleContext(), RD, VFPtrs[J], Name);
|
|
VTable = CGM.CreateOrReplaceCXXRuntimeVariable(
|
|
Name.str(), ArrayType, llvm::GlobalValue::ExternalLinkage);
|
|
VTable->setUnnamedAddr(true);
|
|
break;
|
|
}
|
|
|
|
return VTable;
|
|
}
|
|
|
|
llvm::Value *MicrosoftCXXABI::getVirtualFunctionPointer(CodeGenFunction &CGF,
|
|
GlobalDecl GD,
|
|
llvm::Value *This,
|
|
llvm::Type *Ty) {
|
|
GD = GD.getCanonicalDecl();
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
|
|
Ty = Ty->getPointerTo()->getPointerTo();
|
|
llvm::Value *VPtr = adjustThisArgumentForVirtualCall(CGF, GD, This);
|
|
llvm::Value *VTable = CGF.GetVTablePtr(VPtr, Ty);
|
|
|
|
MicrosoftVTableContext::MethodVFTableLocation ML =
|
|
CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
|
|
llvm::Value *VFuncPtr =
|
|
Builder.CreateConstInBoundsGEP1_64(VTable, ML.Index, "vfn");
|
|
return Builder.CreateLoad(VFuncPtr);
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitVirtualDestructorCall(CodeGenFunction &CGF,
|
|
const CXXDestructorDecl *Dtor,
|
|
CXXDtorType DtorType,
|
|
SourceLocation CallLoc,
|
|
llvm::Value *This) {
|
|
assert(DtorType == Dtor_Deleting || DtorType == Dtor_Complete);
|
|
|
|
// We have only one destructor in the vftable but can get both behaviors
|
|
// by passing an implicit int parameter.
|
|
GlobalDecl GD(Dtor, Dtor_Deleting);
|
|
const CGFunctionInfo *FInfo =
|
|
&CGM.getTypes().arrangeCXXDestructor(Dtor, Dtor_Deleting);
|
|
llvm::Type *Ty = CGF.CGM.getTypes().GetFunctionType(*FInfo);
|
|
llvm::Value *Callee = getVirtualFunctionPointer(CGF, GD, This, Ty);
|
|
|
|
ASTContext &Context = CGF.getContext();
|
|
llvm::Value *ImplicitParam =
|
|
llvm::ConstantInt::get(llvm::IntegerType::getInt32Ty(CGF.getLLVMContext()),
|
|
DtorType == Dtor_Deleting);
|
|
|
|
This = adjustThisArgumentForVirtualCall(CGF, GD, This);
|
|
CGF.EmitCXXMemberCall(Dtor, CallLoc, Callee, ReturnValueSlot(), This,
|
|
ImplicitParam, Context.IntTy, 0, 0);
|
|
}
|
|
|
|
const VBTableVector &
|
|
MicrosoftCXXABI::EnumerateVBTables(const CXXRecordDecl *RD) {
|
|
// At this layer, we can key the cache off of a single class, which is much
|
|
// easier than caching at the GlobalVariable layer.
|
|
llvm::DenseMap<const CXXRecordDecl*, VBTableVector>::iterator I;
|
|
bool added;
|
|
llvm::tie(I, added) = VBTablesMap.insert(std::make_pair(RD, VBTableVector()));
|
|
VBTableVector &VBTables = I->second;
|
|
if (!added)
|
|
return VBTables;
|
|
|
|
VBTableBuilder(CGM, RD).enumerateVBTables(VBTables);
|
|
|
|
return VBTables;
|
|
}
|
|
|
|
llvm::Function *
|
|
MicrosoftCXXABI::EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
|
|
StringRef ThunkName) {
|
|
// If the thunk has been generated previously, just return it.
|
|
if (llvm::GlobalValue *GV = CGM.getModule().getNamedValue(ThunkName))
|
|
return cast<llvm::Function>(GV);
|
|
|
|
// Create the llvm::Function.
|
|
const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeGlobalDeclaration(MD);
|
|
llvm::FunctionType *ThunkTy = CGM.getTypes().GetFunctionType(FnInfo);
|
|
llvm::Function *ThunkFn =
|
|
llvm::Function::Create(ThunkTy, llvm::Function::ExternalLinkage,
|
|
ThunkName.str(), &CGM.getModule());
|
|
assert(ThunkFn->getName() == ThunkName && "name was uniqued!");
|
|
|
|
ThunkFn->setLinkage(MD->isExternallyVisible()
|
|
? llvm::GlobalValue::LinkOnceODRLinkage
|
|
: llvm::GlobalValue::InternalLinkage);
|
|
|
|
CGM.SetLLVMFunctionAttributes(MD, FnInfo, ThunkFn);
|
|
CGM.SetLLVMFunctionAttributesForDefinition(MD, ThunkFn);
|
|
|
|
// Start codegen.
|
|
CodeGenFunction CGF(CGM);
|
|
CGF.StartThunk(ThunkFn, MD, FnInfo);
|
|
|
|
// Get to the Callee.
|
|
llvm::Value *This = CGF.LoadCXXThis();
|
|
llvm::Value *Callee = getVirtualFunctionPointer(CGF, MD, This, ThunkTy);
|
|
|
|
// Make the call and return the result.
|
|
CGF.EmitCallAndReturnForThunk(MD, Callee, 0);
|
|
|
|
return ThunkFn;
|
|
}
|
|
|
|
void MicrosoftCXXABI::emitVirtualInheritanceTables(const CXXRecordDecl *RD) {
|
|
const VBTableVector &VBTables = EnumerateVBTables(RD);
|
|
llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
|
|
|
|
for (VBTableVector::const_iterator I = VBTables.begin(), E = VBTables.end();
|
|
I != E; ++I) {
|
|
I->EmitVBTableDefinition(CGM, RD, Linkage);
|
|
}
|
|
}
|
|
|
|
llvm::Value *MicrosoftCXXABI::performThisAdjustment(CodeGenFunction &CGF,
|
|
llvm::Value *This,
|
|
const ThisAdjustment &TA) {
|
|
if (TA.isEmpty())
|
|
return This;
|
|
|
|
llvm::Value *V = CGF.Builder.CreateBitCast(This, CGF.Int8PtrTy);
|
|
|
|
if (!TA.Virtual.isEmpty()) {
|
|
assert(TA.Virtual.Microsoft.VtordispOffset < 0);
|
|
// Adjust the this argument based on the vtordisp value.
|
|
llvm::Value *VtorDispPtr =
|
|
CGF.Builder.CreateConstGEP1_32(V, TA.Virtual.Microsoft.VtordispOffset);
|
|
VtorDispPtr =
|
|
CGF.Builder.CreateBitCast(VtorDispPtr, CGF.Int32Ty->getPointerTo());
|
|
llvm::Value *VtorDisp = CGF.Builder.CreateLoad(VtorDispPtr, "vtordisp");
|
|
V = CGF.Builder.CreateGEP(V, CGF.Builder.CreateNeg(VtorDisp));
|
|
|
|
if (TA.Virtual.Microsoft.VBPtrOffset) {
|
|
// If the final overrider is defined in a virtual base other than the one
|
|
// that holds the vfptr, we have to use a vtordispex thunk which looks up
|
|
// the vbtable of the derived class.
|
|
assert(TA.Virtual.Microsoft.VBPtrOffset > 0);
|
|
assert(TA.Virtual.Microsoft.VBOffsetOffset >= 0);
|
|
llvm::Value *VBPtr;
|
|
llvm::Value *VBaseOffset =
|
|
GetVBaseOffsetFromVBPtr(CGF, V, -TA.Virtual.Microsoft.VBPtrOffset,
|
|
TA.Virtual.Microsoft.VBOffsetOffset, &VBPtr);
|
|
V = CGF.Builder.CreateInBoundsGEP(VBPtr, VBaseOffset);
|
|
}
|
|
}
|
|
|
|
if (TA.NonVirtual) {
|
|
// Non-virtual adjustment might result in a pointer outside the allocated
|
|
// object, e.g. if the final overrider class is laid out after the virtual
|
|
// base that declares a method in the most derived class.
|
|
V = CGF.Builder.CreateConstGEP1_32(V, TA.NonVirtual);
|
|
}
|
|
|
|
// Don't need to bitcast back, the call CodeGen will handle this.
|
|
return V;
|
|
}
|
|
|
|
llvm::Value *
|
|
MicrosoftCXXABI::performReturnAdjustment(CodeGenFunction &CGF, llvm::Value *Ret,
|
|
const ReturnAdjustment &RA) {
|
|
if (RA.isEmpty())
|
|
return Ret;
|
|
|
|
llvm::Value *V = CGF.Builder.CreateBitCast(Ret, CGF.Int8PtrTy);
|
|
|
|
if (RA.Virtual.Microsoft.VBIndex) {
|
|
assert(RA.Virtual.Microsoft.VBIndex > 0);
|
|
int32_t IntSize =
|
|
getContext().getTypeSizeInChars(getContext().IntTy).getQuantity();
|
|
llvm::Value *VBPtr;
|
|
llvm::Value *VBaseOffset =
|
|
GetVBaseOffsetFromVBPtr(CGF, V, RA.Virtual.Microsoft.VBPtrOffset,
|
|
IntSize * RA.Virtual.Microsoft.VBIndex, &VBPtr);
|
|
V = CGF.Builder.CreateInBoundsGEP(VBPtr, VBaseOffset);
|
|
}
|
|
|
|
if (RA.NonVirtual)
|
|
V = CGF.Builder.CreateConstInBoundsGEP1_32(V, RA.NonVirtual);
|
|
|
|
// Cast back to the original type.
|
|
return CGF.Builder.CreateBitCast(V, Ret->getType());
|
|
}
|
|
|
|
bool MicrosoftCXXABI::requiresArrayCookie(const CXXDeleteExpr *expr,
|
|
QualType elementType) {
|
|
// Microsoft seems to completely ignore the possibility of a
|
|
// two-argument usual deallocation function.
|
|
return elementType.isDestructedType();
|
|
}
|
|
|
|
bool MicrosoftCXXABI::requiresArrayCookie(const CXXNewExpr *expr) {
|
|
// Microsoft seems to completely ignore the possibility of a
|
|
// two-argument usual deallocation function.
|
|
return expr->getAllocatedType().isDestructedType();
|
|
}
|
|
|
|
CharUnits MicrosoftCXXABI::getArrayCookieSizeImpl(QualType type) {
|
|
// The array cookie is always a size_t; we then pad that out to the
|
|
// alignment of the element type.
|
|
ASTContext &Ctx = getContext();
|
|
return std::max(Ctx.getTypeSizeInChars(Ctx.getSizeType()),
|
|
Ctx.getTypeAlignInChars(type));
|
|
}
|
|
|
|
llvm::Value *MicrosoftCXXABI::readArrayCookieImpl(CodeGenFunction &CGF,
|
|
llvm::Value *allocPtr,
|
|
CharUnits cookieSize) {
|
|
unsigned AS = allocPtr->getType()->getPointerAddressSpace();
|
|
llvm::Value *numElementsPtr =
|
|
CGF.Builder.CreateBitCast(allocPtr, CGF.SizeTy->getPointerTo(AS));
|
|
return CGF.Builder.CreateLoad(numElementsPtr);
|
|
}
|
|
|
|
llvm::Value* MicrosoftCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
|
|
llvm::Value *newPtr,
|
|
llvm::Value *numElements,
|
|
const CXXNewExpr *expr,
|
|
QualType elementType) {
|
|
assert(requiresArrayCookie(expr));
|
|
|
|
// The size of the cookie.
|
|
CharUnits cookieSize = getArrayCookieSizeImpl(elementType);
|
|
|
|
// Compute an offset to the cookie.
|
|
llvm::Value *cookiePtr = newPtr;
|
|
|
|
// Write the number of elements into the appropriate slot.
|
|
unsigned AS = newPtr->getType()->getPointerAddressSpace();
|
|
llvm::Value *numElementsPtr
|
|
= CGF.Builder.CreateBitCast(cookiePtr, CGF.SizeTy->getPointerTo(AS));
|
|
CGF.Builder.CreateStore(numElements, numElementsPtr);
|
|
|
|
// Finally, compute a pointer to the actual data buffer by skipping
|
|
// over the cookie completely.
|
|
return CGF.Builder.CreateConstInBoundsGEP1_64(newPtr,
|
|
cookieSize.getQuantity());
|
|
}
|
|
|
|
void MicrosoftCXXABI::EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
|
|
llvm::GlobalVariable *GV,
|
|
bool PerformInit) {
|
|
// MSVC always uses an i32 bitfield to guard initialization, which is *not*
|
|
// threadsafe. Since the user may be linking in inline functions compiled by
|
|
// cl.exe, there's no reason to provide a false sense of security by using
|
|
// critical sections here.
|
|
|
|
if (D.getTLSKind())
|
|
CGM.ErrorUnsupported(&D, "dynamic TLS initialization");
|
|
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::IntegerType *GuardTy = CGF.Int32Ty;
|
|
llvm::ConstantInt *Zero = llvm::ConstantInt::get(GuardTy, 0);
|
|
|
|
// Get the guard variable for this function if we have one already.
|
|
GuardInfo &GI = GuardVariableMap[D.getDeclContext()];
|
|
|
|
unsigned BitIndex;
|
|
if (D.isExternallyVisible()) {
|
|
// Externally visible variables have to be numbered in Sema to properly
|
|
// handle unreachable VarDecls.
|
|
BitIndex = getContext().getManglingNumber(&D);
|
|
assert(BitIndex > 0);
|
|
BitIndex--;
|
|
} else {
|
|
// Non-externally visible variables are numbered here in CodeGen.
|
|
BitIndex = GI.BitIndex++;
|
|
}
|
|
|
|
if (BitIndex >= 32) {
|
|
if (D.isExternallyVisible())
|
|
ErrorUnsupportedABI(CGF, "more than 32 guarded initializations");
|
|
BitIndex %= 32;
|
|
GI.Guard = 0;
|
|
}
|
|
|
|
// Lazily create the i32 bitfield for this function.
|
|
if (!GI.Guard) {
|
|
// Mangle the name for the guard.
|
|
SmallString<256> GuardName;
|
|
{
|
|
llvm::raw_svector_ostream Out(GuardName);
|
|
getMangleContext().mangleStaticGuardVariable(&D, Out);
|
|
Out.flush();
|
|
}
|
|
|
|
// Create the guard variable with a zero-initializer. Just absorb linkage
|
|
// and visibility from the guarded variable.
|
|
GI.Guard = new llvm::GlobalVariable(CGM.getModule(), GuardTy, false,
|
|
GV->getLinkage(), Zero, GuardName.str());
|
|
GI.Guard->setVisibility(GV->getVisibility());
|
|
} else {
|
|
assert(GI.Guard->getLinkage() == GV->getLinkage() &&
|
|
"static local from the same function had different linkage");
|
|
}
|
|
|
|
// Pseudo code for the test:
|
|
// if (!(GuardVar & MyGuardBit)) {
|
|
// GuardVar |= MyGuardBit;
|
|
// ... initialize the object ...;
|
|
// }
|
|
|
|
// Test our bit from the guard variable.
|
|
llvm::ConstantInt *Bit = llvm::ConstantInt::get(GuardTy, 1U << BitIndex);
|
|
llvm::LoadInst *LI = Builder.CreateLoad(GI.Guard);
|
|
llvm::Value *IsInitialized =
|
|
Builder.CreateICmpNE(Builder.CreateAnd(LI, Bit), Zero);
|
|
llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
|
|
llvm::BasicBlock *EndBlock = CGF.createBasicBlock("init.end");
|
|
Builder.CreateCondBr(IsInitialized, EndBlock, InitBlock);
|
|
|
|
// Set our bit in the guard variable and emit the initializer and add a global
|
|
// destructor if appropriate.
|
|
CGF.EmitBlock(InitBlock);
|
|
Builder.CreateStore(Builder.CreateOr(LI, Bit), GI.Guard);
|
|
CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
|
|
Builder.CreateBr(EndBlock);
|
|
|
|
// Continue.
|
|
CGF.EmitBlock(EndBlock);
|
|
}
|
|
|
|
// Member pointer helpers.
|
|
static bool hasVBPtrOffsetField(MSInheritanceModel Inheritance) {
|
|
return Inheritance == MSIM_Unspecified;
|
|
}
|
|
|
|
static bool hasOnlyOneField(bool IsMemberFunction,
|
|
MSInheritanceModel Inheritance) {
|
|
return Inheritance <= MSIM_SinglePolymorphic ||
|
|
(!IsMemberFunction && Inheritance <= MSIM_MultiplePolymorphic);
|
|
}
|
|
|
|
// Only member pointers to functions need a this adjustment, since it can be
|
|
// combined with the field offset for data pointers.
|
|
static bool hasNonVirtualBaseAdjustmentField(bool IsMemberFunction,
|
|
MSInheritanceModel Inheritance) {
|
|
return (IsMemberFunction && Inheritance >= MSIM_Multiple);
|
|
}
|
|
|
|
static bool hasVirtualBaseAdjustmentField(MSInheritanceModel Inheritance) {
|
|
return Inheritance >= MSIM_Virtual;
|
|
}
|
|
|
|
// Use zero for the field offset of a null data member pointer if we can
|
|
// guarantee that zero is not a valid field offset, or if the member pointer has
|
|
// multiple fields. Polymorphic classes have a vfptr at offset zero, so we can
|
|
// use zero for null. If there are multiple fields, we can use zero even if it
|
|
// is a valid field offset because null-ness testing will check the other
|
|
// fields.
|
|
static bool nullFieldOffsetIsZero(MSInheritanceModel Inheritance) {
|
|
return Inheritance != MSIM_Multiple && Inheritance != MSIM_Single;
|
|
}
|
|
|
|
bool MicrosoftCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
|
|
// Null-ness for function memptrs only depends on the first field, which is
|
|
// the function pointer. The rest don't matter, so we can zero initialize.
|
|
if (MPT->isMemberFunctionPointer())
|
|
return true;
|
|
|
|
// The virtual base adjustment field is always -1 for null, so if we have one
|
|
// we can't zero initialize. The field offset is sometimes also -1 if 0 is a
|
|
// valid field offset.
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
return (!hasVirtualBaseAdjustmentField(Inheritance) &&
|
|
nullFieldOffsetIsZero(Inheritance));
|
|
}
|
|
|
|
llvm::Type *
|
|
MicrosoftCXXABI::ConvertMemberPointerType(const MemberPointerType *MPT) {
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
llvm::SmallVector<llvm::Type *, 4> fields;
|
|
if (MPT->isMemberFunctionPointer())
|
|
fields.push_back(CGM.VoidPtrTy); // FunctionPointerOrVirtualThunk
|
|
else
|
|
fields.push_back(CGM.IntTy); // FieldOffset
|
|
|
|
if (hasNonVirtualBaseAdjustmentField(MPT->isMemberFunctionPointer(),
|
|
Inheritance))
|
|
fields.push_back(CGM.IntTy);
|
|
if (hasVBPtrOffsetField(Inheritance))
|
|
fields.push_back(CGM.IntTy);
|
|
if (hasVirtualBaseAdjustmentField(Inheritance))
|
|
fields.push_back(CGM.IntTy); // VirtualBaseAdjustmentOffset
|
|
|
|
if (fields.size() == 1)
|
|
return fields[0];
|
|
return llvm::StructType::get(CGM.getLLVMContext(), fields);
|
|
}
|
|
|
|
void MicrosoftCXXABI::
|
|
GetNullMemberPointerFields(const MemberPointerType *MPT,
|
|
llvm::SmallVectorImpl<llvm::Constant *> &fields) {
|
|
assert(fields.empty());
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
if (MPT->isMemberFunctionPointer()) {
|
|
// FunctionPointerOrVirtualThunk
|
|
fields.push_back(llvm::Constant::getNullValue(CGM.VoidPtrTy));
|
|
} else {
|
|
if (nullFieldOffsetIsZero(Inheritance))
|
|
fields.push_back(getZeroInt()); // FieldOffset
|
|
else
|
|
fields.push_back(getAllOnesInt()); // FieldOffset
|
|
}
|
|
|
|
if (hasNonVirtualBaseAdjustmentField(MPT->isMemberFunctionPointer(),
|
|
Inheritance))
|
|
fields.push_back(getZeroInt());
|
|
if (hasVBPtrOffsetField(Inheritance))
|
|
fields.push_back(getZeroInt());
|
|
if (hasVirtualBaseAdjustmentField(Inheritance))
|
|
fields.push_back(getAllOnesInt());
|
|
}
|
|
|
|
llvm::Constant *
|
|
MicrosoftCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
|
|
llvm::SmallVector<llvm::Constant *, 4> fields;
|
|
GetNullMemberPointerFields(MPT, fields);
|
|
if (fields.size() == 1)
|
|
return fields[0];
|
|
llvm::Constant *Res = llvm::ConstantStruct::getAnon(fields);
|
|
assert(Res->getType() == ConvertMemberPointerType(MPT));
|
|
return Res;
|
|
}
|
|
|
|
llvm::Constant *
|
|
MicrosoftCXXABI::EmitFullMemberPointer(llvm::Constant *FirstField,
|
|
bool IsMemberFunction,
|
|
const CXXRecordDecl *RD,
|
|
CharUnits NonVirtualBaseAdjustment)
|
|
{
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
|
|
// Single inheritance class member pointer are represented as scalars instead
|
|
// of aggregates.
|
|
if (hasOnlyOneField(IsMemberFunction, Inheritance))
|
|
return FirstField;
|
|
|
|
llvm::SmallVector<llvm::Constant *, 4> fields;
|
|
fields.push_back(FirstField);
|
|
|
|
if (hasNonVirtualBaseAdjustmentField(IsMemberFunction, Inheritance))
|
|
fields.push_back(llvm::ConstantInt::get(
|
|
CGM.IntTy, NonVirtualBaseAdjustment.getQuantity()));
|
|
|
|
if (hasVBPtrOffsetField(Inheritance)) {
|
|
CharUnits Offs = CharUnits::Zero();
|
|
if (RD->getNumVBases())
|
|
Offs = GetVBPtrOffsetFromBases(RD);
|
|
fields.push_back(llvm::ConstantInt::get(CGM.IntTy, Offs.getQuantity()));
|
|
}
|
|
|
|
// The rest of the fields are adjusted by conversions to a more derived class.
|
|
if (hasVirtualBaseAdjustmentField(Inheritance))
|
|
fields.push_back(getZeroInt());
|
|
|
|
return llvm::ConstantStruct::getAnon(fields);
|
|
}
|
|
|
|
llvm::Constant *
|
|
MicrosoftCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
|
|
CharUnits offset) {
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
llvm::Constant *FirstField =
|
|
llvm::ConstantInt::get(CGM.IntTy, offset.getQuantity());
|
|
return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/false, RD,
|
|
CharUnits::Zero());
|
|
}
|
|
|
|
llvm::Constant *MicrosoftCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
|
|
return BuildMemberPointer(MD->getParent(), MD, CharUnits::Zero());
|
|
}
|
|
|
|
llvm::Constant *MicrosoftCXXABI::EmitMemberPointer(const APValue &MP,
|
|
QualType MPType) {
|
|
const MemberPointerType *MPT = MPType->castAs<MemberPointerType>();
|
|
const ValueDecl *MPD = MP.getMemberPointerDecl();
|
|
if (!MPD)
|
|
return EmitNullMemberPointer(MPT);
|
|
|
|
CharUnits ThisAdjustment = getMemberPointerPathAdjustment(MP);
|
|
|
|
// FIXME PR15713: Support virtual inheritance paths.
|
|
|
|
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MPD))
|
|
return BuildMemberPointer(MPT->getClass()->getAsCXXRecordDecl(),
|
|
MD, ThisAdjustment);
|
|
|
|
CharUnits FieldOffset =
|
|
getContext().toCharUnitsFromBits(getContext().getFieldOffset(MPD));
|
|
return EmitMemberDataPointer(MPT, ThisAdjustment + FieldOffset);
|
|
}
|
|
|
|
llvm::Constant *
|
|
MicrosoftCXXABI::BuildMemberPointer(const CXXRecordDecl *RD,
|
|
const CXXMethodDecl *MD,
|
|
CharUnits NonVirtualBaseAdjustment) {
|
|
assert(MD->isInstance() && "Member function must not be static!");
|
|
MD = MD->getCanonicalDecl();
|
|
CodeGenTypes &Types = CGM.getTypes();
|
|
|
|
llvm::Constant *FirstField;
|
|
if (!MD->isVirtual()) {
|
|
const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
|
|
llvm::Type *Ty;
|
|
// Check whether the function has a computable LLVM signature.
|
|
if (Types.isFuncTypeConvertible(FPT)) {
|
|
// The function has a computable LLVM signature; use the correct type.
|
|
Ty = Types.GetFunctionType(Types.arrangeCXXMethodDeclaration(MD));
|
|
} else {
|
|
// Use an arbitrary non-function type to tell GetAddrOfFunction that the
|
|
// function type is incomplete.
|
|
Ty = CGM.PtrDiffTy;
|
|
}
|
|
FirstField = CGM.GetAddrOfFunction(MD, Ty);
|
|
FirstField = llvm::ConstantExpr::getBitCast(FirstField, CGM.VoidPtrTy);
|
|
} else {
|
|
MicrosoftVTableContext::MethodVFTableLocation ML =
|
|
CGM.getMicrosoftVTableContext().getMethodVFTableLocation(MD);
|
|
if (MD->isVariadic()) {
|
|
CGM.ErrorUnsupported(MD, "pointer to variadic virtual member function");
|
|
FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
|
|
} else if (!CGM.getTypes().isFuncTypeConvertible(
|
|
MD->getType()->castAs<FunctionType>())) {
|
|
CGM.ErrorUnsupported(MD, "pointer to virtual member function with "
|
|
"incomplete return or parameter type");
|
|
FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
|
|
} else if (ML.VBase) {
|
|
CGM.ErrorUnsupported(MD, "pointer to virtual member function overriding "
|
|
"member function in virtual base class");
|
|
FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
|
|
} else {
|
|
SmallString<256> ThunkName;
|
|
int OffsetInVFTable =
|
|
ML.Index *
|
|
getContext().getTypeSizeInChars(getContext().VoidPtrTy).getQuantity();
|
|
llvm::raw_svector_ostream Out(ThunkName);
|
|
getMangleContext().mangleVirtualMemPtrThunk(MD, OffsetInVFTable, Out);
|
|
Out.flush();
|
|
|
|
llvm::Function *Thunk = EmitVirtualMemPtrThunk(MD, ThunkName.str());
|
|
FirstField = llvm::ConstantExpr::getBitCast(Thunk, CGM.VoidPtrTy);
|
|
}
|
|
}
|
|
|
|
// The rest of the fields are common with data member pointers.
|
|
return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/true, RD,
|
|
NonVirtualBaseAdjustment);
|
|
}
|
|
|
|
/// Member pointers are the same if they're either bitwise identical *or* both
|
|
/// null. Null-ness for function members is determined by the first field,
|
|
/// while for data member pointers we must compare all fields.
|
|
llvm::Value *
|
|
MicrosoftCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
|
|
llvm::Value *L,
|
|
llvm::Value *R,
|
|
const MemberPointerType *MPT,
|
|
bool Inequality) {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
|
|
// Handle != comparisons by switching the sense of all boolean operations.
|
|
llvm::ICmpInst::Predicate Eq;
|
|
llvm::Instruction::BinaryOps And, Or;
|
|
if (Inequality) {
|
|
Eq = llvm::ICmpInst::ICMP_NE;
|
|
And = llvm::Instruction::Or;
|
|
Or = llvm::Instruction::And;
|
|
} else {
|
|
Eq = llvm::ICmpInst::ICMP_EQ;
|
|
And = llvm::Instruction::And;
|
|
Or = llvm::Instruction::Or;
|
|
}
|
|
|
|
// If this is a single field member pointer (single inheritance), this is a
|
|
// single icmp.
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
if (hasOnlyOneField(MPT->isMemberFunctionPointer(), Inheritance))
|
|
return Builder.CreateICmp(Eq, L, R);
|
|
|
|
// Compare the first field.
|
|
llvm::Value *L0 = Builder.CreateExtractValue(L, 0, "lhs.0");
|
|
llvm::Value *R0 = Builder.CreateExtractValue(R, 0, "rhs.0");
|
|
llvm::Value *Cmp0 = Builder.CreateICmp(Eq, L0, R0, "memptr.cmp.first");
|
|
|
|
// Compare everything other than the first field.
|
|
llvm::Value *Res = 0;
|
|
llvm::StructType *LType = cast<llvm::StructType>(L->getType());
|
|
for (unsigned I = 1, E = LType->getNumElements(); I != E; ++I) {
|
|
llvm::Value *LF = Builder.CreateExtractValue(L, I);
|
|
llvm::Value *RF = Builder.CreateExtractValue(R, I);
|
|
llvm::Value *Cmp = Builder.CreateICmp(Eq, LF, RF, "memptr.cmp.rest");
|
|
if (Res)
|
|
Res = Builder.CreateBinOp(And, Res, Cmp);
|
|
else
|
|
Res = Cmp;
|
|
}
|
|
|
|
// Check if the first field is 0 if this is a function pointer.
|
|
if (MPT->isMemberFunctionPointer()) {
|
|
// (l1 == r1 && ...) || l0 == 0
|
|
llvm::Value *Zero = llvm::Constant::getNullValue(L0->getType());
|
|
llvm::Value *IsZero = Builder.CreateICmp(Eq, L0, Zero, "memptr.cmp.iszero");
|
|
Res = Builder.CreateBinOp(Or, Res, IsZero);
|
|
}
|
|
|
|
// Combine the comparison of the first field, which must always be true for
|
|
// this comparison to succeeed.
|
|
return Builder.CreateBinOp(And, Res, Cmp0, "memptr.cmp");
|
|
}
|
|
|
|
llvm::Value *
|
|
MicrosoftCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
|
|
llvm::Value *MemPtr,
|
|
const MemberPointerType *MPT) {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::SmallVector<llvm::Constant *, 4> fields;
|
|
// We only need one field for member functions.
|
|
if (MPT->isMemberFunctionPointer())
|
|
fields.push_back(llvm::Constant::getNullValue(CGM.VoidPtrTy));
|
|
else
|
|
GetNullMemberPointerFields(MPT, fields);
|
|
assert(!fields.empty());
|
|
llvm::Value *FirstField = MemPtr;
|
|
if (MemPtr->getType()->isStructTy())
|
|
FirstField = Builder.CreateExtractValue(MemPtr, 0);
|
|
llvm::Value *Res = Builder.CreateICmpNE(FirstField, fields[0], "memptr.cmp0");
|
|
|
|
// For function member pointers, we only need to test the function pointer
|
|
// field. The other fields if any can be garbage.
|
|
if (MPT->isMemberFunctionPointer())
|
|
return Res;
|
|
|
|
// Otherwise, emit a series of compares and combine the results.
|
|
for (int I = 1, E = fields.size(); I < E; ++I) {
|
|
llvm::Value *Field = Builder.CreateExtractValue(MemPtr, I);
|
|
llvm::Value *Next = Builder.CreateICmpNE(Field, fields[I], "memptr.cmp");
|
|
Res = Builder.CreateAnd(Res, Next, "memptr.tobool");
|
|
}
|
|
return Res;
|
|
}
|
|
|
|
bool MicrosoftCXXABI::MemberPointerConstantIsNull(const MemberPointerType *MPT,
|
|
llvm::Constant *Val) {
|
|
// Function pointers are null if the pointer in the first field is null.
|
|
if (MPT->isMemberFunctionPointer()) {
|
|
llvm::Constant *FirstField = Val->getType()->isStructTy() ?
|
|
Val->getAggregateElement(0U) : Val;
|
|
return FirstField->isNullValue();
|
|
}
|
|
|
|
// If it's not a function pointer and it's zero initializable, we can easily
|
|
// check zero.
|
|
if (isZeroInitializable(MPT) && Val->isNullValue())
|
|
return true;
|
|
|
|
// Otherwise, break down all the fields for comparison. Hopefully these
|
|
// little Constants are reused, while a big null struct might not be.
|
|
llvm::SmallVector<llvm::Constant *, 4> Fields;
|
|
GetNullMemberPointerFields(MPT, Fields);
|
|
if (Fields.size() == 1) {
|
|
assert(Val->getType()->isIntegerTy());
|
|
return Val == Fields[0];
|
|
}
|
|
|
|
unsigned I, E;
|
|
for (I = 0, E = Fields.size(); I != E; ++I) {
|
|
if (Val->getAggregateElement(I) != Fields[I])
|
|
break;
|
|
}
|
|
return I == E;
|
|
}
|
|
|
|
llvm::Value *
|
|
MicrosoftCXXABI::GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
|
|
llvm::Value *This,
|
|
llvm::Value *VBPtrOffset,
|
|
llvm::Value *VBTableOffset,
|
|
llvm::Value **VBPtrOut) {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
// Load the vbtable pointer from the vbptr in the instance.
|
|
This = Builder.CreateBitCast(This, CGM.Int8PtrTy);
|
|
llvm::Value *VBPtr =
|
|
Builder.CreateInBoundsGEP(This, VBPtrOffset, "vbptr");
|
|
if (VBPtrOut) *VBPtrOut = VBPtr;
|
|
VBPtr = Builder.CreateBitCast(VBPtr, CGM.Int8PtrTy->getPointerTo(0));
|
|
llvm::Value *VBTable = Builder.CreateLoad(VBPtr, "vbtable");
|
|
|
|
// Load an i32 offset from the vb-table.
|
|
llvm::Value *VBaseOffs = Builder.CreateInBoundsGEP(VBTable, VBTableOffset);
|
|
VBaseOffs = Builder.CreateBitCast(VBaseOffs, CGM.Int32Ty->getPointerTo(0));
|
|
return Builder.CreateLoad(VBaseOffs, "vbase_offs");
|
|
}
|
|
|
|
// Returns an adjusted base cast to i8*, since we do more address arithmetic on
|
|
// it.
|
|
llvm::Value *
|
|
MicrosoftCXXABI::AdjustVirtualBase(CodeGenFunction &CGF,
|
|
const CXXRecordDecl *RD, llvm::Value *Base,
|
|
llvm::Value *VBTableOffset,
|
|
llvm::Value *VBPtrOffset) {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
Base = Builder.CreateBitCast(Base, CGM.Int8PtrTy);
|
|
llvm::BasicBlock *OriginalBB = 0;
|
|
llvm::BasicBlock *SkipAdjustBB = 0;
|
|
llvm::BasicBlock *VBaseAdjustBB = 0;
|
|
|
|
// In the unspecified inheritance model, there might not be a vbtable at all,
|
|
// in which case we need to skip the virtual base lookup. If there is a
|
|
// vbtable, the first entry is a no-op entry that gives back the original
|
|
// base, so look for a virtual base adjustment offset of zero.
|
|
if (VBPtrOffset) {
|
|
OriginalBB = Builder.GetInsertBlock();
|
|
VBaseAdjustBB = CGF.createBasicBlock("memptr.vadjust");
|
|
SkipAdjustBB = CGF.createBasicBlock("memptr.skip_vadjust");
|
|
llvm::Value *IsVirtual =
|
|
Builder.CreateICmpNE(VBTableOffset, getZeroInt(),
|
|
"memptr.is_vbase");
|
|
Builder.CreateCondBr(IsVirtual, VBaseAdjustBB, SkipAdjustBB);
|
|
CGF.EmitBlock(VBaseAdjustBB);
|
|
}
|
|
|
|
// If we weren't given a dynamic vbptr offset, RD should be complete and we'll
|
|
// know the vbptr offset.
|
|
if (!VBPtrOffset) {
|
|
CharUnits offs = CharUnits::Zero();
|
|
if (RD->getNumVBases()) {
|
|
offs = GetVBPtrOffsetFromBases(RD);
|
|
}
|
|
VBPtrOffset = llvm::ConstantInt::get(CGM.IntTy, offs.getQuantity());
|
|
}
|
|
llvm::Value *VBPtr = 0;
|
|
llvm::Value *VBaseOffs =
|
|
GetVBaseOffsetFromVBPtr(CGF, Base, VBPtrOffset, VBTableOffset, &VBPtr);
|
|
llvm::Value *AdjustedBase = Builder.CreateInBoundsGEP(VBPtr, VBaseOffs);
|
|
|
|
// Merge control flow with the case where we didn't have to adjust.
|
|
if (VBaseAdjustBB) {
|
|
Builder.CreateBr(SkipAdjustBB);
|
|
CGF.EmitBlock(SkipAdjustBB);
|
|
llvm::PHINode *Phi = Builder.CreatePHI(CGM.Int8PtrTy, 2, "memptr.base");
|
|
Phi->addIncoming(Base, OriginalBB);
|
|
Phi->addIncoming(AdjustedBase, VBaseAdjustBB);
|
|
return Phi;
|
|
}
|
|
return AdjustedBase;
|
|
}
|
|
|
|
llvm::Value *
|
|
MicrosoftCXXABI::EmitMemberDataPointerAddress(CodeGenFunction &CGF,
|
|
llvm::Value *Base,
|
|
llvm::Value *MemPtr,
|
|
const MemberPointerType *MPT) {
|
|
assert(MPT->isMemberDataPointer());
|
|
unsigned AS = Base->getType()->getPointerAddressSpace();
|
|
llvm::Type *PType =
|
|
CGF.ConvertTypeForMem(MPT->getPointeeType())->getPointerTo(AS);
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
|
|
// Extract the fields we need, regardless of model. We'll apply them if we
|
|
// have them.
|
|
llvm::Value *FieldOffset = MemPtr;
|
|
llvm::Value *VirtualBaseAdjustmentOffset = 0;
|
|
llvm::Value *VBPtrOffset = 0;
|
|
if (MemPtr->getType()->isStructTy()) {
|
|
// We need to extract values.
|
|
unsigned I = 0;
|
|
FieldOffset = Builder.CreateExtractValue(MemPtr, I++);
|
|
if (hasVBPtrOffsetField(Inheritance))
|
|
VBPtrOffset = Builder.CreateExtractValue(MemPtr, I++);
|
|
if (hasVirtualBaseAdjustmentField(Inheritance))
|
|
VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(MemPtr, I++);
|
|
}
|
|
|
|
if (VirtualBaseAdjustmentOffset) {
|
|
Base = AdjustVirtualBase(CGF, RD, Base, VirtualBaseAdjustmentOffset,
|
|
VBPtrOffset);
|
|
}
|
|
llvm::Value *Addr =
|
|
Builder.CreateInBoundsGEP(Base, FieldOffset, "memptr.offset");
|
|
|
|
// Cast the address to the appropriate pointer type, adopting the address
|
|
// space of the base pointer.
|
|
return Builder.CreateBitCast(Addr, PType);
|
|
}
|
|
|
|
static MSInheritanceModel
|
|
getInheritanceFromMemptr(const MemberPointerType *MPT) {
|
|
return MPT->getClass()->getAsCXXRecordDecl()->getMSInheritanceModel();
|
|
}
|
|
|
|
llvm::Value *
|
|
MicrosoftCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
|
|
const CastExpr *E,
|
|
llvm::Value *Src) {
|
|
assert(E->getCastKind() == CK_DerivedToBaseMemberPointer ||
|
|
E->getCastKind() == CK_BaseToDerivedMemberPointer ||
|
|
E->getCastKind() == CK_ReinterpretMemberPointer);
|
|
|
|
// Use constant emission if we can.
|
|
if (isa<llvm::Constant>(Src))
|
|
return EmitMemberPointerConversion(E, cast<llvm::Constant>(Src));
|
|
|
|
// We may be adding or dropping fields from the member pointer, so we need
|
|
// both types and the inheritance models of both records.
|
|
const MemberPointerType *SrcTy =
|
|
E->getSubExpr()->getType()->castAs<MemberPointerType>();
|
|
const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
|
|
MSInheritanceModel SrcInheritance = getInheritanceFromMemptr(SrcTy);
|
|
MSInheritanceModel DstInheritance = getInheritanceFromMemptr(DstTy);
|
|
bool IsFunc = SrcTy->isMemberFunctionPointer();
|
|
|
|
// If the classes use the same null representation, reinterpret_cast is a nop.
|
|
bool IsReinterpret = E->getCastKind() == CK_ReinterpretMemberPointer;
|
|
if (IsReinterpret && (IsFunc ||
|
|
nullFieldOffsetIsZero(SrcInheritance) ==
|
|
nullFieldOffsetIsZero(DstInheritance)))
|
|
return Src;
|
|
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
|
|
// Branch past the conversion if Src is null.
|
|
llvm::Value *IsNotNull = EmitMemberPointerIsNotNull(CGF, Src, SrcTy);
|
|
llvm::Constant *DstNull = EmitNullMemberPointer(DstTy);
|
|
|
|
// C++ 5.2.10p9: The null member pointer value is converted to the null member
|
|
// pointer value of the destination type.
|
|
if (IsReinterpret) {
|
|
// For reinterpret casts, sema ensures that src and dst are both functions
|
|
// or data and have the same size, which means the LLVM types should match.
|
|
assert(Src->getType() == DstNull->getType());
|
|
return Builder.CreateSelect(IsNotNull, Src, DstNull);
|
|
}
|
|
|
|
llvm::BasicBlock *OriginalBB = Builder.GetInsertBlock();
|
|
llvm::BasicBlock *ConvertBB = CGF.createBasicBlock("memptr.convert");
|
|
llvm::BasicBlock *ContinueBB = CGF.createBasicBlock("memptr.converted");
|
|
Builder.CreateCondBr(IsNotNull, ConvertBB, ContinueBB);
|
|
CGF.EmitBlock(ConvertBB);
|
|
|
|
// Decompose src.
|
|
llvm::Value *FirstField = Src;
|
|
llvm::Value *NonVirtualBaseAdjustment = 0;
|
|
llvm::Value *VirtualBaseAdjustmentOffset = 0;
|
|
llvm::Value *VBPtrOffset = 0;
|
|
if (!hasOnlyOneField(IsFunc, SrcInheritance)) {
|
|
// We need to extract values.
|
|
unsigned I = 0;
|
|
FirstField = Builder.CreateExtractValue(Src, I++);
|
|
if (hasNonVirtualBaseAdjustmentField(IsFunc, SrcInheritance))
|
|
NonVirtualBaseAdjustment = Builder.CreateExtractValue(Src, I++);
|
|
if (hasVBPtrOffsetField(SrcInheritance))
|
|
VBPtrOffset = Builder.CreateExtractValue(Src, I++);
|
|
if (hasVirtualBaseAdjustmentField(SrcInheritance))
|
|
VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(Src, I++);
|
|
}
|
|
|
|
// For data pointers, we adjust the field offset directly. For functions, we
|
|
// have a separate field.
|
|
llvm::Constant *Adj = getMemberPointerAdjustment(E);
|
|
if (Adj) {
|
|
Adj = llvm::ConstantExpr::getTruncOrBitCast(Adj, CGM.IntTy);
|
|
llvm::Value *&NVAdjustField = IsFunc ? NonVirtualBaseAdjustment : FirstField;
|
|
bool isDerivedToBase = (E->getCastKind() == CK_DerivedToBaseMemberPointer);
|
|
if (!NVAdjustField) // If this field didn't exist in src, it's zero.
|
|
NVAdjustField = getZeroInt();
|
|
if (isDerivedToBase)
|
|
NVAdjustField = Builder.CreateNSWSub(NVAdjustField, Adj, "adj");
|
|
else
|
|
NVAdjustField = Builder.CreateNSWAdd(NVAdjustField, Adj, "adj");
|
|
}
|
|
|
|
// FIXME PR15713: Support conversions through virtually derived classes.
|
|
|
|
// Recompose dst from the null struct and the adjusted fields from src.
|
|
llvm::Value *Dst;
|
|
if (hasOnlyOneField(IsFunc, DstInheritance)) {
|
|
Dst = FirstField;
|
|
} else {
|
|
Dst = llvm::UndefValue::get(DstNull->getType());
|
|
unsigned Idx = 0;
|
|
Dst = Builder.CreateInsertValue(Dst, FirstField, Idx++);
|
|
if (hasNonVirtualBaseAdjustmentField(IsFunc, DstInheritance))
|
|
Dst = Builder.CreateInsertValue(
|
|
Dst, getValueOrZeroInt(NonVirtualBaseAdjustment), Idx++);
|
|
if (hasVBPtrOffsetField(DstInheritance))
|
|
Dst = Builder.CreateInsertValue(
|
|
Dst, getValueOrZeroInt(VBPtrOffset), Idx++);
|
|
if (hasVirtualBaseAdjustmentField(DstInheritance))
|
|
Dst = Builder.CreateInsertValue(
|
|
Dst, getValueOrZeroInt(VirtualBaseAdjustmentOffset), Idx++);
|
|
}
|
|
Builder.CreateBr(ContinueBB);
|
|
|
|
// In the continuation, choose between DstNull and Dst.
|
|
CGF.EmitBlock(ContinueBB);
|
|
llvm::PHINode *Phi = Builder.CreatePHI(DstNull->getType(), 2, "memptr.converted");
|
|
Phi->addIncoming(DstNull, OriginalBB);
|
|
Phi->addIncoming(Dst, ConvertBB);
|
|
return Phi;
|
|
}
|
|
|
|
llvm::Constant *
|
|
MicrosoftCXXABI::EmitMemberPointerConversion(const CastExpr *E,
|
|
llvm::Constant *Src) {
|
|
const MemberPointerType *SrcTy =
|
|
E->getSubExpr()->getType()->castAs<MemberPointerType>();
|
|
const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
|
|
|
|
// If src is null, emit a new null for dst. We can't return src because dst
|
|
// might have a new representation.
|
|
if (MemberPointerConstantIsNull(SrcTy, Src))
|
|
return EmitNullMemberPointer(DstTy);
|
|
|
|
// We don't need to do anything for reinterpret_casts of non-null member
|
|
// pointers. We should only get here when the two type representations have
|
|
// the same size.
|
|
if (E->getCastKind() == CK_ReinterpretMemberPointer)
|
|
return Src;
|
|
|
|
MSInheritanceModel SrcInheritance = getInheritanceFromMemptr(SrcTy);
|
|
MSInheritanceModel DstInheritance = getInheritanceFromMemptr(DstTy);
|
|
|
|
// Decompose src.
|
|
llvm::Constant *FirstField = Src;
|
|
llvm::Constant *NonVirtualBaseAdjustment = 0;
|
|
llvm::Constant *VirtualBaseAdjustmentOffset = 0;
|
|
llvm::Constant *VBPtrOffset = 0;
|
|
bool IsFunc = SrcTy->isMemberFunctionPointer();
|
|
if (!hasOnlyOneField(IsFunc, SrcInheritance)) {
|
|
// We need to extract values.
|
|
unsigned I = 0;
|
|
FirstField = Src->getAggregateElement(I++);
|
|
if (hasNonVirtualBaseAdjustmentField(IsFunc, SrcInheritance))
|
|
NonVirtualBaseAdjustment = Src->getAggregateElement(I++);
|
|
if (hasVBPtrOffsetField(SrcInheritance))
|
|
VBPtrOffset = Src->getAggregateElement(I++);
|
|
if (hasVirtualBaseAdjustmentField(SrcInheritance))
|
|
VirtualBaseAdjustmentOffset = Src->getAggregateElement(I++);
|
|
}
|
|
|
|
// For data pointers, we adjust the field offset directly. For functions, we
|
|
// have a separate field.
|
|
llvm::Constant *Adj = getMemberPointerAdjustment(E);
|
|
if (Adj) {
|
|
Adj = llvm::ConstantExpr::getTruncOrBitCast(Adj, CGM.IntTy);
|
|
llvm::Constant *&NVAdjustField =
|
|
IsFunc ? NonVirtualBaseAdjustment : FirstField;
|
|
bool IsDerivedToBase = (E->getCastKind() == CK_DerivedToBaseMemberPointer);
|
|
if (!NVAdjustField) // If this field didn't exist in src, it's zero.
|
|
NVAdjustField = getZeroInt();
|
|
if (IsDerivedToBase)
|
|
NVAdjustField = llvm::ConstantExpr::getNSWSub(NVAdjustField, Adj);
|
|
else
|
|
NVAdjustField = llvm::ConstantExpr::getNSWAdd(NVAdjustField, Adj);
|
|
}
|
|
|
|
// FIXME PR15713: Support conversions through virtually derived classes.
|
|
|
|
// Recompose dst from the null struct and the adjusted fields from src.
|
|
if (hasOnlyOneField(IsFunc, DstInheritance))
|
|
return FirstField;
|
|
|
|
llvm::SmallVector<llvm::Constant *, 4> Fields;
|
|
Fields.push_back(FirstField);
|
|
if (hasNonVirtualBaseAdjustmentField(IsFunc, DstInheritance))
|
|
Fields.push_back(getConstantOrZeroInt(NonVirtualBaseAdjustment));
|
|
if (hasVBPtrOffsetField(DstInheritance))
|
|
Fields.push_back(getConstantOrZeroInt(VBPtrOffset));
|
|
if (hasVirtualBaseAdjustmentField(DstInheritance))
|
|
Fields.push_back(getConstantOrZeroInt(VirtualBaseAdjustmentOffset));
|
|
return llvm::ConstantStruct::getAnon(Fields);
|
|
}
|
|
|
|
llvm::Value *
|
|
MicrosoftCXXABI::EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
|
|
llvm::Value *&This,
|
|
llvm::Value *MemPtr,
|
|
const MemberPointerType *MPT) {
|
|
assert(MPT->isMemberFunctionPointer());
|
|
const FunctionProtoType *FPT =
|
|
MPT->getPointeeType()->castAs<FunctionProtoType>();
|
|
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
|
|
llvm::FunctionType *FTy =
|
|
CGM.getTypes().GetFunctionType(
|
|
CGM.getTypes().arrangeCXXMethodType(RD, FPT));
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
|
|
|
// Extract the fields we need, regardless of model. We'll apply them if we
|
|
// have them.
|
|
llvm::Value *FunctionPointer = MemPtr;
|
|
llvm::Value *NonVirtualBaseAdjustment = NULL;
|
|
llvm::Value *VirtualBaseAdjustmentOffset = NULL;
|
|
llvm::Value *VBPtrOffset = NULL;
|
|
if (MemPtr->getType()->isStructTy()) {
|
|
// We need to extract values.
|
|
unsigned I = 0;
|
|
FunctionPointer = Builder.CreateExtractValue(MemPtr, I++);
|
|
if (hasNonVirtualBaseAdjustmentField(MPT, Inheritance))
|
|
NonVirtualBaseAdjustment = Builder.CreateExtractValue(MemPtr, I++);
|
|
if (hasVBPtrOffsetField(Inheritance))
|
|
VBPtrOffset = Builder.CreateExtractValue(MemPtr, I++);
|
|
if (hasVirtualBaseAdjustmentField(Inheritance))
|
|
VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(MemPtr, I++);
|
|
}
|
|
|
|
if (VirtualBaseAdjustmentOffset) {
|
|
This = AdjustVirtualBase(CGF, RD, This, VirtualBaseAdjustmentOffset,
|
|
VBPtrOffset);
|
|
}
|
|
|
|
if (NonVirtualBaseAdjustment) {
|
|
// Apply the adjustment and cast back to the original struct type.
|
|
llvm::Value *Ptr = Builder.CreateBitCast(This, Builder.getInt8PtrTy());
|
|
Ptr = Builder.CreateInBoundsGEP(Ptr, NonVirtualBaseAdjustment);
|
|
This = Builder.CreateBitCast(Ptr, This->getType(), "this.adjusted");
|
|
}
|
|
|
|
return Builder.CreateBitCast(FunctionPointer, FTy->getPointerTo());
|
|
}
|
|
|
|
CGCXXABI *clang::CodeGen::CreateMicrosoftCXXABI(CodeGenModule &CGM) {
|
|
return new MicrosoftCXXABI(CGM);
|
|
}
|