299 lines
10 KiB
C++
299 lines
10 KiB
C++
|
//===------- MicrosoftCXXABI.cpp - AST support for the Microsoft C++ ABI --===//
|
||
|
|
//
|
||
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
||
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
||
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// This provides C++ AST support targeting the Microsoft Visual C++
|
||
|
|
// ABI.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "CXXABI.h"
|
||
|
|
#include "clang/AST/ASTContext.h"
|
||
|
|
#include "clang/AST/Attr.h"
|
||
|
|
#include "clang/AST/CXXInheritance.h"
|
||
|
|
#include "clang/AST/DeclCXX.h"
|
||
|
|
#include "clang/AST/Mangle.h"
|
||
|
|
#include "clang/AST/MangleNumberingContext.h"
|
||
|
|
#include "clang/AST/RecordLayout.h"
|
||
|
|
#include "clang/AST/Type.h"
|
||
|
|
#include "clang/Basic/TargetInfo.h"
|
||
|
|
|
||
|
|
using namespace clang;
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
/// Numbers things which need to correspond across multiple TUs.
|
||
|
|
/// Typically these are things like static locals, lambdas, or blocks.
|
||
|
|
class MicrosoftNumberingContext : public MangleNumberingContext {
|
||
|
|
llvm::DenseMap<const Type *, unsigned> ManglingNumbers;
|
||
|
|
unsigned LambdaManglingNumber;
|
||
|
|
unsigned StaticLocalNumber;
|
||
|
|
unsigned StaticThreadlocalNumber;
|
||
|
|
|
||
|
|
public:
|
||
|
|
MicrosoftNumberingContext()
|
||
|
|
: MangleNumberingContext(), LambdaManglingNumber(0),
|
||
|
|
StaticLocalNumber(0), StaticThreadlocalNumber(0) {}
|
||
|
|
|
||
|
|
unsigned getManglingNumber(const CXXMethodDecl *CallOperator) override {
|
||
|
|
return ++LambdaManglingNumber;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned getManglingNumber(const BlockDecl *BD) override {
|
||
|
|
const Type *Ty = nullptr;
|
||
|
|
return ++ManglingNumbers[Ty];
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned getStaticLocalNumber(const VarDecl *VD) override {
|
||
|
|
if (VD->getTLSKind())
|
||
|
|
return ++StaticThreadlocalNumber;
|
||
|
|
return ++StaticLocalNumber;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned getManglingNumber(const VarDecl *VD,
|
||
|
|
unsigned MSLocalManglingNumber) override {
|
||
|
|
return MSLocalManglingNumber;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned getManglingNumber(const TagDecl *TD,
|
||
|
|
unsigned MSLocalManglingNumber) override {
|
||
|
|
return MSLocalManglingNumber;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
class MSHIPNumberingContext : public MicrosoftNumberingContext {
|
||
|
|
std::unique_ptr<MangleNumberingContext> DeviceCtx;
|
||
|
|
|
||
|
|
public:
|
||
|
|
MSHIPNumberingContext(MangleContext *DeviceMangler) {
|
||
|
|
DeviceCtx = createItaniumNumberingContext(DeviceMangler);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned getDeviceManglingNumber(const CXXMethodDecl *CallOperator) override {
|
||
|
|
return DeviceCtx->getManglingNumber(CallOperator);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
class MicrosoftCXXABI : public CXXABI {
|
||
|
|
ASTContext &Context;
|
||
|
|
llvm::SmallDenseMap<CXXRecordDecl *, CXXConstructorDecl *> RecordToCopyCtor;
|
||
|
|
|
||
|
|
llvm::SmallDenseMap<TagDecl *, DeclaratorDecl *>
|
||
|
|
UnnamedTagDeclToDeclaratorDecl;
|
||
|
|
llvm::SmallDenseMap<TagDecl *, TypedefNameDecl *>
|
||
|
|
UnnamedTagDeclToTypedefNameDecl;
|
||
|
|
|
||
|
|
// MangleContext for device numbering context, which is based on Itanium C++
|
||
|
|
// ABI.
|
||
|
|
std::unique_ptr<MangleContext> DeviceMangler;
|
||
|
|
|
||
|
|
public:
|
||
|
|
MicrosoftCXXABI(ASTContext &Ctx) : Context(Ctx) {
|
||
|
|
if (Context.getLangOpts().CUDA && Context.getAuxTargetInfo()) {
|
||
|
|
assert(Context.getTargetInfo().getCXXABI().isMicrosoft() &&
|
||
|
|
Context.getAuxTargetInfo()->getCXXABI().isItaniumFamily() &&
|
||
|
|
"Unexpected combination of C++ ABIs.");
|
||
|
|
DeviceMangler.reset(
|
||
|
|
Context.createMangleContext(Context.getAuxTargetInfo()));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
MemberPointerInfo
|
||
|
|
getMemberPointerInfo(const MemberPointerType *MPT) const override;
|
||
|
|
|
||
|
|
CallingConv getDefaultMethodCallConv(bool isVariadic) const override {
|
||
|
|
if (!isVariadic &&
|
||
|
|
Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
|
||
|
|
return CC_X86ThisCall;
|
||
|
|
return Context.getTargetInfo().getDefaultCallingConv();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool isNearlyEmpty(const CXXRecordDecl *RD) const override {
|
||
|
|
llvm_unreachable("unapplicable to the MS ABI");
|
||
|
|
}
|
||
|
|
|
||
|
|
const CXXConstructorDecl *
|
||
|
|
getCopyConstructorForExceptionObject(CXXRecordDecl *RD) override {
|
||
|
|
return RecordToCopyCtor[RD];
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
addCopyConstructorForExceptionObject(CXXRecordDecl *RD,
|
||
|
|
CXXConstructorDecl *CD) override {
|
||
|
|
assert(CD != nullptr);
|
||
|
|
assert(RecordToCopyCtor[RD] == nullptr || RecordToCopyCtor[RD] == CD);
|
||
|
|
RecordToCopyCtor[RD] = CD;
|
||
|
|
}
|
||
|
|
|
||
|
|
void addTypedefNameForUnnamedTagDecl(TagDecl *TD,
|
||
|
|
TypedefNameDecl *DD) override {
|
||
|
|
TD = TD->getCanonicalDecl();
|
||
|
|
DD = DD->getCanonicalDecl();
|
||
|
|
TypedefNameDecl *&I = UnnamedTagDeclToTypedefNameDecl[TD];
|
||
|
|
if (!I)
|
||
|
|
I = DD;
|
||
|
|
}
|
||
|
|
|
||
|
|
TypedefNameDecl *getTypedefNameForUnnamedTagDecl(const TagDecl *TD) override {
|
||
|
|
return UnnamedTagDeclToTypedefNameDecl.lookup(
|
||
|
|
const_cast<TagDecl *>(TD->getCanonicalDecl()));
|
||
|
|
}
|
||
|
|
|
||
|
|
void addDeclaratorForUnnamedTagDecl(TagDecl *TD,
|
||
|
|
DeclaratorDecl *DD) override {
|
||
|
|
TD = TD->getCanonicalDecl();
|
||
|
|
DD = cast<DeclaratorDecl>(DD->getCanonicalDecl());
|
||
|
|
DeclaratorDecl *&I = UnnamedTagDeclToDeclaratorDecl[TD];
|
||
|
|
if (!I)
|
||
|
|
I = DD;
|
||
|
|
}
|
||
|
|
|
||
|
|
DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) override {
|
||
|
|
return UnnamedTagDeclToDeclaratorDecl.lookup(
|
||
|
|
const_cast<TagDecl *>(TD->getCanonicalDecl()));
|
||
|
|
}
|
||
|
|
|
||
|
|
std::unique_ptr<MangleNumberingContext>
|
||
|
|
createMangleNumberingContext() const override {
|
||
|
|
if (Context.getLangOpts().CUDA && Context.getAuxTargetInfo()) {
|
||
|
|
assert(DeviceMangler && "Missing device mangler");
|
||
|
|
return std::make_unique<MSHIPNumberingContext>(DeviceMangler.get());
|
||
|
|
}
|
||
|
|
return std::make_unique<MicrosoftNumberingContext>();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// getNumBases() seems to only give us the number of direct bases, and not the
|
||
|
|
// total. This function tells us if we inherit from anybody that uses MI, or if
|
||
|
|
// we have a non-primary base class, which uses the multiple inheritance model.
|
||
|
|
static bool usesMultipleInheritanceModel(const CXXRecordDecl *RD) {
|
||
|
|
while (RD->getNumBases() > 0) {
|
||
|
|
if (RD->getNumBases() > 1)
|
||
|
|
return true;
|
||
|
|
assert(RD->getNumBases() == 1);
|
||
|
|
const CXXRecordDecl *Base =
|
||
|
|
RD->bases_begin()->getType()->getAsCXXRecordDecl();
|
||
|
|
if (RD->isPolymorphic() && !Base->isPolymorphic())
|
||
|
|
return true;
|
||
|
|
RD = Base;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
MSInheritanceModel CXXRecordDecl::calculateInheritanceModel() const {
|
||
|
|
if (!hasDefinition() || isParsingBaseSpecifiers())
|
||
|
|
return MSInheritanceModel::Unspecified;
|
||
|
|
if (getNumVBases() > 0)
|
||
|
|
return MSInheritanceModel::Virtual;
|
||
|
|
if (usesMultipleInheritanceModel(this))
|
||
|
|
return MSInheritanceModel::Multiple;
|
||
|
|
return MSInheritanceModel::Single;
|
||
|
|
}
|
||
|
|
|
||
|
|
MSInheritanceModel CXXRecordDecl::getMSInheritanceModel() const {
|
||
|
|
MSInheritanceAttr *IA = getAttr<MSInheritanceAttr>();
|
||
|
|
assert(IA && "Expected MSInheritanceAttr on the CXXRecordDecl!");
|
||
|
|
return IA->getInheritanceModel();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool CXXRecordDecl::nullFieldOffsetIsZero() const {
|
||
|
|
return !inheritanceModelHasOnlyOneField(/*IsMemberFunction=*/false,
|
||
|
|
getMSInheritanceModel()) ||
|
||
|
|
(hasDefinition() && isPolymorphic());
|
||
|
|
}
|
||
|
|
|
||
|
|
MSVtorDispMode CXXRecordDecl::getMSVtorDispMode() const {
|
||
|
|
if (MSVtorDispAttr *VDA = getAttr<MSVtorDispAttr>())
|
||
|
|
return VDA->getVtorDispMode();
|
||
|
|
return getASTContext().getLangOpts().getVtorDispMode();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the number of pointer and integer slots used to represent a member
|
||
|
|
// pointer in the MS C++ ABI.
|
||
|
|
//
|
||
|
|
// Member function pointers have the following general form; however, fields
|
||
|
|
// are dropped as permitted (under the MSVC interpretation) by the inheritance
|
||
|
|
// model of the actual class.
|
||
|
|
//
|
||
|
|
// struct {
|
||
|
|
// // A pointer to the member function to call. If the member function is
|
||
|
|
// // virtual, this will be a thunk that forwards to the appropriate vftable
|
||
|
|
// // slot.
|
||
|
|
// void *FunctionPointerOrVirtualThunk;
|
||
|
|
//
|
||
|
|
// // An offset to add to the address of the vbtable pointer after
|
||
|
|
// // (possibly) selecting the virtual base but before resolving and calling
|
||
|
|
// // the function.
|
||
|
|
// // Only needed if the class has any virtual bases or bases at a non-zero
|
||
|
|
// // offset.
|
||
|
|
// int NonVirtualBaseAdjustment;
|
||
|
|
//
|
||
|
|
// // The offset of the vb-table pointer within the object. Only needed for
|
||
|
|
// // incomplete types.
|
||
|
|
// int VBPtrOffset;
|
||
|
|
//
|
||
|
|
// // An offset within the vb-table that selects the virtual base containing
|
||
|
|
// // the member. Loading from this offset produces a new offset that is
|
||
|
|
// // added to the address of the vb-table pointer to produce the base.
|
||
|
|
// int VirtualBaseAdjustmentOffset;
|
||
|
|
// };
|
||
|
|
static std::pair<unsigned, unsigned>
|
||
|
|
getMSMemberPointerSlots(const MemberPointerType *MPT) {
|
||
|
|
const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
|
||
|
|
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
|
||
|
|
unsigned Ptrs = 0;
|
||
|
|
unsigned Ints = 0;
|
||
|
|
if (MPT->isMemberFunctionPointer())
|
||
|
|
Ptrs = 1;
|
||
|
|
else
|
||
|
|
Ints = 1;
|
||
|
|
if (inheritanceModelHasNVOffsetField(MPT->isMemberFunctionPointer(),
|
||
|
|
Inheritance))
|
||
|
|
Ints++;
|
||
|
|
if (inheritanceModelHasVBPtrOffsetField(Inheritance))
|
||
|
|
Ints++;
|
||
|
|
if (inheritanceModelHasVBTableOffsetField(Inheritance))
|
||
|
|
Ints++;
|
||
|
|
return std::make_pair(Ptrs, Ints);
|
||
|
|
}
|
||
|
|
|
||
|
|
CXXABI::MemberPointerInfo MicrosoftCXXABI::getMemberPointerInfo(
|
||
|
|
const MemberPointerType *MPT) const {
|
||
|
|
// The nominal struct is laid out with pointers followed by ints and aligned
|
||
|
|
// to a pointer width if any are present and an int width otherwise.
|
||
|
|
const TargetInfo &Target = Context.getTargetInfo();
|
||
|
|
unsigned PtrSize = Target.getPointerWidth(0);
|
||
|
|
unsigned IntSize = Target.getIntWidth();
|
||
|
|
|
||
|
|
unsigned Ptrs, Ints;
|
||
|
|
std::tie(Ptrs, Ints) = getMSMemberPointerSlots(MPT);
|
||
|
|
MemberPointerInfo MPI;
|
||
|
|
MPI.HasPadding = false;
|
||
|
|
MPI.Width = Ptrs * PtrSize + Ints * IntSize;
|
||
|
|
|
||
|
|
// When MSVC does x86_32 record layout, it aligns aggregate member pointers to
|
||
|
|
// 8 bytes. However, __alignof usually returns 4 for data memptrs and 8 for
|
||
|
|
// function memptrs.
|
||
|
|
if (Ptrs + Ints > 1 && Target.getTriple().isArch32Bit())
|
||
|
|
MPI.Align = 64;
|
||
|
|
else if (Ptrs)
|
||
|
|
MPI.Align = Target.getPointerAlign(0);
|
||
|
|
else
|
||
|
|
MPI.Align = Target.getIntAlign();
|
||
|
|
|
||
|
|
if (Target.getTriple().isArch64Bit()) {
|
||
|
|
MPI.Width = llvm::alignTo(MPI.Width, MPI.Align);
|
||
|
|
MPI.HasPadding = MPI.Width != (Ptrs * PtrSize + Ints * IntSize);
|
||
|
|
}
|
||
|
|
return MPI;
|
||
|
|
}
|
||
|
|
|
||
|
|
CXXABI *clang::CreateMicrosoftCXXABI(ASTContext &Ctx) {
|
||
|
|
return new MicrosoftCXXABI(Ctx);
|
||
|
|
}
|