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//===----- Thunk.h - Declarations related to VTable Thunks ------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Enums/classes describing THUNK related information about constructors,
/// destructors and thunks.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_BASIC_THUNK_H
#define LLVM_CLANG_BASIC_THUNK_H
#include <cstdint>
#include <cstring>
namespace clang {
class CXXMethodDecl;
/// A return adjustment.
struct ReturnAdjustment {
/// The non-virtual adjustment from the derived object to its
/// nearest virtual base.
int64_t NonVirtual = 0;
/// Holds the ABI-specific information about the virtual return
/// adjustment, if needed.
union VirtualAdjustment {
// Itanium ABI
struct {
/// The offset (in bytes), relative to the address point
/// of the virtual base class offset.
int64_t VBaseOffsetOffset;
} Itanium;
// Microsoft ABI
struct {
/// The offset (in bytes) of the vbptr, relative to the beginning
/// of the derived class.
uint32_t VBPtrOffset;
/// Index of the virtual base in the vbtable.
uint32_t VBIndex;
} Microsoft;
VirtualAdjustment() { memset(this, 0, sizeof(*this)); }
bool Equals(const VirtualAdjustment &Other) const {
return memcmp(this, &Other, sizeof(Other)) == 0;
}
bool isEmpty() const {
VirtualAdjustment Zero;
return Equals(Zero);
}
bool Less(const VirtualAdjustment &RHS) const {
return memcmp(this, &RHS, sizeof(RHS)) < 0;
}
} Virtual;
ReturnAdjustment() = default;
bool isEmpty() const { return !NonVirtual && Virtual.isEmpty(); }
friend bool operator==(const ReturnAdjustment &LHS,
const ReturnAdjustment &RHS) {
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Equals(RHS.Virtual);
}
friend bool operator!=(const ReturnAdjustment &LHS,
const ReturnAdjustment &RHS) {
return !(LHS == RHS);
}
friend bool operator<(const ReturnAdjustment &LHS,
const ReturnAdjustment &RHS) {
if (LHS.NonVirtual < RHS.NonVirtual)
return true;
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Less(RHS.Virtual);
}
};
/// A \c this pointer adjustment.
struct ThisAdjustment {
/// The non-virtual adjustment from the derived object to its
/// nearest virtual base.
int64_t NonVirtual = 0;
/// Holds the ABI-specific information about the virtual this
/// adjustment, if needed.
union VirtualAdjustment {
// Itanium ABI
struct {
/// The offset (in bytes), relative to the address point,
/// of the virtual call offset.
int64_t VCallOffsetOffset;
} Itanium;
struct {
/// The offset of the vtordisp (in bytes), relative to the ECX.
int32_t VtordispOffset;
/// The offset of the vbptr of the derived class (in bytes),
/// relative to the ECX after vtordisp adjustment.
int32_t VBPtrOffset;
/// The offset (in bytes) of the vbase offset in the vbtable.
int32_t VBOffsetOffset;
} Microsoft;
VirtualAdjustment() { memset(this, 0, sizeof(*this)); }
bool Equals(const VirtualAdjustment &Other) const {
return memcmp(this, &Other, sizeof(Other)) == 0;
}
bool isEmpty() const {
VirtualAdjustment Zero;
return Equals(Zero);
}
bool Less(const VirtualAdjustment &RHS) const {
return memcmp(this, &RHS, sizeof(RHS)) < 0;
}
} Virtual;
ThisAdjustment() = default;
bool isEmpty() const { return !NonVirtual && Virtual.isEmpty(); }
friend bool operator==(const ThisAdjustment &LHS, const ThisAdjustment &RHS) {
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Equals(RHS.Virtual);
}
friend bool operator!=(const ThisAdjustment &LHS, const ThisAdjustment &RHS) {
return !(LHS == RHS);
}
friend bool operator<(const ThisAdjustment &LHS, const ThisAdjustment &RHS) {
if (LHS.NonVirtual < RHS.NonVirtual)
return true;
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Less(RHS.Virtual);
}
};
/// The \c this pointer adjustment as well as an optional return
/// adjustment for a thunk.
struct ThunkInfo {
/// The \c this pointer adjustment.
ThisAdjustment This;
/// The return adjustment.
ReturnAdjustment Return;
/// Holds a pointer to the overridden method this thunk is for,
/// if needed by the ABI to distinguish different thunks with equal
/// adjustments. Otherwise, null.
/// CAUTION: In the unlikely event you need to sort ThunkInfos, consider using
/// an ABI-specific comparator.
const CXXMethodDecl *Method;
ThunkInfo() : Method(nullptr) {}
ThunkInfo(const ThisAdjustment &This, const ReturnAdjustment &Return,
const CXXMethodDecl *Method = nullptr)
: This(This), Return(Return), Method(Method) {}
friend bool operator==(const ThunkInfo &LHS, const ThunkInfo &RHS) {
return LHS.This == RHS.This && LHS.Return == RHS.Return &&
LHS.Method == RHS.Method;
}
bool isEmpty() const {
return This.isEmpty() && Return.isEmpty() && Method == nullptr;
}
};
} // end namespace clang
#endif
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