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//===- BaseSubobject.h - BaseSubobject class --------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file provides a definition of the BaseSubobject class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_BASESUBOBJECT_H
#define LLVM_CLANG_AST_BASESUBOBJECT_H
#include "clang/AST/CharUnits.h"
#include "clang/AST/DeclCXX.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/Support/type_traits.h"
#include <cstdint>
#include <utility>
namespace clang {
class CXXRecordDecl;
// BaseSubobject - Uniquely identifies a direct or indirect base class.
// Stores both the base class decl and the offset from the most derived class to
// the base class. Used for vtable and VTT generation.
class BaseSubobject {
/// Base - The base class declaration.
const CXXRecordDecl *Base;
/// BaseOffset - The offset from the most derived class to the base class.
CharUnits BaseOffset;
public:
BaseSubobject() = default;
BaseSubobject(const CXXRecordDecl *Base, CharUnits BaseOffset)
: Base(Base), BaseOffset(BaseOffset) {}
/// getBase - Returns the base class declaration.
const CXXRecordDecl *getBase() const { return Base; }
/// getBaseOffset - Returns the base class offset.
CharUnits getBaseOffset() const { return BaseOffset; }
friend bool operator==(const BaseSubobject &LHS, const BaseSubobject &RHS) {
return LHS.Base == RHS.Base && LHS.BaseOffset == RHS.BaseOffset;
}
};
} // namespace clang
namespace llvm {
template<> struct DenseMapInfo<clang::BaseSubobject> {
static clang::BaseSubobject getEmptyKey() {
return clang::BaseSubobject(
DenseMapInfo<const clang::CXXRecordDecl *>::getEmptyKey(),
clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getEmptyKey()));
}
static clang::BaseSubobject getTombstoneKey() {
return clang::BaseSubobject(
DenseMapInfo<const clang::CXXRecordDecl *>::getTombstoneKey(),
clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getTombstoneKey()));
}
static unsigned getHashValue(const clang::BaseSubobject &Base) {
using PairTy = std::pair<const clang::CXXRecordDecl *, clang::CharUnits>;
return DenseMapInfo<PairTy>::getHashValue(PairTy(Base.getBase(),
Base.getBaseOffset()));
}
static bool isEqual(const clang::BaseSubobject &LHS,
const clang::BaseSubobject &RHS) {
return LHS == RHS;
}
};
} // namespace llvm
#endif // LLVM_CLANG_AST_BASESUBOBJECT_H
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