87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
//===--- BaseSubobject.h - BaseSubobject class ----------------------------===//
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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 file provides a definition of the BaseSubobject class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_BASESUBOBJECT_H
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#define LLVM_CLANG_AST_BASESUBOBJECT_H
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#include "clang/AST/CharUnits.h"
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#include "clang/AST/DeclCXX.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/type_traits.h"
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namespace clang {
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// BaseSubobject - Uniquely identifies a direct or indirect base class.
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// Stores both the base class decl and the offset from the most derived class to
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// the base class. Used for vtable and VTT generation.
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class BaseSubobject {
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/// Base - The base class declaration.
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const CXXRecordDecl *Base;
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/// BaseOffset - The offset from the most derived class to the base class.
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CharUnits BaseOffset;
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public:
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BaseSubobject() { }
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BaseSubobject(const CXXRecordDecl *Base, CharUnits BaseOffset)
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: Base(Base), BaseOffset(BaseOffset) { }
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/// getBase - Returns the base class declaration.
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const CXXRecordDecl *getBase() const { return Base; }
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/// getBaseOffset - Returns the base class offset.
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CharUnits getBaseOffset() const { return BaseOffset; }
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friend bool operator==(const BaseSubobject &LHS, const BaseSubobject &RHS) {
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return LHS.Base == RHS.Base && LHS.BaseOffset == RHS.BaseOffset;
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}
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};
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} // end namespace clang
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namespace llvm {
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template<> struct DenseMapInfo<clang::BaseSubobject> {
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static clang::BaseSubobject getEmptyKey() {
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return clang::BaseSubobject(
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DenseMapInfo<const clang::CXXRecordDecl *>::getEmptyKey(),
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clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getEmptyKey()));
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}
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static clang::BaseSubobject getTombstoneKey() {
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return clang::BaseSubobject(
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DenseMapInfo<const clang::CXXRecordDecl *>::getTombstoneKey(),
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clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getTombstoneKey()));
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}
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static unsigned getHashValue(const clang::BaseSubobject &Base) {
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typedef std::pair<const clang::CXXRecordDecl *, clang::CharUnits> PairTy;
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return DenseMapInfo<PairTy>::getHashValue(PairTy(Base.getBase(),
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Base.getBaseOffset()));
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}
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static bool isEqual(const clang::BaseSubobject &LHS,
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const clang::BaseSubobject &RHS) {
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return LHS == RHS;
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}
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};
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// It's OK to treat BaseSubobject as a POD type.
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template <> struct isPodLike<clang::BaseSubobject> {
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static const bool value = true;
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};
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}
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#endif
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