1251876Speter//===--- DeclAccessPair.h - A decl bundled with its path access -*- C++ -*-===// 2251876Speter// 3253734Speter// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4251876Speter// See https://llvm.org/LICENSE.txt for license information. 5251876Speter// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6253734Speter// 7251876Speter//===----------------------------------------------------------------------===// 8251876Speter// 9251876Speter// This file defines the DeclAccessPair class, which provides an 10251876Speter// efficient representation of a pair of a NamedDecl* and an 11251876Speter// AccessSpecifier. Generally the access specifier gives the 12251876Speter// natural access of a declaration when named in a class, as 13251876Speter// defined in C++ [class.access.base]p1. 14251876Speter// 15251876Speter//===----------------------------------------------------------------------===// 16251876Speter 17251876Speter#ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H 18251876Speter#define LLVM_CLANG_AST_DECLACCESSPAIR_H 19251876Speter 20251876Speter#include "clang/Basic/Specifiers.h" 21251876Speter#include "llvm/Support/DataTypes.h" 22251876Speter 23251876Speternamespace clang { 24251876Speter 25251876Speterclass NamedDecl; 26251876Speter 27251876Speter/// A POD class for pairing a NamedDecl* with an access specifier. 28251876Speter/// Can be put into unions. 29251876Speterclass DeclAccessPair { 30251876Speter uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial 31251876Speter 32251876Speter enum { Mask = 0x3 }; 33251876Speter 34251876Speterpublic: 35251876Speter static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) { 36251876Speter DeclAccessPair p; 37251876Speter p.set(D, AS); 38251876Speter return p; 39251876Speter } 40251876Speter 41251876Speter NamedDecl *getDecl() const { 42251876Speter return reinterpret_cast<NamedDecl*>(~Mask & Ptr); 43251876Speter } 44251876Speter AccessSpecifier getAccess() const { 45251876Speter return AccessSpecifier(Mask & Ptr); 46251876Speter } 47251876Speter 48251876Speter void setDecl(NamedDecl *D) { 49251876Speter set(D, getAccess()); 50251876Speter } 51251876Speter void setAccess(AccessSpecifier AS) { 52251876Speter set(getDecl(), AS); 53251876Speter } 54251876Speter void set(NamedDecl *D, AccessSpecifier AS) { 55251876Speter Ptr = uintptr_t(AS) | reinterpret_cast<uintptr_t>(D); 56251876Speter } 57251876Speter 58251876Speter operator NamedDecl*() const { return getDecl(); } 59251876Speter NamedDecl *operator->() const { return getDecl(); } 60251876Speter}; 61251876Speter} 62251876Speter 63251876Speter#endif 64251876Speter