1//===--- DeclAccessPair.h - A decl bundled with its path access -*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file defines the DeclAccessPair class, which provides an 10// efficient representation of a pair of a NamedDecl* and an 11// AccessSpecifier. Generally the access specifier gives the 12// natural access of a declaration when named in a class, as 13// defined in C++ [class.access.base]p1. 14// 15//===----------------------------------------------------------------------===// 16 17#ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H 18#define LLVM_CLANG_AST_DECLACCESSPAIR_H 19 20#include "clang/Basic/Specifiers.h" 21#include "llvm/Support/DataTypes.h" 22 23namespace clang { 24 25class NamedDecl; 26 27/// A POD class for pairing a NamedDecl* with an access specifier. 28/// Can be put into unions. 29class DeclAccessPair { 30 uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial 31 32 enum { Mask = 0x3 }; 33 34public: 35 static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) { 36 DeclAccessPair p; 37 p.set(D, AS); 38 return p; 39 } 40 41 NamedDecl *getDecl() const { 42 return reinterpret_cast<NamedDecl*>(~Mask & Ptr); 43 } 44 AccessSpecifier getAccess() const { 45 return AccessSpecifier(Mask & Ptr); 46 } 47 48 void setDecl(NamedDecl *D) { 49 set(D, getAccess()); 50 } 51 void setAccess(AccessSpecifier AS) { 52 set(getDecl(), AS); 53 } 54 void set(NamedDecl *D, AccessSpecifier AS) { 55 Ptr = uintptr_t(AS) | reinterpret_cast<uintptr_t>(D); 56 } 57 58 operator NamedDecl*() const { return getDecl(); } 59 NamedDecl *operator->() const { return getDecl(); } 60}; 61} 62 63#endif 64