1207619Srdivacky//===--- DeclAccessPair.h - A decl bundled with its path access -*- C++ -*-===// 2207619Srdivacky// 3207619Srdivacky// The LLVM Compiler Infrastructure 4207619Srdivacky// 5207619Srdivacky// This file is distributed under the University of Illinois Open Source 6207619Srdivacky// License. See LICENSE.TXT for details. 7207619Srdivacky// 8207619Srdivacky//===----------------------------------------------------------------------===// 9207619Srdivacky// 10207619Srdivacky// This file defines the DeclAccessPair class, which provides an 11207619Srdivacky// efficient representation of a pair of a NamedDecl* and an 12207619Srdivacky// AccessSpecifier. Generally the access specifier gives the 13207619Srdivacky// natural access of a declaration when named in a class, as 14207619Srdivacky// defined in C++ [class.access.base]p1. 15207619Srdivacky// 16207619Srdivacky//===----------------------------------------------------------------------===// 17207619Srdivacky 18207619Srdivacky#ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H 19207619Srdivacky#define LLVM_CLANG_AST_DECLACCESSPAIR_H 20207619Srdivacky 21207619Srdivacky#include "clang/Basic/Specifiers.h" 22252723Sdim#include "llvm/Support/DataTypes.h" 23207619Srdivacky 24207619Srdivackynamespace clang { 25207619Srdivacky 26207619Srdivackyclass NamedDecl; 27207619Srdivacky 28207619Srdivacky/// A POD class for pairing a NamedDecl* with an access specifier. 29207619Srdivacky/// Can be put into unions. 30207619Srdivackyclass DeclAccessPair { 31263509Sdim uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial 32207619Srdivacky 33207619Srdivacky enum { Mask = 0x3 }; 34207619Srdivacky 35207619Srdivackypublic: 36207619Srdivacky static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) { 37207619Srdivacky DeclAccessPair p; 38207619Srdivacky p.set(D, AS); 39207619Srdivacky return p; 40207619Srdivacky } 41207619Srdivacky 42207619Srdivacky NamedDecl *getDecl() const { 43263509Sdim return reinterpret_cast<NamedDecl*>(~Mask & Ptr); 44207619Srdivacky } 45207619Srdivacky AccessSpecifier getAccess() const { 46263509Sdim return AccessSpecifier(Mask & Ptr); 47207619Srdivacky } 48207619Srdivacky 49207619Srdivacky void setDecl(NamedDecl *D) { 50207619Srdivacky set(D, getAccess()); 51207619Srdivacky } 52207619Srdivacky void setAccess(AccessSpecifier AS) { 53207619Srdivacky set(getDecl(), AS); 54207619Srdivacky } 55207619Srdivacky void set(NamedDecl *D, AccessSpecifier AS) { 56263509Sdim Ptr = uintptr_t(AS) | reinterpret_cast<uintptr_t>(D); 57207619Srdivacky } 58207619Srdivacky 59207619Srdivacky operator NamedDecl*() const { return getDecl(); } 60207619Srdivacky NamedDecl *operator->() const { return getDecl(); } 61207619Srdivacky}; 62207619Srdivacky} 63207619Srdivacky 64207619Srdivacky// Take a moment to tell SmallVector that DeclAccessPair is POD. 65207619Srdivackynamespace llvm { 66207619Srdivackytemplate<typename> struct isPodLike; 67207619Srdivackytemplate<> struct isPodLike<clang::DeclAccessPair> { 68207619Srdivacky static const bool value = true; 69207619Srdivacky}; 70207619Srdivacky} 71207619Srdivacky 72207619Srdivacky#endif 73