1//===--- DeclAccessPair.h - A decl bundled with its path access -*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the DeclAccessPair class, which provides an 11// efficient representation of a pair of a NamedDecl* and an 12// AccessSpecifier. Generally the access specifier gives the 13// natural access of a declaration when named in a class, as 14// defined in C++ [class.access.base]p1. 15// 16//===----------------------------------------------------------------------===// 17 18#ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H 19#define LLVM_CLANG_AST_DECLACCESSPAIR_H 20 21#include "clang/Basic/Specifiers.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 NamedDecl *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 (NamedDecl*) (~Mask & (uintptr_t) Ptr); 43 } 44 AccessSpecifier getAccess() const { 45 return AccessSpecifier(Mask & (uintptr_t) 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 = reinterpret_cast<NamedDecl*>(uintptr_t(AS) | 56 reinterpret_cast<uintptr_t>(D)); 57 } 58 59 operator NamedDecl*() const { return getDecl(); } 60 NamedDecl *operator->() const { return getDecl(); } 61}; 62} 63 64// Take a moment to tell SmallVector that DeclAccessPair is POD. 65namespace llvm { 66template<typename> struct isPodLike; 67template<> struct isPodLike<clang::DeclAccessPair> { 68 static const bool value = true; 69}; 70} 71 72#endif 73