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 23 namespace clang { 24 25 class NamedDecl; 26 27 /// A POD class for pairing a NamedDecl* with an access specifier. 28 /// Can be put into unions. 29 class DeclAccessPair { 30 NamedDecl *Ptr; // we'd use llvm::PointerUnion, but it isn't trivial 31 32 enum { Mask = 0x3 }; 33 34 public: 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. 65 namespace llvm { 66 template<typename> struct isPodLike; 67 template<> struct isPodLike<clang::DeclAccessPair> { 68 static const bool value = true; 69 }; 70 } 71 72 #endif 73
