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 #include "llvm/Support/DataTypes.h" 23 24 namespace clang { 25 26 class NamedDecl; 27 28 /// A POD class for pairing a NamedDecl* with an access specifier. 29 /// Can be put into unions. 30 class DeclAccessPair { 31 uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial 32 33 enum { Mask = 0x3 }; 34 35 public: 36 static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) { 37 DeclAccessPair p; 38 p.set(D, AS); 39 return p; 40 } 41 42 NamedDecl *getDecl() const { 43 return reinterpret_cast<NamedDecl*>(~Mask & Ptr); 44 } 45 AccessSpecifier getAccess() const { 46 return AccessSpecifier(Mask & Ptr); 47 } 48 49 void setDecl(NamedDecl *D) { 50 set(D, getAccess()); 51 } 52 void setAccess(AccessSpecifier AS) { 53 set(getDecl(), AS); 54 } 55 void set(NamedDecl *D, AccessSpecifier AS) { 56 Ptr = uintptr_t(AS) | 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
