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      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 
     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   uintptr_t 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 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