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
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 uintptr_t 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 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