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
24namespace clang {
25
26class NamedDecl;
27
28/// A POD class for pairing a NamedDecl* with an access specifier.
29/// Can be put into unions.
30class DeclAccessPair {
31 uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial
32
33 enum { Mask = 0x3 };
34
35public:
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.
65namespace llvm {
66template<typename> struct isPodLike;
67template<> struct isPodLike<clang::DeclAccessPair> {
68 static const bool value = true;
69};
70}
71
72#endif
73