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, AS: getAccess()); |
50 | } |
51 | void setAccess(AccessSpecifier AS) { |
52 | set(D: 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 | |