| 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 |