73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
//===--- DeclAccessPair.h - A decl bundled with its path access -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the DeclAccessPair class, which provides an
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// efficient representation of a pair of a NamedDecl* and an
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// AccessSpecifier. Generally the access specifier gives the
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// natural access of a declaration when named in a class, as
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// defined in C++ [class.access.base]p1.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H
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#define LLVM_CLANG_AST_DECLACCESSPAIR_H
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#include "clang/Basic/Specifiers.h"
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namespace clang {
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class NamedDecl;
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/// A POD class for pairing a NamedDecl* with an access specifier.
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/// Can be put into unions.
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class DeclAccessPair {
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NamedDecl *Ptr; // we'd use llvm::PointerUnion, but it isn't trivial
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enum { Mask = 0x3 };
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public:
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static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) {
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DeclAccessPair p;
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p.set(D, AS);
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return p;
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}
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NamedDecl *getDecl() const {
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return (NamedDecl*) (~Mask & (uintptr_t) Ptr);
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}
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AccessSpecifier getAccess() const {
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return AccessSpecifier(Mask & (uintptr_t) Ptr);
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}
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void setDecl(NamedDecl *D) {
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set(D, getAccess());
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}
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void setAccess(AccessSpecifier AS) {
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set(getDecl(), AS);
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}
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void set(NamedDecl *D, AccessSpecifier AS) {
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Ptr = reinterpret_cast<NamedDecl*>(uintptr_t(AS) |
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reinterpret_cast<uintptr_t>(D));
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}
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operator NamedDecl*() const { return getDecl(); }
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NamedDecl *operator->() const { return getDecl(); }
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};
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}
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// Take a moment to tell SmallVector that DeclAccessPair is POD.
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namespace llvm {
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template<typename> struct isPodLike;
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template<> struct isPodLike<clang::DeclAccessPair> {
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static const bool value = true;
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};
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}
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#endif
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