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