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//===--- Entity.h - Cross-translation-unit "token" for decls ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Entity is a ASTContext-independent way to refer to declarations that are
// visible across translation units.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_INDEX_ENTITY_H
#define LLVM_CLANG_INDEX_ENTITY_H
#include "llvm/ADT/FoldingSet.h"
namespace clang {
class ASTContext;
class Decl;
namespace idx {
class Program;
/// \brief A ASTContext-independent way to refer to declarations that are
/// visible across translation units.
///
/// Entity is basically the link for declarations that are semantically the same
/// in multiple ASTContexts. A client will convert a Decl into an Entity and
/// later use that Entity to find the "same" Decl into another ASTContext.
///
/// An Entity may only refer to declarations that can be visible by multiple
/// translation units, e.g. a static function cannot have an Entity associated
/// with it.
///
/// Entities are uniqued so pointer equality can be used (note that the same
/// Program object should be used when getting Entities).
///
class Entity : public llvm::FoldingSetNode {
public:
/// \brief Find the Decl that can be referred to by this entity.
Decl *getDecl(ASTContext &AST);
/// \brief Get the Decl's name.
const char *getName(ASTContext &Ctx);
/// \brief Get an Entity associated with the given Decl.
/// \returns Null if an Entity cannot refer to this Decl.
static Entity *get(Decl *D, Program &Prog);
void Profile(llvm::FoldingSetNodeID &ID) const {
Profile(ID, Parent, Id);
}
static void Profile(llvm::FoldingSetNodeID &ID, Entity *Parent, void *Id) {
ID.AddPointer(Parent);
ID.AddPointer(Id);
}
private:
Entity *Parent;
void *Id;
Entity(Entity *parent, void *id) : Parent(parent), Id(id) { }
friend class EntityGetter;
};
} // namespace idx
} // namespace clang
#endif
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