/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_OOPS_OOPHANDLE_HPP

#define SHARE_VM_OOPS_OOPHANDLE_HPP

#include "oops/oop.hpp"

#include "runtime/atomic.hpp"

#include "runtime/orderAccess.hpp"

// Simple class for encapsulating oop pointers stored in metadata.

// These are different from Handle.  The Handle class stores pointers

// to oops on the stack, and manages the allocation from a thread local

// area in the constructor.

// This assumes that the caller will allocate the handle in the appropriate

// area.  The reason for the encapsulation is to help with naming and to allow

// future uses for read barriers.

class OopHandle {

private:

  oop* _obj;

public:

  OopHandle() : _obj(NULL) {}

  OopHandle(oop* w) : _obj(w) {}

  oop resolve() const { return (_obj == NULL) ? (oop)NULL : *_obj; }

};

#endif // SHARE_VM_OOPS_OOPHANDLE_HPP