/*

 * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP

#define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP

#include "gc/shenandoah/shenandoahAsserts.hpp"

#include "gc/shenandoah/shenandoahForwarding.hpp"

#include "oops/markWord.inline.hpp"

#include "runtime/atomic.hpp"

inline HeapWord* ShenandoahForwarding::get_forwardee_raw(oop obj) {

  shenandoah_assert_in_heap(NULL, obj);

  return get_forwardee_raw_unchecked(obj);

}

inline HeapWord* ShenandoahForwarding::get_forwardee_raw_unchecked(oop obj) {

  markWord mark = obj->mark_raw();

  if (mark.is_marked()) {

    return (HeapWord*) mark.clear_lock_bits().to_pointer();

  } else {

    return (HeapWord*) obj;

  }

}

inline oop ShenandoahForwarding::get_forwardee(oop obj) {

  shenandoah_assert_correct(NULL, obj);

  return oop(get_forwardee_raw_unchecked(obj));

}

inline bool ShenandoahForwarding::is_forwarded(oop obj) {

  return obj->mark_raw().is_marked();

}

inline oop ShenandoahForwarding::try_update_forwardee(oop obj, oop update) {

  markWord old_mark = obj->mark_raw();

  if (old_mark.is_marked()) {

    return oop(old_mark.clear_lock_bits().to_pointer());

  }

  markWord new_mark = markWord::encode_pointer_as_mark(update);

  markWord prev_mark = obj->cas_set_mark_raw(new_mark, old_mark);

  if (prev_mark == old_mark) {

    return update;

  } else {

    return oop(prev_mark.clear_lock_bits().to_pointer());

  }

}

#endif // SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP