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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/mobile
 Path: blob/master/src/hotspot/share/gc/shenandoah/shenandoahForwarding.hpp
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/*

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 * Copyright (c) 2013, 2019, Red Hat, Inc. All rights reserved.

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

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 *

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

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

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 * published by the Free Software Foundation.

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 *

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

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

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

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

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 * accompanied this code).

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 *

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

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

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

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 *

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

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

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 * questions.

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 *

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 */

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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP

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#define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP

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#include "oops/oop.hpp"

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#include "utilities/globalDefinitions.hpp"

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class ShenandoahForwarding {

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public:

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  /* Gets forwardee from the given object.

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   */

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  static inline oop get_forwardee(oop obj);

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  /* Gets forwardee from the given object. Only from mutator thread.

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   */

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  static inline oop get_forwardee_mutator(oop obj);

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  /* Returns the raw value from forwardee slot.

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   */

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  static inline oop get_forwardee_raw(oop obj);

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  /* Returns the raw value from forwardee slot without any checks.

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   * Used for quick verification.

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   */

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  static inline oop get_forwardee_raw_unchecked(oop obj);

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  /**

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   * Returns true if the object is forwarded, false otherwise.

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   */

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  static inline bool is_forwarded(oop obj);

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  /* Tries to atomically update forwardee in $holder object to $update.

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   * Assumes $holder points at itself.

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   * Asserts $holder is in from-space.

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   * Asserts $update is in to-space.

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   *

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   * Returns the new object 'update' upon success, or

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   * the new forwardee that a competing thread installed.

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   */

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  static inline oop try_update_forwardee(oop obj, oop update);

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};

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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP

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