68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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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 HeapWord* 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 HeapWord* 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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