/*
 * Copyright Amazon.com Inc. 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.
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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHSTACKCHUNKGCDATA_HPP
#define SHARE_GC_SHENANDOAH_SHENANDOAHSTACKCHUNKGCDATA_HPP

#include "oops/oopsHierarchy.hpp"
#include "runtime/atomic.hpp"

class ShenandoahStackChunkGCData {
private:
  // Monotonically increasing epoch counter.
  // Must not wrap to track the epoch accurately.
  static Atomic<int64_t> _epoch_id_counter;

  // The GC epoch when chunk was allocated.
  int64_t _epoch;

  static ShenandoahStackChunkGCData* data(stackChunkOop chunk);

public:
  static void change_epoch_id();

  static void initialize(stackChunkOop chunk);
  static bool is_different_epoch(stackChunkOop chunk);
};

#endif // SHARE_GC_SHENANDOAH_SHENANDOAHSTACKCHUNKGCDATA_HPP