/*

 * Copyright (c) 2018, 2019, 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

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 */

#ifndef SHARE_GC_SHARED_PARALLELCLEANING_HPP

#define SHARE_GC_SHARED_PARALLELCLEANING_HPP

#include "classfile/classLoaderDataGraph.hpp"

#include "code/codeCache.hpp"

#include "gc/shared/oopStorageParState.hpp"

#include "gc/shared/stringdedup/stringDedup.hpp"

#include "gc/shared/workgroup.hpp"

class ParallelCleaningTask;

class StringDedupCleaningTask : public AbstractGangTask {

  StringDedupUnlinkOrOopsDoClosure _dedup_closure;

public:

  StringDedupCleaningTask(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool resize_table);

  ~StringDedupCleaningTask();

  void work(uint worker_id);

};

class CodeCacheUnloadingTask {

  CodeCache::UnloadingScope _unloading_scope;

  const bool                _unloading_occurred;

  const uint                _num_workers;

  // Variables used to claim nmethods.

  CompiledMethod* _first_nmethod;

  CompiledMethod* volatile _claimed_nmethod;

public:

  CodeCacheUnloadingTask(uint num_workers, BoolObjectClosure* is_alive, bool unloading_occurred);

  ~CodeCacheUnloadingTask();

private:

  static const int MaxClaimNmethods = 16;

  void claim_nmethods(CompiledMethod** claimed_nmethods, int *num_claimed_nmethods);

public:

  // Cleaning and unloading of nmethods.

  void work(uint worker_id);

};

class KlassCleaningTask : public StackObj {

  volatile int                            _clean_klass_tree_claimed;

  ClassLoaderDataGraphKlassIteratorAtomic _klass_iterator;

public:

  KlassCleaningTask();

private:

  bool claim_clean_klass_tree_task();

  InstanceKlass* claim_next_klass();

public:

  void clean_klass(InstanceKlass* ik) {

    ik->clean_weak_instanceklass_links();

  }

  void work();

};

// Do cleanup of some weakly held data in the same parallel task.

// Assumes a non-moving context.

class ParallelCleaningTask : public AbstractGangTask {

private:

  bool                    _unloading_occurred;

  StringDedupCleaningTask _string_dedup_task;

  CodeCacheUnloadingTask  _code_cache_task;

  KlassCleaningTask       _klass_cleaning_task;

public:

  // The constructor is run in the VMThread.

  ParallelCleaningTask(BoolObjectClosure* is_alive,

                       uint num_workers,

                       bool unloading_occurred,

                       bool resize_dedup_table);

  void work(uint worker_id);

};

#endif // SHARE_GC_SHARED_PARALLELCLEANING_HPP