/*

 * Copyright (c) 2017, 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.

 *

 */

#include "classfile/javaClasses.inline.hpp"

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

#include "memory/iterator.hpp"

class ShenandoahStringDedup : public StringDedup {

public:

  // Initialize string deduplication.

  static void initialize();

  // Enqueue a string to worker's local string dedup queue

  static void enqueue_candidate(oop java_string);

  // Deduplicate a string, the call is lock-free

  static void deduplicate(oop java_string);

  static void parallel_oops_do(OopClosure* cl, uint worker_id);

  static void oops_do_slow(OopClosure* cl);

  // Parallel cleanup string dedup queues/table

  static void parallel_cleanup();

  static inline bool is_candidate(oop obj) {

    return java_lang_String::is_instance_inlined(obj) &&

           java_lang_String::value(obj) != NULL;

  }

private:

  static void unlink_or_oops_do(BoolObjectClosure* is_alive,

                                OopClosure* keep_alive,

                                bool allow_resize_and_rehash);

};