1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP
  26 
  27 #include "gc/shared/stringdedup/stringDedup.hpp"
  28 #include "memory/iterator.hpp"
  29 
  30 class ShenandoahStringDedup : public StringDedup {
  31 public:
  32   // Initialize string deduplication.
  33   static void initialize();
  34 
  35   // Enqueue a string to worker's local string dedup queue
  36   static void enqueue_candidate(oop java_string);
  37 
  38   // Deduplicate a string, the call is lock-free
  39   static void deduplicate(oop java_string);
  40 
  41   static void parallel_oops_do(BoolObjectClosure* is_alive, OopClosure* cl, uint worker_id);
  42   static void oops_do_slow(OopClosure* cl);
  43 
  44   // Parallel cleanup string dedup queues/table
  45   static void parallel_cleanup();
  46 
  47   static inline bool is_candidate(oop obj);
  48 
  49   static void unlink_or_oops_do(BoolObjectClosure* is_alive,
  50                                 OopClosure* keep_alive,
  51                                 bool allow_resize_and_rehash);
  52 
  53 };
  54 
  55 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP