1 /*
2  * Copyright (c) 2017, 2019, 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_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP
25 #define SHARE_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP
26 
27 #include "gc/shared/stringdedup/stringDedup.hpp"
28 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
29 #include "memory/iterator.hpp"
30 
31 class ShenandoahStringDedup : public StringDedup {
32 public:
33   // Initialize string deduplication.
34   static void initialize();
35 
36   // Enqueue a string to worker's local string dedup queue
37   static void enqueue_candidate(oop java_string);
38 
39   // Deduplicate a string, the call is lock-free
40   static void deduplicate(oop java_string);
41 
42   static void parallel_oops_do(ShenandoahPhaseTimings::Phase phase,
43                                BoolObjectClosure* is_alive,
44                                OopClosure* cl,
45                                uint worker_id);
46 
47   static void oops_do_slow(OopClosure* cl);
48 
49   static inline bool is_candidate(oop obj);
50 
51   static void unlink_or_oops_do(BoolObjectClosure* is_alive,
52                                 OopClosure* keep_alive,
53                                 bool allow_resize_and_rehash);
54 
55 };
56 
57 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP
58