1/*
2 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24#ifndef SHARE_GC_Z_ZREFERENCEPROCESSOR_HPP
25#define SHARE_GC_Z_ZREFERENCEPROCESSOR_HPP
26
27#include "gc/shared/referenceDiscoverer.hpp"
28#include "gc/z/zValue.hpp"
29
30class ReferencePolicy;
31class ZWorkers;
32
33class ZReferenceProcessor : public ReferenceDiscoverer {
34 friend class ZReferenceProcessorTask;
35
36private:
37 static const size_t reference_type_count = REF_PHANTOM + 1;
38 typedef size_t Counters[reference_type_count];
39
40 ZWorkers* const _workers;
41 ReferencePolicy* _soft_reference_policy;
42 ZPerWorker<Counters> _encountered_count;
43 ZPerWorker<Counters> _discovered_count;
44 ZPerWorker<Counters> _enqueued_count;
45 ZPerWorker<oop> _discovered_list;
46 ZContended<oop> _pending_list;
47 oop* _pending_list_tail;
48
49 bool is_inactive(oop reference, oop referent, ReferenceType type) const;
50 bool is_strongly_live(oop referent) const;
51 bool is_softly_live(oop reference, ReferenceType type) const;
52
53 bool should_discover(oop reference, ReferenceType type) const;
54 bool should_drop(oop reference, ReferenceType type) const;
55 void keep_alive(oop reference, ReferenceType type) const;
56 void make_inactive(oop reference, ReferenceType type) const;
57
58 void discover(oop reference, ReferenceType type);
59
60 oop drop(oop reference, ReferenceType type);
61 oop* keep(oop reference, ReferenceType type);
62
63 bool is_empty() const;
64
65 void work();
66 void collect_statistics();
67
68public:
69 ZReferenceProcessor(ZWorkers* workers);
70
71 void set_soft_reference_policy(bool clear);
72 void reset_statistics();
73
74 virtual bool discover_reference(oop reference, ReferenceType type);
75 void process_references();
76 void enqueue_references();
77};
78
79#endif // SHARE_GC_Z_ZREFERENCEPROCESSOR_HPP
80