1/*
2 * Copyright (c) 2014, 2018, 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
25#include "precompiled.hpp"
26#include "classfile/stringTable.hpp"
27#include "gc/shared/stringdedup/stringDedup.hpp"
28#include "gc/shared/stringdedup/stringDedupQueue.hpp"
29#include "gc/shared/stringdedup/stringDedupQueue.inline.hpp"
30#include "gc/shared/stringdedup/stringDedupTable.hpp"
31#include "gc/shared/stringdedup/stringDedupThread.hpp"
32#include "gc/shared/suspendibleThreadSet.hpp"
33#include "logging/log.hpp"
34#include "oops/access.inline.hpp"
35#include "oops/oop.inline.hpp"
36#include "runtime/atomic.hpp"
37
38StringDedupThread* StringDedupThread::_thread = NULL;
39
40StringDedupThread::StringDedupThread() :
41 ConcurrentGCThread() {
42 set_name("StrDedup");
43 create_and_start();
44}
45
46StringDedupThread::~StringDedupThread() {
47 ShouldNotReachHere();
48}
49
50StringDedupThread* StringDedupThread::thread() {
51 assert(_thread != NULL, "String deduplication thread not created");
52 return _thread;
53}
54
55class StringDedupSharedClosure: public OopClosure {
56 private:
57 StringDedupStat* _stat;
58
59 public:
60 StringDedupSharedClosure(StringDedupStat* stat) : _stat(stat) {}
61
62 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
63 virtual void do_oop(oop* p) {
64 oop java_string = RawAccess<>::oop_load(p);
65 StringDedupTable::deduplicate(java_string, _stat);
66 }
67};
68
69// The CDS archive does not include the string deduplication table. Only the string
70// table is saved in the archive. The shared strings from CDS archive need to be
71// added to the string deduplication table before deduplication occurs. That is
72// done in the beginning of the StringDedupThread (see StringDedupThread::do_deduplication()).
73void StringDedupThread::deduplicate_shared_strings(StringDedupStat* stat) {
74 StringDedupSharedClosure sharedStringDedup(stat);
75 StringTable::shared_oops_do(&sharedStringDedup);
76}
77
78void StringDedupThread::stop_service() {
79 StringDedupQueue::cancel_wait();
80}
81
82void StringDedupThread::print_start(const StringDedupStat* last_stat) {
83 StringDedupStat::print_start(last_stat);
84}
85
86void StringDedupThread::print_end(const StringDedupStat* last_stat, const StringDedupStat* total_stat) {
87 StringDedupStat::print_end(last_stat, total_stat);
88 if (log_is_enabled(Debug, gc, stringdedup)) {
89 last_stat->print_statistics(false);
90 total_stat->print_statistics(true);
91
92 StringDedupTable::print_statistics();
93 StringDedupQueue::print_statistics();
94 }
95}
96