1/*
2 * Copyright (c) 2018, 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.
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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
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23 */
24
25#ifndef SHARE_GC_SHARED_PARALLELCLEANING_HPP
26#define SHARE_GC_SHARED_PARALLELCLEANING_HPP
27
28#include "classfile/classLoaderDataGraph.hpp"
29#include "code/codeCache.hpp"
30#include "gc/shared/oopStorageParState.hpp"
31#include "gc/shared/stringdedup/stringDedup.hpp"
32#include "gc/shared/workgroup.hpp"
33
34class ParallelCleaningTask;
35
36class StringDedupCleaningTask : public AbstractGangTask {
37 StringDedupUnlinkOrOopsDoClosure _dedup_closure;
38
39public:
40 StringDedupCleaningTask(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool resize_table);
41 ~StringDedupCleaningTask();
42
43 void work(uint worker_id);
44};
45
46class CodeCacheUnloadingTask {
47
48 CodeCache::UnloadingScope _unloading_scope;
49 const bool _unloading_occurred;
50 const uint _num_workers;
51
52 // Variables used to claim nmethods.
53 CompiledMethod* _first_nmethod;
54 CompiledMethod* volatile _claimed_nmethod;
55
56public:
57 CodeCacheUnloadingTask(uint num_workers, BoolObjectClosure* is_alive, bool unloading_occurred);
58 ~CodeCacheUnloadingTask();
59
60private:
61 static const int MaxClaimNmethods = 16;
62 void claim_nmethods(CompiledMethod** claimed_nmethods, int *num_claimed_nmethods);
63
64public:
65 // Cleaning and unloading of nmethods.
66 void work(uint worker_id);
67};
68
69
70class KlassCleaningTask : public StackObj {
71 volatile int _clean_klass_tree_claimed;
72 ClassLoaderDataGraphKlassIteratorAtomic _klass_iterator;
73
74public:
75 KlassCleaningTask();
76
77private:
78 bool claim_clean_klass_tree_task();
79 InstanceKlass* claim_next_klass();
80
81public:
82
83 void clean_klass(InstanceKlass* ik) {
84 ik->clean_weak_instanceklass_links();
85 }
86
87 void work();
88};
89
90#if INCLUDE_JVMCI
91class JVMCICleaningTask : public StackObj {
92 volatile int _cleaning_claimed;
93
94public:
95 JVMCICleaningTask();
96 // Clean JVMCI metadata handles.
97 void work(bool unloading_occurred);
98
99private:
100 bool claim_cleaning_task();
101};
102#endif
103
104// Do cleanup of some weakly held data in the same parallel task.
105// Assumes a non-moving context.
106class ParallelCleaningTask : public AbstractGangTask {
107private:
108 bool _unloading_occurred;
109 StringDedupCleaningTask _string_dedup_task;
110 CodeCacheUnloadingTask _code_cache_task;
111#if INCLUDE_JVMCI
112 JVMCICleaningTask _jvmci_cleaning_task;
113#endif
114 KlassCleaningTask _klass_cleaning_task;
115
116public:
117 // The constructor is run in the VMThread.
118 ParallelCleaningTask(BoolObjectClosure* is_alive,
119 uint num_workers,
120 bool unloading_occurred,
121 bool resize_dedup_table);
122
123 void work(uint worker_id);
124};
125
126#endif // SHARE_GC_SHARED_PARALLELCLEANING_HPP
127