1 /*
2 * Copyright (c) 2021, Red Hat, Inc. 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 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHMARK_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHMARK_HPP
27
28 #include "gc/shared/stringdedup/stringDedup.hpp"
29 #include "gc/shared/taskTerminator.hpp"
30 #include "gc/shenandoah/shenandoahOopClosures.hpp"
31 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
32
33 // Base class for mark
34 // Mark class does not maintain states. Instead, mark states are
35 // maintained by task queues, mark bitmap and SATB buffers (concurrent mark)
36 class ShenandoahMark: public StackObj {
37
38 protected:
39 ShenandoahGeneration* const _generation;
40 ShenandoahObjToScanQueueSet* const _task_queues;
41 ShenandoahObjToScanQueueSet* const _old_gen_task_queues;
42
43 protected:
44 ShenandoahMark(ShenandoahGeneration* generation);
45
46 public:
47 template<class T, GenerationMode GENERATION>
48 static inline void mark_through_ref(T* p, ShenandoahObjToScanQueue* q, ShenandoahObjToScanQueue* old, ShenandoahMarkingContext* const mark_context, bool weak);
49
50 // Helpers
51 inline ShenandoahObjToScanQueueSet* task_queues() const;
52 ShenandoahObjToScanQueueSet* old_task_queues() {
53 return _old_gen_task_queues;
54 }
55
56 inline ShenandoahObjToScanQueue* get_queue(uint index) const;
57 inline ShenandoahObjToScanQueue* get_old_queue(uint index) const;
58
59 inline ShenandoahGeneration* generation() { return _generation; };
60
61 // ---------- Marking loop and tasks
62 private:
63 template <class T, StringDedupMode STRING_DEDUP>
64 inline void do_task(ShenandoahObjToScanQueue* q, T* cl, ShenandoahLiveData* live_data, StringDedup::Requests* const req, ShenandoahMarkTask* task);
65
66 template <class T>
67 inline void do_chunked_array_start(ShenandoahObjToScanQueue* q, T* cl, oop array, bool weak);
68
69 template <class T>
70 inline void do_chunked_array(ShenandoahObjToScanQueue* q, T* cl, oop array, int chunk, int pow, bool weak);
71
72 inline void count_liveness(ShenandoahLiveData* live_data, oop obj);
73
74 template <class T, GenerationMode GENERATION, bool CANCELLABLE, StringDedupMode STRING_DEDUP>
75 void mark_loop_work(T* cl, ShenandoahLiveData* live_data, uint worker_id, TaskTerminator *t, StringDedup::Requests* const req);
76
77 template <GenerationMode GENERATION, bool CANCELLABLE, StringDedupMode STRING_DEDUP>
78 void mark_loop_prework(uint worker_id, TaskTerminator *terminator, ShenandoahReferenceProcessor *rp, StringDedup::Requests* const req, bool update_refs);
79
80 template <GenerationMode GENERATION>
81 static bool in_generation(oop obj);
82
83 static void mark_ref(ShenandoahObjToScanQueue* q,
84 ShenandoahMarkingContext* const mark_context,
85 bool weak, oop obj);
86
87 template <StringDedupMode STRING_DEDUP>
88 inline void dedup_string(oop obj, StringDedup::Requests* const req);
89 protected:
90 template<bool CANCELLABLE, StringDedupMode STRING_DEDUP>
91 void mark_loop(GenerationMode generation, uint worker_id, TaskTerminator* terminator, ShenandoahReferenceProcessor *rp,
92 StringDedup::Requests* const req);
93
94 void mark_loop(GenerationMode generation, uint worker_id, TaskTerminator* terminator, ShenandoahReferenceProcessor *rp,
95 bool cancellable, StringDedupMode dedup_mode, StringDedup::Requests* const req);
96 };
97
98 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARK_HPP
99