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_SHENANDOAHCONCURRENTGC_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHCONCURRENTGC_HPP
27
28 #include "gc/shared/gcCause.hpp"
29 #include "gc/shenandoah/shenandoahConcurrentMark.hpp"
30 #include "gc/shenandoah/shenandoahGC.hpp"
31 #include "gc/shenandoah/shenandoahHeap.hpp"
32
33 class ShenandoahGeneration;
34
35 class VM_ShenandoahInitMark;
36 class VM_ShenandoahFinalMarkStartEvac;
37 class VM_ShenandoahInitUpdateRefs;
38 class VM_ShenandoahFinalUpdateRefs;
39
40 class ShenandoahConcurrentGC : public ShenandoahGC {
41 friend class VM_ShenandoahInitMark;
42 friend class VM_ShenandoahFinalMarkStartEvac;
43 friend class VM_ShenandoahInitUpdateRefs;
44 friend class VM_ShenandoahFinalUpdateRefs;
45 friend class VM_ShenandoahFinalRoots;
46
47 protected:
48 ShenandoahConcurrentMark _mark;
49
50 private:
51 ShenandoahDegenPoint _degen_point;
52 bool _mixed_evac; // true iff most recent evacuation includes old-gen HeapRegions
53 const bool _do_old_gc_bootstrap;
54
55 protected:
56 ShenandoahGeneration* const _generation;
57
58 public:
59 ShenandoahConcurrentGC(ShenandoahGeneration* generation, bool do_old_gc_bootstrap);
60 bool collect(GCCause::Cause cause);
61 ShenandoahDegenPoint degen_point() const;
62
63 private:
64 // Entry points to STW GC operations, these cause a related safepoint, that then
65 // call the entry method below
66 void vmop_entry_init_mark();
67
68 protected:
69 void vmop_entry_final_mark();
70 void vmop_entry_final_roots();
71
72 private:
73 void vmop_entry_init_updaterefs();
74 void vmop_entry_final_updaterefs();
75
76 // Entry methods to normally STW GC operations. These set up logging, monitoring
77 // and workers for net VM operation
78 void entry_init_mark();
79 void entry_final_mark();
80 void entry_init_updaterefs();
81 void entry_final_updaterefs();
82 void entry_final_roots();
83
84 // Entry methods to normally concurrent GC operations. These set up logging, monitoring
85 // for concurrent operation.
86 void entry_reset();
87 void entry_mark_roots();
88
89 protected:
90 void entry_mark();
91 void entry_thread_roots();
92 void entry_weak_refs();
93 void entry_weak_roots();
94 void entry_class_unloading();
95 void entry_strong_roots();
96 void entry_cleanup_early();
97 virtual void op_final_mark();
98
99 private:
100 void entry_evacuate();
101 void entry_update_thread_roots();
102 void entry_updaterefs();
103 void entry_cleanup_complete();
104 void entry_global_coalesce_and_fill();
105
106 // Actual work for the phases
107 void op_reset();
108 void op_init_mark();
109 void op_mark_roots();
110 void op_mark();
111 void op_thread_roots();
112 void op_weak_refs();
113 void op_weak_roots();
114 void op_class_unloading();
115 void op_strong_roots();
116 void op_cleanup_early();
117 void op_evacuate();
118 void op_init_updaterefs();
119 void op_updaterefs();
120 void op_update_thread_roots();
121 void op_final_updaterefs();
122 void op_final_roots();
123 void op_cleanup_complete();
124 void op_global_coalesce_and_fill();
125
126 // Messages for GC trace events, they have to be immortal for
127 // passing around the logging/tracing systems
128 void init_mark_event_message(char* buf, size_t len) const;
129 void final_mark_event_message(char* buf, size_t len) const;
130 void conc_mark_event_message(char* buf, size_t len) const;
131
132 protected:
133 // Check GC cancellation and abort concurrent GC
134 bool check_cancellation_and_abort(ShenandoahDegenPoint point);
135 };
136
137 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCONCURRENTGC_HPP