1 /*
2 * Copyright (c) 2015, 2019, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
25 #define SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
26
27 #include "code/codeCache.hpp"
28 #include "gc/shared/oopStorageParState.hpp"
29 #include "gc/shenandoah/shenandoahCodeRoots.hpp"
30 #include "gc/shenandoah/shenandoahHeap.hpp"
31 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
32 #include "gc/shared/strongRootsScope.hpp"
33 #include "gc/shared/weakProcessor.hpp"
34 #include "gc/shared/weakProcessorPhaseTimes.hpp"
35 #include "gc/shared/workgroup.hpp"
36 #include "memory/allocation.hpp"
37 #include "memory/iterator.hpp"
38
39 class ParallelCLDRootIterator {
40 public:
41 ParallelCLDRootIterator();
42 void root_cld_do(CLDClosure* strong, CLDClosure* weak);
43 };
44
45 enum Shenandoah_process_roots_tasks {
46 SHENANDOAH_RP_PS_Universe_oops_do,
47 SHENANDOAH_RP_PS_JNIHandles_oops_do,
48 SHENANDOAH_RP_PS_ObjectSynchronizer_oops_do,
49 SHENANDOAH_RP_PS_Management_oops_do,
50 SHENANDOAH_RP_PS_SystemDictionary_oops_do,
51 SHENANDOAH_RP_PS_jvmti_oops_do,
52 // Leave this one last.
53 SHENANDOAH_RP_PS_NumElements
54 };
55
56 class ShenandoahRootProcessor : public StackObj {
57 SubTasksDone* _process_strong_tasks;
58 StrongRootsScope _srs;
59 OopStorage::ParState<false, false> _par_state_string;
60 ShenandoahPhaseTimings::Phase _phase;
61 ParallelCLDRootIterator _cld_iterator;
62 ShenandoahAllCodeRootsIterator _coderoots_all_iterator;
63 CodeBlobClosure* _threads_nmethods_cl;
64 WeakProcessorPhaseTimes _weak_processor_timings;
65 WeakProcessor::Task _weak_processor_task;
66 bool _processed_weak_roots;
67
68 void process_java_roots(OopClosure* scan_non_heap_roots,
69 CLDClosure* scan_strong_clds,
70 CLDClosure* scan_weak_clds,
71 CodeBlobClosure* scan_strong_code,
72 ThreadClosure* thread_cl,
73 uint worker_i);
74
75 void process_vm_roots(OopClosure* scan_non_heap_roots,
76 uint worker_i);
77
78 void weak_processor_timing_to_shenandoah_timing(const WeakProcessorPhases::Phase wpp,
79 const ShenandoahPhaseTimings::GCParPhases spp,
80 ShenandoahWorkerTimings* worker_times) const;
81
82 public:
83 ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,
84 ShenandoahPhaseTimings::Phase phase);
85 ~ShenandoahRootProcessor();
86
87 // Apply oops, clds and blobs to all strongly reachable roots in the system.
88 // Optionally, apply class loader closure to weak clds, depending on class unloading
89 // for the particular GC cycles.
90 void process_strong_roots(OopClosure* oops,
91 CLDClosure* clds,
92 CodeBlobClosure* blobs,
93 ThreadClosure* thread_cl,
94 uint worker_id);
95
96 // Apply oops, clds and blobs to strongly reachable roots in the system
97 void process_all_roots(OopClosure* oops,
98 CLDClosure* clds,
99 CodeBlobClosure* blobs,
100 ThreadClosure* thread_cl,
101 uint worker_id);
102
103 // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
104 template <typename IsAlive>
105 void update_all_roots(OopClosure* oops,
106 CLDClosure* clds,
107 CodeBlobClosure* blobs,
108 ThreadClosure* thread_cl,
109 uint worker_id);
110
111 // For slow debug/verification code
112 void process_all_roots_slow(OopClosure* oops);
113
114 // Number of worker threads used by the root processor.
115 uint n_workers() const;
116 };
117
118 class ShenandoahRootEvacuator : public StackObj {
119 SubTasksDone* _evacuation_tasks;
120 StrongRootsScope _srs;
121 ShenandoahPhaseTimings::Phase _phase;
122 ShenandoahCsetCodeRootsIterator _coderoots_cset_iterator;
123 OopStorage::ParState<false, false> _par_state_string;
124
125 enum Shenandoah_evacuate_roots_tasks {
126 SHENANDOAH_EVAC_Universe_oops_do,
127 SHENANDOAH_EVAC_ObjectSynchronizer_oops_do,
128 SHENANDOAH_EVAC_Management_oops_do,
129 SHENANDOAH_EVAC_SystemDictionary_oops_do,
130 SHENANDOAH_EVAC_jvmti_oops_do,
131 // Leave this one last.
132 SHENANDOAH_EVAC_NumElements
133 };
134 public:
135 ShenandoahRootEvacuator(ShenandoahHeap* heap, uint n_workers,
136 ShenandoahPhaseTimings::Phase phase);
137 ~ShenandoahRootEvacuator();
138
139 void process_evacuate_roots(OopClosure* oops,
140 CodeBlobClosure* blobs,
141 uint worker_id);
142
143 // Number of worker threads used by the root processor.
144 uint n_workers() const;
145 };
146 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP