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 ShenandoahSerialRoot {
40 public:
41 typedef void (*OopsDo)(OopClosure*);
42 private:
43 volatile bool _claimed;
44 const OopsDo _oops_do;
45 const ShenandoahPhaseTimings::GCParPhases _phase;
46
47 public:
48 ShenandoahSerialRoot(OopsDo oops_do, ShenandoahPhaseTimings::GCParPhases);
49 void oops_do(OopClosure* cl, uint worker_id);
50 };
51
52 class ShenandoahSerialRoots {
53 private:
54 ShenandoahSerialRoot _universe_root;
55 ShenandoahSerialRoot _object_synchronizer_root;
56 ShenandoahSerialRoot _management_root;
57 ShenandoahSerialRoot _system_dictionary_root;
58 ShenandoahSerialRoot _jvmti_root;
59 public:
60 ShenandoahSerialRoots();
61 void oops_do(OopClosure* cl, uint worker_id);
62 };
63
64 class ShenandoahJNIHandleRoots : public ShenandoahSerialRoot {
65 public:
66 ShenandoahJNIHandleRoots();
67 };
68
69 class ShenandoahThreadRoots {
70 private:
71 const bool _is_par;
72 public:
73 ShenandoahThreadRoots(bool is_par);
74 ~ShenandoahThreadRoots();
75
76 void oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id);
77 void threads_do(ThreadClosure* tc, uint worker_id);
78 };
79
80 class ShenandoahWeakRoots {
81 private:
82 WeakProcessorPhaseTimes _process_timings;
83 WeakProcessor::Task _task;
84 public:
85 ShenandoahWeakRoots(uint n_workers);
86 ~ShenandoahWeakRoots();
87
88 template <typename IsAlive, typename KeepAlive>
89 void oops_do(IsAlive* is_alive, KeepAlive* keep_alive, uint worker_id);
90 };
91
92 class ShenandoahStringDedupRoots {
93 public:
94 ShenandoahStringDedupRoots();
95 ~ShenandoahStringDedupRoots();
96
97 void oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id);
98 };
99
100 template <typename ITR>
101 class ShenandoahCodeCacheRoots {
102 private:
103 ITR _coderoots_iterator;
104 public:
105 ShenandoahCodeCacheRoots();
106 ~ShenandoahCodeCacheRoots();
107
108 void code_blobs_do(CodeBlobClosure* blob_cl, uint worker_id);
109 };
110
111 class ShenandoahClassLoaderDataRoots {
112 public:
113 ShenandoahClassLoaderDataRoots();
114
115 void always_strong_cld_do(CLDClosure* clds, uint worker_id);
116 void cld_do(CLDClosure* clds, uint worker_id);
117 };
118
119 class ShenandoahRootProcessor : public StackObj {
120 private:
121 ShenandoahHeap* const _heap;
122 const ShenandoahPhaseTimings::Phase _phase;
123 public:
124 ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase);
125 ~ShenandoahRootProcessor();
126
127 ShenandoahHeap* heap() const { return _heap; }
128 };
129
130 template <typename ITR>
131 class ShenandoahRootScanner : public ShenandoahRootProcessor {
132 private:
133 ShenandoahSerialRoots _serial_roots;
134 ShenandoahJNIHandleRoots _jni_roots;
135 ShenandoahClassLoaderDataRoots _cld_roots;
136 ShenandoahThreadRoots _thread_roots;
137 ShenandoahCodeCacheRoots<ITR> _code_roots;
138 public:
139 ShenandoahRootScanner(uint n_workers, ShenandoahPhaseTimings::Phase phase);
140
141 // Apply oops, clds and blobs to all strongly reachable roots in the system,
142 // during class unloading cycle
143 void strong_roots_do(uint worker_id, OopClosure* cl);
144 void strong_roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure* tc = NULL);
145
146 // Apply oops, clds and blobs to all strongly reachable roots and weakly reachable
147 // roots when class unloading is disabled during this cycle
148 void roots_do(uint worker_id, OopClosure* cl);
149 void roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure* tc = NULL);
150 // For heap object iteration
151 void roots_do_unchecked(OopClosure* cl);
152 void strong_roots_do_unchecked(OopClosure* cl);
153 };
154
155 typedef ShenandoahRootScanner<ShenandoahAllCodeRootsIterator> ShenandoahAllRootScanner;
156 typedef ShenandoahRootScanner<ShenandoahCsetCodeRootsIterator> ShenandoahCSetRootScanner;
157
158 // Evacuate all roots at a safepoint
159 class ShenandoahRootEvacuator : public ShenandoahRootProcessor {
160 private:
161 ShenandoahSerialRoots _serial_roots;
162 ShenandoahJNIHandleRoots _jni_roots;
163 ShenandoahClassLoaderDataRoots _cld_roots;
164 ShenandoahThreadRoots _thread_roots;
165 ShenandoahWeakRoots _weak_roots;
166 ShenandoahStringDedupRoots _dedup_roots;
167 ShenandoahCodeCacheRoots<ShenandoahCsetCodeRootsIterator> _code_roots;
168
169 public:
170 ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase);
171
172 void roots_do(uint worker_id, OopClosure* oops);
173 };
174
175 // Update all roots at a safepoint
176 class ShenandoahRootUpdater : public ShenandoahRootProcessor {
177 private:
178 ShenandoahSerialRoots _serial_roots;
179 ShenandoahJNIHandleRoots _jni_roots;
180 ShenandoahClassLoaderDataRoots _cld_roots;
181 ShenandoahThreadRoots _thread_roots;
182 ShenandoahWeakRoots _weak_roots;
183 ShenandoahStringDedupRoots _dedup_roots;
184 ShenandoahCodeCacheRoots<ShenandoahCsetCodeRootsIterator> _code_roots;
185 const bool _update_code_cache;
186
187 public:
188 ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache);
189
190 template<typename IsAlive, typename KeepAlive>
191 void roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive);
192 };
193
194 // Adjuster all roots at a safepoint during full gc
195 class ShenandoahRootAdjuster : public ShenandoahRootProcessor {
196 private:
197 ShenandoahSerialRoots _serial_roots;
198 ShenandoahJNIHandleRoots _jni_roots;
199 ShenandoahClassLoaderDataRoots _cld_roots;
200 ShenandoahThreadRoots _thread_roots;
201 ShenandoahWeakRoots _weak_roots;
202 ShenandoahStringDedupRoots _dedup_roots;
203 ShenandoahCodeCacheRoots<ShenandoahAllCodeRootsIterator> _code_roots;
204
205 public:
206 ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase);
207
208 void roots_do(uint worker_id, OopClosure* oops);
209 };
210
211 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP