1 /*
2 * Copyright (c) 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_INLINE_HPP
25 #define SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP
26
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "gc/shared/oopStorageParState.inline.hpp"
29 #include "gc/shenandoah/shenandoahHeuristics.hpp"
30 #include "gc/shenandoah/shenandoahRootProcessor.hpp"
31 #include "gc/shenandoah/shenandoahTimingTracker.hpp"
32 #include "gc/shenandoah/shenandoahUtils.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "runtime/safepoint.hpp"
35
36 template <bool CONCURRENT>
37 ShenandoahJNIHandleRoots<CONCURRENT>::ShenandoahJNIHandleRoots() :
38 _itr(JNIHandles::global_handles()) {
39 }
40
41 template <bool CONCURRENT>
42 template <typename T>
43 void ShenandoahJNIHandleRoots<CONCURRENT>::oops_do(T* cl, uint worker_id) {
44 if (CONCURRENT) {
45 _itr.oops_do(cl);
46 } else {
47 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
48 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::JNIRoots, worker_id);
49 _itr.oops_do(cl);
50 }
51 }
52
53 template <typename IsAlive, typename KeepAlive>
54 void ShenandoahWeakRoots::oops_do(IsAlive* is_alive, KeepAlive* keep_alive, uint worker_id) {
55 _task.work<IsAlive, KeepAlive>(worker_id, is_alive, keep_alive);
56 }
57
58 template <bool SINGLE_THREADED>
59 ShenandoahClassLoaderDataRoots<SINGLE_THREADED>::ShenandoahClassLoaderDataRoots() {
60 if (!SINGLE_THREADED) {
61 ClassLoaderDataGraph::clear_claimed_marks();
62 }
63 }
64
65 template <bool SINGLE_THREADED>
66 void ShenandoahClassLoaderDataRoots<SINGLE_THREADED>::clds_do(CLDClosure* strong_clds, CLDClosure* weak_clds, uint worker_id) {
67 if (SINGLE_THREADED) {
68 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
69 assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
70
71 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds);
72 } else {
73 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
74 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::CLDGRoots, worker_id);
75 ClassLoaderDataGraph::roots_cld_do(strong_clds, weak_clds);
76 }
77 }
78
79 template <typename ITR>
80 ShenandoahCodeCacheRoots<ITR>::ShenandoahCodeCacheRoots() {
81 nmethod::oops_do_marking_prologue();
82 }
83
84 template <typename ITR>
85 void ShenandoahCodeCacheRoots<ITR>::code_blobs_do(CodeBlobClosure* blob_cl, uint worker_id) {
86 ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
87 ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::CodeCacheRoots, worker_id);
88 _coderoots_iterator.possibly_parallel_blobs_do(blob_cl);
89 }
90
91 template <typename ITR>
92 ShenandoahCodeCacheRoots<ITR>::~ShenandoahCodeCacheRoots() {
93 nmethod::oops_do_marking_epilogue();
94 }
95
96 class ShenandoahParallelOopsDoThreadClosure : public ThreadClosure {
97 private:
98 OopClosure* _f;
99 CodeBlobClosure* _cf;
100 ThreadClosure* _thread_cl;
101 public:
102 ShenandoahParallelOopsDoThreadClosure(OopClosure* f, CodeBlobClosure* cf, ThreadClosure* thread_cl) :
103 _f(f), _cf(cf), _thread_cl(thread_cl) {}
104
105 void do_thread(Thread* t) {
106 if (_thread_cl != NULL) {
107 _thread_cl->do_thread(t);
108 }
109 t->oops_do(_f, _cf);
110 }
111 };
112
113 template <typename ITR>
114 ShenandoahRootScanner<ITR>::ShenandoahRootScanner(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
115 ShenandoahRootProcessor(phase),
116 _thread_roots(n_workers > 1) {
117 }
118
119 template <typename ITR>
120 void ShenandoahRootScanner<ITR>::roots_do(uint worker_id, OopClosure* oops) {
121 CLDToOopClosure clds_cl(oops, ClassLoaderData::_claim_strong);
122 MarkingCodeBlobClosure blobs_cl(oops, !CodeBlobToOopClosure::FixRelocations);
123 roots_do(worker_id, oops, &clds_cl, &blobs_cl);
124 }
125
126 template <typename ITR>
127 void ShenandoahRootScanner<ITR>::strong_roots_do(uint worker_id, OopClosure* oops) {
128 CLDToOopClosure clds_cl(oops, ClassLoaderData::_claim_strong);
129 MarkingCodeBlobClosure blobs_cl(oops, !CodeBlobToOopClosure::FixRelocations);
130 strong_roots_do(worker_id, oops, &clds_cl, &blobs_cl);
131 }
132
133 template <typename ITR>
134 void ShenandoahRootScanner<ITR>::roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure *tc) {
135 assert(!ShenandoahSafepoint::is_at_shenandoah_safepoint() ||
136 !ShenandoahHeap::heap()->unload_classes() ||
137 ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc(),
138 "Expect class unloading or traversal when Shenandoah cycle is running");
139 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, code, tc);
140 ResourceMark rm;
141
142 _serial_roots.oops_do(oops, worker_id);
143 _jni_roots.oops_do(oops, worker_id);
144 _cld_roots.clds_do(clds, clds, worker_id);
145 _thread_roots.threads_do(&tc_cl, worker_id);
146
147 // With ShenandoahConcurrentScanCodeRoots, we avoid scanning the entire code cache here,
148 // and instead do that in concurrent phase under the relevant lock. This saves init mark
149 // pause time.
150 if (code != NULL && !ShenandoahConcurrentScanCodeRoots) {
151 _code_roots.code_blobs_do(code, worker_id);
152 }
153 }
154
155 template <typename ITR>
156 void ShenandoahRootScanner<ITR>::strong_roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure* tc) {
157 assert(ShenandoahHeap::heap()->unload_classes(), "Should be used during class unloading");
158 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, code, tc);
159 ResourceMark rm;
160
161 _serial_roots.oops_do(oops, worker_id);
162 _jni_roots.oops_do(oops, worker_id);
163 _cld_roots.clds_do(clds, NULL, worker_id);
164 _thread_roots.threads_do(&tc_cl, worker_id);
165 }
166
167 template <typename IsAlive, typename KeepAlive>
168 void ShenandoahRootUpdater::roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive) {
169 CodeBlobToOopClosure update_blobs(keep_alive, CodeBlobToOopClosure::FixRelocations);
170 CLDToOopClosure clds(keep_alive, ClassLoaderData::_claim_strong);
171 CLDToOopClosure* weak_clds = ShenandoahHeap::heap()->unload_classes() ? NULL : &clds;
172
173 _serial_roots.oops_do(keep_alive, worker_id);
174 _jni_roots.oops_do(keep_alive, worker_id);
175
176 _thread_roots.oops_do(keep_alive, NULL, worker_id);
177 _cld_roots.clds_do(&clds, weak_clds, worker_id);
178
179 if(_update_code_cache) {
180 _code_roots.code_blobs_do(&update_blobs, worker_id);
181 }
182
183 _weak_roots.oops_do<IsAlive, KeepAlive>(is_alive, keep_alive, worker_id);
184 _dedup_roots.oops_do(is_alive, keep_alive, worker_id);
185 }
186
187 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP