1 /*
2 * Copyright (c) 2019, 2020, 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_SHENANDOAHROOTPROCESSOR_INLINE_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP
27
28 #include "classfile/classLoaderDataGraph.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "gc/shared/oopStorageParState.inline.hpp"
32 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
33 #include "gc/shenandoah/shenandoahConcurrentRoots.hpp"
34 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
35 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
36 #include "gc/shenandoah/shenandoahRootProcessor.hpp"
37 #include "gc/shenandoah/shenandoahUtils.hpp"
38 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "prims/resolvedMethodTable.hpp"
41 #include "runtime/safepoint.hpp"
42
43 template <bool CONCURRENT>
44 inline ShenandoahVMRoot<CONCURRENT>::ShenandoahVMRoot(OopStorage* storage,
45 ShenandoahPhaseTimings::Phase phase, ShenandoahPhaseTimings::ParPhase par_phase) :
46 _itr(storage), _phase(phase), _par_phase(par_phase) {
47 }
48
49 template <bool CONCURRENT>
50 template <typename Closure>
51 inline void ShenandoahVMRoot<CONCURRENT>::oops_do(Closure* cl, uint worker_id) {
52 ShenandoahWorkerTimingsTracker timer(_phase, _par_phase, worker_id);
53 _itr.oops_do(cl);
54 }
55
56 template <bool CONCURRENT>
57 inline ShenandoahWeakRoot<CONCURRENT>::ShenandoahWeakRoot(OopStorage* storage,
58 ShenandoahPhaseTimings::Phase phase, ShenandoahPhaseTimings::ParPhase par_phase) :
59 ShenandoahVMRoot<CONCURRENT>(storage, phase, par_phase) {
60 }
61
62 inline ShenandoahWeakRoot<false>::ShenandoahWeakRoot(OopStorage* storage,
63 ShenandoahPhaseTimings::Phase phase, ShenandoahPhaseTimings::ParPhase par_phase) :
64 _itr(storage), _phase(phase), _par_phase(par_phase) {
65 }
66
67 template <typename IsAliveClosure, typename KeepAliveClosure>
68 void ShenandoahWeakRoot<false /* concurrent */>::weak_oops_do(IsAliveClosure* is_alive, KeepAliveClosure* keep_alive, uint worker_id) {
69 ShenandoahWorkerTimingsTracker timer(_phase, _par_phase, worker_id);
70 _itr.weak_oops_do(is_alive, keep_alive);
71 }
72
73 template <bool CONCURRENT>
74 ShenandoahWeakRoots<CONCURRENT>::ShenandoahWeakRoots() :
75 _jni_roots(OopStorageSet::jni_weak(), ShenandoahPhaseTimings::JNIWeakRoots),
76 _string_table_roots(OopStorageSet::string_table_weak(), ShenandoahPhaseTimings::StringTableRoots),
77 _resolved_method_table_roots(OopStorageSet::resolved_method_table_weak(), ShenandoahPhaseTimings::ResolvedMethodTableRoots),
78 _vm_roots(OopStorageSet::vm_weak(), ShenandoahPhaseTimings::VMWeakRoots) {
79 StringTable::reset_dead_counter();
80 ResolvedMethodTable::reset_dead_counter();
81 }
82
83 template <bool CONCURRENT>
84 ShenandoahWeakRoots<CONCURRENT>::~ShenandoahWeakRoots() {
85 StringTable::finish_dead_counter();
86 ResolvedMethodTable::finish_dead_counter();
87 }
88
89 template <bool CONCURRENT>
90 template <typename Closure>
91 void ShenandoahWeakRoots<CONCURRENT>::oops_do(Closure* cl, uint worker_id) {
92 _jni_roots.oops_do(cl, worker_id);
93 _string_table_roots.oops_do(cl, worker_id);
94 _resolved_method_table_roots.oops_do(cl, worker_id);
95 _vm_roots.oops_do(cl, worker_id);
96 }
97
98 inline ShenandoahWeakRoots<false /* concurrent */>::ShenandoahWeakRoots(ShenandoahPhaseTimings::Phase phase) :
99 _jni_roots(OopStorageSet::jni_weak(), phase, ShenandoahPhaseTimings::JNIWeakRoots),
100 _string_table_roots(OopStorageSet::string_table_weak(), phase, ShenandoahPhaseTimings::StringTableRoots),
101 _resolved_method_table_roots(OopStorageSet::resolved_method_table_weak(), phase, ShenandoahPhaseTimings::ResolvedMethodTableRoots),
102 _vm_roots(OopStorageSet::vm_weak(), phase, ShenandoahPhaseTimings::VMWeakRoots) {
103 }
104
105 template <typename IsAliveClosure, typename KeepAliveClosure>
106 void ShenandoahWeakRoots<false /* concurrent*/>::weak_oops_do(IsAliveClosure* is_alive, KeepAliveClosure* keep_alive, uint worker_id) {
107 _jni_roots.weak_oops_do(is_alive, keep_alive, worker_id);
108 _string_table_roots.weak_oops_do(is_alive, keep_alive, worker_id);
109 _resolved_method_table_roots.weak_oops_do(is_alive, keep_alive, worker_id);
110 _vm_roots.weak_oops_do(is_alive, keep_alive, worker_id);
111 }
112
113 template <typename Closure>
114 void ShenandoahWeakRoots<false /* concurrent */>::oops_do(Closure* cl, uint worker_id) {
115 AlwaysTrueClosure always_true;
116 weak_oops_do<AlwaysTrueClosure, Closure>(&always_true, cl, worker_id);
117 }
118
119 template <bool CONCURRENT>
120 ShenandoahVMRoots<CONCURRENT>::ShenandoahVMRoots(ShenandoahPhaseTimings::Phase phase) :
121 _jni_handle_roots(OopStorageSet::jni_global(), phase, ShenandoahPhaseTimings::JNIRoots),
122 _vm_global_roots(OopStorageSet::vm_global(), phase, ShenandoahPhaseTimings::VMGlobalRoots) {
123 }
124
125 template <bool CONCURRENT>
126 template <typename T>
127 void ShenandoahVMRoots<CONCURRENT>::oops_do(T* cl, uint worker_id) {
128 _jni_handle_roots.oops_do(cl, worker_id);
129 _vm_global_roots.oops_do(cl, worker_id);
130 }
131
132 template <bool CONCURRENT, bool SINGLE_THREADED>
133 ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::ShenandoahClassLoaderDataRoots(ShenandoahPhaseTimings::Phase phase, uint n_workers) :
134 _semaphore(worker_count(n_workers)),
135 _phase(phase) {
136 if (!SINGLE_THREADED) {
137 ClassLoaderDataGraph::clear_claimed_marks();
138 }
139 if (CONCURRENT) {
140 ClassLoaderDataGraph_lock->lock();
141 }
142 }
143
144 template <bool CONCURRENT, bool SINGLE_THREADED>
145 ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::~ShenandoahClassLoaderDataRoots() {
146 if (CONCURRENT) {
147 ClassLoaderDataGraph_lock->unlock();
148 }
149 }
150
151
152 template <bool CONCURRENT, bool SINGLE_THREADED>
153 void ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::always_strong_cld_do(CLDClosure* clds, uint worker_id) {
154 if (SINGLE_THREADED) {
155 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
156 assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
157 ClassLoaderDataGraph::always_strong_cld_do(clds);
158 } else if (_semaphore.try_acquire()) {
159 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CLDGRoots, worker_id);
160 ClassLoaderDataGraph::always_strong_cld_do(clds);
161 _semaphore.claim_all();
162 }
163 }
164
165 template <bool CONCURRENT, bool SINGLE_THREADED>
166 void ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::cld_do(CLDClosure* clds, uint worker_id) {
167 if (SINGLE_THREADED) {
168 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
169 assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
170 ClassLoaderDataGraph::cld_do(clds);
171 } else if (_semaphore.try_acquire()) {
172 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CLDGRoots, worker_id);
173 ClassLoaderDataGraph::cld_do(clds);
174 _semaphore.claim_all();
175 }
176 }
177
178 class ShenandoahParallelOopsDoThreadClosure : public ThreadClosure {
179 private:
180 OopClosure* _f;
181 CodeBlobClosure* _cf;
182 ThreadClosure* _thread_cl;
183 public:
184 ShenandoahParallelOopsDoThreadClosure(OopClosure* f, CodeBlobClosure* cf, ThreadClosure* thread_cl) :
185 _f(f), _cf(cf), _thread_cl(thread_cl) {}
186
187 void do_thread(Thread* t) {
188 if (_thread_cl != NULL) {
189 _thread_cl->do_thread(t);
190 }
191 t->oops_do(_f, _cf);
192 }
193 };
194
195 template <bool CONCURRENT>
196 ShenandoahConcurrentRootScanner<CONCURRENT>::ShenandoahConcurrentRootScanner(uint n_workers,
197 ShenandoahPhaseTimings::Phase phase) :
198 _vm_roots(phase),
199 _cld_roots(phase, n_workers),
200 _dedup_roots(phase),
201 _codecache_snapshot(NULL),
202 _phase(phase) {
203 if (!ShenandoahHeap::heap()->unload_classes()) {
204 if (CONCURRENT) {
205 CodeCache_lock->lock_without_safepoint_check();
206 } else {
207 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
208 }
209 _codecache_snapshot = ShenandoahCodeRoots::table()->snapshot_for_iteration();
210 }
211 assert(!CONCURRENT || !ShenandoahHeap::heap()->has_forwarded_objects(), "Not expecting forwarded pointers during concurrent marking");
212 }
213
214 template <bool CONCURRENT>
215 ShenandoahConcurrentRootScanner<CONCURRENT>::~ShenandoahConcurrentRootScanner() {
216 if (!ShenandoahHeap::heap()->unload_classes()) {
217 ShenandoahCodeRoots::table()->finish_iteration(_codecache_snapshot);
218 if (CONCURRENT) {
219 CodeCache_lock->unlock();
220 }
221 }
222 }
223
224 template <bool CONCURRENT>
225 void ShenandoahConcurrentRootScanner<CONCURRENT>::oops_do(OopClosure* oops, uint worker_id) {
226 ShenandoahHeap* const heap = ShenandoahHeap::heap();
227 CLDToOopClosure clds_cl(oops, CONCURRENT ? ClassLoaderData::_claim_strong : ClassLoaderData::_claim_none);
228 _vm_roots.oops_do(oops, worker_id);
229
230 if (!heap->unload_classes()) {
231 AlwaysTrueClosure always_true;
232 _cld_roots.cld_do(&clds_cl, worker_id);
233 _dedup_roots.oops_do(&always_true, oops, worker_id);
234 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CodeCacheRoots, worker_id);
235 CodeBlobToOopClosure blobs(oops, !CodeBlobToOopClosure::FixRelocations);
236 _codecache_snapshot->parallel_blobs_do(&blobs);
237 } else {
238 _cld_roots.always_strong_cld_do(&clds_cl, worker_id);
239 }
240 }
241
242 template <typename IsAlive, typename KeepAlive>
243 void ShenandoahRootUpdater::roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive) {
244 CodeBlobToOopClosure update_blobs(keep_alive, CodeBlobToOopClosure::FixRelocations);
245 ShenandoahCodeBlobAndDisarmClosure blobs_and_disarm_Cl(keep_alive);
246 CodeBlobToOopClosure* codes_cl = ShenandoahConcurrentRoots::can_do_concurrent_class_unloading() ?
247 static_cast<CodeBlobToOopClosure*>(&blobs_and_disarm_Cl) :
248 static_cast<CodeBlobToOopClosure*>(&update_blobs);
249
250 CLDToOopClosure clds(keep_alive, ClassLoaderData::_claim_strong);
251
252 // Process serial-claiming roots first
253 _serial_roots.oops_do(keep_alive, worker_id);
254 _serial_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);
255
256 // Process light-weight/limited parallel roots then
257 _vm_roots.oops_do(keep_alive, worker_id);
258 _weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);
259 _dedup_roots.oops_do(is_alive, keep_alive, worker_id);
260 _cld_roots.cld_do(&clds, worker_id);
261
262 // Process heavy-weight/fully parallel roots the last
263 _code_roots.code_blobs_do(codes_cl, worker_id);
264 _thread_roots.oops_do(keep_alive, NULL, worker_id);
265 }
266
267 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP