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 }
80
81 template <bool CONCURRENT>
82 template <typename Closure>
83 void ShenandoahWeakRoots<CONCURRENT>::oops_do(Closure* cl, uint worker_id) {
84 _jni_roots.oops_do(cl, worker_id);
85 _string_table_roots.oops_do(cl, worker_id);
86 _resolved_method_table_roots.oops_do(cl, worker_id);
87 _vm_roots.oops_do(cl, worker_id);
88 }
89
90 inline ShenandoahWeakRoots<false /* concurrent */>::ShenandoahWeakRoots(ShenandoahPhaseTimings::Phase phase) :
91 _jni_roots(OopStorageSet::jni_weak(), phase, ShenandoahPhaseTimings::JNIWeakRoots),
92 _string_table_roots(OopStorageSet::string_table_weak(), phase, ShenandoahPhaseTimings::StringTableRoots),
93 _resolved_method_table_roots(OopStorageSet::resolved_method_table_weak(), phase, ShenandoahPhaseTimings::ResolvedMethodTableRoots),
94 _vm_roots(OopStorageSet::vm_weak(), phase, ShenandoahPhaseTimings::VMWeakRoots) {
95 }
96
97 template <typename IsAliveClosure, typename KeepAliveClosure>
98 void ShenandoahWeakRoots<false /* concurrent*/>::weak_oops_do(IsAliveClosure* is_alive, KeepAliveClosure* keep_alive, uint worker_id) {
99 _jni_roots.weak_oops_do(is_alive, keep_alive, worker_id);
100 _string_table_roots.weak_oops_do(is_alive, keep_alive, worker_id);
101 _resolved_method_table_roots.weak_oops_do(is_alive, keep_alive, worker_id);
102 _vm_roots.weak_oops_do(is_alive, keep_alive, worker_id);
103 }
104
105 template <typename Closure>
106 void ShenandoahWeakRoots<false /* concurrent */>::oops_do(Closure* cl, uint worker_id) {
107 AlwaysTrueClosure always_true;
108 weak_oops_do<AlwaysTrueClosure, Closure>(&always_true, cl, worker_id);
109 }
110
111 template <bool CONCURRENT>
112 ShenandoahVMRoots<CONCURRENT>::ShenandoahVMRoots(ShenandoahPhaseTimings::Phase phase) :
113 _jni_handle_roots(OopStorageSet::jni_global(), phase, ShenandoahPhaseTimings::JNIRoots),
114 _vm_global_roots(OopStorageSet::vm_global(), phase, ShenandoahPhaseTimings::VMGlobalRoots) {
115 }
116
117 template <bool CONCURRENT>
118 template <typename T>
119 void ShenandoahVMRoots<CONCURRENT>::oops_do(T* cl, uint worker_id) {
120 _jni_handle_roots.oops_do(cl, worker_id);
121 _vm_global_roots.oops_do(cl, worker_id);
122 }
123
124 template <bool CONCURRENT, bool SINGLE_THREADED>
125 ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::ShenandoahClassLoaderDataRoots(ShenandoahPhaseTimings::Phase phase, uint n_workers) :
126 _semaphore(worker_count(n_workers)),
127 _phase(phase) {
128 if (!SINGLE_THREADED) {
129 ClassLoaderDataGraph::clear_claimed_marks();
130 }
131 if (CONCURRENT) {
132 ClassLoaderDataGraph_lock->lock();
133 }
134 }
135
136 template <bool CONCURRENT, bool SINGLE_THREADED>
137 ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::~ShenandoahClassLoaderDataRoots() {
138 if (CONCURRENT) {
139 ClassLoaderDataGraph_lock->unlock();
140 }
141 }
142
143
144 template <bool CONCURRENT, bool SINGLE_THREADED>
145 void ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::always_strong_cld_do(CLDClosure* clds, uint worker_id) {
146 if (SINGLE_THREADED) {
147 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
148 assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
149 ClassLoaderDataGraph::always_strong_cld_do(clds);
150 } else if (_semaphore.try_acquire()) {
151 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CLDGRoots, worker_id);
152 ClassLoaderDataGraph::always_strong_cld_do(clds);
153 _semaphore.claim_all();
154 }
155 }
156
157 template <bool CONCURRENT, bool SINGLE_THREADED>
158 void ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::cld_do(CLDClosure* clds, uint worker_id) {
159 if (SINGLE_THREADED) {
160 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
161 assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
162 ClassLoaderDataGraph::cld_do(clds);
163 } else if (_semaphore.try_acquire()) {
164 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CLDGRoots, worker_id);
165 ClassLoaderDataGraph::cld_do(clds);
166 _semaphore.claim_all();
167 }
168 }
169
170 class ShenandoahParallelOopsDoThreadClosure : public ThreadClosure {
171 private:
172 OopClosure* _f;
173 CodeBlobClosure* _cf;
174 ThreadClosure* _thread_cl;
175 public:
176 ShenandoahParallelOopsDoThreadClosure(OopClosure* f, CodeBlobClosure* cf, ThreadClosure* thread_cl) :
177 _f(f), _cf(cf), _thread_cl(thread_cl) {}
178
179 void do_thread(Thread* t) {
180 if (_thread_cl != NULL) {
181 _thread_cl->do_thread(t);
182 }
183 t->oops_do(_f, _cf);
184 }
185 };
186
187 template <bool CONCURRENT>
188 ShenandoahConcurrentRootScanner<CONCURRENT>::ShenandoahConcurrentRootScanner(uint n_workers,
189 ShenandoahPhaseTimings::Phase phase) :
190 _vm_roots(phase),
191 _cld_roots(phase, n_workers),
192 _dedup_roots(phase),
193 _codecache_snapshot(NULL),
194 _phase(phase) {
195 if (!ShenandoahHeap::heap()->unload_classes()) {
196 if (CONCURRENT) {
197 CodeCache_lock->lock_without_safepoint_check();
198 } else {
199 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
200 }
201 _codecache_snapshot = ShenandoahCodeRoots::table()->snapshot_for_iteration();
202 }
203 assert(!CONCURRENT || !ShenandoahHeap::heap()->has_forwarded_objects(), "Not expecting forwarded pointers during concurrent marking");
204 }
205
206 template <bool CONCURRENT>
207 ShenandoahConcurrentRootScanner<CONCURRENT>::~ShenandoahConcurrentRootScanner() {
208 if (!ShenandoahHeap::heap()->unload_classes()) {
209 ShenandoahCodeRoots::table()->finish_iteration(_codecache_snapshot);
210 if (CONCURRENT) {
211 CodeCache_lock->unlock();
212 }
213 }
214 }
215
216 template <bool CONCURRENT>
217 void ShenandoahConcurrentRootScanner<CONCURRENT>::oops_do(OopClosure* oops, uint worker_id) {
218 ShenandoahHeap* const heap = ShenandoahHeap::heap();
219 CLDToOopClosure clds_cl(oops, CONCURRENT ? ClassLoaderData::_claim_strong : ClassLoaderData::_claim_none);
220 _vm_roots.oops_do(oops, worker_id);
221
222 if (!heap->unload_classes()) {
223 AlwaysTrueClosure always_true;
224 _cld_roots.cld_do(&clds_cl, worker_id);
225 _dedup_roots.oops_do(&always_true, oops, worker_id);
226 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CodeCacheRoots, worker_id);
227 CodeBlobToOopClosure blobs(oops, !CodeBlobToOopClosure::FixRelocations);
228 _codecache_snapshot->parallel_blobs_do(&blobs);
229 } else {
230 _cld_roots.always_strong_cld_do(&clds_cl, worker_id);
231 }
232 }
233
234 template <typename IsAlive, typename KeepAlive>
235 void ShenandoahRootUpdater::roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive) {
236 CodeBlobToOopClosure update_blobs(keep_alive, CodeBlobToOopClosure::FixRelocations);
237 ShenandoahCodeBlobAndDisarmClosure blobs_and_disarm_Cl(keep_alive);
238 CodeBlobToOopClosure* codes_cl = ShenandoahConcurrentRoots::can_do_concurrent_class_unloading() ?
239 static_cast<CodeBlobToOopClosure*>(&blobs_and_disarm_Cl) :
240 static_cast<CodeBlobToOopClosure*>(&update_blobs);
241
242 CLDToOopClosure clds(keep_alive, ClassLoaderData::_claim_strong);
243
244 // Process serial-claiming roots first
245 _serial_roots.oops_do(keep_alive, worker_id);
246 _serial_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);
247
248 // Process light-weight/limited parallel roots then
249 _vm_roots.oops_do(keep_alive, worker_id);
250 _weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);
251 _dedup_roots.oops_do(is_alive, keep_alive, worker_id);
252 _cld_roots.cld_do(&clds, worker_id);
253
254 // Process heavy-weight/fully parallel roots the last
255 _code_roots.code_blobs_do(codes_cl, worker_id);
256 _thread_roots.oops_do(keep_alive, NULL, worker_id);
257 }
258
259 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP