1 /*
2 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. 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 #include "precompiled.hpp"
25 #include "classfile/classLoaderData.hpp"
26 #include "classfile/stringTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/oopMap.hpp"
30 #include "gc/shared/oopStorageParState.inline.hpp"
31 #include "gc/z/zGlobals.hpp"
32 #include "gc/z/zNMethodTable.hpp"
33 #include "gc/z/zOopClosures.inline.hpp"
34 #include "gc/z/zRootsIterator.hpp"
35 #include "gc/z/zStat.hpp"
36 #include "gc/z/zThreadLocalData.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/atomic.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/thread.hpp"
43 #include "runtime/safepoint.hpp"
44 #include "runtime/synchronizer.hpp"
45 #include "services/management.hpp"
46 #include "utilities/debug.hpp"
47 #if INCLUDE_JFR
48 #include "jfr/jfr.hpp"
49 #endif
50
51 static const ZStatSubPhase ZSubPhasePauseRootsSetup("Pause Roots Setup");
52 static const ZStatSubPhase ZSubPhasePauseRoots("Pause Roots");
53 static const ZStatSubPhase ZSubPhasePauseRootsTeardown("Pause Roots Teardown");
54 static const ZStatSubPhase ZSubPhasePauseRootsUniverse("Pause Roots Universe");
55 static const ZStatSubPhase ZSubPhasePauseRootsObjectSynchronizer("Pause Roots ObjectSynchronizer");
56 static const ZStatSubPhase ZSubPhasePauseRootsManagement("Pause Roots Management");
57 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIExport("Pause Roots JVMTIExport");
58 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIWeakExport("Pause Roots JVMTIWeakExport");
59 static const ZStatSubPhase ZSubPhasePauseRootsSystemDictionary("Pause Roots SystemDictionary");
60 static const ZStatSubPhase ZSubPhasePauseRootsThreads("Pause Roots Threads");
61 static const ZStatSubPhase ZSubPhasePauseRootsCodeCache("Pause Roots CodeCache");
62
63 static const ZStatSubPhase ZSubPhaseConcurrentRootsSetup("Concurrent Roots Setup");
64 static const ZStatSubPhase ZSubPhaseConcurrentRoots("Concurrent Roots");
65 static const ZStatSubPhase ZSubPhaseConcurrentRootsTeardown("Concurrent Roots Teardown");
66 static const ZStatSubPhase ZSubPhaseConcurrentRootsJNIHandles("Concurrent Roots JNIHandles");
67 static const ZStatSubPhase ZSubPhaseConcurrentRootsClassLoaderDataGraph("Concurrent Roots ClassLoaderDataGraph");
68
69 static const ZStatSubPhase ZSubPhasePauseWeakRootsSetup("Pause Weak Roots Setup");
70 static const ZStatSubPhase ZSubPhasePauseWeakRoots("Pause Weak Roots");
71 static const ZStatSubPhase ZSubPhasePauseWeakRootsTeardown("Pause Weak Roots Teardown");
72 static const ZStatSubPhase ZSubPhasePauseWeakRootsJVMTIWeakExport("Pause Weak Roots JVMTIWeakExport");
73 static const ZStatSubPhase ZSubPhasePauseWeakRootsJFRWeak("Pause Weak Roots JFRWeak");
74
75 static const ZStatSubPhase ZSubPhaseConcurrentWeakRoots("Concurrent Weak Roots");
76 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsVMWeakHandles("Concurrent Weak Roots VMWeakHandles");
77 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsJNIWeakHandles("Concurrent Weak Roots JNIWeakHandles");
78 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsStringTable("Concurrent Weak Roots StringTable");
79
80 template <typename T, void (T::*F)(OopClosure*)>
81 ZSerialOopsDo<T, F>::ZSerialOopsDo(T* iter) :
82 _iter(iter),
83 _claimed(false) {}
84
85 template <typename T, void (T::*F)(OopClosure*)>
86 void ZSerialOopsDo<T, F>::oops_do(OopClosure* cl) {
87 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
88 (_iter->*F)(cl);
89 }
90 }
91
92 template <typename T, void (T::*F)(OopClosure*)>
93 ZParallelOopsDo<T, F>::ZParallelOopsDo(T* iter) :
94 _iter(iter),
95 _completed(false) {}
96
97 template <typename T, void (T::*F)(OopClosure*)>
98 void ZParallelOopsDo<T, F>::oops_do(OopClosure* cl) {
99 if (!_completed) {
100 (_iter->*F)(cl);
101 if (!_completed) {
102 _completed = true;
103 }
104 }
105 }
106
107 template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
108 ZSerialWeakOopsDo<T, F>::ZSerialWeakOopsDo(T* iter) :
109 _iter(iter),
110 _claimed(false) {}
111
112 template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
113 void ZSerialWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl) {
114 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
115 (_iter->*F)(is_alive, cl);
116 }
117 }
118
119 template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
120 ZParallelWeakOopsDo<T, F>::ZParallelWeakOopsDo(T* iter) :
121 _iter(iter),
122 _completed(false) {}
123
124 template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
125 void ZParallelWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl) {
126 if (!_completed) {
127 (_iter->*F)(is_alive, cl);
128 if (!_completed) {
129 _completed = true;
130 }
131 }
132 }
133
134 ZRootsIterator::ZRootsIterator() :
135 _universe(this),
136 _object_synchronizer(this),
137 _management(this),
138 _jvmti_export(this),
139 _jvmti_weak_export(this),
140 _system_dictionary(this),
141 _threads(this),
142 _code_cache(this) {
143 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
144 ZStatTimer timer(ZSubPhasePauseRootsSetup);
145 Threads::change_thread_claim_parity();
146 ClassLoaderDataGraph::clear_claimed_marks();
147 COMPILER2_PRESENT(DerivedPointerTable::clear());
148 CodeCache::gc_prologue();
149 ZNMethodTable::gc_prologue();
150 }
151
152 ZRootsIterator::~ZRootsIterator() {
153 ZStatTimer timer(ZSubPhasePauseRootsTeardown);
154 ResourceMark rm;
155 ZNMethodTable::gc_epilogue();
156 CodeCache::gc_epilogue();
157 JvmtiExport::gc_epilogue();
158 COMPILER2_PRESENT(DerivedPointerTable::update_pointers());
159 Threads::assert_all_threads_claimed();
160 }
161
162 void ZRootsIterator::do_universe(OopClosure* cl) {
163 ZStatTimer timer(ZSubPhasePauseRootsUniverse);
164 Universe::oops_do(cl);
165 }
166
167 void ZRootsIterator::do_object_synchronizer(OopClosure* cl) {
168 ZStatTimer timer(ZSubPhasePauseRootsObjectSynchronizer);
169 ObjectSynchronizer::oops_do(cl);
170 }
171
172 void ZRootsIterator::do_management(OopClosure* cl) {
173 ZStatTimer timer(ZSubPhasePauseRootsManagement);
174 Management::oops_do(cl);
175 }
176
177 void ZRootsIterator::do_jvmti_export(OopClosure* cl) {
178 ZStatTimer timer(ZSubPhasePauseRootsJVMTIExport);
179 JvmtiExport::oops_do(cl);
180 }
181
182 void ZRootsIterator::do_jvmti_weak_export(OopClosure* cl) {
183 ZStatTimer timer(ZSubPhasePauseRootsJVMTIWeakExport);
184 AlwaysTrueClosure always_alive;
185 JvmtiExport::weak_oops_do(&always_alive, cl);
186 }
187
188 void ZRootsIterator::do_system_dictionary(OopClosure* cl) {
189 ZStatTimer timer(ZSubPhasePauseRootsSystemDictionary);
190 SystemDictionary::oops_do(cl);
191 }
192
193 class ZRootsIteratorThreadClosure : public ThreadClosure {
194 private:
195 OopClosure* const _cl;
196
197 public:
198 ZRootsIteratorThreadClosure(OopClosure* cl) :
199 _cl(cl) {}
200
201 virtual void do_thread(Thread* thread) {
202 if (thread->is_Java_thread()) {
203 // Update thread local address bad mask
204 ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask);
205 }
206
207 // Process thread oops
208 thread->oops_do(_cl, NULL);
209 }
210 };
211
212 void ZRootsIterator::do_threads(OopClosure* cl) {
213 ZStatTimer timer(ZSubPhasePauseRootsThreads);
214 ResourceMark rm;
215 ZRootsIteratorThreadClosure thread_cl(cl);
216 Threads::possibly_parallel_threads_do(true, &thread_cl);
217 }
218
219 void ZRootsIterator::do_code_cache(OopClosure* cl) {
220 ZStatTimer timer(ZSubPhasePauseRootsCodeCache);
221 ZNMethodTable::oops_do(cl);
222 }
223
224 void ZRootsIterator::oops_do(OopClosure* cl, bool visit_jvmti_weak_export) {
225 ZStatTimer timer(ZSubPhasePauseRoots);
226 _universe.oops_do(cl);
227 _object_synchronizer.oops_do(cl);
228 _management.oops_do(cl);
229 _jvmti_export.oops_do(cl);
230 _system_dictionary.oops_do(cl);
231 _threads.oops_do(cl);
232 _code_cache.oops_do(cl);
233 if (visit_jvmti_weak_export) {
234 _jvmti_weak_export.oops_do(cl);
235 }
236 }
237
238 ZConcurrentRootsIterator::ZConcurrentRootsIterator()
239 : _jni_handles_iter(JNIHandles::global_handles()),
240 _jni_handles(this),
241 _class_loader_data_graph(this) {
242 ZStatTimer timer(ZSubPhaseConcurrentRootsSetup);
243 }
244
245 ZConcurrentRootsIterator::~ZConcurrentRootsIterator() {
246 ZStatTimer timer(ZSubPhaseConcurrentRootsTeardown);
247 }
248
249 void ZConcurrentRootsIterator::do_jni_handles(OopClosure* cl) {
250 ZStatTimer timer(ZSubPhaseConcurrentRootsJNIHandles);
251 _jni_handles_iter.oops_do(cl);
252 }
253
254 void ZConcurrentRootsIterator::do_class_loader_data_graph(OopClosure* cl) {
255 ZStatTimer timer(ZSubPhaseConcurrentRootsClassLoaderDataGraph);
256 CLDToOopClosure cld_cl(cl);
257 ClassLoaderDataGraph::cld_do(&cld_cl);
258 }
259
260 void ZConcurrentRootsIterator::oops_do(OopClosure* cl) {
261 ZStatTimer timer(ZSubPhaseConcurrentRoots);
262 _jni_handles.oops_do(cl);
263 _class_loader_data_graph.oops_do(cl);
264 }
265
266 ZWeakRootsIterator::ZWeakRootsIterator() :
267 _jvmti_weak_export(this),
268 _jfr_weak(this) {
269 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
270 ZStatTimer timer(ZSubPhasePauseWeakRootsSetup);
271 StringTable::reset_dead_counter();
272 }
273
274 ZWeakRootsIterator::~ZWeakRootsIterator() {
275 ZStatTimer timer(ZSubPhasePauseWeakRootsTeardown);
276 StringTable::finish_dead_counter();
277 }
278
279 void ZWeakRootsIterator::do_jvmti_weak_export(BoolObjectClosure* is_alive, OopClosure* cl) {
280 ZStatTimer timer(ZSubPhasePauseWeakRootsJVMTIWeakExport);
281 JvmtiExport::weak_oops_do(is_alive, cl);
282 }
283
284 void ZWeakRootsIterator::do_jfr_weak(BoolObjectClosure* is_alive, OopClosure* cl) {
285 #if INCLUDE_JFR
286 ZStatTimer timer(ZSubPhasePauseWeakRootsJFRWeak);
287 Jfr::weak_oops_do(is_alive, cl);
288 #endif
289 }
290
291 void ZWeakRootsIterator::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl) {
292 ZStatTimer timer(ZSubPhasePauseWeakRoots);
293 _jvmti_weak_export.weak_oops_do(is_alive, cl);
294 _jfr_weak.weak_oops_do(is_alive, cl);
295 }
296
297 void ZWeakRootsIterator::oops_do(OopClosure* cl) {
298 AlwaysTrueClosure always_alive;
299 weak_oops_do(&always_alive, cl);
300 }
301
302 ZConcurrentWeakRootsIterator::ZConcurrentWeakRootsIterator() :
303 _vm_weak_handles_iter(SystemDictionary::vm_weak_oop_storage()),
304 _jni_weak_handles_iter(JNIHandles::weak_global_handles()),
305 _string_table_iter(StringTable::weak_storage()),
306 _vm_weak_handles(this),
307 _jni_weak_handles(this),
308 _string_table(this) {
309 StringTable::reset_dead_counter();
310 }
311
312 ZConcurrentWeakRootsIterator::~ZConcurrentWeakRootsIterator() {
313 StringTable::finish_dead_counter();
314 }
315
316 void ZConcurrentWeakRootsIterator::do_vm_weak_handles(OopClosure* cl) {
317 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsVMWeakHandles);
318 _vm_weak_handles_iter.oops_do(cl);
319 }
320
321 void ZConcurrentWeakRootsIterator::do_jni_weak_handles(OopClosure* cl) {
322 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsJNIWeakHandles);
323 _jni_weak_handles_iter.oops_do(cl);
324 }
325
326 class ZStringTableDeadCounterOopClosure : public OopClosure {
327 private:
328 OopClosure* const _cl;
329 size_t _ndead;
330
331 public:
332 ZStringTableDeadCounterOopClosure(OopClosure* cl) :
333 _cl(cl),
334 _ndead(0) {}
335
336 ~ZStringTableDeadCounterOopClosure() {
337 StringTable::inc_dead_counter(_ndead);
338 }
339
340 virtual void do_oop(oop* p) {
341 _cl->do_oop(p);
342 if (*p == NULL) {
343 _ndead++;
344 }
345 }
346
347 virtual void do_oop(narrowOop* p) {
348 ShouldNotReachHere();
349 }
350 };
351
352 void ZConcurrentWeakRootsIterator::do_string_table(OopClosure* cl) {
353 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsStringTable);
354 ZStringTableDeadCounterOopClosure counter_cl(cl);
355 _string_table_iter.oops_do(&counter_cl);
356 }
357
358 void ZConcurrentWeakRootsIterator::oops_do(OopClosure* cl) {
359 ZStatTimer timer(ZSubPhaseConcurrentWeakRoots);
360 _vm_weak_handles.oops_do(cl);
361 _jni_weak_handles.oops_do(cl);
362 _string_table.oops_do(cl);
363 }
364
365 ZThreadRootsIterator::ZThreadRootsIterator() :
366 _threads(this) {
367 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
368 ZStatTimer timer(ZSubPhasePauseRootsSetup);
369 Threads::change_thread_claim_parity();
370 }
371
372 ZThreadRootsIterator::~ZThreadRootsIterator() {
373 ZStatTimer timer(ZSubPhasePauseRootsTeardown);
374 Threads::assert_all_threads_claimed();
375 }
376
377 void ZThreadRootsIterator::do_threads(OopClosure* cl) {
378 ZStatTimer timer(ZSubPhasePauseRootsThreads);
379 ResourceMark rm;
380 Threads::possibly_parallel_oops_do(true, cl, NULL);
381 }
382
383 void ZThreadRootsIterator::oops_do(OopClosure* cl) {
384 ZStatTimer timer(ZSubPhasePauseRoots);
385 _threads.oops_do(cl);
386 }