1 /*
2 * Copyright (c) 2015, 2019, 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/classLoaderDataGraph.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/barrierSet.hpp"
31 #include "gc/shared/barrierSetNMethod.hpp"
32 #include "gc/shared/oopStorageParState.inline.hpp"
33 #include "gc/shared/oopStorageSet.hpp"
34 #include "gc/shared/suspendibleThreadSet.hpp"
35 #include "gc/z/zBarrierSetNMethod.hpp"
36 #include "gc/z/zGlobals.hpp"
37 #include "gc/z/zNMethod.hpp"
38 #include "gc/z/zOopClosures.inline.hpp"
39 #include "gc/z/zRootsIterator.hpp"
40 #include "gc/z/zStat.hpp"
41 #include "gc/z/zThreadLocalData.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "prims/jvmtiExport.hpp"
45 #include "prims/resolvedMethodTable.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/thread.hpp"
48 #include "runtime/safepoint.hpp"
49 #include "runtime/synchronizer.hpp"
50 #include "services/management.hpp"
51 #include "utilities/debug.hpp"
52 #if INCLUDE_JFR
53 #include "jfr/jfr.hpp"
54 #endif
55
56 static const ZStatSubPhase ZSubPhasePauseRootsSetup("Pause Roots Setup");
57 static const ZStatSubPhase ZSubPhasePauseRoots("Pause Roots");
58 static const ZStatSubPhase ZSubPhasePauseRootsTeardown("Pause Roots Teardown");
59 static const ZStatSubPhase ZSubPhasePauseRootsUniverse("Pause Roots Universe");
60 static const ZStatSubPhase ZSubPhasePauseRootsObjectSynchronizer("Pause Roots ObjectSynchronizer");
61 static const ZStatSubPhase ZSubPhasePauseRootsManagement("Pause Roots Management");
62 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIExport("Pause Roots JVMTIExport");
63 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIWeakExport("Pause Roots JVMTIWeakExport");
64 static const ZStatSubPhase ZSubPhasePauseRootsSystemDictionary("Pause Roots SystemDictionary");
65 static const ZStatSubPhase ZSubPhasePauseRootsThreads("Pause Roots Threads");
66 static const ZStatSubPhase ZSubPhasePauseRootsCodeCache("Pause Roots CodeCache");
67
68 static const ZStatSubPhase ZSubPhaseConcurrentRootsSetup("Concurrent Roots Setup");
69 static const ZStatSubPhase ZSubPhaseConcurrentRoots("Concurrent Roots");
70 static const ZStatSubPhase ZSubPhaseConcurrentRootsTeardown("Concurrent Roots Teardown");
71 static const ZStatSubPhase ZSubPhaseConcurrentRootsJNIHandles("Concurrent Roots JNIHandles");
72 static const ZStatSubPhase ZSubPhaseConcurrentRootsVMHandles("Concurrent Roots VMHandles");
73 static const ZStatSubPhase ZSubPhaseConcurrentRootsClassLoaderDataGraph("Concurrent Roots ClassLoaderDataGraph");
74
75 static const ZStatSubPhase ZSubPhasePauseWeakRootsSetup("Pause Weak Roots Setup");
76 static const ZStatSubPhase ZSubPhasePauseWeakRoots("Pause Weak Roots");
77 static const ZStatSubPhase ZSubPhasePauseWeakRootsTeardown("Pause Weak Roots Teardown");
78 static const ZStatSubPhase ZSubPhasePauseWeakRootsJVMTIWeakExport("Pause Weak Roots JVMTIWeakExport");
79 static const ZStatSubPhase ZSubPhasePauseWeakRootsJFRWeak("Pause Weak Roots JFRWeak");
80
81 static const ZStatSubPhase ZSubPhaseConcurrentWeakRoots("Concurrent Weak Roots");
82 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsVMWeakHandles("Concurrent Weak Roots VMWeakHandles");
83 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsJNIWeakHandles("Concurrent Weak Roots JNIWeakHandles");
84 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsStringTable("Concurrent Weak Roots StringTable");
85 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsResolvedMethodTable("Concurrent Weak Roots ResolvedMethodTable");
86
87 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
88 ZSerialOopsDo<T, F>::ZSerialOopsDo(T* iter) :
89 _iter(iter),
90 _claimed(false) {}
91
92 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
93 void ZSerialOopsDo<T, F>::oops_do(ZRootsIteratorClosure* cl) {
94 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
95 (_iter->*F)(cl);
96 }
97 }
98
99 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
100 ZParallelOopsDo<T, F>::ZParallelOopsDo(T* iter) :
101 _iter(iter),
102 _completed(false) {}
103
104 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
105 void ZParallelOopsDo<T, F>::oops_do(ZRootsIteratorClosure* cl) {
106 if (!_completed) {
107 (_iter->*F)(cl);
108 if (!_completed) {
109 _completed = true;
110 }
111 }
112 }
113
114 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
115 ZSerialWeakOopsDo<T, F>::ZSerialWeakOopsDo(T* iter) :
116 _iter(iter),
117 _claimed(false) {}
118
119 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
120 void ZSerialWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
121 if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
122 (_iter->*F)(is_alive, cl);
123 }
124 }
125
126 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
127 ZParallelWeakOopsDo<T, F>::ZParallelWeakOopsDo(T* iter) :
128 _iter(iter),
129 _completed(false) {}
130
131 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
132 void ZParallelWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
133 if (!_completed) {
134 (_iter->*F)(is_alive, cl);
135 if (!_completed) {
136 _completed = true;
137 }
138 }
139 }
140
141 class ZRootsIteratorCodeBlobClosure : public CodeBlobToOopClosure {
142 private:
143 BarrierSetNMethod* const _bs;
144 const bool _disarm_nmethods;
145
146 public:
147 ZRootsIteratorCodeBlobClosure(OopClosure* cl, bool disarm_nmethods) :
148 CodeBlobToOopClosure(cl, true /* fix_relocations */),
149 _bs(BarrierSet::barrier_set()->barrier_set_nmethod()),
150 _disarm_nmethods(disarm_nmethods) {}
151
152 virtual void do_code_blob(CodeBlob* cb) {
153 nmethod* const nm = cb->as_nmethod_or_null();
154 if (nm != NULL && nm->oops_do_try_claim()) {
155 CodeBlobToOopClosure::do_code_blob(cb);
156 if (_disarm_nmethods) {
157 _bs->disarm(nm);
158 }
159 }
160 }
161 };
162
163 class ZRootsIteratorThreadClosure : public ThreadClosure {
164 private:
165 ZRootsIteratorClosure* const _cl;
166 const bool _disarm_nmethods;
167
168 public:
169 ZRootsIteratorThreadClosure(ZRootsIteratorClosure* cl, bool disarm_nmethods) :
170 _cl(cl),
171 _disarm_nmethods(disarm_nmethods) {}
172
173 virtual void do_thread(Thread* thread) {
174 ZRootsIteratorCodeBlobClosure code_cl(_cl, _disarm_nmethods);
175 thread->oops_do(_cl, ClassUnloading ? &code_cl : NULL);
176 _cl->do_thread(thread);
177 }
178 };
179
180 ZRootsIterator::ZRootsIterator(bool visit_jvmti_weak_export, bool disarm_nmethods) :
181 _visit_jvmti_weak_export(visit_jvmti_weak_export),
182 _disarm_nmethods(disarm_nmethods),
183 _universe(this),
184 _object_synchronizer(this),
185 _management(this),
186 _jvmti_export(this),
187 _jvmti_weak_export(this),
188 _system_dictionary(this),
189 _threads(this),
190 _code_cache(this) {
191 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
192 ZStatTimer timer(ZSubPhasePauseRootsSetup);
193 Threads::change_thread_claim_token();
194 COMPILER2_PRESENT(DerivedPointerTable::clear());
195 if (ClassUnloading) {
196 nmethod::oops_do_marking_prologue();
197 } else {
198 ZNMethod::oops_do_begin();
199 }
200 }
201
202 ZRootsIterator::~ZRootsIterator() {
203 ZStatTimer timer(ZSubPhasePauseRootsTeardown);
204 ResourceMark rm;
205 if (ClassUnloading) {
206 nmethod::oops_do_marking_epilogue();
207 } else {
208 ZNMethod::oops_do_end();
209 }
210
211 COMPILER2_PRESENT(DerivedPointerTable::update_pointers());
212 Threads::assert_all_threads_claimed();
213 }
214
215 void ZRootsIterator::do_universe(ZRootsIteratorClosure* cl) {
216 ZStatTimer timer(ZSubPhasePauseRootsUniverse);
217 Universe::oops_do(cl);
218 }
219
220 void ZRootsIterator::do_object_synchronizer(ZRootsIteratorClosure* cl) {
221 ZStatTimer timer(ZSubPhasePauseRootsObjectSynchronizer);
222 ObjectSynchronizer::oops_do(cl);
223 }
224
225 void ZRootsIterator::do_management(ZRootsIteratorClosure* cl) {
226 ZStatTimer timer(ZSubPhasePauseRootsManagement);
227 Management::oops_do(cl);
228 }
229
230 void ZRootsIterator::do_jvmti_export(ZRootsIteratorClosure* cl) {
231 ZStatTimer timer(ZSubPhasePauseRootsJVMTIExport);
232 JvmtiExport::oops_do(cl);
233 }
234
235 void ZRootsIterator::do_jvmti_weak_export(ZRootsIteratorClosure* cl) {
236 ZStatTimer timer(ZSubPhasePauseRootsJVMTIWeakExport);
237 AlwaysTrueClosure always_alive;
238 JvmtiExport::weak_oops_do(&always_alive, cl);
239 }
240
241 void ZRootsIterator::do_system_dictionary(ZRootsIteratorClosure* cl) {
242 ZStatTimer timer(ZSubPhasePauseRootsSystemDictionary);
243 // Handles are processed via _vm_handles.
244 SystemDictionary::oops_do(cl, false /* include_handles */);
245 }
246
247 void ZRootsIterator::do_threads(ZRootsIteratorClosure* cl) {
248 ZStatTimer timer(ZSubPhasePauseRootsThreads);
249 ResourceMark rm;
250 ZRootsIteratorThreadClosure thread_cl(cl, _disarm_nmethods);
251 Threads::possibly_parallel_threads_do(true, &thread_cl);
252 }
253
254 void ZRootsIterator::do_code_cache(ZRootsIteratorClosure* cl) {
255 ZStatTimer timer(ZSubPhasePauseRootsCodeCache);
256 ZNMethod::oops_do(cl);
257 }
258
259 void ZRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
260 ZStatTimer timer(ZSubPhasePauseRoots);
261 _universe.oops_do(cl);
262 _object_synchronizer.oops_do(cl);
263 _management.oops_do(cl);
264 _jvmti_export.oops_do(cl);
265 _system_dictionary.oops_do(cl);
266 _threads.oops_do(cl);
267 if (!ClassUnloading) {
268 _code_cache.oops_do(cl);
269 }
270 if (_visit_jvmti_weak_export) {
271 _jvmti_weak_export.oops_do(cl);
272 }
273 }
274
275 ZConcurrentRootsIterator::ZConcurrentRootsIterator(int cld_claim) :
276 _jni_handles_iter(OopStorageSet::jni_global()),
277 _vm_handles_iter(OopStorageSet::vm_global()),
278 _cld_claim(cld_claim),
279 _jni_handles(this),
280 _vm_handles(this),
281 _class_loader_data_graph(this) {
282 ZStatTimer timer(ZSubPhaseConcurrentRootsSetup);
283 ClassLoaderDataGraph::clear_claimed_marks(cld_claim);
284 }
285
286 ZConcurrentRootsIterator::~ZConcurrentRootsIterator() {
287 ZStatTimer timer(ZSubPhaseConcurrentRootsTeardown);
288 }
289
290 void ZConcurrentRootsIterator::do_jni_handles(ZRootsIteratorClosure* cl) {
291 ZStatTimer timer(ZSubPhaseConcurrentRootsJNIHandles);
292 _jni_handles_iter.oops_do(cl);
293 }
294
295 void ZConcurrentRootsIterator::do_vm_handles(ZRootsIteratorClosure* cl) {
296 ZStatTimer timer(ZSubPhaseConcurrentRootsVMHandles);
297 _vm_handles_iter.oops_do(cl);
298 }
299
300 void ZConcurrentRootsIterator::do_class_loader_data_graph(ZRootsIteratorClosure* cl) {
301 ZStatTimer timer(ZSubPhaseConcurrentRootsClassLoaderDataGraph);
302 CLDToOopClosure cld_cl(cl, _cld_claim);
303 ClassLoaderDataGraph::always_strong_cld_do(&cld_cl);
304 }
305
306 void ZConcurrentRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
307 ZStatTimer timer(ZSubPhaseConcurrentRoots);
308 _jni_handles.oops_do(cl);
309 _vm_handles.oops_do(cl),
310 _class_loader_data_graph.oops_do(cl);
311 }
312
313 ZWeakRootsIterator::ZWeakRootsIterator() :
314 _jvmti_weak_export(this),
315 _jfr_weak(this) {
316 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
317 ZStatTimer timer(ZSubPhasePauseWeakRootsSetup);
318 }
319
320 ZWeakRootsIterator::~ZWeakRootsIterator() {
321 ZStatTimer timer(ZSubPhasePauseWeakRootsTeardown);
322 }
323
324 void ZWeakRootsIterator::do_jvmti_weak_export(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
325 ZStatTimer timer(ZSubPhasePauseWeakRootsJVMTIWeakExport);
326 JvmtiExport::weak_oops_do(is_alive, cl);
327 }
328
329 void ZWeakRootsIterator::do_jfr_weak(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
330 #if INCLUDE_JFR
331 ZStatTimer timer(ZSubPhasePauseWeakRootsJFRWeak);
332 Jfr::weak_oops_do(is_alive, cl);
333 #endif
334 }
335
336 void ZWeakRootsIterator::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
337 ZStatTimer timer(ZSubPhasePauseWeakRoots);
338 _jvmti_weak_export.weak_oops_do(is_alive, cl);
339 _jfr_weak.weak_oops_do(is_alive, cl);
340 }
341
342 void ZWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
343 AlwaysTrueClosure always_alive;
344 weak_oops_do(&always_alive, cl);
345 }
346
347 ZConcurrentWeakRootsIterator::ZConcurrentWeakRootsIterator() :
348 _vm_weak_handles_iter(OopStorageSet::vm_weak()),
349 _jni_weak_handles_iter(OopStorageSet::jni_weak()),
350 _string_table_iter(OopStorageSet::string_table_weak()),
351 _resolved_method_table_iter(OopStorageSet::resolved_method_table_weak()),
352 _vm_weak_handles(this),
353 _jni_weak_handles(this),
354 _string_table(this),
355 _resolved_method_table(this) {
356 StringTable::reset_dead_counter();
357 ResolvedMethodTable::reset_dead_counter();
358 }
359
360 ZConcurrentWeakRootsIterator::~ZConcurrentWeakRootsIterator() {
361 StringTable::finish_dead_counter();
362 ResolvedMethodTable::finish_dead_counter();
363 }
364
365 void ZConcurrentWeakRootsIterator::do_vm_weak_handles(ZRootsIteratorClosure* cl) {
366 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsVMWeakHandles);
367 _vm_weak_handles_iter.oops_do(cl);
368 }
369
370 void ZConcurrentWeakRootsIterator::do_jni_weak_handles(ZRootsIteratorClosure* cl) {
371 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsJNIWeakHandles);
372 _jni_weak_handles_iter.oops_do(cl);
373 }
374
375 template <class Container>
376 class ZDeadCounterClosure : public ZRootsIteratorClosure {
377 private:
378 ZRootsIteratorClosure* const _cl;
379 size_t _ndead;
380
381 public:
382 ZDeadCounterClosure(ZRootsIteratorClosure* cl) :
383 _cl(cl),
384 _ndead(0) {}
385
386 ~ZDeadCounterClosure() {
387 Container::inc_dead_counter(_ndead);
388 }
389
390 virtual void do_oop(oop* p) {
391 _cl->do_oop(p);
392 if (*p == NULL) {
393 _ndead++;
394 }
395 }
396
397 virtual void do_oop(narrowOop* p) {
398 ShouldNotReachHere();
399 }
400 };
401
402 void ZConcurrentWeakRootsIterator::do_string_table(ZRootsIteratorClosure* cl) {
403 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsStringTable);
404 ZDeadCounterClosure<StringTable> counter_cl(cl);
405 _string_table_iter.oops_do(&counter_cl);
406 }
407
408 void ZConcurrentWeakRootsIterator::do_resolved_method_table(ZRootsIteratorClosure* cl) {
409 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsResolvedMethodTable);
410 ZDeadCounterClosure<ResolvedMethodTable> counter_cl(cl);
411 _resolved_method_table_iter.oops_do(&counter_cl);
412 }
413
414 void ZConcurrentWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
415 ZStatTimer timer(ZSubPhaseConcurrentWeakRoots);
416 _vm_weak_handles.oops_do(cl);
417 _jni_weak_handles.oops_do(cl);
418 _string_table.oops_do(cl);
419 _resolved_method_table.oops_do(cl);
420 }