1 /*
2 * Copyright (c) 2015, 2020, 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 "code/codeCache.hpp"
28 #include "compiler/oopMap.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shared/barrierSetNMethod.hpp"
31 #include "gc/shared/oopStorageSet.hpp"
32 #include "gc/shared/oopStorageParState.inline.hpp"
33 #include "gc/shared/oopStorageSetParState.inline.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/iterator.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "prims/resolvedMethodTable.hpp"
47 #include "runtime/atomic.hpp"
48 #include "runtime/safepoint.hpp"
49 #include "runtime/synchronizer.hpp"
50 #include "runtime/thread.hpp"
51 #include "runtime/vmThread.hpp"
52 #include "services/management.hpp"
53 #include "utilities/debug.hpp"
54 #if INCLUDE_JFR
55 #include "jfr/jfr.hpp"
56 #endif
57
58 static const ZStatSubPhase ZSubPhasePauseRootsSetup("Pause Roots Setup");
59 static const ZStatSubPhase ZSubPhasePauseRoots("Pause Roots");
60 static const ZStatSubPhase ZSubPhasePauseRootsTeardown("Pause Roots Teardown");
61 static const ZStatSubPhase ZSubPhasePauseRootsUniverse("Pause Roots Universe");
62 static const ZStatSubPhase ZSubPhasePauseRootsObjectSynchronizer("Pause Roots ObjectSynchronizer");
63 static const ZStatSubPhase ZSubPhasePauseRootsManagement("Pause Roots Management");
64 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIExport("Pause Roots JVMTIExport");
65 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIWeakExport("Pause Roots JVMTIWeakExport");
66 static const ZStatSubPhase ZSubPhasePauseRootsVMThread("Pause Roots VM Thread");
67 static const ZStatSubPhase ZSubPhasePauseRootsJavaThreads("Pause Roots Java Threads");
68 static const ZStatSubPhase ZSubPhasePauseRootsCodeCache("Pause Roots CodeCache");
69
70 static const ZStatSubPhase ZSubPhaseConcurrentRootsSetup("Concurrent Roots Setup");
71 static const ZStatSubPhase ZSubPhaseConcurrentRoots("Concurrent Roots");
72 static const ZStatSubPhase ZSubPhaseConcurrentRootsTeardown("Concurrent Roots Teardown");
73 static const ZStatSubPhase ZSubPhaseConcurrentRootsOopStorageSet("Concurrent Roots OopStorageSet");
74 static const ZStatSubPhase ZSubPhaseConcurrentRootsClassLoaderDataGraph("Concurrent Roots ClassLoaderDataGraph");
75
76 static const ZStatSubPhase ZSubPhasePauseWeakRootsSetup("Pause Weak Roots Setup");
77 static const ZStatSubPhase ZSubPhasePauseWeakRoots("Pause Weak Roots");
78 static const ZStatSubPhase ZSubPhasePauseWeakRootsTeardown("Pause Weak Roots Teardown");
79 static const ZStatSubPhase ZSubPhasePauseWeakRootsJVMTIWeakExport("Pause Weak Roots JVMTIWeakExport");
80 static const ZStatSubPhase ZSubPhasePauseWeakRootsJFRWeak("Pause Weak Roots JFRWeak");
81
82 static const ZStatSubPhase ZSubPhaseConcurrentWeakRoots("Concurrent Weak Roots");
83 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsVMWeakHandles("Concurrent Weak Roots VMWeakHandles");
84 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsJNIWeakHandles("Concurrent Weak Roots JNIWeakHandles");
85 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsStringTable("Concurrent Weak Roots StringTable");
86 static const ZStatSubPhase ZSubPhaseConcurrentWeakRootsResolvedMethodTable("Concurrent Weak Roots ResolvedMethodTable");
87
88 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
89 ZSerialOopsDo<T, F>::ZSerialOopsDo(T* iter) :
90 _iter(iter),
91 _claimed(false) {}
92
93 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
94 void ZSerialOopsDo<T, F>::oops_do(ZRootsIteratorClosure* cl) {
95 if (!_claimed && Atomic::cmpxchg(&_claimed, false, true) == false) {
96 (_iter->*F)(cl);
97 }
98 }
99
100 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
101 ZParallelOopsDo<T, F>::ZParallelOopsDo(T* iter) :
102 _iter(iter),
103 _completed(false) {}
104
105 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
106 void ZParallelOopsDo<T, F>::oops_do(ZRootsIteratorClosure* cl) {
107 if (!_completed) {
108 (_iter->*F)(cl);
109 if (!_completed) {
110 _completed = true;
111 }
112 }
113 }
114
115 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
116 ZSerialWeakOopsDo<T, F>::ZSerialWeakOopsDo(T* iter) :
117 _iter(iter),
118 _claimed(false) {}
119
120 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
121 void ZSerialWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
122 if (!_claimed && Atomic::cmpxchg(&_claimed, false, true) == false) {
123 (_iter->*F)(is_alive, cl);
124 }
125 }
126
127 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
128 ZParallelWeakOopsDo<T, F>::ZParallelWeakOopsDo(T* iter) :
129 _iter(iter),
130 _completed(false) {}
131
132 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
133 void ZParallelWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
134 if (!_completed) {
135 (_iter->*F)(is_alive, cl);
136 if (!_completed) {
137 _completed = true;
138 }
139 }
140 }
141
142 class ZRootsIteratorCodeBlobClosure : public CodeBlobClosure {
143 private:
144 ZRootsIteratorClosure* const _cl;
145 const bool _should_disarm_nmethods;
146
147 public:
148 ZRootsIteratorCodeBlobClosure(ZRootsIteratorClosure* cl) :
149 _cl(cl),
150 _should_disarm_nmethods(cl->should_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 ZNMethod::nmethod_oops_do(nm, _cl);
156 assert(!ZNMethod::supports_entry_barrier(nm) ||
157 ZNMethod::is_armed(nm) == _should_disarm_nmethods, "Invalid state");
158 if (_should_disarm_nmethods) {
159 ZNMethod::disarm(nm);
160 }
161 }
162 }
163 };
164
165 class ZRootsIteratorThreadClosure : public ThreadClosure {
166 private:
167 ZRootsIteratorClosure* const _cl;
168 ResourceMark _rm;
169
170 public:
171 ZRootsIteratorThreadClosure(ZRootsIteratorClosure* cl) :
172 _cl(cl) {}
173
174 virtual void do_thread(Thread* thread) {
175 ZRootsIteratorCodeBlobClosure code_cl(_cl);
176 thread->oops_do(_cl, ClassUnloading ? &code_cl : NULL);
177 _cl->do_thread(thread);
178 }
179 };
180
181 ZJavaThreadsIterator::ZJavaThreadsIterator() :
182 _threads(),
183 _claimed(0) {}
184
185 uint ZJavaThreadsIterator::claim() {
186 return Atomic::fetch_and_add(&_claimed, 1u);
187 }
188
189 void ZJavaThreadsIterator::threads_do(ThreadClosure* cl) {
190 for (uint i = claim(); i < _threads.length(); i = claim()) {
191 cl->do_thread(_threads.thread_at(i));
192 }
193 }
194
195 ZRootsIterator::ZRootsIterator(bool visit_jvmti_weak_export) :
196 _visit_jvmti_weak_export(visit_jvmti_weak_export),
197 _java_threads_iter(),
198 _universe(this),
199 _object_synchronizer(this),
200 _management(this),
201 _jvmti_export(this),
202 _jvmti_weak_export(this),
203 _vm_thread(this),
204 _java_threads(this),
205 _code_cache(this) {
206 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
207 ZStatTimer timer(ZSubPhasePauseRootsSetup);
208 COMPILER2_OR_JVMCI_PRESENT(DerivedPointerTable::clear());
209 if (ClassUnloading) {
210 nmethod::oops_do_marking_prologue();
211 } else {
212 ZNMethod::oops_do_begin();
213 }
214 }
215
216 ZRootsIterator::~ZRootsIterator() {
217 ZStatTimer timer(ZSubPhasePauseRootsTeardown);
218 ResourceMark rm;
219 if (ClassUnloading) {
220 nmethod::oops_do_marking_epilogue();
221 } else {
222 ZNMethod::oops_do_end();
223 }
224
225 COMPILER2_OR_JVMCI_PRESENT(DerivedPointerTable::update_pointers());
226 }
227
228 void ZRootsIterator::do_universe(ZRootsIteratorClosure* cl) {
229 ZStatTimer timer(ZSubPhasePauseRootsUniverse);
230 Universe::oops_do(cl);
231 }
232
233 void ZRootsIterator::do_object_synchronizer(ZRootsIteratorClosure* cl) {
234 ZStatTimer timer(ZSubPhasePauseRootsObjectSynchronizer);
235 ObjectSynchronizer::oops_do(cl);
236 }
237
238 void ZRootsIterator::do_management(ZRootsIteratorClosure* cl) {
239 ZStatTimer timer(ZSubPhasePauseRootsManagement);
240 Management::oops_do(cl);
241 }
242
243 void ZRootsIterator::do_jvmti_export(ZRootsIteratorClosure* cl) {
244 ZStatTimer timer(ZSubPhasePauseRootsJVMTIExport);
245 JvmtiExport::oops_do(cl);
246 }
247
248 void ZRootsIterator::do_jvmti_weak_export(ZRootsIteratorClosure* cl) {
249 ZStatTimer timer(ZSubPhasePauseRootsJVMTIWeakExport);
250 AlwaysTrueClosure always_alive;
251 JvmtiExport::weak_oops_do(&always_alive, cl);
252 }
253
254 void ZRootsIterator::do_vm_thread(ZRootsIteratorClosure* cl) {
255 ZStatTimer timer(ZSubPhasePauseRootsVMThread);
256 ZRootsIteratorThreadClosure thread_cl(cl);
257 thread_cl.do_thread(VMThread::vm_thread());
258 }
259
260 void ZRootsIterator::do_java_threads(ZRootsIteratorClosure* cl) {
261 ZStatTimer timer(ZSubPhasePauseRootsJavaThreads);
262 ZRootsIteratorThreadClosure thread_cl(cl);
263 _java_threads_iter.threads_do(&thread_cl);
264 }
265
266 void ZRootsIterator::do_code_cache(ZRootsIteratorClosure* cl) {
267 ZStatTimer timer(ZSubPhasePauseRootsCodeCache);
268 ZNMethod::oops_do(cl);
269 }
270
271 void ZRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
272 ZStatTimer timer(ZSubPhasePauseRoots);
273 _universe.oops_do(cl);
274 _object_synchronizer.oops_do(cl);
275 _management.oops_do(cl);
276 _jvmti_export.oops_do(cl);
277 _vm_thread.oops_do(cl);
278 _java_threads.oops_do(cl);
279 if (!ClassUnloading) {
280 _code_cache.oops_do(cl);
281 }
282 if (_visit_jvmti_weak_export) {
283 _jvmti_weak_export.oops_do(cl);
284 }
285 }
286
287 ZConcurrentRootsIterator::ZConcurrentRootsIterator(int cld_claim) :
288 _oop_storage_set_iter(),
289 _cld_claim(cld_claim),
290 _oop_storage_set(this),
291 _class_loader_data_graph(this) {
292 ZStatTimer timer(ZSubPhaseConcurrentRootsSetup);
293 ClassLoaderDataGraph::clear_claimed_marks(cld_claim);
294 }
295
296 ZConcurrentRootsIterator::~ZConcurrentRootsIterator() {
297 ZStatTimer timer(ZSubPhaseConcurrentRootsTeardown);
298 }
299
300 void ZConcurrentRootsIterator::do_oop_storage_set(ZRootsIteratorClosure* cl) {
301 ZStatTimer timer(ZSubPhaseConcurrentRootsOopStorageSet);
302 _oop_storage_set_iter.oops_do(cl);
303 }
304
305 void ZConcurrentRootsIterator::do_class_loader_data_graph(ZRootsIteratorClosure* cl) {
306 ZStatTimer timer(ZSubPhaseConcurrentRootsClassLoaderDataGraph);
307 CLDToOopClosure cld_cl(cl, _cld_claim);
308 ClassLoaderDataGraph::always_strong_cld_do(&cld_cl);
309 }
310
311 void ZConcurrentRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
312 ZStatTimer timer(ZSubPhaseConcurrentRoots);
313 _oop_storage_set.oops_do(cl);
314 _class_loader_data_graph.oops_do(cl);
315 }
316
317 ZWeakRootsIterator::ZWeakRootsIterator() :
318 _jvmti_weak_export(this),
319 _jfr_weak(this) {
320 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
321 ZStatTimer timer(ZSubPhasePauseWeakRootsSetup);
322 }
323
324 ZWeakRootsIterator::~ZWeakRootsIterator() {
325 ZStatTimer timer(ZSubPhasePauseWeakRootsTeardown);
326 }
327
328 void ZWeakRootsIterator::do_jvmti_weak_export(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
329 ZStatTimer timer(ZSubPhasePauseWeakRootsJVMTIWeakExport);
330 JvmtiExport::weak_oops_do(is_alive, cl);
331 }
332
333 void ZWeakRootsIterator::do_jfr_weak(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
334 #if INCLUDE_JFR
335 ZStatTimer timer(ZSubPhasePauseWeakRootsJFRWeak);
336 Jfr::weak_oops_do(is_alive, cl);
337 #endif
338 }
339
340 void ZWeakRootsIterator::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
341 ZStatTimer timer(ZSubPhasePauseWeakRoots);
342 _jvmti_weak_export.weak_oops_do(is_alive, cl);
343 _jfr_weak.weak_oops_do(is_alive, cl);
344 }
345
346 void ZWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
347 AlwaysTrueClosure always_alive;
348 weak_oops_do(&always_alive, cl);
349 }
350
351 ZConcurrentWeakRootsIterator::ZConcurrentWeakRootsIterator() :
352 _vm_weak_handles_iter(OopStorageSet::vm_weak()),
353 _jni_weak_handles_iter(OopStorageSet::jni_weak()),
354 _string_table_iter(OopStorageSet::string_table_weak()),
355 _resolved_method_table_iter(OopStorageSet::resolved_method_table_weak()),
356 _vm_weak_handles(this),
357 _jni_weak_handles(this),
358 _string_table(this),
359 _resolved_method_table(this) {
360 StringTable::reset_dead_counter();
361 ResolvedMethodTable::reset_dead_counter();
362 }
363
364 ZConcurrentWeakRootsIterator::~ZConcurrentWeakRootsIterator() {
365 StringTable::finish_dead_counter();
366 ResolvedMethodTable::finish_dead_counter();
367 }
368
369 void ZConcurrentWeakRootsIterator::do_vm_weak_handles(ZRootsIteratorClosure* cl) {
370 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsVMWeakHandles);
371 _vm_weak_handles_iter.oops_do(cl);
372 }
373
374 void ZConcurrentWeakRootsIterator::do_jni_weak_handles(ZRootsIteratorClosure* cl) {
375 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsJNIWeakHandles);
376 _jni_weak_handles_iter.oops_do(cl);
377 }
378
379 template <class Container>
380 class ZDeadCounterClosure : public ZRootsIteratorClosure {
381 private:
382 ZRootsIteratorClosure* const _cl;
383 size_t _ndead;
384
385 public:
386 ZDeadCounterClosure(ZRootsIteratorClosure* cl) :
387 _cl(cl),
388 _ndead(0) {}
389
390 ~ZDeadCounterClosure() {
391 Container::inc_dead_counter(_ndead);
392 }
393
394 virtual void do_oop(oop* p) {
395 _cl->do_oop(p);
396 if (*p == NULL) {
397 _ndead++;
398 }
399 }
400
401 virtual void do_oop(narrowOop* p) {
402 ShouldNotReachHere();
403 }
404 };
405
406 void ZConcurrentWeakRootsIterator::do_string_table(ZRootsIteratorClosure* cl) {
407 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsStringTable);
408 ZDeadCounterClosure<StringTable> counter_cl(cl);
409 _string_table_iter.oops_do(&counter_cl);
410 }
411
412 void ZConcurrentWeakRootsIterator::do_resolved_method_table(ZRootsIteratorClosure* cl) {
413 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsResolvedMethodTable);
414 ZDeadCounterClosure<ResolvedMethodTable> counter_cl(cl);
415 _resolved_method_table_iter.oops_do(&counter_cl);
416 }
417
418 void ZConcurrentWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
419 ZStatTimer timer(ZSubPhaseConcurrentWeakRoots);
420 _vm_weak_handles.oops_do(cl);
421 _jni_weak_handles.oops_do(cl);
422 _string_table.oops_do(cl);
423 _resolved_method_table.oops_do(cl);
424 }