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* _bs;
144
145 public:
146 ZRootsIteratorCodeBlobClosure(OopClosure* cl) :
147 CodeBlobToOopClosure(cl, true /* fix_relocations */),
148 _bs(BarrierSet::barrier_set()->barrier_set_nmethod()) {}
149
150 virtual void do_code_blob(CodeBlob* cb) {
151 nmethod* const nm = cb->as_nmethod_or_null();
152 if (nm != NULL && !nm->test_set_oops_do_mark()) {
153 CodeBlobToOopClosure::do_code_blob(cb);
154 _bs->disarm(nm);
155 }
156 }
157 };
158
159 class ZRootsIteratorThreadClosure : public ThreadClosure {
160 private:
161 ZRootsIteratorClosure* _cl;
162 const bool _visit_invisible;
163
164 public:
165 ZRootsIteratorThreadClosure(ZRootsIteratorClosure* cl, bool visit_invisible) :
166 _cl(cl),
167 _visit_invisible(visit_invisible) {}
168
169 virtual void do_thread(Thread* thread) {
170 ZRootsIteratorCodeBlobClosure code_cl(_cl);
171 thread->oops_do(_cl, ClassUnloading ? &code_cl : NULL);
172 _cl->do_thread(thread);
173 if (_visit_invisible && ZThreadLocalData::has_invisible_root(thread)) {
174 _cl->do_oop(ZThreadLocalData::invisible_root(thread));
175 }
176 }
177 };
178
179 ZRootsIterator::ZRootsIterator(bool visit_invisible, bool visit_jvmti_weak_export) :
180 _visit_invisible(visit_invisible),
181 _visit_jvmti_weak_export(visit_jvmti_weak_export),
182 _universe(this),
183 _object_synchronizer(this),
184 _management(this),
185 _jvmti_export(this),
186 _jvmti_weak_export(this),
187 _system_dictionary(this),
188 _threads(this),
189 _code_cache(this) {
190 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
191 ZStatTimer timer(ZSubPhasePauseRootsSetup);
192 Threads::change_thread_claim_token();
193 COMPILER2_PRESENT(DerivedPointerTable::clear());
194 if (ClassUnloading) {
195 nmethod::oops_do_marking_prologue();
196 } else {
197 ZNMethod::oops_do_begin();
198 }
199 }
200
201 ZRootsIterator::~ZRootsIterator() {
202 ZStatTimer timer(ZSubPhasePauseRootsTeardown);
203 ResourceMark rm;
204 if (ClassUnloading) {
205 nmethod::oops_do_marking_epilogue();
206 } else {
207 ZNMethod::oops_do_end();
208 }
209
210 COMPILER2_PRESENT(DerivedPointerTable::update_pointers());
211 Threads::assert_all_threads_claimed();
212 }
213
214 void ZRootsIterator::do_universe(ZRootsIteratorClosure* cl) {
215 ZStatTimer timer(ZSubPhasePauseRootsUniverse);
216 Universe::oops_do(cl);
217 }
218
219 void ZRootsIterator::do_object_synchronizer(ZRootsIteratorClosure* cl) {
220 ZStatTimer timer(ZSubPhasePauseRootsObjectSynchronizer);
221 ObjectSynchronizer::oops_do(cl);
222 }
223
224 void ZRootsIterator::do_management(ZRootsIteratorClosure* cl) {
225 ZStatTimer timer(ZSubPhasePauseRootsManagement);
226 Management::oops_do(cl);
227 }
228
229 void ZRootsIterator::do_jvmti_export(ZRootsIteratorClosure* cl) {
230 ZStatTimer timer(ZSubPhasePauseRootsJVMTIExport);
231 JvmtiExport::oops_do(cl);
232 }
233
234 void ZRootsIterator::do_jvmti_weak_export(ZRootsIteratorClosure* cl) {
235 ZStatTimer timer(ZSubPhasePauseRootsJVMTIWeakExport);
236 AlwaysTrueClosure always_alive;
237 JvmtiExport::weak_oops_do(&always_alive, cl);
238 }
239
240 void ZRootsIterator::do_system_dictionary(ZRootsIteratorClosure* cl) {
241 ZStatTimer timer(ZSubPhasePauseRootsSystemDictionary);
242 // Handles are processed via _vm_handles.
243 SystemDictionary::oops_do(cl, false /* include_handles */);
244 }
245
246 void ZRootsIterator::do_threads(ZRootsIteratorClosure* cl) {
247 ZStatTimer timer(ZSubPhasePauseRootsThreads);
248 ResourceMark rm;
249 ZRootsIteratorThreadClosure thread_cl(cl, _visit_invisible);
250 Threads::possibly_parallel_threads_do(true, &thread_cl);
251 }
252
253 void ZRootsIterator::do_code_cache(ZRootsIteratorClosure* cl) {
254 ZStatTimer timer(ZSubPhasePauseRootsCodeCache);
255 ZNMethod::oops_do(cl);
256 }
257
258 void ZRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
259 ZStatTimer timer(ZSubPhasePauseRoots);
260 _universe.oops_do(cl);
261 _object_synchronizer.oops_do(cl);
262 _management.oops_do(cl);
263 _jvmti_export.oops_do(cl);
264 _system_dictionary.oops_do(cl);
265 _threads.oops_do(cl);
266 if (!ClassUnloading) {
267 _code_cache.oops_do(cl);
268 }
269 if (_visit_jvmti_weak_export) {
270 _jvmti_weak_export.oops_do(cl);
271 }
272 }
273
274 ZConcurrentRootsIterator::ZConcurrentRootsIterator(int cld_claim) :
275 _jni_handles_iter(OopStorageSet::jni_global()),
276 _vm_handles_iter(OopStorageSet::vm_global()),
277 _cld_claim(cld_claim),
278 _jni_handles(this),
279 _vm_handles(this),
280 _class_loader_data_graph(this) {
281 ZStatTimer timer(ZSubPhaseConcurrentRootsSetup);
282 ClassLoaderDataGraph::clear_claimed_marks(cld_claim);
283 }
284
285 ZConcurrentRootsIterator::~ZConcurrentRootsIterator() {
286 ZStatTimer timer(ZSubPhaseConcurrentRootsTeardown);
287 }
288
289 void ZConcurrentRootsIterator::do_jni_handles(ZRootsIteratorClosure* cl) {
290 ZStatTimer timer(ZSubPhaseConcurrentRootsJNIHandles);
291 _jni_handles_iter.oops_do(cl);
292 }
293
294 void ZConcurrentRootsIterator::do_vm_handles(ZRootsIteratorClosure* cl) {
295 ZStatTimer timer(ZSubPhaseConcurrentRootsVMHandles);
296 _vm_handles_iter.oops_do(cl);
297 }
298
299 void ZConcurrentRootsIterator::do_class_loader_data_graph(ZRootsIteratorClosure* cl) {
300 ZStatTimer timer(ZSubPhaseConcurrentRootsClassLoaderDataGraph);
301 CLDToOopClosure cld_cl(cl, _cld_claim);
302 ClassLoaderDataGraph::always_strong_cld_do(&cld_cl);
303 }
304
305 void ZConcurrentRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
306 ZStatTimer timer(ZSubPhaseConcurrentRoots);
307 _jni_handles.oops_do(cl);
308 _vm_handles.oops_do(cl),
309 _class_loader_data_graph.oops_do(cl);
310 }
311
312 ZWeakRootsIterator::ZWeakRootsIterator() :
313 _jvmti_weak_export(this),
314 _jfr_weak(this) {
315 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
316 ZStatTimer timer(ZSubPhasePauseWeakRootsSetup);
317 }
318
319 ZWeakRootsIterator::~ZWeakRootsIterator() {
320 ZStatTimer timer(ZSubPhasePauseWeakRootsTeardown);
321 }
322
323 void ZWeakRootsIterator::do_jvmti_weak_export(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
324 ZStatTimer timer(ZSubPhasePauseWeakRootsJVMTIWeakExport);
325 JvmtiExport::weak_oops_do(is_alive, cl);
326 }
327
328 void ZWeakRootsIterator::do_jfr_weak(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
329 #if INCLUDE_JFR
330 ZStatTimer timer(ZSubPhasePauseWeakRootsJFRWeak);
331 Jfr::weak_oops_do(is_alive, cl);
332 #endif
333 }
334
335 void ZWeakRootsIterator::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
336 ZStatTimer timer(ZSubPhasePauseWeakRoots);
337 _jvmti_weak_export.weak_oops_do(is_alive, cl);
338 _jfr_weak.weak_oops_do(is_alive, cl);
339 }
340
341 void ZWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
342 AlwaysTrueClosure always_alive;
343 weak_oops_do(&always_alive, cl);
344 }
345
346 ZConcurrentWeakRootsIterator::ZConcurrentWeakRootsIterator() :
347 _vm_weak_handles_iter(OopStorageSet::vm_weak()),
348 _jni_weak_handles_iter(OopStorageSet::jni_weak()),
349 _string_table_iter(OopStorageSet::string_table_weak()),
350 _resolved_method_table_iter(OopStorageSet::resolved_method_table_weak()),
351 _vm_weak_handles(this),
352 _jni_weak_handles(this),
353 _string_table(this),
354 _resolved_method_table(this) {
355 StringTable::reset_dead_counter();
356 ResolvedMethodTable::reset_dead_counter();
357 }
358
359 ZConcurrentWeakRootsIterator::~ZConcurrentWeakRootsIterator() {
360 StringTable::finish_dead_counter();
361 ResolvedMethodTable::finish_dead_counter();
362 }
363
364 void ZConcurrentWeakRootsIterator::do_vm_weak_handles(ZRootsIteratorClosure* cl) {
365 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsVMWeakHandles);
366 _vm_weak_handles_iter.oops_do(cl);
367 }
368
369 void ZConcurrentWeakRootsIterator::do_jni_weak_handles(ZRootsIteratorClosure* cl) {
370 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsJNIWeakHandles);
371 _jni_weak_handles_iter.oops_do(cl);
372 }
373
374 template <class Container>
375 class ZDeadCounterClosure : public ZRootsIteratorClosure {
376 private:
377 ZRootsIteratorClosure* const _cl;
378 size_t _ndead;
379
380 public:
381 ZDeadCounterClosure(ZRootsIteratorClosure* cl) :
382 _cl(cl),
383 _ndead(0) {}
384
385 ~ZDeadCounterClosure() {
386 Container::inc_dead_counter(_ndead);
387 }
388
389 virtual void do_oop(oop* p) {
390 _cl->do_oop(p);
391 if (*p == NULL) {
392 _ndead++;
393 }
394 }
395
396 virtual void do_oop(narrowOop* p) {
397 ShouldNotReachHere();
398 }
399 };
400
401 void ZConcurrentWeakRootsIterator::do_string_table(ZRootsIteratorClosure* cl) {
402 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsStringTable);
403 ZDeadCounterClosure<StringTable> counter_cl(cl);
404 _string_table_iter.oops_do(&counter_cl);
405 }
406
407 void ZConcurrentWeakRootsIterator::do_resolved_method_table(ZRootsIteratorClosure* cl) {
408 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsResolvedMethodTable);
409 ZDeadCounterClosure<ResolvedMethodTable> counter_cl(cl);
410 _resolved_method_table_iter.oops_do(&counter_cl);
411 }
412
413 void ZConcurrentWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) {
414 ZStatTimer timer(ZSubPhaseConcurrentWeakRoots);
415 _vm_weak_handles.oops_do(cl);
416 _jni_weak_handles.oops_do(cl);
417 _string_table.oops_do(cl);
418 _resolved_method_table.oops_do(cl);
419 }