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