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/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/thread.hpp" 49 #include "runtime/safepoint.hpp" 50 #include "runtime/synchronizer.hpp" 51 #include "services/management.hpp" 52 #include "utilities/debug.hpp" 53 #if INCLUDE_JFR 54 #include "jfr/jfr.hpp" 55 #endif 56 57 static const ZStatSubPhase ZSubPhasePauseRootsSetup("Pause Roots Setup"); 58 static const ZStatSubPhase ZSubPhasePauseRoots("Pause Roots"); 59 static const ZStatSubPhase ZSubPhasePauseRootsTeardown("Pause Roots Teardown"); 60 static const ZStatSubPhase ZSubPhasePauseRootsUniverse("Pause Roots Universe"); 61 static const ZStatSubPhase ZSubPhasePauseRootsObjectSynchronizer("Pause Roots ObjectSynchronizer"); 62 static const ZStatSubPhase ZSubPhasePauseRootsManagement("Pause Roots Management"); 63 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIExport("Pause Roots JVMTIExport"); 64 static const ZStatSubPhase ZSubPhasePauseRootsJVMTIWeakExport("Pause Roots JVMTIWeakExport"); 65 static const ZStatSubPhase ZSubPhasePauseRootsSystemDictionary("Pause Roots SystemDictionary"); 66 static const ZStatSubPhase ZSubPhasePauseRootsThreads("Pause Roots Threads"); 67 static const ZStatSubPhase ZSubPhasePauseRootsCodeCache("Pause Roots CodeCache"); 68 69 static const ZStatSubPhase ZSubPhaseConcurrentRootsSetup("Concurrent Roots Setup"); 70 static const ZStatSubPhase ZSubPhaseConcurrentRoots("Concurrent Roots"); 71 static const ZStatSubPhase ZSubPhaseConcurrentRootsTeardown("Concurrent Roots Teardown"); 72 static const ZStatSubPhase ZSubPhaseConcurrentRootsJNIHandles("Concurrent Roots JNIHandles"); 73 static const ZStatSubPhase ZSubPhaseConcurrentRootsVMHandles("Concurrent Roots VMHandles"); 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 CodeBlobToOopClosure { 143 private: 144 BarrierSetNMethod* _bs; 145 146 public: 147 ZRootsIteratorCodeBlobClosure(OopClosure* cl) : 148 CodeBlobToOopClosure(cl, true /* fix_relocations */), 149 _bs(BarrierSet::barrier_set()->barrier_set_nmethod()) {} 150 151 virtual void do_code_blob(CodeBlob* cb) { 152 nmethod* const nm = cb->as_nmethod_or_null(); 153 if (nm != NULL && nm->oops_do_try_claim()) { 154 CodeBlobToOopClosure::do_code_blob(cb); 155 _bs->disarm(nm); 156 } 157 } 158 }; 159 160 class ZRootsIteratorThreadClosure : public ThreadClosure { 161 private: 162 ZRootsIteratorClosure* _cl; 163 164 public: 165 ZRootsIteratorThreadClosure(ZRootsIteratorClosure* cl) : 166 _cl(cl) {} 167 168 virtual void do_thread(Thread* thread) { 169 ZRootsIteratorCodeBlobClosure code_cl(_cl); 170 thread->oops_do(_cl, ClassUnloading ? &code_cl : NULL); 171 _cl->do_thread(thread); 172 } 173 }; 174 175 ZRootsIterator::ZRootsIterator(bool visit_jvmti_weak_export) : 176 _visit_jvmti_weak_export(visit_jvmti_weak_export), 177 _universe(this), 178 _object_synchronizer(this), 179 _management(this), 180 _jvmti_export(this), 181 _jvmti_weak_export(this), 182 _system_dictionary(this), 183 _threads(this), 184 _code_cache(this) { 185 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); 186 ZStatTimer timer(ZSubPhasePauseRootsSetup); 187 Threads::change_thread_claim_token(); 188 COMPILER2_PRESENT(DerivedPointerTable::clear()); 189 if (ClassUnloading) { 190 nmethod::oops_do_marking_prologue(); 191 } else { 192 ZNMethod::oops_do_begin(); 193 } 194 } 195 196 ZRootsIterator::~ZRootsIterator() { 197 ZStatTimer timer(ZSubPhasePauseRootsTeardown); 198 ResourceMark rm; 199 if (ClassUnloading) { 200 nmethod::oops_do_marking_epilogue(); 201 } else { 202 ZNMethod::oops_do_end(); 203 } 204 205 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); 206 Threads::assert_all_threads_claimed(); 207 } 208 209 void ZRootsIterator::do_universe(ZRootsIteratorClosure* cl) { 210 ZStatTimer timer(ZSubPhasePauseRootsUniverse); 211 Universe::oops_do(cl); 212 } 213 214 void ZRootsIterator::do_object_synchronizer(ZRootsIteratorClosure* cl) { 215 ZStatTimer timer(ZSubPhasePauseRootsObjectSynchronizer); 216 ObjectSynchronizer::oops_do(cl); 217 } 218 219 void ZRootsIterator::do_management(ZRootsIteratorClosure* cl) { 220 ZStatTimer timer(ZSubPhasePauseRootsManagement); 221 Management::oops_do(cl); 222 } 223 224 void ZRootsIterator::do_jvmti_export(ZRootsIteratorClosure* cl) { 225 ZStatTimer timer(ZSubPhasePauseRootsJVMTIExport); 226 JvmtiExport::oops_do(cl); 227 } 228 229 void ZRootsIterator::do_jvmti_weak_export(ZRootsIteratorClosure* cl) { 230 ZStatTimer timer(ZSubPhasePauseRootsJVMTIWeakExport); 231 AlwaysTrueClosure always_alive; 232 JvmtiExport::weak_oops_do(&always_alive, cl); 233 } 234 235 void ZRootsIterator::do_system_dictionary(ZRootsIteratorClosure* cl) { 236 ZStatTimer timer(ZSubPhasePauseRootsSystemDictionary); 237 // Handles are processed via _vm_handles. 238 SystemDictionary::oops_do(cl, false /* include_handles */); 239 } 240 241 void ZRootsIterator::do_threads(ZRootsIteratorClosure* cl) { 242 ZStatTimer timer(ZSubPhasePauseRootsThreads); 243 ResourceMark rm; 244 ZRootsIteratorThreadClosure thread_cl(cl); 245 Threads::possibly_parallel_threads_do(true, &thread_cl); 246 } 247 248 void ZRootsIterator::do_code_cache(ZRootsIteratorClosure* cl) { 249 ZStatTimer timer(ZSubPhasePauseRootsCodeCache); 250 ZNMethod::oops_do(cl); 251 } 252 253 void ZRootsIterator::oops_do(ZRootsIteratorClosure* cl) { 254 ZStatTimer timer(ZSubPhasePauseRoots); 255 _universe.oops_do(cl); 256 _object_synchronizer.oops_do(cl); 257 _management.oops_do(cl); 258 _jvmti_export.oops_do(cl); 259 _system_dictionary.oops_do(cl); 260 _threads.oops_do(cl); 261 if (!ClassUnloading) { 262 _code_cache.oops_do(cl); 263 } 264 if (_visit_jvmti_weak_export) { 265 _jvmti_weak_export.oops_do(cl); 266 } 267 } 268 269 ZConcurrentRootsIterator::ZConcurrentRootsIterator(int cld_claim) : 270 _jni_handles_iter(OopStorageSet::jni_global()), 271 _vm_handles_iter(OopStorageSet::vm_global()), 272 _cld_claim(cld_claim), 273 _jni_handles(this), 274 _vm_handles(this), 275 _class_loader_data_graph(this) { 276 ZStatTimer timer(ZSubPhaseConcurrentRootsSetup); 277 ClassLoaderDataGraph::clear_claimed_marks(cld_claim); 278 } 279 280 ZConcurrentRootsIterator::~ZConcurrentRootsIterator() { 281 ZStatTimer timer(ZSubPhaseConcurrentRootsTeardown); 282 } 283 284 void ZConcurrentRootsIterator::do_jni_handles(ZRootsIteratorClosure* cl) { 285 ZStatTimer timer(ZSubPhaseConcurrentRootsJNIHandles); 286 _jni_handles_iter.oops_do(cl); 287 } 288 289 void ZConcurrentRootsIterator::do_vm_handles(ZRootsIteratorClosure* cl) { 290 ZStatTimer timer(ZSubPhaseConcurrentRootsVMHandles); 291 _vm_handles_iter.oops_do(cl); 292 } 293 294 void ZConcurrentRootsIterator::do_class_loader_data_graph(ZRootsIteratorClosure* cl) { 295 ZStatTimer timer(ZSubPhaseConcurrentRootsClassLoaderDataGraph); 296 CLDToOopClosure cld_cl(cl, _cld_claim); 297 ClassLoaderDataGraph::always_strong_cld_do(&cld_cl); 298 } 299 300 void ZConcurrentRootsIterator::oops_do(ZRootsIteratorClosure* cl) { 301 ZStatTimer timer(ZSubPhaseConcurrentRoots); 302 _jni_handles.oops_do(cl); 303 _vm_handles.oops_do(cl), 304 _class_loader_data_graph.oops_do(cl); 305 } 306 307 ZWeakRootsIterator::ZWeakRootsIterator() : 308 _jvmti_weak_export(this), 309 _jfr_weak(this) { 310 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); 311 ZStatTimer timer(ZSubPhasePauseWeakRootsSetup); 312 } 313 314 ZWeakRootsIterator::~ZWeakRootsIterator() { 315 ZStatTimer timer(ZSubPhasePauseWeakRootsTeardown); 316 } 317 318 void ZWeakRootsIterator::do_jvmti_weak_export(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) { 319 ZStatTimer timer(ZSubPhasePauseWeakRootsJVMTIWeakExport); 320 JvmtiExport::weak_oops_do(is_alive, cl); 321 } 322 323 void ZWeakRootsIterator::do_jfr_weak(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) { 324 #if INCLUDE_JFR 325 ZStatTimer timer(ZSubPhasePauseWeakRootsJFRWeak); 326 Jfr::weak_oops_do(is_alive, cl); 327 #endif 328 } 329 330 void ZWeakRootsIterator::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) { 331 ZStatTimer timer(ZSubPhasePauseWeakRoots); 332 _jvmti_weak_export.weak_oops_do(is_alive, cl); 333 _jfr_weak.weak_oops_do(is_alive, cl); 334 } 335 336 void ZWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) { 337 AlwaysTrueClosure always_alive; 338 weak_oops_do(&always_alive, cl); 339 } 340 341 ZConcurrentWeakRootsIterator::ZConcurrentWeakRootsIterator() : 342 _vm_weak_handles_iter(OopStorageSet::vm_weak()), 343 _jni_weak_handles_iter(OopStorageSet::jni_weak()), 344 _string_table_iter(OopStorageSet::string_table_weak()), 345 _resolved_method_table_iter(OopStorageSet::resolved_method_table_weak()), 346 _vm_weak_handles(this), 347 _jni_weak_handles(this), 348 _string_table(this), 349 _resolved_method_table(this) { 350 StringTable::reset_dead_counter(); 351 ResolvedMethodTable::reset_dead_counter(); 352 } 353 354 ZConcurrentWeakRootsIterator::~ZConcurrentWeakRootsIterator() { 355 StringTable::finish_dead_counter(); 356 ResolvedMethodTable::finish_dead_counter(); 357 } 358 359 void ZConcurrentWeakRootsIterator::do_vm_weak_handles(ZRootsIteratorClosure* cl) { 360 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsVMWeakHandles); 361 _vm_weak_handles_iter.oops_do(cl); 362 } 363 364 void ZConcurrentWeakRootsIterator::do_jni_weak_handles(ZRootsIteratorClosure* cl) { 365 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsJNIWeakHandles); 366 _jni_weak_handles_iter.oops_do(cl); 367 } 368 369 template <class Container> 370 class ZDeadCounterClosure : public ZRootsIteratorClosure { 371 private: 372 ZRootsIteratorClosure* const _cl; 373 size_t _ndead; 374 375 public: 376 ZDeadCounterClosure(ZRootsIteratorClosure* cl) : 377 _cl(cl), 378 _ndead(0) {} 379 380 ~ZDeadCounterClosure() { 381 Container::inc_dead_counter(_ndead); 382 } 383 384 virtual void do_oop(oop* p) { 385 _cl->do_oop(p); 386 if (*p == NULL) { 387 _ndead++; 388 } 389 } 390 391 virtual void do_oop(narrowOop* p) { 392 ShouldNotReachHere(); 393 } 394 }; 395 396 void ZConcurrentWeakRootsIterator::do_string_table(ZRootsIteratorClosure* cl) { 397 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsStringTable); 398 ZDeadCounterClosure<StringTable> counter_cl(cl); 399 _string_table_iter.oops_do(&counter_cl); 400 } 401 402 void ZConcurrentWeakRootsIterator::do_resolved_method_table(ZRootsIteratorClosure* cl) { 403 ZStatTimer timer(ZSubPhaseConcurrentWeakRootsResolvedMethodTable); 404 ZDeadCounterClosure<ResolvedMethodTable> counter_cl(cl); 405 _resolved_method_table_iter.oops_do(&counter_cl); 406 } 407 408 void ZConcurrentWeakRootsIterator::oops_do(ZRootsIteratorClosure* cl) { 409 ZStatTimer timer(ZSubPhaseConcurrentWeakRoots); 410 _vm_weak_handles.oops_do(cl); 411 _jni_weak_handles.oops_do(cl); 412 _string_table.oops_do(cl); 413 _resolved_method_table.oops_do(cl); 414 }