1 /* 2 * Copyright (c) 2016, 2018, 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 25 #include "precompiled.hpp" 26 #include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp" 27 #include "jfr/recorder/checkpoint/types/jfrType.hpp" 28 #include "jfr/recorder/checkpoint/types/jfrTypeManager.hpp" 29 #include "jfr/utilities/jfrIterator.hpp" 30 #include "runtime/safepoint.hpp" 31 #include "runtime/thread.inline.hpp" 32 #include "utilities/exceptions.hpp" 33 34 JfrSerializerRegistration::JfrSerializerRegistration(JfrTypeId id, bool permit_cache, JfrSerializer* cs) : 35 _next(NULL), 36 _prev(NULL), 37 _serializer(cs), 38 _cache(), 39 _id(id), 40 _permit_cache(permit_cache) {} 41 42 JfrSerializerRegistration::~JfrSerializerRegistration() { 43 delete _serializer; 44 } 45 46 JfrSerializerRegistration* JfrSerializerRegistration::next() const { 47 return _next; 48 } 49 50 void JfrSerializerRegistration::set_next(JfrSerializerRegistration* next) { 51 _next = next; 52 } 53 54 JfrSerializerRegistration* JfrSerializerRegistration::prev() const { 55 return _prev; 56 } 57 58 void JfrSerializerRegistration::set_prev(JfrSerializerRegistration* prev) { 59 _prev = prev; 60 } 61 62 JfrTypeId JfrSerializerRegistration::id() const { 63 return _id; 64 } 65 66 void JfrSerializerRegistration::invoke_serializer(JfrCheckpointWriter& writer) const { 67 if (_cache.valid()) { 68 writer.increment(); 69 _cache->write(writer); 70 return; 71 } 72 const JfrCheckpointContext ctx = writer.context(); 73 writer.write_type(_id); 74 _serializer->serialize(writer); 75 if (_permit_cache) { 76 _cache = writer.copy(&ctx); 77 } 78 } 79 80 JfrTypeManager::~JfrTypeManager() { 81 Iterator iter(_types); 82 JfrSerializerRegistration* registration; 83 while (iter.has_next()) { 84 registration = _types.remove(iter.next()); 85 assert(registration != NULL, "invariant"); 86 delete registration; 87 } 88 Iterator sp_type_iter(_safepoint_types); 89 while (sp_type_iter.has_next()) { 90 registration = _safepoint_types.remove(sp_type_iter.next()); 91 assert(registration != NULL, "invariant"); 92 delete registration; 93 } 94 } 95 96 size_t JfrTypeManager::number_of_registered_types() const { 97 size_t count = 0; 98 const Iterator iter(_types); 99 while (iter.has_next()) { 100 ++count; 101 iter.next(); 102 } 103 const Iterator sp_type_iter(_safepoint_types); 104 while (sp_type_iter.has_next()) { 105 ++count; 106 sp_type_iter.next(); 107 } 108 return count; 109 } 110 111 void JfrTypeManager::write_types(JfrCheckpointWriter& writer) const { 112 const Iterator iter(_types); 113 while (iter.has_next()) { 114 iter.next()->invoke_serializer(writer); 115 } 116 } 117 118 void JfrTypeManager::write_safepoint_types(JfrCheckpointWriter& writer) const { 119 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); 120 const Iterator iter(_safepoint_types); 121 while (iter.has_next()) { 122 iter.next()->invoke_serializer(writer); 123 } 124 } 125 126 void JfrTypeManager::write_type_set() const { 127 assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); 128 // can safepoint here because of Module_lock 129 MutexLockerEx lock(Module_lock); 130 JfrCheckpointWriter writer(true, true, Thread::current()); 131 TypeSet set; 132 set.serialize(writer); 133 } 134 135 void JfrTypeManager::write_type_set_for_unloaded_classes() const { 136 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); 137 JfrCheckpointWriter writer(false, true, Thread::current()); 138 ClassUnloadTypeSet class_unload_set; 139 class_unload_set.serialize(writer); 140 } 141 142 void JfrTypeManager::create_thread_checkpoint(JavaThread* jt) const { 143 assert(jt != NULL, "invariant"); 144 JfrThreadConstant type_thread(jt); 145 JfrCheckpointWriter writer(false, true, jt); 146 writer.write_type(TYPE_THREAD); 147 type_thread.serialize(writer); 148 // create and install a checkpoint blob 149 jt->jfr_thread_local()->set_thread_checkpoint(writer.checkpoint_blob()); 150 assert(jt->jfr_thread_local()->has_thread_checkpoint(), "invariant"); 151 } 152 153 void JfrTypeManager::write_thread_checkpoint(JavaThread* jt) const { 154 assert(jt != NULL, "JavaThread is NULL!"); 155 ResourceMark rm(jt); 156 if (jt->jfr_thread_local()->has_thread_checkpoint()) { 157 JfrCheckpointWriter writer(false, false, jt); 158 jt->jfr_thread_local()->thread_checkpoint()->write(writer); 159 } else { 160 JfrThreadConstant type_thread(jt); 161 JfrCheckpointWriter writer(false, true, jt); 162 writer.write_type(TYPE_THREAD); 163 type_thread.serialize(writer); 164 } 165 } 166 167 #ifdef ASSERT 168 static void assert_not_registered_twice(JfrTypeId id, JfrTypeManager::List& list) { 169 const JfrTypeManager::Iterator iter(list); 170 while (iter.has_next()) { 171 assert(iter.next()->id() != id, "invariant"); 172 } 173 } 174 #endif 175 176 bool JfrTypeManager::register_serializer(JfrTypeId id, bool require_safepoint, bool permit_cache, JfrSerializer* cs) { 177 assert(cs != NULL, "invariant"); 178 JfrSerializerRegistration* const registration = new JfrSerializerRegistration(id, permit_cache, cs); 179 if (registration == NULL) { 180 delete cs; 181 return false; 182 } 183 if (require_safepoint) { 184 assert(!_safepoint_types.in_list(registration), "invariant"); 185 DEBUG_ONLY(assert_not_registered_twice(id, _safepoint_types);) 186 _safepoint_types.prepend(registration); 187 } 188 else { 189 assert(!_types.in_list(registration), "invariant"); 190 DEBUG_ONLY(assert_not_registered_twice(id, _types);) 191 _types.prepend(registration); 192 } 193 return true; 194 } 195 196 bool JfrTypeManager::initialize() { 197 // register non-safepointing type serialization 198 for (size_t i = 0; i < 16; ++i) { 199 switch (i) { 200 case 0: register_serializer(TYPE_FLAGVALUEORIGIN, false, true, new FlagValueOriginConstant()); break; 201 case 1: register_serializer(TYPE_INFLATECAUSE, false, true, new MonitorInflateCauseConstant()); break; 202 case 2: register_serializer(TYPE_GCCAUSE, false, true, new GCCauseConstant()); break; 203 case 3: register_serializer(TYPE_GCNAME, false, true, new GCNameConstant()); break; 204 case 4: register_serializer(TYPE_GCWHEN, false, true, new GCWhenConstant()); break; 205 case 5: register_serializer(TYPE_G1HEAPREGIONTYPE, false, true, new G1HeapRegionTypeConstant()); break; 206 case 6: register_serializer(TYPE_GCTHRESHOLDUPDATER, false, true, new GCThresholdUpdaterConstant()); break; 207 case 7: register_serializer(TYPE_METADATATYPE, false, true, new MetadataTypeConstant()); break; 208 case 8: register_serializer(TYPE_METASPACEOBJECTTYPE, false, true, new MetaspaceObjectTypeConstant()); break; 209 case 9: register_serializer(TYPE_G1YCTYPE, false, true, new G1YCTypeConstant()); break; 210 case 10: register_serializer(TYPE_REFERENCETYPE, false, true, new ReferenceTypeConstant()); break; 211 case 11: register_serializer(TYPE_NARROWOOPMODE, false, true, new NarrowOopModeConstant()); break; 212 case 12: register_serializer(TYPE_COMPILERPHASETYPE, false, true, new CompilerPhaseTypeConstant()); break; 213 case 13: register_serializer(TYPE_CODEBLOBTYPE, false, true, new CodeBlobTypeConstant()); break; 214 case 14: register_serializer(TYPE_VMOPERATIONTYPE, false, true, new VMOperationTypeConstant()); break; 215 case 15: register_serializer(TYPE_THREADSTATE, false, true, new ThreadStateConstant()); break; 216 default: 217 guarantee(false, "invariant"); 218 } 219 } 220 221 // register safepointing type serialization 222 for (size_t i = 0; i < 2; ++i) { 223 switch (i) { 224 case 0: register_serializer(TYPE_THREADGROUP, true, false, new JfrThreadGroupConstant()); break; 225 case 1: register_serializer(TYPE_THREAD, true, false, new JfrThreadConstantSet()); break; 226 default: 227 guarantee(false, "invariant"); 228 } 229 } 230 return true; 231 } 232 233