| /* |
| * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "jfr/metadata/jfrSerializer.hpp" |
| #include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp" |
| #include "jfr/recorder/checkpoint/types/jfrType.hpp" |
| #include "jfr/recorder/checkpoint/types/jfrTypeManager.hpp" |
| #include "jfr/utilities/jfrDoublyLinkedList.hpp" |
| #include "jfr/utilities/jfrIterator.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/safepoint.hpp" |
| #include "runtime/semaphore.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "utilities/exceptions.hpp" |
| |
| class JfrSerializerRegistration : public JfrCHeapObj { |
| private: |
| JfrSerializerRegistration* _next; |
| JfrSerializerRegistration* _prev; |
| JfrSerializer* _serializer; |
| mutable JfrBlobHandle _cache; |
| JfrTypeId _id; |
| bool _permit_cache; |
| |
| public: |
| JfrSerializerRegistration(JfrTypeId id, bool permit_cache, JfrSerializer* serializer) : |
| _next(NULL), _prev(NULL), _serializer(serializer), _cache(), _id(id), _permit_cache(permit_cache) {} |
| |
| ~JfrSerializerRegistration() { |
| delete _serializer; |
| } |
| |
| JfrSerializerRegistration* next() const { |
| return _next; |
| } |
| |
| void set_next(JfrSerializerRegistration* next) { |
| _next = next; |
| } |
| |
| JfrSerializerRegistration* prev() const { |
| return _prev; |
| } |
| |
| void set_prev(JfrSerializerRegistration* prev) { |
| _prev = prev; |
| } |
| |
| JfrTypeId id() const { |
| return _id; |
| } |
| |
| void invoke(JfrCheckpointWriter& writer) const; |
| }; |
| |
| void JfrSerializerRegistration::invoke(JfrCheckpointWriter& writer) const { |
| if (_cache.valid()) { |
| writer.increment(); |
| _cache->write(writer); |
| return; |
| } |
| const JfrCheckpointContext ctx = writer.context(); |
| // serialize the type id before invoking callback |
| writer.write_type(_id); |
| const intptr_t start = writer.current_offset(); |
| // invoke the serializer routine |
| _serializer->serialize(writer); |
| if (start == writer.current_offset() ) { |
| // the serializer implementation did nothing, rewind to restore |
| writer.set_context(ctx); |
| return; |
| } |
| if (_permit_cache) { |
| _cache = writer.copy(&ctx); |
| } |
| } |
| |
| class SerializerRegistrationGuard : public StackObj { |
| private: |
| static Semaphore _mutex_semaphore; |
| public: |
| SerializerRegistrationGuard() { |
| _mutex_semaphore.wait(); |
| } |
| ~SerializerRegistrationGuard() { |
| _mutex_semaphore.signal(); |
| } |
| }; |
| |
| Semaphore SerializerRegistrationGuard::_mutex_semaphore(1); |
| |
| typedef JfrDoublyLinkedList<JfrSerializerRegistration> List; |
| typedef StopOnNullIterator<const List> Iterator; |
| static List types; |
| static List safepoint_types; |
| |
| void JfrTypeManager::destroy() { |
| SerializerRegistrationGuard guard; |
| Iterator iter(types); |
| JfrSerializerRegistration* registration; |
| while (iter.has_next()) { |
| registration = types.remove(iter.next()); |
| assert(registration != NULL, "invariant"); |
| delete registration; |
| } |
| Iterator sp_type_iter(safepoint_types); |
| while (sp_type_iter.has_next()) { |
| registration = safepoint_types.remove(sp_type_iter.next()); |
| assert(registration != NULL, "invariant"); |
| delete registration; |
| } |
| } |
| |
| void JfrTypeManager::write_types(JfrCheckpointWriter& writer) { |
| const Iterator iter(types); |
| while (iter.has_next()) { |
| iter.next()->invoke(writer); |
| } |
| } |
| |
| void JfrTypeManager::write_safepoint_types(JfrCheckpointWriter& writer) { |
| assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
| const Iterator iter(safepoint_types); |
| while (iter.has_next()) { |
| iter.next()->invoke(writer); |
| } |
| } |
| |
| void JfrTypeManager::create_thread_blob(JavaThread* jt) { |
| assert(jt != NULL, "invariant"); |
| ResourceMark rm(jt); |
| HandleMark hm(jt); |
| JfrThreadConstant type_thread(jt); |
| JfrCheckpointWriter writer(false, true, jt); |
| writer.write_type(TYPE_THREAD); |
| type_thread.serialize(writer); |
| // create and install a checkpoint blob |
| jt->jfr_thread_local()->set_thread_blob(writer.move()); |
| assert(jt->jfr_thread_local()->has_thread_blob(), "invariant"); |
| } |
| |
| void JfrTypeManager::write_thread_checkpoint(JavaThread* jt) { |
| assert(jt != NULL, "JavaThread is NULL!"); |
| ResourceMark rm(jt); |
| HandleMark hm(jt); |
| JfrThreadConstant type_thread(jt); |
| JfrCheckpointWriter writer(false, true, jt); |
| writer.write_type(TYPE_THREAD); |
| type_thread.serialize(writer); |
| } |
| |
| #ifdef ASSERT |
| static void assert_not_registered_twice(JfrTypeId id, List& list) { |
| const Iterator iter(list); |
| while (iter.has_next()) { |
| assert(iter.next()->id() != id, "invariant"); |
| } |
| } |
| #endif |
| |
| static bool register_type(JfrTypeId id, bool require_safepoint, bool permit_cache, JfrSerializer* serializer) { |
| assert(serializer != NULL, "invariant"); |
| JfrSerializerRegistration* const registration = new JfrSerializerRegistration(id, permit_cache, serializer); |
| if (registration == NULL) { |
| delete serializer; |
| return false; |
| } |
| if (require_safepoint) { |
| assert(!safepoint_types.in_list(registration), "invariant"); |
| DEBUG_ONLY(assert_not_registered_twice(id, safepoint_types);) |
| safepoint_types.prepend(registration); |
| } else { |
| assert(!types.in_list(registration), "invariant"); |
| DEBUG_ONLY(assert_not_registered_twice(id, types);) |
| types.prepend(registration); |
| } |
| return true; |
| } |
| |
| bool JfrTypeManager::initialize() { |
| SerializerRegistrationGuard guard; |
| |
| // register non-safepointing type serialization |
| register_type(TYPE_FLAGVALUEORIGIN, false, true, new FlagValueOriginConstant()); |
| register_type(TYPE_INFLATECAUSE, false, true, new MonitorInflateCauseConstant()); |
| register_type(TYPE_GCCAUSE, false, true, new GCCauseConstant()); |
| register_type(TYPE_GCNAME, false, true, new GCNameConstant()); |
| register_type(TYPE_GCWHEN, false, true, new GCWhenConstant()); |
| register_type(TYPE_GCTHRESHOLDUPDATER, false, true, new GCThresholdUpdaterConstant()); |
| register_type(TYPE_METADATATYPE, false, true, new MetadataTypeConstant()); |
| register_type(TYPE_METASPACEOBJECTTYPE, false, true, new MetaspaceObjectTypeConstant()); |
| register_type(TYPE_REFERENCETYPE, false, true, new ReferenceTypeConstant()); |
| register_type(TYPE_NARROWOOPMODE, false, true, new NarrowOopModeConstant()); |
| register_type(TYPE_COMPILERPHASETYPE, false, true, new CompilerPhaseTypeConstant()); |
| register_type(TYPE_CODEBLOBTYPE, false, true, new CodeBlobTypeConstant()); |
| register_type(TYPE_VMOPERATIONTYPE, false, true, new VMOperationTypeConstant()); |
| register_type(TYPE_THREADSTATE, false, true, new ThreadStateConstant()); |
| |
| // register safepointing type serialization |
| register_type(TYPE_THREADGROUP, true, false, new JfrThreadGroupConstant()); |
| register_type(TYPE_THREAD, true, false, new JfrThreadConstantSet()); |
| return true; |
| } |
| |
| // implementation for the static registration function exposed in the JfrSerializer api |
| bool JfrSerializer::register_serializer(JfrTypeId id, bool require_safepoint, bool permit_cache, JfrSerializer* serializer) { |
| SerializerRegistrationGuard guard; |
| return register_type(id, require_safepoint, permit_cache, serializer); |
| } |