--- /dev/null	2019-01-28 17:46:58.000000000 +0800
+++ new/src/share/vm/jfr/recorder/checkpoint/constant/jfrConstantManager.cpp	2019-01-28 17:46:58.000000000 +0800
@@ -0,0 +1,233 @@
+/*
+ * 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/recorder/checkpoint/jfrCheckpointWriter.hpp"
+#include "jfr/recorder/checkpoint/constant/jfrConstantManager.hpp"
+#include "jfr/recorder/checkpoint/constant/jfrConstant.hpp"
+#include "jfr/utilities/jfrIterator.hpp"
+#include "runtime/safepoint.hpp"
+#include "runtime/thread.inline.hpp"
+#include "utilities/exceptions.hpp"
+
+JfrSerializerRegistration::JfrSerializerRegistration(JfrConstantTypeId id, bool permit_cache, JfrConstantSerializer* cs) :
+  _next(NULL),
+  _prev(NULL),
+  _serializer(cs),
+  _cache(),
+  _id(id),
+  _permit_cache(permit_cache) {}
+
+JfrSerializerRegistration::~JfrSerializerRegistration() {
+  delete _serializer;
+}
+
+JfrSerializerRegistration* JfrSerializerRegistration::next() const {
+  return _next;
+}
+
+void JfrSerializerRegistration::set_next(JfrSerializerRegistration* next) {
+  _next = next;
+}
+
+JfrSerializerRegistration* JfrSerializerRegistration::prev() const {
+  return _prev;
+}
+
+void JfrSerializerRegistration::set_prev(JfrSerializerRegistration* prev) {
+  _prev = prev;
+}
+
+JfrConstantTypeId JfrSerializerRegistration::id() const {
+  return _id;
+}
+
+void JfrSerializerRegistration::invoke_serializer(JfrCheckpointWriter& writer) const {
+  if (_cache.valid()) {
+    writer.increment();
+    _cache->write(writer);
+    return;
+  }
+  const JfrCheckpointContext ctx = writer.context();
+  writer.write_constant_type(_id);
+  _serializer->write_constants(writer);
+  if (_permit_cache) {
+    _cache = writer.copy(&ctx);
+  }
+}
+
+JfrConstantManager::~JfrConstantManager() {
+  Iterator iter(_constants);
+  JfrSerializerRegistration* registration;
+  while (iter.has_next()) {
+    registration = _constants.remove(iter.next());
+    assert(registration != NULL, "invariant");
+    delete registration;
+  }
+  Iterator sp_type_iter(_safepoint_constants);
+  while (sp_type_iter.has_next()) {
+    registration = _safepoint_constants.remove(sp_type_iter.next());
+    assert(registration != NULL, "invariant");
+    delete registration;
+  }
+}
+
+size_t JfrConstantManager::number_of_registered_constant_types() const {
+  size_t count = 0;
+  const Iterator iter(_constants);
+  while (iter.has_next()) {
+    ++count;
+    iter.next();
+  }
+  const Iterator sp_type_iter(_safepoint_constants);
+  while (sp_type_iter.has_next()) {
+    ++count;
+    sp_type_iter.next();
+  }
+  return count;
+}
+
+void JfrConstantManager::write_constants(JfrCheckpointWriter& writer) const {
+  const Iterator iter(_constants);
+  while (iter.has_next()) {
+    iter.next()->invoke_serializer(writer);
+  }
+}
+
+void JfrConstantManager::write_safepoint_constants(JfrCheckpointWriter& writer) const {
+  assert(SafepointSynchronize::is_at_safepoint(), "invariant");
+  const Iterator iter(_safepoint_constants);
+  while (iter.has_next()) {
+    iter.next()->invoke_serializer(writer);
+  }
+}
+
+void JfrConstantManager::write_constant_tag_set() const {
+  assert(!SafepointSynchronize::is_at_safepoint(), "invariant");
+  // can safepoint here because of PackageTable_lock
+  MutexLockerEx lock(PackageTable_lock);
+  JfrCheckpointWriter writer(true, true, Thread::current());
+  ConstantSet constant_set;
+  constant_set.write_constants(writer);
+}
+
+void JfrConstantManager::write_constant_tag_set_for_unloaded_classes() const {
+  assert(SafepointSynchronize::is_at_safepoint(), "invariant");
+  JfrCheckpointWriter writer(false, true, Thread::current());
+  ClassUnloadConstantSet class_unload_constant_set;
+  class_unload_constant_set.write_constants(writer);
+}
+
+void JfrConstantManager::create_thread_checkpoint(JavaThread* jt) const {
+  assert(jt != NULL, "invariant");
+  JfrThreadConstant constant_type_thread(jt);
+  JfrCheckpointWriter writer(false, true, jt);
+  writer.write_constant_type(CONSTANT_TYPE_THREAD);
+  constant_type_thread.write_constants(writer);
+  // create and install a checkpoint blob
+  jt->trace_data()->set_thread_checkpoint(writer.checkpoint_blob());
+  assert(jt->trace_data()->has_thread_checkpoint(), "invariant");
+}
+
+void JfrConstantManager::write_thread_checkpoint(JavaThread* jt) const {
+  assert(jt != NULL, "JavaThread is NULL!");
+  ResourceMark rm(jt);
+  if (jt->trace_data()->has_thread_checkpoint()) {
+    JfrCheckpointWriter writer(false, false, jt);
+    jt->trace_data()->thread_checkpoint()->write(writer);
+  } else {
+    JfrThreadConstant constant_type_thread(jt);
+    JfrCheckpointWriter writer(false, true, jt);
+    writer.write_constant_type(CONSTANT_TYPE_THREAD);
+    constant_type_thread.write_constants(writer);
+  }
+}
+
+#ifdef ASSERT
+static void assert_not_registered_twice(JfrConstantTypeId id, JfrConstantManager::List& list) {
+  const JfrConstantManager::Iterator iter(list);
+  while (iter.has_next()) {
+    assert(iter.next()->id() != id, "invariant");
+  }
+}
+#endif
+
+bool JfrConstantManager::register_serializer(JfrConstantTypeId id, bool require_safepoint, bool permit_cache, JfrConstantSerializer* cs) {
+  assert(cs != NULL, "invariant");
+  JfrSerializerRegistration* const registration = new JfrSerializerRegistration(id, permit_cache, cs);
+  if (registration == NULL) {
+    delete cs;
+    return false;
+  }
+  if (require_safepoint) {
+    assert(!_safepoint_constants.in_list(registration), "invariant");
+    DEBUG_ONLY(assert_not_registered_twice(id, _safepoint_constants);)
+      _safepoint_constants.prepend(registration);
+  }
+  else {
+    assert(!_constants.in_list(registration), "invariant");
+    DEBUG_ONLY(assert_not_registered_twice(id, _constants);)
+      _constants.prepend(registration);
+  }
+  return true;
+}
+
+bool JfrConstantManager::initialize() {
+  // non-safepointing serializers
+  for (size_t i = 0; i < 16; ++i) {
+    switch (i) {
+    case 0: register_serializer(CONSTANT_TYPE_FLAGVALUEORIGIN, false, true, new FlagValueOriginConstant()); break;
+    case 1: break;
+    case 2: register_serializer(CONSTANT_TYPE_GCCAUSE, false, true, new GCCauseConstant()); break;
+    case 3: register_serializer(CONSTANT_TYPE_GCNAME, false, true, new GCNameConstant()); break;
+    case 4: register_serializer(CONSTANT_TYPE_GCWHEN, false, true, new GCWhenConstant()); break;
+    case 5: register_serializer(CONSTANT_TYPE_G1HEAPREGIONTYPE, false, true, new G1HeapRegionTypeConstant()); break;
+    case 6: register_serializer(CONSTANT_TYPE_GCTHRESHOLDUPDATER, false, true, new GCThresholdUpdaterConstant()); break;
+    case 7: register_serializer(CONSTANT_TYPE_METADATATYPE, false, true, new MetadataTypeConstant()); break;
+    case 8: register_serializer(CONSTANT_TYPE_METASPACEOBJTYPE, false, true, new MetaspaceObjTypeConstant()); break;
+    case 9: register_serializer(CONSTANT_TYPE_G1YCTYPE, false, true, new G1YCTypeConstant()); break;
+    case 10: register_serializer(CONSTANT_TYPE_REFERENCETYPE, false, true, new ReferenceTypeConstant()); break;
+    case 11: register_serializer(CONSTANT_TYPE_NARROWOOPMODE, false, true, new NarrowOopModeConstant()); break;
+    case 12: register_serializer(CONSTANT_TYPE_COMPILERPHASETYPE, false, true, new CompilerPhaseTypeConstant()); break;
+    case 13: register_serializer(CONSTANT_TYPE_CODEBLOBTYPE, false, true, new CodeBlobTypeConstant()); break;
+    case 14: register_serializer(CONSTANT_TYPE_VMOPERATIONTYPE, false, true, new VMOperationTypeConstant()); break;
+    case 15: register_serializer(CONSTANT_TYPE_THREADSTATE, false, true, new ThreadStateConstant()); break;
+    default:
+      guarantee(false, "invariant");
+    }
+  }
+
+  // safepointing serializers
+  for (size_t i = 0; i < 2; ++i) {
+    switch (i) {
+    case 0: register_serializer(CONSTANT_TYPE_THREADGROUP, true, false, new JfrThreadGroupConstant()); break;
+    case 1: register_serializer(CONSTANT_TYPE_THREAD, true, false, new JfrThreadConstantSet()); break;
+    default:
+      guarantee(false, "invariant");
+    }
+  }
+  return true;
+}
+
+