--- /dev/null	2019-01-28 17:46:59.000000000 +0800
+++ new/src/share/vm/jfr/recorder/checkpoint/constant/jfrConstantManager.hpp	2019-01-28 17:46:59.000000000 +0800
@@ -0,0 +1,72 @@
+/*
+ * 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.
+ *
+ */
+#ifndef SHARE_VM_JFR_CHECKPOINT_CONSTANT_JFRCONSTANTMANAGER_HPP
+#define SHARE_VM_JFR_CHECKPOINT_CONSTANT_JFRCONSTANTMANAGER_HPP
+
+#include "jfr/metadata/jfrConstantSerializer.hpp"
+#include "jfr/utilities/jfrAllocation.hpp"
+#include "jfr/utilities/jfrDoublyLinkedList.hpp"
+#include "jfr/utilities/jfrIterator.hpp"
+
+class JfrSerializerRegistration : public JfrCHeapObj {
+ private:
+  JfrSerializerRegistration* _next;
+  JfrSerializerRegistration* _prev;
+  JfrConstantSerializer* _serializer;
+  mutable JfrCheckpointBlobHandle _cache;
+  JfrConstantTypeId _id;
+  bool _permit_cache;
+
+ public:
+  JfrSerializerRegistration(JfrConstantTypeId id, bool permit_cache, JfrConstantSerializer* serializer);
+  ~JfrSerializerRegistration();
+  JfrSerializerRegistration* next() const;
+  void set_next(JfrSerializerRegistration* next);
+  JfrSerializerRegistration* prev() const;
+  void set_prev(JfrSerializerRegistration* prev);
+  void invoke_serializer(JfrCheckpointWriter& writer) const;
+  JfrConstantTypeId id() const;
+};
+
+class JfrConstantManager : public JfrCHeapObj {
+  friend class JfrCheckpointManager;
+ public:
+  typedef JfrDoublyLinkedList<JfrSerializerRegistration> List;
+  typedef StopOnNullIterator<const List> Iterator;
+ private:
+  List _constants;
+  List _safepoint_constants;
+
+  ~JfrConstantManager();
+  bool initialize();
+  size_t number_of_registered_constant_types() const;
+  void write_constants(JfrCheckpointWriter& writer) const;
+  void write_safepoint_constants(JfrCheckpointWriter& writer) const;
+  void write_constant_tag_set() const;
+  void write_constant_tag_set_for_unloaded_classes() const;
+  void create_thread_checkpoint(JavaThread* jt) const;
+  void write_thread_checkpoint(JavaThread* jt) const;
+  bool register_serializer(JfrConstantTypeId id, bool require_safepoint, bool permit_cache, JfrConstantSerializer* serializer);
+};
+#endif // SHARE_VM_JFR_CHECKPOINT_CONSTANT_JFRCONSTANTMANAGER_HPP