--- /dev/null	2019-01-28 17:47:46.000000000 +0800
+++ new/src/share/vm/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp	2019-01-28 17:47:46.000000000 +0800
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2011, 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_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP
+#define SHARE_VM_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP
+
+#include "jfr/utilities/jfrAllocation.hpp"
+#include "jfr/utilities/jfrTypes.hpp"
+
+class frame;
+class JavaThread;
+class JfrCheckpointSystem;
+class JfrCheckpointWriter;
+class JfrChunkWriter;
+class Method;
+
+class JfrStackFrame {
+ private:
+  const Method* _method;
+  traceid _methodid;
+  int _line;
+  int _bci;
+  u1 _type;
+
+ public:
+  enum {
+    FRAME_INTERPRETER = 0,
+    FRAME_JIT,
+    FRAME_INLINE,
+    FRAME_NATIVE,
+    NUM_FRAME_TYPES
+  };
+
+  JfrStackFrame(const traceid& id, int bci, int type, const Method* method) :
+    _method(method), _methodid(id), _line(0), _bci(bci), _type(type) {}
+  JfrStackFrame(const traceid& id, int bci, int type, int lineno) :
+    _method(NULL), _methodid(id), _line(lineno), _bci(bci), _type(type) {}
+  bool equals(const JfrStackFrame& rhs) const;
+  void write(JfrChunkWriter& cw) const;
+  void write(JfrCheckpointWriter& cpw) const;
+  void resolve_lineno();
+};
+
+class JfrStackTrace : public StackObj {
+  friend class JfrStackTraceRepository;
+ private:
+  JfrStackFrame* _frames;
+  traceid _id;
+  u4 _nr_of_frames;
+  unsigned int _hash;
+  const u4 _max_frames;
+  bool _reached_root;
+  bool _lineno;
+
+ public:
+  JfrStackTrace(JfrStackFrame* frames, u4 max_frames) : _frames(frames),
+                                                        _id(0),
+                                                        _nr_of_frames(0),
+                                                        _hash(0),
+                                                        _reached_root(false),
+                                                        _max_frames(max_frames),
+                                                        _lineno(false) {}
+  bool record_thread(JavaThread& thread, frame& frame);
+  bool record_safe(JavaThread* thread, int skip, bool leakp = false);
+  void resolve_linenos();
+  void set_nr_of_frames(u4 nr_of_frames) { _nr_of_frames = nr_of_frames; }
+  void set_hash(unsigned int hash) { _hash = hash; }
+  void set_frame(u4 frame_pos, JfrStackFrame& frame);
+  void set_reached_root(bool reached_root) { _reached_root = reached_root; }
+  bool full_stacktrace() const { return _reached_root; }
+  bool have_lineno() const { return _lineno; }
+};
+
+class JfrStackTraceRepository : public JfrCHeapObj {
+  friend class JfrRecorder;
+  friend class JfrRecorderService;
+  friend class ObjectSampler;
+  friend class WriteObjectSampleStacktrace;
+
+  class StackTrace : public JfrCHeapObj {
+    friend class JfrStackTrace;
+    friend class JfrStackTraceRepository;
+   private:
+    StackTrace* _next;
+    JfrStackFrame* _frames;
+    const traceid _id;
+    u4 _nr_of_frames;
+    unsigned int _hash;
+    bool _reached_root;
+    mutable bool _written;
+
+    unsigned int hash() const { return _hash; }
+    bool should_write() const { return !_written; }
+
+   public:
+    StackTrace(traceid id, const JfrStackTrace& trace, StackTrace* next);
+    ~StackTrace();
+    traceid id() const { return _id; }
+    StackTrace* next() const { return _next; }
+    void write(JfrChunkWriter& cw) const;
+    void write(JfrCheckpointWriter& cpw) const;
+    bool equals(const JfrStackTrace& rhs) const;
+  };
+
+ private:
+  static const u4 TABLE_SIZE = 2053;
+  StackTrace* _table[TABLE_SIZE];
+  traceid _next_id;
+  u4 _entries;
+
+  size_t write_impl(JfrChunkWriter& cw, bool clear);
+  traceid record_for(JavaThread* thread, int skip, JfrStackFrame* frames, u4 max_frames);
+  traceid record_for(JavaThread* thread, int skip, JfrStackFrame* frames, u4 max_frames, unsigned int* hash);
+  traceid add_trace(const JfrStackTrace& stacktrace);
+  const StackTrace* resolve_entry(unsigned int hash, traceid id) const;
+
+  static void write_metadata(JfrCheckpointWriter& cpw);
+
+  JfrStackTraceRepository();
+  static JfrStackTraceRepository& instance();
+ public:
+  static JfrStackTraceRepository* create();
+  bool initialize();
+  static void destroy();
+  static traceid add(const JfrStackTrace& stacktrace);
+  static traceid record(Thread* thread, int skip = 0);
+  static traceid record(Thread* thread, int skip, unsigned int* hash);
+  traceid write(JfrCheckpointWriter& cpw, traceid id, unsigned int hash);
+  size_t write(JfrChunkWriter& cw, bool clear);
+  size_t clear();
+};
+
+#endif // SHARE_VM_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP