diff -r 13588c901957 -r 9cf78a70fa4f src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp
--- a/src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp	Thu Oct 17 20:53:35 2019 +0100
@@ -25,129 +25,49 @@
 #ifndef SHARE_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP
 #define SHARE_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP
 
+#include "jfr/recorder/stacktrace/jfrStackTrace.hpp"
 #include "jfr/utilities/jfrAllocation.hpp"
 #include "jfr/utilities/jfrTypes.hpp"
 
-class frame;
 class JavaThread;
 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),
-                                                        _max_frames(max_frames),
-                                                        _reached_root(false),
-                                                        _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 JfrThreadSampleClosure;
+  friend class ObjectSampleCheckpoint;
   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;
-  };
+  friend class StackTraceBlobInstaller;
+  friend class WriteStackTraceRepository;
 
  private:
   static const u4 TABLE_SIZE = 2053;
-  StackTrace* _table[TABLE_SIZE];
+  JfrStackTrace* _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);
+
+  size_t write_impl(JfrChunkWriter& cw, bool clear);
+  static void write_metadata(JfrCheckpointWriter& cpw);
   traceid write(JfrCheckpointWriter& cpw, traceid id, unsigned int hash);
   size_t write(JfrChunkWriter& cw, bool clear);
   size_t clear();
+
+  traceid add_trace(const JfrStackTrace& stacktrace);
+  static traceid add(const JfrStackTrace& stacktrace);
+  traceid record_for(JavaThread* thread, int skip, JfrStackFrame* frames, u4 max_frames);
+  const JfrStackTrace* lookup(unsigned int hash, traceid id) const;
+
+ public:
+  static traceid record(Thread* thread, int skip = 0);
+  static void record_and_cache(JavaThread* thread, int skip = 0);
 };
 
 #endif // SHARE_JFR_RECORDER_STACKTRACE_JFRSTACKTRACEREPOSITORY_HPP