/*

 * 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.

 *

 *

 */

// rframes ("recompiler frames") decorate stack frames with some extra information

// needed by the recompiler.  The recompiler views the stack (at the time of recompilation)

// as a list of rframes.

class RFrame : public ResourceObj {

 protected:

  const frame _fr;                  // my frame

  JavaThread* const _thread;        // thread where frame resides.

  RFrame* _caller;                  // caller / callee rframes (or NULL)

  RFrame*const _callee;

  const int _num;                   // stack frame number (0 = most recent)

  int _invocations;                 // current invocation estimate (for this frame)

                                    // (i.e., how often was this frame called)

  int _distance;                    // recompilation search "distance" (measured in # of interpreted frames)

  RFrame(frame fr, JavaThread* thread, RFrame*const callee);

  virtual void init() = 0;          // compute invocations, loopDepth, etc.

  void print(const char* name);

 public:

  static RFrame* new_RFrame(frame fr, JavaThread* thread, RFrame*const callee);

  virtual bool is_interpreted() const     { return false; }

  virtual bool is_compiled() const        { return false; }

  int distance() const                    { return _distance; }

  void set_distance(int d);

  int invocations() const                 { return _invocations; }

  int num() const                         { return _num; }

  frame fr() const                        { return _fr; }

  JavaThread* thread() const              { return _thread; }

  virtual int cost() const = 0;           // estimated inlining cost (size)

  virtual methodHandle top_method() const  = 0;

  virtual javaVFrame* top_vframe() const = 0;

  virtual nmethod* nm() const             { ShouldNotCallThis(); return NULL; }

  RFrame* caller();

  RFrame* callee() const                  { return _callee; }

  RFrame* parent() const;                 // rframe containing lexical scope (if any)

  virtual void print()                    = 0;

  static int computeSends(methodOop m);

  static int computeSends(nmethod* nm);

  static int computeCumulSends(methodOop m);

  static int computeCumulSends(nmethod* nm);

};

class CompiledRFrame : public RFrame {    // frame containing a compiled method

 protected:

  nmethod*    _nm;

  javaVFrame* _vf;                        // top vframe; may be NULL (for most recent frame)

  methodHandle _method;                   // top method

  CompiledRFrame(frame fr, JavaThread* thread, RFrame*const  callee);

  void init();

  friend class RFrame;

 public:

  CompiledRFrame(frame fr, JavaThread* thread); // for nmethod triggering its counter (callee == NULL)

  bool is_compiled() const                 { return true; }

  methodHandle top_method() const          { return _method; }

  javaVFrame* top_vframe() const           { return _vf; }

  nmethod* nm() const                      { return _nm; }

  int cost() const;

  void print();

};

class InterpretedRFrame : public RFrame {    // interpreter frame

 protected:

  javaVFrame* _vf;                           // may be NULL (for most recent frame)

  methodHandle   _method;

  InterpretedRFrame(frame fr, JavaThread* thread, RFrame*const  callee);

  void init();

  friend class RFrame;

 public:

  InterpretedRFrame(frame fr, JavaThread* thread, methodHandle m); // constructor for method triggering its invocation counter

  bool is_interpreted() const                { return true; }

  methodHandle top_method() const            { return _method; }

  javaVFrame* top_vframe() const             { return _vf; }

  int cost() const;

  void print();

};

// treat deoptimized frames as interpreted

class DeoptimizedRFrame : public InterpretedRFrame {

 protected:

  DeoptimizedRFrame(frame fr, JavaThread* thread, RFrame*const  callee);

  friend class RFrame;

 public:

  void print();

};