1 /*

     2  * Copyright 1997-2000 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

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

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

    27 // as a list of rframes.

    28 

    29 class RFrame : public ResourceObj {

    30  protected:

    31   const frame _fr;                  // my frame

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

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

    34   RFrame*const _callee;

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

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

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

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

    39 

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

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

    42   void print(const char* name);

    43 

    44  public:

    45 

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

    47 

    48   virtual bool is_interpreted() const     { return false; }

    49   virtual bool is_compiled() const        { return false; }

    50   int distance() const                    { return _distance; }

    51   void set_distance(int d);

    52   int invocations() const                 { return _invocations; }

    53   int num() const                         { return _num; }

    54   frame fr() const                        { return _fr; }

    55   JavaThread* thread() const              { return _thread; }

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

    57   virtual methodHandle top_method() const  = 0;

    58   virtual javaVFrame* top_vframe() const = 0;

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

    60 

    61   RFrame* caller();

    62   RFrame* callee() const                  { return _callee; }

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

    64   virtual void print()                    = 0;

    65 

    66   static int computeSends(methodOop m);

    67   static int computeSends(nmethod* nm);

    68   static int computeCumulSends(methodOop m);

    69   static int computeCumulSends(nmethod* nm);

    70 };

    71 

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

    73  protected:

    74   nmethod*    _nm;

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

    76   methodHandle _method;                   // top method

    77 

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

    79   void init();

    80   friend class RFrame;

    81 

    82  public:

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

    84   bool is_compiled() const                 { return true; }

    85   methodHandle top_method() const          { return _method; }

    86   javaVFrame* top_vframe() const           { return _vf; }

    87   nmethod* nm() const                      { return _nm; }

    88   int cost() const;

    89   void print();

    90 };

    91 

    92 class InterpretedRFrame : public RFrame {    // interpreter frame

    93  protected:

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

    95   methodHandle   _method;

    96 

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

    98   void init();

    99   friend class RFrame;

   100 

   101  public:

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

   103   bool is_interpreted() const                { return true; }

   104   methodHandle top_method() const            { return _method; }

   105   javaVFrame* top_vframe() const             { return _vf; }

   106   int cost() const;

   107   void print();

   108 };

   109 

   110 // treat deoptimized frames as interpreted

   111 class DeoptimizedRFrame : public InterpretedRFrame {

   112  protected:

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

   114   friend class RFrame;

   115  public:

   116   void print();

   117 };