hotspot/src/share/vm/runtime/rframe.hpp
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Tue, 30 Jun 2015 14:44:53 -0700
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/*
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 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_RFRAME_HPP
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#define SHARE_VM_RUNTIME_RFRAME_HPP
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#include "memory/allocation.hpp"
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#include "runtime/frame.inline.hpp"
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// rframes ("recompiler frames") decorate stack frames with some extra information
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// needed by the recompiler.  The recompiler views the stack (at the time of recompilation)
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// as a list of rframes.
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class RFrame : public ResourceObj {
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  const frame _fr;                  // my frame
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  JavaThread* const _thread;        // thread where frame resides.
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  RFrame* _caller;                  // caller / callee rframes (or NULL)
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  RFrame*const _callee;
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  const int _num;                   // stack frame number (0 = most recent)
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  int _invocations;                 // current invocation estimate (for this frame)
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                                    // (i.e., how often was this frame called)
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  int _distance;                    // recompilation search "distance" (measured in # of interpreted frames)
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  RFrame(frame fr, JavaThread* thread, RFrame*const callee);
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  virtual void init() = 0;          // compute invocations, loopDepth, etc.
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  void print(const char* name);
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  static RFrame* new_RFrame(frame fr, JavaThread* thread, RFrame*const callee);
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  virtual bool is_interpreted() const     { return false; }
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  virtual bool is_compiled() const        { return false; }
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  int distance() const                    { return _distance; }
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  void set_distance(int d);
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  int invocations() const                 { return _invocations; }
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  int num() const                         { return _num; }
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  frame fr() const                        { return _fr; }
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  JavaThread* thread() const              { return _thread; }
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  virtual int cost() const = 0;           // estimated inlining cost (size)
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  virtual Method* top_method() const  = 0;
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  virtual javaVFrame* top_vframe() const = 0;
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  virtual nmethod* nm() const             { ShouldNotCallThis(); return NULL; }
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  RFrame* caller();
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  RFrame* callee() const                  { return _callee; }
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  RFrame* parent() const;                 // rframe containing lexical scope (if any)
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  virtual void print()                    = 0;
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  static int computeSends(Method* m);
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  static int computeSends(nmethod* nm);
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  static int computeCumulSends(Method* m);
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  static int computeCumulSends(nmethod* nm);
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};
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class CompiledRFrame : public RFrame {    // frame containing a compiled method
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  nmethod*    _nm;
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  javaVFrame* _vf;                        // top vframe; may be NULL (for most recent frame)
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  Method* _method;                        // top method
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  CompiledRFrame(frame fr, JavaThread* thread, RFrame*const  callee);
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  void init();
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  friend class RFrame;
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  CompiledRFrame(frame fr, JavaThread* thread); // for nmethod triggering its counter (callee == NULL)
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  bool is_compiled() const                 { return true; }
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  Method* top_method() const               { return _method; }
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  javaVFrame* top_vframe() const           { return _vf; }
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  nmethod* nm() const                      { return _nm; }
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  int cost() const;
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  void print();
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};
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class InterpretedRFrame : public RFrame {    // interpreter frame
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  javaVFrame* _vf;                           // may be NULL (for most recent frame)
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  Method* _method;
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  InterpretedRFrame(frame fr, JavaThread* thread, RFrame*const  callee);
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  void init();
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  friend class RFrame;
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  InterpretedRFrame(frame fr, JavaThread* thread, Method* m); // constructor for method triggering its invocation counter
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  bool is_interpreted() const                { return true; }
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  Method* top_method() const                 { return _method; }
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  javaVFrame* top_vframe() const             { return _vf; }
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  int cost() const;
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  void print();
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};
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// treat deoptimized frames as interpreted
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class DeoptimizedRFrame : public InterpretedRFrame {
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  DeoptimizedRFrame(frame fr, JavaThread* thread, RFrame*const  callee);
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  friend class RFrame;
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  void print();
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};
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#endif // SHARE_VM_RUNTIME_RFRAME_HPP