1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.oops;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.runtime.*;
  31 import sun.jvm.hotspot.types.*;
  32 import sun.jvm.hotspot.utilities.*;
  33 
  34 public class MethodCounters extends Metadata {
  35   public MethodCounters(Address addr) {
  36     super(addr);
  37   }
  38 
  39   static {
  40     VM.registerVMInitializedObserver(new Observer() {
  41         public void update(Observable o, Object data) {
  42           initialize(VM.getVM().getTypeDataBase());
  43         }
  44       });
  45   }
  46 
  47   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  48     Type type      = db.lookupType("MethodCounters");
  49 
  50     interpreterInvocationCountField = new CIntField(type.getCIntegerField("_interpreter_invocation_count"), 0);
  51     interpreterThrowoutCountField = new CIntField(type.getCIntegerField("_interpreter_throwout_count"), 0);
  52     if (!VM.getVM().isCore()) {
  53       invocationCounter        = new CIntField(type.getCIntegerField("_invocation_counter"), 0);
  54       backedgeCounter          = new CIntField(type.getCIntegerField("_backedge_counter"), 0);
  55     }
  56   }
  57 
  58   private static CIntField interpreterInvocationCountField;
  59   private static CIntField interpreterThrowoutCountField;
  60   private static CIntField invocationCounter;
  61   private static CIntField backedgeCounter;
  62 
  63   public int interpreterInvocationCount() {
  64     return (int) interpreterInvocationCountField.getValue(this);
  65   }
  66 
  67   public int interpreterThrowoutCount() {
  68     return (int) interpreterThrowoutCountField.getValue(this);
  69   }
  70   public long getInvocationCounter() {
  71     if (Assert.ASSERTS_ENABLED) {
  72       Assert.that(!VM.getVM().isCore(), "must not be used in core build");
  73     }
  74     return invocationCounter.getValue(this);
  75   }
  76   public long getBackedgeCounter() {
  77     if (Assert.ASSERTS_ENABLED) {
  78       Assert.that(!VM.getVM().isCore(), "must not be used in core build");
  79     }
  80     return backedgeCounter.getValue(this);
  81   }
  82 
  83   public void printValueOn(PrintStream tty) {
  84   }
  85 }
  86