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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