MethodCounters.java revision 10786:1e653c794138 
1/*
2 * Copyright (c) 2013, 2016 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
25package sun.jvm.hotspot.oops;
26
27import java.io.*;
28import java.util.*;
29import sun.jvm.hotspot.debugger.*;
30import sun.jvm.hotspot.runtime.*;
31import sun.jvm.hotspot.types.*;
32import sun.jvm.hotspot.utilities.*;
33
34public 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    if (VM.getVM().isServerCompiler()) {
51      interpreterInvocationCountField = new CIntField(type.getCIntegerField("_interpreter_invocation_count"), 0);
52      interpreterThrowoutCountField = new CIntField(type.getCIntegerField("_interpreter_throwout_count"), 0);
53    }
54    if (!VM.getVM().isCore()) {
55      invocationCounter        = new CIntField(type.getCIntegerField("_invocation_counter"), 0);
56      backedgeCounter          = new CIntField(type.getCIntegerField("_backedge_counter"), 0);
57    }
58  }
59
60  private static CIntField interpreterInvocationCountField;
61  private static CIntField interpreterThrowoutCountField;
62  private static CIntField invocationCounter;
63  private static CIntField backedgeCounter;
64
65  public int interpreterInvocationCount() {
66      if (interpreterInvocationCountField != null) {
67        return (int) interpreterInvocationCountField.getValue(this);
68      } else {
69        return 0;
70      }
71  }
72
73  public int interpreterThrowoutCount() {
74      if (interpreterThrowoutCountField != null) {
75        return (int) interpreterThrowoutCountField.getValue(this);
76      } else {
77        return 0;
78      }
79  }
80  public long getInvocationCounter() {
81    if (Assert.ASSERTS_ENABLED) {
82      Assert.that(!VM.getVM().isCore(), "must not be used in core build");
83    }
84    return invocationCounter.getValue(this);
85  }
86  public long getBackedgeCounter() {
87    if (Assert.ASSERTS_ENABLED) {
88      Assert.that(!VM.getVM().isCore(), "must not be used in core build");
89    }
90    return backedgeCounter.getValue(this);
91  }
92
93  public void printValueOn(PrintStream tty) {
94  }
95}
96
97