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comparison agent/src/share/classes/sun/jvm/hotspot/oops/MethodCounters.java @ 10105:aeaca88565e6

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8010862: The Method counter fields used for profiling can be allocated lazily. Summary: Allocate the method's profiling related metadata until they are needed. Reviewed-by: coleenp, roland
author jiangli
date Tue, 09 Apr 2013 17:17:41 -0400
parents
children de6a9e811145
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9055:dcdeb150988c 10105:aeaca88565e6
1 /*
2 * Copyright (c) 2013, 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