/*
* @(#)Tracker.java 1.2 05/11/17
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package com.sun.demo.jvmti.hprof;
/* This class and it's methods are used by hprof when injecting bytecodes
* into class file images.
* See the directory src/share/demo/jvmti/hprof and the file README.txt
* for more details.
*/
public class Tracker {
/* Master switch that activates calls to native functions. */
private static int engaged = 0;
/* To track memory allocated, we need to catch object init's and arrays. */
/* At the beginning of java.jang.Object.<init>(), a call to
* Tracker.ObjectInit() is injected.
*/
private static native void nativeObjectInit(Object thr, Object obj);
public static void ObjectInit(Object obj)
{
if ( engaged != 0 ) {
nativeObjectInit(Thread.currentThread(), obj);
}
}
/* Immediately following any of the newarray bytecodes, a call to
* Tracker.NewArray() is injected.
*/
private static native void nativeNewArray(Object thr, Object obj);
public static void NewArray(Object obj)
{
if ( engaged != 0 ) {
nativeNewArray(Thread.currentThread(), obj);
}
}
/* For cpu time spent in methods, we need to inject for every method. */
/* At the very beginning of every method, a call to
* Tracker.CallSite() is injected.
*/
private static native void nativeCallSite(Object thr, int cnum, int mnum);
public static void CallSite(int cnum, int mnum)
{
if ( engaged != 0 ) {
nativeCallSite(Thread.currentThread(), cnum, mnum);
}
}
/* Before any of the return bytecodes, a call to
* Tracker.ReturnSite() is injected.
*/
private static native void nativeReturnSite(Object thr, int cnum, int mnum);
public static void ReturnSite(int cnum, int mnum)
{
if ( engaged != 0 ) {
nativeReturnSite(Thread.currentThread(), cnum, mnum);
}
}
}