/* * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Oracle nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 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);        }    } }