1 /*

        2  * Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved.

        3  *

        4  * Redistribution and use in source and binary forms, with or without

        5  * modification, are permitted provided that the following conditions

        6  * are met:

        7  *

        8  *   - Redistributions of source code must retain the above copyright

        9  *     notice, this list of conditions and the following disclaimer.

       10  *

       11  *   - Redistributions in binary form must reproduce the above copyright

       12  *     notice, this list of conditions and the following disclaimer in the

       13  *     documentation and/or other materials provided with the distribution.

       14  *

       15  *   - Neither the name of Sun Microsystems nor the names of its

       16  *     contributors may be used to endorse or promote products derived

       17  *     from this software without specific prior written permission.

       18  *

       19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

       20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

       21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

       22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

       23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

       24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

       25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

       26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

       27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

       28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

       29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

       30  */

       31 

       32 package com.sun.demo.jvmti.hprof;

       33 

       34 /* This class and it's methods are used by hprof when injecting bytecodes

       35  *   into class file images.

       36  *   See the directory src/share/demo/jvmti/hprof and the file README.txt

       37  *   for more details.

       38  */

       39 

       40 public class Tracker {

       41 

       42     /* Master switch that activates calls to native functions. */

       43 

       44     private static int engaged = 0;

       45 

       46     /* To track memory allocated, we need to catch object init's and arrays. */

       47 

       48     /* At the beginning of java.jang.Object.<init>(), a call to

       49      *   Tracker.ObjectInit() is injected.

       50      */

       51 

       52     private static native void nativeObjectInit(Object thr, Object obj);

       53 

       54     public static void ObjectInit(Object obj)

       55     {

       56         if ( engaged != 0 ) {

       57             nativeObjectInit(Thread.currentThread(), obj);

       58         }

       59     }

       60 

       61     /* Immediately following any of the newarray bytecodes, a call to

       62      *   Tracker.NewArray() is injected.

       63      */

       64 

       65     private static native void nativeNewArray(Object thr, Object obj);

       66 

       67     public static void NewArray(Object obj)

       68     {

       69         if ( engaged != 0 ) {

       70             nativeNewArray(Thread.currentThread(), obj);

       71         }

       72     }

       73 

       74     /* For cpu time spent in methods, we need to inject for every method. */

       75 

       76     /* At the very beginning of every method, a call to

       77      *   Tracker.CallSite() is injected.

       78      */

       79 

       80     private static native void nativeCallSite(Object thr, int cnum, int mnum);

       81 

       82     public static void CallSite(int cnum, int mnum)

       83     {

       84         if ( engaged != 0 ) {

       85             nativeCallSite(Thread.currentThread(), cnum, mnum);

       86         }

       87     }

       88 

       89     /* Before any of the return bytecodes, a call to

       90      *   Tracker.ReturnSite() is injected.

       91      */

       92 

       93     private static native void nativeReturnSite(Object thr, int cnum, int mnum);

       94 

       95     public static void ReturnSite(int cnum, int mnum)

       96     {

       97         if ( engaged != 0 ) {

       98             nativeReturnSite(Thread.currentThread(), cnum, mnum);

       99         }

      100     }

      101 

      102 }