1 /*

     2  * Copyright (c) 2004, 2013, Oracle and/or its affiliates. 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 Oracle 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             if (obj == null) {

    58                 throw new IllegalArgumentException("Null object.");

    59             }

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

    61         }

    62     }

    63 

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

    65      *   Tracker.NewArray() is injected.

    66      */

    67 

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

    69 

    70     public static void NewArray(Object obj)

    71     {

    72         if ( engaged != 0) {

    73             if (obj == null) {

    74                 throw new IllegalArgumentException("Null object.");

    75             }

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

    77         }

    78     }

    79 

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

    81 

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

    83      *   Tracker.CallSite() is injected.

    84      */

    85 

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

    87 

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

    89     {

    90         if ( engaged != 0 ) {

    91             if (cnum < 0) {

    92                 throw new IllegalArgumentException("Negative class index");

    93             }

    94 

    95             if (mnum < 0) {

    96                 throw new IllegalArgumentException("Negative method index");

    97             }

    98 

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

   100         }

   101     }

   102 

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

   104      *   Tracker.ReturnSite() is injected.

   105      */

   106 

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

   108 

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

   110     {

   111         if ( engaged != 0 ) {

   112             if (cnum < 0) {

   113                 throw new IllegalArgumentException("Negative class index");

   114             }

   115 

   116             if (mnum < 0) {

   117                 throw new IllegalArgumentException("Negative method index");

   118             }

   119 

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

   121         }

   122     }

   123 

   124 }