/*

 * Copyright (c) 2004, 2013, 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) {

            if (obj == null) {

                throw new IllegalArgumentException("Null object.");

            }

            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) {

            if (obj == null) {

                throw new IllegalArgumentException("Null object.");

            }

            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 ) {

            if (cnum < 0) {

                throw new IllegalArgumentException("Negative class index");

            }

            if (mnum < 0) {

                throw new IllegalArgumentException("Negative method index");

            }

            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 ) {

            if (cnum < 0) {

                throw new IllegalArgumentException("Negative class index");

            }

            if (mnum < 0) {

                throw new IllegalArgumentException("Negative method index");

            }

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

        }

    }

}