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	/*
	* 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);
	}
	}

	}

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