001/*
002 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003 *
004 *  This file is licensed to You under the Eclipse Public License (EPL);
005 *  You may not use this file except in compliance with the License. You
006 *  may obtain a copy of the License at
007 *
008 *      http://www.opensource.org/licenses/eclipse-1.0.php
009 *
010 *  See the COPYRIGHT.txt file distributed with this work for information
011 *  regarding copyright ownership.
012 */
013package org.jikesrvm.adaptive.measurements.listeners;
014
015import org.vmmagic.pragma.Uninterruptible;
016import org.vmmagic.unboxed.Address;
017
018/**
019 * This object that is invoked when online measurement information must
020 * be collected.
021 */
022@Uninterruptible
023public abstract class ContextListener extends Listener {
024
025  /**
026   * This method is called when its time to record that a yield point has occurred.
027   *
028   * @param sfp  pointer to stack frame where call stack should start
029   *             to be examined.
030   * @param whereFrom Was this a yieldpoint in a PROLOGUE, BACKEDGE, or
031   *            EPILOGUE?
032   */
033  public abstract void update(Address sfp, int whereFrom);
034}