Java example source code file (Block.java)

This example Java source code file (Block.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

addressfield, block, cintfield, freq, jfloatfield, node_list, observer, util, vmobject, wrongtypeexception

The Block.java Java example source code

/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.opto;

import java.util.*;
import java.io.PrintStream;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.types.*;

public class Block extends VMObject {
  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
    Type type      = db.lookupType("Block");
    nodesField = type.getAddressField("_nodes");
    succsField = type.getAddressField("_succs");
    numSuccsField = new CIntField(type.getCIntegerField("_num_succs"), 0);
    preOrderField = new CIntField(type.getCIntegerField("_pre_order"), 0);
    domDepthField = new CIntField(type.getCIntegerField("_dom_depth"), 0);
    idomField = type.getAddressField("_idom");
    freqField = type.getJFloatField("_freq");
  }

  private static AddressField nodesField;
  private static AddressField succsField;
  private static CIntField numSuccsField;
  private static CIntField preOrderField;
  private static CIntField domDepthField;
  private static AddressField idomField;
  private static JFloatField freqField;

  public Block(Address addr) {
    super(addr);
  }

  public int preOrder() {
    return (int)preOrderField.getValue(getAddress());
  }

  public float freq() {
    return (float)freqField.getValue(getAddress());
  }

  public Node_List nodes() {
    return new Node_List(getAddress().addOffsetTo(nodesField.getOffset()));
  }

  public void dump(PrintStream out) {
    out.print("B" + preOrder());
    out.print(" Freq: " + freq());
    out.println();
    Node_List nl = nodes();
    int cnt = nl.size();
    for( int i=0; i<cnt; i++ )
      nl.at(i).dump(out);
    out.print("\n");
  }
}