001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 *
017 */
018 package org.apache.bcel.generic;
019
020 /**
021 * DUP - Duplicate top operand stack word
022 * <PRE>Stack: ..., word -> ..., word, word</PRE>
023 *
024 * @version $Id: DUP.java 1152072 2011-07-29 01:54:05Z dbrosius $
025 * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
026 */
027 public class DUP extends StackInstruction implements PushInstruction {
028
029 private static final long serialVersionUID = 2297553463589366154L;
030
031
032 public DUP() {
033 super(org.apache.bcel.Constants.DUP);
034 }
035
036
037 /**
038 * Call corresponding visitor method(s). The order is:
039 * Call visitor methods of implemented interfaces first, then
040 * call methods according to the class hierarchy in descending order,
041 * i.e., the most specific visitXXX() call comes last.
042 *
043 * @param v Visitor object
044 */
045 @Override
046 public void accept( Visitor v ) {
047 v.visitStackProducer(this);
048 v.visitPushInstruction(this);
049 v.visitStackInstruction(this);
050 v.visitDUP(this);
051 }
052 }