1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.generic;
  23 
  24 
  25 /**
  26  * Super class for stack operations like DUP and POP.
  27  *
  28  * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
  29  */
  30 public abstract class StackInstruction extends Instruction {
  31   /**
  32    * Empty constructor needed for the Class.newInstance() statement in
  33    * Instruction.readInstruction(). Not to be used otherwise.
  34    */
  35   StackInstruction() {}
  36 
  37   /**
  38    * @param opcode instruction opcode
  39    */
  40   protected StackInstruction(short opcode) {
  41     super(opcode, (short)1);
  42   }
  43 
  44   /** @return Type.UNKNOWN
  45    */
  46   public Type getType(ConstantPoolGen cp) {
  47     return Type.UNKNOWN;
  48   }
  49 }