    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 */
    017package org.apache.bcel.generic;
    018
    019/**
    020 * Super class for stack operations like DUP and POP.
    021 */
    022public abstract class StackInstruction extends Instruction {
    023
    024    /**
    025     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    026     */
    027    StackInstruction() {
    028    }
    029
    030    /**
    031     * @param opcode instruction opcode
    032     */
    033    protected StackInstruction(final short opcode) {
    034        super(opcode, (short) 1);
    035    }
    036
    037    /**
    038     * @return Type.UNKNOWN
    039     */
    040    public Type getType(final ConstantPoolGen cp) {
    041        return Type.UNKNOWN;
    042    }
    043}