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 */ 018package org.apache.bcel.generic; 019 020/** 021 * Super class for stack operations like DUP and POP. 022 * 023 */ 024public abstract class StackInstruction extends Instruction { 025 026 /** 027 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 028 */ 029 StackInstruction() { 030 } 031 032 /** 033 * @param opcode instruction opcode 034 */ 035 protected StackInstruction(final short opcode) { 036 super(opcode, (short) 1); 037 } 038 039 /** 040 * @return Type.UNKNOWN 041 */ 042 public Type getType(final ConstantPoolGen cp) { 043 return Type.UNKNOWN; 044 } 045}