001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.bcel.generic; 020 021/** 022 * Super class for stack operations like DUP and POP. 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}