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