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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   */
18  package org.apache.bcel.generic;
19  
20  /**
21   * Super class for stack operations like DUP and POP.
22   *
23   */
24  public abstract class StackInstruction extends Instruction {
25  
26      /**
27       * Empty constructor needed for Instruction.readInstruction.
28       * Not to be used otherwise.
29       */
30      StackInstruction() {
31      }
32  
33  
34      /**
35       * @param opcode instruction opcode
36       */
37      protected StackInstruction(final short opcode) {
38          super(opcode, (short) 1);
39      }
40  
41  
42      /** @return Type.UNKNOWN
43       */
44      public Type getType( final ConstantPoolGen cp ) {
45          return Type.UNKNOWN;
46      }
47  }