1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  
57  import java.io.*;
58  import org.apache.bcel.util.ByteSequence;
59  
60  /*** 
61   * BIPUSH - Push byte on stack
62   *
63   * <PRE>Stack: ... -> ..., value</PRE>
64   *
65   * @version $Id: BIPUSH.java,v 1.2 2002/08/07 18:01:32 mdahm Exp $
66   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67   */
68  public class BIPUSH extends Instruction implements ConstantPushInstruction {
69    private byte b;
70  
71    /***
72     * Empty constructor needed for the Class.newInstance() statement in
73     * Instruction.readInstruction(). Not to be used otherwise.
74     */
75    BIPUSH() {}
76  
77    /*** Push byte on stack
78     */
79    public BIPUSH(byte b) {
80      super(org.apache.bcel.Constants.BIPUSH, (short)2);
81      this.b = b;
82    }
83  
84    /***
85     * Dump instruction as byte code to stream out.
86     */
87    public void dump(DataOutputStream out) throws IOException {
88      super.dump(out);
89      out.writeByte(b);
90    }
91  
92    /***
93     * @return mnemonic for instruction
94     */
95    public String toString(boolean verbose) {
96      return super.toString(verbose) + " " + b;
97    }
98  
99    /***
100    * Read needed data (e.g. index) from file.
101    */
102   protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
103   {
104     length = 2;
105     b      = bytes.readByte();
106   }
107 
108   public Number getValue() { return new Integer(b); }
109 
110   /*** @return Type.BYTE
111    */
112   public Type getType(ConstantPoolGen cp) {
113     return Type.BYTE;
114   }
115 
116   /***
117    * Call corresponding visitor method(s). The order is:
118    * Call visitor methods of implemented interfaces first, then
119    * call methods according to the class hierarchy in descending order,
120    * i.e., the most specific visitXXX() call comes last.
121    *
122    * @param v Visitor object
123    */
124   public void accept(Visitor v) {
125     v.visitPushInstruction(this);
126     v.visitStackProducer(this);
127     v.visitTypedInstruction(this);
128     v.visitConstantPushInstruction(this);
129     v.visitBIPUSH(this);
130   }
131 }
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