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1   /*
2    * reserved comment block
3    * DO NOT REMOVE OR ALTER!
4    */
5   package com.sun.org.apache.bcel.internal.generic;
6   
7   /* ====================================================================
8    * The Apache Software License, Version 1.1
9    *
10   * Copyright (c) 2001 The Apache Software Foundation.  All rights
11   * reserved.
12   *
13   * Redistribution and use in source and binary forms, with or without
14   * modification, are permitted provided that the following conditions
15   * are met:
16   *
17   * 1. Redistributions of source code must retain the above copyright
18   *    notice, this list of conditions and the following disclaimer.
19   *
20   * 2. Redistributions in binary form must reproduce the above copyright
21   *    notice, this list of conditions and the following disclaimer in
22   *    the documentation and/or other materials provided with the
23   *    distribution.
24   *
25   * 3. The end-user documentation included with the redistribution,
26   *    if any, must include the following acknowledgment:
27   *       "This product includes software developed by the
28   *        Apache Software Foundation (http://www.apache.org/)."
29   *    Alternately, this acknowledgment may appear in the software itself,
30   *    if and wherever such third-party acknowledgments normally appear.
31   *
32   * 4. The names "Apache" and "Apache Software Foundation" and
33   *    "Apache BCEL" must not be used to endorse or promote products
34   *    derived from this software without prior written permission. For
35   *    written permission, please contact apache@apache.org.
36   *
37   * 5. Products derived from this software may not be called "Apache",
38   *    "Apache BCEL", nor may "Apache" appear in their name, without
39   *    prior written permission of the Apache Software Foundation.
40   *
41   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52   * SUCH DAMAGE.
53   * ====================================================================
54   *
55   * This software consists of voluntary contributions made by many
56   * individuals on behalf of the Apache Software Foundation.  For more
57   * information on the Apache Software Foundation, please see
58   * <http://www.apache.org/>.
59   */
60  
61  import java.io.*;
62  import com.sun.org.apache.bcel.internal.util.ByteSequence;
63  
64  /**
65   * BIPUSH - Push byte on stack
66   *
67   * <PRE>Stack: ... -&gt; ..., value</PRE>
68   *
69   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
70   */
71  public class BIPUSH extends Instruction implements ConstantPushInstruction {
72    private byte b;
73  
74    /**
75     * Empty constructor needed for the Class.newInstance() statement in
76     * Instruction.readInstruction(). Not to be used otherwise.
77     */
78    BIPUSH() {}
79  
80    /** Push byte on stack
81     */
82    public BIPUSH(byte b) {
83      super(com.sun.org.apache.bcel.internal.Constants.BIPUSH, (short)2);
84      this.b = b;
85    }
86  
87    /**
88     * Dump instruction as byte code to stream out.
89     */
90    public void dump(DataOutputStream out) throws IOException {
91      super.dump(out);
92      out.writeByte(b);
93    }
94  
95    /**
96     * @return mnemonic for instruction
97     */
98    public String toString(boolean verbose) {
99      return super.toString(verbose) + " " + b;
100   }
101 
102   /**
103    * Read needed data (e.g. index) from file.
104    */
105   protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
106   {
107     length = 2;
108     b      = bytes.readByte();
109   }
110 
111   public Number getValue() { return new Integer(b); }
112 
113   /** @return Type.BYTE
114    */
115   public Type getType(ConstantPoolGen cp) {
116     return Type.BYTE;
117   }
118 
119   /**
120    * Call corresponding visitor method(s). The order is:
121    * Call visitor methods of implemented interfaces first, then
122    * call methods according to the class hierarchy in descending order,
123    * i.e., the most specific visitXXX() call comes last.
124    *
125    * @param v Visitor object
126    */
127   public void accept(Visitor v) {
128     v.visitPushInstruction(this);
129     v.visitStackProducer(this);
130     v.visitTypedInstruction(this);
131     v.visitConstantPushInstruction(this);
132     v.visitBIPUSH(this);
133   }
134 }