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  import java.io.*;
57  import org.apache.bcel.util.ByteSequence;
58  
59  /***
60   * SIPUSH - Push short
61   *
62   * <PRE>Stack: ... -> ..., value</PRE>
63   *
64   * @version $Id: SIPUSH.java,v 1.2 2002/08/07 18:01:32 mdahm Exp $
65   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
66   */
67  public class SIPUSH extends Instruction implements ConstantPushInstruction {
68    private short b;
69  
70    /***
71     * Empty constructor needed for the Class.newInstance() statement in
72     * Instruction.readInstruction(). Not to be used otherwise.
73     */
74    SIPUSH() {}
75  
76    public SIPUSH(short b) {
77      super(org.apache.bcel.Constants.SIPUSH, (short)3);
78      this.b = b;
79    }
80  
81    /***
82     * Dump instruction as short code to stream out.
83     */
84    public void dump(DataOutputStream out) throws IOException {
85      super.dump(out);
86      out.writeShort(b);
87    }
88  
89    /***
90     * @return mnemonic for instruction
91     */
92    public String toString(boolean verbose) {
93      return super.toString(verbose) + " " + b;
94    }
95  
96    /***
97     * Read needed data (e.g. index) from file.
98     */
99    protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
100   {
101     length = 3;
102     b      = bytes.readShort();
103   }
104 
105   public Number getValue() { return new Integer(b); }
106 
107   /*** @return Type.SHORT
108    */
109   public Type getType(ConstantPoolGen cp) {
110     return Type.SHORT;
111   }
112 
113   /***
114    * Call corresponding visitor method(s). The order is:
115    * Call visitor methods of implemented interfaces first, then
116    * call methods according to the class hierarchy in descending order,
117    * i.e., the most specific visitXXX() call comes last.
118    *
119    * @param v Visitor object
120    */
121   public void accept(Visitor v) {
122     v.visitPushInstruction(this);
123     v.visitStackProducer(this);
124     v.visitTypedInstruction(this);
125     v.visitConstantPushInstruction(this);
126     v.visitSIPUSH(this);
127   }
128 }
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