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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