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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