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 * TABLESWITCH - Switch within given range of values, i.e., low..high
61 *
62 * @version $Id: TABLESWITCH.java,v 1.1.1.1 2001/10/29 20:00:27 jvanzyl Exp $
63 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
64 * @see SWITCH
65 */
66 public class TABLESWITCH extends Select {
67 /***
68 * Empty constructor needed for the Class.newInstance() statement in
69 * Instruction.readInstruction(). Not to be used otherwise.
70 */
71 TABLESWITCH() {}
72
73 /***
74 * @param match sorted array of match values, match[0] must be low value,
75 * match[match_length - 1] high value
76 * @param targets where to branch for matched values
77 * @param target default branch
78 */
79 public TABLESWITCH(int[] match, InstructionHandle[] targets,
80 InstructionHandle target) {
81 super(org.apache.bcel.Constants.TABLESWITCH, match, targets, target);
82
83 length = (short)(13 + match_length * 4); /* Alignment remainder assumed
84 * 0 here, until dump time */
85 fixed_length = length;
86 }
87
88 /***
89 * Dump instruction as byte code to stream out.
90 * @param out Output stream
91 */
92 public void dump(DataOutputStream out) throws IOException {
93 super.dump(out);
94
95 int low = (match_length > 0)? match[0] : 0;
96 out.writeInt(low);
97
98 int high = (match_length > 0)? match[match_length - 1] : 0;
99 out.writeInt(high);
100
101 for(int i=0; i < match_length; i++) // jump offsets
102 out.writeInt(indices[i] = getTargetOffset(targets[i]));
103 }
104
105 /***
106 * Read needed data (e.g. index) from file.
107 */
108 protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
109 {
110 super.initFromFile(bytes, wide);
111
112 int low = bytes.readInt();
113 int high = bytes.readInt();
114
115 match_length = high - low + 1;
116 fixed_length = (short)(13 + match_length * 4);
117 length = (short)(fixed_length + padding);
118
119 match = new int[match_length];
120 indices = new int[match_length];
121 targets = new InstructionHandle[match_length];
122
123 for(int i=low; i <= high; i++)
124 match[i - low] = i;
125
126 for(int i=0; i < match_length; i++) {
127 indices[i] = bytes.readInt();
128 }
129 }
130
131
132 /***
133 * Call corresponding visitor method(s). The order is:
134 * Call visitor methods of implemented interfaces first, then
135 * call methods according to the class hierarchy in descending order,
136 * i.e., the most specific visitXXX() call comes last.
137 *
138 * @param v Visitor object
139 */
140 public void accept(Visitor v) {
141 v.visitVariableLengthInstruction(this);
142 v.visitStackProducer(this);
143 v.visitBranchInstruction(this);
144 v.visitSelect(this);
145 v.visitTABLESWITCH(this);
146 }
147 }
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