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 import java.io.*;
61 import com.sun.org.apache.bcel.internal.util.ByteSequence;
62
63 /**
64 * LOOKUPSWITCH - Switch with unordered set of values
65 *
66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67 * @see SWITCH
68 */
69 public class LOOKUPSWITCH extends Select {
70 /**
71 * Empty constructor needed for the Class.newInstance() statement in
72 * Instruction.readInstruction(). Not to be used otherwise.
73 */
74 LOOKUPSWITCH() {}
75
76 public LOOKUPSWITCH(int[] match, InstructionHandle[] targets,
77 InstructionHandle target) {
78 super(com.sun.org.apache.bcel.internal.Constants.LOOKUPSWITCH, match, targets, target);
79
80 length = (short)(9 + match_length * 8); /* alignment remainder assumed
81 * 0 here, until dump time. */
82 fixed_length = length;
83 }
84
85 /**
86 * Dump instruction as byte code to stream out.
87 * @param out Output stream
88 */
89 public void dump(DataOutputStream out) throws IOException {
90 super.dump(out);
91 out.writeInt(match_length); // npairs
92
93 for(int i=0; i < match_length; i++) {
94 out.writeInt(match[i]); // match-offset pairs
95 out.writeInt(indices[i] = getTargetOffset(targets[i]));
96 }
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 super.initFromFile(bytes, wide); // reads padding
105
106 match_length = bytes.readInt();
107 fixed_length = (short)(9 + match_length * 8);
108 length = (short)(fixed_length + padding);
109
110 match = new int[match_length];
111 indices = new int[match_length];
112 targets = new InstructionHandle[match_length];
113
114 for(int i=0; i < match_length; i++) {
115 match[i] = bytes.readInt();
116 indices[i] = bytes.readInt();
117 }
118 }
119
120
121 /**
122 * Call corresponding visitor method(s). The order is:
123 * Call visitor methods of implemented interfaces first, then
124 * call methods according to the class hierarchy in descending order,
125 * i.e., the most specific visitXXX() call comes last.
126 *
127 * @param v Visitor object
128 */
129 public void accept(Visitor v) {
130 v.visitVariableLengthInstruction(this);
131 v.visitStackProducer(this);
132 v.visitBranchInstruction(this);
133 v.visitSelect(this);
134 v.visitLOOKUPSWITCH(this);
135 }
136 }