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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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