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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 * IINC - Increment local variable by constant 61 * 62 * @version $Id: IINC.java,v 1.2 2002/03/12 09:24:01 mdahm Exp $ 63 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 64 */ 65 public class IINC extends LocalVariableInstruction { 66 private boolean wide; 67 private int c; 68 69 /*** 70 * Empty constructor needed for the Class.newInstance() statement in 71 * Instruction.readInstruction(). Not to be used otherwise. 72 */ 73 IINC() {} 74 75 /*** 76 * @param n index of local variable 77 * @param c increment factor 78 */ 79 public IINC(int n, int c) { 80 super(); // Default behaviour of LocalVariableInstruction causes error 81 82 this.opcode = org.apache.bcel.Constants.IINC; 83 this.length = (short)3; 84 85 setIndex(n); // May set wide as side effect 86 setIncrement(c); 87 } 88 89 /*** 90 * Dump instruction as byte code to stream out. 91 * @param out Output stream 92 */ 93 public void dump(DataOutputStream out) throws IOException { 94 if(wide) // Need WIDE prefix ? 95 out.writeByte(org.apache.bcel.Constants.WIDE); 96 97 out.writeByte(opcode); 98 99 if(wide) { 100 out.writeShort(n); 101 out.writeShort(c); 102 } else { 103 out.writeByte(n); 104 out.writeByte(c); 105 } 106 } 107 108 private final void setWide() { 109 if(wide = ((n > org.apache.bcel.Constants.MAX_SHORT) || 110 (Math.abs(c) > Byte.MAX_VALUE))) 111 length = 6; // wide byte included 112 else 113 length = 3; 114 } 115 116 /*** 117 * Read needed data (e.g. index) from file. 118 */ 119 protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException 120 { 121 this.wide = wide; 122 123 if(wide) { 124 length = 6; 125 n = bytes.readUnsignedShort(); 126 c = bytes.readShort(); 127 } else { 128 length = 3; 129 n = bytes.readUnsignedByte(); 130 c = bytes.readByte(); 131 } 132 } 133 134 /*** 135 * @return mnemonic for instruction 136 */ 137 public String toString(boolean verbose) { 138 return super.toString(verbose) + " " + c; 139 } 140 141 /*** 142 * Set index of local variable. 143 */ 144 public final void setIndex(int n) { 145 if(n < 0) 146 throw new ClassGenException("Negative index value: " + n); 147 148 this.n = n; 149 setWide(); 150 } 151 152 /*** 153 * @return increment factor 154 */ 155 public final int getIncrement() { return c; } 156 157 /*** 158 * Set increment factor. 159 */ 160 public final void setIncrement(int c) { 161 this.c = c; 162 setWide(); 163 } 164 165 /*** @return int type 166 */ 167 public Type getType(ConstantPoolGen cp) { 168 return Type.INT; 169 } 170 171 /*** 172 * Call corresponding visitor method(s). The order is: 173 * Call visitor methods of implemented interfaces first, then 174 * call methods according to the class hierarchy in descending order, 175 * i.e., the most specific visitXXX() call comes last. 176 * 177 * @param v Visitor object 178 */ 179 public void accept(Visitor v) { 180 v.visitLocalVariableInstruction(this); 181 v.visitIINC(this); 182 } 183 }

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