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 * IINC - Increment local variable by constant 65 * 66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 67 */ 68 public class IINC extends LocalVariableInstruction { 69 private boolean wide; 70 private int c; 71 72 /** 73 * Empty constructor needed for the Class.newInstance() statement in 74 * Instruction.readInstruction(). Not to be used otherwise. 75 */ 76 IINC() {} 77 78 /** 79 * @param n index of local variable 80 * @param c increment factor 81 */ 82 public IINC(int n, int c) { 83 super(); // Default behaviour of LocalVariableInstruction causes error 84 85 this.opcode = com.sun.org.apache.bcel.internal.Constants.IINC; 86 this.length = (short)3; 87 88 setIndex(n); // May set wide as side effect 89 setIncrement(c); 90 } 91 92 /** 93 * Dump instruction as byte code to stream out. 94 * @param out Output stream 95 */ 96 public void dump(DataOutputStream out) throws IOException { 97 if(wide) // Need WIDE prefix ? 98 out.writeByte(com.sun.org.apache.bcel.internal.Constants.WIDE); 99 100 out.writeByte(opcode); 101 102 if(wide) { 103 out.writeShort(n); 104 out.writeShort(c); 105 } else { 106 out.writeByte(n); 107 out.writeByte(c); 108 } 109 } 110 111 private final void setWide() { 112 if(wide = ((n > com.sun.org.apache.bcel.internal.Constants.MAX_SHORT) || 113 (Math.abs(c) > Byte.MAX_VALUE))) 114 length = 6; // wide byte included 115 else 116 length = 3; 117 } 118 119 /** 120 * Read needed data (e.g. index) from file. 121 */ 122 protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException 123 { 124 this.wide = wide; 125 126 if(wide) { 127 length = 6; 128 n = bytes.readUnsignedShort(); 129 c = bytes.readShort(); 130 } else { 131 length = 3; 132 n = bytes.readUnsignedByte(); 133 c = bytes.readByte(); 134 } 135 } 136 137 /** 138 * @return mnemonic for instruction 139 */ 140 public String toString(boolean verbose) { 141 return super.toString(verbose) + " " + c; 142 } 143 144 /** 145 * Set index of local variable. 146 */ 147 public final void setIndex(int n) { 148 if(n < 0) 149 throw new ClassGenException("Negative index value: " + n); 150 151 this.n = n; 152 setWide(); 153 } 154 155 /** 156 * @return increment factor 157 */ 158 public final int getIncrement() { return c; } 159 160 /** 161 * Set increment factor. 162 */ 163 public final void setIncrement(int c) { 164 this.c = c; 165 setWide(); 166 } 167 168 /** @return int type 169 */ 170 public Type getType(ConstantPoolGen cp) { 171 return Type.INT; 172 } 173 174 /** 175 * Call corresponding visitor method(s). The order is: 176 * Call visitor methods of implemented interfaces first, then 177 * call methods according to the class hierarchy in descending order, 178 * i.e., the most specific visitXXX() call comes last. 179 * 180 * @param v Visitor object 181 */ 182 public void accept(Visitor v) { 183 v.visitLocalVariableInstruction(this); 184 v.visitIINC(this); 185 } 186 }