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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 57 /*** 58 * Equality of instructions isn't clearly to be defined. You might 59 * wish, for example, to compare whether instructions have the same 60 * meaning. E.g., whether two INVOKEVIRTUALs describe the same 61 * call.<br>The DEFAULT comparator however, considers two instructions 62 * to be equal if they have same opcode and point to the same indexes 63 * (if any) in the constant pool or the same local variable index. Branch 64 * instructions must have the same target. 65 * 66 * @see Instruction 67 * @version $Id: InstructionComparator.java,v 1.3 2002/10/11 20:33:07 mdahm Exp $ 68 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 69 */ 70 public interface InstructionComparator { 71 public static final InstructionComparator DEFAULT = 72 new InstructionComparator() { 73 public boolean equals(Instruction i1, Instruction i2) { 74 if(i1.opcode == i2.opcode) { 75 if(i1 instanceof Select) { 76 InstructionHandle[] t1 = ((Select)i1).getTargets(); 77 InstructionHandle[] t2 = ((Select)i2).getTargets(); 78 79 if(t1.length == t2.length) { 80 for(int i = 0; i < t1.length; i++) { 81 if(t1[i] != t2[i]) { 82 return false; 83 } 84 } 85 86 return true; 87 } 88 } else if(i1 instanceof BranchInstruction) { 89 return ((BranchInstruction)i1).target == 90 ((BranchInstruction)i2).target; 91 } else if(i1 instanceof ConstantPushInstruction) { 92 return ((ConstantPushInstruction)i1).getValue(). 93 equals(((ConstantPushInstruction)i2).getValue()); 94 } else if(i1 instanceof IndexedInstruction) { 95 return ((IndexedInstruction)i1).getIndex() == 96 ((IndexedInstruction)i2).getIndex(); 97 } else if(i1 instanceof NEWARRAY) { 98 return ((NEWARRAY)i1).getTypecode() == ((NEWARRAY)i2).getTypecode(); 99 } else { 100 return true; 101 } 102 } 103 104 return false; 105 } 106 }; 107 108 public boolean equals(Instruction i1, Instruction i2); 109 }

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