| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| package com.sun.org.apache.bcel.internal.generic; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache BCEL" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache BCEL", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| /** |
| * Equality of instructions isn't clearly to be defined. You might |
| * wish, for example, to compare whether instructions have the same |
| * meaning. E.g., whether two INVOKEVIRTUALs describe the same |
| * call.<br>The DEFAULT comparator however, considers two instructions |
| * to be equal if they have same opcode and point to the same indexes |
| * (if any) in the constant pool or the same local variable index. Branch |
| * instructions must have the same target. |
| * |
| * @see Instruction |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| */ |
| public interface InstructionComparator { |
| public static final InstructionComparator DEFAULT = |
| new InstructionComparator() { |
| public boolean equals(Instruction i1, Instruction i2) { |
| if(i1.opcode == i2.opcode) { |
| if(i1 instanceof Select) { |
| InstructionHandle[] t1 = ((Select)i1).getTargets(); |
| InstructionHandle[] t2 = ((Select)i2).getTargets(); |
| |
| if(t1.length == t2.length) { |
| for(int i = 0; i < t1.length; i++) { |
| if(t1[i] != t2[i]) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| } else if(i1 instanceof BranchInstruction) { |
| return ((BranchInstruction)i1).target == |
| ((BranchInstruction)i2).target; |
| } else if(i1 instanceof ConstantPushInstruction) { |
| return ((ConstantPushInstruction)i1).getValue(). |
| equals(((ConstantPushInstruction)i2).getValue()); |
| } else if(i1 instanceof IndexedInstruction) { |
| return ((IndexedInstruction)i1).getIndex() == |
| ((IndexedInstruction)i2).getIndex(); |
| } else if(i1 instanceof NEWARRAY) { |
| return ((NEWARRAY)i1).getTypecode() == ((NEWARRAY)i2).getTypecode(); |
| } else { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| }; |
| |
| public boolean equals(Instruction i1, Instruction i2); |
| } |