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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
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* distribution.
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* 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.
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* 4. The names "Apache" and "Apache Software Foundation" and
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* 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
*
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
* @version $Id: InstructionComparator.java,v 1.3 2007-07-19 04:34:46 ofung Exp $
* @author M. Dahm
*/
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);
}