/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.opt.ir;
import org.jikesrvm.VM;
/**
* Represents a branch target.
*
* @see OPT_Operand
*/
public final class OPT_BranchOperand extends OPT_Operand {
/**
* Target of this branch.
*/
public OPT_Instruction target;
/**
* Construct a new branch operand with the given target.
* <STRONG> Precondition: </STRONG> targ must be a Label instruction.
*
* @param targ target of branch
*/
public OPT_BranchOperand(OPT_Instruction targ) {
if (VM.VerifyAssertions) VM._assert(Label.conforms(targ));
target = targ;
}
/**
* Returns a copy of this branch operand.
*
* @return a copy of this operand
*/
public OPT_Operand copy() {
return new OPT_BranchOperand(target);
}
/**
* Are two operands semantically equivalent?
*
* @param op other operand
* @return <code>true</code> if <code>this</code> and <code>op</code>
* are semantically equivalent or <code>false</code>
* if they are not.
*/
public boolean similar(OPT_Operand op) {
return (op instanceof OPT_BranchOperand) && (target == ((OPT_BranchOperand) op).target);
}
/**
* Returns the string representation of this operand.
*
* @return a string representation of this operand.
*/
public String toString() {
return "LABEL" + Label.getBlock(target).block.getNumber();
}
}