/*
* 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.classloader.VM_TypeReference;
import org.jikesrvm.compilers.opt.OPT_Bits;
import org.vmmagic.unboxed.Offset;
/**
* Represents a constant long operand.
*
* @see OPT_Operand
*/
public final class OPT_LongConstantOperand extends OPT_ConstantOperand {
/**
* Value of this operand.
*/
public long value;
/**
* Offset in JTOC where this long constant lives. (0 for constants
* obtained from constant folding)
* //KV: is this field still necessary
*/
public Offset offset;
/**
* Constructs a new long constant operand with the specified value.
*
* @param v value
*/
public OPT_LongConstantOperand(long v) {
value = v;
offset = Offset.zero();
}
/**
* Constructs a new long constant operand with the specified value and JTOC offset.
* //KV: is this method still necessary
* @param v value
* @param i offset in the jtoc
*/
public OPT_LongConstantOperand(long v, Offset i) {
value = v;
offset = i;
}
/**
* Return the {@link VM_TypeReference} of the value represented by the operand.
*
* @return VM_TypeReference.Long
*/
public VM_TypeReference getType() {
return VM_TypeReference.Long;
}
/**
* Does the operand represent a value of the long data type?
*
* @return <code>true</code>
*/
public boolean isLong() {
return true;
}
/**
* Return the lower 32 bits (as an int) of value
*/
public int lower32() {
return OPT_Bits.lower32(value);
}
/**
* Return the upper 32 bits (as an int) of value
*/
public int upper32() {
return OPT_Bits.upper32(value);
}
/**
* Return a new operand that is semantically equivalent to <code>this</code>.
*
* @return a copy of <code>this</code>
*/
public OPT_Operand copy() {
return new OPT_LongConstantOperand(value, offset);
}
/**
* 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_LongConstantOperand) && (value == ((OPT_LongConstantOperand) op).value);
}
/**
* Returns the string representation of this operand.
*
* @return a string representation of this operand.
*/
public String toString() {
return Long.toString(value) + "L";
}
}