/*
* 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;
/**
* Represents a constant int operand.
*
* @see OPT_Operand
*/
public final class OPT_IntConstantOperand extends OPT_ConstantOperand {
/**
* Value of this operand.
*/
public final int value;
/**
* Constructs a new int constant operand with the specified value.
* Type will be determined by value.
*
* @param v value
*/
public OPT_IntConstantOperand(int v) {
value = v;
}
/**
* Return the {@link VM_TypeReference} of the value represented by
* the operand. For int constants we speculate on the type
* dependenent on the constant value.
*
* @return a speculation on the type of the value represented by the
* operand.
*/
public VM_TypeReference getType() {
if ((value == 0) || (value == 1)) {
return VM_TypeReference.Boolean;
} else if (-128 <= value && value <= 127) {
return VM_TypeReference.Byte;
} else if (-32768 <= value && value <= 32767) {
return VM_TypeReference.Short;
} else {
return VM_TypeReference.Int;
}
}
/**
* Does the operand represent a value of an int-like data type?
*
* @return <code>true</code>
*/
public boolean isIntLike() {
return true;
}
/**
* Does the operand represent a value of an int data type?
*
* @return <code>true</code>
*/
public boolean isInt() {
return true;
}
/**
* 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_IntConstantOperand(value);
}
/**
* Return the lower 8 bits (as an int) of value
*/
public int lower8() {
return OPT_Bits.lower8(value);
}
/**
* Return the lower 16 bits (as an int) of value
*/
public int lower16() {
return OPT_Bits.lower16(value);
}
/**
* Return the upper 16 bits (as an int) of value
*/
public int upper16() {
return OPT_Bits.upper16(value);
}
/**
* Return the upper 24 bits (as an int) of value
*/
public int upper24() {
return OPT_Bits.upper24(value);
}
/**
* 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_IntConstantOperand) && (value == ((OPT_IntConstantOperand) op).value);
}
public boolean equals(Object o) {
return (o instanceof OPT_IntConstantOperand) && (value == ((OPT_IntConstantOperand) o).value);
}
public int hashCode() {
return value;
}
/**
* Returns the string representation of this operand.
*
* @return a string representation of this operand.
*/
public String toString() {
if (value > 0xffff || value < -0xffff) {
return "0x" + Integer.toHexString(value);
} else {
return Integer.toString(value);
}
}
}