/
ObjectValue.java
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/
ObjectValue.java
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/*
* 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.mmtk.harness.lang.runtime;
import org.mmtk.harness.lang.ast.Type;
import org.mmtk.plan.TraceLocal;
import org.vmmagic.unboxed.ObjectReference;
/**
* Expression consisting of a simple object value
*/
public class ObjectValue extends Value {
public static final ObjectValue NULL = new ObjectValue();
/**
* The reference to the heap object
*
* Not final because it may change during GC
*/
private ObjectReference value;
/**
* Construct an initially null object value
*/
public ObjectValue() {
this(ObjectReference.nullReference());
}
/**
* An object value with the given initial value
* @param value
*/
public ObjectValue(ObjectReference value) {
this.value = value;
}
/**
* Get this value as an object.
*/
public ObjectReference getObjectValue() {
return value;
}
/**
* Get this value as a boolean.
*/
public boolean getBoolValue() {
return !value.isNull();
}
/**
* Prints the address of the object.
*/
@Override
public String toString() {
if (value.isNull()) {
return "null";
}
return value.toString();
}
/**
* The type of this value
*/
@Override
public Type type() {
return Type.OBJECT;
}
/**
* GC-time processing of the contained object
*/
public void traceObject(TraceLocal trace) {
value = trace.traceObject(value, true);
}
/**
* Object equality.
*/
@Override
public boolean equals(Object other) {
return (other instanceof ObjectValue && value.toAddress().EQ(((ObjectValue)other).value.toAddress()));
}
@Override
public int hashCode() {
return value.toAddress().hashCode();
}
}