/**
* Store a value into a reference field of an object.
*
* @param object The object to store the field of.
* @param index The field index.
* @param value The value to store.
*/
public void storeReferenceField(ObjectReference object, int index, ObjectReference value) {
int limit = ObjectModel.getRefs(object);
if (Trace.isEnabled(Item.STORE) || ObjectModel.isWatched(object)) {
Trace.printf(
Item.STORE,
"[%s].object[%d/%d] = %s",
ObjectModel.getString(object),
index,
limit,
value.toString());
}
check(!object.isNull(), "Object can not be null");
check(index >= 0, "Index must be non-negative");
check(index < limit, "Index " + index + " out of bounds " + limit);
Address referenceSlot = ObjectModel.getRefSlot(object, index);
if (ActivePlan.constraints.needsWriteBarrier()) {
context.writeBarrier(object, referenceSlot, value, null, null, Plan.AASTORE_WRITE_BARRIER);
if (gcEveryWB) {
gc();
}
} else {
referenceSlot.store(value);
}
}
/** Prints the address of the object. */
@Override
public String toString() {
if (value.isNull()) {
return "null";
}
return value.toString();
}
/**
* Store a value into the data field of an object.
*
* @param object The object to store the field of.
* @param index The field index.
* @param value The value to store.
*/
public void storeDataField(ObjectReference object, int index, int value) {
int limit = ObjectModel.getDataCount(object);
check(!object.isNull(), "Object can not be null");
check(index >= 0, "Index must be non-negative");
check(index < limit, "Index " + index + " out of bounds " + limit);
Address ref = ObjectModel.getDataSlot(object, index);
ref.store(value);
Trace.trace(Item.STORE, "%s.[%d] = %d", object.toString(), index, value);
}
/**
* Load and return the value of a reference field of an object.
*
* @param object The object to load the field of.
* @param index The field index.
*/
public ObjectReference loadReferenceField(ObjectReference object, int index) {
int limit = ObjectModel.getRefs(object);
check(!object.isNull(), "Object can not be null");
check(index >= 0, "Index must be non-negative");
check(index < limit, "Index " + index + " out of bounds " + limit);
Address referenceSlot = ObjectModel.getRefSlot(object, index);
ObjectReference result;
if (ActivePlan.constraints.needsReadBarrier()) {
result = context.readBarrier(object, referenceSlot, null, null, Plan.AASTORE_WRITE_BARRIER);
} else {
result = referenceSlot.loadObjectReference();
}
Trace.trace(
Item.LOAD,
"[%s].object[%d] returned [%s]",
ObjectModel.getString(object),
index,
result.toString());
return result;
}