/**
* Collectors that move objects <b>must</b> override this method. It performs the deferred
* scanning of objects which are forwarded during bootstrap of each copying collection. Because of
* the complexities of the collection bootstrap (such objects are generally themselves
* gc-critical), the forwarding and scanning of the objects must be dislocated. It is an error for
* a non-moving collector to call this method.
*
* @param object The forwarded object to be scanned
*/
@Inline
@Override
protected void scanObject(ObjectReference object) {
if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(Immix.immixSpace.inImmixDefragCollection());
super.scanObject(object);
if (MARK_LINE_AT_SCAN_TIME && Space.isInSpace(Immix.IMMIX, object))
Immix.immixSpace.markLines(object);
}
private void scanReferenceSet(TraceLocal trace, Set<ReferenceValue> set) {
for (ReferenceValue value : set) {
ObjectReference referent = value.getObjectValue();
if (trace.isReferentLive(referent)) {
value.processReference(trace);
} else {
value.clear();
}
}
}
/**
* Perform some concurrent collection work.
*
* @param phaseId The unique phase identifier
*/
@Unpreemptible
public void concurrentCollectionPhase(short phaseId) {
if (phaseId == Concurrent.CONCURRENT_CLOSURE) {
if (VM.VERIFY_ASSERTIONS) {
VM.assertions._assert(!Plan.gcInProgress());
}
TraceLocal trace = getCurrentTrace();
while (!trace.incrementalTrace(100)) {
if (group.isAborted()) {
trace.flush();
break;
}
}
if (rendezvous() == 0) {
continueCollecting = false;
if (!group.isAborted()) {
/* We are responsible for ensuring termination. */
if (Options.verbose.getValue() >= 2) Log.writeln("< requesting mutator flush >");
VM.collection.requestMutatorFlush();
if (Options.verbose.getValue() >= 2) Log.writeln("< mutators flushed >");
if (concurrentTraceComplete()) {
continueCollecting = Phase.notifyConcurrentPhaseComplete();
} else {
continueCollecting = true;
Phase.notifyConcurrentPhaseIncomplete();
}
}
}
rendezvous();
return;
}
Log.write("Concurrent phase ");
Log.write(Phase.getName(phaseId));
Log.writeln(" not handled.");
VM.assertions.fail("Concurrent phase not handled!");
}
/**
* GC-time processing of the contained object
*
* @param trace The trace object
*/
public void traceObject(TraceLocal trace) {
if (lastDiscoveryPhase < currentRootDiscoveryPhase) {
value = trace.traceObject(value, true);
lastDiscoveryPhase = currentRootDiscoveryPhase;
}
}