/**
* Is the specified object live?
*
* @param object The object.
* @return True if the object is live.
*/
@Inline
public boolean isLive(ObjectReference object) {
Space space = Space.getSpaceForObject(object);
if (space == Plan.loSpace) return Plan.loSpace.isLive(object);
else if (space == Plan.ploSpace) return Plan.ploSpace.isLive(object);
else if (Plan.USE_CODE_SPACE && space == Plan.smallCodeSpace)
return Plan.smallCodeSpace.isLive(object);
else if (Plan.USE_CODE_SPACE && space == Plan.largeCodeSpace)
return Plan.largeCodeSpace.isLive(object);
else if (space == null) {
if (VM.VERIFY_ASSERTIONS) {
Log.write("space failure: ");
Log.writeln(object);
}
}
return true;
}
/**
* Return the expected reference count. For non-reference counting collectors this becomes a
* true/false relationship.
*
* @param object The object to check.
* @param sanityRootRC The number of root references to the object.
* @return The expected (root excluded) reference count.
*/
public int sanityExpectedRC(ObjectReference object, int sanityRootRC) {
Space space = Space.getSpaceForObject(object);
// Nursery
if (space == Gen.nurserySpace) {
return SanityChecker.DEAD;
}
// Immortal spaces
if (space == Gen.immortalSpace || space == Gen.vmSpace) {
return space.isReachable(object) ? SanityChecker.ALIVE : SanityChecker.DEAD;
}
// Mature space (nursery collection)
if (VM.activePlan.global().isCurrentGCNursery()) {
return SanityChecker.UNSURE;
}
// Mature space (full heap collection)
return space.isReachable(object) ? SanityChecker.ALIVE : SanityChecker.DEAD;
}
/**
* Return the expected reference count. For non-reference counting collectors this becomes a
* true/false relationship.
*
* @param object The object to check.
* @param sanityRootRC The number of root references to the object.
* @return The expected (root excluded) reference count.
*/
public int sanityExpectedRC(ObjectReference object, int sanityRootRC) {
Space space = Space.getSpaceForObject(object);
return space.isReachable(object) ? SanityChecker.ALIVE : SanityChecker.DEAD;
}
/**
* Is the specified object reachable? Used for GC Trace
*
* @param object The object.
* @return True if the object is live.
*/
@Inline
public boolean isReachable(ObjectReference object) {
return Space.getSpaceForObject(object).isReachable(object);
}
