void WeakBlock::visit(HeapRootVisitor& heapRootVisitor)
{
// If a block is completely empty, a visit won't have any effect.
if (isEmpty())
return;
// If this WeakBlock doesn't belong to a MarkedBlock, we won't even be here.
ASSERT(m_markedBlock);
// We only visit after marking.
ASSERT(m_markedBlock->isMarkedOrRetired());
SlotVisitor& visitor = heapRootVisitor.visitor();
for (size_t i = 0; i < weakImplCount(); ++i) {
WeakImpl* weakImpl = &weakImpls()[i];
if (weakImpl->state() != WeakImpl::Live)
continue;
WeakHandleOwner* weakHandleOwner = weakImpl->weakHandleOwner();
if (!weakHandleOwner)
continue;
const JSValue& jsValue = weakImpl->jsValue();
if (m_markedBlock->isMarkedOrNewlyAllocated(jsValue.asCell()))
continue;
if (!weakHandleOwner->isReachableFromOpaqueRoots(Handle<Unknown>::wrapSlot(&const_cast<JSValue&>(jsValue)), weakImpl->context(), visitor))
continue;
heapRootVisitor.visit(&const_cast<JSValue&>(jsValue));
}
}
void WeakBlock::specializedVisit(ContainerType& container, SlotVisitor& visitor)
{
HeapVersion markingVersion = visitor.markingVersion();
size_t count = weakImplCount();
for (size_t i = 0; i < count; ++i) {
WeakImpl* weakImpl = &weakImpls()[i];
if (weakImpl->state() != WeakImpl::Live)
continue;
WeakHandleOwner* weakHandleOwner = weakImpl->weakHandleOwner();
if (!weakHandleOwner)
continue;
JSValue jsValue = weakImpl->jsValue();
if (container.isMarkedConcurrently(markingVersion, jsValue.asCell()))
continue;
if (!weakHandleOwner->isReachableFromOpaqueRoots(Handle<Unknown>::wrapSlot(&const_cast<JSValue&>(jsValue)), weakImpl->context(), visitor))
continue;
visitor.appendUnbarriered(jsValue);
}
}
void WeakBlock::visitLiveWeakImpls(HeapRootVisitor& heapRootVisitor)
{
// If a block is completely empty, a visit won't have any effect.
if (!m_sweepResult.isNull() && m_sweepResult.blockIsFree)
return;
SlotVisitor& visitor = heapRootVisitor.visitor();
for (size_t i = 0; i < weakImplCount(); ++i) {
WeakImpl* weakImpl = &weakImpls()[i];
if (weakImpl->state() != WeakImpl::Live)
continue;
const JSValue& jsValue = weakImpl->jsValue();
if (Heap::isMarked(jsValue.asCell()))
continue;
WeakHandleOwner* weakHandleOwner = weakImpl->weakHandleOwner();
if (!weakHandleOwner)
continue;
if (!weakHandleOwner->isReachableFromOpaqueRoots(Handle<Unknown>::wrapSlot(&const_cast<JSValue&>(jsValue)), weakImpl->context(), visitor))
continue;
heapRootVisitor.visit(&const_cast<JSValue&>(jsValue));
}
}
