bool Heap::collectIfNecessaryOrDefer()
{
if (m_deferralDepth)
return false;
if (!shouldCollect())
return false;
collect(DoNotSweep);
return true;
}
void Heap::reportExtraMemoryCostSlowCase(size_t cost)
{
// Our frequency of garbage collection tries to balance memory use against speed
// by collecting based on the number of newly created values. However, for values
// that hold on to a great deal of memory that's not in the form of other JS values,
// that is not good enough - in some cases a lot of those objects can pile up and
// use crazy amounts of memory without a GC happening. So we track these extra
// memory costs. Only unusually large objects are noted, and we only keep track
// of this extra cost until the next GC. In garbage collected languages, most values
// are either very short lived temporaries, or have extremely long lifetimes. So
// if a large value survives one garbage collection, there is not much point to
// collecting more frequently as long as it stays alive.
didAllocate(cost);
if (shouldCollect())
collect(DoNotSweep);
}
