Function BFGetObjectSize

BeefRT/dbg/gc.cpp:836–864

int gMarkTargetMutatorCount = 0;

int BFGetObjectSize(bf::System::Object* obj)
{
// 	auto span = TCGetSpanAt(obj);
// 	int elementSize = Static::sizemap()->ByteSizeForClass(span->sizeclass);
// 	if (elementSize != 0)
// 		return elementSize;
// 	intptr pageSize = (intptr)1 << kPageShift;
// 	int spanSize = pageSize * span->length;
// 	return spanSize;

	const PageID p = reinterpret_cast<uintptr_t>(obj) >> kPageShift;
	size_t cl = Static::pageheap()->GetSizeClassIfCached(p);
	int allocSize = 0;
	if (cl == 0)
	{
		auto span = Static::pageheap()->GetDescriptor(p);
		if (span != NULL)
		{
			cl = span->sizeclass;
			if (cl == 0)
			{
				allocSize = span->length << kPageShift;
			}
		}
	}
	if (cl != 0)
		allocSize = Static::sizemap()->class_to_size(cl);
	return allocSize;
}