//
// nosplit because it is used during write barriers and must not be preempted.
//
//go:nosplit
func (span *mspan) typePointersOfUnchecked(addr uintptr) typePointers {
	const doubleCheck = false
	if doubleCheck && span.objBase(addr) != addr {
		print("runtime: addr=", addr, " base=", span.objBase(addr), "\n")
		throw("typePointersOfUnchecked consisting of non-base-address for object")
	}

	spc := span.spanclass

	// point, the GC will observe the new bitmap.
	s.largeType.PtrBytes = uintptr(ptr) - base + typ.PtrBytes

	// Double-check that the bitmap was written out correctly.
	const doubleCheck = false
	if doubleCheck {
		doubleCheckHeapPointersInterior(uintptr(ptr), uintptr(ptr), typ.Size_, typ.Size_, typ, &s.largeType, s)
	}
}

type writeUserArenaHeapBits struct {