// The return values are unused but useful to see in panic tracebacks.
func cgoCheckUnknownPointer(p unsafe.Pointer, msg string) (base, i uintptr) {
	if inheap(uintptr(p)) {
		b, span, _ := findObject(uintptr(p), 0, 0)
		base = b
		if base == 0 {
			return
		}
		tp := span.typePointersOfUnchecked(base)
		for {
			var addr uintptr
			if tp, addr = tp.next(base + span.elemsize); addr == 0 {

//
//go:nosplit
func gcTestPointerClass(p unsafe.Pointer) string {
	p2 := uintptr(noescape(p))
	gp := getg()
	if gp.stack.lo <= p2 && p2 < gp.stack.hi {
		return "stack"
	}
	if base, _, _ := findObject(p2, 0, 0); base != 0 {
		return "heap"
	}
	for _, datap := range activeModules() {
		if datap.data <= p2 && p2 < datap.edata || datap.noptrdata <= p2 && p2 < datap.enoptrdata {
			return "data"
		}

		// GC-related invariants as markrootSpans in any
		// situation where it's possible that markrootSpans
		// has already run but mark termination hasn't yet.
		if gcphase != _GCoff {
			base, span, _ := findObject(uintptr(p), 0, 0)
			mp := acquirem()
			gcw := &mp.p.ptr().gcw
			// Mark everything reachable from the object
			// so it's retained for the finalizer.
			if !span.spanclass.noscan() {