print golang type gcdata

gcdata.go

func TestAABB(t *testing.T) {
	t.Logf("size of map = %d", unsafe.Sizeof(map[int]int{}))
	var a any = gsdb.DbUser{}
	var typ = reflectutil.TypeOf(a)
	var n = (int(typ.PtrBytes)/8 + 7) / 8
	var sb strings.Builder
	var ones = 0
	for i := 0; i < n; i++ {
		var ptr = unsafe.Add(unsafe.Pointer(typ.GCData), i)
		var v = *(*uint8)(ptr)
		ones += bits.OnesCount8(v)
		fmt.Fprintf(&sb, "%08b", bits.Reverse8(v))
	}
	t.Logf("%s %d GCData: %s", reflect.TypeOf(a).String(), ones, sb.String())
}