1pub const FLAG_MARK: u8 = 0x01;
2pub const FLAG_STICKY: u8 = 0x02;
3pub const FLAG_MUT: u8 = 0x04;
4pub const FLAG_TRACED: u8 = 0x08;
5
6#[macro_export]
7macro_rules! is_bit_set {
8 ($val:expr, $bit:expr) => {{ ($val & $bit) != 0 }};
9}
10
11#[macro_export]
12macro_rules! set_bit {
13 ($val:expr, $bit:expr) => {{
14 $val |= $bit;
15 }};
16}
17
18#[macro_export]
19macro_rules! clear_bit {
20 ($val:expr, $bit:expr) => {{
21 if is_bit_set!($val, $bit) {
22 $val ^= $bit;
23 }
24 }};
25}
26
27pub fn is_live(flag: u8) -> bool {
28 is_bit_set!(flag, FLAG_MARK | FLAG_STICKY)
29}
30
31pub fn is_marked(flag: u8) -> bool {
32 is_bit_set!(flag, FLAG_MARK)
33}
34
35pub fn is_mutable(flag: u8) -> bool {
36 is_bit_set!(flag, FLAG_MUT)
37}
38
39pub fn is_traced(flag: u8) -> bool {
40 is_bit_set!(flag, FLAG_TRACED)
41}