BarrierSelector #[repr(u8)]

[wenyuzhao]

https://github.com/mmtk/mmtk-core/blob/master/src/plan/barriers.rs#L22

Should BarrierSelector be decorated with #[repr(u8)] to safely convert to unique u8 values?

[qinsoon]

Yes. We should. If we have more than 256 variants in the enum, the casting to u8 will wrap around.