Just a follow-up to recent thread.
Suppose that we have new object format which supports multiple memory regions. I.e. eden space old space pinned space ... and immutable space
so, instead of adding a flag per object whether its immutable or not, and then check this flag every time there is a write attempt, we could simply let hardware handle this. And immutable space is a memory region with read-only access, So once placed & sealed , any attempt to write, we lead to a hardware exception, which can be nicely handled :)
So, we will have a single entry point for all write access , and don't need to spread an immutability logic all over the places. And of course hardware 'check if memory is writeable' is much faster than software one.
What you think?