Sep 27 meeting notes

[Brendan Eich]

On Sep 29, 2011, at 7:46 PM, Allen Wirfs-Brock wrote:

> Just pointing out that not using const properties doesn't mean that the need for a const read barrier on every property access. Without doing closed world whole program analysis every property [[Get]] has to account for the possibility that it may be accessing an uninitialized const property.  It may be that an implementation can find a way to fold this check into an initial fast-path guard.

That analysis/guard must exist due to getters already.


>  By introducing such a semantics we are adding to the complexity of every [[Get]].
> 
> This is different form the read barrier for lexical const declaration which can be lexical name specific within a lexically bounded scope.

Right.

/be