Sep 27 meeting notes
brendan at mozilla.com
Thu Sep 29 11:48:04 PDT 2011
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.
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