Re: [proposal] Type metatables per environment

[Miles Bader <miles@...>]

Daurnimator <quae@daurnimator.com> writes:
>> Soooo what are the details?  How does the compiler implement this?
>> How would it impact performance?
>>
>> Do you mean that, for instance, OP_GETTABLE would need a 4th argument
>> to pass in _ENV? ... and _every_ indexing operation (maybe the most
>> common operation in Lua bytecode) would then need to get and pass in
>> _ENV?
>
> A not too odd assumption to make is that the current environment (ie, _ENV)
> is always available for a function/VM instruction.

Maybe so, but in the 5.2 VM, access to _ENV always seems to be
explicit, not implicit ... _ENV is treated like any other local
variable in the top-level chunk.

-Miles

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