Re: Outers, fields and locals

On Mon, Mar 8, 2010 at 5:55 AM, Darius Bacon <[email protected]> wrote:
> Thomas Leonard <[email protected]> wrote:
>> EvalContext holds three arrays:
>>
>>     private final Object[] myLocals;
>>     private final Object[] myFields;
>>     private final Slot[] myOuters;
>>
>> What's the difference between these? My current guess is:
>>
>> - locals is a new set of bindings created each time you invoke a
>> method and includes the local variables and the method's arguments.
>> - fields are the values that were in scope when the object was defined
>> and which are used in the object and which aren't in safeScope.
>> - outers is everything else.
>
> Almost. IIRC, outers are module-level and top-level variables. This
> reduces the amount of copying needed to create a closure; if we had
> only myLocals and myFields, then myFields would usually be much
> larger. The outers arrays can be shared, one per module.
>
> (It's been most of a decade since I dealt with this code; you should
> get someone who still knows it better.)

Hi Darius, your memory remains correct. That's why.

>
> Darius
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-- 
Text by me above is hereby placed in the public domain

    Cheers,
    --MarkM