[PATCH 1/9] vbscript: Add script TypeInfo stub.

[Jacek Caban]

Hi Gabriel,

On 10/16/19 1:52 PM, Gabriel Ivăncescu wrote:
> And the context changes are not reflected by earlier typeinfos, so the 
> duplication is necessary, each of them is "frozen" at the moment it is 
> retrieved


I'm not convinced. Note that we currently store functions and variables 
in lists and always add new members to the beginning of the list. It 
means that you may treat each element of the list (head is the most 
interesting element) as an immutable (or "frozen") snapshot of current 
context. Storing current head of variables and functions lists in 
TypeInfo should be enough, AFAICS.


If you need something more sophisticated, it should be possible to 
change how we store the context in a way that we could retrieve such a 
snapshot easily. I can imagine compiler storing global functions and 
variables in a separate collection that is immutable. It would probably 
have to be recreated whenever something changes (which is rare), but it 
could be efficiently use across vbscript.


Thanks,

Jacek