Scoping the stack allocation prototype for C2

[Charlie Gracie]

    Hi Erik, 
 
> It sounds like the high level goal is not "allocate on the stack", but  rather allocate and free objects 
> more efficiently based on compile-time  knowledge about their scoped lifetime. 
 
Yes, you are correct. That is the best way to describe our high-level goal. 
 
> Since I can see so many advantages with this approach, and not really any disadvantages if done right, 
> I wonder if there are any clear reasons not to build it in that (general) way instead.I am curious to hear 
> your thoughts about this. 
>
> If you agree this is probably a better way of achieving the same thing, then I have some ideas how  
> best to implement it that we could discuss.  
> But maybe we should settle on the direction first instead.Perhaps there are some nice quirks with 
> stack allocations that still make them more desirable, even though I can not currently see it. 
 
You have made excellent points about the pros and cons of both solutions, along with Vladimir and others.
Taking all this information into account, we agree that the zone-based approach would satisfy our high-level
goals without as many limitations as the stack based approach.
 
> If you agree this is probably a better way of achieving the same thing,  
> then I have some ideas how best to implement it that we could discuss. 
 
We would appreciate hearing your ideas about how to best implement the zone-based solution. We are
especially interested in your thoughts on how to get started with acquiring a zone and managing it. Having
some guidance on the starting the zone-based approach would help us a lot. 
 
Thanks again for your insightful comments,
Charlie & Nikola