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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: community-based compiler (was Re: What exactly is the licensing
 situation with GNAT?)
Date: Tue, 18 Nov 2014 16:33:33 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2014-11-18T16:33:33-06:00
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"Luke A. Guest" <laguest@archeia.com> wrote in message 
news:790775817437972682.294390laguest-archeia.com@nntp.aioe.org...
> "Randy Brukardt" <randy@rrsoftware.com> wrote:
>
>> That's not really true with Janus/Ada, as many things (types, compilation
>> units, subprograms) are stored in static tables. That's a left-over from 
>> the
>> early MS-DOS days, where those tables could be paged to disk or stored in
>> "extended" memory rather than taking up limited main memory space. I've 
>> been
>> slowly removing the paging code (it's just a complication that introduces
>> bugs), but the static tables remain for the most part. (Some have become
>> expandable by allocating them en-mass from the heap.)
>>
>> There's still some major heap use for managing expression trees and the
>> symbol table, but there's a lot that doesn't use it.
>
> Given the various input sizes of source you cannot statically define the
> runtime data.

Of course you can. The proportions of data used is proportional to the size 
of the input source, and is fairly consistent between compilation units, so 
there isn't much waste for a maximum-sized unit. Perhaps you're objecting to 
the idea of a maximum-sized unit, but the amount of memory available to the 
compiler is limited, so there's always a practical limit. (Janus/Ada was 
designed to host of small, memory-limited machines; it was never really 
intended to be used on machines with vast amounts of memory. Which is fine, 
because I've never had a machine with vast amounts of memory. :-)

                                           Randy.