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devel / comp.lang.prolog / Re: 50 Years of Prolog Nonsense

Re: 50 Years of Prolog Nonsense

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Subject: Re: 50 Years of Prolog Nonsense
From: burse...@gmail.com (Mostowski Collapse)
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by: Mostowski Collapse - Sun, 24 Apr 2022 12:32 UTC

There are many libraries that use meta calls. For example
Bart Demoen et al. “Tor” and Ulrich Neumerkels “indexing dif”:

Tor: Extensible Search with Hookable Disjunction
https://www.swi-prolog.org/pack/list?p=tor

Many Prolog programs are unnecessarily impure
https://arxiv.org/abs/1607.01590

But the issue needs of course be also examined for call/n
and not only call/1. Currently Dogelog Player doesn’t have call/n,
only call/1, so I don’t know. I also don’t know why it doesn’t

work in formerly Jekejeke Prolog or in SWI-Prolog. In SWI-Prolog
if you create a temporary clause, last call optimization could skip
it, but you need also a mechanism to garbage collect it.

In formerly Jekejeke Prolog I create a temporary half clause,
only the body of a clause. I thought I made it so that it gets skip
and garbage collected, maybe there is a bug somewhere.

Mostowski Collapse schrieb am Samstag, 23. April 2022 um 22:57:29 UTC+2:
> This could run for ever:
>
> ?- A=(1=1, call(A)), A.
> But so far I find:
>
> SWI Prolog: Fail ✗
> SICStus Prolog: Pass ✓
> Formerly Jekejeke Prolog: Fail ✗
> Dogelog Player: Pass ✓
> Scryer Prolog: Fail ✗
>
> Maybe I can bring the same from Dogelog Player to formerly Jekejeke
> Prolog as well? To see the Scryer Prolog Fail, you need to watch the
> memory growing and growing.
>
> The other Prolog systems that do Pass have constant memory.

Subject	Author
50 Years of Prolog Nonsense	Mostowski Collapse