Re: Bitcoin scripting language extensions, collaboration requested

"William Tanksley, Jr" <[email protected]> Wed, 5 Feb 2014 13:45:08 -0800
Newsgroups	gmane.comp.lang.concatenative
Message-ID	<CAFTBfO5+KCFbbgHH_R33ZJO8CKwMiCNbHky1GhX2x2hDR1Wz1w@mail.gmail.com>
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John Nowak <[email protected]> wrote:
> Jon Purdy wrote:
>> Concatenative languages have a simpler execution model, for one thing,
>> and are easy to make predictable about resource usage.

> First-order applicative languages are easy to give exact resource bounds
> for if you disallow recursion and dynamic allocation. This has been done
> quite successfully already (e.g. SPARK Ada).

SPARK Ada should be mentioned, and I hope the Bitcoin people have
looked at it (Mark?). However, it gains its abilities not by being
first-order applicative, but rather by having a strong proof language
tied to a decent and well-known programming language with a
non-ambiguous subset specification.

> In contrast, a language like Joy or Enchilada is almost certainly not a
> good fit as you'll be stuck with dynamic allocation and (presumably)
> garbage collection. Enchilada in particular is also lazy which turns
> space usage into a non-local property.

This is true.

> While it is certainly possible to design a stack-based language with
> total functions and bounded resource utilization, I don't think it would
> offer any benefit over an applicative language for the purpose Mark
> describes.

I'm not so sure about that.

> - jn

-Wm

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      <p>John Nowak &lt;[email protected]&gt; wrote:<br>
&gt; Jon Purdy wrote:<br>
&gt;&gt; Concatenative languages have a simpler execution model, for one thing,<br>
&gt;&gt; and are easy to make predictable about resource usage.<br>
<br>
&gt; First-order applicative languages are easy to give exact resource bounds<br>
&gt; for if you disallow recursion and dynamic allocation. This has been done<br>
&gt; quite successfully already (e.g. SPARK Ada).<br>
<br>
SPARK Ada should be mentioned, and I hope the Bitcoin people have<br>
looked at it (Mark?). However, it gains its abilities not by being<br>
first-order applicative, but rather by having a strong proof language<br>
tied to a decent and well-known programming language with a<br>
non-ambiguous subset specification.<br>
<br>
&gt; In contrast, a language like Joy or Enchilada is almost certainly not a<br>
&gt; good fit as you&#39;ll be stuck with dynamic allocation and (presumably)<br>
&gt; garbage collection. Enchilada in particular is also lazy which turns<br>
&gt; space usage into a non-local property.<br>
<br>
This is true.<br>
<br>
&gt; While it is certainly possible to design a stack-based language with<br>
&gt; total functions and bounded resource utilization, I don&#39;t think it would<br>
&gt; offer any benefit over an applicative language for the purpose Mark<br>
&gt; describes.<br>
<br>
I&#39;m not so sure about that.<br>
<br>
&gt; - jn<br>
<br>
-Wm<br>
</p>

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