Re: Bitcoin scripting language extensions, collaboration requested
Jon Purdy <[email protected]> Wed, 5 Feb 2014 13:43:25 -0800
| Newsgroups | gmane.comp.lang.concatenative |
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| Message-ID | <CAE3FWBv+sZWFiKFv8GkQESS+xkGxspRaysUsaeiexB-kYgDwoA@mail.gmail.com> |
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>
> 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).
In a total higher-order language, you sacrifice less but can still get a
tight upper bound.
Disallowing general recursion by default is a good idea. We could allow the
usual "map", "fold", and "filter" combinators, but place an execution limit
on scripts that would use "fix".
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.
>
Right. I think we need eager evaluation and heavy restrictions on dynamic
allocation.
Mark's mention of "funding" more resource-intensive scripts with more
Bitcoin seems the key notion here. If you want a bigger bigint, you need
deeper pockets.
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.
>
A stack model is largely a convenience. Keep in mind that this is a
bytecode, not a surface language.
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<p><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;">
First-order applicative languages are easy to give exact resource bounds<br>
for if you disallow recursion and dynamic allocation. This has been done<br>
quite successfully already (e.g. SPARK Ada).</blockquote><div><br></div><div>In a total higher-order language, you sacrifice less but can still get a tight upper bound.</div><div><br></div><div>Disallowing general recursion by default is a good idea. We could allow the usual “map”, “fold”, and “filter” combinators, but place an execution limit on scripts that would use “fix”.</div>
<div><br></div><blockquote class="gmail_quote" style="border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;">In contrast, a language like Joy or Enchilada is almost certainly not a<br>
good fit as you'll be stuck with dynamic allocation and (presumably)<br>
garbage collection. Enchilada in particular is also lazy which turns<br>
space usage into a non-local property.<br></blockquote><div><br></div><div>Right. I think we need eager evaluation and heavy restrictions on dynamic allocation.</div><div><br></div><div>Mark’s mention of “funding” more resource-intensive scripts with more Bitcoin seems the key notion here. If you want a bigger bigint, you need deeper pockets.</div>
<div><br></div><blockquote class="gmail_quote" style="border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;">While it is certainly possible to design a stack-based language with<br>
total functions and bounded resource utilization, I don't think it would<br>
offer any benefit over an applicative language for the purpose Mark<br>
describes.<br></blockquote><div><br></div><div>A stack model is largely a convenience. Keep in mind that this is a bytecode, not a surface language.</div><div><br></div></div></div></div>
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