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<H1>[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: Bruce Sterling on Virtual Community goals</LI>
<LI><em>From</em>: "Jon A. Lambert" <<A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A>></LI>
<LI><em>Date</em>: Wed, 21 Oct 1998 20:29:26 -5</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
On 20 Oct 98, Marc Hernandez wrote:
> On Tue, 20 Oct 1998, Jon A. Lambert wrote:
>
> }Stack-based or psuedo-register based?
>
> Does a psuedo register system create any real benefit? They are
> still implemented as memory locations AND have the additional benefit of
> having to be saved and loaded (unless there is some nice benefit I didnt
> think of (which is very possible (like reading lisp?))).
>
IIRC, Java makes use of 4 psuedo-registers in addition to a stack.
It's a mechanism to save instructions executing some arithmetic
operations and some loop constructs. It also makes native code
generation more straight forward. It's really an optimization issue.
Reading and writing to a pseudo-register will always be cheaper
than pushing and popping a stack. There's no stack pointer to
increment or decrement. :)
> }Details:
>
> }Primitive data types to be represented.
> }Complex data types (object).
>
> Why?
Will the language be oject-oriented?.
> }Label generation.
>
> hmmm. Isnt this only for the assemblers benefit? Why not skip to
> memory locations?
Well there may be some benefits to decompilation and/or pretty
printing, if that's a desired feature. Yes, you can easily forego
label generation and use offsets.
> }Symbolic storage.
> }Variable storage.
> }Type conversions/promotions.
>
> Isnt this basically a compile time issue?
>
It depends. If a compiler supports very weak typing, type
conversions must be done at run time.
A sample, (see Coolmud)
var A;
A = "string";
A = 1.57
And there are type promotions to consider:
float A;
int B;
A = B * 1.4;
Is B temporarily promoted to a float at runtime?
> }Booleans/conditionals.
>
> necessary for looping/control. Doesnt have to be true booleans.
Right. I actually meant boolean operations like (x AND NOT y).
> }Operator precedence.
>
> operator precedence is taken care of by the compiler (else
> expression evaluators would be very easy to right :-) ).
>
Nod.
> }Unique ID's are crucial to object manipulation. For instance the
> }interface to a ROM drop in might be object/room vnums. Those objects
> }would have no methods of course. I would think the specifications
> }for "object" would be a custom interface. A generic way to descibe
> }an object to the VM would be needed.
>
> Such as leave it as 'memory' and let the language impose its own
> structure to it. (like the fact that there are no 'signed' integers to
> the processor. Just sets of bits with operations on them. We impose the
> fact that _these_ four bytes are a signed integer and thus we use
> SignedAdd etc).
I'm not sure. How does the language address the object Player or
the attributes of object Player?
--
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<LI><STRONG><A NAME="00285" HREF="msg00285.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></STRONG>
<UL><LI><EM>From:</EM> "Jon A. Lambert" <jlsysinc#ix,netcom.com></LI></UL></LI>
<LI><STRONG><A NAME="00288" HREF="msg00288.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></STRONG>
<UL><LI><EM>From:</EM> Marc Hernandez <marc#jb,com></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</STRONG>, <EM>(continued)</EM>
<ul compact>
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<LI><strong><A NAME="00328" HREF="msg00328.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Thu 22 Oct 1998, 01:30 GMT
</LI>
</ul>
<LI><strong><A NAME="00289" HREF="msg00289.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 21 Oct 1998, 04:53 GMT
</LI>
</ul>
</ul>
<LI><strong><A NAME="00285" HREF="msg00285.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 21 Oct 1998, 03:10 GMT
<UL>
<LI><strong><A NAME="00288" HREF="msg00288.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Marc Hernandez <a href="mailto:marc#jb,com">marc#jb,com</a>, Wed 21 Oct 1998, 04:50 GMT
<UL>
<LI><strong><A NAME="00324" HREF="msg00324.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Thu 22 Oct 1998, 00:32 GMT
</LI>
</UL>
</LI>
</UL>
</LI>
</ul>
</ul>
</ul>
</ul>
<LI><strong><A NAME="00263" HREF="msg00263.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Tue 20 Oct 1998, 04:42 GMT
<UL>
<LI><strong><A NAME="00264" HREF="msg00264.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
J C Lawrence <a href="mailto:claw#kanga,nu">claw#kanga,nu</a>, Tue 20 Oct 1998, 04:45 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00265" HREF="msg00265.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Tue 20 Oct 1998, 04:50 GMT
<UL>
<LI><strong><A NAME="00269" HREF="msg00269.html">[MUD-Dev] Re: Bruce Sterling on Virtual Community goals</A></strong>,
Jon Leonard <a href="mailto:jleonard#divcom,slimy.com">jleonard#divcom,slimy.com</a>, Tue 20 Oct 1998, 06:19 GMT
</LI>
</UL>
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