<!-- MHonArc v2.4.4 --> <!--X-Subject: [MUD-Dev] Re: I wanna do it OO --> <!--X-From-R13: Quevf Uenl <ptNnzv-pt.UenlEntr.Sqzbagba.OP.QO> --> <!--X-Date: Sat, 24 Oct 1998 20:53:56 -0700 --> <!--X-Message-Id: 199810250347.VAA02432@ami-cg.GraySage.Edmonton.AB.CA --> <!--X-Content-Type: text/plain --> <!--X-Head-End--> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <html> <head> <title>MUD-Dev message, [MUD-Dev] Re: I wanna do it OO</title> <!-- meta name="robots" content="noindex,nofollow" --> <link rev="made" href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA"> </head> <body background="/backgrounds/paperback.gif" bgcolor="#ffffff" text="#000000" link="#0000FF" alink="#FF0000" vlink="#006000"> <font size="+4" color="#804040"> <strong><em>MUD-Dev<br>mailing list archive</em></strong> </font> <br> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] <br clear=all><hr> <!--X-Body-Begin--> <!--X-User-Header--> <!--X-User-Header-End--> <!--X-TopPNI--> Date: [ <a href="msg00474.html">Previous</a> | <a href="msg00476.html">Next</a> ] Thread: [ <a href="msg00483.html">Previous</a> | <a href="msg00472.html">Next</a> ] Index: [ <A HREF="author.html#00475">Author</A> | <A HREF="#00475">Date</A> | <A HREF="thread.html#00475">Thread</A> ] <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> <H1>[MUD-Dev] Re: I wanna do it OO</H1> <HR> <!--X-Subject-Header-End--> <!--X-Head-of-Message--> <UL> <LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI> <LI><em>Subject</em>: [MUD-Dev] Re: I wanna do it OO</LI> <LI><em>From</em>: Chris Gray <<A HREF="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</A>></LI> <LI><em>Date</em>: Sat, 24 Oct 1998 21:47:58 -0600</LI> <LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI> </UL> <!--X-Head-of-Message-End--> <!--X-Head-Body-Sep-Begin--> <HR> <!--X-Head-Body-Sep-End--> <!--X-Body-of-Message--> <PRE> [James Wilson:] >For those who like bytecode as an internal representation, I would like >to note that using 'interpreted objects' rather than bytecode can be quite >speedy. By this I mean that, for instance, a while loop can be represented >as > >struct while_exp : public expression >{ > virtual rep eval (vector<rep> &stack) > { > while (_test->eval (stack)) > _action->eval (stack); > return VOID_REP; > } >.... >private: > expression *_test, *_action; >}; > >this sort of internal representation is also really easy to integrate >hand-written (or automagically-generated) C/C++ code with, as opposed to >bytecode which doesn't have such a straightforward binding. Nod. You can also translate the above representation (which is really just a parse tree for the program) into byte-code readily enough. This is what I was talking about in a previous post, about being able to 'pretty-print' the parse tree into user-selectable MUD languages. Other than having the stack be pointed to by file-static variables instead of being passed around as in your example, this is almost identical to the non-byte-code interpreter in my system. My struct, from the header file: typedef struct { struct Exec *wh_condition; struct Exec *wh_body; } While_t; and the code in the parse-tree interpreter for a 'while': case ex_while: { While_t *wh; wh = ex->ex_v.ex_whilePtr; while (B_TRUE) { runExec(wh->wh_condition, &leftValue, pType); if (leftValue.qv_integer == BOOLEAN_FALSE || Exiting) { break; } runExec(wh->wh_body, pRes, pType); if (Aborting) { Aborting = B_FALSE; runError("execution timeout or abort"); Exiting = B_TRUE; } } *pType = TYPE_VOID; break; } Basically the same, except with a few of the inevitable extra details. (Plus, its not C++ O-O stuff :-)) So, I can attest that what James is suggesting works quite well! I did get additional speedup with bytecodes, however. I think the main reason for this is that the above method uses a lot of function calls, whereas a byte-code interpreter just loops internally. Also, MUD-language function calls are a lot more expensive in my parse-tree interpreter than in my byte-code interpreter, partly because of the need to do general stuff to build the execution environment (like a stack frame) for the called function. -- Chris Gray cg#ami-cg,GraySage.Edmonton.AB.CA </PRE> <!--X-Body-of-Message-End--> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <HR> <!--X-Follow-Ups-End--> <!--X-References--> <!--X-References-End--> <!--X-BotPNI--> <UL> <LI>Prev by Date: <STRONG><A HREF="msg00474.html">[MUD-Dev] I wanna do it OO</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg00476.html">[MUD-Dev] Re: PDMud, Gamora and Casbah</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg00483.html">[MUD-Dev] Re: DevMUD - thoughts.1</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg00472.html">[MUD-Dev] Re: DevMUD Event Language</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="index.html#00475"><STRONG>Date</STRONG></A></LI> <LI><A HREF="thread.html#00475"><STRONG>Thread</STRONG></A></LI> </UL> </LI> </UL> <!--X-BotPNI-End--> <!--X-User-Footer--> <!--X-User-Footer-End--> <ul><li>Thread context: <BLOCKQUOTE><UL> <LI><STRONG>[MUD-Dev] Re: MUD verb handling (Was: DevMUD - thoughts.1)</STRONG>, <EM>(continued)</EM> <ul compact> <ul compact> <LI><strong><A NAME="00487" HREF="msg00487.html">[MUD-Dev] Re: MUD verb handling (Was: DevMUD - thoughts.1)</A></strong>, Adam J. Thornton <a href="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</a>, Sun 25 Oct 1998, 15:11 GMT </LI> <LI><strong><A NAME="00543" HREF="msg00543.html">[MUD-Dev] Re: MUD verb handling (Was: DevMUD - thoughts.1)</A></strong>, Jon Leonard <a href="mailto:jleonard#divcom,slimy.com">jleonard#divcom,slimy.com</a>, Tue 27 Oct 1998, 06:57 GMT <UL> <LI><strong><A NAME="00549" HREF="msg00549.html">[MUD-Dev] Re: MUD verb handling (Was: DevMUD - thoughts.1)</A></strong>, Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Tue 27 Oct 1998, 16:32 GMT </LI> </UL> </LI> </ul> <LI><strong><A NAME="00483" HREF="msg00483.html">[MUD-Dev] Re: DevMUD - thoughts.1</A></strong>, James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Sun 25 Oct 1998, 13:47 GMT </LI> </ul> </LI> <LI><strong><A NAME="00475" HREF="msg00475.html">[MUD-Dev] Re: I wanna do it OO</A></strong>, Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 25 Oct 1998, 03:53 GMT <LI><strong><A NAME="00472" HREF="msg00472.html">[MUD-Dev] Re: DevMUD Event Language</A></strong>, Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 25 Oct 1998, 02:37 GMT <LI><strong><A NAME="00465" HREF="msg00465.html">[MUD-Dev] Re: PDMud, Gamora and Casbah</A></strong>, ApplePiMan <a href="mailto:ApplePiMan#aol,com">ApplePiMan#aol,com</a>, Sat 24 Oct 1998, 23:35 GMT <UL> <li><Possible follow-up(s)><br> <LI><strong><A NAME="00471" HREF="msg00471.html">[MUD-Dev] Re: PDMud, Gamora and Casbah</A></strong>, Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 25 Oct 1998, 02:33 GMT <UL> <LI><strong><A NAME="00474" HREF="msg00474.html">[MUD-Dev] I wanna do it OO</A></strong>, James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Sun 25 Oct 1998, 03:14 GMT </LI> </UL> </LI> </UL> </LI> </UL></BLOCKQUOTE> </ul> <hr> <center> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] </center> <hr> </body> </html>