Re: Error in CREATE DOES>

----- Original Message -----
From: "Elizabeth D Rather" <erather_at_forth.com>
To: <swiftx_at_forth.com>
Sent: Monday, August 23, 2004 3:57 PM
Subject: [swiftx] Re: Error in CREATE DOES>

> > -----Original Message-----
> > From: swiftx-bounce_at_forth.com [mailto:swiftx-bounce_at_forth.com]On Behalf
> > Of Nestor D. Closa
> > Sent: Monday, August 23, 2004 11:30 AM
> > To: swiftx_at_forth.com
> > Subject: [swiftx] Re: Error in CREATE DOES>
> >
> >
> > Sorry Elizabeth, I committed a mistake.
> > This is the complete code taken from
> > http://forth.sourceforge.net/word/structure/index.html
> >
> >
> > : STRUCTURE ( "name" -- xx offset )
> > CREATE
> > HERE ( leave the address of the following sizeof-comma )
> > 0 DUP , ( initial size is zero and left on the stack )
> > DOES> ( has the address of the sizeof-comma )
> > CREATE ( make a variable )
> > @ ALLOT ( and make the variable that long )
> > ;
>
> Yes, your version had the DUP in the wrong place.
>
> > : ENDSTRUCTURE ( xx offset -- )
> > SWAP ! ( store the last endoffset into the sizeof-comma )
> > ;
> >
> > : SIZEOF ( "name" -- size )
> > ' >BODY @ ( get the sizeof ... some implementations need also
>DOES )
> > STATE @ IF [COMPILE] LITERAL THEN
> > ; IMMEDIATE
> >
> > : NEWFIELD ( offset field_size "name" -- offset' )
> > CREATE
> > OVER , ( store the current end_offset )
> > + ( increase the end_offset by the field_size )
> > DOES>
> > @ + ( add the memorized offset of the field)
> > ;
>
> It's unclear how this is to be used, though. It seeme unnecessarily
complex
> to me. I like the Open Firmware version better.
>
> Also, I can't help much with your original complaint of an error message,
> since I don't know what it was. I suspect that it was a consequence of
> having an extra address on the stack rather than a zero, though, and hence
> making a humungous size at some point.

The error is:

INTERPRETER ok
  ok
: STRUCT ( "name" -- xx offset )
   CREATE
      HERE ( leave the address of the following
sizeof-comma )
      0 DUP , ( initial size is zero and left on the stack )
   DOES> ( has the address of the sizeof-comma )
      CREATE ( make a variable ) CREATE ?

Nevertheless with swiftForth it compiles ok
(SwiftX MSP430 3.1.2)

Regards,
Nestor

>
> Cheers,
> Elizabeth
>
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Received on Mon Aug 23 2004 - 12:38:07 PDT