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Re: quick review of <BUILDS and CREATE history

From "Rod Pemberton" <dont_use_email@xnohavenotit.cnm>
Newsgroups comp.lang.forth
Subject Re: quick review of <BUILDS and CREATE history
Date 2014-01-20 16:14 -0500
Organization Aioe.org NNTP Server
Message-ID <op.w9z7x2uk5zc71u@localhost> (permalink)
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On Mon, 20 Jan 2014 01:54:25 -0500, Elizabeth D Rather <erather@forth.com>  
wrote:

> On 1/19/2014 7:27 PM, Rod Pemberton wrote:

> I'm baffled. CREATE makes a header; :NONAME doesn't. CREATE
> doesn't turn on the compiler. :NONAME does. These differences
> are critical, not trivial.
>

Based on your post and Mark's, I think my :NONAME is functioning
like :NONAME combined with HEADER.

>>> It sounds as though you have a very
>>> mistaken notion of what :NONAME does.
>>
>> AIUI, :NONAME is the same as : except it doesn't install
>> a name into the dictionary header of the word being defined
>> and it returns an xt.  It's definition is terminated by
>> a ; just like a : definition.  It compiles a definition
>> just like a : definition.
>>
>> In most Forths, : calls CREATE to build the header
>> and insert the name the word being defined.  After
>> CREATE is finished, the colon definition continues
>> compiling until ; .
>
> In most Forths that I'm familiar with, : calls a lower-level word to
> build the header and insert the name. CREATE also calls that. However,
> CREATE does *not* "continue compiling", instead it sets the default
> action of the word just created to DODOES or equivalent with an
> associated data location. : has no associated data location. In other
> words, the only thing both : and CREATE share is a call to the
> lower-level word to make the header.
>

Let me break down what I'm doing currently.
It's been a while since I've read/coded the code,
so hopefully, no misunderstandings/mistakes posted...
This is what :NONAME CREATE : and ; are doing:

:NONAME
-the next few steps creates a dictionary header
--blanks name field area (NFA)
--updates link field address (LFA) with LAST
--updates dictionary bits (part of NFA)
--updates LAST
--updates dictionary pointer (DP) to code field address (CFA)
-puts HERE (at current CFA) on the stack for use as an XT
-compiles ENTER into the definition (at current CFA)
-turns on compiling ]
-SMUDGEs the definition being compiled (turns on)

:
-executes :NONAME
-executes BL WORD to get name of definition
-executes COUNT
-sets up values for CMOVE which consumes :NONAMEs XT
-finds the name field (NFA)
-executes CMOVE to move the definition's name into the name field

;
-compiles EXIT into a definition
-SMUDGEs the definition being compiled (turns off)
-turns off compiling [

CREATE
-executes :
-places HERE on the stack
-executes ;
-sets the dictionary pointer (DP) to code field address (CFA)
-stores DOVAR into the code field address (CFA)
-resets dictionary pointer (DP) to saved HERE on stack


> Consider the definition:
>
> : CONSTANT ( n -- )   CREATE ,
>     DOES> ( -- n ) @ ;
>
> Here CREATE builds the header and , compiles the value in data space.
> The fact that compiling continues is not due to CREATE, which has
> finished executing, but to : which invoked CREATE and , and continued
> compiling.
>

All the common definitions which use CREATE work correctly.

>> AIUI, all I've done is switch things around to build
>> : up from :NONAME instead of using CREATE.  If it's
>> correct, which I believe it is, <BUILDS can be built
>> from :NONAME also.
>
> <BUILDS and CREATE need to do two things that :NONAME
> does not: build a header, and associate a data space
> address. :NONAME turns on the compiler and records the
> *code space* location of the associated xt,
> neither of which <BUILDS or CREATE do.
>
> They have *nothing* in common.
>
> The distinction between code space and data space is critical
> when you're dealing with RAM/FLASH architectures.
>

Okay, I suspect you're going to tell me to remove the header
creation in :NONAME and place it into a word named HEADER
or (CREATE).  Then, have : call HEADER or (CREATE).

So, then, the rough definition for : would become:
: HEADER :NONAME BL WORD COUNT ... "get NFA" CMOVE ;

I'm assuming the rest is acceptable ... ?

IIRC, :NONAME on my system needed a header for the dictionary
to be linked together correctly.  If so, I'll have to check
into why that is...  It's probably wise to fix the issue.


Rod Pemberton

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Thread

quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-19 13:15 -0500
  Re: quick review of <BUILDS and CREATE history albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-01-19 20:07 +0000
    Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-19 21:45 +0000
  Re: quick review of <BUILDS and CREATE history Coos Haak <chforth@hccnet.nl> - 2014-01-19 22:02 +0100
  Re: quick review of <BUILDS and CREATE history Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-01-19 17:24 -0600
    Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-19 14:54 -1000
      Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-19 22:37 -0500
        Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-19 18:01 -1000
          Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-20 00:27 -0500
            Re: quick review of <BUILDS and CREATE history Elizabeth D Rather <erather@forth.com> - 2014-01-19 20:54 -1000
              Re: quick review of <BUILDS and CREATE history Elizabeth D Rather <erather@forth.com> - 2014-01-19 21:19 -1000
              Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-20 16:14 -0500
                Re: quick review of <BUILDS and CREATE history Elizabeth D Rather <erather@forth.com> - 2014-01-20 12:07 -1000
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-21 11:37 -0500
                Re: quick review of <BUILDS and CREATE history albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-01-21 17:41 +0000
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-21 08:30 -1000
                Re: quick review of <BUILDS and CREATE history oh2aun@gmail.com - 2014-01-21 11:17 -0800
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-21 09:44 -1000
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-21 15:18 -0500
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-21 12:07 -1000
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-21 22:04 -0500
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-21 19:21 -1000
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-22 13:38 +0000
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-22 08:50 -1000
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-23 17:17 -0500
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-23 13:46 -1000
                Re: quick review of <BUILDS and CREATE history Bernd Paysan <bernd.paysan@gmx.de> - 2014-01-24 15:07 +0100
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-25 15:18 +0000
                Re: quick review of <BUILDS and CREATE history Bernd Paysan <bernd.paysan@gmx.de> - 2014-01-25 20:18 +0100
                Re: quick review of <BUILDS and CREATE history Coos Haak <chforth@hccnet.nl> - 2014-01-25 20:44 +0100
                Re: quick review of <BUILDS and CREATE history Bernd Paysan <bernd.paysan@gmx.de> - 2014-01-25 21:41 +0100
                Re: quick review of <BUILDS and CREATE history "Alex McDonald" <blog@rivadpm.com> - 2014-01-25 22:47 +0000
                Re: quick review of <BUILDS and CREATE history Bernd Paysan <bernd.paysan@gmx.de> - 2014-01-26 01:54 +0100
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-27 16:49 +0000
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-27 15:40 +0000
                Re: quick review of <BUILDS and CREATE history Bernd Paysan <bernd.paysan@gmx.de> - 2014-01-27 23:00 +0100
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-27 19:43 -0500
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-28 09:25 +0000
                Re: quick review of <BUILDS and CREATE history Bernd Paysan <bernd.paysan@gmx.de> - 2014-01-28 19:45 +0100
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-30 15:32 +0000
                Re: quick review of <BUILDS and CREATE history albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-01-28 14:20 +0000
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-25 15:28 +0000
                Re: quick review of <BUILDS and CREATE history Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-01-25 13:51 -0600
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-27 15:34 +0000
                Re: quick review of <BUILDS and CREATE history Lars Brinkhoff <lars.spam@nocrew.org> - 2014-01-24 08:11 +0100
                Re: quick review of <BUILDS and CREATE history Mark Wills <markrobertwills@yahoo.co.uk> - 2014-01-24 01:28 -0800
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-24 05:00 -0500
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-24 09:32 -1000
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-24 17:48 -0500
                Re: quick review of <BUILDS and CREATE history "Elizabeth D. Rather" <erather@forth.com> - 2014-01-24 13:14 -1000
                Re: quick review of <BUILDS and CREATE history Mark Wills <markrobertwills@yahoo.co.uk> - 2014-01-24 16:16 -0800
                Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-02-23 12:13 -0500
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-22 13:32 +0000
            Re: quick review of <BUILDS and CREATE history Mark Wills <markrobertwills@yahoo.co.uk> - 2014-01-20 04:14 -0800
              Re: quick review of <BUILDS and CREATE history Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-01-20 06:31 -0600
                Re: quick review of <BUILDS and CREATE history Elizabeth D Rather <erather@forth.com> - 2014-01-20 08:04 -1000
                Re: quick review of <BUILDS and CREATE history anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-01-21 14:09 +0000
              Re: quick review of <BUILDS and CREATE history "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-01-20 16:14 -0500
  Re: quick review of <BUILDS and CREATE history trebor.english@gmail.com - 2014-01-22 17:44 -0800
  Re: quick review of <BUILDS and CREATE history trebor.english@gmail.com - 2014-01-22 18:24 -0800
    Re: quick review of <BUILDS and CREATE history albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-01-23 14:00 +0000
      Re: quick review of <BUILDS and CREATE history trebor.english@gmail.com - 2014-01-23 11:06 -0800
        Re: quick review of <BUILDS and CREATE history Paul Rubin <no.email@nospam.invalid> - 2014-01-23 11:33 -0800
          Re: quick review of <BUILDS and CREATE history trebor.english@gmail.com - 2014-01-23 11:42 -0800
        Re: quick review of <BUILDS and CREATE history Mikael Nordman <oh2aun@gmail.com> - 2014-01-23 11:51 -0800

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