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Groups > comp.lang.forth > #33079

Re: does VFX have the same bug as Gforth?

From Andrew Haley <andrew29@littlepinkcloud.invalid>
Subject Re: does VFX have the same bug as Gforth?
Newsgroups comp.lang.forth
References (7 earlier) <2014Aug25.114440@mips.complang.tuwien.ac.at> <bd-dna_JwbqW92bOnZ2dnUU7-e-dnZ2d@supernews.com> <2014Aug26.083451@mips.complang.tuwien.ac.at> <bYadneETmp8T1mHOnZ2dnUU7-Y-dnZ2d@supernews.com> <2014Aug26.143722@mips.complang.tuwien.ac.at>
Message-ID <UvWdneilU5ccF2HOnZ2dnUU7-RudnZ2d@supernews.com> (permalink)
Date 2014-08-26 08:24 -0500

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Anton Ertl <anton@mips.complang.tuwien.ac.at> wrote:
> Andrew Haley <andrew29@littlepinkcloud.invalid> writes:
>>Anton Ertl <anton@mips.complang.tuwien.ac.at> wrote:
>>> Andrew Haley <andrew29@littlepinkcloud.invalid> writes:
>>>>Anton Ertl <anton@mips.complang.tuwien.ac.at> wrote:
>>>>>>Not really, no.  If you have, say, a word EXIT which is not immediate,
>>>>>>and you want the effect of POSTPONE, then [COMPILE] isn't going to do
>>>>>>it, and will exit from the calling word.  It will have just the same
>>>>>>effect as EXIT on its own.
>>>>> 
>>>>> [COMPILE] EXIT has the same effect as EXIT on its own (not POSTPONE
>>>>> EXIT) in a standard system, no matter how EXIT is implemented.
>>>>
>>>>So what are you arguing about?
>>> 
>>> I am pointing out the factual errors in your postings.  In this case:
>>> It does not matter whether a system implements EXIT as immediate word
>>> or not.
>>
>>Surely it does: if you want the effect of POSTPONE EXIT, but EXIT is
>>not immediate, then [COMPILE] EXIT isn't going to do what you want.
> 
> No, it does not matter.  On a standard system [COMPILE] EXIT is not
> going to produce the same result as POSTPONE EXIT no matter how EXIT
> is implemented.  For example, in Gforth the definition of EXIT is:
> 
> : EXIT ( compilation -- ; run-time nest-sys -- ) \ core
>    exit-like
>    POSTPONE ;s
>    basic-block-end
>    POSTPONE unreachable ; immediate restrict

I don't understand this at all.

> When I do:
> 
> : foo [compile] exit ." bla" ; foo
> 
> it prints nothing

Why does it do that?  Why does FOO not perform the compile time action
of EXIT and then print "bla" ?

>>You need COMPILE EXIT .
> 
> COMPILE is not Forth-94 and is not present in, e.g., Gforth.
> 

>>That's why POSTPONE was invented: so you didn't need to know if a
>>word was immediate or not.
> 
> With Forth-94 [COMPILE] you don't need to know whether a word is
> immediate, either, but you need to know whether it's compilation
> semantics are default or not

Well, yes, which at the time was almost always the same thing.

> (for user-defined words that's the same as knowing whether a word is
> immediate, but for standard-defined words it's not the same).  With
> POSTPONE you don't need to know that.

Andrew.

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Thread

does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-17 21:09 -0700
  Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-17 23:06 -0700
    Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-18 17:03 -0700
      Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-18 22:19 -0400
      Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 09:14 +0000
        Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-19 15:23 +0200
          Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-19 14:54 +0100
            Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-19 16:09 +0200
              Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 15:39 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-19 22:34 +0200
                Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-19 23:29 +0100
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-20 23:06 +0200
                Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-20 22:21 +0100
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-20 07:46 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-21 00:26 +0200
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-20 22:42 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-21 10:23 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-21 23:29 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-22 12:54 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-22 17:54 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-23 10:46 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-23 11:15 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-24 13:32 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-24 10:40 -0700
                Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-24 22:03 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 08:31 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-25 22:55 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-21 12:45 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-22 15:13 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-22 18:47 +0200
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-22 18:28 -0700
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-23 04:44 -0400
                Re: does VFX have the same bug as Gforth? Coos Haak <chforth@hccnet.nl> - 2014-08-23 16:15 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-23 11:50 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-23 07:15 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-23 22:12 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-24 03:51 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-24 13:36 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-25 04:16 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 09:44 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-25 11:53 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 06:34 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 03:55 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:37 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 08:24 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:55 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 10:42 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 16:05 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:20 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-09-23 11:29 -0500
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 23:01 +0200
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-25 15:59 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 06:23 +0000
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:15 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:23 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 01:41 -0700
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:32 +0000
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:43 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 02:48 -0700
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 11:58 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 05:20 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:30 +0000
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-25 14:15 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-25 07:44 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 14:37 +0000
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-25 15:14 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 15:33 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 01:56 -0700
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 04:16 -0500
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 02:24 -0700
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:36 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:40 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 08:57 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:52 +0000
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-26 14:14 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 14:36 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:40 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 10:53 -0500
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:36 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-25 12:02 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 06:42 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 04:08 -0500
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-26 10:37 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 08:30 -0500
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-28 08:47 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-29 13:03 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-29 09:16 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:06 +0000
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-26 07:36 -0400
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:28 +0200
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-24 09:48 +0000
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-24 15:55 -0400
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-24 15:55 -0400
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 08:26 +0000
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-26 07:36 -0400
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:12 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:45 +0200
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-21 03:25 -0700
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-21 23:14 -0700
            Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 14:16 +0000
  Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-17 23:16 -0700
    Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 09:40 +0000
  Re: does VFX have the same bug as Gforth? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2014-08-18 09:16 +0100
  Re: does VFX have the same bug as Gforth? Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2014-08-18 09:32 +0100
    Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-18 13:09 +0100
  Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-18 12:29 +0000
    Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-18 17:10 -0700
      Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-18 17:48 -0700
        Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-18 18:23 -0700
      Re: does VFX have the same bug as Gforth? Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2014-08-19 13:55 +0100

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