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Groups > comp.lang.forth > #57972

Re: string-stack.4th

From Lars Brinkhoff <lars.spam@nocrew.org>
Newsgroups comp.lang.forth
Subject Re: string-stack.4th
Organization nocrew
References (15 earlier) <xn0kov35o59u81h001@nntp.aioe.org> <b5320064-4394-4baa-b3fb-0a1228d32860@googlegroups.com> <odk2lc$eon$1@dont-email.me> <87lgqqnvry.fsf@nightsong.com> <odk892$sre$1@dont-email.me>
Date 2017-04-24 09:27 +0200
Message-ID <86vapumfj1.fsf@molnjunk.nocrew.org> (permalink)

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Ron Aaron wrote:
> Paul Rubin wrote:
>> Oforth uses aligned pointers and steal one or two bits for tags,
>> that's a very common technique and works well.
>
> Yes, that's what I mean.  The danger is that you can't (reliably) rely
> on pointer layout in a cross-platform manner.  So it's a dangerous
> technique, IMO.

If you write your implementation in a high-level language such as C, you
can't rely on the internal pointer representation if you want to be
portable to all present, past, and future targets.  However, if you only
take into account those that are in use now and the forseeable future,
you should be quite safe assuming pointers are linear byte indexes into
memory.

From a practical standpoint, it doesn't seem that dangerous.  But sure,
if you want 100% portability, stay away from pointer tricks.

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Thread

Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-15 16:54 -0700
  Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-15 19:55 -0700
    Re: string-stack.4th Julian Fondren <julian.fondren@gmail.com> - 2017-04-15 20:08 -0700
    Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-16 13:50 +0000
      Re: string-stack.4th anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-16 15:51 +0000
        Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-16 22:16 +0000
          Re: string-stack.4th anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-17 12:04 +0000
            Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-17 13:11 -0700
              Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-17 23:18 +0000
                Re: string-stack.4th albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-18 01:49 +0200
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-19 23:03 +0000
                Re: string-stack.4th "Elizabeth D. Rather" <erather@forth.com> - 2017-04-19 13:19 -1000
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-20 00:15 +0000
                Re: string-stack.4th "Elizabeth D. Rather" <erather@forth.com> - 2017-04-19 14:34 -1000
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-20 17:16 +0000
                Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-20 15:08 -0700
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-20 00:16 +0000
                Re: string-stack.4th albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-20 21:10 +0200
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-21 09:59 +0000
                Re: string-stack.4th albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-20 20:50 +0200
                Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-17 19:47 -0700
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-19 23:08 +0000
              Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-18 00:10 -0700
                Re: string-stack.4th Alex <alex@rivadpm.com> - 2017-04-18 13:48 +0100
                Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-18 09:15 -0700
                Re: string-stack.4th Alex <alex@rivadpm.com> - 2017-04-18 18:23 +0100
            Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-17 23:07 +0000
            Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-18 09:09 -0700
              Re: string-stack.4th lehs <skydda.barnen@gmail.com> - 2017-04-18 10:27 -0700
      Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-16 19:26 -0700
        Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-17 23:13 +0000
          Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-23 12:39 -0700
            Re: string-stack.4th Michael Barry <barrym95838@yahoo.com> - 2017-04-23 22:25 -0700
              Re: string-stack.4th foxaudioresearch@gmail.com - 2017-04-24 14:06 -0700
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-29 03:19 +0000
            Re: string-stack.4th Ron Aaron <rambamist@gmail.com> - 2017-04-24 08:35 +0300
              Re: string-stack.4th Paul Rubin <no.email@nospam.invalid> - 2017-04-23 23:51 -0700
                Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-24 00:10 -0700
                Re: string-stack.4th Ron Aaron <rambamist@gmail.com> - 2017-04-24 10:11 +0300
                Re: string-stack.4th Lars Brinkhoff <lars.spam@nocrew.org> - 2017-04-24 09:27 +0200
                Re: string-stack.4th Paul Rubin <no.email@nospam.invalid> - 2017-04-24 01:14 -0700
            Re: string-stack.4th Alex <alex@rivadpm.com> - 2017-04-24 14:38 +0100
            Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-29 03:18 +0000
            Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-29 03:27 +0000
              Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-28 22:13 -0700
                Re: string-stack.4th Alex <alex@rivadpm.com> - 2017-04-29 09:41 +0100
                Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-29 07:05 -0700
                Re: string-stack.4th "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-29 11:43 +0000
  Re: string-stack.4th hughaguilar96@gmail.com - 2017-04-15 21:15 -0700

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