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Groups > comp.lang.forth > #57971
| From | Ron Aaron <rambamist@gmail.com> |
|---|---|
| Newsgroups | comp.lang.forth |
| Subject | Re: string-stack.4th |
| Date | 2017-04-24 10:11 +0300 |
| Organization | A noiseless patient Spider |
| Message-ID | <odk892$sre$1@dont-email.me> (permalink) |
| References | (14 earlier) <53d8fb40-e625-4c47-b09d-15663771fc9a@googlegroups.com> <xn0kov35o59u81h001@nntp.aioe.org> <b5320064-4394-4baa-b3fb-0a1228d32860@googlegroups.com> <odk2lc$eon$1@dont-email.me> <87lgqqnvry.fsf@nightsong.com> |
On 04/24/17 09:51, Paul Rubin wrote:
> Ron Aaron <rambamist@gmail.com> writes:
>> You can also do something like what OForth does, e.g. play magic with
>> the pointers to the stack items so that the data pointer itself tells
>> you what kind of item is on the stack. That is (in my opinion) a
>> dangerous path, but if used with restraint it works nicely.
>
> If you mean 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.
> The SPARC
> processor even had hardware support for that, which nobody seems to have
> used. If you mean the heap uses different regions for different object
> types and figures out the type of a pointed-to object from its address,
> that's another venerable technique called BIBOP ("big bag of pages")
> though it was used mostly in older, smaller systems.
Yeah, that's not such a bad technique. I could have used it in 8th
when I used discrete preallocated pools (though it would have been more
time-expensive than just looking at the item's "tag").
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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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