Groups > comp.lang.forth > #19473

Re: Offline compilation of Forth

From	Bernd Paysan <bernd.paysan@gmx.de>
Newsgroups	comp.lang.forth
Subject	Re: Offline compilation of Forth
Date	2013-02-05 18:47 +0100
Organization	1&1 Internet AG
Message-ID	<2578331.ORClnDGC8S@sunwukong.fritz.box> (permalink)
References	(1 earlier) <M8udnV_U7KPNppfMnZ2dnUVZ_rudnZ2d@supernews.com> <kef0kt$d4q$1@oravannahka.helsinki.fi> <_NCdnTkA4ucQjpbMnZ2dnUVZ_sadnZ2d@supernews.com> <ker7qf$5ov$1@oravannahka.helsinki.fi> <yPednT-lKNDuqozMnZ2dnUVZ_sidnZ2d@supernews.com>

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Andrew Haley wrote:
>> - If cells on host are untagged, converting them correctly to the
>> target
>>  architecture seems impossible. Suppose the host is 32-bit and the
>>  target is 64-bit.
> 
> That's impossible because the host wouldn't be able to form an address
> for the target.  The only time I ever saw a real 16 -> 32 bit cross
> compiler, it used a 32-bit Forth running on a 16-bit x86 to target the
> 68000.  It's a very rare need, to say the least, because you're
> generally compiling from a desktop computer (big) to an embedded
> widget (small).

Nowadays, the Gforth cross compiler usually runs on a 64 bit machine, 
cross compiling 32 bits there.  But when we started, it was the other 
way round: 32 bit machine, 64 bit target.

The situation is much better than it looks, because addresses are 
offsets from the image start, and therefore, you don't need 64 bits for 
them.

Some parts are a bit tricky, like the name headers (cell sized length, 
flags in the top bits), but most literals are 32 bits.  The tricky ones 
get special treatment.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://bernd-paysan.de/

Thread

Offline compilation of Forth Lauri Alanko <la@iki.fi> - 2013-01-28 11:54 +0000
  Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-01-28 17:19 +0000
    Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-01-28 22:08 +0100
    Re: Offline compilation of Forth "Peter Knaggs" <pjk@bcs.org.uk> - 2013-02-03 10:50 +0000
      Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-03 12:11 +0000
        Re: Offline compilation of Forth "A. K." <akk@nospam.org> - 2013-02-03 14:59 +0100
          Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-03 15:14 +0100
            Re: Offline compilation of Forth Hannu Vuolasaho <hannu.vuolasaho@nospam.tut.fi.invalid> - 2013-02-03 15:25 +0000
          Re: Offline compilation of Forth Gary Bergstrom <g.bergstrom@ieee.org> - 2013-02-05 08:13 -0800
      Re: Offline compilation of Forth anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-04 16:23 +0000
  Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-28 12:26 -1000
  Re: Offline compilation of Forth anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-01-29 08:55 +0000
    Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-01-29 17:49 +0100
      Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-01-30 00:42 -0800
        Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-01-30 11:58 +0000
        Re: Offline compilation of Forth Mark Wills <forthfreak@gmail.com> - 2013-01-30 23:16 -0800
          Re: Offline compilation of Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-01-31 13:29 +0000
            Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-03 12:49 +1100
              Re: Offline compilation of Forth "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2013-02-14 20:37 -0800
      Re: Offline compilation of Forth mhx@iae.nl (Marcel Hendrix) - 2013-02-03 21:15 +0200
        Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-04 02:04 +0100
      Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-04 13:22 +0000
        Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-04 20:07 +0100
          Re: Offline compilation of Forth mhx@iae.nl (Marcel Hendrix) - 2013-02-04 23:07 +0200
            Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-05 18:33 +0100
              Re: Offline compilation of Forth mhx@iae.nl (Marcel Hendrix) - 2013-02-06 22:53 +0200
                Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-07 00:30 +0100
    Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-01-30 00:36 -0800
  Re: Offline compilation of Forth Lauri Alanko <la@iki.fi> - 2013-01-30 18:12 +0000
    Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-30 09:36 -1000
    Re: Offline compilation of Forth "A. K." <akk@nospam.org> - 2013-01-31 07:45 +0100
    Re: Offline compilation of Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-01-31 03:37 -0600
      Re: Offline compilation of Forth Lauri Alanko <la@iki.fi> - 2013-02-01 00:01 +0000
        Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-31 14:59 -1000
          Re: Offline compilation of Forth Lauri Alanko <la@iki.fi> - 2013-02-05 15:17 +0000
            Re: Offline compilation of Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-02-05 10:46 -0600
              Re: Offline compilation of Forth Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-05 18:47 +0100
    Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-01-31 21:47 +1100
      Re: Offline compilation of Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-01-31 06:12 -0600
        Re: Offline compilation of Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-01-31 13:32 +0000
        Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-31 08:27 -1000
          Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-01 10:23 +1100
            Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-31 13:53 -1000
              Re: Offline compilation of Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-02-01 03:17 +0000
                Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-31 18:43 -1000
                Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-02-01 08:45 -0800
              Re: Offline compilation of Forth Mark Wills <forthfreak@gmail.com> - 2013-01-31 23:05 -0800
                Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-01-31 21:25 -1000
                Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-02-01 08:55 -0800
                Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-02-01 09:18 -1000
                Re: Offline compilation of Forth Mark Wills <forthfreak@gmail.com> - 2013-02-01 13:04 -0800
              Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-03 11:20 +1100
                Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-03 12:20 +0000
                Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-02-03 07:22 -0800
                Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-03 17:54 +0000
                Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-02-03 10:17 -0800
                Re: Offline compilation of Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-02-03 19:33 +0000
                Re: Offline compilation of Forth Paul Rubin <no.email@nospam.invalid> - 2013-02-03 11:53 -0800
                Re: Offline compilation of Forth Coos Haak <chforth@hccnet.nl> - 2013-02-04 00:59 +0100
                Re: Offline compilation of Forth Matthias Koch <matthias.koch@hot.uni-hannover.de> - 2013-02-04 11:38 +0100
                Re: Offline compilation of Forth Brad Eckert <hwfwguy@gmail.com> - 2013-02-06 09:13 -0800
                Re: Offline compilation of Forth "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2013-02-14 21:02 -0800
                Re: Offline compilation of Forth "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2013-02-14 20:55 -0800
                Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-02-03 08:26 -1000
                Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-05 13:04 +1100
                Re: Offline compilation of Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-05 10:33 +0000
                Re: Offline compilation of Forth "Elizabeth D. Rather" <erather@forth.com> - 2013-02-05 08:56 -1000
                Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-08 02:07 +1100
                Re: Offline compilation of Forth Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2013-02-07 19:03 +0100
                Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-09 22:45 +1100
                Re: Offline compilation of Forth Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2013-02-09 18:56 +0100
                Re: Offline compilation of Forth Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2013-02-11 00:19 +0100
                Re: Offline compilation of Forth Alex McDonald <blog@rivadpm.com> - 2013-02-09 11:59 -0800
                Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-13 13:13 +1100
                Re: Offline compilation of Forth Alex McDonald <blog@rivadpm.com> - 2013-02-12 19:19 -0800
                Re: Offline compilation of Forth "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2013-02-14 21:01 -0800
      Re: Offline compilation of Forth Roberto Waltman <usenet@rwaltman.com> - 2013-02-03 16:26 -0500
        Re: Offline compilation of Forth "Ed" <invalid@nospam.com> - 2013-02-05 15:32 +1100
          Re: Offline compilation of Forth Mark Wills <forthfreak@gmail.com> - 2013-02-04 23:18 -0800

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