March 2022 - Oberon - mailman3.inf.ethz.ch

Compiler Construction on projectoberon.net
by John Stout 10 May '22

10 May '22

Hello everyone I'm working on a compiler and emulation of the RISC processor detailed in the latest (?) edition of Compiler Construction by Professor Wirth from CompilerConstruction1.pdf (projectoberon.net) <http://www.projectoberon.net/wirth/CompilerConstruction/CompilerConstructio…> . I can't follow the Oberon code for the emulator in section 9.5 in the section handling memory instructions, which differs from Peter De Wachter's Oberon RISC emulator at https://github.com/pdewacht/oberon-risc-emu.git In Compiler Construction, once an instruction has been decoded as a memory instruction the address is calculated using adr := (R[b] + IR MOD 100000H) DIV 4; which (apart from the DIV 4) agrees with the code in oberon-risc-emu (which also sign extends the offset before adding it). If adr >= 0 then a load is carried out, and the N and Z flags set depending on the value loaded. However (and this is the bit I don't understand) if adr < 0 then a store is carried out, whereas in oberon-risc-emu u bit of the instruction is checked and if 0 a load is carried out and if 1 a store is carried out. Since I know oberon-risc-emu works, and that agrees with the settings for the u and v bits in Compiler Construction then I assume that must be the correct implementation, but is there an error in Compiler Construction or am I missing something very simple? All the best. John Stout

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Re: [Oberon] Compiler Construction PDF error
by John Stout 28 Mar '22

28 Mar '22

Ah, I didn't think to look at the source code on the site which would have been the last word. Many thanks. All the best. John On Mon, 28 Mar 2022 at 11:00, <oberon-request(a)lists.inf.ethz.ch> wrote: > Send Oberon mailing list submissions to > oberon(a)lists.inf.ethz.ch > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.inf.ethz.ch/mailman/listinfo/oberon > or, via email, send a message with subject or body 'help' to > oberon-request(a)lists.inf.ethz.ch > > You can reach the person managing the list at > oberon-owner(a)lists.inf.ethz.ch > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Oberon digest..." > > > Today's Topics: > > 1. Compiler Construction on projectoberon.net (John Stout) > 2. Re: Compiler Construction on projectoberon.net (Chris Burrows) > 3. Re: Compiler Construction on projectoberon.net (Joerg) > 4. Re: Compiler Construction on projectoberon.net (Chris Burrows) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 27 Mar 2022 11:07:43 +0000 > From: John Stout <cuspcomputers(a)gmail.com> > To: oberon(a)lists.inf.ethz.ch > Subject: [Oberon] Compiler Construction on projectoberon.net > Message-ID: > < > CAE7M_X1Z_QJpjVft+pGexpLpaq7FggUYgJNA4YfWtv4zHwLanA(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hello everyone > > I'm working on a compiler and emulation of the RISC processor detailed in > the latest (?) edition of Compiler Construction by Professor Wirth > from CompilerConstruction1.pdf > (projectoberon.net) > < > http://www.projectoberon.net/wirth/CompilerConstruction/CompilerConstructio… > > > . > > I can't follow the Oberon code for the emulator in section 9.5 in the > section handling memory instructions, which differs from Peter De Wachter's > Oberon RISC emulator at https://github.com/pdewacht/oberon-risc-emu.git > > In Compiler Construction, once an instruction has been decoded as a memory > instruction the address is calculated using > > adr := (R[b] + IR MOD 100000H) DIV 4; > > which (apart from the DIV 4) agrees with the code in oberon-risc-emu (which > also sign extends the offset before adding it). > > If adr >= 0 then a load is carried out, and the N and Z flags set depending > on the value loaded. > However (and this is the bit I don't understand) if adr < 0 then a store is > carried out, whereas in oberon-risc-emu u bit of the instruction is checked > and if 0 a load is carried out and if 1 a store is carried out. > > Since I know oberon-risc-emu works, and that agrees with the settings for > the u and v bits in Compiler Construction then I assume that must be the > correct implementation, but is there an error in Compiler Construction or > am I missing something very simple? > > All the best. > > John Stout >

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Re: [Oberon] Is anyone here a moderator or admin of comp.lang.oberon?
by Treutwein Bernhard 25 Mar '22

25 Mar '22

I tried to file a complaint, but nothing happened ... Sent from Nine<http://www.9folders.com/> ________________________________ Von: Chris Burrows <cfbsoftware(a)gmail.com> Gesendet: Donnerstag, 24. März 2022 19:43 An: ETH Oberon and related systems Betreff: Re: [Oberon] Is anyone here a moderator or admin of comp.lang.oberon? On Fri, Mar 25, 2022 at 12:03 AM Liam Proven <lproven(a)gmail.com<mailto:lproven@gmail.com>> wrote: I just tried to look at a post via Google Groups and got a warning: « Banned content warning Refer to the previous discussion here: [Oberon] Usenet group comp.lang.oberon is no longer accessible https://lists.inf.ethz.ch/pipermail/oberon/2021/015669.html Chris Burrows CFB Software https://www.astrobe.com/RISC5

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Is anyone here a moderator or admin of comp.lang.oberon?
by Liam Proven 24 Mar '22

24 Mar '22

I just tried to look at a post via Google Groups and got a warning: « Banned content warning comp.lang.oberon has been identified as containing spam, malware or other malicious content. For more information about content policies on Google Groups, see our Help Centre article on abuse and our Terms of Service. » -- Liam Proven ~ Profile: https://about.me/liamproven Email: lproven(a)cix.co.uk ~ gMail/gTalk/FB: lproven(a)gmail.com Twitter/LinkedIn: lproven ~ Skype: liamproven UK: (+44) 7939-087884 ~ Czech [+ WhatsApp/Telegram/Signal]: (+420) 702-829-053

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Re: [Oberon] Re (2): Documentation for Gadgets;
by Treutwein Bernhard 24 Mar '22

24 Mar '22

Sent from Nine<http://www.9folders.com/> ________________________________ Von: peter(a)easthope.ca Gesendet: Mittwoch, 23. März 2022 16:25 An: oberon(a)lists.inf.ethz.ch Betreff: [Oberon] Re (2): Documentation for Gadgets; From: Dieter <d.gloetzel(a)web.de> Date: Wed, 23 Mar 2022 09:17:30 +0100 > I also recommend "The Oberon Companion" by Andre Fischer and Hannes Marais > ISBN 3-7281-2493-1 > vdf Hochschulverlag AG ETH Z??rich Thanks Dieter. At the top of each tutorial page is a green box [...] containing the sentence "Content is also available on paper." https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/Tutorial [...] Currently abebooks.com lists 0 copies available. That can change any time. Obtaining the paper form is a matter of patience. just for clarification: André Fischers Tutorial is a precursor of the Oberon Companion by Fischer and Marais. The Companion is available in Oberon *.Text format in most versions of S3/ETH-Oberon and it is allowed to print one copy for personal use. Instructions how this maybe achieved are in the last paragraph of the Getting Started section [...] https://en.wikibooks.org/wiki/Oberon#Getting_Started

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Re (2): Documentation for Gadgets;
by peter＠easthope.ca 23 Mar '22

23 Mar '22

From: Dieter <d.gloetzel(a)web.de> Date: Wed, 23 Mar 2022 09:17:30 +0100 > I also recommend "The Oberon Companion" by Andre Fischer and Hannes Marais > ISBN 3-7281-2493-1 > vdf Hochschulverlag AG ETH Zürich Thanks Dieter. At the top of each tutorial page is a green box containing the sentence "Content is also available on paper." https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/Tutorial "on paper" links to the paper book citation in the Oberon Bibliography. Currently abebooks.com lists 0 copies available. That can change any time. Obtaining the paper form is a matter of patience. From: Treutwein Bernhard <Bernhard.Treutwein(a)Verwaltung.Uni-Muenchen.DE> Date: Wed, 23 Mar 2022 11:50:59 +0000 > afaik the Oberon Companion is out of print, but an online version > should be available on every S3/ETH-Oberon. instructions how to create > a printed personal copy should be/were present in the Oberon wikibook. Bernhard, your section https://en.wikibooks.org/wiki/Oberon#Getting_Started remains in the title page. Your second papragraph refers to the three forms of the tutorial: the paper book, the electronic form in ETH Oberon and the pages in the wikibook. I've taken care to preserve Tutorial content as it was on the ETH Web server. Format or style is altered to the extent that Wikibooks creates the Contents list of a page according to heading markup. That can be suppressed but in my view the automated Contents is a benefit rather than detriment. MediaWiki allows an account to flag any page as watched. A convenient way to monitor changes. Vandalism hasn't been problematic. Criticisms and suggestions always welcome. Thanks, ... P.L. -- mobile: +1 778 951 5147 VoIP: +1 604 670 0140 48.7693 N 123.3053 W

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Re: [Oberon] Documentation for Gadgets; was Re: Software Tracking Project
by Treutwein Bernhard 23 Mar '22

23 Mar '22

afaik the Oberon Companion is out of print, but an online version should be available on every S3/ETH-Oberon. instructions how to create a printed personal copy should be/were present in the Oberon wikibook. Sent from Nine<http://www.9folders.com/> ________________________________ Von: Dieter <d.gloetzel(a)web.de> Gesendet: Mittwoch, 23. März 2022 09:17 An: oberon(a)lists.inf.ethz.ch Betreff: Re: [Oberon] Documentation for Gadgets; was Re: Software Tracking Project I also recommend "The Oberon Companion" by Andre Fischer and Hannes Marais ISBN 3-7281-2493-1 vdf Hochschulverlag AG ETH Zürich Regards, Am 23.03.2022 um 04:50 schrieb peter(a)easthope.ca: > >From skulski at pas.rochester.edu Mon Jan 29 06:27:36 2018 >> My experience with Gadgets was mixed, but I appreciate their >> potential. > I was baffled by Gadgets although didn't make a real study. > > >From joerg.straube at iaeth.ch Tue Mar 6 18:51:28 2018 >> Did you read this intro into the Gadget system: >> http://www.ethoberon.ethz.ch/ethoberon/tutorial/GadgetsIntro.html > André Fischer gave permission to incorporate his tutorials into > the wikibook. The Gadgets pages are there, cited in the Contents page. > https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/Tutorial > > I've read all of the tutorials now. Focussed more on typographical > errors and format than on concepts but well convinced that Gadgets can > be tackled with help of the tutorials. > > Regards, ... P.L. > > -- ____________________________________ Dr. Dieter Glötzel Im Rosengarten 27 64367 Mühltal Tel.: 06151 / 360 82 72

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Documentation for Gadgets; was Re: Software Tracking Project
by peter＠easthope.ca 23 Mar '22

23 Mar '22

>From skulski at pas.rochester.edu Mon Jan 29 06:27:36 2018 > My experience with Gadgets was mixed, but I appreciate their > potential. I was baffled by Gadgets although didn't make a real study. >From joerg.straube at iaeth.ch Tue Mar 6 18:51:28 2018 > Did you read this intro into the Gadget system: > http://www.ethoberon.ethz.ch/ethoberon/tutorial/GadgetsIntro.html André Fischer gave permission to incorporate his tutorials into the wikibook. The Gadgets pages are there, cited in the Contents page. https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/Tutorial I've read all of the tutorials now. Focussed more on typographical errors and format than on concepts but well convinced that Gadgets can be tackled with help of the tutorials. Regards, ... P.L. -- mobile: +1 778 951 5147 VoIP: +1 604 670 0140 48.7693 N 123.3053 W

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Documentation for Gadgets; was Re: Software Tracking Project
by peter＠easthope.ca 23 Mar '22

23 Mar '22

>From skulski at pas.rochester.edu Mon Jan 29 06:27:36 2018 > My experience with Gadgets was mixed, but I appreciate their > potential. I was baffled by Gadgets although didn't make a real study. >From joerg.straube at iaeth.ch Tue Mar 6 18:51:28 2018 > Did you read this intro into the Gadget system: > http://www.ethoberon.ethz.ch/ethoberon/tutorial/GadgetsIntro.html André Fischer gave permission to incorporate his tutorials into the wikibook. The texts are there now, cited in the Contents page. https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/Tutorial I'm still working on the illustations. I've read all of the tutorials now. Focussed more on typographical errors and format than concepts. Well convinced of the value of the tutorials. Regards, ... P.L. -- mobile: +1 778 951 5147 VoIP: +1 604 670 0140 48.7693 N 123.3053 W

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A whiteboard application for explaining ideas
by Srinivas Nayak 22 Mar '22

22 Mar '22

Dear All, Here is a simple application I created. A Simple, Powerful, Free, Brainstorming Whiteboard https://github.com/snayaksnayak/iMage/releases/download/v1.0/iMage_v1.0.zip Kindly have a look at it. I Hope, you can use it while teaching. Sincerely, Srinivas Nayak

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