Squeak-dev June 1998

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83 participants
130 discussions

Application Question
by Brian Klump 08 Jun '98

08 Jun '98

Is there a port of the Refractoring Browser for VisualWorks (http://st-www.cs.uiuc.edu/users/brant/Refactory/RefactoringBrowser.html) to Squeak? Also, is there anything similar to the EnvironmentEditor (it's a workspace that holds onto local variable...super handy, I use it at work under VW)? I've been looking around at Squeak, and it's really neat! Oh yeah, one other quick one, is there a de-facto site just for Squeak goodies/applications? I've found FTP sites with some stuff on them, but sometimes they don't have descriptions or anything. If there isn't one, I would be interested in helping to start it (or helping out in any way I can on a current one). Thanks, and keep up the great work! -Brian Klump _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com

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Squeak Documentation
by Martin Pammer 07 Jun '98

07 Jun '98

Hello Squeakers Is there a way to extract the following information for a class categorie ? for all classes in categorie class definition class comment class protocol Morphic-Kernel ----------------------- Morph ---------- instanceVariableNames: bounds owner submorphs fullBounds color eventHandler properties costumee classVariableNames: EmptyArray poolDictionaries: <none> comment: ----------------- A morph (from the Greek "shape" or "form") is an interactive graphical object. initialization ------------------ initialExtent initialize openInMVC openInWorld "Add this morph to the world. If in MVC, then provide a Morphic window for it." standardPalette "Answer a standard palette forced by some level of enclosing presenter, or nil if none" .... accessing ---------------- eventHandler eventHandler: anEventHandler "Note that morphs can share eventHandlers and all is OK. " rotationDegrees .... and so on. Has anyone done this already ? If not, I will try to make it ba myself. Any suggestions ? With best regards Martin Pammer VRZ Informatik mpammer(a)vrz.net

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Windows primitive memory leak
by William O. Dargel 07 Jun '98

07 Jun '98

I've found a memory leak in the FileDirectory primitive for Windows. You can actually run into it just by moving around the directory hierarchy in a FileList browser. Every time FileDirectory>>primLookupEntryIn:index: is called it loses memory. By looking at "Committed Bytes" in the Windows NT Performance Monitor, I found that it loses about 4KB each time when looking up a directory entry on a local hard disk, and 20KB for a network drive. By doing something like: 1 to: 5000 do: [:i | FileDirectory default primLookupEntryIn: 'w:\smalltalk' index: 1] you can just watch the memory usage ramp up, and might also reach a point where it gets a "system primitive failed". I'm not currently in a position to recompile the VM. But in looking at dir_Lookup() in sqWin32Directory.c, I think that the problem might be that there is no call to FindClose() on the normal return when an entry is found. Perhaps someone (Andreas?) could confirm this bug and then check out the proposed solution. Thanks, ------------------------------------------- Bill Dargel wdargel(a)shoshana.com Shoshana Technologies 100 West Joy Road, Ann Arbor, MI 48105 USA

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Re: Morphic question
by scottw＠wdi.disney.com 06 Jun '98

06 Jun '98

At 3:37 AM -0700 6/3/98, Juan Cires Martinez wrote: >Morphic question: Morph>>replaceSubmorph:by: calls "self autoLineLayout", >but autoLineLayout is only implemented by PasteUpMorph. Shouldn't there >be a default Morph>>autoLineLayout? Thanks, Juan, keen spotting! This glitch went unnoticed because replaceSubmorph:by: happens only to be sent to PasteUpMorphs at the moment -- but obviously it needs to work for any Morph. In the fix for this (which will go out with the next batch), the part of replaceSubmorph:by: that is specific to PasteUpMorph is factored out to an override in PasteUpMorph. -- Scott

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compressed mac version
by Jason Karney 06 Jun '98

06 Jun '98

Hi all, Is there a version of Squeak 2.0 with files compressed so that the whole thing fits on one or more floppies? I've seen a compressed version, but it's 1.8 Meg, and I have to transport from NT at work to a Mac at home. Thanks. -- Jason Karney -- NetGenics Research Team jason(a)netgenics.com [STOP] Okay, you were there yesterday, but Where do you want to go tomorrow?

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Re: Re: Transcript hangover
by sqrmax＠cvtci.com.ar 06 Jun '98

06 Jun '98

Hi. >>I've just downloaded the latest updates (boy, I LOVE SQUEAK!), and now my >>poor Transcript shows some text but hangs on its way. The fix is getting close. >Are you saying that you are still having trouble with the same transcript as before, or that if you create a new transcript, you can still get into trouble by some sequence of actions? I was having trouble with the same Transcript as before... I also tried filling a new Transcript with text, but nothing bad happened. I'll try with the next internet update session (the output on the Transcript was the text inside the hangovered Transcript). >I did not intend to fix the first - use emergency collapse and get rid of it. Yeah... it's gone. I also sent you a fix for the MVC inspectors, have you seen it? Andres.

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Re: DEC itsy
by Randy Siler 06 Jun '98

06 Jun '98

I'm passing along this little fragment because there was some talk about the DEC itsy computer and a possible squeak port. > > I guess last Friday (May 29th) there was a talk on this new portable > computing device. If anyone has any comments on it, please fire them my > way. I'll summarize if anyone is interested. > I went. Some notes and cool stuff I saw - Based on 200Mhz StrongARM - running linux ARM port - display is 320x200. Saw 320x200 MPEG video of Terminator 2 scene - played with it running the linux 'copilot' PalmPilot Emulator :) Other things it can do (but didn't see demo): - Runs Apache! With ricoched wireless modem daughter card, can serve up pages, as well as some remote-admin stuff via the web. Itsy Web site at DEC: http://www.research.digital.com/wrl/itsy/

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Re: headless images
by Andreas Raab 06 Jun '98

06 Jun '98

> Does Squeak have any support for headless images? On Win95/NT, just start the VM with '-headless' or use the '-service:' switch for installing as an automatically started system service. On Unix, #define HEADLESS and recompile the VM if nobody has already done this. On Acorn ... uh hell, Tim can you help me out?! It was simple, but can't remember. Bye, Andreas -- Linear algebra is your friend - Trigonometry is your enemy. +===== Andreas Raab ============= (raab(a)isg.cs.uni-magdeburg.de) =====+ I Department of Simulation and Graphics Phone: +49 391 671 8065 I I University of Magdeburg, Germany Fax: +49 391 671 1164 I +=============< http://isgwww.cs.uni-magdeburg.de/~raab >=============+

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Debugging C translation causes crash
by Aik-Siong Koh 05 Jun '98

05 Jun '98

<x-rich>I am trying to learn how C code is generated so I tried to step through the following code: "self halt. AbstractSound cCodeForSoundPrimitives" with the debugger, but the VM crashed with the following dump: <bigger> Current byte code: 0 Primitive index: 88 Stack dump follows: 19678900 [] in BlockContext>newProcess I am using squeak 2.0 on NT 4.0. </bigger> All the best Aik-Siong Koh </x-rich>

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Re: Debugging C translation causes crash
by Andreas Raab 05 Jun '98

05 Jun '98

> I can go quite deep. The crash occurs inside Parser>>method:context: . > > I get the same crash with > "self halt. Interpreter translate: 'InterpTest.c' doInlining: true." Jupp. I found it. It's actually quite interesting what's going on here: Your'e basically simulating the Parser in both expressions. Now, the parser obviously needs to look up the literals from a method to translate and it therefore calles Symbol>>hasInterned:ifTrue: quite some times (to be exact, #hasInterned:ifTrue: is actually called by the Encoder but this doesn't matter for the purpose of this explanation). Ok, so #hasInterned:ifTrue: checks if a given string is already defined as a symbol. It does so by looking up the symbol tables and doing a little search in it. Now to the simulation in the debugger: This stuff is run by ContextPart (see category instruction decoding and system simulation) but for now we're only interested in message sends. Whenever a message send is simulated the compiled method is checked for containing a primitive. Getting deeper into the simulation ContextPart needs to determine if this primitive could be successfully executed or not so it can activate the associated Smalltalk code in the case of primitive failure. Getting even more deeper into this, ContextPart checks success or failure of a method by returning #simulatorFail in the case of a problem. Aha! And that's the point. The assumption is that NO PRIMITIVE CAN EVER RETURN #simulatorFail IN THE CASE OF SUCCESS!!!! However, due to #simulatorFail being a Symbol, a lookup in the symbol table by the parser ACTUALLY CAN RETURN #simulatorFail. Now, this brings us into big, big, trouble. Since the simulation thinks that the lookup in the symbol table failed, it hands over control to the smalltalk code. Now, this code is Object>>at: in our case and the error code says that if the argument is an integer it has to be out of range for the primitive to fail. Since the argument *is* an integer this leads to an errorSubscriptBounds: leading to the raise of a debugger, leading to a new window being opened, leading to a new process being forked --- all from within the simulation which finally leads to a system crash. Q.E.D. That's it, Andreas PS. How to solve this?! Well, most likely by making a special singleton symbol not showing up in the symbol table for indicating primitive failure (for instance by using the #clone primitive which - by the way - works on Symbols even though it shouldn't ;-). -- Linear algebra is your friend - Trigonometry is your enemy. +===== Andreas Raab ============= (raab(a)isg.cs.uni-magdeburg.de) =====+ I Department of Simulation and Graphics Phone: +49 391 671 8065 I I University of Magdeburg, Germany Fax: +49 391 671 1164 I +=============< http://isgwww.cs.uni-magdeburg.de/~raab >=============+

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