Squeak-dev November 2008

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119 participants
135 discussions

[ANN] Pattern matching and rewriting rules added to FunctionalTalk
by Stéphane Rollandin 24 Nov '08

24 Nov '08

hello list the package LambdaMessageSend, aka FunctionalTalk, has been extended to support pattern matching, rewriting rules and unification (as in http://en.wikipedia.org/wiki/Unification). it is available on SqueakMap. an example of what can be done: | x | x _ Lambda x type: NumericSlot. AlgebricUnificationDictionary unify: ((2 * x) sqrt) -> 4 ...which returns a Dictionary with x -> 8 this is a work in progress; any feedback welcome Stef

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Re: [squeak-dev] Re: Bug with valueWithReceiver:arguments:
by Antoine Marot 23 Nov '08

23 Nov '08

Hi all, Do you know when this fix will be added in a new squeak vm release ? I really need it for my thesis... So I tried to build the vm (without VMMaker since it doesn't want to be loaded...). This is how I tried to fix the interp.c file (it's probably wrong since this doesn't fix anything) : sqInt primitiveExecuteMethod(void) { register struct foo * foo = &fum; sqInt top; sqInt successValue; sqInt primIdx; sqInt nArgs; sqInt delta; sqInt primBits; /* begin popStack */ top = longAt(foo->stackPointer); foo->stackPointer -= BytesPerWord; foo->newMethod = top; /* begin primitiveIndexOf: */ primBits = (((usqInt) (longAt((foo->newMethod + BaseHeaderSize) + (HeaderIndex << ShiftForWord)))) >> 1) & 268435967; foo->primitiveIndex = (primBits & 511) + (((usqInt) primBits) >> 19); /* begin success: */ successValue = (foo->argumentCount - 1) == ((((usqInt) (longAt((foo- >newMethod + BaseHeaderSize) + (HeaderIndex << ShiftForWord)))) >> 25) & 15); foo->successFlag = successValue && foo->successFlag; if (foo->successFlag) { foo->argumentCount -= 1; /* begin executeNewMethod */ if (foo->primitiveIndex > 0) { /* begin primitiveResponse */ if (DoBalanceChecks) { nArgs = foo->argumentCount; delta = foo->stackPointer - foo->activeContext; } primIdx = foo->primitiveIndex; foo->successFlag = 1; dispatchFunctionPointerOnin(primIdx, primitiveTable); if (DoBalanceChecks) { if (!(balancedStackafterPrimitivewithArgs(delta, primIdx, nArgs))) { printUnbalancedStack(primIdx); } } if (foo->successFlag) { goto l1; } } activateNewMethod(); /* begin quickCheckForInterrupts */ if ((foo->interruptCheckCounter -= 1) <= 0) { checkForInterrupts(); } l1: /* end executeNewMethod */; foo->successFlag = 1; } else { /* begin unPop: */ foo->stackPointer += 1 * BytesPerWord; } } Basically, I just added "foo->successFlag = 1;" after /* end executeNewMethod */;. Cheers, Antoine > Date: Oct 28, 2008; 12:55am > Author: Eliot Miranda-2 > Squeak - Dev (http://www.nabble.com/Squeak---Dev-f14154.html) > Well I actually wrote the fix as > > primitiveExecuteMethod > "receiver, args, then method are on top of stack. Execute method > against receiver and args" > newMethod := self popStack. > primitiveIndex := self primitiveIndexOf: newMethod. > self success: argumentCount - 1 = (self argumentCountOf: newMethod). > successFlag > ifTrue: [argumentCount := argumentCount - 1. > self executeNewMethod. > "Recursive xeq affects successFlag" > successFlag := true] > ifFalse: [self unPop: 1] > > to agree with the perform code. The fix is to ensure that > successFlag is true. >

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Bug in 3.10.2 - browser / moving classes
by Mr. Timothy C. Johnson 23 Nov '08

23 Nov '08

Hi, I had two browser windows open (standard 3.10.2 default browsers). They were both open to the same class category. In one browser, I moved a number of methods out of that category into another one (via drag-and-drop). After moving about 5 or 6 methods, I got an error: subscript out of bounds, in World. I selected "proceed" and I looked over at the other browser (the one in which I hadn't made any changes), and its classes list pane had become an invalid rectangle (a red rectangle with a yellow X inside). Browsing to other categories in the troubled browser does not restore the class category pane to operation. A new browser is fine. Using 3.10.2 on latest Mac PPC VM. - TimJ

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Rio File/Directory
by Keith Hodges 23 Nov '08

23 Nov '08

Just to let you guys know, A while back I did the work of moving Rio over to use classes File and Directory, and String>>asFile and String>>AsDirectory. I am tempted to leave it that way for now (i dont have time to do otherwise for a bit) since I do want to propose it as a standard thing that could be in Squeak/Pharo/Whatever. Code size stats: self compiledSize: 'File-Kernel'. 6906 (for Kernel Images) self compiledSize: 'File-Base'. 8215 (includes some ftp remote directory support) self compiledSize: 'Files-Directories'. 11471 self compiledSize: 'FileMan-Core'. 7098 self compiledSize: 'Network-RemoteDirectory'. 21481 regards Keith

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[ANN] Lightweight Class Browser
by Hernán Morales Durand 23 Nov '08

23 Nov '08

Dear squeak friends, For the brave soul and lonely heart, a super experimental and untested version of the Lightweight Class - Aristotelic - Browser, based on the OmniBrowser framework, is available in SqueakSource. I have used it successfully for debugging nasty user interface objects, but you can use it for debugging almost any kind of instance or as an Instances Browser too. Now let's back to hard reality: -Modifying some instances will break the system for sure. -Lightweight metaclass is unsupported and I think doesn't make much sense for most developers. -Keep in mind that while you are referencing instances in the browser, they won't be garbage collected. -Adding messages work but the browser doesn't show them. -There's a lot of things to do, the most important is adding filters to show the inherited protocol in the messages list pane and attach properly some menus. -I have not enough time to fix bugs now, but if anyone is interested in just send me an e-mail. Requirements: OmniBrowser packages: (package versions I've used to write it, however could work with previous versions) OmniBrowser 0.426 OmniBrowser-Morphic 0.61 OmniBrowser-Standard 0.369 OB-Enhacements 0.247 Installation: http://www.squeaksource.com/LightweightClasses.html Use: From the World Menu, Open and then Lightweight Class Browser. Editing a method will modify the behavior in the selected instance in the browser, that's the whole thing about. By the way I've attached a beautiful screenshot of the browser. Hernán

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Editing a wiki page...
by Ian Trudel 23 Nov '08

23 Nov '08

Hello all, I was trying to edit a page on Squeak's Swiki and a log-in box popped-up. Either I should register somewhere (where?) or it is not the intended behaviour. Is there something wrong? For example, on http://wiki.squeak.org/squeak/1013 (The Future of Squeak, 1999 named: 'myProject') enter Should rather be: (Project named: 'myProject') enter Ian.

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Lightweight Classes
by Hernán Morales Durand 23 Nov '08

23 Nov '08

Dear all, In the attachment you will find an implementation of Lightweight Classes for Squeak that follows the original paper "Debugging Objects" of Hinkle et al. However I was unable to set up the #class method in the LightweightClass to answer the real class of the lightwighted object, is this possible currently in Squeak?. What I did: -Created the LightweightClass as in the old VisualWorks implementation. The only difference here was CompiledMethod's cannot be copied, so I used #clone. -Created and installed an UnstoredMethod (a CompiledMethod subclass) in the LightweightClass's methodDictionary. Since I want to store the source code but not through the changes log, I borrowed the MethodWrappers idea of storing the state (sourceCode) in a class instance variable, and compile without logging. The methods I borrowed from MW are: -#copyWithTrailerBytes: - I think the superimplementor in CompiledMethod could use "self class" to avoid reimplementors. -#tweakClassFormat - which set the format but I don't know why and cannot find documentation on this. -#objectAt: I suspected the class literal was stored in the literal frame everytime I accepted a method, but for the simple test below still answer the LightweightClass and not the real class. Here is the test: | aDate | aDate := Date today. aDate becomeLightweight. aDate dispatchingClass compile: 'day ^43' notifying: nil. aDate day. " 43 (works) " aDate perform: #class. " Date ------> (works) " aDate class. " {Date} ------> LightweightClass (wrong) " Any hint would be appreciated. Best regards. Hernán PS: Just to avoid duplicate efforts, I wrote a LightweightClasses Browser which will be available as soon as I find a solution to the problem above.

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Assignment vs binary selector
by Igor Stasenko 22 Nov '08

22 Nov '08

I wonder, if expression a :== 5 having right to live? Since there is no restrictions on binary selectors length, a #:= followed by any binary char(s) can be treated as binary selector instead of assignment, followed by syntax error. What you think? -- Best regards, Igor Stasenko AKA sig.

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what is holding back Smalltalk?
by Mark Volkmann 22 Nov '08

22 Nov '08

I don't have a lot of experience with Smalltalk yet, but I really love what I've seen so far. I'm curious what experienced Smalltalkers see as some of the reasons why it doesn't attract more attention. I understand the issues with Smalltalk in the past related to license costs and performance, but those have been addressed now. Have you tried to convince someone to consider Smalltalk and failed to convince them? Why do you think they rejected it? What improvements could be made to current Smalltalk environments, especially Squeak, that might sway them? For me the biggest issue has been trying to run my code from outside Squeak. This includes running Squeak headless to do something script- like and configuring a GUI application to run in a way that doesn't require the user to know they are running Squeak. Both of these are supposedly possible, but very difficult to get right. --- Mark Volkmann

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Freedom and Copyright (was Re: [squeak-dev] Re: what is holding back Smalltalk?)
by Edgar J. De Cleene 22 Nov '08

22 Nov '08

Once computers fill huge rooms and cost million dollars, not today. Once knowledge was only for few, who try to keep for themselves. Now Internet provides sources of knowledge for many. In many countries , people don't care about licenses, they piracy any software they need. At some point in the non distant future, the trouble could be not who have the rights. Edgar

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