Squeak-dev November 2003

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174 participants
566 discussions

[ENH] InspectorEnh-ajh
by marcus＠ira.uka.de 01 Dec '03

01 Dec '03

md: just tested under 3.7a. works ok. the functionality is quite nice, and we allready have special Inpectors for Dictionary... from preamble: "Change Set: InspectorEnh-ajh Date: 22 June 2003 Author: Anthony Hannan Adds #inspectorClass protocol that #inspect calls to find the appropriate inspector for the receiver. #basicInspect uses a new generic inspector called BasicInspector. CompiledMethods use a new inspector class call CompiledMethodInspector, which display mnemonic bytecode instructions and literals. An inspector will change to the appropriate class when being updated with a new receiver. String asExplorerString has been changed to print its normal printString. "!

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Re: Redirecting messages on the VM
by Alejandro F. Reimondo 01 Dec '03

01 Dec '03

Hi Javier, > For this research work I have to write a set of tools that allows > the user to define what should be done when a given object > receives a given message. [...snip...] > Is there a better way to do this? > Where any of my ideas right? What was > wrong in their implementation? In some smalltalks you have the posibility to attach a method dictionary to an object. Then the method lookup starts in the object and then (if you linked the mthdict of the object to it's class) go as usual... It let you change dynamically the behavior of an object without change the species. And let you model instance based behavior without breaking the rules of inheritance from species. cheers, Ale. ----- Original Message ----- From: "Javier Lanatta" <javier(a)lanatta.com.ar> To: <squeak-dev(a)lists.squeakfoundation.org> Sent: Sunday, November 30, 2003 8:15 PM Subject: Redirecting messages on the VM > Hi everybody, > I'm doing a research work for my OOD class at university and I'm a > little lost... So I come here looking for your help :) I'm sorry to tell you > that this email is gonna be kinda long, anyway I will try to write only the > most relevant things. > > For this research work I have to write a set of tools that allows > the user to define what should be done when a given object receives a given > message. > These are examples of what the tools must do: > - When a given instance of RectangleMorph receives #addMorph: this > should be logged and then the instance finally receives the #addMorph: > - When any instance of Array receives #add: this message should be > sent to the instance only if the add's argument belongs to a given class. > > I have most of the model finished. But I have problems intercepting > the messages. > > By now I'm only trying to redirect every message to an object of a > fixed class to another fixed object. Both the class of the first object and > the second object are stored in the Special Objects Array. Later I will > replace the receiver with a fixed object that will act as an entry point and > it will redirect the message inside the "object's world" to other objects > that will do all the work. > > I have tried two approaches without luck. > > 1.- Replace the receiver @ Interpreter>>internalActivateNewMethod > > I overwrote the receiver after the real receiver and its arguments are > stored: > ... > ... > "Copy the reciever and arguments..." > argCount2 _ argumentCount. > 0 to: argCount2 do: > [:i | self storePointerUnchecked: ReceiverIndex+i ofObject: > newContext > withValue: (self internalStackValue: argCount2-i)]. > > "here comes my code" > rcvr _ self internalStackValue: argumentCount. > self assertClassOf: rcvr is: (self splObj: MRFAux1). > successFlag ifTrue: > [ > self print: 'Intercepting...';cr. > self storePointerUnchecked: ReceiverIndex+argumentCount ofObject: > newContext withValue: (self splObj: MRFAux2). > ]. > "and here it ends" > ... > ... > > MRFAux1: Contains the class of the object I want to intercept. > MRFAux2: Contains the receiver. > > I guess I'm storing it in the wrong position... I have tried several indexes > without any good result. > > > 2.- Send the message the same way a #doesNotUnderstand is sent @ > Interpreter>>lookupMethodInClass: class > > When the method is found in the dictionary I just send the message to the > other object creating a message in the doesNotUnderstand fashion: > > .... > .... > found _ self lookupMethodInDictionary: dictionary. > found ifTrue: [ > rcvr _ self internalStackValue: argumentCount. > self assertClassOf: rcvr is: (self splObj: MRFAux1). > successFlag ifTrue: > self print: 'Intercepting @ lookupMethodInClass...';cr. > self pushRemappableOop: (self splObj: MRFEntryPoint). > self createActualMessageTo: (self splObj: MRFEntryPoint). > rclass _ self popRemappableOop. > messageSelector _ self splObj: MRFAux2. > ^ self lookupMethodInClass: rclass > ] ifFalse: [ > ^ methodClass _ currentClass > ]. > ]. > .... > .... > MRFAux1: Contains the class of the object I want to intercept. > MRFEntryPoint: Contains the receiver. > MRFAux2: Contains the selector I want to send to the new receiver. > > In this case I cant compile the generated code :/ > > ./release/gnu-interp.o: In function `findNewMethodInClass': > //D/J4V13R/SqueakImages/TP/src/3.5.1/win32/gnu-interp.c:3388: undefined > reference to `lookupMethodInClass' > ./release/gnu-interp.o: In function `interpret': > //D/J4V13R/SqueakImages/TP/src/3.5.1/win32/gnu-interp.c:6756: undefined > reference to `lookupMethodInClass' > > I browse the gnu-interp.c file and the function lookupMethodInClass is > missiong, if I remove the lines I added the code is ok... I have no clue of > what's going on. > > Is there a better way to do this? Where any of my ideas right? What was > wrong in their implementation? > > Thanks in advance, > Javier > > > Some background information: > Squeak Version: 3.6 > Virtual Machine: 3.5.1/Tea 1.9 VM (release) from June 21 2003 I've been > using Squeak for about 9 months. > >

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Re: Redirecting messages on the VM
by Tim Rowledge 01 Dec '03

01 Dec '03

"Javier Lanatta" <javier(a)lanatta.com.ar> wrote: > For this research work I have to write a set of tools that allows > the user to define what should be done when a given object receives a given > message. Well aside from the obvious suggestion of edit the method to do what you want, the 3.6 vm has the primitive support for the idea of using any object in place of a compiled method. Take a look on SqueakMap for a package with a name like 'objects as compiled method'. Andreas is the owner so far as I recall. tim -- Tim Rowledge, tim(a)sumeru.stanford.edu, http://sumeru.stanford.edu/tim Beware of programmers who carry screwdrivers. - Leonard Brandwein

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Redirecting messages on the VM
by Javier Lanatta 01 Dec '03

01 Dec '03

Hi everybody, I'm doing a research work for my OOD class at university and I'm a little lost... So I come here looking for your help :) I'm sorry to tell you that this email is gonna be kinda long, anyway I will try to write only the most relevant things. For this research work I have to write a set of tools that allows the user to define what should be done when a given object receives a given message. These are examples of what the tools must do: - When a given instance of RectangleMorph receives #addMorph: this should be logged and then the instance finally receives the #addMorph: - When any instance of Array receives #add: this message should be sent to the instance only if the add's argument belongs to a given class. I have most of the model finished. But I have problems intercepting the messages. By now I'm only trying to redirect every message to an object of a fixed class to another fixed object. Both the class of the first object and the second object are stored in the Special Objects Array. Later I will replace the receiver with a fixed object that will act as an entry point and it will redirect the message inside the "object's world" to other objects that will do all the work. I have tried two approaches without luck. 1.- Replace the receiver @ Interpreter>>internalActivateNewMethod I overwrote the receiver after the real receiver and its arguments are stored: ... ... "Copy the reciever and arguments..." argCount2 _ argumentCount. 0 to: argCount2 do: [:i | self storePointerUnchecked: ReceiverIndex+i ofObject: newContext withValue: (self internalStackValue: argCount2-i)]. "here comes my code" rcvr _ self internalStackValue: argumentCount. self assertClassOf: rcvr is: (self splObj: MRFAux1). successFlag ifTrue: [ self print: 'Intercepting...';cr. self storePointerUnchecked: ReceiverIndex+argumentCount ofObject: newContext withValue: (self splObj: MRFAux2). ]. "and here it ends" ... ... MRFAux1: Contains the class of the object I want to intercept. MRFAux2: Contains the receiver. I guess I'm storing it in the wrong position... I have tried several indexes without any good result. 2.- Send the message the same way a #doesNotUnderstand is sent @ Interpreter>>lookupMethodInClass: class When the method is found in the dictionary I just send the message to the other object creating a message in the doesNotUnderstand fashion: .... .... found _ self lookupMethodInDictionary: dictionary. found ifTrue: [ rcvr _ self internalStackValue: argumentCount. self assertClassOf: rcvr is: (self splObj: MRFAux1). successFlag ifTrue: self print: 'Intercepting @ lookupMethodInClass...';cr. self pushRemappableOop: (self splObj: MRFEntryPoint). self createActualMessageTo: (self splObj: MRFEntryPoint). rclass _ self popRemappableOop. messageSelector _ self splObj: MRFAux2. ^ self lookupMethodInClass: rclass ] ifFalse: [ ^ methodClass _ currentClass ]. ]. .... .... MRFAux1: Contains the class of the object I want to intercept. MRFEntryPoint: Contains the receiver. MRFAux2: Contains the selector I want to send to the new receiver. In this case I cant compile the generated code :/ ./release/gnu-interp.o: In function `findNewMethodInClass': //D/J4V13R/SqueakImages/TP/src/3.5.1/win32/gnu-interp.c:3388: undefined reference to `lookupMethodInClass' ./release/gnu-interp.o: In function `interpret': //D/J4V13R/SqueakImages/TP/src/3.5.1/win32/gnu-interp.c:6756: undefined reference to `lookupMethodInClass' I browse the gnu-interp.c file and the function lookupMethodInClass is missiong, if I remove the lines I added the code is ok... I have no clue of what's going on. Is there a better way to do this? Where any of my ideas right? What was wrong in their implementation? Thanks in advance, Javier Some background information: Squeak Version: 3.6 Virtual Machine: 3.5.1/Tea 1.9 VM (release) from June 21 2003 I've been using Squeak for about 9 months.

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Redirecting messages from the VM
by Javier Lanatta 01 Dec '03

01 Dec '03

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lights in B3D
by Stéphane Rollandin 30 Nov '03

30 Nov '03

hello list, I'm exploring Balloon3D and have a hard time understanding the way lights work. I found that the two demo examples: B3DDemoSurfaces example2 B3DDemoSurfaces example3 give a dark display (in a 3.6-5424 image). I guess there is something wrong there, since the comments say things like "Two directional lights and three spotlights are used to illuminate the scene". so is there something broken in Balloon 3D lights support ? regards, Stef

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MyFreeCellOnSteroid
by smallsqueak 30 Nov '03

30 Nov '03

Image: Squeak3.7alpha - latest update: #5566 VM: Andreas' 3.6.2 (from Nov 12 2003) Platform:Windows Longhorn Evaluation copy, Build 4051. Game Package version 4 loaded from SqueakMap version 1.2. Game played: FreeCell Observation: The occupied cells got excited, jumping up and down as the cards were flying into them at the end of the game. For a snapshot: http://smallsqueak.net/MyFreeCell/MyFreeCellOnSteroid.jpg best viewed with IE6, image expanded to 100% (placing the cursor at the lower right coner of the pic) Cheers, PhiHo. P.S: BTW, is there room for improvement on the World Menu ?

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how to intercept close in a SystemWindow
by Martin Kuball 30 Nov '03

30 Nov '03

Hi! I'm building a small apllication which has some controls in a System window and which may open some other morphs. I would like to delete these other morphs when I close the SystemWindow. How can I do this? Martin

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[ENH] Enumeration of preferences
by Scott Wallace 30 Nov '03

30 Nov '03

Adds an alphabetical listing of all Preferences, each with its corresponding help-message, to the tail end of the help-window obtained when one hits the "Help" button in a Preferences panel. Based on a suggestion by Peter van Rooijen. Cheers, -- Scott

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[BUG] Wonderland broken in 3.6?
by Alain Hoang 30 Nov '03

30 Nov '03

Hi there, I've been having some problems trying to use Wonderland using Squeak 3.6-5424 full image. I asked Diego about the problem on IRC and he recommended I post this onto the email list. Description of Problem: I can open up a Wonderland just fine from either the Workspace or using open... from the popup Menu. However when I try to draw something I get a walkback when I release the mouse button and it's supposed to start the drawing. A snapshot of the walkback is available at this URL: http://samsara.bebear.net/~al/images/WonderlandWalkback.gif Possible Symptons: I looked at the walkback and it seems that it fails around WonderlandCameraMorph>>createPoohActor. After poking a little more it seems that the method constraintOutline: which PoohSubdivision inherited from Subdivision was changed compared to a version of Wonderland that I know is working. (Compared to SqueakNihongo4a.image). Platforms Tested: OS Image VM RESULT Mac OS X Squeak-3.6-5424-full Squeak3.6.1.Beta3 Walkback Windows Squeak-3.6-5424-ful Squeak3.6.2 VM Walkback Mac OS X SqueakNihongo4a Squeak3.6.1.Beta3 Okay Miscellaneous: It seems that a post by Barry Gaunt on October 10, 2003 was also made about this but there didn't seem to be any replies. It also seems sort of odd to have Wonderland listed in the open menu of the Popup Menu if it doesn't work properly. Best regards, Alain Hoang

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