VM-beginners May 2011

vm-beginners@lists.squeakfoundation.org

8 participants
10 discussions

How difficult is to fix this keyboard input issue?
by Guillermo Polito 01 Jun '11

01 Jun '11

Hi! In order to have a decent keybinder/keymapping/shortcut package, we need to fix this crap: http://code.google.com/p/pharo/issues/detail?id=3748&q=events&colspec=ID%20… :) I don't know if someone can take a look. Maybe it's easy to fix, maybe it's not :S. Maybe someone can just give some directions :). Thanks! Guille

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Installing on CentOS 5
by Sean P. DeNigris 29 May '11

29 May '11

What's the best (easiest) way to install the Squeak VM on CentOs 5? This is what I found out so far: * There are prebuilt versions for "Intel x86 GNU/Linux" & "Intel x86 FreeBSD" at http://www.squeakvm.org/unix/ * .rpm files are mentioned, but do not seem to exist for current versions. Thanks. Sean -- View this message in context: http://forum.world.st/Installing-on-CentOS-5-tp3557663p3557663.html Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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Objective C Test Failures
by Sean P. DeNigris 20 May '11

20 May '11

4 tests are failing due to the following error: (ObjectiveCBridge classObjectForName: 'UIApplication') sharedApplication. #sharedApplication -> DNU. (The error seems to be in the primitive primitiveGetMethodSignatureForSelectoron:, which returns 0 as an external memory address). Steps taken so far: 1. I checked the Apple docs and everything seems correct. 2. I successfully evaluated the following in the same image as a sanity check: bundle := ObjectiveCObject findClassName: 'NSBundle'. aBundle := bundle bundleWithPath: '/Applications/Mail.app' asNSStringUTF8. aBundle bundleIdentifier asString. What is going on here? Thanks. Sean -- View this message in context: http://forum.world.st/Objective-C-Test-Failures-tp3536795p3536795.html Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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Two Questions
by Chris Cunnington 13 May '11

13 May '11

>> Computer memory is always just that... and even arguably even just numbers between 0 and 1 ;-) Well, of course your right. I wasn't going to say this, but for a few hours afterward I was walking around asking how everything I saw could be represented as a ByteArray. It was kind of weird. I snapped out of it eventually. :) Chris

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Re: [Vm-beginners] Two Questions
by Marcus Denker 13 May '11

13 May '11

On May 13, 2011, at 10:37 PM, Chris Cunnington wrote: > Yea, I think I get it. I was shocked when I realized that MicroSqueak was creating a file that was filled only with an endless series of numbers between 0-255. It's as though somebody took a three dimensional world and flattened it. Computer memory is always just that... and even arguably even just numbers between 0 and 1 ;-) Marcus -- Marcus Denker -- http://www.marcusdenker.de INRIA Lille -- Nord Europe. Team RMoD.

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Two Questions
by Chris Cunnington 13 May '11

13 May '11

Yea, I think I get it. I was shocked when I realized that MicroSqueak was creating a file that was filled only with an endless series of numbers between 0-255. It's as though somebody took a three dimensional world and flattened it. On the flip side, the seemingly big problem of creating an application that makes new, customizable images/object memories has everything in common with any ByteArray. So from that point of view, it seems a less formidable thing. Thanks, Chris

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Two Questions
by Chris Cunnington 13 May '11

13 May '11

Ok, yea. I see that. At some point Alice has to go down the rabbit hole. The depiction of events in Smalltalk has to stop making sense at some point. So, #dispatchOn:in: ceases to refer to things on this level of abstraction. For the second question, I think I've been having a problem grokking what ObjectMemory is. What's the depiction of memory between regular objects as I see them in a browser and the RAM? Hmmm... that'd be ObjectMemory itself. MicroSqueakImageBuilder creates a ByteArray. That gets pulled into ObjectMemory>>#memory. And the #specialObjectsOop gets pulled in from the same ByteArray. (Well, it's a binary at this point.) In the same way that MicroSqueakImageBuilder saved a ByteArray and it became a fresh, new image. After we've changed the state of the image, and we Snapshot&Quit, I guess the contents of Object>>#memory get filed into that same image with altered state. Thanks, Chris

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Two Questions
by Chris Cunnington 13 May '11

13 May '11

1. Why is #dispatchOn:in: , which looks to be the heart of Interpreter>>#interpret, in a subclass InterpeterSimulation? That class is likely only used if there is a simulation going on, yet the essential #dispatchOn:in: is in the subclass, where I'd suppose it can't be reached. 2. What is the specialObjectsOop? It's a number. OK, what what is the context of that number? It's not some memory address in RAM, because I think we're abstracted above that. And the oopMap I'm looking at MicroSqueak is an IdentitySet. Something is amiss here. This specialObjectsOop is not fish (RAM memory) and it's not fowl (an object). I'd suppose the point of the specialObjectsOop is as a starting point. You load the SpecialObjectsArray into the ObjectMemory and I guess you do that by saying "start here" with the specialObjectsOop. What is the context of that number? Is there a bank of addresses in the object memory or interpreter that simulate the memory addresses of the RAM? Any help would be greatly appreciated, Chris

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Objective-C
by Sean P. DeNigris 02 May '11

02 May '11

How do I call objective-C code from Squeak/Pharo? The following tests were done with the Squeak 4.2.5beta1U VM... I loaded the "Objective-C bridge 2" project from SqS, and about half the tests passed in Pharo 1.1.1. Evaluating: bundle := ObjectiveCBridge classObjectForName: 'NSBundle'. "also tried ObjectiveCObject>>findClassName:" aBundle := bundle bundleWithPath: '/Applications/Mail.app'. Led to a primitive failure: primitivePerformSelector: aSelectorOop on: aClassorInstanceOop with: argument1 <primitive: 'primitivePerformSelectorWith' module: 'ObjectiveCPlugin'> self primitiveFailed I tried the "ObjectiveCBridge" project in Squeak 4.2 final... Evaluating: bundle := NSBundle bundleWithPath: '/Applications/Mail.app'. Led to a different primitive failure: primitiveIdFromString: aString <primitive: 'primitiveIdFromString' module: 'ObjectiveCPlugin'> ^self primitiveFailed Thanks. Sean-- View this message in context: http://forum.world.st/Objective-C-tp3487777p3487777.html Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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Objective-C Bridge Memory Management
by Sean P. DeNigris 02 May '11

02 May '11

How does Obj-C garbage collection map to Squeak? For example: * When an Obj-C object is garbage collected in Squeak, is the release propagated back to Obj-C (does it even have to be)? * Is it safe to autorelease objects? What is the "event loop" of obj-c code called from Squeak? * If objects become zombies, how long do they hang around? Are they finally destroyed when I quit the image? Thanks. Sean-- View this message in context: http://forum.world.st/Objective-C-Bridge-Memory-Management-tp3489203p348920… Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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VM-beginners May 2011