VM-beginners December 2011

vm-beginners@lists.squeakfoundation.org

5 participants
4 discussions

Fwd: Oops - I put a halt in a startup method
by Sean P. DeNigris 10 Jan '12

10 Jan '12

From http://forum.world.st/Oops-I-put-a-halt-in-a-startup-method-td3800163.html : My image appears for an instant and then crashes. Is there any way to recover from this? I made some progress, but I'm not sure I'm on the right track... I built a debug VM and found primitivePerform, which is apparently called by the following: FeaturesDB perform: #startUp: with: resuming How will I know which call to skip/break on? Maybe there is there a way, from the VM side, to get the receiver class name as a string? If I knew that the receiver was FeaturesDB, that would be the one... And then once I have the right call, can I just skip over it? Sean -- View this message in context: http://forum.world.st/Fwd-Oops-I-put-a-halt-in-a-startup-method-tp3800729p3… Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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[ANN] ExperimentalBit [WAS] Re: Out of the box primitives for bit in ObjectHeader?
by Mariano Martinez Peck 25 Dec '11

25 Dec '11

Hi guys. Last days I needed to migrate some old code I used to have in the VM for tracing objects usage. Luc Fabresse wanted also to be able to set and get the value of a bit in the object header to do some experiments. So...we thought it was a good idea to make it abstract an public. So....the following is only one morning work we did together with Luc, so don't expect that much. What we did is to do a very small change in the VM to use one free bit in the object header, and then we coded 3 primitives: one to get the value, one to set it and one to unmark all objects. The idea is that you can use this code and give semantics to the bit. This is just for experimenting and prototypes, not for production code since such bit in the object header may not be available. To download: Gofer it url: 'http://ss3.gemstone.com/ss/ExperimentalBit'; package: 'ConfigurationOfExperimentalBit'; load. Now.... you can read ConfigurationOfExperimentalBit class comment: --------------- ExperimentalBit is a small facade for setting and getting the value of a bit in the Object Header. It requires a special VM which supports the primitives to set and get the value of such bit. You can get a already compiled MacOSX VM from: https://gforge.inria.fr/frs/download.php/30042/CogMTVM-ExperimentalBit.zip. For more details read class comment of ExperimentalBitHandler. If you already have a compiled VM with the required primitives, then you can just load the image side part evaluating: ((Smalltalk at: #ConfigurationOfExperimentalBit) project version: '1.0') load. If you want to build a VM with the primitives we need, you need to download: ((Smalltalk at: #ConfigurationOfExperimentalBit) project version: '1.0') load: 'VMMakerGroup'. And then follow the steps to build the VM: - http://code.google.com/p/cog/ - http://code.google.com/p/cog/wiki/Guide ----------- And here ExperimentalBitHandler class comment: ----------- ExperimentalBitHandler is a small facade for setting and getting the value of a bit in the Object Header. It requires a special VM which supports the primitives to set and get the value of such bit. You can get a already compiled MacOSX VM from: https://gforge.inria.fr/frs/download.php/30042/CogMTVM-ExperimentalBit.zip. To know which version of the VM you have to use to compile, check the dependencies in ConfigurationOfExperimentalBit and also the 'description' of it. For example, if version 1.0 it depends on 'CogVM' version '3.7'. In the description of version 1.0 you can also read that the used Git version of the platform code was 4a65655f0e419248d09a2502ea13b6e787992691 from the blessed repo. Basically, there are 3 operations: set the bit to a specific, get the value of the bit and turn off the bit of all objects. Examples: 'aString' experimentalBit: true. 'astring ' experimentalBit. Date today experimentalBit: false. Date today experimentalBit. ExperimentalBitHandler turnOffExperimentalBitOfAllObjects. For more details see ExperimentalBitTest. ------------- Happy Christmats for all the Smalltalk hackers!!! -- Mariano http://marianopeck.wordpress.com

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Got "Error: basicNew: failed" when running InterpreterSimulator
by Nick. 21 Dec '11

21 Dec '11

Hi guys! In the past few days i tried to get InterpreterSimulator running without success. First of all, a little context about my goal: I'm digging into the VM because i would like to be able to delegate to some class (that I'll develop) the responsibility for, say, the method lookup algorithm. With that in mind, here's what i've been doing: Using the Pharo 1.2 image Mariano Peck's prepared in his exellent article (http://marianopeck.wordpress.com/2011/04/23/how-to-debug-the-vm/), loaded the VMMaker package with the following script: Deprecation raiseWarning: false. Gofer new squeaksource: 'MetacelloRepository'; package: 'ConfigurationOfCog'; load. (Smalltalk at: #ConfigurationOfCog) project latestVersion load. Once it finishes (without errors) I "Save As" the current image as "demo.image", close it and open the original Pharo 1.2 image that Mariano provided. When, for example, I run: (CogVMSimulator new openOn: 'demo.image') test or (InterpreterSimulatorLSB new openOn: 'demo.image') test I get the following error: "Error: basicNew: failed" (see attached images at the end). When I tried to load VMMaker in the Pharo 1.3 OneClick release, I got another error (see attached images at the end). Am I doing something wrong? Are those the right simulators to use? I can tell the difference between all that are available in VMMaker package. Thanks in advance! Nick http://forum.world.st/file/n3835723/error_while_trying_to_run_InterpreterSi… http://forum.world.st/file/n3835723/Error_while_loading_VMMaker_in_Pharo-1.… -- View this message in context: http://forum.world.st/Got-Error-basicNew-failed-when-running-InterpreterSim… Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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Plugin Example
by Sean P. DeNigris 06 Dec '11

06 Dec '11

What's a well-designed plugin to learn from? Sean -- View this message in context: http://forum.world.st/Plugin-Example-tp4163741p4163741.html Sent from the Smalltalk VM - Beginners mailing list archive at Nabble.com.

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VM-beginners December 2011