[Vm-dev] Re: [Pharo-dev] Corrupt BlockClosure

Fri May 24 04:44:45 UTC 2013

On 23.05.2013, at 22:58, Camille Teruel <camille.teruel at gmail.com> wrote:

> Hi,
> 
> This is indeed strange, the BlockClosure has an incorrect startpc (31 instead of 43). You can fix it with: 
> theBlock instVar: 2 put: 43. 
> The wrong startpc corresponds to the beginning of the block in the previous version of the method (DFSession>>#numberOfMethodCalls), but I don't know why.

Would it help to recompile the method?

> I don't know fuel enough but could it be because the method of the block changed between serialization and materialization?

No, there was never a materialization of that session.

> 
> Camille 
> 
> On 23 mai 2013, at 21:02, Max Leske wrote:
> 
>> Hi Marcus
>> 
>> Roberto sent this mail to the Fuel-dev list. When we looked at the problem we noticed that serialization fails because of a corrupt BlockClosure. Since that's not really our territorry Mariano suggested to forward this to you.
>> 
>> The image with the corrupt BlockClosure is available here: https://dl.dropboxusercontent.com/u/6281855/DFlow-SubscriptOutOfBounds.zip.
>> To see the stack, right click on the only entry in the right window and click "export session". You'll find the corrupt BlockClosure at BlockClosure>>fuelAccept:
>> 
>> @Roberto
>> Is it possible to reproduce the stack with a new session? Or did this only happen once?
>> 
>> 
>> Cheers,
>> Max
>> 
>> 
>> Begin forwarded message:
>> 
>>> From: Mariano Martinez Peck <marianopeck at gmail.com>
>>> Subject: Re: [Pharo-fuel] [Fuel] SubscriptOutOfBounds: 27
>>> Date: 23. Mai 2013 14:23:45 MESZ
>>> To: The Fuel Project <pharo-fuel at lists.gforge.inria.fr>
>>> Reply-To: The Fuel Project <pharo-fuel at lists.gforge.inria.fr>
>>> 
>>> Indeed, it would be nice if you can known which CompiledMethod and blockclosure are having the problem. Not only the source code but the real bytecodes.
>>> Also, can you isolate and just try to serialize them alone and reproduce the problem? In other words, a reproducible test case? :)
>>> Thanks!
>>> 
>>> 
>>> On Thu, May 23, 2013 at 8:41 AM, Max Leske <maxleske at gmail.com> wrote:
>>> What's the compiled method? Is it a special one? Which selector in which class?
>>> 
>>> Max
>>> 
>>> On 23.05.2013, at 12:45, "roberto.minelli at usi.ch" <roberto.minelli at usi.ch> wrote:
>>> 
>>> > Hi,
>>> >
>>> > While using Fuel in a 2.0 image to serialize some objects (including CompiledMethods) I'm getting this error: SubscriptOutOfBounds: 27.
>>> >
>>> > I spent hours in the debugger before writing this email, but I'm not able to figure out why this is happening. I attach the full stack of the error (STACK#1).
>>> >
>>> > I understood that it has something to do with a particular CompiledMethod in my image and/or a BlockClosure which for some reason cannot be printed (i.e., the printString returns <error in printString: evaluate "self printString" to debug>) and when I try to printString to debug I got the STACK#2 which in turn does not bring me to any possible solution.
>>> >
>>> > Hope some of you will have an intuition on that or at least tell me where to look or how to script a possible workaround.
>>> >
>>> > Thanks in advance,
>>> > Roby
>>> >
>>> > ############################################################################################
>>> > ######################################### STACK#1 ###########################################
>>> > ###########################################################################################
>>> > CompiledMethod(Object)>>errorSubscriptBounds:
>>> > CompiledMethod(Object)>>at:
>>> > InstructionStream>>interpretNextInstructionFor:
>>> > CompiledMethod>>abstractBytecodeMessageAt: in Block: [(InstructionStream new method: self pc: pc)...
>>> > BlockClosure>>on:do:
>>> > CompiledMethod>>abstractBytecodeMessageAt:
>>> > BlockClosure>>blockCreationBytecodeMessage
>>> > BlockClosure>>endPC
>>> > BlockClosure>>abstractBytecodeMessagesDo:
>>> > BlockClosure>>isClean
>>> > BlockClosure>>shouldBeSubstitutedByCleanCopy
>>> > BlockClosure>>fuelAccept:
>>> > FLFullGeneralMapper(FLLightGeneralMapper)>>mapAndTrace:
>>> > FLFullGlobalMapper>>mapAndTrace: in Block: [(anObject class == CompiledMethod...
>>> > FLLargeIdentityDictionary>>at:ifAbsent:
>>> > FLFullGlobalMapper>>mapAndTrace:
>>> > FLPluggableSubstitutionMapper>>mapAndTrace:
>>> > FLPluggableSubstitutionMapper>>mapAndTrace:
>>> > FLAnalysis>>mapAndTrace:
>>> > FLAnalysis>>run
>>> > FLAnalyzer>>setDefaultAnalysis in Block: [:anObject | (FLAnalysis...
>>> > FLAnalyzer>>analysisFor:
>>> > FLSerialization>>analysisStep
>>> > FLSerialization>>run
>>> > DFSerializer(FLSerializer)>>setDefaultSerialization in Block: [:anObject :anEncoder | (FLSerialization...
>>> > DFSerializer(FLSerializer)>>serialize:on: in Block: [:anEncoder | ...
>>> > FLEncoder class>>on:globalEnvironment:do: in Block: [aBlock value: anEncoder]
>>> > BlockClosure>>ensure:
>>> > FLEncoder class>>on:globalEnvironment:do:
>>> > DFSerializer(FLSerializer)>>serialize:on:
>>> >
>>> >
>>> > ############################################################################################
>>> > ######################################### STACK#2 ###########################################
>>> > ############################################################################################
>>> > Decompiler(Object)>>error:
>>> > Decompiler>>decompileBlock:
>>> > BlockClosure>>decompile
>>> > BlockClosure>>printOn:
>>> > BlockClosure(Object)>>printStringLimitedTo: in Block: [:s | self printOn: s]
>>> > String class(SequenceableCollection class)>>streamContents:limitedTo:
>>> > BlockClosure(Object)>>printStringLimitedTo:
>>> > BlockClosure(Object)>>printString
>>> > BlockClosure>>DoIt
>>> > Compiler>>evaluate:in:to:notifying:ifFail:logged:
>>> > SmalltalkEditor>>evaluateSelectionAndDo: in Block: [rcvr class evaluatorClass new...
>>> > BlockClosure>>on:do:
>>> > SmalltalkEditor>>evaluateSelectionAndDo:
>>> > SmalltalkEditor>>evaluateSelection
>>> > PluggableTextMorph>>doIt in Block: [textMorph editor evaluateSelection]
>>> > PluggableTextMorph>>handleEdit: in Block: [result := editBlock value]
>>> > TextMorphForEditView(TextMorph)>>handleEdit:
>>> > PluggableTextMorph>>handleEdit:
>>> > PluggableTextMorph>>doIt
>>> > SmalltalkEditor class>>buildSmalltalkEditorKeymappingsOn: in Block: [:morph | morph doIt]
>>> > BlockClosure>>cull:
>>> > BlockClosure>>cull:cull:
>>> > BlockClosure>>cull:cull:cull:
>>> > KMCategoryTarget>>completeMatch:buffer:
>>> > KMKeymap>>notifyCompleteMatchTo:buffer: in Block: [:l | l completeMatch: self buffer: aBuffer]
>>> > Array(SequenceableCollection)>>do:
>>> > KMKeymap>>notifyCompleteMatchTo:buffer:
>>> > KMKeymap>>onMatchWith:notify:andDo:
>>> > KMCategory>>onMatchWith:notify:andDo: in Block: [:entry | entry...
>>> > Set>>do:
>>> >
>>> >
>>> >
>>> > _______________________________________________
>>> > Pharo-fuel mailing list
>>> > Pharo-fuel at lists.gforge.inria.fr
>>> > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-fuel
>>> 
>>> _______________________________________________
>>> Pharo-fuel mailing list
>>> Pharo-fuel at lists.gforge.inria.fr
>>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-fuel
>>> 
>>> 
>>> 
>>> -- 
>>> Mariano
>>> http://marianopeck.wordpress.com
>>> _______________________________________________
>>> Pharo-fuel mailing list
>>> Pharo-fuel at lists.gforge.inria.fr
>>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-fuel
>> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.squeakfoundation.org/pipermail/vm-dev/attachments/20130524/ac57ad2a/attachment.htm