Are you able to tell what's in the script he's running simply from the 
stack trace? Or some other way?

Cheers,
Bob

On 9/25/13 9:12 AM, Nicolas Cellier wrote:
> The problem is that the script you evaluate will update the Compiler...
> New updates will remove unused variables before the script is finished...
> I tried to solve the problem by introducing an intermediate step:
> - 1) publish the modified methods in an update.mcm (I reintroduced the 
> missing vars)
> - 2) only then remove the inst. var.
> (See the recent serie of Compiler versions 270->274
>
> This did not solve anything because there are always cases when you 
> launch the script from an older image (typically from Squeak 4.4, 4.3 
> or even older)
> The same old Compiler instance is used during all the process and it 
> must be unmodified during the process, otherwise, undefined behavior 
> (SEGV included)...
>
> I see one way to workaround this:
> 1) clone the Compiler class
> 2) instantiate the clone
> 3) let the clone evaluate
>
> In fact, to be safer we should clone the whole hierarchy, but you 
> could 1st try simply with Compiler...
>
>
> 2013/9/25 Bob Arning <arning315 at comcast.net 
> <mailto:arning315 at comcast.net>>
>
>     Just type
>
>     PositionableStream>>#fileInAnnouncing:
>
>     and explore it. Look for the literal pointing to the compiler
>     (literal8 here). Toggle that open and toggle open the value. Look
>     at the instanceVariables - does it still have sourceStream?
>
>     As to the explorer, did you open one? Is it still open? (The
>     PointerFinder says it is) Could it have been open when the image
>     was last saved?
>
>
>     Also, you could do
>
>     Behavior allSubInstances select: [ :e | (e asString findString:
>     'Compiler') > 0]
>
>     Do you get: an OrderedCollection(ClosureCompilerTest CompilerTest
>     CompilerExceptionsTest CompilerNotifyingTest
>     CompilerSyntaxErrorNotifyingTest Compiler ClosureCompilerTest
>     class CompilerTest class CompilerExceptionsTest class
>     CompilerNotifyingTest class CompilerSyntaxErrorNotifyingTest class
>     Compiler class)
>
>
>     Cheers,
>     Bob
>
>     On 9/25/13 7:31 AM, Frank Shearar wrote:
>>     I don't know how I would do that. The bytecode just says pushLit: Compiler.
>>
>>     But if I say Compiler allInstances collect: [:c | c instVarNamed:
>>     'cue'] I see {nil . a CompilationCue . a CompilationCue}. That first
>>     one's a problem! Further, my image has an ObjectExplorer (!) hanging
>>     onto that Compiler, coming from I don't know where.
>>
>>     frank
>>
>>     On 25 September 2013 11:53, Bob Arning<arning315 at comcast.net>  <mailto:arning315 at comcast.net>  wrote:
>>>     If you inspect
>>>
>>>     PositionableStream>>#fileInAnnouncing:
>>>
>>>     and look at the literal for Compiler, does it look to be pointing to the new
>>>     or old Compiler?
>>>
>>>     Cheers,
>>>     Bob
>>>
>>>     On 9/25/13 6:12 AM, Frank Shearar wrote:
>>>
>>>     I'm running with Compiler-nice.274.
>>>
>>>     What's weirder is in that top stack frame (Compiler >>
>>>     #evaluate:in:to:notifying:ifFailed:logged: the following all show up
>>>     as red, because they're references to instvars that don't exist:
>>>     class, sourceStream, context, requestor.
>>>
>>>     That's because the CompiledMethod that's running is not actually the
>>>     right CompiledMethod! It's from some ancient pre-CompilationCue
>>>     Compiler instance. Or at least so I suspect because that Compiler
>>>     instance has a nil 'cue' instvar.
>>>
>>>     If it helps, the PointerFinder says this of the offending context:
>>>
>>>     globals: Environment
>>>     declarations: IdentityDictionary
>>>     #World -> PasteUpMorph
>>>     submorphs: Array
>>>     1: SystemWindow
>>>     model: ObjectExplorer
>>>     currentSelection: ObjectExplorerWrapper
>>>     item: CompiledMethod
>>>
>>>     In contrast, PointerFinder on: (Compiler >>
>>>     #evaluate:in:to:notifying:ifFail:logged:) says:
>>>
>>>     CLASS: SmalltalkImage class
>>>     superclass: Object class
>>>     subclasses: Array
>>>     445: Compiler class
>>>     methodDict: MethodDictionary
>>>     array: Array
>>>     39: CompiledMethod.
>>>
>>>
>>>
>>>
>>>
>
>
>
>
>
>
>

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