cyclic looping with [0 == object] whileFalse: [object := objectnextObject].

Rob Withers reefedjib at
Tue Nov 6 16:30:12 UTC 2007

Oh shoot.   This won't work since there are new bytecodes I have compiled 
into the vm that are needed.  If someone really wants to help me investigate 
this, and I hope someone does, let me know and I can send you a Win32 VM or 
the package to allow you to compile a vm on the platform of your choice.


----- Original Message ----- 
From: "Rob Withers" <reefedjib at>
To: "Paolo Bonzini" <bonzini at>; <johnmci at>; 
"The general-purpose Squeak developers list" 
<squeak-dev at>
Sent: Tuesday, November 06, 2007 8:23 AM
Subject: Re: cyclic looping with [0 == object] whileFalse: [object := 

> ----- Original Message ----- 
> From: "Paolo Bonzini" <bonzini at>
>> This would work for Rob however.
>> Paolo
> Hi Paolo,
> That would work for me in this situation, yes.  Also, I thought that
> Andreas' use of a marker to stop iteration would also work in this
> situation.  The issue is that I caused the situation by turning off 
> ifTrue:
> inlining in the compiler (with help from others).
> This is just an intermediate step to where I really want to be, which is
> writing a macro which tests whether the receiver is Boolean, and if it is
> then run the inline form of ifTrue:, and if it is not then run the msg 
> send
> form of ifTrue:.  This would avoid the above problem by keeping things
> inlined.  I have this new compound macro coded up, compiling and some 
> basic
> tests and it works, but it makes my environment unstable.  I am getting 
> the
> emergency evaluator or outright image crashes when using it.  It is 
> driving
> me crazy, if I wasn't already.
> I am attching the Compiler package that I believe will load up for those 
> who
> may be willing to help me figure this out.  After loading into a scratch
> image, run 'Compiler recompileAll'.  Then debug 'FileList open'.   This 
> will
> show you one of the soft crashes (the emergency evaluator).  I suspect 
> that
> I don't have things I need to do syntax highlighting in the debugger for 
> the
> new macro code, but I am not sure if that is enough to cause crashes.  It
> does strange things like switch arguments, in this case a DirectoryEntry
> suddenly becomes 6.
> thanks for any assistance,
> Rob



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