ObjectViewer Bug in Squeak 2.x ?
Bob Arning
arning at charm.net
Tue Aug 10 00:34:42 UTC 1999
On Mon, 9 Aug 1999 16:06:30 -0400 Dean_Swan at Mitel.COM wrote:
>Evaluating the following expression with "do it..." on any Squeak V2.x system
>I've tried causes the system to lock up to the point that the Squeak VM needs to
>be killed from the host OS. Evaluating the same expression in Squeak V1.3 works
>fine and operates as expected. (BTW, this is the example from the Class Comment
>for ObjectViewer). Some kind of "dieing gasp" message comes up that indicates
>something about a message not in the inheritance chain, but since the system
>locks up, debugging this is a bit difficult.
>
>
> Sensor evaluate: [Sensor cursorPoint printString displayAt: 0 at 0]
> wheneverChangeIn: [Sensor cursorPoint].
Dean,
I suspect that there has been a recent change that has broken the ObjectViewer, but if you file in the code below, your example works.
Cheers,
Bob
======================================
'From Squeak 2.3 of January 14, 1999 on 9 August 1999 at 8:29:34 pm'!
!Message methodsFor: 'sending' stamp: 'RAA 8/9/1999 20:29'!
sentToExactly: receiver
"answer the result of sending this message to receiver"
^ receiver perform: selector withArguments: args! !
!ObjectViewer methodsFor: 'very few messages' stamp: 'RAA 8/9/1999 20:29'!
doesNotUnderstand: aMessage
"Check for change after sending aMessage"
| returnValue newValue |
recursionFlag ifTrue: [^ aMessage sentToExactly: tracedObject].
recursionFlag _ true.
returnValue _ aMessage sentToExactly: tracedObject.
newValue _ valueBlock value.
newValue = lastValue ifFalse:
[changeBlock value.
lastValue _ newValue].
recursionFlag _ false.
^ returnValue! !
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