[squeak-dev] Re: Bug with valueWithReceiver:arguments:
Klaus D. Witzel
klaus.witzel at cobss.com
Sun Nov 23 18:39:24 UTC 2008
On Sun, 23 Nov 2008 17:51:42 +0100, Antoine Marot wrote:
>>> Does anyone know approximately when this fix should be added to an
>>> official release ? This bug seriously makes it hard for me to share my
Further to the below I checked http://bugs.squeak.org and there was not
report? I think you (or Frederic) have to report the bug before it
officially is one ...
>> I understand that what you need is "... method
>> valueWithReceiver:arguments: is used hugely with method wrappers" and
>> you need it without VM bug when a primitive fails.
>> Perhaps a stupid question (I don't know any other your requirements)
>> but instead of wrapping methods one could easily #perform: a selector
>> on the receiver. What would be the reason that you depend on
>> #valueWithReceiver:arguments: ? it cannot be performance since
>> #perform: needs some time as well.
> The goal of my wrappers is to choose (depending on the context) between
> the original method and an instrumented one.
> The calling code is similar to this :
> withArgs: args
> ifTrue: [transformedMethod]
> ifFalse: [originalMethod] )
> Note that I don't use #valueWithReceiver:, but the bug also appears with
> that method.
> Since #perform: goes through the method lookup process, it will loop
> unless I use two new selectors. This solution has several disadvantages
> like implying a second lookup process or not being invisible (the new
> method dictionary entries appear in browsers and are editable which is
Okay, understood (I think so ;) Perhaps there is a workaround (namely: the
Smalltalk simulator) for Squeak, which you can give a try:
The debugger apparently knows how to perform a primitive by number, look
at #tryPrimitive:withArgs: its implementor and sender.
If you do that and it returns (ContextPart primitiveFailToken) then do the
"primitiveFailed" part, using #withArgs:executeMethod: as above *but* on a
*clone* of the originalMethod into which you put primitive number 0
(repeat: the clone!).
"If at first, the idea is not absurd, then there is no hope for it".
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