The issue here is that the selector count seems to be defined with
two types, one returning an object and the other returning an
integer. The compiler thinks it's the first one, and is the second
one. It gets an integer return, but treats it as an object. The
return value is 3, which is equivalent to the SmallInt value. If you
try this with an array of four elements, then you will get a crash
instead.
The offending -count method seems to be in GSMemoryPanelEntry - I
have absolutely no idea what this class is supposed to do. It is
incredibly bad form to define selectors with the same name but
different types to others in the system (sometimes unavoidable with
independently-developed libraries, but it certainly should not be
happening with selectors declared in OpenStep classes) - you can turn
on a GCC warning to do this, but it seems the GNUstep devs didn't,
which is a shame since it can cause some very difficult to track down
bugs in ObjC code too.
I'm not sure what the best solution is here. I don't want to have to
move the auto-boxing logic into runtime code, since this will come
with a huge performance penalty, but it might be unavoidable.
Suggestions?
David
On 31 Jul 2008, at 08:43, Yen-Ju Chen wrote:
> I might miss something, but it seems that -count does not work
> properly in Smalltalk.
> Here is a short script for testing.
>
> NSObject subclass: SmalltalkTool
> [
> run
> [
> |a|
> a := {'1'. '2'. '3'.}.
> a log.
> a count log.
> ]
> ]
>
> 'a count' return 1, but a is an array of 3 objects.
>
> Thanx.
>
> Yen-Ju
>
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> Etoile-dev mailing list
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