[armedbear-devel] expecting to find integer on stack

Alan Ruttenberg alanruttenberg at gmail.com
Tue Apr 27 06:54:45 UTC 2010

On Tue, Apr 27, 2010 at 2:48 AM, Alessio Stalla <alessiostalla at gmail.com> wrote:
> On Tue, Apr 27, 2010 at 8:24 AM, Mark Evenson <evenson at panix.com> wrote:
>> On 4/27/10 4:05 AM, Alan Ruttenberg wrote:
>> […]
>>> Now I'm getting used to the new pathname code and other changes.
>>> 1) I used to use probe-file to test whether a thing was a file. Now,
>>> however, probe-file on an http URI will return true. Is there a
>>> recommended way to see whether a pathname is a file pathname?
>> URL-PATHNAME and JAR-PATHNAME are now subtypes of PATHNAME, so the usual
>> CL type machinery should be at your disposal.  For convenience, we have
>> defined predicate functions EXT:PATHNAME-URL-P and EXT:PATHNAME-JAR-P
>> which is what I would expect one for common usage.
>>> 2) I use a different classloader (from bsh) so as to be able to add
>>> jars to my classpath dynamically. However, if I wanted to specialize a
>>> method on a java class so obtained, I need to coerce it to one that
>>> clos knows about. I was using an internal call to do so:
>>> (#"findJavaClass" 'org.armedbear.lisp.JavaClass class)
>>> However this is gone in the new version. Could you suggest how I can
>>> register a java class that I've obtained from the alternative class
>>> manager so that clos knows about it?
>> Hmmm, this should be unrelated to the URL pathname implementation.
>> JavaObject.java seems to still have a findJavaClass() method, and even
>> provides a Lisp interface JAVA::%FIND-JAVA-CLASS.  Maybe JSS is failing
>> to properly invoke the method?
>> In any case, we should figure out what functionality you need here, and
>> polish this up as a semi-supported interface Lisp-side for usage.  The
>> first step is figuring out where (and then why) we changed this.
> IIRC, I should have a local patch to make JCLASS use another
> classloader if you pass it to it, including in CLOS method
> specializers, as in (defmethod foo ((x (jclass "foo"
> *my-classloader*))) ...)
>  If that sounds sensible to you, I can adapt it to the current version
> of abcl and commit it, so it can be tested.

Let's give it a shot.

> Ciao,
> Alessio
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