Steel Bank Common Lisp

On Sun, 14 Nov 2004, John Morrison wrote:

> (1) Pointers to ints and other things work fine, but sb-alien chokes
> on pointers to enums.  (Somewhat confusingly, it seems to think this
> is an attempt to redefine the enumeration.)  Is this a bug or a
> feature?
>
> (2) If there is only one enum value (unfortunately this is terribly
> common in my code-to-be-bound), then sb-alien dies on a divide by zero
> error.  Is this a bug or a feature?

To avoid misunderstandings, test-cases would be good. Given such, I'll try 
to look into these over the next week -- both _sound_ like bugs to me.

Cheers,

  -- Nikodemus              Schemer: "Buddha is small, clean, and serious."
                   Lispnik: "Buddha is big, has hairy armpits, and laughs."

Hi;

On Sunday 14 November 2004 02:20 pm, Nikodemus Siivola wrote:
> To avoid misunderstandings, test-cases would be good. Given such, I'll try

Sorry -- and thanks for your ever-so diplomatic phrasing.  I am in
meetings for the next two days (agh), but I shall assemble a
stand-alone test for reproducing this.  As some sb-alien things (like
the define-alien-routine) cannot be loaded without loading the foreign
library (else one will get a runtime "cannot find that foreign symbol"
error), I will need to package up a dynamic object file, too.

I am doing this on Linux (as all this is SO machine-dependent), using
FC2-vintage kernel and compiler.  Is a Linux box (not necessarily FC2)
available to you, so that I can deliver you a tgz so that you can
rebuild and reproduce the problem with (what I sincerely hope to be) a
minimum of fuss?

> to look into these over the next week -- both _sound_ like bugs to me.

Thanks, and apologies again for the complaint without verifiable
substance.

-jm

>
> Cheers,
>
>   -- Nikodemus              Schemer: "Buddha is small, clean, and serious."
>                    Lispnik: "Buddha is big, has hairy armpits, and laughs."

-- 
==== John Morrison
==== MAK Technologies Inc.
==== 10 Fawcett Street, Cambridge, MA 02138
==== http://www.mak.com/
==== vox:617-876-8085 x115
==== fax:617-876-9208
==== jm@...

On Mon, 15 Nov 2004, John Morrison wrote:

> meetings for the next two days (agh), but I shall assemble a
> stand-alone test for reproducing this.  As some sb-alien things (like
> the define-alien-routine) cannot be loaded without loading the foreign
> library (else one will get a runtime "cannot find that foreign symbol"
> error), I will need to package up a dynamic object file, too.
>
> I am doing this on Linux (as all this is SO machine-dependent), using
> FC2-vintage kernel and compiler.  Is a Linux box (not necessarily FC2)
> available to you, so that I can deliver you a tgz so that you can
> rebuild and reproduce the problem with (what I sincerely hope to be) a

Yes, I'm running Debian testing on an x86, so that should not be a 
problem.

You _may_ be able to reproduce the problem without a .so too, if the 
reproduction doesn't require actually calling or accessing aliens: SBCL 
has no way to verify the types of alien variables or routines, so things 
like

  (define-alien-routine printf c-string (foo (* t)))

can be used for tickling bugs.

Cheers,

  -- Nikodemus              Schemer: "Buddha is small, clean, and serious."
                   Lispnik: "Buddha is big, has hairy armpits, and laughs."