Re: [Chicken-users] Segfault when trying to embed Scheme code (4.2.0)

[Jeronimo Pellegrini]

Hello,

I think I found what went wrong.

Two things that weren't clear to me are:

- The right way to create Scheme code callable from C is,
  first call CHICKEN_run (or CHICKEN_initialize). *And*
  the Scheme file needs to call "return-to-host" so the
  definitions there are actually used (is this correct?)

- define-external cannot be used for recursive definitions
  (probably supposed to be used only for wrappers -- is this
  correct?)
  My recursive define-external functions segfaulted; non-recursive
  ones didn't.

Did I get this right?

Thanks,
J.


On Mon, Oct 26, 2009 at 01:58:52PM -0200, Jeronimo Pellegrini wrote:
> Hi,
> 
> So -- I uninstalled my previous Chicken SVN version and installed 4.2.0;
> the problem still happens:
> 
> I was trying to compile the example in
> http://chicken.wiki.br/man/4/Embedding
> 
> (The example right below CHICKEN_yield)
> 
> So, I copied and pasted x.scm and y.c, and
> used the same command line:
> 
> $ csc x.scm y.c -embedded
> 
> Then tried to run it:
> 
> $ ./x
> data: 55d5ba68
> Segmentation fault
> 
> 
> This example also segfaulted:
> 
> a.c:
> 
> /-----------
> #include <chicken.h>
> #include <stdio.h>
> 
> extern threetimes (int);
> 
> int main() {
>     printf("See: %d\n", threetimes(2));
> }
> \-----------
> 
> a.scm:
> 
> /-----------
> (define-external (threetimes (int n)) int
>   (* n n n))
> \-----------
> 
> $ csc a.scm a.c -embedded -d2
> 
> $./a
> Segmentation fault
> 
> So... How do I debug those? I tried running the binary in gdb,
> but the only thing it told me was that the segfault was in
> the function "threetimes";
> 
> Is there something else I should have done? (I think I understood
> what was in the Wiki, but I could be wrong)
> 
> Thanks,
> J.
> 
> 
> 
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