Re: Dynamic loading progress; funcall of goto-char fails

[Stephen Leake]

Stephen Leake <address@hidden> writes:

> Aurélien Aptel <address@hidden> writes:
>
>> I've tried to implement modules using Daniel's plan. It turned out to
>> be pretty easy, mostly because I'm more familiar with the Emacs
>> codebase now and because it's a lot less intrusive than my previous
>> attempt.
>>
>> It's not finished but I have a basic module working on linux. It's a
>> proof of concept, basically.
>
> I've implemented a test module that calls two Ada mode parser actions
> (see below).
>
> The real module will call the actual parser and build the action args
> from the parse results.
>
> I did not have to modify anything in the Emacs C code to make this work,
> so it shows this module design is adquate for my use case so far.

I've made more progress; I've got a module that should run the full Ada
parser on a buffer.

However, when I run it, it crashes on a call like:

emacs_value goto_char_sym = env.intern (env, "goto-char");
env.funcall (env, goto_char_sym, env.make_fixnum (env, 1));

When I trace the 'funcall' (in eval.c DEFUN funcall), it hits this code:

  fun = original_fun;
  if (SYMBOLP (fun) && !NILP (fun)
      && (fun = XSYMBOL (fun)->function, SYMBOLP (fun)))
    fun = indirect_function (fun);

and sets fun to 0, which then signals a failure.

Is this because 'goto-char' is implemented in C?

If so, I need a way to call elisp functions implemented in C.

Hmm. I guess for now I can provide elisp wrappers for all the functions
I need.

-- 
-- Stephe