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Re: [RFA/RFC] New command: ``start''
On Thu, May 20, 2004 at 09:02:59AM -0700, Joel Brobecker wrote:
> Here is how we find the name of the main procedure: We lookup a certain
> symbol which is created by our binder, __gnat_ada_main_program_name.
> This symbol points to a string holding the name of the main procedure.
> You'll find the code in ada-lang.c:begin_command().
OK. So this has the property that I was hoping for; it won't return a
false positive for a non-Ada main program.
> > I think the best approach may be to iterate over the languages
> > included in the object file, asking each of them whether this language
> > appears to contain a main procedure. Or even to simply skip the
> > langhook complexity and just call an Ada find-main function! For gcj
> > I suspect we will just change the debug information.
>
> I thought about several approaches along the same idea. One of them
> was to implement a sniffing mechanism, with certain sniffers having
> certain priorities. But you know, I really like the idea of dropping
> the langhook, and just call the ada function. Something like this:
>
> char *
> main_name ()
> {
> /* If we found the name of main from the debug info, or
> already looked it up, then return the name of main. */
> if (name_of_main != NULL)
> return name_of_main;
>
> /* Is the main in Ada? */
> tmp_main_name = ada_find_main_name ();
> if (tmp_main_name != NULL)
> {
> set_main_name (tmp_main_name);
> return name_of_main;
> }
>
> /* Is the main in Java? */
> tmp_main_name = java_find_main_name ();
> [etc...]
>
> /* Fallback: main_name must be the usual "main". */
> set_main_name ("main);
> return name_of_main;
> }
>
> The only drawback I see from this is that I will need to include
> ada-lang.h. It would have been nice to avoid this, which is possible
> with the langhooks. I could also add the ada_find_main_name()
> declaration in another more common .h file, but that would be a dirty
> trick, IMO.
This is fine with me. Let's see if anyone else objects to it.
Since I don't know of any language other than Ada that will have a
fallback for this, I don't think it's worth inventing a lot of
machinery for it. I'm not especially interested in allowing a language
to be compiled out, either.
--
Daniel Jacobowitz