Re: Dynamic loading progress

[Stefan Monnier]

> It should work but I've ran into a strange problem: the doc field is
> set correctly in step a) but the field becomes either an invalid lisp
> object or garbage at step b).
[...]
> It suspect it has to do with garbage collecting since I have not done
> anything special to protect the doc field. I'm not sure how to
> proceed.

Right.  You need to tell the GC to trace this new field.

Look at the mark_object function in alloc.c.

You could change its handling of PVEC_SUBR such that it calls itself
recursively on the `doc' field and then make sure the VECTOR_MARKED_P bit
gets reset to false in gc_sweep.

Or maybe force those `doc' references to be kept alive by adding
globally reachable references to them (e.g. have a global list of all
the cons cells you ever added to such a `doc' field, and then
`staticpro' that list).


        Stefan