Re: [RFC] Dont skip DW_TAG_member in load_partial_dies()

[Joel Brobecker <brobecker@adacore.com>]

Hello Daniel,

> > Just FYI: Here is the change we've made so far in gdb-6.3.
> > 
> >        if (abbrev->tag == DW_TAG_subprogram
> >           || abbrev->tag == DW_TAG_variable
> >           || abbrev->tag == DW_TAG_namespace
> > +          || abbrev->tag == DW_TAG_enumeration_type
> > +          || abbrev->tag == DW_TAG_structure_type
> 
> That's a very different problem - you're at the other interesting if in
> this function.  Please show me an example of debug information which
> requires this - and see the comment above which talks about why most of
> these checks are only for buggy compilers...

It's a long story :).

In Ada, we allow nested functions. In order to be able to break inside
a nested function, using "break nested_function", we need to scan the
DIEs inside subprogram DIEs and build partial symbols for them. That's
the first local change we did. Something like: if ada and then
subprogram, then do not skip to sibling.

And next, we face something a bit out of the ordinary: We had a function
that was inlined. That caused GCC to create a nameless subprogram DIE,
with an AT_specification attribute pointing to the original procedure.
The tricky part was that there was inside that procedure a nameless
enumeration DIE that also had an AT_specification. We failed on that
second AT_specification during the lookup in the hash-table.

I hope this makes sense. I'm trying to be short as I'm busier than
I have ever been right now. Don't hesitate to let me know if I'm not,
though.  It may take a bit of time for me to answer, but I will answer.

-- 
Joel