[RFA] New dwarf2_attribute_true_p function in dwarf2read.c

[Joel Brobecker]

> > 2004-04-15  Joel Brobecker  <brobecker@gnat.com>
> > 
> >         * dwarf2read.c (dwarf2_attribute_true_p): New function.
> >         (die_is_declaration): Use the function above.
> > 
> > Tested on x86-linux, no regression.
> > 
> > OK to apply?
> 
> Sorry, this patch is incorrect.

Ah, sorry, you're right, I wasn't paying enough attention.
I have backed the change out for the time being, pending rework.

> > -  return (dwarf2_attr (die, DW_AT_declaration, cu)
> > -	  && ! dwarf2_attr (die, DW_AT_specification, cu));
> > +  /* A DIE is a declaration if it has a DW_AT_declaration attribute
> > +     which value is non-zero.  However, we have to be careful of DIEs
> > +     with a DW_AT_specification attribute, because dwarf2_attribute_p()
> > +     follows this attribute, and therefore might cause us to find a
> > +     DW_AT_declaration attribute, but that belongs to a different DIE.  */
> > +  return (dwarf2_attribute_true_p (die, DW_AT_declaration, cu)
> > +	  && ! dwarf2_attribute_true_p (die, DW_AT_specification, cu));
> >  }
> >  
> >  /* Return the die giving the specification for DIE, if there is
> 
> First of all, there's no dwarf2_attribute_p, you mean dwarf2_attr and
> dwarf2_attr_true_p.
> 
> Secondly, the predicate function should be used for flag attributes
> like DW_AT_declaration, but checking DW_UNSND for DW_AT_specification
> is incorrect - it's a DIE reference.  dwarf2_attr != NULL is the right
> check.  Some day I hope to add checking macros to verify we're using
> the right member of each union...

I will send a new patch right away.

Thanks Daniel.
-- 
Joel