Re: [PATCH] Objective-C language support.

[Jim Blandy <jimb at redhat dot com>]

Can we have a more extensive comment here?  What are symbols that
begin with ".objc_"?  Why should we ignore them?  Where can we find
more complete documentation for what they mean?  (Is there any
document that describes how Objective C programs are represented at
the assembly/linkage level?)

Michael Snyder <msnyder@redhat.com> writes:

> Adam Fedor wrote:
> > 
> > This patch adds Objective-C language support to gdb based upon a patch
> > provided by Apple Computer Inc from their version of gdb. Note that the
> > patch only contains changes to existing files. New files (objc-lang.h,
> > objc-lang.c, objc-exp.y) and a gdb.objc testsuite directory are located at
> > 
> > ftp://ftp.gnustep.org/pub/gnustep/contrib/gdb-objc-patch.tar.gz
> > 
> 
> Jim, could you take a quick look at this small change?
> [Adam, the comment needs a period followed by two spaces.]  
> 
> 
> >         * elfread.c (elf_symtab_read): Skip ObjC symbols.
> 
> > Index: gdb/elfread.c
> > ===================================================================
> > RCS file: /cvs/src/src/gdb/elfread.c,v
> > retrieving revision 1.23
> > diff -u -p -r1.23 elfread.c
> > --- gdb/elfread.c       24 Jul 2002 23:51:35 -0000      1.23
> > +++ gdb/elfread.c       17 Sep 2002 19:29:59 -0000
> > @@ -349,7 +349,12 @@ elf_symtab_read (struct objfile *objfile
> >                 }
> >               else if (sym->section->flags & SEC_CODE)
> >                 {
> > -                 if (sym->flags & BSF_GLOBAL)
> > +                 if (sym->name[0] == '.' && (strncmp (sym->name + 1, "objc_", 4) == 0))
> > +                   {
> > +                     /* Looks like an Objective-C special symbol */
> > +                     continue;
> > +                   }
> > +                 else if (sym->flags & BSF_GLOBAL)
> >                     {
> >                       ms_type = mst_text;
> >                     }