RFC: fix bug when debugging prelink'd library

[Jan Kratochvil]

On Mon, 12 Jul 2010 23:06:21 +0200, Tom Tromey wrote:
> >>>>> "Tom" == Tom Tromey <tromey@redhat.com> writes:
> 
> Tom> It does mean we need 3 new accessors, which is ugly.  OTOH, I found
> Tom> that we use the objfile's name in locexpr_describe_location_piece,
> Tom> and there I think we also want the master objfile.
> 
> We only need 1 new accessor -- using the master objfile is ok for the
> other uses.

Yes, I like the patch this way.


Thanks,
Jan



> --- a/gdb/dwarf2loc.h
> +++ b/gdb/dwarf2loc.h
> -/* Return the OBJFILE associated with the compilation unit CU.  */
> +/* Return the OBJFILE associated with the compilation unit CU.  If CU
> +   came from a separate debuginfo file, then the master objfile is
> +   returned.  */
>  struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu);

The same comment needs to be updated at the function definition in
dwarf2read.c.


> +/* Return the text offset for CU.  */
> +CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu);
+
> +/* Return the text offset of the CU.  */

Suggesting to extend the comment:

This returned offset is specific to this CU's debug info objfile and it may
be different from the SEPARATE_DEBUG_OBJFILE_BACKLINK objfile offsets.


> +CORE_ADDR
> +dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
> +{
> +  struct objfile *objfile = per_cu->psymtab->objfile;
> +
> +  return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
> +}