[Dwarf-Discuss] Help with debug info for fixed-point data types

[Rohit Arul Raj]

Hi Ron,

>From the debug information generated, i need to differentiate between
different fixed point types that have same size.
For e.g. the following data types long fract (S.39) and accum (S7.31)
have same size (8 bytes).

Is there any way to find out from the debug information which type it
is if their sizes are same?

>From the manual, i assumed that DW_AT_binary_scale ,DW_AT_digit_count
can be used for this purpose. But i was not sure how to encode this
information.

Can you suggest any way to overcome this issue?

Regards,
Shafi

On Nov 6, 2007 6:44 PM, Ron Brender <ron.brender at charter.net> wrote:
> Shafi,
>
> I don't understand--is there a question here? What do you need help with?
>
> I assume you have the DWARF V3 Standard of December 2005, right?
> If there is a question about how to interpret the DWARF standard, this
> list can help. If there is a question about patches to support fixed
> point in gdb, this list is not a good resource.
>
> Ron
>
> p.s. For binary fixed point I would not expect you to need
> DW_AT_digit_count at all. That is only relevant for numeric string and
> packed decimal types.
>
> ---------------------
>
> Rohit Arul Raj wrote:
> > Hello all,
> >
> > I have implemented fixed point data types in gcc-4.1.1 by
> > incorporating the patches sent out in the gcc patches mailing list. To
> > debug fixed-point types, as per the dwarf manual we may need the
> > following info as follows.
> > DW_AT_binary_scale : binary scale factor for fixed-point type.
> > DW_AT_digit_count : digit count for packed decimal or numeric string type.
> >
> > For a fixed point data type of format s7.15 how to encode the
> > information for the format into the following information
> >
> > Format : s7.15
> > DW_AT_binary_scale :
> > DW_AT_digit_count :
> >
> >
> > Format : s.31
> > DW_AT_binary_scale :
> > DW_AT_digit_count :
> >
> >
> > Any help would be appreciated.
> >
> > Regards,
> > Shafi
>
>
>