Re: [Dwarf-Discuss] Segment selectors for the range list table.

[Robinson, Paul via Dwarf-Discuss]

> -----Original Message-----
> From: Dwarf-Discuss <dwarf-discuss-boun...@lists.dwarfstd.org> On Behalf
> Of Xing GUO via Dwarf-Discuss
> Sent: Tuesday, July 14, 2020 10:39 PM
> To: dwarf-discuss@lists.dwarfstd.org
> Subject: [Dwarf-Discuss] Segment selectors for the range list table.
> 
> Hi there,
> 
> The DWARFv5 spec mentioned that there might be segment selectors in
> the range list entries and when the segment_selector_size is 0, the
> segment selectors are omitted from the range list entries. However, it
> didn't mention how the segment selector should be encoded when the
> segment_selector_size isn't 0. Can anyone help me figure it out?
> Thanks a lot!

Hi Xing,

The segment selectors in the range list would be encoded the same way
as they would be in the main .debug_info section.  Range lists and
location lists are essentially extensions to .debug_info, for cases
where the range or location cannot be represented by simple DW_AT_* 
attribute values.

The specifics of encoding the segment selector would be whatever is
appropriate to the target.  DWARF does not specify these details.

Best Regards,
--paulr


> 
> 7.28 (page 243)
> The segment size is given by the segment_selector_size field of the
> header, and the address size is given by the address_size field of the
> header. If the segment_selector_size field in the header is zero, the
> segment selector is omitted from the range list entries.
> 
> --
> Cheers,
> Xing
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