[Bug gdb/23504] index cache: Produce and consume DWARF5 format

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23504

--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Tom Tromey from comment #4)
> The context here is GDB generating an index and putting it into the index
> cache.  .debug_names refers to symbol names using their index in .debug_str,
> so if a string does not appear there, then how would GDB cope?
> Currently I think it writes out a new .debug_str section, but of course
> (see the other PR), what's currently done is wrong; and also this seemed
> weird for the index cache, because in that scenario nobody is rewriting
> the original object file.
> 
> Not sure if this is clear or not...

It is clear, I just don't know enough about the index cache to understand which
design makes most sense. It seems for strings you need some way to tell which
section they came from, either .debug_string (the default), .debug_info (for
DW_FORM_string, if the index already associates a DIE offset with that, maybe
just have a flag that it looks up the DW_AT_name there?) and .debug_line_str
(DW_FORM_line_str) for those symbols which have a name that also represents a
file/path (dunno how to easily represent that). And then there are the
DW_FORM_strp_sup/DW_FORM_GNU_strp_alt strings (then the .debug_strp is in
another file...).

I think the summary is that DWARF5 got a lot of ways to store a string :)

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