[rfa] Dwarf2 testsuite

[Michael Snyder]

Daniel Jacobowitz wrote:
> This patch adds a sample test for DWARF-2 unit testing.  It requires:
>   - gas, for the .uleb128/.sleb128 directives among other things
>   - ELF; it could probably be made to work on non-ELF dwarf2 systems
>     but I don't know what changes would be necessary.  Perhaps those
>     should be tested separately.
> 
> I haven't tried, but I wrote it with the intent that it would not care about
> the host beyond that; it should run on 64-bit ELF targets OK.
> 
> It just includes a trivial test containing hand-written DIEs for a single
> CU.  This one file I annotated exhaustively, and let me tell you, it was
> exhausting; for future tests I will allow them to be self-documenting (the
> comments don't say anything that compiling the file and running readelf
> won't tell you).
> 
> The test itself just demonstrates that the dwarf2 reader isn't completely
> busted.  But more interesting tests could be easily added.
> 
> Look OK?  Suggestions?
> 

Looks exhausting.  I'm glad you're doing this.

Dan, what would you think about (somebody) writing a tool
that could read some sort of description (eg. what's in
your comments), and generate the dwarf2 recs?  Sort of a
simple compiler that accepts, in effect, the dwarf2 spec
as input?  Would that be, perhaps, less of an effort than
writing a sufficiently large subset of tests by hand?