[PATCH] D82367: [ObjectYAML][ELF] Add support for emitting the .debug_gnu_pubnames/pubtypes sections.

[Greg Clayton via Phabricator via llvm-commits]

clayborg added a comment.

In D82367#3135210 <https://reviews.llvm.org/D82367#3135210>, @dblaikie wrote:

> In D82367#3133152 <https://reviews.llvm.org/D82367#3133152>, @clayborg wrote:
>
>> In D82367#3133132 <https://reviews.llvm.org/D82367#3133132>, @dblaikie wrote:
>>
>>> In D82367#3133081 <https://reviews.llvm.org/D82367#3133081>, @clayborg wrote:
>>>
>>>> Is ".debug_gnu_pubtypes" different and/or better than the old ".debug_pubtypes" in terms of contents? AFAIK all debuggers completely ignore these sections as they don't contain all types (only public types). I did a quick web search for ".debug_gnu_pubtypes" and didn't find any docs or anything documenting this format.
>>>
>>> My general understanding is that GCC/GDB folks implemented .debug_gnu_pubnames(/types) because of the lack of guarantees in debug_pubnames(/types) - GCC does consume/rely on these sections (& gold can produce .gdb_index from these gnu_pub* sections - which is /necessary/ for correctness of gdb when using Split DWARF, in fact).
>>>
>>> I'm guessing like lots of stuff, it's probably basically defined by the agreement between GCC and GDB - and Clang/LLVM just tries to implement gnu_pub* to be as compatible as possible with that.
>>
>> Was there any documentation on this where the contents of this new format are detailed?
>
> Not that I know of.
>
>> Sounds promising and I would love to have LLDB to not have to manually index DWARF on all linux/android targets if at all possible.
>
> Presumably LLDB should probably be looking at the newer .debug_names format that's been standardized/documented, and derived from the apple names accelerator tables.

We have support already and we do look at that. Not many compilers enable DWARF5 at the moment, so we rarely see the .debug_names in any binaries, but LLDB is ready for these. It is hard to control and change the toolchains that people build with. My idea was to write a post processing tool that can add the .debug_names to binaries, like maybe llvm-objcopy or other tool.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D82367/new/

https://reviews.llvm.org/D82367