[llvm-dev] RFC: Add DWARF support for yaml2obj

[Xing GUO via llvm-dev]

On 5/21/20, Adrian Prantl <aprantl at apple.com> wrote:
> I think the example looks like it would be really useful for many categories
> of testcases!
> Will it still be possible to manually specify the .debug_abbrev section when
> this is desired after you are done?

Yes, I think it works. There are two ways to edit the .debug_abbrev section.

i) Edit the "Attr:" and "Form:" entries of a DIE in the ".debug_info"
section. This controls the generation of the ".debug_abbrev" section
at a high level since "yaml2obj" generates the ".debug_abbrev" section
according to the contents from debug information entries.

ii) Edit the ".debug_abbrev" directly. This controls the generation of
the ".debug_abbrev" section at a low level. We will have to hardcode
the tag and attributes for each DIE. Editing the section in this way
doesn't need a "debug_info" entry in the "DWARF".

Additionally, if we have the "debug_info" entry and the "debug_abbrev"
entry at the same time, the latter one will overwrite the tags and
attributes generated by the former one.

Does it make sense?

-- 
Cheers,
Xing