Add AIX support in gimli symbolizer

[ecnelises]

Do we need to upgrade object to 0.31.0 and enable xcoff feature? (there's one upgrading it #522 )

[workingjubilee]

That's weird. More of the tests should be not-failing at this point. Can you rebase this on master? The object bump is merged, for note.

[bzEq]

Rebased and fixed build failures.

[workingjubilee]

Also I realized my initial review includes a lot of specific questions about segments in the code and what the supporting concepts are for explaining them, but you don't need to address all of those questions in such a point-by-point manner if you want to take a more high-level approach to documenting (or pointing to existing documentation of) the concepts in question.

[bzEq]

you don't need to address all of those questions in such a point-by-point manner if you want to take a more high-level approach to documenting (or pointing to existing documentation of) the concepts in question.

I'll try my best to give an overview of AIX ABI. Since the latest AIX ABI is not formally documented, its behaviors largely depend on assembler manual and current implementation of IBM OpenXL/XL.

[workingjubilee]

Ah, I had a feeling it might be something like that. That unfortunately motivates my questions more, since we can't easily look up things and instead have to piece together answers from the scraps we can dig up. But I'm somewhat familiar with typical Power ISA assembly, at least, so this assembler manual is very helpful.

[bzEq]

Gentle ping.

[workingjubilee]

Also feel free to squash/rebase this with your next pass of changes to however the commit history should look.

[bzEq]

Addressed comment and rebased. Thanks @workingjubilee for great suggestions on coding style.

[github-actions[bot]]

Below is the size of a hello-world Rust program linked with libstd with backtrace.

Original binary size: 533920B Updated binary size: 530744B Difference: -3176B (-0.59%)

[bzEq]

Gentle ping.

[workingjubilee]

Excellent, thank you!