llvm dev - Apr 2021 - Support of Big archive (AIX archive)

Hello,
I implement support of AIX archive (big archive / XCOFF) on LLVM.
I have done a prototype available here :
https://github.com/EGuesnet/llvm-project/commit/1db5ddbdfea5614d0b91a8a6a1920ac630163ec0
.
This prototype replaces support of GNU/BSD/... archive by big archive, but you
can switch changing the include. I have implemented only read operation (t, x,
p).

I want advices, especially to merge correctly support of Big archive and other
archive. Main troubles to merge is big archive has a different header than other
archive.
Moreover, big archives have a fix length header, and one header for each object;
fix and object headers are different (they are the same structure for non-big
archive). Big archives have member table and symbol table at the end of the
archive, so you must stop to read it before the end; the location of these table
are given with absolute offset, hard to take into account in current code.

Big archive documentation is here :
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/filesreference/ar_big.html
.

Thanks.
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+Fangrui Song +James Henderson +Jordan Rupprecht

Can't say I know too much about the architecture here, but perhaps
these folks have some ideas.

On Thu, Apr 1, 2021 at 1:02 AM GUESNET, ETIENNE via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Hello,
>
> I implement support of AIX archive (big archive / XCOFF) on LLVM.
>
> I have done a prototype available here :
https://github.com/EGuesnet/llvm-project/commit/1db5ddbdfea5614d0b91a8a6a1920ac630163ec0
.
>
> This prototype replaces support of GNU/BSD/... archive by big archive, but
you can switch changing the include. I have implemented only read operation (t,
x, p).
>
>
>
> I want advices, especially to merge correctly support of Big archive and
other archive. Main troubles to merge is big archive has a different header than
other archive.
>
> Moreover, big archives have a fix length header, and one header for each
object; fix and object headers are different (they are the same structure for
non-big archive). Big archives have member table and symbol table at the end of
the archive, so you must stop to read it before the end; the location of these
table are given with absolute offset, hard to take into account in current code.
>
>
>
> Big archive documentation is here :
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/filesreference/ar_big.html
.
>
>
>
> Thanks.
>
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