[PATCH] D94670: [DebugInfo][NFC] add a new DIE type to represent label + offset

Fri Jan 15 12:10:24 PST 2021

hubert.reinterpretcast added a comment.

In D94670#2501886 <https://reviews.llvm.org/D94670#2501886>, @MaskRay wrote:

> So how does your example work?

It doesn't.

>   .section        .debug_info

That has to be

  .dwsect 0x10000

>> On aix, the default c/c++ compiler is XLC. With that compiler, there is no assembly mode. XLC only has object mode, so it does not involve assembler to generate a object file.
>
> To be clear, you said XLC does not support assembly mode, but you'll implement something in `llvm/lib/MC`, then can this limitation be removed?

I'm not sure where your question is coming from. All released versions of XL C/C++, including the version with Clang front-end components, uses an IBM proprietary code generating back-end that is not based on LLVM.

> powerpc64-ibm-aix gas supports this:
>
>   .long .Ldebug_info_end0 - .Ldebug_info_start0
>   .Ldebug_info_start0:
>   .short 4
>   .Ldebug_info_end0:

Can you elaborate on how that snippet would end up placing the data in the appropriate XCOFF section?

Repository:
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  https://reviews.llvm.org/D94670/new/

https://reviews.llvm.org/D94670