[PATCH] D96627: [llvm-jitlink] Implement JITLoaderGDB ObjectLinkingLayer plugin for ELF x86-64

Tue Feb 16 22:08:17 PST 2021

lhames added a subscriber: MaskRay.
lhames added a comment.

In D96627#2566871 <https://reviews.llvm.org/D96627#2566871>, @sgraenitz wrote:

>> If we constructed the debug object file from scratch (rather than mutating the existing one)
>
> While this sounds reasonable to me, it appears to add quite some effort. I guess we could grow our own writer that can emit in-memory ELF objects in some specific format, but there's a load of details that would need consideration sooner or later (recalculating offsets, compressed sections, etc.). Eventually, doing it right would probably mean something like `llvm-objcopy --only-keep-debug`. The implementation of it is buried with the tool implementation currently, so I can hardly "just use" it: https://reviews.llvm.org/rG5ad0103d8a04cb066dfae4fc20b0dfcd9413f4d4
>
> What do you think?
>
> (I will try a hack in the next days to see whether it's viable at all, but I'd would keep hopes low that we get there anytime soon.)

I think MachOWriter and ELFWriter seem very useful outside llvm-objcopy. @MaskRay -- Do you think it would be reasonable to move those classes into a library? Maybe Object? Or BinaryFormat?

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