[PATCH] D53261: [BPF] Add BTF generation for BPF target

[Yonghong Song via Phabricator via llvm-commits]

yonghong-song added a comment.

I just added some more commit messages to make it clear. The below is
what happens when "-target bpf -g" is specified:

  . both dwarf and BTF sections will be generated.
  . We still need dwarf for llvm-objdump or any other
    user space tools which inspect dwarf, which may
    help debug/inspect the BPF byte codes.
  . BTF sections are consumed by kernel BTF loader
    and kernel itself.
  . When the BPF object files are ready to deploy to
    different machines for kernel loading/execution,
    all dwarf sections can be stripped as they will
    not be used any more.

I briefly looked at the parsing directly from IR
to BTF. The CodeView provides a good example
and it is certainly possible. But since we need
to generate dwarf anyway, dwarf2BTF seems
more compelling?


Repository:
  rL LLVM

https://reviews.llvm.org/D53261