Re: [PATCH dwarves v2 0/2] generate BTF_KIND_TAG types from DW_TAG_LLVM_annotation dwarf tags

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Tue, Sep 21, 2021 at 07:13:21PM -0700, Yonghong Song escreveu:
> LLVM has implemented btf_tag attribute ([1]) which intended
> to provide a "string" tag for struct/union or its member, var,
> a func or its parameter. Such a "string" tag will be encoded
> in dwarf. For non-BPF target like x86_64, pahole needs to
> convert those dwarf btf_tag annotations to BTF so kernel
> can utilize these "string" tags for bpf program verification, etc.
>         
> Patch 1 enhanced dwarf_loader to encode DW_TAG_LLVM_annotation
> tags into internal data structure and Patch 2 will encode
> such information to BTF with BTF_KIND_TAGs.
> 
>  [1] https://reviews.llvm.org/D106614

Applied both locally, now building HEAD llvm/clang to test everything,

- Arnaldo
 
> Changelog:
>   v1 -> v2:
>     - handle returning error cases for btf_encoder__add_tag().
> 
> Yonghong Song (2):
>   dwarf_loader: parse dwarf tag DW_TAG_LLVM_annotation
>   btf_encoder: generate BTF_KIND_TAG from llvm annotations
> 
>  btf_encoder.c  | 63 ++++++++++++++++++++++++++++++++++++-
>  dwarf_loader.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++----
>  dwarves.h      | 10 ++++++
>  pahole.c       |  8 +++++
>  4 files changed, 159 insertions(+), 7 deletions(-)
> 
> -- 
> 2.30.2

-- 

- Arnaldo