On Sun, Sep 19, 2021 at 5:36 PM Yonghong Song [off-list ref] wrote:

Parse dwarf tag DW_TAG_LLVM_annotation. Only record
annotations with btf_tag name which corresponds to
btf_tag attributes in C code. Such information will
be used later by btf_encoder for BTF conversion.

LLVM implementation only supports btf_tag annotations
on struct/union, func, func parameter and variable ([1]).
So we only check existence of corresponding DW tags
in these places. A flag "--skip_encoding_btf_tag"
is introduced if for whatever reason this feature
needs to be disabled.

 [1] https://reviews.llvm.org/D106614

Signed-off-by: Yonghong Song <redacted>
---

LGTM.

Acked-by: Andrii Nakryiko <andrii@kernel.org>

 dwarf_loader.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++----
 dwarves.h      | 10 ++++++
 pahole.c       |  8 +++++
 3 files changed, 97 insertions(+), 6 deletions(-)

[...]