From: Yonghong Song <yhs@fb.com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
<dwarves@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>, <bpf@vger.kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>
Subject: [PATCH dwarves v2 0/2] generate BTF_KIND_TAG types from DW_TAG_LLVM_annotation dwarf tags
Date: Tue, 21 Sep 2021 19:13:21 -0700 [thread overview]
Message-ID: <20210922021321.2286360-1-yhs@fb.com> (raw)
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
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
next reply other threads:[~2021-09-22 2:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-22 2:13 Yonghong Song [this message]
2021-09-22 2:13 ` [PATCH dwarves v2 1/2] dwarf_loader: parse dwarf tag DW_TAG_LLVM_annotation Yonghong Song
2021-09-22 2:13 ` [PATCH dwarves v2 2/2] btf_encoder: generate BTF_KIND_TAG from llvm annotations Yonghong Song
2021-09-27 20:40 ` [PATCH dwarves v2 0/2] generate BTF_KIND_TAG types from DW_TAG_LLVM_annotation dwarf tags Arnaldo Carvalho de Melo
2021-09-27 20:59 ` Arnaldo Carvalho de Melo
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