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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>,
	Martin KaFai Lau <kafai@fb.com>
Subject: [PATCH dwarves 0/2] generate BTF_KIND_TAG types from DW_TAG_LLVM_annotation dwarf tags
Date: Sun, 19 Sep 2021 17:35:45 -0700	[thread overview]
Message-ID: <20210920003545.3524231-1-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

Yonghong Song (2):
  dwarf_loader: parse dwarf tag DW_TAG_LLVM_annotation
  btf_encoder: generate BTF_KIND_TAG from llvm annotations

 btf_encoder.c  | 45 ++++++++++++++++++++++++++
 dwarf_loader.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++----
 dwarves.h      | 10 ++++++
 pahole.c       |  8 +++++
 4 files changed, 142 insertions(+), 6 deletions(-)

-- 
2.30.2


             reply	other threads:[~2021-09-20  0:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20  0:35 Yonghong Song [this message]
2021-09-20  0:35 ` [PATCH dwarves 1/2] dwarf_loader: parse dwarf tag DW_TAG_LLVM_annotation Yonghong Song
2021-09-21 21:57   ` Andrii Nakryiko
2021-09-20  0:35 ` [PATCH dwarves 2/2] btf_encoder: generate BTF_KIND_TAG from llvm annotations Yonghong Song
2021-09-21 22:02   ` Andrii Nakryiko
2021-09-22  1:16     ` Yonghong Song

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