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 0/4] btf: support btf_type_tag attribute
Date: Mon, 22 Nov 2021 20:56:12 -0800 [thread overview]
Message-ID: <20211123045612.1387544-1-yhs@fb.com> (raw)
btf_type_tag is a new llvm type attribute which is used similar
to kernel __user/__rcu attributes. The format of btf_type_tag looks like
__attribute__((btf_type_tag("tag1")))
For the case where the attribute applied to a pointee like
#define __tag1 __attribute__((btf_type_tag("tag1")))
#define __tag2 __attribute__((btf_type_tag("tag2")))
int __tag1 * __tag1 __tag2 *g;
the information will be encoded in dwarf.
In BTF, the attribute is encoded as a new kind
BTF_KIND_TYPE_TAG and latest bpf-next supports it.
The patch added support in pahole, specifically
converts llvm dwarf btf_type_tag attributes to
BTF types. Please see individual patches for details.
Changelog:
v1 -> v2:
- reorg an if condition to reduce nesting level.
- add more comments to explain how to chain type tag types.
Yonghong Song (4):
libbpf: sync with latest libbpf repo
dutil: move DW_TAG_LLVM_annotation definition to dutil.h
dwarf_loader: support btf_type_tag attribute
btf_encoder: support btf_type_tag attribute
btf_encoder.c | 7 +++
dutil.h | 4 ++
dwarf_loader.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++---
dwarves.h | 38 +++++++++++++-
lib/bpf | 2 +-
pahole.c | 8 +++
6 files changed, 190 insertions(+), 9 deletions(-)
--
2.30.2
next reply other threads:[~2021-11-23 4:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-23 4:56 Yonghong Song [this message]
2021-11-23 4:56 ` [PATCH dwarves v2 1/4] libbpf: sync with latest libbpf repo Yonghong Song
2021-11-23 4:56 ` [PATCH dwarves v2 2/4] dutil: move DW_TAG_LLVM_annotation definition to dutil.h Yonghong Song
2021-11-23 4:56 ` [PATCH dwarves v2 3/4] dwarf_loader: support btf_type_tag attribute Yonghong Song
2021-11-23 4:56 ` [PATCH dwarves v2 4/4] btf_encoder: " Yonghong Song
2021-11-23 18:32 ` [PATCH dwarves v2 0/4] btf: " Andrii Nakryiko
2021-11-23 23:36 ` Arnaldo Carvalho de Melo
2021-11-24 3:56 ` Yonghong Song
2021-11-24 4:49 ` Andrii Nakryiko
2021-11-25 21:33 ` Arnaldo Carvalho de Melo
2021-11-26 5:37 ` Yonghong Song
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