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libbpf: Add btf__str_by_offset() as a more generic variant of name_by_offset

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BTF strings are used not just for names, they can be arbitrary strings used
for CO-RE relocations, line/func infos, etc. Thus "name_by_offset" terminology
is too specific and might be misleading. Instead, introduce
btf__str_by_offset() API which uses generic string terminology.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200929020533.711288-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-09-28 19:05:31 -07:00 committed by Alexei Starovoitov
parent 4a3b33f857
commit f86ed050bc
3 changed files with 8 additions and 1 deletions
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7
tools/lib/bpf/btf.c
View File

@ -1025,7 +1025,7 @@ const void *btf__get_raw_data(const struct btf *btf_ro, __u32 *size)
return btf->raw_data;
}
const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
const char *btf__str_by_offset(const struct btf *btf, __u32 offset)
{
if (offset < btf->hdr->str_len)
return btf->strs_data + offset;
@ -1033,6 +1033,11 @@ const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
return NULL;
}
const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
{
return btf__str_by_offset(btf, offset);
}
int btf__get_from_id(__u32 id, struct btf **btf)
{
struct bpf_btf_info btf_info = { 0 };

1
tools/lib/bpf/btf.h
View File

@ -49,6 +49,7 @@ LIBBPF_API int btf__fd(const struct btf *btf);
LIBBPF_API void btf__set_fd(struct btf *btf, int fd);
LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset);
LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
__u32 expected_key_size,

1
tools/lib/bpf/libbpf.map
View File

@ -327,6 +327,7 @@ LIBBPF_0.2.0 {
btf__add_volatile;
btf__find_str;
btf__new_empty;
btf__str_by_offset;
perf_buffer__buffer_cnt;
perf_buffer__buffer_fd;
perf_buffer__epoll_fd;