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btf: expose API to work with raw btf data

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This patch exposes new API btf__get_raw_data() that allows to get a copy
of raw BTF data out of struct btf. This is useful for external programs
that need to manipulate raw data, e.g., pahole using btf__dedup() to
deduplicate BTF type info and then writing it back to file.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-02-08 11:19:37 -08:00 committed by Alexei Starovoitov
parent d29d87f7e6
commit 02c874460f
3 changed files with 8 additions and 0 deletions
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6
tools/lib/bpf/btf.c
View File

@ -439,6 +439,12 @@ int btf__fd(const struct btf *btf)
return btf->fd;
}
const void *btf__get_raw_data(const struct btf *btf, __u32 *size)
{
*size = btf->data_size;
return btf->data;
}
void btf__get_strings(const struct btf *btf, const char **strings,
__u32 *str_len)
{

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

@ -66,6 +66,7 @@ LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
LIBBPF_API int btf__fd(const struct btf *btf);
LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
LIBBPF_API void btf__get_strings(const struct btf *btf, const char **strings,
__u32 *str_len);
LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);

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

@ -136,6 +136,7 @@ LIBBPF_0.0.2 {
btf__dedup;
btf__get_map_kv_tids;
btf__get_nr_types;
btf__get_raw_data;
btf__get_strings;
btf__load;
btf_ext__free;