Commit 02c87446 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

btf: expose API to work with raw btf data 



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: default avatarAndrii Nakryiko <andriin@fb.com>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent d29d87f7

tools/lib/bpf/btf.c

+6 −0
Original line number Diff line number Diff line
@@ -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)

{

tools/lib/bpf/btf.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

tools/lib/bpf/libbpf.map

+1 −0
Original line number Diff line number Diff line
@@ -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;

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