[PATCH v3 bpf-next 2/4] btf: expose API to work with raw btf data

[Andrii Nakryiko]

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 <andr...@fb.com>
Acked-by: Song Liu <songliubrav...@fb.com>
---
 tools/lib/bpf/btf.c      | 6 ++++++
 tools/lib/bpf/btf.h      | 1 +
 tools/lib/bpf/libbpf.map | 1 +
 3 files changed, 8 insertions(+)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 24ac64492d8a..8730f6c3be9e 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -437,6 +437,12 @@ 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)
 {
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 6fbbde95abc0..d6c0a5576fdc 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -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);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index f5372df143f4..9e10467f8cbb 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -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;
-- 
2.17.1