[PATCH bpf-next 3/3] tools/resolve_btfids: use libbpf's btf__parse() API

[Andrii Nakryiko]

Instead of re-implementing generic BTF parsing logic, use libbpf's API.
Also add .gitignore for resolve_btfids's build artifacts.

Signed-off-by: Andrii Nakryiko <andr...@fb.com>
---
 tools/bpf/resolve_btfids/.gitignore |  4 ++
 tools/bpf/resolve_btfids/main.c     | 58 +----------------------------
 2 files changed, 5 insertions(+), 57 deletions(-)
 create mode 100644 tools/bpf/resolve_btfids/.gitignore

diff --git a/tools/bpf/resolve_btfids/.gitignore 
b/tools/bpf/resolve_btfids/.gitignore
new file mode 100644
index 000000000000..a026df7dc280
--- /dev/null
+++ b/tools/bpf/resolve_btfids/.gitignore
@@ -0,0 +1,4 @@
+/FEATURE-DUMP.libbpf
+/bpf_helper_defs.h
+/fixdep
+/resolve_btfids
diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index 6956b6350cad..52d883325a23 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -403,62 +403,6 @@ static int symbols_collect(struct object *obj)
        return 0;
 }
 
-static struct btf *btf__parse_raw(const char *file)
-{
-       struct btf *btf;
-       struct stat st;
-       __u8 *buf;
-       FILE *f;
-
-       if (stat(file, &st))
-               return NULL;
-
-       f = fopen(file, "rb");
-       if (!f)
-               return NULL;
-
-       buf = malloc(st.st_size);
-       if (!buf) {
-               btf = ERR_PTR(-ENOMEM);
-               goto exit_close;
-       }
-
-       if ((size_t) st.st_size != fread(buf, 1, st.st_size, f)) {
-               btf = ERR_PTR(-EINVAL);
-               goto exit_free;
-       }
-
-       btf = btf__new(buf, st.st_size);
-
-exit_free:
-       free(buf);
-exit_close:
-       fclose(f);
-       return btf;
-}
-
-static bool is_btf_raw(const char *file)
-{
-       __u16 magic = 0;
-       int fd, nb_read;
-
-       fd = open(file, O_RDONLY);
-       if (fd < 0)
-               return false;
-
-       nb_read = read(fd, &magic, sizeof(magic));
-       close(fd);
-       return nb_read == sizeof(magic) && magic == BTF_MAGIC;
-}
-
-static struct btf *btf_open(const char *path)
-{
-       if (is_btf_raw(path))
-               return btf__parse_raw(path);
-       else
-               return btf__parse_elf(path, NULL);
-}
-
 static int symbols_resolve(struct object *obj)
 {
        int nr_typedefs = obj->nr_typedefs;
@@ -469,7 +413,7 @@ static int symbols_resolve(struct object *obj)
        struct btf *btf;
        __u32 nr;
 
-       btf = btf_open(obj->btf ?: obj->path);
+       btf = btf__parse(obj->btf ?: obj->path, NULL);
        err = libbpf_get_error(btf);
        if (err) {
                pr_err("FAILED: load BTF from %s: %s",
-- 
2.24.1