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Diffstat (limited to 'tools/lib/bpf/btf.c')
-rw-r--r--tools/lib/bpf/btf.c43
1 files changed, 34 insertions, 9 deletions
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index c36a3a76986a..cf94b0770522 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -16,6 +16,11 @@
#define BTF_MAX_NR_TYPES 65535
+#define IS_MODIFIER(k) (((k) == BTF_KIND_TYPEDEF) || \
+ ((k) == BTF_KIND_VOLATILE) || \
+ ((k) == BTF_KIND_CONST) || \
+ ((k) == BTF_KIND_RESTRICT))
+
static struct btf_type btf_void;
struct btf {
@@ -32,14 +37,6 @@ struct btf {
int fd;
};
-static const char *btf_name_by_offset(const struct btf *btf, __u32 offset)
-{
- if (offset < btf->hdr->str_len)
- return &btf->strings[offset];
- else
- return NULL;
-}
-
static int btf_add_type(struct btf *btf, struct btf_type *t)
{
if (btf->types_size - btf->nr_types < 2) {
@@ -269,6 +266,26 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
return nelems * size;
}
+int btf__resolve_type(const struct btf *btf, __u32 type_id)
+{
+ const struct btf_type *t;
+ int depth = 0;
+
+ t = btf__type_by_id(btf, type_id);
+ while (depth < MAX_RESOLVE_DEPTH &&
+ !btf_type_is_void_or_null(t) &&
+ IS_MODIFIER(BTF_INFO_KIND(t->info))) {
+ type_id = t->type;
+ t = btf__type_by_id(btf, type_id);
+ depth++;
+ }
+
+ if (depth == MAX_RESOLVE_DEPTH || btf_type_is_void_or_null(t))
+ return -EINVAL;
+
+ return type_id;
+}
+
__s32 btf__find_by_name(const struct btf *btf, const char *type_name)
{
__u32 i;
@@ -278,7 +295,7 @@ __s32 btf__find_by_name(const struct btf *btf, const char *type_name)
for (i = 1; i <= btf->nr_types; i++) {
const struct btf_type *t = btf->types[i];
- const char *name = btf_name_by_offset(btf, t->name_off);
+ const char *name = btf__name_by_offset(btf, t->name_off);
if (name && !strcmp(type_name, name))
return i;
@@ -368,3 +385,11 @@ int btf__fd(const struct btf *btf)
{
return btf->fd;
}
+
+const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
+{
+ if (offset < btf->hdr->str_len)
+ return &btf->strings[offset];
+ else
+ return NULL;
+}