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libbpf: Walk types in btf_dump_resize(), not in mark_referenced()

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btf_dump_mark_referenced() both walks every type added since the last
resize and decides what each one references. Move the walk out to
btf_dump_resize() and hand the function one type at a time, so a second
per-type job can share the same pass instead of adding another one.

No functional change.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20260929234608.48503-2-ihor.solodrai@linux.dev
This commit is contained in:
Ihor Solodrai authored and Andrii Nakryiko committed 2026-10-02 05:41:50 -07:00
1 parent 28826c4922
commit 04312c5dfc
1 file changed
+60 -62
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src/btf_dump.c
+60 -62
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@@ -143,7 +143,7 @@ static void btf_dump_printf(const struct btf_dump *d, const char *fmt, ...)
va_end(args);
}
static int btf_dump_mark_referenced(struct btf_dump *d);
static int btf_dump_mark_referenced(struct btf_dump *d, const struct btf_type *t);
static int btf_dump_resize(struct btf_dump *d);
struct btf_dump *btf_dump__new(const struct btf *btf,
@@ -195,6 +195,8 @@ err:
static int btf_dump_resize(struct btf_dump *d)
{
int err, last_id = btf__type_cnt(d->btf) - 1;
const struct btf_type *t;
__u32 i;
if (last_id <= d->last_id)
return 0;
@@ -212,10 +214,13 @@ static int btf_dump_resize(struct btf_dump *d)
d->type_states[0].emit_state = EMITTED;
}
/* eagerly determine referenced types for anon enums */
err = btf_dump_mark_referenced(d);
if (err)
return err;
for (i = d->last_id + 1; i <= last_id; i++) {
t = btf__type_by_id(d->btf, i);
err = btf_dump_mark_referenced(d, t);
if (err)
return err;
}
d->last_id = last_id;
return 0;
@@ -312,71 +317,64 @@ int btf_dump__dump_type(struct btf_dump *d, __u32 id)
* top-level anonymous enum won't be referenced by anything, while embedded
* one will.
*/
static int btf_dump_mark_referenced(struct btf_dump *d)
static int btf_dump_mark_referenced(struct btf_dump *d, const struct btf_type *t)
{
int i, j, n = btf__type_cnt(d->btf);
const struct btf_type *t;
__u32 vlen;
__u32 j, vlen = btf_vlen(t);
for (i = d->last_id + 1; i < n; i++) {
t = btf__type_by_id(d->btf, i);
vlen = btf_vlen(t);
switch (btf_kind(t)) {
case BTF_KIND_INT:
case BTF_KIND_ENUM:
case BTF_KIND_ENUM64:
case BTF_KIND_FWD:
case BTF_KIND_FLOAT:
case BTF_KIND_LOC_PARAM:
case BTF_KIND_LOC_PROTO:
case BTF_KIND_LOCSEC:
break;
switch (btf_kind(t)) {
case BTF_KIND_INT:
case BTF_KIND_ENUM:
case BTF_KIND_ENUM64:
case BTF_KIND_FWD:
case BTF_KIND_FLOAT:
case BTF_KIND_LOC_PARAM:
case BTF_KIND_LOC_PROTO:
case BTF_KIND_LOCSEC:
break;
case BTF_KIND_VOLATILE:
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
case BTF_KIND_PTR:
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_VAR:
case BTF_KIND_DECL_TAG:
case BTF_KIND_TYPE_TAG:
d->type_states[t->type].referenced = 1;
break;
case BTF_KIND_VOLATILE:
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
case BTF_KIND_PTR:
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_VAR:
case BTF_KIND_DECL_TAG:
case BTF_KIND_TYPE_TAG:
d->type_states[t->type].referenced = 1;
break;
case BTF_KIND_ARRAY: {
const struct btf_array *a = btf_array(t);
case BTF_KIND_ARRAY: {
const struct btf_array *a = btf_array(t);
d->type_states[a->index_type].referenced = 1;
d->type_states[a->type].referenced = 1;
break;
}
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
const struct btf_member *m = btf_members(t);
d->type_states[a->index_type].referenced = 1;
d->type_states[a->type].referenced = 1;
break;
}
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
const struct btf_member *m = btf_members(t);
for (j = 0; j < vlen; j++, m++)
d->type_states[m->type].referenced = 1;
break;
}
case BTF_KIND_FUNC_PROTO: {
const struct btf_param *p = btf_params(t);
for (j = 0; j < vlen; j++, m++)
d->type_states[m->type].referenced = 1;
break;
}
case BTF_KIND_FUNC_PROTO: {
const struct btf_param *p = btf_params(t);
for (j = 0; j < vlen; j++, p++)
d->type_states[p->type].referenced = 1;
break;
}
case BTF_KIND_DATASEC: {
const struct btf_var_secinfo *v = btf_var_secinfos(t);
for (j = 0; j < vlen; j++, p++)
d->type_states[p->type].referenced = 1;
break;
}
case BTF_KIND_DATASEC: {
const struct btf_var_secinfo *v = btf_var_secinfos(t);
for (j = 0; j < vlen; j++, v++)
d->type_states[v->type].referenced = 1;
break;
}
default:
return -EINVAL;
}
for (j = 0; j < vlen; j++, v++)
d->type_states[v->type].referenced = 1;
break;
}
default:
return -EINVAL;
}
return 0;
}