summaryrefslogtreecommitdiff
path: root/tools/lib/bpf/btf_dump.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/lib/bpf/btf_dump.c')
-rw-r--r--tools/lib/bpf/btf_dump.c119
1 files changed, 52 insertions, 67 deletions
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index cb126d8fcf75..bd09ed1710f1 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -18,6 +18,9 @@
#include "libbpf.h"
#include "libbpf_internal.h"
+/* make sure libbpf doesn't use kernel-only integer typedefs */
+#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
+
static const char PREFIXES[] = "\t\t\t\t\t\t\t\t\t\t\t\t\t";
static const size_t PREFIX_CNT = sizeof(PREFIXES) - 1;
@@ -116,6 +119,8 @@ 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);
+
struct btf_dump *btf_dump__new(const struct btf *btf,
const struct btf_ext *btf_ext,
const struct btf_dump_opts *opts,
@@ -137,18 +142,40 @@ struct btf_dump *btf_dump__new(const struct btf *btf,
if (IS_ERR(d->type_names)) {
err = PTR_ERR(d->type_names);
d->type_names = NULL;
- btf_dump__free(d);
- return ERR_PTR(err);
+ goto err;
}
d->ident_names = hashmap__new(str_hash_fn, str_equal_fn, NULL);
if (IS_ERR(d->ident_names)) {
err = PTR_ERR(d->ident_names);
d->ident_names = NULL;
- btf_dump__free(d);
- return ERR_PTR(err);
+ goto err;
+ }
+ d->type_states = calloc(1 + btf__get_nr_types(d->btf),
+ sizeof(d->type_states[0]));
+ if (!d->type_states) {
+ err = -ENOMEM;
+ goto err;
+ }
+ d->cached_names = calloc(1 + btf__get_nr_types(d->btf),
+ sizeof(d->cached_names[0]));
+ if (!d->cached_names) {
+ err = -ENOMEM;
+ goto err;
}
+ /* VOID is special */
+ d->type_states[0].order_state = ORDERED;
+ d->type_states[0].emit_state = EMITTED;
+
+ /* eagerly determine referenced types for anon enums */
+ err = btf_dump_mark_referenced(d);
+ if (err)
+ goto err;
+
return d;
+err:
+ btf_dump__free(d);
+ return ERR_PTR(err);
}
void btf_dump__free(struct btf_dump *d)
@@ -175,7 +202,6 @@ void btf_dump__free(struct btf_dump *d)
free(d);
}
-static int btf_dump_mark_referenced(struct btf_dump *d);
static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr);
static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id);
@@ -202,27 +228,6 @@ int btf_dump__dump_type(struct btf_dump *d, __u32 id)
if (id > btf__get_nr_types(d->btf))
return -EINVAL;
- /* type states are lazily allocated, as they might not be needed */
- if (!d->type_states) {
- d->type_states = calloc(1 + btf__get_nr_types(d->btf),
- sizeof(d->type_states[0]));
- if (!d->type_states)
- return -ENOMEM;
- d->cached_names = calloc(1 + btf__get_nr_types(d->btf),
- sizeof(d->cached_names[0]));
- if (!d->cached_names)
- return -ENOMEM;
-
- /* VOID is special */
- d->type_states[0].order_state = ORDERED;
- d->type_states[0].emit_state = EMITTED;
-
- /* eagerly determine referenced types for anon enums */
- err = btf_dump_mark_referenced(d);
- if (err)
- return err;
- }
-
d->emit_queue_cnt = 0;
err = btf_dump_order_type(d, id, false);
if (err < 0)
@@ -752,41 +757,6 @@ static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id)
}
}
-static int btf_align_of(const struct btf *btf, __u32 id)
-{
- const struct btf_type *t = btf__type_by_id(btf, id);
- __u16 kind = btf_kind(t);
-
- switch (kind) {
- case BTF_KIND_INT:
- case BTF_KIND_ENUM:
- return min(sizeof(void *), t->size);
- case BTF_KIND_PTR:
- return sizeof(void *);
- case BTF_KIND_TYPEDEF:
- case BTF_KIND_VOLATILE:
- case BTF_KIND_CONST:
- case BTF_KIND_RESTRICT:
- return btf_align_of(btf, t->type);
- case BTF_KIND_ARRAY:
- return btf_align_of(btf, btf_array(t)->type);
- case BTF_KIND_STRUCT:
- case BTF_KIND_UNION: {
- const struct btf_member *m = btf_members(t);
- __u16 vlen = btf_vlen(t);
- int i, align = 1;
-
- for (i = 0; i < vlen; i++, m++)
- align = max(align, btf_align_of(btf, m->type));
-
- return align;
- }
- default:
- pr_warn("unsupported BTF_KIND:%u\n", btf_kind(t));
- return 1;
- }
-}
-
static bool btf_is_struct_packed(const struct btf *btf, __u32 id,
const struct btf_type *t)
{
@@ -794,18 +764,18 @@ static bool btf_is_struct_packed(const struct btf *btf, __u32 id,
int align, i, bit_sz;
__u16 vlen;
- align = btf_align_of(btf, id);
+ align = btf__align_of(btf, id);
/* size of a non-packed struct has to be a multiple of its alignment*/
- if (t->size % align)
+ if (align && t->size % align)
return true;
m = btf_members(t);
vlen = btf_vlen(t);
/* all non-bitfield fields have to be naturally aligned */
for (i = 0; i < vlen; i++, m++) {
- align = btf_align_of(btf, m->type);
+ align = btf__align_of(btf, m->type);
bit_sz = btf_member_bitfield_size(t, i);
- if (bit_sz == 0 && m->offset % (8 * align) != 0)
+ if (align && bit_sz == 0 && m->offset % (8 * align) != 0)
return true;
}
@@ -889,7 +859,7 @@ static void btf_dump_emit_struct_def(struct btf_dump *d,
fname = btf_name_of(d, m->name_off);
m_sz = btf_member_bitfield_size(t, i);
m_off = btf_member_bit_offset(t, i);
- align = packed ? 1 : btf_align_of(d->btf, m->type);
+ align = packed ? 1 : btf__align_of(d->btf, m->type);
btf_dump_emit_bit_padding(d, off, m_off, m_sz, align, lvl + 1);
btf_dump_printf(d, "\n%s", pfx(lvl + 1));
@@ -907,7 +877,7 @@ static void btf_dump_emit_struct_def(struct btf_dump *d,
/* pad at the end, if necessary */
if (is_struct) {
- align = packed ? 1 : btf_align_of(d->btf, id);
+ align = packed ? 1 : btf__align_of(d->btf, id);
btf_dump_emit_bit_padding(d, off, t->size * 8, 0, align,
lvl + 1);
}
@@ -1051,6 +1021,21 @@ static int btf_dump_push_decl_stack_id(struct btf_dump *d, __u32 id)
* of a stack frame. Some care is required to "pop" stack frames after
* processing type declaration chain.
*/
+int btf_dump__emit_type_decl(struct btf_dump *d, __u32 id,
+ const struct btf_dump_emit_type_decl_opts *opts)
+{
+ const char *fname;
+ int lvl;
+
+ if (!OPTS_VALID(opts, btf_dump_emit_type_decl_opts))
+ return -EINVAL;
+
+ fname = OPTS_GET(opts, field_name, NULL);
+ lvl = OPTS_GET(opts, indent_level, 0);
+ btf_dump_emit_type_decl(d, id, fname, lvl);
+ return 0;
+}
+
static void btf_dump_emit_type_decl(struct btf_dump *d, __u32 id,
const char *fname, int lvl)
{
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-04 00:55:53 +0300