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libbpf: convert libbpf code to use new btf helpers 

Simplify code by relying on newly added BTF helper functions.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-08-07 14:39:49 -07:00 committed by Alexei Starovoitov
parent ef20a9b27c
commit b03bc6853c
3 changed files with 158 additions and 221 deletions
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181
tools/lib/bpf/btf.c
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@ -19,13 +19,6 @@
#define BTF_MAX_NR_TYPES 0x7fffffff
#define BTF_MAX_STR_OFFSET 0x7fffffff
#define IS_MODIFIER(k) (((k) == BTF_KIND_TYPEDEF) || \
((k) == BTF_KIND_VOLATILE) || \
((k) == BTF_KIND_CONST) || \
((k) == BTF_KIND_RESTRICT))
#define IS_VAR(k) ((k) == BTF_KIND_VAR)
static struct btf_type btf_void;
struct btf {
@ -192,9 +185,9 @@ static int btf_parse_str_sec(struct btf *btf)
static int btf_type_size(struct btf_type *t)
{
int base_size = sizeof(struct btf_type);
__u16 vlen = BTF_INFO_VLEN(t->info);
__u16 vlen = btf_vlen(t);
switch (BTF_INFO_KIND(t->info)) {
switch (btf_kind(t)) {
case BTF_KIND_FWD:
case BTF_KIND_CONST:
case BTF_KIND_VOLATILE:
@ -219,7 +212,7 @@ static int btf_type_size(struct btf_type *t)
case BTF_KIND_DATASEC:
return base_size + vlen * sizeof(struct btf_var_secinfo);
default:
pr_debug("Unsupported BTF_KIND:%u\n", BTF_INFO_KIND(t->info));
pr_debug("Unsupported BTF_KIND:%u\n", btf_kind(t));
return -EINVAL;
}
}
@ -263,7 +256,7 @@ const struct btf_type *btf__type_by_id(const struct btf *btf, __u32 type_id)
static bool btf_type_is_void(const struct btf_type *t)
{
return t == &btf_void || BTF_INFO_KIND(t->info) == BTF_KIND_FWD;
return t == &btf_void || btf_is_fwd(t);
}
static bool btf_type_is_void_or_null(const struct btf_type *t)
@ -284,7 +277,7 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
t = btf__type_by_id(btf, type_id);
for (i = 0; i < MAX_RESOLVE_DEPTH && !btf_type_is_void_or_null(t);
i++) {
switch (BTF_INFO_KIND(t->info)) {
switch (btf_kind(t)) {
case BTF_KIND_INT:
case BTF_KIND_STRUCT:
case BTF_KIND_UNION:
@ -303,7 +296,7 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
type_id = t->type;
break;
case BTF_KIND_ARRAY:
array = (const struct btf_array *)(t + 1);
array = btf_array(t);
if (nelems && array->nelems > UINT32_MAX / nelems)
return -E2BIG;
nelems *= array->nelems;
@ -334,8 +327,7 @@ int btf__resolve_type(const struct btf *btf, __u32 type_id)
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)) ||
IS_VAR(BTF_INFO_KIND(t->info)))) {
(btf_is_mod(t) || btf_is_typedef(t) || btf_is_var(t))) {
type_id = t->type;
t = btf__type_by_id(btf, type_id);
depth++;
@ -554,11 +546,11 @@ static int compare_vsi_off(const void *_a, const void *_b)
static int btf_fixup_datasec(struct bpf_object *obj, struct btf *btf,
struct btf_type *t)
{
__u32 size = 0, off = 0, i, vars = BTF_INFO_VLEN(t->info);
__u32 size = 0, off = 0, i, vars = btf_vlen(t);
const char *name = btf__name_by_offset(btf, t->name_off);
const struct btf_type *t_var;
struct btf_var_secinfo *vsi;
struct btf_var *var;
const struct btf_var *var;
int ret;
if (!name) {
@ -574,12 +566,11 @@ static int btf_fixup_datasec(struct bpf_object *obj, struct btf *btf,
t->size = size;
for (i = 0, vsi = (struct btf_var_secinfo *)(t + 1);
i < vars; i++, vsi++) {
for (i = 0, vsi = btf_var_secinfos(t); i < vars; i++, vsi++) {
t_var = btf__type_by_id(btf, vsi->type);
var = (struct btf_var *)(t_var + 1);
var = btf_var(t_var);
if (BTF_INFO_KIND(t_var->info) != BTF_KIND_VAR) {
if (!btf_is_var(t_var)) {
pr_debug("Non-VAR type seen in section %s\n", name);
return -EINVAL;
}
@ -595,7 +586,8 @@ static int btf_fixup_datasec(struct bpf_object *obj, struct btf *btf,
ret = bpf_object__variable_offset(obj, name, &off);
if (ret) {
pr_debug("No offset found in symbol table for VAR %s\n", name);
pr_debug("No offset found in symbol table for VAR %s\n",
name);
return -ENOENT;
}
@ -619,7 +611,7 @@ int btf__finalize_data(struct bpf_object *obj, struct btf *btf)
* is section size and global variable offset. We use
* the info from the ELF itself for this purpose.
*/
if (BTF_INFO_KIND(t->info) == BTF_KIND_DATASEC) {
if (btf_is_datasec(t)) {
err = btf_fixup_datasec(obj, btf, t);
if (err)
break;
@ -774,14 +766,13 @@ int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
return -EINVAL;
}
if (BTF_INFO_KIND(container_type->info) != BTF_KIND_STRUCT ||
BTF_INFO_VLEN(container_type->info) < 2) {
if (!btf_is_struct(container_type) || btf_vlen(container_type) < 2) {
pr_warning("map:%s container_name:%s is an invalid container struct\n",
map_name, container_name);
return -EINVAL;
}
key = (struct btf_member *)(container_type + 1);
key = btf_members(container_type);
value = key + 1;
key_size = btf__resolve_size(btf, key->type);
@ -1440,10 +1431,9 @@ static struct btf_dedup *btf_dedup_new(struct btf *btf, struct btf_ext *btf_ext,
d->map[0] = 0;
for (i = 1; i <= btf->nr_types; i++) {
struct btf_type *t = d->btf->types[i];
__u16 kind = BTF_INFO_KIND(t->info);
/* VAR and DATASEC are never deduped and are self-canonical */
if (kind == BTF_KIND_VAR || kind == BTF_KIND_DATASEC)
if (btf_is_var(t) || btf_is_datasec(t))
d->map[i] = i;
else
d->map[i] = BTF_UNPROCESSED_ID;
@ -1484,11 +1474,11 @@ static int btf_for_each_str_off(struct btf_dedup *d, str_off_fn_t fn, void *ctx)
if (r)
return r;
switch (BTF_INFO_KIND(t->info)) {
switch (btf_kind(t)) {
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
struct btf_member *m = (struct btf_member *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
struct btf_member *m = btf_members(t);
__u16 vlen = btf_vlen(t);
for (j = 0; j < vlen; j++) {
r = fn(&m->name_off, ctx);
@ -1499,8 +1489,8 @@ static int btf_for_each_str_off(struct btf_dedup *d, str_off_fn_t fn, void *ctx)
break;
}
case BTF_KIND_ENUM: {
struct btf_enum *m = (struct btf_enum *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
struct btf_enum *m = btf_enum(t);
__u16 vlen = btf_vlen(t);
for (j = 0; j < vlen; j++) {
r = fn(&m->name_off, ctx);
@ -1511,8 +1501,8 @@ static int btf_for_each_str_off(struct btf_dedup *d, str_off_fn_t fn, void *ctx)
break;
}
case BTF_KIND_FUNC_PROTO: {
struct btf_param *m = (struct btf_param *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
struct btf_param *m = btf_params(t);
__u16 vlen = btf_vlen(t);
for (j = 0; j < vlen; j++) {
r = fn(&m->name_off, ctx);
@ -1801,16 +1791,16 @@ static long btf_hash_enum(struct btf_type *t)
/* Check structural equality of two ENUMs. */
static bool btf_equal_enum(struct btf_type *t1, struct btf_type *t2)
{
struct btf_enum *m1, *m2;
const struct btf_enum *m1, *m2;
__u16 vlen;
int i;
if (!btf_equal_common(t1, t2))
return false;
vlen = BTF_INFO_VLEN(t1->info);
m1 = (struct btf_enum *)(t1 + 1);
m2 = (struct btf_enum *)(t2 + 1);
vlen = btf_vlen(t1);
m1 = btf_enum(t1);
m2 = btf_enum(t2);
for (i = 0; i < vlen; i++) {
if (m1->name_off != m2->name_off || m1->val != m2->val)
return false;
@ -1822,8 +1812,7 @@ static bool btf_equal_enum(struct btf_type *t1, struct btf_type *t2)
static inline bool btf_is_enum_fwd(struct btf_type *t)
{
return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM &&
BTF_INFO_VLEN(t->info) == 0;
return btf_is_enum(t) && btf_vlen(t) == 0;
}
static bool btf_compat_enum(struct btf_type *t1, struct btf_type *t2)
@ -1843,8 +1832,8 @@ static bool btf_compat_enum(struct btf_type *t1, struct btf_type *t2)
*/
static long btf_hash_struct(struct btf_type *t)
{
struct btf_member *member = (struct btf_member *)(t + 1);
__u32 vlen = BTF_INFO_VLEN(t->info);
const struct btf_member *member = btf_members(t);
__u32 vlen = btf_vlen(t);
long h = btf_hash_common(t);
int i;
@ -1864,16 +1853,16 @@ static long btf_hash_struct(struct btf_type *t)
*/
static bool btf_shallow_equal_struct(struct btf_type *t1, struct btf_type *t2)
{
struct btf_member *m1, *m2;
const struct btf_member *m1, *m2;
__u16 vlen;
int i;
if (!btf_equal_common(t1, t2))
return false;
vlen = BTF_INFO_VLEN(t1->info);
m1 = (struct btf_member *)(t1 + 1);
m2 = (struct btf_member *)(t2 + 1);
vlen = btf_vlen(t1);
m1 = btf_members(t1);
m2 = btf_members(t2);
for (i = 0; i < vlen; i++) {
if (m1->name_off != m2->name_off || m1->offset != m2->offset)
return false;
@ -1890,7 +1879,7 @@ static bool btf_shallow_equal_struct(struct btf_type *t1, struct btf_type *t2)
*/
static long btf_hash_array(struct btf_type *t)
{
struct btf_array *info = (struct btf_array *)(t + 1);
const struct btf_array *info = btf_array(t);
long h = btf_hash_common(t);
h = hash_combine(h, info->type);
@ -1908,13 +1897,13 @@ static long btf_hash_array(struct btf_type *t)
*/
static bool btf_equal_array(struct btf_type *t1, struct btf_type *t2)
{
struct btf_array *info1, *info2;
const struct btf_array *info1, *info2;
if (!btf_equal_common(t1, t2))
return false;
info1 = (struct btf_array *)(t1 + 1);
info2 = (struct btf_array *)(t2 + 1);
info1 = btf_array(t1);
info2 = btf_array(t2);
return info1->type == info2->type &&
info1->index_type == info2->index_type &&
info1->nelems == info2->nelems;
@ -1927,14 +1916,10 @@ static bool btf_equal_array(struct btf_type *t1, struct btf_type *t2)
*/
static bool btf_compat_array(struct btf_type *t1, struct btf_type *t2)
{
struct btf_array *info1, *info2;
if (!btf_equal_common(t1, t2))
return false;
info1 = (struct btf_array *)(t1 + 1);
info2 = (struct btf_array *)(t2 + 1);
return info1->nelems == info2->nelems;
return btf_array(t1)->nelems == btf_array(t2)->nelems;
}
/*
@ -1944,8 +1929,8 @@ static bool btf_compat_array(struct btf_type *t1, struct btf_type *t2)
*/
static long btf_hash_fnproto(struct btf_type *t)
{
struct btf_param *member = (struct btf_param *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
const struct btf_param *member = btf_params(t);
__u16 vlen = btf_vlen(t);
long h = btf_hash_common(t);
int i;
@ -1966,16 +1951,16 @@ static long btf_hash_fnproto(struct btf_type *t)
*/
static bool btf_equal_fnproto(struct btf_type *t1, struct btf_type *t2)
{
struct btf_param *m1, *m2;
const struct btf_param *m1, *m2;
__u16 vlen;
int i;
if (!btf_equal_common(t1, t2))
return false;
vlen = BTF_INFO_VLEN(t1->info);
m1 = (struct btf_param *)(t1 + 1);
m2 = (struct btf_param *)(t2 + 1);
vlen = btf_vlen(t1);
m1 = btf_params(t1);
m2 = btf_params(t2);
for (i = 0; i < vlen; i++) {
if (m1->name_off != m2->name_off || m1->type != m2->type)
return false;
@ -1992,7 +1977,7 @@ static bool btf_equal_fnproto(struct btf_type *t1, struct btf_type *t2)
*/
static bool btf_compat_fnproto(struct btf_type *t1, struct btf_type *t2)
{
struct btf_param *m1, *m2;
const struct btf_param *m1, *m2;
__u16 vlen;
int i;
@ -2000,9 +1985,9 @@ static bool btf_compat_fnproto(struct btf_type *t1, struct btf_type *t2)
if (t1->name_off != t2->name_off || t1->info != t2->info)
return false;
vlen = BTF_INFO_VLEN(t1->info);
m1 = (struct btf_param *)(t1 + 1);
m2 = (struct btf_param *)(t2 + 1);
vlen = btf_vlen(t1);
m1 = btf_params(t1);
m2 = btf_params(t2);
for (i = 0; i < vlen; i++) {
if (m1->name_off != m2->name_off)
return false;
@ -2028,7 +2013,7 @@ static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
__u32 cand_id;
long h;
switch (BTF_INFO_KIND(t->info)) {
switch (btf_kind(t)) {
case BTF_KIND_CONST:
case BTF_KIND_VOLATILE:
case BTF_KIND_RESTRICT:
@ -2141,13 +2126,13 @@ static uint32_t resolve_fwd_id(struct btf_dedup *d, uint32_t type_id)
{
__u32 orig_type_id = type_id;
if (BTF_INFO_KIND(d->btf->types[type_id]->info) != BTF_KIND_FWD)
if (!btf_is_fwd(d->btf->types[type_id]))
return type_id;
while (is_type_mapped(d, type_id) && d->map[type_id] != type_id)
type_id = d->map[type_id];
if (BTF_INFO_KIND(d->btf->types[type_id]->info) != BTF_KIND_FWD)
if (!btf_is_fwd(d->btf->types[type_id]))
return type_id;
return orig_type_id;
@ -2156,7 +2141,7 @@ static uint32_t resolve_fwd_id(struct btf_dedup *d, uint32_t type_id)
static inline __u16 btf_fwd_kind(struct btf_type *t)
{
return BTF_INFO_KFLAG(t->info) ? BTF_KIND_UNION : BTF_KIND_STRUCT;
return btf_kflag(t) ? BTF_KIND_UNION : BTF_KIND_STRUCT;
}
/*
@ -2277,8 +2262,8 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
cand_type = d->btf->types[cand_id];
canon_type = d->btf->types[canon_id];
cand_kind = BTF_INFO_KIND(cand_type->info);
canon_kind = BTF_INFO_KIND(canon_type->info);
cand_kind = btf_kind(cand_type);
canon_kind = btf_kind(canon_type);
if (cand_type->name_off != canon_type->name_off)
return 0;
@ -2327,12 +2312,12 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
return btf_dedup_is_equiv(d, cand_type->type, canon_type->type);
case BTF_KIND_ARRAY: {
struct btf_array *cand_arr, *canon_arr;
const struct btf_array *cand_arr, *canon_arr;
if (!btf_compat_array(cand_type, canon_type))
return 0;
cand_arr = (struct btf_array *)(cand_type + 1);
canon_arr = (struct btf_array *)(canon_type + 1);
cand_arr = btf_array(cand_type);
canon_arr = btf_array(canon_type);
eq = btf_dedup_is_equiv(d,
cand_arr->index_type, canon_arr->index_type);
if (eq <= 0)
@ -2342,14 +2327,14 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
struct btf_member *cand_m, *canon_m;
const struct btf_member *cand_m, *canon_m;
__u16 vlen;
if (!btf_shallow_equal_struct(cand_type, canon_type))
return 0;
vlen = BTF_INFO_VLEN(cand_type->info);
cand_m = (struct btf_member *)(cand_type + 1);
canon_m = (struct btf_member *)(canon_type + 1);
vlen = btf_vlen(cand_type);
cand_m = btf_members(cand_type);
canon_m = btf_members(canon_type);
for (i = 0; i < vlen; i++) {
eq = btf_dedup_is_equiv(d, cand_m->type, canon_m->type);
if (eq <= 0)
@ -2362,7 +2347,7 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
}
case BTF_KIND_FUNC_PROTO: {
struct btf_param *cand_p, *canon_p;
const struct btf_param *cand_p, *canon_p;
__u16 vlen;
if (!btf_compat_fnproto(cand_type, canon_type))
@ -2370,9 +2355,9 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
eq = btf_dedup_is_equiv(d, cand_type->type, canon_type->type);
if (eq <= 0)
return eq;
vlen = BTF_INFO_VLEN(cand_type->info);
cand_p = (struct btf_param *)(cand_type + 1);
canon_p = (struct btf_param *)(canon_type + 1);
vlen = btf_vlen(cand_type);
cand_p = btf_params(cand_type);
canon_p = btf_params(canon_type);
for (i = 0; i < vlen; i++) {
eq = btf_dedup_is_equiv(d, cand_p->type, canon_p->type);
if (eq <= 0)
@ -2427,8 +2412,8 @@ static void btf_dedup_merge_hypot_map(struct btf_dedup *d)
targ_type_id = d->hypot_map[cand_type_id];
t_id = resolve_type_id(d, targ_type_id);
c_id = resolve_type_id(d, cand_type_id);
t_kind = BTF_INFO_KIND(d->btf->types[t_id]->info);
c_kind = BTF_INFO_KIND(d->btf->types[c_id]->info);
t_kind = btf_kind(d->btf->types[t_id]);
c_kind = btf_kind(d->btf->types[c_id]);
/*
* Resolve FWD into STRUCT/UNION.
* It's ok to resolve FWD into STRUCT/UNION that's not yet
@ -2497,7 +2482,7 @@ static int btf_dedup_struct_type(struct btf_dedup *d, __u32 type_id)
return 0;
t = d->btf->types[type_id];
kind = BTF_INFO_KIND(t->info);
kind = btf_kind(t);
if (kind != BTF_KIND_STRUCT && kind != BTF_KIND_UNION)
return 0;
@ -2592,7 +2577,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
t = d->btf->types[type_id];
d->map[type_id] = BTF_IN_PROGRESS_ID;
switch (BTF_INFO_KIND(t->info)) {
switch (btf_kind(t)) {
case BTF_KIND_CONST:
case BTF_KIND_VOLATILE:
case BTF_KIND_RESTRICT:
@ -2616,7 +2601,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
break;
case BTF_KIND_ARRAY: {
struct btf_array *info = (struct btf_array *)(t + 1);
struct btf_array *info = btf_array(t);
ref_type_id = btf_dedup_ref_type(d, info->type);
if (ref_type_id < 0)
@ -2650,8 +2635,8 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
return ref_type_id;
t->type = ref_type_id;
vlen = BTF_INFO_VLEN(t->info);
param = (struct btf_param *)(t + 1);
vlen = btf_vlen(t);
param = btf_params(t);
for (i = 0; i < vlen; i++) {
ref_type_id = btf_dedup_ref_type(d, param->type);
if (ref_type_id < 0)
@ -2791,7 +2776,7 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
struct btf_type *t = d->btf->types[type_id];
int i, r;
switch (BTF_INFO_KIND(t->info)) {
switch (btf_kind(t)) {
case BTF_KIND_INT:
case BTF_KIND_ENUM:
break;
@ -2811,7 +2796,7 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
break;
case BTF_KIND_ARRAY: {
struct btf_array *arr_info = (struct btf_array *)(t + 1);
struct btf_array *arr_info = btf_array(t);
r = btf_dedup_remap_type_id(d, arr_info->type);
if (r < 0)
@ -2826,8 +2811,8 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
struct btf_member *member = (struct btf_member *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
struct btf_member *member = btf_members(t);
__u16 vlen = btf_vlen(t);
for (i = 0; i < vlen; i++) {
r = btf_dedup_remap_type_id(d, member->type);
@ -2840,8 +2825,8 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
}
case BTF_KIND_FUNC_PROTO: {
struct btf_param *param = (struct btf_param *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
struct btf_param *param = btf_params(t);
__u16 vlen = btf_vlen(t);
r = btf_dedup_remap_type_id(d, t->type);
if (r < 0)
@ -2859,8 +2844,8 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
}
case BTF_KIND_DATASEC: {
struct btf_var_secinfo *var = (struct btf_var_secinfo *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
struct btf_var_secinfo *var = btf_var_secinfos(t);
__u16 vlen = btf_vlen(t);
for (i = 0; i < vlen; i++) {
r = btf_dedup_remap_type_id(d, var->type);

138
tools/lib/bpf/btf_dump.c
View File

@ -100,21 +100,6 @@ static bool str_equal_fn(const void *a, const void *b, void *ctx)
return strcmp(a, b) == 0;
}
static __u16 btf_kind_of(const struct btf_type *t)
{
return BTF_INFO_KIND(t->info);
}
static __u16 btf_vlen_of(const struct btf_type *t)
{
return BTF_INFO_VLEN(t->info);
}
static bool btf_kflag_of(const struct btf_type *t)
{
return BTF_INFO_KFLAG(t->info);
}
static const char *btf_name_of(const struct btf_dump *d, __u32 name_off)
{
return btf__name_by_offset(d->btf, name_off);
@ -349,7 +334,7 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
*/
struct btf_dump_type_aux_state *tstate = &d->type_states[id];
const struct btf_type *t;
__u16 kind, vlen;
__u16 vlen;
int err, i;
/* return true, letting typedefs know that it's ok to be emitted */
@ -357,18 +342,16 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
return 1;
t = btf__type_by_id(d->btf, id);
kind = btf_kind_of(t);
if (tstate->order_state == ORDERING) {
/* type loop, but resolvable through fwd declaration */
if ((kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION) &&
through_ptr && t->name_off != 0)
if (btf_is_composite(t) && through_ptr && t->name_off != 0)
return 0;
pr_warning("unsatisfiable type cycle, id:[%u]\n", id);
return -ELOOP;
}
switch (kind) {
switch (btf_kind(t)) {
case BTF_KIND_INT:
tstate->order_state = ORDERED;
return 0;
@ -378,14 +361,12 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
tstate->order_state = ORDERED;
return err;
case BTF_KIND_ARRAY: {
const struct btf_array *a = (void *)(t + 1);
case BTF_KIND_ARRAY:
return btf_dump_order_type(d, btf_array(t)->type, through_ptr);
return btf_dump_order_type(d, a->type, through_ptr);
}
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
const struct btf_member *m = (void *)(t + 1);
const struct btf_member *m = btf_members(t);
/*
* struct/union is part of strong link, only if it's embedded
* (so no ptr in a path) or it's anonymous (so has to be
@ -396,7 +377,7 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
tstate->order_state = ORDERING;
vlen = btf_vlen_of(t);
vlen = btf_vlen(t);
for (i = 0; i < vlen; i++, m++) {
err = btf_dump_order_type(d, m->type, false);
if (err < 0)
@ -447,7 +428,7 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
return btf_dump_order_type(d, t->type, through_ptr);
case BTF_KIND_FUNC_PROTO: {
const struct btf_param *p = (void *)(t + 1);
const struct btf_param *p = btf_params(t);
bool is_strong;
err = btf_dump_order_type(d, t->type, through_ptr);
@ -455,7 +436,7 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
return err;
is_strong = err > 0;
vlen = btf_vlen_of(t);
vlen = btf_vlen(t);
for (i = 0; i < vlen; i++, p++) {
err = btf_dump_order_type(d, p->type, through_ptr);
if (err < 0)
@ -553,7 +534,7 @@ static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id)
return;
t = btf__type_by_id(d->btf, id);
kind = btf_kind_of(t);
kind = btf_kind(t);
if (top_level_def && t->name_off == 0) {
pr_warning("unexpected nameless definition, id:[%u]\n", id);
@ -618,12 +599,9 @@ static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id)
case BTF_KIND_RESTRICT:
btf_dump_emit_type(d, t->type, cont_id);
break;
case BTF_KIND_ARRAY: {
const struct btf_array *a = (void *)(t + 1);
btf_dump_emit_type(d, a->type, cont_id);
case BTF_KIND_ARRAY:
btf_dump_emit_type(d, btf_array(t)->type, cont_id);
break;
}
case BTF_KIND_FWD:
btf_dump_emit_fwd_def(d, id, t);
btf_dump_printf(d, ";\n\n");
@ -656,8 +634,8 @@ static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id)
* applicable
*/
if (top_level_def || t->name_off == 0) {
const struct btf_member *m = (void *)(t + 1);
__u16 vlen = btf_vlen_of(t);
const struct btf_member *m = btf_members(t);
__u16 vlen = btf_vlen(t);
int i, new_cont_id;
new_cont_id = t->name_off == 0 ? cont_id : id;
@ -678,8 +656,8 @@ static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id)
}
break;
case BTF_KIND_FUNC_PROTO: {
const struct btf_param *p = (void *)(t + 1);
__u16 vlen = btf_vlen_of(t);
const struct btf_param *p = btf_params(t);
__u16 vlen = btf_vlen(t);
int i;
btf_dump_emit_type(d, t->type, cont_id);
@ -696,7 +674,7 @@ 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_of(t);
__u16 kind = btf_kind(t);
switch (kind) {
case BTF_KIND_INT:
@ -709,15 +687,12 @@ static int btf_align_of(const struct btf *btf, __u32 id)
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
return btf_align_of(btf, t->type);
case BTF_KIND_ARRAY: {
const struct btf_array *a = (void *)(t + 1);
return btf_align_of(btf, a->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 = (void *)(t + 1);
__u16 vlen = btf_vlen_of(t);
const struct btf_member *m = btf_members(t);
__u16 vlen = btf_vlen(t);
int i, align = 1;
for (i = 0; i < vlen; i++, m++)
@ -726,7 +701,7 @@ static int btf_align_of(const struct btf *btf, __u32 id)
return align;
}
default:
pr_warning("unsupported BTF_KIND:%u\n", btf_kind_of(t));
pr_warning("unsupported BTF_KIND:%u\n", btf_kind(t));
return 1;
}
}
@ -737,20 +712,18 @@ static bool btf_is_struct_packed(const struct btf *btf, __u32 id,
const struct btf_member *m;
int align, i, bit_sz;
__u16 vlen;
bool kflag;
align = btf_align_of(btf, id);
/* size of a non-packed struct has to be a multiple of its alignment*/
if (t->size % align)
return true;
m = (void *)(t + 1);
kflag = btf_kflag_of(t);
vlen = btf_vlen_of(t);
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);
bit_sz = kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0;
bit_sz = btf_member_bitfield_size(t, i);
if (bit_sz == 0 && m->offset % (8 * align) != 0)
return true;
}
@ -807,7 +780,7 @@ static void btf_dump_emit_struct_fwd(struct btf_dump *d, __u32 id,
const struct btf_type *t)
{
btf_dump_printf(d, "%s %s",
btf_kind_of(t) == BTF_KIND_STRUCT ? "struct" : "union",
btf_is_struct(t) ? "struct" : "union",
btf_dump_type_name(d, id));
}
@ -816,12 +789,11 @@ static void btf_dump_emit_struct_def(struct btf_dump *d,
const struct btf_type *t,
int lvl)
{
const struct btf_member *m = (void *)(t + 1);
bool kflag = btf_kflag_of(t), is_struct;
const struct btf_member *m = btf_members(t);
bool is_struct = btf_is_struct(t);
int align, i, packed, off = 0;
__u16 vlen = btf_vlen_of(t);
__u16 vlen = btf_vlen(t);
is_struct = btf_kind_of(t) == BTF_KIND_STRUCT;
packed = is_struct ? btf_is_struct_packed(d->btf, id, t) : 0;
align = packed ? 1 : btf_align_of(d->btf, id);
@ -835,8 +807,8 @@ static void btf_dump_emit_struct_def(struct btf_dump *d,
int m_off, m_sz;
fname = btf_name_of(d, m->name_off);
m_sz = kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0;
m_off = kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset;
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);
btf_dump_emit_bit_padding(d, off, m_off, m_sz, align, lvl + 1);
@ -870,8 +842,8 @@ static void btf_dump_emit_enum_def(struct btf_dump *d, __u32 id,
const struct btf_type *t,
int lvl)
{
const struct btf_enum *v = (void *)(t+1);
__u16 vlen = btf_vlen_of(t);
const struct btf_enum *v = btf_enum(t);
__u16 vlen = btf_vlen(t);
const char *name;
size_t dup_cnt;
int i;
@ -905,7 +877,7 @@ static void btf_dump_emit_fwd_def(struct btf_dump *d, __u32 id,
{
const char *name = btf_dump_type_name(d, id);
if (btf_kflag_of(t))
if (btf_kflag(t))
btf_dump_printf(d, "union %s", name);
else
btf_dump_printf(d, "struct %s", name);
@ -987,7 +959,6 @@ static void btf_dump_emit_type_decl(struct btf_dump *d, __u32 id,
struct id_stack decl_stack;
const struct btf_type *t;
int err, stack_start;
__u16 kind;
stack_start = d->decl_stack_cnt;
for (;;) {
@ -1008,8 +979,7 @@ static void btf_dump_emit_type_decl(struct btf_dump *d, __u32 id,
break;
t = btf__type_by_id(d->btf, id);
kind = btf_kind_of(t);
switch (kind) {
switch (btf_kind(t)) {
case BTF_KIND_PTR:
case BTF_KIND_VOLATILE:
case BTF_KIND_CONST:
@ -1017,12 +987,9 @@ static void btf_dump_emit_type_decl(struct btf_dump *d, __u32 id,
case BTF_KIND_FUNC_PROTO:
id = t->type;
break;
case BTF_KIND_ARRAY: {
const struct btf_array *a = (void *)(t + 1);
id = a->type;
case BTF_KIND_ARRAY:
id = btf_array(t)->type;
break;
}
case BTF_KIND_INT:
case BTF_KIND_ENUM:
case BTF_KIND_FWD:
@ -1032,7 +999,7 @@ static void btf_dump_emit_type_decl(struct btf_dump *d, __u32 id,
goto done;
default:
pr_warning("unexpected type in decl chain, kind:%u, id:[%u]\n",
kind, id);
btf_kind(t), id);
goto done;
}
}
@ -1070,7 +1037,7 @@ static void btf_dump_emit_mods(struct btf_dump *d, struct id_stack *decl_stack)
id = decl_stack->ids[decl_stack->cnt - 1];
t = btf__type_by_id(d->btf, id);
switch (btf_kind_of(t)) {
switch (btf_kind(t)) {
case BTF_KIND_VOLATILE:
btf_dump_printf(d, "volatile ");
break;
@ -1087,20 +1054,6 @@ static void btf_dump_emit_mods(struct btf_dump *d, struct id_stack *decl_stack)
}
}
static bool btf_is_mod_kind(const struct btf *btf, __u32 id)
{
const struct btf_type *t = btf__type_by_id(btf, id);
switch (btf_kind_of(t)) {
case BTF_KIND_VOLATILE:
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
return true;
default:
return false;
}
}
static void btf_dump_emit_name(const struct btf_dump *d,
const char *name, bool last_was_ptr)
{
@ -1139,7 +1092,7 @@ static void btf_dump_emit_type_chain(struct btf_dump *d,
}
t = btf__type_by_id(d->btf, id);
kind = btf_kind_of(t);
kind = btf_kind(t);
switch (kind) {
case BTF_KIND_INT:
@ -1185,7 +1138,7 @@ static void btf_dump_emit_type_chain(struct btf_dump *d,
btf_dump_printf(d, " restrict");
break;
case BTF_KIND_ARRAY: {
const struct btf_array *a = (void *)(t + 1);
const struct btf_array *a = btf_array(t);
const struct btf_type *next_t;
__u32 next_id;
bool multidim;
@ -1201,7 +1154,8 @@ static void btf_dump_emit_type_chain(struct btf_dump *d,
*/
while (decls->cnt) {
next_id = decls->ids[decls->cnt - 1];
if (btf_is_mod_kind(d->btf, next_id))
next_t = btf__type_by_id(d->btf, next_id);
if (btf_is_mod(next_t))
decls->cnt--;
else
break;
@ -1214,7 +1168,7 @@ static void btf_dump_emit_type_chain(struct btf_dump *d,
}
next_t = btf__type_by_id(d->btf, next_id);
multidim = btf_kind_of(next_t) == BTF_KIND_ARRAY;
multidim = btf_is_array(next_t);
/* we need space if we have named non-pointer */
if (fname[0] && !last_was_ptr)
btf_dump_printf(d, " ");
@ -1228,8 +1182,8 @@ static void btf_dump_emit_type_chain(struct btf_dump *d,
return;
}
case BTF_KIND_FUNC_PROTO: {
const struct btf_param *p = (void *)(t + 1);
__u16 vlen = btf_vlen_of(t);
const struct btf_param *p = btf_params(t);
__u16 vlen = btf_vlen(t);
int i;
btf_dump_emit_mods(d, decls);

60
tools/lib/bpf/libbpf.c
View File

@ -1049,9 +1049,9 @@ static bool get_map_field_int(const char *map_name, const struct btf *btf,
const struct btf_array *arr_info;
const struct btf_type *arr_t;
if (BTF_INFO_KIND(t->info) != BTF_KIND_PTR) {
if (!btf_is_ptr(t)) {
pr_warning("map '%s': attr '%s': expected PTR, got %u.\n",
map_name, name, BTF_INFO_KIND(t->info));
map_name, name, btf_kind(t));
return false;
}
@ -1061,12 +1061,12 @@ static bool get_map_field_int(const char *map_name, const struct btf *btf,
map_name, name, t->type);
return false;
}
if (BTF_INFO_KIND(arr_t->info) != BTF_KIND_ARRAY) {
if (!btf_is_array(arr_t)) {
pr_warning("map '%s': attr '%s': expected ARRAY, got %u.\n",
map_name, name, BTF_INFO_KIND(arr_t->info));
map_name, name, btf_kind(arr_t));
return false;
}
arr_info = (const void *)(arr_t + 1);
arr_info = btf_array(arr_t);
*res = arr_info->nelems;
return true;
}
@ -1084,11 +1084,11 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
struct bpf_map *map;
int vlen, i;
vi = (const struct btf_var_secinfo *)(const void *)(sec + 1) + var_idx;
vi = btf_var_secinfos(sec) + var_idx;
var = btf__type_by_id(obj->btf, vi->type);
var_extra = (const void *)(var + 1);
var_extra = btf_var(var);
map_name = btf__name_by_offset(obj->btf, var->name_off);
vlen = BTF_INFO_VLEN(var->info);
vlen = btf_vlen(var);
if (map_name == NULL || map_name[0] == '\0') {
pr_warning("map #%d: empty name.\n", var_idx);
@ -1098,9 +1098,9 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
pr_warning("map '%s' BTF data is corrupted.\n", map_name);
return -EINVAL;
}
if (BTF_INFO_KIND(var->info) != BTF_KIND_VAR) {
if (!btf_is_var(var)) {
pr_warning("map '%s': unexpected var kind %u.\n",
map_name, BTF_INFO_KIND(var->info));
map_name, btf_kind(var));
return -EINVAL;
}
if (var_extra->linkage != BTF_VAR_GLOBAL_ALLOCATED &&
@ -1111,9 +1111,9 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
}
def = skip_mods_and_typedefs(obj->btf, var->type);
if (BTF_INFO_KIND(def->info) != BTF_KIND_STRUCT) {
if (!btf_is_struct(def)) {
pr_warning("map '%s': unexpected def kind %u.\n",
map_name, BTF_INFO_KIND(var->info));
map_name, btf_kind(var));
return -EINVAL;
}
if (def->size > vi->size) {
@ -1136,8 +1136,8 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
pr_debug("map '%s': at sec_idx %d, offset %zu.\n",
map_name, map->sec_idx, map->sec_offset);
vlen = BTF_INFO_VLEN(def->info);
m = (const void *)(def + 1);
vlen = btf_vlen(def);
m = btf_members(def);
for (i = 0; i < vlen; i++, m++) {
const char *name = btf__name_by_offset(obj->btf, m->name_off);
@ -1187,9 +1187,9 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
map_name, m->type);
return -EINVAL;
}
if (BTF_INFO_KIND(t->info) != BTF_KIND_PTR) {
if (!btf_is_ptr(t)) {
pr_warning("map '%s': key spec is not PTR: %u.\n",
map_name, BTF_INFO_KIND(t->info));
map_name, btf_kind(t));
return -EINVAL;
}
sz = btf__resolve_size(obj->btf, t->type);
@ -1230,9 +1230,9 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
map_name, m->type);
return -EINVAL;
}
if (BTF_INFO_KIND(t->info) != BTF_KIND_PTR) {
if (!btf_is_ptr(t)) {
pr_warning("map '%s': value spec is not PTR: %u.\n",
map_name, BTF_INFO_KIND(t->info));
map_name, btf_kind(t));
return -EINVAL;
}
sz = btf__resolve_size(obj->btf, t->type);
@ -1293,7 +1293,7 @@ static int bpf_object__init_user_btf_maps(struct bpf_object *obj, bool strict)
nr_types = btf__get_nr_types(obj->btf);
for (i = 1; i <= nr_types; i++) {
t = btf__type_by_id(obj->btf, i);
if (BTF_INFO_KIND(t->info) != BTF_KIND_DATASEC)
if (!btf_is_datasec(t))
continue;
name = btf__name_by_offset(obj->btf, t->name_off);
if (strcmp(name, MAPS_ELF_SEC) == 0) {
@ -1307,7 +1307,7 @@ static int bpf_object__init_user_btf_maps(struct bpf_object *obj, bool strict)
return -ENOENT;
}
vlen = BTF_INFO_VLEN(sec->info);
vlen = btf_vlen(sec);
for (i = 0; i < vlen; i++) {
err = bpf_object__init_user_btf_map(obj, sec, i,
obj->efile.btf_maps_shndx,
@ -1368,24 +1368,22 @@ static void bpf_object__sanitize_btf(struct bpf_object *obj)
struct btf *btf = obj->btf;
struct btf_type *t;
int i, j, vlen;
__u16 kind;
if (!obj->btf || (has_func && has_datasec))
return;
for (i = 1; i <= btf__get_nr_types(btf); i++) {
t = (struct btf_type *)btf__type_by_id(btf, i);
kind = BTF_INFO_KIND(t->info);
if (!has_datasec && kind == BTF_KIND_VAR) {
if (!has_datasec && btf_is_var(t)) {
/* replace VAR with INT */
t->info = BTF_INFO_ENC(BTF_KIND_INT, 0, 0);
t->size = sizeof(int);
*(int *)(t+1) = BTF_INT_ENC(0, 0, 32);
} else if (!has_datasec && kind == BTF_KIND_DATASEC) {
*(int *)(t + 1) = BTF_INT_ENC(0, 0, 32);
} else if (!has_datasec && btf_is_datasec(t)) {
/* replace DATASEC with STRUCT */
struct btf_var_secinfo *v = (void *)(t + 1);
struct btf_member *m = (void *)(t + 1);
const struct btf_var_secinfo *v = btf_var_secinfos(t);
struct btf_member *m = btf_members(t);
struct btf_type *vt;
char *name;
@ -1396,7 +1394,7 @@ static void bpf_object__sanitize_btf(struct bpf_object *obj)
name++;
}
vlen = BTF_INFO_VLEN(t->info);
vlen = btf_vlen(t);
t->info = BTF_INFO_ENC(BTF_KIND_STRUCT, 0, vlen);
for (j = 0; j < vlen; j++, v++, m++) {
/* order of field assignments is important */
@ -1406,12 +1404,12 @@ static void bpf_object__sanitize_btf(struct bpf_object *obj)
vt = (void *)btf__type_by_id(btf, v->type);
m->name_off = vt->name_off;
}
} else if (!has_func && kind == BTF_KIND_FUNC_PROTO) {
} else if (!has_func && btf_is_func_proto(t)) {
/* replace FUNC_PROTO with ENUM */
vlen = BTF_INFO_VLEN(t->info);
vlen = btf_vlen(t);
t->info = BTF_INFO_ENC(BTF_KIND_ENUM, 0, vlen);
t->size = sizeof(__u32); /* kernel enforced */
} else if (!has_func && kind == BTF_KIND_FUNC) {
} else if (!has_func && btf_is_func(t)) {
/* replace FUNC with TYPEDEF */
t->info = BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0);
}