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selftests/bpf: Test multi-split BTF 

Extend split BTF test to cover case where we create split BTF on top of
existing split BTF and add info to it; ensure that such BTF can be
created and handled by searching within it, dumping/comparing to expected.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250519165935.261614-3-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire 2025-05-19 17:59:35 +01:00 committed by Andrii Nakryiko
parent 4e29128a9a
commit 02f5e7c1f3
1 changed files with 52 additions and 6 deletions
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58
tools/testing/selftests/bpf/prog_tests/btf_split.c
View File

@ -12,10 +12,11 @@ static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
vfprintf(ctx, fmt, args);
}
void test_btf_split() {
static void __test_btf_split(bool multi)
{
struct btf_dump *d = NULL;
const struct btf_type *t;
struct btf *btf1, *btf2;
struct btf *btf1, *btf2, *btf3 = NULL;
int str_off, i, err;
btf1 = btf__new_empty();
@ -63,14 +64,46 @@ void test_btf_split() {
ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen");
ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name");
if (multi) {
btf3 = btf__new_empty_split(btf2);
if (!ASSERT_OK_PTR(btf3, "multi_split_btf"))
goto cleanup;
} else {
btf3 = btf2;
}
btf__add_union(btf3, "u1", 16); /* [5] union u1 { */
btf__add_field(btf3, "f1", 4, 0, 0); /* struct s2 f1; */
btf__add_field(btf3, "uf2", 1, 0, 0); /* int f2; */
/* } */
if (multi) {
t = btf__type_by_id(btf2, 5);
ASSERT_NULL(t, "multisplit_type_in_first_split");
}
t = btf__type_by_id(btf3, 5);
if (!ASSERT_OK_PTR(t, "split_union_type"))
goto cleanup;
ASSERT_EQ(btf_is_union(t), true, "split_union_kind");
ASSERT_EQ(btf_vlen(t), 2, "split_union_vlen");
ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "u1", "split_union_name");
ASSERT_EQ(btf__type_cnt(btf3), 6, "split_type_cnt");
t = btf__type_by_id(btf3, 1);
if (!ASSERT_OK_PTR(t, "split_base_type"))
goto cleanup;
ASSERT_EQ(btf_is_int(t), true, "split_base_int");
ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "int", "split_base_type_name");
/* BTF-to-C dump of split BTF */
dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
return;
d = btf_dump__new(btf2, btf_dump_printf, dump_buf_file, NULL);
d = btf_dump__new(btf3, btf_dump_printf, dump_buf_file, NULL);
if (!ASSERT_OK_PTR(d, "btf_dump__new"))
goto cleanup;
for (i = 1; i < btf__type_cnt(btf2); i++) {
for (i = 1; i < btf__type_cnt(btf3); i++) {
err = btf_dump__dump_type(d, i);
ASSERT_OK(err, "dump_type_ok");
}
@ -79,12 +112,15 @@ void test_btf_split() {
ASSERT_STREQ(dump_buf,
"struct s1 {\n"
" int f1;\n"
"};\n"
"\n"
"};\n\n"
"struct s2 {\n"
" struct s1 f1;\n"
" int f2;\n"
" int *f3;\n"
"};\n\n"
"union u1 {\n"
" struct s2 f1;\n"
" int uf2;\n"
"};\n\n", "c_dump");
cleanup:
@ -94,4 +130,14 @@ cleanup:
btf_dump__free(d);
btf__free(btf1);
btf__free(btf2);
if (btf2 != btf3)
btf__free(btf3);
}
void test_btf_split(void)
{
if (test__start_subtest("single_split"))
__test_btf_split(false);
if (test__start_subtest("multi_split"))
__test_btf_split(true);
}