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selftests/bpf: Test new btf__add_btf() API

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Add a test that validates that btf__add_btf() API is correctly copying
all the types from the source BTF into destination BTF object and
adjusts type IDs and string offsets properly.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211006051107.17921-4-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-10-05 22:11:07 -07:00 committed by Daniel Borkmann
parent c65eb8082d
commit 9d05787223
1 changed files with 86 additions and 0 deletions
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86
tools/testing/selftests/bpf/prog_tests/btf_write.c
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@ -342,8 +342,94 @@ static void test_btf_add()
btf__free(btf);
}
static void test_btf_add_btf()
{
struct btf *btf1 = NULL, *btf2 = NULL;
int id;
btf1 = btf__new_empty();
if (!ASSERT_OK_PTR(btf1, "btf1"))
return;
btf2 = btf__new_empty();
if (!ASSERT_OK_PTR(btf2, "btf2"))
goto cleanup;
gen_btf(btf1);
gen_btf(btf2);
id = btf__add_btf(btf1, btf2);
if (!ASSERT_EQ(id, 20, "id"))
goto cleanup;
VALIDATE_RAW_BTF(
btf1,
"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[2] PTR '(anon)' type_id=1",
"[3] CONST '(anon)' type_id=5",
"[4] VOLATILE '(anon)' type_id=3",
"[5] RESTRICT '(anon)' type_id=4",
"[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
"[7] STRUCT 's1' size=8 vlen=2\n"
"\t'f1' type_id=1 bits_offset=0\n"
"\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
"[8] UNION 'u1' size=8 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
"[9] ENUM 'e1' size=4 vlen=2\n"
"\t'v1' val=1\n"
"\t'v2' val=2",
"[10] FWD 'struct_fwd' fwd_kind=struct",
"[11] FWD 'union_fwd' fwd_kind=union",
"[12] ENUM 'enum_fwd' size=4 vlen=0",
"[13] TYPEDEF 'typedef1' type_id=1",
"[14] FUNC 'func1' type_id=15 linkage=global",
"[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
"\t'p1' type_id=1\n"
"\t'p2' type_id=2",
"[16] VAR 'var1' type_id=1, linkage=global-alloc",
"[17] DATASEC 'datasec1' size=12 vlen=1\n"
"\ttype_id=1 offset=4 size=8",
"[18] TAG 'tag1' type_id=16 component_idx=-1",
"[19] TAG 'tag2' type_id=14 component_idx=1",
/* types appended from the second BTF */
"[20] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[21] PTR '(anon)' type_id=20",
"[22] CONST '(anon)' type_id=24",
"[23] VOLATILE '(anon)' type_id=22",
"[24] RESTRICT '(anon)' type_id=23",
"[25] ARRAY '(anon)' type_id=21 index_type_id=20 nr_elems=10",
"[26] STRUCT 's1' size=8 vlen=2\n"
"\t'f1' type_id=20 bits_offset=0\n"
"\t'f2' type_id=20 bits_offset=32 bitfield_size=16",
"[27] UNION 'u1' size=8 vlen=1\n"
"\t'f1' type_id=20 bits_offset=0 bitfield_size=16",
"[28] ENUM 'e1' size=4 vlen=2\n"
"\t'v1' val=1\n"
"\t'v2' val=2",
"[29] FWD 'struct_fwd' fwd_kind=struct",
"[30] FWD 'union_fwd' fwd_kind=union",
"[31] ENUM 'enum_fwd' size=4 vlen=0",
"[32] TYPEDEF 'typedef1' type_id=20",
"[33] FUNC 'func1' type_id=34 linkage=global",
"[34] FUNC_PROTO '(anon)' ret_type_id=20 vlen=2\n"
"\t'p1' type_id=20\n"
"\t'p2' type_id=21",
"[35] VAR 'var1' type_id=20, linkage=global-alloc",
"[36] DATASEC 'datasec1' size=12 vlen=1\n"
"\ttype_id=20 offset=4 size=8",
"[37] TAG 'tag1' type_id=35 component_idx=-1",
"[38] TAG 'tag2' type_id=33 component_idx=1");
cleanup:
btf__free(btf1);
btf__free(btf2);
}
void test_btf_write()
{
if (test__start_subtest("btf_add"))
test_btf_add();
if (test__start_subtest("btf_add_btf"))
test_btf_add_btf();
}