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selftests/bpf: add btf_dedup test for VOID equivalence check

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This patch adds specific test exposing bug in btf_dedup_is_equiv() when
comparing candidate VOID type to a non-VOID canonical type. It's
important for canonical type to be anonymous, otherwise name equality
check will do the right thing and will exit early.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-03-26 22:00:07 -07:00 committed by Alexei Starovoitov
parent 9ec71c1cdb
commit eb76899ce7
1 changed files with 47 additions and 0 deletions
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47
tools/testing/selftests/bpf/test_btf.c
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@ -5776,6 +5776,53 @@ const struct btf_dedup_test dedup_tests[] = {
.dedup_table_size = 1, /* force hash collisions */
},
},
{
.descr = "dedup: void equiv check",
/*
* // CU 1:
* struct s {
* struct {} *x;
* };
* // CU 2:
* struct s {
* int *x;
* };
*/
.input = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(0, 0, 1), /* [1] struct {} */
BTF_PTR_ENC(1), /* [2] ptr -> [1] */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 8), /* [3] struct s */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
/* CU 2 */
BTF_PTR_ENC(0), /* [4] ptr -> void */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 8), /* [5] struct s */
BTF_MEMBER_ENC(NAME_NTH(2), 4, 0),
BTF_END_RAW,
},
BTF_STR_SEC("\0s\0x"),
},
.expect = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(0, 0, 1), /* [1] struct {} */
BTF_PTR_ENC(1), /* [2] ptr -> [1] */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 8), /* [3] struct s */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
/* CU 2 */
BTF_PTR_ENC(0), /* [4] ptr -> void */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 8), /* [5] struct s */
BTF_MEMBER_ENC(NAME_NTH(2), 4, 0),
BTF_END_RAW,
},
BTF_STR_SEC("\0s\0x"),
},
.opts = {
.dont_resolve_fwds = false,
.dedup_table_size = 1, /* force hash collisions */
},
},
{
.descr = "dedup: all possible kinds (no duplicates)",
.input = {