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selftests/bpf: Tests for enum fwd resolved as full enum64 

A set of test cases to verify enum fwd resolution logic:
- verify that enum fwd can be resolved as full enum64;
- verify that enum64 fwd can be resolved as full enum;
- verify that enum size is considered when enums are compared for
  equivalence.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221101235413.1824260-2-eddyz87@gmail.com
This commit is contained in:
Eduard Zingerman 2022-11-02 01:54:13 +02:00 committed by Andrii Nakryiko
parent de048b6ee8
commit 2e20f50ff8
1 changed files with 83 additions and 5 deletions
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88
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -7133,7 +7133,7 @@ static struct btf_dedup_test dedup_tests[] = {
BTF_ENUM_ENC(NAME_NTH(4), 456),
/* [4] fwd enum 'e2' after full enum */
BTF_TYPE_ENC(NAME_NTH(3), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 0), 4),
/* [5] incompatible fwd enum with different size */
/* [5] fwd enum with different size, size does not matter for fwd */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 0), 1),
/* [6] incompatible full enum with different value */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
@ -7150,9 +7150,7 @@ static struct btf_dedup_test dedup_tests[] = {
/* [2] full enum 'e2' */
BTF_TYPE_ENC(NAME_NTH(3), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
BTF_ENUM_ENC(NAME_NTH(4), 456),
/* [3] incompatible fwd enum with different size */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 0), 1),
/* [4] incompatible full enum with different value */
/* [3] incompatible full enum with different value */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
BTF_ENUM_ENC(NAME_NTH(2), 321),
BTF_END_RAW,
@ -7611,7 +7609,87 @@ static struct btf_dedup_test dedup_tests[] = {
BTF_STR_SEC("\0e1\0e1_val"),
},
},
{
.descr = "dedup: enum of different size: no dedup",
.input = {
.raw_types = {
/* [1] enum 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
BTF_ENUM_ENC(NAME_NTH(2), 1),
/* [2] enum 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 2),
BTF_ENUM_ENC(NAME_NTH(2), 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0e1\0e1_val"),
},
.expect = {
.raw_types = {
/* [1] enum 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
BTF_ENUM_ENC(NAME_NTH(2), 1),
/* [2] enum 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 2),
BTF_ENUM_ENC(NAME_NTH(2), 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0e1\0e1_val"),
},
},
{
.descr = "dedup: enum fwd to enum64",
.input = {
.raw_types = {
/* [1] enum64 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM64, 0, 1), 8),
BTF_ENUM64_ENC(NAME_NTH(2), 1, 0),
/* [2] enum 'e1' fwd */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 0), 4),
/* [3] typedef enum 'e1' td */
BTF_TYPE_ENC(NAME_NTH(3), BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0), 2),
BTF_END_RAW,
},
BTF_STR_SEC("\0e1\0e1_val\0td"),
},
.expect = {
.raw_types = {
/* [1] enum64 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM64, 0, 1), 8),
BTF_ENUM64_ENC(NAME_NTH(2), 1, 0),
/* [2] typedef enum 'e1' td */
BTF_TYPE_ENC(NAME_NTH(3), BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0), 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0e1\0e1_val\0td"),
},
},
{
.descr = "dedup: enum64 fwd to enum",
.input = {
.raw_types = {
/* [1] enum 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
BTF_ENUM_ENC(NAME_NTH(2), 1),
/* [2] enum64 'e1' fwd */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM64, 0, 0), 8),
/* [3] typedef enum 'e1' td */
BTF_TYPE_ENC(NAME_NTH(3), BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0), 2),
BTF_END_RAW,
},
BTF_STR_SEC("\0e1\0e1_val\0td"),
},
.expect = {
.raw_types = {
/* [1] enum 'e1' */
BTF_TYPE_ENC(NAME_NTH(1), BTF_INFO_ENC(BTF_KIND_ENUM, 0, 1), 4),
BTF_ENUM_ENC(NAME_NTH(2), 1),
/* [2] typedef enum 'e1' td */
BTF_TYPE_ENC(NAME_NTH(3), BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0), 1),
BTF_END_RAW,
},
BTF_STR_SEC("\0e1\0e1_val\0td"),
},
},
};
static int btf_type_size(const struct btf_type *t)