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selftests/bpf: Tests for btf_dedup_resolve_fwds 

Tests to verify the following behavior of `btf_dedup_resolve_fwds`:
- remapping for struct forward declarations;
- remapping for union forward declarations;
- no remapping if forward declaration kind does not match similarly
  named struct or union declaration;
- no remapping if forward declaration name is ambiguous;
- base ids are considered for fwd resolution in split btf scenario.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Link: https://lore.kernel.org/bpf/20221109142611.879983-4-eddyz87@gmail.com
This commit is contained in:
Eduard Zingerman 2022-11-09 16:26:11 +02:00 committed by Andrii Nakryiko
parent 082108fd69
commit 99e18fad5f
2 changed files with 206 additions and 15 deletions
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176
tools/testing/selftests/bpf/prog_tests/btf.c
View File

@ -7690,6 +7690,182 @@ static struct btf_dedup_test dedup_tests[] = {
BTF_STR_SEC("\0e1\0e1_val\0td"),
},
},
{
.descr = "dedup: standalone fwd declaration struct",
/*
* Verify that CU1:foo and CU2:foo would be unified and that
* typedef/ptr would be updated to point to CU1:foo.
*
* // CU 1:
* struct foo { int x; };
*
* // CU 2:
* struct foo;
* typedef struct foo *foo_ptr;
*/
.input = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
/* CU 2 */
BTF_FWD_ENC(NAME_NTH(1), 0), /* [3] */
BTF_PTR_ENC(3), /* [4] */
BTF_TYPEDEF_ENC(NAME_NTH(3), 4), /* [5] */
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0foo_ptr"),
},
.expect = {
.raw_types = {
BTF_STRUCT_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
BTF_PTR_ENC(1), /* [3] */
BTF_TYPEDEF_ENC(NAME_NTH(3), 3), /* [4] */
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0foo_ptr"),
},
},
{
.descr = "dedup: standalone fwd declaration union",
/*
* Verify that CU1:foo and CU2:foo would be unified and that
* typedef/ptr would be updated to point to CU1:foo.
* Same as "dedup: standalone fwd declaration struct" but for unions.
*
* // CU 1:
* union foo { int x; };
*
* // CU 2:
* union foo;
* typedef union foo *foo_ptr;
*/
.input = {
.raw_types = {
/* CU 1 */
BTF_UNION_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
/* CU 2 */
BTF_FWD_ENC(NAME_TBD, 1), /* [3] */
BTF_PTR_ENC(3), /* [4] */
BTF_TYPEDEF_ENC(NAME_NTH(3), 4), /* [5] */
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0foo_ptr"),
},
.expect = {
.raw_types = {
BTF_UNION_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
BTF_PTR_ENC(1), /* [3] */
BTF_TYPEDEF_ENC(NAME_NTH(3), 3), /* [4] */
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0foo_ptr"),
},
},
{
.descr = "dedup: standalone fwd declaration wrong kind",
/*
* Negative test for btf_dedup_resolve_fwds:
* - CU1:foo is a struct, C2:foo is a union, thus CU2:foo is not deduped;
* - typedef/ptr should remain unchanged as well.
*
* // CU 1:
* struct foo { int x; };
*
* // CU 2:
* union foo;
* typedef union foo *foo_ptr;
*/
.input = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
/* CU 2 */
BTF_FWD_ENC(NAME_NTH(3), 1), /* [3] */
BTF_PTR_ENC(3), /* [4] */
BTF_TYPEDEF_ENC(NAME_NTH(3), 4), /* [5] */
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0foo_ptr"),
},
.expect = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
/* CU 2 */
BTF_FWD_ENC(NAME_NTH(3), 1), /* [3] */
BTF_PTR_ENC(3), /* [4] */
BTF_TYPEDEF_ENC(NAME_NTH(3), 4), /* [5] */
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0foo_ptr"),
},
},
{
.descr = "dedup: standalone fwd declaration name conflict",
/*
* Negative test for btf_dedup_resolve_fwds:
* - two candidates for CU2:foo dedup, thus it is unchanged;
* - typedef/ptr should remain unchanged as well.
*
* // CU 1:
* struct foo { int x; };
*
* // CU 2:
* struct foo;
* typedef struct foo *foo_ptr;
*
* // CU 3:
* struct foo { int x; int y; };
*/
.input = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
/* CU 2 */
BTF_FWD_ENC(NAME_NTH(1), 0), /* [3] */
BTF_PTR_ENC(3), /* [4] */
BTF_TYPEDEF_ENC(NAME_NTH(4), 4), /* [5] */
/* CU 3 */
BTF_STRUCT_ENC(NAME_NTH(1), 2, 8), /* [6] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_MEMBER_ENC(NAME_NTH(3), 2, 0),
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0y\0foo_ptr"),
},
.expect = {
.raw_types = {
/* CU 1 */
BTF_STRUCT_ENC(NAME_NTH(1), 1, 4), /* [1] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [2] */
/* CU 2 */
BTF_FWD_ENC(NAME_NTH(1), 0), /* [3] */
BTF_PTR_ENC(3), /* [4] */
BTF_TYPEDEF_ENC(NAME_NTH(4), 4), /* [5] */
/* CU 3 */
BTF_STRUCT_ENC(NAME_NTH(1), 2, 8), /* [6] */
BTF_MEMBER_ENC(NAME_NTH(2), 2, 0),
BTF_MEMBER_ENC(NAME_NTH(3), 2, 0),
BTF_END_RAW,
},
BTF_STR_SEC("\0foo\0x\0y\0foo_ptr"),
},
},
};
static int btf_type_size(const struct btf_type *t)

45
tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
View File

@ -141,6 +141,10 @@ static void test_split_fwd_resolve() {
btf__add_field(btf1, "f2", 3, 64, 0); /* struct s2 *f2; */
/* } */
btf__add_struct(btf1, "s2", 4); /* [5] struct s2 { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
/* keep this not a part of type the graph to test btf_dedup_resolve_fwds */
btf__add_struct(btf1, "s3", 4); /* [6] struct s3 { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
@ -153,20 +157,24 @@ static void test_split_fwd_resolve() {
"\t'f1' type_id=2 bits_offset=0\n"
"\t'f2' type_id=3 bits_offset=64",
"[5] STRUCT 's2' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[6] STRUCT 's3' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0");
btf2 = btf__new_empty_split(btf1);
if (!ASSERT_OK_PTR(btf2, "empty_split_btf"))
goto cleanup;
btf__add_int(btf2, "int", 4, BTF_INT_SIGNED); /* [6] int */
btf__add_ptr(btf2, 10); /* [7] ptr to struct s1 */
btf__add_fwd(btf2, "s2", BTF_FWD_STRUCT); /* [8] fwd for struct s2 */
btf__add_ptr(btf2, 8); /* [9] ptr to fwd struct s2 */
btf__add_struct(btf2, "s1", 16); /* [10] struct s1 { */
btf__add_field(btf2, "f1", 7, 0, 0); /* struct s1 *f1; */
btf__add_field(btf2, "f2", 9, 64, 0); /* struct s2 *f2; */
btf__add_int(btf2, "int", 4, BTF_INT_SIGNED); /* [7] int */
btf__add_ptr(btf2, 11); /* [8] ptr to struct s1 */
btf__add_fwd(btf2, "s2", BTF_FWD_STRUCT); /* [9] fwd for struct s2 */
btf__add_ptr(btf2, 9); /* [10] ptr to fwd struct s2 */
btf__add_struct(btf2, "s1", 16); /* [11] struct s1 { */
btf__add_field(btf2, "f1", 8, 0, 0); /* struct s1 *f1; */
btf__add_field(btf2, "f2", 10, 64, 0); /* struct s2 *f2; */
/* } */
btf__add_fwd(btf2, "s3", BTF_FWD_STRUCT); /* [12] fwd for struct s3 */
btf__add_ptr(btf2, 12); /* [13] ptr to struct s1 */
VALIDATE_RAW_BTF(
btf2,
@ -178,13 +186,17 @@ static void test_split_fwd_resolve() {
"\t'f2' type_id=3 bits_offset=64",
"[5] STRUCT 's2' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[6] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[7] PTR '(anon)' type_id=10",
"[8] FWD 's2' fwd_kind=struct",
"[9] PTR '(anon)' type_id=8",
"[10] STRUCT 's1' size=16 vlen=2\n"
"\t'f1' type_id=7 bits_offset=0\n"
"\t'f2' type_id=9 bits_offset=64");
"[6] STRUCT 's3' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[7] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[8] PTR '(anon)' type_id=11",
"[9] FWD 's2' fwd_kind=struct",
"[10] PTR '(anon)' type_id=9",
"[11] STRUCT 's1' size=16 vlen=2\n"
"\t'f1' type_id=8 bits_offset=0\n"
"\t'f2' type_id=10 bits_offset=64",
"[12] FWD 's3' fwd_kind=struct",
"[13] PTR '(anon)' type_id=12");
err = btf__dedup(btf2, NULL);
if (!ASSERT_OK(err, "btf_dedup"))
@ -199,7 +211,10 @@ static void test_split_fwd_resolve() {
"\t'f1' type_id=2 bits_offset=0\n"
"\t'f2' type_id=3 bits_offset=64",
"[5] STRUCT 's2' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0");
"\t'f1' type_id=1 bits_offset=0",
"[6] STRUCT 's3' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[7] PTR '(anon)' type_id=6");
cleanup:
btf__free(btf2);