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Tue, 18 Nov 2025 19:21:45 -0800 (PST) From: Donglin Peng To: ast@kernel.org, andrii.nakryiko@gmail.com Cc: eddyz87@gmail.com, zhangxiaoqin@xiaomi.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Donglin Peng , Alan Maguire , Song Liu Subject: [RFC PATCH v7 2/7] selftests/bpf: Add test cases for btf__permute functionality Date: Wed, 19 Nov 2025 11:15:26 +0800 Message-Id: <20251119031531.1817099-3-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251119031531.1817099-1-dolinux.peng@gmail.com> References: <20251119031531.1817099-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Donglin Peng This patch introduces test cases for the btf__permute function to ensure it works correctly with both base BTF and split BTF scenarios. The test suite includes: - test_permute_base: Validates permutation on base BTF - test_permute_split: Tests permutation on split BTF - test_permute_drop_base: Validates type dropping on base BTF - test_permute_drop_split: Tests type dropping on split BTF - test_permute_drop_dedup: Tests type dropping and deduping Cc: Eduard Zingerman Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Alan Maguire Cc: Song Liu Cc: Xiaoqin Zhang Signed-off-by: Donglin Peng --- .../selftests/bpf/prog_tests/btf_permute.c | 608 ++++++++++++++++++ 1 file changed, 608 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/btf_permute.c diff --git a/tools/testing/selftests/bpf/prog_tests/btf_permute.c b/tools/t= esting/selftests/bpf/prog_tests/btf_permute.c new file mode 100644 index 000000000000..f67bf89519b3 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/btf_permute.c @@ -0,0 +1,608 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 Xiaomi */ + +#include +#include +#include "btf_helpers.h" + +/* Ensure btf__permute work as expected with base BTF */ +static void test_permute_base(void) +{ + struct btf *btf; + __u32 permute_ids[6]; + int start_id =3D 1; + int err; + + btf =3D btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_main_btf")) + return; + + btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(btf, 1); /* [2] ptr to int */ + btf__add_struct(btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(btf, 1); /* [5] int (*)(int *p); */ + btf__add_func_param(btf, "p", 2); + btf__add_func(btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */ + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] FUNC 'f' type_id=3D5 linkage=3Dstatic"); + + permute_ids[1 - start_id] =3D 4; /* [1] -> [4] */ + permute_ids[2 - start_id] =3D 3; /* [2] -> [3] */ + permute_ids[3 - start_id] =3D 5; /* [3] -> [5] */ + permute_ids[4 - start_id] =3D 1; /* [4] -> [1] */ + permute_ids[5 - start_id] =3D 6; /* [5] -> [6] */ + permute_ids[6 - start_id] =3D 2; /* [6] -> [2] */ + err =3D btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[2] FUNC 'f' type_id=3D6 linkage=3Dstatic", + "[3] PTR '(anon)' type_id=3D4", + "[4] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[5] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[6] FUNC_PROTO '(anon)' ret_type_id=3D4 vlen=3D1\n" + "\t'p' type_id=3D3"); + + /* + * For base BTF, id_map_cnt must equal to the number of types + * include VOID type + */ + permute_ids[1 - start_id] =3D 4; /* [1] -> [4] */ + permute_ids[2 - start_id] =3D 3; /* [2] -> [3] */ + permute_ids[3 - start_id] =3D 5; /* [3] -> [5] */ + permute_ids[4 - start_id] =3D 1; /* [4] -> [1] */ + permute_ids[5 - start_id] =3D 6; /* [5] -> [6] */ + permute_ids[6 - start_id] =3D 2; /* [6] -> [2] */ + err =3D btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids) - 1, NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[2] FUNC 'f' type_id=3D6 linkage=3Dstatic", + "[3] PTR '(anon)' type_id=3D4", + "[4] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[5] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[6] FUNC_PROTO '(anon)' ret_type_id=3D4 vlen=3D1\n" + "\t'p' type_id=3D3"); + + /* Multiple types can not be mapped to the same ID */ + permute_ids[1 - start_id] =3D 4; + permute_ids[2 - start_id] =3D 4; + permute_ids[3 - start_id] =3D 5; + permute_ids[4 - start_id] =3D 1; + permute_ids[5 - start_id] =3D 6; + permute_ids[6 - start_id] =3D 2; + err =3D btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[2] FUNC 'f' type_id=3D6 linkage=3Dstatic", + "[3] PTR '(anon)' type_id=3D4", + "[4] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[5] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[6] FUNC_PROTO '(anon)' ret_type_id=3D4 vlen=3D1\n" + "\t'p' type_id=3D3"); + + /* Type ID must be valid */ + permute_ids[1 - start_id] =3D 4; + permute_ids[2 - start_id] =3D 3; + permute_ids[3 - start_id] =3D 5; + permute_ids[4 - start_id] =3D 1; + permute_ids[5 - start_id] =3D 7; + permute_ids[6 - start_id] =3D 2; + err =3D btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[2] FUNC 'f' type_id=3D6 linkage=3Dstatic", + "[3] PTR '(anon)' type_id=3D4", + "[4] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[5] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[6] FUNC_PROTO '(anon)' ret_type_id=3D4 vlen=3D1\n" + "\t'p' type_id=3D3"); + +done: + btf__free(btf); +} + +/* Ensure btf__permute work as expected with split BTF */ +static void test_permute_split(void) +{ + struct btf *split_btf =3D NULL, *base_btf =3D NULL; + __u32 permute_ids[4]; + int err; + int start_id; + + base_btf =3D btf__new_empty(); + if (!ASSERT_OK_PTR(base_btf, "empty_main_btf")) + return; + + btf__add_int(base_btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(base_btf, 1); /* [2] ptr to int */ + VALIDATE_RAW_BTF( + base_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1"); + split_btf =3D btf__new_empty_split(base_btf); + if (!ASSERT_OK_PTR(split_btf, "empty_split_btf")) + goto cleanup; + btf__add_struct(split_btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(split_btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(split_btf, 1); /* [5] int (*)(int p); */ + btf__add_func_param(split_btf, "p", 2); + btf__add_func(split_btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); = */ + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] FUNC 'f' type_id=3D5 linkage=3Dstatic"); + + start_id =3D btf__type_cnt(base_btf); + permute_ids[3 - start_id] =3D 6; /* [3] -> [6] */ + permute_ids[4 - start_id] =3D 3; /* [4] -> [3] */ + permute_ids[5 - start_id] =3D 5; /* [5] -> [5] */ + permute_ids[6 - start_id] =3D 4; /* [6] -> [4] */ + err =3D btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NUL= L); + if (!ASSERT_OK(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] FUNC 'f' type_id=3D5 linkage=3Dstatic", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + + /* + * For split BTF, id_map_cnt must equal to the number of types + * added on top of base BTF + */ + permute_ids[3 - start_id] =3D 4; + permute_ids[4 - start_id] =3D 3; + permute_ids[5 - start_id] =3D 5; + permute_ids[6 - start_id] =3D 6; + err =3D btf__permute(split_btf, permute_ids, 3, NULL); + if (!ASSERT_ERR(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] FUNC 'f' type_id=3D5 linkage=3Dstatic", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + + /* Multiple types can not be mapped to the same ID */ + permute_ids[3 - start_id] =3D 4; + permute_ids[4 - start_id] =3D 3; + permute_ids[5 - start_id] =3D 3; + permute_ids[6 - start_id] =3D 6; + err =3D btf__permute(split_btf, permute_ids, 4, NULL); + if (!ASSERT_ERR(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] FUNC 'f' type_id=3D5 linkage=3Dstatic", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + + /* Can not map to base ID */ + permute_ids[3 - start_id] =3D 4; + permute_ids[4 - start_id] =3D 2; + permute_ids[5 - start_id] =3D 5; + permute_ids[6 - start_id] =3D 6; + err =3D btf__permute(split_btf, permute_ids, 4, NULL); + if (!ASSERT_ERR(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] FUNC 'f' type_id=3D5 linkage=3Dstatic", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + +cleanup: + btf__free(split_btf); + btf__free(base_btf); +} + +/* Verify btf__permute function drops types correctly with base_btf */ +static void test_permute_drop_base(void) +{ + struct btf *btf; + __u32 permute_ids[6]; + int start_id =3D 1; + int err; + + btf =3D btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_main_btf")) + return; + + btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(btf, 1); /* [2] ptr to int */ + btf__add_struct(btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(btf, 1); /* [5] int (*)(int *p); */ + btf__add_func_param(btf, "p", 2); + btf__add_func(btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */ + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] FUNC 'f' type_id=3D5 linkage=3Dstatic"); + + /* Drop ID 4 */ + permute_ids[1 - start_id] =3D 5; /* [1] -> [5] */ + permute_ids[2 - start_id] =3D 1; /* [2] -> [1] */ + permute_ids[3 - start_id] =3D 2; /* [3] -> [2] */ + permute_ids[4 - start_id] =3D 0; /* Drop [4] */ + permute_ids[5 - start_id] =3D 3; /* [5] -> [3] */ + permute_ids[6 - start_id] =3D 4; /* [6] -> [4] */ + err =3D btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] PTR '(anon)' type_id=3D5", + "[2] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D5 bits_offset=3D0", + "[3] FUNC_PROTO '(anon)' ret_type_id=3D5 vlen=3D1\n" + "\t'p' type_id=3D1", + "[4] FUNC 'f' type_id=3D3 linkage=3Dstatic", + "[5] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED"); + + /* Continue dropping */ + permute_ids[1 - start_id] =3D 1; /* [1] -> [1] */ + permute_ids[2 - start_id] =3D 2; /* [2] -> [2] */ + permute_ids[3 - start_id] =3D 3; /* [3] -> [3] */ + permute_ids[4 - start_id] =3D 0; /* Drop [4] */ + permute_ids[5 - start_id] =3D 4; /* [5] -> [4] */ + err =3D btf__permute(btf, permute_ids, 5, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base_fail")) + goto done; + + + VALIDATE_RAW_BTF( + btf, + "[1] PTR '(anon)' type_id=3D4", + "[2] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[3] FUNC_PROTO '(anon)' ret_type_id=3D4 vlen=3D1\n" + "\t'p' type_id=3D1", + "[4] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED"); + + /* Cannot drop the ID referenced by others */ + permute_ids[1 - start_id] =3D 2; + permute_ids[2 - start_id] =3D 3; + permute_ids[3 - start_id] =3D 1; + permute_ids[4 - start_id] =3D 0; /* [4] is referenced by others */ + err =3D btf__permute(btf, permute_ids, 4, NULL); + if (!ASSERT_ERR(err, "btf__permute_drop_base_fail")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] PTR '(anon)' type_id=3D4", + "[2] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D4 bits_offset=3D0", + "[3] FUNC_PROTO '(anon)' ret_type_id=3D4 vlen=3D1\n" + "\t'p' type_id=3D1", + "[4] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED"); + + /* Drop 2 IDs at once */ + permute_ids[1 - start_id] =3D 2; /* [1] -> [2] */ + permute_ids[2 - start_id] =3D 0; /* Drop [2] */ + permute_ids[3 - start_id] =3D 0; /* Drop [3] */ + permute_ids[4 - start_id] =3D 1; /* [4] -> [1] */ + err =3D btf__permute(btf, permute_ids, 4, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base_fail")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1"); + + /* Drop all IDs */ + permute_ids[1 - start_id] =3D 0; /* Drop [1] */ + permute_ids[2 - start_id] =3D 0; /* Drop [2] */ + err =3D btf__permute(btf, permute_ids, 2, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base_fail")) + goto done; + if (!ASSERT_EQ(btf__type_cnt(btf), 1, "btf__permute_drop_base all")) + goto done; + +done: + btf__free(btf); +} + +/* Verify btf__permute function drops types correctly with split BTF */ +static void test_permute_drop_split(void) +{ + struct btf *split_btf =3D NULL, *base_btf =3D NULL; + __u32 permute_ids[4]; + int err; + int start_id; + + base_btf =3D btf__new_empty(); + if (!ASSERT_OK_PTR(base_btf, "empty_main_btf")) + return; + + btf__add_int(base_btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(base_btf, 1); /* [2] ptr to int */ + VALIDATE_RAW_BTF( + base_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1"); + split_btf =3D btf__new_empty_split(base_btf); + if (!ASSERT_OK_PTR(split_btf, "empty_split_btf")) + goto cleanup; + btf__add_struct(split_btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(split_btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(split_btf, 1); /* [5] int (*)(int p); */ + btf__add_func_param(split_btf, "p", 2); + btf__add_func(split_btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); = */ + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[4] STRUCT 's2' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[5] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[6] FUNC 'f' type_id=3D5 linkage=3Dstatic"); + + start_id =3D btf__type_cnt(base_btf); + + /* Drop ID 4 */ + permute_ids[3 - start_id] =3D 5; /* [3] -> [5] */ + permute_ids[4 - start_id] =3D 0; /* Drop [4] */ + permute_ids[5 - start_id] =3D 3; /* [5] -> [3] */ + permute_ids[6 - start_id] =3D 4; /* [6] -> [4] */ + err =3D btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NUL= L); + if (!ASSERT_OK(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[4] FUNC 'f' type_id=3D3 linkage=3Dstatic", + "[5] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + + /* Can not drop the type referenced by others */ + permute_ids[3 - start_id] =3D 0; /* [3] is referenced by [4] */ + permute_ids[4 - start_id] =3D 4; + permute_ids[5 - start_id] =3D 3; + err =3D btf__permute(split_btf, permute_ids, 3, NULL); + if (!ASSERT_ERR(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D1\n" + "\t'p' type_id=3D2", + "[4] FUNC 'f' type_id=3D3 linkage=3Dstatic", + "[5] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + + /* Continue dropping */ + permute_ids[3 - start_id] =3D 0; /* Drop [3] */ + permute_ids[4 - start_id] =3D 0; /* Drop [4] */ + permute_ids[5 - start_id] =3D 3; /* [5] -> [3] */ + err =3D btf__permute(split_btf, permute_ids, 3, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1", + "[3] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0"); + + /* Continue dropping */ + permute_ids[3 - start_id] =3D 0; /* Drop [3] */ + err =3D btf__permute(split_btf, permute_ids, 1, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] PTR '(anon)' type_id=3D1"); + +cleanup: + btf__free(split_btf); + btf__free(base_btf); +} + +/* Verify btf__permute then btf__dedup work correctly */ +static void test_permute_drop_dedup(void) +{ + struct btf *btf, *new_btf =3D NULL; + const struct btf_header *hdr; + const void *btf_data; + char expect_strs[] =3D "\0int\0s1\0m\0tag1\0tag2\0tag3"; + char expect_strs_dedupped[] =3D "\0int\0s1\0m\0tag1"; + __u32 permute_ids[5], btf_size; + int start_id =3D 1; + int err; + + btf =3D btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_main_btf")) + return; + + btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_struct(btf, "s1", 4); /* [2] struct s1 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_decl_tag(btf, "tag1", 2, -1); /* [3] tag -> s1: tag1 */ + btf__add_decl_tag(btf, "tag2", 2, 1); /* [4] tag -> s1/m: tag2 */ + btf__add_decl_tag(btf, "tag3", 2, 1); /* [5] tag -> s1/m: tag3 */ + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED", + "[2] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D1 bits_offset=3D0", + "[3] DECL_TAG 'tag1' type_id=3D2 component_idx=3D-1", + "[4] DECL_TAG 'tag2' type_id=3D2 component_idx=3D1", + "[5] DECL_TAG 'tag3' type_id=3D2 component_idx=3D1"); + + btf_data =3D btf__raw_data(btf, &btf_size); + if (!ASSERT_OK_PTR(btf_data, "btf__raw_data")) + goto done; + hdr =3D btf_data; + if (!ASSERT_EQ(hdr->str_len, ARRAY_SIZE(expect_strs), "expect_strs")) + goto done; + + new_btf =3D btf__new(btf_data, btf_size); + if (!ASSERT_OK_PTR(new_btf, "btf__new")) + goto done; + + /* Drop 2 IDs result in unreferenced strings */ + permute_ids[1 - start_id] =3D 3; /* [1] -> [3] */ + permute_ids[2 - start_id] =3D 1; /* [2] -> [1] */ + permute_ids[3 - start_id] =3D 2; /* [3] -> [2] */ + permute_ids[4 - start_id] =3D 0; /* Drop result in unreferenced "tag2" */ + permute_ids[5 - start_id] =3D 0; /* Drop result in unreferenced "tag3" */ + err =3D btf__permute(new_btf, permute_ids, 5, NULL); + if (!ASSERT_OK(err, "btf__permute")) + goto done; + + VALIDATE_RAW_BTF( + new_btf, + "[1] STRUCT 's1' size=3D4 vlen=3D1\n" + "\t'm' type_id=3D3 bits_offset=3D0", + "[2] DECL_TAG 'tag1' type_id=3D1 component_idx=3D-1", + "[3] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED"); + + btf_data =3D btf__raw_data(new_btf, &btf_size); + if (!ASSERT_OK_PTR(btf_data, "btf__raw_data")) + goto done; + hdr =3D btf_data; + if (!ASSERT_EQ(hdr->str_len, ARRAY_SIZE(expect_strs), "expect_strs")) + goto done; + + err =3D btf__dedup(new_btf, NULL); + if (!ASSERT_OK(err, "btf__dedup")) + goto done; + + btf_data =3D btf__raw_data(new_btf, &btf_size); + if (!ASSERT_OK_PTR(btf_data, "btf__raw_data")) + goto done; + hdr =3D btf_data; + if (!ASSERT_EQ(hdr->str_len, ARRAY_SIZE(expect_strs_dedupped), "expect_st= rs_dedupped")) + goto done; + +done: + btf__free(btf); + btf__free(new_btf); +} + +void test_btf_permute(void) +{ + if (test__start_subtest("permute_base")) + test_permute_base(); + if (test__start_subtest("permute_split")) + test_permute_split(); + if (test__start_subtest("permute_drop_base")) + test_permute_drop_base(); + if (test__start_subtest("permute_drop_split")) + test_permute_drop_split(); + if (test__start_subtest("permute_drop_dedup")) + test_permute_drop_dedup(); +} --=20 2.34.1