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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024, Oracle and/or its affiliates. */
#include <test_progs.h>
#include <bpf/btf.h>
#include "btf_helpers.h"
/* Fabricate base, split BTF with references to base types needed; then create
* split BTF with distilled base BTF and ensure expectations are met:
* - only referenced base types from split BTF are present
* - struct/union/enum are represented as empty unless anonymous, when they
* are represented in full in split BTF
*/
static void test_distilled_base(void)
{
struct btf *btf1 = NULL, *btf2 = NULL, *btf3 = NULL, *btf4 = NULL;
btf1 = btf__new_empty();
if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
return;
btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */
btf__add_ptr(btf1, 1); /* [2] ptr to int */
btf__add_struct(btf1, "s1", 8); /* [3] struct s1 { */
btf__add_field(btf1, "f1", 2, 0, 0); /* int *f1; */
/* } */
btf__add_struct(btf1, "", 12); /* [4] struct { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
btf__add_field(btf1, "f2", 3, 32, 0); /* struct s1 f2; */
/* } */
btf__add_int(btf1, "unsigned int", 4, 0); /* [5] unsigned int */
btf__add_union(btf1, "u1", 12); /* [6] union u1 { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
btf__add_field(btf1, "f2", 2, 0, 0); /* int *f2; */
/* } */
btf__add_union(btf1, "", 4); /* [7] union { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
btf__add_enum(btf1, "e1", 4); /* [8] enum e1 { */
btf__add_enum_value(btf1, "v1", 1); /* v1 = 1; */
/* } */
btf__add_enum(btf1, "", 4); /* [9] enum { */
btf__add_enum_value(btf1, "av1", 2); /* av1 = 2; */
/* } */
btf__add_enum64(btf1, "e641", 8, true); /* [10] enum64 { */
btf__add_enum64_value(btf1, "v1", 1024); /* v1 = 1024; */
/* } */
btf__add_enum64(btf1, "", 8, true); /* [11] enum64 { */
btf__add_enum64_value(btf1, "v1", 1025); /* v1 = 1025; */
/* } */
btf__add_struct(btf1, "unneeded", 4); /* [12] struct unneeded { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
btf__add_struct(btf1, "embedded", 4); /* [13] struct embedded { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
btf__add_func_proto(btf1, 1); /* [14] int (*)(int *p1); */
btf__add_func_param(btf1, "p1", 1);
btf__add_array(btf1, 1, 1, 3); /* [15] int [3]; */
btf__add_struct(btf1, "from_proto", 4); /* [16] struct from_proto { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
btf__add_union(btf1, "u1", 4); /* [17] union u1 { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
VALIDATE_RAW_BTF(
btf1,
"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[2] PTR '(anon)' type_id=1",
"[3] STRUCT 's1' size=8 vlen=1\n"
"\t'f1' type_id=2 bits_offset=0",
"[4] STRUCT '(anon)' size=12 vlen=2\n"
"\t'f1' type_id=1 bits_offset=0\n"
"\t'f2' type_id=3 bits_offset=32",
"[5] INT 'unsigned int' size=4 bits_offset=0 nr_bits=32 encoding=(none)",
"[6] UNION 'u1' size=12 vlen=2\n"
"\t'f1' type_id=1 bits_offset=0\n"
"\t'f2' type_id=2 bits_offset=0",
"[7] UNION '(anon)' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[8] ENUM 'e1' encoding=UNSIGNED size=4 vlen=1\n"
"\t'v1' val=1",
"[9] ENUM '(anon)' encoding=UNSIGNED size=4 vlen=1\n"
"\t'av1' val=2",
"[10] ENUM64 'e641' encoding=SIGNED size=8 vlen=1\n"
"\t'v1' val=1024",
"[11] ENUM64 '(anon)' encoding=SIGNED size=8 vlen=1\n"
"\t'v1' val=1025",
"[12] STRUCT 'unneeded' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[13] STRUCT 'embedded' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[14] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
"\t'p1' type_id=1",
"[15] ARRAY '(anon)' type_id=1 index_type_id=1 nr_elems=3",
"[16] STRUCT 'from_proto' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[17] UNION 'u1' 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_ptr(btf2, 3); /* [18] ptr to struct s1 */
/* add ptr to struct anon */
btf__add_ptr(btf2, 4); /* [19] ptr to struct (anon) */
btf__add_const(btf2, 6); /* [20] const union u1 */
btf__add_restrict(btf2, 7); /* [21] restrict union (anon) */
btf__add_volatile(btf2, 8); /* [22] volatile enum e1 */
btf__add_typedef(btf2, "et", 9); /* [23] typedef enum (anon) */
btf__add_const(btf2, 10); /* [24] const enum64 e641 */
btf__add_ptr(btf2, 11); /* [25] restrict enum64 (anon) */
btf__add_struct(btf2, "with_embedded", 4); /* [26] struct with_embedded { */
btf__add_field(btf2, "f1", 13, 0, 0); /* struct embedded f1; */
/* } */
btf__add_func(btf2, "fn", BTF_FUNC_STATIC, 14); /* [27] int fn(int p1); */
btf__add_typedef(btf2, "arraytype", 15); /* [28] typedef int[3] foo; */
btf__add_func_proto(btf2, 1); /* [29] int (*)(struct from proto p1); */
btf__add_func_param(btf2, "p1", 16);
VALIDATE_RAW_BTF(
btf2,
"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[2] PTR '(anon)' type_id=1",
"[3] STRUCT 's1' size=8 vlen=1\n"
"\t'f1' type_id=2 bits_offset=0",
"[4] STRUCT '(anon)' size=12 vlen=2\n"
"\t'f1' type_id=1 bits_offset=0\n"
"\t'f2' type_id=3 bits_offset=32",
"[5] INT 'unsigned int' size=4 bits_offset=0 nr_bits=32 encoding=(none)",
"[6] UNION 'u1' size=12 vlen=2\n"
"\t'f1' type_id=1 bits_offset=0\n"
"\t'f2' type_id=2 bits_offset=0",
"[7] UNION '(anon)' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[8] ENUM 'e1' encoding=UNSIGNED size=4 vlen=1\n"
"\t'v1' val=1",
"[9] ENUM '(anon)' encoding=UNSIGNED size=4 vlen=1\n"
"\t'av1' val=2",
"[10] ENUM64 'e641' encoding=SIGNED size=8 vlen=1\n"
"\t'v1' val=1024",
"[11] ENUM64 '(anon)' encoding=SIGNED size=8 vlen=1\n"
"\t'v1' val=1025",
"[12] STRUCT 'unneeded' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[13] STRUCT 'embedded' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[14] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
"\t'p1' type_id=1",
"[15] ARRAY '(anon)' type_id=1 index_type_id=1 nr_elems=3",
"[16] STRUCT 'from_proto' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[17] UNION 'u1' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[18] PTR '(anon)' type_id=3",
"[19] PTR '(anon)' type_id=4",
"[20] CONST '(anon)' type_id=6",
"[21] RESTRICT '(anon)' type_id=7",
"[22] VOLATILE '(anon)' type_id=8",
"[23] TYPEDEF 'et' type_id=9",
"[24] CONST '(anon)' type_id=10",
"[25] PTR '(anon)' type_id=11",
"[26] STRUCT 'with_embedded' size=4 vlen=1\n"
"\t'f1' type_id=13 bits_offset=0",
"[27] FUNC 'fn' type_id=14 linkage=static",
"[28] TYPEDEF 'arraytype' type_id=15",
"[29] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
"\t'p1' type_id=16");
if (!ASSERT_EQ(0, btf__distill_base(btf2, &btf3, &btf4),
"distilled_base") ||
!ASSERT_OK_PTR(btf3, "distilled_base") ||
!ASSERT_OK_PTR(btf4, "distilled_split") ||
!ASSERT_EQ(8, btf__type_cnt(btf3), "distilled_base_type_cnt"))
goto cleanup;
VALIDATE_RAW_BTF(
btf4,
"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[2] STRUCT 's1' size=8 vlen=0",
"[3] UNION 'u1' size=12 vlen=0",
"[4] ENUM 'e1' encoding=UNSIGNED size=4 vlen=0",
"[5] ENUM 'e641' encoding=UNSIGNED size=8 vlen=0",
"[6] STRUCT 'embedded' size=4 vlen=0",
"[7] STRUCT 'from_proto' size=4 vlen=0",
/* split BTF; these types should match split BTF above from 17-28, with
* updated type id references
*/
"[8] PTR '(anon)' type_id=2",
"[9] PTR '(anon)' type_id=20",
"[10] CONST '(anon)' type_id=3",
"[11] RESTRICT '(anon)' type_id=21",
"[12] VOLATILE '(anon)' type_id=4",
"[13] TYPEDEF 'et' type_id=22",
"[14] CONST '(anon)' type_id=5",
"[15] PTR '(anon)' type_id=23",
"[16] STRUCT 'with_embedded' size=4 vlen=1\n"
"\t'f1' type_id=6 bits_offset=0",
"[17] FUNC 'fn' type_id=24 linkage=static",
"[18] TYPEDEF 'arraytype' type_id=25",
"[19] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
"\t'p1' type_id=7",
/* split BTF types added from original base BTF below */
"[20] STRUCT '(anon)' size=12 vlen=2\n"
"\t'f1' type_id=1 bits_offset=0\n"
"\t'f2' type_id=2 bits_offset=32",
"[21] UNION '(anon)' size=4 vlen=1\n"
"\t'f1' type_id=1 bits_offset=0",
"[22] ENUM '(anon)' encoding=UNSIGNED size=4 vlen=1\n"
"\t'av1' val=2",
"[23] ENUM64 '(anon)' encoding=SIGNED size=8 vlen=1\n"
"\t'v1' val=1025",
"[24] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
"\t'p1' type_id=1",
"[25] ARRAY '(anon)' type_id=1 index_type_id=1 nr_elems=3");
cleanup:
btf__free(btf4);
btf__free(btf3);
btf__free(btf2);
btf__free(btf1);
}
/* create split reference BTF from vmlinux + split BTF with a few type references;
* ensure the resultant split reference BTF is as expected, containing only types
* needed to disambiguate references from split BTF.
*/
static void test_distilled_base_vmlinux(void)
{
struct btf *split_btf = NULL, *vmlinux_btf = btf__load_vmlinux_btf();
struct btf *split_dist = NULL, *base_dist = NULL;
__s32 int_id, myint_id;
if (!ASSERT_OK_PTR(vmlinux_btf, "load_vmlinux"))
return;
int_id = btf__find_by_name_kind(vmlinux_btf, "int", BTF_KIND_INT);
if (!ASSERT_GT(int_id, 0, "find_int"))
goto cleanup;
split_btf = btf__new_empty_split(vmlinux_btf);
if (!ASSERT_OK_PTR(split_btf, "new_split"))
goto cleanup;
myint_id = btf__add_typedef(split_btf, "myint", int_id);
btf__add_ptr(split_btf, myint_id);
if (!ASSERT_EQ(btf__distill_base(split_btf, &base_dist, &split_dist), 0,
"distill_vmlinux_base"))
goto cleanup;
if (!ASSERT_OK_PTR(split_dist, "split_distilled") ||
!ASSERT_OK_PTR(base_dist, "base_dist"))
goto cleanup;
VALIDATE_RAW_BTF(
split_dist,
"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
"[2] TYPEDEF 'myint' type_id=1",
"[3] PTR '(anon)' type_id=2");
cleanup:
btf__free(split_dist);
btf__free(base_dist);
btf__free(split_btf);
btf__free(vmlinux_btf);
}
void test_btf_distill(void)
{
if (test__start_subtest("distilled_base"))
test_distilled_base();
if (test__start_subtest("distilled_base_vmlinux"))
test_distilled_base_vmlinux();
}
|
