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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include <bpf/btf.h>
static char *dump_buf;
static size_t dump_buf_sz;
static FILE *dump_buf_file;
static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
{
vfprintf(ctx, fmt, args);
}
/* Write raw BTF to file, return number of bytes written or negative errno */
static ssize_t btf_raw_write(struct btf *btf, char *file)
{
ssize_t written = 0;
const void *data;
__u32 size = 0;
int fd, ret;
fd = mkstemp(file);
if (!ASSERT_GE(fd, 0, "create_file"))
return -errno;
data = btf__raw_data(btf, &size);
if (!ASSERT_OK_PTR(data, "btf__raw_data")) {
close(fd);
return -EINVAL;
}
while (written < size) {
ret = write(fd, data + written, size - written);
if (!ASSERT_GE(ret, 0, "write succeeded")) {
close(fd);
return -errno;
}
written += ret;
}
close(fd);
return written;
}
static void __test_btf_split(bool multi)
{
char multisplit_btf_file[] = "/tmp/test_btf_multisplit.XXXXXX";
char split_btf_file[] = "/tmp/test_btf_split.XXXXXX";
char base_btf_file[] = "/tmp/test_btf_base.XXXXXX";
ssize_t multisplit_btf_sz = 0, split_btf_sz = 0, base_btf_sz = 0;
struct btf_dump *d = NULL;
const struct btf_type *t, *ot;
struct btf *btf1 = NULL, *btf2 = NULL, *btf3 = NULL;
struct btf *btf4 = NULL, *btf5 = NULL, *btf6 = NULL;
int str_off, i, err;
btf1 = btf__new_empty();
if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
return;
btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
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", 4); /* [3] struct s1 { */
btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
/* } */
btf2 = btf__new_empty_split(btf1);
if (!ASSERT_OK_PTR(btf2, "empty_split_btf"))
goto cleanup;
/* pointer size should be "inherited" from main BTF */
ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz");
str_off = btf__find_str(btf2, "int");
ASSERT_NEQ(str_off, -ENOENT, "str_int_missing");
t = btf__type_by_id(btf2, 1);
if (!ASSERT_OK_PTR(t, "int_type"))
goto cleanup;
ASSERT_EQ(btf_is_int(t), true, "int_kind");
ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name");
btf__add_struct(btf2, "s2", 16); /* [4] struct s2 { */
btf__add_field(btf2, "f1", 3, 0, 0); /* struct s1 f1; */
btf__add_field(btf2, "f2", 1, 32, 0); /* int f2; */
btf__add_field(btf2, "f3", 2, 64, 0); /* int *f3; */
/* } */
t = btf__type_by_id(btf1, 4);
ASSERT_NULL(t, "split_type_in_main");
t = btf__type_by_id(btf2, 4);
if (!ASSERT_OK_PTR(t, "split_struct_type"))
goto cleanup;
ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind");
ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen");
ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name");
if (multi) {
btf3 = btf__new_empty_split(btf2);
if (!ASSERT_OK_PTR(btf3, "multi_split_btf"))
goto cleanup;
} else {
btf3 = btf2;
}
btf__add_union(btf3, "u1", 16); /* [5] union u1 { */
btf__add_field(btf3, "f1", 4, 0, 0); /* struct s2 f1; */
btf__add_field(btf3, "uf2", 1, 0, 0); /* int f2; */
/* } */
if (multi) {
t = btf__type_by_id(btf2, 5);
ASSERT_NULL(t, "multisplit_type_in_first_split");
}
t = btf__type_by_id(btf3, 5);
if (!ASSERT_OK_PTR(t, "split_union_type"))
goto cleanup;
ASSERT_EQ(btf_is_union(t), true, "split_union_kind");
ASSERT_EQ(btf_vlen(t), 2, "split_union_vlen");
ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "u1", "split_union_name");
ASSERT_EQ(btf__type_cnt(btf3), 6, "split_type_cnt");
t = btf__type_by_id(btf3, 1);
if (!ASSERT_OK_PTR(t, "split_base_type"))
goto cleanup;
ASSERT_EQ(btf_is_int(t), true, "split_base_int");
ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "int", "split_base_type_name");
/* BTF-to-C dump of split BTF */
dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
return;
d = btf_dump__new(btf3, btf_dump_printf, dump_buf_file, NULL);
if (!ASSERT_OK_PTR(d, "btf_dump__new"))
goto cleanup;
for (i = 1; i < btf__type_cnt(btf3); i++) {
err = btf_dump__dump_type(d, i);
ASSERT_OK(err, "dump_type_ok");
}
fflush(dump_buf_file);
dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
ASSERT_STREQ(dump_buf,
"struct s1 {\n"
" int f1;\n"
"};\n\n"
"struct s2 {\n"
" struct s1 f1;\n"
" int f2;\n"
" int *f3;\n"
"};\n\n"
"union u1 {\n"
" struct s2 f1;\n"
" int uf2;\n"
"};\n\n", "c_dump");
/* write base, split BTFs to files and ensure parsing succeeds */
base_btf_sz = btf_raw_write(btf1, base_btf_file);
if (base_btf_sz < 0)
goto cleanup;
split_btf_sz = btf_raw_write(btf2, split_btf_file);
if (split_btf_sz < 0)
goto cleanup;
btf4 = btf__parse(base_btf_file, NULL);
if (!ASSERT_OK_PTR(btf4, "parse_base"))
goto cleanup;
btf5 = btf__parse_split(split_btf_file, btf4);
if (!ASSERT_OK_PTR(btf5, "parse_split"))
goto cleanup;
if (multi) {
multisplit_btf_sz = btf_raw_write(btf3, multisplit_btf_file);
if (multisplit_btf_sz < 0)
goto cleanup;
btf6 = btf__parse_split(multisplit_btf_file, btf5);
if (!ASSERT_OK_PTR(btf6, "parse_multisplit"))
goto cleanup;
} else {
btf6 = btf5;
}
if (!ASSERT_EQ(btf__type_cnt(btf3), btf__type_cnt(btf6), "cmp_type_cnt"))
goto cleanup;
/* compare parsed to original BTF */
for (i = 1; i < btf__type_cnt(btf6); i++) {
t = btf__type_by_id(btf6, i);
if (!ASSERT_OK_PTR(t, "type_in_parsed_btf"))
goto cleanup;
ot = btf__type_by_id(btf3, i);
if (!ASSERT_OK_PTR(ot, "type_in_orig_btf"))
goto cleanup;
if (!ASSERT_EQ(memcmp(t, ot, sizeof(*ot)), 0, "cmp_parsed_orig_btf"))
goto cleanup;
}
cleanup:
if (dump_buf_file)
fclose(dump_buf_file);
free(dump_buf);
btf_dump__free(d);
btf__free(btf1);
btf__free(btf2);
if (btf2 != btf3)
btf__free(btf3);
btf__free(btf4);
btf__free(btf5);
if (btf5 != btf6)
btf__free(btf6);
if (base_btf_sz > 0)
unlink(base_btf_file);
if (split_btf_sz > 0)
unlink(split_btf_file);
if (multisplit_btf_sz > 0)
unlink(multisplit_btf_file);
}
void test_btf_split(void)
{
if (test__start_subtest("single_split"))
__test_btf_split(false);
if (test__start_subtest("multi_split"))
__test_btf_split(true);
}
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