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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);
}
void test_btf_split() {
struct btf_dump *d = NULL;
const struct btf_type *t;
struct btf *btf1, *btf2;
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");
/* 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(btf2, btf_dump_printf, dump_buf_file, NULL);
if (!ASSERT_OK_PTR(d, "btf_dump__new"))
goto cleanup;
for (i = 1; i < btf__type_cnt(btf2); 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", "c_dump");
cleanup:
if (dump_buf_file)
fclose(dump_buf_file);
free(dump_buf);
btf_dump__free(d);
btf__free(btf1);
btf__free(btf2);
}
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