tools/testing/selftests/bpf/prog_tests/btf_split.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/btf_split.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/btf_split.c
Extension
.c
Size
6315 bytes
Lines
227
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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");

Annotation

Implementation Notes