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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
Extension
.c
Size
17560 bytes
Lines
570
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

struct s1 {\n\
	int f1;\n\
};\n\
\n\
typedef int t1;\n\n", "c_dump");

	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);		/* [5] struct s2 {	*/
	btf__add_field(btf2, "f1", 7, 0, 0);		/*      struct s1 f1;	*/
	btf__add_field(btf2, "f2", 6, 32, 0);		/*      int f2;		*/
	btf__add_field(btf2, "f3", 2, 64, 0);		/*      int *f3;	*/
							/* } */

	/* duplicated int */
	btf__add_int(btf2, "int", 4, BTF_INT_SIGNED);	/* [6] int */

	/* duplicated struct s1 */
	btf__add_struct(btf2, "s1", 4);			/* [7] struct s1 { */
	btf__add_field(btf2, "f1", 6, 0, 0);		/*      int f1; */
							/* } */

	/* duplicated typedef t1 */
	btf__add_typedef(btf2, "t1", 6);		/* [8] typedef int */

	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=4 vlen=1\n"
		"\t'f1' type_id=1 bits_offset=0",
		"[4] TYPEDEF 't1' type_id=1",
		"[5] STRUCT 's2' size=16 vlen=3\n"
		"\t'f1' type_id=7 bits_offset=0\n"
		"\t'f2' type_id=6 bits_offset=32\n"
		"\t'f3' type_id=2 bits_offset=64",
		"[6] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
		"[7] STRUCT 's1' size=4 vlen=1\n"
		"\t'f1' type_id=6 bits_offset=0",
		"[8] TYPEDEF 't1' type_id=6");

	ASSERT_STREQ(btf_type_c_dump(btf2), "\
struct s1 {\n\
	int f1;\n\
};\n\
\n\
typedef int t1;\n\
\n\
struct s1___2 {\n\
	int f1;\n\
};\n\
\n\
struct s2 {\n\
	struct s1___2 f1;\n\
	int f2;\n\
	int *f3;\n\
};\n\
\n\
typedef int t1___2;\n\n", "c_dump");

	err = btf__dedup(btf2, NULL);
	if (!ASSERT_OK(err, "btf_dedup"))
		goto cleanup;

	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=4 vlen=1\n"
		"\t'f1' type_id=1 bits_offset=0",
		"[4] TYPEDEF 't1' type_id=1",
		"[5] STRUCT 's2' size=16 vlen=3\n"
		"\t'f1' type_id=3 bits_offset=0\n"
		"\t'f2' type_id=1 bits_offset=32\n"
		"\t'f3' type_id=2 bits_offset=64");

Annotation

Implementation Notes