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Commit 2d2a3ad8 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

selftests/bpf: add btf_dump BTF-to-C conversion tests 



Add new test_btf_dump set of tests, validating BTF-to-C conversion
correctness. Tests rely on clang to generate BTF from provided C test
cases.

Signed-off-by: default avatarAndrii Nakryiko <andriin@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 351131b5

tools/testing/selftests/bpf/.gitignore

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@@ -36,3 +36,4 @@ alu32 
libbpf.pc

libbpf.so.*

test_hashmap

test_btf_dump

tools/testing/selftests/bpf/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -23,7 +23,8 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test 
	test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \

	test_sock test_btf test_sockmap test_lirc_mode2_user get_cgroup_id_user \

	test_socket_cookie test_cgroup_storage test_select_reuseport test_section_names \

	test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap

	test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap \

	test_btf_dump



BPF_OBJ_FILES = $(patsubst %.c,%.o, $(notdir $(wildcard progs/*.c)))

TEST_GEN_FILES = $(BPF_OBJ_FILES)

tools/testing/selftests/bpf/progs/btf_dump_test_case_bitfields.c

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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)



/*

 * BTF-to-C dumper tests for bitfield.

 *

 * Copyright (c) 2019 Facebook

 */

#include <stdbool.h>



/* ----- START-EXPECTED-OUTPUT ----- */

/*

 *struct bitfields_only_mixed_types {

 *	int a: 3;

 *	long int b: 2;

 *	_Bool c: 1;

 *	enum {

 *		A = 0,

 *		B = 1,

 *	} d: 1;

 *	short e: 5;

 *	int: 20;

 *	unsigned int f: 30;

 *};

 *

 */

/* ------ END-EXPECTED-OUTPUT ------ */



struct bitfields_only_mixed_types {

	int a: 3;

	long int b: 2;

	bool c: 1; /* it's really a _Bool type */

	enum {

		A, /* A = 0, dumper is very explicit */

		B, /* B = 1, same */

	} d: 1;

	short e: 5;

	/* 20-bit padding here */

	unsigned f: 30; /* this gets aligned on 4-byte boundary */

};



/* ----- START-EXPECTED-OUTPUT ----- */

/*

 *struct bitfield_mixed_with_others {

 *	char: 4;

 *	int a: 4;

 *	short b;

 *	long int c;

 *	long int d: 8;

 *	int e;

 *	int f;

 *};

 *

 */

/* ------ END-EXPECTED-OUTPUT ------ */

struct bitfield_mixed_with_others {

	long: 4; /* char is enough as a backing field */

	int a: 4;

	/* 8-bit implicit padding */

	short b; /* combined with previous bitfield */

	/* 4 more bytes of implicit padding */

	long c;

	long d: 8;

	/* 24 bits implicit padding */

	int e; /* combined with previous bitfield */

	int f;

	/* 4 bytes of padding */

};



/* ----- START-EXPECTED-OUTPUT ----- */

/*

 *struct bitfield_flushed {

 *	int a: 4;

 *	long: 60;

 *	long int b: 16;

 *};

 *

 */

/* ------ END-EXPECTED-OUTPUT ------ */

struct bitfield_flushed {

	int a: 4;

	long: 0; /* flush until next natural alignment boundary */

	long b: 16;

};



int f(struct {

	struct bitfields_only_mixed_types _1;

	struct bitfield_mixed_with_others _2;

	struct bitfield_flushed _3;

} *_)

{

	return 0;

}

tools/testing/selftests/bpf/progs/btf_dump_test_case_multidim.c

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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)



/*

 * BTF-to-C dumper test for multi-dimensional array output.

 *

 * Copyright (c) 2019 Facebook

 */

/* ----- START-EXPECTED-OUTPUT ----- */

typedef int arr_t[2];



typedef int multiarr_t[3][4][5];



typedef int *ptr_arr_t[6];



typedef int *ptr_multiarr_t[7][8][9][10];



typedef int * (*fn_ptr_arr_t[11])();



typedef int * (*fn_ptr_multiarr_t[12][13])();



struct root_struct {

	arr_t _1;

	multiarr_t _2;

	ptr_arr_t _3;

	ptr_multiarr_t _4;

	fn_ptr_arr_t _5;

	fn_ptr_multiarr_t _6;

};



/* ------ END-EXPECTED-OUTPUT ------ */



int f(struct root_struct *s)

{

	return 0;

}

tools/testing/selftests/bpf/progs/btf_dump_test_case_namespacing.c

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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)



/*

 * BTF-to-C dumper test validating no name versioning happens between

 * independent C namespaces (struct/union/enum vs typedef/enum values).

 *

 * Copyright (c) 2019 Facebook

 */

/* ----- START-EXPECTED-OUTPUT ----- */

struct S {

	int S;

	int U;

};



typedef struct S S;



union U {

	int S;

	int U;

};



typedef union U U;



enum E {

	V = 0,

};



typedef enum E E;



struct A {};



union B {};



enum C {

	A = 1,

	B = 2,

	C = 3,

};



struct X {};



union Y {};



enum Z;



typedef int X;



typedef int Y;



typedef int Z;



/*------ END-EXPECTED-OUTPUT ------ */



int f(struct {

	struct S _1;

	S _2;

	union U _3;

	U _4;

	enum E _5;

	E _6;

	struct A a;

	union B b;

	enum C c;

	struct X x;

	union Y y;

	enum Z *z;

	X xx;

	Y yy;

	Z zz;

} *_)

{

	return 0;

}