selftests/bpf: add btf_dump BTF-to-C conversion tests (2d2a3ad8) · Commits · 戴 / test

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

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		@@ -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;
		}

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