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selftests/bpf: Add selftest for pointer-to-array-of-struct BTF dump

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Bpftool used to issue forward declarations for a struct used as part of
a pointer to array, which is invalid. Add a test to check that the
struct is fully defined in this case:

	@@ -134,9 +134,9 @@
	 	};
	 };

	-struct struct_in_array {};
	+struct struct_in_array;

	-struct struct_in_array_typed {};
	+struct struct_in_array_typed;

	 typedef struct struct_in_array_typed struct_in_array_t[2];

	@@ -189,3 +189,7 @@
	 	struct struct_with_embedded_stuff _14;
	 };

	+struct struct_in_array {};
	+
	+struct struct_in_array_typed {};
	+
	...
	#13/1 btf_dump: syntax:FAIL

Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210319112554.794552-3-jean-philippe@linaro.org
This commit is contained in:
Jean-Philippe Brucker 2021-03-19 12:25:55 +01:00 committed by Andrii Nakryiko
parent 901ee1d750
commit f118aac651
1 changed files with 8 additions and 0 deletions
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8
tools/testing/selftests/bpf/progs/btf_dump_test_case_syntax.c
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@ -174,6 +174,12 @@ struct struct_in_struct {
};
};
struct struct_in_array {};
struct struct_in_array_typed {};
typedef struct struct_in_array_typed struct_in_array_t[2];
struct struct_with_embedded_stuff {
int a;
struct {
@ -203,6 +209,8 @@ struct struct_with_embedded_stuff {
} r[5];
struct struct_in_struct s[10];
int t[11];
struct struct_in_array (*u)[2];
struct_in_array_t *v;
};
struct root_struct {