selftests/bpf: Add test involving restrict type qualifier

This change adds a type based test involving the restrict type qualifier
to the BPF selftests. On the btfgen path, this will verify that bpftool
correctly handles the corresponding RESTRICT BTF kind.
Signed-off-by: Daniel Müller <deso@posteo.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20220706212855.1700615-3-deso@posteo.net

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

@@ -764,6 +764,7 @@ static const struct core_reloc_test_case test_cases[] = {
 		.typedef_int_exists = 1,
 		.typedef_enum_exists = 1,
 		.typedef_void_ptr_exists = 1,
+		.typedef_restrict_ptr_exists = 1,
 		.typedef_func_proto_exists = 1,
 		.typedef_arr_exists = 1,
 
@@ -777,6 +778,7 @@ static const struct core_reloc_test_case test_cases[] = {
 		.typedef_int_matches = 1,
 		.typedef_enum_matches = 1,
 		.typedef_void_ptr_matches = 1,
+		.typedef_restrict_ptr_matches = 1,
 		.typedef_func_proto_matches = 1,
 		.typedef_arr_matches = 1,
 

tools/testing/selftests/bpf/progs/core_reloc_types.h

@@ -874,6 +874,7 @@ struct core_reloc_type_based_output {
 	bool typedef_int_exists;
 	bool typedef_enum_exists;
 	bool typedef_void_ptr_exists;
+	bool typedef_restrict_ptr_exists;
 	bool typedef_func_proto_exists;
 	bool typedef_arr_exists;
 
@@ -887,6 +888,7 @@ struct core_reloc_type_based_output {
 	bool typedef_int_matches;
 	bool typedef_enum_matches;
 	bool typedef_void_ptr_matches;
+	bool typedef_restrict_ptr_matches;
 	bool typedef_func_proto_matches;
 	bool typedef_arr_matches;
 
@@ -939,6 +941,7 @@ typedef int int_typedef;
 typedef enum { TYPEDEF_ENUM_VAL1, TYPEDEF_ENUM_VAL2 } enum_typedef;
 
 typedef void *void_ptr_typedef;
+typedef int *restrict restrict_ptr_typedef;
 
 typedef int (*func_proto_typedef)(long);
 
@@ -955,8 +958,9 @@ struct core_reloc_type_based {
 	int_typedef f8;
 	enum_typedef f9;
 	void_ptr_typedef f10;
-	func_proto_typedef f11;
-	arr_typedef f12;
+	restrict_ptr_typedef f11;
+	func_proto_typedef f12;
+	arr_typedef f13;
 };
 
 /* no types in target */

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

@@ -51,6 +51,7 @@ typedef int int_typedef;
 typedef enum { TYPEDEF_ENUM_VAL1, TYPEDEF_ENUM_VAL2 } enum_typedef;
 
 typedef void *void_ptr_typedef;
+typedef int *restrict restrict_ptr_typedef;
 
 typedef int (*func_proto_typedef)(long);
 
@@ -67,6 +68,7 @@ struct core_reloc_type_based_output {
 	bool typedef_int_exists;
 	bool typedef_enum_exists;
 	bool typedef_void_ptr_exists;
+	bool typedef_restrict_ptr_exists;
 	bool typedef_func_proto_exists;
 	bool typedef_arr_exists;
 
@@ -80,6 +82,7 @@ struct core_reloc_type_based_output {
 	bool typedef_int_matches;
 	bool typedef_enum_matches;
 	bool typedef_void_ptr_matches;
+	bool typedef_restrict_ptr_matches;
 	bool typedef_func_proto_matches;
 	bool typedef_arr_matches;
 
@@ -118,6 +121,7 @@ int test_core_type_based(void *ctx)
 	out->typedef_int_exists = bpf_core_type_exists(int_typedef);
 	out->typedef_enum_exists = bpf_core_type_exists(enum_typedef);
 	out->typedef_void_ptr_exists = bpf_core_type_exists(void_ptr_typedef);
+	out->typedef_restrict_ptr_exists = bpf_core_type_exists(restrict_ptr_typedef);
 	out->typedef_func_proto_exists = bpf_core_type_exists(func_proto_typedef);
 	out->typedef_arr_exists = bpf_core_type_exists(arr_typedef);
 
@@ -131,6 +135,7 @@ int test_core_type_based(void *ctx)
 	out->typedef_int_matches = bpf_core_type_matches(int_typedef);
 	out->typedef_enum_matches = bpf_core_type_matches(enum_typedef);
 	out->typedef_void_ptr_matches = bpf_core_type_matches(void_ptr_typedef);
+	out->typedef_restrict_ptr_matches = bpf_core_type_matches(restrict_ptr_typedef);
 	out->typedef_func_proto_matches = bpf_core_type_matches(func_proto_typedef);
 	out->typedef_arr_matches = bpf_core_type_matches(arr_typedef);