1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 #include <test_progs.h> 4 #include <bpf/btf.h> 5 6 static char *dump_buf; 7 static size_t dump_buf_sz; 8 static FILE *dump_buf_file; 9 10 static void btf_dump_printf(void *ctx, const char *fmt, va_list args) 11 { 12 vfprintf(ctx, fmt, args); 13 } 14 15 static void __test_btf_split(bool multi) 16 { 17 struct btf_dump *d = NULL; 18 const struct btf_type *t; 19 struct btf *btf1, *btf2, *btf3 = NULL; 20 int str_off, i, err; 21 22 btf1 = btf__new_empty(); 23 if (!ASSERT_OK_PTR(btf1, "empty_main_btf")) 24 return; 25 26 btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */ 27 28 btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */ 29 btf__add_ptr(btf1, 1); /* [2] ptr to int */ 30 31 btf__add_struct(btf1, "s1", 4); /* [3] struct s1 { */ 32 btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */ 33 /* } */ 34 35 btf2 = btf__new_empty_split(btf1); 36 if (!ASSERT_OK_PTR(btf2, "empty_split_btf")) 37 goto cleanup; 38 39 /* pointer size should be "inherited" from main BTF */ 40 ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz"); 41 42 str_off = btf__find_str(btf2, "int"); 43 ASSERT_NEQ(str_off, -ENOENT, "str_int_missing"); 44 45 t = btf__type_by_id(btf2, 1); 46 if (!ASSERT_OK_PTR(t, "int_type")) 47 goto cleanup; 48 ASSERT_EQ(btf_is_int(t), true, "int_kind"); 49 ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name"); 50 51 btf__add_struct(btf2, "s2", 16); /* [4] struct s2 { */ 52 btf__add_field(btf2, "f1", 3, 0, 0); /* struct s1 f1; */ 53 btf__add_field(btf2, "f2", 1, 32, 0); /* int f2; */ 54 btf__add_field(btf2, "f3", 2, 64, 0); /* int *f3; */ 55 /* } */ 56 57 t = btf__type_by_id(btf1, 4); 58 ASSERT_NULL(t, "split_type_in_main"); 59 60 t = btf__type_by_id(btf2, 4); 61 if (!ASSERT_OK_PTR(t, "split_struct_type")) 62 goto cleanup; 63 ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind"); 64 ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen"); 65 ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name"); 66 67 if (multi) { 68 btf3 = btf__new_empty_split(btf2); 69 if (!ASSERT_OK_PTR(btf3, "multi_split_btf")) 70 goto cleanup; 71 } else { 72 btf3 = btf2; 73 } 74 75 btf__add_union(btf3, "u1", 16); /* [5] union u1 { */ 76 btf__add_field(btf3, "f1", 4, 0, 0); /* struct s2 f1; */ 77 btf__add_field(btf3, "uf2", 1, 0, 0); /* int f2; */ 78 /* } */ 79 80 if (multi) { 81 t = btf__type_by_id(btf2, 5); 82 ASSERT_NULL(t, "multisplit_type_in_first_split"); 83 } 84 85 t = btf__type_by_id(btf3, 5); 86 if (!ASSERT_OK_PTR(t, "split_union_type")) 87 goto cleanup; 88 ASSERT_EQ(btf_is_union(t), true, "split_union_kind"); 89 ASSERT_EQ(btf_vlen(t), 2, "split_union_vlen"); 90 ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "u1", "split_union_name"); 91 ASSERT_EQ(btf__type_cnt(btf3), 6, "split_type_cnt"); 92 93 t = btf__type_by_id(btf3, 1); 94 if (!ASSERT_OK_PTR(t, "split_base_type")) 95 goto cleanup; 96 ASSERT_EQ(btf_is_int(t), true, "split_base_int"); 97 ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "int", "split_base_type_name"); 98 99 /* BTF-to-C dump of split BTF */ 100 dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz); 101 if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream")) 102 return; 103 d = btf_dump__new(btf3, btf_dump_printf, dump_buf_file, NULL); 104 if (!ASSERT_OK_PTR(d, "btf_dump__new")) 105 goto cleanup; 106 for (i = 1; i < btf__type_cnt(btf3); i++) { 107 err = btf_dump__dump_type(d, i); 108 ASSERT_OK(err, "dump_type_ok"); 109 } 110 fflush(dump_buf_file); 111 dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */ 112 ASSERT_STREQ(dump_buf, 113 "struct s1 {\n" 114 " int f1;\n" 115 "};\n\n" 116 "struct s2 {\n" 117 " struct s1 f1;\n" 118 " int f2;\n" 119 " int *f3;\n" 120 "};\n\n" 121 "union u1 {\n" 122 " struct s2 f1;\n" 123 " int uf2;\n" 124 "};\n\n", "c_dump"); 125 126 cleanup: 127 if (dump_buf_file) 128 fclose(dump_buf_file); 129 free(dump_buf); 130 btf_dump__free(d); 131 btf__free(btf1); 132 btf__free(btf2); 133 if (btf2 != btf3) 134 btf__free(btf3); 135 } 136 137 void test_btf_split(void) 138 { 139 if (test__start_subtest("single_split")) 140 __test_btf_split(false); 141 if (test__start_subtest("multi_split")) 142 __test_btf_split(true); 143 } 144