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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020 Facebook */
   3 #include <test_progs.h>
   4 #include <bpf/btf.h>
   5 #include "btf_helpers.h"
   6
   7 static void gen_btf(struct btf *btf)
   8 {
   9         const struct btf_var_secinfo *vi;
  10         const struct btf_type *t;
  11         const struct btf_member *m;
  12         const struct btf_enum *v;
  13         const struct btf_param *p;
  14         int id, err, str_off;
  15
  16         str_off = btf__find_str(btf, "int");
  17         ASSERT_EQ(str_off, -ENOENT, "int_str_missing_off");
  18
  19         str_off = btf__add_str(btf, "int");
  20         ASSERT_EQ(str_off, 1, "int_str_off");
  21
  22         str_off = btf__find_str(btf, "int");
  23         ASSERT_EQ(str_off, 1, "int_str_found_off");
  24
  25         /* BTF_KIND_INT */
  26         id = btf__add_int(btf, "int", 4,  BTF_INT_SIGNED);
  27         ASSERT_EQ(id, 1, "int_id");
  28
  29         t = btf__type_by_id(btf, 1);
  30         /* should re-use previously added "int" string */
  31         ASSERT_EQ(t->name_off, str_off, "int_name_off");
  32         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "int", "int_name");
  33         ASSERT_EQ(btf_kind(t), BTF_KIND_INT, "int_kind");
  34         ASSERT_EQ(t->size, 4, "int_sz");
  35         ASSERT_EQ(btf_int_encoding(t), BTF_INT_SIGNED, "int_enc");
  36         ASSERT_EQ(btf_int_bits(t), 32, "int_bits");
  37         ASSERT_STREQ(btf_type_raw_dump(btf, 1),
  38                      "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", "raw_dump");
  39
  40         /* invalid int size */
  41         id = btf__add_int(btf, "bad sz int", 7, 0);
  42         ASSERT_ERR(id, "int_bad_sz");
  43         /* invalid encoding */
  44         id = btf__add_int(btf, "bad enc int", 4, 123);
  45         ASSERT_ERR(id, "int_bad_enc");
  46         /* NULL name */
  47         id = btf__add_int(btf, NULL, 4, 0);
  48         ASSERT_ERR(id, "int_bad_null_name");
  49         /* empty name */
  50         id = btf__add_int(btf, "", 4, 0);
  51         ASSERT_ERR(id, "int_bad_empty_name");
  52
  53         /* PTR/CONST/VOLATILE/RESTRICT */
  54         id = btf__add_ptr(btf, 1);
  55         ASSERT_EQ(id, 2, "ptr_id");
  56         t = btf__type_by_id(btf, 2);
  57         ASSERT_EQ(btf_kind(t), BTF_KIND_PTR, "ptr_kind");
  58         ASSERT_EQ(t->type, 1, "ptr_type");
  59         ASSERT_STREQ(btf_type_raw_dump(btf, 2),
  60                      "[2] PTR '(anon)' type_id=1", "raw_dump");
  61
  62         id = btf__add_const(btf, 5); /* points forward to restrict */
  63         ASSERT_EQ(id, 3, "const_id");
  64         t = btf__type_by_id(btf, 3);
  65         ASSERT_EQ(btf_kind(t), BTF_KIND_CONST, "const_kind");
  66         ASSERT_EQ(t->type, 5, "const_type");
  67         ASSERT_STREQ(btf_type_raw_dump(btf, 3),
  68                      "[3] CONST '(anon)' type_id=5", "raw_dump");
  69
  70         id = btf__add_volatile(btf, 3);
  71         ASSERT_EQ(id, 4, "volatile_id");
  72         t = btf__type_by_id(btf, 4);
  73         ASSERT_EQ(btf_kind(t), BTF_KIND_VOLATILE, "volatile_kind");
  74         ASSERT_EQ(t->type, 3, "volatile_type");
  75         ASSERT_STREQ(btf_type_raw_dump(btf, 4),
  76                      "[4] VOLATILE '(anon)' type_id=3", "raw_dump");
  77
  78         id = btf__add_restrict(btf, 4);
  79         ASSERT_EQ(id, 5, "restrict_id");
  80         t = btf__type_by_id(btf, 5);
  81         ASSERT_EQ(btf_kind(t), BTF_KIND_RESTRICT, "restrict_kind");
  82         ASSERT_EQ(t->type, 4, "restrict_type");
  83         ASSERT_STREQ(btf_type_raw_dump(btf, 5),
  84                      "[5] RESTRICT '(anon)' type_id=4", "raw_dump");
  85
  86         /* ARRAY */
  87         id = btf__add_array(btf, 1, 2, 10); /* int *[10] */
  88         ASSERT_EQ(id, 6, "array_id");
  89         t = btf__type_by_id(btf, 6);
  90         ASSERT_EQ(btf_kind(t), BTF_KIND_ARRAY, "array_kind");
  91         ASSERT_EQ(btf_array(t)->index_type, 1, "array_index_type");
  92         ASSERT_EQ(btf_array(t)->type, 2, "array_elem_type");
  93         ASSERT_EQ(btf_array(t)->nelems, 10, "array_nelems");
  94         ASSERT_STREQ(btf_type_raw_dump(btf, 6),
  95                      "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10", "raw_dump");
  96
  97         /* STRUCT */
  98         err = btf__add_field(btf, "field", 1, 0, 0);
  99         ASSERT_ERR(err, "no_struct_field");
 100         id = btf__add_struct(btf, "s1", 8);
 101         ASSERT_EQ(id, 7, "struct_id");
 102         err = btf__add_field(btf, "f1", 1, 0, 0);
 103         ASSERT_OK(err, "f1_res");
 104         err = btf__add_field(btf, "f2", 1, 32, 16);
 105         ASSERT_OK(err, "f2_res");
 106
 107         t = btf__type_by_id(btf, 7);
 108         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "s1", "struct_name");
 109         ASSERT_EQ(btf_kind(t), BTF_KIND_STRUCT, "struct_kind");
 110         ASSERT_EQ(btf_vlen(t), 2, "struct_vlen");
 111         ASSERT_EQ(btf_kflag(t), true, "struct_kflag");
 112         ASSERT_EQ(t->size, 8, "struct_sz");
 113         m = btf_members(t) + 0;
 114         ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
 115         ASSERT_EQ(m->type, 1, "f1_type");
 116         ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
 117         ASSERT_EQ(btf_member_bitfield_size(t, 0), 0, "f1_bit_sz");
 118         m = btf_members(t) + 1;
 119         ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f2", "f2_name");
 120         ASSERT_EQ(m->type, 1, "f2_type");
 121         ASSERT_EQ(btf_member_bit_offset(t, 1), 32, "f2_bit_off");
 122         ASSERT_EQ(btf_member_bitfield_size(t, 1), 16, "f2_bit_sz");
 123         ASSERT_STREQ(btf_type_raw_dump(btf, 7),
 124                      "[7] STRUCT 's1' size=8 vlen=2\n"
 125                      "\t'f1' type_id=1 bits_offset=0\n"
 126                      "\t'f2' type_id=1 bits_offset=32 bitfield_size=16", "raw_dump");
 127
 128         /* UNION */
 129         id = btf__add_union(btf, "u1", 8);
 130         ASSERT_EQ(id, 8, "union_id");
 131
 132         /* invalid, non-zero offset */
 133         err = btf__add_field(btf, "field", 1, 1, 0);
 134         ASSERT_ERR(err, "no_struct_field");
 135
 136         err = btf__add_field(btf, "f1", 1, 0, 16);
 137         ASSERT_OK(err, "f1_res");
 138
 139         t = btf__type_by_id(btf, 8);
 140         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "u1", "union_name");
 141         ASSERT_EQ(btf_kind(t), BTF_KIND_UNION, "union_kind");
 142         ASSERT_EQ(btf_vlen(t), 1, "union_vlen");
 143         ASSERT_EQ(btf_kflag(t), true, "union_kflag");
 144         ASSERT_EQ(t->size, 8, "union_sz");
 145         m = btf_members(t) + 0;
 146         ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
 147         ASSERT_EQ(m->type, 1, "f1_type");
 148         ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
 149         ASSERT_EQ(btf_member_bitfield_size(t, 0), 16, "f1_bit_sz");
 150         ASSERT_STREQ(btf_type_raw_dump(btf, 8),
 151                      "[8] UNION 'u1' size=8 vlen=1\n"
 152                      "\t'f1' type_id=1 bits_offset=0 bitfield_size=16", "raw_dump");
 153
 154         /* ENUM */
 155         id = btf__add_enum(btf, "e1", 4);
 156         ASSERT_EQ(id, 9, "enum_id");
 157         err = btf__add_enum_value(btf, "v1", 1);
 158         ASSERT_OK(err, "v1_res");
 159         err = btf__add_enum_value(btf, "v2", 2);
 160         ASSERT_OK(err, "v2_res");
 161
 162         t = btf__type_by_id(btf, 9);
 163         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum_name");
 164         ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_kind");
 165         ASSERT_EQ(btf_vlen(t), 2, "enum_vlen");
 166         ASSERT_EQ(t->size, 4, "enum_sz");
 167         v = btf_enum(t) + 0;
 168         ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v1", "v1_name");
 169         ASSERT_EQ(v->val, 1, "v1_val");
 170         v = btf_enum(t) + 1;
 171         ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v2", "v2_name");
 172         ASSERT_EQ(v->val, 2, "v2_val");
 173         ASSERT_STREQ(btf_type_raw_dump(btf, 9),
 174                      "[9] ENUM 'e1' size=4 vlen=2\n"
 175                      "\t'v1' val=1\n"
 176                      "\t'v2' val=2", "raw_dump");
 177
 178         /* FWDs */
 179         id = btf__add_fwd(btf, "struct_fwd", BTF_FWD_STRUCT);
 180         ASSERT_EQ(id, 10, "struct_fwd_id");
 181         t = btf__type_by_id(btf, 10);
 182         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "struct_fwd", "fwd_name");
 183         ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
 184         ASSERT_EQ(btf_kflag(t), 0, "fwd_kflag");
 185         ASSERT_STREQ(btf_type_raw_dump(btf, 10),
 186                      "[10] FWD 'struct_fwd' fwd_kind=struct", "raw_dump");
 187
 188         id = btf__add_fwd(btf, "union_fwd", BTF_FWD_UNION);
 189         ASSERT_EQ(id, 11, "union_fwd_id");
 190         t = btf__type_by_id(btf, 11);
 191         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "union_fwd", "fwd_name");
 192         ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
 193         ASSERT_EQ(btf_kflag(t), 1, "fwd_kflag");
 194         ASSERT_STREQ(btf_type_raw_dump(btf, 11),
 195                      "[11] FWD 'union_fwd' fwd_kind=union", "raw_dump");
 196
 197         id = btf__add_fwd(btf, "enum_fwd", BTF_FWD_ENUM);
 198         ASSERT_EQ(id, 12, "enum_fwd_id");
 199         t = btf__type_by_id(btf, 12);
 200         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "enum_fwd", "fwd_name");
 201         ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_fwd_kind");
 202         ASSERT_EQ(btf_vlen(t), 0, "enum_fwd_kind");
 203         ASSERT_EQ(t->size, 4, "enum_fwd_sz");
 204         ASSERT_STREQ(btf_type_raw_dump(btf, 12),
 205                      "[12] ENUM 'enum_fwd' size=4 vlen=0", "raw_dump");
 206
 207         /* TYPEDEF */
 208         id = btf__add_typedef(btf, "typedef1", 1);
 209         ASSERT_EQ(id, 13, "typedef_fwd_id");
 210         t = btf__type_by_id(btf, 13);
 211         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "typedef1", "typedef_name");
 212         ASSERT_EQ(btf_kind(t), BTF_KIND_TYPEDEF, "typedef_kind");
 213         ASSERT_EQ(t->type, 1, "typedef_type");
 214         ASSERT_STREQ(btf_type_raw_dump(btf, 13),
 215                      "[13] TYPEDEF 'typedef1' type_id=1", "raw_dump");
 216
 217         /* FUNC & FUNC_PROTO */
 218         id = btf__add_func(btf, "func1", BTF_FUNC_GLOBAL, 15);
 219         ASSERT_EQ(id, 14, "func_id");
 220         t = btf__type_by_id(btf, 14);
 221         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "func1", "func_name");
 222         ASSERT_EQ(t->type, 15, "func_type");
 223         ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC, "func_kind");
 224         ASSERT_EQ(btf_vlen(t), BTF_FUNC_GLOBAL, "func_vlen");
 225         ASSERT_STREQ(btf_type_raw_dump(btf, 14),
 226                      "[14] FUNC 'func1' type_id=15 linkage=global", "raw_dump");
 227
 228         id = btf__add_func_proto(btf, 1);
 229         ASSERT_EQ(id, 15, "func_proto_id");
 230         err = btf__add_func_param(btf, "p1", 1);
 231         ASSERT_OK(err, "p1_res");
 232         err = btf__add_func_param(btf, "p2", 2);
 233         ASSERT_OK(err, "p2_res");
 234
 235         t = btf__type_by_id(btf, 15);
 236         ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC_PROTO, "func_proto_kind");
 237         ASSERT_EQ(btf_vlen(t), 2, "func_proto_vlen");
 238         ASSERT_EQ(t->type, 1, "func_proto_ret_type");
 239         p = btf_params(t) + 0;
 240         ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p1", "p1_name");
 241         ASSERT_EQ(p->type, 1, "p1_type");
 242         p = btf_params(t) + 1;
 243         ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p2", "p2_name");
 244         ASSERT_EQ(p->type, 2, "p2_type");
 245         ASSERT_STREQ(btf_type_raw_dump(btf, 15),
 246                      "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
 247                      "\t'p1' type_id=1\n"
 248                      "\t'p2' type_id=2", "raw_dump");
 249
 250         /* VAR */
 251         id = btf__add_var(btf, "var1", BTF_VAR_GLOBAL_ALLOCATED, 1);
 252         ASSERT_EQ(id, 16, "var_id");
 253         t = btf__type_by_id(btf, 16);
 254         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "var1", "var_name");
 255         ASSERT_EQ(btf_kind(t), BTF_KIND_VAR, "var_kind");
 256         ASSERT_EQ(t->type, 1, "var_type");
 257         ASSERT_EQ(btf_var(t)->linkage, BTF_VAR_GLOBAL_ALLOCATED, "var_type");
 258         ASSERT_STREQ(btf_type_raw_dump(btf, 16),
 259                      "[16] VAR 'var1' type_id=1, linkage=global-alloc", "raw_dump");
 260
 261         /* DATASECT */
 262         id = btf__add_datasec(btf, "datasec1", 12);
 263         ASSERT_EQ(id, 17, "datasec_id");
 264         err = btf__add_datasec_var_info(btf, 1, 4, 8);
 265         ASSERT_OK(err, "v1_res");
 266
 267         t = btf__type_by_id(btf, 17);
 268         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "datasec1", "datasec_name");
 269         ASSERT_EQ(t->size, 12, "datasec_sz");
 270         ASSERT_EQ(btf_kind(t), BTF_KIND_DATASEC, "datasec_kind");
 271         ASSERT_EQ(btf_vlen(t), 1, "datasec_vlen");
 272         vi = btf_var_secinfos(t) + 0;
 273         ASSERT_EQ(vi->type, 1, "v1_type");
 274         ASSERT_EQ(vi->offset, 4, "v1_off");
 275         ASSERT_EQ(vi->size, 8, "v1_sz");
 276         ASSERT_STREQ(btf_type_raw_dump(btf, 17),
 277                      "[17] DATASEC 'datasec1' size=12 vlen=1\n"
 278                      "\ttype_id=1 offset=4 size=8", "raw_dump");
 279
 280         /* DECL_TAG */
 281         id = btf__add_decl_tag(btf, "tag1", 16, -1);
 282         ASSERT_EQ(id, 18, "tag_id");
 283         t = btf__type_by_id(btf, 18);
 284         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
 285         ASSERT_EQ(btf_kind(t), BTF_KIND_DECL_TAG, "tag_kind");
 286         ASSERT_EQ(t->type, 16, "tag_type");
 287         ASSERT_EQ(btf_decl_tag(t)->component_idx, -1, "tag_component_idx");
 288         ASSERT_STREQ(btf_type_raw_dump(btf, 18),
 289                      "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1", "raw_dump");
 290
 291         id = btf__add_decl_tag(btf, "tag2", 14, 1);
 292         ASSERT_EQ(id, 19, "tag_id");
 293         t = btf__type_by_id(btf, 19);
 294         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag2", "tag_value");
 295         ASSERT_EQ(btf_kind(t), BTF_KIND_DECL_TAG, "tag_kind");
 296         ASSERT_EQ(t->type, 14, "tag_type");
 297         ASSERT_EQ(btf_decl_tag(t)->component_idx, 1, "tag_component_idx");
 298         ASSERT_STREQ(btf_type_raw_dump(btf, 19),
 299                      "[19] DECL_TAG 'tag2' type_id=14 component_idx=1", "raw_dump");
 300
 301         /* TYPE_TAG */
 302         id = btf__add_type_tag(btf, "tag1", 1);
 303         ASSERT_EQ(id, 20, "tag_id");
 304         t = btf__type_by_id(btf, 20);
 305         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
 306         ASSERT_EQ(btf_kind(t), BTF_KIND_TYPE_TAG, "tag_kind");
 307         ASSERT_EQ(t->type, 1, "tag_type");
 308         ASSERT_STREQ(btf_type_raw_dump(btf, 20),
 309                      "[20] TYPE_TAG 'tag1' type_id=1", "raw_dump");
 310 }
 311
 312 static void test_btf_add()
 313 {
 314         struct btf *btf;
 315
 316         btf = btf__new_empty();
 317         if (!ASSERT_OK_PTR(btf, "new_empty"))
 318                 return;
 319
 320         gen_btf(btf);
 321
 322         VALIDATE_RAW_BTF(
 323                 btf,
 324                 "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
 325                 "[2] PTR '(anon)' type_id=1",
 326                 "[3] CONST '(anon)' type_id=5",
 327                 "[4] VOLATILE '(anon)' type_id=3",
 328                 "[5] RESTRICT '(anon)' type_id=4",
 329                 "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
 330                 "[7] STRUCT 's1' size=8 vlen=2\n"
 331                 "\t'f1' type_id=1 bits_offset=0\n"
 332                 "\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
 333                 "[8] UNION 'u1' size=8 vlen=1\n"
 334                 "\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
 335                 "[9] ENUM 'e1' size=4 vlen=2\n"
 336                 "\t'v1' val=1\n"
 337                 "\t'v2' val=2",
 338                 "[10] FWD 'struct_fwd' fwd_kind=struct",
 339                 "[11] FWD 'union_fwd' fwd_kind=union",
 340                 "[12] ENUM 'enum_fwd' size=4 vlen=0",
 341                 "[13] TYPEDEF 'typedef1' type_id=1",
 342                 "[14] FUNC 'func1' type_id=15 linkage=global",
 343                 "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
 344                 "\t'p1' type_id=1\n"
 345                 "\t'p2' type_id=2",
 346                 "[16] VAR 'var1' type_id=1, linkage=global-alloc",
 347                 "[17] DATASEC 'datasec1' size=12 vlen=1\n"
 348                 "\ttype_id=1 offset=4 size=8",
 349                 "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
 350                 "[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
 351                 "[20] TYPE_TAG 'tag1' type_id=1");
 352
 353         btf__free(btf);
 354 }
 355
 356 static void test_btf_add_btf()
 357 {
 358         struct btf *btf1 = NULL, *btf2 = NULL;
 359         int id;
 360
 361         btf1 = btf__new_empty();
 362         if (!ASSERT_OK_PTR(btf1, "btf1"))
 363                 return;
 364
 365         btf2 = btf__new_empty();
 366         if (!ASSERT_OK_PTR(btf2, "btf2"))
 367                 goto cleanup;
 368
 369         gen_btf(btf1);
 370         gen_btf(btf2);
 371
 372         id = btf__add_btf(btf1, btf2);
 373         if (!ASSERT_EQ(id, 21, "id"))
 374                 goto cleanup;
 375
 376         VALIDATE_RAW_BTF(
 377                 btf1,
 378                 "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
 379                 "[2] PTR '(anon)' type_id=1",
 380                 "[3] CONST '(anon)' type_id=5",
 381                 "[4] VOLATILE '(anon)' type_id=3",
 382                 "[5] RESTRICT '(anon)' type_id=4",
 383                 "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
 384                 "[7] STRUCT 's1' size=8 vlen=2\n"
 385                 "\t'f1' type_id=1 bits_offset=0\n"
 386                 "\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
 387                 "[8] UNION 'u1' size=8 vlen=1\n"
 388                 "\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
 389                 "[9] ENUM 'e1' size=4 vlen=2\n"
 390                 "\t'v1' val=1\n"
 391                 "\t'v2' val=2",
 392                 "[10] FWD 'struct_fwd' fwd_kind=struct",
 393                 "[11] FWD 'union_fwd' fwd_kind=union",
 394                 "[12] ENUM 'enum_fwd' size=4 vlen=0",
 395                 "[13] TYPEDEF 'typedef1' type_id=1",
 396                 "[14] FUNC 'func1' type_id=15 linkage=global",
 397                 "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
 398                 "\t'p1' type_id=1\n"
 399                 "\t'p2' type_id=2",
 400                 "[16] VAR 'var1' type_id=1, linkage=global-alloc",
 401                 "[17] DATASEC 'datasec1' size=12 vlen=1\n"
 402                 "\ttype_id=1 offset=4 size=8",
 403                 "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
 404                 "[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
 405                 "[20] TYPE_TAG 'tag1' type_id=1",
 406
 407                 /* types appended from the second BTF */
 408                 "[21] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
 409                 "[22] PTR '(anon)' type_id=21",
 410                 "[23] CONST '(anon)' type_id=25",
 411                 "[24] VOLATILE '(anon)' type_id=23",
 412                 "[25] RESTRICT '(anon)' type_id=24",
 413                 "[26] ARRAY '(anon)' type_id=22 index_type_id=21 nr_elems=10",
 414                 "[27] STRUCT 's1' size=8 vlen=2\n"
 415                 "\t'f1' type_id=21 bits_offset=0\n"
 416                 "\t'f2' type_id=21 bits_offset=32 bitfield_size=16",
 417                 "[28] UNION 'u1' size=8 vlen=1\n"
 418                 "\t'f1' type_id=21 bits_offset=0 bitfield_size=16",
 419                 "[29] ENUM 'e1' size=4 vlen=2\n"
 420                 "\t'v1' val=1\n"
 421                 "\t'v2' val=2",
 422                 "[30] FWD 'struct_fwd' fwd_kind=struct",
 423                 "[31] FWD 'union_fwd' fwd_kind=union",
 424                 "[32] ENUM 'enum_fwd' size=4 vlen=0",
 425                 "[33] TYPEDEF 'typedef1' type_id=21",
 426                 "[34] FUNC 'func1' type_id=35 linkage=global",
 427                 "[35] FUNC_PROTO '(anon)' ret_type_id=21 vlen=2\n"
 428                 "\t'p1' type_id=21\n"
 429                 "\t'p2' type_id=22",
 430                 "[36] VAR 'var1' type_id=21, linkage=global-alloc",
 431                 "[37] DATASEC 'datasec1' size=12 vlen=1\n"
 432                 "\ttype_id=21 offset=4 size=8",
 433                 "[38] DECL_TAG 'tag1' type_id=36 component_idx=-1",
 434                 "[39] DECL_TAG 'tag2' type_id=34 component_idx=1",
 435                 "[40] TYPE_TAG 'tag1' type_id=21");
 436
 437 cleanup:
 438         btf__free(btf1);
 439         btf__free(btf2);
 440 }
 441
 442 void test_btf_write()
 443 {
 444         if (test__start_subtest("btf_add"))
 445                 test_btf_add();
 446         if (test__start_subtest("btf_add_btf"))
 447                 test_btf_add_btf();
 448 }