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_enum64 *v64;
  13         const struct btf_enum *v;
  14         const struct btf_param *p;
  15         int id, err, str_off;
  16
  17         str_off = btf__find_str(btf, "int");
  18         ASSERT_EQ(str_off, -ENOENT, "int_str_missing_off");
  19
  20         str_off = btf__add_str(btf, "int");
  21         ASSERT_EQ(str_off, 1, "int_str_off");
  22
  23         str_off = btf__find_str(btf, "int");
  24         ASSERT_EQ(str_off, 1, "int_str_found_off");
  25
  26         /* BTF_KIND_INT */
  27         id = btf__add_int(btf, "int", 4,  BTF_INT_SIGNED);
  28         ASSERT_EQ(id, 1, "int_id");
  29
  30         t = btf__type_by_id(btf, 1);
  31         /* should re-use previously added "int" string */
  32         ASSERT_EQ(t->name_off, str_off, "int_name_off");
  33         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "int", "int_name");
  34         ASSERT_EQ(btf_kind(t), BTF_KIND_INT, "int_kind");
  35         ASSERT_EQ(t->size, 4, "int_sz");
  36         ASSERT_EQ(btf_int_encoding(t), BTF_INT_SIGNED, "int_enc");
  37         ASSERT_EQ(btf_int_bits(t), 32, "int_bits");
  38         ASSERT_STREQ(btf_type_raw_dump(btf, 1),
  39                      "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", "raw_dump");
  40
  41         /* invalid int size */
  42         id = btf__add_int(btf, "bad sz int", 7, 0);
  43         ASSERT_ERR(id, "int_bad_sz");
  44         /* invalid encoding */
  45         id = btf__add_int(btf, "bad enc int", 4, 123);
  46         ASSERT_ERR(id, "int_bad_enc");
  47         /* NULL name */
  48         id = btf__add_int(btf, NULL, 4, 0);
  49         ASSERT_ERR(id, "int_bad_null_name");
  50         /* empty name */
  51         id = btf__add_int(btf, "", 4, 0);
  52         ASSERT_ERR(id, "int_bad_empty_name");
  53
  54         /* PTR/CONST/VOLATILE/RESTRICT */
  55         id = btf__add_ptr(btf, 1);
  56         ASSERT_EQ(id, 2, "ptr_id");
  57         t = btf__type_by_id(btf, 2);
  58         ASSERT_EQ(btf_kind(t), BTF_KIND_PTR, "ptr_kind");
  59         ASSERT_EQ(t->type, 1, "ptr_type");
  60         ASSERT_STREQ(btf_type_raw_dump(btf, 2),
  61                      "[2] PTR '(anon)' type_id=1", "raw_dump");
  62
  63         id = btf__add_const(btf, 5); /* points forward to restrict */
  64         ASSERT_EQ(id, 3, "const_id");
  65         t = btf__type_by_id(btf, 3);
  66         ASSERT_EQ(btf_kind(t), BTF_KIND_CONST, "const_kind");
  67         ASSERT_EQ(t->type, 5, "const_type");
  68         ASSERT_STREQ(btf_type_raw_dump(btf, 3),
  69                      "[3] CONST '(anon)' type_id=5", "raw_dump");
  70
  71         id = btf__add_volatile(btf, 3);
  72         ASSERT_EQ(id, 4, "volatile_id");
  73         t = btf__type_by_id(btf, 4);
  74         ASSERT_EQ(btf_kind(t), BTF_KIND_VOLATILE, "volatile_kind");
  75         ASSERT_EQ(t->type, 3, "volatile_type");
  76         ASSERT_STREQ(btf_type_raw_dump(btf, 4),
  77                      "[4] VOLATILE '(anon)' type_id=3", "raw_dump");
  78
  79         id = btf__add_restrict(btf, 4);
  80         ASSERT_EQ(id, 5, "restrict_id");
  81         t = btf__type_by_id(btf, 5);
  82         ASSERT_EQ(btf_kind(t), BTF_KIND_RESTRICT, "restrict_kind");
  83         ASSERT_EQ(t->type, 4, "restrict_type");
  84         ASSERT_STREQ(btf_type_raw_dump(btf, 5),
  85                      "[5] RESTRICT '(anon)' type_id=4", "raw_dump");
  86
  87         /* ARRAY */
  88         id = btf__add_array(btf, 1, 2, 10); /* int *[10] */
  89         ASSERT_EQ(id, 6, "array_id");
  90         t = btf__type_by_id(btf, 6);
  91         ASSERT_EQ(btf_kind(t), BTF_KIND_ARRAY, "array_kind");
  92         ASSERT_EQ(btf_array(t)->index_type, 1, "array_index_type");
  93         ASSERT_EQ(btf_array(t)->type, 2, "array_elem_type");
  94         ASSERT_EQ(btf_array(t)->nelems, 10, "array_nelems");
  95         ASSERT_STREQ(btf_type_raw_dump(btf, 6),
  96                      "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10", "raw_dump");
  97
  98         /* STRUCT */
  99         err = btf__add_field(btf, "field", 1, 0, 0);
 100         ASSERT_ERR(err, "no_struct_field");
 101         id = btf__add_struct(btf, "s1", 8);
 102         ASSERT_EQ(id, 7, "struct_id");
 103         err = btf__add_field(btf, "f1", 1, 0, 0);
 104         ASSERT_OK(err, "f1_res");
 105         err = btf__add_field(btf, "f2", 1, 32, 16);
 106         ASSERT_OK(err, "f2_res");
 107
 108         t = btf__type_by_id(btf, 7);
 109         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "s1", "struct_name");
 110         ASSERT_EQ(btf_kind(t), BTF_KIND_STRUCT, "struct_kind");
 111         ASSERT_EQ(btf_vlen(t), 2, "struct_vlen");
 112         ASSERT_EQ(btf_kflag(t), true, "struct_kflag");
 113         ASSERT_EQ(t->size, 8, "struct_sz");
 114         m = btf_members(t) + 0;
 115         ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
 116         ASSERT_EQ(m->type, 1, "f1_type");
 117         ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
 118         ASSERT_EQ(btf_member_bitfield_size(t, 0), 0, "f1_bit_sz");
 119         m = btf_members(t) + 1;
 120         ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f2", "f2_name");
 121         ASSERT_EQ(m->type, 1, "f2_type");
 122         ASSERT_EQ(btf_member_bit_offset(t, 1), 32, "f2_bit_off");
 123         ASSERT_EQ(btf_member_bitfield_size(t, 1), 16, "f2_bit_sz");
 124         ASSERT_STREQ(btf_type_raw_dump(btf, 7),
 125                      "[7] STRUCT 's1' size=8 vlen=2\n"
 126                      "\t'f1' type_id=1 bits_offset=0\n"
 127                      "\t'f2' type_id=1 bits_offset=32 bitfield_size=16", "raw_dump");
 128
 129         /* UNION */
 130         id = btf__add_union(btf, "u1", 8);
 131         ASSERT_EQ(id, 8, "union_id");
 132
 133         /* invalid, non-zero offset */
 134         err = btf__add_field(btf, "field", 1, 1, 0);
 135         ASSERT_ERR(err, "no_struct_field");
 136
 137         err = btf__add_field(btf, "f1", 1, 0, 16);
 138         ASSERT_OK(err, "f1_res");
 139
 140         t = btf__type_by_id(btf, 8);
 141         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "u1", "union_name");
 142         ASSERT_EQ(btf_kind(t), BTF_KIND_UNION, "union_kind");
 143         ASSERT_EQ(btf_vlen(t), 1, "union_vlen");
 144         ASSERT_EQ(btf_kflag(t), true, "union_kflag");
 145         ASSERT_EQ(t->size, 8, "union_sz");
 146         m = btf_members(t) + 0;
 147         ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
 148         ASSERT_EQ(m->type, 1, "f1_type");
 149         ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
 150         ASSERT_EQ(btf_member_bitfield_size(t, 0), 16, "f1_bit_sz");
 151         ASSERT_STREQ(btf_type_raw_dump(btf, 8),
 152                      "[8] UNION 'u1' size=8 vlen=1\n"
 153                      "\t'f1' type_id=1 bits_offset=0 bitfield_size=16", "raw_dump");
 154
 155         /* ENUM */
 156         id = btf__add_enum(btf, "e1", 4);
 157         ASSERT_EQ(id, 9, "enum_id");
 158         err = btf__add_enum_value(btf, "v1", 1);
 159         ASSERT_OK(err, "v1_res");
 160         err = btf__add_enum_value(btf, "v2", 2);
 161         ASSERT_OK(err, "v2_res");
 162
 163         t = btf__type_by_id(btf, 9);
 164         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum_name");
 165         ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_kind");
 166         ASSERT_EQ(btf_vlen(t), 2, "enum_vlen");
 167         ASSERT_EQ(t->size, 4, "enum_sz");
 168         v = btf_enum(t) + 0;
 169         ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v1", "v1_name");
 170         ASSERT_EQ(v->val, 1, "v1_val");
 171         v = btf_enum(t) + 1;
 172         ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v2", "v2_name");
 173         ASSERT_EQ(v->val, 2, "v2_val");
 174         ASSERT_STREQ(btf_type_raw_dump(btf, 9),
 175                      "[9] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
 176                      "\t'v1' val=1\n"
 177                      "\t'v2' val=2", "raw_dump");
 178
 179         /* FWDs */
 180         id = btf__add_fwd(btf, "struct_fwd", BTF_FWD_STRUCT);
 181         ASSERT_EQ(id, 10, "struct_fwd_id");
 182         t = btf__type_by_id(btf, 10);
 183         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "struct_fwd", "fwd_name");
 184         ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
 185         ASSERT_EQ(btf_kflag(t), 0, "fwd_kflag");
 186         ASSERT_STREQ(btf_type_raw_dump(btf, 10),
 187                      "[10] FWD 'struct_fwd' fwd_kind=struct", "raw_dump");
 188
 189         id = btf__add_fwd(btf, "union_fwd", BTF_FWD_UNION);
 190         ASSERT_EQ(id, 11, "union_fwd_id");
 191         t = btf__type_by_id(btf, 11);
 192         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "union_fwd", "fwd_name");
 193         ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
 194         ASSERT_EQ(btf_kflag(t), 1, "fwd_kflag");
 195         ASSERT_STREQ(btf_type_raw_dump(btf, 11),
 196                      "[11] FWD 'union_fwd' fwd_kind=union", "raw_dump");
 197
 198         id = btf__add_fwd(btf, "enum_fwd", BTF_FWD_ENUM);
 199         ASSERT_EQ(id, 12, "enum_fwd_id");
 200         t = btf__type_by_id(btf, 12);
 201         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "enum_fwd", "fwd_name");
 202         ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_fwd_kind");
 203         ASSERT_EQ(btf_vlen(t), 0, "enum_fwd_kind");
 204         ASSERT_EQ(t->size, 4, "enum_fwd_sz");
 205         ASSERT_STREQ(btf_type_raw_dump(btf, 12),
 206                      "[12] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0", "raw_dump");
 207
 208         /* TYPEDEF */
 209         id = btf__add_typedef(btf, "typedef1", 1);
 210         ASSERT_EQ(id, 13, "typedef_fwd_id");
 211         t = btf__type_by_id(btf, 13);
 212         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "typedef1", "typedef_name");
 213         ASSERT_EQ(btf_kind(t), BTF_KIND_TYPEDEF, "typedef_kind");
 214         ASSERT_EQ(t->type, 1, "typedef_type");
 215         ASSERT_STREQ(btf_type_raw_dump(btf, 13),
 216                      "[13] TYPEDEF 'typedef1' type_id=1", "raw_dump");
 217
 218         /* FUNC & FUNC_PROTO */
 219         id = btf__add_func(btf, "func1", BTF_FUNC_GLOBAL, 15);
 220         ASSERT_EQ(id, 14, "func_id");
 221         t = btf__type_by_id(btf, 14);
 222         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "func1", "func_name");
 223         ASSERT_EQ(t->type, 15, "func_type");
 224         ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC, "func_kind");
 225         ASSERT_EQ(btf_vlen(t), BTF_FUNC_GLOBAL, "func_vlen");
 226         ASSERT_STREQ(btf_type_raw_dump(btf, 14),
 227                      "[14] FUNC 'func1' type_id=15 linkage=global", "raw_dump");
 228
 229         id = btf__add_func_proto(btf, 1);
 230         ASSERT_EQ(id, 15, "func_proto_id");
 231         err = btf__add_func_param(btf, "p1", 1);
 232         ASSERT_OK(err, "p1_res");
 233         err = btf__add_func_param(btf, "p2", 2);
 234         ASSERT_OK(err, "p2_res");
 235
 236         t = btf__type_by_id(btf, 15);
 237         ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC_PROTO, "func_proto_kind");
 238         ASSERT_EQ(btf_vlen(t), 2, "func_proto_vlen");
 239         ASSERT_EQ(t->type, 1, "func_proto_ret_type");
 240         p = btf_params(t) + 0;
 241         ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p1", "p1_name");
 242         ASSERT_EQ(p->type, 1, "p1_type");
 243         p = btf_params(t) + 1;
 244         ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p2", "p2_name");
 245         ASSERT_EQ(p->type, 2, "p2_type");
 246         ASSERT_STREQ(btf_type_raw_dump(btf, 15),
 247                      "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
 248                      "\t'p1' type_id=1\n"
 249                      "\t'p2' type_id=2", "raw_dump");
 250
 251         /* VAR */
 252         id = btf__add_var(btf, "var1", BTF_VAR_GLOBAL_ALLOCATED, 1);
 253         ASSERT_EQ(id, 16, "var_id");
 254         t = btf__type_by_id(btf, 16);
 255         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "var1", "var_name");
 256         ASSERT_EQ(btf_kind(t), BTF_KIND_VAR, "var_kind");
 257         ASSERT_EQ(t->type, 1, "var_type");
 258         ASSERT_EQ(btf_var(t)->linkage, BTF_VAR_GLOBAL_ALLOCATED, "var_type");
 259         ASSERT_STREQ(btf_type_raw_dump(btf, 16),
 260                      "[16] VAR 'var1' type_id=1, linkage=global-alloc", "raw_dump");
 261
 262         /* DATASECT */
 263         id = btf__add_datasec(btf, "datasec1", 12);
 264         ASSERT_EQ(id, 17, "datasec_id");
 265         err = btf__add_datasec_var_info(btf, 1, 4, 8);
 266         ASSERT_OK(err, "v1_res");
 267
 268         t = btf__type_by_id(btf, 17);
 269         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "datasec1", "datasec_name");
 270         ASSERT_EQ(t->size, 12, "datasec_sz");
 271         ASSERT_EQ(btf_kind(t), BTF_KIND_DATASEC, "datasec_kind");
 272         ASSERT_EQ(btf_vlen(t), 1, "datasec_vlen");
 273         vi = btf_var_secinfos(t) + 0;
 274         ASSERT_EQ(vi->type, 1, "v1_type");
 275         ASSERT_EQ(vi->offset, 4, "v1_off");
 276         ASSERT_EQ(vi->size, 8, "v1_sz");
 277         ASSERT_STREQ(btf_type_raw_dump(btf, 17),
 278                      "[17] DATASEC 'datasec1' size=12 vlen=1\n"
 279                      "\ttype_id=1 offset=4 size=8", "raw_dump");
 280
 281         /* DECL_TAG */
 282         id = btf__add_decl_tag(btf, "tag1", 16, -1);
 283         ASSERT_EQ(id, 18, "tag_id");
 284         t = btf__type_by_id(btf, 18);
 285         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
 286         ASSERT_EQ(btf_kind(t), BTF_KIND_DECL_TAG, "tag_kind");
 287         ASSERT_EQ(t->type, 16, "tag_type");
 288         ASSERT_EQ(btf_decl_tag(t)->component_idx, -1, "tag_component_idx");
 289         ASSERT_STREQ(btf_type_raw_dump(btf, 18),
 290                      "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1", "raw_dump");
 291
 292         id = btf__add_decl_tag(btf, "tag2", 14, 1);
 293         ASSERT_EQ(id, 19, "tag_id");
 294         t = btf__type_by_id(btf, 19);
 295         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag2", "tag_value");
 296         ASSERT_EQ(btf_kind(t), BTF_KIND_DECL_TAG, "tag_kind");
 297         ASSERT_EQ(t->type, 14, "tag_type");
 298         ASSERT_EQ(btf_decl_tag(t)->component_idx, 1, "tag_component_idx");
 299         ASSERT_STREQ(btf_type_raw_dump(btf, 19),
 300                      "[19] DECL_TAG 'tag2' type_id=14 component_idx=1", "raw_dump");
 301
 302         /* TYPE_TAG */
 303         id = btf__add_type_tag(btf, "tag1", 1);
 304         ASSERT_EQ(id, 20, "tag_id");
 305         t = btf__type_by_id(btf, 20);
 306         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
 307         ASSERT_EQ(btf_kind(t), BTF_KIND_TYPE_TAG, "tag_kind");
 308         ASSERT_EQ(t->type, 1, "tag_type");
 309         ASSERT_STREQ(btf_type_raw_dump(btf, 20),
 310                      "[20] TYPE_TAG 'tag1' type_id=1", "raw_dump");
 311
 312         /* ENUM64 */
 313         id = btf__add_enum64(btf, "e1", 8, true);
 314         ASSERT_EQ(id, 21, "enum64_id");
 315         err = btf__add_enum64_value(btf, "v1", -1);
 316         ASSERT_OK(err, "v1_res");
 317         err = btf__add_enum64_value(btf, "v2", 0x123456789); /* 4886718345 */
 318         ASSERT_OK(err, "v2_res");
 319         t = btf__type_by_id(btf, 21);
 320         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum64_name");
 321         ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM64, "enum64_kind");
 322         ASSERT_EQ(btf_vlen(t), 2, "enum64_vlen");
 323         ASSERT_EQ(t->size, 8, "enum64_sz");
 324         v64 = btf_enum64(t) + 0;
 325         ASSERT_STREQ(btf__str_by_offset(btf, v64->name_off), "v1", "v1_name");
 326         ASSERT_EQ(v64->val_hi32, 0xffffffff, "v1_val");
 327         ASSERT_EQ(v64->val_lo32, 0xffffffff, "v1_val");
 328         v64 = btf_enum64(t) + 1;
 329         ASSERT_STREQ(btf__str_by_offset(btf, v64->name_off), "v2", "v2_name");
 330         ASSERT_EQ(v64->val_hi32, 0x1, "v2_val");
 331         ASSERT_EQ(v64->val_lo32, 0x23456789, "v2_val");
 332         ASSERT_STREQ(btf_type_raw_dump(btf, 21),
 333                      "[21] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
 334                      "\t'v1' val=-1\n"
 335                      "\t'v2' val=4886718345", "raw_dump");
 336
 337         id = btf__add_enum64(btf, "e1", 8, false);
 338         ASSERT_EQ(id, 22, "enum64_id");
 339         err = btf__add_enum64_value(btf, "v1", 0xffffffffFFFFFFFF); /* 18446744073709551615 */
 340         ASSERT_OK(err, "v1_res");
 341         t = btf__type_by_id(btf, 22);
 342         ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum64_name");
 343         ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM64, "enum64_kind");
 344         ASSERT_EQ(btf_vlen(t), 1, "enum64_vlen");
 345         ASSERT_EQ(t->size, 8, "enum64_sz");
 346         v64 = btf_enum64(t) + 0;
 347         ASSERT_STREQ(btf__str_by_offset(btf, v64->name_off), "v1", "v1_name");
 348         ASSERT_EQ(v64->val_hi32, 0xffffffff, "v1_val");
 349         ASSERT_EQ(v64->val_lo32, 0xffffffff, "v1_val");
 350         ASSERT_STREQ(btf_type_raw_dump(btf, 22),
 351                      "[22] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
 352                      "\t'v1' val=18446744073709551615", "raw_dump");
 353 }
 354
 355 static void test_btf_add()
 356 {
 357         struct btf *btf;
 358
 359         btf = btf__new_empty();
 360         if (!ASSERT_OK_PTR(btf, "new_empty"))
 361                 return;
 362
 363         gen_btf(btf);
 364
 365         VALIDATE_RAW_BTF(
 366                 btf,
 367                 "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
 368                 "[2] PTR '(anon)' type_id=1",
 369                 "[3] CONST '(anon)' type_id=5",
 370                 "[4] VOLATILE '(anon)' type_id=3",
 371                 "[5] RESTRICT '(anon)' type_id=4",
 372                 "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
 373                 "[7] STRUCT 's1' size=8 vlen=2\n"
 374                 "\t'f1' type_id=1 bits_offset=0\n"
 375                 "\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
 376                 "[8] UNION 'u1' size=8 vlen=1\n"
 377                 "\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
 378                 "[9] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
 379                 "\t'v1' val=1\n"
 380                 "\t'v2' val=2",
 381                 "[10] FWD 'struct_fwd' fwd_kind=struct",
 382                 "[11] FWD 'union_fwd' fwd_kind=union",
 383                 "[12] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0",
 384                 "[13] TYPEDEF 'typedef1' type_id=1",
 385                 "[14] FUNC 'func1' type_id=15 linkage=global",
 386                 "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
 387                 "\t'p1' type_id=1\n"
 388                 "\t'p2' type_id=2",
 389                 "[16] VAR 'var1' type_id=1, linkage=global-alloc",
 390                 "[17] DATASEC 'datasec1' size=12 vlen=1\n"
 391                 "\ttype_id=1 offset=4 size=8",
 392                 "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
 393                 "[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
 394                 "[20] TYPE_TAG 'tag1' type_id=1",
 395                 "[21] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
 396                 "\t'v1' val=-1\n"
 397                 "\t'v2' val=4886718345",
 398                 "[22] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
 399                 "\t'v1' val=18446744073709551615");
 400
 401         btf__free(btf);
 402 }
 403
 404 static void test_btf_add_btf()
 405 {
 406         struct btf *btf1 = NULL, *btf2 = NULL;
 407         int id;
 408
 409         btf1 = btf__new_empty();
 410         if (!ASSERT_OK_PTR(btf1, "btf1"))
 411                 return;
 412
 413         btf2 = btf__new_empty();
 414         if (!ASSERT_OK_PTR(btf2, "btf2"))
 415                 goto cleanup;
 416
 417         gen_btf(btf1);
 418         gen_btf(btf2);
 419
 420         id = btf__add_btf(btf1, btf2);
 421         if (!ASSERT_EQ(id, 23, "id"))
 422                 goto cleanup;
 423
 424         VALIDATE_RAW_BTF(
 425                 btf1,
 426                 "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
 427                 "[2] PTR '(anon)' type_id=1",
 428                 "[3] CONST '(anon)' type_id=5",
 429                 "[4] VOLATILE '(anon)' type_id=3",
 430                 "[5] RESTRICT '(anon)' type_id=4",
 431                 "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
 432                 "[7] STRUCT 's1' size=8 vlen=2\n"
 433                 "\t'f1' type_id=1 bits_offset=0\n"
 434                 "\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
 435                 "[8] UNION 'u1' size=8 vlen=1\n"
 436                 "\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
 437                 "[9] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
 438                 "\t'v1' val=1\n"
 439                 "\t'v2' val=2",
 440                 "[10] FWD 'struct_fwd' fwd_kind=struct",
 441                 "[11] FWD 'union_fwd' fwd_kind=union",
 442                 "[12] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0",
 443                 "[13] TYPEDEF 'typedef1' type_id=1",
 444                 "[14] FUNC 'func1' type_id=15 linkage=global",
 445                 "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
 446                 "\t'p1' type_id=1\n"
 447                 "\t'p2' type_id=2",
 448                 "[16] VAR 'var1' type_id=1, linkage=global-alloc",
 449                 "[17] DATASEC 'datasec1' size=12 vlen=1\n"
 450                 "\ttype_id=1 offset=4 size=8",
 451                 "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
 452                 "[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
 453                 "[20] TYPE_TAG 'tag1' type_id=1",
 454                 "[21] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
 455                 "\t'v1' val=-1\n"
 456                 "\t'v2' val=4886718345",
 457                 "[22] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
 458                 "\t'v1' val=18446744073709551615",
 459
 460                 /* types appended from the second BTF */
 461                 "[23] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
 462                 "[24] PTR '(anon)' type_id=23",
 463                 "[25] CONST '(anon)' type_id=27",
 464                 "[26] VOLATILE '(anon)' type_id=25",
 465                 "[27] RESTRICT '(anon)' type_id=26",
 466                 "[28] ARRAY '(anon)' type_id=24 index_type_id=23 nr_elems=10",
 467                 "[29] STRUCT 's1' size=8 vlen=2\n"
 468                 "\t'f1' type_id=23 bits_offset=0\n"
 469                 "\t'f2' type_id=23 bits_offset=32 bitfield_size=16",
 470                 "[30] UNION 'u1' size=8 vlen=1\n"
 471                 "\t'f1' type_id=23 bits_offset=0 bitfield_size=16",
 472                 "[31] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
 473                 "\t'v1' val=1\n"
 474                 "\t'v2' val=2",
 475                 "[32] FWD 'struct_fwd' fwd_kind=struct",
 476                 "[33] FWD 'union_fwd' fwd_kind=union",
 477                 "[34] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0",
 478                 "[35] TYPEDEF 'typedef1' type_id=23",
 479                 "[36] FUNC 'func1' type_id=37 linkage=global",
 480                 "[37] FUNC_PROTO '(anon)' ret_type_id=23 vlen=2\n"
 481                 "\t'p1' type_id=23\n"
 482                 "\t'p2' type_id=24",
 483                 "[38] VAR 'var1' type_id=23, linkage=global-alloc",
 484                 "[39] DATASEC 'datasec1' size=12 vlen=1\n"
 485                 "\ttype_id=23 offset=4 size=8",
 486                 "[40] DECL_TAG 'tag1' type_id=38 component_idx=-1",
 487                 "[41] DECL_TAG 'tag2' type_id=36 component_idx=1",
 488                 "[42] TYPE_TAG 'tag1' type_id=23",
 489                 "[43] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
 490                 "\t'v1' val=-1\n"
 491                 "\t'v2' val=4886718345",
 492                 "[44] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
 493                 "\t'v1' val=18446744073709551615");
 494
 495 cleanup:
 496         btf__free(btf1);
 497         btf__free(btf2);
 498 }
 499
 500 void test_btf_write()
 501 {
 502         if (test__start_subtest("btf_add"))
 503                 test_btf_add();
 504         if (test__start_subtest("btf_add_btf"))
 505                 test_btf_add_btf();
 506 }