1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 /* Copyright (c) 2018 Facebook */ 3 /*! \file */ 4 5 #ifndef __LIBBPF_BTF_H 6 #define __LIBBPF_BTF_H 7 8 #include <stdarg.h> 9 #include <stdbool.h> 10 #include <linux/btf.h> 11 #include <linux/types.h> 12 13 #include "libbpf_common.h" 14 15 #ifdef __cplusplus 16 extern "C" { 17 #endif 18 19 #define BTF_ELF_SEC ".BTF" 20 #define BTF_EXT_ELF_SEC ".BTF.ext" 21 #define BTF_BASE_ELF_SEC ".BTF.base" 22 #define MAPS_ELF_SEC ".maps" 23 24 struct btf; 25 struct btf_ext; 26 struct btf_type; 27 28 struct bpf_object; 29 30 enum btf_endianness { 31 BTF_LITTLE_ENDIAN = 0, 32 BTF_BIG_ENDIAN = 1, 33 }; 34 35 /** 36 * @brief **btf__free()** frees all data of a BTF object 37 * @param btf BTF object to free 38 */ 39 LIBBPF_API void btf__free(struct btf *btf); 40 41 /** 42 * @brief **btf__new()** creates a new instance of a BTF object from the raw 43 * bytes of an ELF's BTF section 44 * @param data raw bytes 45 * @param size number of bytes passed in `data` 46 * @return new BTF object instance which has to be eventually freed with 47 * **btf__free()** 48 * 49 * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract 50 * error code from such a pointer `libbpf_get_error()` should be used. If 51 * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is 52 * returned on error instead. In both cases thread-local `errno` variable is 53 * always set to error code as well. 54 */ 55 LIBBPF_API struct btf *btf__new(const void *data, __u32 size); 56 57 /** 58 * @brief **btf__new_split()** create a new instance of a BTF object from the 59 * provided raw data bytes. It takes another BTF instance, **base_btf**, which 60 * serves as a base BTF, which is extended by types in a newly created BTF 61 * instance 62 * @param data raw bytes 63 * @param size length of raw bytes 64 * @param base_btf the base BTF object 65 * @return new BTF object instance which has to be eventually freed with 66 * **btf__free()** 67 * 68 * If *base_btf* is NULL, `btf__new_split()` is equivalent to `btf__new()` and 69 * creates non-split BTF. 70 * 71 * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract 72 * error code from such a pointer `libbpf_get_error()` should be used. If 73 * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is 74 * returned on error instead. In both cases thread-local `errno` variable is 75 * always set to error code as well. 76 */ 77 LIBBPF_API struct btf *btf__new_split(const void *data, __u32 size, struct btf *base_btf); 78 79 /** 80 * @brief **btf__new_empty()** creates an empty BTF object. Use 81 * `btf__add_*()` to populate such BTF object. 82 * @return new BTF object instance which has to be eventually freed with 83 * **btf__free()** 84 * 85 * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract 86 * error code from such a pointer `libbpf_get_error()` should be used. If 87 * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is 88 * returned on error instead. In both cases thread-local `errno` variable is 89 * always set to error code as well. 90 */ 91 LIBBPF_API struct btf *btf__new_empty(void); 92 93 /** 94 * @brief **btf__new_empty_split()** creates an unpopulated BTF object from an 95 * ELF BTF section except with a base BTF on top of which split BTF should be 96 * based 97 * @return new BTF object instance which has to be eventually freed with 98 * **btf__free()** 99 * 100 * If *base_btf* is NULL, `btf__new_empty_split()` is equivalent to 101 * `btf__new_empty()` and creates non-split BTF. 102 * 103 * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract 104 * error code from such a pointer `libbpf_get_error()` should be used. If 105 * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is 106 * returned on error instead. In both cases thread-local `errno` variable is 107 * always set to error code as well. 108 */ 109 LIBBPF_API struct btf *btf__new_empty_split(struct btf *base_btf); 110 111 /** 112 * @brief **btf__distill_base()** creates new versions of the split BTF 113 * *src_btf* and its base BTF. The new base BTF will only contain the types 114 * needed to improve robustness of the split BTF to small changes in base BTF. 115 * When that split BTF is loaded against a (possibly changed) base, this 116 * distilled base BTF will help update references to that (possibly changed) 117 * base BTF. 118 * 119 * Both the new split and its associated new base BTF must be freed by 120 * the caller. 121 * 122 * If successful, 0 is returned and **new_base_btf** and **new_split_btf** 123 * will point at new base/split BTF. Both the new split and its associated 124 * new base BTF must be freed by the caller. 125 * 126 * A negative value is returned on error and the thread-local `errno` variable 127 * is set to the error code as well. 128 */ 129 LIBBPF_API int btf__distill_base(const struct btf *src_btf, struct btf **new_base_btf, 130 struct btf **new_split_btf); 131 132 LIBBPF_API struct btf *btf__parse(const char *path, struct btf_ext **btf_ext); 133 LIBBPF_API struct btf *btf__parse_split(const char *path, struct btf *base_btf); 134 LIBBPF_API struct btf *btf__parse_elf(const char *path, struct btf_ext **btf_ext); 135 LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_btf); 136 LIBBPF_API struct btf *btf__parse_raw(const char *path); 137 LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf); 138 139 LIBBPF_API struct btf *btf__load_vmlinux_btf(void); 140 LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf); 141 142 LIBBPF_API struct btf *btf__load_from_kernel_by_id(__u32 id); 143 LIBBPF_API struct btf *btf__load_from_kernel_by_id_split(__u32 id, struct btf *base_btf); 144 145 LIBBPF_API int btf__load_into_kernel(struct btf *btf); 146 LIBBPF_API __s32 btf__find_by_name(const struct btf *btf, 147 const char *type_name); 148 LIBBPF_API __s32 btf__find_by_name_kind(const struct btf *btf, 149 const char *type_name, __u32 kind); 150 LIBBPF_API __u32 btf__type_cnt(const struct btf *btf); 151 LIBBPF_API const struct btf *btf__base_btf(const struct btf *btf); 152 LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf, 153 __u32 id); 154 LIBBPF_API size_t btf__pointer_size(const struct btf *btf); 155 LIBBPF_API int btf__set_pointer_size(struct btf *btf, size_t ptr_sz); 156 LIBBPF_API enum btf_endianness btf__endianness(const struct btf *btf); 157 LIBBPF_API int btf__set_endianness(struct btf *btf, enum btf_endianness endian); 158 LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id); 159 LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id); 160 LIBBPF_API int btf__align_of(const struct btf *btf, __u32 id); 161 LIBBPF_API int btf__fd(const struct btf *btf); 162 LIBBPF_API void btf__set_fd(struct btf *btf, int fd); 163 LIBBPF_API const void *btf__raw_data(const struct btf *btf, __u32 *size); 164 LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset); 165 LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset); 166 167 LIBBPF_API struct btf_ext *btf_ext__new(const __u8 *data, __u32 size); 168 LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext); 169 LIBBPF_API const void *btf_ext__raw_data(const struct btf_ext *btf_ext, __u32 *size); 170 171 LIBBPF_API int btf__find_str(struct btf *btf, const char *s); 172 LIBBPF_API int btf__add_str(struct btf *btf, const char *s); 173 LIBBPF_API int btf__add_type(struct btf *btf, const struct btf *src_btf, 174 const struct btf_type *src_type); 175 /** 176 * @brief **btf__add_btf()** appends all the BTF types from *src_btf* into *btf* 177 * @param btf BTF object which all the BTF types and strings are added to 178 * @param src_btf BTF object which all BTF types and referenced strings are copied from 179 * @return BTF type ID of the first appended BTF type, or negative error code 180 * 181 * **btf__add_btf()** can be used to simply and efficiently append the entire 182 * contents of one BTF object to another one. All the BTF type data is copied 183 * over, all referenced type IDs are adjusted by adding a necessary ID offset. 184 * Only strings referenced from BTF types are copied over and deduplicated, so 185 * if there were some unused strings in *src_btf*, those won't be copied over, 186 * which is consistent with the general string deduplication semantics of BTF 187 * writing APIs. 188 * 189 * If any error is encountered during this process, the contents of *btf* is 190 * left intact, which means that **btf__add_btf()** follows the transactional 191 * semantics and the operation as a whole is all-or-nothing. 192 * 193 * *src_btf* has to be non-split BTF, as of now copying types from split BTF 194 * is not supported and will result in -ENOTSUP error code returned. 195 */ 196 LIBBPF_API int btf__add_btf(struct btf *btf, const struct btf *src_btf); 197 198 LIBBPF_API int btf__add_int(struct btf *btf, const char *name, size_t byte_sz, int encoding); 199 LIBBPF_API int btf__add_float(struct btf *btf, const char *name, size_t byte_sz); 200 LIBBPF_API int btf__add_ptr(struct btf *btf, int ref_type_id); 201 LIBBPF_API int btf__add_array(struct btf *btf, 202 int index_type_id, int elem_type_id, __u32 nr_elems); 203 /* struct/union construction APIs */ 204 LIBBPF_API int btf__add_struct(struct btf *btf, const char *name, __u32 sz); 205 LIBBPF_API int btf__add_union(struct btf *btf, const char *name, __u32 sz); 206 LIBBPF_API int btf__add_field(struct btf *btf, const char *name, int field_type_id, 207 __u32 bit_offset, __u32 bit_size); 208 209 /* enum construction APIs */ 210 LIBBPF_API int btf__add_enum(struct btf *btf, const char *name, __u32 bytes_sz); 211 LIBBPF_API int btf__add_enum_value(struct btf *btf, const char *name, __s64 value); 212 LIBBPF_API int btf__add_enum64(struct btf *btf, const char *name, __u32 bytes_sz, bool is_signed); 213 LIBBPF_API int btf__add_enum64_value(struct btf *btf, const char *name, __u64 value); 214 215 enum btf_fwd_kind { 216 BTF_FWD_STRUCT = 0, 217 BTF_FWD_UNION = 1, 218 BTF_FWD_ENUM = 2, 219 }; 220 221 LIBBPF_API int btf__add_fwd(struct btf *btf, const char *name, enum btf_fwd_kind fwd_kind); 222 LIBBPF_API int btf__add_typedef(struct btf *btf, const char *name, int ref_type_id); 223 LIBBPF_API int btf__add_volatile(struct btf *btf, int ref_type_id); 224 LIBBPF_API int btf__add_const(struct btf *btf, int ref_type_id); 225 LIBBPF_API int btf__add_restrict(struct btf *btf, int ref_type_id); 226 LIBBPF_API int btf__add_type_tag(struct btf *btf, const char *value, int ref_type_id); 227 228 /* func and func_proto construction APIs */ 229 LIBBPF_API int btf__add_func(struct btf *btf, const char *name, 230 enum btf_func_linkage linkage, int proto_type_id); 231 LIBBPF_API int btf__add_func_proto(struct btf *btf, int ret_type_id); 232 LIBBPF_API int btf__add_func_param(struct btf *btf, const char *name, int type_id); 233 234 /* var & datasec construction APIs */ 235 LIBBPF_API int btf__add_var(struct btf *btf, const char *name, int linkage, int type_id); 236 LIBBPF_API int btf__add_datasec(struct btf *btf, const char *name, __u32 byte_sz); 237 LIBBPF_API int btf__add_datasec_var_info(struct btf *btf, int var_type_id, 238 __u32 offset, __u32 byte_sz); 239 240 /* tag construction API */ 241 LIBBPF_API int btf__add_decl_tag(struct btf *btf, const char *value, int ref_type_id, 242 int component_idx); 243 244 struct btf_dedup_opts { 245 size_t sz; 246 /* optional .BTF.ext info to dedup along the main BTF info */ 247 struct btf_ext *btf_ext; 248 /* force hash collisions (used for testing) */ 249 bool force_collisions; 250 size_t :0; 251 }; 252 #define btf_dedup_opts__last_field force_collisions 253 254 LIBBPF_API int btf__dedup(struct btf *btf, const struct btf_dedup_opts *opts); 255 256 /** 257 * @brief **btf__relocate()** will check the split BTF *btf* for references 258 * to base BTF kinds, and verify those references are compatible with 259 * *base_btf*; if they are, *btf* is adjusted such that is re-parented to 260 * *base_btf* and type ids and strings are adjusted to accommodate this. 261 * 262 * If successful, 0 is returned and **btf** now has **base_btf** as its 263 * base. 264 * 265 * A negative value is returned on error and the thread-local `errno` variable 266 * is set to the error code as well. 267 */ 268 LIBBPF_API int btf__relocate(struct btf *btf, const struct btf *base_btf); 269 270 struct btf_dump; 271 272 struct btf_dump_opts { 273 size_t sz; 274 }; 275 #define btf_dump_opts__last_field sz 276 277 typedef void (*btf_dump_printf_fn_t)(void *ctx, const char *fmt, va_list args); 278 279 LIBBPF_API struct btf_dump *btf_dump__new(const struct btf *btf, 280 btf_dump_printf_fn_t printf_fn, 281 void *ctx, 282 const struct btf_dump_opts *opts); 283 284 LIBBPF_API void btf_dump__free(struct btf_dump *d); 285 286 LIBBPF_API int btf_dump__dump_type(struct btf_dump *d, __u32 id); 287 288 struct btf_dump_emit_type_decl_opts { 289 /* size of this struct, for forward/backward compatiblity */ 290 size_t sz; 291 /* optional field name for type declaration, e.g.: 292 * - struct my_struct <FNAME> 293 * - void (*<FNAME>)(int) 294 * - char (*<FNAME>)[123] 295 */ 296 const char *field_name; 297 /* extra indentation level (in number of tabs) to emit for multi-line 298 * type declarations (e.g., anonymous struct); applies for lines 299 * starting from the second one (first line is assumed to have 300 * necessary indentation already 301 */ 302 int indent_level; 303 /* strip all the const/volatile/restrict mods */ 304 bool strip_mods; 305 size_t :0; 306 }; 307 #define btf_dump_emit_type_decl_opts__last_field strip_mods 308 309 LIBBPF_API int 310 btf_dump__emit_type_decl(struct btf_dump *d, __u32 id, 311 const struct btf_dump_emit_type_decl_opts *opts); 312 313 314 struct btf_dump_type_data_opts { 315 /* size of this struct, for forward/backward compatibility */ 316 size_t sz; 317 const char *indent_str; 318 int indent_level; 319 /* below match "show" flags for bpf_show_snprintf() */ 320 bool compact; /* no newlines/indentation */ 321 bool skip_names; /* skip member/type names */ 322 bool emit_zeroes; /* show 0-valued fields */ 323 size_t :0; 324 }; 325 #define btf_dump_type_data_opts__last_field emit_zeroes 326 327 LIBBPF_API int 328 btf_dump__dump_type_data(struct btf_dump *d, __u32 id, 329 const void *data, size_t data_sz, 330 const struct btf_dump_type_data_opts *opts); 331 332 /* 333 * A set of helpers for easier BTF types handling. 334 * 335 * The inline functions below rely on constants from the kernel headers which 336 * may not be available for applications including this header file. To avoid 337 * compilation errors, we define all the constants here that were added after 338 * the initial introduction of the BTF_KIND* constants. 339 */ 340 #ifndef BTF_KIND_FUNC 341 #define BTF_KIND_FUNC 12 /* Function */ 342 #define BTF_KIND_FUNC_PROTO 13 /* Function Proto */ 343 #endif 344 #ifndef BTF_KIND_VAR 345 #define BTF_KIND_VAR 14 /* Variable */ 346 #define BTF_KIND_DATASEC 15 /* Section */ 347 #endif 348 #ifndef BTF_KIND_FLOAT 349 #define BTF_KIND_FLOAT 16 /* Floating point */ 350 #endif 351 /* The kernel header switched to enums, so the following were never #defined */ 352 #define BTF_KIND_DECL_TAG 17 /* Decl Tag */ 353 #define BTF_KIND_TYPE_TAG 18 /* Type Tag */ 354 #define BTF_KIND_ENUM64 19 /* Enum for up-to 64bit values */ 355 356 static inline __u16 btf_kind(const struct btf_type *t) 357 { 358 return BTF_INFO_KIND(t->info); 359 } 360 361 static inline __u16 btf_vlen(const struct btf_type *t) 362 { 363 return BTF_INFO_VLEN(t->info); 364 } 365 366 static inline bool btf_kflag(const struct btf_type *t) 367 { 368 return BTF_INFO_KFLAG(t->info); 369 } 370 371 static inline bool btf_is_void(const struct btf_type *t) 372 { 373 return btf_kind(t) == BTF_KIND_UNKN; 374 } 375 376 static inline bool btf_is_int(const struct btf_type *t) 377 { 378 return btf_kind(t) == BTF_KIND_INT; 379 } 380 381 static inline bool btf_is_ptr(const struct btf_type *t) 382 { 383 return btf_kind(t) == BTF_KIND_PTR; 384 } 385 386 static inline bool btf_is_array(const struct btf_type *t) 387 { 388 return btf_kind(t) == BTF_KIND_ARRAY; 389 } 390 391 static inline bool btf_is_struct(const struct btf_type *t) 392 { 393 return btf_kind(t) == BTF_KIND_STRUCT; 394 } 395 396 static inline bool btf_is_union(const struct btf_type *t) 397 { 398 return btf_kind(t) == BTF_KIND_UNION; 399 } 400 401 static inline bool btf_is_composite(const struct btf_type *t) 402 { 403 __u16 kind = btf_kind(t); 404 405 return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION; 406 } 407 408 static inline bool btf_is_enum(const struct btf_type *t) 409 { 410 return btf_kind(t) == BTF_KIND_ENUM; 411 } 412 413 static inline bool btf_is_enum64(const struct btf_type *t) 414 { 415 return btf_kind(t) == BTF_KIND_ENUM64; 416 } 417 418 static inline bool btf_is_fwd(const struct btf_type *t) 419 { 420 return btf_kind(t) == BTF_KIND_FWD; 421 } 422 423 static inline bool btf_is_typedef(const struct btf_type *t) 424 { 425 return btf_kind(t) == BTF_KIND_TYPEDEF; 426 } 427 428 static inline bool btf_is_volatile(const struct btf_type *t) 429 { 430 return btf_kind(t) == BTF_KIND_VOLATILE; 431 } 432 433 static inline bool btf_is_const(const struct btf_type *t) 434 { 435 return btf_kind(t) == BTF_KIND_CONST; 436 } 437 438 static inline bool btf_is_restrict(const struct btf_type *t) 439 { 440 return btf_kind(t) == BTF_KIND_RESTRICT; 441 } 442 443 static inline bool btf_is_mod(const struct btf_type *t) 444 { 445 __u16 kind = btf_kind(t); 446 447 return kind == BTF_KIND_VOLATILE || 448 kind == BTF_KIND_CONST || 449 kind == BTF_KIND_RESTRICT || 450 kind == BTF_KIND_TYPE_TAG; 451 } 452 453 static inline bool btf_is_func(const struct btf_type *t) 454 { 455 return btf_kind(t) == BTF_KIND_FUNC; 456 } 457 458 static inline bool btf_is_func_proto(const struct btf_type *t) 459 { 460 return btf_kind(t) == BTF_KIND_FUNC_PROTO; 461 } 462 463 static inline bool btf_is_var(const struct btf_type *t) 464 { 465 return btf_kind(t) == BTF_KIND_VAR; 466 } 467 468 static inline bool btf_is_datasec(const struct btf_type *t) 469 { 470 return btf_kind(t) == BTF_KIND_DATASEC; 471 } 472 473 static inline bool btf_is_float(const struct btf_type *t) 474 { 475 return btf_kind(t) == BTF_KIND_FLOAT; 476 } 477 478 static inline bool btf_is_decl_tag(const struct btf_type *t) 479 { 480 return btf_kind(t) == BTF_KIND_DECL_TAG; 481 } 482 483 static inline bool btf_is_type_tag(const struct btf_type *t) 484 { 485 return btf_kind(t) == BTF_KIND_TYPE_TAG; 486 } 487 488 static inline bool btf_is_any_enum(const struct btf_type *t) 489 { 490 return btf_is_enum(t) || btf_is_enum64(t); 491 } 492 493 static inline bool btf_kind_core_compat(const struct btf_type *t1, 494 const struct btf_type *t2) 495 { 496 return btf_kind(t1) == btf_kind(t2) || 497 (btf_is_any_enum(t1) && btf_is_any_enum(t2)); 498 } 499 500 static inline __u8 btf_int_encoding(const struct btf_type *t) 501 { 502 return BTF_INT_ENCODING(*(__u32 *)(t + 1)); 503 } 504 505 static inline __u8 btf_int_offset(const struct btf_type *t) 506 { 507 return BTF_INT_OFFSET(*(__u32 *)(t + 1)); 508 } 509 510 static inline __u8 btf_int_bits(const struct btf_type *t) 511 { 512 return BTF_INT_BITS(*(__u32 *)(t + 1)); 513 } 514 515 static inline struct btf_array *btf_array(const struct btf_type *t) 516 { 517 return (struct btf_array *)(t + 1); 518 } 519 520 static inline struct btf_enum *btf_enum(const struct btf_type *t) 521 { 522 return (struct btf_enum *)(t + 1); 523 } 524 525 struct btf_enum64; 526 527 static inline struct btf_enum64 *btf_enum64(const struct btf_type *t) 528 { 529 return (struct btf_enum64 *)(t + 1); 530 } 531 532 static inline __u64 btf_enum64_value(const struct btf_enum64 *e) 533 { 534 /* struct btf_enum64 is introduced in Linux 6.0, which is very 535 * bleeding-edge. Here we are avoiding relying on struct btf_enum64 536 * definition coming from kernel UAPI headers to support wider range 537 * of system-wide kernel headers. 538 * 539 * Given this header can be also included from C++ applications, that 540 * further restricts C tricks we can use (like using compatible 541 * anonymous struct). So just treat struct btf_enum64 as 542 * a three-element array of u32 and access second (lo32) and third 543 * (hi32) elements directly. 544 * 545 * For reference, here is a struct btf_enum64 definition: 546 * 547 * const struct btf_enum64 { 548 * __u32 name_off; 549 * __u32 val_lo32; 550 * __u32 val_hi32; 551 * }; 552 */ 553 const __u32 *e64 = (const __u32 *)e; 554 555 return ((__u64)e64[2] << 32) | e64[1]; 556 } 557 558 static inline struct btf_member *btf_members(const struct btf_type *t) 559 { 560 return (struct btf_member *)(t + 1); 561 } 562 563 /* Get bit offset of a member with specified index. */ 564 static inline __u32 btf_member_bit_offset(const struct btf_type *t, 565 __u32 member_idx) 566 { 567 const struct btf_member *m = btf_members(t) + member_idx; 568 bool kflag = btf_kflag(t); 569 570 return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset; 571 } 572 /* 573 * Get bitfield size of a member, assuming t is BTF_KIND_STRUCT or 574 * BTF_KIND_UNION. If member is not a bitfield, zero is returned. 575 */ 576 static inline __u32 btf_member_bitfield_size(const struct btf_type *t, 577 __u32 member_idx) 578 { 579 const struct btf_member *m = btf_members(t) + member_idx; 580 bool kflag = btf_kflag(t); 581 582 return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0; 583 } 584 585 static inline struct btf_param *btf_params(const struct btf_type *t) 586 { 587 return (struct btf_param *)(t + 1); 588 } 589 590 static inline struct btf_var *btf_var(const struct btf_type *t) 591 { 592 return (struct btf_var *)(t + 1); 593 } 594 595 static inline struct btf_var_secinfo * 596 btf_var_secinfos(const struct btf_type *t) 597 { 598 return (struct btf_var_secinfo *)(t + 1); 599 } 600 601 struct btf_decl_tag; 602 static inline struct btf_decl_tag *btf_decl_tag(const struct btf_type *t) 603 { 604 return (struct btf_decl_tag *)(t + 1); 605 } 606 607 #ifdef __cplusplus 608 } /* extern "C" */ 609 #endif 610 611 #endif /* __LIBBPF_BTF_H */ 612