text: /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
  /* Copyright (c) 2018 Facebook */
  /*! \file */
  
  #ifndef __LIBBPF_BTF_H
  #define __LIBBPF_BTF_H
  
  #include <stdarg.h>
  #include <stdbool.h>
  #include <linux/btf.h>
  #include <linux/types.h>
  
  #include "libbpf_common.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #define BTF_ELF_SEC ".BTF"
  #define BTF_EXT_ELF_SEC ".BTF.ext"
  #define MAPS_ELF_SEC ".maps"
  
  struct btf;
  struct btf_ext;
  struct btf_type;
  
  struct bpf_object;
  
  enum btf_endianness {
  	BTF_LITTLE_ENDIAN = 0,
  	BTF_BIG_ENDIAN = 1,
  };
  
  /**
   * @brief **btf__free()** frees all data of a BTF object
   * @param btf BTF object to free
   */
  LIBBPF_API void btf__free(struct btf *btf);
  
  /**
   * @brief **btf__new()** creates a new instance of a BTF object from the raw
   * bytes of an ELF's BTF section
   * @param data raw bytes
   * @param size number of bytes passed in `data`
   * @return new BTF object instance which has to be eventually freed with
   * **btf__free()**
   *
   * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
   * error code from such a pointer `libbpf_get_error()` should be used. If
   * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
   * returned on error instead. In both cases thread-local `errno` variable is
   * always set to error code as well.
   */
  LIBBPF_API struct btf *btf__new(const void *data, __u32 size);
  
  /**
   * @brief **btf__new_split()** create a new instance of a BTF object from the
   * provided raw data bytes. It takes another BTF instance, **base_btf**, which
   * serves as a base BTF, which is extended by types in a newly created BTF
   * instance
   * @param data raw bytes
   * @param size length of raw bytes
   * @param base_btf the base BTF object
   * @return new BTF object instance which has to be eventually freed with
   * **btf__free()**
   *
   * If *base_btf* is NULL, `btf__new_split()` is equivalent to `btf__new()` and
   * creates non-split BTF.
   *
   * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
   * error code from such a pointer `libbpf_get_error()` should be used. If
   * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
   * returned on error instead. In both cases thread-local `errno` variable is
   * always set to error code as well.
   */
  LIBBPF_API struct btf *btf__new_split(const void *data, __u32 size, struct btf *base_btf);
  
  /**
   * @brief **btf__new_empty()** creates an empty BTF object.  Use
   * `btf__add_*()` to populate such BTF object.
   * @return new BTF object instance which has to be eventually freed with
   * **btf__free()**
   *
   * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
   * error code from such a pointer `libbpf_get_error()` should be used. If
   * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
   * returned on error instead. In both cases thread-local `errno` variable is
   * always set to error code as well.
   */
  LIBBPF_API struct btf *btf__new_empty(void);
  
  /**
   * @brief **btf__new_empty_split()** creates an unpopulated BTF object from an
   * ELF BTF section except with a base BTF on top of which split BTF should be
   * based
   * @return new BTF object instance which has to be eventually freed with
   * **btf__free()**
   *
   * If *base_btf* is NULL, `btf__new_empty_split()` is equivalent to
   * `btf__new_empty()` and creates non-split BTF.
   *
   * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
   * error code from such a pointer `libbpf_get_error()` should be used. If
   * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
   * returned on error instead. In both cases thread-local `errno` variable is
   * always set to error code as well.
   */
  LIBBPF_API struct btf *btf__new_empty_split(struct btf *base_btf);
  
  LIBBPF_API struct btf *btf__parse(const char *path, struct btf_ext **btf_ext);
  LIBBPF_API struct btf *btf__parse_split(const char *path, struct btf *base_btf);
  LIBBPF_API struct btf *btf__parse_elf(const char *path, struct btf_ext **btf_ext);
  LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_btf);
  LIBBPF_API struct btf *btf__parse_raw(const char *path);
  LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf);
  
  LIBBPF_API struct btf *btf__load_vmlinux_btf(void);
  LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf);
  LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
  
  LIBBPF_API struct btf *btf__load_from_kernel_by_id(__u32 id);
  LIBBPF_API struct btf *btf__load_from_kernel_by_id_split(__u32 id, struct btf *base_btf);
  LIBBPF_DEPRECATED_SINCE(0, 6, "use btf__load_from_kernel_by_id instead")
  LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
  
  LIBBPF_DEPRECATED_SINCE(0, 6, "intended for internal libbpf use only")
  LIBBPF_API int btf__finalize_data(struct bpf_object *obj, struct btf *btf);
  LIBBPF_DEPRECATED_SINCE(0, 6, "use btf__load_into_kernel instead")
  LIBBPF_API int btf__load(struct btf *btf);
  LIBBPF_API int btf__load_into_kernel(struct btf *btf);
  LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
  				   const char *type_name);
  LIBBPF_API __s32 btf__find_by_name_kind(const struct btf *btf,
  					const char *type_name, __u32 kind);
  LIBBPF_DEPRECATED_SINCE(0, 7, "use btf__type_cnt() instead; note that btf__get_nr_types() == btf__type_cnt() - 1")
  LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf);
  LIBBPF_API __u32 btf__type_cnt(const struct btf *btf);
  LIBBPF_API const struct btf *btf__base_btf(const struct btf *btf);
  LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
  						  __u32 id);
  LIBBPF_API size_t btf__pointer_size(const struct btf *btf);
  LIBBPF_API int btf__set_pointer_size(struct btf *btf, size_t ptr_sz);
  LIBBPF_API enum btf_endianness btf__endianness(const struct btf *btf);
  LIBBPF_API int btf__set_endianness(struct btf *btf, enum btf_endianness endian);
  LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
  LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
  LIBBPF_API int btf__align_of(const struct btf *btf, __u32 id);
  LIBBPF_API int btf__fd(const struct btf *btf);
  LIBBPF_API void btf__set_fd(struct btf *btf, int fd);
  LIBBPF_DEPRECATED_SINCE(0, 7, "use btf__raw_data() instead")
  LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
  LIBBPF_API const void *btf__raw_data(const struct btf *btf, __u32 *size);
  LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
  LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset);
  LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
  				    __u32 expected_key_size,
  				    __u32 expected_value_size,
  				    __u32 *key_type_id, __u32 *value_type_id);
  
  LIBBPF_API struct btf_ext *btf_ext__new(const __u8 *data, __u32 size);
  LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext);
  LIBBPF_API const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext,
  					     __u32 *size);
  LIBBPF_API LIBBPF_DEPRECATED("btf_ext__reloc_func_info was never meant as a public API and has wrong assumptions embedded in it; it will be removed in the future libbpf versions")
  int btf_ext__reloc_func_info(const struct btf *btf,
  			     const struct btf_ext *btf_ext,
  			     const char *sec_name, __u32 insns_cnt,
  			     void **func_info, __u32 *cnt);
  LIBBPF_API LIBBPF_DEPRECATED("btf_ext__reloc_line_info was never meant as a public API and has wrong assumptions embedded in it; it will be removed in the future libbpf versions")
  int btf_ext__reloc_line_info(const struct btf *btf,
  			     const struct btf_ext *btf_ext,
  			     const char *sec_name, __u32 insns_cnt,
  			     void **line_info, __u32 *cnt);
  LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext);
  LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext);
  
  LIBBPF_API int btf__find_str(struct btf *btf, const char *s);
  LIBBPF_API int btf__add_str(struct btf *btf, const char *s);
  LIBBPF_API int btf__add_type(struct btf *btf, const struct btf *src_btf,
  			     const struct btf_type *src_type);
  /**
   * @brief **btf__add_btf()** appends all the BTF types from *src_btf* into *btf*
   * @param btf BTF object which all the BTF types and strings are added to
   * @param src_btf BTF object which all BTF types and referenced strings are copied from
   * @return BTF type ID of the first appended BTF type, or negative error code
   *
   * **btf__add_btf()** can be used to simply and efficiently append the entire
   * contents of one BTF object to another one. All the BTF type data is copied
   * over, all referenced type IDs are adjusted by adding a necessary ID offset.
   * Only strings referenced from BTF types are copied over and deduplicated, so
   * if there were some unused strings in *src_btf*, those won't be copied over,
   * which is consistent with the general string deduplication semantics of BTF
   * writing APIs.
   *
   * If any error is encountered during this process, the contents of *btf* is
   * left intact, which means that **btf__add_btf()** follows the transactional
   * semantics and the operation as a whole is all-or-nothing.
   *
   * *src_btf* has to be non-split BTF, as of now copying types from split BTF
   * is not supported and will result in -ENOTSUP error code returned.
   */
  LIBBPF_API int btf__add_btf(struct btf *btf, const struct btf *src_btf);
  
  LIBBPF_API int btf__add_int(struct btf *btf, const char *name, size_t byte_sz, int encoding);
  LIBBPF_API int btf__add_float(struct btf *btf, const char *name, size_t byte_sz);
  LIBBPF_API int btf__add_ptr(struct btf *btf, int ref_type_id);
  LIBBPF_API int btf__add_array(struct btf *btf,
  			      int index_type_id, int elem_type_id, __u32 nr_elems);
  /* struct/union construction APIs */
  LIBBPF_API int btf__add_struct(struct btf *btf, const char *name, __u32 sz);
  LIBBPF_API int btf__add_union(struct btf *btf, const char *name, __u32 sz);
  LIBBPF_API int btf__add_field(struct btf *btf, const char *name, int field_type_id,
  			      __u32 bit_offset, __u32 bit_size);
  
  /* enum construction APIs */
  LIBBPF_API int btf__add_enum(struct btf *btf, const char *name, __u32 bytes_sz);
  LIBBPF_API int btf__add_enum_value(struct btf *btf, const char *name, __s64 value);
  
  enum btf_fwd_kind {
  	BTF_FWD_STRUCT = 0,
  	BTF_FWD_UNION = 1,
  	BTF_FWD_ENUM = 2,
  };
  
  LIBBPF_API int btf__add_fwd(struct btf *btf, const char *name, enum btf_fwd_kind fwd_kind);
  LIBBPF_API int btf__add_typedef(struct btf *btf, const char *name, int ref_type_id);
  LIBBPF_API int btf__add_volatile(struct btf *btf, int ref_type_id);
  LIBBPF_API int btf__add_const(struct btf *btf, int ref_type_id);
  LIBBPF_API int btf__add_restrict(struct btf *btf, int ref_type_id);
  LIBBPF_API int btf__add_type_tag(struct btf *btf, const char *value, int ref_type_id);
  
  /* func and func_proto construction APIs */
  LIBBPF_API int btf__add_func(struct btf *btf, const char *name,
  			     enum btf_func_linkage linkage, int proto_type_id);
  LIBBPF_API int btf__add_func_proto(struct btf *btf, int ret_type_id);
  LIBBPF_API int btf__add_func_param(struct btf *btf, const char *name, int type_id);
  
  /* var & datasec construction APIs */
  LIBBPF_API int btf__add_var(struct btf *btf, const char *name, int linkage, int type_id);
  LIBBPF_API int btf__add_datasec(struct btf *btf, const char *name, __u32 byte_sz);
  LIBBPF_API int btf__add_datasec_var_info(struct btf *btf, int var_type_id,
  					 __u32 offset, __u32 byte_sz);
  
  /* tag construction API */
  LIBBPF_API int btf__add_decl_tag(struct btf *btf, const char *value, int ref_type_id,
  			    int component_idx);
  
  struct btf_dedup_opts {
  	size_t sz;
  	/* optional .BTF.ext info to dedup along the main BTF info */
  	struct btf_ext *btf_ext;
  	/* force hash collisions (used for testing) */
  	bool force_collisions;
  	size_t :0;
  };
  #define btf_dedup_opts__last_field force_collisions
  
  LIBBPF_API int btf__dedup(struct btf *btf, const struct btf_dedup_opts *opts);
  
  LIBBPF_API int btf__dedup_v0_6_0(struct btf *btf, const struct btf_dedup_opts *opts);
  
  LIBBPF_DEPRECATED_SINCE(0, 7, "use btf__dedup() instead")
  LIBBPF_API int btf__dedup_deprecated(struct btf *btf, struct btf_ext *btf_ext, const void *opts);
  #define btf__dedup(...) ___libbpf_overload(___btf_dedup, __VA_ARGS__)
  #define ___btf_dedup3(btf, btf_ext, opts) btf__dedup_deprecated(btf, btf_ext, opts)
  #define ___btf_dedup2(btf, opts) btf__dedup(btf, opts)
  
  struct btf_dump;
  
  struct btf_dump_opts {
  	union {
  		size_t sz;
  		void *ctx; /* DEPRECATED: will be gone in v1.0 */
  	};
  };
  
  typedef void (*btf_dump_printf_fn_t)(void *ctx, const char *fmt, va_list args);
  
  LIBBPF_API struct btf_dump *btf_dump__new(const struct btf *btf,
  					  btf_dump_printf_fn_t printf_fn,
  					  void *ctx,
  					  const struct btf_dump_opts *opts);
  
  LIBBPF_API struct btf_dump *btf_dump__new_v0_6_0(const struct btf *btf,
  						 btf_dump_printf_fn_t printf_fn,
  						 void *ctx,
  						 const struct btf_dump_opts *opts);
  
  LIBBPF_API struct btf_dump *btf_dump__new_deprecated(const struct btf *btf,
  						     const struct btf_ext *btf_ext,
  						     const struct btf_dump_opts *opts,
  						     btf_dump_printf_fn_t printf_fn);
  
  /* Choose either btf_dump__new() or btf_dump__new_deprecated() based on the
   * type of 4th argument. If it's btf_dump's print callback, use deprecated
   * API; otherwise, choose the new btf_dump__new(). ___libbpf_override()
   * doesn't work here because both variants have 4 input arguments.
   *
   * (void *) casts are necessary to avoid compilation warnings about type
   * mismatches, because even though __builtin_choose_expr() only ever evaluates
   * one side the other side still has to satisfy type constraints (this is
   * compiler implementation limitation which might be lifted eventually,
   * according to the documentation). So passing struct btf_ext in place of
   * btf_dump_printf_fn_t would be generating compilation warning.  Casting to
   * void * avoids this issue.
   *
   * Also, two type compatibility checks for a function and function pointer are
   * required because passing function reference into btf_dump__new() as
   * btf_dump__new(..., my_callback, ...) and as btf_dump__new(...,
   * &my_callback, ...) (not explicit ampersand in the latter case) actually
   * differs as far as __builtin_types_compatible_p() is concerned. Thus two
   * checks are combined to detect callback argument.
   *
   * The rest works just like in case of ___libbpf_override() usage with symbol
   * versioning.
   *
   * C++ compilers don't support __builtin_types_compatible_p(), so at least
   * don't screw up compilation for them and let C++ users pick btf_dump__new
   * vs btf_dump__new_deprecated explicitly.
   */
  #ifndef __cplusplus
  #define btf_dump__new(a1, a2, a3, a4) __builtin_choose_expr(				\
  	__builtin_types_compatible_p(typeof(a4), btf_dump_printf_fn_t) ||		\
  	__builtin_types_compatible_p(typeof(a4), void(void *, const char *, va_list)),	\
  	btf_dump__new_deprecated((void *)a1, (void *)a2, (void *)a3, (void *)a4),	\
  	btf_dump__new((void *)a1, (void *)a2, (void *)a3, (void *)a4))
  #endif
  
  LIBBPF_API void btf_dump__free(struct btf_dump *d);
  
  LIBBPF_API int btf_dump__dump_type(struct btf_dump *d, __u32 id);
  
  struct btf_dump_emit_type_decl_opts {
  	/* size of this struct, for forward/backward compatiblity */
  	size_t sz;
  	/* optional field name for type declaration, e.g.:
  	 * - struct my_struct <FNAME>
  	 * - void (*<FNAME>)(int)
  	 * - char (*<FNAME>)[123]
  	 */
  	const char *field_name;
  	/* extra indentation level (in number of tabs) to emit for multi-line
  	 * type declarations (e.g., anonymous struct); applies for lines
  	 * starting from the second one (first line is assumed to have
  	 * necessary indentation already
  	 */
  	int indent_level;
  	/* strip all the const/volatile/restrict mods */
  	bool strip_mods;
  	size_t :0;
  };
  #define btf_dump_emit_type_decl_opts__last_field strip_mods
  
  LIBBPF_API int
  btf_dump__emit_type_decl(struct btf_dump *d, __u32 id,
  			 const struct btf_dump_emit_type_decl_opts *opts);
  
  
  struct btf_dump_type_data_opts {
  	/* size of this struct, for forward/backward compatibility */
  	size_t sz;
  	const char *indent_str;
  	int indent_level;
  	/* below match "show" flags for bpf_show_snprintf() */
  	bool compact;		/* no newlines/indentation */
  	bool skip_names;	/* skip member/type names */
  	bool emit_zeroes;	/* show 0-valued fields */
  	size_t :0;
  };
  #define btf_dump_type_data_opts__last_field emit_zeroes
  
  LIBBPF_API int
  btf_dump__dump_type_data(struct btf_dump *d, __u32 id,
  			 const void *data, size_t data_sz,
  			 const struct btf_dump_type_data_opts *opts);
  
  /*
   * A set of helpers for easier BTF types handling
   */
  static inline __u16 btf_kind(const struct btf_type *t)
  {
  	return BTF_INFO_KIND(t->info);
  }
  
  static inline __u16 btf_vlen(const struct btf_type *t)
  {
  	return BTF_INFO_VLEN(t->info);
  }
  
  static inline bool btf_kflag(const struct btf_type *t)
  {
  	return BTF_INFO_KFLAG(t->info);
  }
  
  static inline bool btf_is_void(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_UNKN;
  }
  
  static inline bool btf_is_int(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_INT;
  }
  
  static inline bool btf_is_ptr(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_PTR;
  }
  
  static inline bool btf_is_array(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_ARRAY;
  }
  
  static inline bool btf_is_struct(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_STRUCT;
  }
  
  static inline bool btf_is_union(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_UNION;
  }
  
  static inline bool btf_is_composite(const struct btf_type *t)
  {
  	__u16 kind = btf_kind(t);
  
  	return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
  }
  
  static inline bool btf_is_enum(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_ENUM;
  }
  
  static inline bool btf_is_fwd(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_FWD;
  }
  
  static inline bool btf_is_typedef(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_TYPEDEF;
  }
  
  static inline bool btf_is_volatile(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_VOLATILE;
  }
  
  static inline bool btf_is_const(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_CONST;
  }
  
  static inline bool btf_is_restrict(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_RESTRICT;
  }
  
  static inline bool btf_is_mod(const struct btf_type *t)
  {
  	__u16 kind = btf_kind(t);
  
  	return kind == BTF_KIND_VOLATILE ||
  	       kind == BTF_KIND_CONST ||
  	       kind == BTF_KIND_RESTRICT ||
  	       kind == BTF_KIND_TYPE_TAG;
  }
  
  static inline bool btf_is_func(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_FUNC;
  }
  
  static inline bool btf_is_func_proto(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_FUNC_PROTO;
  }
  
  static inline bool btf_is_var(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_VAR;
  }
  
  static inline bool btf_is_datasec(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_DATASEC;
  }
  
  static inline bool btf_is_float(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_FLOAT;
  }
  
  static inline bool btf_is_decl_tag(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_DECL_TAG;
  }
  
  static inline bool btf_is_type_tag(const struct btf_type *t)
  {
  	return btf_kind(t) == BTF_KIND_TYPE_TAG;
  }
  
  static inline __u8 btf_int_encoding(const struct btf_type *t)
  {
  	return BTF_INT_ENCODING(*(__u32 *)(t + 1));
  }
  
  static inline __u8 btf_int_offset(const struct btf_type *t)
  {
  	return BTF_INT_OFFSET(*(__u32 *)(t + 1));
  }
  
  static inline __u8 btf_int_bits(const struct btf_type *t)
  {
  	return BTF_INT_BITS(*(__u32 *)(t + 1));
  }
  
  static inline struct btf_array *btf_array(const struct btf_type *t)
  {
  	return (struct btf_array *)(t + 1);
  }
  
  static inline struct btf_enum *btf_enum(const struct btf_type *t)
  {
  	return (struct btf_enum *)(t + 1);
  }
  
  static inline struct btf_member *btf_members(const struct btf_type *t)
  {
  	return (struct btf_member *)(t + 1);
  }
  
  /* Get bit offset of a member with specified index. */
  static inline __u32 btf_member_bit_offset(const struct btf_type *t,
  					  __u32 member_idx)
  {
  	const struct btf_member *m = btf_members(t) + member_idx;
  	bool kflag = btf_kflag(t);
  
  	return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset;
  }
  /*
   * Get bitfield size of a member, assuming t is BTF_KIND_STRUCT or
   * BTF_KIND_UNION. If member is not a bitfield, zero is returned.
   */
  static inline __u32 btf_member_bitfield_size(const struct btf_type *t,
  					     __u32 member_idx)
  {
  	const struct btf_member *m = btf_members(t) + member_idx;
  	bool kflag = btf_kflag(t);
  
  	return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0;
  }
  
  static inline struct btf_param *btf_params(const struct btf_type *t)
  {
  	return (struct btf_param *)(t + 1);
  }
  
  static inline struct btf_var *btf_var(const struct btf_type *t)
  {
  	return (struct btf_var *)(t + 1);
  }
  
  static inline struct btf_var_secinfo *
  btf_var_secinfos(const struct btf_type *t)
  {
  	return (struct btf_var_secinfo *)(t + 1);
  }
  
  struct btf_decl_tag;
  static inline struct btf_decl_tag *btf_decl_tag(const struct btf_type *t)
  {
  	return (struct btf_decl_tag *)(t + 1);
  }
  
  #ifdef __cplusplus
  } /* extern "C" */
  #endif
  
  #endif /* __LIBBPF_BTF_H */
  