| 1 | #ifndef _BABELTRACE_TYPES_H |
| 2 | #define _BABELTRACE_TYPES_H |
| 3 | |
| 4 | /* |
| 5 | * BabelTrace |
| 6 | * |
| 7 | * Type Header |
| 8 | * |
| 9 | * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 10 | * |
| 11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 12 | * of this software and associated documentation files (the "Software"), to deal |
| 13 | * in the Software without restriction, including without limitation the rights |
| 14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 15 | * copies of the Software, and to permit persons to whom the Software is |
| 16 | * furnished to do so, subject to the following conditions: |
| 17 | * |
| 18 | * The above copyright notice and this permission notice shall be included in |
| 19 | * all copies or substantial portions of the Software. |
| 20 | */ |
| 21 | |
| 22 | #include <babeltrace/align.h> |
| 23 | #include <babeltrace/list.h> |
| 24 | #include <stdbool.h> |
| 25 | #include <stdint.h> |
| 26 | #include <limits.h> |
| 27 | #include <string.h> |
| 28 | #include <glib.h> |
| 29 | #include <assert.h> |
| 30 | |
| 31 | /* Preallocate this many fields for structures */ |
| 32 | #define DEFAULT_NR_STRUCT_FIELDS 8 |
| 33 | |
| 34 | /* |
| 35 | * Always update stream_pos with move_pos and init_pos. |
| 36 | */ |
| 37 | struct stream_pos { |
| 38 | char *base; /* Base address */ |
| 39 | size_t offset; /* Offset from base, in bits */ |
| 40 | int dummy; /* Dummy position, for length calculation */ |
| 41 | }; |
| 42 | |
| 43 | static inline |
| 44 | void init_pos(struct stream_pos *pos, char *base) |
| 45 | { |
| 46 | pos->base = base; /* initial base, page-aligned */ |
| 47 | pos->offset = 0; |
| 48 | pos->dummy = false; |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * move_pos - move position of a relative bit offset |
| 53 | * |
| 54 | * TODO: allow larger files by updating base too. |
| 55 | */ |
| 56 | static inline |
| 57 | void move_pos(struct stream_pos *pos, size_t offset) |
| 58 | { |
| 59 | pos->offset = pos->offset + offset; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * align_pos - align position on a bit offset (> 0) |
| 64 | * |
| 65 | * TODO: allow larger files by updating base too. |
| 66 | */ |
| 67 | static inline |
| 68 | void align_pos(struct stream_pos *pos, size_t offset) |
| 69 | { |
| 70 | pos->offset += offset_align(pos->offset, offset); |
| 71 | } |
| 72 | |
| 73 | static inline |
| 74 | void copy_pos(struct stream_pos *dest, struct stream_pos *src) |
| 75 | { |
| 76 | memcpy(dest, src, sizeof(struct stream_pos)); |
| 77 | } |
| 78 | |
| 79 | static inline |
| 80 | char *get_pos_addr(struct stream_pos *pos) |
| 81 | { |
| 82 | /* Only makes sense to get the address after aligning on CHAR_BIT */ |
| 83 | assert(!(pos->offset % CHAR_BIT)); |
| 84 | return pos->base + (pos->offset / CHAR_BIT); |
| 85 | } |
| 86 | |
| 87 | struct format; |
| 88 | struct declaration; |
| 89 | |
| 90 | /* Type declaration scope */ |
| 91 | struct declaration_scope { |
| 92 | /* Hash table mapping type name GQuark to struct type */ |
| 93 | GHashTable *types; |
| 94 | /* Hash table mapping field name GQuark to struct declaration */ |
| 95 | GHashTable *declarations; |
| 96 | struct declaration_scope *parent_scope; |
| 97 | }; |
| 98 | |
| 99 | struct type { |
| 100 | GQuark name; /* type name */ |
| 101 | size_t alignment; /* type alignment, in bits */ |
| 102 | int ref; /* number of references to the type */ |
| 103 | /* |
| 104 | * type_free called with type ref is decremented to 0. |
| 105 | */ |
| 106 | void (*type_free)(struct type *type); |
| 107 | struct declaration * |
| 108 | (*declaration_new)(struct type *type, |
| 109 | struct declaration_scope *parent_scope); |
| 110 | /* |
| 111 | * declaration_free called with declaration ref is decremented to 0. |
| 112 | */ |
| 113 | void (*declaration_free)(struct declaration *declaration); |
| 114 | /* |
| 115 | * Declaration copy function. Knows how to find the child declaration |
| 116 | * from the parent declaration. |
| 117 | */ |
| 118 | void (*copy)(struct stream_pos *dest, const struct format *fdest, |
| 119 | struct stream_pos *src, const struct format *fsrc, |
| 120 | struct declaration *declaration); |
| 121 | }; |
| 122 | |
| 123 | struct declaration { |
| 124 | struct type *type; |
| 125 | int ref; /* number of references to the declaration */ |
| 126 | }; |
| 127 | |
| 128 | /* |
| 129 | * Because we address in bits, bitfields end up being exactly the same as |
| 130 | * integers, except that their read/write functions must be able to deal with |
| 131 | * read/write non aligned on CHAR_BIT. |
| 132 | */ |
| 133 | struct type_integer { |
| 134 | struct type p; |
| 135 | size_t len; /* length, in bits. */ |
| 136 | int byte_order; /* byte order */ |
| 137 | int signedness; |
| 138 | }; |
| 139 | |
| 140 | struct declaration_integer { |
| 141 | struct declaration p; |
| 142 | struct type_integer *type; |
| 143 | /* Last values read */ |
| 144 | union { |
| 145 | uint64_t _unsigned; |
| 146 | int64_t _signed; |
| 147 | } value; |
| 148 | }; |
| 149 | |
| 150 | struct type_float { |
| 151 | struct type p; |
| 152 | struct type_integer *sign; |
| 153 | struct type_integer *mantissa; |
| 154 | struct type_integer *exp; |
| 155 | int byte_order; |
| 156 | /* TODO: we might want to express more info about NaN, +inf and -inf */ |
| 157 | }; |
| 158 | |
| 159 | struct declaration_float { |
| 160 | struct declaration p; |
| 161 | struct type_float *type; |
| 162 | /* Last values read */ |
| 163 | long double value; |
| 164 | }; |
| 165 | |
| 166 | /* |
| 167 | * enum_val_equal assumes that signed and unsigned memory layout overlap. |
| 168 | */ |
| 169 | struct enum_range { |
| 170 | union { |
| 171 | int64_t _signed; |
| 172 | uint64_t _unsigned; |
| 173 | } start; /* lowest range value */ |
| 174 | union { |
| 175 | int64_t _signed; |
| 176 | uint64_t _unsigned; |
| 177 | } end; /* highest range value */ |
| 178 | }; |
| 179 | |
| 180 | struct enum_range_to_quark { |
| 181 | struct cds_list_head node; |
| 182 | struct enum_range range; |
| 183 | GQuark quark; |
| 184 | }; |
| 185 | |
| 186 | /* |
| 187 | * We optimize the common case (range of size 1: single value) by creating a |
| 188 | * hash table mapping values to quark sets. We then lookup the ranges to |
| 189 | * complete the quark set. |
| 190 | * |
| 191 | * TODO: The proper structure to hold the range to quark set mapping would be an |
| 192 | * interval tree, with O(n) size, O(n*log(n)) build time and O(log(n)) query |
| 193 | * time. Using a simple O(n) list search for now for implementation speed and |
| 194 | * given that we can expect to have a _relatively_ small number of enumeration |
| 195 | * ranges. This might become untrue if we are fed with symbol tables often |
| 196 | * required to lookup function names from instruction pointer value. |
| 197 | */ |
| 198 | struct enum_table { |
| 199 | GHashTable *value_to_quark_set; /* (value, GQuark GArray) */ |
| 200 | struct cds_list_head range_to_quark; /* (range, GQuark) */ |
| 201 | GHashTable *quark_to_range_set; /* (GQuark, range GArray) */ |
| 202 | }; |
| 203 | |
| 204 | struct type_enum { |
| 205 | struct type p; |
| 206 | struct type_integer *integer_type; |
| 207 | struct enum_table table; |
| 208 | }; |
| 209 | |
| 210 | struct declaration_enum { |
| 211 | struct declaration p; |
| 212 | struct declaration_integer *integer; |
| 213 | struct type_enum *type; |
| 214 | /* Last GQuark values read. Keeping a reference on the GQuark array. */ |
| 215 | GArray *value; |
| 216 | }; |
| 217 | |
| 218 | struct type_string { |
| 219 | struct type p; |
| 220 | }; |
| 221 | |
| 222 | struct declaration_string { |
| 223 | struct declaration p; |
| 224 | struct type_string *type; |
| 225 | char *value; /* freed at declaration_string teardown */ |
| 226 | }; |
| 227 | |
| 228 | struct type_field { |
| 229 | GQuark name; |
| 230 | struct type *type; |
| 231 | }; |
| 232 | |
| 233 | struct field { |
| 234 | GQuark name; |
| 235 | struct declaration *declaration; |
| 236 | }; |
| 237 | |
| 238 | struct type_struct { |
| 239 | struct type p; |
| 240 | GHashTable *fields_by_name; /* Tuples (field name, field index) */ |
| 241 | GArray *fields; /* Array of type_field */ |
| 242 | }; |
| 243 | |
| 244 | struct declaration_struct { |
| 245 | struct declaration p; |
| 246 | struct type_struct *type; |
| 247 | struct declaration_scope *scope; |
| 248 | GArray *fields; /* Array of struct field */ |
| 249 | }; |
| 250 | |
| 251 | struct type_variant { |
| 252 | struct type p; |
| 253 | GHashTable *fields_by_tag; /* Tuples (field tag, field index) */ |
| 254 | GArray *fields; /* Array of type_field */ |
| 255 | }; |
| 256 | |
| 257 | struct declaration_variant { |
| 258 | struct declaration p; |
| 259 | struct type_variant *type; |
| 260 | struct declaration_scope *scope; |
| 261 | struct declaration *enum_tag; |
| 262 | GArray *fields; /* Array of struct field */ |
| 263 | struct field *current_field; /* Last field read */ |
| 264 | }; |
| 265 | |
| 266 | struct type_array { |
| 267 | struct type p; |
| 268 | size_t len; |
| 269 | struct type *elem; |
| 270 | }; |
| 271 | |
| 272 | struct declaration_array { |
| 273 | struct declaration p; |
| 274 | struct type_array *type; |
| 275 | struct declaration_scope *scope; |
| 276 | struct field current_element; /* struct field */ |
| 277 | }; |
| 278 | |
| 279 | struct type_sequence { |
| 280 | struct type p; |
| 281 | struct type_integer *len_type; |
| 282 | struct type *elem; |
| 283 | }; |
| 284 | |
| 285 | struct declaration_sequence { |
| 286 | struct declaration p; |
| 287 | struct type_sequence *type; |
| 288 | struct declaration_scope *scope; |
| 289 | struct declaration_integer *len; |
| 290 | struct field current_element; /* struct field */ |
| 291 | }; |
| 292 | |
| 293 | struct type *lookup_type(GQuark type_name, struct declaration_scope *scope); |
| 294 | int register_type(struct type *type, struct declaration_scope *scope); |
| 295 | |
| 296 | struct declaration * |
| 297 | lookup_declaration(GQuark field_name, struct declaration_scope *scope); |
| 298 | int register_declaration(GQuark field_name, struct declaration *declaration, |
| 299 | struct declaration_scope *scope); |
| 300 | |
| 301 | void type_ref(struct type *type); |
| 302 | void type_unref(struct type *type); |
| 303 | |
| 304 | struct declaration_scope * |
| 305 | new_declaration_scope(struct declaration_scope *parent_scope); |
| 306 | void free_declaration_scope(struct declaration_scope *scope); |
| 307 | |
| 308 | void declaration_ref(struct declaration *declaration); |
| 309 | void declaration_unref(struct declaration *declaration); |
| 310 | |
| 311 | /* Nameless types can be created by passing a NULL name */ |
| 312 | |
| 313 | struct type_integer *integer_type_new(const char *name, |
| 314 | size_t len, int byte_order, |
| 315 | int signedness, size_t alignment); |
| 316 | |
| 317 | /* |
| 318 | * mantissa_len is the length of the number of bytes represented by the mantissa |
| 319 | * (e.g. result of DBL_MANT_DIG). It includes the leading 1. |
| 320 | */ |
| 321 | struct type_float *float_type_new(const char *name, |
| 322 | size_t mantissa_len, |
| 323 | size_t exp_len, int byte_order, |
| 324 | size_t alignment); |
| 325 | |
| 326 | /* |
| 327 | * A GQuark can be translated to/from strings with g_quark_from_string() and |
| 328 | * g_quark_to_string(). |
| 329 | */ |
| 330 | |
| 331 | /* |
| 332 | * Returns a GArray of GQuark or NULL. |
| 333 | * Caller must release the GArray with g_array_unref(). |
| 334 | */ |
| 335 | GArray *enum_uint_to_quark_set(const struct type_enum *enum_type, uint64_t v); |
| 336 | |
| 337 | /* |
| 338 | * Returns a GArray of GQuark or NULL. |
| 339 | * Caller must release the GArray with g_array_unref(). |
| 340 | */ |
| 341 | GArray *enum_int_to_quark_set(const struct type_enum *enum_type, uint64_t v); |
| 342 | |
| 343 | /* |
| 344 | * Returns a GArray of struct enum_range or NULL. |
| 345 | * Callers do _not_ own the returned GArray (and therefore _don't_ need to |
| 346 | * release it). |
| 347 | */ |
| 348 | GArray *enum_quark_to_range_set(const struct type_enum *enum_type, GQuark q); |
| 349 | void enum_signed_insert(struct type_enum *enum_type, |
| 350 | int64_t start, int64_t end, GQuark q); |
| 351 | void enum_unsigned_insert(struct type_enum *enum_type, |
| 352 | uint64_t start, uint64_t end, GQuark q); |
| 353 | size_t enum_get_nr_enumerators(struct type_enum *enum_type); |
| 354 | |
| 355 | struct type_enum *enum_type_new(const char *name, |
| 356 | struct type_integer *integer_type); |
| 357 | |
| 358 | struct type_struct *struct_type_new(const char *name); |
| 359 | void struct_type_add_field(struct type_struct *struct_type, |
| 360 | const char *field_name, struct type *field_type); |
| 361 | /* |
| 362 | * Returns the index of a field within a structure. |
| 363 | */ |
| 364 | unsigned long struct_type_lookup_field_index(struct type_struct *struct_type, |
| 365 | GQuark field_name); |
| 366 | /* |
| 367 | * field returned only valid as long as the field structure is not appended to. |
| 368 | */ |
| 369 | struct type_field * |
| 370 | struct_type_get_field_from_index(struct type_struct *struct_type, |
| 371 | unsigned long index); |
| 372 | struct field * |
| 373 | struct_get_field_from_index(struct declaration_struct *struct_declaration, |
| 374 | unsigned long index); |
| 375 | |
| 376 | /* |
| 377 | * The tag enumeration is validated to ensure that it contains only mappings |
| 378 | * from numeric values to a single tag. Overlapping tag value ranges are |
| 379 | * therefore forbidden. |
| 380 | */ |
| 381 | struct type_variant *variant_type_new(const char *name); |
| 382 | void variant_type_add_field(struct type_variant *variant_type, |
| 383 | const char *tag_name, struct type *tag_type); |
| 384 | struct type_field * |
| 385 | variant_type_get_field_from_tag(struct type_variant *variant_type, GQuark tag); |
| 386 | /* |
| 387 | * Returns 0 on success, -EPERM on error. |
| 388 | */ |
| 389 | int variant_declaration_set_tag(struct declaration_variant *variant, |
| 390 | struct declaration *enum_tag); |
| 391 | /* |
| 392 | * Returns the field selected by the current tag value. |
| 393 | * field returned only valid as long as the variant structure is not appended |
| 394 | * to. |
| 395 | */ |
| 396 | struct field * |
| 397 | variant_get_current_field(struct declaration_variant *variant); |
| 398 | |
| 399 | /* |
| 400 | * elem_type passed as parameter now belongs to the array. No need to free it |
| 401 | * explicitly. "len" is the number of elements in the array. |
| 402 | */ |
| 403 | struct type_array *array_type_new(const char *name, |
| 404 | size_t len, struct type *elem_type); |
| 405 | |
| 406 | /* |
| 407 | * int_type and elem_type passed as parameter now belong to the sequence. No |
| 408 | * need to free them explicitly. |
| 409 | */ |
| 410 | struct type_sequence *sequence_type_new(const char *name, |
| 411 | struct type_integer *len_type, |
| 412 | struct type *elem_type); |
| 413 | |
| 414 | #endif /* _BABELTRACE_TYPES_H */ |