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2e33ac5a PP |
1 | #ifndef BABELTRACE_CTF_IR_FIELDS_H |
2 | #define BABELTRACE_CTF_IR_FIELDS_H | |
adc315b8 JG |
3 | |
4 | /* | |
2e33ac5a | 5 | * Babeltrace - CTF IR: Event Fields |
adc315b8 | 6 | * |
de9dd397 | 7 | * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
adc315b8 JG |
8 | * |
9 | * Author: Jérémie Galarneau <jeremie.galarneau@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 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
27 | * SOFTWARE. | |
28 | * | |
29 | * The Common Trace Format (CTF) Specification is available at | |
30 | * http://www.efficios.com/ctf | |
31 | */ | |
32 | ||
33 | #include <stdint.h> | |
cd95e351 | 34 | #include <stddef.h> |
544d0515 | 35 | #include <babeltrace/ctf-ir/field-types.h> |
adc315b8 JG |
36 | |
37 | #ifdef __cplusplus | |
38 | extern "C" { | |
39 | #endif | |
40 | ||
91f379cb PP |
41 | /** |
42 | @defgroup ctfirfields CTF IR fields | |
43 | @ingroup ctfir | |
44 | @brief CTF IR fields. | |
45 | ||
46 | @code | |
47 | #include <babeltrace/ctf-ir/fields.h> | |
48 | @endcode | |
49 | ||
50 | A CTF IR <strong><em>field</em></strong> is an object which holds a | |
51 | concrete value, and which is described by a @ft. | |
52 | ||
53 | In the CTF IR hierarchy, you can set the root fields of two objects: | |
54 | ||
55 | - \ref ctfirpacket | |
56 | - Trace packet header field: bt_ctf_packet_set_header(). | |
57 | - Stream packet context field: bt_ctf_packet_set_context(). | |
58 | - \ref ctfirevent | |
59 | - Stream event header field: bt_ctf_event_set_header(). | |
60 | - Stream event context field: bt_ctf_event_set_stream_event_context(). | |
61 | - Event context field: bt_ctf_event_set_event_context(). | |
62 | - Event payload field: bt_ctf_event_set_payload_field(). | |
63 | ||
64 | There are two categories of fields: | |
65 | ||
66 | - <strong>Basic fields</strong>: | |
67 | - @intfield: contains an integral value. | |
68 | - @floatfield: contains a floating point number value. | |
69 | - @enumfield: contains an integer field which contains an integral | |
70 | value. | |
71 | - @stringfield: contains a string value. | |
72 | - <strong>Compound fields</strong>: | |
73 | - @structfield: contains an ordered list of named fields | |
74 | (possibly with different @fts). | |
75 | - @arrayfield: contains an ordered list of fields which share | |
76 | the same field type. | |
77 | - @seqfield: contains an ordered list of fields which share | |
78 | the same field type. | |
79 | - @varfield: contains a single, current field. | |
80 | ||
81 | You can create a field object from a @ft object with | |
82 | bt_ctf_field_create(). The enumeration and compound fields create their | |
83 | contained fields with the following getters if such fields do not exist | |
84 | yet: | |
85 | ||
86 | - bt_ctf_field_enumeration_get_container() | |
87 | - bt_ctf_field_structure_get_field() | |
88 | - bt_ctf_field_array_get_field() | |
89 | - bt_ctf_field_sequence_get_field() | |
90 | - bt_ctf_field_variant_get_field() | |
91 | ||
7fcd5734 JD |
92 | If you already have a field object, you can also assign it to a specific |
93 | name within a @structfield with bt_ctf_field_structure_set_field(). | |
94 | ||
91f379cb PP |
95 | You can get a reference to the @ft which was used to create a field with |
96 | bt_ctf_field_get_type(). You can get the | |
1487a16a | 97 | \link #bt_ctf_field_type_id type ID\endlink of this field type directly with |
91f379cb PP |
98 | bt_ctf_field_get_type_id(). |
99 | ||
100 | You can get a deep copy of a field with bt_ctf_field_copy(). The field | |
101 | copy, and its contained field copies if it's the case, have the same | |
102 | field type as the originals. | |
103 | ||
104 | As with any Babeltrace object, CTF IR field objects have | |
105 | <a href="https://en.wikipedia.org/wiki/Reference_counting">reference | |
106 | counts</a>. See \ref refs to learn more about the reference counting | |
107 | management of Babeltrace objects. | |
108 | ||
109 | The functions which freeze CTF IR \link ctfirpacket packet\endlink and | |
110 | \link ctfirevent event\endlink objects also freeze their root field | |
111 | objects. You cannot modify a frozen field object: it is considered | |
112 | immutable, except for \link refs reference counting\endlink. | |
113 | ||
114 | @sa ctfirfieldtypes | |
115 | ||
116 | @file | |
117 | @brief CTF IR fields type and functions. | |
118 | @sa ctfirfields | |
119 | ||
120 | @addtogroup ctfirfields | |
121 | @{ | |
122 | */ | |
123 | ||
124 | /** | |
125 | @struct bt_ctf_field | |
126 | @brief A CTF IR field. | |
127 | @sa ctfirfields | |
128 | */ | |
129 | struct bt_ctf_field; | |
adc315b8 JG |
130 | struct bt_ctf_event_class; |
131 | struct bt_ctf_event; | |
adc315b8 | 132 | struct bt_ctf_field_type; |
e0f15669 | 133 | struct bt_ctf_field_type_enumeration_mapping_iterator; |
adc315b8 | 134 | |
91f379cb PP |
135 | /** |
136 | @name Creation and parent field type access functions | |
137 | @{ | |
138 | */ | |
139 | ||
140 | /** | |
141 | @brief Creates an uninitialized @field described by the @ft | |
142 | \p field_type. | |
143 | ||
144 | On success, \p field_type becomes the parent of the created field | |
145 | object. | |
146 | ||
147 | On success, this function creates an \em uninitialized field: it has | |
148 | no value. You need to set the value of the created field with one of the | |
149 | its specific setters. | |
150 | ||
151 | @param[in] field_type Field type which describes the field to create. | |
152 | @returns Created field object, or \c NULL on error. | |
153 | ||
154 | @prenotnull{field_type} | |
155 | @postsuccessrefcountret1 | |
156 | @postsuccessfrozen{field_type} | |
157 | */ | |
adc315b8 | 158 | extern struct bt_ctf_field *bt_ctf_field_create( |
91f379cb | 159 | struct bt_ctf_field_type *field_type); |
adc315b8 | 160 | |
91f379cb PP |
161 | /** |
162 | @brief Returns the parent @ft of the @field \p field. | |
adc315b8 | 163 | |
91f379cb PP |
164 | This function returns a reference to the field type which was used to |
165 | create the field object in the first place with bt_ctf_field_create(). | |
cd95e351 | 166 | |
91f379cb PP |
167 | @param[in] field Field of which to get the parent field type. |
168 | @returns Parent field type of \p event, | |
169 | or \c NULL on error. | |
adc315b8 | 170 | |
91f379cb PP |
171 | @prenotnull{field} |
172 | @postrefcountsame{field} | |
173 | @postsuccessrefcountretinc | |
174 | */ | |
175 | extern struct bt_ctf_field_type *bt_ctf_field_get_type( | |
176 | struct bt_ctf_field *field); | |
cd95e351 | 177 | |
91f379cb | 178 | /** @} */ |
adc315b8 | 179 | |
91f379cb PP |
180 | /** |
181 | @name Type information | |
182 | @{ | |
183 | */ | |
adc315b8 | 184 | |
91f379cb PP |
185 | /** |
186 | @brief Returns the type ID of the @ft of the @field \p field. | |
adc315b8 | 187 | |
91f379cb PP |
188 | @param[in] field Field of which to get the type ID of its |
189 | parent field type.. | |
190 | @returns Type ID of the parent field type of \p field, | |
1487a16a | 191 | or #BT_CTF_FIELD_TYPE_ID_UNKNOWN on error. |
3f4a108d | 192 | |
91f379cb PP |
193 | @prenotnull{field} |
194 | @postrefcountsame{field} | |
f78d67fb | 195 | |
1487a16a | 196 | @sa #bt_ctf_field_type_id: CTF IR field type ID. |
91f379cb PP |
197 | @sa bt_ctf_field_is_integer(): Returns whether or not a given field is a |
198 | @intfield. | |
199 | @sa bt_ctf_field_is_floating_point(): Returns whether or not a given | |
200 | field is a @floatfield. | |
201 | @sa bt_ctf_field_is_enumeration(): Returns whether or not a given field | |
202 | is a @enumfield. | |
203 | @sa bt_ctf_field_is_string(): Returns whether or not a given field is a | |
204 | @stringfield. | |
205 | @sa bt_ctf_field_is_structure(): Returns whether or not a given field is | |
206 | a @structfield. | |
207 | @sa bt_ctf_field_is_array(): Returns whether or not a given field is a | |
208 | @arrayfield. | |
209 | @sa bt_ctf_field_is_sequence(): Returns whether or not a given field is | |
210 | a @seqfield. | |
211 | @sa bt_ctf_field_is_variant(): Returns whether or not a given field is a | |
212 | @varfield. | |
213 | */ | |
1487a16a | 214 | extern enum bt_ctf_field_type_id bt_ctf_field_get_type_id(struct bt_ctf_field *field); |
adc315b8 | 215 | |
96e8f959 MD |
216 | /* |
217 | * bt_ctf_field_signed_integer_get_value: get a signed integer field's value | |
218 | * | |
219 | * Get a signed integer field's value. | |
220 | * | |
221 | * @param integer Signed integer field instance. | |
222 | * @param value Pointer to a signed integer where the value will be stored. | |
223 | * | |
224 | * Returns 0 on success, a negative value on error. | |
225 | */ | |
226 | extern int bt_ctf_field_signed_integer_get_value(struct bt_ctf_field *integer, | |
227 | int64_t *value); | |
228 | ||
91f379cb PP |
229 | /** |
230 | @brief Returns whether or not the @field \p field is a @intfield. | |
cd95e351 | 231 | |
91f379cb PP |
232 | @param[in] field Field to check (can be \c NULL). |
233 | @returns 1 if \p field is an integer field, or 0 | |
234 | otherwise (including if \p field is | |
235 | \c NULL). | |
cd95e351 | 236 | |
91f379cb PP |
237 | @prenotnull{field} |
238 | @postrefcountsame{field} | |
adc315b8 | 239 | |
91f379cb PP |
240 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given |
241 | field's type. | |
242 | */ | |
243 | extern int bt_ctf_field_is_integer(struct bt_ctf_field *field); | |
cd95e351 | 244 | |
91f379cb PP |
245 | /** |
246 | @brief Returns whether or not the @field \p field is a @floatfield. | |
adc315b8 | 247 | |
91f379cb PP |
248 | @param[in] field Field to check (can be \c NULL). |
249 | @returns 1 if \p field is a floating point number field, | |
250 | or 0 otherwise (including if \p field is | |
251 | \c NULL). | |
252 | ||
253 | @prenotnull{field} | |
254 | @postrefcountsame{field} | |
255 | ||
256 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
257 | field's type. | |
258 | */ | |
259 | extern int bt_ctf_field_is_floating_point(struct bt_ctf_field *field); | |
260 | ||
261 | /** | |
262 | @brief Returns whether or not the @field \p field is a @enumfield. | |
263 | ||
264 | @param[in] field Field to check (can be \c NULL). | |
265 | @returns 1 if \p field is an enumeration field, or 0 | |
266 | otherwise (including if \p field is | |
267 | \c NULL). | |
268 | ||
269 | @prenotnull{field} | |
270 | @postrefcountsame{field} | |
271 | ||
272 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
273 | field's type. | |
274 | */ | |
275 | extern int bt_ctf_field_is_enumeration(struct bt_ctf_field *field); | |
276 | ||
277 | /** | |
278 | @brief Returns whether or not the @field \p field is a @stringfield. | |
279 | ||
280 | @param[in] field Field to check (can be \c NULL). | |
281 | @returns 1 if \p field is a string field, or 0 | |
282 | otherwise (including if \p field is | |
283 | \c NULL). | |
284 | ||
285 | @prenotnull{field} | |
286 | @postrefcountsame{field} | |
287 | ||
288 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
289 | field's type. | |
290 | */ | |
291 | extern int bt_ctf_field_is_string(struct bt_ctf_field *field); | |
292 | ||
293 | /** | |
294 | @brief Returns whether or not the @field \p field is a @structfield. | |
295 | ||
296 | @param[in] field Field to check (can be \c NULL). | |
297 | @returns 1 if \p field is a structure field, or 0 | |
298 | otherwise (including if \p field is | |
299 | \c NULL). | |
300 | ||
301 | @prenotnull{field} | |
302 | @postrefcountsame{field} | |
303 | ||
304 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
305 | field's type. | |
306 | */ | |
307 | extern int bt_ctf_field_is_structure(struct bt_ctf_field *field); | |
308 | ||
309 | /** | |
310 | @brief Returns whether or not the @field \p field is a @arrayfield. | |
311 | ||
312 | @param[in] field Field to check (can be \c NULL). | |
313 | @returns 1 if \p field is an array field, or 0 | |
314 | otherwise (including if \p field is | |
315 | \c NULL). | |
316 | ||
317 | @prenotnull{field} | |
318 | @postrefcountsame{field} | |
319 | ||
320 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
321 | field's type. | |
322 | */ | |
323 | extern int bt_ctf_field_is_array(struct bt_ctf_field *field); | |
324 | ||
325 | /** | |
326 | @brief Returns whether or not the @field \p field is a @seqfield. | |
327 | ||
328 | @param[in] field Field to check (can be \c NULL). | |
329 | @returns 1 if \p field is a sequence field, or 0 | |
330 | otherwise (including if \p field is | |
331 | \c NULL). | |
332 | ||
333 | @prenotnull{field} | |
334 | @postrefcountsame{field} | |
335 | ||
336 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
337 | field's type. | |
338 | */ | |
339 | extern int bt_ctf_field_is_sequence(struct bt_ctf_field *field); | |
340 | ||
341 | /** | |
342 | @brief Returns whether or not the @field \p field is a @varfield. | |
343 | ||
344 | @param[in] field Field to check (can be \c NULL). | |
345 | @returns 1 if \p field is a variant field, or 0 | |
346 | otherwise (including if \p field is | |
347 | \c NULL). | |
348 | ||
349 | @prenotnull{field} | |
350 | @postrefcountsame{field} | |
351 | ||
352 | @sa bt_ctf_field_get_type_id(): Returns the type ID of a given | |
353 | field's type. | |
354 | */ | |
355 | extern int bt_ctf_field_is_variant(struct bt_ctf_field *field); | |
356 | ||
357 | /** @} */ | |
358 | ||
359 | /** | |
360 | @name Misc. functions | |
361 | @{ | |
362 | */ | |
363 | ||
364 | /** | |
365 | @brief Creates a \em deep copy of the @field \p field. | |
366 | ||
367 | You can copy a frozen field: the resulting copy is <em>not frozen</em>. | |
368 | ||
369 | @param[in] field Field to copy. | |
370 | @returns Deep copy of \p field on success, | |
371 | or \c NULL on error. | |
372 | ||
373 | @prenotnull{field} | |
374 | @postrefcountsame{field} | |
375 | @postsuccessrefcountret1 | |
376 | @post <strong>On success</strong>, the returned field is not frozen. | |
377 | */ | |
378 | extern struct bt_ctf_field *bt_ctf_field_copy(struct bt_ctf_field *field); | |
379 | ||
380 | /** @} */ | |
381 | ||
382 | /** @} */ | |
383 | ||
384 | /** | |
385 | @defgroup ctfirintfield CTF IR integer field | |
386 | @ingroup ctfirfields | |
387 | @brief CTF IR integer field. | |
388 | ||
389 | @code | |
390 | #include <babeltrace/ctf-ir/fields.h> | |
391 | @endcode | |
392 | ||
393 | A CTF IR <strong><em>integer field</em></strong> is a @field which | |
394 | holds a signed or unsigned integral value, and which is described by | |
395 | a @intft. | |
396 | ||
397 | An integer field object is considered \em unsigned if | |
398 | bt_ctf_field_type_integer_get_signed() on its parent field type returns | |
399 | 0. Otherwise it is considered \em signed. You \em must use | |
400 | bt_ctf_field_unsigned_integer_get_value() and | |
401 | bt_ctf_field_unsigned_integer_set_value() with an unsigned integer | |
402 | field, and bt_ctf_field_signed_integer_get_value() and | |
403 | bt_ctf_field_signed_integer_set_value() with a signed integer field. | |
404 | ||
405 | After you create an integer field with bt_ctf_field_create(), you | |
406 | \em must set an integral value with | |
407 | bt_ctf_field_unsigned_integer_set_value() or | |
408 | bt_ctf_field_signed_integer_set_value() before you can get the | |
409 | field's value with bt_ctf_field_unsigned_integer_get_value() or | |
410 | bt_ctf_field_signed_integer_get_value(). | |
411 | ||
412 | @sa ctfirintfieldtype | |
413 | @sa ctfirfields | |
414 | ||
415 | @addtogroup ctfirintfield | |
416 | @{ | |
417 | */ | |
418 | ||
419 | /** | |
420 | @brief Returns the signed integral value of the @intfield | |
421 | \p integer_field. | |
422 | ||
423 | @param[in] integer_field Integer field of which to get the | |
424 | signed integral value. | |
425 | @param[out] value Returned signed integral value of | |
426 | \p integer_field. | |
427 | @returns 0 on success, or a negative value on | |
428 | error, including if \p integer_field | |
429 | has no integral value yet. | |
430 | ||
431 | @prenotnull{integer_field} | |
432 | @prenotnull{value} | |
433 | @preisintfield{integer_field} | |
434 | @pre bt_ctf_field_type_integer_get_signed() returns 1 for the parent | |
435 | @ft of \p integer_field. | |
436 | @pre \p integer_field contains a signed integral value previously | |
437 | set with bt_ctf_field_signed_integer_set_value(). | |
438 | @postrefcountsame{integer_field} | |
439 | ||
440 | @sa bt_ctf_field_signed_integer_set_value(): Sets the signed integral | |
441 | value of a given integer field. | |
442 | */ | |
443 | extern int bt_ctf_field_signed_integer_get_value( | |
444 | struct bt_ctf_field *integer_field, int64_t *value); | |
445 | ||
446 | /** | |
447 | @brief Sets the signed integral value of the @intfield | |
448 | \p integer_field to \p value. | |
449 | ||
450 | @param[in] integer_field Integer field of which to set | |
451 | the signed integral value. | |
452 | @param[in] value New signed integral value of | |
453 | \p integer_field. | |
454 | @returns 0 on success, or a negative value on error. | |
455 | ||
456 | @prenotnull{integer_field} | |
457 | @preisintfield{integer_field} | |
458 | @prehot{integer_field} | |
459 | @pre bt_ctf_field_type_integer_get_signed() returns 1 for the parent | |
460 | @ft of \p integer_field. | |
461 | @postrefcountsame{integer_field} | |
462 | ||
463 | @sa bt_ctf_field_signed_integer_get_value(): Returns the signed integral | |
464 | value of a given integer field. | |
465 | */ | |
466 | extern int bt_ctf_field_signed_integer_set_value( | |
467 | struct bt_ctf_field *integer_field, int64_t value); | |
468 | ||
469 | /** | |
470 | @brief Returns the unsigned integral value of the @intfield | |
471 | \p integer_field. | |
472 | ||
473 | @param[in] integer_field Integer field of which to get the | |
474 | unsigned integral value. | |
475 | @param[out] value Returned unsigned integral value of | |
476 | \p integer_field. | |
477 | @returns 0 on success, or a negative value on | |
478 | error, including if \p integer_field | |
479 | has no integral value yet. | |
480 | ||
481 | @prenotnull{integer_field} | |
482 | @prenotnull{value} | |
483 | @preisintfield{integer_field} | |
484 | @pre bt_ctf_field_type_integer_get_signed() returns 0 for the parent | |
485 | @ft of \p integer_field. | |
486 | @pre \p integer_field contains an unsigned integral value previously | |
487 | set with bt_ctf_field_unsigned_integer_set_value(). | |
488 | @postrefcountsame{integer_field} | |
489 | ||
490 | @sa bt_ctf_field_unsigned_integer_set_value(): Sets the unsigned | |
491 | integral value of a given integer field. | |
492 | */ | |
493 | extern int bt_ctf_field_unsigned_integer_get_value( | |
494 | struct bt_ctf_field *integer_field, uint64_t *value); | |
495 | ||
496 | /** | |
497 | @brief Sets the unsigned integral value of the @intfield | |
498 | \p integer_field to \p value. | |
499 | ||
500 | @param[in] integer_field Integer field of which to set | |
501 | the unsigned integral value. | |
502 | @param[in] value New unsigned integral value of | |
503 | \p integer_field. | |
504 | @returns 0 on success, or a negative value on error. | |
505 | ||
506 | @prenotnull{integer_field} | |
507 | @preisintfield{integer_field} | |
508 | @prehot{integer_field} | |
509 | @pre bt_ctf_field_type_integer_get_signed() returns 0 for the parent | |
510 | @ft of \p integer_field. | |
511 | @postrefcountsame{integer_field} | |
512 | ||
513 | @sa bt_ctf_field_unsigned_integer_get_value(): Returns the unsigned | |
514 | integral value of a given integer field. | |
515 | */ | |
516 | extern int bt_ctf_field_unsigned_integer_set_value( | |
517 | struct bt_ctf_field *integer_field, uint64_t value); | |
518 | ||
519 | /** @} */ | |
520 | ||
521 | /** | |
522 | @defgroup ctfirfloatfield CTF IR floating point number field | |
523 | @ingroup ctfirfields | |
524 | @brief CTF IR floating point number field. | |
525 | ||
526 | @code | |
527 | #include <babeltrace/ctf-ir/fields.h> | |
528 | @endcode | |
529 | ||
530 | A CTF IR <strong><em>floating point number field</em></strong> is a | |
531 | @field which holds a floating point number value, and which is | |
532 | described by a @floatft. | |
533 | ||
534 | After you create a floating point number field with bt_ctf_field_create(), you | |
535 | \em must set a floating point number value with | |
536 | bt_ctf_field_floating_point_set_value() before you can get the | |
537 | field's value with bt_ctf_field_floating_point_get_value(). | |
538 | ||
539 | @sa ctfirfloatfieldtype | |
540 | @sa ctfirfields | |
541 | ||
542 | @addtogroup ctfirfloatfield | |
543 | @{ | |
544 | */ | |
545 | ||
546 | /** | |
547 | @brief Returns the floating point number value of the @floatfield | |
548 | \p float_field. | |
549 | ||
550 | @param[in] float_field Floating point number field of which to get the | |
551 | floating point number value. | |
552 | @param[out] value Returned floating point number value of | |
553 | \p float_field. | |
554 | @returns 0 on success, or a negative value on error, | |
555 | including if \p float_field has no floating | |
556 | point number value yet. | |
557 | ||
558 | @prenotnull{float_field} | |
559 | @prenotnull{value} | |
560 | @preisfloatfield{float_field} | |
561 | @pre \p float_field contains a floating point number value previously | |
562 | set with bt_ctf_field_floating_point_set_value(). | |
563 | @postrefcountsame{float_field} | |
564 | ||
565 | @sa bt_ctf_field_floating_point_set_value(): Sets the floating point | |
566 | number value of a given floating point number field. | |
567 | */ | |
cd95e351 | 568 | extern int bt_ctf_field_floating_point_get_value( |
91f379cb | 569 | struct bt_ctf_field *float_field, double *value); |
cd95e351 | 570 | |
91f379cb PP |
571 | /** |
572 | @brief Sets the floating point number value of the @floatfield | |
573 | \p float_field to \p value. | |
574 | ||
575 | @param[in] float_field Floating point number field of which to set | |
576 | the floating point number value. | |
577 | @param[in] value New floating point number value of | |
578 | \p float_field. | |
579 | @returns 0 on success, or a negative value on error. | |
580 | ||
581 | @prenotnull{float_field} | |
582 | @preisfloatfield{float_field} | |
583 | @prehot{float_field} | |
584 | @postrefcountsame{float_field} | |
585 | ||
586 | @sa bt_ctf_field_floating_point_get_value(): Returns the floating point | |
587 | number value of a given floating point number field. | |
588 | */ | |
adc315b8 | 589 | extern int bt_ctf_field_floating_point_set_value( |
91f379cb | 590 | struct bt_ctf_field *float_field, |
adc315b8 JG |
591 | double value); |
592 | ||
91f379cb PP |
593 | /** @} */ |
594 | ||
595 | /** | |
596 | @defgroup ctfirenumfield CTF IR enumeration field | |
597 | @ingroup ctfirfields | |
598 | @brief CTF IR enumeration field. | |
599 | ||
600 | @code | |
601 | #include <babeltrace/ctf-ir/fields.h> | |
602 | @endcode | |
603 | ||
604 | A CTF IR <strong><em>enumeration field</em></strong> is a @field which | |
605 | holds a @intfield, and which is described by a @enumft. | |
606 | ||
607 | To set the current integral value of an enumeration field, you need to | |
608 | get its wrapped @intfield with bt_ctf_field_enumeration_get_container(), | |
609 | and then set the integral value with either | |
610 | bt_ctf_field_signed_integer_set_value() or | |
611 | bt_ctf_field_unsigned_integer_set_value(). | |
612 | ||
613 | Once you set the integral value of an enumeration field by following the | |
5c3f3b7e PP |
614 | previous paragraph, you can get the mappings containing this value in |
615 | their range with bt_ctf_field_enumeration_get_mappings(). This function | |
616 | returns a @enumftiter. | |
91f379cb PP |
617 | |
618 | @sa ctfirenumfieldtype | |
619 | @sa ctfirfields | |
620 | ||
621 | @addtogroup ctfirenumfield | |
622 | @{ | |
623 | */ | |
624 | ||
625 | /** | |
626 | @brief Returns the @intfield, potentially creating it, wrapped by the | |
627 | @enumfield \p enum_field. | |
628 | ||
629 | This function creates the @intfield to return if it does not currently | |
630 | exist. | |
631 | ||
632 | @param[in] enum_field Enumeration field of which to get the wrapped | |
633 | integer field. | |
634 | @returns Integer field wrapped by \p enum_field, or | |
635 | \c NULL on error. | |
636 | ||
637 | @prenotnull{enum_field} | |
638 | @preisenumfield{enum_field} | |
639 | @postrefcountsame{enum_field} | |
640 | @postsuccessrefcountretinc | |
641 | */ | |
642 | extern struct bt_ctf_field *bt_ctf_field_enumeration_get_container( | |
643 | struct bt_ctf_field *enum_field); | |
644 | ||
645 | /** | |
5c3f3b7e PP |
646 | @brief Returns a @enumftiter on all the mappings of the field type of |
647 | \p enum_field which contain the current integral value of the | |
648 | @enumfield \p enum_field in their range. | |
649 | ||
650 | This function is the equivalent of using | |
651 | bt_ctf_field_type_enumeration_find_mappings_by_unsigned_value() or | |
652 | bt_ctf_field_type_enumeration_find_mappings_by_signed_value() with the | |
653 | current integral value of \p enum_field. | |
654 | ||
655 | @param[in] enum_field Enumeration field of which to get the mappings | |
656 | containing the current integral value of \p | |
657 | enum_field in their range. | |
658 | @returns @enumftiter on the set of mappings of the field | |
659 | type of \p enum_field which contain the current | |
660 | integral value of \p enum_field in their range, | |
661 | or \c NULL if no mappings were found or on | |
662 | error. | |
91f379cb PP |
663 | |
664 | @prenotnull{enum_field} | |
665 | @preisenumfield{enum_field} | |
666 | @pre The wrapped integer field of \p enum_field contains an integral | |
667 | value. | |
668 | @postrefcountsame{enum_field} | |
8dc7eb94 | 669 | @postsuccessrefcountret1 |
5c3f3b7e PP |
670 | @post <strong>On success</strong>, the returned @enumftiter can iterate |
671 | on at least one mapping. | |
91f379cb | 672 | */ |
e0f15669 JG |
673 | extern struct bt_ctf_field_type_enumeration_mapping_iterator * |
674 | bt_ctf_field_enumeration_get_mappings(struct bt_ctf_field *enum_field); | |
91f379cb PP |
675 | |
676 | /** @} */ | |
677 | ||
678 | /** | |
679 | @defgroup ctfirstringfield CTF IR string field | |
680 | @ingroup ctfirfields | |
681 | @brief CTF IR string field. | |
682 | ||
683 | @code | |
684 | #include <babeltrace/ctf-ir/fields.h> | |
685 | @endcode | |
686 | ||
687 | A CTF IR <strong><em>string field</em></strong> is a @field which holds | |
688 | a string value, and which is described by a @stringft. | |
689 | ||
690 | Use bt_ctf_field_string_set_value() to set the current string value | |
691 | of a string field object. You can also use bt_ctf_field_string_append() | |
692 | and bt_ctf_field_string_append_len() to append a string to the current | |
693 | value of a string field. | |
694 | ||
695 | After you create a string field with bt_ctf_field_create(), you | |
696 | \em must set a string value with | |
697 | bt_ctf_field_string_set_value(), bt_ctf_field_string_append(), or | |
698 | bt_ctf_field_string_append_len() before you can get the | |
699 | field's value with bt_ctf_field_string_get_value(). | |
700 | ||
701 | @sa ctfirstringfieldtype | |
702 | @sa ctfirfields | |
703 | ||
704 | @addtogroup ctfirstringfield | |
705 | @{ | |
706 | */ | |
707 | ||
708 | /** | |
709 | @brief Returns the string value of the @stringfield \p string_field. | |
710 | ||
711 | On success, \p string_field remains the sole owner of the returned | |
712 | value. | |
713 | ||
714 | @param[in] string_field String field field of which to get the | |
715 | string value. | |
716 | @returns String value, or \c NULL on error. | |
717 | ||
718 | @prenotnull{string_field} | |
719 | @prenotnull{value} | |
720 | @preisstringfield{string_field} | |
721 | @pre \p string_field contains a string value previously | |
722 | set with bt_ctf_field_string_set_value(), | |
723 | bt_ctf_field_string_append(), or | |
724 | bt_ctf_field_string_append_len(). | |
725 | @postrefcountsame{string_field} | |
726 | ||
727 | @sa bt_ctf_field_string_set_value(): Sets the string value of a given | |
728 | string field. | |
729 | */ | |
cd95e351 JG |
730 | extern const char *bt_ctf_field_string_get_value( |
731 | struct bt_ctf_field *string_field); | |
732 | ||
91f379cb PP |
733 | /** |
734 | @brief Sets the string value of the @stringfield \p string_field to | |
735 | \p value. | |
736 | ||
737 | @param[in] string_field String field of which to set | |
738 | the string value. | |
739 | @param[in] value New string value of \p string_field (copied | |
740 | on success). | |
741 | @returns 0 on success, or a negative value on error. | |
742 | ||
743 | @prenotnull{string_field} | |
744 | @prenotnull{value} | |
745 | @preisstringfield{string_field} | |
746 | @prehot{string_field} | |
747 | @postrefcountsame{string_field} | |
748 | ||
749 | @sa bt_ctf_field_string_get_value(): Returns the string value of a | |
750 | given string field. | |
751 | */ | |
cd95e351 | 752 | extern int bt_ctf_field_string_set_value(struct bt_ctf_field *string_field, |
adc315b8 JG |
753 | const char *value); |
754 | ||
91f379cb PP |
755 | /** |
756 | @brief Appends the string \p value to the current string value of | |
757 | the @stringfield \p string_field. | |
758 | ||
759 | This function is the equivalent of: | |
760 | ||
761 | @code | |
762 | bt_ctf_field_string_append_len(string_field, value, strlen(value)); | |
763 | @endcode | |
764 | ||
765 | @param[in] string_field String field of which to append \p value to | |
766 | its current value. | |
767 | @param[in] value String to append to the current string value | |
768 | of \p string_field (copied on success). | |
769 | @returns 0 on success, or a negative value on error. | |
770 | ||
771 | @prenotnull{string_field} | |
772 | @prenotnull{value} | |
773 | @preisstringfield{string_field} | |
774 | @prehot{string_field} | |
775 | @postrefcountsame{string_field} | |
776 | ||
777 | @sa bt_ctf_field_string_set_value(): Sets the string value of a given | |
778 | string field. | |
779 | */ | |
c6f9c5a3 PP |
780 | extern int bt_ctf_field_string_append(struct bt_ctf_field *string_field, |
781 | const char *value); | |
782 | ||
91f379cb PP |
783 | /** |
784 | @brief Appends the first \p length characters of \p value to the | |
785 | current string value of the @stringfield \p string_field. | |
786 | ||
787 | If \p string_field has no current string value, this function first | |
788 | sets an empty string as the string value of \p string_field and then | |
789 | appends the first \p length characters of \p value. | |
790 | ||
791 | @param[in] string_field String field of which to append the first | |
792 | \p length characters of \p value to | |
793 | its current value. | |
794 | @param[in] value String containing the characters to append to | |
795 | the current string value of \p string_field | |
796 | (copied on success). | |
797 | @param[in] length Number of characters of \p value to append to | |
798 | the current string value of \p string_field. | |
799 | @returns 0 on success, or a negative value on error. | |
800 | ||
801 | @prenotnull{string_field} | |
802 | @prenotnull{value} | |
803 | @preisstringfield{string_field} | |
804 | @prehot{string_field} | |
805 | @postrefcountsame{string_field} | |
806 | ||
807 | @sa bt_ctf_field_string_set_value(): Sets the string value of a given | |
808 | string field. | |
809 | */ | |
f98c6554 PP |
810 | extern int bt_ctf_field_string_append_len( |
811 | struct bt_ctf_field *string_field, const char *value, | |
812 | unsigned int length); | |
813 | ||
91f379cb | 814 | /** @} */ |
cd95e351 | 815 | |
91f379cb PP |
816 | /** |
817 | @defgroup ctfirstructfield CTF IR structure field | |
818 | @ingroup ctfirfields | |
819 | @brief CTF IR structure field. | |
4ebcc695 | 820 | |
91f379cb PP |
821 | @code |
822 | #include <babeltrace/ctf-ir/fields.h> | |
823 | @endcode | |
8f3553be | 824 | |
91f379cb PP |
825 | A CTF IR <strong><em>structure field</em></strong> is a @field which |
826 | contains an ordered list of zero or more named @fields which can be | |
827 | different @fts, and which is described by a @structft. | |
8f3553be | 828 | |
91f379cb PP |
829 | To set the value of a specific field of a structure field, you need to |
830 | first get the field with bt_ctf_field_structure_get_field() or | |
7fcd5734 JD |
831 | bt_ctf_field_structure_get_field_by_index(). If you already have a |
832 | field object, you can assign it to a specific name within a structure | |
833 | field with bt_ctf_field_structure_set_field(). | |
8f3553be | 834 | |
91f379cb PP |
835 | @sa ctfirstructfieldtype |
836 | @sa ctfirfields | |
8f3553be | 837 | |
91f379cb PP |
838 | @addtogroup ctfirstructfield |
839 | @{ | |
840 | */ | |
8f3553be | 841 | |
91f379cb PP |
842 | /** |
843 | @brief Returns the @field named \p name, potentially creating it, | |
844 | in the @structfield \p struct_field. | |
8f3553be | 845 | |
91f379cb PP |
846 | This function creates the @field to return if it does not currently |
847 | exist. | |
8f3553be | 848 | |
91f379cb PP |
849 | @param[in] struct_field Structure field of which to get the field |
850 | named \p name. | |
851 | @param[in] name Name of the field to get from \p struct_field. | |
852 | @returns Field named \p name in \p struct_field, or | |
853 | \c NULL on error. | |
8f3553be | 854 | |
91f379cb PP |
855 | @prenotnull{struct_field} |
856 | @prenotnull{name} | |
857 | @preisstructfield{struct_field} | |
858 | @postrefcountsame{struct_field} | |
859 | @postsuccessrefcountretinc | |
860 | ||
861 | @sa bt_ctf_field_structure_get_field_by_index(): Returns the field of a | |
862 | given structure field by index. | |
7fcd5734 JD |
863 | @sa bt_ctf_field_structure_set_field(): Sets the field of a given |
864 | structure field. | |
91f379cb | 865 | */ |
9ac68eb1 | 866 | extern struct bt_ctf_field *bt_ctf_field_structure_get_field_by_name( |
91f379cb PP |
867 | struct bt_ctf_field *struct_field, const char *name); |
868 | ||
9ac68eb1 PP |
869 | /* Pre-2.0 CTF writer compatibility */ |
870 | #define bt_ctf_field_structure_get_field bt_ctf_field_structure_get_field_by_name | |
871 | ||
91f379cb PP |
872 | /** |
873 | @brief Returns the @field at index \p index in the @structfield | |
874 | \p struct_field. | |
875 | ||
876 | @param[in] struct_field Structure field of which to get the field | |
877 | at index \p index. | |
878 | @param[in] index Index of the field to get in \p struct_field. | |
879 | @returns Field at index \p index in \p struct_field, or | |
880 | \c NULL on error. | |
881 | ||
882 | @prenotnull{struct_field} | |
883 | @preisstructfield{struct_field} | |
884 | @pre \p index is lesser than the number of fields contained in the | |
885 | parent field type of \p struct_field (see | |
886 | bt_ctf_field_type_structure_get_field_count()). | |
887 | @postrefcountsame{struct_field} | |
888 | @postsuccessrefcountretinc | |
889 | ||
890 | @sa bt_ctf_field_structure_get_field(): Returns the field of a | |
891 | given structure field by name. | |
7fcd5734 JD |
892 | @sa bt_ctf_field_structure_set_field(): Sets the field of a given |
893 | structure field. | |
91f379cb PP |
894 | */ |
895 | extern struct bt_ctf_field *bt_ctf_field_structure_get_field_by_index( | |
9ac68eb1 | 896 | struct bt_ctf_field *struct_field, uint64_t index); |
91f379cb | 897 | |
7fcd5734 JD |
898 | /** |
899 | @brief Sets the field of the @structfield \p struct_field named \p name | |
900 | to the @field \p field. | |
901 | ||
902 | If \p struct_field already contains a field named \p name, then its | |
903 | reference count is decremented, and \p field replaces it. | |
904 | ||
905 | The field type of \p field, as returned by bt_ctf_field_get_type(), | |
906 | \em must be equivalent to the field type returned by | |
907 | bt_ctf_field_type_structure_get_field_type_by_name() with the field | |
908 | type of \p struct_field and the same name, \p name. | |
909 | ||
910 | bt_ctf_trace_get_packet_header_type() for the parent trace class of | |
911 | \p packet. | |
912 | ||
913 | @param[in] struct_field Structure field of which to set the field | |
914 | named \p name. | |
915 | @param[in] name Name of the field to set in \p struct_field. | |
916 | @param[in] field Field named \p name to set in \p struct_field. | |
917 | @returns 0 on success, or -1 on error. | |
918 | ||
919 | @prenotnull{struct_field} | |
920 | @prenotnull{name} | |
921 | @prenotnull{field} | |
922 | @prehot{struct_field} | |
923 | @preisstructfield{struct_field} | |
924 | @pre \p field has a field type equivalent to the field type returned by | |
925 | bt_ctf_field_type_structure_get_field_type_by_name() for the | |
926 | field type of \p struct_field with the name \p name. | |
927 | @postrefcountsame{struct_field} | |
928 | @post <strong>On success, if there's an existing field in | |
929 | \p struct_field named \p name</strong>, its reference count is | |
930 | decremented. | |
931 | @postsuccessrefcountinc{field} | |
932 | ||
933 | @sa bt_ctf_field_structure_get_field_by_index(): Returns the field of a | |
934 | given structure field by index. | |
935 | @sa bt_ctf_field_structure_get_field(): Returns the field of a | |
936 | given structure field by name. | |
937 | */ | |
938 | extern int bt_ctf_field_structure_set_field(struct bt_ctf_field *struct_field, | |
939 | const char *name, struct bt_ctf_field *field); | |
940 | ||
91f379cb PP |
941 | /** @} */ |
942 | ||
943 | /** | |
944 | @defgroup ctfirarrayfield CTF IR array field | |
945 | @ingroup ctfirfields | |
946 | @brief CTF IR array field. | |
947 | ||
948 | @code | |
949 | #include <babeltrace/ctf-ir/fields.h> | |
950 | @endcode | |
951 | ||
952 | A CTF IR <strong><em>array field</em></strong> is a @field which | |
953 | contains an ordered list of zero or more @fields sharing the same @ft, | |
954 | and which is described by a @arrayft. | |
955 | ||
956 | To set the value of a specific field of an array field, you need to | |
957 | first get the field with bt_ctf_field_array_get_field(). | |
958 | ||
959 | @sa ctfirarrayfieldtype | |
960 | @sa ctfirfields | |
961 | ||
962 | @addtogroup ctfirarrayfield | |
963 | @{ | |
964 | */ | |
965 | ||
966 | /** | |
967 | @brief Returns the @field at index \p index, potentially creating it, | |
968 | in the @arrayfield \p array_field. | |
969 | ||
970 | This function creates the @field to return if it does not currently | |
971 | exist. | |
972 | ||
973 | @param[in] array_field Array field of which to get the field | |
974 | at index \p index. | |
975 | @param[in] index Index of the field to get in \p array_field. | |
976 | @returns Field at index \p index in \p array_field, or | |
977 | \c NULL on error. | |
978 | ||
979 | @prenotnull{array_field} | |
980 | @preisarrayfield{array_field} | |
981 | @pre \p index is lesser than bt_ctf_field_type_array_get_length() called | |
982 | on the field type of \p array_field. | |
983 | @postrefcountsame{array_field} | |
984 | @postsuccessrefcountretinc | |
985 | */ | |
986 | extern struct bt_ctf_field *bt_ctf_field_array_get_field( | |
987 | struct bt_ctf_field *array_field, uint64_t index); | |
988 | ||
989 | /** @} */ | |
990 | ||
991 | /** | |
992 | @defgroup ctfirseqfield CTF IR sequence field | |
993 | @ingroup ctfirfields | |
994 | @brief CTF IR sequence field. | |
995 | ||
996 | @code | |
997 | #include <babeltrace/ctf-ir/fields.h> | |
998 | @endcode | |
999 | ||
1000 | A CTF IR <strong><em>sequence field</em></strong> is a @field which | |
1001 | contains an ordered list of zero or more @fields sharing the same @ft, | |
1002 | and which is described by a @seqft. | |
1003 | ||
1004 | Before you can get a specific field of a sequence field with | |
1005 | bt_ctf_field_sequence_get_field(), you need to set its current length | |
1006 | @intfield with bt_ctf_field_sequence_set_length(). The integral value of | |
1007 | the length field of a sequence field indicates the number of fields | |
1008 | it contains. | |
1009 | ||
1010 | @sa ctfirseqfieldtype | |
1011 | @sa ctfirfields | |
1012 | ||
1013 | @addtogroup ctfirseqfield | |
1014 | @{ | |
1015 | */ | |
1016 | ||
1017 | /** | |
1018 | @brief Returns the @field at index \p index, potentially creating it, | |
1019 | in the @seqfield \p sequence_field. | |
1020 | ||
1021 | This function creates the @field to return if it does not currently | |
1022 | exist. | |
1023 | ||
1024 | @param[in] sequence_field Sequence field of which to get the field | |
1025 | at index \p index. | |
1026 | @param[in] index Index of the field to get in | |
1027 | \p sequence_field. | |
1028 | @returns Field at index \p index in | |
1029 | \p sequence_field, or \c NULL on error. | |
1030 | ||
1031 | @prenotnull{sequence_field} | |
1032 | @preisseqfield{sequence_field} | |
1033 | @pre \p sequence_field has a length field previously set with | |
1034 | bt_ctf_field_sequence_set_length(). | |
1035 | @pre \p index is lesser than the current integral value of the current | |
1036 | length field of \p sequence_field (see | |
1037 | bt_ctf_field_sequence_get_length()). | |
1038 | @postrefcountsame{sequence_field} | |
1039 | @postsuccessrefcountretinc | |
1040 | */ | |
1041 | extern struct bt_ctf_field *bt_ctf_field_sequence_get_field( | |
1042 | struct bt_ctf_field *sequence_field, uint64_t index); | |
1043 | ||
1044 | /** | |
1045 | @brief Returns the length @intfield of the @seqfield \p sequence_field. | |
1046 | ||
1047 | The current integral value of the returned length field indicates the | |
1048 | number of fields contained in \p sequence_field. | |
1049 | ||
1050 | @param[in] sequence_field Sequence field of which to get the | |
1051 | length field. | |
1052 | @returns Length field of \p sequence_field, or | |
1053 | \c NULL on error. | |
1054 | ||
1055 | @prenotnull{sequence_field} | |
1056 | @preisseqfield{sequence_field} | |
1057 | @pre \p sequence_field has a length field previously set with | |
1058 | bt_ctf_field_sequence_set_length(). | |
1059 | @postrefcountsame{sequence_field} | |
1060 | @postsuccessrefcountretinc | |
1061 | @post <strong>On success</strong>, the returned field is a @intfield. | |
1062 | ||
1063 | @sa bt_ctf_field_sequence_set_length(): Sets the length field of a given | |
1064 | sequence field. | |
1065 | */ | |
1066 | extern struct bt_ctf_field *bt_ctf_field_sequence_get_length( | |
1067 | struct bt_ctf_field *sequence_field); | |
1068 | ||
1069 | /** | |
1070 | @brief Sets the length @intfield of the @seqfield \p sequence_field | |
1071 | to \p length_field. | |
1072 | ||
1073 | The current integral value of \p length_field indicates the number of | |
1074 | fields contained in \p sequence_field. | |
1075 | ||
1076 | @param[in] sequence_field Sequence field of which to set the | |
1077 | length field. | |
1078 | @param[in] length_field Length field of \p sequence_field. | |
1079 | @returns 0 on success, or a negative value on error. | |
1080 | ||
1081 | @prenotnull{sequence_field} | |
1082 | @prenotnull{length_field} | |
1083 | @preisseqfield{sequence_field} | |
1084 | @preisintfield{length_field} | |
1085 | @prehot{sequence_field} | |
1086 | @postrefcountsame{sequence_field} | |
1087 | @postsuccessrefcountinc{length_field} | |
1088 | ||
1089 | @sa bt_ctf_field_sequence_get_length(): Returns the length field of a | |
1090 | given sequence field. | |
1091 | */ | |
1092 | extern int bt_ctf_field_sequence_set_length(struct bt_ctf_field *sequence_field, | |
1093 | struct bt_ctf_field *length_field); | |
1094 | ||
1095 | /** @} */ | |
1096 | ||
1097 | /** | |
1098 | @defgroup ctfirvarfield CTF IR variant field | |
1099 | @ingroup ctfirfields | |
1100 | @brief CTF IR variant field. | |
1101 | ||
1102 | @code | |
1103 | #include <babeltrace/ctf-ir/fields.h> | |
1104 | @endcode | |
1105 | ||
1106 | A CTF IR <strong><em>variant field</em></strong> is a @field which | |
1107 | contains a current @field amongst one or more choices, and which is | |
1108 | described by a @varft. | |
1109 | ||
1110 | Use bt_ctf_field_variant_get_field() to get the @field selected by | |
1111 | a specific tag @enumfield. Once you call this function, you can call | |
1112 | bt_ctf_field_variant_get_current_field() afterwards to get this last | |
1113 | field again. | |
1114 | ||
1115 | @sa ctfirvarfieldtype | |
1116 | @sa ctfirfields | |
1117 | ||
1118 | @addtogroup ctfirvarfield | |
1119 | @{ | |
1120 | */ | |
1121 | ||
1122 | /** | |
1123 | @brief Returns the @field, potentially creating it, selected by the | |
1124 | tag @intfield \p tag_field in the @varfield \p variant_field. | |
1125 | ||
1126 | This function creates the @field to return if it does not currently | |
1127 | exist. | |
1128 | ||
1129 | Once you call this function, you can call | |
1130 | bt_ctf_field_variant_get_current_field() to get the same field again, | |
1131 | and you can call bt_ctf_field_variant_get_tag() to get \p tag_field. | |
1132 | ||
1133 | @param[in] variant_field Variant field of which to get the field | |
1134 | selected by \p tag_field. | |
1135 | @param[in] tag_field Tag field. | |
1136 | @returns Field selected by \p tag_field in | |
1137 | \p variant_field, or \c NULL on error. | |
1138 | ||
1139 | @prenotnull{variant_field} | |
1140 | @prenotnull{tag_field} | |
1141 | @preisvarfield{variant_field} | |
1142 | @preisenumfield{tag_field} | |
1143 | @postrefcountsame{variant_field} | |
1144 | @postsuccessrefcountinc{tag_field} | |
1145 | @postsuccessrefcountretinc | |
1146 | */ | |
1147 | extern struct bt_ctf_field *bt_ctf_field_variant_get_field( | |
1148 | struct bt_ctf_field *variant_field, | |
1149 | struct bt_ctf_field *tag_field); | |
1150 | ||
1151 | /** | |
1152 | @brief Returns the currently selected @field of the @varfield | |
1153 | \p variant_field. | |
1154 | ||
1155 | @param[in] variant_field Variant field of which to get the | |
1156 | currently selected field. | |
1157 | @returns Currently selected field of | |
1158 | \p variant_field, or \c NULL if there's | |
1159 | no selected field or on error. | |
1160 | ||
1161 | @prenotnull{variant_field} | |
1162 | @preisvarfield{variant_field} | |
1163 | @pre \p variant_field contains has a current selected field previously | |
1164 | set with bt_ctf_field_variant_get_field(). | |
1165 | @postrefcountsame{variant_field} | |
1166 | @postsuccessrefcountretinc | |
1167 | */ | |
1168 | extern struct bt_ctf_field *bt_ctf_field_variant_get_current_field( | |
1169 | struct bt_ctf_field *variant_field); | |
1170 | ||
1171 | /** | |
1172 | @brief Returns the tag @enumfield of the @varfield \p variant_field. | |
1173 | ||
1174 | @param[in] variant_field Variant field of which to get the | |
1175 | tag field. | |
1176 | @returns Tag field of \p variant_field, or | |
1177 | \c NULL on error. | |
1178 | ||
1179 | @prenotnull{variant_field} | |
1180 | @preisvarfield{variant_field} | |
1181 | @pre \p variant_field contains has a current selected field previously | |
1182 | set with bt_ctf_field_variant_get_field(). | |
1183 | @postrefcountsame{variant_field} | |
1184 | @postsuccessrefcountretinc | |
1185 | @post <strong>On success</strong>, the returned field is a @enumfield. | |
1186 | */ | |
1187 | extern struct bt_ctf_field *bt_ctf_field_variant_get_tag( | |
1188 | struct bt_ctf_field *variant_field); | |
1189 | ||
1190 | /** @} */ | |
a39fe52e | 1191 | |
adc315b8 JG |
1192 | #ifdef __cplusplus |
1193 | } | |
1194 | #endif | |
1195 | ||
2e33ac5a | 1196 | #endif /* BABELTRACE_CTF_IR_FIELDS_H */ |