1 #ifndef BABELTRACE_CTF_IR_EVENT_FIELDS_H
2 #define BABELTRACE_CTF_IR_EVENT_FIELDS_H
5 * BabelTrace - CTF IR: Event Fields
7 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
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
29 * The Common Trace Format (CTF) Specification is available at
30 * http://www.efficios.com/ctf
40 struct bt_ctf_event_class
;
43 struct bt_ctf_field_type
;
46 * bt_ctf_field_create: create an instance of a field.
48 * Allocate a new field of the type described by the bt_ctf_field_type
49 * structure.The creation of a field sets its reference count to 1.
51 * @param type Field type to be instanciated.
53 * Returns an allocated field on success, NULL on error.
55 extern struct bt_ctf_field
*bt_ctf_field_create(
56 struct bt_ctf_field_type
*type
);
59 * bt_ctf_field_structure_get_field: get a structure's field.
61 * Get the structure's field corresponding to the provided field name.
62 * bt_ctf_field_put() must be called on the returned value.
64 * @param structure Structure field instance.
65 * @param name Name of the field in the provided structure.
67 * Returns a field instance on success, NULL on error.
69 extern struct bt_ctf_field
*bt_ctf_field_structure_get_field(
70 struct bt_ctf_field
*structure
, const char *name
);
73 * bt_ctf_field_structure_get_field_by_index: get a structure's field by index.
75 * Get the structure's field corresponding to the provided field name.
76 * bt_ctf_field_put() must be called on the returned value.
77 * The indexes are the same as those provided for bt_ctf_field_type_structure.
79 * @param structure Structure field instance.
80 * @param index Index of the field in the provided structure.
82 * Returns a field instance on success, NULL on error.
84 extern struct bt_ctf_field
*bt_ctf_field_structure_get_field_by_index(
85 struct bt_ctf_field
*structure
, size_t index
);
88 * bt_ctf_field_array_get_field: get an array's field at position "index".
90 * Return the array's field at position "index". bt_ctf_field_put() must be
91 * called on the returned value.
93 * @param array Array field instance.
94 * @param index Position of the array's desired element.
96 * Returns a field instance on success, NULL on error.
98 extern struct bt_ctf_field
*bt_ctf_field_array_get_field(
99 struct bt_ctf_field
*array
, uint64_t index
);
102 * bt_ctf_field_sequence_get_length: get a sequence's length.
104 * Get the sequence's length field.
106 * @param sequence Sequence field instance.
108 * Returns a field instance on success, NULL if a length was never set.
110 extern struct bt_ctf_field
*bt_ctf_field_sequence_get_length(
111 struct bt_ctf_field
*sequence
);
114 * bt_ctf_field_sequence_set_length: set a sequence's length.
116 * Set the sequence's length field.
118 * @param sequence Sequence field instance.
119 * @param length_field Unsigned integer field instance indicating the
122 * Returns 0 on success, a negative value on error.
124 extern int bt_ctf_field_sequence_set_length(struct bt_ctf_field
*sequence
,
125 struct bt_ctf_field
*length_field
);
128 * bt_ctf_field_sequence_get_field: get a sequence's field at position "index".
130 * Return the sequence's field at position "index". The sequence's length must
131 * have been set prior to calling this function using
132 * bt_ctf_field_sequence_set_length().
133 * bt_ctf_field_put() must be called on the returned value.
135 * @param array Sequence field instance.
136 * @param index Position of the sequence's desired element.
138 * Returns a field instance on success, NULL on error.
140 extern struct bt_ctf_field
*bt_ctf_field_sequence_get_field(
141 struct bt_ctf_field
*sequence
, uint64_t index
);
144 * bt_ctf_field_variant_get_field: get a variant's selected field.
146 * Return the variant's selected field. The "tag" field is the selector enum
147 * field. bt_ctf_field_put() must be called on the returned value.
149 * @param variant Variant field instance.
150 * @param tag Selector enumeration field.
152 * Returns a field instance on success, NULL on error.
154 extern struct bt_ctf_field
*bt_ctf_field_variant_get_field(
155 struct bt_ctf_field
*variant
, struct bt_ctf_field
*tag
);
158 * bt_ctf_field_enumeration_get_container: get an enumeration field's container.
160 * Return the enumeration's underlying container field (an integer).
161 * bt_ctf_field_put() must be called on the returned value.
163 * @param enumeration Enumeration field instance.
165 * Returns a field instance on success, NULL on error.
167 extern struct bt_ctf_field
*bt_ctf_field_enumeration_get_container(
168 struct bt_ctf_field
*enumeration
);
171 * bt_ctf_field_enumeration_get_mapping_name: get an enumeration field's mapping
174 * Return the enumeration's underlying container field (an integer).
175 * bt_ctf_field_put() must be called on the returned value.
177 * @param enumeration Enumeration field instance.
179 * Returns a field instance on success, NULL on error.
181 extern const char *bt_ctf_field_enumeration_get_mapping_name(
182 struct bt_ctf_field
*enumeration
);
185 * bt_ctf_field_signed_integer_get_value: get a signed integer field's value
187 * Get a signed integer field's value.
189 * @param integer Signed integer field instance.
190 * @param value Pointer to a signed integer where the value will be stored.
192 * Returns 0 on success, a negative value on error.
194 extern int bt_ctf_field_signed_integer_get_value(struct bt_ctf_field
*integer
,
198 * bt_ctf_field_signed_integer_set_value: set a signed integer field's value
200 * Set a signed integer field's value. The value is checked to make sure it
201 * can be stored in the underlying field.
203 * @param integer Signed integer field instance.
204 * @param value Signed integer field value.
206 * Returns 0 on success, a negative value on error.
208 extern int bt_ctf_field_signed_integer_set_value(struct bt_ctf_field
*integer
,
212 * bt_ctf_field_unsigned_integer_get_value: get unsigned integer field's value
214 * Get an unsigned integer field's value.
216 * @param integer Unsigned integer field instance.
217 * @param value Pointer to an unsigned integer where the value will be stored.
219 * Returns 0 on success, a negative value on error.
221 extern int bt_ctf_field_unsigned_integer_get_value(struct bt_ctf_field
*integer
,
225 * bt_ctf_field_unsigned_integer_set_value: set unsigned integer field's value
227 * Set an unsigned integer field's value. The value is checked to make sure it
228 * can be stored in the underlying field.
230 * @param integer Unsigned integer field instance.
231 * @param value Unsigned integer field value.
233 * Returns 0 on success, a negative value on error.
235 extern int bt_ctf_field_unsigned_integer_set_value(struct bt_ctf_field
*integer
,
239 * bt_ctf_field_floating_point_get_value: get a floating point field's value
241 * Get a floating point field's value.
243 * @param floating_point Floating point field instance.
244 * @param value Pointer to a double where the value will be stored.
246 * Returns 0 on success, a negative value on error.
248 extern int bt_ctf_field_floating_point_get_value(
249 struct bt_ctf_field
*floating_point
, double *value
);
252 * bt_ctf_field_floating_point_set_value: set a floating point field's value
254 * Set a floating point field's value. The underlying type may not support the
255 * double's full precision.
257 * @param floating_point Floating point field instance.
258 * @param value Floating point field value.
260 * Returns 0 on success, a negative value on error.
262 extern int bt_ctf_field_floating_point_set_value(
263 struct bt_ctf_field
*floating_point
,
267 * bt_ctf_field_string_get_value: get a string field's value
269 * Get a string field's value.
271 * @param string_field String field instance.
273 * Returns the string's value, NULL if unset.
275 extern const char *bt_ctf_field_string_get_value(
276 struct bt_ctf_field
*string_field
);
279 * bt_ctf_field_string_set_value: set a string field's value
281 * Set a string field's value.
283 * @param string_field String field instance.
284 * @param value String field value (will be copied).
286 * Returns 0 on success, a negative value on error.
288 extern int bt_ctf_field_string_set_value(struct bt_ctf_field
*string_field
,
292 * bt_ctf_field_get_type: get a field's type
294 * @param field Field intance.
296 * Returns a field type instance on success, NULL on error.
298 extern struct bt_ctf_field_type
*bt_ctf_field_get_type(
299 struct bt_ctf_field
*field
);
302 * bt_ctf_field_get and bt_ctf_field_put: increment and decrement the
303 * field's reference count.
305 * These functions ensure that the field won't be destroyed when it
306 * is in use. The same number of get and put (plus one extra put to
307 * release the initial reference done at creation) have to be done to
310 * When the field's reference count is decremented to 0 by a bt_ctf_field_put,
311 * the field is freed.
313 * @param field Field instance.
315 extern void bt_ctf_field_get(struct bt_ctf_field
*field
);
316 extern void bt_ctf_field_put(struct bt_ctf_field
*field
);
322 #endif /* BABELTRACE_CTF_IR_EVENT_FIELDS_H */
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