1 #ifndef BABELTRACE_CTF_IR_FIELD_PATH
2 #define BABELTRACE_CTF_IR_FIELD_PATH
5 * BabelTrace - CTF IR: Field path
7 * Copyright 2016 Philippe Proulx <pproulx@efficios.com>
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * The Common Trace Format (CTF) Specification is available at
28 * http://www.efficios.com/ctf
31 #include <babeltrace/ctf-ir/field-types.h>
38 @defgroup ctfirfieldpath CTF IR field path
40 @brief CTF IR field path.
43 #include <babeltrace/ctf-ir/field-path.h>
46 A CTF IR <strong><em>field path</em></strong> represents an absolute
47 path to a field in the hierarchy of a
48 \link ctfirtraceclass CTF IR trace class\endlink, of a
49 \link ctfirstreamclass CTF IR stream class\endlink, or of a
50 \link ctfireventclass CTF IR event class\endlink.
52 As a reminder, here's the structure of a CTF packet:
56 Sequence and variant \link ctfirfieldtypes CTF IR field types\endlink
57 can return a field path to resp. their length field and tag field
58 with resp. bt_ctf_field_type_sequence_get_length_field_path() and
59 bt_ctf_field_type_variant_get_tag_field_path().
61 A field path has a <em>root scope</em> which indicates from which of the
62 six CTF scopes to begin. It also has a list of structure field <em>path
63 indexes</em> which indicate the path to take to reach the destination
64 field. A path index set to -1 means that you need to continue the lookup
65 within the current element of an array or sequence field.
67 As with any Babeltrace object, CTF IR field path objects have
68 <a href="https://en.wikipedia.org/wiki/Reference_counting">reference
69 counts</a>. See \ref refs to learn more about the reference counting
70 management of Babeltrace objects.
73 @brief CTF IR field path type and functions.
76 @addtogroup ctfirfieldpath
81 @struct bt_ctf_field_path
82 @brief A CTF IR field path.
85 struct bt_ctf_field_path
;
88 @brief Returns the root scope of the CTF IR field path \p field_path.
90 @param[in] field_path Field path of which to get the root scope.
91 @returns Root scope of \p field_path, or
92 #BT_CTF_SCOPE_UNKNOWN on error.
94 @prenotnull{field_path}
95 @postrefcountsame{field_path}
97 extern enum bt_ctf_scope
bt_ctf_field_path_get_root_scope(
98 const struct bt_ctf_field_path
*field_path
);
101 @brief Returns the number of path indexes contained in the CTF IR field
104 @param[in] field_path Field path of which to get the number of
106 @returns Number of path indexes contained in
107 \p field_path, or a negative value on error.
109 @prenotnull{field_path}
110 @postrefcountsame{field_path}
112 extern int bt_ctf_field_path_get_index_count(
113 const struct bt_ctf_field_path
*field_path
);
116 @brief Returns the path index contained in the CTF IR field
117 path \p field_path at index \p index.
119 @param[in] field_path Field path of which to get the path index
121 @param[in] index Index of path index to get.
122 @returns Path index of \p field_path at index \p index,
123 or \c INT_MIN on error.
125 @prenotnull{field_path}
126 @pre \p index is lesser than the number of path indexes contained in the
127 field path \p field_path (see
128 bt_ctf_field_path_get_index_count()).
129 @postrefcountsame{field_path}
131 extern int bt_ctf_field_path_get_index(
132 const struct bt_ctf_field_path
*field_path
,
141 #endif /* BABELTRACE_CTF_IR_FIELD_PATH */
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