| 1 | #ifndef BABELTRACE_CTF_IR_FIELD_PATH_H |
| 2 | #define BABELTRACE_CTF_IR_FIELD_PATH_H |
| 3 | |
| 4 | /* |
| 5 | * BabelTrace - CTF IR: Field path |
| 6 | * |
| 7 | * Copyright 2016 Philippe Proulx <pproulx@efficios.com> |
| 8 | * |
| 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: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice shall be included in |
| 17 | * all copies or substantial portions of the Software. |
| 18 | * |
| 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 |
| 25 | * SOFTWARE. |
| 26 | * |
| 27 | * The Common Trace Format (CTF) Specification is available at |
| 28 | * http://www.efficios.com/ctf |
| 29 | */ |
| 30 | |
| 31 | #include <stdint.h> |
| 32 | |
| 33 | #ifdef __cplusplus |
| 34 | extern "C" { |
| 35 | #endif |
| 36 | |
| 37 | struct bt_field_type; |
| 38 | |
| 39 | /** |
| 40 | @defgroup ctfirfieldpath CTF IR field path |
| 41 | @ingroup ctfir |
| 42 | @brief CTF IR field path. |
| 43 | |
| 44 | @code |
| 45 | #include <babeltrace/ctf-ir/field-path.h> |
| 46 | @endcode |
| 47 | |
| 48 | A CTF IR <strong><em>field path</em></strong> represents an absolute |
| 49 | path to a field in the hierarchy of a |
| 50 | \link ctfirtraceclass CTF IR trace class\endlink, of a |
| 51 | \link ctfirstreamclass CTF IR stream class\endlink, or of a |
| 52 | \link ctfireventclass CTF IR event class\endlink. |
| 53 | |
| 54 | As a reminder, here's the structure of a CTF packet: |
| 55 | |
| 56 | @imgpacketstructure |
| 57 | |
| 58 | Sequence and variant \link ctfirfieldtypes CTF IR field types\endlink |
| 59 | can return a field path to resp. their length field and tag field |
| 60 | with resp. bt_field_type_sequence_get_length_field_path() and |
| 61 | bt_field_type_variant_get_tag_field_path(). |
| 62 | |
| 63 | A field path has a <em>root scope</em> which indicates from which of the |
| 64 | six CTF scopes to begin. It also has a list of structure field <em>path |
| 65 | indexes</em> which indicate the path to take to reach the destination |
| 66 | field. A path index set to -1 means that you need to continue the lookup |
| 67 | within the current element of an array or sequence field. |
| 68 | |
| 69 | As with any Babeltrace object, CTF IR field path objects have |
| 70 | <a href="https://en.wikipedia.org/wiki/Reference_counting">reference |
| 71 | counts</a>. See \ref refs to learn more about the reference counting |
| 72 | management of Babeltrace objects. |
| 73 | |
| 74 | @file |
| 75 | @brief CTF IR field path type and functions. |
| 76 | @sa ctfirfieldpath |
| 77 | |
| 78 | @addtogroup ctfirfieldpath |
| 79 | @{ |
| 80 | */ |
| 81 | |
| 82 | /** |
| 83 | @struct bt_field_path |
| 84 | @brief A CTF IR field path. |
| 85 | @sa ctfirfieldpath |
| 86 | */ |
| 87 | struct bt_field_path; |
| 88 | |
| 89 | /** |
| 90 | @brief Returns the root scope of the CTF IR field path \p field_path. |
| 91 | |
| 92 | @param[in] field_path Field path of which to get the root scope. |
| 93 | @returns Root scope of \p field_path, or |
| 94 | #BT_SCOPE_UNKNOWN on error. |
| 95 | |
| 96 | @prenotnull{field_path} |
| 97 | @postrefcountsame{field_path} |
| 98 | */ |
| 99 | extern enum bt_scope bt_field_path_get_root_scope( |
| 100 | const struct bt_field_path *field_path); |
| 101 | |
| 102 | /** |
| 103 | @brief Returns the number of path indexes contained in the CTF IR field |
| 104 | path \p field_path. |
| 105 | |
| 106 | @param[in] field_path Field path of which to get the number of |
| 107 | path indexes. |
| 108 | @returns Number of path indexes contained in |
| 109 | \p field_path, or a negative value on error. |
| 110 | |
| 111 | @prenotnull{field_path} |
| 112 | @postrefcountsame{field_path} |
| 113 | */ |
| 114 | extern int64_t bt_field_path_get_index_count( |
| 115 | const struct bt_field_path *field_path); |
| 116 | |
| 117 | /** |
| 118 | @brief Returns the path index contained in the CTF IR field |
| 119 | path \p field_path at index \p index. |
| 120 | |
| 121 | @param[in] field_path Field path of which to get the path index |
| 122 | at index \p index. |
| 123 | @param[in] index Index of path index to get. |
| 124 | @returns Path index of \p field_path at index \p index, |
| 125 | or \c INT_MIN on error. |
| 126 | |
| 127 | @prenotnull{field_path} |
| 128 | @pre \p index is lesser than the number of path indexes contained in the |
| 129 | field path \p field_path (see |
| 130 | bt_field_path_get_index_count()). |
| 131 | @postrefcountsame{field_path} |
| 132 | */ |
| 133 | extern int bt_field_path_get_index( |
| 134 | const struct bt_field_path *field_path, uint64_t index); |
| 135 | |
| 136 | /** @} */ |
| 137 | |
| 138 | #ifdef __cplusplus |
| 139 | } |
| 140 | #endif |
| 141 | |
| 142 | #endif /* BABELTRACE_CTF_IR_FIELD_PATH_H */ |