| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright (C) 2010-2019 EfficiOS Inc. and Linux Foundation |
| 5 | */ |
| 6 | |
| 7 | #ifndef BABELTRACE2_CTF_WRITER_VISITOR_H |
| 8 | #define BABELTRACE2_CTF_WRITER_VISITOR_H |
| 9 | |
| 10 | #ifdef __cplusplus |
| 11 | extern "C" { |
| 12 | #endif |
| 13 | |
| 14 | /** |
| 15 | @defgroup ctfirvisitor CTF IR visitor |
| 16 | @ingroup ctfir |
| 17 | @brief CTF IR visitor. |
| 18 | |
| 19 | @code |
| 20 | #include <babeltrace2/trace-ir/visitor.h> |
| 21 | @endcode |
| 22 | |
| 23 | A CTF IR <strong><em>visitor</em></strong> is a function that you |
| 24 | can use to visit the hierarchy of a |
| 25 | \link ctfirtraceclass CTF IR trace class\endlink with |
| 26 | bt_ctf_trace_visit() or of a |
| 27 | \link ctfirstreamclass CTF IR stream class\endlink with |
| 28 | bt_ctf_stream_class_visit(). |
| 29 | |
| 30 | The traversal of the object's hierarchy is always done in a |
| 31 | pre-order fashion. |
| 32 | |
| 33 | @sa ctfirstreamclass |
| 34 | @sa ctfirtraceclass |
| 35 | |
| 36 | @file |
| 37 | @brief CTF IR visitor types and functions. |
| 38 | @sa ctfirvisitor |
| 39 | |
| 40 | @addtogroup ctfirvisitor |
| 41 | @{ |
| 42 | */ |
| 43 | |
| 44 | /** |
| 45 | @struct bt_ctf_object |
| 46 | @brief A CTF IR object wrapper. |
| 47 | |
| 48 | This structure wraps both a CTF IR object and its type |
| 49 | (see #bt_ctf_object_type). It is used in the visiting function. |
| 50 | |
| 51 | You can use the bt_ctf_object_get_type() and |
| 52 | bt_ctf_object_get_object() accessors to get the type and wrapped |
| 53 | CTF IR object of a CTF IR object wrapper. |
| 54 | |
| 55 | A CTF IR object wrapper has <strong>no reference count</strong>: do \em |
| 56 | not use bt_ctf_object_put_ref() or bt_ctf_object_get_ref() on it. |
| 57 | |
| 58 | @sa ctfirvisitor |
| 59 | */ |
| 60 | struct bt_ctf_visitor_object; |
| 61 | |
| 62 | /** |
| 63 | @brief CTF IR object wrapper type. |
| 64 | */ |
| 65 | enum bt_ctf_visitor_object_type { |
| 66 | /// Unknown (used for errors). |
| 67 | BT_CTF_VISITOR_OBJECT_TYPE_UNKNOWN = -1, |
| 68 | |
| 69 | /// \ref ctfirtraceclass. |
| 70 | BT_CTF_VISITOR_OBJECT_TYPE_TRACE = 0, |
| 71 | |
| 72 | /// \ref ctfirstreamclass. |
| 73 | BT_CTF_VISITOR_OBJECT_TYPE_STREAM_CLASS = 1, |
| 74 | |
| 75 | /// \ref ctfirstream. |
| 76 | BT_CTF_VISITOR_OBJECT_TYPE_STREAM = 2, |
| 77 | |
| 78 | /// \ref ctfireventclass. |
| 79 | BT_CTF_VISITOR_OBJECT_TYPE_EVENT_CLASS = 3, |
| 80 | |
| 81 | /// \ref ctfirevent. |
| 82 | BT_CTF_VISITOR_OBJECT_TYPE_EVENT = 4, |
| 83 | |
| 84 | /// Number of entries in this enumeration. |
| 85 | BT_CTF_VISITOR_OBJECT_TYPE_NR, |
| 86 | }; |
| 87 | |
| 88 | /** |
| 89 | @brief Visting function type. |
| 90 | |
| 91 | A function of this type is called by bt_ctf_trace_visit() or |
| 92 | bt_ctf_stream_class_visit() when visiting the CTF IR object wrapper |
| 93 | \p object. |
| 94 | |
| 95 | \p object has <strong>no reference count</strong>: do \em not use |
| 96 | bt_ctf_object_put_ref() or bt_ctf_object_get_ref() on it. |
| 97 | |
| 98 | @param[in] object Currently visited CTF IR object wrapper. |
| 99 | @param[in] data User data. |
| 100 | @returns 0 on success, or a negative value on error. |
| 101 | |
| 102 | @prenotnull{object} |
| 103 | |
| 104 | @sa bt_ctf_trace_visit(): Accepts a visitor to visit a trace class. |
| 105 | @sa bt_ctf_stream_class_visit(): Accepts a visitor to visit a stream |
| 106 | class. |
| 107 | */ |
| 108 | typedef int (*bt_ctf_visitor)(struct bt_ctf_visitor_object *object, |
| 109 | void *data); |
| 110 | |
| 111 | /** |
| 112 | @brief Returns the type of the CTF IR object wrapped by the CTF IR |
| 113 | object wrapper \p object. |
| 114 | |
| 115 | @param[in] object Object wrapper of which to get the type. |
| 116 | @returns Type of \p object. |
| 117 | |
| 118 | @prenotnull{object} |
| 119 | |
| 120 | @sa bt_ctf_visitor_object_get_object(): Returns the object wrapped by a given |
| 121 | CTF IR object wrapper. |
| 122 | */ |
| 123 | enum bt_ctf_visitor_object_type bt_ctf_visitor_object_get_type( |
| 124 | struct bt_ctf_visitor_object *object); |
| 125 | |
| 126 | /** |
| 127 | @brief Returns the CTF IR object wrapped by the CTF IR object |
| 128 | wrapper \p object. |
| 129 | |
| 130 | The reference count of \p object is \em not incremented by this |
| 131 | function. On success, you must call bt_ctf_object_get_ref() on the return value to |
| 132 | have your own reference. |
| 133 | |
| 134 | @param[in] object Object wrapper of which to get the wrapped |
| 135 | CTF IR object. |
| 136 | @returns CTF IR object wrapped by \p object. |
| 137 | |
| 138 | @prenotnull{object} |
| 139 | @post The reference count of the returned object is not modified. |
| 140 | |
| 141 | @sa bt_ctf_visitor_object_get_type(): Returns the type of a given |
| 142 | CTF IR object wrapper. |
| 143 | */ |
| 144 | void *bt_ctf_visitor_object_get_object(struct bt_ctf_visitor_object *object); |
| 145 | |
| 146 | /** @} */ |
| 147 | |
| 148 | #ifdef __cplusplus |
| 149 | } |
| 150 | #endif |
| 151 | |
| 152 | #endif /* BABELTRACE2_CTF_WRITER_VISITOR_H */ |