extern "C" {
#endif
-struct bt_ctf_ir_element;
-
-enum bt_ctf_ir_type {
- BT_CTF_IR_TYPE_UNKNOWN = -1,
- BT_CTF_IR_TYPE_TRACE = 0,
- BT_CTF_IR_TYPE_STREAM_CLASS = 1,
- BT_CTF_IR_TYPE_STREAM = 2,
- BT_CTF_IR_TYPE_EVENT_CLASS = 3,
- BT_CTF_IR_TYPE_EVENT = 4,
- BT_CTF_IR_TYPE_NR,
+/**
+@defgroup ctfirvisitor CTF IR visitor
+@ingroup ctfir
+@brief CTF IR visitor.
+
+@code
+#include <babeltrace/ctf-ir/visitor.h>
+@endcode
+
+A CTF IR <strong><em>visitor</em></strong> is a function that you
+can use to visit the hierarchy of a
+\link ctfirtraceclass CTF IR trace class\endlink with
+bt_trace_visit() or of a
+\link ctfirstreamclass CTF IR stream class\endlink with
+bt_stream_class_visit().
+
+The traversal of the object's hierarchy is always done in a
+pre-order fashion.
+
+@sa ctfirstreamclass
+@sa ctfirtraceclass
+
+@file
+@brief CTF IR visitor types and functions.
+@sa ctfirvisitor
+
+@addtogroup ctfirvisitor
+@{
+*/
+
+/**
+@struct bt_object
+@brief A CTF IR object wrapper.
+
+This structure wraps both a CTF IR object and its type
+(see #bt_object_type). It is used in the visiting function.
+
+You can use the bt_object_get_type() and
+bt_object_get_object() accessors to get the type and wrapped
+CTF IR object of a CTF IR object wrapper.
+
+A CTF IR object wrapper has <strong>no reference count</strong>: do \em
+not use bt_put() or bt_get() on it.
+
+@sa ctfirvisitor
+*/
+struct bt_visitor_object;
+
+/**
+@brief CTF IR object wrapper type.
+*/
+enum bt_visitor_object_type {
+ /// Unknown (used for errors).
+ BT_VISITOR_OBJECT_TYPE_UNKNOWN = -1,
+
+ /// \ref ctfirtraceclass.
+ BT_VISITOR_OBJECT_TYPE_TRACE = 0,
+
+ /// \ref ctfirstreamclass.
+ BT_VISITOR_OBJECT_TYPE_STREAM_CLASS = 1,
+
+ /// \ref ctfirstream.
+ BT_VISITOR_OBJECT_TYPE_STREAM = 2,
+
+ /// \ref ctfireventclass.
+ BT_VISITOR_OBJECT_TYPE_EVENT_CLASS = 3,
+
+ /// \ref ctfirevent.
+ BT_VISITOR_OBJECT_TYPE_EVENT = 4,
+
+ /// Number of entries in this enumeration.
+ BT_VISITOR_OBJECT_TYPE_NR,
};
-typedef int (*bt_ctf_ir_visitor)(struct bt_ctf_ir_element *element,
+/**
+@brief Visting function type.
+
+A function of this type is called by bt_trace_visit() or
+bt_stream_class_visit() when visiting the CTF IR object wrapper
+\p object.
+
+\p object has <strong>no reference count</strong>: do \em not use
+bt_put() or bt_get() on it.
+
+@param[in] object Currently visited CTF IR object wrapper.
+@param[in] data User data.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{object}
+
+@sa bt_trace_visit(): Accepts a visitor to visit a trace class.
+@sa bt_stream_class_visit(): Accepts a visitor to visit a stream
+ class.
+*/
+typedef int (*bt_visitor)(struct bt_visitor_object *object,
void *data);
-/*
- * bt_ctf_ir_element_get_type: get an IR element's type.
- *
- * Get an IR element's type.
- *
- * @param element Element instance.
- *
- * Returns one of #bt_ctf_ir_type.
- */
-enum bt_ctf_ir_type bt_ctf_ir_element_get_type(
- struct bt_ctf_ir_element *element);
+/**
+@brief Returns the type of the CTF IR object wrapped by the CTF IR
+ object wrapper \p object.
-/*
- * bt_ctf_ir_element_get_element: get an IR element's value.
- *
- * Get an IR element's value.
- *
- * @param element Element instance.
- *
- * Returns a CTF-IR type. Use #bt_ctf_ir_type to determine the
- * concrete type of the value returned.
- */
-void *bt_ctf_ir_element_get_element(struct bt_ctf_ir_element *element);
+@param[in] object Object wrapper of which to get the type.
+@returns Type of \p object.
+
+@prenotnull{object}
+
+@sa bt_visitor_object_get_object(): Returns the object wrapped by a given
+ CTF IR object wrapper.
+*/
+enum bt_visitor_object_type bt_visitor_object_get_type(
+ struct bt_visitor_object *object);
+
+/**
+@brief Returns the CTF IR object wrapped by the CTF IR object
+ wrapper \p object.
+
+The reference count of \p object is \em not incremented by this
+function. On success, you must call bt_get() on the return value to
+have your own reference.
+
+@param[in] object Object wrapper of which to get the wrapped
+ CTF IR object.
+@returns CTF IR object wrapped by \p object.
+
+@prenotnull{object}
+@post The reference count of the returned object is not modified.
+
+@sa bt_visitor_object_get_type(): Returns the type of a given
+ CTF IR object wrapper.
+*/
+void *bt_visitor_object_get_object(struct bt_visitor_object *object);
+
+/** @} */
#ifdef __cplusplus
}
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