#include <stdint.h>
#include <stddef.h>
#include <babeltrace/values.h>
+#include <babeltrace/ctf-ir/clock-class.h>
#ifdef __cplusplus
extern "C" {
#endif
-struct bt_ctf_event_class;
+/**
+@defgroup ctfirevent CTF IR event
+@ingroup ctfir
+@brief CTF IR event.
+
+@code
+#include <babeltrace/ctf-ir/event.h>
+@endcode
+
+A CTF IR <strong><em>event</em></strong> is a container of event
+fields:
+
+- <strong>Stream event header</strong> field, described by the
+ <em>stream event header field type</em> of a
+ \link ctfirstreamclass CTF IR stream class\endlink.
+- <strong>Stream event context</strong> field, described by the
+ <em>stream event context field type</em> of a stream class.
+- <strong>Event context</strong> field, described by the
+ <em>event context field type</em> of a
+ \link ctfireventclass CTF IR event class\endlink.
+- <strong>Event payload</strong>, described by the
+ <em>event payload field type</em> of an event class.
+
+As a reminder, here's the structure of a CTF packet:
+
+@imgpacketstructure
+
+You can create a CTF IR event \em from a
+\link ctfireventclass CTF IR event class\endlink with
+bt_ctf_event_create(). The event class you use to create an event
+object becomes its parent.
+
+If the \link ctfirtraceclass CTF IR trace class\endlink of an event
+object (parent of its \link ctfirstreamclass CTF IR stream class\endlink,
+which is the parent of its event class) was created by a
+\link ctfwriter CTF writer\endlink object, then the only possible
+action you can do with this event object is to append it to a
+\link ctfirstream CTF IR stream\endlink with
+bt_ctf_stream_append_event(). Otherwise, you can create an event
+notification with bt_notification_event_create(). The event you pass
+to this function \em must have an attached packet object first.
+
+You can attach a \link ctfirpacket CTF IR packet object\endlink to an
+event object with bt_ctf_event_set_packet().
+
+A CTF IR event has a mapping of
+\link ctfirclockvalue CTF IR clock values\endlink. A clock value is
+an instance of a specific
+\link ctfirclockclass CTF IR clock class\endlink when the event is
+emitted. You can set an event object's clock value with
+bt_ctf_event_set_clock_value().
+
+As with any Babeltrace object, CTF IR event objects have
+<a href="https://en.wikipedia.org/wiki/Reference_counting">reference
+counts</a>. See \ref refs to learn more about the reference counting
+management of Babeltrace objects.
+
+bt_notification_event_create() \em freezes its event parameter on
+success. You cannot modify a frozen event object: it is considered
+immutable, except for \link refs reference counting\endlink.
+
+@sa ctfireventclass
+@sa ctfirpacket
+
+@file
+@brief CTF IR event type and functions.
+@sa ctfirevent
+
+@addtogroup ctfirevent
+@{
+*/
+
+/**
+@struct bt_ctf_event
+@brief A CTF IR event.
+@sa ctfirevent
+*/
struct bt_ctf_event;
+struct bt_ctf_clock;
+struct bt_ctf_clock_value;
+struct bt_ctf_event_class;
struct bt_ctf_field;
struct bt_ctf_field_type;
struct bt_ctf_stream_class;
+struct bt_ctf_packet;
-/*
- * bt_ctf_event_create: instanciate an event.
- *
- * Allocate a new event of the given event class. The creation of an event
- * sets its reference count to 1. Each instance shares the ownership of the
- * event class using its reference count.
- *
- * An event class must be associated with a stream class before events
- * may be instanciated.
- *
- * @param event_class Event class.
- *
- * Returns an allocated field type on success, NULL on error.
- */
+/**
+@name Creation and parent access functions
+@{
+*/
+
+/**
+@brief Creates a default CTF IR event from the CTF IR event class
+ \p event_class.
+
+\p event_class \em must have a parent
+\link ctfirstreamclass CTF IR stream class\endlink.
+
+On success, the four fields of the created event object are not set. You
+can set them with bt_ctf_event_set_header(),
+bt_ctf_event_set_stream_event_context(),
+bt_ctf_event_set_event_context(), and bt_ctf_event_set_event_payload().
+
+This function tries to resolve the needed
+\link ctfirfieldtypes CTF IR field type\endlink of the dynamic field
+types that are found anywhere in the context or payload field
+types of \p event_class and in the root field types of the
+parent stream class of \p event_class. If any automatic resolving fails,
+this function fails. This means that, if any dynamic field type need
+a field type which should be found in the trace packet header root
+field type, and if the parent stream class of \p event_class was not
+added to a \link ctfirtraceclass CTF IR trace class\endlink yet
+with bt_ctf_trace_add_stream_class(), then this function fails.
+
+@param[in] event_class CTF IR event class to use to create the
+ CTF IR event.
+@returns Created event object, or \c NULL on error.
+
+@prenotnull{event_class}
+@pre \p event_class has a parent stream class.
+@postsuccessrefcountret1
+*/
extern struct bt_ctf_event *bt_ctf_event_create(
struct bt_ctf_event_class *event_class);
-/*
- * bt_ctf_event_get_class: get an event's class.
- *
- * @param event Event.
- *
- * Returns the event's class, NULL on error.
- */
+/**
+@brief Returns the parent CTF IR event class of the CTF IR event
+ \p event.
+
+This function returns a reference to the event class which was used to
+create the event object in the first place with bt_ctf_event_create().
+
+@param[in] event Event of which to get the parent event class.
+@returns Parent event class of \p event,
+ or \c NULL on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+*/
extern struct bt_ctf_event_class *bt_ctf_event_get_class(
struct bt_ctf_event *event);
-/*
- * bt_ctf_event_get_stream: get an event's associated stream.
- *
- * @param event Event.
- *
- * Returns the event's associated stream, NULL on error.
- */
+/**
+@brief Returns the CTF IR packet associated to the CTF IR event
+ \p event.
+
+This function returns a reference to the event class which was set to
+\p event in the first place with bt_ctf_event_set_packet().
+
+@param[in] event Event of which to get the associated packet.
+@returns Packet associated to \p event,
+ or \c NULL if no packet is associated to
+ \p event or on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_set_packet(): Associates a given event to a given
+ packet.
+*/
+extern struct bt_ctf_packet *bt_ctf_event_get_packet(
+ struct bt_ctf_event *event);
+
+/**
+@brief Associates the CTF IR event \p event to the CTF IR packet
+ \p packet.
+
+The \link ctfirstreamclass CTF IR stream class\endlink of the
+parent \link ctfirstream CTF IR stream\endlink of \p packet \em must
+be the same as the parent stream class of the
+\link ctfireventclass CTF IR event class\endlink returned
+by bt_ctf_event_get_class() for \p event.
+
+You \em must call this function to create an event-packet association
+before you call bt_notification_event_create() with \p event.
+
+On success, this function also sets the parent stream object of
+\p event to the parent stream of \p packet.
+
+@param[in] event Event to which to associate \p packet.
+@param[in] packet Packet to associate to \p event.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{event}
+@prenotnull{packet}
+@prehot{event}
+@pre The parent stream class of \p packet is the same as the parent
+ stream class of \p event.
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_get_packet(): Returns the associated packet of a
+ given event object.
+*/
+extern int bt_ctf_event_set_packet(struct bt_ctf_event *event,
+ struct bt_ctf_packet *packet);
+
+/**
+@brief Returns the parent CTF IR stream associated to the CTF IR event
+ \p event.
+
+@param[in] event Event of which to get the parent stream.
+@returns Parent stream of \p event, or \c NULL on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+*/
extern struct bt_ctf_stream *bt_ctf_event_get_stream(
struct bt_ctf_event *event);
-/*
- * bt_ctf_event_get_clock: get an event's associated clock.
- *
- * @param event Event.
- *
- * Returns the event's clock, NULL on error.
- */
-extern struct bt_ctf_clock *bt_ctf_event_get_clock(
+/** @} */
+
+/**
+@name Contained fields functions
+@{
+*/
+
+/**
+@brief Returns the stream event header field of the CTF IR event
+ \p event.
+
+@param[in] event Event of which to get the stream event header
+ field.
+@returns Stream event header field of \p event,
+ or \c NULL if the stream event header
+ field is not set or on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_get_header(): Sets the stream event header
+ field of a given event.
+*/
+extern struct bt_ctf_field *bt_ctf_event_get_header(
struct bt_ctf_event *event);
-/*
- * bt_ctf_event_get_payload_field: get an event's payload.
- *
- * @param event Event instance.
- *
- * Returns a field instance on success, NULL on error.
- */
-extern struct bt_ctf_field *bt_ctf_event_get_payload_field(
+/**
+@brief Sets the stream event header field of the CTF IR event
+ \p event to \p header, or unsets the current stream event header field
+ from \p event.
+
+If \p header is not \c NULL, the field type of \p header, as returned by
+bt_ctf_field_get_type(), \em must be equivalent to the field type returned by
+bt_ctf_stream_class_get_event_header_type() for the parent stream class
+of \p event.
+
+@param[in] event Event of which to set the stream event header
+ field.
+@param[in] header Stream event header field.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{event}
+@prehot{event}
+@pre <strong>\p header, if not \c NULL</strong>, has a field type equivalent to
+ the field type returned by bt_ctf_stream_class_get_event_header_type()
+ for the parent stream class of \p event.
+@postrefcountsame{event}
+@post <strong>On success, if \p header is not \c NULL</strong>,
+ the reference count of \p header is incremented.
+
+@sa bt_ctf_event_get_header(): Returns the stream event header field
+ of a given event.
+*/
+extern int bt_ctf_event_set_header(struct bt_ctf_event *event,
+ struct bt_ctf_field *header);
+
+/**
+@brief Returns the stream event context field of the CTF IR event
+ \p event.
+
+@param[in] event Event of which to get the stream event context
+ field.
+@returns Stream event context field of \p event,
+ or \c NULL if the stream event context
+ field is not set or on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_set_stream_event_context(): Sets the stream event context
+ field of a given event.
+*/
+extern struct bt_ctf_field *bt_ctf_event_get_stream_event_context(
struct bt_ctf_event *event);
-/*
- * bt_ctf_event_set_payload_field: set an event's payload.
- *
- * @param event Event instance.
- * @param payload Field instance (must be a structure).
- *
- * Returns 0 on success, a negative value on error.
- */
-extern int bt_ctf_event_set_payload_field(struct bt_ctf_event *event,
+/**
+@brief Sets the stream event context field of the CTF IR event
+ \p event to \p context, or unsets the current stream event context field
+ from \p event.
+
+If \p context is not \c NULL, the field type of \p context, as returned by
+bt_ctf_field_get_type(), \em must be equivalent to the field type returned by
+bt_ctf_stream_class_get_event_context_type() for the parent stream class
+of \p event.
+
+@param[in] event Event of which to set the stream event context field.
+@param[in] context Stream event context field.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{event}
+@prehot{event}
+@pre <strong>\p context, if not \c NULL</strong>, has a field type equivalent to
+ the field type returned by bt_ctf_stream_class_get_event_context_type()
+ for the parent stream class of \p event.
+@postrefcountsame{event}
+@post <strong>On success, if \p context is not \c NULL</strong>, the reference
+ count of \p context is incremented.
+
+@sa bt_ctf_event_get_stream_event_context(): Returns the stream event context
+ field of a given event.
+*/
+extern int bt_ctf_event_set_stream_event_context(struct bt_ctf_event *event,
+ struct bt_ctf_field *context);
+
+/**
+@brief Returns the event context field of the CTF IR event \p event.
+
+@param[in] event Event of which to get the context field.
+@returns Event context field of \p event, or \c NULL if the
+ event context field is not set or on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_set_event_context(): Sets the event context field of a given
+ event.
+*/
+extern struct bt_ctf_field *bt_ctf_event_get_event_context(
+ struct bt_ctf_event *event);
+
+/**
+@brief Sets the event context field of the CTF IR event \p event to \p context,
+ or unsets the current event context field from \p event.
+
+If \p context is not \c NULL, the field type of \p context, as returned by
+bt_ctf_field_get_type(), \em must be equivalent to the field type returned by
+bt_ctf_event_class_get_context_type() for the parent class of \p event.
+
+@param[in] event Event of which to set the context field.
+@param[in] context Event context field.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{event}
+@prehot{event}
+@pre <strong>\p context, if not \c NULL</strong>, has a field type equivalent to
+ the field type returned by bt_ctf_event_class_get_context_type() for the
+ parent class of \p event.
+@postrefcountsame{event}
+@post <strong>On success, if \p context is not \c NULL</strong>, the reference
+ count of \p context is incremented.
+
+@sa bt_ctf_event_get_context(): Returns the context field of a given event.
+*/
+extern int bt_ctf_event_set_event_context(struct bt_ctf_event *event,
+ struct bt_ctf_field *context);
+
+/**
+@brief Returns the payload field of the CTF IR event \p event.
+
+@param[in] event Event of which to get the payload field.
+@returns Payload field of \p event, or \c NULL if the payload
+ field is not set or on error.
+
+@prenotnull{event}
+@postrefcountsame{event}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_set_event_payload(): Sets the payload field of a given
+ event.
+*/
+extern struct bt_ctf_field *bt_ctf_event_get_event_payload(
+ struct bt_ctf_event *event);
+
+/**
+@brief Sets the payload field of the CTF IR event \p event to \p payload,
+ or unsets the current event payload field from \p event.
+
+If \p payload is not \c NULL, the field type of \p payload, as returned by
+bt_ctf_field_get_type(), \em must be equivalent to the field type returned by
+bt_ctf_event_class_get_payload_type() for the parent class of \p event.
+
+@param[in] event Event of which to set the payload field.
+@param[in] payload Event payload field.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{event}
+@prehot{event}
+@pre <strong>\p payload, if not \c NULL</strong>, has a field type equivalent to
+ the field typereturned by bt_ctf_event_class_get_payload_type() for the
+ parent class of \p event.
+@postrefcountsame{event}
+@post <strong>On success, if \p payload is not \c NULL</strong>, the reference
+ count of \p payload is incremented.
+
+@sa bt_ctf_event_get_payload(): Returns the payload field of a given event.
+*/
+extern int bt_ctf_event_set_event_payload(struct bt_ctf_event *event,
struct bt_ctf_field *payload);
+/** @cond DOCUMENT */
+
/*
+ * TODO: Doxygenize.
+ *
* bt_ctf_event_get_payload: get an event's field.
*
- * Returns the field matching "name". bt_ctf_field_put() must be called on the
+ * Returns the field matching "name". bt_put() must be called on the
* returned value.
*
* @param event Event instance.
const char *name);
/*
- * bt_ctf_event_set_payload: set an event's field.
- *
- * Set a manually allocated field as an event's payload. The event will share
- * the field's ownership by using its reference count.
- * bt_ctf_field_put() must be called on the returned value.
- *
- * @param event Event instance.
- * @param name Event field name, see notes.
- * @param value Instance of a field whose type corresponds to the event's field.
- *
- * Returns 0 on success, a negative value on error.
+ * TODO: Doxygenize.
*
- * Note: The function will return an error if a name is provided and the payload
- * type is not a structure. If name is NULL, the payload field will be set
- * directly and must match the event class' payload's type.
- */
-extern int bt_ctf_event_set_payload(struct bt_ctf_event *event,
- const char *name,
- struct bt_ctf_field *value);
-
-/*
* bt_ctf_event_get_payload_by_index: Get event's field by index.
*
- * Returns the field associated with the provided index. bt_ctf_field_put()
+ * Returns the field associated with the provided index. bt_put()
* must be called on the returned value. The indexes to be provided are
* the same as can be retrieved from the event class.
*
* Note: Will return an error if the payload's type is not a structure.
*/
extern struct bt_ctf_field *bt_ctf_event_get_payload_by_index(
- struct bt_ctf_event *event, int index);
+ struct bt_ctf_event *event, uint64_t index);
/*
- * bt_ctf_event_get_header: get an event's header.
+ * TODO: Doxygenize.
*
- * @param event Event instance.
- *
- * Returns a field instance on success, NULL on error.
- */
-extern struct bt_ctf_field *bt_ctf_event_get_header(
- struct bt_ctf_event *event);
-
-/*
- * bt_ctf_event_set_header: set an event's header.
+ * bt_ctf_event_set_payload: set an event's field.
*
- * The event header's type must match the stream class' event
- * header type.
+ * Set a manually allocated field as an event's payload. The event will share
+ * the field's ownership by using its reference count.
+ * bt_put() must be called on the returned value.
*
* @param event Event instance.
- * @param header Event header field instance.
+ * @param name Event field name, see notes.
+ * @param value Instance of a field whose type corresponds to the event's field.
*
- * Returns a field instance on success, NULL on error.
+ * Returns 0 on success, a negative value on error.
+ *
+ * Note: The function will return an error if a name is provided and the payload
+ * type is not a structure. If name is NULL, the payload field will be set
+ * directly and must match the event class' payload's type.
*/
-extern int bt_ctf_event_set_header(
+extern int bt_ctf_event_set_payload(struct bt_ctf_event *event,
+ const char *name,
+ struct bt_ctf_field *value);
+
+/** @endcond */
+
+/** @} */
+
+/**
+@name Clock value functions
+@{
+*/
+
+/**
+@brief Returns the value, as of the CTF IR event \p event, of the
+ clock described by the
+ \link ctfirclockclass CTF IR clock class\endlink \p clock_class.
+
+@param[in] event Event of which to get the value of the clock
+ described by \p clock_class.
+@param[in] clock_class Class of the clock of which to get the value.
+@returns Value of the clock described by \p clock_class
+ as of \p event.
+
+@prenotnull{event}
+@prenotnull{clock_class}
+@postrefcountsame{event}
+@postrefcountsame{clock_class}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_event_set_clock_value(): Sets the clock value of a given event.
+*/
+extern struct bt_ctf_clock_value *bt_ctf_event_get_clock_value(
struct bt_ctf_event *event,
- struct bt_ctf_field *header);
+ struct bt_ctf_clock_class *clock_class);
-/*
- * bt_ctf_event_get_event_context: Get an event's context
- *
- * @param event_class Event class.
- *
- * Returns a field on success (a structure), NULL on error.
- *
- * Note: This function is named this way instead of the expected
- * "bt_ctf_event_get_context" in order to work around a name clash with
- * an unrelated function bearing this name in context.h.
- */
-extern struct bt_ctf_field *bt_ctf_event_get_event_context(
- struct bt_ctf_event *event);
+/**
+@brief Sets the value, as of the CTF IR event \p event, of the
+ clock described by its \link ctfirclockclass CTF IR
+ clock class\endlink.
-/*
- * bt_ctf_event_set_event_context: Set an event's context
- *
- * @param event Event.
- * @param context Event context field (must match the event class'
- * context type).
- *
- * Returns 0 on success, a negative value on error.
- */
-extern int bt_ctf_event_set_event_context(struct bt_ctf_event *event,
- struct bt_ctf_field *context);
+@param[in] event Event of which to set the value of the clock
+ described by the clock class of \p clock_value.
+@param[in] clock_value Value of the clock described by its clock class
+ as of \p event.
+@returns 0 on success, or a negative value on error.
-/*
- * bt_ctf_event_copy: Deep-copy an event.
- *
- * Get an event's deep copy.
- *
- * On success, the returned copy has its reference count set to 1.
- *
- * @param event Event to copy.
- *
- * Returns the deep-copied event on success, NULL on error.
- */
-extern struct bt_ctf_event *bt_ctf_event_copy(struct bt_ctf_event *event);
+@prenotnull{event}
+@prenotnull{clock_value}
+@prehot{event}
+@postrefcountsame{event}
-/*
- * bt_ctf_event_get and bt_ctf_event_put: increment and decrement
- * the event's reference count.
- *
- * You may also use bt_ctf_get() and bt_ctf_put() with event objects.
- *
- * These functions ensure that the event won't be destroyed while it
- * is in use. The same number of get and put (plus one extra put to
- * release the initial reference done at creation) have to be done to
- * destroy an event.
- *
- * When the event's reference count is decremented to 0 by a
- * bt_ctf_event_put, the event is freed.
- *
- * @param event Event instance.
- */
-extern void bt_ctf_event_get(struct bt_ctf_event *event);
-extern void bt_ctf_event_put(struct bt_ctf_event *event);
+@sa bt_ctf_event_get_clock_value(): Returns the clock value of
+ a given event.
+*/
+extern int bt_ctf_event_set_clock_value(
+ struct bt_ctf_event *event,
+ struct bt_ctf_clock_value *clock_value);
+
+/** @} */
+
+/** @} */
#ifdef __cplusplus
}
projects / babeltrace.git / blobdiff