[babeltrace.git] / include / babeltrace / ctf-ir / field-types.h

#ifndef BABELTRACE_CTF_IR_FIELD_TYPES_H
#define BABELTRACE_CTF_IR_FIELD_TYPES_H

/*
 * BabelTrace - CTF IR: Event field types
 *
 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * The Common Trace Format (CTF) Specification is available at
 * http://www.efficios.com/ctf
 */

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
@defgroup ctfirfieldtypes CTF IR field types
@ingroup ctfir
@brief CTF IR field types.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>field type</em></strong> is a field type that you
can use to create concrete \link ctfirfields CTF IR fields\endlink.

You can create a CTF IR field object from a CTF IR field type object
with bt_ctf_field_create().

In the CTF IR hierarchy, you can set the root field types of three
objects:

- \ref ctfirtraceclass
  - Trace packet header field type: bt_ctf_trace_set_packet_header_type().
- \ref ctfirstreamclass
  - Stream packet context field type:
    bt_ctf_stream_class_set_packet_context_type().
  - Stream event header field type:
    bt_ctf_stream_class_set_event_header_type().
  - Stream event context field type:
    bt_ctf_stream_class_set_event_context_type().
- \ref ctfireventclass
  - Event context field type: bt_ctf_event_class_set_context_type().
  - Event payload field type: bt_ctf_event_class_set_payload_type().

As of Babeltrace \btversion, those six previous "root" field types
\em must be structure field types.

If, at any level within a given root field type, you add a sequence or a
variant field type, you do not need to specify its associated length
or tag field type: the length or tag string is enough for the Babeltrace
system to resolve the appropriate field type depending on where this
dynamic field type is located within the whole hierarchy. It is
guaranteed that this automatic resolving is performed for all the field
types contained in a given
\link ctfirstreamclass CTF IR stream class\endlink (and in its
children \link ctfireventclass CTF IR event classes\endlink) once you
add it to a \link ctfirtraceclass CTF IR trace class\endlink with
bt_ctf_trace_add_stream_class(). Once a stream class is the child of
a trace class, this automatic resolving is performed for the field
types of an event class when you add it with
bt_ctf_stream_class_add_event_class(). If the system cannot find a path
to a field in the hierarchy for a dynamic field type, the adding
function fails.

The standard CTF field types are:

<table>
  <tr>
    <th>Type ID
    <th>CTF IR field type
    <th>CTF IR field which you can create from this field type
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_INTEGER
    <td>\ref ctfirintfieldtype
    <td>\ref ctfirintfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_FLOAT
    <td>\ref ctfirfloatfieldtype
    <td>\ref ctfirfloatfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_ENUM
    <td>\ref ctfirenumfieldtype
    <td>\ref ctfirenumfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_STRING
    <td>\ref ctfirstringfieldtype
    <td>\ref ctfirstringfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_STRUCT
    <td>\ref ctfirstructfieldtype
    <td>\ref ctfirstructfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_ARRAY
    <td>\ref ctfirarrayfieldtype
    <td>\ref ctfirarrayfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_SEQUENCE
    <td>\ref ctfirseqfieldtype
    <td>\ref ctfirseqfield
  </tr>
  <tr>
    <td>#BT_CTF_TYPE_ID_VARIANT
    <td>\ref ctfirvarfieldtype
    <td>\ref ctfirvarfield
  </tr>
</table>

Each field type has its own <strong>type ID</strong> (see
#bt_ctf_type_id). You get the type ID of a field type object
with bt_ctf_field_type_get_type_id().

You can get a deep copy of a field type with bt_ctf_field_type_copy().
This function resets, in the field type copy, the resolved field type
of the dynamic field types. The automatic resolving can be done again
when you eventually call bt_ctf_event_create(),
bt_ctf_stream_class_add_event_class(), or
bt_ctf_trace_add_stream_class().

You \em must always use bt_ctf_field_type_compare() to compare two
field types. Since some parts of the Babeltrace system can copy field
types behind the scenes, you \em cannot rely on a simple field type
pointer comparison.

As with any Babeltrace object, CTF IR field type 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.

The following functions can \em freeze field type objects:

- bt_ctf_field_create() freezes its field type parameter.
- bt_ctf_stream_class_add_event_class(), if its
  \link ctfirstreamclass CTF IR stream class\endlink parameter has a
  \link ctfirtraceclass CTF IR trace class\endlink parent, freezes
  the root field types of its
  \link ctfireventclass CTF IR event class\endlink parameter.
- bt_ctf_trace_add_stream_class() freezes the root field types of the
  whole trace class hierarchy (trace class, children stream classes,
  and their children event classes).
- bt_ctf_writer_create_stream() freezes the root field types of the
  whole CTF writer's trace class hierarchy.
- bt_ctf_event_create() freezes the root field types of its event class
  parameter and of ther parent stream class of this event class.

@sa ctfirfields

@file
@brief CTF IR field type type and functions.
@sa ctfirfieldtypes

@addtogroup ctfirfieldtypes
@{
*/

/**
@struct bt_ctf_field_type
@brief A CTF IR field type.
@sa ctfirfieldtypes
*/
struct bt_ctf_field_type;
struct bt_ctf_event_class;
struct bt_ctf_event;
struct bt_ctf_field;
struct bt_ctf_field_path;

/** @cond DOCUMENT */

/*
 * Babeltrace 1.x enumerations that were also used in CTF writer's API.
 * They are left here for backward compatibility reasons, but
 * enum bt_ctf_type_id and enum bt_ctf_string_encoding should be used
 * in new code. Both new enumerations are compatible with their legacy
 * counterpart.
 */
enum ctf_type_id {
	CTF_TYPE_UNKNOWN = 0,
	CTF_TYPE_INTEGER,
	CTF_TYPE_FLOAT,
	CTF_TYPE_ENUM,
	CTF_TYPE_STRING,
	CTF_TYPE_STRUCT,
	CTF_TYPE_UNTAGGED_VARIANT,
	CTF_TYPE_VARIANT,
	CTF_TYPE_ARRAY,
	CTF_TYPE_SEQUENCE,
	NR_CTF_TYPES,
};

/*
 * Old enum.
 */
enum ctf_string_encoding {
	CTF_STRING_NONE = 0,
	CTF_STRING_UTF8,
	CTF_STRING_ASCII,
	CTF_STRING_UNKNOWN,
};

/** @endcond */

/**
@brief	CTF scope.
*/
enum bt_ctf_scope {
	/// Unknown, used for errors.
	BT_CTF_SCOPE_UNKNOWN = -1,

	/// Trace packet header.
	BT_CTF_SCOPE_TRACE_PACKET_HEADER = 1,

	/// Stream packet context.
	BT_CTF_SCOPE_STREAM_PACKET_CONTEXT = 2,

	/// Stream event header.
	BT_CTF_SCOPE_STREAM_EVENT_HEADER = 3,

	/// Stream event context.
	BT_CTF_SCOPE_STREAM_EVENT_CONTEXT = 4,

	/// Event context.
	BT_CTF_SCOPE_EVENT_CONTEXT = 5,

	/// Event payload.
	BT_CTF_SCOPE_EVENT_PAYLOAD = 6,

	/// @cond DOCUMENT
	BT_CTF_SCOPE_ENV = 0,
	BT_CTF_SCOPE_EVENT_FIELDS = 6,
	/// @endcond
};

/**
@name Type information
@{
*/

/**
@brief	Type ID of a CTF IR field type.
*/
enum bt_ctf_type_id {
	/// Unknown, used for errors.
	BT_CTF_TYPE_ID_UNKNOWN = CTF_TYPE_UNKNOWN,

	/// \ref ctfirintfieldtype
	BT_CTF_TYPE_ID_INTEGER = CTF_TYPE_INTEGER,

	/// \ref ctfirfloatfieldtype
	BT_CTF_TYPE_ID_FLOAT = CTF_TYPE_FLOAT,

	/// \ref ctfirenumfieldtype
	BT_CTF_TYPE_ID_ENUM = CTF_TYPE_ENUM,

	/// \ref ctfirstringfieldtype
	BT_CTF_TYPE_ID_STRING = CTF_TYPE_STRING,

	/// \ref ctfirstructfieldtype
	BT_CTF_TYPE_ID_STRUCT = CTF_TYPE_STRUCT,

	/// @cond DOCUMENT
	BT_CTF_TYPE_ID_UNTAGGED_VARIANT = CTF_TYPE_UNTAGGED_VARIANT,
	/// @endcond

	/// \ref ctfirarrayfieldtype
	BT_CTF_TYPE_ID_ARRAY = CTF_TYPE_ARRAY,

	/// \ref ctfirseqfieldtype
	BT_CTF_TYPE_ID_SEQUENCE = CTF_TYPE_SEQUENCE,

	/// \ref ctfirvarfieldtype
	BT_CTF_TYPE_ID_VARIANT = CTF_TYPE_VARIANT,

	/// Number of enumeration entries.
	BT_CTF_NR_TYPE_IDS = NR_CTF_TYPES,
};

/**
@brief	Returns the type ID of the CTF IR field type \p field_type.

@param[in] field_type	Field type of which to get the type ID.
@returns		Type ID of \p field_type,
			or #BT_CTF_TYPE_ID_UNKNOWN on error.

@prenotnull{field_type}
@postrefcountsame{field_type}

@sa #bt_ctf_type_id: CTF IR field type ID.
@sa bt_ctf_field_type_is_integer(): Returns whether or not a given
	field type is an integer field type.
@sa bt_ctf_field_type_is_floating_point(): Returns whether or not a
	given field type is a floating point number field type.
@sa bt_ctf_field_type_is_enumeration(): Returns whether or not a given
	field type is an enumeration field type.
@sa bt_ctf_field_type_is_string(): Returns whether or not a given
	field type is a string field type.
@sa bt_ctf_field_type_is_structure(): Returns whether or not a given
	field type is a structure field type.
@sa bt_ctf_field_type_is_array(): Returns whether or not a given
	field type is an array field type.
@sa bt_ctf_field_type_is_sequence(): Returns whether or not a given
	field type is a sequence field type.
@sa bt_ctf_field_type_is_variant(): Returns whether or not a given
	field type is a variant field type.
*/
extern enum bt_ctf_type_id bt_ctf_field_type_get_type_id(
		struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	an integer field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is an integer field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@prenotnull{field_type}
@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_integer(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	a floating point number field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is a floating point
			number field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_floating_point(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	an enumeration field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is an enumeration field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_enumeration(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	a string field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is a string field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_string(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	a structure field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is a structure field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_structure(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	an array field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is an array field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_array(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	a sequence field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is a sequence field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_sequence(struct bt_ctf_field_type *field_type);

/**
@brief	Returns whether or not the CTF IR field type \p field_type is
	a variant field type.

@param[in] field_type	Field type to check (can be \c NULL).
@returns		1 if \p field_type is a variant field type,
			or 0 otherwise (including if \p field_type is
			\c NULL).

@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_type_id(): Returns the type ID of a given
	field type.
*/
extern int bt_ctf_field_type_is_variant(struct bt_ctf_field_type *field_type);

/** @} */

/**
@name Common properties types and functions
@{
*/

/**
@brief	<a href="https://en.wikipedia.org/wiki/Endianness">Byte order</a>
	of a CTF IR field type.
*/
enum bt_ctf_byte_order {
	/// Unknown, used for errors.
	BT_CTF_BYTE_ORDER_UNKNOWN = -1,

	/*
	 * Note that native, in the context of the CTF specification, is defined
	 * as "the byte order described in the trace" and does not mean that the
	 * host's endianness will be used.
	 */
	/// Native (default) byte order.
	BT_CTF_BYTE_ORDER_NATIVE = 0,

	/// Little-endian.
	BT_CTF_BYTE_ORDER_LITTLE_ENDIAN,

	/// Big-endian.
	BT_CTF_BYTE_ORDER_BIG_ENDIAN,

	/// Network byte order (big-endian).
	BT_CTF_BYTE_ORDER_NETWORK,
};

/**
@brief	String encoding of a CTF IR field type.
*/
enum bt_ctf_string_encoding {
	/// Unknown, used for errors.
	BT_CTF_STRING_ENCODING_UNKNOWN = CTF_STRING_UNKNOWN,

	/// No encoding.
	BT_CTF_STRING_ENCODING_NONE = CTF_STRING_NONE,

	/// <a href="https://en.wikipedia.org/wiki/UTF-8">UTF-8</a>.
	BT_CTF_STRING_ENCODING_UTF8 = CTF_STRING_UTF8,

	/// <a href="https://en.wikipedia.org/wiki/ASCII">ASCII</a>.
	BT_CTF_STRING_ENCODING_ASCII = CTF_STRING_ASCII,
};

/**
@brief  Returns the alignment of the CTF IR fields described by
	the CTF IR field type \p field_type.

@param[in] field_type	Field type which describes the
			fields of which to get the alignment.
@returns		Alignment of the fields described by
			\p field_type, or a negative value on error.

@prenotnull{field_type}
@postrefcountsame{field_type}

@sa bt_ctf_field_type_set_alignment(): Sets the alignment
	of the fields described by a given field type.
*/
extern int bt_ctf_field_type_get_alignment(
		struct bt_ctf_field_type *field_type);

/**
@brief  Sets the alignment of the CTF IR fields described by the
	CTF IR field type \p field_type to \p alignment.

\p alignment \em must be greater than 0 and a power of two.

@param[in] field_type	Field type which describes the fields of
			which to set the alignment.
@param[in] alignment	Alignment of the fields described by
			\p field_type.
@returns		0 on success, or a negative value on error.

@prenotnull{field_type}
@prehot{field_type}
@pre \p alignment is greater than 0 and a power of two.
@postrefcountsame{field_type}

@sa bt_ctf_field_type_get_alignment(): Returns the alignment of the
	fields described by a given field type.
*/
extern int bt_ctf_field_type_set_alignment(struct bt_ctf_field_type *field_type,
		unsigned int alignment);

/**
@brief  Returns the byte order of the CTF IR fields described by
	the CTF IR field type \p field_type.

You can only call this function if \p field_type is a
\link ctfirintfieldtype CTF IR integer field type\endlink,
a \link ctfirfloatfieldtype CTF IR floating point number field type\endlink,
or a \link ctfirenumfieldtype CTF IR enumeration field type\endlink.

@param[in] field_type	Field type which describes the
			fields of which to get the byte order.
@returns		Byte order of the fields described by
			\p field_type, or #BT_CTF_BYTE_ORDER_UNKNOWN on
			error.

@prenotnull{field_type}
@pre \p field_type is an integer field type, a floating point number
	field type, or an enumeration field type.
@postrefcountsame{field_type}

@sa bt_ctf_field_type_set_byte_order(): Sets the byte order
	of the fields described by a given field type.
*/
extern enum bt_ctf_byte_order bt_ctf_field_type_get_byte_order(
		struct bt_ctf_field_type *field_type);

/**
@brief  Sets the byte order of the CTF IR fields described by the
	CTF IR field type \p field_type to \p byte_order.

If \p field_type is a compound field type, this function also
recursively sets the byte order of its children to \p byte_order.

@param[in] field_type	Field type which describes the fields of
			which to set the byte order.
@param[in] byte_order	Alignment of the fields described by
			\p field_type.
@returns		0 on success, or a negative value on error.

@prenotnull{field_type}
@prehot{field_type}
@pre \p byte_order is #BT_CTF_BYTE_ORDER_NATIVE,
	#BT_CTF_BYTE_ORDER_LITTLE_ENDIAN, #BT_CTF_BYTE_ORDER_BIG_ENDIAN,
	or #BT_CTF_BYTE_ORDER_NETWORK.
@postrefcountsame{field_type}F

@sa bt_ctf_field_type_get_byte_order(): Returns the byte order of the
	fields described by a given field type.
*/
extern int bt_ctf_field_type_set_byte_order(
		struct bt_ctf_field_type *field_type,
		enum bt_ctf_byte_order byte_order);

/** @} */

/**
@name Utility functions
@{
*/

/**
@brief	Returns whether or not the CTF IR field type \p field_type_a
	is equivalent to the field type \p field_type_b.

You \em must use this function to compare two field types: it is not
safe to compare two pointer values directly, because, for internal
reasons, some parts of the Babeltrace system can copy user field types
and discard the original ones.

@param[in] field_type_a	Field type to compare to \p field_type_b.
@param[in] field_type_b Field type to compare to \p field_type_a.
@returns		0 if \p field_type_a is equivalent to
			\p field_type_b, 1 if they are not equivalent,
			or a negative value on error.

@prenotnull{field_type_a}
@prenotnull{field_type_b}
@postrefcountsame{field_type_a}
@postrefcountsame{field_type_b}
*/
extern int bt_ctf_field_type_compare(struct bt_ctf_field_type *field_type_a,
		struct bt_ctf_field_type *field_type_b);

/**
@brief	Creates a \em deep copy of the CTF IR field type \p field_type.

You can copy a frozen field type: the resulting copy is
<em>not frozen</em>.

This function resets the tag field type of the copied
\link ctfirvarfieldtype CTF IR variant field types\endlink. The
automatic field resolving which some functions of the API perform
can set it again when the returned field type is used (learn more
in the detailed description of this module).

@param[in] field_type	Field type to copy.
@returns		Deep copy of \p field_type on success,
			or \c NULL on error.

@prenotnull{field_type}
@postrefcountsame{field_type}
@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_copy(
		struct bt_ctf_field_type *field_type);

/** @} */

/** @} */

/**
@defgroup ctfirintfieldtype CTF IR integer field type
@ingroup ctfirfieldtypes
@brief CTF IR integer field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>integer field type</em></strong> is a field type that
you can use to create concrete
\link ctfirintfield CTF IR integer fields\endlink.

You can create an integer field type
with bt_ctf_field_type_integer_create().

An integer field type has the following properties:

<table>
  <tr>
    <th>Property
    <th>Value at creation
    <th>Getter
    <th>Setter
  </tr>
  <tr>
    <td>\b Alignment (bits) of the described integer fields
    <td>1
    <td>bt_ctf_field_type_get_alignment()
    <td>bt_ctf_field_type_set_alignment()
  </tr>
  <tr>
    <td><strong>Byte order</strong> of the described integer fields
    <td>#BT_CTF_BYTE_ORDER_NATIVE
    <td>bt_ctf_field_type_get_byte_order()
    <td>bt_ctf_field_type_set_byte_order()
  </tr>
  <tr>
    <td><strong>Storage size</strong> (bits) of the described
        integer fields
    <td>Specified at creation
    <td>bt_ctf_field_type_integer_get_size()
    <td>None: specified at creation (bt_ctf_field_type_integer_create())
  </tr>
  <tr>
    <td><strong>Signedness</strong> of the described integer fields
    <td>Unsigned
    <td>bt_ctf_field_type_integer_get_signed()
    <td>bt_ctf_field_type_integer_set_signed()
  </tr>
  <tr>
    <td><strong>Preferred display base</strong> of the described
        integer fields
    <td>#BT_CTF_INTEGER_BASE_DECIMAL
    <td>bt_ctf_field_type_integer_get_base()
    <td>bt_ctf_field_type_integer_set_base()
  </tr>
  <tr>
    <td>\b Encoding of the described integer fields
    <td>#BT_CTF_STRING_ENCODING_NONE
    <td>bt_ctf_field_type_integer_get_encoding()
    <td>bt_ctf_field_type_integer_set_encoding()
  </tr>
  <tr>
    <td><strong>Mapped
        \link ctfirclockclass CTF IR clock class\endlink</strong>
    <td>None
    <td>bt_ctf_field_type_integer_get_mapped_clock()
    <td>bt_ctf_field_type_integer_set_mapped_clock()
  </tr>
</table>

@sa ctfirintfield
@sa ctfirfieldtypes

@addtogroup ctfirintfieldtype
@{
*/

/**
@brief	Preferred display base (radix) of a
	\link ctfirintfieldtype CTF IR integer field type\endlink.
*/
enum bt_ctf_integer_base {
	/// Unknown, used for errors.
	BT_CTF_INTEGER_BASE_UNKNOWN = -1,

	/// Binary.
	BT_CTF_INTEGER_BASE_BINARY = 2,

	/// Octal.
	BT_CTF_INTEGER_BASE_OCTAL = 8,

	/// Decimal.
	BT_CTF_INTEGER_BASE_DECIMAL = 10,

	/// Hexadecimal.
	BT_CTF_INTEGER_BASE_HEXADECIMAL = 16,
};

/**
@brief	Creates a default CTF IR integer field type with \p size bits
	as the storage size of the CTF IR integer fields it describes.

@param[in] size	Storage size (bits) of the described integer fields.
@returns	Created integer field type, or \c NULL on error.

@pre \p size is greater than 0 and lesser than or equal to 64.
@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_integer_create(
		unsigned int size);

/**
@brief	Returns the storage size, in bits, of the CTF IR integer fields
	described by the CTF IR integer field type \p int_field_type.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to get the
				storage size.
@returns			Storage size (bits) of the integer
				fields described by \p int_field_type,
				or a negative value on error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@postrefcountsame{int_field_type}
*/
extern int bt_ctf_field_type_integer_get_size(
		struct bt_ctf_field_type *int_field_type);

/**
@brief	Returns whether or not the CTF IR integer fields
	described by the CTF IR integer field type \p int_field_type
	are signed.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to get the
				signedness.
@returns			1 if the integer fields described by
				\p int_field_type are signed, 0 if they
				are unsigned, or a negative value on
				error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@postrefcountsame{int_field_type}

@sa bt_ctf_field_type_integer_set_signed(): Sets the signedness of the
	integer fields described by a given integer field type.
*/
extern int bt_ctf_field_type_integer_get_signed(
		struct bt_ctf_field_type *int_field_type);

/**
@brief	Sets whether or not the CTF IR integer fields described by
	the CTF IR integer field type \p int_field_type are signed.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to set the
				signedness.
@param[in] is_signed		Signedness of the integer fields
				described by \p int_field_type; 0 means
				\em unsigned, 1 means \em signed.
@returns			0 on success, or a negative value on error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@prehot{int_field_type}
@pre \p is_signed is 0 or 1.
@postrefcountsame{event_class}

@sa bt_ctf_field_type_integer_get_signed(): Returns the signedness of
	the integer fields described by a given integer field type.
*/
extern int bt_ctf_field_type_integer_set_signed(
		struct bt_ctf_field_type *int_field_type, int is_signed);

/**
@brief  Returns the preferred display base (radix) of the CTF IR integer
	fields described by the CTF IR integer field type
	\p int_field_type.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to get the
				preferred display base.
@returns			Preferred display base of the integer
				fields described by \p int_field_type,
				or #BT_CTF_INTEGER_BASE_UNKNOWN on
				error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@postrefcountsame{int_field_type}

@sa bt_ctf_field_type_integer_set_base(): Sets the preferred display
	base of the integer fields described by a given integer field
	type.
*/
extern enum bt_ctf_integer_base bt_ctf_field_type_integer_get_base(
		struct bt_ctf_field_type *int_field_type);

/**
@brief  Sets the preferred display base (radix) of the CTF IR integer
	fields described by the CTF IR integer field type
	\p int_field_type to \p base.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to set the
				preferred display base.
@param[in] base			Preferred display base of the integer
				fields described by \p int_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@prehot{int_field_type}
@pre \p base is #BT_CTF_INTEGER_BASE_BINARY, #BT_CTF_INTEGER_BASE_OCTAL,
	#BT_CTF_INTEGER_BASE_DECIMAL, or
	#BT_CTF_INTEGER_BASE_HEXADECIMAL.
@postrefcountsame{int_field_type}

@sa bt_ctf_field_type_integer_get_base(): Returns the preferred display
	base of the integer fields described by a given
	integer field type.
*/
extern int bt_ctf_field_type_integer_set_base(
		struct bt_ctf_field_type *int_field_type,
		enum bt_ctf_integer_base base);

/**
@brief  Returns the encoding of the CTF IR integer fields described by
	the CTF IR integer field type \p int_field_type.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to get the
				encoding.
@returns			Encoding of the integer
				fields described by \p int_field_type,
				or #BT_CTF_STRING_ENCODING_UNKNOWN on
				error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@postrefcountsame{int_field_type}

@sa bt_ctf_field_type_integer_set_encoding(): Sets the encoding
	of the integer fields described by a given integer field type.
*/
extern enum bt_ctf_string_encoding bt_ctf_field_type_integer_get_encoding(
		struct bt_ctf_field_type *int_field_type);

/**
@brief	Sets the encoding of the CTF IR integer fields
	described by the CTF IR integer field type \p int_field_type
	to \p encoding.

You can use this property, in CTF IR, to create "text" array or sequence
field types. A text array field type is an
\link ctfirarrayfieldtype array field type\endlink with an unsigned,
8-bit integer field type having an encoding as its element field type.

@param[in] int_field_type	Integer field type which describes the
				integer fields of which to set the
				encoding.
@param[in] encoding		Encoding of the integer
				fields described by \p int_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@prehot{int_field_type}
@pre \p encoding is #BT_CTF_STRING_ENCODING_NONE,
	#BT_CTF_STRING_ENCODING_ASCII, or
	#BT_CTF_STRING_ENCODING_UTF8.
@postrefcountsame{int_field_type}

@sa bt_ctf_field_type_integer_get_encoding(): Returns the encoding of
	the integer fields described by a given integer field type.
*/
extern int bt_ctf_field_type_integer_set_encoding(
		struct bt_ctf_field_type *int_field_type,
		enum bt_ctf_string_encoding encoding);

/**
@brief  Returns the CTF IR clock class mapped to the CTF IR integer
	field type \p int_field_type.

The mapped clock class, if any, indicates the class of the clock which
an integer field described by \p int_field_type should sample or update.
This mapped clock class is only indicative.

@param[in] int_field_type	Integer field type of which to get the
				mapped clock class.
@returns			Mapped clock class of \p int_field_type,
				or \c NULL if there's no mapped clock
				class or on error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@postrefcountsame{int_field_type}
@postsuccessrefcountretinc

@sa bt_ctf_field_type_integer_set_mapped_clock(): Sets the mapped
	clock class of a given integer field type.
*/
extern struct bt_ctf_clock *bt_ctf_field_type_integer_get_mapped_clock(
		struct bt_ctf_field_type *int_field_type);

/**
@brief	Sets the CTF IR clock class mapped to the CTF IR integer field
	type \p int_field_type to \p mapped_clock.

The mapped clock class, if any, indicates the class of the clock which
an integer field described by \p int_field_type should sample or update.
This mapped clock class is only indicative.

@param[in] int_field_type	Integer field type of which to set the
				mapped clock class.
@param[in] clock_class		Mapped clock class of \p int_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{int_field_type}
@prenotnull{clock_class}
@preisintft{int_field_type}
@prehot{int_field_type}
@postrefcountsame{int_field_type}
@postsuccessrefcountinc{clock_class}

@sa bt_ctf_field_type_integer_get_mapped_clock(): Returns the mapped
	clock class of a given integer field type.
*/
extern int bt_ctf_field_type_integer_set_mapped_clock(
		struct bt_ctf_field_type *int_field_type,
		struct bt_ctf_clock *clock_class);

/** @} */

/**
@defgroup ctfirfloatfieldtype CTF IR floating point number field type
@ingroup ctfirfieldtypes
@brief CTF IR floating point number field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>floating point number field type</em></strong> is
a field type that you can use to create concrete
\link ctfirfloatfield CTF IR floating point number fields\endlink.

You can create a floating point number field type
with bt_ctf_field_type_floating_point_create().

A floating point number field type has the following properties:

<table>
  <tr>
    <th>Property
    <th>Value at creation
    <th>Getter
    <th>Setter
  </tr>
  <tr>
    <td>\b Alignment (bits) of the described floating point
        number fields
    <td>1
    <td>bt_ctf_field_type_get_alignment()
    <td>bt_ctf_field_type_set_alignment()
  </tr>
  <tr>
    <td><strong>Byte order</strong> of the described floating point
        number fields
    <td>#BT_CTF_BYTE_ORDER_NATIVE
    <td>bt_ctf_field_type_get_byte_order()
    <td>bt_ctf_field_type_set_byte_order()
  </tr>
  <tr>
    <td><strong>Exponent storage size</strong> (bits) of the described
        floating point number fields
    <td>8
    <td>bt_ctf_field_type_floating_point_get_exponent_digits()
    <td>bt_ctf_field_type_floating_point_set_exponent_digits()
  </tr>
  <tr>
    <td><strong>Mantissa and sign storage size</strong> (bits) of the
        described floating point number fields
    <td>24 (23-bit mantissa, 1-bit sign)
    <td>bt_ctf_field_type_floating_point_get_mantissa_digits()
    <td>bt_ctf_field_type_floating_point_set_mantissa_digits()
  </tr>
</table>

@sa ctfirfloatfield
@sa ctfirfieldtypes

@addtogroup ctfirfloatfieldtype
@{
*/

/**
@brief	Creates a default CTF IR floating point number field type.

@returns	Created floating point number field type,
		or \c NULL on error.

@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_floating_point_create(void);

/**
@brief  Returns the exponent storage size of the CTF IR floating point
	number fields described by the CTF IR floating point number
	field type \p float_field_type.

@param[in] float_field_type	Floating point number field type which
				describes the floating point number
				fields of which to get the exponent
				storage size.
@returns			Exponent storage size of the
				floating point number fields
				described by \p float_field_type,
				or a negative value on error.

@prenotnull{float_field_type}
@preisfloatft{float_field_type}
@postrefcountsame{float_field_type}

@sa bt_ctf_field_type_floating_point_set_exponent_digits(): Sets the
	exponent storage size of the floating point number fields
	described by a given floating point number field type.
*/
extern int bt_ctf_field_type_floating_point_get_exponent_digits(
		struct bt_ctf_field_type *float_field_type);

/**
@brief	Sets the exponent storage size of the CTF IR floating point
	number fields described by the CTF IR floating point number
	field type \p float_field_type to \p exponent_size.

As of Babeltrace \btversion, \p exponent_size can only be 8 or 11.

@param[in] float_field_type	Floating point number field type which
				describes the floating point number
				fields of which to set the exponent
				storage size.
@param[in] exponent_size	Exponent storage size of the floating
				point number fields described by \p
				float_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{float_field_type}
@preisfloatft{float_field_type}
@prehot{float_field_type}
@pre \p exponent_size is 8 or 11.
@postrefcountsame{float_field_type}

@sa bt_ctf_field_type_floating_point_get_exponent_digits(): Returns the
	exponent storage size of the floating point number fields
	described by a given floating point number field type.
*/
extern int bt_ctf_field_type_floating_point_set_exponent_digits(
		struct bt_ctf_field_type *float_field_type,
		unsigned int exponent_size);

/**
@brief  Returns the mantissa and sign storage size of the CTF IR
	floating point number fields described by the CTF IR floating
	point number field type \p float_field_type.

On success, the returned value is the sum of the mantissa \em and
sign storage sizes.

@param[in] float_field_type	Floating point number field type which
				describes the floating point number
				fields of which to get the mantissa and
				sign storage size.
@returns			Mantissa and sign storage size of the
				floating point number fields
				described by \p float_field_type,
				or a negative value on error.

@prenotnull{float_field_type}
@preisfloatft{float_field_type}
@postrefcountsame{float_field_type}

@sa bt_ctf_field_type_floating_point_set_mantissa_digits(): Sets the
	mantissa and size storage size of the floating point number
	fields described by a given floating point number field type.
*/
extern int bt_ctf_field_type_floating_point_get_mantissa_digits(
		struct bt_ctf_field_type *float_field_type);

/**
@brief  Sets the mantissa and sign storage size of the CTF IR floating
	point number fields described by the CTF IR floating point
	number field type \p float_field_type to \p mantissa_sign_size.

As of Babeltrace \btversion, \p mantissa_sign_size can only be 24 or 53.

@param[in] float_field_type	Floating point number field type which
				describes the floating point number
				fields of which to set the mantissa and
				sign storage size.
@param[in] mantissa_sign_size	Mantissa and sign storage size of the
				floating point number fields described
				by \p float_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{float_field_type}
@preisfloatft{float_field_type}
@prehot{float_field_type}
@pre \p mantissa_sign_size is 24 or 53.
@postrefcountsame{float_field_type}

@sa bt_ctf_field_type_floating_point_get_mantissa_digits(): Returns the
	mantissa and sign storage size of the floating point number
	fields described by a given floating point number field type.
*/
extern int bt_ctf_field_type_floating_point_set_mantissa_digits(
		struct bt_ctf_field_type *float_field_type,
		unsigned int mantissa_sign_size);

/** @} */

/**
@defgroup ctfirenumfieldtype CTF IR enumeration field type
@ingroup ctfirfieldtypes
@brief CTF IR enumeration field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>enumeration field type</em></strong> is
a field type that you can use to create concrete
\link ctfirenumfield CTF IR enumeration fields\endlink.

You can create an enumeration field type
with bt_ctf_field_type_enumeration_create(). This function needs
a \link ctfirintfieldtype CTF IR integer field type\endlink which
represents the storage field type of the created enumeration field type.
In other words, an enumeration field type wraps an integer field type
and adds label-value mappings to it.

An enumeration mapping has:

- A <strong>name</strong>.
- A <strong>range of values</strong> given by a beginning and an ending
  value, both included in the range.

You can add a mapping to an enumeration field type with
bt_ctf_field_type_enumeration_add_mapping() or
bt_ctf_field_type_enumeration_add_mapping_unsigned(), depending on the
signedness of the wrapped integer field type.

Many mappings can share the same name, but the ranges of a given
enumeration field type <strong>must not overlap</strong>. For example,
this is a valid set of mappings:

@verbatim
APPLE  -> [  3, 19]
BANANA -> [-15,  1]
CHERRY -> [ 25, 34]
APPLE  -> [ 55, 55]
@endverbatim

The following set of mappings is \em not valid, however:

@verbatim
APPLE  -> [  3, 19]
BANANA -> [-15,  1]
CHERRY -> [ 25, 34]
APPLE  -> [ 30, 55]
@endverbatim

Here, the range of the second \c APPLE mapping overlaps the range of
the \c CHERRY mapping.

@sa ctfirenumfield
@sa ctfirfieldtypes

@addtogroup ctfirenumfieldtype
@{
*/

/**
@brief	Creates a default CTF IR enumeration field type wrapping the
	\link ctfirintfieldtype CTF IR integer field type\endlink
	\p int_field_type.

@param[in] int_field_type	Integer field type wrapped by the
				created enumeration field type.
@returns			Created enumeration field type,
				or \c NULL on error.

@prenotnull{int_field_type}
@preisintft{int_field_type}
@postsuccessrefcountinc{int_field_type}
@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_enumeration_create(
		struct bt_ctf_field_type *int_field_type);

/**
@brief	Returns the
	\link ctfirintfieldtype CTF IR integer field type\endlink
	wrapped by the CTF IR enumeration field type \p enum_field_type.

@param[in] enum_field_type	Enumeration field type of which to get
				the wrapped integer field type.
@returns			Integer field type wrapped by
				\p enum_field_type, or \c NULL on
				error.

@prenotnull{enum_field_type}
@preisenumft{enum_field_type}
@postrefcountsame{enum_field_type}
@postsuccessrefcountretinc
*/
extern
struct bt_ctf_field_type *bt_ctf_field_type_enumeration_get_container_type(
		struct bt_ctf_field_type *enum_field_type);

/**
@brief	Returns the number of mappings contained in the
	CTF IR enumeration field type \p enum_field_type.

@param[in] enum_field_type	Enumeration field type of which to get
				the number of contained mappings.
@returns			Number of mappings contained in
				\p enum_field_type, or a negative
				value on error.

@prenotnull{enum_field_type}
@preisenumft{enum_field_type}
@postrefcountsame{enum_field_type}
*/
extern int bt_ctf_field_type_enumeration_get_mapping_count(
		struct bt_ctf_field_type *enum_field_type);

/**
@brief	Returns the signed mapping of the CTF IR enumeration field type
	\p enum_field_type at index \p index.

The \link ctfirintfieldtype CTF IR integer field type\endlink wrapped by
\p enum_field_type, as returned by
bt_ctf_field_type_enumeration_get_container_type(), must be
\b signed to use this function.

On success, \p enum_field_type remains the sole owner of \p *name.

@param[in] enum_field_type	Enumeration field type of which to get
				the mapping at index \p index.
@param[in] index		Index of the mapping to get from
				\p enum_field_type.
@param[out] name		Returned name of the mapping at index
				\p index.
@param[out] range_begin		Returned beginning of the range
				(included) of the mapping at index \p
				index.
@param[out] range_end		Returned end of the range (included) of
				the mapping at index \p index.
@returns			0 on success, or a negative value on error.

@prenotnull{enum_field_type}
@prenotnull{name}
@prenotnull{range_begin}
@prenotnull{range_end}
@preisenumft{enum_field_type}
@pre The wrapped integer field type of \p enum_field_type is signed.
@pre \p index is lesser than the number of mappings contained in the
	enumeration field type \p enum_field_type (see
	bt_ctf_field_type_enumeration_get_mapping_count()).
@postrefcountsame{enum_field_type}

@sa bt_ctf_field_type_enumeration_get_mapping_unsigned(): Returns the
	unsigned mapping contained by a given enumeration field type
	at a given index.
*/
extern int bt_ctf_field_type_enumeration_get_mapping(
		struct bt_ctf_field_type *enum_field_type, int index,
		const char **name, int64_t *range_begin, int64_t *range_end);

/**
@brief  Returns the unsigned mapping of the CTF IR enumeration field
	type \p enum_field_type at index \p index.

The \link ctfirintfieldtype CTF IR integer field type\endlink wrapped by
\p enum_field_type, as returned by
bt_ctf_field_type_enumeration_get_container_type(), must be
\b unsigned to use this function.

On success, \p enum_field_type remains the sole owner of \p *name.

@param[in] enum_field_type	Enumeration field type of which to get
				the mapping at index \p index.
@param[in] index		Index of the mapping to get from
				\p enum_field_type.
@param[out] name		Returned name of the mapping at index
				\p index.
@param[out] range_begin		Returned beginning of the range
				(included) of the mapping at index \p
				index.
@param[out] range_end		Returned end of the range (included) of
				the mapping at index \p index.
@returns			0 on success, or a negative value on error.

@prenotnull{enum_field_type}
@prenotnull{name}
@prenotnull{range_begin}
@prenotnull{range_end}
@preisenumft{enum_field_type}
@pre The wrapped integer field type of \p enum_field_type is unsigned.
@pre \p index is lesser than the number of mappings contained in the
	enumeration field type \p enum_field_type (see
	bt_ctf_field_type_enumeration_get_mapping_count()).
@postrefcountsame{enum_field_type}

@sa bt_ctf_field_type_enumeration_get_mapping(): Returns the
	signed mapping contained by a given enumeration field type
	at a given index.
*/
extern int bt_ctf_field_type_enumeration_get_mapping_unsigned(
		struct bt_ctf_field_type *enum_field_type, int index,
		const char **name, uint64_t *range_begin,
		uint64_t *range_end);

/** @cond DOCUMENT */
/*
 * TODO: Document once we know what to do with this function (return
 *       the first match?).
 */
extern int bt_ctf_field_type_enumeration_get_mapping_index_by_name(
		struct bt_ctf_field_type *enum_field_type, const char *name);
/** @endcond */

/**
@brief  Returns the index of the signed mapping of the CTF IR
	enumeration field type \p field_type which contains the
	value \p value.

The \link ctfirintfieldtype CTF IR integer field type\endlink wrapped by
\p enum_field_type, as returned by
bt_ctf_field_type_enumeration_get_container_type(), must be
\b signed to use this function.

@param[in] enum_field_type	Enumeration field type of which to get
				the index of the mapping which contains
				\p value.
@param[in] value		Value of the mapping to find.
@returns			Index of the mapping of
				\p enum_field_type which contains
				\p value, or a negative value if the
				function cannot find such a mapping or
				on error.

@prenotnull{enum_field_type}
@preisenumft{enum_field_type}
@pre The wrapped integer field type of \p enum_field_type is signed.
@postrefcountsame{enum_field_type}

@sa bt_ctf_field_type_enumeration_get_mapping_index_by_unsigned_value():
	Finds the index of an unsigned mapping of a given enumeration
	field type by value.
*/
extern int bt_ctf_field_type_enumeration_get_mapping_index_by_value(
		struct bt_ctf_field_type *enum_field_type, int64_t value);

/**
@brief  Returns the index of the unsigned mapping of the CTF IR
	enumeration field type \p field_type which contains the
	value \p value.

The \link ctfirintfieldtype CTF IR integer field type\endlink wrapped by
\p enum_field_type, as returned by
bt_ctf_field_type_enumeration_get_container_type(), must be
\b unsigned to use this function.

@param[in] enum_field_type	Enumeration field type of which to get
				the index of the mapping which contains
				\p value.
@param[in] value		Value of the mapping to find.
@returns			Index of the mapping of
				\p enum_field_type which contains
				\p value, or a negative value if the
				function cannot find such a mapping or
				on error.

@prenotnull{enum_field_type}
@preisenumft{enum_field_type}
@pre The wrapped integer field type of \p enum_field_type is unsigned.
@postrefcountsame{enum_field_type}

@sa bt_ctf_field_type_enumeration_get_mapping_index_by_unsigned_value():
	Finds the index of a signed mapping of a given enumeration
	field type by value.
*/
extern int bt_ctf_field_type_enumeration_get_mapping_index_by_unsigned_value(
		struct bt_ctf_field_type *enum_field_type, uint64_t value);

/**
@brief	Adds a mapping to the CTF IR enumeration field type
	\p enum_field_type which maps the name \p name to the signed
	range \p range_begin (included) to \p range_end (included).

Make \p range_begin and \p range_end the same value to add a mapping
to a single value.

The \link ctfirintfieldtype CTF IR integer field type\endlink wrapped by
\p enum_field_type, as returned by
bt_ctf_field_type_enumeration_get_container_type(), must be
\b signed to use this function.

A mapping in \p enum_field_type can exist with the name \p name, but
there must be no overlap amongst all the ranges of
\p enum_field_type.

@param[in] enum_field_type	Enumeration field type to which to add
				a mapping.
@param[in] name			Name of the mapping to add (copied
				on success).
@param[in] range_begin		Beginning of the range of the mapping
				(included).
@param[in] range_end		End of the range of the mapping
				(included).
@returns			0 on success, or a negative value on error.

@prenotnull{enum_field_type}
@prenotnull{name}
@preisenumft{enum_field_type}
@pre The wrapped integer field type of \p enum_field_type is signed.
@pre \p range_end is greater than or equal to \p range_begin.
@postrefcountsame{enum_field_type}

@sa bt_ctf_field_type_enumeration_add_mapping_unsigned(): Adds an
	unsigned mapping to a given enumeration field type.
*/
extern int bt_ctf_field_type_enumeration_add_mapping(
		struct bt_ctf_field_type *enum_field_type, const char *name,
		int64_t range_begin, int64_t range_end);

/**
@brief	Adds a mapping to the CTF IR enumeration field type
	\p enum_field_type which maps the name \p name to the unsigned
	range \p range_begin (included) to \p range_end (included).

Make \p range_begin and \p range_end the same value to add a mapping
to a single value.

The \link ctfirintfieldtype CTF IR integer field type\endlink wrapped by
\p enum_field_type, as returned by
bt_ctf_field_type_enumeration_get_container_type(), must be
\b unsigned to use this function.

A mapping in \p enum_field_type can exist with the name \p name, but
there must be no overlap amongst all the ranges of
\p enum_field_type.

@param[in] enum_field_type	Enumeration field type to which to add
				a mapping.
@param[in] name			Name of the mapping to add (copied
				on success).
@param[in] range_begin		Beginning of the range of the mapping
				(included).
@param[in] range_end		End of the range of the mapping
				(included).
@returns			0 on success, or a negative value on error.

@prenotnull{enum_field_type}
@prenotnull{name}
@preisenumft{enum_field_type}
@pre The wrapped integer field type of \p enum_field_type is unsigned.
@pre \p range_end is greater than or equal to \p range_begin.
@postrefcountsame{enum_field_type}

@sa bt_ctf_field_type_enumeration_add_mapping(): Adds a signed
	mapping to a given enumeration field type.
*/
extern int bt_ctf_field_type_enumeration_add_mapping_unsigned(
		struct bt_ctf_field_type *enum_field_type, const char *name,
		uint64_t range_begin, uint64_t range_end);

/** @} */

/**
@defgroup ctfirstringfieldtype CTF IR string field type
@ingroup ctfirfieldtypes
@brief CTF IR string field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>string field type</em></strong> is a field type that
you can use to create concrete
\link ctfirstringfield CTF IR string fields\endlink.

You can create a string field type
with bt_ctf_field_type_string_create().

A string field type has only one property: the \b encoding of its
described string fields. By default, the encoding of the string fields
described by a string field type is #BT_CTF_STRING_ENCODING_UTF8. You
can set the encoding of the string fields described by a string field
type with bt_ctf_field_type_string_set_encoding().

@sa ctfirstringfield
@sa ctfirfieldtypes

@addtogroup ctfirstringfieldtype
@{
*/

/**
@brief	Creates a default CTF IR string field type.

@returns	Created string field type, or \c NULL on error.

@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_string_create(void);

/**
@brief  Returns the encoding of the CTF IR string fields described by
	the CTF IR string field type \p string_field_type.

@param[in] string_field_type	String field type which describes the
				string fields of which to get the
				encoding.
@returns			Encoding of the string
				fields described by \p string_field_type,
				or #BT_CTF_STRING_ENCODING_UNKNOWN on
				error.

@prenotnull{string_field_type}
@preisstringft{string_field_type}
@postrefcountsame{string_field_type}

@sa bt_ctf_field_type_string_set_encoding(): Sets the encoding
	of the string fields described by a given string field type.
*/
extern enum bt_ctf_string_encoding bt_ctf_field_type_string_get_encoding(
		struct bt_ctf_field_type *string_field_type);

/**
@brief	Sets the encoding of the CTF IR string fields
	described by the CTF IR string field type \p string_field_type
	to \p encoding.

@param[in] string_field_type	String field type which describes the
				string fields of which to set the
				encoding.
@param[in] encoding		Encoding of the string fields described
				by \p string_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{string_field_type}
@preisstringft{string_field_type}
@prehot{string_field_type}
@pre \p encoding is #BT_CTF_STRING_ENCODING_ASCII or
	#BT_CTF_STRING_ENCODING_UTF8.
@postrefcountsame{string_field_type}

@sa bt_ctf_field_type_string_get_encoding(): Returns the encoding of
	the string fields described by a given string field type.
*/
extern int bt_ctf_field_type_string_set_encoding(
		struct bt_ctf_field_type *string_field_type,
		enum bt_ctf_string_encoding encoding);

/** @} */

/**
@defgroup ctfirstructfieldtype CTF IR structure field type
@ingroup ctfirfieldtypes
@brief CTF IR structure field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>structure field type</em></strong> is
a field type that you can use to create concrete
\link ctfirstructfield CTF IR structure fields\endlink.

You can create a structure field type
with bt_ctf_field_type_structure_create(). This function creates
an empty structure field type, with no fields.

You can add a field to a structure field type with
bt_ctf_field_type_structure_add_field(). Two fields in a structure
field type cannot have the same name.

You can set the \em minimum alignment of the structure fields described
by a structure field type with the common
bt_ctf_field_type_set_alignment() function. The \em effective alignment
of the structure fields described by a structure field type, as per
<a href="http://diamon.org/ctf/">CTF</a>, is the \em maximum value amongst
the effective alignments of all its fields. Note that the effective
alignment of CTF IR variant fields is always 1.

You can set the byte order of <em>all the contained fields</em>,
recursively, of a structure field type with the common
bt_ctf_field_type_set_byte_order() function.

@sa ctfirstructfield
@sa ctfirfieldtypes

@addtogroup ctfirstructfieldtype
@{
*/

/**
@brief	Creates a default, empty CTF IR structure field type.

@returns			Created structure field type,
				or \c NULL on error.

@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_structure_create(void);

/**
@brief	Returns the number of fields contained in the CTF IR
	structure field type \p struct_field_type.

@param[in] struct_field_type	Structure field type of which to get
				the number of contained fields.
@returns			Number of fields contained in
				\p struct_field_type, or a negative
				value on error.

@prenotnull{struct_field_type}
@preisstructft{struct_field_type}
@postrefcountsame{struct_field_type}
*/
extern int bt_ctf_field_type_structure_get_field_count(
		struct bt_ctf_field_type *struct_field_type);

/**
@brief	Returns the field of the CTF IR structure field type
	\p struct_field_type at index \p index.

On success, the field's type is placed in \p *field_type if
\p field_type is not \c NULL. The field's name is placed in
\p *field_name if \p field_name is not \c NULL.
\p struct_field_type remains the sole owner of \p *field_name.

@param[in] struct_field_type	Structure field type of which to get
				the field at index \p index.
@param[out] field_name		Returned name of the field at index
				\p index (can be \c NULL).
@param[out] field_type		Returned field type of the field
				at index \p index (can be \c NULL).
@param[in] index		Index of the field to get from
				\p struct_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{struct_field_type}
@preisstructft{struct_field_type}
@pre \p index is lesser than the number of fields contained in the
	structure field type \p struct_field_type (see
	bt_ctf_field_type_structure_get_field_count()).
@postrefcountsame{struct_field_type}
@post <strong>On success</strong>, the returned field's type is placed
	in \p *field_type and its reference count is incremented.

@sa bt_ctf_field_type_structure_get_field_type_by_name(): Finds a
	structure field type's field by name.
*/
extern int bt_ctf_field_type_structure_get_field(
		struct bt_ctf_field_type *struct_field_type,
		const char **field_name, struct bt_ctf_field_type **field_type,
		int index);

/**
@brief  Returns the type of the field named \p field_name found in
	the CTF IR structure field type \p struct_field_type.

@param[in] struct_field_type	Structure field type of which to get
				a field's type.
@param[in] field_name		Name of the field to find.
@returns			Type of the field named \p field_name in
				\p struct_field_type, or
				\c NULL on error.

@prenotnull{struct_field_type}
@prenotnull{field_name}
@preisstructft{struct_field_type}
@postrefcountsame{struct_field_type}
@postsuccessrefcountretinc

@sa bt_ctf_field_type_structure_get_field(): Finds a
	structure field type's field by index.
*/
extern
struct bt_ctf_field_type *bt_ctf_field_type_structure_get_field_type_by_name(
		struct bt_ctf_field_type *struct_field_type,
		const char *field_name);

/**
@brief	Adds a field named \p field_name with the CTF IR field type
	\p field_type to the CTF IR structure field type
	\p struct_field_type.

On success, \p field_type becomes the child of \p struct_field_type.

This function adds the new field after the current last field of
\p struct_field_type (append mode).

You \em cannot add a field named \p field_name if there's already a
field named \p field_name in \p struct_field_type.

@param[in] struct_field_type	Structure field type to which to add
				a new field.
@param[in] field_type		Field type of the field to add to
				\p struct_field_type.
@param[in] field_name		Name of the field to add to
				\p struct_field_type
				(copied on success).
@returns			0 on success, or a negative value on error.

@prenotnull{struct_field_type}
@prenotnull{field_type}
@prenotnull{field_name}
@preisstructft{struct_field_type}
@pre \p field_type is not and does not contain \p struct_field_type,
	recursively, as a field's type.
@prehot{struct_field_type}
@postrefcountsame{struct_field_type}
@postsuccessrefcountinc{field_type}
*/
extern int bt_ctf_field_type_structure_add_field(
		struct bt_ctf_field_type *struct_field_type,
		struct bt_ctf_field_type *field_type,
		const char *field_name);

/** @} */

/**
@defgroup ctfirarrayfieldtype CTF IR array field type
@ingroup ctfirfieldtypes
@brief CTF IR array field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>array field type</em></strong> is a field type that
you can use to create concrete
\link ctfirarrayfield CTF IR array fields\endlink.

You can create an array field type
with bt_ctf_field_type_array_create(). This function needs
the field type of the fields contained by the array fields
described by the array field type to create.

@sa ctfirarrayfield
@sa ctfirfieldtypes

@addtogroup ctfirarrayfieldtype
@{
*/

/**
@brief	Creates a default CTF IR array field type with
	\p element_field_type as the field type of the fields contained
	in its described array fields of length \p length.

@param[in] element_field_type	Field type of the fields contained in
				the array fields described by the
				created array field type.
@param[in] length		Length of the array fields described by
				the created array field type.
@returns			Created array field type, or
				\c NULL on error.

@prenotnull{element_field_type}
@postsuccessrefcountinc{element_field_type}
@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_array_create(
		struct bt_ctf_field_type *element_field_type,
		unsigned int length);

/**
@brief	Returns the CTF IR field type of the CTF IR fields contained in
	the CTF IR array fields described by the CTF IR array field type
	\p array_field_type.

@param[in] array_field_type	Array field type of which to get
				the type of the fields contained in its
				described array fields.
@returns			Type of the fields contained in the
				array fields described by
				\p array_field_type, or \c NULL
				on error.

@prenotnull{array_field_type}
@preisarrayft{array_field_type}
@postrefcountsame{array_field_type}
@postsuccessrefcountretinc
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_array_get_element_type(
		struct bt_ctf_field_type *array_field_type);

/**
@brief	Returns the number of CTF IR fields contained in the
	CTF IR array fields described by the CTF IR array field type
	\p array_field_type.

@param[in] array_field_type	Array field type of which to get
				the number of fields contained in its
				described array fields.
@returns			Number of fields contained in the
				array fields described by
				\p array_field_type, or a negative value
				on error.

@prenotnull{array_field_type}
@preisarrayft{array_field_type}
@postrefcountsame{array_field_type}
*/
extern int64_t bt_ctf_field_type_array_get_length(
		struct bt_ctf_field_type *array_field_type);

/** @} */

/**
@defgroup ctfirseqfieldtype CTF IR sequence field type
@ingroup ctfirfieldtypes
@brief CTF IR sequence field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>sequence field type</em></strong> is
a field type that you can use to create concrete
\link ctfirseqfield CTF IR sequence fields\endlink.

You can create a sequence field type with
bt_ctf_field_type_sequence_create(). This function needs the field type
of the fields contained by the sequence fields described by the created
sequence field type. This function also needs the length name of the
sequence field type to create. The length name is used to automatically
resolve the length's field type. See \ref ctfirfieldtypes to learn more
about the automatic resolving.

@sa ctfirseqfield
@sa ctfirfieldtypes

@addtogroup ctfirseqfieldtype
@{
*/

/**
@brief	Creates a default CTF IR sequence field type with
	\p element_field_type as the field type of the fields contained
	in its described sequence fields with the length name
	\p length_name.

\p length_name can be an absolute or relative reference. See
<a href="http://diamon.org/ctf/">CTF</a> for more details.

@param[in] element_field_type	Field type of the fields contained in
				the sequence fields described by the
				created sequence field type.
@param[in] length_name		Length name (copied on success).
@returns			Created array field type, or
				\c NULL on error.

@prenotnull{element_field_type}
@prenotnull{length_name}
@postsuccessrefcountinc{element_field_type}
@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_sequence_create(
		struct bt_ctf_field_type *element_field_type,
		const char *length_name);

/**
@brief	Returns the CTF IR field type of the CTF IR fields contained in
	the CTF IR sequence fields described by the CTF IR sequence
	field type \p sequence_field_type.

@param[in] sequence_field_type	Sequence field type of which to get
				the type of the fields contained in its
				described sequence fields.
@returns			Type of the fields contained in the
				sequence fields described by
				\p sequence_field_type, or \c NULL
				on error.

@prenotnull{sequence_field_type}
@preisseqft{sequence_field_type}
@postrefcountsame{sequence_field_type}
@postsuccessrefcountretinc
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_sequence_get_element_type(
		struct bt_ctf_field_type *sequence_field_type);

/**
@brief  Returns the length name of the CTF IR sequence
	field type \p sequence_field_type.

On success, \p sequence_field_type remains the sole owner of
the returned string.

@param[in] sequence_field_type	Sequence field type of which to get the
				length name.
@returns			Length name of \p sequence_field_type,
				or \c NULL on error.

@prenotnull{sequence_field_type}
@preisseqft{sequence_field_type}

@sa bt_ctf_field_type_sequence_get_length_field_path(): Returns the
	length's CTF IR field path of a given sequence field type.
*/
extern const char *bt_ctf_field_type_sequence_get_length_field_name(
		struct bt_ctf_field_type *sequence_field_type);

/**
@brief  Returns the length's CTF IR field path of the CTF IR sequence
	field type \p sequence_field_type.

The length's field path of a sequence field type is set when automatic
resolving is performed (see \ref ctfirfieldtypes).

@param[in] sequence_field_type	Sequence field type of which to get the
				length's field path.
@returns			Length's field path of
				\p sequence_field_type, or
				\c NULL if the length's field path is
				not set yet is not set or on error.

@prenotnull{sequence_field_type}
@preisseqft{sequence_field_type}
@postsuccessrefcountretinc

@sa bt_ctf_field_type_sequence_get_length_field_name(): Returns the
	length's name of a given sequence field type.
*/
extern struct bt_ctf_field_path *bt_ctf_field_type_sequence_get_length_field_path(
		struct bt_ctf_field_type *sequence_field_type);

/** @} */

/**
@defgroup ctfirvarfieldtype CTF IR variant field type
@ingroup ctfirfieldtypes
@brief CTF IR variant field type.

@code
#include <babeltrace/ctf-ir/field-types.h>
@endcode

A CTF IR <strong><em>variant field type</em></strong> is
a field type that you can use to create concrete
\link ctfirvarfield CTF IR variant fields\endlink.

You can create a variant field type
with bt_ctf_field_type_variant_create(). This function expects you to
pass both the tag's
\link ctfirenumfieldtype CTF IR enumeration field type\endlink and
the tag name of the variant field type to create. The tag's field type
is optional, as the Babeltrace system can automatically resolve it using
the tag name. You can leave the tag name to \c NULL initially, and set
it later with bt_ctf_field_type_variant_set_tag_name(). The tag name
must be set when the variant field type is frozen. See \ref
ctfirfieldtypes to learn more about the automatic resolving and the
conditions under which a field type can be frozen.

You can add a field to a variant field type with
bt_ctf_field_type_variant_add_field(). All the field names of a
variant field type \em must exist as mapping names in its tag's
enumeration field type.

The effective alignment of the CTF IR variant fields described by a
variant field type is always 1, but the individual fields of a
CTF IR variant field can have custom alignments.

You can set the byte order of <em>all the contained fields</em>,
recursively, of a variant field type with the common
bt_ctf_field_type_set_byte_order() function.

@sa ctfirvarfield
@sa ctfirfieldtypes

@addtogroup ctfirvarfieldtype
@{
*/

/**
@brief  Creates a default, empty CTF IR variant field type with the
	tag's \link ctfirenumfieldtype CTF IR enumeration field type\endlink
	\p tag_field_type and the tag name \p tag_name.

\p tag_field_type can be \c NULL; the tag's field type can be
automatically resolved from the variant field type's tag name (see
\ref ctfirfieldtypes). If \p tag_name is \c NULL, it \em must be set
with bt_ctf_field_type_variant_set_tag_name() \em before the variant
field type is frozen.

\p tag_name can be an absolute or relative reference. See
<a href="http://diamon.org/ctf/">CTF</a> for more details.

@param[in] tag_field_type	Tag's enumeration field type
				(can be \c NULL).
@param[in] tag_name		Tag name (copied on success,
				can be \c NULL).
@returns			Created variant field type, or
				\c NULL on error.

@pre \p tag_field_type is an enumeration field type or \c NULL.
@post <strong>On success, if \p tag_field_type is not \c NULL</strong>,
	its reference count is incremented.
@postsuccessrefcountret1
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_variant_create(
		struct bt_ctf_field_type *tag_field_type,
		const char *tag_name);

/**
@brief	Returns the tag's
	\link ctfirenumfieldtype CTF IR enumeration field type\endlink
	of the CTF IR variant field type \p variant_field_type.

@param[in] variant_field_type	Variant field type of which to get
				the tag's enumeration field type.
@returns			Tag's enumeration field type of
				\p variant_field_type, or \c NULL if the
				tag's field type is not set or on
				error.

@prenotnull{variant_field_type}
@preisvarft{variant_field_type}
@postrefcountsame{variant_field_type}
@postsuccessrefcountretinc
*/
extern struct bt_ctf_field_type *bt_ctf_field_type_variant_get_tag_type(
		struct bt_ctf_field_type *variant_field_type);

/**
@brief  Returns the tag name of the CTF IR variant
	field type \p variant_field_type.

On success, \p variant_field_type remains the sole owner of
the returned string.

@param[in] variant_field_type	Variant field type of which to get the
				tag name.
@returns			Tag name of \p variant_field_type, or
				\c NULL if the tag name is not set or
				on error.

@prenotnull{variant_field_type}
@preisvarft{variant_field_type}

@sa bt_ctf_field_type_variant_set_tag_name(): Sets the tag name of
	a given variant field type.
@sa bt_ctf_field_type_variant_get_tag_field_path(): Returns the tag's
	CTF IR field path of a given variant field type.
*/
extern const char *bt_ctf_field_type_variant_get_tag_name(
		struct bt_ctf_field_type *variant_field_type);

/**
@brief	Sets the tag name of the CTF IR variant field type
	\p variant_field_type.

\p tag_name can be an absolute or relative reference. See
<a href="http://diamon.org/ctf/">CTF</a> for more details.

@param[in] variant_field_type	Variant field type of which to set
				the tag name.
@param[in] tag_name		Tag name of \p variant_field_type
				(copied on success).
@returns			0 on success, or a negative value on error.

@prenotnull{variant_field_type}
@prenotnull{name}
@prehot{variant_field_type}
@postrefcountsame{variant_field_type}

@sa bt_ctf_field_type_variant_get_tag_name(): Returns the tag name of
	a given variant field type.
*/
extern int bt_ctf_field_type_variant_set_tag_name(
		struct bt_ctf_field_type *variant_field_type,
		const char *tag_name);

/**
@brief  Returns the tag's CTF IR field path of the CTF IR variant
	field type \p variant_field_type.

The tag's field path of a variant field type is set when automatic
resolving is performed (see \ref ctfirfieldtypes).

@param[in] variant_field_type	Variant field type of which to get the
				tag's field path.
@returns			Tag's field path of
				\p variant_field_type, or
				\c NULL if the tag's field path is not
				set yet is not set or on error.

@prenotnull{variant_field_type}
@preisvarft{variant_field_type}
@postsuccessrefcountretinc

@sa bt_ctf_field_type_variant_get_tag_name(): Returns the tag's
	name of a given variant field type.
*/
extern struct bt_ctf_field_path *bt_ctf_field_type_variant_get_tag_field_path(
		struct bt_ctf_field_type *variant_field_type);

/**
@brief	Returns the number of fields contained in the CTF IR
	variant field type \p variant_field_type.

@param[in] variant_field_type	Variant field type of which to get
				the number of contained fields.
@returns			Number of fields contained in
				\p variant_field_type, or a negative
				value on error.

@prenotnull{variant_field_type}
@preisvarft{variant_field_type}
@postrefcountsame{variant_field_type}
*/
extern int bt_ctf_field_type_variant_get_field_count(
		struct bt_ctf_field_type *variant_field_type);

/**
@brief	Returns the field (choice) of the CTF IR variant field type
	\p variant_field_type at index \p index.

On success, the field's type is placed in \p *field_type if
\p field_type is not \c NULL. The field's name is placed in
\p *field_name if \p field_name is not \c NULL.
\p variant_field_type remains the sole owner of \p *field_name.

@param[in] variant_field_type	Variant field type of which to get
				the field at index \p index.
@param[out] field_name		Returned name of the field at index
				\p index (can be \c NULL).
@param[out] field_type		Returned field type of the field
				at index \p index (can be \c NULL).
@param[in] index		Index of the field to get from
				\p variant_field_type.
@returns			0 on success, or a negative value on error.

@prenotnull{variant_field_type}
@preisvarft{variant_field_type}
@pre \p index is lesser than the number of fields contained in the
	variant field type \p variant_field_type (see
	bt_ctf_field_type_variant_get_field_count()).
@postrefcountsame{variant_field_type}
@post <strong>On success</strong>, the returned field's type is placed
	in \p *field_type and its reference count is incremented.

@sa bt_ctf_field_type_variant_get_field_type_by_name(): Finds a variant
	field type's field by name.
@sa bt_ctf_field_type_variant_get_field_type_from_tag(): Finds a variant
	field type's field by current tag value.
*/
extern int bt_ctf_field_type_variant_get_field(
		struct bt_ctf_field_type *variant_field_type,
		const char **field_name,
		struct bt_ctf_field_type **field_type, int index);

/**
@brief  Returns the type of the field (choice) named \p field_name
	found in the CTF IR variant field type \p variant_field_type.

@param[in] variant_field_type	Variant field type of which to get
				a field's type.
@param[in] field_name		Name of the field to find.
@returns			Type of the field named \p field_name in
				\p variant_field_type, or
				\c NULL on error.

@prenotnull{variant_field_type}
@prenotnull{field_name}
@preisvarft{variant_field_type}
@postrefcountsame{variant_field_type}
@postsuccessrefcountretinc

@sa bt_ctf_field_type_variant_get_field(): Finds a variant field type's
	field by index.
@sa bt_ctf_field_type_variant_get_field_type_from_tag(): Finds a variant
	field type's field by current tag value.
*/
extern
struct bt_ctf_field_type *bt_ctf_field_type_variant_get_field_type_by_name(
		struct bt_ctf_field_type *variant_field_type,
		const char *field_name);

/**
@brief  Returns the type of the field (choice) selected by the value of
	the \link ctfirenumfield CTF IR enumeration field\endlink
	\p tag_field in the CTF IR variant field type
	\p variant_field_type.

\p tag_field is the current tag value.

The field type of \p tag_field, as returned by bt_ctf_field_get_type(),
\em must be equivalent to the field type returned by
bt_ctf_field_type_variant_get_tag_type() for \p variant_field_type.

@param[in] variant_field_type	Variant field type of which to get
				a field's type.
@param[in] tag_field		Current tag value (variant field type's
				selector).
@returns			Type of the field selected by
				\p tag_field in \p variant_field_type,
				or \c NULL on error.

@prenotnull{variant_field_type}
@prenotnull{tag_field}
@preisvarft{variant_field_type}
@preisenumfield{tag_field}
@postrefcountsame{variant_field_type}
@postrefcountsame{tag_field}
@postsuccessrefcountretinc

@sa bt_ctf_field_type_variant_get_field(): Finds a variant field type's
	field by index.
@sa bt_ctf_field_type_variant_get_field_type_by_name(): Finds a variant
	field type's field by name.
*/
extern
struct bt_ctf_field_type *bt_ctf_field_type_variant_get_field_type_from_tag(
		struct bt_ctf_field_type *variant_field_type,
		struct bt_ctf_field *tag_field);

/**
@brief	Adds a field (a choice) named \p field_name with the CTF IR
	field type \p field_type to the CTF IR variant field type
	\p variant_field_type.

On success, \p field_type becomes the child of \p variant_field_type.

You \em cannot add a field named \p field_name if there's already a
field named \p field_name in \p variant_field_type.

\p field_name \em must name an existing mapping in the tag's
enumeration field type of \p variant_field_type.

@param[in] variant_field_type	Variant field type to which to add
				a new field.
@param[in] field_type		Field type of the field to add to
				\p variant_field_type.
@param[in] field_name		Name of the field to add to
				\p variant_field_type
				(copied on success).
@returns			0 on success, or a negative value on error.

@prenotnull{variant_field_type}
@prenotnull{field_type}
@prenotnull{field_name}
@preisvarft{variant_field_type}
@pre \p field_type is not and does not contain \p variant_field_type,
	recursively, as a field's type.
@prehot{variant_field_type}
@postrefcountsame{variant_field_type}
@postsuccessrefcountinc{field_type}
*/
extern int bt_ctf_field_type_variant_add_field(
		struct bt_ctf_field_type *variant_field_type,
		struct bt_ctf_field_type *field_type,
		const char *field_name);

/** @} */

#ifdef __cplusplus
}
#endif

#endif /* BABELTRACE_CTF_IR_FIELD_TYPES_H */