[babeltrace.git] / lib / ctf-ir / packet.c

/*
 * packet.c
 *
 * Babeltrace CTF IR - Stream packet
 *
 * Copyright 2016 Philippe Proulx <pproulx@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.
 */

#define BT_LOG_TAG "PACKET"
#include <babeltrace/lib-logging-internal.h>

#include <babeltrace/assert-pre-internal.h>
#include <babeltrace/ctf-ir/fields-internal.h>
#include <babeltrace/ctf-ir/packet.h>
#include <babeltrace/ctf-ir/packet-internal.h>
#include <babeltrace/ctf-ir/field-wrapper-internal.h>
#include <babeltrace/ctf-ir/trace.h>
#include <babeltrace/ctf-ir/stream-class-internal.h>
#include <babeltrace/ctf-ir/stream-class.h>
#include <babeltrace/ctf-ir/stream.h>
#include <babeltrace/ctf-ir/stream-internal.h>
#include <babeltrace/ctf-ir/trace-internal.h>
#include <babeltrace/object-internal.h>
#include <babeltrace/ref.h>
#include <babeltrace/assert-internal.h>
#include <inttypes.h>

struct bt_stream *bt_packet_borrow_stream(struct bt_packet *packet)
{
	BT_ASSERT_PRE_NON_NULL(packet, "Packet");
	return packet->stream;
}

struct bt_field *bt_packet_borrow_header(struct bt_packet *packet)
{
	BT_ASSERT_PRE_NON_NULL(packet, "Packet");
	return packet->header ? (void *) packet->header->field : NULL;
}

struct bt_field *bt_packet_borrow_context(struct bt_packet *packet)
{
	BT_ASSERT_PRE_NON_NULL(packet, "Packet");
	return packet->context ? (void *) packet->context->field : NULL;
}

BT_HIDDEN
void _bt_packet_set_is_frozen(struct bt_packet *packet, bool is_frozen)
{
	if (!packet || packet->frozen) {
		return;
	}

	BT_LOGD("Freezing packet: addr=%p", packet);

	if (packet->header) {
		BT_LOGD_STR("Freezing packet's header field.");
		bt_field_set_is_frozen_recursive((void *) packet->header->field,
			is_frozen);
	}

	if (packet->context) {
		BT_LOGD_STR("Freezing packet's context field.");
		bt_field_set_is_frozen_recursive((void *) packet->context->field,
			is_frozen);
	}

	packet->frozen = is_frozen;
}

static inline
void bt_packet_reset(struct bt_packet *packet)
{
	BT_ASSERT(packet);
	bt_packet_set_is_frozen(packet, false);

	if (packet->header) {
		bt_field_set_is_frozen_recursive(
			(void *) packet->header->field, false);
		bt_field_reset_recursive((void *) packet->header->field);
	}

	if (packet->context) {
		bt_field_set_is_frozen_recursive(
			(void *) packet->context->field, false);
		bt_field_reset_recursive((void *) packet->context->field);
	}
}

static
void bt_packet_header_field_recycle(struct bt_field_wrapper *header_field,
		struct bt_trace *trace)
{
	BT_ASSERT(header_field);
	BT_LIB_LOGD("Recycling packet header field: "
		"addr=%p, %![trace-]+t, %![field-]+f", header_field,
		trace, header_field->field);
	bt_object_pool_recycle_object(&trace->packet_header_field_pool,
		header_field);
}

static
void bt_packet_context_field_recycle(struct bt_field_wrapper *context_field,
		struct bt_stream_class *stream_class)
{
	BT_ASSERT(context_field);
	BT_LIB_LOGD("Recycling packet context field: "
		"addr=%p, %![sc-]+S, %![field-]+f", context_field,
		stream_class, context_field->field);
	bt_object_pool_recycle_object(&stream_class->packet_context_field_pool,
		context_field);
}

BT_HIDDEN
void bt_packet_recycle(struct bt_packet *packet)
{
	struct bt_stream *stream;

	BT_ASSERT(packet);
	BT_LIB_LOGD("Recycling packet: %!+a", packet);

	/*
	 * Those are the important ordered steps:
	 *
	 * 1. Reset the packet object (put any permanent reference it
	 *    has, unfreeze it and its fields in developer mode, etc.),
	 *    but do NOT put its stream's reference. This stream
	 *    contains the pool to which we're about to recycle this
	 *    packet object, so we must guarantee its existence thanks
	 *    to this existing reference.
	 *
	 * 2. Move the stream reference to our `stream`
	 *    variable so that we can set the packet's stream member
	 *    to NULL before recycling it. We CANNOT do this after
	 *    we put the stream reference because this bt_put()
	 *    could destroy the stream, also destroying its
	 *    packet pool, thus also destroying our packet object (this
	 *    would result in an invalid write access).
	 *
	 * 3. Recycle the packet object.
	 *
	 * 4. Put our stream reference.
	 */
	bt_packet_reset(packet);
	stream = packet->stream;
	BT_ASSERT(stream);
	packet->stream = NULL;
	bt_object_pool_recycle_object(&stream->packet_pool, packet);
	bt_object_put_no_null_check(&stream->common.base);
}

BT_HIDDEN
void bt_packet_destroy(struct bt_packet *packet)
{
	BT_LOGD("Destroying packet: addr=%p", packet);
	BT_LOGD_STR("Destroying packet's header field.");

	if (packet->header) {
		if (packet->stream) {
			BT_LOGD_STR("Recycling packet's header field.");
			bt_packet_header_field_recycle(packet->header,
				bt_stream_class_borrow_trace(
					bt_stream_borrow_class(packet->stream)));
		} else {
			bt_field_wrapper_destroy(packet->header);
		}
	}

	if (packet->context) {
		if (packet->stream) {
			BT_LOGD_STR("Recycling packet's context field.");
			bt_packet_context_field_recycle(packet->context,
				bt_stream_borrow_class(packet->stream));
		} else {
			bt_field_wrapper_destroy(packet->context);
		}
	}

	BT_LOGD_STR("Putting packet's stream.");
	bt_put(packet->stream);
	g_free(packet);
}

BT_HIDDEN
struct bt_packet *bt_packet_new(struct bt_stream *stream)
{
	struct bt_packet *packet = NULL;
	struct bt_stream_class *stream_class = NULL;
	struct bt_trace *trace = NULL;

	BT_ASSERT(stream);
	BT_LOGD("Creating packet object: stream-addr=%p, "
		"stream-name=\"%s\", stream-class-addr=%p, "
		"stream-class-name=\"%s\", stream-class-id=%" PRId64,
		stream, bt_stream_get_name(stream),
		stream->common.stream_class,
		bt_stream_class_common_get_name(stream->common.stream_class),
		bt_stream_class_common_get_id(stream->common.stream_class));
	stream_class = bt_stream_borrow_class(stream);
	BT_ASSERT(stream_class);
	trace = bt_stream_class_borrow_trace(stream_class);
	BT_ASSERT(trace);
	packet = g_new0(struct bt_packet, 1);
	if (!packet) {
		BT_LOGE_STR("Failed to allocate one packet object.");
		goto end;
	}

	bt_object_init_shared(&packet->base,
		(bt_object_release_func) bt_packet_recycle);
	packet->stream = bt_get(stream);

	if (trace->common.packet_header_field_type) {
		BT_LOGD("Creating initial packet header field: ft-addr=%p",
			trace->common.packet_header_field_type);
		packet->header = bt_field_wrapper_create(
			&trace->packet_header_field_pool,
			(void *) trace->common.packet_header_field_type);
		if (!packet->header) {
			BT_LOGE("Cannot create packet header field wrapper.");
			BT_PUT(packet);
			goto end;
		}
	}

	if (stream->common.stream_class->packet_context_field_type) {
		BT_LOGD("Creating initial packet context field: ft-addr=%p",
			stream->common.stream_class->packet_context_field_type);
		packet->context = bt_field_wrapper_create(
			&stream_class->packet_context_field_pool,
			(void *) stream->common.stream_class->packet_context_field_type);
		if (!packet->context) {
			BT_LOGE("Cannot create packet context field wrapper.");
			BT_PUT(packet);
			goto end;
		}
	}

	BT_LOGD("Created packet object: addr=%p", packet);

end:
	return packet;
}

struct bt_packet *bt_packet_create(struct bt_stream *stream)
{
	struct bt_packet *packet = NULL;

	BT_ASSERT_PRE_NON_NULL(stream, "Stream");
	packet = bt_object_pool_create_object(&stream->packet_pool);
	if (unlikely(!packet)) {
		BT_LIB_LOGE("Cannot allocate one packet from stream's packet pool: "
			"%![stream-]+s", stream);
		goto end;
	}

	if (unlikely(!packet->stream)) {
		packet->stream = stream;
		bt_object_get_no_null_check_no_parent_check(
			&packet->stream->common.base);
	}

	goto end;

end:
	return packet;
}

int bt_packet_move_header(struct bt_packet *packet,
		struct bt_packet_header_field *header_field)
{
	struct bt_trace *trace;
	struct bt_field_wrapper *field_wrapper = (void *) header_field;

	BT_ASSERT_PRE_NON_NULL(packet, "Event");
	BT_ASSERT_PRE_NON_NULL(field_wrapper, "Header field");
	BT_ASSERT_PRE_HOT(packet, "Packet", ": +%!+a", packet);
	trace = bt_stream_class_borrow_trace(
		bt_stream_borrow_class(packet->stream));
	BT_ASSERT_PRE(trace->common.packet_header_field_type,
		"Trace has no packet header field type: %!+t",
		trace);

	/* TODO: compare field types (precondition) */

	/* Recycle current header field: always exists */
	BT_ASSERT(packet->header);
	bt_packet_header_field_recycle(packet->header, trace);

	/* Move new field */
	packet->header = field_wrapper;
	return 0;
}

int bt_packet_move_context(struct bt_packet *packet,
		struct bt_packet_context_field *context_field)
{
	struct bt_stream_class *stream_class;
	struct bt_field_wrapper *field_wrapper = (void *) context_field;

	BT_ASSERT_PRE_NON_NULL(packet, "Event");
	BT_ASSERT_PRE_NON_NULL(field_wrapper, "Context field");
	BT_ASSERT_PRE_HOT(packet, "Packet", ": +%!+a", packet);
	stream_class = bt_stream_borrow_class(packet->stream);
	BT_ASSERT_PRE(stream_class->common.packet_context_field_type,
		"Stream class has no packet context field type: %!+S",
		stream_class);

	/* TODO: compare field types (precondition) */

	/* Recycle current context field: always exists */
	BT_ASSERT(packet->context);
	bt_packet_context_field_recycle(packet->context, stream_class);

	/* Move new field */
	packet->context = field_wrapper;
	return 0;
}
Commit	Line	Data
f79cf0f0 PP	1	/*
	2	* packet.c
	3	*
	4	* Babeltrace CTF IR - Stream packet
	5	*
	6	* Copyright 2016 Philippe Proulx <pproulx@efficios.com>
	7	*
	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
	14	*
	15	* The above copyright notice and this permission notice shall be included in
	16	* all copies or substantial portions of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	21	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	24	* SOFTWARE.
	25	*/
	26
8ea705f0	27	#define BT_LOG_TAG "PACKET"
be514b0c	28	#include <babeltrace/lib-logging-internal.h>
8ea705f0	29
3dca2276	30	#include <babeltrace/assert-pre-internal.h>
f79cf0f0 PP	31	#include <babeltrace/ctf-ir/fields-internal.h>
	32	#include <babeltrace/ctf-ir/packet.h>
	33	#include <babeltrace/ctf-ir/packet-internal.h>
312c056a	34	#include <babeltrace/ctf-ir/field-wrapper-internal.h>
f79cf0f0 PP	35	#include <babeltrace/ctf-ir/trace.h>
	36	#include <babeltrace/ctf-ir/stream-class-internal.h>
	37	#include <babeltrace/ctf-ir/stream-class.h>
	38	#include <babeltrace/ctf-ir/stream.h>
	39	#include <babeltrace/ctf-ir/stream-internal.h>
	40	#include <babeltrace/ctf-ir/trace-internal.h>
	41	#include <babeltrace/object-internal.h>
	42	#include <babeltrace/ref.h>
f6ccaed9	43	#include <babeltrace/assert-internal.h>
be514b0c	44	#include <inttypes.h>
f79cf0f0	45
094ff7c0	46	struct bt_stream bt_packet_borrow_stream(struct bt_packet packet)
f79cf0f0	47	{
f6ccaed9	48	BT_ASSERT_PRE_NON_NULL(packet, "Packet");
094ff7c0	49	return packet->stream;
f79cf0f0 PP	50	}
f79cf0f0 PP	51
312c056a	52	struct bt_field bt_packet_borrow_header(struct bt_packet packet)
f79cf0f0	53	{
f6ccaed9	54	BT_ASSERT_PRE_NON_NULL(packet, "Packet");
312c056a	55	return packet->header ? (void *) packet->header->field : NULL;
f79cf0f0 PP	56	}
f79cf0f0 PP	57
312c056a	58	struct bt_field bt_packet_borrow_context(struct bt_packet packet)
f79cf0f0	59	{
312c056a PP	60	BT_ASSERT_PRE_NON_NULL(packet, "Packet");
	61	return packet->context ? (void *) packet->context->field : NULL;
	62	}
c5c82c6e	63
312c056a	64	BT_HIDDEN
6c677fb5	65	void _bt_packet_set_is_frozen(struct bt_packet *packet, bool is_frozen)
312c056a PP	66	{
	67	if (!packet \|\| packet->frozen) {
	68	return;
c5c82c6e PP	69	}
c5c82c6e PP	70
312c056a PP	71	BT_LOGD("Freezing packet: addr=%p", packet);
	72
	73	if (packet->header) {
	74	BT_LOGD_STR("Freezing packet's header field.");
6c677fb5 PP	75	bt_field_set_is_frozen_recursive((void *) packet->header->field,
6c677fb5 PP	76	is_frozen);
f79cf0f0 PP	77	}
f79cf0f0 PP	78
312c056a PP	79	if (packet->context) {
312c056a PP	80	BT_LOGD_STR("Freezing packet's context field.");
6c677fb5 PP	81	bt_field_set_is_frozen_recursive((void *) packet->context->field,
6c677fb5 PP	82	is_frozen);
312c056a PP	83	}
312c056a PP	84
6c677fb5	85	packet->frozen = is_frozen;
f6ccaed9 PP	86	}
f6ccaed9 PP	87
312c056a PP	88	static inline
312c056a PP	89	void bt_packet_reset(struct bt_packet *packet)
f6ccaed9	90	{
312c056a	91	BT_ASSERT(packet);
6c677fb5	92	bt_packet_set_is_frozen(packet, false);
312c056a PP	93
	94	if (packet->header) {
	95	bt_field_set_is_frozen_recursive(
	96	(void *) packet->header->field, false);
	97	bt_field_reset_recursive((void *) packet->header->field);
	98	}
	99
	100	if (packet->context) {
	101	bt_field_set_is_frozen_recursive(
	102	(void *) packet->context->field, false);
	103	bt_field_reset_recursive((void *) packet->context->field);
	104	}
f79cf0f0 PP	105	}
f79cf0f0 PP	106
312c056a PP	107	static
	108	void bt_packet_header_field_recycle(struct bt_field_wrapper *header_field,
	109	struct bt_trace *trace)
f79cf0f0	110	{
312c056a PP	111	BT_ASSERT(header_field);
	112	BT_LIB_LOGD("Recycling packet header field: "
	113	"addr=%p, %![trace-]+t, %![field-]+f", header_field,
	114	trace, header_field->field);
	115	bt_object_pool_recycle_object(&trace->packet_header_field_pool,
	116	header_field);
f79cf0f0 PP	117	}
f79cf0f0 PP	118
312c056a PP	119	static
	120	void bt_packet_context_field_recycle(struct bt_field_wrapper *context_field,
	121	struct bt_stream_class *stream_class)
f79cf0f0	122	{
312c056a PP	123	BT_ASSERT(context_field);
	124	BT_LIB_LOGD("Recycling packet context field: "
	125	"addr=%p, %![sc-]+S, %![field-]+f", context_field,
	126	stream_class, context_field->field);
	127	bt_object_pool_recycle_object(&stream_class->packet_context_field_pool,
	128	context_field);
f79cf0f0 PP	129	}
	130
	131	BT_HIDDEN
312c056a	132	void bt_packet_recycle(struct bt_packet *packet)
f79cf0f0	133	{
312c056a	134	struct bt_stream *stream;
f79cf0f0	135
312c056a PP	136	BT_ASSERT(packet);
	137	BT_LIB_LOGD("Recycling packet: %!+a", packet);
	138
	139	/*
	140	* Those are the important ordered steps:
	141	*
	142	* 1. Reset the packet object (put any permanent reference it
	143	* has, unfreeze it and its fields in developer mode, etc.),
	144	* but do NOT put its stream's reference. This stream
	145	* contains the pool to which we're about to recycle this
	146	* packet object, so we must guarantee its existence thanks
	147	* to this existing reference.
	148	*
	149	* 2. Move the stream reference to our `stream`
	150	* variable so that we can set the packet's stream member
	151	* to NULL before recycling it. We CANNOT do this after
	152	* we put the stream reference because this bt_put()
	153	* could destroy the stream, also destroying its
	154	* packet pool, thus also destroying our packet object (this
	155	* would result in an invalid write access).
	156	*
	157	* 3. Recycle the packet object.
	158	*
	159	* 4. Put our stream reference.
	160	*/
	161	bt_packet_reset(packet);
	162	stream = packet->stream;
	163	BT_ASSERT(stream);
	164	packet->stream = NULL;
	165	bt_object_pool_recycle_object(&stream->packet_pool, packet);
6c677fb5	166	bt_object_put_no_null_check(&stream->common.base);
f79cf0f0 PP	167	}
f79cf0f0 PP	168
312c056a PP	169	BT_HIDDEN
312c056a PP	170	void bt_packet_destroy(struct bt_packet *packet)
f79cf0f0	171	{
8ea705f0	172	BT_LOGD("Destroying packet: addr=%p", packet);
312c056a PP	173	BT_LOGD_STR("Destroying packet's header field.");
	174
	175	if (packet->header) {
	176	if (packet->stream) {
	177	BT_LOGD_STR("Recycling packet's header field.");
	178	bt_packet_header_field_recycle(packet->header,
	179	bt_stream_class_borrow_trace(
	180	bt_stream_borrow_class(packet->stream)));
	181	} else {
	182	bt_field_wrapper_destroy(packet->header);
	183	}
	184	}
	185
	186	if (packet->context) {
	187	if (packet->stream) {
	188	BT_LOGD_STR("Recycling packet's context field.");
	189	bt_packet_context_field_recycle(packet->context,
	190	bt_stream_borrow_class(packet->stream));
	191	} else {
	192	bt_field_wrapper_destroy(packet->context);
	193	}
	194	}
	195
d409daba	196	BT_LOGD_STR("Putting packet's stream.");
f79cf0f0 PP	197	bt_put(packet->stream);
	198	g_free(packet);
	199	}
	200
312c056a PP	201	BT_HIDDEN
312c056a PP	202	struct bt_packet bt_packet_new(struct bt_stream stream)
f79cf0f0	203	{
50842bdc PP	204	struct bt_packet *packet = NULL;
	205	struct bt_stream_class *stream_class = NULL;
	206	struct bt_trace *trace = NULL;
f79cf0f0	207
312c056a	208	BT_ASSERT(stream);
be514b0c PP	209	BT_LOGD("Creating packet object: stream-addr=%p, "
	210	"stream-name=\"%s\", stream-class-addr=%p, "
	211	"stream-class-name=\"%s\", stream-class-id=%" PRId64,
50842bdc	212	stream, bt_stream_get_name(stream),
3dca2276 PP	213	stream->common.stream_class,
	214	bt_stream_class_common_get_name(stream->common.stream_class),
	215	bt_stream_class_common_get_id(stream->common.stream_class));
094ff7c0	216	stream_class = bt_stream_borrow_class(stream);
f6ccaed9	217	BT_ASSERT(stream_class);
094ff7c0	218	trace = bt_stream_class_borrow_trace(stream_class);
f6ccaed9	219	BT_ASSERT(trace);
50842bdc	220	packet = g_new0(struct bt_packet, 1);
f79cf0f0	221	if (!packet) {
8ea705f0	222	BT_LOGE_STR("Failed to allocate one packet object.");
f79cf0f0 PP	223	goto end;
	224	}
	225
3fea54f6 PP	226	bt_object_init_shared(&packet->base,
3fea54f6 PP	227	(bt_object_release_func) bt_packet_recycle);
f79cf0f0	228	packet->stream = bt_get(stream);
be514b0c	229
3dca2276	230	if (trace->common.packet_header_field_type) {
be514b0c	231	BT_LOGD("Creating initial packet header field: ft-addr=%p",
3dca2276	232	trace->common.packet_header_field_type);
312c056a PP	233	packet->header = bt_field_wrapper_create(
	234	&trace->packet_header_field_pool,
	235	(void *) trace->common.packet_header_field_type);
be514b0c	236	if (!packet->header) {
312c056a	237	BT_LOGE("Cannot create packet header field wrapper.");
be514b0c PP	238	BT_PUT(packet);
	239	goto end;
	240	}
f79cf0f0 PP	241	}
f79cf0f0 PP	242
3dca2276	243	if (stream->common.stream_class->packet_context_field_type) {
be514b0c	244	BT_LOGD("Creating initial packet context field: ft-addr=%p",
3dca2276	245	stream->common.stream_class->packet_context_field_type);
312c056a PP	246	packet->context = bt_field_wrapper_create(
	247	&stream_class->packet_context_field_pool,
	248	(void *) stream->common.stream_class->packet_context_field_type);
be514b0c	249	if (!packet->context) {
312c056a	250	BT_LOGE("Cannot create packet context field wrapper.");
be514b0c PP	251	BT_PUT(packet);
	252	goto end;
	253	}
f79cf0f0 PP	254	}
f79cf0f0 PP	255
8ea705f0 PP	256	BT_LOGD("Created packet object: addr=%p", packet);
8ea705f0 PP	257
f79cf0f0	258	end:
f79cf0f0 PP	259	return packet;
f79cf0f0 PP	260	}
312c056a PP	261
	262	struct bt_packet bt_packet_create(struct bt_stream stream)
	263	{
	264	struct bt_packet *packet = NULL;
	265
	266	BT_ASSERT_PRE_NON_NULL(stream, "Stream");
	267	packet = bt_object_pool_create_object(&stream->packet_pool);
6c677fb5	268	if (unlikely(!packet)) {
312c056a PP	269	BT_LIB_LOGE("Cannot allocate one packet from stream's packet pool: "
312c056a PP	270	"%![stream-]+s", stream);
6c677fb5	271	goto end;
312c056a PP	272	}
312c056a PP	273
6c677fb5 PP	274	if (unlikely(!packet->stream)) {
	275	packet->stream = stream;
	276	bt_object_get_no_null_check_no_parent_check(
	277	&packet->stream->common.base);
312c056a PP	278	}
	279
	280	goto end;
	281
312c056a PP	282	end:
	283	return packet;
	284	}
	285
	286	int bt_packet_move_header(struct bt_packet *packet,
	287	struct bt_packet_header_field *header_field)
	288	{
	289	struct bt_trace *trace;
	290	struct bt_field_wrapper field_wrapper = (void ) header_field;
	291
	292	BT_ASSERT_PRE_NON_NULL(packet, "Event");
	293	BT_ASSERT_PRE_NON_NULL(field_wrapper, "Header field");
	294	BT_ASSERT_PRE_HOT(packet, "Packet", ": +%!+a", packet);
	295	trace = bt_stream_class_borrow_trace(
	296	bt_stream_borrow_class(packet->stream));
	297	BT_ASSERT_PRE(trace->common.packet_header_field_type,
	298	"Trace has no packet header field type: %!+t",
	299	trace);
	300
	301	/* TODO: compare field types (precondition) */
	302
	303	/* Recycle current header field: always exists */
	304	BT_ASSERT(packet->header);
	305	bt_packet_header_field_recycle(packet->header, trace);
	306
	307	/* Move new field */
	308	packet->header = field_wrapper;
	309	return 0;
	310	}
	311
	312	int bt_packet_move_context(struct bt_packet *packet,
	313	struct bt_packet_context_field *context_field)
	314	{
	315	struct bt_stream_class *stream_class;
	316	struct bt_field_wrapper field_wrapper = (void ) context_field;
	317
	318	BT_ASSERT_PRE_NON_NULL(packet, "Event");
	319	BT_ASSERT_PRE_NON_NULL(field_wrapper, "Context field");
	320	BT_ASSERT_PRE_HOT(packet, "Packet", ": +%!+a", packet);
	321	stream_class = bt_stream_borrow_class(packet->stream);
	322	BT_ASSERT_PRE(stream_class->common.packet_context_field_type,
	323	"Stream class has no packet context field type: %!+S",
	324	stream_class);
	325
	326	/* TODO: compare field types (precondition) */
	327
	328	/* Recycle current context field: always exists */
	329	BT_ASSERT(packet->context);
	330	bt_packet_context_field_recycle(packet->context, stream_class);
	331
	332	/* Move new field */
	333	packet->context = field_wrapper;
	334	return 0;
	335	}