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

/*
 * trace.c
 *
 * Babeltrace CTF IR - Trace
 *
 * Copyright 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.
 */

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

#include <babeltrace/ctf-ir/trace-internal.h>
#include <babeltrace/ctf-ir/clock-class-internal.h>
#include <babeltrace/ctf-ir/stream-internal.h>
#include <babeltrace/ctf-ir/stream-class-internal.h>
#include <babeltrace/ctf-ir/event-internal.h>
#include <babeltrace/ctf-ir/event-class.h>
#include <babeltrace/ctf-ir/event-class-internal.h>
#include <babeltrace/ctf-writer/functor-internal.h>
#include <babeltrace/ctf-writer/clock-internal.h>
#include <babeltrace/ctf-ir/field-types-internal.h>
#include <babeltrace/ctf-ir/attributes-internal.h>
#include <babeltrace/ctf-ir/validation-internal.h>
#include <babeltrace/ctf-ir/visitor-internal.h>
#include <babeltrace/ctf-ir/utils.h>
#include <babeltrace/ctf-ir/utils-internal.h>
#include <babeltrace/compiler-internal.h>
#include <babeltrace/values.h>
#include <babeltrace/values-internal.h>
#include <babeltrace/ref.h>
#include <babeltrace/types.h>
#include <babeltrace/endian-internal.h>
#include <babeltrace/assert-internal.h>
#include <babeltrace/assert-pre-internal.h>
#include <inttypes.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>

#define DEFAULT_IDENTIFIER_SIZE 128
#define DEFAULT_METADATA_STRING_SIZE 4096

struct listener_wrapper {
	bt_listener_cb listener;
	void *data;
};

struct bt_trace_is_static_listener_elem {
	bt_trace_is_static_listener func;
	bt_trace_listener_removed removed;
	void *data;
};

static
void bt_trace_destroy(struct bt_object *obj);
static
void bt_trace_freeze(struct bt_trace *trace);

static
const unsigned int field_type_aliases_alignments[] = {
	[FIELD_TYPE_ALIAS_UINT5_T] = 1,
	[FIELD_TYPE_ALIAS_UINT8_T ... FIELD_TYPE_ALIAS_UINT16_T] = 8,
	[FIELD_TYPE_ALIAS_UINT27_T] = 1,
	[FIELD_TYPE_ALIAS_UINT32_T ... FIELD_TYPE_ALIAS_UINT64_T] = 8,
};

static
const unsigned int field_type_aliases_sizes[] = {
	[FIELD_TYPE_ALIAS_UINT5_T] = 5,
	[FIELD_TYPE_ALIAS_UINT8_T] = 8,
	[FIELD_TYPE_ALIAS_UINT16_T] = 16,
	[FIELD_TYPE_ALIAS_UINT27_T] = 27,
	[FIELD_TYPE_ALIAS_UINT32_T] = 32,
	[FIELD_TYPE_ALIAS_UINT64_T] = 64,
};

struct bt_trace *bt_trace_create(void)
{
	struct bt_trace *trace = NULL;

	trace = g_new0(struct bt_trace, 1);
	if (!trace) {
		BT_LOGE_STR("Failed to allocate one trace.");
		goto error;
	}

	BT_LOGD_STR("Creating trace object.");
	trace->native_byte_order = BT_BYTE_ORDER_UNSPECIFIED;
	bt_object_init(trace, bt_trace_destroy);
	trace->clocks = g_ptr_array_new_with_free_func(
		(GDestroyNotify) bt_put);
	if (!trace->clocks) {
		BT_LOGE_STR("Failed to allocate one GPtrArray.");
		goto error;
	}

	trace->streams = g_ptr_array_new_with_free_func(
		(GDestroyNotify) bt_object_release);
	if (!trace->streams) {
		BT_LOGE_STR("Failed to allocate one GPtrArray.");
		goto error;
	}

	trace->stream_classes = g_ptr_array_new_with_free_func(
		(GDestroyNotify) bt_object_release);
	if (!trace->stream_classes) {
		BT_LOGE_STR("Failed to allocate one GPtrArray.");
		goto error;
	}

	/* Create the environment array object */
	trace->environment = bt_attributes_create();
	if (!trace->environment) {
		BT_LOGE_STR("Cannot create empty attributes object.");
		goto error;
	}

	trace->listeners = g_ptr_array_new_with_free_func(
			(GDestroyNotify) g_free);
	if (!trace->listeners) {
		BT_LOGE_STR("Failed to allocate one GPtrArray.");
		goto error;
	}

	trace->is_static_listeners = g_array_new(FALSE, TRUE,
		sizeof(struct bt_trace_is_static_listener_elem));
	if (!trace->is_static_listeners) {
		BT_LOGE_STR("Failed to allocate one GArray.");
		goto error;
	}

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

error:
	BT_PUT(trace);
	return trace;
}

const char *bt_trace_get_name(struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return trace->name ? trace->name->str : NULL;
}

int bt_trace_set_name(struct bt_trace *trace, const char *name)
{
	int ret = 0;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (!name) {
		BT_LOGW_STR("Invalid parameter: name is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->frozen) {
		BT_LOGW("Invalid parameter: trace is frozen: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	trace->name = trace->name ? g_string_assign(trace->name, name) :
			g_string_new(name);
	if (!trace->name) {
		BT_LOGE_STR("Failed to allocate one GString.");
		ret = -1;
		goto end;
	}

	BT_LOGV("Set trace's name: addr=%p, name=\"%s\"", trace, name);

end:
	return ret;
}

const unsigned char *bt_trace_get_uuid(struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return trace->uuid_set ? trace->uuid : NULL;
}

int bt_trace_set_uuid(struct bt_trace *trace, const unsigned char *uuid)
{
	int ret = 0;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (!uuid) {
		BT_LOGW_STR("Invalid parameter: UUID is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->frozen) {
		BT_LOGW("Invalid parameter: trace is frozen: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	memcpy(trace->uuid, uuid, BABELTRACE_UUID_LEN);
	trace->uuid_set = BT_TRUE;
	BT_LOGV("Set trace's UUID: addr=%p, name=\"%s\", "
		"uuid=\"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\"",
		trace, bt_trace_get_name(trace),
		(unsigned int) uuid[0],
		(unsigned int) uuid[1],
		(unsigned int) uuid[2],
		(unsigned int) uuid[3],
		(unsigned int) uuid[4],
		(unsigned int) uuid[5],
		(unsigned int) uuid[6],
		(unsigned int) uuid[7],
		(unsigned int) uuid[8],
		(unsigned int) uuid[9],
		(unsigned int) uuid[10],
		(unsigned int) uuid[11],
		(unsigned int) uuid[12],
		(unsigned int) uuid[13],
		(unsigned int) uuid[14],
		(unsigned int) uuid[15]);

end:
	return ret;
}

void bt_trace_destroy(struct bt_object *obj)
{
	struct bt_trace *trace;

	trace = container_of(obj, struct bt_trace, base);

	BT_LOGD("Destroying trace object: addr=%p, name=\"%s\"",
		trace, bt_trace_get_name(trace));

	/*
	 * Call remove listeners first so that everything else still
	 * exists in the trace.
	 */
	if (trace->is_static_listeners) {
		size_t i;

		for (i = 0; i < trace->is_static_listeners->len; i++) {
			struct bt_trace_is_static_listener_elem elem =
				g_array_index(trace->is_static_listeners,
					struct bt_trace_is_static_listener_elem, i);

			if (elem.removed) {
				elem.removed(trace, elem.data);
			}
		}

		g_array_free(trace->is_static_listeners, TRUE);
	}

	if (trace->listeners) {
		g_ptr_array_free(trace->listeners, TRUE);
	}

	if (trace->environment) {
		BT_LOGD_STR("Destroying environment attributes.");
		bt_attributes_destroy(trace->environment);
	}

	if (trace->name) {
		g_string_free(trace->name, TRUE);
	}

	if (trace->clocks) {
		BT_LOGD_STR("Putting clock classes.");
		g_ptr_array_free(trace->clocks, TRUE);
	}

	if (trace->streams) {
		BT_LOGD_STR("Destroying streams.");
		g_ptr_array_free(trace->streams, TRUE);
	}

	if (trace->stream_classes) {
		BT_LOGD_STR("Destroying stream classes.");
		g_ptr_array_free(trace->stream_classes, TRUE);
	}

	BT_LOGD_STR("Putting packet header field type.");
	bt_put(trace->packet_header_type);
	g_free(trace);
}

int bt_trace_set_environment_field(struct bt_trace *trace,
		const char *name, struct bt_value *value)
{
	int ret = 0;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (!name) {
		BT_LOGW_STR("Invalid parameter: name is NULL.");
		ret = -1;
		goto end;
	}

	if (!value) {
		BT_LOGW_STR("Invalid parameter: value is NULL.");
		ret = -1;
		goto end;
	}

	if (!bt_identifier_is_valid(name)) {
		BT_LOGW("Invalid parameter: environment field's name is not a valid CTF identifier: "
			"trace-addr=%p, trace-name=\"%s\", "
			"env-name=\"%s\"",
			trace, bt_trace_get_name(trace), name);
		ret = -1;
		goto end;
	}

	if (!bt_value_is_integer(value) && !bt_value_is_string(value)) {
		BT_LOGW("Invalid parameter: environment field's value is not an integer or string value: "
			"trace-addr=%p, trace-name=\"%s\", "
			"env-name=\"%s\", env-value-type=%s",
			trace, bt_trace_get_name(trace), name,
			bt_value_type_string(bt_value_get_type(value)));
		ret = -1;
		goto end;
	}

	if (trace->is_static) {
		BT_LOGW("Invalid parameter: trace is static: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	if (trace->frozen) {
		/*
		 * New environment fields may be added to a frozen trace,
		 * but existing fields may not be changed.
		 *
		 * The object passed is frozen like all other attributes.
		 */
		struct bt_value *attribute =
			bt_attributes_get_field_value_by_name(
				trace->environment, name);

		if (attribute) {
			BT_LOGW("Invalid parameter: trace is frozen and environment field already exists with this name: "
				"trace-addr=%p, trace-name=\"%s\", "
				"env-name=\"%s\"",
				trace, bt_trace_get_name(trace), name);
			BT_PUT(attribute);
			ret = -1;
			goto end;
		}

		bt_value_freeze(value);
	}

	ret = bt_attributes_set_field_value(trace->environment, name,
		value);
	if (ret) {
		BT_LOGE("Cannot set environment field's value: "
			"trace-addr=%p, trace-name=\"%s\", "
			"env-name=\"%s\"",
			trace, bt_trace_get_name(trace), name);
	} else {
		BT_LOGV("Set environment field's value: "
			"trace-addr=%p, trace-name=\"%s\", "
			"env-name=\"%s\", value-addr=%p",
			trace, bt_trace_get_name(trace), name, value);
	}

end:
	return ret;
}

int bt_trace_set_environment_field_string(struct bt_trace *trace,
		const char *name, const char *value)
{
	int ret = 0;
	struct bt_value *env_value_string_obj = NULL;

	if (!value) {
		BT_LOGW_STR("Invalid parameter: value is NULL.");
		ret = -1;
		goto end;
	}

	env_value_string_obj = bt_value_string_create_init(value);
	if (!env_value_string_obj) {
		BT_LOGE_STR("Cannot create string value object.");
		ret = -1;
		goto end;
	}

	/* bt_trace_set_environment_field() logs errors */
	ret = bt_trace_set_environment_field(trace, name,
		env_value_string_obj);

end:
	bt_put(env_value_string_obj);
	return ret;
}

int bt_trace_set_environment_field_integer(struct bt_trace *trace,
		const char *name, int64_t value)
{
	int ret = 0;
	struct bt_value *env_value_integer_obj = NULL;

	env_value_integer_obj = bt_value_integer_create_init(value);
	if (!env_value_integer_obj) {
		BT_LOGE_STR("Cannot create integer value object.");
		ret = -1;
		goto end;
	}

	/* bt_trace_set_environment_field() logs errors */
	ret = bt_trace_set_environment_field(trace, name,
		env_value_integer_obj);

end:
	bt_put(env_value_integer_obj);
	return ret;
}

int64_t bt_trace_get_environment_field_count(struct bt_trace *trace)
{
	int64_t ret;

	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	ret = bt_attributes_get_count(trace->environment);
	BT_ASSERT(ret >= 0);
	return ret;
}

const char *
bt_trace_get_environment_field_name_by_index(struct bt_trace *trace,
		uint64_t index)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return bt_attributes_get_field_name(trace->environment, index);
}

struct bt_value *bt_trace_get_environment_field_value_by_index(
		struct bt_trace *trace, uint64_t index)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return bt_attributes_get_field_value(trace->environment, index);
}

struct bt_value *bt_trace_get_environment_field_value_by_name(
		struct bt_trace *trace, const char *name)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	BT_ASSERT_PRE_NON_NULL(name, "Name");
	return bt_attributes_get_field_value_by_name(trace->environment,
		name);
}

int bt_trace_add_clock_class(struct bt_trace *trace,
		struct bt_clock_class *clock_class)
{
	int ret = 0;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->is_static) {
		BT_LOGW("Invalid parameter: trace is static: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	if (!bt_clock_class_is_valid(clock_class)) {
		BT_LOGW("Invalid parameter: clock class is invalid: "
			"trace-addr=%p, trace-name=\"%s\", "
			"clock-class-addr=%p, clock-class-name=\"%s\"",
			trace, bt_trace_get_name(trace),
			clock_class, bt_clock_class_get_name(clock_class));
		ret = -1;
		goto end;
	}

	/* Check for duplicate clock classes */
	if (bt_trace_has_clock_class(trace, clock_class)) {
		BT_LOGW("Invalid parameter: clock class already exists in trace: "
			"trace-addr=%p, trace-name=\"%s\", "
			"clock-class-addr=%p, clock-class-name=\"%s\"",
			trace, bt_trace_get_name(trace),
			clock_class, bt_clock_class_get_name(clock_class));
		ret = -1;
		goto end;
	}

	bt_get(clock_class);
	g_ptr_array_add(trace->clocks, clock_class);

	if (trace->frozen) {
		BT_LOGV_STR("Freezing added clock class because trace is frozen.");
		bt_clock_class_freeze(clock_class);
	}

	BT_LOGV("Added clock class to trace: "
		"trace-addr=%p, trace-name=\"%s\", "
		"clock-class-addr=%p, clock-class-name=\"%s\"",
		trace, bt_trace_get_name(trace),
		clock_class, bt_clock_class_get_name(clock_class));

end:
	return ret;
}

int64_t bt_trace_get_clock_class_count(struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return trace->clocks->len;
}

struct bt_clock_class *bt_trace_get_clock_class_by_index(
		struct bt_trace *trace, uint64_t index)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	BT_ASSERT_PRE(index < trace->clocks->len,
		"Index is out of bounds: index=%" PRIu64 ", "
		"count=%u",
		index, trace->clocks->len);
	return bt_get(g_ptr_array_index(trace->clocks, index));
}

static
bool packet_header_field_type_is_valid(struct bt_trace *trace,
		struct bt_field_type *packet_header_type)
{
	int ret;
	bool is_valid = true;
	struct bt_field_type *field_type = NULL;

	if (!packet_header_type) {
		/*
		 * No packet header field type: trace must have only
		 * one stream. At this point the stream class being
		 * added is not part of the trace yet, so we validate
		 * that the trace contains no stream classes yet.
		 */
		if (trace->stream_classes->len >= 1) {
			BT_LOGW_STR("Invalid packet header field type: "
				"packet header field type does not exist but there's more than one stream class in the trace.");
			goto invalid;
		}

		/* No packet header field type: valid at this point */
		goto end;
	}

	/* Packet header field type, if it exists, must be a structure */
	if (!bt_field_type_is_structure(packet_header_type)) {
		BT_LOGW("Invalid packet header field type: must be a structure field type if it exists: "
			"ft-addr=%p, ft-id=%s",
			packet_header_type,
			bt_field_type_id_string(packet_header_type->id));
		goto invalid;
	}

	/*
	 * If there's a `magic` field, it must be a 32-bit unsigned
	 * integer field type. Also it must be the first field of the
	 * packet header field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_header_type, "magic");
	if (field_type) {
		const char *field_name;

		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet header field type: `magic` field must be an integer field type: "
				"magic-ft-addr=%p, magic-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet header field type: `magic` field must be an unsigned integer field type: "
				"magic-ft-addr=%p", field_type);
			goto invalid;
		}

		if (bt_field_type_integer_get_size(field_type) != 32) {
			BT_LOGW("Invalid packet header field type: `magic` field must be a 32-bit unsigned integer field type: "
				"magic-ft-addr=%p, magic-ft-size=%u",
				field_type,
				bt_field_type_integer_get_size(field_type));
			goto invalid;
		}

		ret = bt_field_type_structure_get_field_by_index(
			packet_header_type, &field_name, NULL, 0);
		BT_ASSERT(ret == 0);

		if (strcmp(field_name, "magic") != 0) {
			BT_LOGW("Invalid packet header field type: `magic` field must be the first field: "
				"magic-ft-addr=%p, first-field-name=\"%s\"",
				field_type, field_name);
			goto invalid;
		}

		BT_PUT(field_type);
	}

	/*
	 * If there's a `uuid` field, it must be an array field type of
	 * length 16 with an 8-bit unsigned integer element field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_header_type, "uuid");
	if (field_type) {
		struct bt_field_type *elem_ft;

		if (!bt_field_type_is_array(field_type)) {
			BT_LOGW("Invalid packet header field type: `uuid` field must be an array field type: "
				"uuid-ft-addr=%p, uuid-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_array_get_length(field_type) != 16) {
			BT_LOGW("Invalid packet header field type: `uuid` array field type's length must be 16: "
				"uuid-ft-addr=%p, uuid-ft-length=%" PRId64,
				field_type,
				bt_field_type_array_get_length(field_type));
			goto invalid;
		}

		elem_ft = bt_field_type_array_get_element_type(field_type);
		BT_ASSERT(elem_ft);

		if (!bt_field_type_is_integer(elem_ft)) {
			BT_LOGW("Invalid packet header field type: `uuid` field's element field type must be an integer field type: "
				"elem-ft-addr=%p, elem-ft-id=%s",
				elem_ft,
				bt_field_type_id_string(elem_ft->id));
			bt_put(elem_ft);
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(elem_ft)) {
			BT_LOGW("Invalid packet header field type: `uuid` field's element field type must be an unsigned integer field type: "
				"elem-ft-addr=%p", elem_ft);
			bt_put(elem_ft);
			goto invalid;
		}

		if (bt_field_type_integer_get_size(elem_ft) != 8) {
			BT_LOGW("Invalid packet header field type: `uuid` field's element field type must be an 8-bit unsigned integer field type: "
				"elem-ft-addr=%p, elem-ft-size=%u",
				elem_ft,
				bt_field_type_integer_get_size(elem_ft));
			bt_put(elem_ft);
			goto invalid;
		}

		bt_put(elem_ft);
		BT_PUT(field_type);
	}

	/*
	 * The `stream_id` field must exist if there's more than one
	 * stream classes in the trace.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_header_type, "stream_id");

	if (!field_type && trace->stream_classes->len >= 1) {
		BT_LOGW_STR("Invalid packet header field type: "
			"`stream_id` field does not exist but there's more than one stream class in the trace.");
		goto invalid;
	}

	/*
	 * If there's a `stream_id` field, it must be an unsigned
	 * integer field type.
	 */
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet header field type: `stream_id` field must be an integer field type: "
				"stream-id-ft-addr=%p, stream-id-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet header field type: `stream_id` field must be an unsigned integer field type: "
				"stream-id-ft-addr=%p", field_type);
			goto invalid;
		}

		BT_PUT(field_type);
	}

	/*
	 * If there's a `packet_seq_num` field, it must be an unsigned
	 * integer field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_header_type, "packet_seq_num");
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet header field type: `packet_seq_num` field must be an integer field type: "
				"stream-id-ft-addr=%p, packet-seq-num-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet header field type: `packet_seq_num` field must be an unsigned integer field type: "
				"packet-seq-num-ft-addr=%p", field_type);
			goto invalid;
		}

		BT_PUT(field_type);
	}

	goto end;

invalid:
	is_valid = false;

end:
	bt_put(field_type);
	return is_valid;
}

static
bool packet_context_field_type_is_valid(struct bt_trace *trace,
		struct bt_stream_class *stream_class,
		struct bt_field_type *packet_context_type)
{
	bool is_valid = true;
	struct bt_field_type *field_type = NULL;

	if (!packet_context_type) {
		/* No packet context field type: valid at this point */
		goto end;
	}

	/* Packet context field type, if it exists, must be a structure */
	if (!bt_field_type_is_structure(packet_context_type)) {
		BT_LOGW("Invalid packet context field type: must be a structure field type if it exists: "
			"ft-addr=%p, ft-id=%s",
			packet_context_type,
			bt_field_type_id_string(packet_context_type->id));
		goto invalid;
	}

	/*
	 * If there's a `packet_size` field, it must be an unsigned
	 * integer field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_context_type, "packet_size");
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet context field type: `packet_size` field must be an integer field type: "
				"packet-size-ft-addr=%p, packet-size-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet context field type: `packet_size` field must be an unsigned integer field type: "
				"packet-size-ft-addr=%p", field_type);
			goto invalid;
		}

		BT_PUT(field_type);
	}

	/*
	 * If there's a `content_size` field, it must be an unsigned
	 * integer field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_context_type, "content_size");
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet context field type: `content_size` field must be an integer field type: "
				"content-size-ft-addr=%p, content-size-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet context field type: `content_size` field must be an unsigned integer field type: "
				"content-size-ft-addr=%p", field_type);
			goto invalid;
		}

		BT_PUT(field_type);
	}

	/*
	 * If there's a `events_discarded` field, it must be an unsigned
	 * integer field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_context_type, "events_discarded");
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet context field type: `events_discarded` field must be an integer field type: "
				"events-discarded-ft-addr=%p, events-discarded-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet context field type: `events_discarded` field must be an unsigned integer field type: "
				"events-discarded-ft-addr=%p", field_type);
			goto invalid;
		}

		BT_PUT(field_type);
	}

	/*
	 * If there's a `timestamp_begin` field, it must be an unsigned
	 * integer field type. Also, if the trace is not a CTF writer's
	 * trace, then we cannot automatically set the mapped clock
	 * class of this field, so it must have a mapped clock class.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_context_type, "timestamp_begin");
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet context field type: `timestamp_begin` field must be an integer field type: "
				"timestamp-begin-ft-addr=%p, timestamp-begin-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet context field type: `timestamp_begin` field must be an unsigned integer field type: "
				"timestamp-begin-ft-addr=%p", field_type);
			goto invalid;
		}

		if (!trace->is_created_by_writer) {
			struct bt_clock_class *clock_class =
				bt_field_type_integer_get_mapped_clock_class(
					field_type);

			bt_put(clock_class);
			if (!clock_class) {
				BT_LOGW("Invalid packet context field type: `timestamp_begin` field must be mapped to a clock class: "
					"timestamp-begin-ft-addr=%p", field_type);
				goto invalid;
			}
		}

		BT_PUT(field_type);
	}

	/*
	 * If there's a `timestamp_end` field, it must be an unsigned
	 * integer field type. Also, if the trace is not a CTF writer's
	 * trace, then we cannot automatically set the mapped clock
	 * class of this field, so it must have a mapped clock class.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		packet_context_type, "timestamp_end");
	if (field_type) {
		if (!bt_field_type_is_integer(field_type)) {
			BT_LOGW("Invalid packet context field type: `timestamp_end` field must be an integer field type: "
				"timestamp-end-ft-addr=%p, timestamp-end-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		if (bt_field_type_integer_is_signed(field_type)) {
			BT_LOGW("Invalid packet context field type: `timestamp_end` field must be an unsigned integer field type: "
				"timestamp-end-ft-addr=%p", field_type);
			goto invalid;
		}

		if (!trace->is_created_by_writer) {
			struct bt_clock_class *clock_class =
				bt_field_type_integer_get_mapped_clock_class(
					field_type);

			bt_put(clock_class);
			if (!clock_class) {
				BT_LOGW("Invalid packet context field type: `timestamp_end` field must be mapped to a clock class: "
					"timestamp-end-ft-addr=%p", field_type);
				goto invalid;
			}
		}

		BT_PUT(field_type);
	}

	goto end;

invalid:
	is_valid = false;

end:
	bt_put(field_type);
	return is_valid;
}

static
bool event_header_field_type_is_valid(struct bt_trace *trace,
		struct bt_stream_class *stream_class,
		struct bt_field_type *event_header_type)
{
	bool is_valid = true;
	struct bt_field_type *field_type = NULL;

	/*
	 * We do not validate that the `timestamp` field exists here
	 * because CTF does not require this exact name to be mapped to
	 * a clock class.
	 */

	if (!event_header_type) {
		/*
		 * No event header field type: stream class must have
		 * only one event class.
		 */
		if (bt_stream_class_get_event_class_count(stream_class) > 1) {
			BT_LOGW_STR("Invalid event header field type: "
				"event header field type does not exist but there's more than one event class in the stream class.");
			goto invalid;
		}

		/* No event header field type: valid at this point */
		goto end;
	}

	/* Event header field type, if it exists, must be a structure */
	if (!bt_field_type_is_structure(event_header_type)) {
		BT_LOGW("Invalid event header field type: must be a structure field type if it exists: "
			"ft-addr=%p, ft-id=%s",
			event_header_type,
			bt_field_type_id_string(event_header_type->id));
		goto invalid;
	}

	/*
	 * If there's an `id` field, it must be an unsigned integer
	 * field type or an enumeration field type with an unsigned
	 * integer container field type.
	 */
	field_type = bt_field_type_structure_get_field_type_by_name(
		event_header_type, "id");
	if (field_type) {
		struct bt_field_type *int_ft;

		if (bt_field_type_is_integer(field_type)) {
			int_ft = bt_get(field_type);
		} else if (bt_field_type_is_enumeration(field_type)) {
			int_ft = bt_field_type_enumeration_get_container_type(
				field_type);
		} else {
			BT_LOGW("Invalid event header field type: `id` field must be an integer or enumeration field type: "
				"id-ft-addr=%p, id-ft-id=%s",
				field_type,
				bt_field_type_id_string(field_type->id));
			goto invalid;
		}

		BT_ASSERT(int_ft);
		if (bt_field_type_integer_is_signed(int_ft)) {
			BT_LOGW("Invalid event header field type: `id` field must be an unsigned integer or enumeration field type: "
				"id-ft-addr=%p", int_ft);
			goto invalid;
		}

		bt_put(int_ft);
		BT_PUT(field_type);
	}

	goto end;

invalid:
	is_valid = false;

end:
	bt_put(field_type);
	return is_valid;
}

static
int check_packet_header_type_has_no_clock_class(struct bt_trace *trace)
{
	int ret = 0;

	if (trace->packet_header_type) {
		struct bt_clock_class *clock_class = NULL;

		ret = bt_validate_single_clock_class(trace->packet_header_type,
			&clock_class);
		bt_put(clock_class);
		if (ret || clock_class) {
			BT_LOGW("Trace's packet header field type cannot "
				"contain a field type which is mapped to "
				"a clock class: "
				"trace-addr=%p, trace-name=\"%s\", "
				"clock-class-name=\"%s\"",
				trace, bt_trace_get_name(trace),
				clock_class ?
					bt_clock_class_get_name(clock_class) :
					NULL);
			ret = -1;
		}
	}

	return ret;
}

int bt_trace_add_stream_class(struct bt_trace *trace,
		struct bt_stream_class *stream_class)
{
	int ret;
	int64_t i;
	int64_t stream_id;
	struct bt_validation_output trace_sc_validation_output = { 0 };
	struct bt_validation_output *ec_validation_outputs = NULL;
	const enum bt_validation_flag trace_sc_validation_flags =
		BT_VALIDATION_FLAG_TRACE |
		BT_VALIDATION_FLAG_STREAM;
	const enum bt_validation_flag ec_validation_flags =
		BT_VALIDATION_FLAG_EVENT;
	struct bt_field_type *packet_header_type = NULL;
	struct bt_field_type *packet_context_type = NULL;
	struct bt_field_type *event_header_type = NULL;
	struct bt_field_type *stream_event_ctx_type = NULL;
	int64_t event_class_count;
	struct bt_trace *current_parent_trace = NULL;
	struct bt_clock_class *expected_clock_class = NULL;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (!stream_class) {
		BT_LOGW_STR("Invalid parameter: stream class is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->is_static) {
		BT_LOGW_STR("Invalid parameter: trace is static.");
		ret = -1;
		goto end;
	}

	BT_LOGD("Adding stream class to trace: "
		"trace-addr=%p, trace-name=\"%s\", "
		"stream-class-addr=%p, stream-class-name=\"%s\", "
		"stream-class-id=%" PRId64,
		trace, bt_trace_get_name(trace),
		stream_class, bt_stream_class_get_name(stream_class),
		bt_stream_class_get_id(stream_class));

	current_parent_trace = bt_stream_class_get_trace(stream_class);
	if (current_parent_trace) {
		/* Stream class is already associated to a trace, abort. */
		BT_LOGW("Invalid parameter: stream class is already part of a trace: "
			"stream-class-trace-addr=%p, "
			"stream-class-trace-name=\"%s\"",
			current_parent_trace,
			bt_trace_get_name(current_parent_trace));
		ret = -1;
		goto end;
	}

	event_class_count =
		bt_stream_class_get_event_class_count(stream_class);
	BT_ASSERT(event_class_count >= 0);

	if (stream_class->clock) {
		struct bt_clock_class *stream_clock_class =
			stream_class->clock->clock_class;

		if (trace->is_created_by_writer) {
			/*
			 * Make sure this clock was also added to the
			 * trace (potentially through its CTF writer
			 * owner).
			 */
			size_t i;

			for (i = 0; i < trace->clocks->len; i++) {
				if (trace->clocks->pdata[i] ==
						stream_clock_class) {
					/* Found! */
					break;
				}
			}

			if (i == trace->clocks->len) {
				/* Not found */
				BT_LOGW("Stream class's clock's class is not part of the trace: "
					"clock-class-addr=%p, clock-class-name=\"%s\"",
					stream_clock_class,
					bt_clock_class_get_name(stream_clock_class));
				ret = -1;
				goto end;
			}
		} else {
			/*
			 * This trace was NOT created by a CTF writer,
			 * thus do not allow the stream class to add to
			 * have a clock at all. Those are two
			 * independent APIs (non-writer and writer
			 * APIs), and isolating them simplifies things.
			 */
			BT_LOGW("Cannot add stream class with a clock to a trace which was not created by a CTF writer object: "
				"clock-class-addr=%p, clock-class-name=\"%s\"",
				stream_clock_class,
				bt_clock_class_get_name(stream_clock_class));
			ret = -1;
			goto end;
		}

		if (stream_class->clock_class &&
				stream_class->clock_class !=
				stream_class->clock->clock_class) {
			/*
			 * Stream class already has an expected clock
			 * class, but it does not match its clock's
			 * class.
			 */
			BT_LOGW("Invalid parameter: stream class's clock's "
				"class does not match stream class's "
				"expected clock class: "
				"stream-class-addr=%p, "
				"stream-class-id=%" PRId64 ", "
				"stream-class-name=\"%s\", "
				"expected-clock-class-addr=%p, "
				"expected-clock-class-name=\"%s\"",
				stream_class,
				bt_stream_class_get_id(stream_class),
				bt_stream_class_get_name(stream_class),
				expected_clock_class,
				bt_clock_class_get_name(expected_clock_class));
		} else if (!stream_class->clock_class) {
			/*
			 * Set expected clock class to stream class's
			 * clock's class.
			 */
			expected_clock_class =
				bt_get(stream_class->clock->clock_class);
		}
	}

	if (!stream_class->frozen) {
		/*
		 * Stream class is not frozen yet. Validate that the
		 * stream class contains at most a single clock class
		 * because the previous
		 * bt_stream_class_add_event_class() calls did not make
		 * this validation since the stream class's direct field
		 * types (packet context, event header, event context)
		 * could change afterwards. This stream class is about
		 * to be frozen and those field types won't be changed
		 * if this function succeeds.
		 *
		 * At this point we're also sure that the stream class's
		 * clock, if any, has the same class as the stream
		 * class's expected clock class, if any. This is why, if
		 * bt_stream_class_validate_single_clock_class()
		 * succeeds below, the call to
		 * bt_stream_class_map_clock_class() at the end of this
		 * function is safe because it maps to the same, single
		 * clock class.
		 */
		ret = bt_stream_class_validate_single_clock_class(stream_class,
			&expected_clock_class);
		if (ret) {
			BT_LOGW("Invalid parameter: stream class or one of its "
				"event classes contains a field type which is "
				"not recursively mapped to the expected "
				"clock class: "
				"stream-class-addr=%p, "
				"stream-class-id=%" PRId64 ", "
				"stream-class-name=\"%s\", "
				"expected-clock-class-addr=%p, "
				"expected-clock-class-name=\"%s\"",
				stream_class, bt_stream_class_get_id(stream_class),
				bt_stream_class_get_name(stream_class),
				expected_clock_class,
				expected_clock_class ?
					bt_clock_class_get_name(expected_clock_class) :
					NULL);
			goto end;
		}
	}

	ret = check_packet_header_type_has_no_clock_class(trace);
	if (ret) {
		/* check_packet_header_type_has_no_clock_class() logs errors */
		goto end;
	}

	/*
	 * We're about to freeze both the trace and the stream class.
	 * Also, each event class contained in this stream class are
	 * already frozen.
	 *
	 * This trace, this stream class, and all its event classes
	 * should be valid at this point.
	 *
	 * Validate trace and stream class first, then each event
	 * class of this stream class can be validated individually.
	 */
	packet_header_type =
		bt_trace_get_packet_header_type(trace);
	packet_context_type =
		bt_stream_class_get_packet_context_type(stream_class);
	event_header_type =
		bt_stream_class_get_event_header_type(stream_class);
	stream_event_ctx_type =
		bt_stream_class_get_event_context_type(stream_class);

	BT_LOGD("Validating trace and stream class field types.");
	ret = bt_validate_class_types(trace->environment,
		packet_header_type, packet_context_type, event_header_type,
		stream_event_ctx_type, NULL, NULL, trace->valid,
		stream_class->valid, 1, &trace_sc_validation_output,
		trace_sc_validation_flags);
	BT_PUT(packet_header_type);
	BT_PUT(packet_context_type);
	BT_PUT(event_header_type);
	BT_PUT(stream_event_ctx_type);

	if (ret) {
		/*
		 * This means something went wrong during the validation
		 * process, not that the objects are invalid.
		 */
		BT_LOGE("Failed to validate trace and stream class field types: "
			"ret=%d", ret);
		goto end;
	}

	if ((trace_sc_validation_output.valid_flags &
			trace_sc_validation_flags) !=
			trace_sc_validation_flags) {
		/* Invalid trace/stream class */
		BT_LOGW("Invalid trace or stream class field types: "
			"valid-flags=0x%x",
			trace_sc_validation_output.valid_flags);
		ret = -1;
		goto end;
	}

	if (event_class_count > 0) {
		ec_validation_outputs = g_new0(struct bt_validation_output,
			event_class_count);
		if (!ec_validation_outputs) {
			BT_LOGE_STR("Failed to allocate one validation output structure.");
			ret = -1;
			goto end;
		}
	}

	/* Validate each event class individually */
	for (i = 0; i < event_class_count; i++) {
		struct bt_event_class *event_class =
			bt_stream_class_get_event_class_by_index(
				stream_class, i);
		struct bt_field_type *event_context_type = NULL;
		struct bt_field_type *event_payload_type = NULL;

		event_context_type =
			bt_event_class_get_context_type(event_class);
		event_payload_type =
			bt_event_class_get_payload_type(event_class);

		/*
		 * It is important to use the field types returned by
		 * the previous trace and stream class validation here
		 * because copies could have been made.
		 */
		BT_LOGD("Validating event class's field types: "
			"addr=%p, name=\"%s\", id=%" PRId64,
			event_class, bt_event_class_get_name(event_class),
			bt_event_class_get_id(event_class));
		ret = bt_validate_class_types(trace->environment,
			trace_sc_validation_output.packet_header_type,
			trace_sc_validation_output.packet_context_type,
			trace_sc_validation_output.event_header_type,
			trace_sc_validation_output.stream_event_ctx_type,
			event_context_type, event_payload_type,
			1, 1, event_class->valid, &ec_validation_outputs[i],
			ec_validation_flags);
		BT_PUT(event_context_type);
		BT_PUT(event_payload_type);
		BT_PUT(event_class);

		if (ret) {
			BT_LOGE("Failed to validate event class field types: "
				"ret=%d", ret);
			goto end;
		}

		if ((ec_validation_outputs[i].valid_flags &
				ec_validation_flags) != ec_validation_flags) {
			/* Invalid event class */
			BT_LOGW("Invalid event class field types: "
				"valid-flags=0x%x",
				ec_validation_outputs[i].valid_flags);
			ret = -1;
			goto end;
		}
	}

	stream_id = bt_stream_class_get_id(stream_class);
	if (stream_id < 0) {
		stream_id = trace->next_stream_id++;
		if (stream_id < 0) {
			BT_LOGE_STR("No more stream class IDs available.");
			ret = -1;
			goto end;
		}

		/* Try to assign a new stream id */
		for (i = 0; i < trace->stream_classes->len; i++) {
			if (stream_id == bt_stream_class_get_id(
				trace->stream_classes->pdata[i])) {
				/* Duplicate stream id found */
				BT_LOGW("Duplicate stream class ID: "
					"id=%" PRId64, (int64_t) stream_id);
				ret = -1;
				goto end;
			}
		}

		if (bt_stream_class_set_id_no_check(stream_class,
				stream_id)) {
			/* TODO Should retry with a different stream id */
			BT_LOGE("Cannot set stream class's ID: "
				"id=%" PRId64, (int64_t) stream_id);
			ret = -1;
			goto end;
		}
	}

	/*
	 * At this point all the field types in the validation output
	 * are valid. Validate the semantics of some scopes according to
	 * the CTF specification.
	 */
	if (!packet_header_field_type_is_valid(trace,
			trace_sc_validation_output.packet_header_type)) {
		BT_LOGW_STR("Invalid trace's packet header field type.");
		ret = -1;
		goto end;
	}

	if (!packet_context_field_type_is_valid(trace,
			stream_class,
			trace_sc_validation_output.packet_context_type)) {
		BT_LOGW_STR("Invalid stream class's packet context field type.");
		ret = -1;
		goto end;
	}

	if (!event_header_field_type_is_valid(trace,
			stream_class,
			trace_sc_validation_output.event_header_type)) {
		BT_LOGW_STR("Invalid steam class's event header field type.");
		ret = -1;
		goto end;
	}

	/*
	 * Now is the time to automatically map specific field types of
	 * the stream class's packet context and event header field
	 * types to the stream class's clock's class if they are not
	 * mapped to a clock class yet. We do it here because we know
	 * that after this point, everything is frozen so it won't be
	 * possible for the user to modify the stream class's clock, or
	 * to map those field types to other clock classes.
	 */
	if (trace->is_created_by_writer) {
		if (bt_stream_class_map_clock_class(stream_class,
				trace_sc_validation_output.packet_context_type,
				trace_sc_validation_output.event_header_type)) {
			BT_LOGW_STR("Cannot automatically map selected stream class's field types to stream class's clock's class.");
			ret = -1;
			goto end;
		}
	}

	bt_object_set_parent(stream_class, trace);
	g_ptr_array_add(trace->stream_classes, stream_class);

	/*
	 * At this point we know that the function will be successful.
	 * Therefore we can replace the trace and stream class field
	 * types with what's in their validation output structure and
	 * mark them as valid. We can also replace the field types of
	 * all the event classes of the stream class and mark them as
	 * valid.
	 */
	bt_validation_replace_types(trace, stream_class, NULL,
		&trace_sc_validation_output, trace_sc_validation_flags);
	trace->valid = 1;
	stream_class->valid = 1;

	/*
	 * Put what was not moved in bt_validation_replace_types().
	 */
	bt_validation_output_put_types(&trace_sc_validation_output);

	for (i = 0; i < event_class_count; i++) {
		struct bt_event_class *event_class =
			bt_stream_class_get_event_class_by_index(
				stream_class, i);

		bt_validation_replace_types(NULL, NULL, event_class,
			&ec_validation_outputs[i], ec_validation_flags);
		event_class->valid = 1;
		BT_PUT(event_class);

		/*
		 * Put what was not moved in
		 * bt_validation_replace_types().
		 */
		bt_validation_output_put_types(&ec_validation_outputs[i]);
	}

	/*
	 * Freeze the trace and the stream class.
	 */
	bt_stream_class_freeze(stream_class);
	bt_trace_freeze(trace);

	/*
	 * It is safe to set the stream class's unique clock class
	 * now because the stream class is frozen.
	 */
	if (expected_clock_class) {
		BT_MOVE(stream_class->clock_class, expected_clock_class);
	}

	/* Notifiy listeners of the trace's schema modification. */
	bt_stream_class_visit(stream_class,
			bt_trace_object_modification, trace);
	BT_LOGD("Added stream class to trace: "
		"trace-addr=%p, trace-name=\"%s\", "
		"stream-class-addr=%p, stream-class-name=\"%s\", "
		"stream-class-id=%" PRId64,
		trace, bt_trace_get_name(trace),
		stream_class, bt_stream_class_get_name(stream_class),
		bt_stream_class_get_id(stream_class));

end:
	if (ret) {
		bt_object_set_parent(stream_class, NULL);

		if (ec_validation_outputs) {
			for (i = 0; i < event_class_count; i++) {
				bt_validation_output_put_types(
					&ec_validation_outputs[i]);
			}
		}
	}

	g_free(ec_validation_outputs);
	bt_validation_output_put_types(&trace_sc_validation_output);
	bt_put(current_parent_trace);
	bt_put(expected_clock_class);
	BT_ASSERT(!packet_header_type);
	BT_ASSERT(!packet_context_type);
	BT_ASSERT(!event_header_type);
	BT_ASSERT(!stream_event_ctx_type);
	return ret;
}

int64_t bt_trace_get_stream_count(struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return (int64_t) trace->streams->len;
}

struct bt_stream *bt_trace_get_stream_by_index(
		struct bt_trace *trace,
		uint64_t index)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	BT_ASSERT_PRE(index < trace->streams->len,
		"Index is out of bounds: index=%" PRIu64 ", "
		"count=%u",
		index, trace->streams->len);
	return bt_get(g_ptr_array_index(trace->streams, index));
}

int64_t bt_trace_get_stream_class_count(struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return (int64_t) trace->stream_classes->len;
}

struct bt_stream_class *bt_trace_get_stream_class_by_index(
		struct bt_trace *trace, uint64_t index)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	BT_ASSERT_PRE(index < trace->stream_classes->len,
		"Index is out of bounds: index=%" PRIu64 ", "
		"count=%u",
		index, trace->stream_classes->len);
	return bt_get(g_ptr_array_index(trace->stream_classes, index));
}

struct bt_stream_class *bt_trace_get_stream_class_by_id(
		struct bt_trace *trace, uint64_t id_param)
{
	int i;
	struct bt_stream_class *stream_class = NULL;
	int64_t id = (int64_t) id_param;

	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	BT_ASSERT_PRE(id >= 0,
		"Invalid stream class ID: %" PRIu64, id_param);

	for (i = 0; i < trace->stream_classes->len; i++) {
		struct bt_stream_class *stream_class_candidate;

		stream_class_candidate =
			g_ptr_array_index(trace->stream_classes, i);

		if (bt_stream_class_get_id(stream_class_candidate) ==
				(int64_t) id) {
			stream_class = stream_class_candidate;
			bt_get(stream_class);
			goto end;
		}
	}

end:
	return stream_class;
}

struct bt_clock_class *bt_trace_get_clock_class_by_name(
		struct bt_trace *trace, const char *name)
{
	size_t i;
	struct bt_clock_class *clock_class = NULL;

	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	BT_ASSERT_PRE_NON_NULL(name, "Name");

	for (i = 0; i < trace->clocks->len; i++) {
		struct bt_clock_class *cur_clk =
			g_ptr_array_index(trace->clocks, i);
		const char *cur_clk_name = bt_clock_class_get_name(cur_clk);

		if (!cur_clk_name) {
			goto end;
		}

		if (!strcmp(cur_clk_name, name)) {
			clock_class = cur_clk;
			bt_get(clock_class);
			goto end;
		}
	}

end:
	return clock_class;
}

BT_HIDDEN
bt_bool bt_trace_has_clock_class(struct bt_trace *trace,
		struct bt_clock_class *clock_class)
{
	struct search_query query = { .value = clock_class, .found = 0 };

	BT_ASSERT(trace);
	BT_ASSERT(clock_class);

	g_ptr_array_foreach(trace->clocks, value_exists, &query);
	return query.found;
}

BT_HIDDEN
const char *get_byte_order_string(enum bt_byte_order byte_order)
{
	const char *string;

	switch (byte_order) {
	case BT_BYTE_ORDER_LITTLE_ENDIAN:
		string = "le";
		break;
	case BT_BYTE_ORDER_BIG_ENDIAN:
		string = "be";
		break;
	case BT_BYTE_ORDER_NATIVE:
		string = "native";
		break;
	default:
		abort();
	}

	return string;
}

static
int append_trace_metadata(struct bt_trace *trace,
		struct metadata_context *context)
{
	unsigned char *uuid = trace->uuid;
	int ret = 0;

	if (trace->native_byte_order == BT_BYTE_ORDER_NATIVE ||
			trace->native_byte_order == BT_BYTE_ORDER_UNSPECIFIED) {
		BT_LOGW("Invalid parameter: trace's byte order cannot be BT_BYTE_ORDER_NATIVE or BT_BYTE_ORDER_UNSPECIFIED at this point; "
			"set it with bt_trace_set_native_byte_order(): "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	g_string_append(context->string, "trace {\n");
	g_string_append(context->string, "\tmajor = 1;\n");
	g_string_append(context->string, "\tminor = 8;\n");
	BT_ASSERT(trace->native_byte_order == BT_BYTE_ORDER_LITTLE_ENDIAN ||
		trace->native_byte_order == BT_BYTE_ORDER_BIG_ENDIAN ||
		trace->native_byte_order == BT_BYTE_ORDER_NETWORK);

	if (trace->uuid_set) {
		g_string_append_printf(context->string,
			"\tuuid = \"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\";\n",
			uuid[0], uuid[1], uuid[2], uuid[3],
			uuid[4], uuid[5], uuid[6], uuid[7],
			uuid[8], uuid[9], uuid[10], uuid[11],
			uuid[12], uuid[13], uuid[14], uuid[15]);
	}

	g_string_append_printf(context->string, "\tbyte_order = %s;\n",
		get_byte_order_string(trace->native_byte_order));

	if (trace->packet_header_type) {
		g_string_append(context->string, "\tpacket.header := ");
		context->current_indentation_level++;
		g_string_assign(context->field_name, "");
		BT_LOGD_STR("Serializing trace's packet header field type's metadata.");
		ret = bt_field_type_serialize(trace->packet_header_type,
			context);
		if (ret) {
			goto end;
		}
		context->current_indentation_level--;
	}

	g_string_append(context->string, ";\n};\n\n");
end:
	return ret;
}

static
void append_env_metadata(struct bt_trace *trace,
		struct metadata_context *context)
{
	int64_t i;
	int64_t env_size;

	env_size = bt_attributes_get_count(trace->environment);
	if (env_size <= 0) {
		return;
	}

	g_string_append(context->string, "env {\n");

	for (i = 0; i < env_size; i++) {
		struct bt_value *env_field_value_obj = NULL;
		const char *entry_name;

		entry_name = bt_attributes_get_field_name(
			trace->environment, i);
		env_field_value_obj = bt_attributes_get_field_value(
			trace->environment, i);

		BT_ASSERT(entry_name);
		BT_ASSERT(env_field_value_obj);

		switch (bt_value_get_type(env_field_value_obj)) {
		case BT_VALUE_TYPE_INTEGER:
		{
			int ret;
			int64_t int_value;

			ret = bt_value_integer_get(env_field_value_obj,
				&int_value);
			BT_ASSERT(ret == 0);
			g_string_append_printf(context->string,
				"\t%s = %" PRId64 ";\n", entry_name,
				int_value);
			break;
		}
		case BT_VALUE_TYPE_STRING:
		{
			int ret;
			const char *str_value;
			char *escaped_str = NULL;

			ret = bt_value_string_get(env_field_value_obj,
				&str_value);
			BT_ASSERT(ret == 0);
			escaped_str = g_strescape(str_value, NULL);
			if (!escaped_str) {
				BT_LOGE("Cannot escape string: string=\"%s\"",
					str_value);
				goto loop_next;
			}

			g_string_append_printf(context->string,
				"\t%s = \"%s\";\n", entry_name, escaped_str);
			free(escaped_str);
			break;
		}
		default:
			goto loop_next;
		}

loop_next:
		BT_PUT(env_field_value_obj);
	}

	g_string_append(context->string, "};\n\n");
}

char *bt_trace_get_metadata_string(struct bt_trace *trace)
{
	char *metadata = NULL;
	struct metadata_context *context = NULL;
	int err = 0;
	size_t i;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		goto end;
	}

	context = g_new0(struct metadata_context, 1);
	if (!context) {
		BT_LOGE_STR("Failed to allocate one metadata context.");
		goto end;
	}

	context->field_name = g_string_sized_new(DEFAULT_IDENTIFIER_SIZE);
	context->string = g_string_sized_new(DEFAULT_METADATA_STRING_SIZE);
	g_string_append(context->string, "/* CTF 1.8 */\n\n");
	if (append_trace_metadata(trace, context)) {
		/* append_trace_metadata() logs errors */
		goto error;
	}
	append_env_metadata(trace, context);
	g_ptr_array_foreach(trace->clocks,
		(GFunc)bt_clock_class_serialize, context);

	for (i = 0; i < trace->stream_classes->len; i++) {
		/* bt_stream_class_serialize() logs details */
		err = bt_stream_class_serialize(
			trace->stream_classes->pdata[i], context);
		if (err) {
			/* bt_stream_class_serialize() logs errors */
			goto error;
		}
	}

	metadata = context->string->str;

error:
	g_string_free(context->string, err ? TRUE : FALSE);
	g_string_free(context->field_name, TRUE);
	g_free(context);

end:
	return metadata;
}

enum bt_byte_order bt_trace_get_native_byte_order(
		struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return trace->native_byte_order;
}

int bt_trace_set_native_byte_order(struct bt_trace *trace,
		enum bt_byte_order byte_order)
{
	int ret = 0;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->frozen) {
		BT_LOGW("Invalid parameter: trace is frozen: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	if (trace->is_created_by_writer &&
			byte_order == BT_BYTE_ORDER_UNSPECIFIED) {
		BT_LOGW("Invalid parameter: BT_BYTE_ORDER_UNSPECIFIED byte order is not allowed for a CTF writer trace: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	if (byte_order != BT_BYTE_ORDER_LITTLE_ENDIAN &&
			byte_order != BT_BYTE_ORDER_BIG_ENDIAN &&
			byte_order != BT_BYTE_ORDER_NETWORK) {
		BT_LOGW("Invalid parameter: invalid byte order: "
			"addr=%p, name=\"%s\", bo=%s",
			trace, bt_trace_get_name(trace),
			bt_byte_order_string(byte_order));
		ret = -1;
		goto end;
	}

	trace->native_byte_order = byte_order;
	BT_LOGV("Set trace's native byte order: "
		"addr=%p, name=\"%s\", bo=%s",
		trace, bt_trace_get_name(trace),
		bt_byte_order_string(byte_order));

end:
	return ret;
}

struct bt_field_type *bt_trace_get_packet_header_type(
		struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return bt_get(trace->packet_header_type);
}

int bt_trace_set_packet_header_type(struct bt_trace *trace,
		struct bt_field_type *packet_header_type)
{
	int ret = 0;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->frozen) {
		BT_LOGW("Invalid parameter: trace is frozen: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		ret = -1;
		goto end;
	}

	/* packet_header_type must be a structure. */
	if (packet_header_type &&
			!bt_field_type_is_structure(packet_header_type)) {
		BT_LOGW("Invalid parameter: packet header field type must be a structure field type if it exists: "
			"addr=%p, name=\"%s\", ft-addr=%p, ft-id=%s",
			trace, bt_trace_get_name(trace),
			packet_header_type,
			bt_field_type_id_string(packet_header_type->id));
		ret = -1;
		goto end;
	}

	bt_put(trace->packet_header_type);
	trace->packet_header_type = bt_get(packet_header_type);
	BT_LOGV("Set trace's packet header field type: "
		"addr=%p, name=\"%s\", packet-context-ft-addr=%p",
		trace, bt_trace_get_name(trace), packet_header_type);
end:
	return ret;
}

static
int64_t get_stream_class_count(void *element)
{
	return bt_trace_get_stream_class_count(
			(struct bt_trace *) element);
}

static
void *get_stream_class(void *element, int i)
{
	return bt_trace_get_stream_class_by_index(
			(struct bt_trace *) element, i);
}

static
int visit_stream_class(void *object, bt_visitor visitor,void *data)
{
	return bt_stream_class_visit(object, visitor, data);
}

int bt_trace_visit(struct bt_trace *trace,
		bt_visitor visitor, void *data)
{
	int ret;
	struct bt_visitor_object obj = {
		.object = trace,
		.type = BT_VISITOR_OBJECT_TYPE_TRACE
	};

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (!visitor) {
		BT_LOGW_STR("Invalid parameter: visitor is NULL.");
		ret = -1;
		goto end;
	}

	BT_LOGV("Visiting trace: addr=%p, name=\"%s\"",
		trace, bt_trace_get_name(trace));
	ret = visitor_helper(&obj, get_stream_class_count,
			get_stream_class, visit_stream_class, visitor, data);
end:
	return ret;
}

static
int invoke_listener(struct bt_visitor_object *object, void *data)
{
	struct listener_wrapper *listener_wrapper = data;

	listener_wrapper->listener(object, listener_wrapper->data);
	return 0;
}

// TODO: add logging to this function once we use it internally.
int bt_trace_add_listener(struct bt_trace *trace,
		bt_listener_cb listener, void *listener_data)
{
	int ret = 0;
	struct listener_wrapper *listener_wrapper =
			g_new0(struct listener_wrapper, 1);

	if (!trace || !listener || !listener_wrapper) {
		ret = -1;
		goto error;
	}

	listener_wrapper->listener = listener;
	listener_wrapper->data = listener_data;

	/* Visit the current schema. */
	ret = bt_trace_visit(trace, invoke_listener, listener_wrapper);
	if (ret) {
		goto error;
	}

	/*
	 * Add listener to the array of callbacks which will be invoked on
	 * schema changes.
	 */
	g_ptr_array_add(trace->listeners, listener_wrapper);
	return ret;
error:
	g_free(listener_wrapper);
	return ret;
}

BT_HIDDEN
int bt_trace_object_modification(struct bt_visitor_object *object,
		void *trace_ptr)
{
	size_t i;
	struct bt_trace *trace = trace_ptr;

	BT_ASSERT(trace);
	BT_ASSERT(object);

	if (trace->listeners->len == 0) {
		goto end;
	}

	for (i = 0; i < trace->listeners->len; i++) {
		struct listener_wrapper *listener =
				g_ptr_array_index(trace->listeners, i);

		listener->listener(object, listener->data);
	}
end:
	return 0;
}

BT_HIDDEN
struct bt_field_type *get_field_type(enum field_type_alias alias)
{
	int ret;
	unsigned int alignment, size;
	struct bt_field_type *field_type = NULL;

	if (alias >= NR_FIELD_TYPE_ALIAS) {
		goto end;
	}

	alignment = field_type_aliases_alignments[alias];
	size = field_type_aliases_sizes[alias];
	field_type = bt_field_type_integer_create(size);
	ret = bt_field_type_set_alignment(field_type, alignment);
	if (ret) {
		BT_PUT(field_type);
	}
end:
	return field_type;
}

static
void bt_trace_freeze(struct bt_trace *trace)
{
	int i;

	if (trace->frozen) {
		return;
	}

	BT_LOGD("Freezing trace: addr=%p, name=\"%s\"",
		trace, bt_trace_get_name(trace));
	BT_LOGD_STR("Freezing packet header field type.");
	bt_field_type_freeze(trace->packet_header_type);
	BT_LOGD_STR("Freezing environment attributes.");
	bt_attributes_freeze(trace->environment);

	if (trace->clocks->len > 0) {
		BT_LOGD_STR("Freezing clock classes.");
	}

	for (i = 0; i < trace->clocks->len; i++) {
		struct bt_clock_class *clock_class =
			g_ptr_array_index(trace->clocks, i);

		bt_clock_class_freeze(clock_class);
	}

	trace->frozen = 1;
}

bt_bool bt_trace_is_static(struct bt_trace *trace)
{
	BT_ASSERT_PRE_NON_NULL(trace, "Trace");
	return trace->is_static;
}

int bt_trace_set_is_static(struct bt_trace *trace)
{
	int ret = 0;
	size_t i;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	ret = check_packet_header_type_has_no_clock_class(trace);
	if (ret) {
		/* check_packet_header_type_has_no_clock_class() logs errors */
		goto end;
	}

	trace->is_static = BT_TRUE;
	bt_trace_freeze(trace);
	BT_LOGV("Set trace static: addr=%p, name=\"%s\"",
		trace, bt_trace_get_name(trace));

	/* Call all the "trace is static" listeners */
	for (i = 0; i < trace->is_static_listeners->len; i++) {
		struct bt_trace_is_static_listener_elem elem =
			g_array_index(trace->is_static_listeners,
				struct bt_trace_is_static_listener_elem, i);

		if (elem.func) {
			elem.func(trace, elem.data);
		}
	}

end:
	return ret;
}

int bt_trace_add_is_static_listener(struct bt_trace *trace,
		bt_trace_is_static_listener listener,
		bt_trace_listener_removed listener_removed, void *data)
{
	int i;
	struct bt_trace_is_static_listener_elem new_elem = {
		.func = listener,
		.removed = listener_removed,
		.data = data,
	};

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		i = -1;
		goto end;
	}

	if (!listener) {
		BT_LOGW_STR("Invalid parameter: listener is NULL.");
		i = -1;
		goto end;
	}

	if (trace->is_static) {
		BT_LOGW("Invalid parameter: trace is already static: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		i = -1;
		goto end;
	}

	if (trace->in_remove_listener) {
		BT_LOGW("Cannot call this function during the execution of a remove listener: "
			"addr=%p, name=\"%s\"",
			trace, bt_trace_get_name(trace));
		i = -1;
		goto end;
	}

	/* Find the next available spot */
	for (i = 0; i < trace->is_static_listeners->len; i++) {
		struct bt_trace_is_static_listener_elem elem =
			g_array_index(trace->is_static_listeners,
				struct bt_trace_is_static_listener_elem, i);

		if (!elem.func) {
			break;
		}
	}

	if (i == trace->is_static_listeners->len) {
		g_array_append_val(trace->is_static_listeners, new_elem);
	} else {
		g_array_insert_val(trace->is_static_listeners, i, new_elem);
	}

	BT_LOGV("Added \"trace is static\" listener: "
		"trace-addr=%p, trace-name=\"%s\", func-addr=%p, "
		"data-addr=%p, listener-id=%d",
		trace, bt_trace_get_name(trace), listener, data, i);

end:
	return i;
}

int bt_trace_remove_is_static_listener(
		struct bt_trace *trace, int listener_id)
{
	int ret = 0;
	struct bt_trace_is_static_listener_elem *elem;

	if (!trace) {
		BT_LOGW_STR("Invalid parameter: trace is NULL.");
		ret = -1;
		goto end;
	}

	if (trace->in_remove_listener) {
		BT_LOGW("Cannot call this function during the execution of a remove listener: "
			"addr=%p, name=\"%s\", listener-id=%d",
			trace, bt_trace_get_name(trace),
			listener_id);
		ret = -1;
		goto end;
	}

	if (listener_id < 0) {
		BT_LOGW("Invalid listener ID: must be zero or positive: "
			"listener-id=%d", listener_id);
		ret = -1;
		goto end;
	}

	if (listener_id >= trace->is_static_listeners->len) {
		BT_LOGW("Invalid parameter: no listener with this listener ID: "
			"addr=%p, name=\"%s\", listener-id=%d",
			trace, bt_trace_get_name(trace),
			listener_id);
		ret = -1;
		goto end;
	}

	elem = &g_array_index(trace->is_static_listeners,
			struct bt_trace_is_static_listener_elem,
			listener_id);
	if (!elem->func) {
		BT_LOGW("Invalid parameter: no listener with this listener ID: "
			"addr=%p, name=\"%s\", listener-id=%d",
			trace, bt_trace_get_name(trace),
			listener_id);
		ret = -1;
		goto end;
	}

	if (elem->removed) {
		/* Call remove listener */
		BT_LOGV("Calling remove listener: "
			"trace-addr=%p, trace-name=\"%s\", "
			"listener-id=%d", trace, bt_trace_get_name(trace),
			listener_id);
		trace->in_remove_listener = BT_TRUE;
		elem->removed(trace, elem->data);
		trace->in_remove_listener = BT_FALSE;
	}

	elem->func = NULL;
	elem->removed = NULL;
	elem->data = NULL;
	BT_LOGV("Removed \"trace is static\" listener: "
		"trace-addr=%p, trace-name=\"%s\", "
		"listener-id=%d", trace, bt_trace_get_name(trace),
		listener_id);

end:
	return ret;
}