lib: merge common CTF IR part with the remaining implementation
[babeltrace.git] / lib / ctf-ir / packet.c
index 1bc5a0890e41cbe7d071eeeda2ddd580650287bf..43506ef8c1bc54404c5e67e178ed611b2771cfeb 100644 (file)
@@ -31,6 +31,7 @@
 #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>
@@ -48,129 +49,211 @@ struct bt_stream *bt_packet_borrow_stream(struct bt_packet *packet)
        return packet->stream;
 }
 
-struct bt_field *bt_packet_borrow_header(
-               struct bt_packet *packet)
+struct bt_field *bt_packet_borrow_header(struct bt_packet *packet)
 {
        BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       return packet->header;
+       return packet->header ? (void *) packet->header->field : NULL;
 }
 
-BT_ASSERT_PRE_FUNC
-static inline bool validate_field_to_set(struct bt_field *field,
-               struct bt_field_type_common *expected_ft)
+struct bt_field *bt_packet_borrow_context(struct bt_packet *packet)
 {
-       bool ret = true;
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       return packet->context ? (void *) packet->context->field : NULL;
+}
 
-       if (!field) {
-               if (expected_ft) {
-                       BT_ASSERT_PRE_MSG("Setting no field, but expected "
-                               "field type is not NULL: "
-                               "%![field-]+f, %![expected-ft-]+F",
-                               field, expected_ft);
-                       ret = false;
-                       goto end;
-               }
+BT_HIDDEN
+void _bt_packet_set_is_frozen(struct bt_packet *packet, bool is_frozen)
+{
+       if (!packet) {
+               return;
+       }
 
-               goto end;
+       BT_LOGD("Setting packet's frozen state: addr=%p, frozen=%d",
+               packet, is_frozen);
+
+       if (packet->header) {
+               BT_LOGD("Setting packet's header field's frozen state: "
+                       "frozen=%d", is_frozen);
+               bt_field_set_is_frozen_recursive((void *) packet->header->field,
+                       is_frozen);
        }
 
-       if (bt_field_type_compare(bt_field_borrow_type(field),
-                       BT_FROM_COMMON(expected_ft)) != 0) {
-               BT_ASSERT_PRE_MSG("Field type is different from expected "
-                       " field type: %![field-ft-]+F, %![expected-ft-]+F",
-                       bt_field_borrow_type(field), expected_ft);
-               ret = false;
-               goto end;
+       if (packet->context) {
+               BT_LOGD("Setting packet's context field's frozen state: "
+                       "frozen=%d", is_frozen);
+               bt_field_set_is_frozen_recursive((void *) packet->context->field,
+                       is_frozen);
        }
 
-end:
-       return ret;
+       packet->frozen = is_frozen;
 }
 
-int bt_packet_set_header(struct bt_packet *packet,
-               struct bt_field *header)
+static inline
+void bt_packet_reset_avail(struct bt_packet *packet)
 {
-       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       BT_ASSERT_PRE_HOT(packet, "Packet", ": +%!+a", packet);
-       BT_ASSERT_PRE(validate_field_to_set(header,
-               bt_stream_class_borrow_trace(
-                       BT_FROM_COMMON(packet->stream->common.stream_class))->common.packet_header_field_type),
-               "Invalid packet header field: "
-               "%![packet-]+a, %![field-]+f", packet, header);
-       bt_put(packet->header);
-       packet->header = bt_get(header);
-       BT_LOGV("Set packet's header field: packet-addr=%p, packet-header-addr=%p",
-               packet, header);
-       return 0;
+       /* Previous packet */
+       packet->prev_packet_info.avail =
+               BT_PACKET_PREVIOUS_PACKET_AVAILABILITY_NOT_AVAILABLE;
+       packet->prev_packet_info.discarded_event_counter.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       packet->prev_packet_info.seq_num.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       packet->prev_packet_info.default_end_cv.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+
+       /* Current packet */
+       packet->discarded_event_counter.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       packet->seq_num.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+
+       /* Computed */
+       packet->discarded_event_count.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       packet->discarded_packet_count.avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
 }
 
-struct bt_field *bt_packet_borrow_context(struct bt_packet *packet)
+static inline
+void bt_packet_reset(struct bt_packet *packet)
 {
-       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       return packet->context;
+       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);
+       }
+
+       bt_clock_value_set_reset(&packet->begin_cv_set);
+       bt_clock_value_set_reset(&packet->end_cv_set);
+       bt_packet_reset_avail(packet);
+       bt_packet_invalidate_properties(packet);
+
+       if (packet->prev_packet_info.default_end_cv.cv) {
+               bt_clock_value_recycle(packet->prev_packet_info.default_end_cv.cv);
+               packet->prev_packet_info.default_end_cv.cv = NULL;
+       }
 }
 
-int bt_packet_set_context(struct bt_packet *packet,
-               struct bt_field *context)
+static
+void bt_packet_header_field_recycle(struct bt_field_wrapper *header_field,
+               struct bt_trace *trace)
 {
-       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       BT_ASSERT_PRE_HOT(packet, "Packet", ": +%!+a", packet);
-       BT_ASSERT_PRE(validate_field_to_set(context,
-               BT_FROM_COMMON(packet->stream->common.stream_class->packet_context_field_type)),
-               "Invalid packet context field: "
-               "%![packet-]+a, %![field-]+f", packet, context);
-       bt_put(packet->context);
-       packet->context = bt_get(context);
-       BT_LOGV("Set packet's context field: packet-addr=%p, packet-context-addr=%p",
-               packet, context);
-       return 0;
+       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_freeze(struct bt_packet *packet)
+void bt_packet_recycle(struct bt_packet *packet)
 {
-       if (!packet || packet->frozen) {
-               return;
-       }
+       struct bt_stream *stream;
+
+       BT_ASSERT(packet);
+       BT_LIB_LOGD("Recycling packet: %!+a", packet);
 
-       BT_LOGD("Freezing packet: addr=%p", packet);
-       BT_LOGD_STR("Freezing packet's header field.");
-       bt_field_freeze_recursive(packet->header);
-       BT_LOGD_STR("Freezing packet's context field.");
-       bt_field_freeze_recursive(packet->context);
-       packet->frozen = 1;
+       /*
+        * 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->base);
 }
 
-static
-void bt_packet_destroy(struct bt_object *obj)
+BT_HIDDEN
+void bt_packet_destroy(struct bt_packet *packet)
 {
-       struct bt_packet *packet = (void *) obj;
-
        BT_LOGD("Destroying packet: addr=%p", packet);
-       BT_LOGD_STR("Putting packet's header field.");
-       bt_put(packet->header);
-       BT_LOGD_STR("Putting packet's context field.");
-       bt_put(packet->context);
+       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_clock_value_set_finalize(&packet->begin_cv_set);
+       bt_clock_value_set_finalize(&packet->end_cv_set);
        BT_LOGD_STR("Putting packet's stream.");
        bt_put(packet->stream);
        g_free(packet);
 }
 
-struct bt_packet *bt_packet_create(
-               struct bt_stream *stream)
+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_PRE_NON_NULL(stream, "Stream");
+       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->stream_class,
+               bt_stream_class_get_name(stream->stream_class),
+               bt_stream_class_get_id(stream->stream_class));
        stream_class = bt_stream_borrow_class(stream);
        BT_ASSERT(stream_class);
        trace = bt_stream_class_borrow_trace(stream_class);
@@ -181,35 +264,427 @@ struct bt_packet *bt_packet_create(
                goto end;
        }
 
-       bt_object_init(packet, bt_packet_destroy);
+       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) {
+       if (trace->packet_header_field_type) {
                BT_LOGD("Creating initial packet header field: ft-addr=%p",
-                       trace->common.packet_header_field_type);
-               packet->header = bt_field_create(
-                       BT_FROM_COMMON(trace->common.packet_header_field_type));
+                       trace->packet_header_field_type);
+               packet->header = bt_field_wrapper_create(
+                       &trace->packet_header_field_pool,
+                       (void *) trace->packet_header_field_type);
                if (!packet->header) {
-                       BT_LOGE_STR("Cannot create initial packet header field object.");
+                       BT_LOGE("Cannot create packet header field wrapper.");
                        BT_PUT(packet);
                        goto end;
                }
        }
 
-       if (stream->common.stream_class->packet_context_field_type) {
+       if (stream->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_create(
-                       BT_FROM_COMMON(stream->common.stream_class->packet_context_field_type));
+                       stream->stream_class->packet_context_field_type);
+               packet->context = bt_field_wrapper_create(
+                       &stream_class->packet_context_field_pool,
+                       (void *) stream->stream_class->packet_context_field_type);
                if (!packet->context) {
-                       BT_LOGE_STR("Cannot create initial packet header field object.");
+                       BT_LOGE("Cannot create packet context field wrapper.");
                        BT_PUT(packet);
                        goto end;
                }
        }
 
+       if (bt_clock_value_set_initialize(&packet->begin_cv_set)) {
+               BT_PUT(packet);
+               goto end;
+       }
+
+       if (bt_clock_value_set_initialize(&packet->end_cv_set)) {
+               BT_PUT(packet);
+               goto end;
+       }
+
+       bt_packet_reset_avail(packet);
        BT_LOGD("Created packet object: addr=%p", packet);
 
 end:
        return packet;
 }
+
+static inline
+uint64_t get_uint_field_value(struct bt_field *parent_field, const char *name)
+{
+       uint64_t val = UINT64_C(-1);
+       struct bt_field *field = bt_field_structure_borrow_field_by_name(
+               parent_field, name);
+       int ret;
+
+       if (!field) {
+               goto end;
+       }
+
+       BT_ASSERT(bt_field_is_integer(field));
+       BT_ASSERT(!bt_field_type_integer_is_signed(
+               bt_field_borrow_type(field)));
+       ret = bt_field_integer_unsigned_get_value(field, &val);
+       BT_ASSERT(ret == 0);
+
+end:
+       return val;
+}
+
+static inline
+void set_packet_prop_uint64(struct bt_packet_prop_uint64 *prop, uint64_t val)
+{
+       BT_ASSERT(prop);
+       prop->value = val;
+       prop->avail = BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE;
+}
+
+static inline
+int set_packet_default_clock_value(struct bt_field *pkt_ctx_field,
+               const char *field_name, struct bt_clock_value_set *cv_set)
+{
+       int ret = 0;
+       uint64_t val = UINT64_C(-1);
+       struct bt_field *field = bt_field_structure_borrow_field_by_name(
+               pkt_ctx_field, field_name);
+       struct bt_clock_class *clock_class;
+
+       if (!field) {
+               goto end;
+       }
+
+       BT_ASSERT(bt_field_is_integer(field));
+       BT_ASSERT(!bt_field_type_integer_is_signed(
+               bt_field_borrow_type(field)));
+       clock_class = bt_field_type_integer_borrow_mapped_clock_class(
+               bt_field_borrow_type(field));
+       if (!clock_class) {
+               goto end;
+       }
+
+       ret = bt_field_integer_unsigned_get_value(field, &val);
+       BT_ASSERT(ret == 0);
+       ret = bt_clock_value_set_set_clock_value(cv_set, clock_class,
+               val, true);
+
+end:
+       return ret;
+}
+
+BT_HIDDEN
+int bt_packet_set_properties(struct bt_packet *packet)
+{
+       struct bt_field *pkt_context_field;
+       uint64_t val;
+       int ret = 0;
+
+       BT_ASSERT(!packet->props_are_set);
+
+       pkt_context_field = bt_packet_borrow_context(packet);
+       if (!pkt_context_field) {
+               goto end;
+       }
+
+       /* Discarded event counter */
+       val = get_uint_field_value(pkt_context_field, "events_discarded");
+       if (val != UINT64_C(-1)) {
+               set_packet_prop_uint64(&packet->discarded_event_counter, val);
+       }
+
+       /* Sequence number */
+       val = get_uint_field_value(pkt_context_field, "packet_seq_num");
+       if (val != UINT64_C(-1)) {
+               set_packet_prop_uint64(&packet->seq_num, val);
+       }
+
+       /* Beginning and end times */
+       ret = set_packet_default_clock_value(pkt_context_field,
+               "timestamp_begin", &packet->begin_cv_set);
+       if (ret) {
+               goto end;
+       }
+
+       ret = set_packet_default_clock_value(pkt_context_field,
+               "timestamp_end", &packet->end_cv_set);
+       if (ret) {
+               goto end;
+       }
+
+       /* Information from previous packet */
+       if (packet->prev_packet_info.avail ==
+                       BT_PACKET_PREVIOUS_PACKET_AVAILABILITY_AVAILABLE) {
+               /* Discarded event count */
+               if (packet->prev_packet_info.discarded_event_counter.avail ==
+                               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE) {
+                       BT_ASSERT(packet->discarded_event_counter.avail ==
+                               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE);
+                       set_packet_prop_uint64(&packet->discarded_event_count,
+                               packet->discarded_event_counter.value -
+                               packet->prev_packet_info.discarded_event_counter.value);
+               }
+
+               /* Discarded packet count */
+               if (packet->prev_packet_info.seq_num.avail ==
+                               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE) {
+                       BT_ASSERT(packet->seq_num.avail ==
+                               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE);
+                       set_packet_prop_uint64(&packet->discarded_packet_count,
+                               packet->seq_num.value -
+                               packet->prev_packet_info.seq_num.value - 1);
+               }
+       }
+
+end:
+       return ret;
+}
+
+static
+int snapshot_prev_packet_properties(struct bt_packet *packet,
+               enum bt_packet_previous_packet_availability prev_packet_avail,
+               struct bt_packet *prev_packet)
+{
+       int ret = 0;
+       struct bt_clock_value *prev_packet_default_end_cv;
+
+       if (!prev_packet) {
+               goto end;
+       }
+
+       if (!prev_packet->props_are_set) {
+               ret = bt_packet_set_properties(prev_packet);
+               if (ret) {
+                       BT_LIB_LOGE("Cannot update previous packet's properties: "
+                               "%![prev-packet-]+a", prev_packet);
+                       goto end;
+               }
+       }
+
+       packet->prev_packet_info.avail = prev_packet_avail;
+       prev_packet_default_end_cv = prev_packet->end_cv_set.default_cv;
+
+       /* End time */
+       if (prev_packet_default_end_cv) {
+               /* Copy clock value */
+               packet->prev_packet_info.default_end_cv.cv =
+                       bt_clock_value_create(
+                               prev_packet_default_end_cv->clock_class);
+               if (!packet->prev_packet_info.default_end_cv.cv) {
+                       BT_LIB_LOGE("Cannot create a clock value from a clock class: "
+                               "%![cc-]+K",
+                               prev_packet_default_end_cv->clock_class);
+                       ret = -1;
+                       goto end;
+               }
+
+               bt_clock_value_set_raw_value(
+                       packet->prev_packet_info.default_end_cv.cv,
+                       prev_packet_default_end_cv->value);
+               packet->prev_packet_info.default_end_cv.avail =
+                       BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE;
+       }
+
+       /* Discarded event counter */
+       packet->prev_packet_info.discarded_event_counter =
+               prev_packet->discarded_event_counter;
+
+       /* Sequence number */
+       packet->prev_packet_info.seq_num = prev_packet->seq_num;
+
+end:
+       return ret;
+}
+
+struct bt_packet *bt_packet_create(struct bt_stream *stream,
+               enum bt_packet_previous_packet_availability prev_packet_avail,
+               struct bt_packet *prev_packet)
+{
+       struct bt_packet *packet = NULL;
+       int ret;
+
+       BT_ASSERT_PRE_NON_NULL(stream, "Stream");
+       BT_ASSERT_PRE(!prev_packet || prev_packet->stream == stream,
+               "New packet's and previous packet's stream are not the same: "
+               "%![new-packet-stream-]+s, %![prev-packet]+a, "
+               "%![prev-packet-stream]+s", stream, prev_packet,
+               prev_packet->stream);
+       BT_ASSERT_PRE(
+               prev_packet_avail == BT_PACKET_PREVIOUS_PACKET_AVAILABILITY_AVAILABLE ||
+               prev_packet_avail == BT_PACKET_PREVIOUS_PACKET_AVAILABILITY_NOT_AVAILABLE ||
+               prev_packet_avail == BT_PACKET_PREVIOUS_PACKET_AVAILABILITY_NONE,
+               "Invalid previous packet availability value: val=%d",
+               prev_packet_avail);
+       BT_ASSERT_PRE(!prev_packet ||
+               prev_packet_avail == BT_PACKET_PREVIOUS_PACKET_AVAILABILITY_AVAILABLE,
+               "Previous packet is available, but previous packet is NULL.");
+       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->base);
+       }
+
+       ret = snapshot_prev_packet_properties(packet, prev_packet_avail,
+               prev_packet);
+       if (ret) {
+               /* Recycle */
+               BT_PUT(packet);
+               goto end;
+       }
+
+       if (prev_packet) {
+               bt_packet_validate_properties(prev_packet);
+               bt_packet_set_is_frozen(prev_packet, true);
+       }
+
+       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->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->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;
+}
+
+enum bt_packet_property_availability
+bt_packet_borrow_default_beginning_clock_value(struct bt_packet *packet,
+               struct bt_clock_value **clock_value)
+{
+       enum bt_packet_property_availability avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE;
+
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value");
+       *clock_value = packet->begin_cv_set.default_cv;
+       if (!*clock_value) {
+               avail = BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       }
+
+       return avail;
+}
+
+enum bt_packet_property_availability
+bt_packet_borrow_default_end_clock_value(struct bt_packet *packet,
+               struct bt_clock_value **clock_value)
+{
+       enum bt_packet_property_availability avail =
+               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE;
+
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value");
+       *clock_value = packet->end_cv_set.default_cv;
+       if (!*clock_value) {
+               avail = BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       }
+
+       return avail;
+}
+
+enum bt_packet_previous_packet_availability
+bt_packet_get_previous_packet_availability(struct bt_packet *packet)
+{
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       return packet->prev_packet_info.avail;
+}
+
+enum bt_packet_property_availability
+bt_packet_borrow_previous_packet_default_end_clock_value(
+               struct bt_packet *packet, struct bt_clock_value **clock_value)
+{
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value");
+       *clock_value = packet->prev_packet_info.default_end_cv.cv;
+       return packet->prev_packet_info.default_end_cv.avail;
+}
+
+enum bt_packet_property_availability bt_packet_get_discarded_event_counter(
+               struct bt_packet *packet, uint64_t *counter)
+{
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(counter, "Counter");
+       *counter = packet->discarded_event_counter.value;
+       return packet->discarded_event_counter.avail;
+}
+
+enum bt_packet_property_availability bt_packet_get_sequence_number(
+               struct bt_packet *packet, uint64_t *sequence_number)
+{
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(sequence_number, "Sequence number");
+       *sequence_number = packet->seq_num.value;
+       return packet->seq_num.avail;
+}
+
+enum bt_packet_property_availability bt_packet_get_discarded_event_count(
+               struct bt_packet *packet, uint64_t *count)
+{
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(count, "Count");
+       *count = packet->discarded_event_count.value;
+       return packet->discarded_event_count.avail;
+}
+
+enum bt_packet_property_availability bt_packet_get_discarded_packet_count(
+               struct bt_packet *packet, uint64_t *count)
+{
+       BT_ASSERT_PRE_NON_NULL(packet, "Packet");
+       BT_ASSERT_PRE_NON_NULL(count, "Count");
+       *count = packet->discarded_packet_count.value;
+       return packet->discarded_packet_count.avail;
+}
+
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