Make API CTF-agnostic
[babeltrace.git] / lib / ctf-ir / packet.c
index 43506ef8c1bc54404c5e67e178ed611b2771cfeb..d3fce47af34e1a872c653609ce9114f5aa5d7cc8 100644 (file)
 #include <babeltrace/ctf-ir/stream-class.h>
 #include <babeltrace/ctf-ir/stream.h>
 #include <babeltrace/ctf-ir/stream-internal.h>
+#include <babeltrace/ctf-ir/clock-value-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>
 
+#define BT_ASSERT_PRE_PACKET_HOT(_packet) \
+       BT_ASSERT_PRE_HOT((_packet), "Packet", ": %!+a", (_packet))
+
 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)
+struct bt_field *bt_packet_borrow_header_field(struct bt_packet *packet)
 {
        BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       return packet->header ? (void *) packet->header->field : NULL;
+       return packet->header_field ? packet->header_field->field : NULL;
 }
 
-struct bt_field *bt_packet_borrow_context(struct bt_packet *packet)
+struct bt_field *bt_packet_borrow_context_field(struct bt_packet *packet)
 {
        BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       return packet->context ? (void *) packet->context->field : NULL;
+       return packet->context_field ? packet->context_field->field : NULL;
 }
 
 BT_HIDDEN
@@ -68,20 +72,18 @@ void _bt_packet_set_is_frozen(struct bt_packet *packet, bool is_frozen)
                return;
        }
 
-       BT_LOGD("Setting packet's frozen state: addr=%p, frozen=%d",
-               packet, is_frozen);
+       BT_LIB_LOGD("Setting packet's frozen state: %![packet-]+a, "
+               "is-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,
+       if (packet->header_field) {
+               BT_LOGD_STR("Setting packet's header field's frozen state.");
+               bt_field_set_is_frozen(packet->header_field->field,
                        is_frozen);
        }
 
-       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,
+       if (packet->context_field) {
+               BT_LOGD_STR("Setting packet's context field's frozen state.");
+               bt_field_set_is_frozen(packet->context_field->field,
                        is_frozen);
        }
 
@@ -89,62 +91,44 @@ void _bt_packet_set_is_frozen(struct bt_packet *packet, bool is_frozen)
 }
 
 static inline
-void bt_packet_reset_avail(struct bt_packet *packet)
+void reset_counter_snapshots(struct bt_packet *packet)
 {
-       /* 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;
+       packet->discarded_event_counter_snapshot.base.avail =
+               BT_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
+       packet->packet_counter_snapshot.base.avail =
+               BT_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
 }
 
 static inline
-void bt_packet_reset(struct bt_packet *packet)
+void reset_packet(struct bt_packet *packet)
 {
        BT_ASSERT(packet);
+       BT_LIB_LOGD("Resetting packet: %!+a", 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->header_field) {
+               bt_field_set_is_frozen(packet->header_field->field, false);
+               bt_field_reset(packet->header_field->field);
        }
 
-       if (packet->context) {
-               bt_field_set_is_frozen_recursive(
-                       (void *) packet->context->field, false);
-               bt_field_reset_recursive((void *) packet->context->field);
+       if (packet->context_field) {
+               bt_field_set_is_frozen(packet->context_field->field, false);
+               bt_field_reset(packet->context_field->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->default_beginning_cv) {
+               bt_clock_value_reset(packet->default_beginning_cv);
+       }
 
-       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;
+       if (packet->default_end_cv) {
+               bt_clock_value_reset(packet->default_end_cv);
        }
+
+       reset_counter_snapshots(packet);
 }
 
 static
-void bt_packet_header_field_recycle(struct bt_field_wrapper *header_field,
+void recycle_header_field(struct bt_field_wrapper *header_field,
                struct bt_trace *trace)
 {
        BT_ASSERT(header_field);
@@ -156,7 +140,7 @@ void bt_packet_header_field_recycle(struct bt_field_wrapper *header_field,
 }
 
 static
-void bt_packet_context_field_recycle(struct bt_field_wrapper *context_field,
+void recycle_context_field(struct bt_field_wrapper *context_field,
                struct bt_stream_class *stream_class)
 {
        BT_ASSERT(context_field);
@@ -197,7 +181,7 @@ void bt_packet_recycle(struct bt_packet *packet)
         *
         * 4. Put our stream reference.
         */
-       bt_packet_reset(packet);
+       reset_packet(packet);
        stream = packet->stream;
        BT_ASSERT(stream);
        packet->stream = NULL;
@@ -208,32 +192,39 @@ void bt_packet_recycle(struct bt_packet *packet)
 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.");
+       BT_LIB_LOGD("Destroying packet: %!+a", packet);
 
-       if (packet->header) {
+       if (packet->header_field) {
                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)));
+                       recycle_header_field(packet->header_field,
+                               bt_stream_class_borrow_trace_inline(
+                                       packet->stream->class));
                } else {
-                       bt_field_wrapper_destroy(packet->header);
+                       bt_field_wrapper_destroy(packet->header_field);
                }
        }
 
-       if (packet->context) {
+       if (packet->context_field) {
                if (packet->stream) {
                        BT_LOGD_STR("Recycling packet's context field.");
-                       bt_packet_context_field_recycle(packet->context,
-                               bt_stream_borrow_class(packet->stream));
+                       recycle_context_field(packet->context_field,
+                               packet->stream->class);
                } else {
-                       bt_field_wrapper_destroy(packet->context);
+                       bt_field_wrapper_destroy(packet->context_field);
                }
        }
 
-       bt_clock_value_set_finalize(&packet->begin_cv_set);
-       bt_clock_value_set_finalize(&packet->end_cv_set);
+       if (packet->default_beginning_cv) {
+               BT_LOGD_STR("Recycling beginning clock value.");
+               bt_clock_value_recycle(packet->default_beginning_cv);
+       }
+
+       if (packet->default_end_cv) {
+               BT_LOGD_STR("Recycling end clock value.");
+               bt_clock_value_recycle(packet->default_end_cv);
+       }
+
        BT_LOGD_STR("Putting packet's stream.");
        bt_put(packet->stream);
        g_free(packet);
@@ -243,281 +234,80 @@ 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->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);
-       BT_ASSERT(trace);
+       BT_LIB_LOGD("Creating packet object: %![stream-]+s", stream);
        packet = g_new0(struct bt_packet, 1);
        if (!packet) {
                BT_LOGE_STR("Failed to allocate one packet object.");
-               goto end;
+               goto error;
        }
 
        bt_object_init_shared(&packet->base,
                (bt_object_release_func) bt_packet_recycle);
        packet->stream = bt_get(stream);
+       trace = bt_stream_class_borrow_trace_inline(stream->class);
+       BT_ASSERT(trace);
 
-       if (trace->packet_header_field_type) {
-               BT_LOGD("Creating initial packet header field: ft-addr=%p",
-                       trace->packet_header_field_type);
-               packet->header = bt_field_wrapper_create(
+       if (trace->packet_header_ft) {
+               BT_LOGD_STR("Creating initial packet header field.");
+               packet->header_field = bt_field_wrapper_create(
                        &trace->packet_header_field_pool,
-                       (void *) trace->packet_header_field_type);
-               if (!packet->header) {
-                       BT_LOGE("Cannot create packet header field wrapper.");
-                       BT_PUT(packet);
-                       goto end;
+                       trace->packet_header_ft);
+               if (!packet->header_field) {
+                       BT_LOGE_STR("Cannot create packet header field wrapper.");
+                       goto error;
                }
        }
 
-       if (stream->stream_class->packet_context_field_type) {
-               BT_LOGD("Creating initial packet context field: ft-addr=%p",
-                       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("Cannot create packet context field wrapper.");
-                       BT_PUT(packet);
-                       goto end;
+       if (stream->class->packet_context_ft) {
+               BT_LOGD_STR("Creating initial packet context field.");
+               packet->context_field = bt_field_wrapper_create(
+                       &stream->class->packet_context_field_pool,
+                       stream->class->packet_context_ft);
+               if (!packet->context_field) {
+                       BT_LOGE_STR("Cannot create packet context field wrapper.");
+                       goto error;
                }
        }
 
-       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);
+       if (stream->class->default_clock_class) {
+               if (stream->class->packets_have_default_beginning_cv) {
+                       packet->default_beginning_cv = bt_clock_value_create(
+                               stream->class->default_clock_class);
+                       if (!packet->default_beginning_cv) {
+                               /* bt_clock_value_create() logs errors */
+                               goto error;
+                       }
                }
 
-               /* 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);
+               if (stream->class->packets_have_default_end_cv) {
+                       packet->default_end_cv = bt_clock_value_create(
+                               stream->class->default_clock_class);
+                       if (!packet->default_end_cv) {
+                               /* bt_clock_value_create() logs errors */
+                               goto error;
+                       }
                }
        }
 
-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;
+       reset_counter_snapshots(packet);
+       BT_LIB_LOGD("Created packet object: %!+a", packet);
+       goto end;
 
-       /* Sequence number */
-       packet->prev_packet_info.seq_num = prev_packet->seq_num;
+error:
+       BT_PUT(packet);
 
 end:
-       return ret;
+       return packet;
 }
 
-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 *bt_packet_create(struct bt_stream *stream)
 {
        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: "
@@ -525,166 +315,174 @@ struct bt_packet *bt_packet_create(struct bt_stream *stream,
                goto end;
        }
 
-       if (unlikely(!packet->stream)) {
+       if (likely(!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,
+int bt_packet_move_header_field(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(packet, "Packet");
        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,
+       BT_ASSERT_PRE_PACKET_HOT(packet);
+       trace = bt_stream_class_borrow_trace_inline(packet->stream->class);
+       BT_ASSERT_PRE(trace->packet_header_ft,
                "Trace has no packet header field type: %!+t",
                trace);
-
-       /* TODO: compare field types (precondition) */
+       BT_ASSERT_PRE(field_wrapper->field->type ==
+               trace->packet_header_ft,
+               "Unexpected packet header field's type: "
+               "%![ft-]+F, %![expected-ft-]+F", field_wrapper->field->type,
+               trace->packet_header_ft);
 
        /* Recycle current header field: always exists */
-       BT_ASSERT(packet->header);
-       bt_packet_header_field_recycle(packet->header, trace);
+       BT_ASSERT(packet->header_field);
+       recycle_header_field(packet->header_field, trace);
 
        /* Move new field */
-       packet->header = field_wrapper;
+       packet->header_field = field_wrapper;
        return 0;
 }
 
-int bt_packet_move_context(struct bt_packet *packet,
+int bt_packet_move_context_field(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(packet, "Packet");
        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 = packet->stream->class;
+       BT_ASSERT_PRE(stream_class->packet_context_ft,
                "Stream class has no packet context field type: %!+S",
                stream_class);
-
-       /* TODO: compare field types (precondition) */
+       BT_ASSERT_PRE(field_wrapper->field->type ==
+               stream_class->packet_context_ft,
+               "Unexpected packet header field's type: "
+               "%![ft-]+F, %![expected-ft-]+F", field_wrapper->field->type,
+               stream_class->packet_context_ft);
 
        /* Recycle current context field: always exists */
-       BT_ASSERT(packet->context);
-       bt_packet_context_field_recycle(packet->context, stream_class);
+       BT_ASSERT(packet->context_field);
+       recycle_context_field(packet->context_field, stream_class);
 
        /* Move new field */
-       packet->context = field_wrapper;
+       packet->context_field = 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)
+int bt_packet_set_default_beginning_clock_value(struct bt_packet *packet,
+               uint64_t value_cycles)
 {
-       enum bt_packet_property_availability avail =
-               BT_PACKET_PROPERTY_AVAILABILITY_AVAILABLE;
+       struct bt_stream_class *sc;
 
        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;
+       BT_ASSERT_PRE_PACKET_HOT(packet);
+       sc = packet->stream->class;
+       BT_ASSERT(sc);
+       BT_ASSERT_PRE(sc->default_clock_class,
+               "Packet's stream class has no default clock class: "
+               "%![packet-]+a, %![sc-]+S", packet, sc);
+       BT_ASSERT_PRE(sc->packets_have_default_beginning_cv,
+               "Packet's stream class indicates that its packets have "
+               "no default beginning clock value: %![packet-]+a, %![sc-]+S",
+               packet, sc);
+       BT_ASSERT(packet->default_beginning_cv);
+       bt_clock_value_set_value_inline(packet->default_beginning_cv, value_cycles);
+       BT_LIB_LOGV("Set packet's default beginning clock value: "
+               "%![packet-]+a, value=%" PRIu64, value_cycles);
+       return 0;
 }
 
-enum bt_packet_property_availability
-bt_packet_borrow_default_end_clock_value(struct bt_packet *packet,
-               struct bt_clock_value **clock_value)
+enum bt_clock_value_status 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->end_cv_set.default_cv;
-       if (!*clock_value) {
-               avail = BT_PACKET_PROPERTY_AVAILABILITY_NOT_AVAILABLE;
-       }
-
-       return avail;
+       BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value (output)");
+       *clock_value = packet->default_beginning_cv;
+       return BT_CLOCK_VALUE_STATUS_KNOWN;
 }
 
-enum bt_packet_previous_packet_availability
-bt_packet_get_previous_packet_availability(struct bt_packet *packet)
+int bt_packet_set_default_end_clock_value(struct bt_packet *packet,
+               uint64_t value_cycles)
 {
+       struct bt_stream_class *sc;
+
        BT_ASSERT_PRE_NON_NULL(packet, "Packet");
-       return packet->prev_packet_info.avail;
+       BT_ASSERT_PRE_PACKET_HOT(packet);
+       sc = packet->stream->class;
+       BT_ASSERT(sc);
+       BT_ASSERT_PRE(sc->default_clock_class,
+               "Packet's stream class has no default clock class: "
+               "%![packet-]+a, %![sc-]+S", packet, sc);
+       BT_ASSERT_PRE(sc->packets_have_default_end_cv,
+               "Packet's stream class indicates that its packets have "
+               "no default end clock value: %![packet-]+a, %![sc-]+S",
+               packet, sc);
+       BT_ASSERT(packet->default_end_cv);
+       bt_clock_value_set_value_inline(packet->default_end_cv, value_cycles);
+       BT_LIB_LOGV("Set packet's default end clock value: "
+               "%![packet-]+a, value=%" PRIu64, value_cycles);
+       return 0;
 }
 
-enum bt_packet_property_availability
-bt_packet_borrow_previous_packet_default_end_clock_value(
+enum bt_clock_value_status bt_packet_borrow_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;
+       BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value (output)");
+       *clock_value = packet->default_end_cv;
+       return BT_CLOCK_VALUE_STATUS_KNOWN;
 }
 
-enum bt_packet_property_availability bt_packet_get_discarded_event_counter(
-               struct bt_packet *packet, uint64_t *counter)
+enum bt_property_availability bt_packet_get_discarded_event_counter_snapshot(
+               struct bt_packet *packet, uint64_t *value)
 {
        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;
+       BT_ASSERT_PRE_NON_NULL(value, "Value (output)");
+       *value = packet->discarded_event_counter_snapshot.value;
+       return packet->discarded_event_counter_snapshot.base.avail;
 }
 
-enum bt_packet_property_availability bt_packet_get_sequence_number(
-               struct bt_packet *packet, uint64_t *sequence_number)
+int bt_packet_set_discarded_event_counter_snapshot(struct bt_packet *packet,
+               uint64_t value)
 {
        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;
+       BT_ASSERT_PRE_PACKET_HOT(packet);
+       BT_ASSERT_PRE(packet->stream->class->packets_have_discarded_event_counter_snapshot,
+               "Packet's stream's discarded event counter is not enabled: "
+               "%![packet-]+a", packet);
+       bt_property_uint_set(&packet->discarded_event_counter_snapshot, value);
+       return 0;
 }
 
-enum bt_packet_property_availability bt_packet_get_discarded_event_count(
-               struct bt_packet *packet, uint64_t *count)
+enum bt_property_availability bt_packet_get_packet_counter_snapshot(
+               struct bt_packet *packet, uint64_t *value)
 {
        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;
+       BT_ASSERT_PRE_NON_NULL(value, "Value (output)");
+       *value = packet->packet_counter_snapshot.value;
+       return packet->packet_counter_snapshot.base.avail;
 }
 
-enum bt_packet_property_availability bt_packet_get_discarded_packet_count(
-               struct bt_packet *packet, uint64_t *count)
+int bt_packet_set_packet_counter_snapshot(struct bt_packet *packet,
+               uint64_t value)
 {
        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;
+       BT_ASSERT_PRE_PACKET_HOT(packet);
+       BT_ASSERT_PRE(packet->stream->class->packets_have_packet_counter_snapshot,
+               "Packet's stream's packet counter is not enabled: "
+               "%![packet-]+a", packet);
+       bt_property_uint_set(&packet->packet_counter_snapshot, value);
+       return 0;
 }
-
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