lib: make precondition failure messages more clear on message creation

[babeltrace.git] / lib / graph / message / packet.c

diff --git a/lib/graph/message/packet.c b/lib/graph/message/packet.c
index abaa7c7f6e37a744a94ff1bdc14e2f66089a4253..9ed9a0c47f2eb3054553feb4402dab82f0d6d504 100644 (file)
--- a/lib/graph/message/packet.c
+++ b/lib/graph/message/packet.c
@@ -87,7 +87,7 @@ struct bt_message *create_packet_message(
        struct bt_message_packet *message = NULL;
        struct bt_stream *stream;
        struct bt_stream_class *stream_class;
-       bool packet_has_default_clock_snapshot;
+       bool need_cs;
 
        BT_ASSERT(msg_iter);
        BT_ASSERT_PRE_NON_NULL(packet, "Packet");
@@ -97,21 +97,26 @@ struct bt_message *create_packet_message(
        BT_ASSERT(stream_class);
 
        if (pool == &msg_iter->graph->packet_begin_msg_pool) {
-               packet_has_default_clock_snapshot =
-                       stream_class->packets_have_beginning_default_clock_snapshot;
+               need_cs = stream_class->packets_have_beginning_default_clock_snapshot;
        } else {
-               packet_has_default_clock_snapshot =
-                       stream_class->packets_have_end_default_clock_snapshot;
+               need_cs = stream_class->packets_have_end_default_clock_snapshot;
        }
 
        /*
         * `packet_has_default_clock_snapshot` implies that the stream
         * class has a default clock class (precondition).
         */
-       BT_ASSERT_PRE((with_cs && packet_has_default_clock_snapshot) ||
-               (!with_cs && !packet_has_default_clock_snapshot),
+       BT_ASSERT_PRE(need_cs ? with_cs : true,
                "Unexpected stream class configuration when creating "
-               "a packet beginning or end message: ",
+               "a packet beginning or end message: "
+               "a default clock snapshot is needed, but none was provided: "
+               "%![stream-]+s, %![sc-]+S, with-cs=%d, "
+               "cs-val=%" PRIu64,
+               stream, stream_class, with_cs, raw_value);
+       BT_ASSERT_PRE(!need_cs ? !with_cs : true,
+               "Unexpected stream class configuration when creating "
+               "a packet beginning or end message: "
+               "no default clock snapshot is needed, but one was provided: "
                "%![stream-]+s, %![sc-]+S, with-cs=%d, "
                "cs-val=%" PRIu64,
                stream, stream_class, with_cs, raw_value);