Can't enable 'receive' trace for specific process using meta tracer and new trace API

[Svilen Ivanov]

With the old trace API, I can use meta tracing and 'trace' function in match specification body to enable 'receive' trace for a specific process:

Tracer = spawn(fun F() -> receive M -> io:format("~p~n",[M]), F() end end),
erlang:trace_pattern({lists, seq, 2},
                     [{'_', [], [{trace, [], ['receive', timestamp, {const, {tracer, Tracer}}]}]}],
                     [{meta, Tracer}]),
spawn(fun () ->
        lists:seq(1,10),
        self() ! message,
        receive
            message -> ok
        end
end).
{trace_ts,<0.89.0>,call,{lists,seq,[1,10]},{1720,685691,308331}}
<0.89.0>
{trace_ts,<0.89.0>,'receive',message,{1720,685691,308357}}

Trying the same thing with new API doesn't work:

Tracer = spawn(fun F() -> receive M -> io:format("~p~n",[M]), F() end end),
Session = trace:session_create(my_session, Tracer, []),
trace:function(Session,
               {lists, seq, 2},
               [{'_', [], [{trace, [], ['receive', timestamp]}]}],
               [meta]),
spawn(fun () ->
        lists:seq(1,10),
        self() ! message,
        receive
            message -> ok
        end
end).
{trace_ts,<0.89.0>,call,{lists,seq,[1,10]},{1720,685744,543604}}
<0.89.0>

[John Högberg]

Thanks for your report! Unfortunately most of us are on vacation right now, we'll revisit this once we're back. :-)