%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2002-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(ttb_et).
-author('[email protected]').
-include("et.hrl").
-export([handler/4]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% ----------- TTB format handler -----------
handler(Out,Trace,Traci,initial) ->
S = self(),
spawn(fun() -> init_et(S) end),
receive {et_started,Collector} -> ok end,
handler(Out,Trace,Traci,Collector);
handler(_,end_of_trace,_Traci,Col) ->
get_returns(Col),
ok;
handler(_,Trace,_Traci,Col) ->
{ok,NewCol} = et_collector:report(Col,Trace),
NewCol.
%%% ----------- Collector Filter -----------
collector(Event) when is_record(Event,event) ->
%% if collector is selected from viewer menu
true;
collector(Trace) ->
et_selector:parse_event(undefined,Trace).
%% After applying collector filter to all events, iterate over
%% all events backwards and collect call/return information:
%%
%% MFA collected from return_to events is added to call and
%% return_from events as {caller,MFA} and {return_to,MFA} respecively.
%% MFA collected from call events is added to return_to events as
%% {return_from,MFA}
%%
%% This information can then be used by any filter for generating to-
%% and from fields.
get_returns(Col) ->
Fun = fun(Event,Acc) -> collect_return_info(Event,Acc,Col) end,
et_collector:iterate(Col, last, '-infinity', Fun, dict:new()).
collect_return_info(#event{label=L,from=Pid}=E,Acc,_Col)
when L==return_to;L==return_from->
%% Stacking all return_to and return_from events
dict:update(Pid,fun(Old) -> [E|Old] end, [E], Acc);
collect_return_info(#event{label=call,from=Pid,contents=Contents}=E,Acc,Col) ->
%% Popping return_from and return_to events
%% If both exist, return_from will _always_ be first!!!
MFA = get_mfarity(Contents),
{Caller,NewAcc} =
case dict:find(Pid,Acc) of
{ok,[#event{label=return_from}=RetFrom,
#event{label=return_to}=RetTo | Rets]} ->
RetToCont = RetTo#event.contents,
C = get_mfarity(RetToCont),
NewRetTo = RetTo#event{contents=RetToCont++[{return_from,MFA}]},
RetFromCont = RetFrom#event.contents,
NewRetFrom =
RetFrom#event{contents=RetFromCont++[{return_to,C}]},
et_collector:report(Col,NewRetTo),
et_collector:report(Col,NewRetFrom),
{C, dict:store(Pid,Rets,Acc)};
{ok,[#event{label=return_to}=RetTo | Rets]} ->
%% No return_from
RetToCont = RetTo#event.contents,
C = get_mfarity(RetToCont),
NewRetTo = RetTo#event{contents=RetToCont++[{return_from,MFA}]},
et_collector:report(Col,NewRetTo),
{C, dict:store(Pid,Rets,Acc)};
{ok,[#event{label=return_from}=RetFrom | Rets]} ->
%% No return_to, check if caller(pam_result) is in call event
C = get_caller(Contents),
RetFromCont = RetFrom#event.contents,
NewRetFrom =
RetFrom#event{contents=RetFromCont++[{return_to,C}]},
et_collector:report(Col,NewRetFrom),
{C, dict:store(Pid,Rets,Acc)};
_noreturn ->
{nocaller,Acc}
end,
NewE = E#event{contents=Contents++[{caller,Caller}]},
et_collector:report(Col,NewE),
NewAcc;
collect_return_info(_E,Acc,_Col) ->
Acc.
init_et(Parent) ->
process_flag(trap_exit,true),
% ets:new(ttb_et_table,[set,named_table,public]),
% ets:insert(ttb_et_table,{traci,Traci}),
EtOpt = [{active_filter,processes},
{dict_insert, {filter, collector}, fun collector/1},
{dict_insert, {filter, processes}, fun processes/1},
{dict_insert, {filter, modules}, fun modules/1},
{dict_insert, {filter, mods_and_procs}, fun mods_and_procs/1},
{dict_insert, {filter, functions}, fun functions/1},
{dict_insert, {filter, funcs_and_procs}, fun funcs_and_procs/1},
{hide_actions, false},
{max_events, infinity},
{max_actors, infinity}],
{ok, Viewer} = et_viewer:start_link(EtOpt),
Collector = et_viewer:get_collector_pid(Viewer),
Parent ! {et_started,Collector},
receive
{'EXIT',Viewer,shutdown} ->
ok
end.
%%% ----------- Viewer Filters -----------
processes(E0) ->
E = label(E0),
{{FromProc,FromNode},{ToProc,ToNode}} =
get_actors(E#event.from,E#event.to),
{true,E#event{from = io_lib:format("~w~n~w",[FromProc,FromNode]),
to = io_lib:format("~w~n~w",[ToProc,ToNode])}}.
mods_and_procs(E) ->
ActorFun = fun({M,_F,_A},{Proc,Node}) ->
io_lib:format("~w~n~w~n~w",[M,Proc,Node])
end,
calltrace_filter(E,ActorFun).
modules(E) ->
ActorFun = fun({M,_F,_A},{_Proc,Node}) ->
io_lib:format("~w~n~w",[M,Node])
end,
calltrace_filter(E,ActorFun).
funcs_and_procs(E) ->
ActorFun = fun({M,F,A},{Proc,Node}) ->
io_lib:format("~s~n~w~n~w",[mfa(M,F,A),Proc,Node])
end,
calltrace_filter(E,ActorFun).
functions(E) ->
ActorFun = fun({M,F,A},{_Proc,Node}) ->
io_lib:format("~s~n~w",[mfa(M,F,A),Node])
end,
calltrace_filter(E,ActorFun).
%% Common filter used by mods_and_procs/1 and modules/1
calltrace_filter(E,ActorFun) ->
{From,To} = get_actors(E#event.from,E#event.to),
calltrace_filter(E,From,To,ActorFun).
calltrace_filter(#event{label=call}=E,From,To,ActorFun) ->
Cont = E#event.contents,
MFA = get_mfarity(Cont),
case lists:keysearch(caller,1,Cont) of
{value,{_,{_CM,_CF,_CA}=Caller}} ->
{true, E#event{label = label(call,MFA),
from = ActorFun(Caller,From),
to = ActorFun(MFA,To)}};
{value,{_, _}} ->
{true, E#event{label = label(call,MFA),
from = ActorFun(MFA,From),
to = ActorFun(MFA,To)}}
end;
calltrace_filter(#event{label=return_from}=E,From,To,ActorFun) ->
Cont = E#event.contents,
MFA = get_mfarity(Cont),
case lists:keysearch(return_to,1,Cont) of
{value,{_,{_M2,_F2,_A2}=MFA2}} ->
{true, E#event{label = label(return_from,MFA),
from = ActorFun(MFA,From),
to = ActorFun(MFA2,To)}};
{value,{_, _}} ->
{true, E#event{label = label(return_from,MFA),
from = ActorFun(MFA,From),
to = ActorFun(MFA,To)}}
end;
calltrace_filter(#event{label=return_to}=E,From,To,ActorFun) ->
Cont = E#event.contents,
{value,{_,{_M2,_F2,_A2}=MFA2}} = lists:keysearch(return_from,1,Cont),
case get_mfarity(Cont) of
{_M,_F,_A}=MFA ->
{true, E#event{label = label(return_to,MFA),
from = ActorFun(MFA2,From),
to = ActorFun(MFA,To)}};
undefined ->
{true, E#event{label = "return_to unknown",
from = ActorFun(MFA2,From),
to = ActorFun(MFA2,To)}}
end;
calltrace_filter(_E,_From,_To,_ActorFun) ->
false.
label(Event=#event{label=L,contents=C}) ->
case lists:keysearch(mfa,1,C) of
{value,{mfa,MFA}} -> Event#event{label=label(L,MFA)};
false -> Event
end.
label(L,{M,F,A}) -> label(L,M,F,A);
label(L,Other) -> io_lib:format("~w ~w",[L,Other]).
label(call,M,F,A) -> "call " ++ mfa(M,F,A);
label(return_from,M,F,A) -> "return_from " ++ mfa(M,F,A);
label(return_to,M,F,A) -> "return_to " ++ mfa(M,F,A);
label(spawn,M,F,A) -> "spawn " ++ mfa(M,F,A);
label(out,M,F,A) -> "out " ++ mfa(M,F,A);
label(in,M,F,A) -> "in " ++ mfa(M,F,A).
mfa(M,F,A) -> atom_to_list(M) ++ ":" ++ fa(F,A).
fa(F,A) -> atom_to_list(F) ++ "/" ++ integer_to_list(arity(A)).
arity(L) when is_list(L) -> length(L);
arity(I) when is_integer(I) -> I.
get_actors(From,To) ->
case {get_proc(From),get_proc(To)} of
{{_FP,_FN},{_TP,_TN}}=R -> R;
{{FP,FN},T} -> {{FP,FN},{T,FN}};
{F,{TP,TN}} -> {{F,TN},{TP,TN}};
{F,T} -> {{F,unknown},{T,unknown}}
end.
get_proc({_Pid,Name,Node}) when is_atom(Name) -> {Name,Node};
get_proc({Pid,_initfunc,Node}) -> {Pid,Node};
get_proc(P) when is_pid(P); is_port(P) -> {P,node(P)};
get_proc(P) -> P.
get_mfarity(List) ->
case get_mfa(List) of
{M,F,A} -> {M,F,arity(A)};
Other -> Other
end.
get_mfa(List) ->
{value,{mfa,MFA}} = lists:keysearch(mfa,1,List),
MFA.
get_caller(List) ->
case lists:keysearch(pam_result,1,List) of
{value,{pam_result,{M,F,A}}} -> {M,F,arity(A)};
{value,{pam_result,undefined}} -> undefined;
{value,{pam_result,_Other}} -> nocaller;
false -> nocaller
end.
