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596 lines (581 loc) · 23.2 KB
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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2021. 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%
%%
%%----------------------------------------------------------------------
%% Purpose: Define event transforms and trace patterns
%%----------------------------------------------------------------------
-module(et_selector).
-export([make_pattern/1,
change_pattern/1,
parse_event/2]).
-compile([{nowarn_deprecated_function,[{erlang,now,0}]}]).
-include("../include/et.hrl").
%%----------------------------------------------------------------------
%% make_pattern(RawPattern) -> TracePattern
%%
%% Makes a trace pattern suitable to feed change_pattern/1
%% See also erlang:trace_pattern/2 for more info about its match_spec()
%%
%% RawPattern = detail_level()
%% TracePattern = erlang_trace_pattern_match_spec()
%%
%% detail_level() = min | max | integer(X) when X >= 0, X =< 100
%%
%% min - minimum level of tracing (ignore calls to trace_me/4,5)
%% max - maximum level of tracing (all calls to trace_me/4,5)
%% integer() - explicit detail level of tracing
%%----------------------------------------------------------------------
make_pattern(undefined) ->
{undefined, undefined};
make_pattern({Mod, Pattern}) when is_atom(Mod) ->
case Pattern of
min ->
{Mod, []};
max ->
Head = ['$1', '_', '_', '_', '_'],
Body = [],
Cond = [],
{Mod, [{Head, Cond, Body}]};
DetailLevel when is_integer(DetailLevel) ->
Head = ['$1', '_', '_', '_', '_'],
Body = [],
Cond = [{ '<', '$1', DetailLevel}],
{Mod, [{Head, Cond, Body}]};
undefined ->
{Mod, undefined};
_ ->
exit({bad_pattern, Pattern})
end.
%%----------------------------------------------------------------------
%% change_pattern(Pattern) -> ok
%%
%% Activates/deactivates tracing by changing the current trace pattern
%%
%% Pattern = detail_level() |
%% empty_match_spec() |
%% erlang_trace_pattern_match_spec()
%%
%% detail_level() = min | max | integer(X) when X =<0, X >= 100
%% empty_match_spec() = []
%%
%% Min detail level deactivates tracing of calls to trace_me/4,5
%%
%% Max detail level activates tracing of all calls to trace_me/4,5
%%
%% integer(X) detail level activates tracing of all calls to
%% trace_me/4,5 whose detail level argument is lesser than X.
%%
%% An empty match spec deactivates tracing of calls to trace_me/4,5
%%
%% Other match specs activates tracing of calls to trace_me/4,5
%% accordingly with erlang:trace_pattern/2.
%%----------------------------------------------------------------------
change_pattern({Mod, Pattern}) when is_atom(Mod) ->
MFA = {Mod, trace_me, 5},
case Pattern of
undefined ->
ignore;
[] ->
error_to_exit(old_ctp(MFA)),
error_to_exit(dbg:ctp(MFA)),
error_to_exit(dbg:p(all, clear));
List when is_list(List) ->
error_to_exit(old_ctp(MFA)),
error_to_exit(old_tp(MFA, Pattern)),
error_to_exit(dbg:ctp(MFA)),
error_to_exit(dbg:tp(MFA, Pattern)),
error_to_exit(dbg:p(all, [call, timestamp]));
Other ->
change_pattern(make_pattern({Mod, Other}))
end,
ok.
old_ctp({Mod, _Fun, Args}) ->
case Mod of
et -> {ok, ignore};
_ -> dbg:ctp({Mod, report_event, Args})
end.
old_tp({Mod, _Fun, Args}, Pattern) ->
case Mod of
et -> {ok, ignore};
_ -> dbg:tp({Mod, report_event, Args}, Pattern)
end.
error_to_exit({error, Reason}) ->
exit(Reason);
error_to_exit({ok, Res}) ->
Res.
%%----------------------------------------------------------------------
%% parse_event(Mod, ValidTraceData) -> false | true | {true, Event}
%%
%% Transforms trace data and makes an event record out of it
%%
%% ValidTraceData = erlang_trace_data() | record(event)
%% Mod = module_name() | undefined
%% module_name() = atom()
%%
%% erlang_trace_data() =
%%
%% {trace, Pid, Label, Info} |
%% {trace, Pid, Label, Info, Extra} |
%% {trace_ts, Pid, Label, Info, ReportedTS} |
%% {trace_ts, Pid, Label, Info, Extra, ReportedTS} |
%% {seq_trace, Label, Info} |
%% {seq_trace, Label, Info, ReportedTS} |
%% {drop, NumberOfDroppedItems}
%%
%% See erlang:trace/3 for more info about the semantics of
%% the trace data.
%%
%% An event record consists of the following fields:
%%
%% detail_level - Noise has a high level as opposed to essentials.
%% trace_ts - Time when the trace was generated.
%% Same as event_ts if omitted in trace data.
%% event_ts - Time when the event record was created.
%% from - From actor, such as sender of a message.
%% to - To actor, such as receiver of message.
%% label - Label intended to provide a brief event summary.
%% contents - All nitty gritty details of the event.
%%
%% See et:trace_me/4 and et:trace_me/5 for details.
%%
%% Returns:
%%
%% {true, Event} - where Event is an #event{} record representing the
%% trace data
%% true - means that the trace data already is an event
%% record and that it is valid as it is.
%% No transformation is needed.
%% false - means that the trace data is uninteresting and
%% should be dropped
%%----------------------------------------------------------------------
parse_event(_Mod, E) when is_record(E, event) ->
true;
parse_event(Mod, Trace) ->
ParsedTS = erlang:now(),
case Trace of
{trace, Pid, Label, Info} ->
parse_event(Mod, Trace, ParsedTS, ParsedTS, Pid, Label, [Info]);
{trace, Pid, Label, Info, Extra} ->
parse_event(Mod, Trace, ParsedTS, ParsedTS, Pid, Label, [Info, Extra]);
{trace_ts, Pid, Label, Info, ReportedTS} ->
parse_event(Mod, Trace, ParsedTS, ReportedTS, Pid, Label, [Info]);
{trace_ts, Pid, Label, Info, Extra, ReportedTS} ->
parse_event(Mod, Trace, ParsedTS, ReportedTS, Pid, Label, [Info, Extra]);
{seq_trace, Label, Info} ->
parse_s
10BC8
eq_event(Trace, ParsedTS, ParsedTS, Label, Info);
{seq_trace, Label, Info, ReportedTS} ->
parse_seq_event(Trace, ParsedTS, ReportedTS, Label, Info);
{drop, NumberOfDroppedItems} ->
DetailLevel = 20,
{true, #event{detail_level = DetailLevel,
trace_ts = ParsedTS,
event_ts = ParsedTS,
from = undefined,
to = undefined,
label = drop,
contents = [{label, drop},
{detail_level, DetailLevel},
{from, undefined},
{to, undefined},
{drop, NumberOfDroppedItems}]}};
_ ->
error_logger:format("~p(~p): Ignoring unknown trace type -> ~tp~n~n",
[?MODULE, ?LINE, Trace]),
false
end.
parse_seq_event(Trace, ParsedTS, ReportedTS, Label, Info) ->
case Info of
{send, Serial, From, To, Msg} ->
DetailLevel = 15,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = To,
label = {seq_send, Label},
contents = [{label, {seq_send, Label}},
{detail_level, DetailLevel},
{from, From},
{to, To},
{serial, Serial},
{msg, Msg}]}};
{'receive', Serial, From, To, Msg} ->
DetailLevel = 10,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = To,
label = {seq_receive, Label},
contents = [{label, {seq_receive, Label}},
{detail_level, DetailLevel},
{from, From},
{to, To},
{serial, Serial},
{msg, Msg}]}};
{print, Serial, From, _, UserInfo} ->
DetailLevel = 5,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = {seq_print, Label},
contents = [{label, {seq_print, Label}},
{detail_level, DetailLevel},
{from, From},
{to, From},
{serial, Serial},
{user_info, UserInfo}]}};
_ ->
error_logger:format("~p(~p): Ignoring unknown trace type -> ~tp~n~n",
[?MODULE, ?LINE, Trace]),
false
end.
parse_event(Mod, Trace, ParsedTS, ReportedTS, From, Label, Contents) ->
case Label of
'receive' ->
DetailLevel = 35,
[Msg] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{msg, Msg}]}};
send ->
DetailLevel = 40,
[Msg, To] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = To,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, To},
{msg, Msg}]}};
send_to_non_existing_process ->
DetailLevel = 40,
[Msg, To] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = To,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, To},
{msg, Msg}]}};
call ->
case Contents of
[{M, trace_me, [UserDetailLevel, UserFrom, UserTo, UserLabel, UserContents]}] when M == Mod, Mod /= undefined ->
{true, #event{detail_level = UserDetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = UserFrom,
to = UserTo,
label = UserLabel,
contents = UserContents}}; % Term
[{M, report_event, [UserDetailLevel, UserFrom, UserTo, UserLabel, UserContents]}] when M == Mod, Mod /= undefined ->
{true, #event{detail_level = UserDetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = UserFrom,
to = UserTo,
label = UserLabel,
contents = UserContents}}; % Term
[MFA] ->
DetailLevel = 45,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA}]}};
[MFA, PamResult] ->
DetailLevel = 45,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA},
{pam_result, PamResult}]}}
end;
return_to ->
DetailLevel = 50,
[MFA] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA}]}};
return_from ->
DetailLevel = 52,
[MFA, ReturnValue] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA},
{return, ReturnValue}]}};
exception_from ->
DetailLevel = 54,
[MFA, Exception] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA},
{exception, Exception}]}};
spawn ->
DetailLevel = 25,
[NewPid, MFA] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = NewPid,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, NewPid},
{mfa, MFA}]}}; % MFA | Term
exit ->
DetailLevel = 30,
[Reason] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{reason, Reason}]}};
link ->
DetailLevel = 55,
[LinkTo] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = LinkTo,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, LinkTo}]}};
unlink ->
DetailLevel = 60,
[UnlinkFrom] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = UnlinkFrom,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, UnlinkFrom}]}};
getting_linked ->
DetailLevel = 65,
[LinkTo] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = LinkTo,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, LinkTo}]}};
getting_unlinked ->
DetailLevel = 67,
[UnlinkFrom] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = UnlinkFrom,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, UnlinkFrom}]}};
register ->
DetailLevel = 70,
[Name] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{name, Name}]}};
unregister ->
DetailLevel = 75,
[Name] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{name, Name}]}};
in ->
DetailLevel = 90,
[MFA] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA}]}}; % MFA | 0
out ->
DetailLevel = 95,
[MFA] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{mfa, MFA}]}}; % MFA | 0
gc_minor_start ->
DetailLevel = 80,
[GcKeyValueList] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{gc_items, GcKeyValueList}]}};
gc_minor_end ->
DetailLevel = 85,
[GcKeyValueList] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{gc_items, GcKeyValueList}]}};
gc_major_start ->
DetailLevel = 80,
[GcKeyValueList] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{gc_items, GcKeyValueList}]}};
gc_major_end ->
DetailLevel = 85,
[GcKeyValueList] = Contents,
{true, #event{detail_level = DetailLevel,
trace_ts = ReportedTS,
event_ts = ParsedTS,
from = From,
to = From,
label = Label,
contents = [{label, Label},
{detail_level, DetailLevel},
{from, From},
{to, From},
{gc_items, GcKeyValueList}]}};
_ ->
error_logger:format("~p(~p): Ignoring unknown trace type -> ~tp~n~n",
[?MODULE, ?LINE, Trace]),
false
end.