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-rw-r--r--lib/stdlib/src/sys.erl150
1 files changed, 119 insertions, 31 deletions
diff --git a/lib/stdlib/src/sys.erl b/lib/stdlib/src/sys.erl
index 0064414d6f..a04195c9ed 100644
--- a/lib/stdlib/src/sys.erl
+++ b/lib/stdlib/src/sys.erl
@@ -30,7 +30,8 @@
log_to_file/2, log_to_file/3, no_debug/1, no_debug/2,
install/2, install/3, remove/2, remove/3]).
-export([handle_system_msg/6, handle_system_msg/7, handle_debug/4,
- print_log/1, get_debug/3, debug_options/1, suspend_loop_hib/6]).
+ print_log/1, get_log/1, get_debug/3, debug_options/1, suspend_loop_hib/6]).
+-deprecated([{get_debug,3,eventually}]).
%%-----------------------------------------------------------------
%% Types
@@ -42,10 +43,17 @@
| {'global', term()}
| {'via', module(), term()}.
-type system_event() :: {'in', Msg :: _}
- | {'in', Msg :: _, From :: _}
+ | {'in', Msg :: _, State :: _}
| {'out', Msg :: _, To :: _}
| {'out', Msg :: _, To :: _, State :: _}
- | term().
+ | {'noreply', State :: _}
+ | {'continue', Continuation :: _}
+ | {'code_change', Event :: _, State :: _}
+ | {'postpone', Event :: _, State :: _, NextState :: _}
+ | {'consume', Event :: _, State :: _, NextState :: _}
+ | {'enter', State :: _}
+ | {'terminate', Reason :: _, State :: _}
+ | term().
-opaque dbg_opt() :: {'trace', 'true'}
| {'log',
{N :: non_neg_integer(),
@@ -385,31 +393,41 @@ handle_system_msg(SysState, Msg, From, Parent, Mod, Debug, Misc, Hib) ->
FormFunc :: format_fun(),
Extra :: term(),
Event :: system_event().
-handle_debug([{trace, true} | T], FormFunc, State, Event) ->
+handle_debug([{trace, true} = DbgOpt | T], FormFunc, State, Event) ->
print_event({Event, State, FormFunc}),
- [{trace, true} | handle_debug(T, FormFunc, State, Event)];
-handle_debug([{log, {N, LogData}} | T], FormFunc, State, Event) ->
- NLogData = [{Event, State, FormFunc} | trim(N, LogData)],
- [{log, {N, NLogData}} | handle_debug(T, FormFunc, State, Event)];
-handle_debug([{log_to_file, Fd} | T], FormFunc, State, Event) ->
+ [DbgOpt | handle_debug(T, FormFunc, State, Event)];
+handle_debug([{log, NLog} | T], FormFunc, State, Event) ->
+ Item = {Event, State, FormFunc},
+ [{log, nlog_put(Item, NLog)} | handle_debug(T, FormFunc, State, Event)];
+handle_debug([{log_to_file, Fd} = DbgOpt | T], FormFunc, State, Event) ->
print_event(Fd, {Event, State, FormFunc}),
- [{log_to_file, Fd} | handle_debug(T, FormFunc, State, Event)];
+ [DbgOpt | handle_debug(T, FormFunc, State, Event)];
handle_debug([{statistics, StatData} | T], FormFunc, State, Event) ->
NStatData = stat(Event, StatData),
[{statistics, NStatData} | handle_debug(T, FormFunc, State, Event)];
handle_debug([{FuncId, {Func, FuncState}} | T], FormFunc, State, Event) ->
- case catch Func(FuncState, Event, State) of
+ try Func(FuncState, Event, State) of
done -> handle_debug(T, FormFunc, State, Event);
- {'EXIT', _} -> handle_debug(T, FormFunc, State, Event);
NFuncState ->
- [{FuncId, {Func, NFuncState}} | handle_debug(T, FormFunc, State, Event)]
+ [{FuncId, {Func, NFuncState}} |
+ handle_debug(T, FormFunc, State, Event)]
+ catch
+ done -> handle_debug(T, FormFunc, State, Event);
+ NFuncState ->
+ [{FuncId, {Func, NFuncState}} |
+ handle_debug(T, FormFunc, State, Event)];
+ _:_ -> handle_debug(T, FormFunc, State, Event)
end;
handle_debug([{Func, FuncState} | T], FormFunc, State, Event) ->
- case catch Func(FuncState, Event, State) of
+ try Func(FuncState, Event, State) of
done -> handle_debug(T, FormFunc, State, Event);
- {'EXIT', _} -> handle_debug(T, FormFunc, State, Event);
- NFuncState ->
+ NFuncState ->
[{Func, NFuncState} | handle_debug(T, FormFunc, State, Event)]
+ catch
+ done -> handle_debug(T, FormFunc, State, Event);
+ NFuncState ->
+ [{Func, NFuncState} | handle_debug(T, FormFunc, State, Event)];
+ _:_ -> handle_debug(T, FormFunc, State, Event)
end;
handle_debug([], _FormFunc, _State, _Event) ->
[].
@@ -526,19 +544,19 @@ debug_cmd({trace, true}, Debug) ->
debug_cmd({trace, false}, Debug) ->
{ok, remove_debug(trace, Debug)};
debug_cmd({log, true}, Debug) ->
- {_N, Logs} = get_debug(log, Debug, {0, []}),
- {ok, install_debug(log, {10, trim(10, Logs)}, Debug)};
-debug_cmd({log, {true, N}}, Debug) when is_integer(N), N > 0 ->
- {_N, Logs} = get_debug(log, Debug, {0, []}),
- {ok, install_debug(log, {N, trim(N, Logs)}, Debug)};
+ NLog = get_debug(log, Debug, nlog_new()),
+ {ok, install_debug(log, nlog_new(NLog), Debug)};
+debug_cmd({log, {true, N}}, Debug) when is_integer(N), 1 =< N ->
+ NLog = get_debug(log, Debug, nlog_new(N)),
+ {ok, install_debug(log, nlog_new(N, NLog), Debug)};
debug_cmd({log, false}, Debug) ->
{ok, remove_debug(log, Debug)};
debug_cmd({log, print}, Debug) ->
print_log(Debug),
{ok, Debug};
debug_cmd({log, get}, Debug) ->
- {_N, Logs} = get_debug(log, Debug, {0, []}),
- {{ok, lists:reverse(Logs)}, Debug};
+ NLog = get_debug(log, Debug, nlog_new()),
+ {{ok, [Event || {Event, _State, _FormFunc} <- nlog_get(NLog)]}, Debug};
debug_cmd({log_to_file, false}, Debug) ->
NDebug = close_log_file(Debug),
{ok, NDebug};
@@ -595,9 +613,6 @@ stat({out, _Msg, _To}, {Time, Reds, In, Out}) -> {Time, Reds, In, Out+1};
stat({out, _Msg, _To, _State}, {Time, Reds, In, Out}) -> {Time, Reds, In, Out+1};
stat(_, StatData) -> StatData.
-trim(N, LogData) ->
- lists:sublist(LogData, 1, N-1).
-
%%-----------------------------------------------------------------
%% Debug structure manipulating functions
%%-----------------------------------------------------------------
@@ -625,9 +640,14 @@ get_debug2(Item, Debug, Default) ->
-spec print_log(Debug) -> 'ok' when
Debug :: [dbg_opt()].
print_log(Debug) ->
- {_N, Logs} = get_debug(log, Debug, {0, []}),
- lists:foreach(fun print_event/1,
- lists:reverse(Logs)).
+ NLog = get_debug(log, Debug, nlog_new()),
+ lists:foreach(fun print_event/1, nlog_get(NLog)).
+
+-spec get_log(Debug) -> [system_event()] when
+ Debug :: [dbg_opt()].
+get_log(Debug) ->
+ NLog = get_debug(log, Debug, nlog_new()),
+ [Event || {Event, _State, _FormFunc} <- nlog_get(NLog)].
close_log_file(Debug) ->
case get_debug2(log_to_file, Debug, []) of
@@ -639,6 +659,74 @@ close_log_file(Debug) ->
end.
%%-----------------------------------------------------------------
+%% Keep the last N Log functions
+%%-----------------------------------------------------------------
+%%
+%% Streamlined Okasaki queue as base for "keep the last N" log.
+%%
+%% To the reverse list head we cons new items.
+%% The forward list contains elements in insertion order,
+%% so the head is the oldest and the one to drop off
+%% when the log is full.
+%%
+%% Here is how we can get away with only using one cons cell
+%% to wrap the forward and reverse list, and the log size:
+%%
+%% A full log does not need a counter; we just cons one
+%% and drop one:
+%%
+%% [ReverseList|ForwardList]
+%%
+%% A non-full log is filling up to N elements;
+%% use a down counter instead of a list as first element:
+%%
+%% [RemainingToFullCount|ReverseList]
+
+nlog_new() ->
+ nlog_new(10).
+%%
+nlog_new([_|_] = NLog) ->
+ nlog_new(10, NLog);
+nlog_new(N) ->
+ [N]. % Empty log size N >= 1
+%%
+nlog_new(N, NLog) ->
+ lists:foldl(
+ fun (Item, NL) -> nlog_put(Item, NL) end,
+ nlog_new(N),
+ nlog_get(NLog)).
+
+%%
+nlog_put(Item, NLog) ->
+ case NLog of
+ [R|FF] when is_list(R) ->
+ %% Full log
+ case FF of
+ [_|F] ->
+ %% Cons to reverse list, drop from forward list
+ [[Item|R]|F];
+ [] ->
+ %% Create new forward list from reverse list,
+ %% create new empty reverse list
+ [_|F] = lists:reverse(R, [Item]),
+ [[]|F]
+ end;
+ [1|R] ->
+ %% Log now gets full
+ [[Item|R]];
+ [J|R] ->
+ %% Filling up to N elements
+ [J - 1,Item|R]
+ end.
+
+nlog_get([[]|F]) ->
+ F;
+nlog_get([[_|_] = R|F]) ->
+ F ++ lists:reverse(R);
+nlog_get([_J|R]) ->
+ lists:reverse(R).
+
+%%-----------------------------------------------------------------
%% Func: debug_options/1
%% Purpose: Initiate a debug structure. Called by a process that
%% wishes to initiate the debug structure without the
@@ -665,9 +753,9 @@ debug_options(Options) ->
debug_options([trace | T], Debug) ->
debug_options(T, install_debug(trace, true, Debug));
debug_options([log | T], Debug) ->
- debug_options(T, install_debug(log, {10, []}, Debug));
+ debug_options(T, install_debug(log, nlog_new(), Debug));
debug_options([{log, N} | T], Debug) when is_integer(N), N > 0 ->
- debug_options(T, install_debug(log, {N, []}, Debug));
+ debug_options(T, install_debug(log, nlog_new(N), Debug));
debug_options([statistics | T], Debug) ->
debug_options(T, install_debug(statistics, init_stat(), Debug));
debug_options([{log_to_file, FileName} | T], Debug) ->
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 22:44:07 +0000