%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012-2016. 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(dyntrace_SUITE).
-include_lib("common_test/include/ct.hrl").
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1]).
%% Test cases
-export([smoke/1,process/1]).
suite() ->
[{ct_hooks,[ts_install_cth]},
{timetrap, {minutes, 1}}].
all() ->
case erlang:system_info(dynamic_trace) of
none ->
{skip,"No dynamic trace in this run-time system"};
dtrace ->
[{group,smoke}];
systemtap ->
{skip,"SystemTap tests currently not supported"};
lttng ->
{skip,"LTTng tests currently not supported"}
end.
groups() ->
[{smoke,[sequence],[smoke,{group,rest}]},
{rest,[],
[process]}].
init_per_suite(Config) ->
N = "beam" ++
case erlang:system_info(debug_compiled) of
false -> "";
true -> ".debug"
end ++ ".smp",
[{emu_name,N}|Config].
end_per_suite(_Config) ->
ok.
smoke(Config) ->
Emu = test_server:lookup_config(emu_name, Config),
BinEmu = list_to_binary(Emu),
case erlang:system_info(dynamic_trace) of
dtrace ->
Probes = os:cmd("sudo /usr/sbin/dtrace -l -m" ++ Emu),
io:put_chars(Probes),
[_|Lines] = re:split(Probes, "\n", [trim]),
[{_,_} = binary:match(L, BinEmu) || L <- Lines],
ok
end,
%% Test that the framework for running dtrace/systemtap works
%% by executing an empty script.
{ok,[]} = dyntrace("", fun() -> ok end),
ok.
process(_Config) ->
Script = [{probe,"process-spawn"},
{action,[{printf,["spawn %s %s\n",{arg,0},{arg,1}]}]},
{probe,"process-scheduled"},
{action,[{printf,["in %s\n",{arg,0}]}]},
{probe,"process-unscheduled"},
{action,[{printf,["out %s\n",{arg,0}]}]},
{probe,"process-hibernate"},
{action,[{printf,["hibernate %s %s\n",{arg,0},{arg,1}]}]},
{probe,"process-exit"},
{action,[{printf,["exit %s %s\n",{arg,0},{arg,1}]}]}],
F = fun() ->
{Pid,Ref} = spawn_monitor(fun my_process/0),
Pid ! hibernate,
Pid ! quit,
receive
{'DOWN',Ref,process,Pid,{terminated,Pid}} ->
ok
end,
Pid
end,
{Pid,Output0} = dyntrace(Script, F),
Output1 = [termify_line(L) || L <- Output0],
PidStr = pid_to_list(Pid),
Output = [L || L <- Output1, element(2, L) =:= PidStr],
Reason = "{terminated,"++PidStr++"}",
io:format("~p\n", [Output]),
[{spawn,PidStr,"erlang:apply/2"},
{in,PidStr},
{hibernate,PidStr,"erlang:apply/2"},
{out,PidStr},
{in,PidStr},
{exit,PidStr,Reason},
{out,PidStr}] = Output,
ok.
termify_line(L) ->
[H|T] = re:split(L, " ", [{return,list}]),
list_to_tuple([list_to_atom(H)|T]).
my_process() ->
receive
hibernate ->
erlang:hibernate(erlang, apply, [fun my_process/0,[]]);
quit ->
exit({terminated,self()})
end.
%%%
%%% Utility functions.
%%%
dyntrace(Script0, Action) ->
Sudo = os:find_executable(sudo),
{Termination,Pid} = termination_probe(),
Script1 = Script0++Termination,
Script = translate_script(Script1),
io:format("~s\n", [Script]),
SrcFile = "test-dyntrace.d",
ok = file:write_file(SrcFile, Script),
Args = ["/usr/sbin/dtrace", "-q","-s",SrcFile],
Port = open_port({spawn_executable,Sudo},
[{args,Args},stream,in,stderr_to_stdout,eof]),
receive
{Port,{data,Sofar}} ->
Res = Action(),
Pid ! quit,
{Res,get_data(Port, Sofar)}
end.
get_data(Port, Sofar) ->
receive
{Port,{data,Bytes}} ->
get_data(Port, [Sofar|Bytes]);
{Port,eof} ->
port_close(Port),
[$\n|T] = lists:flatten(Sofar),
re:split(T, "\n", [{return,list},trim])
end.
termination_probe() ->
Pid = spawn(fun() ->
receive
_ ->
exit(done)
end
end),
S = [{'BEGIN',[{printf,["\n"]}]},
{probe,"process-exit"},
{pred,{'==',{arg,0},Pid}},
{action,[{exit,[0]}]}],
{S,Pid}.
translate_script(Script) ->
[dtrace_op(Op) || Op <- Script].
dtrace_op({probe,Function}) ->
OsPid = os:getpid(),
["erlang",OsPid,":::",Function,$\n];
dtrace_op({pred,Pred}) ->
["/",dtrace_op(Pred),"/\n"];
dtrace_op({action,List}) ->
["{ ",action_list(List)," }\n\n"];
dtrace_op({'BEGIN',List}) ->
["BEGIN { ",action_list(List)," }\n\n"];
dtrace_op({'==',Op1,Op2}) ->
[dtrace_op(Op1)," == ",dtrace_op(Op2)];
dtrace_op({arg,N}) ->
["copyinstr(arg",integer_to_list(N),")"];
dtrace_op({Func,List}) when is_atom(Func), is_list(List) ->
[atom_to_list(Func),"(",comma_sep_ops(List),")"];
dtrace_op(Pid) when is_pid(Pid) ->
["\"",pid_to_list(Pid),"\""];
dtrace_op(Str) when is_integer(hd(Str)) ->
io_lib:format("~p", [Str]);
dtrace_op(Int) when is_integer(Int) ->
integer_to_list(Int).
comma_sep_ops([A,B|T]) ->
[dtrace_op(A),","|comma_sep_ops([B|T])];
comma_sep_ops([H]) ->
dtrace_op(H);
comma_sep_ops([]) -> [].
action_list([H|T]) ->
[dtrace_op(H),";"|action_list(T)];
action_list([]) -> [].
