aboutsummaryrefslogtreecommitdiffstats
path: root/lib/kernel/test/seq_trace_SUITE.erl
blob: 3bbf62e83208c2835a488ae6ea030edce0d7eb83 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2018. 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(seq_trace_SUITE).

%% label_capability_mismatch needs to run a part of the test on an OTP 20 node.
-compile(r20).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	 init_per_group/2,end_per_group/2,
	 init_per_testcase/2,end_per_testcase/2]).
-export([token_set_get/1, tracer_set_get/1, print/1,
	 send/1, distributed_send/1, recv/1, distributed_recv/1,
	 trace_exit/1, distributed_exit/1, call/1, port/1,
	 match_set_seq_token/1, gc_seq_token/1, label_capability_mismatch/1]).

%% internal exports
-export([simple_tracer/2, one_time_receiver/0, one_time_receiver/1,
	 start_tracer/0, stop_tracer/1, 
	 do_match_set_seq_token/1, do_gc_seq_token/1, countdown_start/2]).

-include_lib("common_test/include/ct.hrl").

-define(TIMESTAMP_MODES, [no_timestamp,
			  timestamp,
			  monotonic_timestamp,
			  strict_monotonic_timestamp]).

suite() ->
    [{ct_hooks,[ts_install_cth]},
     {timetrap,{minutes,1}}].

all() -> 
    [token_set_get, tracer_set_get, print, send,
     distributed_send, recv, distributed_recv, trace_exit,
     distributed_exit, call, port, match_set_seq_token,
     gc_seq_token, label_capability_mismatch].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.


init_per_testcase(_Case, Config) ->
    Config.

end_per_testcase(_Case, _Config) ->
    ok.

%% Verifies that the set_token and get_token functions work as expected

token_set_get(Config) when is_list(Config) ->
    do_token_set_get(timestamp),
    do_token_set_get(monotonic_timestamp),
    do_token_set_get(strict_monotonic_timestamp).
    
do_token_set_get(TsType) ->
    io:format("Testing ~p~n", [TsType]),
    Flags = case TsType of
		timestamp -> 15;
		strict_monotonic_timestamp -> 23;
		monotonic_timestamp -> 39
	    end,
    Self = self(),
    seq_trace:reset_trace(),
    %% Test that initial seq_trace is disabled
    [] = seq_trace:get_token(),
    %% Test setting and reading the different fields
    0 = seq_trace:set_token(label,{my_label,1}),
    {label,{my_label,1}} = seq_trace:get_token(label),
    false = seq_trace:set_token(print,true),
    {print,true} = seq_trace:get_token(print),
    false = seq_trace:set_token(send,true),
    {send,true} = seq_trace:get_token(send),
    false = seq_trace:set_token('receive',true),
    {'receive',true} = seq_trace:get_token('receive'),
    false = seq_trace:set_token(TsType,true),
    {TsType,true} = seq_trace:get_token(TsType),
    %% Check the whole token
    {Flags,{my_label,1},0,Self,0} = seq_trace:get_token(), % all flags are set
    %% Test setting and reading the 'serial' field
    {0,0} = seq_trace:set_token(serial,{3,5}),
    {serial,{3,5}} = seq_trace:get_token(serial),
    %% Check the whole token, test that a whole token can be set and get
    {Flags,{my_label,1},5,Self,3} = seq_trace:get_token(),
    seq_trace:set_token({Flags,19,7,Self,5}),
    {Flags,19,7,Self,5} = seq_trace:get_token(),
    %% Check that receive timeout does not reset token
    receive after 0 -> ok end,
    {Flags,19,7,Self,5} = seq_trace:get_token(),
    %% Check that token can be unset
    {Flags,19,7,Self,5} = seq_trace:set_token([]),
    [] = seq_trace:get_token(),
    %% Check that Previous serial counter survived unset token
    0 = seq_trace:set_token(label, 17),
    {0,17,0,Self,5} = seq_trace:get_token(),
    %% Check that reset_trace resets the token and clears
    %% the Previous serial counter
    seq_trace:reset_trace(),
    [] = seq_trace:get_token(),
    0 = seq_trace:set_token(label, 19),
    {0,19,0,Self,0} = seq_trace:get_token(),
    %% Cleanup
    seq_trace:reset_trace(),
    ok.

tracer_set_get(Config) when is_list(Config) ->
    Self = self(),
    seq_trace:set_system_tracer(self()),
    Self = seq_trace:get_system_tracer(),
    Self = seq_trace:set_system_tracer(false),
    false = seq_trace:get_system_tracer(),

    %% Set the system tracer to a port.

    Port = load_tracer(Config),
    seq_trace:set_system_tracer(Port),
    Port = seq_trace:get_system_tracer(),
    Port = seq_trace:set_system_tracer(false),
    false = seq_trace:get_system_tracer(),
    ok.

print(Config) when is_list(Config) ->
    lists:foreach(fun do_print/1, ?TIMESTAMP_MODES).
    
do_print(TsType) ->
    start_tracer(),
    set_token_flags([print, TsType]),
    seq_trace:print(0,print1),
    seq_trace:print(1,print2),
    seq_trace:print(print3),
    seq_trace:reset_trace(),
    [{0,{print,_,_,[],print1}, Ts0},
	   {0,{print,_,_,[],print3}, Ts1}] = stop_tracer(2),
    check_ts(TsType, Ts0),
    check_ts(TsType, Ts1).
    
send(Config) when is_list(Config) ->
    lists:foreach(fun do_send/1, ?TIMESTAMP_MODES).

do_send(TsType) ->
    seq_trace:reset_trace(),
    start_tracer(),
    Receiver = spawn(?MODULE,one_time_receiver,[]),
    Label = make_ref(),
    seq_trace:set_token(label,Label),
    set_token_flags([send, TsType]),
    Receiver ! send,
    Self = self(),
    seq_trace:reset_trace(),
    [{Label,{send,_,Self,Receiver,send}, Ts}] = stop_tracer(1),
    check_ts(TsType, Ts).

distributed_send(Config) when is_list(Config) ->
    lists:foreach(fun do_distributed_send/1, ?TIMESTAMP_MODES).

do_distributed_send(TsType) ->
    {ok,Node} = start_node(seq_trace_other,[]),
    {_,Dir} = code:is_loaded(?MODULE),
    Mdir = filename:dirname(Dir),
    true = rpc:call(Node,code,add_patha,[Mdir]),
    seq_trace:reset_trace(),
    start_tracer(),
    Receiver = spawn(Node,?MODULE,one_time_receiver,[]),

    %% Make sure complex labels survive the trip.
    Label = make_ref(),
    seq_trace:set_token(label,Label),
    set_token_flags([send,TsType]),

    Receiver ! send,
    Self = self(),
    seq_trace:reset_trace(),
    stop_node(Node),
    [{Label,{send,_,Self,Receiver,send}, Ts}] = stop_tracer(1),
    check_ts(TsType, Ts).


recv(Config) when is_list(Config) ->
    lists:foreach(fun do_recv/1, ?TIMESTAMP_MODES).

do_recv(TsType) ->
    seq_trace:reset_trace(),
    start_tracer(),
    Receiver = spawn(?MODULE,one_time_receiver,[]),
    set_token_flags(['receive',TsType]),
    Receiver ! 'receive',
    %% let the other process receive the message:
    receive after 1 -> ok end,
    Self = self(),
    seq_trace:reset_trace(),
    [{0,{'receive',_,Self,Receiver,'receive'}, Ts}] = stop_tracer(1),
    check_ts(TsType, Ts).

distributed_recv(Config) when is_list(Config) ->
    lists:foreach(fun do_distributed_recv/1, ?TIMESTAMP_MODES).

do_distributed_recv(TsType) ->
    {ok,Node} = start_node(seq_trace_other,[]),
    {_,Dir} = code:is_loaded(?MODULE),
    Mdir = filename:dirname(Dir),
    true = rpc:call(Node,code,add_patha,[Mdir]),
    seq_trace:reset_trace(),
    rpc:call(Node,?MODULE,start_tracer,[]),
    Receiver = spawn(Node,?MODULE,one_time_receiver,[]),

    %% Make sure complex labels survive the trip.
    Label = make_ref(),
    seq_trace:set_token(label,Label),
    set_token_flags(['receive',TsType]),

    Receiver ! 'receive',
    %% let the other process receive the message:
    receive after 1 -> ok end,
    Self = self(),
    seq_trace:reset_trace(),
    Result = rpc:call(Node,?MODULE,stop_tracer,[1]),
    stop_node(Node),
    ok = io:format("~p~n",[Result]),
    [{Label,{'receive',_,Self,Receiver,'receive'}, Ts}] = Result,
    check_ts(TsType, Ts).

trace_exit(Config) when is_list(Config) ->
    lists:foreach(fun do_trace_exit/1, ?TIMESTAMP_MODES).

do_trace_exit(TsType) ->
    seq_trace:reset_trace(),
    start_tracer(),
    Receiver = spawn_link(?MODULE, one_time_receiver, [exit]),
    process_flag(trap_exit, true),

    %% Make sure complex labels survive the trip.
    Label = make_ref(),
    seq_trace:set_token(label,Label),
    set_token_flags([send, TsType]),

    Receiver ! {before, exit},
    %% let the other process receive the message:
    receive
	      {'EXIT', Receiver, {exit, {before, exit}}} ->
		  seq_trace:set_token([]);
	      Other ->
		  seq_trace:set_token([]),
		  ct:fail({received, Other})
	  end,
    Self = self(),
    Result = stop_tracer(2),
    seq_trace:reset_trace(),
    ok = io:format("~p~n", [Result]),
    [{Label, {send, {0,1}, Self, Receiver, {before, exit}}, Ts0},
	   {Label, {send, {1,2}, Receiver, Self,
	       {'EXIT', Receiver, {exit, {before, exit}}}}, Ts1}] = Result,
    check_ts(TsType, Ts0),
    check_ts(TsType, Ts1).

distributed_exit(Config) when is_list(Config) ->
    lists:foreach(fun do_distributed_exit/1, ?TIMESTAMP_MODES).

do_distributed_exit(TsType) ->
    {ok, Node} = start_node(seq_trace_other, []),
    {_, Dir} = code:is_loaded(?MODULE),
    Mdir = filename:dirname(Dir),
    true = rpc:call(Node, code, add_patha, [Mdir]),
    seq_trace:reset_trace(),
    rpc:call(Node, ?MODULE, start_tracer,[]),
    Receiver = spawn_link(Node, ?MODULE, one_time_receiver, [exit]),
    process_flag(trap_exit, true),
    set_token_flags([send, TsType]),
    Receiver ! {before, exit},
    %% let the other process receive the message:
    receive
	      {'EXIT', Receiver, {exit, {before, exit}}} ->
		  seq_trace:set_token([]);
	      Other ->
		  seq_trace:set_token([]),
		  ct:fail({received, Other})
	  end,
    Self = self(),
    Result = rpc:call(Node, ?MODULE, stop_tracer, [1]),
    seq_trace:reset_trace(),
    stop_node(Node),
    ok = io:format("~p~n", [Result]),
    [{0, {send, {1, 2}, Receiver, Self,
		{'EXIT', Receiver, {exit, {before, exit}}}}, Ts}] = Result,
    check_ts(TsType, Ts).

label_capability_mismatch(Config) when is_list(Config) ->
    Releases = ["20_latest"],
    Available = [Rel || Rel <- Releases, test_server:is_release_available(Rel)],
    case Available of
        [] -> {skipped, "No incompatible releases available"};
        _ ->
            lists:foreach(fun do_incompatible_labels/1, Available),
            lists:foreach(fun do_compatible_labels/1, Available),
            ok
    end.

do_incompatible_labels(Rel) ->
    Cookie = atom_to_list(erlang:get_cookie()),
    {ok, Node} = test_server:start_node(
        list_to_atom(atom_to_list(?MODULE)++"_"++Rel), peer,
        [{args, " -setcookie "++Cookie}, {erl, [{release, Rel}]}]),

    {_,Dir} = code:is_loaded(?MODULE),
    Mdir = filename:dirname(Dir),
    true = rpc:call(Node,code,add_patha,[Mdir]),
    seq_trace:reset_trace(),
    true = is_pid(rpc:call(Node,?MODULE,start_tracer,[])),
    Receiver = spawn(Node,?MODULE,one_time_receiver,[]),

    %% This node does not support arbitrary labels, so it must fail with a
    %% timeout as the token is dropped silently.
    seq_trace:set_token(label,make_ref()),
    seq_trace:set_token('receive',true),

    Receiver ! 'receive',
    %% let the other process receive the message:
    receive after 10 -> ok end,
    seq_trace:reset_trace(),

    {error,timeout} = rpc:call(Node,?MODULE,stop_tracer,[1]),
    stop_node(Node),
    ok.

do_compatible_labels(Rel) ->
    Cookie = atom_to_list(erlang:get_cookie()),
    {ok, Node} = test_server:start_node(
        list_to_atom(atom_to_list(?MODULE)++"_"++Rel), peer,
        [{args, " -setcookie "++Cookie}, {erl, [{release, Rel}]}]),

    {_,Dir} = code:is_loaded(?MODULE),
    Mdir = filename:dirname(Dir),
    true = rpc:call(Node,code,add_patha,[Mdir]),
    seq_trace:reset_trace(),
    true = is_pid(rpc:call(Node,?MODULE,start_tracer,[])),
    Receiver = spawn(Node,?MODULE,one_time_receiver,[]),

    %% This node does not support arbitrary labels, but small integers should
    %% still work.
    Label = 1234,
    seq_trace:set_token(label,Label),
    seq_trace:set_token('receive',true),

    Receiver ! 'receive',
    %% let the other process receive the message:
    receive after 10 -> ok end,
    Self = self(),
    seq_trace:reset_trace(),
    Result = rpc:call(Node,?MODULE,stop_tracer,[1]),
    stop_node(Node),
    ok = io:format("~p~n",[Result]),
    [{Label,{'receive',_,Self,Receiver,'receive'}, _}] = Result,
    ok.

call(doc) -> 
    "Tests special forms {is_seq_trace} and {get_seq_token} "
	"in trace match specs.";
call(Config) when is_list(Config) ->
    Self = self(),
    seq_trace:reset_trace(),
    TrA = transparent_tracer(),
    1 =
	erlang:trace(Self, true, 
		     [call, set_on_spawn, {tracer, TrA(pid)}]),
    1 =
	erlang:trace_pattern({?MODULE, call_tracee_1, 1},
			     [{'_',
			       [],
			       [{message, {{{self}, {get_seq_token}}}}]}],
			     [local]),
    1 =
	erlang:trace_pattern({?MODULE, call_tracee_2, 1},
			     [{'_',
			      [{is_seq_trace}],
			      [{message, {{{self}, {get_seq_token}}}}]}],
			     [local]),
    RefA = make_ref(),
    Pid2A = spawn_link(
		    fun() ->
			    receive {_, msg, RefA} -> ok end,
			    RefA = call_tracee_2(RefA),
			    Self ! {self(), msg, RefA}
		   end),
    Pid1A = spawn_link(
		    fun() ->
			    receive {_, msg, RefA} -> ok end,
			    RefA = call_tracee_1(RefA),
			    Pid2A ! {self(), msg, RefA}
		    end),
    Pid1A ! {Self, msg, RefA},
    %% The message is passed Self -> Pid1B -> Pid2B -> Self.
    %% Traced functions are called in Pid1B and Pid2B. 
    receive {Pid2A, msg, RefA} -> ok end,
    %% Only call_tracee1 will be traced since the guard for 
    %% call_tracee2 requires a sequential trace. The trace
    %% token is undefined.
    Token2A = [],
    {ok, [{trace, Pid1A, call,
		 {?MODULE, call_tracee_1, [RefA]},
		 {Pid1A, Token2A}}]} = 
	TrA({stop, 1}),

    seq_trace:reset_trace(),

    TrB = transparent_tracer(),
    1 =
	erlang:trace(Self, true, 
		     [call, set_on_spawn, {tracer, TrB(pid)}]),
    Label = 17,
    seq_trace:set_token(label, Label), % Token enters here!!
    RefB = make_ref(),
    Pid2B = spawn_link(
		    fun() ->
			    receive {_, msg, RefB} -> ok end,
			    RefB = call_tracee_2(RefB),
			    Self ! {self(), msg, RefB}
		   end),
    Pid1B = spawn_link(
		    fun() ->
			    receive {_, msg, RefB} -> ok end,
			    RefB = call_tracee_1(RefB),
			    Pid2B ! {self(), msg, RefB}
		    end),
    Pid1B ! {Self, msg, RefB},
    %% The message is passed Self -> Pid1B -> Pid2B -> Self, and the 
    %% seq_trace token follows invisibly. Traced functions are 
    %% called in Pid1B and Pid2B. Seq_trace flags == 0 so no
    %% seq_trace messages are generated.
    receive {Pid2B, msg, RefB} -> ok end,
    %% The values of these counters {.., 1, _, 0}, {.., 2, _, 1}
    %% depend on that seq_trace has been reset just before this test.
    Token1B = {0, Label, 1, Self, 0},
    Token2B = {0, Label, 2, Pid1B, 1},
    {ok, [{trace, Pid1B, call,
		 {?MODULE, call_tracee_1, [RefB]},
		 {Pid1B, Token1B}},
		{trace, Pid2B, call, 
		 {?MODULE, call_tracee_2, [RefB]},
		 {Pid2B, Token2B}}]} =
	TrB({stop,2}),
    seq_trace:reset_trace(),
    ok.

%% Send trace messages to a port.
port(Config) when is_list(Config) ->
    lists:foreach(fun (TsType) -> do_port(TsType, Config) end,
		  ?TIMESTAMP_MODES).

do_port(TsType, Config) ->
    io:format("Testing ~p~n",[TsType]),
    Port = load_tracer(Config),
    seq_trace:set_system_tracer(Port),

    set_token_flags([print, TsType]),
    Small = [small,term],
    seq_trace:print(0, Small),
    case get_port_message(Port) of
	      {seq_trace,0,{print,_,_,[],Small}} when TsType == no_timestamp ->
		  ok;
	      {seq_trace,0,{print,_,_,[],Small},Ts0} when TsType /= no_timestamp ->
		  check_ts(TsType, Ts0),
		  ok;
	      Other ->
		  seq_trace:reset_trace(),
		  ct:fail({unexpected,Other})
	  end,
    %% OTP-4218 Messages from ports should not affect seq trace token.
    %%
    %% Check if trace token still is active on this process after
    %% the get_port_message/1 above that receives from a port.
    OtherSmall = [other | Small],
    seq_trace:print(0, OtherSmall),
    seq_trace:reset_trace(),
    case get_port_message(Port) of
	      {seq_trace,0,{print,_,_,[],OtherSmall}} when TsType == no_timestamp ->
		  ok;
	      {seq_trace,0,{print,_,_,[],OtherSmall}, Ts1} when TsType /= no_timestamp ->
		  check_ts(TsType, Ts1),
		  ok;
	      Other1 ->
		  ct:fail({unexpected,Other1})
	  end,


    seq_trace:set_token(print, true),
    Huge = huge_data(),
    seq_trace:print(0, Huge),
    seq_trace:reset_trace(),
    case get_port_message(Port) of
	      {seq_trace,0,{print,_,_,[],Huge}} ->
		  ok;
	      Other2 ->
		  ct:fail({unexpected,Other2})
	  end,
    unlink(Port),
    exit(Port,kill),
    ok.

get_port_message(Port) ->
    receive
	{Port,{data,Bin}} when is_binary(Bin) ->
	    binary_to_term(Bin);
	Other ->
	    ct:fail({unexpected,Other})
    after 5000 ->
	    ct:fail(timeout)
    end.



match_set_seq_token(doc) ->
    ["Tests that match spec function set_seq_token does not "
     "corrupt the heap"];
match_set_seq_token(Config) when is_list(Config) ->
    Parent = self(),

    %% OTP-4222 Match spec 'set_seq_token' corrupts heap
    %%
    %% This test crashes the emulator if the bug in question is present,
    %% it is therefore done in a slave node.
    %%
    %% All the timeout stuff is here to get decent accuracy of the error
    %% return value, instead of just 'timeout'.
    %%
    {ok, Sandbox} = start_node(seq_trace_other, []),
    true = rpc:call(Sandbox, code, add_patha,
			  [filename:dirname(code:which(?MODULE))]),
    Lbl = 4711,
    %% Do the possibly crashing test
    P1 =
	spawn(
	  fun () ->
		  Parent ! {self(),
			    rpc:call(Sandbox, 
				     ?MODULE, do_match_set_seq_token, [Lbl])}
	  end),
    %% Probe the node with a simple rpc request, to see if it is alive.
    P2 =
	spawn(
	  fun () ->
		  receive after 4000 -> ok end,
		  Parent ! {self(), rpc:call(Sandbox, erlang, abs, [-1])}
	  end),
    %% If the test node hangs completely, this timer expires.
    R3 = erlang:start_timer(8000, self(), void),
    %%
    {ok, Log} =
	receive
	    {P1, Result} ->
		exit(P2, done),
		erlang:cancel_timer(R3),
		Result;
	    {P2, 1} ->
		exit(P1, timeout),
		erlang:cancel_timer(R3),
		{error, "Test process hung"};
	    {timeout, R3, _} ->
		exit(P1, timeout),
		exit(P2, timeout),
		{error, "Test node hung"}
	end,

    %% Sort the log on Pid, as events from different processes
    %% are not guaranteed to arrive in a certain order to the
    %% tracer
    SortedLog = lists:keysort(2, Log),

    ok = check_match_set_seq_token_log(Lbl, SortedLog),
    %%
    stop_node(Sandbox),
    ok.

%% OTP-4222 Match spec 'set_seq_token' corrupts heap
%%
%% The crashing test goes as follows:
%%
%% One trigger function calls match spec function {set_seq_token, _, _},
%% which when faulty corrupts the heap. It is assured that the process
%% in question has a big heap and recently garbage collected so there 
%% will be room on the heap, which is necessary for the crash to happen.
%%
%% Then two processes bounces a few messages between each other, and if
%% the heap is crashed the emulator crashes, or the triggering process's
%% loop data gets corrupted so the loop never ends.
do_match_set_seq_token(Label) ->
    seq_trace:reset_trace(),
    Tr = transparent_tracer(),
    TrPid = Tr(pid),
    erlang:trace_pattern({?MODULE, '_', '_'}, 
			 [{'_', 
			   [{is_seq_trace}], 
			   [{message, {get_seq_token}}]}], 
			 [local]),
    erlang:trace_pattern({?MODULE, countdown, 2}, 
			 [{'_', 
			   [], 
			   [{set_seq_token, label, Label},
			    {message, {get_seq_token}}]}],
			 [local]),
    erlang:trace(new, true, [call, {tracer, TrPid}]),
    Ref = make_ref(),
    Bounce = spawn(fun () -> bounce(Ref) end),
    Mref = erlang:monitor(process, Bounce),
    _Countdown = erlang:spawn_opt(?MODULE, countdown_start, [Bounce, Ref],
				 [{min_heap_size, 4192}]),
    receive 
	{'DOWN', Mref, _, _, normal} -> 
	    Result = Tr({stop, 0}),
	    seq_trace:reset_trace(),
	    erlang:trace(new, false, [call]),
	    Result;
	{'DOWN', Mref, _, _, Reason} ->
	    Tr({stop, 0}),
	    seq_trace:reset_trace(),
	    erlang:trace(new, false, [call]),
	    {error, Reason}
    end.

check_match_set_seq_token_log(
  Label,
  [{trace,B,call,{?MODULE,bounce,   [Ref]},    {0,Label,2,B,1}},
   {trace,B,call,{?MODULE,bounce,   [Ref]},    {0,Label,4,B,3}},
   {trace,B,call,{?MODULE,bounce,   [Ref]},    {0,Label,6,B,5}},
   {trace,C,call,{?MODULE,countdown,[B,Ref]},  {0,Label,0,C,0}},
   {trace,C,call,{?MODULE,countdown,[B,Ref,3]},{0,Label,0,C,0}},
   {trace,C,call,{?MODULE,countdown,[B,Ref,2]},{0,Label,2,B,1}},
   {trace,C,call,{?MODULE,countdown,[B,Ref,1]},{0,Label,4,B,3}},
   {trace,C,call,{?MODULE,countdown,[B,Ref,0]},{0,Label,6,B,5}}
  ]) ->
    ok;
check_match_set_seq_token_log(_Label, Log) ->
    {error, Log}.

countdown_start(Bounce, Ref) ->
    %% This gc and the increased heap size of this process ensures that
    %% the match spec executed for countdown/2 has got heap space for
    %% the trace token, so the heap gets trashed according to OTP-4222.
    erlang:garbage_collect(),
    countdown(Bounce, Ref).

countdown(Bounce, Ref) ->
    countdown(Bounce, Ref, 3).

countdown(Bounce, Ref, 0) ->
    Bounce ! Ref;
countdown(Bounce, Ref, Cnt) ->
    Tag = make_ref(),
    Bounce ! {Ref, self(), {Tag, Cnt}},
    receive {Tag, Cnt} -> countdown(Bounce, Ref, Cnt-1) end.

bounce(Ref) ->
    receive 
	Ref ->
	    ok;
	{Ref, Dest, Msg} ->
	    Dest ! Msg,
	    bounce(Ref)
    end.



gc_seq_token(doc) ->
    ["Tests that a seq_trace token on a message in the inqueue ",
     "can be garbage collected."];
gc_seq_token(Config) when is_list(Config) ->
    Parent = self(),

    %% OTP-4555 Seq trace token causes free mem read in gc
    %%
    %% This test crashes the emulator if the bug in question is present,
    %% it is therefore done in a slave node.
    %%
    %% All the timeout stuff is here to get decent accuracy of the error
    %% return value, instead of just 'timeout'.
    %%
    {ok, Sandbox} = start_node(seq_trace_other, []),
    true = rpc:call(Sandbox, code, add_patha,
			  [filename:dirname(code:which(?MODULE))]),
    Label = 4711,
    %% Do the possibly crashing test
    P1 =
	spawn(
	  fun () ->
 		  Parent ! {self(),
			    rpc:call(Sandbox, 
				     ?MODULE, do_gc_seq_token, [Label])}
	  end),
    %% Probe the node with a simple rpc request, to see if it is alive.
    P2 =
	spawn(
	  fun () ->
		  receive after 4000 -> ok end,
		  Parent ! {self(), rpc:call(Sandbox, erlang, abs, [-1])}
	  end),
    %% If the test node hangs completely, this timer expires.
    R3 = erlang:start_timer(8000, self(), void),
    %%
    ok =
	receive
	    {P1, Result} ->
		exit(P2, done),
		erlang:cancel_timer(R3),
		Result;
	    {P2, 1} ->
		exit(P1, timeout),
		erlang:cancel_timer(R3),
		{error, "Test process hung"};
	    {timeout, R3, _} ->
		exit(P1, timeout),
		exit(P2, timeout),
		{error, "Test node hung"}
	end,
    %%
    stop_node(Sandbox),
    ok.

do_gc_seq_token(Label) ->
    Parent = self(),
    Comment =       
	{"OTP-4555 Seq trace token causes free mem read in gc\n"
	 "\n"
	 "The crashing test goes as follows:\n"
	 "\n"
	 "Put a message with seq_trace token in the inqueue,\n"
	 "Grow the process heap big enough to become mmap'ed\n"
	 "and force a garbage collection using large terms\n"
	 "to get a test_heap instruction with a big size value.\n"
	 "Then try to trick the heap into shrinking.\n"
	 "\n"
	 "All this to make the GC move the heap between memory blocks.\n"},
    seq_trace:reset_trace(),
    Child = spawn_link(
	      fun() ->
		      receive {Parent, no_seq_trace_token} -> ok end,
		      do_grow(Comment, 256*1024, []),
		      do_shrink(10),
		      receive {Parent, seq_trace_token} -> ok end,
		      Parent ! {self(), {token, seq_trace:get_token(label)}}
	      end),
    seq_trace:set_token(label, Label),
    Child ! {Parent, seq_trace_token},
    seq_trace:set_token([]),
    Child ! {Parent, no_seq_trace_token},
    receive 
	{Child, {token, {label, Label}}} -> 
	    ok;
	{Child, {token, Other}} ->
	    {error, Other}
    end.

do_grow(_, 0, Acc) ->
    Acc;
do_grow(E, N, Acc) ->
    do_grow(E, N-1, [E | Acc]).

do_shrink(0) ->
    ok;
do_shrink(N) ->
    erlang:garbage_collect(),
    do_shrink(N-1).

%% Test that messages from a port does not clear the token
port_clean_token(Config) when is_list(Config) ->
    seq_trace:reset_trace(),
    Label = make_ref(),
    seq_trace:set_token(label, Label),
    {label,Label} = seq_trace:get_token(label),

    %% Create a port and get messages from it
    %% We use os:cmd as a convenience as it does
    %% open_port, port_command, port_close and receives replies.
    %% Maybe it is not ideal to rely on the internal implementation
    %% of os:cmd but it will have to do.
    os:cmd("ls"),

    %% Make sure that the seq_trace token is still there
    {label,Label} = seq_trace:get_token(label),

    ok.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Internal help functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Call trace targets

call_tracee_1(X) ->
    X.

call_tracee_2(X) ->
    X.


transparent_tracer() ->
    Ref = make_ref(),
    Loop = 
	fun(Fun, Log, LN) ->
		receive
		    {stop, MinLN, Ref, From} when LN >= MinLN ->
			From ! {log, Ref, lists:reverse(Log)};
		    Entry when is_tuple(Entry) == false; element(1, Entry) /= stop ->
			Fun(Fun, [Entry | Log], LN+1)
		end
	end,
    Self = self(),
    Pid = 
	spawn(fun() ->
		      seq_trace:set_system_tracer(self()),
		      Self ! {started, Ref},
		      Loop(Loop, [], 0) 
	      end),
    receive {started, Ref} -> ok end,
    fun(pid) ->
	    Pid;
       ({stop, N}) when is_integer(N), N >= 0 ->
	    Mref = erlang:monitor(process, Pid),
	    receive
		{'DOWN', Mref, _, _, _} ->
		    {error, not_started}
	    after 0 ->
		    DeliverRef = erlang:trace_delivered(all),
		    receive
			{trace_delivered,_,DeliverRef} -> ok
		    end,
		    Pid ! {stop, N, Ref, self()},
		    receive {'DOWN', Mref, _, _, _} -> ok end,
		    receive {log, Ref, Log} -> 
			    {ok, Log} 
		    end
	    end
    end.



one_time_receiver() ->
    receive _Term -> ok
    end.
	
one_time_receiver(exit) ->
    receive Term ->
	    exit({exit, Term}) 
    end.

simple_tracer(Data, DN) ->
    receive
	{seq_trace,Label,Info,Ts} ->
	    simple_tracer([{Label,Info,Ts}|Data], DN+1);
	{seq_trace,Label,Info} ->
	    simple_tracer([{Label,Info, no_timestamp}|Data], DN+1);
	{stop,N,From} when DN >= N ->
	    From ! {tracerlog,lists:reverse(Data)}
    end.

stop_tracer(N) when is_integer(N) ->
    case catch (seq_trace_SUITE_tracer ! {stop,N,self()}) of
	{'EXIT', _} ->
	    {error, not_started};
	_ ->
	    receive
		{tracerlog,Data} ->
		    Data
	    after 1000 ->
		    {error,timeout}
	    end
    end.

start_tracer() ->
    stop_tracer(0),
    Pid = spawn(?MODULE,simple_tracer,[[], 0]),
    register(seq_trace_SUITE_tracer,Pid),
    seq_trace:set_system_tracer(Pid),
    Pid.

set_token_flags([]) ->
    ok;
set_token_flags([no_timestamp|Flags]) ->
    seq_trace:set_token(timestamp, false),
    seq_trace:set_token(monotonic_timestamp, false),
    seq_trace:set_token(strict_monotonic_timestamp, false),
    set_token_flags(Flags);
set_token_flags([Flag|Flags]) ->
    seq_trace:set_token(Flag, true),
    set_token_flags(Flags).

check_ts(no_timestamp, Ts) ->
    try
	no_timestamp = Ts
    catch
	_ : _ ->
	    ct:fail({unexpected_timestamp, Ts})
    end,
    ok;
check_ts(timestamp, Ts) ->
    try
	{Ms,S,Us} = Ts,
	true = is_integer(Ms),
	true = is_integer(S),
	true = is_integer(Us)
    catch
	_ : _ ->
	    ct:fail({unexpected_timestamp, Ts})
    end,
    ok;
check_ts(monotonic_timestamp, Ts) ->
    try
	true = is_integer(Ts)
    catch
	_ : _ ->
	    ct:fail({unexpected_timestamp, Ts})
    end,
    ok;
check_ts(strict_monotonic_timestamp, Ts) ->
    try
	{MT, UMI} = Ts,
	true = is_integer(MT),
	true = is_integer(UMI)
    catch
	_ : _ ->
	    ct:fail({unexpected_timestamp, Ts})
    end,
    ok.

start_node(Name, Param) ->
    test_server:start_node(Name, slave, [{args, Param}]).

stop_node(Node) ->
    test_server:stop_node(Node).

load_tracer(Config) ->
    Path = proplists:get_value(data_dir, Config),
    ok = erl_ddll:load_driver(Path, echo_drv),
    open_port({spawn,echo_drv}, [eof,binary]).

huge_data() -> huge_data(16384).
huge_data(0) -> [];
huge_data(N) when N rem 2 == 0 ->
    P = huge_data(N div 2),
    [P|P];
huge_data(N) ->
    P = huge_data(N div 2),
    [16#1234566,P|P].