aboutsummaryrefslogtreecommitdiffstats
path: root/library/cpp/lwtrace/trace.cpp
blob: 76e64a3025dff9403247ae847bb66379a6f14c86 (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
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
#include "all.h"
#include "kill_action.h"
#include "log_shuttle.h"
#include "preprocessor.h"
#include "sleep_action.h"
#include "stderr_writer.h"
#include "google/protobuf/repeated_field.h"

#include <util/generic/map.h>
#include <util/random/random.h>

#include <functional>

namespace NLWTrace {
#ifndef LWTRACE_DISABLE

// Define static strings for name of each parameter type
#define FOREACH_PARAMTYPE_MACRO(n, t, v)       \
    const char* TParamType<t>::NameString = n; \
    /**/
    FOREACH_PARAMTYPE(FOREACH_PARAMTYPE_MACRO)
    FOR_NIL_PARAMTYPE(FOREACH_PARAMTYPE_MACRO)
#undef FOREACH_PARAMTYPE_MACRO

#endif

    void TProbeRegistry::AddProbesList(TProbe** reg) {
        TGuard<TMutex> g(Mutex);
        if (reg == nullptr) {
            return;
        }
        for (TProbe** i = reg; *i != nullptr; i++) {
            AddProbeNoLock(new TStaticBox(*i));
        }
    }

    void TProbeRegistry::AddProbe(const TBoxPtr& box) {
        TGuard<TMutex> g(Mutex);
        AddProbeNoLock(box);
    }

    void TProbeRegistry::RemoveProbe(TProbe* probe) {
        TGuard<TMutex> g(Mutex);
        RemoveProbeNoLock(probe);
    }

    void TProbeRegistry::AddProbeNoLock(const TBoxPtr& box) {
        TProbe* probe = box->GetProbe();
        if (Probes.contains(probe)) {
            return; // silently skip probe double registration
        }
        TIds::key_type key(probe->Event.GetProvider(), probe->Event.Name);
        Y_ABORT_UNLESS(Ids.count(key) == 0, "duplicate provider:probe pair %s:%s", key.first.data(), key.second.data());
        Probes.emplace(probe, box);
        Ids.insert(key);
    }

    void TProbeRegistry::RemoveProbeNoLock(TProbe* probe) {
        auto iter = Probes.find(probe);
        if (iter != Probes.end()) {
            TIds::key_type key(probe->Event.GetProvider(), probe->Event.Name);
            Ids.erase(key);
            Probes.erase(iter);
        } else {
            // silently skip probe double unregistration
        }
    }

    TAtomic* GetVariablePtr(TSession::TTraceVariables& traceVariables, const TString& name) {
        TSession::TTraceVariables::iterator it = traceVariables.find(name);
        if (it == traceVariables.end()) {
            TAtomicBase zero = 0;
            traceVariables[name] = zero;
            return &traceVariables[name];
        }
        return &((*it).second);
    }

    typedef enum {
        OT_LITERAL = 0,
        OT_PARAMETER = 1,
        OT_VARIABLE = 2
    } EOperandType;

    template <class T, EOperandType>
    class TOperand;

    template <class T>
    class TOperand<T, OT_LITERAL> {
    private:
        T ImmediateValue;

    public:
        TOperand(TSession::TTraceVariables&, const TString&, const TString& value, size_t) {
            ImmediateValue = TParamConv<T>::FromString(value);
        }
        const T& Get(const TParams&) {
            return ImmediateValue;
        }
    };

    template <class T>
    class TOperand<T, OT_PARAMETER> {
    private:
        size_t Idx;

    public:
        TOperand(TSession::TTraceVariables&, const TString&, const TString&, size_t idx) {
            Idx = idx;
        }

        const T& Get(const TParams& params) {
            return params.Param[Idx].template Get<T>();
        }
    };

    template <class T>
    class TOperand<T, OT_VARIABLE> {
    private:
        TAtomic* Variable;

    public:
        TOperand(TSession::TTraceVariables& traceVariables, const TString& name, const TString&, size_t) {
            Variable = GetVariablePtr(traceVariables, name);
        }

        const T Get(const TParams&) {
            return (T)AtomicGet(*Variable);
        }

        void Set(const T& value) {
            AtomicSet(*Variable, value);
        }

        void Inc() {
            AtomicIncrement(*Variable);
        }

        void Dec() {
            AtomicDecrement(*Variable);
        }

        void Add(const TAtomicBase value) {
            AtomicAdd(*Variable, value);
        }

        void Sub(const TAtomicBase value) {
            AtomicSub(*Variable, value);
        }
    };

    template <>
    class TOperand<TCheck, OT_VARIABLE> {
    private:
        TAtomic* Variable;

    public:
        TOperand(TSession::TTraceVariables& traceVariables, const TString& name, const TString&, size_t) {
            Variable = GetVariablePtr(traceVariables, name);
        }

        const TCheck Get(const TParams&) {
            return TCheck(AtomicGet(*Variable));
        }

        void Set(const TCheck& value) {
            AtomicSet(*Variable, value.Value);
        }

        void Add(const TCheck& value) {
            AtomicAdd(*Variable, value.Value);
        }

        void Sub(const TCheck value) {
            AtomicSub(*Variable, value.Value);
        }

        void Inc() {
            AtomicIncrement(*Variable);
        }

        void Dec() {
            AtomicDecrement(*Variable);
        }
    };

    template <>
    class TOperand<TString, OT_VARIABLE> {
    private:
        TString Dummy;

    public:
        TOperand(TSession::TTraceVariables&, const TString&, const TString&, size_t) {
        }

        const TString Get(const TParams&) {
            return Dummy;
        }

        void Set(const TString&) {
        }
    };

    template <>
    class TOperand<TSymbol, OT_VARIABLE> {
    private:
        TSymbol Dummy;

    public:
        TOperand(TSession::TTraceVariables&, const TString&, const TString&, size_t) {
        }

        const TSymbol Get(const TParams&) {
            return Dummy;
        }

        void Set(const TSymbol&) {
        }
    };

    // IOperandGetter: hide concrete EOperandType, to save compilation time
    template <class T>
    struct IOperandGetter {
        virtual const T Get(const TParams& params) = 0;
        virtual ~IOperandGetter() {
        }
    };

    template <class T, EOperandType TParam>
    class TOperandGetter: public IOperandGetter<T> {
    private:
        TOperand<T, TParam> Op;

    public:
        TOperandGetter(const TOperand<T, TParam>& op)
            : Op(op)
        {
        }

        const T Get(const TParams& params) override {
            return Op.Get(params);
        }
    };

    template <class T>
    class TReceiver: public TOperand<T, OT_VARIABLE> {
    public:
        TReceiver(TSession::TTraceVariables& traceVariables, const TString& name)
            : TOperand<T, OT_VARIABLE>(traceVariables, name, nullptr, 0)
        {
        }
    };

    template <class TP, class TPredicate>
    static bool CmpFunc(TP a, TP b) {
        return TPredicate()(a, b);
    }

    template <class TP, class TFunc, EOperandType TLhs, EOperandType TRhs>
    class TOperatorExecutor: public IExecutor {
    private:
        bool InvertCompare;
        TOperand<TP, TLhs> Lhs;
        TOperand<TP, TRhs> Rhs;

        bool DoExecute(TOrbit&, const TParams& params) override {
            return TFunc()(Lhs.Get(params), Rhs.Get(params)) != InvertCompare;
        }

    public:
        TOperatorExecutor(const TOperand<TP, TLhs>& lhs, const TOperand<TP, TRhs>& rhs, bool invertCompare)
            : InvertCompare(invertCompare)
            , Lhs(lhs)
            , Rhs(rhs)
        {
        }
    };

    template <class TR, class TP>
    struct TAddEq {
        void operator()(TR& x, TP y) const {
            x.Add(y);
        }
    };
    template <class TR, class TP>
    struct TSubEq {
        void operator()(TR& x, TP y) const {
            x.Sub(y);
        }
    };
    template <class TR>
    struct TInc {
        void operator()(TR& x) const {
            x.Inc();
        }
    };
    template <class TR>
    struct TDec {
        void operator()(TR& x) const {
            x.Dec();
        }
    };

    template <class TP, class TFunc>
    class TUnaryInplaceStatementExecutor: public IExecutor {
    private:
        TFunc Func;
        TReceiver<TP> Receiver;

        bool DoExecute(TOrbit&, const TParams&) override {
            Func(Receiver);
            return true;
        }

    public:
        TUnaryInplaceStatementExecutor(TReceiver<TP>& receiver)
            : Receiver(receiver)
        {
        }
    };

    template <class TP, class TFunc, EOperandType TParam>
    class TBinaryInplaceStatementExecutor: public IExecutor {
    private:
        TFunc Func;
        TReceiver<TP> Receiver;
        TOperand<TP, TParam> Param;

        bool DoExecute(TOrbit&, const TParams& params) override {
            Func(Receiver, Param.Get(params));
            return true;
        }

    public:
        TBinaryInplaceStatementExecutor(TReceiver<TP>& receiver, const TOperand<TP, TParam>& param)
            : Receiver(receiver)
            , Param(param)
        {
        }
    };

    template <class TP, class TFunc, EOperandType TFirstParam>
    class TBinaryStatementExecutor: public IExecutor {
    private:
        TFunc Func;
        TReceiver<TP> Receiver;
        TOperand<TP, TFirstParam> FirstParam;

        bool DoExecute(TOrbit&, const TParams& params) override {
            Receiver.Set(Func(Receiver.Get(params), FirstParam.Get(params)));
            return true;
        }

    public:
        TBinaryStatementExecutor(TReceiver<TP>& receiver, const TOperand<TP, TFirstParam>& firstParam)
            : Receiver(receiver)
            , FirstParam(firstParam)
        {
        }
    };

    template <class TP, class TFunc>
    class TTernaryStatementExecutor: public IExecutor {
    private:
        TFunc Func;
        TReceiver<TP> Receiver;

        TAutoPtr<IOperandGetter<TP>> FirstParam;
        TAutoPtr<IOperandGetter<TP>> SecondParam;

        bool DoExecute(TOrbit&, const TParams& params) override {
            Receiver.Set(Func(FirstParam->Get(params), SecondParam->Get(params)));
            return true;
        }

    public:
        TTernaryStatementExecutor(const TReceiver<TP>& receiver,
                                  TAutoPtr<IOperandGetter<TP>> firstParam,
                                  TAutoPtr<IOperandGetter<TP>> secondParam)
            : Receiver(receiver)
            , FirstParam(firstParam)
            , SecondParam(secondParam)
        {
        }
    };

    template <class TLog>
    class TLogActionExecutor: public IExecutor {
    private:
        bool LogParams;
        bool LogTimestamp;
        intptr_t* MaxRecords;
        TAtomic Records;
        TProbe* Probe;
        TLog* Log;

        bool DoExecute(TOrbit&, const TParams& params) override {
            if (MaxRecords != nullptr) {
                while (true) {
                    intptr_t a = AtomicGet(Records);
                    if (a >= *MaxRecords) {
                        return true;
                    }
                    if (AtomicCas(&Records, a + 1, a)) {
                        Write(params);
                        return true;
                    }
                }
            } else {
                Write(params);
                return true;
            }
        }

        void Write(const TParams& params) {
            typename TLog::TAccessor la(*Log);
            if (typename TLog::TItem* item = la.Add()) {
                item->Probe = Probe;
                if (LogParams) {
                    if ((item->SavedParamsCount = Probe->Event.Signature.ParamCount) > 0) {
                        Probe->Event.Signature.CloneParams(item->Params, params);
                    }
                } else {
                    item->SavedParamsCount = 0;
                }
                if (LogTimestamp) {
                    item->Timestamp = TInstant::Now();
                }
                item->TimestampCycles = GetCycleCount();
            }
        }

    public:
        TLogActionExecutor(TProbe* probe, const TLogAction& action, TLog* log)
            : LogParams(!action.GetDoNotLogParams())
            , LogTimestamp(action.GetLogTimestamp())
            , MaxRecords(action.GetMaxRecords() ? new intptr_t(action.GetMaxRecords()) : nullptr)
            , Records(0)
            , Probe(probe)
            , Log(log)
        {
        }

        ~TLogActionExecutor() override {
            delete MaxRecords;
        }
    };

    class TSamplingExecutor: public IExecutor {
    private:
        double SampleRate;

    public:
        explicit TSamplingExecutor(double sampleRate)
            : SampleRate(sampleRate)
        {}

        bool DoExecute(TOrbit&, const TParams&) override {
            return RandomNumber<double>() < SampleRate;
        }
    };

    typedef struct {
        EOperandType Type;
        size_t ParamIdx;
    } TArgumentDescription;

    using TArgumentList = TVector<TArgumentDescription>;

    template <class T>
    void ParseArguments(const T& op, const TSignature& signature, const TString& exceptionPrefix, size_t expectedArgumentCount, TArgumentList& arguments) {
        arguments.clear();
        size_t firstParamIdx = size_t(-1);
        for (size_t argumentIdx = 0; argumentIdx < op.ArgumentSize(); ++argumentIdx) {
            const TArgument& arg = op.GetArgument(argumentIdx);
            TArgumentDescription operand;
            operand.ParamIdx = size_t(-1);
            if (arg.GetVariable()) {
                operand.Type = OT_VARIABLE;
            } else if (arg.GetValue()) {
                operand.Type = OT_LITERAL;
            } else if (arg.GetParam()) {
                operand.Type = OT_PARAMETER;
                operand.ParamIdx = signature.FindParamIndex(arg.GetParam());
                if (operand.ParamIdx == size_t(-1)) {
                    ythrow yexception() << exceptionPrefix
                                        << " argument #" << argumentIdx << " param '" << arg.GetParam()
                                        << "' doesn't exist";
                }
                if (firstParamIdx == size_t(-1)) {
                    firstParamIdx = operand.ParamIdx;
                } else {
                    if (strcmp(signature.ParamTypes[firstParamIdx], signature.ParamTypes[operand.ParamIdx]) != 0) {
                        ythrow yexception() << exceptionPrefix
                                            << " param types do not match";
                    }
                }
            } else {
                ythrow yexception() << exceptionPrefix
                                    << " argument #" << argumentIdx
                                    << " is empty";
            }
            arguments.push_back(operand);
        }
        if (arguments.size() != expectedArgumentCount) {
            ythrow yexception() << exceptionPrefix
                                << " incorrect number of arguments (" << arguments.size()
                                << " present, " << expectedArgumentCount << " expected)";
        }
    }

    template <class TArg1, class TArg2>
    struct TTraceSecondArg {
        // implementation of deprecated std::project2nd
        TArg1 operator()(const TArg1&, const TArg2& y) const {
            return y;
        }
    };

    void TSession::InsertExecutor(
        TTraceVariables& traceVariables, size_t bi, const TPredicate* pred,
        const NProtoBuf::RepeatedPtrField<TAction>& actions, TProbe* probe,
        const bool destructiveActionsAllowed,
        const TCustomActionFactory& customActionFactory) {
#ifndef LWTRACE_DISABLE
        THolder<IExecutor> exec;
        IExecutor* last = nullptr;
        TArgumentList arguments;
        if (pred) {
            double sampleRate = pred->GetSampleRate();
            if (sampleRate != 0.0) {
                if (!(0.0 < sampleRate && sampleRate <= 1.0)) {
                    ythrow yexception() << "probe '" << probe->Event.Name << "' block #" << bi + 1 << " sampling operator"
                                        << " invalid sample rate " << sampleRate << ", expected [0;1]";
                }
                exec.Reset(new TSamplingExecutor(sampleRate));
                last = exec.Get();
            }

            for (size_t i = 0; i < pred->OperatorsSize(); i++) {
                const TOperator& op = pred->GetOperators(i);
                TString exceptionPrefix;
                TStringOutput exceptionPrefixOutput(exceptionPrefix);
                exceptionPrefixOutput << "probe '" << probe->Event.Name << "' block #" << bi + 1 << " operator #" << i + 1;
                ParseArguments<TOperator>(op, probe->Event.Signature, exceptionPrefix, 2, arguments);
                THolder<IExecutor> opExec;

                TArgumentDescription arg0 = arguments.at(0);
                TArgumentDescription arg1 = arguments.at(1);

                const char* tName0 = arg0.ParamIdx == size_t(-1) ? nullptr : probe->Event.Signature.ParamTypes[arg0.ParamIdx];
                const char* tName1 = arg1.ParamIdx == size_t(-1) ? nullptr : probe->Event.Signature.ParamTypes[arg1.ParamIdx];

                TString var0 = op.GetArgument(0).GetVariable();
                TString var1 = op.GetArgument(1).GetVariable();

                TString val0 = op.GetArgument(0).GetValue();
                TString val1 = op.GetArgument(1).GetValue();

#define FOREACH_OPERAND_TYPE_RT(n, t, v, fn, lt, rt)                                    \
    if (rt == arg1.Type) {                                                              \
        TOperand<t, rt> rhs(traceVariables, var1, val1, arg1.ParamIdx);                 \
        opExec.Reset(new TOperatorExecutor<t, fn<t>, lt, rt>(lhs, rhs, invertCompare)); \
        break;                                                                          \
    }

#define FOREACH_OPERAND_TYPE_LT(n, t, v, fn, lt)                        \
    if (lt == arg0.Type) {                                              \
        TOperand<t, lt> lhs(traceVariables, var0, val0, arg0.ParamIdx); \
        FOREACH_RIGHT_TYPE(FOREACH_OPERAND_TYPE_RT, n, t, v, fn, lt)    \
    }

#define FOREACH_PARAMTYPE_MACRO(n, t, v, fn)                                                                                  \
    if ((arg0.ParamIdx == size_t(-1) || strcmp(tName0, n) == 0) && (arg1.ParamIdx == size_t(-1) || strcmp(tName1, n) == 0)) { \
        FOREACH_LEFT_TYPE(FOREACH_OPERAND_TYPE_LT, n, t, v, fn);                                                              \
    }

                bool invertCompare = EqualToOneOf(op.GetType(), OT_NE, OT_GE, OT_LE);

                switch (op.GetType()) {
                    case OT_EQ:
                    case OT_NE:
                        FOREACH_PARAMTYPE(FOREACH_PARAMTYPE_MACRO, std::equal_to);
                        break;
                    case OT_LT:
                    case OT_GE:
                        FOREACH_PARAMTYPE(FOREACH_PARAMTYPE_MACRO, std::less);
                        break;
                    case OT_GT:
                    case OT_LE:
                        FOREACH_PARAMTYPE(FOREACH_PARAMTYPE_MACRO, std::greater);
                        break;
                    default:
                        ythrow yexception() << exceptionPrefix
                                            << " has not supported operator type #" << int(op.GetType());
                }

#undef FOREACH_OPERAND_TYPE_RT
#undef FOREACH_OPERAND_TYPE_LT
#undef FOREACH_PARAMTYPE_MACRO

                if (!opExec) {
                    ythrow yexception() << exceptionPrefix
                                        << " has not supported left param #" << arg0.ParamIdx + 1 << " type '"
                                        << (arg0.ParamIdx != size_t(-1) ? probe->Event.Signature.ParamTypes[arg0.ParamIdx] : "?")
                                        << "', or right param #" << arg0.ParamIdx + 1 << " type '"
                                        << (arg1.ParamIdx != size_t(-1) ? probe->Event.Signature.ParamTypes[arg1.ParamIdx] : "?")
                                        << "'";
                }

                if (!exec) {
                    exec.Reset(opExec.Release());
                    last = exec.Get();
                } else {
                    last->SetNext(opExec.Release());
                    last = last->GetNext();
                }
            }
        }

        for (int i = 0; i < actions.size(); ++i) {
            const TAction& action = actions.Get(i);
            THolder<IExecutor> actExec;
            if (action.HasPrintToStderrAction()) {
                actExec.Reset(new TStderrActionExecutor(probe));
            } else if (action.HasLogAction()) {
                if (Query.GetLogDurationUs()) {
                    actExec.Reset(new TLogActionExecutor<TDurationLog>(probe, action.GetLogAction(), &DurationLog));
                } else {
                    actExec.Reset(new TLogActionExecutor<TCyclicLog>(probe, action.GetLogAction(), &CyclicLog));
                }
            } else if (action.HasRunLogShuttleAction()) {
                if (Query.GetLogDurationUs()) {
                    actExec.Reset(new TRunLogShuttleActionExecutor<TDurationDepot>(TraceIdx, action.GetRunLogShuttleAction(), &DurationDepot, &LastTrackId, &LastSpanId));
                } else {
                    actExec.Reset(new TRunLogShuttleActionExecutor<TCyclicDepot>(TraceIdx, action.GetRunLogShuttleAction(), &CyclicDepot, &LastTrackId, &LastSpanId));
                }
            } else if (action.HasEditLogShuttleAction()) {
                if (Query.GetLogDurationUs()) {
                    actExec.Reset(new TEditLogShuttleActionExecutor<TDurationDepot>(TraceIdx, action.GetEditLogShuttleAction()));
                } else {
                    actExec.Reset(new TEditLogShuttleActionExecutor<TCyclicDepot>(TraceIdx, action.GetEditLogShuttleAction()));
                }
            } else if (action.HasDropLogShuttleAction()) {
                if (Query.GetLogDurationUs()) {
                    actExec.Reset(new TDropLogShuttleActionExecutor<TDurationDepot>(TraceIdx, action.GetDropLogShuttleAction()));
                } else {
                    actExec.Reset(new TDropLogShuttleActionExecutor<TCyclicDepot>(TraceIdx, action.GetDropLogShuttleAction()));
                }
            } else if (action.HasCustomAction()) {
                THolder<TCustomActionExecutor> customExec(customActionFactory.Create(probe, action.GetCustomAction(), this));
                if (customExec) {
                    if (!customExec->IsDestructive() || destructiveActionsAllowed) {
                        actExec.Reset(customExec.Release());
                    } else {
                        ythrow yexception() << "probe '" << probe->Event.Name << "block #" << bi + 1 << " action #" << i + 1
                                            << " contains destructive CustomAction, but destructive actions are disabled."
                                            << " Please, consider using --unsafe-lwtrace command line parameter.";
                    }
                } else {
                    ythrow yexception() << "probe '" << probe->Event.Name << "block #" << bi + 1 << " action #" << i + 1
                                        << " contains unregistered CustomAction '" << action.GetCustomAction().GetName() << "'";
                }
            } else if (action.HasKillAction()) {
                if (destructiveActionsAllowed) {
                    actExec.Reset(new NPrivate::TKillActionExecutor(probe));
                } else {
                    ythrow yexception() << "probe '" << probe->Event.Name << "block #" << bi + 1 << " action #" << i + 1
                                        << " contains destructive KillAction, but destructive actions are disabled."
                                        << " Please, consider using --unsafe-lwtrace command line parameter.";
                }
            } else if (action.HasSleepAction()) {
                if (destructiveActionsAllowed) {
                    const TSleepAction& sleepAction = action.GetSleepAction();
                    if (sleepAction.GetNanoSeconds()) {
                        ui64 nanoSeconds = sleepAction.GetNanoSeconds();
                        actExec.Reset(new NPrivate::TSleepActionExecutor(probe, nanoSeconds));
                    } else {
                        ythrow yexception() << "probe '" << probe->Event.Name << "block #" << bi + 1 << " action #" << i + 1
                                            << " SleepAction missing parameter 'NanoSeconds'";
                    }
                } else {
                    ythrow yexception() << "probe '" << probe->Event.Name << "block #" << bi + 1 << " action #" << i + 1
                                        << " contains destructive SleepAction, but destructive actions are disabled."
                                        << " Please, consider using --unsafe-lwtrace command line parameter.";
                }
            } else if (action.HasStatementAction()) {
                const TStatementAction& statement = action.GetStatementAction();
                TString exceptionPrefix;
                TStringOutput exceptionPrefixOutput(exceptionPrefix);
                exceptionPrefixOutput << "probe '" << probe->Event.Name << "' block #" << bi + 1 << " action #" << i + 1;
                size_t expectedArgumentCount = 3;
                if (statement.GetType() == ST_MOV || statement.GetType() == ST_ADD_EQ || statement.GetType() == ST_SUB_EQ) {
                    expectedArgumentCount = 2;
                } else if (statement.GetType() == ST_INC || statement.GetType() == ST_DEC) {
                    expectedArgumentCount = 1;
                }
                ParseArguments<TStatementAction>(statement, probe->Event.Signature, exceptionPrefix, expectedArgumentCount, arguments);

                TArgumentDescription arg0 = (expectedArgumentCount <= 0) ? TArgumentDescription() : arguments.at(0);
                TArgumentDescription arg1 = (expectedArgumentCount <= 1) ? TArgumentDescription() : arguments.at(1);
                TArgumentDescription arg2 = (expectedArgumentCount <= 2) ? TArgumentDescription() : arguments.at(2);

                TString var0 = (expectedArgumentCount <= 0) ? "" : statement.GetArgument(0).GetVariable();
                TString var1 = (expectedArgumentCount <= 1) ? "" : statement.GetArgument(1).GetVariable();
                TString var2 = (expectedArgumentCount <= 2) ? "" : statement.GetArgument(2).GetVariable();

                TString val0 = (expectedArgumentCount <= 0) ? "" : statement.GetArgument(0).GetValue();
                TString val1 = (expectedArgumentCount <= 1) ? "" : statement.GetArgument(1).GetValue();
                TString val2 = (expectedArgumentCount <= 2) ? "" : statement.GetArgument(2).GetValue();

                const char* tName1 = (expectedArgumentCount <= 1 || arg1.ParamIdx == size_t(-1))
                    ? nullptr : probe->Event.Signature.ParamTypes[arg1.ParamIdx];
                const char* tName2 = (expectedArgumentCount <= 2 || arg2.ParamIdx == size_t(-1))
                    ? nullptr : probe->Event.Signature.ParamTypes[arg2.ParamIdx];

                if (arg0.Type == OT_VARIABLE) {
                    switch (statement.GetType()) {
#define PARSE_UNARY_INPLACE_STATEMENT_MACRO(n, t, v, fn)                   \
    {                                                                      \
        typedef TUnaryInplaceStatementExecutor<t, fn<TReceiver<t>>> TExec; \
        TReceiver<t> receiver(traceVariables, var0);                       \
        actExec.Reset(new TExec(receiver));                                \
        break;                                                             \
    }

#define PARSE_BINARY_INPLACE_STATEMENT_MACRO2(n, t, v, fn, ft)                     \
    if (arg1.Type == ft) {                                                         \
        typedef TBinaryInplaceStatementExecutor<t, fn<TReceiver<t>, t>, ft> TExec; \
        TOperand<t, ft> firstParam(traceVariables, var1, val1, arg1.ParamIdx);     \
        actExec.Reset(new TExec(receiver, firstParam));                            \
        break;                                                                     \
    }

#define PARSE_BINARY_INPLACE_STATEMENT_MACRO(n, t, v, fn)                       \
    if (arg1.ParamIdx == size_t(-1) || strcmp(tName1, n) == 0) {                \
        TReceiver<t> receiver(traceVariables, var0);                            \
        FOREACH_RIGHT_TYPE(PARSE_BINARY_INPLACE_STATEMENT_MACRO2, n, t, v, fn); \
    }

#define PARSE_BINARY_STATEMENT_MACRO2(n, t, v, fn, ft)                         \
    if (arg1.Type == ft) {                                                     \
        typedef TBinaryStatementExecutor<t, fn<t, t>, ft> TExec;               \
        TOperand<t, ft> firstParam(traceVariables, var1, val1, arg1.ParamIdx); \
        actExec.Reset(new TExec(receiver, firstParam));                        \
        break;                                                                 \
    }

#define PARSE_BINARY_STATEMENT_MACRO(n, t, v, fn)                       \
    if (arg1.ParamIdx == size_t(-1) || strcmp(tName1, n) == 0) {        \
        TReceiver<t> receiver(traceVariables, var0);                    \
        FOREACH_RIGHT_TYPE(PARSE_BINARY_STATEMENT_MACRO2, n, t, v, fn); \
    }

#define CREATE_OPERAND_GETTER_N(N, type, arg_type)                                                                                       \
    if (arg##N.Type == arg_type) {                                                                                                       \
        operand##N.Reset(new TOperandGetter<type, arg_type>(TOperand<type, arg_type>(traceVariables, var##N, val##N, arg##N.ParamIdx))); \
    }

#define TERNARY_ON_TYPE(n, t, v, fn)                                                                                          \
    if ((arg1.ParamIdx == size_t(-1) || strcmp(tName1, n) == 0) && (arg2.ParamIdx == size_t(-1) || strcmp(tName2, n) == 0)) { \
        TAutoPtr<IOperandGetter<t>> operand1, operand2;                                                                       \
        FOREACH_LEFT_TYPE(CREATE_OPERAND_GETTER_N, 1, t);                                                                     \
        FOREACH_RIGHT_TYPE(CREATE_OPERAND_GETTER_N, 2, t);                                                                    \
        if (operand1 && operand2) {                                                                                           \
            actExec.Reset(new TTernaryStatementExecutor<t, fn<t>>(                                                            \
                TReceiver<t>(traceVariables, var0),                                                                           \
                operand1,                                                                                                     \
                operand2));                                                                                                   \
        }                                                                                                                     \
        break;                                                                                                                \
    }

#define IMPLEMENT_TERNARY_STATEMENT(fn) FOR_MATH_PARAMTYPE(TERNARY_ON_TYPE, fn)

                        case ST_INC:
                            FOR_MATH_PARAMTYPE(PARSE_UNARY_INPLACE_STATEMENT_MACRO, TInc);
                            break;
                        case ST_DEC:
                            FOR_MATH_PARAMTYPE(PARSE_UNARY_INPLACE_STATEMENT_MACRO, TDec);
                            break;
                        case ST_MOV:
                            FOR_MATH_PARAMTYPE(PARSE_BINARY_STATEMENT_MACRO, TTraceSecondArg);
                            break;
                        case ST_ADD_EQ:
                            FOR_MATH_PARAMTYPE(PARSE_BINARY_INPLACE_STATEMENT_MACRO, TAddEq);
                            break;
                        case ST_SUB_EQ:
                            FOR_MATH_PARAMTYPE(PARSE_BINARY_INPLACE_STATEMENT_MACRO, TSubEq);
                            break;
                        case ST_ADD:
                            IMPLEMENT_TERNARY_STATEMENT(std::plus)
                            break;
                        case ST_SUB:
                            IMPLEMENT_TERNARY_STATEMENT(std::minus)
                            break;
                        case ST_MUL:
                            IMPLEMENT_TERNARY_STATEMENT(std::multiplies)
                            break;
                        case ST_DIV:
                            IMPLEMENT_TERNARY_STATEMENT(std::divides)
                            break;
                        case ST_MOD:
                            IMPLEMENT_TERNARY_STATEMENT(std::modulus)
                            break;
                        default:
                            ythrow yexception() << "block #" << bi + 1 << " action #" << i + 1
                                                << " has not supported statement type #" << int(statement.GetType());
                    }
                }
                if (!actExec) {
                    ythrow yexception() << "block #" << bi + 1 << " action #" << i + 1
                                        << " can't create action";
                }
#undef CREATE_OPERAND_GETTER_N
#undef TERNARY_ON_TYPE
#undef IMPLEMENT_TERNARY_STATEMENT
#undef PARSE_TERNARY_STATEMENT_MACRO
#undef PARSE_BINARY_STATEMENT_MACRO
#undef PARSE_BINARY_INPLACE_STATEMENT_MACRO
#undef PARSE_UNARY_INPLACE_STATEMENT_MACRO
            } else {
                ythrow yexception() << "block #" << bi + 1 << " action #" << i + 1
                                    << " has not supported action '" << action.ShortDebugString() << "'";
            }
            if (!exec) {
                exec.Reset(actExec.Release());
                last = exec.Get();
            } else {
                last->SetNext(actExec.Release());
                last = last->GetNext();
            }
        }

        if (!probe->Attach(exec.Get())) {
            ythrow yexception() << "block #" << bi + 1
                                << " cannot be attached to probe '" << probe->Event.Name << "': no free slots";
        }
        Probes.push_back(std::make_pair(probe, exec.Release()));
#else
        Y_UNUSED(bi);
        Y_UNUSED(pred);
        Y_UNUSED(actions);
        Y_UNUSED(probe);
        Y_UNUSED(destructiveActionsAllowed);
        Y_UNUSED(traceVariables);
        Y_UNUSED(customActionFactory);
#endif
    }

    TSession::TSession(ui64 traceIdx,
                   TProbeRegistry& registry,
                   const TQuery& query,
                   const bool destructiveActionsAllowed,
                   const TCustomActionFactory& customActionFactory)
        : StartTime(TInstant::Now())
        , TraceIdx(traceIdx)
        , Registry(registry)
        , StoreDuration(TDuration::MicroSeconds(query.GetLogDurationUs() * 11 / 10)) // +10% to try avoid truncation while reading multiple threads/traces
        , ReadDuration(TDuration::MicroSeconds(query.GetLogDurationUs()))
        , CyclicLog(query.GetPerThreadLogSize() ? query.GetPerThreadLogSize() : 1000)
        , DurationLog(StoreDuration)
        , CyclicDepot(query.GetPerThreadLogSize() ? query.GetPerThreadLogSize() : 1000)
        , DurationDepot(StoreDuration)
        , LastTrackId(0)
        , LastSpanId(0)
        , Attached(true)
        , Query(query)
    {
        try {
            for (size_t bi = 0; bi < query.BlocksSize(); bi++) {
                const TBlock& block = query.GetBlocks(bi);
                if (!block.HasProbeDesc()) {
                    ythrow yexception() << "block #" << bi + 1 << " has no probe description";
                }
                const TProbeDesc& pdesc = block.GetProbeDesc();
                const TPredicate* pred = block.HasPredicate() ? &block.GetPredicate() : nullptr;
                if (block.ActionSize() < 1) {
                    ythrow yexception() << "block #" << bi + 1 << " has no action";
                }
                const NProtoBuf::RepeatedPtrField<TAction>& actions = block.action();
                if (pdesc.GetName() && pdesc.GetProvider()) {
                    TProbeRegistry::TProbesAccessor probes(Registry);
                    bool found = false;
                    for (auto& kv : probes) {
                        TProbe* probe = kv.first;
                        if (probe->Event.Name == pdesc.GetName() && probe->Event.GetProvider() == pdesc.GetProvider()) {
                            InsertExecutor(TraceVariables, bi, pred, actions, probe, destructiveActionsAllowed, customActionFactory);
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        ythrow yexception() << "block #" << bi + 1 << " has no matching probe with name '"
                                            << pdesc.GetName() << "' provider '" << pdesc.GetProvider() << "'";
                    }
                } else if (pdesc.GetGroup()) {
                    bool found = false;
                    TProbeRegistry::TProbesAccessor probes(Registry);
                    for (auto& kv : probes) {
                        TProbe* probe = kv.first;
                        for (const char* const* gi = probe->Event.Groups; *gi != nullptr; gi++) {
                            if (*gi == pdesc.GetGroup()) {
                                InsertExecutor(TraceVariables, bi, pred, actions, probe, destructiveActionsAllowed, customActionFactory);
                                found = true;
                                break;
                            }
                        }
                    }
                    if (!found) {
                        ythrow yexception() << "block #" << bi + 1
                                            << " has no matching probes for group '" << pdesc.GetGroup() << "'";
                    }
                } else {
                    ythrow yexception() << "block #" << bi + 1 << " has bad probe description: name '" << pdesc.GetName()
                                        << "' provider '" << pdesc.GetProvider()
                                        << "' group '" << pdesc.GetGroup() << "'";
                }
            }
        } catch (...) {
            Destroy();
            throw;
        }
    }

    void TSession::Destroy() {
        Detach();
        for (auto& probe : Probes) {
            delete probe.second;
        }
    }

    TSession::~TSession() {
        Destroy();
    }

    void TSession::Detach() {
        if (Attached) {
            for (auto& p : Probes) {
                TProbe* probe = p.first;
                IExecutor* exec = p.second;
                probe->Detach(exec);
            }
            Attached = false;
        }
    }

    size_t TSession::GetEventsCount() const {
        return CyclicLog.GetEventsCount() + DurationLog.GetEventsCount() + CyclicDepot.GetEventsCount() + DurationDepot.GetEventsCount();
    }

    size_t TSession::GetThreadsCount() const {
        return CyclicLog.GetThreadsCount() + DurationLog.GetThreadsCount() + CyclicDepot.GetThreadsCount() + DurationDepot.GetThreadsCount();
    }

    class TReadToProtobuf {
    private:
        TMap<TThread::TId, TVector<TLogItem>> Items;

    public:
        void ToProtobuf(TLogPb& pb) const {
            TSet<TProbe*> probes;
            ui64 eventsCount = 0;
            for (auto kv : Items) {
                TThreadLogPb* tpb = pb.AddThreadLogs();
                tpb->SetThreadId(kv.first);
                for (TLogItem& item : kv.second) {
                    item.ToProtobuf(*tpb->AddLogItems());
                    probes.insert(item.Probe);
                    eventsCount++;
                }
            }
            pb.SetEventsCount(eventsCount);
            for (TProbe* probe : probes) {
                probe->Event.ToProtobuf(*pb.AddEvents());
            }
        }

        void Push(TThread::TId tid, const TLogItem& item) {
            // Avoid any expansive operations in Push(), because it executes under lock and blocks program being traced
            Items[tid].push_back(item);
        }
    };

    void TSession::ToProtobuf(TLogPb& pb) const {
        TReadToProtobuf reader;
        ReadItems(reader);
        reader.ToProtobuf(pb);
        pb.MutableQuery()->CopyFrom(Query);
        pb.SetCrtTime(TInstant::Now().GetValue());
    }

    TManager::TManager(TProbeRegistry& registry, bool allowDestructiveActions)
        : Registry(registry)
        , DestructiveActionsAllowed(allowDestructiveActions)
        , SerializingExecutor(new TRunLogShuttleActionExecutor<TCyclicDepot>(0, {}, nullptr, nullptr, nullptr))
    {
    }

    TManager::~TManager() {
        for (auto& trace : Traces) {
            delete trace.second;
        }
    }

    bool TManager::HasTrace(const TString& id) const {
        TGuard<TMutex> g(Mtx);
        return Traces.contains(id);
    }

    const TSession* TManager::GetTrace(const TString& id) const {
        TGuard<TMutex> g(Mtx);
        TTraces::const_iterator it = Traces.find(id);
        if (it == Traces.end()) {
            ythrow yexception() << "trace id '" << id << "' is not used";
        } else {
            return it->second;
        }
    }

    void TManager::New(const TString& id, const TQuery& query) {
        TGuard<TMutex> g(Mtx);
        if (Traces.find(id) == Traces.end()) {
            TSession* trace = new TSession(++LastTraceIdx, Registry, query, GetDestructiveActionsAllowed(), CustomActionFactory);
            Traces[id] = trace;
        } else {
            ythrow yexception() << "trace id '" << id << "' is already used";
        }
    }

    void TManager::Delete(const TString& id) {
        TGuard<TMutex> g(Mtx);
        TTraces::iterator it = Traces.find(id);
        if (it == Traces.end()) {
            ythrow yexception() << "trace id '" << id << "' is not used";
        } else {
            delete it->second;
            Traces.erase(it);
        }
    }

    void TManager::Stop(const TString& id) {
        TGuard<TMutex> g(Mtx);
        TTraces::iterator it = Traces.find(id);
        if (it == Traces.end()) {
            ythrow yexception() << "trace id '" << id << "' is not used";
        } else {
            it->second->Detach();
        }
    }
}