summaryrefslogtreecommitdiff
path: root/deps/v8/src/flag-definitions.h
blob: 779a58949e4cf5a981f331f9b69db39ead7f9227 (plain)
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
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This file defines all of the flags.  It is separated into different section,
// for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
// correct section, and use one of the DEFINE_ macros, without a trailing ';'.
//
// This include does not have a guard, because it is a template-style include,
// which can be included multiple times in different modes.  It expects to have
// a mode defined before it's included.  The modes are FLAG_MODE_... below:

#define DEFINE_IMPLICATION(whenflag, thenflag)              \
  DEFINE_VALUE_IMPLICATION(whenflag, thenflag, true)

#define DEFINE_NEG_IMPLICATION(whenflag, thenflag)          \
  DEFINE_VALUE_IMPLICATION(whenflag, thenflag, false)

#define DEFINE_NEG_NEG_IMPLICATION(whenflag, thenflag) \
  DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, false)

// We want to declare the names of the variables for the header file.  Normally
// this will just be an extern declaration, but for a readonly flag we let the
// compiler make better optimizations by giving it the value.
#if defined(FLAG_MODE_DECLARE)
#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
  V8_EXPORT_PRIVATE extern ctype FLAG_##nam;
#define FLAG_READONLY(ftype, ctype, nam, def, cmt) \
  static ctype const FLAG_##nam = def;

// We want to supply the actual storage and value for the flag variable in the
// .cc file.  We only do this for writable flags.
#elif defined(FLAG_MODE_DEFINE)
#ifdef USING_V8_SHARED
#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
  V8_EXPORT_PRIVATE extern ctype FLAG_##nam;
#else
#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
  V8_EXPORT_PRIVATE ctype FLAG_##nam = def;
#endif

// We need to define all of our default values so that the Flag structure can
// access them by pointer.  These are just used internally inside of one .cc,
// for MODE_META, so there is no impact on the flags interface.
#elif defined(FLAG_MODE_DEFINE_DEFAULTS)
#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
  static ctype const FLAGDEFAULT_##nam = def;

// We want to write entries into our meta data table, for internal parsing and
// printing / etc in the flag parser code.  We only do this for writable flags.
#elif defined(FLAG_MODE_META)
#define FLAG_FULL(ftype, ctype, nam, def, cmt)                              \
  { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false } \
  ,
#define FLAG_ALIAS(ftype, ctype, alias, nam)                     \
  {                                                              \
    Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \
        "alias for --" #nam, false                               \
  }                                                              \
  ,

// We produce the code to set flags when it is implied by another flag.
#elif defined(FLAG_MODE_DEFINE_IMPLICATIONS)
#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) \
  if (FLAG_##whenflag) FLAG_##thenflag = value;

#define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) \
  if (!FLAG_##whenflag) FLAG_##thenflag = value;

#else
#error No mode supplied when including flags.defs
#endif

// Dummy defines for modes where it is not relevant.
#ifndef FLAG_FULL
#define FLAG_FULL(ftype, ctype, nam, def, cmt)
#endif

#ifndef FLAG_READONLY
#define FLAG_READONLY(ftype, ctype, nam, def, cmt)
#endif

#ifndef FLAG_ALIAS
#define FLAG_ALIAS(ftype, ctype, alias, nam)
#endif

#ifndef DEFINE_VALUE_IMPLICATION
#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value)
#endif

#ifndef DEFINE_NEG_VALUE_IMPLICATION
#define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value)
#endif

#define COMMA ,

#ifdef FLAG_MODE_DECLARE
// Structure used to hold a collection of arguments to the JavaScript code.
struct JSArguments {
 public:
  inline const char*& operator[](int idx) const { return argv[idx]; }
  static JSArguments Create(int argc, const char** argv) {
    JSArguments args;
    args.argc = argc;
    args.argv = argv;
    return args;
  }
  int argc;
  const char** argv;
};

struct MaybeBoolFlag {
  static MaybeBoolFlag Create(bool has_value, bool value) {
    MaybeBoolFlag flag;
    flag.has_value = has_value;
    flag.value = value;
    return flag;
  }
  bool has_value;
  bool value;
};
#endif

#ifdef DEBUG
#define DEBUG_BOOL true
#else
#define DEBUG_BOOL false
#endif

// Supported ARM configurations are:
//  "armv6":       ARMv6 + VFPv2
//  "armv7":       ARMv7 + VFPv3-D32 + NEON
//  "armv7+sudiv": ARMv7 + VFPv4-D32 + NEON + SUDIV
//  "armv8":       ARMv8 (including all of the above)
#if !defined(ARM_TEST_NO_FEATURE_PROBE) ||                            \
    (defined(CAN_USE_ARMV8_INSTRUCTIONS) &&                           \
     defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \
     defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS))
#define ARM_ARCH_DEFAULT "armv8"
#elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \
    defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS)
#define ARM_ARCH_DEFAULT "armv7+sudiv"
#elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_NEON) && \
    defined(CAN_USE_VFP3_INSTRUCTIONS)
#define ARM_ARCH_DEFAULT "armv7"
#else
#define ARM_ARCH_DEFAULT "armv6"
#endif

#ifdef V8_OS_WIN
# define ENABLE_LOG_COLOUR false
#else
# define ENABLE_LOG_COLOUR true
#endif

#define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt)
#define DEFINE_BOOL_READONLY(nam, def, cmt) \
  FLAG_READONLY(BOOL, bool, nam, def, cmt)
#define DEFINE_MAYBE_BOOL(nam, cmt) \
  FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, {false COMMA false}, cmt)
#define DEFINE_INT(nam, def, cmt) FLAG(INT, int, nam, def, cmt)
#define DEFINE_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt)
#define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt)
#define DEFINE_ARGS(nam, cmt) FLAG(ARGS, JSArguments, nam, {0 COMMA NULL}, cmt)

#define DEFINE_ALIAS_BOOL(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam)
#define DEFINE_ALIAS_INT(alias, nam) FLAG_ALIAS(INT, int, alias, nam)
#define DEFINE_ALIAS_FLOAT(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam)
#define DEFINE_ALIAS_STRING(alias, nam) \
  FLAG_ALIAS(STRING, const char*, alias, nam)
#define DEFINE_ALIAS_ARGS(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam)

//
// Flags in all modes.
//
#define FLAG FLAG_FULL

DEFINE_BOOL(experimental_extras, false,
            "enable code compiled in via v8_experimental_extra_library_files")

// Flags for language modes and experimental language features.
DEFINE_BOOL(use_strict, false, "enforce strict mode")

DEFINE_BOOL(es_staging, false,
            "enable test-worthy harmony features (for internal use only)")
DEFINE_BOOL(harmony, false, "enable all completed harmony features")
DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
DEFINE_IMPLICATION(es_staging, harmony)


// Activate on ClusterFuzz.
DEFINE_IMPLICATION(es_staging, harmony_regexp_lookbehind)
DEFINE_IMPLICATION(es_staging, move_object_start)

// Features that are still work in progress (behind individual flags).
#define HARMONY_INPROGRESS(V)                                           \
  V(harmony_array_prototype_values, "harmony Array.prototype.values")   \
  V(harmony_function_sent, "harmony function.sent")                     \
  V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")             \
  V(harmony_simd, "harmony simd")                                       \
  V(harmony_do_expressions, "harmony do-expressions")                   \
  V(harmony_restrictive_generators,                                     \
    "harmony restrictions on generator declarations")                   \
  V(harmony_regexp_named_captures, "harmony regexp named captures")     \
  V(harmony_regexp_property, "harmony unicode regexp property classes") \
  V(harmony_for_in, "harmony for-in syntax")                            \
  V(harmony_trailing_commas,                                            \
    "harmony trailing commas in function parameter lists")              \
  V(harmony_class_fields, "harmony public fields in class literals")

// Features that are complete (but still behind --harmony/es-staging flag).
#define HARMONY_STAGED_BASE(V)                                               \
  V(harmony_regexp_lookbehind, "harmony regexp lookbehind")                  \
  V(harmony_tailcalls, "harmony tail calls")                                 \
  V(harmony_string_padding, "harmony String-padding methods")

#ifdef V8_I18N_SUPPORT
#define HARMONY_STAGED(V)                                          \
  HARMONY_STAGED_BASE(V)                                           \
  V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts") \
  V(icu_case_mapping, "case mapping with ICU rather than Unibrow")
#else
#define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)
#endif

// Features that are shipping (turned on by default, but internal flag remains).
#define HARMONY_SHIPPING(V)                                                  \
  V(harmony_async_await, "harmony async-await")                              \
  V(harmony_restrictive_declarations,                                        \
    "harmony limitations on sloppy mode function declarations")              \
  V(harmony_object_values_entries, "harmony Object.values / Object.entries") \
  V(harmony_object_own_property_descriptors,                                 \
    "harmony Object.getOwnPropertyDescriptors()")

// Once a shipping feature has proved stable in the wild, it will be dropped
// from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,
// and associated tests are moved from the harmony directory to the appropriate
// esN directory.


#define FLAG_INPROGRESS_FEATURES(id, description) \
  DEFINE_BOOL(id, false, "enable " #description " (in progress)")
HARMONY_INPROGRESS(FLAG_INPROGRESS_FEATURES)
#undef FLAG_INPROGRESS_FEATURES

#define FLAG_STAGED_FEATURES(id, description) \
  DEFINE_BOOL(id, false, "enable " #description) \
  DEFINE_IMPLICATION(harmony, id)
HARMONY_STAGED(FLAG_STAGED_FEATURES)
#undef FLAG_STAGED_FEATURES

#define FLAG_SHIPPING_FEATURES(id, description) \
  DEFINE_BOOL(id, true, "enable " #description) \
  DEFINE_NEG_NEG_IMPLICATION(harmony_shipping, id)
HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
#undef FLAG_SHIPPING_FEATURES

// Flags for experimental implementation features.
DEFINE_BOOL(compiled_keyed_generic_loads, false,
            "use optimizing compiler to generate keyed generic load stubs")
DEFINE_BOOL(allocation_site_pretenuring, true,
            "pretenure with allocation sites")
DEFINE_BOOL(page_promotion, true, "promote pages based on utilization")
DEFINE_INT(page_promotion_threshold, 70,
           "min percentage of live bytes on a page to enable fast evacuation")
DEFINE_BOOL(trace_pretenuring, false,
            "trace pretenuring decisions of HAllocate instructions")
DEFINE_BOOL(trace_pretenuring_statistics, false,
            "trace allocation site pretenuring statistics")
DEFINE_BOOL(track_fields, true, "track fields with only smi values")
DEFINE_BOOL(track_double_fields, true, "track fields with double values")
DEFINE_BOOL(track_heap_object_fields, true, "track fields with heap values")
DEFINE_BOOL(track_computed_fields, true, "track computed boilerplate fields")
DEFINE_IMPLICATION(track_double_fields, track_fields)
DEFINE_IMPLICATION(track_heap_object_fields, track_fields)
DEFINE_IMPLICATION(track_computed_fields, track_fields)
DEFINE_BOOL(track_field_types, true, "track field types")
DEFINE_IMPLICATION(track_field_types, track_fields)
DEFINE_IMPLICATION(track_field_types, track_heap_object_fields)
DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations")

// Flags for optimization types.
DEFINE_BOOL(optimize_for_size, false,
            "Enables optimizations which favor memory size over execution "
            "speed")

DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1)

// Flags for data representation optimizations
DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles")
DEFINE_BOOL(string_slices, true, "use string slices")

// Flags for Ignition.
DEFINE_BOOL(ignition, false, "use ignition interpreter")
DEFINE_BOOL(ignition_staging, false, "use ignition with all staged features")
DEFINE_IMPLICATION(ignition_staging, ignition)
DEFINE_IMPLICATION(ignition_staging, ignition_osr)
DEFINE_IMPLICATION(ignition_staging, turbo_from_bytecode)
DEFINE_IMPLICATION(ignition_staging, ignition_preserve_bytecode)
DEFINE_BOOL(ignition_eager, false, "eagerly compile and parse with ignition")
DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter")
DEFINE_BOOL(ignition_deadcode, true,
            "use ignition dead code elimination optimizer")
DEFINE_BOOL(ignition_osr, false, "enable support for OSR from ignition code")
DEFINE_BOOL(ignition_peephole, true, "use ignition peephole optimizer")
DEFINE_BOOL(ignition_reo, true, "use ignition register equivalence optimizer")
DEFINE_BOOL(ignition_filter_expression_positions, true,
            "filter expression positions before the bytecode pipeline")
DEFINE_BOOL(ignition_preserve_bytecode, false,
            "preserve generated bytecode even when switching tiers")
DEFINE_BOOL(print_bytecode, false,
            "print bytecode generated by ignition interpreter")
DEFINE_BOOL(trace_ignition, false,
            "trace the bytecodes executed by the ignition interpreter")
DEFINE_BOOL(trace_ignition_codegen, false,
            "trace the codegen of ignition interpreter bytecode handlers")
DEFINE_BOOL(trace_ignition_dispatches, false,
            "traces the dispatches to bytecode handlers by the ignition "
            "interpreter")
DEFINE_STRING(trace_ignition_dispatches_output_file, nullptr,
              "the file to which the bytecode handler dispatch table is "
              "written (by default, the table is not written to a file)")

// Flags for Crankshaft.
DEFINE_BOOL(crankshaft, true, "use crankshaft")
DEFINE_STRING(hydrogen_filter, "*", "optimization filter")
DEFINE_BOOL(use_gvn, true, "use hydrogen global value numbering")
DEFINE_INT(gvn_iterations, 3, "maximum number of GVN fix-point iterations")
DEFINE_BOOL(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
DEFINE_BOOL(use_inlining, true, "use function inlining")
DEFINE_BOOL(use_escape_analysis, true, "use hydrogen escape analysis")
DEFINE_BOOL(use_allocation_folding, true, "use allocation folding")
DEFINE_BOOL(use_local_allocation_folding, false, "only fold in basic blocks")
DEFINE_BOOL(use_write_barrier_elimination, true,
            "eliminate write barriers targeting allocations in optimized code")
DEFINE_INT(max_inlining_levels, 5, "maximum number of inlining levels")
DEFINE_INT(max_inlined_source_size, 600,
           "maximum source size in bytes considered for a single inlining")
DEFINE_INT(max_inlined_nodes, 200,
           "maximum number of AST nodes considered for a single inlining")
DEFINE_INT(max_inlined_nodes_cumulative, 400,
           "maximum cumulative number of AST nodes considered for inlining")
DEFINE_BOOL(loop_invariant_code_motion, true, "loop invariant code motion")
DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions")
DEFINE_BOOL(collect_megamorphic_maps_from_stub_cache, false,
            "crankshaft harvests type feedback from stub cache")
DEFINE_BOOL(hydrogen_stats, false, "print statistics for hydrogen")
DEFINE_BOOL(trace_check_elimination, false, "trace check elimination phase")
DEFINE_BOOL(trace_environment_liveness, false,
            "trace liveness of local variable slots")
DEFINE_BOOL(trace_hydrogen, false, "trace generated hydrogen to file")
DEFINE_STRING(trace_hydrogen_filter, "*", "hydrogen tracing filter")
DEFINE_BOOL(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs")
DEFINE_STRING(trace_hydrogen_file, NULL, "trace hydrogen to given file name")
DEFINE_STRING(trace_phase, "HLZ", "trace generated IR for specified phases")
DEFINE_BOOL(trace_inlining, false, "trace inlining decisions")
DEFINE_BOOL(trace_load_elimination, false, "trace load elimination")
DEFINE_BOOL(trace_store_elimination, false, "trace store elimination")
DEFINE_BOOL(turbo_verify_store_elimination, false,
            "verify store elimination more rigorously")
DEFINE_BOOL(trace_alloc, false, "trace register allocator")
DEFINE_BOOL(trace_all_uses, false, "trace all use positions")
DEFINE_BOOL(trace_range, false, "trace range analysis")
DEFINE_BOOL(trace_gvn, false, "trace global value numbering")
DEFINE_BOOL(trace_representation, false, "trace representation types")
DEFINE_BOOL(trace_removable_simulates, false, "trace removable simulates")
DEFINE_BOOL(trace_escape_analysis, false, "trace hydrogen escape analysis")
DEFINE_BOOL(trace_allocation_folding, false, "trace allocation folding")
DEFINE_BOOL(trace_track_allocation_sites, false,
            "trace the tracking of allocation sites")
DEFINE_BOOL(trace_migration, false, "trace object migration")
DEFINE_BOOL(trace_generalization, false, "trace map generalization")
DEFINE_BOOL(stress_pointer_maps, false, "pointer map for every instruction")
DEFINE_BOOL(stress_environments, false, "environment for every instruction")
DEFINE_INT(deopt_every_n_times, 0,
           "deoptimize every n times a deopt point is passed")
DEFINE_INT(deopt_every_n_garbage_collections, 0,
           "deoptimize every n garbage collections")
DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points")
DEFINE_BOOL(trap_on_deopt, false, "put a break point before deoptimizing")
DEFINE_BOOL(trap_on_stub_deopt, false,
            "put a break point before deoptimizing a stub")
DEFINE_BOOL(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining")
DEFINE_BOOL(use_osr, true, "use on-stack replacement")
DEFINE_BOOL(array_bounds_checks_elimination, true,
            "perform array bounds checks elimination")
DEFINE_BOOL(trace_bce, false, "trace array bounds check elimination")
DEFINE_BOOL(array_index_dehoisting, true, "perform array index dehoisting")
DEFINE_BOOL(analyze_environment_liveness, true,
            "analyze liveness of environment slots and zap dead values")
DEFINE_BOOL(load_elimination, true, "use load elimination")
DEFINE_BOOL(check_elimination, true, "use check elimination")
DEFINE_BOOL(store_elimination, false, "use store elimination")
DEFINE_BOOL(dead_code_elimination, true, "use dead code elimination")
DEFINE_BOOL(fold_constants, true, "use constant folding")
DEFINE_BOOL(trace_dead_code_elimination, false, "trace dead code elimination")
DEFINE_BOOL(unreachable_code_elimination, true, "eliminate unreachable code")
DEFINE_BOOL(trace_osr, false, "trace on-stack replacement")
DEFINE_INT(stress_runs, 0, "number of stress runs")
DEFINE_BOOL(lookup_sample_by_shared, true,
            "when picking a function to optimize, watch for shared function "
            "info, not JSFunction itself")
DEFINE_BOOL(flush_optimized_code_cache, false,
            "flushes the cache of optimized code for closures on every GC")
DEFINE_BOOL(inline_construct, true, "inline constructor calls")
DEFINE_BOOL(inline_arguments, true, "inline functions with arguments object")
DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors")
DEFINE_BOOL(inline_into_try, false, "inline into try blocks")
DEFINE_IMPLICATION(turbo, inline_into_try)
DEFINE_INT(escape_analysis_iterations, 2,
           "maximum number of escape analysis fix-point iterations")

DEFINE_BOOL(concurrent_recompilation, true,
            "optimizing hot functions asynchronously on a separate thread")
DEFINE_BOOL(trace_concurrent_recompilation, false,
            "track concurrent recompilation")
DEFINE_INT(concurrent_recompilation_queue_length, 8,
           "the length of the concurrent compilation queue")
DEFINE_INT(concurrent_recompilation_delay, 0,
           "artificial compilation delay in ms")
DEFINE_BOOL(block_concurrent_recompilation, false,
            "block queued jobs until released")

DEFINE_BOOL(omit_map_checks_for_leaf_maps, true,
            "do not emit check maps for constant values that have a leaf map, "
            "deoptimize the optimized code if the layout of the maps changes.")

// Flags for TurboFan.
DEFINE_BOOL(turbo, false, "enable TurboFan compiler")
DEFINE_IMPLICATION(turbo, turbo_asm_deoptimization)
DEFINE_IMPLICATION(turbo, turbo_loop_peeling)
DEFINE_BOOL(turbo_from_bytecode, false, "enable building graphs from bytecode")
DEFINE_BOOL(turbo_sp_frame_access, false,
            "use stack pointer-relative access to frame wherever possible")
DEFINE_BOOL(turbo_preprocess_ranges, true,
            "run pre-register allocation heuristics")
DEFINE_BOOL(turbo_loop_stackcheck, true, "enable stack checks in loops")
DEFINE_STRING(turbo_filter, "~~", "optimization filter for TurboFan compiler")
DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR")
DEFINE_BOOL(trace_turbo_graph, false, "trace generated TurboFan graphs")
DEFINE_IMPLICATION(trace_turbo_graph, trace_turbo)
DEFINE_STRING(trace_turbo_cfg_file, NULL,
              "trace turbo cfg graph (for C1 visualizer) to a given file name")
DEFINE_BOOL(trace_turbo_types, true, "trace TurboFan's types")
DEFINE_BOOL(trace_turbo_scheduler, false, "trace TurboFan's scheduler")
DEFINE_BOOL(trace_turbo_reduction, false, "trace TurboFan's various reducers")
DEFINE_BOOL(trace_turbo_trimming, false, "trace TurboFan's graph trimmer")
DEFINE_BOOL(trace_turbo_jt, false, "trace TurboFan's jump threading")
DEFINE_BOOL(trace_turbo_ceq, false, "trace TurboFan's control equivalence")
DEFINE_BOOL(trace_turbo_loop, false, "trace TurboFan's loop optimizations")
DEFINE_BOOL(turbo_asm, true, "enable TurboFan for asm.js code")
DEFINE_BOOL(turbo_asm_deoptimization, false,
            "enable deoptimization in TurboFan for asm.js code")
DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase")
DEFINE_BOOL(turbo_verify_machine_graph, false,
            "verify TurboFan machine graph before instruction selection")
DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics")
DEFINE_BOOL(turbo_stats_nvp, false,
            "print TurboFan statistics in machine-readable format")
DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan")
DEFINE_BOOL(turbo_type_feedback, true,
            "use typed feedback for representation inference in Turbofan")
DEFINE_BOOL(turbo_source_positions, false,
            "track source code positions when building TurboFan IR")
DEFINE_IMPLICATION(trace_turbo, turbo_source_positions)
DEFINE_BOOL(function_context_specialization, false,
            "enable function context specialization in TurboFan")
DEFINE_BOOL(native_context_specialization, true,
            "enable native context specialization in TurboFan")
DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan")
DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining")
DEFINE_BOOL(turbo_load_elimination, true, "enable load elimination in TurboFan")
DEFINE_BOOL(trace_turbo_load_elimination, false,
            "trace TurboFan load elimination")
DEFINE_BOOL(loop_assignment_analysis, true, "perform loop assignment analysis")
DEFINE_BOOL(turbo_profiling, false, "enable profiling in TurboFan")
DEFINE_BOOL(turbo_verify_allocation, DEBUG_BOOL,
            "verify register allocation in TurboFan")
DEFINE_BOOL(turbo_move_optimization, true, "optimize gap moves in TurboFan")
DEFINE_BOOL(turbo_jt, true, "enable jump threading in TurboFan")
DEFINE_BOOL(turbo_stress_loop_peeling, false,
            "stress loop peeling optimization")
DEFINE_BOOL(turbo_loop_peeling, false, "Turbofan loop peeling")
DEFINE_BOOL(turbo_loop_variable, true, "Turbofan loop variable optimization")
DEFINE_BOOL(turbo_cf_optimization, true, "optimize control flow in TurboFan")
DEFINE_BOOL(turbo_frame_elision, true, "elide frames in TurboFan")
DEFINE_BOOL(turbo_cache_shared_code, true, "cache context-independent code")
DEFINE_BOOL(turbo_preserve_shared_code, false, "keep context-independent code")
DEFINE_BOOL(turbo_escape, false, "enable escape analysis")
DEFINE_BOOL(turbo_instruction_scheduling, false,
            "enable instruction scheduling in TurboFan")
DEFINE_BOOL(turbo_stress_instruction_scheduling, false,
            "randomly schedule instructions to stress dependency tracking")
DEFINE_BOOL(turbo_store_elimination, true,
            "enable store-store elimination in TurboFan")

// Flags to help platform porters
DEFINE_BOOL(minimal, false,
            "simplifies execution model to make porting "
            "easier (e.g. always use Ignition, never use Crankshaft")
DEFINE_IMPLICATION(minimal, ignition)
DEFINE_NEG_IMPLICATION(minimal, crankshaft)
DEFINE_NEG_IMPLICATION(minimal, use_ic)

// Flags for native WebAssembly.
DEFINE_BOOL(expose_wasm, false, "expose WASM interface to JavaScript")
DEFINE_INT(wasm_num_compilation_tasks, 10,
           "number of parallel compilation tasks for wasm")
DEFINE_BOOL(trace_wasm_encoder, false, "trace encoding of wasm code")
DEFINE_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code")
DEFINE_BOOL(trace_wasm_decode_time, false, "trace decoding time of wasm code")
DEFINE_BOOL(trace_wasm_compiler, false, "trace compiling of wasm code")
DEFINE_BOOL(trace_wasm_interpreter, false, "trace interpretation of wasm code")
DEFINE_INT(trace_wasm_ast_start, 0,
           "start function for WASM AST trace (inclusive)")
DEFINE_INT(trace_wasm_ast_end, 0, "end function for WASM AST trace (exclusive)")
DEFINE_INT(skip_compiling_wasm_funcs, 0, "start compiling at function N")
DEFINE_BOOL(wasm_break_on_decoder_error, false,
            "debug break when wasm decoder encounters an error")
DEFINE_BOOL(wasm_loop_assignment_analysis, true,
            "perform loop assignment analysis for WASM")

DEFINE_BOOL(validate_asm, false, "validate asm.js modules before compiling")

DEFINE_BOOL(dump_wasm_module, false, "dump WASM module bytes")
DEFINE_STRING(dump_wasm_module_path, NULL, "directory to dump wasm modules to")

DEFINE_INT(typed_array_max_size_in_heap, 64,
           "threshold for in-heap typed array")

DEFINE_BOOL(wasm_simd_prototype, false,
            "enable prototype simd opcodes for wasm")
DEFINE_BOOL(wasm_eh_prototype, false,
            "enable prototype exception handling opcodes for wasm")
DEFINE_BOOL(wasm_mv_prototype, false,
            "enable prototype multi-value support for wasm")

DEFINE_BOOL(wasm_trap_handler, false,
            "use signal handlers to catch out of bounds memory access in wasm"
            " (currently Linux x86_64 only)")

// Profiler flags.
DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler")
// 0x1800 fits in the immediate field of an ARM instruction.
DEFINE_INT(interrupt_budget, 0x1800,
           "execution budget before interrupt is triggered")
DEFINE_INT(type_info_threshold, 25,
           "percentage of ICs that must have type info to allow optimization")
DEFINE_INT(generic_ic_threshold, 30,
           "max percentage of megamorphic/generic ICs to allow optimization")
DEFINE_INT(self_opt_count, 130, "call count before self-optimization")

DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing")
DEFINE_IMPLICATION(trace_opt_verbose, trace_opt)

// assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
DEFINE_BOOL(debug_code, false, "generate extra code (assertions) for debugging")
DEFINE_BOOL(code_comments, false, "emit comments in code disassembly")
DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 instructions if available")
DEFINE_BOOL(enable_ssse3, true, "enable use of SSSE3 instructions if available")
DEFINE_BOOL(enable_sse4_1, true,
            "enable use of SSE4.1 instructions if available")
DEFINE_BOOL(enable_sahf, true,
            "enable use of SAHF instruction if available (X64 only)")
DEFINE_BOOL(enable_avx, true, "enable use of AVX instructions if available")
DEFINE_BOOL(enable_fma3, true, "enable use of FMA3 instructions if available")
DEFINE_BOOL(enable_bmi1, true, "enable use of BMI1 instructions if available")
DEFINE_BOOL(enable_bmi2, true, "enable use of BMI2 instructions if available")
DEFINE_BOOL(enable_lzcnt, true, "enable use of LZCNT instruction if available")
DEFINE_BOOL(enable_popcnt, true,
            "enable use of POPCNT instruction if available")
DEFINE_STRING(arm_arch, ARM_ARCH_DEFAULT,
              "generate instructions for the selected ARM architecture if "
              "available: armv6, armv7, armv7+sudiv or armv8")
DEFINE_BOOL(enable_vldr_imm, false,
            "enable use of constant pools for double immediate (ARM only)")
DEFINE_BOOL(force_long_branches, false,
            "force all emitted branches to be in long mode (MIPS/PPC only)")
DEFINE_STRING(mcpu, "auto", "enable optimization for specific cpu")

// Deprecated ARM flags (replaced by arm_arch).
DEFINE_MAYBE_BOOL(enable_armv7, "deprecated (use --arm_arch instead)")
DEFINE_MAYBE_BOOL(enable_vfp3, "deprecated (use --arm_arch instead)")
DEFINE_MAYBE_BOOL(enable_32dregs, "deprecated (use --arm_arch instead)")
DEFINE_MAYBE_BOOL(enable_neon, "deprecated (use --arm_arch instead)")
DEFINE_MAYBE_BOOL(enable_sudiv, "deprecated (use --arm_arch instead)")
DEFINE_MAYBE_BOOL(enable_armv8, "deprecated (use --arm_arch instead)")

// regexp-macro-assembler-*.cc
DEFINE_BOOL(enable_regexp_unaligned_accesses, true,
            "enable unaligned accesses for the regexp engine")

// api.cc
DEFINE_BOOL(script_streaming, true, "enable parsing on background")

// bootstrapper.cc
DEFINE_STRING(expose_natives_as, NULL, "expose natives in global object")
DEFINE_STRING(expose_debug_as, NULL, "expose debug in global object")
DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension")
DEFINE_BOOL(expose_gc, false, "expose gc extension")
DEFINE_STRING(expose_gc_as, NULL,
              "expose gc extension under the specified name")
DEFINE_IMPLICATION(expose_gc_as, expose_gc)
DEFINE_BOOL(expose_externalize_string, false,
            "expose externalize string extension")
DEFINE_BOOL(expose_trigger_failure, false, "expose trigger-failure extension")
DEFINE_INT(stack_trace_limit, 10, "number of stack frames to capture")
DEFINE_BOOL(builtins_in_stack_traces, false,
            "show built-in functions in stack traces")

// builtins.cc
DEFINE_BOOL(allow_unsafe_function_constructor, false,
            "allow invoking the function constructor without security checks")

// builtins-ia32.cc
DEFINE_BOOL(inline_new, true, "use fast inline allocation")

// codegen-ia32.cc / codegen-arm.cc
DEFINE_BOOL(trace_codegen, false,
            "print name of functions for which code is generated")
DEFINE_BOOL(trace, false, "trace function calls")
DEFINE_BOOL(mask_constants_with_cookie, true,
            "use random jit cookie to mask large constants")

// codegen.cc
DEFINE_BOOL(lazy, true, "use lazy compilation")
DEFINE_BOOL(trace_opt, false, "trace lazy optimization")
DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics")
DEFINE_BOOL(trace_file_names, false,
            "include file names in trace-opt/trace-deopt output")
DEFINE_BOOL(opt, true, "use adaptive optimizations")
DEFINE_BOOL(always_opt, false, "always try to optimize functions")
DEFINE_BOOL(always_osr, false, "always try to OSR functions")
DEFINE_BOOL(prepare_always_opt, false, "prepare for turning on always opt")
DEFINE_BOOL(trace_deopt, false, "trace optimize function deoptimization")
DEFINE_BOOL(trace_stub_failures, false,
            "trace deoptimization of generated code stubs")

DEFINE_BOOL(serialize_toplevel, true, "enable caching of toplevel scripts")
DEFINE_BOOL(serialize_eager, false, "compile eagerly when caching scripts")
DEFINE_BOOL(serialize_age_code, false, "pre age code in the code cache")
DEFINE_BOOL(trace_serializer, false, "print code serializer trace")

// compiler.cc
DEFINE_INT(min_preparse_length, 1024,
           "minimum length for automatic enable preparsing")
DEFINE_INT(max_opt_count, 10,
           "maximum number of optimization attempts before giving up.")

// compilation-cache.cc
DEFINE_BOOL(compilation_cache, true, "enable compilation cache")

DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions")

// cpu-profiler.cc
DEFINE_INT(cpu_profiler_sampling_interval, 1000,
           "CPU profiler sampling interval in microseconds")

// Array abuse tracing
DEFINE_BOOL(trace_js_array_abuse, false,
            "trace out-of-bounds accesses to JS arrays")
DEFINE_BOOL(trace_external_array_abuse, false,
            "trace out-of-bounds-accesses to external arrays")
DEFINE_BOOL(trace_array_abuse, false,
            "trace out-of-bounds accesses to all arrays")
DEFINE_IMPLICATION(trace_array_abuse, trace_js_array_abuse)
DEFINE_IMPLICATION(trace_array_abuse, trace_external_array_abuse)

// debugger
DEFINE_BOOL(trace_debug_json, false, "trace debugging JSON request/response")
DEFINE_BOOL(enable_liveedit, true, "enable liveedit experimental feature")
DEFINE_BOOL(hard_abort, true, "abort by crashing")

// execution.cc
DEFINE_INT(stack_size, V8_DEFAULT_STACK_SIZE_KB,
           "default size of stack region v8 is allowed to use (in kBytes)")

// frames.cc
DEFINE_INT(max_stack_trace_source_length, 300,
           "maximum length of function source code printed in a stack trace.")

// full-codegen.cc
DEFINE_BOOL(always_inline_smi_code, false,
            "always inline smi code in non-opt code")
DEFINE_BOOL(verify_operand_stack_depth, false,
            "emit debug code that verifies the static tracking of the operand "
            "stack depth")

// heap.cc
DEFINE_INT(min_semi_space_size, 0,
           "min size of a semi-space (in MBytes), the new space consists of two"
           "semi-spaces")
DEFINE_INT(max_semi_space_size, 0,
           "max size of a semi-space (in MBytes), the new space consists of two"
           "semi-spaces")
DEFINE_INT(semi_space_growth_factor, 2, "factor by which to grow the new space")
DEFINE_BOOL(experimental_new_space_growth_heuristic, false,
            "Grow the new space based on the percentage of survivors instead "
            "of their absolute value.")
DEFINE_INT(max_old_space_size, 0, "max size of the old space (in Mbytes)")
DEFINE_INT(initial_old_space_size, 0, "initial old space size (in Mbytes)")
DEFINE_INT(max_executable_size, 0, "max size of executable memory (in Mbytes)")
DEFINE_BOOL(gc_global, false, "always perform global GCs")
DEFINE_INT(gc_interval, -1, "garbage collect after <n> allocations")
DEFINE_INT(retain_maps_for_n_gc, 2,
           "keeps maps alive for <n> old space garbage collections")
DEFINE_BOOL(trace_gc, false,
            "print one trace line following each garbage collection")
DEFINE_BOOL(trace_gc_nvp, false,
            "print one detailed trace line in name=value format "
            "after each garbage collection")
DEFINE_BOOL(trace_gc_ignore_scavenger, false,
            "do not print trace line after scavenger collection")
DEFINE_BOOL(trace_idle_notification, false,
            "print one trace line following each idle notification")
DEFINE_BOOL(trace_idle_notification_verbose, false,
            "prints the heap state used by the idle notification")
DEFINE_BOOL(print_max_heap_committed, false,
            "print statistics of the maximum memory committed for the heap "
            "in name=value format on exit")
DEFINE_BOOL(trace_gc_verbose, false,
            "print more details following each garbage collection")
DEFINE_INT(trace_allocation_stack_interval, -1,
           "print stack trace after <n> free-list allocations")
DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space")
DEFINE_BOOL(trace_fragmentation_verbose, false,
            "report fragmentation for old space (detailed)")
DEFINE_BOOL(trace_evacuation, false, "report evacuation statistics")
DEFINE_BOOL(trace_mutator_utilization, false,
            "print mutator utilization, allocation speed, gc speed")
DEFINE_BOOL(weak_embedded_maps_in_optimized_code, true,
            "make maps embedded in optimized code weak")
DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true,
            "make objects embedded in optimized code weak")
DEFINE_BOOL(flush_code, true, "flush code that we expect not to use again")
DEFINE_BOOL(trace_code_flushing, false, "trace code flushing progress")
DEFINE_BOOL(age_code, true,
            "track un-executed functions to age code and flush only "
            "old code (required for code flushing)")
DEFINE_BOOL(incremental_marking, true, "use incremental marking")
DEFINE_BOOL(incremental_marking_wrappers, false,
            "use incremental marking for marking wrappers")
DEFINE_INT(min_progress_during_incremental_marking_finalization, 32,
           "keep finalizing incremental marking as long as we discover at "
           "least this many unmarked objects")
DEFINE_INT(max_incremental_marking_finalization_rounds, 3,
           "at most try this many times to finalize incremental marking")
DEFINE_BOOL(black_allocation, false, "use black allocation")
DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping")
DEFINE_BOOL(parallel_compaction, true, "use parallel compaction")
DEFINE_BOOL(parallel_pointer_update, true,
            "use parallel pointer update during compaction")
DEFINE_BOOL(trace_incremental_marking, false,
            "trace progress of the incremental marking")
DEFINE_BOOL(track_gc_object_stats, false,
            "track object counts and memory usage")
DEFINE_BOOL(trace_gc_object_stats, false,
            "trace object counts and memory usage")
DEFINE_IMPLICATION(trace_gc_object_stats, track_gc_object_stats)
DEFINE_NEG_IMPLICATION(trace_gc_object_stats, incremental_marking)
DEFINE_BOOL(track_detached_contexts, true,
            "track native contexts that are expected to be garbage collected")
DEFINE_BOOL(trace_detached_contexts, false,
            "trace native contexts that are expected to be garbage collected")
DEFINE_IMPLICATION(trace_detached_contexts, track_detached_contexts)
#ifdef VERIFY_HEAP
DEFINE_BOOL(verify_heap, false, "verify heap pointers before and after GC")
#endif
DEFINE_BOOL(move_object_start, true, "enable moving of object starts")
DEFINE_BOOL(memory_reducer, true, "use memory reducer")
DEFINE_BOOL(scavenge_reclaim_unmodified_objects, true,
            "remove unmodified and unreferenced objects")
DEFINE_INT(heap_growing_percent, 0,
           "specifies heap growing factor as (1 + heap_growing_percent/100)")

// execution.cc, messages.cc
DEFINE_BOOL(clear_exceptions_on_js_entry, false,
            "clear pending exceptions when entering JavaScript")

// counters.cc
DEFINE_INT(histogram_interval, 600000,
           "time interval in ms for aggregating memory histograms")

// global-handles.cc
DEFINE_BOOL(trace_object_groups, false,
            "print object groups detected during each garbage collection")

// heap-snapshot-generator.cc
DEFINE_BOOL(heap_profiler_trace_objects, false,
            "Dump heap object allocations/movements/size_updates")


// sampling-heap-profiler.cc
DEFINE_BOOL(sampling_heap_profiler_suppress_randomness, false,
            "Use constant sample intervals to eliminate test flakiness")


// v8.cc
DEFINE_BOOL(use_idle_notification, true,
            "Use idle notification to reduce memory footprint.")
// ic.cc
DEFINE_BOOL(use_ic, true, "use inline caching")
DEFINE_BOOL(trace_ic, false, "trace inline cache state transitions")
DEFINE_BOOL(tf_load_ic_stub, true, "use TF LoadIC stub")
DEFINE_BOOL(tf_store_ic_stub, true, "use TF StoreIC stub")

// macro-assembler-ia32.cc
DEFINE_BOOL(native_code_counters, false,
            "generate extra code for manipulating stats counters")

// mark-compact.cc
DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC")
DEFINE_BOOL(never_compact, false,
            "Never perform compaction on full GC - testing only")
DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections")
DEFINE_BOOL(cleanup_code_caches_at_gc, true,
            "Flush inline caches prior to mark compact collection and "
            "flush code caches in maps during mark compact cycle.")
DEFINE_BOOL(use_marking_progress_bar, true,
            "Use a progress bar to scan large objects in increments when "
            "incremental marking is active.")
DEFINE_BOOL(zap_code_space, DEBUG_BOOL,
            "Zap free memory in code space with 0xCC while sweeping.")
DEFINE_INT(random_seed, 0,
           "Default seed for initializing random generator "
           "(0, the default, means to use system random).")

// objects.cc
DEFINE_BOOL(trace_weak_arrays, false, "Trace WeakFixedArray usage")
DEFINE_BOOL(trace_prototype_users, false,
            "Trace updates to prototype user tracking")
DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing")
DEFINE_BOOL(trace_for_in_enumerate, false, "Trace for-in enumerate slow-paths")
#if TRACE_MAPS
DEFINE_BOOL(trace_maps, false, "trace map creation")
#endif

// parser.cc
DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax")
DEFINE_BOOL(trace_parse, false, "trace parsing and preparsing")
DEFINE_BOOL(lazy_inner_functions, false, "enable lazy parsing inner functions")

// simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc
DEFINE_BOOL(trace_sim, false, "Trace simulator execution")
DEFINE_BOOL(debug_sim, false, "Enable debugging the simulator")
DEFINE_BOOL(check_icache, false,
            "Check icache flushes in ARM and MIPS simulator")
DEFINE_INT(stop_sim_at, 0, "Simulator stop after x number of instructions")
#if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) || \
    defined(V8_TARGET_ARCH_PPC64)
DEFINE_INT(sim_stack_alignment, 16,
           "Stack alignment in bytes in simulator. This must be a power of two "
           "and it must be at least 16. 16 is default.")
#else
DEFINE_INT(sim_stack_alignment, 8,
           "Stack alingment in bytes in simulator (4 or 8, 8 is default)")
#endif
DEFINE_INT(sim_stack_size, 2 * MB / KB,
           "Stack size of the ARM64, MIPS64 and PPC64 simulator "
           "in kBytes (default is 2 MB)")
DEFINE_BOOL(log_regs_modified, true,
            "When logging register values, only print modified registers.")
DEFINE_BOOL(log_colour, ENABLE_LOG_COLOUR,
            "When logging, try to use coloured output.")
DEFINE_BOOL(ignore_asm_unimplemented_break, false,
            "Don't break for ASM_UNIMPLEMENTED_BREAK macros.")
DEFINE_BOOL(trace_sim_messages, false,
            "Trace simulator debug messages. Implied by --trace-sim.")

// isolate.cc
DEFINE_BOOL(stack_trace_on_illegal, false,
            "print stack trace when an illegal exception is thrown")
DEFINE_BOOL(abort_on_uncaught_exception, false,
            "abort program (dump core) when an uncaught exception is thrown")
DEFINE_BOOL(abort_on_stack_overflow, false,
            "Abort program when stack overflow (as opposed to throwing "
            "RangeError). This is useful for fuzzing where the spec behaviour "
            "would introduce nondeterminism.")
DEFINE_BOOL(randomize_hashes, true,
            "randomize hashes to avoid predictable hash collisions "
            "(with snapshots this option cannot override the baked-in seed)")
DEFINE_INT(hash_seed, 0,
           "Fixed seed to use to hash property keys (0 means random)"
           "(with snapshots this option cannot override the baked-in seed)")
DEFINE_BOOL(trace_rail, false, "trace RAIL mode")

// runtime.cc
DEFINE_BOOL(runtime_call_stats, false, "report runtime call counts and times")

// snapshot-common.cc
DEFINE_BOOL(profile_deserialization, false,
            "Print the time it takes to deserialize the snapshot.")
DEFINE_BOOL(serialization_statistics, false,
            "Collect statistics on serialized objects.")

// Regexp
DEFINE_BOOL(regexp_optimization, true, "generate optimized regexp code")

// Testing flags test/cctest/test-{flags,api,serialization}.cc
DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag")
DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag")
DEFINE_INT(testing_int_flag, 13, "testing_int_flag")
DEFINE_FLOAT(testing_float_flag, 2.5, "float-flag")
DEFINE_STRING(testing_string_flag, "Hello, world!", "string-flag")
DEFINE_INT(testing_prng_seed, 42, "Seed used for threading test randomness")

// mksnapshot.cc
DEFINE_STRING(startup_src, NULL,
              "Write V8 startup as C++ src. (mksnapshot only)")
DEFINE_STRING(startup_blob, NULL,
              "Write V8 startup blob file. (mksnapshot only)")

// code-stubs-hydrogen.cc
DEFINE_BOOL(profile_hydrogen_code_stub_compilation, false,
            "Print the time it takes to lazily compile hydrogen code stubs.")

DEFINE_BOOL(predictable, false, "enable predictable mode")
DEFINE_NEG_IMPLICATION(predictable, concurrent_recompilation)
DEFINE_NEG_IMPLICATION(predictable, concurrent_sweeping)
DEFINE_NEG_IMPLICATION(predictable, parallel_compaction)
DEFINE_NEG_IMPLICATION(predictable, memory_reducer)

// mark-compact.cc
DEFINE_BOOL(force_marking_deque_overflows, false,
            "force overflows of marking deque by reducing it's size "
            "to 64 words")

DEFINE_BOOL(stress_compaction, false,
            "stress the GC compactor to flush out bugs (implies "
            "--force_marking_deque_overflows)")

DEFINE_BOOL(manual_evacuation_candidates_selection, false,
            "Test mode only flag. It allows an unit test to select evacuation "
            "candidates pages (requires --stress_compaction).")

DEFINE_BOOL(disable_old_api_accessors, false,
            "Disable old-style API accessors whose setters trigger through the "
            "prototype chain")

//
// Dev shell flags
//

DEFINE_BOOL(help, false, "Print usage message, including flags, on console")
DEFINE_BOOL(dump_counters, false, "Dump counters on exit")

DEFINE_STRING(map_counters, "", "Map counters to a file")
DEFINE_ARGS(js_arguments,
            "Pass all remaining arguments to the script. Alias for \"--\".")

//
// GDB JIT integration flags.
//
#undef FLAG
#ifdef ENABLE_GDB_JIT_INTERFACE
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif

DEFINE_BOOL(gdbjit, false, "enable GDBJIT interface")
DEFINE_BOOL(gdbjit_full, false, "enable GDBJIT interface for all code objects")
DEFINE_BOOL(gdbjit_dump, false, "dump elf objects with debug info to disk")
DEFINE_STRING(gdbjit_dump_filter, "",
              "dump only objects containing this substring")

#ifdef ENABLE_GDB_JIT_INTERFACE
DEFINE_IMPLICATION(gdbjit_full, gdbjit)
DEFINE_IMPLICATION(gdbjit_dump, gdbjit)
#endif
DEFINE_NEG_IMPLICATION(gdbjit, compact_code_space)

//
// Debug only flags
//
#undef FLAG
#ifdef DEBUG
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif

// checks.cc
#ifdef ENABLE_SLOW_DCHECKS
DEFINE_BOOL(enable_slow_asserts, false,
            "enable asserts that are slow to execute")
#endif

// codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc
DEFINE_BOOL(print_ast, false, "print source AST")
DEFINE_BOOL(print_builtin_ast, false, "print source AST for builtins")
DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints")

// compiler.cc
DEFINE_BOOL(print_builtin_scopes, false, "print scopes for builtins")
DEFINE_BOOL(print_scopes, false, "print scopes")

// contexts.cc
DEFINE_BOOL(trace_contexts, false, "trace contexts operations")

// heap.cc
DEFINE_BOOL(gc_verbose, false, "print stuff during garbage collection")
DEFINE_BOOL(heap_stats, false, "report heap statistics before and after GC")
DEFINE_BOOL(code_stats, false, "report code statistics after GC")
DEFINE_BOOL(print_handles, false, "report handles after GC")
DEFINE_BOOL(check_handle_count, false,
            "Check that there are not too many handles at GC")
DEFINE_BOOL(print_global_handles, false, "report global handles after GC")

// TurboFan debug-only flags.
DEFINE_BOOL(print_turbo_replay, false,
            "print C++ code to recreate TurboFan graphs")
DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis")

// objects.cc
DEFINE_BOOL(trace_normalization, false,
            "prints when objects are turned into dictionaries.")

// runtime.cc
DEFINE_BOOL(trace_lazy, false, "trace lazy compilation")

// spaces.cc
DEFINE_BOOL(collect_heap_spill_statistics, false,
            "report heap spill statistics along with heap_stats "
            "(requires heap_stats)")
DEFINE_BOOL(trace_live_bytes, false,
            "trace incrementing and resetting of live bytes")

DEFINE_BOOL(trace_isolates, false, "trace isolate state changes")

// Regexp
DEFINE_BOOL(regexp_possessive_quantifier, false,
            "enable possessive quantifier syntax for testing")
DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
DEFINE_BOOL(trace_regexp_assembler, false,
            "trace regexp macro assembler calls.")
DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing")

// Debugger
DEFINE_BOOL(print_break_location, false, "print source location on debug break")

// wasm instance management
DEFINE_BOOL(trace_wasm_instances, false,
            "trace creation and collection of wasm instances")

//
// Logging and profiling flags
//
#undef FLAG
#define FLAG FLAG_FULL

// log.cc
DEFINE_BOOL(log, false,
            "Minimal logging (no API, code, GC, suspect, or handles samples).")
DEFINE_BOOL(log_all, false, "Log all events to the log file.")
DEFINE_BOOL(log_api, false, "Log API events to the log file.")
DEFINE_BOOL(log_code, false,
            "Log code events to the log file without profiling.")
DEFINE_BOOL(log_gc, false,
            "Log heap samples on garbage collection for the hp2ps tool.")
DEFINE_BOOL(log_handles, false, "Log global handle events.")
DEFINE_BOOL(log_suspect, false, "Log suspect operations.")
DEFINE_BOOL(prof, false,
            "Log statistical profiling information (implies --log-code).")
DEFINE_BOOL(prof_cpp, false, "Like --prof, but ignore generated code.")
DEFINE_IMPLICATION(prof, prof_cpp)
DEFINE_BOOL(prof_browser_mode, true,
            "Used with --prof, turns on browser-compatible mode for profiling.")
DEFINE_BOOL(log_regexp, false, "Log regular expression execution.")
DEFINE_STRING(logfile, "v8.log", "Specify the name of the log file.")
DEFINE_BOOL(logfile_per_isolate, true, "Separate log files for each isolate.")
DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.")
DEFINE_BOOL(perf_basic_prof, false,
            "Enable perf linux profiler (basic support).")
DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space)
DEFINE_BOOL(perf_basic_prof_only_functions, false,
            "Only report function code ranges to perf (i.e. no stubs).")
DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof)
DEFINE_BOOL(perf_prof, false,
            "Enable perf linux profiler (experimental annotate support).")
DEFINE_NEG_IMPLICATION(perf_prof, compact_code_space)
DEFINE_BOOL(perf_prof_debug_info, false,
            "Enable debug info for perf linux profiler (experimental).")
DEFINE_BOOL(perf_prof_unwinding_info, false,
            "Enable unwinding info for perf linux profiler (experimental).")
DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__",
              "Specify the name of the file for fake gc mmap used in ll_prof")
DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.")
DEFINE_BOOL(log_timer_events, false,
            "Time events including external callbacks.")
DEFINE_IMPLICATION(log_timer_events, log_internal_timer_events)
DEFINE_IMPLICATION(log_internal_timer_events, prof)
DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.")
DEFINE_STRING(log_instruction_file, "arm64_inst.csv",
              "AArch64 instruction statistics log file.")
DEFINE_INT(log_instruction_period, 1 << 22,
           "AArch64 instruction statistics logging period.")

DEFINE_BOOL(redirect_code_traces, false,
            "output deopt information and disassembly into file "
            "code-<pid>-<isolate id>.asm")
DEFINE_STRING(redirect_code_traces_to, NULL,
              "output deopt information and disassembly into the given file")

DEFINE_BOOL(hydrogen_track_positions, false,
            "track source code positions when building IR")

//
// Disassembler only flags
//
#undef FLAG
#ifdef ENABLE_DISASSEMBLER
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif

// elements.cc
DEFINE_BOOL(trace_elements_transitions, false, "trace elements transitions")

DEFINE_BOOL(trace_creation_allocation_sites, false,
            "trace the creation of allocation sites")

// code-stubs.cc
DEFINE_BOOL(print_code_stubs, false, "print code stubs")
DEFINE_BOOL(test_secondary_stub_cache, false,
            "test secondary stub cache by disabling the primary one")

DEFINE_BOOL(test_primary_stub_cache, false,
            "test primary stub cache by disabling the secondary one")


// codegen-ia32.cc / codegen-arm.cc
DEFINE_BOOL(print_code, false, "print generated code")
DEFINE_BOOL(print_opt_code, false, "print optimized code")
DEFINE_STRING(print_opt_code_filter, "*", "filter for printing optimized code")
DEFINE_BOOL(print_unopt_code, false,
            "print unoptimized code before "
            "printing optimized code based on it")
DEFINE_BOOL(print_code_verbose, false, "print more information for code")
DEFINE_BOOL(print_builtin_code, false, "print generated code for builtins")

#ifdef ENABLE_DISASSEMBLER
DEFINE_BOOL(sodium, false,
            "print generated code output suitable for use with "
            "the Sodium code viewer")

DEFINE_IMPLICATION(sodium, print_code_stubs)
DEFINE_IMPLICATION(sodium, print_code)
DEFINE_IMPLICATION(sodium, print_opt_code)
DEFINE_IMPLICATION(sodium, hydrogen_track_positions)
DEFINE_IMPLICATION(sodium, code_comments)

DEFINE_BOOL(print_all_code, false, "enable all flags related to printing code")
DEFINE_IMPLICATION(print_all_code, print_code)
DEFINE_IMPLICATION(print_all_code, print_opt_code)
DEFINE_IMPLICATION(print_all_code, print_unopt_code)
DEFINE_IMPLICATION(print_all_code, print_code_verbose)
DEFINE_IMPLICATION(print_all_code, print_builtin_code)
DEFINE_IMPLICATION(print_all_code, print_code_stubs)
DEFINE_IMPLICATION(print_all_code, code_comments)
#ifdef DEBUG
DEFINE_IMPLICATION(print_all_code, trace_codegen)
#endif
#endif


//
// VERIFY_PREDICTABLE related flags
//
#undef FLAG

#ifdef VERIFY_PREDICTABLE
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif

DEFINE_BOOL(verify_predictable, false,
            "this mode is used for checking that V8 behaves predictably")
DEFINE_INT(dump_allocations_digest_at_alloc, -1,
           "dump allocations digest each n-th allocation")


//
// Read-only flags
//
#undef FLAG
#define FLAG FLAG_READONLY

// assembler.h
DEFINE_BOOL(enable_embedded_constant_pool, V8_EMBEDDED_CONSTANT_POOL,
            "enable use of embedded constant pools (ARM/PPC only)")

DEFINE_BOOL(unbox_double_fields, V8_DOUBLE_FIELDS_UNBOXING,
            "enable in-object double fields unboxing (64-bit only)")
DEFINE_IMPLICATION(unbox_double_fields, track_double_fields)


// Cleanup...
#undef FLAG_FULL
#undef FLAG_READONLY
#undef FLAG
#undef FLAG_ALIAS

#undef DEFINE_BOOL
#undef DEFINE_MAYBE_BOOL
#undef DEFINE_INT
#undef DEFINE_STRING
#undef DEFINE_FLOAT
#undef DEFINE_ARGS
#undef DEFINE_IMPLICATION
#undef DEFINE_NEG_IMPLICATION
#undef DEFINE_NEG_VALUE_IMPLICATION
#undef DEFINE_VALUE_IMPLICATION
#undef DEFINE_ALIAS_BOOL
#undef DEFINE_ALIAS_INT
#undef DEFINE_ALIAS_STRING
#undef DEFINE_ALIAS_FLOAT
#undef DEFINE_ALIAS_ARGS

#undef FLAG_MODE_DECLARE
#undef FLAG_MODE_DEFINE
#undef FLAG_MODE_DEFINE_DEFAULTS
#undef FLAG_MODE_META
#undef FLAG_MODE_DEFINE_IMPLICATIONS

#undef COMMA