@@ -92,43 +92,61 @@ value to an empty string ("") disables persistent REPL history.
9292 type: bool default: false
9393 --strong_mode (experimental strong language mode)
9494 type: bool default: false
95+ --strong_this (don't allow 'this' to escape from constructors)
96+ type: bool default: true
9597 --es_staging (enable all completed harmony features)
9698 type: bool default: false
9799 --harmony (enable all completed harmony features)
98100 type: bool default: false
99- --harmony_shipping (enable all shipped harmony features)
101+ --harmony_shipping (enable all shipped harmony fetaures)
102+ type: bool default: true
103+ --legacy_const (legacy semantics for const in sloppy mode)
100104 type: bool default: true
101105 --harmony_modules (enable "harmony modules" (in progress))
102106 type: bool default: false
103- --harmony_arrays (enable "harmony array methods" (in progress))
104- type: bool default: false
105- --harmony_array_includes (enable "harmony Array.prototype.includes" (in progress))
106- type: bool default: false
107107 --harmony_regexps (enable "harmony regular expression extensions" (in progress))
108108 type: bool default: false
109- --harmony_arrow_functions (enable "harmony arrow functions" (in progress))
110- type: bool default: false
111109 --harmony_proxies (enable "harmony proxies" (in progress))
112110 type: bool default: false
113- --harmony_sloppy (enable "harmony features in sloppy mode " (in progress))
111+ --harmony_sloppy_function (enable "harmony sloppy function block scoping " (in progress))
114112 type: bool default: false
115- --harmony_unicode (enable "harmony unicode escapes " (in progress))
113+ --harmony_sloppy_let (enable "harmony let in sloppy mode " (in progress))
116114 type: bool default: false
117115 --harmony_unicode_regexps (enable "harmony unicode regexps" (in progress))
118116 type: bool default: false
119- --harmony_rest_parameters (enable "harmony rest parameters" (in progress))
120- type: bool default: false
121117 --harmony_reflect (enable "harmony Reflect API" (in progress))
122118 type: bool default: false
123- --harmony_computed_property_names (enable "harmony computed property names")
119+ --harmony_destructuring (enable "harmony destructuring" (in progress))
120+ type: bool default: false
121+ --harmony_default_parameters (enable "harmony default parameters" (in progress))
122+ type: bool default: false
123+ --harmony_sharedarraybuffer (enable "harmony sharedarraybuffer" (in progress))
124+ type: bool default: false
125+ --harmony_atomics (enable "harmony atomics" (in progress))
126+ type: bool default: false
127+ --harmony_simd (enable "harmony simd" (in progress))
128+ type: bool default: false
129+ --harmony_array_includes (enable "harmony Array.prototype.includes")
124130 type: bool default: false
125131 --harmony_tostring (enable "harmony toString")
126132 type: bool default: false
127- --harmony_numeric_literals (enable "harmony numeric literals")
133+ --harmony_concat_spreadable (enable "harmony isConcatSpreadable")
134+ type: bool default: false
135+ --harmony_rest_parameters (enable "harmony rest parameters")
136+ type: bool default: false
137+ --harmony_sloppy (enable "harmony features in sloppy mode")
138+ type: bool default: false
139+ --harmony_arrow_functions (enable "harmony arrow functions")
128140 type: bool default: true
129- --harmony_classes (enable "harmony classes (implies object literal extension) ")
141+ --harmony_new_target (enable "harmony new.target ")
130142 type: bool default: true
131- --harmony_object_literals (enable "harmony object literal extensions")
143+ --harmony_object_observe (enable "harmony Object.observe")
144+ type: bool default: true
145+ --harmony_spreadcalls (enable "harmony spread-calls")
146+ type: bool default: true
147+ --harmony_spread_arrays (enable "harmony spread in array literals")
148+ type: bool default: true
149+ --harmony_object (enable "harmony Object methods")
132150 type: bool default: true
133151 --compiled_keyed_generic_loads (use optimizing compiler to generate keyed generic load stubs)
134152 type: bool default: false
@@ -152,14 +170,20 @@ value to an empty string ("") disables persistent REPL history.
152170 type: bool default: true
153171 --smi_binop (support smi representation in binary operations)
154172 type: bool default: true
155- --vector_ics (support vector-based ics)
156- type: bool default: false
157- --optimize_for_size (Enables optimizations which favor memory size over execution speed.)
173+ --optimize_for_size (Enables optimizations which favor memory size over execution speed)
158174 type: bool default: false
159175 --unbox_double_arrays (automatically unbox arrays of doubles)
160176 type: bool default: true
161177 --string_slices (use string slices)
162178 type: bool default: true
179+ --ignition (use ignition interpreter)
180+ type: bool default: false
181+ --ignition_filter (filter for ignition interpreter)
182+ type: string default: ~~
183+ --print_bytecode (print bytecode generated by ignition interpreter)
184+ type: bool default: false
185+ --trace_ignition_codegen (trace the codegen of ignition interpreter bytecode handlers)
186+ type: bool default: false
163187 --crankshaft (use crankshaft)
164188 type: bool default: true
165189 --hydrogen_filter (optimization filter)
@@ -304,8 +328,6 @@ value to an empty string ("") disables persistent REPL history.
304328 type: bool default: true
305329 --concurrent_recompilation (optimizing hot functions asynchronously on a separate thread)
306330 type: bool default: true
307- --job_based_recompilation (post tasks to v8::Platform instead of using a thread for concurrent recompilation)
308- type: bool default: true
309331 --trace_concurrent_recompilation (track concurrent recompilation)
310332 type: bool default: false
311333 --concurrent_recompilation_queue_length (the length of the concurrent compilation queue)
@@ -318,8 +340,16 @@ value to an empty string ("") disables persistent REPL history.
318340 type: bool default: true
319341 --omit_map_checks_for_leaf_maps (do not emit check maps for constant values that have a leaf map, deoptimize the optimized code if the layout of the maps changes.)
320342 type: bool default: true
343+ --turbo (enable TurboFan compiler)
344+ type: bool default: false
345+ --turbo_shipping (enable TurboFan compiler on subset)
346+ type: bool default: true
347+ --turbo_greedy_regalloc (use the greedy register allocator)
348+ type: bool default: false
349+ --turbo_preprocess_ranges (run pre-register allocation heuristics)
350+ type: bool default: false
321351 --turbo_filter (optimization filter for TurboFan compiler)
322- type: string default: ~
352+ type: string default: ~~
323353 --trace_turbo (trace generated TurboFan IR)
324354 type: bool default: false
325355 --trace_turbo_graph (trace generated TurboFan graphs)
@@ -334,8 +364,12 @@ value to an empty string ("") disables persistent REPL history.
334364 type: bool default: false
335365 --trace_turbo_jt (trace TurboFan's jump threading)
336366 type: bool default: false
367+ --trace_turbo_ceq (trace TurboFan's control equivalence)
368+ type: bool default: false
337369 --turbo_asm (enable TurboFan for asm.js code)
338370 type: bool default: true
371+ --turbo_asm_deoptimization (enable deoptimization in TurboFan for asm.js code)
372+ type: bool default: false
339373 --turbo_verify (verify TurboFan graphs at each phase)
340374 type: bool default: false
341375 --turbo_stats (print TurboFan statistics)
@@ -346,24 +380,20 @@ value to an empty string ("") disables persistent REPL history.
346380 type: bool default: true
347381 --turbo_type_feedback (use type feedback in TurboFan)
348382 type: bool default: false
383+ --turbo_allocate (enable inline allocations in TurboFan)
384+ type: bool default: false
349385 --turbo_source_positions (track source code positions when building TurboFan IR)
350386 type: bool default: false
351387 --context_specialization (enable context specialization in TurboFan)
352388 type: bool default: false
353- --turbo_deoptimization (enable deoptimization in TurboFan)
354- type: bool default: false
355389 --turbo_inlining (enable inlining in TurboFan)
356390 type: bool default: false
357- --turbo_builtin_inlining (enable builtin inlining in TurboFan)
358- type: bool default: true
359391 --trace_turbo_inlining (trace TurboFan inlining)
360392 type: bool default: false
361393 --loop_assignment_analysis (perform loop assignment analysis)
362394 type: bool default: true
363395 --turbo_profiling (enable profiling in TurboFan)
364396 type: bool default: false
365- --turbo_delay_ssa_decon (delay ssa deconstruction in TurboFan register allocator)
366- type: bool default: false
367397 --turbo_verify_allocation (verify register allocation in TurboFan)
368398 type: bool default: false
369399 --turbo_move_optimization (optimize gap moves in TurboFan)
@@ -372,12 +402,20 @@ value to an empty string ("") disables persistent REPL history.
372402 type: bool default: true
373403 --turbo_osr (enable OSR in TurboFan)
374404 type: bool default: true
375- --turbo_exceptions (enable exception handling in TurboFan)
405+ --turbo_try_catch (enable try-catch support in TurboFan)
406+ type: bool default: true
407+ --turbo_try_finally (enable try-finally support in TurboFan)
376408 type: bool default: false
377409 --turbo_stress_loop_peeling (stress loop peeling optimization)
378410 type: bool default: false
379411 --turbo_cf_optimization (optimize control flow in TurboFan)
380412 type: bool default: true
413+ --turbo_frame_elision (elide frames in TurboFan)
414+ type: bool default: true
415+ --turbo_cache_shared_code (cache context-independent code)
416+ type: bool default: true
417+ --turbo_preserve_shared_code (keep context-independent code)
418+ type: bool default: false
381419 --typed_array_max_size_in_heap (threshold for in-heap typed array)
382420 type: int default: 64
383421 --frame_count (number of stack frames inspected by the profiler)
@@ -406,6 +444,14 @@ value to an empty string ("") disables persistent REPL history.
406444 type: bool default: true
407445 --enable_fma3 (enable use of FMA3 instructions if available)
408446 type: bool default: true
447+ --enable_bmi1 (enable use of BMI1 instructions if available)
448+ type: bool default: true
449+ --enable_bmi2 (enable use of BMI2 instructions if available)
450+ type: bool default: true
451+ --enable_lzcnt (enable use of LZCNT instruction if available)
452+ type: bool default: true
453+ --enable_popcnt (enable use of POPCNT instruction if available)
454+ type: bool default: true
409455 --enable_vfp3 (enable use of VFP3 instructions if available)
410456 type: bool default: true
411457 --enable_armv7 (enable use of ARMv7 instructions if available (ARM only))
@@ -548,28 +594,26 @@ value to an empty string ("") disables persistent REPL history.
548594 type: bool default: false
549595 --trace_gc_verbose (print more details following each garbage collection)
550596 type: bool default: false
597+ --trace_allocation_stack_interval (print stack trace after <n> free-list allocations)
598+ type: int default: -1
551599 --trace_fragmentation (report fragmentation for old space)
552600 type: bool default: false
553601 --trace_fragmentation_verbose (report fragmentation for old space (detailed))
554602 type: bool default: false
555- --collect_maps (garbage collect maps from which no objects can be reached )
556- type: bool default: true
603+ --trace_mutator_utilization (print mutator utilization, allocation speed, gc speed )
604+ type: bool default: false
557605 --weak_embedded_maps_in_optimized_code (make maps embedded in optimized code weak)
558606 type: bool default: true
559607 --weak_embedded_objects_in_optimized_code (make objects embedded in optimized code weak)
560608 type: bool default: true
561- --flush_code (flush code that we expect not to use again (during full gc))
562- type: bool default: true
563- --flush_code_incrementally (flush code that we expect not to use again (incrementally))
609+ --flush_code (flush code that we expect not to use again)
564610 type: bool default: true
565611 --trace_code_flushing (trace code flushing progress)
566612 type: bool default: false
567613 --age_code (track un-executed functions to age code and flush only old code (required for code flushing))
568614 type: bool default: true
569615 --incremental_marking (use incremental marking)
570616 type: bool default: true
571- --incremental_marking_steps (do incremental marking steps)
572- type: bool default: true
573617 --overapproximate_weak_closure (overapproximate weak closer to reduce atomic pause time)
574618 type: bool default: true
575619 --min_progress_during_object_groups_marking (keep overapproximating the weak closure as long as we discover at least this many unmarked objects)
@@ -582,10 +626,14 @@ value to an empty string ("") disables persistent REPL history.
582626 type: bool default: false
583627 --track_gc_object_stats (track object counts and memory usage)
584628 type: bool default: false
629+ --trace_gc_object_stats (trace object counts and memory usage)
630+ type: bool default: false
585631 --track_detached_contexts (track native contexts that are expected to be garbage collected)
586632 type: bool default: true
587633 --trace_detached_contexts (trace native contexts that are expected to be garbage collected)
588634 type: bool default: false
635+ --histogram_interval (time interval in ms for aggregating memory histograms)
636+ type: int default: 600000
589637 --heap_profiler_trace_objects (Dump heap object allocations/movements/size_updates)
590638 type: bool default: false
591639 --use_idle_notification (Use idle notification to reduce memory footprint.)
@@ -594,28 +642,34 @@ value to an empty string ("") disables persistent REPL history.
594642 type: bool default: true
595643 --trace_ic (trace inline cache state transitions)
596644 type: bool default: false
645+ --vector_stores (use vectors for store ics)
646+ type: bool default: false
647+ --global_var_shortcuts (use ic-less global loads and stores)
648+ type: bool default: false
597649 --native_code_counters (generate extra code for manipulating stats counters)
598650 type: bool default: false
599651 --always_compact (Perform compaction on every full GC)
600652 type: bool default: false
601653 --never_compact (Never perform compaction on full GC - testing only)
602654 type: bool default: false
603- --compact_code_space (Compact code space on full non-incremental collections)
604- type: bool default: true
605- --incremental_code_compaction (Compact code space on full incremental collections)
655+ --compact_code_space (Compact code space on full collections)
606656 type: bool default: true
607657 --cleanup_code_caches_at_gc (Flush inline caches prior to mark compact collection and flush code caches in maps during mark compact cycle.)
608658 type: bool default: true
609659 --use_marking_progress_bar (Use a progress bar to scan large objects in increments when incremental marking is active.)
610660 type: bool default: true
611661 --zap_code_space (Zap free memory in code space with 0xCC while sweeping.)
612- type: bool default: true
662+ type: bool default: false
613663 --random_seed (Default seed for initializing random generator (0, the default, means to use system random).)
614664 type: int default: 0
615- --trace_weak_arrays (trace WeakFixedArray usage)
665+ --trace_weak_arrays (Trace WeakFixedArray usage)
616666 type: bool default: false
617- --track_prototype_users (keep track of which maps refer to a given prototype object)
667+ --track_prototype_users (Keep track of which maps refer to a given prototype object)
618668 type: bool default: false
669+ --trace_prototype_users (Trace updates to prototype user tracking)
670+ type: bool default: false
671+ --eliminate_prototype_chain_checks (Collapse prototype chain checks into single-cell checks)
672+ type: bool default: true
619673 --use_verbose_printer (allows verbose printing)
620674 type: bool default: true
621675 --allow_natives_syntax (allow natives syntax)
@@ -632,7 +686,7 @@ value to an empty string ("") disables persistent REPL history.
632686 type: int default: 0
633687 --sim_stack_alignment (Stack alingment in bytes in simulator (4 or 8, 8 is default))
634688 type: int default: 8
635- --sim_stack_size (Stack size of the ARM64 and MIPS64 simulator in kBytes (default is 2 MB))
689+ --sim_stack_size (Stack size of the ARM64, MIPS64 and PPC64 simulator in kBytes (default is 2 MB))
636690 type: int default: 2048
637691 --log_regs_modified (When logging register values, only print modified registers.)
638692 type: bool default: true
@@ -652,6 +706,8 @@ value to an empty string ("") disables persistent REPL history.
652706 type: int default: 0
653707 --profile_deserialization (Print the time it takes to deserialize the snapshot.)
654708 type: bool default: false
709+ --serialization_statistics (Collect statistics on serialized objects.)
710+ type: bool default: false
655711 --regexp_optimization (generate optimized regexp code)
656712 type: bool default: true
657713 --testing_bool_flag (testing_bool_flag)
@@ -680,12 +736,12 @@ value to an empty string ("") disables persistent REPL history.
680736 type: bool default: false
681737 --manual_evacuation_candidates_selection (Test mode only flag. It allows an unit test to select evacuation candidates pages (requires --stress_compaction).)
682738 type: bool default: false
739+ --external_allocation_limit_incremental_time (Time spent in incremental marking steps (in ms) once the external allocation limit is reached)
740+ type: int default: 1
683741 --help (Print usage message, including flags, on console)
684742 type: bool default: true
685743 --dump_counters (Dump counters on exit)
686744 type: bool default: false
687- --debugger (Enable JavaScript debugger)
688- type: bool default: false
689745 --map_counters (Map counters to a file)
690746 type: string default:
691747 --js_arguments (Pass all remaining arguments to the script. Alias for "--".)
@@ -722,7 +778,7 @@ value to an empty string ("") disables persistent REPL history.
722778 type: bool default: false
723779 --perf_basic_prof (Enable perf linux profiler (basic support).)
724780 type: bool default: false
725- --perf_jit_prof (Enable perf linux profiler (experimental annotate support ).)
781+ --perf_basic_prof_only_functions (Only report function code ranges to perf (i.e. no stubs ).)
726782 type: bool default: false
727783 --gc_fake_mmap (Specify the name of the file for fake gc mmap used in ll_prof)
728784 type: string default: /tmp/__v8_gc__
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