.TH IO.JS "1" "2010" "" ""

.SH "NAME"

iojs \- Server-side JavaScript

.SH SYNOPSIS

.B iojs

[

.B \-v

]

[

.B \-\-debug

|

.B \-\-debug-brk

]

[

.B \-\-v8-options

]

.br

[

.B \-e

.I command

|

.I script.js

]

[

.I arguments

]

Execute without arguments to start the REPL.

.SH DESCRIPTION

io.js is a set of libraries for javascript which allows

it to be used outside of the browser. It is primarily

focused on creating simple, easy to build network clients

and servers.

.SH OPTIONS

-v, --version print iojs's version

-e, --eval script evaluate script

-p, --print print result of --eval

-i, --interactive always enter the REPL even if stdin

does not appear to be a terminal

-r, --require module to preload at startup

--no-deprecation silence deprecation warnings

--trace-deprecation show stack traces on deprecations

--throw-deprecation throw errors on deprecations

--track-heap-objects track heap object allocations for heap snapshots

--v8-options print v8 command line options

.SH ENVIRONMENT VARIABLES

.IP NODE_PATH

\':\'\-separated list of directories prefixed to the module search path.

.IP NODE_DISABLE_COLORS

If set to 1 then colors will not be used in the REPL.

.SH V8 OPTIONS

--use_strict (enforce strict mode)

type: bool default: false

--es_staging (enable all completed harmony features)

type: bool default: false

--harmony (enable all completed harmony features)

type: bool default: false

--harmony_shipping (enable all shipped harmony features)

type: bool default: true

--harmony_modules (enable "harmony modules (implies block scoping)" (in progress))

type: bool default: false

--harmony_arrays (enable "harmony array methods" (in progress))

type: bool default: false

--harmony_array_includes (enable "harmony Array.prototype.includes" (in progress))

type: bool default: false

--harmony_regexps (enable "harmony regular expression extensions" (in progress))

type: bool default: false

--harmony_arrow_functions (enable "harmony arrow functions" (in progress))

type: bool default: false

--harmony_proxies (enable "harmony proxies" (in progress))

type: bool default: false

--harmony_sloppy (enable "harmony features in sloppy mode" (in progress))

type: bool default: false

--harmony_unicode (enable "harmony unicode escapes" (in progress))

type: bool default: false

--harmony_tostring (enable "harmony toString")

type: bool default: false

--harmony_numeric_literals (enable "harmony numeric literals")

type: bool default: true

--harmony_strings (enable "harmony string methods")

type: bool default: true

--harmony_scoping (enable "harmony block scoping")

type: bool default: true

--harmony_classes (enable "harmony classes (implies block scoping & object literal extension)")

type: bool default: true

--harmony_object_literals (enable "harmony object literal extensions")

type: bool default: true

--harmony_templates (enable "harmony template literals")

type: bool default: true

--compiled_keyed_generic_loads (use optimizing compiler to generate keyed generic load stubs)

type: bool default: false

--pretenuring_call_new (pretenure call new)

type: bool default: false

--allocation_site_pretenuring (pretenure with allocation sites)

type: bool default: true

--trace_pretenuring (trace pretenuring decisions of HAllocate instructions)

type: bool default: false

--trace_pretenuring_statistics (trace allocation site pretenuring statistics)

type: bool default: false

--track_fields (track fields with only smi values)

type: bool default: true

--track_double_fields (track fields with double values)

type: bool default: true

--track_heap_object_fields (track fields with heap values)

type: bool default: true

--track_computed_fields (track computed boilerplate fields)

type: bool default: true

--track_field_types (track field types)

type: bool default: true

--smi_binop (support smi representation in binary operations)

type: bool default: true

--vector_ics (support vector-based ics)

type: bool default: false

--optimize_for_size (Enables optimizations which favor memory size over execution speed.)

type: bool default: false

--unbox_double_arrays (automatically unbox arrays of doubles)

type: bool default: true

--string_slices (use string slices)

type: bool default: true

--crankshaft (use crankshaft)

type: bool default: true

--hydrogen_filter (optimization filter)

type: string default: *

--use_gvn (use hydrogen global value numbering)

type: bool default: true

--gvn_iterations (maximum number of GVN fix-point iterations)

type: int default: 3

--use_canonicalizing (use hydrogen instruction canonicalizing)

type: bool default: true

--use_inlining (use function inlining)

type: bool default: true

--use_escape_analysis (use hydrogen escape analysis)

type: bool default: true

--use_allocation_folding (use allocation folding)

type: bool default: true

--use_local_allocation_folding (only fold in basic blocks)

type: bool default: false

--use_write_barrier_elimination (eliminate write barriers targeting allocations in optimized code)

type: bool default: true

--max_inlining_levels (maximum number of inlining levels)

type: int default: 5

--max_inlined_source_size (maximum source size in bytes considered for a single inlining)

type: int default: 600

--max_inlined_nodes (maximum number of AST nodes considered for a single inlining)

type: int default: 196

--max_inlined_nodes_cumulative (maximum cumulative number of AST nodes considered for inlining)

type: int default: 400

--loop_invariant_code_motion (loop invariant code motion)

type: bool default: true

--fast_math (faster (but maybe less accurate) math functions)

type: bool default: true

--collect_megamorphic_maps_from_stub_cache (crankshaft harvests type feedback from stub cache)

type: bool default: true

--hydrogen_stats (print statistics for hydrogen)

type: bool default: false

--trace_check_elimination (trace check elimination phase)

type: bool default: false

--trace_hydrogen (trace generated hydrogen to file)

type: bool default: false

--trace_hydrogen_filter (hydrogen tracing filter)

type: string default: *

--trace_hydrogen_stubs (trace generated hydrogen for stubs)

type: bool default: false

--trace_hydrogen_file (trace hydrogen to given file name)

type: string default: NULL

--trace_phase (trace generated IR for specified phases)

type: string default: HLZ

--trace_inlining (trace inlining decisions)

type: bool default: false

--trace_load_elimination (trace load elimination)

type: bool default: false

--trace_store_elimination (trace store elimination)

type: bool default: false

--trace_alloc (trace register allocator)

type: bool default: false

--trace_all_uses (trace all use positions)

type: bool default: false

--trace_range (trace range analysis)

type: bool default: false

--trace_gvn (trace global value numbering)

type: bool default: false

--trace_representation (trace representation types)

type: bool default: false

--trace_removable_simulates (trace removable simulates)

type: bool default: false

--trace_escape_analysis (trace hydrogen escape analysis)

type: bool default: false

--trace_allocation_folding (trace allocation folding)

type: bool default: false

--trace_track_allocation_sites (trace the tracking of allocation sites)

type: bool default: false

--trace_migration (trace object migration)

type: bool default: false

--trace_generalization (trace map generalization)

type: bool default: false

--stress_pointer_maps (pointer map for every instruction)

type: bool default: false

--stress_environments (environment for every instruction)

type: bool default: false

--deopt_every_n_times (deoptimize every n times a deopt point is passed)

type: int default: 0

--deopt_every_n_garbage_collections (deoptimize every n garbage collections)

type: int default: 0

--print_deopt_stress (print number of possible deopt points)

type: bool default: false

--trap_on_deopt (put a break point before deoptimizing)

type: bool default: false

--trap_on_stub_deopt (put a break point before deoptimizing a stub)

type: bool default: false

--deoptimize_uncommon_cases (deoptimize uncommon cases)

type: bool default: true

--polymorphic_inlining (polymorphic inlining)

type: bool default: true

--use_osr (use on-stack replacement)

type: bool default: true

--array_bounds_checks_elimination (perform array bounds checks elimination)

type: bool default: true

--trace_bce (trace array bounds check elimination)

type: bool default: false

--array_bounds_checks_hoisting (perform array bounds checks hoisting)

type: bool default: false

--array_index_dehoisting (perform array index dehoisting)

type: bool default: true

--analyze_environment_liveness (analyze liveness of environment slots and zap dead values)

type: bool default: true

--load_elimination (use load elimination)

type: bool default: true

--check_elimination (use check elimination)

type: bool default: true

--store_elimination (use store elimination)

type: bool default: false

--dead_code_elimination (use dead code elimination)

type: bool default: true

--fold_constants (use constant folding)

type: bool default: true

--trace_dead_code_elimination (trace dead code elimination)

type: bool default: false

--unreachable_code_elimination (eliminate unreachable code)

type: bool default: true

--trace_osr (trace on-stack replacement)

type: bool default: false

--stress_runs (number of stress runs)

type: int default: 0

--lookup_sample_by_shared (when picking a function to optimize, watch for shared function info, not JSFunction itself)

type: bool default: true

--cache_optimized_code (cache optimized code for closures)

type: bool default: true

--flush_optimized_code_cache (flushes the cache of optimized code for closures on every GC)

type: bool default: true

--inline_construct (inline constructor calls)

type: bool default: true

--inline_arguments (inline functions with arguments object)

type: bool default: true

--inline_accessors (inline JavaScript accessors)

type: bool default: true

--escape_analysis_iterations (maximum number of escape analysis fix-point iterations)

type: int default: 2

--optimize_for_in (optimize functions containing for-in loops)

type: bool default: true

--concurrent_recompilation (optimizing hot functions asynchronously on a separate thread)

type: bool default: true

--job_based_recompilation (post tasks to v8::Platform instead of using a thread for concurrent recompilation)

type: bool default: false

--trace_concurrent_recompilation (track concurrent recompilation)

type: bool default: false

--concurrent_recompilation_queue_length (the length of the concurrent compilation queue)

type: int default: 8

--concurrent_recompilation_delay (artificial compilation delay in ms)

type: int default: 0

--block_concurrent_recompilation (block queued jobs until released)

type: bool default: false

--concurrent_osr (concurrent on-stack replacement)

type: bool default: true

--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.)

type: bool default: true

--turbo_filter (optimization filter for TurboFan compiler)

type: string default: ~

--trace_turbo (trace generated TurboFan IR)

type: bool default: false

--trace_turbo_graph (trace generated TurboFan graphs)

type: bool default: false

--trace_turbo_cfg_file (trace turbo cfg graph (for C1 visualizer) to a given file name)

type: string default: NULL

--trace_turbo_types (trace TurboFan's types)

type: bool default: true

--trace_turbo_scheduler (trace TurboFan's scheduler)

type: bool default: false

--trace_turbo_reduction (trace TurboFan's various reducers)

type: bool default: false

--trace_turbo_jt (trace TurboFan's jump threading)

type: bool default: false

--turbo_asm (enable TurboFan for asm.js code)

type: bool default: true

--turbo_verify (verify TurboFan graphs at each phase)

type: bool default: false

--turbo_stats (print TurboFan statistics)

type: bool default: false

--turbo_types (use typed lowering in TurboFan)

type: bool default: true

--turbo_source_positions (track source code positions when building TurboFan IR)

type: bool default: false

--context_specialization (enable context specialization in TurboFan)

type: bool default: false

--turbo_deoptimization (enable deoptimization in TurboFan)

type: bool default: false

--turbo_inlining (enable inlining in TurboFan)

type: bool default: false

--turbo_inlining_intrinsics (enable inlining of intrinsics in TurboFan)

type: bool default: false

--trace_turbo_inlining (trace TurboFan inlining)

type: bool default: false

--loop_assignment_analysis (perform loop assignment analysis)

type: bool default: true

--turbo_profiling (enable profiling in TurboFan)

type: bool default: false

--turbo_reuse_spill_slots (reuse spill slots in TurboFan)

type: bool default: true

--turbo_delay_ssa_decon (delay ssa deconstruction in TurboFan register allocator)

type: bool default: false

--turbo_move_optimization (optimize gap moves in TurboFan)

type: bool default: true

--turbo_jt (enable jump threading)

type: bool default: true

--typed_array_max_size_in_heap (threshold for in-heap typed array)

type: int default: 64

--frame_count (number of stack frames inspected by the profiler)

type: int default: 1

--interrupt_budget (execution budget before interrupt is triggered)

type: int default: 6144

--type_info_threshold (percentage of ICs that must have type info to allow optimization)

type: int default: 25

--generic_ic_threshold (max percentage of megamorphic/generic ICs to allow optimization)

type: int default: 30

--self_opt_count (call count before self-optimization)

type: int default: 130

--trace_opt_verbose (extra verbose compilation tracing)

type: bool default: false

--debug_code (generate extra code (assertions) for debugging)

type: bool default: false

--code_comments (emit comments in code disassembly)

type: bool default: false

--enable_sse3 (enable use of SSE3 instructions if available)

type: bool default: true

--enable_sse4_1 (enable use of SSE4.1 instructions if available)

type: bool default: true

--enable_sahf (enable use of SAHF instruction if available (X64 only))

type: bool default: true

--enable_avx (enable use of AVX instructions if available)

type: bool default: true

--enable_fma3 (enable use of FMA3 instructions if available)

type: bool default: true

--enable_vfp3 (enable use of VFP3 instructions if available)

type: bool default: true

--enable_armv7 (enable use of ARMv7 instructions if available (ARM only))

type: bool default: true

--enable_armv8 (enable use of ARMv8 instructions if available (ARM 32-bit only))

type: bool default: true

--enable_neon (enable use of NEON instructions if available (ARM only))

type: bool default: true

--enable_sudiv (enable use of SDIV and UDIV instructions if available (ARM only))

type: bool default: true

--enable_mls (enable use of MLS instructions if available (ARM only))

type: bool default: true

--enable_movw_movt (enable loading 32-bit constant by means of movw/movt instruction pairs (ARM only))

type: bool default: false

--enable_unaligned_accesses (enable unaligned accesses for ARMv7 (ARM only))

type: bool default: true

--enable_32dregs (enable use of d16-d31 registers on ARM - this requires VFP3)

type: bool default: true

--enable_vldr_imm (enable use of constant pools for double immediate (ARM only))

type: bool default: false

--force_long_branches (force all emitted branches to be in long mode (MIPS only))

type: bool default: false

--expose_natives_as (expose natives in global object)

type: string default: NULL

--expose_debug_as (expose debug in global object)

type: string default: NULL

--expose_free_buffer (expose freeBuffer extension)

type: bool default: false

--expose_gc (expose gc extension)

type: bool default: false

--expose_gc_as (expose gc extension under the specified name)

type: string default: NULL

--expose_externalize_string (expose externalize string extension)

type: bool default: false

--expose_trigger_failure (expose trigger-failure extension)

type: bool default: false

--stack_trace_limit (number of stack frames to capture)

type: int default: 10

--builtins_in_stack_traces (show built-in functions in stack traces)

type: bool default: false

--disable_native_files (disable builtin natives files)

type: bool default: false

--inline_new (use fast inline allocation)

type: bool default: true

--trace_codegen (print name of functions for which code is generated)

type: bool default: false

--trace (trace function calls)

type: bool default: false

--mask_constants_with_cookie (use random jit cookie to mask large constants)

type: bool default: true

--lazy (use lazy compilation)

type: bool default: true

--trace_opt (trace lazy optimization)

type: bool default: false

--trace_opt_stats (trace lazy optimization statistics)

type: bool default: false

--opt (use adaptive optimizations)

type: bool default: true

--always_opt (always try to optimize functions)

type: bool default: false

--always_osr (always try to OSR functions)

type: bool default: false

--prepare_always_opt (prepare for turning on always opt)

type: bool default: false

--trace_deopt (trace optimize function deoptimization)

type: bool default: false

--trace_stub_failures (trace deoptimization of generated code stubs)

type: bool default: false

--serialize_toplevel (enable caching of toplevel scripts)

type: bool default: true

--serialize_inner (enable caching of inner functions)

type: bool default: false

--trace_serializer (print code serializer trace)

type: bool default: false

--min_preparse_length (minimum length for automatic enable preparsing)

type: int default: 1024

--max_opt_count (maximum number of optimization attempts before giving up.)

type: int default: 10

--compilation_cache (enable compilation cache)

type: bool default: true

--cache_prototype_transitions (cache prototype transitions)

type: bool default: true

--cpu_profiler_sampling_interval (CPU profiler sampling interval in microseconds)

type: int default: 1000

--trace_debug_json (trace debugging JSON request/response)

type: bool default: false

--trace_js_array_abuse (trace out-of-bounds accesses to JS arrays)

type: bool default: false

--trace_external_array_abuse (trace out-of-bounds-accesses to external arrays)

type: bool default: false

--trace_array_abuse (trace out-of-bounds accesses to all arrays)

type: bool default: false

--enable_liveedit (enable liveedit experimental feature)

type: bool default: true

--hard_abort (abort by crashing)

type: bool default: true

--stack_size (default size of stack region v8 is allowed to use (in kBytes))

type: int default: 984

--max_stack_trace_source_length (maximum length of function source code printed in a stack trace.)

type: int default: 300

--always_inline_smi_code (always inline smi code in non-opt code)

type: bool default: false

--min_semi_space_size (min size of a semi-space (in MBytes), the new space consists of twosemi-spaces)

type: int default: 0

--target_semi_space_size (target size of a semi-space (in MBytes) before triggering a GC)

type: int default: 0

--max_semi_space_size (max size of a semi-space (in MBytes), the new space consists of twosemi-spaces)

type: int default: 0

--semi_space_growth_factor (factor by which to grow the new space)

type: int default: 2

--experimental_new_space_growth_heuristic (Grow the new space based on the percentage of survivors instead of their absolute value.)

type: bool default: false

--max_old_space_size (max size of the old space (in Mbytes))

type: int default: 0

--initial_old_space_size (initial old space size (in Mbytes))

type: int default: 0

--max_executable_size (max size of executable memory (in Mbytes))

type: int default: 0

--gc_global (always perform global GCs)

type: bool default: false

--gc_interval (garbage collect after <n> allocations)

type: int default: -1

--trace_gc (print one trace line following each garbage collection)

type: bool default: false

--trace_gc_nvp (print one detailed trace line in name=value format after each garbage collection)

type: bool default: false

--trace_gc_ignore_scavenger (do not print trace line after scavenger collection)

type: bool default: false

--trace_idle_notification (print one trace line following each idle notification)

type: bool default: false

--trace_idle_notification_verbose (prints the heap state used by the idle notification)

type: bool default: false

--print_cumulative_gc_stat (print cumulative GC statistics in name=value format on exit)

type: bool default: false

--print_max_heap_committed (print statistics of the maximum memory committed for the heap in name=value format on exit)

type: bool default: false

--trace_gc_verbose (print more details following each garbage collection)

type: bool default: false

--trace_fragmentation (report fragmentation for old pointer and data pages)

type: bool default: false

--collect_maps (garbage collect maps from which no objects can be reached)

type: bool default: true

--weak_embedded_maps_in_optimized_code (make maps embedded in optimized code weak)

type: bool default: true

--weak_embedded_objects_in_optimized_code (make objects embedded in optimized code weak)

type: bool default: true

--flush_code (flush code that we expect not to use again (during full gc))

type: bool default: true

--flush_code_incrementally (flush code that we expect not to use again (incrementally))

type: bool default: true

--trace_code_flushing (trace code flushing progress)

type: bool default: false

--age_code (track un-executed functions to age code and flush only old code (required for code flushing))

type: bool default: true

--incremental_marking (use incremental marking)

type: bool default: true

--incremental_marking_steps (do incremental marking steps)

type: bool default: true

--concurrent_sweeping (use concurrent sweeping)

type: bool default: true

--trace_incremental_marking (trace progress of the incremental marking)

type: bool default: false

--track_gc_object_stats (track object counts and memory usage)

type: bool default: false

--heap_profiler_trace_objects (Dump heap object allocations/movements/size_updates)

type: bool default: false

--use_idle_notification (Use idle notification to reduce memory footprint.)

type: bool default: true

--use_ic (use inline caching)

type: bool default: true

--trace_ic (trace inline cache state transitions)

type: bool default: false

--native_code_counters (generate extra code for manipulating stats counters)

type: bool default: false

--always_compact (Perform compaction on every full GC)

type: bool default: false

--never_compact (Never perform compaction on full GC - testing only)

type: bool default: false

--compact_code_space (Compact code space on full non-incremental collections)

type: bool default: true

--incremental_code_compaction (Compact code space on full incremental collections)

type: bool default: true

--cleanup_code_caches_at_gc (Flush inline caches prior to mark compact collection and flush code caches in maps during mark compact cycle.)

type: bool default: true

--use_marking_progress_bar (Use a progress bar to scan large objects in increments when incremental marking is active.)

type: bool default: true

--zap_code_space (Zap free memory in code space with 0xCC while sweeping.)

type: bool default: true

--random_seed (Default seed for initializing random generator (0, the default, means to use system random).)

type: int default: 0

--trace_weak_arrays (trace WeakFixedArray usage)

type: bool default: false

--track_prototype_users (keep track of which maps refer to a given prototype object)

type: bool default: false

--use_verbose_printer (allows verbose printing)

type: bool default: true

--allow_natives_syntax (allow natives syntax)

type: bool default: false

--trace_parse (trace parsing and preparsing)

type: bool default: false

--trace_sim (Trace simulator execution)

type: bool default: false

--debug_sim (Enable debugging the simulator)

type: bool default: false

--check_icache (Check icache flushes in ARM and MIPS simulator)

type: bool default: false

--stop_sim_at (Simulator stop after x number of instructions)

type: int default: 0

--sim_stack_alignment (Stack alingment in bytes in simulator (4 or 8, 8 is default))

type: int default: 8

--sim_stack_size (Stack size of the ARM64 and MIPS64 simulator in kBytes (default is 2 MB))

type: int default: 2048

--log_regs_modified (When logging register values, only print modified registers.)

type: bool default: true

--log_colour (When logging, try to use coloured output.)

type: bool default: true

--ignore_asm_unimplemented_break (Don't break for ASM_UNIMPLEMENTED_BREAK macros.)

type: bool default: false

--trace_sim_messages (Trace simulator debug messages. Implied by --trace-sim.)

type: bool default: false

--stack_trace_on_illegal (print stack trace when an illegal exception is thrown)

type: bool default: false

--abort_on_uncaught_exception (abort program (dump core) when an uncaught exception is thrown)

type: bool default: false

--randomize_hashes (randomize hashes to avoid predictable hash collisions (with snapshots this option cannot override the baked-in seed))

type: bool default: true

--hash_seed (Fixed seed to use to hash property keys (0 means random)(with snapshots this option cannot override the baked-in seed))

type: int default: 0

--profile_deserialization (Print the time it takes to deserialize the snapshot.)

type: bool default: false

--regexp_optimization (generate optimized regexp code)

type: bool default: true

--testing_bool_flag (testing_bool_flag)

type: bool default: true

--testing_maybe_bool_flag (testing_maybe_bool_flag)

type: maybe_bool default: unset

--testing_int_flag (testing_int_flag)

type: int default: 13

--testing_float_flag (float-flag)

type: float default: 2.5

--testing_string_flag (string-flag)

type: string default: Hello, world!

--testing_prng_seed (Seed used for threading test randomness)

type: int default: 42

--testing_serialization_file (file in which to serialize heap)

type: string default: /tmp/serdes

--startup_blob (Write V8 startup blob file. (mksnapshot only))

type: string default: NULL

--profile_hydrogen_code_stub_compilation (Print the time it takes to lazily compile hydrogen code stubs.)

type: bool default: false

--predictable (enable predictable mode)

type: bool default: false

--help (Print usage message, including flags, on console)

type: bool default: true

--dump_counters (Dump counters on exit)

type: bool default: false

--debugger (Enable JavaScript debugger)

type: bool default: false

--map_counters (Map counters to a file)

type: string default:

--js_arguments (Pass all remaining arguments to the script. Alias for "--".)

type: arguments default:

--gdbjit (enable GDBJIT interface (disables compacting GC))

type: bool default: false

--gdbjit_full (enable GDBJIT interface for all code objects)

type: bool default: false

--gdbjit_dump (dump elf objects with debug info to disk)

type: bool default: false

--gdbjit_dump_filter (dump only objects containing this substring)

type: string default:

--force_marking_deque_overflows (force overflows of marking deque by reducing it's size to 64 words)

type: bool default: false

--stress_compaction (stress the GC compactor to flush out bugs (implies --force_marking_deque_overflows))

type: bool default: false

--log (Minimal logging (no API, code, GC, suspect, or handles samples).)

type: bool default: false

--log_all (Log all events to the log file.)

type: bool default: false

--log_api (Log API events to the log file.)

type: bool default: false

--log_code (Log code events to the log file without profiling.)

type: bool default: false

--log_gc (Log heap samples on garbage collection for the hp2ps tool.)

type: bool default: false

--log_handles (Log global handle events.)

type: bool default: false

--log_snapshot_positions (log positions of (de)serialized objects in the snapshot.)

type: bool default: false

--log_suspect (Log suspect operations.)

type: bool default: false

--prof (Log statistical profiling information (implies --log-code).)

type: bool default: false

--prof_browser_mode (Used with --prof, turns on browser-compatible mode for profiling.)

type: bool default: true

--log_regexp (Log regular expression execution.)

type: bool default: false

--logfile (Specify the name of the log file.)

type: string default: v8.log

--logfile_per_isolate (Separate log files for each isolate.)

type: bool default: true

--ll_prof (Enable low-level linux profiler.)

type: bool default: false

--perf_basic_prof (Enable perf linux profiler (basic support).)

type: bool default: false

--perf_jit_prof (Enable perf linux profiler (experimental annotate support).)

type: bool default: false

--gc_fake_mmap (Specify the name of the file for fake gc mmap used in ll_prof)

type: string default: /tmp/__v8_gc__

--log_internal_timer_events (Time internal events.)

type: bool default: false

--log_timer_events (Time events including external callbacks.)

type: bool default: false

--log_instruction_stats (Log AArch64 instruction statistics.)

type: bool default: false

--log_instruction_file (AArch64 instruction statistics log file.)

type: string default: arm64_inst.csv

--log_instruction_period (AArch64 instruction statistics logging period.)

type: int default: 4194304

--redirect_code_traces (output deopt information and disassembly into file code-<pid>-<isolate id>.asm)

type: bool default: false

--redirect_code_traces_to (output deopt information and disassembly into the given file)

type: string default: NULL

--hydrogen_track_positions (track source code positions when building IR)

type: bool default: false

--trace_elements_transitions (trace elements transitions)

type: bool default: false

--trace_creation_allocation_sites (trace the creation of allocation sites)

type: bool default: false

--print_code_stubs (print code stubs)

type: bool default: false

--test_secondary_stub_cache (test secondary stub cache by disabling the primary one)

type: bool default: false

--test_primary_stub_cache (test primary stub cache by disabling the secondary one)

type: bool default: false

--print_code (print generated code)

type: bool default: false

--print_opt_code (print optimized code)

type: bool default: false

--print_unopt_code (print unoptimized code before printing optimized code based on it)

type: bool default: false

--print_code_verbose (print more information for code)

type: bool default: false

--print_builtin_code (print generated code for builtins)

type: bool default: false

--sodium (print generated code output suitable for use with the Sodium code viewer)

type: bool default: false

--print_all_code (enable all flags related to printing code)

type: bool default: false

.SH RESOURCES AND DOCUMENTATION

See the website for documentation http://iojs.org/

Mailing list: http://groups.google.com/group/nodejs

IRC: irc.freenode.net #io.js