1// Copyright 2012 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5// This file defines all of the flags. It is separated into different section, 6// for Debug, Release, Logging and Profiling, etc. To add a new flag, find the 7// correct section, and use one of the DEFINE_ macros, without a trailing ';'. 8// 9// This include does not have a guard, because it is a template-style include, 10// which can be included multiple times in different modes. It expects to have 11// a mode defined before it's included. The modes are FLAG_MODE_... below: 12 13#define DEFINE_IMPLICATION(whenflag, thenflag) \ 14 DEFINE_VALUE_IMPLICATION(whenflag, thenflag, true) 15 16#define DEFINE_NEG_IMPLICATION(whenflag, thenflag) \ 17 DEFINE_VALUE_IMPLICATION(whenflag, thenflag, false) 18 19// We want to declare the names of the variables for the header file. Normally 20// this will just be an extern declaration, but for a readonly flag we let the 21// compiler make better optimizations by giving it the value. 22#if defined(FLAG_MODE_DECLARE) 23#define FLAG_FULL(ftype, ctype, nam, def, cmt) extern ctype FLAG_##nam; 24#define FLAG_READONLY(ftype, ctype, nam, def, cmt) \ 25 static ctype const FLAG_##nam = def; 26 27// We want to supply the actual storage and value for the flag variable in the 28// .cc file. We only do this for writable flags. 29#elif defined(FLAG_MODE_DEFINE) 30#define FLAG_FULL(ftype, ctype, nam, def, cmt) ctype FLAG_##nam = def; 31 32// We need to define all of our default values so that the Flag structure can 33// access them by pointer. These are just used internally inside of one .cc, 34// for MODE_META, so there is no impact on the flags interface. 35#elif defined(FLAG_MODE_DEFINE_DEFAULTS) 36#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 37 static ctype const FLAGDEFAULT_##nam = def; 38 39// We want to write entries into our meta data table, for internal parsing and 40// printing / etc in the flag parser code. We only do this for writable flags. 41#elif defined(FLAG_MODE_META) 42#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 43 { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false } \ 44 , 45#define FLAG_ALIAS(ftype, ctype, alias, nam) \ 46 { \ 47 Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \ 48 "alias for --" #nam, false \ 49 } \ 50 , 51 52// We produce the code to set flags when it is implied by another flag. 53#elif defined(FLAG_MODE_DEFINE_IMPLICATIONS) 54#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) \ 55 if (FLAG_##whenflag) FLAG_##thenflag = value; 56 57#else 58#error No mode supplied when including flags.defs 59#endif 60 61// Dummy defines for modes where it is not relevant. 62#ifndef FLAG_FULL 63#define FLAG_FULL(ftype, ctype, nam, def, cmt) 64#endif 65 66#ifndef FLAG_READONLY 67#define FLAG_READONLY(ftype, ctype, nam, def, cmt) 68#endif 69 70#ifndef FLAG_ALIAS 71#define FLAG_ALIAS(ftype, ctype, alias, nam) 72#endif 73 74#ifndef DEFINE_VALUE_IMPLICATION 75#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) 76#endif 77 78#define COMMA , 79 80#ifdef FLAG_MODE_DECLARE 81// Structure used to hold a collection of arguments to the JavaScript code. 82struct JSArguments { 83 public: 84 inline const char*& operator[](int idx) const { return argv[idx]; } 85 static JSArguments Create(int argc, const char** argv) { 86 JSArguments args; 87 args.argc = argc; 88 args.argv = argv; 89 return args; 90 } 91 int argc; 92 const char** argv; 93}; 94 95struct MaybeBoolFlag { 96 static MaybeBoolFlag Create(bool has_value, bool value) { 97 MaybeBoolFlag flag; 98 flag.has_value = has_value; 99 flag.value = value; 100 return flag; 101 } 102 bool has_value; 103 bool value; 104}; 105#endif 106 107#if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE) 108#define ENABLE_VFP3_DEFAULT true 109#else 110#define ENABLE_VFP3_DEFAULT false 111#endif 112#if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE) 113#define ENABLE_ARMV7_DEFAULT true 114#else 115#define ENABLE_ARMV7_DEFAULT false 116#endif 117#if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST_NO_FEATURE_PROBE) 118#define ENABLE_32DREGS_DEFAULT true 119#else 120#define ENABLE_32DREGS_DEFAULT false 121#endif 122#if (defined CAN_USE_NEON) || !(defined ARM_TEST_NO_FEATURE_PROBE) 123# define ENABLE_NEON_DEFAULT true 124#else 125# define ENABLE_NEON_DEFAULT false 126#endif 127 128#define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt) 129#define DEFINE_MAYBE_BOOL(nam, cmt) \ 130 FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, {false COMMA false}, cmt) 131#define DEFINE_INT(nam, def, cmt) FLAG(INT, int, nam, def, cmt) 132#define DEFINE_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) 133#define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) 134#define DEFINE_ARGS(nam, cmt) FLAG(ARGS, JSArguments, nam, {0 COMMA NULL}, cmt) 135 136#define DEFINE_ALIAS_BOOL(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam) 137#define DEFINE_ALIAS_INT(alias, nam) FLAG_ALIAS(INT, int, alias, nam) 138#define DEFINE_ALIAS_FLOAT(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam) 139#define DEFINE_ALIAS_STRING(alias, nam) \ 140 FLAG_ALIAS(STRING, const char*, alias, nam) 141#define DEFINE_ALIAS_ARGS(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam) 142 143// 144// Flags in all modes. 145// 146#define FLAG FLAG_FULL 147 148// Flags for language modes and experimental language features. 149DEFINE_BOOL(use_strict, false, "enforce strict mode") 150DEFINE_BOOL(es_staging, false, "enable upcoming ES6+ features") 151 152DEFINE_BOOL(harmony_scoping, false, "enable harmony block scoping") 153DEFINE_BOOL(harmony_modules, false, 154 "enable harmony modules (implies block scoping)") 155DEFINE_BOOL(harmony_proxies, false, "enable harmony proxies") 156DEFINE_BOOL(harmony_numeric_literals, false, 157 "enable harmony numeric literals (0o77, 0b11)") 158DEFINE_BOOL(harmony_strings, false, "enable harmony string") 159DEFINE_BOOL(harmony_arrays, false, "enable harmony arrays") 160DEFINE_BOOL(harmony_arrow_functions, false, "enable harmony arrow functions") 161DEFINE_BOOL(harmony_classes, false, "enable harmony classes") 162DEFINE_BOOL(harmony_object_literals, false, 163 "enable harmony object literal extensions") 164DEFINE_BOOL(harmony_regexps, false, "enable regexp-related harmony features") 165DEFINE_BOOL(harmony, false, "enable all harmony features (except proxies)") 166 167DEFINE_IMPLICATION(harmony, harmony_scoping) 168DEFINE_IMPLICATION(harmony, harmony_modules) 169// TODO(rossberg): Reenable when problems are sorted out. 170// DEFINE_IMPLICATION(harmony, harmony_proxies) 171DEFINE_IMPLICATION(harmony, harmony_numeric_literals) 172DEFINE_IMPLICATION(harmony, harmony_strings) 173DEFINE_IMPLICATION(harmony, harmony_arrays) 174DEFINE_IMPLICATION(harmony, harmony_arrow_functions) 175DEFINE_IMPLICATION(harmony, harmony_classes) 176DEFINE_IMPLICATION(harmony, harmony_object_literals) 177DEFINE_IMPLICATION(harmony, harmony_regexps) 178DEFINE_IMPLICATION(harmony_modules, harmony_scoping) 179DEFINE_IMPLICATION(harmony_classes, harmony_scoping) 180DEFINE_IMPLICATION(harmony_classes, harmony_object_literals) 181 182DEFINE_IMPLICATION(harmony, es_staging) 183 184// Flags for experimental implementation features. 185DEFINE_BOOL(compiled_keyed_generic_loads, false, 186 "use optimizing compiler to generate keyed generic load stubs") 187DEFINE_BOOL(clever_optimizations, true, 188 "Optimize object size, Array shift, DOM strings and string +") 189// TODO(hpayer): We will remove this flag as soon as we have pretenuring 190// support for specific allocation sites. 191DEFINE_BOOL(pretenuring_call_new, false, "pretenure call new") 192DEFINE_BOOL(allocation_site_pretenuring, true, 193 "pretenure with allocation sites") 194DEFINE_BOOL(trace_pretenuring, false, 195 "trace pretenuring decisions of HAllocate instructions") 196DEFINE_BOOL(trace_pretenuring_statistics, false, 197 "trace allocation site pretenuring statistics") 198DEFINE_BOOL(track_fields, true, "track fields with only smi values") 199DEFINE_BOOL(track_double_fields, true, "track fields with double values") 200DEFINE_BOOL(track_heap_object_fields, true, "track fields with heap values") 201DEFINE_BOOL(track_computed_fields, true, "track computed boilerplate fields") 202DEFINE_IMPLICATION(track_double_fields, track_fields) 203DEFINE_IMPLICATION(track_heap_object_fields, track_fields) 204DEFINE_IMPLICATION(track_computed_fields, track_fields) 205DEFINE_BOOL(track_field_types, true, "track field types") 206DEFINE_IMPLICATION(track_field_types, track_fields) 207DEFINE_IMPLICATION(track_field_types, track_heap_object_fields) 208DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations") 209DEFINE_BOOL(vector_ics, false, "support vector-based ics") 210 211// Flags for optimization types. 212DEFINE_BOOL(optimize_for_size, false, 213 "Enables optimizations which favor memory size over execution " 214 "speed.") 215 216DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1) 217 218// Flags for data representation optimizations 219DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles") 220DEFINE_BOOL(string_slices, true, "use string slices") 221 222// Flags for Crankshaft. 223DEFINE_BOOL(crankshaft, true, "use crankshaft") 224DEFINE_STRING(hydrogen_filter, "*", "optimization filter") 225DEFINE_BOOL(use_gvn, true, "use hydrogen global value numbering") 226DEFINE_INT(gvn_iterations, 3, "maximum number of GVN fix-point iterations") 227DEFINE_BOOL(use_canonicalizing, true, "use hydrogen instruction canonicalizing") 228DEFINE_BOOL(use_inlining, true, "use function inlining") 229DEFINE_BOOL(use_escape_analysis, true, "use hydrogen escape analysis") 230DEFINE_BOOL(use_allocation_folding, true, "use allocation folding") 231DEFINE_BOOL(use_local_allocation_folding, false, "only fold in basic blocks") 232DEFINE_BOOL(use_write_barrier_elimination, true, 233 "eliminate write barriers targeting allocations in optimized code") 234DEFINE_INT(max_inlining_levels, 5, "maximum number of inlining levels") 235DEFINE_INT(max_inlined_source_size, 600, 236 "maximum source size in bytes considered for a single inlining") 237DEFINE_INT(max_inlined_nodes, 196, 238 "maximum number of AST nodes considered for a single inlining") 239DEFINE_INT(max_inlined_nodes_cumulative, 400, 240 "maximum cumulative number of AST nodes considered for inlining") 241DEFINE_BOOL(loop_invariant_code_motion, true, "loop invariant code motion") 242DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions") 243DEFINE_BOOL(collect_megamorphic_maps_from_stub_cache, true, 244 "crankshaft harvests type feedback from stub cache") 245DEFINE_BOOL(hydrogen_stats, false, "print statistics for hydrogen") 246DEFINE_BOOL(trace_check_elimination, false, "trace check elimination phase") 247DEFINE_BOOL(trace_hydrogen, false, "trace generated hydrogen to file") 248DEFINE_STRING(trace_hydrogen_filter, "*", "hydrogen tracing filter") 249DEFINE_BOOL(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs") 250DEFINE_STRING(trace_hydrogen_file, NULL, "trace hydrogen to given file name") 251DEFINE_STRING(trace_phase, "HLZ", "trace generated IR for specified phases") 252DEFINE_BOOL(trace_inlining, false, "trace inlining decisions") 253DEFINE_BOOL(trace_load_elimination, false, "trace load elimination") 254DEFINE_BOOL(trace_store_elimination, false, "trace store elimination") 255DEFINE_BOOL(trace_alloc, false, "trace register allocator") 256DEFINE_BOOL(trace_all_uses, false, "trace all use positions") 257DEFINE_BOOL(trace_range, false, "trace range analysis") 258DEFINE_BOOL(trace_gvn, false, "trace global value numbering") 259DEFINE_BOOL(trace_representation, false, "trace representation types") 260DEFINE_BOOL(trace_removable_simulates, false, "trace removable simulates") 261DEFINE_BOOL(trace_escape_analysis, false, "trace hydrogen escape analysis") 262DEFINE_BOOL(trace_allocation_folding, false, "trace allocation folding") 263DEFINE_BOOL(trace_track_allocation_sites, false, 264 "trace the tracking of allocation sites") 265DEFINE_BOOL(trace_migration, false, "trace object migration") 266DEFINE_BOOL(trace_generalization, false, "trace map generalization") 267DEFINE_BOOL(stress_pointer_maps, false, "pointer map for every instruction") 268DEFINE_BOOL(stress_environments, false, "environment for every instruction") 269DEFINE_INT(deopt_every_n_times, 0, 270 "deoptimize every n times a deopt point is passed") 271DEFINE_INT(deopt_every_n_garbage_collections, 0, 272 "deoptimize every n garbage collections") 273DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points") 274DEFINE_BOOL(trap_on_deopt, false, "put a break point before deoptimizing") 275DEFINE_BOOL(trap_on_stub_deopt, false, 276 "put a break point before deoptimizing a stub") 277DEFINE_BOOL(deoptimize_uncommon_cases, true, "deoptimize uncommon cases") 278DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining") 279DEFINE_BOOL(use_osr, true, "use on-stack replacement") 280DEFINE_BOOL(array_bounds_checks_elimination, true, 281 "perform array bounds checks elimination") 282DEFINE_BOOL(trace_bce, false, "trace array bounds check elimination") 283DEFINE_BOOL(array_bounds_checks_hoisting, false, 284 "perform array bounds checks hoisting") 285DEFINE_BOOL(array_index_dehoisting, true, "perform array index dehoisting") 286DEFINE_BOOL(analyze_environment_liveness, true, 287 "analyze liveness of environment slots and zap dead values") 288DEFINE_BOOL(load_elimination, true, "use load elimination") 289DEFINE_BOOL(check_elimination, true, "use check elimination") 290DEFINE_BOOL(store_elimination, false, "use store elimination") 291DEFINE_BOOL(dead_code_elimination, true, "use dead code elimination") 292DEFINE_BOOL(fold_constants, true, "use constant folding") 293DEFINE_BOOL(trace_dead_code_elimination, false, "trace dead code elimination") 294DEFINE_BOOL(unreachable_code_elimination, true, "eliminate unreachable code") 295DEFINE_BOOL(trace_osr, false, "trace on-stack replacement") 296DEFINE_INT(stress_runs, 0, "number of stress runs") 297DEFINE_BOOL(lookup_sample_by_shared, true, 298 "when picking a function to optimize, watch for shared function " 299 "info, not JSFunction itself") 300DEFINE_BOOL(cache_optimized_code, true, "cache optimized code for closures") 301DEFINE_BOOL(flush_optimized_code_cache, true, 302 "flushes the cache of optimized code for closures on every GC") 303DEFINE_BOOL(inline_construct, true, "inline constructor calls") 304DEFINE_BOOL(inline_arguments, true, "inline functions with arguments object") 305DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors") 306DEFINE_INT(escape_analysis_iterations, 2, 307 "maximum number of escape analysis fix-point iterations") 308 309DEFINE_BOOL(optimize_for_in, true, "optimize functions containing for-in loops") 310DEFINE_BOOL(opt_safe_uint32_operations, true, 311 "allow uint32 values on optimize frames if they are used only in " 312 "safe operations") 313 314DEFINE_BOOL(concurrent_recompilation, true, 315 "optimizing hot functions asynchronously on a separate thread") 316DEFINE_BOOL(trace_concurrent_recompilation, false, 317 "track concurrent recompilation") 318DEFINE_INT(concurrent_recompilation_queue_length, 8, 319 "the length of the concurrent compilation queue") 320DEFINE_INT(concurrent_recompilation_delay, 0, 321 "artificial compilation delay in ms") 322DEFINE_BOOL(block_concurrent_recompilation, false, 323 "block queued jobs until released") 324DEFINE_BOOL(concurrent_osr, true, "concurrent on-stack replacement") 325DEFINE_IMPLICATION(concurrent_osr, concurrent_recompilation) 326 327DEFINE_BOOL(omit_map_checks_for_leaf_maps, true, 328 "do not emit check maps for constant values that have a leaf map, " 329 "deoptimize the optimized code if the layout of the maps changes.") 330 331// Flags for TurboFan. 332DEFINE_STRING(turbo_filter, "~", "optimization filter for TurboFan compiler") 333DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR") 334DEFINE_BOOL(trace_turbo_types, true, "trace generated TurboFan types") 335DEFINE_BOOL(trace_turbo_scheduler, false, "trace generated TurboFan scheduler") 336DEFINE_BOOL(turbo_asm, false, "enable TurboFan for asm.js code") 337DEFINE_BOOL(turbo_verify, false, "verify TurboFan graphs at each phase") 338DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics") 339#if V8_TURBOFAN_BACKEND 340DEFINE_BOOL(turbo_types, true, "use typed lowering in TurboFan") 341#else 342DEFINE_BOOL(turbo_types, false, "use typed lowering in TurboFan") 343#endif 344DEFINE_BOOL(turbo_source_positions, false, 345 "track source code positions when building TurboFan IR") 346DEFINE_BOOL(context_specialization, false, 347 "enable context specialization in TurboFan") 348DEFINE_BOOL(turbo_deoptimization, false, "enable deoptimization in TurboFan") 349DEFINE_BOOL(turbo_inlining, false, "enable inlining in TurboFan") 350DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining") 351DEFINE_IMPLICATION(turbo_inlining, turbo_types) 352 353DEFINE_INT(typed_array_max_size_in_heap, 64, 354 "threshold for in-heap typed array") 355 356// Profiler flags. 357DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler") 358// 0x1800 fits in the immediate field of an ARM instruction. 359DEFINE_INT(interrupt_budget, 0x1800, 360 "execution budget before interrupt is triggered") 361DEFINE_INT(type_info_threshold, 25, 362 "percentage of ICs that must have type info to allow optimization") 363DEFINE_INT(generic_ic_threshold, 30, 364 "max percentage of megamorphic/generic ICs to allow optimization") 365DEFINE_INT(self_opt_count, 130, "call count before self-optimization") 366 367DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing") 368DEFINE_IMPLICATION(trace_opt_verbose, trace_opt) 369 370// assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc 371DEFINE_BOOL(debug_code, false, "generate extra code (assertions) for debugging") 372DEFINE_BOOL(code_comments, false, "emit comments in code disassembly") 373DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 instructions if available") 374DEFINE_BOOL(enable_sse4_1, true, 375 "enable use of SSE4.1 instructions if available") 376DEFINE_BOOL(enable_sahf, true, 377 "enable use of SAHF instruction if available (X64 only)") 378DEFINE_BOOL(enable_vfp3, ENABLE_VFP3_DEFAULT, 379 "enable use of VFP3 instructions if available") 380DEFINE_BOOL(enable_armv7, ENABLE_ARMV7_DEFAULT, 381 "enable use of ARMv7 instructions if available (ARM only)") 382DEFINE_BOOL(enable_neon, ENABLE_NEON_DEFAULT, 383 "enable use of NEON instructions if available (ARM only)") 384DEFINE_BOOL(enable_sudiv, true, 385 "enable use of SDIV and UDIV instructions if available (ARM only)") 386DEFINE_BOOL(enable_mls, true, 387 "enable use of MLS instructions if available (ARM only)") 388DEFINE_BOOL(enable_movw_movt, false, 389 "enable loading 32-bit constant by means of movw/movt " 390 "instruction pairs (ARM only)") 391DEFINE_BOOL(enable_unaligned_accesses, true, 392 "enable unaligned accesses for ARMv7 (ARM only)") 393DEFINE_BOOL(enable_32dregs, ENABLE_32DREGS_DEFAULT, 394 "enable use of d16-d31 registers on ARM - this requires VFP3") 395DEFINE_BOOL(enable_vldr_imm, false, 396 "enable use of constant pools for double immediate (ARM only)") 397DEFINE_BOOL(force_long_branches, false, 398 "force all emitted branches to be in long mode (MIPS only)") 399 400// cpu-arm64.cc 401DEFINE_BOOL(enable_always_align_csp, true, 402 "enable alignment of csp to 16 bytes on platforms which prefer " 403 "the register to always be aligned (ARM64 only)") 404 405// bootstrapper.cc 406DEFINE_STRING(expose_natives_as, NULL, "expose natives in global object") 407DEFINE_STRING(expose_debug_as, NULL, "expose debug in global object") 408DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension") 409DEFINE_BOOL(expose_gc, false, "expose gc extension") 410DEFINE_STRING(expose_gc_as, NULL, 411 "expose gc extension under the specified name") 412DEFINE_IMPLICATION(expose_gc_as, expose_gc) 413DEFINE_BOOL(expose_externalize_string, false, 414 "expose externalize string extension") 415DEFINE_BOOL(expose_trigger_failure, false, "expose trigger-failure extension") 416DEFINE_INT(stack_trace_limit, 10, "number of stack frames to capture") 417DEFINE_BOOL(builtins_in_stack_traces, false, 418 "show built-in functions in stack traces") 419DEFINE_BOOL(disable_native_files, false, "disable builtin natives files") 420 421// builtins-ia32.cc 422DEFINE_BOOL(inline_new, true, "use fast inline allocation") 423 424// codegen-ia32.cc / codegen-arm.cc 425DEFINE_BOOL(trace_codegen, false, 426 "print name of functions for which code is generated") 427DEFINE_BOOL(trace, false, "trace function calls") 428DEFINE_BOOL(mask_constants_with_cookie, true, 429 "use random jit cookie to mask large constants") 430 431// codegen.cc 432DEFINE_BOOL(lazy, true, "use lazy compilation") 433DEFINE_BOOL(trace_opt, false, "trace lazy optimization") 434DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics") 435DEFINE_BOOL(opt, true, "use adaptive optimizations") 436DEFINE_BOOL(always_opt, false, "always try to optimize functions") 437DEFINE_BOOL(always_osr, false, "always try to OSR functions") 438DEFINE_BOOL(prepare_always_opt, false, "prepare for turning on always opt") 439DEFINE_BOOL(trace_deopt, false, "trace optimize function deoptimization") 440DEFINE_BOOL(trace_stub_failures, false, 441 "trace deoptimization of generated code stubs") 442 443DEFINE_BOOL(serialize_toplevel, false, "enable caching of toplevel scripts") 444DEFINE_BOOL(trace_code_serializer, false, "trace code serializer") 445 446// compiler.cc 447DEFINE_INT(min_preparse_length, 1024, 448 "minimum length for automatic enable preparsing") 449DEFINE_INT(max_opt_count, 10, 450 "maximum number of optimization attempts before giving up.") 451 452// compilation-cache.cc 453DEFINE_BOOL(compilation_cache, true, "enable compilation cache") 454 455DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions") 456 457// cpu-profiler.cc 458DEFINE_INT(cpu_profiler_sampling_interval, 1000, 459 "CPU profiler sampling interval in microseconds") 460 461// debug.cc 462DEFINE_BOOL(trace_debug_json, false, "trace debugging JSON request/response") 463DEFINE_BOOL(trace_js_array_abuse, false, 464 "trace out-of-bounds accesses to JS arrays") 465DEFINE_BOOL(trace_external_array_abuse, false, 466 "trace out-of-bounds-accesses to external arrays") 467DEFINE_BOOL(trace_array_abuse, false, 468 "trace out-of-bounds accesses to all arrays") 469DEFINE_IMPLICATION(trace_array_abuse, trace_js_array_abuse) 470DEFINE_IMPLICATION(trace_array_abuse, trace_external_array_abuse) 471DEFINE_BOOL(enable_liveedit, true, "enable liveedit experimental feature") 472DEFINE_BOOL(hard_abort, true, "abort by crashing") 473 474// execution.cc 475DEFINE_INT(stack_size, V8_DEFAULT_STACK_SIZE_KB, 476 "default size of stack region v8 is allowed to use (in kBytes)") 477 478// frames.cc 479DEFINE_INT(max_stack_trace_source_length, 300, 480 "maximum length of function source code printed in a stack trace.") 481 482// full-codegen.cc 483DEFINE_BOOL(always_inline_smi_code, false, 484 "always inline smi code in non-opt code") 485 486// heap.cc 487DEFINE_INT(min_semi_space_size, 0, 488 "min size of a semi-space (in MBytes), the new space consists of two" 489 "semi-spaces") 490DEFINE_INT(max_semi_space_size, 0, 491 "max size of a semi-space (in MBytes), the new space consists of two" 492 "semi-spaces") 493DEFINE_INT(max_old_space_size, 0, "max size of the old space (in Mbytes)") 494DEFINE_INT(max_executable_size, 0, "max size of executable memory (in Mbytes)") 495DEFINE_BOOL(gc_global, false, "always perform global GCs") 496DEFINE_INT(gc_interval, -1, "garbage collect after <n> allocations") 497DEFINE_BOOL(trace_gc, false, 498 "print one trace line following each garbage collection") 499DEFINE_BOOL(trace_gc_nvp, false, 500 "print one detailed trace line in name=value format " 501 "after each garbage collection") 502DEFINE_BOOL(trace_gc_ignore_scavenger, false, 503 "do not print trace line after scavenger collection") 504DEFINE_BOOL(trace_idle_notification, false, 505 "print one trace line following each idle notification") 506DEFINE_BOOL(print_cumulative_gc_stat, false, 507 "print cumulative GC statistics in name=value format on exit") 508DEFINE_BOOL(print_max_heap_committed, false, 509 "print statistics of the maximum memory committed for the heap " 510 "in name=value format on exit") 511DEFINE_BOOL(trace_gc_verbose, false, 512 "print more details following each garbage collection") 513DEFINE_BOOL(trace_fragmentation, false, 514 "report fragmentation for old pointer and data pages") 515DEFINE_BOOL(collect_maps, true, 516 "garbage collect maps from which no objects can be reached") 517DEFINE_BOOL(weak_embedded_maps_in_ic, true, 518 "make maps embedded in inline cache stubs") 519DEFINE_BOOL(weak_embedded_maps_in_optimized_code, true, 520 "make maps embedded in optimized code weak") 521DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true, 522 "make objects embedded in optimized code weak") 523DEFINE_BOOL(flush_code, true, 524 "flush code that we expect not to use again (during full gc)") 525DEFINE_BOOL(flush_code_incrementally, true, 526 "flush code that we expect not to use again (incrementally)") 527DEFINE_BOOL(trace_code_flushing, false, "trace code flushing progress") 528DEFINE_BOOL(age_code, true, 529 "track un-executed functions to age code and flush only " 530 "old code (required for code flushing)") 531DEFINE_BOOL(incremental_marking, true, "use incremental marking") 532DEFINE_BOOL(incremental_marking_steps, true, "do incremental marking steps") 533DEFINE_BOOL(trace_incremental_marking, false, 534 "trace progress of the incremental marking") 535DEFINE_BOOL(track_gc_object_stats, false, 536 "track object counts and memory usage") 537DEFINE_BOOL(parallel_sweeping, false, "enable parallel sweeping") 538DEFINE_BOOL(concurrent_sweeping, true, "enable concurrent sweeping") 539DEFINE_INT(sweeper_threads, 0, 540 "number of parallel and concurrent sweeping threads") 541DEFINE_BOOL(job_based_sweeping, true, "enable job based sweeping") 542#ifdef VERIFY_HEAP 543DEFINE_BOOL(verify_heap, false, "verify heap pointers before and after GC") 544#endif 545 546 547// heap-snapshot-generator.cc 548DEFINE_BOOL(heap_profiler_trace_objects, false, 549 "Dump heap object allocations/movements/size_updates") 550 551 552// v8.cc 553DEFINE_BOOL(use_idle_notification, true, 554 "Use idle notification to reduce memory footprint.") 555// ic.cc 556DEFINE_BOOL(use_ic, true, "use inline caching") 557DEFINE_BOOL(trace_ic, false, "trace inline cache state transitions") 558 559// macro-assembler-ia32.cc 560DEFINE_BOOL(native_code_counters, false, 561 "generate extra code for manipulating stats counters") 562 563// mark-compact.cc 564DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC") 565DEFINE_BOOL(never_compact, false, 566 "Never perform compaction on full GC - testing only") 567DEFINE_BOOL(compact_code_space, true, 568 "Compact code space on full non-incremental collections") 569DEFINE_BOOL(incremental_code_compaction, true, 570 "Compact code space on full incremental collections") 571DEFINE_BOOL(cleanup_code_caches_at_gc, true, 572 "Flush inline caches prior to mark compact collection and " 573 "flush code caches in maps during mark compact cycle.") 574DEFINE_BOOL(use_marking_progress_bar, true, 575 "Use a progress bar to scan large objects in increments when " 576 "incremental marking is active.") 577DEFINE_BOOL(zap_code_space, true, 578 "Zap free memory in code space with 0xCC while sweeping.") 579DEFINE_INT(random_seed, 0, 580 "Default seed for initializing random generator " 581 "(0, the default, means to use system random).") 582 583// objects.cc 584DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing") 585 586// parser.cc 587DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax") 588DEFINE_BOOL(trace_parse, false, "trace parsing and preparsing") 589 590// simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc 591DEFINE_BOOL(trace_sim, false, "Trace simulator execution") 592DEFINE_BOOL(debug_sim, false, "Enable debugging the simulator") 593DEFINE_BOOL(check_icache, false, 594 "Check icache flushes in ARM and MIPS simulator") 595DEFINE_INT(stop_sim_at, 0, "Simulator stop after x number of instructions") 596#if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) 597DEFINE_INT(sim_stack_alignment, 16, 598 "Stack alignment in bytes in simulator. This must be a power of two " 599 "and it must be at least 16. 16 is default.") 600#else 601DEFINE_INT(sim_stack_alignment, 8, 602 "Stack alingment in bytes in simulator (4 or 8, 8 is default)") 603#endif 604DEFINE_INT(sim_stack_size, 2 * MB / KB, 605 "Stack size of the ARM64 and MIPS64 simulator " 606 "in kBytes (default is 2 MB)") 607DEFINE_BOOL(log_regs_modified, true, 608 "When logging register values, only print modified registers.") 609DEFINE_BOOL(log_colour, true, "When logging, try to use coloured output.") 610DEFINE_BOOL(ignore_asm_unimplemented_break, false, 611 "Don't break for ASM_UNIMPLEMENTED_BREAK macros.") 612DEFINE_BOOL(trace_sim_messages, false, 613 "Trace simulator debug messages. Implied by --trace-sim.") 614 615// isolate.cc 616DEFINE_BOOL(stack_trace_on_illegal, false, 617 "print stack trace when an illegal exception is thrown") 618DEFINE_BOOL(abort_on_uncaught_exception, false, 619 "abort program (dump core) when an uncaught exception is thrown") 620DEFINE_BOOL(randomize_hashes, true, 621 "randomize hashes to avoid predictable hash collisions " 622 "(with snapshots this option cannot override the baked-in seed)") 623DEFINE_INT(hash_seed, 0, 624 "Fixed seed to use to hash property keys (0 means random)" 625 "(with snapshots this option cannot override the baked-in seed)") 626 627// snapshot-common.cc 628DEFINE_BOOL(profile_deserialization, false, 629 "Print the time it takes to deserialize the snapshot.") 630 631// Regexp 632DEFINE_BOOL(regexp_optimization, true, "generate optimized regexp code") 633 634// Testing flags test/cctest/test-{flags,api,serialization}.cc 635DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag") 636DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag") 637DEFINE_INT(testing_int_flag, 13, "testing_int_flag") 638DEFINE_FLOAT(testing_float_flag, 2.5, "float-flag") 639DEFINE_STRING(testing_string_flag, "Hello, world!", "string-flag") 640DEFINE_INT(testing_prng_seed, 42, "Seed used for threading test randomness") 641#ifdef _WIN32 642DEFINE_STRING(testing_serialization_file, "C:\\Windows\\Temp\\serdes", 643 "file in which to testing_serialize heap") 644#else 645DEFINE_STRING(testing_serialization_file, "/tmp/serdes", 646 "file in which to serialize heap") 647#endif 648 649// mksnapshot.cc 650DEFINE_STRING(extra_code, NULL, 651 "A filename with extra code to be included in" 652 " the snapshot (mksnapshot only)") 653DEFINE_STRING(raw_file, NULL, 654 "A file to write the raw snapshot bytes to. " 655 "(mksnapshot only)") 656DEFINE_STRING(raw_context_file, NULL, 657 "A file to write the raw context " 658 "snapshot bytes to. (mksnapshot only)") 659DEFINE_STRING(startup_blob, NULL, 660 "Write V8 startup blob file. " 661 "(mksnapshot only)") 662 663// code-stubs-hydrogen.cc 664DEFINE_BOOL(profile_hydrogen_code_stub_compilation, false, 665 "Print the time it takes to lazily compile hydrogen code stubs.") 666 667DEFINE_BOOL(predictable, false, "enable predictable mode") 668DEFINE_NEG_IMPLICATION(predictable, concurrent_recompilation) 669DEFINE_NEG_IMPLICATION(predictable, concurrent_osr) 670DEFINE_NEG_IMPLICATION(predictable, concurrent_sweeping) 671DEFINE_NEG_IMPLICATION(predictable, parallel_sweeping) 672 673 674// 675// Dev shell flags 676// 677 678DEFINE_BOOL(help, false, "Print usage message, including flags, on console") 679DEFINE_BOOL(dump_counters, false, "Dump counters on exit") 680 681DEFINE_BOOL(debugger, false, "Enable JavaScript debugger") 682 683DEFINE_STRING(map_counters, "", "Map counters to a file") 684DEFINE_ARGS(js_arguments, 685 "Pass all remaining arguments to the script. Alias for \"--\".") 686 687// 688// GDB JIT integration flags. 689// 690 691DEFINE_BOOL(gdbjit, false, "enable GDBJIT interface (disables compacting GC)") 692DEFINE_BOOL(gdbjit_full, false, "enable GDBJIT interface for all code objects") 693DEFINE_BOOL(gdbjit_dump, false, "dump elf objects with debug info to disk") 694DEFINE_STRING(gdbjit_dump_filter, "", 695 "dump only objects containing this substring") 696 697// mark-compact.cc 698DEFINE_BOOL(force_marking_deque_overflows, false, 699 "force overflows of marking deque by reducing it's size " 700 "to 64 words") 701 702DEFINE_BOOL(stress_compaction, false, 703 "stress the GC compactor to flush out bugs (implies " 704 "--force_marking_deque_overflows)") 705 706// 707// Debug only flags 708// 709#undef FLAG 710#ifdef DEBUG 711#define FLAG FLAG_FULL 712#else 713#define FLAG FLAG_READONLY 714#endif 715 716// checks.cc 717#ifdef ENABLE_SLOW_DCHECKS 718DEFINE_BOOL(enable_slow_asserts, false, 719 "enable asserts that are slow to execute") 720#endif 721 722// codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc 723DEFINE_BOOL(print_source, false, "pretty print source code") 724DEFINE_BOOL(print_builtin_source, false, 725 "pretty print source code for builtins") 726DEFINE_BOOL(print_ast, false, "print source AST") 727DEFINE_BOOL(print_builtin_ast, false, "print source AST for builtins") 728DEFINE_STRING(stop_at, "", "function name where to insert a breakpoint") 729DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints") 730 731// compiler.cc 732DEFINE_BOOL(print_builtin_scopes, false, "print scopes for builtins") 733DEFINE_BOOL(print_scopes, false, "print scopes") 734 735// contexts.cc 736DEFINE_BOOL(trace_contexts, false, "trace contexts operations") 737 738// heap.cc 739DEFINE_BOOL(gc_verbose, false, "print stuff during garbage collection") 740DEFINE_BOOL(heap_stats, false, "report heap statistics before and after GC") 741DEFINE_BOOL(code_stats, false, "report code statistics after GC") 742DEFINE_BOOL(verify_native_context_separation, false, 743 "verify that code holds on to at most one native context after GC") 744DEFINE_BOOL(print_handles, false, "report handles after GC") 745DEFINE_BOOL(print_global_handles, false, "report global handles after GC") 746 747// TurboFan debug-only flags. 748DEFINE_BOOL(print_turbo_replay, false, 749 "print C++ code to recreate TurboFan graphs") 750 751// interface.cc 752DEFINE_BOOL(print_interfaces, false, "print interfaces") 753DEFINE_BOOL(print_interface_details, false, "print interface inference details") 754DEFINE_INT(print_interface_depth, 5, "depth for printing interfaces") 755 756// objects.cc 757DEFINE_BOOL(trace_normalization, false, 758 "prints when objects are turned into dictionaries.") 759 760// runtime.cc 761DEFINE_BOOL(trace_lazy, false, "trace lazy compilation") 762 763// spaces.cc 764DEFINE_BOOL(collect_heap_spill_statistics, false, 765 "report heap spill statistics along with heap_stats " 766 "(requires heap_stats)") 767 768DEFINE_BOOL(trace_isolates, false, "trace isolate state changes") 769 770// Regexp 771DEFINE_BOOL(regexp_possessive_quantifier, false, 772 "enable possessive quantifier syntax for testing") 773DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution") 774DEFINE_BOOL(trace_regexp_assembler, false, 775 "trace regexp macro assembler calls.") 776 777// 778// Logging and profiling flags 779// 780#undef FLAG 781#define FLAG FLAG_FULL 782 783// log.cc 784DEFINE_BOOL(log, false, 785 "Minimal logging (no API, code, GC, suspect, or handles samples).") 786DEFINE_BOOL(log_all, false, "Log all events to the log file.") 787DEFINE_BOOL(log_api, false, "Log API events to the log file.") 788DEFINE_BOOL(log_code, false, 789 "Log code events to the log file without profiling.") 790DEFINE_BOOL(log_gc, false, 791 "Log heap samples on garbage collection for the hp2ps tool.") 792DEFINE_BOOL(log_handles, false, "Log global handle events.") 793DEFINE_BOOL(log_snapshot_positions, false, 794 "log positions of (de)serialized objects in the snapshot.") 795DEFINE_BOOL(log_suspect, false, "Log suspect operations.") 796DEFINE_BOOL(prof, false, 797 "Log statistical profiling information (implies --log-code).") 798DEFINE_BOOL(prof_browser_mode, true, 799 "Used with --prof, turns on browser-compatible mode for profiling.") 800DEFINE_BOOL(log_regexp, false, "Log regular expression execution.") 801DEFINE_STRING(logfile, "v8.log", "Specify the name of the log file.") 802DEFINE_BOOL(logfile_per_isolate, true, "Separate log files for each isolate.") 803DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.") 804DEFINE_BOOL(perf_basic_prof, false, 805 "Enable perf linux profiler (basic support).") 806DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space) 807DEFINE_BOOL(perf_jit_prof, false, 808 "Enable perf linux profiler (experimental annotate support).") 809DEFINE_NEG_IMPLICATION(perf_jit_prof, compact_code_space) 810DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__", 811 "Specify the name of the file for fake gc mmap used in ll_prof") 812DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.") 813DEFINE_BOOL(log_timer_events, false, 814 "Time events including external callbacks.") 815DEFINE_IMPLICATION(log_timer_events, log_internal_timer_events) 816DEFINE_IMPLICATION(log_internal_timer_events, prof) 817DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.") 818DEFINE_STRING(log_instruction_file, "arm64_inst.csv", 819 "AArch64 instruction statistics log file.") 820DEFINE_INT(log_instruction_period, 1 << 22, 821 "AArch64 instruction statistics logging period.") 822 823DEFINE_BOOL(redirect_code_traces, false, 824 "output deopt information and disassembly into file " 825 "code-<pid>-<isolate id>.asm") 826DEFINE_STRING(redirect_code_traces_to, NULL, 827 "output deopt information and disassembly into the given file") 828 829DEFINE_BOOL(hydrogen_track_positions, false, 830 "track source code positions when building IR") 831 832// 833// Disassembler only flags 834// 835#undef FLAG 836#ifdef ENABLE_DISASSEMBLER 837#define FLAG FLAG_FULL 838#else 839#define FLAG FLAG_READONLY 840#endif 841 842// elements.cc 843DEFINE_BOOL(trace_elements_transitions, false, "trace elements transitions") 844 845DEFINE_BOOL(trace_creation_allocation_sites, false, 846 "trace the creation of allocation sites") 847 848// code-stubs.cc 849DEFINE_BOOL(print_code_stubs, false, "print code stubs") 850DEFINE_BOOL(test_secondary_stub_cache, false, 851 "test secondary stub cache by disabling the primary one") 852 853DEFINE_BOOL(test_primary_stub_cache, false, 854 "test primary stub cache by disabling the secondary one") 855 856 857// codegen-ia32.cc / codegen-arm.cc 858DEFINE_BOOL(print_code, false, "print generated code") 859DEFINE_BOOL(print_opt_code, false, "print optimized code") 860DEFINE_BOOL(print_unopt_code, false, 861 "print unoptimized code before " 862 "printing optimized code based on it") 863DEFINE_BOOL(print_code_verbose, false, "print more information for code") 864DEFINE_BOOL(print_builtin_code, false, "print generated code for builtins") 865 866#ifdef ENABLE_DISASSEMBLER 867DEFINE_BOOL(sodium, false, 868 "print generated code output suitable for use with " 869 "the Sodium code viewer") 870 871DEFINE_IMPLICATION(sodium, print_code_stubs) 872DEFINE_IMPLICATION(sodium, print_code) 873DEFINE_IMPLICATION(sodium, print_opt_code) 874DEFINE_IMPLICATION(sodium, hydrogen_track_positions) 875DEFINE_IMPLICATION(sodium, code_comments) 876 877DEFINE_BOOL(print_all_code, false, "enable all flags related to printing code") 878DEFINE_IMPLICATION(print_all_code, print_code) 879DEFINE_IMPLICATION(print_all_code, print_opt_code) 880DEFINE_IMPLICATION(print_all_code, print_unopt_code) 881DEFINE_IMPLICATION(print_all_code, print_code_verbose) 882DEFINE_IMPLICATION(print_all_code, print_builtin_code) 883DEFINE_IMPLICATION(print_all_code, print_code_stubs) 884DEFINE_IMPLICATION(print_all_code, code_comments) 885#ifdef DEBUG 886DEFINE_IMPLICATION(print_all_code, trace_codegen) 887#endif 888#endif 889 890 891// 892// VERIFY_PREDICTABLE related flags 893// 894#undef FLAG 895 896#ifdef VERIFY_PREDICTABLE 897#define FLAG FLAG_FULL 898#else 899#define FLAG FLAG_READONLY 900#endif 901 902DEFINE_BOOL(verify_predictable, false, 903 "this mode is used for checking that V8 behaves predictably") 904DEFINE_INT(dump_allocations_digest_at_alloc, 0, 905 "dump allocations digest each n-th allocation") 906 907 908// 909// Read-only flags 910// 911#undef FLAG 912#define FLAG FLAG_READONLY 913 914// assembler-arm.h 915DEFINE_BOOL(enable_ool_constant_pool, V8_OOL_CONSTANT_POOL, 916 "enable use of out-of-line constant pools (ARM only)") 917 918// Cleanup... 919#undef FLAG_FULL 920#undef FLAG_READONLY 921#undef FLAG 922#undef FLAG_ALIAS 923 924#undef DEFINE_BOOL 925#undef DEFINE_MAYBE_BOOL 926#undef DEFINE_INT 927#undef DEFINE_STRING 928#undef DEFINE_FLOAT 929#undef DEFINE_ARGS 930#undef DEFINE_IMPLICATION 931#undef DEFINE_NEG_IMPLICATION 932#undef DEFINE_VALUE_IMPLICATION 933#undef DEFINE_ALIAS_BOOL 934#undef DEFINE_ALIAS_INT 935#undef DEFINE_ALIAS_STRING 936#undef DEFINE_ALIAS_FLOAT 937#undef DEFINE_ALIAS_ARGS 938 939#undef FLAG_MODE_DECLARE 940#undef FLAG_MODE_DEFINE 941#undef FLAG_MODE_DEFINE_DEFAULTS 942#undef FLAG_MODE_META 943#undef FLAG_MODE_DEFINE_IMPLICATIONS 944 945#undef COMMA 946