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 #define DEFINE_NEG_NEG_IMPLICATION(whenflag, thenflag) \ 20 DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, false) 21 22 // We want to declare the names of the variables for the header file. Normally 23 // this will just be an extern declaration, but for a readonly flag we let the 24 // compiler make better optimizations by giving it the value. 25 #if defined(FLAG_MODE_DECLARE) 26 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 27 V8_EXPORT_PRIVATE extern ctype FLAG_##nam; 28 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) \ 29 static ctype const FLAG_##nam = def; 30 31 // We want to supply the actual storage and value for the flag variable in the 32 // .cc file. We only do this for writable flags. 33 #elif defined(FLAG_MODE_DEFINE) 34 #ifdef USING_V8_SHARED 35 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 36 V8_EXPORT_PRIVATE extern ctype FLAG_##nam; 37 #else 38 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 39 V8_EXPORT_PRIVATE ctype FLAG_##nam = def; 40 #endif 41 42 // We need to define all of our default values so that the Flag structure can 43 // access them by pointer. These are just used internally inside of one .cc, 44 // for MODE_META, so there is no impact on the flags interface. 45 #elif defined(FLAG_MODE_DEFINE_DEFAULTS) 46 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 47 static ctype const FLAGDEFAULT_##nam = def; 48 49 // We want to write entries into our meta data table, for internal parsing and 50 // printing / etc in the flag parser code. We only do this for writable flags. 51 #elif defined(FLAG_MODE_META) 52 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 53 { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false } \ 54 , 55 #define FLAG_ALIAS(ftype, ctype, alias, nam) \ 56 { \ 57 Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \ 58 "alias for --" #nam, false \ 59 } \ 60 , 61 62 // We produce the code to set flags when it is implied by another flag. 63 #elif defined(FLAG_MODE_DEFINE_IMPLICATIONS) 64 #define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) \ 65 if (FLAG_##whenflag) FLAG_##thenflag = value; 66 67 #define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) \ 68 if (!FLAG_##whenflag) FLAG_##thenflag = value; 69 70 #else 71 #error No mode supplied when including flags.defs 72 #endif 73 74 // Dummy defines for modes where it is not relevant. 75 #ifndef FLAG_FULL 76 #define FLAG_FULL(ftype, ctype, nam, def, cmt) 77 #endif 78 79 #ifndef FLAG_READONLY 80 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 81 #endif 82 83 #ifndef FLAG_ALIAS 84 #define FLAG_ALIAS(ftype, ctype, alias, nam) 85 #endif 86 87 #ifndef DEFINE_VALUE_IMPLICATION 88 #define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) 89 #endif 90 91 #ifndef DEFINE_NEG_VALUE_IMPLICATION 92 #define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) 93 #endif 94 95 #define COMMA , 96 97 #ifdef FLAG_MODE_DECLARE 98 // Structure used to hold a collection of arguments to the JavaScript code. 99 struct JSArguments { 100 public: 101 inline const char*& operator[](int idx) const { return argv[idx]; } 102 static JSArguments Create(int argc, const char** argv) { 103 JSArguments args; 104 args.argc = argc; 105 args.argv = argv; 106 return args; 107 } 108 int argc; 109 const char** argv; 110 }; 111 112 struct MaybeBoolFlag { 113 static MaybeBoolFlag Create(bool has_value, bool value) { 114 MaybeBoolFlag flag; 115 flag.has_value = has_value; 116 flag.value = value; 117 return flag; 118 } 119 bool has_value; 120 bool value; 121 }; 122 #endif 123 124 #ifdef DEBUG 125 #define DEBUG_BOOL true 126 #else 127 #define DEBUG_BOOL false 128 #endif 129 130 // Supported ARM configurations are: 131 // "armv6": ARMv6 + VFPv2 132 // "armv7": ARMv7 + VFPv3-D32 + NEON 133 // "armv7+sudiv": ARMv7 + VFPv4-D32 + NEON + SUDIV 134 // "armv8": ARMv8 (including all of the above) 135 #if !defined(ARM_TEST_NO_FEATURE_PROBE) || \ 136 (defined(CAN_USE_ARMV8_INSTRUCTIONS) && \ 137 defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \ 138 defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS)) 139 #define ARM_ARCH_DEFAULT "armv8" 140 #elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \ 141 defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS) 142 #define ARM_ARCH_DEFAULT "armv7+sudiv" 143 #elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_NEON) && \ 144 defined(CAN_USE_VFP3_INSTRUCTIONS) 145 #define ARM_ARCH_DEFAULT "armv7" 146 #else 147 #define ARM_ARCH_DEFAULT "armv6" 148 #endif 149 150 #ifdef V8_OS_WIN 151 # define ENABLE_LOG_COLOUR false 152 #else 153 # define ENABLE_LOG_COLOUR true 154 #endif 155 156 #define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt) 157 #define DEFINE_BOOL_READONLY(nam, def, cmt) \ 158 FLAG_READONLY(BOOL, bool, nam, def, cmt) 159 #define DEFINE_MAYBE_BOOL(nam, cmt) \ 160 FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, {false COMMA false}, cmt) 161 #define DEFINE_INT(nam, def, cmt) FLAG(INT, int, nam, def, cmt) 162 #define DEFINE_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) 163 #define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) 164 #define DEFINE_ARGS(nam, cmt) FLAG(ARGS, JSArguments, nam, {0 COMMA NULL}, cmt) 165 166 #define DEFINE_ALIAS_BOOL(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam) 167 #define DEFINE_ALIAS_INT(alias, nam) FLAG_ALIAS(INT, int, alias, nam) 168 #define DEFINE_ALIAS_FLOAT(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam) 169 #define DEFINE_ALIAS_STRING(alias, nam) \ 170 FLAG_ALIAS(STRING, const char*, alias, nam) 171 #define DEFINE_ALIAS_ARGS(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam) 172 173 // 174 // Flags in all modes. 175 // 176 #define FLAG FLAG_FULL 177 178 DEFINE_BOOL(experimental_extras, false, 179 "enable code compiled in via v8_experimental_extra_library_files") 180 181 // Flags for language modes and experimental language features. 182 DEFINE_BOOL(use_strict, false, "enforce strict mode") 183 184 DEFINE_BOOL(es_staging, false, 185 "enable test-worthy harmony features (for internal use only)") 186 DEFINE_BOOL(harmony, false, "enable all completed harmony features") 187 DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features") 188 DEFINE_IMPLICATION(es_staging, harmony) 189 190 191 // Activate on ClusterFuzz. 192 DEFINE_IMPLICATION(es_staging, harmony_regexp_lookbehind) 193 DEFINE_IMPLICATION(es_staging, move_object_start) 194 195 // Features that are still work in progress (behind individual flags). 196 #define HARMONY_INPROGRESS(V) \ 197 V(harmony_array_prototype_values, "harmony Array.prototype.values") \ 198 V(harmony_function_sent, "harmony function.sent") \ 199 V(harmony_sharedarraybuffer, "harmony sharedarraybuffer") \ 200 V(harmony_simd, "harmony simd") \ 201 V(harmony_do_expressions, "harmony do-expressions") \ 202 V(harmony_regexp_named_captures, "harmony regexp named captures") \ 203 V(harmony_regexp_property, "harmony unicode regexp property classes") \ 204 V(harmony_class_fields, "harmony public fields in class literals") 205 206 // Features that are complete (but still behind --harmony/es-staging flag). 207 #define HARMONY_STAGED_BASE(V) \ 208 V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \ 209 V(harmony_restrictive_generators, \ 210 "harmony restrictions on generator declarations") \ 211 V(harmony_tailcalls, "harmony tail calls") \ 212 V(harmony_trailing_commas, \ 213 "harmony trailing commas in function parameter lists") \ 214 V(harmony_string_padding, "harmony String-padding methods") 215 216 #ifdef V8_I18N_SUPPORT 217 #define HARMONY_STAGED(V) \ 218 HARMONY_STAGED_BASE(V) \ 219 V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts") \ 220 V(icu_case_mapping, "case mapping with ICU rather than Unibrow") 221 #else 222 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V) 223 #endif 224 225 // Features that are shipping (turned on by default, but internal flag remains). 226 #define HARMONY_SHIPPING(V) V(harmony_async_await, "harmony async-await") 227 228 // Once a shipping feature has proved stable in the wild, it will be dropped 229 // from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed, 230 // and associated tests are moved from the harmony directory to the appropriate 231 // esN directory. 232 233 234 #define FLAG_INPROGRESS_FEATURES(id, description) \ 235 DEFINE_BOOL(id, false, "enable " #description " (in progress)") 236 HARMONY_INPROGRESS(FLAG_INPROGRESS_FEATURES) 237 #undef FLAG_INPROGRESS_FEATURES 238 239 #define FLAG_STAGED_FEATURES(id, description) \ 240 DEFINE_BOOL(id, false, "enable " #description) \ 241 DEFINE_IMPLICATION(harmony, id) 242 HARMONY_STAGED(FLAG_STAGED_FEATURES) 243 #undef FLAG_STAGED_FEATURES 244 245 #define FLAG_SHIPPING_FEATURES(id, description) \ 246 DEFINE_BOOL(id, true, "enable " #description) \ 247 DEFINE_NEG_NEG_IMPLICATION(harmony_shipping, id) 248 HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES) 249 #undef FLAG_SHIPPING_FEATURES 250 251 DEFINE_BOOL(future, false, 252 "Implies all staged features that we want to ship in the " 253 "not-too-far future") 254 DEFINE_IMPLICATION(future, ignition_staging) 255 256 // Flags for experimental implementation features. 257 DEFINE_BOOL(allocation_site_pretenuring, true, 258 "pretenure with allocation sites") 259 DEFINE_BOOL(page_promotion, true, "promote pages based on utilization") 260 DEFINE_INT(page_promotion_threshold, 70, 261 "min percentage of live bytes on a page to enable fast evacuation") 262 DEFINE_BOOL(trace_pretenuring, false, 263 "trace pretenuring decisions of HAllocate instructions") 264 DEFINE_BOOL(trace_pretenuring_statistics, false, 265 "trace allocation site pretenuring statistics") 266 DEFINE_BOOL(track_fields, true, "track fields with only smi values") 267 DEFINE_BOOL(track_double_fields, true, "track fields with double values") 268 DEFINE_BOOL(track_heap_object_fields, true, "track fields with heap values") 269 DEFINE_BOOL(track_computed_fields, true, "track computed boilerplate fields") 270 DEFINE_IMPLICATION(track_double_fields, track_fields) 271 DEFINE_IMPLICATION(track_heap_object_fields, track_fields) 272 DEFINE_IMPLICATION(track_computed_fields, track_fields) 273 DEFINE_BOOL(track_field_types, true, "track field types") 274 DEFINE_IMPLICATION(track_field_types, track_fields) 275 DEFINE_IMPLICATION(track_field_types, track_heap_object_fields) 276 DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations") 277 DEFINE_BOOL(mark_shared_functions_for_tier_up, true, 278 "mark shared functions for tier up") 279 280 // Flags for optimization types. 281 DEFINE_BOOL(optimize_for_size, false, 282 "Enables optimizations which favor memory size over execution " 283 "speed") 284 285 DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1) 286 287 // Flags for data representation optimizations 288 DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles") 289 DEFINE_BOOL(string_slices, true, "use string slices") 290 291 // Flags for Ignition. 292 DEFINE_BOOL(ignition, false, "use ignition interpreter") 293 DEFINE_BOOL(ignition_staging, false, "use ignition with all staged features") 294 DEFINE_IMPLICATION(ignition_staging, ignition) 295 DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter") 296 DEFINE_BOOL(ignition_deadcode, true, 297 "use ignition dead code elimination optimizer") 298 DEFINE_BOOL(ignition_osr, true, "enable support for OSR from ignition code") 299 DEFINE_BOOL(ignition_peephole, true, "use ignition peephole optimizer") 300 DEFINE_BOOL(ignition_reo, true, "use ignition register equivalence optimizer") 301 DEFINE_BOOL(ignition_filter_expression_positions, true, 302 "filter expression positions before the bytecode pipeline") 303 DEFINE_BOOL(print_bytecode, false, 304 "print bytecode generated by ignition interpreter") 305 DEFINE_BOOL(trace_ignition, false, 306 "trace the bytecodes executed by the ignition interpreter") 307 DEFINE_BOOL(trace_ignition_codegen, false, 308 "trace the codegen of ignition interpreter bytecode handlers") 309 DEFINE_BOOL(trace_ignition_dispatches, false, 310 "traces the dispatches to bytecode handlers by the ignition " 311 "interpreter") 312 DEFINE_STRING(trace_ignition_dispatches_output_file, nullptr, 313 "the file to which the bytecode handler dispatch table is " 314 "written (by default, the table is not written to a file)") 315 316 // Flags for Crankshaft. 317 DEFINE_BOOL(crankshaft, true, "use crankshaft") 318 DEFINE_STRING(hydrogen_filter, "*", "optimization filter") 319 DEFINE_BOOL(use_gvn, true, "use hydrogen global value numbering") 320 DEFINE_INT(gvn_iterations, 3, "maximum number of GVN fix-point iterations") 321 DEFINE_BOOL(use_canonicalizing, true, "use hydrogen instruction canonicalizing") 322 DEFINE_BOOL(use_inlining, true, "use function inlining") 323 DEFINE_BOOL(use_escape_analysis, true, "use hydrogen escape analysis") 324 DEFINE_BOOL(use_allocation_folding, true, "use allocation folding") 325 DEFINE_BOOL(use_local_allocation_folding, false, "only fold in basic blocks") 326 DEFINE_BOOL(use_write_barrier_elimination, true, 327 "eliminate write barriers targeting allocations in optimized code") 328 DEFINE_INT(max_inlining_levels, 5, "maximum number of inlining levels") 329 DEFINE_INT(max_inlined_source_size, 600, 330 "maximum source size in bytes considered for a single inlining") 331 DEFINE_INT(max_inlined_nodes, 200, 332 "maximum number of AST nodes considered for a single inlining") 333 DEFINE_INT(max_inlined_nodes_cumulative, 400, 334 "maximum cumulative number of AST nodes considered for inlining") 335 DEFINE_BOOL(loop_invariant_code_motion, true, "loop invariant code motion") 336 DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions") 337 DEFINE_BOOL(collect_megamorphic_maps_from_stub_cache, false, 338 "crankshaft harvests type feedback from stub cache") 339 DEFINE_BOOL(hydrogen_stats, false, "print statistics for hydrogen") 340 DEFINE_BOOL(trace_check_elimination, false, "trace check elimination phase") 341 DEFINE_BOOL(trace_environment_liveness, false, 342 "trace liveness of local variable slots") 343 DEFINE_BOOL(trace_hydrogen, false, "trace generated hydrogen to file") 344 DEFINE_STRING(trace_hydrogen_filter, "*", "hydrogen tracing filter") 345 DEFINE_BOOL(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs") 346 DEFINE_STRING(trace_hydrogen_file, NULL, "trace hydrogen to given file name") 347 DEFINE_STRING(trace_phase, "HLZ", "trace generated IR for specified phases") 348 DEFINE_BOOL(trace_inlining, false, "trace inlining decisions") 349 DEFINE_BOOL(trace_load_elimination, false, "trace load elimination") 350 DEFINE_BOOL(trace_store_elimination, false, "trace store elimination") 351 DEFINE_BOOL(turbo_verify_store_elimination, false, 352 "verify store elimination more rigorously") 353 DEFINE_BOOL(trace_alloc, false, "trace register allocator") 354 DEFINE_BOOL(trace_all_uses, false, "trace all use positions") 355 DEFINE_BOOL(trace_range, false, "trace range analysis") 356 DEFINE_BOOL(trace_gvn, false, "trace global value numbering") 357 DEFINE_BOOL(trace_representation, false, "trace representation types") 358 DEFINE_BOOL(trace_removable_simulates, false, "trace removable simulates") 359 DEFINE_BOOL(trace_escape_analysis, false, "trace hydrogen escape analysis") 360 DEFINE_BOOL(trace_allocation_folding, false, "trace allocation folding") 361 DEFINE_BOOL(trace_track_allocation_sites, false, 362 "trace the tracking of allocation sites") 363 DEFINE_BOOL(trace_migration, false, "trace object migration") 364 DEFINE_BOOL(trace_generalization, false, "trace map generalization") 365 DEFINE_BOOL(stress_pointer_maps, false, "pointer map for every instruction") 366 DEFINE_BOOL(stress_environments, false, "environment for every instruction") 367 DEFINE_INT(deopt_every_n_times, 0, 368 "deoptimize every n times a deopt point is passed") 369 DEFINE_INT(deopt_every_n_garbage_collections, 0, 370 "deoptimize every n garbage collections") 371 DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points") 372 DEFINE_BOOL(trap_on_deopt, false, "put a break point before deoptimizing") 373 DEFINE_BOOL(trap_on_stub_deopt, false, 374 "put a break point before deoptimizing a stub") 375 DEFINE_BOOL(deoptimize_uncommon_cases, true, "deoptimize uncommon cases") 376 DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining") 377 DEFINE_BOOL(use_osr, true, "use on-stack replacement") 378 DEFINE_BOOL(array_bounds_checks_elimination, true, 379 "perform array bounds checks elimination") 380 DEFINE_BOOL(trace_bce, false, "trace array bounds check elimination") 381 DEFINE_BOOL(array_index_dehoisting, true, "perform array index dehoisting") 382 DEFINE_BOOL(analyze_environment_liveness, true, 383 "analyze liveness of environment slots and zap dead values") 384 DEFINE_BOOL(load_elimination, true, "use load elimination") 385 DEFINE_BOOL(check_elimination, true, "use check elimination") 386 DEFINE_BOOL(store_elimination, false, "use store elimination") 387 DEFINE_BOOL(dead_code_elimination, true, "use dead code elimination") 388 DEFINE_BOOL(fold_constants, true, "use constant folding") 389 DEFINE_BOOL(trace_dead_code_elimination, false, "trace dead code elimination") 390 DEFINE_BOOL(unreachable_code_elimination, true, "eliminate unreachable code") 391 DEFINE_BOOL(trace_osr, false, "trace on-stack replacement") 392 DEFINE_INT(stress_runs, 0, "number of stress runs") 393 DEFINE_BOOL(lookup_sample_by_shared, true, 394 "when picking a function to optimize, watch for shared function " 395 "info, not JSFunction itself") 396 DEFINE_BOOL(flush_optimized_code_cache, false, 397 "flushes the cache of optimized code for closures on every GC") 398 DEFINE_BOOL(inline_construct, true, "inline constructor calls") 399 DEFINE_BOOL(inline_arguments, true, "inline functions with arguments object") 400 DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors") 401 DEFINE_BOOL(inline_into_try, true, "inline into try blocks") 402 DEFINE_INT(escape_analysis_iterations, 2, 403 "maximum number of escape analysis fix-point iterations") 404 405 DEFINE_BOOL(concurrent_recompilation, true, 406 "optimizing hot functions asynchronously on a separate thread") 407 DEFINE_BOOL(trace_concurrent_recompilation, false, 408 "track concurrent recompilation") 409 DEFINE_INT(concurrent_recompilation_queue_length, 8, 410 "the length of the concurrent compilation queue") 411 DEFINE_INT(concurrent_recompilation_delay, 0, 412 "artificial compilation delay in ms") 413 DEFINE_BOOL(block_concurrent_recompilation, false, 414 "block queued jobs until released") 415 416 DEFINE_BOOL(omit_map_checks_for_leaf_maps, true, 417 "do not emit check maps for constant values that have a leaf map, " 418 "deoptimize the optimized code if the layout of the maps changes.") 419 420 // Flags for TurboFan. 421 DEFINE_BOOL(turbo, false, "enable TurboFan compiler") 422 DEFINE_IMPLICATION(turbo, turbo_asm_deoptimization) 423 DEFINE_IMPLICATION(turbo, turbo_loop_peeling) 424 DEFINE_IMPLICATION(turbo, turbo_escape) 425 DEFINE_BOOL(turbo_sp_frame_access, false, 426 "use stack pointer-relative access to frame wherever possible") 427 DEFINE_BOOL(turbo_preprocess_ranges, true, 428 "run pre-register allocation heuristics") 429 DEFINE_BOOL(turbo_loop_stackcheck, true, "enable stack checks in loops") 430 DEFINE_STRING(turbo_filter, "~~", "optimization filter for TurboFan compiler") 431 DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR") 432 DEFINE_BOOL(trace_turbo_graph, false, "trace generated TurboFan graphs") 433 DEFINE_IMPLICATION(trace_turbo_graph, trace_turbo) 434 DEFINE_STRING(trace_turbo_cfg_file, NULL, 435 "trace turbo cfg graph (for C1 visualizer) to a given file name") 436 DEFINE_BOOL(trace_turbo_types, true, "trace TurboFan's types") 437 DEFINE_BOOL(trace_turbo_scheduler, false, "trace TurboFan's scheduler") 438 DEFINE_BOOL(trace_turbo_reduction, false, "trace TurboFan's various reducers") 439 DEFINE_BOOL(trace_turbo_trimming, false, "trace TurboFan's graph trimmer") 440 DEFINE_BOOL(trace_turbo_jt, false, "trace TurboFan's jump threading") 441 DEFINE_BOOL(trace_turbo_ceq, false, "trace TurboFan's control equivalence") 442 DEFINE_BOOL(trace_turbo_loop, false, "trace TurboFan's loop optimizations") 443 DEFINE_BOOL(turbo_asm, true, "enable TurboFan for asm.js code") 444 DEFINE_BOOL(turbo_asm_deoptimization, false, 445 "enable deoptimization in TurboFan for asm.js code") 446 DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase") 447 DEFINE_STRING(turbo_verify_machine_graph, nullptr, 448 "verify TurboFan machine graph before instruction selection") 449 DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics") 450 DEFINE_BOOL(turbo_stats_nvp, false, 451 "print TurboFan statistics in machine-readable format") 452 DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan") 453 DEFINE_BOOL(turbo_type_feedback, true, 454 "use typed feedback for representation inference in Turbofan") 455 DEFINE_BOOL(function_context_specialization, false, 456 "enable function context specialization in TurboFan") 457 DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan") 458 DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining") 459 DEFINE_BOOL(turbo_load_elimination, true, "enable load elimination in TurboFan") 460 DEFINE_BOOL(trace_turbo_load_elimination, false, 461 "trace TurboFan load elimination") 462 DEFINE_BOOL(loop_assignment_analysis, true, "perform loop assignment analysis") 463 DEFINE_BOOL(turbo_profiling, false, "enable profiling in TurboFan") 464 DEFINE_BOOL(turbo_verify_allocation, DEBUG_BOOL, 465 "verify register allocation in TurboFan") 466 DEFINE_BOOL(turbo_move_optimization, true, "optimize gap moves in TurboFan") 467 DEFINE_BOOL(turbo_jt, true, "enable jump threading in TurboFan") 468 DEFINE_BOOL(turbo_stress_loop_peeling, false, 469 "stress loop peeling optimization") 470 DEFINE_BOOL(turbo_loop_peeling, false, "Turbofan loop peeling") 471 DEFINE_BOOL(turbo_loop_variable, true, "Turbofan loop variable optimization") 472 DEFINE_BOOL(turbo_cf_optimization, true, "optimize control flow in TurboFan") 473 DEFINE_BOOL(turbo_frame_elision, true, "elide frames in TurboFan") 474 DEFINE_BOOL(turbo_escape, false, "enable escape analysis") 475 DEFINE_BOOL(turbo_instruction_scheduling, false, 476 "enable instruction scheduling in TurboFan") 477 DEFINE_BOOL(turbo_stress_instruction_scheduling, false, 478 "randomly schedule instructions to stress dependency tracking") 479 DEFINE_BOOL(turbo_store_elimination, true, 480 "enable store-store elimination in TurboFan") 481 482 // Flags to help platform porters 483 DEFINE_BOOL(minimal, false, 484 "simplifies execution model to make porting " 485 "easier (e.g. always use Ignition, never use Crankshaft") 486 DEFINE_IMPLICATION(minimal, ignition) 487 DEFINE_NEG_IMPLICATION(minimal, crankshaft) 488 DEFINE_NEG_IMPLICATION(minimal, use_ic) 489 490 // Flags for native WebAssembly. 491 DEFINE_BOOL(expose_wasm, false, "expose WASM interface to JavaScript") 492 DEFINE_INT(wasm_num_compilation_tasks, 10, 493 "number of parallel compilation tasks for wasm") 494 DEFINE_BOOL(trace_wasm_encoder, false, "trace encoding of wasm code") 495 DEFINE_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code") 496 DEFINE_BOOL(trace_wasm_decode_time, false, "trace decoding time of wasm code") 497 DEFINE_BOOL(trace_wasm_compiler, false, "trace compiling of wasm code") 498 DEFINE_BOOL(trace_wasm_interpreter, false, "trace interpretation of wasm code") 499 DEFINE_INT(trace_wasm_ast_start, 0, 500 "start function for WASM AST trace (inclusive)") 501 DEFINE_INT(trace_wasm_ast_end, 0, "end function for WASM AST trace (exclusive)") 502 DEFINE_INT(skip_compiling_wasm_funcs, 0, "start compiling at function N") 503 DEFINE_BOOL(wasm_break_on_decoder_error, false, 504 "debug break when wasm decoder encounters an error") 505 DEFINE_BOOL(wasm_loop_assignment_analysis, true, 506 "perform loop assignment analysis for WASM") 507 508 DEFINE_BOOL(validate_asm, false, "validate asm.js modules before compiling") 509 510 DEFINE_BOOL(dump_wasm_module, false, "dump WASM module bytes") 511 DEFINE_STRING(dump_wasm_module_path, NULL, "directory to dump wasm modules to") 512 513 DEFINE_INT(typed_array_max_size_in_heap, 64, 514 "threshold for in-heap typed array") 515 516 DEFINE_BOOL(wasm_simd_prototype, false, 517 "enable prototype simd opcodes for wasm") 518 DEFINE_BOOL(wasm_eh_prototype, false, 519 "enable prototype exception handling opcodes for wasm") 520 DEFINE_BOOL(wasm_mv_prototype, false, 521 "enable prototype multi-value support for wasm") 522 DEFINE_BOOL(wasm_atomics_prototype, false, 523 "enable prototype atomic opcodes for wasm") 524 525 DEFINE_BOOL(wasm_trap_handler, false, 526 "use signal handlers to catch out of bounds memory access in wasm" 527 " (currently Linux x86_64 only)") 528 529 // Profiler flags. 530 DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler") 531 // 0x1800 fits in the immediate field of an ARM instruction. 532 DEFINE_INT(interrupt_budget, 0x1800, 533 "execution budget before interrupt is triggered") 534 DEFINE_INT(type_info_threshold, 25, 535 "percentage of ICs that must have type info to allow optimization") 536 DEFINE_INT(generic_ic_threshold, 30, 537 "max percentage of megamorphic/generic ICs to allow optimization") 538 DEFINE_INT(self_opt_count, 130, "call count before self-optimization") 539 540 DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing") 541 DEFINE_IMPLICATION(trace_opt_verbose, trace_opt) 542 543 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc 544 DEFINE_BOOL(debug_code, false, "generate extra code (assertions) for debugging") 545 DEFINE_BOOL(code_comments, false, "emit comments in code disassembly") 546 DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 instructions if available") 547 DEFINE_BOOL(enable_ssse3, true, "enable use of SSSE3 instructions if available") 548 DEFINE_BOOL(enable_sse4_1, true, 549 "enable use of SSE4.1 instructions if available") 550 DEFINE_BOOL(enable_sahf, true, 551 "enable use of SAHF instruction if available (X64 only)") 552 DEFINE_BOOL(enable_avx, true, "enable use of AVX instructions if available") 553 DEFINE_BOOL(enable_fma3, true, "enable use of FMA3 instructions if available") 554 DEFINE_BOOL(enable_bmi1, true, "enable use of BMI1 instructions if available") 555 DEFINE_BOOL(enable_bmi2, true, "enable use of BMI2 instructions if available") 556 DEFINE_BOOL(enable_lzcnt, true, "enable use of LZCNT instruction if available") 557 DEFINE_BOOL(enable_popcnt, true, 558 "enable use of POPCNT instruction if available") 559 DEFINE_STRING(arm_arch, ARM_ARCH_DEFAULT, 560 "generate instructions for the selected ARM architecture if " 561 "available: armv6, armv7, armv7+sudiv or armv8") 562 DEFINE_BOOL(enable_vldr_imm, false, 563 "enable use of constant pools for double immediate (ARM only)") 564 DEFINE_BOOL(force_long_branches, false, 565 "force all emitted branches to be in long mode (MIPS/PPC only)") 566 DEFINE_STRING(mcpu, "auto", "enable optimization for specific cpu") 567 568 // Deprecated ARM flags (replaced by arm_arch). 569 DEFINE_MAYBE_BOOL(enable_armv7, "deprecated (use --arm_arch instead)") 570 DEFINE_MAYBE_BOOL(enable_vfp3, "deprecated (use --arm_arch instead)") 571 DEFINE_MAYBE_BOOL(enable_32dregs, "deprecated (use --arm_arch instead)") 572 DEFINE_MAYBE_BOOL(enable_neon, "deprecated (use --arm_arch instead)") 573 DEFINE_MAYBE_BOOL(enable_sudiv, "deprecated (use --arm_arch instead)") 574 DEFINE_MAYBE_BOOL(enable_armv8, "deprecated (use --arm_arch instead)") 575 576 // regexp-macro-assembler-*.cc 577 DEFINE_BOOL(enable_regexp_unaligned_accesses, true, 578 "enable unaligned accesses for the regexp engine") 579 580 // api.cc 581 DEFINE_BOOL(script_streaming, true, "enable parsing on background") 582 583 // bootstrapper.cc 584 DEFINE_STRING(expose_natives_as, NULL, "expose natives in global object") 585 DEFINE_STRING(expose_debug_as, NULL, "expose debug in global object") 586 DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension") 587 DEFINE_BOOL(expose_gc, false, "expose gc extension") 588 DEFINE_STRING(expose_gc_as, NULL, 589 "expose gc extension under the specified name") 590 DEFINE_IMPLICATION(expose_gc_as, expose_gc) 591 DEFINE_BOOL(expose_externalize_string, false, 592 "expose externalize string extension") 593 DEFINE_BOOL(expose_trigger_failure, false, "expose trigger-failure extension") 594 DEFINE_INT(stack_trace_limit, 10, "number of stack frames to capture") 595 DEFINE_BOOL(builtins_in_stack_traces, false, 596 "show built-in functions in stack traces") 597 598 // builtins.cc 599 DEFINE_BOOL(allow_unsafe_function_constructor, false, 600 "allow invoking the function constructor without security checks") 601 602 // builtins-ia32.cc 603 DEFINE_BOOL(inline_new, true, "use fast inline allocation") 604 605 // codegen-ia32.cc / codegen-arm.cc 606 DEFINE_BOOL(trace_codegen, false, 607 "print name of functions for which code is generated") 608 DEFINE_BOOL(trace, false, "trace function calls") 609 DEFINE_BOOL(mask_constants_with_cookie, true, 610 "use random jit cookie to mask large constants") 611 612 // codegen.cc 613 DEFINE_BOOL(lazy, true, "use lazy compilation") 614 DEFINE_BOOL(trace_opt, false, "trace lazy optimization") 615 DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics") 616 DEFINE_BOOL(trace_file_names, false, 617 "include file names in trace-opt/trace-deopt output") 618 DEFINE_BOOL(opt, true, "use adaptive optimizations") 619 DEFINE_BOOL(always_opt, false, "always try to optimize functions") 620 DEFINE_BOOL(always_osr, false, "always try to OSR functions") 621 DEFINE_BOOL(prepare_always_opt, false, "prepare for turning on always opt") 622 DEFINE_BOOL(trace_deopt, false, "trace optimize function deoptimization") 623 DEFINE_BOOL(trace_stub_failures, false, 624 "trace deoptimization of generated code stubs") 625 626 DEFINE_BOOL(serialize_toplevel, true, "enable caching of toplevel scripts") 627 DEFINE_BOOL(serialize_eager, false, "compile eagerly when caching scripts") 628 DEFINE_BOOL(serialize_age_code, false, "pre age code in the code cache") 629 DEFINE_BOOL(trace_serializer, false, "print code serializer trace") 630 #ifdef DEBUG 631 DEFINE_BOOL(external_reference_stats, false, 632 "print statistics on external references used during serialization") 633 #endif // DEBUG 634 635 // compiler.cc 636 DEFINE_INT(min_preparse_length, 1024, 637 "minimum length for automatic enable preparsing") 638 DEFINE_INT(max_opt_count, 10, 639 "maximum number of optimization attempts before giving up.") 640 641 // compilation-cache.cc 642 DEFINE_BOOL(compilation_cache, true, "enable compilation cache") 643 644 DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions") 645 646 // cpu-profiler.cc 647 DEFINE_INT(cpu_profiler_sampling_interval, 1000, 648 "CPU profiler sampling interval in microseconds") 649 650 // Array abuse tracing 651 DEFINE_BOOL(trace_js_array_abuse, false, 652 "trace out-of-bounds accesses to JS arrays") 653 DEFINE_BOOL(trace_external_array_abuse, false, 654 "trace out-of-bounds-accesses to external arrays") 655 DEFINE_BOOL(trace_array_abuse, false, 656 "trace out-of-bounds accesses to all arrays") 657 DEFINE_IMPLICATION(trace_array_abuse, trace_js_array_abuse) 658 DEFINE_IMPLICATION(trace_array_abuse, trace_external_array_abuse) 659 660 // debugger 661 DEFINE_BOOL(trace_debug_json, false, "trace debugging JSON request/response") 662 DEFINE_BOOL(enable_liveedit, true, "enable liveedit experimental feature") 663 DEFINE_BOOL(hard_abort, true, "abort by crashing") 664 665 // execution.cc 666 DEFINE_INT(stack_size, V8_DEFAULT_STACK_SIZE_KB, 667 "default size of stack region v8 is allowed to use (in kBytes)") 668 669 // frames.cc 670 DEFINE_INT(max_stack_trace_source_length, 300, 671 "maximum length of function source code printed in a stack trace.") 672 673 // full-codegen.cc 674 DEFINE_BOOL(always_inline_smi_code, false, 675 "always inline smi code in non-opt code") 676 DEFINE_BOOL(verify_operand_stack_depth, false, 677 "emit debug code that verifies the static tracking of the operand " 678 "stack depth") 679 680 // heap.cc 681 DEFINE_INT(min_semi_space_size, 0, 682 "min size of a semi-space (in MBytes), the new space consists of two" 683 "semi-spaces") 684 DEFINE_INT(max_semi_space_size, 0, 685 "max size of a semi-space (in MBytes), the new space consists of two" 686 "semi-spaces") 687 DEFINE_INT(semi_space_growth_factor, 2, "factor by which to grow the new space") 688 DEFINE_BOOL(experimental_new_space_growth_heuristic, false, 689 "Grow the new space based on the percentage of survivors instead " 690 "of their absolute value.") 691 DEFINE_INT(max_old_space_size, 0, "max size of the old space (in Mbytes)") 692 DEFINE_INT(initial_old_space_size, 0, "initial old space size (in Mbytes)") 693 DEFINE_INT(max_executable_size, 0, "max size of executable memory (in Mbytes)") 694 DEFINE_BOOL(gc_global, false, "always perform global GCs") 695 DEFINE_INT(gc_interval, -1, "garbage collect after <n> allocations") 696 DEFINE_INT(retain_maps_for_n_gc, 2, 697 "keeps maps alive for <n> old space garbage collections") 698 DEFINE_BOOL(trace_gc, false, 699 "print one trace line following each garbage collection") 700 DEFINE_BOOL(trace_gc_nvp, false, 701 "print one detailed trace line in name=value format " 702 "after each garbage collection") 703 DEFINE_BOOL(trace_gc_ignore_scavenger, false, 704 "do not print trace line after scavenger collection") 705 DEFINE_BOOL(trace_idle_notification, false, 706 "print one trace line following each idle notification") 707 DEFINE_BOOL(trace_idle_notification_verbose, false, 708 "prints the heap state used by the idle notification") 709 DEFINE_BOOL(print_max_heap_committed, false, 710 "print statistics of the maximum memory committed for the heap " 711 "in name=value format on exit") 712 DEFINE_BOOL(trace_gc_verbose, false, 713 "print more details following each garbage collection") 714 DEFINE_INT(trace_allocation_stack_interval, -1, 715 "print stack trace after <n> free-list allocations") 716 DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space") 717 DEFINE_BOOL(trace_fragmentation_verbose, false, 718 "report fragmentation for old space (detailed)") 719 DEFINE_BOOL(trace_evacuation, false, "report evacuation statistics") 720 DEFINE_BOOL(trace_mutator_utilization, false, 721 "print mutator utilization, allocation speed, gc speed") 722 DEFINE_BOOL(weak_embedded_maps_in_optimized_code, true, 723 "make maps embedded in optimized code weak") 724 DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true, 725 "make objects embedded in optimized code weak") 726 DEFINE_BOOL(flush_code, true, "flush code that we expect not to use again") 727 DEFINE_BOOL(trace_code_flushing, false, "trace code flushing progress") 728 DEFINE_BOOL(age_code, true, 729 "track un-executed functions to age code and flush only " 730 "old code (required for code flushing)") 731 DEFINE_BOOL(incremental_marking, true, "use incremental marking") 732 DEFINE_BOOL(incremental_marking_wrappers, true, 733 "use incremental marking for marking wrappers") 734 DEFINE_INT(min_progress_during_incremental_marking_finalization, 32, 735 "keep finalizing incremental marking as long as we discover at " 736 "least this many unmarked objects") 737 DEFINE_INT(max_incremental_marking_finalization_rounds, 3, 738 "at most try this many times to finalize incremental marking") 739 DEFINE_BOOL(minor_mc, false, "perform young generation mark compact GCs") 740 DEFINE_NEG_IMPLICATION(minor_mc, incremental_marking) 741 DEFINE_BOOL(black_allocation, false, "use black allocation") 742 DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping") 743 DEFINE_BOOL(parallel_compaction, true, "use parallel compaction") 744 DEFINE_BOOL(parallel_pointer_update, true, 745 "use parallel pointer update during compaction") 746 DEFINE_BOOL(trace_incremental_marking, false, 747 "trace progress of the incremental marking") 748 DEFINE_BOOL(track_gc_object_stats, false, 749 "track object counts and memory usage") 750 DEFINE_BOOL(trace_gc_object_stats, false, 751 "trace object counts and memory usage") 752 DEFINE_INT(gc_stats, 0, "Used by tracing internally to enable gc statistics") 753 DEFINE_IMPLICATION(trace_gc_object_stats, track_gc_object_stats) 754 DEFINE_VALUE_IMPLICATION(track_gc_object_stats, gc_stats, 1) 755 DEFINE_VALUE_IMPLICATION(trace_gc_object_stats, gc_stats, 1) 756 DEFINE_NEG_IMPLICATION(trace_gc_object_stats, incremental_marking) 757 DEFINE_BOOL(track_detached_contexts, true, 758 "track native contexts that are expected to be garbage collected") 759 DEFINE_BOOL(trace_detached_contexts, false, 760 "trace native contexts that are expected to be garbage collected") 761 DEFINE_IMPLICATION(trace_detached_contexts, track_detached_contexts) 762 #ifdef VERIFY_HEAP 763 DEFINE_BOOL(verify_heap, false, "verify heap pointers before and after GC") 764 #endif 765 DEFINE_BOOL(move_object_start, true, "enable moving of object starts") 766 DEFINE_BOOL(memory_reducer, true, "use memory reducer") 767 DEFINE_INT(heap_growing_percent, 0, 768 "specifies heap growing factor as (1 + heap_growing_percent/100)") 769 770 // spaces.cc 771 DEFINE_INT(v8_os_page_size, 0, "override OS page size (in KBytes)") 772 773 // execution.cc, messages.cc 774 DEFINE_BOOL(clear_exceptions_on_js_entry, false, 775 "clear pending exceptions when entering JavaScript") 776 777 // counters.cc 778 DEFINE_INT(histogram_interval, 600000, 779 "time interval in ms for aggregating memory histograms") 780 781 // global-handles.cc 782 DEFINE_BOOL(trace_object_groups, false, 783 "print object groups detected during each garbage collection") 784 785 // heap-snapshot-generator.cc 786 DEFINE_BOOL(heap_profiler_trace_objects, false, 787 "Dump heap object allocations/movements/size_updates") 788 789 790 // sampling-heap-profiler.cc 791 DEFINE_BOOL(sampling_heap_profiler_suppress_randomness, false, 792 "Use constant sample intervals to eliminate test flakiness") 793 794 795 // v8.cc 796 DEFINE_BOOL(use_idle_notification, true, 797 "Use idle notification to reduce memory footprint.") 798 // ic.cc 799 DEFINE_BOOL(use_ic, true, "use inline caching") 800 DEFINE_BOOL(trace_ic, false, "trace inline cache state transitions") 801 DEFINE_BOOL_READONLY(tf_load_ic_stub, true, "use TF LoadIC stub") 802 DEFINE_BOOL(tf_store_ic_stub, true, "use TF StoreIC stub") 803 804 // macro-assembler-ia32.cc 805 DEFINE_BOOL(native_code_counters, false, 806 "generate extra code for manipulating stats counters") 807 808 // mark-compact.cc 809 DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC") 810 DEFINE_BOOL(never_compact, false, 811 "Never perform compaction on full GC - testing only") 812 DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections") 813 DEFINE_BOOL(cleanup_code_caches_at_gc, true, 814 "Flush inline caches prior to mark compact collection and " 815 "flush code caches in maps during mark compact cycle.") 816 DEFINE_BOOL(use_marking_progress_bar, true, 817 "Use a progress bar to scan large objects in increments when " 818 "incremental marking is active.") 819 DEFINE_BOOL(zap_code_space, DEBUG_BOOL, 820 "Zap free memory in code space with 0xCC while sweeping.") 821 DEFINE_INT(random_seed, 0, 822 "Default seed for initializing random generator " 823 "(0, the default, means to use system random).") 824 825 // objects.cc 826 DEFINE_BOOL(trace_weak_arrays, false, "Trace WeakFixedArray usage") 827 DEFINE_BOOL(trace_prototype_users, false, 828 "Trace updates to prototype user tracking") 829 DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing") 830 DEFINE_BOOL(trace_for_in_enumerate, false, "Trace for-in enumerate slow-paths") 831 #if TRACE_MAPS 832 DEFINE_BOOL(trace_maps, false, "trace map creation") 833 #endif 834 835 // parser.cc 836 DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax") 837 DEFINE_BOOL(trace_parse, false, "trace parsing and preparsing") 838 DEFINE_BOOL(trace_preparse, false, "trace preparsing decisions") 839 DEFINE_BOOL(lazy_inner_functions, false, "enable lazy parsing inner functions") 840 841 // simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc 842 DEFINE_BOOL(trace_sim, false, "Trace simulator execution") 843 DEFINE_BOOL(debug_sim, false, "Enable debugging the simulator") 844 DEFINE_BOOL(check_icache, false, 845 "Check icache flushes in ARM and MIPS simulator") 846 DEFINE_INT(stop_sim_at, 0, "Simulator stop after x number of instructions") 847 #if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) || \ 848 defined(V8_TARGET_ARCH_PPC64) 849 DEFINE_INT(sim_stack_alignment, 16, 850 "Stack alignment in bytes in simulator. This must be a power of two " 851 "and it must be at least 16. 16 is default.") 852 #else 853 DEFINE_INT(sim_stack_alignment, 8, 854 "Stack alingment in bytes in simulator (4 or 8, 8 is default)") 855 #endif 856 DEFINE_INT(sim_stack_size, 2 * MB / KB, 857 "Stack size of the ARM64, MIPS64 and PPC64 simulator " 858 "in kBytes (default is 2 MB)") 859 DEFINE_BOOL(log_regs_modified, true, 860 "When logging register values, only print modified registers.") 861 DEFINE_BOOL(log_colour, ENABLE_LOG_COLOUR, 862 "When logging, try to use coloured output.") 863 DEFINE_BOOL(ignore_asm_unimplemented_break, false, 864 "Don't break for ASM_UNIMPLEMENTED_BREAK macros.") 865 DEFINE_BOOL(trace_sim_messages, false, 866 "Trace simulator debug messages. Implied by --trace-sim.") 867 868 // isolate.cc 869 DEFINE_BOOL(stack_trace_on_illegal, false, 870 "print stack trace when an illegal exception is thrown") 871 DEFINE_BOOL(abort_on_uncaught_exception, false, 872 "abort program (dump core) when an uncaught exception is thrown") 873 DEFINE_BOOL(abort_on_stack_overflow, false, 874 "Abort program when stack overflow (as opposed to throwing " 875 "RangeError). This is useful for fuzzing where the spec behaviour " 876 "would introduce nondeterminism.") 877 DEFINE_BOOL(randomize_hashes, true, 878 "randomize hashes to avoid predictable hash collisions " 879 "(with snapshots this option cannot override the baked-in seed)") 880 DEFINE_INT(hash_seed, 0, 881 "Fixed seed to use to hash property keys (0 means random)" 882 "(with snapshots this option cannot override the baked-in seed)") 883 DEFINE_BOOL(trace_rail, false, "trace RAIL mode") 884 DEFINE_BOOL(print_all_exceptions, false, 885 "print exception object and stack trace on each thrown exception") 886 887 // runtime.cc 888 DEFINE_BOOL(runtime_call_stats, false, "report runtime call counts and times") 889 DEFINE_INT(runtime_stats, 0, 890 "internal usage only for controlling runtime statistics") 891 DEFINE_VALUE_IMPLICATION(runtime_call_stats, runtime_stats, 1) 892 893 // snapshot-common.cc 894 DEFINE_BOOL(profile_deserialization, false, 895 "Print the time it takes to deserialize the snapshot.") 896 DEFINE_BOOL(serialization_statistics, false, 897 "Collect statistics on serialized objects.") 898 899 // Regexp 900 DEFINE_BOOL(regexp_optimization, true, "generate optimized regexp code") 901 902 // Testing flags test/cctest/test-{flags,api,serialization}.cc 903 DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag") 904 DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag") 905 DEFINE_INT(testing_int_flag, 13, "testing_int_flag") 906 DEFINE_FLOAT(testing_float_flag, 2.5, "float-flag") 907 DEFINE_STRING(testing_string_flag, "Hello, world!", "string-flag") 908 DEFINE_INT(testing_prng_seed, 42, "Seed used for threading test randomness") 909 910 // mksnapshot.cc 911 DEFINE_STRING(startup_src, NULL, 912 "Write V8 startup as C++ src. (mksnapshot only)") 913 DEFINE_STRING(startup_blob, NULL, 914 "Write V8 startup blob file. (mksnapshot only)") 915 916 // code-stubs-hydrogen.cc 917 DEFINE_BOOL(profile_hydrogen_code_stub_compilation, false, 918 "Print the time it takes to lazily compile hydrogen code stubs.") 919 920 // mark-compact.cc 921 DEFINE_BOOL(force_marking_deque_overflows, false, 922 "force overflows of marking deque by reducing it's size " 923 "to 64 words") 924 925 DEFINE_BOOL(stress_compaction, false, 926 "stress the GC compactor to flush out bugs (implies " 927 "--force_marking_deque_overflows)") 928 929 DEFINE_BOOL(manual_evacuation_candidates_selection, false, 930 "Test mode only flag. It allows an unit test to select evacuation " 931 "candidates pages (requires --stress_compaction).") 932 933 DEFINE_BOOL(disable_old_api_accessors, false, 934 "Disable old-style API accessors whose setters trigger through the " 935 "prototype chain") 936 937 // 938 // Dev shell flags 939 // 940 941 DEFINE_BOOL(help, false, "Print usage message, including flags, on console") 942 DEFINE_BOOL(dump_counters, false, "Dump counters on exit") 943 944 DEFINE_STRING(map_counters, "", "Map counters to a file") 945 DEFINE_ARGS(js_arguments, 946 "Pass all remaining arguments to the script. Alias for \"--\".") 947 948 // 949 // GDB JIT integration flags. 950 // 951 #undef FLAG 952 #ifdef ENABLE_GDB_JIT_INTERFACE 953 #define FLAG FLAG_FULL 954 #else 955 #define FLAG FLAG_READONLY 956 #endif 957 958 DEFINE_BOOL(gdbjit, false, "enable GDBJIT interface") 959 DEFINE_BOOL(gdbjit_full, false, "enable GDBJIT interface for all code objects") 960 DEFINE_BOOL(gdbjit_dump, false, "dump elf objects with debug info to disk") 961 DEFINE_STRING(gdbjit_dump_filter, "", 962 "dump only objects containing this substring") 963 964 #ifdef ENABLE_GDB_JIT_INTERFACE 965 DEFINE_IMPLICATION(gdbjit_full, gdbjit) 966 DEFINE_IMPLICATION(gdbjit_dump, gdbjit) 967 #endif 968 DEFINE_NEG_IMPLICATION(gdbjit, compact_code_space) 969 970 // 971 // Debug only flags 972 // 973 #undef FLAG 974 #ifdef DEBUG 975 #define FLAG FLAG_FULL 976 #else 977 #define FLAG FLAG_READONLY 978 #endif 979 980 // checks.cc 981 #ifdef ENABLE_SLOW_DCHECKS 982 DEFINE_BOOL(enable_slow_asserts, false, 983 "enable asserts that are slow to execute") 984 #endif 985 986 // codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc 987 DEFINE_BOOL(print_ast, false, "print source AST") 988 DEFINE_BOOL(print_builtin_ast, false, "print source AST for builtins") 989 DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints") 990 991 // compiler.cc 992 DEFINE_BOOL(print_builtin_scopes, false, "print scopes for builtins") 993 DEFINE_BOOL(print_scopes, false, "print scopes") 994 995 // contexts.cc 996 DEFINE_BOOL(trace_contexts, false, "trace contexts operations") 997 998 // heap.cc 999 DEFINE_BOOL(gc_verbose, false, "print stuff during garbage collection") 1000 DEFINE_BOOL(heap_stats, false, "report heap statistics before and after GC") 1001 DEFINE_BOOL(code_stats, false, "report code statistics after GC") 1002 DEFINE_BOOL(print_handles, false, "report handles after GC") 1003 DEFINE_BOOL(check_handle_count, false, 1004 "Check that there are not too many handles at GC") 1005 DEFINE_BOOL(print_global_handles, false, "report global handles after GC") 1006 1007 // TurboFan debug-only flags. 1008 DEFINE_BOOL(print_turbo_replay, false, 1009 "print C++ code to recreate TurboFan graphs") 1010 DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis") 1011 1012 // objects.cc 1013 DEFINE_BOOL(trace_normalization, false, 1014 "prints when objects are turned into dictionaries.") 1015 1016 // runtime.cc 1017 DEFINE_BOOL(trace_lazy, false, "trace lazy compilation") 1018 1019 // spaces.cc 1020 DEFINE_BOOL(collect_heap_spill_statistics, false, 1021 "report heap spill statistics along with heap_stats " 1022 "(requires heap_stats)") 1023 DEFINE_BOOL(trace_live_bytes, false, 1024 "trace incrementing and resetting of live bytes") 1025 DEFINE_BOOL(trace_isolates, false, "trace isolate state changes") 1026 1027 // Regexp 1028 DEFINE_BOOL(regexp_possessive_quantifier, false, 1029 "enable possessive quantifier syntax for testing") 1030 DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution") 1031 DEFINE_BOOL(trace_regexp_assembler, false, 1032 "trace regexp macro assembler calls.") 1033 DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing") 1034 1035 // Debugger 1036 DEFINE_BOOL(print_break_location, false, "print source location on debug break") 1037 1038 // wasm instance management 1039 DEFINE_BOOL(trace_wasm_instances, false, 1040 "trace creation and collection of wasm instances") 1041 1042 // 1043 // Logging and profiling flags 1044 // 1045 #undef FLAG 1046 #define FLAG FLAG_FULL 1047 1048 // log.cc 1049 DEFINE_BOOL(log, false, 1050 "Minimal logging (no API, code, GC, suspect, or handles samples).") 1051 DEFINE_BOOL(log_all, false, "Log all events to the log file.") 1052 DEFINE_BOOL(log_api, false, "Log API events to the log file.") 1053 DEFINE_BOOL(log_code, false, 1054 "Log code events to the log file without profiling.") 1055 DEFINE_BOOL(log_gc, false, 1056 "Log heap samples on garbage collection for the hp2ps tool.") 1057 DEFINE_BOOL(log_handles, false, "Log global handle events.") 1058 DEFINE_BOOL(log_suspect, false, "Log suspect operations.") 1059 DEFINE_BOOL(prof, false, 1060 "Log statistical profiling information (implies --log-code).") 1061 DEFINE_BOOL(prof_cpp, false, "Like --prof, but ignore generated code.") 1062 DEFINE_IMPLICATION(prof, prof_cpp) 1063 DEFINE_BOOL(prof_browser_mode, true, 1064 "Used with --prof, turns on browser-compatible mode for profiling.") 1065 DEFINE_STRING(logfile, "v8.log", "Specify the name of the log file.") 1066 DEFINE_BOOL(logfile_per_isolate, true, "Separate log files for each isolate.") 1067 DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.") 1068 DEFINE_BOOL(perf_basic_prof, false, 1069 "Enable perf linux profiler (basic support).") 1070 DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space) 1071 DEFINE_BOOL(perf_basic_prof_only_functions, false, 1072 "Only report function code ranges to perf (i.e. no stubs).") 1073 DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof) 1074 DEFINE_BOOL(perf_prof, false, 1075 "Enable perf linux profiler (experimental annotate support).") 1076 DEFINE_NEG_IMPLICATION(perf_prof, compact_code_space) 1077 DEFINE_BOOL(perf_prof_debug_info, false, 1078 "Enable debug info for perf linux profiler (experimental).") 1079 DEFINE_BOOL(perf_prof_unwinding_info, false, 1080 "Enable unwinding info for perf linux profiler (experimental).") 1081 DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__", 1082 "Specify the name of the file for fake gc mmap used in ll_prof") 1083 DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.") 1084 DEFINE_BOOL(log_timer_events, false, 1085 "Time events including external callbacks.") 1086 DEFINE_IMPLICATION(log_timer_events, log_internal_timer_events) 1087 DEFINE_IMPLICATION(log_internal_timer_events, prof) 1088 DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.") 1089 DEFINE_STRING(log_instruction_file, "arm64_inst.csv", 1090 "AArch64 instruction statistics log file.") 1091 DEFINE_INT(log_instruction_period, 1 << 22, 1092 "AArch64 instruction statistics logging period.") 1093 1094 DEFINE_BOOL(redirect_code_traces, false, 1095 "output deopt information and disassembly into file " 1096 "code-<pid>-<isolate id>.asm") 1097 DEFINE_STRING(redirect_code_traces_to, NULL, 1098 "output deopt information and disassembly into the given file") 1099 1100 DEFINE_BOOL(hydrogen_track_positions, false, 1101 "track source code positions when building IR") 1102 1103 // 1104 // Disassembler only flags 1105 // 1106 #undef FLAG 1107 #ifdef ENABLE_DISASSEMBLER 1108 #define FLAG FLAG_FULL 1109 #else 1110 #define FLAG FLAG_READONLY 1111 #endif 1112 1113 // elements.cc 1114 DEFINE_BOOL(trace_elements_transitions, false, "trace elements transitions") 1115 1116 DEFINE_BOOL(trace_creation_allocation_sites, false, 1117 "trace the creation of allocation sites") 1118 1119 // code-stubs.cc 1120 DEFINE_BOOL(print_code_stubs, false, "print code stubs") 1121 DEFINE_BOOL(test_secondary_stub_cache, false, 1122 "test secondary stub cache by disabling the primary one") 1123 1124 DEFINE_BOOL(test_primary_stub_cache, false, 1125 "test primary stub cache by disabling the secondary one") 1126 1127 1128 // codegen-ia32.cc / codegen-arm.cc 1129 DEFINE_BOOL(print_code, false, "print generated code") 1130 DEFINE_BOOL(print_opt_code, false, "print optimized code") 1131 DEFINE_STRING(print_opt_code_filter, "*", "filter for printing optimized code") 1132 DEFINE_BOOL(print_unopt_code, false, 1133 "print unoptimized code before " 1134 "printing optimized code based on it") 1135 DEFINE_BOOL(print_code_verbose, false, "print more information for code") 1136 DEFINE_BOOL(print_builtin_code, false, "print generated code for builtins") 1137 1138 #ifdef ENABLE_DISASSEMBLER 1139 DEFINE_BOOL(sodium, false, 1140 "print generated code output suitable for use with " 1141 "the Sodium code viewer") 1142 1143 DEFINE_IMPLICATION(sodium, print_code_stubs) 1144 DEFINE_IMPLICATION(sodium, print_code) 1145 DEFINE_IMPLICATION(sodium, print_opt_code) 1146 DEFINE_IMPLICATION(sodium, hydrogen_track_positions) 1147 DEFINE_IMPLICATION(sodium, code_comments) 1148 1149 DEFINE_BOOL(print_all_code, false, "enable all flags related to printing code") 1150 DEFINE_IMPLICATION(print_all_code, print_code) 1151 DEFINE_IMPLICATION(print_all_code, print_opt_code) 1152 DEFINE_IMPLICATION(print_all_code, print_unopt_code) 1153 DEFINE_IMPLICATION(print_all_code, print_code_verbose) 1154 DEFINE_IMPLICATION(print_all_code, print_builtin_code) 1155 DEFINE_IMPLICATION(print_all_code, print_code_stubs) 1156 DEFINE_IMPLICATION(print_all_code, code_comments) 1157 #ifdef DEBUG 1158 DEFINE_IMPLICATION(print_all_code, trace_codegen) 1159 #endif 1160 #endif 1161 1162 #undef FLAG 1163 #define FLAG FLAG_FULL 1164 1165 // 1166 // Predictable mode related flags. 1167 // 1168 1169 DEFINE_BOOL(predictable, false, "enable predictable mode") 1170 DEFINE_IMPLICATION(predictable, single_threaded) 1171 DEFINE_NEG_IMPLICATION(predictable, memory_reducer) 1172 1173 // 1174 // Threading related flags. 1175 // 1176 1177 DEFINE_BOOL(single_threaded, false, "disable the use of background tasks") 1178 DEFINE_NEG_IMPLICATION(single_threaded, concurrent_recompilation) 1179 DEFINE_NEG_IMPLICATION(single_threaded, concurrent_sweeping) 1180 DEFINE_NEG_IMPLICATION(single_threaded, parallel_compaction) 1181 1182 1183 #undef FLAG 1184 1185 #ifdef VERIFY_PREDICTABLE 1186 #define FLAG FLAG_FULL 1187 #else 1188 #define FLAG FLAG_READONLY 1189 #endif 1190 1191 DEFINE_BOOL(verify_predictable, false, 1192 "this mode is used for checking that V8 behaves predictably") 1193 DEFINE_INT(dump_allocations_digest_at_alloc, -1, 1194 "dump allocations digest each n-th allocation") 1195 1196 // 1197 // Read-only flags 1198 // 1199 #undef FLAG 1200 #define FLAG FLAG_READONLY 1201 1202 // assembler.h 1203 DEFINE_BOOL(enable_embedded_constant_pool, V8_EMBEDDED_CONSTANT_POOL, 1204 "enable use of embedded constant pools (ARM/PPC only)") 1205 1206 DEFINE_BOOL(unbox_double_fields, V8_DOUBLE_FIELDS_UNBOXING, 1207 "enable in-object double fields unboxing (64-bit only)") 1208 DEFINE_IMPLICATION(unbox_double_fields, track_double_fields) 1209 1210 // Cleanup... 1211 #undef FLAG_FULL 1212 #undef FLAG_READONLY 1213 #undef FLAG 1214 #undef FLAG_ALIAS 1215 1216 #undef DEFINE_BOOL 1217 #undef DEFINE_MAYBE_BOOL 1218 #undef DEFINE_INT 1219 #undef DEFINE_STRING 1220 #undef DEFINE_FLOAT 1221 #undef DEFINE_ARGS 1222 #undef DEFINE_IMPLICATION 1223 #undef DEFINE_NEG_IMPLICATION 1224 #undef DEFINE_NEG_VALUE_IMPLICATION 1225 #undef DEFINE_VALUE_IMPLICATION 1226 #undef DEFINE_ALIAS_BOOL 1227 #undef DEFINE_ALIAS_INT 1228 #undef DEFINE_ALIAS_STRING 1229 #undef DEFINE_ALIAS_FLOAT 1230 #undef DEFINE_ALIAS_ARGS 1231 1232 #undef FLAG_MODE_DECLARE 1233 #undef FLAG_MODE_DEFINE 1234 #undef FLAG_MODE_DEFINE_DEFAULTS 1235 #undef FLAG_MODE_META 1236 #undef FLAG_MODE_DEFINE_IMPLICATIONS 1237 1238 #undef COMMA 1239
