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